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  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/ptlrpc/recover.c
  33  *
  34  * Author: Mike Shaver <shaver@clusterfs.com>
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_RPC
  38 #include <linux/list.h>
  39 #include <libcfs/libcfs.h>
  40 #include <obd_support.h>
  41 #include <lustre_ha.h>
  42 #include <lustre_net.h>
  43 #include <lustre_import.h>
  44 #include <lustre_export.h>
  45 #include <obd.h>
  46 #include <obd_class.h>
  47
  48 #include "ptlrpc_internal.h"
  49
  50 /**
  51  * Start recovery on disconnected import.
  52  * This is done by just attempting a connect
  53  */
  54 void ptlrpc_initiate_recovery(struct obd_import *imp)
  55 {
  56         ENTRY;
  57
  58         CDEBUG(D_HA, "%s: starting recovery\n", obd2cli_tgt(imp->imp_obd));
  59         ptlrpc_connect_import(imp);
  60
  61         EXIT;
  62 }
  63
  64 /**
  65  * Identify what request from replay list needs to be replayed next
  66  * (based on what we have already replayed) and send it to server.
  67  */
  68 int ptlrpc_replay_next(struct obd_import *imp, int *inflight)
  69 {
  70         int rc = 0;
  71         struct list_head *tmp, *pos;
  72         struct ptlrpc_request *req = NULL;
  73         __u64 last_transno;
  74         ENTRY;
  75
  76         *inflight = 0;
  77
  78         /* It might have committed some after we last spoke, so make sure we
  79          * get rid of them now.
  80          */
  81         spin_lock(&imp->imp_lock);
  82         imp->imp_last_transno_checked = 0;
  83         ptlrpc_free_committed(imp);
  84         last_transno = imp->imp_last_replay_transno;
  85
  86         CDEBUG(D_HA, "import %p from %s committed %llu last %llu\n",
  87                imp, obd2cli_tgt(imp->imp_obd),
  88                imp->imp_peer_committed_transno, last_transno);
  89
  90         /* Replay all the committed open requests on committed_list first */
  91         if (!list_empty(&imp->imp_committed_list)) {
  92                 tmp = imp->imp_committed_list.prev;
  93                 req = list_entry(tmp, struct ptlrpc_request,
  94                                      rq_replay_list);
  95
  96                 /* The last request on committed_list hasn't been replayed */
  97                 if (req->rq_transno > last_transno) {
  98                         if (!imp->imp_resend_replay ||
  99                             imp->imp_replay_cursor == &imp->imp_committed_list)
 100                                 imp->imp_replay_cursor =
 101                                         imp->imp_replay_cursor->next;
 102
 103                         while (imp->imp_replay_cursor !=
 104                                &imp->imp_committed_list) {
 105                                 req = list_entry(imp->imp_replay_cursor,
 106                                                      struct ptlrpc_request,
 107                                                      rq_replay_list);
 108                                 if (req->rq_transno > last_transno)
 109                                         break;
 110
 111                                 req = NULL;
 112                                 LASSERT(!list_empty(imp->imp_replay_cursor));
 113                                 imp->imp_replay_cursor =
 114                                         imp->imp_replay_cursor->next;
 115                         }
 116                 } else {
 117                         /* All requests on committed_list have been replayed */
 118                         imp->imp_replay_cursor = &imp->imp_committed_list;
 119                         req = NULL;
 120                 }
 121         }
 122
 123         /* All the requests in committed list have been replayed, let's replay
 124          * the imp_replay_list */
 125         if (req == NULL) {
 126                 list_for_each_safe(tmp, pos, &imp->imp_replay_list) {
 127                         req = list_entry(tmp, struct ptlrpc_request,
 128                                              rq_replay_list);
 129
 130                         if (req->rq_transno > last_transno)
 131                                 break;
 132                         req = NULL;
 133                 }
 134         }
 135
 136         /* If need to resend the last sent transno (because a reconnect
 137          * has occurred), then stop on the matching req and send it again.
 138          * If, however, the last sent transno has been committed then we
 139          * continue replay from the next request. */
 140         if (req != NULL && imp->imp_resend_replay)
 141                 lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
 142
 143         /* ptlrpc_prepare_replay() may fail to add the reqeust into unreplied
 144          * list if the request hasn't been added to replay list then. Another
 145          * exception is that resend replay could have been removed from the
 146          * unreplied list. */
 147         if (req != NULL && list_empty(&req->rq_unreplied_list)) {
 148                 DEBUG_REQ(D_HA, req, "resend_replay: %d, last_transno: %llu\n",
 149                           imp->imp_resend_replay, last_transno);
 150                 ptlrpc_add_unreplied(req);
 151                 imp->imp_known_replied_xid = ptlrpc_known_replied_xid(imp);
 152         }
 153
 154         imp->imp_resend_replay = 0;
 155         spin_unlock(&imp->imp_lock);
 156
 157         if (req != NULL) {
 158                 LASSERT(!list_empty(&req->rq_unreplied_list));
 159
 160                 rc = ptlrpc_replay_req(req);
 161                 if (rc) {
 162                         CERROR("recovery replay error %d for req "
 163                                "%llu\n", rc, req->rq_xid);
 164                         RETURN(rc);
 165                 }
 166                 *inflight = 1;
 167         }
 168         RETURN(rc);
 169 }
 170
 171 /**
 172  * Schedule resending of request on sending_list. This is done after
 173  * we completed replaying of requests and locks.
 174  */
 175 int ptlrpc_resend(struct obd_import *imp)
 176 {
 177         struct ptlrpc_request *req, *next;
 178
 179         ENTRY;
 180
 181         /* As long as we're in recovery, nothing should be added to the sending
 182          * list, so we don't need to hold the lock during this iteration and
 183          * resend process.
 184          */
 185         /* Well... what if lctl recover is called twice at the same time?
 186          */
 187         spin_lock(&imp->imp_lock);
 188         if (imp->imp_state != LUSTRE_IMP_RECOVER) {
 189                 spin_unlock(&imp->imp_lock);
 190                 RETURN(-1);
 191         }
 192
 193         list_for_each_entry_safe(req, next, &imp->imp_sending_list, rq_list) {
 194                 LASSERTF((long)req > PAGE_SIZE && req != LP_POISON,
 195                          "req %p bad\n", req);
 196                 LASSERTF(req->rq_type != LI_POISON, "req %p freed\n", req);
 197
 198                 /* If the request is allowed to be sent during replay and it
 199                  * is not timeout yet, then it does not need to be resent. */
 200                 if (!ptlrpc_no_resend(req) &&
 201                     (req->rq_timedout || !req->rq_allow_replay))
 202                         ptlrpc_resend_req(req);
 203         }
 204         spin_unlock(&imp->imp_lock);
 205
 206         OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT, 2);
 207         RETURN(0);
 208 }
 209
 210 /**
 211  * Go through all requests in delayed list and wake their threads
 212  * for resending
 213  */
 214 void ptlrpc_wake_delayed(struct obd_import *imp)
 215 {
 216         struct list_head *tmp, *pos;
 217         struct ptlrpc_request *req;
 218
 219         spin_lock(&imp->imp_lock);
 220         list_for_each_safe(tmp, pos, &imp->imp_delayed_list) {
 221                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 222
 223                 DEBUG_REQ(D_HA, req, "waking (set %p):", req->rq_set);
 224                 ptlrpc_client_wake_req(req);
 225         }
 226         spin_unlock(&imp->imp_lock);
 227 }
 228
 229 void ptlrpc_request_handle_notconn(struct ptlrpc_request *failed_req)
 230 {
 231         struct obd_import *imp = failed_req->rq_import;
 232         ENTRY;
 233
 234         CDEBUG(D_HA, "import %s of %s@%s abruptly disconnected: reconnecting\n",
 235                imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
 236                imp->imp_connection->c_remote_uuid.uuid);
 237
 238         if (ptlrpc_set_import_discon(imp,
 239                               lustre_msg_get_conn_cnt(failed_req->rq_reqmsg))) {
 240                 if (!imp->imp_replayable) {
 241                         CDEBUG(D_HA, "import %s@%s for %s not replayable, "
 242                                "auto-deactivating\n",
 243                                obd2cli_tgt(imp->imp_obd),
 244                                imp->imp_connection->c_remote_uuid.uuid,
 245                                imp->imp_obd->obd_name);
 246                         ptlrpc_deactivate_import(imp);
 247                 }
 248                 /* to control recovery via lctl {disable|enable}_recovery */
 249                 if (imp->imp_deactive == 0)
 250                         ptlrpc_connect_import(imp);
 251         }
 252
 253         /* Wait for recovery to complete and resend. If evicted, then
 254            this request will be errored out later.*/
 255         spin_lock(&failed_req->rq_lock);
 256         if (!failed_req->rq_no_resend)
 257                 failed_req->rq_resend = 1;
 258         spin_unlock(&failed_req->rq_lock);
 259
 260         EXIT;
 261 }
 262
 263 /**
 264  * Administratively active/deactive a client.
 265  * This should only be called by the ioctl interface, currently
 266  *  - the lctl deactivate and activate commands
 267  *  - echo 0/1 >> /proc/osc/XXX/active
 268  *  - client umount -f (ll_umount_begin)
 269  */
 270 int ptlrpc_set_import_active(struct obd_import *imp, int active)
 271 {
 272         struct obd_device *obd = imp->imp_obd;
 273         int rc = 0;
 274
 275         ENTRY;
 276         LASSERT(obd);
 277
 278         /* When deactivating, mark import invalid, and abort in-flight
 279          * requests. */
 280         if (!active) {
 281                 LCONSOLE_WARN("setting import %s INACTIVE by administrator "
 282                               "request\n", obd2cli_tgt(imp->imp_obd));
 283
 284                 /* set before invalidate to avoid messages about imp_inval
 285                  * set without imp_deactive in ptlrpc_import_delay_req */
 286                 spin_lock(&imp->imp_lock);
 287                 imp->imp_deactive = 1;
 288                 spin_unlock(&imp->imp_lock);
 289
 290                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DEACTIVATE);
 291
 292                 ptlrpc_invalidate_import(imp);
 293         }
 294
 295         /* When activating, mark import valid, and attempt recovery */
 296         if (active) {
 297                 CDEBUG(D_HA, "setting import %s VALID\n",
 298                        obd2cli_tgt(imp->imp_obd));
 299
 300                 spin_lock(&imp->imp_lock);
 301                 imp->imp_deactive = 0;
 302                 spin_unlock(&imp->imp_lock);
 303                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_ACTIVATE);
 304
 305                 rc = ptlrpc_recover_import(imp, NULL, 0);
 306         }
 307
 308         RETURN(rc);
 309 }
 310 EXPORT_SYMBOL(ptlrpc_set_import_active);
 311
 312 /* Attempt to reconnect an import */
 313 int ptlrpc_recover_import(struct obd_import *imp, char *new_uuid, int async)
 314 {
 315         int rc = 0;
 316         ENTRY;
 317
 318         spin_lock(&imp->imp_lock);
 319         if (imp->imp_state == LUSTRE_IMP_NEW || imp->imp_deactive ||
 320             atomic_read(&imp->imp_inval_count))
 321                 rc = -EINVAL;
 322         spin_unlock(&imp->imp_lock);
 323         if (rc)
 324                 GOTO(out, rc);
 325
 326         /* force import to be disconnected. */
 327         ptlrpc_set_import_discon(imp, 0);
 328
 329         if (new_uuid) {
 330                 struct obd_uuid uuid;
 331
 332                 /* intruct import to use new uuid */
 333                 obd_str2uuid(&uuid, new_uuid);
 334                 rc = import_set_conn_priority(imp, &uuid);
 335                 if (rc)
 336                         GOTO(out, rc);
 337         }
 338
 339         /* Check if reconnect is already in progress */
 340         spin_lock(&imp->imp_lock);
 341         if (imp->imp_state != LUSTRE_IMP_DISCON) {
 342                 imp->imp_force_verify = 1;
 343                 rc = -EALREADY;
 344         }
 345         spin_unlock(&imp->imp_lock);
 346         if (rc)
 347                 GOTO(out, rc);
 348
 349         OBD_RACE(OBD_FAIL_PTLRPC_CONNECT_RACE);
 350
 351         rc = ptlrpc_connect_import(imp);
 352         if (rc)
 353                 GOTO(out, rc);
 354
 355         if (!async) {
 356                 struct l_wait_info lwi;
 357                 long secs = cfs_time_seconds(obd_timeout);
 358
 359                 CDEBUG(D_HA, "%s: recovery started, waiting %lu seconds\n",
 360                        obd2cli_tgt(imp->imp_obd), secs);
 361
 362                 lwi = LWI_TIMEOUT(secs, NULL, NULL);
 363                 rc = l_wait_event(imp->imp_recovery_waitq,
 364                                   !ptlrpc_import_in_recovery(imp), &lwi);
 365                 CDEBUG(D_HA, "%s: recovery finished\n",
 366                        obd2cli_tgt(imp->imp_obd));
 367         }
 368         EXIT;
 369
 370 out:
 371         return rc;
 372 }
 373 EXPORT_SYMBOL(ptlrpc_recover_import);
 374
 375 int ptlrpc_import_in_recovery(struct obd_import *imp)
 376 {
 377         int in_recovery = 1;
 378
 379         spin_lock(&imp->imp_lock);
 380         if (imp->imp_state == LUSTRE_IMP_FULL ||
 381             imp->imp_state == LUSTRE_IMP_CLOSED ||
 382             imp->imp_state == LUSTRE_IMP_DISCON ||
 383             imp->imp_obd->obd_no_recov)
 384                 in_recovery = 0;
 385         spin_unlock(&imp->imp_lock);
 386
 387         return in_recovery;
 388 }