/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * * Copyright (C) 2002-2004 Cluster File Systems, Inc. * Author: Peter Braam * Author: Phil Schwan * * This file is part of the Lustre file system, http://www.lustre.org * Lustre is a trademark of Cluster File Systems, Inc. * * You may have signed or agreed to another license before downloading * this software. If so, you are bound by the terms and conditions * of that agreement, and the following does not apply to you. See the * LICENSE file included with this distribution for more information. * * If you did not agree to a different license, then this copy of Lustre * is open source software; you can redistribute it and/or modify it * under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * In either case, Lustre 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 * license text for more details. */ #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 struct semaphore ldlm_ref_sem; static int ldlm_refcount; /* 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 */ static inline unsigned int ldlm_get_rq_timeout(unsigned int ldlm_timeout, unsigned int obd_timeout) { 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 spinlock_t waiting_locks_spinlock; /* BH lock (timer) */ static struct list_head 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; struct list_head elt_expired_locks; } expired_lock_thread; #endif #define ELT_STOPPED 0 #define ELT_READY 1 #define ELT_TERMINATE 2 struct ldlm_bl_pool { spinlock_t blp_lock; struct list_head blp_list; cfs_waitq_t blp_waitq; struct completion blp_comp; atomic_t blp_num_threads; atomic_t blp_busy_threads; int blp_min_threads; int blp_max_threads; }; struct ldlm_bl_work_item { struct list_head blwi_entry; struct ldlm_namespace *blwi_ns; struct ldlm_lock_desc blwi_ld; struct ldlm_lock *blwi_lock; struct list_head blwi_head; int blwi_count; }; #ifdef __KERNEL__ static inline int have_expired_locks(void) { int need_to_run; ENTRY; spin_lock_bh(&waiting_locks_spinlock); need_to_run = !list_empty(&expired_lock_thread.elt_expired_locks); spin_unlock_bh(&waiting_locks_spinlock); RETURN(need_to_run); } static int expired_lock_main(void *arg) { struct list_head *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); spin_lock_bh(&waiting_locks_spinlock); if (expired_lock_thread.elt_dump) { 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); spin_lock_bh(&waiting_locks_spinlock); expired_lock_thread.elt_dump = 0; } do_dump = 0; while (!list_empty(expired)) { struct obd_export *export; struct ldlm_lock *lock; lock = list_entry(expired->next, struct ldlm_lock, l_pending_chain); if ((void *)lock < LP_POISON + CFS_PAGE_SIZE && (void *)lock >= LP_POISON) { spin_unlock_bh(&waiting_locks_spinlock); CERROR("free lock on elt list %p\n", lock); LBUG(); } 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"); continue; } export = class_export_get(lock->l_export); spin_unlock_bh(&waiting_locks_spinlock); do_dump++; class_fail_export(export); class_export_put(export); spin_lock_bh(&waiting_locks_spinlock); } 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); /* 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: spin_lock_bh(&waiting_locks_spinlock); while (!list_empty(&waiting_locks_list)) { lock = 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)); list_del_init(&lock->l_pending_chain); 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)); list_del_init(&lock->l_pending_chain); spin_unlock_bh(&waiting_locks_spinlock); ldlm_add_waiting_lock(lock); goto repeat; } LDLM_ERROR(lock, "lock callback timer expired: evicting client " "%s@%s nid %s\n", 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)); last = lock; list_del(&lock->l_pending_chain); list_add(&lock->l_pending_chain, &expired_lock_thread.elt_expired_locks); } if (!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 (!list_empty(&waiting_locks_list)) { cfs_time_t timeout_rounded; lock = 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); } 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). * * Called with the namespace lock held. */ static int __ldlm_add_waiting_lock(struct ldlm_lock *lock) { cfs_time_t timeout_rounded; if (!list_empty(&lock->l_pending_chain)) return 0; lock->l_callback_timeout =cfs_time_add(cfs_time_current(), cfs_time_seconds(obd_timeout)/2); 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); } list_add_tail(&lock->l_pending_chain, &waiting_locks_list); /* FIFO */ return 1; } static int ldlm_add_waiting_lock(struct ldlm_lock *lock) { int ret; LASSERT(!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)); spin_lock_bh(&waiting_locks_spinlock); if (lock->l_destroyed) { static cfs_time_t next; 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); spin_unlock_bh(&waiting_locks_spinlock); LDLM_DEBUG(lock, "%sadding to wait list", ret == 0 ? "not re-" : ""); 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. * * Called with namespace lock held. */ int __ldlm_del_waiting_lock(struct ldlm_lock *lock) { struct list_head *list_next; if (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 = list_entry(list_next, struct ldlm_lock, l_pending_chain); cfs_timer_arm(&waiting_locks_timer, round_timeout(next->l_callback_timeout)); } } 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. */ LDLM_DEBUG(lock, "client lock: no-op"); return 0; } spin_lock_bh(&waiting_locks_spinlock); ret = __ldlm_del_waiting_lock(lock); spin_unlock_bh(&waiting_locks_spinlock); 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) { if (lock->l_export == NULL) { /* We don't have a "waiting locks list" on clients. */ LDLM_DEBUG(lock, "client lock: no-op"); return 0; } spin_lock_bh(&waiting_locks_spinlock); if (list_empty(&lock->l_pending_chain)) { spin_unlock_bh(&waiting_locks_spinlock); LDLM_DEBUG(lock, "wasn't waiting"); return 0; } __ldlm_del_waiting_lock(lock); __ldlm_add_waiting_lock(lock); 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) { RETURN(0); } #endif /* __KERNEL__ */ static void ldlm_failed_ast(struct ldlm_lock *lock, int rc, const char *ast_type) { struct ptlrpc_connection *conn = lock->l_export->exp_connection; char *str = libcfs_nid2str(conn->c_peer.nid); LCONSOLE_ERROR_MSG(0x138, "A client on nid %s was evicted from " "service %s.\n", str, lock->l_export->exp_obd->obd_name); LCONSOLE_ERROR_MSG(0x012, "Lock %s callback to %s timed out for " "resource %d\n", ast_type, obd_export_nid2str(lock->l_export), rc); if (obd_dump_on_timeout) libcfs_debug_dumplog(); class_fail_export(lock->l_export); } 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) 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); 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(struct ptlrpc_request *req, void *data, int rc) { struct ldlm_cb_set_arg *arg; struct ldlm_lock *lock; ENTRY; LASSERT(data != NULL); arg = req->rq_async_args.pointer_arg[0]; lock = req->rq_async_args.pointer_arg[1]; LASSERT(lock != NULL); if (rc != 0) { /* If client canceled the lock but the cancel has not * been recieved yet, we need to update lvbo to have the * proper attributes cached. */ if (rc == -EINVAL && arg->type == LDLM_BL_CALLBACK) ldlm_res_lvbo_update(lock->l_resource, NULL, 0, 1); rc = ldlm_handle_ast_error(lock, req, rc, arg->type == LDLM_BL_CALLBACK ? "blocking" : "completion"); } LDLM_LOCK_PUT(lock); if (rc == -ERESTART) atomic_set(&arg->restart, 1); RETURN(0); } static inline int ldlm_bl_and_cp_ast_fini(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) /* If we cancelled the lock, we need to restart * ldlm_reprocess_queue */ atomic_set(&arg->restart, 1); } else { LDLM_LOCK_GET(lock); ptlrpc_set_add_req(arg->set, req); } RETURN(rc); } /* * ->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_set_arg *arg = data; struct ldlm_request *body; struct ptlrpc_request *req; int size[] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body), [DLM_LOCKREQ_OFF] = sizeof(*body) }; int instant_cancel = 0, rc; 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); } req = ptlrpc_prep_req(lock->l_export->exp_imp_reverse, LUSTRE_DLM_VERSION, LDLM_BL_CALLBACK, 2, size, NULL); if (req == NULL) RETURN(-ENOMEM); req->rq_async_args.pointer_arg[0] = arg; req->rq_async_args.pointer_arg[1] = 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 = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body)); 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_req_set_repsize(req, 1, NULL); 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; req->rq_timeout = ldlm_get_rq_timeout(ldlm_timeout, obd_timeout); if (lock->l_export && lock->l_export->exp_ldlm_stats) lprocfs_counter_incr(lock->l_export->exp_ldlm_stats, LDLM_BL_CALLBACK - LDLM_FIRST_OPC); rc = ldlm_bl_and_cp_ast_fini(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 timeval granted_time; long total_enqueue_wait; int size[3] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body), [DLM_LOCKREQ_OFF] = sizeof(*body) }; int rc, buffers = 2, instant_cancel = 0; ENTRY; LASSERT(lock != NULL); LASSERT(data != NULL); do_gettimeofday(&granted_time); total_enqueue_wait = cfs_timeval_sub(&granted_time, &lock->l_enqueued_time, NULL); if (total_enqueue_wait / 1000000 > obd_timeout) LDLM_ERROR(lock, "enqueue wait took %luus from %lu", total_enqueue_wait, lock->l_enqueued_time.tv_sec); lock_res_and_lock(lock); if (lock->l_resource->lr_lvb_len) { size[DLM_REQ_REC_OFF] = lock->l_resource->lr_lvb_len; buffers = 3; } unlock_res_and_lock(lock); req = ptlrpc_prep_req(lock->l_export->exp_imp_reverse, LUSTRE_DLM_VERSION, LDLM_CP_CALLBACK, buffers, size, NULL); if (req == NULL) RETURN(-ENOMEM); req->rq_async_args.pointer_arg[0] = arg; req->rq_async_args.pointer_arg[1] = lock; req->rq_interpret_reply = ldlm_cb_interpret; req->rq_no_resend = 1; body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body)); body->lock_handle[0] = lock->l_remote_handle; body->lock_flags = flags; ldlm_lock2desc(lock, &body->lock_desc); if (buffers == 3) { void *lvb; lvb = lustre_msg_buf(req->rq_reqmsg, DLM_REQ_REC_OFF, lock->l_resource->lr_lvb_len); lock_res_and_lock(lock); memcpy(lvb, lock->l_resource->lr_lvb_data, lock->l_resource->lr_lvb_len); unlock_res_and_lock(lock); } LDLM_DEBUG(lock, "server preparing completion AST (after %ldus wait)", total_enqueue_wait); ptlrpc_req_set_repsize(req, 1, NULL); req->rq_send_state = LUSTRE_IMP_FULL; req->rq_timeout = ldlm_get_rq_timeout(ldlm_timeout, obd_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; /* 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_ldlm_stats) lprocfs_counter_incr(lock->l_export->exp_ldlm_stats, LDLM_CP_CALLBACK - LDLM_FIRST_OPC); rc = ldlm_bl_and_cp_ast_fini(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 size[] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body), [DLM_LOCKREQ_OFF] = sizeof(*body) }; int rc = 0; ENTRY; LASSERT(lock != NULL); req = ptlrpc_prep_req(lock->l_export->exp_imp_reverse, LUSTRE_DLM_VERSION, LDLM_GL_CALLBACK, 2, size, NULL); if (req == NULL) RETURN(-ENOMEM); body = lustre_msg_buf(req->rq_reqmsg, DLM_LOCKREQ_OFF, sizeof(*body)); body->lock_handle[0] = lock->l_remote_handle; ldlm_lock2desc(lock, &body->lock_desc); lock_res_and_lock(lock); size[REPLY_REC_OFF] = lock->l_resource->lr_lvb_len; unlock_res_and_lock(lock); res = lock->l_resource; ptlrpc_req_set_repsize(req, 2, size); req->rq_send_state = LUSTRE_IMP_FULL; req->rq_timeout = ldlm_get_rq_timeout(ldlm_timeout, obd_timeout); if (lock->l_export && lock->l_export->exp_ldlm_stats) lprocfs_counter_incr(lock->l_export->exp_ldlm_stats, LDLM_GL_CALLBACK - LDLM_FIRST_OPC); rc = ptlrpc_queue_wait(req); if (rc == -ELDLM_NO_LOCK_DATA) LDLM_DEBUG(lock, "lost race - client has a lock but no inode"); else if (rc != 0) rc = ldlm_handle_ast_error(lock, req, rc, "glimpse"); else rc = ldlm_res_lvbo_update(res, req->rq_repmsg, REPLY_REC_OFF, 1); ptlrpc_req_finished(req); RETURN(rc); } static struct ldlm_lock * find_existing_lock(struct obd_export *exp, const struct lustre_handle *remote_hdl) { struct list_head *iter; spin_lock(&exp->exp_ldlm_data.led_lock); list_for_each(iter, &exp->exp_ldlm_data.led_held_locks) { struct ldlm_lock *lock; lock = list_entry(iter, struct ldlm_lock, l_export_chain); if (lock->l_remote_handle.cookie == remote_hdl->cookie) { LDLM_LOCK_GET(lock); spin_unlock(&exp->exp_ldlm_data.led_lock); return lock; } } spin_unlock(&exp->exp_ldlm_data.led_lock); return NULL; } #ifdef __KERNEL__ extern unsigned long long lu_time_stamp_get(void); #else #define lu_time_stamp_get() time(NULL) #endif /* * 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; int size[3] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body), [DLM_LOCKREPLY_OFF] = sizeof(*dlm_rep) }; int rc = 0; __u32 flags; ldlm_error_t err = ELDLM_OK; struct ldlm_lock *lock = NULL; void *cookie = NULL; 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_export->exp_ldlm_stats) lprocfs_counter_incr(req->rq_export->exp_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)) { lock = find_existing_lock(req->rq_export, &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->lcs_blocking, cbs->lcs_completion, cbs->lcs_glimpse, NULL, 0); if (!lock) GOTO(out, rc = -ENOMEM); do_gettimeofday(&lock->l_enqueued_time); 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 has already * been evicted. Cancel it now instead. (bug 3822) */ if (req->rq_export->exp_failed) { LDLM_ERROR(lock, "lock on destroyed export %p", req->rq_export); GOTO(out, rc = -ENOTCONN); } lock->l_export = class_export_get(req->rq_export); spin_lock(&lock->l_export->exp_ldlm_data.led_lock); list_add(&lock->l_export_chain, &lock->l_export->exp_ldlm_data.led_held_locks); spin_unlock(&lock->l_export->exp_ldlm_data.led_lock); 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 { int buffers = 2; lock_res_and_lock(lock); if (lock->l_resource->lr_lvb_len) { size[DLM_REPLY_REC_OFF] = lock->l_resource->lr_lvb_len; buffers = 3; } unlock_res_and_lock(lock); if (OBD_FAIL_CHECK_ONCE(OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR)) GOTO(out, rc = -ENOMEM); rc = lustre_pack_reply(req, buffers, size, NULL); if (rc) GOTO(out, rc); } if (dlm_req->lock_desc.l_resource.lr_type != LDLM_PLAIN) lock->l_policy_data = dlm_req->lock_desc.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, &flags); if (err) GOTO(out, err); dlm_rep = lustre_msg_buf(req->rq_repmsg, DLM_LOCKREPLY_OFF, sizeof(*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 evicted. Cancel it now instead. (bug 5683) */ if (unlikely(req->rq_export->exp_failed || OBD_FAIL_CHECK_ONCE(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 immediatelly and would never be granted * in the future, causing timeouts on client. Not * granted lock will be cancelled immediatelly 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 %d\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 = lustre_msg_buf(req->rq_reqmsg, DLM_INTENT_IT_OFF, sizeof(*it)); 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 = err; if (req->rq_reply_state == NULL) { err = lustre_pack_reply(req, 1, NULL, NULL); if (rc == 0) rc = err; req->rq_status = rc; } /* 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); lock_res_and_lock(lock); if (rc == 0) { size[DLM_REPLY_REC_OFF] = lock->l_resource->lr_lvb_len; if (size[DLM_REPLY_REC_OFF] > 0) { void *lvb = lustre_msg_buf(req->rq_repmsg, DLM_REPLY_REC_OFF, size[DLM_REPLY_REC_OFF]); LASSERTF(lvb != NULL, "req %p, lock %p\n", req, lock); memcpy(lvb, lock->l_resource->lr_lvb_data, size[DLM_REPLY_REC_OFF]); } } else { 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_PUT(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) { int rc; struct ldlm_request *dlm_req; struct ldlm_callback_suite cbs = { .lcs_completion = completion_callback, .lcs_blocking = blocking_callback, .lcs_glimpse = glimpse_callback }; dlm_req = lustre_swab_reqbuf(req, DLM_LOCKREQ_OFF, sizeof *dlm_req, lustre_swab_ldlm_request); if (dlm_req != NULL) { rc = ldlm_handle_enqueue0(req->rq_export->exp_obd->obd_namespace, req, dlm_req, &cbs); } else { CERROR ("Can't unpack dlm_req\n"); 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; int size[2] = { [MSG_PTLRPC_BODY_OFF] = sizeof(struct ptlrpc_body), [DLM_LOCKREPLY_OFF] = sizeof(*dlm_rep) }; ENTRY; if (req->rq_export && req->rq_export->exp_ldlm_stats) lprocfs_counter_incr(req->rq_export->exp_ldlm_stats, LDLM_CONVERT - LDLM_FIRST_OPC); rc = lustre_pack_reply(req, 2, size, NULL); if (rc) RETURN(rc); dlm_rep = lustre_msg_buf(req->rq_repmsg, DLM_LOCKREPLY_OFF, sizeof(*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"); do_gettimeofday(&lock->l_enqueued_time); 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 = lustre_swab_reqbuf(req, DLM_LOCKREQ_OFF, sizeof *dlm_req, lustre_swab_ldlm_request); 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, which 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_putref(pres); } if (res != NULL) { ldlm_resource_getref(res); ldlm_res_lvbo_update(res, NULL, 0, 1); } pres = res; } ldlm_lock_cancel(lock); LDLM_LOCK_PUT(lock); } if (pres != NULL) { ldlm_reprocess_all(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 = lustre_swab_reqbuf(req, DLM_LOCKREQ_OFF, sizeof(*dlm_req), lustre_swab_ldlm_request); if (dlm_req == NULL) { CERROR("bad request buffer for cancel\n"); RETURN(-EFAULT); } if (req->rq_export && req->rq_export->exp_ldlm_stats) lprocfs_counter_incr(req->rq_export->exp_ldlm_stats, LDLM_CANCEL - LDLM_FIRST_OPC); rc = lustre_pack_reply(req, 1, NULL, NULL); if (rc) RETURN(rc); if (!ldlm_request_cancel(req, dlm_req, 0)) req->rq_status = ESTALE; if (ptlrpc_reply(req) != 0) LBUG(); RETURN(0); } 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 START"); 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) { LDLM_DEBUG(lock, "already unused, calling " "callback (%p)", lock->l_blocking_ast); if (lock->l_blocking_ast != NULL) lock->l_blocking_ast(lock, ld, lock->l_ast_data, LDLM_CB_BLOCKING); } else { LDLM_DEBUG(lock, "Lock still has references, will be" " cancelled later"); } LDLM_DEBUG(lock, "client blocking callback handler END"); LDLM_LOCK_PUT(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"); lock_res_and_lock(lock); /* 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) { lock->l_policy_data = dlm_req->lock_desc.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); ldlm_lock_change_resource(ns, lock, &dlm_req->lock_desc.l_resource.lr_name); 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) { lock->l_flags |= LDLM_FL_CBPENDING; LDLM_DEBUG(lock, "completion AST includes blocking AST"); } if (lock->l_lvb_len) { void *lvb; lvb = lustre_swab_reqbuf(req, DLM_REQ_REC_OFF, lock->l_lvb_len, lock->l_lvb_swabber); if (lvb == NULL) { LDLM_ERROR(lock, "completion AST did not contain " "expected LVB!"); } else { 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"); ldlm_run_cp_ast_work(&ast_list); LDLM_DEBUG_NOLOCK("client completion callback handler END (lock %p)", lock); LDLM_LOCK_PUT(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_PUT(lock); EXIT; } static int ldlm_callback_reply(struct ptlrpc_request *req, int rc) { req->rq_status = rc; if (req->rq_reply_state == NULL) { 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_namespace *ns, struct ldlm_lock_desc *ld, struct ldlm_lock *lock, struct list_head *cancels, int count) { struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool; struct ldlm_bl_work_item *blwi; ENTRY; if (cancels && count == 0) RETURN(0); OBD_ALLOC(blwi, sizeof(*blwi)); if (blwi == NULL) RETURN(-ENOMEM); blwi->blwi_ns = ns; if (ld != NULL) blwi->blwi_ld = *ld; if (count) { list_add(&blwi->blwi_head, cancels); list_del_init(cancels); blwi->blwi_count = count; } else { blwi->blwi_lock = lock; } spin_lock(&blp->blp_lock); list_add_tail(&blwi->blwi_entry, &blp->blp_list); cfs_waitq_signal(&blp->blp_waitq); spin_unlock(&blp->blp_lock); RETURN(0); } #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)); #else RETURN(-ENOSYS); #endif } int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld, struct list_head *cancels, int count) { #ifdef __KERNEL__ RETURN(ldlm_bl_to_thread(ns, ld, NULL, cancels, count)); #else RETURN(-ENOSYS); #endif } 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. */ if (req->rq_export == NULL) { struct ldlm_request *dlm_req; CDEBUG(D_RPCTRACE, "operation %d from %s with bad " "export cookie "LPX64"; this is " "normal if this node rebooted with a lock held\n", lustre_msg_get_opc(req->rq_reqmsg), libcfs_id2str(req->rq_peer), lustre_msg_get_handle(req->rq_reqmsg)->cookie); dlm_req = lustre_swab_reqbuf(req, DLM_LOCKREQ_OFF, sizeof(*dlm_req), lustre_swab_ldlm_request); if (dlm_req != NULL) CDEBUG(D_RPCTRACE, "--> lock cookie: "LPX64"\n", dlm_req->lock_handle[0].cookie); ldlm_callback_reply(req, -ENOTCONN); 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: OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0); break; case LDLM_CP_CALLBACK: OBD_FAIL_RETURN(OBD_FAIL_LDLM_CP_CALLBACK, 0); break; case LDLM_GL_CALLBACK: OBD_FAIL_RETURN(OBD_FAIL_LDLM_GL_CALLBACK, 0); break; case OBD_LOG_CANCEL: /* remove this eventually - for 1.4.0 compat */ OBD_FAIL_RETURN(OBD_FAIL_OBD_LOG_CANCEL_NET, 0); rc = llog_origin_handle_cancel(req); ldlm_callback_reply(req, rc); RETURN(0); case OBD_QC_CALLBACK: OBD_FAIL_RETURN(OBD_FAIL_OBD_QC_CALLBACK_NET, 0); rc = target_handle_qc_callback(req); ldlm_callback_reply(req, rc); RETURN(0); case QUOTA_DQACQ: case QUOTA_DQREL: /* reply in handler */ rc = target_handle_dqacq_callback(req); RETURN(0); case LLOG_ORIGIN_HANDLE_CREATE: OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0); rc = llog_origin_handle_create(req); ldlm_callback_reply(req, rc); RETURN(0); case LLOG_ORIGIN_HANDLE_NEXT_BLOCK: OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0); rc = llog_origin_handle_next_block(req); ldlm_callback_reply(req, rc); RETURN(0); case LLOG_ORIGIN_HANDLE_READ_HEADER: OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0); rc = llog_origin_handle_read_header(req); ldlm_callback_reply(req, rc); RETURN(0); case LLOG_ORIGIN_HANDLE_CLOSE: OBD_FAIL_RETURN(OBD_FAIL_OBD_LOGD_NET, 0); rc = llog_origin_handle_close(req); ldlm_callback_reply(req, rc); RETURN(0); case SEC_CTX_FINI: /* do nothing */ 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); dlm_req = lustre_swab_reqbuf(req, DLM_LOCKREQ_OFF, sizeof(*dlm_req), lustre_swab_ldlm_request); if (dlm_req == NULL) { CERROR ("can't unpack dlm_req\n"); ldlm_callback_reply(req, -EPROTO); RETURN (0); } lock = ldlm_handle2lock_ns(ns, &dlm_req->lock_handle[0]); if (!lock) { CDEBUG(D_DLMTRACE, "callback on lock "LPX64" - lock " "disappeared\n", dlm_req->lock_handle[0].cookie); ldlm_callback_reply(req, -EINVAL); RETURN(0); } /* 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 locks and cache is already droped, * 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)) { LDLM_DEBUG(lock, "callback on lock " LPX64" - lock disappeared\n", dlm_req->lock_handle[0].cookie); unlock_res_and_lock(lock); LDLM_LOCK_PUT(lock); ldlm_callback_reply(req, -EINVAL); RETURN(0); } 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"); if (!(lock->l_flags & LDLM_FL_CANCEL_ON_BLOCK)) ldlm_callback_reply(req, 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"); 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"); 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. */ if (req->rq_export == NULL) { struct ldlm_request *dlm_req; CERROR("operation %d from %s with bad export cookie "LPU64"\n", lustre_msg_get_opc(req->rq_reqmsg), libcfs_id2str(req->rq_peer), lustre_msg_get_handle(req->rq_reqmsg)->cookie); dlm_req = lustre_swab_reqbuf(req, DLM_LOCKREQ_OFF, sizeof(*dlm_req), lustre_swab_ldlm_request); 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: CDEBUG(D_INODE, "cancel\n"); OBD_FAIL_RETURN(OBD_FAIL_LDLM_CANCEL, 0); rc = ldlm_handle_cancel(req); if (rc) break; RETURN(0); case OBD_LOG_CANCEL: OBD_FAIL_RETURN(OBD_FAIL_OBD_LOG_CANCEL_NET, 0); rc = llog_origin_handle_cancel(req); ldlm_callback_reply(req, rc); RETURN(0); default: CERROR("invalid opcode %d\n", lustre_msg_get_opc(req->rq_reqmsg)); ldlm_callback_reply(req, -EINVAL); } RETURN(0); } void ldlm_revoke_export_locks(struct obd_export *exp) { struct list_head *locklist = &exp->exp_ldlm_data.led_held_locks; struct list_head rpc_list; struct ldlm_lock *lock, *next; struct ldlm_lock_desc desc; ENTRY; INIT_LIST_HEAD(&rpc_list); spin_lock(&exp->exp_ldlm_data.led_lock); list_for_each_entry_safe(lock, next, locklist, l_export_chain) { lock_res_and_lock(lock); if (lock->l_req_mode != lock->l_granted_mode) { unlock_res_and_lock(lock); continue; } LASSERT(lock->l_resource); if (lock->l_resource->lr_type != LDLM_IBITS && lock->l_resource->lr_type != LDLM_PLAIN) { unlock_res_and_lock(lock); continue; } if (lock->l_flags & LDLM_FL_AST_SENT) { unlock_res_and_lock(lock); continue; } LASSERT(lock->l_blocking_ast); LASSERT(!lock->l_blocking_lock); lock->l_flags |= LDLM_FL_AST_SENT; list_move(&lock->l_export_chain, &rpc_list); unlock_res_and_lock(lock); } spin_unlock(&exp->exp_ldlm_data.led_lock); while (!list_empty(&rpc_list)) { lock = list_entry(rpc_list.next, struct ldlm_lock, l_export_chain); list_del_init(&lock->l_export_chain); /* the desc just pretend to exclusive */ ldlm_lock2desc(lock, &desc); desc.l_req_mode = LCK_EX; desc.l_granted_mode = 0; LDLM_LOCK_GET(lock); lock->l_blocking_ast(lock, &desc, lock->l_ast_data, LDLM_CB_BLOCKING); LDLM_LOCK_PUT(lock); } 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; spin_lock(&blp->blp_lock); if (!list_empty(&blp->blp_list)) { blwi = list_entry(blp->blp_list.next, struct ldlm_bl_work_item, blwi_entry); list_del(&blwi->blwi_entry); } 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; struct completion 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; init_completion(&bltd.bltd_comp); rc = cfs_kernel_thread(ldlm_bl_thread_main, &bltd, 0); if (rc < 0) { CERROR("cannot start LDLM thread ldlm_bl_%02d: rc %d\n", atomic_read(&blp->blp_num_threads), rc); return rc; } 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 = atomic_inc_return(&blp->blp_num_threads) - 1; 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); 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; atomic_dec(&blp->blp_busy_threads); l_wait_event_exclusive(blp->blp_waitq, (blwi = ldlm_bl_get_work(blp)) != NULL, &lwi); busy = 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 >= atomic_read(&blp->blp_num_threads))) /* 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_count) { /* The special case when we cancel locks in lru * asynchronously, we pass the list of locks here. * Thus lock is marked LDLM_FL_CANCELING, and already * canceled locally. */ ldlm_cli_cancel_list(&blwi->blwi_head, blwi->blwi_count, NULL, 0, 0); } else { ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld, blwi->blwi_lock); } OBD_FREE(blwi, sizeof(*blwi)); } atomic_dec(&blp->blp_busy_threads); atomic_dec(&blp->blp_num_threads); complete(&blp->blp_comp); RETURN(0); } #endif static int ldlm_setup(void); static int ldlm_cleanup(int force); int ldlm_get_ref(void) { int rc = 0; ENTRY; mutex_down(&ldlm_ref_sem); if (++ldlm_refcount == 1) { rc = ldlm_setup(); if (rc) ldlm_refcount--; } mutex_up(&ldlm_ref_sem); RETURN(rc); } void ldlm_put_ref(int force) { ENTRY; mutex_down(&ldlm_ref_sem); if (ldlm_refcount == 1) { int rc = ldlm_cleanup(force); if (rc) CERROR("ldlm_cleanup failed: %d\n", rc); else ldlm_refcount--; } else { ldlm_refcount--; } mutex_up(&ldlm_ref_sem); EXIT; } 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, ldlm_timeout * 900, ldlm_callback_handler, "ldlm_cbd", ldlm_svc_proc_dir, NULL, ldlm_min_threads, ldlm_max_threads, "ldlm_cb", LCT_MD_THREAD|LCT_DT_THREAD); 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, ldlm_timeout * 6000, 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); 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; spin_lock_init(&blp->blp_lock); CFS_INIT_LIST_HEAD(&blp->blp_list); cfs_waitq_init(&blp->blp_waitq); atomic_set(&blp->blp_num_threads, 0); 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(NULL, ldlm_state->ldlm_cancel_service); if (rc) GOTO(out_thread, rc); rc = ptlrpc_start_threads(NULL, 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); spin_lock_init(&waiting_locks_spinlock); cfs_timer_init(&waiting_locks_timer, waiting_locks_callback, 0); rc = cfs_kernel_thread(expired_lock_main, NULL, CLONE_VM | CLONE_FILES); if (rc < 0) { CERROR("Cannot start ldlm expired-lock thread: %d\n", rc); GOTO(out_thread, rc); } 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(int force) { #ifdef __KERNEL__ struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool; #endif ENTRY; if (!list_empty(ldlm_namespace_list(LDLM_NAMESPACE_SERVER)) || !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 (atomic_read(&blp->blp_num_threads) > 0) { struct ldlm_bl_work_item blwi = { .blwi_ns = NULL }; init_completion(&blp->blp_comp); spin_lock(&blp->blp_lock); list_add_tail(&blwi.blwi_entry, &blp->blp_list); cfs_waitq_signal(&blp->blp_waitq); spin_unlock(&blp->blp_lock); 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); 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) { init_mutex(&ldlm_ref_sem); init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_SERVER)); init_mutex(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT)); ldlm_resource_slab = cfs_mem_cache_create("ldlm_resources", sizeof(struct ldlm_resource), 0, SLAB_HWCACHE_ALIGN); if (ldlm_resource_slab == NULL) return -ENOMEM; ldlm_lock_slab = cfs_mem_cache_create("ldlm_locks", sizeof(struct ldlm_lock), 0, SLAB_HWCACHE_ALIGN); if (ldlm_lock_slab == NULL) { cfs_mem_cache_destroy(ldlm_resource_slab); return -ENOMEM; } 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"); rc = cfs_mem_cache_destroy(ldlm_lock_slab); LASSERTF(rc == 0, "couldn't free ldlm lock 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_decref); EXPORT_SYMBOL(ldlm_lock_decref_and_cancel); EXPORT_SYMBOL(ldlm_lock_change_resource); EXPORT_SYMBOL(ldlm_lock_set_data); EXPORT_SYMBOL(ldlm_it2str); EXPORT_SYMBOL(ldlm_lock_dump); EXPORT_SYMBOL(ldlm_lock_dump_handle); EXPORT_SYMBOL(ldlm_cancel_locks_for_export); EXPORT_SYMBOL(ldlm_reprocess_all_ns); EXPORT_SYMBOL(ldlm_lock_allow_match); /* ldlm_request.c */ 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_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_cli_join_lru); EXPORT_SYMBOL(ldlm_replay_locks); EXPORT_SYMBOL(ldlm_resource_foreach); EXPORT_SYMBOL(ldlm_namespace_foreach); EXPORT_SYMBOL(ldlm_namespace_foreach_res); EXPORT_SYMBOL(ldlm_resource_iterate); EXPORT_SYMBOL(ldlm_cancel_resource_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(target_start_recovery_thread); 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);