dentry2          2904 fs/dcache.c    void d_exchange(struct dentry *dentry1, struct dentry *dentry2)
dentry2          2909 fs/dcache.c    	WARN_ON(!dentry2->d_inode);
dentry2          2911 fs/dcache.c    	WARN_ON(IS_ROOT(dentry2));
dentry2          2913 fs/dcache.c    	__d_move(dentry1, dentry2, true);