Region size should be calculated by subtracting
the end from the beginning.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: dfb79ddb130e ("btrfs: track discardable extents for async discard")
Signed-off-by: Anastasia Belova <abelova@xxxxxxxxxxxxx>
---
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)
--
2.30.2
