[Bug 748340] Re: btrfsck fails with "unsupported option features", must [ignore] to boot

[John Lewis]

@AvitarX LZO compression is not a red herring. It only appears to happen
if you have a separate btrfs file-system from root AND you have balanced
it (must be some difference between the way the root filesystem and home
filesystems are checked on boot).

So steps to reproduce are:-

1. Fresh install of Natty with /boot as EXT4, / as BTRFS and /home as
BTRFS.

2. Change mount options in /etc/fstab to include "compress=lzo".

3. Remount (mount -o remount /home) or reboot.

4. Balance filesystem "btrfs fi balance /home" and bingo borked btrfsck
:)

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https://bugs.launchpad.net/bugs/748340

Title:
  btrfsck fails with "unsupported option features", must [ignore] to
  boot

Status in “btrfs-tools” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: btrfs-tools

  current btrfsck on natty reports:
  couldn't open because of unsupported option features (2).
  fsck.btrfs: disk-io.c:683: open_ctree_fd: Assertion `!(1)' failed.
  ...if invoked on the standard root/home.

  Meaning that when the link fsck.btrfs -> btrfsck was enabled as per Bug #660649 my system now stops booting with this message:
  fsck from util-linux-ng 2.17.2
  fsck from util-linux-ng 2.17.2
  fsck from util-linux-ng 2.17.2
  couldn't open because of unsupported option features (2).
  fsck.btrfs: disk-io.c:683: open_ctree_fd: Assertion `!(1)' failed.
  Warning... fsck.btrfs for device /dev/sda5 exited with signal 6.
  mountall: fsck /home [313] terminated with status 8
  mountall: Unrecoverable fsck error: /home
  couldn't open because of unsupported option features (2).
  fsck.btrfs: disk-io.c:683: open_ctree_fd: Assertion `!(1)' failed.
  Warning... fsck.btrfs for device /dev/sda5 exited with signal 6.
  mountall: fsck / [312] terminated with status 8
  mountall: Unrecoverable fsck error: /
  /dev/sda1: clean, 233/48768 files, 44709/194560 blocks
  init: udev-fallback-graphics main process (625) terminated with status 1

  If [I] is pressed to ignore errors booting can be done normally, just bypassing btrfsck completely.
  --- 
  Architecture: amd64
  DistroRelease: Ubuntu 11.04
  Package: btrfs-tools 0.19+20100601-3ubuntu2
  PackageArchitecture: amd64
  ProcEnviron:
   SHELL=/bin/bash
   LANG=en_GB.UTF-8
   LANGUAGE=en_GB:en
  ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
  Tags:  natty
  Uname: Linux 2.6.38-7-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare