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block: Topology ioctls

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Not all users of the topology information want to use libblkid.  Provide
the topology information through bdev ioctls.

Also clarify sector size comments for existing BLK ioctls.

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 2009-10-03 20:52:01 +02:00 • committed by Jens Axboe
parent 61f0c1dcaa
commit ac481c20ef
4 changed files with 62 additions and 7 deletions
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35
include/linux/blkdev.h
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@ -1081,25 +1081,37 @@ static inline unsigned int queue_physical_block_size(struct request_queue *q)
return q->limits.physical_block_size;
}
static inline int bdev_physical_block_size(struct block_device *bdev)
{
return queue_physical_block_size(bdev_get_queue(bdev));
}
static inline unsigned int queue_io_min(struct request_queue *q)
{
return q->limits.io_min;
}
static inline int bdev_io_min(struct block_device *bdev)
{
return queue_io_min(bdev_get_queue(bdev));
}
static inline unsigned int queue_io_opt(struct request_queue *q)
{
return q->limits.io_opt;
}
static inline int bdev_io_opt(struct block_device *bdev)
{
return queue_io_opt(bdev_get_queue(bdev));
}
static inline int queue_alignment_offset(struct request_queue *q)
{
if (q && q->limits.misaligned)
if (q->limits.misaligned)
return -1;
if (q && q->limits.alignment_offset)
return q->limits.alignment_offset;
return 0;
return q->limits.alignment_offset;
}
static inline int queue_sector_alignment_offset(struct request_queue *q,
@ -1109,6 +1121,19 @@ static inline int queue_sector_alignment_offset(struct request_queue *q,
& (q->limits.io_min - 1);
}
static inline int bdev_alignment_offset(struct block_device *bdev)
{
struct request_queue *q = bdev_get_queue(bdev);
if (q->limits.misaligned)
return -1;
if (bdev != bdev->bd_contains)
return bdev->bd_part->alignment_offset;
return q->limits.alignment_offset;
}
static inline int queue_dma_alignment(struct request_queue *q)
{
return q ? q->dma_alignment : 511;