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

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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/

** Affects: btrfs-tools (Ubuntu)
     Importance: Undecided
         Status: Confirmed

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btrfs: Option to create read-only snapshot does not exist
https://bugs.launchpad.net/bugs/924621
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