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         int pcaa_was_invalid;
  46 };
  47
  48 /* A CLOSED import should remain so. */
  49 #define IMPORT_SET_STATE_NOLOCK(imp, state)                                    \
  50 do {                                                                           \
  51         if (imp->imp_state != LUSTRE_IMP_CLOSED) {                             \
  52                CDEBUG(D_HA, "%p %s: changing import state from %s to %s\n",    \
  53                       imp, imp->imp_target_uuid.uuid,                          \
  54                       ptlrpc_import_state_name(imp->imp_state),                \
  55                       ptlrpc_import_state_name(state));                        \
  56                imp->imp_state = state;                                         \
  57         }                                                                      \
  58 } while(0)
  59
  60 #define IMPORT_SET_STATE(imp, state)                    \
  61 do {                                                    \
  62         unsigned long flags;                            \
  63                                                         \
  64         spin_lock_irqsave(&imp->imp_lock, flags);       \
  65         IMPORT_SET_STATE_NOLOCK(imp, state);            \
  66         spin_unlock_irqrestore(&imp->imp_lock, flags);  \
  67 } while(0)
  68
  69
  70 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
  71                                     void * data, int rc);
  72 int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
  73
  74 /* Only this function is allowed to change the import state when it is
  75  * CLOSED. I would rather refcount the import and free it after
  76  * disconnection like we do with exports. To do that, the client_obd
  77  * will need to save the peer info somewhere other than in the import,
  78  * though. */
  79 int ptlrpc_init_import(struct obd_import *imp)
  80 {
  81         unsigned long flags;
  82
  83         spin_lock_irqsave(&imp->imp_lock, flags);
  84
  85         imp->imp_generation++;
  86         imp->imp_state =  LUSTRE_IMP_NEW;
  87
  88         spin_unlock_irqrestore(&imp->imp_lock, flags);
  89
  90         return 0;
  91 }
  92
  93 /* Returns true if import was FULL, false if import was already not
  94  * connected.
  95  */
  96 int ptlrpc_set_import_discon(struct obd_import *imp)
  97 {
  98         unsigned long flags;
  99         int rc = 0;
 100
 101         spin_lock_irqsave(&imp->imp_lock, flags);
 102
 103         if (imp->imp_state == LUSTRE_IMP_FULL) {
 104                 IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_DISCON);
 105                 rc = 1;
 106         } else {
 107                 CDEBUG(D_HA, "%p %s: import already not connected: %s\n",
 108                        imp,imp->imp_client->cli_name,
 109                        ptlrpc_import_state_name(imp->imp_state));
 110         }
 111         spin_unlock_irqrestore(&imp->imp_lock, flags);
 112
 113         return rc;
 114 }
 115
 116 void ptlrpc_fail_import(struct obd_import *imp, int generation)
 117 {
 118         ENTRY;
 119
 120         LASSERT (!imp->imp_dlm_fake);
 121
 122         if (ptlrpc_set_import_discon(imp))
 123                 ptlrpc_handle_failed_import(imp);
 124
 125         EXIT;
 126 }
 127
 128 int ptlrpc_connect_import(struct obd_import *imp, char * new_uuid)
 129 {
 130         struct obd_device *obd = imp->imp_obd;
 131         int initial_connect = 0;
 132         int rc;
 133         __u64 committed_before_reconnect = 0;
 134         int was_invalid = 0;
 135         struct ptlrpc_request *request;
 136         int size[] = {sizeof(imp->imp_target_uuid),
 137                                  sizeof(obd->obd_uuid),
 138                                  sizeof(imp->imp_dlm_handle)};
 139         char *tmp[] = {imp->imp_target_uuid.uuid,
 140                        obd->obd_uuid.uuid,
 141                        (char *)&imp->imp_dlm_handle};
 142         struct ptlrpc_connect_async_args *aa;
 143         unsigned long flags;
 144
 145         spin_lock_irqsave(&imp->imp_lock, flags);
 146         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 147                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 148                 CERROR("can't connect to a closed import\n");
 149                 RETURN(-EINVAL);
 150         } else if (imp->imp_state == LUSTRE_IMP_FULL) {
 151                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 152                 CERROR("already connected\n");
 153                 RETURN(0);
 154         } else if (imp->imp_state == LUSTRE_IMP_CONNECTING) {
 155                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 156                 CERROR("already connecting\n");
 157                 RETURN(-EALREADY);
 158         }
 159
 160         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CONNECTING);
 161
 162         imp->imp_conn_cnt++;
 163         imp->imp_last_replay_transno = 0;
 164
 165         if (imp->imp_remote_handle.cookie == 0) {
 166                 initial_connect = 1;
 167         } else {
 168                 committed_before_reconnect = imp->imp_peer_committed_transno;;
 169
 170         }
 171
 172         if (imp->imp_invalid) {
 173                 imp->imp_invalid = 0;
 174                 was_invalid = 1;
 175         }
 176
 177         spin_unlock_irqrestore(&imp->imp_lock, flags);
 178
 179         if (new_uuid) {
 180                 struct ptlrpc_connection *conn;
 181                 struct obd_uuid uuid;
 182                 struct obd_export *dlmexp;
 183
 184                 obd_str2uuid(&uuid, new_uuid);
 185
 186                 conn = ptlrpc_uuid_to_connection(&uuid);
 187                 if (!conn)
 188                         GOTO(out, rc = -ENOENT);
 189
 190                 CDEBUG(D_HA, "switching import %s/%s from %s to %s\n",
 191                        imp->imp_target_uuid.uuid, imp->imp_obd->obd_name,
 192                        imp->imp_connection->c_remote_uuid.uuid,
 193                        conn->c_remote_uuid.uuid);
 194
 195                 /* Switch the import's connection and the DLM export's
 196                  * connection (which are almost certainly the same, but we
 197                  * keep distinct refs just to make things clearer. I think. */
 198                 if (imp->imp_connection)
 199                         ptlrpc_put_connection(imp->imp_connection);
 200                 /* We hand off the ref from ptlrpc_get_connection. */
 201                 imp->imp_connection = conn;
 202
 203                 dlmexp = class_conn2export(&imp->imp_dlm_handle);
 204
 205                 LASSERT(dlmexp != NULL);
 206
 207                 if (dlmexp->exp_connection)
 208                         ptlrpc_put_connection(dlmexp->exp_connection);
 209                 dlmexp->exp_connection = ptlrpc_connection_addref(conn);
 210                 class_export_put(dlmexp);
 211
 212         }
 213
 214         request = ptlrpc_prep_req(imp, imp->imp_connect_op, 3, size, tmp);
 215         if (!request)
 216                 GOTO(out, rc = -ENOMEM);
 217
 218 #ifndef __KERNEL__
 219         lustre_msg_add_op_flags(request->rq_reqmsg, MSG_CONNECT_LIBCLIENT);
 220 #endif
 221
 222         request->rq_send_state = LUSTRE_IMP_CONNECTING;
 223         request->rq_replen = lustre_msg_size(0, NULL);
 224         request->rq_interpret_reply = ptlrpc_connect_interpret;
 225
 226         LASSERT (sizeof (*aa) <= sizeof (request->rq_async_args));
 227         aa = (struct ptlrpc_connect_async_args *)&request->rq_async_args;
 228         memset(aa, 0, sizeof *aa);
 229
 230         aa->pcaa_peer_committed = committed_before_reconnect;
 231         aa->pcaa_initial_connect = initial_connect;
 232         aa->pcaa_was_invalid = was_invalid;
 233
 234         if (aa->pcaa_initial_connect)
 235                 imp->imp_replayable = 1;
 236
 237         ptlrpcd_add_req(request);
 238         rc = 0;
 239 out:
 240         if (rc != 0) {
 241                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 242         }
 243
 244         RETURN(rc);
 245 }
 246
 247 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
 248                                     void * data, int rc)
 249 {
 250         struct ptlrpc_connect_async_args *aa = data;
 251         struct obd_import *imp = request->rq_import;
 252         struct lustre_handle old_hdl;
 253         unsigned long flags;
 254         int msg_flags;
 255         ENTRY;
 256
 257         spin_lock_irqsave(&imp->imp_lock, flags);
 258         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 259                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 260                 RETURN(0);
 261         }
 262         spin_unlock_irqrestore(&imp->imp_lock, flags);
 263
 264         if (rc)
 265                 GOTO(out, rc);
 266
 267         msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
 268
 269         if (aa->pcaa_initial_connect) {
 270                 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
 271                         CDEBUG(D_HA, "connected to replayable target: %s\n",
 272                                imp->imp_target_uuid.uuid);
 273                         imp->imp_replayable = 1;
 274                         ptlrpc_pinger_add_import(imp);
 275                 } else {
 276                         imp->imp_replayable = 0;
 277                 }
 278                 imp->imp_remote_handle = request->rq_repmsg->handle;
 279                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 280                 GOTO(finish, rc = 0);
 281         }
 282
 283         /* Determine what recovery state to move the import to. */
 284         if (MSG_CONNECT_RECONNECT & msg_flags) {
 285                 memset(&old_hdl, 0, sizeof(old_hdl));
 286                 if (!memcmp(&old_hdl, &request->rq_repmsg->handle,
 287                             sizeof (old_hdl))) {
 288                         CERROR("%s@%s didn't like our handle "LPX64
 289                                ", failed\n", imp->imp_target_uuid.uuid,
 290                                imp->imp_connection->c_remote_uuid.uuid,
 291                                imp->imp_dlm_handle.cookie);
 292                         GOTO(out, rc = -ENOTCONN);
 293                 }
 294
 295                 if (memcmp(&imp->imp_remote_handle, &request->rq_repmsg->handle,
 296                            sizeof(imp->imp_remote_handle))) {
 297                         CERROR("%s@%s changed handle from "LPX64" to "LPX64
 298                                "; copying, but this may foreshadow disaster\n",
 299                                imp->imp_target_uuid.uuid,
 300                                imp->imp_connection->c_remote_uuid.uuid,
 301                                imp->imp_remote_handle.cookie,
 302                                request->rq_repmsg->handle.cookie);
 303                         imp->imp_remote_handle = request->rq_repmsg->handle;
 304                 } else {
 305                         CERROR("reconnected to %s@%s after partition\n",
 306                                imp->imp_target_uuid.uuid,
 307                                imp->imp_connection->c_remote_uuid.uuid);
 308                 }
 309                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 310         }
 311         else if (MSG_CONNECT_RECOVERING & msg_flags) {
 312                 LASSERT(imp->imp_replayable);
 313                 imp->imp_state = LUSTRE_IMP_RECOVER;
 314                 imp->imp_remote_handle = request->rq_repmsg->handle;
 315                 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 316         }
 317         else {
 318                 imp->imp_remote_handle = request->rq_repmsg->handle;
 319                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 320         }
 321
 322         /* Sanity checks for a reconnected import. */
 323         if (!(imp->imp_replayable) !=
 324              !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
 325                 CERROR("imp_replayable flag does not match server "
 326                        "after reconnect. We should LBUG right here.\n");
 327         }
 328
 329         if (request->rq_repmsg->last_committed < aa->pcaa_peer_committed) {
 330                 CERROR("%s went back in time (transno "LPD64
 331                        " was previously committed, server now claims "LPD64
 332                        ")! is shared storage not coherent?\n",
 333                        imp->imp_target_uuid.uuid,
 334                        aa->pcaa_peer_committed,
 335                        request->rq_repmsg->last_committed);
 336         }
 337
 338 finish:
 339         rc = ptlrpc_import_recovery_state_machine(imp);
 340         if (rc != 0) {
 341                 if (aa->pcaa_was_invalid) {
 342                         ptlrpc_set_import_active(imp, 0);
 343                 }
 344
 345                 if (rc == -ENOTCONN) {
 346                         CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
 347                                "invalidating and reconnecting\n",
 348                                imp->imp_target_uuid.uuid,
 349                                imp->imp_connection->c_remote_uuid.uuid);
 350                         ptlrpc_connect_import(imp, NULL);
 351                         RETURN(0);
 352                 }
 353         }
 354  out:
 355         if (rc != 0) {
 356                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 357                 if (aa->pcaa_initial_connect && !imp->imp_initial_recov) {
 358                         ptlrpc_set_import_active(imp, 0);
 359                         GOTO(norecov, rc);
 360                 }
 361                 CDEBUG(D_ERROR,
 362                        "recovery of %s on %s failed (%d); restarting\n",
 363                        imp->imp_target_uuid.uuid,
 364                        (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
 365                 ptlrpc_handle_failed_import(imp);
 366         }
 367
 368 norecov:
 369         wake_up(&imp->imp_recovery_waitq);
 370         RETURN(rc);
 371 }
 372
 373 static int completed_replay_interpret(struct ptlrpc_request *req,
 374                                     void * data, int rc)
 375 {
 376         atomic_dec(&req->rq_import->imp_replay_inflight);
 377         ptlrpc_import_recovery_state_machine(req->rq_import);
 378         RETURN(0);
 379 }
 380
 381 static int signal_completed_replay(struct obd_import *imp)
 382  {
 383         struct ptlrpc_request *req;
 384         ENTRY;
 385
 386         LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
 387         atomic_inc(&imp->imp_replay_inflight);
 388
 389         req = ptlrpc_prep_req(imp, OBD_PING, 0, NULL, NULL);
 390         if (!req)
 391                 RETURN(-ENOMEM);
 392
 393         req->rq_replen = lustre_msg_size(0, NULL);
 394         req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
 395         req->rq_reqmsg->flags |= MSG_LAST_REPLAY;
 396         req->rq_timeout *= 3;
 397         req->rq_interpret_reply = completed_replay_interpret;
 398
 399         ptlrpcd_add_req(req);
 400         RETURN(0);
 401 }
 402
 403
 404 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
 405 {
 406         int rc = 0;
 407
 408         if (imp->imp_state == LUSTRE_IMP_EVICTED) {
 409                 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
 410                        imp->imp_target_uuid.uuid,
 411                        imp->imp_connection->c_remote_uuid.uuid);
 412                 ptlrpc_set_import_active(imp, 0);
 413                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 414         }
 415
 416         if (imp->imp_state == LUSTRE_IMP_REPLAY) {
 417                 CDEBUG(D_HA, "replay requested by %s\n",
 418                        imp->imp_target_uuid.uuid);
 419                 rc = ptlrpc_replay_next(imp);
 420                 if (rc == 0 && atomic_read(&imp->imp_replay_inflight) == 0) {
 421                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
 422                         rc = ldlm_replay_locks(imp);
 423                         if (rc)
 424                                 GOTO(out, rc);
 425                 }
 426                 rc = 0;
 427         }
 428
 429         if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
 430                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
 431                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
 432                         rc = signal_completed_replay(imp);
 433                         if (rc)
 434                                 GOTO(out, rc);
 435                 }
 436
 437         }
 438
 439         if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
 440                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
 441                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 442                 }
 443         }
 444
 445         if (imp->imp_state == LUSTRE_IMP_RECOVER) {
 446                 CDEBUG(D_HA, "reconnected to %s@%s\n",
 447                        imp->imp_target_uuid.uuid,
 448                        imp->imp_connection->c_remote_uuid.uuid);
 449
 450                 ptlrpc_set_import_active(imp, 1);
 451                 rc = ptlrpc_resend(imp);
 452                 if (rc)
 453                         GOTO(out, rc);
 454                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 455         }
 456
 457         if (imp->imp_state == LUSTRE_IMP_FULL) {
 458                 wake_up(&imp->imp_recovery_waitq);
 459                 ptlrpc_wake_delayed(imp);
 460         }
 461
 462  out:
 463         RETURN(rc);
 464 }
 465
 466 static int back_to_sleep(void *unused)
 467 {
 468         return 0;
 469 }
 470
 471 int ptlrpc_disconnect_import(struct obd_import *imp)
 472 {
 473         struct ptlrpc_request *request;
 474         int rq_opc;
 475         int rc = 0;
 476         unsigned long flags;
 477         ENTRY;
 478
 479         switch (imp->imp_connect_op) {
 480         case OST_CONNECT: rq_opc = OST_DISCONNECT; break;
 481         case MDS_CONNECT: rq_opc = MDS_DISCONNECT; break;
 482         case MGMT_CONNECT:rq_opc = MGMT_DISCONNECT;break;
 483         default:
 484                 CERROR("don't know how to disconnect from %s (connect_op %d)\n",
 485                        imp->imp_target_uuid.uuid, imp->imp_connect_op);
 486                 RETURN(-EINVAL);
 487         }
 488
 489
 490         if (ptlrpc_import_in_recovery(imp)) {
 491                 struct l_wait_info lwi;
 492                 lwi = LWI_TIMEOUT_INTR(MAX(obd_timeout * HZ, 1), back_to_sleep,
 493                                        NULL, NULL);
 494                 rc = l_wait_event(imp->imp_recovery_waitq,
 495                                   !ptlrpc_import_in_recovery(imp), &lwi);
 496
 497         }
 498
 499         spin_lock_irqsave(&imp->imp_lock, flags);
 500         if (imp->imp_state != LUSTRE_IMP_FULL) {
 501                 GOTO(out, 0);
 502         }
 503         spin_unlock_irqrestore(&imp->imp_lock, flags);
 504
 505         request = ptlrpc_prep_req(imp, rq_opc, 0, NULL, NULL);
 506         if (request) {
 507                 /* For non-replayable connections, don't attempt
 508                    reconnect if this fails */
 509                 if (!imp->imp_replayable) {
 510                         IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 511                         request->rq_send_state =  LUSTRE_IMP_DISCON;
 512                 }
 513                 request->rq_replen = lustre_msg_size(0, NULL);
 514                 rc = ptlrpc_queue_wait(request);
 515                 ptlrpc_req_finished(request);
 516         }
 517
 518         spin_lock_irqsave(&imp->imp_lock, flags);
 519 out:
 520         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
 521         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
 522         spin_unlock_irqrestore(&imp->imp_lock, flags);
 523
 524         RETURN(rc);
 525 }
 526