4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2013, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/mgc/mgc_request.c
38 * Author: Nathan Rutman <nathan@clusterfs.com>
41 #define DEBUG_SUBSYSTEM S_MGC
42 #define D_MGC D_CONFIG /*|D_WARNING*/
44 #include <linux/module.h>
45 #include <obd_class.h>
46 #include <lustre_dlm.h>
47 #include <lprocfs_status.h>
48 #include <lustre_log.h>
49 #include <lustre_disk.h>
50 #include <dt_object.h>
52 #include "mgc_internal.h"
54 static int mgc_name2resid(char *name, int len, struct ldlm_res_id *res_id,
59 if (len > sizeof(resname)) {
60 CERROR("name too long: %s\n", name);
64 CERROR("missing name: %s\n", name);
67 memcpy(&resname, name, len);
69 /* Always use the same endianness for the resid */
70 memset(res_id, 0, sizeof(*res_id));
71 res_id->name[0] = cpu_to_le64(resname);
72 /* XXX: unfortunately, sptlprc and config llog share one lock */
75 case CONFIG_T_SPTLRPC:
78 case CONFIG_T_RECOVER:
85 res_id->name[1] = cpu_to_le64(resname);
86 CDEBUG(D_MGC, "log %s to resid "LPX64"/"LPX64" (%.8s)\n", name,
87 res_id->name[0], res_id->name[1], (char *)&res_id->name[0]);
91 int mgc_fsname2resid(char *fsname, struct ldlm_res_id *res_id, int type)
93 /* fsname is at most 8 chars long, maybe contain "-".
94 * e.g. "lustre", "SUN-000" */
95 return mgc_name2resid(fsname, strlen(fsname), res_id, type);
97 EXPORT_SYMBOL(mgc_fsname2resid);
99 int mgc_logname2resid(char *logname, struct ldlm_res_id *res_id, int type)
104 /* logname consists of "fsname-nodetype".
105 * e.g. "lustre-MDT0001", "SUN-000-client"
106 * there is an exception: llog "params" */
107 name_end = strrchr(logname, '-');
109 len = strlen(logname);
111 len = name_end - logname;
112 return mgc_name2resid(logname, len, res_id, type);
115 /********************** config llog list **********************/
116 static struct list_head config_llog_list = LIST_HEAD_INIT(config_llog_list);
117 static DEFINE_SPINLOCK(config_list_lock);
119 /* Take a reference to a config log */
120 static int config_log_get(struct config_llog_data *cld)
123 atomic_inc(&cld->cld_refcount);
124 CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
125 atomic_read(&cld->cld_refcount));
129 /* Drop a reference to a config log. When no longer referenced,
130 we can free the config log data */
131 static void config_log_put(struct config_llog_data *cld)
135 CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
136 atomic_read(&cld->cld_refcount));
137 LASSERT(atomic_read(&cld->cld_refcount) > 0);
139 /* spinlock to make sure no item with 0 refcount in the list */
140 if (atomic_dec_and_lock(&cld->cld_refcount, &config_list_lock)) {
141 list_del(&cld->cld_list_chain);
142 spin_unlock(&config_list_lock);
144 CDEBUG(D_MGC, "dropping config log %s\n", cld->cld_logname);
146 if (cld->cld_recover)
147 config_log_put(cld->cld_recover);
148 if (cld->cld_sptlrpc)
149 config_log_put(cld->cld_sptlrpc);
151 config_log_put(cld->cld_params);
152 if (cld_is_sptlrpc(cld))
153 sptlrpc_conf_log_stop(cld->cld_logname);
155 class_export_put(cld->cld_mgcexp);
156 OBD_FREE(cld, sizeof(*cld) + strlen(cld->cld_logname) + 1);
162 /* Find a config log by name */
164 struct config_llog_data *config_log_find(char *logname,
165 struct config_llog_instance *cfg)
167 struct config_llog_data *cld;
168 struct config_llog_data *found = NULL;
172 LASSERT(logname != NULL);
174 instance = cfg ? cfg->cfg_instance : NULL;
175 spin_lock(&config_list_lock);
176 list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
177 /* check if instance equals */
178 if (instance != cld->cld_cfg.cfg_instance)
181 /* instance may be NULL, should check name */
182 if (strcmp(logname, cld->cld_logname) == 0) {
188 atomic_inc(&found->cld_refcount);
189 LASSERT(found->cld_stopping == 0 || cld_is_sptlrpc(found) == 0);
191 spin_unlock(&config_list_lock);
196 struct config_llog_data *do_config_log_add(struct obd_device *obd,
199 struct config_llog_instance *cfg,
200 struct super_block *sb)
202 struct config_llog_data *cld;
206 CDEBUG(D_MGC, "do adding config log %s:%p\n", logname,
207 cfg ? cfg->cfg_instance : 0);
209 OBD_ALLOC(cld, sizeof(*cld) + strlen(logname) + 1);
211 RETURN(ERR_PTR(-ENOMEM));
213 strcpy(cld->cld_logname, logname);
217 cld->cld_cfg.cfg_callback = class_config_llog_handler;
218 mutex_init(&cld->cld_lock);
219 cld->cld_cfg.cfg_last_idx = 0;
220 cld->cld_cfg.cfg_flags = 0;
221 cld->cld_cfg.cfg_sb = sb;
222 cld->cld_type = type;
223 atomic_set(&cld->cld_refcount, 1);
225 /* Keep the mgc around until we are done */
226 cld->cld_mgcexp = class_export_get(obd->obd_self_export);
228 if (cld_is_sptlrpc(cld)) {
229 sptlrpc_conf_log_start(logname);
230 cld->cld_cfg.cfg_obdname = obd->obd_name;
233 rc = mgc_logname2resid(logname, &cld->cld_resid, type);
235 spin_lock(&config_list_lock);
236 list_add(&cld->cld_list_chain, &config_llog_list);
237 spin_unlock(&config_list_lock);
244 if (cld_is_sptlrpc(cld)) {
245 rc = mgc_process_log(obd, cld);
246 if (rc && rc != -ENOENT)
247 CERROR("failed processing sptlrpc log: %d\n", rc);
253 static struct config_llog_data *config_recover_log_add(struct obd_device *obd,
255 struct config_llog_instance *cfg,
256 struct super_block *sb)
258 struct config_llog_instance lcfg = *cfg;
259 struct lustre_sb_info *lsi = s2lsi(sb);
260 struct config_llog_data *cld;
266 /* for osp-on-ost, see lustre_start_osp() */
267 if (IS_MDT(lsi) && lcfg.cfg_instance)
270 /* we have to use different llog for clients and mdts for cmd
271 * where only clients are notified if one of cmd server restarts */
272 LASSERT(strlen(fsname) < sizeof(logname) / 2);
273 strcpy(logname, fsname);
274 if (IS_SERVER(lsi)) { /* mdt */
275 LASSERT(lcfg.cfg_instance == NULL);
276 lcfg.cfg_instance = sb;
277 strcat(logname, "-mdtir");
279 LASSERT(lcfg.cfg_instance != NULL);
280 strcat(logname, "-cliir");
283 cld = do_config_log_add(obd, logname, CONFIG_T_RECOVER, &lcfg, sb);
287 static struct config_llog_data *config_params_log_add(struct obd_device *obd,
288 struct config_llog_instance *cfg, struct super_block *sb)
290 struct config_llog_instance lcfg = *cfg;
291 struct config_llog_data *cld;
293 lcfg.cfg_instance = sb;
295 cld = do_config_log_add(obd, PARAMS_FILENAME, CONFIG_T_PARAMS,
301 /** Add this log to the list of active logs watched by an MGC.
302 * Active means we're watching for updates.
303 * We have one active log per "mount" - client instance or servername.
304 * Each instance may be at a different point in the log.
306 static int config_log_add(struct obd_device *obd, char *logname,
307 struct config_llog_instance *cfg,
308 struct super_block *sb)
310 struct lustre_sb_info *lsi = s2lsi(sb);
311 struct config_llog_data *cld;
312 struct config_llog_data *sptlrpc_cld;
313 struct config_llog_data *params_cld;
319 CDEBUG(D_MGC, "adding config log %s:%p\n", logname, cfg->cfg_instance);
322 * for each regular log, the depended sptlrpc log name is
323 * <fsname>-sptlrpc. multiple regular logs may share one sptlrpc log.
325 ptr = strrchr(logname, '-');
326 if (ptr == NULL || ptr - logname > 8) {
327 CERROR("logname %s is too long\n", logname);
331 memcpy(seclogname, logname, ptr - logname);
332 strcpy(seclogname + (ptr - logname), "-sptlrpc");
334 sptlrpc_cld = config_log_find(seclogname, NULL);
335 if (sptlrpc_cld == NULL) {
336 sptlrpc_cld = do_config_log_add(obd, seclogname,
337 CONFIG_T_SPTLRPC, NULL, NULL);
338 if (IS_ERR(sptlrpc_cld)) {
339 CERROR("can't create sptlrpc log: %s\n", seclogname);
340 GOTO(out_err, rc = PTR_ERR(sptlrpc_cld));
343 params_cld = config_params_log_add(obd, cfg, sb);
344 if (IS_ERR(params_cld)) {
345 rc = PTR_ERR(params_cld);
346 CERROR("%s: can't create params log: rc = %d\n",
351 cld = do_config_log_add(obd, logname, CONFIG_T_CONFIG, cfg, sb);
353 CERROR("can't create log: %s\n", logname);
354 GOTO(out_err2, rc = PTR_ERR(cld));
357 cld->cld_sptlrpc = sptlrpc_cld;
358 cld->cld_params = params_cld;
360 LASSERT(lsi->lsi_lmd);
361 if (!(lsi->lsi_lmd->lmd_flags & LMD_FLG_NOIR)) {
362 struct config_llog_data *recover_cld;
363 ptr = strrchr(seclogname, '-');
368 CERROR("%s: sptlrpc log name not correct, %s: "
369 "rc = %d\n", obd->obd_name, seclogname, -EINVAL);
373 recover_cld = config_recover_log_add(obd, seclogname, cfg, sb);
374 if (IS_ERR(recover_cld))
375 GOTO(out_err3, rc = PTR_ERR(recover_cld));
376 cld->cld_recover = recover_cld;
385 config_log_put(params_cld);
388 config_log_put(sptlrpc_cld);
394 DEFINE_MUTEX(llog_process_lock);
396 /** Stop watching for updates on this log.
398 static int config_log_end(char *logname, struct config_llog_instance *cfg)
400 struct config_llog_data *cld;
401 struct config_llog_data *cld_sptlrpc = NULL;
402 struct config_llog_data *cld_params = NULL;
403 struct config_llog_data *cld_recover = NULL;
407 cld = config_log_find(logname, cfg);
411 mutex_lock(&cld->cld_lock);
413 * if cld_stopping is set, it means we didn't start the log thus
414 * not owning the start ref. this can happen after previous umount:
415 * the cld still hanging there waiting for lock cancel, and we
416 * remount again but failed in the middle and call log_end without
419 if (unlikely(cld->cld_stopping)) {
420 mutex_unlock(&cld->cld_lock);
421 /* drop the ref from the find */
426 cld->cld_stopping = 1;
428 cld_recover = cld->cld_recover;
429 cld->cld_recover = NULL;
430 mutex_unlock(&cld->cld_lock);
433 mutex_lock(&cld_recover->cld_lock);
434 cld_recover->cld_stopping = 1;
435 mutex_unlock(&cld_recover->cld_lock);
436 config_log_put(cld_recover);
439 spin_lock(&config_list_lock);
440 cld_sptlrpc = cld->cld_sptlrpc;
441 cld->cld_sptlrpc = NULL;
442 cld_params = cld->cld_params;
443 cld->cld_params = NULL;
444 spin_unlock(&config_list_lock);
447 config_log_put(cld_sptlrpc);
450 mutex_lock(&cld_params->cld_lock);
451 cld_params->cld_stopping = 1;
452 mutex_unlock(&cld_params->cld_lock);
453 config_log_put(cld_params);
456 /* drop the ref from the find */
458 /* drop the start ref */
461 CDEBUG(D_MGC, "end config log %s (%d)\n", logname ? logname : "client",
467 int lprocfs_mgc_rd_ir_state(struct seq_file *m, void *data)
469 struct obd_device *obd = data;
470 struct obd_import *imp = obd->u.cli.cl_import;
471 struct obd_connect_data *ocd = &imp->imp_connect_data;
472 struct config_llog_data *cld;
475 seq_printf(m, "imperative_recovery: %s\n",
476 OCD_HAS_FLAG(ocd, IMP_RECOV) ? "ENABLED" : "DISABLED");
477 seq_printf(m, "client_state:\n");
479 spin_lock(&config_list_lock);
480 list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
481 if (cld->cld_recover == NULL)
483 seq_printf(m, " - { client: %s, nidtbl_version: %u }\n",
485 cld->cld_recover->cld_cfg.cfg_last_idx);
487 spin_unlock(&config_list_lock);
493 /* reenqueue any lost locks */
494 #define RQ_RUNNING 0x1
498 static int rq_state = 0;
499 static wait_queue_head_t rq_waitq;
500 static DECLARE_COMPLETION(rq_exit);
502 static void do_requeue(struct config_llog_data *cld)
507 LASSERT(atomic_read(&cld->cld_refcount) > 0);
509 /* Do not run mgc_process_log on a disconnected export or an
510 * export which is being disconnected. Take the client
511 * semaphore to make the check non-racy. */
512 down_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
513 if (cld->cld_mgcexp->exp_obd->u.cli.cl_conn_count != 0) {
514 CDEBUG(D_MGC, "updating log %s\n", cld->cld_logname);
515 rc = mgc_process_log(cld->cld_mgcexp->exp_obd, cld);
516 if (rc && rc != -ENOENT)
517 CERROR("failed processing log: %d\n", rc);
519 CDEBUG(D_MGC, "disconnecting, won't update log %s\n",
522 up_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
527 /* this timeout represents how many seconds MGC should wait before
528 * requeue config and recover lock to the MGS. We need to randomize this
529 * in order to not flood the MGS.
531 #define MGC_TIMEOUT_MIN_SECONDS 5
532 #define MGC_TIMEOUT_RAND_CENTISEC 0x1ff /* ~500 */
534 static int mgc_requeue_thread(void *data)
539 CDEBUG(D_MGC, "Starting requeue thread\n");
541 /* Keep trying failed locks periodically */
542 spin_lock(&config_list_lock);
543 rq_state |= RQ_RUNNING;
545 struct l_wait_info lwi;
546 struct config_llog_data *cld, *cld_prev;
547 int rand = cfs_rand() & MGC_TIMEOUT_RAND_CENTISEC;
548 int stopped = !!(rq_state & RQ_STOP);
551 /* Any new or requeued lostlocks will change the state */
552 rq_state &= ~(RQ_NOW | RQ_LATER);
553 spin_unlock(&config_list_lock);
555 /* Always wait a few seconds to allow the server who
556 caused the lock revocation to finish its setup, plus some
557 random so everyone doesn't try to reconnect at once. */
558 to = MGC_TIMEOUT_MIN_SECONDS * HZ;
559 to += rand * HZ / 100; /* rand is centi-seconds */
560 lwi = LWI_TIMEOUT(to, NULL, NULL);
561 l_wait_event(rq_waitq, rq_state & RQ_STOP, &lwi);
564 * iterate & processing through the list. for each cld, process
565 * its depending sptlrpc cld firstly (if any) and then itself.
567 * it's guaranteed any item in the list must have
568 * reference > 0; and if cld_lostlock is set, at
569 * least one reference is taken by the previous enqueue.
573 spin_lock(&config_list_lock);
574 list_for_each_entry(cld, &config_llog_list,
576 if (!cld->cld_lostlock)
579 spin_unlock(&config_list_lock);
581 LASSERT(atomic_read(&cld->cld_refcount) > 0);
583 /* Whether we enqueued again or not in mgc_process_log,
584 * we're done with the ref from the old enqueue */
586 config_log_put(cld_prev);
589 cld->cld_lostlock = 0;
590 if (likely(!stopped))
593 spin_lock(&config_list_lock);
595 spin_unlock(&config_list_lock);
597 config_log_put(cld_prev);
599 /* break after scanning the list so that we can drop
600 * refcount to losing lock clds */
601 if (unlikely(stopped)) {
602 spin_lock(&config_list_lock);
606 /* Wait a bit to see if anyone else needs a requeue */
607 lwi = (struct l_wait_info) { 0 };
608 l_wait_event(rq_waitq, rq_state & (RQ_NOW | RQ_STOP),
610 spin_lock(&config_list_lock);
612 /* spinlock and while guarantee RQ_NOW and RQ_LATER are not set */
613 rq_state &= ~RQ_RUNNING;
614 spin_unlock(&config_list_lock);
618 CDEBUG(D_MGC, "Ending requeue thread\n");
622 /* Add a cld to the list to requeue. Start the requeue thread if needed.
623 We are responsible for dropping the config log reference from here on out. */
624 static void mgc_requeue_add(struct config_llog_data *cld)
628 CDEBUG(D_INFO, "log %s: requeue (r=%d sp=%d st=%x)\n",
629 cld->cld_logname, atomic_read(&cld->cld_refcount),
630 cld->cld_stopping, rq_state);
631 LASSERT(atomic_read(&cld->cld_refcount) > 0);
633 mutex_lock(&cld->cld_lock);
634 if (cld->cld_stopping || cld->cld_lostlock) {
635 mutex_unlock(&cld->cld_lock);
638 /* this refcount will be released in mgc_requeue_thread. */
640 cld->cld_lostlock = 1;
641 mutex_unlock(&cld->cld_lock);
643 /* Hold lock for rq_state */
644 spin_lock(&config_list_lock);
645 if (rq_state & RQ_STOP) {
646 spin_unlock(&config_list_lock);
647 cld->cld_lostlock = 0;
651 spin_unlock(&config_list_lock);
657 /********************** class fns **********************/
658 static int mgc_local_llog_init(const struct lu_env *env,
659 struct obd_device *obd,
660 struct obd_device *disk)
662 struct llog_ctxt *ctxt;
667 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CONFIG_ORIG_CTXT, disk,
672 ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
674 ctxt->loc_dir = obd->u.cli.cl_mgc_configs_dir;
680 static int mgc_local_llog_fini(const struct lu_env *env,
681 struct obd_device *obd)
683 struct llog_ctxt *ctxt;
687 ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
688 llog_cleanup(env, ctxt);
693 static int mgc_fs_setup(struct obd_device *obd, struct super_block *sb)
695 struct lustre_sb_info *lsi = s2lsi(sb);
696 struct client_obd *cli = &obd->u.cli;
697 struct lu_fid rfid, fid;
698 struct dt_object *root, *dto;
705 LASSERT(lsi->lsi_dt_dev);
711 /* The mgc fs exclusion mutex. Only one fs can be setup at a time. */
712 mutex_lock(&cli->cl_mgc_mutex);
714 cfs_cleanup_group_info();
716 /* Setup the configs dir */
717 rc = lu_env_init(env, LCT_MG_THREAD);
721 fid.f_seq = FID_SEQ_LOCAL_NAME;
724 rc = local_oid_storage_init(env, lsi->lsi_dt_dev, &fid,
729 rc = dt_root_get(env, lsi->lsi_dt_dev, &rfid);
733 root = dt_locate_at(env, lsi->lsi_dt_dev, &rfid,
734 &cli->cl_mgc_los->los_dev->dd_lu_dev, NULL);
735 if (unlikely(IS_ERR(root)))
736 GOTO(out_los, rc = PTR_ERR(root));
738 dto = local_file_find_or_create(env, cli->cl_mgc_los, root,
740 S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO);
741 lu_object_put_nocache(env, &root->do_lu);
743 GOTO(out_los, rc = PTR_ERR(dto));
745 cli->cl_mgc_configs_dir = dto;
747 LASSERT(lsi->lsi_osd_exp->exp_obd->obd_lvfs_ctxt.dt);
748 rc = mgc_local_llog_init(env, obd, lsi->lsi_osd_exp->exp_obd);
752 /* We take an obd ref to insure that we can't get to mgc_cleanup
753 * without calling mgc_fs_cleanup first. */
754 class_incref(obd, "mgc_fs", obd);
756 /* We keep the cl_mgc_sem until mgc_fs_cleanup */
760 lu_object_put(env, &cli->cl_mgc_configs_dir->do_lu);
761 cli->cl_mgc_configs_dir = NULL;
765 local_oid_storage_fini(env, cli->cl_mgc_los);
766 cli->cl_mgc_los = NULL;
767 mutex_unlock(&cli->cl_mgc_mutex);
776 static int mgc_fs_cleanup(struct obd_device *obd)
779 struct client_obd *cli = &obd->u.cli;
784 LASSERT(cli->cl_mgc_los != NULL);
786 rc = lu_env_init(&env, LCT_MG_THREAD);
790 mgc_local_llog_fini(&env, obd);
792 lu_object_put_nocache(&env, &cli->cl_mgc_configs_dir->do_lu);
793 cli->cl_mgc_configs_dir = NULL;
795 local_oid_storage_fini(&env, cli->cl_mgc_los);
796 cli->cl_mgc_los = NULL;
800 class_decref(obd, "mgc_fs", obd);
801 mutex_unlock(&cli->cl_mgc_mutex);
806 static int mgc_llog_init(const struct lu_env *env, struct obd_device *obd)
808 struct llog_ctxt *ctxt;
813 /* setup only remote ctxt, the local disk context is switched per each
814 * filesystem during mgc_fs_setup() */
815 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CONFIG_REPL_CTXT, obd,
820 ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
823 llog_initiator_connect(ctxt);
829 static int mgc_llog_fini(const struct lu_env *env, struct obd_device *obd)
831 struct llog_ctxt *ctxt;
835 ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
837 llog_cleanup(env, ctxt);
843 static atomic_t mgc_count = ATOMIC_INIT(0);
844 static int mgc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
850 case OBD_CLEANUP_EARLY:
852 case OBD_CLEANUP_EXPORTS:
853 if (atomic_dec_and_test(&mgc_count)) {
855 /* stop requeue thread */
856 spin_lock(&config_list_lock);
857 running = rq_state & RQ_RUNNING;
860 spin_unlock(&config_list_lock);
863 wait_for_completion(&rq_exit);
866 obd_cleanup_client_import(obd);
867 rc = mgc_llog_fini(NULL, obd);
869 CERROR("failed to cleanup llogging subsystems\n");
875 static int mgc_cleanup(struct obd_device *obd)
880 /* COMPAT_146 - old config logs may have added profiles we don't
882 if (obd->obd_type->typ_refcnt <= 1)
883 /* Only for the last mgc */
884 class_del_profiles();
886 lprocfs_obd_cleanup(obd);
889 rc = client_obd_cleanup(obd);
893 static int mgc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
895 struct task_struct *task;
899 rc = ptlrpcd_addref();
903 rc = client_obd_setup(obd, lcfg);
905 GOTO(err_decref, rc);
907 rc = mgc_llog_init(NULL, obd);
909 CERROR("failed to setup llogging subsystems\n");
910 GOTO(err_cleanup, rc);
914 obd->obd_vars = lprocfs_mgc_obd_vars;
915 lprocfs_seq_obd_setup(obd);
917 sptlrpc_lprocfs_cliobd_attach(obd);
919 if (atomic_inc_return(&mgc_count) == 1) {
921 init_waitqueue_head(&rq_waitq);
923 /* start requeue thread */
924 task = kthread_run(mgc_requeue_thread, NULL, "ll_cfg_requeue");
927 CERROR("%s: cannot start requeue thread: rc = %d; "
928 "no more log updates\n",
930 GOTO(err_cleanup, rc);
932 /* rc is the task_struct pointer of mgc_requeue_thread. */
939 client_obd_cleanup(obd);
945 /* based on ll_mdc_blocking_ast */
946 static int mgc_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
947 void *data, int flag)
949 struct lustre_handle lockh;
950 struct config_llog_data *cld = (struct config_llog_data *)data;
955 case LDLM_CB_BLOCKING:
956 /* mgs wants the lock, give it up... */
957 LDLM_DEBUG(lock, "MGC blocking CB");
958 ldlm_lock2handle(lock, &lockh);
959 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
961 case LDLM_CB_CANCELING:
962 /* We've given up the lock, prepare ourselves to update. */
963 LDLM_DEBUG(lock, "MGC cancel CB");
965 CDEBUG(D_MGC, "Lock res "DLDLMRES" (%.8s)\n",
966 PLDLMRES(lock->l_resource),
967 (char *)&lock->l_resource->lr_name.name[0]);
970 CDEBUG(D_INFO, "missing data, won't requeue\n");
974 /* held at mgc_process_log(). */
975 LASSERT(atomic_read(&cld->cld_refcount) > 0);
976 /* Are we done with this log? */
977 if (cld->cld_stopping) {
978 CDEBUG(D_MGC, "log %s: stopping, won't requeue\n",
983 /* Make sure not to re-enqueue when the mgc is stopping
984 (we get called from client_disconnect_export) */
985 if (!lock->l_conn_export ||
986 !lock->l_conn_export->exp_obd->u.cli.cl_conn_count) {
987 CDEBUG(D_MGC, "log %.8s: disconnecting, won't requeue\n",
994 mgc_requeue_add(cld);
1004 /* Not sure where this should go... */
1005 /* This is the timeout value for MGS_CONNECT request plus a ping interval, such
1006 * that we can have a chance to try the secondary MGS if any. */
1007 #define MGC_ENQUEUE_LIMIT (INITIAL_CONNECT_TIMEOUT + (AT_OFF ? 0 : at_min) \
1009 #define MGC_TARGET_REG_LIMIT 10
1010 #define MGC_SEND_PARAM_LIMIT 10
1012 /* Send parameter to MGS*/
1013 static int mgc_set_mgs_param(struct obd_export *exp,
1014 struct mgs_send_param *msp)
1016 struct ptlrpc_request *req;
1017 struct mgs_send_param *req_msp, *rep_msp;
1021 req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
1022 &RQF_MGS_SET_INFO, LUSTRE_MGS_VERSION,
1027 req_msp = req_capsule_client_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
1029 ptlrpc_req_finished(req);
1033 memcpy(req_msp, msp, sizeof(*req_msp));
1034 ptlrpc_request_set_replen(req);
1036 /* Limit how long we will wait for the enqueue to complete */
1037 req->rq_delay_limit = MGC_SEND_PARAM_LIMIT;
1038 rc = ptlrpc_queue_wait(req);
1040 rep_msp = req_capsule_server_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
1041 memcpy(msp, rep_msp, sizeof(*rep_msp));
1044 ptlrpc_req_finished(req);
1049 /* Take a config lock so we can get cancel notifications */
1050 static int mgc_enqueue(struct obd_export *exp, struct lov_stripe_md *lsm,
1051 __u32 type, ldlm_policy_data_t *policy, __u32 mode,
1052 __u64 *flags, void *bl_cb, void *cp_cb, void *gl_cb,
1053 void *data, __u32 lvb_len, void *lvb_swabber,
1054 struct lustre_handle *lockh)
1056 struct config_llog_data *cld = (struct config_llog_data *)data;
1057 struct ldlm_enqueue_info einfo = {
1060 .ei_cb_bl = mgc_blocking_ast,
1061 .ei_cb_cp = ldlm_completion_ast,
1063 struct ptlrpc_request *req;
1064 int short_limit = cld_is_sptlrpc(cld);
1068 CDEBUG(D_MGC, "Enqueue for %s (res "LPX64")\n", cld->cld_logname,
1069 cld->cld_resid.name[0]);
1071 /* We need a callback for every lockholder, so don't try to
1072 ldlm_lock_match (see rev 1.1.2.11.2.47) */
1073 req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
1074 &RQF_LDLM_ENQUEUE, LUSTRE_DLM_VERSION,
1079 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER, 0);
1080 ptlrpc_request_set_replen(req);
1082 /* check if this is server or client */
1083 if (cld->cld_cfg.cfg_sb) {
1084 struct lustre_sb_info *lsi = s2lsi(cld->cld_cfg.cfg_sb);
1085 if (lsi && IS_SERVER(lsi))
1088 /* Limit how long we will wait for the enqueue to complete */
1089 req->rq_delay_limit = short_limit ? 5 : MGC_ENQUEUE_LIMIT;
1090 rc = ldlm_cli_enqueue(exp, &req, &einfo, &cld->cld_resid, NULL, flags,
1091 NULL, 0, LVB_T_NONE, lockh, 0);
1092 /* A failed enqueue should still call the mgc_blocking_ast,
1093 where it will be requeued if needed ("grant failed"). */
1094 ptlrpc_req_finished(req);
1098 static int mgc_cancel(struct obd_export *exp, ldlm_mode_t mode,
1099 struct lustre_handle *lockh)
1103 ldlm_lock_decref(lockh, mode);
1108 static void mgc_notify_active(struct obd_device *unused)
1110 /* wakeup mgc_requeue_thread to requeue mgc lock */
1111 spin_lock(&config_list_lock);
1113 spin_unlock(&config_list_lock);
1116 /* TODO: Help the MGS rebuild nidtbl. -jay */
1119 /* Send target_reg message to MGS */
1120 static int mgc_target_register(struct obd_export *exp,
1121 struct mgs_target_info *mti)
1123 struct ptlrpc_request *req;
1124 struct mgs_target_info *req_mti, *rep_mti;
1128 req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
1129 &RQF_MGS_TARGET_REG, LUSTRE_MGS_VERSION,
1134 req_mti = req_capsule_client_get(&req->rq_pill, &RMF_MGS_TARGET_INFO);
1136 ptlrpc_req_finished(req);
1140 memcpy(req_mti, mti, sizeof(*req_mti));
1141 ptlrpc_request_set_replen(req);
1142 CDEBUG(D_MGC, "register %s\n", mti->mti_svname);
1143 /* Limit how long we will wait for the enqueue to complete */
1144 req->rq_delay_limit = MGC_TARGET_REG_LIMIT;
1146 rc = ptlrpc_queue_wait(req);
1148 rep_mti = req_capsule_server_get(&req->rq_pill,
1149 &RMF_MGS_TARGET_INFO);
1150 memcpy(mti, rep_mti, sizeof(*rep_mti));
1151 CDEBUG(D_MGC, "register %s got index = %d\n",
1152 mti->mti_svname, mti->mti_stripe_index);
1154 ptlrpc_req_finished(req);
1159 int mgc_set_info_async(const struct lu_env *env, struct obd_export *exp,
1160 obd_count keylen, void *key, obd_count vallen,
1161 void *val, struct ptlrpc_request_set *set)
1166 /* Turn off initial_recov after we try all backup servers once */
1167 if (KEY_IS(KEY_INIT_RECOV_BACKUP)) {
1168 struct obd_import *imp = class_exp2cliimp(exp);
1170 if (vallen != sizeof(int))
1172 value = *(int *)val;
1173 CDEBUG(D_MGC, "InitRecov %s %d/d%d:i%d:r%d:or%d:%s\n",
1174 imp->imp_obd->obd_name, value,
1175 imp->imp_deactive, imp->imp_invalid,
1176 imp->imp_replayable, imp->imp_obd->obd_replayable,
1177 ptlrpc_import_state_name(imp->imp_state));
1178 /* Resurrect if we previously died */
1179 if ((imp->imp_state != LUSTRE_IMP_FULL &&
1180 imp->imp_state != LUSTRE_IMP_NEW) || value > 1)
1181 ptlrpc_reconnect_import(imp);
1184 /* FIXME move this to mgc_process_config */
1185 if (KEY_IS(KEY_REGISTER_TARGET)) {
1186 struct mgs_target_info *mti;
1187 if (vallen != sizeof(struct mgs_target_info))
1189 mti = (struct mgs_target_info *)val;
1190 CDEBUG(D_MGC, "register_target %s %#x\n",
1191 mti->mti_svname, mti->mti_flags);
1192 rc = mgc_target_register(exp, mti);
1195 if (KEY_IS(KEY_SET_FS)) {
1196 struct super_block *sb = (struct super_block *)val;
1198 if (vallen != sizeof(struct super_block))
1201 rc = mgc_fs_setup(exp->exp_obd, sb);
1204 if (KEY_IS(KEY_CLEAR_FS)) {
1207 rc = mgc_fs_cleanup(exp->exp_obd);
1210 if (KEY_IS(KEY_SET_INFO)) {
1211 struct mgs_send_param *msp;
1213 msp = (struct mgs_send_param *)val;
1214 rc = mgc_set_mgs_param(exp, msp);
1217 if (KEY_IS(KEY_MGSSEC)) {
1218 struct client_obd *cli = &exp->exp_obd->u.cli;
1219 struct sptlrpc_flavor flvr;
1222 * empty string means using current flavor, if which haven't
1223 * been set yet, set it as null.
1225 * if flavor has been set previously, check the asking flavor
1226 * must match the existing one.
1229 if (cli->cl_flvr_mgc.sf_rpc != SPTLRPC_FLVR_INVALID)
1235 rc = sptlrpc_parse_flavor(val, &flvr);
1237 CERROR("invalid sptlrpc flavor %s to MGS\n",
1243 * caller already hold a mutex
1245 if (cli->cl_flvr_mgc.sf_rpc == SPTLRPC_FLVR_INVALID) {
1246 cli->cl_flvr_mgc = flvr;
1247 } else if (memcmp(&cli->cl_flvr_mgc, &flvr,
1248 sizeof(flvr)) != 0) {
1251 sptlrpc_flavor2name(&cli->cl_flvr_mgc,
1253 LCONSOLE_ERROR("asking sptlrpc flavor %s to MGS but "
1254 "currently %s is in use\n",
1264 static int mgc_get_info(const struct lu_env *env, struct obd_export *exp,
1265 __u32 keylen, void *key, __u32 *vallen, void *val,
1266 struct lov_stripe_md *unused)
1270 if (KEY_IS(KEY_CONN_DATA)) {
1271 struct obd_import *imp = class_exp2cliimp(exp);
1272 struct obd_connect_data *data = val;
1274 if (*vallen == sizeof(*data)) {
1275 *data = imp->imp_connect_data;
1283 static int mgc_import_event(struct obd_device *obd,
1284 struct obd_import *imp,
1285 enum obd_import_event event)
1289 LASSERT(imp->imp_obd == obd);
1290 CDEBUG(D_MGC, "import event %#x\n", event);
1293 case IMP_EVENT_DISCON:
1294 /* MGC imports should not wait for recovery */
1295 if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV))
1296 ptlrpc_pinger_ir_down();
1298 case IMP_EVENT_INACTIVE:
1300 case IMP_EVENT_INVALIDATE: {
1301 struct ldlm_namespace *ns = obd->obd_namespace;
1302 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
1305 case IMP_EVENT_ACTIVE:
1306 CDEBUG(D_INFO, "%s: Reactivating import\n", obd->obd_name);
1307 /* Clearing obd_no_recov allows us to continue pinging */
1308 obd->obd_no_recov = 0;
1309 mgc_notify_active(obd);
1310 if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV))
1311 ptlrpc_pinger_ir_up();
1315 case IMP_EVENT_DEACTIVATE:
1316 case IMP_EVENT_ACTIVATE:
1319 CERROR("Unknown import event %#x\n", event);
1326 CONFIG_READ_NRPAGES_INIT = 1 << (20 - PAGE_CACHE_SHIFT),
1327 CONFIG_READ_NRPAGES = 4
1330 static int mgc_apply_recover_logs(struct obd_device *mgc,
1331 struct config_llog_data *cld,
1333 void *data, int datalen, bool mne_swab)
1335 struct config_llog_instance *cfg = &cld->cld_cfg;
1336 struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb);
1337 struct mgs_nidtbl_entry *entry;
1338 struct lustre_cfg *lcfg;
1339 struct lustre_cfg_bufs bufs;
1340 u64 prev_version = 0;
1349 LASSERT(cfg->cfg_instance != NULL);
1350 LASSERT(cfg->cfg_sb == cfg->cfg_instance);
1352 OBD_ALLOC(inst, PAGE_CACHE_SIZE);
1356 if (!IS_SERVER(lsi)) {
1357 pos = snprintf(inst, PAGE_CACHE_SIZE, "%p", cfg->cfg_instance);
1358 if (pos >= PAGE_CACHE_SIZE) {
1359 OBD_FREE(inst, PAGE_CACHE_SIZE);
1363 LASSERT(IS_MDT(lsi));
1364 rc = server_name2svname(lsi->lsi_svname, inst, NULL,
1367 OBD_FREE(inst, PAGE_CACHE_SIZE);
1375 bufsz = PAGE_CACHE_SIZE - pos;
1377 while (datalen > 0) {
1378 int entry_len = sizeof(*entry);
1380 struct obd_device *obd;
1387 if (datalen < sizeof(*entry))
1390 entry = (typeof(entry))(data + off);
1393 if (entry->mne_nid_type != 0) /* only support type 0 for ipv4 */
1395 if (entry->mne_nid_count == 0) /* at least one nid entry */
1397 if (entry->mne_nid_size != sizeof(lnet_nid_t))
1400 entry_len += entry->mne_nid_count * entry->mne_nid_size;
1401 if (datalen < entry_len) /* must have entry_len at least */
1404 /* Keep this swab for normal mixed endian handling. LU-1644 */
1406 lustre_swab_mgs_nidtbl_entry(entry);
1407 if (entry->mne_length > PAGE_CACHE_SIZE) {
1408 CERROR("MNE too large (%u)\n", entry->mne_length);
1412 if (entry->mne_length < entry_len)
1415 off += entry->mne_length;
1416 datalen -= entry->mne_length;
1420 if (entry->mne_version > max_version) {
1421 CERROR("entry index(%lld) is over max_index(%lld)\n",
1422 entry->mne_version, max_version);
1426 if (prev_version >= entry->mne_version) {
1427 CERROR("index unsorted, prev %lld, now %lld\n",
1428 prev_version, entry->mne_version);
1431 prev_version = entry->mne_version;
1434 * Write a string with format "nid::instance" to
1435 * lustre/<osc|mdc>/<target>-<osc|mdc>-<instance>/import.
1438 is_ost = entry->mne_type == LDD_F_SV_TYPE_OST;
1439 memset(buf, 0, bufsz);
1443 /* lustre-OST0001-osc-<instance #> */
1444 strcpy(obdname, cld->cld_logname);
1445 cname = strrchr(obdname, '-');
1446 if (cname == NULL) {
1447 CERROR("mgc %s: invalid logname %s\n",
1448 mgc->obd_name, obdname);
1452 pos = cname - obdname;
1454 pos += sprintf(obdname + pos, "-%s%04x",
1455 is_ost ? "OST" : "MDT", entry->mne_index);
1457 cname = is_ost ? "osc" : "mdc",
1458 pos += sprintf(obdname + pos, "-%s-%s", cname, inst);
1459 lustre_cfg_bufs_reset(&bufs, obdname);
1461 /* find the obd by obdname */
1462 obd = class_name2obd(obdname);
1464 CDEBUG(D_INFO, "mgc %s: cannot find obdname %s\n",
1465 mgc->obd_name, obdname);
1467 /* this is a safe race, when the ost is starting up...*/
1471 /* osc.import = "connection=<Conn UUID>::<target instance>" */
1474 pos += sprintf(params, "%s.import=%s", cname, "connection=");
1477 down_read(&obd->u.cli.cl_sem);
1478 if (obd->u.cli.cl_import == NULL) {
1479 /* client does not connect to the OST yet */
1480 up_read(&obd->u.cli.cl_sem);
1485 /* TODO: iterate all nids to find one */
1486 /* find uuid by nid */
1487 rc = client_import_find_conn(obd->u.cli.cl_import,
1489 (struct obd_uuid *)uuid);
1490 up_read(&obd->u.cli.cl_sem);
1492 CERROR("mgc: cannot find uuid by nid %s\n",
1493 libcfs_nid2str(entry->u.nids[0]));
1497 CDEBUG(D_INFO, "Find uuid %s by nid %s\n",
1498 uuid, libcfs_nid2str(entry->u.nids[0]));
1500 pos += strlen(uuid);
1501 pos += sprintf(buf + pos, "::%u", entry->mne_instance);
1502 LASSERT(pos < bufsz);
1504 lustre_cfg_bufs_set_string(&bufs, 1, params);
1507 lcfg = lustre_cfg_new(LCFG_PARAM, &bufs);
1509 CERROR("mgc: cannot allocate memory\n");
1513 CDEBUG(D_INFO, "ir apply logs "LPD64"/"LPD64" for %s -> %s\n",
1514 prev_version, max_version, obdname, params);
1516 rc = class_process_config(lcfg);
1517 lustre_cfg_free(lcfg);
1519 CDEBUG(D_INFO, "process config for %s error %d\n",
1522 /* continue, even one with error */
1525 OBD_FREE(inst, PAGE_CACHE_SIZE);
1530 * This function is called if this client was notified for target restarting
1531 * by the MGS. A CONFIG_READ RPC is going to send to fetch recovery logs.
1533 static int mgc_process_recover_log(struct obd_device *obd,
1534 struct config_llog_data *cld)
1536 struct ptlrpc_request *req = NULL;
1537 struct config_llog_instance *cfg = &cld->cld_cfg;
1538 struct mgs_config_body *body;
1539 struct mgs_config_res *res;
1540 struct ptlrpc_bulk_desc *desc;
1541 struct page **pages;
1544 bool mne_swab = false;
1550 /* allocate buffer for bulk transfer.
1551 * if this is the first time for this mgs to read logs,
1552 * CONFIG_READ_NRPAGES_INIT will be used since it will read all logs
1553 * once; otherwise, it only reads increment of logs, this should be
1554 * small and CONFIG_READ_NRPAGES will be used.
1556 nrpages = CONFIG_READ_NRPAGES;
1557 if (cfg->cfg_last_idx == 0) /* the first time */
1558 nrpages = CONFIG_READ_NRPAGES_INIT;
1560 OBD_ALLOC(pages, sizeof(*pages) * nrpages);
1562 GOTO(out, rc = -ENOMEM);
1564 for (i = 0; i < nrpages; i++) {
1565 pages[i] = alloc_page(GFP_IOFS);
1566 if (pages[i] == NULL)
1567 GOTO(out, rc = -ENOMEM);
1571 LASSERT(cld_is_recover(cld));
1572 LASSERT(mutex_is_locked(&cld->cld_lock));
1573 req = ptlrpc_request_alloc(class_exp2cliimp(cld->cld_mgcexp),
1574 &RQF_MGS_CONFIG_READ);
1576 GOTO(out, rc = -ENOMEM);
1578 rc = ptlrpc_request_pack(req, LUSTRE_MGS_VERSION, MGS_CONFIG_READ);
1583 body = req_capsule_client_get(&req->rq_pill, &RMF_MGS_CONFIG_BODY);
1584 LASSERT(body != NULL);
1585 LASSERT(sizeof(body->mcb_name) > strlen(cld->cld_logname));
1586 if (strlcpy(body->mcb_name, cld->cld_logname, sizeof(body->mcb_name))
1587 >= sizeof(body->mcb_name))
1588 GOTO(out, rc = -E2BIG);
1589 body->mcb_offset = cfg->cfg_last_idx + 1;
1590 body->mcb_type = cld->cld_type;
1591 body->mcb_bits = PAGE_CACHE_SHIFT;
1592 body->mcb_units = nrpages;
1594 /* allocate bulk transfer descriptor */
1595 desc = ptlrpc_prep_bulk_imp(req, nrpages, 1, BULK_PUT_SINK,
1598 GOTO(out, rc = -ENOMEM);
1600 for (i = 0; i < nrpages; i++)
1601 ptlrpc_prep_bulk_page_pin(desc, pages[i], 0, PAGE_CACHE_SIZE);
1603 ptlrpc_request_set_replen(req);
1604 rc = ptlrpc_queue_wait(req);
1608 res = req_capsule_server_get(&req->rq_pill, &RMF_MGS_CONFIG_RES);
1609 if (res->mcr_size < res->mcr_offset)
1610 GOTO(out, rc = -EINVAL);
1612 /* always update the index even though it might have errors with
1613 * handling the recover logs */
1614 cfg->cfg_last_idx = res->mcr_offset;
1615 eof = res->mcr_offset == res->mcr_size;
1617 CDEBUG(D_INFO, "Latest version "LPD64", more %d.\n",
1618 res->mcr_offset, eof == false);
1620 ealen = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, 0);
1622 GOTO(out, rc = ealen);
1624 if (ealen > nrpages << PAGE_CACHE_SHIFT)
1625 GOTO(out, rc = -EINVAL);
1627 if (ealen == 0) { /* no logs transferred */
1633 mne_swab = !!ptlrpc_rep_need_swab(req);
1634 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 2, 50, 0)
1635 /* This import flag means the server did an extra swab of IR MNE
1636 * records (fixed in LU-1252), reverse it here if needed. LU-1644 */
1637 if (unlikely(req->rq_import->imp_need_mne_swab))
1638 mne_swab = !mne_swab;
1640 #warning "LU-1644: Remove old OBD_CONNECT_MNE_SWAB fixup and imp_need_mne_swab"
1643 for (i = 0; i < nrpages && ealen > 0; i++) {
1647 ptr = kmap(pages[i]);
1648 rc2 = mgc_apply_recover_logs(obd, cld, res->mcr_offset, ptr,
1649 min_t(int, ealen, PAGE_CACHE_SIZE),
1653 CWARN("Process recover log %s error %d\n",
1654 cld->cld_logname, rc2);
1658 ealen -= PAGE_CACHE_SIZE;
1663 ptlrpc_req_finished(req);
1665 if (rc == 0 && !eof)
1669 for (i = 0; i < nrpages; i++) {
1670 if (pages[i] == NULL)
1672 __free_page(pages[i]);
1674 OBD_FREE(pages, sizeof(*pages) * nrpages);
1679 /* Copy a remote log locally */
1680 static int mgc_llog_local_copy(const struct lu_env *env,
1681 struct obd_device *obd,
1682 struct llog_ctxt *rctxt,
1683 struct llog_ctxt *lctxt, char *logname)
1691 * - copy it to backup using llog_backup()
1692 * - copy remote llog to logname using llog_backup()
1693 * - if failed then move bakup to logname again
1696 OBD_ALLOC(temp_log, strlen(logname) + 1);
1699 sprintf(temp_log, "%sT", logname);
1701 /* make a copy of local llog at first */
1702 rc = llog_backup(env, obd, lctxt, lctxt, logname, temp_log);
1703 if (rc < 0 && rc != -ENOENT)
1705 /* copy remote llog to the local copy */
1706 rc = llog_backup(env, obd, rctxt, lctxt, logname, logname);
1707 if (rc == -ENOENT) {
1708 /* no remote llog, delete local one too */
1709 llog_erase(env, lctxt, NULL, logname);
1710 } else if (rc < 0) {
1711 /* error during backup, get local one back from the copy */
1712 llog_backup(env, obd, lctxt, lctxt, temp_log, logname);
1714 CERROR("%s: failed to copy remote log %s: rc = %d\n",
1715 obd->obd_name, logname, rc);
1717 llog_erase(env, lctxt, NULL, temp_log);
1718 OBD_FREE(temp_log, strlen(logname) + 1);
1722 /* local_only means it cannot get remote llogs */
1723 static int mgc_process_cfg_log(struct obd_device *mgc,
1724 struct config_llog_data *cld, int local_only)
1726 struct llog_ctxt *ctxt, *lctxt = NULL;
1727 struct client_obd *cli = &mgc->u.cli;
1728 struct lustre_sb_info *lsi = NULL;
1730 bool sptlrpc_started = false;
1736 LASSERT(mutex_is_locked(&cld->cld_lock));
1739 * local copy of sptlrpc log is controlled elsewhere, don't try to
1742 if (cld_is_sptlrpc(cld) && local_only)
1745 if (cld->cld_cfg.cfg_sb)
1746 lsi = s2lsi(cld->cld_cfg.cfg_sb);
1752 rc = lu_env_init(env, LCT_MG_THREAD);
1756 ctxt = llog_get_context(mgc, LLOG_CONFIG_REPL_CTXT);
1759 lctxt = llog_get_context(mgc, LLOG_CONFIG_ORIG_CTXT);
1761 /* Copy the setup log locally if we can. Don't mess around if we're
1762 * running an MGS though (logs are already local). */
1763 if (lctxt && lsi && IS_SERVER(lsi) && !IS_MGS(lsi) &&
1764 cli->cl_mgc_configs_dir != NULL &&
1765 lu2dt_dev(cli->cl_mgc_configs_dir->do_lu.lo_dev) ==
1768 /* Only try to copy log if we have the lock. */
1769 rc = mgc_llog_local_copy(env, mgc, ctxt, lctxt,
1771 if (local_only || rc) {
1772 if (strcmp(cld->cld_logname, PARAMS_FILENAME) != 0 &&
1773 llog_is_empty(env, lctxt, cld->cld_logname)) {
1774 LCONSOLE_ERROR_MSG(0x13a, "Failed to get MGS "
1775 "log %s and no local copy."
1776 "\n", cld->cld_logname);
1777 GOTO(out_pop, rc = -ENOENT);
1779 CDEBUG(D_MGC, "Failed to get MGS log %s, using local "
1780 "copy for now, will try to update later.\n",
1784 /* Now, whether we copied or not, start using the local llog.
1785 * If we failed to copy, we'll start using whatever the old
1787 llog_ctxt_put(ctxt);
1791 if (local_only) /* no local log at client side */
1792 GOTO(out_pop, rc = -EIO);
1795 if (cld_is_sptlrpc(cld)) {
1796 sptlrpc_conf_log_update_begin(cld->cld_logname);
1797 sptlrpc_started = true;
1800 /* logname and instance info should be the same, so use our
1801 * copy of the instance for the update. The cfg_last_idx will
1802 * be updated here. */
1803 rc = class_config_parse_llog(env, ctxt, cld->cld_logname,
1808 __llog_ctxt_put(env, ctxt);
1810 __llog_ctxt_put(env, lctxt);
1813 * update settings on existing OBDs. doing it inside
1814 * of llog_process_lock so no device is attaching/detaching
1816 * the logname must be <fsname>-sptlrpc
1818 if (sptlrpc_started) {
1819 LASSERT(cld_is_sptlrpc(cld));
1820 sptlrpc_conf_log_update_end(cld->cld_logname);
1821 class_notify_sptlrpc_conf(cld->cld_logname,
1822 strlen(cld->cld_logname) -
1823 strlen("-sptlrpc"));
1832 /** Get a config log from the MGS and process it.
1833 * This func is called for both clients and servers.
1834 * Copy the log locally before parsing it if appropriate (non-MGS server)
1836 int mgc_process_log(struct obd_device *mgc, struct config_llog_data *cld)
1838 struct lustre_handle lockh = { 0 };
1839 __u64 flags = LDLM_FL_NO_LRU;
1845 /* I don't want multiple processes running process_log at once --
1846 sounds like badness. It actually might be fine, as long as
1847 we're not trying to update from the same log
1848 simultaneously (in which case we should use a per-log sem.) */
1849 mutex_lock(&cld->cld_lock);
1850 if (cld->cld_stopping) {
1851 mutex_unlock(&cld->cld_lock);
1855 OBD_FAIL_TIMEOUT(OBD_FAIL_MGC_PAUSE_PROCESS_LOG, 20);
1857 CDEBUG(D_MGC, "Process log %s:%p from %d\n", cld->cld_logname,
1858 cld->cld_cfg.cfg_instance, cld->cld_cfg.cfg_last_idx + 1);
1860 /* Get the cfg lock on the llog */
1861 rcl = mgc_enqueue(mgc->u.cli.cl_mgc_mgsexp, NULL, LDLM_PLAIN, NULL,
1862 LCK_CR, &flags, NULL, NULL, NULL,
1863 cld, 0, NULL, &lockh);
1865 /* Get the cld, it will be released in mgc_blocking_ast. */
1866 config_log_get(cld);
1867 rc = ldlm_lock_set_data(&lockh, (void *)cld);
1870 CDEBUG(D_MGC, "Can't get cfg lock: %d\n", rcl);
1872 /* mark cld_lostlock so that it will requeue
1873 * after MGC becomes available. */
1874 cld->cld_lostlock = 1;
1875 /* Get extra reference, it will be put in requeue thread */
1876 config_log_get(cld);
1880 if (cld_is_recover(cld)) {
1881 rc = 0; /* this is not a fatal error for recover log */
1883 rc = mgc_process_recover_log(mgc, cld);
1885 rc = mgc_process_cfg_log(mgc, cld, rcl != 0);
1888 CDEBUG(D_MGC, "%s: configuration from log '%s' %sed (%d).\n",
1889 mgc->obd_name, cld->cld_logname, rc ? "fail" : "succeed", rc);
1891 mutex_unlock(&cld->cld_lock);
1893 /* Now drop the lock so MGS can revoke it */
1895 rcl = mgc_cancel(mgc->u.cli.cl_mgc_mgsexp, LCK_CR, &lockh);
1897 CERROR("Can't drop cfg lock: %d\n", rcl);
1904 /** Called from lustre_process_log.
1905 * LCFG_LOG_START gets the config log from the MGS, processes it to start
1906 * any services, and adds it to the list logs to watch (follow).
1908 static int mgc_process_config(struct obd_device *obd, obd_count len, void *buf)
1910 struct lustre_cfg *lcfg = buf;
1911 struct config_llog_instance *cfg = NULL;
1916 switch(lcfg->lcfg_command) {
1917 case LCFG_LOV_ADD_OBD: {
1918 /* Overloading this cfg command: register a new target */
1919 struct mgs_target_info *mti;
1921 if (LUSTRE_CFG_BUFLEN(lcfg, 1) !=
1922 sizeof(struct mgs_target_info))
1923 GOTO(out, rc = -EINVAL);
1925 mti = (struct mgs_target_info *)lustre_cfg_buf(lcfg, 1);
1926 CDEBUG(D_MGC, "add_target %s %#x\n",
1927 mti->mti_svname, mti->mti_flags);
1928 rc = mgc_target_register(obd->u.cli.cl_mgc_mgsexp, mti);
1931 case LCFG_LOV_DEL_OBD:
1932 /* Unregister has no meaning at the moment. */
1933 CERROR("lov_del_obd unimplemented\n");
1936 case LCFG_SPTLRPC_CONF: {
1937 rc = sptlrpc_process_config(lcfg);
1940 case LCFG_LOG_START: {
1941 struct config_llog_data *cld;
1942 struct super_block *sb;
1944 logname = lustre_cfg_string(lcfg, 1);
1945 cfg = (struct config_llog_instance *)lustre_cfg_buf(lcfg, 2);
1946 sb = *(struct super_block **)lustre_cfg_buf(lcfg, 3);
1948 CDEBUG(D_MGC, "parse_log %s from %d\n", logname,
1951 /* We're only called through here on the initial mount */
1952 rc = config_log_add(obd, logname, cfg, sb);
1955 cld = config_log_find(logname, cfg);
1962 /* FIXME only set this for old logs! Right now this forces
1963 us to always skip the "inside markers" check */
1964 cld->cld_cfg.cfg_flags |= CFG_F_COMPAT146;
1966 rc = mgc_process_log(obd, cld);
1967 if (rc == 0 && cld->cld_recover != NULL) {
1968 if (OCD_HAS_FLAG(&obd->u.cli.cl_import->
1969 imp_connect_data, IMP_RECOV)) {
1970 rc = mgc_process_log(obd, cld->cld_recover);
1972 struct config_llog_data *cir = cld->cld_recover;
1973 cld->cld_recover = NULL;
1974 config_log_put(cir);
1977 CERROR("Cannot process recover llog %d\n", rc);
1980 if (rc == 0 && cld->cld_params != NULL) {
1981 rc = mgc_process_log(obd, cld->cld_params);
1982 if (rc == -ENOENT) {
1983 CDEBUG(D_MGC, "There is no params "
1984 "config file yet\n");
1987 /* params log is optional */
1989 CERROR("%s: can't process params llog: rc = %d\n",
1992 config_log_put(cld);
1996 case LCFG_LOG_END: {
1997 logname = lustre_cfg_string(lcfg, 1);
1999 if (lcfg->lcfg_bufcount >= 2)
2000 cfg = (struct config_llog_instance *)lustre_cfg_buf(
2002 rc = config_log_end(logname, cfg);
2006 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
2007 GOTO(out, rc = -EINVAL);
2015 struct obd_ops mgc_obd_ops = {
2016 .o_owner = THIS_MODULE,
2017 .o_setup = mgc_setup,
2018 .o_precleanup = mgc_precleanup,
2019 .o_cleanup = mgc_cleanup,
2020 .o_add_conn = client_import_add_conn,
2021 .o_del_conn = client_import_del_conn,
2022 .o_connect = client_connect_import,
2023 .o_disconnect = client_disconnect_export,
2024 .o_set_info_async = mgc_set_info_async,
2025 .o_get_info = mgc_get_info,
2026 .o_import_event = mgc_import_event,
2027 .o_process_config = mgc_process_config,
2030 int __init mgc_init(void)
2032 return class_register_type(&mgc_obd_ops, NULL, true, NULL,
2033 #ifndef HAVE_ONLY_PROCFS_SEQ
2036 LUSTRE_MGC_NAME, NULL);
2039 static void /*__exit*/ mgc_exit(void)
2041 class_unregister_type(LUSTRE_MGC_NAME);
2044 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
2045 MODULE_DESCRIPTION("Lustre Management Client");
2046 MODULE_LICENSE("GPL");
2048 module_init(mgc_init);
2049 module_exit(mgc_exit);