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dm: refactor ioctl handling

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This moves the call to blkdev_ioctl and the argument checking to DM core
code, and only leaves a callout to find the block device to operate on
in the targets.  This simplifies the code and allows us to pass through
ioctl-like command using other methods in the next patch.

Also split out a helper around calling the prepare_ioctl method that
will be reused for persistent reservation handling.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Christoph Hellwig
2015-10-15 14:10:50 +02:00
committed by Mike Snitzer
parent 47796938c4
commit e56f81e0b0
8 changed files with 94 additions and 75 deletions
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14
drivers/md/dm-linear.c
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@@ -116,21 +116,21 @@ static void linear_status(struct dm_target *ti, status_type_t type,
}
}
static int linear_ioctl(struct dm_target *ti, unsigned int cmd,
unsigned long arg)
static int linear_prepare_ioctl(struct dm_target *ti,
struct block_device **bdev, fmode_t *mode)
{
struct linear_c *lc = (struct linear_c *) ti->private;
struct dm_dev *dev = lc->dev;
int r = 0;
*bdev = dev->bdev;
/*
* Only pass ioctls through if the device sizes match exactly.
*/
if (lc->start ||
ti->len != i_size_read(dev->bdev->bd_inode) >> SECTOR_SHIFT)
r = scsi_verify_blk_ioctl(NULL, cmd);
return r ? : __blkdev_driver_ioctl(dev->bdev, dev->mode, cmd, arg);
return 1;
return 0;
}
static int linear_iterate_devices(struct dm_target *ti,
@@ -149,7 +149,7 @@ static struct target_type linear_target = {
.dtr = linear_dtr,
.map = linear_map,
.status = linear_status,
.ioctl = linear_ioctl,
.prepare_ioctl = linear_prepare_ioctl,
.iterate_devices = linear_iterate_devices,
};