On Mon, 12 May 2014 17:52:44 +0200 Jochen Spieker <m...@well-adjusted.de> wrote:
> Hi folks, > > this looks very weird to me. My wheezy system claims that a filesystem > is mounted, but the mount directory appears to be empty and umount > fails because the filesystems is not mounted, after all: > > | # grep backup /etc/fstab > | /dev/mapper/backup-decrypted /srv/backup ext4 > noatime,nodiratime,barrier=1,noauto,nodelalloc 0 0 | > | # mount | grep backup > | /dev/mapper/backup-decrypted on /srv/backup type ext4 > (rw,noatime,nodiratime,nodelalloc,data=ordered) | > | # df -h /srv/backup/ > | Filesystem Size Used Avail Use% Mounted on > | /dev/mapper/backup-decrypted 2.5T 1.8T 699G 72% /srv/backup > | > | # ls -la /srv/backup/ > | total 8 > | drwxr-xr-x 2 root root 4096 Oct 21 2011 ./ > | drwxr-xr-x 11 root root 4096 Oct 22 2013 ../ > | > | # umount /srv/backup > | umount: /srv/backup: not mounted > > I don't think it's important, but the filesystem is encrypted using > LUKS on top of an LVM volume: > > | # grep backup /etc/crypttab > | backup-decrypted /dev/mapper/backup2-lvol0 > none noauto,luks,cipher=aes-cbc-plain:sha256 > > Interestingly, when I mount /srv/backup again, I can see its contents > and umount it afterwards. But only once. Complete transcript: > > | # mount /srv/backup/ > | > | # ls /srv/backup/ > | abattoir/ abattoir-winxp/ cupcake/ jigsaw/ lost+found/ mail/ > manowar/ _manual/ xenhost/ | > | # mount | grep backup > | /dev/mapper/backup-decrypted on /srv/backup type ext4 > (rw,noatime,nodiratime,nodelalloc,data=ordered) > | /dev/mapper/backup-decrypted on /srv/backup type ext4 > (rw,noatime,nodiratime,nodelalloc,data=ordered) | | # > umount /srv/backup | > | # umount /srv/backup > | umount: /srv/backup: not mounted > > Do you have any ideas what's wrong? > > Regards, > J. No. :-( But I do have some thoughts. First, if you're not unmounting /srv/backup as root, try doing so. Next, before /dev/mapper/backup-decrypted can exist, something (cryptsetup luksOpen) must create it. Look for that, in /etc/fstab and elsewhere. Also, something somewhere must input the LUKS filesystem's password. As a reference, here's my shellscript for mounting an encrypted Blu-Ray: ================================================== #!/bin/bash discdev=/dev/sr0 #change as needed for system udfmountpoint=/mnt/test mapperdev=udf udfloop=`sudo losetup -f` sudo losetup $udfloop $discdev sudo cryptsetup luksOpen $udfloop $mapperdev sudo mount /dev/mapper/$mapperdev $udfmountpoint echo Encrypted loop device is at /dev/mapper/$mapperdev or $udfloop. echo Read files from $udfmountpoint ================================================== When ready to unmount the disc, I work backwards, all as root or using sudo: * Unmount the disc from the mapper device. * Eject the disc. * use cryptsetup luksClose to close the encrypted device. * Use losetup -d to delete the loopback device. HTH, SteveT Steve Litt * http://www.troubleshooters.com/ Troubleshooting Training * Human Performance -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20140512125029.08dd185a@mydesk
