lustre/ldlm/ldlm_lib.c

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