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 /* Returns true if import was FULL, false if import was already not
  93  * connected.
  94  */
  95 int ptlrpc_set_import_discon(struct obd_import *imp)
  96 {
  97         unsigned long flags;
  98         int rc = 0;
  99
 100         spin_lock_irqsave(&imp->imp_lock, flags);
 101
 102         if (imp->imp_state == LUSTRE_IMP_FULL) {
 103                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
 104                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 105                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
 106                 rc = 1;
 107         } else {
 108                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 109                 CDEBUG(D_HA, "%p %s: import already not connected: %s\n",
 110                        imp,imp->imp_client->cli_name,
 111                        ptlrpc_import_state_name(imp->imp_state));
 112         }
 113
 114         return rc;
 115 }
 116
 117 /*
 118  * This acts as a barrier; all existing requests are rejected, and
 119  * no new requests will be accepted until the import is valid again.
 120  */
 121 void ptlrpc_deactivate_import(struct obd_import *imp)
 122 {
 123         unsigned long flags;
 124         ENTRY;
 125
 126         spin_lock_irqsave(&imp->imp_lock, flags);
 127         CDEBUG(D_HA, "setting import %s INVALID\n",
 128                imp->imp_target_uuid.uuid);
 129         imp->imp_invalid = 1;
 130         imp->imp_generation++;
 131         spin_unlock_irqrestore(&imp->imp_lock, flags);
 132
 133         ptlrpc_abort_inflight(imp);
 134         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
 135 }
 136
 137 /*
 138  * This function will invalidate the import, if necessary, then block
 139  * for all the RPC completions, and finally notify the obd to
 140  * invalidate its state (ie cancel locks, clear pending requests,
 141  * etc).
 142  *
 143  * in_rpc: true if this is called while processing an rpc, like
 144  *    CONNECT. It will allow for one RPC to be inflight while
 145  *    waiting for requests to complete. Ugly, yes, but I don't see an
 146  *    cleaner way right now.
 147  */
 148 void ptlrpc_invalidate_import(struct obd_import *imp, int in_rpc)
 149 {
 150         struct l_wait_info lwi;
 151         int inflight = 0;
 152         int rc;
 153
 154         if (!imp->imp_invalid)
 155                 ptlrpc_deactivate_import(imp);
 156
 157         LASSERT(imp->imp_invalid);
 158
 159         if (in_rpc)
 160                 inflight = 1;
 161         /* wait for all requests to error out and call completion
 162            callbacks */
 163         lwi = LWI_TIMEOUT_INTR(MAX(obd_timeout * HZ, 1), NULL,
 164                                NULL, NULL);
 165         rc = l_wait_event(imp->imp_recovery_waitq,
 166                           (atomic_read(&imp->imp_inflight) == inflight),
 167                           &lwi);
 168
 169         if (rc)
 170                 CERROR("%s: rc = %d waiting for callback (%d != %d)\n",
 171                        imp->imp_target_uuid.uuid, rc,
 172                        atomic_read(&imp->imp_inflight), inflight);
 173
 174         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
 175 }
 176
 177 static void ptlrpc_activate_import(struct obd_import *imp)
 178 {
 179         struct obd_device *obd = imp->imp_obd;
 180         unsigned long flags;
 181
 182         spin_lock_irqsave(&imp->imp_lock, flags);
 183         imp->imp_invalid = 0;
 184         spin_unlock_irqrestore(&imp->imp_lock, flags);
 185
 186         obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
 187 }
 188
 189 void ptlrpc_fail_import(struct obd_import *imp, int generation)
 190 {
 191         ENTRY;
 192
 193         LASSERT (!imp->imp_dlm_fake);
 194
 195         if (ptlrpc_set_import_discon(imp)) {
 196                 unsigned long flags;
 197
 198                 if (!imp->imp_replayable) {
 199                         CDEBUG(D_HA, "import %s@%s for %s not replayable, "
 200                                "auto-deactivating\n",
 201                                imp->imp_target_uuid.uuid,
 202                                imp->imp_connection->c_remote_uuid.uuid,
 203                                imp->imp_obd->obd_name);
 204                         ptlrpc_deactivate_import(imp);
 205                 }
 206
 207                 CDEBUG(D_HA, "%s: waking up pinger\n",
 208                        imp->imp_target_uuid.uuid);
 209
 210                 spin_lock_irqsave(&imp->imp_lock, flags);
 211                 imp->imp_force_verify = 1;
 212                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 213
 214                 ptlrpc_pinger_wake_up();
 215
 216         }
 217         EXIT;
 218 }
 219
 220 int ptlrpc_connect_import(struct obd_import *imp, char * new_uuid)
 221 {
 222         struct obd_device *obd = imp->imp_obd;
 223         int initial_connect = 0;
 224         int rc;
 225         __u64 committed_before_reconnect = 0;
 226         struct ptlrpc_request *request;
 227         int size[] = {sizeof(imp->imp_target_uuid),
 228                                  sizeof(obd->obd_uuid),
 229                                  sizeof(imp->imp_dlm_handle)};
 230         char *tmp[] = {imp->imp_target_uuid.uuid,
 231                        obd->obd_uuid.uuid,
 232                        (char *)&imp->imp_dlm_handle};
 233         struct ptlrpc_connect_async_args *aa;
 234         unsigned long flags;
 235
 236         spin_lock_irqsave(&imp->imp_lock, flags);
 237         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 238                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 239                 CERROR("can't connect to a closed import\n");
 240                 RETURN(-EINVAL);
 241         } else if (imp->imp_state == LUSTRE_IMP_FULL) {
 242                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 243                 CERROR("already connected\n");
 244                 RETURN(0);
 245         } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
 246                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 247                 CERROR("already connecting\n");
 248                 RETURN(-EALREADY);
 249         }
 250
 251         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
 252
 253         imp->imp_conn_cnt++;
 254         imp->imp_last_replay_transno = 0;
 255
 256         if (imp->imp_remote_handle.cookie == 0) {
 257                 initial_connect = 1;
 258         } else {
 259                 committed_before_reconnect = imp->imp_peer_committed_transno;;
 260
 261         }
 262
 263
 264         spin_unlock_irqrestore(&imp->imp_lock, flags);
 265
 266         if (new_uuid) {
 267                 struct ptlrpc_connection *conn;
 268                 struct obd_uuid uuid;
 269                 struct obd_export *dlmexp;
 270
 271                 obd_str2uuid(&uuid, new_uuid);
 272
 273                 conn = ptlrpc_uuid_to_connection(&uuid);
 274                 if (!conn)
 275                         GOTO(out, rc = -ENOENT);
 276
 277                 CDEBUG(D_HA, "switching import %s/%s from %s to %s\n",
 278                        imp->imp_target_uuid.uuid, imp->imp_obd->obd_name,
 279                        imp->imp_connection->c_remote_uuid.uuid,
 280                        conn->c_remote_uuid.uuid);
 281
 282                 /* Switch the import's connection and the DLM export's
 283                  * connection (which are almost certainly the same, but we
 284                  * keep distinct refs just to make things clearer. I think. */
 285                 if (imp->imp_connection)
 286                         ptlrpc_put_connection(imp->imp_connection);
 287                 /* We hand off the ref from ptlrpc_get_connection. */
 288                 imp->imp_connection = conn;
 289
 290                 dlmexp = class_conn2export(&imp->imp_dlm_handle);
 291
 292                 LASSERT(dlmexp != NULL);
 293
 294                 if (dlmexp->exp_connection)
 295                         ptlrpc_put_connection(dlmexp->exp_connection);
 296                 dlmexp->exp_connection = ptlrpc_connection_addref(conn);
 297                 class_export_put(dlmexp);
 298
 299         }
 300
 301         request = ptlrpc_prep_req(imp, imp->imp_connect_op, 3, size, tmp);
 302         if (!request)
 303                 GOTO(out, rc = -ENOMEM);
 304
 305 #ifndef __KERNEL__
 306         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_LIBCLIENT);
 307 #endif
 308
 309         request->rq_send_state = LUSTRE_IMP_CONNECTING;
 310         request->rq_replen = lustre_msg_size(0, NULL);
 311         request->rq_interpret_reply = ptlrpc_connect_interpret;
 312
 313         LASSERT (sizeof (*aa) <= sizeof (request->rq_async_args));
 314         aa = (struct ptlrpc_connect_async_args *)&request->rq_async_args;
 315         memset(aa, 0, sizeof *aa);
 316
 317         aa->pcaa_peer_committed = committed_before_reconnect;
 318         aa->pcaa_initial_connect = initial_connect;
 319
 320         if (aa->pcaa_initial_connect)
 321                 imp->imp_replayable = 1;
 322
 323         ptlrpcd_add_req(request);
 324         rc = 0;
 325 out:
 326         if (rc != 0) {
 327                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 328         }
 329
 330         RETURN(rc);
 331 }
 332
 333 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
 334                                     void * data, int rc)
 335 {
 336         struct ptlrpc_connect_async_args *aa = data;
 337         struct obd_import *imp = request->rq_import;
 338         struct lustre_handle old_hdl;
 339         unsigned long flags;
 340         int msg_flags;
 341         ENTRY;
 342
 343         spin_lock_irqsave(&imp->imp_lock, flags);
 344         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 345                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 346                 RETURN(0);
 347         }
 348         spin_unlock_irqrestore(&imp->imp_lock, flags);
 349
 350         if (rc)
 351                 GOTO(out, rc);
 352
 353         msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
 354
 355         if (aa->pcaa_initial_connect) {
 356                 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
 357                         CDEBUG(D_HA, "connected to replayable target: %s\n",
 358                                imp->imp_target_uuid.uuid);
 359                         imp->imp_pingable = imp->imp_replayable = 1;
 360                 } else {
 361                         imp->imp_replayable = 0;
 362                 }
 363                 imp->imp_remote_handle = request->rq_repmsg->handle;
 364                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 365                 GOTO(finish, rc = 0);
 366         }
 367
 368         /* Determine what recovery state to move the import to. */
 369         if (MSG_CONNECT_RECONNECT & msg_flags) {
 370                 memset(&old_hdl, 0, sizeof(old_hdl));
 371                 if (!memcmp(&old_hdl, &request->rq_repmsg->handle,
 372                             sizeof (old_hdl))) {
 373                         CERROR("%s@%s didn't like our handle "LPX64
 374                                ", failed\n", imp->imp_target_uuid.uuid,
 375                                imp->imp_connection->c_remote_uuid.uuid,
 376                                imp->imp_dlm_handle.cookie);
 377                         GOTO(out, rc = -ENOTCONN);
 378                 }
 379
 380                 if (memcmp(&imp->imp_remote_handle, &request->rq_repmsg->handle,
 381                            sizeof(imp->imp_remote_handle))) {
 382                         CERROR("%s@%s changed handle from "LPX64" to "LPX64
 383                                "; copying, but this may foreshadow disaster\n",
 384                                imp->imp_target_uuid.uuid,
 385                                imp->imp_connection->c_remote_uuid.uuid,
 386                                imp->imp_remote_handle.cookie,
 387                                request->rq_repmsg->handle.cookie);
 388                         imp->imp_remote_handle = request->rq_repmsg->handle;
 389                 } else {
 390                         CERROR("reconnected to %s@%s after partition\n",
 391                                imp->imp_target_uuid.uuid,
 392                                imp->imp_connection->c_remote_uuid.uuid);
 393                 }
 394
 395                 if (imp->imp_invalid)
 396                         IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 397                 else
 398                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 399         }
 400         else if ((MSG_CONNECT_RECOVERING & msg_flags) && !imp->imp_invalid) {
 401                 LASSERT(imp->imp_replayable);
 402                 imp->imp_remote_handle = request->rq_repmsg->handle;
 403                 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 404         }
 405         else {
 406                 imp->imp_remote_handle = request->rq_repmsg->handle;
 407                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 408         }
 409
 410         /* Sanity checks for a reconnected import. */
 411         if (!(imp->imp_replayable) !=
 412              !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
 413                 CERROR("imp_replayable flag does not match server "
 414                        "after reconnect. We should LBUG right here.\n");
 415         }
 416
 417         if (request->rq_repmsg->last_committed < aa->pcaa_peer_committed) {
 418                 CERROR("%s went back in time (transno "LPD64
 419                        " was previously committed, server now claims "LPD64
 420                        ")! is shared storage not coherent?\n",
 421                        imp->imp_target_uuid.uuid,
 422                        aa->pcaa_peer_committed,
 423                        request->rq_repmsg->last_committed);
 424         }
 425
 426 finish:
 427         rc = ptlrpc_import_recovery_state_machine(imp);
 428         if (rc != 0) {
 429                 if (rc == -ENOTCONN) {
 430                         CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
 431                                "invalidating and reconnecting\n",
 432                                imp->imp_target_uuid.uuid,
 433                                imp->imp_connection->c_remote_uuid.uuid);
 434                         ptlrpc_connect_import(imp, NULL);
 435                         RETURN(0);
 436                 }
 437         }
 438  out:
 439         if (rc != 0) {
 440                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 441                 if (aa->pcaa_initial_connect && !imp->imp_initial_recov) {
 442                         ptlrpc_deactivate_import(imp);
 443                 }
 444                 CDEBUG(D_ERROR, "recovery of %s on %s failed (%d)\n",
 445                        imp->imp_target_uuid.uuid,
 446                        (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
 447         }
 448
 449         wake_up(&imp->imp_recovery_waitq);
 450         RETURN(rc);
 451 }
 452
 453 static int completed_replay_interpret(struct ptlrpc_request *req,
 454                                     void * data, int rc)
 455 {
 456         atomic_dec(&req->rq_import->imp_replay_inflight);
 457         ptlrpc_import_recovery_state_machine(req->rq_import);
 458         RETURN(0);
 459 }
 460
 461 static int signal_completed_replay(struct obd_import *imp)
 462  {
 463         struct ptlrpc_request *req;
 464         ENTRY;
 465
 466         LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
 467         atomic_inc(&imp->imp_replay_inflight);
 468
 469         req = ptlrpc_prep_req(imp, OBD_PING, 0, NULL, NULL);
 470         if (!req)
 471                 RETURN(-ENOMEM);
 472
 473         req->rq_replen = lustre_msg_size(0, NULL);
 474         req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
 475         req->rq_reqmsg->flags |= MSG_LAST_REPLAY;
 476         req->rq_timeout *= 3;
 477         req->rq_interpret_reply = completed_replay_interpret;
 478
 479         ptlrpcd_add_req(req);
 480         RETURN(0);
 481 }
 482
 483 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
 484 {
 485         int rc = 0;
 486         int inflight;
 487
 488         if (imp->imp_state == LUSTRE_IMP_EVICTED) {
 489                 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
 490                        imp->imp_target_uuid.uuid,
 491                        imp->imp_connection->c_remote_uuid.uuid);
 492
 493                 ptlrpc_invalidate_import(imp, 1);
 494
 495                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 496         }
 497
 498         if (imp->imp_state == LUSTRE_IMP_REPLAY) {
 499                 CDEBUG(D_HA, "replay requested by %s\n",
 500                        imp->imp_target_uuid.uuid);
 501                 rc = ptlrpc_replay_next(imp, &inflight);
 502                 if (inflight == 0 &&
 503                     atomic_read(&imp->imp_replay_inflight) == 0) {
 504                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
 505                         rc = ldlm_replay_locks(imp);
 506                         if (rc)
 507                                 GOTO(out, rc);
 508                 }
 509                 rc = 0;
 510         }
 511
 512         if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
 513                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
 514                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
 515                         rc = signal_completed_replay(imp);
 516                         if (rc)
 517                                 GOTO(out, rc);
 518                 }
 519
 520         }
 521
 522         if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
 523                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
 524                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 525                 }
 526         }
 527
 528         if (imp->imp_state == LUSTRE_IMP_RECOVER) {
 529                 CDEBUG(D_HA, "reconnected to %s@%s\n",
 530                        imp->imp_target_uuid.uuid,
 531                        imp->imp_connection->c_remote_uuid.uuid);
 532
 533                 rc = ptlrpc_resend(imp);
 534                 if (rc)
 535                         GOTO(out, rc);
 536                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 537                 ptlrpc_activate_import(imp);
 538         }
 539
 540         if (imp->imp_state == LUSTRE_IMP_FULL) {
 541                 wake_up(&imp->imp_recovery_waitq);
 542                 ptlrpc_wake_delayed(imp);
 543         }
 544
 545  out:
 546         RETURN(rc);
 547 }
 548
 549 static int back_to_sleep(void *unused)
 550 {
 551         return 0;
 552 }
 553
 554 int ptlrpc_disconnect_import(struct obd_import *imp)
 555 {
 556         struct ptlrpc_request *request;
 557         int rq_opc;
 558         int rc = 0;
 559         unsigned long flags;
 560         ENTRY;
 561
 562         switch (imp->imp_connect_op) {
 563         case OST_CONNECT: rq_opc = OST_DISCONNECT; break;
 564         case MDS_CONNECT: rq_opc = MDS_DISCONNECT; break;
 565         case MGMT_CONNECT:rq_opc = MGMT_DISCONNECT;break;
 566         default:
 567                 CERROR("don't know how to disconnect from %s (connect_op %d)\n",
 568                        imp->imp_target_uuid.uuid, imp->imp_connect_op);
 569                 RETURN(-EINVAL);
 570         }
 571
 572
 573         if (ptlrpc_import_in_recovery(imp)) {
 574                 struct l_wait_info lwi;
 575                 lwi = LWI_TIMEOUT_INTR(MAX(obd_timeout * HZ, 1), back_to_sleep,
 576                                        NULL, NULL);
 577                 rc = l_wait_event(imp->imp_recovery_waitq,
 578                                   !ptlrpc_import_in_recovery(imp), &lwi);
 579
 580         }
 581
 582         spin_lock_irqsave(&imp->imp_lock, flags);
 583         if (imp->imp_state != LUSTRE_IMP_FULL) {
 584                 GOTO(out, 0);
 585         }
 586         spin_unlock_irqrestore(&imp->imp_lock, flags);
 587
 588         request = ptlrpc_prep_req(imp, rq_opc, 0, NULL, NULL);
 589         if (request) {
 590                 /* For non-replayable connections, don't attempt
 591                    reconnect if this fails */
 592                 if (!imp->imp_replayable) {
 593                         request->rq_no_resend = 1;
 594                         IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
 595                         request->rq_send_state =  LUSTRE_IMP_CONNECTING;
 596                 }
 597                 request->rq_replen = lustre_msg_size(0, NULL);
 598                 rc = ptlrpc_queue_wait(request);
 599                 ptlrpc_req_finished(request);
 600         }
 601
 602         spin_lock_irqsave(&imp->imp_lock, flags);
 603 out:
 604         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
 605         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
 606         spin_unlock_irqrestore(&imp->imp_lock, flags);
 607
 608         RETURN(rc);
 609 }
 610