Re: Problem with umount

[Jari Ruusu <jariruusu@xxxxxxxxxxxxxxxxxxxxx>]

Daniel Harvey wrote:
> My fstab mount line represents the following:
> 
> /media/usbdisk/.fs.ext3 --> /dev/loop4 --> /media/usbdisk/fs ext2
> file containing EXT3 filesystem --> loop device --> mounted EXT3
> filesystem

That is journaling file system on file backed loop.
loop-AES README section 2.2.

> The problem is that in the past, "umount /dev/loop4" worked, but NOT any
> more.

There are three ways to mount loop devices:

1) Do loop setup/teardown manually:

   losetup -e AES128 -K foo.gpg /dev/loop4 /dev/hda999
   mount -t ext3 /dev/loop4 /mnt
   umount /mnt   (or  umount /dev/loop4 )
   losetup -d /dev/loop4

2) Let mount/umount do loop setup/teardown for you:

   mount -t ext3 /dev/hda999 /mnt -o loop=/dev/loop4,encryption=AES128,gpgkey=foo.gpg
   umount /mnt   (or  umount /dev/hda999 )

3) The fstab way, mount/umount do loop setup/teardown for you:

   /etc/fstab line:
    /dev/hda999 /mnt ext3 defaults,noauto,loop=/dev/loop4,encryption=AES128,gpgkey=foo.gpg,user=daniel 0 0
   
   mount /mnt
   umount /mnt   (or  umount /dev/hda999 ) 

> However mount shows:
> 
> /media/usbdisk/.fs.ext3 on /media/usbdisk/fs type ext2
> (rw,nosuid,nodev,loop=/dev/loop4,user=daniel)

Looks like you used method (1) earlier and are now using method (3). umount
needs mountpoint directory or backing device that was used at mount time. If
you didn't mount /dev/loop4 device directly, then you should not expect
"umount /dev/loop4" to work either.

Try "umount /media/usbdisk/fs" or "umount /media/usbdisk/.fs.ext3"

-- 
Jari Ruusu  1024R/3A220F51 5B 4B F9 BB D3 3F 52 E9  DB 1D EB E3 24 0E A9 DD

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