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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 <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Martin K. Petersen 2009-10-03 20:52:01 +02:00 • committed by Jens Axboe
commit ac481c20ef
4 changed files with 62 additions and 7 deletions
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17
block/ioctl.c
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@ -138,6 +138,11 @@ static int put_int(unsigned long arg, int val)
return put_user(val, (int __user *)arg);
}
static int put_uint(unsigned long arg, unsigned int val)
{
return put_user(val, (unsigned int __user *)arg);
}
static int put_long(unsigned long arg, long val)
{
return put_user(val, (long __user *)arg);
@ -263,10 +268,18 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
case BLKROGET:
return put_int(arg, bdev_read_only(bdev) != 0);
case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */
case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
return put_int(arg, block_size(bdev));
case BLKSSZGET: /* get block device hardware sector size */
case BLKSSZGET: /* get block device logical block size */
return put_int(arg, bdev_logical_block_size(bdev));
case BLKPBSZGET: /* get block device physical block size */
return put_uint(arg, bdev_physical_block_size(bdev));
case BLKIOMIN:
return put_uint(arg, bdev_io_min(bdev));
case BLKIOOPT:
return put_uint(arg, bdev_io_opt(bdev));
case BLKALIGNOFF:
return put_int(arg, bdev_alignment_offset(bdev));
case BLKSECTGET:
return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
case BLKRASET: