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block: Fix incorrect alignment offset reporting and update documentation

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queue_sector_alignment_offset returned the wrong value which caused
partitions to report an incorrect alignment_offset.  Since offset
alignment calculation is needed several places it has been split into a
separate helper function.  The topology stacking function has been
updated accordingly.

Furthermore, comments have been added to clarify how the stacking
function works.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Tested-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Martin K. Petersen 2009-12-29 08:35:35 +01:00 • committed by Jens Axboe
parent 2f7a2d89a8
commit 81744ee44a
2 changed files with 42 additions and 13 deletions
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11
include/linux/blkdev.h
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@ -1116,11 +1116,18 @@ static inline int queue_alignment_offset(struct request_queue *q)
return q->limits.alignment_offset;
}
static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t offset)
{
unsigned int granularity = max(lim->physical_block_size, lim->io_min);
offset &= granularity - 1;
return (granularity + lim->alignment_offset - offset) & (granularity - 1);
}
static inline int queue_sector_alignment_offset(struct request_queue *q,
sector_t sector)
{
return ((sector << 9) - q->limits.alignment_offset)
& (q->limits.io_min - 1);
return queue_limit_alignment_offset(&q->limits, sector << 9);
}
static inline int bdev_alignment_offset(struct block_device *bdev)