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  *  lustre/mgc/mgc_request.c
   5  *  Lustre Management Client
   6  *
   7  *  Copyright (C) 2006 Cluster File Systems, Inc.
   8  *   Author: Nathan Rutman <nathan@clusterfs.com>
   9  *
  10  *   This file is part of Lustre, http://www.lustre.org
  11  *
  12  *   Lustre is free software; you can redistribute it and/or
  13  *   modify it under the terms of version 2 of the GNU General Public
  14  *   License as published by the Free Software Foundation.
  15  *
  16  *   Lustre is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *   GNU General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU General Public License
  22  *   along with Lustre; if not, write to the Free Software
  23  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  */
  26
  27 #ifndef EXPORT_SYMTAB
  28 # define EXPORT_SYMTAB
  29 #endif
  30 #define DEBUG_SUBSYSTEM S_MGC
  31 #define D_MGC D_CONFIG /*|D_WARNING*/
  32
  33 #ifdef __KERNEL__
  34 # include <linux/module.h>
  35 # include <linux/pagemap.h>
  36 # include <linux/miscdevice.h>
  37 # include <linux/init.h>
  38 #else
  39 # include <liblustre.h>
  40 #endif
  41
  42 #include <obd_class.h>
  43 #include <lustre_dlm.h>
  44 #include <lustre_log.h>
  45 #include <lustre_fsfilt.h>
  46 #include <lustre_disk.h>
  47
  48 int mgc_logname2resid(char *logname, struct ldlm_res_id *res_id)
  49 {
  50         char *name_end;
  51         int len;
  52         __u64 resname = 0;
  53
  54         /* fsname is at most 8 chars long at the beginning of the logname
  55            e.g. "lustre-MDT0001" or "lustre" */
  56         name_end = strrchr(logname, '-');
  57         if (name_end)
  58                 len = name_end - logname;
  59         else
  60                 len = strlen(logname);
  61         if (len > 8) {
  62                 CERROR("fsname too long: %s\n", logname);
  63                 return -EINVAL;
  64         }
  65         if (len <= 0) {
  66                 CERROR("missing fsname: %s\n", logname);
  67                 return -EINVAL;
  68         }
  69         memcpy(&resname, logname, len);
  70
  71         memset(res_id, 0, sizeof(*res_id));
  72
  73         /* Always use the same endianness for the resid */
  74         res_id->name[0] = cpu_to_le64(resname);
  75         CDEBUG(D_MGC, "log %s to resid "LPX64"/"LPX64" (%.8s)\n", logname,
  76                res_id->name[0], res_id->name[1], (char *)&res_id->name[0]);
  77         return 0;
  78 }
  79 EXPORT_SYMBOL(mgc_logname2resid);
  80
  81 /********************** config llog list **********************/
  82 static struct list_head config_llog_list = LIST_HEAD_INIT(config_llog_list);
  83 static spinlock_t       config_list_lock = SPIN_LOCK_UNLOCKED;
  84
  85 /* Take a reference to a config log */
  86 static int config_log_get(struct config_llog_data *cld)
  87 {
  88         ENTRY;
  89         if (cld->cld_stopping)
  90                 RETURN(1);
  91         atomic_inc(&cld->cld_refcount);
  92         CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
  93                atomic_read(&cld->cld_refcount));
  94         RETURN(0);
  95 }
  96
  97 /* Drop a reference to a config log.  When no longer referenced,
  98    we can free the config log data */
  99 static void config_log_put(struct config_llog_data *cld)
 100 {
 101         ENTRY;
 102         CDEBUG(D_INFO, "log %s refs %d\n", cld->cld_logname,
 103                atomic_read(&cld->cld_refcount));
 104         if (atomic_dec_and_test(&cld->cld_refcount)) {
 105                 CDEBUG(D_MGC, "dropping config log %s\n", cld->cld_logname);
 106                 class_export_put(cld->cld_mgcexp);
 107                 spin_lock(&config_list_lock);
 108                 list_del(&cld->cld_list_chain);
 109                 spin_unlock(&config_list_lock);
 110                 OBD_FREE(cld->cld_logname, strlen(cld->cld_logname) + 1);
 111                 if (cld->cld_cfg.cfg_instance != NULL)
 112                         OBD_FREE(cld->cld_cfg.cfg_instance,
 113                                  strlen(cld->cld_cfg.cfg_instance) + 1);
 114                 OBD_FREE(cld, sizeof(*cld));
 115         }
 116         EXIT;
 117 }
 118
 119 /* Find a config log by name */
 120 static struct config_llog_data *config_log_find(char *logname,
 121                                                 struct config_llog_instance *cfg)
 122 {
 123         struct list_head *tmp;
 124         struct config_llog_data *cld;
 125         char *logid = logname;
 126         int match_instance = 0;
 127         ENTRY;
 128
 129         if (cfg && cfg->cfg_instance) {
 130                 match_instance++;
 131                 logid = cfg->cfg_instance;
 132         }
 133         if (!logid) {
 134                 CERROR("No log specified\n");
 135                 RETURN(ERR_PTR(-EINVAL));
 136         }
 137
 138         spin_lock(&config_list_lock);
 139         list_for_each(tmp, &config_llog_list) {
 140                 cld = list_entry(tmp, struct config_llog_data, cld_list_chain);
 141                 if (match_instance && cld->cld_cfg.cfg_instance &&
 142                     strcmp(logid, cld->cld_cfg.cfg_instance) == 0)
 143                         goto out_found;
 144                 if (!match_instance &&
 145                     strcmp(logid, cld->cld_logname) == 0)
 146                         goto out_found;
 147         }
 148         spin_unlock(&config_list_lock);
 149
 150         CDEBUG(D_CONFIG, "can't get log %s\n", logid);
 151         RETURN(ERR_PTR(-ENOENT));
 152 out_found:
 153         atomic_inc(&cld->cld_refcount);
 154         spin_unlock(&config_list_lock);
 155         RETURN(cld);
 156 }
 157
 158 /* Add this log to our list of active logs.
 159    We have one active log per "mount" - client instance or servername.
 160    Each instance may be at a different point in the log. */
 161 static int config_log_add(char *logname, struct config_llog_instance *cfg,
 162                           struct super_block *sb)
 163 {
 164         struct config_llog_data *cld;
 165         struct lustre_sb_info *lsi = s2lsi(sb);
 166         int rc;
 167         ENTRY;
 168
 169         CDEBUG(D_MGC, "adding config log %s:%s\n", logname, cfg->cfg_instance);
 170
 171         OBD_ALLOC(cld, sizeof(*cld));
 172         if (!cld)
 173                 RETURN(-ENOMEM);
 174         OBD_ALLOC(cld->cld_logname, strlen(logname) + 1);
 175         if (!cld->cld_logname) {
 176                 OBD_FREE(cld, sizeof(*cld));
 177                 RETURN(-ENOMEM);
 178         }
 179         strcpy(cld->cld_logname, logname);
 180         cld->cld_cfg = *cfg;
 181         cld->cld_cfg.cfg_last_idx = 0;
 182         cld->cld_cfg.cfg_flags = 0;
 183         cld->cld_cfg.cfg_sb = sb;
 184         atomic_set(&cld->cld_refcount, 1);
 185
 186         /* Keep the mgc around until we are done */
 187         cld->cld_mgcexp = class_export_get(lsi->lsi_mgc->obd_self_export);
 188
 189         if (cfg->cfg_instance != NULL) {
 190                 OBD_ALLOC(cld->cld_cfg.cfg_instance,
 191                           strlen(cfg->cfg_instance) + 1);
 192                 strcpy(cld->cld_cfg.cfg_instance, cfg->cfg_instance);
 193         }
 194         rc = mgc_logname2resid(logname, &cld->cld_resid);
 195         spin_lock(&config_list_lock);
 196         list_add(&cld->cld_list_chain, &config_llog_list);
 197         spin_unlock(&config_list_lock);
 198
 199         if (rc) {
 200                 config_log_put(cld);
 201                 RETURN(rc);
 202         }
 203
 204         RETURN(rc);
 205 }
 206
 207 /* Stop watching for updates on this log. */
 208 static int config_log_end(char *logname, struct config_llog_instance *cfg)
 209 {
 210         struct config_llog_data *cld;
 211         int rc = 0;
 212         ENTRY;
 213
 214         cld = config_log_find(logname, cfg);
 215         if (IS_ERR(cld))
 216                 RETURN(PTR_ERR(cld));
 217         /* drop the ref from the find */
 218         config_log_put(cld);
 219
 220         cld->cld_stopping = 1;
 221         /* drop the start ref */
 222         config_log_put(cld);
 223         CDEBUG(D_MGC, "end config log %s (%d)\n", logname ? logname : "client",
 224                rc);
 225         RETURN(rc);
 226 }
 227
 228 /* reenqueue any lost locks */
 229 #define RQ_RUNNING 0x1
 230 #define RQ_NOW     0x2
 231 #define RQ_LATER   0x4
 232 #define RQ_STOP    0x8
 233 static int rq_state = 0;
 234 static cfs_waitq_t rq_waitq;
 235
 236 static int mgc_process_log(struct obd_device *mgc,
 237                            struct config_llog_data *cld);
 238
 239 static int mgc_requeue_thread(void *data)
 240 {
 241         struct l_wait_info lwi_now, lwi_later;
 242         struct config_llog_data *cld, *n;
 243         char name[] = "ll_cfg_requeue";
 244         int rc = 0;
 245         ENTRY;
 246
 247         ptlrpc_daemonize(name);
 248
 249         CDEBUG(D_MGC, "Starting requeue thread\n");
 250
 251         lwi_later = LWI_TIMEOUT(60 * HZ, NULL, NULL);
 252         l_wait_event(rq_waitq, rq_state & (RQ_NOW | RQ_STOP), &lwi_later);
 253
 254         /* Keep trying failed locks periodically */
 255         spin_lock(&config_list_lock);
 256         while (rq_state & (RQ_NOW | RQ_LATER)) {
 257                 /* Any new or requeued lostlocks will change the state */
 258                 rq_state &= ~(RQ_NOW | RQ_LATER);
 259                 spin_unlock(&config_list_lock);
 260
 261                 /* Always wait a few seconds to allow the server who
 262                    caused the lock revocation to finish its setup, plus some
 263                    random so everyone doesn't try to reconnect at once. */
 264                 lwi_now = LWI_TIMEOUT(3 * HZ + (ll_rand() & 0xff) * (HZ / 100),
 265                                       NULL, NULL);
 266                 l_wait_event(rq_waitq, rq_state & RQ_STOP, &lwi_now);
 267
 268                 spin_lock(&config_list_lock);
 269                 list_for_each_entry_safe(cld, n, &config_llog_list,
 270                                          cld_list_chain) {
 271                         spin_unlock(&config_list_lock);
 272                         if (cld->cld_lostlock) {
 273                                 CDEBUG(D_MGC, "updating log %s\n",
 274                                        cld->cld_logname);
 275                                 cld->cld_lostlock = 0;
 276                                 rc = mgc_process_log(cld->cld_mgcexp->exp_obd,
 277                                                      cld);
 278                                 /* Whether we enqueued again or not in
 279                                    mgc_process_log, we're done with the ref
 280                                    from the old enqueue */
 281                                 config_log_put(cld);
 282                         }
 283                         spin_lock(&config_list_lock);
 284                 }
 285                 spin_unlock(&config_list_lock);
 286
 287                 /* Wait a bit to see if anyone else needs a requeue */
 288                 l_wait_event(rq_waitq, rq_state & (RQ_NOW | RQ_STOP),
 289                              &lwi_later);
 290                 spin_lock(&config_list_lock);
 291         }
 292         /* spinlock and while guarantee RQ_NOW and RQ_LATER are not set */
 293         rq_state &= ~RQ_RUNNING;
 294         spin_unlock(&config_list_lock);
 295
 296         CDEBUG(D_MGC, "Ending requeue thread\n");
 297         RETURN(rc);
 298 }
 299
 300 /* Add a cld to the list to requeue.  Start the requeue thread if needed.
 301    We are responsible for dropping the config log reference from here on out. */
 302 static int mgc_requeue_add(struct config_llog_data *cld, int later)
 303 {
 304         int rc = 0;
 305
 306         CDEBUG(D_INFO, "log %s: requeue (l=%d r=%d sp=%d st=%x)\n",
 307                cld->cld_logname, later, atomic_read(&cld->cld_refcount),
 308                cld->cld_stopping, rq_state);
 309
 310         /* Hold lock for rq_state */
 311         spin_lock(&config_list_lock);
 312         cld->cld_lostlock = 1;
 313
 314         if (cld->cld_stopping || (rq_state & RQ_STOP)) {
 315                 spin_unlock(&config_list_lock);
 316                 config_log_put(cld);
 317                 RETURN(0);
 318         }
 319
 320         if (!(rq_state & RQ_RUNNING)) {
 321                 LASSERT(rq_state == 0);
 322                 rq_state = RQ_RUNNING | (later ? RQ_LATER : RQ_NOW);
 323                 spin_unlock(&config_list_lock);
 324                 rc = cfs_kernel_thread(mgc_requeue_thread, 0,
 325                                        CLONE_VM | CLONE_FILES);
 326                 if (rc < 0) {
 327                         CERROR("log %s: cannot start requeue thread (%d),"
 328                                "no more log updates!\n", cld->cld_logname, rc);
 329                         /* Drop the ref, since the rq thread won't */
 330                         cld->cld_lostlock = 0;
 331                         config_log_put(cld);
 332                         rq_state = 0;
 333                         RETURN(rc);
 334                 }
 335         } else {
 336                 rq_state |= later ? RQ_LATER : RQ_NOW;
 337                 spin_unlock(&config_list_lock);
 338                 cfs_waitq_signal(&rq_waitq);
 339         }
 340
 341         RETURN(0);
 342 }
 343
 344 /********************** class fns **********************/
 345
 346 static int mgc_fs_setup(struct obd_device *obd, struct super_block *sb,
 347                         struct vfsmount *mnt)
 348 {
 349         struct lvfs_run_ctxt saved;
 350         struct lustre_sb_info *lsi = s2lsi(sb);
 351         struct client_obd *cli = &obd->u.cli;
 352         struct dentry *dentry;
 353         char *label;
 354         int err = 0;
 355         ENTRY;
 356
 357         LASSERT(lsi);
 358         LASSERT(lsi->lsi_srv_mnt == mnt);
 359
 360         /* The mgc fs exclusion sem. Only one fs can be setup at a time. */
 361         down(&cli->cl_mgc_sem);
 362
 363         cleanup_group_info();
 364
 365         obd->obd_fsops = fsfilt_get_ops(MT_STR(lsi->lsi_ldd));
 366         if (IS_ERR(obd->obd_fsops)) {
 367                 up(&cli->cl_mgc_sem);
 368                 CERROR("No fstype %s rc=%ld\n", MT_STR(lsi->lsi_ldd),
 369                        PTR_ERR(obd->obd_fsops));
 370                 RETURN(PTR_ERR(obd->obd_fsops));
 371         }
 372
 373         cli->cl_mgc_vfsmnt = mnt;
 374         fsfilt_setup(obd, mnt->mnt_sb);
 375
 376         OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
 377         obd->obd_lvfs_ctxt.pwdmnt = mnt;
 378         obd->obd_lvfs_ctxt.pwd = mnt->mnt_root;
 379         obd->obd_lvfs_ctxt.fs = get_ds();
 380
 381         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 382         dentry = lookup_one_len(MOUNT_CONFIGS_DIR, current->fs->pwd,
 383                                 strlen(MOUNT_CONFIGS_DIR));
 384         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 385         if (IS_ERR(dentry)) {
 386                 err = PTR_ERR(dentry);
 387                 CERROR("cannot lookup %s directory: rc = %d\n",
 388                        MOUNT_CONFIGS_DIR, err);
 389                 GOTO(err_ops, err);
 390         }
 391         cli->cl_mgc_configs_dir = dentry;
 392
 393         /* We take an obd ref to insure that we can't get to mgc_cleanup
 394            without calling mgc_fs_cleanup first. */
 395         class_incref(obd);
 396
 397         label = fsfilt_get_label(obd, mnt->mnt_sb);
 398         if (label)
 399                 CDEBUG(D_MGC, "MGC using disk labelled=%s\n", label);
 400
 401         /* We keep the cl_mgc_sem until mgc_fs_cleanup */
 402         RETURN(0);
 403
 404 err_ops:
 405         fsfilt_put_ops(obd->obd_fsops);
 406         obd->obd_fsops = NULL;
 407         cli->cl_mgc_vfsmnt = NULL;
 408         up(&cli->cl_mgc_sem);
 409         RETURN(err);
 410 }
 411
 412 static int mgc_fs_cleanup(struct obd_device *obd)
 413 {
 414         struct client_obd *cli = &obd->u.cli;
 415         int rc = 0;
 416         ENTRY;
 417
 418         LASSERT(cli->cl_mgc_vfsmnt != NULL);
 419
 420         if (cli->cl_mgc_configs_dir != NULL) {
 421                 struct lvfs_run_ctxt saved;
 422                 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 423                 l_dput(cli->cl_mgc_configs_dir);
 424                 cli->cl_mgc_configs_dir = NULL;
 425                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 426                 class_decref(obd);
 427         }
 428
 429         cli->cl_mgc_vfsmnt = NULL;
 430         if (obd->obd_fsops)
 431                 fsfilt_put_ops(obd->obd_fsops);
 432
 433         up(&cli->cl_mgc_sem);
 434
 435         RETURN(rc);
 436 }
 437
 438 static atomic_t mgc_count = ATOMIC_INIT(0);
 439 static int mgc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
 440 {
 441         int rc = 0;
 442         ENTRY;
 443
 444         switch (stage) {
 445         case OBD_CLEANUP_EARLY:
 446                 break;
 447         case OBD_CLEANUP_EXPORTS:
 448                 if (atomic_dec_and_test(&mgc_count)) {
 449                         /* Kick the requeue waitq - cld's should all be
 450                            stopping */
 451                         spin_lock(&config_list_lock);
 452                         rq_state |= RQ_STOP;
 453                         spin_unlock(&config_list_lock);
 454                         cfs_waitq_signal(&rq_waitq);
 455                 }
 456                 break;
 457         case OBD_CLEANUP_SELF_EXP:
 458                 rc = obd_llog_finish(obd, 0);
 459                 if (rc != 0)
 460                         CERROR("failed to cleanup llogging subsystems\n");
 461                 break;
 462         case OBD_CLEANUP_OBD:
 463                 break;
 464         }
 465         RETURN(rc);
 466 }
 467
 468 static int mgc_cleanup(struct obd_device *obd)
 469 {
 470         struct client_obd *cli = &obd->u.cli;
 471         int rc;
 472         ENTRY;
 473
 474         LASSERT(cli->cl_mgc_vfsmnt == NULL);
 475
 476         /* COMPAT_146 - old config logs may have added profiles we don't
 477            know about */
 478         if (obd->obd_type->typ_refcnt <= 1)
 479                 /* Only for the last mgc */
 480                 class_del_profiles();
 481
 482         ptlrpcd_decref();
 483
 484         rc = client_obd_cleanup(obd);
 485         RETURN(rc);
 486 }
 487
 488 static int mgc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 489 {
 490         int rc;
 491         ENTRY;
 492
 493         ptlrpcd_addref();
 494
 495         rc = client_obd_setup(obd, lcfg);
 496         if (rc)
 497                 GOTO(err_decref, rc);
 498
 499         rc = obd_llog_init(obd, NULL, obd, 0, NULL, NULL);
 500         if (rc) {
 501                 CERROR("failed to setup llogging subsystems\n");
 502                 GOTO(err_cleanup, rc);
 503         }
 504
 505         spin_lock(&config_list_lock);
 506         atomic_inc(&mgc_count);
 507         if (atomic_read(&mgc_count) == 1) {
 508                 rq_state &= ~RQ_STOP;
 509                 cfs_waitq_init(&rq_waitq);
 510         }
 511         spin_unlock(&config_list_lock);
 512
 513         RETURN(rc);
 514
 515 err_cleanup:
 516         client_obd_cleanup(obd);
 517 err_decref:
 518         ptlrpcd_decref();
 519         RETURN(rc);
 520 }
 521
 522 /* based on ll_mdc_blocking_ast */
 523 static int mgc_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
 524                             void *data, int flag)
 525 {
 526         struct lustre_handle lockh;
 527         struct config_llog_data *cld = (struct config_llog_data *)data;
 528         int rc = 0;
 529         ENTRY;
 530
 531         switch (flag) {
 532         case LDLM_CB_BLOCKING:
 533                 /* mgs wants the lock, give it up... */
 534                 LDLM_DEBUG(lock, "MGC blocking CB");
 535                 ldlm_lock2handle(lock, &lockh);
 536                 rc = ldlm_cli_cancel(&lockh);
 537                 break;
 538         case LDLM_CB_CANCELING: {
 539                 /* We've given up the lock, prepare ourselves to update. */
 540                 LDLM_DEBUG(lock, "MGC cancel CB");
 541
 542                 CDEBUG(D_MGC, "Lock res "LPX64" (%.8s)\n",
 543                        lock->l_resource->lr_name.name[0],
 544                        (char *)&lock->l_resource->lr_name.name[0]);
 545
 546                 if (!cld) {
 547                         CERROR("missing data, won't requeue\n");
 548                         break;
 549                 }
 550                 /* Are we done with this log? */
 551                 if (cld->cld_stopping) {
 552                         CDEBUG(D_MGC, "log %s: stopping, won't requeue\n",
 553                                cld->cld_logname);
 554                         config_log_put(cld);
 555                         break;
 556                 }
 557                 /* Make sure not to re-enqueue when the mgc is stopping
 558                    (we get called from client_disconnect_export) */
 559                 if (!lock->l_conn_export ||
 560                     !lock->l_conn_export->exp_obd->u.cli.cl_conn_count) {
 561                         CDEBUG(D_MGC, "log %s: disconnecting, won't requeue\n",
 562                                cld->cld_logname);
 563                         config_log_put(cld);
 564                         break;
 565                 }
 566                 /* Did we fail to get the lock? */
 567                 if (lock->l_req_mode != lock->l_granted_mode) {
 568                         CDEBUG(D_MGC, "log %s: original grant failed, will "
 569                                "requeue later\n", cld->cld_logname);
 570                         /* Try to re-enqueue later */
 571                         rc = mgc_requeue_add(cld, 1);
 572                         break;
 573                 }
 574                 /* Re-enqueue now */
 575                 rc = mgc_requeue_add(cld, 0);
 576                 break;
 577         }
 578         default:
 579                 LBUG();
 580         }
 581
 582
 583         if (rc) {
 584                 CERROR("%s CB failed %d:\n", flag == LDLM_CB_BLOCKING ?
 585                        "blocking" : "cancel", rc);
 586                 LDLM_ERROR(lock, "MGC ast");
 587         }
 588         RETURN(rc);
 589 }
 590
 591 /* Send parameter to MGS*/
 592 static int mgc_set_mgs_param(struct obd_export *exp,
 593                              struct mgs_send_param *msp)
 594 {
 595         struct ptlrpc_request *req;
 596         struct mgs_send_param *req_msp, *rep_msp;
 597         int size[] = { sizeof(struct ptlrpc_body), sizeof(*req_msp) };
 598         int rep_size[] = { sizeof(struct ptlrpc_body), sizeof(*msp) };
 599         int rc;
 600         ENTRY;
 601
 602         req = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_MGS_VERSION,
 603                               MGS_SET_INFO, 2, size, NULL);
 604         if (!req)
 605                 RETURN(-ENOMEM);
 606
 607         req_msp = lustre_msg_buf(req->rq_reqmsg, REQ_REC_OFF, sizeof(*req_msp));
 608         if (!req_msp)
 609                 RETURN(-ENOMEM);
 610
 611         memcpy(req_msp, msp, sizeof(*req_msp));
 612         ptlrpc_req_set_repsize(req, 2, rep_size);
 613         rc = ptlrpc_queue_wait(req);
 614         if (!rc) {
 615                 rep_msp = lustre_swab_repbuf(req, REPLY_REC_OFF,
 616                                              sizeof(*rep_msp), NULL);
 617                 memcpy(msp, rep_msp, sizeof(*rep_msp));
 618         }
 619
 620         ptlrpc_req_finished(req);
 621
 622         RETURN(rc);
 623 }
 624
 625 /* Take a config lock so we can get cancel notifications */
 626 static int mgc_enqueue(struct obd_export *exp, struct lov_stripe_md *lsm,
 627                        __u32 type, ldlm_policy_data_t *policy, __u32 mode,
 628                        int *flags, void *bl_cb, void *cp_cb, void *gl_cb,
 629                        void *data, __u32 lvb_len, void *lvb_swabber,
 630                        struct lustre_handle *lockh)
 631 {
 632         struct config_llog_data *cld = (struct config_llog_data *)data;
 633         struct ldlm_enqueue_info einfo = { type, mode, mgc_blocking_ast,
 634                 ldlm_completion_ast, NULL, data};
 635
 636         int rc;
 637         ENTRY;
 638
 639         CDEBUG(D_MGC, "Enqueue for %s (res "LPX64")\n", cld->cld_logname,
 640                cld->cld_resid.name[0]);
 641
 642         /* We can only drop this config log ref when we drop the lock */
 643         if (config_log_get(cld))
 644                 RETURN(ELDLM_LOCK_ABORTED);
 645
 646         /* We need a callback for every lockholder, so don't try to
 647            ldlm_lock_match (see rev 1.1.2.11.2.47) */
 648
 649         rc = ldlm_cli_enqueue(exp, NULL, &einfo, &cld->cld_resid,
 650                               NULL, flags, NULL, 0, NULL, lockh, 0);
 651         /* A failed enqueue should still call the mgc_blocking_ast,
 652            where it will be requeued if needed ("grant failed"). */
 653
 654         RETURN(rc);
 655 }
 656
 657 static int mgc_cancel(struct obd_export *exp, struct lov_stripe_md *md,
 658                       __u32 mode, struct lustre_handle *lockh)
 659 {
 660         ENTRY;
 661
 662         ldlm_lock_decref(lockh, mode);
 663
 664         RETURN(0);
 665 }
 666
 667 #if 0
 668 static int mgc_iocontrol(unsigned int cmd, struct obd_export *exp, int len,
 669                          void *karg, void *uarg)
 670 {
 671         struct obd_device *obd = exp->exp_obd;
 672         struct obd_ioctl_data *data = karg;
 673         struct llog_ctxt *ctxt;
 674         struct lvfs_run_ctxt saved;
 675         int rc;
 676         ENTRY;
 677
 678 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 679         MOD_INC_USE_COUNT;
 680 #else
 681         if (!try_module_get(THIS_MODULE)) {
 682                 CERROR("Can't get module. Is it alive?");
 683                 return -EINVAL;
 684         }
 685 #endif
 686         switch (cmd) {
 687         /* REPLicator context */
 688         case OBD_IOC_PARSE: {
 689                 CERROR("MGC parsing llog %s\n", data->ioc_inlbuf1);
 690                 ctxt = llog_get_context(exp->exp_obd, LLOG_CONFIG_REPL_CTXT);
 691                 rc = class_config_parse_llog(ctxt, data->ioc_inlbuf1, NULL);
 692                 GOTO(out, rc);
 693         }
 694 #ifdef __KERNEL__
 695         case OBD_IOC_LLOG_INFO:
 696         case OBD_IOC_LLOG_PRINT: {
 697                 ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
 698                 rc = llog_ioctl(ctxt, cmd, data);
 699
 700                 GOTO(out, rc);
 701         }
 702 #endif
 703         /* ORIGinator context */
 704         case OBD_IOC_DUMP_LOG: {
 705                 ctxt = llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT);
 706                 push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 707                 rc = class_config_dump_llog(ctxt, data->ioc_inlbuf1, NULL);
 708                 pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 709                 if (rc)
 710                         RETURN(rc);
 711
 712                 GOTO(out, rc);
 713         }
 714         default:
 715                 CERROR("mgc_ioctl(): unrecognised ioctl %#x\n", cmd);
 716                 GOTO(out, rc = -ENOTTY);
 717         }
 718 out:
 719 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
 720         MOD_DEC_USE_COUNT;
 721 #else
 722         module_put(THIS_MODULE);
 723 #endif
 724
 725         return rc;
 726 }
 727 #endif
 728
 729 /* Send target_reg message to MGS */
 730 static int mgc_target_register(struct obd_export *exp,
 731                                struct mgs_target_info *mti)
 732 {
 733         struct ptlrpc_request *req;
 734         struct mgs_target_info *req_mti, *rep_mti;
 735         int size[] = { sizeof(struct ptlrpc_body), sizeof(*req_mti) };
 736         int rep_size[] = { sizeof(struct ptlrpc_body), sizeof(*mti) };
 737         int rc;
 738         ENTRY;
 739
 740         req = ptlrpc_prep_req(class_exp2cliimp(exp), LUSTRE_MGS_VERSION,
 741                               MGS_TARGET_REG, 2, size, NULL);
 742         if (!req)
 743                 RETURN(-ENOMEM);
 744
 745         req_mti = lustre_msg_buf(req->rq_reqmsg, REQ_REC_OFF, sizeof(*req_mti));
 746         if (!req_mti)
 747                 RETURN(-ENOMEM);
 748         memcpy(req_mti, mti, sizeof(*req_mti));
 749
 750         ptlrpc_req_set_repsize(req, 2, rep_size);
 751
 752         CDEBUG(D_MGC, "register %s\n", mti->mti_svname);
 753
 754         rc = ptlrpc_queue_wait(req);
 755         if (!rc) {
 756                 rep_mti = lustre_swab_repbuf(req, REPLY_REC_OFF,
 757                                              sizeof(*rep_mti),
 758                                              lustre_swab_mgs_target_info);
 759                 memcpy(mti, rep_mti, sizeof(*rep_mti));
 760                 CDEBUG(D_MGC, "register %s got index = %d\n",
 761                        mti->mti_svname, mti->mti_stripe_index);
 762         }
 763         ptlrpc_req_finished(req);
 764
 765         RETURN(rc);
 766 }
 767
 768 int mgc_reconnect_import(struct obd_import *imp)
 769 {
 770         /* Force a new connect attempt */
 771         ptlrpc_invalidate_import(imp);
 772         /* Do a fresh connect next time by zeroing the handle */
 773         ptlrpc_disconnect_import(imp, 1);
 774         /* Wait for all invalidate calls to finish */
 775         if (atomic_read(&imp->imp_inval_count) > 0) {
 776                 int rc;
 777                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
 778                 rc = l_wait_event(imp->imp_recovery_waitq,
 779                                   (atomic_read(&imp->imp_inval_count) == 0),
 780                                   &lwi);
 781                 if (rc)
 782                         CERROR("Interrupted, inval=%d\n",
 783                                atomic_read(&imp->imp_inval_count));
 784         }
 785
 786         /* Allow reconnect attempts */
 787         imp->imp_obd->obd_no_recov = 0;
 788         /* Remove 'invalid' flag */
 789         ptlrpc_activate_import(imp);
 790         /* Attempt a new connect */
 791         ptlrpc_recover_import(imp, NULL);
 792         return 0;
 793 }
 794
 795 int mgc_set_info_async(struct obd_export *exp, obd_count keylen,
 796                        void *key, obd_count vallen, void *val,
 797                        struct ptlrpc_request_set *set)
 798 {
 799         struct obd_import *imp = class_exp2cliimp(exp);
 800         int rc = -EINVAL;
 801         ENTRY;
 802
 803         /* Try to "recover" the initial connection; i.e. retry */
 804         if (KEY_IS(KEY_INIT_RECOV)) {
 805                 if (vallen != sizeof(int))
 806                         RETURN(-EINVAL);
 807                 spin_lock(&imp->imp_lock);
 808                 imp->imp_initial_recov = *(int *)val;
 809                 spin_unlock(&imp->imp_lock);
 810                 CDEBUG(D_HA, "%s: set imp_initial_recov = %d\n",
 811                        exp->exp_obd->obd_name, imp->imp_initial_recov);
 812                 RETURN(0);
 813         }
 814         /* Turn off initial_recov after we try all backup servers once */
 815         if (KEY_IS(KEY_INIT_RECOV_BACKUP)) {
 816                 int value;
 817                 if (vallen != sizeof(int))
 818                         RETURN(-EINVAL);
 819                 value = *(int *)val;
 820                 spin_lock(&imp->imp_lock);
 821                 imp->imp_initial_recov_bk = value > 0;
 822                 /* Even after the initial connection, give up all comms if
 823                    nobody answers the first time. */
 824                 imp->imp_recon_bk = 1;
 825                 spin_unlock(&imp->imp_lock);
 826                 CDEBUG(D_MGC, "InitRecov %s %d/%d:d%d:i%d:r%d:or%d:%s\n",
 827                        imp->imp_obd->obd_name, value, imp->imp_initial_recov,
 828                        imp->imp_deactive, imp->imp_invalid,
 829                        imp->imp_replayable, imp->imp_obd->obd_replayable,
 830                        ptlrpc_import_state_name(imp->imp_state));
 831                 /* Resurrect if we previously died */
 832                 if (imp->imp_invalid || value > 1)
 833                         mgc_reconnect_import(imp);
 834                 RETURN(0);
 835         }
 836         /* FIXME move this to mgc_process_config */
 837         if (KEY_IS("register_target")) {
 838                 struct mgs_target_info *mti;
 839                 if (vallen != sizeof(struct mgs_target_info))
 840                         RETURN(-EINVAL);
 841                 mti = (struct mgs_target_info *)val;
 842                 CDEBUG(D_MGC, "register_target %s %#x\n",
 843                        mti->mti_svname, mti->mti_flags);
 844                 rc =  mgc_target_register(exp, mti);
 845                 RETURN(rc);
 846         }
 847         if (KEY_IS("set_fs")) {
 848                 struct super_block *sb = (struct super_block *)val;
 849                 struct lustre_sb_info *lsi;
 850                 if (vallen != sizeof(struct super_block))
 851                         RETURN(-EINVAL);
 852                 lsi = s2lsi(sb);
 853                 rc = mgc_fs_setup(exp->exp_obd, sb, lsi->lsi_srv_mnt);
 854                 if (rc) {
 855                         CERROR("set_fs got %d\n", rc);
 856                 }
 857                 RETURN(rc);
 858         }
 859         if (KEY_IS("clear_fs")) {
 860                 if (vallen != 0)
 861                         RETURN(-EINVAL);
 862                 rc = mgc_fs_cleanup(exp->exp_obd);
 863                 if (rc) {
 864                         CERROR("clear_fs got %d\n", rc);
 865                 }
 866                 RETURN(rc);
 867         }
 868         if (KEY_IS(KEY_SET_INFO)) {
 869                 struct mgs_send_param *msp;
 870
 871                 msp = (struct mgs_send_param *)val;
 872                 rc =  mgc_set_mgs_param(exp, msp);
 873                 RETURN(rc);
 874         }
 875
 876         RETURN(rc);
 877 }
 878
 879 static int mgc_import_event(struct obd_device *obd,
 880                             struct obd_import *imp,
 881                             enum obd_import_event event)
 882 {
 883         int rc = 0;
 884
 885         LASSERT(imp->imp_obd == obd);
 886         CDEBUG(D_MGC, "import event %#x\n", event);
 887
 888         switch (event) {
 889         case IMP_EVENT_DISCON:
 890                 /* MGC imports should not wait for recovery */
 891                 ptlrpc_invalidate_import(imp);
 892                 break;
 893         case IMP_EVENT_INACTIVE:
 894                 break;
 895         case IMP_EVENT_INVALIDATE: {
 896                 struct ldlm_namespace *ns = obd->obd_namespace;
 897                 ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY);
 898                 break;
 899         }
 900         case IMP_EVENT_ACTIVE:
 901                 LCONSOLE_WARN("%s: Reactivating import\n", obd->obd_name);
 902                 break;
 903         case IMP_EVENT_OCD:
 904                 break;
 905         default:
 906                 CERROR("Unknown import event %#x\n", event);
 907                 LBUG();
 908         }
 909         RETURN(rc);
 910 }
 911
 912 static int mgc_llog_init(struct obd_device *obd, struct obd_llogs *llogs,
 913                          struct obd_device *tgt, int count,
 914                          struct llog_catid *logid, struct obd_uuid *uuid)
 915 {
 916         struct llog_ctxt *ctxt;
 917         int rc;
 918         ENTRY;
 919
 920         rc = llog_setup(obd, llogs, LLOG_CONFIG_ORIG_CTXT, tgt, 0, NULL,
 921                         &llog_lvfs_ops);
 922         if (rc)
 923                 RETURN(rc);
 924
 925         rc = llog_setup(obd, llogs, LLOG_CONFIG_REPL_CTXT, tgt, 0, NULL,
 926                         &llog_client_ops);
 927         if (rc == 0) {
 928                 ctxt = llog_get_context(obd, LLOG_CONFIG_REPL_CTXT);
 929                 ctxt->loc_imp = obd->u.cli.cl_import;
 930         }
 931
 932         RETURN(rc);
 933 }
 934
 935 static int mgc_llog_finish(struct obd_device *obd, int count)
 936 {
 937         int rc;
 938         ENTRY;
 939
 940         rc = llog_cleanup(llog_get_context(obd, LLOG_CONFIG_REPL_CTXT));
 941         rc = llog_cleanup(llog_get_context(obd, LLOG_CONFIG_ORIG_CTXT));
 942
 943         RETURN(rc);
 944 }
 945
 946 /* identical to mgs_log_is_empty */
 947 static int mgc_llog_is_empty(struct obd_device *obd, struct llog_ctxt *ctxt,
 948                             char *name)
 949 {
 950         struct lvfs_run_ctxt saved;
 951         struct llog_handle *llh;
 952         int rc = 0;
 953
 954         push_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 955         rc = llog_create(ctxt, &llh, NULL, name);
 956         if (rc == 0) {
 957                 llog_init_handle(llh, LLOG_F_IS_PLAIN, NULL);
 958                 rc = llog_get_size(llh);
 959                 llog_close(llh);
 960         }
 961         pop_ctxt(&saved, &obd->obd_lvfs_ctxt, NULL);
 962         /* header is record 1 */
 963         return(rc <= 1);
 964 }
 965
 966 static int mgc_copy_handler(struct llog_handle *llh, struct llog_rec_hdr *rec,
 967                             void *data)
 968 {
 969         struct llog_rec_hdr local_rec = *rec;
 970         struct llog_handle *local_llh = (struct llog_handle *)data;
 971         char *cfg_buf = (char*) (rec + 1);
 972         struct lustre_cfg *lcfg;
 973         int rc = 0;
 974         ENTRY;
 975
 976         /* Append all records */
 977         local_rec.lrh_len -= sizeof(*rec) + sizeof(struct llog_rec_tail);
 978         rc = llog_write_rec(local_llh, &local_rec, NULL, 0,
 979                             (void *)cfg_buf, -1);
 980
 981         lcfg = (struct lustre_cfg *)cfg_buf;
 982         CDEBUG(D_INFO, "idx=%d, rc=%d, len=%d, cmd %x %s %s\n",
 983                rec->lrh_index, rc, rec->lrh_len, lcfg->lcfg_command,
 984                lustre_cfg_string(lcfg, 0), lustre_cfg_string(lcfg, 1));
 985
 986         RETURN(rc);
 987 }
 988
 989 /* Copy a remote log locally */
 990 static int mgc_copy_llog(struct obd_device *obd, struct llog_ctxt *rctxt,
 991                          struct llog_ctxt *lctxt, char *logname)
 992 {
 993         struct llog_handle *local_llh, *remote_llh;
 994         struct obd_uuid *uuid;
 995         char *temp_log;
 996         int rc, rc2;
 997         ENTRY;
 998
 999         /* Write new log to a temp name, then vfs_rename over logname
1000            upon successful completion. */
1001
1002         OBD_ALLOC(temp_log, strlen(logname) + 1);
1003         if (!temp_log)
1004                 RETURN(-ENOMEM);
1005         sprintf(temp_log, "%sT", logname);
1006
1007         /* Make sure there's no old temp log */
1008         rc = llog_create(lctxt, &local_llh, NULL, temp_log);
1009         if (rc)
1010                 GOTO(out, rc);
1011         rc = llog_init_handle(local_llh, LLOG_F_IS_PLAIN, NULL);
1012         if (rc)
1013                 GOTO(out, rc);
1014         rc = llog_destroy(local_llh);
1015         llog_free_handle(local_llh);
1016         if (rc)
1017                 GOTO(out, rc);
1018
1019         /* open local log */
1020         rc = llog_create(lctxt, &local_llh, NULL, temp_log);
1021         if (rc)
1022                 GOTO(out, rc);
1023
1024         /* set the log header uuid for fun */
1025         OBD_ALLOC_PTR(uuid);
1026         obd_str2uuid(uuid, logname);
1027         rc = llog_init_handle(local_llh, LLOG_F_IS_PLAIN, uuid);
1028         OBD_FREE_PTR(uuid);
1029         if (rc)
1030                 GOTO(out_closel, rc);
1031
1032         /* open remote log */
1033         rc = llog_create(rctxt, &remote_llh, NULL, logname);
1034         if (rc)
1035                 GOTO(out_closel, rc);
1036         rc = llog_init_handle(remote_llh, LLOG_F_IS_PLAIN, NULL);
1037         if (rc)
1038                 GOTO(out_closer, rc);
1039
1040         /* Copy remote log */
1041         rc = llog_process(remote_llh, mgc_copy_handler,(void *)local_llh, NULL);
1042
1043 out_closer:
1044         rc2 = llog_close(remote_llh);
1045         if (!rc)
1046                 rc = rc2;
1047 out_closel:
1048         rc2 = llog_close(local_llh);
1049         if (!rc)
1050                 rc = rc2;
1051
1052         /* We've copied the remote log to the local temp log, now
1053            replace the old local log with the temp log. */
1054         if (!rc) {
1055                 struct client_obd *cli = &obd->u.cli;
1056                 LASSERT(cli);
1057                 LASSERT(cli->cl_mgc_configs_dir);
1058                 rc = lustre_rename(cli->cl_mgc_configs_dir, temp_log, logname);
1059         }
1060         CDEBUG(D_MGC, "Copied remote log %s (%d)\n", logname, rc);
1061 out:
1062         if (rc)
1063                 CERROR("Failed to copy remote log %s (%d)\n", logname, rc);
1064         OBD_FREE(temp_log, strlen(logname) + 1);
1065         RETURN(rc);
1066 }
1067
1068 DECLARE_MUTEX(llog_process_lock);
1069
1070 /* Get a config log from the MGS and process it.
1071    This func is called for both clients and servers. */
1072 static int mgc_process_log(struct obd_device *mgc,
1073                            struct config_llog_data *cld)
1074 {
1075         struct llog_ctxt *ctxt, *lctxt;
1076         struct lustre_handle lockh;
1077         struct client_obd *cli = &mgc->u.cli;
1078         struct lvfs_run_ctxt saved;
1079         struct lustre_sb_info *lsi;
1080         int rc = 0, rcl, flags = 0, must_pop = 0;
1081         ENTRY;
1082
1083         if (!cld || !cld->cld_cfg.cfg_sb) {
1084                 /* This should never happen */
1085                 CERROR("Missing cld, aborting log update\n");
1086                 RETURN(-EINVAL);
1087         }
1088         if (cld->cld_stopping)
1089                 RETURN(0);
1090
1091         OBD_FAIL_TIMEOUT(OBD_FAIL_MGC_PROCESS_LOG, 20);
1092
1093         lsi = s2lsi(cld->cld_cfg.cfg_sb);
1094
1095         CDEBUG(D_MGC, "Process log %s:%s from %d\n", cld->cld_logname,
1096                cld->cld_cfg.cfg_instance, cld->cld_cfg.cfg_last_idx + 1);
1097
1098         ctxt = llog_get_context(mgc, LLOG_CONFIG_REPL_CTXT);
1099         if (!ctxt) {
1100                 CERROR("missing llog context\n");
1101                 RETURN(-EINVAL);
1102         }
1103
1104         /* I don't want mutliple processes running process_log at once --
1105            sounds like badness.  It actually might be fine, as long as
1106            we're not trying to update from the same log
1107            simultaneously (in which case we should use a per-log sem.) */
1108         down(&llog_process_lock);
1109
1110         /* Get the cfg lock on the llog */
1111         rcl = mgc_enqueue(mgc->u.cli.cl_mgc_mgsexp, NULL, LDLM_PLAIN, NULL,
1112                           LCK_CR, &flags, NULL, NULL, NULL,
1113                           cld, 0, NULL, &lockh);
1114         if (rcl)
1115                 CDEBUG(D_MGC, "Can't get cfg lock: %d\n", rcl);
1116
1117         lctxt = llog_get_context(mgc, LLOG_CONFIG_ORIG_CTXT);
1118
1119         /* Copy the setup log locally if we can. Don't mess around if we're
1120            running an MGS though (logs are already local). */
1121         if (lctxt && lsi && (lsi->lsi_flags & LSI_SERVER) &&
1122             (lsi->lsi_srv_mnt == cli->cl_mgc_vfsmnt) &&
1123             !IS_MGS(lsi->lsi_ldd)) {
1124                 push_ctxt(&saved, &mgc->obd_lvfs_ctxt, NULL);
1125                 must_pop++;
1126                 if (rcl == 0)
1127                         /* Only try to copy log if we have the lock. */
1128                         rc = mgc_copy_llog(mgc, ctxt, lctxt, cld->cld_logname);
1129                 if (rcl || rc) {
1130                         if (mgc_llog_is_empty(mgc, lctxt, cld->cld_logname)) {
1131                                 LCONSOLE_ERROR_MSG(0x13a, "Failed to get MGS "
1132                                                    "log %s and no local copy."
1133                                                    "\n", cld->cld_logname);
1134                                 GOTO(out_pop, rc = -ENOTCONN);
1135                         }
1136                         LCONSOLE_WARN("Failed to get MGS log %s, using "
1137                                       "local copy.\n", cld->cld_logname);
1138                 }
1139                 /* Now, whether we copied or not, start using the local llog.
1140                    If we failed to copy, we'll start using whatever the old
1141                    log has. */
1142                 ctxt = lctxt;
1143         }
1144
1145         /* logname and instance info should be the same, so use our
1146            copy of the instance for the update.  The cfg_last_idx will
1147            be updated here. */
1148         rc = class_config_parse_llog(ctxt, cld->cld_logname, &cld->cld_cfg);
1149
1150  out_pop:
1151         if (must_pop)
1152                 pop_ctxt(&saved, &mgc->obd_lvfs_ctxt, NULL);
1153
1154         /* Now drop the lock so MGS can revoke it */
1155         if (!rcl) {
1156                 rcl = mgc_cancel(mgc->u.cli.cl_mgc_mgsexp, NULL,
1157                                  LCK_CR, &lockh);
1158                 if (rcl)
1159                         CERROR("Can't drop cfg lock: %d\n", rcl);
1160         }
1161
1162         CDEBUG(D_MGC, "%s: configuration from log '%s' %sed (%d).\n",
1163                mgc->obd_name, cld->cld_logname, rc ? "fail" : "succeed", rc);
1164
1165         up(&llog_process_lock);
1166
1167         RETURN(rc);
1168 }
1169
1170 static int mgc_process_config(struct obd_device *obd, obd_count len, void *buf)
1171 {
1172         struct lustre_cfg *lcfg = buf;
1173         int cmd;
1174         int rc = 0;
1175         ENTRY;
1176
1177         switch(cmd = lcfg->lcfg_command) {
1178         case LCFG_LOV_ADD_OBD: {
1179                 /* Add any new target, not just osts */
1180                 struct mgs_target_info *mti;
1181
1182                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) !=
1183                     sizeof(struct mgs_target_info))
1184                         GOTO(out, rc = -EINVAL);
1185
1186                 mti = (struct mgs_target_info *)lustre_cfg_buf(lcfg, 1);
1187                 CDEBUG(D_MGC, "add_target %s %#x\n",
1188                        mti->mti_svname, mti->mti_flags);
1189                 rc = mgc_target_register(obd->u.cli.cl_mgc_mgsexp, mti);
1190                 break;
1191         }
1192         case LCFG_LOV_DEL_OBD:
1193                 /* Remove target from the fs? */
1194                 /* FIXME */
1195                 CERROR("lov_del_obd unimplemented\n");
1196                 rc = -ENOSYS;
1197                 break;
1198         case LCFG_LOG_START: {
1199                 struct config_llog_data *cld;
1200                 struct config_llog_instance *cfg;
1201                 struct super_block *sb;
1202                 char *logname = lustre_cfg_string(lcfg, 1);
1203                 cfg = (struct config_llog_instance *)lustre_cfg_buf(lcfg, 2);
1204                 sb = *(struct super_block **)lustre_cfg_buf(lcfg, 3);
1205
1206                 CDEBUG(D_MGC, "parse_log %s from %d\n", logname,
1207                        cfg->cfg_last_idx);
1208
1209                 /* We're only called through here on the initial mount */
1210                 rc = config_log_add(logname, cfg, sb);
1211                 if (rc)
1212                         break;
1213                 cld = config_log_find(logname, cfg);
1214                 if (IS_ERR(cld)) {
1215                         rc = PTR_ERR(cld);
1216                         break;
1217                 }
1218
1219                 /* COMPAT_146 */
1220                 /* FIXME only set this for old logs!  Right now this forces
1221                    us to always skip the "inside markers" check */
1222                 cld->cld_cfg.cfg_flags |= CFG_F_COMPAT146;
1223
1224                 rc = mgc_process_log(obd, cld);
1225                 config_log_put(cld);
1226
1227                 break;
1228         }
1229         case LCFG_LOG_END: {
1230                 struct config_llog_instance *cfg = NULL;
1231                 char *logname = lustre_cfg_string(lcfg, 1);
1232                 if (lcfg->lcfg_bufcount >= 2)
1233                         cfg = (struct config_llog_instance *)lustre_cfg_buf(
1234                                 lcfg, 2);
1235                 rc = config_log_end(logname, cfg);
1236                 break;
1237         }
1238         default: {
1239                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1240                 GOTO(out, rc = -EINVAL);
1241
1242         }
1243         }
1244 out:
1245         RETURN(rc);
1246 }
1247
1248 struct obd_ops mgc_obd_ops = {
1249         .o_owner        = THIS_MODULE,
1250         .o_setup        = mgc_setup,
1251         .o_precleanup   = mgc_precleanup,
1252         .o_cleanup      = mgc_cleanup,
1253         .o_add_conn     = client_import_add_conn,
1254         .o_del_conn     = client_import_del_conn,
1255         .o_connect      = client_connect_import,
1256         .o_disconnect   = client_disconnect_export,
1257         //.o_enqueue      = mgc_enqueue,
1258         .o_cancel       = mgc_cancel,
1259         //.o_iocontrol    = mgc_iocontrol,
1260         .o_set_info_async = mgc_set_info_async,
1261         .o_import_event = mgc_import_event,
1262         .o_llog_init    = mgc_llog_init,
1263         .o_llog_finish  = mgc_llog_finish,
1264         .o_process_config = mgc_process_config,
1265 };
1266
1267 int __init mgc_init(void)
1268 {
1269         return class_register_type(&mgc_obd_ops, NULL, NULL,
1270                                    LUSTRE_MGC_NAME, NULL);
1271 }
1272
1273 #ifdef __KERNEL__
1274 static void /*__exit*/ mgc_exit(void)
1275 {
1276         class_unregister_type(LUSTRE_MGC_NAME);
1277 }
1278
1279 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1280 MODULE_DESCRIPTION("Lustre Management Client");
1281 MODULE_LICENSE("GPL");
1282
1283 module_init(mgc_init);
1284 module_exit(mgc_exit);
1285 #endif