Resizing dmraid partition removes device path entry

Bug #1332139 reported by Curtis Gedak on 2014-06-19
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
gparted (Ubuntu)
Undecided
Unassigned

Bug Description

I booted my computer using the ubuntu-14.04-desktop-i386.iso image, and then tried to grow a 20 GiB ext4 partition to 40 GiB. Unfortunately this failed because at some point the underlying /dev/mapper partition entry disappeared.

Following are some details from before and after the grow operation:

*** Boot ubuntu 14.04 i386 from Live CD (before running GParted)

ubuntu@ubuntu:~$ ls -l /dev/mapper
total 0
crw------- 1 root root 10, 236 Jun 12 16:43 control
brw-rw---- 1 root disk 252, 1 Jun 12 16:43 isw_efjbbijhh_Vol0
brw------- 1 root root 252, 0 Jun 12 16:43 isw_efjbbijhh_Vol0p1
ubuntu@ubuntu:~$ ls -l /dev/dm*
brw-rw---- 1 root disk 252, 0 Jun 12 16:43 /dev/dm-0
brw-rw---- 1 root disk 252, 1 Jun 12 16:43 /dev/dm-1
ubuntu@ubuntu:~$ ls -l /dev/md*
ls: cannot access /dev/md*: No such file or directory
ubuntu@ubuntu:~$

*** Start GParted, but do not perform any operations

ubuntu@ubuntu:~$ ls -l /dev/mapper
total 0
crw------- 1 root root 10, 236 Jun 12 16:43 control
brw-rw---- 1 root disk 252, 1 Jun 12 16:43 isw_efjbbijhh_Vol0
brw------- 1 root root 252, 0 Jun 12 16:43 isw_efjbbijhh_Vol0p1
ubuntu@ubuntu:~$ ls -l /dev/dm*
brw-rw---- 1 root disk 252, 0 Jun 12 16:43 /dev/dm-0
brw-rw---- 1 root disk 252, 1 Jun 12 16:43 /dev/dm-1
ubuntu@ubuntu:~$ ls -l /dev/md*
ls: cannot access /dev/md*: No such file or directory
ubuntu@ubuntu:~$

*** Queue and Apply operation to grow ext4 partition from 20 GiB to 40 GiB
*** --> FAILS - see attached gparted_details-ubuntu1404-dm-grow.htm log file

ubuntu@ubuntu:~$ ls -l /dev/mapper
total 0
crw------- 1 root root 10, 236 Jun 12 16:43 control
brw-rw---- 1 root disk 252, 1 Jun 12 16:50 isw_efjbbijhh_Vol0
ubuntu@ubuntu:~$ ls -l /dev/dm*
brw-rw---- 1 root disk 252, 0 Jun 12 16:50 /dev/dm-0
brw-rw---- 1 root disk 252, 1 Jun 12 16:43 /dev/dm-1
ubuntu@ubuntu:~$ ls -l /dev/md*
ls: cannot access /dev/md*: No such file or directory
ubuntu@ubuntu:~$

*** The missing entry can be re-added using kpartx

ubuntu@ubuntu:~$ sudo kpartx -l /dev/mapper/isw_efjbbijhh_Vol0
isw_efjbbijhh_Vol0p1 : 0 83886080 /dev/mapper/isw_efjbbijhh_Vol0 2048
ubuntu@ubuntu:~$ sudo kpartx -a /dev/mapper/isw_efjbbijhh_Vol0
ubuntu@ubuntu:~$ ls -l /dev/mapper
total 0
crw------- 1 root root 10, 236 Jun 12 16:43 control
brw-rw---- 1 root disk 252, 1 Jun 12 16:50 isw_efjbbijhh_Vol0
brw-rw---- 1 root disk 252, 0 Jun 12 16:57 isw_efjbbijhh_Vol0p1
ubuntu@ubuntu:~$

*** I tried several other operations. The one thing in common is that the partition entry in /dev/mapper disappears whenever a change it made to it by GParted through the libparted library.

Curtis Gedak (gedakc) wrote :

gparted_details.htm log file that failed when attempting to grow an ext4 20 GiB dmraid partition to 40 GiB.

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