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  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/ptlrpc/import.c
  37  *
  38  * Author: Mike Shaver <shaver@clusterfs.com>
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_RPC
  42 #ifndef __KERNEL__
  43 # include <liblustre.h>
  44 #endif
  45
  46 #include <obd_support.h>
  47 #include <lustre_ha.h>
  48 #include <lustre_net.h>
  49 #include <lustre_import.h>
  50 #include <lustre_export.h>
  51 #include <obd.h>
  52 #include <obd_cksum.h>
  53 #include <obd_class.h>
  54
  55 #include "ptlrpc_internal.h"
  56
  57 struct ptlrpc_connect_async_args {
  58          __u64 pcaa_peer_committed;
  59         int pcaa_initial_connect;
  60 };
  61
  62 /* A CLOSED import should remain so. */
  63 #define IMPORT_SET_STATE_NOLOCK(imp, state)                                    \
  64 do {                                                                           \
  65         if (imp->imp_state != LUSTRE_IMP_CLOSED) {                             \
  66                CDEBUG(D_HA, "%p %s: changing import state from %s to %s\n",    \
  67                       imp, obd2cli_tgt(imp->imp_obd),                          \
  68                       ptlrpc_import_state_name(imp->imp_state),                \
  69                       ptlrpc_import_state_name(state));                        \
  70                imp->imp_state = state;                                         \
  71         }                                                                      \
  72 } while(0)
  73
  74 #define IMPORT_SET_STATE(imp, state)            \
  75 do {                                            \
  76         spin_lock(&imp->imp_lock);              \
  77         IMPORT_SET_STATE_NOLOCK(imp, state);    \
  78         spin_unlock(&imp->imp_lock);            \
  79 } while(0)
  80
  81
  82 static int ptlrpc_connect_interpret(const struct lu_env *env,
  83                                     struct ptlrpc_request *request,
  84                                     void * data, int rc);
  85 int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
  86
  87 /* Only this function is allowed to change the import state when it is
  88  * CLOSED. I would rather refcount the import and free it after
  89  * disconnection like we do with exports. To do that, the client_obd
  90  * will need to save the peer info somewhere other than in the import,
  91  * though. */
  92 int ptlrpc_init_import(struct obd_import *imp)
  93 {
  94         spin_lock(&imp->imp_lock);
  95
  96         imp->imp_generation++;
  97         imp->imp_state =  LUSTRE_IMP_NEW;
  98
  99         spin_unlock(&imp->imp_lock);
 100
 101         return 0;
 102 }
 103 EXPORT_SYMBOL(ptlrpc_init_import);
 104
 105 #define UUID_STR "_UUID"
 106 static void deuuidify(char *uuid, const char *prefix, char **uuid_start,
 107                       int *uuid_len)
 108 {
 109         *uuid_start = !prefix || strncmp(uuid, prefix, strlen(prefix))
 110                 ? uuid : uuid + strlen(prefix);
 111
 112         *uuid_len = strlen(*uuid_start);
 113
 114         if (*uuid_len < strlen(UUID_STR))
 115                 return;
 116
 117         if (!strncmp(*uuid_start + *uuid_len - strlen(UUID_STR),
 118                     UUID_STR, strlen(UUID_STR)))
 119                 *uuid_len -= strlen(UUID_STR);
 120 }
 121
 122 /* Returns true if import was FULL, false if import was already not
 123  * connected.
 124  * @imp - import to be disconnected
 125  * @conn_cnt - connection count (epoch) of the request that timed out
 126  *             and caused the disconnection.  In some cases, multiple
 127  *             inflight requests can fail to a single target (e.g. OST
 128  *             bulk requests) and if one has already caused a reconnection
 129  *             (increasing the import->conn_cnt) the older failure should
 130  *             not also cause a reconnection.  If zero it forces a reconnect.
 131  */
 132 int ptlrpc_set_import_discon(struct obd_import *imp, __u32 conn_cnt)
 133 {
 134         int rc = 0;
 135
 136         spin_lock(&imp->imp_lock);
 137
 138         if (imp->imp_state == LUSTRE_IMP_FULL &&
 139             (conn_cnt == 0 || conn_cnt == imp->imp_conn_cnt)) {
 140                 char *target_start;
 141                 int   target_len;
 142
 143                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
 144                           &target_start, &target_len);
 145
 146                 if (imp->imp_replayable) {
 147                         LCONSOLE_WARN("%s: Connection to service %.*s via nid "
 148                                "%s was lost; in progress operations using this "
 149                                "service will wait for recovery to complete.\n",
 150                                imp->imp_obd->obd_name, target_len, target_start,
 151                                libcfs_nid2str(imp->imp_connection->c_peer.nid));
 152                 } else {
 153                         LCONSOLE_ERROR_MSG(0x166, "%s: Connection to service "
 154                                "%.*s via nid %s was lost; in progress "
 155                                "operations using this service will fail.\n",
 156                                imp->imp_obd->obd_name,
 157                                target_len, target_start,
 158                                libcfs_nid2str(imp->imp_connection->c_peer.nid));
 159                 }
 160                 ptlrpc_deactivate_timeouts(imp);
 161                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
 162                 spin_unlock(&imp->imp_lock);
 163
 164                 if (obd_dump_on_timeout)
 165                         libcfs_debug_dumplog();
 166
 167                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
 168                 rc = 1;
 169         } else {
 170                 spin_unlock(&imp->imp_lock);
 171                 CDEBUG(D_HA, "%s: import %p already %s (conn %u, was %u): %s\n",
 172                        imp->imp_client->cli_name, imp,
 173                        (imp->imp_state == LUSTRE_IMP_FULL &&
 174                         imp->imp_conn_cnt > conn_cnt) ?
 175                        "reconnected" : "not connected", imp->imp_conn_cnt,
 176                        conn_cnt, ptlrpc_import_state_name(imp->imp_state));
 177         }
 178
 179         return rc;
 180 }
 181
 182 /* Must be called with imp_lock held! */
 183 static void ptlrpc_deactivate_and_unlock_import(struct obd_import *imp)
 184 {
 185         ENTRY;
 186         LASSERT_SPIN_LOCKED(&imp->imp_lock);
 187
 188         CDEBUG(D_HA, "setting import %s INVALID\n", obd2cli_tgt(imp->imp_obd));
 189         imp->imp_invalid = 1;
 190         imp->imp_generation++;
 191         spin_unlock(&imp->imp_lock);
 192
 193         ptlrpc_abort_inflight(imp);
 194         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
 195
 196         EXIT;
 197 }
 198
 199 /*
 200  * This acts as a barrier; all existing requests are rejected, and
 201  * no new requests will be accepted until the import is valid again.
 202  */
 203 void ptlrpc_deactivate_import(struct obd_import *imp)
 204 {
 205         spin_lock(&imp->imp_lock);
 206         ptlrpc_deactivate_and_unlock_import(imp);
 207 }
 208
 209 static unsigned int
 210 ptlrpc_inflight_deadline(struct ptlrpc_request *req, time_t now)
 211 {
 212         long dl;
 213
 214         if (!(((req->rq_phase == RQ_PHASE_RPC) && !req->rq_waiting) ||
 215               (req->rq_phase == RQ_PHASE_BULK) ||
 216               (req->rq_phase == RQ_PHASE_NEW)))
 217                 return 0;
 218
 219         if (req->rq_timedout)
 220                 return 0;
 221
 222         if (req->rq_phase == RQ_PHASE_NEW)
 223                 dl = req->rq_sent;
 224         else
 225                 dl = req->rq_deadline;
 226
 227         if (dl <= now)
 228                 return 0;
 229
 230         return dl - now;
 231 }
 232
 233 static unsigned int ptlrpc_inflight_timeout(struct obd_import *imp)
 234 {
 235         time_t now = cfs_time_current_sec();
 236         struct list_head *tmp, *n;
 237         struct ptlrpc_request *req;
 238         unsigned int timeout = 0;
 239
 240         spin_lock(&imp->imp_lock);
 241         list_for_each_safe(tmp, n, &imp->imp_sending_list) {
 242                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 243                 timeout = max(ptlrpc_inflight_deadline(req, now), timeout);
 244         }
 245         spin_unlock(&imp->imp_lock);
 246         return timeout;
 247 }
 248
 249 /*
 250  * This function will invalidate the import, if necessary, then block
 251  * for all the RPC completions, and finally notify the obd to
 252  * invalidate its state (ie cancel locks, clear pending requests,
 253  * etc).
 254  */
 255 void ptlrpc_invalidate_import(struct obd_import *imp)
 256 {
 257         struct list_head *tmp, *n;
 258         struct ptlrpc_request *req;
 259         struct l_wait_info lwi;
 260         unsigned int timeout;
 261         int rc;
 262
 263         atomic_inc(&imp->imp_inval_count);
 264
 265         /*
 266          * If this is an invalid MGC connection, then don't bother
 267          * waiting for imp_inflight to drop to 0.
 268          */
 269         if (imp->imp_invalid && imp->imp_recon_bk &&!imp->imp_obd->obd_no_recov)
 270                 goto out;
 271
 272         if (!imp->imp_invalid || imp->imp_obd->obd_no_recov)
 273                 ptlrpc_deactivate_import(imp);
 274
 275         LASSERT(imp->imp_invalid);
 276
 277         /* Wait forever until inflight == 0. We really can't do it another
 278          * way because in some cases we need to wait for very long reply
 279          * unlink. We can't do anything before that because there is really
 280          * no guarantee that some rdma transfer is not in progress right now. */
 281         do {
 282                 /* Calculate max timeout for waiting on rpcs to error
 283                  * out. Use obd_timeout if calculated value is smaller
 284                  * than it. */
 285                 timeout = ptlrpc_inflight_timeout(imp);
 286                 timeout += timeout / 3;
 287
 288                 if (timeout == 0)
 289                         timeout = obd_timeout;
 290
 291                 CDEBUG(D_RPCTRACE,"Sleeping %d sec for inflight to error out\n",
 292                        timeout);
 293
 294                 /* Wait for all requests to error out and call completion
 295                  * callbacks. Cap it at obd_timeout -- these should all
 296                  * have been locally cancelled by ptlrpc_abort_inflight. */
 297                 lwi = LWI_TIMEOUT_INTERVAL(
 298                         cfs_timeout_cap(cfs_time_seconds(timeout)),
 299                         cfs_time_seconds(1), NULL, NULL);
 300                 rc = l_wait_event(imp->imp_recovery_waitq,
 301                                 (atomic_read(&imp->imp_inflight) == 0), &lwi);
 302                 if (rc) {
 303                         const char *cli_tgt = obd2cli_tgt(imp->imp_obd);
 304
 305                         CERROR("%s: rc = %d waiting for callback (%d != 0)\n",
 306                                cli_tgt, rc, atomic_read(&imp->imp_inflight));
 307
 308                         spin_lock(&imp->imp_lock);
 309                         list_for_each_safe(tmp, n, &imp->imp_sending_list) {
 310                                 req = list_entry(tmp, struct ptlrpc_request,
 311                                                  rq_list);
 312                                 DEBUG_REQ(D_ERROR, req,"still on sending list");
 313                         }
 314                         list_for_each_safe(tmp, n, &imp->imp_delayed_list) {
 315                                 req = list_entry(tmp, struct ptlrpc_request,
 316                                                  rq_list);
 317                                 DEBUG_REQ(D_ERROR, req,"still on delayed list");
 318                         }
 319
 320                         if (atomic_read(&imp->imp_unregistering) == 0) {
 321                                 /* We know that only "unregistering" rpcs may
 322                                  * still survive in sending or delaying lists
 323                                  * (They are waiting for long reply unlink in
 324                                  * sluggish nets). Let's check this. If there
 325                                  * is no unregistering and inflight != 0 this
 326                                  * is bug. */
 327                                 LASSERT(atomic_read(&imp->imp_inflight) == 0);
 328
 329                                 /* Let's save one loop as soon as inflight have
 330                                  * dropped to zero. No new inflights possible at
 331                                  * this point. */
 332                                 rc = 0;
 333                         } else {
 334                                 CERROR("%s: RPCs in \"%s\" phase found (%d). "
 335                                        "Network is sluggish? Waiting them "
 336                                        "to error out.\n", cli_tgt,
 337                                        ptlrpc_phase2str(RQ_PHASE_UNREGISTERING),
 338                                        atomic_read(&imp->imp_unregistering));
 339                         }
 340                         spin_unlock(&imp->imp_lock);
 341                   }
 342         } while (rc != 0);
 343
 344         /*
 345          * Let's additionally check that no new rpcs added to import in
 346          * "invalidate" state.
 347          */
 348         LASSERT(atomic_read(&imp->imp_inflight) == 0);
 349 out:
 350         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
 351         sptlrpc_import_flush_all_ctx(imp);
 352
 353         atomic_dec(&imp->imp_inval_count);
 354         cfs_waitq_signal(&imp->imp_recovery_waitq);
 355 }
 356
 357 /* unset imp_invalid */
 358 void ptlrpc_activate_import(struct obd_import *imp)
 359 {
 360         struct obd_device *obd = imp->imp_obd;
 361
 362         spin_lock(&imp->imp_lock);
 363         imp->imp_invalid = 0;
 364         ptlrpc_activate_timeouts(imp);
 365         spin_unlock(&imp->imp_lock);
 366         obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
 367 }
 368
 369 void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt)
 370 {
 371         ENTRY;
 372
 373         LASSERT(!imp->imp_dlm_fake);
 374
 375         if (ptlrpc_set_import_discon(imp, conn_cnt)) {
 376                 if (!imp->imp_replayable) {
 377                         CDEBUG(D_HA, "import %s@%s for %s not replayable, "
 378                                "auto-deactivating\n",
 379                                obd2cli_tgt(imp->imp_obd),
 380                                imp->imp_connection->c_remote_uuid.uuid,
 381                                imp->imp_obd->obd_name);
 382                         ptlrpc_deactivate_import(imp);
 383                 }
 384
 385                 CDEBUG(D_HA, "%s: waking up pinger\n",
 386                        obd2cli_tgt(imp->imp_obd));
 387
 388                 spin_lock(&imp->imp_lock);
 389                 imp->imp_force_verify = 1;
 390                 spin_unlock(&imp->imp_lock);
 391
 392                 ptlrpc_pinger_wake_up();
 393         }
 394         EXIT;
 395 }
 396
 397 int ptlrpc_reconnect_import(struct obd_import *imp)
 398 {
 399         ptlrpc_set_import_discon(imp, 0);
 400         /* Force a new connect attempt */
 401         ptlrpc_invalidate_import(imp);
 402         /* Do a fresh connect next time by zeroing the handle */
 403         ptlrpc_disconnect_import(imp, 1);
 404         /* Wait for all invalidate calls to finish */
 405         if (atomic_read(&imp->imp_inval_count) > 0) {
 406                 int rc;
 407                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
 408                 rc = l_wait_event(imp->imp_recovery_waitq,
 409                                   (atomic_read(&imp->imp_inval_count) == 0),
 410                                   &lwi);
 411                 if (rc)
 412                         CERROR("Interrupted, inval=%d\n",
 413                                atomic_read(&imp->imp_inval_count));
 414         }
 415
 416         /* Allow reconnect attempts */
 417         imp->imp_obd->obd_no_recov = 0;
 418         /* Remove 'invalid' flag */
 419         ptlrpc_activate_import(imp);
 420         /* Attempt a new connect */
 421         ptlrpc_recover_import(imp, NULL);
 422         return 0;
 423 }
 424
 425 EXPORT_SYMBOL(ptlrpc_reconnect_import);
 426
 427 static int import_select_connection(struct obd_import *imp)
 428 {
 429         struct obd_import_conn *imp_conn = NULL, *conn;
 430         struct obd_export *dlmexp;
 431         int tried_all = 1;
 432         ENTRY;
 433
 434         spin_lock(&imp->imp_lock);
 435
 436         if (list_empty(&imp->imp_conn_list)) {
 437                 CERROR("%s: no connections available\n",
 438                         imp->imp_obd->obd_name);
 439                 spin_unlock(&imp->imp_lock);
 440                 RETURN(-EINVAL);
 441         }
 442
 443         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 444                 CDEBUG(D_HA, "%s: connect to NID %s last attempt "LPU64"\n",
 445                        imp->imp_obd->obd_name,
 446                        libcfs_nid2str(conn->oic_conn->c_peer.nid),
 447                        conn->oic_last_attempt);
 448                 /* Don't thrash connections */
 449                 if (cfs_time_before_64(cfs_time_current_64(),
 450                                      conn->oic_last_attempt +
 451                                      cfs_time_seconds(CONNECTION_SWITCH_MIN))) {
 452                         continue;
 453                 }
 454
 455                 /* If we have not tried this connection since the
 456                    the last successful attempt, go with this one */
 457                 if ((conn->oic_last_attempt == 0) ||
 458                     cfs_time_beforeq_64(conn->oic_last_attempt,
 459                                        imp->imp_last_success_conn)) {
 460                         imp_conn = conn;
 461                         tried_all = 0;
 462                         break;
 463                 }
 464
 465                 /* If all of the connections have already been tried
 466                    since the last successful connection; just choose the
 467                    least recently used */
 468                 if (!imp_conn)
 469                         imp_conn = conn;
 470                 else if (cfs_time_before_64(conn->oic_last_attempt,
 471                                             imp_conn->oic_last_attempt))
 472                         imp_conn = conn;
 473         }
 474
 475         /* if not found, simply choose the current one */
 476         if (!imp_conn) {
 477                 LASSERT(imp->imp_conn_current);
 478                 imp_conn = imp->imp_conn_current;
 479                 tried_all = 0;
 480         }
 481         LASSERT(imp_conn->oic_conn);
 482
 483         /* If we've tried everything, and we're back to the beginning of the
 484            list, increase our timeout and try again. It will be reset when
 485            we do finally connect. (FIXME: really we should wait for all network
 486            state associated with the last connection attempt to drain before
 487            trying to reconnect on it.) */
 488         if (tried_all && (imp->imp_conn_list.next == &imp_conn->oic_item) &&
 489             !imp->imp_recon_bk /* not retrying */) {
 490                 if (at_get(&imp->imp_at.iat_net_latency) <
 491                     CONNECTION_SWITCH_MAX) {
 492                         at_add(&imp->imp_at.iat_net_latency,
 493                                at_get(&imp->imp_at.iat_net_latency) +
 494                                CONNECTION_SWITCH_INC);
 495                 }
 496                 LASSERT(imp_conn->oic_last_attempt);
 497                 CWARN("%s: tried all connections, increasing latency to %ds\n",
 498                       imp->imp_obd->obd_name,
 499                       at_get(&imp->imp_at.iat_net_latency));
 500         }
 501
 502         imp_conn->oic_last_attempt = cfs_time_current_64();
 503
 504         /* switch connection, don't mind if it's same as the current one */
 505         if (imp->imp_connection)
 506                 ptlrpc_connection_put(imp->imp_connection);
 507         imp->imp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 508
 509         dlmexp =  class_conn2export(&imp->imp_dlm_handle);
 510         LASSERT(dlmexp != NULL);
 511         if (dlmexp->exp_connection)
 512                 ptlrpc_connection_put(dlmexp->exp_connection);
 513         dlmexp->exp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 514         class_export_put(dlmexp);
 515
 516         if (imp->imp_conn_current != imp_conn) {
 517                 if (imp->imp_conn_current)
 518                         LCONSOLE_INFO("Changing connection for %s to %s/%s\n",
 519                                       imp->imp_obd->obd_name,
 520                                       imp_conn->oic_uuid.uuid,
 521                                       libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
 522                 imp->imp_conn_current = imp_conn;
 523         }
 524
 525         CDEBUG(D_HA, "%s: import %p using connection %s/%s\n",
 526                imp->imp_obd->obd_name, imp, imp_conn->oic_uuid.uuid,
 527                libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
 528
 529         spin_unlock(&imp->imp_lock);
 530
 531         RETURN(0);
 532 }
 533
 534 /*
 535  * must be called under imp_lock
 536  */
 537 static int ptlrpc_first_transno(struct obd_import *imp, __u64 *transno)
 538 {
 539         struct ptlrpc_request *req;
 540         struct list_head *tmp;
 541
 542         if (list_empty(&imp->imp_replay_list))
 543                 return 0;
 544         tmp = imp->imp_replay_list.next;
 545         req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
 546         *transno = req->rq_transno;
 547         if (req->rq_transno == 0) {
 548                 DEBUG_REQ(D_ERROR, req, "zero transno in replay");
 549                 LBUG();
 550         }
 551
 552         return 1;
 553 }
 554
 555 int ptlrpc_connect_import(struct obd_import *imp, char *new_uuid)
 556 {
 557         struct obd_device *obd = imp->imp_obd;
 558         int initial_connect = 0;
 559         int set_transno = 0;
 560         __u64 committed_before_reconnect = 0;
 561         struct ptlrpc_request *request;
 562         char *bufs[] = { NULL,
 563                          obd2cli_tgt(imp->imp_obd),
 564                          obd->obd_uuid.uuid,
 565                          (char *)&imp->imp_dlm_handle,
 566                          (char *)&imp->imp_connect_data };
 567         struct ptlrpc_connect_async_args *aa;
 568         int rc;
 569         ENTRY;
 570
 571         spin_lock(&imp->imp_lock);
 572         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 573                 spin_unlock(&imp->imp_lock);
 574                 CERROR("can't connect to a closed import\n");
 575                 RETURN(-EINVAL);
 576         } else if (imp->imp_state == LUSTRE_IMP_FULL) {
 577                 spin_unlock(&imp->imp_lock);
 578                 CERROR("already connected\n");
 579                 RETURN(0);
 580         } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
 581                 spin_unlock(&imp->imp_lock);
 582                 CERROR("already connecting\n");
 583                 RETURN(-EALREADY);
 584         }
 585
 586         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
 587
 588         imp->imp_conn_cnt++;
 589         imp->imp_resend_replay = 0;
 590
 591         if (!lustre_handle_is_used(&imp->imp_remote_handle))
 592                 initial_connect = 1;
 593         else
 594                 committed_before_reconnect = imp->imp_peer_committed_transno;
 595
 596         set_transno = ptlrpc_first_transno(imp,
 597                                            &imp->imp_connect_data.ocd_transno);
 598         spin_unlock(&imp->imp_lock);
 599
 600         if (new_uuid) {
 601                 struct obd_uuid uuid;
 602
 603                 obd_str2uuid(&uuid, new_uuid);
 604                 rc = import_set_conn_priority(imp, &uuid);
 605                 if (rc)
 606                         GOTO(out, rc);
 607         }
 608
 609         rc = import_select_connection(imp);
 610         if (rc)
 611                 GOTO(out, rc);
 612
 613         /* last in connection list */
 614         if (imp->imp_conn_current->oic_item.next == &imp->imp_conn_list) {
 615                 if (imp->imp_initial_recov_bk && initial_connect) {
 616                         CDEBUG(D_HA, "Last connection attempt (%d) for %s\n",
 617                                imp->imp_conn_cnt, obd2cli_tgt(imp->imp_obd));
 618                         /* Don't retry if connect fails */
 619                         rc = 0;
 620                         obd_set_info_async(obd->obd_self_export,
 621                                            sizeof(KEY_INIT_RECOV),
 622                                            KEY_INIT_RECOV,
 623                                            sizeof(rc), &rc, NULL);
 624                 }
 625                 if (imp->imp_recon_bk) {
 626                         CDEBUG(D_HA, "Last reconnection attempt (%d) for %s\n",
 627                                imp->imp_conn_cnt, obd2cli_tgt(imp->imp_obd));
 628                         spin_lock(&imp->imp_lock);
 629                         imp->imp_last_recon = 1;
 630                         spin_unlock(&imp->imp_lock);
 631                 }
 632         }
 633
 634         rc = sptlrpc_import_sec_adapt(imp, NULL, 0);
 635         if (rc)
 636                 GOTO(out, rc);
 637
 638         /* Reset connect flags to the originally requested flags, in case
 639          * the server is updated on-the-fly we will get the new features. */
 640         imp->imp_connect_data.ocd_connect_flags = imp->imp_connect_flags_orig;
 641         imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 642
 643         rc = obd_reconnect(NULL, imp->imp_obd->obd_self_export, obd,
 644                            &obd->obd_uuid, &imp->imp_connect_data, NULL);
 645         if (rc)
 646                 GOTO(out, rc);
 647
 648         request = ptlrpc_request_alloc(imp, &RQF_MDS_CONNECT);
 649         if (request == NULL)
 650                 GOTO(out, rc = -ENOMEM);
 651
 652         rc = ptlrpc_request_bufs_pack(request, LUSTRE_OBD_VERSION,
 653                                       imp->imp_connect_op, bufs, NULL);
 654         if (rc) {
 655                 ptlrpc_request_free(request);
 656                 GOTO(out, rc);
 657         }
 658
 659         /* Report the rpc service time to the server so that it knows how long
 660          * to wait for clients to join recovery */
 661         lustre_msg_set_service_time(request->rq_reqmsg,
 662                                     at_timeout2est(request->rq_timeout));
 663
 664         /* The amount of time we give the server to process the connect req.
 665          * import_select_connection will increase the net latency on
 666          * repeated reconnect attempts to cover slow networks.
 667          * We override/ignore the server rpc completion estimate here,
 668          * which may be large if this is a reconnect attempt */
 669         request->rq_timeout = INITIAL_CONNECT_TIMEOUT;
 670         lustre_msg_set_timeout(request->rq_reqmsg, request->rq_timeout);
 671
 672 #ifndef __KERNEL__
 673         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_LIBCLIENT);
 674 #endif
 675         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_NEXT_VER);
 676
 677         request->rq_no_resend = request->rq_no_delay = 1;
 678         request->rq_send_state = LUSTRE_IMP_CONNECTING;
 679         /* Allow a slightly larger reply for future growth compatibility */
 680         req_capsule_set_size(&request->rq_pill, &RMF_CONNECT_DATA, RCL_SERVER,
 681                              sizeof(struct obd_connect_data)+16*sizeof(__u64));
 682         ptlrpc_request_set_replen(request);
 683         request->rq_interpret_reply = ptlrpc_connect_interpret;
 684
 685         CLASSERT(sizeof (*aa) <= sizeof (request->rq_async_args));
 686         aa = ptlrpc_req_async_args(request);
 687         memset(aa, 0, sizeof *aa);
 688
 689         aa->pcaa_peer_committed = committed_before_reconnect;
 690         aa->pcaa_initial_connect = initial_connect;
 691
 692         if (aa->pcaa_initial_connect) {
 693                 spin_lock(&imp->imp_lock);
 694                 imp->imp_replayable = 1;
 695                 spin_unlock(&imp->imp_lock);
 696                 lustre_msg_add_op_flags(request->rq_reqmsg,
 697                                         MSG_CONNECT_INITIAL);
 698         }
 699
 700         if (set_transno)
 701                 lustre_msg_add_op_flags(request->rq_reqmsg,
 702                                         MSG_CONNECT_TRANSNO);
 703
 704         DEBUG_REQ(D_RPCTRACE, request, "(re)connect request");
 705         ptlrpcd_add_req(request, PSCOPE_OTHER);
 706         rc = 0;
 707 out:
 708         if (rc != 0) {
 709                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 710         }
 711
 712         RETURN(rc);
 713 }
 714 EXPORT_SYMBOL(ptlrpc_connect_import);
 715
 716 static void ptlrpc_maybe_ping_import_soon(struct obd_import *imp)
 717 {
 718 #ifdef __KERNEL__
 719         struct obd_import_conn *imp_conn;
 720 #endif
 721         int wake_pinger = 0;
 722
 723         ENTRY;
 724
 725         spin_lock(&imp->imp_lock);
 726         if (list_empty(&imp->imp_conn_list))
 727                 GOTO(unlock, 0);
 728
 729 #ifdef __KERNEL__
 730         imp_conn = list_entry(imp->imp_conn_list.prev,
 731                               struct obd_import_conn,
 732                               oic_item);
 733
 734         /* XXX: When the failover node is the primary node, it is possible
 735          * to have two identical connections in imp_conn_list. We must
 736          * compare not conn's pointers but NIDs, otherwise we can defeat
 737          * connection throttling. (See bug 14774.) */
 738         if (imp->imp_conn_current->oic_conn->c_peer.nid !=
 739                                 imp_conn->oic_conn->c_peer.nid) {
 740                 ptlrpc_ping_import_soon(imp);
 741                 wake_pinger = 1;
 742         }
 743 #else
 744         /* liblustre has no pinger thead, so we wakup pinger anyway */
 745         wake_pinger = 1;
 746 #endif
 747
 748  unlock:
 749         spin_unlock(&imp->imp_lock);
 750
 751         if (wake_pinger)
 752                 ptlrpc_pinger_wake_up();
 753
 754         EXIT;
 755 }
 756
 757 static int ptlrpc_connect_interpret(const struct lu_env *env,
 758                                     struct ptlrpc_request *request,
 759                                     void *data, int rc)
 760 {
 761         struct ptlrpc_connect_async_args *aa = data;
 762         struct obd_import *imp = request->rq_import;
 763         struct client_obd *cli = &imp->imp_obd->u.cli;
 764         struct lustre_handle old_hdl;
 765         __u64 old_connect_flags;
 766         int msg_flags;
 767         ENTRY;
 768
 769         spin_lock(&imp->imp_lock);
 770         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 771                 spin_unlock(&imp->imp_lock);
 772                 RETURN(0);
 773         }
 774         spin_unlock(&imp->imp_lock);
 775
 776         if (rc)
 777                 GOTO(out, rc);
 778
 779         LASSERT(imp->imp_conn_current);
 780
 781         msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
 782
 783         /* All imports are pingable */
 784         spin_lock(&imp->imp_lock);
 785         imp->imp_pingable = 1;
 786
 787         if (aa->pcaa_initial_connect) {
 788                 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
 789                         imp->imp_replayable = 1;
 790                         spin_unlock(&imp->imp_lock);
 791                         CDEBUG(D_HA, "connected to replayable target: %s\n",
 792                                obd2cli_tgt(imp->imp_obd));
 793                 } else {
 794                         imp->imp_replayable = 0;
 795                         spin_unlock(&imp->imp_lock);
 796                 }
 797
 798                 /* if applies, adjust the imp->imp_msg_magic here
 799                  * according to reply flags */
 800
 801                 imp->imp_remote_handle =
 802                                 *lustre_msg_get_handle(request->rq_repmsg);
 803
 804                 /* Initial connects are allowed for clients with non-random
 805                  * uuids when servers are in recovery.  Simply signal the
 806                  * servers replay is complete and wait in REPLAY_WAIT. */
 807                 if (msg_flags & MSG_CONNECT_RECOVERING) {
 808                         CDEBUG(D_HA, "connect to %s during recovery\n",
 809                                obd2cli_tgt(imp->imp_obd));
 810                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
 811                 } else {
 812                         IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 813                 }
 814
 815                 spin_lock(&imp->imp_lock);
 816                 if (imp->imp_invalid) {
 817                         spin_unlock(&imp->imp_lock);
 818                         ptlrpc_activate_import(imp);
 819                 } else {
 820                         spin_unlock(&imp->imp_lock);
 821                 }
 822
 823                 GOTO(finish, rc = 0);
 824         } else {
 825                 spin_unlock(&imp->imp_lock);
 826         }
 827
 828         /* Determine what recovery state to move the import to. */
 829         if (MSG_CONNECT_RECONNECT & msg_flags) {
 830                 memset(&old_hdl, 0, sizeof(old_hdl));
 831                 if (!memcmp(&old_hdl, lustre_msg_get_handle(request->rq_repmsg),
 832                             sizeof (old_hdl))) {
 833                         CERROR("%s@%s didn't like our handle "LPX64
 834                                ", failed\n", 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                         CDEBUG(level,"%s@%s changed server handle from "
 854                                      LPX64" to "LPX64"%s\n",
 855                                      obd2cli_tgt(imp->imp_obd),
 856                                      imp->imp_connection->c_remote_uuid.uuid,
 857                                      imp->imp_remote_handle.cookie,
 858                                      lustre_msg_get_handle(request->rq_repmsg)->
 859                                                                         cookie,
 860                                      (MSG_CONNECT_RECOVERING & msg_flags) ?
 861                                          " but is still in recovery" : "");
 862
 863                         imp->imp_remote_handle =
 864                                      *lustre_msg_get_handle(request->rq_repmsg);
 865
 866                         if (!(MSG_CONNECT_RECOVERING & msg_flags)) {
 867                                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 868                                 GOTO(finish, rc = 0);
 869                         }
 870
 871                 } else {
 872                         CDEBUG(D_HA, "reconnected to %s@%s after partition\n",
 873                                obd2cli_tgt(imp->imp_obd),
 874                                imp->imp_connection->c_remote_uuid.uuid);
 875                 }
 876
 877                 if (imp->imp_invalid) {
 878                         CDEBUG(D_HA, "%s: reconnected but import is invalid; "
 879                                "marking evicted\n", imp->imp_obd->obd_name);
 880                         IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 881                 } else if (MSG_CONNECT_RECOVERING & msg_flags) {
 882                         CDEBUG(D_HA, "%s: reconnected to %s during replay\n",
 883                                imp->imp_obd->obd_name,
 884                                obd2cli_tgt(imp->imp_obd));
 885
 886                         spin_lock(&imp->imp_lock);
 887                         imp->imp_resend_replay = 1;
 888                         spin_unlock(&imp->imp_lock);
 889
 890                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 891                 } else {
 892                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 893                 }
 894         } else if ((MSG_CONNECT_RECOVERING & msg_flags) && !imp->imp_invalid) {
 895                 LASSERT(imp->imp_replayable);
 896                 imp->imp_remote_handle =
 897                                 *lustre_msg_get_handle(request->rq_repmsg);
 898                 imp->imp_last_replay_transno = 0;
 899                 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 900         } else {
 901                 DEBUG_REQ(D_HA, request, "%s: evicting (reconnect/recover flags"
 902                           " not set: %x)", imp->imp_obd->obd_name, msg_flags);
 903                 imp->imp_remote_handle =
 904                                 *lustre_msg_get_handle(request->rq_repmsg);
 905                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 906         }
 907
 908         /* Sanity checks for a reconnected import. */
 909         if (!(imp->imp_replayable) != !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
 910                 CERROR("imp_replayable flag does not match server "
 911                        "after reconnect. We should LBUG right here.\n");
 912         }
 913
 914         if (lustre_msg_get_last_committed(request->rq_repmsg) <
 915             aa->pcaa_peer_committed) {
 916                 CERROR("%s went back in time (transno "LPD64
 917                        " was previously committed, server now claims "LPD64
 918                        ")!  See https://bugzilla.lustre.org/show_bug.cgi?"
 919                        "id=9646\n",
 920                        obd2cli_tgt(imp->imp_obd), aa->pcaa_peer_committed,
 921                        lustre_msg_get_last_committed(request->rq_repmsg));
 922         }
 923
 924 finish:
 925         rc = ptlrpc_import_recovery_state_machine(imp);
 926         if (rc != 0) {
 927                 if (rc == -ENOTCONN) {
 928                         CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
 929                                "invalidating and reconnecting\n",
 930                                obd2cli_tgt(imp->imp_obd),
 931                                imp->imp_connection->c_remote_uuid.uuid);
 932                         ptlrpc_connect_import(imp, NULL);
 933                         RETURN(0);
 934                 }
 935         } else {
 936                 struct obd_connect_data *ocd;
 937                 struct obd_export *exp;
 938                 int ret;
 939                 ret = req_capsule_get_size(&request->rq_pill, &RMF_CONNECT_DATA,
 940                                            RCL_SERVER);
 941                 /* server replied obd_connect_data is always bigger */
 942                 ocd = req_capsule_server_sized_get(&request->rq_pill,
 943                                                    &RMF_CONNECT_DATA, ret);
 944
 945                 spin_lock(&imp->imp_lock);
 946                 list_del(&imp->imp_conn_current->oic_item);
 947                 list_add(&imp->imp_conn_current->oic_item, &imp->imp_conn_list);
 948                 imp->imp_last_success_conn =
 949                         imp->imp_conn_current->oic_last_attempt;
 950
 951                 if (ocd == NULL) {
 952                         spin_unlock(&imp->imp_lock);
 953                         CERROR("Wrong connect data from server\n");
 954                         rc = -EPROTO;
 955                         GOTO(out, rc);
 956                 }
 957
 958                 imp->imp_connect_data = *ocd;
 959
 960                 exp = class_conn2export(&imp->imp_dlm_handle);
 961                 spin_unlock(&imp->imp_lock);
 962
 963                 /* check that server granted subset of flags we asked for. */
 964                 LASSERTF((ocd->ocd_connect_flags &
 965                           imp->imp_connect_flags_orig) ==
 966                          ocd->ocd_connect_flags, LPX64" != "LPX64,
 967                          imp->imp_connect_flags_orig, ocd->ocd_connect_flags);
 968
 969                 if (!exp) {
 970                         /* This could happen if export is cleaned during the
 971                            connect attempt */
 972                         CERROR("Missing export for %s\n",
 973                                imp->imp_obd->obd_name);
 974                         GOTO(out, rc = -ENODEV);
 975                 }
 976                 old_connect_flags = exp->exp_connect_flags;
 977                 exp->exp_connect_flags = ocd->ocd_connect_flags;
 978                 imp->imp_obd->obd_self_export->exp_connect_flags =
 979                                                         ocd->ocd_connect_flags;
 980                 class_export_put(exp);
 981
 982                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_OCD);
 983
 984                 if (!ocd->ocd_ibits_known &&
 985                     ocd->ocd_connect_flags & OBD_CONNECT_IBITS)
 986                         CERROR("Inodebits aware server returned zero compatible"
 987                                " bits?\n");
 988
 989                 if ((ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
 990                     (ocd->ocd_version > LUSTRE_VERSION_CODE +
 991                                         LUSTRE_VERSION_OFFSET_WARN ||
 992                      ocd->ocd_version < LUSTRE_VERSION_CODE -
 993                                         LUSTRE_VERSION_OFFSET_WARN)) {
 994                         /* Sigh, some compilers do not like #ifdef in the middle
 995                            of macro arguments */
 996 #ifdef __KERNEL__
 997                         const char *older =
 998                                 "older. Consider upgrading this client";
 999 #else
1000                         const char *older =
1001                                 "older. Consider recompiling this application";
1002 #endif
1003                         const char *newer = "newer than client version";
1004
1005                         LCONSOLE_WARN("Server %s version (%d.%d.%d.%d) "
1006                                       "is much %s (%s)\n",
1007                                       obd2cli_tgt(imp->imp_obd),
1008                                       OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
1009                                       OBD_OCD_VERSION_MINOR(ocd->ocd_version),
1010                                       OBD_OCD_VERSION_PATCH(ocd->ocd_version),
1011                                       OBD_OCD_VERSION_FIX(ocd->ocd_version),
1012                                       ocd->ocd_version > LUSTRE_VERSION_CODE ?
1013                                       newer : older, LUSTRE_VERSION_STRING);
1014                 }
1015
1016                 if (ocd->ocd_connect_flags & OBD_CONNECT_CKSUM) {
1017                         /* We sent to the server ocd_cksum_types with bits set
1018                          * for algorithms we understand. The server masked off
1019                          * the checksum types it doesn't support */
1020                         if ((ocd->ocd_cksum_types & OBD_CKSUM_ALL) == 0) {
1021                                 LCONSOLE_WARN("The negotiation of the checksum "
1022                                               "alogrithm to use with server %s "
1023                                               "failed (%x/%x), disabling "
1024                                               "checksums\n",
1025                                               obd2cli_tgt(imp->imp_obd),
1026                                               ocd->ocd_cksum_types,
1027                                               OBD_CKSUM_ALL);
1028                                 cli->cl_checksum = 0;
1029                                 cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
1030                                 cli->cl_cksum_type = OBD_CKSUM_CRC32;
1031                         } else {
1032                                 cli->cl_supp_cksum_types = ocd->ocd_cksum_types;
1033
1034                                 if (ocd->ocd_cksum_types & OSC_DEFAULT_CKSUM)
1035                                         cli->cl_cksum_type = OSC_DEFAULT_CKSUM;
1036                                 else if (ocd->ocd_cksum_types & OBD_CKSUM_ADLER)
1037                                         cli->cl_cksum_type = OBD_CKSUM_ADLER;
1038                                 else
1039                                         cli->cl_cksum_type = OBD_CKSUM_CRC32;
1040                         }
1041                 } else {
1042                         /* The server does not support OBD_CONNECT_CKSUM.
1043                          * Enforce CRC32 for backward compatibility*/
1044                         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
1045                         cli->cl_cksum_type = OBD_CKSUM_CRC32;
1046                 }
1047
1048                 if (ocd->ocd_connect_flags & OBD_CONNECT_BRW_SIZE) {
1049                         cli->cl_max_pages_per_rpc =
1050                                 ocd->ocd_brw_size >> CFS_PAGE_SHIFT;
1051                 }
1052
1053                 /* Reset ns_connect_flags only for initial connect. It might be
1054                  * changed in while using FS and if we reset it in reconnect
1055                  * this leads to lossing user settings done before such as
1056                  * disable lru_resize, etc. */
1057                 if (old_connect_flags != exp->exp_connect_flags ||
1058                     aa->pcaa_initial_connect) {
1059                         CWARN("%s: Resetting ns_connect_flags to server flags: "
1060                               LPX64"\n", imp->imp_obd->obd_name,
1061                               ocd->ocd_connect_flags);
1062                         imp->imp_obd->obd_namespace->ns_connect_flags =
1063                                 ocd->ocd_connect_flags;
1064                         imp->imp_obd->obd_namespace->ns_orig_connect_flags =
1065                                 ocd->ocd_connect_flags;
1066                 }
1067
1068                 if ((ocd->ocd_connect_flags & OBD_CONNECT_AT) &&
1069                     (imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
1070                         /* We need a per-message support flag, because
1071                            a. we don't know if the incoming connect reply
1072                               supports AT or not (in reply_in_callback)
1073                               until we unpack it.
1074                            b. failovered server means export and flags are gone
1075                               (in ptlrpc_send_reply).
1076                            Can only be set when we know AT is supported at
1077                            both ends */
1078                         imp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1079                 else
1080                         imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1081
1082                 LASSERT((cli->cl_max_pages_per_rpc <= PTLRPC_MAX_BRW_PAGES) &&
1083                         (cli->cl_max_pages_per_rpc > 0));
1084         }
1085
1086 out:
1087         if (rc != 0) {
1088                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
1089                 spin_lock(&imp->imp_lock);
1090                 if (aa->pcaa_initial_connect && !imp->imp_initial_recov &&
1091                     (request->rq_import_generation == imp->imp_generation))
1092                         ptlrpc_deactivate_and_unlock_import(imp);
1093                 else
1094                         spin_unlock(&imp->imp_lock);
1095
1096                 if ((imp->imp_recon_bk && imp->imp_last_recon) ||
1097                     (rc == -EACCES)) {
1098                         /*
1099                          * Give up trying to reconnect
1100                          * EACCES means client has no permission for connection
1101                          */
1102                         imp->imp_obd->obd_no_recov = 1;
1103                         ptlrpc_deactivate_import(imp);
1104                 }
1105
1106                 if (rc == -EPROTO) {
1107                         struct obd_connect_data *ocd;
1108
1109                         /* reply message might not be ready */
1110                         if (request->rq_repmsg == NULL)
1111                                 RETURN(-EPROTO);
1112
1113                         ocd = req_capsule_server_get(&request->rq_pill,
1114                                                      &RMF_CONNECT_DATA);
1115                         if (ocd &&
1116                             (ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
1117                             (ocd->ocd_version != LUSTRE_VERSION_CODE)) {
1118                            /* Actually servers are only supposed to refuse
1119                               connection from liblustre clients, so we should
1120                               never see this from VFS context */
1121                                 LCONSOLE_ERROR_MSG(0x16a, "Server %s version "
1122                                         "(%d.%d.%d.%d)"
1123                                         " refused connection from this client "
1124                                         "with an incompatible version (%s).  "
1125                                         "Client must be recompiled\n",
1126                                         obd2cli_tgt(imp->imp_obd),
1127                                         OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
1128                                         OBD_OCD_VERSION_MINOR(ocd->ocd_version),
1129                                         OBD_OCD_VERSION_PATCH(ocd->ocd_version),
1130                                         OBD_OCD_VERSION_FIX(ocd->ocd_version),
1131                                         LUSTRE_VERSION_STRING);
1132                                 ptlrpc_deactivate_import(imp);
1133                                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CLOSED);
1134                         }
1135                         RETURN(-EPROTO);
1136                 }
1137
1138                 ptlrpc_maybe_ping_import_soon(imp);
1139
1140                 CDEBUG(D_HA, "recovery of %s on %s failed (%d)\n",
1141                        obd2cli_tgt(imp->imp_obd),
1142                        (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
1143         }
1144
1145         spin_lock(&imp->imp_lock);
1146         imp->imp_last_recon = 0;
1147         spin_unlock(&imp->imp_lock);
1148
1149         cfs_waitq_signal(&imp->imp_recovery_waitq);
1150         RETURN(rc);
1151 }
1152
1153 static int completed_replay_interpret(const struct lu_env *env,
1154                                       struct ptlrpc_request *req,
1155                                       void * data, int rc)
1156 {
1157         ENTRY;
1158         atomic_dec(&req->rq_import->imp_replay_inflight);
1159         if (req->rq_status == 0) {
1160                 ptlrpc_import_recovery_state_machine(req->rq_import);
1161         } else {
1162                 CDEBUG(D_HA, "%s: LAST_REPLAY message error: %d, "
1163                        "reconnecting\n",
1164                        req->rq_import->imp_obd->obd_name, req->rq_status);
1165                 ptlrpc_connect_import(req->rq_import, NULL);
1166         }
1167
1168         RETURN(0);
1169 }
1170
1171 static int signal_completed_replay(struct obd_import *imp)
1172 {
1173         struct ptlrpc_request *req;
1174         ENTRY;
1175
1176         LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
1177         atomic_inc(&imp->imp_replay_inflight);
1178
1179         req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING, LUSTRE_OBD_VERSION,
1180                                         OBD_PING);
1181         if (req == NULL) {
1182                 atomic_dec(&imp->imp_replay_inflight);
1183                 RETURN(-ENOMEM);
1184         }
1185
1186         ptlrpc_request_set_replen(req);
1187         req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
1188         lustre_msg_add_flags(req->rq_reqmsg,
1189                              MSG_LOCK_REPLAY_DONE | MSG_REQ_REPLAY_DONE);
1190         req->rq_timeout *= 3;
1191         req->rq_interpret_reply = completed_replay_interpret;
1192
1193         ptlrpcd_add_req(req, PSCOPE_OTHER);
1194         RETURN(0);
1195 }
1196
1197 #ifdef __KERNEL__
1198 static int ptlrpc_invalidate_import_thread(void *data)
1199 {
1200         struct obd_import *imp = data;
1201         int disconnect;
1202
1203         ENTRY;
1204
1205         ptlrpc_daemonize("ll_imp_inval");
1206
1207         CDEBUG(D_HA, "thread invalidate import %s to %s@%s\n",
1208                imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
1209                imp->imp_connection->c_remote_uuid.uuid);
1210
1211         ptlrpc_invalidate_import(imp);
1212
1213         /* is client_disconnect_export in flight ? */
1214         spin_lock(&imp->imp_lock);
1215         disconnect = imp->imp_deactive;
1216         spin_unlock(&imp->imp_lock);
1217         if (disconnect)
1218                 GOTO(out, 0 );
1219
1220         if (obd_dump_on_eviction) {
1221                 CERROR("dump the log upon eviction\n");
1222                 libcfs_debug_dumplog();
1223         }
1224
1225         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1226         ptlrpc_import_recovery_state_machine(imp);
1227
1228 out:
1229         class_import_put(imp);
1230         RETURN(0);
1231 }
1232 #endif
1233
1234 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
1235 {
1236         int rc = 0;
1237         int inflight;
1238         char *target_start;
1239         int target_len;
1240
1241         ENTRY;
1242         if (imp->imp_state == LUSTRE_IMP_EVICTED) {
1243                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1244                           &target_start, &target_len);
1245                 /* Don't care about MGC eviction */
1246                 if (strcmp(imp->imp_obd->obd_type->typ_name,
1247                            LUSTRE_MGC_NAME) != 0) {
1248                         LCONSOLE_ERROR_MSG(0x167, "This client was evicted by "
1249                                            "%.*s; in progress operations using "
1250                                            "this service will fail.\n",
1251                                            target_len, target_start);
1252                 }
1253                 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
1254                        obd2cli_tgt(imp->imp_obd),
1255                        imp->imp_connection->c_remote_uuid.uuid);
1256
1257 #ifdef __KERNEL__
1258                 /* bug 17802:  XXX client_disconnect_export vs connect request
1259                  * race. if client will evicted at this time, we start
1260                  * invalidate thread without referece to import and import can
1261                  * be freed at same time. */
1262                 class_import_get(imp);
1263                 rc = cfs_kernel_thread(ptlrpc_invalidate_import_thread, imp,
1264                                        CLONE_VM | CLONE_FILES);
1265                 if (rc < 0) {
1266                         class_import_put(imp);
1267                         CERROR("error starting invalidate thread: %d\n", rc);
1268                 } else {
1269                         rc = 0;
1270                 }
1271                 RETURN(rc);
1272 #else
1273                 ptlrpc_invalidate_import(imp);
1274
1275                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1276 #endif
1277         }
1278
1279         if (imp->imp_state == LUSTRE_IMP_REPLAY) {
1280                 CDEBUG(D_HA, "replay requested by %s\n",
1281                        obd2cli_tgt(imp->imp_obd));
1282                 rc = ptlrpc_replay_next(imp, &inflight);
1283                 if (inflight == 0 &&
1284                     atomic_read(&imp->imp_replay_inflight) == 0) {
1285                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
1286                         rc = ldlm_replay_locks(imp);
1287                         if (rc)
1288                                 GOTO(out, rc);
1289                 }
1290                 rc = 0;
1291         }
1292
1293         if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
1294                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
1295                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
1296                         rc = signal_completed_replay(imp);
1297                         if (rc)
1298                                 GOTO(out, rc);
1299                 }
1300
1301         }
1302
1303         if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
1304                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
1305                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1306                 }
1307         }
1308
1309         if (imp->imp_state == LUSTRE_IMP_RECOVER) {
1310                 CDEBUG(D_HA, "reconnected to %s@%s\n",
1311                        obd2cli_tgt(imp->imp_obd),
1312                        imp->imp_connection->c_remote_uuid.uuid);
1313
1314                 rc = ptlrpc_resend(imp);
1315                 if (rc)
1316                         GOTO(out, rc);
1317                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
1318                 ptlrpc_activate_import(imp);
1319
1320                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1321                           &target_start, &target_len);
1322                 LCONSOLE_INFO("%s: Connection restored to service %.*s "
1323                               "using nid %s.\n", imp->imp_obd->obd_name,
1324                               target_len, target_start,
1325                               libcfs_nid2str(imp->imp_connection->c_peer.nid));
1326         }
1327
1328         if (imp->imp_state == LUSTRE_IMP_FULL) {
1329                 cfs_waitq_signal(&imp->imp_recovery_waitq);
1330                 ptlrpc_wake_delayed(imp);
1331         }
1332
1333 out:
1334         RETURN(rc);
1335 }
1336
1337 static int back_to_sleep(void *unused)
1338 {
1339         return 0;
1340 }
1341
1342 int ptlrpc_disconnect_import(struct obd_import *imp, int noclose)
1343 {
1344         struct ptlrpc_request *req;
1345         int rq_opc, rc = 0;
1346         int nowait = imp->imp_obd->obd_force;
1347         ENTRY;
1348
1349         if (nowait)
1350                 GOTO(set_state, rc);
1351
1352         switch (imp->imp_connect_op) {
1353         case OST_CONNECT: rq_opc = OST_DISCONNECT; break;
1354         case MDS_CONNECT: rq_opc = MDS_DISCONNECT; break;
1355         case MGS_CONNECT: rq_opc = MGS_DISCONNECT; break;
1356         default:
1357                 CERROR("don't know how to disconnect from %s (connect_op %d)\n",
1358                        obd2cli_tgt(imp->imp_obd), imp->imp_connect_op);
1359                 RETURN(-EINVAL);
1360         }
1361
1362         if (ptlrpc_import_in_recovery(imp)) {
1363                 struct l_wait_info lwi;
1364                 cfs_duration_t timeout;
1365
1366
1367                 if (AT_OFF) {
1368                         if (imp->imp_server_timeout)
1369                                 timeout = cfs_time_seconds(obd_timeout / 2);
1370                         else
1371                                 timeout = cfs_time_seconds(obd_timeout);
1372                 } else {
1373                         int idx = import_at_get_index(imp,
1374                                 imp->imp_client->cli_request_portal);
1375                         timeout = cfs_time_seconds(
1376                                 at_get(&imp->imp_at.iat_service_estimate[idx]));
1377                 }
1378
1379                 lwi = LWI_TIMEOUT_INTR(cfs_timeout_cap(timeout),
1380                                        back_to_sleep, LWI_ON_SIGNAL_NOOP, NULL);
1381                 rc = l_wait_event(imp->imp_recovery_waitq,
1382                                   !ptlrpc_import_in_recovery(imp), &lwi);
1383
1384         }
1385
1386         spin_lock(&imp->imp_lock);
1387         if (imp->imp_state != LUSTRE_IMP_FULL)
1388                 GOTO(out, 0);
1389
1390         spin_unlock(&imp->imp_lock);
1391
1392         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_DISCONNECT,
1393                                         LUSTRE_OBD_VERSION, rq_opc);
1394         if (req) {
1395                 /* We are disconnecting, do not retry a failed DISCONNECT rpc if
1396                  * it fails.  We can get through the above with a down server
1397                  * if the client doesn't know the server is gone yet. */
1398                 req->rq_no_resend = 1;
1399
1400 #ifndef CRAY_XT3
1401                 /* We want client umounts to happen quickly, no matter the
1402                    server state... */
1403                 req->rq_timeout = min_t(int, req->rq_timeout,
1404                                         INITIAL_CONNECT_TIMEOUT);
1405 #else
1406                 /* ... but we always want liblustre clients to nicely
1407                    disconnect, so only use the adaptive value. */
1408                 if (AT_OFF)
1409                         req->rq_timeout = obd_timeout / 3;
1410 #endif
1411
1412                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
1413                 req->rq_send_state =  LUSTRE_IMP_CONNECTING;
1414                 ptlrpc_request_set_replen(req);
1415                 rc = ptlrpc_queue_wait(req);
1416                 ptlrpc_req_finished(req);
1417         }
1418
1419 set_state:
1420         spin_lock(&imp->imp_lock);
1421 out:
1422         if (noclose)
1423                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
1424         else
1425                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
1426         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
1427         imp->imp_conn_cnt = 0;
1428         /* Try all connections in the future - bz 12758 */
1429         imp->imp_last_recon = 0;
1430         spin_unlock(&imp->imp_lock);
1431
1432         RETURN(rc);
1433 }
1434
1435
1436 /* Adaptive Timeout utils */
1437 extern unsigned int at_min, at_max, at_history;
1438
1439 /* Bin into timeslices using AT_BINS bins.
1440    This gives us a max of the last binlimit*AT_BINS secs without the storage,
1441    but still smoothing out a return to normalcy from a slow response.
1442    (E.g. remember the maximum latency in each minute of the last 4 minutes.) */
1443 int at_add(struct adaptive_timeout *at, unsigned int val)
1444 {
1445         unsigned int old = at->at_current;
1446         time_t now = cfs_time_current_sec();
1447         time_t binlimit = max_t(time_t, at_history / AT_BINS, 1);
1448
1449         LASSERT(at);
1450 #if 0
1451         CDEBUG(D_INFO, "add %u to %p time=%lu v=%u (%u %u %u %u)\n",
1452                val, at, now - at->at_binstart, at->at_current,
1453                at->at_hist[0], at->at_hist[1], at->at_hist[2], at->at_hist[3]);
1454 #endif
1455         if (val == 0)
1456                 /* 0's don't count, because we never want our timeout to
1457                    drop to 0, and because 0 could mean an error */
1458                 return 0;
1459
1460         spin_lock(&at->at_lock);
1461
1462         if (unlikely(at->at_binstart == 0)) {
1463                 /* Special case to remove default from history */
1464                 at->at_current = val;
1465                 at->at_worst_ever = val;
1466                 at->at_worst_time = now;
1467                 at->at_hist[0] = val;
1468                 at->at_binstart = now;
1469         } else if (now - at->at_binstart < binlimit ) {
1470                 /* in bin 0 */
1471                 at->at_hist[0] = max(val, at->at_hist[0]);
1472                 at->at_current = max(val, at->at_current);
1473         } else {
1474                 int i, shift;
1475                 unsigned int maxv = val;
1476                 /* move bins over */
1477                 shift = (now - at->at_binstart) / binlimit;
1478                 LASSERT(shift > 0);
1479                 for(i = AT_BINS - 1; i >= 0; i--) {
1480                         if (i >= shift) {
1481                                 at->at_hist[i] = at->at_hist[i - shift];
1482                                 maxv = max(maxv, at->at_hist[i]);
1483                         } else {
1484                                 at->at_hist[i] = 0;
1485                         }
1486                 }
1487                 at->at_hist[0] = val;
1488                 at->at_current = maxv;
1489                 at->at_binstart += shift * binlimit;
1490         }
1491
1492         if (at->at_current > at->at_worst_ever) {
1493                 at->at_worst_ever = at->at_current;
1494                 at->at_worst_time = now;
1495         }
1496
1497         if (at->at_flags & AT_FLG_NOHIST)
1498                 /* Only keep last reported val; keeping the rest of the history
1499                    for proc only */
1500                 at->at_current = val;
1501
1502         if (at_max > 0)
1503                 at->at_current =  min(at->at_current, at_max);
1504         at->at_current =  max(at->at_current, at_min);
1505
1506 #if 0
1507         if (at->at_current != old)
1508                 CDEBUG(D_ADAPTTO, "AT %p change: old=%u new=%u delta=%d "
1509                        "(val=%u) hist %u %u %u %u\n", at,
1510                        old, at->at_current, at->at_current - old, val,
1511                        at->at_hist[0], at->at_hist[1], at->at_hist[2],
1512                        at->at_hist[3]);
1513 #endif
1514
1515         /* if we changed, report the old value */
1516         old = (at->at_current != old) ? old : 0;
1517
1518         spin_unlock(&at->at_lock);
1519         return old;
1520 }
1521
1522 /* Find the imp_at index for a given portal; assign if space available */
1523 int import_at_get_index(struct obd_import *imp, int portal)
1524 {
1525         struct imp_at *at = &imp->imp_at;
1526         int i;
1527
1528         for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1529                 if (at->iat_portal[i] == portal)
1530                         return i;
1531                 if (at->iat_portal[i] == 0)
1532                         /* unused */
1533                         break;
1534         }
1535
1536         /* Not found in list, add it under a lock */
1537         spin_lock(&imp->imp_lock);
1538
1539         /* Check unused under lock */
1540         for (; i < IMP_AT_MAX_PORTALS; i++) {
1541                 if (at->iat_portal[i] == portal)
1542                         goto out;
1543                 if (at->iat_portal[i] == 0)
1544                         /* unused */
1545                         break;
1546         }
1547
1548         /* Not enough portals? */
1549         LASSERT(i < IMP_AT_MAX_PORTALS);
1550
1551         at->iat_portal[i] = portal;
1552 out:
1553         spin_unlock(&imp->imp_lock);
1554         return i;
1555 }