2007-06-12 17:07:21 +04:00
/*
2008-09-29 23:18:18 +04:00
* Copyright ( C ) 2007 , 2008 Oracle . All rights reserved .
2007-06-12 17:07:21 +04:00
*
* This program is free software ; you can redistribute it and / or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation .
*
* This program is distributed in the hope that it will be useful ,
* but WITHOUT ANY WARRANTY ; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE . See the GNU
* General Public License for more details .
*
* You should have received a copy of the GNU General Public
* License along with this program ; if not , write to the
* Free Software Foundation , Inc . , 59 Temple Place - Suite 330 ,
* Boston , MA 021110 - 1307 , USA .
*/
2007-10-16 00:22:39 +04:00
# include <linux/sched.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 11:04:11 +03:00
# include <linux/slab.h>
2007-02-02 17:18:22 +03:00
# include "ctree.h"
# include "disk-io.h"
2007-03-23 22:56:19 +03:00
# include "transaction.h"
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# include "print-tree.h"
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# include "locking.h"
2007-02-23 16:38:36 +03:00
2007-03-16 23:20:31 +03:00
static int split_node ( struct btrfs_trans_handle * trans , struct btrfs_root
* root , struct btrfs_path * path , int level ) ;
static int split_leaf ( struct btrfs_trans_handle * trans , struct btrfs_root
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* root , struct btrfs_key * ins_key ,
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struct btrfs_path * path , int data_size , int extend ) ;
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static int push_node_left ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root , struct extent_buffer * dst ,
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struct extent_buffer * src , int empty ) ;
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static int balance_node_right ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct extent_buffer * dst_buf ,
struct extent_buffer * src_buf ) ;
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static int del_ptr ( struct btrfs_trans_handle * trans , struct btrfs_root * root ,
struct btrfs_path * path , int level , int slot ) ;
2007-02-21 00:40:44 +03:00
2007-04-04 17:36:31 +04:00
struct btrfs_path * btrfs_alloc_path ( void )
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{
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struct btrfs_path * path ;
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path = kmem_cache_zalloc ( btrfs_path_cachep , GFP_NOFS ) ;
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return path ;
2007-04-02 18:50:19 +04:00
}
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
/*
* set all locked nodes in the path to blocking locks . This should
* be done before scheduling
*/
noinline void btrfs_set_path_blocking ( struct btrfs_path * p )
{
int i ;
for ( i = 0 ; i < BTRFS_MAX_LEVEL ; i + + ) {
if ( p - > nodes [ i ] & & p - > locks [ i ] )
btrfs_set_lock_blocking ( p - > nodes [ i ] ) ;
}
}
/*
* reset all the locked nodes in the patch to spinning locks .
2009-02-12 22:09:45 +03:00
*
* held is used to keep lockdep happy , when lockdep is enabled
* we set held to a blocking lock before we go around and
* retake all the spinlocks in the path . You can safely use NULL
* for held
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
*/
2009-02-12 22:09:45 +03:00
noinline void btrfs_clear_path_blocking ( struct btrfs_path * p ,
struct extent_buffer * held )
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
{
int i ;
2009-02-12 22:09:45 +03:00
# ifdef CONFIG_DEBUG_LOCK_ALLOC
/* lockdep really cares that we take all of these spinlocks
* in the right order . If any of the locks in the path are not
* currently blocking , it is going to complain . So , make really
* really sure by forcing the path to blocking before we clear
* the path blocking .
*/
if ( held )
btrfs_set_lock_blocking ( held ) ;
btrfs_set_path_blocking ( p ) ;
# endif
for ( i = BTRFS_MAX_LEVEL - 1 ; i > = 0 ; i - - ) {
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
if ( p - > nodes [ i ] & & p - > locks [ i ] )
btrfs_clear_lock_blocking ( p - > nodes [ i ] ) ;
}
2009-02-12 22:09:45 +03:00
# ifdef CONFIG_DEBUG_LOCK_ALLOC
if ( held )
btrfs_clear_lock_blocking ( held ) ;
# endif
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
}
2008-09-29 23:18:18 +04:00
/* this also releases the path */
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void btrfs_free_path ( struct btrfs_path * p )
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{
2010-12-26 00:22:30 +03:00
if ( ! p )
return ;
2011-04-21 03:20:15 +04:00
btrfs_release_path ( p ) ;
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kmem_cache_free ( btrfs_path_cachep , p ) ;
2007-01-26 23:51:26 +03:00
}
2008-09-29 23:18:18 +04:00
/*
* path release drops references on the extent buffers in the path
* and it drops any locks held by this path
*
* It is safe to call this on paths that no locks or extent buffers held .
*/
2011-04-21 03:20:15 +04:00
noinline void btrfs_release_path ( struct btrfs_path * p )
2007-02-02 17:18:22 +03:00
{
int i ;
2008-06-26 00:01:30 +04:00
2007-03-13 17:46:10 +03:00
for ( i = 0 ; i < BTRFS_MAX_LEVEL ; i + + ) {
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p - > slots [ i ] = 0 ;
2007-02-02 17:18:22 +03:00
if ( ! p - > nodes [ i ] )
2008-06-26 00:01:30 +04:00
continue ;
if ( p - > locks [ i ] ) {
btrfs_tree_unlock ( p - > nodes [ i ] ) ;
p - > locks [ i ] = 0 ;
}
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free_extent_buffer ( p - > nodes [ i ] ) ;
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p - > nodes [ i ] = NULL ;
2007-02-02 17:18:22 +03:00
}
}
2008-09-29 23:18:18 +04:00
/*
* safely gets a reference on the root node of a tree . A lock
* is not taken , so a concurrent writer may put a different node
* at the root of the tree . See btrfs_lock_root_node for the
* looping required .
*
* The extent buffer returned by this has a reference taken , so
* it won ' t disappear . It may stop being the root of the tree
* at any time because there are no locks held .
*/
2008-06-26 00:01:30 +04:00
struct extent_buffer * btrfs_root_node ( struct btrfs_root * root )
{
struct extent_buffer * eb ;
2011-03-23 21:54:42 +03:00
rcu_read_lock ( ) ;
eb = rcu_dereference ( root - > node ) ;
2008-06-26 00:01:30 +04:00
extent_buffer_get ( eb ) ;
2011-03-23 21:54:42 +03:00
rcu_read_unlock ( ) ;
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return eb ;
}
2008-09-29 23:18:18 +04:00
/* loop around taking references on and locking the root node of the
* tree until you end up with a lock on the root . A locked buffer
* is returned , with a reference held .
*/
2008-06-26 00:01:30 +04:00
struct extent_buffer * btrfs_lock_root_node ( struct btrfs_root * root )
{
struct extent_buffer * eb ;
2009-01-06 05:25:51 +03:00
while ( 1 ) {
2008-06-26 00:01:30 +04:00
eb = btrfs_root_node ( root ) ;
btrfs_tree_lock ( eb ) ;
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if ( eb = = root - > node )
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break ;
btrfs_tree_unlock ( eb ) ;
free_extent_buffer ( eb ) ;
}
return eb ;
}
2008-09-29 23:18:18 +04:00
/* cowonly root (everything not a reference counted cow subvolume), just get
* put onto a simple dirty list . transaction . c walks this to make sure they
* get properly updated on disk .
*/
2008-03-24 22:01:56 +03:00
static void add_root_to_dirty_list ( struct btrfs_root * root )
{
if ( root - > track_dirty & & list_empty ( & root - > dirty_list ) ) {
list_add ( & root - > dirty_list ,
& root - > fs_info - > dirty_cowonly_roots ) ;
}
}
2008-09-29 23:18:18 +04:00
/*
* used by snapshot creation to make a copy of a root for a tree with
* a given objectid . The buffer with the new root node is returned in
* cow_ret , and this func returns zero on success or a negative error code .
*/
2007-12-18 04:14:01 +03:00
int btrfs_copy_root ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct extent_buffer * buf ,
struct extent_buffer * * cow_ret , u64 new_root_objectid )
{
struct extent_buffer * cow ;
int ret = 0 ;
int level ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
struct btrfs_disk_key disk_key ;
2007-12-18 04:14:01 +03:00
WARN_ON ( root - > ref_cows & & trans - > transid ! =
root - > fs_info - > running_transaction - > transid ) ;
WARN_ON ( root - > ref_cows & & trans - > transid ! = root - > last_trans ) ;
level = btrfs_header_level ( buf ) ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
if ( level = = 0 )
btrfs_item_key ( buf , & disk_key , 0 ) ;
else
btrfs_node_key ( buf , & disk_key , 0 ) ;
2008-09-23 21:14:14 +04:00
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
cow = btrfs_alloc_free_block ( trans , root , buf - > len , 0 ,
new_root_objectid , & disk_key , level ,
buf - > start , 0 ) ;
if ( IS_ERR ( cow ) )
2007-12-18 04:14:01 +03:00
return PTR_ERR ( cow ) ;
copy_extent_buffer ( cow , buf , 0 , 0 , cow - > len ) ;
btrfs_set_header_bytenr ( cow , cow - > start ) ;
btrfs_set_header_generation ( cow , trans - > transid ) ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
btrfs_set_header_backref_rev ( cow , BTRFS_MIXED_BACKREF_REV ) ;
btrfs_clear_header_flag ( cow , BTRFS_HEADER_FLAG_WRITTEN |
BTRFS_HEADER_FLAG_RELOC ) ;
if ( new_root_objectid = = BTRFS_TREE_RELOC_OBJECTID )
btrfs_set_header_flag ( cow , BTRFS_HEADER_FLAG_RELOC ) ;
else
btrfs_set_header_owner ( cow , new_root_objectid ) ;
2007-12-18 04:14:01 +03:00
2008-11-18 05:11:30 +03:00
write_extent_buffer ( cow , root - > fs_info - > fsid ,
( unsigned long ) btrfs_header_fsid ( cow ) ,
BTRFS_FSID_SIZE ) ;
2007-12-18 04:14:01 +03:00
WARN_ON ( btrfs_header_generation ( buf ) > trans - > transid ) ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
if ( new_root_objectid = = BTRFS_TREE_RELOC_OBJECTID )
ret = btrfs_inc_ref ( trans , root , cow , 1 ) ;
else
ret = btrfs_inc_ref ( trans , root , cow , 0 ) ;
2007-12-19 00:25:45 +03:00
2007-12-18 04:14:01 +03:00
if ( ret )
return ret ;
btrfs_mark_buffer_dirty ( cow ) ;
* cow_ret = cow ;
return 0 ;
}
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
/*
* check if the tree block can be shared by multiple trees
*/
int btrfs_block_can_be_shared ( struct btrfs_root * root ,
struct extent_buffer * buf )
{
/*
* Tree blocks not in refernece counted trees and tree roots
* are never shared . If a block was allocated after the last
* snapshot and the block was not allocated by tree relocation ,
* we know the block is not shared .
*/
if ( root - > ref_cows & &
buf ! = root - > node & & buf ! = root - > commit_root & &
( btrfs_header_generation ( buf ) < =
btrfs_root_last_snapshot ( & root - > root_item ) | |
btrfs_header_flag ( buf , BTRFS_HEADER_FLAG_RELOC ) ) )
return 1 ;
# ifdef BTRFS_COMPAT_EXTENT_TREE_V0
if ( root - > ref_cows & &
btrfs_header_backref_rev ( buf ) < BTRFS_MIXED_BACKREF_REV )
return 1 ;
# endif
return 0 ;
}
static noinline int update_ref_for_cow ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct extent_buffer * buf ,
2010-05-16 18:46:25 +04:00
struct extent_buffer * cow ,
int * last_ref )
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
{
u64 refs ;
u64 owner ;
u64 flags ;
u64 new_flags = 0 ;
int ret ;
/*
* Backrefs update rules :
*
* Always use full backrefs for extent pointers in tree block
* allocated by tree relocation .
*
* If a shared tree block is no longer referenced by its owner
* tree ( btrfs_header_owner ( buf ) = = root - > root_key . objectid ) ,
* use full backrefs for extent pointers in tree block .
*
* If a tree block is been relocating
* ( root - > root_key . objectid = = BTRFS_TREE_RELOC_OBJECTID ) ,
* use full backrefs for extent pointers in tree block .
* The reason for this is some operations ( such as drop tree )
* are only allowed for blocks use full backrefs .
*/
if ( btrfs_block_can_be_shared ( root , buf ) ) {
ret = btrfs_lookup_extent_info ( trans , root , buf - > start ,
buf - > len , & refs , & flags ) ;
BUG_ON ( ret ) ;
BUG_ON ( refs = = 0 ) ;
} else {
refs = 1 ;
if ( root - > root_key . objectid = = BTRFS_TREE_RELOC_OBJECTID | |
btrfs_header_backref_rev ( buf ) < BTRFS_MIXED_BACKREF_REV )
flags = BTRFS_BLOCK_FLAG_FULL_BACKREF ;
else
flags = 0 ;
}
owner = btrfs_header_owner ( buf ) ;
BUG_ON ( owner = = BTRFS_TREE_RELOC_OBJECTID & &
! ( flags & BTRFS_BLOCK_FLAG_FULL_BACKREF ) ) ;
if ( refs > 1 ) {
if ( ( owner = = root - > root_key . objectid | |
root - > root_key . objectid = = BTRFS_TREE_RELOC_OBJECTID ) & &
! ( flags & BTRFS_BLOCK_FLAG_FULL_BACKREF ) ) {
ret = btrfs_inc_ref ( trans , root , buf , 1 ) ;
BUG_ON ( ret ) ;
if ( root - > root_key . objectid = =
BTRFS_TREE_RELOC_OBJECTID ) {
ret = btrfs_dec_ref ( trans , root , buf , 0 ) ;
BUG_ON ( ret ) ;
ret = btrfs_inc_ref ( trans , root , cow , 1 ) ;
BUG_ON ( ret ) ;
}
new_flags | = BTRFS_BLOCK_FLAG_FULL_BACKREF ;
} else {
if ( root - > root_key . objectid = =
BTRFS_TREE_RELOC_OBJECTID )
ret = btrfs_inc_ref ( trans , root , cow , 1 ) ;
else
ret = btrfs_inc_ref ( trans , root , cow , 0 ) ;
BUG_ON ( ret ) ;
}
if ( new_flags ! = 0 ) {
ret = btrfs_set_disk_extent_flags ( trans , root ,
buf - > start ,
buf - > len ,
new_flags , 0 ) ;
BUG_ON ( ret ) ;
}
} else {
if ( flags & BTRFS_BLOCK_FLAG_FULL_BACKREF ) {
if ( root - > root_key . objectid = =
BTRFS_TREE_RELOC_OBJECTID )
ret = btrfs_inc_ref ( trans , root , cow , 1 ) ;
else
ret = btrfs_inc_ref ( trans , root , cow , 0 ) ;
BUG_ON ( ret ) ;
ret = btrfs_dec_ref ( trans , root , buf , 1 ) ;
BUG_ON ( ret ) ;
}
clean_tree_block ( trans , root , buf ) ;
2010-05-16 18:46:25 +04:00
* last_ref = 1 ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
}
return 0 ;
}
2008-09-29 23:18:18 +04:00
/*
2009-01-06 05:25:51 +03:00
* does the dirty work in cow of a single block . The parent block ( if
* supplied ) is updated to point to the new cow copy . The new buffer is marked
* dirty and returned locked . If you modify the block it needs to be marked
* dirty again .
2008-09-29 23:18:18 +04:00
*
* search_start - - an allocation hint for the new block
*
2009-01-06 05:25:51 +03:00
* empty_size - - a hint that you plan on doing more cow . This is the size in
* bytes the allocator should try to find free next to the block it returns .
* This is just a hint and may be ignored by the allocator .
2008-09-29 23:18:18 +04:00
*/
2009-01-06 05:25:51 +03:00
static noinline int __btrfs_cow_block ( struct btrfs_trans_handle * trans ,
2007-10-16 00:14:19 +04:00
struct btrfs_root * root ,
struct extent_buffer * buf ,
struct extent_buffer * parent , int parent_slot ,
struct extent_buffer * * cow_ret ,
2009-03-13 17:24:59 +03:00
u64 search_start , u64 empty_size )
2007-03-03 00:08:05 +03:00
{
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
struct btrfs_disk_key disk_key ;
2007-10-16 00:14:19 +04:00
struct extent_buffer * cow ;
2007-12-11 17:25:06 +03:00
int level ;
2010-05-16 18:46:25 +04:00
int last_ref = 0 ;
2008-06-26 00:01:30 +04:00
int unlock_orig = 0 ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
u64 parent_start ;
2007-12-11 17:25:06 +03:00
2008-06-26 00:01:30 +04:00
if ( * cow_ret = = buf )
unlock_orig = 1 ;
2009-03-09 18:45:38 +03:00
btrfs_assert_tree_locked ( buf ) ;
2008-06-26 00:01:30 +04:00
2007-12-11 17:25:06 +03:00
WARN_ON ( root - > ref_cows & & trans - > transid ! =
root - > fs_info - > running_transaction - > transid ) ;
2007-08-08 00:15:09 +04:00
WARN_ON ( root - > ref_cows & & trans - > transid ! = root - > last_trans ) ;
2007-10-16 00:14:19 +04:00
2007-12-11 17:25:06 +03:00
level = btrfs_header_level ( buf ) ;
2008-09-23 21:14:14 +04:00
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
if ( level = = 0 )
btrfs_item_key ( buf , & disk_key , 0 ) ;
else
btrfs_node_key ( buf , & disk_key , 0 ) ;
if ( root - > root_key . objectid = = BTRFS_TREE_RELOC_OBJECTID ) {
if ( parent )
parent_start = parent - > start ;
else
parent_start = 0 ;
} else
parent_start = 0 ;
cow = btrfs_alloc_free_block ( trans , root , buf - > len , parent_start ,
root - > root_key . objectid , & disk_key ,
level , search_start , empty_size ) ;
2007-06-22 22:16:25 +04:00
if ( IS_ERR ( cow ) )
return PTR_ERR ( cow ) ;
2007-08-08 00:15:09 +04:00
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
/* cow is set to blocking by btrfs_init_new_buffer */
2007-10-16 00:14:19 +04:00
copy_extent_buffer ( cow , buf , 0 , 0 , cow - > len ) ;
2007-10-16 00:15:53 +04:00
btrfs_set_header_bytenr ( cow , cow - > start ) ;
2007-10-16 00:14:19 +04:00
btrfs_set_header_generation ( cow , trans - > transid ) ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
btrfs_set_header_backref_rev ( cow , BTRFS_MIXED_BACKREF_REV ) ;
btrfs_clear_header_flag ( cow , BTRFS_HEADER_FLAG_WRITTEN |
BTRFS_HEADER_FLAG_RELOC ) ;
if ( root - > root_key . objectid = = BTRFS_TREE_RELOC_OBJECTID )
btrfs_set_header_flag ( cow , BTRFS_HEADER_FLAG_RELOC ) ;
else
btrfs_set_header_owner ( cow , root - > root_key . objectid ) ;
2007-08-08 00:15:09 +04:00
2008-11-18 05:11:30 +03:00
write_extent_buffer ( cow , root - > fs_info - > fsid ,
( unsigned long ) btrfs_header_fsid ( cow ) ,
BTRFS_FSID_SIZE ) ;
2010-05-16 18:46:25 +04:00
update_ref_for_cow ( trans , root , buf , cow , & last_ref ) ;
Btrfs: update space balancing code
This patch updates the space balancing code to utilize the new
backref format. Before, btrfs-vol -b would break any COW links
on data blocks or metadata. This was slow and caused the amount
of space used to explode if a large number of snapshots were present.
The new code can keeps the sharing of all data extents and
most of the tree blocks.
To maintain the sharing of data extents, the space balance code uses
a seperate inode hold data extent pointers, then updates the references
to point to the new location.
To maintain the sharing of tree blocks, the space balance code uses
reloc trees to relocate tree blocks in reference counted roots.
There is one reloc tree for each subvol, and all reloc trees share
same root key objectid. Reloc trees are snapshots of the latest
committed roots of subvols (root->commit_root).
To relocate a tree block referenced by a subvol, there are two steps.
COW the block through subvol's reloc tree, then update block pointer in
the subvol to point to the new block. Since all reloc trees share
same root key objectid, doing special handing for tree blocks
owned by them is easy. Once a tree block has been COWed in one
reloc tree, we can use the resulting new block directly when the
same block is required to COW again through other reloc trees.
In this way, relocated tree blocks are shared between reloc trees,
so they are also shared between subvols.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-26 18:09:34 +04:00
2010-05-16 18:49:59 +04:00
if ( root - > ref_cows )
btrfs_reloc_cow_block ( trans , root , buf , cow ) ;
2007-03-03 00:08:05 +03:00
if ( buf = = root - > node ) {
2008-06-26 00:01:30 +04:00
WARN_ON ( parent & & parent ! = buf ) ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
if ( root - > root_key . objectid = = BTRFS_TREE_RELOC_OBJECTID | |
btrfs_header_backref_rev ( buf ) < BTRFS_MIXED_BACKREF_REV )
parent_start = buf - > start ;
else
parent_start = 0 ;
2008-06-26 00:01:30 +04:00
2007-10-16 00:14:19 +04:00
extent_buffer_get ( cow ) ;
2011-03-23 21:54:42 +03:00
rcu_assign_pointer ( root - > node , cow ) ;
2008-06-26 00:01:30 +04:00
2010-05-16 18:46:25 +04:00
btrfs_free_tree_block ( trans , root , buf , parent_start ,
last_ref ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( buf ) ;
2008-03-24 22:01:56 +03:00
add_root_to_dirty_list ( root ) ;
2007-03-03 00:08:05 +03:00
} else {
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
if ( root - > root_key . objectid = = BTRFS_TREE_RELOC_OBJECTID )
parent_start = parent - > start ;
else
parent_start = 0 ;
WARN_ON ( trans - > transid ! = btrfs_header_generation ( parent ) ) ;
2007-10-16 00:14:19 +04:00
btrfs_set_node_blockptr ( parent , parent_slot ,
2007-10-16 00:15:53 +04:00
cow - > start ) ;
2007-12-11 17:25:06 +03:00
btrfs_set_node_ptr_generation ( parent , parent_slot ,
trans - > transid ) ;
2007-03-30 22:27:56 +04:00
btrfs_mark_buffer_dirty ( parent ) ;
2010-05-16 18:46:25 +04:00
btrfs_free_tree_block ( trans , root , buf , parent_start ,
last_ref ) ;
2007-03-03 00:08:05 +03:00
}
2008-06-26 00:01:30 +04:00
if ( unlock_orig )
btrfs_tree_unlock ( buf ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( buf ) ;
2007-06-28 23:57:36 +04:00
btrfs_mark_buffer_dirty ( cow ) ;
2007-04-02 18:50:19 +04:00
* cow_ret = cow ;
2007-03-03 00:08:05 +03:00
return 0 ;
}
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
static inline int should_cow_block ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct extent_buffer * buf )
{
if ( btrfs_header_generation ( buf ) = = trans - > transid & &
! btrfs_header_flag ( buf , BTRFS_HEADER_FLAG_WRITTEN ) & &
! ( root - > root_key . objectid ! = BTRFS_TREE_RELOC_OBJECTID & &
btrfs_header_flag ( buf , BTRFS_HEADER_FLAG_RELOC ) ) )
return 0 ;
return 1 ;
}
2008-09-29 23:18:18 +04:00
/*
* cows a single block , see __btrfs_cow_block for the real work .
* This version of it has extra checks so that a block isn ' t cow ' d more than
* once per transaction , as long as it hasn ' t been written yet
*/
2009-01-06 05:25:51 +03:00
noinline int btrfs_cow_block ( struct btrfs_trans_handle * trans ,
2007-10-16 00:14:19 +04:00
struct btrfs_root * root , struct extent_buffer * buf ,
struct extent_buffer * parent , int parent_slot ,
2009-03-13 17:24:59 +03:00
struct extent_buffer * * cow_ret )
2007-08-08 00:15:09 +04:00
{
u64 search_start ;
2007-10-16 00:14:48 +04:00
int ret ;
2008-01-08 23:46:30 +03:00
2007-08-08 00:15:09 +04:00
if ( trans - > transaction ! = root - > fs_info - > running_transaction ) {
2009-01-06 05:25:51 +03:00
printk ( KERN_CRIT " trans %llu running %llu \n " ,
( unsigned long long ) trans - > transid ,
( unsigned long long )
2007-08-08 00:15:09 +04:00
root - > fs_info - > running_transaction - > transid ) ;
WARN_ON ( 1 ) ;
}
if ( trans - > transid ! = root - > fs_info - > generation ) {
2009-01-06 05:25:51 +03:00
printk ( KERN_CRIT " trans %llu running %llu \n " ,
( unsigned long long ) trans - > transid ,
( unsigned long long ) root - > fs_info - > generation ) ;
2007-08-08 00:15:09 +04:00
WARN_ON ( 1 ) ;
}
2008-01-08 23:46:30 +03:00
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
if ( ! should_cow_block ( trans , root , buf ) ) {
2007-08-08 00:15:09 +04:00
* cow_ret = buf ;
return 0 ;
}
2009-02-04 17:24:25 +03:00
2008-03-24 22:01:56 +03:00
search_start = buf - > start & ~ ( ( u64 ) ( 1024 * 1024 * 1024 ) - 1 ) ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
if ( parent )
btrfs_set_lock_blocking ( parent ) ;
btrfs_set_lock_blocking ( buf ) ;
2007-10-16 00:14:48 +04:00
ret = __btrfs_cow_block ( trans , root , buf , parent ,
2009-03-13 17:24:59 +03:00
parent_slot , cow_ret , search_start , 0 ) ;
Btrfs: add initial tracepoint support for btrfs
Tracepoints can provide insight into why btrfs hits bugs and be greatly
helpful for debugging, e.g
dd-7822 [000] 2121.641088: btrfs_inode_request: root = 5(FS_TREE), gen = 4, ino = 256, blocks = 8, disk_i_size = 0, last_trans = 8, logged_trans = 0
dd-7822 [000] 2121.641100: btrfs_inode_new: root = 5(FS_TREE), gen = 8, ino = 257, blocks = 0, disk_i_size = 0, last_trans = 0, logged_trans = 0
btrfs-transacti-7804 [001] 2146.935420: btrfs_cow_block: root = 2(EXTENT_TREE), refs = 2, orig_buf = 29368320 (orig_level = 0), cow_buf = 29388800 (cow_level = 0)
btrfs-transacti-7804 [001] 2146.935473: btrfs_cow_block: root = 1(ROOT_TREE), refs = 2, orig_buf = 29364224 (orig_level = 0), cow_buf = 29392896 (cow_level = 0)
btrfs-transacti-7804 [001] 2146.972221: btrfs_transaction_commit: root = 1(ROOT_TREE), gen = 8
flush-btrfs-2-7821 [001] 2155.824210: btrfs_chunk_alloc: root = 3(CHUNK_TREE), offset = 1103101952, size = 1073741824, num_stripes = 1, sub_stripes = 0, type = DATA
flush-btrfs-2-7821 [001] 2155.824241: btrfs_cow_block: root = 2(EXTENT_TREE), refs = 2, orig_buf = 29388800 (orig_level = 0), cow_buf = 29396992 (cow_level = 0)
flush-btrfs-2-7821 [001] 2155.824255: btrfs_cow_block: root = 4(DEV_TREE), refs = 2, orig_buf = 29372416 (orig_level = 0), cow_buf = 29401088 (cow_level = 0)
flush-btrfs-2-7821 [000] 2155.824329: btrfs_cow_block: root = 3(CHUNK_TREE), refs = 2, orig_buf = 20971520 (orig_level = 0), cow_buf = 20975616 (cow_level = 0)
btrfs-endio-wri-7800 [001] 2155.898019: btrfs_cow_block: root = 5(FS_TREE), refs = 2, orig_buf = 29384704 (orig_level = 0), cow_buf = 29405184 (cow_level = 0)
btrfs-endio-wri-7800 [001] 2155.898043: btrfs_cow_block: root = 7(CSUM_TREE), refs = 2, orig_buf = 29376512 (orig_level = 0), cow_buf = 29409280 (cow_level = 0)
Here is what I have added:
1) ordere_extent:
btrfs_ordered_extent_add
btrfs_ordered_extent_remove
btrfs_ordered_extent_start
btrfs_ordered_extent_put
These provide critical information to understand how ordered_extents are
updated.
2) extent_map:
btrfs_get_extent
extent_map is used in both read and write cases, and it is useful for tracking
how btrfs specific IO is running.
3) writepage:
__extent_writepage
btrfs_writepage_end_io_hook
Pages are cirtical resourses and produce a lot of corner cases during writeback,
so it is valuable to know how page is written to disk.
4) inode:
btrfs_inode_new
btrfs_inode_request
btrfs_inode_evict
These can show where and when a inode is created, when a inode is evicted.
5) sync:
btrfs_sync_file
btrfs_sync_fs
These show sync arguments.
6) transaction:
btrfs_transaction_commit
In transaction based filesystem, it will be useful to know the generation and
who does commit.
7) back reference and cow:
btrfs_delayed_tree_ref
btrfs_delayed_data_ref
btrfs_delayed_ref_head
btrfs_cow_block
Btrfs natively supports back references, these tracepoints are helpful on
understanding btrfs's COW mechanism.
8) chunk:
btrfs_chunk_alloc
btrfs_chunk_free
Chunk is a link between physical offset and logical offset, and stands for space
infomation in btrfs, and these are helpful on tracing space things.
9) reserved_extent:
btrfs_reserved_extent_alloc
btrfs_reserved_extent_free
These can show how btrfs uses its space.
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2011-03-24 14:18:59 +03:00
trace_btrfs_cow_block ( root , buf , * cow_ret ) ;
2007-10-16 00:14:48 +04:00
return ret ;
2007-08-08 00:15:09 +04:00
}
2008-09-29 23:18:18 +04:00
/*
* helper function for defrag to decide if two blocks pointed to by a
* node are actually close by
*/
2007-10-16 00:17:34 +04:00
static int close_blocks ( u64 blocknr , u64 other , u32 blocksize )
2007-08-08 00:15:09 +04:00
{
2007-10-16 00:17:34 +04:00
if ( blocknr < other & & other - ( blocknr + blocksize ) < 32768 )
2007-08-08 00:15:09 +04:00
return 1 ;
2007-10-16 00:17:34 +04:00
if ( blocknr > other & & blocknr - ( other + blocksize ) < 32768 )
2007-08-08 00:15:09 +04:00
return 1 ;
return 0 ;
}
2007-11-06 18:26:24 +03:00
/*
* compare two keys in a memcmp fashion
*/
static int comp_keys ( struct btrfs_disk_key * disk , struct btrfs_key * k2 )
{
struct btrfs_key k1 ;
btrfs_disk_key_to_cpu ( & k1 , disk ) ;
2009-07-24 19:06:52 +04:00
return btrfs_comp_cpu_keys ( & k1 , k2 ) ;
2007-11-06 18:26:24 +03:00
}
2008-11-12 22:19:50 +03:00
/*
* same as comp_keys only with two btrfs_key ' s
*/
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
int btrfs_comp_cpu_keys ( struct btrfs_key * k1 , struct btrfs_key * k2 )
2008-11-12 22:19:50 +03:00
{
if ( k1 - > objectid > k2 - > objectid )
return 1 ;
if ( k1 - > objectid < k2 - > objectid )
return - 1 ;
if ( k1 - > type > k2 - > type )
return 1 ;
if ( k1 - > type < k2 - > type )
return - 1 ;
if ( k1 - > offset > k2 - > offset )
return 1 ;
if ( k1 - > offset < k2 - > offset )
return - 1 ;
return 0 ;
}
2007-11-06 18:26:24 +03:00
2008-09-29 23:18:18 +04:00
/*
* this is used by the defrag code to go through all the
* leaves pointed to by a node and reallocate them so that
* disk order is close to key order
*/
2007-08-08 00:15:09 +04:00
int btrfs_realloc_node ( struct btrfs_trans_handle * trans ,
2007-10-16 00:14:19 +04:00
struct btrfs_root * root , struct extent_buffer * parent ,
2007-10-16 00:22:39 +04:00
int start_slot , int cache_only , u64 * last_ret ,
struct btrfs_key * progress )
2007-08-08 00:15:09 +04:00
{
2007-10-16 00:17:34 +04:00
struct extent_buffer * cur ;
2007-08-08 00:15:09 +04:00
u64 blocknr ;
2008-05-12 20:59:19 +04:00
u64 gen ;
2007-08-10 22:06:19 +04:00
u64 search_start = * last_ret ;
u64 last_block = 0 ;
2007-08-08 00:15:09 +04:00
u64 other ;
u32 parent_nritems ;
int end_slot ;
int i ;
int err = 0 ;
2007-08-10 22:42:37 +04:00
int parent_level ;
2007-10-16 00:17:34 +04:00
int uptodate ;
u32 blocksize ;
2007-11-06 18:26:24 +03:00
int progress_passed = 0 ;
struct btrfs_disk_key disk_key ;
2007-08-08 00:15:09 +04:00
2007-10-25 23:43:18 +04:00
parent_level = btrfs_header_level ( parent ) ;
if ( cache_only & & parent_level ! = 1 )
return 0 ;
2009-01-06 05:25:51 +03:00
if ( trans - > transaction ! = root - > fs_info - > running_transaction )
2007-08-08 00:15:09 +04:00
WARN_ON ( 1 ) ;
2009-01-06 05:25:51 +03:00
if ( trans - > transid ! = root - > fs_info - > generation )
2007-08-08 00:15:09 +04:00
WARN_ON ( 1 ) ;
2007-09-11 03:58:16 +04:00
2007-10-16 00:17:34 +04:00
parent_nritems = btrfs_header_nritems ( parent ) ;
blocksize = btrfs_level_size ( root , parent_level - 1 ) ;
2007-08-08 00:15:09 +04:00
end_slot = parent_nritems ;
if ( parent_nritems = = 1 )
return 0 ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
btrfs_set_lock_blocking ( parent ) ;
2007-08-08 00:15:09 +04:00
for ( i = start_slot ; i < end_slot ; i + + ) {
int close = 1 ;
2007-10-16 00:22:39 +04:00
2007-10-25 23:43:18 +04:00
if ( ! parent - > map_token ) {
map_extent_buffer ( parent ,
btrfs_node_key_ptr_offset ( i ) ,
sizeof ( struct btrfs_key_ptr ) ,
& parent - > map_token , & parent - > kaddr ,
& parent - > map_start , & parent - > map_len ,
KM_USER1 ) ;
}
2007-11-06 18:26:24 +03:00
btrfs_node_key ( parent , & disk_key , i ) ;
if ( ! progress_passed & & comp_keys ( & disk_key , progress ) < 0 )
continue ;
progress_passed = 1 ;
2007-10-16 00:17:34 +04:00
blocknr = btrfs_node_blockptr ( parent , i ) ;
2008-05-12 20:59:19 +04:00
gen = btrfs_node_ptr_generation ( parent , i ) ;
2007-08-10 22:06:19 +04:00
if ( last_block = = 0 )
last_block = blocknr ;
2007-10-25 23:43:18 +04:00
2007-08-08 00:15:09 +04:00
if ( i > 0 ) {
2007-10-16 00:17:34 +04:00
other = btrfs_node_blockptr ( parent , i - 1 ) ;
close = close_blocks ( blocknr , other , blocksize ) ;
2007-08-08 00:15:09 +04:00
}
2008-05-24 22:04:53 +04:00
if ( ! close & & i < end_slot - 2 ) {
2007-10-16 00:17:34 +04:00
other = btrfs_node_blockptr ( parent , i + 1 ) ;
close = close_blocks ( blocknr , other , blocksize ) ;
2007-08-08 00:15:09 +04:00
}
2007-08-10 22:06:19 +04:00
if ( close ) {
last_block = blocknr ;
2007-08-08 00:15:09 +04:00
continue ;
2007-08-10 22:06:19 +04:00
}
2007-10-25 23:43:18 +04:00
if ( parent - > map_token ) {
unmap_extent_buffer ( parent , parent - > map_token ,
KM_USER1 ) ;
parent - > map_token = NULL ;
}
2007-08-08 00:15:09 +04:00
2007-10-16 00:17:34 +04:00
cur = btrfs_find_tree_block ( root , blocknr , blocksize ) ;
if ( cur )
2008-05-12 21:39:03 +04:00
uptodate = btrfs_buffer_uptodate ( cur , gen ) ;
2007-10-16 00:17:34 +04:00
else
uptodate = 0 ;
2007-10-25 23:43:18 +04:00
if ( ! cur | | ! uptodate ) {
2007-08-08 00:15:09 +04:00
if ( cache_only ) {
2007-10-16 00:17:34 +04:00
free_extent_buffer ( cur ) ;
2007-08-08 00:15:09 +04:00
continue ;
}
2007-10-16 00:17:34 +04:00
if ( ! cur ) {
cur = read_tree_block ( root , blocknr ,
2008-05-12 20:59:19 +04:00
blocksize , gen ) ;
2011-03-24 09:33:21 +03:00
if ( ! cur )
return - EIO ;
2007-10-16 00:17:34 +04:00
} else if ( ! uptodate ) {
2008-05-12 20:59:19 +04:00
btrfs_read_buffer ( cur , gen ) ;
2007-08-10 22:42:37 +04:00
}
2007-08-08 00:15:09 +04:00
}
2007-08-10 22:06:19 +04:00
if ( search_start = = 0 )
2007-10-16 00:17:34 +04:00
search_start = last_block ;
2007-08-10 22:06:19 +04:00
2008-06-26 00:01:31 +04:00
btrfs_tree_lock ( cur ) ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
btrfs_set_lock_blocking ( cur ) ;
2007-10-16 00:17:34 +04:00
err = __btrfs_cow_block ( trans , root , cur , parent , i ,
2008-06-26 00:01:31 +04:00
& cur , search_start ,
2007-10-16 00:17:34 +04:00
min ( 16 * blocksize ,
2009-03-13 17:24:59 +03:00
( end_slot - i ) * blocksize ) ) ;
2007-08-29 17:11:44 +04:00
if ( err ) {
2008-06-26 00:01:31 +04:00
btrfs_tree_unlock ( cur ) ;
2007-10-16 00:17:34 +04:00
free_extent_buffer ( cur ) ;
2007-08-08 00:15:09 +04:00
break ;
2007-08-29 17:11:44 +04:00
}
2008-06-26 00:01:31 +04:00
search_start = cur - > start ;
last_block = cur - > start ;
2007-08-10 22:42:37 +04:00
* last_ret = search_start ;
2008-06-26 00:01:31 +04:00
btrfs_tree_unlock ( cur ) ;
free_extent_buffer ( cur ) ;
2007-08-08 00:15:09 +04:00
}
2007-10-25 23:43:18 +04:00
if ( parent - > map_token ) {
unmap_extent_buffer ( parent , parent - > map_token ,
KM_USER1 ) ;
parent - > map_token = NULL ;
}
2007-08-08 00:15:09 +04:00
return err ;
}
2007-02-02 19:05:29 +03:00
/*
* The leaf data grows from end - to - front in the node .
* this returns the address of the start of the last item ,
* which is the stop of the leaf data stack
*/
2007-03-14 21:14:43 +03:00
static inline unsigned int leaf_data_end ( struct btrfs_root * root ,
2007-10-16 00:14:19 +04:00
struct extent_buffer * leaf )
2007-01-26 23:51:26 +03:00
{
2007-10-16 00:14:19 +04:00
u32 nr = btrfs_header_nritems ( leaf ) ;
2007-01-26 23:51:26 +03:00
if ( nr = = 0 )
2007-03-14 21:14:43 +03:00
return BTRFS_LEAF_DATA_SIZE ( root ) ;
2007-10-16 00:14:19 +04:00
return btrfs_item_offset_nr ( leaf , nr - 1 ) ;
2007-01-26 23:51:26 +03:00
}
2007-03-01 00:35:06 +03:00
2007-02-02 19:05:29 +03:00
/*
2007-10-16 00:14:19 +04:00
* search for key in the extent_buffer . The items start at offset p ,
* and they are item_size apart . There are ' max ' items in p .
*
2007-02-02 19:05:29 +03:00
* the slot in the array is returned via slot , and it points to
* the place where you would insert key if it is not found in
* the array .
*
* slot may point to max if the key is bigger than all of the keys
*/
2008-09-06 00:13:11 +04:00
static noinline int generic_bin_search ( struct extent_buffer * eb ,
unsigned long p ,
int item_size , struct btrfs_key * key ,
int max , int * slot )
2007-01-26 23:51:26 +03:00
{
int low = 0 ;
int high = max ;
int mid ;
int ret ;
2007-10-16 00:14:27 +04:00
struct btrfs_disk_key * tmp = NULL ;
2007-10-16 00:14:19 +04:00
struct btrfs_disk_key unaligned ;
unsigned long offset ;
char * map_token = NULL ;
char * kaddr = NULL ;
unsigned long map_start = 0 ;
unsigned long map_len = 0 ;
2007-10-16 00:14:27 +04:00
int err ;
2007-01-26 23:51:26 +03:00
2009-01-06 05:25:51 +03:00
while ( low < high ) {
2007-01-26 23:51:26 +03:00
mid = ( low + high ) / 2 ;
2007-10-16 00:14:19 +04:00
offset = p + mid * item_size ;
if ( ! map_token | | offset < map_start | |
( offset + sizeof ( struct btrfs_disk_key ) ) >
map_start + map_len ) {
2007-10-16 00:14:27 +04:00
if ( map_token ) {
2007-10-16 00:14:19 +04:00
unmap_extent_buffer ( eb , map_token , KM_USER0 ) ;
2007-10-16 00:14:27 +04:00
map_token = NULL ;
}
2008-12-09 00:43:10 +03:00
err = map_private_extent_buffer ( eb , offset ,
2007-10-16 00:14:27 +04:00
sizeof ( struct btrfs_disk_key ) ,
& map_token , & kaddr ,
& map_start , & map_len , KM_USER0 ) ;
if ( ! err ) {
tmp = ( struct btrfs_disk_key * ) ( kaddr + offset -
map_start ) ;
} else {
read_extent_buffer ( eb , & unaligned ,
offset , sizeof ( unaligned ) ) ;
tmp = & unaligned ;
}
2007-10-16 00:14:19 +04:00
} else {
tmp = ( struct btrfs_disk_key * ) ( kaddr + offset -
map_start ) ;
}
2007-01-26 23:51:26 +03:00
ret = comp_keys ( tmp , key ) ;
if ( ret < 0 )
low = mid + 1 ;
else if ( ret > 0 )
high = mid ;
else {
* slot = mid ;
2007-10-16 00:14:27 +04:00
if ( map_token )
unmap_extent_buffer ( eb , map_token , KM_USER0 ) ;
2007-01-26 23:51:26 +03:00
return 0 ;
}
}
* slot = low ;
2007-10-16 00:14:19 +04:00
if ( map_token )
unmap_extent_buffer ( eb , map_token , KM_USER0 ) ;
2007-01-26 23:51:26 +03:00
return 1 ;
}
2007-02-24 21:39:08 +03:00
/*
* simple bin_search frontend that does the right thing for
* leaves vs nodes
*/
2007-10-16 00:14:19 +04:00
static int bin_search ( struct extent_buffer * eb , struct btrfs_key * key ,
int level , int * slot )
2007-01-26 23:51:26 +03:00
{
2007-10-16 00:14:19 +04:00
if ( level = = 0 ) {
return generic_bin_search ( eb ,
offsetof ( struct btrfs_leaf , items ) ,
2007-03-13 03:12:07 +03:00
sizeof ( struct btrfs_item ) ,
2007-10-16 00:14:19 +04:00
key , btrfs_header_nritems ( eb ) ,
2007-03-12 19:01:18 +03:00
slot ) ;
2007-01-26 23:51:26 +03:00
} else {
2007-10-16 00:14:19 +04:00
return generic_bin_search ( eb ,
offsetof ( struct btrfs_node , ptrs ) ,
2007-03-14 21:14:43 +03:00
sizeof ( struct btrfs_key_ptr ) ,
2007-10-16 00:14:19 +04:00
key , btrfs_header_nritems ( eb ) ,
2007-03-12 19:01:18 +03:00
slot ) ;
2007-01-26 23:51:26 +03:00
}
return - 1 ;
}
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
int btrfs_bin_search ( struct extent_buffer * eb , struct btrfs_key * key ,
int level , int * slot )
{
return bin_search ( eb , key , level , slot ) ;
}
2010-05-16 18:46:25 +04:00
static void root_add_used ( struct btrfs_root * root , u32 size )
{
spin_lock ( & root - > accounting_lock ) ;
btrfs_set_root_used ( & root - > root_item ,
btrfs_root_used ( & root - > root_item ) + size ) ;
spin_unlock ( & root - > accounting_lock ) ;
}
static void root_sub_used ( struct btrfs_root * root , u32 size )
{
spin_lock ( & root - > accounting_lock ) ;
btrfs_set_root_used ( & root - > root_item ,
btrfs_root_used ( & root - > root_item ) - size ) ;
spin_unlock ( & root - > accounting_lock ) ;
}
2008-09-29 23:18:18 +04:00
/* given a node and slot number, this reads the blocks it points to. The
* extent buffer is returned with a reference taken ( but unlocked ) .
* NULL is returned on error .
*/
2008-09-06 00:13:11 +04:00
static noinline struct extent_buffer * read_node_slot ( struct btrfs_root * root ,
2007-10-16 00:14:19 +04:00
struct extent_buffer * parent , int slot )
2007-03-01 20:04:21 +03:00
{
2008-05-12 20:59:19 +04:00
int level = btrfs_header_level ( parent ) ;
2007-03-01 20:04:21 +03:00
if ( slot < 0 )
return NULL ;
2007-10-16 00:14:19 +04:00
if ( slot > = btrfs_header_nritems ( parent ) )
2007-03-01 20:04:21 +03:00
return NULL ;
2008-05-12 20:59:19 +04:00
BUG_ON ( level = = 0 ) ;
2007-10-16 00:15:53 +04:00
return read_tree_block ( root , btrfs_node_blockptr ( parent , slot ) ,
2008-05-12 20:59:19 +04:00
btrfs_level_size ( root , level - 1 ) ,
btrfs_node_ptr_generation ( parent , slot ) ) ;
2007-03-01 20:04:21 +03:00
}
2008-09-29 23:18:18 +04:00
/*
* node level balancing , used to make sure nodes are in proper order for
* item deletion . We balance from the top down , so we have to make sure
* that a deletion won ' t leave an node completely empty later on .
*/
2008-09-06 00:13:11 +04:00
static noinline int balance_level ( struct btrfs_trans_handle * trans ,
2008-01-03 18:01:48 +03:00
struct btrfs_root * root ,
struct btrfs_path * path , int level )
2007-03-01 20:04:21 +03:00
{
2007-10-16 00:14:19 +04:00
struct extent_buffer * right = NULL ;
struct extent_buffer * mid ;
struct extent_buffer * left = NULL ;
struct extent_buffer * parent = NULL ;
2007-03-01 20:04:21 +03:00
int ret = 0 ;
int wret ;
int pslot ;
int orig_slot = path - > slots [ level ] ;
2007-03-01 23:16:26 +03:00
u64 orig_ptr ;
2007-03-01 20:04:21 +03:00
if ( level = = 0 )
return 0 ;
2007-10-16 00:14:19 +04:00
mid = path - > nodes [ level ] ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
2008-06-26 00:01:30 +04:00
WARN_ON ( ! path - > locks [ level ] ) ;
2007-12-11 17:25:06 +03:00
WARN_ON ( btrfs_header_generation ( mid ) ! = trans - > transid ) ;
2007-03-13 16:28:32 +03:00
orig_ptr = btrfs_node_blockptr ( mid , orig_slot ) ;
2007-03-01 23:16:26 +03:00
2007-03-13 17:46:10 +03:00
if ( level < BTRFS_MAX_LEVEL - 1 )
2007-10-16 00:14:19 +04:00
parent = path - > nodes [ level + 1 ] ;
2007-03-01 20:04:21 +03:00
pslot = path - > slots [ level + 1 ] ;
2007-03-17 21:29:23 +03:00
/*
* deal with the case where there is only one pointer in the root
* by promoting the node below to a root
*/
2007-10-16 00:14:19 +04:00
if ( ! parent ) {
struct extent_buffer * child ;
2007-03-01 20:04:21 +03:00
2007-10-16 00:14:19 +04:00
if ( btrfs_header_nritems ( mid ) ! = 1 )
2007-03-01 20:04:21 +03:00
return 0 ;
/* promote the child to a root */
2007-10-16 00:14:19 +04:00
child = read_node_slot ( root , mid , 0 ) ;
2009-02-12 18:06:15 +03:00
BUG_ON ( ! child ) ;
2008-06-26 00:01:30 +04:00
btrfs_tree_lock ( child ) ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
btrfs_set_lock_blocking ( child ) ;
2009-03-13 17:24:59 +03:00
ret = btrfs_cow_block ( trans , root , child , mid , 0 , & child ) ;
2010-05-16 18:46:25 +04:00
if ( ret ) {
btrfs_tree_unlock ( child ) ;
free_extent_buffer ( child ) ;
goto enospc ;
}
2008-02-01 22:58:07 +03:00
2011-03-23 21:54:42 +03:00
rcu_assign_pointer ( root - > node , child ) ;
2008-06-26 00:01:30 +04:00
2008-03-24 22:01:56 +03:00
add_root_to_dirty_list ( root ) ;
2008-06-26 00:01:30 +04:00
btrfs_tree_unlock ( child ) ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
2008-06-26 00:01:30 +04:00
path - > locks [ level ] = 0 ;
2007-03-01 20:04:21 +03:00
path - > nodes [ level ] = NULL ;
2007-10-16 00:14:19 +04:00
clean_tree_block ( trans , root , mid ) ;
2008-06-26 00:01:30 +04:00
btrfs_tree_unlock ( mid ) ;
2007-03-01 20:04:21 +03:00
/* once for the path */
2007-10-16 00:14:19 +04:00
free_extent_buffer ( mid ) ;
2010-05-16 18:46:25 +04:00
root_sub_used ( root , mid - > len ) ;
btrfs_free_tree_block ( trans , root , mid , 0 , 1 ) ;
2007-03-01 20:04:21 +03:00
/* once for the root ptr */
2007-10-16 00:14:19 +04:00
free_extent_buffer ( mid ) ;
2010-05-16 18:46:25 +04:00
return 0 ;
2007-03-01 20:04:21 +03:00
}
2007-10-16 00:14:19 +04:00
if ( btrfs_header_nritems ( mid ) >
2007-03-14 21:14:43 +03:00
BTRFS_NODEPTRS_PER_BLOCK ( root ) / 4 )
2007-03-01 20:04:21 +03:00
return 0 ;
2010-10-29 23:14:37 +04:00
btrfs_header_nritems ( mid ) ;
2007-06-22 22:16:25 +04:00
2007-10-16 00:14:19 +04:00
left = read_node_slot ( root , parent , pslot - 1 ) ;
if ( left ) {
2008-06-26 00:01:30 +04:00
btrfs_tree_lock ( left ) ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
btrfs_set_lock_blocking ( left ) ;
2007-10-16 00:14:19 +04:00
wret = btrfs_cow_block ( trans , root , left ,
2009-03-13 17:24:59 +03:00
parent , pslot - 1 , & left ) ;
2007-06-22 22:16:25 +04:00
if ( wret ) {
ret = wret ;
goto enospc ;
}
2007-08-28 00:49:44 +04:00
}
2007-10-16 00:14:19 +04:00
right = read_node_slot ( root , parent , pslot + 1 ) ;
if ( right ) {
2008-06-26 00:01:30 +04:00
btrfs_tree_lock ( right ) ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
btrfs_set_lock_blocking ( right ) ;
2007-10-16 00:14:19 +04:00
wret = btrfs_cow_block ( trans , root , right ,
2009-03-13 17:24:59 +03:00
parent , pslot + 1 , & right ) ;
2007-08-28 00:49:44 +04:00
if ( wret ) {
ret = wret ;
goto enospc ;
}
}
/* first, try to make some room in the middle buffer */
2007-10-16 00:14:19 +04:00
if ( left ) {
orig_slot + = btrfs_header_nritems ( left ) ;
2008-04-24 22:42:46 +04:00
wret = push_node_left ( trans , root , left , mid , 1 ) ;
2007-03-01 23:16:26 +03:00
if ( wret < 0 )
ret = wret ;
2010-10-29 23:14:37 +04:00
btrfs_header_nritems ( mid ) ;
2007-03-01 20:04:21 +03:00
}
2007-03-01 23:16:26 +03:00
/*
* then try to empty the right most buffer into the middle
*/
2007-10-16 00:14:19 +04:00
if ( right ) {
2008-04-24 18:54:32 +04:00
wret = push_node_left ( trans , root , mid , right , 1 ) ;
2007-06-22 22:16:25 +04:00
if ( wret < 0 & & wret ! = - ENOSPC )
2007-03-01 23:16:26 +03:00
ret = wret ;
2007-10-16 00:14:19 +04:00
if ( btrfs_header_nritems ( right ) = = 0 ) {
clean_tree_block ( trans , root , right ) ;
2008-06-26 00:01:30 +04:00
btrfs_tree_unlock ( right ) ;
2007-03-16 23:20:31 +03:00
wret = del_ptr ( trans , root , path , level + 1 , pslot +
1 ) ;
2007-03-01 20:04:21 +03:00
if ( wret )
ret = wret ;
2010-05-16 18:46:25 +04:00
root_sub_used ( root , right - > len ) ;
btrfs_free_tree_block ( trans , root , right , 0 , 1 ) ;
free_extent_buffer ( right ) ;
right = NULL ;
2007-03-01 20:04:21 +03:00
} else {
2007-10-16 00:14:19 +04:00
struct btrfs_disk_key right_key ;
btrfs_node_key ( right , & right_key , 0 ) ;
btrfs_set_node_key ( parent , & right_key , pslot + 1 ) ;
btrfs_mark_buffer_dirty ( parent ) ;
2007-03-01 20:04:21 +03:00
}
}
2007-10-16 00:14:19 +04:00
if ( btrfs_header_nritems ( mid ) = = 1 ) {
2007-03-01 23:16:26 +03:00
/*
* we ' re not allowed to leave a node with one item in the
* tree during a delete . A deletion from lower in the tree
* could try to delete the only pointer in this node .
* So , pull some keys from the left .
* There has to be a left pointer at this point because
* otherwise we would have pulled some pointers from the
* right
*/
2007-10-16 00:14:19 +04:00
BUG_ON ( ! left ) ;
wret = balance_node_right ( trans , root , mid , left ) ;
2007-06-22 22:16:25 +04:00
if ( wret < 0 ) {
2007-03-01 23:16:26 +03:00
ret = wret ;
2007-06-22 22:16:25 +04:00
goto enospc ;
}
2008-04-24 22:42:46 +04:00
if ( wret = = 1 ) {
wret = push_node_left ( trans , root , left , mid , 1 ) ;
if ( wret < 0 )
ret = wret ;
}
2007-03-01 23:16:26 +03:00
BUG_ON ( wret = = 1 ) ;
}
2007-10-16 00:14:19 +04:00
if ( btrfs_header_nritems ( mid ) = = 0 ) {
clean_tree_block ( trans , root , mid ) ;
2008-06-26 00:01:30 +04:00
btrfs_tree_unlock ( mid ) ;
2007-03-16 23:20:31 +03:00
wret = del_ptr ( trans , root , path , level + 1 , pslot ) ;
2007-03-01 20:04:21 +03:00
if ( wret )
ret = wret ;
2010-05-16 18:46:25 +04:00
root_sub_used ( root , mid - > len ) ;
btrfs_free_tree_block ( trans , root , mid , 0 , 1 ) ;
free_extent_buffer ( mid ) ;
mid = NULL ;
2007-03-01 23:16:26 +03:00
} else {
/* update the parent key to reflect our changes */
2007-10-16 00:14:19 +04:00
struct btrfs_disk_key mid_key ;
btrfs_node_key ( mid , & mid_key , 0 ) ;
btrfs_set_node_key ( parent , & mid_key , pslot ) ;
btrfs_mark_buffer_dirty ( parent ) ;
2007-03-01 23:16:26 +03:00
}
2007-03-01 20:04:21 +03:00
2007-03-01 23:16:26 +03:00
/* update the path */
2007-10-16 00:14:19 +04:00
if ( left ) {
if ( btrfs_header_nritems ( left ) > orig_slot ) {
extent_buffer_get ( left ) ;
2008-06-26 00:01:30 +04:00
/* left was locked after cow */
2007-10-16 00:14:19 +04:00
path - > nodes [ level ] = left ;
2007-03-01 20:04:21 +03:00
path - > slots [ level + 1 ] - = 1 ;
path - > slots [ level ] = orig_slot ;
2008-06-26 00:01:30 +04:00
if ( mid ) {
btrfs_tree_unlock ( mid ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( mid ) ;
2008-06-26 00:01:30 +04:00
}
2007-03-01 20:04:21 +03:00
} else {
2007-10-16 00:14:19 +04:00
orig_slot - = btrfs_header_nritems ( left ) ;
2007-03-01 20:04:21 +03:00
path - > slots [ level ] = orig_slot ;
}
}
2007-03-01 23:16:26 +03:00
/* double check we haven't messed things up */
2007-03-22 19:13:20 +03:00
if ( orig_ptr ! =
2007-10-16 00:14:19 +04:00
btrfs_node_blockptr ( path - > nodes [ level ] , path - > slots [ level ] ) )
2007-03-01 23:16:26 +03:00
BUG ( ) ;
2007-06-22 22:16:25 +04:00
enospc :
2008-06-26 00:01:30 +04:00
if ( right ) {
btrfs_tree_unlock ( right ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( right ) ;
2008-06-26 00:01:30 +04:00
}
if ( left ) {
if ( path - > nodes [ level ] ! = left )
btrfs_tree_unlock ( left ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( left ) ;
2008-06-26 00:01:30 +04:00
}
2007-03-01 20:04:21 +03:00
return ret ;
}
2008-09-29 23:18:18 +04:00
/* Node balancing for insertion. Here we only split or push nodes around
* when they are completely full . This is also done top down , so we
* have to be pessimistic .
*/
2009-01-06 05:25:51 +03:00
static noinline int push_nodes_for_insert ( struct btrfs_trans_handle * trans ,
2008-01-03 18:01:48 +03:00
struct btrfs_root * root ,
struct btrfs_path * path , int level )
2007-04-20 21:16:02 +04:00
{
2007-10-16 00:14:19 +04:00
struct extent_buffer * right = NULL ;
struct extent_buffer * mid ;
struct extent_buffer * left = NULL ;
struct extent_buffer * parent = NULL ;
2007-04-20 21:16:02 +04:00
int ret = 0 ;
int wret ;
int pslot ;
int orig_slot = path - > slots [ level ] ;
if ( level = = 0 )
return 1 ;
2007-10-16 00:14:19 +04:00
mid = path - > nodes [ level ] ;
2007-12-11 17:25:06 +03:00
WARN_ON ( btrfs_header_generation ( mid ) ! = trans - > transid ) ;
2007-04-20 21:16:02 +04:00
if ( level < BTRFS_MAX_LEVEL - 1 )
2007-10-16 00:14:19 +04:00
parent = path - > nodes [ level + 1 ] ;
2007-04-20 21:16:02 +04:00
pslot = path - > slots [ level + 1 ] ;
2007-10-16 00:14:19 +04:00
if ( ! parent )
2007-04-20 21:16:02 +04:00
return 1 ;
2007-10-16 00:14:19 +04:00
left = read_node_slot ( root , parent , pslot - 1 ) ;
2007-04-20 21:16:02 +04:00
/* first, try to make some room in the middle buffer */
2007-10-16 00:14:19 +04:00
if ( left ) {
2007-04-20 21:16:02 +04:00
u32 left_nr ;
2008-06-26 00:01:30 +04:00
btrfs_tree_lock ( left ) ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
btrfs_set_lock_blocking ( left ) ;
2007-10-16 00:14:19 +04:00
left_nr = btrfs_header_nritems ( left ) ;
2007-04-20 21:48:57 +04:00
if ( left_nr > = BTRFS_NODEPTRS_PER_BLOCK ( root ) - 1 ) {
wret = 1 ;
} else {
2007-10-16 00:14:19 +04:00
ret = btrfs_cow_block ( trans , root , left , parent ,
2009-03-13 17:24:59 +03:00
pslot - 1 , & left ) ;
2007-06-22 22:16:25 +04:00
if ( ret )
wret = 1 ;
else {
wret = push_node_left ( trans , root ,
2008-04-24 18:54:32 +04:00
left , mid , 0 ) ;
2007-06-22 22:16:25 +04:00
}
2007-04-20 21:48:57 +04:00
}
2007-04-20 21:16:02 +04:00
if ( wret < 0 )
ret = wret ;
if ( wret = = 0 ) {
2007-10-16 00:14:19 +04:00
struct btrfs_disk_key disk_key ;
2007-04-20 21:16:02 +04:00
orig_slot + = left_nr ;
2007-10-16 00:14:19 +04:00
btrfs_node_key ( mid , & disk_key , 0 ) ;
btrfs_set_node_key ( parent , & disk_key , pslot ) ;
btrfs_mark_buffer_dirty ( parent ) ;
if ( btrfs_header_nritems ( left ) > orig_slot ) {
path - > nodes [ level ] = left ;
2007-04-20 21:16:02 +04:00
path - > slots [ level + 1 ] - = 1 ;
path - > slots [ level ] = orig_slot ;
2008-06-26 00:01:30 +04:00
btrfs_tree_unlock ( mid ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( mid ) ;
2007-04-20 21:16:02 +04:00
} else {
orig_slot - =
2007-10-16 00:14:19 +04:00
btrfs_header_nritems ( left ) ;
2007-04-20 21:16:02 +04:00
path - > slots [ level ] = orig_slot ;
2008-06-26 00:01:30 +04:00
btrfs_tree_unlock ( left ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( left ) ;
2007-04-20 21:16:02 +04:00
}
return 0 ;
}
2008-06-26 00:01:30 +04:00
btrfs_tree_unlock ( left ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( left ) ;
2007-04-20 21:16:02 +04:00
}
2008-06-26 00:01:30 +04:00
right = read_node_slot ( root , parent , pslot + 1 ) ;
2007-04-20 21:16:02 +04:00
/*
* then try to empty the right most buffer into the middle
*/
2007-10-16 00:14:19 +04:00
if ( right ) {
2007-04-20 21:48:57 +04:00
u32 right_nr ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
2008-06-26 00:01:30 +04:00
btrfs_tree_lock ( right ) ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
btrfs_set_lock_blocking ( right ) ;
2007-10-16 00:14:19 +04:00
right_nr = btrfs_header_nritems ( right ) ;
2007-04-20 21:48:57 +04:00
if ( right_nr > = BTRFS_NODEPTRS_PER_BLOCK ( root ) - 1 ) {
wret = 1 ;
} else {
2007-10-16 00:14:19 +04:00
ret = btrfs_cow_block ( trans , root , right ,
parent , pslot + 1 ,
2009-03-13 17:24:59 +03:00
& right ) ;
2007-06-22 22:16:25 +04:00
if ( ret )
wret = 1 ;
else {
wret = balance_node_right ( trans , root ,
2007-10-16 00:14:19 +04:00
right , mid ) ;
2007-06-22 22:16:25 +04:00
}
2007-04-20 21:48:57 +04:00
}
2007-04-20 21:16:02 +04:00
if ( wret < 0 )
ret = wret ;
if ( wret = = 0 ) {
2007-10-16 00:14:19 +04:00
struct btrfs_disk_key disk_key ;
btrfs_node_key ( right , & disk_key , 0 ) ;
btrfs_set_node_key ( parent , & disk_key , pslot + 1 ) ;
btrfs_mark_buffer_dirty ( parent ) ;
if ( btrfs_header_nritems ( mid ) < = orig_slot ) {
path - > nodes [ level ] = right ;
2007-04-20 21:16:02 +04:00
path - > slots [ level + 1 ] + = 1 ;
path - > slots [ level ] = orig_slot -
2007-10-16 00:14:19 +04:00
btrfs_header_nritems ( mid ) ;
2008-06-26 00:01:30 +04:00
btrfs_tree_unlock ( mid ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( mid ) ;
2007-04-20 21:16:02 +04:00
} else {
2008-06-26 00:01:30 +04:00
btrfs_tree_unlock ( right ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( right ) ;
2007-04-20 21:16:02 +04:00
}
return 0 ;
}
2008-06-26 00:01:30 +04:00
btrfs_tree_unlock ( right ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( right ) ;
2007-04-20 21:16:02 +04:00
}
return 1 ;
}
2007-08-07 23:52:22 +04:00
/*
2008-09-29 23:18:18 +04:00
* readahead one full node of leaves , finding things that are close
* to the block in ' slot ' , and triggering ra on them .
2007-08-07 23:52:22 +04:00
*/
2009-04-03 18:14:18 +04:00
static void reada_for_search ( struct btrfs_root * root ,
struct btrfs_path * path ,
int level , int slot , u64 objectid )
2007-08-07 23:52:22 +04:00
{
2007-10-16 00:14:19 +04:00
struct extent_buffer * node ;
2007-12-22 00:24:26 +03:00
struct btrfs_disk_key disk_key ;
2007-08-07 23:52:22 +04:00
u32 nritems ;
u64 search ;
2009-01-22 17:23:10 +03:00
u64 target ;
2007-10-16 00:17:34 +04:00
u64 nread = 0 ;
2011-05-11 20:17:34 +04:00
u64 gen ;
2007-08-07 23:52:22 +04:00
int direction = path - > reada ;
2007-10-16 00:14:19 +04:00
struct extent_buffer * eb ;
2007-10-16 00:17:34 +04:00
u32 nr ;
u32 blocksize ;
u32 nscan = 0 ;
2011-06-08 22:36:54 +04:00
bool map = true ;
2007-10-16 00:15:53 +04:00
2007-10-16 00:22:39 +04:00
if ( level ! = 1 )
2007-08-08 00:15:09 +04:00
return ;
if ( ! path - > nodes [ level ] )
2007-08-07 23:52:22 +04:00
return ;
2007-10-16 00:14:19 +04:00
node = path - > nodes [ level ] ;
2008-06-26 00:01:30 +04:00
2007-08-07 23:52:22 +04:00
search = btrfs_node_blockptr ( node , slot ) ;
2007-10-16 00:17:34 +04:00
blocksize = btrfs_level_size ( root , level - 1 ) ;
eb = btrfs_find_tree_block ( root , search , blocksize ) ;
2007-10-16 00:14:19 +04:00
if ( eb ) {
free_extent_buffer ( eb ) ;
2007-08-07 23:52:22 +04:00
return ;
}
2009-01-22 17:23:10 +03:00
target = search ;
2007-10-16 00:17:34 +04:00
2007-10-16 00:14:19 +04:00
nritems = btrfs_header_nritems ( node ) ;
2007-10-16 00:17:34 +04:00
nr = slot ;
2011-06-08 22:36:54 +04:00
if ( node - > map_token | | path - > skip_locking )
map = false ;
2009-01-06 05:25:51 +03:00
while ( 1 ) {
2011-06-08 22:36:54 +04:00
if ( map & & ! node - > map_token ) {
2011-05-11 20:17:34 +04:00
unsigned long offset = btrfs_node_key_ptr_offset ( nr ) ;
map_private_extent_buffer ( node , offset ,
sizeof ( struct btrfs_key_ptr ) ,
& node - > map_token ,
& node - > kaddr ,
& node - > map_start ,
& node - > map_len , KM_USER1 ) ;
}
2007-10-16 00:17:34 +04:00
if ( direction < 0 ) {
if ( nr = = 0 )
break ;
nr - - ;
} else if ( direction > 0 ) {
nr + + ;
if ( nr > = nritems )
break ;
2007-08-07 23:52:22 +04:00
}
2007-12-22 00:24:26 +03:00
if ( path - > reada < 0 & & objectid ) {
btrfs_node_key ( node , & disk_key , nr ) ;
if ( btrfs_disk_key_objectid ( & disk_key ) ! = objectid )
break ;
}
2007-10-16 00:17:34 +04:00
search = btrfs_node_blockptr ( node , nr ) ;
2009-01-22 17:23:10 +03:00
if ( ( search < = target & & target - search < = 65536 ) | |
( search > target & & search - target < = 65536 ) ) {
2011-05-11 20:17:34 +04:00
gen = btrfs_node_ptr_generation ( node , nr ) ;
2011-06-08 22:36:54 +04:00
if ( map & & node - > map_token ) {
2011-05-11 20:17:34 +04:00
unmap_extent_buffer ( node , node - > map_token ,
KM_USER1 ) ;
node - > map_token = NULL ;
}
readahead_tree_block ( root , search , blocksize , gen ) ;
2007-10-16 00:17:34 +04:00
nread + = blocksize ;
}
nscan + + ;
2009-01-22 17:23:10 +03:00
if ( ( nread > 65536 | | nscan > 32 ) )
2007-10-16 00:17:34 +04:00
break ;
2007-08-07 23:52:22 +04:00
}
2011-06-08 22:36:54 +04:00
if ( map & & node - > map_token ) {
2011-05-11 20:17:34 +04:00
unmap_extent_buffer ( node , node - > map_token , KM_USER1 ) ;
node - > map_token = NULL ;
}
2007-08-07 23:52:22 +04:00
}
2008-06-26 00:01:30 +04:00
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
/*
* returns - EAGAIN if it had to drop the path , or zero if everything was in
* cache
*/
static noinline int reada_for_balance ( struct btrfs_root * root ,
struct btrfs_path * path , int level )
{
int slot ;
int nritems ;
struct extent_buffer * parent ;
struct extent_buffer * eb ;
u64 gen ;
u64 block1 = 0 ;
u64 block2 = 0 ;
int ret = 0 ;
int blocksize ;
2009-04-20 23:50:10 +04:00
parent = path - > nodes [ level + 1 ] ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
if ( ! parent )
return 0 ;
nritems = btrfs_header_nritems ( parent ) ;
2009-04-20 23:50:10 +04:00
slot = path - > slots [ level + 1 ] ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
blocksize = btrfs_level_size ( root , level ) ;
if ( slot > 0 ) {
block1 = btrfs_node_blockptr ( parent , slot - 1 ) ;
gen = btrfs_node_ptr_generation ( parent , slot - 1 ) ;
eb = btrfs_find_tree_block ( root , block1 , blocksize ) ;
if ( eb & & btrfs_buffer_uptodate ( eb , gen ) )
block1 = 0 ;
free_extent_buffer ( eb ) ;
}
2009-04-20 23:50:10 +04:00
if ( slot + 1 < nritems ) {
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
block2 = btrfs_node_blockptr ( parent , slot + 1 ) ;
gen = btrfs_node_ptr_generation ( parent , slot + 1 ) ;
eb = btrfs_find_tree_block ( root , block2 , blocksize ) ;
if ( eb & & btrfs_buffer_uptodate ( eb , gen ) )
block2 = 0 ;
free_extent_buffer ( eb ) ;
}
if ( block1 | | block2 ) {
ret = - EAGAIN ;
2009-04-20 23:50:10 +04:00
/* release the whole path */
2011-04-21 03:20:15 +04:00
btrfs_release_path ( path ) ;
2009-04-20 23:50:10 +04:00
/* read the blocks */
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
if ( block1 )
readahead_tree_block ( root , block1 , blocksize , 0 ) ;
if ( block2 )
readahead_tree_block ( root , block2 , blocksize , 0 ) ;
if ( block1 ) {
eb = read_tree_block ( root , block1 , blocksize , 0 ) ;
free_extent_buffer ( eb ) ;
}
2009-04-20 23:50:10 +04:00
if ( block2 ) {
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
eb = read_tree_block ( root , block2 , blocksize , 0 ) ;
free_extent_buffer ( eb ) ;
}
}
return ret ;
}
2008-09-29 23:18:18 +04:00
/*
2009-01-06 05:25:51 +03:00
* when we walk down the tree , it is usually safe to unlock the higher layers
* in the tree . The exceptions are when our path goes through slot 0 , because
* operations on the tree might require changing key pointers higher up in the
* tree .
2008-09-29 23:18:18 +04:00
*
2009-01-06 05:25:51 +03:00
* callers might also have set path - > keep_locks , which tells this code to keep
* the lock if the path points to the last slot in the block . This is part of
* walking through the tree , and selecting the next slot in the higher block .
2008-09-29 23:18:18 +04:00
*
2009-01-06 05:25:51 +03:00
* lowest_unlock sets the lowest level in the tree we ' re allowed to unlock . so
* if lowest_unlock is 1 , level 0 won ' t be unlocked
2008-09-29 23:18:18 +04:00
*/
2008-09-06 00:13:11 +04:00
static noinline void unlock_up ( struct btrfs_path * path , int level ,
int lowest_unlock )
2008-06-26 00:01:30 +04:00
{
int i ;
int skip_level = level ;
2008-06-26 00:01:30 +04:00
int no_skips = 0 ;
2008-06-26 00:01:30 +04:00
struct extent_buffer * t ;
for ( i = level ; i < BTRFS_MAX_LEVEL ; i + + ) {
if ( ! path - > nodes [ i ] )
break ;
if ( ! path - > locks [ i ] )
break ;
2008-06-26 00:01:30 +04:00
if ( ! no_skips & & path - > slots [ i ] = = 0 ) {
2008-06-26 00:01:30 +04:00
skip_level = i + 1 ;
continue ;
}
2008-06-26 00:01:30 +04:00
if ( ! no_skips & & path - > keep_locks ) {
2008-06-26 00:01:30 +04:00
u32 nritems ;
t = path - > nodes [ i ] ;
nritems = btrfs_header_nritems ( t ) ;
2008-06-26 00:01:30 +04:00
if ( nritems < 1 | | path - > slots [ i ] > = nritems - 1 ) {
2008-06-26 00:01:30 +04:00
skip_level = i + 1 ;
continue ;
}
}
2008-06-26 00:01:30 +04:00
if ( skip_level < i & & i > = lowest_unlock )
no_skips = 1 ;
2008-06-26 00:01:30 +04:00
t = path - > nodes [ i ] ;
if ( i > = lowest_unlock & & i > skip_level & & path - > locks [ i ] ) {
btrfs_tree_unlock ( t ) ;
path - > locks [ i ] = 0 ;
}
}
}
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
/*
* This releases any locks held in the path starting at level and
* going all the way up to the root .
*
* btrfs_search_slot will keep the lock held on higher nodes in a few
* corner cases , such as COW of the block at slot zero in the node . This
* ignores those rules , and it should only be called when there are no
* more updates to be done higher up in the tree .
*/
noinline void btrfs_unlock_up_safe ( struct btrfs_path * path , int level )
{
int i ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
if ( path - > keep_locks )
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
return ;
for ( i = level ; i < BTRFS_MAX_LEVEL ; i + + ) {
if ( ! path - > nodes [ i ] )
2009-02-04 17:31:42 +03:00
continue ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
if ( ! path - > locks [ i ] )
2009-02-04 17:31:42 +03:00
continue ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
btrfs_tree_unlock ( path - > nodes [ i ] ) ;
path - > locks [ i ] = 0 ;
}
}
2009-04-03 18:14:18 +04:00
/*
* helper function for btrfs_search_slot . The goal is to find a block
* in cache without setting the path to blocking . If we find the block
* we return zero and the path is unchanged .
*
* If we can ' t find the block , we set the path blocking and do some
* reada . - EAGAIN is returned and the search must be repeated .
*/
static int
read_block_for_search ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root , struct btrfs_path * p ,
struct extent_buffer * * eb_ret , int level , int slot ,
struct btrfs_key * key )
{
u64 blocknr ;
u64 gen ;
u32 blocksize ;
struct extent_buffer * b = * eb_ret ;
struct extent_buffer * tmp ;
2009-05-14 21:24:30 +04:00
int ret ;
2009-04-03 18:14:18 +04:00
blocknr = btrfs_node_blockptr ( b , slot ) ;
gen = btrfs_node_ptr_generation ( b , slot ) ;
blocksize = btrfs_level_size ( root , level - 1 ) ;
tmp = btrfs_find_tree_block ( root , blocknr , blocksize ) ;
2010-10-24 19:01:27 +04:00
if ( tmp ) {
if ( btrfs_buffer_uptodate ( tmp , 0 ) ) {
if ( btrfs_buffer_uptodate ( tmp , gen ) ) {
/*
* we found an up to date block without
* sleeping , return
* right away
*/
* eb_ret = tmp ;
return 0 ;
}
/* the pages were up to date, but we failed
* the generation number check . Do a full
* read for the generation number that is correct .
* We must do this without dropping locks so
* we can trust our generation number
*/
free_extent_buffer ( tmp ) ;
tmp = read_tree_block ( root , blocknr , blocksize , gen ) ;
if ( tmp & & btrfs_buffer_uptodate ( tmp , gen ) ) {
* eb_ret = tmp ;
return 0 ;
}
free_extent_buffer ( tmp ) ;
2011-04-21 03:20:15 +04:00
btrfs_release_path ( p ) ;
2010-10-24 19:01:27 +04:00
return - EIO ;
}
2009-04-03 18:14:18 +04:00
}
/*
* reduce lock contention at high levels
* of the btree by dropping locks before
2009-05-14 21:24:30 +04:00
* we read . Don ' t release the lock on the current
* level because we need to walk this node to figure
* out which blocks to read .
2009-04-03 18:14:18 +04:00
*/
2009-04-20 23:50:10 +04:00
btrfs_unlock_up_safe ( p , level + 1 ) ;
btrfs_set_path_blocking ( p ) ;
2010-10-24 19:01:27 +04:00
free_extent_buffer ( tmp ) ;
2009-04-03 18:14:18 +04:00
if ( p - > reada )
reada_for_search ( root , p , level , slot , key - > objectid ) ;
2011-04-21 03:20:15 +04:00
btrfs_release_path ( p ) ;
2009-05-14 21:24:30 +04:00
ret = - EAGAIN ;
2010-05-26 19:20:30 +04:00
tmp = read_tree_block ( root , blocknr , blocksize , 0 ) ;
2009-05-14 21:24:30 +04:00
if ( tmp ) {
/*
* If the read above didn ' t mark this buffer up to date ,
* it will never end up being up to date . Set ret to EIO now
* and give up so that our caller doesn ' t loop forever
* on our EAGAINs .
*/
if ( ! btrfs_buffer_uptodate ( tmp , 0 ) )
ret = - EIO ;
2009-04-03 18:14:18 +04:00
free_extent_buffer ( tmp ) ;
2009-05-14 21:24:30 +04:00
}
return ret ;
2009-04-03 18:14:18 +04:00
}
/*
* helper function for btrfs_search_slot . This does all of the checks
* for node - level blocks and does any balancing required based on
* the ins_len .
*
* If no extra work was required , zero is returned . If we had to
* drop the path , - EAGAIN is returned and btrfs_search_slot must
* start over
*/
static int
setup_nodes_for_search ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root , struct btrfs_path * p ,
struct extent_buffer * b , int level , int ins_len )
{
int ret ;
if ( ( p - > search_for_split | | ins_len > 0 ) & & btrfs_header_nritems ( b ) > =
BTRFS_NODEPTRS_PER_BLOCK ( root ) - 3 ) {
int sret ;
sret = reada_for_balance ( root , p , level ) ;
if ( sret )
goto again ;
btrfs_set_path_blocking ( p ) ;
sret = split_node ( trans , root , p , level ) ;
btrfs_clear_path_blocking ( p , NULL ) ;
BUG_ON ( sret > 0 ) ;
if ( sret ) {
ret = sret ;
goto done ;
}
b = p - > nodes [ level ] ;
} else if ( ins_len < 0 & & btrfs_header_nritems ( b ) <
2009-05-18 18:41:58 +04:00
BTRFS_NODEPTRS_PER_BLOCK ( root ) / 2 ) {
2009-04-03 18:14:18 +04:00
int sret ;
sret = reada_for_balance ( root , p , level ) ;
if ( sret )
goto again ;
btrfs_set_path_blocking ( p ) ;
sret = balance_level ( trans , root , p , level ) ;
btrfs_clear_path_blocking ( p , NULL ) ;
if ( sret ) {
ret = sret ;
goto done ;
}
b = p - > nodes [ level ] ;
if ( ! b ) {
2011-04-21 03:20:15 +04:00
btrfs_release_path ( p ) ;
2009-04-03 18:14:18 +04:00
goto again ;
}
BUG_ON ( btrfs_header_nritems ( b ) = = 1 ) ;
}
return 0 ;
again :
ret = - EAGAIN ;
done :
return ret ;
}
2007-02-02 19:05:29 +03:00
/*
* look for key in the tree . path is filled in with nodes along the way
* if key is found , we return zero and you can find the item in the leaf
* level of the path ( level 0 )
*
* If the key isn ' t found , the path points to the slot where it should
2007-03-01 00:35:06 +03:00
* be inserted , and 1 is returned . If there are other errors during the
* search a negative error number is returned .
2007-02-24 21:39:08 +03:00
*
* if ins_len > 0 , nodes and leaves will be split as we walk down the
* tree . if ins_len < 0 , nodes will be merged as we walk down the tree ( if
* possible )
2007-02-02 19:05:29 +03:00
*/
2007-03-16 23:20:31 +03:00
int btrfs_search_slot ( struct btrfs_trans_handle * trans , struct btrfs_root
* root , struct btrfs_key * key , struct btrfs_path * p , int
ins_len , int cow )
2007-01-26 23:51:26 +03:00
{
2007-10-16 00:14:19 +04:00
struct extent_buffer * b ;
2007-01-26 23:51:26 +03:00
int slot ;
int ret ;
2009-07-22 17:59:00 +04:00
int err ;
2007-01-26 23:51:26 +03:00
int level ;
2008-06-26 00:01:30 +04:00
int lowest_unlock = 1 ;
2007-08-07 23:52:19 +04:00
u8 lowest_level = 0 ;
2007-08-08 00:15:09 +04:00
lowest_level = p - > lowest_level ;
2008-10-02 03:05:46 +04:00
WARN_ON ( lowest_level & & ins_len > 0 ) ;
2007-03-30 16:47:31 +04:00
WARN_ON ( p - > nodes [ 0 ] ! = NULL ) ;
Btrfs: nuke fs wide allocation mutex V2
This patch removes the giant fs_info->alloc_mutex and replaces it with a bunch
of little locks.
There is now a pinned_mutex, which is used when messing with the pinned_extents
extent io tree, and the extent_ins_mutex which is used with the pending_del and
extent_ins extent io trees.
The locking for the extent tree stuff was inspired by a patch that Yan Zheng
wrote to fix a race condition, I cleaned it up some and changed the locking
around a little bit, but the idea remains the same. Basically instead of
holding the extent_ins_mutex throughout the processing of an extent on the
extent_ins or pending_del trees, we just hold it while we're searching and when
we clear the bits on those trees, and lock the extent for the duration of the
operations on the extent.
Also to keep from getting hung up waiting to lock an extent, I've added a
try_lock_extent so if we cannot lock the extent, move on to the next one in the
tree and we'll come back to that one. I have tested this heavily and it does
not appear to break anything. This has to be applied on top of my
find_free_extent redo patch.
I tested this patch on top of Yan's space reblancing code and it worked fine.
The only thing that has changed since the last version is I pulled out all my
debugging stuff, apparently I forgot to run guilt refresh before I sent the
last patch out. Thank you,
Signed-off-by: Josef Bacik <jbacik@redhat.com>
2008-10-29 21:49:05 +03:00
2008-06-26 00:01:30 +04:00
if ( ins_len < 0 )
lowest_unlock = 2 ;
2008-08-01 23:11:20 +04:00
2007-03-01 20:04:21 +03:00
again :
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
if ( p - > search_commit_root ) {
b = root - > commit_root ;
extent_buffer_get ( b ) ;
if ( ! p - > skip_locking )
btrfs_tree_lock ( b ) ;
} else {
if ( p - > skip_locking )
b = btrfs_root_node ( root ) ;
else
b = btrfs_lock_root_node ( root ) ;
}
2008-06-26 00:01:30 +04:00
2007-02-02 17:18:22 +03:00
while ( b ) {
2007-10-16 00:14:19 +04:00
level = btrfs_header_level ( b ) ;
2008-08-01 23:11:20 +04:00
/*
* setup the path here so we can release it under lock
* contention with the cow code
*/
p - > nodes [ level ] = b ;
if ( ! p - > skip_locking )
p - > locks [ level ] = 1 ;
2007-03-03 00:08:05 +03:00
if ( cow ) {
2009-04-03 18:14:18 +04:00
/*
* if we don ' t really need to cow this block
* then we don ' t want to set the path blocking ,
* so we test it here
*/
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
if ( ! should_cow_block ( trans , root , b ) )
2008-08-01 23:11:20 +04:00
goto cow_done ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
btrfs_set_path_blocking ( p ) ;
2009-07-22 17:59:00 +04:00
err = btrfs_cow_block ( trans , root , b ,
p - > nodes [ level + 1 ] ,
p - > slots [ level + 1 ] , & b ) ;
if ( err ) {
ret = err ;
2008-08-01 23:11:20 +04:00
goto done ;
2007-06-22 22:16:25 +04:00
}
2007-03-03 00:08:05 +03:00
}
2008-08-01 23:11:20 +04:00
cow_done :
2007-03-03 00:08:05 +03:00
BUG_ON ( ! cow & & ins_len ) ;
2008-08-01 23:11:20 +04:00
2007-02-02 17:18:22 +03:00
p - > nodes [ level ] = b ;
2008-06-26 00:01:30 +04:00
if ( ! p - > skip_locking )
p - > locks [ level ] = 1 ;
2008-08-01 23:11:20 +04:00
2009-02-12 22:09:45 +03:00
btrfs_clear_path_blocking ( p , NULL ) ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
/*
* we have a lock on b and as long as we aren ' t changing
* the tree , there is no way to for the items in b to change .
* It is safe to drop the lock on our parent before we
* go through the expensive btree search on b .
*
* If cow is true , then we might be changing slot zero ,
* which may require changing the parent . So , we can ' t
* drop the lock until after we know which slot we ' re
* operating on .
*/
if ( ! cow )
btrfs_unlock_up_safe ( p , level + 1 ) ;
2007-10-16 00:14:19 +04:00
ret = bin_search ( b , key , level , & slot ) ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
2007-10-16 00:14:19 +04:00
if ( level ! = 0 ) {
2009-07-22 17:59:00 +04:00
int dec = 0 ;
if ( ret & & slot > 0 ) {
dec = 1 ;
2007-01-26 23:51:26 +03:00
slot - = 1 ;
2009-07-22 17:59:00 +04:00
}
2007-01-26 23:51:26 +03:00
p - > slots [ level ] = slot ;
2009-07-22 17:59:00 +04:00
err = setup_nodes_for_search ( trans , root , p , b , level ,
2009-04-03 18:14:18 +04:00
ins_len ) ;
2009-07-22 17:59:00 +04:00
if ( err = = - EAGAIN )
2009-04-03 18:14:18 +04:00
goto again ;
2009-07-22 17:59:00 +04:00
if ( err ) {
ret = err ;
2009-04-03 18:14:18 +04:00
goto done ;
2009-07-22 17:59:00 +04:00
}
2009-04-03 18:14:18 +04:00
b = p - > nodes [ level ] ;
slot = p - > slots [ level ] ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
2008-06-26 00:14:04 +04:00
unlock_up ( p , level , lowest_unlock ) ;
2008-06-26 00:01:30 +04:00
if ( level = = lowest_level ) {
2009-07-22 17:59:00 +04:00
if ( dec )
p - > slots [ level ] + + ;
2008-09-26 18:05:38 +04:00
goto done ;
2008-06-26 00:01:30 +04:00
}
2008-05-12 20:59:19 +04:00
2009-07-22 17:59:00 +04:00
err = read_block_for_search ( trans , root , p ,
2009-04-03 18:14:18 +04:00
& b , level , slot , key ) ;
2009-07-22 17:59:00 +04:00
if ( err = = - EAGAIN )
2009-04-03 18:14:18 +04:00
goto again ;
2009-07-22 17:59:00 +04:00
if ( err ) {
ret = err ;
2009-05-14 21:24:30 +04:00
goto done ;
2009-07-22 17:59:00 +04:00
}
2009-05-14 21:24:30 +04:00
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
if ( ! p - > skip_locking ) {
2009-02-12 22:09:45 +03:00
btrfs_clear_path_blocking ( p , NULL ) ;
2009-07-22 17:59:00 +04:00
err = btrfs_try_spin_lock ( b ) ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
2009-07-22 17:59:00 +04:00
if ( ! err ) {
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
btrfs_set_path_blocking ( p ) ;
btrfs_tree_lock ( b ) ;
2009-02-12 22:09:45 +03:00
btrfs_clear_path_blocking ( p , b ) ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
}
}
2007-01-26 23:51:26 +03:00
} else {
p - > slots [ level ] = slot ;
2008-12-17 18:21:48 +03:00
if ( ins_len > 0 & &
btrfs_leaf_free_space ( root , b ) < ins_len ) {
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
btrfs_set_path_blocking ( p ) ;
2009-07-22 17:59:00 +04:00
err = split_leaf ( trans , root , key ,
p , ins_len , ret = = 0 ) ;
2009-02-12 22:09:45 +03:00
btrfs_clear_path_blocking ( p , NULL ) ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
2009-07-22 17:59:00 +04:00
BUG_ON ( err > 0 ) ;
if ( err ) {
ret = err ;
2008-08-01 23:11:20 +04:00
goto done ;
}
2007-02-22 19:39:13 +03:00
}
2008-12-10 17:10:46 +03:00
if ( ! p - > search_for_split )
unlock_up ( p , level , lowest_unlock ) ;
2008-08-01 23:11:20 +04:00
goto done ;
2007-01-26 23:51:26 +03:00
}
}
2008-08-01 23:11:20 +04:00
ret = 1 ;
done :
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
/*
* we don ' t really know what they plan on doing with the path
* from here on , so for now just mark it as blocking
*/
2009-03-13 18:00:37 +03:00
if ( ! p - > leave_spinning )
btrfs_set_path_blocking ( p ) ;
2009-05-14 21:24:30 +04:00
if ( ret < 0 )
2011-04-21 03:20:15 +04:00
btrfs_release_path ( p ) ;
2008-08-01 23:11:20 +04:00
return ret ;
2007-01-26 23:51:26 +03:00
}
2007-02-02 19:05:29 +03:00
/*
* adjust the pointers going up the tree , starting at level
* making sure the right key of each node is points to ' key ' .
* This is used after shifting pointers to the left , so it stops
* fixing up pointers when a given leaf / node is not in slot 0 of the
* higher levels
2007-03-01 00:35:06 +03:00
*
* If this fails to write a tree block , it returns - 1 , but continues
* fixing up the blocks in ram so the tree is consistent .
2007-02-02 19:05:29 +03:00
*/
2007-10-16 00:14:19 +04:00
static int fixup_low_keys ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root , struct btrfs_path * path ,
struct btrfs_disk_key * key , int level )
2007-01-26 23:51:26 +03:00
{
int i ;
2007-03-01 00:35:06 +03:00
int ret = 0 ;
2007-10-16 00:14:19 +04:00
struct extent_buffer * t ;
2007-03-13 17:46:10 +03:00
for ( i = level ; i < BTRFS_MAX_LEVEL ; i + + ) {
2007-01-26 23:51:26 +03:00
int tslot = path - > slots [ i ] ;
2007-02-02 17:18:22 +03:00
if ( ! path - > nodes [ i ] )
2007-01-26 23:51:26 +03:00
break ;
2007-10-16 00:14:19 +04:00
t = path - > nodes [ i ] ;
btrfs_set_node_key ( t , key , tslot ) ;
2007-03-30 22:27:56 +04:00
btrfs_mark_buffer_dirty ( path - > nodes [ i ] ) ;
2007-01-26 23:51:26 +03:00
if ( tslot ! = 0 )
break ;
}
2007-03-01 00:35:06 +03:00
return ret ;
2007-01-26 23:51:26 +03:00
}
2008-09-23 21:14:14 +04:00
/*
* update item key .
*
* This function isn ' t completely safe . It ' s the caller ' s responsibility
* that the new key won ' t break the order
*/
int btrfs_set_item_key_safe ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root , struct btrfs_path * path ,
struct btrfs_key * new_key )
{
struct btrfs_disk_key disk_key ;
struct extent_buffer * eb ;
int slot ;
eb = path - > nodes [ 0 ] ;
slot = path - > slots [ 0 ] ;
if ( slot > 0 ) {
btrfs_item_key ( eb , & disk_key , slot - 1 ) ;
if ( comp_keys ( & disk_key , new_key ) > = 0 )
return - 1 ;
}
if ( slot < btrfs_header_nritems ( eb ) - 1 ) {
btrfs_item_key ( eb , & disk_key , slot + 1 ) ;
if ( comp_keys ( & disk_key , new_key ) < = 0 )
return - 1 ;
}
btrfs_cpu_key_to_disk ( & disk_key , new_key ) ;
btrfs_set_item_key ( eb , & disk_key , slot ) ;
btrfs_mark_buffer_dirty ( eb ) ;
if ( slot = = 0 )
fixup_low_keys ( trans , root , path , & disk_key , 1 ) ;
return 0 ;
}
2007-02-02 19:05:29 +03:00
/*
* try to push data from one node into the next node left in the
2007-03-01 23:16:26 +03:00
* tree .
2007-03-01 00:35:06 +03:00
*
* returns 0 if some ptrs were pushed left , < 0 if there was some horrible
* error , and > 0 if there was no room in the left hand block .
2007-02-02 19:05:29 +03:00
*/
2008-01-03 18:01:48 +03:00
static int push_node_left ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root , struct extent_buffer * dst ,
2008-04-24 18:54:32 +04:00
struct extent_buffer * src , int empty )
2007-01-26 23:51:26 +03:00
{
int push_items = 0 ;
2007-03-01 20:04:21 +03:00
int src_nritems ;
int dst_nritems ;
2007-03-01 00:35:06 +03:00
int ret = 0 ;
2007-01-26 23:51:26 +03:00
2007-10-16 00:14:19 +04:00
src_nritems = btrfs_header_nritems ( src ) ;
dst_nritems = btrfs_header_nritems ( dst ) ;
2007-03-14 21:14:43 +03:00
push_items = BTRFS_NODEPTRS_PER_BLOCK ( root ) - dst_nritems ;
2007-12-11 17:25:06 +03:00
WARN_ON ( btrfs_header_generation ( src ) ! = trans - > transid ) ;
WARN_ON ( btrfs_header_generation ( dst ) ! = trans - > transid ) ;
2007-06-22 22:16:25 +04:00
2008-04-24 22:42:46 +04:00
if ( ! empty & & src_nritems < = 8 )
2008-04-24 18:54:32 +04:00
return 1 ;
2009-01-06 05:25:51 +03:00
if ( push_items < = 0 )
2007-01-26 23:51:26 +03:00
return 1 ;
2008-04-24 22:42:46 +04:00
if ( empty ) {
2008-04-24 18:54:32 +04:00
push_items = min ( src_nritems , push_items ) ;
2008-04-24 22:42:46 +04:00
if ( push_items < src_nritems ) {
/* leave at least 8 pointers in the node if
* we aren ' t going to empty it
*/
if ( src_nritems - push_items < 8 ) {
if ( push_items < = 8 )
return 1 ;
push_items - = 8 ;
}
}
} else
push_items = min ( src_nritems - 8 , push_items ) ;
2007-03-01 23:16:26 +03:00
2007-10-16 00:14:19 +04:00
copy_extent_buffer ( dst , src ,
btrfs_node_key_ptr_offset ( dst_nritems ) ,
btrfs_node_key_ptr_offset ( 0 ) ,
2009-01-06 05:25:51 +03:00
push_items * sizeof ( struct btrfs_key_ptr ) ) ;
2007-10-16 00:14:19 +04:00
2007-03-01 20:04:21 +03:00
if ( push_items < src_nritems ) {
2007-10-16 00:14:19 +04:00
memmove_extent_buffer ( src , btrfs_node_key_ptr_offset ( 0 ) ,
btrfs_node_key_ptr_offset ( push_items ) ,
( src_nritems - push_items ) *
sizeof ( struct btrfs_key_ptr ) ) ;
}
btrfs_set_header_nritems ( src , src_nritems - push_items ) ;
btrfs_set_header_nritems ( dst , dst_nritems + push_items ) ;
btrfs_mark_buffer_dirty ( src ) ;
btrfs_mark_buffer_dirty ( dst ) ;
2008-09-23 21:14:14 +04:00
2007-03-01 23:16:26 +03:00
return ret ;
}
/*
* try to push data from one node into the next node right in the
* tree .
*
* returns 0 if some ptrs were pushed , < 0 if there was some horrible
* error , and > 0 if there was no room in the right hand block .
*
* this will only push up to 1 / 2 the contents of the left node over
*/
2007-10-16 00:14:19 +04:00
static int balance_node_right ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct extent_buffer * dst ,
struct extent_buffer * src )
2007-03-01 23:16:26 +03:00
{
int push_items = 0 ;
int max_push ;
int src_nritems ;
int dst_nritems ;
int ret = 0 ;
2007-12-11 17:25:06 +03:00
WARN_ON ( btrfs_header_generation ( src ) ! = trans - > transid ) ;
WARN_ON ( btrfs_header_generation ( dst ) ! = trans - > transid ) ;
2007-10-16 00:14:19 +04:00
src_nritems = btrfs_header_nritems ( src ) ;
dst_nritems = btrfs_header_nritems ( dst ) ;
2007-03-14 21:14:43 +03:00
push_items = BTRFS_NODEPTRS_PER_BLOCK ( root ) - dst_nritems ;
2009-01-06 05:25:51 +03:00
if ( push_items < = 0 )
2007-03-01 23:16:26 +03:00
return 1 ;
2008-04-24 22:42:46 +04:00
2009-01-06 05:25:51 +03:00
if ( src_nritems < 4 )
2008-04-24 22:42:46 +04:00
return 1 ;
2007-03-01 23:16:26 +03:00
max_push = src_nritems / 2 + 1 ;
/* don't try to empty the node */
2009-01-06 05:25:51 +03:00
if ( max_push > = src_nritems )
2007-03-01 23:16:26 +03:00
return 1 ;
2007-08-29 17:11:44 +04:00
2007-03-01 23:16:26 +03:00
if ( max_push < push_items )
push_items = max_push ;
2007-10-16 00:14:19 +04:00
memmove_extent_buffer ( dst , btrfs_node_key_ptr_offset ( push_items ) ,
btrfs_node_key_ptr_offset ( 0 ) ,
( dst_nritems ) *
sizeof ( struct btrfs_key_ptr ) ) ;
2007-03-30 22:27:56 +04:00
2007-10-16 00:14:19 +04:00
copy_extent_buffer ( dst , src ,
btrfs_node_key_ptr_offset ( 0 ) ,
btrfs_node_key_ptr_offset ( src_nritems - push_items ) ,
2009-01-06 05:25:51 +03:00
push_items * sizeof ( struct btrfs_key_ptr ) ) ;
2007-03-01 23:16:26 +03:00
2007-10-16 00:14:19 +04:00
btrfs_set_header_nritems ( src , src_nritems - push_items ) ;
btrfs_set_header_nritems ( dst , dst_nritems + push_items ) ;
2007-03-01 23:16:26 +03:00
2007-10-16 00:14:19 +04:00
btrfs_mark_buffer_dirty ( src ) ;
btrfs_mark_buffer_dirty ( dst ) ;
2008-09-23 21:14:14 +04:00
2007-03-01 00:35:06 +03:00
return ret ;
2007-01-26 23:51:26 +03:00
}
2007-02-24 21:39:08 +03:00
/*
* helper function to insert a new root level in the tree .
* A new node is allocated , and a single item is inserted to
* point to the existing root
2007-03-01 00:35:06 +03:00
*
* returns zero on success or < 0 on failure .
2007-02-24 21:39:08 +03:00
*/
2009-01-06 05:25:51 +03:00
static noinline int insert_new_root ( struct btrfs_trans_handle * trans ,
2007-10-16 00:14:19 +04:00
struct btrfs_root * root ,
struct btrfs_path * path , int level )
2007-02-22 19:39:13 +03:00
{
2007-12-11 17:25:06 +03:00
u64 lower_gen ;
2007-10-16 00:14:19 +04:00
struct extent_buffer * lower ;
struct extent_buffer * c ;
2008-06-26 00:01:30 +04:00
struct extent_buffer * old ;
2007-10-16 00:14:19 +04:00
struct btrfs_disk_key lower_key ;
2007-02-22 19:39:13 +03:00
BUG_ON ( path - > nodes [ level ] ) ;
BUG_ON ( path - > nodes [ level - 1 ] ! = root - > node ) ;
2007-12-11 17:25:06 +03:00
lower = path - > nodes [ level - 1 ] ;
if ( level = = 1 )
btrfs_item_key ( lower , & lower_key , 0 ) ;
else
btrfs_node_key ( lower , & lower_key , 0 ) ;
2008-09-23 21:14:14 +04:00
c = btrfs_alloc_free_block ( trans , root , root - > nodesize , 0 ,
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
root - > root_key . objectid , & lower_key ,
2008-09-06 00:43:28 +04:00
level , root - > node - > start , 0 ) ;
2007-10-16 00:14:19 +04:00
if ( IS_ERR ( c ) )
return PTR_ERR ( c ) ;
2008-06-26 00:01:30 +04:00
2010-05-16 18:46:25 +04:00
root_add_used ( root , root - > nodesize ) ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
memset_extent_buffer ( c , 0 , 0 , sizeof ( struct btrfs_header ) ) ;
2007-10-16 00:14:19 +04:00
btrfs_set_header_nritems ( c , 1 ) ;
btrfs_set_header_level ( c , level ) ;
2007-10-16 00:15:53 +04:00
btrfs_set_header_bytenr ( c , c - > start ) ;
2007-10-16 00:14:19 +04:00
btrfs_set_header_generation ( c , trans - > transid ) ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
btrfs_set_header_backref_rev ( c , BTRFS_MIXED_BACKREF_REV ) ;
2007-10-16 00:14:19 +04:00
btrfs_set_header_owner ( c , root - > root_key . objectid ) ;
write_extent_buffer ( c , root - > fs_info - > fsid ,
( unsigned long ) btrfs_header_fsid ( c ) ,
BTRFS_FSID_SIZE ) ;
2008-04-15 23:41:47 +04:00
write_extent_buffer ( c , root - > fs_info - > chunk_tree_uuid ,
( unsigned long ) btrfs_header_chunk_tree_uuid ( c ) ,
BTRFS_UUID_SIZE ) ;
2007-10-16 00:14:19 +04:00
btrfs_set_node_key ( c , & lower_key , 0 ) ;
2007-10-16 00:15:53 +04:00
btrfs_set_node_blockptr ( c , 0 , lower - > start ) ;
2007-12-11 17:25:06 +03:00
lower_gen = btrfs_header_generation ( lower ) ;
2008-09-23 21:14:14 +04:00
WARN_ON ( lower_gen ! = trans - > transid ) ;
2007-12-11 17:25:06 +03:00
btrfs_set_node_ptr_generation ( c , 0 , lower_gen ) ;
2007-03-23 17:01:08 +03:00
2007-10-16 00:14:19 +04:00
btrfs_mark_buffer_dirty ( c ) ;
2007-03-23 17:01:08 +03:00
2008-06-26 00:01:30 +04:00
old = root - > node ;
2011-03-23 21:54:42 +03:00
rcu_assign_pointer ( root - > node , c ) ;
2008-06-26 00:01:30 +04:00
/* the super has an extra ref to root->node */
free_extent_buffer ( old ) ;
2008-03-24 22:01:56 +03:00
add_root_to_dirty_list ( root ) ;
2007-10-16 00:14:19 +04:00
extent_buffer_get ( c ) ;
path - > nodes [ level ] = c ;
2008-06-26 00:01:30 +04:00
path - > locks [ level ] = 1 ;
2007-02-22 19:39:13 +03:00
path - > slots [ level ] = 0 ;
return 0 ;
}
2007-02-02 19:05:29 +03:00
/*
* worker function to insert a single pointer in a node .
* the node should have enough room for the pointer already
2007-02-24 21:39:08 +03:00
*
2007-02-02 19:05:29 +03:00
* slot and level indicate where you want the key to go , and
* blocknr is the block the key points to .
2007-03-01 00:35:06 +03:00
*
* returns zero on success and < 0 on any error
2007-02-02 19:05:29 +03:00
*/
2007-03-16 23:20:31 +03:00
static int insert_ptr ( struct btrfs_trans_handle * trans , struct btrfs_root
* root , struct btrfs_path * path , struct btrfs_disk_key
2007-10-16 00:15:53 +04:00
* key , u64 bytenr , int slot , int level )
2007-02-02 19:05:29 +03:00
{
2007-10-16 00:14:19 +04:00
struct extent_buffer * lower ;
2007-02-02 19:05:29 +03:00
int nritems ;
2007-02-22 19:39:13 +03:00
BUG_ON ( ! path - > nodes [ level ] ) ;
2010-05-16 18:46:25 +04:00
btrfs_assert_tree_locked ( path - > nodes [ level ] ) ;
2007-10-16 00:14:19 +04:00
lower = path - > nodes [ level ] ;
nritems = btrfs_header_nritems ( lower ) ;
2009-04-03 01:05:11 +04:00
BUG_ON ( slot > nritems ) ;
2007-03-14 21:14:43 +03:00
if ( nritems = = BTRFS_NODEPTRS_PER_BLOCK ( root ) )
2007-02-02 19:05:29 +03:00
BUG ( ) ;
if ( slot ! = nritems ) {
2007-10-16 00:14:19 +04:00
memmove_extent_buffer ( lower ,
btrfs_node_key_ptr_offset ( slot + 1 ) ,
btrfs_node_key_ptr_offset ( slot ) ,
2007-03-30 22:27:56 +04:00
( nritems - slot ) * sizeof ( struct btrfs_key_ptr ) ) ;
2007-02-02 19:05:29 +03:00
}
2007-10-16 00:14:19 +04:00
btrfs_set_node_key ( lower , key , slot ) ;
2007-10-16 00:15:53 +04:00
btrfs_set_node_blockptr ( lower , slot , bytenr ) ;
2007-12-11 17:25:06 +03:00
WARN_ON ( trans - > transid = = 0 ) ;
btrfs_set_node_ptr_generation ( lower , slot , trans - > transid ) ;
2007-10-16 00:14:19 +04:00
btrfs_set_header_nritems ( lower , nritems + 1 ) ;
btrfs_mark_buffer_dirty ( lower ) ;
2007-02-02 19:05:29 +03:00
return 0 ;
}
2007-02-24 21:39:08 +03:00
/*
* split the node at the specified level in path in two .
* The path is corrected to point to the appropriate node after the split
*
* Before splitting this tries to make some room in the node by pushing
* left and right , if either one works , it returns right away .
2007-03-01 00:35:06 +03:00
*
* returns 0 on success and < 0 on failure
2007-02-24 21:39:08 +03:00
*/
2008-09-06 00:13:11 +04:00
static noinline int split_node ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct btrfs_path * path , int level )
2007-01-26 23:51:26 +03:00
{
2007-10-16 00:14:19 +04:00
struct extent_buffer * c ;
struct extent_buffer * split ;
struct btrfs_disk_key disk_key ;
2007-01-26 23:51:26 +03:00
int mid ;
2007-02-22 19:39:13 +03:00
int ret ;
2007-03-01 00:35:06 +03:00
int wret ;
2007-03-12 19:01:18 +03:00
u32 c_nritems ;
2007-02-02 17:18:22 +03:00
2007-10-16 00:14:19 +04:00
c = path - > nodes [ level ] ;
2007-12-11 17:25:06 +03:00
WARN_ON ( btrfs_header_generation ( c ) ! = trans - > transid ) ;
2007-10-16 00:14:19 +04:00
if ( c = = root - > node ) {
2007-02-22 19:39:13 +03:00
/* trying to split the root, lets make a new one */
2007-03-16 23:20:31 +03:00
ret = insert_new_root ( trans , root , path , level + 1 ) ;
2007-02-22 19:39:13 +03:00
if ( ret )
return ret ;
2009-05-14 03:12:15 +04:00
} else {
2007-04-20 21:16:02 +04:00
ret = push_nodes_for_insert ( trans , root , path , level ) ;
2007-10-16 00:14:19 +04:00
c = path - > nodes [ level ] ;
if ( ! ret & & btrfs_header_nritems ( c ) <
2008-04-24 17:34:34 +04:00
BTRFS_NODEPTRS_PER_BLOCK ( root ) - 3 )
2007-04-20 21:16:02 +04:00
return 0 ;
2007-06-22 22:16:25 +04:00
if ( ret < 0 )
return ret ;
2007-01-26 23:51:26 +03:00
}
2007-04-20 21:16:02 +04:00
2007-10-16 00:14:19 +04:00
c_nritems = btrfs_header_nritems ( c ) ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
mid = ( c_nritems + 1 ) / 2 ;
btrfs_node_key ( c , & disk_key , mid ) ;
2007-12-11 17:25:06 +03:00
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
split = btrfs_alloc_free_block ( trans , root , root - > nodesize , 0 ,
2008-09-23 21:14:14 +04:00
root - > root_key . objectid ,
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
& disk_key , level , c - > start , 0 ) ;
2007-10-16 00:14:19 +04:00
if ( IS_ERR ( split ) )
return PTR_ERR ( split ) ;
2010-05-16 18:46:25 +04:00
root_add_used ( root , root - > nodesize ) ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
memset_extent_buffer ( split , 0 , 0 , sizeof ( struct btrfs_header ) ) ;
2007-10-16 00:14:19 +04:00
btrfs_set_header_level ( split , btrfs_header_level ( c ) ) ;
2007-10-16 00:15:53 +04:00
btrfs_set_header_bytenr ( split , split - > start ) ;
2007-10-16 00:14:19 +04:00
btrfs_set_header_generation ( split , trans - > transid ) ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
btrfs_set_header_backref_rev ( split , BTRFS_MIXED_BACKREF_REV ) ;
2007-10-16 00:14:19 +04:00
btrfs_set_header_owner ( split , root - > root_key . objectid ) ;
write_extent_buffer ( split , root - > fs_info - > fsid ,
( unsigned long ) btrfs_header_fsid ( split ) ,
BTRFS_FSID_SIZE ) ;
2008-04-15 23:41:47 +04:00
write_extent_buffer ( split , root - > fs_info - > chunk_tree_uuid ,
( unsigned long ) btrfs_header_chunk_tree_uuid ( split ) ,
BTRFS_UUID_SIZE ) ;
2007-06-22 22:16:25 +04:00
2007-10-16 00:14:19 +04:00
copy_extent_buffer ( split , c ,
btrfs_node_key_ptr_offset ( 0 ) ,
btrfs_node_key_ptr_offset ( mid ) ,
( c_nritems - mid ) * sizeof ( struct btrfs_key_ptr ) ) ;
btrfs_set_header_nritems ( split , c_nritems - mid ) ;
btrfs_set_header_nritems ( c , mid ) ;
2007-03-01 00:35:06 +03:00
ret = 0 ;
2007-10-16 00:14:19 +04:00
btrfs_mark_buffer_dirty ( c ) ;
btrfs_mark_buffer_dirty ( split ) ;
2007-10-16 00:15:53 +04:00
wret = insert_ptr ( trans , root , path , & disk_key , split - > start ,
2007-10-16 00:14:19 +04:00
path - > slots [ level + 1 ] + 1 ,
2007-03-14 21:14:43 +03:00
level + 1 ) ;
2007-03-01 00:35:06 +03:00
if ( wret )
ret = wret ;
2007-02-24 14:24:44 +03:00
if ( path - > slots [ level ] > = mid ) {
2007-02-22 19:39:13 +03:00
path - > slots [ level ] - = mid ;
2008-06-26 00:01:30 +04:00
btrfs_tree_unlock ( c ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( c ) ;
path - > nodes [ level ] = split ;
2007-02-22 19:39:13 +03:00
path - > slots [ level + 1 ] + = 1 ;
} else {
2008-06-26 00:01:30 +04:00
btrfs_tree_unlock ( split ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( split ) ;
2007-01-26 23:51:26 +03:00
}
2007-03-01 00:35:06 +03:00
return ret ;
2007-01-26 23:51:26 +03:00
}
2007-02-02 19:05:29 +03:00
/*
* how many bytes are required to store the items in a leaf . start
* and nr indicate which items in the leaf to check . This totals up the
* space used both by the item structs and the item data
*/
2007-10-16 00:14:19 +04:00
static int leaf_space_used ( struct extent_buffer * l , int start , int nr )
2007-01-26 23:51:26 +03:00
{
int data_len ;
2007-10-16 00:14:19 +04:00
int nritems = btrfs_header_nritems ( l ) ;
2007-04-04 22:08:15 +04:00
int end = min ( nritems , start + nr ) - 1 ;
2007-01-26 23:51:26 +03:00
if ( ! nr )
return 0 ;
2007-10-16 00:14:19 +04:00
data_len = btrfs_item_end_nr ( l , start ) ;
data_len = data_len - btrfs_item_offset_nr ( l , end ) ;
2007-03-13 03:12:07 +03:00
data_len + = sizeof ( struct btrfs_item ) * nr ;
2007-04-04 22:08:15 +04:00
WARN_ON ( data_len < 0 ) ;
2007-01-26 23:51:26 +03:00
return data_len ;
}
2007-04-04 22:08:15 +04:00
/*
* The space between the end of the leaf items and
* the start of the leaf data . IOW , how much room
* the leaf has left for both items and data
*/
2009-01-06 05:25:51 +03:00
noinline int btrfs_leaf_free_space ( struct btrfs_root * root ,
2008-09-06 00:13:11 +04:00
struct extent_buffer * leaf )
2007-04-04 22:08:15 +04:00
{
2007-10-16 00:14:19 +04:00
int nritems = btrfs_header_nritems ( leaf ) ;
int ret ;
ret = BTRFS_LEAF_DATA_SIZE ( root ) - leaf_space_used ( leaf , 0 , nritems ) ;
if ( ret < 0 ) {
2009-01-06 05:25:51 +03:00
printk ( KERN_CRIT " leaf free space ret %d, leaf data size %lu, "
" used %d nritems %d \n " ,
2007-10-19 17:22:59 +04:00
ret , ( unsigned long ) BTRFS_LEAF_DATA_SIZE ( root ) ,
2007-10-16 00:14:19 +04:00
leaf_space_used ( leaf , 0 , nritems ) , nritems ) ;
}
return ret ;
2007-04-04 22:08:15 +04:00
}
2010-07-07 18:51:48 +04:00
/*
* min slot controls the lowest index we ' re willing to push to the
* right . We ' ll push up to and including min_slot , but no lower
*/
2009-03-13 17:04:31 +03:00
static noinline int __push_leaf_right ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct btrfs_path * path ,
int data_size , int empty ,
struct extent_buffer * right ,
2010-07-07 18:51:48 +04:00
int free_space , u32 left_nritems ,
u32 min_slot )
2007-02-24 20:47:20 +03:00
{
2007-10-16 00:14:19 +04:00
struct extent_buffer * left = path - > nodes [ 0 ] ;
2009-03-13 17:04:31 +03:00
struct extent_buffer * upper = path - > nodes [ 1 ] ;
2007-10-16 00:14:19 +04:00
struct btrfs_disk_key disk_key ;
2007-02-24 20:47:20 +03:00
int slot ;
2007-11-07 21:31:03 +03:00
u32 i ;
2007-02-24 20:47:20 +03:00
int push_space = 0 ;
int push_items = 0 ;
2007-03-13 03:12:07 +03:00
struct btrfs_item * item ;
2007-11-07 21:31:03 +03:00
u32 nr ;
2007-03-12 19:01:18 +03:00
u32 right_nritems ;
2007-10-16 00:14:19 +04:00
u32 data_end ;
2007-10-16 00:15:53 +04:00
u32 this_item_size ;
2007-02-24 20:47:20 +03:00
2007-11-07 21:31:03 +03:00
if ( empty )
nr = 0 ;
else
2010-07-07 18:51:48 +04:00
nr = max_t ( u32 , 1 , min_slot ) ;
2007-11-07 21:31:03 +03:00
2008-09-23 21:14:14 +04:00
if ( path - > slots [ 0 ] > = left_nritems )
2008-12-17 18:21:48 +03:00
push_space + = data_size ;
2008-09-23 21:14:14 +04:00
2009-03-13 17:04:31 +03:00
slot = path - > slots [ 1 ] ;
2007-11-07 21:31:03 +03:00
i = left_nritems - 1 ;
while ( i > = nr ) {
2007-10-16 00:14:19 +04:00
item = btrfs_item_nr ( left , i ) ;
2007-10-16 00:15:53 +04:00
2008-09-23 21:14:14 +04:00
if ( ! empty & & push_items > 0 ) {
if ( path - > slots [ 0 ] > i )
break ;
if ( path - > slots [ 0 ] = = i ) {
int space = btrfs_leaf_free_space ( root , left ) ;
if ( space + push_space * 2 > free_space )
break ;
}
}
2007-02-24 20:47:20 +03:00
if ( path - > slots [ 0 ] = = i )
2008-12-17 18:21:48 +03:00
push_space + = data_size ;
2007-10-16 00:15:53 +04:00
if ( ! left - > map_token ) {
map_extent_buffer ( left , ( unsigned long ) item ,
sizeof ( struct btrfs_item ) ,
& left - > map_token , & left - > kaddr ,
& left - > map_start , & left - > map_len ,
KM_USER1 ) ;
}
this_item_size = btrfs_item_size ( left , item ) ;
if ( this_item_size + sizeof ( * item ) + push_space > free_space )
2007-02-24 20:47:20 +03:00
break ;
2008-09-23 21:14:14 +04:00
2007-02-24 20:47:20 +03:00
push_items + + ;
2007-10-16 00:15:53 +04:00
push_space + = this_item_size + sizeof ( * item ) ;
2007-11-07 21:31:03 +03:00
if ( i = = 0 )
break ;
i - - ;
2007-10-16 00:15:53 +04:00
}
if ( left - > map_token ) {
unmap_extent_buffer ( left , left - > map_token , KM_USER1 ) ;
left - > map_token = NULL ;
2007-02-24 20:47:20 +03:00
}
2007-10-16 00:14:19 +04:00
2008-06-26 00:01:30 +04:00
if ( push_items = = 0 )
goto out_unlock ;
2007-10-16 00:14:19 +04:00
2007-11-07 21:31:03 +03:00
if ( ! empty & & push_items = = left_nritems )
2007-04-19 00:15:28 +04:00
WARN_ON ( 1 ) ;
2007-10-16 00:14:19 +04:00
2007-02-24 20:47:20 +03:00
/* push left to right */
2007-10-16 00:14:19 +04:00
right_nritems = btrfs_header_nritems ( right ) ;
2007-11-07 21:31:03 +03:00
2007-10-16 00:14:19 +04:00
push_space = btrfs_item_end_nr ( left , left_nritems - push_items ) ;
2007-03-14 21:14:43 +03:00
push_space - = leaf_data_end ( root , left ) ;
2007-10-16 00:14:19 +04:00
2007-02-24 20:47:20 +03:00
/* make room in the right data area */
2007-10-16 00:14:19 +04:00
data_end = leaf_data_end ( root , right ) ;
memmove_extent_buffer ( right ,
btrfs_leaf_data ( right ) + data_end - push_space ,
btrfs_leaf_data ( right ) + data_end ,
BTRFS_LEAF_DATA_SIZE ( root ) - data_end ) ;
2007-02-24 20:47:20 +03:00
/* copy from the left data area */
2007-10-16 00:14:19 +04:00
copy_extent_buffer ( right , left , btrfs_leaf_data ( right ) +
2007-03-30 22:27:56 +04:00
BTRFS_LEAF_DATA_SIZE ( root ) - push_space ,
btrfs_leaf_data ( left ) + leaf_data_end ( root , left ) ,
push_space ) ;
2007-10-16 00:14:19 +04:00
memmove_extent_buffer ( right , btrfs_item_nr_offset ( push_items ) ,
btrfs_item_nr_offset ( 0 ) ,
right_nritems * sizeof ( struct btrfs_item ) ) ;
2007-02-24 20:47:20 +03:00
/* copy the items from left to right */
2007-10-16 00:14:19 +04:00
copy_extent_buffer ( right , left , btrfs_item_nr_offset ( 0 ) ,
btrfs_item_nr_offset ( left_nritems - push_items ) ,
push_items * sizeof ( struct btrfs_item ) ) ;
2007-02-24 20:47:20 +03:00
/* update the item pointers */
2007-03-12 19:01:18 +03:00
right_nritems + = push_items ;
2007-10-16 00:14:19 +04:00
btrfs_set_header_nritems ( right , right_nritems ) ;
2007-03-14 21:14:43 +03:00
push_space = BTRFS_LEAF_DATA_SIZE ( root ) ;
2007-03-12 19:01:18 +03:00
for ( i = 0 ; i < right_nritems ; i + + ) {
2007-10-16 00:14:19 +04:00
item = btrfs_item_nr ( right , i ) ;
2007-10-16 00:15:53 +04:00
if ( ! right - > map_token ) {
map_extent_buffer ( right , ( unsigned long ) item ,
sizeof ( struct btrfs_item ) ,
& right - > map_token , & right - > kaddr ,
& right - > map_start , & right - > map_len ,
KM_USER1 ) ;
}
push_space - = btrfs_item_size ( right , item ) ;
btrfs_set_item_offset ( right , item , push_space ) ;
}
if ( right - > map_token ) {
unmap_extent_buffer ( right , right - > map_token , KM_USER1 ) ;
right - > map_token = NULL ;
2007-02-24 20:47:20 +03:00
}
2007-03-12 19:01:18 +03:00
left_nritems - = push_items ;
2007-10-16 00:14:19 +04:00
btrfs_set_header_nritems ( left , left_nritems ) ;
2007-02-24 20:47:20 +03:00
2007-11-07 21:31:03 +03:00
if ( left_nritems )
btrfs_mark_buffer_dirty ( left ) ;
2010-05-16 18:46:25 +04:00
else
clean_tree_block ( trans , root , left ) ;
2007-10-16 00:14:19 +04:00
btrfs_mark_buffer_dirty ( right ) ;
2007-04-19 00:15:28 +04:00
2007-10-16 00:14:19 +04:00
btrfs_item_key ( right , & disk_key , 0 ) ;
btrfs_set_node_key ( upper , & disk_key , slot + 1 ) ;
2007-03-30 22:27:56 +04:00
btrfs_mark_buffer_dirty ( upper ) ;
2007-03-03 00:08:05 +03:00
2007-02-24 20:47:20 +03:00
/* then fixup the leaf pointer in the path */
2007-03-12 19:01:18 +03:00
if ( path - > slots [ 0 ] > = left_nritems ) {
path - > slots [ 0 ] - = left_nritems ;
2008-06-26 00:01:30 +04:00
if ( btrfs_header_nritems ( path - > nodes [ 0 ] ) = = 0 )
clean_tree_block ( trans , root , path - > nodes [ 0 ] ) ;
btrfs_tree_unlock ( path - > nodes [ 0 ] ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( path - > nodes [ 0 ] ) ;
path - > nodes [ 0 ] = right ;
2007-02-24 20:47:20 +03:00
path - > slots [ 1 ] + = 1 ;
} else {
2008-06-26 00:01:30 +04:00
btrfs_tree_unlock ( right ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( right ) ;
2007-02-24 20:47:20 +03:00
}
return 0 ;
2008-06-26 00:01:30 +04:00
out_unlock :
btrfs_tree_unlock ( right ) ;
free_extent_buffer ( right ) ;
return 1 ;
2007-02-24 20:47:20 +03:00
}
2008-06-26 00:01:30 +04:00
2009-03-13 17:04:31 +03:00
/*
* push some data in the path leaf to the right , trying to free up at
* least data_size bytes . returns zero if the push worked , nonzero otherwise
*
* returns 1 if the push failed because the other node didn ' t have enough
* room , 0 if everything worked out and < 0 if there were major errors .
2010-07-07 18:51:48 +04:00
*
* this will push starting from min_slot to the end of the leaf . It won ' t
* push any slot lower than min_slot
2009-03-13 17:04:31 +03:00
*/
static int push_leaf_right ( struct btrfs_trans_handle * trans , struct btrfs_root
2010-07-07 18:51:48 +04:00
* root , struct btrfs_path * path ,
int min_data_size , int data_size ,
int empty , u32 min_slot )
2009-03-13 17:04:31 +03:00
{
struct extent_buffer * left = path - > nodes [ 0 ] ;
struct extent_buffer * right ;
struct extent_buffer * upper ;
int slot ;
int free_space ;
u32 left_nritems ;
int ret ;
if ( ! path - > nodes [ 1 ] )
return 1 ;
slot = path - > slots [ 1 ] ;
upper = path - > nodes [ 1 ] ;
if ( slot > = btrfs_header_nritems ( upper ) - 1 )
return 1 ;
btrfs_assert_tree_locked ( path - > nodes [ 1 ] ) ;
right = read_node_slot ( root , upper , slot + 1 ) ;
2011-01-05 05:32:22 +03:00
if ( right = = NULL )
return 1 ;
2009-03-13 17:04:31 +03:00
btrfs_tree_lock ( right ) ;
btrfs_set_lock_blocking ( right ) ;
free_space = btrfs_leaf_free_space ( root , right ) ;
if ( free_space < data_size )
goto out_unlock ;
/* cow and double check */
ret = btrfs_cow_block ( trans , root , right , upper ,
slot + 1 , & right ) ;
if ( ret )
goto out_unlock ;
free_space = btrfs_leaf_free_space ( root , right ) ;
if ( free_space < data_size )
goto out_unlock ;
left_nritems = btrfs_header_nritems ( left ) ;
if ( left_nritems = = 0 )
goto out_unlock ;
2010-07-07 18:51:48 +04:00
return __push_leaf_right ( trans , root , path , min_data_size , empty ,
right , free_space , left_nritems , min_slot ) ;
2009-03-13 17:04:31 +03:00
out_unlock :
btrfs_tree_unlock ( right ) ;
free_extent_buffer ( right ) ;
return 1 ;
}
2007-02-02 19:05:29 +03:00
/*
* push some data in the path leaf to the left , trying to free up at
* least data_size bytes . returns zero if the push worked , nonzero otherwise
2010-07-07 18:51:48 +04:00
*
* max_slot can put a limit on how far into the leaf we ' ll push items . The
* item at ' max_slot ' won ' t be touched . Use ( u32 ) - 1 to make us do all the
* items
2007-02-02 19:05:29 +03:00
*/
2009-03-13 17:04:31 +03:00
static noinline int __push_leaf_left ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct btrfs_path * path , int data_size ,
int empty , struct extent_buffer * left ,
2010-07-07 18:51:48 +04:00
int free_space , u32 right_nritems ,
u32 max_slot )
2007-01-26 23:51:26 +03:00
{
2007-10-16 00:14:19 +04:00
struct btrfs_disk_key disk_key ;
struct extent_buffer * right = path - > nodes [ 0 ] ;
2007-01-26 23:51:26 +03:00
int i ;
int push_space = 0 ;
int push_items = 0 ;
2007-03-13 03:12:07 +03:00
struct btrfs_item * item ;
2007-03-12 19:01:18 +03:00
u32 old_left_nritems ;
2007-11-07 21:31:03 +03:00
u32 nr ;
2007-03-01 00:35:06 +03:00
int ret = 0 ;
int wret ;
2007-10-16 00:15:53 +04:00
u32 this_item_size ;
u32 old_left_item_size ;
2007-01-26 23:51:26 +03:00
2007-11-07 21:31:03 +03:00
if ( empty )
2010-07-07 18:51:48 +04:00
nr = min ( right_nritems , max_slot ) ;
2007-11-07 21:31:03 +03:00
else
2010-07-07 18:51:48 +04:00
nr = min ( right_nritems - 1 , max_slot ) ;
2007-11-07 21:31:03 +03:00
for ( i = 0 ; i < nr ; i + + ) {
2007-10-16 00:14:19 +04:00
item = btrfs_item_nr ( right , i ) ;
2007-10-16 00:15:53 +04:00
if ( ! right - > map_token ) {
map_extent_buffer ( right , ( unsigned long ) item ,
sizeof ( struct btrfs_item ) ,
& right - > map_token , & right - > kaddr ,
& right - > map_start , & right - > map_len ,
KM_USER1 ) ;
}
2008-09-23 21:14:14 +04:00
if ( ! empty & & push_items > 0 ) {
if ( path - > slots [ 0 ] < i )
break ;
if ( path - > slots [ 0 ] = = i ) {
int space = btrfs_leaf_free_space ( root , right ) ;
if ( space + push_space * 2 > free_space )
break ;
}
}
2007-01-26 23:51:26 +03:00
if ( path - > slots [ 0 ] = = i )
2008-12-17 18:21:48 +03:00
push_space + = data_size ;
2007-10-16 00:15:53 +04:00
this_item_size = btrfs_item_size ( right , item ) ;
if ( this_item_size + sizeof ( * item ) + push_space > free_space )
2007-01-26 23:51:26 +03:00
break ;
2007-10-16 00:15:53 +04:00
2007-01-26 23:51:26 +03:00
push_items + + ;
2007-10-16 00:15:53 +04:00
push_space + = this_item_size + sizeof ( * item ) ;
}
if ( right - > map_token ) {
unmap_extent_buffer ( right , right - > map_token , KM_USER1 ) ;
right - > map_token = NULL ;
2007-01-26 23:51:26 +03:00
}
2007-10-16 00:15:53 +04:00
2007-01-26 23:51:26 +03:00
if ( push_items = = 0 ) {
2008-06-26 00:01:30 +04:00
ret = 1 ;
goto out ;
2007-01-26 23:51:26 +03:00
}
2007-11-07 21:31:03 +03:00
if ( ! empty & & push_items = = btrfs_header_nritems ( right ) )
2007-04-19 00:15:28 +04:00
WARN_ON ( 1 ) ;
2007-10-16 00:14:19 +04:00
2007-01-26 23:51:26 +03:00
/* push data from right to left */
2007-10-16 00:14:19 +04:00
copy_extent_buffer ( left , right ,
btrfs_item_nr_offset ( btrfs_header_nritems ( left ) ) ,
btrfs_item_nr_offset ( 0 ) ,
push_items * sizeof ( struct btrfs_item ) ) ;
2007-03-14 21:14:43 +03:00
push_space = BTRFS_LEAF_DATA_SIZE ( root ) -
2009-01-06 05:25:51 +03:00
btrfs_item_offset_nr ( right , push_items - 1 ) ;
2007-10-16 00:14:19 +04:00
copy_extent_buffer ( left , right , btrfs_leaf_data ( left ) +
2007-03-30 22:27:56 +04:00
leaf_data_end ( root , left ) - push_space ,
btrfs_leaf_data ( right ) +
2007-10-16 00:14:19 +04:00
btrfs_item_offset_nr ( right , push_items - 1 ) ,
2007-03-30 22:27:56 +04:00
push_space ) ;
2007-10-16 00:14:19 +04:00
old_left_nritems = btrfs_header_nritems ( left ) ;
2008-12-17 18:21:48 +03:00
BUG_ON ( old_left_nritems < = 0 ) ;
2007-02-02 17:18:22 +03:00
2007-10-16 00:15:53 +04:00
old_left_item_size = btrfs_item_offset_nr ( left , old_left_nritems - 1 ) ;
2007-03-13 03:12:07 +03:00
for ( i = old_left_nritems ; i < old_left_nritems + push_items ; i + + ) {
2007-10-16 00:14:19 +04:00
u32 ioff ;
2007-10-16 00:15:53 +04:00
2007-10-16 00:14:19 +04:00
item = btrfs_item_nr ( left , i ) ;
2007-10-16 00:15:53 +04:00
if ( ! left - > map_token ) {
map_extent_buffer ( left , ( unsigned long ) item ,
sizeof ( struct btrfs_item ) ,
& left - > map_token , & left - > kaddr ,
& left - > map_start , & left - > map_len ,
KM_USER1 ) ;
}
2007-10-16 00:14:19 +04:00
ioff = btrfs_item_offset ( left , item ) ;
btrfs_set_item_offset ( left , item ,
2007-10-16 00:15:53 +04:00
ioff - ( BTRFS_LEAF_DATA_SIZE ( root ) - old_left_item_size ) ) ;
2007-01-26 23:51:26 +03:00
}
2007-10-16 00:14:19 +04:00
btrfs_set_header_nritems ( left , old_left_nritems + push_items ) ;
2007-10-16 00:15:53 +04:00
if ( left - > map_token ) {
unmap_extent_buffer ( left , left - > map_token , KM_USER1 ) ;
left - > map_token = NULL ;
}
2007-01-26 23:51:26 +03:00
/* fixup right node */
2007-11-07 21:31:03 +03:00
if ( push_items > right_nritems ) {
2009-01-06 05:25:51 +03:00
printk ( KERN_CRIT " push items %d nr %u \n " , push_items ,
right_nritems ) ;
2007-11-07 21:31:03 +03:00
WARN_ON ( 1 ) ;
}
if ( push_items < right_nritems ) {
push_space = btrfs_item_offset_nr ( right , push_items - 1 ) -
leaf_data_end ( root , right ) ;
memmove_extent_buffer ( right , btrfs_leaf_data ( right ) +
BTRFS_LEAF_DATA_SIZE ( root ) - push_space ,
btrfs_leaf_data ( right ) +
leaf_data_end ( root , right ) , push_space ) ;
memmove_extent_buffer ( right , btrfs_item_nr_offset ( 0 ) ,
2007-10-16 00:14:19 +04:00
btrfs_item_nr_offset ( push_items ) ,
( btrfs_header_nritems ( right ) - push_items ) *
sizeof ( struct btrfs_item ) ) ;
2007-11-07 21:31:03 +03:00
}
2007-11-26 18:58:13 +03:00
right_nritems - = push_items ;
btrfs_set_header_nritems ( right , right_nritems ) ;
2007-03-14 21:14:43 +03:00
push_space = BTRFS_LEAF_DATA_SIZE ( root ) ;
2007-10-16 00:14:19 +04:00
for ( i = 0 ; i < right_nritems ; i + + ) {
item = btrfs_item_nr ( right , i ) ;
2007-10-16 00:15:53 +04:00
if ( ! right - > map_token ) {
map_extent_buffer ( right , ( unsigned long ) item ,
sizeof ( struct btrfs_item ) ,
& right - > map_token , & right - > kaddr ,
& right - > map_start , & right - > map_len ,
KM_USER1 ) ;
}
push_space = push_space - btrfs_item_size ( right , item ) ;
btrfs_set_item_offset ( right , item , push_space ) ;
}
if ( right - > map_token ) {
unmap_extent_buffer ( right , right - > map_token , KM_USER1 ) ;
right - > map_token = NULL ;
2007-01-26 23:51:26 +03:00
}
2007-02-02 17:18:22 +03:00
2007-10-16 00:14:19 +04:00
btrfs_mark_buffer_dirty ( left ) ;
2007-11-07 21:31:03 +03:00
if ( right_nritems )
btrfs_mark_buffer_dirty ( right ) ;
2010-05-16 18:46:25 +04:00
else
clean_tree_block ( trans , root , right ) ;
2007-05-11 19:33:21 +04:00
2007-10-16 00:14:19 +04:00
btrfs_item_key ( right , & disk_key , 0 ) ;
wret = fixup_low_keys ( trans , root , path , & disk_key , 1 ) ;
2007-03-01 00:35:06 +03:00
if ( wret )
ret = wret ;
2007-01-26 23:51:26 +03:00
/* then fixup the leaf pointer in the path */
if ( path - > slots [ 0 ] < push_items ) {
path - > slots [ 0 ] + = old_left_nritems ;
2008-06-26 00:01:30 +04:00
btrfs_tree_unlock ( path - > nodes [ 0 ] ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( path - > nodes [ 0 ] ) ;
path - > nodes [ 0 ] = left ;
2007-01-26 23:51:26 +03:00
path - > slots [ 1 ] - = 1 ;
} else {
2008-06-26 00:01:30 +04:00
btrfs_tree_unlock ( left ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( left ) ;
2007-01-26 23:51:26 +03:00
path - > slots [ 0 ] - = push_items ;
}
2007-02-02 17:18:22 +03:00
BUG_ON ( path - > slots [ 0 ] < 0 ) ;
2007-03-01 00:35:06 +03:00
return ret ;
2008-06-26 00:01:30 +04:00
out :
btrfs_tree_unlock ( left ) ;
free_extent_buffer ( left ) ;
return ret ;
2007-01-26 23:51:26 +03:00
}
2009-03-13 17:04:31 +03:00
/*
* push some data in the path leaf to the left , trying to free up at
* least data_size bytes . returns zero if the push worked , nonzero otherwise
2010-07-07 18:51:48 +04:00
*
* max_slot can put a limit on how far into the leaf we ' ll push items . The
* item at ' max_slot ' won ' t be touched . Use ( u32 ) - 1 to make us push all the
* items
2009-03-13 17:04:31 +03:00
*/
static int push_leaf_left ( struct btrfs_trans_handle * trans , struct btrfs_root
2010-07-07 18:51:48 +04:00
* root , struct btrfs_path * path , int min_data_size ,
int data_size , int empty , u32 max_slot )
2009-03-13 17:04:31 +03:00
{
struct extent_buffer * right = path - > nodes [ 0 ] ;
struct extent_buffer * left ;
int slot ;
int free_space ;
u32 right_nritems ;
int ret = 0 ;
slot = path - > slots [ 1 ] ;
if ( slot = = 0 )
return 1 ;
if ( ! path - > nodes [ 1 ] )
return 1 ;
right_nritems = btrfs_header_nritems ( right ) ;
if ( right_nritems = = 0 )
return 1 ;
btrfs_assert_tree_locked ( path - > nodes [ 1 ] ) ;
left = read_node_slot ( root , path - > nodes [ 1 ] , slot - 1 ) ;
2011-01-05 05:32:22 +03:00
if ( left = = NULL )
return 1 ;
2009-03-13 17:04:31 +03:00
btrfs_tree_lock ( left ) ;
btrfs_set_lock_blocking ( left ) ;
free_space = btrfs_leaf_free_space ( root , left ) ;
if ( free_space < data_size ) {
ret = 1 ;
goto out ;
}
/* cow and double check */
ret = btrfs_cow_block ( trans , root , left ,
path - > nodes [ 1 ] , slot - 1 , & left ) ;
if ( ret ) {
/* we hit -ENOSPC, but it isn't fatal here */
ret = 1 ;
goto out ;
}
free_space = btrfs_leaf_free_space ( root , left ) ;
if ( free_space < data_size ) {
ret = 1 ;
goto out ;
}
2010-07-07 18:51:48 +04:00
return __push_leaf_left ( trans , root , path , min_data_size ,
empty , left , free_space , right_nritems ,
max_slot ) ;
2009-03-13 17:04:31 +03:00
out :
btrfs_tree_unlock ( left ) ;
free_extent_buffer ( left ) ;
return ret ;
}
/*
* split the path ' s leaf in two , making sure there is at least data_size
* available for the resulting leaf level of the path .
*
* returns 0 if all went well and < 0 on failure .
*/
static noinline int copy_for_split ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct btrfs_path * path ,
struct extent_buffer * l ,
struct extent_buffer * right ,
int slot , int mid , int nritems )
{
int data_copy_size ;
int rt_data_off ;
int i ;
int ret = 0 ;
int wret ;
struct btrfs_disk_key disk_key ;
nritems = nritems - mid ;
btrfs_set_header_nritems ( right , nritems ) ;
data_copy_size = btrfs_item_end_nr ( l , mid ) - leaf_data_end ( root , l ) ;
copy_extent_buffer ( right , l , btrfs_item_nr_offset ( 0 ) ,
btrfs_item_nr_offset ( mid ) ,
nritems * sizeof ( struct btrfs_item ) ) ;
copy_extent_buffer ( right , l ,
btrfs_leaf_data ( right ) + BTRFS_LEAF_DATA_SIZE ( root ) -
data_copy_size , btrfs_leaf_data ( l ) +
leaf_data_end ( root , l ) , data_copy_size ) ;
rt_data_off = BTRFS_LEAF_DATA_SIZE ( root ) -
btrfs_item_end_nr ( l , mid ) ;
for ( i = 0 ; i < nritems ; i + + ) {
struct btrfs_item * item = btrfs_item_nr ( right , i ) ;
u32 ioff ;
if ( ! right - > map_token ) {
map_extent_buffer ( right , ( unsigned long ) item ,
sizeof ( struct btrfs_item ) ,
& right - > map_token , & right - > kaddr ,
& right - > map_start , & right - > map_len ,
KM_USER1 ) ;
}
ioff = btrfs_item_offset ( right , item ) ;
btrfs_set_item_offset ( right , item , ioff + rt_data_off ) ;
}
if ( right - > map_token ) {
unmap_extent_buffer ( right , right - > map_token , KM_USER1 ) ;
right - > map_token = NULL ;
}
btrfs_set_header_nritems ( l , mid ) ;
ret = 0 ;
btrfs_item_key ( right , & disk_key , 0 ) ;
wret = insert_ptr ( trans , root , path , & disk_key , right - > start ,
path - > slots [ 1 ] + 1 , 1 ) ;
if ( wret )
ret = wret ;
btrfs_mark_buffer_dirty ( right ) ;
btrfs_mark_buffer_dirty ( l ) ;
BUG_ON ( path - > slots [ 0 ] ! = slot ) ;
if ( mid < = slot ) {
btrfs_tree_unlock ( path - > nodes [ 0 ] ) ;
free_extent_buffer ( path - > nodes [ 0 ] ) ;
path - > nodes [ 0 ] = right ;
path - > slots [ 0 ] - = mid ;
path - > slots [ 1 ] + = 1 ;
} else {
btrfs_tree_unlock ( right ) ;
free_extent_buffer ( right ) ;
}
BUG_ON ( path - > slots [ 0 ] < 0 ) ;
return ret ;
}
2010-07-07 18:51:48 +04:00
/*
* double splits happen when we need to insert a big item in the middle
* of a leaf . A double split can leave us with 3 mostly empty leaves :
* leaf : [ slots 0 - N ] [ our target ] [ N + 1 - total in leaf ]
* A B C
*
* We avoid this by trying to push the items on either side of our target
* into the adjacent leaves . If all goes well we can avoid the double split
* completely .
*/
static noinline int push_for_double_split ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct btrfs_path * path ,
int data_size )
{
int ret ;
int progress = 0 ;
int slot ;
u32 nritems ;
slot = path - > slots [ 0 ] ;
/*
* try to push all the items after our slot into the
* right leaf
*/
ret = push_leaf_right ( trans , root , path , 1 , data_size , 0 , slot ) ;
if ( ret < 0 )
return ret ;
if ( ret = = 0 )
progress + + ;
nritems = btrfs_header_nritems ( path - > nodes [ 0 ] ) ;
/*
* our goal is to get our slot at the start or end of a leaf . If
* we ' ve done so we ' re done
*/
if ( path - > slots [ 0 ] = = 0 | | path - > slots [ 0 ] = = nritems )
return 0 ;
if ( btrfs_leaf_free_space ( root , path - > nodes [ 0 ] ) > = data_size )
return 0 ;
/* try to push all the items before our slot into the next leaf */
slot = path - > slots [ 0 ] ;
ret = push_leaf_left ( trans , root , path , 1 , data_size , 0 , slot ) ;
if ( ret < 0 )
return ret ;
if ( ret = = 0 )
progress + + ;
if ( progress )
return 0 ;
return 1 ;
}
2007-02-02 19:05:29 +03:00
/*
* split the path ' s leaf in two , making sure there is at least data_size
* available for the resulting leaf level of the path .
2007-03-01 00:35:06 +03:00
*
* returns 0 if all went well and < 0 on failure .
2007-02-02 19:05:29 +03:00
*/
2008-09-06 00:13:11 +04:00
static noinline int split_leaf ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct btrfs_key * ins_key ,
struct btrfs_path * path , int data_size ,
int extend )
2007-01-26 23:51:26 +03:00
{
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
struct btrfs_disk_key disk_key ;
2007-10-16 00:14:19 +04:00
struct extent_buffer * l ;
2007-03-12 19:01:18 +03:00
u32 nritems ;
2007-02-02 17:18:22 +03:00
int mid ;
int slot ;
2007-10-16 00:14:19 +04:00
struct extent_buffer * right ;
2007-04-04 22:08:15 +04:00
int ret = 0 ;
2007-03-01 00:35:06 +03:00
int wret ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
int split ;
2007-10-25 23:42:57 +04:00
int num_doubles = 0 ;
2010-07-07 18:51:48 +04:00
int tried_avoid_double = 0 ;
2007-03-01 00:35:06 +03:00
2009-09-24 17:17:31 +04:00
l = path - > nodes [ 0 ] ;
slot = path - > slots [ 0 ] ;
if ( extend & & data_size + btrfs_item_size_nr ( l , slot ) +
sizeof ( struct btrfs_item ) > BTRFS_LEAF_DATA_SIZE ( root ) )
return - EOVERFLOW ;
2007-03-17 21:29:23 +03:00
/* first try to make some room by pushing left and right */
2010-07-07 18:51:48 +04:00
if ( data_size ) {
wret = push_leaf_right ( trans , root , path , data_size ,
data_size , 0 , 0 ) ;
2009-01-06 05:25:51 +03:00
if ( wret < 0 )
2007-03-13 18:17:52 +03:00
return wret ;
2007-10-19 17:23:27 +04:00
if ( wret ) {
2010-07-07 18:51:48 +04:00
wret = push_leaf_left ( trans , root , path , data_size ,
data_size , 0 , ( u32 ) - 1 ) ;
2007-10-19 17:23:27 +04:00
if ( wret < 0 )
return wret ;
}
l = path - > nodes [ 0 ] ;
2007-03-01 00:35:06 +03:00
2007-10-19 17:23:27 +04:00
/* did the pushes work? */
2008-12-17 18:21:48 +03:00
if ( btrfs_leaf_free_space ( root , l ) > = data_size )
2007-10-19 17:23:27 +04:00
return 0 ;
2007-10-16 00:18:25 +04:00
}
2007-03-01 00:35:06 +03:00
2007-02-22 19:39:13 +03:00
if ( ! path - > nodes [ 1 ] ) {
2007-03-16 23:20:31 +03:00
ret = insert_new_root ( trans , root , path , 1 ) ;
2007-02-22 19:39:13 +03:00
if ( ret )
return ret ;
}
2007-10-25 23:42:57 +04:00
again :
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
split = 1 ;
2007-10-25 23:42:57 +04:00
l = path - > nodes [ 0 ] ;
2007-02-02 17:18:22 +03:00
slot = path - > slots [ 0 ] ;
2007-10-16 00:14:19 +04:00
nritems = btrfs_header_nritems ( l ) ;
2009-01-06 05:25:51 +03:00
mid = ( nritems + 1 ) / 2 ;
2007-06-22 22:16:25 +04:00
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
if ( mid < = slot ) {
if ( nritems = = 1 | |
leaf_space_used ( l , mid , nritems - mid ) + data_size >
BTRFS_LEAF_DATA_SIZE ( root ) ) {
if ( slot > = nritems ) {
split = 0 ;
} else {
mid = slot ;
if ( mid ! = nritems & &
leaf_space_used ( l , mid , nritems - mid ) +
data_size > BTRFS_LEAF_DATA_SIZE ( root ) ) {
2010-07-07 18:51:48 +04:00
if ( data_size & & ! tried_avoid_double )
goto push_for_double ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
split = 2 ;
}
}
}
} else {
if ( leaf_space_used ( l , 0 , mid ) + data_size >
BTRFS_LEAF_DATA_SIZE ( root ) ) {
if ( ! extend & & data_size & & slot = = 0 ) {
split = 0 ;
} else if ( ( extend | | ! data_size ) & & slot = = 0 ) {
mid = 1 ;
} else {
mid = slot ;
if ( mid ! = nritems & &
leaf_space_used ( l , mid , nritems - mid ) +
data_size > BTRFS_LEAF_DATA_SIZE ( root ) ) {
2010-07-07 18:51:48 +04:00
if ( data_size & & ! tried_avoid_double )
goto push_for_double ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
split = 2 ;
}
}
}
}
if ( split = = 0 )
btrfs_cpu_key_to_disk ( & disk_key , ins_key ) ;
else
btrfs_item_key ( l , & disk_key , mid ) ;
right = btrfs_alloc_free_block ( trans , root , root - > leafsize , 0 ,
2008-09-23 21:14:14 +04:00
root - > root_key . objectid ,
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
& disk_key , 0 , l - > start , 0 ) ;
2010-05-16 18:46:25 +04:00
if ( IS_ERR ( right ) )
2007-10-16 00:14:19 +04:00
return PTR_ERR ( right ) ;
2010-05-16 18:46:25 +04:00
root_add_used ( root , root - > leafsize ) ;
2007-10-16 00:14:19 +04:00
memset_extent_buffer ( right , 0 , 0 , sizeof ( struct btrfs_header ) ) ;
2007-10-16 00:15:53 +04:00
btrfs_set_header_bytenr ( right , right - > start ) ;
2007-10-16 00:14:19 +04:00
btrfs_set_header_generation ( right , trans - > transid ) ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
btrfs_set_header_backref_rev ( right , BTRFS_MIXED_BACKREF_REV ) ;
2007-10-16 00:14:19 +04:00
btrfs_set_header_owner ( right , root - > root_key . objectid ) ;
btrfs_set_header_level ( right , 0 ) ;
write_extent_buffer ( right , root - > fs_info - > fsid ,
( unsigned long ) btrfs_header_fsid ( right ) ,
BTRFS_FSID_SIZE ) ;
2008-04-15 23:41:47 +04:00
write_extent_buffer ( right , root - > fs_info - > chunk_tree_uuid ,
( unsigned long ) btrfs_header_chunk_tree_uuid ( right ) ,
BTRFS_UUID_SIZE ) ;
2009-03-13 17:04:31 +03:00
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
if ( split = = 0 ) {
if ( mid < = slot ) {
btrfs_set_header_nritems ( right , 0 ) ;
wret = insert_ptr ( trans , root , path ,
& disk_key , right - > start ,
path - > slots [ 1 ] + 1 , 1 ) ;
if ( wret )
ret = wret ;
2008-06-26 00:01:30 +04:00
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
btrfs_tree_unlock ( path - > nodes [ 0 ] ) ;
free_extent_buffer ( path - > nodes [ 0 ] ) ;
path - > nodes [ 0 ] = right ;
path - > slots [ 0 ] = 0 ;
path - > slots [ 1 ] + = 1 ;
} else {
btrfs_set_header_nritems ( right , 0 ) ;
wret = insert_ptr ( trans , root , path ,
& disk_key ,
right - > start ,
path - > slots [ 1 ] , 1 ) ;
if ( wret )
ret = wret ;
btrfs_tree_unlock ( path - > nodes [ 0 ] ) ;
free_extent_buffer ( path - > nodes [ 0 ] ) ;
path - > nodes [ 0 ] = right ;
path - > slots [ 0 ] = 0 ;
if ( path - > slots [ 1 ] = = 0 ) {
wret = fixup_low_keys ( trans , root ,
path , & disk_key , 1 ) ;
2007-04-04 22:08:15 +04:00
if ( wret )
ret = wret ;
2007-10-19 22:01:21 +04:00
}
2007-04-04 22:08:15 +04:00
}
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
btrfs_mark_buffer_dirty ( right ) ;
return ret ;
2007-04-04 22:08:15 +04:00
}
2007-02-02 19:05:29 +03:00
2009-03-13 17:04:31 +03:00
ret = copy_for_split ( trans , root , path , l , right , slot , mid , nritems ) ;
2008-09-23 21:14:14 +04:00
BUG_ON ( ret ) ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
if ( split = = 2 ) {
2007-10-25 23:42:57 +04:00
BUG_ON ( num_doubles ! = 0 ) ;
num_doubles + + ;
goto again ;
2007-04-19 00:15:28 +04:00
}
2009-03-13 17:04:31 +03:00
2007-01-26 23:51:26 +03:00
return ret ;
2010-07-07 18:51:48 +04:00
push_for_double :
push_for_double_split ( trans , root , path , data_size ) ;
tried_avoid_double = 1 ;
if ( btrfs_leaf_free_space ( root , path - > nodes [ 0 ] ) > = data_size )
return 0 ;
goto again ;
2007-01-26 23:51:26 +03:00
}
2009-11-12 12:33:58 +03:00
static noinline int setup_leaf_for_split ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct btrfs_path * path , int ins_len )
2008-12-10 17:10:46 +03:00
{
2009-11-12 12:33:58 +03:00
struct btrfs_key key ;
2008-12-10 17:10:46 +03:00
struct extent_buffer * leaf ;
2009-11-12 12:33:58 +03:00
struct btrfs_file_extent_item * fi ;
u64 extent_len = 0 ;
u32 item_size ;
int ret ;
2008-12-10 17:10:46 +03:00
leaf = path - > nodes [ 0 ] ;
2009-11-12 12:33:58 +03:00
btrfs_item_key_to_cpu ( leaf , & key , path - > slots [ 0 ] ) ;
BUG_ON ( key . type ! = BTRFS_EXTENT_DATA_KEY & &
key . type ! = BTRFS_EXTENT_CSUM_KEY ) ;
if ( btrfs_leaf_free_space ( root , leaf ) > = ins_len )
return 0 ;
2008-12-10 17:10:46 +03:00
item_size = btrfs_item_size_nr ( leaf , path - > slots [ 0 ] ) ;
2009-11-12 12:33:58 +03:00
if ( key . type = = BTRFS_EXTENT_DATA_KEY ) {
fi = btrfs_item_ptr ( leaf , path - > slots [ 0 ] ,
struct btrfs_file_extent_item ) ;
extent_len = btrfs_file_extent_num_bytes ( leaf , fi ) ;
}
2011-04-21 03:20:15 +04:00
btrfs_release_path ( path ) ;
2008-12-10 17:10:46 +03:00
path - > keep_locks = 1 ;
2009-11-12 12:33:58 +03:00
path - > search_for_split = 1 ;
ret = btrfs_search_slot ( trans , root , & key , path , 0 , 1 ) ;
2008-12-10 17:10:46 +03:00
path - > search_for_split = 0 ;
2009-11-12 12:33:58 +03:00
if ( ret < 0 )
goto err ;
2008-12-10 17:10:46 +03:00
2009-11-12 12:33:58 +03:00
ret = - EAGAIN ;
leaf = path - > nodes [ 0 ] ;
2008-12-10 17:10:46 +03:00
/* if our item isn't there or got smaller, return now */
2009-11-12 12:33:58 +03:00
if ( ret > 0 | | item_size ! = btrfs_item_size_nr ( leaf , path - > slots [ 0 ] ) )
goto err ;
2010-04-02 17:20:18 +04:00
/* the leaf has changed, it now has room. return now */
if ( btrfs_leaf_free_space ( root , path - > nodes [ 0 ] ) > = ins_len )
goto err ;
2009-11-12 12:33:58 +03:00
if ( key . type = = BTRFS_EXTENT_DATA_KEY ) {
fi = btrfs_item_ptr ( leaf , path - > slots [ 0 ] ,
struct btrfs_file_extent_item ) ;
if ( extent_len ! = btrfs_file_extent_num_bytes ( leaf , fi ) )
goto err ;
2008-12-10 17:10:46 +03:00
}
2009-03-13 18:00:37 +03:00
btrfs_set_path_blocking ( path ) ;
2009-11-12 12:33:58 +03:00
ret = split_leaf ( trans , root , & key , path , ins_len , 1 ) ;
2010-05-16 18:46:25 +04:00
if ( ret )
goto err ;
2008-12-10 17:10:46 +03:00
2009-11-12 12:33:58 +03:00
path - > keep_locks = 0 ;
2009-03-13 18:00:37 +03:00
btrfs_unlock_up_safe ( path , 1 ) ;
2009-11-12 12:33:58 +03:00
return 0 ;
err :
path - > keep_locks = 0 ;
return ret ;
}
static noinline int split_item ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct btrfs_path * path ,
struct btrfs_key * new_key ,
unsigned long split_offset )
{
struct extent_buffer * leaf ;
struct btrfs_item * item ;
struct btrfs_item * new_item ;
int slot ;
char * buf ;
u32 nritems ;
u32 item_size ;
u32 orig_offset ;
struct btrfs_disk_key disk_key ;
2009-03-13 18:00:37 +03:00
leaf = path - > nodes [ 0 ] ;
BUG_ON ( btrfs_leaf_free_space ( root , leaf ) < sizeof ( struct btrfs_item ) ) ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
btrfs_set_path_blocking ( path ) ;
2008-12-10 17:10:46 +03:00
item = btrfs_item_nr ( leaf , path - > slots [ 0 ] ) ;
orig_offset = btrfs_item_offset ( leaf , item ) ;
item_size = btrfs_item_size ( leaf , item ) ;
buf = kmalloc ( item_size , GFP_NOFS ) ;
2009-11-12 12:33:58 +03:00
if ( ! buf )
return - ENOMEM ;
2008-12-10 17:10:46 +03:00
read_extent_buffer ( leaf , buf , btrfs_item_ptr_offset ( leaf ,
path - > slots [ 0 ] ) , item_size ) ;
2009-11-12 12:33:58 +03:00
slot = path - > slots [ 0 ] + 1 ;
2008-12-10 17:10:46 +03:00
nritems = btrfs_header_nritems ( leaf ) ;
if ( slot ! = nritems ) {
/* shift the items */
memmove_extent_buffer ( leaf , btrfs_item_nr_offset ( slot + 1 ) ,
2009-11-12 12:33:58 +03:00
btrfs_item_nr_offset ( slot ) ,
( nritems - slot ) * sizeof ( struct btrfs_item ) ) ;
2008-12-10 17:10:46 +03:00
}
btrfs_cpu_key_to_disk ( & disk_key , new_key ) ;
btrfs_set_item_key ( leaf , & disk_key , slot ) ;
new_item = btrfs_item_nr ( leaf , slot ) ;
btrfs_set_item_offset ( leaf , new_item , orig_offset ) ;
btrfs_set_item_size ( leaf , new_item , item_size - split_offset ) ;
btrfs_set_item_offset ( leaf , item ,
orig_offset + item_size - split_offset ) ;
btrfs_set_item_size ( leaf , item , split_offset ) ;
btrfs_set_header_nritems ( leaf , nritems + 1 ) ;
/* write the data for the start of the original item */
write_extent_buffer ( leaf , buf ,
btrfs_item_ptr_offset ( leaf , path - > slots [ 0 ] ) ,
split_offset ) ;
/* write the data for the new item */
write_extent_buffer ( leaf , buf + split_offset ,
btrfs_item_ptr_offset ( leaf , slot ) ,
item_size - split_offset ) ;
btrfs_mark_buffer_dirty ( leaf ) ;
2009-11-12 12:33:58 +03:00
BUG_ON ( btrfs_leaf_free_space ( root , leaf ) < 0 ) ;
2008-12-10 17:10:46 +03:00
kfree ( buf ) ;
2009-11-12 12:33:58 +03:00
return 0 ;
}
/*
* This function splits a single item into two items ,
* giving ' new_key ' to the new item and splitting the
* old one at split_offset ( from the start of the item ) .
*
* The path may be released by this operation . After
* the split , the path is pointing to the old item . The
* new item is going to be in the same node as the old one .
*
* Note , the item being split must be smaller enough to live alone on
* a tree block with room for one extra struct btrfs_item
*
* This allows us to split the item in place , keeping a lock on the
* leaf the entire time .
*/
int btrfs_split_item ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct btrfs_path * path ,
struct btrfs_key * new_key ,
unsigned long split_offset )
{
int ret ;
ret = setup_leaf_for_split ( trans , root , path ,
sizeof ( struct btrfs_item ) ) ;
if ( ret )
return ret ;
ret = split_item ( trans , root , path , new_key , split_offset ) ;
2008-12-10 17:10:46 +03:00
return ret ;
}
2009-11-12 12:33:58 +03:00
/*
* This function duplicate a item , giving ' new_key ' to the new item .
* It guarantees both items live in the same tree leaf and the new item
* is contiguous with the original item .
*
* This allows us to split file extent in place , keeping a lock on the
* leaf the entire time .
*/
int btrfs_duplicate_item ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct btrfs_path * path ,
struct btrfs_key * new_key )
{
struct extent_buffer * leaf ;
int ret ;
u32 item_size ;
leaf = path - > nodes [ 0 ] ;
item_size = btrfs_item_size_nr ( leaf , path - > slots [ 0 ] ) ;
ret = setup_leaf_for_split ( trans , root , path ,
item_size + sizeof ( struct btrfs_item ) ) ;
if ( ret )
return ret ;
path - > slots [ 0 ] + + ;
ret = setup_items_for_insert ( trans , root , path , new_key , & item_size ,
item_size , item_size +
sizeof ( struct btrfs_item ) , 1 ) ;
BUG_ON ( ret ) ;
leaf = path - > nodes [ 0 ] ;
memcpy_extent_buffer ( leaf ,
btrfs_item_ptr_offset ( leaf , path - > slots [ 0 ] ) ,
btrfs_item_ptr_offset ( leaf , path - > slots [ 0 ] - 1 ) ,
item_size ) ;
return 0 ;
}
2008-09-29 23:18:18 +04:00
/*
* make the item pointed to by the path smaller . new_size indicates
* how small to make it , and from_end tells us if we just chop bytes
* off the end of the item or if we shift the item to chop bytes off
* the front .
*/
2007-04-17 21:26:50 +04:00
int btrfs_truncate_item ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct btrfs_path * path ,
2007-11-01 18:28:41 +03:00
u32 new_size , int from_end )
2007-04-17 21:26:50 +04:00
{
int slot ;
2007-10-16 00:14:19 +04:00
struct extent_buffer * leaf ;
struct btrfs_item * item ;
2007-04-17 21:26:50 +04:00
u32 nritems ;
unsigned int data_end ;
unsigned int old_data_start ;
unsigned int old_size ;
unsigned int size_diff ;
int i ;
2007-10-16 00:14:19 +04:00
leaf = path - > nodes [ 0 ] ;
2007-11-01 18:28:41 +03:00
slot = path - > slots [ 0 ] ;
old_size = btrfs_item_size_nr ( leaf , slot ) ;
if ( old_size = = new_size )
return 0 ;
2007-04-17 21:26:50 +04:00
2007-10-16 00:14:19 +04:00
nritems = btrfs_header_nritems ( leaf ) ;
2007-04-17 21:26:50 +04:00
data_end = leaf_data_end ( root , leaf ) ;
2007-10-16 00:14:19 +04:00
old_data_start = btrfs_item_offset_nr ( leaf , slot ) ;
2007-11-01 18:28:41 +03:00
2007-04-17 21:26:50 +04:00
size_diff = old_size - new_size ;
BUG_ON ( slot < 0 ) ;
BUG_ON ( slot > = nritems ) ;
/*
* item0 . . itemN . . . dataN . offset . . dataN . size . . data0 . size
*/
/* first correct the data pointers */
for ( i = slot ; i < nritems ; i + + ) {
2007-10-16 00:14:19 +04:00
u32 ioff ;
item = btrfs_item_nr ( leaf , i ) ;
2007-10-16 00:15:53 +04:00
if ( ! leaf - > map_token ) {
map_extent_buffer ( leaf , ( unsigned long ) item ,
sizeof ( struct btrfs_item ) ,
& leaf - > map_token , & leaf - > kaddr ,
& leaf - > map_start , & leaf - > map_len ,
KM_USER1 ) ;
}
2007-10-16 00:14:19 +04:00
ioff = btrfs_item_offset ( leaf , item ) ;
btrfs_set_item_offset ( leaf , item , ioff + size_diff ) ;
2007-04-17 21:26:50 +04:00
}
2007-10-16 00:15:53 +04:00
if ( leaf - > map_token ) {
unmap_extent_buffer ( leaf , leaf - > map_token , KM_USER1 ) ;
leaf - > map_token = NULL ;
}
2007-04-17 21:26:50 +04:00
/* shift the data */
2007-11-01 18:28:41 +03:00
if ( from_end ) {
memmove_extent_buffer ( leaf , btrfs_leaf_data ( leaf ) +
data_end + size_diff , btrfs_leaf_data ( leaf ) +
data_end , old_data_start + new_size - data_end ) ;
} else {
struct btrfs_disk_key disk_key ;
u64 offset ;
btrfs_item_key ( leaf , & disk_key , slot ) ;
if ( btrfs_disk_key_type ( & disk_key ) = = BTRFS_EXTENT_DATA_KEY ) {
unsigned long ptr ;
struct btrfs_file_extent_item * fi ;
fi = btrfs_item_ptr ( leaf , slot ,
struct btrfs_file_extent_item ) ;
fi = ( struct btrfs_file_extent_item * ) (
( unsigned long ) fi - size_diff ) ;
if ( btrfs_file_extent_type ( leaf , fi ) = =
BTRFS_FILE_EXTENT_INLINE ) {
ptr = btrfs_item_ptr_offset ( leaf , slot ) ;
memmove_extent_buffer ( leaf , ptr ,
2009-01-06 05:25:51 +03:00
( unsigned long ) fi ,
offsetof ( struct btrfs_file_extent_item ,
2007-11-01 18:28:41 +03:00
disk_bytenr ) ) ;
}
}
memmove_extent_buffer ( leaf , btrfs_leaf_data ( leaf ) +
data_end + size_diff , btrfs_leaf_data ( leaf ) +
data_end , old_data_start - data_end ) ;
offset = btrfs_disk_key_offset ( & disk_key ) ;
btrfs_set_disk_key_offset ( & disk_key , offset + size_diff ) ;
btrfs_set_item_key ( leaf , & disk_key , slot ) ;
if ( slot = = 0 )
fixup_low_keys ( trans , root , path , & disk_key , 1 ) ;
}
2007-10-16 00:14:19 +04:00
item = btrfs_item_nr ( leaf , slot ) ;
btrfs_set_item_size ( leaf , item , new_size ) ;
btrfs_mark_buffer_dirty ( leaf ) ;
2007-04-17 21:26:50 +04:00
2007-10-16 00:14:19 +04:00
if ( btrfs_leaf_free_space ( root , leaf ) < 0 ) {
btrfs_print_leaf ( root , leaf ) ;
2007-04-17 21:26:50 +04:00
BUG ( ) ;
2007-10-16 00:14:19 +04:00
}
2011-05-19 09:19:08 +04:00
return 0 ;
2007-04-17 21:26:50 +04:00
}
2008-09-29 23:18:18 +04:00
/*
* make the item pointed to by the path bigger , data_size is the new size .
*/
2007-10-16 00:14:19 +04:00
int btrfs_extend_item ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root , struct btrfs_path * path ,
u32 data_size )
2007-04-16 17:22:45 +04:00
{
int slot ;
2007-10-16 00:14:19 +04:00
struct extent_buffer * leaf ;
struct btrfs_item * item ;
2007-04-16 17:22:45 +04:00
u32 nritems ;
unsigned int data_end ;
unsigned int old_data ;
unsigned int old_size ;
int i ;
2007-10-16 00:14:19 +04:00
leaf = path - > nodes [ 0 ] ;
2007-04-16 17:22:45 +04:00
2007-10-16 00:14:19 +04:00
nritems = btrfs_header_nritems ( leaf ) ;
2007-04-16 17:22:45 +04:00
data_end = leaf_data_end ( root , leaf ) ;
2007-10-16 00:14:19 +04:00
if ( btrfs_leaf_free_space ( root , leaf ) < data_size ) {
btrfs_print_leaf ( root , leaf ) ;
2007-04-16 17:22:45 +04:00
BUG ( ) ;
2007-10-16 00:14:19 +04:00
}
2007-04-16 17:22:45 +04:00
slot = path - > slots [ 0 ] ;
2007-10-16 00:14:19 +04:00
old_data = btrfs_item_end_nr ( leaf , slot ) ;
2007-04-16 17:22:45 +04:00
BUG_ON ( slot < 0 ) ;
2007-10-16 00:18:25 +04:00
if ( slot > = nritems ) {
btrfs_print_leaf ( root , leaf ) ;
2009-01-06 05:25:51 +03:00
printk ( KERN_CRIT " slot %d too large, nritems %d \n " ,
slot , nritems ) ;
2007-10-16 00:18:25 +04:00
BUG_ON ( 1 ) ;
}
2007-04-16 17:22:45 +04:00
/*
* item0 . . itemN . . . dataN . offset . . dataN . size . . data0 . size
*/
/* first correct the data pointers */
for ( i = slot ; i < nritems ; i + + ) {
2007-10-16 00:14:19 +04:00
u32 ioff ;
item = btrfs_item_nr ( leaf , i ) ;
2007-10-16 00:15:53 +04:00
if ( ! leaf - > map_token ) {
map_extent_buffer ( leaf , ( unsigned long ) item ,
sizeof ( struct btrfs_item ) ,
& leaf - > map_token , & leaf - > kaddr ,
& leaf - > map_start , & leaf - > map_len ,
KM_USER1 ) ;
}
2007-10-16 00:14:19 +04:00
ioff = btrfs_item_offset ( leaf , item ) ;
btrfs_set_item_offset ( leaf , item , ioff - data_size ) ;
2007-04-16 17:22:45 +04:00
}
2007-10-16 00:14:19 +04:00
2007-10-16 00:15:53 +04:00
if ( leaf - > map_token ) {
unmap_extent_buffer ( leaf , leaf - > map_token , KM_USER1 ) ;
leaf - > map_token = NULL ;
}
2007-04-16 17:22:45 +04:00
/* shift the data */
2007-10-16 00:14:19 +04:00
memmove_extent_buffer ( leaf , btrfs_leaf_data ( leaf ) +
2007-04-16 17:22:45 +04:00
data_end - data_size , btrfs_leaf_data ( leaf ) +
data_end , old_data - data_end ) ;
2007-10-16 00:14:19 +04:00
2007-04-16 17:22:45 +04:00
data_end = old_data ;
2007-10-16 00:14:19 +04:00
old_size = btrfs_item_size_nr ( leaf , slot ) ;
item = btrfs_item_nr ( leaf , slot ) ;
btrfs_set_item_size ( leaf , item , old_size + data_size ) ;
btrfs_mark_buffer_dirty ( leaf ) ;
2007-04-16 17:22:45 +04:00
2007-10-16 00:14:19 +04:00
if ( btrfs_leaf_free_space ( root , leaf ) < 0 ) {
btrfs_print_leaf ( root , leaf ) ;
2007-04-16 17:22:45 +04:00
BUG ( ) ;
2007-10-16 00:14:19 +04:00
}
2011-05-19 09:19:08 +04:00
return 0 ;
2007-04-16 17:22:45 +04:00
}
2008-11-12 22:19:50 +03:00
/*
* Given a key and some data , insert items into the tree .
* This does all the path init required , making room in the tree if needed .
* Returns the number of keys that were inserted .
*/
int btrfs_insert_some_items ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct btrfs_path * path ,
struct btrfs_key * cpu_key , u32 * data_size ,
int nr )
{
struct extent_buffer * leaf ;
struct btrfs_item * item ;
int ret = 0 ;
int slot ;
int i ;
u32 nritems ;
u32 total_data = 0 ;
u32 total_size = 0 ;
unsigned int data_end ;
struct btrfs_disk_key disk_key ;
struct btrfs_key found_key ;
2008-12-17 18:21:48 +03:00
for ( i = 0 ; i < nr ; i + + ) {
if ( total_size + data_size [ i ] + sizeof ( struct btrfs_item ) >
BTRFS_LEAF_DATA_SIZE ( root ) ) {
break ;
nr = i ;
}
2008-11-12 22:19:50 +03:00
total_data + = data_size [ i ] ;
2008-12-17 18:21:48 +03:00
total_size + = data_size [ i ] + sizeof ( struct btrfs_item ) ;
}
BUG_ON ( nr = = 0 ) ;
2008-11-12 22:19:50 +03:00
ret = btrfs_search_slot ( trans , root , cpu_key , path , total_size , 1 ) ;
if ( ret = = 0 )
return - EEXIST ;
if ( ret < 0 )
goto out ;
leaf = path - > nodes [ 0 ] ;
nritems = btrfs_header_nritems ( leaf ) ;
data_end = leaf_data_end ( root , leaf ) ;
if ( btrfs_leaf_free_space ( root , leaf ) < total_size ) {
for ( i = nr ; i > = 0 ; i - - ) {
total_data - = data_size [ i ] ;
total_size - = data_size [ i ] + sizeof ( struct btrfs_item ) ;
if ( total_size < btrfs_leaf_free_space ( root , leaf ) )
break ;
}
nr = i ;
}
slot = path - > slots [ 0 ] ;
BUG_ON ( slot < 0 ) ;
if ( slot ! = nritems ) {
unsigned int old_data = btrfs_item_end_nr ( leaf , slot ) ;
item = btrfs_item_nr ( leaf , slot ) ;
btrfs_item_key_to_cpu ( leaf , & found_key , slot ) ;
/* figure out how many keys we can insert in here */
total_data = data_size [ 0 ] ;
for ( i = 1 ; i < nr ; i + + ) {
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
if ( btrfs_comp_cpu_keys ( & found_key , cpu_key + i ) < = 0 )
2008-11-12 22:19:50 +03:00
break ;
total_data + = data_size [ i ] ;
}
nr = i ;
if ( old_data < data_end ) {
btrfs_print_leaf ( root , leaf ) ;
2009-01-06 05:25:51 +03:00
printk ( KERN_CRIT " slot %d old_data %d data_end %d \n " ,
2008-11-12 22:19:50 +03:00
slot , old_data , data_end ) ;
BUG_ON ( 1 ) ;
}
/*
* item0 . . itemN . . . dataN . offset . . dataN . size . . data0 . size
*/
/* first correct the data pointers */
WARN_ON ( leaf - > map_token ) ;
for ( i = slot ; i < nritems ; i + + ) {
u32 ioff ;
item = btrfs_item_nr ( leaf , i ) ;
if ( ! leaf - > map_token ) {
map_extent_buffer ( leaf , ( unsigned long ) item ,
sizeof ( struct btrfs_item ) ,
& leaf - > map_token , & leaf - > kaddr ,
& leaf - > map_start , & leaf - > map_len ,
KM_USER1 ) ;
}
ioff = btrfs_item_offset ( leaf , item ) ;
btrfs_set_item_offset ( leaf , item , ioff - total_data ) ;
}
if ( leaf - > map_token ) {
unmap_extent_buffer ( leaf , leaf - > map_token , KM_USER1 ) ;
leaf - > map_token = NULL ;
}
/* shift the items */
memmove_extent_buffer ( leaf , btrfs_item_nr_offset ( slot + nr ) ,
btrfs_item_nr_offset ( slot ) ,
( nritems - slot ) * sizeof ( struct btrfs_item ) ) ;
/* shift the data */
memmove_extent_buffer ( leaf , btrfs_leaf_data ( leaf ) +
data_end - total_data , btrfs_leaf_data ( leaf ) +
data_end , old_data - data_end ) ;
data_end = old_data ;
} else {
/*
* this sucks but it has to be done , if we are inserting at
* the end of the leaf only insert 1 of the items , since we
* have no way of knowing whats on the next leaf and we ' d have
* to drop our current locks to figure it out
*/
nr = 1 ;
}
/* setup the item for the new data */
for ( i = 0 ; i < nr ; i + + ) {
btrfs_cpu_key_to_disk ( & disk_key , cpu_key + i ) ;
btrfs_set_item_key ( leaf , & disk_key , slot + i ) ;
item = btrfs_item_nr ( leaf , slot + i ) ;
btrfs_set_item_offset ( leaf , item , data_end - data_size [ i ] ) ;
data_end - = data_size [ i ] ;
btrfs_set_item_size ( leaf , item , data_size [ i ] ) ;
}
btrfs_set_header_nritems ( leaf , nritems + nr ) ;
btrfs_mark_buffer_dirty ( leaf ) ;
ret = 0 ;
if ( slot = = 0 ) {
btrfs_cpu_key_to_disk ( & disk_key , cpu_key ) ;
ret = fixup_low_keys ( trans , root , path , & disk_key , 1 ) ;
}
if ( btrfs_leaf_free_space ( root , leaf ) < 0 ) {
btrfs_print_leaf ( root , leaf ) ;
BUG ( ) ;
}
out :
if ( ! ret )
ret = nr ;
return ret ;
}
2007-02-02 19:05:29 +03:00
/*
2009-03-13 17:04:31 +03:00
* this is a helper for btrfs_insert_empty_items , the main goal here is
* to save stack depth by doing the bulk of the work in a function
* that doesn ' t call btrfs_search_slot
2007-02-02 19:05:29 +03:00
*/
btrfs: implement delayed inode items operation
Changelog V5 -> V6:
- Fix oom when the memory load is high, by storing the delayed nodes into the
root's radix tree, and letting btrfs inodes go.
Changelog V4 -> V5:
- Fix the race on adding the delayed node to the inode, which is spotted by
Chris Mason.
- Merge Chris Mason's incremental patch into this patch.
- Fix deadlock between readdir() and memory fault, which is reported by
Itaru Kitayama.
Changelog V3 -> V4:
- Fix nested lock, which is reported by Itaru Kitayama, by updating space cache
inode in time.
Changelog V2 -> V3:
- Fix the race between the delayed worker and the task which does delayed items
balance, which is reported by Tsutomu Itoh.
- Modify the patch address David Sterba's comment.
- Fix the bug of the cpu recursion spinlock, reported by Chris Mason
Changelog V1 -> V2:
- break up the global rb-tree, use a list to manage the delayed nodes,
which is created for every directory and file, and used to manage the
delayed directory name index items and the delayed inode item.
- introduce a worker to deal with the delayed nodes.
Compare with Ext3/4, the performance of file creation and deletion on btrfs
is very poor. the reason is that btrfs must do a lot of b+ tree insertions,
such as inode item, directory name item, directory name index and so on.
If we can do some delayed b+ tree insertion or deletion, we can improve the
performance, so we made this patch which implemented delayed directory name
index insertion/deletion and delayed inode update.
Implementation:
- introduce a delayed root object into the filesystem, that use two lists to
manage the delayed nodes which are created for every file/directory.
One is used to manage all the delayed nodes that have delayed items. And the
other is used to manage the delayed nodes which is waiting to be dealt with
by the work thread.
- Every delayed node has two rb-tree, one is used to manage the directory name
index which is going to be inserted into b+ tree, and the other is used to
manage the directory name index which is going to be deleted from b+ tree.
- introduce a worker to deal with the delayed operation. This worker is used
to deal with the works of the delayed directory name index items insertion
and deletion and the delayed inode update.
When the delayed items is beyond the lower limit, we create works for some
delayed nodes and insert them into the work queue of the worker, and then
go back.
When the delayed items is beyond the upper bound, we create works for all
the delayed nodes that haven't been dealt with, and insert them into the work
queue of the worker, and then wait for that the untreated items is below some
threshold value.
- When we want to insert a directory name index into b+ tree, we just add the
information into the delayed inserting rb-tree.
And then we check the number of the delayed items and do delayed items
balance. (The balance policy is above.)
- When we want to delete a directory name index from the b+ tree, we search it
in the inserting rb-tree at first. If we look it up, just drop it. If not,
add the key of it into the delayed deleting rb-tree.
Similar to the delayed inserting rb-tree, we also check the number of the
delayed items and do delayed items balance.
(The same to inserting manipulation)
- When we want to update the metadata of some inode, we cached the data of the
inode into the delayed node. the worker will flush it into the b+ tree after
dealing with the delayed insertion and deletion.
- We will move the delayed node to the tail of the list after we access the
delayed node, By this way, we can cache more delayed items and merge more
inode updates.
- If we want to commit transaction, we will deal with all the delayed node.
- the delayed node will be freed when we free the btrfs inode.
- Before we log the inode items, we commit all the directory name index items
and the delayed inode update.
I did a quick test by the benchmark tool[1] and found we can improve the
performance of file creation by ~15%, and file deletion by ~20%.
Before applying this patch:
Create files:
Total files: 50000
Total time: 1.096108
Average time: 0.000022
Delete files:
Total files: 50000
Total time: 1.510403
Average time: 0.000030
After applying this patch:
Create files:
Total files: 50000
Total time: 0.932899
Average time: 0.000019
Delete files:
Total files: 50000
Total time: 1.215732
Average time: 0.000024
[1] http://marc.info/?l=linux-btrfs&m=128212635122920&q=p3
Many thanks for Kitayama-san's help!
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Reviewed-by: David Sterba <dave@jikos.cz>
Tested-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Tested-by: Itaru Kitayama <kitayama@cl.bb4u.ne.jp>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2011-04-22 14:12:22 +04:00
int setup_items_for_insert ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root , struct btrfs_path * path ,
struct btrfs_key * cpu_key , u32 * data_size ,
u32 total_data , u32 total_size , int nr )
2007-01-26 23:51:26 +03:00
{
2007-10-16 00:14:19 +04:00
struct btrfs_item * item ;
2008-01-29 23:15:18 +03:00
int i ;
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u32 nritems ;
2007-01-26 23:51:26 +03:00
unsigned int data_end ;
2007-03-12 23:22:34 +03:00
struct btrfs_disk_key disk_key ;
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int ret ;
struct extent_buffer * leaf ;
int slot ;
2007-03-12 23:22:34 +03:00
2007-10-16 00:14:19 +04:00
leaf = path - > nodes [ 0 ] ;
2009-03-13 17:04:31 +03:00
slot = path - > slots [ 0 ] ;
2007-02-02 19:05:29 +03:00
2007-10-16 00:14:19 +04:00
nritems = btrfs_header_nritems ( leaf ) ;
2007-03-14 21:14:43 +03:00
data_end = leaf_data_end ( root , leaf ) ;
2007-02-02 17:18:22 +03:00
2008-09-12 23:32:53 +04:00
if ( btrfs_leaf_free_space ( root , leaf ) < total_size ) {
2007-10-16 00:18:25 +04:00
btrfs_print_leaf ( root , leaf ) ;
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printk ( KERN_CRIT " not enough freespace need %u have %d \n " ,
2008-01-29 23:15:18 +03:00
total_size , btrfs_leaf_free_space ( root , leaf ) ) ;
2007-01-26 23:51:26 +03:00
BUG ( ) ;
2007-04-04 22:08:15 +04:00
}
2007-10-16 00:14:19 +04:00
2007-01-26 23:51:26 +03:00
if ( slot ! = nritems ) {
2007-10-16 00:14:19 +04:00
unsigned int old_data = btrfs_item_end_nr ( leaf , slot ) ;
2007-01-26 23:51:26 +03:00
2007-10-16 00:14:19 +04:00
if ( old_data < data_end ) {
btrfs_print_leaf ( root , leaf ) ;
2009-01-06 05:25:51 +03:00
printk ( KERN_CRIT " slot %d old_data %d data_end %d \n " ,
2007-10-16 00:14:19 +04:00
slot , old_data , data_end ) ;
BUG_ON ( 1 ) ;
}
2007-01-26 23:51:26 +03:00
/*
* item0 . . itemN . . . dataN . offset . . dataN . size . . data0 . size
*/
/* first correct the data pointers */
2007-10-16 00:15:53 +04:00
WARN_ON ( leaf - > map_token ) ;
2007-03-13 03:12:07 +03:00
for ( i = slot ; i < nritems ; i + + ) {
2007-10-16 00:14:19 +04:00
u32 ioff ;
2007-10-16 00:15:53 +04:00
2007-10-16 00:14:19 +04:00
item = btrfs_item_nr ( leaf , i ) ;
2007-10-16 00:15:53 +04:00
if ( ! leaf - > map_token ) {
map_extent_buffer ( leaf , ( unsigned long ) item ,
sizeof ( struct btrfs_item ) ,
& leaf - > map_token , & leaf - > kaddr ,
& leaf - > map_start , & leaf - > map_len ,
KM_USER1 ) ;
}
2007-10-16 00:14:19 +04:00
ioff = btrfs_item_offset ( leaf , item ) ;
2008-01-29 23:15:18 +03:00
btrfs_set_item_offset ( leaf , item , ioff - total_data ) ;
2007-03-13 03:12:07 +03:00
}
2007-10-16 00:15:53 +04:00
if ( leaf - > map_token ) {
unmap_extent_buffer ( leaf , leaf - > map_token , KM_USER1 ) ;
leaf - > map_token = NULL ;
}
2007-01-26 23:51:26 +03:00
/* shift the items */
2008-01-29 23:15:18 +03:00
memmove_extent_buffer ( leaf , btrfs_item_nr_offset ( slot + nr ) ,
2007-10-16 00:14:19 +04:00
btrfs_item_nr_offset ( slot ) ,
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( nritems - slot ) * sizeof ( struct btrfs_item ) ) ;
2007-01-26 23:51:26 +03:00
/* shift the data */
2007-10-16 00:14:19 +04:00
memmove_extent_buffer ( leaf , btrfs_leaf_data ( leaf ) +
2008-01-29 23:15:18 +03:00
data_end - total_data , btrfs_leaf_data ( leaf ) +
2007-03-30 22:27:56 +04:00
data_end , old_data - data_end ) ;
2007-01-26 23:51:26 +03:00
data_end = old_data ;
}
2007-10-16 00:14:19 +04:00
2007-03-15 19:56:47 +03:00
/* setup the item for the new data */
2008-01-29 23:15:18 +03:00
for ( i = 0 ; i < nr ; i + + ) {
btrfs_cpu_key_to_disk ( & disk_key , cpu_key + i ) ;
btrfs_set_item_key ( leaf , & disk_key , slot + i ) ;
item = btrfs_item_nr ( leaf , slot + i ) ;
btrfs_set_item_offset ( leaf , item , data_end - data_size [ i ] ) ;
data_end - = data_size [ i ] ;
btrfs_set_item_size ( leaf , item , data_size [ i ] ) ;
}
2009-03-13 17:04:31 +03:00
2008-01-29 23:15:18 +03:00
btrfs_set_header_nritems ( leaf , nritems + nr ) ;
2007-03-01 00:35:06 +03:00
ret = 0 ;
2008-01-30 19:43:54 +03:00
if ( slot = = 0 ) {
btrfs_cpu_key_to_disk ( & disk_key , cpu_key ) ;
2007-03-16 23:20:31 +03:00
ret = fixup_low_keys ( trans , root , path , & disk_key , 1 ) ;
2008-01-30 19:43:54 +03:00
}
2009-03-13 18:00:37 +03:00
btrfs_unlock_up_safe ( path , 1 ) ;
btrfs_mark_buffer_dirty ( leaf ) ;
2007-03-01 00:35:06 +03:00
2007-10-16 00:14:19 +04:00
if ( btrfs_leaf_free_space ( root , leaf ) < 0 ) {
btrfs_print_leaf ( root , leaf ) ;
2007-01-26 23:51:26 +03:00
BUG ( ) ;
2007-10-16 00:14:19 +04:00
}
2009-03-13 17:04:31 +03:00
return ret ;
}
/*
* Given a key and some data , insert items into the tree .
* This does all the path init required , making room in the tree if needed .
*/
int btrfs_insert_empty_items ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct btrfs_path * path ,
struct btrfs_key * cpu_key , u32 * data_size ,
int nr )
{
int ret = 0 ;
int slot ;
int i ;
u32 total_size = 0 ;
u32 total_data = 0 ;
for ( i = 0 ; i < nr ; i + + )
total_data + = data_size [ i ] ;
total_size = total_data + ( nr * sizeof ( struct btrfs_item ) ) ;
ret = btrfs_search_slot ( trans , root , cpu_key , path , total_size , 1 ) ;
if ( ret = = 0 )
return - EEXIST ;
if ( ret < 0 )
goto out ;
slot = path - > slots [ 0 ] ;
BUG_ON ( slot < 0 ) ;
ret = setup_items_for_insert ( trans , root , path , cpu_key , data_size ,
total_data , total_size , nr ) ;
2007-03-02 02:59:40 +03:00
out :
2007-03-15 19:56:47 +03:00
return ret ;
}
/*
* Given a key and some data , insert an item into the tree .
* This does all the path init required , making room in the tree if needed .
*/
2007-03-16 23:20:31 +03:00
int btrfs_insert_item ( struct btrfs_trans_handle * trans , struct btrfs_root
* root , struct btrfs_key * cpu_key , void * data , u32
data_size )
2007-03-15 19:56:47 +03:00
{
int ret = 0 ;
2007-04-02 18:50:19 +04:00
struct btrfs_path * path ;
2007-10-16 00:14:19 +04:00
struct extent_buffer * leaf ;
unsigned long ptr ;
2007-03-15 19:56:47 +03:00
2007-04-02 18:50:19 +04:00
path = btrfs_alloc_path ( ) ;
2011-03-23 11:14:16 +03:00
if ( ! path )
return - ENOMEM ;
2007-04-02 18:50:19 +04:00
ret = btrfs_insert_empty_item ( trans , root , path , cpu_key , data_size ) ;
2007-03-15 19:56:47 +03:00
if ( ! ret ) {
2007-10-16 00:14:19 +04:00
leaf = path - > nodes [ 0 ] ;
ptr = btrfs_item_ptr_offset ( leaf , path - > slots [ 0 ] ) ;
write_extent_buffer ( leaf , data , ptr , data_size ) ;
btrfs_mark_buffer_dirty ( leaf ) ;
2007-03-15 19:56:47 +03:00
}
2007-04-02 18:50:19 +04:00
btrfs_free_path ( path ) ;
2007-03-01 00:35:06 +03:00
return ret ;
2007-01-26 23:51:26 +03:00
}
2007-02-02 19:05:29 +03:00
/*
2007-02-24 14:24:44 +03:00
* delete the pointer from a given node .
2007-02-02 19:05:29 +03:00
*
2008-09-29 23:18:18 +04:00
* the tree should have been previously balanced so the deletion does not
* empty a node .
2007-02-02 19:05:29 +03:00
*/
2007-03-16 23:20:31 +03:00
static int del_ptr ( struct btrfs_trans_handle * trans , struct btrfs_root * root ,
struct btrfs_path * path , int level , int slot )
2007-01-26 23:51:26 +03:00
{
2007-10-16 00:14:19 +04:00
struct extent_buffer * parent = path - > nodes [ level ] ;
2007-03-12 19:01:18 +03:00
u32 nritems ;
2007-03-01 00:35:06 +03:00
int ret = 0 ;
2007-03-01 20:04:21 +03:00
int wret ;
2007-01-26 23:51:26 +03:00
2007-10-16 00:14:19 +04:00
nritems = btrfs_header_nritems ( parent ) ;
2009-01-06 05:25:51 +03:00
if ( slot ! = nritems - 1 ) {
2007-10-16 00:14:19 +04:00
memmove_extent_buffer ( parent ,
btrfs_node_key_ptr_offset ( slot ) ,
btrfs_node_key_ptr_offset ( slot + 1 ) ,
2007-03-30 22:27:56 +04:00
sizeof ( struct btrfs_key_ptr ) *
( nritems - slot - 1 ) ) ;
2007-03-01 20:04:21 +03:00
}
2007-03-12 19:01:18 +03:00
nritems - - ;
2007-10-16 00:14:19 +04:00
btrfs_set_header_nritems ( parent , nritems ) ;
2007-03-12 19:01:18 +03:00
if ( nritems = = 0 & & parent = = root - > node ) {
2007-10-16 00:14:19 +04:00
BUG_ON ( btrfs_header_level ( root - > node ) ! = 1 ) ;
2007-03-01 20:04:21 +03:00
/* just turn the root into a leaf and break */
2007-10-16 00:14:19 +04:00
btrfs_set_header_level ( root - > node , 0 ) ;
2007-03-01 20:04:21 +03:00
} else if ( slot = = 0 ) {
2007-10-16 00:14:19 +04:00
struct btrfs_disk_key disk_key ;
btrfs_node_key ( parent , & disk_key , 0 ) ;
wret = fixup_low_keys ( trans , root , path , & disk_key , level + 1 ) ;
2007-03-01 00:46:22 +03:00
if ( wret )
ret = wret ;
2007-01-26 23:51:26 +03:00
}
2007-03-30 22:27:56 +04:00
btrfs_mark_buffer_dirty ( parent ) ;
2007-03-01 00:35:06 +03:00
return ret ;
2007-01-26 23:51:26 +03:00
}
2008-10-02 03:05:46 +04:00
/*
* a helper function to delete the leaf pointed to by path - > slots [ 1 ] and
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
* path - > nodes [ 1 ] .
2008-10-02 03:05:46 +04:00
*
* This deletes the pointer in path - > nodes [ 1 ] and frees the leaf
* block extent . zero is returned if it all worked out , < 0 otherwise .
*
* The path must have already been setup for deleting the leaf , including
* all the proper balancing . path - > nodes [ 1 ] must be locked .
*/
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
static noinline int btrfs_del_leaf ( struct btrfs_trans_handle * trans ,
struct btrfs_root * root ,
struct btrfs_path * path ,
struct extent_buffer * leaf )
2008-10-02 03:05:46 +04:00
{
int ret ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
WARN_ON ( btrfs_header_generation ( leaf ) ! = trans - > transid ) ;
2008-10-02 03:05:46 +04:00
ret = del_ptr ( trans , root , path , 1 , path - > slots [ 1 ] ) ;
if ( ret )
return ret ;
2009-02-04 17:31:28 +03:00
/*
* btrfs_free_extent is expensive , we want to make sure we
* aren ' t holding any locks when we call it
*/
btrfs_unlock_up_safe ( path , 0 ) ;
2010-05-16 18:46:25 +04:00
root_sub_used ( root , leaf - > len ) ;
btrfs_free_tree_block ( trans , root , leaf , 0 , 1 ) ;
return 0 ;
2008-10-02 03:05:46 +04:00
}
2007-02-02 19:05:29 +03:00
/*
* delete the item at the leaf level in path . If that empties
* the leaf , remove it from the tree
*/
2008-01-29 23:11:36 +03:00
int btrfs_del_items ( struct btrfs_trans_handle * trans , struct btrfs_root * root ,
struct btrfs_path * path , int slot , int nr )
2007-01-26 23:51:26 +03:00
{
2007-10-16 00:14:19 +04:00
struct extent_buffer * leaf ;
struct btrfs_item * item ;
2008-01-29 23:11:36 +03:00
int last_off ;
int dsize = 0 ;
2007-03-01 00:35:06 +03:00
int ret = 0 ;
int wret ;
2008-01-29 23:11:36 +03:00
int i ;
2007-03-12 19:01:18 +03:00
u32 nritems ;
2007-01-26 23:51:26 +03:00
2007-10-16 00:14:19 +04:00
leaf = path - > nodes [ 0 ] ;
2008-01-29 23:11:36 +03:00
last_off = btrfs_item_offset_nr ( leaf , slot + nr - 1 ) ;
for ( i = 0 ; i < nr ; i + + )
dsize + = btrfs_item_size_nr ( leaf , slot + i ) ;
2007-10-16 00:14:19 +04:00
nritems = btrfs_header_nritems ( leaf ) ;
2007-01-26 23:51:26 +03:00
2008-01-29 23:11:36 +03:00
if ( slot + nr ! = nritems ) {
2007-03-14 21:14:43 +03:00
int data_end = leaf_data_end ( root , leaf ) ;
2007-10-16 00:14:19 +04:00
memmove_extent_buffer ( leaf , btrfs_leaf_data ( leaf ) +
2007-03-30 22:27:56 +04:00
data_end + dsize ,
btrfs_leaf_data ( leaf ) + data_end ,
2008-01-29 23:11:36 +03:00
last_off - data_end ) ;
2007-10-16 00:14:19 +04:00
2008-01-29 23:11:36 +03:00
for ( i = slot + nr ; i < nritems ; i + + ) {
2007-10-16 00:14:19 +04:00
u32 ioff ;
2007-10-16 00:15:53 +04:00
2007-10-16 00:14:19 +04:00
item = btrfs_item_nr ( leaf , i ) ;
2007-10-16 00:15:53 +04:00
if ( ! leaf - > map_token ) {
map_extent_buffer ( leaf , ( unsigned long ) item ,
sizeof ( struct btrfs_item ) ,
& leaf - > map_token , & leaf - > kaddr ,
& leaf - > map_start , & leaf - > map_len ,
KM_USER1 ) ;
}
2007-10-16 00:14:19 +04:00
ioff = btrfs_item_offset ( leaf , item ) ;
btrfs_set_item_offset ( leaf , item , ioff + dsize ) ;
2007-03-13 03:12:07 +03:00
}
2007-10-16 00:15:53 +04:00
if ( leaf - > map_token ) {
unmap_extent_buffer ( leaf , leaf - > map_token , KM_USER1 ) ;
leaf - > map_token = NULL ;
}
2007-10-16 00:14:19 +04:00
memmove_extent_buffer ( leaf , btrfs_item_nr_offset ( slot ) ,
2008-01-29 23:11:36 +03:00
btrfs_item_nr_offset ( slot + nr ) ,
2007-03-30 22:27:56 +04:00
sizeof ( struct btrfs_item ) *
2008-01-29 23:11:36 +03:00
( nritems - slot - nr ) ) ;
2007-01-26 23:51:26 +03:00
}
2008-01-29 23:11:36 +03:00
btrfs_set_header_nritems ( leaf , nritems - nr ) ;
nritems - = nr ;
2007-10-16 00:14:19 +04:00
2007-02-02 19:05:29 +03:00
/* delete the leaf if we've emptied it */
2007-03-12 19:01:18 +03:00
if ( nritems = = 0 ) {
2007-10-16 00:14:19 +04:00
if ( leaf = = root - > node ) {
btrfs_set_header_level ( leaf , 0 ) ;
2007-02-23 16:38:36 +03:00
} else {
2010-05-16 18:46:25 +04:00
btrfs_set_path_blocking ( path ) ;
clean_tree_block ( trans , root , leaf ) ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
ret = btrfs_del_leaf ( trans , root , path , leaf ) ;
2008-10-02 03:05:46 +04:00
BUG_ON ( ret ) ;
2007-02-23 16:38:36 +03:00
}
2007-01-26 23:51:26 +03:00
} else {
2007-03-12 19:01:18 +03:00
int used = leaf_space_used ( leaf , 0 , nritems ) ;
2007-03-01 00:35:06 +03:00
if ( slot = = 0 ) {
2007-10-16 00:14:19 +04:00
struct btrfs_disk_key disk_key ;
btrfs_item_key ( leaf , & disk_key , 0 ) ;
2007-03-16 23:20:31 +03:00
wret = fixup_low_keys ( trans , root , path ,
2007-10-16 00:14:19 +04:00
& disk_key , 1 ) ;
2007-03-01 00:35:06 +03:00
if ( wret )
ret = wret ;
}
2007-02-02 19:05:29 +03:00
/* delete the leaf if it is mostly empty */
2009-07-24 20:42:46 +04:00
if ( used < BTRFS_LEAF_DATA_SIZE ( root ) / 3 ) {
2007-01-26 23:51:26 +03:00
/* push_leaf_left fixes the path.
* make sure the path still points to our leaf
* for possible call to del_ptr below
*/
2007-01-27 00:38:42 +03:00
slot = path - > slots [ 1 ] ;
2007-10-16 00:14:19 +04:00
extent_buffer_get ( leaf ) ;
2009-03-13 18:00:37 +03:00
btrfs_set_path_blocking ( path ) ;
2010-07-07 18:51:48 +04:00
wret = push_leaf_left ( trans , root , path , 1 , 1 ,
1 , ( u32 ) - 1 ) ;
2007-06-22 22:16:25 +04:00
if ( wret < 0 & & wret ! = - ENOSPC )
2007-03-01 00:35:06 +03:00
ret = wret ;
2007-10-16 00:14:19 +04:00
if ( path - > nodes [ 0 ] = = leaf & &
btrfs_header_nritems ( leaf ) ) {
2010-07-07 18:51:48 +04:00
wret = push_leaf_right ( trans , root , path , 1 ,
1 , 1 , 0 ) ;
2007-06-22 22:16:25 +04:00
if ( wret < 0 & & wret ! = - ENOSPC )
2007-03-01 00:35:06 +03:00
ret = wret ;
}
2007-10-16 00:14:19 +04:00
if ( btrfs_header_nritems ( leaf ) = = 0 ) {
2008-10-02 03:05:46 +04:00
path - > slots [ 1 ] = slot ;
Btrfs: Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.
When a tree block in subvolume tree is cow'd, the reference counts of all
extents it points to are increased by one. At transaction commit time,
the old root of the subvolume is recorded in a "dead root" data structure,
and the btree it points to is later walked, dropping reference counts
and freeing any blocks where the reference count goes to 0.
The increments done during cow and decrements done after commit cancel out,
and the walk is a very expensive way to go about freeing the blocks that
are no longer referenced by the new btree root. This commit reduces the
transaction overhead by avoiding the need for dead root records.
When a non-shared tree block is cow'd, we free the old block at once, and the
new block inherits old block's references. When a tree block with reference
count > 1 is cow'd, we increase the reference counts of all extents
the new block points to by one, and decrease the old block's reference count by
one.
This dead tree avoidance code removes the need to modify the reference
counts of lower level extents when a non-shared tree block is cow'd.
But we still need to update back ref for all pointers in the block.
This is because the location of the block is recorded in the back ref
item.
We can solve this by introducing a new type of back ref. The new
back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer
by searching the tree. The shortcoming of the new back ref is that it
only works for pointers in tree blocks referenced by their owner trees.
This is mostly a problem for snapshots, where resolving one of these
fuzzy back references would be O(number_of_snapshots) and quite slow.
The solution used here is to use the fuzzy back references in the common
case where a given tree block is only referenced by one root,
and use the full back references when multiple roots have a reference
on a given block.
This commit adds per subvolume red-black tree to keep trace of cached
inodes. The red-black tree helps the balancing code to find cached
inodes whose inode numbers within a given range.
This commit improves the balancing code by introducing several data
structures to keep the state of balancing. The most important one
is the back ref cache. It caches how the upper level tree blocks are
referenced. This greatly reduce the overhead of checking back ref.
The improved balancing code scales significantly better with a large
number of snapshots.
This is a very large commit and was written in a number of
pieces. But, they depend heavily on the disk format change and were
squashed together to make sure git bisect didn't end up in a
bad state wrt space balancing or the format change.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-06-10 18:45:14 +04:00
ret = btrfs_del_leaf ( trans , root , path , leaf ) ;
2008-10-02 03:05:46 +04:00
BUG_ON ( ret ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( leaf ) ;
2007-02-24 14:24:44 +03:00
} else {
2008-06-26 00:01:30 +04:00
/* if we're still in the path, make sure
* we ' re dirty . Otherwise , one of the
* push_leaf functions must have already
* dirtied this buffer
*/
if ( path - > nodes [ 0 ] = = leaf )
btrfs_mark_buffer_dirty ( leaf ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( leaf ) ;
2007-01-26 23:51:26 +03:00
}
2007-03-23 17:01:08 +03:00
} else {
2007-10-16 00:14:19 +04:00
btrfs_mark_buffer_dirty ( leaf ) ;
2007-01-26 23:51:26 +03:00
}
}
2007-03-01 00:35:06 +03:00
return ret ;
2007-01-26 23:51:26 +03:00
}
2007-12-11 17:25:06 +03:00
/*
2008-06-26 00:01:30 +04:00
* search the tree again to find a leaf with lesser keys
2007-12-11 17:25:06 +03:00
* returns 0 if it found something or 1 if there are no lesser leaves .
* returns < 0 on io errors .
2008-09-29 23:18:18 +04:00
*
* This may release the path , and so you may lose any locks held at the
* time you call it .
2007-12-11 17:25:06 +03:00
*/
int btrfs_prev_leaf ( struct btrfs_root * root , struct btrfs_path * path )
{
2008-06-26 00:01:30 +04:00
struct btrfs_key key ;
struct btrfs_disk_key found_key ;
int ret ;
2007-12-11 17:25:06 +03:00
2008-06-26 00:01:30 +04:00
btrfs_item_key_to_cpu ( path - > nodes [ 0 ] , & key , 0 ) ;
2007-12-11 17:25:06 +03:00
2008-06-26 00:01:30 +04:00
if ( key . offset > 0 )
key . offset - - ;
else if ( key . type > 0 )
key . type - - ;
else if ( key . objectid > 0 )
key . objectid - - ;
else
return 1 ;
2007-12-11 17:25:06 +03:00
2011-04-21 03:20:15 +04:00
btrfs_release_path ( path ) ;
2008-06-26 00:01:30 +04:00
ret = btrfs_search_slot ( NULL , root , & key , path , 0 , 0 ) ;
if ( ret < 0 )
return ret ;
btrfs_item_key ( path - > nodes [ 0 ] , & found_key , 0 ) ;
ret = comp_keys ( & found_key , & key ) ;
if ( ret < 0 )
return 0 ;
return 1 ;
2007-12-11 17:25:06 +03:00
}
2008-06-26 00:01:31 +04:00
/*
* A helper function to walk down the tree starting at min_key , and looking
* for nodes or leaves that are either in cache or have a minimum
2008-09-29 23:18:18 +04:00
* transaction id . This is used by the btree defrag code , and tree logging
2008-06-26 00:01:31 +04:00
*
* This does not cow , but it does stuff the starting key it finds back
* into min_key , so you can call btrfs_search_slot with cow = 1 on the
* key and get a writable path .
*
* This does lock as it descends , and path - > keep_locks should be set
* to 1 by the caller .
*
* This honors path - > lowest_level to prevent descent past a given level
* of the tree .
*
2008-09-29 23:18:18 +04:00
* min_trans indicates the oldest transaction that you are interested
* in walking through . Any nodes or leaves older than min_trans are
* skipped over ( without reading them ) .
*
2008-06-26 00:01:31 +04:00
* returns zero if something useful was found , < 0 on error and 1 if there
* was nothing in the tree that matched the search criteria .
*/
int btrfs_search_forward ( struct btrfs_root * root , struct btrfs_key * min_key ,
2008-09-06 00:13:11 +04:00
struct btrfs_key * max_key ,
2008-06-26 00:01:31 +04:00
struct btrfs_path * path , int cache_only ,
u64 min_trans )
{
struct extent_buffer * cur ;
struct btrfs_key found_key ;
int slot ;
2008-07-24 20:19:49 +04:00
int sret ;
2008-06-26 00:01:31 +04:00
u32 nritems ;
int level ;
int ret = 1 ;
2008-12-09 00:43:10 +03:00
WARN_ON ( ! path - > keep_locks ) ;
2008-06-26 00:01:31 +04:00
again :
cur = btrfs_lock_root_node ( root ) ;
level = btrfs_header_level ( cur ) ;
2008-09-06 00:13:11 +04:00
WARN_ON ( path - > nodes [ level ] ) ;
2008-06-26 00:01:31 +04:00
path - > nodes [ level ] = cur ;
path - > locks [ level ] = 1 ;
if ( btrfs_header_generation ( cur ) < min_trans ) {
ret = 1 ;
goto out ;
}
2009-01-06 05:25:51 +03:00
while ( 1 ) {
2008-06-26 00:01:31 +04:00
nritems = btrfs_header_nritems ( cur ) ;
level = btrfs_header_level ( cur ) ;
2008-07-24 20:19:49 +04:00
sret = bin_search ( cur , min_key , level , & slot ) ;
2008-06-26 00:01:31 +04:00
2008-10-02 03:05:46 +04:00
/* at the lowest level, we're done, setup the path and exit */
if ( level = = path - > lowest_level ) {
2008-09-06 00:13:11 +04:00
if ( slot > = nritems )
goto find_next_key ;
2008-06-26 00:01:31 +04:00
ret = 0 ;
path - > slots [ level ] = slot ;
btrfs_item_key_to_cpu ( cur , & found_key , slot ) ;
goto out ;
}
2008-07-24 20:19:49 +04:00
if ( sret & & slot > 0 )
slot - - ;
2008-06-26 00:01:31 +04:00
/*
* check this node pointer against the cache_only and
* min_trans parameters . If it isn ' t in cache or is too
* old , skip to the next one .
*/
2009-01-06 05:25:51 +03:00
while ( slot < nritems ) {
2008-06-26 00:01:31 +04:00
u64 blockptr ;
u64 gen ;
struct extent_buffer * tmp ;
2008-09-06 00:13:11 +04:00
struct btrfs_disk_key disk_key ;
2008-06-26 00:01:31 +04:00
blockptr = btrfs_node_blockptr ( cur , slot ) ;
gen = btrfs_node_ptr_generation ( cur , slot ) ;
if ( gen < min_trans ) {
slot + + ;
continue ;
}
if ( ! cache_only )
break ;
2008-09-06 00:13:11 +04:00
if ( max_key ) {
btrfs_node_key ( cur , & disk_key , slot ) ;
if ( comp_keys ( & disk_key , max_key ) > = 0 ) {
ret = 1 ;
goto out ;
}
}
2008-06-26 00:01:31 +04:00
tmp = btrfs_find_tree_block ( root , blockptr ,
btrfs_level_size ( root , level - 1 ) ) ;
if ( tmp & & btrfs_buffer_uptodate ( tmp , gen ) ) {
free_extent_buffer ( tmp ) ;
break ;
}
if ( tmp )
free_extent_buffer ( tmp ) ;
slot + + ;
}
2008-09-06 00:13:11 +04:00
find_next_key :
2008-06-26 00:01:31 +04:00
/*
* we didn ' t find a candidate key in this node , walk forward
* and find another one
*/
if ( slot > = nritems ) {
2008-09-06 00:13:11 +04:00
path - > slots [ level ] = slot ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
btrfs_set_path_blocking ( path ) ;
2008-09-06 00:13:11 +04:00
sret = btrfs_find_next_key ( root , path , min_key , level ,
2008-06-26 00:01:31 +04:00
cache_only , min_trans ) ;
2008-09-06 00:13:11 +04:00
if ( sret = = 0 ) {
2011-04-21 03:20:15 +04:00
btrfs_release_path ( path ) ;
2008-06-26 00:01:31 +04:00
goto again ;
} else {
goto out ;
}
}
/* save our key for returning back */
btrfs_node_key_to_cpu ( cur , & found_key , slot ) ;
path - > slots [ level ] = slot ;
if ( level = = path - > lowest_level ) {
ret = 0 ;
unlock_up ( path , level , 1 ) ;
goto out ;
}
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
btrfs_set_path_blocking ( path ) ;
2008-06-26 00:01:31 +04:00
cur = read_node_slot ( root , cur , slot ) ;
2011-03-24 09:33:21 +03:00
BUG_ON ( ! cur ) ;
2008-06-26 00:01:31 +04:00
btrfs_tree_lock ( cur ) ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
2008-06-26 00:01:31 +04:00
path - > locks [ level - 1 ] = 1 ;
path - > nodes [ level - 1 ] = cur ;
unlock_up ( path , level , 1 ) ;
2009-02-12 22:09:45 +03:00
btrfs_clear_path_blocking ( path , NULL ) ;
2008-06-26 00:01:31 +04:00
}
out :
if ( ret = = 0 )
memcpy ( min_key , & found_key , sizeof ( found_key ) ) ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
btrfs_set_path_blocking ( path ) ;
2008-06-26 00:01:31 +04:00
return ret ;
}
/*
* this is similar to btrfs_next_leaf , but does not try to preserve
* and fixup the path . It looks for and returns the next key in the
* tree based on the current path and the cache_only and min_trans
* parameters .
*
* 0 is returned if another key is found , < 0 if there are any errors
* and 1 is returned if there are no higher keys in the tree
*
* path - > keep_locks should be set to 1 on the search made before
* calling this function .
*/
2008-06-26 00:01:31 +04:00
int btrfs_find_next_key ( struct btrfs_root * root , struct btrfs_path * path ,
2009-07-22 17:59:00 +04:00
struct btrfs_key * key , int level ,
2008-06-26 00:01:31 +04:00
int cache_only , u64 min_trans )
2008-06-26 00:01:31 +04:00
{
int slot ;
struct extent_buffer * c ;
2008-12-09 00:43:10 +03:00
WARN_ON ( ! path - > keep_locks ) ;
2009-01-06 05:25:51 +03:00
while ( level < BTRFS_MAX_LEVEL ) {
2008-06-26 00:01:31 +04:00
if ( ! path - > nodes [ level ] )
return 1 ;
slot = path - > slots [ level ] + 1 ;
c = path - > nodes [ level ] ;
2008-06-26 00:01:31 +04:00
next :
2008-06-26 00:01:31 +04:00
if ( slot > = btrfs_header_nritems ( c ) ) {
2009-07-22 17:59:00 +04:00
int ret ;
int orig_lowest ;
struct btrfs_key cur_key ;
if ( level + 1 > = BTRFS_MAX_LEVEL | |
! path - > nodes [ level + 1 ] )
2008-06-26 00:01:31 +04:00
return 1 ;
2009-07-22 17:59:00 +04:00
if ( path - > locks [ level + 1 ] ) {
level + + ;
continue ;
}
slot = btrfs_header_nritems ( c ) - 1 ;
if ( level = = 0 )
btrfs_item_key_to_cpu ( c , & cur_key , slot ) ;
else
btrfs_node_key_to_cpu ( c , & cur_key , slot ) ;
orig_lowest = path - > lowest_level ;
2011-04-21 03:20:15 +04:00
btrfs_release_path ( path ) ;
2009-07-22 17:59:00 +04:00
path - > lowest_level = level ;
ret = btrfs_search_slot ( NULL , root , & cur_key , path ,
0 , 0 ) ;
path - > lowest_level = orig_lowest ;
if ( ret < 0 )
return ret ;
c = path - > nodes [ level ] ;
slot = path - > slots [ level ] ;
if ( ret = = 0 )
slot + + ;
goto next ;
2008-06-26 00:01:31 +04:00
}
2009-07-22 17:59:00 +04:00
2008-06-26 00:01:31 +04:00
if ( level = = 0 )
btrfs_item_key_to_cpu ( c , key , slot ) ;
2008-06-26 00:01:31 +04:00
else {
u64 blockptr = btrfs_node_blockptr ( c , slot ) ;
u64 gen = btrfs_node_ptr_generation ( c , slot ) ;
if ( cache_only ) {
struct extent_buffer * cur ;
cur = btrfs_find_tree_block ( root , blockptr ,
btrfs_level_size ( root , level - 1 ) ) ;
if ( ! cur | | ! btrfs_buffer_uptodate ( cur , gen ) ) {
slot + + ;
if ( cur )
free_extent_buffer ( cur ) ;
goto next ;
}
free_extent_buffer ( cur ) ;
}
if ( gen < min_trans ) {
slot + + ;
goto next ;
}
2008-06-26 00:01:31 +04:00
btrfs_node_key_to_cpu ( c , key , slot ) ;
2008-06-26 00:01:31 +04:00
}
2008-06-26 00:01:31 +04:00
return 0 ;
}
return 1 ;
}
2007-02-24 21:39:08 +03:00
/*
2008-06-26 00:01:30 +04:00
* search the tree again to find a leaf with greater keys
2007-03-01 00:46:22 +03:00
* returns 0 if it found something or 1 if there are no greater leaves .
* returns < 0 on io errors .
2007-02-24 21:39:08 +03:00
*/
2007-03-13 17:46:10 +03:00
int btrfs_next_leaf ( struct btrfs_root * root , struct btrfs_path * path )
2007-02-21 00:40:44 +03:00
{
int slot ;
2009-04-03 18:14:18 +04:00
int level ;
2007-10-16 00:14:19 +04:00
struct extent_buffer * c ;
2009-04-03 18:14:18 +04:00
struct extent_buffer * next ;
2008-06-26 00:01:30 +04:00
struct btrfs_key key ;
u32 nritems ;
int ret ;
2009-04-03 18:14:18 +04:00
int old_spinning = path - > leave_spinning ;
int force_blocking = 0 ;
2008-06-26 00:01:30 +04:00
nritems = btrfs_header_nritems ( path - > nodes [ 0 ] ) ;
2009-01-06 05:25:51 +03:00
if ( nritems = = 0 )
2008-06-26 00:01:30 +04:00
return 1 ;
2009-04-03 18:14:18 +04:00
/*
* we take the blocks in an order that upsets lockdep . Using
* blocking mode is the only way around it .
*/
# ifdef CONFIG_DEBUG_LOCK_ALLOC
force_blocking = 1 ;
# endif
2008-06-26 00:01:30 +04:00
2009-04-03 18:14:18 +04:00
btrfs_item_key_to_cpu ( path - > nodes [ 0 ] , & key , nritems - 1 ) ;
again :
level = 1 ;
next = NULL ;
2011-04-21 03:20:15 +04:00
btrfs_release_path ( path ) ;
2009-04-03 18:14:18 +04:00
2008-06-26 00:01:30 +04:00
path - > keep_locks = 1 ;
2009-04-03 18:14:18 +04:00
if ( ! force_blocking )
path - > leave_spinning = 1 ;
2008-06-26 00:01:30 +04:00
ret = btrfs_search_slot ( NULL , root , & key , path , 0 , 0 ) ;
path - > keep_locks = 0 ;
if ( ret < 0 )
return ret ;
2008-06-26 00:01:30 +04:00
nritems = btrfs_header_nritems ( path - > nodes [ 0 ] ) ;
2008-06-26 00:01:30 +04:00
/*
* by releasing the path above we dropped all our locks . A balance
* could have added more items next to the key that used to be
* at the very end of the block . So , check again here and
* advance the path if there are now more items available .
*/
2008-06-26 00:01:30 +04:00
if ( nritems > 0 & & path - > slots [ 0 ] < nritems - 1 ) {
2009-07-22 17:59:00 +04:00
if ( ret = = 0 )
path - > slots [ 0 ] + + ;
2009-04-03 18:14:18 +04:00
ret = 0 ;
2008-06-26 00:01:30 +04:00
goto done ;
}
2007-02-21 00:40:44 +03:00
2009-01-06 05:25:51 +03:00
while ( level < BTRFS_MAX_LEVEL ) {
2009-04-03 18:14:18 +04:00
if ( ! path - > nodes [ level ] ) {
ret = 1 ;
goto done ;
}
2007-10-16 00:14:19 +04:00
2007-02-21 00:40:44 +03:00
slot = path - > slots [ level ] + 1 ;
c = path - > nodes [ level ] ;
2007-10-16 00:14:19 +04:00
if ( slot > = btrfs_header_nritems ( c ) ) {
2007-02-21 00:40:44 +03:00
level + + ;
2009-04-03 18:14:18 +04:00
if ( level = = BTRFS_MAX_LEVEL ) {
ret = 1 ;
goto done ;
}
2007-02-21 00:40:44 +03:00
continue ;
}
2007-10-16 00:14:19 +04:00
2008-06-26 00:01:30 +04:00
if ( next ) {
btrfs_tree_unlock ( next ) ;
2007-10-16 00:14:19 +04:00
free_extent_buffer ( next ) ;
2008-06-26 00:01:30 +04:00
}
2007-10-16 00:14:19 +04:00
2009-04-03 18:14:18 +04:00
next = c ;
ret = read_block_for_search ( NULL , root , path , & next , level ,
slot , & key ) ;
if ( ret = = - EAGAIN )
goto again ;
2007-10-16 00:14:19 +04:00
2009-05-14 21:24:30 +04:00
if ( ret < 0 ) {
2011-04-21 03:20:15 +04:00
btrfs_release_path ( path ) ;
2009-05-14 21:24:30 +04:00
goto done ;
}
2008-06-26 00:01:30 +04:00
if ( ! path - > skip_locking ) {
2009-04-03 18:14:18 +04:00
ret = btrfs_try_spin_lock ( next ) ;
if ( ! ret ) {
btrfs_set_path_blocking ( path ) ;
btrfs_tree_lock ( next ) ;
if ( ! force_blocking )
btrfs_clear_path_blocking ( path , next ) ;
}
if ( force_blocking )
btrfs_set_lock_blocking ( next ) ;
2008-06-26 00:01:30 +04:00
}
2007-02-21 00:40:44 +03:00
break ;
}
path - > slots [ level ] = slot ;
2009-01-06 05:25:51 +03:00
while ( 1 ) {
2007-02-21 00:40:44 +03:00
level - - ;
c = path - > nodes [ level ] ;
2008-06-26 00:01:30 +04:00
if ( path - > locks [ level ] )
btrfs_tree_unlock ( c ) ;
2009-04-03 18:14:18 +04:00
2007-10-16 00:14:19 +04:00
free_extent_buffer ( c ) ;
2007-02-21 00:40:44 +03:00
path - > nodes [ level ] = next ;
path - > slots [ level ] = 0 ;
2008-06-26 00:01:31 +04:00
if ( ! path - > skip_locking )
path - > locks [ level ] = 1 ;
2009-04-03 18:14:18 +04:00
2007-02-21 00:40:44 +03:00
if ( ! level )
break ;
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
2009-04-03 18:14:18 +04:00
ret = read_block_for_search ( NULL , root , path , & next , level ,
0 , & key ) ;
if ( ret = = - EAGAIN )
goto again ;
2009-05-14 21:24:30 +04:00
if ( ret < 0 ) {
2011-04-21 03:20:15 +04:00
btrfs_release_path ( path ) ;
2009-05-14 21:24:30 +04:00
goto done ;
}
2008-06-26 00:01:30 +04:00
if ( ! path - > skip_locking ) {
2009-03-09 18:45:38 +03:00
btrfs_assert_tree_locked ( path - > nodes [ level ] ) ;
2009-04-03 18:14:18 +04:00
ret = btrfs_try_spin_lock ( next ) ;
if ( ! ret ) {
btrfs_set_path_blocking ( path ) ;
btrfs_tree_lock ( next ) ;
if ( ! force_blocking )
btrfs_clear_path_blocking ( path , next ) ;
}
if ( force_blocking )
btrfs_set_lock_blocking ( next ) ;
2008-06-26 00:01:30 +04:00
}
2007-02-21 00:40:44 +03:00
}
2009-04-03 18:14:18 +04:00
ret = 0 ;
2008-06-26 00:01:30 +04:00
done :
unlock_up ( path , 0 , 1 ) ;
2009-04-03 18:14:18 +04:00
path - > leave_spinning = old_spinning ;
if ( ! old_spinning )
btrfs_set_path_blocking ( path ) ;
return ret ;
2007-02-21 00:40:44 +03:00
}
2008-03-24 22:01:56 +03:00
2008-06-26 00:01:31 +04:00
/*
* this uses btrfs_prev_leaf to walk backwards in the tree , and keeps
* searching until it gets past min_objectid or finds an item of ' type '
*
* returns 0 if something is found , 1 if nothing was found and < 0 on error
*/
2008-03-24 22:01:56 +03:00
int btrfs_previous_item ( struct btrfs_root * root ,
struct btrfs_path * path , u64 min_objectid ,
int type )
{
struct btrfs_key found_key ;
struct extent_buffer * leaf ;
2008-09-06 00:13:11 +04:00
u32 nritems ;
2008-03-24 22:01:56 +03:00
int ret ;
2009-01-06 05:25:51 +03:00
while ( 1 ) {
2008-03-24 22:01:56 +03:00
if ( path - > slots [ 0 ] = = 0 ) {
Btrfs: Change btree locking to use explicit blocking points
Most of the btrfs metadata operations can be protected by a spinlock,
but some operations still need to schedule.
So far, btrfs has been using a mutex along with a trylock loop,
most of the time it is able to avoid going for the full mutex, so
the trylock loop is a big performance gain.
This commit is step one for getting rid of the blocking locks entirely.
btrfs_tree_lock takes a spinlock, and the code explicitly switches
to a blocking lock when it starts an operation that can schedule.
We'll be able get rid of the blocking locks in smaller pieces over time.
Tracing allows us to find the most common cause of blocking, so we
can start with the hot spots first.
The basic idea is:
btrfs_tree_lock() returns with the spin lock held
btrfs_set_lock_blocking() sets the EXTENT_BUFFER_BLOCKING bit in
the extent buffer flags, and then drops the spin lock. The buffer is
still considered locked by all of the btrfs code.
If btrfs_tree_lock gets the spinlock but finds the blocking bit set, it drops
the spin lock and waits on a wait queue for the blocking bit to go away.
Much of the code that needs to set the blocking bit finishes without actually
blocking a good percentage of the time. So, an adaptive spin is still
used against the blocking bit to avoid very high context switch rates.
btrfs_clear_lock_blocking() clears the blocking bit and returns
with the spinlock held again.
btrfs_tree_unlock() can be called on either blocking or spinning locks,
it does the right thing based on the blocking bit.
ctree.c has a helper function to set/clear all the locked buffers in a
path as blocking.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-02-04 17:25:08 +03:00
btrfs_set_path_blocking ( path ) ;
2008-03-24 22:01:56 +03:00
ret = btrfs_prev_leaf ( root , path ) ;
if ( ret ! = 0 )
return ret ;
} else {
path - > slots [ 0 ] - - ;
}
leaf = path - > nodes [ 0 ] ;
2008-09-06 00:13:11 +04:00
nritems = btrfs_header_nritems ( leaf ) ;
if ( nritems = = 0 )
return 1 ;
if ( path - > slots [ 0 ] = = nritems )
path - > slots [ 0 ] - - ;
2008-03-24 22:01:56 +03:00
btrfs_item_key_to_cpu ( leaf , & found_key , path - > slots [ 0 ] ) ;
2008-09-06 00:13:11 +04:00
if ( found_key . objectid < min_objectid )
break ;
2009-07-24 19:06:53 +04:00
if ( found_key . type = = type )
return 0 ;
2008-09-06 00:13:11 +04:00
if ( found_key . objectid = = min_objectid & &
found_key . type < type )
break ;
2008-03-24 22:01:56 +03:00
}
return 1 ;
}
