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                           unsigned long connect_flags)
 224 {
 225         struct client_obd *cli = &obd->u.cli;
 226         struct obd_import *imp = cli->cl_import;
 227         struct obd_export *exp;
 228         int rc;
 229         ENTRY;
 230
 231         down(&cli->cl_sem);
 232         rc = class_connect(dlm_handle, obd, cluuid);
 233         if (rc)
 234                 GOTO(out_sem, rc);
 235
 236         cli->cl_conn_count++;
 237         if (cli->cl_conn_count > 1)
 238                 GOTO(out_sem, rc);
 239         exp = class_conn2export(dlm_handle);
 240
 241         if (obd->obd_namespace != NULL)
 242                 CERROR("already have namespace!\n");
 243         obd->obd_namespace = ldlm_namespace_new(obd->obd_name,
 244                                                 LDLM_NAMESPACE_CLIENT);
 245         if (obd->obd_namespace == NULL)
 246                 GOTO(out_disco, rc = -ENOMEM);
 247
 248         imp->imp_dlm_handle = *dlm_handle;
 249         rc = ptlrpc_init_import(imp);
 250         if (rc != 0)
 251                 GOTO(out_ldlm, rc);
 252
 253         exp->exp_connection = ptlrpc_connection_addref(imp->imp_connection);
 254         imp->imp_connect_flags = connect_flags;
 255         rc = ptlrpc_connect_import(imp, NULL);
 256         if (rc != 0) {
 257                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 258                 GOTO(out_ldlm, rc);
 259         }
 260
 261         ptlrpc_pinger_add_import(imp);
 262         EXIT;
 263
 264         if (rc) {
 265 out_ldlm:
 266                 ldlm_namespace_free(obd->obd_namespace, 0);
 267                 obd->obd_namespace = NULL;
 268 out_disco:
 269                 cli->cl_conn_count--;
 270                 class_disconnect(exp, 0);
 271         } else {
 272                 class_export_put(exp);
 273         }
 274 out_sem:
 275         up(&cli->cl_sem);
 276         return rc;
 277 }
 278
 279 int client_disconnect_export(struct obd_export *exp, int failover)
 280 {
 281         struct obd_device *obd = class_exp2obd(exp);
 282         struct client_obd *cli = &obd->u.cli;
 283         struct obd_import *imp = cli->cl_import;
 284         int rc = 0, err;
 285         ENTRY;
 286
 287         if (!obd) {
 288                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 289                        exp, exp ? exp->exp_handle.h_cookie : -1);
 290                 RETURN(-EINVAL);
 291         }
 292
 293         down(&cli->cl_sem);
 294         if (!cli->cl_conn_count) {
 295                 CERROR("disconnecting disconnected device (%s)\n",
 296                        obd->obd_name);
 297                 GOTO(out_sem, rc = -EINVAL);
 298         }
 299
 300         cli->cl_conn_count--;
 301         if (cli->cl_conn_count)
 302                 GOTO(out_no_disconnect, rc = 0);
 303
 304         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 305          * delete it regardless.  (It's safe to delete an import that was
 306          * never added.) */
 307         (void)ptlrpc_pinger_del_import(imp);
 308
 309         if (obd->obd_namespace != NULL) {
 310                 /* obd_no_recov == local only */
 311                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 312                                        obd->obd_no_recov, NULL);
 313                 ldlm_namespace_free(obd->obd_namespace, obd->obd_no_recov);
 314                 obd->obd_namespace = NULL;
 315         }
 316
 317         /* Yeah, obd_no_recov also (mainly) means "forced shutdown". */
 318         if (obd->obd_no_recov)
 319                 ptlrpc_invalidate_import(imp, 0);
 320         else
 321                 rc = ptlrpc_disconnect_import(imp);
 322
 323         EXIT;
 324  out_no_disconnect:
 325         err = class_disconnect(exp, 0);
 326         if (!rc && err)
 327                 rc = err;
 328  out_sem:
 329         up(&cli->cl_sem);
 330         RETURN(rc);
 331 }
 332
 333 /* --------------------------------------------------------------------------
 334  * from old lib/target.c
 335  * -------------------------------------------------------------------------- */
 336
 337 int target_handle_reconnect(struct lustre_handle *conn, struct obd_export *exp,
 338                             struct obd_uuid *cluuid, int initial_conn)
 339 {
 340         if (exp->exp_connection && !initial_conn) {
 341                 struct lustre_handle *hdl;
 342                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 343                 /* Might be a re-connect after a partition. */
 344                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 345                         CERROR("%s reconnecting\n", cluuid->uuid);
 346                         conn->cookie = exp->exp_handle.h_cookie;
 347                         RETURN(EALREADY);
 348                 } else {
 349                         CERROR("%s reconnecting from %s, "
 350                                "handle mismatch (ours "LPX64", theirs "
 351                                LPX64")\n", cluuid->uuid,
 352                                exp->exp_connection->c_remote_uuid.uuid,
 353                                hdl->cookie, conn->cookie);
 354                         memset(conn, 0, sizeof *conn);
 355                         RETURN(-EALREADY);
 356                 }
 357         }
 358
 359         conn->cookie = exp->exp_handle.h_cookie;
 360         CDEBUG(D_INFO, "existing export for UUID '%s' at %p\n",
 361                cluuid->uuid, exp);
 362         CDEBUG(D_IOCTL,"connect: cookie "LPX64"\n", conn->cookie);
 363         RETURN(0);
 364 }
 365
 366 int target_handle_connect(struct ptlrpc_request *req)
 367 {
 368         unsigned long connect_flags = 0, *cfp;
 369         struct obd_device *target;
 370         struct obd_export *export = NULL;
 371         struct obd_import *revimp;
 372         struct lustre_handle conn;
 373         struct obd_uuid tgtuuid;
 374         struct obd_uuid cluuid;
 375         struct obd_uuid remote_uuid;
 376         struct list_head *p;
 377         char *str, *tmp;
 378         int rc = 0;
 379         unsigned long flags;
 380         int initial_conn = 0;
 381         char peer_str[PTL_NALFMT_SIZE];
 382         ENTRY;
 383
 384         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 385
 386         LASSERT_REQSWAB (req, 0);
 387         str = lustre_msg_string(req->rq_reqmsg, 0, sizeof(tgtuuid) - 1);
 388         if (str == NULL) {
 389                 CERROR("bad target UUID for connect\n");
 390                 GOTO(out, rc = -EINVAL);
 391         }
 392
 393         obd_str2uuid (&tgtuuid, str);
 394         target = class_uuid2obd(&tgtuuid);
 395         if (!target) {
 396                 target = class_name2obd(str);
 397         }
 398
 399         if (!target || target->obd_stopping || !target->obd_set_up) {
 400                 CERROR("UUID '%s' is not available for connect\n", str);
 401
 402                 GOTO(out, rc = -ENODEV);
 403         }
 404
 405         LASSERT_REQSWAB (req, 1);
 406         str = lustre_msg_string(req->rq_reqmsg, 1, sizeof(cluuid) - 1);
 407         if (str == NULL) {
 408                 CERROR("bad client UUID for connect\n");
 409                 GOTO(out, rc = -EINVAL);
 410         }
 411
 412         obd_str2uuid (&cluuid, str);
 413
 414         /* XXX extract a nettype and format accordingly */
 415         switch (sizeof(ptl_nid_t)) {
 416                 /* NB the casts only avoid compiler warnings */
 417         case 8:
 418                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 419                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.peer_nid);
 420                 break;
 421         case 4:
 422                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 423                          "NET_%x_UUID", (__u32)req->rq_peer.peer_nid);
 424                 break;
 425         default:
 426                 LBUG();
 427         }
 428
 429         tmp = lustre_msg_buf(req->rq_reqmsg, 2, sizeof conn);
 430         if (tmp == NULL)
 431                 GOTO(out, rc = -EPROTO);
 432
 433         memcpy(&conn, tmp, sizeof conn);
 434
 435         cfp = lustre_msg_buf(req->rq_reqmsg, 3, sizeof(unsigned long));
 436         LASSERT(cfp != NULL);
 437         connect_flags = *cfp;
 438
 439         rc = lustre_pack_reply(req, 0, NULL, NULL);
 440         if (rc)
 441                 GOTO(out, rc);
 442
 443         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL)
 444                 initial_conn = 1;
 445
 446         /* lctl gets a backstage, all-access pass. */
 447         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 448                 goto dont_check_exports;
 449
 450         spin_lock(&target->obd_dev_lock);
 451         list_for_each(p, &target->obd_exports) {
 452                 export = list_entry(p, struct obd_export, exp_obd_chain);
 453                 if (obd_uuid_equals(&cluuid, &export->exp_client_uuid)) {
 454                         spin_unlock(&target->obd_dev_lock);
 455                         LASSERT(export->exp_obd == target);
 456
 457                         rc = target_handle_reconnect(&conn, export, &cluuid,
 458                                                      initial_conn);
 459                         break;
 460                 }
 461                 export = NULL;
 462         }
 463         /* If we found an export, we already unlocked. */
 464         if (!export) {
 465                 spin_unlock(&target->obd_dev_lock);
 466         } else if (req->rq_export == NULL &&
 467                    atomic_read(&export->exp_rpc_count) > 0) {
 468                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
 469                       target->obd_name, cluuid.uuid,
 470                       ptlrpc_peernid2str(&req->rq_peer, peer_str),
 471                       export, atomic_read(&export->exp_refcount));
 472                 GOTO(out, rc = -EBUSY);
 473         } else if (req->rq_export != NULL &&
 474                    atomic_read(&export->exp_rpc_count) > 1) {
 475                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
 476                       target->obd_name, cluuid.uuid,
 477                       ptlrpc_peernid2str(&req->rq_peer, peer_str),
 478                       export, atomic_read(&export->exp_rpc_count));
 479                 GOTO(out, rc = -EBUSY);
 480         }
 481         else if (req->rq_reqmsg->conn_cnt == 1 && !initial_conn) {
 482                 CERROR("%s reconnected with 1 conn_cnt; cookies not random?\n",
 483                        cluuid.uuid);
 484                 GOTO(out, rc = -EALREADY);
 485         }
 486
 487         /* Tell the client if we're in recovery. */
 488         /* If this is the first client, start the recovery timer */
 489         CWARN("%s: connection from %s@%s/%lu %s\n", target->obd_name, cluuid.uuid,
 490               ptlrpc_peernid2str(&req->rq_peer, peer_str), *cfp,
 491               target->obd_recovering ? "(recovering)" : "");
 492         if (target->obd_recovering) {
 493                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 494                 target_start_recovery_timer(target);
 495         }
 496 #if 0
 497         /* Tell the client if we support replayable requests */
 498         if (target->obd_replayable)
 499                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 500 #endif
 501         if (export == NULL) {
 502                 if (target->obd_recovering) {
 503                         CERROR("denying connection for new client %s@%s: "
 504                                "%d clients in recovery for %lds\n", cluuid.uuid,
 505                                ptlrpc_peernid2str(&req->rq_peer, peer_str),
 506                                target->obd_recoverable_clients,
 507                                (target->obd_recovery_timer.expires-jiffies)/HZ);
 508                         rc = -EBUSY;
 509                 } else {
 510  dont_check_exports:
 511                         rc = obd_connect(&conn, target, &cluuid, connect_flags);
 512                 }
 513         }
 514         /* Tell the client if we support replayable requests */
 515         if (target->obd_replayable)
 516                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 517
 518         /* If all else goes well, this is our RPC return code. */
 519         req->rq_status = 0;
 520
 521         if (rc && rc != EALREADY)
 522                 GOTO(out, rc);
 523
 524         req->rq_repmsg->handle = conn;
 525
 526         /* If the client and the server are the same node, we will already
 527          * have an export that really points to the client's DLM export,
 528          * because we have a shared handles table.
 529          *
 530          * XXX this will go away when shaver stops sending the "connect" handle
 531          * in the real "remote handle" field of the request --phik 24 Apr 2003
 532          */
 533         if (req->rq_export != NULL)
 534                 class_export_put(req->rq_export);
 535
 536         /* ownership of this export ref transfers to the request */
 537         export = req->rq_export = class_conn2export(&conn);
 538         LASSERT(export != NULL);
 539
 540         spin_lock_irqsave(&export->exp_lock, flags);
 541         if (initial_conn) {
 542                 req->rq_repmsg->conn_cnt = export->exp_conn_cnt + 1;
 543         } else if (export->exp_conn_cnt >= req->rq_reqmsg->conn_cnt) {
 544                 CERROR("%s@%s: already connected at a higher conn_cnt: %d > %d\n",
 545                        cluuid.uuid, ptlrpc_peernid2str(&req->rq_peer, peer_str),
 546                        export->exp_conn_cnt,
 547                        req->rq_reqmsg->conn_cnt);
 548                 spin_unlock_irqrestore(&export->exp_lock, flags);
 549                 GOTO(out, rc = -EALREADY);
 550         }
 551         export->exp_conn_cnt = req->rq_reqmsg->conn_cnt;
 552         spin_unlock_irqrestore(&export->exp_lock, flags);
 553
 554         /* request from liblustre? */
 555         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT)
 556                 export->exp_libclient = 1;
 557
 558         if (export->exp_connection != NULL)
 559                 ptlrpc_put_connection(export->exp_connection);
 560         export->exp_connection = ptlrpc_get_connection(&req->rq_peer,
 561                                                        &remote_uuid);
 562
 563         if (rc == EALREADY) {
 564                 /* We indicate the reconnection in a flag, not an error code. */
 565                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 566                 GOTO(out, rc = 0);
 567         }
 568
 569         if (target->obd_recovering) {
 570                 target->obd_connected_clients++;
 571         }
 572
 573         memcpy(&conn, lustre_msg_buf(req->rq_reqmsg, 2, sizeof conn),
 574                sizeof conn);
 575
 576         if (export->exp_imp_reverse != NULL)
 577                 class_destroy_import(export->exp_imp_reverse);
 578         revimp = export->exp_imp_reverse = class_new_import();
 579         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
 580         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
 581         revimp->imp_remote_handle = conn;
 582         revimp->imp_obd = target;
 583         revimp->imp_dlm_fake = 1;
 584         revimp->imp_state = LUSTRE_IMP_FULL;
 585         class_import_put(revimp);
 586
 587         rc = obd_connect_post(export);
 588 out:
 589         if (rc)
 590                 req->rq_status = rc;
 591         RETURN(rc);
 592 }
 593
 594 int target_handle_disconnect(struct ptlrpc_request *req)
 595 {
 596         struct obd_export *exp;
 597         int rc;
 598         ENTRY;
 599
 600         rc = lustre_pack_reply(req, 0, NULL, NULL);
 601         if (rc)
 602                 RETURN(rc);
 603
 604         /* keep the rq_export around so we can send the reply */
 605         exp = class_export_get(req->rq_export);
 606         req->rq_status = obd_disconnect(exp, 0);
 607         RETURN(0);
 608 }
 609
 610 void target_destroy_export(struct obd_export *exp)
 611 {
 612         /* exports created from last_rcvd data, and "fake"
 613            exports created by lctl don't have an import */
 614         if (exp->exp_imp_reverse != NULL)
 615                 class_destroy_import(exp->exp_imp_reverse);
 616
 617         /* We cancel locks at disconnect time, but this will catch any locks
 618          * granted in a race with recovery-induced disconnect. */
 619         if (exp->exp_obd->obd_namespace != NULL)
 620                 ldlm_cancel_locks_for_export(exp);
 621 }
 622
 623 /*
 624  * Recovery functions
 625  */
 626
 627 struct ptlrpc_request *
 628 ptlrpc_clone_req( struct ptlrpc_request *orig_req)
 629 {
 630         struct ptlrpc_request *copy_req;
 631         struct lustre_msg *copy_reqmsg;
 632
 633         OBD_ALLOC(copy_req, sizeof *copy_req);
 634         if (!copy_req)
 635                 return NULL;
 636         OBD_ALLOC(copy_reqmsg, orig_req->rq_reqlen);
 637         if (!copy_reqmsg){
 638                 OBD_FREE(copy_req, sizeof *copy_req);
 639                 return NULL;
 640         }
 641
 642         memcpy(copy_req, orig_req, sizeof *copy_req);
 643         memcpy(copy_reqmsg, orig_req->rq_reqmsg, orig_req->rq_reqlen);
 644         /* the copied req takes over the reply state */
 645         orig_req->rq_reply_state = NULL;
 646
 647         copy_req->rq_reqmsg = copy_reqmsg;
 648         class_export_get(copy_req->rq_export);
 649         INIT_LIST_HEAD(&copy_req->rq_list);
 650
 651         return copy_req;
 652 }
 653 void ptlrpc_free_clone( struct ptlrpc_request *req)
 654 {
 655         class_export_put(req->rq_export);
 656         list_del(&req->rq_list);
 657         OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 658         OBD_FREE(req, sizeof *req);
 659 }
 660
 661 static void abort_delayed_replies(struct obd_device *obd)
 662 {
 663         struct ptlrpc_request *req;
 664         struct list_head *tmp, *n;
 665         list_for_each_safe(tmp, n, &obd->obd_delayed_reply_queue) {
 666                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 667                 DEBUG_REQ(D_ERROR, req, "aborted:");
 668                 req->rq_status = -ENOTCONN;
 669                 req->rq_type = PTL_RPC_MSG_ERR;
 670                 ptlrpc_reply(req);
 671                 class_export_put(req->rq_export);
 672                 list_del(&req->rq_list);
 673                 OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 674                 OBD_FREE(req, sizeof *req);
 675         }
 676 }
 677
 678 static void abort_recovery_queue(struct obd_device *obd)
 679 {
 680         struct ptlrpc_request *req;
 681         struct list_head *tmp, *n;
 682         int rc;
 683
 684         list_for_each_safe(tmp, n, &obd->obd_recovery_queue) {
 685                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 686                 DEBUG_REQ(D_ERROR, req, "aborted:");
 687                 req->rq_status = -ENOTCONN;
 688                 req->rq_type = PTL_RPC_MSG_ERR;
 689                 rc = lustre_pack_reply(req, 0, NULL, NULL);
 690                 if (rc == 0) {
 691                         ptlrpc_reply(req);
 692                 } else {
 693                         DEBUG_REQ(D_ERROR, req,
 694                                   "packing failed for abort-reply; skipping");
 695                 }
 696                 list_del(&req->rq_list);
 697                 class_export_put(req->rq_export);
 698                 OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 699                 OBD_FREE(req, sizeof *req);
 700         }
 701 }
 702
 703 static void target_abort_recovery(void *data)
 704 {
 705         struct obd_device *obd = data;
 706         int rc;
 707
 708         CERROR("disconnecting clients and aborting recovery\n");
 709         LASSERT(!obd->obd_recovering);
 710
 711         class_disconnect_exports(obd, 0);
 712
 713         /* when recovery was aborted, cleanup orphans on mds and ost */
 714         if (OBT(obd) && OBP(obd, postrecov)) {
 715                 rc = OBP(obd, postrecov)(obd);
 716                 if (rc >= 0)
 717                         CWARN("Cleanup %d orphans after recovery was aborted\n",
 718                               rc);
 719                 else
 720                         CERROR("postrecov failed %d\n", rc);
 721         }
 722
 723         abort_delayed_replies(obd);
 724         abort_recovery_queue(obd);
 725         ptlrpc_run_recovery_over_upcall(obd);
 726 }
 727
 728 static void target_recovery_expired(unsigned long castmeharder)
 729 {
 730         struct obd_device *obd = (struct obd_device *)castmeharder;
 731         CERROR("recovery timed out, aborting\n");
 732         spin_lock_bh(&obd->obd_processing_task_lock);
 733         obd->obd_abort_recovery = 1;
 734         wake_up(&obd->obd_next_transno_waitq);
 735         spin_unlock_bh(&obd->obd_processing_task_lock);
 736 }
 737
 738
 739 /* obd_processing_task_lock should be held */
 740 void target_cancel_recovery_timer(struct obd_device *obd)
 741 {
 742         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
 743         del_timer(&obd->obd_recovery_timer);
 744 }
 745
 746 static void reset_recovery_timer(struct obd_device *obd)
 747 {
 748         spin_lock_bh(&obd->obd_processing_task_lock);
 749         if (!obd->obd_recovering) {
 750                 spin_unlock_bh(&obd->obd_processing_task_lock);
 751                 return;
 752         }
 753         CDEBUG(D_HA, "timer will expire in %u seconds\n",
 754                OBD_RECOVERY_TIMEOUT / HZ);
 755         mod_timer(&obd->obd_recovery_timer, jiffies + OBD_RECOVERY_TIMEOUT);
 756         spin_unlock_bh(&obd->obd_processing_task_lock);
 757 }
 758
 759
 760 /* Only start it the first time called */
 761 void target_start_recovery_timer(struct obd_device *obd)
 762 {
 763         spin_lock_bh(&obd->obd_processing_task_lock);
 764         if (!obd->obd_recovering || timer_pending(&obd->obd_recovery_timer)) {
 765                 spin_unlock_bh(&obd->obd_processing_task_lock);
 766                 return;
 767         }
 768         CWARN("%s: starting recovery timer (%us)\n", obd->obd_name,
 769                OBD_RECOVERY_TIMEOUT / HZ);
 770         obd->obd_recovery_timer.function = target_recovery_expired;
 771         obd->obd_recovery_timer.data = (unsigned long)obd;
 772         mod_timer(&obd->obd_recovery_timer, jiffies + OBD_RECOVERY_TIMEOUT);
 773         spin_unlock_bh(&obd->obd_processing_task_lock);
 774 }
 775
 776 static void target_finish_recovery(struct obd_device *obd)
 777 {
 778         struct list_head *tmp, *n;
 779         int rc2;
 780
 781         ldlm_reprocess_all_ns(obd->obd_namespace);
 782
 783         CWARN("%s: all clients recovered, calling postrecov\n",
 784               obd->obd_name);
 785         /* when recovery finished, cleanup orphans on mds and ost */
 786         if (OBT(obd) && OBP(obd, postrecov)) {
 787                 rc2 = OBP(obd, postrecov)(obd);
 788                 if (rc2 >= 0)
 789                         CWARN("%s: all clients recovered, %d MDS "
 790                               "orphans deleted\n", obd->obd_name, rc2);
 791                 else
 792                         CERROR("postrecov failed %d\n", rc2);
 793         }
 794
 795         CWARN("%s: recovery over, sending delayed replies\n",
 796               obd->obd_name);
 797         list_for_each_safe(tmp, n, &obd->obd_delayed_reply_queue) {
 798                 struct ptlrpc_request *req;
 799                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 800                 DEBUG_REQ(D_ERROR, req, "delayed:");
 801                 ptlrpc_reply(req);
 802                 ptlrpc_free_clone(req);
 803         }
 804         ptlrpc_run_recovery_over_upcall(obd);
 805 }
 806
 807 static int check_for_next_transno(struct obd_device *obd)
 808 {
 809         struct ptlrpc_request *req = NULL;
 810         int wake_up = 0, connected, completed, queue_len, max;
 811         __u64 next_transno, req_transno;
 812
 813         spin_lock_bh(&obd->obd_processing_task_lock);
 814         if (!list_empty(&obd->obd_recovery_queue)) {
 815                 req = list_entry(obd->obd_recovery_queue.next,
 816                                  struct ptlrpc_request, rq_list);
 817                 req_transno = req->rq_reqmsg->transno;
 818         } else {
 819                 req_transno = 0;
 820         }
 821
 822         max = obd->obd_max_recoverable_clients;
 823         connected = obd->obd_connected_clients;
 824         completed = max - obd->obd_recoverable_clients;
 825         queue_len = obd->obd_requests_queued_for_recovery;
 826         next_transno = obd->obd_next_recovery_transno;
 827
 828         CDEBUG(D_HA,"max: %d, connected: %d, completed: %d, queue_len: %d, "
 829                "req_transno: "LPU64", next_transno: "LPU64"\n",
 830                max, connected, completed, queue_len, req_transno, next_transno);
 831         if (obd->obd_abort_recovery) {
 832                 CDEBUG(D_HA, "waking for aborted recovery\n");
 833                 wake_up = 1;
 834         } else if (max == completed) {
 835                 CDEBUG(D_HA, "waking for completed recovery\n");
 836                 wake_up = 1;
 837         } else if (req_transno == next_transno) {
 838                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
 839                 wake_up = 1;
 840         } else if (queue_len + completed == max) {
 841                 LASSERT(req->rq_reqmsg->transno >= next_transno);
 842                 CDEBUG(D_ERROR,
 843                        "waking for skipped transno (skip: "LPD64
 844                        ", ql: %d, comp: %d, conn: %d, next: "LPD64")\n",
 845                        next_transno, queue_len, completed, max, req_transno);
 846                 obd->obd_next_recovery_transno = req_transno;
 847                 wake_up = 1;
 848         }
 849         spin_unlock_bh(&obd->obd_processing_task_lock);
 850
 851         return wake_up;
 852 }
 853
 854 static struct ptlrpc_request *
 855 target_next_replay_req(struct obd_device *obd)
 856 {
 857         struct l_wait_info lwi = { 0 };
 858         struct ptlrpc_request *req;
 859
 860         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
 861                obd->obd_next_recovery_transno);
 862         l_wait_event(obd->obd_next_transno_waitq,
 863                      check_for_next_transno(obd), &lwi);
 864
 865         spin_lock_bh(&obd->obd_processing_task_lock);
 866         if (obd->obd_abort_recovery) {
 867                 req = NULL;
 868         } else if (!list_empty(&obd->obd_recovery_queue)) {
 869                 req = list_entry(obd->obd_recovery_queue.next,
 870                                  struct ptlrpc_request, rq_list);
 871                 list_del_init(&req->rq_list);
 872                 obd->obd_requests_queued_for_recovery--;
 873         } else {
 874                 req = NULL;
 875         }
 876         spin_unlock_bh(&obd->obd_processing_task_lock);
 877         return req;
 878 }
 879
 880
 881 static int target_recovery_thread(void *arg)
 882 {
 883         struct obd_device *obd = arg;
 884         struct ptlrpc_request *req;
 885         struct target_recovery_data *trd = &obd->obd_recovery_data;
 886         unsigned long flags;
 887         ENTRY;
 888
 889         kportal_daemonize("tgt-recov");
 890
 891         SIGNAL_MASK_LOCK(current, flags);
 892         sigfillset(&current->blocked);
 893         RECALC_SIGPENDING;
 894         SIGNAL_MASK_UNLOCK(current, flags);
 895
 896         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
 897                current->pid);
 898         trd->trd_processing_task = current->pid;
 899
 900         obd->obd_recovering = 1;
 901         complete(&trd->trd_starting);
 902
 903         while (obd->obd_recovering) {
 904                 LASSERT(trd->trd_processing_task == current->pid);
 905                 req = target_next_replay_req(obd);
 906                 if (req != NULL) {
 907                         char peer_str[PTL_NALFMT_SIZE];
 908                         DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s: ",
 909                                   req->rq_reqmsg->transno,
 910                                   ptlrpc_peernid2str(&req->rq_peer, peer_str));
 911                         (void)trd->trd_recovery_handler(req);
 912                         obd->obd_replayed_requests++;
 913                         reset_recovery_timer(obd);
 914                         /* bug 1580: decide how to properly sync() in recovery*/
 915                         //mds_fsync_super(mds->mds_sb);
 916                         ptlrpc_free_clone(req);
 917                         spin_lock_bh(&obd->obd_processing_task_lock);
 918                         obd->obd_next_recovery_transno++;
 919                         spin_unlock_bh(&obd->obd_processing_task_lock);
 920                 } else {
 921                         /* recovery is over */
 922                         spin_lock_bh(&obd->obd_processing_task_lock);
 923                         obd->obd_recovering = 0;
 924                         target_cancel_recovery_timer(obd);
 925                         if (obd->obd_abort_recovery) {
 926                                 obd->obd_abort_recovery = 0;
 927                                 spin_unlock_bh(&obd->obd_processing_task_lock);
 928                                 target_abort_recovery(obd);
 929                         } else {
 930                                 LASSERT(obd->obd_recoverable_clients == 0);
 931                                 spin_unlock_bh(&obd->obd_processing_task_lock);
 932                                 target_finish_recovery(obd);
 933                         }
 934                 }
 935         }
 936
 937         trd->trd_processing_task = 0;
 938         complete(&trd->trd_finishing);
 939         return 0;
 940 }
 941
 942 int target_start_recovery_thread(struct obd_device *obd, svc_handler_t handler)
 943 {
 944         int rc = 0;
 945         struct target_recovery_data *trd = &obd->obd_recovery_data;
 946
 947         memset(trd, 0, sizeof(*trd));
 948         init_completion(&trd->trd_starting);
 949         init_completion(&trd->trd_finishing);
 950         trd->trd_recovery_handler = handler;
 951
 952         if (kernel_thread(target_recovery_thread, obd, 0) == 0)
 953                 wait_for_completion(&trd->trd_starting);
 954         else
 955                 rc = -ECHILD;
 956
 957         return rc;
 958 }
 959
 960 void target_stop_recovery_thread(struct obd_device *obd)
 961 {
 962         spin_lock_bh(&obd->obd_processing_task_lock);
 963         if (obd->obd_recovery_data.trd_processing_task > 0) {
 964                 struct target_recovery_data *trd = &obd->obd_recovery_data;
 965                 CERROR("%s: aborting recovery\n", obd->obd_name);
 966                 obd->obd_abort_recovery = 1;
 967                 wake_up(&obd->obd_next_transno_waitq);
 968                 spin_unlock_bh(&obd->obd_processing_task_lock);
 969                 wait_for_completion(&trd->trd_finishing);
 970         } else {
 971                 spin_unlock_bh(&obd->obd_processing_task_lock);
 972         }
 973 }
 974
 975 int target_queue_recovery_request(struct ptlrpc_request *req,
 976                                   struct obd_device *obd)
 977 {
 978         struct list_head *tmp;
 979         int inserted = 0;
 980         __u64 transno = req->rq_reqmsg->transno;
 981
 982         /* CAVEAT EMPTOR: The incoming request message has been swabbed
 983          * (i.e. buflens etc are in my own byte order), but type-dependent
 984          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
 985
 986         if (!transno) {
 987                 INIT_LIST_HEAD(&req->rq_list);
 988                 DEBUG_REQ(D_HA, req, "not queueing");
 989                 return 1;
 990         }
 991
 992
 993         /* If we're processing the queue, we want don't want to queue this
 994          * message.
 995          *
 996          * Also, if this request has a transno less than the one we're waiting
 997          * for, we should process it now.  It could (and currently always will)
 998          * be an open request for a descriptor that was opened some time ago.
 999          *
1000          * Also, a resent, replayed request that has already been
1001          * handled will pass through here and be processed immediately.
1002          */
1003         spin_lock_bh(&obd->obd_processing_task_lock);
1004         if (obd->obd_recovery_data.trd_processing_task == current->pid ||
1005             transno < obd->obd_next_recovery_transno) {
1006                 /* Processing the queue right now, don't re-add. */
1007                 lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
1008                 LASSERT(list_empty(&req->rq_list));
1009                 spin_unlock_bh(&obd->obd_processing_task_lock);
1010                 return 1;
1011         }
1012         spin_unlock_bh(&obd->obd_processing_task_lock);
1013
1014         /* A resent, replayed request that is still on the queue; just drop it.
1015            The queued request will handle this. */
1016         if ((lustre_msg_get_flags(req->rq_reqmsg) & (MSG_RESENT | MSG_REPLAY))
1017             == (MSG_RESENT | MSG_REPLAY)) {
1018                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
1019                 return 0;
1020         }
1021
1022         req = ptlrpc_clone_req(req);
1023         if (req == NULL)
1024                 return -ENOMEM;
1025
1026         spin_lock_bh(&obd->obd_processing_task_lock);
1027
1028         /* XXX O(n^2) */
1029         list_for_each(tmp, &obd->obd_recovery_queue) {
1030                 struct ptlrpc_request *reqiter =
1031                         list_entry(tmp, struct ptlrpc_request, rq_list);
1032
1033                 if (reqiter->rq_reqmsg->transno > transno) {
1034                         list_add_tail(&req->rq_list, &reqiter->rq_list);
1035                         inserted = 1;
1036                         break;
1037                 }
1038         }
1039
1040         if (!inserted) {
1041                 list_add_tail(&req->rq_list, &obd->obd_recovery_queue);
1042         }
1043
1044         obd->obd_requests_queued_for_recovery++;
1045         wake_up(&obd->obd_next_transno_waitq);
1046         spin_unlock_bh(&obd->obd_processing_task_lock);
1047
1048         return 0;
1049 }
1050
1051 struct obd_device * target_req2obd(struct ptlrpc_request *req)
1052 {
1053         return req->rq_export->exp_obd;
1054 }
1055
1056 int target_queue_final_reply(struct ptlrpc_request *req, int rc)
1057 {
1058         struct obd_device *obd = target_req2obd(req);
1059
1060         LASSERT ((rc == 0) == (req->rq_reply_state != NULL));
1061
1062         if (rc) {
1063                 /* Just like ptlrpc_error, but without the sending. */
1064                 rc = lustre_pack_reply(req, 0, NULL, NULL);
1065                 LASSERT(rc == 0); /* XXX handle this */
1066                 req->rq_type = PTL_RPC_MSG_ERR;
1067         }
1068
1069         LASSERT (!req->rq_reply_state->rs_difficult);
1070         LASSERT(list_empty(&req->rq_list));
1071
1072         req = ptlrpc_clone_req(req);
1073
1074         spin_lock_bh(&obd->obd_processing_task_lock);
1075
1076         list_add(&req->rq_list, &obd->obd_delayed_reply_queue);
1077
1078         /* only count the first "replay over" request from each
1079            export */
1080         if (req->rq_export->exp_replay_needed) {
1081                 --obd->obd_recoverable_clients;
1082                 req->rq_export->exp_replay_needed = 0;
1083                 CWARN("%s: %d recoverable clients remain\n",
1084                       obd->obd_name, obd->obd_recoverable_clients);
1085         }
1086         wake_up(&obd->obd_next_transno_waitq);
1087         spin_unlock_bh(&obd->obd_processing_task_lock);
1088         return 1;
1089 }
1090
1091 int
1092 target_send_reply_msg (struct ptlrpc_request *req, int rc, int fail_id)
1093 {
1094         if (OBD_FAIL_CHECK(fail_id | OBD_FAIL_ONCE)) {
1095                 obd_fail_loc |= OBD_FAIL_ONCE | OBD_FAILED;
1096                 DEBUG_REQ(D_ERROR, req, "dropping reply");
1097                 /* NB this does _not_ send with ACK disabled, to simulate
1098                  * sending OK, but timing out for the ACK */
1099                 if (req->rq_reply_state != NULL) {
1100                         if (!req->rq_reply_state->rs_difficult) {
1101                                 lustre_free_reply_state (req->rq_reply_state);
1102                                 req->rq_reply_state = NULL;
1103                         } else {
1104                                 struct ptlrpc_service *svc =
1105                                         req->rq_rqbd->rqbd_srv_ni->sni_service;
1106                                 atomic_inc(&svc->srv_outstanding_replies);
1107                         }
1108                 }
1109                 return (-ECOMM);
1110         }
1111
1112         if (rc) {
1113                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
1114                 if (req->rq_reply_state == NULL) {
1115                         rc = lustre_pack_reply (req, 0, NULL, NULL);
1116                         if (rc != 0) {
1117                                 CERROR ("can't allocate reply\n");
1118                                 return (rc);
1119                         }
1120                 }
1121                 req->rq_type = PTL_RPC_MSG_ERR;
1122         } else {
1123                 DEBUG_REQ(D_NET, req, "sending reply");
1124         }
1125
1126         return (ptlrpc_send_reply(req, 1));
1127 }
1128
1129 void
1130 target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
1131 {
1132         int                        netrc;
1133         unsigned long              flags;
1134         struct ptlrpc_reply_state *rs;
1135         struct obd_device         *obd;
1136         struct obd_export         *exp;
1137         struct ptlrpc_srv_ni      *sni;
1138         struct ptlrpc_service     *svc;
1139
1140         sni = req->rq_rqbd->rqbd_srv_ni;
1141         svc = sni->sni_service;
1142
1143         rs = req->rq_reply_state;
1144         if (rs == NULL || !rs->rs_difficult) {
1145                 /* The easy case; no notifiers and reply_out_callback()
1146                  * cleans up (i.e. we can't look inside rs after a
1147                  * successful send) */
1148                 netrc = target_send_reply_msg (req, rc, fail_id);
1149
1150                 LASSERT (netrc == 0 || req->rq_reply_state == NULL);
1151                 return;
1152         }
1153
1154         /* must be an export if locks saved */
1155         LASSERT (req->rq_export != NULL);
1156         /* req/reply consistent */
1157         LASSERT (rs->rs_srv_ni == sni);
1158
1159         /* "fresh" reply */
1160         LASSERT (!rs->rs_scheduled);
1161         LASSERT (!rs->rs_scheduled_ever);
1162         LASSERT (!rs->rs_handled);
1163         LASSERT (!rs->rs_on_net);
1164         LASSERT (rs->rs_export == NULL);
1165         LASSERT (list_empty(&rs->rs_obd_list));
1166         LASSERT (list_empty(&rs->rs_exp_list));
1167
1168         exp = class_export_get (req->rq_export);
1169         obd = exp->exp_obd;
1170
1171         /* disable reply scheduling onto srv_reply_queue while I'm setting up */
1172         rs->rs_scheduled = 1;
1173         rs->rs_on_net    = 1;
1174         rs->rs_xid       = req->rq_xid;
1175         rs->rs_transno   = req->rq_transno;
1176         rs->rs_export    = exp;
1177
1178         spin_lock_irqsave (&obd->obd_uncommitted_replies_lock, flags);
1179
1180         if (rs->rs_transno > obd->obd_last_committed) {
1181                 /* not committed already */
1182                 list_add_tail (&rs->rs_obd_list,
1183                                &obd->obd_uncommitted_replies);
1184         }
1185
1186         spin_unlock (&obd->obd_uncommitted_replies_lock);
1187         spin_lock (&exp->exp_lock);
1188
1189         list_add_tail (&rs->rs_exp_list, &exp->exp_outstanding_replies);
1190
1191         spin_unlock_irqrestore (&exp->exp_lock, flags);
1192
1193         netrc = target_send_reply_msg (req, rc, fail_id);
1194
1195         spin_lock_irqsave (&svc->srv_lock, flags);
1196
1197         svc->srv_n_difficult_replies++;
1198
1199         if (netrc != 0) /* error sending: reply is off the net */
1200                 rs->rs_on_net = 0;
1201
1202         if (!rs->rs_on_net ||                   /* some notifier */
1203             list_empty(&rs->rs_exp_list) ||     /* completed already */
1204             list_empty(&rs->rs_obd_list)) {
1205                 list_add_tail (&rs->rs_list, &svc->srv_reply_queue);
1206                 wake_up (&svc->srv_waitq);
1207         } else {
1208                 list_add (&rs->rs_list, &sni->sni_active_replies);
1209                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
1210         }
1211
1212         spin_unlock_irqrestore (&svc->srv_lock, flags);
1213 }
1214
1215 int target_handle_ping(struct ptlrpc_request *req)
1216 {
1217         return lustre_pack_reply(req, 0, NULL, NULL);
1218 }