03/10/23 15:39, Anastasia Belova пишет:

14/09/23 12:45, Anastasia Belova пишет:

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count_bitmap_extents was deleted in version 5.11, but there is possible mistake in versions 5.6-5.10.

Region size should be calculated by subtracting the end from the beginning.

Do I understand correctly that bytes should decrease and (rs - re) is always negative and should be replaced by (re - rs)?

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Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: dfb79ddb130e ("btrfs: track discardable extents for async discard") Signed-off-by: Anastasia Belovaabelova@astralinux.ru

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fs/btrfs/free-space-cache.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index 4989c60b1df9..a34e266a0969 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -1930,7 +1930,7 @@ static int count_bitmap_extents(struct btrfs_free_space_ctl *ctl, bitmap_for_each_set_region(bitmap_info->bitmap, rs, re, 0, BITS_PER_BITMAP) {

• bytes -= (rs - re) * ctl->unit;
  

• bytes -= (re - rs) * ctl->unit;
  

  count++;

if (!bytes)

Anastasia

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