lustre/ptlrpc/import.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/ptlrpc/import.c
  37  *
  38  * Author: Mike Shaver <shaver@clusterfs.com>
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_RPC
  42 #ifndef __KERNEL__
  43 # include <liblustre.h>
  44 #endif
  45
  46 #include <obd_support.h>
  47 #include <lustre_ha.h>
  48 #include <lustre_net.h>
  49 #include <lustre_import.h>
  50 #include <lustre_export.h>
  51 #include <obd.h>
  52 #include <obd_cksum.h>
  53 #include <obd_class.h>
  54
  55 #include "ptlrpc_internal.h"
  56
  57 struct ptlrpc_connect_async_args {
  58          __u64 pcaa_peer_committed;
  59         int pcaa_initial_connect;
  60 };
  61
  62 /* A CLOSED import should remain so. */
  63 #define IMPORT_SET_STATE_NOLOCK(imp, state)                                    \
  64 do {                                                                           \
  65         if (imp->imp_state != LUSTRE_IMP_CLOSED) {                             \
  66                CDEBUG(D_HA, "%p %s: changing import state from %s to %s\n",    \
  67                       imp, obd2cli_tgt(imp->imp_obd),                          \
  68                       ptlrpc_import_state_name(imp->imp_state),                \
  69                       ptlrpc_import_state_name(state));                        \
  70                imp->imp_state = state;                                         \
  71         }                                                                      \
  72 } while(0)
  73
  74 #define IMPORT_SET_STATE(imp, state)            \
  75 do {                                            \
  76         spin_lock(&imp->imp_lock);              \
  77         IMPORT_SET_STATE_NOLOCK(imp, state);    \
  78         spin_unlock(&imp->imp_lock);            \
  79 } while(0)
  80
  81
  82 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
  83                                     void * data, int rc);
  84 int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
  85
  86 /* Only this function is allowed to change the import state when it is
  87  * CLOSED. I would rather refcount the import and free it after
  88  * disconnection like we do with exports. To do that, the client_obd
  89  * will need to save the peer info somewhere other than in the import,
  90  * though. */
  91 int ptlrpc_init_import(struct obd_import *imp)
  92 {
  93         spin_lock(&imp->imp_lock);
  94
  95         imp->imp_generation++;
  96         imp->imp_state =  LUSTRE_IMP_NEW;
  97
  98         spin_unlock(&imp->imp_lock);
  99
 100         return 0;
 101 }
 102 EXPORT_SYMBOL(ptlrpc_init_import);
 103
 104 #define UUID_STR "_UUID"
 105 static void deuuidify(char *uuid, const char *prefix, char **uuid_start,
 106                       int *uuid_len)
 107 {
 108         *uuid_start = !prefix || strncmp(uuid, prefix, strlen(prefix))
 109                 ? uuid : uuid + strlen(prefix);
 110
 111         *uuid_len = strlen(*uuid_start);
 112
 113         if (*uuid_len < strlen(UUID_STR))
 114                 return;
 115
 116         if (!strncmp(*uuid_start + *uuid_len - strlen(UUID_STR),
 117                     UUID_STR, strlen(UUID_STR)))
 118                 *uuid_len -= strlen(UUID_STR);
 119 }
 120
 121 /* Returns true if import was FULL, false if import was already not
 122  * connected.
 123  * @imp - import to be disconnected
 124  * @conn_cnt - connection count (epoch) of the request that timed out
 125  *             and caused the disconnection.  In some cases, multiple
 126  *             inflight requests can fail to a single target (e.g. OST
 127  *             bulk requests) and if one has already caused a reconnection
 128  *             (increasing the import->conn_cnt) the older failure should
 129  *             not also cause a reconnection.  If zero it forces a reconnect.
 130  */
 131 int ptlrpc_set_import_discon(struct obd_import *imp, __u32 conn_cnt)
 132 {
 133         int rc = 0;
 134
 135         spin_lock(&imp->imp_lock);
 136
 137         if (imp->imp_state == LUSTRE_IMP_FULL &&
 138             (conn_cnt == 0 || conn_cnt == imp->imp_conn_cnt)) {
 139                 char *target_start;
 140                 int   target_len;
 141
 142                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
 143                           &target_start, &target_len);
 144
 145                 if (imp->imp_replayable) {
 146                         LCONSOLE_WARN("%s: Connection to service %.*s via nid "
 147                                "%s was lost; in progress operations using this "
 148                                "service will wait for recovery to complete.\n",
 149                                imp->imp_obd->obd_name, target_len, target_start,
 150                                libcfs_nid2str(imp->imp_connection->c_peer.nid));
 151                 } else {
 152                         LCONSOLE_ERROR_MSG(0x166, "%s: Connection to service "
 153                                            "%.*s via nid %s was lost; in progress"
 154                                            "operations using this service will"
 155                                            "fail.\n",
 156                                            imp->imp_obd->obd_name,
 157                                            target_len, target_start,
 158                                  libcfs_nid2str(imp->imp_connection->c_peer.nid));
 159                 }
 160                 ptlrpc_deactivate_timeouts(imp);
 161                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
 162                 spin_unlock(&imp->imp_lock);
 163
 164                 if (obd_dump_on_timeout)
 165                         libcfs_debug_dumplog();
 166
 167                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
 168                 rc = 1;
 169         } else {
 170                 spin_unlock(&imp->imp_lock);
 171                 CDEBUG(D_HA, "%s: import %p already %s (conn %u, was %u): %s\n",
 172                        imp->imp_client->cli_name, imp,
 173                        (imp->imp_state == LUSTRE_IMP_FULL &&
 174                         imp->imp_conn_cnt > conn_cnt) ?
 175                        "reconnected" : "not connected", imp->imp_conn_cnt,
 176                        conn_cnt, ptlrpc_import_state_name(imp->imp_state));
 177         }
 178
 179         return rc;
 180 }
 181
 182 /* Must be called with imp_lock held! */
 183 static void ptlrpc_deactivate_and_unlock_import(struct obd_import *imp)
 184 {
 185         ENTRY;
 186         LASSERT_SPIN_LOCKED(&imp->imp_lock);
 187
 188         CDEBUG(D_HA, "setting import %s INVALID\n", obd2cli_tgt(imp->imp_obd));
 189         imp->imp_invalid = 1;
 190         imp->imp_generation++;
 191         spin_unlock(&imp->imp_lock);
 192
 193         ptlrpc_abort_inflight(imp);
 194         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
 195
 196         EXIT;
 197 }
 198
 199 /*
 200  * This acts as a barrier; all existing requests are rejected, and
 201  * no new requests will be accepted until the import is valid again.
 202  */
 203 void ptlrpc_deactivate_import(struct obd_import *imp)
 204 {
 205         spin_lock(&imp->imp_lock);
 206         ptlrpc_deactivate_and_unlock_import(imp);
 207 }
 208
 209 /*
 210  * This function will invalidate the import, if necessary, then block
 211  * for all the RPC completions, and finally notify the obd to
 212  * invalidate its state (ie cancel locks, clear pending requests,
 213  * etc).
 214  */
 215 void ptlrpc_invalidate_import(struct obd_import *imp)
 216 {
 217         struct list_head *tmp, *n;
 218         struct ptlrpc_request *req;
 219         struct l_wait_info lwi;
 220         int rc;
 221
 222         atomic_inc(&imp->imp_inval_count);
 223
 224         /*
 225          * If this is an invalid MGC connection, then don't bother
 226          * waiting for imp_inflight to drop to 0.
 227          */
 228         if (imp->imp_invalid && imp->imp_recon_bk && !imp->imp_obd->obd_no_recov)
 229                 goto out;
 230
 231         if (!imp->imp_invalid || imp->imp_obd->obd_no_recov)
 232                 ptlrpc_deactivate_import(imp);
 233
 234         LASSERT(imp->imp_invalid);
 235
 236         /* wait for all requests to error out and call completion callbacks.
 237            Cap it at obd_timeout -- these should all have been locally
 238            cancelled by ptlrpc_abort_inflight. */
 239         lwi = LWI_TIMEOUT_INTERVAL(
 240                 cfs_timeout_cap(cfs_time_seconds(obd_timeout)),
 241                 cfs_time_seconds(1), NULL, NULL);
 242         rc = l_wait_event(imp->imp_recovery_waitq,
 243                           (atomic_read(&imp->imp_inflight) == 0), &lwi);
 244
 245         if (rc) {
 246                 CERROR("%s: rc = %d waiting for callback (%d != 0)\n",
 247                          obd2cli_tgt(imp->imp_obd), rc,
 248                          atomic_read(&imp->imp_inflight));
 249                 spin_lock(&imp->imp_lock);
 250                 list_for_each_safe(tmp, n, &imp->imp_sending_list) {
 251                         req = list_entry(tmp, struct ptlrpc_request, rq_list);
 252                         DEBUG_REQ(D_ERROR, req, "still on sending list");
 253                 }
 254                 list_for_each_safe(tmp, n, &imp->imp_delayed_list) {
 255                         req = list_entry(tmp, struct ptlrpc_request, rq_list);
 256                         DEBUG_REQ(D_ERROR, req, "still on delayed list");
 257                 }
 258                 spin_unlock(&imp->imp_lock);
 259                 LASSERT(atomic_read(&imp->imp_inflight) == 0);
 260         }
 261
 262 out:
 263         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
 264         sptlrpc_import_flush_all_ctx(imp);
 265
 266         atomic_dec(&imp->imp_inval_count);
 267         cfs_waitq_signal(&imp->imp_recovery_waitq);
 268 }
 269
 270 /* unset imp_invalid */
 271 void ptlrpc_activate_import(struct obd_import *imp)
 272 {
 273         struct obd_device *obd = imp->imp_obd;
 274
 275         spin_lock(&imp->imp_lock);
 276         imp->imp_invalid = 0;
 277         ptlrpc_activate_timeouts(imp);
 278         spin_unlock(&imp->imp_lock);
 279         obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
 280 }
 281
 282 void ptlrpc_fail_import(struct obd_import *imp, __u32 conn_cnt)
 283 {
 284         ENTRY;
 285
 286         LASSERT(!imp->imp_dlm_fake);
 287
 288         if (ptlrpc_set_import_discon(imp, conn_cnt)) {
 289                 if (!imp->imp_replayable) {
 290                         CDEBUG(D_HA, "import %s@%s for %s not replayable, "
 291                                "auto-deactivating\n",
 292                                obd2cli_tgt(imp->imp_obd),
 293                                imp->imp_connection->c_remote_uuid.uuid,
 294                                imp->imp_obd->obd_name);
 295                         ptlrpc_deactivate_import(imp);
 296                 }
 297
 298                 CDEBUG(D_HA, "%s: waking up pinger\n",
 299                        obd2cli_tgt(imp->imp_obd));
 300
 301                 spin_lock(&imp->imp_lock);
 302                 imp->imp_force_verify = 1;
 303                 spin_unlock(&imp->imp_lock);
 304
 305                 ptlrpc_pinger_wake_up();
 306         }
 307         EXIT;
 308 }
 309
 310 int ptlrpc_reconnect_import(struct obd_import *imp)
 311 {
 312         ptlrpc_set_import_discon(imp, 0);
 313         /* Force a new connect attempt */
 314         ptlrpc_invalidate_import(imp);
 315         /* Do a fresh connect next time by zeroing the handle */
 316         ptlrpc_disconnect_import(imp, 1);
 317         /* Wait for all invalidate calls to finish */
 318         if (atomic_read(&imp->imp_inval_count) > 0) {
 319                 int rc;
 320                 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
 321                 rc = l_wait_event(imp->imp_recovery_waitq,
 322                                   (atomic_read(&imp->imp_inval_count) == 0),
 323                                   &lwi);
 324                 if (rc)
 325                         CERROR("Interrupted, inval=%d\n",
 326                                atomic_read(&imp->imp_inval_count));
 327         }
 328
 329         /* Allow reconnect attempts */
 330         imp->imp_obd->obd_no_recov = 0;
 331         /* Remove 'invalid' flag */
 332         ptlrpc_activate_import(imp);
 333         /* Attempt a new connect */
 334         ptlrpc_recover_import(imp, NULL);
 335         return 0;
 336 }
 337
 338 EXPORT_SYMBOL(ptlrpc_reconnect_import);
 339
 340 static int import_select_connection(struct obd_import *imp)
 341 {
 342         struct obd_import_conn *imp_conn = NULL, *conn;
 343         struct obd_export *dlmexp;
 344         int tried_all = 1;
 345         ENTRY;
 346
 347         spin_lock(&imp->imp_lock);
 348
 349         if (list_empty(&imp->imp_conn_list)) {
 350                 CERROR("%s: no connections available\n",
 351                         imp->imp_obd->obd_name);
 352                 spin_unlock(&imp->imp_lock);
 353                 RETURN(-EINVAL);
 354         }
 355
 356         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 357                 CDEBUG(D_HA, "%s: connect to NID %s last attempt "LPU64"\n",
 358                        imp->imp_obd->obd_name,
 359                        libcfs_nid2str(conn->oic_conn->c_peer.nid),
 360                        conn->oic_last_attempt);
 361                 /* Don't thrash connections */
 362                 if (cfs_time_before_64(cfs_time_current_64(),
 363                                      conn->oic_last_attempt +
 364                                      cfs_time_seconds(CONNECTION_SWITCH_MIN))) {
 365                         continue;
 366                 }
 367
 368                 /* If we have not tried this connection since the
 369                    the last successful attempt, go with this one */
 370                 if ((conn->oic_last_attempt == 0) ||
 371                     cfs_time_beforeq_64(conn->oic_last_attempt,
 372                                        imp->imp_last_success_conn)) {
 373                         imp_conn = conn;
 374                         tried_all = 0;
 375                         break;
 376                 }
 377
 378                 /* If all of the connections have already been tried
 379                    since the last successful connection; just choose the
 380                    least recently used */
 381                 if (!imp_conn)
 382                         imp_conn = conn;
 383                 else if (cfs_time_before_64(conn->oic_last_attempt,
 384                                             imp_conn->oic_last_attempt))
 385                         imp_conn = conn;
 386         }
 387
 388         /* if not found, simply choose the current one */
 389         if (!imp_conn) {
 390                 LASSERT(imp->imp_conn_current);
 391                 imp_conn = imp->imp_conn_current;
 392                 tried_all = 0;
 393         }
 394         LASSERT(imp_conn->oic_conn);
 395
 396         /* If we've tried everything, and we're back to the beginning of the
 397            list, increase our timeout and try again. It will be reset when
 398            we do finally connect. (FIXME: really we should wait for all network
 399            state associated with the last connection attempt to drain before
 400            trying to reconnect on it.) */
 401         if (tried_all && (imp->imp_conn_list.next == &imp_conn->oic_item) &&
 402             !imp->imp_recon_bk /* not retrying */) {
 403                 if (at_get(&imp->imp_at.iat_net_latency) <
 404                     CONNECTION_SWITCH_MAX) {
 405                         at_add(&imp->imp_at.iat_net_latency,
 406                                at_get(&imp->imp_at.iat_net_latency) +
 407                                CONNECTION_SWITCH_INC);
 408                 }
 409                 LASSERT(imp_conn->oic_last_attempt);
 410                 CWARN("%s: tried all connections, increasing latency to %ds\n",
 411                       imp->imp_obd->obd_name,
 412                       at_get(&imp->imp_at.iat_net_latency));
 413         }
 414
 415         imp_conn->oic_last_attempt = cfs_time_current_64();
 416
 417         /* switch connection, don't mind if it's same as the current one */
 418         if (imp->imp_connection)
 419                 ptlrpc_connection_put(imp->imp_connection);
 420         imp->imp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 421
 422         dlmexp =  class_conn2export(&imp->imp_dlm_handle);
 423         LASSERT(dlmexp != NULL);
 424         if (dlmexp->exp_connection)
 425                 ptlrpc_connection_put(dlmexp->exp_connection);
 426         dlmexp->exp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 427         class_export_put(dlmexp);
 428
 429         if (imp->imp_conn_current != imp_conn) {
 430                 if (imp->imp_conn_current)
 431                         LCONSOLE_INFO("Changing connection for %s to %s/%s\n",
 432                                       imp->imp_obd->obd_name,
 433                                       imp_conn->oic_uuid.uuid,
 434                                       libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
 435                 imp->imp_conn_current = imp_conn;
 436         }
 437
 438         CDEBUG(D_HA, "%s: import %p using connection %s/%s\n",
 439                imp->imp_obd->obd_name, imp, imp_conn->oic_uuid.uuid,
 440                libcfs_nid2str(imp_conn->oic_conn->c_peer.nid));
 441
 442         spin_unlock(&imp->imp_lock);
 443
 444         RETURN(0);
 445 }
 446
 447 /*
 448  * must be called under imp_lock
 449  */
 450 int ptlrpc_first_transno(struct obd_import *imp, __u64 *transno)
 451 {
 452         struct ptlrpc_request *req;
 453         struct list_head *tmp;
 454
 455         if (list_empty(&imp->imp_replay_list))
 456                 return 0;
 457         tmp = imp->imp_replay_list.next;
 458         req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
 459         *transno = req->rq_transno;
 460         if (req->rq_transno == 0) {
 461                 DEBUG_REQ(D_ERROR, req, "zero transno in replay");
 462                 LBUG();
 463         }
 464
 465         return 1;
 466 }
 467
 468 int ptlrpc_connect_import(struct obd_import *imp, char *new_uuid)
 469 {
 470         struct obd_device *obd = imp->imp_obd;
 471         int initial_connect = 0;
 472         int set_transno = 0;
 473         __u64 committed_before_reconnect = 0;
 474         struct ptlrpc_request *request;
 475         char *bufs[] = { NULL,
 476                          obd2cli_tgt(imp->imp_obd),
 477                          obd->obd_uuid.uuid,
 478                          (char *)&imp->imp_dlm_handle,
 479                          (char *)&imp->imp_connect_data };
 480         struct ptlrpc_connect_async_args *aa;
 481         int rc;
 482         ENTRY;
 483
 484         spin_lock(&imp->imp_lock);
 485         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 486                 spin_unlock(&imp->imp_lock);
 487                 CERROR("can't connect to a closed import\n");
 488                 RETURN(-EINVAL);
 489         } else if (imp->imp_state == LUSTRE_IMP_FULL) {
 490                 spin_unlock(&imp->imp_lock);
 491                 CERROR("already connected\n");
 492                 RETURN(0);
 493         } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
 494                 spin_unlock(&imp->imp_lock);
 495                 CERROR("already connecting\n");
 496                 RETURN(-EALREADY);
 497         }
 498
 499         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
 500
 501         imp->imp_conn_cnt++;
 502         imp->imp_resend_replay = 0;
 503
 504         if (!lustre_handle_is_used(&imp->imp_remote_handle))
 505                 initial_connect = 1;
 506         else
 507                 committed_before_reconnect = imp->imp_peer_committed_transno;
 508
 509         set_transno = ptlrpc_first_transno(imp, &imp->imp_connect_data.ocd_transno);
 510         spin_unlock(&imp->imp_lock);
 511
 512         if (new_uuid) {
 513                 struct obd_uuid uuid;
 514
 515                 obd_str2uuid(&uuid, new_uuid);
 516                 rc = import_set_conn_priority(imp, &uuid);
 517                 if (rc)
 518                         GOTO(out, rc);
 519         }
 520
 521         rc = import_select_connection(imp);
 522         if (rc)
 523                 GOTO(out, rc);
 524
 525         /* last in connection list */
 526         if (imp->imp_conn_current->oic_item.next == &imp->imp_conn_list) {
 527                 if (imp->imp_initial_recov_bk && initial_connect) {
 528                         CDEBUG(D_HA, "Last connection attempt (%d) for %s\n",
 529                                imp->imp_conn_cnt, obd2cli_tgt(imp->imp_obd));
 530                         /* Don't retry if connect fails */
 531                         rc = 0;
 532                         obd_set_info_async(obd->obd_self_export,
 533                                            sizeof(KEY_INIT_RECOV),
 534                                            KEY_INIT_RECOV,
 535                                            sizeof(rc), &rc, NULL);
 536                 }
 537                 if (imp->imp_recon_bk) {
 538                         CDEBUG(D_HA, "Last reconnection attempt (%d) for %s\n",
 539                                imp->imp_conn_cnt, obd2cli_tgt(imp->imp_obd));
 540                         spin_lock(&imp->imp_lock);
 541                         imp->imp_last_recon = 1;
 542                         spin_unlock(&imp->imp_lock);
 543                 }
 544         }
 545
 546         rc = sptlrpc_import_sec_adapt(imp, NULL, 0);
 547         if (rc)
 548                 GOTO(out, rc);
 549
 550         /* Reset connect flags to the originally requested flags, in case
 551          * the server is updated on-the-fly we will get the new features. */
 552         imp->imp_connect_data.ocd_connect_flags = imp->imp_connect_flags_orig;
 553         imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 554
 555         rc = obd_reconnect(NULL, imp->imp_obd->obd_self_export, obd,
 556                            &obd->obd_uuid, &imp->imp_connect_data);
 557         if (rc)
 558                 GOTO(out, rc);
 559
 560         request = ptlrpc_request_alloc(imp, &RQF_MDS_CONNECT);
 561         if (request == NULL)
 562                 GOTO(out, rc = -ENOMEM);
 563
 564         rc = ptlrpc_request_bufs_pack(request, LUSTRE_OBD_VERSION,
 565                                       imp->imp_connect_op, bufs, NULL);
 566         if (rc) {
 567                 ptlrpc_request_free(request);
 568                 GOTO(out, rc);
 569         }
 570
 571 #ifndef __KERNEL__
 572         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_LIBCLIENT);
 573 #endif
 574         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_NEXT_VER);
 575
 576         request->rq_send_state = LUSTRE_IMP_CONNECTING;
 577         /* Allow a slightly larger reply for future growth compatibility */
 578         req_capsule_set_size(&request->rq_pill, &RMF_CONNECT_DATA, RCL_SERVER,
 579                              sizeof(struct obd_connect_data)+16*sizeof(__u64));
 580         ptlrpc_request_set_replen(request);
 581         request->rq_interpret_reply = ptlrpc_connect_interpret;
 582
 583         CLASSERT(sizeof (*aa) <= sizeof (request->rq_async_args));
 584         aa = ptlrpc_req_async_args(request);
 585         memset(aa, 0, sizeof *aa);
 586
 587         aa->pcaa_peer_committed = committed_before_reconnect;
 588         aa->pcaa_initial_connect = initial_connect;
 589
 590         if (aa->pcaa_initial_connect) {
 591                 spin_lock(&imp->imp_lock);
 592                 imp->imp_replayable = 1;
 593                 spin_unlock(&imp->imp_lock);
 594                 lustre_msg_add_op_flags(request->rq_reqmsg,
 595                                         MSG_CONNECT_INITIAL);
 596                 if (AT_OFF)
 597                         /* AT will use INITIAL_CONNECT_TIMEOUT the first
 598                            time, adaptive after that. */
 599                         request->rq_timeout = INITIAL_CONNECT_TIMEOUT;
 600         }
 601
 602         if (set_transno)
 603                 lustre_msg_add_op_flags(request->rq_reqmsg,
 604                                         MSG_CONNECT_TRANSNO);
 605
 606         DEBUG_REQ(D_RPCTRACE, request, "(re)connect request");
 607         ptlrpcd_add_req(request);
 608         rc = 0;
 609 out:
 610         if (rc != 0) {
 611                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 612         }
 613
 614         RETURN(rc);
 615 }
 616 EXPORT_SYMBOL(ptlrpc_connect_import);
 617
 618 static void ptlrpc_maybe_ping_import_soon(struct obd_import *imp)
 619 {
 620 #ifdef __KERNEL__
 621         struct obd_import_conn *imp_conn;
 622 #endif
 623         int wake_pinger = 0;
 624
 625         ENTRY;
 626
 627         spin_lock(&imp->imp_lock);
 628         if (list_empty(&imp->imp_conn_list))
 629                 GOTO(unlock, 0);
 630
 631 #ifdef __KERNEL__
 632         imp_conn = list_entry(imp->imp_conn_list.prev,
 633                               struct obd_import_conn,
 634                               oic_item);
 635
 636         /* XXX: When the failover node is the primary node, it is possible
 637          * to have two identical connections in imp_conn_list. We must
 638          * compare not conn's pointers but NIDs, otherwise we can defeat
 639          * connection throttling. (See bug 14774.) */
 640         if (imp->imp_conn_current->oic_conn->c_self !=
 641                                 imp_conn->oic_conn->c_self) {
 642                 ptlrpc_ping_import_soon(imp);
 643                 wake_pinger = 1;
 644         }
 645 #else
 646         /* liblustre has no pinger thead, so we wakup pinger anyway */
 647         wake_pinger = 1;
 648 #endif
 649
 650  unlock:
 651         spin_unlock(&imp->imp_lock);
 652
 653         if (wake_pinger)
 654                 ptlrpc_pinger_wake_up();
 655
 656         EXIT;
 657 }
 658
 659 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
 660                                     void * data, int rc)
 661 {
 662         struct ptlrpc_connect_async_args *aa = data;
 663         struct obd_import *imp = request->rq_import;
 664         struct client_obd *cli = &imp->imp_obd->u.cli;
 665         struct lustre_handle old_hdl;
 666         int msg_flags;
 667         ENTRY;
 668
 669         spin_lock(&imp->imp_lock);
 670         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 671                 spin_unlock(&imp->imp_lock);
 672                 RETURN(0);
 673         }
 674         spin_unlock(&imp->imp_lock);
 675
 676         if (rc)
 677                 GOTO(out, rc);
 678
 679         LASSERT(imp->imp_conn_current);
 680
 681         msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
 682
 683         /* All imports are pingable */
 684         spin_lock(&imp->imp_lock);
 685         imp->imp_pingable = 1;
 686
 687         if (aa->pcaa_initial_connect) {
 688                 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
 689                         imp->imp_replayable = 1;
 690                         spin_unlock(&imp->imp_lock);
 691                         CDEBUG(D_HA, "connected to replayable target: %s\n",
 692                                obd2cli_tgt(imp->imp_obd));
 693                 } else {
 694                         imp->imp_replayable = 0;
 695                         spin_unlock(&imp->imp_lock);
 696                 }
 697
 698                 /* if applies, adjust the imp->imp_msg_magic here
 699                  * according to reply flags */
 700
 701                 imp->imp_remote_handle =
 702                                 *lustre_msg_get_handle(request->rq_repmsg);
 703
 704                 /* Initial connects are allowed for clients with non-random
 705                  * uuids when servers are in recovery.  Simply signal the
 706                  * servers replay is complete and wait in REPLAY_WAIT. */
 707                 if (msg_flags & MSG_CONNECT_RECOVERING) {
 708                         CDEBUG(D_HA, "connect to %s during recovery\n",
 709                                obd2cli_tgt(imp->imp_obd));
 710                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
 711                 } else {
 712                         IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 713                 }
 714
 715                 spin_lock(&imp->imp_lock);
 716                 if (imp->imp_invalid) {
 717                         spin_unlock(&imp->imp_lock);
 718                         ptlrpc_activate_import(imp);
 719                 } else {
 720                         spin_unlock(&imp->imp_lock);
 721                 }
 722
 723                 GOTO(finish, rc = 0);
 724         } else {
 725                 spin_unlock(&imp->imp_lock);
 726         }
 727
 728         /* Determine what recovery state to move the import to. */
 729         if (MSG_CONNECT_RECONNECT & msg_flags) {
 730                 memset(&old_hdl, 0, sizeof(old_hdl));
 731                 if (!memcmp(&old_hdl, lustre_msg_get_handle(request->rq_repmsg),
 732                             sizeof (old_hdl))) {
 733                         CERROR("%s@%s didn't like our handle "LPX64
 734                                ", failed\n", obd2cli_tgt(imp->imp_obd),
 735                                imp->imp_connection->c_remote_uuid.uuid,
 736                                imp->imp_dlm_handle.cookie);
 737                         GOTO(out, rc = -ENOTCONN);
 738                 }
 739
 740                 if (memcmp(&imp->imp_remote_handle,
 741                            lustre_msg_get_handle(request->rq_repmsg),
 742                            sizeof(imp->imp_remote_handle))) {
 743                         int level = msg_flags & MSG_CONNECT_RECOVERING ? D_HA :
 744                                                                          D_WARNING;
 745
 746                         /* Bug 16611/14775: if server handle have changed,
 747                          * that means some sort of disconnection happened.
 748                          * If the server is not in recovery, that also means it
 749                          * already erased all of our state because of previous
 750                          * eviction. If it is in recovery - we are safe to
 751                          * participate since we can reestablish all of our state
 752                          * with server again */
 753                         CDEBUG(level,"%s@%s changed server handle from "
 754                                      LPX64" to "LPX64"%s \n" "but is still in recovery \n",
 755                                      obd2cli_tgt(imp->imp_obd),
 756                                      imp->imp_connection->c_remote_uuid.uuid,
 757                                      imp->imp_remote_handle.cookie,
 758                                      lustre_msg_get_handle(request->rq_repmsg)->
 759                                                                         cookie,
 760                                      (MSG_CONNECT_RECOVERING & msg_flags) ?
 761                                          "but is still in recovery" : "");
 762
 763                         imp->imp_remote_handle =
 764                                      *lustre_msg_get_handle(request->rq_repmsg);
 765
 766                         if (!(MSG_CONNECT_RECOVERING & msg_flags)) {
 767                                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 768                                 GOTO(finish, rc = 0);
 769                         }
 770
 771                 } else {
 772                         CDEBUG(D_HA, "reconnected to %s@%s after partition\n",
 773                                obd2cli_tgt(imp->imp_obd),
 774                                imp->imp_connection->c_remote_uuid.uuid);
 775                 }
 776
 777                 if (imp->imp_invalid) {
 778                         CDEBUG(D_HA, "%s: reconnected but import is invalid; "
 779                                "marking evicted\n", imp->imp_obd->obd_name);
 780                         IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 781                 } else if (MSG_CONNECT_RECOVERING & msg_flags) {
 782                         CDEBUG(D_HA, "%s: reconnected to %s during replay\n",
 783                                imp->imp_obd->obd_name,
 784                                obd2cli_tgt(imp->imp_obd));
 785
 786                         spin_lock(&imp->imp_lock);
 787                         imp->imp_resend_replay = 1;
 788                         spin_unlock(&imp->imp_lock);
 789
 790                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 791                 } else {
 792                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 793                 }
 794         } else if ((MSG_CONNECT_RECOVERING & msg_flags) && !imp->imp_invalid) {
 795                 LASSERT(imp->imp_replayable);
 796                 imp->imp_remote_handle =
 797                                 *lustre_msg_get_handle(request->rq_repmsg);
 798                 imp->imp_last_replay_transno = 0;
 799                 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 800         } else {
 801                 DEBUG_REQ(D_HA, request, "%s: evicting (reconnect/recover flags"
 802                           " not set: %x)", imp->imp_obd->obd_name, msg_flags);
 803                 imp->imp_remote_handle =
 804                                 *lustre_msg_get_handle(request->rq_repmsg);
 805                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 806         }
 807
 808         /* Sanity checks for a reconnected import. */
 809         if (!(imp->imp_replayable) != !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
 810                 CERROR("imp_replayable flag does not match server "
 811                        "after reconnect. We should LBUG right here.\n");
 812         }
 813
 814         if (lustre_msg_get_last_committed(request->rq_repmsg) <
 815             aa->pcaa_peer_committed) {
 816                 CERROR("%s went back in time (transno "LPD64
 817                        " was previously committed, server now claims "LPD64
 818                        ")!  See https://bugzilla.lustre.org/show_bug.cgi?"
 819                        "id=9646\n",
 820                        obd2cli_tgt(imp->imp_obd), aa->pcaa_peer_committed,
 821                        lustre_msg_get_last_committed(request->rq_repmsg));
 822         }
 823
 824 finish:
 825         rc = ptlrpc_import_recovery_state_machine(imp);
 826         if (rc != 0) {
 827                 if (rc == -ENOTCONN) {
 828                         CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
 829                                "invalidating and reconnecting\n",
 830                                obd2cli_tgt(imp->imp_obd),
 831                                imp->imp_connection->c_remote_uuid.uuid);
 832                         ptlrpc_connect_import(imp, NULL);
 833                         RETURN(0);
 834                 }
 835         } else {
 836                 struct obd_connect_data *ocd;
 837                 struct obd_export *exp;
 838                 int ret;
 839                 ret = req_capsule_get_size(&request->rq_pill, &RMF_CONNECT_DATA,
 840                                            RCL_SERVER);
 841                 /* server replied obd_connect_data is always bigger */
 842                 ocd = req_capsule_server_sized_get(&request->rq_pill,
 843                                                    &RMF_CONNECT_DATA, ret);
 844
 845                 spin_lock(&imp->imp_lock);
 846                 list_del(&imp->imp_conn_current->oic_item);
 847                 list_add(&imp->imp_conn_current->oic_item, &imp->imp_conn_list);
 848                 imp->imp_last_success_conn =
 849                         imp->imp_conn_current->oic_last_attempt;
 850
 851                 if (ocd == NULL) {
 852                         spin_unlock(&imp->imp_lock);
 853                         CERROR("Wrong connect data from server\n");
 854                         rc = -EPROTO;
 855                         GOTO(out, rc);
 856                 }
 857
 858                 imp->imp_connect_data = *ocd;
 859
 860                 exp = class_conn2export(&imp->imp_dlm_handle);
 861                 spin_unlock(&imp->imp_lock);
 862
 863                 /* check that server granted subset of flags we asked for. */
 864                 LASSERTF((ocd->ocd_connect_flags &
 865                           imp->imp_connect_flags_orig) ==
 866                          ocd->ocd_connect_flags, LPX64" != "LPX64,
 867                          imp->imp_connect_flags_orig, ocd->ocd_connect_flags);
 868
 869                 if (!exp) {
 870                         /* This could happen if export is cleaned during the
 871                            connect attempt */
 872                         CERROR("Missing export for %s\n",
 873                                imp->imp_obd->obd_name);
 874                         GOTO(out, rc = -ENODEV);
 875                 }
 876                 exp->exp_connect_flags = ocd->ocd_connect_flags;
 877                 imp->imp_obd->obd_self_export->exp_connect_flags =
 878                                                         ocd->ocd_connect_flags;
 879                 class_export_put(exp);
 880
 881                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_OCD);
 882
 883                 if (!ocd->ocd_ibits_known &&
 884                     ocd->ocd_connect_flags & OBD_CONNECT_IBITS)
 885                         CERROR("Inodebits aware server returned zero compatible"
 886                                " bits?\n");
 887
 888                 if ((ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
 889                     (ocd->ocd_version > LUSTRE_VERSION_CODE +
 890                                         LUSTRE_VERSION_OFFSET_WARN ||
 891                      ocd->ocd_version < LUSTRE_VERSION_CODE -
 892                                         LUSTRE_VERSION_OFFSET_WARN)) {
 893                         /* Sigh, some compilers do not like #ifdef in the middle
 894                            of macro arguments */
 895 #ifdef __KERNEL__
 896                         const char *older =
 897                                 "older. Consider upgrading this client";
 898 #else
 899                         const char *older =
 900                                 "older. Consider recompiling this application";
 901 #endif
 902                         const char *newer = "newer than client version";
 903
 904                         LCONSOLE_WARN("Server %s version (%d.%d.%d.%d) "
 905                                       "is much %s (%s)\n",
 906                                       obd2cli_tgt(imp->imp_obd),
 907                                       OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
 908                                       OBD_OCD_VERSION_MINOR(ocd->ocd_version),
 909                                       OBD_OCD_VERSION_PATCH(ocd->ocd_version),
 910                                       OBD_OCD_VERSION_FIX(ocd->ocd_version),
 911                                       ocd->ocd_version > LUSTRE_VERSION_CODE ?
 912                                       newer : older, LUSTRE_VERSION_STRING);
 913                 }
 914
 915                 if (ocd->ocd_connect_flags & OBD_CONNECT_CKSUM) {
 916                         /* We sent to the server ocd_cksum_types with bits set
 917                          * for algorithms we understand. The server masked off
 918                          * the checksum types it doesn't support */
 919                         if ((ocd->ocd_cksum_types & OBD_CKSUM_ALL) == 0) {
 920                                 LCONSOLE_WARN("The negotiation of the checksum "
 921                                               "alogrithm to use with server %s "
 922                                               "failed (%x/%x), disabling "
 923                                               "checksums\n",
 924                                               obd2cli_tgt(imp->imp_obd),
 925                                               ocd->ocd_cksum_types,
 926                                               OBD_CKSUM_ALL);
 927                                 cli->cl_checksum = 0;
 928                                 cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 929                                 cli->cl_cksum_type = OBD_CKSUM_CRC32;
 930                         } else {
 931                                 cli->cl_supp_cksum_types = ocd->ocd_cksum_types;
 932
 933                                 if (ocd->ocd_cksum_types & OSC_DEFAULT_CKSUM)
 934                                         cli->cl_cksum_type = OSC_DEFAULT_CKSUM;
 935                                 else if (ocd->ocd_cksum_types & OBD_CKSUM_ADLER)
 936                                         cli->cl_cksum_type = OBD_CKSUM_ADLER;
 937                                 else
 938                                         cli->cl_cksum_type = OBD_CKSUM_CRC32;
 939                         }
 940                 } else {
 941                         /* The server does not support OBD_CONNECT_CKSUM.
 942                          * Enforce CRC32 for backward compatibility*/
 943                         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 944                         cli->cl_cksum_type = OBD_CKSUM_CRC32;
 945                 }
 946
 947                 if (ocd->ocd_connect_flags & OBD_CONNECT_BRW_SIZE) {
 948                         cli->cl_max_pages_per_rpc =
 949                                 ocd->ocd_brw_size >> CFS_PAGE_SHIFT;
 950                 }
 951
 952                 imp->imp_obd->obd_namespace->ns_connect_flags =
 953                                                         ocd->ocd_connect_flags;
 954                 imp->imp_obd->obd_namespace->ns_orig_connect_flags =
 955                                                         ocd->ocd_connect_flags;
 956
 957                 if ((ocd->ocd_connect_flags & OBD_CONNECT_AT) &&
 958                     (imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
 959                         /* We need a per-message support flag, because
 960                            a. we don't know if the incoming connect reply
 961                               supports AT or not (in reply_in_callback)
 962                               until we unpack it.
 963                            b. failovered server means export and flags are gone
 964                               (in ptlrpc_send_reply).
 965                            Can only be set when we know AT is supported at
 966                            both ends */
 967                         imp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 968                 else
 969                         imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 970
 971                 LASSERT((cli->cl_max_pages_per_rpc <= PTLRPC_MAX_BRW_PAGES) &&
 972                         (cli->cl_max_pages_per_rpc > 0));
 973         }
 974
 975 out:
 976         if (rc != 0) {
 977                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 978                 spin_lock(&imp->imp_lock);
 979                 if (aa->pcaa_initial_connect && !imp->imp_initial_recov &&
 980                     (request->rq_import_generation == imp->imp_generation))
 981                         ptlrpc_deactivate_and_unlock_import(imp);
 982                 else
 983                         spin_unlock(&imp->imp_lock);
 984
 985                 if ((imp->imp_recon_bk && imp->imp_last_recon) ||
 986                     (rc == -EACCES)) {
 987                         /*
 988                          * Give up trying to reconnect
 989                          * EACCES means client has no permission for connection
 990                          */
 991                         imp->imp_obd->obd_no_recov = 1;
 992                         ptlrpc_deactivate_import(imp);
 993                 }
 994
 995                 if (rc == -EPROTO) {
 996                         struct obd_connect_data *ocd;
 997
 998                         /* reply message might not be ready */
 999                         if (request->rq_repmsg == NULL)
1000                                 RETURN(-EPROTO);
1001
1002                         ocd = req_capsule_server_get(&request->rq_pill,
1003                                                      &RMF_CONNECT_DATA);
1004                         if (ocd &&
1005                             (ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
1006                             (ocd->ocd_version != LUSTRE_VERSION_CODE)) {
1007                            /* Actually servers are only supposed to refuse
1008                               connection from liblustre clients, so we should
1009                               never see this from VFS context */
1010                                 LCONSOLE_ERROR_MSG(0x16a, "Server %s version "
1011                                         "(%d.%d.%d.%d)"
1012                                         " refused connection from this client "
1013                                         "with an incompatible version (%s).  "
1014                                         "Client must be recompiled\n",
1015                                         obd2cli_tgt(imp->imp_obd),
1016                                         OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
1017                                         OBD_OCD_VERSION_MINOR(ocd->ocd_version),
1018                                         OBD_OCD_VERSION_PATCH(ocd->ocd_version),
1019                                         OBD_OCD_VERSION_FIX(ocd->ocd_version),
1020                                         LUSTRE_VERSION_STRING);
1021                                 ptlrpc_deactivate_import(imp);
1022                                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CLOSED);
1023                         }
1024                         RETURN(-EPROTO);
1025                 }
1026
1027                 ptlrpc_maybe_ping_import_soon(imp);
1028
1029                 CDEBUG(D_HA, "recovery of %s on %s failed (%d)\n",
1030                        obd2cli_tgt(imp->imp_obd),
1031                        (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
1032         }
1033
1034         spin_lock(&imp->imp_lock);
1035         imp->imp_last_recon = 0;
1036         spin_unlock(&imp->imp_lock);
1037
1038         cfs_waitq_signal(&imp->imp_recovery_waitq);
1039         RETURN(rc);
1040 }
1041
1042 static int completed_replay_interpret(struct ptlrpc_request *req,
1043                                     void * data, int rc)
1044 {
1045         ENTRY;
1046         atomic_dec(&req->rq_import->imp_replay_inflight);
1047         if (req->rq_status == 0) {
1048                 ptlrpc_import_recovery_state_machine(req->rq_import);
1049         } else {
1050                 CDEBUG(D_HA, "%s: LAST_REPLAY message error: %d, "
1051                        "reconnecting\n",
1052                        req->rq_import->imp_obd->obd_name, req->rq_status);
1053                 ptlrpc_connect_import(req->rq_import, NULL);
1054         }
1055
1056         RETURN(0);
1057 }
1058
1059 static int signal_completed_replay(struct obd_import *imp)
1060 {
1061         struct ptlrpc_request *req;
1062         ENTRY;
1063
1064         LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
1065         atomic_inc(&imp->imp_replay_inflight);
1066
1067         req = ptlrpc_request_alloc_pack(imp, &RQF_OBD_PING, LUSTRE_OBD_VERSION,
1068                                         OBD_PING);
1069         if (req == NULL) {
1070                 atomic_dec(&imp->imp_replay_inflight);
1071                 RETURN(-ENOMEM);
1072         }
1073
1074         ptlrpc_request_set_replen(req);
1075         req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
1076         lustre_msg_add_flags(req->rq_reqmsg,
1077                              MSG_LOCK_REPLAY_DONE | MSG_REQ_REPLAY_DONE);
1078         req->rq_timeout *= 3;
1079         req->rq_interpret_reply = completed_replay_interpret;
1080
1081         ptlrpcd_add_req(req);
1082         RETURN(0);
1083 }
1084
1085 #ifdef __KERNEL__
1086 static int ptlrpc_invalidate_import_thread(void *data)
1087 {
1088         struct obd_import *imp = data;
1089
1090         ENTRY;
1091
1092         ptlrpc_daemonize("ll_imp_inval");
1093
1094         CDEBUG(D_HA, "thread invalidate import %s to %s@%s\n",
1095                imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
1096                imp->imp_connection->c_remote_uuid.uuid);
1097
1098         ptlrpc_invalidate_import(imp);
1099
1100         if (obd_dump_on_eviction) {
1101                 CERROR("dump the log upon eviction\n");
1102                 libcfs_debug_dumplog();
1103         }
1104
1105         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1106         ptlrpc_import_recovery_state_machine(imp);
1107
1108         RETURN(0);
1109 }
1110 #endif
1111
1112 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
1113 {
1114         int rc = 0;
1115         int inflight;
1116         char *target_start;
1117         int target_len;
1118
1119         ENTRY;
1120         if (imp->imp_state == LUSTRE_IMP_EVICTED) {
1121                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1122                           &target_start, &target_len);
1123                 /* Don't care about MGC eviction */
1124                 if (strcmp(imp->imp_obd->obd_type->typ_name,
1125                            LUSTRE_MGC_NAME) != 0) {
1126                         LCONSOLE_ERROR_MSG(0x167, "This client was evicted by "
1127                                            "%.*s; in progress operations using "
1128                                            "this service will fail.\n",
1129                                            target_len, target_start);
1130                 }
1131                 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
1132                        obd2cli_tgt(imp->imp_obd),
1133                        imp->imp_connection->c_remote_uuid.uuid);
1134
1135 #ifdef __KERNEL__
1136                 rc = cfs_kernel_thread(ptlrpc_invalidate_import_thread, imp,
1137                                        CLONE_VM | CLONE_FILES);
1138                 if (rc < 0)
1139                         CERROR("error starting invalidate thread: %d\n", rc);
1140                 else
1141                         rc = 0;
1142                 RETURN(rc);
1143 #else
1144                 ptlrpc_invalidate_import(imp);
1145
1146                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1147 #endif
1148         }
1149
1150         if (imp->imp_state == LUSTRE_IMP_REPLAY) {
1151                 CDEBUG(D_HA, "replay requested by %s\n",
1152                        obd2cli_tgt(imp->imp_obd));
1153                 rc = ptlrpc_replay_next(imp, &inflight);
1154                 if (inflight == 0 &&
1155                     atomic_read(&imp->imp_replay_inflight) == 0) {
1156                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
1157                         rc = ldlm_replay_locks(imp);
1158                         if (rc)
1159                                 GOTO(out, rc);
1160                 }
1161                 rc = 0;
1162         }
1163
1164         if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
1165                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
1166                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
1167                         rc = signal_completed_replay(imp);
1168                         if (rc)
1169                                 GOTO(out, rc);
1170                 }
1171
1172         }
1173
1174         if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
1175                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
1176                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
1177                 }
1178         }
1179
1180         if (imp->imp_state == LUSTRE_IMP_RECOVER) {
1181                 CDEBUG(D_HA, "reconnected to %s@%s\n",
1182                        obd2cli_tgt(imp->imp_obd),
1183                        imp->imp_connection->c_remote_uuid.uuid);
1184
1185                 rc = ptlrpc_resend(imp);
1186                 if (rc)
1187                         GOTO(out, rc);
1188                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
1189                 ptlrpc_activate_import(imp);
1190
1191                 deuuidify(obd2cli_tgt(imp->imp_obd), NULL,
1192                           &target_start, &target_len);
1193                 LCONSOLE_INFO("%s: Connection restored to service %.*s "
1194                               "using nid %s.\n", imp->imp_obd->obd_name,
1195                               target_len, target_start,
1196                               libcfs_nid2str(imp->imp_connection->c_peer.nid));
1197         }
1198
1199         if (imp->imp_state == LUSTRE_IMP_FULL) {
1200                 cfs_waitq_signal(&imp->imp_recovery_waitq);
1201                 ptlrpc_wake_delayed(imp);
1202         }
1203
1204 out:
1205         RETURN(rc);
1206 }
1207
1208 static int back_to_sleep(void *unused)
1209 {
1210         return 0;
1211 }
1212
1213 int ptlrpc_disconnect_import(struct obd_import *imp, int noclose)
1214 {
1215         struct ptlrpc_request *req;
1216         int rq_opc, rc = 0;
1217         int nowait = imp->imp_obd->obd_force;
1218         ENTRY;
1219
1220         if (nowait)
1221                 GOTO(set_state, rc);
1222
1223         switch (imp->imp_connect_op) {
1224         case OST_CONNECT: rq_opc = OST_DISCONNECT; break;
1225         case MDS_CONNECT: rq_opc = MDS_DISCONNECT; break;
1226         case MGS_CONNECT: rq_opc = MGS_DISCONNECT; break;
1227         default:
1228                 CERROR("don't know how to disconnect from %s (connect_op %d)\n",
1229                        obd2cli_tgt(imp->imp_obd), imp->imp_connect_op);
1230                 RETURN(-EINVAL);
1231         }
1232
1233         if (ptlrpc_import_in_recovery(imp)) {
1234                 struct l_wait_info lwi;
1235                 cfs_duration_t timeout;
1236
1237
1238                 if (AT_OFF) {
1239                         if (imp->imp_server_timeout)
1240                                 timeout = cfs_time_seconds(obd_timeout / 2);
1241                         else
1242                                 timeout = cfs_time_seconds(obd_timeout);
1243                 } else {
1244                         int idx = import_at_get_index(imp,
1245                                 imp->imp_client->cli_request_portal);
1246                         timeout = cfs_time_seconds(
1247                                 at_get(&imp->imp_at.iat_service_estimate[idx]));
1248                 }
1249
1250                 lwi = LWI_TIMEOUT_INTR(cfs_timeout_cap(timeout),
1251                                        back_to_sleep, LWI_ON_SIGNAL_NOOP, NULL);
1252                 rc = l_wait_event(imp->imp_recovery_waitq,
1253                                   !ptlrpc_import_in_recovery(imp), &lwi);
1254
1255         }
1256
1257         spin_lock(&imp->imp_lock);
1258         if (imp->imp_state != LUSTRE_IMP_FULL)
1259                 GOTO(out, 0);
1260
1261         spin_unlock(&imp->imp_lock);
1262
1263         req = ptlrpc_request_alloc_pack(imp, &RQF_MDS_DISCONNECT,
1264                                         LUSTRE_OBD_VERSION, rq_opc);
1265         if (req) {
1266                 /* We are disconnecting, do not retry a failed DISCONNECT rpc if
1267                  * it fails.  We can get through the above with a down server
1268                  * if the client doesn't know the server is gone yet. */
1269                 req->rq_no_resend = 1;
1270
1271 #ifndef CRAY_XT3
1272                 /* We want client umounts to happen quickly, no matter the
1273                    server state... */
1274                 req->rq_timeout = min_t(int, req->rq_timeout,
1275                                         INITIAL_CONNECT_TIMEOUT);
1276 #else
1277                 /* ... but we always want liblustre clients to nicely
1278                    disconnect, so only use the adaptive value. */
1279                 if (AT_OFF)
1280                         req->rq_timeout = obd_timeout / 3;
1281 #endif
1282
1283                 IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
1284                 req->rq_send_state =  LUSTRE_IMP_CONNECTING;
1285                 ptlrpc_request_set_replen(req);
1286                 rc = ptlrpc_queue_wait(req);
1287                 ptlrpc_req_finished(req);
1288         }
1289
1290 set_state:
1291         spin_lock(&imp->imp_lock);
1292 out:
1293         if (noclose)
1294                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
1295         else
1296                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
1297         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
1298         imp->imp_conn_cnt = 0;
1299         /* Try all connections in the future - bz 12758 */
1300         imp->imp_last_recon = 0;
1301         spin_unlock(&imp->imp_lock);
1302
1303         RETURN(rc);
1304 }
1305
1306
1307 /* Adaptive Timeout utils */
1308 extern unsigned int at_min, at_max, at_history;
1309
1310 /* Bin into timeslices using AT_BINS bins.
1311    This gives us a max of the last binlimit*AT_BINS secs without the storage,
1312    but still smoothing out a return to normalcy from a slow response.
1313    (E.g. remember the maximum latency in each minute of the last 4 minutes.) */
1314 int at_add(struct adaptive_timeout *at, unsigned int val)
1315 {
1316         unsigned int old = at->at_current;
1317         time_t now = cfs_time_current_sec();
1318         time_t binlimit = max_t(time_t, at_history / AT_BINS, 1);
1319
1320         LASSERT(at);
1321 #if 0
1322         CDEBUG(D_INFO, "add %u to %p time=%lu v=%u (%u %u %u %u)\n",
1323                val, at, now - at->at_binstart, at->at_current,
1324                at->at_hist[0], at->at_hist[1], at->at_hist[2], at->at_hist[3]);
1325 #endif
1326         if (val == 0)
1327                 /* 0's don't count, because we never want our timeout to
1328                    drop to 0, and because 0 could mean an error */
1329                 return 0;
1330
1331         spin_lock(&at->at_lock);
1332
1333         if (unlikely(at->at_binstart == 0)) {
1334                 /* Special case to remove default from history */
1335                 at->at_current = val;
1336                 at->at_worst_ever = val;
1337                 at->at_worst_time = now;
1338                 at->at_hist[0] = val;
1339                 at->at_binstart = now;
1340         } else if (now - at->at_binstart < binlimit ) {
1341                 /* in bin 0 */
1342                 at->at_hist[0] = max(val, at->at_hist[0]);
1343                 at->at_current = max(val, at->at_current);
1344         } else {
1345                 int i, shift;
1346                 unsigned int maxv = val;
1347                 /* move bins over */
1348                 shift = (now - at->at_binstart) / binlimit;
1349                 LASSERT(shift > 0);
1350                 for(i = AT_BINS - 1; i >= 0; i--) {
1351                         if (i >= shift) {
1352                                 at->at_hist[i] = at->at_hist[i - shift];
1353                                 maxv = max(maxv, at->at_hist[i]);
1354                         } else {
1355                                 at->at_hist[i] = 0;
1356                         }
1357                 }
1358                 at->at_hist[0] = val;
1359                 at->at_current = maxv;
1360                 at->at_binstart += shift * binlimit;
1361         }
1362
1363         if (at->at_current > at->at_worst_ever) {
1364                 at->at_worst_ever = at->at_current;
1365                 at->at_worst_time = now;
1366         }
1367
1368         if (at->at_flags & AT_FLG_NOHIST)
1369                 /* Only keep last reported val; keeping the rest of the history
1370                    for proc only */
1371                 at->at_current = val;
1372
1373         if (at_max > 0)
1374                 at->at_current =  min(at->at_current, at_max);
1375         at->at_current =  max(at->at_current, at_min);
1376
1377 #if 0
1378         if (at->at_current != old)
1379                 CDEBUG(D_ADAPTTO, "AT %p change: old=%u new=%u delta=%d "
1380                        "(val=%u) hist %u %u %u %u\n", at,
1381                        old, at->at_current, at->at_current - old, val,
1382                        at->at_hist[0], at->at_hist[1], at->at_hist[2],
1383                        at->at_hist[3]);
1384 #endif
1385
1386         /* if we changed, report the old value */
1387         old = (at->at_current != old) ? old : 0;
1388
1389         spin_unlock(&at->at_lock);
1390         return old;
1391 }
1392
1393 /* Find the imp_at index for a given portal; assign if space available */
1394 int import_at_get_index(struct obd_import *imp, int portal)
1395 {
1396         struct imp_at *at = &imp->imp_at;
1397         int i;
1398
1399         for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
1400                 if (at->iat_portal[i] == portal)
1401                         return i;
1402                 if (at->iat_portal[i] == 0)
1403                         /* unused */
1404                         break;
1405         }
1406
1407         /* Not found in list, add it under a lock */
1408         spin_lock(&imp->imp_lock);
1409
1410         /* Check unused under lock */
1411         for (; i < IMP_AT_MAX_PORTALS; i++) {
1412                 if (at->iat_portal[i] == portal)
1413                         goto out;
1414                 if (at->iat_portal[i] == 0)
1415                         /* unused */
1416                         break;
1417         }
1418
1419         /* Not enough portals? */
1420         LASSERT(i < IMP_AT_MAX_PORTALS);
1421
1422         at->iat_portal[i] = portal;
1423 out:
1424         spin_unlock(&imp->imp_lock);
1425         return i;
1426 }