gfs2: Protect gl->gl_object by spin lock

Put all remaining accesses to gl->gl_object under the
gl->gl_lockref.lock spinlock to prevent races.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>

fs/gfs2/rgrp.c

@@ -705,9 +705,7 @@ void gfs2_clear_rgrpd(struct gfs2_sbd *sdp)
 		rb_erase(n, &sdp->sd_rindex_tree);
 
 		if (gl) {
-			spin_lock(&gl->gl_lockref.lock);
-			gl->gl_object = NULL;
-			spin_unlock(&gl->gl_lockref.lock);
+			glock_set_object(gl, NULL);
 			gfs2_glock_add_to_lru(gl);
 			gfs2_glock_put(gl);
 		}
@@ -917,7 +915,7 @@ static int read_rindex_entry(struct gfs2_inode *ip)
 	error = rgd_insert(rgd);
 	spin_unlock(&sdp->sd_rindex_spin);
 	if (!error) {
-		rgd->rd_gl->gl_object = rgd;
+		glock_set_object(rgd->rd_gl, rgd);
 		rgd->rd_gl->gl_vm.start = (rgd->rd_addr * bsize) & PAGE_MASK;
 		rgd->rd_gl->gl_vm.end = PAGE_ALIGN((rgd->rd_addr +
 						    rgd->rd_length) * bsize) - 1;