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