/** * Determine if the lock is compatible with all locks on the queue. * * If \a work_list is provided, conflicting locks are linked there. * If \a work_list is not provided, we exit this function on first conflict. * * \retval 0 if there are conflicting locks in the \a queue * \retval 1 if the lock is compatible to all locks in \a queue */ static inline int ldlm_plain_compat_queue(struct list_head *queue, struct ldlm_lock *req, struct list_head *work_list) { enum ldlm_mode req_mode = req->l_req_mode; struct ldlm_lock *lock, *next_lock; int compat = 1; ENTRY; lockmode_verify(req_mode); list_for_each_entry_safe(lock, next_lock, queue, l_res_link) { /* We stop walking the queue if we hit ourselves so we don't * take conflicting locks enqueued after us into account, * or we'd wait forever. */ if (req == lock) RETURN(compat); /* Advance loop cursor to last lock of mode group. */ next_lock = list_entry(list_entry(lock->l_sl_mode.prev, struct ldlm_lock, l_sl_mode)->l_res_link.next, struct ldlm_lock, l_res_link); if (lockmode_compat(lock->l_req_mode, req_mode)) continue; if (!work_list) RETURN(0); compat = 0; /* Add locks of the mode group to \a work_list as * blocking locks for \a req. */ if (lock->l_blocking_ast) ldlm_add_ast_work_item(lock, req, work_list); { struct list_head *head; head = &lock->l_sl_mode; list_for_each_entry(lock, head, l_sl_mode) if (lock->l_blocking_ast) ldlm_add_ast_work_item(lock, req, work_list); } } RETURN(compat); }
static inline int ldlm_plain_compat_queue(cfs_list_t *queue, struct ldlm_lock *req, cfs_list_t *work_list) { cfs_list_t *tmp; struct ldlm_lock *lock; ldlm_mode_t req_mode = req->l_req_mode; int compat = 1; ENTRY; lockmode_verify(req_mode); cfs_list_for_each(tmp, queue) { lock = cfs_list_entry(tmp, struct ldlm_lock, l_res_link); if (req == lock) RETURN(compat); /* last lock in mode group */ tmp = &cfs_list_entry(lock->l_sl_mode.prev, struct ldlm_lock, l_sl_mode)->l_res_link; if (lockmode_compat(lock->l_req_mode, req_mode)) continue; if (!work_list) RETURN(0); compat = 0; /* add locks of the mode group to @work_list as * blocking locks for @req */ if (lock->l_blocking_ast) ldlm_add_ast_work_item(lock, req, work_list); { cfs_list_t *head; head = &lock->l_sl_mode; cfs_list_for_each_entry(lock, head, l_sl_mode) if (lock->l_blocking_ast) ldlm_add_ast_work_item(lock, req, work_list); } }
/* Determine if the lock is compatible with all locks on the queue. */ static int ldlm_inodebits_compat_queue(cfs_list_t *queue, struct ldlm_lock *req, cfs_list_t *work_list) { cfs_list_t *tmp; struct ldlm_lock *lock; ldlm_mode_t req_mode = req->l_req_mode; __u64 req_bits = req->l_policy_data.l_inodebits.bits; int compat = 1; ENTRY; LASSERT(req_bits); /* There is no sense in lock with no bits set, I think. Also such a lock would be compatible with any other bit lock */ cfs_list_for_each(tmp, queue) { cfs_list_t *mode_tail; lock = cfs_list_entry(tmp, struct ldlm_lock, l_res_link); if (req == lock) RETURN(compat); /* last lock in mode group */ LASSERT(lock->l_sl_mode.prev != NULL); mode_tail = &cfs_list_entry(lock->l_sl_mode.prev, struct ldlm_lock, l_sl_mode)->l_res_link; /* locks are compatible, bits don't matter */ if (lockmode_compat(lock->l_req_mode, req_mode)) { /* jump to last lock in mode group */ tmp = mode_tail; continue; } for (;;) { cfs_list_t *head; /* last lock in policy group */ tmp = &cfs_list_entry(lock->l_sl_policy.prev, struct ldlm_lock, l_sl_policy)->l_res_link; /* locks with bits overlapped are conflicting locks */ if (lock->l_policy_data.l_inodebits.bits & req_bits) { /* COS lock from the same client is not conflicting */ if (lock->l_req_mode == LCK_COS && lock->l_client_cookie == req->l_client_cookie) goto not_conflicting; /* conflicting policy */ if (!work_list) RETURN(0); compat = 0; /* add locks of the policy group to * @work_list as blocking locks for * @req */ if (lock->l_blocking_ast) ldlm_add_ast_work_item(lock, req, work_list); head = &lock->l_sl_policy; cfs_list_for_each_entry(lock, head, l_sl_policy) if (lock->l_blocking_ast) ldlm_add_ast_work_item(lock, req, work_list); } not_conflicting: if (tmp == mode_tail) break; tmp = tmp->next; lock = cfs_list_entry(tmp, struct ldlm_lock, l_res_link); } /* loop over policy groups within one mode group */ } /* loop over mode groups within @queue */