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Pull backing device changes from Jens Axboe:
"This contains a cleanup of how the backing device is handled, in
preparation for a rework of the life time rules. In this part, the
most important change is to split the unrelated nommu mmap flags from
it, but also removing a backing_dev_info pointer from the
address_space (and inode), and a cleanup of other various minor bits.
Christoph did all the work here, I just fixed an oops with pages that
have a swap backing. Arnd fixed a missing export, and Oleg killed the
lustre backing_dev_info from staging. Last patch was from Al,
unexporting parts that are now no longer needed outside"
* 'for-3.20/bdi' of git://git.kernel.dk/linux-block:
Make super_blocks and sb_lock static
mtd: export new mtd_mmap_capabilities
fs: make inode_to_bdi() handle NULL inode
staging/lustre/llite: get rid of backing_dev_info
fs: remove default_backing_dev_info
fs: don't reassign dirty inodes to default_backing_dev_info
nfs: don't call bdi_unregister
ceph: remove call to bdi_unregister
fs: remove mapping->backing_dev_info
fs: export inode_to_bdi and use it in favor of mapping->backing_dev_info
nilfs2: set up s_bdi like the generic mount_bdev code
block_dev: get bdev inode bdi directly from the block device
block_dev: only write bdev inode on close
fs: introduce f_op->mmap_capabilities for nommu mmap support
fs: kill BDI_CAP_SWAP_BACKED
fs: deduplicate noop_backing_dev_info
The core VM already knows about VM_FAULT_SIGBUS, but cannot return a
"you should SIGSEGV" error, because the SIGSEGV case was generally
handled by the caller - usually the architecture fault handler.
That results in lots of duplication - all the architecture fault
handlers end up doing very similar "look up vma, check permissions, do
retries etc" - but it generally works. However, there are cases where
the VM actually wants to SIGSEGV, and applications _expect_ SIGSEGV.
In particular, when accessing the stack guard page, libsigsegv expects a
SIGSEGV. And it usually got one, because the stack growth is handled by
that duplicated architecture fault handler.
However, when the generic VM layer started propagating the error return
from the stack expansion in commit fee7e49d4514 ("mm: propagate error
from stack expansion even for guard page"), that now exposed the
existing VM_FAULT_SIGBUS result to user space. And user space really
expected SIGSEGV, not SIGBUS.
To fix that case, we need to add a VM_FAULT_SIGSEGV, and teach all those
duplicate architecture fault handlers about it. They all already have
the code to handle SIGSEGV, so it's about just tying that new return
value to the existing code, but it's all a bit annoying.
This is the mindless minimal patch to do this. A more extensive patch
would be to try to gather up the mostly shared fault handling logic into
one generic helper routine, and long-term we really should do that
cleanup.
Just from this patch, you can generally see that most architectures just
copied (directly or indirectly) the old x86 way of doing things, but in
the meantime that original x86 model has been improved to hold the VM
semaphore for shorter times etc and to handle VM_FAULT_RETRY and other
"newer" things, so it would be a good idea to bring all those
improvements to the generic case and teach other architectures about
them too.
Reported-and-tested-by: Takashi Iwai <tiwai@suse.de>
Tested-by: Jan Engelhardt <jengelh@inai.de>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # "s390 still compiles and boots"
Cc: linux-arch@vger.kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
With removal of backing_dev_info from struct address_space,
we don't need to assign it in Lustre either.
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Jens Axboe <axboe@fb.com>
Since "BDI: Provide backing device capability information [try #3]" the
backing_dev_info structure also provides flags for the kind of mmap
operation available in a nommu environment, which is entirely unrelated
to it's original purpose.
Introduce a new nommu-only file operation to provide this information to
the nommu mmap code instead. Splitting this from the backing_dev_info
structure allows to remove lots of backing_dev_info instance that aren't
otherwise needed, and entirely gets rid of the concept of providing a
backing_dev_info for a character device. It also removes the need for
the mtd_inodefs filesystem.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Tejun Heo <tj@kernel.org>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
In one of the places (ll_md_blocking_ast()) we had open-coded
!is_root_inode(inode) and replaced it with is_root_inode(inode).
See the last chunk of f76c23:
- inode != inode->i_sb->s_root->d_inode)
+ is_root_inode(inode))
should've been
+ !is_root_inode(inode))
obviously...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* removed several pieces of dead code in lustre_compat25.h
* don't open-code current_umask() (and BTW, 0755 & (S_IRWXUGO | S_ISVTX)
is better spelled as 0755)
* fix broken attempt to get the pathname by dentry - abusing d_path() for
that is simply wrong.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Here's the big staging tree pull request for 3.19-rc1.
We continued to delete more lines than were added, always a good thing,
but not at a huge rate this release, only about 70k lines removed
overall mostly from removing the horrid bcm driver.
Lots of normal staging driver cleanups and fixes all over the place,
well over a thousand of them, the shortlog shows all the horrid details.
The "contentious" thing here is the movement of the Android binder code
out of staging into the "real" part of the kernel. This is code that
has been stable for a few years now and is working as-is in the tens of
millions of devices with no issues. Yes, the code is horrid, and the
userspace api leaves a lot to be desired, but it's not going to change
due to legacy issues that we have no control over. Because so many
devices and companies rely on this, and the code is stable, might as
well promote it out of staging.
This was all discussed at the Linux Plumbers conference, and everyone
participating agreed that this was the best way forward.
There is work happening to replace the binder code with something new
that is happening right now, but I don't expect to see the results of
that work for another year at the earliest. If that ever happens, and
Android switches over to it, I'll gladly remove this version.
As for maintainers, I'll be glad to maintain this code, I've been doing
it for the past few years with no problems. I'll send a MAINTAINERS
entry for it before 3.19-final is out, still need to talk to the Google
developers about if they are willing to help with it or not, last I
checked they were, which was good.
All of these patches have been in linux-next for a while with no
reported issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'staging-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
Pull staging driver updates from Greg KH:
"Here's the big staging tree pull request for 3.19-rc1.
We continued to delete more lines than were added, always a good
thing, but not at a huge rate this release, only about 70k lines
removed overall mostly from removing the horrid bcm driver.
Lots of normal staging driver cleanups and fixes all over the place,
well over a thousand of them, the shortlog shows all the horrid
details.
The "contentious" thing here is the movement of the Android binder
code out of staging into the "real" part of the kernel. This is code
that has been stable for a few years now and is working as-is in the
tens of millions of devices with no issues. Yes, the code is horrid,
and the userspace api leaves a lot to be desired, but it's not going
to change due to legacy issues that we have no control over. Because
so many devices and companies rely on this, and the code is stable,
might as well promote it out of staging.
This was all discussed at the Linux Plumbers conference, and everyone
participating agreed that this was the best way forward.
There is work happening to replace the binder code with something new
that is happening right now, but I don't expect to see the results of
that work for another year at the earliest. If that ever happens, and
Android switches over to it, I'll gladly remove this version.
As for maintainers, I'll be glad to maintain this code, I've been
doing it for the past few years with no problems. I'll send a
MAINTAINERS entry for it before 3.19-final is out, still need to talk
to the Google developers about if they are willing to help with it or
not, last I checked they were, which was good.
All of these patches have been in linux-next for a while with no
reported issues"
* tag 'staging-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (1382 commits)
Staging: slicoss: Fix long line issues in slicoss.c
staging: rtl8712: remove unnecessary else after return
staging: comedi: change some printk calls to pr_err
staging: rtl8723au: hal: Removed the extra semicolon
lustre: Deletion of unnecessary checks before three function calls
staging: lustre: fix sparse warnings: static function declaration
staging: lustre: fixed sparse warnings related to static declarations
staging: unisys: remove duplicate header
staging: unisys: remove unneeded structure
staging: ft1000 : replace __attribute ((__packed__) with __packed
drivers: staging: rtl8192e: Include "asm/unaligned.h" instead of "access_ok.h" in "rtl819x_BAProc.c"
Drivers:staging:rtl8192e: Fixed checkpatch warning
Drivers:staging:clocking-wizard: Added a newline
staging: clocking-wizard: check for a valid clk_name pointer
staging: rtl8723au: Hal_InitPGData() avoid unnecessary typecasts
staging: rtl8723au: _DisableAnalog(): Avoid zero-init variables unnecessarily
staging: rtl8723au: Remove unnecessary wrapper _ResetDigitalProcedure1()
staging: rtl8723au: _ResetDigitalProcedure1_92C() reduce code obfuscation
staging: rtl8723au: Remove unnecessary wrapper _DisableRFAFEAndResetBB()
staging: rtl8723au: _DisableRFAFEAndResetBB8192C(): Reduce code obfuscation
...
The functions free_ll_remote_perm(), free_rmtperm_hash() and iput() test
whether their argument is NULL and then return immediately.
Thus the test around their calls is not needed.
This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/staging/lustre/lustre/mdc/mdc_request.c:63:5: warning: symbol 'mdc_unpack_capa' was not declared. Should it be static?
drivers/staging/lustre/lustre/mdc/mdc_request.c:150:5: warning: symbol 'mdc_getstatus' was not declared. Should it be static?
drivers/staging/lustre/lustre/mdc/mdc_request.c:217:5: warning: symbol 'mdc_getattr' was not declared. Should it be static?
drivers/staging/lustre/lustre/mdc/mdc_request.c:261:5: warning: symbol 'mdc_getattr_name' was not declared. Should it be static?
drivers/staging/lustre/lustre/mdc/mdc_request.c:444:5: warning: symbol 'mdc_setxattr' was not declared. Should it be static?
drivers/staging/lustre/lustre/mdc/mdc_request.c:455:5: warning: symbol 'mdc_getxattr' was not declared. Should it be static?
Signed-off-by: Janet Liu <jianhua.ljh@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
checkpatch complains about two places where a space is prohibited
before the braces for in "#if defined()" check. This patch removes
these warnings.
Signed-off-by: Andreas Ruprecht <rupran@einserver.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
checkpatch complains about three places where braces are not
necessary. This patch removes the braces.
Signed-off-by: Andreas Ruprecht <rupran@einserver.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
checkpatch finds two unnecessary line continuations in ldlm_lockd.c
which are removed by this patch.
Signed-off-by: Andreas Ruprecht <rupran@einserver.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
checkpatch complains about an unneeded return statement in the
function search_granted_lock(), which is removed by this patch.
Signed-off-by: Andreas Ruprecht <rupran@einserver.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
checkpatch complains about static variables being initialized to 0
which is unnecessary. This patch removes the initialization.
Signed-off-by: Andreas Ruprecht <rupran@einserver.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
checkpatch complains about two indentation errors where the case
statements are on a higher indentation level than the corresponding
switch statement. This patch removes these errors.
Signed-off-by: Andreas Ruprecht <rupran@einserver.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
checkpatch.pl complains about a number of places where spaces were
missing. This patch fixes all of these errors.
For better readability, the warning of hitting the 80 character per
line limit in line 1349 introduced by this change is ignored
deliberately.
Signed-off-by: Andreas Ruprecht <rupran@einserver.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
checkpatch complains about a number of lines which are over the
80 character line limit. This patch changes most of them to comply,
the few remaining lines with warnings are not changed for readability
reasons.
Signed-off-by: Andreas Ruprecht <rupran@einserver.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
checkpatch.pl complains about a number of missing newlines after
declarations. This patch gets rid of these warnings.
Signed-off-by: Andreas Ruprecht <rupran@einserver.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Fix the following sparse errors:
drivers/staging/lustre/lnet/lnet/router.c:756:1: warning: symbol 'lnet_wait_known_routerstate' was not declared. Should it be static?
drivers/staging/lustre/lnet/lnet/router.c:788:1: warning: symbol 'lnet_update_ni_status_locked' was not declared. Should it be static?
drivers/staging/lustre/lnet/lnet/router.c:828:1: warning: symbol 'lnet_destroy_rc_data' was not declared. Should it be static?
drivers/staging/lustre/lnet/lnet/router.c:848:16: warning: symbol 'lnet_create_rc_data_locked' was not declared. Should it be static?
drivers/staging/lustre/lnet/lnet/router.c:1228:1: warning: symbol 'lnet_destroy_rtrbuf' was not declared. Should it be static?
drivers/staging/lustre/lnet/lnet/router.c:1238:15: warning: symbol 'lnet_new_rtrbuf' was not declared. Should it be static?
drivers/staging/lustre/lnet/lnet/router.c:1274:1: warning: symbol 'lnet_rtrpool_free_bufs' was not declared. Should it be static?
drivers/staging/lustre/lnet/lnet/router.c:1303:1: warning: symbol 'lnet_rtrpool_alloc_bufs' was not declared. Should it be static?
drivers/staging/lustre/lnet/lnet/router.c:1337:1: warning: symbol 'lnet_rtrpool_init' was not declared. Should it be static?
Signed-off-by: Giedrius Statkevicius <giedriuswork@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Join the string fragments to make it easier to grep.
Ignored all the 80+ column lines.
Added many missing spaces when coalescing formats.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
FMODE_EXEC is type fmode_t but is used in operations
with integers which leads to sparse warnings:
drivers/staging/lustre/lustre/mdc/mdc_lib.c:198:21: warning: restricted fmode_t degrades to integer
drivers/staging/lustre/lustre/mdc/mdc_locks.c:300:49: warning: restricted fmode_t degrades to integer
Fix by using __FMODE_EXEC macro defined in fs.h.
Note the same warnings occurs with other fmode flags
here but they don't have a corresponding int macro.
Changes since v1:
remove ifdefs. FMODE_EXEC and __FMODE_EXEC should
always be defined in fs.h
Signed-off-by: Juston Li <juston.h.li@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Remove an unecessary return statement in a void function.
Remove an unecessary space between a function name and the parentheses.
Signed-off-by: Thomas Wood <tommyandrena@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Fixes the following checkpatch warning:
WARNING: braces {} are not necessary for single statement blocks
Signed-off-by: Balavasu Kuppusammyprathaban <kp.balavasu@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Remove the GOTO macro, as it is no longer used.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Remove the goto logging function, as it is no longer used.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)
// <smpl>
@@
identifier lbl;
identifier rc;
constant c;
@@
- GOTO(lbl,\(rc\|c\));
+ goto lbl;
@@
identifier lbl;
expression rc;
@@
- GOTO(lbl,rc);
+ rc;
+ goto lbl;
// </smpl>
In one case (OES_INV), consecutive gotos were factorized and a break was
removed.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
It does not support 64K page, so let it disabled for 64K page under all
architectures. The related error (with allmodconfig under tile):
CC [M] drivers/staging/lustre/lustre/llite/lloop.o
In file included from drivers/staging/lustre/lustre/llite/../include/../../include/linux/libcfs/libcfs.h:160:0,
from drivers/staging/lustre/lustre/llite/../include/lustre_lib.h:52,
from drivers/staging/lustre/lustre/llite/lloop.c:106:
drivers/staging/lustre/lustre/llite/lloop.c: In function 'loop_set_fd':
drivers/staging/lustre/lustre/llite/../include/../../include/linux/libcfs/libcfs_private.h:411:54: error: duplicate case value
#define CLASSERT(cond) do {switch (42) {case (cond): case 0: break; } } while (0)
^
drivers/staging/lustre/lustre/llite/lloop.c:525:2: note: in expansion of macro 'CLASSERT'
CLASSERT(PAGE_CACHE_SIZE < (1 << (sizeof(unsigned short) * 8)));
^
drivers/staging/lustre/lustre/llite/../include/../../include/linux/libcfs/libcfs_private.h:411:41: error: previously used here
#define CLASSERT(cond) do {switch (42) {case (cond): case 0: break; } } while (0)
^
drivers/staging/lustre/lustre/llite/lloop.c:525:2: note: in expansion of macro 'CLASSERT'
CLASSERT(PAGE_CACHE_SIZE < (1 << (sizeof(unsigned short) * 8)));
^
Use "find ./ | grep Kconfig | xargs grep --color 64K" to find all 64K
page macros.
Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This patch introduces the use of function put_unaligned_le64.
This is done using Coccinelle and semantic patch used is as follows:
@@ identifier tmp; expression ptr; expression y,e; type T; @@
- tmp = cpu_to_le64(y);
<+... when != tmp
- memcpy(ptr, (T)&tmp, ...);
+ put_unaligned_le64(y,ptr);
...+>
? tmp = e
@@ type T; identifier tmp; @@
- T tmp;
...when != tmp
Signed-off-by: Vaishali Thakkar <vthakkar1994@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
ksock_net_t uses a __u64 quantity as an 'incarnation' timestamp. This is also
passed on in hello messages and used to detect if a reboot has occurred.
This 'incarnation' is obtained using do_gettimeofday.It is only used in equality
checks, so the absolute value does not matter.
This patch replaces do_gettimeofday with ktime_get_ns for the following reasons:
1. ktime_get_ns returns a __u64 which is safer than 'struct timeval'
which will overflow on 32-bit systems in year 2038 and beyond.
2. Reduced compute: ktime_get_ns is faster than the multiply/add
combination used in this function
Signed-off-by: Tina Ruchandani <ruchandani.tina@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
