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 /*
 167  * This acts as a barrier; all existing requests are rejected, and
 168  * no new requests will be accepted until the import is valid again.
 169  */
 170 void ptlrpc_deactivate_import(struct obd_import *imp)
 171 {
 172         ENTRY;
 173
 174         spin_lock(&imp->imp_lock);
 175         if (imp->imp_invalid) {
 176                 spin_unlock(&imp->imp_lock);
 177                 EXIT;
 178                 return;
 179         }
 180
 181         CDEBUG(D_HA, "setting import %s INVALID\n", obd2cli_tgt(imp->imp_obd));
 182         imp->imp_invalid = 1;
 183         imp->imp_generation++;
 184         spin_unlock(&imp->imp_lock);
 185
 186         ptlrpc_abort_inflight(imp);
 187         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
 188
 189         EXIT;
 190 }
 191
 192 /*
 193  * This function will invalidate the import, if necessary, then block
 194  * for all the RPC completions, and finally notify the obd to
 195  * invalidate its state (ie cancel locks, clear pending requests,
 196  * etc).
 197  */
 198 void ptlrpc_invalidate_import(struct obd_import *imp)
 199 {
 200         struct l_wait_info lwi;
 201         int rc;
 202
 203         ptlrpc_deactivate_import(imp);
 204
 205         LASSERT(imp->imp_invalid);
 206
 207         /* wait for all requests to error out and call completion callbacks */
 208         lwi = LWI_TIMEOUT_INTERVAL(cfs_timeout_cap(cfs_time_seconds(obd_timeout)),
 209                                    HZ, NULL, NULL);
 210         rc = l_wait_event(imp->imp_recovery_waitq,
 211                           (atomic_read(&imp->imp_inflight) == 0), &lwi);
 212
 213         if (rc)
 214                 CDEBUG(D_HA, "%s: rc = %d waiting for callback (%d != 0)\n",
 215                        obd2cli_tgt(imp->imp_obd), rc,
 216                        atomic_read(&imp->imp_inflight));
 217
 218         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
 219         sptlrpc_import_flush_all_ctx(imp);
 220 }
 221
 222 /* unset imp_invalid */
 223 void ptlrpc_activate_import(struct obd_import *imp)
 224 {
 225         struct obd_device *obd = imp->imp_obd;
 226
 227         spin_lock(&imp->imp_lock);
 228         imp->imp_invalid = 0;
 229         ptlrpc_activate_timeouts(imp);
 230         spin_unlock(&imp->imp_lock);
 231         obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
 232 }
 233
 234 void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt)
 235 {
 236         ENTRY;
 237
 238         LASSERT(!imp->imp_dlm_fake);
 239
 240         if (ptlrpc_set_import_discon(imp, conn_cnt)) {
 241                 if (!imp->imp_replayable) {
 242                         CDEBUG(D_HA, "import %s@%s for %s not replayable, "
 243                                "auto-deactivating\n",
 244                                obd2cli_tgt(imp->imp_obd),
 245                                imp->imp_connection->c_remote_uuid.uuid,
 246                                imp->imp_obd->obd_name);
 247                         ptlrpc_deactivate_import(imp);
 248                 }
 249
 250                 CDEBUG(D_HA, "%s: waking up pinger\n",
 251                        obd2cli_tgt(imp->imp_obd));
 252
 253                 spin_lock(&imp->imp_lock);
 254                 imp->imp_force_verify = 1;
 255                 spin_unlock(&imp->imp_lock);
 256
 257                 ptlrpc_pinger_wake_up();
 258         }
 259         EXIT;
 260 }
 261
 262 static int import_select_connection(struct obd_import *imp)
 263 {
 264         struct obd_import_conn *imp_conn = NULL, *conn;
 265         struct obd_export *dlmexp;
 266         ENTRY;
 267
 268         spin_lock(&imp->imp_lock);
 269
 270         if (list_empty(&imp->imp_conn_list)) {
 271                 CERROR("%s: no connections available\n",
 272                         imp->imp_obd->obd_name);
 273                 spin_unlock(&imp->imp_lock);
 274                 RETURN(-EINVAL);
 275         }
 276
 277         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 278                 CDEBUG(D_HA, "%s: connect to NID %s last attempt "LPU64"\n",
 279                        imp->imp_obd->obd_name,
 280                        libcfs_nid2str(conn->oic_conn->c_peer.nid),
 281                        conn->oic_last_attempt);
 282                 /* Throttle the reconnect rate to once per RECONNECT_INTERVAL */
 283                 if (cfs_time_before_64(conn->oic_last_attempt +
 284                                        RECONNECT_INTERVAL * HZ,
 285                                        cfs_time_current_64())) {
 286                         /* If we have never tried this connection since the
 287                            the last successful attempt, go with this one */
 288                         if (cfs_time_before_64(conn->oic_last_attempt,
 289                                                imp->imp_last_success_conn)) {
 290                                 imp_conn = conn;
 291                                 break;
 292                         }
 293
 294                         /* Both of these connections have already been tried
 295                            since the last successful connection; just choose the
 296                            least recently used */
 297                         if (!imp_conn)
 298                                 imp_conn = conn;
 299                         else if (cfs_time_before_64(conn->oic_last_attempt,
 300                                                     imp_conn->oic_last_attempt))
 301                                 imp_conn = conn;
 302                 }
 303         }
 304
 305         /* if not found, simply choose the current one */
 306         if (!imp_conn) {
 307                 LASSERT(imp->imp_conn_current);
 308                 imp_conn = imp->imp_conn_current;
 309         }
 310         LASSERT(imp_conn->oic_conn);
 311
 312         imp_conn->oic_last_attempt = cfs_time_current_64();
 313
 314         /* switch connection, don't mind if it's same as the current one */
 315         if (imp->imp_connection)
 316                 ptlrpc_put_connection(imp->imp_connection);
 317         imp->imp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 318
 319         dlmexp =  class_conn2export(&imp->imp_dlm_handle);
 320         LASSERT(dlmexp != NULL);
 321         if (dlmexp->exp_connection)
 322                 ptlrpc_put_connection(dlmexp->exp_connection);
 323         dlmexp->exp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 324         class_export_put(dlmexp);
 325
 326         if (imp->imp_conn_current != imp_conn) {
 327                 if (imp->imp_conn_current)
 328                         LCONSOLE_INFO("Changing connection for %s to %s/%s\n",
 329                                       imp->imp_obd->obd_name,
 330                                       imp_conn->oic_uuid.uuid,
 331                                       libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
 332                 imp->imp_conn_current = imp_conn;
 333         }
 334
 335         CDEBUG(D_HA, "%s: import %p using connection %s/%s\n",
 336                imp->imp_obd->obd_name, imp, imp_conn->oic_uuid.uuid,
 337                libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
 338
 339         spin_unlock(&imp->imp_lock);
 340
 341         RETURN(0);
 342 }
 343
 344 /*
 345  * must be called under imp_lock
 346  */
 347 int ptlrpc_first_transno(struct obd_import *imp, __u64 *transno)
 348 {
 349         struct ptlrpc_request *req;
 350         struct list_head *tmp;
 351
 352         if (list_empty(&imp->imp_replay_list))
 353                 return 0;
 354         tmp = imp->imp_replay_list.next;
 355         req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
 356         *transno = req->rq_transno;
 357         return 1;
 358 }
 359
 360 int ptlrpc_connect_import(struct obd_import *imp, char *new_uuid)
 361 {
 362         struct obd_device *obd = imp->imp_obd;
 363         int initial_connect = 0;
 364         int set_transno = 0;
 365         int rc;
 366         __u64 committed_before_reconnect = 0;
 367         struct ptlrpc_request *request;
 368         int size[] = { sizeof(struct ptlrpc_body),
 369                        sizeof(imp->imp_obd->u.cli.cl_target_uuid),
 370                        sizeof(obd->obd_uuid),
 371                        sizeof(imp->imp_dlm_handle),
 372                        sizeof(imp->imp_connect_data) };
 373         char *tmp[] = { NULL,
 374                         obd2cli_tgt(imp->imp_obd),
 375                         obd->obd_uuid.uuid,
 376                         (char *)&imp->imp_dlm_handle,
 377                         (char *)&imp->imp_connect_data };
 378         struct ptlrpc_connect_async_args *aa;
 379         ENTRY;
 380
 381         spin_lock(&imp->imp_lock);
 382         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 383                 spin_unlock(&imp->imp_lock);
 384                 CERROR("can't connect to a closed import\n");
 385                 RETURN(-EINVAL);
 386         } else if (imp->imp_state == LUSTRE_IMP_FULL) {
 387                 spin_unlock(&imp->imp_lock);
 388                 CERROR("already connected\n");
 389                 RETURN(0);
 390         } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
 391                 spin_unlock(&imp->imp_lock);
 392                 CERROR("already connecting\n");
 393                 RETURN(-EALREADY);
 394         }
 395
 396         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
 397
 398         imp->imp_conn_cnt++;
 399         imp->imp_resend_replay = 0;
 400
 401         if (!lustre_handle_is_used(&imp->imp_remote_handle))
 402                 initial_connect = 1;
 403         else
 404                 committed_before_reconnect = imp->imp_peer_committed_transno;
 405
 406         set_transno = ptlrpc_first_transno(imp, &imp->imp_connect_data.ocd_transno);
 407         spin_unlock(&imp->imp_lock);
 408
 409         if (new_uuid) {
 410                 struct obd_uuid uuid;
 411
 412                 obd_str2uuid(&uuid, new_uuid);
 413                 rc = import_set_conn_priority(imp, &uuid);
 414                 if (rc)
 415                         GOTO(out, rc);
 416         }
 417
 418         rc = import_select_connection(imp);
 419         if (rc)
 420                 GOTO(out, rc);
 421
 422         /* last in connection list */
 423         if (imp->imp_conn_current->oic_item.next == &imp->imp_conn_list) {
 424                 if (imp->imp_initial_recov_bk && initial_connect) {
 425                         CDEBUG(D_HA, "Last connection attempt (%d) for %s\n",
 426                                imp->imp_conn_cnt, obd2cli_tgt(imp->imp_obd));
 427                         /* Don't retry if connect fails */
 428                         rc = 0;
 429                         obd_set_info_async(obd->obd_self_export,
 430                                            strlen(KEY_INIT_RECOV),
 431                                            KEY_INIT_RECOV,
 432                                            sizeof(rc), &rc, NULL);
 433                 }
 434                 if (imp->imp_recon_bk) {
 435                         CDEBUG(D_HA, "Last reconnection attempt (%d) for %s\n",
 436                                imp->imp_conn_cnt, obd2cli_tgt(imp->imp_obd));
 437                         spin_lock(&imp->imp_lock);
 438                         imp->imp_last_recon = 1;
 439                         spin_unlock(&imp->imp_lock);
 440                 }
 441         }
 442
 443         /* Reset connect flags to the originally requested flags, in case
 444          * the server is updated on-the-fly we will get the new features. */
 445         imp->imp_connect_data.ocd_connect_flags = imp->imp_connect_flags_orig;
 446         rc = obd_reconnect(imp->imp_obd->obd_self_export, obd,
 447                            &obd->obd_uuid, &imp->imp_connect_data);
 448         if (rc)
 449                 GOTO(out, rc);
 450
 451         request = ptlrpc_prep_req(imp, LUSTRE_OBD_VERSION, imp->imp_connect_op,
 452                                   5, size, tmp);
 453         if (!request)
 454                 GOTO(out, rc = -ENOMEM);
 455
 456 #ifndef __KERNEL__
 457         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_LIBCLIENT);
 458 #endif
 459         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_NEXT_VER);
 460
 461         request->rq_send_state = LUSTRE_IMP_CONNECTING;
 462         /* Allow a slightly larger reply for future growth compatibility */
 463         size[REPLY_REC_OFF] = sizeof(struct obd_connect_data) +
 464                               16 * sizeof(__u64);
 465         ptlrpc_req_set_repsize(request, 2, size);
 466         request->rq_interpret_reply = ptlrpc_connect_interpret;
 467
 468         CLASSERT(sizeof (*aa) <= sizeof (request->rq_async_args));
 469         aa = (struct ptlrpc_connect_async_args *)&request->rq_async_args;
 470         memset(aa, 0, sizeof *aa);
 471
 472         aa->pcaa_peer_committed = committed_before_reconnect;
 473         aa->pcaa_initial_connect = initial_connect;
 474
 475         if (aa->pcaa_initial_connect) {
 476                 spin_lock(&imp->imp_lock);
 477                 imp->imp_replayable = 1;
 478                 spin_unlock(&imp->imp_lock);
 479                 /* On an initial connect, we don't know which one of a
 480                    failover server pair is up.  Don't wait long. */
 481 #ifdef CRAY_XT3
 482                 request->rq_timeout = max((int)(obd_timeout / 2), 5);
 483 #else
 484                 request->rq_timeout = max((int)(obd_timeout / 20), 5);
 485 #endif
 486                 lustre_msg_add_op_flags(request->rq_reqmsg,
 487                                         MSG_CONNECT_INITIAL);
 488         }
 489
 490         if (set_transno)
 491                 lustre_msg_add_op_flags(request->rq_reqmsg,
 492                                         MSG_CONNECT_TRANSNO);
 493
 494         DEBUG_REQ(D_RPCTRACE, request, "(re)connect request");
 495         ptlrpcd_add_req(request);
 496         rc = 0;
 497 out:
 498         if (rc != 0) {
 499                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 500         }
 501
 502         RETURN(rc);
 503 }
 504 EXPORT_SYMBOL(ptlrpc_connect_import);
 505
 506 static void ptlrpc_maybe_ping_import_soon(struct obd_import *imp)
 507 {
 508 #ifdef __KERNEL__
 509         struct obd_import_conn *imp_conn;
 510 #endif
 511         int wake_pinger = 0;
 512
 513         ENTRY;
 514
 515         spin_lock(&imp->imp_lock);
 516         if (list_empty(&imp->imp_conn_list))
 517                 GOTO(unlock, 0);
 518
 519 #ifdef __KERNEL__
 520         imp_conn = list_entry(imp->imp_conn_list.prev,
 521                               struct obd_import_conn,
 522                               oic_item);
 523
 524         if (imp->imp_conn_current != imp_conn) {
 525                 ptlrpc_ping_import_soon(imp);
 526                 wake_pinger = 1;
 527         }
 528 #else
 529         /* liblustre has no pinger thead, so we wakup pinger anyway */
 530         wake_pinger = 1;
 531 #endif
 532
 533  unlock:
 534         spin_unlock(&imp->imp_lock);
 535
 536         if (wake_pinger)
 537                 ptlrpc_pinger_wake_up();
 538
 539         EXIT;
 540 }
 541
 542 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
 543                                     void * data, int rc)
 544 {
 545         struct ptlrpc_connect_async_args *aa = data;
 546         struct obd_import *imp = request->rq_import;
 547         struct client_obd *cli = &imp->imp_obd->u.cli;
 548         struct lustre_handle old_hdl;
 549         int msg_flags;
 550         ENTRY;
 551
 552         spin_lock(&imp->imp_lock);
 553         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 554                 spin_unlock(&imp->imp_lock);
 555                 RETURN(0);
 556         }
 557         spin_unlock(&imp->imp_lock);
 558
 559         if (rc)
 560                 GOTO(out, rc);
 561
 562         rc = sptlrpc_cli_install_rvs_ctx(imp, request->rq_cli_ctx);
 563         if (rc)
 564                 GOTO(out, rc);
 565
 566         LASSERT(imp->imp_conn_current);
 567
 568         msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
 569
 570         /* All imports are pingable */
 571         spin_lock(&imp->imp_lock);
 572         imp->imp_pingable = 1;
 573
 574         if (aa->pcaa_initial_connect) {
 575                 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
 576                         imp->imp_replayable = 1;
 577                         spin_unlock(&imp->imp_lock);
 578                         CDEBUG(D_HA, "connected to replayable target: %s\n",
 579                                obd2cli_tgt(imp->imp_obd));
 580                 } else {
 581                         imp->imp_replayable = 0;
 582                         spin_unlock(&imp->imp_lock);
 583                 }
 584
 585                 if (msg_flags & MSG_CONNECT_NEXT_VER) {
 586                         imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2;
 587                         CDEBUG(D_RPCTRACE, "connect to %s with lustre_msg_v2\n",
 588                                obd2cli_tgt(imp->imp_obd));
 589                 } else {
 590                         CDEBUG(D_RPCTRACE, "connect to %s with lustre_msg_v1\n",
 591                                obd2cli_tgt(imp->imp_obd));
 592                 }
 593
 594                 imp->imp_remote_handle =
 595                                 *lustre_msg_get_handle(request->rq_repmsg);
 596
 597                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 598                 GOTO(finish, rc = 0);
 599         } else {
 600                 spin_unlock(&imp->imp_lock);
 601         }
 602
 603         /* Determine what recovery state to move the import to. */
 604         if (MSG_CONNECT_RECONNECT & msg_flags) {
 605                 memset(&old_hdl, 0, sizeof(old_hdl));
 606                 if (!memcmp(&old_hdl, lustre_msg_get_handle(request->rq_repmsg),
 607                             sizeof (old_hdl))) {
 608                         CERROR("%s@%s didn't like our handle "LPX64
 609                                ", failed\n", obd2cli_tgt(imp->imp_obd),
 610                                imp->imp_connection->c_remote_uuid.uuid,
 611                                imp->imp_dlm_handle.cookie);
 612                         GOTO(out, rc = -ENOTCONN);
 613                 }
 614
 615                 if (memcmp(&imp->imp_remote_handle,
 616                            lustre_msg_get_handle(request->rq_repmsg),
 617                            sizeof(imp->imp_remote_handle))) {
 618                         int level = D_ERROR;
 619                         /* Old MGC can reconnect to a restarted MGS */
 620                         if (strcmp(imp->imp_obd->obd_type->typ_name,
 621                                    LUSTRE_MGC_NAME) == 0) {
 622                                 level = D_CONFIG;
 623                         }
 624                         CDEBUG(level,
 625                                "%s@%s changed handle from "LPX64" to "LPX64
 626                                "; copying, but this may foreshadow disaster\n",
 627                                obd2cli_tgt(imp->imp_obd),
 628                                imp->imp_connection->c_remote_uuid.uuid,
 629                                imp->imp_remote_handle.cookie,
 630                                lustre_msg_get_handle(request->rq_repmsg)->
 631                                         cookie);
 632                         imp->imp_remote_handle =
 633                                      *lustre_msg_get_handle(request->rq_repmsg);
 634                 } else {
 635                         CDEBUG(D_HA, "reconnected to %s@%s after partition\n",
 636                                obd2cli_tgt(imp->imp_obd),
 637                                imp->imp_connection->c_remote_uuid.uuid);
 638                 }
 639
 640                 if (imp->imp_invalid) {
 641                         IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 642                 } else if (MSG_CONNECT_RECOVERING & msg_flags) {
 643                         CDEBUG(D_HA, "%s: reconnected to %s during replay\n",
 644                                imp->imp_obd->obd_name,
 645                                obd2cli_tgt(imp->imp_obd));
 646
 647                         spin_lock(&imp->imp_lock);
 648                         imp->imp_resend_replay = 1;
 649                         spin_unlock(&imp->imp_lock);
 650
 651                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 652                 } else {
 653                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 654                 }
 655         } else if ((MSG_CONNECT_RECOVERING & msg_flags) && !imp->imp_invalid) {
 656                 LASSERT(imp->imp_replayable);
 657                 imp->imp_remote_handle =
 658                                 *lustre_msg_get_handle(request->rq_repmsg);
 659                 imp->imp_last_replay_transno = 0;
 660                 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 661         } else {
 662                 imp->imp_remote_handle =
 663                                 *lustre_msg_get_handle(request->rq_repmsg);
 664                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 665         }
 666
 667         /* Sanity checks for a reconnected import. */
 668         if (!(imp->imp_replayable) != !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
 669                 CERROR("imp_replayable flag does not match server "
 670                        "after reconnect. We should LBUG right here.\n");
 671         }
 672
 673         if (lustre_msg_get_last_committed(request->rq_repmsg) <
 674             aa->pcaa_peer_committed) {
 675                 CERROR("%s went back in time (transno "LPD64
 676                        " was previously committed, server now claims "LPD64
 677                        ")!  See https://bugzilla.clusterfs.com/"
 678                        "long_list.cgi?buglist=9646\n",
 679                        obd2cli_tgt(imp->imp_obd), aa->pcaa_peer_committed,
 680                        lustre_msg_get_last_committed(request->rq_repmsg));
 681         }
 682
 683 finish:
 684         rc = ptlrpc_import_recovery_state_machine(imp);
 685         if (rc != 0) {
 686                 if (rc == -ENOTCONN) {
 687                         CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
 688                                "invalidating and reconnecting\n",
 689                                obd2cli_tgt(imp->imp_obd),
 690                                imp->imp_connection->c_remote_uuid.uuid);
 691                         ptlrpc_connect_import(imp, NULL);
 692                         RETURN(0);
 693                 }
 694         } else {
 695                 struct obd_connect_data *ocd;
 696                 struct obd_export *exp;
 697
 698                 ocd = lustre_swab_repbuf(request, REPLY_REC_OFF, sizeof(*ocd),
 699                                          lustre_swab_connect);
 700
 701                 spin_lock(&imp->imp_lock);
 702                 list_del(&imp->imp_conn_current->oic_item);
 703                 list_add(&imp->imp_conn_current->oic_item, &imp->imp_conn_list);
 704                 imp->imp_last_success_conn =
 705                         imp->imp_conn_current->oic_last_attempt;
 706
 707                 if (ocd == NULL) {
 708                         spin_unlock(&imp->imp_lock);
 709                         CERROR("Wrong connect data from server\n");
 710                         rc = -EPROTO;
 711                         GOTO(out, rc);
 712                 }
 713
 714                 imp->imp_connect_data = *ocd;
 715
 716                 exp = class_conn2export(&imp->imp_dlm_handle);
 717                 spin_unlock(&imp->imp_lock);
 718
 719                 /* check that server granted subset of flags we asked for. */
 720                 LASSERTF((ocd->ocd_connect_flags &
 721                           imp->imp_connect_flags_orig) ==
 722                          ocd->ocd_connect_flags, LPX64" != "LPX64,
 723                          imp->imp_connect_flags_orig, ocd->ocd_connect_flags);
 724
 725                 if (!exp) {
 726                         /* This could happen if export is cleaned during the
 727                            connect attempt */
 728                         CERROR("Missing export for %s\n",
 729                                imp->imp_obd->obd_name);
 730                         GOTO(out, rc = -ENODEV);
 731                 }
 732                 exp->exp_connect_flags = ocd->ocd_connect_flags;
 733                 class_export_put(exp);
 734
 735                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_OCD);
 736
 737                 if (!ocd->ocd_ibits_known &&
 738                     ocd->ocd_connect_flags & OBD_CONNECT_IBITS)
 739                         CERROR("Inodebits aware server returned zero compatible"
 740                                " bits?\n");
 741
 742                 if ((ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
 743                     (ocd->ocd_version > LUSTRE_VERSION_CODE +
 744                                         LUSTRE_VERSION_OFFSET_WARN ||
 745                      ocd->ocd_version < LUSTRE_VERSION_CODE -
 746                                         LUSTRE_VERSION_OFFSET_WARN)) {
 747                         /* Sigh, some compilers do not like #ifdef in the middle
 748                            of macro arguments */
 749 #ifdef __KERNEL__
 750                         const char *older =
 751                                 "older. Consider upgrading this client";
 752 #else
 753                         const char *older =
 754                                 "older. Consider recompiling this application";
 755 #endif
 756                         const char *newer = "newer than client version";
 757
 758                         LCONSOLE_WARN("Server %s version (%d.%d.%d.%d) "
 759                                       "is much %s (%s)\n",
 760                                       obd2cli_tgt(imp->imp_obd),
 761                                       OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
 762                                       OBD_OCD_VERSION_MINOR(ocd->ocd_version),
 763                                       OBD_OCD_VERSION_PATCH(ocd->ocd_version),
 764                                       OBD_OCD_VERSION_FIX(ocd->ocd_version),
 765                                       ocd->ocd_version > LUSTRE_VERSION_CODE ?
 766                                       newer : older, LUSTRE_VERSION_STRING);
 767                 }
 768
 769                 if (ocd->ocd_connect_flags & OBD_CONNECT_BRW_SIZE) {
 770                         cli->cl_max_pages_per_rpc =
 771                                 ocd->ocd_brw_size >> CFS_PAGE_SHIFT;
 772                 }
 773
 774                 LASSERT((cli->cl_max_pages_per_rpc <= PTLRPC_MAX_BRW_PAGES) &&
 775                         (cli->cl_max_pages_per_rpc > 0));
 776         }
 777
 778 out:
 779         if (rc != 0) {
 780                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 781                 if (aa->pcaa_initial_connect && !imp->imp_initial_recov)
 782                         ptlrpc_deactivate_import(imp);
 783
 784                 if ((imp->imp_recon_bk && imp->imp_last_recon) ||
 785                     (rc == -EACCES)) {
 786                         /*
 787                          * Give up trying to reconnect
 788                          * EACCES means client has no permission for connection
 789                          */
 790                         imp->imp_obd->obd_no_recov = 1;
 791                         ptlrpc_deactivate_import(imp);
 792                 }
 793
 794                 if (rc == -EPROTO) {
 795                         struct obd_connect_data *ocd;
 796
 797                         /* reply message might not be ready */
 798                         if (request->rq_repmsg != NULL)
 799                                 RETURN(-EPROTO);
 800
 801                         ocd = lustre_swab_repbuf(request, REPLY_REC_OFF,
 802                                                  sizeof *ocd,
 803                                                  lustre_swab_connect);
 804                         if (ocd &&
 805                             (ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
 806                             (ocd->ocd_version != LUSTRE_VERSION_CODE)) {
 807                            /* Actually servers are only supposed to refuse
 808                               connection from liblustre clients, so we should
 809                               never see this from VFS context */
 810                                 LCONSOLE_ERROR_MSG(0x16a, "Server %s version "
 811                                         "(%d.%d.%d.%d)"
 812                                         " refused connection from this client "
 813                                         "with an incompatible version (%s).  "
 814                                         "Client must be recompiled\n",
 815                                         obd2cli_tgt(imp->imp_obd),
 816                                         OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
 817                                         OBD_OCD_VERSION_MINOR(ocd->ocd_version),
 818                                         OBD_OCD_VERSION_PATCH(ocd->ocd_version),
 819                                         OBD_OCD_VERSION_FIX(ocd->ocd_version),
 820                                         LUSTRE_VERSION_STRING);
 821                                 ptlrpc_deactivate_import(imp);
 822                                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CLOSED);
 823                         }
 824                         RETURN(-EPROTO);
 825                 }
 826
 827                 ptlrpc_maybe_ping_import_soon(imp);
 828
 829                 CDEBUG(D_HA, "recovery of %s on %s failed (%d)\n",
 830                        obd2cli_tgt(imp->imp_obd),
 831                        (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
 832         }
 833
 834         spin_lock(&imp->imp_lock);
 835         imp->imp_last_recon = 0;
 836         spin_unlock(&imp->imp_lock);
 837
 838         cfs_waitq_signal(&imp->imp_recovery_waitq);
 839         RETURN(rc);
 840 }
 841
 842 static int completed_replay_interpret(struct ptlrpc_request *req,
 843                                     void * data, int rc)
 844 {
 845         ENTRY;
 846         atomic_dec(&req->rq_import->imp_replay_inflight);
 847         if (req->rq_status == 0) {
 848                 ptlrpc_import_recovery_state_machine(req->rq_import);
 849         } else {
 850                 CDEBUG(D_HA, "%s: LAST_REPLAY message error: %d, "
 851                        "reconnecting\n",
 852                        req->rq_import->imp_obd->obd_name, req->rq_status);
 853                 ptlrpc_connect_import(req->rq_import, NULL);
 854         }
 855
 856         RETURN(0);
 857 }
 858
 859 static int signal_completed_replay(struct obd_import *imp)
 860 {
 861         struct ptlrpc_request *req;
 862         ENTRY;
 863
 864         LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
 865         atomic_inc(&imp->imp_replay_inflight);
 866
 867         req = ptlrpc_prep_req(imp, LUSTRE_OBD_VERSION, OBD_PING, 1, NULL, NULL);
 868         if (!req) {
 869                 atomic_dec(&imp->imp_replay_inflight);
 870                 RETURN(-ENOMEM);
 871         }
 872
 873         ptlrpc_req_set_repsize(req, 1, NULL);
 874         req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
 875         lustre_msg_add_flags(req->rq_reqmsg,
 876                              MSG_LOCK_REPLAY_DONE | MSG_REQ_REPLAY_DONE);
 877         req->rq_timeout *= 3;
 878         req->rq_interpret_reply = completed_replay_interpret;
 879
 880         ptlrpcd_add_req(req);
 881         RETURN(0);
 882 }
 883
 884 #ifdef __KERNEL__
 885 static int ptlrpc_invalidate_import_thread(void *data)
 886 {
 887         struct obd_import *imp = data;
 888
 889         ENTRY;
 890
 891         ptlrpc_daemonize("ll_imp_inval");
 892
 893         CDEBUG(D_HA, "thread invalidate import %s to %s@%s\n",
 894                imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
 895                imp->imp_connection->c_remote_uuid.uuid);
 896
 897         ptlrpc_invalidate_import(imp);
 898
 899         if (obd_dump_on_eviction) {
 900                 CERROR("dump the log upon eviction\n");
 901                 libcfs_debug_dumplog();
 902         }
 903
 904         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 905         ptlrpc_import_recovery_state_machine(imp);
 906
 907         RETURN(0);
 908 }
 909 #endif
 910
 911 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
 912 {
 913         int rc = 0;
 914         int inflight;
 915         char *target_start;
 916         int target_len;
 917
 918         ENTRY;
 919         if (imp->imp_state == LUSTRE_IMP_EVICTED) {
 920                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
 921                           &target_start, &target_len);
 922                 /* Don't care about MGC eviction */
 923                 if (strcmp(imp->imp_obd->obd_type->typ_name,
 924                            LUSTRE_MGC_NAME) != 0) {
 925                         LCONSOLE_ERROR_MSG(0x167, "This client was evicted by "
 926                                            "%.*s; in progress operations using "
 927                                            "this service will fail.\n",
 928                                            target_len, target_start);
 929                 }
 930                 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
 931                        obd2cli_tgt(imp->imp_obd),
 932                        imp->imp_connection->c_remote_uuid.uuid);
 933
 934 #ifdef __KERNEL__
 935                 rc = cfs_kernel_thread(ptlrpc_invalidate_import_thread, imp,
 936                                        CLONE_VM | CLONE_FILES);
 937                 if (rc < 0)
 938                         CERROR("error starting invalidate thread: %d\n", rc);
 939                 else
 940                         rc = 0;
 941                 RETURN(rc);
 942 #else
 943                 ptlrpc_invalidate_import(imp);
 944
 945                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 946 #endif
 947         }
 948
 949         if (imp->imp_state == LUSTRE_IMP_REPLAY) {
 950                 CDEBUG(D_HA, "replay requested by %s\n",
 951                        obd2cli_tgt(imp->imp_obd));
 952                 rc = ptlrpc_replay_next(imp, &inflight);
 953                 if (inflight == 0 &&
 954                     atomic_read(&imp->imp_replay_inflight) == 0) {
 955                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
 956                         rc = ldlm_replay_locks(imp);
 957                         if (rc)
 958                                 GOTO(out, rc);
 959                 }
 960                 rc = 0;
 961         }
 962
 963         if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
 964                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
 965                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
 966                         rc = signal_completed_replay(imp);
 967                         if (rc)
 968                                 GOTO(out, rc);
 969                 }
 970
 971         }
 972
 973         if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
 974                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
 975                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 976                 }
 977         }
 978
 979         if (imp->imp_state == LUSTRE_IMP_RECOVER) {
 980                 CDEBUG(D_HA, "reconnected to %s@%s\n",
 981                        obd2cli_tgt(imp->imp_obd),
 982                        imp->imp_connection->c_remote_uuid.uuid);
 983
 984                 rc = ptlrpc_resend(imp);
 985                 if (rc)
 986                         GOTO(out, rc);
 987                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 988                 ptlrpc_activate_import(imp);
 989
 990                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
 991                           &target_start, &target_len);
 992                 LCONSOLE_INFO("%s: Connection restored to service %.*s "
 993                               "using nid %s.\n", imp->imp_obd->obd_name,
 994                               target_len, target_start,
 995                               libcfs_nid2str(imp->imp_connection->c_peer.nid));
 996         }
 997
 998         if (imp->imp_state == LUSTRE_IMP_FULL) {
 999                 cfs_waitq_signal(&imp->imp_recovery_waitq);
1000                 ptlrpc_wake_delayed(imp);
1001         }
1002
1003 out:
1004         RETURN(rc);
1005 }
1006
1007 static int back_to_sleep(void *unused)
1008 {
1009         return 0;
1010 }
1011
1012 int ptlrpc_disconnect_import(struct obd_import *imp, int noclose)
1013 {
1014         struct ptlrpc_request *req;
1015         int rq_opc, rc = 0;
1016         ENTRY;
1017
1018         switch (imp->imp_connect_op) {
1019         case OST_CONNECT: rq_opc = OST_DISCONNECT; break;
1020         case MDS_CONNECT: rq_opc = MDS_DISCONNECT; break;
1021         case MGS_CONNECT: rq_opc = MGS_DISCONNECT; break;
1022         default:
1023                 CERROR("don't know how to disconnect from %s (connect_op %d)\n",
1024                        obd2cli_tgt(imp->imp_obd), imp->imp_connect_op);
1025                 RETURN(-EINVAL);
1026         }
1027
1028         if (ptlrpc_import_in_recovery(imp)) {
1029                 struct l_wait_info lwi;
1030                 cfs_duration_t timeout;
1031                 if (imp->imp_server_timeout)
1032                         timeout = cfs_time_seconds(obd_timeout / 2);
1033                 else
1034                         timeout = cfs_time_seconds(obd_timeout);
1035
1036                 timeout = MAX(timeout * HZ, 1);
1037
1038                 lwi = LWI_TIMEOUT_INTR(cfs_timeout_cap(timeout),
1039                                        back_to_sleep, LWI_ON_SIGNAL_NOOP, NULL);
1040                 rc = l_wait_event(imp->imp_recovery_waitq,
1041                                   !ptlrpc_import_in_recovery(imp), &lwi);
1042
1043         }
1044
1045         spin_lock(&imp->imp_lock);
1046         if (imp->imp_state != LUSTRE_IMP_FULL)
1047                 GOTO(out, 0);
1048
1049         spin_unlock(&imp->imp_lock);
1050
1051         req = ptlrpc_prep_req(imp, LUSTRE_OBD_VERSION, rq_opc, 1, NULL, NULL);
1052         if (req) {
1053                 /* We are disconnecting, do not retry a failed DISCONNECT rpc if
1054                  * it fails.  We can get through the above with a down server
1055                  * if the client doesn't know the server is gone yet. */
1056                 req->rq_no_resend = 1;
1057 #ifdef CRAY_XT3
1058                 req->rq_timeout = obd_timeout / 3;
1059 #else
1060                 req->rq_timeout = 5;
1061 #endif
1062                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
1063                 req->rq_send_state =  LUSTRE_IMP_CONNECTING;
1064                 ptlrpc_req_set_repsize(req, 1, NULL);
1065                 rc = ptlrpc_queue_wait(req);
1066                 ptlrpc_req_finished(req);
1067         }
1068
1069         spin_lock(&imp->imp_lock);
1070 out:
1071         if (noclose)
1072                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
1073         else
1074                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
1075         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
1076         imp->imp_conn_cnt = 0;
1077         imp->imp_last_recon = 0;
1078         spin_unlock(&imp->imp_lock);
1079
1080         RETURN(rc);
1081 }
1082