[Bug 1012946] Re: dm-part-sync.patch breaks creating multiple partitions on a LVM volume

[Stéphane Graber]

** Changed in: parted (Ubuntu Precise)
    Milestone: ubuntu-12.04.1 => ubuntu-12.04.2

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https://bugs.launchpad.net/bugs/1012946

Title:
  dm-part-sync.patch breaks creating multiple partitions on a LVM volume

Status in “parted” package in Ubuntu:
  Fix Released
Status in “parted” source package in Precise:
  Fix Committed
Status in “parted” source package in Quantal:
  Fix Released

Bug description:
  [IMPACT]

  The patch dm-part-sync.patch, added during the precise development
  cycle, caused a regression wherein users are unable to use parted to
  manipulate partitions contained within an LVM logical volume under
  either of two conditions:

  1) You specify the "disk" using the /dev/VG/LV symlink rather than
  /dev/mapper/vg-lv

  2) There is more than one partition within the "disk"

  In addition to LVM, this should also apply to dmraid disks.

  The first problem is fixed by looking up the canonical /dev/mapper/
  device name of the disk, and using that as the base name when building
  the names of the partition devices.  The second problem is fixed by
  assuming that dm disks can hold MAX_NUM_PARTS partitions, rather than
  looking up what the kernel reports in the sysfs ext_range attribute,
  which is just one.

  [TESTCASE]

  # lvcreate -n test -L 10M matrix
    Rounding up size to full physical extent 12.00 MiB
    Logical volume "test" created
  # parted --script -- /dev/matrix/test mklabel msdos
  # parted --script -- /dev/matrix/test mkpart primary ext4 1 2
  # parted --script -- /dev/matrix/test mkpart primary ext4 3 4
  device-mapper: create ioctl failed: Device or resource busy
  Error: Failed to add partition 1 (No such device or address)
  # ls /dev/mapper/matrix-test*
  /dev/mapper/matrix-test
  /dev/mapper/matrix-test1

  [Regression Potential]

  The changes are unlikely to impact anything other than using parted on
  dm devices, which is essentially broken in its current state.

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