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         request->rq_send_state = LUSTRE_IMP_CONNECTING;
 219         request->rq_replen = lustre_msg_size(0, NULL);
 220         request->rq_interpret_reply = ptlrpc_connect_interpret;
 221
 222         LASSERT (sizeof (*aa) <= sizeof (request->rq_async_args));
 223         aa = (struct ptlrpc_connect_async_args *)&request->rq_async_args;
 224         memset(aa, 0, sizeof *aa);
 225
 226         aa->pcaa_peer_committed = committed_before_reconnect;
 227         aa->pcaa_initial_connect = initial_connect;
 228         aa->pcaa_was_invalid = was_invalid;
 229
 230         if (aa->pcaa_initial_connect)
 231                 imp->imp_replayable = 1;
 232         ptlrpcd_add_req(request);
 233         rc = 0;
 234 out:
 235         if (rc != 0) {
 236                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 237         }
 238
 239         RETURN(rc);
 240 }
 241
 242 static int ptlrpc_connect_interpret(struct ptlrpc_request *request,
 243                                     void * data, int rc)
 244 {
 245         struct ptlrpc_connect_async_args *aa = data;
 246         struct obd_import *imp = request->rq_import;
 247         struct lustre_handle old_hdl;
 248         unsigned long flags;
 249         int msg_flags;
 250         ENTRY;
 251
 252         spin_lock_irqsave(&imp->imp_lock, flags);
 253         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 254                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 255                 RETURN(0);
 256         }
 257         spin_unlock_irqrestore(&imp->imp_lock, flags);
 258
 259         if (rc)
 260                 GOTO(out, rc);
 261
 262         msg_flags = lustre_msg_get_op_flags(request->rq_repmsg);
 263
 264         if (aa->pcaa_initial_connect) {
 265                 if (msg_flags & MSG_CONNECT_REPLAYABLE) {
 266                         CDEBUG(D_HA, "connected to replayable target: %s\n",
 267                                imp->imp_target_uuid.uuid);
 268                         imp->imp_replayable = 1;
 269                         ptlrpc_pinger_add_import(imp);
 270                 } else {
 271                         imp->imp_replayable = 0;
 272                 }
 273                 imp->imp_remote_handle = request->rq_repmsg->handle;
 274                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 275                 GOTO(finish, rc = 0);
 276         }
 277
 278         /* Determine what recovery state to move the import to. */
 279         if (MSG_CONNECT_RECONNECT & msg_flags) {
 280                 memset(&old_hdl, 0, sizeof(old_hdl));
 281                 if (!memcmp(&old_hdl, &request->rq_repmsg->handle,
 282                             sizeof (old_hdl))) {
 283                         CERROR("%s@%s didn't like our handle "LPX64
 284                                ", failed\n", imp->imp_target_uuid.uuid,
 285                                imp->imp_connection->c_remote_uuid.uuid,
 286                                imp->imp_dlm_handle.cookie);
 287                         GOTO(out, rc = -ENOTCONN);
 288                 }
 289
 290                 if (memcmp(&imp->imp_remote_handle, &request->rq_repmsg->handle,
 291                            sizeof(imp->imp_remote_handle))) {
 292                         CERROR("%s@%s changed handle from "LPX64" to "LPX64
 293                                "; copying, but this may foreshadow disaster\n",
 294                                imp->imp_target_uuid.uuid,
 295                                imp->imp_connection->c_remote_uuid.uuid,
 296                                imp->imp_remote_handle.cookie,
 297                                request->rq_repmsg->handle.cookie);
 298                         imp->imp_remote_handle = request->rq_repmsg->handle;
 299                 } else {
 300                         CERROR("reconnected to %s@%s after partition\n",
 301                                imp->imp_target_uuid.uuid,
 302                                imp->imp_connection->c_remote_uuid.uuid);
 303                 }
 304                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 305         }
 306         else if (MSG_CONNECT_RECOVERING & msg_flags) {
 307                 LASSERT(imp->imp_replayable);
 308                 imp->imp_state = LUSTRE_IMP_RECOVER;
 309                 imp->imp_remote_handle = request->rq_repmsg->handle;
 310                 IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY);
 311         }
 312         else {
 313                 imp->imp_remote_handle = request->rq_repmsg->handle;
 314                 IMPORT_SET_STATE(imp, LUSTRE_IMP_EVICTED);
 315         }
 316
 317         /* Sanity checks for a reconnected import. */
 318         if (!(imp->imp_replayable) !=
 319              !(msg_flags & MSG_CONNECT_REPLAYABLE)) {
 320                 CERROR("imp_replayable flag does not match server "
 321                        "after reconnect. We should LBUG right here.\n");
 322         }
 323
 324         if (request->rq_repmsg->last_committed < aa->pcaa_peer_committed) {
 325                 CERROR("%s went back in time (transno "LPD64
 326                        " was previously committed, server now claims "LPD64
 327                        ")! is shared storage not coherent?\n",
 328                        imp->imp_target_uuid.uuid,
 329                        aa->pcaa_peer_committed,
 330                        request->rq_repmsg->last_committed);
 331         }
 332
 333 finish:
 334         rc = ptlrpc_import_recovery_state_machine(imp);
 335         if (rc != 0) {
 336                 if (aa->pcaa_was_invalid) {
 337                         ptlrpc_set_import_active(imp, 0);
 338                 }
 339
 340                 if (rc == -ENOTCONN) {
 341                         CDEBUG(D_HA, "evicted/aborted by %s@%s during recovery;"
 342                                "invalidating and reconnecting\n",
 343                                imp->imp_target_uuid.uuid,
 344                                imp->imp_connection->c_remote_uuid.uuid);
 345                         ptlrpc_connect_import(imp, NULL);
 346                         RETURN(0);
 347                 }
 348         }
 349  out:
 350         if (rc != 0) {
 351                 IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 352                 if (aa->pcaa_initial_connect && !imp->imp_initial_recov)
 353                         GOTO(norecov, rc);
 354                 CDEBUG(D_ERROR,
 355                        "recovery of %s on %s failed (%d); restarting\n",
 356                        imp->imp_target_uuid.uuid,
 357                        (char *)imp->imp_connection->c_remote_uuid.uuid, rc);
 358                 ptlrpc_handle_failed_import(imp);
 359         }
 360
 361 norecov:
 362         wake_up(&imp->imp_recovery_waitq);
 363         RETURN(rc);
 364 }
 365
 366 static int completed_replay_interpret(struct ptlrpc_request *req,
 367                                     void * data, int rc)
 368 {
 369         atomic_dec(&req->rq_import->imp_replay_inflight);
 370         ptlrpc_import_recovery_state_machine(req->rq_import);
 371         RETURN(0);
 372 }
 373
 374 static int signal_completed_replay(struct obd_import *imp)
 375  {
 376         struct ptlrpc_request *req;
 377         ENTRY;
 378
 379         LASSERT(atomic_read(&imp->imp_replay_inflight) == 0);
 380         atomic_inc(&imp->imp_replay_inflight);
 381
 382         req = ptlrpc_prep_req(imp, OBD_PING, 0, NULL, NULL);
 383         if (!req)
 384                 RETURN(-ENOMEM);
 385
 386         req->rq_replen = lustre_msg_size(0, NULL);
 387         req->rq_send_state = LUSTRE_IMP_REPLAY_WAIT;
 388         req->rq_reqmsg->flags |= MSG_LAST_REPLAY;
 389         req->rq_timeout *= 3;
 390         req->rq_interpret_reply = completed_replay_interpret;
 391
 392         ptlrpcd_add_req(req);
 393         RETURN(0);
 394 }
 395
 396
 397 int ptlrpc_import_recovery_state_machine(struct obd_import *imp)
 398 {
 399         int rc = 0;
 400
 401         if (imp->imp_state == LUSTRE_IMP_EVICTED) {
 402                 CDEBUG(D_HA, "evicted from %s@%s; invalidating\n",
 403                        imp->imp_target_uuid.uuid,
 404                        imp->imp_connection->c_remote_uuid.uuid);
 405                 ptlrpc_set_import_active(imp, 0);
 406                 IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 407         }
 408
 409         if (imp->imp_state == LUSTRE_IMP_REPLAY) {
 410                 CDEBUG(D_HA, "replay requested by %s\n",
 411                        imp->imp_target_uuid.uuid);
 412                 rc = ptlrpc_replay_next(imp);
 413                 if (rc == 0 && atomic_read(&imp->imp_replay_inflight) == 0) {
 414                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_LOCKS);
 415                         rc = ldlm_replay_locks(imp);
 416                         if (rc)
 417                                 GOTO(out, rc);
 418                 }
 419                 rc = 0;
 420         }
 421
 422         if (imp->imp_state == LUSTRE_IMP_REPLAY_LOCKS) {
 423                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
 424                         IMPORT_SET_STATE(imp, LUSTRE_IMP_REPLAY_WAIT);
 425                         rc = signal_completed_replay(imp);
 426                         if (rc)
 427                                 GOTO(out, rc);
 428                 }
 429
 430         }
 431
 432         if (imp->imp_state == LUSTRE_IMP_REPLAY_WAIT) {
 433                 if (atomic_read(&imp->imp_replay_inflight) == 0) {
 434                         IMPORT_SET_STATE(imp, LUSTRE_IMP_RECOVER);
 435                 }
 436         }
 437
 438         if (imp->imp_state == LUSTRE_IMP_RECOVER) {
 439                 CDEBUG(D_HA, "reconnected to %s@%s\n",
 440                        imp->imp_target_uuid.uuid,
 441                        imp->imp_connection->c_remote_uuid.uuid);
 442
 443                 ptlrpc_set_import_active(imp, 1);
 444                 ptlrpc_resend(imp);
 445                 IMPORT_SET_STATE(imp, LUSTRE_IMP_FULL);
 446         }
 447
 448         if (imp->imp_state == LUSTRE_IMP_FULL) {
 449                 wake_up(&imp->imp_recovery_waitq);
 450                 ptlrpc_wake_delayed(imp);
 451         }
 452
 453  out:
 454         RETURN(rc);
 455 }
 456
 457 static int back_to_sleep(void *unused)
 458 {
 459         return 0;
 460 }
 461
 462 int ptlrpc_disconnect_import(struct obd_import *imp)
 463 {
 464         struct ptlrpc_request *request;
 465         int rq_opc;
 466         int rc = 0;
 467         unsigned long flags;
 468         ENTRY;
 469
 470         switch (imp->imp_connect_op) {
 471         case OST_CONNECT: rq_opc = OST_DISCONNECT; break;
 472         case MDS_CONNECT: rq_opc = MDS_DISCONNECT; break;
 473         case MGMT_CONNECT:rq_opc = MGMT_DISCONNECT;break;
 474         default:
 475                 CERROR("don't know how to disconnect from %s (connect_op %d)\n",
 476                        imp->imp_target_uuid.uuid, imp->imp_connect_op);
 477                 RETURN(-EINVAL);
 478         }
 479
 480
 481         if (ptlrpc_import_in_recovery(imp)) {
 482                 struct l_wait_info lwi;
 483                 lwi = LWI_TIMEOUT_INTR(MAX(obd_timeout * HZ, 1), back_to_sleep,
 484                                        NULL, NULL);
 485                 rc = l_wait_event(imp->imp_recovery_waitq,
 486                                   !ptlrpc_import_in_recovery(imp), &lwi);
 487
 488         }
 489
 490         spin_lock_irqsave(&imp->imp_lock, flags);
 491         if (imp->imp_state != LUSTRE_IMP_FULL) {
 492                 GOTO(out, 0);
 493         }
 494         spin_unlock_irqrestore(&imp->imp_lock, flags);
 495
 496         request = ptlrpc_prep_req(imp, rq_opc, 0, NULL, NULL);
 497         if (request) {
 498                 /* For non-replayable connections, don't attempt
 499                    reconnect if this fails */
 500                 if (!imp->imp_replayable) {
 501                         IMPORT_SET_STATE(imp, LUSTRE_IMP_DISCON);
 502                         request->rq_send_state =  LUSTRE_IMP_DISCON;
 503                 }
 504                 request->rq_replen = lustre_msg_size(0, NULL);
 505                 rc = ptlrpc_queue_wait(request);
 506                 ptlrpc_req_finished(request);
 507         }
 508
 509         spin_lock_irqsave(&imp->imp_lock, flags);
 510 out:
 511         IMPORT_SET_STATE_NOLOCK(imp, LUSTRE_IMP_CLOSED);
 512         memset(&imp->imp_remote_handle, 0, sizeof(imp->imp_remote_handle));
 513         spin_unlock_irqrestore(&imp->imp_lock, flags);
 514
 515         RETURN(rc);
 516 }
 517