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block: fix get_max_io_size()

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commit e4b469c66f3cbb81c2e94d31123d7bcdf3c1dabd upstream.

A previous commit aligning splits to physical block sizes inadvertently
modified one return case such that that it now returns 0 length splits
when the number of sectors doesn't exceed the physical offset. This
later hits a BUG in bio_split(). Restore the previous working behavior.

Fixes: 9cc5169cd4 ("block: Improve physical block alignment of split bios")
Reported-by: Eric Deal <[email protected]>
Signed-off-by: Keith Busch <[email protected]>
Cc: Bart Van Assche <[email protected]>
Cc: [email protected]
Signed-off-by: Jens Axboe <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Keith Busch 2020-08-06 14:58:37 -07:00 • committed by Greg Kroah-Hartman
commit f09dbec9c0
1 changed files with 1 additions and 1 deletions
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block/blk-merge.c
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@ -154,7 +154,7 @@ static inline unsigned get_max_io_size(struct request_queue *q,
if (max_sectors > start_offset)
return max_sectors - start_offset;
return sectors & (lbs - 1);
return sectors & ~(lbs - 1);
}
static inline unsigned get_max_segment_size(const struct request_queue *q,