btrfs: reset max_extent_size on clear in a bitmap

commit 553cceb49681d60975d00892877d4c871bf220f9 upstream.

We need to clear the max_extent_size when we clear bits from a bitmap
since it could have been from the range that contains the
max_extent_size.

CC: stable@vger.kernel.org # 4.4+
Reviewed-by: Liu Bo <bo.liu@linux.alibaba.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index e75489e3b67cd21c8d418edd8ef44e921a31cf8f..9b3fbe7c16a910d0a06e03ff10fb443dc792a99b 100644 (file)
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -1710,6 +1710,8 @@ static inline void __bitmap_clear_bits(struct btrfs_free_space_ctl *ctl,
        bitmap_clear(info->bitmap, start, count);
 
        info->bytes -= bytes;
+       if (info->max_extent_size > ctl->unit)
+               info->max_extent_size = 0;
 }
 
 static void bitmap_clear_bits(struct btrfs_free_space_ctl *ctl,