lustre/ptlrpc/import.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * Copyright (c) 2011 Whamcloud, Inc.
  34  */
  35 /*
  36  * This file is part of Lustre, http://www.lustre.org/
  37  * Lustre is a trademark of Sun Microsystems, Inc.
  38  *
  39  * lustre/ptlrpc/import.c
  40  *
  41  * Author: Mike Shaver <shaver@clusterfs.com>
  42  */
  43
  44 #define DEBUG_SUBSYSTEM S_RPC
  45 #ifndef __KERNEL__
  46 # include <liblustre.h>
  47 #endif
  48
  49 #include <obd_support.h>
  50 #include <lustre_ha.h>
  51 #include <lustre_net.h>
  52 #include <lustre_import.h>
  53 #include <lustre_export.h>
  54 #include <obd.h>
  55 #include <obd_cksum.h>
  56 #include <obd_class.h>
  57
  58 #include "ptlrpc_internal.h"
  59
  60 struct ptlrpc_connect_async_args {
  61          __u64 pcaa_peer_committed;
  62         int pcaa_initial_connect;
  63 };
  64
  65 /**
  66  * Updates import \a imp current state to provided \a state value
  67  * Helper function. Must be called under imp_lock.
  68  */
  69 static void __import_set_state(struct obd_import *imp,
  70                                enum lustre_imp_state state)
  71 {
  72         imp->imp_state = state;
  73         imp->imp_state_hist[imp->imp_state_hist_idx].ish_state = state;
  74         imp->imp_state_hist[imp->imp_state_hist_idx].ish_time =
  75                 cfs_time_current_sec();
  76         imp->imp_state_hist_idx = (imp->imp_state_hist_idx + 1) %
  77                 IMP_STATE_HIST_LEN;
  78 }
  79
  80 /* A CLOSED import should remain so. */
  81 #define IMPORT_SET_STATE_NOLOCK(imp, state)                                    \
  82 do {                                                                           \
  83         if (imp->imp_state != LUSTRE_IMP_CLOSED) {                             \
  84                CDEBUG(D_HA, "%p %s: changing import state from %s to %s\n",    \
  85                       imp, obd2cli_tgt(imp->imp_obd),                          \
  86                       ptlrpc_import_state_name(imp->imp_state),                \
  87                       ptlrpc_import_state_name(state));                        \
  88                __import_set_state(imp, state);                                 \
  89         }                                                                      \
  90 } while(0)
  91
  92 #define IMPORT_SET_STATE(imp, state)            \
  93 do {                                            \
  94         cfs_spin_lock(&imp->imp_lock);          \
  95         IMPORT_SET_STATE_NOLOCK(imp, state);    \
  96         cfs_spin_unlock(&imp->imp_lock);        \
  97 } while(0)
  98
  99
 100 static int ptlrpc_connect_interpret(const struct lu_env *env,
 101                                     struct ptlrpc_request *request,
 102                                     void * data, int rc);
 103 int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
 104
 105 /* Only this function is allowed to change the import state when it is
 106  * CLOSED. I would rather refcount the import and free it after
 107  * disconnection like we do with exports. To do that, the client_obd
 108  * will need to save the peer info somewhere other than in the import,
 109  * though. */
 110 int ptlrpc_init_import(struct obd_import *imp)
 111 {
 112         cfs_spin_lock(&imp->imp_lock);
 113
 114         imp->imp_generation++;
 115         imp->imp_state =  LUSTRE_IMP_NEW;
 116
 117         cfs_spin_unlock(&imp->imp_lock);
 118
 119         return 0;
 120 }
 121 EXPORT_SYMBOL(ptlrpc_init_import);
 122
 123 #define UUID_STR "_UUID"
 124 void deuuidify(char *uuid, const char *prefix, char **uuid_start, int *uuid_len)
 125 {
 126         *uuid_start = !prefix || strncmp(uuid, prefix, strlen(prefix))
 127                 ? uuid : uuid + strlen(prefix);
 128
 129         *uuid_len = strlen(*uuid_start);
 130
 131         if (*uuid_len < strlen(UUID_STR))
 132                 return;
 133
 134         if (!strncmp(*uuid_start + *uuid_len - strlen(UUID_STR),
 135                     UUID_STR, strlen(UUID_STR)))
 136                 *uuid_len -= strlen(UUID_STR);
 137 }
 138 EXPORT_SYMBOL(deuuidify);
 139
 140 /**
 141  * Returns true if import was FULL, false if import was already not
 142  * connected.
 143  * @imp - import to be disconnected
 144  * @conn_cnt - connection count (epoch) of the request that timed out
 145  *             and caused the disconnection.  In some cases, multiple
 146  *             inflight requests can fail to a single target (e.g. OST
 147  *             bulk requests) and if one has already caused a reconnection
 148  *             (increasing the import->conn_cnt) the older failure should
 149  *             not also cause a reconnection.  If zero it forces a reconnect.
 150  */
 151 int ptlrpc_set_import_discon(struct obd_import *imp, __u32 conn_cnt)
 152 {
 153         int rc = 0;
 154
 155         cfs_spin_lock(&imp->imp_lock);
 156
 157         if (imp->imp_state == LUSTRE_IMP_FULL &&
 158             (conn_cnt == 0 || conn_cnt == imp->imp_conn_cnt)) {
 159                 char *target_start;
 160                 int   target_len;
 161
 162                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
 163                           &target_start, &target_len);
 164
 165                 if (imp->imp_replayable) {
 166                         LCONSOLE_WARN("%s: Connection to %.*s (at %s) was "
 167                                "lost; in progress operations using this "
 168                                "service will wait for recovery to complete\n",
 169                                imp->imp_obd->obd_name, target_len, target_start,
 170                                libcfs_nid2str(imp->imp_connection->c_peer.nid));
 171                 } else {
 172                         LCONSOLE_ERROR_MSG(0x166, "%s: Connection to "
 173                                "%.*s (at %s) was lost; in progress "
 174                                "operations using this service will fail\n",
 175                                imp->imp_obd->obd_name,
 176                                target_len, target_start,
 177                                libcfs_nid2str(imp->imp_connection->c_peer.nid));
 178                 }
 179                 ptlrpc_deactivate_timeouts(imp);
 180                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
 181                 cfs_spin_unlock(&imp->imp_lock);
 182
 183                 if (obd_dump_on_timeout)
 184                         libcfs_debug_dumplog();
 185
 186                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
 187                 rc = 1;
 188         } else {
 189                 cfs_spin_unlock(&imp->imp_lock);
 190                 CDEBUG(D_HA, "%s: import %p already %s (conn %u, was %u): %s\n",
 191                        imp->imp_client->cli_name, imp,
 192                        (imp->imp_state == LUSTRE_IMP_FULL &&
 193                         imp->imp_conn_cnt > conn_cnt) ?
 194                        "reconnected" : "not connected", imp->imp_conn_cnt,
 195                        conn_cnt, ptlrpc_import_state_name(imp->imp_state));
 196         }
 197
 198         return rc;
 199 }
 200
 201 /* Must be called with imp_lock held! */
 202 static void ptlrpc_deactivate_and_unlock_import(struct obd_import *imp)
 203 {
 204         ENTRY;
 205         LASSERT_SPIN_LOCKED(&imp->imp_lock);
 206
 207         CDEBUG(D_HA, "setting import %s INVALID\n", obd2cli_tgt(imp->imp_obd));
 208         imp->imp_invalid = 1;
 209         imp->imp_generation++;
 210         cfs_spin_unlock(&imp->imp_lock);
 211
 212         ptlrpc_abort_inflight(imp);
 213         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
 214
 215         EXIT;
 216 }
 217
 218 /*
 219  * This acts as a barrier; all existing requests are rejected, and
 220  * no new requests will be accepted until the import is valid again.
 221  */
 222 void ptlrpc_deactivate_import(struct obd_import *imp)
 223 {
 224         cfs_spin_lock(&imp->imp_lock);
 225         ptlrpc_deactivate_and_unlock_import(imp);
 226 }
 227
 228 static unsigned int
 229 ptlrpc_inflight_deadline(struct ptlrpc_request *req, time_t now)
 230 {
 231         long dl;
 232
 233         if (!(((req->rq_phase == RQ_PHASE_RPC) && !req->rq_waiting) ||
 234               (req->rq_phase == RQ_PHASE_BULK) ||
 235               (req->rq_phase == RQ_PHASE_NEW)))
 236                 return 0;
 237
 238         if (req->rq_timedout)
 239                 return 0;
 240
 241         if (req->rq_phase == RQ_PHASE_NEW)
 242                 dl = req->rq_sent;
 243         else
 244                 dl = req->rq_deadline;
 245
 246         if (dl <= now)
 247                 return 0;
 248
 249         return dl - now;
 250 }
 251
 252 static unsigned int ptlrpc_inflight_timeout(struct obd_import *imp)
 253 {
 254         time_t now = cfs_time_current_sec();
 255         cfs_list_t *tmp, *n;
 256         struct ptlrpc_request *req;
 257         unsigned int timeout = 0;
 258
 259         cfs_spin_lock(&imp->imp_lock);
 260         cfs_list_for_each_safe(tmp, n, &imp->imp_sending_list) {
 261                 req = cfs_list_entry(tmp, struct ptlrpc_request, rq_list);
 262                 timeout = max(ptlrpc_inflight_deadline(req, now), timeout);
 263         }
 264         cfs_spin_unlock(&imp->imp_lock);
 265         return timeout;
 266 }
 267
 268 /**
 269  * This function will invalidate the import, if necessary, then block
 270  * for all the RPC completions, and finally notify the obd to
 271  * invalidate its state (ie cancel locks, clear pending requests,
 272  * etc).
 273  */
 274 void ptlrpc_invalidate_import(struct obd_import *imp)
 275 {
 276         cfs_list_t *tmp, *n;
 277         struct ptlrpc_request *req;
 278         struct l_wait_info lwi;
 279         unsigned int timeout;
 280         int rc;
 281
 282         cfs_atomic_inc(&imp->imp_inval_count);
 283
 284         if (!imp->imp_invalid || imp->imp_obd->obd_no_recov)
 285                 ptlrpc_deactivate_import(imp);
 286
 287         LASSERT(imp->imp_invalid);
 288
 289         /* Wait forever until inflight == 0. We really can't do it another
 290          * way because in some cases we need to wait for very long reply
 291          * unlink. We can't do anything before that because there is really
 292          * no guarantee that some rdma transfer is not in progress right now. */
 293         do {
 294                 /* Calculate max timeout for waiting on rpcs to error
 295                  * out. Use obd_timeout if calculated value is smaller
 296                  * than it. */
 297                 if (!OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK)) {
 298                         timeout = ptlrpc_inflight_timeout(imp);
 299                         timeout += timeout / 3;
 300
 301                         if (timeout == 0)
 302                                 timeout = obd_timeout;
 303                 } else {
 304                         /* decrease the interval to increase race condition */
 305                         timeout = 1;
 306                 }
 307
 308                 CDEBUG(D_RPCTRACE,"Sleeping %d sec for inflight to error out\n",
 309                        timeout);
 310
 311                 /* Wait for all requests to error out and call completion
 312                  * callbacks. Cap it at obd_timeout -- these should all
 313                  * have been locally cancelled by ptlrpc_abort_inflight. */
 314                 lwi = LWI_TIMEOUT_INTERVAL(
 315                         cfs_timeout_cap(cfs_time_seconds(timeout)),
 316                         (timeout > 1)?cfs_time_seconds(1):cfs_time_seconds(1)/2,
 317                         NULL, NULL);
 318                 rc = l_wait_event(imp->imp_recovery_waitq,
 319                                   (cfs_atomic_read(&imp->imp_inflight) == 0),
 320                                   &lwi);
 321                 if (rc) {
 322                         const char *cli_tgt = obd2cli_tgt(imp->imp_obd);
 323
 324                         CERROR("%s: rc = %d waiting for callback (%d != 0)\n",
 325                                cli_tgt, rc,
 326                                cfs_atomic_read(&imp->imp_inflight));
 327
 328                         cfs_spin_lock(&imp->imp_lock);
 329                         if (cfs_atomic_read(&imp->imp_inflight) == 0) {
 330                                 int count = cfs_atomic_read(&imp->imp_unregistering);
 331
 332                                 /* We know that "unregistering" rpcs only can
 333                                  * survive in sending or delaying lists (they
 334                                  * maybe waiting for long reply unlink in
 335                                  * sluggish nets). Let's check this. If there
 336                                  * is no inflight and unregistering != 0, this
 337                                  * is bug. */
 338                                 LASSERTF(count == 0, "Some RPCs are still "
 339                                          "unregistering: %d\n", count);
 340
 341                                 /* Let's save one loop as soon as inflight have
 342                                  * dropped to zero. No new inflights possible at
 343                                  * this point. */
 344                                 rc = 0;
 345                         } else {
 346                                 cfs_list_for_each_safe(tmp, n,
 347                                                        &imp->imp_sending_list) {
 348                                         req = cfs_list_entry(tmp,
 349                                                              struct ptlrpc_request,
 350                                                              rq_list);
 351                                         DEBUG_REQ(D_ERROR, req,
 352                                                   "still on sending list");
 353                                 }
 354                                 cfs_list_for_each_safe(tmp, n,
 355                                                        &imp->imp_delayed_list) {
 356                                         req = cfs_list_entry(tmp,
 357                                                              struct ptlrpc_request,
 358                                                              rq_list);
 359                                         DEBUG_REQ(D_ERROR, req,
 360                                                   "still on delayed list");
 361                                 }
 362
 363                                 CERROR("%s: RPCs in \"%s\" phase found (%d). "
 364                                        "Network is sluggish? Waiting them "
 365                                        "to error out.\n", cli_tgt,
 366                                        ptlrpc_phase2str(RQ_PHASE_UNREGISTERING),
 367                                        cfs_atomic_read(&imp->
 368                                                        imp_unregistering));
 369                         }
 370                         cfs_spin_unlock(&imp->imp_lock);
 371                   }
 372         } while (rc != 0);
 373
 374         /*
 375          * Let's additionally check that no new rpcs added to import in
 376          * "invalidate" state.
 377          */
 378         LASSERT(cfs_atomic_read(&imp->imp_inflight) == 0);
 379         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
 380         sptlrpc_import_flush_all_ctx(imp);
 381
 382         cfs_atomic_dec(&imp->imp_inval_count);
 383         cfs_waitq_broadcast(&imp->imp_recovery_waitq);
 384 }
 385
 386 /* unset imp_invalid */
 387 void ptlrpc_activate_import(struct obd_import *imp)
 388 {
 389         struct obd_device *obd = imp->imp_obd;
 390
 391         cfs_spin_lock(&imp->imp_lock);
 392         imp->imp_invalid = 0;
 393         ptlrpc_activate_timeouts(imp);
 394         cfs_spin_unlock(&imp->imp_lock);
 395         obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
 396 }
 397
 398 void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt)
 399 {
 400         ENTRY;
 401
 402         LASSERT(!imp->imp_dlm_fake);
 403
 404         if (ptlrpc_set_import_discon(imp, conn_cnt)) {
 405                 if (!imp->imp_replayable) {
 406                         CDEBUG(D_HA, "import %s@%s for %s not replayable, "
 407                                "auto-deactivating\n",
 408                                obd2cli_tgt(imp->imp_obd),
 409                                imp->imp_connection->c_remote_uuid.uuid,
 410                                imp->imp_obd->obd_name);
 411                         ptlrpc_deactivate_import(imp);
 412                 }
 413
 414                 CDEBUG(D_HA, "%s: waking up pinger\n",
 415                        obd2cli_tgt(imp->imp_obd));
 416
 417                 cfs_spin_lock(&imp->imp_lock);
 418                 imp->imp_force_verify = 1;
 419                 cfs_spin_unlock(&imp->imp_lock);
 420
 421                 ptlrpc_pinger_wake_up();
 422         }
 423         EXIT;
 424 }
 425
 426 int ptlrpc_reconnect_import(struct obd_import *imp)
 427 {
 428         ptlrpc_set_import_discon(imp, 0);
 429         /* Force a new connect attempt */
 430         ptlrpc_invalidate_import(imp);
 431         /* Do a fresh connect next time by zeroing the handle */
 432         ptlrpc_disconnect_import(imp, 1);
 433         /* Wait for all invalidate calls to finish */
 434         if (cfs_atomic_read(&imp->imp_inval_count) > 0) {
 435                 int rc;
 436                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
 437                 rc = l_wait_event(imp->imp_recovery_waitq,
 438                                   (cfs_atomic_read(&imp->imp_inval_count) == 0),
 439                                   &lwi);
 440                 if (rc)
 441                         CERROR("Interrupted, inval=%d\n",
 442                                cfs_atomic_read(&imp->imp_inval_count));
 443         }
 444
 445         /* Allow reconnect attempts */
 446         imp->imp_obd->obd_no_recov = 0;
 447         /* Remove 'invalid' flag */
 448         ptlrpc_activate_import(imp);
 449         /* Attempt a new connect */
 450         ptlrpc_recover_import(imp, NULL);
 451         return 0;
 452 }
 453
 454 EXPORT_SYMBOL(ptlrpc_reconnect_import);
 455
 456 /**
 457  * Connection on import \a imp is changed to another one (if more than one is
 458  * present). We typically chose connection that we have not tried to connect to
 459  * the longest
 460  */
 461 static int import_select_connection(struct obd_import *imp)
 462 {
 463         struct obd_import_conn *imp_conn = NULL, *conn;
 464         struct obd_export *dlmexp;
 465         char *target_start;
 466         int target_len, tried_all = 1;
 467         ENTRY;
 468
 469         cfs_spin_lock(&imp->imp_lock);
 470
 471         if (cfs_list_empty(&imp->imp_conn_list)) {
 472                 CERROR("%s: no connections available\n",
 473                         imp->imp_obd->obd_name);
 474                 cfs_spin_unlock(&imp->imp_lock);
 475                 RETURN(-EINVAL);
 476         }
 477
 478         cfs_list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 479                 CDEBUG(D_HA, "%s: connect to NID %s last attempt "LPU64"\n",
 480                        imp->imp_obd->obd_name,
 481                        libcfs_nid2str(conn->oic_conn->c_peer.nid),
 482                        conn->oic_last_attempt);
 483
 484                 /* If we have not tried this connection since
 485                    the last successful attempt, go with this one */
 486                 if ((conn->oic_last_attempt == 0) ||
 487                     cfs_time_beforeq_64(conn->oic_last_attempt,
 488                                        imp->imp_last_success_conn)) {
 489                         imp_conn = conn;
 490                         tried_all = 0;
 491                         break;
 492                 }
 493
 494                 /* If all of the connections have already been tried
 495                    since the last successful connection; just choose the
 496                    least recently used */
 497                 if (!imp_conn)
 498                         imp_conn = conn;
 499                 else if (cfs_time_before_64(conn->oic_last_attempt,
 500                                             imp_conn->oic_last_attempt))
 501                         imp_conn = conn;
 502         }
 503
 504         /* if not found, simply choose the current one */
 505         if (!imp_conn || imp->imp_force_reconnect) {
 506                 LASSERT(imp->imp_conn_current);
 507                 imp_conn = imp->imp_conn_current;
 508                 tried_all = 0;
 509         }
 510         LASSERT(imp_conn->oic_conn);
 511
 512         /* If we've tried everything, and we're back to the beginning of the
 513            list, increase our timeout and try again. It will be reset when
 514            we do finally connect. (FIXME: really we should wait for all network
 515            state associated with the last connection attempt to drain before
 516            trying to reconnect on it.) */
 517         if (tried_all && (imp->imp_conn_list.next == &imp_conn->oic_item)) {
 518                 if (at_get(&imp->imp_at.iat_net_latency) <
 519                     CONNECTION_SWITCH_MAX) {
 520                         at_measured(&imp->imp_at.iat_net_latency,
 521                                     at_get(&imp->imp_at.iat_net_latency) +
 522                                     CONNECTION_SWITCH_INC);
 523                 }
 524                 LASSERT(imp_conn->oic_last_attempt);
 525                 CDEBUG(D_HA, "%s: tried all connections, increasing latency "
 526                        "to %ds\n", imp->imp_obd->obd_name,
 527                        at_get(&imp->imp_at.iat_net_latency));
 528         }
 529
 530         imp_conn->oic_last_attempt = cfs_time_current_64();
 531
 532         /* switch connection, don't mind if it's same as the current one */
 533         if (imp->imp_connection)
 534                 ptlrpc_connection_put(imp->imp_connection);
 535         imp->imp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 536
 537         dlmexp =  class_conn2export(&imp->imp_dlm_handle);
 538         LASSERT(dlmexp != NULL);
 539         if (dlmexp->exp_connection)
 540                 ptlrpc_connection_put(dlmexp->exp_connection);
 541         dlmexp->exp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 542         class_export_put(dlmexp);
 543
 544         if (imp->imp_conn_current != imp_conn) {
 545                 if (imp->imp_conn_current) {
 546                         deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
 547                                   &target_start, &target_len);
 548
 549                         CDEBUG(D_HA, "%s: Connection changing to"
 550                                " %.*s (at %s)\n",
 551                                imp->imp_obd->obd_name,
 552                                target_len, target_start,
 553                                libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
 554                 }
 555
 556                 imp->imp_conn_current = imp_conn;
 557         }
 558
 559         CDEBUG(D_HA, "%s: import %p using connection %s/%s\n",
 560                imp->imp_obd->obd_name, imp, imp_conn->oic_uuid.uuid,
 561                libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
 562
 563         cfs_spin_unlock(&imp->imp_lock);
 564
 565         RETURN(0);
 566 }
 567
 568 /*
 569  * must be called under imp_lock
 570  */
 571 static int ptlrpc_first_transno(struct obd_import *imp, __u64 *transno)
 572 {
 573         struct ptlrpc_request *req;
 574         cfs_list_t *tmp;
 575
 576         if (cfs_list_empty(&imp->imp_replay_list))
 577                 return 0;
 578         tmp = imp->imp_replay_list.next;
 579         req = cfs_list_entry(tmp, struct ptlrpc_request, rq_replay_list);
 580         *transno = req->rq_transno;
 581         if (req->rq_transno == 0) {
 582                 DEBUG_REQ(D_ERROR, req, "zero transno in replay");
 583                 LBUG();
 584         }
 585
 586         return 1;
 587 }
 588
 589 /**
 590  * Attempt to (re)connect import \a imp. This includes all preparations,
 591  * initializing CONNECT RPC request and passing it to ptlrpcd for
 592  * actual sending.
 593  * Returns 0 on success or error code.
 594  */
 595 int ptlrpc_connect_import(struct obd_import *imp, char *new_uuid)
 596 {
 597         struct obd_device *obd = imp->imp_obd;
 598         int initial_connect = 0;
 599         int set_transno = 0;
 600         __u64 committed_before_reconnect = 0;
 601         struct ptlrpc_request *request;
 602         char *bufs[] = { NULL,
 603                          obd2cli_tgt(imp->imp_obd),
 604                          obd->obd_uuid.uuid,
 605                          (char *)&imp->imp_dlm_handle,
 606                          (char *)&imp->imp_connect_data };
 607         struct ptlrpc_connect_async_args *aa;
 608         int rc;
 609         ENTRY;
 610
 611         cfs_spin_lock(&imp->imp_lock);
 612         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 613                 cfs_spin_unlock(&imp->imp_lock);
 614                 CERROR("can't connect to a closed import\n");
 615                 RETURN(-EINVAL);
 616         } else if (imp->imp_state == LUSTRE_IMP_FULL) {
 617                 cfs_spin_unlock(&imp->imp_lock);
 618                 CERROR("already connected\n");
 619                 RETURN(0);
 620         } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
 621                 cfs_spin_unlock(&imp->imp_lock);
 622                 CERROR("already connecting\n");
 623                 RETURN(-EALREADY);
 624         }
 625
 626         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
 627
 628         imp->imp_conn_cnt++;
 629         imp->imp_resend_replay = 0;
 630
 631         if (!lustre_handle_is_used(&imp->imp_remote_handle))
 632                 initial_connect = 1;
 633         else
 634                 committed_before_reconnect = imp->imp_peer_committed_transno;
 635
 636         set_transno = ptlrpc_first_transno(imp,
 637                                            &imp->imp_connect_data.ocd_transno);
 638         cfs_spin_unlock(&imp->imp_lock);
 639
 640         if (new_uuid) {
 641                 struct obd_uuid uuid;
 642
 643                 obd_str2uuid(&uuid, new_uuid);
 644                 rc = import_set_conn_priority(imp, &uuid);
 645                 if (rc)
 646                         GOTO(out, rc);
 647         }
 648
 649         rc = import_select_connection(imp);
 650         if (rc)
 651                 GOTO(out, rc);
 652
 653         rc = sptlrpc_import_sec_adapt(imp, NULL, 0);
 654         if (rc)
 655                 GOTO(out, rc);
 656
 657         /* Reset connect flags to the originally requested flags, in case
 658          * the server is updated on-the-fly we will get the new features. */
 659         imp->imp_connect_data.ocd_connect_flags = imp->imp_connect_flags_orig;
 660         imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 661         imp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
 662
 663         rc = obd_reconnect(NULL, imp->imp_obd->obd_self_export, obd,
 664                            &obd->obd_uuid, &imp->imp_connect_data, NULL);
 665         if (rc)
 666                 GOTO(out, rc);
 667
 668         request = ptlrpc_request_alloc(imp, &RQF_MDS_CONNECT);
 669         if (request == NULL)
 670                 GOTO(out, rc = -ENOMEM);
 671
 672         rc = ptlrpc_request_bufs_pack(request, LUSTRE_OBD_VERSION,
 673                                       imp->imp_connect_op, bufs, NULL);
 674         if (rc) {
 675                 ptlrpc_request_free(request);
 676                 GOTO(out, rc);
 677         }
 678
 679         /* Report the rpc service time to the server so that it knows how long
 680          * to wait for clients to join recovery */
 681         lustre_msg_set_service_time(request->rq_reqmsg,
 682                                     at_timeout2est(request->rq_timeout));
 683
 684         /* The amount of time we give the server to process the connect req.
 685          * import_select_connection will increase the net latency on
 686          * repeated reconnect attempts to cover slow networks.
 687          * We override/ignore the server rpc completion estimate here,
 688          * which may be large if this is a reconnect attempt */
 689         request->rq_timeout = INITIAL_CONNECT_TIMEOUT;
 690         lustre_msg_set_timeout(request->rq_reqmsg, request->rq_timeout);
 691
 692 #ifndef __KERNEL__
 693         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_LIBCLIENT);
 694 #endif
 695         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_NEXT_VER);
 696
 697         request->rq_no_resend = request->rq_no_delay = 1;
 698         request->rq_send_state = LUSTRE_IMP_CONNECTING;
 699         /* Allow a slightly larger reply for future growth compatibility */
 700         req_capsule_set_size(&request->rq_pill, &RMF_CONNECT_DATA, RCL_SERVER,
 701                              sizeof(struct obd_connect_data)+16*sizeof(__u64));
 702         ptlrpc_request_set_replen(request);
 703         request->rq_interpret_reply = ptlrpc_connect_interpret;
 704
 705         CLASSERT(sizeof (*aa) <= sizeof (request->rq_async_args));
 706         aa = ptlrpc_req_async_args(request);
 707         memset(aa, 0, sizeof *aa);
 708
 709         aa->pcaa_peer_committed = committed_before_reconnect;
 710         aa->pcaa_initial_connect = initial_connect;
 711
 712         if (aa->pcaa_initial_connect) {
 713                 cfs_spin_lock(&imp->imp_lock);
 714                 imp->imp_replayable = 1;
 715                 cfs_spin_unlock(&imp->imp_lock);
 716                 lustre_msg_add_op_flags(request->rq_reqmsg,
 717                                         MSG_CONNECT_INITIAL);
 718         }
 719
 720         if (set_transno)
 721                 lustre_msg_add_op_flags(request->rq_reqmsg,
 722                                         MSG_CONNECT_TRANSNO);
 723
 724         DEBUG_REQ(D_RPCTRACE, request, "(re)connect request (timeout %d)",
 725                   request->rq_timeout);
 726         ptlrpcd_add_req(request, PSCOPE_OTHER);
 727         rc = 0;
 728 out:
 729         if (rc != 0) {
 730                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 731         }
 732
 733         RETURN(rc);
 734 }
 735 EXPORT_SYMBOL(ptlrpc_connect_import);
 736
 737 static void ptlrpc_maybe_ping_import_soon(struct obd_import *imp)
 738 {
 739 #ifdef __KERNEL__
 740         /* the pinger takes care of issuing the next reconnect request */
 741         return;
 742 #else
 743         /* liblustre has no pinger thread, so we wakeup pinger anyway */
 744         ptlrpc_pinger_wake_up();
 745 #endif
 746 }
 747
 748 static int ptlrpc_busy_reconnect(int rc)
 749 {
 750         return (rc == -EBUSY) || (rc == -EAGAIN);
 751 }
 752
 753 /**
 754  * interpret_reply callback for connect RPCs.
 755  * Looks into returned status of connect operation and decides
 756  * what to do with the import - i.e enter recovery, promote it to
 757  * full state for normal operations of disconnect it due to an error.
 758  */
 759 static int ptlrpc_connect_interpret(const struct lu_env *env,
 760                                     struct ptlrpc_request *request,
 761                                     void *data, int rc)
 762 {
 763         struct ptlrpc_connect_async_args *aa = data;
 764         struct obd_import *imp = request->rq_import;
 765         struct client_obd *cli = &imp->imp_obd->u.cli;
 766         struct lustre_handle old_hdl;
 767         __u64 old_connect_flags;
 768         int msg_flags;
 769         ENTRY;
 770
 771         cfs_spin_lock(&imp->imp_lock);
 772         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 773                 cfs_spin_unlock(&imp->imp_lock);
 774                 RETURN(0);
 775         }
 776
 777         if (rc) {
 778                 /* if this reconnect to busy export - not need select new target
 779                  * for connecting*/
 780                 imp->imp_force_reconnect = ptlrpc_busy_reconnect(rc);
 781                 cfs_spin_unlock(&imp->imp_lock);
 782                 GOTO(out, rc);
 783         }
 784
 785         LASSERT(imp->imp_conn_current);
 786
 787         msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
 788
 789         /* All imports are pingable */
 790         imp->imp_pingable = 1;
 791         imp->imp_force_reconnect = 0;
 792
 793         if (aa->pcaa_initial_connect) {
 794                 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
 795                         imp->imp_replayable = 1;
 796                         cfs_spin_unlock(&imp->imp_lock);
 797                         CDEBUG(D_HA, "connected to replayable target: %s\n",
 798                                obd2cli_tgt(imp->imp_obd));
 799                 } else {
 800                         imp->imp_replayable = 0;
 801                         cfs_spin_unlock(&imp->imp_lock);
 802                 }
 803
 804                 /* if applies, adjust the imp->imp_msg_magic here
 805                  * according to reply flags */
 806
 807                 imp->imp_remote_handle =
 808                                 *lustre_msg_get_handle(request->rq_repmsg);
 809
 810                 /* Initial connects are allowed for clients with non-random
 811                  * uuids when servers are in recovery.  Simply signal the
 812                  * servers replay is complete and wait in REPLAY_WAIT. */
 813                 if (msg_flags & MSG_CONNECT_RECOVERING) {
 814                         CDEBUG(D_HA, "connect to %s during recovery\n",
 815                                obd2cli_tgt(imp->imp_obd));
 816                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
 817                 } else {
 818                         IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 819                         ptlrpc_activate_import(imp);
 820                 }
 821
 822                 GOTO(finish, rc = 0);
 823         } else {
 824                 cfs_spin_unlock(&imp->imp_lock);
 825         }
 826
 827         /* Determine what recovery state to move the import to. */
 828         if (MSG_CONNECT_RECONNECT & msg_flags) {
 829                 memset(&old_hdl, 0, sizeof(old_hdl));
 830                 if (!memcmp(&old_hdl, lustre_msg_get_handle(request->rq_repmsg),
 831                             sizeof (old_hdl))) {
 832                         LCONSOLE_WARN("Reconnect to %s (at @%s) failed due "
 833                                       "bad handle "LPX64"\n",
 834                                       obd2cli_tgt(imp->imp_obd),
 835                                       imp->imp_connection->c_remote_uuid.uuid,
 836                                       imp->imp_dlm_handle.cookie);
 837                         GOTO(out, rc = -ENOTCONN);
 838                 }
 839
 840                 if (memcmp(&imp->imp_remote_handle,
 841                            lustre_msg_get_handle(request->rq_repmsg),
 842                            sizeof(imp->imp_remote_handle))) {
 843                         int level = msg_flags & MSG_CONNECT_RECOVERING ?
 844                                 D_HA : D_WARNING;
 845
 846                         /* Bug 16611/14775: if server handle have changed,
 847                          * that means some sort of disconnection happened.
 848                          * If the server is not in recovery, that also means it
 849                          * already erased all of our state because of previous
 850                          * eviction. If it is in recovery - we are safe to
 851                          * participate since we can reestablish all of our state
 852                          * with server again */
 853                         if ((MSG_CONNECT_RECOVERING & msg_flags)) {
 854                                 CDEBUG(level,"%s@%s changed server handle from "
 855                                        LPX64" to "LPX64
 856                                        " but is still in recovery\n",
 857                                        obd2cli_tgt(imp->imp_obd),
 858                                        imp->imp_connection->c_remote_uuid.uuid,
 859                                        imp->imp_remote_handle.cookie,
 860                                        lustre_msg_get_handle(
 861                                        request->rq_repmsg)->cookie);
 862                         } else {
 863                                 LCONSOLE_WARN("Evicted from %s (at %s) "
 864                                               "after server handle changed from "
 865                                               LPX64" to "LPX64"\n",
 866                                               obd2cli_tgt(imp->imp_obd),
 867                                               imp->imp_connection-> \
 868                                               c_remote_uuid.uuid,
 869                                               imp->imp_remote_handle.cookie,
 870                                               lustre_msg_get_handle(
 871                                               request->rq_repmsg)->cookie);
 872                         }
 873
 874
 875                         imp->imp_remote_handle =
 876                                      *lustre_msg_get_handle(request->rq_repmsg);
 877
 878                         if (!(MSG_CONNECT_RECOVERING & msg_flags)) {
 879                                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 880                                 GOTO(finish, rc = 0);
 881                         }
 882
 883                 } else {
 884                         CDEBUG(D_HA, "reconnected to %s@%s after partition\n",
 885                                obd2cli_tgt(imp->imp_obd),
 886                                imp->imp_connection->c_remote_uuid.uuid);
 887                 }
 888
 889                 if (imp->imp_invalid) {
 890                         CDEBUG(D_HA, "%s: reconnected but import is invalid; "
 891                                "marking evicted\n", imp->imp_obd->obd_name);
 892                         IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 893                 } else if (MSG_CONNECT_RECOVERING & msg_flags) {
 894                         CDEBUG(D_HA, "%s: reconnected to %s during replay\n",
 895                                imp->imp_obd->obd_name,
 896                                obd2cli_tgt(imp->imp_obd));
 897
 898                         cfs_spin_lock(&imp->imp_lock);
 899                         imp->imp_resend_replay = 1;
 900                         cfs_spin_unlock(&imp->imp_lock);
 901
 902                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 903                 } else {
 904                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 905                 }
 906         } else if ((MSG_CONNECT_RECOVERING & msg_flags) && !imp->imp_invalid) {
 907                 LASSERT(imp->imp_replayable);
 908                 imp->imp_remote_handle =
 909                                 *lustre_msg_get_handle(request->rq_repmsg);
 910                 imp->imp_last_replay_transno = 0;
 911                 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 912         } else {
 913                 DEBUG_REQ(D_HA, request, "%s: evicting (reconnect/recover flags"
 914                           " not set: %x)", imp->imp_obd->obd_name, msg_flags);
 915                 imp->imp_remote_handle =
 916                                 *lustre_msg_get_handle(request->rq_repmsg);
 917                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 918         }
 919
 920         /* Sanity checks for a reconnected import. */
 921         if (!(imp->imp_replayable) != !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
 922                 CERROR("imp_replayable flag does not match server "
 923                        "after reconnect. We should LBUG right here.\n");
 924         }
 925
 926         if (lustre_msg_get_last_committed(request->rq_repmsg) > 0 &&
 927             lustre_msg_get_last_committed(request->rq_repmsg) <
 928             aa->pcaa_peer_committed) {
 929                 CERROR("%s went back in time (transno "LPD64
 930                        " was previously committed, server now claims "LPD64
 931                        ")!  See https://bugzilla.lustre.org/show_bug.cgi?"
 932                        "id=9646\n",
 933                        obd2cli_tgt(imp->imp_obd), aa->pcaa_peer_committed,
 934                        lustre_msg_get_last_committed(request->rq_repmsg));
 935         }
 936
 937 finish:
 938         rc = ptlrpc_import_recovery_state_machine(imp);
 939         if (rc != 0) {
 940                 if (rc == -ENOTCONN) {
 941                         CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
 942                                "invalidating and reconnecting\n",
 943                                obd2cli_tgt(imp->imp_obd),
 944                                imp->imp_connection->c_remote_uuid.uuid);
 945                         ptlrpc_connect_import(imp, NULL);
 946                         RETURN(0);
 947                 }
 948         } else {
 949                 struct obd_connect_data *ocd;
 950                 struct obd_export *exp;
 951                 int ret;
 952                 ret = req_capsule_get_size(&request->rq_pill, &RMF_CONNECT_DATA,
 953                                            RCL_SERVER);
 954                 /* server replied obd_connect_data is always bigger */
 955                 ocd = req_capsule_server_sized_get(&request->rq_pill,
 956                                                    &RMF_CONNECT_DATA, ret);
 957
 958                 cfs_spin_lock(&imp->imp_lock);
 959                 cfs_list_del(&imp->imp_conn_current->oic_item);
 960                 cfs_list_add(&imp->imp_conn_current->oic_item,
 961                              &imp->imp_conn_list);
 962                 imp->imp_last_success_conn =
 963                         imp->imp_conn_current->oic_last_attempt;
 964
 965                 if (ocd == NULL) {
 966                         cfs_spin_unlock(&imp->imp_lock);
 967                         CERROR("Wrong connect data from server\n");
 968                         rc = -EPROTO;
 969                         GOTO(out, rc);
 970                 }
 971
 972                 imp->imp_connect_data = *ocd;
 973
 974                 exp = class_conn2export(&imp->imp_dlm_handle);
 975                 cfs_spin_unlock(&imp->imp_lock);
 976
 977                 /* check that server granted subset of flags we asked for. */
 978                 LASSERTF((ocd->ocd_connect_flags &
 979                           imp->imp_connect_flags_orig) ==
 980                          ocd->ocd_connect_flags, LPX64" != "LPX64,
 981                          imp->imp_connect_flags_orig, ocd->ocd_connect_flags);
 982
 983                 if (!exp) {
 984                         /* This could happen if export is cleaned during the
 985                            connect attempt */
 986                         CERROR("Missing export for %s\n",
 987                                imp->imp_obd->obd_name);
 988                         GOTO(out, rc = -ENODEV);
 989                 }
 990                 old_connect_flags = exp->exp_connect_flags;
 991                 exp->exp_connect_flags = ocd->ocd_connect_flags;
 992                 imp->imp_obd->obd_self_export->exp_connect_flags =
 993                                                         ocd->ocd_connect_flags;
 994                 class_export_put(exp);
 995
 996                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_OCD);
 997
 998                 if (!ocd->ocd_ibits_known &&
 999                     ocd->ocd_connect_flags & OBD_CONNECT_IBITS)
1000                         CERROR("Inodebits aware server returned zero compatible"
1001                                " bits?\n");
1002
1003                 if ((ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
1004                     (ocd->ocd_version > LUSTRE_VERSION_CODE +
1005                                         LUSTRE_VERSION_OFFSET_WARN ||
1006                      ocd->ocd_version < LUSTRE_VERSION_CODE -
1007                                         LUSTRE_VERSION_OFFSET_WARN)) {
1008                         /* Sigh, some compilers do not like #ifdef in the middle
1009                            of macro arguments */
1010 #ifdef __KERNEL__
1011                         const char *older = "older. Consider upgrading server "
1012                                             "or downgrading client";
1013 #else
1014                         const char *older = "older. Consider recompiling this "
1015                                             "application";
1016 #endif
1017                         const char *newer = "newer than client version. "
1018                                             "Consider upgrading client";
1019
1020                         LCONSOLE_WARN("Server %s version (%d.%d.%d.%d) "
1021                                       "is much %s (%s)\n",
1022                                       obd2cli_tgt(imp->imp_obd),
1023                                       OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
1024                                       OBD_OCD_VERSION_MINOR(ocd->ocd_version),
1025                                       OBD_OCD_VERSION_PATCH(ocd->ocd_version),
1026                                       OBD_OCD_VERSION_FIX(ocd->ocd_version),
1027                                       ocd->ocd_version > LUSTRE_VERSION_CODE ?
1028                                       newer : older, LUSTRE_VERSION_STRING);
1029                 }
1030
1031                 if (ocd->ocd_connect_flags & OBD_CONNECT_CKSUM) {
1032                         /* We sent to the server ocd_cksum_types with bits set
1033                          * for algorithms we understand. The server masked off
1034                          * the checksum types it doesn't support */
1035                         if ((ocd->ocd_cksum_types & OBD_CKSUM_ALL) == 0) {
1036                                 LCONSOLE_WARN("The negotiation of the checksum "
1037                                               "alogrithm to use with server %s "
1038                                               "failed (%x/%x), disabling "
1039                                               "checksums\n",
1040                                               obd2cli_tgt(imp->imp_obd),
1041                                               ocd->ocd_cksum_types,
1042                                               OBD_CKSUM_ALL);
1043                                 cli->cl_checksum = 0;
1044                                 cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
1045                                 cli->cl_cksum_type = OBD_CKSUM_CRC32;
1046                         } else {
1047                                 cli->cl_supp_cksum_types = ocd->ocd_cksum_types;
1048
1049                                 if (ocd->ocd_cksum_types & OSC_DEFAULT_CKSUM)
1050                                         cli->cl_cksum_type = OSC_DEFAULT_CKSUM;
1051                                 else if (ocd->ocd_cksum_types & OBD_CKSUM_ADLER)
1052                                         cli->cl_cksum_type = OBD_CKSUM_ADLER;
1053                                 else
1054                                         cli->cl_cksum_type = OBD_CKSUM_CRC32;
1055                         }
1056                 } else {
1057                         /* The server does not support OBD_CONNECT_CKSUM.
1058                          * Enforce CRC32 for backward compatibility*/
1059                         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
1060                         cli->cl_cksum_type = OBD_CKSUM_CRC32;
1061                 }
1062
1063                 if (ocd->ocd_connect_flags & OBD_CONNECT_BRW_SIZE)
1064                         cli->cl_max_pages_per_rpc =
1065                                 ocd->ocd_brw_size >> CFS_PAGE_SHIFT;
1066                 else if (imp->imp_connect_op == MDS_CONNECT ||
1067                          imp->imp_connect_op == MGS_CONNECT)
1068                         cli->cl_max_pages_per_rpc = 1;
1069
1070                 /* Reset ns_connect_flags only for initial connect. It might be
1071                  * changed in while using FS and if we reset it in reconnect
1072                  * this leads to losing user settings done before such as
1073                  * disable lru_resize, etc. */
1074                 if (old_connect_flags != exp->exp_connect_flags ||
1075                     aa->pcaa_initial_connect) {
1076                         CDEBUG(D_HA, "%s: Resetting ns_connect_flags to server "
1077                                "flags: "LPX64"\n", imp->imp_obd->obd_name,
1078                               ocd->ocd_connect_flags);
1079                         imp->imp_obd->obd_namespace->ns_connect_flags =
1080                                 ocd->ocd_connect_flags;
1081                         imp->imp_obd->obd_namespace->ns_orig_connect_flags =
1082                                 ocd->ocd_connect_flags;
1083                 }
1084
1085                 if ((ocd->ocd_connect_flags & OBD_CONNECT_AT) &&
1086                     (imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
1087                         /* We need a per-message support flag, because
1088                            a. we don't know if the incoming connect reply
1089                               supports AT or not (in reply_in_callback)
1090                               until we unpack it.
1091                            b. failovered server means export and flags are gone
1092                               (in ptlrpc_send_reply).
1093                            Can only be set when we know AT is supported at
1094                            both ends */
1095                         imp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1096                 else
1097                         imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1098
1099                 if ((ocd->ocd_connect_flags & OBD_CONNECT_FULL20) &&
1100                     (imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
1101                         imp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
1102                 else
1103                         imp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
1104
1105                 LASSERT((cli->cl_max_pages_per_rpc <= PTLRPC_MAX_BRW_PAGES) &&
1106                         (cli->cl_max_pages_per_rpc > 0));
1107         }
1108
1109 out:
1110         if (rc != 0) {
1111                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
1112                 if (rc == -EACCES) {
1113                         /*
1114                          * Give up trying to reconnect
1115                          * EACCES means client has no permission for connection
1116                          */
1117                         imp->imp_obd->obd_no_recov = 1;
1118                         ptlrpc_deactivate_import(imp);
1119                 }
1120
1121                 if (rc == -EPROTO) {
1122                         struct obd_connect_data *ocd;
1123
1124                         /* reply message might not be ready */
1125                         if (request->rq_repmsg == NULL)
1126                                 RETURN(-EPROTO);
1127
1128                         ocd = req_capsule_server_get(&request->rq_pill,
1129                                                      &RMF_CONNECT_DATA);
1130                         if (ocd &&
1131                             (ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
1132                             (ocd->ocd_version != LUSTRE_VERSION_CODE)) {
1133                            /* Actually servers are only supposed to refuse
1134                               connection from liblustre clients, so we should
1135                               never see this from VFS context */
1136                                 LCONSOLE_ERROR_MSG(0x16a, "Server %s version "
1137                                         "(%d.%d.%d.%d)"
1138                                         " refused connection from this client "
1139                                         "with an incompatible version (%s).  "
1140                                         "Client must be recompiled\n",
1141                                         obd2cli_tgt(imp->imp_obd),
1142                                         OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
1143                                         OBD_OCD_VERSION_MINOR(ocd->ocd_version),
1144                                         OBD_OCD_VERSION_PATCH(ocd->ocd_version),
1145                                         OBD_OCD_VERSION_FIX(ocd->ocd_version),
1146                                         LUSTRE_VERSION_STRING);
1147                                 ptlrpc_deactivate_import(imp);
1148                                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CLOSED);
1149                         }
1150                         RETURN(-EPROTO);
1151                 }
1152
1153                 ptlrpc_maybe_ping_import_soon(imp);
1154
1155                 CDEBUG(D_HA, "recovery of %s on %s failed (%d)\n",
1156                        obd2cli_tgt(imp->imp_obd),
1157                        (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
1158         }
1159
1160         cfs_waitq_broadcast(&imp->imp_recovery_waitq);
1161         RETURN(rc);
1162 }
1163
1164 /**
1165  * interpret callback for "completed replay" RPCs.
1166  * \see signal_completed_replay
1167  */
1168 static int completed_replay_interpret(const struct lu_env *env,
1169                                       struct ptlrpc_request *req,
1170                                       void * data, int rc)
1171 {
1172         ENTRY;
1173         cfs_atomic_dec(&req->rq_import->imp_replay_inflight);
1174         if (req->rq_status == 0 &&
1175             !req->rq_import->imp_vbr_failed) {
1176                 ptlrpc_import_recovery_state_machine(req->rq_import);
1177         } else {
1178                 if (req->rq_import->imp_vbr_failed) {
1179                         CDEBUG(D_WARNING,
1180                                "%s: version recovery fails, reconnecting\n",
1181                                req->rq_import->imp_obd->obd_name);
1182                 } else {
1183                         CDEBUG(D_HA, "%s: LAST_REPLAY message error: %d, "
1184                                      "reconnecting\n",
1185                                req->rq_import->imp_obd->obd_name,
1186                                req->rq_status);
1187                 }
1188                 ptlrpc_connect_import(req->rq_import, NULL);
1189         }
1190
1191         RETURN(0);
1192 }
1193
1194 /**
1195  * Let server know that we have no requests to replay anymore.
1196  * Achieved by just sending a PING request
1197  */
1198 static int signal_completed_replay(struct obd_import *imp)
1199 {
1200         struct ptlrpc_request *req;
1201         ENTRY;
1202
1203         if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_FINISH_REPLAY)))
1204                 RETURN(0);
1205
1206         LASSERT(cfs_atomic_read(&imp->imp_replay_inflight) == 0);
1207         cfs_atomic_inc(&imp->imp_replay_inflight);
1208
1209         req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING, LUSTRE_OBD_VERSION,
1210                                         OBD_PING);
1211         if (req == NULL) {
1212                 cfs_atomic_dec(&imp->imp_replay_inflight);
1213                 RETURN(-ENOMEM);
1214         }
1215
1216         ptlrpc_request_set_replen(req);
1217         req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
1218         lustre_msg_add_flags(req->rq_reqmsg,
1219                              MSG_LOCK_REPLAY_DONE | MSG_REQ_REPLAY_DONE);
1220         if (AT_OFF)
1221                 req->rq_timeout *= 3;
1222         req->rq_interpret_reply = completed_replay_interpret;
1223
1224         ptlrpcd_add_req(req, PSCOPE_OTHER);
1225         RETURN(0);
1226 }
1227
1228 #ifdef __KERNEL__
1229 /**
1230  * In kernel code all import invalidation happens in its own
1231  * separate thread, so that whatever application happened to encounter
1232  * a problem could still be killed or otherwise continue
1233  */
1234 static int ptlrpc_invalidate_import_thread(void *data)
1235 {
1236         struct obd_import *imp = data;
1237
1238         ENTRY;
1239
1240         cfs_daemonize_ctxt("ll_imp_inval");
1241
1242         CDEBUG(D_HA, "thread invalidate import %s to %s@%s\n",
1243                imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
1244                imp->imp_connection->c_remote_uuid.uuid);
1245
1246         ptlrpc_invalidate_import(imp);
1247
1248         if (obd_dump_on_eviction) {
1249                 CERROR("dump the log upon eviction\n");
1250                 libcfs_debug_dumplog();
1251         }
1252
1253         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1254         ptlrpc_import_recovery_state_machine(imp);
1255
1256         class_import_put(imp);
1257         RETURN(0);
1258 }
1259 #endif
1260
1261 /**
1262  * This is the state machine for client-side recovery on import.
1263  *
1264  * Typicaly we have two possibly paths. If we came to server and it is not
1265  * in recovery, we just enter IMP_EVICTED state, invalidate our import
1266  * state and reconnect from scratch.
1267  * If we came to server that is in recovery, we enter IMP_REPLAY import state.
1268  * We go through our list of requests to replay and send them to server one by
1269  * one.
1270  * After sending all request from the list we change import state to
1271  * IMP_REPLAY_LOCKS and re-request all the locks we believe we have from server
1272  * and also all the locks we don't yet have and wait for server to grant us.
1273  * After that we send a special "replay completed" request and change import
1274  * state to IMP_REPLAY_WAIT.
1275  * Upon receiving reply to that "replay completed" RPC we enter IMP_RECOVER
1276  * state and resend all requests from sending list.
1277  * After that we promote import to FULL state and send all delayed requests
1278  * and import is fully operational after that.
1279  *
1280  */
1281 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
1282 {
1283         int rc = 0;
1284         int inflight;
1285         char *target_start;
1286         int target_len;
1287
1288         ENTRY;
1289         if (imp->imp_state == LUSTRE_IMP_EVICTED) {
1290                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1291                           &target_start, &target_len);
1292                 /* Don't care about MGC eviction */
1293                 if (strcmp(imp->imp_obd->obd_type->typ_name,
1294                            LUSTRE_MGC_NAME) != 0) {
1295                         LCONSOLE_ERROR_MSG(0x167, "This client was evicted by "
1296                                            "%.*s; in progress operations using "
1297                                            "this service will fail.\n",
1298                                            target_len, target_start);
1299                 }
1300                 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
1301                        obd2cli_tgt(imp->imp_obd),
1302                        imp->imp_connection->c_remote_uuid.uuid);
1303                 /* reset vbr_failed flag upon eviction */
1304                 cfs_spin_lock(&imp->imp_lock);
1305                 imp->imp_vbr_failed = 0;
1306                 cfs_spin_unlock(&imp->imp_lock);
1307
1308 #ifdef __KERNEL__
1309                 /* bug 17802:  XXX client_disconnect_export vs connect request
1310                  * race. if client will evicted at this time, we start
1311                  * invalidate thread without reference to import and import can
1312                  * be freed at same time. */
1313                 class_import_get(imp);
1314                 rc = cfs_create_thread(ptlrpc_invalidate_import_thread, imp,
1315                                        CFS_DAEMON_FLAGS);
1316                 if (rc < 0) {
1317                         class_import_put(imp);
1318                         CERROR("error starting invalidate thread: %d\n", rc);
1319                 } else {
1320                         rc = 0;
1321                 }
1322                 RETURN(rc);
1323 #else
1324                 ptlrpc_invalidate_import(imp);
1325
1326                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1327 #endif
1328         }
1329
1330         if (imp->imp_state == LUSTRE_IMP_REPLAY) {
1331                 CDEBUG(D_HA, "replay requested by %s\n",
1332                        obd2cli_tgt(imp->imp_obd));
1333                 rc = ptlrpc_replay_next(imp, &inflight);
1334                 if (inflight == 0 &&
1335                     cfs_atomic_read(&imp->imp_replay_inflight) == 0) {
1336                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
1337                         rc = ldlm_replay_locks(imp);
1338                         if (rc)
1339                                 GOTO(out, rc);
1340                 }
1341                 rc = 0;
1342         }
1343
1344         if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
1345                 if (cfs_atomic_read(&imp->imp_replay_inflight) == 0) {
1346                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
1347                         rc = signal_completed_replay(imp);
1348                         if (rc)
1349                                 GOTO(out, rc);
1350                 }
1351
1352         }
1353
1354         if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
1355                 if (cfs_atomic_read(&imp->imp_replay_inflight) == 0) {
1356                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1357                 }
1358         }
1359
1360         if (imp->imp_state == LUSTRE_IMP_RECOVER) {
1361                 CDEBUG(D_HA, "reconnected to %s@%s\n",
1362                        obd2cli_tgt(imp->imp_obd),
1363                        imp->imp_connection->c_remote_uuid.uuid);
1364
1365                 rc = ptlrpc_resend(imp);
1366                 if (rc)
1367                         GOTO(out, rc);
1368                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
1369                 ptlrpc_activate_import(imp);
1370
1371                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1372                           &target_start, &target_len);
1373                 LCONSOLE_INFO("%s: Connection restored to %.*s (at %s)\n",
1374                               imp->imp_obd->obd_name,
1375                               target_len, target_start,
1376                               libcfs_nid2str(imp->imp_connection->c_peer.nid));
1377         }
1378
1379         if (imp->imp_state == LUSTRE_IMP_FULL) {
1380                 cfs_waitq_broadcast(&imp->imp_recovery_waitq);
1381                 ptlrpc_wake_delayed(imp);
1382         }
1383
1384 out:
1385         RETURN(rc);
1386 }
1387
1388 int ptlrpc_disconnect_import(struct obd_import *imp, int noclose)
1389 {
1390         struct ptlrpc_request *req;
1391         int rq_opc, rc = 0;
1392         int nowait = imp->imp_obd->obd_force;
1393         ENTRY;
1394
1395         if (nowait)
1396                 GOTO(set_state, rc);
1397
1398         switch (imp->imp_connect_op) {
1399         case OST_CONNECT: rq_opc = OST_DISCONNECT; break;
1400         case MDS_CONNECT: rq_opc = MDS_DISCONNECT; break;
1401         case MGS_CONNECT: rq_opc = MGS_DISCONNECT; break;
1402         default:
1403                 CERROR("don't know how to disconnect from %s (connect_op %d)\n",
1404                        obd2cli_tgt(imp->imp_obd), imp->imp_connect_op);
1405                 RETURN(-EINVAL);
1406         }
1407
1408         if (ptlrpc_import_in_recovery(imp)) {
1409                 struct l_wait_info lwi;
1410                 cfs_duration_t timeout;
1411
1412
1413                 if (AT_OFF) {
1414                         if (imp->imp_server_timeout)
1415                                 timeout = cfs_time_seconds(obd_timeout / 2);
1416                         else
1417                                 timeout = cfs_time_seconds(obd_timeout);
1418                 } else {
1419                         int idx = import_at_get_index(imp,
1420                                 imp->imp_client->cli_request_portal);
1421                         timeout = cfs_time_seconds(
1422                                 at_get(&imp->imp_at.iat_service_estimate[idx]));
1423                 }
1424
1425                 lwi = LWI_TIMEOUT_INTR(cfs_timeout_cap(timeout),
1426                                        back_to_sleep, LWI_ON_SIGNAL_NOOP, NULL);
1427                 rc = l_wait_event(imp->imp_recovery_waitq,
1428                                   !ptlrpc_import_in_recovery(imp), &lwi);
1429
1430         }
1431
1432         cfs_spin_lock(&imp->imp_lock);
1433         if (imp->imp_state != LUSTRE_IMP_FULL)
1434                 GOTO(out, 0);
1435
1436         cfs_spin_unlock(&imp->imp_lock);
1437
1438         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_DISCONNECT,
1439                                         LUSTRE_OBD_VERSION, rq_opc);
1440         if (req) {
1441                 /* We are disconnecting, do not retry a failed DISCONNECT rpc if
1442                  * it fails.  We can get through the above with a down server
1443                  * if the client doesn't know the server is gone yet. */
1444                 req->rq_no_resend = 1;
1445
1446 #ifndef CRAY_XT3
1447                 /* We want client umounts to happen quickly, no matter the
1448                    server state... */
1449                 req->rq_timeout = min_t(int, req->rq_timeout,
1450                                         INITIAL_CONNECT_TIMEOUT);
1451 #else
1452                 /* ... but we always want liblustre clients to nicely
1453                    disconnect, so only use the adaptive value. */
1454                 if (AT_OFF)
1455                         req->rq_timeout = obd_timeout / 3;
1456 #endif
1457
1458                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
1459                 req->rq_send_state =  LUSTRE_IMP_CONNECTING;
1460                 ptlrpc_request_set_replen(req);
1461                 rc = ptlrpc_queue_wait(req);
1462                 ptlrpc_req_finished(req);
1463         }
1464
1465 set_state:
1466         cfs_spin_lock(&imp->imp_lock);
1467 out:
1468         if (noclose)
1469                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
1470         else
1471                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
1472         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
1473         cfs_spin_unlock(&imp->imp_lock);
1474
1475         RETURN(rc);
1476 }
1477
1478 void ptlrpc_cleanup_imp(struct obd_import *imp)
1479 {
1480         ENTRY;
1481
1482         cfs_spin_lock(&imp->imp_lock);
1483         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
1484         imp->imp_generation++;
1485         cfs_spin_unlock(&imp->imp_lock);
1486         ptlrpc_abort_inflight(imp);
1487
1488         EXIT;
1489 }
1490
1491 /* Adaptive Timeout utils */
1492 extern unsigned int at_min, at_max, at_history;
1493
1494 /* Bin into timeslices using AT_BINS bins.
1495    This gives us a max of the last binlimit*AT_BINS secs without the storage,
1496    but still smoothing out a return to normalcy from a slow response.
1497    (E.g. remember the maximum latency in each minute of the last 4 minutes.) */
1498 int at_measured(struct adaptive_timeout *at, unsigned int val)
1499 {
1500         unsigned int old = at->at_current;
1501         time_t now = cfs_time_current_sec();
1502         time_t binlimit = max_t(time_t, at_history / AT_BINS, 1);
1503
1504         LASSERT(at);
1505         CDEBUG(D_OTHER, "add %u to %p time=%lu v=%u (%u %u %u %u)\n",
1506                val, at, now - at->at_binstart, at->at_current,
1507                at->at_hist[0], at->at_hist[1], at->at_hist[2], at->at_hist[3]);
1508
1509         if (val == 0)
1510                 /* 0's don't count, because we never want our timeout to
1511                    drop to 0, and because 0 could mean an error */
1512                 return 0;
1513
1514         cfs_spin_lock(&at->at_lock);
1515
1516         if (unlikely(at->at_binstart == 0)) {
1517                 /* Special case to remove default from history */
1518                 at->at_current = val;
1519                 at->at_worst_ever = val;
1520                 at->at_worst_time = now;
1521                 at->at_hist[0] = val;
1522                 at->at_binstart = now;
1523         } else if (now - at->at_binstart < binlimit ) {
1524                 /* in bin 0 */
1525                 at->at_hist[0] = max(val, at->at_hist[0]);
1526                 at->at_current = max(val, at->at_current);
1527         } else {
1528                 int i, shift;
1529                 unsigned int maxv = val;
1530                 /* move bins over */
1531                 shift = (now - at->at_binstart) / binlimit;
1532                 LASSERT(shift > 0);
1533                 for(i = AT_BINS - 1; i >= 0; i--) {
1534                         if (i >= shift) {
1535                                 at->at_hist[i] = at->at_hist[i - shift];
1536                                 maxv = max(maxv, at->at_hist[i]);
1537                         } else {
1538                                 at->at_hist[i] = 0;
1539                         }
1540                 }
1541                 at->at_hist[0] = val;
1542                 at->at_current = maxv;
1543                 at->at_binstart += shift * binlimit;
1544         }
1545
1546         if (at->at_current > at->at_worst_ever) {
1547                 at->at_worst_ever = at->at_current;
1548                 at->at_worst_time = now;
1549         }
1550
1551         if (at->at_flags & AT_FLG_NOHIST)
1552                 /* Only keep last reported val; keeping the rest of the history
1553                    for proc only */
1554                 at->at_current = val;
1555
1556         if (at_max > 0)
1557                 at->at_current =  min(at->at_current, at_max);
1558         at->at_current =  max(at->at_current, at_min);
1559
1560         if (at->at_current != old)
1561                 CDEBUG(D_OTHER, "AT %p change: old=%u new=%u delta=%d "
1562                        "(val=%u) hist %u %u %u %u\n", at,
1563                        old, at->at_current, at->at_current - old, val,
1564                        at->at_hist[0], at->at_hist[1], at->at_hist[2],
1565                        at->at_hist[3]);
1566
1567         /* if we changed, report the old value */
1568         old = (at->at_current != old) ? old : 0;
1569
1570         cfs_spin_unlock(&at->at_lock);
1571         return old;
1572 }
1573
1574 /* Find the imp_at index for a given portal; assign if space available */
1575 int import_at_get_index(struct obd_import *imp, int portal)
1576 {
1577         struct imp_at *at = &imp->imp_at;
1578         int i;
1579
1580         for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1581                 if (at->iat_portal[i] == portal)
1582                         return i;
1583                 if (at->iat_portal[i] == 0)
1584                         /* unused */
1585                         break;
1586         }
1587
1588         /* Not found in list, add it under a lock */
1589         cfs_spin_lock(&imp->imp_lock);
1590
1591         /* Check unused under lock */
1592         for (; i < IMP_AT_MAX_PORTALS; i++) {
1593                 if (at->iat_portal[i] == portal)
1594                         goto out;
1595                 if (at->iat_portal[i] == 0)
1596                         /* unused */
1597                         break;
1598         }
1599
1600         /* Not enough portals? */
1601         LASSERT(i < IMP_AT_MAX_PORTALS);
1602
1603         at->iat_portal[i] = portal;
1604 out:
1605         cfs_spin_unlock(&imp->imp_lock);
1606         return i;
1607 }