OBSOLETE_CNODE
ubifs_assert(c, !test_bit(OBSOLETE_CNODE, &nnode->flags));
__set_bit(OBSOLETE_CNODE, &nnode->flags);
ubifs_assert(c, !test_bit(OBSOLETE_CNODE, &pnode->flags));
__set_bit(OBSOLETE_CNODE, &pnode->flags);
if (test_bit(OBSOLETE_CNODE, &cnode->flags))