diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/ldlm/ldlm_lockd.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/ldlm/ldlm_lockd.c | 1238 |
1 files changed, 1238 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_lockd.c b/drivers/staging/lustre/lustre/ldlm/ldlm_lockd.c new file mode 100644 index 000000000000..324d5e4286dc --- /dev/null +++ b/drivers/staging/lustre/lustre/ldlm/ldlm_lockd.c @@ -0,0 +1,1238 @@ +/* + * 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) 2010, 2012, Intel Corporation. + */ +/* + * 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 <braam@clusterfs.com> + * Author: Phil Schwan <phil@clusterfs.com> + */ + +#define DEBUG_SUBSYSTEM S_LDLM + +# include <linux/libcfs/libcfs.h> + +#include <lustre_dlm.h> +#include <obd_class.h> +#include <linux/list.h> +#include "ldlm_internal.h" + +static int ldlm_num_threads; +CFS_MODULE_PARM(ldlm_num_threads, "i", int, 0444, + "number of DLM service threads to start"); + +static char *ldlm_cpts; +CFS_MODULE_PARM(ldlm_cpts, "s", charp, 0444, + "CPU partitions ldlm threads should run on"); + +extern struct kmem_cache *ldlm_resource_slab; +extern struct kmem_cache *ldlm_lock_slab; +static struct mutex ldlm_ref_mutex; +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; +} + +#define ELT_STOPPED 0 +#define ELT_READY 1 +#define ELT_TERMINATE 2 + +struct ldlm_bl_pool { + 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 + */ + struct list_head blp_prio_list; + + /* + * blp_list is used for all other callbacks which are likely + * to take longer to process. + */ + struct list_head blp_list; + + wait_queue_head_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; + struct completion blwi_comp; + ldlm_cancel_flags_t blwi_flags; + int blwi_mem_pressure; +}; + + +int ldlm_del_waiting_lock(struct ldlm_lock *lock) +{ + RETURN(0); +} + +int ldlm_refresh_waiting_lock(struct ldlm_lock *lock, int timeout) +{ + RETURN(0); +} + + + +/** + * Callback handler for receiving incoming blocking ASTs. + * + * This can only happen on client side. + */ +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; +} + +/** + * Callback handler for receiving incoming completion ASTs. + * + * This only can happen on client side. + */ +static void ldlm_handle_cp_callback(struct ptlrpc_request *req, + struct ldlm_namespace *ns, + struct ldlm_request *dlm_req, + struct ldlm_lock *lock) +{ + int lvb_len; + LIST_HEAD(ast_list); + int rc = 0; + 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) { + schedule_timeout_and_set_state( + TASK_INTERRUPTIBLE, to); + if (lock->l_granted_mode == lock->l_req_mode || + lock->l_destroyed) + break; + } + } + + lvb_len = req_capsule_get_size(&req->rq_pill, &RMF_DLM_LVB, RCL_CLIENT); + if (lvb_len < 0) { + LDLM_ERROR(lock, "Fail to get lvb_len, rc = %d", lvb_len); + GOTO(out, rc = lvb_len); + } else if (lvb_len > 0) { + if (lock->l_lvb_len > 0) { + /* for extent lock, lvb contains ost_lvb{}. */ + LASSERT(lock->l_lvb_data != NULL); + + if (unlikely(lock->l_lvb_len < lvb_len)) { + LDLM_ERROR(lock, "Replied LVB is larger than " + "expectation, expected = %d, " + "replied = %d", + lock->l_lvb_len, lvb_len); + GOTO(out, rc = -EINVAL); + } + } else if (ldlm_has_layout(lock)) { /* for layout lock, lvb has + * variable length */ + void *lvb_data; + + OBD_ALLOC(lvb_data, lvb_len); + if (lvb_data == NULL) { + LDLM_ERROR(lock, "No memory: %d.\n", lvb_len); + GOTO(out, rc = -ENOMEM); + } + + lock_res_and_lock(lock); + LASSERT(lock->l_lvb_data == NULL); + lock->l_lvb_data = lvb_data; + lock->l_lvb_len = lvb_len; + unlock_res_and_lock(lock); + } + } + + 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"); + GOTO(out, rc = 0); + } + + /* 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(req->rq_export, + 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); + rc = ldlm_lock_change_resource(ns, lock, + &dlm_req->lock_desc.l_resource.lr_name); + if (rc < 0) { + LDLM_ERROR(lock, "Failed to allocate resource"); + GOTO(out, rc); + } + 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 > 0) { + rc = ldlm_fill_lvb(lock, &req->rq_pill, RCL_CLIENT, + lock->l_lvb_data, lvb_len); + if (rc < 0) { + unlock_res_and_lock(lock); + GOTO(out, rc); + } + } + + 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); + GOTO(out, rc); + +out: + if (rc < 0) { + lock_res_and_lock(lock); + lock->l_flags |= LDLM_FL_FAILED; + unlock_res_and_lock(lock); + wake_up(&lock->l_waitq); + } + LDLM_LOCK_RELEASE(lock); +} + +/** + * Callback handler for receiving incoming glimpse ASTs. + * + * This only can happen on client side. After handling the glimpse AST + * we also consider dropping the lock here if it is unused locally for a + * long time. + */ +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); +} + +static int __ldlm_bl_to_thread(struct ldlm_bl_work_item *blwi, + ldlm_cancel_flags_t cancel_flags) +{ + struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool; + ENTRY; + + 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 */ + list_add_tail(&blwi->blwi_entry, &blp->blp_prio_list); + } else { + /* other blocking callbacks are added to the regular list */ + list_add_tail(&blwi->blwi_entry, &blp->blp_list); + } + spin_unlock(&blp->blp_lock); + + wake_up(&blp->blp_waitq); + + /* can not check blwi->blwi_flags as blwi could be already freed in + LCF_ASYNC mode */ + if (!(cancel_flags & LCF_ASYNC)) + 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, + struct list_head *cancels, int count, + struct ldlm_lock *lock, + ldlm_cancel_flags_t cancel_flags) +{ + init_completion(&blwi->blwi_comp); + INIT_LIST_HEAD(&blwi->blwi_head); + + if (memory_pressure_get()) + blwi->blwi_mem_pressure = 1; + + blwi->blwi_ns = ns; + blwi->blwi_flags = cancel_flags; + 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; + } +} + +/** + * Queues a list of locks \a cancels containing \a count locks + * for later processing by a blocking thread. If \a count is zero, + * then the lock referenced as \a lock is queued instead. + * + * The blocking thread would then call ->l_blocking_ast callback in the lock. + * If list addition fails an error is returned and caller is supposed to + * call ->l_blocking_ast itself. + */ +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, + ldlm_cancel_flags_t cancel_flags) +{ + ENTRY; + + if (cancels && count == 0) + RETURN(0); + + if (cancel_flags & LCF_ASYNC) { + struct ldlm_bl_work_item *blwi; + + OBD_ALLOC(blwi, sizeof(*blwi)); + if (blwi == NULL) + RETURN(-ENOMEM); + init_blwi(blwi, ns, ld, cancels, count, lock, cancel_flags); + + RETURN(__ldlm_bl_to_thread(blwi, cancel_flags)); + } else { + /* 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, cancel_flags); + RETURN(__ldlm_bl_to_thread(&blwi, cancel_flags)); + } +} + + +int ldlm_bl_to_thread_lock(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld, + struct ldlm_lock *lock) +{ + return ldlm_bl_to_thread(ns, ld, lock, NULL, 0, LCF_ASYNC); +} + +int ldlm_bl_to_thread_list(struct ldlm_namespace *ns, struct ldlm_lock_desc *ld, + struct list_head *cancels, int count, + ldlm_cancel_flags_t cancel_flags) +{ + return ldlm_bl_to_thread(ns, ld, NULL, cancels, count, cancel_flags); +} + +/* 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_svc_thread->t_env, + 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"); +} + +static int ldlm_handle_qc_callback(struct ptlrpc_request *req) +{ + struct obd_quotactl *oqctl; + struct client_obd *cli = &req->rq_export->exp_obd->u.cli; + + oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL); + if (oqctl == NULL) { + CERROR("Can't unpack obd_quotactl\n"); + RETURN(-EPROTO); + } + + cli->cl_qchk_stat = oqctl->qc_stat; + return 0; +} + +/* 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_NET)) + RETURN(0); + break; + case LDLM_CP_CALLBACK: + if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_CP_CALLBACK_NET)) + RETURN(0); + break; + case LDLM_GL_CALLBACK: + if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_GL_CALLBACK_NET)) + 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 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_open(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); + 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 = ldlm_handle_qc_callback(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], 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 |= ldlm_flags_from_wire(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 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; + + spin_lock(&blp->blp_lock); + /* process a request from the blp_list at least every blp_num_threads */ + if (!list_empty(&blp->blp_list) && + (list_empty(&blp->blp_prio_list) || num_bl == 0)) + blwi = list_entry(blp->blp_list.next, + struct ldlm_bl_work_item, blwi_entry); + else + if (!list_empty(&blp->blp_prio_list)) + blwi = list_entry(blp->blp_prio_list.next, + struct ldlm_bl_work_item, + blwi_entry); + + if (blwi) { + if (++num_bl >= atomic_read(&blp->blp_num_threads)) + num_bl = 0; + 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 }; + task_t *task; + + init_completion(&bltd.bltd_comp); + bltd.bltd_num = atomic_read(&blp->blp_num_threads); + snprintf(bltd.bltd_name, sizeof(bltd.bltd_name) - 1, + "ldlm_bl_%02d", bltd.bltd_num); + task = kthread_run(ldlm_bl_thread_main, &bltd, bltd.bltd_name); + if (IS_ERR(task)) { + CERROR("cannot start LDLM thread ldlm_bl_%02d: rc %ld\n", + atomic_read(&blp->blp_num_threads), PTR_ERR(task)); + return PTR_ERR(task); + } + wait_for_completion(&bltd.bltd_comp); + + return 0; +} + +/** + * Main blocking requests processing thread. + * + * Callers put locks into its queue by calling ldlm_bl_to_thread. + * This thread in the end ends up doing actual call to ->l_blocking_ast + * for queued locks. + */ +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; + + atomic_inc(&blp->blp_num_threads); + atomic_inc(&blp->blp_busy_threads); + + 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; + int busy; + + blwi = ldlm_bl_get_work(blp); + + if (blwi == NULL) { + 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); + } else { + busy = atomic_read(&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) && + !blwi->blwi_mem_pressure)) + /* discard the return value, we tried */ + ldlm_bl_thread_start(blp); + + if (blwi->blwi_mem_pressure) + 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, + blwi->blwi_flags); + } else { + ldlm_handle_bl_callback(blwi->blwi_ns, &blwi->blwi_ld, + blwi->blwi_lock); + } + if (blwi->blwi_mem_pressure) + memory_pressure_clr(); + + if (blwi->blwi_flags & LCF_ASYNC) + OBD_FREE(blwi, sizeof(*blwi)); + else + complete(&blwi->blwi_comp); + } + + atomic_dec(&blp->blp_busy_threads); + atomic_dec(&blp->blp_num_threads); + complete(&blp->blp_comp); + RETURN(0); +} + + +static int ldlm_setup(void); +static int ldlm_cleanup(void); + +int ldlm_get_ref(void) +{ + int rc = 0; + ENTRY; + mutex_lock(&ldlm_ref_mutex); + if (++ldlm_refcount == 1) { + rc = ldlm_setup(); + if (rc) + ldlm_refcount--; + } + mutex_unlock(&ldlm_ref_mutex); + + RETURN(rc); +} +EXPORT_SYMBOL(ldlm_get_ref); + +void ldlm_put_ref(void) +{ + ENTRY; + mutex_lock(&ldlm_ref_mutex); + if (ldlm_refcount == 1) { + int rc = ldlm_cleanup(); + if (rc) + CERROR("ldlm_cleanup failed: %d\n", rc); + else + ldlm_refcount--; + } else { + ldlm_refcount--; + } + mutex_unlock(&ldlm_ref_mutex); + + EXIT; +} +EXPORT_SYMBOL(ldlm_put_ref); + +/* + * 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(struct hlist_node *hnode) +{ + struct ldlm_lock *lock; + + lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash); + return &lock->l_remote_handle; +} + +static void +ldlm_export_lock_keycpy(struct hlist_node *hnode, void *key) +{ + struct ldlm_lock *lock; + + lock = 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, struct hlist_node *hnode) +{ + return lustre_handle_equal(ldlm_export_lock_key(hnode), key); +} + +static void * +ldlm_export_lock_object(struct hlist_node *hnode) +{ + return hlist_entry(hnode, struct ldlm_lock, l_exp_hash); +} + +static void +ldlm_export_lock_get(cfs_hash_t *hs, struct hlist_node *hnode) +{ + struct ldlm_lock *lock; + + lock = hlist_entry(hnode, struct ldlm_lock, l_exp_hash); + LDLM_LOCK_GET(lock); +} + +static void +ldlm_export_lock_put(cfs_hash_t *hs, struct hlist_node *hnode) +{ + struct ldlm_lock *lock; + + lock = 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; + + ldlm_destroy_flock_export(exp); + EXIT; +} +EXPORT_SYMBOL(ldlm_destroy_export); + +static int ldlm_setup(void) +{ + static struct ptlrpc_service_conf conf; + struct ldlm_bl_pool *blp = NULL; + int rc = 0; + int i; + 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, rc); +#endif + + memset(&conf, 0, sizeof(conf)); + conf = (typeof(conf)) { + .psc_name = "ldlm_cbd", + .psc_watchdog_factor = 2, + .psc_buf = { + .bc_nbufs = LDLM_CLIENT_NBUFS, + .bc_buf_size = LDLM_BUFSIZE, + .bc_req_max_size = LDLM_MAXREQSIZE, + .bc_rep_max_size = LDLM_MAXREPSIZE, + .bc_req_portal = LDLM_CB_REQUEST_PORTAL, + .bc_rep_portal = LDLM_CB_REPLY_PORTAL, + }, + .psc_thr = { + .tc_thr_name = "ldlm_cb", + .tc_thr_factor = LDLM_THR_FACTOR, + .tc_nthrs_init = LDLM_NTHRS_INIT, + .tc_nthrs_base = LDLM_NTHRS_BASE, + .tc_nthrs_max = LDLM_NTHRS_MAX, + .tc_nthrs_user = ldlm_num_threads, + .tc_cpu_affinity = 1, + .tc_ctx_tags = LCT_MD_THREAD | LCT_DT_THREAD, + }, + .psc_cpt = { + .cc_pattern = ldlm_cpts, + }, + .psc_ops = { + .so_req_handler = ldlm_callback_handler, + }, + }; + ldlm_state->ldlm_cb_service = \ + ptlrpc_register_service(&conf, ldlm_svc_proc_dir); + if (IS_ERR(ldlm_state->ldlm_cb_service)) { + CERROR("failed to start service\n"); + rc = PTR_ERR(ldlm_state->ldlm_cb_service); + ldlm_state->ldlm_cb_service = NULL; + GOTO(out, rc); + } + + + OBD_ALLOC(blp, sizeof(*blp)); + if (blp == NULL) + GOTO(out, rc = -ENOMEM); + ldlm_state->ldlm_bl_pool = blp; + + spin_lock_init(&blp->blp_lock); + INIT_LIST_HEAD(&blp->blp_list); + INIT_LIST_HEAD(&blp->blp_prio_list); + init_waitqueue_head(&blp->blp_waitq); + atomic_set(&blp->blp_num_threads, 0); + atomic_set(&blp->blp_busy_threads, 0); + + if (ldlm_num_threads == 0) { + blp->blp_min_threads = LDLM_NTHRS_INIT; + blp->blp_max_threads = LDLM_NTHRS_MAX; + } else { + blp->blp_min_threads = blp->blp_max_threads = \ + min_t(int, LDLM_NTHRS_MAX, max_t(int, LDLM_NTHRS_INIT, + ldlm_num_threads)); + } + + for (i = 0; i < blp->blp_min_threads; i++) { + rc = ldlm_bl_thread_start(blp); + if (rc < 0) + GOTO(out, rc); + } + + + rc = ldlm_pools_init(); + if (rc) { + CERROR("Failed to initialize LDLM pools: %d\n", rc); + GOTO(out, rc); + } + RETURN(0); + + out: + ldlm_cleanup(); + RETURN(rc); +} + +static int ldlm_cleanup(void) +{ + 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); + } + + ldlm_pools_fini(); + + if (ldlm_state->ldlm_bl_pool != NULL) { + struct ldlm_bl_pool *blp = ldlm_state->ldlm_bl_pool; + + 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); + wake_up(&blp->blp_waitq); + spin_unlock(&blp->blp_lock); + + wait_for_completion(&blp->blp_comp); + } + + OBD_FREE(blp, sizeof(*blp)); + } + + if (ldlm_state->ldlm_cb_service != NULL) + ptlrpc_unregister_service(ldlm_state->ldlm_cb_service); + + ldlm_proc_cleanup(); + + + OBD_FREE(ldlm_state, sizeof(*ldlm_state)); + ldlm_state = NULL; + + RETURN(0); +} + +int ldlm_init(void) +{ + mutex_init(&ldlm_ref_mutex); + mutex_init(ldlm_namespace_lock(LDLM_NAMESPACE_SERVER)); + mutex_init(ldlm_namespace_lock(LDLM_NAMESPACE_CLIENT)); + ldlm_resource_slab = kmem_cache_create("ldlm_resources", + sizeof(struct ldlm_resource), 0, + SLAB_HWCACHE_ALIGN, NULL); + if (ldlm_resource_slab == NULL) + return -ENOMEM; + + ldlm_lock_slab = kmem_cache_create("ldlm_locks", + sizeof(struct ldlm_lock), 0, + SLAB_HWCACHE_ALIGN | SLAB_DESTROY_BY_RCU, NULL); + if (ldlm_lock_slab == NULL) { + kmem_cache_destroy(ldlm_resource_slab); + return -ENOMEM; + } + + ldlm_interval_slab = kmem_cache_create("interval_node", + sizeof(struct ldlm_interval), + 0, SLAB_HWCACHE_ALIGN, NULL); + if (ldlm_interval_slab == NULL) { + kmem_cache_destroy(ldlm_resource_slab); + kmem_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 ldlm_exit(void) +{ + if (ldlm_refcount) + CERROR("ldlm_refcount is %d in ldlm_exit!\n", ldlm_refcount); + kmem_cache_destroy(ldlm_resource_slab); + /* 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(); + kmem_cache_destroy(ldlm_lock_slab); + kmem_cache_destroy(ldlm_interval_slab); +} |