[Ocfs2-tools-devel] [PATCH 3/3] tunefs.ocfs2: Add the cloned_volume operation.

[Sunil Mushran]

Joel Becker wrote:
> Users with SANs often want to create clones or snapshots of ocfs2 volumes.
> However, these volumes cannot be mounted, because the original volume
> has the same UUID and is still in use.
>
> The cloned_volume operation will reset the UUID and label of the given
> device.  It cannot check with the cluster stack, so it must call
> tunefs_interact_critical().
>
> The --cloned-volume option has an optional <new-label> argument.  If
> specified, the volume's label will be set to <new-label>.  If not, the
> current volume label with have '-cloned' appended to it.  If the label
> already ends in '-cloned', it is not modified.  The label will be
> truncated to fit '-cloned'.
>
> Because op_cloned_volume cannot start the cluster stack, a new
> tunefs_open() flag is provided: TUNFES_FLAG_SKIPCLUSTER.  This skips all
> cluster initialization.  Operations using TUNEFS_FLAG_SKIPCLUSTER are
> run before operations specifying TUNEFS_FLAG_NOCLUSTER.
>
> Signed-off-by: Joel Becker <joel.becker at oracle.com>
>   
Signed-off-by: Sunil Mushran <sunil.mushran at oracle.com>