[systemd-devel] Forward from linux-raid@ ML: systemd-215 creates inactive MD devices upon stopping them

[Samuli Suominen]

Forwarding to systemd-devel@ for
http://bugs.gentoo.org/show_bug.cgi?id=517986


-------- Original Message --------
Subject: 	Re: udev 215 creates inactive MD devices upon stopping them
Date: 	Thu, 24 Jul 2014 17:48:05 +0200
From: 	Sebastian Parschauer <sebastian.riemer at profitbricks.com>
To: 	systemd-devel at freedesktop.org, Kay Sievers <kay at vrfy.org>
CC: 	Linux RAID <linux-raid at vger.kernel.org>,
artur.paszkiewicz at intel.com, Francis Moreau <francis.moro at gmail.com>



[resending to the correct mailing list]

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 <francis.moro at gmail.com>

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 <kay at vrfy.org>
> 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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