[GFS2] Add an additional argument to gfs2_trans_add_bh()

This adds an extra argument to gfs2_trans_add_bh() to indicate whether the
bh being added to the transaction is metadata or data. Its currently unused
since all existing callers set it to 1 (metadata) but following patches will
make use of it.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/acl.c b/fs/gfs2/acl.c
index 33c465a..9482a67 100644
--- a/fs/gfs2/acl.c
+++ b/fs/gfs2/acl.c
@@ -202,7 +202,7 @@
 		gfs2_assert_withdraw(sdp,
 				(ip->i_di.di_mode & S_IFMT) == (mode & S_IFMT));
 		ip->i_di.di_mode = mode;
-		gfs2_trans_add_bh(ip->i_gl, dibh);
+		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 		gfs2_dinode_out(&ip->i_di, dibh->b_data);
 		brelse(dibh);
 	}