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