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, 2015, 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 <linux/kthread.h>
47 #include <dt_object.h>
48 #include <lprocfs_status.h>
49 #include <lustre_dlm.h>
50 #include <lustre_disk.h>
51 #include <lustre_log.h>
52 #include <lustre_swab.h>
53 #include <obd_class.h>
55 #include "mgc_internal.h"
57 static int mgc_name2resid(char *name, int len, struct ldlm_res_id *res_id,
62 if (len > sizeof(resname)) {
63 CERROR("name too long: %s\n", name);
67 CERROR("missing name: %s\n", name);
70 memcpy(&resname, name, len);
72 /* Always use the same endianness for the resid */
73 memset(res_id, 0, sizeof(*res_id));
74 res_id->name[0] = cpu_to_le64(resname);
75 /* XXX: unfortunately, sptlprc and config llog share one lock */
78 case CONFIG_T_SPTLRPC:
81 case CONFIG_T_RECOVER:
88 res_id->name[1] = cpu_to_le64(resname);
89 CDEBUG(D_MGC, "log %s to resid "LPX64"/"LPX64" (%.8s)\n", name,
90 res_id->name[0], res_id->name[1], (char *)&res_id->name[0]);
94 int mgc_fsname2resid(char *fsname, struct ldlm_res_id *res_id, int type)
96 /* fsname is at most 8 chars long, maybe contain "-".
97 * e.g. "lustre", "SUN-000" */
98 return mgc_name2resid(fsname, strlen(fsname), res_id, type);
100 EXPORT_SYMBOL(mgc_fsname2resid);
102 static int mgc_logname2resid(char *logname, struct ldlm_res_id *res_id,
108 /* logname consists of "fsname-nodetype".
109 * e.g. "lustre-MDT0001", "SUN-000-client"
110 * there is an exception: llog "params" */
111 name_end = strrchr(logname, '-');
113 len = strlen(logname);
115 len = name_end - logname;
116 return mgc_name2resid(logname, len, res_id, type);
119 /********************** config llog list **********************/
120 static struct list_head config_llog_list = LIST_HEAD_INIT(config_llog_list);
121 static DEFINE_SPINLOCK(config_list_lock);
123 /* Take a reference to a config log */
124 static int config_log_get(struct config_llog_data *cld)
127 atomic_inc(&cld->cld_refcount);
128 CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
129 atomic_read(&cld->cld_refcount));
133 /* Drop a reference to a config log. When no longer referenced,
134 we can free the config log data */
135 static void config_log_put(struct config_llog_data *cld)
139 CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
140 atomic_read(&cld->cld_refcount));
141 LASSERT(atomic_read(&cld->cld_refcount) > 0);
143 /* spinlock to make sure no item with 0 refcount in the list */
144 if (atomic_dec_and_lock(&cld->cld_refcount, &config_list_lock)) {
145 list_del(&cld->cld_list_chain);
146 spin_unlock(&config_list_lock);
148 CDEBUG(D_MGC, "dropping config log %s\n", cld->cld_logname);
150 if (cld->cld_recover)
151 config_log_put(cld->cld_recover);
152 if (cld->cld_sptlrpc)
153 config_log_put(cld->cld_sptlrpc);
155 config_log_put(cld->cld_params);
156 if (cld_is_sptlrpc(cld))
157 sptlrpc_conf_log_stop(cld->cld_logname);
159 class_export_put(cld->cld_mgcexp);
160 OBD_FREE(cld, sizeof(*cld) + strlen(cld->cld_logname) + 1);
166 /* Find a config log by name */
168 struct config_llog_data *config_log_find(char *logname,
169 struct config_llog_instance *cfg)
171 struct config_llog_data *cld;
172 struct config_llog_data *found = NULL;
176 LASSERT(logname != NULL);
178 instance = cfg ? cfg->cfg_instance : NULL;
179 spin_lock(&config_list_lock);
180 list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
181 /* check if instance equals */
182 if (instance != cld->cld_cfg.cfg_instance)
185 /* instance may be NULL, should check name */
186 if (strcmp(logname, cld->cld_logname) == 0) {
192 atomic_inc(&found->cld_refcount);
193 LASSERT(found->cld_stopping == 0 || cld_is_sptlrpc(found) == 0);
195 spin_unlock(&config_list_lock);
200 struct config_llog_data *do_config_log_add(struct obd_device *obd,
203 struct config_llog_instance *cfg,
204 struct super_block *sb)
206 struct config_llog_data *cld;
210 CDEBUG(D_MGC, "do adding config log %s:%p\n", logname,
211 cfg ? cfg->cfg_instance : NULL);
213 OBD_ALLOC(cld, sizeof(*cld) + strlen(logname) + 1);
215 RETURN(ERR_PTR(-ENOMEM));
217 strcpy(cld->cld_logname, logname);
221 cld->cld_cfg.cfg_callback = class_config_llog_handler;
222 mutex_init(&cld->cld_lock);
223 cld->cld_cfg.cfg_last_idx = 0;
224 cld->cld_cfg.cfg_flags = 0;
225 cld->cld_cfg.cfg_sb = sb;
226 cld->cld_type = type;
227 atomic_set(&cld->cld_refcount, 1);
229 /* Keep the mgc around until we are done */
230 cld->cld_mgcexp = class_export_get(obd->obd_self_export);
232 if (cld_is_sptlrpc(cld)) {
233 sptlrpc_conf_log_start(logname);
234 cld->cld_cfg.cfg_obdname = obd->obd_name;
237 rc = mgc_logname2resid(logname, &cld->cld_resid, type);
239 spin_lock(&config_list_lock);
240 list_add(&cld->cld_list_chain, &config_llog_list);
241 spin_unlock(&config_list_lock);
248 if (cld_is_sptlrpc(cld)) {
249 rc = mgc_process_log(obd, cld);
250 if (rc && rc != -ENOENT)
251 CERROR("failed processing sptlrpc log: %d\n", rc);
257 static struct config_llog_data *config_recover_log_add(struct obd_device *obd,
259 struct config_llog_instance *cfg,
260 struct super_block *sb)
262 struct config_llog_instance lcfg = *cfg;
263 struct lustre_sb_info *lsi = s2lsi(sb);
264 struct config_llog_data *cld;
270 /* for osp-on-ost, see lustre_start_osp() */
271 if (IS_MDT(lsi) && lcfg.cfg_instance)
274 /* we have to use different llog for clients and mdts for cmd
275 * where only clients are notified if one of cmd server restarts */
276 LASSERT(strlen(fsname) < sizeof(logname) / 2);
277 strcpy(logname, fsname);
278 if (IS_SERVER(lsi)) { /* mdt */
279 LASSERT(lcfg.cfg_instance == NULL);
280 lcfg.cfg_instance = sb;
281 strcat(logname, "-mdtir");
283 LASSERT(lcfg.cfg_instance != NULL);
284 strcat(logname, "-cliir");
287 cld = do_config_log_add(obd, logname, CONFIG_T_RECOVER, &lcfg, sb);
291 static struct config_llog_data *config_params_log_add(struct obd_device *obd,
292 struct config_llog_instance *cfg, struct super_block *sb)
294 struct config_llog_instance lcfg = *cfg;
295 struct config_llog_data *cld;
297 lcfg.cfg_instance = sb;
299 cld = do_config_log_add(obd, PARAMS_FILENAME, CONFIG_T_PARAMS,
305 /** Add this log to the list of active logs watched by an MGC.
306 * Active means we're watching for updates.
307 * We have one active log per "mount" - client instance or servername.
308 * Each instance may be at a different point in the log.
310 static int config_log_add(struct obd_device *obd, char *logname,
311 struct config_llog_instance *cfg,
312 struct super_block *sb)
314 struct lustre_sb_info *lsi = s2lsi(sb);
315 struct config_llog_data *cld;
316 struct config_llog_data *sptlrpc_cld;
317 struct config_llog_data *params_cld;
323 CDEBUG(D_MGC, "adding config log %s:%p\n", logname, cfg->cfg_instance);
326 * for each regular log, the depended sptlrpc log name is
327 * <fsname>-sptlrpc. multiple regular logs may share one sptlrpc log.
329 ptr = strrchr(logname, '-');
330 if (ptr == NULL || ptr - logname > 8) {
331 CERROR("logname %s is too long\n", logname);
335 memcpy(seclogname, logname, ptr - logname);
336 strcpy(seclogname + (ptr - logname), "-sptlrpc");
338 sptlrpc_cld = config_log_find(seclogname, NULL);
339 if (sptlrpc_cld == NULL) {
340 sptlrpc_cld = do_config_log_add(obd, seclogname,
341 CONFIG_T_SPTLRPC, NULL, NULL);
342 if (IS_ERR(sptlrpc_cld)) {
343 CERROR("can't create sptlrpc log: %s\n", seclogname);
344 GOTO(out_err, rc = PTR_ERR(sptlrpc_cld));
347 params_cld = config_params_log_add(obd, cfg, sb);
348 if (IS_ERR(params_cld)) {
349 rc = PTR_ERR(params_cld);
350 CERROR("%s: can't create params log: rc = %d\n",
355 cld = do_config_log_add(obd, logname, CONFIG_T_CONFIG, cfg, sb);
357 CERROR("can't create log: %s\n", logname);
358 GOTO(out_err2, rc = PTR_ERR(cld));
361 cld->cld_sptlrpc = sptlrpc_cld;
362 cld->cld_params = params_cld;
364 LASSERT(lsi->lsi_lmd);
365 if (!(lsi->lsi_lmd->lmd_flags & LMD_FLG_NOIR)) {
366 struct config_llog_data *recover_cld;
367 ptr = strrchr(seclogname, '-');
372 CERROR("%s: sptlrpc log name not correct, %s: "
373 "rc = %d\n", obd->obd_name, seclogname, -EINVAL);
377 recover_cld = config_recover_log_add(obd, seclogname, cfg, sb);
378 if (IS_ERR(recover_cld))
379 GOTO(out_err3, rc = PTR_ERR(recover_cld));
380 cld->cld_recover = recover_cld;
389 config_log_put(params_cld);
392 config_log_put(sptlrpc_cld);
398 DEFINE_MUTEX(llog_process_lock);
400 /** Stop watching for updates on this log.
402 static int config_log_end(char *logname, struct config_llog_instance *cfg)
404 struct config_llog_data *cld;
405 struct config_llog_data *cld_sptlrpc = NULL;
406 struct config_llog_data *cld_params = NULL;
407 struct config_llog_data *cld_recover = NULL;
411 cld = config_log_find(logname, cfg);
415 mutex_lock(&cld->cld_lock);
417 * if cld_stopping is set, it means we didn't start the log thus
418 * not owning the start ref. this can happen after previous umount:
419 * the cld still hanging there waiting for lock cancel, and we
420 * remount again but failed in the middle and call log_end without
423 if (unlikely(cld->cld_stopping)) {
424 mutex_unlock(&cld->cld_lock);
425 /* drop the ref from the find */
430 cld->cld_stopping = 1;
432 cld_recover = cld->cld_recover;
433 cld->cld_recover = NULL;
434 mutex_unlock(&cld->cld_lock);
437 mutex_lock(&cld_recover->cld_lock);
438 cld_recover->cld_stopping = 1;
439 mutex_unlock(&cld_recover->cld_lock);
440 config_log_put(cld_recover);
443 spin_lock(&config_list_lock);
444 cld_sptlrpc = cld->cld_sptlrpc;
445 cld->cld_sptlrpc = NULL;
446 cld_params = cld->cld_params;
447 cld->cld_params = NULL;
448 spin_unlock(&config_list_lock);
451 config_log_put(cld_sptlrpc);
454 mutex_lock(&cld_params->cld_lock);
455 cld_params->cld_stopping = 1;
456 mutex_unlock(&cld_params->cld_lock);
457 config_log_put(cld_params);
460 /* drop the ref from the find */
462 /* drop the start ref */
465 CDEBUG(D_MGC, "end config log %s (%d)\n", logname ? logname : "client",
470 #ifdef CONFIG_PROC_FS
471 int lprocfs_mgc_rd_ir_state(struct seq_file *m, void *data)
473 struct obd_device *obd = data;
474 struct obd_import *imp;
475 struct obd_connect_data *ocd;
476 struct config_llog_data *cld;
479 LASSERT(obd != NULL);
480 LPROCFS_CLIMP_CHECK(obd);
481 imp = obd->u.cli.cl_import;
482 ocd = &imp->imp_connect_data;
484 seq_printf(m, "imperative_recovery: %s\n",
485 OCD_HAS_FLAG(ocd, IMP_RECOV) ? "ENABLED" : "DISABLED");
486 seq_printf(m, "client_state:\n");
488 spin_lock(&config_list_lock);
489 list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
490 if (cld->cld_recover == NULL)
492 seq_printf(m, " - { client: %s, nidtbl_version: %u }\n",
494 cld->cld_recover->cld_cfg.cfg_last_idx);
496 spin_unlock(&config_list_lock);
498 LPROCFS_CLIMP_EXIT(obd);
503 /* reenqueue any lost locks */
504 #define RQ_RUNNING 0x1
508 #define RQ_PRECLEANUP 0x10
509 static int rq_state = 0;
510 static wait_queue_head_t rq_waitq;
511 static DECLARE_COMPLETION(rq_exit);
512 static DECLARE_COMPLETION(rq_start);
514 static void do_requeue(struct config_llog_data *cld)
519 LASSERT(atomic_read(&cld->cld_refcount) > 0);
521 /* Do not run mgc_process_log on a disconnected export or an
522 * export which is being disconnected. Take the client
523 * semaphore to make the check non-racy. */
524 down_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
525 if (cld->cld_mgcexp->exp_obd->u.cli.cl_conn_count != 0) {
526 CDEBUG(D_MGC, "updating log %s\n", cld->cld_logname);
527 rc = mgc_process_log(cld->cld_mgcexp->exp_obd, cld);
528 if (rc && rc != -ENOENT)
529 CERROR("failed processing log: %d\n", rc);
531 CDEBUG(D_MGC, "disconnecting, won't update log %s\n",
534 up_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
539 /* this timeout represents how many seconds MGC should wait before
540 * requeue config and recover lock to the MGS. We need to randomize this
541 * in order to not flood the MGS.
543 #define MGC_TIMEOUT_MIN_SECONDS 5
544 #define MGC_TIMEOUT_RAND_CENTISEC 0x1ff /* ~500 */
546 static int mgc_requeue_thread(void *data)
552 CDEBUG(D_MGC, "Starting requeue thread\n");
554 /* Keep trying failed locks periodically */
555 spin_lock(&config_list_lock);
556 rq_state |= RQ_RUNNING;
558 struct l_wait_info lwi;
559 struct config_llog_data *cld, *cld_prev;
560 int rand = cfs_rand() & MGC_TIMEOUT_RAND_CENTISEC;
561 int stopped = !!(rq_state & RQ_STOP);
564 /* Any new or requeued lostlocks will change the state */
565 rq_state &= ~(RQ_NOW | RQ_LATER);
566 spin_unlock(&config_list_lock);
573 /* Always wait a few seconds to allow the server who
574 caused the lock revocation to finish its setup, plus some
575 random so everyone doesn't try to reconnect at once. */
576 to = msecs_to_jiffies(MGC_TIMEOUT_MIN_SECONDS * MSEC_PER_SEC);
577 /* rand is centi-seconds */
578 to += msecs_to_jiffies(rand * MSEC_PER_SEC / 100);
579 lwi = LWI_TIMEOUT(to, NULL, NULL);
580 l_wait_event(rq_waitq, rq_state & (RQ_STOP | RQ_PRECLEANUP),
584 * iterate & processing through the list. for each cld, process
585 * its depending sptlrpc cld firstly (if any) and then itself.
587 * it's guaranteed any item in the list must have
588 * reference > 0; and if cld_lostlock is set, at
589 * least one reference is taken by the previous enqueue.
593 spin_lock(&config_list_lock);
594 rq_state &= ~RQ_PRECLEANUP;
595 list_for_each_entry(cld, &config_llog_list,
597 if (!cld->cld_lostlock)
600 spin_unlock(&config_list_lock);
602 LASSERT(atomic_read(&cld->cld_refcount) > 0);
604 /* Whether we enqueued again or not in mgc_process_log,
605 * we're done with the ref from the old enqueue */
607 config_log_put(cld_prev);
610 cld->cld_lostlock = 0;
611 if (likely(!stopped))
614 spin_lock(&config_list_lock);
616 spin_unlock(&config_list_lock);
618 config_log_put(cld_prev);
620 /* break after scanning the list so that we can drop
621 * refcount to losing lock clds */
622 if (unlikely(stopped)) {
623 spin_lock(&config_list_lock);
627 /* Wait a bit to see if anyone else needs a requeue */
628 lwi = (struct l_wait_info) { 0 };
629 l_wait_event(rq_waitq, rq_state & (RQ_NOW | RQ_STOP),
631 spin_lock(&config_list_lock);
633 /* spinlock and while guarantee RQ_NOW and RQ_LATER are not set */
634 rq_state &= ~RQ_RUNNING;
635 spin_unlock(&config_list_lock);
639 CDEBUG(D_MGC, "Ending requeue thread\n");
643 /* Add a cld to the list to requeue. Start the requeue thread if needed.
644 We are responsible for dropping the config log reference from here on out. */
645 static void mgc_requeue_add(struct config_llog_data *cld)
649 CDEBUG(D_INFO, "log %s: requeue (r=%d sp=%d st=%x)\n",
650 cld->cld_logname, atomic_read(&cld->cld_refcount),
651 cld->cld_stopping, rq_state);
652 LASSERT(atomic_read(&cld->cld_refcount) > 0);
654 mutex_lock(&cld->cld_lock);
655 if (cld->cld_stopping || cld->cld_lostlock) {
656 mutex_unlock(&cld->cld_lock);
659 /* this refcount will be released in mgc_requeue_thread. */
661 cld->cld_lostlock = 1;
662 mutex_unlock(&cld->cld_lock);
664 /* Hold lock for rq_state */
665 spin_lock(&config_list_lock);
666 if (rq_state & RQ_STOP) {
667 spin_unlock(&config_list_lock);
668 cld->cld_lostlock = 0;
672 spin_unlock(&config_list_lock);
678 /********************** class fns **********************/
679 static int mgc_local_llog_init(const struct lu_env *env,
680 struct obd_device *obd,
681 struct obd_device *disk)
683 struct llog_ctxt *ctxt;
688 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CONFIG_ORIG_CTXT, disk,
693 ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
695 ctxt->loc_dir = obd->u.cli.cl_mgc_configs_dir;
701 static int mgc_local_llog_fini(const struct lu_env *env,
702 struct obd_device *obd)
704 struct llog_ctxt *ctxt;
708 ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
709 llog_cleanup(env, ctxt);
714 static int mgc_fs_setup(const struct lu_env *env, struct obd_device *obd,
715 struct super_block *sb)
717 struct lustre_sb_info *lsi = s2lsi(sb);
718 struct client_obd *cli = &obd->u.cli;
719 struct lu_fid rfid, fid;
720 struct dt_object *root, *dto;
726 LASSERT(lsi->lsi_dt_dev);
728 /* The mgc fs exclusion mutex. Only one fs can be setup at a time. */
729 mutex_lock(&cli->cl_mgc_mutex);
731 /* Setup the configs dir */
732 fid.f_seq = FID_SEQ_LOCAL_NAME;
735 rc = local_oid_storage_init(env, lsi->lsi_dt_dev, &fid,
740 rc = dt_root_get(env, lsi->lsi_dt_dev, &rfid);
744 root = dt_locate_at(env, lsi->lsi_dt_dev, &rfid,
745 &cli->cl_mgc_los->los_dev->dd_lu_dev, NULL);
746 if (unlikely(IS_ERR(root)))
747 GOTO(out_los, rc = PTR_ERR(root));
749 dto = local_file_find_or_create(env, cli->cl_mgc_los, root,
751 S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO);
752 lu_object_put_nocache(env, &root->do_lu);
754 GOTO(out_los, rc = PTR_ERR(dto));
756 cli->cl_mgc_configs_dir = dto;
758 LASSERT(lsi->lsi_osd_exp->exp_obd->obd_lvfs_ctxt.dt);
759 rc = mgc_local_llog_init(env, obd, lsi->lsi_osd_exp->exp_obd);
763 /* We take an obd ref to insure that we can't get to mgc_cleanup
764 * without calling mgc_fs_cleanup first. */
765 class_incref(obd, "mgc_fs", obd);
767 /* We keep the cl_mgc_sem until mgc_fs_cleanup */
771 lu_object_put(env, &cli->cl_mgc_configs_dir->do_lu);
772 cli->cl_mgc_configs_dir = NULL;
776 local_oid_storage_fini(env, cli->cl_mgc_los);
777 cli->cl_mgc_los = NULL;
778 mutex_unlock(&cli->cl_mgc_mutex);
783 static int mgc_fs_cleanup(const struct lu_env *env, struct obd_device *obd)
785 struct client_obd *cli = &obd->u.cli;
788 LASSERT(cli->cl_mgc_los != NULL);
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;
798 class_decref(obd, "mgc_fs", obd);
799 mutex_unlock(&cli->cl_mgc_mutex);
804 static int mgc_llog_init(const struct lu_env *env, struct obd_device *obd)
806 struct llog_ctxt *ctxt;
811 /* setup only remote ctxt, the local disk context is switched per each
812 * filesystem during mgc_fs_setup() */
813 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_CONFIG_REPL_CTXT, obd,
818 ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
821 llog_initiator_connect(ctxt);
827 static int mgc_llog_fini(const struct lu_env *env, struct obd_device *obd)
829 struct llog_ctxt *ctxt;
833 ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
835 llog_cleanup(env, ctxt);
841 static atomic_t mgc_count = ATOMIC_INIT(0);
842 static int mgc_precleanup(struct obd_device *obd)
848 if (atomic_dec_and_test(&mgc_count)) {
849 LASSERT(rq_state & RQ_RUNNING);
850 /* stop requeue thread */
853 /* wakeup requeue thread to clean our cld */
854 temp = RQ_NOW | RQ_PRECLEANUP;
857 spin_lock(&config_list_lock);
859 spin_unlock(&config_list_lock);
863 wait_for_completion(&rq_exit);
864 obd_cleanup_client_import(obd);
866 rc = mgc_llog_fini(NULL, obd);
868 CERROR("failed to cleanup llogging subsystems\n");
873 static int mgc_cleanup(struct obd_device *obd)
878 /* COMPAT_146 - old config logs may have added profiles we don't
880 if (obd->obd_type->typ_refcnt <= 1)
881 /* Only for the last mgc */
882 class_del_profiles();
884 lprocfs_obd_cleanup(obd);
887 rc = client_obd_cleanup(obd);
891 static int mgc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
893 struct task_struct *task;
897 rc = ptlrpcd_addref();
901 rc = client_obd_setup(obd, lcfg);
903 GOTO(err_decref, rc);
905 rc = mgc_llog_init(NULL, obd);
907 CERROR("failed to setup llogging subsystems\n");
908 GOTO(err_cleanup, rc);
911 #ifdef CONFIG_PROC_FS
912 obd->obd_vars = lprocfs_mgc_obd_vars;
913 lprocfs_obd_setup(obd);
915 sptlrpc_lprocfs_cliobd_attach(obd);
917 if (atomic_inc_return(&mgc_count) == 1) {
919 init_waitqueue_head(&rq_waitq);
921 /* start requeue thread */
922 task = kthread_run(mgc_requeue_thread, NULL, "ll_cfg_requeue");
925 CERROR("%s: cannot start requeue thread: rc = %d; "
926 "no more log updates\n",
928 GOTO(err_cleanup, rc);
930 /* rc is the task_struct pointer of mgc_requeue_thread. */
932 wait_for_completion(&rq_start);
938 client_obd_cleanup(obd);
944 /* based on ll_mdc_blocking_ast */
945 static int mgc_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
946 void *data, int flag)
948 struct lustre_handle lockh;
949 struct config_llog_data *cld = (struct config_llog_data *)data;
954 case LDLM_CB_BLOCKING:
955 /* mgs wants the lock, give it up... */
956 LDLM_DEBUG(lock, "MGC blocking CB");
957 ldlm_lock2handle(lock, &lockh);
958 rc = ldlm_cli_cancel(&lockh, LCF_ASYNC);
960 case LDLM_CB_CANCELING:
961 /* We've given up the lock, prepare ourselves to update. */
962 LDLM_DEBUG(lock, "MGC cancel CB");
964 CDEBUG(D_MGC, "Lock res "DLDLMRES" (%.8s)\n",
965 PLDLMRES(lock->l_resource),
966 (char *)&lock->l_resource->lr_name.name[0]);
969 CDEBUG(D_INFO, "missing data, won't requeue\n");
973 /* held at mgc_process_log(). */
974 LASSERT(atomic_read(&cld->cld_refcount) > 0);
975 /* Are we done with this log? */
976 if (cld->cld_stopping) {
977 CDEBUG(D_MGC, "log %s: stopping, won't requeue\n",
982 /* Make sure not to re-enqueue when the mgc is stopping
983 (we get called from client_disconnect_export) */
984 if (lock->l_conn_export == NULL ||
985 lock->l_conn_export->exp_obd->u.cli.cl_conn_count == 0) {
986 CDEBUG(D_MGC, "log %.8s: disconnecting, won't requeue\n",
993 mgc_requeue_add(cld);
1003 /* Not sure where this should go... */
1004 /* This is the timeout value for MGS_CONNECT request plus a ping interval, such
1005 * that we can have a chance to try the secondary MGS if any. */
1006 #define MGC_ENQUEUE_LIMIT (INITIAL_CONNECT_TIMEOUT + (AT_OFF ? 0 : at_min) \
1008 #define MGC_TARGET_REG_LIMIT 10
1009 #define MGC_SEND_PARAM_LIMIT 10
1011 /* Send parameter to MGS*/
1012 static int mgc_set_mgs_param(struct obd_export *exp,
1013 struct mgs_send_param *msp)
1015 struct ptlrpc_request *req;
1016 struct mgs_send_param *req_msp, *rep_msp;
1020 req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
1021 &RQF_MGS_SET_INFO, LUSTRE_MGS_VERSION,
1026 req_msp = req_capsule_client_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
1028 ptlrpc_req_finished(req);
1032 memcpy(req_msp, msp, sizeof(*req_msp));
1033 ptlrpc_request_set_replen(req);
1035 /* Limit how long we will wait for the enqueue to complete */
1036 req->rq_delay_limit = MGC_SEND_PARAM_LIMIT;
1037 rc = ptlrpc_queue_wait(req);
1039 rep_msp = req_capsule_server_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
1040 memcpy(msp, rep_msp, sizeof(*rep_msp));
1043 ptlrpc_req_finished(req);
1048 /* Take a config lock so we can get cancel notifications */
1049 static int mgc_enqueue(struct obd_export *exp, enum ldlm_type type,
1050 union ldlm_policy_data *policy, enum ldlm_mode mode,
1051 __u64 *flags, void *bl_cb, void *cp_cb, void *gl_cb,
1052 void *data, __u32 lvb_len, void *lvb_swabber,
1053 struct lustre_handle *lockh)
1055 struct config_llog_data *cld = (struct config_llog_data *)data;
1056 struct ldlm_enqueue_info einfo = {
1059 .ei_cb_bl = mgc_blocking_ast,
1060 .ei_cb_cp = ldlm_completion_ast,
1062 struct ptlrpc_request *req;
1063 int short_limit = cld_is_sptlrpc(cld);
1067 CDEBUG(D_MGC, "Enqueue for %s (res "LPX64")\n", cld->cld_logname,
1068 cld->cld_resid.name[0]);
1070 /* We need a callback for every lockholder, so don't try to
1071 ldlm_lock_match (see rev 1.1.2.11.2.47) */
1072 req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
1073 &RQF_LDLM_ENQUEUE, LUSTRE_DLM_VERSION,
1078 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER, 0);
1079 ptlrpc_request_set_replen(req);
1081 /* check if this is server or client */
1082 if (cld->cld_cfg.cfg_sb) {
1083 struct lustre_sb_info *lsi = s2lsi(cld->cld_cfg.cfg_sb);
1084 if (lsi && IS_SERVER(lsi))
1087 /* Limit how long we will wait for the enqueue to complete */
1088 req->rq_delay_limit = short_limit ? 5 : MGC_ENQUEUE_LIMIT;
1089 rc = ldlm_cli_enqueue(exp, &req, &einfo, &cld->cld_resid, NULL, flags,
1090 NULL, 0, LVB_T_NONE, lockh, 0);
1091 /* A failed enqueue should still call the mgc_blocking_ast,
1092 where it will be requeued if needed ("grant failed"). */
1093 ptlrpc_req_finished(req);
1097 static int mgc_cancel(struct obd_export *exp, enum ldlm_mode mode,
1098 struct lustre_handle *lockh)
1102 ldlm_lock_decref(lockh, mode);
1107 static void mgc_notify_active(struct obd_device *unused)
1109 /* wakeup mgc_requeue_thread to requeue mgc lock */
1110 spin_lock(&config_list_lock);
1112 spin_unlock(&config_list_lock);
1115 /* TODO: Help the MGS rebuild nidtbl. -jay */
1118 /* Send target_reg message to MGS */
1119 static int mgc_target_register(struct obd_export *exp,
1120 struct mgs_target_info *mti)
1122 struct ptlrpc_request *req;
1123 struct mgs_target_info *req_mti, *rep_mti;
1127 req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
1128 &RQF_MGS_TARGET_REG, LUSTRE_MGS_VERSION,
1133 req_mti = req_capsule_client_get(&req->rq_pill, &RMF_MGS_TARGET_INFO);
1135 ptlrpc_req_finished(req);
1139 memcpy(req_mti, mti, sizeof(*req_mti));
1140 ptlrpc_request_set_replen(req);
1141 CDEBUG(D_MGC, "register %s\n", mti->mti_svname);
1142 /* Limit how long we will wait for the enqueue to complete */
1143 req->rq_delay_limit = MGC_TARGET_REG_LIMIT;
1145 rc = ptlrpc_queue_wait(req);
1147 rep_mti = req_capsule_server_get(&req->rq_pill,
1148 &RMF_MGS_TARGET_INFO);
1149 memcpy(mti, rep_mti, sizeof(*rep_mti));
1150 CDEBUG(D_MGC, "register %s got index = %d\n",
1151 mti->mti_svname, mti->mti_stripe_index);
1153 ptlrpc_req_finished(req);
1158 static int mgc_set_info_async(const struct lu_env *env, struct obd_export *exp,
1159 u32 keylen, void *key,
1160 u32 vallen, void *val,
1161 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(env, exp->exp_obd, sb);
1204 if (KEY_IS(KEY_CLEAR_FS)) {
1207 rc = mgc_fs_cleanup(env, 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)
1269 if (KEY_IS(KEY_CONN_DATA)) {
1270 struct obd_import *imp = class_exp2cliimp(exp);
1271 struct obd_connect_data *data = val;
1273 if (*vallen == sizeof(*data)) {
1274 *data = imp->imp_connect_data;
1282 static int mgc_import_event(struct obd_device *obd,
1283 struct obd_import *imp,
1284 enum obd_import_event event)
1288 LASSERT(imp->imp_obd == obd);
1289 CDEBUG(D_MGC, "import event %#x\n", event);
1292 case IMP_EVENT_DISCON:
1293 /* MGC imports should not wait for recovery */
1294 if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV))
1295 ptlrpc_pinger_ir_down();
1297 case IMP_EVENT_INACTIVE:
1299 case IMP_EVENT_INVALIDATE: {
1300 struct ldlm_namespace *ns = obd->obd_namespace;
1301 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
1304 case IMP_EVENT_ACTIVE:
1305 CDEBUG(D_INFO, "%s: Reactivating import\n", obd->obd_name);
1306 /* Clearing obd_no_recov allows us to continue pinging */
1307 obd->obd_no_recov = 0;
1308 mgc_notify_active(obd);
1309 if (OCD_HAS_FLAG(&imp->imp_connect_data, IMP_RECOV))
1310 ptlrpc_pinger_ir_up();
1314 case IMP_EVENT_DEACTIVATE:
1315 case IMP_EVENT_ACTIVATE:
1318 CERROR("Unknown import event %#x\n", event);
1325 CONFIG_READ_NRPAGES_INIT = 1 << (20 - PAGE_CACHE_SHIFT),
1326 CONFIG_READ_NRPAGES = 4
1329 static int mgc_apply_recover_logs(struct obd_device *mgc,
1330 struct config_llog_data *cld,
1332 void *data, int datalen, bool mne_swab)
1334 struct config_llog_instance *cfg = &cld->cld_cfg;
1335 struct lustre_sb_info *lsi = s2lsi(cfg->cfg_sb);
1336 struct mgs_nidtbl_entry *entry;
1337 struct lustre_cfg *lcfg;
1338 struct lustre_cfg_bufs bufs;
1339 u64 prev_version = 0;
1348 LASSERT(cfg->cfg_instance != NULL);
1349 LASSERT(cfg->cfg_sb == cfg->cfg_instance);
1351 OBD_ALLOC(inst, PAGE_CACHE_SIZE);
1355 if (!IS_SERVER(lsi)) {
1356 pos = snprintf(inst, PAGE_CACHE_SIZE, "%p", cfg->cfg_instance);
1357 if (pos >= PAGE_CACHE_SIZE) {
1358 OBD_FREE(inst, PAGE_CACHE_SIZE);
1362 LASSERT(IS_MDT(lsi));
1363 rc = server_name2svname(lsi->lsi_svname, inst, NULL,
1366 OBD_FREE(inst, PAGE_CACHE_SIZE);
1374 bufsz = PAGE_CACHE_SIZE - pos;
1376 while (datalen > 0) {
1377 int entry_len = sizeof(*entry);
1379 struct obd_device *obd;
1386 if (datalen < sizeof(*entry))
1389 entry = (typeof(entry))(data + off);
1392 if (entry->mne_nid_type != 0) /* only support type 0 for ipv4 */
1394 if (entry->mne_nid_count == 0) /* at least one nid entry */
1396 if (entry->mne_nid_size != sizeof(lnet_nid_t))
1399 entry_len += entry->mne_nid_count * entry->mne_nid_size;
1400 if (datalen < entry_len) /* must have entry_len at least */
1403 /* Keep this swab for normal mixed endian handling. LU-1644 */
1405 lustre_swab_mgs_nidtbl_entry(entry);
1406 if (entry->mne_length > PAGE_CACHE_SIZE) {
1407 CERROR("MNE too large (%u)\n", entry->mne_length);
1411 if (entry->mne_length < entry_len)
1414 off += entry->mne_length;
1415 datalen -= entry->mne_length;
1419 if (entry->mne_version > max_version) {
1420 CERROR("entry index(%lld) is over max_index(%lld)\n",
1421 entry->mne_version, max_version);
1425 if (prev_version >= entry->mne_version) {
1426 CERROR("index unsorted, prev %lld, now %lld\n",
1427 prev_version, entry->mne_version);
1430 prev_version = entry->mne_version;
1433 * Write a string with format "nid::instance" to
1434 * lustre/<osc|mdc>/<target>-<osc|mdc>-<instance>/import.
1437 is_ost = entry->mne_type == LDD_F_SV_TYPE_OST;
1438 memset(buf, 0, bufsz);
1442 /* lustre-OST0001-osc-<instance #> */
1443 strcpy(obdname, cld->cld_logname);
1444 cname = strrchr(obdname, '-');
1445 if (cname == NULL) {
1446 CERROR("mgc %s: invalid logname %s\n",
1447 mgc->obd_name, obdname);
1451 pos = cname - obdname;
1453 pos += sprintf(obdname + pos, "-%s%04x",
1454 is_ost ? "OST" : "MDT", entry->mne_index);
1456 cname = is_ost ? "osc" : "mdc",
1457 pos += sprintf(obdname + pos, "-%s-%s", cname, inst);
1458 lustre_cfg_bufs_reset(&bufs, obdname);
1460 /* find the obd by obdname */
1461 obd = class_name2obd(obdname);
1463 CDEBUG(D_INFO, "mgc %s: cannot find obdname %s\n",
1464 mgc->obd_name, obdname);
1466 /* this is a safe race, when the ost is starting up...*/
1470 /* osc.import = "connection=<Conn UUID>::<target instance>" */
1473 pos += sprintf(params, "%s.import=%s", cname, "connection=");
1476 down_read(&obd->u.cli.cl_sem);
1477 if (obd->u.cli.cl_import == NULL) {
1478 /* client does not connect to the OST yet */
1479 up_read(&obd->u.cli.cl_sem);
1484 /* iterate all nids to find one */
1485 /* find uuid by nid */
1487 for (i = 0; i < entry->mne_nid_count; i++) {
1488 rc = client_import_find_conn(obd->u.cli.cl_import,
1490 (struct obd_uuid *)uuid);
1495 up_read(&obd->u.cli.cl_sem);
1497 CERROR("mgc: cannot find uuid by nid %s\n",
1498 libcfs_nid2str(entry->u.nids[0]));
1502 CDEBUG(D_INFO, "Find uuid %s by nid %s\n",
1503 uuid, libcfs_nid2str(entry->u.nids[0]));
1505 pos += strlen(uuid);
1506 pos += sprintf(buf + pos, "::%u", entry->mne_instance);
1507 LASSERT(pos < bufsz);
1509 lustre_cfg_bufs_set_string(&bufs, 1, params);
1511 lcfg = lustre_cfg_new(LCFG_PARAM, &bufs);
1517 CDEBUG(D_INFO, "ir apply logs "LPD64"/"LPD64" for %s -> %s\n",
1518 prev_version, max_version, obdname, params);
1520 rc = class_process_config(lcfg);
1521 lustre_cfg_free(lcfg);
1523 CDEBUG(D_INFO, "process config for %s error %d\n",
1526 /* continue, even one with error */
1529 OBD_FREE(inst, PAGE_CACHE_SIZE);
1534 * This function is called if this client was notified for target restarting
1535 * by the MGS. A CONFIG_READ RPC is going to send to fetch recovery logs.
1537 static int mgc_process_recover_log(struct obd_device *obd,
1538 struct config_llog_data *cld)
1540 struct ptlrpc_request *req = NULL;
1541 struct config_llog_instance *cfg = &cld->cld_cfg;
1542 struct mgs_config_body *body;
1543 struct mgs_config_res *res;
1544 struct ptlrpc_bulk_desc *desc;
1545 struct page **pages;
1548 bool mne_swab = false;
1554 /* allocate buffer for bulk transfer.
1555 * if this is the first time for this mgs to read logs,
1556 * CONFIG_READ_NRPAGES_INIT will be used since it will read all logs
1557 * once; otherwise, it only reads increment of logs, this should be
1558 * small and CONFIG_READ_NRPAGES will be used.
1560 nrpages = CONFIG_READ_NRPAGES;
1561 if (cfg->cfg_last_idx == 0) /* the first time */
1562 nrpages = CONFIG_READ_NRPAGES_INIT;
1564 OBD_ALLOC(pages, sizeof(*pages) * nrpages);
1566 GOTO(out, rc = -ENOMEM);
1568 for (i = 0; i < nrpages; i++) {
1569 pages[i] = alloc_page(GFP_KERNEL);
1570 if (pages[i] == NULL)
1571 GOTO(out, rc = -ENOMEM);
1575 LASSERT(cld_is_recover(cld));
1576 LASSERT(mutex_is_locked(&cld->cld_lock));
1577 req = ptlrpc_request_alloc(class_exp2cliimp(cld->cld_mgcexp),
1578 &RQF_MGS_CONFIG_READ);
1580 GOTO(out, rc = -ENOMEM);
1582 rc = ptlrpc_request_pack(req, LUSTRE_MGS_VERSION, MGS_CONFIG_READ);
1587 body = req_capsule_client_get(&req->rq_pill, &RMF_MGS_CONFIG_BODY);
1588 LASSERT(body != NULL);
1589 LASSERT(sizeof(body->mcb_name) > strlen(cld->cld_logname));
1590 if (strlcpy(body->mcb_name, cld->cld_logname, sizeof(body->mcb_name))
1591 >= sizeof(body->mcb_name))
1592 GOTO(out, rc = -E2BIG);
1593 body->mcb_offset = cfg->cfg_last_idx + 1;
1594 body->mcb_type = cld->cld_type;
1595 body->mcb_bits = PAGE_CACHE_SHIFT;
1596 body->mcb_units = nrpages;
1598 /* allocate bulk transfer descriptor */
1599 desc = ptlrpc_prep_bulk_imp(req, nrpages, 1,
1600 PTLRPC_BULK_PUT_SINK | PTLRPC_BULK_BUF_KIOV,
1602 &ptlrpc_bulk_kiov_pin_ops);
1604 GOTO(out, rc = -ENOMEM);
1606 for (i = 0; i < nrpages; i++)
1607 desc->bd_frag_ops->add_kiov_frag(desc, pages[i], 0,
1610 ptlrpc_request_set_replen(req);
1611 rc = ptlrpc_queue_wait(req);
1615 res = req_capsule_server_get(&req->rq_pill, &RMF_MGS_CONFIG_RES);
1616 if (res->mcr_size < res->mcr_offset)
1617 GOTO(out, rc = -EINVAL);
1619 /* always update the index even though it might have errors with
1620 * handling the recover logs */
1621 cfg->cfg_last_idx = res->mcr_offset;
1622 eof = res->mcr_offset == res->mcr_size;
1624 CDEBUG(D_INFO, "Latest version "LPD64", more %d.\n",
1625 res->mcr_offset, eof == false);
1627 ealen = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, 0);
1629 GOTO(out, rc = ealen);
1631 if (ealen > nrpages << PAGE_CACHE_SHIFT)
1632 GOTO(out, rc = -EINVAL);
1634 if (ealen == 0) { /* no logs transferred */
1640 mne_swab = !!ptlrpc_rep_need_swab(req);
1641 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1642 /* This import flag means the server did an extra swab of IR MNE
1643 * records (fixed in LU-1252), reverse it here if needed. LU-1644 */
1644 if (unlikely(req->rq_import->imp_need_mne_swab))
1645 mne_swab = !mne_swab;
1648 for (i = 0; i < nrpages && ealen > 0; i++) {
1652 ptr = kmap(pages[i]);
1653 rc2 = mgc_apply_recover_logs(obd, cld, res->mcr_offset, ptr,
1654 min_t(int, ealen, PAGE_CACHE_SIZE),
1658 CWARN("Process recover log %s error %d\n",
1659 cld->cld_logname, rc2);
1663 ealen -= PAGE_CACHE_SIZE;
1668 ptlrpc_req_finished(req);
1670 if (rc == 0 && !eof)
1674 for (i = 0; i < nrpages; i++) {
1675 if (pages[i] == NULL)
1677 __free_page(pages[i]);
1679 OBD_FREE(pages, sizeof(*pages) * nrpages);
1684 /* Copy a remote log locally */
1685 static int mgc_llog_local_copy(const struct lu_env *env,
1686 struct obd_device *obd,
1687 struct llog_ctxt *rctxt,
1688 struct llog_ctxt *lctxt, char *logname)
1696 * - copy it to backup using llog_backup()
1697 * - copy remote llog to logname using llog_backup()
1698 * - if failed then move bakup to logname again
1701 OBD_ALLOC(temp_log, strlen(logname) + 2);
1704 sprintf(temp_log, "%sT", logname);
1706 /* make a copy of local llog at first */
1707 rc = llog_backup(env, obd, lctxt, lctxt, logname, temp_log);
1708 if (rc < 0 && rc != -ENOENT)
1710 /* copy remote llog to the local copy */
1711 rc = llog_backup(env, obd, rctxt, lctxt, logname, logname);
1712 if (rc == -ENOENT) {
1713 /* no remote llog, delete local one too */
1714 llog_erase(env, lctxt, NULL, logname);
1715 } else if (rc < 0) {
1716 /* error during backup, get local one back from the copy */
1717 llog_backup(env, obd, lctxt, lctxt, temp_log, logname);
1719 CERROR("%s: failed to copy remote log %s: rc = %d\n",
1720 obd->obd_name, logname, rc);
1722 llog_erase(env, lctxt, NULL, temp_log);
1723 OBD_FREE(temp_log, strlen(logname) + 2);
1727 /* local_only means it cannot get remote llogs */
1728 static int mgc_process_cfg_log(struct obd_device *mgc,
1729 struct config_llog_data *cld, int local_only)
1731 struct llog_ctxt *ctxt, *lctxt = NULL;
1732 struct client_obd *cli = &mgc->u.cli;
1733 struct lustre_sb_info *lsi = NULL;
1735 bool sptlrpc_started = false;
1741 LASSERT(mutex_is_locked(&cld->cld_lock));
1744 * local copy of sptlrpc log is controlled elsewhere, don't try to
1747 if (cld_is_sptlrpc(cld) && local_only)
1750 if (cld->cld_cfg.cfg_sb)
1751 lsi = s2lsi(cld->cld_cfg.cfg_sb);
1757 rc = lu_env_init(env, LCT_MG_THREAD);
1761 ctxt = llog_get_context(mgc, LLOG_CONFIG_REPL_CTXT);
1764 lctxt = llog_get_context(mgc, LLOG_CONFIG_ORIG_CTXT);
1766 /* Copy the setup log locally if we can. Don't mess around if we're
1767 * running an MGS though (logs are already local). */
1768 if (lctxt && lsi && IS_SERVER(lsi) && !IS_MGS(lsi) &&
1769 cli->cl_mgc_configs_dir != NULL &&
1770 lu2dt_dev(cli->cl_mgc_configs_dir->do_lu.lo_dev) ==
1773 /* Only try to copy log if we have the lock. */
1774 rc = mgc_llog_local_copy(env, mgc, ctxt, lctxt,
1776 if (local_only || rc) {
1777 if (strcmp(cld->cld_logname, PARAMS_FILENAME) != 0 &&
1778 llog_is_empty(env, lctxt, cld->cld_logname)) {
1779 LCONSOLE_ERROR_MSG(0x13a, "Failed to get MGS "
1780 "log %s and no local copy."
1781 "\n", cld->cld_logname);
1782 GOTO(out_pop, rc = -ENOENT);
1784 CDEBUG(D_MGC, "Failed to get MGS log %s, using local "
1785 "copy for now, will try to update later.\n",
1789 /* Now, whether we copied or not, start using the local llog.
1790 * If we failed to copy, we'll start using whatever the old
1792 llog_ctxt_put(ctxt);
1796 if (local_only) /* no local log at client side */
1797 GOTO(out_pop, rc = -EIO);
1800 if (cld_is_sptlrpc(cld)) {
1801 sptlrpc_conf_log_update_begin(cld->cld_logname);
1802 sptlrpc_started = true;
1805 /* logname and instance info should be the same, so use our
1806 * copy of the instance for the update. The cfg_last_idx will
1807 * be updated here. */
1808 rc = class_config_parse_llog(env, ctxt, cld->cld_logname,
1813 __llog_ctxt_put(env, ctxt);
1815 __llog_ctxt_put(env, lctxt);
1818 * update settings on existing OBDs. doing it inside
1819 * of llog_process_lock so no device is attaching/detaching
1821 * the logname must be <fsname>-sptlrpc
1823 if (sptlrpc_started) {
1824 LASSERT(cld_is_sptlrpc(cld));
1825 sptlrpc_conf_log_update_end(cld->cld_logname);
1826 class_notify_sptlrpc_conf(cld->cld_logname,
1827 strlen(cld->cld_logname) -
1828 strlen("-sptlrpc"));
1837 static bool mgc_import_in_recovery(struct obd_import *imp)
1839 bool in_recovery = true;
1841 spin_lock(&imp->imp_lock);
1842 if (imp->imp_state == LUSTRE_IMP_FULL ||
1843 imp->imp_state == LUSTRE_IMP_CLOSED)
1844 in_recovery = false;
1845 spin_unlock(&imp->imp_lock);
1851 * Get a configuration log from the MGS and process it.
1853 * This function is called for both clients and servers to process the
1854 * configuration log from the MGS. The MGC enqueues a DLM lock on the
1855 * log from the MGS, and if the lock gets revoked the MGC will be notified
1856 * by the lock cancellation callback that the config log has changed,
1857 * and will enqueue another MGS lock on it, and then continue processing
1858 * the new additions to the end of the log.
1860 * Since the MGC import is not replayable, if the import is being evicted
1861 * (rcl == -ESHUTDOWN, \see ptlrpc_import_delay_req()), retry to process
1862 * the log until recovery is finished or the import is closed.
1864 * Make a local copy of the log before parsing it if appropriate (non-MGS
1865 * server) so that the server can start even when the MGS is down.
1867 * There shouldn't be multiple processes running process_log at once --
1868 * sounds like badness. It actually might be fine, as long as they're not
1869 * trying to update from the same log simultaneously, in which case we
1870 * should use a per-log semaphore instead of cld_lock.
1872 * \param[in] mgc MGC device by which to fetch the configuration log
1873 * \param[in] cld log processing state (stored in lock callback data)
1875 * \retval 0 on success
1876 * \retval negative errno on failure
1878 int mgc_process_log(struct obd_device *mgc, struct config_llog_data *cld)
1880 struct lustre_handle lockh = { 0 };
1881 __u64 flags = LDLM_FL_NO_LRU;
1886 LASSERT(cld != NULL);
1888 /* I don't want multiple processes running process_log at once --
1889 sounds like badness. It actually might be fine, as long as
1890 we're not trying to update from the same log
1891 simultaneously (in which case we should use a per-log sem.) */
1893 mutex_lock(&cld->cld_lock);
1894 if (cld->cld_stopping) {
1895 mutex_unlock(&cld->cld_lock);
1899 OBD_FAIL_TIMEOUT(OBD_FAIL_MGC_PAUSE_PROCESS_LOG, 20);
1901 CDEBUG(D_MGC, "Process log %s:%p from %d\n", cld->cld_logname,
1902 cld->cld_cfg.cfg_instance, cld->cld_cfg.cfg_last_idx + 1);
1904 /* Get the cfg lock on the llog */
1905 rcl = mgc_enqueue(mgc->u.cli.cl_mgc_mgsexp, LDLM_PLAIN, NULL,
1906 LCK_CR, &flags, NULL, NULL, NULL,
1907 cld, 0, NULL, &lockh);
1909 /* Get the cld, it will be released in mgc_blocking_ast. */
1910 config_log_get(cld);
1911 rc = ldlm_lock_set_data(&lockh, (void *)cld);
1914 CDEBUG(D_MGC, "Can't get cfg lock: %d\n", rcl);
1916 if (rcl == -ESHUTDOWN &&
1917 atomic_read(&mgc->u.cli.cl_mgc_refcount) > 0 && !retry) {
1918 struct obd_import *imp;
1919 struct l_wait_info lwi;
1920 int secs = cfs_time_seconds(obd_timeout);
1922 mutex_unlock(&cld->cld_lock);
1923 imp = class_exp2cliimp(mgc->u.cli.cl_mgc_mgsexp);
1925 /* Let's force the pinger, and wait the import to be
1926 * connected, note: since mgc import is non-replayable,
1927 * and even the import state is disconnected, it does
1928 * not mean the "recovery" is stopped, so we will keep
1929 * waitting until timeout or the import state is
1931 ptlrpc_pinger_force(imp);
1933 lwi = LWI_TIMEOUT(secs, NULL, NULL);
1934 l_wait_event(imp->imp_recovery_waitq,
1935 !mgc_import_in_recovery(imp), &lwi);
1937 if (imp->imp_state == LUSTRE_IMP_FULL) {
1941 mutex_lock(&cld->cld_lock);
1942 cld->cld_lostlock = 1;
1945 /* mark cld_lostlock so that it will requeue
1946 * after MGC becomes available. */
1947 cld->cld_lostlock = 1;
1949 /* Get extra reference, it will be put in requeue thread */
1950 config_log_get(cld);
1954 if (cld_is_recover(cld)) {
1955 rc = 0; /* this is not a fatal error for recover log */
1957 rc = mgc_process_recover_log(mgc, cld);
1959 CERROR("%s: recover log %s failed: rc = %d"
1960 "not fatal.\n", mgc->obd_name,
1961 cld->cld_logname, rc);
1963 cld->cld_lostlock = 1;
1967 rc = mgc_process_cfg_log(mgc, cld, rcl != 0);
1970 CDEBUG(D_MGC, "%s: configuration from log '%s' %sed (%d).\n",
1971 mgc->obd_name, cld->cld_logname, rc ? "fail" : "succeed", rc);
1973 mutex_unlock(&cld->cld_lock);
1975 /* Now drop the lock so MGS can revoke it */
1977 rcl = mgc_cancel(mgc->u.cli.cl_mgc_mgsexp, LCK_CR, &lockh);
1979 CERROR("Can't drop cfg lock: %d\n", rcl);
1986 /** Called from lustre_process_log.
1987 * LCFG_LOG_START gets the config log from the MGS, processes it to start
1988 * any services, and adds it to the list logs to watch (follow).
1990 static int mgc_process_config(struct obd_device *obd, size_t len, void *buf)
1992 struct lustre_cfg *lcfg = buf;
1993 struct config_llog_instance *cfg = NULL;
1998 switch(lcfg->lcfg_command) {
1999 case LCFG_LOV_ADD_OBD: {
2000 /* Overloading this cfg command: register a new target */
2001 struct mgs_target_info *mti;
2003 if (LUSTRE_CFG_BUFLEN(lcfg, 1) !=
2004 sizeof(struct mgs_target_info))
2005 GOTO(out, rc = -EINVAL);
2007 mti = (struct mgs_target_info *)lustre_cfg_buf(lcfg, 1);
2008 CDEBUG(D_MGC, "add_target %s %#x\n",
2009 mti->mti_svname, mti->mti_flags);
2010 rc = mgc_target_register(obd->u.cli.cl_mgc_mgsexp, mti);
2013 case LCFG_LOV_DEL_OBD:
2014 /* Unregister has no meaning at the moment. */
2015 CERROR("lov_del_obd unimplemented\n");
2018 case LCFG_SPTLRPC_CONF: {
2019 rc = sptlrpc_process_config(lcfg);
2022 case LCFG_LOG_START: {
2023 struct config_llog_data *cld;
2024 struct super_block *sb;
2026 logname = lustre_cfg_string(lcfg, 1);
2027 cfg = (struct config_llog_instance *)lustre_cfg_buf(lcfg, 2);
2028 sb = *(struct super_block **)lustre_cfg_buf(lcfg, 3);
2030 CDEBUG(D_MGC, "parse_log %s from %d\n", logname,
2033 /* We're only called through here on the initial mount */
2034 rc = config_log_add(obd, logname, cfg, sb);
2037 cld = config_log_find(logname, cfg);
2044 /* FIXME only set this for old logs! Right now this forces
2045 us to always skip the "inside markers" check */
2046 cld->cld_cfg.cfg_flags |= CFG_F_COMPAT146;
2048 rc = mgc_process_log(obd, cld);
2049 if (rc == 0 && cld->cld_recover != NULL) {
2050 if (OCD_HAS_FLAG(&obd->u.cli.cl_import->
2051 imp_connect_data, IMP_RECOV)) {
2052 rc = mgc_process_log(obd, cld->cld_recover);
2054 struct config_llog_data *cir = cld->cld_recover;
2055 cld->cld_recover = NULL;
2056 config_log_put(cir);
2059 CERROR("Cannot process recover llog %d\n", rc);
2062 if (rc == 0 && cld->cld_params != NULL) {
2063 rc = mgc_process_log(obd, cld->cld_params);
2064 if (rc == -ENOENT) {
2065 CDEBUG(D_MGC, "There is no params "
2066 "config file yet\n");
2069 /* params log is optional */
2071 CERROR("%s: can't process params llog: rc = %d\n",
2074 config_log_put(cld);
2078 case LCFG_LOG_END: {
2079 logname = lustre_cfg_string(lcfg, 1);
2081 if (lcfg->lcfg_bufcount >= 2)
2082 cfg = (struct config_llog_instance *)lustre_cfg_buf(
2084 rc = config_log_end(logname, cfg);
2088 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
2089 GOTO(out, rc = -EINVAL);
2097 static struct obd_ops mgc_obd_ops = {
2098 .o_owner = THIS_MODULE,
2099 .o_setup = mgc_setup,
2100 .o_precleanup = mgc_precleanup,
2101 .o_cleanup = mgc_cleanup,
2102 .o_add_conn = client_import_add_conn,
2103 .o_del_conn = client_import_del_conn,
2104 .o_connect = client_connect_import,
2105 .o_disconnect = client_disconnect_export,
2106 .o_set_info_async = mgc_set_info_async,
2107 .o_get_info = mgc_get_info,
2108 .o_import_event = mgc_import_event,
2109 .o_process_config = mgc_process_config,
2112 static int __init mgc_init(void)
2114 return class_register_type(&mgc_obd_ops, NULL, true, NULL,
2115 LUSTRE_MGC_NAME, NULL);
2118 static void __exit mgc_exit(void)
2120 class_unregister_type(LUSTRE_MGC_NAME);
2123 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
2124 MODULE_DESCRIPTION("Lustre Management Client");
2125 MODULE_VERSION(LUSTRE_VERSION_STRING);
2126 MODULE_LICENSE("GPL");
2128 module_init(mgc_init);
2129 module_exit(mgc_exit);