[GFS2] Function meta_read optimization

This patch optimizes function gfs2_meta_read.  Basically, gfs2_meta_wait
was being called regardless of whether a disk read was requested.
This just pulls that wait into the if that triggers the read.
Signed-off-by: NBob Peterson <rpeterso@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

fs/gfs2/meta_io.c

@@ -222,7 +222,7 @@ int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
 		   struct buffer_head **bhp)
 {
 	*bhp = getbuf(gl, blkno, CREATE);
-	if (!buffer_uptodate(*bhp))
+	if (!buffer_uptodate(*bhp)) {
 		ll_rw_block(READ_META, 1, bhp);
 		if (flags & DIO_WAIT) {
 			int error = gfs2_meta_wait(gl->gl_sbd, *bhp);
@@ -231,6 +231,7 @@ int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
 				return error;
 			}
 		}
+	}
 
 	return 0;
 }