[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/ops_address.c b/fs/gfs2/ops_address.c
index 0aa5f14..d352b35 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -368,7 +368,7 @@
 		if (error)
 			goto fail;
 
-		gfs2_trans_add_bh(ip->i_gl, dibh);
+		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 
 		kaddr = kmap(page);
 		memcpy(dibh->b_data + sizeof(struct gfs2_dinode) + from,