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         cfs_spin_lock(&imp->imp_lock);          \
  88         IMPORT_SET_STATE_NOLOCK(imp, state);    \
  89         cfs_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         cfs_spin_lock(&imp->imp_lock);
 106
 107         imp->imp_generation++;
 108         imp->imp_state =  LUSTRE_IMP_NEW;
 109
 110         cfs_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         cfs_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                 cfs_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                 cfs_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         cfs_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         cfs_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         cfs_list_t *tmp, *n;
 248         struct ptlrpc_request *req;
 249         unsigned int timeout = 0;
 250
 251         cfs_spin_lock(&imp->imp_lock);
 252         cfs_list_for_each_safe(tmp, n, &imp->imp_sending_list) {
 253                 req = cfs_list_entry(tmp, struct ptlrpc_request, rq_list);
 254                 timeout = max(ptlrpc_inflight_deadline(req, now), timeout);
 255         }
 256         cfs_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         cfs_list_t *tmp, *n;
 269         struct ptlrpc_request *req;
 270         struct l_wait_info lwi;
 271         unsigned int timeout;
 272         int rc;
 273
 274         cfs_atomic_inc(&imp->imp_inval_count);
 275
 276         if (!imp->imp_invalid || imp->imp_obd->obd_no_recov)
 277                 ptlrpc_deactivate_import(imp);
 278
 279         LASSERT(imp->imp_invalid);
 280
 281         /* Wait forever until inflight == 0. We really can't do it another
 282          * way because in some cases we need to wait for very long reply
 283          * unlink. We can't do anything before that because there is really
 284          * no guarantee that some rdma transfer is not in progress right now. */
 285         do {
 286                 /* Calculate max timeout for waiting on rpcs to error
 287                  * out. Use obd_timeout if calculated value is smaller
 288                  * than it. */
 289                 if (!OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK)) {
 290                         timeout = ptlrpc_inflight_timeout(imp);
 291                         timeout += timeout / 3;
 292
 293                         if (timeout == 0)
 294                                 timeout = obd_timeout;
 295                 } else {
 296                         /* decrease the interval to increase race condition */
 297                         timeout = 1;
 298                 }
 299
 300                 CDEBUG(D_RPCTRACE,"Sleeping %d sec for inflight to error out\n",
 301                        timeout);
 302
 303                 /* Wait for all requests to error out and call completion
 304                  * callbacks. Cap it at obd_timeout -- these should all
 305                  * have been locally cancelled by ptlrpc_abort_inflight. */
 306                 lwi = LWI_TIMEOUT_INTERVAL(
 307                         cfs_timeout_cap(cfs_time_seconds(timeout)),
 308                         (timeout > 1)?cfs_time_seconds(1):cfs_time_seconds(1)/2,
 309                         NULL, NULL);
 310                 rc = l_wait_event(imp->imp_recovery_waitq,
 311                                   (cfs_atomic_read(&imp->imp_inflight) == 0),
 312                                   &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,
 318                                cfs_atomic_read(&imp->imp_inflight));
 319
 320                         cfs_spin_lock(&imp->imp_lock);
 321                         if (cfs_atomic_read(&imp->imp_inflight) == 0) {
 322                                 int count = cfs_atomic_read(&imp->imp_unregistering);
 323
 324                                 /* We know that "unregistering" rpcs only can
 325                                  * survive in sending or delaying lists (they
 326                                  * maybe waiting for long reply unlink in
 327                                  * sluggish nets). Let's check this. If there
 328                                  * is no inflight and unregistering != 0, this
 329                                  * is bug. */
 330                                 LASSERTF(count == 0, "Some RPCs are still "
 331                                          "unregistering: %d\n", count);
 332
 333                                 /* Let's save one loop as soon as inflight have
 334                                  * dropped to zero. No new inflights possible at
 335                                  * this point. */
 336                                 rc = 0;
 337                         } else {
 338                                 cfs_list_for_each_safe(tmp, n,
 339                                                        &imp->imp_sending_list) {
 340                                         req = cfs_list_entry(tmp,
 341                                                              struct ptlrpc_request,
 342                                                              rq_list);
 343                                         DEBUG_REQ(D_ERROR, req,
 344                                                   "still on sending list");
 345                                 }
 346                                 cfs_list_for_each_safe(tmp, n,
 347                                                        &imp->imp_delayed_list) {
 348                                         req = cfs_list_entry(tmp,
 349                                                              struct ptlrpc_request,
 350                                                              rq_list);
 351                                         DEBUG_REQ(D_ERROR, req,
 352                                                   "still on delayed list");
 353                                 }
 354
 355                                 CERROR("%s: RPCs in \"%s\" phase found (%d). "
 356                                        "Network is sluggish? Waiting them "
 357                                        "to error out.\n", cli_tgt,
 358                                        ptlrpc_phase2str(RQ_PHASE_UNREGISTERING),
 359                                        cfs_atomic_read(&imp->
 360                                                        imp_unregistering));
 361                         }
 362                         cfs_spin_unlock(&imp->imp_lock);
 363                   }
 364         } while (rc != 0);
 365
 366         /*
 367          * Let's additionally check that no new rpcs added to import in
 368          * "invalidate" state.
 369          */
 370         LASSERT(cfs_atomic_read(&imp->imp_inflight) == 0);
 371         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
 372         sptlrpc_import_flush_all_ctx(imp);
 373
 374         cfs_atomic_dec(&imp->imp_inval_count);
 375         cfs_waitq_broadcast(&imp->imp_recovery_waitq);
 376 }
 377
 378 /* unset imp_invalid */
 379 void ptlrpc_activate_import(struct obd_import *imp)
 380 {
 381         struct obd_device *obd = imp->imp_obd;
 382
 383         cfs_spin_lock(&imp->imp_lock);
 384         imp->imp_invalid = 0;
 385         ptlrpc_activate_timeouts(imp);
 386         cfs_spin_unlock(&imp->imp_lock);
 387         obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
 388 }
 389
 390 void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt)
 391 {
 392         ENTRY;
 393
 394         LASSERT(!imp->imp_dlm_fake);
 395
 396         if (ptlrpc_set_import_discon(imp, conn_cnt)) {
 397                 if (!imp->imp_replayable) {
 398                         CDEBUG(D_HA, "import %s@%s for %s not replayable, "
 399                                "auto-deactivating\n",
 400                                obd2cli_tgt(imp->imp_obd),
 401                                imp->imp_connection->c_remote_uuid.uuid,
 402                                imp->imp_obd->obd_name);
 403                         ptlrpc_deactivate_import(imp);
 404                 }
 405
 406                 CDEBUG(D_HA, "%s: waking up pinger\n",
 407                        obd2cli_tgt(imp->imp_obd));
 408
 409                 cfs_spin_lock(&imp->imp_lock);
 410                 imp->imp_force_verify = 1;
 411                 cfs_spin_unlock(&imp->imp_lock);
 412
 413                 ptlrpc_pinger_wake_up();
 414         }
 415         EXIT;
 416 }
 417
 418 int ptlrpc_reconnect_import(struct obd_import *imp)
 419 {
 420         ptlrpc_set_import_discon(imp, 0);
 421         /* Force a new connect attempt */
 422         ptlrpc_invalidate_import(imp);
 423         /* Do a fresh connect next time by zeroing the handle */
 424         ptlrpc_disconnect_import(imp, 1);
 425         /* Wait for all invalidate calls to finish */
 426         if (cfs_atomic_read(&imp->imp_inval_count) > 0) {
 427                 int rc;
 428                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
 429                 rc = l_wait_event(imp->imp_recovery_waitq,
 430                                   (cfs_atomic_read(&imp->imp_inval_count) == 0),
 431                                   &lwi);
 432                 if (rc)
 433                         CERROR("Interrupted, inval=%d\n",
 434                                cfs_atomic_read(&imp->imp_inval_count));
 435         }
 436
 437         /* Allow reconnect attempts */
 438         imp->imp_obd->obd_no_recov = 0;
 439         /* Remove 'invalid' flag */
 440         ptlrpc_activate_import(imp);
 441         /* Attempt a new connect */
 442         ptlrpc_recover_import(imp, NULL);
 443         return 0;
 444 }
 445
 446 EXPORT_SYMBOL(ptlrpc_reconnect_import);
 447
 448 static int import_select_connection(struct obd_import *imp)
 449 {
 450         struct obd_import_conn *imp_conn = NULL, *conn;
 451         struct obd_export *dlmexp;
 452         int tried_all = 1;
 453         ENTRY;
 454
 455         cfs_spin_lock(&imp->imp_lock);
 456
 457         if (cfs_list_empty(&imp->imp_conn_list)) {
 458                 CERROR("%s: no connections available\n",
 459                         imp->imp_obd->obd_name);
 460                 cfs_spin_unlock(&imp->imp_lock);
 461                 RETURN(-EINVAL);
 462         }
 463
 464         cfs_list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 465                 CDEBUG(D_HA, "%s: connect to NID %s last attempt "LPU64"\n",
 466                        imp->imp_obd->obd_name,
 467                        libcfs_nid2str(conn->oic_conn->c_peer.nid),
 468                        conn->oic_last_attempt);
 469                 /* Don't thrash connections */
 470                 if (cfs_time_before_64(cfs_time_current_64(),
 471                                      conn->oic_last_attempt +
 472                                      cfs_time_seconds(CONNECTION_SWITCH_MIN))) {
 473                         continue;
 474                 }
 475
 476                 /* If we have not tried this connection since
 477                    the last successful attempt, go with this one */
 478                 if ((conn->oic_last_attempt == 0) ||
 479                     cfs_time_beforeq_64(conn->oic_last_attempt,
 480                                        imp->imp_last_success_conn)) {
 481                         imp_conn = conn;
 482                         tried_all = 0;
 483                         break;
 484                 }
 485
 486                 /* If all of the connections have already been tried
 487                    since the last successful connection; just choose the
 488                    least recently used */
 489                 if (!imp_conn)
 490                         imp_conn = conn;
 491                 else if (cfs_time_before_64(conn->oic_last_attempt,
 492                                             imp_conn->oic_last_attempt))
 493                         imp_conn = conn;
 494         }
 495
 496         /* if not found, simply choose the current one */
 497         if (!imp_conn || imp->imp_force_reconnect) {
 498                 LASSERT(imp->imp_conn_current);
 499                 imp_conn = imp->imp_conn_current;
 500                 tried_all = 0;
 501         }
 502         LASSERT(imp_conn->oic_conn);
 503
 504         /* If we've tried everything, and we're back to the beginning of the
 505            list, increase our timeout and try again. It will be reset when
 506            we do finally connect. (FIXME: really we should wait for all network
 507            state associated with the last connection attempt to drain before
 508            trying to reconnect on it.) */
 509         if (tried_all && (imp->imp_conn_list.next == &imp_conn->oic_item)) {
 510                 if (at_get(&imp->imp_at.iat_net_latency) <
 511                     CONNECTION_SWITCH_MAX) {
 512                         at_measured(&imp->imp_at.iat_net_latency,
 513                                     at_get(&imp->imp_at.iat_net_latency) +
 514                                     CONNECTION_SWITCH_INC);
 515                 }
 516                 LASSERT(imp_conn->oic_last_attempt);
 517                 CWARN("%s: tried all connections, increasing latency to %ds\n",
 518                       imp->imp_obd->obd_name,
 519                       at_get(&imp->imp_at.iat_net_latency));
 520         }
 521
 522         imp_conn->oic_last_attempt = cfs_time_current_64();
 523
 524         /* switch connection, don't mind if it's same as the current one */
 525         if (imp->imp_connection)
 526                 ptlrpc_connection_put(imp->imp_connection);
 527         imp->imp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 528
 529         dlmexp =  class_conn2export(&imp->imp_dlm_handle);
 530         LASSERT(dlmexp != NULL);
 531         if (dlmexp->exp_connection)
 532                 ptlrpc_connection_put(dlmexp->exp_connection);
 533         dlmexp->exp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 534         class_export_put(dlmexp);
 535
 536         if (imp->imp_conn_current != imp_conn) {
 537                 if (imp->imp_conn_current)
 538                         CDEBUG(D_HA, "Changing connection for %s to %s/%s\n",
 539                                imp->imp_obd->obd_name, imp_conn->oic_uuid.uuid,
 540                                libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
 541                 imp->imp_conn_current = imp_conn;
 542         }
 543
 544         CDEBUG(D_HA, "%s: import %p using connection %s/%s\n",
 545                imp->imp_obd->obd_name, imp, imp_conn->oic_uuid.uuid,
 546                libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
 547
 548         cfs_spin_unlock(&imp->imp_lock);
 549
 550         RETURN(0);
 551 }
 552
 553 /*
 554  * must be called under imp_lock
 555  */
 556 static int ptlrpc_first_transno(struct obd_import *imp, __u64 *transno)
 557 {
 558         struct ptlrpc_request *req;
 559         cfs_list_t *tmp;
 560
 561         if (cfs_list_empty(&imp->imp_replay_list))
 562                 return 0;
 563         tmp = imp->imp_replay_list.next;
 564         req = cfs_list_entry(tmp, struct ptlrpc_request, rq_replay_list);
 565         *transno = req->rq_transno;
 566         if (req->rq_transno == 0) {
 567                 DEBUG_REQ(D_ERROR, req, "zero transno in replay");
 568                 LBUG();
 569         }
 570
 571         return 1;
 572 }
 573
 574 int ptlrpc_connect_import(struct obd_import *imp, char *new_uuid)
 575 {
 576         struct obd_device *obd = imp->imp_obd;
 577         int initial_connect = 0;
 578         int set_transno = 0;
 579         __u64 committed_before_reconnect = 0;
 580         struct ptlrpc_request *request;
 581         char *bufs[] = { NULL,
 582                          obd2cli_tgt(imp->imp_obd),
 583                          obd->obd_uuid.uuid,
 584                          (char *)&imp->imp_dlm_handle,
 585                          (char *)&imp->imp_connect_data };
 586         struct ptlrpc_connect_async_args *aa;
 587         int rc;
 588         ENTRY;
 589
 590         cfs_spin_lock(&imp->imp_lock);
 591         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 592                 cfs_spin_unlock(&imp->imp_lock);
 593                 CERROR("can't connect to a closed import\n");
 594                 RETURN(-EINVAL);
 595         } else if (imp->imp_state == LUSTRE_IMP_FULL) {
 596                 cfs_spin_unlock(&imp->imp_lock);
 597                 CERROR("already connected\n");
 598                 RETURN(0);
 599         } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
 600                 cfs_spin_unlock(&imp->imp_lock);
 601                 CERROR("already connecting\n");
 602                 RETURN(-EALREADY);
 603         }
 604
 605         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
 606
 607         imp->imp_conn_cnt++;
 608         imp->imp_resend_replay = 0;
 609
 610         if (!lustre_handle_is_used(&imp->imp_remote_handle))
 611                 initial_connect = 1;
 612         else
 613                 committed_before_reconnect = imp->imp_peer_committed_transno;
 614
 615         set_transno = ptlrpc_first_transno(imp,
 616                                            &imp->imp_connect_data.ocd_transno);
 617         cfs_spin_unlock(&imp->imp_lock);
 618
 619         if (new_uuid) {
 620                 struct obd_uuid uuid;
 621
 622                 obd_str2uuid(&uuid, new_uuid);
 623                 rc = import_set_conn_priority(imp, &uuid);
 624                 if (rc)
 625                         GOTO(out, rc);
 626         }
 627
 628         rc = import_select_connection(imp);
 629         if (rc)
 630                 GOTO(out, rc);
 631
 632         rc = sptlrpc_import_sec_adapt(imp, NULL, 0);
 633         if (rc)
 634                 GOTO(out, rc);
 635
 636         /* Reset connect flags to the originally requested flags, in case
 637          * the server is updated on-the-fly we will get the new features. */
 638         imp->imp_connect_data.ocd_connect_flags = imp->imp_connect_flags_orig;
 639         imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 640         imp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
 641
 642         rc = obd_reconnect(NULL, imp->imp_obd->obd_self_export, obd,
 643                            &obd->obd_uuid, &imp->imp_connect_data, NULL);
 644         if (rc)
 645                 GOTO(out, rc);
 646
 647         request = ptlrpc_request_alloc(imp, &RQF_MDS_CONNECT);
 648         if (request == NULL)
 649                 GOTO(out, rc = -ENOMEM);
 650
 651         rc = ptlrpc_request_bufs_pack(request, LUSTRE_OBD_VERSION,
 652                                       imp->imp_connect_op, bufs, NULL);
 653         if (rc) {
 654                 ptlrpc_request_free(request);
 655                 GOTO(out, rc);
 656         }
 657
 658         /* Report the rpc service time to the server so that it knows how long
 659          * to wait for clients to join recovery */
 660         lustre_msg_set_service_time(request->rq_reqmsg,
 661                                     at_timeout2est(request->rq_timeout));
 662
 663         /* The amount of time we give the server to process the connect req.
 664          * import_select_connection will increase the net latency on
 665          * repeated reconnect attempts to cover slow networks.
 666          * We override/ignore the server rpc completion estimate here,
 667          * which may be large if this is a reconnect attempt */
 668         request->rq_timeout = INITIAL_CONNECT_TIMEOUT;
 669         lustre_msg_set_timeout(request->rq_reqmsg, request->rq_timeout);
 670
 671 #ifndef __KERNEL__
 672         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_LIBCLIENT);
 673 #endif
 674         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_NEXT_VER);
 675
 676         request->rq_no_resend = request->rq_no_delay = 1;
 677         request->rq_send_state = LUSTRE_IMP_CONNECTING;
 678         /* Allow a slightly larger reply for future growth compatibility */
 679         req_capsule_set_size(&request->rq_pill, &RMF_CONNECT_DATA, RCL_SERVER,
 680                              sizeof(struct obd_connect_data)+16*sizeof(__u64));
 681         ptlrpc_request_set_replen(request);
 682         request->rq_interpret_reply = ptlrpc_connect_interpret;
 683
 684         CLASSERT(sizeof (*aa) <= sizeof (request->rq_async_args));
 685         aa = ptlrpc_req_async_args(request);
 686         memset(aa, 0, sizeof *aa);
 687
 688         aa->pcaa_peer_committed = committed_before_reconnect;
 689         aa->pcaa_initial_connect = initial_connect;
 690
 691         if (aa->pcaa_initial_connect) {
 692                 cfs_spin_lock(&imp->imp_lock);
 693                 imp->imp_replayable = 1;
 694                 cfs_spin_unlock(&imp->imp_lock);
 695                 lustre_msg_add_op_flags(request->rq_reqmsg,
 696                                         MSG_CONNECT_INITIAL);
 697         }
 698
 699         if (set_transno)
 700                 lustre_msg_add_op_flags(request->rq_reqmsg,
 701                                         MSG_CONNECT_TRANSNO);
 702
 703         DEBUG_REQ(D_RPCTRACE, request, "(re)connect request (timeout %d)",
 704                   request->rq_timeout);
 705         ptlrpcd_add_req(request, PSCOPE_OTHER);
 706         rc = 0;
 707 out:
 708         if (rc != 0) {
 709                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 710         }
 711
 712         RETURN(rc);
 713 }
 714 EXPORT_SYMBOL(ptlrpc_connect_import);
 715
 716 static void ptlrpc_maybe_ping_import_soon(struct obd_import *imp)
 717 {
 718 #ifdef __KERNEL__
 719         struct obd_import_conn *imp_conn;
 720 #endif
 721         int wake_pinger = 0;
 722
 723         ENTRY;
 724
 725         cfs_spin_lock(&imp->imp_lock);
 726         if (cfs_list_empty(&imp->imp_conn_list))
 727                 GOTO(unlock, 0);
 728
 729 #ifdef __KERNEL__
 730         imp_conn = cfs_list_entry(imp->imp_conn_list.prev,
 731                                   struct obd_import_conn,
 732                                   oic_item);
 733
 734         /* XXX: When the failover node is the primary node, it is possible
 735          * to have two identical connections in imp_conn_list. We must
 736          * compare not conn's pointers but NIDs, otherwise we can defeat
 737          * connection throttling. (See bug 14774.) */
 738         if (imp->imp_conn_current->oic_conn->c_peer.nid !=
 739                                 imp_conn->oic_conn->c_peer.nid) {
 740                 ptlrpc_ping_import_soon(imp);
 741                 wake_pinger = 1;
 742         }
 743 #else
 744         /* liblustre has no pinger thread, so we wakeup pinger anyway */
 745         wake_pinger = 1;
 746 #endif
 747
 748  unlock:
 749         cfs_spin_unlock(&imp->imp_lock);
 750
 751         if (wake_pinger)
 752                 ptlrpc_pinger_wake_up();
 753
 754         EXIT;
 755 }
 756
 757 static int ptlrpc_busy_reconnect(int rc)
 758 {
 759         return (rc == -EBUSY) || (rc == -EAGAIN);
 760 }
 761
 762
 763 static int ptlrpc_connect_interpret(const struct lu_env *env,
 764                                     struct ptlrpc_request *request,
 765                                     void *data, int rc)
 766 {
 767         struct ptlrpc_connect_async_args *aa = data;
 768         struct obd_import *imp = request->rq_import;
 769         struct client_obd *cli = &imp->imp_obd->u.cli;
 770         struct lustre_handle old_hdl;
 771         __u64 old_connect_flags;
 772         int msg_flags;
 773         ENTRY;
 774
 775         cfs_spin_lock(&imp->imp_lock);
 776         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 777                 cfs_spin_unlock(&imp->imp_lock);
 778                 RETURN(0);
 779         }
 780
 781         if (rc) {
 782                 /* if this reconnect to busy export - not need select new target
 783                  * for connecting*/
 784                 imp->imp_force_reconnect = ptlrpc_busy_reconnect(rc);
 785                 cfs_spin_unlock(&imp->imp_lock);
 786                 GOTO(out, rc);
 787         }
 788
 789         LASSERT(imp->imp_conn_current);
 790
 791         msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
 792
 793         /* All imports are pingable */
 794         imp->imp_pingable = 1;
 795         imp->imp_force_reconnect = 0;
 796
 797         if (aa->pcaa_initial_connect) {
 798                 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
 799                         imp->imp_replayable = 1;
 800                         cfs_spin_unlock(&imp->imp_lock);
 801                         CDEBUG(D_HA, "connected to replayable target: %s\n",
 802                                obd2cli_tgt(imp->imp_obd));
 803                 } else {
 804                         imp->imp_replayable = 0;
 805                         cfs_spin_unlock(&imp->imp_lock);
 806                 }
 807
 808                 /* if applies, adjust the imp->imp_msg_magic here
 809                  * according to reply flags */
 810
 811                 imp->imp_remote_handle =
 812                                 *lustre_msg_get_handle(request->rq_repmsg);
 813
 814                 /* Initial connects are allowed for clients with non-random
 815                  * uuids when servers are in recovery.  Simply signal the
 816                  * servers replay is complete and wait in REPLAY_WAIT. */
 817                 if (msg_flags & MSG_CONNECT_RECOVERING) {
 818                         CDEBUG(D_HA, "connect to %s during recovery\n",
 819                                obd2cli_tgt(imp->imp_obd));
 820                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
 821                 } else {
 822                         IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 823                         ptlrpc_activate_import(imp);
 824                 }
 825
 826                 GOTO(finish, rc = 0);
 827         } else {
 828                 cfs_spin_unlock(&imp->imp_lock);
 829         }
 830
 831         /* Determine what recovery state to move the import to. */
 832         if (MSG_CONNECT_RECONNECT & msg_flags) {
 833                 memset(&old_hdl, 0, sizeof(old_hdl));
 834                 if (!memcmp(&old_hdl, lustre_msg_get_handle(request->rq_repmsg),
 835                             sizeof (old_hdl))) {
 836                         CERROR("%s@%s didn't like our handle "LPX64
 837                                ", failed\n", obd2cli_tgt(imp->imp_obd),
 838                                imp->imp_connection->c_remote_uuid.uuid,
 839                                imp->imp_dlm_handle.cookie);
 840                         GOTO(out, rc = -ENOTCONN);
 841                 }
 842
 843                 if (memcmp(&imp->imp_remote_handle,
 844                            lustre_msg_get_handle(request->rq_repmsg),
 845                            sizeof(imp->imp_remote_handle))) {
 846                         int level = msg_flags & MSG_CONNECT_RECOVERING ?
 847                                 D_HA : D_WARNING;
 848
 849                         /* Bug 16611/14775: if server handle have changed,
 850                          * that means some sort of disconnection happened.
 851                          * If the server is not in recovery, that also means it
 852                          * already erased all of our state because of previous
 853                          * eviction. If it is in recovery - we are safe to
 854                          * participate since we can reestablish all of our state
 855                          * with server again */
 856                         CDEBUG(level,"%s@%s changed server handle from "
 857                                      LPX64" to "LPX64"%s\n",
 858                                      obd2cli_tgt(imp->imp_obd),
 859                                      imp->imp_connection->c_remote_uuid.uuid,
 860                                      imp->imp_remote_handle.cookie,
 861                                      lustre_msg_get_handle(request->rq_repmsg)->
 862                                                                         cookie,
 863                                      (MSG_CONNECT_RECOVERING & msg_flags) ?
 864                                          " but is still in recovery" : "");
 865
 866                         imp->imp_remote_handle =
 867                                      *lustre_msg_get_handle(request->rq_repmsg);
 868
 869                         if (!(MSG_CONNECT_RECOVERING & msg_flags)) {
 870                                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 871                                 GOTO(finish, rc = 0);
 872                         }
 873
 874                 } else {
 875                         CDEBUG(D_HA, "reconnected to %s@%s after partition\n",
 876                                obd2cli_tgt(imp->imp_obd),
 877                                imp->imp_connection->c_remote_uuid.uuid);
 878                 }
 879
 880                 if (imp->imp_invalid) {
 881                         CDEBUG(D_HA, "%s: reconnected but import is invalid; "
 882                                "marking evicted\n", imp->imp_obd->obd_name);
 883                         IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 884                 } else if (MSG_CONNECT_RECOVERING & msg_flags) {
 885                         CDEBUG(D_HA, "%s: reconnected to %s during replay\n",
 886                                imp->imp_obd->obd_name,
 887                                obd2cli_tgt(imp->imp_obd));
 888
 889                         cfs_spin_lock(&imp->imp_lock);
 890                         imp->imp_resend_replay = 1;
 891                         cfs_spin_unlock(&imp->imp_lock);
 892
 893                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 894                 } else {
 895                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 896                 }
 897         } else if ((MSG_CONNECT_RECOVERING & msg_flags) && !imp->imp_invalid) {
 898                 LASSERT(imp->imp_replayable);
 899                 imp->imp_remote_handle =
 900                                 *lustre_msg_get_handle(request->rq_repmsg);
 901                 imp->imp_last_replay_transno = 0;
 902                 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 903         } else {
 904                 DEBUG_REQ(D_HA, request, "%s: evicting (reconnect/recover flags"
 905                           " not set: %x)", imp->imp_obd->obd_name, msg_flags);
 906                 imp->imp_remote_handle =
 907                                 *lustre_msg_get_handle(request->rq_repmsg);
 908                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 909         }
 910
 911         /* Sanity checks for a reconnected import. */
 912         if (!(imp->imp_replayable) != !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
 913                 CERROR("imp_replayable flag does not match server "
 914                        "after reconnect. We should LBUG right here.\n");
 915         }
 916
 917         if (lustre_msg_get_last_committed(request->rq_repmsg) > 0 &&
 918             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                 cfs_spin_lock(&imp->imp_lock);
 950                 cfs_list_del(&imp->imp_conn_current->oic_item);
 951                 cfs_list_add(&imp->imp_conn_current->oic_item,
 952                              &imp->imp_conn_list);
 953                 imp->imp_last_success_conn =
 954                         imp->imp_conn_current->oic_last_attempt;
 955
 956                 if (ocd == NULL) {
 957                         cfs_spin_unlock(&imp->imp_lock);
 958                         CERROR("Wrong connect data from server\n");
 959                         rc = -EPROTO;
 960                         GOTO(out, rc);
 961                 }
 962
 963                 imp->imp_connect_data = *ocd;
 964
 965                 exp = class_conn2export(&imp->imp_dlm_handle);
 966                 cfs_spin_unlock(&imp->imp_lock);
 967
 968                 /* check that server granted subset of flags we asked for. */
 969                 LASSERTF((ocd->ocd_connect_flags &
 970                           imp->imp_connect_flags_orig) ==
 971                          ocd->ocd_connect_flags, LPX64" != "LPX64,
 972                          imp->imp_connect_flags_orig, ocd->ocd_connect_flags);
 973
 974                 if (!exp) {
 975                         /* This could happen if export is cleaned during the
 976                            connect attempt */
 977                         CERROR("Missing export for %s\n",
 978                                imp->imp_obd->obd_name);
 979                         GOTO(out, rc = -ENODEV);
 980                 }
 981                 old_connect_flags = exp->exp_connect_flags;
 982                 exp->exp_connect_flags = ocd->ocd_connect_flags;
 983                 imp->imp_obd->obd_self_export->exp_connect_flags =
 984                                                         ocd->ocd_connect_flags;
 985                 class_export_put(exp);
 986
 987                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_OCD);
 988
 989                 if (!ocd->ocd_ibits_known &&
 990                     ocd->ocd_connect_flags & OBD_CONNECT_IBITS)
 991                         CERROR("Inodebits aware server returned zero compatible"
 992                                " bits?\n");
 993
 994                 if ((ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
 995                     (ocd->ocd_version > LUSTRE_VERSION_CODE +
 996                                         LUSTRE_VERSION_OFFSET_WARN ||
 997                      ocd->ocd_version < LUSTRE_VERSION_CODE -
 998                                         LUSTRE_VERSION_OFFSET_WARN)) {
 999                         /* Sigh, some compilers do not like #ifdef in the middle
1000                            of macro arguments */
1001 #ifdef __KERNEL__
1002                         const char *older =
1003                                 "older. Consider upgrading this client";
1004 #else
1005                         const char *older =
1006                                 "older. Consider recompiling this application";
1007 #endif
1008                         const char *newer = "newer than client version";
1009
1010                         LCONSOLE_WARN("Server %s version (%d.%d.%d.%d) "
1011                                       "is much %s (%s)\n",
1012                                       obd2cli_tgt(imp->imp_obd),
1013                                       OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
1014                                       OBD_OCD_VERSION_MINOR(ocd->ocd_version),
1015                                       OBD_OCD_VERSION_PATCH(ocd->ocd_version),
1016                                       OBD_OCD_VERSION_FIX(ocd->ocd_version),
1017                                       ocd->ocd_version > LUSTRE_VERSION_CODE ?
1018                                       newer : older, LUSTRE_VERSION_STRING);
1019                 }
1020
1021                 if (ocd->ocd_connect_flags & OBD_CONNECT_CKSUM) {
1022                         /* We sent to the server ocd_cksum_types with bits set
1023                          * for algorithms we understand. The server masked off
1024                          * the checksum types it doesn't support */
1025                         if ((ocd->ocd_cksum_types & OBD_CKSUM_ALL) == 0) {
1026                                 LCONSOLE_WARN("The negotiation of the checksum "
1027                                               "alogrithm to use with server %s "
1028                                               "failed (%x/%x), disabling "
1029                                               "checksums\n",
1030                                               obd2cli_tgt(imp->imp_obd),
1031                                               ocd->ocd_cksum_types,
1032                                               OBD_CKSUM_ALL);
1033                                 cli->cl_checksum = 0;
1034                                 cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
1035                                 cli->cl_cksum_type = OBD_CKSUM_CRC32;
1036                         } else {
1037                                 cli->cl_supp_cksum_types = ocd->ocd_cksum_types;
1038
1039                                 if (ocd->ocd_cksum_types & OSC_DEFAULT_CKSUM)
1040                                         cli->cl_cksum_type = OSC_DEFAULT_CKSUM;
1041                                 else if (ocd->ocd_cksum_types & OBD_CKSUM_ADLER)
1042                                         cli->cl_cksum_type = OBD_CKSUM_ADLER;
1043                                 else
1044                                         cli->cl_cksum_type = OBD_CKSUM_CRC32;
1045                         }
1046                 } else {
1047                         /* The server does not support OBD_CONNECT_CKSUM.
1048                          * Enforce CRC32 for backward compatibility*/
1049                         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
1050                         cli->cl_cksum_type = OBD_CKSUM_CRC32;
1051                 }
1052
1053                 if (ocd->ocd_connect_flags & OBD_CONNECT_BRW_SIZE) {
1054                         cli->cl_max_pages_per_rpc =
1055                                 ocd->ocd_brw_size >> CFS_PAGE_SHIFT;
1056                 }
1057
1058                 /* Reset ns_connect_flags only for initial connect. It might be
1059                  * changed in while using FS and if we reset it in reconnect
1060                  * this leads to losing user settings done before such as
1061                  * disable lru_resize, etc. */
1062                 if (old_connect_flags != exp->exp_connect_flags ||
1063                     aa->pcaa_initial_connect) {
1064                         CDEBUG(D_HA, "%s: Resetting ns_connect_flags to server "
1065                                "flags: "LPX64"\n", imp->imp_obd->obd_name,
1066                               ocd->ocd_connect_flags);
1067                         imp->imp_obd->obd_namespace->ns_connect_flags =
1068                                 ocd->ocd_connect_flags;
1069                         imp->imp_obd->obd_namespace->ns_orig_connect_flags =
1070                                 ocd->ocd_connect_flags;
1071                 }
1072
1073                 if ((ocd->ocd_connect_flags & OBD_CONNECT_AT) &&
1074                     (imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
1075                         /* We need a per-message support flag, because
1076                            a. we don't know if the incoming connect reply
1077                               supports AT or not (in reply_in_callback)
1078                               until we unpack it.
1079                            b. failovered server means export and flags are gone
1080                               (in ptlrpc_send_reply).
1081                            Can only be set when we know AT is supported at
1082                            both ends */
1083                         imp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1084                 else
1085                         imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1086
1087                 if ((ocd->ocd_connect_flags & OBD_CONNECT_FULL20) &&
1088                     (imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
1089                         imp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
1090                 else
1091                         imp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
1092
1093                 LASSERT((cli->cl_max_pages_per_rpc <= PTLRPC_MAX_BRW_PAGES) &&
1094                         (cli->cl_max_pages_per_rpc > 0));
1095         }
1096
1097 out:
1098         if (rc != 0) {
1099                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
1100                 if (rc == -EACCES) {
1101                         /*
1102                          * Give up trying to reconnect
1103                          * EACCES means client has no permission for connection
1104                          */
1105                         imp->imp_obd->obd_no_recov = 1;
1106                         ptlrpc_deactivate_import(imp);
1107                 }
1108
1109                 if (rc == -EPROTO) {
1110                         struct obd_connect_data *ocd;
1111
1112                         /* reply message might not be ready */
1113                         if (request->rq_repmsg == NULL)
1114                                 RETURN(-EPROTO);
1115
1116                         ocd = req_capsule_server_get(&request->rq_pill,
1117                                                      &RMF_CONNECT_DATA);
1118                         if (ocd &&
1119                             (ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
1120                             (ocd->ocd_version != LUSTRE_VERSION_CODE)) {
1121                            /* Actually servers are only supposed to refuse
1122                               connection from liblustre clients, so we should
1123                               never see this from VFS context */
1124                                 LCONSOLE_ERROR_MSG(0x16a, "Server %s version "
1125                                         "(%d.%d.%d.%d)"
1126                                         " refused connection from this client "
1127                                         "with an incompatible version (%s).  "
1128                                         "Client must be recompiled\n",
1129                                         obd2cli_tgt(imp->imp_obd),
1130                                         OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
1131                                         OBD_OCD_VERSION_MINOR(ocd->ocd_version),
1132                                         OBD_OCD_VERSION_PATCH(ocd->ocd_version),
1133                                         OBD_OCD_VERSION_FIX(ocd->ocd_version),
1134                                         LUSTRE_VERSION_STRING);
1135                                 ptlrpc_deactivate_import(imp);
1136                                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CLOSED);
1137                         }
1138                         RETURN(-EPROTO);
1139                 }
1140
1141                 ptlrpc_maybe_ping_import_soon(imp);
1142
1143                 CDEBUG(D_HA, "recovery of %s on %s failed (%d)\n",
1144                        obd2cli_tgt(imp->imp_obd),
1145                        (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
1146         }
1147
1148         cfs_waitq_broadcast(&imp->imp_recovery_waitq);
1149         RETURN(rc);
1150 }
1151
1152 static int completed_replay_interpret(const struct lu_env *env,
1153                                       struct ptlrpc_request *req,
1154                                       void * data, int rc)
1155 {
1156         ENTRY;
1157         cfs_atomic_dec(&req->rq_import->imp_replay_inflight);
1158         if (req->rq_status == 0 &&
1159             !req->rq_import->imp_vbr_failed) {
1160                 ptlrpc_import_recovery_state_machine(req->rq_import);
1161         } else {
1162                 if (req->rq_import->imp_vbr_failed) {
1163                         CDEBUG(D_WARNING,
1164                                "%s: version recovery fails, reconnecting\n",
1165                                req->rq_import->imp_obd->obd_name);
1166                 } else {
1167                         CDEBUG(D_HA, "%s: LAST_REPLAY message error: %d, "
1168                                      "reconnecting\n",
1169                                req->rq_import->imp_obd->obd_name,
1170                                req->rq_status);
1171                 }
1172                 ptlrpc_connect_import(req->rq_import, NULL);
1173         }
1174
1175         RETURN(0);
1176 }
1177
1178 static int signal_completed_replay(struct obd_import *imp)
1179 {
1180         struct ptlrpc_request *req;
1181         ENTRY;
1182
1183         LASSERT(cfs_atomic_read(&imp->imp_replay_inflight) == 0);
1184         cfs_atomic_inc(&imp->imp_replay_inflight);
1185
1186         req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING, LUSTRE_OBD_VERSION,
1187                                         OBD_PING);
1188         if (req == NULL) {
1189                 cfs_atomic_dec(&imp->imp_replay_inflight);
1190                 RETURN(-ENOMEM);
1191         }
1192
1193         ptlrpc_request_set_replen(req);
1194         req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
1195         lustre_msg_add_flags(req->rq_reqmsg,
1196                              MSG_LOCK_REPLAY_DONE | MSG_REQ_REPLAY_DONE);
1197         if (AT_OFF)
1198                 req->rq_timeout *= 3;
1199         req->rq_interpret_reply = completed_replay_interpret;
1200
1201         ptlrpcd_add_req(req, PSCOPE_OTHER);
1202         RETURN(0);
1203 }
1204
1205 #ifdef __KERNEL__
1206 static int ptlrpc_invalidate_import_thread(void *data)
1207 {
1208         struct obd_import *imp = data;
1209
1210         ENTRY;
1211
1212         cfs_daemonize_ctxt("ll_imp_inval");
1213
1214         CDEBUG(D_HA, "thread invalidate import %s to %s@%s\n",
1215                imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
1216                imp->imp_connection->c_remote_uuid.uuid);
1217
1218         ptlrpc_invalidate_import(imp);
1219
1220         if (obd_dump_on_eviction) {
1221                 CERROR("dump the log upon eviction\n");
1222                 libcfs_debug_dumplog();
1223         }
1224
1225         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1226         ptlrpc_import_recovery_state_machine(imp);
1227
1228         class_import_put(imp);
1229         RETURN(0);
1230 }
1231 #endif
1232
1233 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
1234 {
1235         int rc = 0;
1236         int inflight;
1237         char *target_start;
1238         int target_len;
1239
1240         ENTRY;
1241         if (imp->imp_state == LUSTRE_IMP_EVICTED) {
1242                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1243                           &target_start, &target_len);
1244                 /* Don't care about MGC eviction */
1245                 if (strcmp(imp->imp_obd->obd_type->typ_name,
1246                            LUSTRE_MGC_NAME) != 0) {
1247                         LCONSOLE_ERROR_MSG(0x167, "This client was evicted by "
1248                                            "%.*s; in progress operations using "
1249                                            "this service will fail.\n",
1250                                            target_len, target_start);
1251                 }
1252                 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
1253                        obd2cli_tgt(imp->imp_obd),
1254                        imp->imp_connection->c_remote_uuid.uuid);
1255                 /* reset vbr_failed flag upon eviction */
1256                 cfs_spin_lock(&imp->imp_lock);
1257                 imp->imp_vbr_failed = 0;
1258                 cfs_spin_unlock(&imp->imp_lock);
1259
1260 #ifdef __KERNEL__
1261                 /* bug 17802:  XXX client_disconnect_export vs connect request
1262                  * race. if client will evicted at this time, we start
1263                  * invalidate thread without reference to import and import can
1264                  * be freed at same time. */
1265                 class_import_get(imp);
1266                 rc = cfs_kernel_thread(ptlrpc_invalidate_import_thread, imp,
1267                                        CLONE_VM | CLONE_FILES);
1268                 if (rc < 0) {
1269                         class_import_put(imp);
1270                         CERROR("error starting invalidate thread: %d\n", rc);
1271                 } else {
1272                         rc = 0;
1273                 }
1274                 RETURN(rc);
1275 #else
1276                 ptlrpc_invalidate_import(imp);
1277
1278                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1279 #endif
1280         }
1281
1282         if (imp->imp_state == LUSTRE_IMP_REPLAY) {
1283                 CDEBUG(D_HA, "replay requested by %s\n",
1284                        obd2cli_tgt(imp->imp_obd));
1285                 rc = ptlrpc_replay_next(imp, &inflight);
1286                 if (inflight == 0 &&
1287                     cfs_atomic_read(&imp->imp_replay_inflight) == 0) {
1288                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
1289                         rc = ldlm_replay_locks(imp);
1290                         if (rc)
1291                                 GOTO(out, rc);
1292                 }
1293                 rc = 0;
1294         }
1295
1296         if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
1297                 if (cfs_atomic_read(&imp->imp_replay_inflight) == 0) {
1298                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
1299                         rc = signal_completed_replay(imp);
1300                         if (rc)
1301                                 GOTO(out, rc);
1302                 }
1303
1304         }
1305
1306         if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
1307                 if (cfs_atomic_read(&imp->imp_replay_inflight) == 0) {
1308                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1309                 }
1310         }
1311
1312         if (imp->imp_state == LUSTRE_IMP_RECOVER) {
1313                 CDEBUG(D_HA, "reconnected to %s@%s\n",
1314                        obd2cli_tgt(imp->imp_obd),
1315                        imp->imp_connection->c_remote_uuid.uuid);
1316
1317                 rc = ptlrpc_resend(imp);
1318                 if (rc)
1319                         GOTO(out, rc);
1320                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
1321                 ptlrpc_activate_import(imp);
1322
1323                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1324                           &target_start, &target_len);
1325                 LCONSOLE_INFO("%s: Connection restored to service %.*s "
1326                               "using nid %s.\n", imp->imp_obd->obd_name,
1327                               target_len, target_start,
1328                               libcfs_nid2str(imp->imp_connection->c_peer.nid));
1329         }
1330
1331         if (imp->imp_state == LUSTRE_IMP_FULL) {
1332                 cfs_waitq_broadcast(&imp->imp_recovery_waitq);
1333                 ptlrpc_wake_delayed(imp);
1334         }
1335
1336 out:
1337         RETURN(rc);
1338 }
1339
1340 int ptlrpc_disconnect_import(struct obd_import *imp, int noclose)
1341 {
1342         struct ptlrpc_request *req;
1343         int rq_opc, rc = 0;
1344         int nowait = imp->imp_obd->obd_force;
1345         ENTRY;
1346
1347         if (nowait)
1348                 GOTO(set_state, rc);
1349
1350         switch (imp->imp_connect_op) {
1351         case OST_CONNECT: rq_opc = OST_DISCONNECT; break;
1352         case MDS_CONNECT: rq_opc = MDS_DISCONNECT; break;
1353         case MGS_CONNECT: rq_opc = MGS_DISCONNECT; break;
1354         default:
1355                 CERROR("don't know how to disconnect from %s (connect_op %d)\n",
1356                        obd2cli_tgt(imp->imp_obd), imp->imp_connect_op);
1357                 RETURN(-EINVAL);
1358         }
1359
1360         if (ptlrpc_import_in_recovery(imp)) {
1361                 struct l_wait_info lwi;
1362                 cfs_duration_t timeout;
1363
1364
1365                 if (AT_OFF) {
1366                         if (imp->imp_server_timeout)
1367                                 timeout = cfs_time_seconds(obd_timeout / 2);
1368                         else
1369                                 timeout = cfs_time_seconds(obd_timeout);
1370                 } else {
1371                         int idx = import_at_get_index(imp,
1372                                 imp->imp_client->cli_request_portal);
1373                         timeout = cfs_time_seconds(
1374                                 at_get(&imp->imp_at.iat_service_estimate[idx]));
1375                 }
1376
1377                 lwi = LWI_TIMEOUT_INTR(cfs_timeout_cap(timeout),
1378                                        back_to_sleep, LWI_ON_SIGNAL_NOOP, NULL);
1379                 rc = l_wait_event(imp->imp_recovery_waitq,
1380                                   !ptlrpc_import_in_recovery(imp), &lwi);
1381
1382         }
1383
1384         cfs_spin_lock(&imp->imp_lock);
1385         if (imp->imp_state != LUSTRE_IMP_FULL)
1386                 GOTO(out, 0);
1387
1388         cfs_spin_unlock(&imp->imp_lock);
1389
1390         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_DISCONNECT,
1391                                         LUSTRE_OBD_VERSION, rq_opc);
1392         if (req) {
1393                 /* We are disconnecting, do not retry a failed DISCONNECT rpc if
1394                  * it fails.  We can get through the above with a down server
1395                  * if the client doesn't know the server is gone yet. */
1396                 req->rq_no_resend = 1;
1397
1398 #ifndef CRAY_XT3
1399                 /* We want client umounts to happen quickly, no matter the
1400                    server state... */
1401                 req->rq_timeout = min_t(int, req->rq_timeout,
1402                                         INITIAL_CONNECT_TIMEOUT);
1403 #else
1404                 /* ... but we always want liblustre clients to nicely
1405                    disconnect, so only use the adaptive value. */
1406                 if (AT_OFF)
1407                         req->rq_timeout = obd_timeout / 3;
1408 #endif
1409
1410                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
1411                 req->rq_send_state =  LUSTRE_IMP_CONNECTING;
1412                 ptlrpc_request_set_replen(req);
1413                 rc = ptlrpc_queue_wait(req);
1414                 ptlrpc_req_finished(req);
1415         }
1416
1417 set_state:
1418         cfs_spin_lock(&imp->imp_lock);
1419 out:
1420         if (noclose)
1421                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
1422         else
1423                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
1424         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
1425         cfs_spin_unlock(&imp->imp_lock);
1426
1427         RETURN(rc);
1428 }
1429
1430 void ptlrpc_cleanup_imp(struct obd_import *imp)
1431 {
1432         ENTRY;
1433
1434         cfs_spin_lock(&imp->imp_lock);
1435         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
1436         imp->imp_generation++;
1437         cfs_spin_unlock(&imp->imp_lock);
1438         ptlrpc_abort_inflight(imp);
1439
1440         EXIT;
1441 }
1442
1443 /* Adaptive Timeout utils */
1444 extern unsigned int at_min, at_max, at_history;
1445
1446 /* Bin into timeslices using AT_BINS bins.
1447    This gives us a max of the last binlimit*AT_BINS secs without the storage,
1448    but still smoothing out a return to normalcy from a slow response.
1449    (E.g. remember the maximum latency in each minute of the last 4 minutes.) */
1450 int at_measured(struct adaptive_timeout *at, unsigned int val)
1451 {
1452         unsigned int old = at->at_current;
1453         time_t now = cfs_time_current_sec();
1454         time_t binlimit = max_t(time_t, at_history / AT_BINS, 1);
1455
1456         LASSERT(at);
1457         CDEBUG(D_OTHER, "add %u to %p time=%lu v=%u (%u %u %u %u)\n",
1458                val, at, now - at->at_binstart, at->at_current,
1459                at->at_hist[0], at->at_hist[1], at->at_hist[2], at->at_hist[3]);
1460
1461         if (val == 0)
1462                 /* 0's don't count, because we never want our timeout to
1463                    drop to 0, and because 0 could mean an error */
1464                 return 0;
1465
1466         cfs_spin_lock(&at->at_lock);
1467
1468         if (unlikely(at->at_binstart == 0)) {
1469                 /* Special case to remove default from history */
1470                 at->at_current = val;
1471                 at->at_worst_ever = val;
1472                 at->at_worst_time = now;
1473                 at->at_hist[0] = val;
1474                 at->at_binstart = now;
1475         } else if (now - at->at_binstart < binlimit ) {
1476                 /* in bin 0 */
1477                 at->at_hist[0] = max(val, at->at_hist[0]);
1478                 at->at_current = max(val, at->at_current);
1479         } else {
1480                 int i, shift;
1481                 unsigned int maxv = val;
1482                 /* move bins over */
1483                 shift = (now - at->at_binstart) / binlimit;
1484                 LASSERT(shift > 0);
1485                 for(i = AT_BINS - 1; i >= 0; i--) {
1486                         if (i >= shift) {
1487                                 at->at_hist[i] = at->at_hist[i - shift];
1488                                 maxv = max(maxv, at->at_hist[i]);
1489                         } else {
1490                                 at->at_hist[i] = 0;
1491                         }
1492                 }
1493                 at->at_hist[0] = val;
1494                 at->at_current = maxv;
1495                 at->at_binstart += shift * binlimit;
1496         }
1497
1498         if (at->at_current > at->at_worst_ever) {
1499                 at->at_worst_ever = at->at_current;
1500                 at->at_worst_time = now;
1501         }
1502
1503         if (at->at_flags & AT_FLG_NOHIST)
1504                 /* Only keep last reported val; keeping the rest of the history
1505                    for proc only */
1506                 at->at_current = val;
1507
1508         if (at_max > 0)
1509                 at->at_current =  min(at->at_current, at_max);
1510         at->at_current =  max(at->at_current, at_min);
1511
1512         if (at->at_current != old)
1513                 CDEBUG(D_OTHER, "AT %p change: old=%u new=%u delta=%d "
1514                        "(val=%u) hist %u %u %u %u\n", at,
1515                        old, at->at_current, at->at_current - old, val,
1516                        at->at_hist[0], at->at_hist[1], at->at_hist[2],
1517                        at->at_hist[3]);
1518
1519         /* if we changed, report the old value */
1520         old = (at->at_current != old) ? old : 0;
1521
1522         cfs_spin_unlock(&at->at_lock);
1523         return old;
1524 }
1525
1526 /* Find the imp_at index for a given portal; assign if space available */
1527 int import_at_get_index(struct obd_import *imp, int portal)
1528 {
1529         struct imp_at *at = &imp->imp_at;
1530         int i;
1531
1532         for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1533                 if (at->iat_portal[i] == portal)
1534                         return i;
1535                 if (at->iat_portal[i] == 0)
1536                         /* unused */
1537                         break;
1538         }
1539
1540         /* Not found in list, add it under a lock */
1541         cfs_spin_lock(&imp->imp_lock);
1542
1543         /* Check unused under lock */
1544         for (; i < IMP_AT_MAX_PORTALS; i++) {
1545                 if (at->iat_portal[i] == portal)
1546                         goto out;
1547                 if (at->iat_portal[i] == 0)
1548                         /* unused */
1549                         break;
1550         }
1551
1552         /* Not enough portals? */
1553         LASSERT(i < IMP_AT_MAX_PORTALS);
1554
1555         at->iat_portal[i] = portal;
1556 out:
1557         cfs_spin_unlock(&imp->imp_lock);
1558         return i;
1559 }