drivers/staging/lustre/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, 2015, 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/libcfs/libcfs.h>
  39
  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 #include <linux/list.h>
  48
  49 #include "ptlrpc_internal.h"
  50
  51 /**
  52  * Start recovery on disconnected import.
  53  * This is done by just attempting a connect
  54  */
  55 void ptlrpc_initiate_recovery(struct obd_import *imp)
  56 {
  57         CDEBUG(D_HA, "%s: starting recovery\n", obd2cli_tgt(imp->imp_obd));
  58         ptlrpc_connect_import(imp);
  59 }
  60
  61 /**
  62  * Identify what request from replay list needs to be replayed next
  63  * (based on what we have already replayed) and send it to server.
  64  */
  65 int ptlrpc_replay_next(struct obd_import *imp, int *inflight)
  66 {
  67         int rc = 0;
  68         struct list_head *tmp, *pos;
  69         struct ptlrpc_request *req = NULL;
  70         __u64 last_transno;
  71
  72         *inflight = 0;
  73
  74         /* It might have committed some after we last spoke, so make sure we
  75          * get rid of them now.
  76          */
  77         spin_lock(&imp->imp_lock);
  78         imp->imp_last_transno_checked = 0;
  79         ptlrpc_free_committed(imp);
  80         last_transno = imp->imp_last_replay_transno;
  81
  82         CDEBUG(D_HA, "import %p from %s committed %llu last %llu\n",
  83                imp, obd2cli_tgt(imp->imp_obd),
  84                imp->imp_peer_committed_transno, last_transno);
  85
  86         /* Replay all the committed open requests on committed_list first */
  87         if (!list_empty(&imp->imp_committed_list)) {
  88                 tmp = imp->imp_committed_list.prev;
  89                 req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
  90
  91                 /* The last request on committed_list hasn't been replayed */
  92                 if (req->rq_transno > last_transno) {
  93                         if (!imp->imp_resend_replay ||
  94                             imp->imp_replay_cursor == &imp->imp_committed_list)
  95                                 imp->imp_replay_cursor = imp->imp_replay_cursor->next;
  96
  97                         while (imp->imp_replay_cursor !=
  98                                &imp->imp_committed_list) {
  99                                 req = list_entry(imp->imp_replay_cursor,
 100                                                  struct ptlrpc_request,
 101                                                  rq_replay_list);
 102                                 if (req->rq_transno > last_transno)
 103                                         break;
 104
 105                                 req = NULL;
 106                                 LASSERT(!list_empty(imp->imp_replay_cursor));
 107                                 imp->imp_replay_cursor =
 108                                         imp->imp_replay_cursor->next;
 109                         }
 110                 } else {
 111                         /* All requests on committed_list have been replayed */
 112                         imp->imp_replay_cursor = &imp->imp_committed_list;
 113                         req = NULL;
 114                 }
 115         }
 116
 117         /* All the requests in committed list have been replayed, let's replay
 118          * the imp_replay_list
 119          */
 120         if (!req) {
 121                 list_for_each_safe(tmp, pos, &imp->imp_replay_list) {
 122                         req = list_entry(tmp, struct ptlrpc_request,
 123                                          rq_replay_list);
 124
 125                         if (req->rq_transno > last_transno)
 126                                 break;
 127                         req = NULL;
 128                 }
 129         }
 130
 131         /* If need to resend the last sent transno (because a reconnect
 132          * has occurred), then stop on the matching req and send it again.
 133          * If, however, the last sent transno has been committed then we
 134          * continue replay from the next request.
 135          */
 136         if (req && imp->imp_resend_replay)
 137                 lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
 138
 139         /* The resend replay request may have been removed from the
 140          * unreplied list.
 141          */
 142         if (req && imp->imp_resend_replay &&
 143             list_empty(&req->rq_unreplied_list)) {
 144                 ptlrpc_add_unreplied(req);
 145                 imp->imp_known_replied_xid = ptlrpc_known_replied_xid(imp);
 146         }
 147
 148         imp->imp_resend_replay = 0;
 149         spin_unlock(&imp->imp_lock);
 150
 151         if (req) {
 152                 /* The request should have been added back in unreplied list
 153                  * by ptlrpc_prepare_replay().
 154                  */
 155                 LASSERT(!list_empty(&req->rq_unreplied_list));
 156
 157                 rc = ptlrpc_replay_req(req);
 158                 if (rc) {
 159                         CERROR("recovery replay error %d for req %llu\n",
 160                                rc, req->rq_xid);
 161                         return rc;
 162                 }
 163                 *inflight = 1;
 164         }
 165         return rc;
 166 }
 167
 168 /**
 169  * Schedule resending of request on sending_list. This is done after
 170  * we completed replaying of requests and locks.
 171  */
 172 int ptlrpc_resend(struct obd_import *imp)
 173 {
 174         struct ptlrpc_request *req, *next;
 175
 176         /* As long as we're in recovery, nothing should be added to the sending
 177          * list, so we don't need to hold the lock during this iteration and
 178          * resend process.
 179          */
 180         /* Well... what if lctl recover is called twice at the same time?
 181          */
 182         spin_lock(&imp->imp_lock);
 183         if (imp->imp_state != LUSTRE_IMP_RECOVER) {
 184                 spin_unlock(&imp->imp_lock);
 185                 return -1;
 186         }
 187
 188         list_for_each_entry_safe(req, next, &imp->imp_sending_list, rq_list) {
 189                 LASSERTF((long)req > PAGE_SIZE && req != LP_POISON,
 190                          "req %p bad\n", req);
 191                 LASSERTF(req->rq_type != LI_POISON, "req %p freed\n", req);
 192
 193                 /*
 194                  * If the request is allowed to be sent during replay and it
 195                  * is not timeout yet, then it does not need to be resent.
 196                  */
 197                 if (!ptlrpc_no_resend(req) &&
 198                     (req->rq_timedout || !req->rq_allow_replay))
 199                         ptlrpc_resend_req(req);
 200         }
 201         spin_unlock(&imp->imp_lock);
 202
 203         OBD_FAIL_TIMEOUT(OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT, 2);
 204         return 0;
 205 }
 206
 207 /**
 208  * Go through all requests in delayed list and wake their threads
 209  * for resending
 210  */
 211 void ptlrpc_wake_delayed(struct obd_import *imp)
 212 {
 213         struct list_head *tmp, *pos;
 214         struct ptlrpc_request *req;
 215
 216         spin_lock(&imp->imp_lock);
 217         list_for_each_safe(tmp, pos, &imp->imp_delayed_list) {
 218                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 219
 220                 DEBUG_REQ(D_HA, req, "waking (set %p):", req->rq_set);
 221                 ptlrpc_client_wake_req(req);
 222         }
 223         spin_unlock(&imp->imp_lock);
 224 }
 225
 226 void ptlrpc_request_handle_notconn(struct ptlrpc_request *failed_req)
 227 {
 228         struct obd_import *imp = failed_req->rq_import;
 229
 230         CDEBUG(D_HA, "import %s of %s@%s abruptly disconnected: reconnecting\n",
 231                imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
 232                imp->imp_connection->c_remote_uuid.uuid);
 233
 234         if (ptlrpc_set_import_discon(imp,
 235                               lustre_msg_get_conn_cnt(failed_req->rq_reqmsg))) {
 236                 if (!imp->imp_replayable) {
 237                         CDEBUG(D_HA, "import %s@%s for %s not replayable, auto-deactivating\n",
 238                                obd2cli_tgt(imp->imp_obd),
 239                                imp->imp_connection->c_remote_uuid.uuid,
 240                                imp->imp_obd->obd_name);
 241                         ptlrpc_deactivate_import(imp);
 242                 }
 243                 /* to control recovery via lctl {disable|enable}_recovery */
 244                 if (imp->imp_deactive == 0)
 245                         ptlrpc_connect_import(imp);
 246         }
 247
 248         /* Wait for recovery to complete and resend. If evicted, then
 249          * this request will be errored out later.
 250          */
 251         spin_lock(&failed_req->rq_lock);
 252         if (!failed_req->rq_no_resend)
 253                 failed_req->rq_resend = 1;
 254         spin_unlock(&failed_req->rq_lock);
 255 }
 256
 257 /**
 258  * Administratively active/deactive a client.
 259  * This should only be called by the ioctl interface, currently
 260  *  - the lctl deactivate and activate commands
 261  *  - echo 0/1 >> /sys/fs/lustre/osc/XXX/active
 262  *  - client umount -f (ll_umount_begin)
 263  */
 264 int ptlrpc_set_import_active(struct obd_import *imp, int active)
 265 {
 266         struct obd_device *obd = imp->imp_obd;
 267         int rc = 0;
 268
 269         LASSERT(obd);
 270
 271         /* When deactivating, mark import invalid, and abort in-flight
 272          * requests.
 273          */
 274         if (!active) {
 275                 LCONSOLE_WARN("setting import %s INACTIVE by administrator request\n",
 276                               obd2cli_tgt(imp->imp_obd));
 277
 278                 /* set before invalidate to avoid messages about imp_inval
 279                  * set without imp_deactive in ptlrpc_import_delay_req
 280                  */
 281                 spin_lock(&imp->imp_lock);
 282                 imp->imp_deactive = 1;
 283                 spin_unlock(&imp->imp_lock);
 284
 285                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DEACTIVATE);
 286
 287                 ptlrpc_invalidate_import(imp);
 288         }
 289
 290         /* When activating, mark import valid, and attempt recovery */
 291         if (active) {
 292                 CDEBUG(D_HA, "setting import %s VALID\n",
 293                        obd2cli_tgt(imp->imp_obd));
 294
 295                 spin_lock(&imp->imp_lock);
 296                 imp->imp_deactive = 0;
 297                 spin_unlock(&imp->imp_lock);
 298                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_ACTIVATE);
 299
 300                 rc = ptlrpc_recover_import(imp, NULL, 0);
 301         }
 302
 303         return rc;
 304 }
 305 EXPORT_SYMBOL(ptlrpc_set_import_active);
 306
 307 /* Attempt to reconnect an import */
 308 int ptlrpc_recover_import(struct obd_import *imp, char *new_uuid, int async)
 309 {
 310         int rc = 0;
 311
 312         spin_lock(&imp->imp_lock);
 313         if (imp->imp_state == LUSTRE_IMP_NEW || imp->imp_deactive ||
 314             atomic_read(&imp->imp_inval_count))
 315                 rc = -EINVAL;
 316         spin_unlock(&imp->imp_lock);
 317         if (rc)
 318                 goto out;
 319
 320         /* force import to be disconnected. */
 321         ptlrpc_set_import_discon(imp, 0);
 322
 323         if (new_uuid) {
 324                 struct obd_uuid uuid;
 325
 326                 /* intruct import to use new uuid */
 327                 obd_str2uuid(&uuid, new_uuid);
 328                 rc = import_set_conn_priority(imp, &uuid);
 329                 if (rc)
 330                         goto out;
 331         }
 332
 333         /* Check if reconnect is already in progress */
 334         spin_lock(&imp->imp_lock);
 335         if (imp->imp_state != LUSTRE_IMP_DISCON) {
 336                 imp->imp_force_verify = 1;
 337                 rc = -EALREADY;
 338         }
 339         spin_unlock(&imp->imp_lock);
 340         if (rc)
 341                 goto out;
 342
 343         rc = ptlrpc_connect_import(imp);
 344         if (rc)
 345                 goto out;
 346
 347         if (!async) {
 348                 struct l_wait_info lwi;
 349                 int secs = cfs_time_seconds(obd_timeout);
 350
 351                 CDEBUG(D_HA, "%s: recovery started, waiting %u seconds\n",
 352                        obd2cli_tgt(imp->imp_obd), secs);
 353
 354                 lwi = LWI_TIMEOUT(secs, NULL, NULL);
 355                 rc = l_wait_event(imp->imp_recovery_waitq,
 356                                   !ptlrpc_import_in_recovery(imp), &lwi);
 357                 CDEBUG(D_HA, "%s: recovery finished\n",
 358                        obd2cli_tgt(imp->imp_obd));
 359         }
 360
 361 out:
 362         return rc;
 363 }
 364 EXPORT_SYMBOL(ptlrpc_recover_import);
 365
 366 int ptlrpc_import_in_recovery(struct obd_import *imp)
 367 {
 368         int in_recovery = 1;
 369
 370         spin_lock(&imp->imp_lock);
 371         if (imp->imp_state == LUSTRE_IMP_FULL ||
 372             imp->imp_state == LUSTRE_IMP_CLOSED ||
 373             imp->imp_state == LUSTRE_IMP_DISCON ||
 374             imp->imp_obd->obd_no_recov)
 375                 in_recovery = 0;
 376         spin_unlock(&imp->imp_lock);
 377
 378         return in_recovery;
 379 }