extern int ll_have_md_lock(struct inode *inode, __u64 *bits,
enum ldlm_mode l_req_mode);
extern enum ldlm_mode ll_take_md_lock(struct inode *inode, __u64 bits,
extern int ll_have_md_lock(struct inode *inode, __u64 *bits,
enum ldlm_mode l_req_mode);
extern enum ldlm_mode ll_take_md_lock(struct inode *inode, __u64 bits,