lustre/ptlrpc/recover.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Portal-RPC reconnection and replay operations, for use in recovery.
   5  *
   6  *  Copyright (c) 2002, 2003 Cluster File Systems, Inc.
   7  *   Author: Mike Shaver <shaver@clusterfs.com>
   8  *
   9  *   This file is part of Lustre, http://www.lustre.org.
  10  *
  11  *   Lustre is free software; you can redistribute it and/or
  12  *   modify it under the terms of version 2 of the GNU General Public
  13  *   License as published by the Free Software Foundation.
  14  *
  15  *   Lustre is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *   GNU General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU General Public License
  21  *   along with Lustre; if not, write to the Free Software
  22  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 #define DEBUG_SUBSYSTEM S_RPC
  26 #ifdef __KERNEL__
  27 # include <linux/config.h>
  28 # include <linux/module.h>
  29 # include <linux/kmod.h>
  30 #else
  31 # include <liblustre.h>
  32 #endif
  33
  34 #include <linux/obd_support.h>
  35 #include <linux/lustre_ha.h>
  36 #include <linux/lustre_net.h>
  37 #include <linux/lustre_import.h>
  38 #include <linux/lustre_export.h>
  39 #include <linux/obd.h>
  40 #include <linux/obd_ost.h>
  41 #include <linux/obd_class.h>
  42 #include <linux/obd_lov.h> /* for IOC_LOV_SET_OSC_ACTIVE */
  43
  44 #include "ptlrpc_internal.h"
  45
  46 static int ptlrpc_recover_import_no_retry(struct obd_import *, char *);
  47
  48 void ptlrpc_run_recovery_over_upcall(struct obd_device *obd)
  49 {
  50         char *argv[4];
  51         char *envp[3];
  52         int rc;
  53
  54         ENTRY;
  55         argv[0] = obd_lustre_upcall;
  56         argv[1] = "RECOVERY_OVER";
  57         argv[2] = obd->obd_uuid.uuid;
  58         argv[3] = NULL;
  59
  60         envp[0] = "HOME=/";
  61         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
  62         envp[2] = NULL;
  63
  64         rc = USERMODEHELPER(argv[0], argv, envp);
  65         if (rc < 0) {
  66                 CERROR("Error invoking recovery upcall %s %s %s: %d; check "
  67                        "/proc/sys/lustre/upcall\n",
  68                        argv[0], argv[1], argv[2], rc);
  69
  70         } else {
  71                 CERROR("Invoked upcall %s %s %s",
  72                        argv[0], argv[1], argv[2]);
  73         }
  74 }
  75
  76 void ptlrpc_run_failed_import_upcall(struct obd_import* imp)
  77 {
  78 #ifdef __KERNEL__
  79         char *argv[7];
  80         char *envp[3];
  81         int rc;
  82
  83         ENTRY;
  84         argv[0] = obd_lustre_upcall;
  85         argv[1] = "FAILED_IMPORT";
  86         argv[2] = imp->imp_target_uuid.uuid;
  87         argv[3] = imp->imp_obd->obd_name;
  88         argv[4] = imp->imp_connection->c_remote_uuid.uuid;
  89         argv[5] = imp->imp_obd->obd_uuid.uuid;
  90         argv[6] = NULL;
  91
  92         envp[0] = "HOME=/";
  93         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
  94         envp[2] = NULL;
  95
  96         rc = USERMODEHELPER(argv[0], argv, envp);
  97         if (rc < 0) {
  98                 CERROR("Error invoking recovery upcall %s %s %s %s %s: %d; "
  99                        "check /proc/sys/lustre/lustre_upcall\n",
 100                        argv[0], argv[1], argv[2], argv[3], argv[4],rc);
 101
 102         } else {
 103                 CERROR("Invoked upcall %s %s %s %s %s\n",
 104                        argv[0], argv[1], argv[2], argv[3], argv[4]);
 105         }
 106 #else
 107         ptlrpc_recover_import(imp, NULL);
 108 #endif
 109 }
 110
 111 int ptlrpc_replay(struct obd_import *imp)
 112 {
 113         int rc = 0;
 114         struct list_head *tmp, *pos;
 115         struct ptlrpc_request *req;
 116         unsigned long flags;
 117         ENTRY;
 118
 119         /* It might have committed some after we last spoke, so make sure we
 120          * get rid of them now.
 121          */
 122         spin_lock_irqsave(&imp->imp_lock, flags);
 123         ptlrpc_free_committed(imp);
 124         spin_unlock_irqrestore(&imp->imp_lock, flags);
 125
 126         CDEBUG(D_HA, "import %p from %s has committed "LPD64"\n",
 127                imp, imp->imp_target_uuid.uuid, imp->imp_peer_committed_transno);
 128
 129         list_for_each(tmp, &imp->imp_replay_list) {
 130                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 131                 DEBUG_REQ(D_HA, req, "RETAINED: ");
 132         }
 133
 134         /* Do I need to hold a lock across this iteration?  We shouldn't be
 135          * racing with any additions to the list, because we're in recovery
 136          * and are therefore not processing additional requests to add.  Calls
 137          * to ptlrpc_free_committed might commit requests, but nothing "newer"
 138          * than the one we're replaying (it can't be committed until it's
 139          * replayed, and we're doing that here).  l_f_e_safe protects against
 140          * problems with the current request being committed, in the unlikely
 141          * event of that race.  So, in conclusion, I think that it's safe to
 142          * perform this list-walk without the imp_lock held.
 143          *
 144          * But, the {mdc,osc}_replay_open callbacks both iterate
 145          * request lists, and have comments saying they assume the
 146          * imp_lock is being held by ptlrpc_replay, but it's not. it's
 147          * just a little race...
 148          */
 149         list_for_each_safe(tmp, pos, &imp->imp_replay_list) {
 150                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 151
 152                 DEBUG_REQ(D_HA, req, "REPLAY:");
 153
 154                 rc = ptlrpc_replay_req(req);
 155
 156                 if (rc) {
 157                         CERROR("recovery replay error %d for req "LPD64"\n",
 158                                rc, req->rq_xid);
 159                         RETURN(rc);
 160                 }
 161         }
 162
 163         RETURN(0);
 164 }
 165
 166 int ptlrpc_resend(struct obd_import *imp)
 167 {
 168         struct list_head *tmp, *pos;
 169         struct ptlrpc_request *req;
 170         unsigned long flags;
 171
 172         ENTRY;
 173
 174         /* As long as we're in recovery, nothing should be added to the sending
 175          * list, so we don't need to hold the lock during this iteration and
 176          * resend process.
 177          */
 178         /* Well... what if lctl recover is called twice at the same time?
 179          */
 180         spin_lock_irqsave(&imp->imp_lock, flags);
 181         LASSERT(imp->imp_state == LUSTRE_IMP_RECOVER);
 182         spin_unlock_irqrestore(&imp->imp_lock, flags);
 183
 184         list_for_each_safe(tmp, pos, &imp->imp_sending_list) {
 185                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 186                 ptlrpc_resend_req(req);
 187         }
 188
 189         RETURN(0);
 190 }
 191
 192 void ptlrpc_wake_delayed(struct obd_import *imp)
 193 {
 194         unsigned long flags;
 195         struct list_head *tmp, *pos;
 196         struct ptlrpc_request *req;
 197
 198         spin_lock_irqsave(&imp->imp_lock, flags);
 199         list_for_each_safe(tmp, pos, &imp->imp_delayed_list) {
 200                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 201
 202                 ptlrpc_put_connection(req->rq_connection);
 203                 req->rq_connection =
 204                        ptlrpc_connection_addref(req->rq_import->imp_connection);
 205
 206                 if (req->rq_set) {
 207                         DEBUG_REQ(D_HA, req, "waking (set %p):", req->rq_set);
 208                         wake_up(&req->rq_set->set_waitq);
 209                 } else {
 210                         DEBUG_REQ(D_HA, req, "waking:");
 211                         wake_up(&req->rq_reply_waitq);
 212                 }
 213         }
 214         spin_unlock_irqrestore(&imp->imp_lock, flags);
 215 }
 216
 217 inline void ptlrpc_invalidate_import_state(struct obd_import *imp)
 218 {
 219         struct obd_device *obd = imp->imp_obd;
 220         struct ldlm_namespace *ns = obd->obd_namespace;
 221
 222         ptlrpc_abort_inflight(imp);
 223
 224 #if 0
 225         obd_invalidate_import(obd, imp);
 226 #endif
 227
 228         ldlm_namespace_cleanup(ns, LDLM_FL_LOCAL_ONLY | LDLM_FL_CANCEL);
 229 }
 230
 231 void ptlrpc_handle_failed_import(struct obd_import *imp)
 232 {
 233         ENTRY;
 234         if (!imp->imp_replayable) {
 235                 CDEBUG(D_HA,
 236                        "import %s@%s for %s not replayable, deactivating\n",
 237                        imp->imp_target_uuid.uuid,
 238                        imp->imp_connection->c_remote_uuid.uuid,
 239                        imp->imp_obd->obd_name);
 240                 ptlrpc_set_import_active(imp, 0);
 241         }
 242
 243         ptlrpc_run_failed_import_upcall(imp);
 244         EXIT;
 245 }
 246
 247 void ptlrpc_request_handle_notconn(struct ptlrpc_request *failed_req)
 248 {
 249         int rc;
 250         struct obd_import *imp= failed_req->rq_import;
 251         unsigned long flags;
 252         ENTRY;
 253
 254         CDEBUG(D_HA, "import %s of %s@%s abruptly disconnected: reconnecting\n",
 255                imp->imp_obd->obd_name,
 256                imp->imp_target_uuid.uuid,
 257                imp->imp_connection->c_remote_uuid.uuid);
 258
 259         rc = ptlrpc_recover_import_no_retry(imp, NULL);
 260
 261         if (failed_req->rq_import_generation != imp->imp_generation) {
 262                 spin_lock_irqsave (&failed_req->rq_lock, flags);
 263                 failed_req->rq_err = 1;
 264                 spin_unlock_irqrestore (&failed_req->rq_lock, flags);
 265         }
 266         else {
 267                 ptlrpc_resend_req(failed_req);
 268                 if (rc && rc != -EALREADY)
 269                         ptlrpc_handle_failed_import(imp);
 270
 271         }
 272         EXIT;
 273 }
 274
 275 int ptlrpc_set_import_active(struct obd_import *imp, int active)
 276 {
 277         struct obd_device *obd = imp->imp_obd;
 278         unsigned long flags;
 279
 280         LASSERT(obd);
 281
 282         /* When deactivating, mark import invalid, and abort in-flight
 283          * requests. */
 284         if (!active) {
 285                 spin_lock_irqsave(&imp->imp_lock, flags);
 286                 /* This is a bit of a hack, but invalidating replayable
 287                  * imports makes a temporary reconnect failure into a much more
 288                  * ugly -- and hard to remedy -- situation. */
 289                 if (!imp->imp_replayable) {
 290                         CDEBUG(D_HA, "setting import %s INVALID\n",
 291                                imp->imp_target_uuid.uuid);
 292                         imp->imp_invalid = 1;
 293                 }
 294                 imp->imp_generation++;
 295                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 296                 ptlrpc_invalidate_import_state(imp);
 297         }
 298
 299         /* When activating, mark import valid */
 300         if (active) {
 301                 CDEBUG(D_HA, "setting import %s VALID\n",
 302                        imp->imp_target_uuid.uuid);
 303                 spin_lock_irqsave(&imp->imp_lock, flags);
 304                 imp->imp_invalid = 0;
 305                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 306         }
 307
 308         if (obd->obd_observer)
 309                 RETURN(obd_notify(obd->obd_observer, obd, active));
 310
 311         RETURN(0);
 312 }
 313
 314 void ptlrpc_fail_import(struct obd_import *imp, int generation)
 315 {
 316         unsigned long flags;
 317         int in_recovery = 0;
 318         ENTRY;
 319
 320         LASSERT (!imp->imp_dlm_fake);
 321
 322         spin_lock_irqsave(&imp->imp_lock, flags);
 323         if (imp->imp_state != LUSTRE_IMP_FULL) {
 324                 in_recovery = 1;
 325         } else {
 326                 CDEBUG(D_HA, "%s: new state: DISCON\n",
 327                        imp->imp_client->cli_name);
 328                 imp->imp_state = LUSTRE_IMP_DISCON;
 329         }
 330         spin_unlock_irqrestore(&imp->imp_lock, flags);
 331
 332         if (in_recovery) {
 333                 EXIT;
 334                 return;
 335         }
 336
 337         ptlrpc_handle_failed_import(imp);
 338         EXIT;
 339 }
 340
 341 static int signal_completed_replay(struct obd_import *imp)
 342 {
 343         struct ptlrpc_request *req;
 344         int rc;
 345         ENTRY;
 346
 347         req = ptlrpc_prep_req(imp, OBD_PING, 0, NULL, NULL);
 348         if (!req)
 349                 RETURN(-ENOMEM);
 350
 351         req->rq_replen = lustre_msg_size(0, NULL);
 352         req->rq_send_state = LUSTRE_IMP_REPLAY;
 353         req->rq_reqmsg->flags |= MSG_LAST_REPLAY;
 354         req->rq_timeout *= 3;
 355
 356         rc = ptlrpc_queue_wait(req);
 357
 358         ptlrpc_req_finished(req);
 359         RETURN(rc);
 360 }
 361
 362 int ptlrpc_recover_import(struct obd_import *imp, char *new_uuid)
 363 {
 364         int rc;
 365         ENTRY;
 366
 367         rc = ptlrpc_recover_import_no_retry(imp, new_uuid);
 368
 369         if (rc && rc != -EALREADY) {
 370                 unsigned long flags;
 371                 CDEBUG(D_HA, "recovery of %s on %s failed (%d); restarting\n",
 372                        imp->imp_target_uuid.uuid,
 373                        new_uuid ? new_uuid :
 374                        (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
 375                 spin_lock_irqsave(&imp->imp_lock, flags);
 376                 imp->imp_state = LUSTRE_IMP_FULL;
 377                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 378                 ptlrpc_fail_import(imp, imp->imp_generation);
 379         }
 380         RETURN(rc);
 381 }
 382
 383 static int ptlrpc_recover_import_no_retry(struct obd_import *imp,
 384                                           char *new_uuid)
 385 {
 386         int rc;
 387         unsigned long flags;
 388         int in_recovery = 0;
 389         int was_invalid = 0;
 390         ENTRY;
 391
 392         spin_lock_irqsave(&imp->imp_lock, flags);
 393         if (imp->imp_state == LUSTRE_IMP_FULL) {
 394                 CDEBUG(D_HA, "%s: new state: DISCON\n",
 395                        imp->imp_client->cli_name);
 396                 imp->imp_state = LUSTRE_IMP_DISCON;
 397         }
 398
 399         if (imp->imp_state != LUSTRE_IMP_DISCON) {
 400                 in_recovery = 1;
 401         } else if (imp->imp_invalid) {
 402                 imp->imp_invalid = 0;
 403                 was_invalid = 1;
 404         }
 405
 406         spin_unlock_irqrestore(&imp->imp_lock, flags);
 407
 408         if (in_recovery == 1)
 409                 RETURN(-EALREADY);
 410
 411         down(&imp->imp_recovery_sem);
 412         /* If recovery happened while we waited, we're done. */
 413         if (imp->imp_state == LUSTRE_IMP_FULL)
 414                 GOTO(out, rc = 0);
 415
 416         LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 417
 418         if (new_uuid) {
 419                 struct ptlrpc_connection *conn;
 420                 struct obd_uuid uuid;
 421                 struct ptlrpc_peer peer;
 422                 struct obd_export *dlmexp;
 423
 424                 obd_str2uuid(&uuid, new_uuid);
 425                 if (ptlrpc_uuid_to_peer(&uuid, &peer)) {
 426                         CERROR("no connection found for UUID %s\n", new_uuid);
 427                         GOTO(out, rc = -EINVAL);
 428                 }
 429
 430                 conn = ptlrpc_get_connection(&peer, &uuid);
 431                 if (!conn)
 432                         GOTO(out, rc = -ENOMEM);
 433
 434                 CDEBUG(D_HA, "switching import %s/%s from %s to %s\n",
 435                        imp->imp_target_uuid.uuid, imp->imp_obd->obd_name,
 436                        imp->imp_connection->c_remote_uuid.uuid,
 437                        conn->c_remote_uuid.uuid);
 438
 439                 /* Switch the import's connection and the DLM export's
 440                  * connection (which are almost certainly the same, but we
 441                  * keep distinct refs just to make things clearer. I think. */
 442                 if (imp->imp_connection)
 443                         ptlrpc_put_connection(imp->imp_connection);
 444                 /* We hand off the ref from ptlrpc_get_connection. */
 445                 imp->imp_connection = conn;
 446
 447                 dlmexp = class_conn2export(&imp->imp_dlm_handle);
 448                 if (dlmexp->exp_connection)
 449                         ptlrpc_put_connection(dlmexp->exp_connection);
 450                 dlmexp->exp_connection = ptlrpc_connection_addref(conn);
 451                 class_export_put(dlmexp);
 452
 453         }
 454
 455  connect:
 456         rc = ptlrpc_connect_import(imp);
 457
 458         if (rc < 0) {
 459                 CERROR("failed to reconnect to %s@%s: %d\n",
 460                        imp->imp_target_uuid.uuid,
 461                        imp->imp_connection->c_remote_uuid.uuid, rc);
 462                 GOTO(out, rc);
 463         }
 464
 465         if (imp->imp_state == LUSTRE_IMP_EVICTED) {
 466                 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
 467                        imp->imp_target_uuid.uuid,
 468                        imp->imp_connection->c_remote_uuid.uuid);
 469                 ptlrpc_set_import_active(imp, 0);
 470                 CDEBUG(D_HA, "%s: new state: RECOVER\n",
 471                        imp->imp_client->cli_name);
 472                 imp->imp_state = LUSTRE_IMP_RECOVER;
 473         }
 474
 475         if (imp->imp_state == LUSTRE_IMP_REPLAY) {
 476                 CDEBUG(D_HA, "replay requested by %s\n",
 477                        imp->imp_target_uuid.uuid);
 478                 rc = ptlrpc_replay(imp);
 479                 if (rc)
 480                         GOTO(out, rc);
 481
 482                 rc = ldlm_replay_locks(imp);
 483                 if (rc)
 484                         GOTO(out, rc);
 485
 486                 rc = signal_completed_replay(imp);
 487                 if (rc)
 488                         GOTO(out, rc);
 489                 CDEBUG(D_HA, "%s: new state: RECOVER\n",
 490                        imp->imp_client->cli_name);
 491                 imp->imp_state = LUSTRE_IMP_RECOVER;
 492         }
 493
 494         if (imp->imp_state == LUSTRE_IMP_RECOVER) {
 495                 CDEBUG(D_HA, "reconnected to %s@%s\n",
 496                        imp->imp_target_uuid.uuid,
 497                        imp->imp_connection->c_remote_uuid.uuid);
 498
 499                 ptlrpc_set_import_active(imp, 1);
 500                 ptlrpc_resend(imp);
 501                 spin_lock_irqsave(&imp->imp_lock, flags);
 502                 CDEBUG(D_HA, "%s: new state: FULL\n",
 503                        imp->imp_client->cli_name);
 504                 imp->imp_state = LUSTRE_IMP_FULL;
 505                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 506                 ptlrpc_wake_delayed(imp);
 507         }
 508
 509
 510         LASSERT(imp->imp_state == LUSTRE_IMP_FULL);
 511
 512  out:
 513         if (rc != 0) {
 514                 spin_lock_irqsave(&imp->imp_lock, flags);
 515                 imp->imp_state = LUSTRE_IMP_DISCON;
 516                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 517
 518                 if (rc == -ENOTCONN) {
 519                         CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
 520                                "invalidating and reconnecting\n",
 521                                imp->imp_target_uuid.uuid,
 522                                imp->imp_connection->c_remote_uuid.uuid);
 523                         GOTO(connect, -ENOTCONN);
 524                 } else if (was_invalid) {
 525                         ptlrpc_set_import_active(imp, 0);
 526                 }
 527         }
 528         up(&imp->imp_recovery_sem);
 529         RETURN(rc);
 530 }
 531
 532 void ptlrpc_fail_export(struct obd_export *exp)
 533 {
 534         int rc, already_failed;
 535         unsigned long flags;
 536
 537         spin_lock_irqsave(&exp->exp_lock, flags);
 538         already_failed = exp->exp_failed;
 539         exp->exp_failed = 1;
 540         spin_unlock_irqrestore(&exp->exp_lock, flags);
 541
 542         if (already_failed) {
 543                 CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n",
 544                        exp, exp->exp_client_uuid.uuid);
 545                 return;
 546         }
 547
 548         CDEBUG(D_HA, "disconnecting export %p/%s\n",
 549                exp, exp->exp_client_uuid.uuid);
 550
 551         /* Most callers into obd_disconnect are removing their own reference
 552          * (request, for example) in addition to the one from the hash table.
 553          * We don't have such a reference here, so make one. */
 554         class_export_get(exp);
 555         rc = obd_disconnect(exp, 0);
 556         if (rc)
 557                 CERROR("disconnecting export %p failed: %d\n", exp, rc);
 558 }