From: Mark Fasheh <mfasheh@suse.com>
Date: Mon, 21 Jul 2008 21:29:16 +0000 (-0700)
Subject: ocfs2: POSIX file locks support
X-Git-Tag: v2.6.28-rc1~572^2~55
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=53da4939f349d4edd283b043219221ca5b78e4d4;p=pandora-kernel.git

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>
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