Re: [PATCH 01/15] dm: support ioctls on mapped devices

[Kevin Corry]

On Thu June 22 2006 11:55 am, Andrew Morton wrote:
> On Thu, 22 Jun 2006 16:17:21 +0100 Alasdair G Kergon <agk@xxxxxxxxxx> wrote:
> > On Thu, Jun 22, 2006 at 01:29:57AM -0700, Andrew Morton wrote:
> > See also block/scsi_ioctl.c:201 verify_command()  [scsi_cmd_ioctl]
> >          * file can be NULL from ioctl_by_bdev()...
> >
> > Or should we be working towards eliminating interfaces that use device
> > numbers?
>
> If possible.  I guess that would require DM to track the devices with
> file*'s or inode*'s or bdev*'s.  Which, I assume, would be non-trivial.

There already is a bdev pointer available. Each "consumed" device get a struct 
dm_dev, which has a *bdev field. From the bdev, it looks like we should be 
able to get to the gendisk, then the block_device_operations, and then the 
ioctl routine (if it exists). Correct?

-- 
Kevin Corry
kevcorry@xxxxxxxxxx
http://www.ibm.com/linux/
http://evms.sourceforge.net/
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