diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/mgc/mgc_request.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/mgc/mgc_request.c | 1860 |
1 files changed, 1860 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/mgc/mgc_request.c b/drivers/staging/lustre/lustre/mgc/mgc_request.c new file mode 100644 index 000000000000..c6c84d97ce4e --- /dev/null +++ b/drivers/staging/lustre/lustre/mgc/mgc_request.c @@ -0,0 +1,1860 @@ +/* + * 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, 2012, 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 <nathan@clusterfs.com> + */ + +#define DEBUG_SUBSYSTEM S_MGC +#define D_MGC D_CONFIG /*|D_WARNING*/ + +# include <linux/module.h> +# include <linux/pagemap.h> +# include <linux/miscdevice.h> +# include <linux/init.h> + +#include <obd_class.h> +#include <lustre_dlm.h> +#include <lprocfs_status.h> +#include <lustre_log.h> +#include <lustre_fsfilt.h> +#include <lustre_disk.h> +#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 > 8) { + 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: + 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" */ + name_end = strrchr(logname, '-'); + LASSERT(name_end); + len = name_end - logname; + return mgc_name2resid(logname, len, res_id, type); +} + +/********************** config llog list **********************/ +static 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)) { + 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_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); + 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); + 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; +} + + +/** 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; + char seclogname[32]; + char *ptr; + ENTRY; + + CDEBUG(D_MGC, "adding config log %s:%p\n", logname, cfg->cfg_instance); + + /* + * for each regular log, the depended sptlrpc log name is + * <fsname>-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); + RETURN(PTR_ERR(sptlrpc_cld)); + } + } + + cld = do_config_log_add(obd, logname, CONFIG_T_CONFIG, cfg, sb); + if (IS_ERR(cld)) { + CERROR("can't create log: %s\n", logname); + config_log_put(sptlrpc_cld); + RETURN(PTR_ERR(cld)); + } + + cld->cld_sptlrpc = sptlrpc_cld; + + LASSERT(lsi->lsi_lmd); + if (!(lsi->lsi_lmd->lmd_flags & LMD_FLG_NOIR)) { + struct config_llog_data *recover_cld; + *strrchr(seclogname, '-') = 0; + recover_cld = config_recover_log_add(obd, seclogname, cfg, sb); + if (IS_ERR(recover_cld)) { + config_log_put(cld); + RETURN(PTR_ERR(recover_cld)); + } + cld->cld_recover = recover_cld; + } + + RETURN(0); +} + +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_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; + spin_unlock(&config_list_lock); + + if (cld_sptlrpc) + config_log_put(cld_sptlrpc); + + /* 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); +} + +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); + 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); +} + +/* 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) +{ + 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); + mgc_process_log(cld->cld_mgcexp->exp_obd, cld); + } 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); + 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_fs_setup(struct obd_device *obd, struct super_block *sb, + struct vfsmount *mnt) +{ + struct lvfs_run_ctxt saved; + struct lustre_sb_info *lsi = s2lsi(sb); + struct client_obd *cli = &obd->u.cli; + struct dentry *dentry; + char *label; + int err = 0; + ENTRY; + + LASSERT(lsi); + LASSERT(lsi->lsi_srv_mnt == mnt); + + /* The mgc fs exclusion sem. Only one fs can be setup at a time. */ + down(&cli->cl_mgc_sem); + + cfs_cleanup_group_info(); + + obd->obd_fsops = fsfilt_get_ops(lsi->lsi_fstype); + if (IS_ERR(obd->obd_fsops)) { + up(&cli->cl_mgc_sem); + CERROR("%s: No fstype %s: rc = %ld\n", lsi->lsi_fstype, + obd->obd_name, PTR_ERR(obd->obd_fsops)); + RETURN(PTR_ERR(obd->obd_fsops)); + } + + cli->cl_mgc_vfsmnt = mnt; + err = fsfilt_setup(obd, mnt->mnt_sb); + if (err) + GOTO(err_ops, err); + + OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt); + obd->obd_lvfs_ctxt.pwdmnt = mnt; + obd->obd_lvfs_ctxt.pwd = mnt->mnt_root; + obd->obd_lvfs_ctxt.fs = get_ds(); + + push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL); + dentry = ll_lookup_one_len(MOUNT_CONFIGS_DIR, cfs_fs_pwd(current->fs), + strlen(MOUNT_CONFIGS_DIR)); + pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL); + if (IS_ERR(dentry)) { + err = PTR_ERR(dentry); + CERROR("cannot lookup %s directory: rc = %d\n", + MOUNT_CONFIGS_DIR, err); + GOTO(err_ops, err); + } + cli->cl_mgc_configs_dir = dentry; + + /* 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); + + label = fsfilt_get_label(obd, mnt->mnt_sb); + if (label) + CDEBUG(D_MGC, "MGC using disk labelled=%s\n", label); + + /* We keep the cl_mgc_sem until mgc_fs_cleanup */ + RETURN(0); + +err_ops: + fsfilt_put_ops(obd->obd_fsops); + obd->obd_fsops = NULL; + cli->cl_mgc_vfsmnt = NULL; + up(&cli->cl_mgc_sem); + RETURN(err); +} + +static int mgc_fs_cleanup(struct obd_device *obd) +{ + struct client_obd *cli = &obd->u.cli; + int rc = 0; + ENTRY; + + LASSERT(cli->cl_mgc_vfsmnt != NULL); + + if (cli->cl_mgc_configs_dir != NULL) { + struct lvfs_run_ctxt saved; + push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL); + l_dput(cli->cl_mgc_configs_dir); + cli->cl_mgc_configs_dir = NULL; + pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL); + class_decref(obd, "mgc_fs", obd); + } + + cli->cl_mgc_vfsmnt = NULL; + if (obd->obd_fsops) + fsfilt_put_ops(obd->obd_fsops); + + up(&cli->cl_mgc_sem); + + RETURN(rc); +} + +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 = obd_llog_finish(obd, 0); + if (rc != 0) + CERROR("failed to cleanup llogging subsystems\n"); + break; + } + RETURN(rc); +} + +static int mgc_cleanup(struct obd_device *obd) +{ + struct client_obd *cli = &obd->u.cli; + int rc; + ENTRY; + + LASSERT(cli->cl_mgc_vfsmnt == NULL); + + /* 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) +{ + struct lprocfs_static_vars lvars; + int rc; + ENTRY; + + ptlrpcd_addref(); + + rc = client_obd_setup(obd, lcfg); + if (rc) + GOTO(err_decref, rc); + + rc = obd_llog_init(obd, &obd->obd_olg, obd, NULL); + if (rc) { + CERROR("failed to setup llogging subsystems\n"); + GOTO(err_cleanup, rc); + } + + lprocfs_mgc_init_vars(&lvars); + lprocfs_obd_setup(obd, lvars.obd_vars); + 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 "LPX64" (%.8s)\n", + lock->l_resource->lr_name.name[0], + (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 = { type, mode, mgc_blocking_ast, + ldlm_completion_ast, NULL, NULL, NULL }; + 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; + struct lustre_sb_info *lsi; + if (vallen != sizeof(struct super_block)) + RETURN(-EINVAL); + lsi = s2lsi(sb); + rc = mgc_fs_setup(exp->exp_obd, sb, lsi->lsi_srv_mnt); + if (rc) { + CERROR("set_fs got %d\n", rc); + } + RETURN(rc); + } + if (KEY_IS(KEY_CLEAR_FS)) { + if (vallen != 0) + RETURN(-EINVAL); + rc = mgc_fs_cleanup(exp->exp_obd); + if (rc) { + CERROR("clear_fs got %d\n", rc); + } + 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); +} + +static int mgc_llog_init(struct obd_device *obd, struct obd_llog_group *olg, + struct obd_device *tgt, int *index) +{ + struct llog_ctxt *ctxt; + int rc; + ENTRY; + + LASSERT(olg == &obd->obd_olg); + + + rc = llog_setup(NULL, obd, olg, LLOG_CONFIG_REPL_CTXT, tgt, + &llog_client_ops); + if (rc) + GOTO(out, rc); + + ctxt = llog_group_get_ctxt(olg, LLOG_CONFIG_REPL_CTXT); + if (!ctxt) + GOTO(out, rc = -ENODEV); + + llog_initiator_connect(ctxt); + llog_ctxt_put(ctxt); + + RETURN(0); +out: + ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT); + if (ctxt) + llog_cleanup(NULL, ctxt); + RETURN(rc); +} + +static int mgc_llog_finish(struct obd_device *obd, int count) +{ + struct llog_ctxt *ctxt; + + ENTRY; + + ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT); + if (ctxt) + llog_cleanup(NULL, ctxt); + + ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT); + if (ctxt) + llog_cleanup(NULL, ctxt); + RETURN(0); +} + +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/<osc|mdc>/<target>-<osc|mdc>-<instance>/import. + */ + + is_ost = entry->mne_type == LDD_F_SV_TYPE_OST; + memset(buf, 0, bufsz); + obdname = buf; + pos = 0; + + /* lustre-OST0001-osc-<instance #> */ + 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=<Conn UUID>::<target instance>" */ + ++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; +} + + +/* 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 lvfs_run_ctxt *saved_ctxt; + struct lustre_sb_info *lsi = NULL; + int rc = 0, must_pop = 0; + bool sptlrpc_started = false; + + 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); + + ctxt = llog_get_context(mgc, LLOG_CONFIG_REPL_CTXT); + if (!ctxt) { + CERROR("missing llog context\n"); + RETURN(-EINVAL); + } + + OBD_ALLOC_PTR(saved_ctxt); + if (saved_ctxt == NULL) + RETURN(-ENOMEM); + + lctxt = llog_get_context(mgc, LLOG_CONFIG_ORIG_CTXT); + + 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(NULL, ctxt, cld->cld_logname, + &cld->cld_cfg); + EXIT; + +out_pop: + llog_ctxt_put(ctxt); + if (lctxt) + llog_ctxt_put(lctxt); + if (must_pop) + pop_ctxt(saved_ctxt, &mgc->obd_lvfs_ctxt, NULL); + + OBD_FREE_PTR(saved_ctxt); + /* + * update settings on existing OBDs. doing it inside + * of llog_process_lock so no device is attaching/detaching + * in parallel. + * the logname must be <fsname>-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")); + } + + 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); + } + 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_llog_init = mgc_llog_init, + .o_llog_finish = mgc_llog_finish, + .o_process_config = mgc_process_config, +}; + +int __init mgc_init(void) +{ + return class_register_type(&mgc_obd_ops, NULL, NULL, + LUSTRE_MGC_NAME, NULL); +} + +static void /*__exit*/ mgc_exit(void) +{ + class_unregister_type(LUSTRE_MGC_NAME); +} + +MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>"); +MODULE_DESCRIPTION("Lustre Management Client"); +MODULE_LICENSE("GPL"); + +module_init(mgc_init); +module_exit(mgc_exit); |