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

[Christoph Hellwig <hch@lst.de>]

On Thu, Jun 22, 2006 at 09:55:51AM -0700, Andrew Morton wrote:
> > - long (*unlocked_ioctl) (struct file *, unsigned, unsigned long);
> > + long (*unlocked_ioctl) (struct inode *, struct file *, unsigned, unsigned long);
> > 
> > so it can be used for block devices?
> 
> Perhaps it should (have).  It's a bit nasty, but we do have at least two
> internal callers who don't have a file*.
> 
> The alternative would be to cook up a fake file* like blkdev_get() does,
> but we don't want to propagate that practice.

Faking up the file struct is the only viable short-term option.  It
should be done in ioctl_by_bdev which every kernel blockdevice ioctl
user should use.  Long-term we should not pass a struct file but
a struct block_device *, but braindamage in floppy.c prevents that.

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