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 static void __import_set_state(struct obd_import *imp,
  63                                enum lustre_imp_state state)
  64 {
  65         imp->imp_state = state;
  66         imp->imp_state_hist[imp->imp_state_hist_idx].ish_state = state;
  67         imp->imp_state_hist[imp->imp_state_hist_idx].ish_time =
  68                 cfs_time_current_sec();
  69         imp->imp_state_hist_idx = (imp->imp_state_hist_idx + 1) %
  70                 IMP_STATE_HIST_LEN;
  71 }
  72
  73 /* A CLOSED import should remain so. */
  74 #define IMPORT_SET_STATE_NOLOCK(imp, state)                                    \
  75 do {                                                                           \
  76         if (imp->imp_state != LUSTRE_IMP_CLOSED) {                             \
  77                CDEBUG(D_HA, "%p %s: changing import state from %s to %s\n",    \
  78                       imp, obd2cli_tgt(imp->imp_obd),                          \
  79                       ptlrpc_import_state_name(imp->imp_state),                \
  80                       ptlrpc_import_state_name(state));                        \
  81                __import_set_state(imp, state);                                 \
  82         }                                                                      \
  83 } while(0)
  84
  85 #define IMPORT_SET_STATE(imp, state)            \
  86 do {                                            \
  87         spin_lock(&imp->imp_lock);              \
  88         IMPORT_SET_STATE_NOLOCK(imp, state);    \
  89         spin_unlock(&imp->imp_lock);            \
  90 } while(0)
  91
  92
  93 static int ptlrpc_connect_interpret(const struct lu_env *env,
  94                                     struct ptlrpc_request *request,
  95                                     void * data, int rc);
  96 int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
  97
  98 /* Only this function is allowed to change the import state when it is
  99  * CLOSED. I would rather refcount the import and free it after
 100  * disconnection like we do with exports. To do that, the client_obd
 101  * will need to save the peer info somewhere other than in the import,
 102  * though. */
 103 int ptlrpc_init_import(struct obd_import *imp)
 104 {
 105         spin_lock(&imp->imp_lock);
 106
 107         imp->imp_generation++;
 108         imp->imp_state =  LUSTRE_IMP_NEW;
 109
 110         spin_unlock(&imp->imp_lock);
 111
 112         return 0;
 113 }
 114 EXPORT_SYMBOL(ptlrpc_init_import);
 115
 116 #define UUID_STR "_UUID"
 117 static void deuuidify(char *uuid, const char *prefix, char **uuid_start,
 118                       int *uuid_len)
 119 {
 120         *uuid_start = !prefix || strncmp(uuid, prefix, strlen(prefix))
 121                 ? uuid : uuid + strlen(prefix);
 122
 123         *uuid_len = strlen(*uuid_start);
 124
 125         if (*uuid_len < strlen(UUID_STR))
 126                 return;
 127
 128         if (!strncmp(*uuid_start + *uuid_len - strlen(UUID_STR),
 129                     UUID_STR, strlen(UUID_STR)))
 130                 *uuid_len -= strlen(UUID_STR);
 131 }
 132
 133 /* Returns true if import was FULL, false if import was already not
 134  * connected.
 135  * @imp - import to be disconnected
 136  * @conn_cnt - connection count (epoch) of the request that timed out
 137  *             and caused the disconnection.  In some cases, multiple
 138  *             inflight requests can fail to a single target (e.g. OST
 139  *             bulk requests) and if one has already caused a reconnection
 140  *             (increasing the import->conn_cnt) the older failure should
 141  *             not also cause a reconnection.  If zero it forces a reconnect.
 142  */
 143 int ptlrpc_set_import_discon(struct obd_import *imp, __u32 conn_cnt)
 144 {
 145         int rc = 0;
 146
 147         spin_lock(&imp->imp_lock);
 148
 149         if (imp->imp_state == LUSTRE_IMP_FULL &&
 150             (conn_cnt == 0 || conn_cnt == imp->imp_conn_cnt)) {
 151                 char *target_start;
 152                 int   target_len;
 153
 154                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
 155                           &target_start, &target_len);
 156
 157                 if (imp->imp_replayable) {
 158                         LCONSOLE_WARN("%s: Connection to service %.*s via nid "
 159                                "%s was lost; in progress operations using this "
 160                                "service will wait for recovery to complete.\n",
 161                                imp->imp_obd->obd_name, target_len, target_start,
 162                                libcfs_nid2str(imp->imp_connection->c_peer.nid));
 163                 } else {
 164                         LCONSOLE_ERROR_MSG(0x166, "%s: Connection to service "
 165                                "%.*s via nid %s was lost; in progress "
 166                                "operations using this service will fail.\n",
 167                                imp->imp_obd->obd_name,
 168                                target_len, target_start,
 169                                libcfs_nid2str(imp->imp_connection->c_peer.nid));
 170                 }
 171                 ptlrpc_deactivate_timeouts(imp);
 172                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
 173                 spin_unlock(&imp->imp_lock);
 174
 175                 if (obd_dump_on_timeout)
 176                         libcfs_debug_dumplog();
 177
 178                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
 179                 rc = 1;
 180         } else {
 181                 spin_unlock(&imp->imp_lock);
 182                 CDEBUG(D_HA, "%s: import %p already %s (conn %u, was %u): %s\n",
 183                        imp->imp_client->cli_name, imp,
 184                        (imp->imp_state == LUSTRE_IMP_FULL &&
 185                         imp->imp_conn_cnt > conn_cnt) ?
 186                        "reconnected" : "not connected", imp->imp_conn_cnt,
 187                        conn_cnt, ptlrpc_import_state_name(imp->imp_state));
 188         }
 189
 190         return rc;
 191 }
 192
 193 /* Must be called with imp_lock held! */
 194 static void ptlrpc_deactivate_and_unlock_import(struct obd_import *imp)
 195 {
 196         ENTRY;
 197         LASSERT_SPIN_LOCKED(&imp->imp_lock);
 198
 199         CDEBUG(D_HA, "setting import %s INVALID\n", obd2cli_tgt(imp->imp_obd));
 200         imp->imp_invalid = 1;
 201         imp->imp_generation++;
 202         spin_unlock(&imp->imp_lock);
 203
 204         ptlrpc_abort_inflight(imp);
 205         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
 206
 207         EXIT;
 208 }
 209
 210 /*
 211  * This acts as a barrier; all existing requests are rejected, and
 212  * no new requests will be accepted until the import is valid again.
 213  */
 214 void ptlrpc_deactivate_import(struct obd_import *imp)
 215 {
 216         spin_lock(&imp->imp_lock);
 217         ptlrpc_deactivate_and_unlock_import(imp);
 218 }
 219
 220 static unsigned int
 221 ptlrpc_inflight_deadline(struct ptlrpc_request *req, time_t now)
 222 {
 223         long dl;
 224
 225         if (!(((req->rq_phase == RQ_PHASE_RPC) && !req->rq_waiting) ||
 226               (req->rq_phase == RQ_PHASE_BULK) ||
 227               (req->rq_phase == RQ_PHASE_NEW)))
 228                 return 0;
 229
 230         if (req->rq_timedout)
 231                 return 0;
 232
 233         if (req->rq_phase == RQ_PHASE_NEW)
 234                 dl = req->rq_sent;
 235         else
 236                 dl = req->rq_deadline;
 237
 238         if (dl <= now)
 239                 return 0;
 240
 241         return dl - now;
 242 }
 243
 244 static unsigned int ptlrpc_inflight_timeout(struct obd_import *imp)
 245 {
 246         time_t now = cfs_time_current_sec();
 247         struct list_head *tmp, *n;
 248         struct ptlrpc_request *req;
 249         unsigned int timeout = 0;
 250
 251         spin_lock(&imp->imp_lock);
 252         list_for_each_safe(tmp, n, &imp->imp_sending_list) {
 253                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 254                 timeout = max(ptlrpc_inflight_deadline(req, now), timeout);
 255         }
 256         spin_unlock(&imp->imp_lock);
 257         return timeout;
 258 }
 259
 260 /*
 261  * This function will invalidate the import, if necessary, then block
 262  * for all the RPC completions, and finally notify the obd to
 263  * invalidate its state (ie cancel locks, clear pending requests,
 264  * etc).
 265  */
 266 void ptlrpc_invalidate_import(struct obd_import *imp)
 267 {
 268         struct list_head *tmp, *n;
 269         struct ptlrpc_request *req;
 270         struct l_wait_info lwi;
 271         unsigned int timeout;
 272         int rc;
 273
 274         atomic_inc(&imp->imp_inval_count);
 275
 276         /*
 277          * If this is an invalid MGC connection, then don't bother
 278          * waiting for imp_inflight to drop to 0.
 279          */
 280         if (imp->imp_invalid && imp->imp_recon_bk &&!imp->imp_obd->obd_no_recov)
 281                 goto out;
 282
 283         if (!imp->imp_invalid || imp->imp_obd->obd_no_recov)
 284                 ptlrpc_deactivate_import(imp);
 285
 286         LASSERT(imp->imp_invalid);
 287
 288         /* Wait forever until inflight == 0. We really can't do it another
 289          * way because in some cases we need to wait for very long reply
 290          * unlink. We can't do anything before that because there is really
 291          * no guarantee that some rdma transfer is not in progress right now. */
 292         do {
 293                 /* Calculate max timeout for waiting on rpcs to error
 294                  * out. Use obd_timeout if calculated value is smaller
 295                  * than it. */
 296                 timeout = ptlrpc_inflight_timeout(imp);
 297                 timeout += timeout / 3;
 298
 299                 if (timeout == 0)
 300                         timeout = obd_timeout;
 301
 302                 CDEBUG(D_RPCTRACE,"Sleeping %d sec for inflight to error out\n",
 303                        timeout);
 304
 305                 /* Wait for all requests to error out and call completion
 306                  * callbacks. Cap it at obd_timeout -- these should all
 307                  * have been locally cancelled by ptlrpc_abort_inflight. */
 308                 lwi = LWI_TIMEOUT_INTERVAL(
 309                         cfs_timeout_cap(cfs_time_seconds(timeout)),
 310                         cfs_time_seconds(1), NULL, NULL);
 311                 rc = l_wait_event(imp->imp_recovery_waitq,
 312                                 (atomic_read(&imp->imp_inflight) == 0), &lwi);
 313                 if (rc) {
 314                         const char *cli_tgt = obd2cli_tgt(imp->imp_obd);
 315
 316                         CERROR("%s: rc = %d waiting for callback (%d != 0)\n",
 317                                cli_tgt, rc, atomic_read(&imp->imp_inflight));
 318
 319                         spin_lock(&imp->imp_lock);
 320                         list_for_each_safe(tmp, n, &imp->imp_sending_list) {
 321                                 req = list_entry(tmp, struct ptlrpc_request,
 322                                                  rq_list);
 323                                 DEBUG_REQ(D_ERROR, req,"still on sending list");
 324                         }
 325                         list_for_each_safe(tmp, n, &imp->imp_delayed_list) {
 326                                 req = list_entry(tmp, struct ptlrpc_request,
 327                                                  rq_list);
 328                                 DEBUG_REQ(D_ERROR, req,"still on delayed list");
 329                         }
 330
 331                         if (atomic_read(&imp->imp_unregistering) == 0) {
 332                                 /* We know that only "unregistering" rpcs may
 333                                  * still survive in sending or delaying lists
 334                                  * (They are waiting for long reply unlink in
 335                                  * sluggish nets). Let's check this. If there
 336                                  * is no unregistering and inflight != 0 this
 337                                  * is bug. */
 338                                 LASSERT(atomic_read(&imp->imp_inflight) == 0);
 339
 340                                 /* Let's save one loop as soon as inflight have
 341                                  * dropped to zero. No new inflights possible at
 342                                  * this point. */
 343                                 rc = 0;
 344                         } else {
 345                                 CERROR("%s: RPCs in \"%s\" phase found (%d). "
 346                                        "Network is sluggish? Waiting them "
 347                                        "to error out.\n", cli_tgt,
 348                                        ptlrpc_phase2str(RQ_PHASE_UNREGISTERING),
 349                                        atomic_read(&imp->imp_unregistering));
 350                         }
 351                         spin_unlock(&imp->imp_lock);
 352                   }
 353         } while (rc != 0);
 354
 355         /*
 356          * Let's additionally check that no new rpcs added to import in
 357          * "invalidate" state.
 358          */
 359         LASSERT(atomic_read(&imp->imp_inflight) == 0);
 360 out:
 361         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
 362         sptlrpc_import_flush_all_ctx(imp);
 363
 364         atomic_dec(&imp->imp_inval_count);
 365         cfs_waitq_broadcast(&imp->imp_recovery_waitq);
 366 }
 367
 368 /* unset imp_invalid */
 369 void ptlrpc_activate_import(struct obd_import *imp)
 370 {
 371         struct obd_device *obd = imp->imp_obd;
 372
 373         spin_lock(&imp->imp_lock);
 374         imp->imp_invalid = 0;
 375         ptlrpc_activate_timeouts(imp);
 376         spin_unlock(&imp->imp_lock);
 377         obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
 378 }
 379
 380 void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt)
 381 {
 382         ENTRY;
 383
 384         LASSERT(!imp->imp_dlm_fake);
 385
 386         if (ptlrpc_set_import_discon(imp, conn_cnt)) {
 387                 if (!imp->imp_replayable) {
 388                         CDEBUG(D_HA, "import %s@%s for %s not replayable, "
 389                                "auto-deactivating\n",
 390                                obd2cli_tgt(imp->imp_obd),
 391                                imp->imp_connection->c_remote_uuid.uuid,
 392                                imp->imp_obd->obd_name);
 393                         ptlrpc_deactivate_import(imp);
 394                 }
 395
 396                 CDEBUG(D_HA, "%s: waking up pinger\n",
 397                        obd2cli_tgt(imp->imp_obd));
 398
 399                 spin_lock(&imp->imp_lock);
 400                 imp->imp_force_verify = 1;
 401                 spin_unlock(&imp->imp_lock);
 402
 403                 ptlrpc_pinger_wake_up();
 404         }
 405         EXIT;
 406 }
 407
 408 int ptlrpc_reconnect_import(struct obd_import *imp)
 409 {
 410         ptlrpc_set_import_discon(imp, 0);
 411         /* Force a new connect attempt */
 412         ptlrpc_invalidate_import(imp);
 413         /* Do a fresh connect next time by zeroing the handle */
 414         ptlrpc_disconnect_import(imp, 1);
 415         /* Wait for all invalidate calls to finish */
 416         if (atomic_read(&imp->imp_inval_count) > 0) {
 417                 int rc;
 418                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
 419                 rc = l_wait_event(imp->imp_recovery_waitq,
 420                                   (atomic_read(&imp->imp_inval_count) == 0),
 421                                   &lwi);
 422                 if (rc)
 423                         CERROR("Interrupted, inval=%d\n",
 424                                atomic_read(&imp->imp_inval_count));
 425         }
 426
 427         /* Allow reconnect attempts */
 428         imp->imp_obd->obd_no_recov = 0;
 429         /* Remove 'invalid' flag */
 430         ptlrpc_activate_import(imp);
 431         /* Attempt a new connect */
 432         ptlrpc_recover_import(imp, NULL);
 433         return 0;
 434 }
 435
 436 EXPORT_SYMBOL(ptlrpc_reconnect_import);
 437
 438 static int import_select_connection(struct obd_import *imp)
 439 {
 440         struct obd_import_conn *imp_conn = NULL, *conn;
 441         struct obd_export *dlmexp;
 442         int tried_all = 1;
 443         ENTRY;
 444
 445         spin_lock(&imp->imp_lock);
 446
 447         if (list_empty(&imp->imp_conn_list)) {
 448                 CERROR("%s: no connections available\n",
 449                         imp->imp_obd->obd_name);
 450                 spin_unlock(&imp->imp_lock);
 451                 RETURN(-EINVAL);
 452         }
 453
 454         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 455                 CDEBUG(D_HA, "%s: connect to NID %s last attempt "LPU64"\n",
 456                        imp->imp_obd->obd_name,
 457                        libcfs_nid2str(conn->oic_conn->c_peer.nid),
 458                        conn->oic_last_attempt);
 459                 /* Don't thrash connections */
 460                 if (cfs_time_before_64(cfs_time_current_64(),
 461                                      conn->oic_last_attempt +
 462                                      cfs_time_seconds(CONNECTION_SWITCH_MIN))) {
 463                         continue;
 464                 }
 465
 466                 /* If we have not tried this connection since the
 467                    the last successful attempt, go with this one */
 468                 if ((conn->oic_last_attempt == 0) ||
 469                     cfs_time_beforeq_64(conn->oic_last_attempt,
 470                                        imp->imp_last_success_conn)) {
 471                         imp_conn = conn;
 472                         tried_all = 0;
 473                         break;
 474                 }
 475
 476                 /* If all of the connections have already been tried
 477                    since the last successful connection; just choose the
 478                    least recently used */
 479                 if (!imp_conn)
 480                         imp_conn = conn;
 481                 else if (cfs_time_before_64(conn->oic_last_attempt,
 482                                             imp_conn->oic_last_attempt))
 483                         imp_conn = conn;
 484         }
 485
 486         /* if not found, simply choose the current one */
 487         if (!imp_conn) {
 488                 LASSERT(imp->imp_conn_current);
 489                 imp_conn = imp->imp_conn_current;
 490                 tried_all = 0;
 491         }
 492         LASSERT(imp_conn->oic_conn);
 493
 494         /* If we've tried everything, and we're back to the beginning of the
 495            list, increase our timeout and try again. It will be reset when
 496            we do finally connect. (FIXME: really we should wait for all network
 497            state associated with the last connection attempt to drain before
 498            trying to reconnect on it.) */
 499         if (tried_all && (imp->imp_conn_list.next == &imp_conn->oic_item) &&
 500             !imp->imp_recon_bk /* not retrying */) {
 501                 if (at_get(&imp->imp_at.iat_net_latency) <
 502                     CONNECTION_SWITCH_MAX) {
 503                         at_add(&imp->imp_at.iat_net_latency,
 504                                at_get(&imp->imp_at.iat_net_latency) +
 505                                CONNECTION_SWITCH_INC);
 506                 }
 507                 LASSERT(imp_conn->oic_last_attempt);
 508                 CWARN("%s: tried all connections, increasing latency to %ds\n",
 509                       imp->imp_obd->obd_name,
 510                       at_get(&imp->imp_at.iat_net_latency));
 511         }
 512
 513         imp_conn->oic_last_attempt = cfs_time_current_64();
 514
 515         /* switch connection, don't mind if it's same as the current one */
 516         if (imp->imp_connection)
 517                 ptlrpc_connection_put(imp->imp_connection);
 518         imp->imp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 519
 520         dlmexp =  class_conn2export(&imp->imp_dlm_handle);
 521         LASSERT(dlmexp != NULL);
 522         if (dlmexp->exp_connection)
 523                 ptlrpc_connection_put(dlmexp->exp_connection);
 524         dlmexp->exp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 525         class_export_put(dlmexp);
 526
 527         if (imp->imp_conn_current != imp_conn) {
 528                 if (imp->imp_conn_current)
 529                         LCONSOLE_INFO("Changing connection for %s to %s/%s\n",
 530                                       imp->imp_obd->obd_name,
 531                                       imp_conn->oic_uuid.uuid,
 532                                       libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
 533                 imp->imp_conn_current = imp_conn;
 534         }
 535
 536         CDEBUG(D_HA, "%s: import %p using connection %s/%s\n",
 537                imp->imp_obd->obd_name, imp, imp_conn->oic_uuid.uuid,
 538                libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
 539
 540         spin_unlock(&imp->imp_lock);
 541
 542         RETURN(0);
 543 }
 544
 545 /*
 546  * must be called under imp_lock
 547  */
 548 static int ptlrpc_first_transno(struct obd_import *imp, __u64 *transno)
 549 {
 550         struct ptlrpc_request *req;
 551         struct list_head *tmp;
 552
 553         if (list_empty(&imp->imp_replay_list))
 554                 return 0;
 555         tmp = imp->imp_replay_list.next;
 556         req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
 557         *transno = req->rq_transno;
 558         if (req->rq_transno == 0) {
 559                 DEBUG_REQ(D_ERROR, req, "zero transno in replay");
 560                 LBUG();
 561         }
 562
 563         return 1;
 564 }
 565
 566 int ptlrpc_connect_import(struct obd_import *imp, char *new_uuid)
 567 {
 568         struct obd_device *obd = imp->imp_obd;
 569         int initial_connect = 0;
 570         int set_transno = 0;
 571         __u64 committed_before_reconnect = 0;
 572         struct ptlrpc_request *request;
 573         char *bufs[] = { NULL,
 574                          obd2cli_tgt(imp->imp_obd),
 575                          obd->obd_uuid.uuid,
 576                          (char *)&imp->imp_dlm_handle,
 577                          (char *)&imp->imp_connect_data };
 578         struct ptlrpc_connect_async_args *aa;
 579         int rc;
 580         ENTRY;
 581
 582         spin_lock(&imp->imp_lock);
 583         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 584                 spin_unlock(&imp->imp_lock);
 585                 CERROR("can't connect to a closed import\n");
 586                 RETURN(-EINVAL);
 587         } else if (imp->imp_state == LUSTRE_IMP_FULL) {
 588                 spin_unlock(&imp->imp_lock);
 589                 CERROR("already connected\n");
 590                 RETURN(0);
 591         } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
 592                 spin_unlock(&imp->imp_lock);
 593                 CERROR("already connecting\n");
 594                 RETURN(-EALREADY);
 595         }
 596
 597         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
 598
 599         imp->imp_conn_cnt++;
 600         imp->imp_resend_replay = 0;
 601
 602         if (!lustre_handle_is_used(&imp->imp_remote_handle))
 603                 initial_connect = 1;
 604         else
 605                 committed_before_reconnect = imp->imp_peer_committed_transno;
 606
 607         set_transno = ptlrpc_first_transno(imp,
 608                                            &imp->imp_connect_data.ocd_transno);
 609         spin_unlock(&imp->imp_lock);
 610
 611         if (new_uuid) {
 612                 struct obd_uuid uuid;
 613
 614                 obd_str2uuid(&uuid, new_uuid);
 615                 rc = import_set_conn_priority(imp, &uuid);
 616                 if (rc)
 617                         GOTO(out, rc);
 618         }
 619
 620         rc = import_select_connection(imp);
 621         if (rc)
 622                 GOTO(out, rc);
 623
 624         /* last in connection list */
 625         if (imp->imp_conn_current->oic_item.next == &imp->imp_conn_list) {
 626                 if (imp->imp_initial_recov_bk && initial_connect) {
 627                         CDEBUG(D_HA, "Last connection attempt (%d) for %s\n",
 628                                imp->imp_conn_cnt, obd2cli_tgt(imp->imp_obd));
 629                         /* Don't retry if connect fails */
 630                         rc = 0;
 631                         obd_set_info_async(obd->obd_self_export,
 632                                            sizeof(KEY_INIT_RECOV),
 633                                            KEY_INIT_RECOV,
 634                                            sizeof(rc), &rc, NULL);
 635                 }
 636                 if (imp->imp_recon_bk) {
 637                         CDEBUG(D_HA, "Last reconnection attempt (%d) for %s\n",
 638                                imp->imp_conn_cnt, obd2cli_tgt(imp->imp_obd));
 639                         spin_lock(&imp->imp_lock);
 640                         imp->imp_last_recon = 1;
 641                         spin_unlock(&imp->imp_lock);
 642                 }
 643         }
 644
 645         rc = sptlrpc_import_sec_adapt(imp, NULL, 0);
 646         if (rc)
 647                 GOTO(out, rc);
 648
 649         /* Reset connect flags to the originally requested flags, in case
 650          * the server is updated on-the-fly we will get the new features. */
 651         imp->imp_connect_data.ocd_connect_flags = imp->imp_connect_flags_orig;
 652         imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 653
 654         rc = obd_reconnect(NULL, imp->imp_obd->obd_self_export, obd,
 655                            &obd->obd_uuid, &imp->imp_connect_data, NULL);
 656         if (rc)
 657                 GOTO(out, rc);
 658
 659         request = ptlrpc_request_alloc(imp, &RQF_MDS_CONNECT);
 660         if (request == NULL)
 661                 GOTO(out, rc = -ENOMEM);
 662
 663         rc = ptlrpc_request_bufs_pack(request, LUSTRE_OBD_VERSION,
 664                                       imp->imp_connect_op, bufs, NULL);
 665         if (rc) {
 666                 ptlrpc_request_free(request);
 667                 GOTO(out, rc);
 668         }
 669
 670         /* Report the rpc service time to the server so that it knows how long
 671          * to wait for clients to join recovery */
 672         lustre_msg_set_service_time(request->rq_reqmsg,
 673                                     at_timeout2est(request->rq_timeout));
 674
 675         /* The amount of time we give the server to process the connect req.
 676          * import_select_connection will increase the net latency on
 677          * repeated reconnect attempts to cover slow networks.
 678          * We override/ignore the server rpc completion estimate here,
 679          * which may be large if this is a reconnect attempt */
 680         request->rq_timeout = INITIAL_CONNECT_TIMEOUT;
 681         lustre_msg_set_timeout(request->rq_reqmsg, request->rq_timeout);
 682
 683 #ifndef __KERNEL__
 684         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_LIBCLIENT);
 685 #endif
 686         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_NEXT_VER);
 687
 688         request->rq_no_resend = request->rq_no_delay = 1;
 689         request->rq_send_state = LUSTRE_IMP_CONNECTING;
 690         /* Allow a slightly larger reply for future growth compatibility */
 691         req_capsule_set_size(&request->rq_pill, &RMF_CONNECT_DATA, RCL_SERVER,
 692                              sizeof(struct obd_connect_data)+16*sizeof(__u64));
 693         ptlrpc_request_set_replen(request);
 694         request->rq_interpret_reply = ptlrpc_connect_interpret;
 695
 696         CLASSERT(sizeof (*aa) <= sizeof (request->rq_async_args));
 697         aa = ptlrpc_req_async_args(request);
 698         memset(aa, 0, sizeof *aa);
 699
 700         aa->pcaa_peer_committed = committed_before_reconnect;
 701         aa->pcaa_initial_connect = initial_connect;
 702
 703         if (aa->pcaa_initial_connect) {
 704                 spin_lock(&imp->imp_lock);
 705                 imp->imp_replayable = 1;
 706                 spin_unlock(&imp->imp_lock);
 707                 lustre_msg_add_op_flags(request->rq_reqmsg,
 708                                         MSG_CONNECT_INITIAL);
 709         }
 710
 711         if (set_transno)
 712                 lustre_msg_add_op_flags(request->rq_reqmsg,
 713                                         MSG_CONNECT_TRANSNO);
 714
 715         DEBUG_REQ(D_RPCTRACE, request, "(re)connect request");
 716         ptlrpcd_add_req(request, PSCOPE_OTHER);
 717         rc = 0;
 718 out:
 719         if (rc != 0) {
 720                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 721         }
 722
 723         RETURN(rc);
 724 }
 725 EXPORT_SYMBOL(ptlrpc_connect_import);
 726
 727 static void ptlrpc_maybe_ping_import_soon(struct obd_import *imp)
 728 {
 729 #ifdef __KERNEL__
 730         struct obd_import_conn *imp_conn;
 731 #endif
 732         int wake_pinger = 0;
 733
 734         ENTRY;
 735
 736         spin_lock(&imp->imp_lock);
 737         if (list_empty(&imp->imp_conn_list))
 738                 GOTO(unlock, 0);
 739
 740 #ifdef __KERNEL__
 741         imp_conn = list_entry(imp->imp_conn_list.prev,
 742                               struct obd_import_conn,
 743                               oic_item);
 744
 745         /* XXX: When the failover node is the primary node, it is possible
 746          * to have two identical connections in imp_conn_list. We must
 747          * compare not conn's pointers but NIDs, otherwise we can defeat
 748          * connection throttling. (See bug 14774.) */
 749         if (imp->imp_conn_current->oic_conn->c_peer.nid !=
 750                                 imp_conn->oic_conn->c_peer.nid) {
 751                 ptlrpc_ping_import_soon(imp);
 752                 wake_pinger = 1;
 753         }
 754 #else
 755         /* liblustre has no pinger thead, so we wakup pinger anyway */
 756         wake_pinger = 1;
 757 #endif
 758
 759  unlock:
 760         spin_unlock(&imp->imp_lock);
 761
 762         if (wake_pinger)
 763                 ptlrpc_pinger_wake_up();
 764
 765         EXIT;
 766 }
 767
 768 static int ptlrpc_connect_interpret(const struct lu_env *env,
 769                                     struct ptlrpc_request *request,
 770                                     void *data, int rc)
 771 {
 772         struct ptlrpc_connect_async_args *aa = data;
 773         struct obd_import *imp = request->rq_import;
 774         struct client_obd *cli = &imp->imp_obd->u.cli;
 775         struct lustre_handle old_hdl;
 776         __u64 old_connect_flags;
 777         int msg_flags;
 778         ENTRY;
 779
 780         spin_lock(&imp->imp_lock);
 781         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 782                 spin_unlock(&imp->imp_lock);
 783                 RETURN(0);
 784         }
 785         spin_unlock(&imp->imp_lock);
 786
 787         if (rc)
 788                 GOTO(out, rc);
 789
 790         LASSERT(imp->imp_conn_current);
 791
 792         msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
 793
 794         /* All imports are pingable */
 795         spin_lock(&imp->imp_lock);
 796         imp->imp_pingable = 1;
 797
 798         if (aa->pcaa_initial_connect) {
 799                 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
 800                         imp->imp_replayable = 1;
 801                         spin_unlock(&imp->imp_lock);
 802                         CDEBUG(D_HA, "connected to replayable target: %s\n",
 803                                obd2cli_tgt(imp->imp_obd));
 804                 } else {
 805                         imp->imp_replayable = 0;
 806                         spin_unlock(&imp->imp_lock);
 807                 }
 808
 809                 /* if applies, adjust the imp->imp_msg_magic here
 810                  * according to reply flags */
 811
 812                 imp->imp_remote_handle =
 813                                 *lustre_msg_get_handle(request->rq_repmsg);
 814
 815                 /* Initial connects are allowed for clients with non-random
 816                  * uuids when servers are in recovery.  Simply signal the
 817                  * servers replay is complete and wait in REPLAY_WAIT. */
 818                 if (msg_flags & MSG_CONNECT_RECOVERING) {
 819                         CDEBUG(D_HA, "connect to %s during recovery\n",
 820                                obd2cli_tgt(imp->imp_obd));
 821                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
 822                 } else {
 823                         IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 824                         ptlrpc_activate_import(imp);
 825                 }
 826
 827                 GOTO(finish, rc = 0);
 828         } else {
 829                 spin_unlock(&imp->imp_lock);
 830         }
 831
 832         /* Determine what recovery state to move the import to. */
 833         if (MSG_CONNECT_RECONNECT & msg_flags) {
 834                 memset(&old_hdl, 0, sizeof(old_hdl));
 835                 if (!memcmp(&old_hdl, lustre_msg_get_handle(request->rq_repmsg),
 836                             sizeof (old_hdl))) {
 837                         CERROR("%s@%s didn't like our handle "LPX64
 838                                ", failed\n", obd2cli_tgt(imp->imp_obd),
 839                                imp->imp_connection->c_remote_uuid.uuid,
 840                                imp->imp_dlm_handle.cookie);
 841                         GOTO(out, rc = -ENOTCONN);
 842                 }
 843
 844                 if (memcmp(&imp->imp_remote_handle,
 845                            lustre_msg_get_handle(request->rq_repmsg),
 846                            sizeof(imp->imp_remote_handle))) {
 847                         int level = msg_flags & MSG_CONNECT_RECOVERING ?
 848                                 D_HA : D_WARNING;
 849
 850                         /* Bug 16611/14775: if server handle have changed,
 851                          * that means some sort of disconnection happened.
 852                          * If the server is not in recovery, that also means it
 853                          * already erased all of our state because of previous
 854                          * eviction. If it is in recovery - we are safe to
 855                          * participate since we can reestablish all of our state
 856                          * with server again */
 857                         CDEBUG(level,"%s@%s changed server handle from "
 858                                      LPX64" to "LPX64"%s\n",
 859                                      obd2cli_tgt(imp->imp_obd),
 860                                      imp->imp_connection->c_remote_uuid.uuid,
 861                                      imp->imp_remote_handle.cookie,
 862                                      lustre_msg_get_handle(request->rq_repmsg)->
 863                                                                         cookie,
 864                                      (MSG_CONNECT_RECOVERING & msg_flags) ?
 865                                          " but is still in recovery" : "");
 866
 867                         imp->imp_remote_handle =
 868                                      *lustre_msg_get_handle(request->rq_repmsg);
 869
 870                         if (!(MSG_CONNECT_RECOVERING & msg_flags)) {
 871                                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 872                                 GOTO(finish, rc = 0);
 873                         }
 874
 875                 } else {
 876                         CDEBUG(D_HA, "reconnected to %s@%s after partition\n",
 877                                obd2cli_tgt(imp->imp_obd),
 878                                imp->imp_connection->c_remote_uuid.uuid);
 879                 }
 880
 881                 if (imp->imp_invalid) {
 882                         CDEBUG(D_HA, "%s: reconnected but import is invalid; "
 883                                "marking evicted\n", imp->imp_obd->obd_name);
 884                         IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 885                 } else if (MSG_CONNECT_RECOVERING & msg_flags) {
 886                         CDEBUG(D_HA, "%s: reconnected to %s during replay\n",
 887                                imp->imp_obd->obd_name,
 888                                obd2cli_tgt(imp->imp_obd));
 889
 890                         spin_lock(&imp->imp_lock);
 891                         imp->imp_resend_replay = 1;
 892                         spin_unlock(&imp->imp_lock);
 893
 894                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 895                 } else {
 896                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 897                 }
 898         } else if ((MSG_CONNECT_RECOVERING & msg_flags) && !imp->imp_invalid) {
 899                 LASSERT(imp->imp_replayable);
 900                 imp->imp_remote_handle =
 901                                 *lustre_msg_get_handle(request->rq_repmsg);
 902                 imp->imp_last_replay_transno = 0;
 903                 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 904         } else {
 905                 DEBUG_REQ(D_HA, request, "%s: evicting (reconnect/recover flags"
 906                           " not set: %x)", imp->imp_obd->obd_name, msg_flags);
 907                 imp->imp_remote_handle =
 908                                 *lustre_msg_get_handle(request->rq_repmsg);
 909                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 910         }
 911
 912         /* Sanity checks for a reconnected import. */
 913         if (!(imp->imp_replayable) != !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
 914                 CERROR("imp_replayable flag does not match server "
 915                        "after reconnect. We should LBUG right here.\n");
 916         }
 917
 918         if (lustre_msg_get_last_committed(request->rq_repmsg) <
 919             aa->pcaa_peer_committed) {
 920                 CERROR("%s went back in time (transno "LPD64
 921                        " was previously committed, server now claims "LPD64
 922                        ")!  See https://bugzilla.lustre.org/show_bug.cgi?"
 923                        "id=9646\n",
 924                        obd2cli_tgt(imp->imp_obd), aa->pcaa_peer_committed,
 925                        lustre_msg_get_last_committed(request->rq_repmsg));
 926         }
 927
 928 finish:
 929         rc = ptlrpc_import_recovery_state_machine(imp);
 930         if (rc != 0) {
 931                 if (rc == -ENOTCONN) {
 932                         CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
 933                                "invalidating and reconnecting\n",
 934                                obd2cli_tgt(imp->imp_obd),
 935                                imp->imp_connection->c_remote_uuid.uuid);
 936                         ptlrpc_connect_import(imp, NULL);
 937                         RETURN(0);
 938                 }
 939         } else {
 940                 struct obd_connect_data *ocd;
 941                 struct obd_export *exp;
 942                 int ret;
 943                 ret = req_capsule_get_size(&request->rq_pill, &RMF_CONNECT_DATA,
 944                                            RCL_SERVER);
 945                 /* server replied obd_connect_data is always bigger */
 946                 ocd = req_capsule_server_sized_get(&request->rq_pill,
 947                                                    &RMF_CONNECT_DATA, ret);
 948
 949                 spin_lock(&imp->imp_lock);
 950                 list_del(&imp->imp_conn_current->oic_item);
 951                 list_add(&imp->imp_conn_current->oic_item, &imp->imp_conn_list);
 952                 imp->imp_last_success_conn =
 953                         imp->imp_conn_current->oic_last_attempt;
 954
 955                 if (ocd == NULL) {
 956                         spin_unlock(&imp->imp_lock);
 957                         CERROR("Wrong connect data from server\n");
 958                         rc = -EPROTO;
 959                         GOTO(out, rc);
 960                 }
 961
 962                 imp->imp_connect_data = *ocd;
 963
 964                 exp = class_conn2export(&imp->imp_dlm_handle);
 965                 spin_unlock(&imp->imp_lock);
 966
 967                 /* check that server granted subset of flags we asked for. */
 968                 LASSERTF((ocd->ocd_connect_flags &
 969                           imp->imp_connect_flags_orig) ==
 970                          ocd->ocd_connect_flags, LPX64" != "LPX64,
 971                          imp->imp_connect_flags_orig, ocd->ocd_connect_flags);
 972
 973                 if (!exp) {
 974                         /* This could happen if export is cleaned during the
 975                            connect attempt */
 976                         CERROR("Missing export for %s\n",
 977                                imp->imp_obd->obd_name);
 978                         GOTO(out, rc = -ENODEV);
 979                 }
 980                 old_connect_flags = exp->exp_connect_flags;
 981                 exp->exp_connect_flags = ocd->ocd_connect_flags;
 982                 imp->imp_obd->obd_self_export->exp_connect_flags =
 983                                                         ocd->ocd_connect_flags;
 984                 class_export_put(exp);
 985
 986                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_OCD);
 987
 988                 if (!ocd->ocd_ibits_known &&
 989                     ocd->ocd_connect_flags & OBD_CONNECT_IBITS)
 990                         CERROR("Inodebits aware server returned zero compatible"
 991                                " bits?\n");
 992
 993                 if ((ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
 994                     (ocd->ocd_version > LUSTRE_VERSION_CODE +
 995                                         LUSTRE_VERSION_OFFSET_WARN ||
 996                      ocd->ocd_version < LUSTRE_VERSION_CODE -
 997                                         LUSTRE_VERSION_OFFSET_WARN)) {
 998                         /* Sigh, some compilers do not like #ifdef in the middle
 999                            of macro arguments */
1000 #ifdef __KERNEL__
1001                         const char *older =
1002                                 "older. Consider upgrading this client";
1003 #else
1004                         const char *older =
1005                                 "older. Consider recompiling this application";
1006 #endif
1007                         const char *newer = "newer than client version";
1008
1009                         LCONSOLE_WARN("Server %s version (%d.%d.%d.%d) "
1010                                       "is much %s (%s)\n",
1011                                       obd2cli_tgt(imp->imp_obd),
1012                                       OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
1013                                       OBD_OCD_VERSION_MINOR(ocd->ocd_version),
1014                                       OBD_OCD_VERSION_PATCH(ocd->ocd_version),
1015                                       OBD_OCD_VERSION_FIX(ocd->ocd_version),
1016                                       ocd->ocd_version > LUSTRE_VERSION_CODE ?
1017                                       newer : older, LUSTRE_VERSION_STRING);
1018                 }
1019
1020                 if (ocd->ocd_connect_flags & OBD_CONNECT_CKSUM) {
1021                         /* We sent to the server ocd_cksum_types with bits set
1022                          * for algorithms we understand. The server masked off
1023                          * the checksum types it doesn't support */
1024                         if ((ocd->ocd_cksum_types & OBD_CKSUM_ALL) == 0) {
1025                                 LCONSOLE_WARN("The negotiation of the checksum "
1026                                               "alogrithm to use with server %s "
1027                                               "failed (%x/%x), disabling "
1028                                               "checksums\n",
1029                                               obd2cli_tgt(imp->imp_obd),
1030                                               ocd->ocd_cksum_types,
1031                                               OBD_CKSUM_ALL);
1032                                 cli->cl_checksum = 0;
1033                                 cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
1034                                 cli->cl_cksum_type = OBD_CKSUM_CRC32;
1035                         } else {
1036                                 cli->cl_supp_cksum_types = ocd->ocd_cksum_types;
1037
1038                                 if (ocd->ocd_cksum_types & OSC_DEFAULT_CKSUM)
1039                                         cli->cl_cksum_type = OSC_DEFAULT_CKSUM;
1040                                 else if (ocd->ocd_cksum_types & OBD_CKSUM_ADLER)
1041                                         cli->cl_cksum_type = OBD_CKSUM_ADLER;
1042                                 else
1043                                         cli->cl_cksum_type = OBD_CKSUM_CRC32;
1044                         }
1045                 } else {
1046                         /* The server does not support OBD_CONNECT_CKSUM.
1047                          * Enforce CRC32 for backward compatibility*/
1048                         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
1049                         cli->cl_cksum_type = OBD_CKSUM_CRC32;
1050                 }
1051
1052                 if (ocd->ocd_connect_flags & OBD_CONNECT_BRW_SIZE) {
1053                         cli->cl_max_pages_per_rpc =
1054                                 ocd->ocd_brw_size >> CFS_PAGE_SHIFT;
1055                 }
1056
1057                 /* Reset ns_connect_flags only for initial connect. It might be
1058                  * changed in while using FS and if we reset it in reconnect
1059                  * this leads to lossing user settings done before such as
1060                  * disable lru_resize, etc. */
1061                 if (old_connect_flags != exp->exp_connect_flags ||
1062                     aa->pcaa_initial_connect) {
1063                         CDEBUG(D_HA, "%s: Resetting ns_connect_flags to server "
1064                                "flags: "LPX64"\n", imp->imp_obd->obd_name,
1065                               ocd->ocd_connect_flags);
1066                         imp->imp_obd->obd_namespace->ns_connect_flags =
1067                                 ocd->ocd_connect_flags;
1068                         imp->imp_obd->obd_namespace->ns_orig_connect_flags =
1069                                 ocd->ocd_connect_flags;
1070                 }
1071
1072                 if ((ocd->ocd_connect_flags & OBD_CONNECT_AT) &&
1073                     (imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
1074                         /* We need a per-message support flag, because
1075                            a. we don't know if the incoming connect reply
1076                               supports AT or not (in reply_in_callback)
1077                               until we unpack it.
1078                            b. failovered server means export and flags are gone
1079                               (in ptlrpc_send_reply).
1080                            Can only be set when we know AT is supported at
1081                            both ends */
1082                         imp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1083                 else
1084                         imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1085
1086                 LASSERT((cli->cl_max_pages_per_rpc <= PTLRPC_MAX_BRW_PAGES) &&
1087                         (cli->cl_max_pages_per_rpc > 0));
1088         }
1089
1090 out:
1091         if (rc != 0) {
1092                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
1093                 spin_lock(&imp->imp_lock);
1094                 if (aa->pcaa_initial_connect && !imp->imp_initial_recov &&
1095                     (request->rq_import_generation == imp->imp_generation))
1096                         ptlrpc_deactivate_and_unlock_import(imp);
1097                 else
1098                         spin_unlock(&imp->imp_lock);
1099
1100                 if ((imp->imp_recon_bk && imp->imp_last_recon) ||
1101                     (rc == -EACCES)) {
1102                         /*
1103                          * Give up trying to reconnect
1104                          * EACCES means client has no permission for connection
1105                          */
1106                         imp->imp_obd->obd_no_recov = 1;
1107                         ptlrpc_deactivate_import(imp);
1108                 }
1109
1110                 if (rc == -EPROTO) {
1111                         struct obd_connect_data *ocd;
1112
1113                         /* reply message might not be ready */
1114                         if (request->rq_repmsg == NULL)
1115                                 RETURN(-EPROTO);
1116
1117                         ocd = req_capsule_server_get(&request->rq_pill,
1118                                                      &RMF_CONNECT_DATA);
1119                         if (ocd &&
1120                             (ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
1121                             (ocd->ocd_version != LUSTRE_VERSION_CODE)) {
1122                            /* Actually servers are only supposed to refuse
1123                               connection from liblustre clients, so we should
1124                               never see this from VFS context */
1125                                 LCONSOLE_ERROR_MSG(0x16a, "Server %s version "
1126                                         "(%d.%d.%d.%d)"
1127                                         " refused connection from this client "
1128                                         "with an incompatible version (%s).  "
1129                                         "Client must be recompiled\n",
1130                                         obd2cli_tgt(imp->imp_obd),
1131                                         OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
1132                                         OBD_OCD_VERSION_MINOR(ocd->ocd_version),
1133                                         OBD_OCD_VERSION_PATCH(ocd->ocd_version),
1134                                         OBD_OCD_VERSION_FIX(ocd->ocd_version),
1135                                         LUSTRE_VERSION_STRING);
1136                                 ptlrpc_deactivate_import(imp);
1137                                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CLOSED);
1138                         }
1139                         RETURN(-EPROTO);
1140                 }
1141
1142                 ptlrpc_maybe_ping_import_soon(imp);
1143
1144                 CDEBUG(D_HA, "recovery of %s on %s failed (%d)\n",
1145                        obd2cli_tgt(imp->imp_obd),
1146                        (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
1147         }
1148
1149         spin_lock(&imp->imp_lock);
1150         imp->imp_last_recon = 0;
1151         spin_unlock(&imp->imp_lock);
1152
1153         cfs_waitq_broadcast(&imp->imp_recovery_waitq);
1154         RETURN(rc);
1155 }
1156
1157 static int completed_replay_interpret(const struct lu_env *env,
1158                                       struct ptlrpc_request *req,
1159                                       void * data, int rc)
1160 {
1161         ENTRY;
1162         atomic_dec(&req->rq_import->imp_replay_inflight);
1163         if (req->rq_status == 0 &&
1164             !req->rq_import->imp_vbr_failed) {
1165                 ptlrpc_import_recovery_state_machine(req->rq_import);
1166         } else {
1167                 if (req->rq_import->imp_vbr_failed) {
1168                         CDEBUG(D_WARNING,
1169                                "%s: version recovery fails, reconnecting\n",
1170                                req->rq_import->imp_obd->obd_name);
1171                         spin_lock(&req->rq_import->imp_lock);
1172                         req->rq_import->imp_vbr_failed = 0;
1173                         spin_unlock(&req->rq_import->imp_lock);
1174                 } else {
1175                         CDEBUG(D_HA, "%s: LAST_REPLAY message error: %d, "
1176                                      "reconnecting\n",
1177                                req->rq_import->imp_obd->obd_name,
1178                                req->rq_status);
1179                 }
1180                 ptlrpc_connect_import(req->rq_import, NULL);
1181         }
1182
1183         RETURN(0);
1184 }
1185
1186 static int signal_completed_replay(struct obd_import *imp)
1187 {
1188         struct ptlrpc_request *req;
1189         ENTRY;
1190
1191         LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
1192         atomic_inc(&imp->imp_replay_inflight);
1193
1194         req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING, LUSTRE_OBD_VERSION,
1195                                         OBD_PING);
1196         if (req == NULL) {
1197                 atomic_dec(&imp->imp_replay_inflight);
1198                 RETURN(-ENOMEM);
1199         }
1200
1201         ptlrpc_request_set_replen(req);
1202         req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
1203         lustre_msg_add_flags(req->rq_reqmsg,
1204                              MSG_LOCK_REPLAY_DONE | MSG_REQ_REPLAY_DONE);
1205         req->rq_timeout *= 3;
1206         req->rq_interpret_reply = completed_replay_interpret;
1207
1208         ptlrpcd_add_req(req, PSCOPE_OTHER);
1209         RETURN(0);
1210 }
1211
1212 #ifdef __KERNEL__
1213 static int ptlrpc_invalidate_import_thread(void *data)
1214 {
1215         struct obd_import *imp = data;
1216
1217         ENTRY;
1218
1219         ptlrpc_daemonize("ll_imp_inval");
1220
1221         CDEBUG(D_HA, "thread invalidate import %s to %s@%s\n",
1222                imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
1223                imp->imp_connection->c_remote_uuid.uuid);
1224
1225         ptlrpc_invalidate_import(imp);
1226
1227         if (obd_dump_on_eviction) {
1228                 CERROR("dump the log upon eviction\n");
1229                 libcfs_debug_dumplog();
1230         }
1231
1232         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1233         ptlrpc_import_recovery_state_machine(imp);
1234
1235         class_import_put(imp);
1236         RETURN(0);
1237 }
1238 #endif
1239
1240 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
1241 {
1242         int rc = 0;
1243         int inflight;
1244         char *target_start;
1245         int target_len;
1246
1247         ENTRY;
1248         if (imp->imp_state == LUSTRE_IMP_EVICTED) {
1249                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1250                           &target_start, &target_len);
1251                 /* Don't care about MGC eviction */
1252                 if (strcmp(imp->imp_obd->obd_type->typ_name,
1253                            LUSTRE_MGC_NAME) != 0) {
1254                         LCONSOLE_ERROR_MSG(0x167, "This client was evicted by "
1255                                            "%.*s; in progress operations using "
1256                                            "this service will fail.\n",
1257                                            target_len, target_start);
1258                 }
1259                 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
1260                        obd2cli_tgt(imp->imp_obd),
1261                        imp->imp_connection->c_remote_uuid.uuid);
1262
1263 #ifdef __KERNEL__
1264                 /* bug 17802:  XXX client_disconnect_export vs connect request
1265                  * race. if client will evicted at this time, we start
1266                  * invalidate thread without referece to import and import can
1267                  * be freed at same time. */
1268                 class_import_get(imp);
1269                 rc = cfs_kernel_thread(ptlrpc_invalidate_import_thread, imp,
1270                                        CLONE_VM | CLONE_FILES);
1271                 if (rc < 0) {
1272                         class_import_put(imp);
1273                         CERROR("error starting invalidate thread: %d\n", rc);
1274                 } else {
1275                         rc = 0;
1276                 }
1277                 RETURN(rc);
1278 #else
1279                 ptlrpc_invalidate_import(imp);
1280
1281                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1282 #endif
1283         }
1284
1285         if (imp->imp_state == LUSTRE_IMP_REPLAY) {
1286                 CDEBUG(D_HA, "replay requested by %s\n",
1287                        obd2cli_tgt(imp->imp_obd));
1288                 rc = ptlrpc_replay_next(imp, &inflight);
1289                 if (inflight == 0 &&
1290                     atomic_read(&imp->imp_replay_inflight) == 0) {
1291                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
1292                         rc = ldlm_replay_locks(imp);
1293                         if (rc)
1294                                 GOTO(out, rc);
1295                 }
1296                 rc = 0;
1297         }
1298
1299         if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
1300                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
1301                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
1302                         rc = signal_completed_replay(imp);
1303                         if (rc)
1304                                 GOTO(out, rc);
1305                 }
1306
1307         }
1308
1309         if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
1310                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
1311                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1312                 }
1313         }
1314
1315         if (imp->imp_state == LUSTRE_IMP_RECOVER) {
1316                 CDEBUG(D_HA, "reconnected to %s@%s\n",
1317                        obd2cli_tgt(imp->imp_obd),
1318                        imp->imp_connection->c_remote_uuid.uuid);
1319
1320                 rc = ptlrpc_resend(imp);
1321                 if (rc)
1322                         GOTO(out, rc);
1323                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
1324                 ptlrpc_activate_import(imp);
1325
1326                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1327                           &target_start, &target_len);
1328                 LCONSOLE_INFO("%s: Connection restored to service %.*s "
1329                               "using nid %s.\n", imp->imp_obd->obd_name,
1330                               target_len, target_start,
1331                               libcfs_nid2str(imp->imp_connection->c_peer.nid));
1332         }
1333
1334         if (imp->imp_state == LUSTRE_IMP_FULL) {
1335                 cfs_waitq_broadcast(&imp->imp_recovery_waitq);
1336                 ptlrpc_wake_delayed(imp);
1337         }
1338
1339 out:
1340         RETURN(rc);
1341 }
1342
1343 static int back_to_sleep(void *unused)
1344 {
1345         return 0;
1346 }
1347
1348 int ptlrpc_disconnect_import(struct obd_import *imp, int noclose)
1349 {
1350         struct ptlrpc_request *req;
1351         int rq_opc, rc = 0;
1352         int nowait = imp->imp_obd->obd_force;
1353         ENTRY;
1354
1355         if (nowait)
1356                 GOTO(set_state, rc);
1357
1358         switch (imp->imp_connect_op) {
1359         case OST_CONNECT: rq_opc = OST_DISCONNECT; break;
1360         case MDS_CONNECT: rq_opc = MDS_DISCONNECT; break;
1361         case MGS_CONNECT: rq_opc = MGS_DISCONNECT; break;
1362         default:
1363                 CERROR("don't know how to disconnect from %s (connect_op %d)\n",
1364                        obd2cli_tgt(imp->imp_obd), imp->imp_connect_op);
1365                 RETURN(-EINVAL);
1366         }
1367
1368         if (ptlrpc_import_in_recovery(imp)) {
1369                 struct l_wait_info lwi;
1370                 cfs_duration_t timeout;
1371
1372
1373                 if (AT_OFF) {
1374                         if (imp->imp_server_timeout)
1375                                 timeout = cfs_time_seconds(obd_timeout / 2);
1376                         else
1377                                 timeout = cfs_time_seconds(obd_timeout);
1378                 } else {
1379                         int idx = import_at_get_index(imp,
1380                                 imp->imp_client->cli_request_portal);
1381                         timeout = cfs_time_seconds(
1382                                 at_get(&imp->imp_at.iat_service_estimate[idx]));
1383                 }
1384
1385                 lwi = LWI_TIMEOUT_INTR(cfs_timeout_cap(timeout),
1386                                        back_to_sleep, LWI_ON_SIGNAL_NOOP, NULL);
1387                 rc = l_wait_event(imp->imp_recovery_waitq,
1388                                   !ptlrpc_import_in_recovery(imp), &lwi);
1389
1390         }
1391
1392         spin_lock(&imp->imp_lock);
1393         if (imp->imp_state != LUSTRE_IMP_FULL)
1394                 GOTO(out, 0);
1395
1396         spin_unlock(&imp->imp_lock);
1397
1398         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_DISCONNECT,
1399                                         LUSTRE_OBD_VERSION, rq_opc);
1400         if (req) {
1401                 /* We are disconnecting, do not retry a failed DISCONNECT rpc if
1402                  * it fails.  We can get through the above with a down server
1403                  * if the client doesn't know the server is gone yet. */
1404                 req->rq_no_resend = 1;
1405
1406 #ifndef CRAY_XT3
1407                 /* We want client umounts to happen quickly, no matter the
1408                    server state... */
1409                 req->rq_timeout = min_t(int, req->rq_timeout,
1410                                         INITIAL_CONNECT_TIMEOUT);
1411 #else
1412                 /* ... but we always want liblustre clients to nicely
1413                    disconnect, so only use the adaptive value. */
1414                 if (AT_OFF)
1415                         req->rq_timeout = obd_timeout / 3;
1416 #endif
1417
1418                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
1419                 req->rq_send_state =  LUSTRE_IMP_CONNECTING;
1420                 ptlrpc_request_set_replen(req);
1421                 rc = ptlrpc_queue_wait(req);
1422                 ptlrpc_req_finished(req);
1423         }
1424
1425 set_state:
1426         spin_lock(&imp->imp_lock);
1427 out:
1428         if (noclose)
1429                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
1430         else
1431                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
1432         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
1433         /* Try all connections in the future - bz 12758 */
1434         imp->imp_last_recon = 0;
1435         spin_unlock(&imp->imp_lock);
1436
1437         RETURN(rc);
1438 }
1439
1440 void ptlrpc_cleanup_imp(struct obd_import *imp)
1441 {
1442         ENTRY;
1443
1444         spin_lock(&imp->imp_lock);
1445         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
1446         imp->imp_generation++;
1447         spin_unlock(&imp->imp_lock);
1448         ptlrpc_abort_inflight(imp);
1449
1450         EXIT;
1451 }
1452
1453 /* Adaptive Timeout utils */
1454 extern unsigned int at_min, at_max, at_history;
1455
1456 /* Bin into timeslices using AT_BINS bins.
1457    This gives us a max of the last binlimit*AT_BINS secs without the storage,
1458    but still smoothing out a return to normalcy from a slow response.
1459    (E.g. remember the maximum latency in each minute of the last 4 minutes.) */
1460 int at_add(struct adaptive_timeout *at, unsigned int val)
1461 {
1462         unsigned int old = at->at_current;
1463         time_t now = cfs_time_current_sec();
1464         time_t binlimit = max_t(time_t, at_history / AT_BINS, 1);
1465
1466         LASSERT(at);
1467         CDEBUG(D_OTHER, "add %u to %p time=%lu v=%u (%u %u %u %u)\n",
1468                val, at, now - at->at_binstart, at->at_current,
1469                at->at_hist[0], at->at_hist[1], at->at_hist[2], at->at_hist[3]);
1470
1471         if (val == 0)
1472                 /* 0's don't count, because we never want our timeout to
1473                    drop to 0, and because 0 could mean an error */
1474                 return 0;
1475
1476         spin_lock(&at->at_lock);
1477
1478         if (unlikely(at->at_binstart == 0)) {
1479                 /* Special case to remove default from history */
1480                 at->at_current = val;
1481                 at->at_worst_ever = val;
1482                 at->at_worst_time = now;
1483                 at->at_hist[0] = val;
1484                 at->at_binstart = now;
1485         } else if (now - at->at_binstart < binlimit ) {
1486                 /* in bin 0 */
1487                 at->at_hist[0] = max(val, at->at_hist[0]);
1488                 at->at_current = max(val, at->at_current);
1489         } else {
1490                 int i, shift;
1491                 unsigned int maxv = val;
1492                 /* move bins over */
1493                 shift = (now - at->at_binstart) / binlimit;
1494                 LASSERT(shift > 0);
1495                 for(i = AT_BINS - 1; i >= 0; i--) {
1496                         if (i >= shift) {
1497                                 at->at_hist[i] = at->at_hist[i - shift];
1498                                 maxv = max(maxv, at->at_hist[i]);
1499                         } else {
1500                                 at->at_hist[i] = 0;
1501                         }
1502                 }
1503                 at->at_hist[0] = val;
1504                 at->at_current = maxv;
1505                 at->at_binstart += shift * binlimit;
1506         }
1507
1508         if (at->at_current > at->at_worst_ever) {
1509                 at->at_worst_ever = at->at_current;
1510                 at->at_worst_time = now;
1511         }
1512
1513         if (at->at_flags & AT_FLG_NOHIST)
1514                 /* Only keep last reported val; keeping the rest of the history
1515                    for proc only */
1516                 at->at_current = val;
1517
1518         if (at_max > 0)
1519                 at->at_current =  min(at->at_current, at_max);
1520         at->at_current =  max(at->at_current, at_min);
1521
1522         if (at->at_current != old)
1523                 CDEBUG(D_OTHER, "AT %p change: old=%u new=%u delta=%d "
1524                        "(val=%u) hist %u %u %u %u\n", at,
1525                        old, at->at_current, at->at_current - old, val,
1526                        at->at_hist[0], at->at_hist[1], at->at_hist[2],
1527                        at->at_hist[3]);
1528
1529         /* if we changed, report the old value */
1530         old = (at->at_current != old) ? old : 0;
1531
1532         spin_unlock(&at->at_lock);
1533         return old;
1534 }
1535
1536 /* Find the imp_at index for a given portal; assign if space available */
1537 int import_at_get_index(struct obd_import *imp, int portal)
1538 {
1539         struct imp_at *at = &imp->imp_at;
1540         int i;
1541
1542         for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1543                 if (at->iat_portal[i] == portal)
1544                         return i;
1545                 if (at->iat_portal[i] == 0)
1546                         /* unused */
1547                         break;
1548         }
1549
1550         /* Not found in list, add it under a lock */
1551         spin_lock(&imp->imp_lock);
1552
1553         /* Check unused under lock */
1554         for (; i < IMP_AT_MAX_PORTALS; i++) {
1555                 if (at->iat_portal[i] == portal)
1556                         goto out;
1557                 if (at->iat_portal[i] == 0)
1558                         /* unused */
1559                         break;
1560         }
1561
1562         /* Not enough portals? */
1563         LASSERT(i < IMP_AT_MAX_PORTALS);
1564
1565         at->iat_portal[i] = portal;
1566 out:
1567         spin_unlock(&imp->imp_lock);
1568         return i;
1569 }