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 };
  46
  47 /* A CLOSED import should remain so. */
  48 #define IMPORT_SET_STATE_NOLOCK(imp, state)                                    \
  49 do {                                                                           \
  50         if (imp->imp_state != LUSTRE_IMP_CLOSED) {                             \
  51                CDEBUG(D_HA, "%p %s: changing import state from %s to %s\n",    \
  52                       imp, imp->imp_target_uuid.uuid,                          \
  53                       ptlrpc_import_state_name(imp->imp_state),                \
  54                       ptlrpc_import_state_name(state));                        \
  55                imp->imp_state = state;                                         \
  56         }                                                                      \
  57 } while(0)
  58
  59 #define IMPORT_SET_STATE(imp, state)                    \
  60 do {                                                    \
  61         unsigned long flags;                            \
  62                                                         \
  63         spin_lock_irqsave(&imp->imp_lock, flags);       \
  64         IMPORT_SET_STATE_NOLOCK(imp, state);            \
  65         spin_unlock_irqrestore(&imp->imp_lock, flags);  \
  66 } while(0)
  67
  68
  69 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
  70                                     void * data, int rc);
  71 int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
  72
  73 /* Only this function is allowed to change the import state when it is
  74  * CLOSED. I would rather refcount the import and free it after
  75  * disconnection like we do with exports. To do that, the client_obd
  76  * will need to save the peer info somewhere other than in the import,
  77  * though. */
  78 int ptlrpc_init_import(struct obd_import *imp)
  79 {
  80         unsigned long flags;
  81
  82         spin_lock_irqsave(&imp->imp_lock, flags);
  83
  84         imp->imp_generation++;
  85         imp->imp_state =  LUSTRE_IMP_NEW;
  86
  87         spin_unlock_irqrestore(&imp->imp_lock, flags);
  88
  89         return 0;
  90 }
  91
  92 #define UUID_STR "_UUID"
  93 static void deuuidify(char *uuid, const char *prefix, char **uuid_start, int *uuid_len)
  94 {
  95         *uuid_start = !prefix || strncmp(uuid, prefix, strlen(prefix))
  96                 ? uuid : uuid + strlen(prefix);
  97
  98         *uuid_len = strlen(*uuid_start);
  99
 100         if (*uuid_len < strlen(UUID_STR))
 101                 return;
 102
 103         if (!strncmp(*uuid_start + *uuid_len - strlen(UUID_STR),
 104                     UUID_STR, strlen(UUID_STR)))
 105                 *uuid_len -= strlen(UUID_STR);
 106 }
 107
 108 /* Returns true if import was FULL, false if import was already not
 109  * connected.
 110  */
 111 int ptlrpc_set_import_discon(struct obd_import *imp)
 112 {
 113         unsigned long flags;
 114         int rc = 0;
 115
 116         spin_lock_irqsave(&imp->imp_lock, flags);
 117
 118         if (imp->imp_state == LUSTRE_IMP_FULL) {
 119                 char nidbuf[PTL_NALFMT_SIZE];
 120                 char *target_start;
 121                 int   target_len;
 122
 123                 deuuidify(imp->imp_target_uuid.uuid, NULL,
 124                           &target_start, &target_len);
 125
 126                 LCONSOLE_ERROR("Connection to service %.*s via nid %s was "
 127                                "lost; in progress operations using this "
 128                                "service will %s.\n",
 129                                target_len, target_start,
 130                                ptlrpc_peernid2str(&imp->imp_connection->c_peer,
 131                                                   nidbuf),
 132                                imp->imp_replayable
 133                                ? "wait for recovery to complete"
 134                                : "fail");
 135
 136                 CWARN("%s: connection lost to %s@%s\n",
 137                       imp->imp_obd->obd_name,
 138                       imp->imp_target_uuid.uuid,
 139                       imp->imp_connection->c_remote_uuid.uuid);
 140                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
 141                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 142                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
 143                 rc = 1;
 144         } else {
 145                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 146                 CDEBUG(D_HA, "%p %s: import already not connected: %s\n",
 147                        imp,imp->imp_client->cli_name,
 148                        ptlrpc_import_state_name(imp->imp_state));
 149         }
 150
 151         return rc;
 152 }
 153
 154 /*
 155  * This acts as a barrier; all existing requests are rejected, and
 156  * no new requests will be accepted until the import is valid again.
 157  */
 158 void ptlrpc_deactivate_import(struct obd_import *imp)
 159 {
 160         unsigned long flags;
 161         ENTRY;
 162
 163         spin_lock_irqsave(&imp->imp_lock, flags);
 164         CDEBUG(D_HA, "setting import %s INVALID\n", imp->imp_target_uuid.uuid);
 165         imp->imp_invalid = 1;
 166         imp->imp_generation++;
 167         spin_unlock_irqrestore(&imp->imp_lock, flags);
 168
 169         ptlrpc_abort_inflight(imp);
 170         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
 171 }
 172
 173 /*
 174  * This function will invalidate the import, if necessary, then block
 175  * for all the RPC completions, and finally notify the obd to
 176  * invalidate its state (ie cancel locks, clear pending requests,
 177  * etc).
 178  */
 179 void ptlrpc_invalidate_import(struct obd_import *imp)
 180 {
 181         struct l_wait_info lwi;
 182         int rc;
 183
 184         if (!imp->imp_invalid)
 185                 ptlrpc_deactivate_import(imp);
 186
 187         LASSERT(imp->imp_invalid);
 188
 189         /* wait for all requests to error out and call completion callbacks */
 190         lwi = LWI_TIMEOUT_INTR(MAX(obd_timeout * HZ, 1), NULL,
 191                                NULL, NULL);
 192         rc = l_wait_event(imp->imp_recovery_waitq,
 193                           (atomic_read(&imp->imp_inflight) == 0),
 194                           &lwi);
 195
 196         if (rc)
 197                 CERROR("%s: rc = %d waiting for callback (%d != 0)\n",
 198                        imp->imp_target_uuid.uuid, rc,
 199                        atomic_read(&imp->imp_inflight));
 200
 201         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
 202 }
 203
 204 void ptlrpc_activate_import(struct obd_import *imp)
 205 {
 206         struct obd_device *obd = imp->imp_obd;
 207         unsigned long flags;
 208
 209         spin_lock_irqsave(&imp->imp_lock, flags);
 210         imp->imp_invalid = 0;
 211         spin_unlock_irqrestore(&imp->imp_lock, flags);
 212
 213         obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
 214 }
 215
 216 void ptlrpc_fail_import(struct obd_import *imp, int generation)
 217 {
 218         ENTRY;
 219
 220         LASSERT (!imp->imp_dlm_fake);
 221
 222         if (ptlrpc_set_import_discon(imp)) {
 223                 unsigned long flags;
 224
 225                 if (!imp->imp_replayable) {
 226                         CDEBUG(D_HA, "import %s@%s for %s not replayable, "
 227                                "auto-deactivating\n",
 228                                imp->imp_target_uuid.uuid,
 229                                imp->imp_connection->c_remote_uuid.uuid,
 230                                imp->imp_obd->obd_name);
 231                         ptlrpc_deactivate_import(imp);
 232                 }
 233
 234                 CDEBUG(D_HA, "%s: waking up pinger\n",
 235                        imp->imp_target_uuid.uuid);
 236
 237                 spin_lock_irqsave(&imp->imp_lock, flags);
 238                 imp->imp_force_verify = 1;
 239                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 240
 241                 ptlrpc_pinger_wake_up();
 242         }
 243         EXIT;
 244 }
 245
 246 static int import_select_connection(struct obd_import *imp)
 247 {
 248         struct obd_import_conn *imp_conn;
 249         struct obd_export *dlmexp;
 250         ENTRY;
 251
 252         spin_lock(&imp->imp_lock);
 253
 254         if (list_empty(&imp->imp_conn_list)) {
 255                 CERROR("%s: no connections available\n",
 256                         imp->imp_obd->obd_name);
 257                 spin_unlock(&imp->imp_lock);
 258                 RETURN(-EINVAL);
 259         }
 260
 261         if (imp->imp_conn_current &&
 262             !(imp->imp_conn_current->oic_item.next == &imp->imp_conn_list)) {
 263                 imp_conn = list_entry(imp->imp_conn_current->oic_item.next,
 264                                   struct obd_import_conn, oic_item);
 265         } else {
 266                 imp_conn = list_entry(imp->imp_conn_list.next,
 267                                       struct obd_import_conn, oic_item);
 268         }
 269
 270         /* switch connection, don't mind if it's same as the current one */
 271         if (imp->imp_connection)
 272                 ptlrpc_put_connection(imp->imp_connection);
 273         imp->imp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 274
 275         dlmexp =  class_conn2export(&imp->imp_dlm_handle);
 276         LASSERT(dlmexp != NULL);
 277         if (dlmexp->exp_connection)
 278                 ptlrpc_put_connection(dlmexp->exp_connection);
 279         dlmexp->exp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 280         class_export_put(dlmexp);
 281
 282         imp->imp_conn_current = imp_conn;
 283         CDEBUG(D_HA, "%s: import %p using connection %s\n",
 284                imp->imp_obd->obd_name, imp, imp_conn->oic_uuid.uuid);
 285         spin_unlock(&imp->imp_lock);
 286
 287         RETURN(0);
 288 }
 289
 290 int ptlrpc_connect_import(struct obd_import *imp, char * new_uuid)
 291 {
 292         struct obd_device *obd = imp->imp_obd;
 293         int initial_connect = 0;
 294         int rc;
 295         __u64 committed_before_reconnect = 0;
 296         struct ptlrpc_request *request;
 297         int size[] = {sizeof(imp->imp_target_uuid),
 298                       sizeof(obd->obd_uuid),
 299                       sizeof(imp->imp_dlm_handle),
 300                       sizeof(imp->imp_connect_data)};
 301         char *tmp[] = {imp->imp_target_uuid.uuid,
 302                        obd->obd_uuid.uuid,
 303                        (char *)&imp->imp_dlm_handle,
 304                        (char *)&imp->imp_connect_data};
 305         struct ptlrpc_connect_async_args *aa;
 306         unsigned long flags;
 307
 308         spin_lock_irqsave(&imp->imp_lock, flags);
 309         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 310                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 311                 CERROR("can't connect to a closed import\n");
 312                 RETURN(-EINVAL);
 313         } else if (imp->imp_state == LUSTRE_IMP_FULL) {
 314                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 315                 CERROR("already connected\n");
 316                 RETURN(0);
 317         } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
 318                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 319                 CERROR("already connecting\n");
 320                 RETURN(-EALREADY);
 321         }
 322
 323         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
 324
 325         imp->imp_conn_cnt++;
 326         imp->imp_resend_replay = 0;
 327
 328         if (imp->imp_remote_handle.cookie == 0) {
 329                 initial_connect = 1;
 330         } else {
 331                 committed_before_reconnect = imp->imp_peer_committed_transno;
 332         }
 333
 334         spin_unlock_irqrestore(&imp->imp_lock, flags);
 335
 336         if (new_uuid) {
 337                 struct obd_uuid uuid;
 338
 339                 obd_str2uuid(&uuid, new_uuid);
 340                 rc = import_set_conn_priority(imp, &uuid);
 341                 if (rc)
 342                         GOTO(out, rc);
 343         }
 344
 345         rc = import_select_connection(imp);
 346         if (rc)
 347                 GOTO(out, rc);
 348
 349         request = ptlrpc_prep_req(imp, imp->imp_connect_op, 4, size, tmp);
 350         if (!request)
 351                 GOTO(out, rc = -ENOMEM);
 352
 353 #ifndef __KERNEL__
 354         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_LIBCLIENT);
 355 #endif
 356
 357         request->rq_send_state = LUSTRE_IMP_CONNECTING;
 358         size[0] = sizeof(struct obd_connect_data);
 359         request->rq_replen = lustre_msg_size(1, size);
 360         request->rq_interpret_reply = ptlrpc_connect_interpret;
 361
 362         LASSERT (sizeof (*aa) <= sizeof (request->rq_async_args));
 363         aa = (struct ptlrpc_connect_async_args *)&request->rq_async_args;
 364         memset(aa, 0, sizeof *aa);
 365
 366         aa->pcaa_peer_committed = committed_before_reconnect;
 367         aa->pcaa_initial_connect = initial_connect;
 368
 369         if (aa->pcaa_initial_connect)
 370                 imp->imp_replayable = 1;
 371
 372         DEBUG_REQ(D_RPCTRACE, request, "(re)connect request");
 373         ptlrpcd_add_req(request);
 374         rc = 0;
 375 out:
 376         if (rc != 0) {
 377                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 378         }
 379
 380         RETURN(rc);
 381 }
 382
 383 static void ptlrpc_maybe_ping_import_soon(struct obd_import *imp)
 384 {
 385         struct obd_import_conn *imp_conn;
 386         unsigned long flags;
 387         int wake_pinger = 0;
 388
 389         ENTRY;
 390
 391         spin_lock_irqsave(&imp->imp_lock, flags);
 392         if (list_empty(&imp->imp_conn_list))
 393                 GOTO(unlock, 0);
 394
 395         imp_conn = list_entry(imp->imp_conn_list.prev,
 396                               struct obd_import_conn,
 397                               oic_item);
 398
 399         if (imp->imp_conn_current != imp_conn) {
 400                 ptlrpc_ping_import_soon(imp);
 401                 wake_pinger = 1;
 402         }
 403
 404  unlock:
 405         spin_unlock_irqrestore(&imp->imp_lock, flags);
 406
 407         if (wake_pinger)
 408                 ptlrpc_pinger_wake_up();
 409
 410         EXIT;
 411 }
 412
 413 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
 414                                     void * data, int rc)
 415 {
 416         struct ptlrpc_connect_async_args *aa = data;
 417         struct obd_import *imp = request->rq_import;
 418         struct lustre_handle old_hdl;
 419         unsigned long flags;
 420         int msg_flags;
 421         ENTRY;
 422
 423         spin_lock_irqsave(&imp->imp_lock, flags);
 424         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 425                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 426                 RETURN(0);
 427         }
 428         spin_unlock_irqrestore(&imp->imp_lock, flags);
 429
 430         if (rc)
 431                 GOTO(out, rc);
 432
 433         LASSERT(imp->imp_conn_current);
 434
 435         msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
 436
 437         /* All imports are pingable */
 438         imp->imp_pingable = 1;
 439
 440         if (aa->pcaa_initial_connect) {
 441                 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
 442                         CDEBUG(D_HA, "connected to replayable target: %s\n",
 443                                imp->imp_target_uuid.uuid);
 444                         imp->imp_replayable = 1;
 445                 } else {
 446                         imp->imp_replayable = 0;
 447                 }
 448                 imp->imp_remote_handle = request->rq_repmsg->handle;
 449
 450                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 451                 GOTO(finish, rc = 0);
 452         }
 453
 454         /* Determine what recovery state to move the import to. */
 455         if (MSG_CONNECT_RECONNECT & msg_flags) {
 456                 memset(&old_hdl, 0, sizeof(old_hdl));
 457                 if (!memcmp(&old_hdl, &request->rq_repmsg->handle,
 458                             sizeof (old_hdl))) {
 459                         CERROR("%s@%s didn't like our handle "LPX64
 460                                ", failed\n", imp->imp_target_uuid.uuid,
 461                                imp->imp_connection->c_remote_uuid.uuid,
 462                                imp->imp_dlm_handle.cookie);
 463                         GOTO(out, rc = -ENOTCONN);
 464                 }
 465
 466                 if (memcmp(&imp->imp_remote_handle, &request->rq_repmsg->handle,
 467                            sizeof(imp->imp_remote_handle))) {
 468                         CERROR("%s@%s changed handle from "LPX64" to "LPX64
 469                                "; copying, but this may foreshadow disaster\n",
 470                                imp->imp_target_uuid.uuid,
 471                                imp->imp_connection->c_remote_uuid.uuid,
 472                                imp->imp_remote_handle.cookie,
 473                                request->rq_repmsg->handle.cookie);
 474                         imp->imp_remote_handle = request->rq_repmsg->handle;
 475                 } else {
 476                         CDEBUG(D_HA, "reconnected to %s@%s after partition\n",
 477                                imp->imp_target_uuid.uuid,
 478                                imp->imp_connection->c_remote_uuid.uuid);
 479                 }
 480
 481                 if (imp->imp_invalid) {
 482                         IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 483                 } else if (MSG_CONNECT_RECOVERING & msg_flags) {
 484                         CDEBUG(D_HA, "%s: reconnected to %s during replay\n",
 485                                imp->imp_obd->obd_name,
 486                                imp->imp_target_uuid.uuid);
 487                         imp->imp_resend_replay = 1;
 488                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 489                 } else {
 490                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 491                 }
 492         } else if ((MSG_CONNECT_RECOVERING & msg_flags) && !imp->imp_invalid) {
 493                 LASSERT(imp->imp_replayable);
 494                 imp->imp_remote_handle = request->rq_repmsg->handle;
 495                 imp->imp_last_replay_transno = 0;
 496                 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 497         } else {
 498                 imp->imp_remote_handle = request->rq_repmsg->handle;
 499                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 500         }
 501
 502         /* Sanity checks for a reconnected import. */
 503         if (!(imp->imp_replayable) != !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
 504                 CERROR("imp_replayable flag does not match server "
 505                        "after reconnect. We should LBUG right here.\n");
 506         }
 507
 508         if (request->rq_repmsg->last_committed < aa->pcaa_peer_committed) {
 509                 CERROR("%s went back in time (transno "LPD64
 510                        " was previously committed, server now claims "LPD64
 511                        ")! is shared storage not coherent?\n",
 512                        imp->imp_target_uuid.uuid,
 513                        aa->pcaa_peer_committed,
 514                        request->rq_repmsg->last_committed);
 515         }
 516
 517 finish:
 518         rc = ptlrpc_import_recovery_state_machine(imp);
 519         if (rc != 0) {
 520                 if (rc == -ENOTCONN) {
 521                         CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
 522                                "invalidating and reconnecting\n",
 523                                imp->imp_target_uuid.uuid,
 524                                imp->imp_connection->c_remote_uuid.uuid);
 525                         ptlrpc_connect_import(imp, NULL);
 526                         RETURN(0);
 527                 }
 528         } else {
 529                 list_del(&imp->imp_conn_current->oic_item);
 530                 list_add(&imp->imp_conn_current->oic_item,
 531                          &imp->imp_conn_list);
 532                 imp->imp_conn_current = NULL;
 533         }
 534
 535  out:
 536         if (rc != 0) {
 537                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 538                 if (aa->pcaa_initial_connect && !imp->imp_initial_recov) {
 539                         ptlrpc_deactivate_import(imp);
 540                 }
 541
 542                 ptlrpc_maybe_ping_import_soon(imp);
 543
 544                 CDEBUG(D_HA, "recovery of %s on %s failed (%d)\n",
 545                        imp->imp_target_uuid.uuid,
 546                        (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
 547         }
 548
 549         wake_up(&imp->imp_recovery_waitq);
 550         RETURN(rc);
 551 }
 552
 553 static int completed_replay_interpret(struct ptlrpc_request *req,
 554                                     void * data, int rc)
 555 {
 556         atomic_dec(&req->rq_import->imp_replay_inflight);
 557         if (req->rq_status == 0) {
 558                 ptlrpc_import_recovery_state_machine(req->rq_import);
 559         } else {
 560                 CDEBUG(D_HA, "%s: LAST_REPLAY message error: %d, "
 561                        "reconnecting\n",
 562                        req->rq_import->imp_obd->obd_name, req->rq_status);
 563                 ptlrpc_connect_import(req->rq_import, NULL);
 564         }
 565
 566         RETURN(0);
 567 }
 568
 569 static int signal_completed_replay(struct obd_import *imp)
 570 {
 571         struct ptlrpc_request *req;
 572         ENTRY;
 573
 574         LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
 575         atomic_inc(&imp->imp_replay_inflight);
 576
 577         req = ptlrpc_prep_req(imp, OBD_PING, 0, NULL, NULL);
 578         if (!req) {
 579                 atomic_dec(&imp->imp_replay_inflight);
 580                 RETURN(-ENOMEM);
 581         }
 582
 583         req->rq_replen = lustre_msg_size(0, NULL);
 584         req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
 585         req->rq_reqmsg->flags |= MSG_LAST_REPLAY;
 586         req->rq_timeout *= 3;
 587         req->rq_interpret_reply = completed_replay_interpret;
 588
 589         ptlrpcd_add_req(req);
 590         RETURN(0);
 591 }
 592
 593 #ifdef __KERNEL__
 594 static int ptlrpc_invalidate_import_thread(void *data)
 595 {
 596         struct obd_import *imp = data;
 597         unsigned long flags;
 598
 599         ENTRY;
 600
 601         lock_kernel();
 602         ptlrpc_daemonize();
 603
 604         SIGNAL_MASK_LOCK(current, flags);
 605         sigfillset(&current->blocked);
 606         RECALC_SIGPENDING;
 607         SIGNAL_MASK_UNLOCK(current, flags);
 608         THREAD_NAME(current->comm, sizeof(current->comm), "ll_imp_inval");
 609         unlock_kernel();
 610
 611         CDEBUG(D_HA, "thread invalidate import %s to %s@%s\n",
 612                imp->imp_obd->obd_name, imp->imp_target_uuid.uuid,
 613                imp->imp_connection->c_remote_uuid.uuid);
 614
 615         ptlrpc_invalidate_import(imp);
 616
 617         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 618         ptlrpc_import_recovery_state_machine(imp);
 619
 620         RETURN(0);
 621 }
 622 #endif
 623
 624 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
 625 {
 626         int rc = 0;
 627         int inflight;
 628         char *target_start;
 629         int target_len;
 630
 631         if (imp->imp_state == LUSTRE_IMP_EVICTED) {
 632                 deuuidify(imp->imp_target_uuid.uuid, NULL,
 633                           &target_start, &target_len);
 634                 LCONSOLE_ERROR("This client was evicted by %.*s; in progress "
 635                                "operations using this service will fail.\n",
 636                                target_len, target_start);
 637                 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
 638                        imp->imp_target_uuid.uuid,
 639                        imp->imp_connection->c_remote_uuid.uuid);
 640
 641 #ifdef __KERNEL__
 642                 rc = kernel_thread(ptlrpc_invalidate_import_thread, imp,
 643                                    CLONE_VM | CLONE_FILES);
 644                 if (rc < 0)
 645                         CERROR("error starting invalidate thread: %d\n", rc);
 646                 else
 647                         rc = 0;
 648                 RETURN(rc);
 649 #else
 650                 ptlrpc_invalidate_import(imp);
 651
 652                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 653 #endif
 654         }
 655
 656         if (imp->imp_state == LUSTRE_IMP_REPLAY) {
 657                 CDEBUG(D_HA, "replay requested by %s\n",
 658                        imp->imp_target_uuid.uuid);
 659                 rc = ptlrpc_replay_next(imp, &inflight);
 660                 if (inflight == 0 &&
 661                     atomic_read(&imp->imp_replay_inflight) == 0) {
 662                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
 663                         rc = ldlm_replay_locks(imp);
 664                         if (rc)
 665                                 GOTO(out, rc);
 666                 }
 667                 rc = 0;
 668         }
 669
 670         if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
 671                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
 672                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
 673                         rc = signal_completed_replay(imp);
 674                         if (rc)
 675                                 GOTO(out, rc);
 676                 }
 677
 678         }
 679
 680         if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
 681                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
 682                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 683                 }
 684         }
 685
 686         if (imp->imp_state == LUSTRE_IMP_RECOVER) {
 687                 char nidbuf[PTL_NALFMT_SIZE];
 688
 689                 CDEBUG(D_HA, "reconnected to %s@%s\n",
 690                        imp->imp_target_uuid.uuid,
 691                        imp->imp_connection->c_remote_uuid.uuid);
 692
 693                 rc = ptlrpc_resend(imp);
 694                 if (rc)
 695                         GOTO(out, rc);
 696                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 697                 ptlrpc_activate_import(imp);
 698
 699                 deuuidify(imp->imp_target_uuid.uuid, NULL,
 700                           &target_start, &target_len);
 701                 ptlrpc_peernid2str(&imp->imp_connection->c_peer,
 702                                    nidbuf);
 703
 704                 LCONSOLE_INFO("Connection restored to service %.*s using nid "
 705                               "%s.\n",
 706                               target_len, target_start, nidbuf);
 707
 708                 CWARN("%s: connection restored to %s@%s\n",
 709                       imp->imp_obd->obd_name,
 710                       imp->imp_target_uuid.uuid,
 711                       imp->imp_connection->c_remote_uuid.uuid);
 712         }
 713
 714         if (imp->imp_state == LUSTRE_IMP_FULL) {
 715                 wake_up(&imp->imp_recovery_waitq);
 716                 ptlrpc_wake_delayed(imp);
 717         }
 718
 719  out:
 720         RETURN(rc);
 721 }
 722
 723 static int back_to_sleep(void *unused)
 724 {
 725         return 0;
 726 }
 727
 728 int ptlrpc_disconnect_import(struct obd_import *imp)
 729 {
 730         struct ptlrpc_request *request;
 731         int rq_opc;
 732         int rc = 0;
 733         unsigned long flags;
 734         ENTRY;
 735
 736         switch (imp->imp_connect_op) {
 737         case OST_CONNECT: rq_opc = OST_DISCONNECT; break;
 738         case MDS_CONNECT: rq_opc = MDS_DISCONNECT; break;
 739         case MGMT_CONNECT:rq_opc = MGMT_DISCONNECT;break;
 740         default:
 741                 CERROR("don't know how to disconnect from %s (connect_op %d)\n",
 742                        imp->imp_target_uuid.uuid, imp->imp_connect_op);
 743                 RETURN(-EINVAL);
 744         }
 745
 746
 747         if (ptlrpc_import_in_recovery(imp)) {
 748                 struct l_wait_info lwi;
 749                 lwi = LWI_TIMEOUT_INTR(MAX(obd_timeout * HZ, 1), back_to_sleep,
 750                                        NULL, NULL);
 751                 rc = l_wait_event(imp->imp_recovery_waitq,
 752                                   !ptlrpc_import_in_recovery(imp), &lwi);
 753
 754         }
 755
 756         spin_lock_irqsave(&imp->imp_lock, flags);
 757         if (imp->imp_state != LUSTRE_IMP_FULL) {
 758                 GOTO(out, 0);
 759         }
 760         spin_unlock_irqrestore(&imp->imp_lock, flags);
 761
 762         request = ptlrpc_prep_req(imp, rq_opc, 0, NULL, NULL);
 763         if (request) {
 764                 /* For non-replayable connections, don't attempt
 765                    reconnect if this fails */
 766                 if (!imp->imp_replayable) {
 767                         request->rq_no_resend = 1;
 768                         IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
 769                         request->rq_send_state =  LUSTRE_IMP_CONNECTING;
 770                 }
 771                 request->rq_replen = lustre_msg_size(0, NULL);
 772                 rc = ptlrpc_queue_wait(request);
 773                 ptlrpc_req_finished(request);
 774         }
 775
 776         spin_lock_irqsave(&imp->imp_lock, flags);
 777 out:
 778         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
 779         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
 780         spin_unlock_irqrestore(&imp->imp_lock, flags);
 781
 782         RETURN(rc);
 783 }
 784