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 #ifdef __KERNEL__
  25 # include <linux/config.h>
  26 # include <linux/module.h>
  27 # include <linux/kmod.h>
  28 #else
  29 # include <liblustre.h>
  30 #endif
  31
  32 #include <linux/obd_support.h>
  33 #include <linux/lustre_ha.h>
  34 #include <linux/lustre_net.h>
  35 #include <linux/lustre_import.h>
  36 #include <linux/lustre_export.h>
  37 #include <linux/obd.h>
  38 #include <linux/obd_class.h>
  39
  40 #include "ptlrpc_internal.h"
  41
  42 struct ptlrpc_connect_async_args {
  43          __u64 pcaa_peer_committed;
  44         int pcaa_initial_connect;
  45 };
  46
  47 /* A CLOSED import should remain so. */
  48 #define IMPORT_SET_STATE_NOLOCK(imp, state)                                    \
  49 do {                                                                           \
  50         if (imp->imp_state != LUSTRE_IMP_CLOSED) {                             \
  51                CDEBUG(D_HA, "%p %s: changing import state from %s to %s\n",    \
  52                       imp, imp->imp_target_uuid.uuid,                          \
  53                       ptlrpc_import_state_name(imp->imp_state),                \
  54                       ptlrpc_import_state_name(state));                        \
  55                imp->imp_state = state;                                         \
  56         }                                                                      \
  57 } while(0)
  58
  59 #define IMPORT_SET_STATE(imp, state)                    \
  60 do {                                                    \
  61         unsigned long flags;                            \
  62                                                         \
  63         spin_lock_irqsave(&imp->imp_lock, flags);       \
  64         IMPORT_SET_STATE_NOLOCK(imp, state);            \
  65         spin_unlock_irqrestore(&imp->imp_lock, flags);  \
  66 } while(0)
  67
  68
  69 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
  70                                     void * data, int rc);
  71 int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
  72
  73 /* Only this function is allowed to change the import state when it is
  74  * CLOSED. I would rather refcount the import and free it after
  75  * disconnection like we do with exports. To do that, the client_obd
  76  * will need to save the peer info somewhere other than in the import,
  77  * though. */
  78 int ptlrpc_init_import(struct obd_import *imp)
  79 {
  80         unsigned long flags;
  81
  82         spin_lock_irqsave(&imp->imp_lock, flags);
  83
  84         imp->imp_generation++;
  85         imp->imp_state =  LUSTRE_IMP_NEW;
  86
  87         spin_unlock_irqrestore(&imp->imp_lock, flags);
  88
  89         return 0;
  90 }
  91
  92 /* Returns true if import was FULL, false if import was already not
  93  * connected.
  94  */
  95 int ptlrpc_set_import_discon(struct obd_import *imp)
  96 {
  97         unsigned long flags;
  98         int rc = 0;
  99
 100         spin_lock_irqsave(&imp->imp_lock, flags);
 101
 102         if (imp->imp_state == LUSTRE_IMP_FULL) {
 103                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
 104                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 105                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DISCON);
 106                 rc = 1;
 107         } else {
 108                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 109                 CDEBUG(D_HA, "%p %s: import already not connected: %s\n",
 110                        imp,imp->imp_client->cli_name,
 111                        ptlrpc_import_state_name(imp->imp_state));
 112         }
 113
 114         return rc;
 115 }
 116
 117 /*
 118  * This acts as a barrier; all existing requests are rejected, and
 119  * no new requests will be accepted until the import is valid again.
 120  */
 121 void ptlrpc_deactivate_import(struct obd_import *imp)
 122 {
 123         unsigned long flags;
 124         ENTRY;
 125
 126         spin_lock_irqsave(&imp->imp_lock, flags);
 127         CDEBUG(D_HA, "setting import %s INVALID\n",
 128                imp->imp_target_uuid.uuid);
 129         imp->imp_invalid = 1;
 130         imp->imp_generation++;
 131         spin_unlock_irqrestore(&imp->imp_lock, flags);
 132
 133         ptlrpc_abort_inflight(imp);
 134         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INACTIVE);
 135 }
 136
 137 /*
 138  * This function will invalidate the import, if necessary, then block
 139  * for all the RPC completions, and finally notify the obd to
 140  * invalidate its state (ie cancel locks, clear pending requests,
 141  * etc).
 142  *
 143  * in_rpc: true if this is called while processing an rpc, like
 144  *    CONNECT. It will allow for one RPC to be inflight while
 145  *    waiting for requests to complete. Ugly, yes, but I don't see an
 146  *    cleaner way right now.
 147  */
 148 void ptlrpc_invalidate_import(struct obd_import *imp, int in_rpc)
 149 {
 150         struct l_wait_info lwi;
 151         unsigned long timeout;
 152         int inflight = 0;
 153         int rc;
 154
 155         if (!imp->imp_invalid)
 156                 ptlrpc_deactivate_import(imp);
 157
 158         LASSERT(imp->imp_invalid);
 159
 160         if (in_rpc)
 161                 inflight = 1;
 162
 163         /* wait for all requests to error out and call completion
 164            callbacks */
 165         if (imp->imp_server_timeout)
 166                 timeout = obd_timeout / 2;
 167         else
 168                 timeout = obd_timeout;
 169         timeout = MAX(timeout * HZ, 1);
 170         lwi = LWI_TIMEOUT_INTR(timeout, NULL, NULL, NULL);
 171         rc = l_wait_event(imp->imp_recovery_waitq,
 172                           (atomic_read(&imp->imp_inflight) == inflight),
 173                           &lwi);
 174
 175         if (rc)
 176                 CERROR("%s: rc = %d waiting for callback (%d != %d)\n",
 177                        imp->imp_target_uuid.uuid, rc,
 178                        atomic_read(&imp->imp_inflight), inflight);
 179
 180         obd_import_event(imp->imp_obd, imp, IMP_EVENT_INVALIDATE);
 181 }
 182
 183 void ptlrpc_activate_import(struct obd_import *imp)
 184 {
 185         struct obd_device *obd = imp->imp_obd;
 186         unsigned long flags;
 187
 188         spin_lock_irqsave(&imp->imp_lock, flags);
 189         imp->imp_invalid = 0;
 190         spin_unlock_irqrestore(&imp->imp_lock, flags);
 191
 192         obd_import_event(obd, imp, IMP_EVENT_ACTIVE);
 193 }
 194
 195 void ptlrpc_fail_import(struct obd_import *imp, int generation)
 196 {
 197         ENTRY;
 198
 199         LASSERT (!imp->imp_dlm_fake);
 200
 201         if (ptlrpc_set_import_discon(imp)) {
 202                 unsigned long flags;
 203
 204                 if (!imp->imp_replayable) {
 205                         CDEBUG(D_HA, "import %s@%s for %s not replayable, "
 206                                "auto-deactivating\n",
 207                                imp->imp_target_uuid.uuid,
 208                                imp->imp_connection->c_remote_uuid.uuid,
 209                                imp->imp_obd->obd_name);
 210                         ptlrpc_deactivate_import(imp);
 211                 }
 212
 213                 CDEBUG(D_HA, "%s: waking up pinger\n",
 214                        imp->imp_target_uuid.uuid);
 215
 216                 spin_lock_irqsave(&imp->imp_lock, flags);
 217                 imp->imp_force_verify = 1;
 218                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 219
 220                 ptlrpc_pinger_wake_up();
 221         }
 222         EXIT;
 223 }
 224
 225 int ptlrpc_connect_import(struct obd_import *imp, char * new_uuid)
 226 {
 227         struct obd_device *obd = imp->imp_obd;
 228         int initial_connect = 0;
 229         int rc;
 230         __u64 committed_before_reconnect = 0;
 231         struct ptlrpc_request *request;
 232         int size[] = {sizeof(imp->imp_target_uuid),
 233                                  sizeof(obd->obd_uuid),
 234                                  sizeof(imp->imp_dlm_handle)};
 235         char *tmp[] = {imp->imp_target_uuid.uuid,
 236                        obd->obd_uuid.uuid,
 237                        (char *)&imp->imp_dlm_handle};
 238         struct ptlrpc_connect_async_args *aa;
 239         unsigned long flags;
 240
 241         spin_lock_irqsave(&imp->imp_lock, flags);
 242         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 243                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 244                 CERROR("can't connect to a closed import\n");
 245                 RETURN(-EINVAL);
 246         } else if (imp->imp_state == LUSTRE_IMP_FULL) {
 247                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 248                 CERROR("already connected\n");
 249                 RETURN(0);
 250         } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
 251                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 252                 CERROR("already connecting\n");
 253                 RETURN(-EALREADY);
 254         }
 255
 256         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
 257
 258         imp->imp_resend_replay = 0;
 259
 260         if (imp->imp_remote_handle.cookie == 0) {
 261                 initial_connect = 1;
 262         } else {
 263                 committed_before_reconnect = imp->imp_peer_committed_transno;;
 264                 imp->imp_conn_cnt++;
 265         }
 266
 267
 268         spin_unlock_irqrestore(&imp->imp_lock, flags);
 269
 270         if (new_uuid) {
 271                 struct ptlrpc_connection *conn;
 272                 struct obd_uuid uuid;
 273                 struct obd_export *dlmexp;
 274
 275                 obd_str2uuid(&uuid, new_uuid);
 276
 277                 conn = ptlrpc_uuid_to_connection(&uuid);
 278                 if (!conn)
 279                         GOTO(out, rc = -ENOENT);
 280
 281                 CDEBUG(D_HA, "switching import %s/%s from %s to %s\n",
 282                        imp->imp_target_uuid.uuid, imp->imp_obd->obd_name,
 283                        imp->imp_connection->c_remote_uuid.uuid,
 284                        conn->c_remote_uuid.uuid);
 285
 286                 /* Switch the import's connection and the DLM export's
 287                  * connection (which are almost certainly the same, but we
 288                  * keep distinct refs just to make things clearer. I think. */
 289                 if (imp->imp_connection)
 290                         ptlrpc_put_connection(imp->imp_connection);
 291                 /* We hand off the ref from ptlrpc_get_connection. */
 292                 imp->imp_connection = conn;
 293
 294                 dlmexp = class_conn2export(&imp->imp_dlm_handle);
 295
 296                 LASSERT(dlmexp != NULL);
 297
 298                 if (dlmexp->exp_connection)
 299                         ptlrpc_put_connection(dlmexp->exp_connection);
 300                 dlmexp->exp_connection = ptlrpc_connection_addref(conn);
 301                 class_export_put(dlmexp);
 302
 303         }
 304
 305         request = ptlrpc_prep_req(imp, imp->imp_connect_op, 3, size, tmp);
 306         if (!request)
 307                 GOTO(out, rc = -ENOMEM);
 308
 309 #ifndef __KERNEL__
 310         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_LIBCLIENT);
 311 #endif
 312
 313         request->rq_send_state = LUSTRE_IMP_CONNECTING;
 314         request->rq_replen = lustre_msg_size(0, NULL);
 315         request->rq_interpret_reply = ptlrpc_connect_interpret;
 316
 317         LASSERT (sizeof (*aa) <= sizeof (request->rq_async_args));
 318         aa = (struct ptlrpc_connect_async_args *)&request->rq_async_args;
 319         memset(aa, 0, sizeof *aa);
 320
 321         aa->pcaa_peer_committed = committed_before_reconnect;
 322         aa->pcaa_initial_connect = initial_connect;
 323
 324         if (aa->pcaa_initial_connect) {
 325                 lustre_msg_add_op_flags(request->rq_reqmsg,
 326                                         MSG_CONNECT_INITIAL);
 327                 imp->imp_replayable = 1;
 328         }
 329
 330         ptlrpcd_add_req(request);
 331         rc = 0;
 332         imp->imp_connect_start = jiffies;
 333 out:
 334         if (rc != 0) {
 335                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 336         }
 337
 338         RETURN(rc);
 339 }
 340
 341 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
 342                                     void * data, int rc)
 343 {
 344         struct ptlrpc_connect_async_args *aa = data;
 345         struct obd_import *imp = request->rq_import;
 346         struct lustre_handle old_hdl;
 347         unsigned long flags;
 348         int msg_flags;
 349         ENTRY;
 350
 351         spin_lock_irqsave(&imp->imp_lock, flags);
 352         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 353                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 354                 RETURN(0);
 355         }
 356         spin_unlock_irqrestore(&imp->imp_lock, flags);
 357
 358         if (rc)
 359                 GOTO(out, rc);
 360
 361         msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
 362
 363         if (aa->pcaa_initial_connect) {
 364                 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
 365                         CDEBUG(D_HA, "connected to replayable target: %s\n",
 366                                imp->imp_target_uuid.uuid);
 367                         imp->imp_pingable = imp->imp_replayable = 1;
 368                 } else {
 369                         imp->imp_replayable = 0;
 370                 }
 371                 LASSERTF(imp->imp_conn_cnt < request->rq_repmsg->conn_cnt,
 372                          "imp conn_cnt %d req conn_cnt %d",
 373                          imp->imp_conn_cnt, request->rq_repmsg->conn_cnt);
 374                 imp->imp_conn_cnt = request->rq_repmsg->conn_cnt;
 375                 imp->imp_remote_handle = request->rq_repmsg->handle;
 376                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 377                 GOTO(finish, rc = 0);
 378         }
 379
 380         /* Determine what recovery state to move the import to. */
 381         if (MSG_CONNECT_RECONNECT & msg_flags) {
 382                 memset(&old_hdl, 0, sizeof(old_hdl));
 383                 if (!memcmp(&old_hdl, &request->rq_repmsg->handle,
 384                             sizeof (old_hdl))) {
 385                         CERROR("%s@%s didn't like our handle "LPX64
 386                                ", failed\n", imp->imp_target_uuid.uuid,
 387                                imp->imp_connection->c_remote_uuid.uuid,
 388                                imp->imp_dlm_handle.cookie);
 389                         GOTO(out, rc = -ENOTCONN);
 390                 }
 391
 392                 if (memcmp(&imp->imp_remote_handle, &request->rq_repmsg->handle,
 393                            sizeof(imp->imp_remote_handle))) {
 394                         CERROR("%s@%s changed handle from "LPX64" to "LPX64
 395                                "; copying, but this may foreshadow disaster\n",
 396                                imp->imp_target_uuid.uuid,
 397                                imp->imp_connection->c_remote_uuid.uuid,
 398                                imp->imp_remote_handle.cookie,
 399                                request->rq_repmsg->handle.cookie);
 400                         imp->imp_remote_handle = request->rq_repmsg->handle;
 401                 } else {
 402                         CERROR("reconnected to %s@%s after partition\n",
 403                                imp->imp_target_uuid.uuid,
 404                                imp->imp_connection->c_remote_uuid.uuid);
 405                 }
 406
 407                 if (imp->imp_invalid) {
 408                         IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 409                 } else if (MSG_CONNECT_RECOVERING & msg_flags) {
 410                         imp->imp_resend_replay = 1;
 411                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 412                 } else {
 413                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 414                 }
 415         } else if ((MSG_CONNECT_RECOVERING & msg_flags) && !imp->imp_invalid) {
 416                 LASSERT(imp->imp_replayable);
 417                 imp->imp_remote_handle = request->rq_repmsg->handle;
 418                 imp->imp_last_replay_transno = 0;
 419                 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 420         } else {
 421                 CWARN("oops! we get evicted from %s\n", imp->imp_target_uuid.uuid);
 422                 imp->imp_remote_handle = request->rq_repmsg->handle;
 423                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 424         }
 425
 426         /* Sanity checks for a reconnected import. */
 427         if (!(imp->imp_replayable) != !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
 428                 CERROR("imp_replayable flag does not match server "
 429                        "after reconnect. We should LBUG right here.\n");
 430         }
 431
 432         if (request->rq_repmsg->last_committed < aa->pcaa_peer_committed) {
 433                 CERROR("%s went back in time (transno "LPD64
 434                        " was previously committed, server now claims "LPD64
 435                        ")! is shared storage not coherent?\n",
 436                        imp->imp_target_uuid.uuid,
 437                        aa->pcaa_peer_committed,
 438                        request->rq_repmsg->last_committed);
 439         }
 440
 441 finish:
 442         rc = ptlrpc_import_recovery_state_machine(imp);
 443         if (rc != 0) {
 444                 if (rc == -ENOTCONN) {
 445                         CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
 446                                "invalidating and reconnecting\n",
 447                                imp->imp_target_uuid.uuid,
 448                                imp->imp_connection->c_remote_uuid.uuid);
 449                         ptlrpc_connect_import(imp, NULL);
 450                         RETURN(0);
 451                 }
 452         }
 453  out:
 454         if (rc != 0) {
 455                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 456                 if (aa->pcaa_initial_connect && !imp->imp_initial_recov) {
 457                         ptlrpc_deactivate_import(imp);
 458                 }
 459                 if (rc == -ETIMEDOUT && (jiffies - imp->imp_connect_start) > HZ) {
 460                         CDEBUG(D_ERROR, "recovery of %s on %s failed (timeout)\n",
 461                                imp->imp_target_uuid.uuid,
 462                                (char *)imp->imp_connection->c_remote_uuid.uuid);
 463                         ptlrpc_connect_import(imp, NULL);
 464                         RETURN(0);
 465                 }
 466                 CDEBUG(D_ERROR, "recovery of %s on %s failed (%d)\n",
 467                        imp->imp_target_uuid.uuid,
 468                        (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
 469         }
 470
 471         wake_up(&imp->imp_recovery_waitq);
 472         RETURN(rc);
 473 }
 474
 475 static int completed_replay_interpret(struct ptlrpc_request *req,
 476                                     void * data, int rc)
 477 {
 478         atomic_dec(&req->rq_import->imp_replay_inflight);
 479         ptlrpc_import_recovery_state_machine(req->rq_import);
 480         RETURN(0);
 481 }
 482
 483 static int signal_completed_replay(struct obd_import *imp)
 484  {
 485         struct ptlrpc_request *req;
 486         ENTRY;
 487
 488         LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
 489         atomic_inc(&imp->imp_replay_inflight);
 490
 491         req = ptlrpc_prep_req(imp, OBD_PING, 0, NULL, NULL);
 492         if (!req)
 493                 RETURN(-ENOMEM);
 494
 495         req->rq_replen = lustre_msg_size(0, NULL);
 496         req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
 497         req->rq_reqmsg->flags |= MSG_LAST_REPLAY;
 498         req->rq_timeout *= 3;
 499         req->rq_interpret_reply = completed_replay_interpret;
 500
 501         ptlrpcd_add_req(req);
 502         RETURN(0);
 503 }
 504
 505 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
 506 {
 507         int rc = 0;
 508         int inflight;
 509
 510         if (imp->imp_state == LUSTRE_IMP_EVICTED) {
 511                 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
 512                        imp->imp_target_uuid.uuid,
 513                        imp->imp_connection->c_remote_uuid.uuid);
 514
 515                 ptlrpc_invalidate_import(imp, 1);
 516
 517                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 518         }
 519
 520         if (imp->imp_state == LUSTRE_IMP_REPLAY) {
 521                 CDEBUG(D_HA, "replay requested by %s\n",
 522                        imp->imp_target_uuid.uuid);
 523                 rc = ptlrpc_replay_next(imp, &inflight);
 524                 if (inflight == 0 &&
 525                     atomic_read(&imp->imp_replay_inflight) == 0) {
 526                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
 527                         rc = ldlm_replay_locks(imp);
 528                         if (rc)
 529                                 GOTO(out, rc);
 530                 }
 531                 rc = 0;
 532         }
 533
 534         if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
 535                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
 536                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
 537                         rc = signal_completed_replay(imp);
 538                         if (rc)
 539                                 GOTO(out, rc);
 540                 }
 541
 542         }
 543
 544         if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
 545                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
 546                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 547                 }
 548         }
 549
 550         if (imp->imp_state == LUSTRE_IMP_RECOVER) {
 551                 CDEBUG(D_HA, "reconnected to %s@%s\n",
 552                        imp->imp_target_uuid.uuid,
 553                        imp->imp_connection->c_remote_uuid.uuid);
 554
 555                 rc = ptlrpc_resend(imp);
 556                 if (rc)
 557                         GOTO(out, rc);
 558                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 559                 ptlrpc_activate_import(imp);
 560         }
 561
 562         if (imp->imp_state == LUSTRE_IMP_FULL) {
 563                 wake_up(&imp->imp_recovery_waitq);
 564                 ptlrpc_wake_delayed(imp);
 565         }
 566
 567  out:
 568         RETURN(rc);
 569 }
 570
 571 static int back_to_sleep(void *unused)
 572 {
 573         return 0;
 574 }
 575
 576 int ptlrpc_disconnect_import(struct obd_import *imp)
 577 {
 578         struct ptlrpc_request *request;
 579         int rq_opc;
 580         int rc = 0;
 581         unsigned long flags;
 582         ENTRY;
 583
 584         switch (imp->imp_connect_op) {
 585         case OST_CONNECT: rq_opc = OST_DISCONNECT; break;
 586         case MDS_CONNECT: rq_opc = MDS_DISCONNECT; break;
 587         case MGMT_CONNECT:rq_opc = MGMT_DISCONNECT;break;
 588         default:
 589                 CERROR("don't know how to disconnect from %s (connect_op %d)\n",
 590                        imp->imp_target_uuid.uuid, imp->imp_connect_op);
 591                 RETURN(-EINVAL);
 592         }
 593
 594
 595         if (ptlrpc_import_in_recovery(imp)) {
 596                 struct l_wait_info lwi;
 597                 unsigned long timeout;
 598                 if (imp->imp_server_timeout)
 599                         timeout = obd_timeout / 2;
 600                 else
 601                         timeout = obd_timeout;
 602                 timeout = MAX(timeout * HZ, 1);
 603                 lwi = LWI_TIMEOUT_INTR(obd_timeout, back_to_sleep, NULL, NULL);
 604                 rc = l_wait_event(imp->imp_recovery_waitq,
 605                                   !ptlrpc_import_in_recovery(imp), &lwi);
 606
 607         }
 608
 609         spin_lock_irqsave(&imp->imp_lock, flags);
 610         if (imp->imp_state != LUSTRE_IMP_FULL) {
 611                 GOTO(out, 0);
 612         }
 613         spin_unlock_irqrestore(&imp->imp_lock, flags);
 614
 615         request = ptlrpc_prep_req(imp, rq_opc, 0, NULL, NULL);
 616         if (request) {
 617                 /* For non-replayable connections, don't attempt
 618                    reconnect if this fails */
 619                 if (!imp->imp_replayable) {
 620                         request->rq_no_resend = 1;
 621                         IMPORT_SET_STATE(imp, LUSTRE_IMP_CONNECTING);
 622                         request->rq_send_state =  LUSTRE_IMP_CONNECTING;
 623                 }
 624                 request->rq_replen = lustre_msg_size(0, NULL);
 625                 rc = ptlrpc_queue_wait(request);
 626                 ptlrpc_req_finished(request);
 627         }
 628
 629         spin_lock_irqsave(&imp->imp_lock, flags);
 630 out:
 631         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
 632         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
 633         imp->imp_conn_cnt = 0;
 634         spin_unlock_irqrestore(&imp->imp_lock, flags);
 635
 636         RETURN(rc);
 637 }
 638