[Bug 1332139] Re: Resizing dmraid partition removes device path entry

[Curtis Gedak]

Hi Phillip,

Good news!  This problem does not exist with Ubuntu 15.10.

I booted my computer using the ubuntu-15.10-desktop-i386.iso image,
and then successfully grew a 20 GiB ext4 partition to 40 GiB on my
Intel Software RAID (Fake RAID).

Following are the details of the successful test.

*** Boot ubuntu 15.10 i386 from Live CD (before running GParted)

ubuntu at ubuntu:~$ ls -l /dev/mapper
total 0
crw------- 1 root root  10, 236 Nov 11 21:40 control
brw-rw---- 1 root disk 252,   1 Nov 11 21:39 isw_efjbbijhh_Vol0
lrwxrwxrwx 1 root root        7 Nov 11 21:40 isw_efjbbijhh_Vol0p1 -> ../dm-0
ubuntu at ubuntu:~$ ls -l /dev/dm*
brw-rw---- 1 root disk 252, 0 Nov 11 21:40 /dev/dm-0
brw-rw---- 1 root disk 252, 1 Nov 11 21:40 /dev/dm-1
ubuntu at ubuntu:~$

*** Use GParted to queue and apply operation to grow ext4 partition
    from 20 GiB to 40 GiB

ubuntu at ubuntu:~$ sudo gparted
======================
libparted : 3.2
======================
ubuntu at ubuntu:~$

*** SUCCESS!

*** Device entries after successful resize.

ubuntu at ubuntu:~$ ls -l /dev/mapper
total 0
crw------- 1 root root  10, 236 Nov 11 21:40 control
brw-rw---- 1 root disk 252,   1 Nov 11 21:46 isw_efjbbijhh_Vol0
lrwxrwxrwx 1 root root        7 Nov 11 21:47 isw_efjbbijhh_Vol0p1 -> ../dm-0
ubuntu at ubuntu:~$ ls -l /dev/dm*
brw-rw---- 1 root disk 252, 0 Nov 11 21:47 /dev/dm-0
brw-rw---- 1 root disk 252, 1 Nov 11 21:40 /dev/dm-1
ubuntu at ubuntu:~$

Based on this test I suggest this problem be closed as resolved with
ubuntu 15.10.  :-)

Curtis


** Attachment added: "gparted_details-ubuntu1510-dm-grow.htm"
   https://bugs.launchpad.net/ubuntu/+source/gparted/+bug/1332139/+attachment/4517232/+files/gparted_details-ubuntu1510-dm-grow.htm

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https://bugs.launchpad.net/bugs/1332139

Title:
  Resizing dmraid partition removes device path entry

Status in gparted package in Ubuntu:
  New

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 at 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 at 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 at ubuntu:~$ ls -l /dev/md*
  ls: cannot access /dev/md*: No such file or directory
  ubuntu at ubuntu:~$

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

  ubuntu at 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 at 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 at ubuntu:~$ ls -l /dev/md*
  ls: cannot access /dev/md*: No such file or directory
  ubuntu at 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 at 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 at 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 at ubuntu:~$ ls -l /dev/md*
  ls: cannot access /dev/md*: No such file or directory
  ubuntu at ubuntu:~$

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

  ubuntu at ubuntu:~$ sudo kpartx -l /dev/mapper/isw_efjbbijhh_Vol0
  isw_efjbbijhh_Vol0p1 : 0 83886080 /dev/mapper/isw_efjbbijhh_Vol0 2048
  ubuntu at ubuntu:~$ sudo kpartx -a /dev/mapper/isw_efjbbijhh_Vol0
  ubuntu at 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 at 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.

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