Bug#377646: lvm2: Persistent minors don't work

Alexander E. Patrakov patrakov at ums.usu.ru
Mon Jul 10 12:52:59 UTC 2006


Package: lvm2
Version: 2.02.06-2
Severity: normal

The persistent major/minor numbers are silently ignored. Here is
a state of the system before an attempt to create a LVM volume with
persistent major and minor:

home:~# ls -l /dev/mapper
total 0
crw------- 1 root root  10, 63 2006-06-30 21:03 control
brw-rw---- 1 root disk 254,  0 2006-07-10 17:51 mainvg-boot
brw-rw---- 1 root disk 254,  8 2006-07-10 17:51 mainvg-etch
brw-rw---- 1 root disk 254,  4 2006-07-10 17:51 mainvg-etchroot
brw-rw---- 1 root disk 254,  5 2006-07-10 17:51 mainvg-home
brw-rw---- 1 root disk 254,  2 2006-07-10 17:51 mainvg-lfs
brw-rw---- 1 root disk 254,  7 2006-07-10 17:51 mainvg-lfs--install
brw-rw---- 1 root disk 254,  1 2006-07-10 17:51 mainvg-oldhome
brw-rw---- 1 root disk 254,  3 2006-07-10 17:51 mainvg-swaplv
brw-rw---- 1 root disk 254,  6 2006-07-10 17:51 mainvg-vm

Now I attempt to create a test volume that should receive a minor number
20:

home:~# lvcreate -M y --major 254 --minor 20 -L 1 -n test mainvg
File descriptor 3 left open
File descriptor 5 left open
File descriptor 7 left open
  Rounding up size to full physical extent 4,00 MB
  Logical volume "test" created

Result:

home:~# ls -l /dev/mapper
total 0
crw------- 1 root root  10, 63 2006-06-30 21:03 control
brw-rw---- 1 root disk 254,  0 2006-07-10 17:51 mainvg-boot
brw-rw---- 1 root disk 254,  8 2006-07-10 17:51 mainvg-etch
brw-rw---- 1 root disk 254,  4 2006-07-10 17:51 mainvg-etchroot
brw-rw---- 1 root disk 254,  5 2006-07-10 17:51 mainvg-home
brw-rw---- 1 root disk 254,  2 2006-07-10 17:51 mainvg-lfs
brw-rw---- 1 root disk 254,  7 2006-07-10 17:51 mainvg-lfs--install
brw-rw---- 1 root disk 254,  1 2006-07-10 17:51 mainvg-oldhome
brw-rw---- 1 root disk 254,  3 2006-07-10 17:51 mainvg-swaplv
brw-rw---- 1 root disk 254,  9 2006-07-10 18:44 mainvg-test
brw-rw---- 1 root disk 254,  6 2006-07-10 17:51 mainvg-vm

The minor is 9, not 20! Bug.

BTW I am not sure about "normal" severity. This can potentially lead to data
loss (overwriting a different LVM volume than intended) if one puts swap
on LVM and attempts setting up software suspend on that volume.

-- System Information:
Debian Release: testing/unstable
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.15-1-686
Locale: LANG=ru_RU.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8)

Versions of packages lvm2 depends on:
ii  debconf [debconf-2.0]        1.5.2       Debian configuration management sy
ii  libc6                        2.3.6-15    GNU C Library: Shared libraries
ii  libdevmapper1.02             2:1.02.07-1 The Linux Kernel Device Mapper use
ii  libncurses5                  5.5-2       Shared libraries for terminal hand
ii  libreadline5                 5.1-7       GNU readline and history libraries
ii  libselinux1                  1.30-1      SELinux shared libraries
ii  libsepol1                    1.12-1      Security Enhanced Linux policy lib
ii  lvm-common                   1.5.20      The Logical Volume Manager for Lin

lvm2 recommends no packages.

-- debconf information:
  lvm2/snapshots:




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