Public bug reported:
Binary package hint: udev
On current (as of this morning) Hardy, the /dev/disk/by-uuid/ links are
not pointing to a usable device for non LV devices when LVM is being use
Let me illustrate:
$ ls -l /dev/mapper/
total 0
crw-rw---- 1 root root 10, 63 2008-02-11 05:13 control
[ many LVM LVs ]
brw-rw---- 1 root disk 254, 11 2008-02-11 10:14 sda1
brw-rw---- 1 root disk 254, 12 2008-02-11 05:14 sda2
brw-rw---- 1 root disk 254, 0 2008-02-11 05:13 sda3
So as you can see, device-mapper has taken to managing the partitions of
my disk, which I don't really care about *except*:
$ ls -l /dev/disk/by-uuid/
total 0
...
lrwxrwxrwx 1 root root 10 2008-02-11 10:14 12b8250a-d031-4ee1-b486-5e67478d06b4
-> ../../sda1
...
lrwxrwxrwx 1 root root 10 2008-02-11 10:14 FFFF-FFFF -> ../../sda2
So those /dev/disk/by-uuid/ links point back to the /dev/<device> nodes,
not /dev/mapper/<device> nodes.
This can't work because once device-mapper has a device open and is
managing, access to the underlying device is denied:
$ sudo mount /dev/sda2 /mnt/windows/
mount: /dev/sda2 already mounted or /mnt/windows/ busy
That EBUSY is device-mapper having the device open:
$ sudo mount /dev/mapper/sda2 /mnt/windows/
$
So, the /dev/disk/by-uuid/ links pointing back to base /dev entries are
useless. They need to point to the device-mapper entries.
** Affects: udev (Ubuntu)
Importance: Undecided
Status: New
--
/dev/disk/by-uuid pointing to real device, not a device-mapper encapsulation
https://bugs.launchpad.net/bugs/190995
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