[Bug 1274320]

[amoloney]

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https://bugs.launchpad.net/bugs/1274320

Title:
  Error: diskfilter writes are not supported

Status in grub:
  Unknown
Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2-signed package in Ubuntu:
  Fix Released
Status in grub2 source package in Trusty:
  Fix Released
Status in grub2-signed source package in Trusty:
  Fix Released
Status in grub2 source package in Vivid:
  Fix Released
Status in grub2-signed source package in Vivid:
  Fix Released
Status in grub2 package in Debian:
  Fix Released
Status in grub2 package in Fedora:
  Confirmed

Bug description:
  [Impact]
  RAID and LVM users may run into a cryptic warning on boot from GRUB; because some variants of RAID and LVM are not supported for writing by GRUB itself. GRUB would typically try to write a tiny file to the boot partition for things like remembering the last selected boot entry.

  [Test Case]
  On an affected system (typically any RAID/LVM setup where the boot device is on RAID or on a LVM device), try to boot. Without the patch, the message will appear, otherwise it will not.

  [Regression Potential]
  The potential for regression is minimal as the patch involves enforcing the fact that diskfilter writes are unsupported by grub in menu building scripts, which will automatically avoid enabling recordfail (the offending feature which saves GRUB's state) if the boot partition is detected to be on a device which does not support diskfilter writes.

  ----

  Once grub chooses what to boot to, an error shows up and will sit on
  the screen for approx. 5 seconds

  "Error: diskfilter writes are not supported.
  Press any key to continue..."

  From what I understand, this error is related to raid partitions, and
  I have two of them (md0, md1). Both partitions are used (root and
  swap). Raid is assembled with mdadm and are raid0

  This error message started appearing right after grub2 was updated on
  01/27/2014.

  System:    Kernel: 3.13.0-5-generic x86_64 (64 bit) Desktop: KDE 4.11.5 Distro: Ubuntu 14.04 trusty
  Drives:    HDD Total Size: 1064.2GB (10.9% used)
          1: id: /dev/sda model: SanDisk_SDSSDRC0 size: 32.0GB
          2: id: /dev/sdb model: SanDisk_SDSSDRC0 size: 32.0GB
          3: id: /dev/sdc model: ST31000528AS size: 1000.2GB
  RAID:      Device-1: /dev/md1 - active raid: 0 components: online: sdb2 sda3 (swap)       Device-2: /dev/md0 - active raid: 0 components: online: sdb1 sda1 ( / )
  Grub2:    grub-efi-amd64 version 2.02~beta2-5

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: grub-efi-amd64 2.02~beta2-5
  ProcVersionSignature: Ubuntu 3.13.0-5.20-generic 3.13.0
  Uname: Linux 3.13.0-5-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.13.2-0ubuntu2
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Wed Jan 29 17:37:59 2014
  SourcePackage: grub2
  UpgradeStatus: Upgraded to trusty on 2014-01-23 (6 days ago)

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