X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=lustre%2Fptlrpc%2Fptlrpcd.c;h=78c054606ebb8c41ccd49589c24afb1f910568dc;hb=9ab78a5bec154492c70f780706d9eaebeaaa5e54;hp=b2c06be65f2a4f64e00fc2184e2b86bbf61b4f24;hpb=6c509e0b4bffd7b612f318ef79f9bf7085905f32;p=fs%2Flustre-release.git diff --git a/lustre/ptlrpc/ptlrpcd.c b/lustre/ptlrpc/ptlrpcd.c index b2c06be..78c0546 100644 --- a/lustre/ptlrpc/ptlrpcd.c +++ b/lustre/ptlrpc/ptlrpcd.c @@ -1,27 +1,56 @@ /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * - * Copyright (C) 2001-2003 Cluster File Systems, Inc. - * Author Peter Braam + * GPL HEADER START * - * This file is part of the Lustre file system, http://www.lustre.org - * Lustre is a trademark of Cluster File Systems, Inc. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * - * 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. + * 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. * - * 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. + * 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). * - * 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. + * 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) 2003, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + */ +/* + * This file is part of Lustre, http://www.lustre.org/ + * Lustre is a trademark of Sun Microsystems, Inc. + * + * lustre/ptlrpc/ptlrpcd.c + */ + +/** \defgroup ptlrpcd PortalRPC daemon + * + * ptlrpcd is a special thread with its own set where other user might add + * requests when they don't want to wait for their completion. + * PtlRPCD will take care of sending such requests and then processing their + * replies and calling completion callbacks as necessary. + * The callbacks are called directly from ptlrpcd context. + * It is important to never significantly block (esp. on RPCs!) within such + * completion handler or a deadlock might occur where ptlrpcd enters some + * callback that attempts to send another RPC and wait for it to return, + * during which time ptlrpcd is completely blocked, so e.g. if import + * fails, recovery cannot progress because connection requests are also + * sent by ptlrpcd. + * + * @{ */ #define DEBUG_SUBSYSTEM S_RPC @@ -33,35 +62,52 @@ # include #endif -#include #include # include #include #include /* for obd_zombie */ #include /* for OBD_FAIL_CHECK */ +#include /* cl_env_{get,put}() */ #include -#define LIOD_STOP 0 -struct ptlrpcd_ctl { - unsigned long pc_flags; - spinlock_t pc_lock; - struct completion pc_starting; - struct completion pc_finishing; - struct ptlrpc_request_set *pc_set; - char pc_name[16]; -#ifndef __KERNEL__ - int pc_recurred; - void *pc_callback; - void *pc_wait_callback; - void *pc_idle_callback; -#endif +enum pscope_thread { + PT_NORMAL, + PT_RECOVERY, + PT_NR +}; + +struct ptlrpcd_scope_ctl { + struct ptlrpcd_thread { + const char *pt_name; + struct ptlrpcd_ctl pt_ctl; + } pscope_thread[PT_NR]; }; -static struct ptlrpcd_ctl ptlrpcd_pc; -static struct ptlrpcd_ctl ptlrpcd_recovery_pc; +static struct ptlrpcd_scope_ctl ptlrpcd_scopes[PSCOPE_NR] = { + [PSCOPE_BRW] = { + .pscope_thread = { + [PT_NORMAL] = { + .pt_name = "ptlrpcd-brw" + }, + [PT_RECOVERY] = { + .pt_name = "ptlrpcd-brw-rcv" + } + } + }, + [PSCOPE_OTHER] = { + .pscope_thread = { + [PT_NORMAL] = { + .pt_name = "ptlrpcd" + }, + [PT_RECOVERY] = { + .pt_name = "ptlrpcd-rcv" + } + } + } +}; -struct semaphore ptlrpcd_sem; +cfs_semaphore_t ptlrpcd_sem; static int ptlrpcd_users = 0; void ptlrpcd_wake(struct ptlrpc_request *req) @@ -73,125 +119,274 @@ void ptlrpcd_wake(struct ptlrpc_request *req) cfs_waitq_signal(&rq_set->set_waitq); } -/* requests that are added to the ptlrpcd queue are sent via - * ptlrpcd_check->ptlrpc_check_set() */ -void ptlrpcd_add_req(struct ptlrpc_request *req) +/** + * Move all request from an existing request set to the ptlrpcd queue. + * All requests from the set must be in phase RQ_PHASE_NEW. + */ +void ptlrpcd_add_rqset(struct ptlrpc_request_set *set) +{ + cfs_list_t *tmp, *pos; + + cfs_list_for_each_safe(pos, tmp, &set->set_requests) { + struct ptlrpc_request *req = + cfs_list_entry(pos, struct ptlrpc_request, + rq_set_chain); + + LASSERT(req->rq_phase == RQ_PHASE_NEW); + cfs_list_del_init(&req->rq_set_chain); + req->rq_set = NULL; + ptlrpcd_add_req(req, PSCOPE_OTHER); + cfs_atomic_dec(&set->set_remaining); + } + LASSERT(cfs_atomic_read(&set->set_remaining) == 0); +} +EXPORT_SYMBOL(ptlrpcd_add_rqset); + +/** + * Requests that are added to the ptlrpcd queue are sent via + * ptlrpcd_check->ptlrpc_check_set(). + */ +int ptlrpcd_add_req(struct ptlrpc_request *req, enum ptlrpcd_scope scope) { struct ptlrpcd_ctl *pc; + enum pscope_thread pt; + int rc; - if (req->rq_send_state == LUSTRE_IMP_FULL) - pc = &ptlrpcd_pc; - else - pc = &ptlrpcd_recovery_pc; + LASSERT(scope < PSCOPE_NR); + + cfs_spin_lock(&req->rq_lock); + if (req->rq_invalid_rqset) { + cfs_duration_t timeout; + struct l_wait_info lwi; - ptlrpc_set_add_new_req(pc->pc_set, req); - cfs_waitq_signal(&pc->pc_set->set_waitq); + req->rq_invalid_rqset = 0; + cfs_spin_unlock(&req->rq_lock); + + timeout = cfs_time_seconds(5); + lwi = LWI_TIMEOUT(timeout, back_to_sleep, NULL); + l_wait_event(req->rq_set_waitq, (req->rq_set == NULL), &lwi); + } else if (req->rq_set) { + LASSERT(req->rq_phase == RQ_PHASE_NEW); + LASSERT(req->rq_send_state == LUSTRE_IMP_REPLAY); + + /* ptlrpc_check_set will decrease the count */ + cfs_atomic_inc(&req->rq_set->set_remaining); + cfs_spin_unlock(&req->rq_lock); + + cfs_waitq_signal(&req->rq_set->set_waitq); + } else { + cfs_spin_unlock(&req->rq_lock); + } + + pt = req->rq_send_state == LUSTRE_IMP_FULL ? PT_NORMAL : PT_RECOVERY; + pc = &ptlrpcd_scopes[scope].pscope_thread[pt].pt_ctl; + rc = ptlrpc_set_add_new_req(pc, req); + /* + * XXX disable this for CLIO: environment is needed for interpreter. + * add debug temporary to check rc. + */ + LASSERTF(rc == 0, "ptlrpcd_add_req failed (rc = %d)\n", rc); + if (rc && 0) { + /* + * Thread is probably in stop now so we need to + * kill this rpc as it was not added. Let's call + * interpret for it to let know we're killing it + * so that higher levels might free associated + * resources. + */ + ptlrpc_req_interpret(NULL, req, -EBADR); + req->rq_set = NULL; + ptlrpc_req_finished(req); + } else if (req->rq_send_state == LUSTRE_IMP_CONNECTING) { + /* + * The request is for recovery, should be sent ASAP. + */ + cfs_waitq_signal(&pc->pc_set->set_waitq); + } + + return rc; } -static int ptlrpcd_check(struct ptlrpcd_ctl *pc) +/** + * Check if there is more work to do on ptlrpcd set. + * Returns 1 if yes. + */ +static int ptlrpcd_check(const struct lu_env *env, struct ptlrpcd_ctl *pc) { - struct list_head *tmp, *pos; + cfs_list_t *tmp, *pos; struct ptlrpc_request *req; int rc = 0; ENTRY; - if (test_bit(LIOD_STOP, &pc->pc_flags)) - RETURN(1); - - spin_lock(&pc->pc_set->set_new_req_lock); - list_for_each_safe(pos, tmp, &pc->pc_set->set_new_requests) { - req = list_entry(pos, struct ptlrpc_request, rq_set_chain); - list_del_init(&req->rq_set_chain); + cfs_spin_lock(&pc->pc_set->set_new_req_lock); + cfs_list_for_each_safe(pos, tmp, &pc->pc_set->set_new_requests) { + req = cfs_list_entry(pos, struct ptlrpc_request, rq_set_chain); + cfs_list_del_init(&req->rq_set_chain); ptlrpc_set_add_req(pc->pc_set, req); - rc = 1; /* need to calculate its timeout */ + /* + * Need to calculate its timeout. + */ + rc = 1; } - spin_unlock(&pc->pc_set->set_new_req_lock); + cfs_spin_unlock(&pc->pc_set->set_new_req_lock); - if (pc->pc_set->set_remaining) { - rc = rc | ptlrpc_check_set(pc->pc_set); + if (cfs_atomic_read(&pc->pc_set->set_remaining)) { + rc = rc | ptlrpc_check_set(env, pc->pc_set); - /* XXX our set never completes, so we prune the completed - * reqs after each iteration. boy could this be smarter. */ - list_for_each_safe(pos, tmp, &pc->pc_set->set_requests) { - req = list_entry(pos, struct ptlrpc_request, + /* + * XXX: our set never completes, so we prune the completed + * reqs after each iteration. boy could this be smarter. + */ + cfs_list_for_each_safe(pos, tmp, &pc->pc_set->set_requests) { + req = cfs_list_entry(pos, struct ptlrpc_request, rq_set_chain); if (req->rq_phase != RQ_PHASE_COMPLETE) continue; - list_del_init(&req->rq_set_chain); + cfs_list_del_init(&req->rq_set_chain); req->rq_set = NULL; ptlrpc_req_finished (req); } } if (rc == 0) { - /* If new requests have been added, make sure to wake up */ - spin_lock(&pc->pc_set->set_new_req_lock); - rc = !list_empty(&pc->pc_set->set_new_requests); - spin_unlock(&pc->pc_set->set_new_req_lock); + /* + * If new requests have been added, make sure to wake up. + */ + cfs_spin_lock(&pc->pc_set->set_new_req_lock); + rc = !cfs_list_empty(&pc->pc_set->set_new_requests); + cfs_spin_unlock(&pc->pc_set->set_new_req_lock); } RETURN(rc); } #ifdef __KERNEL__ -/* ptlrpc's code paths like to execute in process context, so we have this - * thread which spins on a set which contains the io rpcs. llite specifies - * ptlrpcd's set when it pushes pages down into the oscs */ +/** + * Main ptlrpcd thread. + * ptlrpc's code paths like to execute in process context, so we have this + * thread which spins on a set which contains the rpcs and sends them. + * + */ static int ptlrpcd(void *arg) { struct ptlrpcd_ctl *pc = arg; - int rc; + struct lu_env env = { .le_ses = NULL }; + int rc, exit = 0; ENTRY; - if ((rc = cfs_daemonize_ctxt(pc->pc_name))) { - complete(&pc->pc_starting); - return rc; + rc = cfs_daemonize_ctxt(pc->pc_name); + if (rc == 0) { + /* + * XXX So far only "client" ptlrpcd uses an environment. In + * the future, ptlrpcd thread (or a thread-set) has to given + * an argument, describing its "scope". + */ + rc = lu_context_init(&env.le_ctx, + LCT_CL_THREAD|LCT_REMEMBER|LCT_NOREF); } - complete(&pc->pc_starting); + cfs_complete(&pc->pc_starting); - /* this mainloop strongly resembles ptlrpc_set_wait except - * that our set never completes. ptlrpcd_check calls ptlrpc_check_set - * when there are requests in the set. new requests come in - * on the set's new_req_list and ptlrpcd_check moves them into - * the set. */ - while (1) { + if (rc != 0) + RETURN(rc); + env.le_ctx.lc_cookie = 0x7; + + /* + * This mainloop strongly resembles ptlrpc_set_wait() except that our + * set never completes. ptlrpcd_check() calls ptlrpc_check_set() when + * there are requests in the set. New requests come in on the set's + * new_req_list and ptlrpcd_check() moves them into the set. + */ + do { struct l_wait_info lwi; - cfs_duration_t timeout; + int timeout; + + rc = lu_env_refill(&env); + if (rc != 0) { + /* + * XXX This is very awkward situation, because + * execution can neither continue (request + * interpreters assume that env is set up), nor repeat + * the loop (as this potentially results in a tight + * loop of -ENOMEM's). + * + * Fortunately, refill only ever does something when + * new modules are loaded, i.e., early during boot up. + */ + CERROR("Failure to refill session: %d\n", rc); + continue; + } - timeout = cfs_time_seconds(ptlrpc_set_next_timeout(pc->pc_set)); - lwi = LWI_TIMEOUT(timeout, ptlrpc_expired_set, pc->pc_set); + timeout = ptlrpc_set_next_timeout(pc->pc_set); + lwi = LWI_TIMEOUT(cfs_time_seconds(timeout ? timeout : 1), + ptlrpc_expired_set, pc->pc_set); + + lu_context_enter(&env.le_ctx); + l_wait_event(pc->pc_set->set_waitq, + ptlrpcd_check(&env, pc), &lwi); + lu_context_exit(&env.le_ctx); + + /* + * Abort inflight rpcs for forced stop case. + */ + if (cfs_test_bit(LIOD_STOP, &pc->pc_flags)) { + if (cfs_test_bit(LIOD_FORCE, &pc->pc_flags)) + ptlrpc_abort_set(pc->pc_set); + exit++; + } - l_wait_event(pc->pc_set->set_waitq, ptlrpcd_check(pc), &lwi); + /* + * Let's make one more loop to make sure that ptlrpcd_check() + * copied all raced new rpcs into the set so we can kill them. + */ + } while (exit < 2); - if (test_bit(LIOD_STOP, &pc->pc_flags)) - break; - } - /* wait for inflight requests to drain */ - if (!list_empty(&pc->pc_set->set_requests)) + /* + * Wait for inflight requests to drain. + */ + if (!cfs_list_empty(&pc->pc_set->set_requests)) ptlrpc_set_wait(pc->pc_set); - complete(&pc->pc_finishing); + lu_context_fini(&env.le_ctx); + cfs_complete(&pc->pc_finishing); + + cfs_clear_bit(LIOD_START, &pc->pc_flags); + cfs_clear_bit(LIOD_STOP, &pc->pc_flags); + cfs_clear_bit(LIOD_FORCE, &pc->pc_flags); return 0; } -#else +#else /* !__KERNEL__ */ +/** + * In liblustre we do not have separate threads, so this function + * is called from time to time all across common code to see + * if something needs to be processed on ptlrpcd set. + */ int ptlrpcd_check_async_rpcs(void *arg) { struct ptlrpcd_ctl *pc = arg; - int rc = 0; + int rc = 0; - /* single threaded!! */ + /* + * Single threaded!! + */ pc->pc_recurred++; if (pc->pc_recurred == 1) { - rc = ptlrpcd_check(pc); - if (!rc) - ptlrpc_expired_set(pc->pc_set); - /*XXX send replay requests */ - if (pc == &ptlrpcd_recovery_pc) - rc = ptlrpcd_check(pc); + rc = lu_env_refill(&pc->pc_env); + if (rc == 0) { + lu_context_enter(&pc->pc_env.le_ctx); + rc = ptlrpcd_check(&pc->pc_env, pc); + lu_context_exit(&pc->pc_env.le_ctx); + if (!rc) + ptlrpc_expired_set(pc->pc_set); + /* + * XXX: send replay requests. + */ + if (cfs_test_bit(LIOD_RECOVERY, &pc->pc_flags)) + rc = ptlrpcd_check(&pc->pc_env, pc); + } } pc->pc_recurred--; @@ -202,36 +397,53 @@ int ptlrpcd_idle(void *arg) { struct ptlrpcd_ctl *pc = arg; - return (list_empty(&pc->pc_set->set_new_requests) && - pc->pc_set->set_remaining == 0); + return (cfs_list_empty(&pc->pc_set->set_new_requests) && + cfs_atomic_read(&pc->pc_set->set_remaining) == 0); } #endif -static int ptlrpcd_start(char *name, struct ptlrpcd_ctl *pc) +int ptlrpcd_start(const char *name, struct ptlrpcd_ctl *pc) { int rc; - ENTRY; - memset(pc, 0, sizeof(*pc)); - init_completion(&pc->pc_starting); - init_completion(&pc->pc_finishing); - pc->pc_flags = 0; - spin_lock_init(&pc->pc_lock); - snprintf (pc->pc_name, sizeof (pc->pc_name), name); + /* + * Do not allow start second thread for one pc. + */ + if (cfs_test_and_set_bit(LIOD_START, &pc->pc_flags)) { + CERROR("Starting second thread (%s) for same pc %p\n", + name, pc); + RETURN(-EALREADY); + } + + cfs_init_completion(&pc->pc_starting); + cfs_init_completion(&pc->pc_finishing); + cfs_spin_lock_init(&pc->pc_lock); + strncpy(pc->pc_name, name, sizeof(pc->pc_name) - 1); pc->pc_set = ptlrpc_prep_set(); if (pc->pc_set == NULL) - RETURN(-ENOMEM); + GOTO(out, rc = -ENOMEM); + /* + * So far only "client" ptlrpcd uses an environment. In the future, + * ptlrpcd thread (or a thread-set) has to be given an argument, + * describing its "scope". + */ + rc = lu_context_init(&pc->pc_env.le_ctx, LCT_CL_THREAD|LCT_REMEMBER); + if (rc != 0) { + ptlrpc_set_destroy(pc->pc_set); + GOTO(out, rc); + } #ifdef __KERNEL__ rc = cfs_kernel_thread(ptlrpcd, pc, 0); if (rc < 0) { + lu_context_fini(&pc->pc_env.le_ctx); ptlrpc_set_destroy(pc->pc_set); - RETURN(rc); + GOTO(out, rc); } - - wait_for_completion(&pc->pc_starting); + rc = 0; + cfs_wait_for_completion(&pc->pc_starting); #else pc->pc_wait_callback = liblustre_register_wait_callback("ptlrpcd_check_async_rpcs", @@ -239,56 +451,89 @@ static int ptlrpcd_start(char *name, struct ptlrpcd_ctl *pc) pc->pc_idle_callback = liblustre_register_idle_callback("ptlrpcd_check_idle_rpcs", &ptlrpcd_idle, pc); - (void)rc; #endif - RETURN(0); +out: + if (rc) + cfs_clear_bit(LIOD_START, &pc->pc_flags); + RETURN(rc); } -static void ptlrpcd_stop(struct ptlrpcd_ctl *pc) +void ptlrpcd_stop(struct ptlrpcd_ctl *pc, int force) { - set_bit(LIOD_STOP, &pc->pc_flags); + if (!cfs_test_bit(LIOD_START, &pc->pc_flags)) { + CERROR("Thread for pc %p was not started\n", pc); + return; + } + + cfs_set_bit(LIOD_STOP, &pc->pc_flags); + if (force) + cfs_set_bit(LIOD_FORCE, &pc->pc_flags); cfs_waitq_signal(&pc->pc_set->set_waitq); #ifdef __KERNEL__ - wait_for_completion(&pc->pc_finishing); + cfs_wait_for_completion(&pc->pc_finishing); #else liblustre_deregister_wait_callback(pc->pc_wait_callback); liblustre_deregister_idle_callback(pc->pc_idle_callback); #endif + lu_context_fini(&pc->pc_env.le_ctx); ptlrpc_set_destroy(pc->pc_set); } -int ptlrpcd_addref(void) +void ptlrpcd_fini(void) { - int rc = 0; + int i; + int j; + ENTRY; - mutex_down(&ptlrpcd_sem); - if (++ptlrpcd_users != 1) - GOTO(out, rc); + for (i = 0; i < PSCOPE_NR; ++i) { + for (j = 0; j < PT_NR; ++j) { + struct ptlrpcd_ctl *pc; - rc = ptlrpcd_start("ptlrpcd", &ptlrpcd_pc); - if (rc) { - --ptlrpcd_users; - GOTO(out, rc); + pc = &ptlrpcd_scopes[i].pscope_thread[j].pt_ctl; + + if (cfs_test_bit(LIOD_START, &pc->pc_flags)) + ptlrpcd_stop(pc, 0); + } } + EXIT; +} - rc = ptlrpcd_start("ptlrpcd-recov", &ptlrpcd_recovery_pc); - if (rc) { - ptlrpcd_stop(&ptlrpcd_pc); - --ptlrpcd_users; - GOTO(out, rc); +int ptlrpcd_addref(void) +{ + int rc = 0; + int i; + int j; + ENTRY; + + cfs_mutex_down(&ptlrpcd_sem); + if (++ptlrpcd_users == 1) { + for (i = 0; rc == 0 && i < PSCOPE_NR; ++i) { + for (j = 0; rc == 0 && j < PT_NR; ++j) { + struct ptlrpcd_thread *pt; + struct ptlrpcd_ctl *pc; + + pt = &ptlrpcd_scopes[i].pscope_thread[j]; + pc = &pt->pt_ctl; + if (j == PT_RECOVERY) + cfs_set_bit(LIOD_RECOVERY, &pc->pc_flags); + rc = ptlrpcd_start(pt->pt_name, pc); + } + } + if (rc != 0) { + --ptlrpcd_users; + ptlrpcd_fini(); + } } -out: - mutex_up(&ptlrpcd_sem); + cfs_mutex_up(&ptlrpcd_sem); RETURN(rc); } void ptlrpcd_decref(void) { - mutex_down(&ptlrpcd_sem); - if (--ptlrpcd_users == 0) { - ptlrpcd_stop(&ptlrpcd_pc); - ptlrpcd_stop(&ptlrpcd_recovery_pc); - } - mutex_up(&ptlrpcd_sem); + cfs_mutex_down(&ptlrpcd_sem); + if (--ptlrpcd_users == 0) + ptlrpcd_fini(); + cfs_mutex_up(&ptlrpcd_sem); } +/** @} ptlrpcd */