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  2008 Sun Microsystems, Inc. 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         int rc;
 218         ENTRY;
 219
 220         /* In a more perfect world, we would hang a ptlrpc_client off of
 221          * obd_type and just use the values from there. */
 222         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 223                 rq_portal = OST_REQUEST_PORTAL;
 224                 rp_portal = OSC_REPLY_PORTAL;
 225                 connect_op = OST_CONNECT;
 226                 cli->cl_sp_me = LUSTRE_SP_CLI;
 227                 cli->cl_sp_to = LUSTRE_SP_OST;
 228         } else if (!strcmp(name, LUSTRE_MDC_NAME)) {
 229                 rq_portal = MDS_REQUEST_PORTAL;
 230                 rp_portal = MDC_REPLY_PORTAL;
 231                 connect_op = MDS_CONNECT;
 232                 cli->cl_sp_me = LUSTRE_SP_CLI;
 233                 cli->cl_sp_to = LUSTRE_SP_MDT;
 234         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 235                 rq_portal = MGS_REQUEST_PORTAL;
 236                 rp_portal = MGC_REPLY_PORTAL;
 237                 connect_op = MGS_CONNECT;
 238                 cli->cl_sp_me = LUSTRE_SP_MGC;
 239                 cli->cl_sp_to = LUSTRE_SP_MGS;
 240                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 241         } else {
 242                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 243                        name);
 244                 RETURN(-EINVAL);
 245         }
 246
 247         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 248                 CERROR("requires a TARGET UUID\n");
 249                 RETURN(-EINVAL);
 250         }
 251
 252         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 253                 CERROR("client UUID must be less than 38 characters\n");
 254                 RETURN(-EINVAL);
 255         }
 256
 257         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 258                 CERROR("setup requires a SERVER UUID\n");
 259                 RETURN(-EINVAL);
 260         }
 261
 262         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 263                 CERROR("target UUID must be less than 38 characters\n");
 264                 RETURN(-EINVAL);
 265         }
 266
 267         cfs_init_rwsem(&cli->cl_sem);
 268         cfs_sema_init(&cli->cl_mgc_sem, 1);
 269         cli->cl_conn_count = 0;
 270         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 271                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 272                      sizeof(server_uuid)));
 273
 274         cli->cl_dirty = 0;
 275         cli->cl_avail_grant = 0;
 276         /* FIXME: should limit this for the sum of all cl_dirty_max */
 277         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 278         if (cli->cl_dirty_max >> CFS_PAGE_SHIFT > cfs_num_physpages / 8)
 279                 cli->cl_dirty_max = cfs_num_physpages << (CFS_PAGE_SHIFT - 3);
 280         CFS_INIT_LIST_HEAD(&cli->cl_cache_waiters);
 281         CFS_INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 282         CFS_INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 283         CFS_INIT_LIST_HEAD(&cli->cl_loi_write_list);
 284         CFS_INIT_LIST_HEAD(&cli->cl_loi_read_list);
 285         client_obd_list_lock_init(&cli->cl_loi_list_lock);
 286         cli->cl_r_in_flight = 0;
 287         cli->cl_w_in_flight = 0;
 288
 289         cfs_spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 290         cfs_spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 291         cfs_spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 292         cfs_spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 293         cfs_spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 294         cfs_spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 295         cfs_waitq_init(&cli->cl_destroy_waitq);
 296         cfs_atomic_set(&cli->cl_destroy_in_flight, 0);
 297 #ifdef ENABLE_CHECKSUM
 298         /* Turn on checksumming by default. */
 299         cli->cl_checksum = 1;
 300         /*
 301          * The supported checksum types will be worked out at connect time
 302          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 303          * through procfs.
 304          */
 305         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 306 #endif
 307         cfs_atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 308
 309         /* This value may be changed at connect time in
 310            ptlrpc_connect_interpret. */
 311         cli->cl_max_pages_per_rpc = min((int)PTLRPC_MAX_BRW_PAGES,
 312                                         (int)(1024 * 1024 >> CFS_PAGE_SHIFT));
 313
 314         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 315                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
 316         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 128 /* MB */) {
 317                 cli->cl_max_rpcs_in_flight = 2;
 318         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 256 /* MB */) {
 319                 cli->cl_max_rpcs_in_flight = 3;
 320         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 512 /* MB */) {
 321                 cli->cl_max_rpcs_in_flight = 4;
 322         } else {
 323                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 324         }
 325
 326         rc = ldlm_get_ref();
 327         if (rc) {
 328                 CERROR("ldlm_get_ref failed: %d\n", rc);
 329                 GOTO(err, rc);
 330         }
 331
 332         ptlrpc_init_client(rq_portal, rp_portal, name,
 333                            &obddev->obd_ldlm_client);
 334
 335         imp = class_new_import(obddev);
 336         if (imp == NULL)
 337                 GOTO(err_ldlm, rc = -ENOENT);
 338         imp->imp_client = &obddev->obd_ldlm_client;
 339         imp->imp_connect_op = connect_op;
 340         imp->imp_initial_recov = 1;
 341         imp->imp_initial_recov_bk = 0;
 342         CFS_INIT_LIST_HEAD(&imp->imp_pinger_chain);
 343         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 344                LUSTRE_CFG_BUFLEN(lcfg, 1));
 345         class_import_put(imp);
 346
 347         rc = client_import_add_conn(imp, &server_uuid, 1);
 348         if (rc) {
 349                 CERROR("can't add initial connection\n");
 350                 GOTO(err_import, rc);
 351         }
 352
 353         cli->cl_import = imp;
 354         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 355         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 356         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 357
 358         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 359                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 360                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 361                                name, obddev->obd_name,
 362                                cli->cl_target_uuid.uuid);
 363                         cfs_spin_lock(&imp->imp_lock);
 364                         imp->imp_deactive = 1;
 365                         cfs_spin_unlock(&imp->imp_lock);
 366                 }
 367         }
 368
 369         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 370                                                    LDLM_NAMESPACE_CLIENT,
 371                                                    LDLM_NAMESPACE_GREEDY);
 372         if (obddev->obd_namespace == NULL) {
 373                 CERROR("Unable to create client namespace - %s\n",
 374                        obddev->obd_name);
 375                 GOTO(err_import, rc = -ENOMEM);
 376         }
 377
 378         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 379
 380         RETURN(rc);
 381
 382 err_import:
 383         class_destroy_import(imp);
 384 err_ldlm:
 385         ldlm_put_ref();
 386 err:
 387         RETURN(rc);
 388
 389 }
 390
 391 int client_obd_cleanup(struct obd_device *obddev)
 392 {
 393         ENTRY;
 394
 395         ldlm_namespace_free_post(obddev->obd_namespace);
 396         obddev->obd_namespace = NULL;
 397
 398         ldlm_put_ref();
 399         RETURN(0);
 400 }
 401
 402 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 403 int client_connect_import(const struct lu_env *env,
 404                           struct obd_export **exp,
 405                           struct obd_device *obd, struct obd_uuid *cluuid,
 406                           struct obd_connect_data *data, void *localdata)
 407 {
 408         struct client_obd *cli = &obd->u.cli;
 409         struct obd_import *imp = cli->cl_import;
 410         struct obd_connect_data *ocd;
 411         struct lustre_handle conn = { 0 };
 412         int rc;
 413         ENTRY;
 414
 415         *exp = NULL;
 416         cfs_down_write(&cli->cl_sem);
 417         if (cli->cl_conn_count > 0 )
 418                 GOTO(out_sem, rc = -EALREADY);
 419
 420         rc = class_connect(&conn, obd, cluuid);
 421         if (rc)
 422                 GOTO(out_sem, rc);
 423
 424         cli->cl_conn_count++;
 425         *exp = class_conn2export(&conn);
 426
 427         LASSERT(obd->obd_namespace);
 428
 429         imp->imp_dlm_handle = conn;
 430         rc = ptlrpc_init_import(imp);
 431         if (rc != 0)
 432                 GOTO(out_ldlm, rc);
 433
 434         ocd = &imp->imp_connect_data;
 435         if (data) {
 436                 *ocd = *data;
 437                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 438         }
 439
 440         rc = ptlrpc_connect_import(imp, NULL);
 441         if (rc != 0) {
 442                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 443                 GOTO(out_ldlm, rc);
 444         }
 445         LASSERT((*exp)->exp_connection);
 446
 447         if (data) {
 448                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 449                          ocd->ocd_connect_flags, "old "LPX64", new "LPX64"\n",
 450                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 451                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 452         }
 453
 454         ptlrpc_pinger_add_import(imp);
 455
 456         EXIT;
 457
 458         if (rc) {
 459 out_ldlm:
 460                 cli->cl_conn_count--;
 461                 class_disconnect(*exp);
 462                 *exp = NULL;
 463         }
 464 out_sem:
 465         cfs_up_write(&cli->cl_sem);
 466
 467         return rc;
 468 }
 469
 470 int client_disconnect_export(struct obd_export *exp)
 471 {
 472         struct obd_device *obd = class_exp2obd(exp);
 473         struct client_obd *cli;
 474         struct obd_import *imp;
 475         int rc = 0, err;
 476         ENTRY;
 477
 478         if (!obd) {
 479                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 480                        exp, exp ? exp->exp_handle.h_cookie : -1);
 481                 RETURN(-EINVAL);
 482         }
 483
 484         cli = &obd->u.cli;
 485         imp = cli->cl_import;
 486
 487         cfs_down_write(&cli->cl_sem);
 488         CDEBUG(D_INFO, "disconnect %s - %d\n", obd->obd_name,
 489                cli->cl_conn_count);
 490
 491         if (!cli->cl_conn_count) {
 492                 CERROR("disconnecting disconnected device (%s)\n",
 493                        obd->obd_name);
 494                 GOTO(out_disconnect, rc = -EINVAL);
 495         }
 496
 497         cli->cl_conn_count--;
 498         if (cli->cl_conn_count)
 499                 GOTO(out_disconnect, rc = 0);
 500
 501         /* Mark import deactivated now, so we don't try to reconnect if any
 502          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
 503          * fully deactivate the import, or that would drop all requests. */
 504         cfs_spin_lock(&imp->imp_lock);
 505         imp->imp_deactive = 1;
 506         cfs_spin_unlock(&imp->imp_lock);
 507
 508         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 509          * delete it regardless.  (It's safe to delete an import that was
 510          * never added.) */
 511         (void)ptlrpc_pinger_del_import(imp);
 512
 513         if (obd->obd_namespace != NULL) {
 514                 /* obd_force == local only */
 515                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 516                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 517                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 518         }
 519
 520         /*
 521          * there's no need to hold sem during disconnecting an import,
 522          * and actually it may cause deadlock in gss.
 523          */
 524         cfs_up_write(&cli->cl_sem);
 525         rc = ptlrpc_disconnect_import(imp, 0);
 526         cfs_down_write(&cli->cl_sem);
 527
 528         ptlrpc_invalidate_import(imp);
 529
 530         if (imp->imp_rq_pool) {
 531                 ptlrpc_free_rq_pool(imp->imp_rq_pool);
 532                 imp->imp_rq_pool = NULL;
 533         }
 534         client_destroy_import(imp);
 535         cli->cl_import = NULL;
 536
 537         EXIT;
 538
 539  out_disconnect:
 540         /* use server style - class_disconnect should be always called for
 541          * o_disconnect */
 542         err = class_disconnect(exp);
 543         if (!rc && err)
 544                 rc = err;
 545
 546         cfs_up_write(&cli->cl_sem);
 547
 548         RETURN(rc);
 549 }
 550
 551 int server_disconnect_export(struct obd_export *exp)
 552 {
 553         int rc;
 554         ENTRY;
 555
 556         /* Disconnect early so that clients can't keep using export */
 557         rc = class_disconnect(exp);
 558         /* close import for avoid sending any requests */
 559         if (exp->exp_imp_reverse)
 560                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 561
 562         if (exp->exp_obd->obd_namespace != NULL)
 563                 ldlm_cancel_locks_for_export(exp);
 564
 565         /* complete all outstanding replies */
 566         cfs_spin_lock(&exp->exp_lock);
 567         while (!cfs_list_empty(&exp->exp_outstanding_replies)) {
 568                 struct ptlrpc_reply_state *rs =
 569                         cfs_list_entry(exp->exp_outstanding_replies.next,
 570                                        struct ptlrpc_reply_state, rs_exp_list);
 571                 struct ptlrpc_service *svc = rs->rs_service;
 572
 573                 cfs_spin_lock(&svc->srv_lock);
 574                 cfs_list_del_init(&rs->rs_exp_list);
 575                 cfs_spin_lock(&rs->rs_lock);
 576                 ptlrpc_schedule_difficult_reply(rs);
 577                 cfs_spin_unlock(&rs->rs_lock);
 578                 cfs_spin_unlock(&svc->srv_lock);
 579         }
 580         cfs_spin_unlock(&exp->exp_lock);
 581
 582         /* release nid stat refererence */
 583         lprocfs_exp_cleanup(exp);
 584
 585         RETURN(rc);
 586 }
 587
 588 /* --------------------------------------------------------------------------
 589  * from old lib/target.c
 590  * -------------------------------------------------------------------------- */
 591
 592 static int target_handle_reconnect(struct lustre_handle *conn,
 593                                    struct obd_export *exp,
 594                                    struct obd_uuid *cluuid)
 595 {
 596         ENTRY;
 597         if (exp->exp_connection && exp->exp_imp_reverse) {
 598                 struct lustre_handle *hdl;
 599                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 600                 /* Might be a re-connect after a partition. */
 601                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 602                         CWARN("%s: %s reconnecting\n", exp->exp_obd->obd_name,
 603                               cluuid->uuid);
 604                         conn->cookie = exp->exp_handle.h_cookie;
 605                         /* target_handle_connect() treats EALREADY and
 606                          * -EALREADY differently.  EALREADY means we are
 607                          * doing a valid reconnect from the same client. */
 608                         RETURN(EALREADY);
 609                 } else {
 610                         CERROR("%s reconnecting from %s, "
 611                                "handle mismatch (ours "LPX64", theirs "
 612                                LPX64")\n", cluuid->uuid,
 613                                exp->exp_connection->c_remote_uuid.uuid,
 614                                hdl->cookie, conn->cookie);
 615                         memset(conn, 0, sizeof *conn);
 616                         /* target_handle_connect() treats EALREADY and
 617                          * -EALREADY differently.  -EALREADY is an error
 618                          * (same UUID, different handle). */
 619                         RETURN(-EALREADY);
 620                 }
 621         }
 622
 623         conn->cookie = exp->exp_handle.h_cookie;
 624         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
 625                cluuid->uuid, exp, conn->cookie);
 626         RETURN(0);
 627 }
 628
 629 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
 630                           int error)
 631 {
 632         struct obd_export *exp = cb_data;
 633
 634         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 635                obd->obd_name, exp->exp_client_uuid.uuid);
 636
 637         cfs_spin_lock(&exp->exp_lock);
 638         exp->exp_need_sync = 0;
 639         cfs_spin_unlock(&exp->exp_lock);
 640         class_export_cb_put(exp);
 641 }
 642 EXPORT_SYMBOL(target_client_add_cb);
 643
 644 static void
 645 target_start_and_reset_recovery_timer(struct obd_device *obd,
 646                                       struct ptlrpc_request *req,
 647                                       int new_client);
 648
 649 int target_handle_connect(struct ptlrpc_request *req)
 650 {
 651         struct obd_device *target, *targref = NULL;
 652         struct obd_export *export = NULL;
 653         struct obd_import *revimp;
 654         struct lustre_handle conn;
 655         struct lustre_handle *tmp;
 656         struct obd_uuid tgtuuid;
 657         struct obd_uuid cluuid;
 658         struct obd_uuid remote_uuid;
 659         char *str;
 660         int rc = 0;
 661         int mds_conn = 0;
 662         struct obd_connect_data *data, *tmpdata;
 663         lnet_nid_t *client_nid = NULL;
 664         ENTRY;
 665
 666         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 667
 668         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 669         if (str == NULL) {
 670                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 671                 GOTO(out, rc = -EINVAL);
 672         }
 673
 674         obd_str2uuid(&tgtuuid, str);
 675         target = class_uuid2obd(&tgtuuid);
 676         if (!target)
 677                 target = class_name2obd(str);
 678
 679         if (!target || target->obd_stopping || !target->obd_set_up) {
 680                 LCONSOLE_ERROR_MSG(0x137, "UUID '%s' is not available "
 681                                    " for connect (%s)\n", str,
 682                                    !target ? "no target" :
 683                                    (target->obd_stopping ? "stopping" :
 684                                    "not set up"));
 685                 GOTO(out, rc = -ENODEV);
 686         }
 687
 688         if (target->obd_no_conn) {
 689                 LCONSOLE_WARN("%s: temporarily refusing client connection "
 690                               "from %s\n", target->obd_name,
 691                               libcfs_nid2str(req->rq_peer.nid));
 692                 GOTO(out, rc = -EAGAIN);
 693         }
 694
 695         /* Make sure the target isn't cleaned up while we're here. Yes,
 696            there's still a race between the above check and our incref here.
 697            Really, class_uuid2obd should take the ref. */
 698         targref = class_incref(target, __FUNCTION__, cfs_current());
 699
 700
 701         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
 702         if (str == NULL) {
 703                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
 704                 GOTO(out, rc = -EINVAL);
 705         }
 706
 707         obd_str2uuid(&cluuid, str);
 708
 709         /* XXX extract a nettype and format accordingly */
 710         switch (sizeof(lnet_nid_t)) {
 711                 /* NB the casts only avoid compiler warnings */
 712         case 8:
 713                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 714                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
 715                 break;
 716         case 4:
 717                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 718                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
 719                 break;
 720         default:
 721                 LBUG();
 722         }
 723
 724         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 725         if (tmp == NULL)
 726                 GOTO(out, rc = -EPROTO);
 727
 728         conn = *tmp;
 729
 730         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 731         if (!data)
 732                 GOTO(out, rc = -EPROTO);
 733
 734         rc = req_capsule_server_pack(&req->rq_pill);
 735         if (rc)
 736                 GOTO(out, rc);
 737
 738         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 739                 if (!data) {
 740                         DEBUG_REQ(D_WARNING, req, "Refusing old (unversioned) "
 741                                   "libclient connection attempt");
 742                         GOTO(out, rc = -EPROTO);
 743                 } else if (data->ocd_version < LUSTRE_VERSION_CODE -
 744                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
 745                            data->ocd_version > LUSTRE_VERSION_CODE +
 746                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
 747                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
 748                                   "libclient connection attempt",
 749                                   data->ocd_version < LUSTRE_VERSION_CODE ?
 750                                   "old" : "new",
 751                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
 752                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
 753                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
 754                                   OBD_OCD_VERSION_FIX(data->ocd_version));
 755                         data = req_capsule_server_sized_get(&req->rq_pill,
 756                                                         &RMF_CONNECT_DATA,
 757                                     offsetof(typeof(*data), ocd_version) +
 758                                              sizeof(data->ocd_version));
 759                         if (data) {
 760                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
 761                                 data->ocd_version = LUSTRE_VERSION_CODE;
 762                         }
 763                         GOTO(out, rc = -EPROTO);
 764                 }
 765         }
 766
 767         if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) &&
 768             (data->ocd_connect_flags & OBD_CONNECT_MDS))
 769                 mds_conn = 1;
 770
 771         /* lctl gets a backstage, all-access pass. */
 772         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 773                 goto dont_check_exports;
 774
 775         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
 776         if (!export)
 777                 goto no_export;
 778
 779         /* we've found an export in the hash */
 780         if (export->exp_connecting) { /* bug 9635, et. al. */
 781                 CWARN("%s: exp %p already connecting\n",
 782                       export->exp_obd->obd_name, export);
 783                 class_export_put(export);
 784                 export = NULL;
 785                 rc = -EALREADY;
 786         } else if (mds_conn && export->exp_connection) {
 787                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid)
 788                         /* mds reconnected after failover */
 789                         CWARN("%s: received MDS connection from NID %s,"
 790                               " removing former export from NID %s\n",
 791                             target->obd_name, libcfs_nid2str(req->rq_peer.nid),
 792                             libcfs_nid2str(export->exp_connection->c_peer.nid));
 793                 else
 794                         /* new mds connection from the same nid */
 795                         CWARN("%s: received new MDS connection from NID %s,"
 796                               " removing former export from same NID\n",
 797                             target->obd_name, libcfs_nid2str(req->rq_peer.nid));
 798                 class_fail_export(export);
 799                 class_export_put(export);
 800                 export = NULL;
 801                 rc = 0;
 802         } else if (export->exp_connection != NULL &&
 803                    req->rq_peer.nid != export->exp_connection->c_peer.nid &&
 804                    (lustre_msg_get_op_flags(req->rq_reqmsg) &
 805                     MSG_CONNECT_INITIAL)) {
 806                 /* in mds failover we have static uuid but nid can be
 807                  * changed*/
 808                 CWARN("%s: cookie %s seen on new NID %s when "
 809                       "existing NID %s is already connected\n",
 810                       target->obd_name, cluuid.uuid,
 811                       libcfs_nid2str(req->rq_peer.nid),
 812                       libcfs_nid2str(export->exp_connection->c_peer.nid));
 813                 rc = -EALREADY;
 814                 class_export_put(export);
 815                 export = NULL;
 816         } else {
 817                 cfs_spin_lock(&export->exp_lock);
 818                 export->exp_connecting = 1;
 819                 cfs_spin_unlock(&export->exp_lock);
 820                 class_export_put(export);
 821                 LASSERT(export->exp_obd == target);
 822
 823                 rc = target_handle_reconnect(&conn, export, &cluuid);
 824         }
 825
 826         /* If we found an export, we already unlocked. */
 827         if (!export) {
 828 no_export:
 829                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
 830         } else if (req->rq_export == NULL &&
 831                    cfs_atomic_read(&export->exp_rpc_count) > 0) {
 832                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
 833                       target->obd_name, cluuid.uuid,
 834                       libcfs_nid2str(req->rq_peer.nid),
 835                       export, cfs_atomic_read(&export->exp_refcount));
 836                 GOTO(out, rc = -EBUSY);
 837         } else if (req->rq_export != NULL &&
 838                    (cfs_atomic_read(&export->exp_rpc_count) > 1)) {
 839                 /* the current connect rpc has increased exp_rpc_count */
 840                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
 841                       target->obd_name, cluuid.uuid,
 842                       libcfs_nid2str(req->rq_peer.nid),
 843                       export, cfs_atomic_read(&export->exp_rpc_count) - 1);
 844                 cfs_spin_lock(&export->exp_lock);
 845                 if (req->rq_export->exp_conn_cnt <
 846                     lustre_msg_get_conn_cnt(req->rq_reqmsg))
 847                         /* try to abort active requests */
 848                         req->rq_export->exp_abort_active_req = 1;
 849                 cfs_spin_unlock(&export->exp_lock);
 850                 GOTO(out, rc = -EBUSY);
 851         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
 852                 CERROR("%s: NID %s (%s) reconnected with 1 conn_cnt; "
 853                        "cookies not random?\n", target->obd_name,
 854                        libcfs_nid2str(req->rq_peer.nid), cluuid.uuid);
 855                 GOTO(out, rc = -EALREADY);
 856         } else {
 857                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
 858         }
 859
 860         if (rc < 0) {
 861                 GOTO(out, rc);
 862         }
 863
 864         CWARN("%s: connection from %s@%s %st"LPU64" exp %p cur %ld last %ld\n",
 865                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 866               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
 867               export, (long)cfs_time_current_sec(),
 868               export ? (long)export->exp_last_request_time : 0);
 869
 870         /* Tell the client if we're in recovery. */
 871         if (target->obd_recovering) {
 872                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 873                 /* If this is the first time a client connects,
 874                    reset the recovery timer */
 875                 if (rc == 0)
 876                         target_start_and_reset_recovery_timer(target, req,
 877                                                               !export);
 878         }
 879
 880         /* We want to handle EALREADY but *not* -EALREADY from
 881          * target_handle_reconnect(), return reconnection state in a flag */
 882         if (rc == EALREADY) {
 883                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 884                 rc = 0;
 885         } else {
 886                 LASSERT(rc == 0);
 887         }
 888
 889         /* Tell the client if we support replayable requests */
 890         if (target->obd_replayable)
 891                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 892         client_nid = &req->rq_peer.nid;
 893
 894         if (export == NULL) {
 895                 if (target->obd_recovering) {
 896                         cfs_time_t t;
 897
 898                         t = cfs_timer_deadline(&target->obd_recovery_timer);
 899                         t = cfs_time_sub(t, cfs_time_current());
 900                         CERROR("%s: denying connection for new client %s (%s): "
 901                                "%d clients in recovery for "CFS_TIME_T"s\n",
 902                                target->obd_name,
 903                                libcfs_nid2str(req->rq_peer.nid), cluuid.uuid,
 904                                cfs_atomic_read(&target-> \
 905                                                obd_lock_replay_clients),
 906                                cfs_duration_sec(t));
 907                         rc = -EBUSY;
 908                 } else {
 909 dont_check_exports:
 910                         rc = obd_connect(req->rq_svc_thread->t_env,
 911                                          &export, target, &cluuid, data,
 912                                          client_nid);
 913                         if (rc == 0)
 914                                 conn.cookie = export->exp_handle.h_cookie;
 915                 }
 916         } else {
 917                 rc = obd_reconnect(req->rq_svc_thread->t_env,
 918                                    export, target, &cluuid, data, client_nid);
 919                 if (rc == 0)
 920                         /* prevous done via class_conn2export */
 921                         class_export_get(export);
 922         }
 923         if (rc)
 924                 GOTO(out, rc);
 925         /* Return only the parts of obd_connect_data that we understand, so the
 926          * client knows that we don't understand the rest. */
 927         if (data) {
 928                  tmpdata = req_capsule_server_get(&req->rq_pill,
 929                                                   &RMF_CONNECT_DATA);
 930                   //data->ocd_connect_flags &= OBD_CONNECT_SUPPORTED;
 931                  *tmpdata = *data;
 932         }
 933
 934         /* If all else goes well, this is our RPC return code. */
 935         req->rq_status = 0;
 936
 937         lustre_msg_set_handle(req->rq_repmsg, &conn);
 938
 939         /* If the client and the server are the same node, we will already
 940          * have an export that really points to the client's DLM export,
 941          * because we have a shared handles table.
 942          *
 943          * XXX this will go away when shaver stops sending the "connect" handle
 944          * in the real "remote handle" field of the request --phik 24 Apr 2003
 945          */
 946         if (req->rq_export != NULL)
 947                 class_export_put(req->rq_export);
 948
 949         req->rq_export = export;
 950
 951         cfs_spin_lock(&export->exp_lock);
 952         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
 953                 cfs_spin_unlock(&export->exp_lock);
 954                 CERROR("%s: %s already connected at higher conn_cnt: %d > %d\n",
 955                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 956                        export->exp_conn_cnt,
 957                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
 958
 959                 GOTO(out, rc = -EALREADY);
 960         }
 961         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
 962         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
 963         export->exp_abort_active_req = 0;
 964
 965         /* request from liblustre?  Don't evict it for not pinging. */
 966         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 967                 export->exp_libclient = 1;
 968                 cfs_spin_unlock(&export->exp_lock);
 969
 970                 cfs_spin_lock(&target->obd_dev_lock);
 971                 cfs_list_del_init(&export->exp_obd_chain_timed);
 972                 cfs_spin_unlock(&target->obd_dev_lock);
 973         } else {
 974                 cfs_spin_unlock(&export->exp_lock);
 975         }
 976
 977         if (export->exp_connection != NULL) {
 978                 /* Check to see if connection came from another NID */
 979                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
 980                     !cfs_hlist_unhashed(&export->exp_nid_hash))
 981                         cfs_hash_del(export->exp_obd->obd_nid_hash,
 982                                      &export->exp_connection->c_peer.nid,
 983                                      &export->exp_nid_hash);
 984
 985                 ptlrpc_connection_put(export->exp_connection);
 986         }
 987
 988         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
 989                                                        req->rq_self,
 990                                                        &remote_uuid);
 991         if (cfs_hlist_unhashed(&export->exp_nid_hash)) {
 992                 cfs_hash_add_unique(export->exp_obd->obd_nid_hash,
 993                                     &export->exp_connection->c_peer.nid,
 994                                     &export->exp_nid_hash);
 995         }
 996
 997         cfs_spin_lock_bh(&target->obd_processing_task_lock);
 998         if (target->obd_recovering && !export->exp_in_recovery) {
 999                 cfs_spin_lock(&export->exp_lock);
1000                 export->exp_in_recovery = 1;
1001                 export->exp_req_replay_needed = 1;
1002                 export->exp_lock_replay_needed = 1;
1003                 cfs_spin_unlock(&export->exp_lock);
1004                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
1005                      && (data->ocd_transno == 0))
1006                         CWARN("Connect with zero transno!\n");
1007
1008                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
1009                      && data->ocd_transno < target->obd_next_recovery_transno)
1010                         target->obd_next_recovery_transno = data->ocd_transno;
1011                 target->obd_connected_clients++;
1012                 cfs_atomic_inc(&target->obd_req_replay_clients);
1013                 cfs_atomic_inc(&target->obd_lock_replay_clients);
1014                 if (target->obd_connected_clients ==
1015                     target->obd_max_recoverable_clients)
1016                         cfs_waitq_signal(&target->obd_next_transno_waitq);
1017         }
1018         cfs_spin_unlock_bh(&target->obd_processing_task_lock);
1019         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1020         conn = *tmp;
1021
1022         if (export->exp_imp_reverse != NULL) {
1023                 /* destroyed import can be still referenced in ctxt */
1024                 obd_set_info_async(export, sizeof(KEY_REVIMP_UPD),
1025                                    KEY_REVIMP_UPD, 0, NULL, NULL);
1026
1027                 client_destroy_import(export->exp_imp_reverse);
1028         }
1029
1030         /* for the rest part, we return -ENOTCONN in case of errors
1031          * in order to let client initialize connection again.
1032          */
1033         revimp = export->exp_imp_reverse = class_new_import(target);
1034         if (!revimp) {
1035                 CERROR("fail to alloc new reverse import.\n");
1036                 GOTO(out, rc = -ENOTCONN);
1037         }
1038
1039         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
1040         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
1041         revimp->imp_remote_handle = conn;
1042         revimp->imp_dlm_fake = 1;
1043         revimp->imp_state = LUSTRE_IMP_FULL;
1044
1045         /* unknown versions will be caught in
1046          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
1047         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1048
1049         if ((export->exp_connect_flags & OBD_CONNECT_AT) &&
1050             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1051                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1052         else
1053                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1054
1055         if ((export->exp_connect_flags & OBD_CONNECT_FULL20) &&
1056             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1057                 revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
1058         else
1059                 revimp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
1060
1061         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
1062         if (rc) {
1063                 CERROR("Failed to get sec for reverse import: %d\n", rc);
1064                 export->exp_imp_reverse = NULL;
1065                 class_destroy_import(revimp);
1066         }
1067
1068         class_import_put(revimp);
1069 out:
1070         if (export) {
1071                 cfs_spin_lock(&export->exp_lock);
1072                 export->exp_connecting = 0;
1073                 cfs_spin_unlock(&export->exp_lock);
1074         }
1075         if (targref)
1076                 class_decref(targref, __FUNCTION__, cfs_current());
1077         if (rc)
1078                 req->rq_status = rc;
1079         RETURN(rc);
1080 }
1081
1082 int target_handle_disconnect(struct ptlrpc_request *req)
1083 {
1084         int rc;
1085         ENTRY;
1086
1087         rc = req_capsule_server_pack(&req->rq_pill);
1088         if (rc)
1089                 RETURN(rc);
1090
1091         /* keep the rq_export around so we can send the reply */
1092         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1093
1094         RETURN(0);
1095 }
1096
1097 void target_destroy_export(struct obd_export *exp)
1098 {
1099         /* exports created from last_rcvd data, and "fake"
1100            exports created by lctl don't have an import */
1101         if (exp->exp_imp_reverse != NULL)
1102                 client_destroy_import(exp->exp_imp_reverse);
1103
1104         LASSERT(cfs_atomic_read(&exp->exp_locks_count) == 0);
1105         LASSERT(cfs_atomic_read(&exp->exp_rpc_count) == 0);
1106         LASSERT(cfs_atomic_read(&exp->exp_cb_count) == 0);
1107         LASSERT(cfs_atomic_read(&exp->exp_replay_count) == 0);
1108 }
1109
1110 /*
1111  * Recovery functions
1112  */
1113 static void target_request_copy_get(struct ptlrpc_request *req)
1114 {
1115         class_export_rpc_get(req->rq_export);
1116         LASSERT(cfs_list_empty(&req->rq_list));
1117         CFS_INIT_LIST_HEAD(&req->rq_replay_list);
1118         /* increase refcount to keep request in queue */
1119         LASSERT(cfs_atomic_read(&req->rq_refcount));
1120         cfs_atomic_inc(&req->rq_refcount);
1121         /** let export know it has replays to be handled */
1122         cfs_atomic_inc(&req->rq_export->exp_replay_count);
1123         /* release service thread while request is queued
1124          * we are moving the request from active processing
1125          * to waiting on the replay queue */
1126         ptlrpc_server_active_request_dec(req);
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(cfs_atomic_read(&req->rq_export->exp_replay_count) > 0);
1133         cfs_atomic_dec(&req->rq_export->exp_replay_count);
1134         class_export_rpc_put(req->rq_export);
1135         /* ptlrpc_server_drop_request() assumes the request is active */
1136         ptlrpc_server_active_request_inc(req);
1137         ptlrpc_server_drop_request(req);
1138 }
1139
1140 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1141 {
1142         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1143         struct obd_export     *exp = req->rq_export;
1144         struct ptlrpc_request *reqiter;
1145         int                    dup = 0;
1146
1147         LASSERT(exp);
1148
1149         cfs_spin_lock(&exp->exp_lock);
1150         cfs_list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1151                                 rq_replay_list) {
1152                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1153                         dup = 1;
1154                         break;
1155                 }
1156         }
1157
1158         if (dup) {
1159                 /* we expect it with RESENT and REPLAY flags */
1160                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1161                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1162                         CERROR("invalid flags %x of resent replay\n",
1163                                lustre_msg_get_flags(req->rq_reqmsg));
1164         } else {
1165                 cfs_list_add_tail(&req->rq_replay_list,
1166                                   &exp->exp_req_replay_queue);
1167         }
1168
1169         cfs_spin_unlock(&exp->exp_lock);
1170         return dup;
1171 }
1172
1173 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1174 {
1175         LASSERT(!cfs_list_empty(&req->rq_replay_list));
1176         LASSERT(req->rq_export);
1177
1178         cfs_spin_lock(&req->rq_export->exp_lock);
1179         cfs_list_del_init(&req->rq_replay_list);
1180         cfs_spin_unlock(&req->rq_export->exp_lock);
1181 }
1182
1183 #ifdef __KERNEL__
1184 static void target_finish_recovery(struct obd_device *obd)
1185 {
1186         ENTRY;
1187         LCONSOLE_INFO("%s: sending delayed replies to recovered clients\n",
1188                       obd->obd_name);
1189
1190         ldlm_reprocess_all_ns(obd->obd_namespace);
1191         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1192         if (!cfs_list_empty(&obd->obd_req_replay_queue) ||
1193             !cfs_list_empty(&obd->obd_lock_replay_queue) ||
1194             !cfs_list_empty(&obd->obd_final_req_queue)) {
1195                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1196                        obd->obd_name,
1197                        cfs_list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1198                        cfs_list_empty(&obd->obd_lock_replay_queue) ? \
1199                                "" : "lock ",
1200                        cfs_list_empty(&obd->obd_final_req_queue) ? \
1201                                "" : "final ");
1202                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1203                 LBUG();
1204         }
1205         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1206
1207         obd->obd_recovery_end = cfs_time_current_sec();
1208
1209         /* when recovery finished, cleanup orphans on mds and ost */
1210         if (OBT(obd) && OBP(obd, postrecov)) {
1211                 int rc = OBP(obd, postrecov)(obd);
1212                 if (rc < 0)
1213                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1214                                       obd->obd_name, rc);
1215         }
1216         EXIT;
1217 }
1218
1219 static void abort_req_replay_queue(struct obd_device *obd)
1220 {
1221         struct ptlrpc_request *req, *n;
1222         cfs_list_t abort_list;
1223
1224         CFS_INIT_LIST_HEAD(&abort_list);
1225         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1226         cfs_list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1227         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1228         cfs_list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1229                 DEBUG_REQ(D_WARNING, req, "aborted:");
1230                 req->rq_status = -ENOTCONN;
1231                 if (ptlrpc_error(req)) {
1232                         DEBUG_REQ(D_ERROR, req,
1233                                   "failed abort_req_reply; skipping");
1234                 }
1235                 target_exp_dequeue_req_replay(req);
1236                 target_request_copy_put(req);
1237         }
1238 }
1239
1240 static void abort_lock_replay_queue(struct obd_device *obd)
1241 {
1242         struct ptlrpc_request *req, *n;
1243         cfs_list_t abort_list;
1244
1245         CFS_INIT_LIST_HEAD(&abort_list);
1246         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1247         cfs_list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1248         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1249         cfs_list_for_each_entry_safe(req, n, &abort_list, rq_list){
1250                 DEBUG_REQ(D_ERROR, req, "aborted:");
1251                 req->rq_status = -ENOTCONN;
1252                 if (ptlrpc_error(req)) {
1253                         DEBUG_REQ(D_ERROR, req,
1254                                   "failed abort_lock_reply; skipping");
1255                 }
1256                 target_request_copy_put(req);
1257         }
1258 }
1259 #endif
1260
1261 /* Called from a cleanup function if the device is being cleaned up
1262    forcefully.  The exports should all have been disconnected already,
1263    the only thing left to do is
1264      - clear the recovery flags
1265      - cancel the timer
1266      - free queued requests and replies, but don't send replies
1267    Because the obd_stopping flag is set, no new requests should be received.
1268
1269 */
1270 void target_cleanup_recovery(struct obd_device *obd)
1271 {
1272         struct ptlrpc_request *req, *n;
1273         cfs_list_t clean_list;
1274         ENTRY;
1275
1276         CFS_INIT_LIST_HEAD(&clean_list);
1277         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1278         if (!obd->obd_recovering) {
1279                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1280                 EXIT;
1281                 return;
1282         }
1283         obd->obd_recovering = obd->obd_abort_recovery = 0;
1284         target_cancel_recovery_timer(obd);
1285
1286         cfs_list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1287         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1288
1289         cfs_list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1290                 LASSERT(req->rq_reply_state == 0);
1291                 target_exp_dequeue_req_replay(req);
1292                 target_request_copy_put(req);
1293         }
1294
1295         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1296         cfs_list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1297         cfs_list_splice_init(&obd->obd_final_req_queue, &clean_list);
1298         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1299
1300         cfs_list_for_each_entry_safe(req, n, &clean_list, rq_list){
1301                 LASSERT(req->rq_reply_state == 0);
1302                 target_request_copy_put(req);
1303         }
1304
1305         EXIT;
1306 }
1307
1308 /* obd_processing_task_lock should be held */
1309 void target_cancel_recovery_timer(struct obd_device *obd)
1310 {
1311         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1312         cfs_timer_disarm(&obd->obd_recovery_timer);
1313 }
1314
1315 /* extend = 1 means require at least "duration" seconds left in the timer,
1316    extend = 0 means set the total duration (start_recovery_timer) */
1317 static void reset_recovery_timer(struct obd_device *obd, int duration,
1318                                  int extend)
1319 {
1320         cfs_time_t now = cfs_time_current_sec();
1321         cfs_duration_t left;
1322
1323         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1324         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1325                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1326                 return;
1327         }
1328
1329         left = cfs_time_sub(obd->obd_recovery_end, now);
1330
1331         if (extend && (duration > left))
1332                 obd->obd_recovery_timeout += duration - left;
1333         else if (!extend && (duration > obd->obd_recovery_timeout))
1334                 /* Track the client's largest expected replay time */
1335                 obd->obd_recovery_timeout = duration;
1336
1337         /* Hard limit of obd_recovery_time_hard which should not happen */
1338         if (obd->obd_recovery_timeout > obd->obd_recovery_time_hard)
1339                 obd->obd_recovery_timeout = obd->obd_recovery_time_hard;
1340
1341         obd->obd_recovery_end = obd->obd_recovery_start +
1342                                 obd->obd_recovery_timeout;
1343         if (!cfs_timer_is_armed(&obd->obd_recovery_timer) ||
1344             cfs_time_before(now, obd->obd_recovery_end)) {
1345                 left = cfs_time_sub(obd->obd_recovery_end, now);
1346                 cfs_timer_arm(&obd->obd_recovery_timer, cfs_time_shift(left));
1347         }
1348         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1349         CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
1350                obd->obd_name, (unsigned)left);
1351 }
1352
1353 static void check_and_start_recovery_timer(struct obd_device *obd)
1354 {
1355         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1356         if (cfs_timer_is_armed(&obd->obd_recovery_timer)) {
1357                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1358                 return;
1359         }
1360         CDEBUG(D_HA, "%s: starting recovery timer\n", obd->obd_name);
1361         obd->obd_recovery_start = cfs_time_current_sec();
1362         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1363
1364         reset_recovery_timer(obd, obd->obd_recovery_timeout, 0);
1365 }
1366
1367 /* Reset the timer with each new client connection */
1368 /*
1369  * This timer is actually reconnect_timer, which is for making sure
1370  * the total recovery window is at least as big as my reconnect
1371  * attempt timing. So the initial recovery time_out will be set to
1372  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1373  * from client is bigger than this, then the recovery time_out will
1374  * be extended to make sure the client could be reconnected, in the
1375  * process, the timeout from the new client should be ignored.
1376  */
1377
1378 static void
1379 target_start_and_reset_recovery_timer(struct obd_device *obd,
1380                                       struct ptlrpc_request *req,
1381                                       int new_client)
1382 {
1383         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1384
1385         if (!new_client && service_time)
1386                 /* Teach server about old server's estimates, as first guess
1387                  * at how long new requests will take. */
1388                 at_measured(&req->rq_rqbd->rqbd_service->srv_at_estimate,
1389                             service_time);
1390
1391         check_and_start_recovery_timer(obd);
1392
1393         /* convert the service time to rpc timeout,
1394          * reuse service_time to limit stack usage */
1395         service_time = at_est2timeout(service_time);
1396
1397         /* We expect other clients to timeout within service_time, then try
1398          * to reconnect, then try the failover server.  The max delay between
1399          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL */
1400         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC +
1401                              INITIAL_CONNECT_TIMEOUT);
1402         if (service_time > obd->obd_recovery_timeout && !new_client)
1403                 reset_recovery_timer(obd, service_time, 0);
1404 }
1405
1406 #ifdef __KERNEL__
1407
1408 /** Health checking routines */
1409 static inline int exp_connect_healthy(struct obd_export *exp)
1410 {
1411         return (exp->exp_in_recovery);
1412 }
1413
1414 /** if export done req_replay or has replay in queue */
1415 static inline int exp_req_replay_healthy(struct obd_export *exp)
1416 {
1417         return (!exp->exp_req_replay_needed ||
1418                 cfs_atomic_read(&exp->exp_replay_count) > 0);
1419 }
1420 /** if export done lock_replay or has replay in queue */
1421 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1422 {
1423         return (!exp->exp_lock_replay_needed ||
1424                 cfs_atomic_read(&exp->exp_replay_count) > 0);
1425 }
1426
1427 static inline int exp_vbr_healthy(struct obd_export *exp)
1428 {
1429         return (!exp->exp_vbr_failed);
1430 }
1431
1432 static inline int exp_finished(struct obd_export *exp)
1433 {
1434         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1435 }
1436
1437 /** Checking routines for recovery */
1438 static int check_for_clients(struct obd_device *obd)
1439 {
1440         if (obd->obd_abort_recovery || obd->obd_recovery_expired)
1441                 return 1;
1442         LASSERT(obd->obd_connected_clients <= obd->obd_max_recoverable_clients);
1443         if (obd->obd_no_conn == 0 &&
1444             obd->obd_connected_clients + obd->obd_stale_clients ==
1445             obd->obd_max_recoverable_clients)
1446                 return 1;
1447         return 0;
1448 }
1449
1450 static int check_for_next_transno(struct obd_device *obd)
1451 {
1452         struct ptlrpc_request *req = NULL;
1453         int wake_up = 0, connected, completed, queue_len;
1454         __u64 next_transno, req_transno;
1455         ENTRY;
1456         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1457
1458         if (!cfs_list_empty(&obd->obd_req_replay_queue)) {
1459                 req = cfs_list_entry(obd->obd_req_replay_queue.next,
1460                                      struct ptlrpc_request, rq_list);
1461                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1462         } else {
1463                 req_transno = 0;
1464         }
1465
1466         connected = obd->obd_connected_clients;
1467         completed = connected - cfs_atomic_read(&obd->obd_req_replay_clients);
1468         queue_len = obd->obd_requests_queued_for_recovery;
1469         next_transno = obd->obd_next_recovery_transno;
1470
1471         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1472                "req_transno: "LPU64", next_transno: "LPU64"\n",
1473                obd->obd_max_recoverable_clients, connected, completed,
1474                queue_len, req_transno, next_transno);
1475
1476         if (obd->obd_abort_recovery) {
1477                 CDEBUG(D_HA, "waking for aborted recovery\n");
1478                 wake_up = 1;
1479         } else if (obd->obd_recovery_expired) {
1480                 CDEBUG(D_HA, "waking for expired recovery\n");
1481                 wake_up = 1;
1482         } else if (cfs_atomic_read(&obd->obd_req_replay_clients) == 0) {
1483                 CDEBUG(D_HA, "waking for completed recovery\n");
1484                 wake_up = 1;
1485         } else if (req_transno == next_transno) {
1486                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1487                 wake_up = 1;
1488         } else if (queue_len == cfs_atomic_read(&obd->obd_req_replay_clients)) {
1489                 int d_lvl = D_HA;
1490                 /** handle gaps occured due to lost reply or VBR */
1491                 LASSERTF(req_transno >= next_transno,
1492                          "req_transno: "LPU64", next_transno: "LPU64"\n",
1493                          req_transno, next_transno);
1494                 if (req_transno > obd->obd_last_committed &&
1495                     !obd->obd_version_recov)
1496                         d_lvl = D_ERROR;
1497                 CDEBUG(d_lvl,
1498                        "%s: waking for gap in transno, VBR is %s (skip: "
1499                        LPD64", ql: %d, comp: %d, conn: %d, next: "LPD64
1500                        ", last_committed: "LPD64")\n",
1501                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1502                        next_transno, queue_len, completed, connected,
1503                        req_transno, obd->obd_last_committed);
1504                 obd->obd_next_recovery_transno = req_transno;
1505                 wake_up = 1;
1506         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1507                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1508                        " by fail_lock, waking up ("LPD64")\n", next_transno);
1509                 obd->obd_next_recovery_transno = req_transno;
1510                 wake_up = 1;
1511         }
1512         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1513         return wake_up;
1514 }
1515
1516 static int check_for_next_lock(struct obd_device *obd)
1517 {
1518         int wake_up = 0;
1519
1520         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1521         if (!cfs_list_empty(&obd->obd_lock_replay_queue)) {
1522                 CDEBUG(D_HA, "waking for next lock\n");
1523                 wake_up = 1;
1524         } else if (cfs_atomic_read(&obd->obd_lock_replay_clients) == 0) {
1525                 CDEBUG(D_HA, "waking for completed lock replay\n");
1526                 wake_up = 1;
1527         } else if (obd->obd_abort_recovery) {
1528                 CDEBUG(D_HA, "waking for aborted recovery\n");
1529                 wake_up = 1;
1530         } else if (obd->obd_recovery_expired) {
1531                 CDEBUG(D_HA, "waking for expired recovery\n");
1532                 wake_up = 1;
1533         }
1534         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1535
1536         return wake_up;
1537 }
1538
1539 /**
1540  * wait for recovery events,
1541  * check its status with help of check_routine
1542  * evict dead clients via health_check
1543  */
1544 static int target_recovery_overseer(struct obd_device *obd,
1545                                     int (*check_routine)(struct obd_device *),
1546                                     int (*health_check)(struct obd_export *))
1547 {
1548         int abort = 0, expired = 1;
1549
1550         do {
1551                 cfs_wait_event(obd->obd_next_transno_waitq, check_routine(obd));
1552                 cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1553                 abort = obd->obd_abort_recovery;
1554                 expired = obd->obd_recovery_expired;
1555                 obd->obd_recovery_expired = 0;
1556                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1557                 if (abort) {
1558                         CWARN("recovery is aborted, evict exports in recovery\n");
1559                         /** evict exports which didn't finish recovery yet */
1560                         class_disconnect_stale_exports(obd, exp_finished);
1561                 } else if (expired) {
1562                         /** If some clients died being recovered, evict them */
1563                         CDEBUG(D_WARNING, "recovery is timed out, evict stale exports\n");
1564                         /** evict cexports with no replay in queue, they are stalled */
1565                         class_disconnect_stale_exports(obd, health_check);
1566                         /** continue with VBR */
1567                         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1568                         obd->obd_version_recov = 1;
1569                         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1570                         /**
1571                          * reset timer, recovery will proceed with versions now,
1572                          * timeout is set just to handle reconnection delays
1573                          */
1574                         reset_recovery_timer(obd, RECONNECT_DELAY_MAX, 1);
1575                         /** Wait for recovery events again, after evicting bad clients */
1576                 }
1577         } while (!abort && expired);
1578
1579         return abort;
1580 }
1581
1582 static struct ptlrpc_request *target_next_replay_req(struct obd_device *obd)
1583 {
1584         struct ptlrpc_request *req = NULL;
1585         ENTRY;
1586
1587         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1588                obd->obd_next_recovery_transno);
1589
1590         if (target_recovery_overseer(obd, check_for_next_transno,
1591                                      exp_req_replay_healthy)) {
1592                 abort_req_replay_queue(obd);
1593                 abort_lock_replay_queue(obd);
1594         }
1595
1596         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1597         if (!cfs_list_empty(&obd->obd_req_replay_queue)) {
1598                 req = cfs_list_entry(obd->obd_req_replay_queue.next,
1599                                      struct ptlrpc_request, rq_list);
1600                 cfs_list_del_init(&req->rq_list);
1601                 obd->obd_requests_queued_for_recovery--;
1602                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1603         } else {
1604                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1605                 LASSERT(cfs_list_empty(&obd->obd_req_replay_queue));
1606                 LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients) == 0);
1607                 /** evict exports failed VBR */
1608                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1609         }
1610         RETURN(req);
1611 }
1612
1613 static struct ptlrpc_request *target_next_replay_lock(struct obd_device *obd)
1614 {
1615         struct ptlrpc_request *req = NULL;
1616
1617         CDEBUG(D_HA, "Waiting for lock\n");
1618         if (target_recovery_overseer(obd, check_for_next_lock,
1619                                      exp_lock_replay_healthy))
1620                 abort_lock_replay_queue(obd);
1621
1622         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1623         if (!cfs_list_empty(&obd->obd_lock_replay_queue)) {
1624                 req = cfs_list_entry(obd->obd_lock_replay_queue.next,
1625                                      struct ptlrpc_request, rq_list);
1626                 cfs_list_del_init(&req->rq_list);
1627                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1628         } else {
1629                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1630                 LASSERT(cfs_list_empty(&obd->obd_lock_replay_queue));
1631                 LASSERT(cfs_atomic_read(&obd->obd_lock_replay_clients) == 0);
1632                 /** evict exports failed VBR */
1633                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1634         }
1635         return req;
1636 }
1637
1638 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
1639 {
1640         struct ptlrpc_request *req = NULL;
1641
1642         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1643         if (!cfs_list_empty(&obd->obd_final_req_queue)) {
1644                 req = cfs_list_entry(obd->obd_final_req_queue.next,
1645                                      struct ptlrpc_request, rq_list);
1646                 cfs_list_del_init(&req->rq_list);
1647                 if (req->rq_export->exp_in_recovery) {
1648                         cfs_spin_lock(&req->rq_export->exp_lock);
1649                         req->rq_export->exp_in_recovery = 0;
1650                         cfs_spin_unlock(&req->rq_export->exp_lock);
1651                 }
1652         }
1653         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1654         return req;
1655 }
1656
1657 static int handle_recovery_req(struct ptlrpc_thread *thread,
1658                                struct ptlrpc_request *req,
1659                                svc_handler_t handler)
1660 {
1661         int rc;
1662         ENTRY;
1663
1664         rc = lu_context_init(&req->rq_recov_session, LCT_SESSION);
1665         if (rc) {
1666                 CERROR("Failure to initialize session: %d\n", rc);
1667                 GOTO(reqcopy_put, rc);
1668         }
1669         /**
1670          * export can be evicted during recovery, no need to handle replays for
1671          * it after that, discard such request silently
1672          */
1673         if (req->rq_export->exp_disconnected)
1674                 GOTO(reqcopy_put, rc);
1675
1676         req->rq_recov_session.lc_thread = thread;
1677         lu_context_enter(&req->rq_recov_session);
1678         req->rq_svc_thread = thread;
1679         req->rq_svc_thread->t_env->le_ses = &req->rq_recov_session;
1680
1681         /* thread context */
1682         lu_context_enter(&thread->t_env->le_ctx);
1683         (void)handler(req);
1684         lu_context_exit(&thread->t_env->le_ctx);
1685
1686         lu_context_exit(&req->rq_recov_session);
1687         lu_context_fini(&req->rq_recov_session);
1688         /* don't reset timer for final stage */
1689         if (!exp_finished(req->rq_export)) {
1690                 /**
1691                  * Add request timeout to the recovery time so next request from
1692                  * this client may come in recovery time
1693                  */
1694                  reset_recovery_timer(class_exp2obd(req->rq_export),
1695                                       AT_OFF ? obd_timeout :
1696                                       lustre_msg_get_timeout(req->rq_reqmsg), 1);
1697         }
1698 reqcopy_put:
1699         RETURN(rc);
1700 }
1701
1702 static int target_recovery_thread(void *arg)
1703 {
1704         struct lu_target *lut = arg;
1705         struct obd_device *obd = lut->lut_obd;
1706         struct ptlrpc_request *req;
1707         struct target_recovery_data *trd = &obd->obd_recovery_data;
1708         unsigned long delta;
1709         unsigned long flags;
1710         struct lu_env env;
1711         struct ptlrpc_thread fake_svc_thread, *thread = &fake_svc_thread;
1712         int rc = 0;
1713         ENTRY;
1714
1715         cfs_daemonize_ctxt("tgt_recov");
1716
1717         SIGNAL_MASK_LOCK(current, flags);
1718         sigfillset(&current->blocked);
1719         RECALC_SIGPENDING;
1720         SIGNAL_MASK_UNLOCK(current, flags);
1721
1722         rc = lu_context_init(&env.le_ctx, LCT_MD_THREAD);
1723         if (rc)
1724                 RETURN(rc);
1725
1726         thread->t_env = &env;
1727         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
1728         env.le_ctx.lc_thread = thread;
1729         thread->t_data = NULL;
1730
1731         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
1732                cfs_curproc_pid());
1733         trd->trd_processing_task = cfs_curproc_pid();
1734
1735         obd->obd_recovering = 1;
1736         cfs_complete(&trd->trd_starting);
1737
1738         /* first of all, we have to know the first transno to replay */
1739         if (target_recovery_overseer(obd, check_for_clients,
1740                                      exp_connect_healthy)) {
1741                 abort_req_replay_queue(obd);
1742                 abort_lock_replay_queue(obd);
1743         }
1744
1745         /* next stage: replay requests */
1746         delta = jiffies;
1747         obd->obd_req_replaying = 1;
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_bh(&obd->obd_processing_task_lock);
1763                 obd->obd_next_recovery_transno++;
1764                 cfs_spin_unlock_bh(&obd->obd_processing_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_bh(&obd->obd_processing_task_lock);
1795         obd->obd_recovering = obd->obd_abort_recovery = 0;
1796         target_cancel_recovery_timer(obd);
1797         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1798         while ((req = target_next_final_ping(obd))) {
1799                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1800                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
1801                           libcfs_nid2str(req->rq_peer.nid));
1802                 handle_recovery_req(thread, req,
1803                                     trd->trd_recovery_handler);
1804                 target_request_copy_put(req);
1805         }
1806
1807         delta = (jiffies - delta) / CFS_HZ;
1808         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
1809               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
1810         if (delta > OBD_RECOVERY_TIME_SOFT) {
1811                 CWARN("too long recovery - read logs\n");
1812                 libcfs_debug_dumplog();
1813         }
1814
1815         target_finish_recovery(obd);
1816
1817         lu_context_fini(&env.le_ctx);
1818         trd->trd_processing_task = 0;
1819         cfs_complete(&trd->trd_finishing);
1820         RETURN(rc);
1821 }
1822
1823 static int target_start_recovery_thread(struct lu_target *lut,
1824                                         svc_handler_t handler)
1825 {
1826         struct obd_device *obd = lut->lut_obd;
1827         int rc = 0;
1828         struct target_recovery_data *trd = &obd->obd_recovery_data;
1829
1830         memset(trd, 0, sizeof(*trd));
1831         cfs_init_completion(&trd->trd_starting);
1832         cfs_init_completion(&trd->trd_finishing);
1833         trd->trd_recovery_handler = handler;
1834
1835         if (cfs_kernel_thread(target_recovery_thread, lut, 0) > 0) {
1836                 cfs_wait_for_completion(&trd->trd_starting);
1837                 LASSERT(obd->obd_recovering != 0);
1838         } else
1839                 rc = -ECHILD;
1840
1841         return rc;
1842 }
1843
1844 void target_stop_recovery_thread(struct obd_device *obd)
1845 {
1846         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1847         if (obd->obd_recovery_data.trd_processing_task > 0) {
1848                 struct target_recovery_data *trd = &obd->obd_recovery_data;
1849                 /** recovery can be done but postrecovery is not yet */
1850                 if (obd->obd_recovering) {
1851                         CERROR("%s: Aborting recovery\n", obd->obd_name);
1852                         obd->obd_abort_recovery = 1;
1853                         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1854                 }
1855                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1856                 cfs_wait_for_completion(&trd->trd_finishing);
1857         } else {
1858                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
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         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1880         obd->obd_recovery_expired = 1;
1881         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1882         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1883 }
1884
1885 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
1886 {
1887         struct obd_device *obd = lut->lut_obd;
1888         if (obd->obd_max_recoverable_clients == 0) {
1889                 /** Update server last boot epoch */
1890                 lut_boot_epoch_update(lut);
1891                 return;
1892         }
1893
1894         CWARN("RECOVERY: service %s, %d recoverable clients, "
1895               "last_transno "LPU64"\n", obd->obd_name,
1896               obd->obd_max_recoverable_clients, obd->obd_last_committed);
1897         LASSERT(obd->obd_stopping == 0);
1898         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
1899         obd->obd_recovery_start = 0;
1900         obd->obd_recovery_end = 0;
1901
1902         /* both values can be get from mount data already */
1903         if (obd->obd_recovery_timeout == 0)
1904                 obd->obd_recovery_timeout = OBD_RECOVERY_TIME_SOFT;
1905         if (obd->obd_recovery_time_hard == 0)
1906                 obd->obd_recovery_time_hard = OBD_RECOVERY_TIME_HARD;
1907         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
1908         target_start_recovery_thread(lut, handler);
1909 }
1910 EXPORT_SYMBOL(target_recovery_init);
1911
1912 #endif
1913
1914 static int target_process_req_flags(struct obd_device *obd,
1915                                     struct ptlrpc_request *req)
1916 {
1917         struct obd_export *exp = req->rq_export;
1918         LASSERT(exp != NULL);
1919         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1920                 /* client declares he's ready to replay locks */
1921                 cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1922                 if (exp->exp_req_replay_needed) {
1923                         LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients) >
1924                                 0);
1925                         cfs_spin_lock(&exp->exp_lock);
1926                         exp->exp_req_replay_needed = 0;
1927                         cfs_spin_unlock(&exp->exp_lock);
1928                         cfs_atomic_dec(&obd->obd_req_replay_clients);
1929                 }
1930                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1931         }
1932         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1933                 /* client declares he's ready to complete recovery
1934                  * so, we put the request on th final queue */
1935                 cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1936                 if (exp->exp_lock_replay_needed) {
1937                         LASSERT(cfs_atomic_read(&obd->obd_lock_replay_clients) >
1938                                 0);
1939                         cfs_spin_lock(&exp->exp_lock);
1940                         exp->exp_lock_replay_needed = 0;
1941                         cfs_spin_unlock(&exp->exp_lock);
1942                         cfs_atomic_dec(&obd->obd_lock_replay_clients);
1943                 }
1944                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1945         }
1946
1947         return 0;
1948 }
1949
1950 int target_queue_recovery_request(struct ptlrpc_request *req,
1951                                   struct obd_device *obd)
1952 {
1953         cfs_list_t *tmp;
1954         int inserted = 0;
1955         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1956         ENTRY;
1957
1958         if (obd->obd_recovery_data.trd_processing_task == cfs_curproc_pid()) {
1959                 /* Processing the queue right now, don't re-add. */
1960                 RETURN(1);
1961         }
1962
1963         target_process_req_flags(obd, req);
1964
1965         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1966                 /* client declares he's ready to complete recovery
1967                  * so, we put the request on th final queue */
1968                 target_request_copy_get(req);
1969                 DEBUG_REQ(D_HA, req, "queue final req");
1970                 cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1971                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1972                 if (obd->obd_recovering) {
1973                         cfs_list_add_tail(&req->rq_list,
1974                                           &obd->obd_final_req_queue);
1975                 } else {
1976                         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1977                         target_request_copy_put(req);
1978                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
1979                 }
1980                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1981                 RETURN(0);
1982         }
1983         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1984                 /* client declares he's ready to replay locks */
1985                 target_request_copy_get(req);
1986                 DEBUG_REQ(D_HA, req, "queue lock replay req");
1987                 cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1988                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1989                 LASSERT(obd->obd_recovering);
1990                 /* usually due to recovery abort */
1991                 if (!req->rq_export->exp_in_recovery) {
1992                         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1993                         target_request_copy_put(req);
1994                         RETURN(-ENOTCONN);
1995                 }
1996                 LASSERT(req->rq_export->exp_lock_replay_needed);
1997                 cfs_list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
1998                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1999                 RETURN(0);
2000         }
2001
2002         /* CAVEAT EMPTOR: The incoming request message has been swabbed
2003          * (i.e. buflens etc are in my own byte order), but type-dependent
2004          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
2005
2006         if (!transno) {
2007                 CFS_INIT_LIST_HEAD(&req->rq_list);
2008                 DEBUG_REQ(D_HA, req, "not queueing");
2009                 RETURN(1);
2010         }
2011
2012         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
2013
2014         /* If we're processing the queue, we want don't want to queue this
2015          * message.
2016          *
2017          * Also, if this request has a transno less than the one we're waiting
2018          * for, we should process it now.  It could (and currently always will)
2019          * be an open request for a descriptor that was opened some time ago.
2020          *
2021          * Also, a resent, replayed request that has already been
2022          * handled will pass through here and be processed immediately.
2023          */
2024         CWARN("Next recovery transno: "LPU64", current: "LPU64", replaying: %i\n",
2025               obd->obd_next_recovery_transno, transno, obd->obd_req_replaying);
2026         if (transno < obd->obd_next_recovery_transno && obd->obd_req_replaying) {
2027                 /* Processing the queue right now, don't re-add. */
2028                 LASSERT(cfs_list_empty(&req->rq_list));
2029                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
2030                 RETURN(1);
2031         }
2032         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
2033
2034         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2035                 RETURN(0);
2036
2037         target_request_copy_get(req);
2038         cfs_spin_lock_bh(&obd->obd_processing_task_lock);
2039         LASSERT(obd->obd_recovering);
2040         if (!req->rq_export->exp_in_recovery) {
2041                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
2042                 target_request_copy_put(req);
2043                 RETURN(-ENOTCONN);
2044         }
2045         LASSERT(req->rq_export->exp_req_replay_needed);
2046
2047         if (target_exp_enqueue_req_replay(req)) {
2048                 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
2049                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2050                 target_request_copy_put(req);
2051                 RETURN(0);
2052         }
2053
2054         /* XXX O(n^2) */
2055         cfs_list_for_each(tmp, &obd->obd_req_replay_queue) {
2056                 struct ptlrpc_request *reqiter =
2057                         cfs_list_entry(tmp, struct ptlrpc_request, rq_list);
2058
2059                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2060                         cfs_list_add_tail(&req->rq_list, &reqiter->rq_list);
2061                         inserted = 1;
2062                         break;
2063                 }
2064
2065                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2066                              transno)) {
2067                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2068                                   "has been claimed by another client");
2069                         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
2070                         target_exp_dequeue_req_replay(req);
2071                         target_request_copy_put(req);
2072                         RETURN(0);
2073                 }
2074         }
2075
2076         if (!inserted)
2077                 cfs_list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2078
2079         obd->obd_requests_queued_for_recovery++;
2080         cfs_waitq_signal(&obd->obd_next_transno_waitq);
2081         cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
2082         RETURN(0);
2083 }
2084
2085 /**
2086  * Packs current SLV and Limit into \a req.
2087  */
2088 int target_pack_pool_reply(struct ptlrpc_request *req)
2089 {
2090         struct obd_device *obd;
2091         ENTRY;
2092
2093         /*
2094          * Check that we still have all structures alive as this may
2095          * be some late rpc in shutdown time.
2096          */
2097         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2098                      !exp_connect_lru_resize(req->rq_export))) {
2099                 lustre_msg_set_slv(req->rq_repmsg, 0);
2100                 lustre_msg_set_limit(req->rq_repmsg, 0);
2101                 RETURN(0);
2102         }
2103
2104         /*
2105          * OBD is alive here as export is alive, which we checked above.
2106          */
2107         obd = req->rq_export->exp_obd;
2108
2109         cfs_read_lock(&obd->obd_pool_lock);
2110         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2111         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2112         cfs_read_unlock(&obd->obd_pool_lock);
2113
2114         RETURN(0);
2115 }
2116
2117 int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
2118 {
2119         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2120                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2121                 return (-ECOMM);
2122         }
2123
2124         if (unlikely(rc)) {
2125                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
2126                 req->rq_status = rc;
2127                 return (ptlrpc_send_error(req, 1));
2128         } else {
2129                 DEBUG_REQ(D_NET, req, "sending reply");
2130         }
2131
2132         return (ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT));
2133 }
2134
2135 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2136 {
2137         int                        netrc;
2138         struct ptlrpc_reply_state *rs;
2139         struct obd_device         *obd;
2140         struct obd_export         *exp;
2141         struct ptlrpc_service     *svc;
2142         ENTRY;
2143
2144         if (req->rq_no_reply) {
2145                 EXIT;
2146                 return;
2147         }
2148
2149         svc = req->rq_rqbd->rqbd_service;
2150         rs = req->rq_reply_state;
2151         if (rs == NULL || !rs->rs_difficult) {
2152                 /* no notifiers */
2153                 target_send_reply_msg (req, rc, fail_id);
2154                 EXIT;
2155                 return;
2156         }
2157
2158         /* must be an export if locks saved */
2159         LASSERT (req->rq_export != NULL);
2160         /* req/reply consistent */
2161         LASSERT (rs->rs_service == svc);
2162
2163         /* "fresh" reply */
2164         LASSERT (!rs->rs_scheduled);
2165         LASSERT (!rs->rs_scheduled_ever);
2166         LASSERT (!rs->rs_handled);
2167         LASSERT (!rs->rs_on_net);
2168         LASSERT (rs->rs_export == NULL);
2169         LASSERT (cfs_list_empty(&rs->rs_obd_list));
2170         LASSERT (cfs_list_empty(&rs->rs_exp_list));
2171
2172         exp = class_export_get (req->rq_export);
2173         obd = exp->exp_obd;
2174
2175         /* disable reply scheduling while I'm setting up */
2176         rs->rs_scheduled = 1;
2177         rs->rs_on_net    = 1;
2178         rs->rs_xid       = req->rq_xid;
2179         rs->rs_transno   = req->rq_transno;
2180         rs->rs_export    = exp;
2181         rs->rs_opc       = lustre_msg_get_opc(rs->rs_msg);
2182
2183         cfs_spin_lock(&exp->exp_uncommitted_replies_lock);
2184         CDEBUG(D_NET, "rs transno = "LPU64", last committed = "LPU64"\n",
2185                rs->rs_transno, exp->exp_last_committed);
2186         if (rs->rs_transno > exp->exp_last_committed) {
2187                 /* not committed already */
2188                 cfs_list_add_tail(&rs->rs_obd_list,
2189                                   &exp->exp_uncommitted_replies);
2190         }
2191         cfs_spin_unlock (&exp->exp_uncommitted_replies_lock);
2192
2193         cfs_spin_lock(&exp->exp_lock);
2194         cfs_list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
2195         cfs_spin_unlock(&exp->exp_lock);
2196
2197         netrc = target_send_reply_msg (req, rc, fail_id);
2198
2199         cfs_spin_lock(&svc->srv_lock);
2200
2201         cfs_atomic_inc(&svc->srv_n_difficult_replies);
2202
2203         if (netrc != 0) {
2204                 /* error sending: reply is off the net.  Also we need +1
2205                  * reply ref until ptlrpc_handle_rs() is done
2206                  * with the reply state (if the send was successful, there
2207                  * would have been +1 ref for the net, which
2208                  * reply_out_callback leaves alone) */
2209                 rs->rs_on_net = 0;
2210                 ptlrpc_rs_addref(rs);
2211                 cfs_atomic_inc (&svc->srv_outstanding_replies);
2212         }
2213
2214         cfs_spin_lock(&rs->rs_lock);
2215         if (rs->rs_transno <= exp->exp_last_committed ||
2216             (!rs->rs_on_net && !rs->rs_no_ack) ||
2217              cfs_list_empty(&rs->rs_exp_list) ||     /* completed already */
2218              cfs_list_empty(&rs->rs_obd_list)) {
2219                 CDEBUG(D_HA, "Schedule reply immediately\n");
2220                 ptlrpc_dispatch_difficult_reply(rs);
2221         } else {
2222                 cfs_list_add (&rs->rs_list, &svc->srv_active_replies);
2223                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
2224         }
2225         cfs_spin_unlock(&rs->rs_lock);
2226         cfs_spin_unlock(&svc->srv_lock);
2227         EXIT;
2228 }
2229
2230 int target_handle_ping(struct ptlrpc_request *req)
2231 {
2232         obd_ping(req->rq_export);
2233         return req_capsule_server_pack(&req->rq_pill);
2234 }
2235
2236 void target_committed_to_req(struct ptlrpc_request *req)
2237 {
2238         struct obd_export *exp = req->rq_export;
2239
2240         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2241                 lustre_msg_set_last_committed(req->rq_repmsg,
2242                                               exp->exp_last_committed);
2243         else
2244                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2245                           "%d)", exp->exp_obd->obd_no_transno,
2246                           req->rq_repmsg == NULL);
2247
2248         CDEBUG(D_INFO, "last_committed "LPU64", transno "LPU64", xid "LPU64"\n",
2249                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2250 }
2251 EXPORT_SYMBOL(target_committed_to_req);
2252
2253 int target_handle_qc_callback(struct ptlrpc_request *req)
2254 {
2255         struct obd_quotactl *oqctl;
2256         struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
2257
2258         oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2259         if (oqctl == NULL) {
2260                 CERROR("Can't unpack obd_quotactl\n");
2261                 RETURN(-EPROTO);
2262         }
2263
2264         cli->cl_qchk_stat = oqctl->qc_stat;
2265
2266         return 0;
2267 }
2268
2269 #ifdef HAVE_QUOTA_SUPPORT
2270 int target_handle_dqacq_callback(struct ptlrpc_request *req)
2271 {
2272 #ifdef __KERNEL__
2273         struct obd_device *obd = req->rq_export->exp_obd;
2274         struct obd_device *master_obd = NULL, *lov_obd = NULL;
2275         struct obd_device_target *obt;
2276         struct lustre_quota_ctxt *qctxt;
2277         struct qunit_data *qdata = NULL;
2278         int rc = 0;
2279         ENTRY;
2280
2281         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_DROP_QUOTA_REQ))
2282                 RETURN(rc);
2283
2284         rc = req_capsule_server_pack(&req->rq_pill);
2285         if (rc) {
2286                 CERROR("packing reply failed!: rc = %d\n", rc);
2287                 RETURN(rc);
2288         }
2289
2290         LASSERT(req->rq_export);
2291
2292         qdata = quota_get_qdata(req, QUOTA_REQUEST, QUOTA_EXPORT);
2293         if (IS_ERR(qdata)) {
2294                 rc = PTR_ERR(qdata);
2295                 CDEBUG(D_ERROR, "Can't unpack qunit_data(rc: %d)\n", rc);
2296                 req->rq_status = rc;
2297                 GOTO(out, rc);
2298         }
2299
2300         /* we use the observer */
2301         if (obd_pin_observer(obd, &lov_obd) ||
2302             obd_pin_observer(lov_obd, &master_obd)) {
2303                 CERROR("Can't find the observer, it is recovering\n");
2304                 req->rq_status = -EAGAIN;
2305                 GOTO(out, rc);
2306         }
2307
2308         obt = &master_obd->u.obt;
2309         qctxt = &obt->obt_qctxt;
2310
2311         if (!qctxt->lqc_setup || !qctxt->lqc_valid) {
2312                 /* quota_type has not been processed yet, return EAGAIN
2313                  * until we know whether or not quotas are supposed to
2314                  * be enabled */
2315                 CDEBUG(D_QUOTA, "quota_type not processed yet, return "
2316                        "-EAGAIN\n");
2317                 req->rq_status = -EAGAIN;
2318                 GOTO(out, rc);
2319         }
2320
2321         cfs_down_read(&obt->obt_rwsem);
2322         if (qctxt->lqc_lqs_hash == NULL) {
2323                 cfs_up_read(&obt->obt_rwsem);
2324                 /* quota_type has not been processed yet, return EAGAIN
2325                  * until we know whether or not quotas are supposed to
2326                  * be enabled */
2327                 CDEBUG(D_QUOTA, "quota_ctxt is not ready yet, return "
2328                        "-EAGAIN\n");
2329                 req->rq_status = -EAGAIN;
2330                 GOTO(out, rc);
2331         }
2332
2333         LASSERT(qctxt->lqc_handler);
2334         rc = qctxt->lqc_handler(master_obd, qdata,
2335                                 lustre_msg_get_opc(req->rq_reqmsg));
2336         cfs_up_read(&obt->obt_rwsem);
2337         if (rc && rc != -EDQUOT)
2338                 CDEBUG(rc == -EBUSY  ? D_QUOTA : D_ERROR,
2339                        "dqacq/dqrel failed! (rc:%d)\n", rc);
2340         req->rq_status = rc;
2341
2342         rc = quota_copy_qdata(req, qdata, QUOTA_REPLY, QUOTA_EXPORT);
2343         if (rc < 0) {
2344                 CERROR("Can't pack qunit_data(rc: %d)\n", rc);
2345                 GOTO(out, rc);
2346         }
2347
2348         /* Block the quota req. b=14840 */
2349         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_BLOCK_QUOTA_REQ, obd_timeout);
2350         EXIT;
2351
2352 out:
2353         if (master_obd)
2354                 obd_unpin_observer(lov_obd);
2355         if (lov_obd)
2356                 obd_unpin_observer(obd);
2357
2358         rc = ptlrpc_reply(req);
2359         return rc;
2360 #else
2361         return 0;
2362 #endif /* !__KERNEL__ */
2363 }
2364 #endif /* HAVE_QUOTA_SUPPORT */
2365
2366 ldlm_mode_t lck_compat_array[] = {
2367         [LCK_EX] LCK_COMPAT_EX,
2368         [LCK_PW] LCK_COMPAT_PW,
2369         [LCK_PR] LCK_COMPAT_PR,
2370         [LCK_CW] LCK_COMPAT_CW,
2371         [LCK_CR] LCK_COMPAT_CR,
2372         [LCK_NL] LCK_COMPAT_NL,
2373         [LCK_GROUP] LCK_COMPAT_GROUP,
2374         [LCK_COS] LCK_COMPAT_COS,
2375 };
2376
2377 /**
2378  * Rather arbitrary mapping from LDLM error codes to errno values. This should
2379  * not escape to the user level.
2380  */
2381 int ldlm_error2errno(ldlm_error_t error)
2382 {
2383         int result;
2384
2385         switch (error) {
2386         case ELDLM_OK:
2387                 result = 0;
2388                 break;
2389         case ELDLM_LOCK_CHANGED:
2390                 result = -ESTALE;
2391                 break;
2392         case ELDLM_LOCK_ABORTED:
2393                 result = -ENAVAIL;
2394                 break;
2395         case ELDLM_LOCK_REPLACED:
2396                 result = -ESRCH;
2397                 break;
2398         case ELDLM_NO_LOCK_DATA:
2399                 result = -ENOENT;
2400                 break;
2401         case ELDLM_NAMESPACE_EXISTS:
2402                 result = -EEXIST;
2403                 break;
2404         case ELDLM_BAD_NAMESPACE:
2405                 result = -EBADF;
2406                 break;
2407         default:
2408                 if (((int)error) < 0)  /* cast to signed type */
2409                         result = error; /* as ldlm_error_t can be unsigned */
2410                 else {
2411                         CERROR("Invalid DLM result code: %i\n", error);
2412                         result = -EPROTO;
2413                 }
2414         }
2415         return result;
2416 }
2417 EXPORT_SYMBOL(ldlm_error2errno);
2418
2419 /**
2420  * Dual to ldlm_error2errno(): maps errno values back to ldlm_error_t.
2421  */
2422 ldlm_error_t ldlm_errno2error(int err_no)
2423 {
2424         int error;
2425
2426         switch (err_no) {
2427         case 0:
2428                 error = ELDLM_OK;
2429                 break;
2430         case -ESTALE:
2431                 error = ELDLM_LOCK_CHANGED;
2432                 break;
2433         case -ENAVAIL:
2434                 error = ELDLM_LOCK_ABORTED;
2435                 break;
2436         case -ESRCH:
2437                 error = ELDLM_LOCK_REPLACED;
2438                 break;
2439         case -ENOENT:
2440                 error = ELDLM_NO_LOCK_DATA;
2441                 break;
2442         case -EEXIST:
2443                 error = ELDLM_NAMESPACE_EXISTS;
2444                 break;
2445         case -EBADF:
2446                 error = ELDLM_BAD_NAMESPACE;
2447                 break;
2448         default:
2449                 error = err_no;
2450         }
2451         return error;
2452 }
2453 EXPORT_SYMBOL(ldlm_errno2error);
2454
2455 #if LUSTRE_TRACKS_LOCK_EXP_REFS
2456 void ldlm_dump_export_locks(struct obd_export *exp)
2457 {
2458         cfs_spin_lock(&exp->exp_locks_list_guard);
2459         if (!cfs_list_empty(&exp->exp_locks_list)) {
2460             struct ldlm_lock *lock;
2461
2462             CERROR("dumping locks for export %p,"
2463                    "ignore if the unmount doesn't hang\n", exp);
2464             cfs_list_for_each_entry(lock, &exp->exp_locks_list, l_exp_refs_link)
2465                 ldlm_lock_dump(D_ERROR, lock, 0);
2466         }
2467         cfs_spin_unlock(&exp->exp_locks_list_guard);
2468 }
2469 #endif