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 Lustre, http://www.lustre.org.
   8  *
   9  *   Lustre is free software; you can redistribute it and/or
  10  *   modify it under the terms of version 2 of the GNU General Public
  11  *   License as published by the Free Software Foundation.
  12  *
  13  *   Lustre is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with Lustre; if not, write to the Free Software
  20  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #define DEBUG_SUBSYSTEM S_RPC
  24 #ifndef __KERNEL__
  25 # include <liblustre.h>
  26 #endif
  27
  28 #include <linux/obd_support.h>
  29 #include <linux/lustre_ha.h>
  30 #include <linux/lustre_net.h>
  31 #include <linux/lustre_import.h>
  32 #include <linux/lustre_export.h>
  33 #include <linux/obd.h>
  34 #include <linux/obd_class.h>
  35 #include <linux/lustre_sec.h>
  36
  37 #include "ptlrpc_internal.h"
  38
  39 struct ptlrpc_connect_async_args {
  40          __u64 pcaa_peer_committed;
  41         int pcaa_initial_connect;
  42 };
  43
  44 /* A CLOSED import should remain so. */
  45 #define IMPORT_SET_STATE_NOLOCK(imp, state)                                    \
  46 do {                                                                           \
  47         if (imp->imp_state != LUSTRE_IMP_CLOSED) {                             \
  48                CDEBUG(D_HA, "%p %s: changing import state from %s to %s\n",    \
  49                       imp, imp->imp_target_uuid.uuid,                          \
  50                       ptlrpc_import_state_name(imp->imp_state),                \
  51                       ptlrpc_import_state_name(state));                        \
  52                imp->imp_state = state;                                         \
  53         }                                                                      \
  54 } while(0)
  55
  56 #define IMPORT_SET_STATE(imp, state)                    \
  57 do {                                                    \
  58         unsigned long flags;                            \
  59                                                         \
  60         spin_lock_irqsave(&imp->imp_lock, flags);       \
  61         IMPORT_SET_STATE_NOLOCK(imp, state);            \
  62         spin_unlock_irqrestore(&imp->imp_lock, flags);  \
  63 } while(0)
  64
  65
  66 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
  67                                     void * data, int rc);
  68 int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
  69
  70 /* Only this function is allowed to change the import state when it is
  71  * CLOSED. I would rather refcount the import and free it after
  72  * disconnection like we do with exports. To do that, the client_obd
  73  * will need to save the peer info somewhere other than in the import,
  74  * though. */
  75 int ptlrpc_init_import(struct obd_import *imp)
  76 {
  77         unsigned long flags;
  78
  79         spin_lock_irqsave(&imp->imp_lock, flags);
  80
  81         imp->imp_generation++;
  82         imp->imp_state =  LUSTRE_IMP_NEW;
  83
  84         spin_unlock_irqrestore(&imp->imp_lock, flags);
  85
  86         return 0;
  87 }
  88
  89 /* Returns true if import was FULL, false if import was already not
  90  * connected.
  91  */
  92 int ptlrpc_set_import_discon(struct obd_import *imp)
  93 {
  94         unsigned long flags;
  95         int rc = 0;
  96
  97         spin_lock_irqsave(&imp->imp_lock, flags);
  98
  99         if (imp->imp_state == LUSTRE_IMP_FULL) {
 100                 CWARN("%s: connection lost to %s@%s\n",
 101                       imp->imp_obd->obd_name,
 102                       imp->imp_target_uuid.uuid,
 103                       imp->imp_connection->c_remote_uuid.uuid);
 104                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
 105                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 106                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
 107                 rc = 1;
 108         } else {
 109                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 110                 CDEBUG(D_HA, "%p %s: import already not connected: %s\n",
 111                        imp,imp->imp_client->cli_name,
 112                        ptlrpc_import_state_name(imp->imp_state));
 113         }
 114
 115         return rc;
 116 }
 117
 118 /*
 119  * This acts as a barrier; all existing requests are rejected, and
 120  * no new requests will be accepted until the import is valid again.
 121  */
 122 void ptlrpc_deactivate_import(struct obd_import *imp)
 123 {
 124         unsigned long flags;
 125         ENTRY;
 126
 127         spin_lock_irqsave(&imp->imp_lock, flags);
 128         CDEBUG(D_HA, "setting import %s INVALID\n",
 129                imp->imp_target_uuid.uuid);
 130         imp->imp_invalid = 1;
 131         imp->imp_generation++;
 132         spin_unlock_irqrestore(&imp->imp_lock, flags);
 133
 134         ptlrpc_abort_inflight(imp);
 135         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
 136 }
 137
 138 /*
 139  * This function will invalidate the import, if necessary, then block
 140  * for all the RPC completions, and finally notify the obd to
 141  * invalidate its state (ie cancel locks, clear pending requests,
 142  * etc).
 143  *
 144  * in_rpc: true if this is called while processing an rpc, like
 145  *    CONNECT. It will allow for one RPC to be inflight while
 146  *    waiting for requests to complete. Ugly, yes, but I don't see an
 147  *    cleaner way right now.
 148  */
 149 void ptlrpc_invalidate_import(struct obd_import *imp, int in_rpc)
 150 {
 151         struct l_wait_info lwi;
 152         unsigned long timeout;
 153         int inflight = 0;
 154         int rc;
 155
 156         if (!imp->imp_invalid)
 157                 ptlrpc_deactivate_import(imp);
 158
 159         LASSERT(imp->imp_invalid);
 160
 161         if (in_rpc)
 162                 inflight = 1;
 163
 164         /* wait for all requests to error out and call completion
 165            callbacks */
 166         if (imp->imp_server_timeout)
 167                 timeout = obd_timeout / 2;
 168         else
 169                 timeout = obd_timeout;
 170         timeout = MAX(timeout * HZ, 1);
 171         lwi = LWI_TIMEOUT_INTR(timeout, NULL, NULL, NULL);
 172         rc = l_wait_event(imp->imp_recovery_waitq,
 173                           (atomic_read(&imp->imp_inflight) == inflight),
 174                           &lwi);
 175
 176         if (rc)
 177                 CERROR("%s: rc = %d waiting for callback (%d != %d)\n",
 178                        imp->imp_target_uuid.uuid, rc,
 179                        atomic_read(&imp->imp_inflight), !!in_rpc);
 180
 181         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
 182 }
 183
 184 void ptlrpc_activate_import(struct obd_import *imp)
 185 {
 186         struct obd_device *obd = imp->imp_obd;
 187         unsigned long flags;
 188
 189         spin_lock_irqsave(&imp->imp_lock, flags);
 190         imp->imp_invalid = 0;
 191         spin_unlock_irqrestore(&imp->imp_lock, flags);
 192
 193         obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
 194 }
 195
 196 void ptlrpc_fail_import(struct obd_import *imp, int generation)
 197 {
 198         ENTRY;
 199
 200         LASSERT (!imp->imp_dlm_fake);
 201
 202         if (ptlrpc_set_import_discon(imp)) {
 203                 unsigned long flags;
 204
 205                 if (!imp->imp_replayable) {
 206                         CDEBUG(D_HA, "import %s@%s for %s not replayable, "
 207                                "auto-deactivating\n",
 208                                imp->imp_target_uuid.uuid,
 209                                imp->imp_connection->c_remote_uuid.uuid,
 210                                imp->imp_obd->obd_name);
 211                         ptlrpc_deactivate_import(imp);
 212                 }
 213
 214                 CDEBUG(D_HA, "%s: waking up pinger\n",
 215                        imp->imp_target_uuid.uuid);
 216
 217                 spin_lock_irqsave(&imp->imp_lock, flags);
 218                 imp->imp_force_verify = 1;
 219                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 220
 221                 ptlrpc_pinger_wake_up();
 222         }
 223         EXIT;
 224 }
 225
 226 #define ATTEMPT_TOO_SOON(last)  \
 227         ((last) && ((long)(jiffies - (last)) <= (long)(obd_timeout * 2 * HZ)))
 228
 229 static int import_select_connection(struct obd_import *imp)
 230 {
 231         struct obd_import_conn *imp_conn, *tmp;
 232         struct obd_export *dlmexp;
 233         int found = 0;
 234         ENTRY;
 235
 236         spin_lock(&imp->imp_lock);
 237
 238         if (list_empty(&imp->imp_conn_list)) {
 239                 CERROR("no available connections on imp %p@%s\n",
 240                         imp, imp->imp_obd->obd_name);
 241                 spin_unlock(&imp->imp_lock);
 242                 RETURN(-EINVAL);
 243         }
 244
 245         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 246                 if (!ATTEMPT_TOO_SOON(imp_conn->oic_last_attempt)) {
 247                         found = 1;
 248                         break;
 249                 }
 250         }
 251
 252         /* if not found, simply choose the current one */
 253         if (!found) {
 254                 CWARN("obd %s imp 0x%p: all connections have been "
 255                       "tried recently\n", imp->imp_obd->obd_name, imp);
 256                 LASSERT(imp->imp_conn_current);
 257                 imp_conn = imp->imp_conn_current;
 258         }
 259         LASSERT(imp_conn->oic_conn);
 260
 261         imp_conn->oic_last_attempt = jiffies;
 262
 263         /* move the items ahead of the selected one to list tail */
 264         while (1) {
 265                 tmp= list_entry(imp->imp_conn_list.next,
 266                                 struct obd_import_conn, oic_item);
 267                 if (tmp == imp_conn)
 268                         break;
 269                 list_del(&tmp->oic_item);
 270                 list_add_tail(&tmp->oic_item, &imp->imp_conn_list);
 271         }
 272
 273         /* switch connection if we chose a new one */
 274         if (imp->imp_connection != imp_conn->oic_conn) {
 275                 if (imp->imp_connection) {
 276                         ptlrpcs_sec_invalidate_cache(imp->imp_sec);
 277                         ptlrpc_put_connection(imp->imp_connection);
 278                 }
 279                 imp->imp_connection =
 280                         ptlrpc_connection_addref(imp_conn->oic_conn);
 281         }
 282
 283         dlmexp =  class_conn2export(&imp->imp_dlm_handle);
 284         LASSERT(dlmexp != NULL);
 285         if (dlmexp->exp_connection)
 286                 ptlrpc_put_connection(imp->imp_connection);
 287         dlmexp->exp_connection = ptlrpc_connection_addref(imp_conn->oic_conn);
 288         class_export_put(dlmexp);
 289
 290         imp->imp_conn_current = imp_conn;
 291         CWARN("obd %s imp 0x%p: select conn %s\n",
 292                imp->imp_obd->obd_name, imp,
 293                imp_conn->oic_uuid.uuid);
 294         spin_unlock(&imp->imp_lock);
 295
 296         RETURN(0);
 297 }
 298
 299
 300
 301 int ptlrpc_connect_import(struct obd_import *imp, char * new_uuid)
 302 {
 303         struct obd_device *obd = imp->imp_obd;
 304         int initial_connect = 0;
 305         int rc;
 306         __u64 committed_before_reconnect = 0;
 307         struct ptlrpc_request *request;
 308         int size[] = {sizeof(imp->imp_target_uuid),
 309                       sizeof(obd->obd_uuid),
 310                       sizeof(imp->imp_dlm_handle),
 311                       sizeof(unsigned long),
 312                       sizeof(__u32) * 2};
 313         char *tmp[] = {imp->imp_target_uuid.uuid,
 314                        obd->obd_uuid.uuid,
 315                        (char *)&imp->imp_dlm_handle,
 316                        (char *)&imp->imp_connect_flags, /* XXX: make this portable! */
 317                        (char*) &obd->u.cli.cl_nllu};
 318         struct ptlrpc_connect_async_args *aa;
 319         unsigned long flags;
 320
 321         spin_lock_irqsave(&imp->imp_lock, flags);
 322         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 323                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 324                 CERROR("can't connect to a closed import\n");
 325                 RETURN(-EINVAL);
 326         } else if (imp->imp_state == LUSTRE_IMP_FULL) {
 327                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 328                 CERROR("already connected\n");
 329                 RETURN(0);
 330         } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
 331                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 332                 CERROR("already connecting\n");
 333                 RETURN(-EALREADY);
 334         }
 335
 336         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
 337
 338         imp->imp_resend_replay = 0;
 339
 340         if (imp->imp_remote_handle.cookie == 0) {
 341                 initial_connect = 1;
 342         } else {
 343                 committed_before_reconnect = imp->imp_peer_committed_transno;;
 344                 imp->imp_conn_cnt++;
 345         }
 346
 347
 348         spin_unlock_irqrestore(&imp->imp_lock, flags);
 349
 350         if (new_uuid) {
 351                 struct obd_uuid uuid;
 352
 353                 obd_str2uuid(&uuid, new_uuid);
 354
 355                 rc = import_set_conn_priority(imp, &uuid);
 356                 if (rc)
 357                         GOTO(out, rc);
 358         }
 359         rc = import_select_connection(imp);
 360         if (rc)
 361                 GOTO(out, rc);
 362
 363         LASSERT(imp->imp_sec);
 364
 365         request = ptlrpc_prep_req(imp, LUSTRE_OBD_VERSION,
 366                                   imp->imp_connect_op, 5, size, tmp);
 367         if (!request)
 368                 GOTO(out, rc = -ENOMEM);
 369
 370 #ifndef __KERNEL__
 371         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_LIBCLIENT);
 372 #endif
 373         if (obd->u.cli.cl_async) {
 374                 lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_ASYNC);
 375         }
 376
 377         request->rq_send_state = LUSTRE_IMP_CONNECTING;
 378         request->rq_replen = lustre_msg_size(0, NULL);
 379         request->rq_interpret_reply = ptlrpc_connect_interpret;
 380
 381         LASSERT (sizeof (*aa) <= sizeof (request->rq_async_args));
 382         aa = (struct ptlrpc_connect_async_args *)&request->rq_async_args;
 383         memset(aa, 0, sizeof *aa);
 384
 385         aa->pcaa_peer_committed = committed_before_reconnect;
 386         aa->pcaa_initial_connect = initial_connect;
 387
 388         if (aa->pcaa_initial_connect) {
 389                 lustre_msg_add_op_flags(request->rq_reqmsg,
 390                                         MSG_CONNECT_INITIAL);
 391                 imp->imp_replayable = 1;
 392         }
 393
 394         ptlrpcd_add_req(request);
 395         rc = 0;
 396         imp->imp_connect_start = jiffies;
 397 out:
 398         if (rc != 0) {
 399                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 400         }
 401
 402         RETURN(rc);
 403 }
 404
 405 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
 406                                     void *data, int rc)
 407 {
 408         struct ptlrpc_connect_async_args *aa = data;
 409         struct obd_import *imp = request->rq_import;
 410         struct lustre_handle old_hdl;
 411         unsigned long flags;
 412         int msg_flags;
 413         ENTRY;
 414
 415         spin_lock_irqsave(&imp->imp_lock, flags);
 416         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 417                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 418                 RETURN(0);
 419         }
 420         spin_unlock_irqrestore(&imp->imp_lock, flags);
 421
 422         if (rc)
 423                 GOTO(out, rc);
 424         LASSERT(imp->imp_conn_current);
 425         imp->imp_conn_current->oic_last_attempt = 0;
 426
 427         msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
 428
 429         if (aa->pcaa_initial_connect) {
 430                 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
 431                         CDEBUG(D_HA, "connected to replayable target: %s\n",
 432                                imp->imp_target_uuid.uuid);
 433                         imp->imp_pingable = imp->imp_replayable = 1;
 434                 } else {
 435                         imp->imp_replayable = 0;
 436                 }
 437                 LASSERTF(imp->imp_conn_cnt < request->rq_repmsg->conn_cnt,
 438                          "imp conn_cnt %d req conn_cnt %d",
 439                          imp->imp_conn_cnt, request->rq_repmsg->conn_cnt);
 440                 imp->imp_conn_cnt = request->rq_repmsg->conn_cnt;
 441                 imp->imp_remote_handle = request->rq_repmsg->handle;
 442                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 443                 GOTO(finish, rc = 0);
 444         }
 445
 446         /* Determine what recovery state to move the import to. */
 447         if (MSG_CONNECT_RECONNECT & msg_flags) {
 448                 memset(&old_hdl, 0, sizeof(old_hdl));
 449                 if (!memcmp(&old_hdl, &request->rq_repmsg->handle,
 450                             sizeof (old_hdl))) {
 451                         CERROR("%s@%s didn't like our handle "LPX64
 452                                ", failed\n", imp->imp_target_uuid.uuid,
 453                                imp->imp_connection->c_remote_uuid.uuid,
 454                                imp->imp_dlm_handle.cookie);
 455                         GOTO(out, rc = -ENOTCONN);
 456                 }
 457
 458                 if (memcmp(&imp->imp_remote_handle, &request->rq_repmsg->handle,
 459                            sizeof(imp->imp_remote_handle))) {
 460                         CERROR("%s@%s changed handle from "LPX64" to "LPX64
 461                                "; copying, but this may foreshadow disaster\n",
 462                                imp->imp_target_uuid.uuid,
 463                                imp->imp_connection->c_remote_uuid.uuid,
 464                                imp->imp_remote_handle.cookie,
 465                                request->rq_repmsg->handle.cookie);
 466                         imp->imp_remote_handle = request->rq_repmsg->handle;
 467                 } else {
 468                         CDEBUG(D_HA, "reconnected to %s@%s after partition\n",
 469                                imp->imp_target_uuid.uuid,
 470                                imp->imp_connection->c_remote_uuid.uuid);
 471                 }
 472
 473                 if (imp->imp_invalid) {
 474                         IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 475                 } else if (MSG_CONNECT_RECOVERING & msg_flags) {
 476                         CDEBUG(D_HA, "%s: reconnected to %s during replay\n",
 477                                imp->imp_obd->obd_name,
 478                                imp->imp_target_uuid.uuid);
 479                         imp->imp_resend_replay = 1;
 480                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 481                 } else {
 482                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 483                 }
 484         } else if ((MSG_CONNECT_RECOVERING & msg_flags) && !imp->imp_invalid) {
 485                 LASSERT(imp->imp_replayable);
 486                 imp->imp_remote_handle = request->rq_repmsg->handle;
 487                 imp->imp_last_replay_transno = 0;
 488                 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 489         } else {
 490                 CDEBUG(D_HA, "oops! we get evicted from %s\n", imp->imp_target_uuid.uuid);
 491                 imp->imp_remote_handle = request->rq_repmsg->handle;
 492                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 493         }
 494
 495         /* Sanity checks for a reconnected import. */
 496         if (!(imp->imp_replayable) != !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
 497                 CERROR("imp_replayable flag does not match server "
 498                        "after reconnect. We should LBUG right here.\n");
 499         }
 500
 501         if (request->rq_repmsg->last_committed < aa->pcaa_peer_committed) {
 502                 CERROR("%s went back in time (transno "LPD64
 503                        " was previously committed, server now claims "LPD64
 504                        ")! is shared storage not coherent?\n",
 505                        imp->imp_target_uuid.uuid,
 506                        aa->pcaa_peer_committed,
 507                        request->rq_repmsg->last_committed);
 508         }
 509
 510 finish:
 511         rc = ptlrpc_import_recovery_state_machine(imp);
 512         if (rc != 0) {
 513                 if (rc == -ENOTCONN) {
 514                         CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
 515                                "invalidating and reconnecting\n",
 516                                imp->imp_target_uuid.uuid,
 517                                imp->imp_connection->c_remote_uuid.uuid);
 518                         ptlrpc_connect_import(imp, NULL);
 519                         RETURN(0);
 520                 }
 521         }
 522  out:
 523         if (rc != 0) {
 524                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 525                 if (aa->pcaa_initial_connect && !imp->imp_initial_recov)
 526                         ptlrpc_deactivate_import(imp);
 527                 CDEBUG(D_HA, "recovery of %s on %s failed (%d)\n",
 528                        imp->imp_target_uuid.uuid,
 529                        (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
 530         }
 531
 532         wake_up(&imp->imp_recovery_waitq);
 533         RETURN(rc);
 534 }
 535
 536 static int completed_replay_interpret(struct ptlrpc_request *req,
 537                                       void *data, int rc)
 538 {
 539         atomic_dec(&req->rq_import->imp_replay_inflight);
 540         if (req->rq_status == 0) {
 541                 ptlrpc_import_recovery_state_machine(req->rq_import);
 542         } else {
 543                 CDEBUG(D_HA, "%s: LAST_REPLAY message error: %d, "
 544                        "reconnecting\n",
 545                        req->rq_import->imp_obd->obd_name, req->rq_status);
 546                 ptlrpc_connect_import(req->rq_import, NULL);
 547         }
 548
 549         RETURN(0);
 550 }
 551
 552 static int signal_completed_replay(struct obd_import *imp)
 553  {
 554         struct ptlrpc_request *req;
 555         ENTRY;
 556
 557         LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
 558         atomic_inc(&imp->imp_replay_inflight);
 559
 560         req = ptlrpc_prep_req(imp, LUSTRE_OBD_VERSION, OBD_PING, 0, NULL, NULL);
 561         if (!req) {
 562                 atomic_dec(&imp->imp_replay_inflight);
 563                 RETURN(-ENOMEM);
 564         }
 565
 566         req->rq_replen = lustre_msg_size(0, NULL);
 567         req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
 568         req->rq_reqmsg->flags |= MSG_LAST_REPLAY;
 569         req->rq_timeout *= 3;
 570         req->rq_interpret_reply = completed_replay_interpret;
 571
 572         ptlrpcd_add_req(req);
 573         RETURN(0);
 574 }
 575
 576 #ifdef __KERNEL__
 577 static int ptlrpc_invalidate_import_thread(void *data)
 578 {
 579         struct obd_import *imp = data;
 580         unsigned long flags;
 581
 582         ENTRY;
 583
 584         lock_kernel();
 585         ptlrpc_daemonize();
 586
 587         SIGNAL_MASK_LOCK(current, flags);
 588         sigfillset(&current->blocked);
 589         RECALC_SIGPENDING;
 590         SIGNAL_MASK_UNLOCK(current, flags);
 591         THREAD_NAME(current->comm, sizeof(current->comm), "ll_imp_inval");
 592         unlock_kernel();
 593
 594         CDEBUG(D_HA, "thread invalidate import %s to %s@%s\n",
 595                imp->imp_obd->obd_name, imp->imp_target_uuid.uuid,
 596                imp->imp_connection->c_remote_uuid.uuid);
 597
 598         ptlrpc_invalidate_import(imp, 0);
 599         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 600
 601         ptlrpc_import_recovery_state_machine(imp);
 602
 603         RETURN(0);
 604 }
 605 #endif
 606
 607 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
 608 {
 609         int rc = 0;
 610         int inflight;
 611
 612         if (imp->imp_state == LUSTRE_IMP_EVICTED) {
 613                 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
 614                        imp->imp_target_uuid.uuid,
 615                        imp->imp_connection->c_remote_uuid.uuid);
 616
 617 #ifdef __KERNEL__
 618                 rc = kernel_thread(ptlrpc_invalidate_import_thread, imp,
 619                                    CLONE_VM | CLONE_FILES);
 620                 if (rc < 0)
 621                         CERROR("error starting invalidate thread: %d\n", rc);
 622                 RETURN(rc);
 623 #else
 624                 ptlrpc_invalidate_import(imp, 1);
 625
 626                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 627 #endif
 628         }
 629
 630         if (imp->imp_state == LUSTRE_IMP_REPLAY) {
 631                 CDEBUG(D_HA, "replay requested by %s\n",
 632                        imp->imp_target_uuid.uuid);
 633                 rc = ptlrpc_replay_next(imp, &inflight);
 634                 if (inflight == 0 &&
 635                     atomic_read(&imp->imp_replay_inflight) == 0) {
 636                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
 637                         rc = ldlm_replay_locks(imp);
 638                         if (rc)
 639                                 GOTO(out, rc);
 640                 }
 641                 rc = 0;
 642         }
 643
 644         if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
 645                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
 646                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
 647                         rc = signal_completed_replay(imp);
 648                         if (rc)
 649                                 GOTO(out, rc);
 650                 }
 651
 652         }
 653
 654         if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
 655                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
 656                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 657                 }
 658         }
 659
 660         if (imp->imp_state == LUSTRE_IMP_RECOVER) {
 661                 CDEBUG(D_HA, "reconnected to %s@%s\n",
 662                        imp->imp_target_uuid.uuid,
 663                        imp->imp_connection->c_remote_uuid.uuid);
 664
 665                 rc = ptlrpc_resend(imp);
 666                 if (rc)
 667                         GOTO(out, rc);
 668                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 669                 ptlrpc_activate_import(imp);
 670                 CWARN("%s: connection restored to %s@%s\n",
 671                       imp->imp_obd->obd_name,
 672                       imp->imp_target_uuid.uuid,
 673                       imp->imp_connection->c_remote_uuid.uuid);
 674         }
 675
 676         if (imp->imp_state == LUSTRE_IMP_FULL) {
 677                 wake_up(&imp->imp_recovery_waitq);
 678                 ptlrpc_wake_delayed(imp);
 679         }
 680
 681  out:
 682         RETURN(rc);
 683 }
 684
 685 static int back_to_sleep(void *unused)
 686 {
 687         return 0;
 688 }
 689
 690 int ptlrpc_disconnect_import(struct obd_import *imp)
 691 {
 692         struct ptlrpc_request *request;
 693         int rq_opc;
 694         int rc = 0;
 695         unsigned long flags;
 696         ENTRY;
 697
 698         switch (imp->imp_connect_op) {
 699         case OST_CONNECT: rq_opc = OST_DISCONNECT; break;
 700         case MDS_CONNECT: rq_opc = MDS_DISCONNECT; break;
 701         case MGMT_CONNECT: rq_opc = MGMT_DISCONNECT; break;
 702         default:
 703                 CERROR("don't know how to disconnect from %s (connect_op %d)\n",
 704                        imp->imp_target_uuid.uuid, imp->imp_connect_op);
 705                 RETURN(-EINVAL);
 706         }
 707
 708
 709         if (ptlrpc_import_in_recovery(imp)) {
 710                 struct l_wait_info lwi;
 711                 unsigned long timeout;
 712                 if (imp->imp_server_timeout)
 713                         timeout = obd_timeout / 2;
 714                 else
 715                         timeout = obd_timeout;
 716                 timeout = MAX(timeout * HZ, 1);
 717                 lwi = LWI_TIMEOUT_INTR(obd_timeout, back_to_sleep, NULL, NULL);
 718                 rc = l_wait_event(imp->imp_recovery_waitq,
 719                                   !ptlrpc_import_in_recovery(imp), &lwi);
 720
 721         }
 722
 723         spin_lock_irqsave(&imp->imp_lock, flags);
 724         if (imp->imp_state != LUSTRE_IMP_FULL) {
 725                 GOTO(out, 0);
 726         }
 727         spin_unlock_irqrestore(&imp->imp_lock, flags);
 728
 729         request = ptlrpc_prep_req(imp, LUSTRE_OBD_VERSION, rq_opc,
 730                                   0, NULL, NULL);
 731         if (request) {
 732                 /* For non-replayable connections, don't attempt
 733                    reconnect if this fails */
 734                 if (!imp->imp_replayable) {
 735                         request->rq_no_resend = 1;
 736                         IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
 737                         request->rq_send_state =  LUSTRE_IMP_CONNECTING;
 738                 }
 739                 request->rq_replen = lustre_msg_size(0, NULL);
 740                 rc = ptlrpc_queue_wait(request);
 741                 ptlrpc_req_finished(request);
 742         }
 743
 744         spin_lock_irqsave(&imp->imp_lock, flags);
 745 out:
 746         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
 747         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
 748         imp->imp_conn_cnt = 0;
 749         spin_unlock_irqrestore(&imp->imp_lock, flags);
 750
 751         RETURN(rc);
 752 }
 753