[dm-devel] [PATCH 1/3] Send KOBJ_ADD event after dm resume ioctl.

[David Zeuthen]

On Fri, Mar 19, 2010 at 11:05 AM, Peter Rajnoha <prajnoha at redhat.com> wrote:

> As for the variables, we already carry some important
> information within uevents.
>
> Generally, it carries hints for udev rules to instruct them
> how they should be applied correctly, which parts should be
> run based on the type of the device, it's real meaning with all
> relations to other devices taken into account within that
> DM subsystem used (e.g. LVM2's snapshots, mirrors...).
>
> Most of this information is really not suitable to be stored
> as a sysfs attribute since it deals with userspace notions,
> an abstraction layer above device-mapper...
>

Presumably this information originates from user space when
setting up the device-mapper device, right? Why can't you
simply store it in, say, /var/run/device-mapper?

(Or, better, store it in /dev/.device-mapper/ to avoid hitting
the real disk - /dev is guaranteed to be on tmpfs)

Thanks,
David
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