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Message-Id: <20230821092902.31808-1-abelova@astralinux.ru>
Date: Mon, 21 Aug 2023 12:29:02 +0300
From: Anastasia Belova <abelova@...ralinux.ru>
To: Chris Mason <clm@...com>
Cc: Anastasia Belova <abelova@...ralinux.ru>,
Josef Bacik <josef@...icpanda.com>,
David Sterba <dsterba@...e.com>,
Dennis Zhou <dennis@...nel.org>, linux-btrfs@...r.kernel.org,
linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: [PATCH 5.10] btrfs: fix region size in count_bitmap_extents
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.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: dfb79ddb130e ("btrfs: track discardable extents for async discard")
Signed-off-by: Anastasia Belova <abelova@...ralinux.ru>
---
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
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