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

[Carey Underwood]

The btrfs-tools in ubuntu are quite old, and don't support several
features which exist.  The "unsupported option features (2)" shows which
specific flag is unknown, and can be looked up in the kernel sources at
/fs/btrfs/ctree.h (look for BTRFS_FEATURE_INCOMPAT_*).

It's not terribly critical however, as btrfsck doesn't make any repairs
to the filesystem yet, it's purely a diagnostic tool at the moment.

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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

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