lustre/ldlm/ldlm_lib.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #ifndef EXPORT_SYMTAB
  38 # define EXPORT_SYMTAB
  39 #endif
  40 #define DEBUG_SUBSYSTEM S_LDLM
  41
  42 #ifdef __KERNEL__
  43 # include <libcfs/libcfs.h>
  44 #else
  45 # include <liblustre.h>
  46 #endif
  47 #include <obd.h>
  48 #include <lustre_mds.h>
  49 #include <lustre_dlm.h>
  50 #include <lustre_net.h>
  51 #include <lustre_sec.h>
  52 #include "ldlm_internal.h"
  53
  54 /* @priority: if non-zero, move the selected to the list head
  55  * @create: if zero, only search in existed connections
  56  */
  57 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  58                            int priority, int create)
  59 {
  60         struct ptlrpc_connection *ptlrpc_conn;
  61         struct obd_import_conn *imp_conn = NULL, *item;
  62         int rc = 0;
  63         ENTRY;
  64
  65         if (!create && !priority) {
  66                 CDEBUG(D_HA, "Nothing to do\n");
  67                 RETURN(-EINVAL);
  68         }
  69
  70         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
  71         if (!ptlrpc_conn) {
  72                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  73                 RETURN (-ENOENT);
  74         }
  75
  76         if (create) {
  77                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  78                 if (!imp_conn) {
  79                         GOTO(out_put, rc = -ENOMEM);
  80                 }
  81         }
  82
  83         cfs_spin_lock(&imp->imp_lock);
  84         cfs_list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  85                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  86                         if (priority) {
  87                                 cfs_list_del(&item->oic_item);
  88                                 cfs_list_add(&item->oic_item,
  89                                              &imp->imp_conn_list);
  90                                 item->oic_last_attempt = 0;
  91                         }
  92                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  93                                imp, imp->imp_obd->obd_name, uuid->uuid,
  94                                (priority ? ", moved to head" : ""));
  95                         cfs_spin_unlock(&imp->imp_lock);
  96                         GOTO(out_free, rc = 0);
  97                 }
  98         }
  99         /* not found */
 100         if (create) {
 101                 imp_conn->oic_conn = ptlrpc_conn;
 102                 imp_conn->oic_uuid = *uuid;
 103                 imp_conn->oic_last_attempt = 0;
 104                 if (priority)
 105                         cfs_list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 106                 else
 107                         cfs_list_add_tail(&imp_conn->oic_item,
 108                                           &imp->imp_conn_list);
 109                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 110                        imp, imp->imp_obd->obd_name, uuid->uuid,
 111                        (priority ? "head" : "tail"));
 112         } else {
 113                 cfs_spin_unlock(&imp->imp_lock);
 114                 GOTO(out_free, rc = -ENOENT);
 115         }
 116
 117         cfs_spin_unlock(&imp->imp_lock);
 118         RETURN(0);
 119 out_free:
 120         if (imp_conn)
 121                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 122 out_put:
 123         ptlrpc_connection_put(ptlrpc_conn);
 124         RETURN(rc);
 125 }
 126
 127 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 128 {
 129         return import_set_conn(imp, uuid, 1, 0);
 130 }
 131
 132 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 133                            int priority)
 134 {
 135         return import_set_conn(imp, uuid, priority, 1);
 136 }
 137
 138 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 139 {
 140         struct obd_import_conn *imp_conn;
 141         struct obd_export *dlmexp;
 142         int rc = -ENOENT;
 143         ENTRY;
 144
 145         cfs_spin_lock(&imp->imp_lock);
 146         if (cfs_list_empty(&imp->imp_conn_list)) {
 147                 LASSERT(!imp->imp_connection);
 148                 GOTO(out, rc);
 149         }
 150
 151         cfs_list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 152                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 153                         continue;
 154                 LASSERT(imp_conn->oic_conn);
 155
 156                 /* is current conn? */
 157                 if (imp_conn == imp->imp_conn_current) {
 158                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 159
 160                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 161                             imp->imp_state != LUSTRE_IMP_DISCON) {
 162                                 CERROR("can't remove current connection\n");
 163                                 GOTO(out, rc = -EBUSY);
 164                         }
 165
 166                         ptlrpc_connection_put(imp->imp_connection);
 167                         imp->imp_connection = NULL;
 168
 169                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 170                         if (dlmexp && dlmexp->exp_connection) {
 171                                 LASSERT(dlmexp->exp_connection ==
 172                                         imp_conn->oic_conn);
 173                                 ptlrpc_connection_put(dlmexp->exp_connection);
 174                                 dlmexp->exp_connection = NULL;
 175                         }
 176                 }
 177
 178                 cfs_list_del(&imp_conn->oic_item);
 179                 ptlrpc_connection_put(imp_conn->oic_conn);
 180                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 181                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 182                        imp, imp->imp_obd->obd_name, uuid->uuid);
 183                 rc = 0;
 184                 break;
 185         }
 186 out:
 187         cfs_spin_unlock(&imp->imp_lock);
 188         if (rc == -ENOENT)
 189                 CERROR("connection %s not found\n", uuid->uuid);
 190         RETURN(rc);
 191 }
 192
 193 void client_destroy_import(struct obd_import *imp)
 194 {
 195         /* drop security policy instance after all rpc finished/aborted
 196          * to let all busy contexts be released. */
 197         class_import_get(imp);
 198         class_destroy_import(imp);
 199         sptlrpc_import_sec_put(imp);
 200         class_import_put(imp);
 201 }
 202
 203 /* configure an RPC client OBD device
 204  *
 205  * lcfg parameters:
 206  * 1 - client UUID
 207  * 2 - server UUID
 208  * 3 - inactive-on-startup
 209  */
 210 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 211 {
 212         struct client_obd *cli = &obddev->u.cli;
 213         struct obd_import *imp;
 214         struct obd_uuid server_uuid;
 215         int rq_portal, rp_portal, connect_op;
 216         char *name = obddev->obd_type->typ_name;
 217         ldlm_ns_type_t ns_type = LDLM_NS_TYPE_UNKNOWN;
 218         int rc;
 219         ENTRY;
 220
 221         /* In a more perfect world, we would hang a ptlrpc_client off of
 222          * obd_type and just use the values from there. */
 223         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 224                 rq_portal = OST_REQUEST_PORTAL;
 225                 rp_portal = OSC_REPLY_PORTAL;
 226                 connect_op = OST_CONNECT;
 227                 cli->cl_sp_me = LUSTRE_SP_CLI;
 228                 cli->cl_sp_to = LUSTRE_SP_OST;
 229                 ns_type = LDLM_NS_TYPE_OSC;
 230
 231         } else if (!strcmp(name, LUSTRE_MDC_NAME)) {
 232                 rq_portal = MDS_REQUEST_PORTAL;
 233                 rp_portal = MDC_REPLY_PORTAL;
 234                 connect_op = MDS_CONNECT;
 235                 cli->cl_sp_me = LUSTRE_SP_CLI;
 236                 cli->cl_sp_to = LUSTRE_SP_MDT;
 237                 ns_type = LDLM_NS_TYPE_MDC;
 238
 239         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 240                 rq_portal = MGS_REQUEST_PORTAL;
 241                 rp_portal = MGC_REPLY_PORTAL;
 242                 connect_op = MGS_CONNECT;
 243                 cli->cl_sp_me = LUSTRE_SP_MGC;
 244                 cli->cl_sp_to = LUSTRE_SP_MGS;
 245                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 246                 ns_type = LDLM_NS_TYPE_MGC;
 247
 248         } else {
 249                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 250                        name);
 251                 RETURN(-EINVAL);
 252         }
 253
 254         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 255                 CERROR("requires a TARGET UUID\n");
 256                 RETURN(-EINVAL);
 257         }
 258
 259         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 260                 CERROR("client UUID must be less than 38 characters\n");
 261                 RETURN(-EINVAL);
 262         }
 263
 264         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 265                 CERROR("setup requires a SERVER UUID\n");
 266                 RETURN(-EINVAL);
 267         }
 268
 269         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 270                 CERROR("target UUID must be less than 38 characters\n");
 271                 RETURN(-EINVAL);
 272         }
 273
 274         cfs_init_rwsem(&cli->cl_sem);
 275         cfs_sema_init(&cli->cl_mgc_sem, 1);
 276         cli->cl_conn_count = 0;
 277         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 278                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 279                      sizeof(server_uuid)));
 280
 281         cli->cl_dirty = 0;
 282         cli->cl_avail_grant = 0;
 283         /* FIXME: should limit this for the sum of all cl_dirty_max */
 284         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 285         if (cli->cl_dirty_max >> CFS_PAGE_SHIFT > cfs_num_physpages / 8)
 286                 cli->cl_dirty_max = cfs_num_physpages << (CFS_PAGE_SHIFT - 3);
 287         CFS_INIT_LIST_HEAD(&cli->cl_cache_waiters);
 288         CFS_INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 289         CFS_INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 290         CFS_INIT_LIST_HEAD(&cli->cl_loi_write_list);
 291         CFS_INIT_LIST_HEAD(&cli->cl_loi_read_list);
 292         CFS_INIT_LIST_HEAD(&cli->cl_loi_sync_fs_list);
 293         client_obd_list_lock_init(&cli->cl_loi_list_lock);
 294         cli->cl_r_in_flight = 0;
 295         cli->cl_w_in_flight = 0;
 296
 297         cfs_spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 298         cfs_spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 299         cfs_spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 300         cfs_spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 301         cfs_spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 302         cfs_spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 303         cfs_waitq_init(&cli->cl_destroy_waitq);
 304         cfs_atomic_set(&cli->cl_destroy_in_flight, 0);
 305 #ifdef ENABLE_CHECKSUM
 306         /* Turn on checksumming by default. */
 307         cli->cl_checksum = 1;
 308         /*
 309          * The supported checksum types will be worked out at connect time
 310          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 311          * through procfs.
 312          */
 313         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 314 #endif
 315         cfs_atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 316
 317         /* This value may be changed at connect time in
 318            ptlrpc_connect_interpret. */
 319         cli->cl_max_pages_per_rpc = min((int)PTLRPC_MAX_BRW_PAGES,
 320                                         (int)(1024 * 1024 >> CFS_PAGE_SHIFT));
 321
 322         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 323                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
 324         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 128 /* MB */) {
 325                 cli->cl_max_rpcs_in_flight = 2;
 326         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 256 /* MB */) {
 327                 cli->cl_max_rpcs_in_flight = 3;
 328         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 512 /* MB */) {
 329                 cli->cl_max_rpcs_in_flight = 4;
 330         } else {
 331                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 332         }
 333
 334         rc = ldlm_get_ref();
 335         if (rc) {
 336                 CERROR("ldlm_get_ref failed: %d\n", rc);
 337                 GOTO(err, rc);
 338         }
 339
 340         ptlrpc_init_client(rq_portal, rp_portal, name,
 341                            &obddev->obd_ldlm_client);
 342
 343         imp = class_new_import(obddev);
 344         if (imp == NULL)
 345                 GOTO(err_ldlm, rc = -ENOENT);
 346         imp->imp_client = &obddev->obd_ldlm_client;
 347         imp->imp_connect_op = connect_op;
 348         CFS_INIT_LIST_HEAD(&imp->imp_pinger_chain);
 349         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 350                LUSTRE_CFG_BUFLEN(lcfg, 1));
 351         class_import_put(imp);
 352
 353         rc = client_import_add_conn(imp, &server_uuid, 1);
 354         if (rc) {
 355                 CERROR("can't add initial connection\n");
 356                 GOTO(err_import, rc);
 357         }
 358
 359         cli->cl_import = imp;
 360         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 361         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 362         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 363
 364         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 365                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 366                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 367                                name, obddev->obd_name,
 368                                cli->cl_target_uuid.uuid);
 369                         cfs_spin_lock(&imp->imp_lock);
 370                         imp->imp_deactive = 1;
 371                         cfs_spin_unlock(&imp->imp_lock);
 372                 }
 373         }
 374
 375         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 376                                                    LDLM_NAMESPACE_CLIENT,
 377                                                    LDLM_NAMESPACE_GREEDY,
 378                                                    ns_type);
 379         if (obddev->obd_namespace == NULL) {
 380                 CERROR("Unable to create client namespace - %s\n",
 381                        obddev->obd_name);
 382                 GOTO(err_import, rc = -ENOMEM);
 383         }
 384
 385         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 386
 387         RETURN(rc);
 388
 389 err_import:
 390         class_destroy_import(imp);
 391 err_ldlm:
 392         ldlm_put_ref();
 393 err:
 394         RETURN(rc);
 395
 396 }
 397
 398 int client_obd_cleanup(struct obd_device *obddev)
 399 {
 400         ENTRY;
 401
 402         ldlm_namespace_free_post(obddev->obd_namespace);
 403         obddev->obd_namespace = NULL;
 404
 405         ldlm_put_ref();
 406         RETURN(0);
 407 }
 408
 409 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 410 int client_connect_import(const struct lu_env *env,
 411                           struct obd_export **exp,
 412                           struct obd_device *obd, struct obd_uuid *cluuid,
 413                           struct obd_connect_data *data, void *localdata)
 414 {
 415         struct client_obd *cli = &obd->u.cli;
 416         struct obd_import *imp = cli->cl_import;
 417         struct obd_connect_data *ocd;
 418         struct lustre_handle conn = { 0 };
 419         int rc;
 420         ENTRY;
 421
 422         *exp = NULL;
 423         cfs_down_write(&cli->cl_sem);
 424         if (cli->cl_conn_count > 0 )
 425                 GOTO(out_sem, rc = -EALREADY);
 426
 427         rc = class_connect(&conn, obd, cluuid);
 428         if (rc)
 429                 GOTO(out_sem, rc);
 430
 431         cli->cl_conn_count++;
 432         *exp = class_conn2export(&conn);
 433
 434         LASSERT(obd->obd_namespace);
 435
 436         imp->imp_dlm_handle = conn;
 437         rc = ptlrpc_init_import(imp);
 438         if (rc != 0)
 439                 GOTO(out_ldlm, rc);
 440
 441         ocd = &imp->imp_connect_data;
 442         if (data) {
 443                 *ocd = *data;
 444                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 445         }
 446
 447         rc = ptlrpc_connect_import(imp, NULL);
 448         if (rc != 0) {
 449                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 450                 GOTO(out_ldlm, rc);
 451         }
 452         LASSERT((*exp)->exp_connection);
 453
 454         if (data) {
 455                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 456                          ocd->ocd_connect_flags, "old "LPX64", new "LPX64"\n",
 457                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 458                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 459         }
 460
 461         ptlrpc_pinger_add_import(imp);
 462
 463         EXIT;
 464
 465         if (rc) {
 466 out_ldlm:
 467                 cli->cl_conn_count--;
 468                 class_disconnect(*exp);
 469                 *exp = NULL;
 470         }
 471 out_sem:
 472         cfs_up_write(&cli->cl_sem);
 473
 474         return rc;
 475 }
 476
 477 int client_disconnect_export(struct obd_export *exp)
 478 {
 479         struct obd_device *obd = class_exp2obd(exp);
 480         struct client_obd *cli;
 481         struct obd_import *imp;
 482         int rc = 0, err;
 483         ENTRY;
 484
 485         if (!obd) {
 486                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 487                        exp, exp ? exp->exp_handle.h_cookie : -1);
 488                 RETURN(-EINVAL);
 489         }
 490
 491         cli = &obd->u.cli;
 492         imp = cli->cl_import;
 493
 494         cfs_down_write(&cli->cl_sem);
 495         CDEBUG(D_INFO, "disconnect %s - %d\n", obd->obd_name,
 496                cli->cl_conn_count);
 497
 498         if (!cli->cl_conn_count) {
 499                 CERROR("disconnecting disconnected device (%s)\n",
 500                        obd->obd_name);
 501                 GOTO(out_disconnect, rc = -EINVAL);
 502         }
 503
 504         cli->cl_conn_count--;
 505         if (cli->cl_conn_count)
 506                 GOTO(out_disconnect, rc = 0);
 507
 508         /* Mark import deactivated now, so we don't try to reconnect if any
 509          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
 510          * fully deactivate the import, or that would drop all requests. */
 511         cfs_spin_lock(&imp->imp_lock);
 512         imp->imp_deactive = 1;
 513         cfs_spin_unlock(&imp->imp_lock);
 514
 515         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 516          * delete it regardless.  (It's safe to delete an import that was
 517          * never added.) */
 518         (void)ptlrpc_pinger_del_import(imp);
 519
 520         if (obd->obd_namespace != NULL) {
 521                 /* obd_force == local only */
 522                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 523                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 524                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 525         }
 526
 527         /*
 528          * there's no need to hold sem during disconnecting an import,
 529          * and actually it may cause deadlock in gss.
 530          */
 531         cfs_up_write(&cli->cl_sem);
 532         rc = ptlrpc_disconnect_import(imp, 0);
 533         cfs_down_write(&cli->cl_sem);
 534
 535         ptlrpc_invalidate_import(imp);
 536
 537         if (imp->imp_rq_pool) {
 538                 ptlrpc_free_rq_pool(imp->imp_rq_pool);
 539                 imp->imp_rq_pool = NULL;
 540         }
 541         client_destroy_import(imp);
 542         cli->cl_import = NULL;
 543
 544         EXIT;
 545
 546  out_disconnect:
 547         /* use server style - class_disconnect should be always called for
 548          * o_disconnect */
 549         err = class_disconnect(exp);
 550         if (!rc && err)
 551                 rc = err;
 552
 553         cfs_up_write(&cli->cl_sem);
 554
 555         RETURN(rc);
 556 }
 557
 558 int server_disconnect_export(struct obd_export *exp)
 559 {
 560         int rc;
 561         ENTRY;
 562
 563         /* Disconnect early so that clients can't keep using export */
 564         rc = class_disconnect(exp);
 565         /* close import for avoid sending any requests */
 566         if (exp->exp_imp_reverse)
 567                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 568
 569         if (exp->exp_obd->obd_namespace != NULL)
 570                 ldlm_cancel_locks_for_export(exp);
 571
 572         /* complete all outstanding replies */
 573         cfs_spin_lock(&exp->exp_lock);
 574         while (!cfs_list_empty(&exp->exp_outstanding_replies)) {
 575                 struct ptlrpc_reply_state *rs =
 576                         cfs_list_entry(exp->exp_outstanding_replies.next,
 577                                        struct ptlrpc_reply_state, rs_exp_list);
 578                 struct ptlrpc_service *svc = rs->rs_service;
 579
 580                 cfs_spin_lock(&svc->srv_rs_lock);
 581                 cfs_list_del_init(&rs->rs_exp_list);
 582                 cfs_spin_lock(&rs->rs_lock);
 583                 ptlrpc_schedule_difficult_reply(rs);
 584                 cfs_spin_unlock(&rs->rs_lock);
 585                 cfs_spin_unlock(&svc->srv_rs_lock);
 586         }
 587         cfs_spin_unlock(&exp->exp_lock);
 588
 589         RETURN(rc);
 590 }
 591
 592 /* --------------------------------------------------------------------------
 593  * from old lib/target.c
 594  * -------------------------------------------------------------------------- */
 595
 596 static int target_handle_reconnect(struct lustre_handle *conn,
 597                                    struct obd_export *exp,
 598                                    struct obd_uuid *cluuid)
 599 {
 600         ENTRY;
 601         if (exp->exp_connection && exp->exp_imp_reverse) {
 602                 struct lustre_handle *hdl;
 603                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 604                 /* Might be a re-connect after a partition. */
 605                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 606                         CWARN("%s: %s reconnecting\n", exp->exp_obd->obd_name,
 607                               cluuid->uuid);
 608                         conn->cookie = exp->exp_handle.h_cookie;
 609                         /* target_handle_connect() treats EALREADY and
 610                          * -EALREADY differently.  EALREADY means we are
 611                          * doing a valid reconnect from the same client. */
 612                         RETURN(EALREADY);
 613                 } else {
 614                         CERROR("%s reconnecting from %s, "
 615                                "handle mismatch (ours "LPX64", theirs "
 616                                LPX64")\n", cluuid->uuid,
 617                                exp->exp_connection->c_remote_uuid.uuid,
 618                                hdl->cookie, conn->cookie);
 619                         memset(conn, 0, sizeof *conn);
 620                         /* target_handle_connect() treats EALREADY and
 621                          * -EALREADY differently.  -EALREADY is an error
 622                          * (same UUID, different handle). */
 623                         RETURN(-EALREADY);
 624                 }
 625         }
 626
 627         conn->cookie = exp->exp_handle.h_cookie;
 628         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
 629                cluuid->uuid, exp, conn->cookie);
 630         RETURN(0);
 631 }
 632
 633 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
 634                           int error)
 635 {
 636         struct obd_export *exp = cb_data;
 637
 638         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 639                obd->obd_name, exp->exp_client_uuid.uuid);
 640
 641         cfs_spin_lock(&exp->exp_lock);
 642         exp->exp_need_sync = 0;
 643         cfs_spin_unlock(&exp->exp_lock);
 644         class_export_cb_put(exp);
 645 }
 646 EXPORT_SYMBOL(target_client_add_cb);
 647
 648 static void
 649 target_start_and_reset_recovery_timer(struct obd_device *obd,
 650                                       struct ptlrpc_request *req,
 651                                       int new_client);
 652
 653 int target_handle_connect(struct ptlrpc_request *req)
 654 {
 655         struct obd_device *target, *targref = NULL;
 656         struct obd_export *export = NULL;
 657         struct obd_import *revimp;
 658         struct lustre_handle conn;
 659         struct lustre_handle *tmp;
 660         struct obd_uuid tgtuuid;
 661         struct obd_uuid cluuid;
 662         struct obd_uuid remote_uuid;
 663         char *str;
 664         int rc = 0;
 665         int mds_conn = 0;
 666         struct obd_connect_data *data, *tmpdata;
 667         lnet_nid_t *client_nid = NULL;
 668         ENTRY;
 669
 670         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 671
 672         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 673         if (str == NULL) {
 674                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 675                 GOTO(out, rc = -EINVAL);
 676         }
 677
 678         obd_str2uuid(&tgtuuid, str);
 679         target = class_uuid2obd(&tgtuuid);
 680         if (!target)
 681                 target = class_name2obd(str);
 682
 683         if (!target || target->obd_stopping || !target->obd_set_up) {
 684                 LCONSOLE_ERROR_MSG(0x137, "UUID '%s' is not available "
 685                                    " for connect (%s)\n", str,
 686                                    !target ? "no target" :
 687                                    (target->obd_stopping ? "stopping" :
 688                                    "not set up"));
 689                 GOTO(out, rc = -ENODEV);
 690         }
 691
 692         if (target->obd_no_conn) {
 693                 LCONSOLE_WARN("%s: temporarily refusing client connection "
 694                               "from %s\n", target->obd_name,
 695                               libcfs_nid2str(req->rq_peer.nid));
 696                 GOTO(out, rc = -EAGAIN);
 697         }
 698
 699         /* Make sure the target isn't cleaned up while we're here. Yes,
 700            there's still a race between the above check and our incref here.
 701            Really, class_uuid2obd should take the ref. */
 702         targref = class_incref(target, __FUNCTION__, cfs_current());
 703
 704
 705         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
 706         if (str == NULL) {
 707                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
 708                 GOTO(out, rc = -EINVAL);
 709         }
 710
 711         obd_str2uuid(&cluuid, str);
 712
 713         /* XXX extract a nettype and format accordingly */
 714         switch (sizeof(lnet_nid_t)) {
 715                 /* NB the casts only avoid compiler warnings */
 716         case 8:
 717                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 718                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
 719                 break;
 720         case 4:
 721                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 722                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
 723                 break;
 724         default:
 725                 LBUG();
 726         }
 727
 728         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 729         if (tmp == NULL)
 730                 GOTO(out, rc = -EPROTO);
 731
 732         conn = *tmp;
 733
 734         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 735         if (!data)
 736                 GOTO(out, rc = -EPROTO);
 737
 738         rc = req_capsule_server_pack(&req->rq_pill);
 739         if (rc)
 740                 GOTO(out, rc);
 741
 742         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 743                 if (!data) {
 744                         DEBUG_REQ(D_WARNING, req, "Refusing old (unversioned) "
 745                                   "libclient connection attempt");
 746                         GOTO(out, rc = -EPROTO);
 747                 } else if (data->ocd_version < LUSTRE_VERSION_CODE -
 748                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
 749                            data->ocd_version > LUSTRE_VERSION_CODE +
 750                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
 751                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
 752                                   "libclient connection attempt",
 753                                   data->ocd_version < LUSTRE_VERSION_CODE ?
 754                                   "old" : "new",
 755                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
 756                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
 757                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
 758                                   OBD_OCD_VERSION_FIX(data->ocd_version));
 759                         data = req_capsule_server_sized_get(&req->rq_pill,
 760                                                         &RMF_CONNECT_DATA,
 761                                     offsetof(typeof(*data), ocd_version) +
 762                                              sizeof(data->ocd_version));
 763                         if (data) {
 764                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
 765                                 data->ocd_version = LUSTRE_VERSION_CODE;
 766                         }
 767                         GOTO(out, rc = -EPROTO);
 768                 }
 769         }
 770
 771         if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) &&
 772             (data->ocd_connect_flags & OBD_CONNECT_MDS))
 773                 mds_conn = 1;
 774
 775         /* lctl gets a backstage, all-access pass. */
 776         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 777                 goto dont_check_exports;
 778
 779         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
 780         if (!export)
 781                 goto no_export;
 782
 783         /* we've found an export in the hash */
 784         if (export->exp_connecting) { /* bug 9635, et. al. */
 785                 CWARN("%s: exp %p already connecting\n",
 786                       export->exp_obd->obd_name, export);
 787                 class_export_put(export);
 788                 export = NULL;
 789                 rc = -EALREADY;
 790         } else if (mds_conn && export->exp_connection) {
 791                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid)
 792                         /* mds reconnected after failover */
 793                         CWARN("%s: received MDS connection from NID %s,"
 794                               " removing former export from NID %s\n",
 795                             target->obd_name, libcfs_nid2str(req->rq_peer.nid),
 796                             libcfs_nid2str(export->exp_connection->c_peer.nid));
 797                 else
 798                         /* new mds connection from the same nid */
 799                         CWARN("%s: received new MDS connection from NID %s,"
 800                               " removing former export from same NID\n",
 801                             target->obd_name, libcfs_nid2str(req->rq_peer.nid));
 802                 class_fail_export(export);
 803                 class_export_put(export);
 804                 export = NULL;
 805                 rc = 0;
 806         } else if (export->exp_connection != NULL &&
 807                    req->rq_peer.nid != export->exp_connection->c_peer.nid &&
 808                    (lustre_msg_get_op_flags(req->rq_reqmsg) &
 809                     MSG_CONNECT_INITIAL)) {
 810                 /* in mds failover we have static uuid but nid can be
 811                  * changed*/
 812                 CWARN("%s: cookie %s seen on new NID %s when "
 813                       "existing NID %s is already connected\n",
 814                       target->obd_name, cluuid.uuid,
 815                       libcfs_nid2str(req->rq_peer.nid),
 816                       libcfs_nid2str(export->exp_connection->c_peer.nid));
 817                 rc = -EALREADY;
 818                 class_export_put(export);
 819                 export = NULL;
 820         } else {
 821                 cfs_spin_lock(&export->exp_lock);
 822                 export->exp_connecting = 1;
 823                 cfs_spin_unlock(&export->exp_lock);
 824                 class_export_put(export);
 825                 LASSERT(export->exp_obd == target);
 826
 827                 rc = target_handle_reconnect(&conn, export, &cluuid);
 828         }
 829
 830         /* If we found an export, we already unlocked. */
 831         if (!export) {
 832 no_export:
 833                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
 834         } else if (req->rq_export == NULL &&
 835                    cfs_atomic_read(&export->exp_rpc_count) > 0) {
 836                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
 837                       target->obd_name, cluuid.uuid,
 838                       libcfs_nid2str(req->rq_peer.nid),
 839                       export, cfs_atomic_read(&export->exp_refcount));
 840                 GOTO(out, rc = -EBUSY);
 841         } else if (req->rq_export != NULL &&
 842                    (cfs_atomic_read(&export->exp_rpc_count) > 1)) {
 843                 /* the current connect rpc has increased exp_rpc_count */
 844                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
 845                       target->obd_name, cluuid.uuid,
 846                       libcfs_nid2str(req->rq_peer.nid),
 847                       export, cfs_atomic_read(&export->exp_rpc_count) - 1);
 848                 cfs_spin_lock(&export->exp_lock);
 849                 if (req->rq_export->exp_conn_cnt <
 850                     lustre_msg_get_conn_cnt(req->rq_reqmsg))
 851                         /* try to abort active requests */
 852                         req->rq_export->exp_abort_active_req = 1;
 853                 cfs_spin_unlock(&export->exp_lock);
 854                 GOTO(out, rc = -EBUSY);
 855         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
 856                 CERROR("%s: NID %s (%s) reconnected with 1 conn_cnt; "
 857                        "cookies not random?\n", target->obd_name,
 858                        libcfs_nid2str(req->rq_peer.nid), cluuid.uuid);
 859                 GOTO(out, rc = -EALREADY);
 860         } else {
 861                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
 862         }
 863
 864         if (rc < 0) {
 865                 GOTO(out, rc);
 866         }
 867
 868         CWARN("%s: connection from %s@%s %st"LPU64" exp %p cur %ld last %ld\n",
 869                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 870               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
 871               export, (long)cfs_time_current_sec(),
 872               export ? (long)export->exp_last_request_time : 0);
 873
 874         /* Tell the client if we're in recovery. */
 875         if (target->obd_recovering) {
 876                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 877                 /* If this is the first time a client connects,
 878                    reset the recovery timer */
 879                 if (rc == 0)
 880                         target_start_and_reset_recovery_timer(target, req,
 881                                                               !export);
 882         }
 883
 884         /* We want to handle EALREADY but *not* -EALREADY from
 885          * target_handle_reconnect(), return reconnection state in a flag */
 886         if (rc == EALREADY) {
 887                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 888                 rc = 0;
 889         } else {
 890                 LASSERT(rc == 0);
 891         }
 892
 893         /* Tell the client if we support replayable requests */
 894         if (target->obd_replayable)
 895                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 896         client_nid = &req->rq_peer.nid;
 897
 898         if (export == NULL) {
 899                 if (target->obd_recovering) {
 900                         cfs_time_t t;
 901
 902                         t = cfs_timer_deadline(&target->obd_recovery_timer);
 903                         t = cfs_time_sub(t, cfs_time_current());
 904                         CERROR("%s: denying connection for new client %s (%s): "
 905                                "%d clients in recovery for "CFS_TIME_T"s\n",
 906                                target->obd_name,
 907                                libcfs_nid2str(req->rq_peer.nid), cluuid.uuid,
 908                                cfs_atomic_read(&target-> \
 909                                                obd_lock_replay_clients),
 910                                cfs_duration_sec(t));
 911                         rc = -EBUSY;
 912                 } else {
 913 dont_check_exports:
 914                         rc = obd_connect(req->rq_svc_thread->t_env,
 915                                          &export, target, &cluuid, data,
 916                                          client_nid);
 917                         if (rc == 0)
 918                                 conn.cookie = export->exp_handle.h_cookie;
 919                 }
 920         } else {
 921                 rc = obd_reconnect(req->rq_svc_thread->t_env,
 922                                    export, target, &cluuid, data, client_nid);
 923                 if (rc == 0)
 924                         /* prevous done via class_conn2export */
 925                         class_export_get(export);
 926         }
 927         if (rc)
 928                 GOTO(out, rc);
 929         /* Return only the parts of obd_connect_data that we understand, so the
 930          * client knows that we don't understand the rest. */
 931         if (data) {
 932                  tmpdata = req_capsule_server_get(&req->rq_pill,
 933                                                   &RMF_CONNECT_DATA);
 934                   //data->ocd_connect_flags &= OBD_CONNECT_SUPPORTED;
 935                  *tmpdata = *data;
 936         }
 937
 938         /* If all else goes well, this is our RPC return code. */
 939         req->rq_status = 0;
 940
 941         lustre_msg_set_handle(req->rq_repmsg, &conn);
 942
 943         /* If the client and the server are the same node, we will already
 944          * have an export that really points to the client's DLM export,
 945          * because we have a shared handles table.
 946          *
 947          * XXX this will go away when shaver stops sending the "connect" handle
 948          * in the real "remote handle" field of the request --phik 24 Apr 2003
 949          */
 950         if (req->rq_export != NULL)
 951                 class_export_put(req->rq_export);
 952
 953         req->rq_export = export;
 954
 955         cfs_spin_lock(&export->exp_lock);
 956         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
 957                 cfs_spin_unlock(&export->exp_lock);
 958                 CERROR("%s: %s already connected at higher conn_cnt: %d > %d\n",
 959                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 960                        export->exp_conn_cnt,
 961                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
 962
 963                 GOTO(out, rc = -EALREADY);
 964         }
 965         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
 966         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
 967         export->exp_abort_active_req = 0;
 968
 969         /* request from liblustre?  Don't evict it for not pinging. */
 970         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 971                 export->exp_libclient = 1;
 972                 cfs_spin_unlock(&export->exp_lock);
 973
 974                 cfs_spin_lock(&target->obd_dev_lock);
 975                 cfs_list_del_init(&export->exp_obd_chain_timed);
 976                 cfs_spin_unlock(&target->obd_dev_lock);
 977         } else {
 978                 cfs_spin_unlock(&export->exp_lock);
 979         }
 980
 981         if (export->exp_connection != NULL) {
 982                 /* Check to see if connection came from another NID */
 983                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
 984                     !cfs_hlist_unhashed(&export->exp_nid_hash))
 985                         cfs_hash_del(export->exp_obd->obd_nid_hash,
 986                                      &export->exp_connection->c_peer.nid,
 987                                      &export->exp_nid_hash);
 988
 989                 ptlrpc_connection_put(export->exp_connection);
 990         }
 991
 992         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
 993                                                        req->rq_self,
 994                                                        &remote_uuid);
 995         if (cfs_hlist_unhashed(&export->exp_nid_hash)) {
 996                 cfs_hash_add(export->exp_obd->obd_nid_hash,
 997                              &export->exp_connection->c_peer.nid,
 998                              &export->exp_nid_hash);
 999         }
1000
1001         cfs_spin_lock(&target->obd_recovery_task_lock);
1002         if (target->obd_recovering && !export->exp_in_recovery) {
1003                 cfs_spin_lock(&export->exp_lock);
1004                 export->exp_in_recovery = 1;
1005                 export->exp_req_replay_needed = 1;
1006                 export->exp_lock_replay_needed = 1;
1007                 cfs_spin_unlock(&export->exp_lock);
1008                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
1009                      && (data->ocd_transno == 0))
1010                         CWARN("Connect with zero transno!\n");
1011
1012                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
1013                      && data->ocd_transno < target->obd_next_recovery_transno)
1014                         target->obd_next_recovery_transno = data->ocd_transno;
1015                 target->obd_connected_clients++;
1016                 cfs_atomic_inc(&target->obd_req_replay_clients);
1017                 cfs_atomic_inc(&target->obd_lock_replay_clients);
1018                 if (target->obd_connected_clients ==
1019                     target->obd_max_recoverable_clients)
1020                         cfs_waitq_signal(&target->obd_next_transno_waitq);
1021         }
1022         cfs_spin_unlock(&target->obd_recovery_task_lock);
1023         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1024         conn = *tmp;
1025
1026         if (export->exp_imp_reverse != NULL) {
1027                 /* destroyed import can be still referenced in ctxt */
1028                 obd_set_info_async(export, sizeof(KEY_REVIMP_UPD),
1029                                    KEY_REVIMP_UPD, 0, NULL, NULL);
1030
1031                 client_destroy_import(export->exp_imp_reverse);
1032         }
1033
1034         /* for the rest part, we return -ENOTCONN in case of errors
1035          * in order to let client initialize connection again.
1036          */
1037         revimp = export->exp_imp_reverse = class_new_import(target);
1038         if (!revimp) {
1039                 CERROR("fail to alloc new reverse import.\n");
1040                 GOTO(out, rc = -ENOTCONN);
1041         }
1042
1043         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
1044         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
1045         revimp->imp_remote_handle = conn;
1046         revimp->imp_dlm_fake = 1;
1047         revimp->imp_state = LUSTRE_IMP_FULL;
1048
1049         /* unknown versions will be caught in
1050          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
1051         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1052
1053         if ((export->exp_connect_flags & OBD_CONNECT_AT) &&
1054             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1055                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1056         else
1057                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1058
1059         if ((export->exp_connect_flags & OBD_CONNECT_FULL20) &&
1060             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1061                 revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
1062         else
1063                 revimp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
1064
1065         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
1066         if (rc) {
1067                 CERROR("Failed to get sec for reverse import: %d\n", rc);
1068                 export->exp_imp_reverse = NULL;
1069                 class_destroy_import(revimp);
1070         }
1071
1072         class_import_put(revimp);
1073 out:
1074         if (export) {
1075                 cfs_spin_lock(&export->exp_lock);
1076                 export->exp_connecting = 0;
1077                 cfs_spin_unlock(&export->exp_lock);
1078         }
1079         if (targref)
1080                 class_decref(targref, __FUNCTION__, cfs_current());
1081         if (rc)
1082                 req->rq_status = rc;
1083         RETURN(rc);
1084 }
1085
1086 int target_handle_disconnect(struct ptlrpc_request *req)
1087 {
1088         int rc;
1089         ENTRY;
1090
1091         rc = req_capsule_server_pack(&req->rq_pill);
1092         if (rc)
1093                 RETURN(rc);
1094
1095         /* keep the rq_export around so we can send the reply */
1096         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1097
1098         RETURN(0);
1099 }
1100
1101 void target_destroy_export(struct obd_export *exp)
1102 {
1103         /* exports created from last_rcvd data, and "fake"
1104            exports created by lctl don't have an import */
1105         if (exp->exp_imp_reverse != NULL)
1106                 client_destroy_import(exp->exp_imp_reverse);
1107
1108         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1109         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1110         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1111         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1112 }
1113
1114 /*
1115  * Recovery functions
1116  */
1117 static void target_request_copy_get(struct ptlrpc_request *req)
1118 {
1119         class_export_rpc_get(req->rq_export);
1120         LASSERT(cfs_list_empty(&req->rq_list));
1121         CFS_INIT_LIST_HEAD(&req->rq_replay_list);
1122
1123         /* increase refcount to keep request in queue */
1124         cfs_atomic_inc(&req->rq_refcount);
1125         /** let export know it has replays to be handled */
1126         cfs_atomic_inc(&req->rq_export->exp_replay_count);
1127         /* release service thread while request is queued
1128          * we are moving the request from active processing
1129          * to waiting on the replay queue */
1130         ptlrpc_server_active_request_dec(req);
1131 }
1132
1133 static void target_request_copy_put(struct ptlrpc_request *req)
1134 {
1135         LASSERT(cfs_list_empty(&req->rq_replay_list));
1136         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1137
1138         cfs_atomic_dec(&req->rq_export->exp_replay_count);
1139         class_export_rpc_put(req->rq_export);
1140         /* ptlrpc_server_drop_request() assumes the request is active */
1141         ptlrpc_server_active_request_inc(req);
1142         ptlrpc_server_drop_request(req);
1143 }
1144
1145 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1146 {
1147         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1148         struct obd_export     *exp = req->rq_export;
1149         struct ptlrpc_request *reqiter;
1150         int                    dup = 0;
1151
1152         LASSERT(exp);
1153
1154         cfs_spin_lock(&exp->exp_lock);
1155         cfs_list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1156                                 rq_replay_list) {
1157                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1158                         dup = 1;
1159                         break;
1160                 }
1161         }
1162
1163         if (dup) {
1164                 /* we expect it with RESENT and REPLAY flags */
1165                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1166                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1167                         CERROR("invalid flags %x of resent replay\n",
1168                                lustre_msg_get_flags(req->rq_reqmsg));
1169         } else {
1170                 cfs_list_add_tail(&req->rq_replay_list,
1171                                   &exp->exp_req_replay_queue);
1172         }
1173
1174         cfs_spin_unlock(&exp->exp_lock);
1175         return dup;
1176 }
1177
1178 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1179 {
1180         LASSERT(!cfs_list_empty(&req->rq_replay_list));
1181         LASSERT(req->rq_export);
1182
1183         cfs_spin_lock(&req->rq_export->exp_lock);
1184         cfs_list_del_init(&req->rq_replay_list);
1185         cfs_spin_unlock(&req->rq_export->exp_lock);
1186 }
1187
1188 #ifdef __KERNEL__
1189 static void target_finish_recovery(struct obd_device *obd)
1190 {
1191         ENTRY;
1192         LCONSOLE_INFO("%s: sending delayed replies to recovered clients\n",
1193                       obd->obd_name);
1194
1195         ldlm_reprocess_all_ns(obd->obd_namespace);
1196         cfs_spin_lock(&obd->obd_recovery_task_lock);
1197         if (!cfs_list_empty(&obd->obd_req_replay_queue) ||
1198             !cfs_list_empty(&obd->obd_lock_replay_queue) ||
1199             !cfs_list_empty(&obd->obd_final_req_queue)) {
1200                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1201                        obd->obd_name,
1202                        cfs_list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1203                        cfs_list_empty(&obd->obd_lock_replay_queue) ? \
1204                                "" : "lock ",
1205                        cfs_list_empty(&obd->obd_final_req_queue) ? \
1206                                "" : "final ");
1207                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1208                 LBUG();
1209         }
1210         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1211
1212         obd->obd_recovery_end = cfs_time_current_sec();
1213
1214         /* when recovery finished, cleanup orphans on mds and ost */
1215         if (OBT(obd) && OBP(obd, postrecov)) {
1216                 int rc = OBP(obd, postrecov)(obd);
1217                 if (rc < 0)
1218                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1219                                       obd->obd_name, rc);
1220         }
1221         EXIT;
1222 }
1223
1224 static void abort_req_replay_queue(struct obd_device *obd)
1225 {
1226         struct ptlrpc_request *req, *n;
1227         cfs_list_t abort_list;
1228
1229         CFS_INIT_LIST_HEAD(&abort_list);
1230         cfs_spin_lock(&obd->obd_recovery_task_lock);
1231         cfs_list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1232         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1233         cfs_list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1234                 DEBUG_REQ(D_WARNING, req, "aborted:");
1235                 req->rq_status = -ENOTCONN;
1236                 if (ptlrpc_error(req)) {
1237                         DEBUG_REQ(D_ERROR, req,
1238                                   "failed abort_req_reply; skipping");
1239                 }
1240                 target_exp_dequeue_req_replay(req);
1241                 target_request_copy_put(req);
1242         }
1243 }
1244
1245 static void abort_lock_replay_queue(struct obd_device *obd)
1246 {
1247         struct ptlrpc_request *req, *n;
1248         cfs_list_t abort_list;
1249
1250         CFS_INIT_LIST_HEAD(&abort_list);
1251         cfs_spin_lock(&obd->obd_recovery_task_lock);
1252         cfs_list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1253         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1254         cfs_list_for_each_entry_safe(req, n, &abort_list, rq_list){
1255                 DEBUG_REQ(D_ERROR, req, "aborted:");
1256                 req->rq_status = -ENOTCONN;
1257                 if (ptlrpc_error(req)) {
1258                         DEBUG_REQ(D_ERROR, req,
1259                                   "failed abort_lock_reply; skipping");
1260                 }
1261                 target_request_copy_put(req);
1262         }
1263 }
1264 #endif
1265
1266 /* Called from a cleanup function if the device is being cleaned up
1267    forcefully.  The exports should all have been disconnected already,
1268    the only thing left to do is
1269      - clear the recovery flags
1270      - cancel the timer
1271      - free queued requests and replies, but don't send replies
1272    Because the obd_stopping flag is set, no new requests should be received.
1273
1274 */
1275 void target_cleanup_recovery(struct obd_device *obd)
1276 {
1277         struct ptlrpc_request *req, *n;
1278         cfs_list_t clean_list;
1279         ENTRY;
1280
1281         CFS_INIT_LIST_HEAD(&clean_list);
1282         cfs_spin_lock(&obd->obd_dev_lock);
1283         if (!obd->obd_recovering) {
1284                 cfs_spin_unlock(&obd->obd_dev_lock);
1285                 EXIT;
1286                 return;
1287         }
1288         obd->obd_recovering = obd->obd_abort_recovery = 0;
1289         cfs_spin_unlock(&obd->obd_dev_lock);
1290
1291         cfs_spin_lock(&obd->obd_recovery_task_lock);
1292         target_cancel_recovery_timer(obd);
1293         cfs_list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1294         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1295
1296         cfs_list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1297                 LASSERT(req->rq_reply_state == 0);
1298                 target_exp_dequeue_req_replay(req);
1299                 target_request_copy_put(req);
1300         }
1301
1302         cfs_spin_lock(&obd->obd_recovery_task_lock);
1303         cfs_list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1304         cfs_list_splice_init(&obd->obd_final_req_queue, &clean_list);
1305         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1306
1307         cfs_list_for_each_entry_safe(req, n, &clean_list, rq_list){
1308                 LASSERT(req->rq_reply_state == 0);
1309                 target_request_copy_put(req);
1310         }
1311
1312         EXIT;
1313 }
1314
1315 /* obd_recovery_task_lock should be held */
1316 void target_cancel_recovery_timer(struct obd_device *obd)
1317 {
1318         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1319         cfs_timer_disarm(&obd->obd_recovery_timer);
1320 }
1321
1322 /* extend = 1 means require at least "duration" seconds left in the timer,
1323    extend = 0 means set the total duration (start_recovery_timer) */
1324 static void reset_recovery_timer(struct obd_device *obd, int duration,
1325                                  int extend)
1326 {
1327         cfs_time_t now = cfs_time_current_sec();
1328         cfs_duration_t left;
1329
1330         cfs_spin_lock(&obd->obd_recovery_task_lock);
1331         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1332                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1333                 return;
1334         }
1335
1336         left = cfs_time_sub(obd->obd_recovery_end, now);
1337
1338         if (extend && (duration > left))
1339                 obd->obd_recovery_timeout += duration - left;
1340         else if (!extend && (duration > obd->obd_recovery_timeout))
1341                 /* Track the client's largest expected replay time */
1342                 obd->obd_recovery_timeout = duration;
1343
1344         /* Hard limit of obd_recovery_time_hard which should not happen */
1345         if (obd->obd_recovery_timeout > obd->obd_recovery_time_hard)
1346                 obd->obd_recovery_timeout = obd->obd_recovery_time_hard;
1347
1348         obd->obd_recovery_end = obd->obd_recovery_start +
1349                                 obd->obd_recovery_timeout;
1350         if (!cfs_timer_is_armed(&obd->obd_recovery_timer) ||
1351             cfs_time_before(now, obd->obd_recovery_end)) {
1352                 left = cfs_time_sub(obd->obd_recovery_end, now);
1353                 cfs_timer_arm(&obd->obd_recovery_timer, cfs_time_shift(left));
1354         }
1355         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1356         CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
1357                obd->obd_name, (unsigned)left);
1358 }
1359
1360 static void check_and_start_recovery_timer(struct obd_device *obd)
1361 {
1362         cfs_spin_lock(&obd->obd_recovery_task_lock);
1363         if (cfs_timer_is_armed(&obd->obd_recovery_timer)) {
1364                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1365                 return;
1366         }
1367         CDEBUG(D_HA, "%s: starting recovery timer\n", obd->obd_name);
1368         obd->obd_recovery_start = cfs_time_current_sec();
1369         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1370
1371         reset_recovery_timer(obd, obd->obd_recovery_timeout, 0);
1372 }
1373
1374 /* Reset the timer with each new client connection */
1375 /*
1376  * This timer is actually reconnect_timer, which is for making sure
1377  * the total recovery window is at least as big as my reconnect
1378  * attempt timing. So the initial recovery time_out will be set to
1379  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1380  * from client is bigger than this, then the recovery time_out will
1381  * be extended to make sure the client could be reconnected, in the
1382  * process, the timeout from the new client should be ignored.
1383  */
1384
1385 static void
1386 target_start_and_reset_recovery_timer(struct obd_device *obd,
1387                                       struct ptlrpc_request *req,
1388                                       int new_client)
1389 {
1390         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1391
1392         if (!new_client && service_time)
1393                 /* Teach server about old server's estimates, as first guess
1394                  * at how long new requests will take. */
1395                 at_measured(&req->rq_rqbd->rqbd_service->srv_at_estimate,
1396                             service_time);
1397
1398         check_and_start_recovery_timer(obd);
1399
1400         /* convert the service time to rpc timeout,
1401          * reuse service_time to limit stack usage */
1402         service_time = at_est2timeout(service_time);
1403
1404         /* We expect other clients to timeout within service_time, then try
1405          * to reconnect, then try the failover server.  The max delay between
1406          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL */
1407         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC +
1408                              INITIAL_CONNECT_TIMEOUT);
1409         if (service_time > obd->obd_recovery_timeout && !new_client)
1410                 reset_recovery_timer(obd, service_time, 0);
1411 }
1412
1413 #ifdef __KERNEL__
1414
1415 /** Health checking routines */
1416 static inline int exp_connect_healthy(struct obd_export *exp)
1417 {
1418         return (exp->exp_in_recovery);
1419 }
1420
1421 /** if export done req_replay or has replay in queue */
1422 static inline int exp_req_replay_healthy(struct obd_export *exp)
1423 {
1424         return (!exp->exp_req_replay_needed ||
1425                 cfs_atomic_read(&exp->exp_replay_count) > 0);
1426 }
1427 /** if export done lock_replay or has replay in queue */
1428 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1429 {
1430         return (!exp->exp_lock_replay_needed ||
1431                 cfs_atomic_read(&exp->exp_replay_count) > 0);
1432 }
1433
1434 static inline int exp_vbr_healthy(struct obd_export *exp)
1435 {
1436         return (!exp->exp_vbr_failed);
1437 }
1438
1439 static inline int exp_finished(struct obd_export *exp)
1440 {
1441         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1442 }
1443
1444 /** Checking routines for recovery */
1445 static int check_for_clients(struct obd_device *obd)
1446 {
1447         if (obd->obd_abort_recovery || obd->obd_recovery_expired)
1448                 return 1;
1449         LASSERT(obd->obd_connected_clients <= obd->obd_max_recoverable_clients);
1450         if (obd->obd_no_conn == 0 &&
1451             obd->obd_connected_clients + obd->obd_stale_clients ==
1452             obd->obd_max_recoverable_clients)
1453                 return 1;
1454         return 0;
1455 }
1456
1457 static int check_for_next_transno(struct obd_device *obd)
1458 {
1459         struct ptlrpc_request *req = NULL;
1460         int wake_up = 0, connected, completed, queue_len;
1461         __u64 next_transno, req_transno;
1462         ENTRY;
1463
1464         cfs_spin_lock(&obd->obd_recovery_task_lock);
1465         if (!cfs_list_empty(&obd->obd_req_replay_queue)) {
1466                 req = cfs_list_entry(obd->obd_req_replay_queue.next,
1467                                      struct ptlrpc_request, rq_list);
1468                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1469         } else {
1470                 req_transno = 0;
1471         }
1472
1473         connected = obd->obd_connected_clients;
1474         completed = connected - cfs_atomic_read(&obd->obd_req_replay_clients);
1475         queue_len = obd->obd_requests_queued_for_recovery;
1476         next_transno = obd->obd_next_recovery_transno;
1477
1478         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1479                "req_transno: "LPU64", next_transno: "LPU64"\n",
1480                obd->obd_max_recoverable_clients, connected, completed,
1481                queue_len, req_transno, next_transno);
1482
1483         if (obd->obd_abort_recovery) {
1484                 CDEBUG(D_HA, "waking for aborted recovery\n");
1485                 wake_up = 1;
1486         } else if (obd->obd_recovery_expired) {
1487                 CDEBUG(D_HA, "waking for expired recovery\n");
1488                 wake_up = 1;
1489         } else if (cfs_atomic_read(&obd->obd_req_replay_clients) == 0) {
1490                 CDEBUG(D_HA, "waking for completed recovery\n");
1491                 wake_up = 1;
1492         } else if (req_transno == next_transno) {
1493                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1494                 wake_up = 1;
1495         } else if (queue_len == cfs_atomic_read(&obd->obd_req_replay_clients)) {
1496                 int d_lvl = D_HA;
1497                 /** handle gaps occured due to lost reply or VBR */
1498                 LASSERTF(req_transno >= next_transno,
1499                          "req_transno: "LPU64", next_transno: "LPU64"\n",
1500                          req_transno, next_transno);
1501                 if (req_transno > obd->obd_last_committed &&
1502                     !obd->obd_version_recov)
1503                         d_lvl = D_ERROR;
1504                 CDEBUG(d_lvl,
1505                        "%s: waking for gap in transno, VBR is %s (skip: "
1506                        LPD64", ql: %d, comp: %d, conn: %d, next: "LPD64
1507                        ", last_committed: "LPD64")\n",
1508                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1509                        next_transno, queue_len, completed, connected,
1510                        req_transno, obd->obd_last_committed);
1511                 obd->obd_next_recovery_transno = req_transno;
1512                 wake_up = 1;
1513         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1514                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1515                        " by fail_lock, waking up ("LPD64")\n", next_transno);
1516                 obd->obd_next_recovery_transno = req_transno;
1517                 wake_up = 1;
1518         }
1519         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1520         return wake_up;
1521 }
1522
1523 static int check_for_next_lock(struct obd_device *obd)
1524 {
1525         int wake_up = 0;
1526
1527         cfs_spin_lock(&obd->obd_recovery_task_lock);
1528         if (!cfs_list_empty(&obd->obd_lock_replay_queue)) {
1529                 CDEBUG(D_HA, "waking for next lock\n");
1530                 wake_up = 1;
1531         } else if (cfs_atomic_read(&obd->obd_lock_replay_clients) == 0) {
1532                 CDEBUG(D_HA, "waking for completed lock replay\n");
1533                 wake_up = 1;
1534         } else if (obd->obd_abort_recovery) {
1535                 CDEBUG(D_HA, "waking for aborted recovery\n");
1536                 wake_up = 1;
1537         } else if (obd->obd_recovery_expired) {
1538                 CDEBUG(D_HA, "waking for expired recovery\n");
1539                 wake_up = 1;
1540         }
1541         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1542
1543         return wake_up;
1544 }
1545
1546 /**
1547  * wait for recovery events,
1548  * check its status with help of check_routine
1549  * evict dead clients via health_check
1550  */
1551 static int target_recovery_overseer(struct obd_device *obd,
1552                                     int (*check_routine)(struct obd_device *),
1553                                     int (*health_check)(struct obd_export *))
1554 {
1555 repeat:
1556         cfs_wait_event(obd->obd_next_transno_waitq, check_routine(obd));
1557         if (obd->obd_abort_recovery) {
1558                 CWARN("recovery is aborted, evict exports in recovery\n");
1559                 /** evict exports which didn't finish recovery yet */
1560                 class_disconnect_stale_exports(obd, exp_finished);
1561                 return 1;
1562         } else if (obd->obd_recovery_expired) {
1563                 obd->obd_recovery_expired = 0;
1564                 /** If some clients died being recovered, evict them */
1565                 CDEBUG(D_WARNING,
1566                        "recovery is timed out, evict stale exports\n");
1567                 /** evict cexports with no replay in queue, they are stalled */
1568                 class_disconnect_stale_exports(obd, health_check);
1569                 /** continue with VBR */
1570                 cfs_spin_lock(&obd->obd_dev_lock);
1571                 obd->obd_version_recov = 1;
1572                 cfs_spin_unlock(&obd->obd_dev_lock);
1573                 /**
1574                  * reset timer, recovery will proceed with versions now,
1575                  * timeout is set just to handle reconnection delays
1576                  */
1577                 reset_recovery_timer(obd, RECONNECT_DELAY_MAX, 1);
1578                 /** Wait for recovery events again, after evicting bad clients */
1579                 goto repeat;
1580         }
1581         return 0;
1582 }
1583
1584 static struct ptlrpc_request *target_next_replay_req(struct obd_device *obd)
1585 {
1586         struct ptlrpc_request *req = NULL;
1587         ENTRY;
1588
1589         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1590                obd->obd_next_recovery_transno);
1591
1592         if (target_recovery_overseer(obd, check_for_next_transno,
1593                                      exp_req_replay_healthy)) {
1594                 abort_req_replay_queue(obd);
1595                 abort_lock_replay_queue(obd);
1596         }
1597
1598         cfs_spin_lock(&obd->obd_recovery_task_lock);
1599         if (!cfs_list_empty(&obd->obd_req_replay_queue)) {
1600                 req = cfs_list_entry(obd->obd_req_replay_queue.next,
1601                                      struct ptlrpc_request, rq_list);
1602                 cfs_list_del_init(&req->rq_list);
1603                 obd->obd_requests_queued_for_recovery--;
1604                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1605         } else {
1606                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1607                 LASSERT(cfs_list_empty(&obd->obd_req_replay_queue));
1608                 LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients) == 0);
1609                 /** evict exports failed VBR */
1610                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1611         }
1612         RETURN(req);
1613 }
1614
1615 static struct ptlrpc_request *target_next_replay_lock(struct obd_device *obd)
1616 {
1617         struct ptlrpc_request *req = NULL;
1618
1619         CDEBUG(D_HA, "Waiting for lock\n");
1620         if (target_recovery_overseer(obd, check_for_next_lock,
1621                                      exp_lock_replay_healthy))
1622                 abort_lock_replay_queue(obd);
1623
1624         cfs_spin_lock(&obd->obd_recovery_task_lock);
1625         if (!cfs_list_empty(&obd->obd_lock_replay_queue)) {
1626                 req = cfs_list_entry(obd->obd_lock_replay_queue.next,
1627                                      struct ptlrpc_request, rq_list);
1628                 cfs_list_del_init(&req->rq_list);
1629                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1630         } else {
1631                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1632                 LASSERT(cfs_list_empty(&obd->obd_lock_replay_queue));
1633                 LASSERT(cfs_atomic_read(&obd->obd_lock_replay_clients) == 0);
1634                 /** evict exports failed VBR */
1635                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1636         }
1637         return req;
1638 }
1639
1640 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
1641 {
1642         struct ptlrpc_request *req = NULL;
1643
1644         cfs_spin_lock(&obd->obd_recovery_task_lock);
1645         if (!cfs_list_empty(&obd->obd_final_req_queue)) {
1646                 req = cfs_list_entry(obd->obd_final_req_queue.next,
1647                                      struct ptlrpc_request, rq_list);
1648                 cfs_list_del_init(&req->rq_list);
1649                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1650                 if (req->rq_export->exp_in_recovery) {
1651                         cfs_spin_lock(&req->rq_export->exp_lock);
1652                         req->rq_export->exp_in_recovery = 0;
1653                         cfs_spin_unlock(&req->rq_export->exp_lock);
1654                 }
1655         } else {
1656                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1657         }
1658         return req;
1659 }
1660
1661 static int handle_recovery_req(struct ptlrpc_thread *thread,
1662                                struct ptlrpc_request *req,
1663                                svc_handler_t handler)
1664 {
1665         int rc;
1666         ENTRY;
1667
1668         /**
1669          * export can be evicted during recovery, no need to handle replays for
1670          * it after that, discard such request silently
1671          */
1672         if (req->rq_export->exp_disconnected)
1673                 GOTO(reqcopy_put, rc = 0);
1674
1675         rc = lu_context_init(&req->rq_recov_session, LCT_SESSION);
1676         if (rc) {
1677                 CERROR("Failure to initialize session: %d\n", rc);
1678                 GOTO(reqcopy_put, rc);
1679         }
1680
1681         req->rq_recov_session.lc_thread = thread;
1682         lu_context_enter(&req->rq_recov_session);
1683         req->rq_svc_thread = thread;
1684         req->rq_svc_thread->t_env->le_ses = &req->rq_recov_session;
1685
1686         /* thread context */
1687         lu_context_enter(&thread->t_env->le_ctx);
1688         (void)handler(req);
1689         lu_context_exit(&thread->t_env->le_ctx);
1690
1691         lu_context_exit(&req->rq_recov_session);
1692         lu_context_fini(&req->rq_recov_session);
1693         /* don't reset timer for final stage */
1694         if (!exp_finished(req->rq_export)) {
1695                 /**
1696                  * Add request timeout to the recovery time so next request from
1697                  * this client may come in recovery time
1698                  */
1699                  reset_recovery_timer(class_exp2obd(req->rq_export),
1700                                       AT_OFF ? obd_timeout :
1701                                       lustre_msg_get_timeout(req->rq_reqmsg), 1);
1702         }
1703 reqcopy_put:
1704         RETURN(rc);
1705 }
1706
1707 static int target_recovery_thread(void *arg)
1708 {
1709         struct lu_target *lut = arg;
1710         struct obd_device *obd = lut->lut_obd;
1711         struct ptlrpc_request *req;
1712         struct target_recovery_data *trd = &obd->obd_recovery_data;
1713         unsigned long delta;
1714         unsigned long flags;
1715         struct lu_env env;
1716         struct ptlrpc_thread fake_svc_thread, *thread = &fake_svc_thread;
1717         int rc = 0;
1718         ENTRY;
1719
1720         cfs_daemonize_ctxt("tgt_recov");
1721
1722         SIGNAL_MASK_LOCK(current, flags);
1723         sigfillset(&current->blocked);
1724         RECALC_SIGPENDING;
1725         SIGNAL_MASK_UNLOCK(current, flags);
1726
1727         rc = lu_context_init(&env.le_ctx, LCT_MD_THREAD);
1728         if (rc)
1729                 RETURN(rc);
1730
1731         thread->t_env = &env;
1732         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
1733         env.le_ctx.lc_thread = thread;
1734         thread->t_data = NULL;
1735
1736         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
1737                cfs_curproc_pid());
1738         trd->trd_processing_task = cfs_curproc_pid();
1739
1740         cfs_spin_lock(&obd->obd_dev_lock);
1741         obd->obd_recovering = 1;
1742         cfs_spin_unlock(&obd->obd_dev_lock);
1743         cfs_complete(&trd->trd_starting);
1744
1745         /* first of all, we have to know the first transno to replay */
1746         if (target_recovery_overseer(obd, check_for_clients,
1747                                      exp_connect_healthy)) {
1748                 abort_req_replay_queue(obd);
1749                 abort_lock_replay_queue(obd);
1750         }
1751
1752         /* next stage: replay requests */
1753         delta = jiffies;
1754         CDEBUG(D_INFO, "1: request replay stage - %d clients from t"LPU64"\n",
1755                cfs_atomic_read(&obd->obd_req_replay_clients),
1756                obd->obd_next_recovery_transno);
1757         while ((req = target_next_replay_req(obd))) {
1758                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1759                 DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s",
1760                           lustre_msg_get_transno(req->rq_reqmsg),
1761                           libcfs_nid2str(req->rq_peer.nid));
1762                 handle_recovery_req(thread, req,
1763                                     trd->trd_recovery_handler);
1764                 /**
1765                  * bz18031: increase next_recovery_transno before
1766                  * target_request_copy_put() will drop exp_rpc reference
1767                  */
1768                 cfs_spin_lock(&obd->obd_recovery_task_lock);
1769                 obd->obd_next_recovery_transno++;
1770                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1771                 target_exp_dequeue_req_replay(req);
1772                 target_request_copy_put(req);
1773                 obd->obd_replayed_requests++;
1774         }
1775
1776         /**
1777          * The second stage: replay locks
1778          */
1779         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
1780                cfs_atomic_read(&obd->obd_lock_replay_clients));
1781         while ((req = target_next_replay_lock(obd))) {
1782                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1783                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
1784                           libcfs_nid2str(req->rq_peer.nid));
1785                 handle_recovery_req(thread, req,
1786                                     trd->trd_recovery_handler);
1787                 target_request_copy_put(req);
1788                 obd->obd_replayed_locks++;
1789         }
1790
1791         /**
1792          * The third stage: reply on final pings, at this moment all clients
1793          * must have request in final queue
1794          */
1795         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
1796         /** Update server last boot epoch */
1797         lut_boot_epoch_update(lut);
1798         /* We drop recoverying flag to forward all new requests
1799          * to regular mds_handle() since now */
1800         cfs_spin_lock(&obd->obd_dev_lock);
1801         obd->obd_recovering = obd->obd_abort_recovery = 0;
1802         cfs_spin_unlock(&obd->obd_dev_lock);
1803         cfs_spin_lock(&obd->obd_recovery_task_lock);
1804         target_cancel_recovery_timer(obd);
1805         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1806         while ((req = target_next_final_ping(obd))) {
1807                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1808                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
1809                           libcfs_nid2str(req->rq_peer.nid));
1810                 handle_recovery_req(thread, req,
1811                                     trd->trd_recovery_handler);
1812                 target_request_copy_put(req);
1813         }
1814
1815         delta = (jiffies - delta) / CFS_HZ;
1816         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
1817               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
1818         if (delta > OBD_RECOVERY_TIME_SOFT) {
1819                 CWARN("too long recovery - read logs\n");
1820                 libcfs_debug_dumplog();
1821         }
1822
1823         target_finish_recovery(obd);
1824
1825         lu_context_fini(&env.le_ctx);
1826         trd->trd_processing_task = 0;
1827         cfs_complete(&trd->trd_finishing);
1828         RETURN(rc);
1829 }
1830
1831 static int target_start_recovery_thread(struct lu_target *lut,
1832                                         svc_handler_t handler)
1833 {
1834         struct obd_device *obd = lut->lut_obd;
1835         int rc = 0;
1836         struct target_recovery_data *trd = &obd->obd_recovery_data;
1837
1838         memset(trd, 0, sizeof(*trd));
1839         cfs_init_completion(&trd->trd_starting);
1840         cfs_init_completion(&trd->trd_finishing);
1841         trd->trd_recovery_handler = handler;
1842
1843         if (cfs_kernel_thread(target_recovery_thread, lut, 0) > 0) {
1844                 cfs_wait_for_completion(&trd->trd_starting);
1845                 LASSERT(obd->obd_recovering != 0);
1846         } else
1847                 rc = -ECHILD;
1848
1849         return rc;
1850 }
1851
1852 void target_stop_recovery_thread(struct obd_device *obd)
1853 {
1854         if (obd->obd_recovery_data.trd_processing_task > 0) {
1855                 struct target_recovery_data *trd = &obd->obd_recovery_data;
1856                 /** recovery can be done but postrecovery is not yet */
1857                 cfs_spin_lock(&obd->obd_dev_lock);
1858                 if (obd->obd_recovering) {
1859                         CERROR("%s: Aborting recovery\n", obd->obd_name);
1860                         obd->obd_abort_recovery = 1;
1861                         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1862                 }
1863                 cfs_spin_unlock(&obd->obd_dev_lock);
1864                 cfs_wait_for_completion(&trd->trd_finishing);
1865         }
1866 }
1867
1868 void target_recovery_fini(struct obd_device *obd)
1869 {
1870         class_disconnect_exports(obd);
1871         target_stop_recovery_thread(obd);
1872         target_cleanup_recovery(obd);
1873 }
1874 EXPORT_SYMBOL(target_recovery_fini);
1875
1876 static void target_recovery_expired(unsigned long castmeharder)
1877 {
1878         struct obd_device *obd = (struct obd_device *)castmeharder;
1879         CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
1880                " after %lds (%d clients connected)\n",
1881                obd->obd_name, cfs_atomic_read(&obd->obd_lock_replay_clients),
1882                cfs_time_current_sec()- obd->obd_recovery_start,
1883                obd->obd_connected_clients);
1884
1885         obd->obd_recovery_expired = 1;
1886         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1887 }
1888
1889 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
1890 {
1891         struct obd_device *obd = lut->lut_obd;
1892         if (obd->obd_max_recoverable_clients == 0) {
1893                 /** Update server last boot epoch */
1894                 lut_boot_epoch_update(lut);
1895                 return;
1896         }
1897
1898         CWARN("RECOVERY: service %s, %d recoverable clients, "
1899               "last_transno "LPU64"\n", obd->obd_name,
1900               obd->obd_max_recoverable_clients, obd->obd_last_committed);
1901         LASSERT(obd->obd_stopping == 0);
1902         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
1903         obd->obd_recovery_start = 0;
1904         obd->obd_recovery_end = 0;
1905
1906         /* both values can be get from mount data already */
1907         if (obd->obd_recovery_timeout == 0)
1908                 obd->obd_recovery_timeout = OBD_RECOVERY_TIME_SOFT;
1909         if (obd->obd_recovery_time_hard == 0)
1910                 obd->obd_recovery_time_hard = OBD_RECOVERY_TIME_HARD;
1911         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
1912         target_start_recovery_thread(lut, handler);
1913 }
1914 EXPORT_SYMBOL(target_recovery_init);
1915
1916 #endif
1917
1918 static int target_process_req_flags(struct obd_device *obd,
1919                                     struct ptlrpc_request *req)
1920 {
1921         struct obd_export *exp = req->rq_export;
1922         LASSERT(exp != NULL);
1923         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1924                 /* client declares he's ready to replay locks */
1925                 cfs_spin_lock(&exp->exp_lock);
1926                 if (exp->exp_req_replay_needed) {
1927                         exp->exp_req_replay_needed = 0;
1928                         cfs_spin_unlock(&exp->exp_lock);
1929
1930                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
1931                         cfs_atomic_dec(&obd->obd_req_replay_clients);
1932                 } else {
1933                         cfs_spin_unlock(&exp->exp_lock);
1934                 }
1935         }
1936         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1937                 /* client declares he's ready to complete recovery
1938                  * so, we put the request on th final queue */
1939                 cfs_spin_lock(&exp->exp_lock);
1940                 if (exp->exp_lock_replay_needed) {
1941                         exp->exp_lock_replay_needed = 0;
1942                         cfs_spin_unlock(&exp->exp_lock);
1943
1944                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
1945                         cfs_atomic_dec(&obd->obd_lock_replay_clients);
1946                 } else {
1947                         cfs_spin_unlock(&exp->exp_lock);
1948                 }
1949         }
1950         return 0;
1951 }
1952
1953 int target_queue_recovery_request(struct ptlrpc_request *req,
1954                                   struct obd_device *obd)
1955 {
1956         cfs_list_t *tmp;
1957         int inserted = 0;
1958         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1959         ENTRY;
1960
1961         if (obd->obd_recovery_data.trd_processing_task == cfs_curproc_pid()) {
1962                 /* Processing the queue right now, don't re-add. */
1963                 RETURN(1);
1964         }
1965
1966         target_process_req_flags(obd, req);
1967
1968         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1969                 /* client declares he's ready to complete recovery
1970                  * so, we put the request on th final queue */
1971                 target_request_copy_get(req);
1972                 DEBUG_REQ(D_HA, req, "queue final req");
1973                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1974                 cfs_spin_lock(&obd->obd_recovery_task_lock);
1975                 if (obd->obd_recovering) {
1976                         cfs_list_add_tail(&req->rq_list,
1977                                           &obd->obd_final_req_queue);
1978                 } else {
1979                         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1980                         target_request_copy_put(req);
1981                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
1982                 }
1983                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1984                 RETURN(0);
1985         }
1986         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1987                 /* client declares he's ready to replay locks */
1988                 target_request_copy_get(req);
1989                 DEBUG_REQ(D_HA, req, "queue lock replay req");
1990                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1991                 cfs_spin_lock(&obd->obd_recovery_task_lock);
1992                 LASSERT(obd->obd_recovering);
1993                 /* usually due to recovery abort */
1994                 if (!req->rq_export->exp_in_recovery) {
1995                         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1996                         target_request_copy_put(req);
1997                         RETURN(-ENOTCONN);
1998                 }
1999                 LASSERT(req->rq_export->exp_lock_replay_needed);
2000                 cfs_list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
2001                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
2002                 RETURN(0);
2003         }
2004
2005         /* CAVEAT EMPTOR: The incoming request message has been swabbed
2006          * (i.e. buflens etc are in my own byte order), but type-dependent
2007          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
2008
2009         if (!transno) {
2010                 CFS_INIT_LIST_HEAD(&req->rq_list);
2011                 DEBUG_REQ(D_HA, req, "not queueing");
2012                 RETURN(1);
2013         }
2014
2015         /* If we're processing the queue, we want don't want to queue this
2016          * message.
2017          *
2018          * Also, if this request has a transno less than the one we're waiting
2019          * for, we should process it now.  It could (and currently always will)
2020          * be an open request for a descriptor that was opened some time ago.
2021          *
2022          * Also, a resent, replayed request that has already been
2023          * handled will pass through here and be processed immediately.
2024          */
2025         CWARN("Next recovery transno: "LPU64", current: "LPU64", replaying\n",
2026               obd->obd_next_recovery_transno, transno);
2027         cfs_spin_lock(&obd->obd_recovery_task_lock);
2028         if (transno < obd->obd_next_recovery_transno) {
2029                 /* Processing the queue right now, don't re-add. */
2030                 LASSERT(cfs_list_empty(&req->rq_list));
2031                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
2032                 RETURN(1);
2033         }
2034         cfs_spin_unlock(&obd->obd_recovery_task_lock);
2035
2036         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2037                 RETURN(0);
2038
2039         target_request_copy_get(req);
2040         if (!req->rq_export->exp_in_recovery) {
2041                 target_request_copy_put(req);
2042                 RETURN(-ENOTCONN);
2043         }
2044         LASSERT(req->rq_export->exp_req_replay_needed);
2045
2046         if (target_exp_enqueue_req_replay(req)) {
2047                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2048                 target_request_copy_put(req);
2049                 RETURN(0);
2050         }
2051
2052         /* XXX O(n^2) */
2053         cfs_spin_lock(&obd->obd_recovery_task_lock);
2054         LASSERT(obd->obd_recovering);
2055         cfs_list_for_each(tmp, &obd->obd_req_replay_queue) {
2056                 struct ptlrpc_request *reqiter =
2057                         cfs_list_entry(tmp, struct ptlrpc_request, rq_list);
2058
2059                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2060                         cfs_list_add_tail(&req->rq_list, &reqiter->rq_list);
2061                         inserted = 1;
2062                         break;
2063                 }
2064
2065                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2066                              transno)) {
2067                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2068                                   "has been claimed by another client");
2069                         cfs_spin_unlock(&obd->obd_recovery_task_lock);
2070                         target_exp_dequeue_req_replay(req);
2071                         target_request_copy_put(req);
2072                         RETURN(0);
2073                 }
2074         }
2075
2076         if (!inserted)
2077                 cfs_list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2078
2079         obd->obd_requests_queued_for_recovery++;
2080         cfs_spin_unlock(&obd->obd_recovery_task_lock);
2081         cfs_waitq_signal(&obd->obd_next_transno_waitq);
2082         RETURN(0);
2083 }
2084
2085 /**
2086  * Packs current SLV and Limit into \a req.
2087  */
2088 int target_pack_pool_reply(struct ptlrpc_request *req)
2089 {
2090         struct obd_device *obd;
2091         ENTRY;
2092
2093         /*
2094          * Check that we still have all structures alive as this may
2095          * be some late rpc in shutdown time.
2096          */
2097         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2098                      !exp_connect_lru_resize(req->rq_export))) {
2099                 lustre_msg_set_slv(req->rq_repmsg, 0);
2100                 lustre_msg_set_limit(req->rq_repmsg, 0);
2101                 RETURN(0);
2102         }
2103
2104         /*
2105          * OBD is alive here as export is alive, which we checked above.
2106          */
2107         obd = req->rq_export->exp_obd;
2108
2109         cfs_read_lock(&obd->obd_pool_lock);
2110         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2111         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2112         cfs_read_unlock(&obd->obd_pool_lock);
2113
2114         RETURN(0);
2115 }
2116
2117 int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
2118 {
2119         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2120                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2121                 return (-ECOMM);
2122         }
2123
2124         if (unlikely(rc)) {
2125                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
2126                 req->rq_status = rc;
2127                 return (ptlrpc_send_error(req, 1));
2128         } else {
2129                 DEBUG_REQ(D_NET, req, "sending reply");
2130         }
2131
2132         return (ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT));
2133 }
2134
2135 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2136 {
2137         int                        netrc;
2138         struct ptlrpc_reply_state *rs;
2139         struct obd_device         *obd;
2140         struct obd_export         *exp;
2141         struct ptlrpc_service     *svc;
2142         ENTRY;
2143
2144         if (req->rq_no_reply) {
2145                 EXIT;
2146                 return;
2147         }
2148
2149         svc = req->rq_rqbd->rqbd_service;
2150         rs = req->rq_reply_state;
2151         if (rs == NULL || !rs->rs_difficult) {
2152                 /* no notifiers */
2153                 target_send_reply_msg (req, rc, fail_id);
2154                 EXIT;
2155                 return;
2156         }
2157
2158         /* must be an export if locks saved */
2159         LASSERT (req->rq_export != NULL);
2160         /* req/reply consistent */
2161         LASSERT (rs->rs_service == svc);
2162
2163         /* "fresh" reply */
2164         LASSERT (!rs->rs_scheduled);
2165         LASSERT (!rs->rs_scheduled_ever);
2166         LASSERT (!rs->rs_handled);
2167         LASSERT (!rs->rs_on_net);
2168         LASSERT (rs->rs_export == NULL);
2169         LASSERT (cfs_list_empty(&rs->rs_obd_list));
2170         LASSERT (cfs_list_empty(&rs->rs_exp_list));
2171
2172         exp = class_export_get (req->rq_export);
2173         obd = exp->exp_obd;
2174
2175         /* disable reply scheduling while I'm setting up */
2176         rs->rs_scheduled = 1;
2177         rs->rs_on_net    = 1;
2178         rs->rs_xid       = req->rq_xid;
2179         rs->rs_transno   = req->rq_transno;
2180         rs->rs_export    = exp;
2181         rs->rs_opc       = lustre_msg_get_opc(rs->rs_msg);
2182
2183         cfs_spin_lock(&exp->exp_uncommitted_replies_lock);
2184         CDEBUG(D_NET, "rs transno = "LPU64", last committed = "LPU64"\n",
2185                rs->rs_transno, exp->exp_last_committed);
2186         if (rs->rs_transno > exp->exp_last_committed) {
2187                 /* not committed already */
2188                 cfs_list_add_tail(&rs->rs_obd_list,
2189                                   &exp->exp_uncommitted_replies);
2190         }
2191         cfs_spin_unlock (&exp->exp_uncommitted_replies_lock);
2192
2193         cfs_spin_lock(&exp->exp_lock);
2194         cfs_list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
2195         cfs_spin_unlock(&exp->exp_lock);
2196
2197         netrc = target_send_reply_msg (req, rc, fail_id);
2198
2199         cfs_spin_lock(&svc->srv_rs_lock);
2200
2201         cfs_atomic_inc(&svc->srv_n_difficult_replies);
2202
2203         if (netrc != 0) {
2204                 /* error sending: reply is off the net.  Also we need +1
2205                  * reply ref until ptlrpc_handle_rs() is done
2206                  * with the reply state (if the send was successful, there
2207                  * would have been +1 ref for the net, which
2208                  * reply_out_callback leaves alone) */
2209                 rs->rs_on_net = 0;
2210                 ptlrpc_rs_addref(rs);
2211         }
2212
2213         cfs_spin_lock(&rs->rs_lock);
2214         if (rs->rs_transno <= exp->exp_last_committed ||
2215             (!rs->rs_on_net && !rs->rs_no_ack) ||
2216              cfs_list_empty(&rs->rs_exp_list) ||     /* completed already */
2217              cfs_list_empty(&rs->rs_obd_list)) {
2218                 CDEBUG(D_HA, "Schedule reply immediately\n");
2219                 ptlrpc_dispatch_difficult_reply(rs);
2220         } else {
2221                 cfs_list_add (&rs->rs_list, &svc->srv_active_replies);
2222                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
2223         }
2224         cfs_spin_unlock(&rs->rs_lock);
2225         cfs_spin_unlock(&svc->srv_rs_lock);
2226         EXIT;
2227 }
2228
2229 int target_handle_ping(struct ptlrpc_request *req)
2230 {
2231         obd_ping(req->rq_export);
2232         return req_capsule_server_pack(&req->rq_pill);
2233 }
2234
2235 void target_committed_to_req(struct ptlrpc_request *req)
2236 {
2237         struct obd_export *exp = req->rq_export;
2238
2239         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2240                 lustre_msg_set_last_committed(req->rq_repmsg,
2241                                               exp->exp_last_committed);
2242         else
2243                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2244                           "%d)", exp->exp_obd->obd_no_transno,
2245                           req->rq_repmsg == NULL);
2246
2247         CDEBUG(D_INFO, "last_committed "LPU64", transno "LPU64", xid "LPU64"\n",
2248                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2249 }
2250 EXPORT_SYMBOL(target_committed_to_req);
2251
2252 int target_handle_qc_callback(struct ptlrpc_request *req)
2253 {
2254         struct obd_quotactl *oqctl;
2255         struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
2256
2257         oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2258         if (oqctl == NULL) {
2259                 CERROR("Can't unpack obd_quotactl\n");
2260                 RETURN(-EPROTO);
2261         }
2262
2263         cli->cl_qchk_stat = oqctl->qc_stat;
2264
2265         return 0;
2266 }
2267
2268 #ifdef HAVE_QUOTA_SUPPORT
2269 int target_handle_dqacq_callback(struct ptlrpc_request *req)
2270 {
2271 #ifdef __KERNEL__
2272         struct obd_device *obd = req->rq_export->exp_obd;
2273         struct obd_device *master_obd = NULL, *lov_obd = NULL;
2274         struct obd_device_target *obt;
2275         struct lustre_quota_ctxt *qctxt;
2276         struct qunit_data *qdata = NULL;
2277         int rc = 0;
2278         ENTRY;
2279
2280         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_DROP_QUOTA_REQ))
2281                 RETURN(rc);
2282
2283         rc = req_capsule_server_pack(&req->rq_pill);
2284         if (rc) {
2285                 CERROR("packing reply failed!: rc = %d\n", rc);
2286                 RETURN(rc);
2287         }
2288
2289         LASSERT(req->rq_export);
2290
2291         qdata = quota_get_qdata(req, QUOTA_REQUEST, QUOTA_EXPORT);
2292         if (IS_ERR(qdata)) {
2293                 rc = PTR_ERR(qdata);
2294                 CDEBUG(D_ERROR, "Can't unpack qunit_data(rc: %d)\n", rc);
2295                 req->rq_status = rc;
2296                 GOTO(out, rc);
2297         }
2298
2299         /* we use the observer */
2300         if (obd_pin_observer(obd, &lov_obd) ||
2301             obd_pin_observer(lov_obd, &master_obd)) {
2302                 CERROR("Can't find the observer, it is recovering\n");
2303                 req->rq_status = -EAGAIN;
2304                 GOTO(out, rc);
2305         }
2306
2307         obt = &master_obd->u.obt;
2308         qctxt = &obt->obt_qctxt;
2309
2310         if (!qctxt->lqc_setup || !qctxt->lqc_valid) {
2311                 /* quota_type has not been processed yet, return EAGAIN
2312                  * until we know whether or not quotas are supposed to
2313                  * be enabled */
2314                 CDEBUG(D_QUOTA, "quota_type not processed yet, return "
2315                        "-EAGAIN\n");
2316                 req->rq_status = -EAGAIN;
2317                 GOTO(out, rc);
2318         }
2319
2320         cfs_down_read(&obt->obt_rwsem);
2321         if (qctxt->lqc_lqs_hash == NULL) {
2322                 cfs_up_read(&obt->obt_rwsem);
2323                 /* quota_type has not been processed yet, return EAGAIN
2324                  * until we know whether or not quotas are supposed to
2325                  * be enabled */
2326                 CDEBUG(D_QUOTA, "quota_ctxt is not ready yet, return "
2327                        "-EAGAIN\n");
2328                 req->rq_status = -EAGAIN;
2329                 GOTO(out, rc);
2330         }
2331
2332         LASSERT(qctxt->lqc_handler);
2333         rc = qctxt->lqc_handler(master_obd, qdata,
2334                                 lustre_msg_get_opc(req->rq_reqmsg));
2335         cfs_up_read(&obt->obt_rwsem);
2336         if (rc && rc != -EDQUOT)
2337                 CDEBUG(rc == -EBUSY  ? D_QUOTA : D_ERROR,
2338                        "dqacq/dqrel failed! (rc:%d)\n", rc);
2339         req->rq_status = rc;
2340
2341         rc = quota_copy_qdata(req, qdata, QUOTA_REPLY, QUOTA_EXPORT);
2342         if (rc < 0) {
2343                 CERROR("Can't pack qunit_data(rc: %d)\n", rc);
2344                 GOTO(out, rc);
2345         }
2346
2347         /* Block the quota req. b=14840 */
2348         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_BLOCK_QUOTA_REQ, obd_timeout);
2349         EXIT;
2350
2351 out:
2352         if (master_obd)
2353                 obd_unpin_observer(lov_obd);
2354         if (lov_obd)
2355                 obd_unpin_observer(obd);
2356
2357         rc = ptlrpc_reply(req);
2358         return rc;
2359 #else
2360         return 0;
2361 #endif /* !__KERNEL__ */
2362 }
2363 #endif /* HAVE_QUOTA_SUPPORT */
2364
2365 ldlm_mode_t lck_compat_array[] = {
2366         [LCK_EX] LCK_COMPAT_EX,
2367         [LCK_PW] LCK_COMPAT_PW,
2368         [LCK_PR] LCK_COMPAT_PR,
2369         [LCK_CW] LCK_COMPAT_CW,
2370         [LCK_CR] LCK_COMPAT_CR,
2371         [LCK_NL] LCK_COMPAT_NL,
2372         [LCK_GROUP] LCK_COMPAT_GROUP,
2373         [LCK_COS] LCK_COMPAT_COS,
2374 };
2375
2376 /**
2377  * Rather arbitrary mapping from LDLM error codes to errno values. This should
2378  * not escape to the user level.
2379  */
2380 int ldlm_error2errno(ldlm_error_t error)
2381 {
2382         int result;
2383
2384         switch (error) {
2385         case ELDLM_OK:
2386                 result = 0;
2387                 break;
2388         case ELDLM_LOCK_CHANGED:
2389                 result = -ESTALE;
2390                 break;
2391         case ELDLM_LOCK_ABORTED:
2392                 result = -ENAVAIL;
2393                 break;
2394         case ELDLM_LOCK_REPLACED:
2395                 result = -ESRCH;
2396                 break;
2397         case ELDLM_NO_LOCK_DATA:
2398                 result = -ENOENT;
2399                 break;
2400         case ELDLM_NAMESPACE_EXISTS:
2401                 result = -EEXIST;
2402                 break;
2403         case ELDLM_BAD_NAMESPACE:
2404                 result = -EBADF;
2405                 break;
2406         default:
2407                 if (((int)error) < 0)  /* cast to signed type */
2408                         result = error; /* as ldlm_error_t can be unsigned */
2409                 else {
2410                         CERROR("Invalid DLM result code: %d\n", error);
2411                         result = -EPROTO;
2412                 }
2413         }
2414         return result;
2415 }
2416 EXPORT_SYMBOL(ldlm_error2errno);
2417
2418 /**
2419  * Dual to ldlm_error2errno(): maps errno values back to ldlm_error_t.
2420  */
2421 ldlm_error_t ldlm_errno2error(int err_no)
2422 {
2423         int error;
2424
2425         switch (err_no) {
2426         case 0:
2427                 error = ELDLM_OK;
2428                 break;
2429         case -ESTALE:
2430                 error = ELDLM_LOCK_CHANGED;
2431                 break;
2432         case -ENAVAIL:
2433                 error = ELDLM_LOCK_ABORTED;
2434                 break;
2435         case -ESRCH:
2436                 error = ELDLM_LOCK_REPLACED;
2437                 break;
2438         case -ENOENT:
2439                 error = ELDLM_NO_LOCK_DATA;
2440                 break;
2441         case -EEXIST:
2442                 error = ELDLM_NAMESPACE_EXISTS;
2443                 break;
2444         case -EBADF:
2445                 error = ELDLM_BAD_NAMESPACE;
2446                 break;
2447         default:
2448                 error = err_no;
2449         }
2450         return error;
2451 }
2452 EXPORT_SYMBOL(ldlm_errno2error);
2453
2454 #if LUSTRE_TRACKS_LOCK_EXP_REFS
2455 void ldlm_dump_export_locks(struct obd_export *exp)
2456 {
2457         cfs_spin_lock(&exp->exp_locks_list_guard);
2458         if (!cfs_list_empty(&exp->exp_locks_list)) {
2459             struct ldlm_lock *lock;
2460
2461             CERROR("dumping locks for export %p,"
2462                    "ignore if the unmount doesn't hang\n", exp);
2463             cfs_list_for_each_entry(lock, &exp->exp_locks_list, l_exp_refs_link)
2464                 ldlm_lock_dump(D_ERROR, lock, 0);
2465         }
2466         cfs_spin_unlock(&exp->exp_locks_list_guard);
2467 }
2468 #endif