lustre/ptlrpc/import.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2002, 2003 Cluster File Systems, Inc.
   5  *   Author: Mike Shaver <shaver@clusterfs.com>
   6  *
   7  *   This file is part of the Lustre file system, http://www.lustre.org
   8  *   Lustre is a trademark of Cluster File Systems, Inc.
   9  *
  10  *   You may have signed or agreed to another license before downloading
  11  *   this software.  If so, you are bound by the terms and conditions
  12  *   of that agreement, and the following does not apply to you.  See the
  13  *   LICENSE file included with this distribution for more information.
  14  *
  15  *   If you did not agree to a different license, then this copy of Lustre
  16  *   is open source software; you can redistribute it and/or modify it
  17  *   under the terms of version 2 of the GNU General Public License as
  18  *   published by the Free Software Foundation.
  19  *
  20  *   In either case, Lustre is distributed in the hope that it will be
  21  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  22  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *   license text for more details.
  24  */
  25
  26 #define DEBUG_SUBSYSTEM S_RPC
  27 #ifndef __KERNEL__
  28 # include <liblustre.h>
  29 #endif
  30
  31 #include <obd_support.h>
  32 #include <lustre_ha.h>
  33 #include <lustre_net.h>
  34 #include <lustre_import.h>
  35 #include <lustre_export.h>
  36 #include <obd.h>
  37 #include <obd_cksum.h>
  38 #include <obd_class.h>
  39
  40 #include "ptlrpc_internal.h"
  41
  42 struct ptlrpc_connect_async_args {
  43          __u64 pcaa_peer_committed;
  44         int pcaa_initial_connect;
  45 };
  46
  47 /* A CLOSED import should remain so. */
  48 #define IMPORT_SET_STATE_NOLOCK(imp, state)                                    \
  49 do {                                                                           \
  50         if (imp->imp_state != LUSTRE_IMP_CLOSED) {                             \
  51                CDEBUG(D_HA, "%p %s: changing import state from %s to %s\n",    \
  52                       imp, obd2cli_tgt(imp->imp_obd),                          \
  53                       ptlrpc_import_state_name(imp->imp_state),                \
  54                       ptlrpc_import_state_name(state));                        \
  55                imp->imp_state = state;                                         \
  56         }                                                                      \
  57 } while(0)
  58
  59 #define IMPORT_SET_STATE(imp, state)            \
  60 do {                                            \
  61         spin_lock(&imp->imp_lock);              \
  62         IMPORT_SET_STATE_NOLOCK(imp, state);    \
  63         spin_unlock(&imp->imp_lock);            \
  64 } while(0)
  65
  66
  67 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
  68                                     void * data, int rc);
  69 int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
  70
  71 /* Only this function is allowed to change the import state when it is
  72  * CLOSED. I would rather refcount the import and free it after
  73  * disconnection like we do with exports. To do that, the client_obd
  74  * will need to save the peer info somewhere other than in the import,
  75  * though. */
  76 int ptlrpc_init_import(struct obd_import *imp)
  77 {
  78         spin_lock(&imp->imp_lock);
  79
  80         imp->imp_generation++;
  81         imp->imp_state =  LUSTRE_IMP_NEW;
  82
  83         spin_unlock(&imp->imp_lock);
  84
  85         return 0;
  86 }
  87 EXPORT_SYMBOL(ptlrpc_init_import);
  88
  89 #define UUID_STR "_UUID"
  90 static void deuuidify(char *uuid, const char *prefix, char **uuid_start,
  91                       int *uuid_len)
  92 {
  93         *uuid_start = !prefix || strncmp(uuid, prefix, strlen(prefix))
  94                 ? uuid : uuid + strlen(prefix);
  95
  96         *uuid_len = strlen(*uuid_start);
  97
  98         if (*uuid_len < strlen(UUID_STR))
  99                 return;
 100
 101         if (!strncmp(*uuid_start + *uuid_len - strlen(UUID_STR),
 102                     UUID_STR, strlen(UUID_STR)))
 103                 *uuid_len -= strlen(UUID_STR);
 104 }
 105
 106 /* Returns true if import was FULL, false if import was already not
 107  * connected.
 108  * @imp - import to be disconnected
 109  * @conn_cnt - connection count (epoch) of the request that timed out
 110  *             and caused the disconnection.  In some cases, multiple
 111  *             inflight requests can fail to a single target (e.g. OST
 112  *             bulk requests) and if one has already caused a reconnection
 113  *             (increasing the import->conn_cnt) the older failure should
 114  *             not also cause a reconnection.  If zero it forces a reconnect.
 115  */
 116 int ptlrpc_set_import_discon(struct obd_import *imp, __u32 conn_cnt)
 117 {
 118         int rc = 0;
 119
 120         spin_lock(&imp->imp_lock);
 121
 122         if (imp->imp_state == LUSTRE_IMP_FULL &&
 123             (conn_cnt == 0 || conn_cnt == imp->imp_conn_cnt)) {
 124                 char *target_start;
 125                 int   target_len;
 126
 127                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
 128                           &target_start, &target_len);
 129
 130                 if (imp->imp_replayable) {
 131                         LCONSOLE_WARN("%s: Connection to service %.*s via nid "
 132                                "%s was lost; in progress operations using this "
 133                                "service will wait for recovery to complete.\n",
 134                                imp->imp_obd->obd_name, target_len, target_start,
 135                                libcfs_nid2str(imp->imp_connection->c_peer.nid));
 136                 } else {
 137                         LCONSOLE_ERROR_MSG(0x166, "%s: Connection to service "
 138                                            "%.*s via nid %s was lost; in progress"
 139                                            "operations using this service will"
 140                                            "fail.\n",
 141                                            imp->imp_obd->obd_name,
 142                                            target_len, target_start,
 143                                  libcfs_nid2str(imp->imp_connection->c_peer.nid));
 144                 }
 145                 ptlrpc_deactivate_timeouts(imp);
 146                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
 147                 spin_unlock(&imp->imp_lock);
 148
 149                 if (obd_dump_on_timeout)
 150                         libcfs_debug_dumplog();
 151
 152                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
 153                 rc = 1;
 154         } else {
 155                 spin_unlock(&imp->imp_lock);
 156                 CDEBUG(D_HA, "%s: import %p already %s (conn %u, was %u): %s\n",
 157                        imp->imp_client->cli_name, imp,
 158                        (imp->imp_state == LUSTRE_IMP_FULL &&
 159                         imp->imp_conn_cnt > conn_cnt) ?
 160                        "reconnected" : "not connected", imp->imp_conn_cnt,
 161                        conn_cnt, ptlrpc_import_state_name(imp->imp_state));
 162         }
 163
 164         return rc;
 165 }
 166
 167 /* Must be called with imp_lock held! */
 168 static void ptlrpc_deactivate_and_unlock_import(struct obd_import *imp)
 169 {
 170         ENTRY;
 171         LASSERT_SPIN_LOCKED(&imp->imp_lock);
 172
 173         CDEBUG(D_HA, "setting import %s INVALID\n", obd2cli_tgt(imp->imp_obd));
 174         imp->imp_invalid = 1;
 175         imp->imp_generation++;
 176         spin_unlock(&imp->imp_lock);
 177
 178         ptlrpc_abort_inflight(imp);
 179         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
 180
 181         EXIT;
 182 }
 183
 184 /*
 185  * This acts as a barrier; all existing requests are rejected, and
 186  * no new requests will be accepted until the import is valid again.
 187  */
 188 void ptlrpc_deactivate_import(struct obd_import *imp)
 189 {
 190         spin_lock(&imp->imp_lock);
 191         ptlrpc_deactivate_and_unlock_import(imp);
 192 }
 193
 194 /*
 195  * This function will invalidate the import, if necessary, then block
 196  * for all the RPC completions, and finally notify the obd to
 197  * invalidate its state (ie cancel locks, clear pending requests,
 198  * etc).
 199  */
 200 void ptlrpc_invalidate_import(struct obd_import *imp)
 201 {
 202         struct list_head *tmp, *n;
 203         struct ptlrpc_request *req;
 204         struct l_wait_info lwi;
 205         int rc;
 206
 207         atomic_inc(&imp->imp_inval_count);
 208
 209         /*
 210          * If this is an invalid MGC connection, then don't bother
 211          * waiting for imp_inflight to drop to 0.
 212          */
 213         if (imp->imp_invalid && imp->imp_recon_bk && !imp->imp_obd->obd_no_recov)
 214                 goto out;
 215
 216         if (!imp->imp_invalid || imp->imp_obd->obd_no_recov)
 217                 ptlrpc_deactivate_import(imp);
 218
 219         LASSERT(imp->imp_invalid);
 220
 221         /* wait for all requests to error out and call completion callbacks.
 222            Cap it at obd_timeout -- these should all have been locally
 223            cancelled by ptlrpc_abort_inflight. */
 224         lwi = LWI_TIMEOUT_INTERVAL(
 225                 cfs_timeout_cap(cfs_time_seconds(obd_timeout)),
 226                 cfs_time_seconds(1), NULL, NULL);
 227         rc = l_wait_event(imp->imp_recovery_waitq,
 228                           (atomic_read(&imp->imp_inflight) == 0), &lwi);
 229
 230         if (rc) {
 231                 CERROR("%s: rc = %d waiting for callback (%d != 0)\n",
 232                          obd2cli_tgt(imp->imp_obd), rc,
 233                          atomic_read(&imp->imp_inflight));
 234                 spin_lock(&imp->imp_lock);
 235                 list_for_each_safe(tmp, n, &imp->imp_sending_list) {
 236                         req = list_entry(tmp, struct ptlrpc_request, rq_list);
 237                         DEBUG_REQ(D_ERROR, req, "still on sending list");
 238                 }
 239                 list_for_each_safe(tmp, n, &imp->imp_delayed_list) {
 240                         req = list_entry(tmp, struct ptlrpc_request, rq_list);
 241                         DEBUG_REQ(D_ERROR, req, "still on delayed list");
 242                 }
 243                 spin_unlock(&imp->imp_lock);
 244                 LASSERT(atomic_read(&imp->imp_inflight) == 0);
 245         }
 246
 247 out:
 248         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
 249         sptlrpc_import_flush_all_ctx(imp);
 250
 251         atomic_dec(&imp->imp_inval_count);
 252         cfs_waitq_signal(&imp->imp_recovery_waitq);
 253 }
 254
 255 /* unset imp_invalid */
 256 void ptlrpc_activate_import(struct obd_import *imp)
 257 {
 258         struct obd_device *obd = imp->imp_obd;
 259
 260         spin_lock(&imp->imp_lock);
 261         imp->imp_invalid = 0;
 262         ptlrpc_activate_timeouts(imp);
 263         spin_unlock(&imp->imp_lock);
 264         obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
 265 }
 266
 267 void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt)
 268 {
 269         ENTRY;
 270
 271         LASSERT(!imp->imp_dlm_fake);
 272
 273         if (ptlrpc_set_import_discon(imp, conn_cnt)) {
 274                 if (!imp->imp_replayable) {
 275                         CDEBUG(D_HA, "import %s@%s for %s not replayable, "
 276                                "auto-deactivating\n",
 277                                obd2cli_tgt(imp->imp_obd),
 278                                imp->imp_connection->c_remote_uuid.uuid,
 279                                imp->imp_obd->obd_name);
 280                         ptlrpc_deactivate_import(imp);
 281                 }
 282
 283                 CDEBUG(D_HA, "%s: waking up pinger\n",
 284                        obd2cli_tgt(imp->imp_obd));
 285
 286                 spin_lock(&imp->imp_lock);
 287                 imp->imp_force_verify = 1;
 288                 spin_unlock(&imp->imp_lock);
 289
 290                 ptlrpc_pinger_wake_up();
 291         }
 292         EXIT;
 293 }
 294
 295 int ptlrpc_reconnect_import(struct obd_import *imp)
 296 {
 297
 298         ptlrpc_set_import_discon(imp, 0);
 299         /* Force a new connect attempt */
 300         ptlrpc_invalidate_import(imp);
 301         /* Do a fresh connect next time by zeroing the handle */
 302         ptlrpc_disconnect_import(imp, 1);
 303         /* Wait for all invalidate calls to finish */
 304         if (atomic_read(&imp->imp_inval_count) > 0) {
 305                 int rc;
 306                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
 307                 rc = l_wait_event(imp->imp_recovery_waitq,
 308                                   (atomic_read(&imp->imp_inval_count) == 0),
 309                                   &lwi);
 310                 if (rc)
 311                         CERROR("Interrupted, inval=%d\n",
 312                                atomic_read(&imp->imp_inval_count));
 313         }
 314
 315         /* Allow reconnect attempts */
 316         imp->imp_obd->obd_no_recov = 0;
 317         /* Remove 'invalid' flag */
 318         ptlrpc_activate_import(imp);
 319         /* Attempt a new connect */
 320         ptlrpc_recover_import(imp, NULL);
 321         return 0;
 322 }
 323
 324 EXPORT_SYMBOL(ptlrpc_reconnect_import);
 325
 326 static int import_select_connection(struct obd_import *imp)
 327 {
 328         struct obd_import_conn *imp_conn = NULL, *conn;
 329         struct obd_export *dlmexp;
 330         int tried_all = 1;
 331         ENTRY;
 332
 333         spin_lock(&imp->imp_lock);
 334
 335         if (list_empty(&imp->imp_conn_list)) {
 336                 CERROR("%s: no connections available\n",
 337                         imp->imp_obd->obd_name);
 338                 spin_unlock(&imp->imp_lock);
 339                 RETURN(-EINVAL);
 340         }
 341
 342         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 343                 CDEBUG(D_HA, "%s: connect to NID %s last attempt "LPU64"\n",
 344                        imp->imp_obd->obd_name,
 345                        libcfs_nid2str(conn->oic_conn->c_peer.nid),
 346                        conn->oic_last_attempt);
 347                 /* Don't thrash connections */
 348                 if (cfs_time_before_64(cfs_time_current_64(),
 349                                      conn->oic_last_attempt +
 350                                      cfs_time_seconds(CONNECTION_SWITCH_MIN))) {
 351                         continue;
 352                 }
 353
 354                 /* If we have not tried this connection since the
 355                    the last successful attempt, go with this one */
 356                 if ((conn->oic_last_attempt == 0) ||
 357                     cfs_time_beforeq_64(conn->oic_last_attempt,
 358                                        imp->imp_last_success_conn)) {
 359                         imp_conn = conn;
 360                         tried_all = 0;
 361                         break;
 362                 }
 363
 364                 /* If all of the connections have already been tried
 365                    since the last successful connection; just choose the
 366                    least recently used */
 367                 if (!imp_conn)
 368                         imp_conn = conn;
 369                 else if (cfs_time_before_64(conn->oic_last_attempt,
 370                                             imp_conn->oic_last_attempt))
 371                         imp_conn = conn;
 372         }
 373
 374         /* if not found, simply choose the current one */
 375         if (!imp_conn) {
 376                 LASSERT(imp->imp_conn_current);
 377                 imp_conn = imp->imp_conn_current;
 378                 tried_all = 0;
 379         }
 380         LASSERT(imp_conn->oic_conn);
 381
 382         /* If we've tried everything, and we're back to the beginning of the
 383            list, increase our timeout and try again. It will be reset when
 384            we do finally connect. (FIXME: really we should wait for all network
 385            state associated with the last connection attempt to drain before
 386            trying to reconnect on it.) */
 387         if (tried_all && (imp->imp_conn_list.next == &imp_conn->oic_item) &&
 388             !imp->imp_recon_bk /* not retrying */) {
 389                 if (at_get(&imp->imp_at.iat_net_latency) <
 390                     CONNECTION_SWITCH_MAX) {
 391                         at_add(&imp->imp_at.iat_net_latency,
 392                                at_get(&imp->imp_at.iat_net_latency) +
 393                                CONNECTION_SWITCH_INC);
 394                 }
 395                 LASSERT(imp_conn->oic_last_attempt);
 396                 CWARN("%s: tried all connections, increasing latency to %ds\n",
 397                       imp->imp_obd->obd_name,
 398                       at_get(&imp->imp_at.iat_net_latency));
 399         }
 400
 401         imp_conn->oic_last_attempt = cfs_time_current_64();
 402
 403         /* switch connection, don't mind if it's same as the current one */
 404         if (imp->imp_connection)
 405                 ptlrpc_put_connection(imp->imp_connection);
 406         imp->imp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 407
 408         dlmexp =  class_conn2export(&imp->imp_dlm_handle);
 409         LASSERT(dlmexp != NULL);
 410         if (dlmexp->exp_connection)
 411                 ptlrpc_put_connection(dlmexp->exp_connection);
 412         dlmexp->exp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 413         class_export_put(dlmexp);
 414
 415         if (imp->imp_conn_current != imp_conn) {
 416                 if (imp->imp_conn_current)
 417                         LCONSOLE_INFO("Changing connection for %s to %s/%s\n",
 418                                       imp->imp_obd->obd_name,
 419                                       imp_conn->oic_uuid.uuid,
 420                                       libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
 421                 imp->imp_conn_current = imp_conn;
 422         }
 423
 424         CDEBUG(D_HA, "%s: import %p using connection %s/%s\n",
 425                imp->imp_obd->obd_name, imp, imp_conn->oic_uuid.uuid,
 426                libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
 427
 428         spin_unlock(&imp->imp_lock);
 429
 430         RETURN(0);
 431 }
 432
 433 /*
 434  * must be called under imp_lock
 435  */
 436 int ptlrpc_first_transno(struct obd_import *imp, __u64 *transno)
 437 {
 438         struct ptlrpc_request *req;
 439         struct list_head *tmp;
 440
 441         if (list_empty(&imp->imp_replay_list))
 442                 return 0;
 443         tmp = imp->imp_replay_list.next;
 444         req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
 445         *transno = req->rq_transno;
 446         if (req->rq_transno == 0) {
 447                 DEBUG_REQ(D_ERROR, req, "zero transno in replay");
 448                 LBUG();
 449         }
 450
 451         return 1;
 452 }
 453
 454 int ptlrpc_connect_import(struct obd_import *imp, char *new_uuid)
 455 {
 456         struct obd_device *obd = imp->imp_obd;
 457         int initial_connect = 0;
 458         int set_transno = 0;
 459         __u64 committed_before_reconnect = 0;
 460         struct ptlrpc_request *request;
 461         char *bufs[] = { NULL,
 462                          obd2cli_tgt(imp->imp_obd),
 463                          obd->obd_uuid.uuid,
 464                          (char *)&imp->imp_dlm_handle,
 465                          (char *)&imp->imp_connect_data };
 466         struct ptlrpc_connect_async_args *aa;
 467         int rc;
 468         ENTRY;
 469
 470         spin_lock(&imp->imp_lock);
 471         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 472                 spin_unlock(&imp->imp_lock);
 473                 CERROR("can't connect to a closed import\n");
 474                 RETURN(-EINVAL);
 475         } else if (imp->imp_state == LUSTRE_IMP_FULL) {
 476                 spin_unlock(&imp->imp_lock);
 477                 CERROR("already connected\n");
 478                 RETURN(0);
 479         } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
 480                 spin_unlock(&imp->imp_lock);
 481                 CERROR("already connecting\n");
 482                 RETURN(-EALREADY);
 483         }
 484
 485         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
 486
 487         imp->imp_conn_cnt++;
 488         imp->imp_resend_replay = 0;
 489
 490         if (!lustre_handle_is_used(&imp->imp_remote_handle))
 491                 initial_connect = 1;
 492         else
 493                 committed_before_reconnect = imp->imp_peer_committed_transno;
 494
 495         set_transno = ptlrpc_first_transno(imp, &imp->imp_connect_data.ocd_transno);
 496         spin_unlock(&imp->imp_lock);
 497
 498         if (new_uuid) {
 499                 struct obd_uuid uuid;
 500
 501                 obd_str2uuid(&uuid, new_uuid);
 502                 rc = import_set_conn_priority(imp, &uuid);
 503                 if (rc)
 504                         GOTO(out, rc);
 505         }
 506
 507         rc = import_select_connection(imp);
 508         if (rc)
 509                 GOTO(out, rc);
 510
 511         /* last in connection list */
 512         if (imp->imp_conn_current->oic_item.next == &imp->imp_conn_list) {
 513                 if (imp->imp_initial_recov_bk && initial_connect) {
 514                         CDEBUG(D_HA, "Last connection attempt (%d) for %s\n",
 515                                imp->imp_conn_cnt, obd2cli_tgt(imp->imp_obd));
 516                         /* Don't retry if connect fails */
 517                         rc = 0;
 518                         obd_set_info_async(obd->obd_self_export,
 519                                            sizeof(KEY_INIT_RECOV),
 520                                            KEY_INIT_RECOV,
 521                                            sizeof(rc), &rc, NULL);
 522                 }
 523                 if (imp->imp_recon_bk) {
 524                         CDEBUG(D_HA, "Last reconnection attempt (%d) for %s\n",
 525                                imp->imp_conn_cnt, obd2cli_tgt(imp->imp_obd));
 526                         spin_lock(&imp->imp_lock);
 527                         imp->imp_last_recon = 1;
 528                         spin_unlock(&imp->imp_lock);
 529                 }
 530         }
 531
 532         rc = sptlrpc_import_sec_adapt(imp, NULL, 0);
 533         if (rc)
 534                 GOTO(out, rc);
 535
 536         /* Reset connect flags to the originally requested flags, in case
 537          * the server is updated on-the-fly we will get the new features. */
 538         imp->imp_connect_data.ocd_connect_flags = imp->imp_connect_flags_orig;
 539         imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 540
 541         rc = obd_reconnect(NULL, imp->imp_obd->obd_self_export, obd,
 542                            &obd->obd_uuid, &imp->imp_connect_data);
 543         if (rc)
 544                 GOTO(out, rc);
 545
 546         request = ptlrpc_request_alloc(imp, &RQF_MDS_CONNECT);
 547         if (request == NULL)
 548                 GOTO(out, rc = -ENOMEM);
 549
 550         rc = ptlrpc_request_bufs_pack(request, LUSTRE_OBD_VERSION,
 551                                       imp->imp_connect_op, bufs, NULL);
 552         if (rc) {
 553                 ptlrpc_request_free(request);
 554                 GOTO(out, rc);
 555         }
 556
 557 #ifndef __KERNEL__
 558         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_LIBCLIENT);
 559 #endif
 560         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_NEXT_VER);
 561
 562         request->rq_send_state = LUSTRE_IMP_CONNECTING;
 563         /* Allow a slightly larger reply for future growth compatibility */
 564         req_capsule_set_size(&request->rq_pill, &RMF_CONNECT_DATA, RCL_SERVER,
 565                              sizeof(struct obd_connect_data)+16*sizeof(__u64));
 566         ptlrpc_request_set_replen(request);
 567         request->rq_interpret_reply = ptlrpc_connect_interpret;
 568
 569         CLASSERT(sizeof (*aa) <= sizeof (request->rq_async_args));
 570         aa = ptlrpc_req_async_args(request);
 571         memset(aa, 0, sizeof *aa);
 572
 573         aa->pcaa_peer_committed = committed_before_reconnect;
 574         aa->pcaa_initial_connect = initial_connect;
 575
 576         if (aa->pcaa_initial_connect) {
 577                 spin_lock(&imp->imp_lock);
 578                 imp->imp_replayable = 1;
 579                 spin_unlock(&imp->imp_lock);
 580                 lustre_msg_add_op_flags(request->rq_reqmsg,
 581                                         MSG_CONNECT_INITIAL);
 582                 if (AT_OFF)
 583                         /* AT will use INITIAL_CONNECT_TIMEOUT the first
 584                            time, adaptive after that. */
 585                         request->rq_timeout = INITIAL_CONNECT_TIMEOUT;
 586         }
 587
 588         if (set_transno)
 589                 lustre_msg_add_op_flags(request->rq_reqmsg,
 590                                         MSG_CONNECT_TRANSNO);
 591
 592         DEBUG_REQ(D_RPCTRACE, request, "(re)connect request");
 593         ptlrpcd_add_req(request);
 594         rc = 0;
 595 out:
 596         if (rc != 0) {
 597                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 598         }
 599
 600         RETURN(rc);
 601 }
 602 EXPORT_SYMBOL(ptlrpc_connect_import);
 603
 604 static void ptlrpc_maybe_ping_import_soon(struct obd_import *imp)
 605 {
 606 #ifdef __KERNEL__
 607         struct obd_import_conn *imp_conn;
 608 #endif
 609         int wake_pinger = 0;
 610
 611         ENTRY;
 612
 613         spin_lock(&imp->imp_lock);
 614         if (list_empty(&imp->imp_conn_list))
 615                 GOTO(unlock, 0);
 616
 617 #ifdef __KERNEL__
 618         imp_conn = list_entry(imp->imp_conn_list.prev,
 619                               struct obd_import_conn,
 620                               oic_item);
 621
 622         /* XXX: When the failover node is the primary node, it is possible
 623          * to have two identical connections in imp_conn_list. We must
 624          * compare not conn's pointers but NIDs, otherwise we can defeat
 625          * connection throttling. (See bug 14774.) */
 626         if (imp->imp_conn_current->oic_conn->c_self !=
 627                                 imp_conn->oic_conn->c_self) {
 628                 ptlrpc_ping_import_soon(imp);
 629                 wake_pinger = 1;
 630         }
 631 #else
 632         /* liblustre has no pinger thead, so we wakup pinger anyway */
 633         wake_pinger = 1;
 634 #endif
 635
 636  unlock:
 637         spin_unlock(&imp->imp_lock);
 638
 639         if (wake_pinger)
 640                 ptlrpc_pinger_wake_up();
 641
 642         EXIT;
 643 }
 644
 645 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
 646                                     void * data, int rc)
 647 {
 648         struct ptlrpc_connect_async_args *aa = data;
 649         struct obd_import *imp = request->rq_import;
 650         struct client_obd *cli = &imp->imp_obd->u.cli;
 651         struct lustre_handle old_hdl;
 652         int msg_flags;
 653         ENTRY;
 654
 655         spin_lock(&imp->imp_lock);
 656         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 657                 spin_unlock(&imp->imp_lock);
 658                 RETURN(0);
 659         }
 660         spin_unlock(&imp->imp_lock);
 661
 662         if (rc)
 663                 GOTO(out, rc);
 664
 665         LASSERT(imp->imp_conn_current);
 666
 667         msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
 668
 669         /* All imports are pingable */
 670         spin_lock(&imp->imp_lock);
 671         imp->imp_pingable = 1;
 672
 673         if (aa->pcaa_initial_connect) {
 674                 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
 675                         imp->imp_replayable = 1;
 676                         spin_unlock(&imp->imp_lock);
 677                         CDEBUG(D_HA, "connected to replayable target: %s\n",
 678                                obd2cli_tgt(imp->imp_obd));
 679                 } else {
 680                         imp->imp_replayable = 0;
 681                         spin_unlock(&imp->imp_lock);
 682                 }
 683
 684                 /* if applies, adjust the imp->imp_msg_magic here
 685                  * according to reply flags */
 686
 687                 imp->imp_remote_handle =
 688                                 *lustre_msg_get_handle(request->rq_repmsg);
 689
 690                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 691                 spin_lock(&imp->imp_lock);
 692                 if (imp->imp_invalid) {
 693                         spin_unlock(&imp->imp_lock);
 694                         ptlrpc_activate_import(imp);
 695                 } else {
 696                         spin_unlock(&imp->imp_lock);
 697                 }
 698
 699                 GOTO(finish, rc = 0);
 700         } else {
 701                 spin_unlock(&imp->imp_lock);
 702         }
 703
 704         /* Determine what recovery state to move the import to. */
 705         if (MSG_CONNECT_RECONNECT & msg_flags) {
 706                 memset(&old_hdl, 0, sizeof(old_hdl));
 707                 if (!memcmp(&old_hdl, lustre_msg_get_handle(request->rq_repmsg),
 708                             sizeof (old_hdl))) {
 709                         CERROR("%s@%s didn't like our handle "LPX64
 710                                ", failed\n", obd2cli_tgt(imp->imp_obd),
 711                                imp->imp_connection->c_remote_uuid.uuid,
 712                                imp->imp_dlm_handle.cookie);
 713                         GOTO(out, rc = -ENOTCONN);
 714                 }
 715
 716                 if (memcmp(&imp->imp_remote_handle,
 717                            lustre_msg_get_handle(request->rq_repmsg),
 718                            sizeof(imp->imp_remote_handle))) {
 719
 720                         CWARN("%s@%s changed server handle from "
 721                                LPX64" to "LPX64" - evicting.\n",
 722                                obd2cli_tgt(imp->imp_obd),
 723                                imp->imp_connection->c_remote_uuid.uuid,
 724                                imp->imp_remote_handle.cookie,
 725                                lustre_msg_get_handle(request->rq_repmsg)->
 726                                          cookie);
 727                         imp->imp_remote_handle =
 728                                      *lustre_msg_get_handle(request->rq_repmsg);
 729
 730                         IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 731                         GOTO(finish, rc = 0);
 732                 } else {
 733                         CDEBUG(D_HA, "reconnected to %s@%s after partition\n",
 734                                obd2cli_tgt(imp->imp_obd),
 735                                imp->imp_connection->c_remote_uuid.uuid);
 736                 }
 737
 738                 if (imp->imp_invalid) {
 739                         CDEBUG(D_HA, "%s: reconnected but import is invalid; "
 740                                "marking evicted\n", imp->imp_obd->obd_name);
 741                         IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 742                 } else if (MSG_CONNECT_RECOVERING & msg_flags) {
 743                         CDEBUG(D_HA, "%s: reconnected to %s during replay\n",
 744                                imp->imp_obd->obd_name,
 745                                obd2cli_tgt(imp->imp_obd));
 746
 747                         spin_lock(&imp->imp_lock);
 748                         imp->imp_resend_replay = 1;
 749                         spin_unlock(&imp->imp_lock);
 750
 751                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 752                 } else {
 753                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 754                 }
 755         } else if ((MSG_CONNECT_RECOVERING & msg_flags) && !imp->imp_invalid) {
 756                 LASSERT(imp->imp_replayable);
 757                 imp->imp_remote_handle =
 758                                 *lustre_msg_get_handle(request->rq_repmsg);
 759                 imp->imp_last_replay_transno = 0;
 760                 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 761         } else {
 762                 DEBUG_REQ(D_HA, request, "%s: evicting (reconnect/recover flags"
 763                           " not set: %x)", imp->imp_obd->obd_name, msg_flags);
 764                 imp->imp_remote_handle =
 765                                 *lustre_msg_get_handle(request->rq_repmsg);
 766                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 767         }
 768
 769         /* Sanity checks for a reconnected import. */
 770         if (!(imp->imp_replayable) != !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
 771                 CERROR("imp_replayable flag does not match server "
 772                        "after reconnect. We should LBUG right here.\n");
 773         }
 774
 775         if (lustre_msg_get_last_committed(request->rq_repmsg) <
 776             aa->pcaa_peer_committed) {
 777                 CERROR("%s went back in time (transno "LPD64
 778                        " was previously committed, server now claims "LPD64
 779                        ")!  See https://bugzilla.clusterfs.com/"
 780                        "long_list.cgi?buglist=9646\n",
 781                        obd2cli_tgt(imp->imp_obd), aa->pcaa_peer_committed,
 782                        lustre_msg_get_last_committed(request->rq_repmsg));
 783         }
 784
 785 finish:
 786         rc = ptlrpc_import_recovery_state_machine(imp);
 787         if (rc != 0) {
 788                 if (rc == -ENOTCONN) {
 789                         CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
 790                                "invalidating and reconnecting\n",
 791                                obd2cli_tgt(imp->imp_obd),
 792                                imp->imp_connection->c_remote_uuid.uuid);
 793                         ptlrpc_connect_import(imp, NULL);
 794                         RETURN(0);
 795                 }
 796         } else {
 797                 struct obd_connect_data *ocd;
 798                 struct obd_export *exp;
 799                 int ret;
 800                 ret = req_capsule_get_size(&request->rq_pill, &RMF_CONNECT_DATA,
 801                                            RCL_SERVER);
 802                 /* server replied obd_connect_data is always bigger */
 803                 ocd = req_capsule_server_sized_get(&request->rq_pill,
 804                                                    &RMF_CONNECT_DATA, ret);
 805
 806                 spin_lock(&imp->imp_lock);
 807                 list_del(&imp->imp_conn_current->oic_item);
 808                 list_add(&imp->imp_conn_current->oic_item, &imp->imp_conn_list);
 809                 imp->imp_last_success_conn =
 810                         imp->imp_conn_current->oic_last_attempt;
 811
 812                 if (ocd == NULL) {
 813                         spin_unlock(&imp->imp_lock);
 814                         CERROR("Wrong connect data from server\n");
 815                         rc = -EPROTO;
 816                         GOTO(out, rc);
 817                 }
 818
 819                 imp->imp_connect_data = *ocd;
 820
 821                 exp = class_conn2export(&imp->imp_dlm_handle);
 822                 spin_unlock(&imp->imp_lock);
 823
 824                 /* check that server granted subset of flags we asked for. */
 825                 LASSERTF((ocd->ocd_connect_flags &
 826                           imp->imp_connect_flags_orig) ==
 827                          ocd->ocd_connect_flags, LPX64" != "LPX64,
 828                          imp->imp_connect_flags_orig, ocd->ocd_connect_flags);
 829
 830                 if (!exp) {
 831                         /* This could happen if export is cleaned during the
 832                            connect attempt */
 833                         CERROR("Missing export for %s\n",
 834                                imp->imp_obd->obd_name);
 835                         GOTO(out, rc = -ENODEV);
 836                 }
 837                 exp->exp_connect_flags = ocd->ocd_connect_flags;
 838                 imp->imp_obd->obd_self_export->exp_connect_flags =
 839                                                         ocd->ocd_connect_flags;
 840                 class_export_put(exp);
 841
 842                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_OCD);
 843
 844                 if (!ocd->ocd_ibits_known &&
 845                     ocd->ocd_connect_flags & OBD_CONNECT_IBITS)
 846                         CERROR("Inodebits aware server returned zero compatible"
 847                                " bits?\n");
 848
 849                 if ((ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
 850                     (ocd->ocd_version > LUSTRE_VERSION_CODE +
 851                                         LUSTRE_VERSION_OFFSET_WARN ||
 852                      ocd->ocd_version < LUSTRE_VERSION_CODE -
 853                                         LUSTRE_VERSION_OFFSET_WARN)) {
 854                         /* Sigh, some compilers do not like #ifdef in the middle
 855                            of macro arguments */
 856 #ifdef __KERNEL__
 857                         const char *older =
 858                                 "older. Consider upgrading this client";
 859 #else
 860                         const char *older =
 861                                 "older. Consider recompiling this application";
 862 #endif
 863                         const char *newer = "newer than client version";
 864
 865                         LCONSOLE_WARN("Server %s version (%d.%d.%d.%d) "
 866                                       "is much %s (%s)\n",
 867                                       obd2cli_tgt(imp->imp_obd),
 868                                       OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
 869                                       OBD_OCD_VERSION_MINOR(ocd->ocd_version),
 870                                       OBD_OCD_VERSION_PATCH(ocd->ocd_version),
 871                                       OBD_OCD_VERSION_FIX(ocd->ocd_version),
 872                                       ocd->ocd_version > LUSTRE_VERSION_CODE ?
 873                                       newer : older, LUSTRE_VERSION_STRING);
 874                 }
 875
 876                 if (ocd->ocd_connect_flags & OBD_CONNECT_CKSUM) {
 877                         /* We sent to the server ocd_cksum_types with bits set
 878                          * for algorithms we understand. The server masked off
 879                          * the checksum types it doesn't support */
 880                         if ((ocd->ocd_cksum_types & OBD_CKSUM_ALL) == 0) {
 881                                 LCONSOLE_WARN("The negotiation of the checksum "
 882                                               "alogrithm to use with server %s "
 883                                               "failed (%x/%x), disabling "
 884                                               "checksums\n",
 885                                               obd2cli_tgt(imp->imp_obd),
 886                                               ocd->ocd_cksum_types,
 887                                               OBD_CKSUM_ALL);
 888                                 cli->cl_checksum = 0;
 889                                 cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 890                                 cli->cl_cksum_type = OBD_CKSUM_CRC32;
 891                         } else {
 892                                 cli->cl_supp_cksum_types = ocd->ocd_cksum_types;
 893
 894                                 if (ocd->ocd_cksum_types & OSC_DEFAULT_CKSUM)
 895                                         cli->cl_cksum_type = OSC_DEFAULT_CKSUM;
 896                                 else if (ocd->ocd_cksum_types & OBD_CKSUM_ADLER)
 897                                         cli->cl_cksum_type = OBD_CKSUM_ADLER;
 898                                 else
 899                                         cli->cl_cksum_type = OBD_CKSUM_CRC32;
 900                         }
 901                 } else {
 902                         /* The server does not support OBD_CONNECT_CKSUM.
 903                          * Enforce CRC32 for backward compatibility*/
 904                         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 905                         cli->cl_cksum_type = OBD_CKSUM_CRC32;
 906                 }
 907
 908                 if (ocd->ocd_connect_flags & OBD_CONNECT_BRW_SIZE) {
 909                         cli->cl_max_pages_per_rpc =
 910                                 ocd->ocd_brw_size >> CFS_PAGE_SHIFT;
 911                 }
 912
 913                 imp->imp_obd->obd_namespace->ns_connect_flags =
 914                                                         ocd->ocd_connect_flags;
 915                 imp->imp_obd->obd_namespace->ns_orig_connect_flags =
 916                                                         ocd->ocd_connect_flags;
 917
 918                 if ((ocd->ocd_connect_flags & OBD_CONNECT_AT) &&
 919                     (imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
 920                         /* We need a per-message support flag, because
 921                            a. we don't know if the incoming connect reply
 922                               supports AT or not (in reply_in_callback)
 923                               until we unpack it.
 924                            b. failovered server means export and flags are gone
 925                               (in ptlrpc_send_reply).
 926                            Can only be set when we know AT is supported at
 927                            both ends */
 928                         imp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 929                 else
 930                         imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 931
 932                 LASSERT((cli->cl_max_pages_per_rpc <= PTLRPC_MAX_BRW_PAGES) &&
 933                         (cli->cl_max_pages_per_rpc > 0));
 934         }
 935
 936 out:
 937         if (rc != 0) {
 938                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 939                 spin_lock(&imp->imp_lock);
 940                 if (aa->pcaa_initial_connect && !imp->imp_initial_recov &&
 941                     (request->rq_import_generation == imp->imp_generation))
 942                         ptlrpc_deactivate_and_unlock_import(imp);
 943                 else
 944                         spin_unlock(&imp->imp_lock);
 945
 946                 if ((imp->imp_recon_bk && imp->imp_last_recon) ||
 947                     (rc == -EACCES)) {
 948                         /*
 949                          * Give up trying to reconnect
 950                          * EACCES means client has no permission for connection
 951                          */
 952                         imp->imp_obd->obd_no_recov = 1;
 953                         ptlrpc_deactivate_import(imp);
 954                 }
 955
 956                 if (rc == -EPROTO) {
 957                         struct obd_connect_data *ocd;
 958
 959                         /* reply message might not be ready */
 960                         if (request->rq_repmsg == NULL)
 961                                 RETURN(-EPROTO);
 962
 963                         ocd = req_capsule_server_get(&request->rq_pill,
 964                                                      &RMF_CONNECT_DATA);
 965                         if (ocd &&
 966                             (ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
 967                             (ocd->ocd_version != LUSTRE_VERSION_CODE)) {
 968                            /* Actually servers are only supposed to refuse
 969                               connection from liblustre clients, so we should
 970                               never see this from VFS context */
 971                                 LCONSOLE_ERROR_MSG(0x16a, "Server %s version "
 972                                         "(%d.%d.%d.%d)"
 973                                         " refused connection from this client "
 974                                         "with an incompatible version (%s).  "
 975                                         "Client must be recompiled\n",
 976                                         obd2cli_tgt(imp->imp_obd),
 977                                         OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
 978                                         OBD_OCD_VERSION_MINOR(ocd->ocd_version),
 979                                         OBD_OCD_VERSION_PATCH(ocd->ocd_version),
 980                                         OBD_OCD_VERSION_FIX(ocd->ocd_version),
 981                                         LUSTRE_VERSION_STRING);
 982                                 ptlrpc_deactivate_import(imp);
 983                                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CLOSED);
 984                         }
 985                         RETURN(-EPROTO);
 986                 }
 987
 988                 ptlrpc_maybe_ping_import_soon(imp);
 989
 990                 CDEBUG(D_HA, "recovery of %s on %s failed (%d)\n",
 991                        obd2cli_tgt(imp->imp_obd),
 992                        (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
 993         }
 994
 995         spin_lock(&imp->imp_lock);
 996         imp->imp_last_recon = 0;
 997         spin_unlock(&imp->imp_lock);
 998
 999         cfs_waitq_signal(&imp->imp_recovery_waitq);
1000         RETURN(rc);
1001 }
1002
1003 static int completed_replay_interpret(struct ptlrpc_request *req,
1004                                     void * data, int rc)
1005 {
1006         ENTRY;
1007         atomic_dec(&req->rq_import->imp_replay_inflight);
1008         if (req->rq_status == 0) {
1009                 ptlrpc_import_recovery_state_machine(req->rq_import);
1010         } else {
1011                 CDEBUG(D_HA, "%s: LAST_REPLAY message error: %d, "
1012                        "reconnecting\n",
1013                        req->rq_import->imp_obd->obd_name, req->rq_status);
1014                 ptlrpc_connect_import(req->rq_import, NULL);
1015         }
1016
1017         RETURN(0);
1018 }
1019
1020 static int signal_completed_replay(struct obd_import *imp)
1021 {
1022         struct ptlrpc_request *req;
1023         ENTRY;
1024
1025         LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
1026         atomic_inc(&imp->imp_replay_inflight);
1027
1028         req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING, LUSTRE_OBD_VERSION,
1029                                         OBD_PING);
1030         if (req == NULL) {
1031                 atomic_dec(&imp->imp_replay_inflight);
1032                 RETURN(-ENOMEM);
1033         }
1034
1035         ptlrpc_request_set_replen(req);
1036         req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
1037         lustre_msg_add_flags(req->rq_reqmsg,
1038                              MSG_LOCK_REPLAY_DONE | MSG_REQ_REPLAY_DONE);
1039         req->rq_timeout *= 3;
1040         req->rq_interpret_reply = completed_replay_interpret;
1041
1042         ptlrpcd_add_req(req);
1043         RETURN(0);
1044 }
1045
1046 #ifdef __KERNEL__
1047 static int ptlrpc_invalidate_import_thread(void *data)
1048 {
1049         struct obd_import *imp = data;
1050
1051         ENTRY;
1052
1053         ptlrpc_daemonize("ll_imp_inval");
1054
1055         CDEBUG(D_HA, "thread invalidate import %s to %s@%s\n",
1056                imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
1057                imp->imp_connection->c_remote_uuid.uuid);
1058
1059         ptlrpc_invalidate_import(imp);
1060
1061         if (obd_dump_on_eviction) {
1062                 CERROR("dump the log upon eviction\n");
1063                 libcfs_debug_dumplog();
1064         }
1065
1066         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1067         ptlrpc_import_recovery_state_machine(imp);
1068
1069         RETURN(0);
1070 }
1071 #endif
1072
1073 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
1074 {
1075         int rc = 0;
1076         int inflight;
1077         char *target_start;
1078         int target_len;
1079
1080         ENTRY;
1081         if (imp->imp_state == LUSTRE_IMP_EVICTED) {
1082                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1083                           &target_start, &target_len);
1084                 /* Don't care about MGC eviction */
1085                 if (strcmp(imp->imp_obd->obd_type->typ_name,
1086                            LUSTRE_MGC_NAME) != 0) {
1087                         LCONSOLE_ERROR_MSG(0x167, "This client was evicted by "
1088                                            "%.*s; in progress operations using "
1089                                            "this service will fail.\n",
1090                                            target_len, target_start);
1091                 }
1092                 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
1093                        obd2cli_tgt(imp->imp_obd),
1094                        imp->imp_connection->c_remote_uuid.uuid);
1095
1096 #ifdef __KERNEL__
1097                 rc = cfs_kernel_thread(ptlrpc_invalidate_import_thread, imp,
1098                                        CLONE_VM | CLONE_FILES);
1099                 if (rc < 0)
1100                         CERROR("error starting invalidate thread: %d\n", rc);
1101                 else
1102                         rc = 0;
1103                 RETURN(rc);
1104 #else
1105                 ptlrpc_invalidate_import(imp);
1106
1107                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1108 #endif
1109         }
1110
1111         if (imp->imp_state == LUSTRE_IMP_REPLAY) {
1112                 CDEBUG(D_HA, "replay requested by %s\n",
1113                        obd2cli_tgt(imp->imp_obd));
1114                 rc = ptlrpc_replay_next(imp, &inflight);
1115                 if (inflight == 0 &&
1116                     atomic_read(&imp->imp_replay_inflight) == 0) {
1117                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
1118                         rc = ldlm_replay_locks(imp);
1119                         if (rc)
1120                                 GOTO(out, rc);
1121                 }
1122                 rc = 0;
1123         }
1124
1125         if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
1126                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
1127                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
1128                         rc = signal_completed_replay(imp);
1129                         if (rc)
1130                                 GOTO(out, rc);
1131                 }
1132
1133         }
1134
1135         if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
1136                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
1137                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1138                 }
1139         }
1140
1141         if (imp->imp_state == LUSTRE_IMP_RECOVER) {
1142                 CDEBUG(D_HA, "reconnected to %s@%s\n",
1143                        obd2cli_tgt(imp->imp_obd),
1144                        imp->imp_connection->c_remote_uuid.uuid);
1145
1146                 rc = ptlrpc_resend(imp);
1147                 if (rc)
1148                         GOTO(out, rc);
1149                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
1150                 ptlrpc_activate_import(imp);
1151
1152                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1153                           &target_start, &target_len);
1154                 LCONSOLE_INFO("%s: Connection restored to service %.*s "
1155                               "using nid %s.\n", imp->imp_obd->obd_name,
1156                               target_len, target_start,
1157                               libcfs_nid2str(imp->imp_connection->c_peer.nid));
1158         }
1159
1160         if (imp->imp_state == LUSTRE_IMP_FULL) {
1161                 cfs_waitq_signal(&imp->imp_recovery_waitq);
1162                 ptlrpc_wake_delayed(imp);
1163         }
1164
1165 out:
1166         RETURN(rc);
1167 }
1168
1169 static int back_to_sleep(void *unused)
1170 {
1171         return 0;
1172 }
1173
1174 int ptlrpc_disconnect_import(struct obd_import *imp, int noclose)
1175 {
1176         struct ptlrpc_request *req;
1177         int rq_opc, rc = 0;
1178         int nowait = imp->imp_obd->obd_force;
1179         ENTRY;
1180
1181         if (nowait)
1182                 GOTO(set_state, rc);
1183
1184         switch (imp->imp_connect_op) {
1185         case OST_CONNECT: rq_opc = OST_DISCONNECT; break;
1186         case MDS_CONNECT: rq_opc = MDS_DISCONNECT; break;
1187         case MGS_CONNECT: rq_opc = MGS_DISCONNECT; break;
1188         default:
1189                 CERROR("don't know how to disconnect from %s (connect_op %d)\n",
1190                        obd2cli_tgt(imp->imp_obd), imp->imp_connect_op);
1191                 RETURN(-EINVAL);
1192         }
1193
1194         if (ptlrpc_import_in_recovery(imp)) {
1195                 struct l_wait_info lwi;
1196                 cfs_duration_t timeout;
1197
1198
1199                 if (AT_OFF) {
1200                         if (imp->imp_server_timeout)
1201                                 timeout = cfs_time_seconds(obd_timeout / 2);
1202                         else
1203                                 timeout = cfs_time_seconds(obd_timeout);
1204                 } else {
1205                         int idx = import_at_get_index(imp,
1206                                 imp->imp_client->cli_request_portal);
1207                         timeout = cfs_time_seconds(
1208                                 at_get(&imp->imp_at.iat_service_estimate[idx]));
1209                 }
1210
1211                 lwi = LWI_TIMEOUT_INTR(cfs_timeout_cap(timeout),
1212                                        back_to_sleep, LWI_ON_SIGNAL_NOOP, NULL);
1213                 rc = l_wait_event(imp->imp_recovery_waitq,
1214                                   !ptlrpc_import_in_recovery(imp), &lwi);
1215
1216         }
1217
1218         spin_lock(&imp->imp_lock);
1219         if (imp->imp_state != LUSTRE_IMP_FULL)
1220                 GOTO(out, 0);
1221
1222         spin_unlock(&imp->imp_lock);
1223
1224         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_DISCONNECT,
1225                                         LUSTRE_OBD_VERSION, rq_opc);
1226         if (req) {
1227                 /* We are disconnecting, do not retry a failed DISCONNECT rpc if
1228                  * it fails.  We can get through the above with a down server
1229                  * if the client doesn't know the server is gone yet. */
1230                 req->rq_no_resend = 1;
1231
1232 #ifndef CRAY_XT3
1233                 /* We want client umounts to happen quickly, no matter the
1234                    server state... */
1235                 req->rq_timeout = min_t(int, req->rq_timeout,
1236                                         INITIAL_CONNECT_TIMEOUT);
1237 #else
1238                 /* ... but we always want liblustre clients to nicely
1239                    disconnect, so only use the adaptive value. */
1240                 if (AT_OFF)
1241                         req->rq_timeout = obd_timeout / 3;
1242 #endif
1243
1244                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
1245                 req->rq_send_state =  LUSTRE_IMP_CONNECTING;
1246                 ptlrpc_request_set_replen(req);
1247                 rc = ptlrpc_queue_wait(req);
1248                 ptlrpc_req_finished(req);
1249         }
1250
1251 set_state:
1252         spin_lock(&imp->imp_lock);
1253 out:
1254         if (noclose)
1255                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
1256         else
1257                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
1258         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
1259         imp->imp_conn_cnt = 0;
1260         /* Try all connections in the future - bz 12758 */
1261         imp->imp_last_recon = 0;
1262         spin_unlock(&imp->imp_lock);
1263
1264         RETURN(rc);
1265 }
1266
1267
1268 /* Adaptive Timeout utils */
1269 extern unsigned int at_min, at_max, at_history;
1270
1271 /* Bin into timeslices using AT_BINS bins.
1272    This gives us a max of the last binlimit*AT_BINS secs without the storage,
1273    but still smoothing out a return to normalcy from a slow response.
1274    (E.g. remember the maximum latency in each minute of the last 4 minutes.) */
1275 int at_add(struct adaptive_timeout *at, unsigned int val)
1276 {
1277         unsigned int old = at->at_current;
1278         time_t now = cfs_time_current_sec();
1279         time_t binlimit = max_t(time_t, at_history / AT_BINS, 1);
1280
1281         LASSERT(at);
1282 #if 0
1283         CDEBUG(D_INFO, "add %u to %p time=%lu v=%u (%u %u %u %u)\n",
1284                val, at, now - at->at_binstart, at->at_current,
1285                at->at_hist[0], at->at_hist[1], at->at_hist[2], at->at_hist[3]);
1286 #endif
1287         if (val == 0)
1288                 /* 0's don't count, because we never want our timeout to
1289                    drop to 0, and because 0 could mean an error */
1290                 return 0;
1291
1292         spin_lock(&at->at_lock);
1293
1294         if (unlikely(at->at_binstart == 0)) {
1295                 /* Special case to remove default from history */
1296                 at->at_current = val;
1297                 at->at_worst_ever = val;
1298                 at->at_worst_time = now;
1299                 at->at_hist[0] = val;
1300                 at->at_binstart = now;
1301         } else if (now - at->at_binstart < binlimit ) {
1302                 /* in bin 0 */
1303                 at->at_hist[0] = max(val, at->at_hist[0]);
1304                 at->at_current = max(val, at->at_current);
1305         } else {
1306                 int i, shift;
1307                 unsigned int maxv = val;
1308                 /* move bins over */
1309                 shift = (now - at->at_binstart) / binlimit;
1310                 LASSERT(shift > 0);
1311                 for(i = AT_BINS - 1; i >= 0; i--) {
1312                         if (i >= shift) {
1313                                 at->at_hist[i] = at->at_hist[i - shift];
1314                                 maxv = max(maxv, at->at_hist[i]);
1315                         } else {
1316                                 at->at_hist[i] = 0;
1317                         }
1318                 }
1319                 at->at_hist[0] = val;
1320                 at->at_current = maxv;
1321                 at->at_binstart += shift * binlimit;
1322         }
1323
1324         if (at->at_current > at->at_worst_ever) {
1325                 at->at_worst_ever = at->at_current;
1326                 at->at_worst_time = now;
1327         }
1328
1329         if (at->at_flags & AT_FLG_NOHIST)
1330                 /* Only keep last reported val; keeping the rest of the history
1331                    for proc only */
1332                 at->at_current = val;
1333
1334         if (at_max > 0)
1335                 at->at_current =  min(at->at_current, at_max);
1336         at->at_current =  max(at->at_current, at_min);
1337
1338 #if 0
1339         if (at->at_current != old)
1340                 CDEBUG(D_ADAPTTO, "AT %p change: old=%u new=%u delta=%d "
1341                        "(val=%u) hist %u %u %u %u\n", at,
1342                        old, at->at_current, at->at_current - old, val,
1343                        at->at_hist[0], at->at_hist[1], at->at_hist[2],
1344                        at->at_hist[3]);
1345 #endif
1346
1347         /* if we changed, report the old value */
1348         old = (at->at_current != old) ? old : 0;
1349
1350         spin_unlock(&at->at_lock);
1351         return old;
1352 }
1353
1354 /* Find the imp_at index for a given portal; assign if space available */
1355 int import_at_get_index(struct obd_import *imp, int portal)
1356 {
1357         struct imp_at *at = &imp->imp_at;
1358         int i;
1359
1360         for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1361                 if (at->iat_portal[i] == portal)
1362                         return i;
1363                 if (at->iat_portal[i] == 0)
1364                         /* unused */
1365                         break;
1366         }
1367
1368         /* Not found in list, add it under a lock */
1369         spin_lock(&imp->imp_lock);
1370
1371         /* Check unused under lock */
1372         for (; i < IMP_AT_MAX_PORTALS; i++) {
1373                 if (at->iat_portal[i] == portal)
1374                         goto out;
1375                 if (at->iat_portal[i] == 0)
1376                         /* unused */
1377                         break;
1378         }
1379
1380         /* Not enough portals? */
1381         LASSERT(i < IMP_AT_MAX_PORTALS);
1382
1383         at->iat_portal[i] = portal;
1384 out:
1385         spin_unlock(&imp->imp_lock);
1386         return i;
1387 }
1388