/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * * GPL HEADER START * * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 only, * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License version 2 for more details (a copy is included * in the LICENSE file that accompanied this code). * * You should have received a copy of the GNU General Public License * version 2 along with this program; If not, see * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * * GPL HEADER END */ /* * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. * Use is subject to license terms. * * Copyright (c) 2011 Whamcloud, Inc. * */ /* * This file is part of Lustre, http://www.lustre.org/ * Lustre is a trademark of Sun Microsystems, Inc. * * lustre/ldlm/ldlm_lockd.c * * Author: Peter Braam * Author: Phil Schwan */ #ifndef EXPORT_SYMTAB # define EXPORT_SYMTAB #endif #define DEBUG_SUBSYSTEM S_LDLM #ifdef __KERNEL__ # include #else # include #endif #include #include #include #include "ldlm_internal.h" #ifdef __KERNEL__ static int ldlm_num_threads; CFS_MODULE_PARM(ldlm_num_threads, "i", int, 0444, "number of DLM service threads to start"); #endif extern cfs_mem_cache_t *ldlm_resource_slab; extern cfs_mem_cache_t *ldlm_lock_slab; static cfs_semaphore_t ldlm_ref_sem; static int ldlm_refcount; struct ldlm_cb_async_args { struct ldlm_cb_set_arg *ca_set_arg; struct ldlm_lock *ca_lock; }; /* LDLM state */ static struct ldlm_state *ldlm_state; inline cfs_time_t round_timeout(cfs_time_t timeout) { return cfs_time_seconds((int)cfs_duration_sec(cfs_time_sub(timeout, 0)) + 1); } /* timeout for initial callback (AST) reply (bz10399) */ static inline unsigned int ldlm_get_rq_timeout(void) { /* Non-AT value */ unsigned int timeout = min(ldlm_timeout, obd_timeout / 3); return timeout < 1 ? 1 : timeout; } #ifdef __KERNEL__ /* w_l_spinlock protects both waiting_locks_list and expired_lock_thread */ static cfs_spinlock_t waiting_locks_spinlock; /* BH lock (timer) */ static cfs_list_t waiting_locks_list; static cfs_timer_t waiting_locks_timer; static struct expired_lock_thread { cfs_waitq_t elt_waitq; int elt_state; int elt_dump; cfs_list_t elt_expired_locks; } expired_lock_thread; #endif #define ELT_STOPPED 0 #define ELT_READY 1 #define ELT_TERMINATE 2 struct ldlm_bl_pool { cfs_spinlock_t blp_lock; /* * blp_prio_list is used for callbacks that should be handled * as a priority. It is used for LDLM_FL_DISCARD_DATA requests. * see bug 13843 */ cfs_list_t blp_prio_list; /* * blp_list is used for all other callbacks which are likely * to take longer to process. */ cfs_list_t blp_list; cfs_waitq_t blp_waitq; cfs_completion_t blp_comp; cfs_atomic_t blp_num_threads; cfs_atomic_t blp_busy_threads; int blp_min_threads; int blp_max_threads; }; struct ldlm_bl_work_item { cfs_list_t blwi_entry; struct ldlm_namespace *blwi_ns; struct ldlm_lock_desc blwi_ld; struct ldlm_lock *blwi_lock; cfs_list_t blwi_head; int blwi_count; cfs_completion_t blwi_comp; int blwi_mode; int blwi_mem_pressure; }; #ifdef __KERNEL__ static inline int have_expired_locks(void) { int need_to_run; ENTRY; cfs_spin_lock_bh(&waiting_locks_spinlock); need_to_run = !cfs_list_empty(&expired_lock_thread.elt_expired_locks); cfs_spin_unlock_bh(&waiting_locks_spinlock); RETURN(need_to_run); } static int expired_lock_main(void *arg) { cfs_list_t *expired = &expired_lock_thread.elt_expired_locks; struct l_wait_info lwi = { 0 }; int do_dump; ENTRY; cfs_daemonize("ldlm_elt"); expired_lock_thread.elt_state = ELT_READY; cfs_waitq_signal(&expired_lock_thread.elt_waitq); while (1) { l_wait_event(expired_lock_thread.elt_waitq, have_expired_locks() || expired_lock_thread.elt_state == ELT_TERMINATE, &lwi); cfs_spin_lock_bh(&waiting_locks_spinlock); if (expired_lock_thread.elt_dump) { cfs_spin_unlock_bh(&waiting_locks_spinlock); /* from waiting_locks_callback, but not in timer */ libcfs_debug_dumplog(); libcfs_run_lbug_upcall(__FILE__, "waiting_locks_callback", expired_lock_thread.elt_dump); cfs_spin_lock_bh(&waiting_locks_spinlock); expired_lock_thread.elt_dump = 0; } do_dump = 0; while (!cfs_list_empty(expired)) { struct obd_export *export; struct ldlm_lock *lock; lock = cfs_list_entry(expired->next, struct ldlm_lock, l_pending_chain); if ((void *)lock < LP_POISON + CFS_PAGE_SIZE && (void *)lock >= LP_POISON) { cfs_spin_unlock_bh(&waiting_locks_spinlock); CERROR("free lock on elt list %p\n", lock); LBUG(); } cfs_list_del_init(&lock->l_pending_chain); if ((void *)lock->l_export < LP_POISON + CFS_PAGE_SIZE && (void *)lock->l_export >= LP_POISON) { CERROR("lock with free export on elt list %p\n", lock->l_export); lock->l_export = NULL; LDLM_ERROR(lock, "free export"); /* release extra ref grabbed by * ldlm_add_waiting_lock() or * ldlm_failed_ast() */ LDLM_LOCK_RELEASE(lock); continue; } export = class_export_lock_get(lock->l_export, lock); cfs_spin_unlock_bh(&waiting_locks_spinlock); do_dump++; class_fail_export(export); class_export_lock_put(export, lock); /* release extra ref grabbed by ldlm_add_waiting_lock() * or ldlm_failed_ast() */ LDLM_LOCK_RELEASE(lock); cfs_spin_lock_bh(&waiting_locks_spinlock); } cfs_spin_unlock_bh(&waiting_locks_spinlock); if (do_dump && obd_dump_on_eviction) { CERROR("dump the log upon eviction\n"); libcfs_debug_dumplog(); } if (expired_lock_thread.elt_state == ELT_TERMINATE) break; } expired_lock_thread.elt_state = ELT_STOPPED; cfs_waitq_signal(&expired_lock_thread.elt_waitq); RETURN(0); } static int ldlm_add_waiting_lock(struct ldlm_lock *lock); /** * Check if there is a request in the export request list * which prevents the lock canceling. */ static int ldlm_lock_busy(struct ldlm_lock *lock) { struct ptlrpc_request *req; int match = 0; ENTRY; if (lock->l_export == NULL) return 0; cfs_spin_lock_bh(&lock->l_export->exp_rpc_lock); cfs_list_for_each_entry(req, &lock->l_export->exp_queued_rpc, rq_exp_list) { if (req->rq_ops->hpreq_lock_match) { match = req->rq_ops->hpreq_lock_match(req, lock); if (match) break; } } cfs_spin_unlock_bh(&lock->l_export->exp_rpc_lock); RETURN(match); } /* This is called from within a timer interrupt and cannot schedule */ static void waiting_locks_callback(unsigned long unused) { struct ldlm_lock *lock, *last = NULL; repeat: cfs_spin_lock_bh(&waiting_locks_spinlock); while (!cfs_list_empty(&waiting_locks_list)) { lock = cfs_list_entry(waiting_locks_list.next, struct ldlm_lock, l_pending_chain); if (cfs_time_after(lock->l_callback_timeout, cfs_time_current()) || (lock->l_req_mode == LCK_GROUP)) break; if (ptlrpc_check_suspend()) { /* there is a case when we talk to one mds, holding * lock from another mds. this way we easily can get * here, if second mds is being recovered. so, we * suspend timeouts. bug 6019 */ LDLM_ERROR(lock, "recharge timeout: %s@%s nid %s ", lock->l_export->exp_client_uuid.uuid, lock->l_export->exp_connection->c_remote_uuid.uuid, libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid)); cfs_list_del_init(&lock->l_pending_chain); cfs_spin_unlock_bh(&waiting_locks_spinlock); ldlm_add_waiting_lock(lock); goto repeat; } /* if timeout overlaps the activation time of suspended timeouts * then extend it to give a chance for client to reconnect */ if (cfs_time_before(cfs_time_sub(lock->l_callback_timeout, cfs_time_seconds(obd_timeout)/2), ptlrpc_suspend_wakeup_time())) { LDLM_ERROR(lock, "extend timeout due to recovery: %s@%s nid %s ", lock->l_export->exp_client_uuid.uuid, lock->l_export->exp_connection->c_remote_uuid.uuid, libcfs_nid2str(lock->l_export->exp_connection->c_peer.nid)); cfs_list_del_init(&lock->l_pending_chain); cfs_spin_unlock_bh(&waiting_locks_spinlock); ldlm_add_waiting_lock(lock); goto repeat; } /* Check if we need to prolong timeout */ if (!OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT) && ldlm_lock_busy(lock)) { int cont = 1; if (lock->l_pending_chain.next == &waiting_locks_list) cont = 0; LDLM_LOCK_GET(lock); cfs_spin_unlock_bh(&waiting_locks_spinlock); LDLM_DEBUG(lock, "prolong the busy lock"); ldlm_refresh_waiting_lock(lock, ldlm_get_enq_timeout(lock)); cfs_spin_lock_bh(&waiting_locks_spinlock); if (!cont) { LDLM_LOCK_RELEASE(lock); break; } LDLM_LOCK_RELEASE(lock); continue; } ldlm_lock_to_ns(lock)->ns_timeouts++; LDLM_ERROR(lock, "lock callback timer expired after %lds: " "evicting client at %s ", cfs_time_current_sec()- lock->l_last_activity, libcfs_nid2str( lock->l_export->exp_connection->c_peer.nid)); last = lock; /* no needs to take an extra ref on the lock since it was in * the waiting_locks_list and ldlm_add_waiting_lock() * already grabbed a ref */ cfs_list_del(&lock->l_pending_chain); cfs_list_add(&lock->l_pending_chain, &expired_lock_thread.elt_expired_locks); } if (!cfs_list_empty(&expired_lock_thread.elt_expired_locks)) { if (obd_dump_on_timeout) expired_lock_thread.elt_dump = __LINE__; cfs_waitq_signal(&expired_lock_thread.elt_waitq); } /* * Make sure the timer will fire again if we have any locks * left. */ if (!cfs_list_empty(&waiting_locks_list)) { cfs_time_t timeout_rounded; lock = cfs_list_entry(waiting_locks_list.next, struct ldlm_lock, l_pending_chain); timeout_rounded = (cfs_time_t)round_timeout(lock->l_callback_timeout); cfs_timer_arm(&waiting_locks_timer, timeout_rounded); } cfs_spin_unlock_bh(&waiting_locks_spinlock); } /* * Indicate that we're waiting for a client to call us back cancelling a given * lock. We add it to the pending-callback chain, and schedule the lock-timeout * timer to fire appropriately. (We round up to the next second, to avoid * floods of timer firings during periods of high lock contention and traffic). * As done by ldlm_add_waiting_lock(), the caller must grab a lock reference * if it has been added to the waiting list (1 is returned). * * Called with the namespace lock held. */ static int __ldlm_add_waiting_lock(struct ldlm_lock *lock, int seconds) { cfs_time_t timeout; cfs_time_t timeout_rounded; if (!cfs_list_empty(&lock->l_pending_chain)) return 0; if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT) || OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT)) seconds = 1; timeout = cfs_time_shift(seconds); if (likely(cfs_time_after(timeout, lock->l_callback_timeout))) lock->l_callback_timeout = timeout; timeout_rounded = round_timeout(lock->l_callback_timeout); if (cfs_time_before(timeout_rounded, cfs_timer_deadline(&waiting_locks_timer)) || !cfs_timer_is_armed(&waiting_locks_timer)) { cfs_timer_arm(&waiting_locks_timer, timeout_rounded); } /* if the new lock has a shorter timeout than something earlier on the list, we'll wait the longer amount of time; no big deal. */ /* FIFO */ cfs_list_add_tail(&lock->l_pending_chain, &waiting_locks_list); return 1; } static int ldlm_add_waiting_lock(struct ldlm_lock *lock) { int ret; int timeout = ldlm_get_enq_timeout(lock); LASSERT(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)); cfs_spin_lock_bh(&waiting_locks_spinlock); if (lock->l_destroyed) { static cfs_time_t next; cfs_spin_unlock_bh(&waiting_locks_spinlock); LDLM_ERROR(lock, "not waiting on destroyed lock (bug 5653)"); if (cfs_time_after(cfs_time_current(), next)) { next = cfs_time_shift(14400); libcfs_debug_dumpstack(NULL); } return 0; } ret = __ldlm_add_waiting_lock(lock, timeout); if (ret) /* grab ref on the lock if it has been added to the * waiting list */ LDLM_LOCK_GET(lock); cfs_spin_unlock_bh(&waiting_locks_spinlock); LDLM_DEBUG(lock, "%sadding to wait list(timeout: %d, AT: %s)", ret == 0 ? "not re-" : "", timeout, AT_OFF ? "off" : "on"); return ret; } /* * Remove a lock from the pending list, likely because it had its cancellation * callback arrive without incident. This adjusts the lock-timeout timer if * needed. Returns 0 if the lock wasn't pending after all, 1 if it was. * As done by ldlm_del_waiting_lock(), the caller must release the lock * reference when the lock is removed from any list (1 is returned). * * Called with namespace lock held. */ static int __ldlm_del_waiting_lock(struct ldlm_lock *lock) { cfs_list_t *list_next; if (cfs_list_empty(&lock->l_pending_chain)) return 0; list_next = lock->l_pending_chain.next; if (lock->l_pending_chain.prev == &waiting_locks_list) { /* Removing the head of the list, adjust timer. */ if (list_next == &waiting_locks_list) { /* No more, just cancel. */ cfs_timer_disarm(&waiting_locks_timer); } else { struct ldlm_lock *next; next = cfs_list_entry(list_next, struct ldlm_lock, l_pending_chain); cfs_timer_arm(&waiting_locks_timer, round_timeout(next->l_callback_timeout)); } } cfs_list_del_init(&lock->l_pending_chain); return 1; } int ldlm_del_waiting_lock(struct ldlm_lock *lock) { int ret; if (lock->l_export == NULL) { /* We don't have a "waiting locks list" on clients. */ CDEBUG(D_DLMTRACE, "Client lock %p : no-op\n", lock); return 0; } cfs_spin_lock_bh(&waiting_locks_spinlock); ret = __ldlm_del_waiting_lock(lock); cfs_spin_unlock_bh(&waiting_locks_spinlock); if (ret) /* release lock ref if it has indeed been removed * from a list */ LDLM_LOCK_RELEASE(lock); LDLM_DEBUG(lock, "%s", ret == 0 ? "wasn't waiting" : "removed"); return ret; } /* * Prolong the lock * * Called with namespace lock held. */ int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout) { if (lock->l_export == NULL) { /* We don't have a "waiting locks list" on clients. */ LDLM_DEBUG(lock, "client lock: no-op"); return 0; } cfs_spin_lock_bh(&waiting_locks_spinlock); if (cfs_list_empty(&lock->l_pending_chain)) { cfs_spin_unlock_bh(&waiting_locks_spinlock); LDLM_DEBUG(lock, "wasn't waiting"); return 0; } /* we remove/add the lock to the waiting list, so no needs to * release/take a lock reference */ __ldlm_del_waiting_lock(lock); __ldlm_add_waiting_lock(lock, timeout); cfs_spin_unlock_bh(&waiting_locks_spinlock); LDLM_DEBUG(lock, "refreshed"); return 1; } #else /* !__KERNEL__ */ static int ldlm_add_waiting_lock(struct ldlm_lock *lock) { LASSERT(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)); RETURN(1); } int ldlm_del_waiting_lock(struct ldlm_lock *lock) { RETURN(0); } int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout) { RETURN(0); } #endif /* __KERNEL__ */ static void ldlm_failed_ast(struct ldlm_lock *lock, int rc, const char *ast_type) { LCONSOLE_ERROR_MSG(0x138, "%s: A client on nid %s was evicted due " "to a lock %s callback time out: rc %d\n", lock->l_export->exp_obd->obd_name, obd_export_nid2str(lock->l_export), ast_type, rc); if (obd_dump_on_timeout) libcfs_debug_dumplog(); #ifdef __KERNEL__ cfs_spin_lock_bh(&waiting_locks_spinlock); if (__ldlm_del_waiting_lock(lock) == 0) /* the lock was not in any list, grab an extra ref before adding * the lock to the expired list */ LDLM_LOCK_GET(lock); cfs_list_add(&lock->l_pending_chain, &expired_lock_thread.elt_expired_locks); cfs_waitq_signal(&expired_lock_thread.elt_waitq); cfs_spin_unlock_bh(&waiting_locks_spinlock); #else class_fail_export(lock->l_export); #endif } static int ldlm_handle_ast_error(struct ldlm_lock *lock, struct ptlrpc_request *req, int rc, const char *ast_type) { lnet_process_id_t peer = req->rq_import->imp_connection->c_peer; if (rc == -ETIMEDOUT || rc == -EINTR || rc == -ENOTCONN) { LASSERT(lock->l_export); if (lock->l_export->exp_libclient) { LDLM_DEBUG(lock, "%s AST to liblustre client (nid %s)" " timeout, just cancelling lock", ast_type, libcfs_nid2str(peer.nid)); ldlm_lock_cancel(lock); rc = -ERESTART; } else if (lock->l_flags & LDLM_FL_CANCEL) { LDLM_DEBUG(lock, "%s AST timeout from nid %s, but " "cancel was received (AST reply lost?)", ast_type, libcfs_nid2str(peer.nid)); ldlm_lock_cancel(lock); rc = -ERESTART; } else { ldlm_del_waiting_lock(lock); ldlm_failed_ast(lock, rc, ast_type); } } else if (rc) { if (rc == -EINVAL) { struct ldlm_resource *res = lock->l_resource; LDLM_DEBUG(lock, "client (nid %s) returned %d" " from %s AST - normal race", libcfs_nid2str(peer.nid), req->rq_repmsg ? lustre_msg_get_status(req->rq_repmsg) : -1, ast_type); if (res) { /* update lvbo to return proper attributes. * see bug 23174 */ ldlm_resource_getref(res); ldlm_res_lvbo_update(res, NULL, 1); ldlm_resource_putref(res); } } else { LDLM_ERROR(lock, "client (nid %s) returned %d " "from %s AST", libcfs_nid2str(peer.nid), (req->rq_repmsg != NULL) ? lustre_msg_get_status(req->rq_repmsg) : 0, ast_type); } ldlm_lock_cancel(lock); /* Server-side AST functions are called from ldlm_reprocess_all, * which needs to be told to please restart its reprocessing. */ rc = -ERESTART; } return rc; } static int ldlm_cb_interpret(const struct lu_env *env, struct ptlrpc_request *req, void *data, int rc) { struct ldlm_cb_async_args *ca = data; struct ldlm_lock *lock = ca->ca_lock; struct ldlm_cb_set_arg *arg = ca->ca_set_arg; struct ptlrpc_request_set *set = arg->set; ENTRY; LASSERT(lock != NULL); if (rc != 0) { rc = ldlm_handle_ast_error(lock, req, rc, arg->type == LDLM_BL_CALLBACK ? "blocking" : "completion"); if (rc == -ERESTART) cfs_atomic_inc(&arg->restart); } LDLM_LOCK_RELEASE(lock); cfs_waitq_signal(&set->set_waitq); RETURN(0); } static inline int ldlm_bl_and_cp_ast_tail(struct ptlrpc_request *req, struct ldlm_cb_set_arg *arg, struct ldlm_lock *lock, int instant_cancel) { int rc = 0; ENTRY; if (unlikely(instant_cancel)) { rc = ptl_send_rpc(req, 1); ptlrpc_req_finished(req); if (rc == 0) cfs_atomic_inc(&arg->restart); } else { LDLM_LOCK_GET(lock); ptlrpc_set_add_req(arg->set, req); ++arg->rpcs; } RETURN(rc); } /** * Check if there are requests in the export request list which prevent * the lock canceling and make these requests high priority ones. */ static void ldlm_lock_reorder_req(struct ldlm_lock *lock) { struct ptlrpc_request *req; ENTRY; if (lock->l_export == NULL) { LDLM_DEBUG(lock, "client lock: no-op"); RETURN_EXIT; } cfs_spin_lock_bh(&lock->l_export->exp_rpc_lock); cfs_list_for_each_entry(req, &lock->l_export->exp_queued_rpc, rq_exp_list) { if (!req->rq_hp && req->rq_ops->hpreq_lock_match && req->rq_ops->hpreq_lock_match(req, lock)) ptlrpc_hpreq_reorder(req); } cfs_spin_unlock_bh(&lock->l_export->exp_rpc_lock); EXIT; } /* * ->l_blocking_ast() method for server-side locks. This is invoked when newly * enqueued server lock conflicts with given one. * * Sends blocking ast rpc to the client owning that lock; arms timeout timer * to wait for client response. */ int ldlm_server_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc, void *data, int flag) { struct ldlm_cb_async_args *ca; struct ldlm_cb_set_arg *arg = data; struct ldlm_request *body; struct ptlrpc_request *req; int instant_cancel = 0; int rc = 0; ENTRY; if (flag == LDLM_CB_CANCELING) /* Don't need to do anything here. */ RETURN(0); LASSERT(lock); LASSERT(data != NULL); if (lock->l_export->exp_obd->obd_recovering != 0) { LDLM_ERROR(lock, "BUG 6063: lock collide during recovery"); ldlm_lock_dump(D_ERROR, lock, 0); } ldlm_lock_reorder_req(lock); req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse, &RQF_LDLM_BL_CALLBACK, LUSTRE_DLM_VERSION, LDLM_BL_CALLBACK); if (req == NULL) RETURN(-ENOMEM); CLASSERT(sizeof(*ca) <= sizeof(req->rq_async_args)); ca = ptlrpc_req_async_args(req); ca->ca_set_arg = arg; ca->ca_lock = lock; req->rq_interpret_reply = ldlm_cb_interpret; req->rq_no_resend = 1; lock_res(lock->l_resource); if (lock->l_granted_mode != lock->l_req_mode) { /* this blocking AST will be communicated as part of the * completion AST instead */ unlock_res(lock->l_resource); ptlrpc_req_finished(req); LDLM_DEBUG(lock, "lock not granted, not sending blocking AST"); RETURN(0); } if (lock->l_destroyed) { /* What's the point? */ unlock_res(lock->l_resource); ptlrpc_req_finished(req); RETURN(0); } if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) instant_cancel = 1; body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ); body->lock_handle[0] = lock->l_remote_handle; body->lock_desc = *desc; body->lock_flags |= (lock->l_flags & LDLM_AST_FLAGS); LDLM_DEBUG(lock, "server preparing blocking AST"); ptlrpc_request_set_replen(req); if (instant_cancel) { unlock_res(lock->l_resource); ldlm_lock_cancel(lock); } else { LASSERT(lock->l_granted_mode == lock->l_req_mode); ldlm_add_waiting_lock(lock); unlock_res(lock->l_resource); } req->rq_send_state = LUSTRE_IMP_FULL; /* ptlrpc_request_alloc_pack already set timeout */ if (AT_OFF) req->rq_timeout = ldlm_get_rq_timeout(); if (lock->l_export && lock->l_export->exp_nid_stats && lock->l_export->exp_nid_stats->nid_ldlm_stats) lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats, LDLM_BL_CALLBACK - LDLM_FIRST_OPC); rc = ldlm_bl_and_cp_ast_tail(req, arg, lock, instant_cancel); RETURN(rc); } int ldlm_server_completion_ast(struct ldlm_lock *lock, int flags, void *data) { struct ldlm_cb_set_arg *arg = data; struct ldlm_request *body; struct ptlrpc_request *req; struct ldlm_cb_async_args *ca; long total_enqueue_wait; int instant_cancel = 0; int rc = 0; ENTRY; LASSERT(lock != NULL); LASSERT(data != NULL); total_enqueue_wait = cfs_time_sub(cfs_time_current_sec(), lock->l_last_activity); req = ptlrpc_request_alloc(lock->l_export->exp_imp_reverse, &RQF_LDLM_CP_CALLBACK); if (req == NULL) RETURN(-ENOMEM); /* server namespace, doesn't need lock */ if (lock->l_resource->lr_lvb_len) { req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT, lock->l_resource->lr_lvb_len); } rc = ptlrpc_request_pack(req, LUSTRE_DLM_VERSION, LDLM_CP_CALLBACK); if (rc) { ptlrpc_request_free(req); RETURN(rc); } CLASSERT(sizeof(*ca) <= sizeof(req->rq_async_args)); ca = ptlrpc_req_async_args(req); ca->ca_set_arg = arg; ca->ca_lock = lock; req->rq_interpret_reply = ldlm_cb_interpret; req->rq_no_resend = 1; body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ); body->lock_handle[0] = lock->l_remote_handle; body->lock_flags = flags; ldlm_lock2desc(lock, &body->lock_desc); if (lock->l_resource->lr_lvb_len) { void *lvb = req_capsule_client_get(&req->rq_pill, &RMF_DLM_LVB); lock_res(lock->l_resource); memcpy(lvb, lock->l_resource->lr_lvb_data, lock->l_resource->lr_lvb_len); unlock_res(lock->l_resource); } LDLM_DEBUG(lock, "server preparing completion AST (after %lds wait)", total_enqueue_wait); /* Server-side enqueue wait time estimate, used in __ldlm_add_waiting_lock to set future enqueue timers */ if (total_enqueue_wait < ldlm_get_enq_timeout(lock)) at_measured(ldlm_lock_to_ns_at(lock), total_enqueue_wait); else /* bz18618. Don't add lock enqueue time we spend waiting for a previous callback to fail. Locks waiting legitimately will get extended by ldlm_refresh_waiting_lock regardless of the estimate, so it's okay to underestimate here. */ LDLM_DEBUG(lock, "lock completed after %lus; estimate was %ds. " "It is likely that a previous callback timed out.", total_enqueue_wait, at_get(ldlm_lock_to_ns_at(lock))); ptlrpc_request_set_replen(req); req->rq_send_state = LUSTRE_IMP_FULL; /* ptlrpc_request_pack already set timeout */ if (AT_OFF) req->rq_timeout = ldlm_get_rq_timeout(); /* We only send real blocking ASTs after the lock is granted */ lock_res_and_lock(lock); if (lock->l_flags & LDLM_FL_AST_SENT) { body->lock_flags |= LDLM_FL_AST_SENT; /* copy ast flags like LDLM_FL_DISCARD_DATA */ body->lock_flags |= (lock->l_flags & LDLM_AST_FLAGS); /* We might get here prior to ldlm_handle_enqueue setting * LDLM_FL_CANCEL_ON_BLOCK flag. Then we will put this lock * into waiting list, but this is safe and similar code in * ldlm_handle_enqueue will call ldlm_lock_cancel() still, * that would not only cancel the lock, but will also remove * it from waiting list */ if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) { unlock_res_and_lock(lock); ldlm_lock_cancel(lock); instant_cancel = 1; lock_res_and_lock(lock); } else { /* start the lock-timeout clock */ ldlm_add_waiting_lock(lock); } } unlock_res_and_lock(lock); if (lock->l_export && lock->l_export->exp_nid_stats && lock->l_export->exp_nid_stats->nid_ldlm_stats) lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats, LDLM_CP_CALLBACK - LDLM_FIRST_OPC); rc = ldlm_bl_and_cp_ast_tail(req, arg, lock, instant_cancel); RETURN(rc); } int ldlm_server_glimpse_ast(struct ldlm_lock *lock, void *data) { struct ldlm_resource *res = lock->l_resource; struct ldlm_request *body; struct ptlrpc_request *req; int rc; ENTRY; LASSERT(lock != NULL); req = ptlrpc_request_alloc_pack(lock->l_export->exp_imp_reverse, &RQF_LDLM_GL_CALLBACK, LUSTRE_DLM_VERSION, LDLM_GL_CALLBACK); if (req == NULL) RETURN(-ENOMEM); body = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ); body->lock_handle[0] = lock->l_remote_handle; ldlm_lock2desc(lock, &body->lock_desc); /* server namespace, doesn't need lock */ req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER, lock->l_resource->lr_lvb_len); res = lock->l_resource; ptlrpc_request_set_replen(req); req->rq_send_state = LUSTRE_IMP_FULL; /* ptlrpc_request_alloc_pack already set timeout */ if (AT_OFF) req->rq_timeout = ldlm_get_rq_timeout(); if (lock->l_export && lock->l_export->exp_nid_stats && lock->l_export->exp_nid_stats->nid_ldlm_stats) lprocfs_counter_incr(lock->l_export->exp_nid_stats->nid_ldlm_stats, LDLM_GL_CALLBACK - LDLM_FIRST_OPC); rc = ptlrpc_queue_wait(req); /* Update the LVB from disk if the AST failed (this is a legal race) * * - Glimpse callback of local lock just return -ELDLM_NO_LOCK_DATA. * - Glimpse callback of remote lock might return -ELDLM_NO_LOCK_DATA * when inode is cleared. LU-274 */ if (rc == -ELDLM_NO_LOCK_DATA) { LDLM_DEBUG(lock, "lost race - client has a lock but no inode"); ldlm_res_lvbo_update(res, NULL, 1); } else if (rc != 0) { rc = ldlm_handle_ast_error(lock, req, rc, "glimpse"); } else { rc = ldlm_res_lvbo_update(res, req, 1); } ptlrpc_req_finished(req); if (rc == -ERESTART) ldlm_reprocess_all(res); RETURN(rc); } #ifdef __KERNEL__ extern unsigned long long lu_time_stamp_get(void); #else #define lu_time_stamp_get() time(NULL) #endif static void ldlm_svc_get_eopc(const struct ldlm_request *dlm_req, struct lprocfs_stats *srv_stats) { int lock_type = 0, op = 0; lock_type = dlm_req->lock_desc.l_resource.lr_type; switch (lock_type) { case LDLM_PLAIN: op = PTLRPC_LAST_CNTR + LDLM_PLAIN_ENQUEUE; break; case LDLM_EXTENT: if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT) op = PTLRPC_LAST_CNTR + LDLM_GLIMPSE_ENQUEUE; else op = PTLRPC_LAST_CNTR + LDLM_EXTENT_ENQUEUE; break; case LDLM_FLOCK: op = PTLRPC_LAST_CNTR + LDLM_FLOCK_ENQUEUE; break; case LDLM_IBITS: op = PTLRPC_LAST_CNTR + LDLM_IBITS_ENQUEUE; break; default: op = 0; break; } if (op) lprocfs_counter_incr(srv_stats, op); return; } /* * Main server-side entry point into LDLM. This is called by ptlrpc service * threads to carry out client lock enqueueing requests. */ int ldlm_handle_enqueue0(struct ldlm_namespace *ns, struct ptlrpc_request *req, const struct ldlm_request *dlm_req, const struct ldlm_callback_suite *cbs) { struct ldlm_reply *dlm_rep; __u32 flags; ldlm_error_t err = ELDLM_OK; struct ldlm_lock *lock = NULL; void *cookie = NULL; int rc = 0; ENTRY; LDLM_DEBUG_NOLOCK("server-side enqueue handler START"); ldlm_request_cancel(req, dlm_req, LDLM_ENQUEUE_CANCEL_OFF); flags = dlm_req->lock_flags; LASSERT(req->rq_export); if (req->rq_rqbd->rqbd_service->srv_stats) ldlm_svc_get_eopc(dlm_req, req->rq_rqbd->rqbd_service->srv_stats); if (req->rq_export && req->rq_export->exp_nid_stats && req->rq_export->exp_nid_stats->nid_ldlm_stats) lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats, LDLM_ENQUEUE - LDLM_FIRST_OPC); if (unlikely(dlm_req->lock_desc.l_resource.lr_type < LDLM_MIN_TYPE || dlm_req->lock_desc.l_resource.lr_type >= LDLM_MAX_TYPE)) { DEBUG_REQ(D_ERROR, req, "invalid lock request type %d", dlm_req->lock_desc.l_resource.lr_type); GOTO(out, rc = -EFAULT); } if (unlikely(dlm_req->lock_desc.l_req_mode <= LCK_MINMODE || dlm_req->lock_desc.l_req_mode >= LCK_MAXMODE || dlm_req->lock_desc.l_req_mode & (dlm_req->lock_desc.l_req_mode-1))) { DEBUG_REQ(D_ERROR, req, "invalid lock request mode %d", dlm_req->lock_desc.l_req_mode); GOTO(out, rc = -EFAULT); } if (req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) { if (unlikely(dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN)) { DEBUG_REQ(D_ERROR, req, "PLAIN lock request from IBITS client?"); GOTO(out, rc = -EPROTO); } } else if (unlikely(dlm_req->lock_desc.l_resource.lr_type == LDLM_IBITS)) { DEBUG_REQ(D_ERROR, req, "IBITS lock request from unaware client?"); GOTO(out, rc = -EPROTO); } #if 0 /* FIXME this makes it impossible to use LDLM_PLAIN locks -- check against server's _CONNECT_SUPPORTED flags? (I don't want to use ibits for mgc/mgs) */ /* INODEBITS_INTEROP: Perform conversion from plain lock to * inodebits lock if client does not support them. */ if (!(req->rq_export->exp_connect_flags & OBD_CONNECT_IBITS) && (dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN)) { dlm_req->lock_desc.l_resource.lr_type = LDLM_IBITS; dlm_req->lock_desc.l_policy_data.l_inodebits.bits = MDS_INODELOCK_LOOKUP | MDS_INODELOCK_UPDATE; if (dlm_req->lock_desc.l_req_mode == LCK_PR) dlm_req->lock_desc.l_req_mode = LCK_CR; } #endif if (unlikely(flags & LDLM_FL_REPLAY)) { /* Find an existing lock in the per-export lock hash */ lock = cfs_hash_lookup(req->rq_export->exp_lock_hash, (void *)&dlm_req->lock_handle[0]); if (lock != NULL) { DEBUG_REQ(D_DLMTRACE, req, "found existing lock cookie " LPX64, lock->l_handle.h_cookie); GOTO(existing_lock, rc = 0); } } /* The lock's callback data might be set in the policy function */ lock = ldlm_lock_create(ns, &dlm_req->lock_desc.l_resource.lr_name, dlm_req->lock_desc.l_resource.lr_type, dlm_req->lock_desc.l_req_mode, cbs, NULL, 0); if (!lock) GOTO(out, rc = -ENOMEM); lock->l_last_activity = cfs_time_current_sec(); lock->l_remote_handle = dlm_req->lock_handle[0]; LDLM_DEBUG(lock, "server-side enqueue handler, new lock created"); OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_BLOCKED, obd_timeout * 2); /* Don't enqueue a lock onto the export if it is been disonnected * due to eviction (bug 3822) or server umount (bug 24324). * Cancel it now instead. */ if (req->rq_export->exp_disconnected) { LDLM_ERROR(lock, "lock on disconnected export %p", req->rq_export); GOTO(out, rc = -ENOTCONN); } lock->l_export = class_export_lock_get(req->rq_export, lock); if (lock->l_export->exp_lock_hash) cfs_hash_add(lock->l_export->exp_lock_hash, &lock->l_remote_handle, &lock->l_exp_hash); existing_lock: if (flags & LDLM_FL_HAS_INTENT) { /* In this case, the reply buffer is allocated deep in * local_lock_enqueue by the policy function. */ cookie = req; } else { /* based on the assumption that lvb size never changes during * resource life time otherwise it need resource->lr_lock's * protection */ if (lock->l_resource->lr_lvb_len) { req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER, lock->l_resource->lr_lvb_len); } if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR)) GOTO(out, rc = -ENOMEM); rc = req_capsule_server_pack(&req->rq_pill); if (rc) GOTO(out, rc); } if (dlm_req->lock_desc.l_resource.lr_type != LDLM_PLAIN) ldlm_convert_policy_to_local( dlm_req->lock_desc.l_resource.lr_type, &dlm_req->lock_desc.l_policy_data, &lock->l_policy_data); if (dlm_req->lock_desc.l_resource.lr_type == LDLM_EXTENT) lock->l_req_extent = lock->l_policy_data.l_extent; err = ldlm_lock_enqueue(ns, &lock, cookie, (int *)&flags); if (err) GOTO(out, err); dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP); dlm_rep->lock_flags = flags; ldlm_lock2desc(lock, &dlm_rep->lock_desc); ldlm_lock2handle(lock, &dlm_rep->lock_handle); /* We never send a blocking AST until the lock is granted, but * we can tell it right now */ lock_res_and_lock(lock); /* Now take into account flags to be inherited from original lock request both in reply to client and in our own lock flags. */ dlm_rep->lock_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS; lock->l_flags |= dlm_req->lock_flags & LDLM_INHERIT_FLAGS; /* Don't move a pending lock onto the export if it has already been * disconnected due to eviction (bug 5683) or server umount (bug 24324). * Cancel it now instead. */ if (unlikely(req->rq_export->exp_disconnected || OBD_FAIL_CHECK(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT))) { LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export); rc = -ENOTCONN; } else if (lock->l_flags & LDLM_FL_AST_SENT) { dlm_rep->lock_flags |= LDLM_FL_AST_SENT; if (lock->l_granted_mode == lock->l_req_mode) { /* * Only cancel lock if it was granted, because it would * be destroyed immediately and would never be granted * in the future, causing timeouts on client. Not * granted lock will be cancelled immediately after * sending completion AST. */ if (dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK) { unlock_res_and_lock(lock); ldlm_lock_cancel(lock); lock_res_and_lock(lock); } else ldlm_add_waiting_lock(lock); } } /* Make sure we never ever grant usual metadata locks to liblustre clients */ if ((dlm_req->lock_desc.l_resource.lr_type == LDLM_PLAIN || dlm_req->lock_desc.l_resource.lr_type == LDLM_IBITS) && req->rq_export->exp_libclient) { if (unlikely(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) || !(dlm_rep->lock_flags & LDLM_FL_CANCEL_ON_BLOCK))){ CERROR("Granting sync lock to libclient. " "req fl %d, rep fl %d, lock fl "LPX64"\n", dlm_req->lock_flags, dlm_rep->lock_flags, lock->l_flags); LDLM_ERROR(lock, "sync lock"); if (dlm_req->lock_flags & LDLM_FL_HAS_INTENT) { struct ldlm_intent *it; it = req_capsule_client_get(&req->rq_pill, &RMF_LDLM_INTENT); if (it != NULL) { CERROR("This is intent %s ("LPU64")\n", ldlm_it2str(it->opc), it->opc); } } } } unlock_res_and_lock(lock); EXIT; out: req->rq_status = rc ?: err; /* return either error - bug 11190 */ if (!req->rq_packed_final) { err = lustre_pack_reply(req, 1, NULL, NULL); if (rc == 0) rc = err; } /* The LOCK_CHANGED code in ldlm_lock_enqueue depends on this * ldlm_reprocess_all. If this moves, revisit that code. -phil */ if (lock) { LDLM_DEBUG(lock, "server-side enqueue handler, sending reply" "(err=%d, rc=%d)", err, rc); if (rc == 0) { if (lock->l_resource->lr_lvb_len > 0) { /* MDT path won't handle lr_lvb_data, so * lock/unlock better be contained in the * if block */ void *lvb; lvb = req_capsule_server_get(&req->rq_pill, &RMF_DLM_LVB); LASSERTF(lvb != NULL, "req %p, lock %p\n", req, lock); lock_res(lock->l_resource); memcpy(lvb, lock->l_resource->lr_lvb_data, lock->l_resource->lr_lvb_len); unlock_res(lock->l_resource); } } else { lock_res_and_lock(lock); ldlm_resource_unlink_lock(lock); ldlm_lock_destroy_nolock(lock); unlock_res_and_lock(lock); } if (!err && dlm_req->lock_desc.l_resource.lr_type != LDLM_FLOCK) ldlm_reprocess_all(lock->l_resource); LDLM_LOCK_RELEASE(lock); } LDLM_DEBUG_NOLOCK("server-side enqueue handler END (lock %p, rc %d)", lock, rc); return rc; } int ldlm_handle_enqueue(struct ptlrpc_request *req, ldlm_completion_callback completion_callback, ldlm_blocking_callback blocking_callback, ldlm_glimpse_callback glimpse_callback) { struct ldlm_request *dlm_req; struct ldlm_callback_suite cbs = { .lcs_completion = completion_callback, .lcs_blocking = blocking_callback, .lcs_glimpse = glimpse_callback }; int rc; dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ); if (dlm_req != NULL) { rc = ldlm_handle_enqueue0(req->rq_export->exp_obd->obd_namespace, req, dlm_req, &cbs); } else { rc = -EFAULT; } return rc; } int ldlm_handle_convert0(struct ptlrpc_request *req, const struct ldlm_request *dlm_req) { struct ldlm_reply *dlm_rep; struct ldlm_lock *lock; int rc; ENTRY; if (req->rq_export && req->rq_export->exp_nid_stats && req->rq_export->exp_nid_stats->nid_ldlm_stats) lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats, LDLM_CONVERT - LDLM_FIRST_OPC); rc = req_capsule_server_pack(&req->rq_pill); if (rc) RETURN(rc); dlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP); dlm_rep->lock_flags = dlm_req->lock_flags; lock = ldlm_handle2lock(&dlm_req->lock_handle[0]); if (!lock) { req->rq_status = EINVAL; } else { void *res = NULL; LDLM_DEBUG(lock, "server-side convert handler START"); lock->l_last_activity = cfs_time_current_sec(); res = ldlm_lock_convert(lock, dlm_req->lock_desc.l_req_mode, &dlm_rep->lock_flags); if (res) { if (ldlm_del_waiting_lock(lock)) LDLM_DEBUG(lock, "converted waiting lock"); req->rq_status = 0; } else { req->rq_status = EDEADLOCK; } } if (lock) { if (!req->rq_status) ldlm_reprocess_all(lock->l_resource); LDLM_DEBUG(lock, "server-side convert handler END"); LDLM_LOCK_PUT(lock); } else LDLM_DEBUG_NOLOCK("server-side convert handler END"); RETURN(0); } int ldlm_handle_convert(struct ptlrpc_request *req) { int rc; struct ldlm_request *dlm_req; dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ); if (dlm_req != NULL) { rc = ldlm_handle_convert0(req, dlm_req); } else { CERROR ("Can't unpack dlm_req\n"); rc = -EFAULT; } return rc; } /* Cancel all the locks whos handles are packed into ldlm_request */ int ldlm_request_cancel(struct ptlrpc_request *req, const struct ldlm_request *dlm_req, int first) { struct ldlm_resource *res, *pres = NULL; struct ldlm_lock *lock; int i, count, done = 0; ENTRY; count = dlm_req->lock_count ? dlm_req->lock_count : 1; if (first >= count) RETURN(0); /* There is no lock on the server at the replay time, * skip lock cancelling to make replay tests to pass. */ if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) RETURN(0); LDLM_DEBUG_NOLOCK("server-side cancel handler START: %d locks, " "starting at %d", count, first); for (i = first; i < count; i++) { lock = ldlm_handle2lock(&dlm_req->lock_handle[i]); if (!lock) { LDLM_DEBUG_NOLOCK("server-side cancel handler stale " "lock (cookie "LPU64")", dlm_req->lock_handle[i].cookie); continue; } res = lock->l_resource; done++; if (res != pres) { if (pres != NULL) { ldlm_reprocess_all(pres); LDLM_RESOURCE_DELREF(pres); ldlm_resource_putref(pres); } if (res != NULL) { ldlm_resource_getref(res); LDLM_RESOURCE_ADDREF(res); ldlm_res_lvbo_update(res, NULL, 1); } pres = res; } ldlm_lock_cancel(lock); LDLM_LOCK_PUT(lock); } if (pres != NULL) { ldlm_reprocess_all(pres); LDLM_RESOURCE_DELREF(pres); ldlm_resource_putref(pres); } LDLM_DEBUG_NOLOCK("server-side cancel handler END"); RETURN(done); } int ldlm_handle_cancel(struct ptlrpc_request *req) { struct ldlm_request *dlm_req; int rc; ENTRY; dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ); if (dlm_req == NULL) { CDEBUG(D_INFO, "bad request buffer for cancel\n"); RETURN(-EFAULT); } if (req->rq_export && req->rq_export->exp_nid_stats && req->rq_export->exp_nid_stats->nid_ldlm_stats) lprocfs_counter_incr(req->rq_export->exp_nid_stats->nid_ldlm_stats, LDLM_CANCEL - LDLM_FIRST_OPC); rc = req_capsule_server_pack(&req->rq_pill); if (rc) RETURN(rc); if (!ldlm_request_cancel(req, dlm_req, 0)) req->rq_status = ESTALE; RETURN(ptlrpc_reply(req)); } void ldlm_handle_bl_callback(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld, struct ldlm_lock *lock) { int do_ast; ENTRY; LDLM_DEBUG(lock, "client blocking AST callback handler"); lock_res_and_lock(lock); lock->l_flags |= LDLM_FL_CBPENDING; if (lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK) lock->l_flags |= LDLM_FL_CANCEL; do_ast = (!lock->l_readers && !lock->l_writers); unlock_res_and_lock(lock); if (do_ast) { CDEBUG(D_DLMTRACE, "Lock %p already unused, calling callback (%p)\n", lock, lock->l_blocking_ast); if (lock->l_blocking_ast != NULL) lock->l_blocking_ast(lock, ld, lock->l_ast_data, LDLM_CB_BLOCKING); } else { CDEBUG(D_DLMTRACE, "Lock %p is referenced, will be cancelled later\n", lock); } LDLM_DEBUG(lock, "client blocking callback handler END"); LDLM_LOCK_RELEASE(lock); EXIT; } static void ldlm_handle_cp_callback(struct ptlrpc_request *req, struct ldlm_namespace *ns, struct ldlm_request *dlm_req, struct ldlm_lock *lock) { CFS_LIST_HEAD(ast_list); ENTRY; LDLM_DEBUG(lock, "client completion callback handler START"); if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE)) { int to = cfs_time_seconds(1); while (to > 0) { cfs_schedule_timeout_and_set_state( CFS_TASK_INTERRUPTIBLE, to); if (lock->l_granted_mode == lock->l_req_mode || lock->l_destroyed) break; } } lock_res_and_lock(lock); if (lock->l_destroyed || lock->l_granted_mode == lock->l_req_mode) { /* bug 11300: the lock has already been granted */ unlock_res_and_lock(lock); LDLM_DEBUG(lock, "Double grant race happened"); LDLM_LOCK_RELEASE(lock); EXIT; return; } /* If we receive the completion AST before the actual enqueue returned, * then we might need to switch lock modes, resources, or extents. */ if (dlm_req->lock_desc.l_granted_mode != lock->l_req_mode) { lock->l_req_mode = dlm_req->lock_desc.l_granted_mode; LDLM_DEBUG(lock, "completion AST, new lock mode"); } if (lock->l_resource->lr_type != LDLM_PLAIN) { ldlm_convert_policy_to_local( dlm_req->lock_desc.l_resource.lr_type, &dlm_req->lock_desc.l_policy_data, &lock->l_policy_data); LDLM_DEBUG(lock, "completion AST, new policy data"); } ldlm_resource_unlink_lock(lock); if (memcmp(&dlm_req->lock_desc.l_resource.lr_name, &lock->l_resource->lr_name, sizeof(lock->l_resource->lr_name)) != 0) { unlock_res_and_lock(lock); if (ldlm_lock_change_resource(ns, lock, &dlm_req->lock_desc.l_resource.lr_name) != 0) { LDLM_ERROR(lock, "Failed to allocate resource"); LDLM_LOCK_RELEASE(lock); EXIT; return; } LDLM_DEBUG(lock, "completion AST, new resource"); CERROR("change resource!\n"); lock_res_and_lock(lock); } if (dlm_req->lock_flags & LDLM_FL_AST_SENT) { /* BL_AST locks are not needed in lru. * let ldlm_cancel_lru() be fast. */ ldlm_lock_remove_from_lru(lock); lock->l_flags |= LDLM_FL_CBPENDING | LDLM_FL_BL_AST; LDLM_DEBUG(lock, "completion AST includes blocking AST"); } if (lock->l_lvb_len) { if (req_capsule_get_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT) < lock->l_lvb_len) { LDLM_ERROR(lock, "completion AST did not contain " "expected LVB!"); } else { void *lvb = req_capsule_client_get(&req->rq_pill, &RMF_DLM_LVB); memcpy(lock->l_lvb_data, lvb, lock->l_lvb_len); } } ldlm_grant_lock(lock, &ast_list); unlock_res_and_lock(lock); LDLM_DEBUG(lock, "callback handler finished, about to run_ast_work"); /* Let Enqueue to call osc_lock_upcall() and initialize * l_ast_data */ OBD_FAIL_TIMEOUT(OBD_FAIL_OSC_CP_ENQ_RACE, 2); ldlm_run_ast_work(ns, &ast_list, LDLM_WORK_CP_AST); LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)", lock); LDLM_LOCK_RELEASE(lock); EXIT; } static void ldlm_handle_gl_callback(struct ptlrpc_request *req, struct ldlm_namespace *ns, struct ldlm_request *dlm_req, struct ldlm_lock *lock) { int rc = -ENOSYS; ENTRY; LDLM_DEBUG(lock, "client glimpse AST callback handler"); if (lock->l_glimpse_ast != NULL) rc = lock->l_glimpse_ast(lock, req); if (req->rq_repmsg != NULL) { ptlrpc_reply(req); } else { req->rq_status = rc; ptlrpc_error(req); } lock_res_and_lock(lock); if (lock->l_granted_mode == LCK_PW && !lock->l_readers && !lock->l_writers && cfs_time_after(cfs_time_current(), cfs_time_add(lock->l_last_used, cfs_time_seconds(10)))) { unlock_res_and_lock(lock); if (ldlm_bl_to_thread_lock(ns, NULL, lock)) ldlm_handle_bl_callback(ns, NULL, lock); EXIT; return; } unlock_res_and_lock(lock); LDLM_LOCK_RELEASE(lock); EXIT; } static int ldlm_callback_reply(struct ptlrpc_request *req, int rc) { if (req->rq_no_reply) return 0; req->rq_status = rc; if (!req->rq_packed_final) { rc = lustre_pack_reply(req, 1, NULL, NULL); if (rc) return rc; } return ptlrpc_reply(req); } #ifdef __KERNEL__ static int __ldlm_bl_to_thread(struct ldlm_bl_work_item *blwi, int mode) { struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool; ENTRY; cfs_spin_lock(&blp->blp_lock); if (blwi->blwi_lock && blwi->blwi_lock->l_flags & LDLM_FL_DISCARD_DATA) { /* add LDLM_FL_DISCARD_DATA requests to the priority list */ cfs_list_add_tail(&blwi->blwi_entry, &blp->blp_prio_list); } else { /* other blocking callbacks are added to the regular list */ cfs_list_add_tail(&blwi->blwi_entry, &blp->blp_list); } cfs_spin_unlock(&blp->blp_lock); cfs_waitq_signal(&blp->blp_waitq); /* can not use blwi->blwi_mode as blwi could be already freed in LDLM_ASYNC mode */ if (mode == LDLM_SYNC) cfs_wait_for_completion(&blwi->blwi_comp); RETURN(0); } static inline void init_blwi(struct ldlm_bl_work_item *blwi, struct ldlm_namespace *ns, struct ldlm_lock_desc *ld, cfs_list_t *cancels, int count, struct ldlm_lock *lock, int mode) { cfs_init_completion(&blwi->blwi_comp); CFS_INIT_LIST_HEAD(&blwi->blwi_head); if (cfs_memory_pressure_get()) blwi->blwi_mem_pressure = 1; blwi->blwi_ns = ns; blwi->blwi_mode = mode; if (ld != NULL) blwi->blwi_ld = *ld; if (count) { cfs_list_add(&blwi->blwi_head, cancels); cfs_list_del_init(cancels); blwi->blwi_count = count; } else { blwi->blwi_lock = lock; } } static int ldlm_bl_to_thread(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld, struct ldlm_lock *lock, cfs_list_t *cancels, int count, int mode) { ENTRY; if (cancels && count == 0) RETURN(0); if (mode == LDLM_SYNC) { /* if it is synchronous call do minimum mem alloc, as it could * be triggered from kernel shrinker */ struct ldlm_bl_work_item blwi; memset(&blwi, 0, sizeof(blwi)); init_blwi(&blwi, ns, ld, cancels, count, lock, LDLM_SYNC); RETURN(__ldlm_bl_to_thread(&blwi, LDLM_SYNC)); } else { struct ldlm_bl_work_item *blwi; OBD_ALLOC(blwi, sizeof(*blwi)); if (blwi == NULL) RETURN(-ENOMEM); init_blwi(blwi, ns, ld, cancels, count, lock, LDLM_ASYNC); RETURN(__ldlm_bl_to_thread(blwi, LDLM_ASYNC)); } } #endif int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld, struct ldlm_lock *lock) { #ifdef __KERNEL__ RETURN(ldlm_bl_to_thread(ns, ld, lock, NULL, 0, LDLM_ASYNC)); #else RETURN(-ENOSYS); #endif } int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld, cfs_list_t *cancels, int count, int mode) { #ifdef __KERNEL__ RETURN(ldlm_bl_to_thread(ns, ld, NULL, cancels, count, mode)); #else RETURN(-ENOSYS); #endif } /* Setinfo coming from Server (eg MDT) to Client (eg MDC)! */ static int ldlm_handle_setinfo(struct ptlrpc_request *req) { struct obd_device *obd = req->rq_export->exp_obd; char *key; void *val; int keylen, vallen; int rc = -ENOSYS; ENTRY; DEBUG_REQ(D_HSM, req, "%s: handle setinfo\n", obd->obd_name); req_capsule_set(&req->rq_pill, &RQF_OBD_SET_INFO); key = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY); if (key == NULL) { DEBUG_REQ(D_IOCTL, req, "no set_info key"); RETURN(-EFAULT); } keylen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_KEY, RCL_CLIENT); val = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL); if (val == NULL) { DEBUG_REQ(D_IOCTL, req, "no set_info val"); RETURN(-EFAULT); } vallen = req_capsule_get_size(&req->rq_pill, &RMF_SETINFO_VAL, RCL_CLIENT); /* We are responsible for swabbing contents of val */ if (KEY_IS(KEY_HSM_COPYTOOL_SEND)) /* Pass it on to mdc (the "export" in this case) */ rc = obd_set_info_async(req->rq_export, sizeof(KEY_HSM_COPYTOOL_SEND), KEY_HSM_COPYTOOL_SEND, vallen, val, NULL); else DEBUG_REQ(D_WARNING, req, "ignoring unknown key %s", key); return rc; } static inline void ldlm_callback_errmsg(struct ptlrpc_request *req, const char *msg, int rc, struct lustre_handle *handle) { DEBUG_REQ((req->rq_no_reply || rc) ? D_WARNING : D_DLMTRACE, req, "%s: [nid %s] [rc %d] [lock "LPX64"]", msg, libcfs_id2str(req->rq_peer), rc, handle ? handle->cookie : 0); if (req->rq_no_reply) CWARN("No reply was sent, maybe cause bug 21636.\n"); else if (rc) CWARN("Send reply failed, maybe cause bug 21636.\n"); } /* TODO: handle requests in a similar way as MDT: see mdt_handle_common() */ static int ldlm_callback_handler(struct ptlrpc_request *req) { struct ldlm_namespace *ns; struct ldlm_request *dlm_req; struct ldlm_lock *lock; int rc; ENTRY; /* Requests arrive in sender's byte order. The ptlrpc service * handler has already checked and, if necessary, byte-swapped the * incoming request message body, but I am responsible for the * message buffers. */ /* do nothing for sec context finalize */ if (lustre_msg_get_opc(req->rq_reqmsg) == SEC_CTX_FINI) RETURN(0); req_capsule_init(&req->rq_pill, req, RCL_SERVER); if (req->rq_export == NULL) { rc = ldlm_callback_reply(req, -ENOTCONN); ldlm_callback_errmsg(req, "Operate on unconnected server", rc, NULL); RETURN(0); } LASSERT(req->rq_export != NULL); LASSERT(req->rq_export->exp_obd != NULL); switch (lustre_msg_get_opc(req->rq_reqmsg)) { case LDLM_BL_CALLBACK: if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_BL_CALLBACK)) RETURN(0); break; case LDLM_CP_CALLBACK: if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CP_CALLBACK)) RETURN(0); break; case LDLM_GL_CALLBACK: if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_GL_CALLBACK)) RETURN(0); break; case LDLM_SET_INFO: rc = ldlm_handle_setinfo(req); ldlm_callback_reply(req, rc); RETURN(0); case OBD_LOG_CANCEL: /* remove this eventually - for 1.4.0 compat */ CERROR("shouldn't be handling OBD_LOG_CANCEL on DLM thread\n"); req_capsule_set(&req->rq_pill, &RQF_LOG_CANCEL); if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_NET)) RETURN(0); rc = llog_origin_handle_cancel(req); if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_REP)) RETURN(0); ldlm_callback_reply(req, rc); RETURN(0); case OBD_QC_CALLBACK: req_capsule_set(&req->rq_pill, &RQF_QC_CALLBACK); if (OBD_FAIL_CHECK(OBD_FAIL_OBD_QC_CALLBACK_NET)) RETURN(0); rc = target_handle_qc_callback(req); ldlm_callback_reply(req, rc); RETURN(0); case QUOTA_DQACQ: case QUOTA_DQREL: /* reply in handler */ req_capsule_set(&req->rq_pill, &RQF_MDS_QUOTA_DQACQ); rc = target_handle_dqacq_callback(req); RETURN(0); case LLOG_ORIGIN_HANDLE_CREATE: req_capsule_set(&req->rq_pill, &RQF_LLOG_ORIGIN_HANDLE_CREATE); if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET)) RETURN(0); rc = llog_origin_handle_create(req); ldlm_callback_reply(req, rc); RETURN(0); case LLOG_ORIGIN_HANDLE_NEXT_BLOCK: req_capsule_set(&req->rq_pill, &RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK); if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET)) RETURN(0); rc = llog_origin_handle_next_block(req); ldlm_callback_reply(req, rc); RETURN(0); case LLOG_ORIGIN_HANDLE_READ_HEADER: req_capsule_set(&req->rq_pill, &RQF_LLOG_ORIGIN_HANDLE_READ_HEADER); if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET)) RETURN(0); rc = llog_origin_handle_read_header(req); ldlm_callback_reply(req, rc); RETURN(0); case LLOG_ORIGIN_HANDLE_CLOSE: if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOGD_NET)) RETURN(0); rc = llog_origin_handle_close(req); ldlm_callback_reply(req, rc); RETURN(0); default: CERROR("unknown opcode %u\n", lustre_msg_get_opc(req->rq_reqmsg)); ldlm_callback_reply(req, -EPROTO); RETURN(0); } ns = req->rq_export->exp_obd->obd_namespace; LASSERT(ns != NULL); req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK); dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ); if (dlm_req == NULL) { rc = ldlm_callback_reply(req, -EPROTO); ldlm_callback_errmsg(req, "Operate without parameter", rc, NULL); RETURN(0); } /* Force a known safe race, send a cancel to the server for a lock * which the server has already started a blocking callback on. */ if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL_BL_CB_RACE) && lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) { rc = ldlm_cli_cancel(&dlm_req->lock_handle[0]); if (rc < 0) CERROR("ldlm_cli_cancel: %d\n", rc); } lock = ldlm_handle2lock_long(&dlm_req->lock_handle[0], 0); if (!lock) { CDEBUG(D_DLMTRACE, "callback on lock "LPX64" - lock " "disappeared\n", dlm_req->lock_handle[0].cookie); rc = ldlm_callback_reply(req, -EINVAL); ldlm_callback_errmsg(req, "Operate with invalid parameter", rc, &dlm_req->lock_handle[0]); RETURN(0); } if ((lock->l_flags & LDLM_FL_FAIL_LOC) && lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) OBD_RACE(OBD_FAIL_LDLM_CP_BL_RACE); /* Copy hints/flags (e.g. LDLM_FL_DISCARD_DATA) from AST. */ lock_res_and_lock(lock); lock->l_flags |= (dlm_req->lock_flags & LDLM_AST_FLAGS); if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_BL_CALLBACK) { /* If somebody cancels lock and cache is already dropped, * or lock is failed before cp_ast received on client, * we can tell the server we have no lock. Otherwise, we * should send cancel after dropping the cache. */ if (((lock->l_flags & LDLM_FL_CANCELING) && (lock->l_flags & LDLM_FL_BL_DONE)) || (lock->l_flags & LDLM_FL_FAILED)) { LDLM_DEBUG(lock, "callback on lock " LPX64" - lock disappeared\n", dlm_req->lock_handle[0].cookie); unlock_res_and_lock(lock); LDLM_LOCK_RELEASE(lock); rc = ldlm_callback_reply(req, -EINVAL); ldlm_callback_errmsg(req, "Operate on stale lock", rc, &dlm_req->lock_handle[0]); RETURN(0); } /* BL_AST locks are not needed in lru. * let ldlm_cancel_lru() be fast. */ ldlm_lock_remove_from_lru(lock); lock->l_flags |= LDLM_FL_BL_AST; } unlock_res_and_lock(lock); /* We want the ost thread to get this reply so that it can respond * to ost requests (write cache writeback) that might be triggered * in the callback. * * But we'd also like to be able to indicate in the reply that we're * cancelling right now, because it's unused, or have an intent result * in the reply, so we might have to push the responsibility for sending * the reply down into the AST handlers, alas. */ switch (lustre_msg_get_opc(req->rq_reqmsg)) { case LDLM_BL_CALLBACK: CDEBUG(D_INODE, "blocking ast\n"); req_capsule_extend(&req->rq_pill, &RQF_LDLM_BL_CALLBACK); if (!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)) { rc = ldlm_callback_reply(req, 0); if (req->rq_no_reply || rc) ldlm_callback_errmsg(req, "Normal process", rc, &dlm_req->lock_handle[0]); } if (ldlm_bl_to_thread_lock(ns, &dlm_req->lock_desc, lock)) ldlm_handle_bl_callback(ns, &dlm_req->lock_desc, lock); break; case LDLM_CP_CALLBACK: CDEBUG(D_INODE, "completion ast\n"); req_capsule_extend(&req->rq_pill, &RQF_LDLM_CP_CALLBACK); ldlm_callback_reply(req, 0); ldlm_handle_cp_callback(req, ns, dlm_req, lock); break; case LDLM_GL_CALLBACK: CDEBUG(D_INODE, "glimpse ast\n"); req_capsule_extend(&req->rq_pill, &RQF_LDLM_GL_CALLBACK); ldlm_handle_gl_callback(req, ns, dlm_req, lock); break; default: LBUG(); /* checked above */ } RETURN(0); } static int ldlm_cancel_handler(struct ptlrpc_request *req) { int rc; ENTRY; /* Requests arrive in sender's byte order. The ptlrpc service * handler has already checked and, if necessary, byte-swapped the * incoming request message body, but I am responsible for the * message buffers. */ req_capsule_init(&req->rq_pill, req, RCL_SERVER); if (req->rq_export == NULL) { struct ldlm_request *dlm_req; CERROR("%s from %s arrived at %lu with bad export cookie " LPU64"\n", ll_opcode2str(lustre_msg_get_opc(req->rq_reqmsg)), libcfs_nid2str(req->rq_peer.nid), req->rq_arrival_time.tv_sec, lustre_msg_get_handle(req->rq_reqmsg)->cookie); if (lustre_msg_get_opc(req->rq_reqmsg) == LDLM_CANCEL) { req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK); dlm_req = req_capsule_client_get(&req->rq_pill, &RMF_DLM_REQ); if (dlm_req != NULL) ldlm_lock_dump_handle(D_ERROR, &dlm_req->lock_handle[0]); } ldlm_callback_reply(req, -ENOTCONN); RETURN(0); } switch (lustre_msg_get_opc(req->rq_reqmsg)) { /* XXX FIXME move this back to mds/handler.c, bug 249 */ case LDLM_CANCEL: req_capsule_set(&req->rq_pill, &RQF_LDLM_CANCEL); CDEBUG(D_INODE, "cancel\n"); if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CANCEL)) RETURN(0); rc = ldlm_handle_cancel(req); if (rc) break; RETURN(0); case OBD_LOG_CANCEL: req_capsule_set(&req->rq_pill, &RQF_LOG_CANCEL); if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_NET)) RETURN(0); rc = llog_origin_handle_cancel(req); if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LOG_CANCEL_REP)) RETURN(0); ldlm_callback_reply(req, rc); RETURN(0); default: CERROR("invalid opcode %d\n", lustre_msg_get_opc(req->rq_reqmsg)); req_capsule_set(&req->rq_pill, &RQF_LDLM_CALLBACK); ldlm_callback_reply(req, -EINVAL); } RETURN(0); } int ldlm_revoke_lock_cb(cfs_hash_t *hs, cfs_hash_bd_t *bd, cfs_hlist_node_t *hnode, void *data) { cfs_list_t *rpc_list = data; struct ldlm_lock *lock = cfs_hash_object(hs, hnode); lock_res_and_lock(lock); if (lock->l_req_mode != lock->l_granted_mode) { unlock_res_and_lock(lock); return 0; } LASSERT(lock->l_resource); if (lock->l_resource->lr_type != LDLM_IBITS && lock->l_resource->lr_type != LDLM_PLAIN) { unlock_res_and_lock(lock); return 0; } if (lock->l_flags & LDLM_FL_AST_SENT) { unlock_res_and_lock(lock); return 0; } LASSERT(lock->l_blocking_ast); LASSERT(!lock->l_blocking_lock); lock->l_flags |= LDLM_FL_AST_SENT; if (lock->l_export && lock->l_export->exp_lock_hash && !cfs_hlist_unhashed(&lock->l_exp_hash)) cfs_hash_del(lock->l_export->exp_lock_hash, &lock->l_remote_handle, &lock->l_exp_hash); cfs_list_add_tail(&lock->l_rk_ast, rpc_list); LDLM_LOCK_GET(lock); unlock_res_and_lock(lock); return 0; } void ldlm_revoke_export_locks(struct obd_export *exp) { cfs_list_t rpc_list; ENTRY; CFS_INIT_LIST_HEAD(&rpc_list); cfs_hash_for_each_empty(exp->exp_lock_hash, ldlm_revoke_lock_cb, &rpc_list); ldlm_run_ast_work(exp->exp_obd->obd_namespace, &rpc_list, LDLM_WORK_REVOKE_AST); EXIT; } #ifdef __KERNEL__ static struct ldlm_bl_work_item *ldlm_bl_get_work(struct ldlm_bl_pool *blp) { struct ldlm_bl_work_item *blwi = NULL; static unsigned int num_bl = 0; cfs_spin_lock(&blp->blp_lock); /* process a request from the blp_list at least every blp_num_threads */ if (!cfs_list_empty(&blp->blp_list) && (cfs_list_empty(&blp->blp_prio_list) || num_bl == 0)) blwi = cfs_list_entry(blp->blp_list.next, struct ldlm_bl_work_item, blwi_entry); else if (!cfs_list_empty(&blp->blp_prio_list)) blwi = cfs_list_entry(blp->blp_prio_list.next, struct ldlm_bl_work_item, blwi_entry); if (blwi) { if (++num_bl >= cfs_atomic_read(&blp->blp_num_threads)) num_bl = 0; cfs_list_del(&blwi->blwi_entry); } cfs_spin_unlock(&blp->blp_lock); return blwi; } /* This only contains temporary data until the thread starts */ struct ldlm_bl_thread_data { char bltd_name[CFS_CURPROC_COMM_MAX]; struct ldlm_bl_pool *bltd_blp; cfs_completion_t bltd_comp; int bltd_num; }; static int ldlm_bl_thread_main(void *arg); static int ldlm_bl_thread_start(struct ldlm_bl_pool *blp) { struct ldlm_bl_thread_data bltd = { .bltd_blp = blp }; int rc; cfs_init_completion(&bltd.bltd_comp); rc = cfs_create_thread(ldlm_bl_thread_main, &bltd, 0); if (rc < 0) { CERROR("cannot start LDLM thread ldlm_bl_%02d: rc %d\n", cfs_atomic_read(&blp->blp_num_threads), rc); return rc; } cfs_wait_for_completion(&bltd.bltd_comp); return 0; } static int ldlm_bl_thread_main(void *arg) { struct ldlm_bl_pool *blp; ENTRY; { struct ldlm_bl_thread_data *bltd = arg; blp = bltd->bltd_blp; bltd->bltd_num = cfs_atomic_inc_return(&blp->blp_num_threads) - 1; cfs_atomic_inc(&blp->blp_busy_threads); snprintf(bltd->bltd_name, sizeof(bltd->bltd_name) - 1, "ldlm_bl_%02d", bltd->bltd_num); cfs_daemonize(bltd->bltd_name); cfs_complete(&bltd->bltd_comp); /* cannot use bltd after this, it is only on caller's stack */ } while (1) { struct l_wait_info lwi = { 0 }; struct ldlm_bl_work_item *blwi = NULL; blwi = ldlm_bl_get_work(blp); if (blwi == NULL) { int busy; cfs_atomic_dec(&blp->blp_busy_threads); l_wait_event_exclusive(blp->blp_waitq, (blwi = ldlm_bl_get_work(blp)) != NULL, &lwi); busy = cfs_atomic_inc_return(&blp->blp_busy_threads); if (blwi->blwi_ns == NULL) /* added by ldlm_cleanup() */ break; /* Not fatal if racy and have a few too many threads */ if (unlikely(busy < blp->blp_max_threads && busy >= cfs_atomic_read(&blp->blp_num_threads) && !blwi->blwi_mem_pressure)) /* discard the return value, we tried */ ldlm_bl_thread_start(blp); } else { if (blwi->blwi_ns == NULL) /* added by ldlm_cleanup() */ break; } if (blwi->blwi_mem_pressure) cfs_memory_pressure_set(); if (blwi->blwi_count) { int count; /* The special case when we cancel locks in lru * asynchronously, we pass the list of locks here. * Thus locks are marked LDLM_FL_CANCELING, but NOT * canceled locally yet. */ count = ldlm_cli_cancel_list_local(&blwi->blwi_head, blwi->blwi_count, LCF_BL_AST); ldlm_cli_cancel_list(&blwi->blwi_head, count, NULL, 0); } else { ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld, blwi->blwi_lock); } if (blwi->blwi_mem_pressure) cfs_memory_pressure_clr(); if (blwi->blwi_mode == LDLM_ASYNC) OBD_FREE(blwi, sizeof(*blwi)); else cfs_complete(&blwi->blwi_comp); } cfs_atomic_dec(&blp->blp_busy_threads); cfs_atomic_dec(&blp->blp_num_threads); cfs_complete(&blp->blp_comp); RETURN(0); } #endif static int ldlm_setup(void); static int ldlm_cleanup(void); int ldlm_get_ref(void) { int rc = 0; ENTRY; cfs_mutex_down(&ldlm_ref_sem); if (++ldlm_refcount == 1) { rc = ldlm_setup(); if (rc) ldlm_refcount--; } cfs_mutex_up(&ldlm_ref_sem); RETURN(rc); } void ldlm_put_ref(void) { ENTRY; cfs_mutex_down(&ldlm_ref_sem); if (ldlm_refcount == 1) { int rc = ldlm_cleanup(); if (rc) CERROR("ldlm_cleanup failed: %d\n", rc); else ldlm_refcount--; } else { ldlm_refcount--; } cfs_mutex_up(&ldlm_ref_sem); EXIT; } /* * Export handle<->lock hash operations. */ static unsigned ldlm_export_lock_hash(cfs_hash_t *hs, const void *key, unsigned mask) { return cfs_hash_u64_hash(((struct lustre_handle *)key)->cookie, mask); } static void * ldlm_export_lock_key(cfs_hlist_node_t *hnode) { struct ldlm_lock *lock; lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash); return &lock->l_remote_handle; } static void ldlm_export_lock_keycpy(cfs_hlist_node_t *hnode, void *key) { struct ldlm_lock *lock; lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash); lock->l_remote_handle = *(struct lustre_handle *)key; } static int ldlm_export_lock_keycmp(const void *key, cfs_hlist_node_t *hnode) { return lustre_handle_equal(ldlm_export_lock_key(hnode), key); } static void * ldlm_export_lock_object(cfs_hlist_node_t *hnode) { return cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash); } static void ldlm_export_lock_get(cfs_hash_t *hs, cfs_hlist_node_t *hnode) { struct ldlm_lock *lock; lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash); LDLM_LOCK_GET(lock); } static void ldlm_export_lock_put(cfs_hash_t *hs, cfs_hlist_node_t *hnode) { struct ldlm_lock *lock; lock = cfs_hlist_entry(hnode, struct ldlm_lock, l_exp_hash); LDLM_LOCK_RELEASE(lock); } static cfs_hash_ops_t ldlm_export_lock_ops = { .hs_hash = ldlm_export_lock_hash, .hs_key = ldlm_export_lock_key, .hs_keycmp = ldlm_export_lock_keycmp, .hs_keycpy = ldlm_export_lock_keycpy, .hs_object = ldlm_export_lock_object, .hs_get = ldlm_export_lock_get, .hs_put = ldlm_export_lock_put, .hs_put_locked = ldlm_export_lock_put, }; int ldlm_init_export(struct obd_export *exp) { ENTRY; exp->exp_lock_hash = cfs_hash_create(obd_uuid2str(&exp->exp_client_uuid), HASH_EXP_LOCK_CUR_BITS, HASH_EXP_LOCK_MAX_BITS, HASH_EXP_LOCK_BKT_BITS, 0, CFS_HASH_MIN_THETA, CFS_HASH_MAX_THETA, &ldlm_export_lock_ops, CFS_HASH_DEFAULT | CFS_HASH_REHASH_KEY | CFS_HASH_NBLK_CHANGE); if (!exp->exp_lock_hash) RETURN(-ENOMEM); RETURN(0); } EXPORT_SYMBOL(ldlm_init_export); void ldlm_destroy_export(struct obd_export *exp) { ENTRY; cfs_hash_putref(exp->exp_lock_hash); exp->exp_lock_hash = NULL; EXIT; } EXPORT_SYMBOL(ldlm_destroy_export); static int ldlm_setup(void) { struct ldlm_bl_pool *blp; int rc = 0; int ldlm_min_threads = LDLM_THREADS_AUTO_MIN; int ldlm_max_threads = LDLM_THREADS_AUTO_MAX; #ifdef __KERNEL__ int i; #endif ENTRY; if (ldlm_state != NULL) RETURN(-EALREADY); OBD_ALLOC(ldlm_state, sizeof(*ldlm_state)); if (ldlm_state == NULL) RETURN(-ENOMEM); #ifdef LPROCFS rc = ldlm_proc_setup(); if (rc != 0) GOTO(out_free, rc); #endif #ifdef __KERNEL__ if (ldlm_num_threads) { /* If ldlm_num_threads is set, it is the min and the max. */ if (ldlm_num_threads > LDLM_THREADS_AUTO_MAX) ldlm_num_threads = LDLM_THREADS_AUTO_MAX; if (ldlm_num_threads < LDLM_THREADS_AUTO_MIN) ldlm_num_threads = LDLM_THREADS_AUTO_MIN; ldlm_min_threads = ldlm_max_threads = ldlm_num_threads; } #endif ldlm_state->ldlm_cb_service = ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE, LDLM_MAXREPSIZE, LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL, 2, ldlm_callback_handler, "ldlm_cbd", ldlm_svc_proc_dir, NULL, ldlm_min_threads, ldlm_max_threads, "ldlm_cb", LCT_MD_THREAD|LCT_DT_THREAD, NULL); if (!ldlm_state->ldlm_cb_service) { CERROR("failed to start service\n"); GOTO(out_proc, rc = -ENOMEM); } ldlm_state->ldlm_cancel_service = ptlrpc_init_svc(LDLM_NBUFS, LDLM_BUFSIZE, LDLM_MAXREQSIZE, LDLM_MAXREPSIZE, LDLM_CANCEL_REQUEST_PORTAL, LDLM_CANCEL_REPLY_PORTAL, 6, ldlm_cancel_handler, "ldlm_canceld", ldlm_svc_proc_dir, NULL, ldlm_min_threads, ldlm_max_threads, "ldlm_cn", LCT_MD_THREAD|LCT_DT_THREAD|LCT_CL_THREAD, NULL); if (!ldlm_state->ldlm_cancel_service) { CERROR("failed to start service\n"); GOTO(out_proc, rc = -ENOMEM); } OBD_ALLOC(blp, sizeof(*blp)); if (blp == NULL) GOTO(out_proc, rc = -ENOMEM); ldlm_state->ldlm_bl_pool = blp; cfs_spin_lock_init(&blp->blp_lock); CFS_INIT_LIST_HEAD(&blp->blp_list); CFS_INIT_LIST_HEAD(&blp->blp_prio_list); cfs_waitq_init(&blp->blp_waitq); cfs_atomic_set(&blp->blp_num_threads, 0); cfs_atomic_set(&blp->blp_busy_threads, 0); blp->blp_min_threads = ldlm_min_threads; blp->blp_max_threads = ldlm_max_threads; #ifdef __KERNEL__ for (i = 0; i < blp->blp_min_threads; i++) { rc = ldlm_bl_thread_start(blp); if (rc < 0) GOTO(out_thread, rc); } rc = ptlrpc_start_threads(ldlm_state->ldlm_cancel_service); if (rc) GOTO(out_thread, rc); rc = ptlrpc_start_threads(ldlm_state->ldlm_cb_service); if (rc) GOTO(out_thread, rc); CFS_INIT_LIST_HEAD(&expired_lock_thread.elt_expired_locks); expired_lock_thread.elt_state = ELT_STOPPED; cfs_waitq_init(&expired_lock_thread.elt_waitq); CFS_INIT_LIST_HEAD(&waiting_locks_list); cfs_spin_lock_init(&waiting_locks_spinlock); cfs_timer_init(&waiting_locks_timer, waiting_locks_callback, 0); rc = cfs_create_thread(expired_lock_main, NULL, CFS_DAEMON_FLAGS); if (rc < 0) { CERROR("Cannot start ldlm expired-lock thread: %d\n", rc); GOTO(out_thread, rc); } cfs_wait_event(expired_lock_thread.elt_waitq, expired_lock_thread.elt_state == ELT_READY); #endif #ifdef __KERNEL__ rc = ldlm_pools_init(); if (rc) GOTO(out_thread, rc); #endif RETURN(0); #ifdef __KERNEL__ out_thread: ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service); ptlrpc_unregister_service(ldlm_state->ldlm_cb_service); #endif out_proc: #ifdef LPROCFS ldlm_proc_cleanup(); out_free: #endif OBD_FREE(ldlm_state, sizeof(*ldlm_state)); ldlm_state = NULL; return rc; } static int ldlm_cleanup(void) { #ifdef __KERNEL__ struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool; #endif ENTRY; if (!cfs_list_empty(ldlm_namespace_list(LDLM_NAMESPACE_SERVER)) || !cfs_list_empty(ldlm_namespace_list(LDLM_NAMESPACE_CLIENT))) { CERROR("ldlm still has namespaces; clean these up first.\n"); ldlm_dump_all_namespaces(LDLM_NAMESPACE_SERVER, D_DLMTRACE); ldlm_dump_all_namespaces(LDLM_NAMESPACE_CLIENT, D_DLMTRACE); RETURN(-EBUSY); } #ifdef __KERNEL__ ldlm_pools_fini(); #endif #ifdef __KERNEL__ while (cfs_atomic_read(&blp->blp_num_threads) > 0) { struct ldlm_bl_work_item blwi = { .blwi_ns = NULL }; cfs_init_completion(&blp->blp_comp); cfs_spin_lock(&blp->blp_lock); cfs_list_add_tail(&blwi.blwi_entry, &blp->blp_list); cfs_waitq_signal(&blp->blp_waitq); cfs_spin_unlock(&blp->blp_lock); cfs_wait_for_completion(&blp->blp_comp); } OBD_FREE(blp, sizeof(*blp)); ptlrpc_unregister_service(ldlm_state->ldlm_cb_service); ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service); ldlm_proc_cleanup(); expired_lock_thread.elt_state = ELT_TERMINATE; cfs_waitq_signal(&expired_lock_thread.elt_waitq); cfs_wait_event(expired_lock_thread.elt_waitq, expired_lock_thread.elt_state == ELT_STOPPED); #else ptlrpc_unregister_service(ldlm_state->ldlm_cb_service); ptlrpc_unregister_service(ldlm_state->ldlm_cancel_service); #endif OBD_FREE(ldlm_state, sizeof(*ldlm_state)); ldlm_state = NULL; RETURN(0); } int __init ldlm_init(void) { cfs_init_mutex(&ldlm_ref_sem); cfs_init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_SERVER)); cfs_init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT)); ldlm_resource_slab = cfs_mem_cache_create("ldlm_resources", sizeof(struct ldlm_resource), 0, CFS_SLAB_HWCACHE_ALIGN); if (ldlm_resource_slab == NULL) return -ENOMEM; ldlm_lock_slab = cfs_mem_cache_create("ldlm_locks", sizeof(struct ldlm_lock), 0, CFS_SLAB_HWCACHE_ALIGN | CFS_SLAB_DESTROY_BY_RCU); if (ldlm_lock_slab == NULL) { cfs_mem_cache_destroy(ldlm_resource_slab); return -ENOMEM; } ldlm_interval_slab = cfs_mem_cache_create("interval_node", sizeof(struct ldlm_interval), 0, CFS_SLAB_HWCACHE_ALIGN); if (ldlm_interval_slab == NULL) { cfs_mem_cache_destroy(ldlm_resource_slab); cfs_mem_cache_destroy(ldlm_lock_slab); return -ENOMEM; } #if LUSTRE_TRACKS_LOCK_EXP_REFS class_export_dump_hook = ldlm_dump_export_locks; #endif return 0; } void __exit ldlm_exit(void) { int rc; if (ldlm_refcount) CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount); rc = cfs_mem_cache_destroy(ldlm_resource_slab); LASSERTF(rc == 0, "couldn't free ldlm resource slab\n"); #ifdef __KERNEL__ /* ldlm_lock_put() use RCU to call ldlm_lock_free, so need call * synchronize_rcu() to wait a grace period elapsed, so that * ldlm_lock_free() get a chance to be called. */ synchronize_rcu(); #endif rc = cfs_mem_cache_destroy(ldlm_lock_slab); LASSERTF(rc == 0, "couldn't free ldlm lock slab\n"); rc = cfs_mem_cache_destroy(ldlm_interval_slab); LASSERTF(rc == 0, "couldn't free interval node slab\n"); } /* ldlm_extent.c */ EXPORT_SYMBOL(ldlm_extent_shift_kms); /* ldlm_lock.c */ EXPORT_SYMBOL(ldlm_get_processing_policy); EXPORT_SYMBOL(ldlm_lock2desc); EXPORT_SYMBOL(ldlm_register_intent); EXPORT_SYMBOL(ldlm_lockname); EXPORT_SYMBOL(ldlm_typename); EXPORT_SYMBOL(ldlm_lock2handle); EXPORT_SYMBOL(__ldlm_handle2lock); EXPORT_SYMBOL(ldlm_lock_get); EXPORT_SYMBOL(ldlm_lock_put); EXPORT_SYMBOL(ldlm_lock_match); EXPORT_SYMBOL(ldlm_lock_cancel); EXPORT_SYMBOL(ldlm_lock_addref); EXPORT_SYMBOL(ldlm_lock_addref_try); EXPORT_SYMBOL(ldlm_lock_decref); EXPORT_SYMBOL(ldlm_lock_decref_and_cancel); EXPORT_SYMBOL(ldlm_lock_change_resource); EXPORT_SYMBOL(ldlm_it2str); EXPORT_SYMBOL(ldlm_lock_dump); EXPORT_SYMBOL(ldlm_lock_dump_handle); EXPORT_SYMBOL(ldlm_reprocess_all_ns); EXPORT_SYMBOL(ldlm_lock_allow_match_locked); EXPORT_SYMBOL(ldlm_lock_allow_match); EXPORT_SYMBOL(ldlm_lock_downgrade); EXPORT_SYMBOL(ldlm_lock_convert); /* ldlm_request.c */ EXPORT_SYMBOL(ldlm_completion_ast_async); EXPORT_SYMBOL(ldlm_blocking_ast_nocheck); EXPORT_SYMBOL(ldlm_completion_ast); EXPORT_SYMBOL(ldlm_blocking_ast); EXPORT_SYMBOL(ldlm_glimpse_ast); EXPORT_SYMBOL(ldlm_expired_completion_wait); EXPORT_SYMBOL(ldlm_prep_enqueue_req); EXPORT_SYMBOL(ldlm_prep_elc_req); EXPORT_SYMBOL(ldlm_cli_convert); EXPORT_SYMBOL(ldlm_cli_enqueue); EXPORT_SYMBOL(ldlm_cli_enqueue_fini); EXPORT_SYMBOL(ldlm_cli_enqueue_local); EXPORT_SYMBOL(ldlm_cli_cancel); EXPORT_SYMBOL(ldlm_cli_cancel_unused); EXPORT_SYMBOL(ldlm_cli_cancel_unused_resource); EXPORT_SYMBOL(ldlm_cli_cancel_req); EXPORT_SYMBOL(ldlm_replay_locks); EXPORT_SYMBOL(ldlm_resource_foreach); EXPORT_SYMBOL(ldlm_namespace_foreach); EXPORT_SYMBOL(ldlm_resource_iterate); EXPORT_SYMBOL(ldlm_cancel_resource_local); EXPORT_SYMBOL(ldlm_cli_cancel_list_local); EXPORT_SYMBOL(ldlm_cli_cancel_list); /* ldlm_lockd.c */ EXPORT_SYMBOL(ldlm_server_blocking_ast); EXPORT_SYMBOL(ldlm_server_completion_ast); EXPORT_SYMBOL(ldlm_server_glimpse_ast); EXPORT_SYMBOL(ldlm_handle_enqueue); EXPORT_SYMBOL(ldlm_handle_enqueue0); EXPORT_SYMBOL(ldlm_handle_cancel); EXPORT_SYMBOL(ldlm_request_cancel); EXPORT_SYMBOL(ldlm_handle_convert); EXPORT_SYMBOL(ldlm_handle_convert0); EXPORT_SYMBOL(ldlm_del_waiting_lock); EXPORT_SYMBOL(ldlm_get_ref); EXPORT_SYMBOL(ldlm_put_ref); EXPORT_SYMBOL(ldlm_refresh_waiting_lock); EXPORT_SYMBOL(ldlm_revoke_export_locks); /* ldlm_resource.c */ EXPORT_SYMBOL(ldlm_namespace_new); EXPORT_SYMBOL(ldlm_namespace_cleanup); EXPORT_SYMBOL(ldlm_namespace_free); EXPORT_SYMBOL(ldlm_namespace_dump); EXPORT_SYMBOL(ldlm_dump_all_namespaces); EXPORT_SYMBOL(ldlm_resource_get); EXPORT_SYMBOL(ldlm_resource_putref); EXPORT_SYMBOL(ldlm_resource_unlink_lock); /* ldlm_lib.c */ EXPORT_SYMBOL(client_import_add_conn); EXPORT_SYMBOL(client_import_del_conn); EXPORT_SYMBOL(client_obd_setup); EXPORT_SYMBOL(client_obd_cleanup); EXPORT_SYMBOL(client_connect_import); EXPORT_SYMBOL(client_disconnect_export); EXPORT_SYMBOL(server_disconnect_export); EXPORT_SYMBOL(target_stop_recovery_thread); EXPORT_SYMBOL(target_handle_connect); EXPORT_SYMBOL(target_cleanup_recovery); EXPORT_SYMBOL(target_destroy_export); EXPORT_SYMBOL(target_cancel_recovery_timer); EXPORT_SYMBOL(target_send_reply); EXPORT_SYMBOL(target_queue_recovery_request); EXPORT_SYMBOL(target_handle_ping); EXPORT_SYMBOL(target_pack_pool_reply); EXPORT_SYMBOL(target_handle_disconnect); /* l_lock.c */ EXPORT_SYMBOL(lock_res_and_lock); EXPORT_SYMBOL(unlock_res_and_lock);