lustre/ptlrpc/recover.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  *
  31  * lustre/ptlrpc/recover.c
  32  *
  33  * Author: Mike Shaver <shaver@clusterfs.com>
  34  */
  35
  36 #define DEBUG_SUBSYSTEM S_RPC
  37 #include <linux/list.h>
  38 #include <libcfs/libcfs.h>
  39 #include <obd_support.h>
  40 #include <lustre_ha.h>
  41 #include <lustre_net.h>
  42 #include <lustre_import.h>
  43 #include <lustre_export.h>
  44 #include <obd.h>
  45 #include <obd_class.h>
  46
  47 #include "ptlrpc_internal.h"
  48
  49 /**
  50  * Identify what request from replay list needs to be replayed next
  51  * (based on what we have already replayed) and send it to server.
  52  */
  53 int ptlrpc_replay_next(struct obd_import *imp, int *inflight)
  54 {
  55         int rc = 0;
  56         struct ptlrpc_request *req = NULL;
  57         __u64 last_transno;
  58         ENTRY;
  59
  60         *inflight = 0;
  61
  62         /* It might have committed some after we last spoke, so make sure we
  63          * get rid of them now.
  64          */
  65         spin_lock(&imp->imp_lock);
  66         imp->imp_last_transno_checked = 0;
  67         ptlrpc_free_committed(imp);
  68         last_transno = imp->imp_last_replay_transno;
  69
  70         CDEBUG(D_HA, "import %p from %s committed %llu last %llu\n",
  71                imp, obd2cli_tgt(imp->imp_obd),
  72                imp->imp_peer_committed_transno, last_transno);
  73
  74         /* Replay all the committed open requests on committed_list first */
  75         if (!list_empty(&imp->imp_committed_list)) {
  76                 req = list_last_entry(&imp->imp_committed_list,
  77                                       struct ptlrpc_request, rq_replay_list);
  78
  79                 /* The last request on committed_list hasn't been replayed */
  80                 if (req->rq_transno > last_transno) {
  81                         if (!imp->imp_resend_replay ||
  82                             imp->imp_replay_cursor == &imp->imp_committed_list)
  83                                 imp->imp_replay_cursor =
  84                                         imp->imp_replay_cursor->next;
  85
  86                         while (imp->imp_replay_cursor !=
  87                                &imp->imp_committed_list) {
  88                                 req = list_entry(imp->imp_replay_cursor,
  89                                                  struct ptlrpc_request,
  90                                                  rq_replay_list);
  91                                 if (req->rq_transno > last_transno)
  92                                         break;
  93
  94                                 req = NULL;
  95                                 LASSERT(!list_empty(imp->imp_replay_cursor));
  96                                 imp->imp_replay_cursor =
  97                                         imp->imp_replay_cursor->next;
  98                         }
  99                 } else {
 100                         /* All requests on committed_list have been replayed */
 101                         imp->imp_replay_cursor = &imp->imp_committed_list;
 102                         req = NULL;
 103                 }
 104         }
 105
 106         /* All the requests in committed list have been replayed, let's replay
 107          * the imp_replay_list */
 108         if (req == NULL) {
 109                 struct ptlrpc_request *tmp;
 110
 111                 list_for_each_entry(tmp, &imp->imp_replay_list,
 112                                     rq_replay_list) {
 113                         if (tmp->rq_transno > last_transno) {
 114                                 req = tmp;
 115                                 break;
 116                         }
 117                 }
 118         }
 119
 120         /* If need to resend the last sent transno (because a reconnect
 121          * has occurred), then stop on the matching req and send it again.
 122          * If, however, the last sent transno has been committed then we
 123          * continue replay from the next request. */
 124         if (req != NULL && imp->imp_resend_replay)
 125                 lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
 126
 127         /* ptlrpc_prepare_replay() may fail to add the reqeust into unreplied
 128          * list if the request hasn't been added to replay list then. Another
 129          * exception is that resend replay could have been removed from the
 130          * unreplied list. */
 131         if (req != NULL && list_empty(&req->rq_unreplied_list)) {
 132                 DEBUG_REQ(D_HA, req, "resend_replay=%d, last_transno=%llu",
 133                           imp->imp_resend_replay, last_transno);
 134                 ptlrpc_add_unreplied(req);
 135                 imp->imp_known_replied_xid = ptlrpc_known_replied_xid(imp);
 136         }
 137
 138         imp->imp_resend_replay = 0;
 139         spin_unlock(&imp->imp_lock);
 140
 141         if (req != NULL) {
 142                 LASSERT(!list_empty(&req->rq_unreplied_list));
 143
 144                 rc = ptlrpc_replay_req(req);
 145                 if (rc) {
 146                         CERROR("recovery replay error %d for req %llu\n",
 147                                rc, req->rq_xid);
 148                         RETURN(rc);
 149                 }
 150                 *inflight = 1;
 151         }
 152         RETURN(rc);
 153 }
 154
 155 /**
 156  * Schedule resending of request on sending_list. This is done after
 157  * we completed replaying of requests and locks.
 158  */
 159 int ptlrpc_resend(struct obd_import *imp)
 160 {
 161         struct ptlrpc_request *req;
 162
 163         ENTRY;
 164
 165         /* As long as we're in recovery, nothing should be added to the sending
 166          * list, so we don't need to hold the lock during this iteration and
 167          * resend process.
 168          */
 169         /* Well... what if lctl recover is called twice at the same time?
 170          */
 171         spin_lock(&imp->imp_lock);
 172         if (imp->imp_state != LUSTRE_IMP_RECOVER) {
 173                 spin_unlock(&imp->imp_lock);
 174                 RETURN(-1);
 175         }
 176
 177         list_for_each_entry(req, &imp->imp_sending_list, rq_list) {
 178                 LASSERTF((long)req > PAGE_SIZE && req != LP_POISON,
 179                          "req %px bad\n", req);
 180                 LASSERTF(req->rq_type != LI_POISON, "req %px freed\n", req);
 181
 182                 /* If the request is allowed to be sent during replay and it
 183                  * is not timeout yet, then it does not need to be resent. */
 184                 if (!ptlrpc_no_resend(req) &&
 185                     (req->rq_timedout || !req->rq_allow_replay))
 186                         ptlrpc_resend_req(req);
 187         }
 188         spin_unlock(&imp->imp_lock);
 189
 190         CFS_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT, 2);
 191         RETURN(0);
 192 }
 193
 194 /**
 195  * Go through all requests in delayed list and wake their threads
 196  * for resending
 197  */
 198 void ptlrpc_wake_delayed(struct obd_import *imp)
 199 {
 200         struct ptlrpc_request *req;
 201
 202         spin_lock(&imp->imp_lock);
 203         list_for_each_entry(req, &imp->imp_delayed_list, rq_list) {
 204                 DEBUG_REQ(D_HA, req, "waking (set %p):", req->rq_set);
 205                 ptlrpc_client_wake_req(req);
 206         }
 207         spin_unlock(&imp->imp_lock);
 208 }
 209
 210 void ptlrpc_request_handle_notconn(struct ptlrpc_request *failed_req)
 211 {
 212         struct obd_import *imp = failed_req->rq_import;
 213         int conn = lustre_msg_get_conn_cnt(failed_req->rq_reqmsg);
 214         ENTRY;
 215
 216         CDEBUG(D_HA, "import %s of %s@%s abruptly disconnected: reconnecting\n",
 217                 imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
 218                 imp->imp_connection->c_remote_uuid.uuid);
 219
 220         if (ptlrpc_set_import_discon(imp, conn, true)) {
 221                 /* to control recovery via lctl {disable|enable}_recovery */
 222                 if (imp->imp_deactive == 0)
 223                         ptlrpc_connect_import(imp);
 224         }
 225
 226         /* Wait for recovery to complete and resend. If evicted, then
 227            this request will be errored out later.*/
 228         spin_lock(&failed_req->rq_lock);
 229         if (!failed_req->rq_no_resend)
 230                 failed_req->rq_resend = 1;
 231         spin_unlock(&failed_req->rq_lock);
 232
 233         EXIT;
 234 }
 235
 236 /**
 237  * Administratively active/deactive a client.
 238  * This should only be called by the ioctl interface, currently
 239  *  - the lctl deactivate and activate commands
 240  *  - echo 0/1 >> /proc/osc/XXX/active
 241  *  - client umount -f (ll_umount_begin)
 242  */
 243 int ptlrpc_set_import_active(struct obd_import *imp, int active)
 244 {
 245         struct obd_device *obd = imp->imp_obd;
 246         int rc = 0;
 247
 248         ENTRY;
 249         LASSERT(obd);
 250
 251         /* When deactivating, mark import invalid, and abort in-flight
 252          * requests. */
 253         if (!active) {
 254                 LCONSOLE_WARN("setting import %s INACTIVE by administrator "
 255                               "request\n", obd2cli_tgt(imp->imp_obd));
 256
 257                 /* set before invalidate to avoid messages about imp_inval
 258                  * set without imp_deactive in ptlrpc_import_delay_req */
 259                 spin_lock(&imp->imp_lock);
 260                 imp->imp_deactive = 1;
 261                 spin_unlock(&imp->imp_lock);
 262
 263                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DEACTIVATE);
 264
 265                 ptlrpc_invalidate_import(imp);
 266         }
 267
 268         /* When activating, mark import valid, and attempt recovery */
 269         if (active) {
 270                 CDEBUG(D_HA, "setting import %s VALID\n",
 271                        obd2cli_tgt(imp->imp_obd));
 272
 273                 spin_lock(&imp->imp_lock);
 274                 imp->imp_deactive = 0;
 275                 spin_unlock(&imp->imp_lock);
 276                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_ACTIVATE);
 277
 278                 rc = ptlrpc_recover_import(imp, NULL, 0);
 279         }
 280
 281         RETURN(rc);
 282 }
 283 EXPORT_SYMBOL(ptlrpc_set_import_active);
 284
 285 bool ptlrpc_import_in_recovery_disconnect(struct obd_import *imp,
 286                                           bool disconnect_is_recovery)
 287 {
 288         bool in_recovery = true;
 289
 290         spin_lock(&imp->imp_lock);
 291         if (imp->imp_state < LUSTRE_IMP_DISCON ||
 292             (!disconnect_is_recovery && imp->imp_state == LUSTRE_IMP_DISCON) ||
 293             imp->imp_state >= LUSTRE_IMP_FULL ||
 294             imp->imp_obd->obd_no_recov)
 295                 in_recovery = false;
 296         spin_unlock(&imp->imp_lock);
 297
 298         return in_recovery;
 299 }
 300
 301
 302 /* Attempt to reconnect an import */
 303 int ptlrpc_recover_import(struct obd_import *imp, char *new_uuid, int async)
 304 {
 305         int rc = 0;
 306         ENTRY;
 307
 308         spin_lock(&imp->imp_lock);
 309         if (imp->imp_state == LUSTRE_IMP_NEW || imp->imp_deactive ||
 310             atomic_read(&imp->imp_inval_count))
 311                 rc = -EINVAL;
 312         spin_unlock(&imp->imp_lock);
 313         if (rc)
 314                 GOTO(out, rc);
 315
 316         /* force import to be disconnected. */
 317         ptlrpc_set_import_discon(imp, 0, false);
 318
 319         if (new_uuid) {
 320                 struct obd_uuid uuid;
 321
 322                 /* intruct import to use new uuid */
 323                 obd_str2uuid(&uuid, new_uuid);
 324                 rc = import_set_conn_priority(imp, &uuid);
 325                 if (rc)
 326                         GOTO(out, rc);
 327         }
 328
 329         /* Check if reconnect is already in progress */
 330         spin_lock(&imp->imp_lock);
 331         if (imp->imp_state != LUSTRE_IMP_DISCON) {
 332                 imp->imp_force_verify = 1;
 333                 rc = -EALREADY;
 334         }
 335         spin_unlock(&imp->imp_lock);
 336
 337         if (!rc) {
 338                 CFS_RACE(OBD_FAIL_PTLRPC_CONNECT_RACE);
 339                 rc = ptlrpc_connect_import(imp);
 340         }
 341
 342         if (!async && (rc == -EALREADY || rc == 0)) {
 343                 long timeout = cfs_time_seconds(obd_timeout);
 344
 345                 CDEBUG(D_HA, "%s: recovery started, waiting %u seconds\n",
 346                        obd2cli_tgt(imp->imp_obd), obd_timeout);
 347
 348                 rc = wait_event_idle_timeout(imp->imp_recovery_waitq,
 349                         !ptlrpc_import_in_recovery_disconnect(imp, true),
 350                         timeout);
 351                 if (rc == 0)
 352                         rc = -ETIMEDOUT;
 353                 else
 354                         rc = 0;
 355                 CDEBUG(D_HA, "%s: recovery finished %s, rc = %d\n",
 356                        obd2cli_tgt(imp->imp_obd),
 357                        ptlrpc_import_state_name(imp->imp_state), rc);
 358         }
 359         EXIT;
 360
 361 out:
 362         return rc;
 363 }
 364 EXPORT_SYMBOL(ptlrpc_recover_import);
 365
 366 bool ptlrpc_import_in_recovery(struct obd_import *imp)
 367 {
 368         return ptlrpc_import_in_recovery_disconnect(imp, false);
 369 }