[GFS2] Use mutices rather than semaphores

As well as a number of minor bug fixes, this patch changes GFS
to use mutices rather than semaphores. This results in better
information in case there are any locking problems.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --cc fs/gfs2/glock.c
Simple merge

diff --cc fs/gfs2/incore.h
Simple merge

diff --cc fs/gfs2/inode.c
Simple merge

diff --cc fs/gfs2/log.c
Simple merge

diff --cc fs/gfs2/log.h
Simple merge

diff --cc fs/gfs2/lops.c
Simple merge

diff --cc fs/gfs2/meta_io.c
Simple merge

diff --cc fs/gfs2/ops_address.c
Simple merge

diff --cc fs/gfs2/ops_file.c
Simple merge

diff --cc fs/gfs2/ops_fstype.c
Simple merge

diff --cc fs/gfs2/ops_super.c
Simple merge

diff --cc fs/gfs2/quota.c
Simple merge

diff --cc fs/gfs2/rgrp.c
Simple merge

diff --cc fs/gfs2/super.c
Simple merge

diff --cc fs/gfs2/sys.c
Simple merge

diff --cc fs/gfs2/trans.c
Simple merge

diff --cc fs/gfs2/unlinked.c
Simple merge