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;
  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         rc = 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, int initial_conn)
 337 {
 338         if (exp->exp_connection && !initial_conn) {
 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         int initial_conn = 0;
 378         ENTRY;
 379
 380         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 381
 382         LASSERT_REQSWAB (req, 0);
 383         str = lustre_msg_string(req->rq_reqmsg, 0, sizeof(tgtuuid) - 1);
 384         if (str == NULL) {
 385                 CERROR("bad target UUID for connect\n");
 386                 GOTO(out, rc = -EINVAL);
 387         }
 388
 389         obd_str2uuid (&tgtuuid, str);
 390         target = class_uuid2obd(&tgtuuid);
 391         if (!target) {
 392                 target = class_name2obd(str);
 393         }
 394
 395         if (!target || target->obd_stopping || !target->obd_set_up) {
 396                 CERROR("UUID '%s' is not available for connect\n", str);
 397
 398                 GOTO(out, rc = -ENODEV);
 399         }
 400
 401         LASSERT_REQSWAB (req, 1);
 402         str = lustre_msg_string(req->rq_reqmsg, 1, sizeof(cluuid) - 1);
 403         if (str == NULL) {
 404                 CERROR("bad client UUID for connect\n");
 405                 GOTO(out, rc = -EINVAL);
 406         }
 407
 408         obd_str2uuid (&cluuid, str);
 409
 410         /* XXX extract a nettype and format accordingly */
 411         switch (sizeof(ptl_nid_t)) {
 412                 /* NB the casts only avoid compiler warnings */
 413         case 8:
 414                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 415                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.peer_nid);
 416                 break;
 417         case 4:
 418                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 419                          "NET_%x_UUID", (__u32)req->rq_peer.peer_nid);
 420                 break;
 421         default:
 422                 LBUG();
 423         }
 424
 425         spin_lock_bh(&target->obd_processing_task_lock);
 426         abort_recovery = target->obd_abort_recovery;
 427         spin_unlock_bh(&target->obd_processing_task_lock);
 428         if (abort_recovery)
 429                 target_abort_recovery(target);
 430
 431         tmp = lustre_msg_buf(req->rq_reqmsg, 2, sizeof conn);
 432         if (tmp == NULL)
 433                 GOTO(out, rc = -EPROTO);
 434
 435         memcpy(&conn, tmp, sizeof conn);
 436
 437         rc = lustre_pack_reply(req, 0, NULL, NULL);
 438         if (rc)
 439                 GOTO(out, rc);
 440
 441         /* lctl gets a backstage, all-access pass. */
 442         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 443                 goto dont_check_exports;
 444
 445         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL)
 446                 initial_conn = 1;
 447
 448         spin_lock(&target->obd_dev_lock);
 449         list_for_each(p, &target->obd_exports) {
 450                 export = list_entry(p, struct obd_export, exp_obd_chain);
 451                 if (obd_uuid_equals(&cluuid, &export->exp_client_uuid)) {
 452                         spin_unlock(&target->obd_dev_lock);
 453                         LASSERT(export->exp_obd == target);
 454
 455                         rc = target_handle_reconnect(&conn, export, &cluuid,
 456                                                      initial_conn);
 457                         break;
 458                 }
 459                 export = NULL;
 460         }
 461         /* If we found an export, we already unlocked. */
 462         if (!export) {
 463                 spin_unlock(&target->obd_dev_lock);
 464         } else if (req->rq_reqmsg->conn_cnt == 1 && !initial_conn) {
 465                 CERROR("%s reconnected with 1 conn_cnt; cookies not random?\n",
 466                        cluuid.uuid);
 467                 GOTO(out, rc = -EALREADY);
 468         }
 469
 470         /* Tell the client if we're in recovery. */
 471         /* If this is the first client, start the recovery timer */
 472         CWARN("%s: connection from %s %s\n", target->obd_name, cluuid.uuid,
 473               target->obd_recovering ? "(recovering)" : "");
 474         if (target->obd_recovering) {
 475                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 476                 target_start_recovery_timer(target, handler);
 477         }
 478 #if 0
 479         /* Tell the client if we support replayable requests */
 480         if (target->obd_replayable)
 481                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 482 #endif
 483         if (export == NULL) {
 484                 if (target->obd_recovering) {
 485                         CERROR("denying connection for new client %s: "
 486                                "%d clients in recovery for %lds\n", cluuid.uuid,
 487                                target->obd_recoverable_clients,
 488                                (target->obd_recovery_timer.expires-jiffies)/HZ);
 489                         rc = -EBUSY;
 490                 } else {
 491  dont_check_exports:
 492                         rc = obd_connect(&conn, target, &cluuid);
 493                 }
 494         }
 495         /* Tell the client if we support replayable requests */
 496         if (target->obd_replayable)
 497                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 498
 499         /* If all else goes well, this is our RPC return code. */
 500         req->rq_status = 0;
 501
 502         if (rc && rc != EALREADY)
 503                 GOTO(out, rc);
 504
 505         req->rq_repmsg->handle = conn;
 506
 507         /* If the client and the server are the same node, we will already
 508          * have an export that really points to the client's DLM export,
 509          * because we have a shared handles table.
 510          *
 511          * XXX this will go away when shaver stops sending the "connect" handle
 512          * in the real "remote handle" field of the request --phik 24 Apr 2003
 513          */
 514         if (req->rq_export != NULL)
 515                 class_export_put(req->rq_export);
 516
 517         /* ownership of this export ref transfers to the request */
 518         export = req->rq_export = class_conn2export(&conn);
 519         LASSERT(export != NULL);
 520
 521         spin_lock_irqsave(&export->exp_lock, flags);
 522         if (initial_conn) {
 523                 req->rq_repmsg->conn_cnt = export->exp_conn_cnt + 1;
 524         } else if (export->exp_conn_cnt >= req->rq_reqmsg->conn_cnt) {
 525                 CERROR("%s: already connected at a higher conn_cnt: %d > %d\n",
 526                        cluuid.uuid, export->exp_conn_cnt,
 527                        req->rq_reqmsg->conn_cnt);
 528                 spin_unlock_irqrestore(&export->exp_lock, flags);
 529                 GOTO(out, rc = -EALREADY);
 530         }
 531         export->exp_conn_cnt = req->rq_reqmsg->conn_cnt;
 532         spin_unlock_irqrestore(&export->exp_lock, flags);
 533
 534         /* request from liblustre? */
 535         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT)
 536                 export->exp_libclient = 1;
 537
 538         if (export->exp_connection != NULL)
 539                 ptlrpc_put_connection(export->exp_connection);
 540         export->exp_connection = ptlrpc_get_connection(&req->rq_peer,
 541                                                        &remote_uuid);
 542
 543         if (rc == EALREADY) {
 544                 /* We indicate the reconnection in a flag, not an error code. */
 545                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 546                 GOTO(out, rc = 0);
 547         }
 548
 549         if (target->obd_recovering) {
 550                 target->obd_connected_clients++;
 551         }
 552
 553         memcpy(&conn, lustre_msg_buf(req->rq_reqmsg, 2, sizeof conn),
 554                sizeof conn);
 555
 556         if (export->exp_imp_reverse != NULL)
 557                 class_destroy_import(export->exp_imp_reverse);
 558         revimp = export->exp_imp_reverse = class_new_import();
 559         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
 560         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
 561         revimp->imp_remote_handle = conn;
 562         revimp->imp_obd = target;
 563         revimp->imp_dlm_fake = 1;
 564         revimp->imp_state = LUSTRE_IMP_FULL;
 565         class_import_put(revimp);
 566 out:
 567         if (rc)
 568                 req->rq_status = rc;
 569         RETURN(rc);
 570 }
 571
 572 int target_handle_disconnect(struct ptlrpc_request *req)
 573 {
 574         struct obd_export *exp;
 575         int rc;
 576         ENTRY;
 577
 578         rc = lustre_pack_reply(req, 0, NULL, NULL);
 579         if (rc)
 580                 RETURN(rc);
 581
 582         /* keep the rq_export around so we can send the reply */
 583         exp = class_export_get(req->rq_export);
 584         req->rq_status = obd_disconnect(exp, 0);
 585         RETURN(0);
 586 }
 587
 588 void target_destroy_export(struct obd_export *exp)
 589 {
 590         /* exports created from last_rcvd data, and "fake"
 591            exports created by lctl don't have an import */
 592         if (exp->exp_imp_reverse != NULL)
 593                 class_destroy_import(exp->exp_imp_reverse);
 594
 595         /* We cancel locks at disconnect time, but this will catch any locks
 596          * granted in a race with recovery-induced disconnect. */
 597         if (exp->exp_obd->obd_namespace != NULL)
 598                 ldlm_cancel_locks_for_export(exp);
 599 }
 600
 601 /*
 602  * Recovery functions
 603  */
 604
 605 static void abort_delayed_replies(struct obd_device *obd)
 606 {
 607         struct ptlrpc_request *req;
 608         struct list_head *tmp, *n;
 609         list_for_each_safe(tmp, n, &obd->obd_delayed_reply_queue) {
 610                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 611                 DEBUG_REQ(D_ERROR, req, "aborted:");
 612                 req->rq_status = -ENOTCONN;
 613                 req->rq_type = PTL_RPC_MSG_ERR;
 614                 ptlrpc_reply(req);
 615                 class_export_put(req->rq_export);
 616                 list_del(&req->rq_list);
 617                 OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 618                 OBD_FREE(req, sizeof *req);
 619         }
 620 }
 621
 622 static void abort_recovery_queue(struct obd_device *obd)
 623 {
 624         struct ptlrpc_request *req;
 625         struct list_head *tmp, *n;
 626         int rc;
 627
 628         list_for_each_safe(tmp, n, &obd->obd_recovery_queue) {
 629                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 630                 DEBUG_REQ(D_ERROR, req, "aborted:");
 631                 req->rq_status = -ENOTCONN;
 632                 req->rq_type = PTL_RPC_MSG_ERR;
 633                 rc = lustre_pack_reply(req, 0, NULL, NULL);
 634                 if (rc == 0) {
 635                         ptlrpc_reply(req);
 636                 } else {
 637                         DEBUG_REQ(D_ERROR, req,
 638                                   "packing failed for abort-reply; skipping");
 639                 }
 640                 list_del(&req->rq_list);
 641                 class_export_put(req->rq_export);
 642                 OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 643                 OBD_FREE(req, sizeof *req);
 644         }
 645 }
 646
 647 void target_abort_recovery(void *data)
 648 {
 649         struct obd_device *obd = data;
 650         int rc;
 651
 652         CERROR("disconnecting clients and aborting recovery\n");
 653         spin_lock_bh(&obd->obd_processing_task_lock);
 654         if (!obd->obd_recovering) {
 655                 spin_unlock_bh(&obd->obd_processing_task_lock);
 656                 EXIT;
 657                 return;
 658         }
 659
 660         obd->obd_recovering = obd->obd_abort_recovery = 0;
 661
 662         wake_up(&obd->obd_next_transno_waitq);
 663         target_cancel_recovery_timer(obd);
 664         spin_unlock_bh(&obd->obd_processing_task_lock);
 665
 666         class_disconnect_exports(obd, 0);
 667
 668         /* when recovery was aborted, cleanup orphans on mds and ost */
 669         if (OBT(obd) && OBP(obd, postrecov)) {
 670                 rc = OBP(obd, postrecov)(obd);
 671                 if (rc >= 0)
 672                         CWARN("Cleanup %d orphans after recovery was aborted\n", rc);
 673                 else
 674                         CERROR("postrecov failed %d\n", rc);
 675         }
 676
 677         abort_delayed_replies(obd);
 678         abort_recovery_queue(obd);
 679         ptlrpc_run_recovery_over_upcall(obd);
 680 }
 681
 682 static void target_recovery_expired(unsigned long castmeharder)
 683 {
 684         struct obd_device *obd = (struct obd_device *)castmeharder;
 685         CERROR("recovery timed out, aborting\n");
 686         spin_lock_bh(&obd->obd_processing_task_lock);
 687         obd->obd_abort_recovery = 1;
 688         wake_up(&obd->obd_next_transno_waitq);
 689         spin_unlock_bh(&obd->obd_processing_task_lock);
 690 }
 691
 692
 693 /* obd_processing_task_lock should be held */
 694 void target_cancel_recovery_timer(struct obd_device *obd)
 695 {
 696         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
 697         del_timer(&obd->obd_recovery_timer);
 698 }
 699
 700 static void reset_recovery_timer(struct obd_device *obd)
 701 {
 702         spin_lock_bh(&obd->obd_processing_task_lock);
 703         if (!obd->obd_recovering) {
 704                 spin_unlock_bh(&obd->obd_processing_task_lock);
 705                 return;
 706         }
 707         CDEBUG(D_HA, "timer will expire in %u seconds\n",
 708                OBD_RECOVERY_TIMEOUT / HZ);
 709         mod_timer(&obd->obd_recovery_timer, jiffies + OBD_RECOVERY_TIMEOUT);
 710         spin_unlock_bh(&obd->obd_processing_task_lock);
 711 }
 712
 713
 714 /* Only start it the first time called */
 715 void target_start_recovery_timer(struct obd_device *obd, svc_handler_t handler)
 716 {
 717         spin_lock_bh(&obd->obd_processing_task_lock);
 718         if (obd->obd_recovery_handler) {
 719                 spin_unlock_bh(&obd->obd_processing_task_lock);
 720                 return;
 721         }
 722         CWARN("%s: starting recovery timer (%us)\n", obd->obd_name,
 723                OBD_RECOVERY_TIMEOUT / HZ);
 724         obd->obd_recovery_handler = handler;
 725         obd->obd_recovery_timer.function = target_recovery_expired;
 726         obd->obd_recovery_timer.data = (unsigned long)obd;
 727         spin_unlock_bh(&obd->obd_processing_task_lock);
 728
 729         reset_recovery_timer(obd);
 730 }
 731
 732 static int check_for_next_transno(struct obd_device *obd)
 733 {
 734         struct ptlrpc_request *req;
 735         int wake_up = 0, connected, completed, queue_len, max;
 736         __u64 next_transno, req_transno;
 737
 738         spin_lock_bh(&obd->obd_processing_task_lock);
 739         req = list_entry(obd->obd_recovery_queue.next,
 740                          struct ptlrpc_request, rq_list);
 741         max = obd->obd_max_recoverable_clients;
 742         req_transno = req->rq_reqmsg->transno;
 743         connected = obd->obd_connected_clients;
 744         completed = max - obd->obd_recoverable_clients;
 745         queue_len = obd->obd_requests_queued_for_recovery;
 746         next_transno = obd->obd_next_recovery_transno;
 747
 748         CDEBUG(D_HA,"max: %d, connected: %d, completed: %d, queue_len: %d, "
 749                "req_transno: "LPU64", next_transno: "LPU64"\n",
 750                max, connected, completed, queue_len, req_transno, next_transno);
 751         if (obd->obd_abort_recovery) {
 752                 CDEBUG(D_HA, "waking for aborted recovery\n");
 753                 wake_up = 1;
 754         } else if (!obd->obd_recovering) {
 755                 CDEBUG(D_HA, "waking for completed recovery (?)\n");
 756                 wake_up = 1;
 757         } else if (req_transno == next_transno) {
 758                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
 759                 wake_up = 1;
 760         } else if (queue_len + completed == max) {
 761                 CDEBUG(D_ERROR,
 762                        "waking for skipped transno (skip: "LPD64
 763                        ", ql: %d, comp: %d, conn: %d, next: "LPD64")\n",
 764                        next_transno, queue_len, completed, max, req_transno);
 765                 obd->obd_next_recovery_transno = req_transno;
 766                 wake_up = 1;
 767         }
 768         spin_unlock_bh(&obd->obd_processing_task_lock);
 769         LASSERT(req->rq_reqmsg->transno >= next_transno);
 770         return wake_up;
 771 }
 772
 773 static void process_recovery_queue(struct obd_device *obd)
 774 {
 775         struct ptlrpc_request *req;
 776         int abort_recovery = 0;
 777         struct l_wait_info lwi = { 0 };
 778         ENTRY;
 779
 780         for (;;) {
 781                 spin_lock_bh(&obd->obd_processing_task_lock);
 782                 LASSERT(obd->obd_processing_task == current->pid);
 783                 req = list_entry(obd->obd_recovery_queue.next,
 784                                  struct ptlrpc_request, rq_list);
 785
 786                 if (req->rq_reqmsg->transno != obd->obd_next_recovery_transno) {
 787                         spin_unlock_bh(&obd->obd_processing_task_lock);
 788                         CDEBUG(D_HA, "Waiting for transno "LPD64" (1st is "
 789                                LPD64")\n",
 790                                obd->obd_next_recovery_transno,
 791                                req->rq_reqmsg->transno);
 792                         l_wait_event(obd->obd_next_transno_waitq,
 793                                      check_for_next_transno(obd), &lwi);
 794                         spin_lock_bh(&obd->obd_processing_task_lock);
 795                         abort_recovery = obd->obd_abort_recovery;
 796                         spin_unlock_bh(&obd->obd_processing_task_lock);
 797                         if (abort_recovery) {
 798                                 target_abort_recovery(obd);
 799                                 return;
 800                         }
 801                         continue;
 802                 }
 803                 list_del_init(&req->rq_list);
 804                 obd->obd_requests_queued_for_recovery--;
 805                 spin_unlock_bh(&obd->obd_processing_task_lock);
 806
 807                 DEBUG_REQ(D_HA, req, "processing: ");
 808                 (void)obd->obd_recovery_handler(req);
 809                 obd->obd_replayed_requests++;
 810                 reset_recovery_timer(obd);
 811                 /* bug 1580: decide how to properly sync() in recovery */
 812                 //mds_fsync_super(mds->mds_sb);
 813                 class_export_put(req->rq_export);
 814                 OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 815                 OBD_FREE(req, sizeof *req);
 816                 spin_lock_bh(&obd->obd_processing_task_lock);
 817                 obd->obd_next_recovery_transno++;
 818                 if (list_empty(&obd->obd_recovery_queue)) {
 819                         obd->obd_processing_task = 0;
 820                         spin_unlock_bh(&obd->obd_processing_task_lock);
 821                         break;
 822                 }
 823                 spin_unlock_bh(&obd->obd_processing_task_lock);
 824         }
 825         EXIT;
 826 }
 827
 828 int target_queue_recovery_request(struct ptlrpc_request *req,
 829                                   struct obd_device *obd)
 830 {
 831         struct list_head *tmp;
 832         int inserted = 0;
 833         __u64 transno = req->rq_reqmsg->transno;
 834         struct ptlrpc_request *saved_req;
 835         struct lustre_msg *reqmsg;
 836
 837         /* CAVEAT EMPTOR: The incoming request message has been swabbed
 838          * (i.e. buflens etc are in my own byte order), but type-dependent
 839          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
 840
 841         if (!transno) {
 842                 INIT_LIST_HEAD(&req->rq_list);
 843                 DEBUG_REQ(D_HA, req, "not queueing");
 844                 return 1;
 845         }
 846
 847         /* XXX If I were a real man, these LBUGs would be sane cleanups. */
 848         /* XXX just like the request-dup code in queue_final_reply */
 849         OBD_ALLOC(saved_req, sizeof *saved_req);
 850         if (!saved_req)
 851                 LBUG();
 852         OBD_ALLOC(reqmsg, req->rq_reqlen);
 853         if (!reqmsg)
 854                 LBUG();
 855
 856         spin_lock_bh(&obd->obd_processing_task_lock);
 857
 858         /* If we're processing the queue, we want don't want to queue this
 859          * message.
 860          *
 861          * Also, if this request has a transno less than the one we're waiting
 862          * for, we should process it now.  It could (and currently always will)
 863          * be an open request for a descriptor that was opened some time ago.
 864          *
 865          * Also, a resent, replayed request that has already been
 866          * handled will pass through here and be processed immediately.
 867          */
 868         if (obd->obd_processing_task == current->pid ||
 869             transno < obd->obd_next_recovery_transno) {
 870                 /* Processing the queue right now, don't re-add. */
 871                 LASSERT(list_empty(&req->rq_list));
 872                 spin_unlock_bh(&obd->obd_processing_task_lock);
 873                 OBD_FREE(reqmsg, req->rq_reqlen);
 874                 OBD_FREE(saved_req, sizeof *saved_req);
 875                 return 1;
 876         }
 877
 878         /* A resent, replayed request that is still on the queue; just drop it.
 879            The queued request will handle this. */
 880         if ((lustre_msg_get_flags(req->rq_reqmsg) & (MSG_RESENT | MSG_REPLAY)) ==
 881             (MSG_RESENT | MSG_REPLAY)) {
 882                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
 883                 spin_unlock_bh(&obd->obd_processing_task_lock);
 884                 OBD_FREE(reqmsg, req->rq_reqlen);
 885                 OBD_FREE(saved_req, sizeof *saved_req);
 886                 return 0;
 887         }
 888
 889         memcpy(saved_req, req, sizeof *req);
 890         memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
 891         req = saved_req;
 892         req->rq_reqmsg = reqmsg;
 893         class_export_get(req->rq_export);
 894         INIT_LIST_HEAD(&req->rq_list);
 895
 896         /* XXX O(n^2) */
 897         list_for_each(tmp, &obd->obd_recovery_queue) {
 898                 struct ptlrpc_request *reqiter =
 899                         list_entry(tmp, struct ptlrpc_request, rq_list);
 900
 901                 if (reqiter->rq_reqmsg->transno > transno) {
 902                         list_add_tail(&req->rq_list, &reqiter->rq_list);
 903                         inserted = 1;
 904                         break;
 905                 }
 906         }
 907
 908         if (!inserted) {
 909                 list_add_tail(&req->rq_list, &obd->obd_recovery_queue);
 910         }
 911
 912         obd->obd_requests_queued_for_recovery++;
 913
 914         if (obd->obd_processing_task != 0) {
 915                 /* Someone else is processing this queue, we'll leave it to
 916                  * them.
 917                  */
 918                 wake_up(&obd->obd_next_transno_waitq);
 919                 spin_unlock_bh(&obd->obd_processing_task_lock);
 920                 return 0;
 921         }
 922
 923         /* Nobody is processing, and we know there's (at least) one to process
 924          * now, so we'll do the honours.
 925          */
 926         obd->obd_processing_task = current->pid;
 927         spin_unlock_bh(&obd->obd_processing_task_lock);
 928
 929         process_recovery_queue(obd);
 930         return 0;
 931 }
 932
 933 struct obd_device * target_req2obd(struct ptlrpc_request *req)
 934 {
 935         return req->rq_export->exp_obd;
 936 }
 937
 938 int target_queue_final_reply(struct ptlrpc_request *req, int rc)
 939 {
 940         struct obd_device *obd = target_req2obd(req);
 941         struct ptlrpc_request *saved_req;
 942         struct lustre_msg *reqmsg;
 943         int recovery_done = 0;
 944         int rc2;
 945
 946         LASSERT ((rc == 0) == (req->rq_reply_state != NULL));
 947
 948         if (rc) {
 949                 /* Just like ptlrpc_error, but without the sending. */
 950                 rc = lustre_pack_reply(req, 0, NULL, NULL);
 951                 LASSERT(rc == 0); /* XXX handle this */
 952                 req->rq_type = PTL_RPC_MSG_ERR;
 953         }
 954
 955         LASSERT (!req->rq_reply_state->rs_difficult);
 956         LASSERT(list_empty(&req->rq_list));
 957         /* XXX a bit like the request-dup code in queue_recovery_request */
 958         OBD_ALLOC(saved_req, sizeof *saved_req);
 959         if (!saved_req)
 960                 LBUG();
 961         OBD_ALLOC(reqmsg, req->rq_reqlen);
 962         if (!reqmsg)
 963                 LBUG();
 964         memcpy(saved_req, req, sizeof *saved_req);
 965         memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
 966         /* the copied req takes over the reply state */
 967         req->rq_reply_state = NULL;
 968         req = saved_req;
 969         req->rq_reqmsg = reqmsg;
 970         class_export_get(req->rq_export);
 971         list_add(&req->rq_list, &obd->obd_delayed_reply_queue);
 972
 973         spin_lock_bh(&obd->obd_processing_task_lock);
 974         --obd->obd_recoverable_clients;
 975         recovery_done = (obd->obd_recoverable_clients == 0);
 976         spin_unlock_bh(&obd->obd_processing_task_lock);
 977
 978         if (recovery_done) {
 979                 struct list_head *tmp, *n;
 980                 ldlm_reprocess_all_ns(req->rq_export->exp_obd->obd_namespace);
 981                 CWARN("%s: all clients recovered, sending delayed replies\n",
 982                        obd->obd_name);
 983                 spin_lock_bh(&obd->obd_processing_task_lock);
 984                 obd->obd_recovering = 0;
 985                 target_cancel_recovery_timer(obd);
 986                 spin_unlock_bh(&obd->obd_processing_task_lock);
 987
 988                 /* when recovery finished, cleanup orphans on mds and ost */
 989                 if (OBT(obd) && OBP(obd, postrecov)) {
 990                         rc2 = OBP(obd, postrecov)(obd);
 991                         if (rc2 >= 0)
 992                                 CWARN("%s: all clients recovered, %d MDS "
 993                                       "orphans deleted\n", obd->obd_name, rc2);
 994                         else
 995                                 CERROR("postrecov failed %d\n", rc2);
 996                 }
 997
 998                 list_for_each_safe(tmp, n, &obd->obd_delayed_reply_queue) {
 999                         req = list_entry(tmp, struct ptlrpc_request, rq_list);
1000                         DEBUG_REQ(D_ERROR, req, "delayed:");
1001                         ptlrpc_reply(req);
1002                         class_export_put(req->rq_export);
1003                         list_del(&req->rq_list);
1004                         OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
1005                         OBD_FREE(req, sizeof *req);
1006                 }
1007                 ptlrpc_run_recovery_over_upcall(obd);
1008         } else {
1009                 CWARN("%s: %d recoverable clients remain\n",
1010                        obd->obd_name, obd->obd_recoverable_clients);
1011                 wake_up(&obd->obd_next_transno_waitq);
1012         }
1013
1014         return 1;
1015 }
1016
1017 int
1018 target_send_reply_msg (struct ptlrpc_request *req, int rc, int fail_id)
1019 {
1020         if (OBD_FAIL_CHECK(fail_id | OBD_FAIL_ONCE)) {
1021                 obd_fail_loc |= OBD_FAIL_ONCE | OBD_FAILED;
1022                 DEBUG_REQ(D_ERROR, req, "dropping reply");
1023                 /* NB this does _not_ send with ACK disabled, to simulate
1024                  * sending OK, but timing out for the ACK */
1025                 if (req->rq_reply_state != NULL) {
1026                         if (!req->rq_reply_state->rs_difficult) {
1027                                 lustre_free_reply_state (req->rq_reply_state);
1028                                 req->rq_reply_state = NULL;
1029                         } else {
1030                                 struct ptlrpc_service *svc =
1031                                         req->rq_rqbd->rqbd_srv_ni->sni_service;
1032                                 atomic_inc(&svc->srv_outstanding_replies);
1033                         }
1034                 }
1035                 return (-ECOMM);
1036         }
1037
1038         if (rc) {
1039                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
1040                 if (req->rq_reply_state == NULL) {
1041                         rc = lustre_pack_reply (req, 0, NULL, NULL);
1042                         if (rc != 0) {
1043                                 CERROR ("can't allocate reply\n");
1044                                 return (rc);
1045                         }
1046                 }
1047                 req->rq_type = PTL_RPC_MSG_ERR;
1048         } else {
1049                 DEBUG_REQ(D_NET, req, "sending reply");
1050         }
1051
1052         return (ptlrpc_send_reply(req, 1));
1053 }
1054
1055 void
1056 target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
1057 {
1058         int                        netrc;
1059         unsigned long              flags;
1060         struct ptlrpc_reply_state *rs;
1061         struct obd_device         *obd;
1062         struct obd_export         *exp;
1063         struct ptlrpc_srv_ni      *sni;
1064         struct ptlrpc_service     *svc;
1065
1066         sni = req->rq_rqbd->rqbd_srv_ni;
1067         svc = sni->sni_service;
1068
1069         rs = req->rq_reply_state;
1070         if (rs == NULL || !rs->rs_difficult) {
1071                 /* The easy case; no notifiers and reply_out_callback()
1072                  * cleans up (i.e. we can't look inside rs after a
1073                  * successful send) */
1074                 netrc = target_send_reply_msg (req, rc, fail_id);
1075
1076                 LASSERT (netrc == 0 || req->rq_reply_state == NULL);
1077                 return;
1078         }
1079
1080         /* must be an export if locks saved */
1081         LASSERT (req->rq_export != NULL);
1082         /* req/reply consistent */
1083         LASSERT (rs->rs_srv_ni == sni);
1084
1085         /* "fresh" reply */
1086         LASSERT (!rs->rs_scheduled);
1087         LASSERT (!rs->rs_scheduled_ever);
1088         LASSERT (!rs->rs_handled);
1089         LASSERT (!rs->rs_on_net);
1090         LASSERT (rs->rs_export == NULL);
1091         LASSERT (list_empty(&rs->rs_obd_list));
1092         LASSERT (list_empty(&rs->rs_exp_list));
1093
1094         exp = class_export_get (req->rq_export);
1095         obd = exp->exp_obd;
1096
1097         /* disable reply scheduling onto srv_reply_queue while I'm setting up */
1098         rs->rs_scheduled = 1;
1099         rs->rs_on_net    = 1;
1100         rs->rs_xid       = req->rq_xid;
1101         rs->rs_transno   = req->rq_transno;
1102         rs->rs_export    = exp;
1103
1104         spin_lock_irqsave (&obd->obd_uncommitted_replies_lock, flags);
1105
1106         if (rs->rs_transno > obd->obd_last_committed) {
1107                 /* not committed already */
1108                 list_add_tail (&rs->rs_obd_list,
1109                                &obd->obd_uncommitted_replies);
1110         }
1111
1112         spin_unlock (&obd->obd_uncommitted_replies_lock);
1113         spin_lock (&exp->exp_lock);
1114
1115         list_add_tail (&rs->rs_exp_list, &exp->exp_outstanding_replies);
1116
1117         spin_unlock_irqrestore (&exp->exp_lock, flags);
1118
1119         netrc = target_send_reply_msg (req, rc, fail_id);
1120
1121         spin_lock_irqsave (&svc->srv_lock, flags);
1122
1123         svc->srv_n_difficult_replies++;
1124
1125         if (netrc != 0) /* error sending: reply is off the net */
1126                 rs->rs_on_net = 0;
1127
1128         if (!rs->rs_on_net ||                   /* some notifier */
1129             list_empty(&rs->rs_exp_list) ||     /* completed already */
1130             list_empty(&rs->rs_obd_list)) {
1131                 list_add_tail (&rs->rs_list, &svc->srv_reply_queue);
1132                 wake_up (&svc->srv_waitq);
1133         } else {
1134                 list_add (&rs->rs_list, &sni->sni_active_replies);
1135                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
1136         }
1137
1138         spin_unlock_irqrestore (&svc->srv_lock, flags);
1139 }
1140
1141 int target_handle_ping(struct ptlrpc_request *req)
1142 {
1143         return lustre_pack_reply(req, 0, NULL, NULL);
1144 }