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btrfs: add data_race() in btrfs_account_ro_block_groups_free_space()

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Surround the intentional empty list check with the data_race() annotation
so that tools like KCSAN don't report a data race. The race is intentional
as it's harmless and we want to avoid lock contention of the space_info
since its lock is heavily used (space reservation, space flushing, extent
allocation and deallocation, etc).

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2025-10-23 13:24:22 +01:00 committed by David Sterba
parent 8b6e1f5dce
commit cdf8a566ee
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/space-info.c
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@ -1948,7 +1948,7 @@ u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo)
int factor;
/* It's df, we don't care if it's racy */
if (list_empty(&sinfo->ro_bgs))
if (data_race(list_empty(&sinfo->ro_bgs)))
return 0;
spin_lock(&sinfo->lock);