GFS2: Check for glock already held in gfs2_getxattr
Since the introduction of atomic_open, gfs2_getxattr can be called with the glock already held, so we need to allow for this. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Reported-by: David Teigland <teigland@redhat.com> Tested-by: David Teigland <teigland@redhat.com>
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