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 the Lustre file system, http://www.lustre.org
   8  *   Lustre is a trademark of Cluster File Systems, Inc.
   9  *
  10  *   You may have signed or agreed to another license before downloading
  11  *   this software.  If so, you are bound by the terms and conditions
  12  *   of that agreement, and the following does not apply to you.  See the
  13  *   LICENSE file included with this distribution for more information.
  14  *
  15  *   If you did not agree to a different license, then this copy of Lustre
  16  *   is open source software; you can redistribute it and/or modify it
  17  *   under the terms of version 2 of the GNU General Public License as
  18  *   published by the Free Software Foundation.
  19  *
  20  *   In either case, Lustre is distributed in the hope that it will be
  21  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  22  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *   license text for more details.
  24  */
  25
  26 #define DEBUG_SUBSYSTEM S_RPC
  27 #ifndef __KERNEL__
  28 # include <liblustre.h>
  29 #endif
  30
  31 #include <obd_support.h>
  32 #include <lustre_ha.h>
  33 #include <lustre_net.h>
  34 #include <lustre_import.h>
  35 #include <lustre_export.h>
  36 #include <obd.h>
  37 #include <obd_class.h>
  38
  39 #include "ptlrpc_internal.h"
  40
  41 struct ptlrpc_connect_async_args {
  42          __u64 pcaa_peer_committed;
  43         int pcaa_initial_connect;
  44 };
  45
  46 /* A CLOSED import should remain so. */
  47 #define IMPORT_SET_STATE_NOLOCK(imp, state)                                    \
  48 do {                                                                           \
  49         if (imp->imp_state != LUSTRE_IMP_CLOSED) {                             \
  50                CDEBUG(D_HA, "%p %s: changing import state from %s to %s\n",    \
  51                       imp, obd2cli_tgt(imp->imp_obd),                          \
  52                       ptlrpc_import_state_name(imp->imp_state),                \
  53                       ptlrpc_import_state_name(state));                        \
  54                imp->imp_state = state;                                         \
  55         }                                                                      \
  56 } while(0)
  57
  58 #define IMPORT_SET_STATE(imp, state)            \
  59 do {                                            \
  60         spin_lock(&imp->imp_lock);              \
  61         IMPORT_SET_STATE_NOLOCK(imp, state);    \
  62         spin_unlock(&imp->imp_lock);            \
  63 } while(0)
  64
  65
  66 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
  67                                     void * data, int rc);
  68 int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
  69
  70 /* Only this function is allowed to change the import state when it is
  71  * CLOSED. I would rather refcount the import and free it after
  72  * disconnection like we do with exports. To do that, the client_obd
  73  * will need to save the peer info somewhere other than in the import,
  74  * though. */
  75 int ptlrpc_init_import(struct obd_import *imp)
  76 {
  77         spin_lock(&imp->imp_lock);
  78
  79         imp->imp_generation++;
  80         imp->imp_state =  LUSTRE_IMP_NEW;
  81
  82         spin_unlock(&imp->imp_lock);
  83
  84         return 0;
  85 }
  86 EXPORT_SYMBOL(ptlrpc_init_import);
  87
  88 #define UUID_STR "_UUID"
  89 static void deuuidify(char *uuid, const char *prefix, char **uuid_start,
  90                       int *uuid_len)
  91 {
  92         *uuid_start = !prefix || strncmp(uuid, prefix, strlen(prefix))
  93                 ? uuid : uuid + strlen(prefix);
  94
  95         *uuid_len = strlen(*uuid_start);
  96
  97         if (*uuid_len < strlen(UUID_STR))
  98                 return;
  99
 100         if (!strncmp(*uuid_start + *uuid_len - strlen(UUID_STR),
 101                     UUID_STR, strlen(UUID_STR)))
 102                 *uuid_len -= strlen(UUID_STR);
 103 }
 104
 105 /* Returns true if import was FULL, false if import was already not
 106  * connected.
 107  * @imp - import to be disconnected
 108  * @conn_cnt - connection count (epoch) of the request that timed out
 109  *             and caused the disconnection.  In some cases, multiple
 110  *             inflight requests can fail to a single target (e.g. OST
 111  *             bulk requests) and if one has already caused a reconnection
 112  *             (increasing the import->conn_cnt) the older failure should
 113  *             not also cause a reconnection.  If zero it forces a reconnect.
 114  */
 115 int ptlrpc_set_import_discon(struct obd_import *imp, __u32 conn_cnt)
 116 {
 117         int rc = 0;
 118
 119         spin_lock(&imp->imp_lock);
 120
 121         if (imp->imp_state == LUSTRE_IMP_FULL &&
 122             (conn_cnt == 0 || conn_cnt == imp->imp_conn_cnt)) {
 123                 char *target_start;
 124                 int   target_len;
 125
 126                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
 127                           &target_start, &target_len);
 128
 129                 if (imp->imp_replayable) {
 130                         LCONSOLE_WARN("%s: Connection to service %.*s via nid "
 131                                "%s was lost; in progress operations using this "
 132                                "service will wait for recovery to complete.\n",
 133                                imp->imp_obd->obd_name, target_len, target_start,
 134                                libcfs_nid2str(imp->imp_connection->c_peer.nid));
 135                 } else {
 136                         LCONSOLE_ERROR_MSG(0x166, "%s: Connection to service "
 137                                            "%.*s via nid %s was lost; in progress"
 138                                            "operations using this service will"
 139                                            "fail.\n",
 140                                            imp->imp_obd->obd_name,
 141                                            target_len, target_start,
 142                                  libcfs_nid2str(imp->imp_connection->c_peer.nid));
 143                 }
 144                 ptlrpc_deactivate_timeouts(imp);
 145                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
 146                 spin_unlock(&imp->imp_lock);
 147
 148                 if (obd_dump_on_timeout)
 149                         libcfs_debug_dumplog();
 150
 151                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
 152                 rc = 1;
 153         } else {
 154                 spin_unlock(&imp->imp_lock);
 155                 CDEBUG(D_HA, "%s: import %p already %s (conn %u, was %u): %s\n",
 156                        imp->imp_client->cli_name, imp,
 157                        (imp->imp_state == LUSTRE_IMP_FULL &&
 158                         imp->imp_conn_cnt > conn_cnt) ?
 159                        "reconnected" : "not connected", imp->imp_conn_cnt,
 160                        conn_cnt, ptlrpc_import_state_name(imp->imp_state));
 161         }
 162
 163         return rc;
 164 }
 165
 166 /* Must be called with imp_lock held! */
 167 static void ptlrpc_deactivate_and_unlock_import(struct obd_import *imp)
 168 {
 169         ENTRY;
 170         LASSERT_SPIN_LOCKED(&imp->imp_lock);
 171
 172         if (imp->imp_invalid) {
 173                 spin_unlock(&imp->imp_lock);
 174                 EXIT;
 175                 return;
 176         }
 177
 178         CDEBUG(D_HA, "setting import %s INVALID\n", obd2cli_tgt(imp->imp_obd));
 179         imp->imp_invalid = 1;
 180         imp->imp_generation++;
 181         spin_unlock(&imp->imp_lock);
 182
 183         ptlrpc_abort_inflight(imp);
 184         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
 185
 186         EXIT;
 187 }
 188
 189 /*
 190  * This acts as a barrier; all existing requests are rejected, and
 191  * no new requests will be accepted until the import is valid again.
 192  */
 193 void ptlrpc_deactivate_import(struct obd_import *imp)
 194 {
 195         spin_lock(&imp->imp_lock);
 196         ptlrpc_deactivate_and_unlock_import(imp);
 197 }
 198
 199 /*
 200  * This function will invalidate the import, if necessary, then block
 201  * for all the RPC completions, and finally notify the obd to
 202  * invalidate its state (ie cancel locks, clear pending requests,
 203  * etc).
 204  */
 205 void ptlrpc_invalidate_import(struct obd_import *imp)
 206 {
 207         struct l_wait_info lwi;
 208         int rc;
 209
 210         atomic_inc(&imp->imp_inval_count);
 211
 212         ptlrpc_deactivate_import(imp);
 213
 214         LASSERT(imp->imp_invalid);
 215
 216         /* wait for all requests to error out and call completion callbacks */
 217         lwi = LWI_TIMEOUT_INTERVAL(cfs_timeout_cap(cfs_time_seconds(obd_timeout)),
 218                                    HZ, NULL, NULL);
 219         rc = l_wait_event(imp->imp_recovery_waitq,
 220                           (atomic_read(&imp->imp_inflight) == 0), &lwi);
 221
 222         if (rc)
 223                 CDEBUG(D_HA, "%s: rc = %d waiting for callback (%d != 0)\n",
 224                        obd2cli_tgt(imp->imp_obd), rc,
 225                        atomic_read(&imp->imp_inflight));
 226
 227         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
 228         sptlrpc_import_flush_all_ctx(imp);
 229
 230         atomic_dec(&imp->imp_inval_count);
 231         cfs_waitq_signal(&imp->imp_recovery_waitq);
 232 }
 233
 234 /* unset imp_invalid */
 235 void ptlrpc_activate_import(struct obd_import *imp)
 236 {
 237         struct obd_device *obd = imp->imp_obd;
 238
 239         spin_lock(&imp->imp_lock);
 240         imp->imp_invalid = 0;
 241         ptlrpc_activate_timeouts(imp);
 242         spin_unlock(&imp->imp_lock);
 243         obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
 244 }
 245
 246 void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt)
 247 {
 248         ENTRY;
 249
 250         LASSERT(!imp->imp_dlm_fake);
 251
 252         if (ptlrpc_set_import_discon(imp, conn_cnt)) {
 253                 if (!imp->imp_replayable) {
 254                         CDEBUG(D_HA, "import %s@%s for %s not replayable, "
 255                                "auto-deactivating\n",
 256                                obd2cli_tgt(imp->imp_obd),
 257                                imp->imp_connection->c_remote_uuid.uuid,
 258                                imp->imp_obd->obd_name);
 259                         ptlrpc_deactivate_import(imp);
 260                 }
 261
 262                 CDEBUG(D_HA, "%s: waking up pinger\n",
 263                        obd2cli_tgt(imp->imp_obd));
 264
 265                 spin_lock(&imp->imp_lock);
 266                 imp->imp_force_verify = 1;
 267                 spin_unlock(&imp->imp_lock);
 268
 269                 ptlrpc_pinger_wake_up();
 270         }
 271         EXIT;
 272 }
 273
 274 int ptlrpc_reconnect_import(struct obd_import *imp)
 275 {
 276
 277         ptlrpc_set_import_discon(imp, 0);
 278         /* Force a new connect attempt */
 279         ptlrpc_invalidate_import(imp);
 280         /* Do a fresh connect next time by zeroing the handle */
 281         ptlrpc_disconnect_import(imp, 1);
 282         /* Wait for all invalidate calls to finish */
 283         if (atomic_read(&imp->imp_inval_count) > 0) {
 284                 int rc;
 285                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
 286                 rc = l_wait_event(imp->imp_recovery_waitq,
 287                                   (atomic_read(&imp->imp_inval_count) == 0),
 288                                   &lwi);
 289                 if (rc)
 290                         CERROR("Interrupted, inval=%d\n",
 291                                atomic_read(&imp->imp_inval_count));
 292         }
 293
 294         /* Allow reconnect attempts */
 295         imp->imp_obd->obd_no_recov = 0;
 296         /* Remove 'invalid' flag */
 297         ptlrpc_activate_import(imp);
 298         /* Attempt a new connect */
 299         ptlrpc_recover_import(imp, NULL);
 300         return 0;
 301 }
 302
 303 EXPORT_SYMBOL(ptlrpc_reconnect_import);
 304
 305 static int import_select_connection(struct obd_import *imp)
 306 {
 307         struct obd_import_conn *imp_conn = NULL, *conn;
 308         struct obd_export *dlmexp;
 309         ENTRY;
 310
 311         spin_lock(&imp->imp_lock);
 312
 313         if (list_empty(&imp->imp_conn_list)) {
 314                 CERROR("%s: no connections available\n",
 315                         imp->imp_obd->obd_name);
 316                 spin_unlock(&imp->imp_lock);
 317                 RETURN(-EINVAL);
 318         }
 319
 320         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 321                 CDEBUG(D_HA, "%s: connect to NID %s last attempt "LPU64"\n",
 322                        imp->imp_obd->obd_name,
 323                        libcfs_nid2str(conn->oic_conn->c_peer.nid),
 324                        conn->oic_last_attempt);
 325                 /* Throttle the reconnect rate to once per RECONNECT_INTERVAL */
 326                 if (cfs_time_before_64(conn->oic_last_attempt +
 327                                        RECONNECT_INTERVAL * HZ,
 328                                        cfs_time_current_64())) {
 329                         /* If we have never tried this connection since the
 330                            the last successful attempt, go with this one */
 331                         if (cfs_time_beforeq_64(conn->oic_last_attempt,
 332                                                imp->imp_last_success_conn)) {
 333                                 imp_conn = conn;
 334                                 break;
 335                         }
 336
 337                         /* Both of these connections have already been tried
 338                            since the last successful connection; just choose the
 339                            least recently used */
 340                         if (!imp_conn)
 341                                 imp_conn = conn;
 342                         else if (cfs_time_before_64(conn->oic_last_attempt,
 343                                                     imp_conn->oic_last_attempt))
 344                                 imp_conn = conn;
 345                 }
 346         }
 347
 348         /* if not found, simply choose the current one */
 349         if (!imp_conn) {
 350                 LASSERT(imp->imp_conn_current);
 351                 imp_conn = imp->imp_conn_current;
 352         }
 353         LASSERT(imp_conn->oic_conn);
 354
 355         imp_conn->oic_last_attempt = cfs_time_current_64();
 356
 357         /* switch connection, don't mind if it's same as the current one */
 358         if (imp->imp_connection)
 359                 ptlrpc_put_connection(imp->imp_connection);
 360         imp->imp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 361
 362         dlmexp =  class_conn2export(&imp->imp_dlm_handle);
 363         LASSERT(dlmexp != NULL);
 364         if (dlmexp->exp_connection)
 365                 ptlrpc_put_connection(dlmexp->exp_connection);
 366         dlmexp->exp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 367         class_export_put(dlmexp);
 368
 369         if (imp->imp_conn_current != imp_conn) {
 370                 if (imp->imp_conn_current)
 371                         LCONSOLE_INFO("Changing connection for %s to %s/%s\n",
 372                                       imp->imp_obd->obd_name,
 373                                       imp_conn->oic_uuid.uuid,
 374                                       libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
 375                 imp->imp_conn_current = imp_conn;
 376         }
 377
 378         CDEBUG(D_HA, "%s: import %p using connection %s/%s\n",
 379                imp->imp_obd->obd_name, imp, imp_conn->oic_uuid.uuid,
 380                libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
 381
 382         spin_unlock(&imp->imp_lock);
 383
 384         RETURN(0);
 385 }
 386
 387 /*
 388  * must be called under imp_lock
 389  */
 390 int ptlrpc_first_transno(struct obd_import *imp, __u64 *transno)
 391 {
 392         struct ptlrpc_request *req;
 393         struct list_head *tmp;
 394
 395         if (list_empty(&imp->imp_replay_list))
 396                 return 0;
 397         tmp = imp->imp_replay_list.next;
 398         req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
 399         *transno = req->rq_transno;
 400         if (req->rq_transno == 0) {
 401                 DEBUG_REQ(D_ERROR, req, "zero transno in replay");
 402                 LBUG();
 403         }
 404
 405         return 1;
 406 }
 407
 408 int ptlrpc_connect_import(struct obd_import *imp, char *new_uuid)
 409 {
 410         struct obd_device *obd = imp->imp_obd;
 411         int initial_connect = 0;
 412         int set_transno = 0;
 413         __u64 committed_before_reconnect = 0;
 414         struct ptlrpc_request *request;
 415         char *bufs[] = { NULL,
 416                          obd2cli_tgt(imp->imp_obd),
 417                          obd->obd_uuid.uuid,
 418                          (char *)&imp->imp_dlm_handle,
 419                          (char *)&imp->imp_connect_data };
 420         struct ptlrpc_connect_async_args *aa;
 421         int rc;
 422         ENTRY;
 423
 424         spin_lock(&imp->imp_lock);
 425         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 426                 spin_unlock(&imp->imp_lock);
 427                 CERROR("can't connect to a closed import\n");
 428                 RETURN(-EINVAL);
 429         } else if (imp->imp_state == LUSTRE_IMP_FULL) {
 430                 spin_unlock(&imp->imp_lock);
 431                 CERROR("already connected\n");
 432                 RETURN(0);
 433         } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
 434                 spin_unlock(&imp->imp_lock);
 435                 CERROR("already connecting\n");
 436                 RETURN(-EALREADY);
 437         }
 438
 439         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
 440
 441         imp->imp_conn_cnt++;
 442         imp->imp_resend_replay = 0;
 443
 444         if (!lustre_handle_is_used(&imp->imp_remote_handle))
 445                 initial_connect = 1;
 446         else
 447                 committed_before_reconnect = imp->imp_peer_committed_transno;
 448
 449         set_transno = ptlrpc_first_transno(imp, &imp->imp_connect_data.ocd_transno);
 450         spin_unlock(&imp->imp_lock);
 451
 452         if (new_uuid) {
 453                 struct obd_uuid uuid;
 454
 455                 obd_str2uuid(&uuid, new_uuid);
 456                 rc = import_set_conn_priority(imp, &uuid);
 457                 if (rc)
 458                         GOTO(out, rc);
 459         }
 460
 461         rc = import_select_connection(imp);
 462         if (rc)
 463                 GOTO(out, rc);
 464
 465         /* last in connection list */
 466         if (imp->imp_conn_current->oic_item.next == &imp->imp_conn_list) {
 467                 if (imp->imp_initial_recov_bk && initial_connect) {
 468                         CDEBUG(D_HA, "Last connection attempt (%d) for %s\n",
 469                                imp->imp_conn_cnt, obd2cli_tgt(imp->imp_obd));
 470                         /* Don't retry if connect fails */
 471                         rc = 0;
 472                         obd_set_info_async(obd->obd_self_export,
 473                                            strlen(KEY_INIT_RECOV),
 474                                            KEY_INIT_RECOV,
 475                                            sizeof(rc), &rc, NULL);
 476                 }
 477                 if (imp->imp_recon_bk) {
 478                         CDEBUG(D_HA, "Last reconnection attempt (%d) for %s\n",
 479                                imp->imp_conn_cnt, obd2cli_tgt(imp->imp_obd));
 480                         spin_lock(&imp->imp_lock);
 481                         imp->imp_last_recon = 1;
 482                         spin_unlock(&imp->imp_lock);
 483                 }
 484         }
 485
 486         rc = sptlrpc_import_sec_adapt(imp, NULL, 0);
 487         if (rc)
 488                 GOTO(out, rc);
 489
 490         /* Reset connect flags to the originally requested flags, in case
 491          * the server is updated on-the-fly we will get the new features. */
 492         imp->imp_connect_data.ocd_connect_flags = imp->imp_connect_flags_orig;
 493         rc = obd_reconnect(NULL, imp->imp_obd->obd_self_export, obd,
 494                            &obd->obd_uuid, &imp->imp_connect_data);
 495         if (rc)
 496                 GOTO(out, rc);
 497
 498         request = ptlrpc_request_alloc(imp, &RQF_MDS_CONNECT);
 499         if (request == NULL)
 500                 GOTO(out, rc = -ENOMEM);
 501
 502         rc = ptlrpc_request_bufs_pack(request, LUSTRE_OBD_VERSION,
 503                                       imp->imp_connect_op, bufs, NULL);
 504         if (rc) {
 505                 ptlrpc_request_free(request);
 506                 GOTO(out, rc);
 507         }
 508
 509 #ifndef __KERNEL__
 510         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_LIBCLIENT);
 511 #endif
 512         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_NEXT_VER);
 513
 514         request->rq_send_state = LUSTRE_IMP_CONNECTING;
 515         /* Allow a slightly larger reply for future growth compatibility */
 516         req_capsule_set_size(&request->rq_pill, &RMF_CONNECT_DATA, RCL_SERVER,
 517                              sizeof(struct obd_connect_data)+16*sizeof(__u64));
 518         ptlrpc_request_set_replen(request);
 519         request->rq_interpret_reply = ptlrpc_connect_interpret;
 520
 521         CLASSERT(sizeof (*aa) <= sizeof (request->rq_async_args));
 522         aa = (struct ptlrpc_connect_async_args *)&request->rq_async_args;
 523         memset(aa, 0, sizeof *aa);
 524
 525         aa->pcaa_peer_committed = committed_before_reconnect;
 526         aa->pcaa_initial_connect = initial_connect;
 527
 528         if (aa->pcaa_initial_connect) {
 529                 spin_lock(&imp->imp_lock);
 530                 imp->imp_replayable = 1;
 531                 spin_unlock(&imp->imp_lock);
 532                 /* On an initial connect, we don't know which one of a
 533                    failover server pair is up.  Don't wait long. */
 534 #ifdef CRAY_XT3
 535                 request->rq_timeout = max((int)(obd_timeout / 2), 5);
 536 #else
 537                 request->rq_timeout = max((int)(obd_timeout / 20), 5);
 538 #endif
 539                 lustre_msg_add_op_flags(request->rq_reqmsg,
 540                                         MSG_CONNECT_INITIAL);
 541         }
 542
 543         if (set_transno)
 544                 lustre_msg_add_op_flags(request->rq_reqmsg,
 545                                         MSG_CONNECT_TRANSNO);
 546
 547         DEBUG_REQ(D_RPCTRACE, request, "(re)connect request");
 548         ptlrpcd_add_req(request);
 549         rc = 0;
 550 out:
 551         if (rc != 0) {
 552                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 553         }
 554
 555         RETURN(rc);
 556 }
 557 EXPORT_SYMBOL(ptlrpc_connect_import);
 558
 559 static void ptlrpc_maybe_ping_import_soon(struct obd_import *imp)
 560 {
 561 #ifdef __KERNEL__
 562         struct obd_import_conn *imp_conn;
 563 #endif
 564         int wake_pinger = 0;
 565
 566         ENTRY;
 567
 568         spin_lock(&imp->imp_lock);
 569         if (list_empty(&imp->imp_conn_list))
 570                 GOTO(unlock, 0);
 571
 572 #ifdef __KERNEL__
 573         imp_conn = list_entry(imp->imp_conn_list.prev,
 574                               struct obd_import_conn,
 575                               oic_item);
 576
 577         /* XXX: When the failover node is the primary node, it is possible
 578          * to have two identical connections in imp_conn_list. We must
 579          * compare not conn's pointers but NIDs, otherwise we can defeat
 580          * connection throttling. (See bug 14774.) */
 581         if (imp->imp_conn_current->oic_conn->c_self !=
 582                                 imp_conn->oic_conn->c_self) {
 583                 ptlrpc_ping_import_soon(imp);
 584                 wake_pinger = 1;
 585         }
 586 #else
 587         /* liblustre has no pinger thead, so we wakup pinger anyway */
 588         wake_pinger = 1;
 589 #endif
 590
 591  unlock:
 592         spin_unlock(&imp->imp_lock);
 593
 594         if (wake_pinger)
 595                 ptlrpc_pinger_wake_up();
 596
 597         EXIT;
 598 }
 599
 600 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
 601                                     void * data, int rc)
 602 {
 603         struct ptlrpc_connect_async_args *aa = data;
 604         struct obd_import *imp = request->rq_import;
 605         struct client_obd *cli = &imp->imp_obd->u.cli;
 606         struct lustre_handle old_hdl;
 607         int msg_flags;
 608         ENTRY;
 609
 610         spin_lock(&imp->imp_lock);
 611         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 612                 spin_unlock(&imp->imp_lock);
 613                 RETURN(0);
 614         }
 615         spin_unlock(&imp->imp_lock);
 616
 617         if (rc)
 618                 GOTO(out, rc);
 619
 620         LASSERT(imp->imp_conn_current);
 621
 622         msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
 623
 624         /* All imports are pingable */
 625         spin_lock(&imp->imp_lock);
 626         imp->imp_pingable = 1;
 627
 628         if (aa->pcaa_initial_connect) {
 629                 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
 630                         imp->imp_replayable = 1;
 631                         spin_unlock(&imp->imp_lock);
 632                         CDEBUG(D_HA, "connected to replayable target: %s\n",
 633                                obd2cli_tgt(imp->imp_obd));
 634                 } else {
 635                         imp->imp_replayable = 0;
 636                         spin_unlock(&imp->imp_lock);
 637                 }
 638
 639                 if (msg_flags & MSG_CONNECT_NEXT_VER) {
 640                         imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2;
 641                         CDEBUG(D_RPCTRACE, "connect to %s with lustre_msg_v2\n",
 642                                obd2cli_tgt(imp->imp_obd));
 643                 } else {
 644                         CDEBUG(D_RPCTRACE, "connect to %s with lustre_msg_v1\n",
 645                                obd2cli_tgt(imp->imp_obd));
 646                 }
 647
 648                 imp->imp_remote_handle =
 649                                 *lustre_msg_get_handle(request->rq_repmsg);
 650
 651                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 652                 ptlrpc_activate_import(imp);
 653                 GOTO(finish, rc = 0);
 654         } else {
 655                 spin_unlock(&imp->imp_lock);
 656         }
 657
 658         /* Determine what recovery state to move the import to. */
 659         if (MSG_CONNECT_RECONNECT & msg_flags) {
 660                 memset(&old_hdl, 0, sizeof(old_hdl));
 661                 if (!memcmp(&old_hdl, lustre_msg_get_handle(request->rq_repmsg),
 662                             sizeof (old_hdl))) {
 663                         CERROR("%s@%s didn't like our handle "LPX64
 664                                ", failed\n", obd2cli_tgt(imp->imp_obd),
 665                                imp->imp_connection->c_remote_uuid.uuid,
 666                                imp->imp_dlm_handle.cookie);
 667                         GOTO(out, rc = -ENOTCONN);
 668                 }
 669
 670                 if (memcmp(&imp->imp_remote_handle,
 671                            lustre_msg_get_handle(request->rq_repmsg),
 672                            sizeof(imp->imp_remote_handle))) {
 673
 674                         CWARN("%s@%s changed server handle from "
 675                                LPX64" to "LPX64" - evicting.\n",
 676                                obd2cli_tgt(imp->imp_obd),
 677                                imp->imp_connection->c_remote_uuid.uuid,
 678                                imp->imp_remote_handle.cookie,
 679                                lustre_msg_get_handle(request->rq_repmsg)->
 680                                          cookie);
 681                         imp->imp_remote_handle =
 682                                      *lustre_msg_get_handle(request->rq_repmsg);
 683
 684                         IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 685                         GOTO(finish, rc = 0);
 686                 } else {
 687                         CDEBUG(D_HA, "reconnected to %s@%s after partition\n",
 688                                obd2cli_tgt(imp->imp_obd),
 689                                imp->imp_connection->c_remote_uuid.uuid);
 690                 }
 691
 692                 if (imp->imp_invalid) {
 693                         IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 694                 } else if (MSG_CONNECT_RECOVERING & msg_flags) {
 695                         CDEBUG(D_HA, "%s: reconnected to %s during replay\n",
 696                                imp->imp_obd->obd_name,
 697                                obd2cli_tgt(imp->imp_obd));
 698
 699                         spin_lock(&imp->imp_lock);
 700                         imp->imp_resend_replay = 1;
 701                         spin_unlock(&imp->imp_lock);
 702
 703                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 704                 } else {
 705                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 706                 }
 707         } else if ((MSG_CONNECT_RECOVERING & msg_flags) && !imp->imp_invalid) {
 708                 LASSERT(imp->imp_replayable);
 709                 imp->imp_remote_handle =
 710                                 *lustre_msg_get_handle(request->rq_repmsg);
 711                 imp->imp_last_replay_transno = 0;
 712                 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 713         } else {
 714                 imp->imp_remote_handle =
 715                                 *lustre_msg_get_handle(request->rq_repmsg);
 716                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 717         }
 718
 719         /* Sanity checks for a reconnected import. */
 720         if (!(imp->imp_replayable) != !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
 721                 CERROR("imp_replayable flag does not match server "
 722                        "after reconnect. We should LBUG right here.\n");
 723         }
 724
 725         if (lustre_msg_get_last_committed(request->rq_repmsg) <
 726             aa->pcaa_peer_committed) {
 727                 CERROR("%s went back in time (transno "LPD64
 728                        " was previously committed, server now claims "LPD64
 729                        ")!  See https://bugzilla.clusterfs.com/"
 730                        "long_list.cgi?buglist=9646\n",
 731                        obd2cli_tgt(imp->imp_obd), aa->pcaa_peer_committed,
 732                        lustre_msg_get_last_committed(request->rq_repmsg));
 733         }
 734
 735 finish:
 736         rc = ptlrpc_import_recovery_state_machine(imp);
 737         if (rc != 0) {
 738                 if (rc == -ENOTCONN) {
 739                         CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
 740                                "invalidating and reconnecting\n",
 741                                obd2cli_tgt(imp->imp_obd),
 742                                imp->imp_connection->c_remote_uuid.uuid);
 743                         ptlrpc_connect_import(imp, NULL);
 744                         RETURN(0);
 745                 }
 746         } else {
 747                 struct obd_connect_data *ocd;
 748                 struct obd_export *exp;
 749                 int ret;
 750                 ret = req_capsule_get_size(&request->rq_pill, &RMF_CONNECT_DATA,
 751                                            RCL_SERVER);
 752                 /* server replied obd_connect_data is always bigger */
 753                 ocd = req_capsule_server_sized_get(&request->rq_pill,
 754                                                    &RMF_CONNECT_DATA, ret);
 755
 756                 spin_lock(&imp->imp_lock);
 757                 list_del(&imp->imp_conn_current->oic_item);
 758                 list_add(&imp->imp_conn_current->oic_item, &imp->imp_conn_list);
 759                 imp->imp_last_success_conn =
 760                         imp->imp_conn_current->oic_last_attempt;
 761
 762                 if (ocd == NULL) {
 763                         spin_unlock(&imp->imp_lock);
 764                         CERROR("Wrong connect data from server\n");
 765                         rc = -EPROTO;
 766                         GOTO(out, rc);
 767                 }
 768
 769                 imp->imp_connect_data = *ocd;
 770
 771                 exp = class_conn2export(&imp->imp_dlm_handle);
 772                 spin_unlock(&imp->imp_lock);
 773
 774                 /* check that server granted subset of flags we asked for. */
 775                 LASSERTF((ocd->ocd_connect_flags &
 776                           imp->imp_connect_flags_orig) ==
 777                          ocd->ocd_connect_flags, LPX64" != "LPX64,
 778                          imp->imp_connect_flags_orig, ocd->ocd_connect_flags);
 779
 780                 if (!exp) {
 781                         /* This could happen if export is cleaned during the
 782                            connect attempt */
 783                         CERROR("Missing export for %s\n",
 784                                imp->imp_obd->obd_name);
 785                         GOTO(out, rc = -ENODEV);
 786                 }
 787                 exp->exp_connect_flags = ocd->ocd_connect_flags;
 788                 imp->imp_obd->obd_self_export->exp_connect_flags =
 789                                                         ocd->ocd_connect_flags;
 790                 class_export_put(exp);
 791
 792                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_OCD);
 793
 794                 if (!ocd->ocd_ibits_known &&
 795                     ocd->ocd_connect_flags & OBD_CONNECT_IBITS)
 796                         CERROR("Inodebits aware server returned zero compatible"
 797                                " bits?\n");
 798
 799                 if ((ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
 800                     (ocd->ocd_version > LUSTRE_VERSION_CODE +
 801                                         LUSTRE_VERSION_OFFSET_WARN ||
 802                      ocd->ocd_version < LUSTRE_VERSION_CODE -
 803                                         LUSTRE_VERSION_OFFSET_WARN)) {
 804                         /* Sigh, some compilers do not like #ifdef in the middle
 805                            of macro arguments */
 806 #ifdef __KERNEL__
 807                         const char *older =
 808                                 "older. Consider upgrading this client";
 809 #else
 810                         const char *older =
 811                                 "older. Consider recompiling this application";
 812 #endif
 813                         const char *newer = "newer than client version";
 814
 815                         LCONSOLE_WARN("Server %s version (%d.%d.%d.%d) "
 816                                       "is much %s (%s)\n",
 817                                       obd2cli_tgt(imp->imp_obd),
 818                                       OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
 819                                       OBD_OCD_VERSION_MINOR(ocd->ocd_version),
 820                                       OBD_OCD_VERSION_PATCH(ocd->ocd_version),
 821                                       OBD_OCD_VERSION_FIX(ocd->ocd_version),
 822                                       ocd->ocd_version > LUSTRE_VERSION_CODE ?
 823                                       newer : older, LUSTRE_VERSION_STRING);
 824                 }
 825
 826                 if (ocd->ocd_connect_flags & OBD_CONNECT_CKSUM) {
 827                         /* We sent to the server ocd_cksum_types with bits set
 828                          * for algorithms we understand. The server masked off
 829                          * the checksum types it doesn't support */
 830                         if ((ocd->ocd_cksum_types & OBD_CKSUM_ALL) == 0) {
 831                                 LCONSOLE_WARN("The negotiation of the checksum "
 832                                               "alogrithm to use with server %s "
 833                                               "failed (%x/%x), disabling "
 834                                               "checksums\n",
 835                                               obd2cli_tgt(imp->imp_obd),
 836                                               ocd->ocd_cksum_types,
 837                                               OBD_CKSUM_ALL);
 838                                 cli->cl_checksum = 0;
 839                                 cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 840                                 cli->cl_cksum_type = OBD_CKSUM_CRC32;
 841                         } else {
 842                                 cli->cl_supp_cksum_types = ocd->ocd_cksum_types;
 843
 844                                 if (ocd->ocd_cksum_types & OSC_DEFAULT_CKSUM)
 845                                         cli->cl_cksum_type = OSC_DEFAULT_CKSUM;
 846                                 else if (ocd->ocd_cksum_types & OBD_CKSUM_ADLER)
 847                                         cli->cl_cksum_type = OBD_CKSUM_ADLER;
 848                                 else
 849                                         cli->cl_cksum_type = OBD_CKSUM_CRC32;
 850                         }
 851                 } else {
 852                         /* The server does not support OBD_CONNECT_CKSUM.
 853                          * Enforce CRC32 for backward compatibility*/
 854                         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 855                         cli->cl_cksum_type = OBD_CKSUM_CRC32;
 856                 }
 857
 858                 if (ocd->ocd_connect_flags & OBD_CONNECT_BRW_SIZE) {
 859                         cli->cl_max_pages_per_rpc =
 860                                 ocd->ocd_brw_size >> CFS_PAGE_SHIFT;
 861                 }
 862
 863                 imp->imp_obd->obd_namespace->ns_connect_flags =
 864                                                         ocd->ocd_connect_flags;
 865                 imp->imp_obd->obd_namespace->ns_orig_connect_flags =
 866                                                         ocd->ocd_connect_flags;
 867
 868                 LASSERT((cli->cl_max_pages_per_rpc <= PTLRPC_MAX_BRW_PAGES) &&
 869                         (cli->cl_max_pages_per_rpc > 0));
 870         }
 871
 872 out:
 873         if (rc != 0) {
 874                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 875                 spin_lock(&imp->imp_lock);
 876                 if (aa->pcaa_initial_connect && !imp->imp_initial_recov &&
 877                     (request->rq_import_generation == imp->imp_generation))
 878                         ptlrpc_deactivate_and_unlock_import(imp);
 879                 else
 880                         spin_unlock(&imp->imp_lock);
 881
 882                 if ((imp->imp_recon_bk && imp->imp_last_recon) ||
 883                     (rc == -EACCES)) {
 884                         /*
 885                          * Give up trying to reconnect
 886                          * EACCES means client has no permission for connection
 887                          */
 888                         imp->imp_obd->obd_no_recov = 1;
 889                         ptlrpc_deactivate_import(imp);
 890                 }
 891
 892                 if (rc == -EPROTO) {
 893                         struct obd_connect_data *ocd;
 894
 895                         /* reply message might not be ready */
 896                         if (request->rq_repmsg == NULL)
 897                                 RETURN(-EPROTO);
 898
 899                         ocd = req_capsule_server_get(&request->rq_pill,
 900                                                      &RMF_CONNECT_DATA);
 901                         if (ocd &&
 902                             (ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
 903                             (ocd->ocd_version != LUSTRE_VERSION_CODE)) {
 904                            /* Actually servers are only supposed to refuse
 905                               connection from liblustre clients, so we should
 906                               never see this from VFS context */
 907                                 LCONSOLE_ERROR_MSG(0x16a, "Server %s version "
 908                                         "(%d.%d.%d.%d)"
 909                                         " refused connection from this client "
 910                                         "with an incompatible version (%s).  "
 911                                         "Client must be recompiled\n",
 912                                         obd2cli_tgt(imp->imp_obd),
 913                                         OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
 914                                         OBD_OCD_VERSION_MINOR(ocd->ocd_version),
 915                                         OBD_OCD_VERSION_PATCH(ocd->ocd_version),
 916                                         OBD_OCD_VERSION_FIX(ocd->ocd_version),
 917                                         LUSTRE_VERSION_STRING);
 918                                 ptlrpc_deactivate_import(imp);
 919                                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CLOSED);
 920                         }
 921                         RETURN(-EPROTO);
 922                 }
 923
 924                 ptlrpc_maybe_ping_import_soon(imp);
 925
 926                 CDEBUG(D_HA, "recovery of %s on %s failed (%d)\n",
 927                        obd2cli_tgt(imp->imp_obd),
 928                        (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
 929         }
 930
 931         spin_lock(&imp->imp_lock);
 932         imp->imp_last_recon = 0;
 933         spin_unlock(&imp->imp_lock);
 934
 935         cfs_waitq_signal(&imp->imp_recovery_waitq);
 936         RETURN(rc);
 937 }
 938
 939 static int completed_replay_interpret(struct ptlrpc_request *req,
 940                                     void * data, int rc)
 941 {
 942         ENTRY;
 943         atomic_dec(&req->rq_import->imp_replay_inflight);
 944         if (req->rq_status == 0) {
 945                 ptlrpc_import_recovery_state_machine(req->rq_import);
 946         } else {
 947                 CDEBUG(D_HA, "%s: LAST_REPLAY message error: %d, "
 948                        "reconnecting\n",
 949                        req->rq_import->imp_obd->obd_name, req->rq_status);
 950                 ptlrpc_connect_import(req->rq_import, NULL);
 951         }
 952
 953         RETURN(0);
 954 }
 955
 956 static int signal_completed_replay(struct obd_import *imp)
 957 {
 958         struct ptlrpc_request *req;
 959         ENTRY;
 960
 961         LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
 962         atomic_inc(&imp->imp_replay_inflight);
 963
 964         req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING, LUSTRE_OBD_VERSION,
 965                                         OBD_PING);
 966         if (req == NULL) {
 967                 atomic_dec(&imp->imp_replay_inflight);
 968                 RETURN(-ENOMEM);
 969         }
 970
 971         ptlrpc_request_set_replen(req);
 972         req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
 973         lustre_msg_add_flags(req->rq_reqmsg,
 974                              MSG_LOCK_REPLAY_DONE | MSG_REQ_REPLAY_DONE);
 975         req->rq_timeout *= 3;
 976         req->rq_interpret_reply = completed_replay_interpret;
 977
 978         ptlrpcd_add_req(req);
 979         RETURN(0);
 980 }
 981
 982 #ifdef __KERNEL__
 983 static int ptlrpc_invalidate_import_thread(void *data)
 984 {
 985         struct obd_import *imp = data;
 986
 987         ENTRY;
 988
 989         ptlrpc_daemonize("ll_imp_inval");
 990
 991         CDEBUG(D_HA, "thread invalidate import %s to %s@%s\n",
 992                imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
 993                imp->imp_connection->c_remote_uuid.uuid);
 994
 995         ptlrpc_invalidate_import(imp);
 996
 997         if (obd_dump_on_eviction) {
 998                 CERROR("dump the log upon eviction\n");
 999                 libcfs_debug_dumplog();
1000         }
1001
1002         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1003         ptlrpc_import_recovery_state_machine(imp);
1004
1005         RETURN(0);
1006 }
1007 #endif
1008
1009 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
1010 {
1011         int rc = 0;
1012         int inflight;
1013         char *target_start;
1014         int target_len;
1015
1016         ENTRY;
1017         if (imp->imp_state == LUSTRE_IMP_EVICTED) {
1018                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1019                           &target_start, &target_len);
1020                 /* Don't care about MGC eviction */
1021                 if (strcmp(imp->imp_obd->obd_type->typ_name,
1022                            LUSTRE_MGC_NAME) != 0) {
1023                         LCONSOLE_ERROR_MSG(0x167, "This client was evicted by "
1024                                            "%.*s; in progress operations using "
1025                                            "this service will fail.\n",
1026                                            target_len, target_start);
1027                 }
1028                 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
1029                        obd2cli_tgt(imp->imp_obd),
1030                        imp->imp_connection->c_remote_uuid.uuid);
1031
1032 #ifdef __KERNEL__
1033                 rc = cfs_kernel_thread(ptlrpc_invalidate_import_thread, imp,
1034                                        CLONE_VM | CLONE_FILES);
1035                 if (rc < 0)
1036                         CERROR("error starting invalidate thread: %d\n", rc);
1037                 else
1038                         rc = 0;
1039                 RETURN(rc);
1040 #else
1041                 ptlrpc_invalidate_import(imp);
1042
1043                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1044 #endif
1045         }
1046
1047         if (imp->imp_state == LUSTRE_IMP_REPLAY) {
1048                 CDEBUG(D_HA, "replay requested by %s\n",
1049                        obd2cli_tgt(imp->imp_obd));
1050                 rc = ptlrpc_replay_next(imp, &inflight);
1051                 if (inflight == 0 &&
1052                     atomic_read(&imp->imp_replay_inflight) == 0) {
1053                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
1054                         rc = ldlm_replay_locks(imp);
1055                         if (rc)
1056                                 GOTO(out, rc);
1057                 }
1058                 rc = 0;
1059         }
1060
1061         if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
1062                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
1063                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
1064                         rc = signal_completed_replay(imp);
1065                         if (rc)
1066                                 GOTO(out, rc);
1067                 }
1068
1069         }
1070
1071         if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
1072                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
1073                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1074                 }
1075         }
1076
1077         if (imp->imp_state == LUSTRE_IMP_RECOVER) {
1078                 CDEBUG(D_HA, "reconnected to %s@%s\n",
1079                        obd2cli_tgt(imp->imp_obd),
1080                        imp->imp_connection->c_remote_uuid.uuid);
1081
1082                 rc = ptlrpc_resend(imp);
1083                 if (rc)
1084                         GOTO(out, rc);
1085                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
1086                 ptlrpc_activate_import(imp);
1087
1088                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1089                           &target_start, &target_len);
1090                 LCONSOLE_INFO("%s: Connection restored to service %.*s "
1091                               "using nid %s.\n", imp->imp_obd->obd_name,
1092                               target_len, target_start,
1093                               libcfs_nid2str(imp->imp_connection->c_peer.nid));
1094         }
1095
1096         if (imp->imp_state == LUSTRE_IMP_FULL) {
1097                 cfs_waitq_signal(&imp->imp_recovery_waitq);
1098                 ptlrpc_wake_delayed(imp);
1099         }
1100
1101 out:
1102         RETURN(rc);
1103 }
1104
1105 static int back_to_sleep(void *unused)
1106 {
1107         return 0;
1108 }
1109
1110 int ptlrpc_disconnect_import(struct obd_import *imp, int noclose)
1111 {
1112         struct ptlrpc_request *req;
1113         int rq_opc, rc = 0;
1114         int nowait = imp->imp_obd->obd_force;
1115         ENTRY;
1116
1117         if (nowait)
1118                 GOTO(set_state, rc);
1119
1120         switch (imp->imp_connect_op) {
1121         case OST_CONNECT: rq_opc = OST_DISCONNECT; break;
1122         case MDS_CONNECT: rq_opc = MDS_DISCONNECT; break;
1123         case MGS_CONNECT: rq_opc = MGS_DISCONNECT; break;
1124         default:
1125                 CERROR("don't know how to disconnect from %s (connect_op %d)\n",
1126                        obd2cli_tgt(imp->imp_obd), imp->imp_connect_op);
1127                 RETURN(-EINVAL);
1128         }
1129
1130         if (ptlrpc_import_in_recovery(imp)) {
1131                 struct l_wait_info lwi;
1132                 cfs_duration_t timeout;
1133                 if (imp->imp_server_timeout)
1134                         timeout = cfs_time_seconds(obd_timeout / 2);
1135                 else
1136                         timeout = cfs_time_seconds(obd_timeout);
1137
1138                 timeout = MAX(timeout * HZ, 1);
1139
1140                 lwi = LWI_TIMEOUT_INTR(cfs_timeout_cap(timeout),
1141                                        back_to_sleep, LWI_ON_SIGNAL_NOOP, NULL);
1142                 rc = l_wait_event(imp->imp_recovery_waitq,
1143                                   !ptlrpc_import_in_recovery(imp), &lwi);
1144
1145         }
1146
1147         spin_lock(&imp->imp_lock);
1148         if (imp->imp_state != LUSTRE_IMP_FULL)
1149                 GOTO(out, 0);
1150
1151         spin_unlock(&imp->imp_lock);
1152
1153         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_DISCONNECT,
1154                                         LUSTRE_OBD_VERSION, rq_opc);
1155         if (req) {
1156                 /* We are disconnecting, do not retry a failed DISCONNECT rpc if
1157                  * it fails.  We can get through the above with a down server
1158                  * if the client doesn't know the server is gone yet. */
1159                 req->rq_no_resend = 1;
1160 #ifdef CRAY_XT3
1161                 req->rq_timeout = obd_timeout / 3;
1162 #else
1163                 req->rq_timeout = 5;
1164 #endif
1165                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
1166                 req->rq_send_state =  LUSTRE_IMP_CONNECTING;
1167                 ptlrpc_request_set_replen(req);
1168                 rc = ptlrpc_queue_wait(req);
1169                 ptlrpc_req_finished(req);
1170         }
1171
1172 set_state:
1173         spin_lock(&imp->imp_lock);
1174 out:
1175         if (noclose)
1176                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
1177         else
1178                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
1179         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
1180         imp->imp_conn_cnt = 0;
1181         imp->imp_last_recon = 0;
1182         spin_unlock(&imp->imp_lock);
1183
1184         RETURN(rc);
1185 }
1186