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  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #ifndef EXPORT_SYMTAB
  38 # define EXPORT_SYMTAB
  39 #endif
  40 #define DEBUG_SUBSYSTEM S_LDLM
  41
  42 #ifdef __KERNEL__
  43 # include <libcfs/libcfs.h>
  44 #else
  45 # include <liblustre.h>
  46 #endif
  47 #include <obd.h>
  48 #include <lustre_mds.h>
  49 #include <lustre_dlm.h>
  50 #include <lustre_net.h>
  51 #include <lustre_sec.h>
  52 #include "ldlm_internal.h"
  53
  54 /* @priority: if non-zero, move the selected to the list head
  55  * @create: if zero, only search in existed connections
  56  */
  57 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  58                            int priority, int create)
  59 {
  60         struct ptlrpc_connection *ptlrpc_conn;
  61         struct obd_import_conn *imp_conn = NULL, *item;
  62         int rc = 0;
  63         ENTRY;
  64
  65         if (!create && !priority) {
  66                 CDEBUG(D_HA, "Nothing to do\n");
  67                 RETURN(-EINVAL);
  68         }
  69
  70         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
  71         if (!ptlrpc_conn) {
  72                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  73                 RETURN (-ENOENT);
  74         }
  75
  76         if (create) {
  77                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  78                 if (!imp_conn) {
  79                         GOTO(out_put, rc = -ENOMEM);
  80                 }
  81         }
  82
  83         cfs_spin_lock(&imp->imp_lock);
  84         cfs_list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  85                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  86                         if (priority) {
  87                                 cfs_list_del(&item->oic_item);
  88                                 cfs_list_add(&item->oic_item,
  89                                              &imp->imp_conn_list);
  90                                 item->oic_last_attempt = 0;
  91                         }
  92                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  93                                imp, imp->imp_obd->obd_name, uuid->uuid,
  94                                (priority ? ", moved to head" : ""));
  95                         cfs_spin_unlock(&imp->imp_lock);
  96                         GOTO(out_free, rc = 0);
  97                 }
  98         }
  99         /* not found */
 100         if (create) {
 101                 imp_conn->oic_conn = ptlrpc_conn;
 102                 imp_conn->oic_uuid = *uuid;
 103                 imp_conn->oic_last_attempt = 0;
 104                 if (priority)
 105                         cfs_list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 106                 else
 107                         cfs_list_add_tail(&imp_conn->oic_item,
 108                                           &imp->imp_conn_list);
 109                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 110                        imp, imp->imp_obd->obd_name, uuid->uuid,
 111                        (priority ? "head" : "tail"));
 112         } else {
 113                 cfs_spin_unlock(&imp->imp_lock);
 114                 GOTO(out_free, rc = -ENOENT);
 115         }
 116
 117         cfs_spin_unlock(&imp->imp_lock);
 118         RETURN(0);
 119 out_free:
 120         if (imp_conn)
 121                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 122 out_put:
 123         ptlrpc_connection_put(ptlrpc_conn);
 124         RETURN(rc);
 125 }
 126
 127 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 128 {
 129         return import_set_conn(imp, uuid, 1, 0);
 130 }
 131
 132 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 133                            int priority)
 134 {
 135         return import_set_conn(imp, uuid, priority, 1);
 136 }
 137
 138 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 139 {
 140         struct obd_import_conn *imp_conn;
 141         struct obd_export *dlmexp;
 142         int rc = -ENOENT;
 143         ENTRY;
 144
 145         cfs_spin_lock(&imp->imp_lock);
 146         if (cfs_list_empty(&imp->imp_conn_list)) {
 147                 LASSERT(!imp->imp_connection);
 148                 GOTO(out, rc);
 149         }
 150
 151         cfs_list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 152                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 153                         continue;
 154                 LASSERT(imp_conn->oic_conn);
 155
 156                 /* is current conn? */
 157                 if (imp_conn == imp->imp_conn_current) {
 158                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 159
 160                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 161                             imp->imp_state != LUSTRE_IMP_DISCON) {
 162                                 CERROR("can't remove current connection\n");
 163                                 GOTO(out, rc = -EBUSY);
 164                         }
 165
 166                         ptlrpc_connection_put(imp->imp_connection);
 167                         imp->imp_connection = NULL;
 168
 169                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 170                         if (dlmexp && dlmexp->exp_connection) {
 171                                 LASSERT(dlmexp->exp_connection ==
 172                                         imp_conn->oic_conn);
 173                                 ptlrpc_connection_put(dlmexp->exp_connection);
 174                                 dlmexp->exp_connection = NULL;
 175                         }
 176                 }
 177
 178                 cfs_list_del(&imp_conn->oic_item);
 179                 ptlrpc_connection_put(imp_conn->oic_conn);
 180                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 181                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 182                        imp, imp->imp_obd->obd_name, uuid->uuid);
 183                 rc = 0;
 184                 break;
 185         }
 186 out:
 187         cfs_spin_unlock(&imp->imp_lock);
 188         if (rc == -ENOENT)
 189                 CERROR("connection %s not found\n", uuid->uuid);
 190         RETURN(rc);
 191 }
 192
 193 void client_destroy_import(struct obd_import *imp)
 194 {
 195         /* drop security policy instance after all rpc finished/aborted
 196          * to let all busy contexts be released. */
 197         class_import_get(imp);
 198         class_destroy_import(imp);
 199         sptlrpc_import_sec_put(imp);
 200         class_import_put(imp);
 201 }
 202
 203 /* configure an RPC client OBD device
 204  *
 205  * lcfg parameters:
 206  * 1 - client UUID
 207  * 2 - server UUID
 208  * 3 - inactive-on-startup
 209  */
 210 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 211 {
 212         struct client_obd *cli = &obddev->u.cli;
 213         struct obd_import *imp;
 214         struct obd_uuid server_uuid;
 215         int rq_portal, rp_portal, connect_op;
 216         char *name = obddev->obd_type->typ_name;
 217         ldlm_ns_type_t ns_type = LDLM_NS_TYPE_UNKNOWN;
 218         int rc;
 219         ENTRY;
 220
 221         /* In a more perfect world, we would hang a ptlrpc_client off of
 222          * obd_type and just use the values from there. */
 223         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 224                 rq_portal = OST_REQUEST_PORTAL;
 225                 rp_portal = OSC_REPLY_PORTAL;
 226                 connect_op = OST_CONNECT;
 227                 cli->cl_sp_me = LUSTRE_SP_CLI;
 228                 cli->cl_sp_to = LUSTRE_SP_OST;
 229                 ns_type = LDLM_NS_TYPE_OSC;
 230
 231         } else if (!strcmp(name, LUSTRE_MDC_NAME)) {
 232                 rq_portal = MDS_REQUEST_PORTAL;
 233                 rp_portal = MDC_REPLY_PORTAL;
 234                 connect_op = MDS_CONNECT;
 235                 cli->cl_sp_me = LUSTRE_SP_CLI;
 236                 cli->cl_sp_to = LUSTRE_SP_MDT;
 237                 ns_type = LDLM_NS_TYPE_MDC;
 238
 239         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 240                 rq_portal = MGS_REQUEST_PORTAL;
 241                 rp_portal = MGC_REPLY_PORTAL;
 242                 connect_op = MGS_CONNECT;
 243                 cli->cl_sp_me = LUSTRE_SP_MGC;
 244                 cli->cl_sp_to = LUSTRE_SP_MGS;
 245                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 246                 ns_type = LDLM_NS_TYPE_MGC;
 247
 248         } else {
 249                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 250                        name);
 251                 RETURN(-EINVAL);
 252         }
 253
 254         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 255                 CERROR("requires a TARGET UUID\n");
 256                 RETURN(-EINVAL);
 257         }
 258
 259         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 260                 CERROR("client UUID must be less than 38 characters\n");
 261                 RETURN(-EINVAL);
 262         }
 263
 264         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 265                 CERROR("setup requires a SERVER UUID\n");
 266                 RETURN(-EINVAL);
 267         }
 268
 269         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 270                 CERROR("target UUID must be less than 38 characters\n");
 271                 RETURN(-EINVAL);
 272         }
 273
 274         cfs_init_rwsem(&cli->cl_sem);
 275         cfs_sema_init(&cli->cl_mgc_sem, 1);
 276         cli->cl_conn_count = 0;
 277         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 278                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 279                      sizeof(server_uuid)));
 280
 281         cli->cl_dirty = 0;
 282         cli->cl_avail_grant = 0;
 283         /* FIXME: should limit this for the sum of all cl_dirty_max */
 284         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 285         if (cli->cl_dirty_max >> CFS_PAGE_SHIFT > cfs_num_physpages / 8)
 286                 cli->cl_dirty_max = cfs_num_physpages << (CFS_PAGE_SHIFT - 3);
 287         CFS_INIT_LIST_HEAD(&cli->cl_cache_waiters);
 288         CFS_INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 289         CFS_INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 290         CFS_INIT_LIST_HEAD(&cli->cl_loi_write_list);
 291         CFS_INIT_LIST_HEAD(&cli->cl_loi_read_list);
 292         CFS_INIT_LIST_HEAD(&cli->cl_loi_sync_fs_list);
 293         client_obd_list_lock_init(&cli->cl_loi_list_lock);
 294         cli->cl_r_in_flight = 0;
 295         cli->cl_w_in_flight = 0;
 296
 297         cfs_spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 298         cfs_spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 299         cfs_spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 300         cfs_spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 301         cfs_spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 302         cfs_spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 303         cfs_waitq_init(&cli->cl_destroy_waitq);
 304         cfs_atomic_set(&cli->cl_destroy_in_flight, 0);
 305 #ifdef ENABLE_CHECKSUM
 306         /* Turn on checksumming by default. */
 307         cli->cl_checksum = 1;
 308         /*
 309          * The supported checksum types will be worked out at connect time
 310          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 311          * through procfs.
 312          */
 313         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 314 #endif
 315         cfs_atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 316
 317         /* This value may be changed at connect time in
 318            ptlrpc_connect_interpret. */
 319         cli->cl_max_pages_per_rpc = min((int)PTLRPC_MAX_BRW_PAGES,
 320                                         (int)(1024 * 1024 >> CFS_PAGE_SHIFT));
 321
 322         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 323                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
 324         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 128 /* MB */) {
 325                 cli->cl_max_rpcs_in_flight = 2;
 326         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 256 /* MB */) {
 327                 cli->cl_max_rpcs_in_flight = 3;
 328         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 512 /* MB */) {
 329                 cli->cl_max_rpcs_in_flight = 4;
 330         } else {
 331                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 332         }
 333
 334         rc = ldlm_get_ref();
 335         if (rc) {
 336                 CERROR("ldlm_get_ref failed: %d\n", rc);
 337                 GOTO(err, rc);
 338         }
 339
 340         ptlrpc_init_client(rq_portal, rp_portal, name,
 341                            &obddev->obd_ldlm_client);
 342
 343         imp = class_new_import(obddev);
 344         if (imp == NULL)
 345                 GOTO(err_ldlm, rc = -ENOENT);
 346         imp->imp_client = &obddev->obd_ldlm_client;
 347         imp->imp_connect_op = connect_op;
 348         CFS_INIT_LIST_HEAD(&imp->imp_pinger_chain);
 349         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 350                LUSTRE_CFG_BUFLEN(lcfg, 1));
 351         class_import_put(imp);
 352
 353         rc = client_import_add_conn(imp, &server_uuid, 1);
 354         if (rc) {
 355                 CERROR("can't add initial connection\n");
 356                 GOTO(err_import, rc);
 357         }
 358
 359         cli->cl_import = imp;
 360         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 361         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 362         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 363
 364         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 365                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 366                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 367                                name, obddev->obd_name,
 368                                cli->cl_target_uuid.uuid);
 369                         cfs_spin_lock(&imp->imp_lock);
 370                         imp->imp_deactive = 1;
 371                         cfs_spin_unlock(&imp->imp_lock);
 372                 }
 373         }
 374
 375         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 376                                                    LDLM_NAMESPACE_CLIENT,
 377                                                    LDLM_NAMESPACE_GREEDY,
 378                                                    ns_type);
 379         if (obddev->obd_namespace == NULL) {
 380                 CERROR("Unable to create client namespace - %s\n",
 381                        obddev->obd_name);
 382                 GOTO(err_import, rc = -ENOMEM);
 383         }
 384
 385         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 386
 387         RETURN(rc);
 388
 389 err_import:
 390         class_destroy_import(imp);
 391 err_ldlm:
 392         ldlm_put_ref();
 393 err:
 394         RETURN(rc);
 395
 396 }
 397
 398 int client_obd_cleanup(struct obd_device *obddev)
 399 {
 400         ENTRY;
 401
 402         ldlm_namespace_free_post(obddev->obd_namespace);
 403         obddev->obd_namespace = NULL;
 404
 405         ldlm_put_ref();
 406         RETURN(0);
 407 }
 408
 409 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 410 int client_connect_import(const struct lu_env *env,
 411                           struct obd_export **exp,
 412                           struct obd_device *obd, struct obd_uuid *cluuid,
 413                           struct obd_connect_data *data, void *localdata)
 414 {
 415         struct client_obd *cli = &obd->u.cli;
 416         struct obd_import *imp = cli->cl_import;
 417         struct obd_connect_data *ocd;
 418         struct lustre_handle conn = { 0 };
 419         int rc;
 420         ENTRY;
 421
 422         *exp = NULL;
 423         cfs_down_write(&cli->cl_sem);
 424         if (cli->cl_conn_count > 0 )
 425                 GOTO(out_sem, rc = -EALREADY);
 426
 427         rc = class_connect(&conn, obd, cluuid);
 428         if (rc)
 429                 GOTO(out_sem, rc);
 430
 431         cli->cl_conn_count++;
 432         *exp = class_conn2export(&conn);
 433
 434         LASSERT(obd->obd_namespace);
 435
 436         imp->imp_dlm_handle = conn;
 437         rc = ptlrpc_init_import(imp);
 438         if (rc != 0)
 439                 GOTO(out_ldlm, rc);
 440
 441         ocd = &imp->imp_connect_data;
 442         if (data) {
 443                 *ocd = *data;
 444                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 445         }
 446
 447         rc = ptlrpc_connect_import(imp, NULL);
 448         if (rc != 0) {
 449                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 450                 GOTO(out_ldlm, rc);
 451         }
 452         LASSERT((*exp)->exp_connection);
 453
 454         if (data) {
 455                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 456                          ocd->ocd_connect_flags, "old "LPX64", new "LPX64"\n",
 457                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 458                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 459         }
 460
 461         ptlrpc_pinger_add_import(imp);
 462
 463         EXIT;
 464
 465         if (rc) {
 466 out_ldlm:
 467                 cli->cl_conn_count--;
 468                 class_disconnect(*exp);
 469                 *exp = NULL;
 470         }
 471 out_sem:
 472         cfs_up_write(&cli->cl_sem);
 473
 474         return rc;
 475 }
 476
 477 int client_disconnect_export(struct obd_export *exp)
 478 {
 479         struct obd_device *obd = class_exp2obd(exp);
 480         struct client_obd *cli;
 481         struct obd_import *imp;
 482         int rc = 0, err;
 483         ENTRY;
 484
 485         if (!obd) {
 486                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 487                        exp, exp ? exp->exp_handle.h_cookie : -1);
 488                 RETURN(-EINVAL);
 489         }
 490
 491         cli = &obd->u.cli;
 492         imp = cli->cl_import;
 493
 494         cfs_down_write(&cli->cl_sem);
 495         CDEBUG(D_INFO, "disconnect %s - %d\n", obd->obd_name,
 496                cli->cl_conn_count);
 497
 498         if (!cli->cl_conn_count) {
 499                 CERROR("disconnecting disconnected device (%s)\n",
 500                        obd->obd_name);
 501                 GOTO(out_disconnect, rc = -EINVAL);
 502         }
 503
 504         cli->cl_conn_count--;
 505         if (cli->cl_conn_count)
 506                 GOTO(out_disconnect, rc = 0);
 507
 508         /* Mark import deactivated now, so we don't try to reconnect if any
 509          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
 510          * fully deactivate the import, or that would drop all requests. */
 511         cfs_spin_lock(&imp->imp_lock);
 512         imp->imp_deactive = 1;
 513         cfs_spin_unlock(&imp->imp_lock);
 514
 515         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 516          * delete it regardless.  (It's safe to delete an import that was
 517          * never added.) */
 518         (void)ptlrpc_pinger_del_import(imp);
 519
 520         if (obd->obd_namespace != NULL) {
 521                 /* obd_force == local only */
 522                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 523                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 524                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 525         }
 526
 527         /*
 528          * there's no need to hold sem during disconnecting an import,
 529          * and actually it may cause deadlock in gss.
 530          */
 531         cfs_up_write(&cli->cl_sem);
 532         rc = ptlrpc_disconnect_import(imp, 0);
 533         cfs_down_write(&cli->cl_sem);
 534
 535         ptlrpc_invalidate_import(imp);
 536
 537         if (imp->imp_rq_pool) {
 538                 ptlrpc_free_rq_pool(imp->imp_rq_pool);
 539                 imp->imp_rq_pool = NULL;
 540         }
 541         client_destroy_import(imp);
 542         cli->cl_import = NULL;
 543
 544         EXIT;
 545
 546  out_disconnect:
 547         /* use server style - class_disconnect should be always called for
 548          * o_disconnect */
 549         err = class_disconnect(exp);
 550         if (!rc && err)
 551                 rc = err;
 552
 553         cfs_up_write(&cli->cl_sem);
 554
 555         RETURN(rc);
 556 }
 557
 558 int server_disconnect_export(struct obd_export *exp)
 559 {
 560         int rc;
 561         ENTRY;
 562
 563         /* Disconnect early so that clients can't keep using export */
 564         rc = class_disconnect(exp);
 565         /* close import for avoid sending any requests */
 566         if (exp->exp_imp_reverse)
 567                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 568
 569         if (exp->exp_obd->obd_namespace != NULL)
 570                 ldlm_cancel_locks_for_export(exp);
 571
 572         /* complete all outstanding replies */
 573         cfs_spin_lock(&exp->exp_lock);
 574         while (!cfs_list_empty(&exp->exp_outstanding_replies)) {
 575                 struct ptlrpc_reply_state *rs =
 576                         cfs_list_entry(exp->exp_outstanding_replies.next,
 577                                        struct ptlrpc_reply_state, rs_exp_list);
 578                 struct ptlrpc_service *svc = rs->rs_service;
 579
 580                 cfs_spin_lock(&svc->srv_rs_lock);
 581                 cfs_list_del_init(&rs->rs_exp_list);
 582                 cfs_spin_lock(&rs->rs_lock);
 583                 ptlrpc_schedule_difficult_reply(rs);
 584                 cfs_spin_unlock(&rs->rs_lock);
 585                 cfs_spin_unlock(&svc->srv_rs_lock);
 586         }
 587         cfs_spin_unlock(&exp->exp_lock);
 588
 589         RETURN(rc);
 590 }
 591
 592 /* --------------------------------------------------------------------------
 593  * from old lib/target.c
 594  * -------------------------------------------------------------------------- */
 595
 596 static int target_handle_reconnect(struct lustre_handle *conn,
 597                                    struct obd_export *exp,
 598                                    struct obd_uuid *cluuid)
 599 {
 600         ENTRY;
 601         if (exp->exp_connection && exp->exp_imp_reverse) {
 602                 struct lustre_handle *hdl;
 603                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 604                 /* Might be a re-connect after a partition. */
 605                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 606                         CWARN("%s: %s reconnecting\n", exp->exp_obd->obd_name,
 607                               cluuid->uuid);
 608                         conn->cookie = exp->exp_handle.h_cookie;
 609                         /* target_handle_connect() treats EALREADY and
 610                          * -EALREADY differently.  EALREADY means we are
 611                          * doing a valid reconnect from the same client. */
 612                         RETURN(EALREADY);
 613                 } else {
 614                         CERROR("%s reconnecting from %s, "
 615                                "handle mismatch (ours "LPX64", theirs "
 616                                LPX64")\n", cluuid->uuid,
 617                                exp->exp_connection->c_remote_uuid.uuid,
 618                                hdl->cookie, conn->cookie);
 619                         memset(conn, 0, sizeof *conn);
 620                         /* target_handle_connect() treats EALREADY and
 621                          * -EALREADY differently.  -EALREADY is an error
 622                          * (same UUID, different handle). */
 623                         RETURN(-EALREADY);
 624                 }
 625         }
 626
 627         conn->cookie = exp->exp_handle.h_cookie;
 628         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
 629                cluuid->uuid, exp, conn->cookie);
 630         RETURN(0);
 631 }
 632
 633 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
 634                           int error)
 635 {
 636         struct obd_export *exp = cb_data;
 637
 638         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 639                obd->obd_name, exp->exp_client_uuid.uuid);
 640
 641         cfs_spin_lock(&exp->exp_lock);
 642         exp->exp_need_sync = 0;
 643         cfs_spin_unlock(&exp->exp_lock);
 644         class_export_cb_put(exp);
 645 }
 646 EXPORT_SYMBOL(target_client_add_cb);
 647
 648 static void
 649 target_start_and_reset_recovery_timer(struct obd_device *obd,
 650                                       struct ptlrpc_request *req,
 651                                       int new_client);
 652
 653 int target_handle_connect(struct ptlrpc_request *req)
 654 {
 655         struct obd_device *target, *targref = NULL;
 656         struct obd_export *export = NULL;
 657         struct obd_import *revimp;
 658         struct lustre_handle conn;
 659         struct lustre_handle *tmp;
 660         struct obd_uuid tgtuuid;
 661         struct obd_uuid cluuid;
 662         struct obd_uuid remote_uuid;
 663         char *str;
 664         int rc = 0;
 665         int mds_conn = 0;
 666         struct obd_connect_data *data, *tmpdata;
 667         lnet_nid_t *client_nid = NULL;
 668         ENTRY;
 669
 670         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 671
 672         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 673         if (str == NULL) {
 674                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 675                 GOTO(out, rc = -EINVAL);
 676         }
 677
 678         obd_str2uuid(&tgtuuid, str);
 679         target = class_uuid2obd(&tgtuuid);
 680         if (!target)
 681                 target = class_name2obd(str);
 682
 683         if (!target || target->obd_stopping || !target->obd_set_up) {
 684                 LCONSOLE_ERROR_MSG(0x137, "UUID '%s' is not available "
 685                                    " for connect (%s)\n", str,
 686                                    !target ? "no target" :
 687                                    (target->obd_stopping ? "stopping" :
 688                                    "not set up"));
 689                 GOTO(out, rc = -ENODEV);
 690         }
 691
 692         if (target->obd_no_conn) {
 693                 LCONSOLE_WARN("%s: temporarily refusing client connection "
 694                               "from %s\n", target->obd_name,
 695                               libcfs_nid2str(req->rq_peer.nid));
 696                 GOTO(out, rc = -EAGAIN);
 697         }
 698
 699         /* Make sure the target isn't cleaned up while we're here. Yes,
 700            there's still a race between the above check and our incref here.
 701            Really, class_uuid2obd should take the ref. */
 702         targref = class_incref(target, __FUNCTION__, cfs_current());
 703
 704
 705         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
 706         if (str == NULL) {
 707                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
 708                 GOTO(out, rc = -EINVAL);
 709         }
 710
 711         obd_str2uuid(&cluuid, str);
 712
 713         /* XXX extract a nettype and format accordingly */
 714         switch (sizeof(lnet_nid_t)) {
 715                 /* NB the casts only avoid compiler warnings */
 716         case 8:
 717                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 718                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
 719                 break;
 720         case 4:
 721                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 722                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
 723                 break;
 724         default:
 725                 LBUG();
 726         }
 727
 728         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 729         if (tmp == NULL)
 730                 GOTO(out, rc = -EPROTO);
 731
 732         conn = *tmp;
 733
 734         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 735         if (!data)
 736                 GOTO(out, rc = -EPROTO);
 737
 738         rc = req_capsule_server_pack(&req->rq_pill);
 739         if (rc)
 740                 GOTO(out, rc);
 741
 742         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 743                 if (!data) {
 744                         DEBUG_REQ(D_WARNING, req, "Refusing old (unversioned) "
 745                                   "libclient connection attempt");
 746                         GOTO(out, rc = -EPROTO);
 747                 } else if (data->ocd_version < LUSTRE_VERSION_CODE -
 748                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
 749                            data->ocd_version > LUSTRE_VERSION_CODE +
 750                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
 751                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
 752                                   "libclient connection attempt",
 753                                   data->ocd_version < LUSTRE_VERSION_CODE ?
 754                                   "old" : "new",
 755                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
 756                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
 757                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
 758                                   OBD_OCD_VERSION_FIX(data->ocd_version));
 759                         data = req_capsule_server_sized_get(&req->rq_pill,
 760                                                         &RMF_CONNECT_DATA,
 761                                     offsetof(typeof(*data), ocd_version) +
 762                                              sizeof(data->ocd_version));
 763                         if (data) {
 764                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
 765                                 data->ocd_version = LUSTRE_VERSION_CODE;
 766                         }
 767                         GOTO(out, rc = -EPROTO);
 768                 }
 769         }
 770
 771         if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) &&
 772             (data->ocd_connect_flags & OBD_CONNECT_MDS))
 773                 mds_conn = 1;
 774
 775         /* lctl gets a backstage, all-access pass. */
 776         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 777                 goto dont_check_exports;
 778
 779         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
 780         if (!export)
 781                 goto no_export;
 782
 783         /* we've found an export in the hash */
 784         if (export->exp_connecting) { /* bug 9635, et. al. */
 785                 CWARN("%s: exp %p already connecting\n",
 786                       export->exp_obd->obd_name, export);
 787                 class_export_put(export);
 788                 export = NULL;
 789                 rc = -EALREADY;
 790         } else if (mds_conn && export->exp_connection) {
 791                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid)
 792                         /* mds reconnected after failover */
 793                         CWARN("%s: received MDS connection from NID %s,"
 794                               " removing former export from NID %s\n",
 795                             target->obd_name, libcfs_nid2str(req->rq_peer.nid),
 796                             libcfs_nid2str(export->exp_connection->c_peer.nid));
 797                 else
 798                         /* new mds connection from the same nid */
 799                         CWARN("%s: received new MDS connection from NID %s,"
 800                               " removing former export from same NID\n",
 801                             target->obd_name, libcfs_nid2str(req->rq_peer.nid));
 802                 class_fail_export(export);
 803                 class_export_put(export);
 804                 export = NULL;
 805                 rc = 0;
 806         } else if (export->exp_connection != NULL &&
 807                    req->rq_peer.nid != export->exp_connection->c_peer.nid &&
 808                    (lustre_msg_get_op_flags(req->rq_reqmsg) &
 809                     MSG_CONNECT_INITIAL)) {
 810                 /* in mds failover we have static uuid but nid can be
 811                  * changed*/
 812                 CWARN("%s: cookie %s seen on new NID %s when "
 813                       "existing NID %s is already connected\n",
 814                       target->obd_name, cluuid.uuid,
 815                       libcfs_nid2str(req->rq_peer.nid),
 816                       libcfs_nid2str(export->exp_connection->c_peer.nid));
 817                 rc = -EALREADY;
 818                 class_export_put(export);
 819                 export = NULL;
 820         } else {
 821                 cfs_spin_lock(&export->exp_lock);
 822                 export->exp_connecting = 1;
 823                 cfs_spin_unlock(&export->exp_lock);
 824                 class_export_put(export);
 825                 LASSERT(export->exp_obd == target);
 826
 827                 rc = target_handle_reconnect(&conn, export, &cluuid);
 828         }
 829
 830         /* If we found an export, we already unlocked. */
 831         if (!export) {
 832 no_export:
 833                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
 834         } else if (req->rq_export == NULL &&
 835                    cfs_atomic_read(&export->exp_rpc_count) > 0) {
 836                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
 837                       target->obd_name, cluuid.uuid,
 838                       libcfs_nid2str(req->rq_peer.nid),
 839                       export, cfs_atomic_read(&export->exp_refcount));
 840                 GOTO(out, rc = -EBUSY);
 841         } else if (req->rq_export != NULL &&
 842                    (cfs_atomic_read(&export->exp_rpc_count) > 1)) {
 843                 /* the current connect rpc has increased exp_rpc_count */
 844                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
 845                       target->obd_name, cluuid.uuid,
 846                       libcfs_nid2str(req->rq_peer.nid),
 847                       export, cfs_atomic_read(&export->exp_rpc_count) - 1);
 848                 cfs_spin_lock(&export->exp_lock);
 849                 if (req->rq_export->exp_conn_cnt <
 850                     lustre_msg_get_conn_cnt(req->rq_reqmsg))
 851                         /* try to abort active requests */
 852                         req->rq_export->exp_abort_active_req = 1;
 853                 cfs_spin_unlock(&export->exp_lock);
 854                 GOTO(out, rc = -EBUSY);
 855         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
 856                 CERROR("%s: NID %s (%s) reconnected with 1 conn_cnt; "
 857                        "cookies not random?\n", target->obd_name,
 858                        libcfs_nid2str(req->rq_peer.nid), cluuid.uuid);
 859                 GOTO(out, rc = -EALREADY);
 860         } else {
 861                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
 862         }
 863
 864         if (rc < 0) {
 865                 GOTO(out, rc);
 866         }
 867
 868         CWARN("%s: connection from %s@%s %st"LPU64" exp %p cur %ld last %ld\n",
 869                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 870               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
 871               export, (long)cfs_time_current_sec(),
 872               export ? (long)export->exp_last_request_time : 0);
 873
 874         /* Tell the client if we're in recovery. */
 875         if (target->obd_recovering) {
 876                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 877                 /* If this is the first time a client connects,
 878                    reset the recovery timer */
 879                 if (rc == 0)
 880                         target_start_and_reset_recovery_timer(target, req,
 881                                                               !export);
 882         }
 883
 884         /* We want to handle EALREADY but *not* -EALREADY from
 885          * target_handle_reconnect(), return reconnection state in a flag */
 886         if (rc == EALREADY) {
 887                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 888                 rc = 0;
 889         } else {
 890                 LASSERT(rc == 0);
 891         }
 892
 893         /* Tell the client if we support replayable requests */
 894         if (target->obd_replayable)
 895                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 896         client_nid = &req->rq_peer.nid;
 897
 898         if (export == NULL) {
 899                 if (target->obd_recovering) {
 900                         cfs_time_t t;
 901
 902                         t = cfs_timer_deadline(&target->obd_recovery_timer);
 903                         t = cfs_time_sub(t, cfs_time_current());
 904                         CERROR("%s: denying connection for new client %s (%s): "
 905                                "%d clients in recovery for "CFS_TIME_T"s\n",
 906                                target->obd_name,
 907                                libcfs_nid2str(req->rq_peer.nid), cluuid.uuid,
 908                                cfs_atomic_read(&target-> \
 909                                                obd_lock_replay_clients),
 910                                cfs_duration_sec(t));
 911                         rc = -EBUSY;
 912                 } else {
 913 dont_check_exports:
 914                         rc = obd_connect(req->rq_svc_thread->t_env,
 915                                          &export, target, &cluuid, data,
 916                                          client_nid);
 917                         if (rc == 0)
 918                                 conn.cookie = export->exp_handle.h_cookie;
 919                 }
 920         } else {
 921                 rc = obd_reconnect(req->rq_svc_thread->t_env,
 922                                    export, target, &cluuid, data, client_nid);
 923                 if (rc == 0)
 924                         /* prevous done via class_conn2export */
 925                         class_export_get(export);
 926         }
 927         if (rc)
 928                 GOTO(out, rc);
 929         /* Return only the parts of obd_connect_data that we understand, so the
 930          * client knows that we don't understand the rest. */
 931         if (data) {
 932                  tmpdata = req_capsule_server_get(&req->rq_pill,
 933                                                   &RMF_CONNECT_DATA);
 934                   //data->ocd_connect_flags &= OBD_CONNECT_SUPPORTED;
 935                  *tmpdata = *data;
 936         }
 937
 938         /* If all else goes well, this is our RPC return code. */
 939         req->rq_status = 0;
 940
 941         lustre_msg_set_handle(req->rq_repmsg, &conn);
 942
 943         /* If the client and the server are the same node, we will already
 944          * have an export that really points to the client's DLM export,
 945          * because we have a shared handles table.
 946          *
 947          * XXX this will go away when shaver stops sending the "connect" handle
 948          * in the real "remote handle" field of the request --phik 24 Apr 2003
 949          */
 950         if (req->rq_export != NULL)
 951                 class_export_put(req->rq_export);
 952
 953         req->rq_export = export;
 954
 955         cfs_spin_lock(&export->exp_lock);
 956         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
 957                 cfs_spin_unlock(&export->exp_lock);
 958                 CERROR("%s: %s already connected at higher conn_cnt: %d > %d\n",
 959                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 960                        export->exp_conn_cnt,
 961                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
 962
 963                 GOTO(out, rc = -EALREADY);
 964         }
 965         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
 966         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
 967         export->exp_abort_active_req = 0;
 968
 969         /* request from liblustre?  Don't evict it for not pinging. */
 970         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 971                 export->exp_libclient = 1;
 972                 cfs_spin_unlock(&export->exp_lock);
 973
 974                 cfs_spin_lock(&target->obd_dev_lock);
 975                 cfs_list_del_init(&export->exp_obd_chain_timed);
 976                 cfs_spin_unlock(&target->obd_dev_lock);
 977         } else {
 978                 cfs_spin_unlock(&export->exp_lock);
 979         }
 980
 981         if (export->exp_connection != NULL) {
 982                 /* Check to see if connection came from another NID */
 983                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
 984                     !cfs_hlist_unhashed(&export->exp_nid_hash))
 985                         cfs_hash_del(export->exp_obd->obd_nid_hash,
 986                                      &export->exp_connection->c_peer.nid,
 987                                      &export->exp_nid_hash);
 988
 989                 ptlrpc_connection_put(export->exp_connection);
 990         }
 991
 992         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
 993                                                        req->rq_self,
 994                                                        &remote_uuid);
 995         if (cfs_hlist_unhashed(&export->exp_nid_hash)) {
 996                 cfs_hash_add(export->exp_obd->obd_nid_hash,
 997                              &export->exp_connection->c_peer.nid,
 998                              &export->exp_nid_hash);
 999         }
1000
1001         cfs_spin_lock(&target->obd_recovery_task_lock);
1002         if (target->obd_recovering && !export->exp_in_recovery) {
1003                 cfs_spin_lock(&export->exp_lock);
1004                 export->exp_in_recovery = 1;
1005                 export->exp_req_replay_needed = 1;
1006                 export->exp_lock_replay_needed = 1;
1007                 cfs_spin_unlock(&export->exp_lock);
1008                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
1009                      && (data->ocd_transno == 0))
1010                         CWARN("Connect with zero transno!\n");
1011
1012                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
1013                      && data->ocd_transno < target->obd_next_recovery_transno)
1014                         target->obd_next_recovery_transno = data->ocd_transno;
1015                 target->obd_connected_clients++;
1016                 cfs_atomic_inc(&target->obd_req_replay_clients);
1017                 cfs_atomic_inc(&target->obd_lock_replay_clients);
1018                 if (target->obd_connected_clients ==
1019                     target->obd_max_recoverable_clients)
1020                         cfs_waitq_signal(&target->obd_next_transno_waitq);
1021         }
1022         cfs_spin_unlock(&target->obd_recovery_task_lock);
1023         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1024         conn = *tmp;
1025
1026         if (export->exp_imp_reverse != NULL) {
1027                 /* destroyed import can be still referenced in ctxt */
1028                 obd_set_info_async(export, sizeof(KEY_REVIMP_UPD),
1029                                    KEY_REVIMP_UPD, 0, NULL, NULL);
1030
1031                 client_destroy_import(export->exp_imp_reverse);
1032         }
1033
1034         /* for the rest part, we return -ENOTCONN in case of errors
1035          * in order to let client initialize connection again.
1036          */
1037         revimp = export->exp_imp_reverse = class_new_import(target);
1038         if (!revimp) {
1039                 CERROR("fail to alloc new reverse import.\n");
1040                 GOTO(out, rc = -ENOTCONN);
1041         }
1042
1043         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
1044         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
1045         revimp->imp_remote_handle = conn;
1046         revimp->imp_dlm_fake = 1;
1047         revimp->imp_state = LUSTRE_IMP_FULL;
1048
1049         /* unknown versions will be caught in
1050          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
1051         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1052
1053         if ((export->exp_connect_flags & OBD_CONNECT_AT) &&
1054             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1055                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1056         else
1057                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1058
1059         if ((export->exp_connect_flags & OBD_CONNECT_FULL20) &&
1060             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1061                 revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
1062         else
1063                 revimp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
1064
1065         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
1066         if (rc) {
1067                 CERROR("Failed to get sec for reverse import: %d\n", rc);
1068                 export->exp_imp_reverse = NULL;
1069                 class_destroy_import(revimp);
1070         }
1071
1072         class_import_put(revimp);
1073 out:
1074         if (export) {
1075                 cfs_spin_lock(&export->exp_lock);
1076                 export->exp_connecting = 0;
1077                 cfs_spin_unlock(&export->exp_lock);
1078         }
1079         if (targref)
1080                 class_decref(targref, __FUNCTION__, cfs_current());
1081         if (rc)
1082                 req->rq_status = rc;
1083         RETURN(rc);
1084 }
1085
1086 int target_handle_disconnect(struct ptlrpc_request *req)
1087 {
1088         int rc;
1089         ENTRY;
1090
1091         rc = req_capsule_server_pack(&req->rq_pill);
1092         if (rc)
1093                 RETURN(rc);
1094
1095         /* keep the rq_export around so we can send the reply */
1096         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1097
1098         RETURN(0);
1099 }
1100
1101 void target_destroy_export(struct obd_export *exp)
1102 {
1103         /* exports created from last_rcvd data, and "fake"
1104            exports created by lctl don't have an import */
1105         if (exp->exp_imp_reverse != NULL)
1106                 client_destroy_import(exp->exp_imp_reverse);
1107
1108         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1109         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1110         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1111         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1112 }
1113
1114 /*
1115  * Recovery functions
1116  */
1117 static void target_request_copy_get(struct ptlrpc_request *req)
1118 {
1119         class_export_rpc_get(req->rq_export);
1120         LASSERT(cfs_list_empty(&req->rq_list));
1121         CFS_INIT_LIST_HEAD(&req->rq_replay_list);
1122
1123         /* increase refcount to keep request in queue */
1124         cfs_atomic_inc(&req->rq_refcount);
1125         /** let export know it has replays to be handled */
1126         cfs_atomic_inc(&req->rq_export->exp_replay_count);
1127 }
1128
1129 static void target_request_copy_put(struct ptlrpc_request *req)
1130 {
1131         LASSERT(cfs_list_empty(&req->rq_replay_list));
1132         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1133
1134         cfs_atomic_dec(&req->rq_export->exp_replay_count);
1135         class_export_rpc_put(req->rq_export);
1136         ptlrpc_server_drop_request(req);
1137 }
1138
1139 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1140 {
1141         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1142         struct obd_export     *exp = req->rq_export;
1143         struct ptlrpc_request *reqiter;
1144         int                    dup = 0;
1145
1146         LASSERT(exp);
1147
1148         cfs_spin_lock(&exp->exp_lock);
1149         cfs_list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1150                                 rq_replay_list) {
1151                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1152                         dup = 1;
1153                         break;
1154                 }
1155         }
1156
1157         if (dup) {
1158                 /* we expect it with RESENT and REPLAY flags */
1159                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1160                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1161                         CERROR("invalid flags %x of resent replay\n",
1162                                lustre_msg_get_flags(req->rq_reqmsg));
1163         } else {
1164                 cfs_list_add_tail(&req->rq_replay_list,
1165                                   &exp->exp_req_replay_queue);
1166         }
1167
1168         cfs_spin_unlock(&exp->exp_lock);
1169         return dup;
1170 }
1171
1172 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1173 {
1174         LASSERT(!cfs_list_empty(&req->rq_replay_list));
1175         LASSERT(req->rq_export);
1176
1177         cfs_spin_lock(&req->rq_export->exp_lock);
1178         cfs_list_del_init(&req->rq_replay_list);
1179         cfs_spin_unlock(&req->rq_export->exp_lock);
1180 }
1181
1182 #ifdef __KERNEL__
1183 static void target_finish_recovery(struct obd_device *obd)
1184 {
1185         ENTRY;
1186         LCONSOLE_INFO("%s: sending delayed replies to recovered clients\n",
1187                       obd->obd_name);
1188
1189         ldlm_reprocess_all_ns(obd->obd_namespace);
1190         cfs_spin_lock(&obd->obd_recovery_task_lock);
1191         if (!cfs_list_empty(&obd->obd_req_replay_queue) ||
1192             !cfs_list_empty(&obd->obd_lock_replay_queue) ||
1193             !cfs_list_empty(&obd->obd_final_req_queue)) {
1194                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1195                        obd->obd_name,
1196                        cfs_list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1197                        cfs_list_empty(&obd->obd_lock_replay_queue) ? \
1198                                "" : "lock ",
1199                        cfs_list_empty(&obd->obd_final_req_queue) ? \
1200                                "" : "final ");
1201                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1202                 LBUG();
1203         }
1204         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1205
1206         obd->obd_recovery_end = cfs_time_current_sec();
1207
1208         /* when recovery finished, cleanup orphans on mds and ost */
1209         if (OBT(obd) && OBP(obd, postrecov)) {
1210                 int rc = OBP(obd, postrecov)(obd);
1211                 if (rc < 0)
1212                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1213                                       obd->obd_name, rc);
1214         }
1215         EXIT;
1216 }
1217
1218 static void abort_req_replay_queue(struct obd_device *obd)
1219 {
1220         struct ptlrpc_request *req, *n;
1221         cfs_list_t abort_list;
1222
1223         CFS_INIT_LIST_HEAD(&abort_list);
1224         cfs_spin_lock(&obd->obd_recovery_task_lock);
1225         cfs_list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1226         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1227         cfs_list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1228                 DEBUG_REQ(D_WARNING, req, "aborted:");
1229                 req->rq_status = -ENOTCONN;
1230                 if (ptlrpc_error(req)) {
1231                         DEBUG_REQ(D_ERROR, req,
1232                                   "failed abort_req_reply; skipping");
1233                 }
1234                 target_exp_dequeue_req_replay(req);
1235                 target_request_copy_put(req);
1236         }
1237 }
1238
1239 static void abort_lock_replay_queue(struct obd_device *obd)
1240 {
1241         struct ptlrpc_request *req, *n;
1242         cfs_list_t abort_list;
1243
1244         CFS_INIT_LIST_HEAD(&abort_list);
1245         cfs_spin_lock(&obd->obd_recovery_task_lock);
1246         cfs_list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1247         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1248         cfs_list_for_each_entry_safe(req, n, &abort_list, rq_list){
1249                 DEBUG_REQ(D_ERROR, req, "aborted:");
1250                 req->rq_status = -ENOTCONN;
1251                 if (ptlrpc_error(req)) {
1252                         DEBUG_REQ(D_ERROR, req,
1253                                   "failed abort_lock_reply; skipping");
1254                 }
1255                 target_request_copy_put(req);
1256         }
1257 }
1258 #endif
1259
1260 /* Called from a cleanup function if the device is being cleaned up
1261    forcefully.  The exports should all have been disconnected already,
1262    the only thing left to do is
1263      - clear the recovery flags
1264      - cancel the timer
1265      - free queued requests and replies, but don't send replies
1266    Because the obd_stopping flag is set, no new requests should be received.
1267
1268 */
1269 void target_cleanup_recovery(struct obd_device *obd)
1270 {
1271         struct ptlrpc_request *req, *n;
1272         cfs_list_t clean_list;
1273         ENTRY;
1274
1275         CFS_INIT_LIST_HEAD(&clean_list);
1276         cfs_spin_lock(&obd->obd_dev_lock);
1277         if (!obd->obd_recovering) {
1278                 cfs_spin_unlock(&obd->obd_dev_lock);
1279                 EXIT;
1280                 return;
1281         }
1282         obd->obd_recovering = obd->obd_abort_recovery = 0;
1283         cfs_spin_unlock(&obd->obd_dev_lock);
1284
1285         cfs_spin_lock(&obd->obd_recovery_task_lock);
1286         target_cancel_recovery_timer(obd);
1287         cfs_list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1288         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1289
1290         cfs_list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1291                 LASSERT(req->rq_reply_state == 0);
1292                 target_exp_dequeue_req_replay(req);
1293                 target_request_copy_put(req);
1294         }
1295
1296         cfs_spin_lock(&obd->obd_recovery_task_lock);
1297         cfs_list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1298         cfs_list_splice_init(&obd->obd_final_req_queue, &clean_list);
1299         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1300
1301         cfs_list_for_each_entry_safe(req, n, &clean_list, rq_list){
1302                 LASSERT(req->rq_reply_state == 0);
1303                 target_request_copy_put(req);
1304         }
1305
1306         EXIT;
1307 }
1308
1309 /* obd_recovery_task_lock should be held */
1310 void target_cancel_recovery_timer(struct obd_device *obd)
1311 {
1312         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1313         cfs_timer_disarm(&obd->obd_recovery_timer);
1314 }
1315
1316 /* extend = 1 means require at least "duration" seconds left in the timer,
1317    extend = 0 means set the total duration (start_recovery_timer) */
1318 static void reset_recovery_timer(struct obd_device *obd, int duration,
1319                                  int extend)
1320 {
1321         cfs_time_t now = cfs_time_current_sec();
1322         cfs_duration_t left;
1323
1324         cfs_spin_lock(&obd->obd_recovery_task_lock);
1325         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1326                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1327                 return;
1328         }
1329
1330         left = cfs_time_sub(obd->obd_recovery_end, now);
1331
1332         if (extend && (duration > left))
1333                 obd->obd_recovery_timeout += duration - left;
1334         else if (!extend && (duration > obd->obd_recovery_timeout))
1335                 /* Track the client's largest expected replay time */
1336                 obd->obd_recovery_timeout = duration;
1337
1338         /* Hard limit of obd_recovery_time_hard which should not happen */
1339         if (obd->obd_recovery_timeout > obd->obd_recovery_time_hard)
1340                 obd->obd_recovery_timeout = obd->obd_recovery_time_hard;
1341
1342         obd->obd_recovery_end = obd->obd_recovery_start +
1343                                 obd->obd_recovery_timeout;
1344         if (!cfs_timer_is_armed(&obd->obd_recovery_timer) ||
1345             cfs_time_before(now, obd->obd_recovery_end)) {
1346                 left = cfs_time_sub(obd->obd_recovery_end, now);
1347                 cfs_timer_arm(&obd->obd_recovery_timer, cfs_time_shift(left));
1348         }
1349         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1350         CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
1351                obd->obd_name, (unsigned)left);
1352 }
1353
1354 static void check_and_start_recovery_timer(struct obd_device *obd)
1355 {
1356         cfs_spin_lock(&obd->obd_recovery_task_lock);
1357         if (cfs_timer_is_armed(&obd->obd_recovery_timer)) {
1358                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1359                 return;
1360         }
1361         CDEBUG(D_HA, "%s: starting recovery timer\n", obd->obd_name);
1362         obd->obd_recovery_start = cfs_time_current_sec();
1363         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1364
1365         reset_recovery_timer(obd, obd->obd_recovery_timeout, 0);
1366 }
1367
1368 /* Reset the timer with each new client connection */
1369 /*
1370  * This timer is actually reconnect_timer, which is for making sure
1371  * the total recovery window is at least as big as my reconnect
1372  * attempt timing. So the initial recovery time_out will be set to
1373  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1374  * from client is bigger than this, then the recovery time_out will
1375  * be extended to make sure the client could be reconnected, in the
1376  * process, the timeout from the new client should be ignored.
1377  */
1378
1379 static void
1380 target_start_and_reset_recovery_timer(struct obd_device *obd,
1381                                       struct ptlrpc_request *req,
1382                                       int new_client)
1383 {
1384         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1385
1386         if (!new_client && service_time)
1387                 /* Teach server about old server's estimates, as first guess
1388                  * at how long new requests will take. */
1389                 at_measured(&req->rq_rqbd->rqbd_service->srv_at_estimate,
1390                             service_time);
1391
1392         check_and_start_recovery_timer(obd);
1393
1394         /* convert the service time to rpc timeout,
1395          * reuse service_time to limit stack usage */
1396         service_time = at_est2timeout(service_time);
1397
1398         /* We expect other clients to timeout within service_time, then try
1399          * to reconnect, then try the failover server.  The max delay between
1400          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL */
1401         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC +
1402                              INITIAL_CONNECT_TIMEOUT);
1403         if (service_time > obd->obd_recovery_timeout && !new_client)
1404                 reset_recovery_timer(obd, service_time, 0);
1405 }
1406
1407 #ifdef __KERNEL__
1408
1409 /** Health checking routines */
1410 static inline int exp_connect_healthy(struct obd_export *exp)
1411 {
1412         return (exp->exp_in_recovery);
1413 }
1414
1415 /** if export done req_replay or has replay in queue */
1416 static inline int exp_req_replay_healthy(struct obd_export *exp)
1417 {
1418         return (!exp->exp_req_replay_needed ||
1419                 cfs_atomic_read(&exp->exp_replay_count) > 0);
1420 }
1421 /** if export done lock_replay or has replay in queue */
1422 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1423 {
1424         return (!exp->exp_lock_replay_needed ||
1425                 cfs_atomic_read(&exp->exp_replay_count) > 0);
1426 }
1427
1428 static inline int exp_vbr_healthy(struct obd_export *exp)
1429 {
1430         return (!exp->exp_vbr_failed);
1431 }
1432
1433 static inline int exp_finished(struct obd_export *exp)
1434 {
1435         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1436 }
1437
1438 /** Checking routines for recovery */
1439 static int check_for_clients(struct obd_device *obd)
1440 {
1441         if (obd->obd_abort_recovery || obd->obd_recovery_expired)
1442                 return 1;
1443         LASSERT(obd->obd_connected_clients <= obd->obd_max_recoverable_clients);
1444         if (obd->obd_no_conn == 0 &&
1445             obd->obd_connected_clients + obd->obd_stale_clients ==
1446             obd->obd_max_recoverable_clients)
1447                 return 1;
1448         return 0;
1449 }
1450
1451 static int check_for_next_transno(struct obd_device *obd)
1452 {
1453         struct ptlrpc_request *req = NULL;
1454         int wake_up = 0, connected, completed, queue_len;
1455         __u64 next_transno, req_transno;
1456         ENTRY;
1457
1458         cfs_spin_lock(&obd->obd_recovery_task_lock);
1459         if (!cfs_list_empty(&obd->obd_req_replay_queue)) {
1460                 req = cfs_list_entry(obd->obd_req_replay_queue.next,
1461                                      struct ptlrpc_request, rq_list);
1462                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1463         } else {
1464                 req_transno = 0;
1465         }
1466
1467         connected = obd->obd_connected_clients;
1468         completed = connected - cfs_atomic_read(&obd->obd_req_replay_clients);
1469         queue_len = obd->obd_requests_queued_for_recovery;
1470         next_transno = obd->obd_next_recovery_transno;
1471
1472         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1473                "req_transno: "LPU64", next_transno: "LPU64"\n",
1474                obd->obd_max_recoverable_clients, connected, completed,
1475                queue_len, req_transno, next_transno);
1476
1477         if (obd->obd_abort_recovery) {
1478                 CDEBUG(D_HA, "waking for aborted recovery\n");
1479                 wake_up = 1;
1480         } else if (obd->obd_recovery_expired) {
1481                 CDEBUG(D_HA, "waking for expired recovery\n");
1482                 wake_up = 1;
1483         } else if (cfs_atomic_read(&obd->obd_req_replay_clients) == 0) {
1484                 CDEBUG(D_HA, "waking for completed recovery\n");
1485                 wake_up = 1;
1486         } else if (req_transno == next_transno) {
1487                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1488                 wake_up = 1;
1489         } else if (queue_len == cfs_atomic_read(&obd->obd_req_replay_clients)) {
1490                 int d_lvl = D_HA;
1491                 /** handle gaps occured due to lost reply or VBR */
1492                 LASSERTF(req_transno >= next_transno,
1493                          "req_transno: "LPU64", next_transno: "LPU64"\n",
1494                          req_transno, next_transno);
1495                 if (req_transno > obd->obd_last_committed &&
1496                     !obd->obd_version_recov)
1497                         d_lvl = D_ERROR;
1498                 CDEBUG(d_lvl,
1499                        "%s: waking for gap in transno, VBR is %s (skip: "
1500                        LPD64", ql: %d, comp: %d, conn: %d, next: "LPD64
1501                        ", last_committed: "LPD64")\n",
1502                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1503                        next_transno, queue_len, completed, connected,
1504                        req_transno, obd->obd_last_committed);
1505                 obd->obd_next_recovery_transno = req_transno;
1506                 wake_up = 1;
1507         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1508                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1509                        " by fail_lock, waking up ("LPD64")\n", next_transno);
1510                 obd->obd_next_recovery_transno = req_transno;
1511                 wake_up = 1;
1512         }
1513         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1514         return wake_up;
1515 }
1516
1517 static int check_for_next_lock(struct obd_device *obd)
1518 {
1519         int wake_up = 0;
1520
1521         cfs_spin_lock(&obd->obd_recovery_task_lock);
1522         if (!cfs_list_empty(&obd->obd_lock_replay_queue)) {
1523                 CDEBUG(D_HA, "waking for next lock\n");
1524                 wake_up = 1;
1525         } else if (cfs_atomic_read(&obd->obd_lock_replay_clients) == 0) {
1526                 CDEBUG(D_HA, "waking for completed lock replay\n");
1527                 wake_up = 1;
1528         } else if (obd->obd_abort_recovery) {
1529                 CDEBUG(D_HA, "waking for aborted recovery\n");
1530                 wake_up = 1;
1531         } else if (obd->obd_recovery_expired) {
1532                 CDEBUG(D_HA, "waking for expired recovery\n");
1533                 wake_up = 1;
1534         }
1535         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1536
1537         return wake_up;
1538 }
1539
1540 /**
1541  * wait for recovery events,
1542  * check its status with help of check_routine
1543  * evict dead clients via health_check
1544  */
1545 static int target_recovery_overseer(struct obd_device *obd,
1546                                     int (*check_routine)(struct obd_device *),
1547                                     int (*health_check)(struct obd_export *))
1548 {
1549 repeat:
1550         cfs_wait_event(obd->obd_next_transno_waitq, check_routine(obd));
1551         if (obd->obd_abort_recovery) {
1552                 CWARN("recovery is aborted, evict exports in recovery\n");
1553                 /** evict exports which didn't finish recovery yet */
1554                 class_disconnect_stale_exports(obd, exp_finished);
1555                 return 1;
1556         } else if (obd->obd_recovery_expired) {
1557                 obd->obd_recovery_expired = 0;
1558                 /** If some clients died being recovered, evict them */
1559                 CDEBUG(D_WARNING,
1560                        "recovery is timed out, evict stale exports\n");
1561                 /** evict cexports with no replay in queue, they are stalled */
1562                 class_disconnect_stale_exports(obd, health_check);
1563                 /** continue with VBR */
1564                 cfs_spin_lock(&obd->obd_dev_lock);
1565                 obd->obd_version_recov = 1;
1566                 cfs_spin_unlock(&obd->obd_dev_lock);
1567                 /**
1568                  * reset timer, recovery will proceed with versions now,
1569                  * timeout is set just to handle reconnection delays
1570                  */
1571                 reset_recovery_timer(obd, RECONNECT_DELAY_MAX, 1);
1572                 /** Wait for recovery events again, after evicting bad clients */
1573                 goto repeat;
1574         }
1575         return 0;
1576 }
1577
1578 static struct ptlrpc_request *target_next_replay_req(struct obd_device *obd)
1579 {
1580         struct ptlrpc_request *req = NULL;
1581         ENTRY;
1582
1583         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1584                obd->obd_next_recovery_transno);
1585
1586         if (target_recovery_overseer(obd, check_for_next_transno,
1587                                      exp_req_replay_healthy)) {
1588                 abort_req_replay_queue(obd);
1589                 abort_lock_replay_queue(obd);
1590         }
1591
1592         cfs_spin_lock(&obd->obd_recovery_task_lock);
1593         if (!cfs_list_empty(&obd->obd_req_replay_queue)) {
1594                 req = cfs_list_entry(obd->obd_req_replay_queue.next,
1595                                      struct ptlrpc_request, rq_list);
1596                 cfs_list_del_init(&req->rq_list);
1597                 obd->obd_requests_queued_for_recovery--;
1598                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1599         } else {
1600                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1601                 LASSERT(cfs_list_empty(&obd->obd_req_replay_queue));
1602                 LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients) == 0);
1603                 /** evict exports failed VBR */
1604                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1605         }
1606         RETURN(req);
1607 }
1608
1609 static struct ptlrpc_request *target_next_replay_lock(struct obd_device *obd)
1610 {
1611         struct ptlrpc_request *req = NULL;
1612
1613         CDEBUG(D_HA, "Waiting for lock\n");
1614         if (target_recovery_overseer(obd, check_for_next_lock,
1615                                      exp_lock_replay_healthy))
1616                 abort_lock_replay_queue(obd);
1617
1618         cfs_spin_lock(&obd->obd_recovery_task_lock);
1619         if (!cfs_list_empty(&obd->obd_lock_replay_queue)) {
1620                 req = cfs_list_entry(obd->obd_lock_replay_queue.next,
1621                                      struct ptlrpc_request, rq_list);
1622                 cfs_list_del_init(&req->rq_list);
1623                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1624         } else {
1625                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1626                 LASSERT(cfs_list_empty(&obd->obd_lock_replay_queue));
1627                 LASSERT(cfs_atomic_read(&obd->obd_lock_replay_clients) == 0);
1628                 /** evict exports failed VBR */
1629                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1630         }
1631         return req;
1632 }
1633
1634 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
1635 {
1636         struct ptlrpc_request *req = NULL;
1637
1638         cfs_spin_lock(&obd->obd_recovery_task_lock);
1639         if (!cfs_list_empty(&obd->obd_final_req_queue)) {
1640                 req = cfs_list_entry(obd->obd_final_req_queue.next,
1641                                      struct ptlrpc_request, rq_list);
1642                 cfs_list_del_init(&req->rq_list);
1643                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1644                 if (req->rq_export->exp_in_recovery) {
1645                         cfs_spin_lock(&req->rq_export->exp_lock);
1646                         req->rq_export->exp_in_recovery = 0;
1647                         cfs_spin_unlock(&req->rq_export->exp_lock);
1648                 }
1649         } else {
1650                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1651         }
1652         return req;
1653 }
1654
1655 static int handle_recovery_req(struct ptlrpc_thread *thread,
1656                                struct ptlrpc_request *req,
1657                                svc_handler_t handler)
1658 {
1659         int rc;
1660         ENTRY;
1661
1662         /**
1663          * export can be evicted during recovery, no need to handle replays for
1664          * it after that, discard such request silently
1665          */
1666         if (req->rq_export->exp_disconnected)
1667                 GOTO(reqcopy_put, rc = 0);
1668
1669         rc = lu_context_init(&req->rq_recov_session, LCT_SESSION);
1670         if (rc) {
1671                 CERROR("Failure to initialize session: %d\n", rc);
1672                 GOTO(reqcopy_put, rc);
1673         }
1674
1675         req->rq_recov_session.lc_thread = thread;
1676         lu_context_enter(&req->rq_recov_session);
1677         req->rq_svc_thread = thread;
1678         req->rq_svc_thread->t_env->le_ses = &req->rq_recov_session;
1679
1680         /* thread context */
1681         lu_context_enter(&thread->t_env->le_ctx);
1682         (void)handler(req);
1683         lu_context_exit(&thread->t_env->le_ctx);
1684
1685         lu_context_exit(&req->rq_recov_session);
1686         lu_context_fini(&req->rq_recov_session);
1687         /* don't reset timer for final stage */
1688         if (!exp_finished(req->rq_export)) {
1689                 /**
1690                  * Add request timeout to the recovery time so next request from
1691                  * this client may come in recovery time
1692                  */
1693                  reset_recovery_timer(class_exp2obd(req->rq_export),
1694                                       AT_OFF ? obd_timeout :
1695                                       lustre_msg_get_timeout(req->rq_reqmsg), 1);
1696         }
1697 reqcopy_put:
1698         RETURN(rc);
1699 }
1700
1701 static int target_recovery_thread(void *arg)
1702 {
1703         struct lu_target *lut = arg;
1704         struct obd_device *obd = lut->lut_obd;
1705         struct ptlrpc_request *req;
1706         struct target_recovery_data *trd = &obd->obd_recovery_data;
1707         unsigned long delta;
1708         unsigned long flags;
1709         struct lu_env env;
1710         struct ptlrpc_thread fake_svc_thread, *thread = &fake_svc_thread;
1711         int rc = 0;
1712         ENTRY;
1713
1714         cfs_daemonize_ctxt("tgt_recov");
1715
1716         SIGNAL_MASK_LOCK(current, flags);
1717         sigfillset(&current->blocked);
1718         RECALC_SIGPENDING;
1719         SIGNAL_MASK_UNLOCK(current, flags);
1720
1721         rc = lu_context_init(&env.le_ctx, LCT_MD_THREAD);
1722         if (rc)
1723                 RETURN(rc);
1724
1725         thread->t_env = &env;
1726         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
1727         env.le_ctx.lc_thread = thread;
1728         thread->t_data = NULL;
1729
1730         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
1731                cfs_curproc_pid());
1732         trd->trd_processing_task = cfs_curproc_pid();
1733
1734         cfs_spin_lock(&obd->obd_dev_lock);
1735         obd->obd_recovering = 1;
1736         cfs_spin_unlock(&obd->obd_dev_lock);
1737         cfs_complete(&trd->trd_starting);
1738
1739         /* first of all, we have to know the first transno to replay */
1740         if (target_recovery_overseer(obd, check_for_clients,
1741                                      exp_connect_healthy)) {
1742                 abort_req_replay_queue(obd);
1743                 abort_lock_replay_queue(obd);
1744         }
1745
1746         /* next stage: replay requests */
1747         delta = jiffies;
1748         CDEBUG(D_INFO, "1: request replay stage - %d clients from t"LPU64"\n",
1749                cfs_atomic_read(&obd->obd_req_replay_clients),
1750                obd->obd_next_recovery_transno);
1751         while ((req = target_next_replay_req(obd))) {
1752                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1753                 DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s",
1754                           lustre_msg_get_transno(req->rq_reqmsg),
1755                           libcfs_nid2str(req->rq_peer.nid));
1756                 handle_recovery_req(thread, req,
1757                                     trd->trd_recovery_handler);
1758                 /**
1759                  * bz18031: increase next_recovery_transno before
1760                  * target_request_copy_put() will drop exp_rpc reference
1761                  */
1762                 cfs_spin_lock(&obd->obd_recovery_task_lock);
1763                 obd->obd_next_recovery_transno++;
1764                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1765                 target_exp_dequeue_req_replay(req);
1766                 target_request_copy_put(req);
1767                 obd->obd_replayed_requests++;
1768         }
1769
1770         /**
1771          * The second stage: replay locks
1772          */
1773         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
1774                cfs_atomic_read(&obd->obd_lock_replay_clients));
1775         while ((req = target_next_replay_lock(obd))) {
1776                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1777                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
1778                           libcfs_nid2str(req->rq_peer.nid));
1779                 handle_recovery_req(thread, req,
1780                                     trd->trd_recovery_handler);
1781                 target_request_copy_put(req);
1782                 obd->obd_replayed_locks++;
1783         }
1784
1785         /**
1786          * The third stage: reply on final pings, at this moment all clients
1787          * must have request in final queue
1788          */
1789         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
1790         /** Update server last boot epoch */
1791         lut_boot_epoch_update(lut);
1792         /* We drop recoverying flag to forward all new requests
1793          * to regular mds_handle() since now */
1794         cfs_spin_lock(&obd->obd_dev_lock);
1795         obd->obd_recovering = obd->obd_abort_recovery = 0;
1796         cfs_spin_unlock(&obd->obd_dev_lock);
1797         cfs_spin_lock(&obd->obd_recovery_task_lock);
1798         target_cancel_recovery_timer(obd);
1799         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1800         while ((req = target_next_final_ping(obd))) {
1801                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1802                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
1803                           libcfs_nid2str(req->rq_peer.nid));
1804                 handle_recovery_req(thread, req,
1805                                     trd->trd_recovery_handler);
1806                 target_request_copy_put(req);
1807         }
1808
1809         delta = (jiffies - delta) / CFS_HZ;
1810         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
1811               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
1812         if (delta > OBD_RECOVERY_TIME_SOFT) {
1813                 CWARN("too long recovery - read logs\n");
1814                 libcfs_debug_dumplog();
1815         }
1816
1817         target_finish_recovery(obd);
1818
1819         lu_context_fini(&env.le_ctx);
1820         trd->trd_processing_task = 0;
1821         cfs_complete(&trd->trd_finishing);
1822         RETURN(rc);
1823 }
1824
1825 static int target_start_recovery_thread(struct lu_target *lut,
1826                                         svc_handler_t handler)
1827 {
1828         struct obd_device *obd = lut->lut_obd;
1829         int rc = 0;
1830         struct target_recovery_data *trd = &obd->obd_recovery_data;
1831
1832         memset(trd, 0, sizeof(*trd));
1833         cfs_init_completion(&trd->trd_starting);
1834         cfs_init_completion(&trd->trd_finishing);
1835         trd->trd_recovery_handler = handler;
1836
1837         if (cfs_kernel_thread(target_recovery_thread, lut, 0) > 0) {
1838                 cfs_wait_for_completion(&trd->trd_starting);
1839                 LASSERT(obd->obd_recovering != 0);
1840         } else
1841                 rc = -ECHILD;
1842
1843         return rc;
1844 }
1845
1846 void target_stop_recovery_thread(struct obd_device *obd)
1847 {
1848         if (obd->obd_recovery_data.trd_processing_task > 0) {
1849                 struct target_recovery_data *trd = &obd->obd_recovery_data;
1850                 /** recovery can be done but postrecovery is not yet */
1851                 cfs_spin_lock(&obd->obd_dev_lock);
1852                 if (obd->obd_recovering) {
1853                         CERROR("%s: Aborting recovery\n", obd->obd_name);
1854                         obd->obd_abort_recovery = 1;
1855                         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1856                 }
1857                 cfs_spin_unlock(&obd->obd_dev_lock);
1858                 cfs_wait_for_completion(&trd->trd_finishing);
1859         }
1860 }
1861
1862 void target_recovery_fini(struct obd_device *obd)
1863 {
1864         class_disconnect_exports(obd);
1865         target_stop_recovery_thread(obd);
1866         target_cleanup_recovery(obd);
1867 }
1868 EXPORT_SYMBOL(target_recovery_fini);
1869
1870 static void target_recovery_expired(unsigned long castmeharder)
1871 {
1872         struct obd_device *obd = (struct obd_device *)castmeharder;
1873         CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
1874                " after %lds (%d clients connected)\n",
1875                obd->obd_name, cfs_atomic_read(&obd->obd_lock_replay_clients),
1876                cfs_time_current_sec()- obd->obd_recovery_start,
1877                obd->obd_connected_clients);
1878
1879         obd->obd_recovery_expired = 1;
1880         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1881 }
1882
1883 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
1884 {
1885         struct obd_device *obd = lut->lut_obd;
1886         if (obd->obd_max_recoverable_clients == 0) {
1887                 /** Update server last boot epoch */
1888                 lut_boot_epoch_update(lut);
1889                 return;
1890         }
1891
1892         CWARN("RECOVERY: service %s, %d recoverable clients, "
1893               "last_transno "LPU64"\n", obd->obd_name,
1894               obd->obd_max_recoverable_clients, obd->obd_last_committed);
1895         LASSERT(obd->obd_stopping == 0);
1896         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
1897         obd->obd_recovery_start = 0;
1898         obd->obd_recovery_end = 0;
1899
1900         /* both values can be get from mount data already */
1901         if (obd->obd_recovery_timeout == 0)
1902                 obd->obd_recovery_timeout = OBD_RECOVERY_TIME_SOFT;
1903         if (obd->obd_recovery_time_hard == 0)
1904                 obd->obd_recovery_time_hard = OBD_RECOVERY_TIME_HARD;
1905         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
1906         target_start_recovery_thread(lut, handler);
1907 }
1908 EXPORT_SYMBOL(target_recovery_init);
1909
1910 #endif
1911
1912 static int target_process_req_flags(struct obd_device *obd,
1913                                     struct ptlrpc_request *req)
1914 {
1915         struct obd_export *exp = req->rq_export;
1916         LASSERT(exp != NULL);
1917         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1918                 /* client declares he's ready to replay locks */
1919                 cfs_spin_lock(&exp->exp_lock);
1920                 if (exp->exp_req_replay_needed) {
1921                         exp->exp_req_replay_needed = 0;
1922                         cfs_spin_unlock(&exp->exp_lock);
1923
1924                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
1925                         cfs_atomic_dec(&obd->obd_req_replay_clients);
1926                 } else {
1927                         cfs_spin_unlock(&exp->exp_lock);
1928                 }
1929         }
1930         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1931                 /* client declares he's ready to complete recovery
1932                  * so, we put the request on th final queue */
1933                 cfs_spin_lock(&exp->exp_lock);
1934                 if (exp->exp_lock_replay_needed) {
1935                         exp->exp_lock_replay_needed = 0;
1936                         cfs_spin_unlock(&exp->exp_lock);
1937
1938                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
1939                         cfs_atomic_dec(&obd->obd_lock_replay_clients);
1940                 } else {
1941                         cfs_spin_unlock(&exp->exp_lock);
1942                 }
1943         }
1944         return 0;
1945 }
1946
1947 int target_queue_recovery_request(struct ptlrpc_request *req,
1948                                   struct obd_device *obd)
1949 {
1950         cfs_list_t *tmp;
1951         int inserted = 0;
1952         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1953         ENTRY;
1954
1955         if (obd->obd_recovery_data.trd_processing_task == cfs_curproc_pid()) {
1956                 /* Processing the queue right now, don't re-add. */
1957                 RETURN(1);
1958         }
1959
1960         target_process_req_flags(obd, req);
1961
1962         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1963                 /* client declares he's ready to complete recovery
1964                  * so, we put the request on th final queue */
1965                 target_request_copy_get(req);
1966                 DEBUG_REQ(D_HA, req, "queue final req");
1967                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1968                 cfs_spin_lock(&obd->obd_recovery_task_lock);
1969                 if (obd->obd_recovering) {
1970                         cfs_list_add_tail(&req->rq_list,
1971                                           &obd->obd_final_req_queue);
1972                 } else {
1973                         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1974                         target_request_copy_put(req);
1975                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
1976                 }
1977                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1978                 RETURN(0);
1979         }
1980         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1981                 /* client declares he's ready to replay locks */
1982                 target_request_copy_get(req);
1983                 DEBUG_REQ(D_HA, req, "queue lock replay req");
1984                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1985                 cfs_spin_lock(&obd->obd_recovery_task_lock);
1986                 LASSERT(obd->obd_recovering);
1987                 /* usually due to recovery abort */
1988                 if (!req->rq_export->exp_in_recovery) {
1989                         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1990                         target_request_copy_put(req);
1991                         RETURN(-ENOTCONN);
1992                 }
1993                 LASSERT(req->rq_export->exp_lock_replay_needed);
1994                 cfs_list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
1995                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1996                 RETURN(0);
1997         }
1998
1999         /* CAVEAT EMPTOR: The incoming request message has been swabbed
2000          * (i.e. buflens etc are in my own byte order), but type-dependent
2001          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
2002
2003         if (!transno) {
2004                 CFS_INIT_LIST_HEAD(&req->rq_list);
2005                 DEBUG_REQ(D_HA, req, "not queueing");
2006                 RETURN(1);
2007         }
2008
2009         /* If we're processing the queue, we want don't want to queue this
2010          * message.
2011          *
2012          * Also, if this request has a transno less than the one we're waiting
2013          * for, we should process it now.  It could (and currently always will)
2014          * be an open request for a descriptor that was opened some time ago.
2015          *
2016          * Also, a resent, replayed request that has already been
2017          * handled will pass through here and be processed immediately.
2018          */
2019         CWARN("Next recovery transno: "LPU64", current: "LPU64", replaying\n",
2020               obd->obd_next_recovery_transno, transno);
2021         cfs_spin_lock(&obd->obd_recovery_task_lock);
2022         if (transno < obd->obd_next_recovery_transno) {
2023                 /* Processing the queue right now, don't re-add. */
2024                 LASSERT(cfs_list_empty(&req->rq_list));
2025                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
2026                 RETURN(1);
2027         }
2028         cfs_spin_unlock(&obd->obd_recovery_task_lock);
2029
2030         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2031                 RETURN(0);
2032
2033         target_request_copy_get(req);
2034         if (!req->rq_export->exp_in_recovery) {
2035                 target_request_copy_put(req);
2036                 RETURN(-ENOTCONN);
2037         }
2038         LASSERT(req->rq_export->exp_req_replay_needed);
2039
2040         if (target_exp_enqueue_req_replay(req)) {
2041                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2042                 target_request_copy_put(req);
2043                 RETURN(0);
2044         }
2045
2046         /* XXX O(n^2) */
2047         cfs_spin_lock(&obd->obd_recovery_task_lock);
2048         LASSERT(obd->obd_recovering);
2049         cfs_list_for_each(tmp, &obd->obd_req_replay_queue) {
2050                 struct ptlrpc_request *reqiter =
2051                         cfs_list_entry(tmp, struct ptlrpc_request, rq_list);
2052
2053                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2054                         cfs_list_add_tail(&req->rq_list, &reqiter->rq_list);
2055                         inserted = 1;
2056                         break;
2057                 }
2058
2059                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2060                              transno)) {
2061                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2062                                   "has been claimed by another client");
2063                         cfs_spin_unlock(&obd->obd_recovery_task_lock);
2064                         target_exp_dequeue_req_replay(req);
2065                         target_request_copy_put(req);
2066                         RETURN(0);
2067                 }
2068         }
2069
2070         if (!inserted)
2071                 cfs_list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2072
2073         obd->obd_requests_queued_for_recovery++;
2074         cfs_spin_unlock(&obd->obd_recovery_task_lock);
2075         cfs_waitq_signal(&obd->obd_next_transno_waitq);
2076         RETURN(0);
2077 }
2078
2079 /**
2080  * Packs current SLV and Limit into \a req.
2081  */
2082 int target_pack_pool_reply(struct ptlrpc_request *req)
2083 {
2084         struct obd_device *obd;
2085         ENTRY;
2086
2087         /*
2088          * Check that we still have all structures alive as this may
2089          * be some late rpc in shutdown time.
2090          */
2091         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2092                      !exp_connect_lru_resize(req->rq_export))) {
2093                 lustre_msg_set_slv(req->rq_repmsg, 0);
2094                 lustre_msg_set_limit(req->rq_repmsg, 0);
2095                 RETURN(0);
2096         }
2097
2098         /*
2099          * OBD is alive here as export is alive, which we checked above.
2100          */
2101         obd = req->rq_export->exp_obd;
2102
2103         cfs_read_lock(&obd->obd_pool_lock);
2104         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2105         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2106         cfs_read_unlock(&obd->obd_pool_lock);
2107
2108         RETURN(0);
2109 }
2110
2111 int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
2112 {
2113         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2114                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2115                 return (-ECOMM);
2116         }
2117
2118         if (unlikely(rc)) {
2119                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
2120                 req->rq_status = rc;
2121                 return (ptlrpc_send_error(req, 1));
2122         } else {
2123                 DEBUG_REQ(D_NET, req, "sending reply");
2124         }
2125
2126         return (ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT));
2127 }
2128
2129 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2130 {
2131         int                        netrc;
2132         struct ptlrpc_reply_state *rs;
2133         struct obd_device         *obd;
2134         struct obd_export         *exp;
2135         struct ptlrpc_service     *svc;
2136         ENTRY;
2137
2138         if (req->rq_no_reply) {
2139                 EXIT;
2140                 return;
2141         }
2142
2143         svc = req->rq_rqbd->rqbd_service;
2144         rs = req->rq_reply_state;
2145         if (rs == NULL || !rs->rs_difficult) {
2146                 /* no notifiers */
2147                 target_send_reply_msg (req, rc, fail_id);
2148                 EXIT;
2149                 return;
2150         }
2151
2152         /* must be an export if locks saved */
2153         LASSERT (req->rq_export != NULL);
2154         /* req/reply consistent */
2155         LASSERT (rs->rs_service == svc);
2156
2157         /* "fresh" reply */
2158         LASSERT (!rs->rs_scheduled);
2159         LASSERT (!rs->rs_scheduled_ever);
2160         LASSERT (!rs->rs_handled);
2161         LASSERT (!rs->rs_on_net);
2162         LASSERT (rs->rs_export == NULL);
2163         LASSERT (cfs_list_empty(&rs->rs_obd_list));
2164         LASSERT (cfs_list_empty(&rs->rs_exp_list));
2165
2166         exp = class_export_get (req->rq_export);
2167         obd = exp->exp_obd;
2168
2169         /* disable reply scheduling while I'm setting up */
2170         rs->rs_scheduled = 1;
2171         rs->rs_on_net    = 1;
2172         rs->rs_xid       = req->rq_xid;
2173         rs->rs_transno   = req->rq_transno;
2174         rs->rs_export    = exp;
2175         rs->rs_opc       = lustre_msg_get_opc(rs->rs_msg);
2176
2177         cfs_spin_lock(&exp->exp_uncommitted_replies_lock);
2178         CDEBUG(D_NET, "rs transno = "LPU64", last committed = "LPU64"\n",
2179                rs->rs_transno, exp->exp_last_committed);
2180         if (rs->rs_transno > exp->exp_last_committed) {
2181                 /* not committed already */
2182                 cfs_list_add_tail(&rs->rs_obd_list,
2183                                   &exp->exp_uncommitted_replies);
2184         }
2185         cfs_spin_unlock (&exp->exp_uncommitted_replies_lock);
2186
2187         cfs_spin_lock(&exp->exp_lock);
2188         cfs_list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
2189         cfs_spin_unlock(&exp->exp_lock);
2190
2191         netrc = target_send_reply_msg (req, rc, fail_id);
2192
2193         cfs_spin_lock(&svc->srv_rs_lock);
2194
2195         cfs_atomic_inc(&svc->srv_n_difficult_replies);
2196
2197         if (netrc != 0) {
2198                 /* error sending: reply is off the net.  Also we need +1
2199                  * reply ref until ptlrpc_handle_rs() is done
2200                  * with the reply state (if the send was successful, there
2201                  * would have been +1 ref for the net, which
2202                  * reply_out_callback leaves alone) */
2203                 rs->rs_on_net = 0;
2204                 ptlrpc_rs_addref(rs);
2205         }
2206
2207         cfs_spin_lock(&rs->rs_lock);
2208         if (rs->rs_transno <= exp->exp_last_committed ||
2209             (!rs->rs_on_net && !rs->rs_no_ack) ||
2210              cfs_list_empty(&rs->rs_exp_list) ||     /* completed already */
2211              cfs_list_empty(&rs->rs_obd_list)) {
2212                 CDEBUG(D_HA, "Schedule reply immediately\n");
2213                 ptlrpc_dispatch_difficult_reply(rs);
2214         } else {
2215                 cfs_list_add (&rs->rs_list, &svc->srv_active_replies);
2216                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
2217         }
2218         cfs_spin_unlock(&rs->rs_lock);
2219         cfs_spin_unlock(&svc->srv_rs_lock);
2220         EXIT;
2221 }
2222
2223 int target_handle_ping(struct ptlrpc_request *req)
2224 {
2225         obd_ping(req->rq_export);
2226         return req_capsule_server_pack(&req->rq_pill);
2227 }
2228
2229 void target_committed_to_req(struct ptlrpc_request *req)
2230 {
2231         struct obd_export *exp = req->rq_export;
2232
2233         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2234                 lustre_msg_set_last_committed(req->rq_repmsg,
2235                                               exp->exp_last_committed);
2236         else
2237                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2238                           "%d)", exp->exp_obd->obd_no_transno,
2239                           req->rq_repmsg == NULL);
2240
2241         CDEBUG(D_INFO, "last_committed "LPU64", transno "LPU64", xid "LPU64"\n",
2242                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2243 }
2244 EXPORT_SYMBOL(target_committed_to_req);
2245
2246 int target_handle_qc_callback(struct ptlrpc_request *req)
2247 {
2248         struct obd_quotactl *oqctl;
2249         struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
2250
2251         oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2252         if (oqctl == NULL) {
2253                 CERROR("Can't unpack obd_quotactl\n");
2254                 RETURN(-EPROTO);
2255         }
2256
2257         cli->cl_qchk_stat = oqctl->qc_stat;
2258
2259         return 0;
2260 }
2261
2262 #ifdef HAVE_QUOTA_SUPPORT
2263 int target_handle_dqacq_callback(struct ptlrpc_request *req)
2264 {
2265 #ifdef __KERNEL__
2266         struct obd_device *obd = req->rq_export->exp_obd;
2267         struct obd_device *master_obd = NULL, *lov_obd = NULL;
2268         struct obd_device_target *obt;
2269         struct lustre_quota_ctxt *qctxt;
2270         struct qunit_data *qdata = NULL;
2271         int rc = 0;
2272         ENTRY;
2273
2274         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_DROP_QUOTA_REQ))
2275                 RETURN(rc);
2276
2277         rc = req_capsule_server_pack(&req->rq_pill);
2278         if (rc) {
2279                 CERROR("packing reply failed!: rc = %d\n", rc);
2280                 RETURN(rc);
2281         }
2282
2283         LASSERT(req->rq_export);
2284
2285         qdata = quota_get_qdata(req, QUOTA_REQUEST, QUOTA_EXPORT);
2286         if (IS_ERR(qdata)) {
2287                 rc = PTR_ERR(qdata);
2288                 CDEBUG(D_ERROR, "Can't unpack qunit_data(rc: %d)\n", rc);
2289                 req->rq_status = rc;
2290                 GOTO(out, rc);
2291         }
2292
2293         /* we use the observer */
2294         if (obd_pin_observer(obd, &lov_obd) ||
2295             obd_pin_observer(lov_obd, &master_obd)) {
2296                 CERROR("Can't find the observer, it is recovering\n");
2297                 req->rq_status = -EAGAIN;
2298                 GOTO(out, rc);
2299         }
2300
2301         obt = &master_obd->u.obt;
2302         qctxt = &obt->obt_qctxt;
2303
2304         if (!qctxt->lqc_setup || !qctxt->lqc_valid) {
2305                 /* quota_type has not been processed yet, return EAGAIN
2306                  * until we know whether or not quotas are supposed to
2307                  * be enabled */
2308                 CDEBUG(D_QUOTA, "quota_type not processed yet, return "
2309                        "-EAGAIN\n");
2310                 req->rq_status = -EAGAIN;
2311                 GOTO(out, rc);
2312         }
2313
2314         cfs_down_read(&obt->obt_rwsem);
2315         if (qctxt->lqc_lqs_hash == NULL) {
2316                 cfs_up_read(&obt->obt_rwsem);
2317                 /* quota_type has not been processed yet, return EAGAIN
2318                  * until we know whether or not quotas are supposed to
2319                  * be enabled */
2320                 CDEBUG(D_QUOTA, "quota_ctxt is not ready yet, return "
2321                        "-EAGAIN\n");
2322                 req->rq_status = -EAGAIN;
2323                 GOTO(out, rc);
2324         }
2325
2326         LASSERT(qctxt->lqc_handler);
2327         rc = qctxt->lqc_handler(master_obd, qdata,
2328                                 lustre_msg_get_opc(req->rq_reqmsg));
2329         cfs_up_read(&obt->obt_rwsem);
2330         if (rc && rc != -EDQUOT)
2331                 CDEBUG(rc == -EBUSY  ? D_QUOTA : D_ERROR,
2332                        "dqacq/dqrel failed! (rc:%d)\n", rc);
2333         req->rq_status = rc;
2334
2335         rc = quota_copy_qdata(req, qdata, QUOTA_REPLY, QUOTA_EXPORT);
2336         if (rc < 0) {
2337                 CERROR("Can't pack qunit_data(rc: %d)\n", rc);
2338                 GOTO(out, rc);
2339         }
2340
2341         /* Block the quota req. b=14840 */
2342         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_BLOCK_QUOTA_REQ, obd_timeout);
2343         EXIT;
2344
2345 out:
2346         if (master_obd)
2347                 obd_unpin_observer(lov_obd);
2348         if (lov_obd)
2349                 obd_unpin_observer(obd);
2350
2351         rc = ptlrpc_reply(req);
2352         return rc;
2353 #else
2354         return 0;
2355 #endif /* !__KERNEL__ */
2356 }
2357 #endif /* HAVE_QUOTA_SUPPORT */
2358
2359 ldlm_mode_t lck_compat_array[] = {
2360         [LCK_EX] LCK_COMPAT_EX,
2361         [LCK_PW] LCK_COMPAT_PW,
2362         [LCK_PR] LCK_COMPAT_PR,
2363         [LCK_CW] LCK_COMPAT_CW,
2364         [LCK_CR] LCK_COMPAT_CR,
2365         [LCK_NL] LCK_COMPAT_NL,
2366         [LCK_GROUP] LCK_COMPAT_GROUP,
2367         [LCK_COS] LCK_COMPAT_COS,
2368 };
2369
2370 /**
2371  * Rather arbitrary mapping from LDLM error codes to errno values. This should
2372  * not escape to the user level.
2373  */
2374 int ldlm_error2errno(ldlm_error_t error)
2375 {
2376         int result;
2377
2378         switch (error) {
2379         case ELDLM_OK:
2380                 result = 0;
2381                 break;
2382         case ELDLM_LOCK_CHANGED:
2383                 result = -ESTALE;
2384                 break;
2385         case ELDLM_LOCK_ABORTED:
2386                 result = -ENAVAIL;
2387                 break;
2388         case ELDLM_LOCK_REPLACED:
2389                 result = -ESRCH;
2390                 break;
2391         case ELDLM_NO_LOCK_DATA:
2392                 result = -ENOENT;
2393                 break;
2394         case ELDLM_NAMESPACE_EXISTS:
2395                 result = -EEXIST;
2396                 break;
2397         case ELDLM_BAD_NAMESPACE:
2398                 result = -EBADF;
2399                 break;
2400         default:
2401                 if (((int)error) < 0)  /* cast to signed type */
2402                         result = error; /* as ldlm_error_t can be unsigned */
2403                 else {
2404                         CERROR("Invalid DLM result code: %d\n", error);
2405                         result = -EPROTO;
2406                 }
2407         }
2408         return result;
2409 }
2410 EXPORT_SYMBOL(ldlm_error2errno);
2411
2412 /**
2413  * Dual to ldlm_error2errno(): maps errno values back to ldlm_error_t.
2414  */
2415 ldlm_error_t ldlm_errno2error(int err_no)
2416 {
2417         int error;
2418
2419         switch (err_no) {
2420         case 0:
2421                 error = ELDLM_OK;
2422                 break;
2423         case -ESTALE:
2424                 error = ELDLM_LOCK_CHANGED;
2425                 break;
2426         case -ENAVAIL:
2427                 error = ELDLM_LOCK_ABORTED;
2428                 break;
2429         case -ESRCH:
2430                 error = ELDLM_LOCK_REPLACED;
2431                 break;
2432         case -ENOENT:
2433                 error = ELDLM_NO_LOCK_DATA;
2434                 break;
2435         case -EEXIST:
2436                 error = ELDLM_NAMESPACE_EXISTS;
2437                 break;
2438         case -EBADF:
2439                 error = ELDLM_BAD_NAMESPACE;
2440                 break;
2441         default:
2442                 error = err_no;
2443         }
2444         return error;
2445 }
2446 EXPORT_SYMBOL(ldlm_errno2error);
2447
2448 #if LUSTRE_TRACKS_LOCK_EXP_REFS
2449 void ldlm_dump_export_locks(struct obd_export *exp)
2450 {
2451         cfs_spin_lock(&exp->exp_locks_list_guard);
2452         if (!cfs_list_empty(&exp->exp_locks_list)) {
2453             struct ldlm_lock *lock;
2454
2455             CERROR("dumping locks for export %p,"
2456                    "ignore if the unmount doesn't hang\n", exp);
2457             cfs_list_for_each_entry(lock, &exp->exp_locks_list, l_exp_refs_link)
2458                 ldlm_lock_dump(D_ERROR, lock, 0);
2459         }
2460         cfs_spin_unlock(&exp->exp_locks_list_guard);
2461 }
2462 #endif