JFFS2_SB_FLAG_BUILDING
c->flags |= JFFS2_SB_FLAG_BUILDING;
c->flags &= ~JFFS2_SB_FLAG_BUILDING;
if (!(c->flags & (JFFS2_SB_FLAG_BUILDING|JFFS2_SB_FLAG_SCANNING)))
!(c->flags & (JFFS2_SB_FLAG_SCANNING | JFFS2_SB_FLAG_BUILDING))) {
(c->flags & JFFS2_SB_FLAG_BUILDING)) {
BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING)));
BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING));