tree 3e0f8e1bd5474822431cffd1e449df9b639e1772
parent a447c0932445f92ce6f4c1bd020f62c5097a7842
author Mark Fasheh <mfasheh@suse.com> 1216675756 -0700
committer Mark Fasheh <mfasheh@suse.com> 1223931477 -0700

ocfs2: POSIX file locks support

This is actually pretty easy since fs/dlm already handles the bulk of the
work. The Ocfs2 userspace cluster stack module already uses fs/dlm as the
underlying lock manager, so I only had to add the right calls.

Cluster-aware POSIX locks ("plocks") can be turned off by the same means at
UNIX locks - mount with 'noflocks', or create a local-only Ocfs2 volume.
Internally, the file system uses two sets of file_operations, depending on
whether cluster aware plocks is required. This turns out to be easier than
implementing local-only versions of ->lock.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>