/* * 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) 2007, 2010, Oracle and/or its affiliates. All rights reserved. * Use is subject to license terms. * * Copyright (c) 2011, 2013, Intel Corporation. */ /* * This file is part of Lustre, http://www.lustre.org/ * Lustre is a trademark of Sun Microsystems, Inc. * * lustre/mgc/mgc_request.c * * Author: Nathan Rutman */ #define DEBUG_SUBSYSTEM S_MGC #define D_MGC D_CONFIG /*|D_WARNING*/ #include #include #include #include #include #include #include #include "mgc_internal.h" static int mgc_name2resid(char *name, int len, struct ldlm_res_id *res_id, int type) { __u64 resname = 0; if (len > sizeof(resname)) { CERROR("name too long: %s\n", name); return -EINVAL; } if (len <= 0) { CERROR("missing name: %s\n", name); return -EINVAL; } memcpy(&resname, name, len); /* Always use the same endianness for the resid */ memset(res_id, 0, sizeof(*res_id)); res_id->name[0] = cpu_to_le64(resname); /* XXX: unfortunately, sptlprc and config llog share one lock */ switch(type) { case CONFIG_T_CONFIG: case CONFIG_T_SPTLRPC: resname = 0; break; case CONFIG_T_RECOVER: case CONFIG_T_PARAMS: resname = type; break; default: LBUG(); } res_id->name[1] = cpu_to_le64(resname); CDEBUG(D_MGC, "log %s to resid "LPX64"/"LPX64" (%.8s)\n", name, res_id->name[0], res_id->name[1], (char *)&res_id->name[0]); return 0; } int mgc_fsname2resid(char *fsname, struct ldlm_res_id *res_id, int type) { /* fsname is at most 8 chars long, maybe contain "-". * e.g. "lustre", "SUN-000" */ return mgc_name2resid(fsname, strlen(fsname), res_id, type); } EXPORT_SYMBOL(mgc_fsname2resid); int mgc_logname2resid(char *logname, struct ldlm_res_id *res_id, int type) { char *name_end; int len; /* logname consists of "fsname-nodetype". * e.g. "lustre-MDT0001", "SUN-000-client" * there is an exception: llog "params" */ name_end = strrchr(logname, '-'); if (!name_end) len = strlen(logname); else len = name_end - logname; return mgc_name2resid(logname, len, res_id, type); } /********************** config llog list **********************/ static CFS_LIST_HEAD(config_llog_list); static DEFINE_SPINLOCK(config_list_lock); /* Take a reference to a config log */ static int config_log_get(struct config_llog_data *cld) { ENTRY; atomic_inc(&cld->cld_refcount); CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname, atomic_read(&cld->cld_refcount)); RETURN(0); } /* Drop a reference to a config log. When no longer referenced, we can free the config log data */ static void config_log_put(struct config_llog_data *cld) { ENTRY; CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname, atomic_read(&cld->cld_refcount)); LASSERT(atomic_read(&cld->cld_refcount) > 0); /* spinlock to make sure no item with 0 refcount in the list */ if (atomic_dec_and_lock(&cld->cld_refcount, &config_list_lock)) { cfs_list_del(&cld->cld_list_chain); spin_unlock(&config_list_lock); CDEBUG(D_MGC, "dropping config log %s\n", cld->cld_logname); if (cld->cld_recover) config_log_put(cld->cld_recover); if (cld->cld_sptlrpc) config_log_put(cld->cld_sptlrpc); if (cld->cld_params) config_log_put(cld->cld_params); if (cld_is_sptlrpc(cld)) sptlrpc_conf_log_stop(cld->cld_logname); class_export_put(cld->cld_mgcexp); OBD_FREE(cld, sizeof(*cld) + strlen(cld->cld_logname) + 1); } EXIT; } /* Find a config log by name */ static struct config_llog_data *config_log_find(char *logname, struct config_llog_instance *cfg) { struct config_llog_data *cld; struct config_llog_data *found = NULL; void * instance; ENTRY; LASSERT(logname != NULL); instance = cfg ? cfg->cfg_instance : NULL; spin_lock(&config_list_lock); cfs_list_for_each_entry(cld, &config_llog_list, cld_list_chain) { /* check if instance equals */ if (instance != cld->cld_cfg.cfg_instance) continue; /* instance may be NULL, should check name */ if (strcmp(logname, cld->cld_logname) == 0) { found = cld; break; } } if (found) { atomic_inc(&found->cld_refcount); LASSERT(found->cld_stopping == 0 || cld_is_sptlrpc(found) == 0); } spin_unlock(&config_list_lock); RETURN(found); } static struct config_llog_data *do_config_log_add(struct obd_device *obd, char *logname, int type, struct config_llog_instance *cfg, struct super_block *sb) { struct config_llog_data *cld; int rc; ENTRY; CDEBUG(D_MGC, "do adding config log %s:%p\n", logname, cfg ? cfg->cfg_instance : 0); OBD_ALLOC(cld, sizeof(*cld) + strlen(logname) + 1); if (!cld) RETURN(ERR_PTR(-ENOMEM)); strcpy(cld->cld_logname, logname); if (cfg) cld->cld_cfg = *cfg; else cld->cld_cfg.cfg_callback = class_config_llog_handler; mutex_init(&cld->cld_lock); cld->cld_cfg.cfg_last_idx = 0; cld->cld_cfg.cfg_flags = 0; cld->cld_cfg.cfg_sb = sb; cld->cld_type = type; atomic_set(&cld->cld_refcount, 1); /* Keep the mgc around until we are done */ cld->cld_mgcexp = class_export_get(obd->obd_self_export); if (cld_is_sptlrpc(cld)) { sptlrpc_conf_log_start(logname); cld->cld_cfg.cfg_obdname = obd->obd_name; } rc = mgc_logname2resid(logname, &cld->cld_resid, type); spin_lock(&config_list_lock); cfs_list_add(&cld->cld_list_chain, &config_llog_list); spin_unlock(&config_list_lock); if (rc) { config_log_put(cld); RETURN(ERR_PTR(rc)); } if (cld_is_sptlrpc(cld)) { rc = mgc_process_log(obd, cld); if (rc && rc != -ENOENT) CERROR("failed processing sptlrpc log: %d\n", rc); } RETURN(cld); } static struct config_llog_data *config_recover_log_add(struct obd_device *obd, char *fsname, struct config_llog_instance *cfg, struct super_block *sb) { struct config_llog_instance lcfg = *cfg; struct lustre_sb_info *lsi = s2lsi(sb); struct config_llog_data *cld; char logname[32]; if (IS_OST(lsi)) return NULL; /* for osp-on-ost, see lustre_start_osp() */ if (IS_MDT(lsi) && lcfg.cfg_instance) return NULL; /* we have to use different llog for clients and mdts for cmd * where only clients are notified if one of cmd server restarts */ LASSERT(strlen(fsname) < sizeof(logname) / 2); strcpy(logname, fsname); if (IS_SERVER(lsi)) { /* mdt */ LASSERT(lcfg.cfg_instance == NULL); lcfg.cfg_instance = sb; strcat(logname, "-mdtir"); } else { LASSERT(lcfg.cfg_instance != NULL); strcat(logname, "-cliir"); } cld = do_config_log_add(obd, logname, CONFIG_T_RECOVER, &lcfg, sb); return cld; } static struct config_llog_data *config_params_log_add(struct obd_device *obd, struct config_llog_instance *cfg, struct super_block *sb) { struct config_llog_instance lcfg = *cfg; struct config_llog_data *cld; lcfg.cfg_instance = sb; cld = do_config_log_add(obd, PARAMS_FILENAME, CONFIG_T_PARAMS, &lcfg, sb); return cld; } /** Add this log to the list of active logs watched by an MGC. * Active means we're watching for updates. * We have one active log per "mount" - client instance or servername. * Each instance may be at a different point in the log. */ static int config_log_add(struct obd_device *obd, char *logname, struct config_llog_instance *cfg, struct super_block *sb) { struct lustre_sb_info *lsi = s2lsi(sb); struct config_llog_data *cld; struct config_llog_data *sptlrpc_cld; struct config_llog_data *params_cld; char seclogname[32]; char *ptr; int rc; ENTRY; CDEBUG(D_MGC, "adding config log %s:%p\n", logname, cfg->cfg_instance); /* * for each regular log, the depended sptlrpc log name is * -sptlrpc. multiple regular logs may share one sptlrpc log. */ ptr = strrchr(logname, '-'); if (ptr == NULL || ptr - logname > 8) { CERROR("logname %s is too long\n", logname); RETURN(-EINVAL); } memcpy(seclogname, logname, ptr - logname); strcpy(seclogname + (ptr - logname), "-sptlrpc"); sptlrpc_cld = config_log_find(seclogname, NULL); if (sptlrpc_cld == NULL) { sptlrpc_cld = do_config_log_add(obd, seclogname, CONFIG_T_SPTLRPC, NULL, NULL); if (IS_ERR(sptlrpc_cld)) { CERROR("can't create sptlrpc log: %s\n", seclogname); GOTO(out_err, rc = PTR_ERR(sptlrpc_cld)); } } params_cld = config_params_log_add(obd, cfg, sb); if (IS_ERR(params_cld)) { rc = PTR_ERR(params_cld); CERROR("%s: can't create params log: rc = %d\n", obd->obd_name, rc); GOTO(out_err1, rc); } cld = do_config_log_add(obd, logname, CONFIG_T_CONFIG, cfg, sb); if (IS_ERR(cld)) { CERROR("can't create log: %s\n", logname); GOTO(out_err2, rc = PTR_ERR(cld)); } cld->cld_sptlrpc = sptlrpc_cld; cld->cld_params = params_cld; LASSERT(lsi->lsi_lmd); if (!(lsi->lsi_lmd->lmd_flags & LMD_FLG_NOIR)) { struct config_llog_data *recover_cld; ptr = strrchr(seclogname, '-'); if (ptr != NULL) { *ptr = 0; } else { CERROR("sptlrpc log name not correct: %s", seclogname); config_log_put(cld); RETURN(-EINVAL); } recover_cld = config_recover_log_add(obd, seclogname, cfg, sb); if (IS_ERR(recover_cld)) GOTO(out_err3, rc = PTR_ERR(recover_cld)); cld->cld_recover = recover_cld; } RETURN(0); out_err3: config_log_put(cld); out_err2: config_log_put(params_cld); out_err1: config_log_put(sptlrpc_cld); out_err: RETURN(rc); } DEFINE_MUTEX(llog_process_lock); /** Stop watching for updates on this log. */ static int config_log_end(char *logname, struct config_llog_instance *cfg) { struct config_llog_data *cld; struct config_llog_data *cld_sptlrpc = NULL; struct config_llog_data *cld_params = NULL; struct config_llog_data *cld_recover = NULL; int rc = 0; ENTRY; cld = config_log_find(logname, cfg); if (cld == NULL) RETURN(-ENOENT); mutex_lock(&cld->cld_lock); /* * if cld_stopping is set, it means we didn't start the log thus * not owning the start ref. this can happen after previous umount: * the cld still hanging there waiting for lock cancel, and we * remount again but failed in the middle and call log_end without * calling start_log. */ if (unlikely(cld->cld_stopping)) { mutex_unlock(&cld->cld_lock); /* drop the ref from the find */ config_log_put(cld); RETURN(rc); } cld->cld_stopping = 1; cld_recover = cld->cld_recover; cld->cld_recover = NULL; mutex_unlock(&cld->cld_lock); if (cld_recover) { mutex_lock(&cld_recover->cld_lock); cld_recover->cld_stopping = 1; mutex_unlock(&cld_recover->cld_lock); config_log_put(cld_recover); } spin_lock(&config_list_lock); cld_sptlrpc = cld->cld_sptlrpc; cld->cld_sptlrpc = NULL; cld_params = cld->cld_params; cld->cld_params = NULL; spin_unlock(&config_list_lock); if (cld_sptlrpc) config_log_put(cld_sptlrpc); if (cld_params) { mutex_lock(&cld_params->cld_lock); cld_params->cld_stopping = 1; mutex_unlock(&cld_params->cld_lock); config_log_put(cld_params); } /* drop the ref from the find */ config_log_put(cld); /* drop the start ref */ config_log_put(cld); CDEBUG(D_MGC, "end config log %s (%d)\n", logname ? logname : "client", rc); RETURN(rc); } #ifdef LPROCFS int lprocfs_mgc_rd_ir_state(struct seq_file *m, void *data) { struct obd_device *obd = data; struct obd_import *imp = obd->u.cli.cl_import; struct obd_connect_data *ocd = &imp->imp_connect_data; struct config_llog_data *cld; ENTRY; seq_printf(m, "imperative_recovery: %s\n", OCD_HAS_FLAG(ocd, IMP_RECOV) ? "ENABLED" : "DISABLED"); seq_printf(m, "client_state:\n"); spin_lock(&config_list_lock); cfs_list_for_each_entry(cld, &config_llog_list, cld_list_chain) { if (cld->cld_recover == NULL) continue; seq_printf(m, " - { client: %s, nidtbl_version: %u }\n", cld->cld_logname, cld->cld_recover->cld_cfg.cfg_last_idx); } spin_unlock(&config_list_lock); RETURN(0); } #endif /* reenqueue any lost locks */ #define RQ_RUNNING 0x1 #define RQ_NOW 0x2 #define RQ_LATER 0x4 #define RQ_STOP 0x8 static int rq_state = 0; static wait_queue_head_t rq_waitq; static DECLARE_COMPLETION(rq_exit); static void do_requeue(struct config_llog_data *cld) { int rc = 0; ENTRY; LASSERT(atomic_read(&cld->cld_refcount) > 0); /* Do not run mgc_process_log on a disconnected export or an * export which is being disconnected. Take the client * semaphore to make the check non-racy. */ down_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem); if (cld->cld_mgcexp->exp_obd->u.cli.cl_conn_count != 0) { CDEBUG(D_MGC, "updating log %s\n", cld->cld_logname); rc = mgc_process_log(cld->cld_mgcexp->exp_obd, cld); if (rc && rc != -ENOENT) CERROR("failed processing log: %d\n", rc); } else { CDEBUG(D_MGC, "disconnecting, won't update log %s\n", cld->cld_logname); } up_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem); EXIT; } /* this timeout represents how many seconds MGC should wait before * requeue config and recover lock to the MGS. We need to randomize this * in order to not flood the MGS. */ #define MGC_TIMEOUT_MIN_SECONDS 5 #define MGC_TIMEOUT_RAND_CENTISEC 0x1ff /* ~500 */ static int mgc_requeue_thread(void *data) { int rc = 0; ENTRY; CDEBUG(D_MGC, "Starting requeue thread\n"); /* Keep trying failed locks periodically */ spin_lock(&config_list_lock); rq_state |= RQ_RUNNING; while (1) { struct l_wait_info lwi; struct config_llog_data *cld, *cld_prev; int rand = cfs_rand() & MGC_TIMEOUT_RAND_CENTISEC; int stopped = !!(rq_state & RQ_STOP); int to; /* Any new or requeued lostlocks will change the state */ rq_state &= ~(RQ_NOW | RQ_LATER); spin_unlock(&config_list_lock); /* Always wait a few seconds to allow the server who caused the lock revocation to finish its setup, plus some random so everyone doesn't try to reconnect at once. */ to = MGC_TIMEOUT_MIN_SECONDS * HZ; to += rand * HZ / 100; /* rand is centi-seconds */ lwi = LWI_TIMEOUT(to, NULL, NULL); l_wait_event(rq_waitq, rq_state & RQ_STOP, &lwi); /* * iterate & processing through the list. for each cld, process * its depending sptlrpc cld firstly (if any) and then itself. * * it's guaranteed any item in the list must have * reference > 0; and if cld_lostlock is set, at * least one reference is taken by the previous enqueue. */ cld_prev = NULL; spin_lock(&config_list_lock); cfs_list_for_each_entry(cld, &config_llog_list, cld_list_chain) { if (!cld->cld_lostlock) continue; spin_unlock(&config_list_lock); LASSERT(atomic_read(&cld->cld_refcount) > 0); /* Whether we enqueued again or not in mgc_process_log, * we're done with the ref from the old enqueue */ if (cld_prev) config_log_put(cld_prev); cld_prev = cld; cld->cld_lostlock = 0; if (likely(!stopped)) do_requeue(cld); spin_lock(&config_list_lock); } spin_unlock(&config_list_lock); if (cld_prev) config_log_put(cld_prev); /* break after scanning the list so that we can drop * refcount to losing lock clds */ if (unlikely(stopped)) { spin_lock(&config_list_lock); break; } /* Wait a bit to see if anyone else needs a requeue */ lwi = (struct l_wait_info) { 0 }; l_wait_event(rq_waitq, rq_state & (RQ_NOW | RQ_STOP), &lwi); spin_lock(&config_list_lock); } /* spinlock and while guarantee RQ_NOW and RQ_LATER are not set */ rq_state &= ~RQ_RUNNING; spin_unlock(&config_list_lock); complete(&rq_exit); CDEBUG(D_MGC, "Ending requeue thread\n"); RETURN(rc); } /* Add a cld to the list to requeue. Start the requeue thread if needed. We are responsible for dropping the config log reference from here on out. */ static void mgc_requeue_add(struct config_llog_data *cld) { ENTRY; CDEBUG(D_INFO, "log %s: requeue (r=%d sp=%d st=%x)\n", cld->cld_logname, atomic_read(&cld->cld_refcount), cld->cld_stopping, rq_state); LASSERT(atomic_read(&cld->cld_refcount) > 0); mutex_lock(&cld->cld_lock); if (cld->cld_stopping || cld->cld_lostlock) { mutex_unlock(&cld->cld_lock); RETURN_EXIT; } /* this refcount will be released in mgc_requeue_thread. */ config_log_get(cld); cld->cld_lostlock = 1; mutex_unlock(&cld->cld_lock); /* Hold lock for rq_state */ spin_lock(&config_list_lock); if (rq_state & RQ_STOP) { spin_unlock(&config_list_lock); cld->cld_lostlock = 0; config_log_put(cld); } else { rq_state |= RQ_NOW; spin_unlock(&config_list_lock); wake_up(&rq_waitq); } EXIT; } /********************** class fns **********************/ static int mgc_local_llog_init(const struct lu_env *env, struct obd_device *obd, struct obd_device *disk) { struct llog_ctxt *ctxt; int rc; ENTRY; rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CONFIG_ORIG_CTXT, disk, &llog_osd_ops); if (rc) RETURN(rc); ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT); LASSERT(ctxt); ctxt->loc_dir = obd->u.cli.cl_mgc_configs_dir; llog_ctxt_put(ctxt); RETURN(0); } static int mgc_local_llog_fini(const struct lu_env *env, struct obd_device *obd) { struct llog_ctxt *ctxt; ENTRY; ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT); llog_cleanup(env, ctxt); RETURN(0); } static int mgc_fs_setup(struct obd_device *obd, struct super_block *sb) { struct lustre_sb_info *lsi = s2lsi(sb); struct client_obd *cli = &obd->u.cli; struct lu_fid rfid, fid; struct dt_object *root, *dto; struct lu_env *env; int rc = 0; ENTRY; LASSERT(lsi); LASSERT(lsi->lsi_dt_dev); OBD_ALLOC_PTR(env); if (env == NULL) RETURN(-ENOMEM); /* The mgc fs exclusion sem. Only one fs can be setup at a time. */ down(&cli->cl_mgc_sem); cfs_cleanup_group_info(); /* Setup the configs dir */ rc = lu_env_init(env, LCT_MG_THREAD); if (rc) GOTO(out_err, rc); fid.f_seq = FID_SEQ_LOCAL_NAME; fid.f_oid = 1; fid.f_ver = 0; rc = local_oid_storage_init(env, lsi->lsi_dt_dev, &fid, &cli->cl_mgc_los); if (rc) GOTO(out_env, rc); rc = dt_root_get(env, lsi->lsi_dt_dev, &rfid); if (rc) GOTO(out_env, rc); root = dt_locate_at(env, lsi->lsi_dt_dev, &rfid, &cli->cl_mgc_los->los_dev->dd_lu_dev, NULL); if (unlikely(IS_ERR(root))) GOTO(out_los, rc = PTR_ERR(root)); dto = local_file_find_or_create(env, cli->cl_mgc_los, root, MOUNT_CONFIGS_DIR, S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO); lu_object_put_nocache(env, &root->do_lu); if (IS_ERR(dto)) GOTO(out_los, rc = PTR_ERR(dto)); cli->cl_mgc_configs_dir = dto; LASSERT(lsi->lsi_osd_exp->exp_obd->obd_lvfs_ctxt.dt); rc = mgc_local_llog_init(env, obd, lsi->lsi_osd_exp->exp_obd); if (rc) GOTO(out_llog, rc); /* We take an obd ref to insure that we can't get to mgc_cleanup * without calling mgc_fs_cleanup first. */ class_incref(obd, "mgc_fs", obd); /* We keep the cl_mgc_sem until mgc_fs_cleanup */ EXIT; out_llog: if (rc) { lu_object_put(env, &cli->cl_mgc_configs_dir->do_lu); cli->cl_mgc_configs_dir = NULL; } out_los: if (rc < 0) { local_oid_storage_fini(env, cli->cl_mgc_los); cli->cl_mgc_los = NULL; up(&cli->cl_mgc_sem); } out_env: lu_env_fini(env); out_err: OBD_FREE_PTR(env); return rc; } static int mgc_fs_cleanup(struct obd_device *obd) { struct lu_env env; struct client_obd *cli = &obd->u.cli; int rc; ENTRY; LASSERT(cli->cl_mgc_los != NULL); rc = lu_env_init(&env, LCT_MG_THREAD); if (rc) GOTO(unlock, rc); mgc_local_llog_fini(&env, obd); lu_object_put_nocache(&env, &cli->cl_mgc_configs_dir->do_lu); cli->cl_mgc_configs_dir = NULL; local_oid_storage_fini(&env, cli->cl_mgc_los); cli->cl_mgc_los = NULL; lu_env_fini(&env); unlock: class_decref(obd, "mgc_fs", obd); up(&cli->cl_mgc_sem); RETURN(0); } static int mgc_llog_init(const struct lu_env *env, struct obd_device *obd) { struct llog_ctxt *ctxt; int rc; ENTRY; /* setup only remote ctxt, the local disk context is switched per each * filesystem during mgc_fs_setup() */ rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CONFIG_REPL_CTXT, obd, &llog_client_ops); if (rc) RETURN(rc); ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT); LASSERT(ctxt); llog_initiator_connect(ctxt); llog_ctxt_put(ctxt); RETURN(0); } static int mgc_llog_fini(const struct lu_env *env, struct obd_device *obd) { struct llog_ctxt *ctxt; ENTRY; ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT); if (ctxt) llog_cleanup(env, ctxt); RETURN(0); } static atomic_t mgc_count = ATOMIC_INIT(0); static int mgc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage) { int rc = 0; ENTRY; switch (stage) { case OBD_CLEANUP_EARLY: break; case OBD_CLEANUP_EXPORTS: if (atomic_dec_and_test(&mgc_count)) { int running; /* stop requeue thread */ spin_lock(&config_list_lock); running = rq_state & RQ_RUNNING; if (running) rq_state |= RQ_STOP; spin_unlock(&config_list_lock); if (running) { wake_up(&rq_waitq); wait_for_completion(&rq_exit); } } obd_cleanup_client_import(obd); rc = mgc_llog_fini(NULL, obd); if (rc != 0) CERROR("failed to cleanup llogging subsystems\n"); break; } RETURN(rc); } static int mgc_cleanup(struct obd_device *obd) { int rc; ENTRY; /* COMPAT_146 - old config logs may have added profiles we don't know about */ if (obd->obd_type->typ_refcnt <= 1) /* Only for the last mgc */ class_del_profiles(); lprocfs_obd_cleanup(obd); ptlrpcd_decref(); rc = client_obd_cleanup(obd); RETURN(rc); } static int mgc_setup(struct obd_device *obd, struct lustre_cfg *lcfg) { int rc; ENTRY; rc = ptlrpcd_addref(); if (rc < 0) RETURN(rc); rc = client_obd_setup(obd, lcfg); if (rc) GOTO(err_decref, rc); rc = mgc_llog_init(NULL, obd); if (rc) { CERROR("failed to setup llogging subsystems\n"); GOTO(err_cleanup, rc); } #ifdef LPROCFS obd->obd_vars = lprocfs_mgc_obd_vars; lprocfs_seq_obd_setup(obd); #endif sptlrpc_lprocfs_cliobd_attach(obd); if (atomic_inc_return(&mgc_count) == 1) { rq_state = 0; init_waitqueue_head(&rq_waitq); /* start requeue thread */ rc = PTR_ERR(kthread_run(mgc_requeue_thread, NULL, "ll_cfg_requeue")); if (IS_ERR_VALUE(rc)) { CERROR("%s: Cannot start requeue thread (%d)," "no more log updates!\n", obd->obd_name, rc); GOTO(err_cleanup, rc); } /* rc is the task_struct pointer of mgc_requeue_thread. */ rc = 0; } RETURN(rc); err_cleanup: client_obd_cleanup(obd); err_decref: ptlrpcd_decref(); RETURN(rc); } /* based on ll_mdc_blocking_ast */ static int mgc_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc, void *data, int flag) { struct lustre_handle lockh; struct config_llog_data *cld = (struct config_llog_data *)data; int rc = 0; ENTRY; switch (flag) { case LDLM_CB_BLOCKING: /* mgs wants the lock, give it up... */ LDLM_DEBUG(lock, "MGC blocking CB"); ldlm_lock2handle(lock, &lockh); rc = ldlm_cli_cancel(&lockh, LCF_ASYNC); break; case LDLM_CB_CANCELING: /* We've given up the lock, prepare ourselves to update. */ LDLM_DEBUG(lock, "MGC cancel CB"); CDEBUG(D_MGC, "Lock res "DLDLMRES" (%.8s)\n", PLDLMRES(lock->l_resource), (char *)&lock->l_resource->lr_name.name[0]); if (!cld) { CDEBUG(D_INFO, "missing data, won't requeue\n"); break; } /* held at mgc_process_log(). */ LASSERT(atomic_read(&cld->cld_refcount) > 0); /* Are we done with this log? */ if (cld->cld_stopping) { CDEBUG(D_MGC, "log %s: stopping, won't requeue\n", cld->cld_logname); config_log_put(cld); break; } /* Make sure not to re-enqueue when the mgc is stopping (we get called from client_disconnect_export) */ if (!lock->l_conn_export || !lock->l_conn_export->exp_obd->u.cli.cl_conn_count) { CDEBUG(D_MGC, "log %.8s: disconnecting, won't requeue\n", cld->cld_logname); config_log_put(cld); break; } /* Re-enqueue now */ mgc_requeue_add(cld); config_log_put(cld); break; default: LBUG(); } RETURN(rc); } /* Not sure where this should go... */ #define MGC_ENQUEUE_LIMIT 50 #define MGC_TARGET_REG_LIMIT 10 #define MGC_SEND_PARAM_LIMIT 10 /* Send parameter to MGS*/ static int mgc_set_mgs_param(struct obd_export *exp, struct mgs_send_param *msp) { struct ptlrpc_request *req; struct mgs_send_param *req_msp, *rep_msp; int rc; ENTRY; req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp), &RQF_MGS_SET_INFO, LUSTRE_MGS_VERSION, MGS_SET_INFO); if (!req) RETURN(-ENOMEM); req_msp = req_capsule_client_get(&req->rq_pill, &RMF_MGS_SEND_PARAM); if (!req_msp) { ptlrpc_req_finished(req); RETURN(-ENOMEM); } memcpy(req_msp, msp, sizeof(*req_msp)); ptlrpc_request_set_replen(req); /* Limit how long we will wait for the enqueue to complete */ req->rq_delay_limit = MGC_SEND_PARAM_LIMIT; rc = ptlrpc_queue_wait(req); if (!rc) { rep_msp = req_capsule_server_get(&req->rq_pill, &RMF_MGS_SEND_PARAM); memcpy(msp, rep_msp, sizeof(*rep_msp)); } ptlrpc_req_finished(req); RETURN(rc); } /* Take a config lock so we can get cancel notifications */ static int mgc_enqueue(struct obd_export *exp, struct lov_stripe_md *lsm, __u32 type, ldlm_policy_data_t *policy, __u32 mode, __u64 *flags, void *bl_cb, void *cp_cb, void *gl_cb, void *data, __u32 lvb_len, void *lvb_swabber, struct lustre_handle *lockh) { struct config_llog_data *cld = (struct config_llog_data *)data; struct ldlm_enqueue_info einfo = { .ei_type = type, .ei_mode = mode, .ei_cb_bl = mgc_blocking_ast, .ei_cb_cp = ldlm_completion_ast, }; struct ptlrpc_request *req; int short_limit = cld_is_sptlrpc(cld); int rc; ENTRY; CDEBUG(D_MGC, "Enqueue for %s (res "LPX64")\n", cld->cld_logname, cld->cld_resid.name[0]); /* We need a callback for every lockholder, so don't try to ldlm_lock_match (see rev 1.1.2.11.2.47) */ req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp), &RQF_LDLM_ENQUEUE, LUSTRE_DLM_VERSION, LDLM_ENQUEUE); if (req == NULL) RETURN(-ENOMEM); req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER, 0); ptlrpc_request_set_replen(req); /* check if this is server or client */ if (cld->cld_cfg.cfg_sb) { struct lustre_sb_info *lsi = s2lsi(cld->cld_cfg.cfg_sb); if (lsi && IS_SERVER(lsi)) short_limit = 1; } /* Limit how long we will wait for the enqueue to complete */ req->rq_delay_limit = short_limit ? 5 : MGC_ENQUEUE_LIMIT; rc = ldlm_cli_enqueue(exp, &req, &einfo, &cld->cld_resid, NULL, flags, NULL, 0, LVB_T_NONE, lockh, 0); /* A failed enqueue should still call the mgc_blocking_ast, where it will be requeued if needed ("grant failed"). */ ptlrpc_req_finished(req); RETURN(rc); } static int mgc_cancel(struct obd_export *exp, struct lov_stripe_md *md, __u32 mode, struct lustre_handle *lockh) { ENTRY; ldlm_lock_decref(lockh, mode); RETURN(0); } static void mgc_notify_active(struct obd_device *unused) { /* wakeup mgc_requeue_thread to requeue mgc lock */ spin_lock(&config_list_lock); rq_state |= RQ_NOW; spin_unlock(&config_list_lock); wake_up(&rq_waitq); /* TODO: Help the MGS rebuild nidtbl. -jay */ } /* Send target_reg message to MGS */ static int mgc_target_register(struct obd_export *exp, struct mgs_target_info *mti) { struct ptlrpc_request *req; struct mgs_target_info *req_mti, *rep_mti; int rc; ENTRY; req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp), &RQF_MGS_TARGET_REG, LUSTRE_MGS_VERSION, MGS_TARGET_REG); if (req == NULL) RETURN(-ENOMEM); req_mti = req_capsule_client_get(&req->rq_pill, &RMF_MGS_TARGET_INFO); if (!req_mti) { ptlrpc_req_finished(req); RETURN(-ENOMEM); } memcpy(req_mti, mti, sizeof(*req_mti)); ptlrpc_request_set_replen(req); CDEBUG(D_MGC, "register %s\n", mti->mti_svname); /* Limit how long we will wait for the enqueue to complete */ req->rq_delay_limit = MGC_TARGET_REG_LIMIT; rc = ptlrpc_queue_wait(req); if (!rc) { rep_mti = req_capsule_server_get(&req->rq_pill, &RMF_MGS_TARGET_INFO); memcpy(mti, rep_mti, sizeof(*rep_mti)); CDEBUG(D_MGC, "register %s got index = %d\n", mti->mti_svname, mti->mti_stripe_index); } ptlrpc_req_finished(req); RETURN(rc); } int mgc_set_info_async(const struct lu_env *env, struct obd_export *exp, obd_count keylen, void *key, obd_count vallen, void *val, struct ptlrpc_request_set *set) { int rc = -EINVAL; ENTRY; /* Turn off initial_recov after we try all backup servers once */ if (KEY_IS(KEY_INIT_RECOV_BACKUP)) { struct obd_import *imp = class_exp2cliimp(exp); int value; if (vallen != sizeof(int)) RETURN(-EINVAL); value = *(int *)val; CDEBUG(D_MGC, "InitRecov %s %d/d%d:i%d:r%d:or%d:%s\n", imp->imp_obd->obd_name, value, imp->imp_deactive, imp->imp_invalid, imp->imp_replayable, imp->imp_obd->obd_replayable, ptlrpc_import_state_name(imp->imp_state)); /* Resurrect if we previously died */ if ((imp->imp_state != LUSTRE_IMP_FULL && imp->imp_state != LUSTRE_IMP_NEW) || value > 1) ptlrpc_reconnect_import(imp); RETURN(0); } /* FIXME move this to mgc_process_config */ if (KEY_IS(KEY_REGISTER_TARGET)) { struct mgs_target_info *mti; if (vallen != sizeof(struct mgs_target_info)) RETURN(-EINVAL); mti = (struct mgs_target_info *)val; CDEBUG(D_MGC, "register_target %s %#x\n", mti->mti_svname, mti->mti_flags); rc = mgc_target_register(exp, mti); RETURN(rc); } if (KEY_IS(KEY_SET_FS)) { struct super_block *sb = (struct super_block *)val; if (vallen != sizeof(struct super_block)) RETURN(-EINVAL); rc = mgc_fs_setup(exp->exp_obd, sb); RETURN(rc); } if (KEY_IS(KEY_CLEAR_FS)) { if (vallen != 0) RETURN(-EINVAL); rc = mgc_fs_cleanup(exp->exp_obd); RETURN(rc); } if (KEY_IS(KEY_SET_INFO)) { struct mgs_send_param *msp; msp = (struct mgs_send_param *)val; rc = mgc_set_mgs_param(exp, msp); RETURN(rc); } if (KEY_IS(KEY_MGSSEC)) { struct client_obd *cli = &exp->exp_obd->u.cli; struct sptlrpc_flavor flvr; /* * empty string means using current flavor, if which haven't * been set yet, set it as null. * * if flavor has been set previously, check the asking flavor * must match the existing one. */ if (vallen == 0) { if (cli->cl_flvr_mgc.sf_rpc != SPTLRPC_FLVR_INVALID) RETURN(0); val = "null"; vallen = 4; } rc = sptlrpc_parse_flavor(val, &flvr); if (rc) { CERROR("invalid sptlrpc flavor %s to MGS\n", (char *) val); RETURN(rc); } /* * caller already hold a mutex */ if (cli->cl_flvr_mgc.sf_rpc == SPTLRPC_FLVR_INVALID) { cli->cl_flvr_mgc = flvr; } else if (memcmp(&cli->cl_flvr_mgc, &flvr, sizeof(flvr)) != 0) { char str[20]; sptlrpc_flavor2name(&cli->cl_flvr_mgc, str, sizeof(str)); LCONSOLE_ERROR("asking sptlrpc flavor %s to MGS but " "currently %s is in use\n", (char *) val, str); rc = -EPERM; } RETURN(rc); } RETURN(rc); } static int mgc_get_info(const struct lu_env *env, struct obd_export *exp, __u32 keylen, void *key, __u32 *vallen, void *val, struct lov_stripe_md *unused) { int rc = -EINVAL; if (KEY_IS(KEY_CONN_DATA)) { struct obd_import *imp = class_exp2cliimp(exp); struct obd_connect_data *data = val; if (*vallen == sizeof(*data)) { *data = imp->imp_connect_data; rc = 0; } } return rc; } static int mgc_import_event(struct obd_device *obd, struct obd_import *imp, enum obd_import_event event) { int rc = 0; LASSERT(imp->imp_obd == obd); CDEBUG(D_MGC, "import event %#x\n", event); switch (event) { case IMP_EVENT_DISCON: /* MGC imports should not wait for recovery */ if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV)) ptlrpc_pinger_ir_down(); break; case IMP_EVENT_INACTIVE: break; case IMP_EVENT_INVALIDATE: { struct ldlm_namespace *ns = obd->obd_namespace; ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY); break; } case IMP_EVENT_ACTIVE: CDEBUG(D_INFO, "%s: Reactivating import\n", obd->obd_name); /* Clearing obd_no_recov allows us to continue pinging */ obd->obd_no_recov = 0; mgc_notify_active(obd); if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV)) ptlrpc_pinger_ir_up(); break; case IMP_EVENT_OCD: break; case IMP_EVENT_DEACTIVATE: case IMP_EVENT_ACTIVATE: break; default: CERROR("Unknown import event %#x\n", event); LBUG(); } RETURN(rc); } enum { CONFIG_READ_NRPAGES_INIT = 1 << (20 - PAGE_CACHE_SHIFT), CONFIG_READ_NRPAGES = 4 }; static int mgc_apply_recover_logs(struct obd_device *mgc, struct config_llog_data *cld, __u64 max_version, void *data, int datalen, bool mne_swab) { struct config_llog_instance *cfg = &cld->cld_cfg; struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb); struct mgs_nidtbl_entry *entry; struct lustre_cfg *lcfg; struct lustre_cfg_bufs bufs; u64 prev_version = 0; char *inst; char *buf; int bufsz; int pos; int rc = 0; int off = 0; ENTRY; LASSERT(cfg->cfg_instance != NULL); LASSERT(cfg->cfg_sb == cfg->cfg_instance); OBD_ALLOC(inst, PAGE_CACHE_SIZE); if (inst == NULL) RETURN(-ENOMEM); if (!IS_SERVER(lsi)) { pos = snprintf(inst, PAGE_CACHE_SIZE, "%p", cfg->cfg_instance); if (pos >= PAGE_CACHE_SIZE) { OBD_FREE(inst, PAGE_CACHE_SIZE); return -E2BIG; } } else { LASSERT(IS_MDT(lsi)); rc = server_name2svname(lsi->lsi_svname, inst, NULL, PAGE_CACHE_SIZE); if (rc) { OBD_FREE(inst, PAGE_CACHE_SIZE); RETURN(-EINVAL); } pos = strlen(inst); } ++pos; buf = inst + pos; bufsz = PAGE_CACHE_SIZE - pos; while (datalen > 0) { int entry_len = sizeof(*entry); int is_ost; struct obd_device *obd; char *obdname; char *cname; char *params; char *uuid; rc = -EINVAL; if (datalen < sizeof(*entry)) break; entry = (typeof(entry))(data + off); /* sanity check */ if (entry->mne_nid_type != 0) /* only support type 0 for ipv4 */ break; if (entry->mne_nid_count == 0) /* at least one nid entry */ break; if (entry->mne_nid_size != sizeof(lnet_nid_t)) break; entry_len += entry->mne_nid_count * entry->mne_nid_size; if (datalen < entry_len) /* must have entry_len at least */ break; /* Keep this swab for normal mixed endian handling. LU-1644 */ if (mne_swab) lustre_swab_mgs_nidtbl_entry(entry); if (entry->mne_length > PAGE_CACHE_SIZE) { CERROR("MNE too large (%u)\n", entry->mne_length); break; } if (entry->mne_length < entry_len) break; off += entry->mne_length; datalen -= entry->mne_length; if (datalen < 0) break; if (entry->mne_version > max_version) { CERROR("entry index(%lld) is over max_index(%lld)\n", entry->mne_version, max_version); break; } if (prev_version >= entry->mne_version) { CERROR("index unsorted, prev %lld, now %lld\n", prev_version, entry->mne_version); break; } prev_version = entry->mne_version; /* * Write a string with format "nid::instance" to * lustre//--/import. */ is_ost = entry->mne_type == LDD_F_SV_TYPE_OST; memset(buf, 0, bufsz); obdname = buf; pos = 0; /* lustre-OST0001-osc- */ strcpy(obdname, cld->cld_logname); cname = strrchr(obdname, '-'); if (cname == NULL) { CERROR("mgc %s: invalid logname %s\n", mgc->obd_name, obdname); break; } pos = cname - obdname; obdname[pos] = 0; pos += sprintf(obdname + pos, "-%s%04x", is_ost ? "OST" : "MDT", entry->mne_index); cname = is_ost ? "osc" : "mdc", pos += sprintf(obdname + pos, "-%s-%s", cname, inst); lustre_cfg_bufs_reset(&bufs, obdname); /* find the obd by obdname */ obd = class_name2obd(obdname); if (obd == NULL) { CDEBUG(D_INFO, "mgc %s: cannot find obdname %s\n", mgc->obd_name, obdname); rc = 0; /* this is a safe race, when the ost is starting up...*/ continue; } /* osc.import = "connection=::" */ ++pos; params = buf + pos; pos += sprintf(params, "%s.import=%s", cname, "connection="); uuid = buf + pos; down_read(&obd->u.cli.cl_sem); if (obd->u.cli.cl_import == NULL) { /* client does not connect to the OST yet */ up_read(&obd->u.cli.cl_sem); rc = 0; continue; } /* TODO: iterate all nids to find one */ /* find uuid by nid */ rc = client_import_find_conn(obd->u.cli.cl_import, entry->u.nids[0], (struct obd_uuid *)uuid); up_read(&obd->u.cli.cl_sem); if (rc < 0) { CERROR("mgc: cannot find uuid by nid %s\n", libcfs_nid2str(entry->u.nids[0])); break; } CDEBUG(D_INFO, "Find uuid %s by nid %s\n", uuid, libcfs_nid2str(entry->u.nids[0])); pos += strlen(uuid); pos += sprintf(buf + pos, "::%u", entry->mne_instance); LASSERT(pos < bufsz); lustre_cfg_bufs_set_string(&bufs, 1, params); rc = -ENOMEM; lcfg = lustre_cfg_new(LCFG_PARAM, &bufs); if (lcfg == NULL) { CERROR("mgc: cannot allocate memory\n"); break; } CDEBUG(D_INFO, "ir apply logs "LPD64"/"LPD64" for %s -> %s\n", prev_version, max_version, obdname, params); rc = class_process_config(lcfg); lustre_cfg_free(lcfg); if (rc) CDEBUG(D_INFO, "process config for %s error %d\n", obdname, rc); /* continue, even one with error */ } OBD_FREE(inst, PAGE_CACHE_SIZE); RETURN(rc); } /** * This function is called if this client was notified for target restarting * by the MGS. A CONFIG_READ RPC is going to send to fetch recovery logs. */ static int mgc_process_recover_log(struct obd_device *obd, struct config_llog_data *cld) { struct ptlrpc_request *req = NULL; struct config_llog_instance *cfg = &cld->cld_cfg; struct mgs_config_body *body; struct mgs_config_res *res; struct ptlrpc_bulk_desc *desc; struct page **pages; int nrpages; bool eof = true; bool mne_swab = false; int i; int ealen; int rc; ENTRY; /* allocate buffer for bulk transfer. * if this is the first time for this mgs to read logs, * CONFIG_READ_NRPAGES_INIT will be used since it will read all logs * once; otherwise, it only reads increment of logs, this should be * small and CONFIG_READ_NRPAGES will be used. */ nrpages = CONFIG_READ_NRPAGES; if (cfg->cfg_last_idx == 0) /* the first time */ nrpages = CONFIG_READ_NRPAGES_INIT; OBD_ALLOC(pages, sizeof(*pages) * nrpages); if (pages == NULL) GOTO(out, rc = -ENOMEM); for (i = 0; i < nrpages; i++) { pages[i] = alloc_page(GFP_IOFS); if (pages[i] == NULL) GOTO(out, rc = -ENOMEM); } again: LASSERT(cld_is_recover(cld)); LASSERT(mutex_is_locked(&cld->cld_lock)); req = ptlrpc_request_alloc(class_exp2cliimp(cld->cld_mgcexp), &RQF_MGS_CONFIG_READ); if (req == NULL) GOTO(out, rc = -ENOMEM); rc = ptlrpc_request_pack(req, LUSTRE_MGS_VERSION, MGS_CONFIG_READ); if (rc) GOTO(out, rc); /* pack request */ body = req_capsule_client_get(&req->rq_pill, &RMF_MGS_CONFIG_BODY); LASSERT(body != NULL); LASSERT(sizeof(body->mcb_name) > strlen(cld->cld_logname)); if (strlcpy(body->mcb_name, cld->cld_logname, sizeof(body->mcb_name)) >= sizeof(body->mcb_name)) GOTO(out, rc = -E2BIG); body->mcb_offset = cfg->cfg_last_idx + 1; body->mcb_type = cld->cld_type; body->mcb_bits = PAGE_CACHE_SHIFT; body->mcb_units = nrpages; /* allocate bulk transfer descriptor */ desc = ptlrpc_prep_bulk_imp(req, nrpages, 1, BULK_PUT_SINK, MGS_BULK_PORTAL); if (desc == NULL) GOTO(out, rc = -ENOMEM); for (i = 0; i < nrpages; i++) ptlrpc_prep_bulk_page_pin(desc, pages[i], 0, PAGE_CACHE_SIZE); ptlrpc_request_set_replen(req); rc = ptlrpc_queue_wait(req); if (rc) GOTO(out, rc); res = req_capsule_server_get(&req->rq_pill, &RMF_MGS_CONFIG_RES); if (res->mcr_size < res->mcr_offset) GOTO(out, rc = -EINVAL); /* always update the index even though it might have errors with * handling the recover logs */ cfg->cfg_last_idx = res->mcr_offset; eof = res->mcr_offset == res->mcr_size; CDEBUG(D_INFO, "Latest version "LPD64", more %d.\n", res->mcr_offset, eof == false); ealen = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, 0); if (ealen < 0) GOTO(out, rc = ealen); if (ealen > nrpages << PAGE_CACHE_SHIFT) GOTO(out, rc = -EINVAL); if (ealen == 0) { /* no logs transferred */ if (!eof) rc = -EINVAL; GOTO(out, rc); } mne_swab = !!ptlrpc_rep_need_swab(req); #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 2, 50, 0) /* This import flag means the server did an extra swab of IR MNE * records (fixed in LU-1252), reverse it here if needed. LU-1644 */ if (unlikely(req->rq_import->imp_need_mne_swab)) mne_swab = !mne_swab; #else #warning "LU-1644: Remove old OBD_CONNECT_MNE_SWAB fixup and imp_need_mne_swab" #endif for (i = 0; i < nrpages && ealen > 0; i++) { int rc2; void *ptr; ptr = kmap(pages[i]); rc2 = mgc_apply_recover_logs(obd, cld, res->mcr_offset, ptr, min_t(int, ealen, PAGE_CACHE_SIZE), mne_swab); kunmap(pages[i]); if (rc2 < 0) { CWARN("Process recover log %s error %d\n", cld->cld_logname, rc2); break; } ealen -= PAGE_CACHE_SIZE; } out: if (req) ptlrpc_req_finished(req); if (rc == 0 && !eof) goto again; if (pages) { for (i = 0; i < nrpages; i++) { if (pages[i] == NULL) break; __free_page(pages[i]); } OBD_FREE(pages, sizeof(*pages) * nrpages); } return rc; } /* Copy a remote log locally */ static int mgc_llog_local_copy(const struct lu_env *env, struct obd_device *obd, struct llog_ctxt *rctxt, struct llog_ctxt *lctxt, char *logname) { char *temp_log; int rc; ENTRY; /* * - copy it to backup using llog_backup() * - copy remote llog to logname using llog_backup() * - if failed then move bakup to logname again */ OBD_ALLOC(temp_log, strlen(logname) + 1); if (!temp_log) RETURN(-ENOMEM); sprintf(temp_log, "%sT", logname); /* make a copy of local llog at first */ rc = llog_backup(env, obd, lctxt, lctxt, logname, temp_log); if (rc < 0 && rc != -ENOENT) GOTO(out, rc); /* copy remote llog to the local copy */ rc = llog_backup(env, obd, rctxt, lctxt, logname, logname); if (rc == -ENOENT) { /* no remote llog, delete local one too */ llog_erase(env, lctxt, NULL, logname); } else if (rc < 0) { /* error during backup, get local one back from the copy */ llog_backup(env, obd, lctxt, lctxt, temp_log, logname); out: CERROR("%s: failed to copy remote log %s: rc = %d\n", obd->obd_name, logname, rc); } llog_erase(env, lctxt, NULL, temp_log); OBD_FREE(temp_log, strlen(logname) + 1); return rc; } /* local_only means it cannot get remote llogs */ static int mgc_process_cfg_log(struct obd_device *mgc, struct config_llog_data *cld, int local_only) { struct llog_ctxt *ctxt, *lctxt = NULL; struct client_obd *cli = &mgc->u.cli; struct lustre_sb_info *lsi = NULL; int rc = 0; bool sptlrpc_started = false; struct lu_env *env; ENTRY; LASSERT(cld); LASSERT(mutex_is_locked(&cld->cld_lock)); /* * local copy of sptlrpc log is controlled elsewhere, don't try to * read it up here. */ if (cld_is_sptlrpc(cld) && local_only) RETURN(0); if (cld->cld_cfg.cfg_sb) lsi = s2lsi(cld->cld_cfg.cfg_sb); OBD_ALLOC_PTR(env); if (env == NULL) RETURN(-ENOMEM); rc = lu_env_init(env, LCT_MG_THREAD); if (rc) GOTO(out_free, rc); ctxt = llog_get_context(mgc, LLOG_CONFIG_REPL_CTXT); LASSERT(ctxt); lctxt = llog_get_context(mgc, LLOG_CONFIG_ORIG_CTXT); /* Copy the setup log locally if we can. Don't mess around if we're * running an MGS though (logs are already local). */ if (lctxt && lsi && IS_SERVER(lsi) && !IS_MGS(lsi) && cli->cl_mgc_configs_dir != NULL && lu2dt_dev(cli->cl_mgc_configs_dir->do_lu.lo_dev) == lsi->lsi_dt_dev) { if (!local_only) /* Only try to copy log if we have the lock. */ rc = mgc_llog_local_copy(env, mgc, ctxt, lctxt, cld->cld_logname); if (local_only || rc) { if (llog_is_empty(env, lctxt, cld->cld_logname)) { LCONSOLE_ERROR_MSG(0x13a, "Failed to get MGS " "log %s and no local copy." "\n", cld->cld_logname); GOTO(out_pop, rc = -ENOENT); } CDEBUG(D_MGC, "Failed to get MGS log %s, using local " "copy for now, will try to update later.\n", cld->cld_logname); } /* Now, whether we copied or not, start using the local llog. * If we failed to copy, we'll start using whatever the old * log has. */ llog_ctxt_put(ctxt); ctxt = lctxt; lctxt = NULL; } else { if (local_only) /* no local log at client side */ GOTO(out_pop, rc = -EIO); } if (cld_is_sptlrpc(cld)) { sptlrpc_conf_log_update_begin(cld->cld_logname); sptlrpc_started = true; } /* logname and instance info should be the same, so use our * copy of the instance for the update. The cfg_last_idx will * be updated here. */ rc = class_config_parse_llog(env, ctxt, cld->cld_logname, &cld->cld_cfg); EXIT; out_pop: __llog_ctxt_put(env, ctxt); if (lctxt) __llog_ctxt_put(env, lctxt); /* * update settings on existing OBDs. doing it inside * of llog_process_lock so no device is attaching/detaching * in parallel. * the logname must be -sptlrpc */ if (sptlrpc_started) { LASSERT(cld_is_sptlrpc(cld)); sptlrpc_conf_log_update_end(cld->cld_logname); class_notify_sptlrpc_conf(cld->cld_logname, strlen(cld->cld_logname) - strlen("-sptlrpc")); } lu_env_fini(env); out_free: OBD_FREE_PTR(env); return rc; } /** Get a config log from the MGS and process it. * This func is called for both clients and servers. * Copy the log locally before parsing it if appropriate (non-MGS server) */ int mgc_process_log(struct obd_device *mgc, struct config_llog_data *cld) { struct lustre_handle lockh = { 0 }; __u64 flags = LDLM_FL_NO_LRU; int rc = 0, rcl; ENTRY; LASSERT(cld); /* I don't want multiple processes running process_log at once -- sounds like badness. It actually might be fine, as long as we're not trying to update from the same log simultaneously (in which case we should use a per-log sem.) */ mutex_lock(&cld->cld_lock); if (cld->cld_stopping) { mutex_unlock(&cld->cld_lock); RETURN(0); } OBD_FAIL_TIMEOUT(OBD_FAIL_MGC_PAUSE_PROCESS_LOG, 20); CDEBUG(D_MGC, "Process log %s:%p from %d\n", cld->cld_logname, cld->cld_cfg.cfg_instance, cld->cld_cfg.cfg_last_idx + 1); /* Get the cfg lock on the llog */ rcl = mgc_enqueue(mgc->u.cli.cl_mgc_mgsexp, NULL, LDLM_PLAIN, NULL, LCK_CR, &flags, NULL, NULL, NULL, cld, 0, NULL, &lockh); if (rcl == 0) { /* Get the cld, it will be released in mgc_blocking_ast. */ config_log_get(cld); rc = ldlm_lock_set_data(&lockh, (void *)cld); LASSERT(rc == 0); } else { CDEBUG(D_MGC, "Can't get cfg lock: %d\n", rcl); /* mark cld_lostlock so that it will requeue * after MGC becomes available. */ cld->cld_lostlock = 1; /* Get extra reference, it will be put in requeue thread */ config_log_get(cld); } if (cld_is_recover(cld)) { rc = 0; /* this is not a fatal error for recover log */ if (rcl == 0) rc = mgc_process_recover_log(mgc, cld); } else { rc = mgc_process_cfg_log(mgc, cld, rcl != 0); } CDEBUG(D_MGC, "%s: configuration from log '%s' %sed (%d).\n", mgc->obd_name, cld->cld_logname, rc ? "fail" : "succeed", rc); mutex_unlock(&cld->cld_lock); /* Now drop the lock so MGS can revoke it */ if (!rcl) { rcl = mgc_cancel(mgc->u.cli.cl_mgc_mgsexp, NULL, LCK_CR, &lockh); if (rcl) CERROR("Can't drop cfg lock: %d\n", rcl); } RETURN(rc); } /** Called from lustre_process_log. * LCFG_LOG_START gets the config log from the MGS, processes it to start * any services, and adds it to the list logs to watch (follow). */ static int mgc_process_config(struct obd_device *obd, obd_count len, void *buf) { struct lustre_cfg *lcfg = buf; struct config_llog_instance *cfg = NULL; char *logname; int rc = 0; ENTRY; switch(lcfg->lcfg_command) { case LCFG_LOV_ADD_OBD: { /* Overloading this cfg command: register a new target */ struct mgs_target_info *mti; if (LUSTRE_CFG_BUFLEN(lcfg, 1) != sizeof(struct mgs_target_info)) GOTO(out, rc = -EINVAL); mti = (struct mgs_target_info *)lustre_cfg_buf(lcfg, 1); CDEBUG(D_MGC, "add_target %s %#x\n", mti->mti_svname, mti->mti_flags); rc = mgc_target_register(obd->u.cli.cl_mgc_mgsexp, mti); break; } case LCFG_LOV_DEL_OBD: /* Unregister has no meaning at the moment. */ CERROR("lov_del_obd unimplemented\n"); rc = -ENOSYS; break; case LCFG_SPTLRPC_CONF: { rc = sptlrpc_process_config(lcfg); break; } case LCFG_LOG_START: { struct config_llog_data *cld; struct super_block *sb; logname = lustre_cfg_string(lcfg, 1); cfg = (struct config_llog_instance *)lustre_cfg_buf(lcfg, 2); sb = *(struct super_block **)lustre_cfg_buf(lcfg, 3); CDEBUG(D_MGC, "parse_log %s from %d\n", logname, cfg->cfg_last_idx); /* We're only called through here on the initial mount */ rc = config_log_add(obd, logname, cfg, sb); if (rc) break; cld = config_log_find(logname, cfg); if (cld == NULL) { rc = -ENOENT; break; } /* COMPAT_146 */ /* FIXME only set this for old logs! Right now this forces us to always skip the "inside markers" check */ cld->cld_cfg.cfg_flags |= CFG_F_COMPAT146; rc = mgc_process_log(obd, cld); if (rc == 0 && cld->cld_recover != NULL) { if (OCD_HAS_FLAG(&obd->u.cli.cl_import-> imp_connect_data, IMP_RECOV)) { rc = mgc_process_log(obd, cld->cld_recover); } else { struct config_llog_data *cir = cld->cld_recover; cld->cld_recover = NULL; config_log_put(cir); } if (rc) CERROR("Cannot process recover llog %d\n", rc); } if (rc == 0 && cld->cld_params != NULL) { rc = mgc_process_log(obd, cld->cld_params); if (rc == -ENOENT) { CDEBUG(D_MGC, "There is no params" "config file yet\n"); rc = 0; } /* params log is optional */ if (rc) CERROR("%s: can't process params llog: rc = %d\n", obd->obd_name, rc); } config_log_put(cld); break; } case LCFG_LOG_END: { logname = lustre_cfg_string(lcfg, 1); if (lcfg->lcfg_bufcount >= 2) cfg = (struct config_llog_instance *)lustre_cfg_buf( lcfg, 2); rc = config_log_end(logname, cfg); break; } default: { CERROR("Unknown command: %d\n", lcfg->lcfg_command); GOTO(out, rc = -EINVAL); } } out: RETURN(rc); } struct obd_ops mgc_obd_ops = { .o_owner = THIS_MODULE, .o_setup = mgc_setup, .o_precleanup = mgc_precleanup, .o_cleanup = mgc_cleanup, .o_add_conn = client_import_add_conn, .o_del_conn = client_import_del_conn, .o_connect = client_connect_import, .o_disconnect = client_disconnect_export, //.o_enqueue = mgc_enqueue, .o_cancel = mgc_cancel, //.o_iocontrol = mgc_iocontrol, .o_set_info_async = mgc_set_info_async, .o_get_info = mgc_get_info, .o_import_event = mgc_import_event, .o_process_config = mgc_process_config, }; int __init mgc_init(void) { return class_register_type(&mgc_obd_ops, NULL, NULL, #ifndef HAVE_ONLY_PROCFS_SEQ NULL, #endif LUSTRE_MGC_NAME, NULL); } #ifdef __KERNEL__ static void /*__exit*/ mgc_exit(void) { class_unregister_type(LUSTRE_MGC_NAME); } MODULE_AUTHOR("Sun Microsystems, Inc. "); MODULE_DESCRIPTION("Lustre Management Client"); MODULE_LICENSE("GPL"); module_init(mgc_init); module_exit(mgc_exit); #endif