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block: fix incorrect branching in blk_max_size_offset()

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If non-zero 'chunk_sectors' is passed in to blk_max_size_offset() that
override will be incorrectly ignored.

Old blk_max_size_offset() branching, prior to commit 3ee16db390,
must be used only if passed 'chunk_sectors' override is zero.

Fixes: 3ee16db390 ("dm: fix IO splitting")
Cc: stable@vger.kernel.org # 5.9
Reported-by: John Dorminy <jdorminy@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2020-12-04 17:21:03 -05:00
parent bde3808bc8
commit 65f33b3572
1 changed files with 6 additions and 4 deletions
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10
include/linux/blkdev.h
View file

@ -1076,10 +1076,12 @@ static inline unsigned int blk_max_size_offset(struct request_queue *q,
sector_t offset,
unsigned int chunk_sectors)
{
if (!chunk_sectors && q->limits.chunk_sectors)
chunk_sectors = q->limits.chunk_sectors;
else
return q->limits.max_sectors;
if (!chunk_sectors) {
if (q->limits.chunk_sectors)
chunk_sectors = q->limits.chunk_sectors;
else
return q->limits.max_sectors;
}
if (likely(is_power_of_2(chunk_sectors)))
chunk_sectors -= offset & (chunk_sectors - 1);