lustre/ptlrpc/recover.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Portal-RPC reconnection and replay operations, for use in recovery.
   5  *
   6  *  Copyright (c) 2002, 2003 Cluster File Systems, Inc.
   7  *   Author: Mike Shaver <shaver@clusterfs.com>
   8  *
   9  *   This file is part of Lustre, http://www.lustre.org.
  10  *
  11  *   Lustre is free software; you can redistribute it and/or
  12  *   modify it under the terms of version 2 of the GNU General Public
  13  *   License as published by the Free Software Foundation.
  14  *
  15  *   Lustre is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *   GNU General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU General Public License
  21  *   along with Lustre; if not, write to the Free Software
  22  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 #define DEBUG_SUBSYSTEM S_RPC
  26 #ifdef __KERNEL__
  27 # include <linux/config.h>
  28 # include <linux/module.h>
  29 # include <linux/kmod.h>
  30 #else
  31 # include <liblustre.h>
  32 #endif
  33
  34 #include <linux/obd_support.h>
  35 #include <linux/lustre_ha.h>
  36 #include <linux/lustre_net.h>
  37 #include <linux/lustre_import.h>
  38 #include <linux/lustre_export.h>
  39 #include <linux/obd.h>
  40 #include <linux/obd_ost.h>
  41 #include <linux/obd_class.h>
  42 #include <linux/obd_lov.h> /* for IOC_LOV_SET_OSC_ACTIVE */
  43
  44 #include "ptlrpc_internal.h"
  45
  46 static int ptlrpc_recover_import_no_retry(struct obd_import *, char *);
  47
  48 void ptlrpc_run_recovery_over_upcall(struct obd_device *obd)
  49 {
  50         char *argv[4];
  51         char *envp[3];
  52         int rc;
  53         ENTRY;
  54
  55         argv[0] = obd_lustre_upcall;
  56         argv[1] = "RECOVERY_OVER";
  57         argv[2] = obd->obd_uuid.uuid;
  58         argv[3] = NULL;
  59
  60         envp[0] = "HOME=/";
  61         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
  62         envp[2] = NULL;
  63
  64         rc = USERMODEHELPER(argv[0], argv, envp);
  65         if (rc < 0) {
  66                 CERROR("Error invoking recovery upcall %s %s %s: %d; check "
  67                        "/proc/sys/lustre/upcall\n",
  68                        argv[0], argv[1], argv[2], rc);
  69
  70         } else {
  71                 CERROR("Invoked upcall %s %s %s\n",
  72                        argv[0], argv[1], argv[2]);
  73         }
  74 }
  75
  76 void ptlrpc_run_failed_import_upcall(struct obd_import* imp)
  77 {
  78 #ifdef __KERNEL__
  79         unsigned long flags;
  80         char *argv[7];
  81         char *envp[3];
  82         int rc;
  83         ENTRY;
  84
  85         spin_lock_irqsave(&imp->imp_lock, flags);
  86         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
  87                 spin_unlock_irqrestore(&imp->imp_lock, flags);
  88                 EXIT;
  89                 return;
  90         }
  91         spin_unlock_irqrestore(&imp->imp_lock, flags);
  92
  93         argv[0] = obd_lustre_upcall;
  94         argv[1] = "FAILED_IMPORT";
  95         argv[2] = imp->imp_target_uuid.uuid;
  96         argv[3] = imp->imp_obd->obd_name;
  97         argv[4] = imp->imp_connection->c_remote_uuid.uuid;
  98         argv[5] = imp->imp_obd->obd_uuid.uuid;
  99         argv[6] = NULL;
 100
 101         envp[0] = "HOME=/";
 102         envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 103         envp[2] = NULL;
 104
 105         rc = USERMODEHELPER(argv[0], argv, envp);
 106         if (rc < 0) {
 107                 CERROR("Error invoking recovery upcall %s %s %s %s %s: %d; "
 108                        "check /proc/sys/lustre/lustre_upcall\n",
 109                        argv[0], argv[1], argv[2], argv[3], argv[4],rc);
 110
 111         } else {
 112                 CERROR("Invoked upcall %s %s %s %s %s\n",
 113                        argv[0], argv[1], argv[2], argv[3], argv[4]);
 114         }
 115 #else
 116         if (imp->imp_state == LUSTRE_IMP_CLOSED) {
 117                 EXIT;
 118                 return;
 119         }
 120         ptlrpc_recover_import(imp, NULL);
 121 #endif
 122 }
 123
 124 /* This might block waiting for the upcall to start, so it should
 125  * not be called from a thread that shouldn't block. (Like ptlrpcd) */
 126 void ptlrpc_initiate_recovery(struct obd_import *imp)
 127 {
 128         ENTRY;
 129
 130         LASSERT (obd_lustre_upcall != NULL);
 131
 132         if (strcmp(obd_lustre_upcall, "DEFAULT") == 0) {
 133                 CDEBUG(D_ERROR, "%s: starting recovery without upcall\n",
 134                         imp->imp_target_uuid.uuid);
 135                 ptlrpc_connect_import(imp, NULL);
 136         }
 137         else if (strcmp(obd_lustre_upcall, "NONE") == 0) {
 138                 CDEBUG(D_ERROR, "%s: recovery diabled\n",
 139                         imp->imp_target_uuid.uuid);
 140         }
 141         else {
 142                 CDEBUG(D_ERROR, "%s: calling upcall to start recovery\n",
 143                         imp->imp_target_uuid.uuid);
 144                 ptlrpc_run_failed_import_upcall(imp);
 145         }
 146
 147         EXIT;
 148 }
 149
 150 int ptlrpc_replay_next(struct obd_import *imp, int *inflight)
 151 {
 152         int rc = 0;
 153         struct list_head *tmp, *pos;
 154         struct ptlrpc_request *req;
 155         unsigned long flags;
 156         __u64 last_transno;
 157         ENTRY;
 158
 159         *inflight = 0;
 160
 161         /* It might have committed some after we last spoke, so make sure we
 162          * get rid of them now.
 163          */
 164         spin_lock_irqsave(&imp->imp_lock, flags);
 165         ptlrpc_free_committed(imp);
 166         last_transno = imp->imp_last_replay_transno;
 167         spin_unlock_irqrestore(&imp->imp_lock, flags);
 168
 169         CDEBUG(D_HA, "import %p from %s committed "LPU64" last "LPU64"\n",
 170                imp, imp->imp_target_uuid.uuid, imp->imp_peer_committed_transno,
 171                last_transno);
 172
 173         /* Do I need to hold a lock across this iteration?  We shouldn't be
 174          * racing with any additions to the list, because we're in recovery
 175          * and are therefore not processing additional requests to add.  Calls
 176          * to ptlrpc_free_committed might commit requests, but nothing "newer"
 177          * than the one we're replaying (it can't be committed until it's
 178          * replayed, and we're doing that here).  l_f_e_safe protects against
 179          * problems with the current request being committed, in the unlikely
 180          * event of that race.  So, in conclusion, I think that it's safe to
 181          * perform this list-walk without the imp_lock held.
 182          *
 183          * But, the {mdc,osc}_replay_open callbacks both iterate
 184          * request lists, and have comments saying they assume the
 185          * imp_lock is being held by ptlrpc_replay, but it's not. it's
 186          * just a little race...
 187          */
 188         list_for_each_safe(tmp, pos, &imp->imp_replay_list) {
 189                 req = list_entry(tmp, struct ptlrpc_request, rq_replay_list);
 190                 if (req->rq_transno > last_transno) {
 191                         rc = ptlrpc_replay_req(req);
 192                         if (rc) {
 193                                 CERROR("recovery replay error %d for req "
 194                                        LPD64"\n", rc, req->rq_xid);
 195                                 RETURN(rc);
 196                         }
 197                         *inflight = 1;
 198                         break;
 199                 }
 200         }
 201         RETURN(rc);
 202 }
 203
 204 int ptlrpc_resend(struct obd_import *imp)
 205 {
 206         struct list_head *tmp, *pos;
 207         struct ptlrpc_request *req;
 208         unsigned long flags;
 209
 210         ENTRY;
 211
 212         /* As long as we're in recovery, nothing should be added to the sending
 213          * list, so we don't need to hold the lock during this iteration and
 214          * resend process.
 215          */
 216         /* Well... what if lctl recover is called twice at the same time?
 217          */
 218         spin_lock_irqsave(&imp->imp_lock, flags);
 219         if (imp->imp_state != LUSTRE_IMP_RECOVER) {
 220                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 221                 RETURN(-1);
 222         }
 223         spin_unlock_irqrestore(&imp->imp_lock, flags);
 224
 225         list_for_each_safe(tmp, pos, &imp->imp_sending_list) {
 226                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 227                 ptlrpc_resend_req(req);
 228         }
 229
 230         RETURN(0);
 231 }
 232
 233 void ptlrpc_wake_delayed(struct obd_import *imp)
 234 {
 235         unsigned long flags;
 236         struct list_head *tmp, *pos;
 237         struct ptlrpc_request *req;
 238
 239         spin_lock_irqsave(&imp->imp_lock, flags);
 240         list_for_each_safe(tmp, pos, &imp->imp_delayed_list) {
 241                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 242
 243                 DEBUG_REQ(D_HA, req, "waking (set %p):", req->rq_set);
 244                 ptlrpc_wake_client_req(req);
 245         }
 246         spin_unlock_irqrestore(&imp->imp_lock, flags);
 247 }
 248
 249 void ptlrpc_request_handle_notconn(struct ptlrpc_request *failed_req)
 250 {
 251         int rc;
 252         struct obd_import *imp= failed_req->rq_import;
 253         unsigned long flags;
 254         ENTRY;
 255
 256         CDEBUG(D_HA, "import %s of %s@%s abruptly disconnected: reconnecting\n",
 257                imp->imp_obd->obd_name,
 258                imp->imp_target_uuid.uuid,
 259                imp->imp_connection->c_remote_uuid.uuid);
 260
 261         ptlrpc_set_import_discon(imp);
 262
 263         rc = ptlrpc_connect_import(imp, NULL);
 264
 265         /* Wait for recovery to complete and resend. If evicted, then
 266            this request will be errored out later.*/
 267         spin_lock_irqsave(&failed_req->rq_lock, flags);
 268         if (!failed_req->rq_no_resend)
 269                 failed_req->rq_resend = 1;
 270         spin_unlock_irqrestore(&failed_req->rq_lock, flags);
 271
 272         EXIT;
 273 }
 274
 275 /*
 276  * This should only be called by the ioctl interface, currently
 277  * with the lctl deactivate and activate commands.
 278  */
 279 int ptlrpc_set_import_active(struct obd_import *imp, int active)
 280 {
 281         struct obd_device *obd = imp->imp_obd;
 282         unsigned long flags;
 283         int rc = 0;
 284
 285         LASSERT(obd);
 286
 287         /* When deactivating, mark import invalid, and abort in-flight
 288          * requests. */
 289         if (!active) {
 290                 ptlrpc_invalidate_import(imp);
 291         }
 292
 293         /* When activating, mark import valid, and attempt recovery */
 294         if (active) {
 295                 CDEBUG(D_HA, "setting import %s VALID\n",
 296                        imp->imp_target_uuid.uuid);
 297                 spin_lock_irqsave(&imp->imp_lock, flags);
 298                 imp->imp_invalid = 0;
 299                 spin_unlock_irqrestore(&imp->imp_lock, flags);
 300
 301                 rc = ptlrpc_recover_import(imp, NULL);
 302                 if (rc) {
 303                         spin_lock_irqsave(&imp->imp_lock, flags);
 304                         imp->imp_invalid = 1;
 305                         spin_unlock_irqrestore(&imp->imp_lock, flags);
 306                 }
 307         }
 308
 309         RETURN(rc);
 310 }
 311
 312 int ptlrpc_recover_import(struct obd_import *imp, char *new_uuid)
 313 {
 314         int rc;
 315         ENTRY;
 316
 317         /* force import to be disconnected. */
 318         ptlrpc_set_import_discon(imp);
 319
 320         rc = ptlrpc_recover_import_no_retry(imp, new_uuid);
 321
 322         RETURN(rc);
 323 }
 324
 325 int ptlrpc_import_in_recovery(struct obd_import *imp)
 326 {
 327         unsigned long flags;
 328         int in_recovery = 1;
 329         spin_lock_irqsave(&imp->imp_lock, flags);
 330         if (imp->imp_state == LUSTRE_IMP_FULL ||
 331             imp->imp_state == LUSTRE_IMP_CLOSED ||
 332             imp->imp_state == LUSTRE_IMP_DISCON)
 333                 in_recovery = 0;
 334         spin_unlock_irqrestore(&imp->imp_lock, flags);
 335         return in_recovery;
 336 }
 337
 338 static int ptlrpc_recover_import_no_retry(struct obd_import *imp,
 339                                           char *new_uuid)
 340 {
 341         int rc;
 342         unsigned long flags;
 343         int in_recovery = 0;
 344         struct l_wait_info lwi;
 345         ENTRY;
 346
 347         spin_lock_irqsave(&imp->imp_lock, flags);
 348         if (imp->imp_state != LUSTRE_IMP_DISCON) {
 349                 in_recovery = 1;
 350         }
 351         spin_unlock_irqrestore(&imp->imp_lock, flags);
 352
 353         if (in_recovery == 1)
 354                 RETURN(-EALREADY);
 355
 356
 357         rc = ptlrpc_connect_import(imp, new_uuid);
 358         if (rc)
 359                 RETURN(rc);
 360
 361         CDEBUG(D_ERROR, "%s: recovery started, waiting\n",
 362                imp->imp_target_uuid.uuid);
 363
 364         lwi = LWI_TIMEOUT(MAX(obd_timeout * HZ, 1), NULL, NULL);
 365         rc = l_wait_event(imp->imp_recovery_waitq,
 366                           !ptlrpc_import_in_recovery(imp), &lwi);
 367         CDEBUG(D_ERROR, "%s: recovery finished\n",
 368                imp->imp_target_uuid.uuid);
 369
 370         RETURN(rc);
 371
 372 }
 373
 374 void ptlrpc_fail_export(struct obd_export *exp)
 375 {
 376         int rc, already_failed;
 377         unsigned long flags;
 378
 379         spin_lock_irqsave(&exp->exp_lock, flags);
 380         already_failed = exp->exp_failed;
 381         exp->exp_failed = 1;
 382         spin_unlock_irqrestore(&exp->exp_lock, flags);
 383
 384         if (already_failed) {
 385                 CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n",
 386                        exp, exp->exp_client_uuid.uuid);
 387                 return;
 388         }
 389
 390         CDEBUG(D_HA, "disconnecting export %p/%s\n",
 391                exp, exp->exp_client_uuid.uuid);
 392
 393         /* Most callers into obd_disconnect are removing their own reference
 394          * (request, for example) in addition to the one from the hash table.
 395          * We don't have such a reference here, so make one. */
 396         class_export_get(exp);
 397         rc = obd_disconnect(exp, 0);
 398         if (rc)
 399                 CERROR("disconnecting export %p failed: %d\n", exp, rc);
 400 }