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 #include <linux/lustre_sec.h>
  39 #include <linux/lustre_gs.h>
  40
  41 /* @priority: if non-zero, move the selected to the list head
  42  * @nocreate: if non-zero, only search in existed connections
  43  */
  44 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  45                            int priority, int nocreate)
  46 {
  47         struct ptlrpc_connection *ptlrpc_conn;
  48         struct obd_import_conn *imp_conn = NULL, *item;
  49         int rc = 0;
  50         ENTRY;
  51
  52         LASSERT(!(nocreate && !priority));
  53
  54         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
  55         if (!ptlrpc_conn) {
  56                 CERROR("can't find connection %s\n", uuid->uuid);
  57                 RETURN (-EINVAL);
  58         }
  59
  60         if (!nocreate) {
  61                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  62                 if (!imp_conn) {
  63                         CERROR("fail to alloc memory\n");
  64                         GOTO(out_put, rc = -ENOMEM);
  65                 }
  66         }
  67
  68         spin_lock(&imp->imp_lock);
  69         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  70                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  71                         if (priority) {
  72                                 list_del(&item->oic_item);
  73                                 list_add(&item->oic_item, &imp->imp_conn_list);
  74                                 item->oic_last_attempt = 0;
  75                         }
  76                         CDEBUG(D_HA, "imp %p@%s: find existed conn %s%s\n",
  77                                imp, imp->imp_obd->obd_name, uuid->uuid,
  78                                (priority ? ", move to head." : ""));
  79                         spin_unlock(&imp->imp_lock);
  80                         GOTO(out_free, rc = 0);
  81                 }
  82         }
  83         /* not found */
  84         if (!nocreate) {
  85                 imp_conn->oic_conn = ptlrpc_conn;
  86                 imp_conn->oic_uuid = *uuid;
  87                 imp_conn->oic_last_attempt = 0;
  88                 if (priority)
  89                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
  90                 else
  91                         list_add_tail(&imp_conn->oic_item, &imp->imp_conn_list);
  92                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
  93                        imp, imp->imp_obd->obd_name, uuid->uuid,
  94                        (priority ? "head" : "tail"));
  95         } else
  96                 rc = -ENOENT;
  97
  98         spin_unlock(&imp->imp_lock);
  99         RETURN(0);
 100 out_free:
 101         if (imp_conn)
 102                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 103 out_put:
 104         ptlrpc_put_connection(ptlrpc_conn);
 105         RETURN(rc);
 106 }
 107
 108 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 109 {
 110         return import_set_conn(imp, uuid, 1, 1);
 111 }
 112
 113 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 114                            int priority)
 115 {
 116         return import_set_conn(imp, uuid, priority, 0);
 117 }
 118
 119 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 120 {
 121         struct obd_import_conn *imp_conn;
 122         struct obd_export *dlmexp;
 123         int rc = -ENOENT;
 124         ENTRY;
 125
 126         spin_lock(&imp->imp_lock);
 127         if (list_empty(&imp->imp_conn_list)) {
 128                 LASSERT(!imp->imp_conn_current);
 129                 LASSERT(!imp->imp_connection);
 130                 GOTO(out, rc);
 131         }
 132
 133         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 134                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 135                         continue;
 136                 LASSERT(imp_conn->oic_conn);
 137
 138                 /* is current conn? */
 139                 if (imp_conn == imp->imp_conn_current) {
 140                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 141
 142                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 143                             imp->imp_state != LUSTRE_IMP_DISCON) {
 144                                 CERROR("can't remove current connection\n");
 145                                 GOTO(out, rc = -EBUSY);
 146                         }
 147
 148                         ptlrpc_put_connection(imp->imp_connection);
 149                         imp->imp_connection = NULL;
 150
 151                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 152                         if (dlmexp && dlmexp->exp_connection) {
 153                                 LASSERT(dlmexp->exp_connection ==
 154                                         imp_conn->oic_conn);
 155                                 ptlrpc_put_connection(dlmexp->exp_connection);
 156                                 dlmexp->exp_connection = NULL;
 157                         }
 158                 }
 159
 160                 list_del(&imp_conn->oic_item);
 161                 ptlrpc_put_connection(imp_conn->oic_conn);
 162                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 163                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 164                        imp, imp->imp_obd->obd_name, uuid->uuid);
 165                 rc = 0;
 166                 break;
 167         }
 168 out:
 169         spin_unlock(&imp->imp_lock);
 170         if (rc == -ENOENT)
 171                 CERROR("connection %s not found\n", uuid->uuid);
 172         RETURN(rc);
 173 }
 174
 175 int client_obd_setup(struct obd_device *obddev, obd_count len, void *buf)
 176 {
 177         struct lustre_cfg* lcfg = buf;
 178         struct client_obd *cli = &obddev->u.cli;
 179         struct obd_import *imp;
 180         struct obd_uuid server_uuid;
 181         int rq_portal, rp_portal, connect_op;
 182         char *name = obddev->obd_type->typ_name;
 183         char *mgmt_name = NULL;
 184         int rc;
 185         ENTRY;
 186
 187         /* In a more perfect world, we would hang a ptlrpc_client off of
 188          * obd_type and just use the values from there. */
 189         if (!strcmp(name, OBD_OSC_DEVICENAME)) {
 190                 rq_portal = OST_REQUEST_PORTAL;
 191                 rp_portal = OSC_REPLY_PORTAL;
 192                 connect_op = OST_CONNECT;
 193         } else if (!strcmp(name, OBD_MDC_DEVICENAME)) {
 194                 rq_portal = MDS_REQUEST_PORTAL;
 195                 rp_portal = MDC_REPLY_PORTAL;
 196                 connect_op = MDS_CONNECT;
 197         } else if (!strcmp(name, OBD_MGMTCLI_DEVICENAME)) {
 198                 rq_portal = MGMT_REQUEST_PORTAL;
 199                 rp_portal = MGMT_REPLY_PORTAL;
 200                 connect_op = MGMT_CONNECT;
 201         } else if (!strcmp(name, LUSTRE_GKC_NAME)) {
 202                 rq_portal = GKS_REQUEST_PORTAL;
 203                 rp_portal = GKC_REPLY_PORTAL;
 204                 connect_op = GKS_CONNECT;
 205
 206         } else {
 207                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 208                        name);
 209                 RETURN(-EINVAL);
 210         }
 211
 212
 213         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 214                 CERROR("requires a TARGET UUID\n");
 215                 RETURN(-EINVAL);
 216         }
 217
 218         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 219                 CERROR("client UUID must be less than 38 characters\n");
 220                 RETURN(-EINVAL);
 221         }
 222
 223         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 224                 CERROR("setup requires a SERVER UUID\n");
 225                 RETURN(-EINVAL);
 226         }
 227
 228         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 229                 CERROR("target UUID must be less than 38 characters\n");
 230                 RETURN(-EINVAL);
 231         }
 232
 233         sema_init(&cli->cl_sem, 1);
 234         cli->cl_conn_count = 0;
 235         memcpy(server_uuid.uuid,  lustre_cfg_buf(lcfg, 2),
 236                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 237                sizeof(server_uuid)));
 238
 239         cli->cl_dirty = 0;
 240         cli->cl_avail_grant = 0;
 241
 242         /* FIXME: should limit this for the sum of all cl_dirty_max */
 243         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 244         if (cli->cl_dirty_max >> PAGE_SHIFT > num_physpages / 8)
 245                 cli->cl_dirty_max = num_physpages << (PAGE_SHIFT - 3);
 246
 247         INIT_LIST_HEAD(&cli->cl_cache_waiters);
 248         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 249         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 250         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 251         spin_lock_init(&cli->cl_loi_list_lock);
 252         cli->cl_r_in_flight = 0;
 253         cli->cl_w_in_flight = 0;
 254         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 255         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 256         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 257         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 258
 259         memset(&cli->cl_last_write_time, 0,
 260                sizeof(cli->cl_last_write_time));
 261
 262         cli->cl_write_gap_sum = 0;
 263         cli->cl_write_gaps = 0;
 264         cli->cl_write_num = 0;
 265         cli->cl_read_num = 0;
 266         cli->cl_cache_wait_num = 0;
 267         cli->cl_cache_wait_sum = 0;
 268
 269         cli->cl_dirty_num = 0;
 270         cli->cl_dirty_sum = 0;
 271         cli->cl_dirty_av = 0;
 272         cli->cl_dirty_dmax = 0;
 273         cli->cl_dirty_dmin = 0;
 274         cli->cl_sync_rpcs = 0;
 275
 276         if (num_physpages >> (20 - PAGE_SHIFT) <= 128) { /* <= 128 MB */
 277                 cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES / 4;
 278                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT / 4;
 279 #if 0
 280         } else if (num_physpages >> (20 - PAGE_SHIFT) <= 512) { /* <= 512 MB */
 281                 cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES / 2;
 282                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT / 2;
 283 #endif
 284         } else {
 285                 cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 286                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 287         }
 288
 289         rc = ldlm_get_ref();
 290         if (rc) {
 291                 CERROR("ldlm_get_ref failed: %d\n", rc);
 292                 GOTO(err, rc);
 293         }
 294
 295         ptlrpc_init_client(rq_portal, rp_portal, name,
 296                            &obddev->obd_ldlm_client);
 297
 298         imp = class_new_import();
 299         if (imp == NULL)
 300                 GOTO(err_ldlm, rc = -ENOENT);
 301         imp->imp_client = &obddev->obd_ldlm_client;
 302         imp->imp_obd = obddev;
 303         imp->imp_connect_op = connect_op;
 304         imp->imp_generation = 0;
 305         imp->imp_initial_recov = 1;
 306         INIT_LIST_HEAD(&imp->imp_pinger_chain);
 307         memcpy(imp->imp_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 308                LUSTRE_CFG_BUFLEN(lcfg, 1));
 309         class_import_put(imp);
 310
 311         rc = client_import_add_conn(imp, &server_uuid, 1);
 312         if (rc) {
 313                 CERROR("can't add initial connection\n");
 314                 GOTO(err_import, rc);
 315         }
 316
 317         cli->cl_import = imp;
 318         cli->cl_max_mds_easize = sizeof(struct lov_mds_md);
 319         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 320         cli->cl_sandev = to_kdev_t(0);
 321
 322         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 323                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 324                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 325                                name, obddev->obd_name,
 326                                imp->imp_target_uuid.uuid);
 327                         imp->imp_invalid = 1;
 328
 329                         if (LUSTRE_CFG_BUFLEN(lcfg, 4) > 0)
 330                                 mgmt_name = lustre_cfg_string(lcfg, 4);
 331                 } else {
 332                         mgmt_name = lustre_cfg_string(lcfg, 3);
 333                 }
 334         }
 335 #if 0
 336         if (mgmt_name != NULL) {
 337                 /* Register with management client if we need to. */
 338                 CDEBUG(D_HA, "%s registering with %s for events about %s\n",
 339                        obddev->obd_name, mgmt_name, server_uuid.uuid);
 340
 341                 mgmt_obd = class_name2obd(mgmt_name);
 342                 if (!mgmt_obd) {
 343                         CERROR("can't find mgmtcli %s to register\n",
 344                                mgmt_name);
 345                         GOTO(err_import, rc = -ENOSYS);
 346                 }
 347
 348                 register_f = (mgmtcli_register_for_events_t)symbol_get("mgmtcli_register_for_events");
 349                 if (!register_f) {
 350                         CERROR("can't i_m_g mgmtcli_register_for_events\n");
 351                         GOTO(err_import, rc = -ENOSYS);
 352                 }
 353
 354                 rc = register_f(mgmt_obd, obddev, &imp->imp_target_uuid);
 355                 symbol_put("mgmtcli_register_for_events");
 356
 357                 if (!rc)
 358                         cli->cl_mgmtcli_obd = mgmt_obd;
 359         }
 360 #endif
 361         RETURN(rc);
 362
 363 err_import:
 364         class_destroy_import(imp);
 365 err_ldlm:
 366         ldlm_put_ref(0);
 367 err:
 368         RETURN(rc);
 369
 370 }
 371
 372 int client_obd_cleanup(struct obd_device *obddev, int flags)
 373 {
 374         struct client_obd *cli = &obddev->u.cli;
 375         ENTRY;
 376
 377         if (!cli->cl_import)
 378                 RETURN(-EINVAL);
 379
 380         if (cli->cl_mgmtcli_obd) {
 381                 mgmtcli_deregister_for_events_t dereg_f;
 382
 383                 dereg_f = (mgmtcli_deregister_for_events_t)symbol_get("mgmtcli_deregister_for_events");
 384                 dereg_f(cli->cl_mgmtcli_obd, obddev);
 385                 symbol_put("mgmtcli_deregister_for_events");
 386         }
 387
 388         if (cli->cl_write_gaps) {
 389                 CWARN("%s: [writes num: %lu, reads num: %lu]: %lu write gaps: %lu "
 390                       "av. (usec), %lu total (usec), %lu rpcs falled back to sync\n",
 391                       obddev->obd_name, cli->cl_write_num, cli->cl_read_num,
 392                       cli->cl_write_gaps, cli->cl_write_gap_sum / cli->cl_write_gaps,
 393                       cli->cl_write_gap_sum, cli->cl_sync_rpcs);
 394         }
 395
 396         if (cli->cl_cache_wait_num) {
 397                 CWARN("%s: [cache waits num: %lu]: cache wait av. %lu (usec)\n",
 398                       obddev->obd_name, cli->cl_cache_wait_num,
 399                       cli->cl_cache_wait_sum / cli->cl_cache_wait_num);
 400         }
 401
 402         if (cli->cl_dirty_av) {
 403                 CWARN("%s: pipe loading av. %lu (b), max pipe room %lu (b), pipe "
 404                       "loading av. ratio %lu%%, pipe dirty max %lu (b), pipe dirty "
 405                       "min %lu (b), pipe loading max ratio %lu%%\n", obddev->obd_name,
 406                       cli->cl_dirty_av, cli->cl_dirty_max,
 407                       (cli->cl_dirty_av * 100) / cli->cl_dirty_max,
 408                       cli->cl_dirty_dmax, cli->cl_dirty_dmin,
 409                       (cli->cl_dirty_dmax * 100) / cli->cl_dirty_max);
 410         }
 411
 412         /* Here we try to drop the security structure after destroy import,
 413          * to avoid issue of "sleep in spinlock".
 414          */
 415         class_import_get(cli->cl_import);
 416         class_destroy_import(cli->cl_import);
 417         ptlrpcs_import_drop_sec(cli->cl_import);
 418         class_import_put(cli->cl_import);
 419         cli->cl_import = NULL;
 420
 421         ldlm_put_ref(flags & OBD_OPT_FORCE);
 422         RETURN(0);
 423 }
 424
 425 int client_connect_import(struct lustre_handle *dlm_handle,
 426                           struct obd_device *obd,
 427                           struct obd_uuid *cluuid,
 428                           struct obd_connect_data *conn_data,
 429                           unsigned long connect_flags)
 430 {
 431         struct client_obd *cli = &obd->u.cli;
 432         struct obd_import *imp = cli->cl_import;
 433         struct obd_export *exp;
 434         int rc;
 435         ENTRY;
 436
 437         down(&cli->cl_sem);
 438         rc = class_connect(dlm_handle, obd, cluuid);
 439         if (rc)
 440                 GOTO(out_sem, rc);
 441
 442         cli->cl_conn_count++;
 443         if (cli->cl_conn_count > 1)
 444                 GOTO(out_sem, rc);
 445         exp = class_conn2export(dlm_handle);
 446
 447         if (obd->obd_namespace != NULL)
 448                 CERROR("already have namespace!\n");
 449         obd->obd_namespace = ldlm_namespace_new(obd->obd_name,
 450                                                 LDLM_NAMESPACE_CLIENT);
 451         if (obd->obd_namespace == NULL)
 452                 GOTO(out_disco, rc = -ENOMEM);
 453
 454         rc = ptlrpcs_import_get_sec(imp);
 455         if (rc != 0)
 456                 GOTO(out_ldlm, rc);
 457
 458         imp->imp_dlm_handle = *dlm_handle;
 459         rc = ptlrpc_init_import(imp);
 460         if (rc != 0)
 461                 GOTO(out_ldlm, rc);
 462
 463         imp->imp_connect_flags = connect_flags;
 464         if (conn_data)
 465                 memcpy(&imp->imp_connect_data, conn_data, sizeof(*conn_data));
 466
 467         rc = ptlrpc_connect_import(imp, NULL);
 468         if (rc != 0) {
 469                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 470                 GOTO(out_ldlm, rc);
 471         }
 472         LASSERT(exp->exp_connection);
 473         ptlrpc_pinger_add_import(imp);
 474         EXIT;
 475
 476         if (rc) {
 477 out_ldlm:
 478                 ldlm_namespace_free(obd->obd_namespace, 0);
 479                 obd->obd_namespace = NULL;
 480 out_disco:
 481                 cli->cl_conn_count--;
 482                 class_disconnect(exp, 0);
 483         } else {
 484                 class_export_put(exp);
 485         }
 486 out_sem:
 487         up(&cli->cl_sem);
 488         return rc;
 489 }
 490
 491 int client_disconnect_export(struct obd_export *exp, unsigned long flags)
 492 {
 493         struct obd_device *obd = class_exp2obd(exp);
 494         struct client_obd *cli = &obd->u.cli;
 495         struct obd_import *imp = cli->cl_import;
 496         int rc = 0, err;
 497         ENTRY;
 498
 499         if (!obd) {
 500                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 501                        exp, exp ? exp->exp_handle.h_cookie : -1);
 502                 RETURN(-EINVAL);
 503         }
 504
 505         down(&cli->cl_sem);
 506         if (!cli->cl_conn_count) {
 507                 CERROR("disconnecting disconnected device (%s)\n",
 508                        obd->obd_name);
 509                 GOTO(out_sem, rc = -EINVAL);
 510         }
 511
 512         cli->cl_conn_count--;
 513         if (cli->cl_conn_count)
 514                 GOTO(out_no_disconnect, rc = 0);
 515
 516         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 517          * delete it regardless.  (It's safe to delete an import that was
 518          * never added.) */
 519         (void)ptlrpc_pinger_del_import(imp);
 520
 521         if (obd->obd_namespace != NULL) {
 522                 /* obd_no_recov == local only */
 523                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 524                                        obd->obd_no_recov, NULL);
 525                 ldlm_namespace_free(obd->obd_namespace, obd->obd_no_recov);
 526                 obd->obd_namespace = NULL;
 527         }
 528
 529         /*
 530          * Yeah, obd_no_recov also (mainly) means "forced shutdown".
 531          */
 532         if (obd->obd_no_recov)
 533                 ptlrpc_invalidate_import(imp, 0);
 534         else
 535                 rc = ptlrpc_disconnect_import(imp);
 536
 537         EXIT;
 538  out_no_disconnect:
 539         err = class_disconnect(exp, 0);
 540         if (!rc && err)
 541                 rc = err;
 542  out_sem:
 543         up(&cli->cl_sem);
 544         RETURN(rc);
 545 }
 546
 547 /* --------------------------------------------------------------------------
 548  * from old lib/target.c
 549  * -------------------------------------------------------------------------- */
 550
 551 int target_handle_reconnect(struct lustre_handle *conn, struct obd_export *exp,
 552                             struct obd_uuid *cluuid, int initial_conn)
 553 {
 554         if (exp->exp_connection && !initial_conn) {
 555                 struct lustre_handle *hdl;
 556                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 557                 /* Might be a re-connect after a partition. */
 558                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 559                         CERROR("%s reconnecting\n", cluuid->uuid);
 560                         conn->cookie = exp->exp_handle.h_cookie;
 561                         RETURN(EALREADY);
 562                 } else {
 563                         CERROR("%s reconnecting from %s, "
 564                                "handle mismatch (ours "LPX64", theirs "
 565                                LPX64")\n", cluuid->uuid,
 566                                exp->exp_connection->c_remote_uuid.uuid,
 567                                hdl->cookie, conn->cookie);
 568                         memset(conn, 0, sizeof *conn);
 569                         RETURN(-EALREADY);
 570                 }
 571         }
 572
 573         conn->cookie = exp->exp_handle.h_cookie;
 574         CDEBUG(D_INFO, "existing export for UUID '%s' at %p\n",
 575                cluuid->uuid, exp);
 576         CDEBUG(D_IOCTL,"connect: cookie "LPX64"\n", conn->cookie);
 577         RETURN(0);
 578 }
 579
 580 static inline int ptlrpc_peer_is_local(struct ptlrpc_peer *peer)
 581 {
 582         ptl_process_id_t myid;
 583
 584         PtlGetId(peer->peer_ni->pni_ni_h, &myid);
 585         return (memcmp(&peer->peer_id, &myid, sizeof(myid)) == 0);
 586 }
 587
 588 /* To check whether the p_flavor is in deny list or not
 589  * rc:
 590  *      0           not found, pass
 591  *      EPERM       found, refuse
 592  */
 593
 594 static int check_deny_list(struct list_head *head, __u32 flavor)
 595 {
 596         deny_sec_t *p_deny_sec = NULL;
 597         deny_sec_t *n_deny_sec = NULL;
 598
 599         list_for_each_entry_safe(p_deny_sec, n_deny_sec, head, list) {
 600                 if (p_deny_sec->flavor == flavor)
 601                         return -EPERM;
 602         }
 603         return 0;
 604 }
 605
 606 int target_check_deny_sec(struct obd_device *target, struct ptlrpc_request *req)
 607 {
 608         __u32 flavor;
 609         int rc = 0;
 610
 611         flavor = req->rq_req_secflvr;
 612
 613         if (!strcmp(target->obd_type->typ_name, OBD_MDS_DEVICENAME)) {
 614                 spin_lock(&target->u.mds.mds_denylist_lock);
 615                 rc = check_deny_list(&target->u.mds.mds_denylist, flavor);
 616                 spin_unlock(&target->u.mds.mds_denylist_lock);
 617         } else if (!strcmp(target->obd_type->typ_name, OBD_FILTER_DEVICENAME)) {
 618                 spin_lock(&target->u.filter.fo_denylist_lock);
 619                 rc = check_deny_list(&target->u.filter.fo_denylist, flavor);
 620                 spin_unlock(&target->u.filter.fo_denylist_lock);
 621         }
 622
 623         return rc;
 624 }
 625
 626 int target_handle_connect(struct ptlrpc_request *req)
 627 {
 628         unsigned long connect_flags = 0, *cfp;
 629         struct obd_device *target;
 630         struct obd_export *export = NULL;
 631         struct obd_import *revimp;
 632         struct lustre_handle conn;
 633         struct obd_uuid tgtuuid;
 634         struct obd_uuid cluuid;
 635         struct obd_uuid remote_uuid;
 636         struct list_head *p;
 637         struct obd_connect_data *conn_data;
 638         int conn_data_size = sizeof(*conn_data);
 639         char *str, *tmp;
 640         int rc = 0;
 641         unsigned long flags;
 642         int initial_conn = 0;
 643         char peer_str[PTL_NALFMT_SIZE];
 644         const int offset = 1;
 645         ENTRY;
 646
 647         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 648
 649         LASSERT_REQSWAB (req, offset + 0);
 650         str = lustre_msg_string(req->rq_reqmsg, offset + 0,
 651                                 sizeof(tgtuuid) - 1);
 652         if (str == NULL) {
 653                 CERROR("bad target UUID for connect\n");
 654                 GOTO(out, rc = -EINVAL);
 655         }
 656
 657         obd_str2uuid (&tgtuuid, str);
 658         target = class_uuid2obd(&tgtuuid);
 659         if (!target)
 660                 target = class_name2obd(str);
 661
 662         if (!target || target->obd_stopping || !target->obd_set_up) {
 663                 CERROR("UUID '%s' is not available for connect from %s\n",
 664                        str, req->rq_peerstr);
 665                 GOTO(out, rc = -ENODEV);
 666         }
 667
 668         /* check the secure deny list of mds/ost */
 669         rc = target_check_deny_sec(target, req);
 670         if (rc != 0)
 671                 GOTO(out, rc);
 672
 673         LASSERT_REQSWAB (req, offset + 1);
 674         str = lustre_msg_string(req->rq_reqmsg, offset + 1, sizeof(cluuid) - 1);
 675         if (str == NULL) {
 676                 CERROR("bad client UUID for connect\n");
 677                 GOTO(out, rc = -EINVAL);
 678         }
 679
 680         obd_str2uuid (&cluuid, str);
 681
 682         /* XXX extract a nettype and format accordingly */
 683         switch (sizeof(ptl_nid_t)) {
 684                 /* NB the casts only avoid compiler warnings */
 685         case 8:
 686                 snprintf((char *)remote_uuid.uuid, sizeof(remote_uuid),
 687                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.peer_id.nid);
 688                 break;
 689         case 4:
 690                 snprintf((char *)remote_uuid.uuid, sizeof(remote_uuid),
 691                          "NET_%x_UUID", (__u32)req->rq_peer.peer_id.nid);
 692                 break;
 693         default:
 694                 LBUG();
 695         }
 696
 697         tmp = lustre_msg_buf(req->rq_reqmsg, offset + 2, sizeof(conn));
 698         if (tmp == NULL)
 699                 GOTO(out, rc = -EPROTO);
 700
 701         memcpy(&conn, tmp, sizeof conn);
 702
 703         cfp = lustre_msg_buf(req->rq_reqmsg, offset + 3, sizeof(unsigned long));
 704         LASSERT(cfp != NULL);
 705         connect_flags = *cfp;
 706
 707         conn_data = lustre_swab_reqbuf(req, offset + 4, sizeof(*conn_data),
 708                                        lustre_swab_connect);
 709         if (!conn_data)
 710                 GOTO(out, rc = -EPROTO);
 711
 712         rc = lustre_pack_reply(req, 1, &conn_data_size, NULL);
 713         if (rc)
 714                 GOTO(out, rc);
 715
 716         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL)
 717                 initial_conn = 1;
 718
 719         /* lctl gets a backstage, all-access pass. */
 720         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 721                 goto dont_check_exports;
 722
 723         spin_lock(&target->obd_dev_lock);
 724         list_for_each(p, &target->obd_exports) {
 725                 export = list_entry(p, struct obd_export, exp_obd_chain);
 726                 if (obd_uuid_equals(&cluuid, &export->exp_client_uuid)) {
 727                         spin_unlock(&target->obd_dev_lock);
 728                         LASSERT(export->exp_obd == target);
 729
 730                         rc = target_handle_reconnect(&conn, export, &cluuid,
 731                                                      initial_conn);
 732                         break;
 733                 }
 734                 export = NULL;
 735         }
 736         /* If we found an export, we already unlocked. */
 737         if (!export) {
 738                 spin_unlock(&target->obd_dev_lock);
 739         } else if (req->rq_export == NULL &&
 740                    atomic_read(&export->exp_rpc_count) > 0) {
 741                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
 742                       target->obd_name, cluuid.uuid,
 743                       ptlrpc_peernid2str(&req->rq_peer, peer_str),
 744                       export, atomic_read(&export->exp_refcount));
 745                 GOTO(out, rc = -EBUSY);
 746         } else if (req->rq_export != NULL &&
 747                    atomic_read(&export->exp_rpc_count) > 1) {
 748                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
 749                       target->obd_name, cluuid.uuid,
 750                       ptlrpc_peernid2str(&req->rq_peer, peer_str),
 751                       export, atomic_read(&export->exp_rpc_count));
 752                 GOTO(out, rc = -EBUSY);
 753         } else if (req->rq_reqmsg->conn_cnt == 1 && !initial_conn) {
 754                 CERROR("%s reconnected with 1 conn_cnt; cookies not random?\n",
 755                        cluuid.uuid);
 756                 GOTO(out, rc = -EALREADY);
 757         }
 758
 759         /* Tell the client if we're in recovery. */
 760         /* If this is the first client, start the recovery timer */
 761         CWARN("%s: connection from %s@%s/%lu %st"LPU64"\n", target->obd_name,
 762               cluuid.uuid, ptlrpc_peernid2str(&req->rq_peer, peer_str), *cfp,
 763               target->obd_recovering ? "recovering/" : "", conn_data->transno);
 764
 765         if (target->obd_recovering) {
 766                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 767                 target_start_recovery_timer(target);
 768         }
 769
 770 #if 0
 771         /* Tell the client if we support replayable requests */
 772         if (target->obd_replayable)
 773                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 774 #endif
 775
 776         if (export == NULL) {
 777                 if (target->obd_recovering) {
 778                         CERROR("%s denying connection for new client %s@%s: "
 779                                "%d clients in recovery for %lds\n", target->obd_name,
 780                                cluuid.uuid,
 781                                ptlrpc_peernid2str(&req->rq_peer, peer_str),
 782                                target->obd_recoverable_clients,
 783                                (target->obd_recovery_timer.expires-jiffies)/HZ);
 784                         rc = -EBUSY;
 785                 } else {
 786  dont_check_exports:
 787                         rc = obd_connect(&conn, target, &cluuid, conn_data,
 788                                          connect_flags);
 789                 }
 790         }
 791
 792         /* Return only the parts of obd_connect_data that we understand, so the
 793          * client knows that we don't understand the rest. */
 794         conn_data->ocd_connect_flags &= OBD_CONNECT_SUPPORTED;
 795         memcpy(lustre_msg_buf(req->rq_repmsg, 0, sizeof(*conn_data)), conn_data,
 796                sizeof(*conn_data));
 797
 798         /* Tell the client if we support replayable requests */
 799         if (target->obd_replayable)
 800                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 801
 802         /* If all else goes well, this is our RPC return code. */
 803         req->rq_status = 0;
 804
 805         if (rc && rc != EALREADY)
 806                 GOTO(out, rc);
 807
 808         req->rq_repmsg->handle = conn;
 809
 810         /* If the client and the server are the same node, we will already
 811          * have an export that really points to the client's DLM export,
 812          * because we have a shared handles table.
 813          *
 814          * XXX this will go away when shaver stops sending the "connect" handle
 815          * in the real "remote handle" field of the request --phik 24 Apr 2003
 816          */
 817         if (req->rq_export != NULL)
 818                 class_export_put(req->rq_export);
 819
 820         /* ownership of this export ref transfers to the request */
 821         export = req->rq_export = class_conn2export(&conn);
 822         LASSERT(export != NULL);
 823
 824         spin_lock_irqsave(&export->exp_lock, flags);
 825         if (initial_conn) {
 826                 req->rq_repmsg->conn_cnt = export->exp_conn_cnt + 1;
 827         } else if (export->exp_conn_cnt >= req->rq_reqmsg->conn_cnt) {
 828                 CERROR("%s@%s: already connected at a higher conn_cnt: %d > %d\n",
 829                        cluuid.uuid, ptlrpc_peernid2str(&req->rq_peer, peer_str),
 830                        export->exp_conn_cnt,
 831                        req->rq_reqmsg->conn_cnt);
 832                 spin_unlock_irqrestore(&export->exp_lock, flags);
 833                 GOTO(out, rc = -EALREADY);
 834         }
 835         export->exp_conn_cnt = req->rq_reqmsg->conn_cnt;
 836         spin_unlock_irqrestore(&export->exp_lock, flags);
 837
 838         /* request from liblustre? */
 839         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT)
 840                 export->exp_libclient = 1;
 841
 842         if (!(lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_ASYNC) &&
 843             ptlrpc_peer_is_local(&req->rq_peer)) {
 844                 CWARN("%s: exp %p set sync\n", target->obd_name, export);
 845                 export->exp_sync = 1;
 846         } else {
 847                 CDEBUG(D_HA, "%s: exp %p set async\n",target->obd_name,export);
 848                 export->exp_sync = 0;
 849         }
 850
 851         if (export->exp_connection != NULL)
 852                 ptlrpc_put_connection(export->exp_connection);
 853         export->exp_connection = ptlrpc_get_connection(&req->rq_peer,
 854                                                        &remote_uuid);
 855
 856         if (rc == EALREADY) {
 857                 /* We indicate the reconnection in a flag, not an error code. */
 858                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 859                 GOTO(out, rc = 0);
 860         }
 861
 862         spin_lock_bh(&target->obd_processing_task_lock);
 863         if (target->obd_recovering && export->exp_connected == 0) {
 864                 __u64 t = conn_data->transno;
 865                 export->exp_connected = 1;
 866                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
 867                                 && t < target->obd_next_recovery_transno)
 868                         target->obd_next_recovery_transno = t;
 869                 target->obd_connected_clients++;
 870                 if (target->obd_connected_clients == target->obd_max_recoverable_clients)
 871                         wake_up(&target->obd_next_transno_waitq);
 872         }
 873         spin_unlock_bh(&target->obd_processing_task_lock);
 874
 875         memcpy(&conn, lustre_msg_buf(req->rq_reqmsg, offset + 2, sizeof(conn)),
 876                sizeof(conn));
 877
 878         if (export->exp_imp_reverse != NULL) {
 879                 /* same logic as client_obd_cleanup */
 880                 class_import_get(export->exp_imp_reverse);
 881                 class_destroy_import(export->exp_imp_reverse);
 882                 ptlrpcs_import_drop_sec(export->exp_imp_reverse);
 883                 class_import_put(export->exp_imp_reverse);
 884         }
 885
 886         /* for the rest part, we return -ENOTCONN in case of errors
 887          * in order to let client initialize connection again.
 888          */
 889         revimp = export->exp_imp_reverse = class_new_import();
 890         if (!revimp) {
 891                 CERROR("fail to alloc new reverse import.\n");
 892                 GOTO(out, rc = -ENOTCONN);
 893         }
 894
 895         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
 896         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
 897         revimp->imp_remote_handle = conn;
 898         revimp->imp_obd = target;
 899         revimp->imp_dlm_fake = 1;
 900         revimp->imp_state = LUSTRE_IMP_FULL;
 901
 902         rc = ptlrpcs_import_get_sec(revimp);
 903         if (rc) {
 904                 CERROR("reverse import can not get sec: %d\n", rc);
 905                 class_destroy_import(revimp);
 906                 export->exp_imp_reverse = NULL;
 907                 GOTO(out, rc = -ENOTCONN);
 908         }
 909
 910         class_import_put(revimp);
 911
 912         rc = obd_connect_post(export, initial_conn, connect_flags);
 913 out:
 914         if (rc)
 915                 req->rq_status = rc;
 916         RETURN(rc);
 917 }
 918
 919 int target_handle_disconnect(struct ptlrpc_request *req)
 920 {
 921         struct obd_export *exp;
 922         int rc;
 923         ENTRY;
 924
 925         rc = lustre_pack_reply(req, 0, NULL, NULL);
 926         if (rc)
 927                 RETURN(rc);
 928
 929         /* keep the rq_export around so we can send the reply */
 930         exp = class_export_get(req->rq_export);
 931         req->rq_status = obd_disconnect(exp, 0);
 932         RETURN(0);
 933 }
 934
 935 void target_destroy_export(struct obd_export *exp)
 936 {
 937         /* exports created from last_rcvd data, and "fake"
 938            exports created by lctl don't have an import */
 939         if (exp->exp_imp_reverse != NULL) {
 940                 ptlrpcs_import_drop_sec(exp->exp_imp_reverse);
 941                 class_destroy_import(exp->exp_imp_reverse);
 942         }
 943
 944         /* We cancel locks at disconnect time, but this will catch any locks
 945          * granted in a race with recovery-induced disconnect. */
 946         if (exp->exp_obd->obd_namespace != NULL)
 947                 ldlm_cancel_locks_for_export(exp);
 948 }
 949
 950 /*
 951  * Recovery functions
 952  */
 953
 954 struct ptlrpc_request *
 955 ptlrpc_clone_req( struct ptlrpc_request *orig_req)
 956 {
 957         struct ptlrpc_request *copy_req;
 958         struct lustre_msg *copy_reqmsg;
 959
 960         OBD_ALLOC(copy_req, sizeof *copy_req);
 961         if (!copy_req)
 962                 return NULL;
 963         OBD_ALLOC(copy_reqmsg, orig_req->rq_reqlen);
 964         if (!copy_reqmsg){
 965                 OBD_FREE(copy_req, sizeof *copy_req);
 966                 return NULL;
 967         }
 968
 969         memcpy(copy_req, orig_req, sizeof *copy_req);
 970         memcpy(copy_reqmsg, orig_req->rq_reqmsg, orig_req->rq_reqlen);
 971         /* the copied req takes over the reply state and security data */
 972         orig_req->rq_reply_state = NULL;
 973         orig_req->rq_svcsec_data = NULL;
 974
 975         copy_req->rq_reqmsg = copy_reqmsg;
 976         class_export_get(copy_req->rq_export);
 977         INIT_LIST_HEAD(&copy_req->rq_list);
 978
 979         return copy_req;
 980 }
 981
 982 void ptlrpc_free_clone( struct ptlrpc_request *req)
 983 {
 984         if (req->rq_svcsec)
 985                 svcsec_cleanup_req(req);
 986
 987         class_export_put(req->rq_export);
 988         list_del(&req->rq_list);
 989         OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 990         OBD_FREE(req, sizeof *req);
 991 }
 992
 993 static void target_release_saved_req(struct ptlrpc_request *req)
 994 {
 995         if (req->rq_svcsec)
 996                 svcsec_cleanup_req(req);
 997
 998         class_export_put(req->rq_export);
 999         OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
1000         OBD_FREE(req, sizeof *req);
1001 }
1002
1003 static void target_finish_recovery(struct obd_device *obd)
1004 {
1005         int rc;
1006
1007         ldlm_reprocess_all_ns(obd->obd_namespace);
1008
1009         /* when recovery finished, cleanup orphans on mds and ost */
1010         if (OBT(obd) && OBP(obd, postrecov)) {
1011                 rc = OBP(obd, postrecov)(obd);
1012                 if (rc >= 0)
1013                         CWARN("%s: all clients recovered, %d MDS "
1014                               "orphans deleted\n", obd->obd_name, rc);
1015                 else
1016                         CERROR("postrecov failed %d\n", rc);
1017         }
1018
1019         obd->obd_recovery_end = LTIME_S(CURRENT_TIME);
1020         return;
1021 }
1022
1023 static void abort_req_replay_queue(struct obd_device *obd)
1024 {
1025         struct ptlrpc_request *req;
1026         struct list_head *tmp, *n;
1027         int rc;
1028
1029         list_for_each_safe(tmp, n, &obd->obd_req_replay_queue) {
1030                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
1031                 list_del(&req->rq_list);
1032                 DEBUG_REQ(D_ERROR, req, "aborted:");
1033                 req->rq_status = -ENOTCONN;
1034                 req->rq_type = PTL_RPC_MSG_ERR;
1035                 rc = lustre_pack_reply(req, 0, NULL, NULL);
1036                 if (rc == 0) {
1037                         ptlrpc_reply(req);
1038                 } else {
1039                         DEBUG_REQ(D_ERROR, req,
1040                                   "packing failed for abort-reply; skipping");
1041                 }
1042                 target_release_saved_req(req);
1043         }
1044 }
1045
1046 static void abort_lock_replay_queue(struct obd_device *obd)
1047 {
1048         struct ptlrpc_request *req;
1049         struct list_head *tmp, *n;
1050         int rc;
1051
1052         list_for_each_safe(tmp, n, &obd->obd_lock_replay_queue) {
1053                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
1054                 list_del(&req->rq_list);
1055                 DEBUG_REQ(D_ERROR, req, "aborted:");
1056                 req->rq_status = -ENOTCONN;
1057                 req->rq_type = PTL_RPC_MSG_ERR;
1058                 rc = lustre_pack_reply(req, 0, NULL, NULL);
1059                 if (rc == 0) {
1060                         ptlrpc_reply(req);
1061                 } else {
1062                         DEBUG_REQ(D_ERROR, req,
1063                                   "packing failed for abort-reply; skipping");
1064                 }
1065                 target_release_saved_req(req);
1066         }
1067 }
1068
1069 /* Called from a cleanup function if the device is being cleaned up
1070    forcefully.  The exports should all have been disconnected already,
1071    the only thing left to do is
1072      - clear the recovery flags
1073      - cancel the timer
1074      - free queued requests and replies, but don't send replies
1075    Because the obd_stopping flag is set, no new requests should be received.
1076
1077 */
1078 void target_cleanup_recovery(struct obd_device *obd)
1079 {
1080         struct list_head *tmp, *n;
1081         struct ptlrpc_request *req;
1082
1083         spin_lock_bh(&obd->obd_processing_task_lock);
1084         if (!obd->obd_recovering) {
1085                 spin_unlock_bh(&obd->obd_processing_task_lock);
1086                 EXIT;
1087                 return;
1088         }
1089         obd->obd_recovering = obd->obd_abort_recovery = 0;
1090         target_cancel_recovery_timer(obd);
1091         spin_unlock_bh(&obd->obd_processing_task_lock);
1092
1093         list_for_each_safe(tmp, n, &obd->obd_req_replay_queue) {
1094                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
1095                 list_del(&req->rq_list);
1096                 LASSERT (req->rq_reply_state == 0);
1097                 target_release_saved_req(req);
1098         }
1099         list_for_each_safe(tmp, n, &obd->obd_lock_replay_queue) {
1100                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
1101                 list_del(&req->rq_list);
1102                 LASSERT (req->rq_reply_state == 0);
1103                 target_release_saved_req(req);
1104         }
1105         list_for_each_safe(tmp, n, &obd->obd_final_req_queue) {
1106                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
1107                 list_del(&req->rq_list);
1108                 LASSERT (req->rq_reply_state == 0);
1109                 target_release_saved_req(req);
1110         }
1111 }
1112
1113 #if 0
1114 static void target_abort_recovery(void *data)
1115 {
1116         struct obd_device *obd = data;
1117
1118         LASSERT(!obd->obd_recovering);
1119
1120         class_disconnect_stale_exports(obd, 0);
1121
1122         CERROR("%s: recovery period over; disconnecting unfinished clients.\n",
1123                obd->obd_name);
1124
1125         abort_recovery_queue(obd);
1126         target_finish_recovery(obd);
1127         ptlrpc_run_recovery_over_upcall(obd);
1128 }
1129 #endif
1130
1131 static void target_recovery_expired(unsigned long castmeharder)
1132 {
1133         struct obd_device *obd = (struct obd_device *)castmeharder;
1134         spin_lock_bh(&obd->obd_processing_task_lock);
1135         if (obd->obd_recovering)
1136                 obd->obd_abort_recovery = 1;
1137
1138         wake_up(&obd->obd_next_transno_waitq);
1139         spin_unlock_bh(&obd->obd_processing_task_lock);
1140 }
1141
1142
1143 /* obd_processing_task_lock should be held */
1144 void target_cancel_recovery_timer(struct obd_device *obd)
1145 {
1146         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1147         del_timer(&obd->obd_recovery_timer);
1148 }
1149
1150 #ifdef __KERNEL__
1151 static void reset_recovery_timer(struct obd_device *obd)
1152 {
1153         spin_lock_bh(&obd->obd_processing_task_lock);
1154         if (!obd->obd_recovering) {
1155                 spin_unlock_bh(&obd->obd_processing_task_lock);
1156                 return;
1157         }
1158         CDEBUG(D_HA, "timer will expire in %u seconds\n",
1159                OBD_RECOVERY_TIMEOUT / HZ);
1160         mod_timer(&obd->obd_recovery_timer, jiffies + OBD_RECOVERY_TIMEOUT);
1161         spin_unlock_bh(&obd->obd_processing_task_lock);
1162 }
1163 #endif
1164
1165 /* Only start it the first time called */
1166 void target_start_recovery_timer(struct obd_device *obd)
1167 {
1168         spin_lock_bh(&obd->obd_processing_task_lock);
1169         if (!obd->obd_recovering || timer_pending(&obd->obd_recovery_timer)) {
1170                 spin_unlock_bh(&obd->obd_processing_task_lock);
1171                 return;
1172         }
1173         CWARN("%s: starting recovery timer (%us)\n", obd->obd_name,
1174                OBD_RECOVERY_TIMEOUT / HZ);
1175         obd->obd_recovery_timer.function = target_recovery_expired;
1176         obd->obd_recovery_timer.data = (unsigned long)obd;
1177         mod_timer(&obd->obd_recovery_timer, jiffies + OBD_RECOVERY_TIMEOUT);
1178         spin_unlock_bh(&obd->obd_processing_task_lock);
1179 }
1180
1181 #ifdef __KERNEL__
1182 static int check_for_next_transno(struct obd_device *obd)
1183 {
1184         struct ptlrpc_request *req = NULL;
1185         int wake_up = 0, connected, completed, queue_len, max;
1186         __u64 next_transno, req_transno;
1187
1188         spin_lock_bh(&obd->obd_processing_task_lock);
1189         if (!list_empty(&obd->obd_req_replay_queue)) {
1190                 req = list_entry(obd->obd_req_replay_queue.next,
1191                                  struct ptlrpc_request, rq_list);
1192                 req_transno = req->rq_reqmsg->transno;
1193         } else {
1194                 req_transno = 0;
1195         }
1196
1197         max = obd->obd_max_recoverable_clients;
1198         connected = obd->obd_connected_clients;
1199         completed = max - obd->obd_recoverable_clients;
1200         queue_len = obd->obd_requests_queued_for_recovery;
1201         next_transno = obd->obd_next_recovery_transno;
1202
1203         CDEBUG(D_HA,"max: %d, connected: %d, completed: %d, queue_len: %d, "
1204                "req_transno: "LPU64", next_transno: "LPU64"\n",
1205                max, connected, completed, queue_len, req_transno, next_transno);
1206         if (obd->obd_abort_recovery) {
1207                 CDEBUG(D_HA, "waking for aborted recovery\n");
1208                 wake_up = 1;
1209         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1210                 CDEBUG(D_HA, "waking for completed recovery\n");
1211                 wake_up = 1;
1212         } else if (req_transno == next_transno) {
1213                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1214                 wake_up = 1;
1215         } else if (queue_len + completed == max) {
1216                 LASSERT(req->rq_reqmsg->transno >= next_transno);
1217                 CDEBUG(req_transno > obd->obd_last_committed ? D_ERROR : D_HA,
1218                        "waking for skipped transno (skip: "LPD64
1219                        ", ql: %d, comp: %d, conn: %d, next: "LPD64")\n",
1220                        next_transno, queue_len, completed, max, req_transno);
1221                 obd->obd_next_recovery_transno = req_transno;
1222                 wake_up = 1;
1223         } else if (queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1224                 /* some clients haven't connected in time, but we can try
1225                  * to replay requests that demand on already committed ones
1226                  * also, we can replay first non-committed transation */
1227                 LASSERT(req_transno != 0);
1228                 if (req_transno == obd->obd_last_committed + 1) {
1229                         obd->obd_next_recovery_transno = req_transno;
1230                 } else if (req_transno > obd->obd_last_committed) {
1231                         /* can't continue recovery: have no needed transno */
1232                         obd->obd_abort_recovery = 1;
1233                         CDEBUG(D_ERROR, "abort due to missed clients. max: %d, "
1234                                "connected: %d, completed: %d, queue_len: %d, "
1235                                "req_transno: "LPU64", next_transno: "LPU64"\n",
1236                                max, connected, completed, queue_len,
1237                                req_transno, next_transno);
1238                 }
1239                 wake_up = 1;
1240         }
1241         spin_unlock_bh(&obd->obd_processing_task_lock);
1242
1243         return wake_up;
1244 }
1245
1246 static struct ptlrpc_request *
1247 target_next_replay_req(struct obd_device *obd)
1248 {
1249         struct l_wait_info lwi = { 0 };
1250         struct ptlrpc_request *req;
1251
1252         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1253                obd->obd_next_recovery_transno);
1254         l_wait_event(obd->obd_next_transno_waitq,
1255                      check_for_next_transno(obd), &lwi);
1256
1257         spin_lock_bh(&obd->obd_processing_task_lock);
1258         if (obd->obd_abort_recovery) {
1259                 req = NULL;
1260         } else if (!list_empty(&obd->obd_req_replay_queue)) {
1261                 req = list_entry(obd->obd_req_replay_queue.next,
1262                                  struct ptlrpc_request, rq_list);
1263                 list_del_init(&req->rq_list);
1264                 obd->obd_requests_queued_for_recovery--;
1265         } else {
1266                 req = NULL;
1267         }
1268         spin_unlock_bh(&obd->obd_processing_task_lock);
1269         return req;
1270 }
1271
1272 static int check_for_next_lock(struct obd_device *obd)
1273 {
1274         struct ptlrpc_request *req = NULL;
1275         int wake_up = 0;
1276
1277         spin_lock_bh(&obd->obd_processing_task_lock);
1278         if (!list_empty(&obd->obd_lock_replay_queue)) {
1279                 req = list_entry(obd->obd_lock_replay_queue.next,
1280                                  struct ptlrpc_request, rq_list);
1281                 CDEBUG(D_HA, "waking for next lock\n");
1282                 wake_up = 1;
1283         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1284                 CDEBUG(D_HA, "waking for completed lock replay\n");
1285                 wake_up = 1;
1286         } else if (obd->obd_abort_recovery) {
1287                 CDEBUG(D_HA, "waking for aborted recovery\n");
1288                 wake_up = 1;
1289         }
1290         spin_unlock_bh(&obd->obd_processing_task_lock);
1291
1292         return wake_up;
1293 }
1294
1295 static struct ptlrpc_request *
1296 target_next_replay_lock(struct obd_device *obd)
1297 {
1298         struct l_wait_info lwi = { 0 };
1299         struct ptlrpc_request *req;
1300
1301         CDEBUG(D_HA, "Waiting for lock\n");
1302         l_wait_event(obd->obd_next_transno_waitq,
1303                      check_for_next_lock(obd), &lwi);
1304
1305         spin_lock_bh(&obd->obd_processing_task_lock);
1306         if (obd->obd_abort_recovery) {
1307                 req = NULL;
1308         } else if (!list_empty(&obd->obd_lock_replay_queue)) {
1309                 req = list_entry(obd->obd_lock_replay_queue.next,
1310                                  struct ptlrpc_request, rq_list);
1311                 list_del_init(&req->rq_list);
1312         } else {
1313                 req = NULL;
1314         }
1315         spin_unlock_bh(&obd->obd_processing_task_lock);
1316         return req;
1317 }
1318
1319 static struct ptlrpc_request *
1320 target_next_final_ping(struct obd_device *obd)
1321 {
1322         struct ptlrpc_request *req;
1323
1324         spin_lock_bh(&obd->obd_processing_task_lock);
1325         if (!list_empty(&obd->obd_final_req_queue)) {
1326                 req = list_entry(obd->obd_final_req_queue.next,
1327                                  struct ptlrpc_request, rq_list);
1328                 list_del_init(&req->rq_list);
1329         } else {
1330                 req = NULL;
1331         }
1332         spin_unlock_bh(&obd->obd_processing_task_lock);
1333         return req;
1334 }
1335
1336 static int req_replay_done(struct obd_export *exp)
1337 {
1338         if (exp->exp_req_replay_needed)
1339                 return 0;
1340         return 1;
1341 }
1342
1343 static int lock_replay_done(struct obd_export *exp)
1344 {
1345         if (exp->exp_lock_replay_needed)
1346                 return 0;
1347         return 1;
1348 }
1349
1350 static int connect_done(struct obd_export *exp)
1351 {
1352         if (exp->exp_connected)
1353                 return 1;
1354         return 0;
1355 }
1356
1357 static int check_for_clients(struct obd_device *obd)
1358 {
1359         if (obd->obd_abort_recovery)
1360                 return 1;
1361         LASSERT(obd->obd_connected_clients <= obd->obd_max_recoverable_clients);
1362         if (obd->obd_connected_clients == obd->obd_max_recoverable_clients)
1363                 return 1;
1364         return 0;
1365 }
1366
1367 static int target_recovery_thread(void *arg)
1368 {
1369         struct obd_device *obd = arg;
1370         struct ptlrpc_request *req;
1371         struct target_recovery_data *trd = &obd->obd_recovery_data;
1372         char peer_str[PTL_NALFMT_SIZE];
1373         struct l_wait_info lwi = { 0 };
1374         unsigned long delta;
1375         unsigned long flags;
1376         ENTRY;
1377
1378         kportal_daemonize("tgt-recov");
1379
1380         SIGNAL_MASK_LOCK(current, flags);
1381         sigfillset(&current->blocked);
1382         RECALC_SIGPENDING;
1383         SIGNAL_MASK_UNLOCK(current, flags);
1384
1385         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
1386                current->pid);
1387         trd->trd_processing_task = current->pid;
1388
1389         obd->obd_recovering = 1;
1390         complete(&trd->trd_starting);
1391
1392         /* first of all, we have to know the first transno to replay */
1393         obd->obd_abort_recovery = 0;
1394         l_wait_event(obd->obd_next_transno_waitq,
1395                      check_for_clients(obd), &lwi);
1396
1397         spin_lock_bh(&obd->obd_processing_task_lock);
1398         target_cancel_recovery_timer(obd);
1399         spin_unlock_bh(&obd->obd_processing_task_lock);
1400
1401         /* If some clients haven't connected in time, evict them */
1402         if (obd->obd_abort_recovery) {
1403                 int stale;
1404                 CDEBUG(D_ERROR, "few clients haven't connect in time (%d/%d),"
1405                        "evict them ...\n", obd->obd_connected_clients,
1406                        obd->obd_max_recoverable_clients);
1407                 obd->obd_abort_recovery = 0;
1408                 stale = class_disconnect_stale_exports(obd, connect_done, 0);
1409                 atomic_sub(stale, &obd->obd_req_replay_clients);
1410                 atomic_sub(stale, &obd->obd_lock_replay_clients);
1411         }
1412
1413         /* next stage: replay requests */
1414         delta = jiffies;
1415         obd->obd_req_replaying = 1;
1416         CDEBUG(D_ERROR, "1: request replay stage - %d clients from t"LPU64"\n",
1417               atomic_read(&obd->obd_req_replay_clients),
1418               obd->obd_next_recovery_transno);
1419         while ((req = target_next_replay_req(obd))) {
1420                 LASSERT(trd->trd_processing_task == current->pid);
1421                 DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s",
1422                           req->rq_reqmsg->transno,
1423                           ptlrpc_peernid2str(&req->rq_peer, peer_str));
1424                 (void)trd->trd_recovery_handler(req);
1425                 obd->obd_replayed_requests++;
1426                 reset_recovery_timer(obd);
1427                 /* bug 1580: decide how to properly sync() in recovery*/
1428                 //mds_fsync_super(mds->mds_sb);
1429                 ptlrpc_free_clone(req);
1430                 spin_lock_bh(&obd->obd_processing_task_lock);
1431                 obd->obd_next_recovery_transno++;
1432                 spin_unlock_bh(&obd->obd_processing_task_lock);
1433         }
1434
1435         spin_lock_bh(&obd->obd_processing_task_lock);
1436         target_cancel_recovery_timer(obd);
1437         spin_unlock_bh(&obd->obd_processing_task_lock);
1438
1439         /* If some clients haven't replayed requests in time, evict them */
1440         if (obd->obd_abort_recovery) {
1441                 int stale;
1442                 CDEBUG(D_ERROR, "req replay timed out, aborting ...\n");
1443                 obd->obd_abort_recovery = 0;
1444                 stale = class_disconnect_stale_exports(obd, req_replay_done, 0);
1445                 atomic_sub(stale, &obd->obd_lock_replay_clients);
1446                 abort_req_replay_queue(obd);
1447                 /* XXX for debuggin tests 11 and 17 */
1448                 LBUG();
1449         }
1450
1451         /* The second stage: replay locks */
1452         CDEBUG(D_ERROR, "2: lock replay stage - %d clients\n",
1453               atomic_read(&obd->obd_lock_replay_clients));
1454         while ((req = target_next_replay_lock(obd))) {
1455                 LASSERT(trd->trd_processing_task == current->pid);
1456                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
1457                           ptlrpc_peernid2str(&req->rq_peer, peer_str));
1458                 (void)trd->trd_recovery_handler(req);
1459                 reset_recovery_timer(obd);
1460                 ptlrpc_free_clone(req);
1461                 obd->obd_replayed_locks++;
1462         }
1463
1464         spin_lock_bh(&obd->obd_processing_task_lock);
1465         target_cancel_recovery_timer(obd);
1466         spin_unlock_bh(&obd->obd_processing_task_lock);
1467
1468         /* If some clients haven't replayed requests in time, evict them */
1469         if (obd->obd_abort_recovery) {
1470                 int stale;
1471                 CERROR("lock replay timed out, aborting ...\n");
1472                 obd->obd_abort_recovery = 0;
1473                 stale = class_disconnect_stale_exports(obd, lock_replay_done, 0);
1474                 abort_lock_replay_queue(obd);
1475         }
1476
1477         /* We drop recoverying flag to forward all new requests
1478          * to regular mds_handle() since now */
1479         spin_lock_bh(&obd->obd_processing_task_lock);
1480         obd->obd_recovering = 0;
1481         spin_unlock_bh(&obd->obd_processing_task_lock);
1482
1483         /* The third stage: reply on final pings */
1484         CDEBUG(D_ERROR, "3: final stage - process recovery completion pings\n");
1485         while ((req = target_next_final_ping(obd))) {
1486                 LASSERT(trd->trd_processing_task == current->pid);
1487                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
1488                           ptlrpc_peernid2str(&req->rq_peer, peer_str));
1489                 (void)trd->trd_recovery_handler(req);
1490                 ptlrpc_free_clone(req);
1491         }
1492
1493         delta = (jiffies - delta) / HZ;
1494         CDEBUG(D_ERROR,"4: recovery completed in %lus - %d/%d reqs/locks\n",
1495               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
1496         if (delta > obd_timeout * 2) {
1497                 CWARN("too long recovery - read logs\n");
1498                 portals_debug_dumplog();
1499         }
1500         target_finish_recovery(obd);
1501
1502         trd->trd_processing_task = 0;
1503         complete(&trd->trd_finishing);
1504         return 0;
1505 }
1506
1507 int target_start_recovery_thread(struct obd_device *obd, svc_handler_t handler)
1508 {
1509         int rc = 0;
1510         struct target_recovery_data *trd = &obd->obd_recovery_data;
1511
1512         memset(trd, 0, sizeof(*trd));
1513         init_completion(&trd->trd_starting);
1514         init_completion(&trd->trd_finishing);
1515         trd->trd_recovery_handler = handler;
1516
1517         if (kernel_thread(target_recovery_thread, obd, 0) > 0) {
1518                 wait_for_completion(&trd->trd_starting);
1519                 LASSERT(obd->obd_recovering != 0);
1520         } else
1521                 rc = -ECHILD;
1522
1523         return rc;
1524 }
1525
1526 void target_stop_recovery_thread(struct obd_device *obd)
1527 {
1528         spin_lock_bh(&obd->obd_processing_task_lock);
1529         if (obd->obd_recovery_data.trd_processing_task > 0) {
1530                 struct target_recovery_data *trd = &obd->obd_recovery_data;
1531                 CERROR("%s: aborting recovery\n", obd->obd_name);
1532                 obd->obd_abort_recovery = 1;
1533                 wake_up(&obd->obd_next_transno_waitq);
1534                 spin_unlock_bh(&obd->obd_processing_task_lock);
1535                 wait_for_completion(&trd->trd_finishing);
1536         } else {
1537                 spin_unlock_bh(&obd->obd_processing_task_lock);
1538         }
1539 }
1540 #endif
1541
1542 int target_process_req_flags(struct obd_device *obd, struct ptlrpc_request *req)
1543 {
1544         struct obd_export *exp = req->rq_export;
1545         LASSERT(exp != NULL);
1546         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1547                 /* client declares he's ready to replay locks */
1548                 spin_lock_bh(&obd->obd_processing_task_lock);
1549                 if (exp->exp_req_replay_needed) {
1550                         LASSERT(atomic_read(&obd->obd_req_replay_clients) > 0);
1551                         exp->exp_req_replay_needed = 0;
1552                         atomic_dec(&obd->obd_req_replay_clients);
1553                         obd->obd_recoverable_clients--;
1554                         if (atomic_read(&obd->obd_req_replay_clients) == 0)
1555                                 CDEBUG(D_HA, "all clients have replayed reqs\n");
1556                         wake_up(&obd->obd_next_transno_waitq);
1557                 }
1558                 spin_unlock_bh(&obd->obd_processing_task_lock);
1559         }
1560         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1561                 /* client declares he's ready to complete recovery
1562                  * so, we put the request on th final queue */
1563                 spin_lock_bh(&obd->obd_processing_task_lock);
1564                 if (exp->exp_lock_replay_needed) {
1565                         LASSERT(atomic_read(&obd->obd_lock_replay_clients) > 0);
1566                         exp->exp_lock_replay_needed = 0;
1567                         atomic_dec(&obd->obd_lock_replay_clients);
1568                         if (atomic_read(&obd->obd_lock_replay_clients) == 0)
1569                                 CDEBUG(D_HA, "all clients have replayed locks\n");
1570                         wake_up(&obd->obd_next_transno_waitq);
1571                 }
1572                 spin_unlock_bh(&obd->obd_processing_task_lock);
1573         }
1574
1575         return 0;
1576 }
1577
1578 int target_queue_recovery_request(struct ptlrpc_request *req,
1579                                   struct obd_device *obd)
1580 {
1581         struct list_head *tmp;
1582         int inserted = 0;
1583         __u64 transno = req->rq_reqmsg->transno;
1584
1585         if (obd->obd_recovery_data.trd_processing_task == current->pid) {
1586                 /* Processing the queue right now, don't re-add. */
1587                 return 1;
1588         }
1589
1590         target_process_req_flags(obd, req);
1591
1592         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1593                 /* client declares he's ready to complete recovery
1594                  * so, we put the request on th final queue */
1595                 req = ptlrpc_clone_req(req);
1596                 if (req == NULL)
1597                         return -ENOMEM;
1598                 DEBUG_REQ(D_HA, req, "queue final req");
1599                 spin_lock_bh(&obd->obd_processing_task_lock);
1600                 list_add_tail(&req->rq_list, &obd->obd_final_req_queue);
1601                 spin_unlock_bh(&obd->obd_processing_task_lock);
1602                 return 0;
1603         }
1604         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1605                 /* client declares he's ready to replay locks */
1606                 req = ptlrpc_clone_req(req);
1607                 if (req == NULL)
1608                         return -ENOMEM;
1609                 DEBUG_REQ(D_HA, req, "queue lock replay req");
1610                 spin_lock_bh(&obd->obd_processing_task_lock);
1611                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
1612                 spin_unlock_bh(&obd->obd_processing_task_lock);
1613                 wake_up(&obd->obd_next_transno_waitq);
1614                 return 0;
1615         }
1616
1617
1618         /* CAVEAT EMPTOR: The incoming request message has been swabbed
1619          * (i.e. buflens etc are in my own byte order), but type-dependent
1620          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
1621
1622         if (!transno) {
1623                 INIT_LIST_HEAD(&req->rq_list);
1624                 DEBUG_REQ(D_HA, req, "not queueing");
1625                 return 1;
1626         }
1627
1628
1629         /* If we're processing the queue, we want don't want to queue this
1630          * message.
1631          *
1632          * Also, if this request has a transno less than the one we're waiting
1633          * for, we should process it now.  It could (and currently always will)
1634          * be an open request for a descriptor that was opened some time ago.
1635          *
1636          * Also, a resent, replayed request that has already been
1637          * handled will pass through here and be processed immediately.
1638          */
1639         spin_lock_bh(&obd->obd_processing_task_lock);
1640         if (transno < obd->obd_next_recovery_transno && obd->obd_req_replaying) {
1641                 /* Processing the queue right now, don't re-add. */
1642                 LASSERT(list_empty(&req->rq_list));
1643                 spin_unlock_bh(&obd->obd_processing_task_lock);
1644                 return 1;
1645         }
1646         spin_unlock_bh(&obd->obd_processing_task_lock);
1647
1648         /* A resent, replayed request that is still on the queue; just drop it.
1649            The queued request will handle this. */
1650         if ((lustre_msg_get_flags(req->rq_reqmsg) & (MSG_RESENT | MSG_REPLAY))
1651             == (MSG_RESENT | MSG_REPLAY)) {
1652                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
1653                 return 0;
1654         }
1655
1656         req = ptlrpc_clone_req(req);
1657         if (req == NULL)
1658                 return -ENOMEM;
1659
1660         spin_lock_bh(&obd->obd_processing_task_lock);
1661
1662         /* XXX O(n^2) */
1663         list_for_each(tmp, &obd->obd_req_replay_queue) {
1664                 struct ptlrpc_request *reqiter =
1665                         list_entry(tmp, struct ptlrpc_request, rq_list);
1666
1667                 if (reqiter->rq_reqmsg->transno > transno) {
1668                         list_add_tail(&req->rq_list, &reqiter->rq_list);
1669                         inserted = 1;
1670                         break;
1671                 }
1672         }
1673
1674         if (!inserted)
1675                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
1676
1677         obd->obd_requests_queued_for_recovery++;
1678         wake_up(&obd->obd_next_transno_waitq);
1679         spin_unlock_bh(&obd->obd_processing_task_lock);
1680         return 0;
1681 }
1682
1683 struct obd_device * target_req2obd(struct ptlrpc_request *req)
1684 {
1685         return req->rq_export->exp_obd;
1686 }
1687
1688 int
1689 target_send_reply_msg (struct ptlrpc_request *req, int rc, int fail_id)
1690 {
1691         if (OBD_FAIL_CHECK(fail_id | OBD_FAIL_ONCE)) {
1692                 obd_fail_loc |= OBD_FAIL_ONCE | OBD_FAILED;
1693                 DEBUG_REQ(D_ERROR, req, "dropping reply");
1694                 /* NB this does _not_ send with ACK disabled, to simulate
1695                  * sending OK, but timing out for the ACK */
1696                 if (req->rq_reply_state != NULL) {
1697                         if (!req->rq_reply_state->rs_difficult) {
1698                                 lustre_free_reply_state (req->rq_reply_state);
1699                                 req->rq_reply_state = NULL;
1700                         } else {
1701                                 struct ptlrpc_service *svc =
1702                                         req->rq_rqbd->rqbd_srv_ni->sni_service;
1703                                 atomic_inc(&svc->srv_outstanding_replies);
1704                         }
1705                 }
1706                 return (-ECOMM);
1707         }
1708
1709         if (rc) {
1710                 req->rq_status = rc;
1711                 return (ptlrpc_error(req));
1712         } else {
1713                 DEBUG_REQ(D_NET, req, "sending reply");
1714         }
1715
1716         return (ptlrpc_send_reply(req, 1));
1717 }
1718
1719 void
1720 target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
1721 {
1722         int                        netrc;
1723         unsigned long              flags;
1724         struct ptlrpc_reply_state *rs;
1725         struct obd_device         *obd;
1726         struct obd_export         *exp;
1727         struct ptlrpc_srv_ni      *sni;
1728         struct ptlrpc_service     *svc;
1729
1730         sni = req->rq_rqbd->rqbd_srv_ni;
1731         svc = sni->sni_service;
1732
1733         rs = req->rq_reply_state;
1734         if (rs == NULL || !rs->rs_difficult) {
1735                 /* The easy case; no notifiers and reply_out_callback()
1736                  * cleans up (i.e. we can't look inside rs after a
1737                  * successful send) */
1738                 netrc = target_send_reply_msg (req, rc, fail_id);
1739
1740                 LASSERT (netrc == 0 || req->rq_reply_state == NULL);
1741                 return;
1742         }
1743
1744         /* must be an export if locks saved */
1745         LASSERT (req->rq_export != NULL);
1746         /* req/reply consistent */
1747         LASSERT (rs->rs_srv_ni == sni);
1748
1749         /* "fresh" reply */
1750         LASSERT (!rs->rs_scheduled);
1751         LASSERT (!rs->rs_scheduled_ever);
1752         LASSERT (!rs->rs_handled);
1753         LASSERT (!rs->rs_on_net);
1754         LASSERT (rs->rs_export == NULL);
1755         LASSERT (list_empty(&rs->rs_obd_list));
1756         LASSERT (list_empty(&rs->rs_exp_list));
1757
1758         exp = class_export_get (req->rq_export);
1759         obd = exp->exp_obd;
1760
1761         /* disable reply scheduling onto srv_reply_queue while I'm setting up */
1762         rs->rs_scheduled = 1;
1763         rs->rs_on_net    = 1;
1764         rs->rs_xid       = req->rq_xid;
1765         rs->rs_transno   = req->rq_transno;
1766         rs->rs_export    = exp;
1767
1768         spin_lock_irqsave (&obd->obd_uncommitted_replies_lock, flags);
1769
1770         if (rs->rs_transno > obd->obd_last_committed) {
1771                 /* not committed already */
1772                 list_add_tail (&rs->rs_obd_list,
1773                                &obd->obd_uncommitted_replies);
1774         }
1775
1776         spin_unlock (&obd->obd_uncommitted_replies_lock);
1777         spin_lock (&exp->exp_lock);
1778
1779         list_add_tail (&rs->rs_exp_list, &exp->exp_outstanding_replies);
1780
1781         spin_unlock_irqrestore (&exp->exp_lock, flags);
1782
1783         netrc = target_send_reply_msg (req, rc, fail_id);
1784
1785         spin_lock_irqsave (&svc->srv_lock, flags);
1786
1787         svc->srv_n_difficult_replies++;
1788
1789         if (netrc != 0) /* error sending: reply is off the net */
1790                 rs->rs_on_net = 0;
1791
1792         if (!rs->rs_on_net ||                   /* some notifier */
1793             list_empty(&rs->rs_exp_list) ||     /* completed already */
1794             list_empty(&rs->rs_obd_list)) {
1795                 list_add_tail (&rs->rs_list, &svc->srv_reply_queue);
1796                 wake_up (&svc->srv_waitq);
1797         } else {
1798                 list_add (&rs->rs_list, &sni->sni_active_replies);
1799                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
1800         }
1801
1802         spin_unlock_irqrestore (&svc->srv_lock, flags);
1803 }
1804
1805 int target_handle_ping(struct ptlrpc_request *req)
1806 {
1807         return lustre_pack_reply(req, 0, NULL, NULL);
1808 }