This is a note to let you know that I've just added the patch titled
btrfs: fix off-by-one chunk length calculation at contains_pending_extent()
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
btrfs-fix-off-by-one-chunk-length-calculation-at-con.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit bf239a197c04fe4b55e08b8d770a3726ed7e199d
Author: Filipe Manana <fdmanana@xxxxxxxx>
Date: Thu Feb 29 10:37:04 2024 +0000
btrfs: fix off-by-one chunk length calculation at contains_pending_extent()
[ Upstream commit ae6bd7f9b46a29af52ebfac25d395757e2031d0d ]
At contains_pending_extent() the value of the end offset of a chunk we
found in the device's allocation state io tree is inclusive, so when
we calculate the length we pass to the in_range() macro, we must sum
1 to the expression "physical_end - physical_offset".
In practice the wrong calculation should be harmless as chunks sizes
are never 1 byte and we should never have 1 byte ranges of unallocated
space. Nevertheless fix the wrong calculation.
Reported-by: Alex Lyakas <alex.lyakas@xxxxxxxxxx>
Link: https://lore.kernel.org/linux-btrfs/CAOcd+r30e-f4R-5x-S7sV22RJPe7+pgwherA6xqN2_qe7o4XTg@xxxxxxxxxxxxxx/
Fixes: 1c11b63eff2a ("btrfs: replace pending/pinned chunks lists with io tree")
CC: stable@xxxxxxxxxxxxxxx # 6.1+
Reviewed-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
Reviewed-by: Qu Wenruo <wqu@xxxxxxxx>
Signed-off-by: Filipe Manana <fdmanana@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index d67785be2c778..d852d94d51c00 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1403,7 +1403,7 @@ static bool contains_pending_extent(struct btrfs_device *device, u64 *start,
if (in_range(physical_start, *start, len) ||
in_range(*start, physical_start,
- physical_end - physical_start)) {
+ physical_end + 1 - physical_start)) {
*start = physical_end + 1;
return true;
}
