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