lustre/ptlrpc/import.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2002, 2003 Cluster File Systems, Inc.
   5  *   Author: Mike Shaver <shaver@clusterfs.com>
   6  *
   7  *   This file is part of Lustre, http://www.lustre.org.
   8  *
   9  *   Lustre is free software; you can redistribute it and/or
  10  *   modify it under the terms of version 2 of the GNU General Public
  11  *   License as published by the Free Software Foundation.
  12  *
  13  *   Lustre is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with Lustre; if not, write to the Free Software
  20  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #define DEBUG_SUBSYSTEM S_RPC
  24 #ifdef __KERNEL__
  25 # include <linux/config.h>
  26 # include <linux/module.h>
  27 # include <linux/kmod.h>
  28 #else
  29 # include <liblustre.h>
  30 #endif
  31
  32 #include <linux/obd_support.h>
  33 #include <linux/lustre_ha.h>
  34 #include <linux/lustre_net.h>
  35 #include <linux/lustre_import.h>
  36 #include <linux/lustre_export.h>
  37 #include <linux/obd.h>
  38 #include <linux/obd_class.h>
  39
  40 #include "ptlrpc_internal.h"
  41
  42 struct ptlrpc_connect_async_args {
  43          __u64 pcaa_peer_committed;
  44         int pcaa_initial_connect;
  45         int pcaa_was_invalid;
  46 };
  47
  48 /* A CLOSED import should remain so. */
  49 #define IMPORT_SET_STATE_NOLOCK(imp, state)                                    \
  50 do {                                                                           \
  51         if (imp->imp_state != LUSTRE_IMP_CLOSED) {                             \
  52                CDEBUG(D_HA, "%p %s: changing import state from %s to %s\n",    \
  53                       imp, imp->imp_target_uuid.uuid,                          \
  54                       ptlrpc_import_state_name(imp->imp_state),                \
  55                       ptlrpc_import_state_name(state));                        \
  56                imp->imp_state = state;                                         \
  57         }                                                                      \
  58 } while(0)
  59
  60 #define IMPORT_SET_STATE(imp, state)                    \
  61 do {                                                    \
  62         unsigned long flags;                            \
  63                                                         \
  64         spin_lock_irqsave(&imp->imp_lock, flags);       \
  65         IMPORT_SET_STATE_NOLOCK(imp, state);            \
  66         spin_unlock_irqrestore(&imp->imp_lock, flags);  \
  67 } while(0)
  68
  69
  70 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
  71                                     void * data, int rc);
  72 int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
  73
  74 /* Only this function is allowed to change the import state when it is
  75  * CLOSED. I would rather refcount the import and free it after
  76  * disconnection like we do with exports. To do that, the client_obd
  77  * will need to save the peer info somewhere other than in the import,
  78  * though. */
  79 int ptlrpc_init_import(struct obd_import *imp)
  80 {
  81         unsigned long flags;
  82
  83         spin_lock_irqsave(&imp->imp_lock, flags);
  84
  85         imp->imp_generation++;
  86         imp->imp_state =  LUSTRE_IMP_NEW;
  87
  88         spin_unlock_irqrestore(&imp->imp_lock, flags);
  89
  90         return 0;
  91 }
  92
  93 /* Returns true if import was FULL, false if import was already not
  94  * connected.
  95  */
  96 int ptlrpc_set_import_discon(struct obd_import *imp)
  97 {
  98         unsigned long flags;
  99         int rc = 0;
 100
 101         spin_lock_irqsave(&imp->imp_lock, flags);
 102
 103         if (imp->imp_state == LUSTRE_IMP_FULL) {
 104                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
 105                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 106                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
 107                 rc = 1;
 108         } else {
 109                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 110                 CDEBUG(D_HA, "%p %s: import already not connected: %s\n",
 111                        imp,imp->imp_client->cli_name,
 112                        ptlrpc_import_state_name(imp->imp_state));
 113         }
 114
 115         return rc;
 116 }
 117
 118 void ptlrpc_invalidate_import(struct obd_import *imp)
 119 {
 120         struct obd_device *obd = imp->imp_obd;
 121         unsigned long flags;
 122         ENTRY;
 123
 124         spin_lock_irqsave(&imp->imp_lock, flags);
 125         /* This is a bit of a hack, but invalidating replayable
 126          * imports makes a temporary reconnect failure into a much more
 127          * ugly -- and hard to remedy -- situation. */
 128         if (!imp->imp_replayable) {
 129                 CDEBUG(D_HA, "setting import %s INVALID\n",
 130                        imp->imp_target_uuid.uuid);
 131                 imp->imp_invalid = 1;
 132         }
 133         imp->imp_generation++;
 134         spin_unlock_irqrestore(&imp->imp_lock, flags);
 135
 136         ptlrpc_abort_inflight(imp);
 137         obd_import_event(obd, imp, IMP_EVENT_INVALIDATE);
 138 }
 139
 140 void ptlrpc_validate_import(struct obd_import *imp)
 141 {
 142         struct obd_device *obd = imp->imp_obd;
 143         unsigned long flags;
 144
 145         spin_lock_irqsave(&imp->imp_lock, flags);
 146         imp->imp_invalid = 0;
 147         spin_unlock_irqrestore(&imp->imp_lock, flags);
 148
 149         obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
 150 }
 151
 152 void ptlrpc_fail_import(struct obd_import *imp, int generation)
 153 {
 154         ENTRY;
 155
 156         LASSERT (!imp->imp_dlm_fake);
 157
 158         if (ptlrpc_set_import_discon(imp)) {
 159                 unsigned long flags;
 160
 161                 if (!imp->imp_replayable) {
 162                         CDEBUG(D_HA, "import %s@%s for %s not replayable, "
 163                                "auto-deactivating\n",
 164                                imp->imp_target_uuid.uuid,
 165                                imp->imp_connection->c_remote_uuid.uuid,
 166                                imp->imp_obd->obd_name);
 167                         ptlrpc_invalidate_import(imp);
 168                 }
 169
 170                 CDEBUG(D_HA, "%s: waking up pinger\n",
 171                        imp->imp_target_uuid.uuid);
 172
 173                 spin_lock_irqsave(&imp->imp_lock, flags);
 174                 imp->imp_force_verify = 1;
 175                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 176
 177                 ptlrpc_pinger_wake_up();
 178
 179         }
 180         EXIT;
 181 }
 182
 183 int ptlrpc_connect_import(struct obd_import *imp, char * new_uuid)
 184 {
 185         struct obd_device *obd = imp->imp_obd;
 186         int initial_connect = 0;
 187         int rc;
 188         __u64 committed_before_reconnect = 0;
 189         int was_invalid = 0;
 190         struct ptlrpc_request *request;
 191         int size[] = {sizeof(imp->imp_target_uuid),
 192                                  sizeof(obd->obd_uuid),
 193                                  sizeof(imp->imp_dlm_handle)};
 194         char *tmp[] = {imp->imp_target_uuid.uuid,
 195                        obd->obd_uuid.uuid,
 196                        (char *)&imp->imp_dlm_handle};
 197         struct ptlrpc_connect_async_args *aa;
 198         unsigned long flags;
 199
 200         spin_lock_irqsave(&imp->imp_lock, flags);
 201         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 202                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 203                 CERROR("can't connect to a closed import\n");
 204                 RETURN(-EINVAL);
 205         } else if (imp->imp_state == LUSTRE_IMP_FULL) {
 206                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 207                 CERROR("already connected\n");
 208                 RETURN(0);
 209         } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
 210                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 211                 CERROR("already connecting\n");
 212                 RETURN(-EALREADY);
 213         }
 214
 215         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
 216
 217         imp->imp_conn_cnt++;
 218         imp->imp_last_replay_transno = 0;
 219
 220         if (imp->imp_remote_handle.cookie == 0) {
 221                 initial_connect = 1;
 222         } else {
 223                 committed_before_reconnect = imp->imp_peer_committed_transno;;
 224
 225         }
 226
 227         if (imp->imp_invalid) {
 228                 imp->imp_invalid = 0;
 229                 was_invalid = 1;
 230         }
 231
 232         spin_unlock_irqrestore(&imp->imp_lock, flags);
 233
 234         if (new_uuid) {
 235                 struct ptlrpc_connection *conn;
 236                 struct obd_uuid uuid;
 237                 struct obd_export *dlmexp;
 238
 239                 obd_str2uuid(&uuid, new_uuid);
 240
 241                 conn = ptlrpc_uuid_to_connection(&uuid);
 242                 if (!conn)
 243                         GOTO(out, rc = -ENOENT);
 244
 245                 CDEBUG(D_HA, "switching import %s/%s from %s to %s\n",
 246                        imp->imp_target_uuid.uuid, imp->imp_obd->obd_name,
 247                        imp->imp_connection->c_remote_uuid.uuid,
 248                        conn->c_remote_uuid.uuid);
 249
 250                 /* Switch the import's connection and the DLM export's
 251                  * connection (which are almost certainly the same, but we
 252                  * keep distinct refs just to make things clearer. I think. */
 253                 if (imp->imp_connection)
 254                         ptlrpc_put_connection(imp->imp_connection);
 255                 /* We hand off the ref from ptlrpc_get_connection. */
 256                 imp->imp_connection = conn;
 257
 258                 dlmexp = class_conn2export(&imp->imp_dlm_handle);
 259
 260                 LASSERT(dlmexp != NULL);
 261
 262                 if (dlmexp->exp_connection)
 263                         ptlrpc_put_connection(dlmexp->exp_connection);
 264                 dlmexp->exp_connection = ptlrpc_connection_addref(conn);
 265                 class_export_put(dlmexp);
 266
 267         }
 268
 269         request = ptlrpc_prep_req(imp, imp->imp_connect_op, 3, size, tmp);
 270         if (!request)
 271                 GOTO(out, rc = -ENOMEM);
 272
 273 #ifndef __KERNEL__
 274         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_LIBCLIENT);
 275 #endif
 276
 277         request->rq_send_state = LUSTRE_IMP_CONNECTING;
 278         request->rq_replen = lustre_msg_size(0, NULL);
 279         request->rq_interpret_reply = ptlrpc_connect_interpret;
 280
 281         LASSERT (sizeof (*aa) <= sizeof (request->rq_async_args));
 282         aa = (struct ptlrpc_connect_async_args *)&request->rq_async_args;
 283         memset(aa, 0, sizeof *aa);
 284
 285         aa->pcaa_peer_committed = committed_before_reconnect;
 286         aa->pcaa_initial_connect = initial_connect;
 287         aa->pcaa_was_invalid = was_invalid;
 288
 289         if (aa->pcaa_initial_connect)
 290                 imp->imp_replayable = 1;
 291
 292         ptlrpcd_add_req(request);
 293         rc = 0;
 294 out:
 295         if (rc != 0) {
 296                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 297         }
 298
 299         RETURN(rc);
 300 }
 301
 302 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
 303                                     void * data, int rc)
 304 {
 305         struct ptlrpc_connect_async_args *aa = data;
 306         struct obd_import *imp = request->rq_import;
 307         struct lustre_handle old_hdl;
 308         unsigned long flags;
 309         int msg_flags;
 310         ENTRY;
 311
 312         spin_lock_irqsave(&imp->imp_lock, flags);
 313         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 314                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 315                 RETURN(0);
 316         }
 317         spin_unlock_irqrestore(&imp->imp_lock, flags);
 318
 319         if (rc)
 320                 GOTO(out, rc);
 321
 322         msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
 323
 324         if (aa->pcaa_initial_connect) {
 325                 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
 326                         CDEBUG(D_HA, "connected to replayable target: %s\n",
 327                                imp->imp_target_uuid.uuid);
 328                         imp->imp_pingable = imp->imp_replayable = 1;
 329                 } else {
 330                         imp->imp_replayable = 0;
 331                 }
 332                 imp->imp_remote_handle = request->rq_repmsg->handle;
 333                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 334                 GOTO(finish, rc = 0);
 335         }
 336
 337         /* Determine what recovery state to move the import to. */
 338         if (MSG_CONNECT_RECONNECT & msg_flags) {
 339                 memset(&old_hdl, 0, sizeof(old_hdl));
 340                 if (!memcmp(&old_hdl, &request->rq_repmsg->handle,
 341                             sizeof (old_hdl))) {
 342                         CERROR("%s@%s didn't like our handle "LPX64
 343                                ", failed\n", imp->imp_target_uuid.uuid,
 344                                imp->imp_connection->c_remote_uuid.uuid,
 345                                imp->imp_dlm_handle.cookie);
 346                         GOTO(out, rc = -ENOTCONN);
 347                 }
 348
 349                 if (memcmp(&imp->imp_remote_handle, &request->rq_repmsg->handle,
 350                            sizeof(imp->imp_remote_handle))) {
 351                         CERROR("%s@%s changed handle from "LPX64" to "LPX64
 352                                "; copying, but this may foreshadow disaster\n",
 353                                imp->imp_target_uuid.uuid,
 354                                imp->imp_connection->c_remote_uuid.uuid,
 355                                imp->imp_remote_handle.cookie,
 356                                request->rq_repmsg->handle.cookie);
 357                         imp->imp_remote_handle = request->rq_repmsg->handle;
 358                 } else {
 359                         CERROR("reconnected to %s@%s after partition\n",
 360                                imp->imp_target_uuid.uuid,
 361                                imp->imp_connection->c_remote_uuid.uuid);
 362                 }
 363                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 364         }
 365         else if (MSG_CONNECT_RECOVERING & msg_flags) {
 366                 LASSERT(imp->imp_replayable);
 367                 imp->imp_state = LUSTRE_IMP_RECOVER;
 368                 imp->imp_remote_handle = request->rq_repmsg->handle;
 369                 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 370         }
 371         else {
 372                 imp->imp_remote_handle = request->rq_repmsg->handle;
 373                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 374         }
 375
 376         /* Sanity checks for a reconnected import. */
 377         if (!(imp->imp_replayable) !=
 378              !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
 379                 CERROR("imp_replayable flag does not match server "
 380                        "after reconnect. We should LBUG right here.\n");
 381         }
 382
 383         if (request->rq_repmsg->last_committed < aa->pcaa_peer_committed) {
 384                 CERROR("%s went back in time (transno "LPD64
 385                        " was previously committed, server now claims "LPD64
 386                        ")! is shared storage not coherent?\n",
 387                        imp->imp_target_uuid.uuid,
 388                        aa->pcaa_peer_committed,
 389                        request->rq_repmsg->last_committed);
 390         }
 391
 392 finish:
 393         rc = ptlrpc_import_recovery_state_machine(imp);
 394         if (rc != 0) {
 395                 if (aa->pcaa_was_invalid)
 396                         ptlrpc_invalidate_import(imp);
 397
 398                 if (rc == -ENOTCONN) {
 399                         CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
 400                                "invalidating and reconnecting\n",
 401                                imp->imp_target_uuid.uuid,
 402                                imp->imp_connection->c_remote_uuid.uuid);
 403                         ptlrpc_connect_import(imp, NULL);
 404                         RETURN(0);
 405                 }
 406         }
 407  out:
 408         if (rc != 0) {
 409                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 410                 if (aa->pcaa_initial_connect && !imp->imp_initial_recov) {
 411                         ptlrpc_invalidate_import(imp);
 412                 }
 413                 CDEBUG(D_ERROR, "recovery of %s on %s failed (%d)\n",
 414                        imp->imp_target_uuid.uuid,
 415                        (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
 416         }
 417
 418         wake_up(&imp->imp_recovery_waitq);
 419         RETURN(rc);
 420 }
 421
 422 static int completed_replay_interpret(struct ptlrpc_request *req,
 423                                     void * data, int rc)
 424 {
 425         atomic_dec(&req->rq_import->imp_replay_inflight);
 426         ptlrpc_import_recovery_state_machine(req->rq_import);
 427         RETURN(0);
 428 }
 429
 430 static int signal_completed_replay(struct obd_import *imp)
 431  {
 432         struct ptlrpc_request *req;
 433         ENTRY;
 434
 435         LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
 436         atomic_inc(&imp->imp_replay_inflight);
 437
 438         req = ptlrpc_prep_req(imp, OBD_PING, 0, NULL, NULL);
 439         if (!req)
 440                 RETURN(-ENOMEM);
 441
 442         req->rq_replen = lustre_msg_size(0, NULL);
 443         req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
 444         req->rq_reqmsg->flags |= MSG_LAST_REPLAY;
 445         req->rq_timeout *= 3;
 446         req->rq_interpret_reply = completed_replay_interpret;
 447
 448         ptlrpcd_add_req(req);
 449         RETURN(0);
 450 }
 451
 452
 453 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
 454 {
 455         int rc = 0;
 456         int inflight;
 457
 458         if (imp->imp_state == LUSTRE_IMP_EVICTED) {
 459                 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
 460                        imp->imp_target_uuid.uuid,
 461                        imp->imp_connection->c_remote_uuid.uuid);
 462                 ptlrpc_invalidate_import(imp);
 463                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 464         }
 465
 466         if (imp->imp_state == LUSTRE_IMP_REPLAY) {
 467                 CDEBUG(D_HA, "replay requested by %s\n",
 468                        imp->imp_target_uuid.uuid);
 469                 rc = ptlrpc_replay_next(imp, &inflight);
 470                 if (inflight == 0 &&
 471                     atomic_read(&imp->imp_replay_inflight) == 0) {
 472                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
 473                         rc = ldlm_replay_locks(imp);
 474                         if (rc)
 475                                 GOTO(out, rc);
 476                 }
 477                 rc = 0;
 478         }
 479
 480         if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
 481                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
 482                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
 483                         rc = signal_completed_replay(imp);
 484                         if (rc)
 485                                 GOTO(out, rc);
 486                 }
 487
 488         }
 489
 490         if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
 491                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
 492                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 493                 }
 494         }
 495
 496         if (imp->imp_state == LUSTRE_IMP_RECOVER) {
 497                 CDEBUG(D_HA, "reconnected to %s@%s\n",
 498                        imp->imp_target_uuid.uuid,
 499                        imp->imp_connection->c_remote_uuid.uuid);
 500
 501                 rc = ptlrpc_resend(imp);
 502                 if (rc)
 503                         GOTO(out, rc);
 504                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 505                 ptlrpc_validate_import(imp);
 506         }
 507
 508         if (imp->imp_state == LUSTRE_IMP_FULL) {
 509                 wake_up(&imp->imp_recovery_waitq);
 510                 ptlrpc_wake_delayed(imp);
 511         }
 512
 513  out:
 514         RETURN(rc);
 515 }
 516
 517 static int back_to_sleep(void *unused)
 518 {
 519         return 0;
 520 }
 521
 522 int ptlrpc_disconnect_import(struct obd_import *imp)
 523 {
 524         struct ptlrpc_request *request;
 525         int rq_opc;
 526         int rc = 0;
 527         unsigned long flags;
 528         ENTRY;
 529
 530         switch (imp->imp_connect_op) {
 531         case OST_CONNECT: rq_opc = OST_DISCONNECT; break;
 532         case MDS_CONNECT: rq_opc = MDS_DISCONNECT; break;
 533         case MGMT_CONNECT:rq_opc = MGMT_DISCONNECT;break;
 534         default:
 535                 CERROR("don't know how to disconnect from %s (connect_op %d)\n",
 536                        imp->imp_target_uuid.uuid, imp->imp_connect_op);
 537                 RETURN(-EINVAL);
 538         }
 539
 540
 541         if (ptlrpc_import_in_recovery(imp)) {
 542                 struct l_wait_info lwi;
 543                 lwi = LWI_TIMEOUT_INTR(MAX(obd_timeout * HZ, 1), back_to_sleep,
 544                                        NULL, NULL);
 545                 rc = l_wait_event(imp->imp_recovery_waitq,
 546                                   !ptlrpc_import_in_recovery(imp), &lwi);
 547
 548         }
 549
 550         spin_lock_irqsave(&imp->imp_lock, flags);
 551         if (imp->imp_state != LUSTRE_IMP_FULL) {
 552                 GOTO(out, 0);
 553         }
 554         spin_unlock_irqrestore(&imp->imp_lock, flags);
 555
 556         request = ptlrpc_prep_req(imp, rq_opc, 0, NULL, NULL);
 557         if (request) {
 558                 /* For non-replayable connections, don't attempt
 559                    reconnect if this fails */
 560                 if (!imp->imp_replayable) {
 561                         request->rq_no_resend = 1;
 562                         IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
 563                         request->rq_send_state =  LUSTRE_IMP_CONNECTING;
 564                 }
 565                 request->rq_replen = lustre_msg_size(0, NULL);
 566                 rc = ptlrpc_queue_wait(request);
 567                 ptlrpc_req_finished(request);
 568         }
 569
 570         spin_lock_irqsave(&imp->imp_lock, flags);
 571 out:
 572         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
 573         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
 574         spin_unlock_irqrestore(&imp->imp_lock, flags);
 575
 576         RETURN(rc);
 577 }
 578