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block: Fix incorrect reporting of partition alignment

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commit 81744ee44a upstream

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

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Tested-by: Mike Snitzer <snitzer@redhat.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Martin K. Petersen
2010-01-15 01:55:07 -05:00
committed by Greg Kroah-Hartman
parent 8a9c3f5c34
commit 1bd24fdff4
1 changed files with 9 additions and 2 deletions
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11
include/linux/blkdev.h
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@@ -1114,11 +1114,18 @@ 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)