udev 215 creates inactive MD devices upon stopping them

Hi,

as discussed on linux-raid, please fix the bug that udev 215 creates
inactive MD devices upon stopping them.

Reference: http://www.spinics.net/lists/raid/msg46676.html
Reported-by: Francis Moreau <[email protected]>

An open() call to /dev/mdX after creating it with mknod is enough to
create such inactive MD device.

According to Artur the issue is caused by this change in udev:

> commit 3ebdb81ef088afd3b4c72b516beb5610f8c93a0d
> Author: Kay Sievers <kay at vrfy.org>
> Date:   Sun Apr 13 19:54:27 2014 -0700
> 
>      udev: serialize/synchronize block device event handling with file locks
> 
> http://cgit.freedesktop.org/systemd/systemd/commit/?id=3ebdb81ef088afd3b4c72b516beb5610f8c93a0d
> 
> It seems that they have already disabled this for dm for some reason,
> but not for md:
> 
> commit e918a1b5a94f270186dca59156354acd2a596494
> Author: Kay Sievers <[email protected]>
> Date:   Tue Jun 3 16:49:38 2014 +0200
> 
>     udev: exclude device-mapper from block device ownership event locking
> 
> http://cgit.freedesktop.org/systemd/systemd/commit/?id=e918a1b5a94f270186dca59156354acd2a596494
> 

Thanks,
Sebastian
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