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, MIN(lcfg->lcfg_inllen2,
  97                                                         sizeof(server_uuid)));
  98
  99         init_MUTEX(&cli->cl_dirty_sem);
 100         cli->cl_dirty = 0;
 101         cli->cl_dirty_granted = 0;
 102         cli->cl_dirty_max = 64*1024*1024; /* some default */
 103         cli->cl_ost_can_grant = 1;
 104         INIT_LIST_HEAD(&cli->cl_cache_waiters);
 105         INIT_LIST_HEAD(&cli->cl_loi_ready_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 = PTL_MD_MAX_PAGES;
 113         cli->cl_max_rpcs_in_flight = 8;
 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         INIT_LIST_HEAD(&imp->imp_pinger_chain);
 139         memcpy(imp->imp_target_uuid.uuid, lcfg->lcfg_inlbuf1,
 140               lcfg->lcfg_inllen1);
 141         class_import_put(imp);
 142
 143         cli->cl_import = imp;
 144         cli->cl_max_mds_easize = sizeof(struct lov_mds_md);
 145         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 146         cli->cl_sandev = to_kdev_t(0);
 147
 148         if (lcfg->lcfg_inllen3 != 0) {
 149                 if (!strcmp(lcfg->lcfg_inlbuf3, "inactive")) {
 150                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 151                                name, obddev->obd_name,
 152                                imp->imp_target_uuid.uuid);
 153                         imp->imp_invalid = 1;
 154
 155                         if (lcfg->lcfg_inllen4 != 0)
 156                                 mgmt_name = lcfg->lcfg_inlbuf4;
 157                 } else {
 158                         mgmt_name = lcfg->lcfg_inlbuf3;
 159                 }
 160         }
 161
 162         if (mgmt_name != NULL) {
 163                 /* Register with management client if we need to. */
 164                 CDEBUG(D_HA, "%s registering with %s for events about %s\n",
 165                        obddev->obd_name, mgmt_name, server_uuid.uuid);
 166
 167                 mgmt_obd = class_name2obd(mgmt_name);
 168                 if (!mgmt_obd) {
 169                         CERROR("can't find mgmtcli %s to register\n",
 170                                mgmt_name);
 171                         GOTO(err_import, rc = -ENOSYS);
 172                 }
 173
 174                 register_f = inter_module_get("mgmtcli_register_for_events");
 175                 if (!register_f) {
 176                         CERROR("can't i_m_g mgmtcli_register_for_events\n");
 177                         GOTO(err_import, rc = -ENOSYS);
 178                 }
 179
 180                 rc = register_f(mgmt_obd, obddev, &imp->imp_target_uuid);
 181                 inter_module_put("mgmtcli_register_for_events");
 182
 183                 if (!rc)
 184                         cli->cl_mgmtcli_obd = mgmt_obd;
 185         }
 186
 187         RETURN(rc);
 188
 189 err_import:
 190         class_destroy_import(imp);
 191 err_ldlm:
 192         ldlm_put_ref(0);
 193 err:
 194         RETURN(rc);
 195
 196 }
 197
 198 int client_obd_cleanup(struct obd_device *obddev, int flags)
 199 {
 200         struct client_obd *cli = &obddev->u.cli;
 201
 202         if (!cli->cl_import)
 203                 RETURN(-EINVAL);
 204         if (cli->cl_mgmtcli_obd) {
 205                 mgmtcli_deregister_for_events_t dereg_f;
 206
 207                 dereg_f = inter_module_get("mgmtcli_deregister_for_events");
 208                 dereg_f(cli->cl_mgmtcli_obd, obddev);
 209                 inter_module_put("mgmtcli_deregister_for_events");
 210         }
 211         class_destroy_import(cli->cl_import);
 212         cli->cl_import = NULL;
 213
 214         ldlm_put_ref(flags & OBD_OPT_FORCE);
 215
 216         RETURN(0);
 217 }
 218
 219 int client_connect_import(struct lustre_handle *dlm_handle,
 220                           struct obd_device *obd,
 221                           struct obd_uuid *cluuid)
 222 {
 223         struct client_obd *cli = &obd->u.cli;
 224         struct obd_import *imp = cli->cl_import;
 225         struct obd_export *exp;
 226         int rc;
 227         ENTRY;
 228
 229         down(&cli->cl_sem);
 230         rc = class_connect(dlm_handle, obd, cluuid);
 231         if (rc)
 232                 GOTO(out_sem, rc);
 233
 234         cli->cl_conn_count++;
 235         if (cli->cl_conn_count > 1)
 236                 GOTO(out_sem, rc);
 237         exp = class_conn2export(dlm_handle);
 238
 239         if (obd->obd_namespace != NULL)
 240                 CERROR("already have namespace!\n");
 241         obd->obd_namespace = ldlm_namespace_new(obd->obd_name,
 242                                                 LDLM_NAMESPACE_CLIENT);
 243         if (obd->obd_namespace == NULL)
 244                 GOTO(out_disco, rc = -ENOMEM);
 245
 246         imp->imp_dlm_handle = *dlm_handle;
 247         imp->imp_state = LUSTRE_IMP_DISCON;
 248
 249         rc = ptlrpc_connect_import(imp);
 250         if (rc != 0) {
 251                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 252                 GOTO(out_ldlm, rc);
 253         }
 254
 255         LASSERT (imp->imp_state == LUSTRE_IMP_FULL);
 256
 257         exp->exp_connection = ptlrpc_connection_addref(imp->imp_connection);
 258
 259         if (imp->imp_replayable) {
 260                 CDEBUG(D_HA, "connected to replayable target: %s\n",
 261                        imp->imp_target_uuid.uuid);
 262                 ptlrpc_pinger_add_import(imp);
 263         }
 264
 265         CDEBUG(D_HA, "local import: %p, remote handle: "LPX64"\n", imp,
 266                imp->imp_remote_handle.cookie);
 267
 268         EXIT;
 269
 270         if (rc) {
 271 out_ldlm:
 272                 ldlm_namespace_free(obd->obd_namespace, 0);
 273                 obd->obd_namespace = NULL;
 274 out_disco:
 275                 cli->cl_conn_count--;
 276                 class_disconnect(exp, 0);
 277         } else {
 278                 class_export_put(exp);
 279         }
 280 out_sem:
 281         up(&cli->cl_sem);
 282         return rc;
 283 }
 284
 285 int client_disconnect_export(struct obd_export *exp, int failover)
 286 {
 287         struct obd_device *obd = class_exp2obd(exp);
 288         struct client_obd *cli = &obd->u.cli;
 289         struct obd_import *imp = cli->cl_import;
 290         int rc = 0, err;
 291         ENTRY;
 292
 293         if (!obd) {
 294                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 295                        exp, exp ? exp->exp_handle.h_cookie : -1);
 296                 RETURN(-EINVAL);
 297         }
 298
 299         down(&cli->cl_sem);
 300         if (!cli->cl_conn_count) {
 301                 CERROR("disconnecting disconnected device (%s)\n",
 302                        obd->obd_name);
 303                 GOTO(out_sem, rc = -EINVAL);
 304         }
 305
 306         cli->cl_conn_count--;
 307         if (cli->cl_conn_count)
 308                 GOTO(out_no_disconnect, rc = 0);
 309
 310         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 311          * delete it regardless.  (It's safe to delete an import that was
 312          * never added.) */
 313         (void)ptlrpc_pinger_del_import(imp);
 314
 315         if (obd->obd_namespace != NULL) {
 316                 /* obd_no_recov == local only */
 317                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 318                                        obd->obd_no_recov, NULL);
 319                 ldlm_namespace_free(obd->obd_namespace, obd->obd_no_recov);
 320                 obd->obd_namespace = NULL;
 321         }
 322
 323         /* Yeah, obd_no_recov also (mainly) means "forced shutdown". */
 324         if (obd->obd_no_recov)
 325                 ptlrpc_set_import_active(imp, 0);
 326         else
 327                 rc = ptlrpc_disconnect_import(imp);
 328
 329         imp->imp_state = LUSTRE_IMP_NEW;
 330
 331         EXIT;
 332  out_no_disconnect:
 333         err = class_disconnect(exp, 0);
 334         if (!rc && err)
 335                 rc = err;
 336  out_sem:
 337         up(&cli->cl_sem);
 338         RETURN(rc);
 339 }
 340
 341 /* --------------------------------------------------------------------------
 342  * from old lib/target.c
 343  * -------------------------------------------------------------------------- */
 344
 345 int target_handle_reconnect(struct lustre_handle *conn, struct obd_export *exp,
 346                             struct obd_uuid *cluuid)
 347 {
 348         if (exp->exp_connection) {
 349                 struct lustre_handle *hdl;
 350                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 351                 /* Might be a re-connect after a partition. */
 352                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 353                         CERROR("%s reconnecting\n", cluuid->uuid);
 354                         conn->cookie = exp->exp_handle.h_cookie;
 355                         RETURN(EALREADY);
 356                 } else {
 357                         CERROR("%s reconnecting from %s, "
 358                                "handle mismatch (ours "LPX64", theirs "
 359                                LPX64")\n", cluuid->uuid,
 360                                exp->exp_connection->c_remote_uuid.uuid,
 361                                hdl->cookie, conn->cookie);
 362                         memset(conn, 0, sizeof *conn);
 363                         RETURN(-EALREADY);
 364                 }
 365         }
 366
 367         conn->cookie = exp->exp_handle.h_cookie;
 368         CDEBUG(D_INFO, "existing export for UUID '%s' at %p\n",
 369                cluuid->uuid, exp);
 370         CDEBUG(D_IOCTL,"connect: cookie "LPX64"\n", conn->cookie);
 371         RETURN(0);
 372 }
 373
 374 int target_handle_connect(struct ptlrpc_request *req, svc_handler_t handler)
 375 {
 376         struct obd_device *target;
 377         struct obd_export *export = NULL;
 378         struct obd_import *revimp;
 379         struct lustre_handle conn;
 380         struct obd_uuid tgtuuid;
 381         struct obd_uuid cluuid;
 382         struct obd_uuid remote_uuid;
 383         struct list_head *p;
 384         char *str, *tmp;
 385         int rc = 0, abort_recovery;
 386         ENTRY;
 387
 388         LASSERT_REQSWAB (req, 0);
 389         str = lustre_msg_string(req->rq_reqmsg, 0, sizeof(tgtuuid) - 1);
 390         if (str == NULL) {
 391                 CERROR("bad target UUID for connect\n");
 392                 GOTO(out, rc = -EINVAL);
 393         }
 394
 395         obd_str2uuid (&tgtuuid, str);
 396         target = class_uuid2obd(&tgtuuid);
 397         if (!target) {
 398                 target = class_name2obd(str);
 399         }
 400
 401         if (!target || target->obd_stopping || !target->obd_set_up) {
 402                 CERROR("UUID '%s' is not available for connect\n", str);
 403                 GOTO(out, rc = -ENODEV);
 404         }
 405
 406         LASSERT_REQSWAB (req, 1);
 407         str = lustre_msg_string(req->rq_reqmsg, 1, sizeof(cluuid) - 1);
 408         if (str == NULL) {
 409                 CERROR("bad client UUID for connect\n");
 410                 GOTO(out, rc = -EINVAL);
 411         }
 412
 413         obd_str2uuid (&cluuid, str);
 414
 415         /* XXX extract a nettype and format accordingly */
 416         snprintf(remote_uuid.uuid, sizeof remote_uuid,
 417                  "NET_"LPX64"_UUID", req->rq_peer.peer_nid);
 418
 419         spin_lock_bh(&target->obd_processing_task_lock);
 420         abort_recovery = target->obd_abort_recovery;
 421         spin_unlock_bh(&target->obd_processing_task_lock);
 422         if (abort_recovery)
 423                 target_abort_recovery(target);
 424
 425         tmp = lustre_msg_buf(req->rq_reqmsg, 2, sizeof conn);
 426         if (tmp == NULL)
 427                 GOTO(out, rc = -EPROTO);
 428
 429         memcpy(&conn, tmp, sizeof conn);
 430
 431         rc = lustre_pack_reply(req, 0, NULL, NULL);
 432         if (rc)
 433                 GOTO(out, rc);
 434
 435         /* lctl gets a backstage, all-access pass. */
 436         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 437                 goto dont_check_exports;
 438
 439         spin_lock(&target->obd_dev_lock);
 440         list_for_each(p, &target->obd_exports) {
 441                 export = list_entry(p, struct obd_export, exp_obd_chain);
 442                 if (obd_uuid_equals(&cluuid, &export->exp_client_uuid)) {
 443                         spin_unlock(&target->obd_dev_lock);
 444                         LASSERT(export->exp_obd == target);
 445
 446                         rc = target_handle_reconnect(&conn, export, &cluuid);
 447                         break;
 448                 }
 449                 export = NULL;
 450         }
 451         /* If we found an export, we already unlocked. */
 452         if (!export) {
 453                 spin_unlock(&target->obd_dev_lock);
 454         } else if (req->rq_reqmsg->conn_cnt == 1) {
 455                 CERROR("%s reconnected with 1 conn_cnt; cookies not random?\n",
 456                        cluuid.uuid);
 457                 GOTO(out, rc = -EALREADY);
 458         }
 459
 460         /* Tell the client if we're in recovery. */
 461         /* If this is the first client, start the recovery timer */
 462         if (target->obd_recovering) {
 463                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 464                 target_start_recovery_timer(target, handler);
 465         }
 466
 467         /* Tell the client if we support replayable requests */
 468         if (target->obd_replayable)
 469                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 470
 471         if (export == NULL) {
 472                 if (target->obd_recovering) {
 473                         CERROR("denying connection for new client %s: "
 474                                "%d clients in recovery for %lds\n", cluuid.uuid,
 475                                target->obd_recoverable_clients,
 476                                (target->obd_recovery_timer.expires-jiffies)/HZ);
 477                         rc = -EBUSY;
 478                 } else {
 479  dont_check_exports:
 480                         rc = obd_connect(&conn, target, &cluuid);
 481                 }
 482         }
 483
 484         /* If all else goes well, this is our RPC return code. */
 485         req->rq_status = 0;
 486
 487         if (rc && rc != EALREADY)
 488                 GOTO(out, rc);
 489
 490         /* XXX track this all the time? */
 491         if (target->obd_recovering) {
 492                 target->obd_connected_clients++;
 493         }
 494
 495         req->rq_repmsg->handle = conn;
 496
 497         /* If the client and the server are the same node, we will already
 498          * have an export that really points to the client's DLM export,
 499          * because we have a shared handles table.
 500          *
 501          * XXX this will go away when shaver stops sending the "connect" handle
 502          * in the real "remote handle" field of the request --phik 24 Apr 2003
 503          */
 504         if (req->rq_export != NULL)
 505                 class_export_put(req->rq_export);
 506
 507         /* ownership of this export ref transfers to the request */
 508         export = req->rq_export = class_conn2export(&conn);
 509         LASSERT(export != NULL);
 510
 511         if (req->rq_connection != NULL)
 512                 ptlrpc_put_connection(req->rq_connection);
 513         if (export->exp_connection != NULL)
 514                 ptlrpc_put_connection(export->exp_connection);
 515         export->exp_connection = ptlrpc_get_connection(&req->rq_peer,
 516                                                        &remote_uuid);
 517         req->rq_connection = ptlrpc_connection_addref(export->exp_connection);
 518
 519         LASSERT(export->exp_conn_cnt < req->rq_reqmsg->conn_cnt);
 520         export->exp_conn_cnt = req->rq_reqmsg->conn_cnt;
 521
 522         if (rc == EALREADY) {
 523                 /* We indicate the reconnection in a flag, not an error code. */
 524                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 525                 GOTO(out, rc = 0);
 526         }
 527
 528         memcpy(&conn, lustre_msg_buf(req->rq_reqmsg, 2, sizeof conn),
 529                sizeof conn);
 530
 531         if (export->exp_imp_reverse != NULL)
 532                 class_destroy_import(export->exp_imp_reverse);
 533         revimp = export->exp_imp_reverse = class_new_import();
 534         revimp->imp_connection = ptlrpc_connection_addref(req->rq_connection);
 535         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
 536         revimp->imp_remote_handle = conn;
 537         revimp->imp_obd = target;
 538         revimp->imp_dlm_fake = 1;
 539         revimp->imp_state = LUSTRE_IMP_FULL;
 540         class_import_put(revimp);
 541 out:
 542         if (rc)
 543                 req->rq_status = rc;
 544         RETURN(rc);
 545 }
 546
 547 int target_handle_disconnect(struct ptlrpc_request *req)
 548 {
 549         int rc;
 550         ENTRY;
 551
 552         rc = lustre_pack_reply(req, 0, NULL, NULL);
 553         if (rc)
 554                 RETURN(rc);
 555
 556         req->rq_status = obd_disconnect(req->rq_export, 0);
 557         req->rq_export = NULL;
 558         RETURN(0);
 559 }
 560
 561 void target_destroy_export(struct obd_export *exp)
 562 {
 563         /* exports created from last_rcvd data, and "fake"
 564            exports created by lctl don't have an import */
 565         if (exp->exp_imp_reverse != NULL)
 566                 class_destroy_import(exp->exp_imp_reverse);
 567
 568         /* We cancel locks at disconnect time, but this will catch any locks
 569          * granted in a race with recovery-induced disconnect. */
 570         ldlm_cancel_locks_for_export(exp);
 571 }
 572
 573 /*
 574  * Recovery functions
 575  */
 576
 577 void target_cancel_recovery_timer(struct obd_device *obd)
 578 {
 579         del_timer(&obd->obd_recovery_timer);
 580 }
 581
 582 static void abort_delayed_replies(struct obd_device *obd)
 583 {
 584         struct ptlrpc_request *req;
 585         struct list_head *tmp, *n;
 586         list_for_each_safe(tmp, n, &obd->obd_delayed_reply_queue) {
 587                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 588                 DEBUG_REQ(D_ERROR, req, "aborted:");
 589                 req->rq_status = -ENOTCONN;
 590                 req->rq_type = PTL_RPC_MSG_ERR;
 591                 ptlrpc_reply(req);
 592                 list_del(&req->rq_list);
 593                 OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 594                 OBD_FREE(req, sizeof *req);
 595         }
 596 }
 597
 598 static void abort_recovery_queue(struct obd_device *obd)
 599 {
 600         struct ptlrpc_request *req;
 601         struct list_head *tmp, *n;
 602         int rc;
 603
 604         list_for_each_safe(tmp, n, &obd->obd_recovery_queue) {
 605                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 606                 DEBUG_REQ(D_ERROR, req, "aborted:");
 607                 req->rq_status = -ENOTCONN;
 608                 req->rq_type = PTL_RPC_MSG_ERR;
 609                 rc = lustre_pack_reply(req, 0, NULL, NULL);
 610                 if (rc == 0) {
 611                         ptlrpc_reply(req);
 612                 } else {
 613                         DEBUG_REQ(D_ERROR, req,
 614                                   "packing failed for abort-reply; skipping");
 615                 }
 616                 list_del(&req->rq_list);
 617                 class_export_put(req->rq_export);
 618                 OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 619                 OBD_FREE(req, sizeof *req);
 620         }
 621 }
 622
 623 void target_abort_recovery(void *data)
 624 {
 625         struct obd_device *obd = data;
 626         int rc;
 627
 628         CERROR("disconnecting clients and aborting recovery\n");
 629         spin_lock_bh(&obd->obd_processing_task_lock);
 630         if (!obd->obd_recovering) {
 631                 spin_unlock_bh(&obd->obd_processing_task_lock);
 632                 EXIT;
 633                 return;
 634         }
 635
 636         obd->obd_recovering = obd->obd_abort_recovery = 0;
 637
 638         wake_up(&obd->obd_next_transno_waitq);
 639         target_cancel_recovery_timer(obd);
 640         spin_unlock_bh(&obd->obd_processing_task_lock);
 641
 642         class_disconnect_exports(obd, 0);
 643
 644         /* when recovery was abort, cleanup orphans for mds */
 645         if (OBT(obd) && OBP(obd, postrecov)) {
 646                 rc = OBP(obd, postrecov)(obd);
 647                 if (rc >= 0)
 648                         CWARN("Cleanup %d orphans after recovery was aborted\n", rc);
 649                 else
 650                         CERROR("postrecov failed %d\n", rc);
 651         }
 652
 653         abort_delayed_replies(obd);
 654         abort_recovery_queue(obd);
 655         ptlrpc_run_recovery_over_upcall(obd);
 656 }
 657
 658 static void target_recovery_expired(unsigned long castmeharder)
 659 {
 660         struct obd_device *obd = (struct obd_device *)castmeharder;
 661         CERROR("recovery timed out, aborting\n");
 662         spin_lock_bh(&obd->obd_processing_task_lock);
 663         obd->obd_abort_recovery = 1;
 664         wake_up(&obd->obd_next_transno_waitq);
 665         spin_unlock_bh(&obd->obd_processing_task_lock);
 666 }
 667
 668 static void reset_recovery_timer(struct obd_device *obd)
 669 {
 670         int recovering;
 671         spin_lock(&obd->obd_dev_lock);
 672         recovering = obd->obd_recovering;
 673         spin_unlock(&obd->obd_dev_lock);
 674
 675         if (!recovering)
 676                 return;
 677         CDEBUG(D_HA, "timer will expire in %u seconds\n",
 678                OBD_RECOVERY_TIMEOUT / HZ);
 679         mod_timer(&obd->obd_recovery_timer, jiffies + OBD_RECOVERY_TIMEOUT);
 680 }
 681
 682
 683 /* Only start it the first time called */
 684 void target_start_recovery_timer(struct obd_device *obd, svc_handler_t handler)
 685 {
 686         spin_lock_bh(&obd->obd_processing_task_lock);
 687         if (obd->obd_recovery_handler) {
 688                 spin_unlock_bh(&obd->obd_processing_task_lock);
 689                 return;
 690         }
 691         CWARN("%s: starting recovery timer (%us)\n", obd->obd_name,
 692                OBD_RECOVERY_TIMEOUT / HZ);
 693         obd->obd_recovery_handler = handler;
 694         obd->obd_recovery_timer.function = target_recovery_expired;
 695         obd->obd_recovery_timer.data = (unsigned long)obd;
 696         init_timer(&obd->obd_recovery_timer);
 697         spin_unlock_bh(&obd->obd_processing_task_lock);
 698
 699         reset_recovery_timer(obd);
 700 }
 701
 702 static int check_for_next_transno(struct obd_device *obd)
 703 {
 704         struct ptlrpc_request *req;
 705         int wake_up = 0, connected, completed, queue_len, max;
 706         __u64 next_transno, req_transno;
 707
 708         spin_lock_bh(&obd->obd_processing_task_lock);
 709         req = list_entry(obd->obd_recovery_queue.next,
 710                          struct ptlrpc_request, rq_list);
 711         max = obd->obd_max_recoverable_clients;
 712         req_transno = req->rq_reqmsg->transno;
 713         connected = obd->obd_connected_clients;
 714         completed = max - obd->obd_recoverable_clients;
 715         queue_len = obd->obd_requests_queued_for_recovery;
 716         next_transno = obd->obd_next_recovery_transno;
 717
 718         if (obd->obd_abort_recovery) {
 719                 CDEBUG(D_HA, "waking for aborted recovery\n");
 720                 wake_up = 1;
 721         } else if (!obd->obd_recovering) {
 722                 CDEBUG(D_HA, "waking for completed recovery (?)\n");
 723                 wake_up = 1;
 724         } else if (req_transno == next_transno) {
 725                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
 726                 wake_up = 1;
 727         } else if (queue_len + completed == max) {
 728                 CDEBUG(D_ERROR,
 729                        "waking for skipped transno (skip: "LPD64
 730                        ", ql: %d, comp: %d, conn: %d, next: "LPD64")\n",
 731                        next_transno, queue_len, completed, max, req_transno);
 732                 obd->obd_next_recovery_transno = req_transno;
 733                 wake_up = 1;
 734         }
 735         spin_unlock_bh(&obd->obd_processing_task_lock);
 736         LASSERT(req->rq_reqmsg->transno >= next_transno);
 737         return wake_up;
 738 }
 739
 740 static void process_recovery_queue(struct obd_device *obd)
 741 {
 742         struct ptlrpc_request *req;
 743         int abort_recovery = 0;
 744         struct l_wait_info lwi = { 0 };
 745         ENTRY;
 746
 747         for (;;) {
 748                 spin_lock_bh(&obd->obd_processing_task_lock);
 749                 LASSERT(obd->obd_processing_task == current->pid);
 750                 req = list_entry(obd->obd_recovery_queue.next,
 751                                  struct ptlrpc_request, rq_list);
 752
 753                 if (req->rq_reqmsg->transno != obd->obd_next_recovery_transno) {
 754                         spin_unlock_bh(&obd->obd_processing_task_lock);
 755                         CDEBUG(D_HA, "Waiting for transno "LPD64" (1st is "
 756                                LPD64")\n",
 757                                obd->obd_next_recovery_transno,
 758                                req->rq_reqmsg->transno);
 759                         l_wait_event(obd->obd_next_transno_waitq,
 760                                      check_for_next_transno(obd), &lwi);
 761                         spin_lock_bh(&obd->obd_processing_task_lock);
 762                         abort_recovery = obd->obd_abort_recovery;
 763                         spin_unlock_bh(&obd->obd_processing_task_lock);
 764                         if (abort_recovery) {
 765                                 target_abort_recovery(obd);
 766                                 return;
 767                         }
 768                         continue;
 769                 }
 770                 list_del_init(&req->rq_list);
 771                 obd->obd_requests_queued_for_recovery--;
 772                 spin_unlock_bh(&obd->obd_processing_task_lock);
 773
 774                 DEBUG_REQ(D_HA, req, "processing: ");
 775                 (void)obd->obd_recovery_handler(req);
 776                 obd->obd_replayed_requests++;
 777                 reset_recovery_timer(obd);
 778                 /* bug 1580: decide how to properly sync() in recovery */
 779                 //mds_fsync_super(mds->mds_sb);
 780                 class_export_put(req->rq_export);
 781                 OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 782                 OBD_FREE(req, sizeof *req);
 783                 spin_lock_bh(&obd->obd_processing_task_lock);
 784                 obd->obd_next_recovery_transno++;
 785                 if (list_empty(&obd->obd_recovery_queue)) {
 786                         obd->obd_processing_task = 0;
 787                         spin_unlock_bh(&obd->obd_processing_task_lock);
 788                         break;
 789                 }
 790                 spin_unlock_bh(&obd->obd_processing_task_lock);
 791         }
 792         EXIT;
 793 }
 794
 795 int target_queue_recovery_request(struct ptlrpc_request *req,
 796                                   struct obd_device *obd)
 797 {
 798         struct list_head *tmp;
 799         int inserted = 0;
 800         __u64 transno = req->rq_reqmsg->transno;
 801         struct ptlrpc_request *saved_req;
 802         struct lustre_msg *reqmsg;
 803
 804         /* CAVEAT EMPTOR: The incoming request message has been swabbed
 805          * (i.e. buflens etc are in my own byte order), but type-dependent
 806          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
 807
 808         if (!transno) {
 809                 INIT_LIST_HEAD(&req->rq_list);
 810                 DEBUG_REQ(D_HA, req, "not queueing");
 811                 return 1;
 812         }
 813
 814         /* XXX If I were a real man, these LBUGs would be sane cleanups. */
 815         /* XXX just like the request-dup code in queue_final_reply */
 816         OBD_ALLOC(saved_req, sizeof *saved_req);
 817         if (!saved_req)
 818                 LBUG();
 819         OBD_ALLOC(reqmsg, req->rq_reqlen);
 820         if (!reqmsg)
 821                 LBUG();
 822
 823         spin_lock_bh(&obd->obd_processing_task_lock);
 824
 825         /* If we're processing the queue, we want don't want to queue this
 826          * message.
 827          *
 828          * Also, if this request has a transno less than the one we're waiting
 829          * for, we should process it now.  It could (and currently always will)
 830          * be an open request for a descriptor that was opened some time ago.
 831          */
 832         if (obd->obd_processing_task == current->pid ||
 833             transno < obd->obd_next_recovery_transno) {
 834                 /* Processing the queue right now, don't re-add. */
 835                 LASSERT(list_empty(&req->rq_list));
 836                 spin_unlock_bh(&obd->obd_processing_task_lock);
 837                 OBD_FREE(reqmsg, req->rq_reqlen);
 838                 OBD_FREE(saved_req, sizeof *saved_req);
 839                 return 1;
 840         }
 841
 842         memcpy(saved_req, req, sizeof *req);
 843         memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
 844         req = saved_req;
 845         req->rq_reqmsg = reqmsg;
 846         class_export_get(req->rq_export);
 847         INIT_LIST_HEAD(&req->rq_list);
 848
 849         /* XXX O(n^2) */
 850         list_for_each(tmp, &obd->obd_recovery_queue) {
 851                 struct ptlrpc_request *reqiter =
 852                         list_entry(tmp, struct ptlrpc_request, rq_list);
 853
 854                 if (reqiter->rq_reqmsg->transno > transno) {
 855                         list_add_tail(&req->rq_list, &reqiter->rq_list);
 856                         inserted = 1;
 857                         break;
 858                 }
 859         }
 860
 861         if (!inserted) {
 862                 list_add_tail(&req->rq_list, &obd->obd_recovery_queue);
 863         }
 864
 865         obd->obd_requests_queued_for_recovery++;
 866
 867         if (obd->obd_processing_task != 0) {
 868                 /* Someone else is processing this queue, we'll leave it to
 869                  * them.
 870                  */
 871                 wake_up(&obd->obd_next_transno_waitq);
 872                 spin_unlock_bh(&obd->obd_processing_task_lock);
 873                 return 0;
 874         }
 875
 876         /* Nobody is processing, and we know there's (at least) one to process
 877          * now, so we'll do the honours.
 878          */
 879         obd->obd_processing_task = current->pid;
 880         spin_unlock_bh(&obd->obd_processing_task_lock);
 881
 882         process_recovery_queue(obd);
 883         return 0;
 884 }
 885
 886 struct obd_device * target_req2obd(struct ptlrpc_request *req)
 887 {
 888         return req->rq_export->exp_obd;
 889 }
 890
 891 int target_queue_final_reply(struct ptlrpc_request *req, int rc)
 892 {
 893         struct obd_device *obd = target_req2obd(req);
 894         struct ptlrpc_request *saved_req;
 895         struct lustre_msg *reqmsg;
 896         int recovery_done = 0;
 897         int rc2;
 898
 899         if (rc) {
 900                 /* Just like ptlrpc_error, but without the sending. */
 901                 rc = lustre_pack_reply(req, 0, NULL, NULL);
 902                 LASSERT(rc == 0); /* XXX handle this */
 903                 req->rq_type = PTL_RPC_MSG_ERR;
 904         }
 905
 906         LASSERT(list_empty(&req->rq_list));
 907         /* XXX a bit like the request-dup code in queue_recovery_request */
 908         OBD_ALLOC(saved_req, sizeof *saved_req);
 909         if (!saved_req)
 910                 LBUG();
 911         OBD_ALLOC(reqmsg, req->rq_reqlen);
 912         if (!reqmsg)
 913                 LBUG();
 914         memcpy(saved_req, req, sizeof *saved_req);
 915         memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
 916         req = saved_req;
 917         req->rq_reqmsg = reqmsg;
 918         list_add(&req->rq_list, &obd->obd_delayed_reply_queue);
 919
 920         spin_lock_bh(&obd->obd_processing_task_lock);
 921         --obd->obd_recoverable_clients;
 922         recovery_done = (obd->obd_recoverable_clients == 0);
 923         spin_unlock_bh(&obd->obd_processing_task_lock);
 924
 925         if (recovery_done) {
 926                 struct list_head *tmp, *n;
 927                 ldlm_reprocess_all_ns(req->rq_export->exp_obd->obd_namespace);
 928                 CWARN("%s: all clients recovered, sending delayed replies\n",
 929                        obd->obd_name);
 930                 obd->obd_recovering = 0;
 931
 932                 /* when recovering finished, cleanup orphans for mds */
 933                 if (OBT(obd) && OBP(obd, postrecov)) {
 934                         rc2 = OBP(obd, postrecov)(obd);
 935                         if (rc2 >= 0)
 936                                 CWARN("%s: all clients recovered, %d MDS orphans "
 937                                        "deleted\n", obd->obd_name, rc2);
 938                         else
 939                                 CERROR("postrecov failed %d\n", rc2);
 940                 }
 941
 942                 list_for_each_safe(tmp, n, &obd->obd_delayed_reply_queue) {
 943                         req = list_entry(tmp, struct ptlrpc_request, rq_list);
 944                         DEBUG_REQ(D_ERROR, req, "delayed:");
 945                         ptlrpc_reply(req);
 946                         list_del(&req->rq_list);
 947                         OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 948                         OBD_FREE(req, sizeof *req);
 949                 }
 950                 target_cancel_recovery_timer(obd);
 951         } else {
 952                 CERROR("%s: %d recoverable clients remain\n",
 953                        obd->obd_name, obd->obd_recoverable_clients);
 954                 wake_up(&obd->obd_next_transno_waitq);
 955         }
 956
 957         return 1;
 958 }
 959
 960 static void ptlrpc_abort_reply (struct ptlrpc_request *req)
 961 {
 962         /* On return, we must be sure that the ACK callback has either
 963          * happened or will not happen.  Note that the SENT callback will
 964          * happen come what may since we successfully posted the PUT. */
 965         int rc;
 966         struct l_wait_info lwi;
 967         unsigned long flags;
 968
 969  again:
 970         /* serialise with ACK callback */
 971         spin_lock_irqsave (&req->rq_lock, flags);
 972         if (!req->rq_want_ack) {
 973                 spin_unlock_irqrestore (&req->rq_lock, flags);
 974                 /* The ACK callback has happened already.  Although the
 975                  * SENT callback might still be outstanding (yes really) we
 976                  * don't care; this is just like normal completion. */
 977                 return;
 978         }
 979         spin_unlock_irqrestore (&req->rq_lock, flags);
 980
 981         /* Have a bash at unlinking the MD.  This will fail until the SENT
 982          * callback has happened since the MD is busy from the PUT.  If the
 983          * ACK still hasn't arrived after then, a successful unlink will
 984          * ensure the ACK callback never happens. */
 985         rc = PtlMDUnlink (req->rq_reply_md_h);
 986         switch (rc) {
 987         default:
 988                 LBUG ();
 989         case PTL_OK:
 990                 /* SENT callback happened; ACK callback preempted */
 991                 LASSERT (req->rq_want_ack);
 992                 spin_lock_irqsave (&req->rq_lock, flags);
 993                 req->rq_want_ack = 0;
 994                 spin_unlock_irqrestore (&req->rq_lock, flags);
 995                 return;
 996         case PTL_INV_MD:
 997                 return;
 998         case PTL_MD_INUSE:
 999                 /* Still sending or ACK callback in progress: wait until
1000                  * either callback has completed and try again.
1001                  * Actually we can't wait for the SENT callback because
1002                  * there's no state the SENT callback can touch that will
1003                  * allow it to communicate with us!  So we just wait here
1004                  * for a short time, effectively polling for the SENT
1005                  * callback by calling PtlMDUnlink() again, to see if it
1006                  * has finished.  Note that if the ACK does arrive, its
1007                  * callback wakes us in short order. --eeb */
1008                 lwi = LWI_TIMEOUT (HZ/4, NULL, NULL);
1009                 rc = l_wait_event(req->rq_reply_waitq, !req->rq_want_ack,
1010                                   &lwi);
1011                 CDEBUG (D_HA, "Retrying req %p: %d\n", req, rc);
1012                 /* NB go back and test rq_want_ack with locking, to ensure
1013                  * if ACK callback happened, it has completed stopped
1014                  * referencing this req. */
1015                 goto again;
1016         }
1017 }
1018
1019 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
1020 {
1021         int i;
1022         int netrc;
1023         unsigned long flags;
1024         struct ptlrpc_req_ack_lock *ack_lock;
1025         struct l_wait_info lwi = { 0 };
1026         wait_queue_t commit_wait;
1027         struct obd_device *obd =
1028                 req->rq_export ? req->rq_export->exp_obd : NULL;
1029         struct obd_export *exp = NULL;
1030
1031         if (req->rq_export) {
1032                 for (i = 0; i < REQ_MAX_ACK_LOCKS; i++) {
1033                         if (req->rq_ack_locks[i].mode) {
1034                                 exp = req->rq_export;
1035                                 break;
1036                         }
1037                 }
1038         }
1039
1040         if (exp) {
1041                 exp->exp_outstanding_reply = req;
1042                 spin_lock_irqsave (&req->rq_lock, flags);
1043                 req->rq_want_ack = 1;
1044                 spin_unlock_irqrestore (&req->rq_lock, flags);
1045         }
1046
1047         if (!OBD_FAIL_CHECK(fail_id | OBD_FAIL_ONCE)) {
1048                 if (rc == 0) {
1049                         DEBUG_REQ(D_NET, req, "sending reply");
1050                         netrc = ptlrpc_reply(req);
1051                 } else if (rc == -ENOTCONN) {
1052                         DEBUG_REQ(D_HA, req, "processing error (%d)", rc);
1053                         netrc = ptlrpc_error(req);
1054                 } else {
1055                         DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
1056                         netrc = ptlrpc_error(req);
1057                 }
1058         } else {
1059                 obd_fail_loc |= OBD_FAIL_ONCE | OBD_FAILED;
1060                 DEBUG_REQ(D_ERROR, req, "dropping reply");
1061                 if (req->rq_repmsg) {
1062                         OBD_FREE(req->rq_repmsg, req->rq_replen);
1063                         req->rq_repmsg = NULL;
1064                 }
1065                 init_waitqueue_head(&req->rq_reply_waitq);
1066                 netrc = 0;
1067         }
1068
1069         /* a failed send simulates the callbacks */
1070         LASSERT(netrc == 0 || req->rq_want_ack == 0);
1071         if (exp == NULL) {
1072                 LASSERT(req->rq_want_ack == 0);
1073                 return;
1074         }
1075         LASSERT(obd != NULL);
1076
1077         init_waitqueue_entry(&commit_wait, current);
1078         add_wait_queue(&obd->obd_commit_waitq, &commit_wait);
1079         rc = l_wait_event(req->rq_reply_waitq,
1080                           !req->rq_want_ack || req->rq_resent ||
1081                           req->rq_transno <= obd->obd_last_committed, &lwi);
1082         remove_wait_queue(&obd->obd_commit_waitq, &commit_wait);
1083
1084         spin_lock_irqsave (&req->rq_lock, flags);
1085         /* If we got here because the ACK callback ran, this acts as a
1086          * barrier to ensure the callback completed the wakeup. */
1087         spin_unlock_irqrestore (&req->rq_lock, flags);
1088
1089         /* If we committed the transno already, then we might wake up before
1090          * the ack arrives.  We need to stop waiting for the ack before we can
1091          * reuse this request structure.  We are guaranteed by this point that
1092          * this cannot abort the sending of the actual reply.*/
1093         ptlrpc_abort_reply(req);
1094
1095         if (req->rq_resent) {
1096                 DEBUG_REQ(D_HA, req, "resent: not cancelling locks");
1097                 return;
1098         }
1099
1100         LASSERT(rc == 0);
1101         DEBUG_REQ(D_HA, req, "cancelling locks for %s",
1102                   req->rq_want_ack ? "commit" : "ack");
1103
1104         exp->exp_outstanding_reply = NULL;
1105
1106         for (ack_lock = req->rq_ack_locks, i = 0;
1107              i < REQ_MAX_ACK_LOCKS; i++, ack_lock++) {
1108                 if (!ack_lock->mode)
1109                         continue;
1110                 ldlm_lock_decref(&ack_lock->lock, ack_lock->mode);
1111         }
1112 }
1113
1114 int target_handle_ping(struct ptlrpc_request *req)
1115 {
1116         return lustre_pack_reply(req, 0, NULL, NULL);
1117 }
1118
1119 void *ldlm_put_lock_into_req(struct ptlrpc_request *req,
1120                                 struct lustre_handle *lock, int mode)
1121 {
1122         int i;
1123
1124         for (i = 0; i < REQ_MAX_ACK_LOCKS; i++) {
1125                 if (req->rq_ack_locks[i].mode)
1126                         continue;
1127                 memcpy(&req->rq_ack_locks[i].lock, lock, sizeof(*lock));
1128                 req->rq_ack_locks[i].mode = mode;
1129                 return &req->rq_ack_locks[i];
1130         }
1131         CERROR("no space for lock in struct ptlrpc_request\n");
1132         LBUG();
1133         return NULL;
1134 }
1135