[dm-devel] [PATCH] improve atomicity of device creation

[Alasdair G Kergon]

On Tue, Dec 11, 2007 at 06:51:31PM +0100, Kay Sievers wrote:
> We can make the kernel's kobject_uevent() return the generated seqnum to
> the caller.

Is 32 bits enough?

We added 'uint32_t padding;' recently which we I reckon we could now use for
this.

dm_kobject_uevent() and alloc_dev() could keep a new field in
struct mapped_device up-to-date, and a new function could return its
value to dm-ioctl.c code to place into a renamed 'padding' field
before returning to userspace?

Alasdair
-- 
agk at redhat.com