Re: 2.5.74-mm3

On Thu, Jul 10, 2003 at 02:21:08PM -0400, Valdis.Kletnieks@vt.edu wrote:

On Tue, 08 Jul 2003 22:35:48 PDT, Andrew Morton [off-list ref]  said:

quoted

ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.5/2.5.74/2.5.74-mm3/

OK, I'm finally getting around to actually commenting, this has been a niggling issue for
a while...

quoted

All 113 patches:

quoted

64-bit-dev_t-kdev_t.patch
  64-bit dev_t and kdev_t

Yes, this patch says "not ready for prime time, it breaks things".

In particular, this gives the device-mapper userspace indigestion, because the
ioctl passes something other than a 64-bit kdev_t in from libdevmapper. Upshot
is that the LVM2 'vgchange -ay' fails gloriously.

Workaround:  Compile the devmapper/LVM stuff with a private copy of include/
linux/kdev_t.h that matches the one the kernel uses.  No, I didn't actually get
that to work, so I backed out the 64-bit patch...

(And no, the recent devmapper/LVM2 stuff posted doesn't fix this).

The v1 ioctl interface passes the dev in as a __kernel_dev_t, so
unfortunately if you change the size of __kernel_dev_t you will have
to rebuild the tools.

The v4 ioctl interface just uses a __u64 which I hope will be future
proof.

- Joe
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