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LU-1222 ldlm: Fix the race in AST sender vs multiple arriving RPCs
[fs/lustre-release.git] / lustre / mgc / mgc_request.c
1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=8:tabstop=8:
3  *
4  * GPL HEADER START
5  *
6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 only,
10  * as published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License version 2 for more details (a copy is included
16  * in the LICENSE file that accompanied this code).
17  *
18  * You should have received a copy of the GNU General Public License
19  * version 2 along with this program; If not, see
20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
21  *
22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23  * CA 95054 USA or visit www.sun.com if you need additional information or
24  * have any questions.
25  *
26  * GPL HEADER END
27  */
28 /*
29  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
30  * Use is subject to license terms.
31  *
32  * Copyright (c) 2011, Whamcloud, Inc.
33  */
34 /*
35  * This file is part of Lustre, http://www.lustre.org/
36  * Lustre is a trademark of Sun Microsystems, Inc.
37  *
38  * lustre/mgc/mgc_request.c
39  *
40  * Author: Nathan Rutman <nathan@clusterfs.com>
41  */
42
43 #ifndef EXPORT_SYMTAB
44 # define EXPORT_SYMTAB
45 #endif
46 #define DEBUG_SUBSYSTEM S_MGC
47 #define D_MGC D_CONFIG /*|D_WARNING*/
48
49 #ifdef __KERNEL__
50 # include <linux/module.h>
51 # include <linux/pagemap.h>
52 # include <linux/miscdevice.h>
53 # include <linux/init.h>
54 #else
55 # include <liblustre.h>
56 #endif
57
58 #include <obd_class.h>
59 #include <lustre_dlm.h>
60 #include <lprocfs_status.h>
61 #include <lustre_log.h>
62 #include <lustre_fsfilt.h>
63 #include <lustre_disk.h>
64 #include "mgc_internal.h"
65
66 static int mgc_name2resid(char *name, int len, struct ldlm_res_id *res_id,
67                           int type)
68 {
69         __u64 resname = 0;
70
71         if (len > 8) {
72                 CERROR("name too long: %s\n", name);
73                 return -EINVAL;
74         }
75         if (len <= 0) {
76                 CERROR("missing name: %s\n", name);
77                 return -EINVAL;
78         }
79         memcpy(&resname, name, len);
80
81         /* Always use the same endianness for the resid */
82         memset(res_id, 0, sizeof(*res_id));
83         res_id->name[0] = cpu_to_le64(resname);
84         /* XXX: unfortunately, sptlprc and config llog share one lock */
85         switch(type) {
86         case CONFIG_T_CONFIG:
87         case CONFIG_T_SPTLRPC:
88                 resname = 0;
89                 break;
90         case CONFIG_T_RECOVER:
91                 resname = type;
92                 break;
93         default:
94                 LBUG();
95         }
96         res_id->name[1] = cpu_to_le64(resname);
97         CDEBUG(D_MGC, "log %s to resid "LPX64"/"LPX64" (%.8s)\n", name,
98                res_id->name[0], res_id->name[1], (char *)&res_id->name[0]);
99         return 0;
100 }
101
102 int mgc_fsname2resid(char *fsname, struct ldlm_res_id *res_id, int type)
103 {
104         /* fsname is at most 8 chars long, maybe contain "-".
105          * e.g. "lustre", "SUN-000" */
106         return mgc_name2resid(fsname, strlen(fsname), res_id, type);
107 }
108 EXPORT_SYMBOL(mgc_fsname2resid);
109
110 int mgc_logname2resid(char *logname, struct ldlm_res_id *res_id, int type)
111 {
112         char *name_end;
113         int len;
114
115         /* logname consists of "fsname-nodetype".
116          * e.g. "lustre-MDT0001", "SUN-000-client" */
117         name_end = strrchr(logname, '-');
118         LASSERT(name_end);
119         len = name_end - logname;
120         return mgc_name2resid(logname, len, res_id, type);
121 }
122
123 /********************** config llog list **********************/
124 static CFS_LIST_HEAD(config_llog_list);
125 static cfs_spinlock_t config_list_lock = CFS_SPIN_LOCK_UNLOCKED;
126
127 /* Take a reference to a config log */
128 static int config_log_get(struct config_llog_data *cld)
129 {
130         ENTRY;
131         cfs_atomic_inc(&cld->cld_refcount);
132         CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
133                cfs_atomic_read(&cld->cld_refcount));
134         RETURN(0);
135 }
136
137 /* Drop a reference to a config log.  When no longer referenced,
138    we can free the config log data */
139 static void config_log_put(struct config_llog_data *cld)
140 {
141         ENTRY;
142
143         CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
144                cfs_atomic_read(&cld->cld_refcount));
145         LASSERT(cfs_atomic_read(&cld->cld_refcount) > 0);
146
147         /* spinlock to make sure no item with 0 refcount in the list */
148         if (cfs_atomic_dec_and_lock(&cld->cld_refcount, &config_list_lock)) {
149                 cfs_list_del(&cld->cld_list_chain);
150                 cfs_spin_unlock(&config_list_lock);
151
152                 CDEBUG(D_MGC, "dropping config log %s\n", cld->cld_logname);
153
154                 if (cld->cld_recover)
155                         config_log_put(cld->cld_recover);
156                 if (cld->cld_sptlrpc)
157                         config_log_put(cld->cld_sptlrpc);
158                 if (cld_is_sptlrpc(cld))
159                         sptlrpc_conf_log_stop(cld->cld_logname);
160
161                 class_export_put(cld->cld_mgcexp);
162                 OBD_FREE(cld, sizeof(*cld) + strlen(cld->cld_logname) + 1);
163         }
164
165         EXIT;
166 }
167
168 /* Find a config log by name */
169 static
170 struct config_llog_data *config_log_find(char *logname,
171                                          struct config_llog_instance *cfg)
172 {
173         struct config_llog_data *cld;
174         struct config_llog_data *found = NULL;
175         void *                   instance;
176         ENTRY;
177
178         LASSERT(logname != NULL);
179
180         instance = cfg ? cfg->cfg_instance : NULL;
181         cfs_spin_lock(&config_list_lock);
182         cfs_list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
183                 /* check if instance equals */
184                 if (instance != cld->cld_cfg.cfg_instance)
185                         continue;
186
187                 /* instance may be NULL, should check name */
188                 if (strcmp(logname, cld->cld_logname) == 0) {
189                         found = cld;
190                         break;
191                 }
192         }
193         if (found) {
194                 cfs_atomic_inc(&found->cld_refcount);
195                 LASSERT(found->cld_stopping == 0 || cld_is_sptlrpc(found) == 0);
196         }
197         cfs_spin_unlock(&config_list_lock);
198         RETURN(found);
199 }
200
201 static
202 struct config_llog_data *do_config_log_add(struct obd_device *obd,
203                                            char *logname,
204                                            int type,
205                                            struct config_llog_instance *cfg,
206                                            struct super_block *sb)
207 {
208         struct config_llog_data *cld;
209         int                      rc;
210         ENTRY;
211
212         CDEBUG(D_MGC, "do adding config log %s:%p\n", logname,
213                cfg ? cfg->cfg_instance : 0);
214
215         OBD_ALLOC(cld, sizeof(*cld) + strlen(logname) + 1);
216         if (!cld)
217                 RETURN(ERR_PTR(-ENOMEM));
218
219         strcpy(cld->cld_logname, logname);
220         if (cfg)
221                 cld->cld_cfg = *cfg;
222         cfs_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         cfs_atomic_set(&cld->cld_refcount, 1);
228
229         /* Keep the mgc around until we are done */
230         cld->cld_mgcexp = class_export_get(obd->obd_self_export);
231
232         if (cld_is_sptlrpc(cld)) {
233                 sptlrpc_conf_log_start(logname);
234                 cld->cld_cfg.cfg_obdname = obd->obd_name;
235         }
236
237         rc = mgc_logname2resid(logname, &cld->cld_resid, type);
238
239         cfs_spin_lock(&config_list_lock);
240         cfs_list_add(&cld->cld_list_chain, &config_llog_list);
241         cfs_spin_unlock(&config_list_lock);
242
243         if (rc) {
244                 config_log_put(cld);
245                 RETURN(ERR_PTR(rc));
246         }
247
248         if (cld_is_sptlrpc(cld)) {
249                 rc = mgc_process_log(obd, cld);
250                 if (rc)
251                         CERROR("failed processing sptlrpc log: %d\n", rc);
252         }
253
254         RETURN(cld);
255 }
256
257 static struct config_llog_data *config_recover_log_add(struct obd_device *obd,
258         char *fsname,
259         struct config_llog_instance *cfg,
260         struct super_block *sb)
261 {
262         struct config_llog_instance lcfg = *cfg;
263         struct lustre_sb_info *lsi = s2lsi(sb);
264         struct config_llog_data *cld;
265         char logname[32];
266
267         if ((lsi->lsi_flags & LSI_SERVER) && !IS_MDT(lsi->lsi_ldd))
268                 return NULL;
269
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 (lsi->lsi_flags & LSI_SERVER) { /* mdt */
275                 LASSERT(lcfg.cfg_instance == NULL);
276                 lcfg.cfg_instance = sb;
277                 strcat(logname, "-mdtir");
278         } else {
279                 LASSERT(lcfg.cfg_instance != NULL);
280                 strcat(logname, "-cliir");
281         }
282
283         cld = do_config_log_add(obd, logname, CONFIG_T_RECOVER, &lcfg, sb);
284         return cld;
285 }
286
287
288 /** Add this log to the list of active logs watched by an MGC.
289  * Active means we're watching for updates.
290  * We have one active log per "mount" - client instance or servername.
291  * Each instance may be at a different point in the log.
292  */
293 static int config_log_add(struct obd_device *obd, char *logname,
294                           struct config_llog_instance *cfg,
295                           struct super_block *sb)
296 {
297         struct lustre_sb_info *lsi = s2lsi(sb);
298         struct config_llog_data *cld;
299         struct config_llog_data *sptlrpc_cld;
300         char                     seclogname[32];
301         char                    *ptr;
302         ENTRY;
303
304         CDEBUG(D_MGC, "adding config log %s:%p\n", logname, cfg->cfg_instance);
305
306         /*
307          * for each regular log, the depended sptlrpc log name is
308          * <fsname>-sptlrpc. multiple regular logs may share one sptlrpc log.
309          */
310         ptr = strrchr(logname, '-');
311         if (ptr == NULL || ptr - logname > 8) {
312                 CERROR("logname %s is too long\n", logname);
313                 RETURN(-EINVAL);
314         }
315
316         memcpy(seclogname, logname, ptr - logname);
317         strcpy(seclogname + (ptr - logname), "-sptlrpc");
318
319         sptlrpc_cld = config_log_find(seclogname, NULL);
320         if (sptlrpc_cld == NULL) {
321                 sptlrpc_cld = do_config_log_add(obd, seclogname,
322                                                 CONFIG_T_SPTLRPC, NULL, NULL);
323                 if (IS_ERR(sptlrpc_cld)) {
324                         CERROR("can't create sptlrpc log: %s\n", seclogname);
325                         RETURN(PTR_ERR(sptlrpc_cld));
326                 }
327         }
328
329         cld = do_config_log_add(obd, logname, CONFIG_T_CONFIG, cfg, sb);
330         if (IS_ERR(cld)) {
331                 CERROR("can't create log: %s\n", logname);
332                 config_log_put(sptlrpc_cld);
333                 RETURN(PTR_ERR(cld));
334         }
335
336         cld->cld_sptlrpc = sptlrpc_cld;
337
338         LASSERT(lsi->lsi_lmd);
339         if (!(lsi->lsi_lmd->lmd_flags & LMD_FLG_NOIR)) {
340                 struct config_llog_data *recover_cld;
341                 *strrchr(seclogname, '-') = 0;
342                 recover_cld = config_recover_log_add(obd, seclogname, cfg, sb);
343                 if (IS_ERR(recover_cld)) {
344                         config_log_put(cld);
345                         RETURN(PTR_ERR(recover_cld));
346                 }
347                 cld->cld_recover = recover_cld;
348         }
349
350         RETURN(0);
351 }
352
353 CFS_DECLARE_MUTEX(llog_process_lock);
354
355 /** Stop watching for updates on this log.
356  */
357 static int config_log_end(char *logname, struct config_llog_instance *cfg)
358 {
359         struct config_llog_data *cld;
360         struct config_llog_data *cld_sptlrpc = NULL;
361         struct config_llog_data *cld_recover = NULL;
362         int rc = 0;
363         ENTRY;
364
365         cld = config_log_find(logname, cfg);
366         if (cld == NULL)
367                 RETURN(-ENOENT);
368
369         cfs_mutex_lock(&cld->cld_lock);
370         /*
371          * if cld_stopping is set, it means we didn't start the log thus
372          * not owning the start ref. this can happen after previous umount:
373          * the cld still hanging there waiting for lock cancel, and we
374          * remount again but failed in the middle and call log_end without
375          * calling start_log.
376          */
377         if (unlikely(cld->cld_stopping)) {
378                 cfs_mutex_unlock(&cld->cld_lock);
379                 /* drop the ref from the find */
380                 config_log_put(cld);
381                 RETURN(rc);
382         }
383
384         cld->cld_stopping = 1;
385
386         cld_recover = cld->cld_recover;
387         cld->cld_recover = NULL;
388         cfs_mutex_unlock(&cld->cld_lock);
389
390         if (cld_recover) {
391                 cfs_mutex_lock(&cld_recover->cld_lock);
392                 cld_recover->cld_stopping = 1;
393                 cfs_mutex_unlock(&cld_recover->cld_lock);
394                 config_log_put(cld_recover);
395         }
396
397         cfs_spin_lock(&config_list_lock);
398         cld_sptlrpc = cld->cld_sptlrpc;
399         cld->cld_sptlrpc = NULL;
400         cfs_spin_unlock(&config_list_lock);
401
402         if (cld_sptlrpc)
403                 config_log_put(cld_sptlrpc);
404
405         /* drop the ref from the find */
406         config_log_put(cld);
407         /* drop the start ref */
408         config_log_put(cld);
409
410         CDEBUG(D_MGC, "end config log %s (%d)\n", logname ? logname : "client",
411                rc);
412         RETURN(rc);
413 }
414
415 int lprocfs_mgc_rd_ir_state(char *page, char **start, off_t off,
416                             int count, int *eof, void *data)
417 {
418         struct obd_device       *obd = data;
419         struct obd_import       *imp = obd->u.cli.cl_import;
420         struct obd_connect_data *ocd = &imp->imp_connect_data;
421         struct config_llog_data *cld;
422         int rc = 0;
423         ENTRY;
424
425         rc = snprintf(page, count, "imperative_recovery: %s\n",
426                       OCD_HAS_FLAG(ocd, IMP_RECOV) ? "ON" : "OFF");
427         rc += snprintf(page + rc, count - rc, "client_state:\n");
428
429         cfs_spin_lock(&config_list_lock);
430         cfs_list_for_each_entry(cld, &config_llog_list, cld_list_chain) {
431                 if (cld->cld_recover == NULL)
432                         continue;
433                 rc += snprintf(page + rc, count - rc,
434                                "    - { client: %s, nidtbl_version: %u }\n",
435                                cld->cld_logname,
436                                cld->cld_recover->cld_cfg.cfg_last_idx);
437         }
438         cfs_spin_unlock(&config_list_lock);
439
440         RETURN(rc);
441 }
442
443 /* reenqueue any lost locks */
444 #define RQ_RUNNING 0x1
445 #define RQ_NOW     0x2
446 #define RQ_LATER   0x4
447 #define RQ_STOP    0x8
448 static int                    rq_state = 0;
449 static cfs_waitq_t            rq_waitq;
450 static CFS_DECLARE_COMPLETION(rq_exit);
451
452 static void do_requeue(struct config_llog_data *cld)
453 {
454         ENTRY;
455         LASSERT(cfs_atomic_read(&cld->cld_refcount) > 0);
456
457         /* Do not run mgc_process_log on a disconnected export or an
458            export which is being disconnected. Take the client
459            semaphore to make the check non-racy. */
460         cfs_down_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
461         if (cld->cld_mgcexp->exp_obd->u.cli.cl_conn_count != 0) {
462                 CDEBUG(D_MGC, "updating log %s\n", cld->cld_logname);
463                 mgc_process_log(cld->cld_mgcexp->exp_obd, cld);
464         } else {
465                 CDEBUG(D_MGC, "disconnecting, won't update log %s\n",
466                        cld->cld_logname);
467         }
468         cfs_up_read(&cld->cld_mgcexp->exp_obd->u.cli.cl_sem);
469
470         EXIT;
471 }
472
473 /* this timeout represents how many seconds MGC should wait before
474  * requeue config and recover lock to the MGS. We need to randomize this
475  * in order to not flood the MGS.
476  */
477 #define MGC_TIMEOUT_MIN_SECONDS   5
478 #define MGC_TIMEOUT_RAND_CENTISEC 0x1ff /* ~500 */
479
480 static int mgc_requeue_thread(void *data)
481 {
482         char name[] = "ll_cfg_requeue";
483         int rc = 0;
484         ENTRY;
485
486         cfs_daemonize(name);
487
488         CDEBUG(D_MGC, "Starting requeue thread\n");
489
490         /* Keep trying failed locks periodically */
491         cfs_spin_lock(&config_list_lock);
492         rq_state |= RQ_RUNNING;
493         while (1) {
494                 struct l_wait_info lwi;
495                 struct config_llog_data *cld, *cld_prev;
496                 int rand = cfs_rand() & MGC_TIMEOUT_RAND_CENTISEC;
497                 int stopped = !!(rq_state & RQ_STOP);
498                 int to;
499
500                 /* Any new or requeued lostlocks will change the state */
501                 rq_state &= ~(RQ_NOW | RQ_LATER);
502                 cfs_spin_unlock(&config_list_lock);
503
504                 /* Always wait a few seconds to allow the server who
505                    caused the lock revocation to finish its setup, plus some
506                    random so everyone doesn't try to reconnect at once. */
507                 to = MGC_TIMEOUT_MIN_SECONDS * CFS_HZ;
508                 to += rand * CFS_HZ / 100; /* rand is centi-seconds */
509                 lwi = LWI_TIMEOUT(to, NULL, NULL);
510                 l_wait_event(rq_waitq, rq_state & RQ_STOP, &lwi);
511
512                 /*
513                  * iterate & processing through the list. for each cld, process
514                  * its depending sptlrpc cld firstly (if any) and then itself.
515                  *
516                  * it's guaranteed any item in the list must have
517                  * reference > 0; and if cld_lostlock is set, at
518                  * least one reference is taken by the previous enqueue.
519                  */
520                 cld_prev = NULL;
521
522                 cfs_spin_lock(&config_list_lock);
523                 cfs_list_for_each_entry(cld, &config_llog_list,
524                                         cld_list_chain) {
525                         if (!cld->cld_lostlock)
526                                 continue;
527
528                         cfs_spin_unlock(&config_list_lock);
529
530                         LASSERT(cfs_atomic_read(&cld->cld_refcount) > 0);
531
532                         /* Whether we enqueued again or not in mgc_process_log,
533                          * we're done with the ref from the old enqueue */
534                         if (cld_prev)
535                                 config_log_put(cld_prev);
536                         cld_prev = cld;
537
538                         cld->cld_lostlock = 0;
539                         if (likely(!stopped))
540                                 do_requeue(cld);
541
542                         cfs_spin_lock(&config_list_lock);
543                 }
544                 cfs_spin_unlock(&config_list_lock);
545                 if (cld_prev)
546                         config_log_put(cld_prev);
547
548                 /* break after scanning the list so that we can drop
549                  * refcount to losing lock clds */
550                 if (unlikely(stopped)) {
551                         cfs_spin_lock(&config_list_lock);
552                         break;
553                 }
554
555                 /* Wait a bit to see if anyone else needs a requeue */
556                 lwi = (struct l_wait_info) { 0 };
557                 l_wait_event(rq_waitq, rq_state & (RQ_NOW | RQ_STOP),
558                              &lwi);
559                 cfs_spin_lock(&config_list_lock);
560         }
561         /* spinlock and while guarantee RQ_NOW and RQ_LATER are not set */
562         rq_state &= ~RQ_RUNNING;
563         cfs_spin_unlock(&config_list_lock);
564
565         cfs_complete(&rq_exit);
566
567         CDEBUG(D_MGC, "Ending requeue thread\n");
568         RETURN(rc);
569 }
570
571 /* Add a cld to the list to requeue.  Start the requeue thread if needed.
572    We are responsible for dropping the config log reference from here on out. */
573 static void mgc_requeue_add(struct config_llog_data *cld)
574 {
575         ENTRY;
576
577         CDEBUG(D_INFO, "log %s: requeue (r=%d sp=%d st=%x)\n",
578                cld->cld_logname, cfs_atomic_read(&cld->cld_refcount),
579                cld->cld_stopping, rq_state);
580         LASSERT(cfs_atomic_read(&cld->cld_refcount) > 0);
581
582         cfs_mutex_lock(&cld->cld_lock);
583         if (cld->cld_stopping || cld->cld_lostlock) {
584                 cfs_mutex_unlock(&cld->cld_lock);
585                 RETURN_EXIT;
586         }
587         /* this refcount will be released in mgc_requeue_thread. */
588         config_log_get(cld);
589         cld->cld_lostlock = 1;
590         cfs_mutex_unlock(&cld->cld_lock);
591
592         /* Hold lock for rq_state */
593         cfs_spin_lock(&config_list_lock);
594         if (rq_state & RQ_STOP) {
595                 cfs_spin_unlock(&config_list_lock);
596                 cld->cld_lostlock = 0;
597                 config_log_put(cld);
598         } else {
599                 rq_state |= RQ_NOW;
600                 cfs_spin_unlock(&config_list_lock);
601                 cfs_waitq_signal(&rq_waitq);
602         }
603         EXIT;
604 }
605
606 /********************** class fns **********************/
607
608 static int mgc_fs_setup(struct obd_device *obd, struct super_block *sb,
609                         struct vfsmount *mnt)
610 {
611         struct lvfs_run_ctxt saved;
612         struct lustre_sb_info *lsi = s2lsi(sb);
613         struct client_obd *cli = &obd->u.cli;
614         struct dentry *dentry;
615         char *label;
616         int err = 0;
617         ENTRY;
618
619         LASSERT(lsi);
620         LASSERT(lsi->lsi_srv_mnt == mnt);
621
622         /* The mgc fs exclusion sem. Only one fs can be setup at a time. */
623         cfs_down(&cli->cl_mgc_sem);
624
625         cfs_cleanup_group_info();
626
627         obd->obd_fsops = fsfilt_get_ops(MT_STR(lsi->lsi_ldd));
628         if (IS_ERR(obd->obd_fsops)) {
629                 cfs_up(&cli->cl_mgc_sem);
630                 CERROR("No fstype %s rc=%ld\n", MT_STR(lsi->lsi_ldd),
631                        PTR_ERR(obd->obd_fsops));
632                 RETURN(PTR_ERR(obd->obd_fsops));
633         }
634
635         cli->cl_mgc_vfsmnt = mnt;
636         fsfilt_setup(obd, mnt->mnt_sb);
637
638         OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
639         obd->obd_lvfs_ctxt.pwdmnt = mnt;
640         obd->obd_lvfs_ctxt.pwd = mnt->mnt_root;
641         obd->obd_lvfs_ctxt.fs = get_ds();
642
643         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
644         dentry = ll_lookup_one_len(MOUNT_CONFIGS_DIR, cfs_fs_pwd(current->fs),
645                                    strlen(MOUNT_CONFIGS_DIR));
646         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
647         if (IS_ERR(dentry)) {
648                 err = PTR_ERR(dentry);
649                 CERROR("cannot lookup %s directory: rc = %d\n",
650                        MOUNT_CONFIGS_DIR, err);
651                 GOTO(err_ops, err);
652         }
653         cli->cl_mgc_configs_dir = dentry;
654
655         /* We take an obd ref to insure that we can't get to mgc_cleanup
656            without calling mgc_fs_cleanup first. */
657         class_incref(obd, "mgc_fs", obd);
658
659         label = fsfilt_get_label(obd, mnt->mnt_sb);
660         if (label)
661                 CDEBUG(D_MGC, "MGC using disk labelled=%s\n", label);
662
663         /* We keep the cl_mgc_sem until mgc_fs_cleanup */
664         RETURN(0);
665
666 err_ops:
667         fsfilt_put_ops(obd->obd_fsops);
668         obd->obd_fsops = NULL;
669         cli->cl_mgc_vfsmnt = NULL;
670         cfs_up(&cli->cl_mgc_sem);
671         RETURN(err);
672 }
673
674 static int mgc_fs_cleanup(struct obd_device *obd)
675 {
676         struct client_obd *cli = &obd->u.cli;
677         int rc = 0;
678         ENTRY;
679
680         LASSERT(cli->cl_mgc_vfsmnt != NULL);
681
682         if (cli->cl_mgc_configs_dir != NULL) {
683                 struct lvfs_run_ctxt saved;
684                 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
685                 l_dput(cli->cl_mgc_configs_dir);
686                 cli->cl_mgc_configs_dir = NULL;
687                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
688                 class_decref(obd, "mgc_fs", obd);
689         }
690
691         cli->cl_mgc_vfsmnt = NULL;
692         if (obd->obd_fsops)
693                 fsfilt_put_ops(obd->obd_fsops);
694
695         cfs_up(&cli->cl_mgc_sem);
696
697         RETURN(rc);
698 }
699
700 static cfs_atomic_t mgc_count = CFS_ATOMIC_INIT(0);
701 static int mgc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
702 {
703         int rc = 0;
704         ENTRY;
705
706         switch (stage) {
707         case OBD_CLEANUP_EARLY:
708                 break;
709         case OBD_CLEANUP_EXPORTS:
710                 if (cfs_atomic_dec_and_test(&mgc_count)) {
711                         int running;
712                         /* stop requeue thread */
713                         cfs_spin_lock(&config_list_lock);
714                         running = rq_state & RQ_RUNNING;
715                         if (running)
716                                 rq_state |= RQ_STOP;
717                         cfs_spin_unlock(&config_list_lock);
718                         if (running) {
719                                 cfs_waitq_signal(&rq_waitq);
720                                 cfs_wait_for_completion(&rq_exit);
721                         }
722                 }
723                 obd_cleanup_client_import(obd);
724                 rc = obd_llog_finish(obd, 0);
725                 if (rc != 0)
726                         CERROR("failed to cleanup llogging subsystems\n");
727                 break;
728         }
729         RETURN(rc);
730 }
731
732 static int mgc_cleanup(struct obd_device *obd)
733 {
734         struct client_obd *cli = &obd->u.cli;
735         int rc;
736         ENTRY;
737
738         LASSERT(cli->cl_mgc_vfsmnt == NULL);
739
740         /* COMPAT_146 - old config logs may have added profiles we don't
741            know about */
742         if (obd->obd_type->typ_refcnt <= 1)
743                 /* Only for the last mgc */
744                 class_del_profiles();
745
746         lprocfs_obd_cleanup(obd);
747         ptlrpcd_decref();
748
749         rc = client_obd_cleanup(obd);
750         RETURN(rc);
751 }
752
753 static int mgc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
754 {
755         struct lprocfs_static_vars lvars;
756         int rc;
757         ENTRY;
758
759         ptlrpcd_addref();
760
761         rc = client_obd_setup(obd, lcfg);
762         if (rc)
763                 GOTO(err_decref, rc);
764
765         rc = obd_llog_init(obd, &obd->obd_olg, obd, NULL);
766         if (rc) {
767                 CERROR("failed to setup llogging subsystems\n");
768                 GOTO(err_cleanup, rc);
769         }
770
771         lprocfs_mgc_init_vars(&lvars);
772         lprocfs_obd_setup(obd, lvars.obd_vars);
773         sptlrpc_lprocfs_cliobd_attach(obd);
774
775         if (cfs_atomic_inc_return(&mgc_count) == 1) {
776                 rq_state = 0;
777                 cfs_waitq_init(&rq_waitq);
778
779                 /* start requeue thread */
780                 rc = cfs_create_thread(mgc_requeue_thread, NULL,
781                                        CFS_DAEMON_FLAGS);
782                 if (rc < 0) {
783                         CERROR("%s: Cannot start requeue thread (%d),"
784                                "no more log updates!\n",
785                                obd->obd_name, rc);
786                         GOTO(err_cleanup, rc);
787                 }
788                 /* rc is the pid of mgc_requeue_thread. */
789                 rc = 0;
790         }
791
792         RETURN(rc);
793
794 err_cleanup:
795         client_obd_cleanup(obd);
796 err_decref:
797         ptlrpcd_decref();
798         RETURN(rc);
799 }
800
801 /* based on ll_mdc_blocking_ast */
802 static int mgc_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
803                             void *data, int flag)
804 {
805         struct lustre_handle lockh;
806         struct config_llog_data *cld = (struct config_llog_data *)data;
807         int rc = 0;
808         ENTRY;
809
810         switch (flag) {
811         case LDLM_CB_BLOCKING:
812                 /* mgs wants the lock, give it up... */
813                 LDLM_DEBUG(lock, "MGC blocking CB");
814                 ldlm_lock2handle(lock, &lockh);
815                 rc = ldlm_cli_cancel(&lockh);
816                 break;
817         case LDLM_CB_CANCELING:
818                 /* We've given up the lock, prepare ourselves to update. */
819                 LDLM_DEBUG(lock, "MGC cancel CB");
820
821                 CDEBUG(D_MGC, "Lock res "LPX64" (%.8s)\n",
822                        lock->l_resource->lr_name.name[0],
823                        (char *)&lock->l_resource->lr_name.name[0]);
824
825                 if (!cld) {
826                         CDEBUG(D_INFO, "missing data, won't requeue\n");
827                         break;
828                 }
829
830                 /* held at mgc_process_log(). */
831                 LASSERT(cfs_atomic_read(&cld->cld_refcount) > 0);
832                 /* Are we done with this log? */
833                 if (cld->cld_stopping) {
834                         CDEBUG(D_MGC, "log %s: stopping, won't requeue\n",
835                                cld->cld_logname);
836                         config_log_put(cld);
837                         break;
838                 }
839                 /* Make sure not to re-enqueue when the mgc is stopping
840                    (we get called from client_disconnect_export) */
841                 if (!lock->l_conn_export ||
842                     !lock->l_conn_export->exp_obd->u.cli.cl_conn_count) {
843                         CDEBUG(D_MGC, "log %.8s: disconnecting, won't requeue\n",
844                                cld->cld_logname);
845                         config_log_put(cld);
846                         break;
847                 }
848
849                 /* Re-enqueue now */
850                 mgc_requeue_add(cld);
851                 config_log_put(cld);
852                 break;
853         default:
854                 LBUG();
855         }
856
857         RETURN(rc);
858 }
859
860 /* Not sure where this should go... */
861 #define  MGC_ENQUEUE_LIMIT 50
862 #define  MGC_TARGET_REG_LIMIT 10
863 #define  MGC_SEND_PARAM_LIMIT 10
864
865 /* Send parameter to MGS*/
866 static int mgc_set_mgs_param(struct obd_export *exp,
867                              struct mgs_send_param *msp)
868 {
869         struct ptlrpc_request *req;
870         struct mgs_send_param *req_msp, *rep_msp;
871         int rc;
872         ENTRY;
873
874         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
875                                         &RQF_MGS_SET_INFO, LUSTRE_MGS_VERSION,
876                                         MGS_SET_INFO);
877         if (!req)
878                 RETURN(-ENOMEM);
879
880         req_msp = req_capsule_client_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
881         if (!req_msp) {
882                 ptlrpc_req_finished(req);
883                 RETURN(-ENOMEM);
884         }
885
886         memcpy(req_msp, msp, sizeof(*req_msp));
887         ptlrpc_request_set_replen(req);
888
889         /* Limit how long we will wait for the enqueue to complete */
890         req->rq_delay_limit = MGC_SEND_PARAM_LIMIT;
891         rc = ptlrpc_queue_wait(req);
892         if (!rc) {
893                 rep_msp = req_capsule_server_get(&req->rq_pill, &RMF_MGS_SEND_PARAM);
894                 memcpy(msp, rep_msp, sizeof(*rep_msp));
895         }
896
897         ptlrpc_req_finished(req);
898
899         RETURN(rc);
900 }
901
902 /* Take a config lock so we can get cancel notifications */
903 static int mgc_enqueue(struct obd_export *exp, struct lov_stripe_md *lsm,
904                        __u32 type, ldlm_policy_data_t *policy, __u32 mode,
905                        int *flags, void *bl_cb, void *cp_cb, void *gl_cb,
906                        void *data, __u32 lvb_len, void *lvb_swabber,
907                        struct lustre_handle *lockh)
908 {
909         struct config_llog_data *cld = (struct config_llog_data *)data;
910         struct ldlm_enqueue_info einfo = { type, mode, mgc_blocking_ast,
911                          ldlm_completion_ast, NULL, NULL, NULL };
912         struct ptlrpc_request *req;
913         int short_limit = cld_is_sptlrpc(cld);
914         int rc;
915         ENTRY;
916
917         CDEBUG(D_MGC, "Enqueue for %s (res "LPX64")\n", cld->cld_logname,
918                cld->cld_resid.name[0]);
919
920         /* We need a callback for every lockholder, so don't try to
921            ldlm_lock_match (see rev 1.1.2.11.2.47) */
922         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
923                                         &RQF_LDLM_ENQUEUE, LUSTRE_DLM_VERSION,
924                                         LDLM_ENQUEUE);
925         if (req == NULL)
926                 RETURN(-ENOMEM);
927         ptlrpc_request_set_replen(req);
928
929         /* check if this is server or client */
930         if (cld->cld_cfg.cfg_sb) {
931                 struct lustre_sb_info *lsi = s2lsi(cld->cld_cfg.cfg_sb);
932                 if (lsi && (lsi->lsi_flags & LSI_SERVER))
933                         short_limit = 1;
934         }
935         /* Limit how long we will wait for the enqueue to complete */
936         req->rq_delay_limit = short_limit ? 5 : MGC_ENQUEUE_LIMIT;
937         rc = ldlm_cli_enqueue(exp, &req, &einfo, &cld->cld_resid, NULL, flags,
938                               NULL, 0, lockh, 0);
939         /* A failed enqueue should still call the mgc_blocking_ast,
940            where it will be requeued if needed ("grant failed"). */
941         ptlrpc_req_finished(req);
942         RETURN(rc);
943 }
944
945 static int mgc_cancel(struct obd_export *exp, struct lov_stripe_md *md,
946                       __u32 mode, struct lustre_handle *lockh)
947 {
948         ENTRY;
949
950         ldlm_lock_decref(lockh, mode);
951
952         RETURN(0);
953 }
954
955 static void mgc_notify_active(struct obd_device *unused)
956 {
957         /* wakeup mgc_requeue_thread to requeue mgc lock */
958         cfs_spin_lock(&config_list_lock);
959         rq_state |= RQ_NOW;
960         cfs_spin_unlock(&config_list_lock);
961         cfs_waitq_signal(&rq_waitq);
962
963         /* TODO: Help the MGS rebuild nidtbl. -jay */
964 }
965
966 /* Send target_reg message to MGS */
967 static int mgc_target_register(struct obd_export *exp,
968                                struct mgs_target_info *mti)
969 {
970         struct ptlrpc_request  *req;
971         struct mgs_target_info *req_mti, *rep_mti;
972         int                     rc;
973         ENTRY;
974
975         req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp),
976                                         &RQF_MGS_TARGET_REG, LUSTRE_MGS_VERSION,
977                                         MGS_TARGET_REG);
978         if (req == NULL)
979                 RETURN(-ENOMEM);
980
981         req_mti = req_capsule_client_get(&req->rq_pill, &RMF_MGS_TARGET_INFO);
982         if (!req_mti) {
983                 ptlrpc_req_finished(req);
984                 RETURN(-ENOMEM);
985         }
986
987         memcpy(req_mti, mti, sizeof(*req_mti));
988         ptlrpc_request_set_replen(req);
989         CDEBUG(D_MGC, "register %s\n", mti->mti_svname);
990         /* Limit how long we will wait for the enqueue to complete */
991         req->rq_delay_limit = MGC_TARGET_REG_LIMIT;
992
993         rc = ptlrpc_queue_wait(req);
994         if (!rc) {
995                 rep_mti = req_capsule_server_get(&req->rq_pill,
996                                                  &RMF_MGS_TARGET_INFO);
997                 memcpy(mti, rep_mti, sizeof(*rep_mti));
998                 CDEBUG(D_MGC, "register %s got index = %d\n",
999                        mti->mti_svname, mti->mti_stripe_index);
1000         }
1001         ptlrpc_req_finished(req);
1002
1003         RETURN(rc);
1004 }
1005
1006 int mgc_set_info_async(struct obd_export *exp, obd_count keylen,
1007                        void *key, obd_count vallen, void *val,
1008                        struct ptlrpc_request_set *set)
1009 {
1010         int rc = -EINVAL;
1011         ENTRY;
1012
1013         /* Turn off initial_recov after we try all backup servers once */
1014         if (KEY_IS(KEY_INIT_RECOV_BACKUP)) {
1015                 struct obd_import *imp = class_exp2cliimp(exp);
1016                 int value;
1017                 if (vallen != sizeof(int))
1018                         RETURN(-EINVAL);
1019                 value = *(int *)val;
1020                 CDEBUG(D_MGC, "InitRecov %s %d/d%d:i%d:r%d:or%d:%s\n",
1021                        imp->imp_obd->obd_name, value,
1022                        imp->imp_deactive, imp->imp_invalid,
1023                        imp->imp_replayable, imp->imp_obd->obd_replayable,
1024                        ptlrpc_import_state_name(imp->imp_state));
1025                 /* Resurrect if we previously died */
1026                 if ((imp->imp_state != LUSTRE_IMP_FULL &&
1027                      imp->imp_state != LUSTRE_IMP_NEW) || value > 1)
1028                         ptlrpc_reconnect_import(imp);
1029                 RETURN(0);
1030         }
1031         /* FIXME move this to mgc_process_config */
1032         if (KEY_IS(KEY_REGISTER_TARGET)) {
1033                 struct mgs_target_info *mti;
1034                 if (vallen != sizeof(struct mgs_target_info))
1035                         RETURN(-EINVAL);
1036                 mti = (struct mgs_target_info *)val;
1037                 CDEBUG(D_MGC, "register_target %s %#x\n",
1038                        mti->mti_svname, mti->mti_flags);
1039                 rc =  mgc_target_register(exp, mti);
1040                 RETURN(rc);
1041         }
1042         if (KEY_IS(KEY_SET_FS)) {
1043                 struct super_block *sb = (struct super_block *)val;
1044                 struct lustre_sb_info *lsi;
1045                 if (vallen != sizeof(struct super_block))
1046                         RETURN(-EINVAL);
1047                 lsi = s2lsi(sb);
1048                 rc = mgc_fs_setup(exp->exp_obd, sb, lsi->lsi_srv_mnt);
1049                 if (rc) {
1050                         CERROR("set_fs got %d\n", rc);
1051                 }
1052                 RETURN(rc);
1053         }
1054         if (KEY_IS(KEY_CLEAR_FS)) {
1055                 if (vallen != 0)
1056                         RETURN(-EINVAL);
1057                 rc = mgc_fs_cleanup(exp->exp_obd);
1058                 if (rc) {
1059                         CERROR("clear_fs got %d\n", rc);
1060                 }
1061                 RETURN(rc);
1062         }
1063         if (KEY_IS(KEY_SET_INFO)) {
1064                 struct mgs_send_param *msp;
1065
1066                 msp = (struct mgs_send_param *)val;
1067                 rc =  mgc_set_mgs_param(exp, msp);
1068                 RETURN(rc);
1069         }
1070         if (KEY_IS(KEY_MGSSEC)) {
1071                 struct client_obd     *cli = &exp->exp_obd->u.cli;
1072                 struct sptlrpc_flavor  flvr;
1073
1074                 /*
1075                  * empty string means using current flavor, if which haven't
1076                  * been set yet, set it as null.
1077                  *
1078                  * if flavor has been set previously, check the asking flavor
1079                  * must match the existing one.
1080                  */
1081                 if (vallen == 0) {
1082                         if (cli->cl_flvr_mgc.sf_rpc != SPTLRPC_FLVR_INVALID)
1083                                 RETURN(0);
1084                         val = "null";
1085                         vallen = 4;
1086                 }
1087
1088                 rc = sptlrpc_parse_flavor(val, &flvr);
1089                 if (rc) {
1090                         CERROR("invalid sptlrpc flavor %s to MGS\n",
1091                                (char *) val);
1092                         RETURN(rc);
1093                 }
1094
1095                 /*
1096                  * caller already hold a mutex
1097                  */
1098                 if (cli->cl_flvr_mgc.sf_rpc == SPTLRPC_FLVR_INVALID) {
1099                         cli->cl_flvr_mgc = flvr;
1100                 } else if (memcmp(&cli->cl_flvr_mgc, &flvr,
1101                                   sizeof(flvr)) != 0) {
1102                         char    str[20];
1103
1104                         sptlrpc_flavor2name(&cli->cl_flvr_mgc,
1105                                             str, sizeof(str));
1106                         LCONSOLE_ERROR("asking sptlrpc flavor %s to MGS but "
1107                                        "currently %s is in use\n",
1108                                        (char *) val, str);
1109                         rc = -EPERM;
1110                 }
1111                 RETURN(rc);
1112         }
1113
1114         RETURN(rc);
1115 }
1116
1117 static int mgc_get_info(struct obd_export *exp, __u32 keylen, void *key,
1118                         __u32 *vallen, void *val, struct lov_stripe_md *unused)
1119 {
1120         int rc = -EINVAL;
1121
1122         if (KEY_IS(KEY_CONN_DATA)) {
1123                 struct obd_import *imp = class_exp2cliimp(exp);
1124                 struct obd_connect_data *data = val;
1125
1126                 if (*vallen == sizeof(*data)) {
1127                         *data = imp->imp_connect_data;
1128                         rc = 0;
1129                 }
1130         }
1131
1132         return rc;
1133 }
1134
1135 static int mgc_import_event(struct obd_device *obd,
1136                             struct obd_import *imp,
1137                             enum obd_import_event event)
1138 {
1139         int rc = 0;
1140
1141         LASSERT(imp->imp_obd == obd);
1142         CDEBUG(D_MGC, "import event %#x\n", event);
1143
1144         switch (event) {
1145         case IMP_EVENT_DISCON:
1146                 /* MGC imports should not wait for recovery */
1147                 break;
1148         case IMP_EVENT_INACTIVE:
1149                 break;
1150         case IMP_EVENT_INVALIDATE: {
1151                 struct ldlm_namespace *ns = obd->obd_namespace;
1152                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
1153                 break;
1154         }
1155         case IMP_EVENT_ACTIVE:
1156                 LCONSOLE_WARN("%s: Reactivating import\n", obd->obd_name);
1157                 /* Clearing obd_no_recov allows us to continue pinging */
1158                 obd->obd_no_recov = 0;
1159                 mgc_notify_active(obd);
1160                 break;
1161         case IMP_EVENT_OCD:
1162                 break;
1163         case IMP_EVENT_DEACTIVATE:
1164         case IMP_EVENT_ACTIVATE:
1165                 break;
1166         default:
1167                 CERROR("Unknown import event %#x\n", event);
1168                 LBUG();
1169         }
1170         RETURN(rc);
1171 }
1172
1173 static int mgc_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
1174                          struct obd_device *tgt, int *index)
1175 {
1176         struct llog_ctxt *ctxt;
1177         int rc;
1178         ENTRY;
1179
1180         LASSERT(olg == &obd->obd_olg);
1181
1182         rc = llog_setup(obd, olg, LLOG_CONFIG_ORIG_CTXT, tgt, 0, NULL,
1183                         &llog_lvfs_ops);
1184         if (rc)
1185                 RETURN(rc);
1186
1187         rc = llog_setup(obd, olg, LLOG_CONFIG_REPL_CTXT, tgt, 0, NULL,
1188                         &llog_client_ops);
1189         if (rc == 0) {
1190                 ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
1191                 if (!ctxt) {
1192                         ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
1193                         if (ctxt)
1194                                 llog_cleanup(ctxt);
1195                         RETURN(-ENODEV);
1196                 }
1197                 llog_initiator_connect(ctxt);
1198                 llog_ctxt_put(ctxt);
1199         } else {
1200                 ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
1201                 if (ctxt)
1202                         llog_cleanup(ctxt);
1203         }
1204
1205         RETURN(rc);
1206 }
1207
1208 static int mgc_llog_finish(struct obd_device *obd, int count)
1209 {
1210         struct llog_ctxt *ctxt;
1211         int rc = 0, rc2 = 0;
1212         ENTRY;
1213
1214         ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
1215         if (ctxt)
1216                 rc = llog_cleanup(ctxt);
1217
1218         ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
1219         if (ctxt)
1220                 rc2 = llog_cleanup(ctxt);
1221
1222         if (!rc)
1223                 rc = rc2;
1224
1225         RETURN(rc);
1226 }
1227
1228 enum {
1229         CONFIG_READ_NRPAGES_INIT = 1 << (20 - CFS_PAGE_SHIFT),
1230         CONFIG_READ_NRPAGES      = 4
1231 };
1232
1233 static int mgc_apply_recover_logs(struct obd_device *mgc,
1234                                   struct config_llog_data *cld,
1235                                   __u64 max_version,
1236                                   void *data, int datalen)
1237 {
1238         struct config_llog_instance *cfg = &cld->cld_cfg;
1239         struct lustre_sb_info       *lsi = s2lsi(cfg->cfg_sb);
1240         struct mgs_nidtbl_entry *entry;
1241         struct lustre_cfg       *lcfg;
1242         struct lustre_cfg_bufs   bufs;
1243         u64   prev_version = 0;
1244         char *inst;
1245         char *buf;
1246         int   bufsz;
1247         int   pos;
1248         int   rc  = 0;
1249         int   off = 0;
1250         ENTRY;
1251
1252         LASSERT(cfg->cfg_instance != NULL);
1253         LASSERT(cfg->cfg_sb == cfg->cfg_instance);
1254
1255         OBD_ALLOC(inst, CFS_PAGE_SIZE);
1256         if (inst == NULL)
1257                 RETURN(-ENOMEM);
1258
1259         if (!(lsi->lsi_flags & LSI_SERVER)) {
1260                 pos = sprintf(inst, "%p", cfg->cfg_instance);
1261         } else {
1262                 LASSERT(IS_MDT(lsi->lsi_ldd));
1263                 pos = sprintf(inst, "MDT%04x", lsi->lsi_ldd->ldd_svindex);
1264         }
1265
1266         ++pos;
1267         buf   = inst + pos;
1268         bufsz = CFS_PAGE_SIZE - pos;
1269
1270         while (datalen > 0) {
1271                 int   entry_len = sizeof(*entry);
1272                 int   is_ost;
1273                 struct obd_device *obd;
1274                 char *obdname;
1275                 char *cname;
1276                 char *params;
1277                 char *uuid;
1278
1279                 rc = -EINVAL;
1280                 if (datalen < sizeof(*entry))
1281                         break;
1282
1283                 entry = (typeof(entry))(data + off);
1284
1285                 /* sanity check */
1286                 if (entry->mne_nid_type != 0) /* only support type 0 for ipv4 */
1287                         break;
1288                 if (entry->mne_nid_count == 0) /* at least one nid entry */
1289                         break;
1290                 if (entry->mne_nid_size != sizeof(lnet_nid_t))
1291                         break;
1292
1293                 entry_len += entry->mne_nid_count * entry->mne_nid_size;
1294                 if (datalen < entry_len) /* must have entry_len at least */
1295                         break;
1296
1297                 lustre_swab_mgs_nidtbl_entry(entry);
1298                 LASSERT(entry->mne_length <= CFS_PAGE_SIZE);
1299                 if (entry->mne_length < entry_len)
1300                         break;
1301
1302                 off     += entry->mne_length;
1303                 datalen -= entry->mne_length;
1304                 if (datalen < 0)
1305                         break;
1306
1307                 if (entry->mne_version > max_version) {
1308                         CERROR("entry index(%lld) is over max_index(%lld)\n",
1309                                entry->mne_version, max_version);
1310                         break;
1311                 }
1312
1313                 if (prev_version >= entry->mne_version) {
1314                         CERROR("index unsorted, prev %lld, now %lld\n",
1315                                prev_version, entry->mne_version);
1316                         break;
1317                 }
1318                 prev_version = entry->mne_version;
1319
1320                 /*
1321                  * Write a string with format "nid::instance" to
1322                  * lustre/<osc|mdc>/<target>-<osc|mdc>-<instance>/import.
1323                  */
1324
1325                 is_ost = entry->mne_type == LDD_F_SV_TYPE_OST;
1326                 memset(buf, 0, bufsz);
1327                 obdname = buf;
1328                 pos = 0;
1329
1330                 /* lustre-OST0001-osc-<instance #> */
1331                 strcpy(obdname, cld->cld_logname);
1332                 cname = strrchr(obdname, '-');
1333                 if (cname == NULL) {
1334                         CERROR("mgc %s: invalid logname %s\n",
1335                                mgc->obd_name, obdname);
1336                         break;
1337                 }
1338
1339                 pos = cname - obdname;
1340                 obdname[pos] = 0;
1341                 pos += sprintf(obdname + pos, "-%s%04x",
1342                                   is_ost ? "OST" : "MDT", entry->mne_index);
1343
1344                 cname = is_ost ? "osc" : "mdc",
1345                 pos += sprintf(obdname + pos, "-%s-%s", cname, inst);
1346                 lustre_cfg_bufs_reset(&bufs, obdname);
1347
1348                 /* find the obd by obdname */
1349                 obd = class_name2obd(obdname);
1350                 if (obd == NULL) {
1351                         CDEBUG(D_INFO, "mgc %s: cannot find obdname %s\n",
1352                                mgc->obd_name, obdname);
1353
1354                         /* this is a safe race, when the ost is starting up...*/
1355                         continue;
1356                 }
1357
1358                 /* osc.import = "connection=<Conn UUID>::<target instance>" */
1359                 ++pos;
1360                 params = buf + pos;
1361                 pos += sprintf(params, "%s.import=%s", cname, "connection=");
1362                 uuid = buf + pos;
1363
1364                 /* TODO: iterate all nids to find one */
1365                 /* find uuid by nid */
1366                 rc = client_import_find_conn(obd->u.cli.cl_import,
1367                                              entry->u.nids[0],
1368                                              (struct obd_uuid *)uuid);
1369                 if (rc < 0) {
1370                         CERROR("mgc: cannot find uuid by nid %s\n",
1371                                libcfs_nid2str(entry->u.nids[0]));
1372                         break;
1373                 }
1374
1375                 CDEBUG(D_INFO, "Find uuid %s by nid %s\n",
1376                        uuid, libcfs_nid2str(entry->u.nids[0]));
1377
1378                 pos += strlen(uuid);
1379                 pos += sprintf(buf + pos, "::%u", entry->mne_instance);
1380                 LASSERT(pos < bufsz);
1381
1382                 lustre_cfg_bufs_set_string(&bufs, 1, params);
1383
1384                 rc = -ENOMEM;
1385                 lcfg = lustre_cfg_new(LCFG_PARAM, &bufs);
1386                 if (lcfg == NULL) {
1387                         CERROR("mgc: cannot allocate memory\n");
1388                         break;
1389                 }
1390
1391                 CDEBUG(D_INFO, "ir apply logs "LPD64"/"LPD64" for %s -> %s\n",
1392                        prev_version, max_version, obdname, params);
1393
1394                 rc = class_process_config(lcfg);
1395                 lustre_cfg_free(lcfg);
1396                 if (rc)
1397                         CDEBUG(D_INFO, "process config for %s error %d\n",
1398                                obdname, rc);
1399
1400                 /* continue, even one with error */
1401         }
1402
1403         OBD_FREE(inst, CFS_PAGE_SIZE);
1404         RETURN(rc);
1405 }
1406
1407 /**
1408  * This function is called if this client was notified for target restarting
1409  * by the MGS. A CONFIG_READ RPC is going to send to fetch recovery logs.
1410  */
1411 static int mgc_process_recover_log(struct obd_device *obd,
1412                                    struct config_llog_data *cld)
1413 {
1414         struct ptlrpc_request *req = NULL;
1415         struct config_llog_instance *cfg = &cld->cld_cfg;
1416         struct mgs_config_body *body;
1417         struct mgs_config_res  *res;
1418         struct ptlrpc_bulk_desc *desc;
1419         cfs_page_t **pages;
1420         int nrpages;
1421         bool eof = true;
1422         int i;
1423         int ealen;
1424         int rc;
1425         ENTRY;
1426
1427         /* allocate buffer for bulk transfer.
1428          * if this is the first time for this mgs to read logs,
1429          * CONFIG_READ_NRPAGES_INIT will be used since it will read all logs
1430          * once; otherwise, it only reads increment of logs, this should be
1431          * small and CONFIG_READ_NRPAGES will be used.
1432          */
1433         nrpages = CONFIG_READ_NRPAGES;
1434         if (cfg->cfg_last_idx == 0) /* the first time */
1435                 nrpages = CONFIG_READ_NRPAGES_INIT;
1436
1437         OBD_ALLOC(pages, sizeof(*pages) * nrpages);
1438         if (pages == NULL)
1439                 GOTO(out, rc = -ENOMEM);
1440
1441         for (i = 0; i < nrpages; i++) {
1442                 pages[i] = cfs_alloc_page(CFS_ALLOC_STD);
1443                 if (pages[i] == NULL)
1444                         GOTO(out, rc = -ENOMEM);
1445         }
1446
1447 again:
1448         LASSERT(cld_is_recover(cld));
1449         LASSERT(cfs_mutex_is_locked(&cld->cld_lock));
1450         req = ptlrpc_request_alloc(class_exp2cliimp(cld->cld_mgcexp),
1451                                    &RQF_MGS_CONFIG_READ);
1452         if (req == NULL)
1453                 GOTO(out, rc = -ENOMEM);
1454
1455         rc = ptlrpc_request_pack(req, LUSTRE_MGS_VERSION, MGS_CONFIG_READ);
1456         if (rc)
1457                 GOTO(out, rc);
1458
1459         /* pack request */
1460         body = req_capsule_client_get(&req->rq_pill, &RMF_MGS_CONFIG_BODY);
1461         LASSERT(body != NULL);
1462         LASSERT(sizeof(body->mcb_name) > strlen(cld->cld_logname));
1463         strncpy(body->mcb_name, cld->cld_logname, sizeof(body->mcb_name));
1464         body->mcb_offset = cfg->cfg_last_idx + 1;
1465         body->mcb_type   = cld->cld_type;
1466         body->mcb_bits   = CFS_PAGE_SHIFT;
1467         body->mcb_units  = nrpages;
1468
1469         /* allocate bulk transfer descriptor */
1470         desc = ptlrpc_prep_bulk_imp(req, nrpages, BULK_PUT_SINK,
1471                                     MGS_BULK_PORTAL);
1472         if (desc == NULL)
1473                 GOTO(out, rc = -ENOMEM);
1474
1475         for (i = 0; i < nrpages; i++)
1476                 ptlrpc_prep_bulk_page(desc, pages[i], 0, CFS_PAGE_SIZE);
1477
1478         ptlrpc_request_set_replen(req);
1479         rc = ptlrpc_queue_wait(req);
1480         if (rc)
1481                 GOTO(out, rc);
1482
1483         res = req_capsule_server_get(&req->rq_pill, &RMF_MGS_CONFIG_RES);
1484         if (res->mcr_size < res->mcr_offset)
1485                 GOTO(out, rc = -EINVAL);
1486
1487         /* always update the index even though it might have errors with
1488          * handling the recover logs */
1489         cfg->cfg_last_idx = res->mcr_offset;
1490         eof = res->mcr_offset == res->mcr_size;
1491
1492         CDEBUG(D_INFO, "Latest version "LPD64", more %d.\n",
1493                res->mcr_offset, eof == false);
1494
1495         ealen = sptlrpc_cli_unwrap_bulk_read(req, req->rq_bulk, 0);
1496         if (ealen < 0)
1497                 GOTO(out, rc = ealen);
1498
1499         if (ealen > nrpages << CFS_PAGE_SHIFT)
1500                 GOTO(out, rc = -EINVAL);
1501
1502         if (ealen == 0) { /* no logs transferred */
1503                 if (!eof)
1504                         rc = -EINVAL;
1505                 GOTO(out, rc);
1506         }
1507
1508         for (i = 0; i < nrpages && ealen > 0; i++) {
1509                 int rc2;
1510                 void *ptr;
1511
1512                 ptr = cfs_kmap(pages[i]);
1513                 rc2 = mgc_apply_recover_logs(obd, cld, res->mcr_offset, ptr,
1514                                              min_t(int, ealen, CFS_PAGE_SIZE));
1515                 cfs_kunmap(pages[i]);
1516                 if (rc2 < 0) {
1517                         CWARN("Process recover log %s error %d\n",
1518                               cld->cld_logname, rc2);
1519                         break;
1520                 }
1521
1522                 ealen -= CFS_PAGE_SIZE;
1523         }
1524
1525 out:
1526         if (req)
1527                 ptlrpc_req_finished(req);
1528
1529         if (rc == 0 && !eof)
1530                 goto again;
1531
1532         if (pages) {
1533                 for (i = 0; i < nrpages; i++) {
1534                         if (pages[i] == NULL)
1535                                 break;
1536                         cfs_free_page(pages[i]);
1537                 }
1538                 OBD_FREE(pages, sizeof(*pages) * nrpages);
1539         }
1540         return rc;
1541 }
1542
1543 /* identical to mgs_log_is_empty */
1544 static int mgc_llog_is_empty(struct obd_device *obd, struct llog_ctxt *ctxt,
1545                             char *name)
1546 {
1547         struct lvfs_run_ctxt saved;
1548         struct llog_handle *llh;
1549         int rc = 0;
1550
1551         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1552         rc = llog_create(ctxt, &llh, NULL, name);
1553         if (rc == 0) {
1554                 llog_init_handle(llh, LLOG_F_IS_PLAIN, NULL);
1555                 rc = llog_get_size(llh);
1556                 llog_close(llh);
1557         }
1558         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
1559         /* header is record 1 */
1560         return(rc <= 1);
1561 }
1562
1563 static int mgc_copy_handler(struct llog_handle *llh, struct llog_rec_hdr *rec,
1564                             void *data)
1565 {
1566         struct llog_rec_hdr local_rec = *rec;
1567         struct llog_handle *local_llh = (struct llog_handle *)data;
1568         char *cfg_buf = (char*) (rec + 1);
1569         struct lustre_cfg *lcfg;
1570         int rc = 0;
1571         ENTRY;
1572
1573         /* Append all records */
1574         local_rec.lrh_len -= sizeof(*rec) + sizeof(struct llog_rec_tail);
1575         rc = llog_write_rec(local_llh, &local_rec, NULL, 0,
1576                             (void *)cfg_buf, -1);
1577
1578         lcfg = (struct lustre_cfg *)cfg_buf;
1579         CDEBUG(D_INFO, "idx=%d, rc=%d, len=%d, cmd %x %s %s\n",
1580                rec->lrh_index, rc, rec->lrh_len, lcfg->lcfg_command,
1581                lustre_cfg_string(lcfg, 0), lustre_cfg_string(lcfg, 1));
1582
1583         RETURN(rc);
1584 }
1585
1586 /* Copy a remote log locally */
1587 static int mgc_copy_llog(struct obd_device *obd, struct llog_ctxt *rctxt,
1588                          struct llog_ctxt *lctxt, char *logname)
1589 {
1590         struct llog_handle *local_llh, *remote_llh;
1591         struct obd_uuid *uuid;
1592         char *temp_log;
1593         int rc, rc2;
1594         ENTRY;
1595
1596         /* Write new log to a temp name, then vfs_rename over logname
1597            upon successful completion. */
1598
1599         OBD_ALLOC(temp_log, strlen(logname) + 1);
1600         if (!temp_log)
1601                 RETURN(-ENOMEM);
1602         sprintf(temp_log, "%sT", logname);
1603
1604         /* Make sure there's no old temp log */
1605         rc = llog_create(lctxt, &local_llh, NULL, temp_log);
1606         if (rc)
1607                 GOTO(out, rc);
1608         rc = llog_init_handle(local_llh, LLOG_F_IS_PLAIN, NULL);
1609         if (rc)
1610                 GOTO(out, rc);
1611         rc = llog_destroy(local_llh);
1612         llog_free_handle(local_llh);
1613         if (rc)
1614                 GOTO(out, rc);
1615
1616         /* open local log */
1617         rc = llog_create(lctxt, &local_llh, NULL, temp_log);
1618         if (rc)
1619                 GOTO(out, rc);
1620
1621         /* set the log header uuid for fun */
1622         OBD_ALLOC_PTR(uuid);
1623         obd_str2uuid(uuid, logname);
1624         rc = llog_init_handle(local_llh, LLOG_F_IS_PLAIN, uuid);
1625         OBD_FREE_PTR(uuid);
1626         if (rc)
1627                 GOTO(out_closel, rc);
1628
1629         /* open remote log */
1630         rc = llog_create(rctxt, &remote_llh, NULL, logname);
1631         if (rc)
1632                 GOTO(out_closel, rc);
1633         rc = llog_init_handle(remote_llh, LLOG_F_IS_PLAIN, NULL);
1634         if (rc)
1635                 GOTO(out_closer, rc);
1636
1637         /* Copy remote log */
1638         rc = llog_process(remote_llh, mgc_copy_handler,(void *)local_llh, NULL);
1639
1640 out_closer:
1641         rc2 = llog_close(remote_llh);
1642         if (!rc)
1643                 rc = rc2;
1644 out_closel:
1645         rc2 = llog_close(local_llh);
1646         if (!rc)
1647                 rc = rc2;
1648
1649         /* We've copied the remote log to the local temp log, now
1650            replace the old local log with the temp log. */
1651         if (!rc) {
1652                 struct client_obd *cli = &obd->u.cli;
1653                 LASSERT(cli);
1654                 LASSERT(cli->cl_mgc_configs_dir);
1655                 rc = lustre_rename(cli->cl_mgc_configs_dir, cli->cl_mgc_vfsmnt,
1656                                    temp_log, logname);
1657         }
1658         CDEBUG(D_MGC, "Copied remote log %s (%d)\n", logname, rc);
1659 out:
1660         if (rc)
1661                 CERROR("Failed to copy remote log %s (%d)\n", logname, rc);
1662         OBD_FREE(temp_log, strlen(logname) + 1);
1663         RETURN(rc);
1664 }
1665
1666 /* local_only means it cannot get remote llogs */
1667 static int mgc_process_cfg_log(struct obd_device *mgc,
1668                                struct config_llog_data *cld,
1669                                int local_only)
1670 {
1671         struct llog_ctxt *ctxt, *lctxt = NULL;
1672         struct client_obd *cli = &mgc->u.cli;
1673         struct lvfs_run_ctxt *saved_ctxt;
1674         struct lustre_sb_info *lsi = NULL;
1675         int rc = 0, must_pop = 0;
1676         bool sptlrpc_started = false;
1677
1678         ENTRY;
1679
1680         LASSERT(cld);
1681         LASSERT(cfs_mutex_is_locked(&cld->cld_lock));
1682
1683         /*
1684          * local copy of sptlrpc log is controlled elsewhere, don't try to
1685          * read it up here.
1686          */
1687         if (cld_is_sptlrpc(cld) && local_only)
1688                 RETURN(0);
1689
1690         if (cld->cld_cfg.cfg_sb)
1691                 lsi = s2lsi(cld->cld_cfg.cfg_sb);
1692
1693         ctxt = llog_get_context(mgc, LLOG_CONFIG_REPL_CTXT);
1694         if (!ctxt) {
1695                 CERROR("missing llog context\n");
1696                 RETURN(-EINVAL);
1697         }
1698
1699         OBD_ALLOC_PTR(saved_ctxt);
1700         if (saved_ctxt == NULL)
1701                 RETURN(-ENOMEM);
1702
1703         lctxt = llog_get_context(mgc, LLOG_CONFIG_ORIG_CTXT);
1704
1705         /* Copy the setup log locally if we can. Don't mess around if we're
1706            running an MGS though (logs are already local). */
1707         if (lctxt && lsi && (lsi->lsi_flags & LSI_SERVER) &&
1708             (lsi->lsi_srv_mnt == cli->cl_mgc_vfsmnt) &&
1709             !IS_MGS(lsi->lsi_ldd)) {
1710                 push_ctxt(saved_ctxt, &mgc->obd_lvfs_ctxt, NULL);
1711                 must_pop++;
1712                 if (!local_only)
1713                         /* Only try to copy log if we have the lock. */
1714                         rc = mgc_copy_llog(mgc, ctxt, lctxt, cld->cld_logname);
1715                 if (local_only || rc) {
1716                         if (mgc_llog_is_empty(mgc, lctxt, cld->cld_logname)) {
1717                                 LCONSOLE_ERROR_MSG(0x13a, "Failed to get MGS "
1718                                                    "log %s and no local copy."
1719                                                    "\n", cld->cld_logname);
1720                                 GOTO(out_pop, rc = -ENOTCONN);
1721                         }
1722                         CDEBUG(D_MGC, "Failed to get MGS log %s, using local "
1723                                "copy for now, will try to update later.\n",
1724                                cld->cld_logname);
1725                 }
1726                 /* Now, whether we copied or not, start using the local llog.
1727                    If we failed to copy, we'll start using whatever the old
1728                    log has. */
1729                 llog_ctxt_put(ctxt);
1730                 ctxt = lctxt;
1731                 lctxt = NULL;
1732         } else if (local_only) { /* no local log at client side */
1733                 GOTO(out_pop, rc = -EIO);
1734         }
1735
1736         if (cld_is_sptlrpc(cld)) {
1737                 sptlrpc_conf_log_update_begin(cld->cld_logname);
1738                 sptlrpc_started = true;
1739         }
1740
1741         /* logname and instance info should be the same, so use our
1742            copy of the instance for the update.  The cfg_last_idx will
1743            be updated here. */
1744         rc = class_config_parse_llog(ctxt, cld->cld_logname, &cld->cld_cfg);
1745         EXIT;
1746
1747 out_pop:
1748         llog_ctxt_put(ctxt);
1749         if (lctxt)
1750                 llog_ctxt_put(lctxt);
1751         if (must_pop)
1752                 pop_ctxt(saved_ctxt, &mgc->obd_lvfs_ctxt, NULL);
1753
1754         OBD_FREE_PTR(saved_ctxt);
1755         /*
1756          * update settings on existing OBDs. doing it inside
1757          * of llog_process_lock so no device is attaching/detaching
1758          * in parallel.
1759          * the logname must be <fsname>-sptlrpc
1760          */
1761         if (sptlrpc_started) {
1762                 LASSERT(cld_is_sptlrpc(cld));
1763                 sptlrpc_conf_log_update_end(cld->cld_logname);
1764                 class_notify_sptlrpc_conf(cld->cld_logname,
1765                                           strlen(cld->cld_logname) -
1766                                           strlen("-sptlrpc"));
1767         }
1768
1769         RETURN(rc);
1770 }
1771
1772 /** Get a config log from the MGS and process it.
1773  * This func is called for both clients and servers.
1774  * Copy the log locally before parsing it if appropriate (non-MGS server)
1775  */
1776 int mgc_process_log(struct obd_device *mgc, struct config_llog_data *cld)
1777 {
1778         struct lustre_handle lockh = { 0 };
1779         int rc = 0, rcl, flags = LDLM_FL_NO_LRU;
1780         ENTRY;
1781
1782         LASSERT(cld);
1783
1784         /* I don't want multiple processes running process_log at once --
1785            sounds like badness.  It actually might be fine, as long as
1786            we're not trying to update from the same log
1787            simultaneously (in which case we should use a per-log sem.) */
1788         cfs_mutex_lock(&cld->cld_lock);
1789         if (cld->cld_stopping) {
1790                 cfs_mutex_unlock(&cld->cld_lock);
1791                 RETURN(0);
1792         }
1793
1794         OBD_FAIL_TIMEOUT(OBD_FAIL_MGC_PAUSE_PROCESS_LOG, 20);
1795
1796         CDEBUG(D_MGC, "Process log %s:%p from %d\n", cld->cld_logname,
1797                cld->cld_cfg.cfg_instance, cld->cld_cfg.cfg_last_idx + 1);
1798
1799         /* Get the cfg lock on the llog */
1800         rcl = mgc_enqueue(mgc->u.cli.cl_mgc_mgsexp, NULL, LDLM_PLAIN, NULL,
1801                           LCK_CR, &flags, NULL, NULL, NULL,
1802                           cld, 0, NULL, &lockh);
1803         if (rcl == 0) {
1804                 /* Get the cld, it will be released in mgc_blocking_ast. */
1805                 config_log_get(cld);
1806                 rc = ldlm_lock_set_data(&lockh, (void *)cld);
1807                 LASSERT(rc == 0);
1808         } else {
1809                 CDEBUG(D_MGC, "Can't get cfg lock: %d\n", rcl);
1810
1811                 /* mark cld_lostlock so that it will requeue
1812                  * after MGC becomes available. */
1813                 cld->cld_lostlock = 1;
1814                 /* Get extra reference, it will be put in requeue thread */
1815                 config_log_get(cld);
1816         }
1817
1818
1819         if (cld_is_recover(cld)) {
1820                 rc = 0; /* this is not a fatal error for recover log */
1821                 if (rcl == 0)
1822                         rc = mgc_process_recover_log(mgc, cld);
1823         } else {
1824                 rc = mgc_process_cfg_log(mgc, cld, rcl != 0);
1825         }
1826
1827         CDEBUG(D_MGC, "%s: configuration from log '%s' %sed (%d).\n",
1828                mgc->obd_name, cld->cld_logname, rc ? "fail" : "succeed", rc);
1829
1830         cfs_mutex_unlock(&cld->cld_lock);
1831
1832         /* Now drop the lock so MGS can revoke it */
1833         if (!rcl) {
1834                 rcl = mgc_cancel(mgc->u.cli.cl_mgc_mgsexp, NULL,
1835                                  LCK_CR, &lockh);
1836                 if (rcl)
1837                         CERROR("Can't drop cfg lock: %d\n", rcl);
1838         }
1839
1840         RETURN(rc);
1841 }
1842
1843
1844 /** Called from lustre_process_log.
1845  * LCFG_LOG_START gets the config log from the MGS, processes it to start
1846  * any services, and adds it to the list logs to watch (follow).
1847  */
1848 static int mgc_process_config(struct obd_device *obd, obd_count len, void *buf)
1849 {
1850         struct lustre_cfg *lcfg = buf;
1851         struct config_llog_instance *cfg = NULL;
1852         char *logname;
1853         int rc = 0;
1854         ENTRY;
1855
1856         switch(lcfg->lcfg_command) {
1857         case LCFG_LOV_ADD_OBD: {
1858                 /* Overloading this cfg command: register a new target */
1859                 struct mgs_target_info *mti;
1860
1861                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) !=
1862                     sizeof(struct mgs_target_info))
1863                         GOTO(out, rc = -EINVAL);
1864
1865                 mti = (struct mgs_target_info *)lustre_cfg_buf(lcfg, 1);
1866                 CDEBUG(D_MGC, "add_target %s %#x\n",
1867                        mti->mti_svname, mti->mti_flags);
1868                 rc = mgc_target_register(obd->u.cli.cl_mgc_mgsexp, mti);
1869                 break;
1870         }
1871         case LCFG_LOV_DEL_OBD:
1872                 /* Unregister has no meaning at the moment. */
1873                 CERROR("lov_del_obd unimplemented\n");
1874                 rc = -ENOSYS;
1875                 break;
1876         case LCFG_SPTLRPC_CONF: {
1877                 rc = sptlrpc_process_config(lcfg);
1878                 break;
1879         }
1880         case LCFG_LOG_START: {
1881                 struct config_llog_data *cld;
1882                 struct super_block *sb;
1883
1884                 logname = lustre_cfg_string(lcfg, 1);
1885                 cfg = (struct config_llog_instance *)lustre_cfg_buf(lcfg, 2);
1886                 sb = *(struct super_block **)lustre_cfg_buf(lcfg, 3);
1887
1888                 CDEBUG(D_MGC, "parse_log %s from %d\n", logname,
1889                        cfg->cfg_last_idx);
1890
1891                 /* We're only called through here on the initial mount */
1892                 rc = config_log_add(obd, logname, cfg, sb);
1893                 if (rc)
1894                         break;
1895                 cld = config_log_find(logname, cfg);
1896                 if (cld == NULL) {
1897                         rc = -ENOENT;
1898                         break;
1899                 }
1900
1901                 /* COMPAT_146 */
1902                 /* FIXME only set this for old logs!  Right now this forces
1903                    us to always skip the "inside markers" check */
1904                 cld->cld_cfg.cfg_flags |= CFG_F_COMPAT146;
1905
1906                 rc = mgc_process_log(obd, cld);
1907                 if (rc == 0 && cld->cld_recover != NULL) {
1908                         if (OCD_HAS_FLAG(&obd->u.cli.cl_import->
1909                                          imp_connect_data, IMP_RECOV)) {
1910                                 rc = mgc_process_log(obd, cld->cld_recover);
1911                         } else {
1912                                 struct config_llog_data *cir = cld->cld_recover;
1913                                 cld->cld_recover = NULL;
1914                                 config_log_put(cir);
1915                         }
1916                         if (rc)
1917                                 CERROR("Cannot process recover llog %d\n", rc);
1918                 }
1919                 config_log_put(cld);
1920
1921                 break;
1922         }
1923         case LCFG_LOG_END: {
1924                 logname = lustre_cfg_string(lcfg, 1);
1925
1926                 if (lcfg->lcfg_bufcount >= 2)
1927                         cfg = (struct config_llog_instance *)lustre_cfg_buf(
1928                                 lcfg, 2);
1929                 rc = config_log_end(logname, cfg);
1930                 break;
1931         }
1932         default: {
1933                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1934                 GOTO(out, rc = -EINVAL);
1935
1936         }
1937         }
1938 out:
1939         RETURN(rc);
1940 }
1941
1942 struct obd_ops mgc_obd_ops = {
1943         .o_owner        = THIS_MODULE,
1944         .o_setup        = mgc_setup,
1945         .o_precleanup   = mgc_precleanup,
1946         .o_cleanup      = mgc_cleanup,
1947         .o_add_conn     = client_import_add_conn,
1948         .o_del_conn     = client_import_del_conn,
1949         .o_connect      = client_connect_import,
1950         .o_disconnect   = client_disconnect_export,
1951         //.o_enqueue      = mgc_enqueue,
1952         .o_cancel       = mgc_cancel,
1953         //.o_iocontrol    = mgc_iocontrol,
1954         .o_set_info_async = mgc_set_info_async,
1955         .o_get_info       = mgc_get_info,
1956         .o_import_event = mgc_import_event,
1957         .o_llog_init    = mgc_llog_init,
1958         .o_llog_finish  = mgc_llog_finish,
1959         .o_process_config = mgc_process_config,
1960 };
1961
1962 int __init mgc_init(void)
1963 {
1964         return class_register_type(&mgc_obd_ops, NULL, NULL,
1965                                    LUSTRE_MGC_NAME, NULL);
1966 }
1967
1968 #ifdef __KERNEL__
1969 static void /*__exit*/ mgc_exit(void)
1970 {
1971         class_unregister_type(LUSTRE_MGC_NAME);
1972 }
1973
1974 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
1975 MODULE_DESCRIPTION("Lustre Management Client");
1976 MODULE_LICENSE("GPL");
1977
1978 module_init(mgc_init);
1979 module_exit(mgc_exit);
1980 #endif