[PATCH] btrfs: hold space_info->lock when clearing periodic reclaim ready

[Sun YangKai <sunk67188@gmail.com>]

btrfs_set_periodic_reclaim_ready() requires space_info->lock to be held,
as enforced by lockdep_assert_held(). However, btrfs_reclaim_sweep() was
calling it after do_reclaim_sweep() returns, at which point
space_info->lock is no longer held.

Fix this by explicitly acquiring space_info->lock before clearing the
periodic reclaim ready flag in btrfs_reclaim_sweep().

Fixes: 19eff93dc738 ("btrfs: fix periodic reclaim condition")
Reported-by: Chris Mason <clm@meta.com>
Closes: https://lore.kernel.org/linux-btrfs/20260208182556.891815-1-clm@meta.com/
Signed-off-by: Sun YangKai <sunk67188@gmail.com>
---
 fs/btrfs/space-info.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c
index 1dd65fae6349..931f0dc02b95 100644
--- a/fs/btrfs/space-info.c
+++ b/fs/btrfs/space-info.c
@@ -2205,8 +2205,11 @@ void btrfs_reclaim_sweep(const struct btrfs_fs_info *fs_info)
 		if (!btrfs_should_periodic_reclaim(space_info))
 			continue;
 		for (raid = 0; raid < BTRFS_NR_RAID_TYPES; raid++) {
-			if (do_reclaim_sweep(space_info, raid))
+			if (do_reclaim_sweep(space_info, raid)) {
+				spin_lock(&space_info->lock);
 				btrfs_set_periodic_reclaim_ready(space_info, false);
+				spin_unlock(&space_info->lock);
+			}
 		}
 	}
 }
-- 
2.52.0