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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2015, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/ptlrpc/recover.c
  37  *
  38  * Author: Mike Shaver <shaver@clusterfs.com>
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_RPC
  42 #include "../../include/linux/libcfs/libcfs.h"
  43
  44 #include "../include/obd_support.h"
  45 #include "../include/lustre_ha.h"
  46 #include "../include/lustre_net.h"
  47 #include "../include/lustre_import.h"
  48 #include "../include/lustre_export.h"
  49 #include "../include/obd.h"
  50 #include "../include/obd_class.h"
  51 #include <linux/list.h>
  52
  53 #include "ptlrpc_internal.h"
  54
  55 /**
  56  * Start recovery on disconnected import.
  57  * This is done by just attempting a connect
  58  */
  59 void ptlrpc_initiate_recovery(struct obd_import *imp)
  60 {
  61         CDEBUG(D_HA, "%s: starting recovery\n", obd2cli_tgt(imp->imp_obd));
  62         ptlrpc_connect_import(imp);
  63 }
  64
  65 /**
  66  * Identify what request from replay list needs to be replayed next
  67  * (based on what we have already replayed) and send it to server.
  68  */
  69 int ptlrpc_replay_next(struct obd_import *imp, int *inflight)
  70 {
  71         int rc = 0;
  72         struct list_head *tmp, *pos;
  73         struct ptlrpc_request *req = NULL;
  74         __u64 last_transno;
  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         spin_unlock(&imp->imp_lock);
  86
  87         CDEBUG(D_HA, "import %p from %s committed %llu last %llu\n",
  88                imp, obd2cli_tgt(imp->imp_obd),
  89                imp->imp_peer_committed_transno, last_transno);
  90
  91         /* Do I need to hold a lock across this iteration?  We shouldn't be
  92          * racing with any additions to the list, because we're in recovery
  93          * and are therefore not processing additional requests to add.  Calls
  94          * to ptlrpc_free_committed might commit requests, but nothing "newer"
  95          * than the one we're replaying (it can't be committed until it's
  96          * replayed, and we're doing that here).  l_f_e_safe protects against
  97          * problems with the current request being committed, in the unlikely
  98          * event of that race.  So, in conclusion, I think that it's safe to
  99          * perform this list-walk without the imp_lock held.
 100          *
 101          * But, the {mdc,osc}_replay_open callbacks both iterate
 102          * request lists, and have comments saying they assume the
 103          * imp_lock is being held by ptlrpc_replay, but it's not. it's
 104          * just a little race...
 105          */
 106
 107         /* Replay all the committed open requests on committed_list first */
 108         if (!list_empty(&imp->imp_committed_list)) {
 109                 tmp = imp->imp_committed_list.prev;
 110                 req = list_entry(tmp, struct ptlrpc_request,
 111                                      rq_replay_list);
 112
 113                 /* The last request on committed_list hasn't been replayed */
 114                 if (req->rq_transno > last_transno) {
 115                         /* Since the imp_committed_list is immutable before
 116                          * all of it's requests being replayed, it's safe to
 117                          * use a cursor to accelerate the search
 118                          */
 119                         imp->imp_replay_cursor = imp->imp_replay_cursor->next;
 120
 121                         while (imp->imp_replay_cursor !=
 122                                &imp->imp_committed_list) {
 123                                 req = list_entry(imp->imp_replay_cursor,
 124                                                  struct ptlrpc_request,
 125                                                  rq_replay_list);
 126                                 if (req->rq_transno > last_transno)
 127                                         break;
 128
 129                                 req = NULL;
 130                                 imp->imp_replay_cursor =
 131                                         imp->imp_replay_cursor->next;
 132                         }
 133                 } else {
 134                         /* All requests on committed_list have been replayed */
 135                         imp->imp_replay_cursor = &imp->imp_committed_list;
 136                         req = NULL;
 137                 }
 138         }
 139
 140         /* All the requests in committed list have been replayed, let's replay
 141          * the imp_replay_list
 142          */
 143         if (!req) {
 144                 list_for_each_safe(tmp, pos, &imp->imp_replay_list) {
 145                         req = list_entry(tmp, struct ptlrpc_request,
 146                                          rq_replay_list);
 147
 148                         if (req->rq_transno > last_transno)
 149                                 break;
 150                         req = NULL;
 151                 }
 152         }
 153
 154         /* If need to resend the last sent transno (because a reconnect
 155          * has occurred), then stop on the matching req and send it again.
 156          * If, however, the last sent transno has been committed then we
 157          * continue replay from the next request.
 158          */
 159         if (req && imp->imp_resend_replay)
 160                 lustre_msg_add_flags(req->rq_reqmsg, MSG_RESENT);
 161
 162         spin_lock(&imp->imp_lock);
 163         imp->imp_resend_replay = 0;
 164         spin_unlock(&imp->imp_lock);
 165
 166         if (req) {
 167                 rc = ptlrpc_replay_req(req);
 168                 if (rc) {
 169                         CERROR("recovery replay error %d for req %llu\n",
 170                                rc, req->rq_xid);
 171                         return rc;
 172                 }
 173                 *inflight = 1;
 174         }
 175         return rc;
 176 }
 177
 178 /**
 179  * Schedule resending of request on sending_list. This is done after
 180  * we completed replaying of requests and locks.
 181  */
 182 int ptlrpc_resend(struct obd_import *imp)
 183 {
 184         struct ptlrpc_request *req, *next;
 185
 186         /* As long as we're in recovery, nothing should be added to the sending
 187          * list, so we don't need to hold the lock during this iteration and
 188          * resend process.
 189          */
 190         /* Well... what if lctl recover is called twice at the same time?
 191          */
 192         spin_lock(&imp->imp_lock);
 193         if (imp->imp_state != LUSTRE_IMP_RECOVER) {
 194                 spin_unlock(&imp->imp_lock);
 195                 return -1;
 196         }
 197
 198         list_for_each_entry_safe(req, next, &imp->imp_sending_list,
 199                                      rq_list) {
 200                 LASSERTF((long)req > PAGE_CACHE_SIZE && req != LP_POISON,
 201                          "req %p bad\n", req);
 202                 LASSERTF(req->rq_type != LI_POISON, "req %p freed\n", req);
 203                 if (!ptlrpc_no_resend(req))
 204                         ptlrpc_resend_req(req);
 205         }
 206         spin_unlock(&imp->imp_lock);
 207
 208         return 0;
 209 }
 210 EXPORT_SYMBOL(ptlrpc_resend);
 211
 212 /**
 213  * Go through all requests in delayed list and wake their threads
 214  * for resending
 215  */
 216 void ptlrpc_wake_delayed(struct obd_import *imp)
 217 {
 218         struct list_head *tmp, *pos;
 219         struct ptlrpc_request *req;
 220
 221         spin_lock(&imp->imp_lock);
 222         list_for_each_safe(tmp, pos, &imp->imp_delayed_list) {
 223                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 224
 225                 DEBUG_REQ(D_HA, req, "waking (set %p):", req->rq_set);
 226                 ptlrpc_client_wake_req(req);
 227         }
 228         spin_unlock(&imp->imp_lock);
 229 }
 230 EXPORT_SYMBOL(ptlrpc_wake_delayed);
 231
 232 void ptlrpc_request_handle_notconn(struct ptlrpc_request *failed_req)
 233 {
 234         struct obd_import *imp = failed_req->rq_import;
 235
 236         CDEBUG(D_HA, "import %s of %s@%s abruptly disconnected: reconnecting\n",
 237                imp->imp_obd->obd_name, obd2cli_tgt(imp->imp_obd),
 238                imp->imp_connection->c_remote_uuid.uuid);
 239
 240         if (ptlrpc_set_import_discon(imp,
 241                               lustre_msg_get_conn_cnt(failed_req->rq_reqmsg))) {
 242                 if (!imp->imp_replayable) {
 243                         CDEBUG(D_HA, "import %s@%s for %s not replayable, auto-deactivating\n",
 244                                obd2cli_tgt(imp->imp_obd),
 245                                imp->imp_connection->c_remote_uuid.uuid,
 246                                imp->imp_obd->obd_name);
 247                         ptlrpc_deactivate_import(imp);
 248                 }
 249                 /* to control recovery via lctl {disable|enable}_recovery */
 250                 if (imp->imp_deactive == 0)
 251                         ptlrpc_connect_import(imp);
 252         }
 253
 254         /* Wait for recovery to complete and resend. If evicted, then
 255          * this request will be errored out later.
 256          */
 257         spin_lock(&failed_req->rq_lock);
 258         if (!failed_req->rq_no_resend)
 259                 failed_req->rq_resend = 1;
 260         spin_unlock(&failed_req->rq_lock);
 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 >> /sys/fs/lustre/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         LASSERT(obd);
 276
 277         /* When deactivating, mark import invalid, and abort in-flight
 278          * requests.
 279          */
 280         if (!active) {
 281                 LCONSOLE_WARN("setting import %s INACTIVE by administrator request\n",
 282                               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                  */
 287                 spin_lock(&imp->imp_lock);
 288                 imp->imp_deactive = 1;
 289                 spin_unlock(&imp->imp_lock);
 290
 291                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_DEACTIVATE);
 292
 293                 ptlrpc_invalidate_import(imp);
 294         }
 295
 296         /* When activating, mark import valid, and attempt recovery */
 297         if (active) {
 298                 CDEBUG(D_HA, "setting import %s VALID\n",
 299                        obd2cli_tgt(imp->imp_obd));
 300
 301                 spin_lock(&imp->imp_lock);
 302                 imp->imp_deactive = 0;
 303                 spin_unlock(&imp->imp_lock);
 304                 obd_import_event(imp->imp_obd, imp, IMP_EVENT_ACTIVATE);
 305
 306                 rc = ptlrpc_recover_import(imp, NULL, 0);
 307         }
 308
 309         return rc;
 310 }
 311 EXPORT_SYMBOL(ptlrpc_set_import_active);
 312
 313 /* Attempt to reconnect an import */
 314 int ptlrpc_recover_import(struct obd_import *imp, char *new_uuid, int async)
 315 {
 316         int rc = 0;
 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;
 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;
 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;
 348
 349         rc = ptlrpc_connect_import(imp);
 350         if (rc)
 351                 goto out;
 352
 353         if (!async) {
 354                 struct l_wait_info lwi;
 355                 int secs = cfs_time_seconds(obd_timeout);
 356
 357                 CDEBUG(D_HA, "%s: recovery started, waiting %u seconds\n",
 358                        obd2cli_tgt(imp->imp_obd), secs);
 359
 360                 lwi = LWI_TIMEOUT(secs, NULL, NULL);
 361                 rc = l_wait_event(imp->imp_recovery_waitq,
 362                                   !ptlrpc_import_in_recovery(imp), &lwi);
 363                 CDEBUG(D_HA, "%s: recovery finished\n",
 364                        obd2cli_tgt(imp->imp_obd));
 365         }
 366
 367 out:
 368         return rc;
 369 }
 370 EXPORT_SYMBOL(ptlrpc_recover_import);
 371
 372 int ptlrpc_import_in_recovery(struct obd_import *imp)
 373 {
 374         int in_recovery = 1;
 375
 376         spin_lock(&imp->imp_lock);
 377         if (imp->imp_state == LUSTRE_IMP_FULL ||
 378             imp->imp_state == LUSTRE_IMP_CLOSED ||
 379             imp->imp_state == LUSTRE_IMP_DISCON ||
 380             imp->imp_obd->obd_no_recov)
 381                 in_recovery = 0;
 382         spin_unlock(&imp->imp_lock);
 383
 384         return in_recovery;
 385 }