lustre/ldlm/ldlm_lib.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2003 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of Lustre, http://www.lustre.org.
   7  *
   8  *   Lustre is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Lustre is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Lustre; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #ifndef EXPORT_SYMTAB
  23 # define EXPORT_SYMTAB
  24 #endif
  25 #define DEBUG_SUBSYSTEM S_LDLM
  26
  27 #ifdef __KERNEL__
  28 # include <linux/module.h>
  29 #else
  30 # include <liblustre.h>
  31 #endif
  32 #include <linux/obd.h>
  33 #include <linux/obd_ost.h> /* for LUSTRE_OSC_NAME */
  34 #include <linux/lustre_mds.h> /* for LUSTRE_MDC_NAME */
  35 #include <linux/lustre_mgmt.h>
  36 #include <linux/lustre_dlm.h>
  37 #include <linux/lustre_net.h>
  38
  39 int client_obd_setup(struct obd_device *obddev, obd_count len, void *buf)
  40 {
  41         struct ptlrpc_connection *conn;
  42         struct lustre_cfg* lcfg = buf;
  43         struct client_obd *cli = &obddev->u.cli;
  44         struct obd_import *imp;
  45         struct obd_uuid server_uuid;
  46         int rq_portal, rp_portal, connect_op;
  47         char *name = obddev->obd_type->typ_name;
  48         char *mgmt_name = NULL;
  49         int rc = 0;
  50         struct obd_device *mgmt_obd;
  51         mgmtcli_register_for_events_t register_f;
  52         ENTRY;
  53
  54         /* In a more perfect world, we would hang a ptlrpc_client off of
  55          * obd_type and just use the values from there. */
  56         if (!strcmp(name, LUSTRE_OSC_NAME)) {
  57                 rq_portal = OST_REQUEST_PORTAL;
  58                 rp_portal = OSC_REPLY_PORTAL;
  59                 connect_op = OST_CONNECT;
  60         } else if (!strcmp(name, LUSTRE_MDC_NAME)) {
  61                 rq_portal = MDS_REQUEST_PORTAL;
  62                 rp_portal = MDC_REPLY_PORTAL;
  63                 connect_op = MDS_CONNECT;
  64         } else if (!strcmp(name, LUSTRE_MGMTCLI_NAME)) {
  65                 rq_portal = MGMT_REQUEST_PORTAL;
  66                 rp_portal = MGMT_REPLY_PORTAL;
  67                 connect_op = MGMT_CONNECT;
  68         } else {
  69                 CERROR("unknown client OBD type \"%s\", can't setup\n",
  70                        name);
  71                 RETURN(-EINVAL);
  72         }
  73
  74         if (lcfg->lcfg_inllen1 < 1) {
  75                 CERROR("requires a TARGET UUID\n");
  76                 RETURN(-EINVAL);
  77         }
  78
  79         if (lcfg->lcfg_inllen1 > 37) {
  80                 CERROR("client UUID must be less than 38 characters\n");
  81                 RETURN(-EINVAL);
  82         }
  83
  84         if (lcfg->lcfg_inllen2 < 1) {
  85                 CERROR("setup requires a SERVER UUID\n");
  86                 RETURN(-EINVAL);
  87         }
  88
  89         if (lcfg->lcfg_inllen2 > 37) {
  90                 CERROR("target UUID must be less than 38 characters\n");
  91                 RETURN(-EINVAL);
  92         }
  93
  94         sema_init(&cli->cl_sem, 1);
  95         cli->cl_conn_count = 0;
  96         memcpy(server_uuid.uuid, lcfg->lcfg_inlbuf2,
  97                min_t(unsigned int, lcfg->lcfg_inllen2, sizeof(server_uuid)));
  98
  99         cli->cl_dirty = 0;
 100         cli->cl_avail_grant = 0;
 101         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 102         INIT_LIST_HEAD(&cli->cl_cache_waiters);
 103         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 104         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 105         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 106         spin_lock_init(&cli->cl_loi_list_lock);
 107         cli->cl_brw_in_flight = 0;
 108         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 109         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 110         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 111         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 112         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 113         cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 114
 115         ldlm_get_ref();
 116         if (rc) {
 117                 CERROR("ldlm_get_ref failed: %d\n", rc);
 118                 GOTO(err, rc);
 119         }
 120
 121         conn = ptlrpc_uuid_to_connection(&server_uuid);
 122         if (conn == NULL)
 123                 GOTO(err_ldlm, rc = -ENOENT);
 124
 125         ptlrpc_init_client(rq_portal, rp_portal, name,
 126                            &obddev->obd_ldlm_client);
 127
 128         imp = class_new_import();
 129         if (imp == NULL) {
 130                 ptlrpc_put_connection(conn);
 131                 GOTO(err_ldlm, rc = -ENOENT);
 132         }
 133         imp->imp_connection = conn;
 134         imp->imp_client = &obddev->obd_ldlm_client;
 135         imp->imp_obd = obddev;
 136         imp->imp_connect_op = connect_op;
 137         imp->imp_generation = 0;
 138         imp->imp_initial_recov = 1;
 139         INIT_LIST_HEAD(&imp->imp_pinger_chain);
 140         memcpy(imp->imp_target_uuid.uuid, lcfg->lcfg_inlbuf1,
 141               lcfg->lcfg_inllen1);
 142         class_import_put(imp);
 143
 144         cli->cl_import = imp;
 145         cli->cl_max_mds_easize = sizeof(struct lov_mds_md);
 146         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 147         cli->cl_sandev = to_kdev_t(0);
 148
 149         if (lcfg->lcfg_inllen3 != 0) {
 150                 if (!strcmp(lcfg->lcfg_inlbuf3, "inactive")) {
 151                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 152                                name, obddev->obd_name,
 153                                imp->imp_target_uuid.uuid);
 154                         imp->imp_invalid = 1;
 155
 156                         if (lcfg->lcfg_inllen4 != 0)
 157                                 mgmt_name = lcfg->lcfg_inlbuf4;
 158                 } else {
 159                         mgmt_name = lcfg->lcfg_inlbuf3;
 160                 }
 161         }
 162
 163         if (mgmt_name != NULL) {
 164                 /* Register with management client if we need to. */
 165                 CDEBUG(D_HA, "%s registering with %s for events about %s\n",
 166                        obddev->obd_name, mgmt_name, server_uuid.uuid);
 167
 168                 mgmt_obd = class_name2obd(mgmt_name);
 169                 if (!mgmt_obd) {
 170                         CERROR("can't find mgmtcli %s to register\n",
 171                                mgmt_name);
 172                         GOTO(err_import, rc = -ENOSYS);
 173                 }
 174
 175                 register_f = inter_module_get("mgmtcli_register_for_events");
 176                 if (!register_f) {
 177                         CERROR("can't i_m_g mgmtcli_register_for_events\n");
 178                         GOTO(err_import, rc = -ENOSYS);
 179                 }
 180
 181                 rc = register_f(mgmt_obd, obddev, &imp->imp_target_uuid);
 182                 inter_module_put("mgmtcli_register_for_events");
 183
 184                 if (!rc)
 185                         cli->cl_mgmtcli_obd = mgmt_obd;
 186         }
 187
 188         RETURN(rc);
 189
 190 err_import:
 191         class_destroy_import(imp);
 192 err_ldlm:
 193         ldlm_put_ref(0);
 194 err:
 195         RETURN(rc);
 196
 197 }
 198
 199 int client_obd_cleanup(struct obd_device *obddev, int flags)
 200 {
 201         struct client_obd *cli = &obddev->u.cli;
 202
 203         if (!cli->cl_import)
 204                 RETURN(-EINVAL);
 205         if (cli->cl_mgmtcli_obd) {
 206                 mgmtcli_deregister_for_events_t dereg_f;
 207
 208                 dereg_f = inter_module_get("mgmtcli_deregister_for_events");
 209                 dereg_f(cli->cl_mgmtcli_obd, obddev);
 210                 inter_module_put("mgmtcli_deregister_for_events");
 211         }
 212         class_destroy_import(cli->cl_import);
 213         cli->cl_import = NULL;
 214
 215         ldlm_put_ref(flags & OBD_OPT_FORCE);
 216
 217         RETURN(0);
 218 }
 219
 220 int client_connect_import(struct lustre_handle *dlm_handle,
 221                           struct obd_device *obd,
 222                           struct obd_uuid *cluuid)
 223 {
 224         struct client_obd *cli = &obd->u.cli;
 225         struct obd_import *imp = cli->cl_import;
 226         struct obd_export *exp;
 227         int rc;
 228         ENTRY;
 229
 230         down(&cli->cl_sem);
 231         rc = class_connect(dlm_handle, obd, cluuid);
 232         if (rc)
 233                 GOTO(out_sem, rc);
 234
 235         cli->cl_conn_count++;
 236         if (cli->cl_conn_count > 1)
 237                 GOTO(out_sem, rc);
 238         exp = class_conn2export(dlm_handle);
 239
 240         if (obd->obd_namespace != NULL)
 241                 CERROR("already have namespace!\n");
 242         obd->obd_namespace = ldlm_namespace_new(obd->obd_name,
 243                                                 LDLM_NAMESPACE_CLIENT);
 244         if (obd->obd_namespace == NULL)
 245                 GOTO(out_disco, rc = -ENOMEM);
 246
 247         imp->imp_dlm_handle = *dlm_handle;
 248         rc = ptlrpc_init_import(imp);
 249         if (rc != 0)
 250                 GOTO(out_ldlm, rc);
 251
 252         exp->exp_connection = ptlrpc_connection_addref(imp->imp_connection);
 253         rc = ptlrpc_connect_import(imp, NULL);
 254         if (rc != 0) {
 255                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 256                 GOTO(out_ldlm, rc);
 257         }
 258
 259         ptlrpc_pinger_add_import(imp);
 260         EXIT;
 261
 262         if (rc) {
 263 out_ldlm:
 264                 ldlm_namespace_free(obd->obd_namespace, 0);
 265                 obd->obd_namespace = NULL;
 266 out_disco:
 267                 cli->cl_conn_count--;
 268                 class_disconnect(exp, 0);
 269         } else {
 270                 class_export_put(exp);
 271         }
 272 out_sem:
 273         up(&cli->cl_sem);
 274         return rc;
 275 }
 276
 277 int client_disconnect_export(struct obd_export *exp, int failover)
 278 {
 279         struct obd_device *obd = class_exp2obd(exp);
 280         struct client_obd *cli = &obd->u.cli;
 281         struct obd_import *imp = cli->cl_import;
 282         int rc = 0, err;
 283         ENTRY;
 284
 285         if (!obd) {
 286                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 287                        exp, exp ? exp->exp_handle.h_cookie : -1);
 288                 RETURN(-EINVAL);
 289         }
 290
 291         down(&cli->cl_sem);
 292         if (!cli->cl_conn_count) {
 293                 CERROR("disconnecting disconnected device (%s)\n",
 294                        obd->obd_name);
 295                 GOTO(out_sem, rc = -EINVAL);
 296         }
 297
 298         cli->cl_conn_count--;
 299         if (cli->cl_conn_count)
 300                 GOTO(out_no_disconnect, rc = 0);
 301
 302         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 303          * delete it regardless.  (It's safe to delete an import that was
 304          * never added.) */
 305         (void)ptlrpc_pinger_del_import(imp);
 306
 307         if (obd->obd_namespace != NULL) {
 308                 /* obd_no_recov == local only */
 309                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 310                                        obd->obd_no_recov, NULL);
 311                 ldlm_namespace_free(obd->obd_namespace, obd->obd_no_recov);
 312                 obd->obd_namespace = NULL;
 313         }
 314
 315         /* Yeah, obd_no_recov also (mainly) means "forced shutdown". */
 316         if (obd->obd_no_recov)
 317                 ptlrpc_invalidate_import(imp, 0);
 318         else
 319                 rc = ptlrpc_disconnect_import(imp);
 320
 321         EXIT;
 322  out_no_disconnect:
 323         err = class_disconnect(exp, 0);
 324         if (!rc && err)
 325                 rc = err;
 326  out_sem:
 327         up(&cli->cl_sem);
 328         RETURN(rc);
 329 }
 330
 331 /* --------------------------------------------------------------------------
 332  * from old lib/target.c
 333  * -------------------------------------------------------------------------- */
 334
 335 int target_handle_reconnect(struct lustre_handle *conn, struct obd_export *exp,
 336                             struct obd_uuid *cluuid)
 337 {
 338         if (exp->exp_connection) {
 339                 struct lustre_handle *hdl;
 340                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 341                 /* Might be a re-connect after a partition. */
 342                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 343                         CERROR("%s reconnecting\n", cluuid->uuid);
 344                         conn->cookie = exp->exp_handle.h_cookie;
 345                         RETURN(EALREADY);
 346                 } else {
 347                         CERROR("%s reconnecting from %s, "
 348                                "handle mismatch (ours "LPX64", theirs "
 349                                LPX64")\n", cluuid->uuid,
 350                                exp->exp_connection->c_remote_uuid.uuid,
 351                                hdl->cookie, conn->cookie);
 352                         memset(conn, 0, sizeof *conn);
 353                         RETURN(-EALREADY);
 354                 }
 355         }
 356
 357         conn->cookie = exp->exp_handle.h_cookie;
 358         CDEBUG(D_INFO, "existing export for UUID '%s' at %p\n",
 359                cluuid->uuid, exp);
 360         CDEBUG(D_IOCTL,"connect: cookie "LPX64"\n", conn->cookie);
 361         RETURN(0);
 362 }
 363
 364 int target_handle_connect(struct ptlrpc_request *req, svc_handler_t handler)
 365 {
 366         struct obd_device *target;
 367         struct obd_export *export = NULL;
 368         struct obd_import *revimp;
 369         struct lustre_handle conn;
 370         struct obd_uuid tgtuuid;
 371         struct obd_uuid cluuid;
 372         struct obd_uuid remote_uuid;
 373         struct list_head *p;
 374         char *str, *tmp;
 375         int rc = 0, abort_recovery;
 376         unsigned long flags;
 377         ENTRY;
 378
 379         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 380
 381         LASSERT_REQSWAB (req, 0);
 382         str = lustre_msg_string(req->rq_reqmsg, 0, sizeof(tgtuuid) - 1);
 383         if (str == NULL) {
 384                 CERROR("bad target UUID for connect\n");
 385                 GOTO(out, rc = -EINVAL);
 386         }
 387
 388         obd_str2uuid (&tgtuuid, str);
 389         target = class_uuid2obd(&tgtuuid);
 390         if (!target) {
 391                 target = class_name2obd(str);
 392         }
 393
 394         if (!target || target->obd_stopping || !target->obd_set_up) {
 395                 CERROR("UUID '%s' is not available for connect\n", str);
 396                 GOTO(out, rc = -ENODEV);
 397         }
 398
 399         LASSERT_REQSWAB (req, 1);
 400         str = lustre_msg_string(req->rq_reqmsg, 1, sizeof(cluuid) - 1);
 401         if (str == NULL) {
 402                 CERROR("bad client UUID for connect\n");
 403                 GOTO(out, rc = -EINVAL);
 404         }
 405
 406         obd_str2uuid (&cluuid, str);
 407
 408         /* XXX extract a nettype and format accordingly */
 409         switch (sizeof(ptl_nid_t)) {
 410                 /* NB the casts only avoid compiler warnings */
 411         case 8:
 412                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 413                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.peer_nid);
 414                 break;
 415         case 4:
 416                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 417                          "NET_%x_UUID", (__u32)req->rq_peer.peer_nid);
 418                 break;
 419         default:
 420                 LBUG();
 421         }
 422
 423         spin_lock_bh(&target->obd_processing_task_lock);
 424         abort_recovery = target->obd_abort_recovery;
 425         spin_unlock_bh(&target->obd_processing_task_lock);
 426         if (abort_recovery)
 427                 target_abort_recovery(target);
 428
 429         tmp = lustre_msg_buf(req->rq_reqmsg, 2, sizeof conn);
 430         if (tmp == NULL)
 431                 GOTO(out, rc = -EPROTO);
 432
 433         memcpy(&conn, tmp, sizeof conn);
 434
 435         rc = lustre_pack_reply(req, 0, NULL, NULL);
 436         if (rc)
 437                 GOTO(out, rc);
 438
 439         /* lctl gets a backstage, all-access pass. */
 440         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 441                 goto dont_check_exports;
 442
 443         spin_lock(&target->obd_dev_lock);
 444         list_for_each(p, &target->obd_exports) {
 445                 export = list_entry(p, struct obd_export, exp_obd_chain);
 446                 if (obd_uuid_equals(&cluuid, &export->exp_client_uuid)) {
 447                         spin_unlock(&target->obd_dev_lock);
 448                         LASSERT(export->exp_obd == target);
 449
 450                         rc = target_handle_reconnect(&conn, export, &cluuid);
 451                         break;
 452                 }
 453                 export = NULL;
 454         }
 455         /* If we found an export, we already unlocked. */
 456         if (!export) {
 457                 spin_unlock(&target->obd_dev_lock);
 458         } else if (req->rq_reqmsg->conn_cnt == 1) {
 459                 CERROR("%s reconnected with 1 conn_cnt; cookies not random?\n",
 460                        cluuid.uuid);
 461                 GOTO(out, rc = -EALREADY);
 462         }
 463
 464         /* Tell the client if we're in recovery. */
 465         /* If this is the first client, start the recovery timer */
 466         if (target->obd_recovering) {
 467                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 468                 target_start_recovery_timer(target, handler);
 469         }
 470
 471         /* Tell the client if we support replayable requests */
 472         if (target->obd_replayable)
 473                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 474
 475         if (export == NULL) {
 476                 if (target->obd_recovering) {
 477                         CERROR("denying connection for new client %s: "
 478                                "%d clients in recovery for %lds\n", cluuid.uuid,
 479                                target->obd_recoverable_clients,
 480                                (target->obd_recovery_timer.expires-jiffies)/HZ);
 481                         rc = -EBUSY;
 482                 } else {
 483  dont_check_exports:
 484                         rc = obd_connect(&conn, target, &cluuid);
 485                 }
 486         }
 487
 488
 489         /* If all else goes well, this is our RPC return code. */
 490         req->rq_status = 0;
 491
 492         if (rc && rc != EALREADY)
 493                 GOTO(out, rc);
 494
 495         /* XXX track this all the time? */
 496         if (target->obd_recovering) {
 497                 target->obd_connected_clients++;
 498         }
 499
 500         req->rq_repmsg->handle = conn;
 501
 502         /* If the client and the server are the same node, we will already
 503          * have an export that really points to the client's DLM export,
 504          * because we have a shared handles table.
 505          *
 506          * XXX this will go away when shaver stops sending the "connect" handle
 507          * in the real "remote handle" field of the request --phik 24 Apr 2003
 508          */
 509         if (req->rq_export != NULL)
 510                 class_export_put(req->rq_export);
 511
 512         /* ownership of this export ref transfers to the request */
 513         export = req->rq_export = class_conn2export(&conn);
 514         LASSERT(export != NULL);
 515
 516         spin_lock_irqsave(&export->exp_lock, flags);
 517         if (export->exp_conn_cnt >= req->rq_reqmsg->conn_cnt) {
 518                 CERROR("%s: already connected at a higher conn_cnt: %d > %d\n",
 519                        cluuid.uuid, export->exp_conn_cnt,
 520                        req->rq_reqmsg->conn_cnt);
 521                 spin_unlock_irqrestore(&export->exp_lock, flags);
 522                 GOTO(out, rc = -EALREADY);
 523         }
 524         export->exp_conn_cnt = req->rq_reqmsg->conn_cnt;
 525         spin_unlock_irqrestore(&export->exp_lock, flags);
 526
 527         /* request from liblustre? */
 528         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT)
 529                 export->exp_libclient = 1;
 530
 531         if (export->exp_connection != NULL)
 532                 ptlrpc_put_connection(export->exp_connection);
 533         export->exp_connection = ptlrpc_get_connection(&req->rq_peer,
 534                                                        &remote_uuid);
 535
 536         if (rc == EALREADY) {
 537                 /* We indicate the reconnection in a flag, not an error code. */
 538                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 539                 GOTO(out, rc = 0);
 540         }
 541
 542         memcpy(&conn, lustre_msg_buf(req->rq_reqmsg, 2, sizeof conn),
 543                sizeof conn);
 544
 545         if (export->exp_imp_reverse != NULL)
 546                 class_destroy_import(export->exp_imp_reverse);
 547         revimp = export->exp_imp_reverse = class_new_import();
 548         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
 549         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
 550         revimp->imp_remote_handle = conn;
 551         revimp->imp_obd = target;
 552         revimp->imp_dlm_fake = 1;
 553         revimp->imp_state = LUSTRE_IMP_FULL;
 554         class_import_put(revimp);
 555 out:
 556         if (rc)
 557                 req->rq_status = rc;
 558         RETURN(rc);
 559 }
 560
 561 int target_handle_disconnect(struct ptlrpc_request *req)
 562 {
 563         struct obd_export *exp;
 564         int rc;
 565         ENTRY;
 566
 567         rc = lustre_pack_reply(req, 0, NULL, NULL);
 568         if (rc)
 569                 RETURN(rc);
 570
 571         /* keep the rq_export around so we can send the reply */
 572         exp = class_export_get(req->rq_export);
 573         req->rq_status = obd_disconnect(exp, 0);
 574         RETURN(0);
 575 }
 576
 577 void target_destroy_export(struct obd_export *exp)
 578 {
 579         /* exports created from last_rcvd data, and "fake"
 580            exports created by lctl don't have an import */
 581         if (exp->exp_imp_reverse != NULL)
 582                 class_destroy_import(exp->exp_imp_reverse);
 583
 584         /* We cancel locks at disconnect time, but this will catch any locks
 585          * granted in a race with recovery-induced disconnect. */
 586         if (exp->exp_obd->obd_namespace != NULL)
 587                 ldlm_cancel_locks_for_export(exp);
 588 }
 589
 590 /*
 591  * Recovery functions
 592  */
 593
 594 static void abort_delayed_replies(struct obd_device *obd)
 595 {
 596         struct ptlrpc_request *req;
 597         struct list_head *tmp, *n;
 598         list_for_each_safe(tmp, n, &obd->obd_delayed_reply_queue) {
 599                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 600                 DEBUG_REQ(D_ERROR, req, "aborted:");
 601                 req->rq_status = -ENOTCONN;
 602                 req->rq_type = PTL_RPC_MSG_ERR;
 603                 ptlrpc_reply(req);
 604                 class_export_put(req->rq_export);
 605                 list_del(&req->rq_list);
 606                 OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 607                 OBD_FREE(req, sizeof *req);
 608         }
 609 }
 610
 611 static void abort_recovery_queue(struct obd_device *obd)
 612 {
 613         struct ptlrpc_request *req;
 614         struct list_head *tmp, *n;
 615         int rc;
 616
 617         list_for_each_safe(tmp, n, &obd->obd_recovery_queue) {
 618                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 619                 DEBUG_REQ(D_ERROR, req, "aborted:");
 620                 req->rq_status = -ENOTCONN;
 621                 req->rq_type = PTL_RPC_MSG_ERR;
 622                 rc = lustre_pack_reply(req, 0, NULL, NULL);
 623                 if (rc == 0) {
 624                         ptlrpc_reply(req);
 625                 } else {
 626                         DEBUG_REQ(D_ERROR, req,
 627                                   "packing failed for abort-reply; skipping");
 628                 }
 629                 list_del(&req->rq_list);
 630                 class_export_put(req->rq_export);
 631                 OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 632                 OBD_FREE(req, sizeof *req);
 633         }
 634 }
 635
 636 void target_abort_recovery(void *data)
 637 {
 638         struct obd_device *obd = data;
 639         int rc;
 640
 641         CERROR("disconnecting clients and aborting recovery\n");
 642         spin_lock_bh(&obd->obd_processing_task_lock);
 643         if (!obd->obd_recovering) {
 644                 spin_unlock_bh(&obd->obd_processing_task_lock);
 645                 EXIT;
 646                 return;
 647         }
 648
 649         obd->obd_recovering = obd->obd_abort_recovery = 0;
 650
 651         wake_up(&obd->obd_next_transno_waitq);
 652         target_cancel_recovery_timer(obd);
 653         spin_unlock_bh(&obd->obd_processing_task_lock);
 654
 655         class_disconnect_exports(obd, 0);
 656
 657         /* when recovery was aborted, cleanup orphans on mds and ost */
 658         if (OBT(obd) && OBP(obd, postrecov)) {
 659                 rc = OBP(obd, postrecov)(obd);
 660                 if (rc >= 0)
 661                         CWARN("Cleanup %d orphans after recovery was aborted\n", rc);
 662                 else
 663                         CERROR("postrecov failed %d\n", rc);
 664         }
 665
 666         abort_delayed_replies(obd);
 667         abort_recovery_queue(obd);
 668         ptlrpc_run_recovery_over_upcall(obd);
 669 }
 670
 671 static void target_recovery_expired(unsigned long castmeharder)
 672 {
 673         struct obd_device *obd = (struct obd_device *)castmeharder;
 674         CERROR("recovery timed out, aborting\n");
 675         spin_lock_bh(&obd->obd_processing_task_lock);
 676         obd->obd_abort_recovery = 1;
 677         wake_up(&obd->obd_next_transno_waitq);
 678         spin_unlock_bh(&obd->obd_processing_task_lock);
 679 }
 680
 681
 682 /* obd_processing_task_lock should be held */
 683 void target_cancel_recovery_timer(struct obd_device *obd)
 684 {
 685         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
 686         del_timer(&obd->obd_recovery_timer);
 687 }
 688
 689 static void reset_recovery_timer(struct obd_device *obd)
 690 {
 691         spin_lock_bh(&obd->obd_processing_task_lock);
 692         if (!obd->obd_recovering) {
 693                 spin_unlock_bh(&obd->obd_processing_task_lock);
 694                 return;
 695         }
 696         CDEBUG(D_HA, "timer will expire in %u seconds\n",
 697                OBD_RECOVERY_TIMEOUT / HZ);
 698         mod_timer(&obd->obd_recovery_timer, jiffies + OBD_RECOVERY_TIMEOUT);
 699         spin_unlock_bh(&obd->obd_processing_task_lock);
 700 }
 701
 702
 703 /* Only start it the first time called */
 704 void target_start_recovery_timer(struct obd_device *obd, svc_handler_t handler)
 705 {
 706         spin_lock_bh(&obd->obd_processing_task_lock);
 707         if (obd->obd_recovery_handler) {
 708                 spin_unlock_bh(&obd->obd_processing_task_lock);
 709                 return;
 710         }
 711         CWARN("%s: starting recovery timer (%us)\n", obd->obd_name,
 712                OBD_RECOVERY_TIMEOUT / HZ);
 713         obd->obd_recovery_handler = handler;
 714         obd->obd_recovery_timer.function = target_recovery_expired;
 715         obd->obd_recovery_timer.data = (unsigned long)obd;
 716         init_timer(&obd->obd_recovery_timer);
 717         spin_unlock_bh(&obd->obd_processing_task_lock);
 718
 719         reset_recovery_timer(obd);
 720 }
 721
 722 static int check_for_next_transno(struct obd_device *obd)
 723 {
 724         struct ptlrpc_request *req;
 725         int wake_up = 0, connected, completed, queue_len, max;
 726         __u64 next_transno, req_transno;
 727
 728         spin_lock_bh(&obd->obd_processing_task_lock);
 729         req = list_entry(obd->obd_recovery_queue.next,
 730                          struct ptlrpc_request, rq_list);
 731         max = obd->obd_max_recoverable_clients;
 732         req_transno = req->rq_reqmsg->transno;
 733         connected = obd->obd_connected_clients;
 734         completed = max - obd->obd_recoverable_clients;
 735         queue_len = obd->obd_requests_queued_for_recovery;
 736         next_transno = obd->obd_next_recovery_transno;
 737
 738         if (obd->obd_abort_recovery) {
 739                 CDEBUG(D_HA, "waking for aborted recovery\n");
 740                 wake_up = 1;
 741         } else if (!obd->obd_recovering) {
 742                 CDEBUG(D_HA, "waking for completed recovery (?)\n");
 743                 wake_up = 1;
 744         } else if (req_transno == next_transno) {
 745                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
 746                 wake_up = 1;
 747         } else if (queue_len + completed == max) {
 748                 CDEBUG(D_ERROR,
 749                        "waking for skipped transno (skip: "LPD64
 750                        ", ql: %d, comp: %d, conn: %d, next: "LPD64")\n",
 751                        next_transno, queue_len, completed, max, req_transno);
 752                 obd->obd_next_recovery_transno = req_transno;
 753                 wake_up = 1;
 754         }
 755         spin_unlock_bh(&obd->obd_processing_task_lock);
 756         LASSERT(req->rq_reqmsg->transno >= next_transno);
 757         return wake_up;
 758 }
 759
 760 static void process_recovery_queue(struct obd_device *obd)
 761 {
 762         struct ptlrpc_request *req;
 763         int abort_recovery = 0;
 764         struct l_wait_info lwi = { 0 };
 765         ENTRY;
 766
 767         for (;;) {
 768                 spin_lock_bh(&obd->obd_processing_task_lock);
 769                 LASSERT(obd->obd_processing_task == current->pid);
 770                 req = list_entry(obd->obd_recovery_queue.next,
 771                                  struct ptlrpc_request, rq_list);
 772
 773                 if (req->rq_reqmsg->transno != obd->obd_next_recovery_transno) {
 774                         spin_unlock_bh(&obd->obd_processing_task_lock);
 775                         CDEBUG(D_HA, "Waiting for transno "LPD64" (1st is "
 776                                LPD64")\n",
 777                                obd->obd_next_recovery_transno,
 778                                req->rq_reqmsg->transno);
 779                         l_wait_event(obd->obd_next_transno_waitq,
 780                                      check_for_next_transno(obd), &lwi);
 781                         spin_lock_bh(&obd->obd_processing_task_lock);
 782                         abort_recovery = obd->obd_abort_recovery;
 783                         spin_unlock_bh(&obd->obd_processing_task_lock);
 784                         if (abort_recovery) {
 785                                 target_abort_recovery(obd);
 786                                 return;
 787                         }
 788                         continue;
 789                 }
 790                 list_del_init(&req->rq_list);
 791                 obd->obd_requests_queued_for_recovery--;
 792                 spin_unlock_bh(&obd->obd_processing_task_lock);
 793
 794                 DEBUG_REQ(D_HA, req, "processing: ");
 795                 (void)obd->obd_recovery_handler(req);
 796                 obd->obd_replayed_requests++;
 797                 reset_recovery_timer(obd);
 798                 /* bug 1580: decide how to properly sync() in recovery */
 799                 //mds_fsync_super(mds->mds_sb);
 800                 class_export_put(req->rq_export);
 801                 OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 802                 OBD_FREE(req, sizeof *req);
 803                 spin_lock_bh(&obd->obd_processing_task_lock);
 804                 obd->obd_next_recovery_transno++;
 805                 if (list_empty(&obd->obd_recovery_queue)) {
 806                         obd->obd_processing_task = 0;
 807                         spin_unlock_bh(&obd->obd_processing_task_lock);
 808                         break;
 809                 }
 810                 spin_unlock_bh(&obd->obd_processing_task_lock);
 811         }
 812         EXIT;
 813 }
 814
 815 int target_queue_recovery_request(struct ptlrpc_request *req,
 816                                   struct obd_device *obd)
 817 {
 818         struct list_head *tmp;
 819         int inserted = 0;
 820         __u64 transno = req->rq_reqmsg->transno;
 821         struct ptlrpc_request *saved_req;
 822         struct lustre_msg *reqmsg;
 823
 824         /* CAVEAT EMPTOR: The incoming request message has been swabbed
 825          * (i.e. buflens etc are in my own byte order), but type-dependent
 826          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
 827
 828         if (!transno) {
 829                 INIT_LIST_HEAD(&req->rq_list);
 830                 DEBUG_REQ(D_HA, req, "not queueing");
 831                 return 1;
 832         }
 833
 834         /* XXX If I were a real man, these LBUGs would be sane cleanups. */
 835         /* XXX just like the request-dup code in queue_final_reply */
 836         OBD_ALLOC(saved_req, sizeof *saved_req);
 837         if (!saved_req)
 838                 LBUG();
 839         OBD_ALLOC(reqmsg, req->rq_reqlen);
 840         if (!reqmsg)
 841                 LBUG();
 842
 843         spin_lock_bh(&obd->obd_processing_task_lock);
 844
 845         /* If we're processing the queue, we want don't want to queue this
 846          * message.
 847          *
 848          * Also, if this request has a transno less than the one we're waiting
 849          * for, we should process it now.  It could (and currently always will)
 850          * be an open request for a descriptor that was opened some time ago.
 851          */
 852         if (obd->obd_processing_task == current->pid ||
 853             transno < obd->obd_next_recovery_transno) {
 854                 /* Processing the queue right now, don't re-add. */
 855                 LASSERT(list_empty(&req->rq_list));
 856                 spin_unlock_bh(&obd->obd_processing_task_lock);
 857                 OBD_FREE(reqmsg, req->rq_reqlen);
 858                 OBD_FREE(saved_req, sizeof *saved_req);
 859                 return 1;
 860         }
 861
 862         memcpy(saved_req, req, sizeof *req);
 863         memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
 864         req = saved_req;
 865         req->rq_reqmsg = reqmsg;
 866         class_export_get(req->rq_export);
 867         INIT_LIST_HEAD(&req->rq_list);
 868
 869         /* XXX O(n^2) */
 870         list_for_each(tmp, &obd->obd_recovery_queue) {
 871                 struct ptlrpc_request *reqiter =
 872                         list_entry(tmp, struct ptlrpc_request, rq_list);
 873
 874                 if (reqiter->rq_reqmsg->transno > transno) {
 875                         list_add_tail(&req->rq_list, &reqiter->rq_list);
 876                         inserted = 1;
 877                         break;
 878                 }
 879         }
 880
 881         if (!inserted) {
 882                 list_add_tail(&req->rq_list, &obd->obd_recovery_queue);
 883         }
 884
 885         obd->obd_requests_queued_for_recovery++;
 886
 887         if (obd->obd_processing_task != 0) {
 888                 /* Someone else is processing this queue, we'll leave it to
 889                  * them.
 890                  */
 891                 wake_up(&obd->obd_next_transno_waitq);
 892                 spin_unlock_bh(&obd->obd_processing_task_lock);
 893                 return 0;
 894         }
 895
 896         /* Nobody is processing, and we know there's (at least) one to process
 897          * now, so we'll do the honours.
 898          */
 899         obd->obd_processing_task = current->pid;
 900         spin_unlock_bh(&obd->obd_processing_task_lock);
 901
 902         process_recovery_queue(obd);
 903         return 0;
 904 }
 905
 906 struct obd_device * target_req2obd(struct ptlrpc_request *req)
 907 {
 908         return req->rq_export->exp_obd;
 909 }
 910
 911 int target_queue_final_reply(struct ptlrpc_request *req, int rc)
 912 {
 913         struct obd_device *obd = target_req2obd(req);
 914         struct ptlrpc_request *saved_req;
 915         struct lustre_msg *reqmsg;
 916         int recovery_done = 0;
 917         int rc2;
 918
 919         LASSERT ((rc == 0) == (req->rq_reply_state != NULL));
 920
 921         if (rc) {
 922                 /* Just like ptlrpc_error, but without the sending. */
 923                 rc = lustre_pack_reply(req, 0, NULL, NULL);
 924                 LASSERT(rc == 0); /* XXX handle this */
 925                 req->rq_type = PTL_RPC_MSG_ERR;
 926         }
 927
 928         LASSERT (!req->rq_reply_state->rs_difficult);
 929         LASSERT(list_empty(&req->rq_list));
 930         /* XXX a bit like the request-dup code in queue_recovery_request */
 931         OBD_ALLOC(saved_req, sizeof *saved_req);
 932         if (!saved_req)
 933                 LBUG();
 934         OBD_ALLOC(reqmsg, req->rq_reqlen);
 935         if (!reqmsg)
 936                 LBUG();
 937         memcpy(saved_req, req, sizeof *saved_req);
 938         memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
 939         /* the copied req takes over the reply state */
 940         req->rq_reply_state = NULL;
 941         req = saved_req;
 942         req->rq_reqmsg = reqmsg;
 943         class_export_get(req->rq_export);
 944         list_add(&req->rq_list, &obd->obd_delayed_reply_queue);
 945
 946         spin_lock_bh(&obd->obd_processing_task_lock);
 947         --obd->obd_recoverable_clients;
 948         recovery_done = (obd->obd_recoverable_clients == 0);
 949         spin_unlock_bh(&obd->obd_processing_task_lock);
 950
 951         if (recovery_done) {
 952                 struct list_head *tmp, *n;
 953                 ldlm_reprocess_all_ns(req->rq_export->exp_obd->obd_namespace);
 954                 CWARN("%s: all clients recovered, sending delayed replies\n",
 955                        obd->obd_name);
 956                 spin_lock_bh(&obd->obd_processing_task_lock);
 957                 obd->obd_recovering = 0;
 958                 target_cancel_recovery_timer(obd);
 959                 spin_unlock_bh(&obd->obd_processing_task_lock);
 960
 961                 /* when recovery finished, cleanup orphans on mds and ost */
 962                 if (OBT(obd) && OBP(obd, postrecov)) {
 963                         rc2 = OBP(obd, postrecov)(obd);
 964                         if (rc2 >= 0)
 965                                 CWARN("%s: all clients recovered, %d MDS "
 966                                       "orphans deleted\n", obd->obd_name, rc2);
 967                         else
 968                                 CERROR("postrecov failed %d\n", rc2);
 969                 }
 970
 971                 list_for_each_safe(tmp, n, &obd->obd_delayed_reply_queue) {
 972                         req = list_entry(tmp, struct ptlrpc_request, rq_list);
 973                         DEBUG_REQ(D_ERROR, req, "delayed:");
 974                         ptlrpc_reply(req);
 975                         class_export_put(req->rq_export);
 976                         list_del(&req->rq_list);
 977                         OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 978                         OBD_FREE(req, sizeof *req);
 979                 }
 980                 ptlrpc_run_recovery_over_upcall(obd);
 981         } else {
 982                 CWARN("%s: %d recoverable clients remain\n",
 983                        obd->obd_name, obd->obd_recoverable_clients);
 984                 wake_up(&obd->obd_next_transno_waitq);
 985         }
 986
 987         return 1;
 988 }
 989
 990 int
 991 target_send_reply_msg (struct ptlrpc_request *req, int rc, int fail_id)
 992 {
 993         if (OBD_FAIL_CHECK(fail_id | OBD_FAIL_ONCE)) {
 994                 obd_fail_loc |= OBD_FAIL_ONCE | OBD_FAILED;
 995                 DEBUG_REQ(D_ERROR, req, "dropping reply");
 996                 /* NB this does _not_ send with ACK disabled, to simulate
 997                  * sending OK, but timing out for the ACK */
 998                 if (req->rq_reply_state != NULL) {
 999                         if (!req->rq_reply_state->rs_difficult) {
1000                                 lustre_free_reply_state (req->rq_reply_state);
1001                                 req->rq_reply_state = NULL;
1002                         } else {
1003                                 struct ptlrpc_service *svc =
1004                                         req->rq_rqbd->rqbd_srv_ni->sni_service;
1005                                 atomic_inc(&svc->srv_outstanding_replies);
1006                         }
1007                 }
1008                 return (-ECOMM);
1009         }
1010
1011         if (rc) {
1012                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
1013                 if (req->rq_reply_state == NULL) {
1014                         rc = lustre_pack_reply (req, 0, NULL, NULL);
1015                         if (rc != 0) {
1016                                 CERROR ("can't allocate reply\n");
1017                                 return (rc);
1018                         }
1019                 }
1020                 req->rq_type = PTL_RPC_MSG_ERR;
1021         } else {
1022                 DEBUG_REQ(D_NET, req, "sending reply");
1023         }
1024
1025         return (ptlrpc_send_reply(req, 1));
1026 }
1027
1028 void
1029 target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
1030 {
1031         int                        netrc;
1032         unsigned long              flags;
1033         struct ptlrpc_reply_state *rs;
1034         struct obd_device         *obd;
1035         struct obd_export         *exp;
1036         struct ptlrpc_srv_ni      *sni;
1037         struct ptlrpc_service     *svc;
1038
1039         sni = req->rq_rqbd->rqbd_srv_ni;
1040         svc = sni->sni_service;
1041
1042         rs = req->rq_reply_state;
1043         if (rs == NULL || !rs->rs_difficult) {
1044                 /* The easy case; no notifiers and reply_out_callback()
1045                  * cleans up (i.e. we can't look inside rs after a
1046                  * successful send) */
1047                 netrc = target_send_reply_msg (req, rc, fail_id);
1048
1049                 LASSERT (netrc == 0 || req->rq_reply_state == NULL);
1050                 return;
1051         }
1052
1053         /* must be an export if locks saved */
1054         LASSERT (req->rq_export != NULL);
1055         /* req/reply consistent */
1056         LASSERT (rs->rs_srv_ni == sni);
1057
1058         /* "fresh" reply */
1059         LASSERT (!rs->rs_scheduled);
1060         LASSERT (!rs->rs_scheduled_ever);
1061         LASSERT (!rs->rs_handled);
1062         LASSERT (!rs->rs_on_net);
1063         LASSERT (rs->rs_export == NULL);
1064         LASSERT (list_empty(&rs->rs_obd_list));
1065         LASSERT (list_empty(&rs->rs_exp_list));
1066
1067         exp = class_export_get (req->rq_export);
1068         obd = exp->exp_obd;
1069
1070         /* disable reply scheduling onto srv_reply_queue while I'm setting up */
1071         rs->rs_scheduled = 1;
1072         rs->rs_on_net    = 1;
1073         rs->rs_xid       = req->rq_xid;
1074         rs->rs_transno   = req->rq_transno;
1075         rs->rs_export    = exp;
1076
1077         spin_lock_irqsave (&obd->obd_uncommitted_replies_lock, flags);
1078
1079         if (rs->rs_transno > obd->obd_last_committed) {
1080                 /* not committed already */
1081                 list_add_tail (&rs->rs_obd_list,
1082                                &obd->obd_uncommitted_replies);
1083         }
1084
1085         spin_unlock (&obd->obd_uncommitted_replies_lock);
1086         spin_lock (&exp->exp_lock);
1087
1088         list_add_tail (&rs->rs_exp_list, &exp->exp_outstanding_replies);
1089
1090         spin_unlock_irqrestore (&exp->exp_lock, flags);
1091
1092         netrc = target_send_reply_msg (req, rc, fail_id);
1093
1094         spin_lock_irqsave (&svc->srv_lock, flags);
1095
1096         svc->srv_n_difficult_replies++;
1097
1098         if (netrc != 0) /* error sending: reply is off the net */
1099                 rs->rs_on_net = 0;
1100
1101         if (!rs->rs_on_net ||                   /* some notifier */
1102             list_empty(&rs->rs_exp_list) ||     /* completed already */
1103             list_empty(&rs->rs_obd_list)) {
1104                 list_add_tail (&rs->rs_list, &svc->srv_reply_queue);
1105                 wake_up (&svc->srv_waitq);
1106         } else {
1107                 list_add (&rs->rs_list, &sni->sni_active_replies);
1108                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
1109         }
1110
1111         spin_unlock_irqrestore (&svc->srv_lock, flags);
1112 }
1113
1114 int target_handle_ping(struct ptlrpc_request *req)
1115 {
1116         return lustre_pack_reply(req, 0, NULL, NULL);
1117 }