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

[Jeff Strunk]

https://launchpad.net/~yofel/+archive/btrfs has an up to date package
for btrfs-tools with this functionality. The package in Precise appears
to be a snapshot from June 2010.

# dpkg -i btrfs-tools_0.19+20120421-0daily6~bzr457~precise1_amd64.deb 
(Reading database ... 108869 files and directories currently installed.)
Preparing to replace btrfs-tools 0.19+20100601-3ubuntu3 (using btrfs-tools_0.19+20120421-0daily6~bzr457~precise1_amd64.deb) ...
Unpacking replacement btrfs-tools ...
Setting up btrfs-tools (0.19+20120421-0daily6~bzr457~precise1) ...
Processing triggers for man-db ...
# btrfs subvolume snapshot -r /export/ftp /export/ftp/.snapshot/hardy
Create a readonly snapshot of '/export/ftp' in '/export/ftp/.snapshot/hardy'

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https://bugs.launchpad.net/bugs/924621

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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