[linux-lvm] Re: [RFLART] kdev_t in ioctls

[Christoph Hellwig]

On Mon, Jan 14, 2002 at 10:01:25AM -0800, Linus Torvalds wrote:
> 
> On Mon, 14 Jan 2002, Alexander Viro wrote:
> >
> > 	Linus, at least some ioctls (e.g. lvm ones) pass kdev_t from/to
> > userland.  While the common policy with ioctls is "anything goes", this
> > kind of abuse is IMNSHO over the top.
> 
> That's completely bogus.
> 
> The good news is that the bit-for-bit representation of old kdev_t and
> "dev_t" are obviously 100% the same, so we should just make the damn thing
> be dev_t, and user land will never notice anything.

Glibc disagrees with you (bits/types.h):

typedef __u_quad_t __dev_t;             /* Type of device numbers.  */

We'd have to use __kernel_dev_t instead which again pulls kernel
headers in..

	Christoph