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btrfs: Reduce scope of delayed_rsv->lock in may_commit_trans

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After commit 996478ca9c ("btrfs: change how we decide to commit
transactions during flushing") there is no need to hold the delayed_rsv
during the percpu_counter_compare call since we get the byte's snapshot
earlier. So hold the lock only while reading delayed_rsv.

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 2017-11-07 11:22:54 +02:00 committed by David Sterba
parent f5c29bd9db
commit 057aac3e62
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/extent-tree.c
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@ -4945,12 +4945,12 @@ static int may_commit_transaction(struct btrfs_fs_info *fs_info,
bytes = 0;
else
bytes -= delayed_rsv->size;
spin_unlock(&delayed_rsv->lock);
if (percpu_counter_compare(&space_info->total_bytes_pinned,
bytes) < 0) {
spin_unlock(&delayed_rsv->lock);
return -ENOSPC;
}
spin_unlock(&delayed_rsv->lock);
commit:
trans = btrfs_join_transaction(fs_info->extent_root);