Message-ID: <4C4CA601.6020201@redhat.com>
Date: Sun, 25 Jul 2010 23:00:49 +0200
From: Milan Broz <mbroz@redhat.com>
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To: Nils Radtke <lkml@Think-Future.de>
CC: linux-kernel@vger.kernel.org
Subject: Re: cryptsetup + lvm on usb disk, unusable /dev/dm-* after suspend/resume
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On 07/25/2010 06:06 PM, Nils Radtke wrote:

>   Using an external usb 2 hdd with recent kernels with cryptsetup containers that
>   contain lvm volumes. 
> 
>   After a suspend/resume cycle, with active lvm volumes, the mounted fs is "offline", 
>   the dm-* devices don't respond to commands issued. No more access possible.
>   
>   Have to reboot to free the devices.

I guess it is not dm/block layer problem but USB related - can you check syslog if
the device is not attached after resume with another major:minor?

If this happens - you can free the mappings using dmsetup:
- try to force umount fs (if mounted), then run "dmsetup table" and manually remove
orphaned mappings using "dmsetup remove".

Milan
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