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| author | Niels Dossche <dossche.niels@gmail.com> | 2022-02-25 22:20:28 +0100 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2022-03-14 13:13:53 +0100 |
| commit | 06bae876634ebf837ba70ea3de532b288326103d (patch) | |
| tree | df899f32f394187ec9b8206f2ec787b652f7a852 /fs/btrfs | |
| parent | ca5e4ea0beaec8bc674121838bf8614c089effb9 (diff) | |
| download | lwn-06bae876634ebf837ba70ea3de532b288326103d.tar.gz lwn-06bae876634ebf837ba70ea3de532b288326103d.zip | |
btrfs: extend locking to all space_info members accesses
bytes_pinned is always accessed under space_info->lock, except in
btrfs_preempt_reclaim_metadata_space, however the other members are
accessed under that lock. The reserved member of the rsv's are also
partially accessed under a lock and partially not. Move all these
accesses into the same lock to ensure consistency.
This could potentially race and lead to a flush instead of a commit but
it's not a big problem as it's only for preemptive flush.
CC: stable@vger.kernel.org # 5.15+
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Niels Dossche <niels.dossche@ugent.be>
Signed-off-by: Niels Dossche <dossche.niels@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/space-info.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c index 294242c194d8..62382ae1eb02 100644 --- a/fs/btrfs/space-info.c +++ b/fs/btrfs/space-info.c @@ -1061,7 +1061,6 @@ static void btrfs_preempt_reclaim_metadata_space(struct work_struct *work) trans_rsv->reserved; if (block_rsv_size < space_info->bytes_may_use) delalloc_size = space_info->bytes_may_use - block_rsv_size; - spin_unlock(&space_info->lock); /* * We don't want to include the global_rsv in our calculation, @@ -1092,6 +1091,8 @@ static void btrfs_preempt_reclaim_metadata_space(struct work_struct *work) flush = FLUSH_DELAYED_REFS_NR; } + spin_unlock(&space_info->lock); + /* * We don't want to reclaim everything, just a portion, so scale * down the to_reclaim by 1/4. If it takes us down to 0, |