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block: Stop using byte offsets

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All callers of the stacking functions use 512-byte sector units rather
than byte offsets.  Simplify the code so the stacking functions take
sectors when specifying data offsets.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Martin K. Petersen
2010-01-11 03:21:51 -05:00
committed by Jens Axboe
parent ce289321b7
commit e03a72e136
3 changed files with 18 additions and 32 deletions
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17
include/linux/blkdev.h
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@@ -1112,18 +1112,13 @@ 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)
static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
{
unsigned int granularity = max(lim->physical_block_size, lim->io_min);
unsigned int alignment = (sector << 9) & (granularity - 1);
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 queue_limit_alignment_offset(&q->limits, sector << 9);
return (granularity + lim->alignment_offset - alignment)
& (granularity - 1);
}
static inline int bdev_alignment_offset(struct block_device *bdev)
@@ -1147,10 +1142,8 @@ static inline int queue_discard_alignment(struct request_queue *q)
return q->limits.discard_alignment;
}
static inline int queue_sector_discard_alignment(struct request_queue *q,
sector_t sector)
static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
{
struct queue_limits *lim = &q->limits;
unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1);
return (lim->discard_granularity + lim->discard_alignment - alignment)