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btrfs: switch to per-transaction pinned extents

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This commit flips the switch to start tracking/processing pinned extents
on a per-transaction basis. It mostly replaces all references from
btrfs_fs_info::(pinned_extents|freed_extents[]) to
btrfs_transaction::pinned_extents.

Two notable modifications that warrant explicit mention are changing
clean_pinned_extents to get a reference to the previously running
transaction. The other one is removal of call to
btrfs_destroy_pinned_extent since transactions are going to be cleaned
in btrfs_cleanup_one_transaction.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2020-01-20 16:09:18 +02:00 committed by David Sterba
parent 45bb5d6ae9
commit fe119a6eeb
9 changed files with 48 additions and 68 deletions
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38
fs/btrfs/block-group.c
View File

@ -460,7 +460,7 @@ u64 add_new_free_space(struct btrfs_block_group *block_group, u64 start, u64 end
int ret;
while (start < end) {
ret = find_first_extent_bit(info->pinned_extents, start,
ret = find_first_extent_bit(&info->excluded_extents, start,
&extent_start, &extent_end,
EXTENT_DIRTY | EXTENT_UPTODATE,
NULL);
@ -1248,30 +1248,42 @@ out:
return ret;
}
static bool clean_pinned_extents(struct btrfs_block_group *bg)
static bool clean_pinned_extents(struct btrfs_trans_handle *trans,
struct btrfs_block_group *bg)
{
struct btrfs_fs_info *fs_info = bg->fs_info;
struct btrfs_transaction *prev_trans = NULL;
const u64 start = bg->start;
const u64 end = start + bg->length - 1;
int ret;
spin_lock(&fs_info->trans_lock);
if (trans->transaction->list.prev != &fs_info->trans_list) {
prev_trans = list_last_entry(&trans->transaction->list,
struct btrfs_transaction, list);
refcount_inc(&prev_trans->use_count);
}
spin_unlock(&fs_info->trans_lock);
/*
* Hold the unused_bg_unpin_mutex lock to avoid racing with
* btrfs_finish_extent_commit(). If we are at transaction N, another
* task might be running finish_extent_commit() for the previous
* transaction N - 1, and have seen a range belonging to the block
* group in freed_extents[] before we were able to clear the whole
* block group range from freed_extents[]. This means that task can
* lookup for the block group after we unpinned it from freed_extents
* and removed it, leading to a BUG_ON() at unpin_extent_range().
* group in pinned_extents before we were able to clear the whole block
* group range from pinned_extents. This means that task can lookup for
* the block group after we unpinned it from pinned_extents and removed
* it, leading to a BUG_ON() at unpin_extent_range().
*/
mutex_lock(&fs_info->unused_bg_unpin_mutex);
ret = clear_extent_bits(&fs_info->freed_extents[0], start, end,
EXTENT_DIRTY);
if (ret)
goto err;
if (prev_trans) {
ret = clear_extent_bits(&prev_trans->pinned_extents, start, end,
EXTENT_DIRTY);
if (ret)
goto err;
}
ret = clear_extent_bits(&fs_info->freed_extents[1], start, end,
ret = clear_extent_bits(&trans->transaction->pinned_extents, start, end,
EXTENT_DIRTY);
if (ret)
goto err;
@ -1380,7 +1392,7 @@ void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info)
* We could have pending pinned extents for this block group,
* just delete them, we don't care about them anymore.
*/
if (!clean_pinned_extents(block_group))
if (!clean_pinned_extents(trans, block_group))
goto end_trans;
/*
@ -2890,7 +2902,7 @@ int btrfs_update_block_group(struct btrfs_trans_handle *trans,
&cache->space_info->total_bytes_pinned,
num_bytes,
BTRFS_TOTAL_BYTES_PINNED_BATCH);
set_extent_dirty(info->pinned_extents,
set_extent_dirty(&trans->transaction->pinned_extents,
bytenr, bytenr + num_bytes - 1,
GFP_NOFS | __GFP_NOFAIL);
}

4
fs/btrfs/ctree.h
View File

@ -596,8 +596,8 @@ struct btrfs_fs_info {
/* keep track of unallocated space */
atomic64_t free_chunk_space;
struct extent_io_tree freed_extents[2];
struct extent_io_tree *pinned_extents;
/* Track ranges which are used by log trees blocks/logged data extents */
struct extent_io_tree excluded_extents;
/* logical->physical extent mapping */
struct extent_map_tree mapping_tree;

30
fs/btrfs/disk-io.c
View File

@ -2075,10 +2075,8 @@ void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info)
btrfs_drop_and_free_fs_root(fs_info, gang[i]);
}
if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
btrfs_free_log_root_tree(NULL, fs_info);
btrfs_destroy_pinned_extent(fs_info, fs_info->pinned_extents);
}
}
static void btrfs_init_scrub(struct btrfs_fs_info *fs_info)
@ -2749,11 +2747,8 @@ void btrfs_init_fs_info(struct btrfs_fs_info *fs_info)
fs_info->block_group_cache_tree = RB_ROOT;
fs_info->first_logical_byte = (u64)-1;
extent_io_tree_init(fs_info, &fs_info->freed_extents[0],
IO_TREE_FS_INFO_FREED_EXTENTS0, NULL);
extent_io_tree_init(fs_info, &fs_info->freed_extents[1],
IO_TREE_FS_INFO_FREED_EXTENTS1, NULL);
fs_info->pinned_extents = &fs_info->freed_extents[0];
extent_io_tree_init(fs_info, &fs_info->excluded_extents,
IO_TREE_FS_EXCLUDED_EXTENTS, NULL);
set_bit(BTRFS_FS_BARRIER, &fs_info->flags);
mutex_init(&fs_info->ordered_operations_mutex);
@ -4434,16 +4429,12 @@ static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
}
static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
struct extent_io_tree *pinned_extents)
struct extent_io_tree *unpin)
{
struct extent_io_tree *unpin;
u64 start;
u64 end;
int ret;
bool loop = true;
unpin = pinned_extents;
again:
while (1) {
struct extent_state *cached_state = NULL;
@ -4468,15 +4459,6 @@ again:
cond_resched();
}
if (loop) {
if (unpin == &fs_info->freed_extents[0])
unpin = &fs_info->freed_extents[1];
else
unpin = &fs_info->freed_extents[0];
loop = false;
goto again;
}
return 0;
}
@ -4567,8 +4549,7 @@ void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
btrfs_destroy_marked_extents(fs_info, &cur_trans->dirty_pages,
EXTENT_DIRTY);
btrfs_destroy_pinned_extent(fs_info,
fs_info->pinned_extents);
btrfs_destroy_pinned_extent(fs_info, &cur_trans->pinned_extents);
cur_trans->state =TRANS_STATE_COMPLETED;
wake_up(&cur_trans->commit_wait);
@ -4620,7 +4601,6 @@ static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info)
btrfs_destroy_all_ordered_extents(fs_info);
btrfs_destroy_delayed_inodes(fs_info);
btrfs_assert_delayed_root_empty(fs_info);
btrfs_destroy_pinned_extent(fs_info, fs_info->pinned_extents);
btrfs_destroy_all_delalloc_inodes(fs_info);
mutex_unlock(&fs_info->transaction_kthread_mutex);

4
fs/btrfs/extent-io-tree.h
View File

@ -36,8 +36,8 @@ struct io_failure_record;
#define CHUNK_TRIMMED EXTENT_DEFRAG
enum {
IO_TREE_FS_INFO_FREED_EXTENTS0,
IO_TREE_FS_INFO_FREED_EXTENTS1,
IO_TREE_FS_PINNED_EXTENTS,
IO_TREE_FS_EXCLUDED_EXTENTS,
IO_TREE_INODE_IO,
IO_TREE_INODE_IO_FAILURE,
IO_TREE_RELOC_BLOCKS,

31
fs/btrfs/extent-tree.c
View File

@ -64,10 +64,8 @@ int btrfs_add_excluded_extent(struct btrfs_fs_info *fs_info,
u64 start, u64 num_bytes)
{
u64 end = start + num_bytes - 1;
set_extent_bits(&fs_info->freed_extents[0],
start, end, EXTENT_UPTODATE);
set_extent_bits(&fs_info->freed_extents[1],
start, end, EXTENT_UPTODATE);
set_extent_bits(&fs_info->excluded_extents, start, end,
EXTENT_UPTODATE);
return 0;
}
@ -79,10 +77,8 @@ void btrfs_free_excluded_extents(struct btrfs_block_group *cache)
start = cache->start;
end = start + cache->length - 1;
clear_extent_bits(&fs_info->freed_extents[0],
start, end, EXTENT_UPTODATE);
clear_extent_bits(&fs_info->freed_extents[1],
start, end, EXTENT_UPTODATE);
clear_extent_bits(&fs_info->excluded_extents, start, end,
EXTENT_UPTODATE);
}
static u64 generic_ref_to_space_flags(struct btrfs_ref *ref)
@ -2605,7 +2601,7 @@ static int pin_down_extent(struct btrfs_trans_handle *trans,
percpu_counter_add_batch(&cache->space_info->total_bytes_pinned,
num_bytes, BTRFS_TOTAL_BYTES_PINNED_BATCH);
set_extent_dirty(fs_info->pinned_extents, bytenr,
set_extent_dirty(&trans->transaction->pinned_extents, bytenr,
bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL);
return 0;
}
@ -2761,11 +2757,6 @@ void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info)
}
}
if (fs_info->pinned_extents == &fs_info->freed_extents[0])
fs_info->pinned_extents = &fs_info->freed_extents[1];
else
fs_info->pinned_extents = &fs_info->freed_extents[0];
up_write(&fs_info->commit_root_sem);
btrfs_update_global_block_rsv(fs_info);
@ -2906,10 +2897,7 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans)
u64 end;
int ret;
if (fs_info->pinned_extents == &fs_info->freed_extents[0])
unpin = &fs_info->freed_extents[1];
else
unpin = &fs_info->freed_extents[0];
unpin = &trans->transaction->pinned_extents;
while (!TRANS_ABORTED(trans)) {
struct extent_state *cached_state = NULL;
@ -2921,12 +2909,9 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans)
mutex_unlock(&fs_info->unused_bg_unpin_mutex);
break;
}
if (test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags)) {
clear_extent_bits(&fs_info->freed_extents[0], start,
if (test_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags))
clear_extent_bits(&fs_info->excluded_extents, start,
end, EXTENT_UPTODATE);
clear_extent_bits(&fs_info->freed_extents[1], start,
end, EXTENT_UPTODATE);
}
if (btrfs_test_opt(fs_info, DISCARD_SYNC))
ret = btrfs_discard_extent(fs_info, start,

2
fs/btrfs/free-space-cache.c
View File

@ -1086,7 +1086,7 @@ static noinline_for_stack int write_pinned_extent_entries(
* We shouldn't have switched the pinned extents yet so this is the
* right one
*/
unpin = block_group->fs_info->pinned_extents;
unpin = &trans->transaction->pinned_extents;
start = block_group->start;

2
fs/btrfs/transaction.c
View File

@ -336,6 +336,8 @@ loop:
list_add_tail(&cur_trans->list, &fs_info->trans_list);
extent_io_tree_init(fs_info, &cur_trans->dirty_pages,
IO_TREE_TRANS_DIRTY_PAGES, fs_info->btree_inode);
extent_io_tree_init(fs_info, &cur_trans->pinned_extents,
IO_TREE_FS_PINNED_EXTENTS, NULL);
fs_info->generation++;
cur_trans->transid = fs_info->generation;
fs_info->running_transaction = cur_trans;

1
fs/btrfs/transaction.h
View File

@ -71,6 +71,7 @@ struct btrfs_transaction {
*/
struct list_head io_bgs;
struct list_head dropped_roots;
struct extent_io_tree pinned_extents;
/*
* we need to make sure block group deletion doesn't race with

4
include/trace/events/btrfs.h
View File

@ -81,8 +81,8 @@ TRACE_DEFINE_ENUM(COMMIT_TRANS);
#define show_extent_io_tree_owner(owner) \
__print_symbolic(owner, \
{ IO_TREE_FS_INFO_FREED_EXTENTS0, "FREED_EXTENTS0" }, \
{ IO_TREE_FS_INFO_FREED_EXTENTS1, "FREED_EXTENTS1" }, \
{ IO_TREE_FS_PINNED_EXTENTS, "PINNED_EXTENTS" }, \
{ IO_TREE_FS_EXCLUDED_EXTENTS, "EXCLUDED_EXTENTS" }, \
{ IO_TREE_INODE_IO, "INODE_IO" }, \
{ IO_TREE_INODE_IO_FAILURE, "INODE_IO_FAILURE" }, \
{ IO_TREE_RELOC_BLOCKS, "RELOC_BLOCKS" }, \