[Bug 924621] Re: btrfs: Option to create read-only snapshot does not exist

[Gary M]

*** This bug is a duplicate of bug 894456 ***
    https://bugs.launchpad.net/bugs/894456

** This bug has been marked a duplicate of bug 894456
   Please merge or sync new btrfs-tools from Debian testing or unstable - lots of bugs present in Ubuntu now :(

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Title:
  btrfs: Option to create read-only snapshot does not exist

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

Bug description:
  According to the Btrfs wiki [1], Btrfs supports read-only snapshots.

      NEWS
      Linux 2.6.38 released (March 2011) LZO compression. Forced read-only mode for handling filesystem errors. Read-only snapshots.

  Read-only snapshots should be created with the command `btrfs
  subvolume snapshot -r volume nameofsnapshot [2] [3].

  However, the option to support this does not exist on Ubuntu 11.10:

      $ btrfs subvolume snapshot -r /u1 /u1/.snapshot/test
      ERROR: 'subvolume snapshot' requires 2 arg(s)

  [1] https://btrfs.wiki.kernel.org/#News
  [2] http://article.gmane.org/gmane.comp.file-systems.btrfs/14173/match=read+only+snapshot
  [3] http://blog.dailystuff.nl/2012/01/btrfs-and-readonly-snapshots/

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