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  * Copyright (c) 2011 Whamcloud, Inc.
  34  */
  35 /*
  36  * This file is part of Lustre, http://www.lustre.org/
  37  * Lustre is a trademark of Sun Microsystems, Inc.
  38  */
  39
  40 #ifndef EXPORT_SYMTAB
  41 # define EXPORT_SYMTAB
  42 #endif
  43 #define DEBUG_SUBSYSTEM S_LDLM
  44
  45 #ifdef __KERNEL__
  46 # include <libcfs/libcfs.h>
  47 #else
  48 # include <liblustre.h>
  49 #endif
  50 #include <obd.h>
  51 #include <lustre_mds.h>
  52 #include <lustre_dlm.h>
  53 #include <lustre_net.h>
  54 #include <lustre_sec.h>
  55 #include "ldlm_internal.h"
  56
  57 /* @priority: if non-zero, move the selected to the list head
  58  * @create: if zero, only search in existed connections
  59  */
  60 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  61                            int priority, int create)
  62 {
  63         struct ptlrpc_connection *ptlrpc_conn;
  64         struct obd_import_conn *imp_conn = NULL, *item;
  65         int rc = 0;
  66         ENTRY;
  67
  68         if (!create && !priority) {
  69                 CDEBUG(D_HA, "Nothing to do\n");
  70                 RETURN(-EINVAL);
  71         }
  72
  73         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
  74         if (!ptlrpc_conn) {
  75                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  76                 RETURN (-ENOENT);
  77         }
  78
  79         if (create) {
  80                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  81                 if (!imp_conn) {
  82                         GOTO(out_put, rc = -ENOMEM);
  83                 }
  84         }
  85
  86         cfs_spin_lock(&imp->imp_lock);
  87         cfs_list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  88                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  89                         if (priority) {
  90                                 cfs_list_del(&item->oic_item);
  91                                 cfs_list_add(&item->oic_item,
  92                                              &imp->imp_conn_list);
  93                                 item->oic_last_attempt = 0;
  94                         }
  95                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  96                                imp, imp->imp_obd->obd_name, uuid->uuid,
  97                                (priority ? ", moved to head" : ""));
  98                         cfs_spin_unlock(&imp->imp_lock);
  99                         GOTO(out_free, rc = 0);
 100                 }
 101         }
 102         /* not found */
 103         if (create) {
 104                 imp_conn->oic_conn = ptlrpc_conn;
 105                 imp_conn->oic_uuid = *uuid;
 106                 imp_conn->oic_last_attempt = 0;
 107                 if (priority)
 108                         cfs_list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 109                 else
 110                         cfs_list_add_tail(&imp_conn->oic_item,
 111                                           &imp->imp_conn_list);
 112                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 113                        imp, imp->imp_obd->obd_name, uuid->uuid,
 114                        (priority ? "head" : "tail"));
 115         } else {
 116                 cfs_spin_unlock(&imp->imp_lock);
 117                 GOTO(out_free, rc = -ENOENT);
 118         }
 119
 120         cfs_spin_unlock(&imp->imp_lock);
 121         RETURN(0);
 122 out_free:
 123         if (imp_conn)
 124                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 125 out_put:
 126         ptlrpc_connection_put(ptlrpc_conn);
 127         RETURN(rc);
 128 }
 129
 130 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 131 {
 132         return import_set_conn(imp, uuid, 1, 0);
 133 }
 134
 135 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 136                            int priority)
 137 {
 138         return import_set_conn(imp, uuid, priority, 1);
 139 }
 140
 141 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 142 {
 143         struct obd_import_conn *imp_conn;
 144         struct obd_export *dlmexp;
 145         int rc = -ENOENT;
 146         ENTRY;
 147
 148         cfs_spin_lock(&imp->imp_lock);
 149         if (cfs_list_empty(&imp->imp_conn_list)) {
 150                 LASSERT(!imp->imp_connection);
 151                 GOTO(out, rc);
 152         }
 153
 154         cfs_list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 155                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 156                         continue;
 157                 LASSERT(imp_conn->oic_conn);
 158
 159                 /* is current conn? */
 160                 if (imp_conn == imp->imp_conn_current) {
 161                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 162
 163                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 164                             imp->imp_state != LUSTRE_IMP_DISCON) {
 165                                 CERROR("can't remove current connection\n");
 166                                 GOTO(out, rc = -EBUSY);
 167                         }
 168
 169                         ptlrpc_connection_put(imp->imp_connection);
 170                         imp->imp_connection = NULL;
 171
 172                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 173                         if (dlmexp && dlmexp->exp_connection) {
 174                                 LASSERT(dlmexp->exp_connection ==
 175                                         imp_conn->oic_conn);
 176                                 ptlrpc_connection_put(dlmexp->exp_connection);
 177                                 dlmexp->exp_connection = NULL;
 178                         }
 179                 }
 180
 181                 cfs_list_del(&imp_conn->oic_item);
 182                 ptlrpc_connection_put(imp_conn->oic_conn);
 183                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 184                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 185                        imp, imp->imp_obd->obd_name, uuid->uuid);
 186                 rc = 0;
 187                 break;
 188         }
 189 out:
 190         cfs_spin_unlock(&imp->imp_lock);
 191         if (rc == -ENOENT)
 192                 CERROR("connection %s not found\n", uuid->uuid);
 193         RETURN(rc);
 194 }
 195
 196 void client_destroy_import(struct obd_import *imp)
 197 {
 198         /* drop security policy instance after all rpc finished/aborted
 199          * to let all busy contexts be released. */
 200         class_import_get(imp);
 201         class_destroy_import(imp);
 202         sptlrpc_import_sec_put(imp);
 203         class_import_put(imp);
 204 }
 205
 206 /* configure an RPC client OBD device
 207  *
 208  * lcfg parameters:
 209  * 1 - client UUID
 210  * 2 - server UUID
 211  * 3 - inactive-on-startup
 212  */
 213 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 214 {
 215         struct client_obd *cli = &obddev->u.cli;
 216         struct obd_import *imp;
 217         struct obd_uuid server_uuid;
 218         int rq_portal, rp_portal, connect_op;
 219         char *name = obddev->obd_type->typ_name;
 220         ldlm_ns_type_t ns_type = LDLM_NS_TYPE_UNKNOWN;
 221         int rc;
 222         ENTRY;
 223
 224         /* In a more perfect world, we would hang a ptlrpc_client off of
 225          * obd_type and just use the values from there. */
 226         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 227                 rq_portal = OST_REQUEST_PORTAL;
 228                 rp_portal = OSC_REPLY_PORTAL;
 229                 connect_op = OST_CONNECT;
 230                 cli->cl_sp_me = LUSTRE_SP_CLI;
 231                 cli->cl_sp_to = LUSTRE_SP_OST;
 232                 ns_type = LDLM_NS_TYPE_OSC;
 233
 234         } else if (!strcmp(name, LUSTRE_MDC_NAME)) {
 235                 rq_portal = MDS_REQUEST_PORTAL;
 236                 rp_portal = MDC_REPLY_PORTAL;
 237                 connect_op = MDS_CONNECT;
 238                 cli->cl_sp_me = LUSTRE_SP_CLI;
 239                 cli->cl_sp_to = LUSTRE_SP_MDT;
 240                 ns_type = LDLM_NS_TYPE_MDC;
 241
 242         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 243                 rq_portal = MGS_REQUEST_PORTAL;
 244                 rp_portal = MGC_REPLY_PORTAL;
 245                 connect_op = MGS_CONNECT;
 246                 cli->cl_sp_me = LUSTRE_SP_MGC;
 247                 cli->cl_sp_to = LUSTRE_SP_MGS;
 248                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 249                 ns_type = LDLM_NS_TYPE_MGC;
 250
 251         } else {
 252                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 253                        name);
 254                 RETURN(-EINVAL);
 255         }
 256
 257         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 258                 CERROR("requires a TARGET UUID\n");
 259                 RETURN(-EINVAL);
 260         }
 261
 262         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 263                 CERROR("client UUID must be less than 38 characters\n");
 264                 RETURN(-EINVAL);
 265         }
 266
 267         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 268                 CERROR("setup requires a SERVER UUID\n");
 269                 RETURN(-EINVAL);
 270         }
 271
 272         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 273                 CERROR("target UUID must be less than 38 characters\n");
 274                 RETURN(-EINVAL);
 275         }
 276
 277         cfs_init_rwsem(&cli->cl_sem);
 278         cfs_sema_init(&cli->cl_mgc_sem, 1);
 279         cli->cl_conn_count = 0;
 280         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 281                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 282                      sizeof(server_uuid)));
 283
 284         cli->cl_dirty = 0;
 285         cli->cl_avail_grant = 0;
 286         /* FIXME: should limit this for the sum of all cl_dirty_max */
 287         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 288         if (cli->cl_dirty_max >> CFS_PAGE_SHIFT > cfs_num_physpages / 8)
 289                 cli->cl_dirty_max = cfs_num_physpages << (CFS_PAGE_SHIFT - 3);
 290         CFS_INIT_LIST_HEAD(&cli->cl_cache_waiters);
 291         CFS_INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 292         CFS_INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 293         CFS_INIT_LIST_HEAD(&cli->cl_loi_write_list);
 294         CFS_INIT_LIST_HEAD(&cli->cl_loi_read_list);
 295         client_obd_list_lock_init(&cli->cl_loi_list_lock);
 296         cli->cl_r_in_flight = 0;
 297         cli->cl_w_in_flight = 0;
 298
 299         cfs_spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 300         cfs_spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 301         cfs_spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 302         cfs_spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 303         cfs_spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 304         cfs_spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 305         cfs_waitq_init(&cli->cl_destroy_waitq);
 306         cfs_atomic_set(&cli->cl_destroy_in_flight, 0);
 307 #ifdef ENABLE_CHECKSUM
 308         /* Turn on checksumming by default. */
 309         cli->cl_checksum = 1;
 310         /*
 311          * The supported checksum types will be worked out at connect time
 312          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 313          * through procfs.
 314          */
 315         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 316 #endif
 317         cfs_atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 318
 319         /* This value may be changed at connect time in
 320            ptlrpc_connect_interpret. */
 321         cli->cl_max_pages_per_rpc = min((int)PTLRPC_MAX_BRW_PAGES,
 322                                         (int)(1024 * 1024 >> CFS_PAGE_SHIFT));
 323
 324         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 325                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
 326         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 128 /* MB */) {
 327                 cli->cl_max_rpcs_in_flight = 2;
 328         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 256 /* MB */) {
 329                 cli->cl_max_rpcs_in_flight = 3;
 330         } else if (cfs_num_physpages >> (20 - CFS_PAGE_SHIFT) <= 512 /* MB */) {
 331                 cli->cl_max_rpcs_in_flight = 4;
 332         } else {
 333                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 334         }
 335
 336         rc = ldlm_get_ref();
 337         if (rc) {
 338                 CERROR("ldlm_get_ref failed: %d\n", rc);
 339                 GOTO(err, rc);
 340         }
 341
 342         ptlrpc_init_client(rq_portal, rp_portal, name,
 343                            &obddev->obd_ldlm_client);
 344
 345         imp = class_new_import(obddev);
 346         if (imp == NULL)
 347                 GOTO(err_ldlm, rc = -ENOENT);
 348         imp->imp_client = &obddev->obd_ldlm_client;
 349         imp->imp_connect_op = connect_op;
 350         CFS_INIT_LIST_HEAD(&imp->imp_pinger_chain);
 351         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 352                LUSTRE_CFG_BUFLEN(lcfg, 1));
 353         class_import_put(imp);
 354
 355         rc = client_import_add_conn(imp, &server_uuid, 1);
 356         if (rc) {
 357                 CERROR("can't add initial connection\n");
 358                 GOTO(err_import, rc);
 359         }
 360
 361         cli->cl_import = imp;
 362         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 363         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 364         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 365
 366         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 367                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 368                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 369                                name, obddev->obd_name,
 370                                cli->cl_target_uuid.uuid);
 371                         cfs_spin_lock(&imp->imp_lock);
 372                         imp->imp_deactive = 1;
 373                         cfs_spin_unlock(&imp->imp_lock);
 374                 }
 375         }
 376
 377         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 378                                                    LDLM_NAMESPACE_CLIENT,
 379                                                    LDLM_NAMESPACE_GREEDY,
 380                                                    ns_type);
 381         if (obddev->obd_namespace == NULL) {
 382                 CERROR("Unable to create client namespace - %s\n",
 383                        obddev->obd_name);
 384                 GOTO(err_import, rc = -ENOMEM);
 385         }
 386
 387         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 388
 389         RETURN(rc);
 390
 391 err_import:
 392         class_destroy_import(imp);
 393 err_ldlm:
 394         ldlm_put_ref();
 395 err:
 396         RETURN(rc);
 397
 398 }
 399
 400 int client_obd_cleanup(struct obd_device *obddev)
 401 {
 402         ENTRY;
 403
 404         ldlm_namespace_free_post(obddev->obd_namespace);
 405         obddev->obd_namespace = NULL;
 406
 407         ldlm_put_ref();
 408         RETURN(0);
 409 }
 410
 411 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 412 int client_connect_import(const struct lu_env *env,
 413                           struct obd_export **exp,
 414                           struct obd_device *obd, struct obd_uuid *cluuid,
 415                           struct obd_connect_data *data, void *localdata)
 416 {
 417         struct client_obd *cli = &obd->u.cli;
 418         struct obd_import *imp = cli->cl_import;
 419         struct obd_connect_data *ocd;
 420         struct lustre_handle conn = { 0 };
 421         int rc;
 422         ENTRY;
 423
 424         *exp = NULL;
 425         cfs_down_write(&cli->cl_sem);
 426         if (cli->cl_conn_count > 0 )
 427                 GOTO(out_sem, rc = -EALREADY);
 428
 429         rc = class_connect(&conn, obd, cluuid);
 430         if (rc)
 431                 GOTO(out_sem, rc);
 432
 433         cli->cl_conn_count++;
 434         *exp = class_conn2export(&conn);
 435
 436         LASSERT(obd->obd_namespace);
 437
 438         imp->imp_dlm_handle = conn;
 439         rc = ptlrpc_init_import(imp);
 440         if (rc != 0)
 441                 GOTO(out_ldlm, rc);
 442
 443         ocd = &imp->imp_connect_data;
 444         if (data) {
 445                 *ocd = *data;
 446                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 447         }
 448
 449         rc = ptlrpc_connect_import(imp, NULL);
 450         if (rc != 0) {
 451                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 452                 GOTO(out_ldlm, rc);
 453         }
 454         LASSERT((*exp)->exp_connection);
 455
 456         if (data) {
 457                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 458                          ocd->ocd_connect_flags, "old "LPX64", new "LPX64"\n",
 459                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 460                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 461         }
 462
 463         ptlrpc_pinger_add_import(imp);
 464
 465         EXIT;
 466
 467         if (rc) {
 468 out_ldlm:
 469                 cli->cl_conn_count--;
 470                 class_disconnect(*exp);
 471                 *exp = NULL;
 472         }
 473 out_sem:
 474         cfs_up_write(&cli->cl_sem);
 475
 476         return rc;
 477 }
 478
 479 int client_disconnect_export(struct obd_export *exp)
 480 {
 481         struct obd_device *obd = class_exp2obd(exp);
 482         struct client_obd *cli;
 483         struct obd_import *imp;
 484         int rc = 0, err;
 485         ENTRY;
 486
 487         if (!obd) {
 488                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 489                        exp, exp ? exp->exp_handle.h_cookie : -1);
 490                 RETURN(-EINVAL);
 491         }
 492
 493         cli = &obd->u.cli;
 494         imp = cli->cl_import;
 495
 496         cfs_down_write(&cli->cl_sem);
 497         CDEBUG(D_INFO, "disconnect %s - %d\n", obd->obd_name,
 498                cli->cl_conn_count);
 499
 500         if (!cli->cl_conn_count) {
 501                 CERROR("disconnecting disconnected device (%s)\n",
 502                        obd->obd_name);
 503                 GOTO(out_disconnect, rc = -EINVAL);
 504         }
 505
 506         cli->cl_conn_count--;
 507         if (cli->cl_conn_count)
 508                 GOTO(out_disconnect, rc = 0);
 509
 510         /* Mark import deactivated now, so we don't try to reconnect if any
 511          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
 512          * fully deactivate the import, or that would drop all requests. */
 513         cfs_spin_lock(&imp->imp_lock);
 514         imp->imp_deactive = 1;
 515         cfs_spin_unlock(&imp->imp_lock);
 516
 517         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 518          * delete it regardless.  (It's safe to delete an import that was
 519          * never added.) */
 520         (void)ptlrpc_pinger_del_import(imp);
 521
 522         if (obd->obd_namespace != NULL) {
 523                 /* obd_force == local only */
 524                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 525                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 526                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 527         }
 528
 529         /*
 530          * there's no need to hold sem during disconnecting an import,
 531          * and actually it may cause deadlock in gss.
 532          */
 533         cfs_up_write(&cli->cl_sem);
 534         rc = ptlrpc_disconnect_import(imp, 0);
 535         cfs_down_write(&cli->cl_sem);
 536
 537         ptlrpc_invalidate_import(imp);
 538
 539         if (imp->imp_rq_pool) {
 540                 ptlrpc_free_rq_pool(imp->imp_rq_pool);
 541                 imp->imp_rq_pool = NULL;
 542         }
 543         client_destroy_import(imp);
 544         cli->cl_import = NULL;
 545
 546         EXIT;
 547
 548  out_disconnect:
 549         /* use server style - class_disconnect should be always called for
 550          * o_disconnect */
 551         err = class_disconnect(exp);
 552         if (!rc && err)
 553                 rc = err;
 554
 555         cfs_up_write(&cli->cl_sem);
 556
 557         RETURN(rc);
 558 }
 559
 560 int server_disconnect_export(struct obd_export *exp)
 561 {
 562         int rc;
 563         ENTRY;
 564
 565         /* Disconnect early so that clients can't keep using export */
 566         rc = class_disconnect(exp);
 567         /* close import for avoid sending any requests */
 568         if (exp->exp_imp_reverse)
 569                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 570
 571         if (exp->exp_obd->obd_namespace != NULL)
 572                 ldlm_cancel_locks_for_export(exp);
 573
 574         /* complete all outstanding replies */
 575         cfs_spin_lock(&exp->exp_lock);
 576         while (!cfs_list_empty(&exp->exp_outstanding_replies)) {
 577                 struct ptlrpc_reply_state *rs =
 578                         cfs_list_entry(exp->exp_outstanding_replies.next,
 579                                        struct ptlrpc_reply_state, rs_exp_list);
 580                 struct ptlrpc_service *svc = rs->rs_service;
 581
 582                 cfs_spin_lock(&svc->srv_rs_lock);
 583                 cfs_list_del_init(&rs->rs_exp_list);
 584                 cfs_spin_lock(&rs->rs_lock);
 585                 ptlrpc_schedule_difficult_reply(rs);
 586                 cfs_spin_unlock(&rs->rs_lock);
 587                 cfs_spin_unlock(&svc->srv_rs_lock);
 588         }
 589         cfs_spin_unlock(&exp->exp_lock);
 590
 591         RETURN(rc);
 592 }
 593
 594 /* --------------------------------------------------------------------------
 595  * from old lib/target.c
 596  * -------------------------------------------------------------------------- */
 597
 598 static int target_handle_reconnect(struct lustre_handle *conn,
 599                                    struct obd_export *exp,
 600                                    struct obd_uuid *cluuid)
 601 {
 602         ENTRY;
 603         if (exp->exp_connection && exp->exp_imp_reverse) {
 604                 struct lustre_handle *hdl;
 605                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 606                 /* Might be a re-connect after a partition. */
 607                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 608                         CWARN("%s: %s reconnecting\n", exp->exp_obd->obd_name,
 609                               cluuid->uuid);
 610                         conn->cookie = exp->exp_handle.h_cookie;
 611                         /* target_handle_connect() treats EALREADY and
 612                          * -EALREADY differently.  EALREADY means we are
 613                          * doing a valid reconnect from the same client. */
 614                         RETURN(EALREADY);
 615                 } else {
 616                         CERROR("%s reconnecting from %s, "
 617                                "handle mismatch (ours "LPX64", theirs "
 618                                LPX64")\n", cluuid->uuid,
 619                                exp->exp_connection->c_remote_uuid.uuid,
 620                                hdl->cookie, conn->cookie);
 621                         memset(conn, 0, sizeof *conn);
 622                         /* target_handle_connect() treats EALREADY and
 623                          * -EALREADY differently.  -EALREADY is an error
 624                          * (same UUID, different handle). */
 625                         RETURN(-EALREADY);
 626                 }
 627         }
 628
 629         conn->cookie = exp->exp_handle.h_cookie;
 630         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
 631                cluuid->uuid, exp, conn->cookie);
 632         RETURN(0);
 633 }
 634
 635 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
 636                           int error)
 637 {
 638         struct obd_export *exp = cb_data;
 639
 640         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 641                obd->obd_name, exp->exp_client_uuid.uuid);
 642
 643         cfs_spin_lock(&exp->exp_lock);
 644         exp->exp_need_sync = 0;
 645         cfs_spin_unlock(&exp->exp_lock);
 646         class_export_cb_put(exp);
 647 }
 648 EXPORT_SYMBOL(target_client_add_cb);
 649
 650 static void
 651 target_start_and_reset_recovery_timer(struct obd_device *obd,
 652                                       struct ptlrpc_request *req,
 653                                       int new_client);
 654
 655 int target_handle_connect(struct ptlrpc_request *req)
 656 {
 657         struct obd_device *target, *targref = NULL;
 658         struct obd_export *export = NULL;
 659         struct obd_import *revimp;
 660         struct lustre_handle conn;
 661         struct lustre_handle *tmp;
 662         struct obd_uuid tgtuuid;
 663         struct obd_uuid cluuid;
 664         struct obd_uuid remote_uuid;
 665         char *str;
 666         int rc = 0;
 667         int mds_conn = 0;
 668         struct obd_connect_data *data, *tmpdata;
 669         lnet_nid_t *client_nid = NULL;
 670         ENTRY;
 671
 672         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 673
 674         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 675         if (str == NULL) {
 676                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 677                 GOTO(out, rc = -EINVAL);
 678         }
 679
 680         obd_str2uuid(&tgtuuid, str);
 681         target = class_uuid2obd(&tgtuuid);
 682         if (!target)
 683                 target = class_name2obd(str);
 684
 685         if (!target || target->obd_stopping || !target->obd_set_up) {
 686                 LCONSOLE_ERROR_MSG(0x137, "UUID '%s' is not available "
 687                                    " for connect (%s)\n", str,
 688                                    !target ? "no target" :
 689                                    (target->obd_stopping ? "stopping" :
 690                                    "not set up"));
 691                 GOTO(out, rc = -ENODEV);
 692         }
 693
 694         if (target->obd_no_conn) {
 695                 LCONSOLE_WARN("%s: temporarily refusing client connection "
 696                               "from %s\n", target->obd_name,
 697                               libcfs_nid2str(req->rq_peer.nid));
 698                 GOTO(out, rc = -EAGAIN);
 699         }
 700
 701         /* Make sure the target isn't cleaned up while we're here. Yes,
 702            there's still a race between the above check and our incref here.
 703            Really, class_uuid2obd should take the ref. */
 704         targref = class_incref(target, __FUNCTION__, cfs_current());
 705
 706
 707         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
 708         if (str == NULL) {
 709                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
 710                 GOTO(out, rc = -EINVAL);
 711         }
 712
 713         obd_str2uuid(&cluuid, str);
 714
 715         /* XXX extract a nettype and format accordingly */
 716         switch (sizeof(lnet_nid_t)) {
 717                 /* NB the casts only avoid compiler warnings */
 718         case 8:
 719                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 720                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
 721                 break;
 722         case 4:
 723                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 724                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
 725                 break;
 726         default:
 727                 LBUG();
 728         }
 729
 730         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 731         if (tmp == NULL)
 732                 GOTO(out, rc = -EPROTO);
 733
 734         conn = *tmp;
 735
 736         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 737         if (!data)
 738                 GOTO(out, rc = -EPROTO);
 739
 740         rc = req_capsule_server_pack(&req->rq_pill);
 741         if (rc)
 742                 GOTO(out, rc);
 743
 744         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 745                 if (!data) {
 746                         DEBUG_REQ(D_WARNING, req, "Refusing old (unversioned) "
 747                                   "libclient connection attempt");
 748                         GOTO(out, rc = -EPROTO);
 749                 } else if (data->ocd_version < LUSTRE_VERSION_CODE -
 750                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
 751                            data->ocd_version > LUSTRE_VERSION_CODE +
 752                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
 753                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
 754                                   "libclient connection attempt",
 755                                   data->ocd_version < LUSTRE_VERSION_CODE ?
 756                                   "old" : "new",
 757                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
 758                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
 759                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
 760                                   OBD_OCD_VERSION_FIX(data->ocd_version));
 761                         data = req_capsule_server_sized_get(&req->rq_pill,
 762                                                         &RMF_CONNECT_DATA,
 763                                     offsetof(typeof(*data), ocd_version) +
 764                                              sizeof(data->ocd_version));
 765                         if (data) {
 766                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
 767                                 data->ocd_version = LUSTRE_VERSION_CODE;
 768                         }
 769                         GOTO(out, rc = -EPROTO);
 770                 }
 771         }
 772
 773         if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) &&
 774             (data->ocd_connect_flags & OBD_CONNECT_MDS))
 775                 mds_conn = 1;
 776
 777         /* lctl gets a backstage, all-access pass. */
 778         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 779                 goto dont_check_exports;
 780
 781         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
 782         if (!export)
 783                 goto no_export;
 784
 785         /* we've found an export in the hash */
 786         if (export->exp_connecting) { /* bug 9635, et. al. */
 787                 CWARN("%s: exp %p already connecting\n",
 788                       export->exp_obd->obd_name, export);
 789                 class_export_put(export);
 790                 export = NULL;
 791                 rc = -EALREADY;
 792         } else if (mds_conn && export->exp_connection) {
 793                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid)
 794                         /* mds reconnected after failover */
 795                         CWARN("%s: received MDS connection from NID %s,"
 796                               " removing former export from NID %s\n",
 797                             target->obd_name, libcfs_nid2str(req->rq_peer.nid),
 798                             libcfs_nid2str(export->exp_connection->c_peer.nid));
 799                 else
 800                         /* new mds connection from the same nid */
 801                         CWARN("%s: received new MDS connection from NID %s,"
 802                               " removing former export from same NID\n",
 803                             target->obd_name, libcfs_nid2str(req->rq_peer.nid));
 804                 class_fail_export(export);
 805                 class_export_put(export);
 806                 export = NULL;
 807                 rc = 0;
 808         } else if (export->exp_connection != NULL &&
 809                    req->rq_peer.nid != export->exp_connection->c_peer.nid &&
 810                    (lustre_msg_get_op_flags(req->rq_reqmsg) &
 811                     MSG_CONNECT_INITIAL)) {
 812                 /* in mds failover we have static uuid but nid can be
 813                  * changed*/
 814                 CWARN("%s: cookie %s seen on new NID %s when "
 815                       "existing NID %s is already connected\n",
 816                       target->obd_name, cluuid.uuid,
 817                       libcfs_nid2str(req->rq_peer.nid),
 818                       libcfs_nid2str(export->exp_connection->c_peer.nid));
 819                 rc = -EALREADY;
 820                 class_export_put(export);
 821                 export = NULL;
 822         } else {
 823                 cfs_spin_lock(&export->exp_lock);
 824                 export->exp_connecting = 1;
 825                 cfs_spin_unlock(&export->exp_lock);
 826                 class_export_put(export);
 827                 LASSERT(export->exp_obd == target);
 828
 829                 rc = target_handle_reconnect(&conn, export, &cluuid);
 830         }
 831
 832         /* If we found an export, we already unlocked. */
 833         if (!export) {
 834 no_export:
 835                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
 836         } else if (req->rq_export == NULL &&
 837                    cfs_atomic_read(&export->exp_rpc_count) > 0) {
 838                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
 839                       target->obd_name, cluuid.uuid,
 840                       libcfs_nid2str(req->rq_peer.nid),
 841                       export, cfs_atomic_read(&export->exp_refcount));
 842                 GOTO(out, rc = -EBUSY);
 843         } else if (req->rq_export != NULL &&
 844                    (cfs_atomic_read(&export->exp_rpc_count) > 1)) {
 845                 /* the current connect rpc has increased exp_rpc_count */
 846                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
 847                       target->obd_name, cluuid.uuid,
 848                       libcfs_nid2str(req->rq_peer.nid),
 849                       export, cfs_atomic_read(&export->exp_rpc_count) - 1);
 850                 cfs_spin_lock(&export->exp_lock);
 851                 if (req->rq_export->exp_conn_cnt <
 852                     lustre_msg_get_conn_cnt(req->rq_reqmsg))
 853                         /* try to abort active requests */
 854                         req->rq_export->exp_abort_active_req = 1;
 855                 cfs_spin_unlock(&export->exp_lock);
 856                 GOTO(out, rc = -EBUSY);
 857         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
 858                 CERROR("%s: NID %s (%s) reconnected with 1 conn_cnt; "
 859                        "cookies not random?\n", target->obd_name,
 860                        libcfs_nid2str(req->rq_peer.nid), cluuid.uuid);
 861                 GOTO(out, rc = -EALREADY);
 862         } else {
 863                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
 864         }
 865
 866         if (rc < 0) {
 867                 GOTO(out, rc);
 868         }
 869
 870         CWARN("%s: connection from %s@%s %st"LPU64" exp %p cur %ld last %ld\n",
 871                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 872               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
 873               export, (long)cfs_time_current_sec(),
 874               export ? (long)export->exp_last_request_time : 0);
 875
 876         /* If this is the first time a client connects,
 877          * reset the recovery timer */
 878         if (rc == 0 && target->obd_recovering)
 879                 target_start_and_reset_recovery_timer(target, req, !export);
 880
 881         /* We want to handle EALREADY but *not* -EALREADY from
 882          * target_handle_reconnect(), return reconnection state in a flag */
 883         if (rc == EALREADY) {
 884                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 885                 rc = 0;
 886         } else {
 887                 LASSERT(rc == 0);
 888         }
 889
 890         /* Tell the client if we support replayable requests */
 891         if (target->obd_replayable)
 892                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 893         client_nid = &req->rq_peer.nid;
 894
 895         if (export == NULL) {
 896                 if (target->obd_recovering) {
 897                         cfs_time_t t;
 898
 899                         t = cfs_timer_deadline(&target->obd_recovery_timer);
 900                         t = cfs_time_sub(t, cfs_time_current());
 901                         CERROR("%s: denying connection for new client %s (%s): "
 902                                "%d clients in recovery for "CFS_TIME_T"s\n",
 903                                target->obd_name,
 904                                libcfs_nid2str(req->rq_peer.nid), cluuid.uuid,
 905                                cfs_atomic_read(&target-> \
 906                                                obd_lock_replay_clients),
 907                                cfs_duration_sec(t));
 908                         rc = -EBUSY;
 909                 } else {
 910 dont_check_exports:
 911                         rc = obd_connect(req->rq_svc_thread->t_env,
 912                                          &export, target, &cluuid, data,
 913                                          client_nid);
 914                         if (rc == 0)
 915                                 conn.cookie = export->exp_handle.h_cookie;
 916                 }
 917         } else {
 918                 rc = obd_reconnect(req->rq_svc_thread->t_env,
 919                                    export, target, &cluuid, data, client_nid);
 920                 if (rc == 0)
 921                         /* prevous done via class_conn2export */
 922                         class_export_get(export);
 923         }
 924         if (rc)
 925                 GOTO(out, rc);
 926         /* Return only the parts of obd_connect_data that we understand, so the
 927          * client knows that we don't understand the rest. */
 928         if (data) {
 929                  tmpdata = req_capsule_server_get(&req->rq_pill,
 930                                                   &RMF_CONNECT_DATA);
 931                   //data->ocd_connect_flags &= OBD_CONNECT_SUPPORTED;
 932                  *tmpdata = *data;
 933         }
 934
 935         /* If all else goes well, this is our RPC return code. */
 936         req->rq_status = 0;
 937
 938         lustre_msg_set_handle(req->rq_repmsg, &conn);
 939
 940         /* If the client and the server are the same node, we will already
 941          * have an export that really points to the client's DLM export,
 942          * because we have a shared handles table.
 943          *
 944          * XXX this will go away when shaver stops sending the "connect" handle
 945          * in the real "remote handle" field of the request --phik 24 Apr 2003
 946          */
 947         if (req->rq_export != NULL)
 948                 class_export_put(req->rq_export);
 949
 950         req->rq_export = export;
 951
 952         cfs_spin_lock(&export->exp_lock);
 953         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
 954                 cfs_spin_unlock(&export->exp_lock);
 955                 CERROR("%s: %s already connected at higher conn_cnt: %d > %d\n",
 956                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 957                        export->exp_conn_cnt,
 958                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
 959
 960                 GOTO(out, rc = -EALREADY);
 961         }
 962         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
 963         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
 964         export->exp_abort_active_req = 0;
 965
 966         /* request from liblustre?  Don't evict it for not pinging. */
 967         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 968                 export->exp_libclient = 1;
 969                 cfs_spin_unlock(&export->exp_lock);
 970
 971                 cfs_spin_lock(&target->obd_dev_lock);
 972                 cfs_list_del_init(&export->exp_obd_chain_timed);
 973                 cfs_spin_unlock(&target->obd_dev_lock);
 974         } else {
 975                 cfs_spin_unlock(&export->exp_lock);
 976         }
 977
 978         if (export->exp_connection != NULL) {
 979                 /* Check to see if connection came from another NID */
 980                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
 981                     !cfs_hlist_unhashed(&export->exp_nid_hash))
 982                         cfs_hash_del(export->exp_obd->obd_nid_hash,
 983                                      &export->exp_connection->c_peer.nid,
 984                                      &export->exp_nid_hash);
 985
 986                 ptlrpc_connection_put(export->exp_connection);
 987         }
 988
 989         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
 990                                                        req->rq_self,
 991                                                        &remote_uuid);
 992         if (cfs_hlist_unhashed(&export->exp_nid_hash)) {
 993                 cfs_hash_add(export->exp_obd->obd_nid_hash,
 994                              &export->exp_connection->c_peer.nid,
 995                              &export->exp_nid_hash);
 996         }
 997
 998         cfs_spin_lock(&target->obd_recovery_task_lock);
 999         if (target->obd_recovering && !export->exp_in_recovery) {
1000                 cfs_spin_lock(&export->exp_lock);
1001                 export->exp_in_recovery = 1;
1002                 export->exp_req_replay_needed = 1;
1003                 export->exp_lock_replay_needed = 1;
1004                 cfs_spin_unlock(&export->exp_lock);
1005                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
1006                      && (data->ocd_transno == 0))
1007                         CWARN("Connect with zero transno!\n");
1008
1009                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
1010                      && data->ocd_transno < target->obd_next_recovery_transno)
1011                         target->obd_next_recovery_transno = data->ocd_transno;
1012                 target->obd_connected_clients++;
1013                 cfs_atomic_inc(&target->obd_req_replay_clients);
1014                 cfs_atomic_inc(&target->obd_lock_replay_clients);
1015                 if (target->obd_connected_clients ==
1016                     target->obd_max_recoverable_clients)
1017                         cfs_waitq_signal(&target->obd_next_transno_waitq);
1018         }
1019         cfs_spin_unlock(&target->obd_recovery_task_lock);
1020
1021         /* Tell the client we're in recovery, when client is involved in it. */
1022         if (target->obd_recovering)
1023                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1024
1025         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1026         conn = *tmp;
1027
1028         if (export->exp_imp_reverse != NULL) {
1029                 /* destroyed import can be still referenced in ctxt */
1030                 obd_set_info_async(export, sizeof(KEY_REVIMP_UPD),
1031                                    KEY_REVIMP_UPD, 0, NULL, NULL);
1032
1033                 client_destroy_import(export->exp_imp_reverse);
1034         }
1035
1036         /* for the rest part, we return -ENOTCONN in case of errors
1037          * in order to let client initialize connection again.
1038          */
1039         revimp = export->exp_imp_reverse = class_new_import(target);
1040         if (!revimp) {
1041                 CERROR("fail to alloc new reverse import.\n");
1042                 GOTO(out, rc = -ENOTCONN);
1043         }
1044
1045         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
1046         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
1047         revimp->imp_remote_handle = conn;
1048         revimp->imp_dlm_fake = 1;
1049         revimp->imp_state = LUSTRE_IMP_FULL;
1050
1051         /* unknown versions will be caught in
1052          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
1053         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1054
1055         if ((export->exp_connect_flags & OBD_CONNECT_AT) &&
1056             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1057                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1058         else
1059                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1060
1061         if ((export->exp_connect_flags & OBD_CONNECT_FULL20) &&
1062             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1063                 revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
1064         else
1065                 revimp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
1066
1067         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
1068         if (rc) {
1069                 CERROR("Failed to get sec for reverse import: %d\n", rc);
1070                 export->exp_imp_reverse = NULL;
1071                 class_destroy_import(revimp);
1072         }
1073
1074         class_import_put(revimp);
1075 out:
1076         if (export) {
1077                 cfs_spin_lock(&export->exp_lock);
1078                 export->exp_connecting = 0;
1079                 cfs_spin_unlock(&export->exp_lock);
1080         }
1081         if (targref)
1082                 class_decref(targref, __FUNCTION__, cfs_current());
1083         if (rc)
1084                 req->rq_status = rc;
1085         RETURN(rc);
1086 }
1087
1088 int target_handle_disconnect(struct ptlrpc_request *req)
1089 {
1090         int rc;
1091         ENTRY;
1092
1093         rc = req_capsule_server_pack(&req->rq_pill);
1094         if (rc)
1095                 RETURN(rc);
1096
1097         /* keep the rq_export around so we can send the reply */
1098         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1099
1100         RETURN(0);
1101 }
1102
1103 void target_destroy_export(struct obd_export *exp)
1104 {
1105         /* exports created from last_rcvd data, and "fake"
1106            exports created by lctl don't have an import */
1107         if (exp->exp_imp_reverse != NULL)
1108                 client_destroy_import(exp->exp_imp_reverse);
1109
1110         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1111         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1112         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1113         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1114 }
1115
1116 /*
1117  * Recovery functions
1118  */
1119 static void target_request_copy_get(struct ptlrpc_request *req)
1120 {
1121         class_export_rpc_get(req->rq_export);
1122         LASSERT(cfs_list_empty(&req->rq_list));
1123         CFS_INIT_LIST_HEAD(&req->rq_replay_list);
1124
1125         /* increase refcount to keep request in queue */
1126         cfs_atomic_inc(&req->rq_refcount);
1127         /** let export know it has replays to be handled */
1128         cfs_atomic_inc(&req->rq_export->exp_replay_count);
1129 }
1130
1131 static void target_request_copy_put(struct ptlrpc_request *req)
1132 {
1133         LASSERT(cfs_list_empty(&req->rq_replay_list));
1134         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1135
1136         cfs_atomic_dec(&req->rq_export->exp_replay_count);
1137         class_export_rpc_put(req->rq_export);
1138         ptlrpc_server_drop_request(req);
1139 }
1140
1141 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1142 {
1143         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1144         struct obd_export     *exp = req->rq_export;
1145         struct ptlrpc_request *reqiter;
1146         int                    dup = 0;
1147
1148         LASSERT(exp);
1149
1150         cfs_spin_lock(&exp->exp_lock);
1151         cfs_list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1152                                 rq_replay_list) {
1153                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1154                         dup = 1;
1155                         break;
1156                 }
1157         }
1158
1159         if (dup) {
1160                 /* we expect it with RESENT and REPLAY flags */
1161                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1162                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1163                         CERROR("invalid flags %x of resent replay\n",
1164                                lustre_msg_get_flags(req->rq_reqmsg));
1165         } else {
1166                 cfs_list_add_tail(&req->rq_replay_list,
1167                                   &exp->exp_req_replay_queue);
1168         }
1169
1170         cfs_spin_unlock(&exp->exp_lock);
1171         return dup;
1172 }
1173
1174 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1175 {
1176         LASSERT(!cfs_list_empty(&req->rq_replay_list));
1177         LASSERT(req->rq_export);
1178
1179         cfs_spin_lock(&req->rq_export->exp_lock);
1180         cfs_list_del_init(&req->rq_replay_list);
1181         cfs_spin_unlock(&req->rq_export->exp_lock);
1182 }
1183
1184 #ifdef __KERNEL__
1185 static void target_finish_recovery(struct obd_device *obd)
1186 {
1187         ENTRY;
1188         LCONSOLE_INFO("%s: sending delayed replies to recovered clients\n",
1189                       obd->obd_name);
1190
1191         ldlm_reprocess_all_ns(obd->obd_namespace);
1192         cfs_spin_lock(&obd->obd_recovery_task_lock);
1193         if (!cfs_list_empty(&obd->obd_req_replay_queue) ||
1194             !cfs_list_empty(&obd->obd_lock_replay_queue) ||
1195             !cfs_list_empty(&obd->obd_final_req_queue)) {
1196                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1197                        obd->obd_name,
1198                        cfs_list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1199                        cfs_list_empty(&obd->obd_lock_replay_queue) ? \
1200                                "" : "lock ",
1201                        cfs_list_empty(&obd->obd_final_req_queue) ? \
1202                                "" : "final ");
1203                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1204                 LBUG();
1205         }
1206         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1207
1208         obd->obd_recovery_end = cfs_time_current_sec();
1209
1210         /* when recovery finished, cleanup orphans on mds and ost */
1211         if (OBT(obd) && OBP(obd, postrecov)) {
1212                 int rc = OBP(obd, postrecov)(obd);
1213                 if (rc < 0)
1214                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1215                                       obd->obd_name, rc);
1216         }
1217         EXIT;
1218 }
1219
1220 static void abort_req_replay_queue(struct obd_device *obd)
1221 {
1222         struct ptlrpc_request *req, *n;
1223         cfs_list_t abort_list;
1224
1225         CFS_INIT_LIST_HEAD(&abort_list);
1226         cfs_spin_lock(&obd->obd_recovery_task_lock);
1227         cfs_list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1228         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1229         cfs_list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1230                 DEBUG_REQ(D_WARNING, req, "aborted:");
1231                 req->rq_status = -ENOTCONN;
1232                 if (ptlrpc_error(req)) {
1233                         DEBUG_REQ(D_ERROR, req,
1234                                   "failed abort_req_reply; skipping");
1235                 }
1236                 target_exp_dequeue_req_replay(req);
1237                 target_request_copy_put(req);
1238         }
1239 }
1240
1241 static void abort_lock_replay_queue(struct obd_device *obd)
1242 {
1243         struct ptlrpc_request *req, *n;
1244         cfs_list_t abort_list;
1245
1246         CFS_INIT_LIST_HEAD(&abort_list);
1247         cfs_spin_lock(&obd->obd_recovery_task_lock);
1248         cfs_list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1249         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1250         cfs_list_for_each_entry_safe(req, n, &abort_list, rq_list){
1251                 DEBUG_REQ(D_ERROR, req, "aborted:");
1252                 req->rq_status = -ENOTCONN;
1253                 if (ptlrpc_error(req)) {
1254                         DEBUG_REQ(D_ERROR, req,
1255                                   "failed abort_lock_reply; skipping");
1256                 }
1257                 target_request_copy_put(req);
1258         }
1259 }
1260 #endif
1261
1262 /* Called from a cleanup function if the device is being cleaned up
1263    forcefully.  The exports should all have been disconnected already,
1264    the only thing left to do is
1265      - clear the recovery flags
1266      - cancel the timer
1267      - free queued requests and replies, but don't send replies
1268    Because the obd_stopping flag is set, no new requests should be received.
1269
1270 */
1271 void target_cleanup_recovery(struct obd_device *obd)
1272 {
1273         struct ptlrpc_request *req, *n;
1274         cfs_list_t clean_list;
1275         ENTRY;
1276
1277         CFS_INIT_LIST_HEAD(&clean_list);
1278         cfs_spin_lock(&obd->obd_dev_lock);
1279         if (!obd->obd_recovering) {
1280                 cfs_spin_unlock(&obd->obd_dev_lock);
1281                 EXIT;
1282                 return;
1283         }
1284         obd->obd_recovering = obd->obd_abort_recovery = 0;
1285         cfs_spin_unlock(&obd->obd_dev_lock);
1286
1287         cfs_spin_lock(&obd->obd_recovery_task_lock);
1288         target_cancel_recovery_timer(obd);
1289         cfs_list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1290         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1291
1292         cfs_list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1293                 LASSERT(req->rq_reply_state == 0);
1294                 target_exp_dequeue_req_replay(req);
1295                 target_request_copy_put(req);
1296         }
1297
1298         cfs_spin_lock(&obd->obd_recovery_task_lock);
1299         cfs_list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1300         cfs_list_splice_init(&obd->obd_final_req_queue, &clean_list);
1301         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1302
1303         cfs_list_for_each_entry_safe(req, n, &clean_list, rq_list){
1304                 LASSERT(req->rq_reply_state == 0);
1305                 target_request_copy_put(req);
1306         }
1307
1308         EXIT;
1309 }
1310
1311 /* obd_recovery_task_lock should be held */
1312 void target_cancel_recovery_timer(struct obd_device *obd)
1313 {
1314         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1315         cfs_timer_disarm(&obd->obd_recovery_timer);
1316 }
1317
1318 /* extend = 1 means require at least "duration" seconds left in the timer,
1319    extend = 0 means set the total duration (start_recovery_timer) */
1320 static void reset_recovery_timer(struct obd_device *obd, int duration,
1321                                  int extend)
1322 {
1323         cfs_time_t now = cfs_time_current_sec();
1324         cfs_duration_t left;
1325
1326         cfs_spin_lock(&obd->obd_recovery_task_lock);
1327         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1328                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1329                 return;
1330         }
1331
1332         left = cfs_time_sub(obd->obd_recovery_end, now);
1333
1334         if (extend && (duration > left))
1335                 obd->obd_recovery_timeout += duration - left;
1336         else if (!extend && (duration > obd->obd_recovery_timeout))
1337                 /* Track the client's largest expected replay time */
1338                 obd->obd_recovery_timeout = duration;
1339
1340         /* Hard limit of obd_recovery_time_hard which should not happen */
1341         if (obd->obd_recovery_timeout > obd->obd_recovery_time_hard)
1342                 obd->obd_recovery_timeout = obd->obd_recovery_time_hard;
1343
1344         obd->obd_recovery_end = obd->obd_recovery_start +
1345                                 obd->obd_recovery_timeout;
1346         if (!cfs_timer_is_armed(&obd->obd_recovery_timer) ||
1347             cfs_time_before(now, obd->obd_recovery_end)) {
1348                 left = cfs_time_sub(obd->obd_recovery_end, now);
1349                 cfs_timer_arm(&obd->obd_recovery_timer, cfs_time_shift(left));
1350         }
1351         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1352         CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
1353                obd->obd_name, (unsigned)left);
1354 }
1355
1356 static void check_and_start_recovery_timer(struct obd_device *obd)
1357 {
1358         cfs_spin_lock(&obd->obd_recovery_task_lock);
1359         if (cfs_timer_is_armed(&obd->obd_recovery_timer)) {
1360                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1361                 return;
1362         }
1363         CDEBUG(D_HA, "%s: starting recovery timer\n", obd->obd_name);
1364         obd->obd_recovery_start = cfs_time_current_sec();
1365         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1366
1367         reset_recovery_timer(obd, obd->obd_recovery_timeout, 0);
1368 }
1369
1370 /* Reset the timer with each new client connection */
1371 /*
1372  * This timer is actually reconnect_timer, which is for making sure
1373  * the total recovery window is at least as big as my reconnect
1374  * attempt timing. So the initial recovery time_out will be set to
1375  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1376  * from client is bigger than this, then the recovery time_out will
1377  * be extended to make sure the client could be reconnected, in the
1378  * process, the timeout from the new client should be ignored.
1379  */
1380
1381 static void
1382 target_start_and_reset_recovery_timer(struct obd_device *obd,
1383                                       struct ptlrpc_request *req,
1384                                       int new_client)
1385 {
1386         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1387
1388         if (!new_client && service_time)
1389                 /* Teach server about old server's estimates, as first guess
1390                  * at how long new requests will take. */
1391                 at_measured(&req->rq_rqbd->rqbd_service->srv_at_estimate,
1392                             service_time);
1393
1394         check_and_start_recovery_timer(obd);
1395
1396         /* convert the service time to rpc timeout,
1397          * reuse service_time to limit stack usage */
1398         service_time = at_est2timeout(service_time);
1399
1400         /* We expect other clients to timeout within service_time, then try
1401          * to reconnect, then try the failover server.  The max delay between
1402          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL */
1403         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC +
1404                              INITIAL_CONNECT_TIMEOUT);
1405         if (service_time > obd->obd_recovery_timeout && !new_client)
1406                 reset_recovery_timer(obd, service_time, 0);
1407 }
1408
1409 #ifdef __KERNEL__
1410
1411 /** Health checking routines */
1412 static inline int exp_connect_healthy(struct obd_export *exp)
1413 {
1414         return (exp->exp_in_recovery);
1415 }
1416
1417 /** if export done req_replay or has replay in queue */
1418 static inline int exp_req_replay_healthy(struct obd_export *exp)
1419 {
1420         return (!exp->exp_req_replay_needed ||
1421                 cfs_atomic_read(&exp->exp_replay_count) > 0);
1422 }
1423 /** if export done lock_replay or has replay in queue */
1424 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1425 {
1426         return (!exp->exp_lock_replay_needed ||
1427                 cfs_atomic_read(&exp->exp_replay_count) > 0);
1428 }
1429
1430 static inline int exp_vbr_healthy(struct obd_export *exp)
1431 {
1432         return (!exp->exp_vbr_failed);
1433 }
1434
1435 static inline int exp_finished(struct obd_export *exp)
1436 {
1437         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1438 }
1439
1440 /** Checking routines for recovery */
1441 static int check_for_clients(struct obd_device *obd)
1442 {
1443         if (obd->obd_abort_recovery || obd->obd_recovery_expired)
1444                 return 1;
1445         LASSERT(obd->obd_connected_clients <= obd->obd_max_recoverable_clients);
1446         if (obd->obd_no_conn == 0 &&
1447             obd->obd_connected_clients + obd->obd_stale_clients ==
1448             obd->obd_max_recoverable_clients)
1449                 return 1;
1450         return 0;
1451 }
1452
1453 static int check_for_next_transno(struct obd_device *obd)
1454 {
1455         struct ptlrpc_request *req = NULL;
1456         int wake_up = 0, connected, completed, queue_len;
1457         __u64 next_transno, req_transno;
1458         ENTRY;
1459
1460         cfs_spin_lock(&obd->obd_recovery_task_lock);
1461         if (!cfs_list_empty(&obd->obd_req_replay_queue)) {
1462                 req = cfs_list_entry(obd->obd_req_replay_queue.next,
1463                                      struct ptlrpc_request, rq_list);
1464                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1465         } else {
1466                 req_transno = 0;
1467         }
1468
1469         connected = obd->obd_connected_clients;
1470         completed = connected - cfs_atomic_read(&obd->obd_req_replay_clients);
1471         queue_len = obd->obd_requests_queued_for_recovery;
1472         next_transno = obd->obd_next_recovery_transno;
1473
1474         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1475                "req_transno: "LPU64", next_transno: "LPU64"\n",
1476                obd->obd_max_recoverable_clients, connected, completed,
1477                queue_len, req_transno, next_transno);
1478
1479         if (obd->obd_abort_recovery) {
1480                 CDEBUG(D_HA, "waking for aborted recovery\n");
1481                 wake_up = 1;
1482         } else if (obd->obd_recovery_expired) {
1483                 CDEBUG(D_HA, "waking for expired recovery\n");
1484                 wake_up = 1;
1485         } else if (cfs_atomic_read(&obd->obd_req_replay_clients) == 0) {
1486                 CDEBUG(D_HA, "waking for completed recovery\n");
1487                 wake_up = 1;
1488         } else if (req_transno == next_transno) {
1489                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1490                 wake_up = 1;
1491         } else if (queue_len == cfs_atomic_read(&obd->obd_req_replay_clients)) {
1492                 int d_lvl = D_HA;
1493                 /** handle gaps occured due to lost reply or VBR */
1494                 LASSERTF(req_transno >= next_transno,
1495                          "req_transno: "LPU64", next_transno: "LPU64"\n",
1496                          req_transno, next_transno);
1497                 if (req_transno > obd->obd_last_committed &&
1498                     !obd->obd_version_recov)
1499                         d_lvl = D_ERROR;
1500                 CDEBUG(d_lvl,
1501                        "%s: waking for gap in transno, VBR is %s (skip: "
1502                        LPD64", ql: %d, comp: %d, conn: %d, next: "LPD64
1503                        ", last_committed: "LPD64")\n",
1504                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1505                        next_transno, queue_len, completed, connected,
1506                        req_transno, obd->obd_last_committed);
1507                 obd->obd_next_recovery_transno = req_transno;
1508                 wake_up = 1;
1509         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1510                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1511                        " by fail_lock, waking up ("LPD64")\n", next_transno);
1512                 obd->obd_next_recovery_transno = req_transno;
1513                 wake_up = 1;
1514         }
1515         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1516         return wake_up;
1517 }
1518
1519 static int check_for_next_lock(struct obd_device *obd)
1520 {
1521         int wake_up = 0;
1522
1523         cfs_spin_lock(&obd->obd_recovery_task_lock);
1524         if (!cfs_list_empty(&obd->obd_lock_replay_queue)) {
1525                 CDEBUG(D_HA, "waking for next lock\n");
1526                 wake_up = 1;
1527         } else if (cfs_atomic_read(&obd->obd_lock_replay_clients) == 0) {
1528                 CDEBUG(D_HA, "waking for completed lock replay\n");
1529                 wake_up = 1;
1530         } else if (obd->obd_abort_recovery) {
1531                 CDEBUG(D_HA, "waking for aborted recovery\n");
1532                 wake_up = 1;
1533         } else if (obd->obd_recovery_expired) {
1534                 CDEBUG(D_HA, "waking for expired recovery\n");
1535                 wake_up = 1;
1536         }
1537         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1538
1539         return wake_up;
1540 }
1541
1542 /**
1543  * wait for recovery events,
1544  * check its status with help of check_routine
1545  * evict dead clients via health_check
1546  */
1547 static int target_recovery_overseer(struct obd_device *obd,
1548                                     int (*check_routine)(struct obd_device *),
1549                                     int (*health_check)(struct obd_export *))
1550 {
1551 repeat:
1552         cfs_wait_event(obd->obd_next_transno_waitq, check_routine(obd));
1553         if (obd->obd_abort_recovery) {
1554                 CWARN("recovery is aborted, evict exports in recovery\n");
1555                 /** evict exports which didn't finish recovery yet */
1556                 class_disconnect_stale_exports(obd, exp_finished);
1557                 return 1;
1558         } else if (obd->obd_recovery_expired) {
1559                 obd->obd_recovery_expired = 0;
1560                 /** If some clients died being recovered, evict them */
1561                 CDEBUG(D_WARNING,
1562                        "recovery is timed out, evict stale exports\n");
1563                 /** evict cexports with no replay in queue, they are stalled */
1564                 class_disconnect_stale_exports(obd, health_check);
1565                 /** continue with VBR */
1566                 cfs_spin_lock(&obd->obd_dev_lock);
1567                 obd->obd_version_recov = 1;
1568                 cfs_spin_unlock(&obd->obd_dev_lock);
1569                 /**
1570                  * reset timer, recovery will proceed with versions now,
1571                  * timeout is set just to handle reconnection delays
1572                  */
1573                 reset_recovery_timer(obd, RECONNECT_DELAY_MAX, 1);
1574                 /** Wait for recovery events again, after evicting bad clients */
1575                 goto repeat;
1576         }
1577         return 0;
1578 }
1579
1580 static struct ptlrpc_request *target_next_replay_req(struct obd_device *obd)
1581 {
1582         struct ptlrpc_request *req = NULL;
1583         ENTRY;
1584
1585         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1586                obd->obd_next_recovery_transno);
1587
1588         if (target_recovery_overseer(obd, check_for_next_transno,
1589                                      exp_req_replay_healthy)) {
1590                 abort_req_replay_queue(obd);
1591                 abort_lock_replay_queue(obd);
1592         }
1593
1594         cfs_spin_lock(&obd->obd_recovery_task_lock);
1595         if (!cfs_list_empty(&obd->obd_req_replay_queue)) {
1596                 req = cfs_list_entry(obd->obd_req_replay_queue.next,
1597                                      struct ptlrpc_request, rq_list);
1598                 cfs_list_del_init(&req->rq_list);
1599                 obd->obd_requests_queued_for_recovery--;
1600                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1601         } else {
1602                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1603                 LASSERT(cfs_list_empty(&obd->obd_req_replay_queue));
1604                 LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients) == 0);
1605                 /** evict exports failed VBR */
1606                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1607         }
1608         RETURN(req);
1609 }
1610
1611 static struct ptlrpc_request *target_next_replay_lock(struct obd_device *obd)
1612 {
1613         struct ptlrpc_request *req = NULL;
1614
1615         CDEBUG(D_HA, "Waiting for lock\n");
1616         if (target_recovery_overseer(obd, check_for_next_lock,
1617                                      exp_lock_replay_healthy))
1618                 abort_lock_replay_queue(obd);
1619
1620         cfs_spin_lock(&obd->obd_recovery_task_lock);
1621         if (!cfs_list_empty(&obd->obd_lock_replay_queue)) {
1622                 req = cfs_list_entry(obd->obd_lock_replay_queue.next,
1623                                      struct ptlrpc_request, rq_list);
1624                 cfs_list_del_init(&req->rq_list);
1625                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1626         } else {
1627                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1628                 LASSERT(cfs_list_empty(&obd->obd_lock_replay_queue));
1629                 LASSERT(cfs_atomic_read(&obd->obd_lock_replay_clients) == 0);
1630                 /** evict exports failed VBR */
1631                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1632         }
1633         return req;
1634 }
1635
1636 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
1637 {
1638         struct ptlrpc_request *req = NULL;
1639
1640         cfs_spin_lock(&obd->obd_recovery_task_lock);
1641         if (!cfs_list_empty(&obd->obd_final_req_queue)) {
1642                 req = cfs_list_entry(obd->obd_final_req_queue.next,
1643                                      struct ptlrpc_request, rq_list);
1644                 cfs_list_del_init(&req->rq_list);
1645                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1646                 if (req->rq_export->exp_in_recovery) {
1647                         cfs_spin_lock(&req->rq_export->exp_lock);
1648                         req->rq_export->exp_in_recovery = 0;
1649                         cfs_spin_unlock(&req->rq_export->exp_lock);
1650                 }
1651         } else {
1652                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1653         }
1654         return req;
1655 }
1656
1657 static int handle_recovery_req(struct ptlrpc_thread *thread,
1658                                struct ptlrpc_request *req,
1659                                svc_handler_t handler)
1660 {
1661         int rc;
1662         ENTRY;
1663
1664         /**
1665          * export can be evicted during recovery, no need to handle replays for
1666          * it after that, discard such request silently
1667          */
1668         if (req->rq_export->exp_disconnected)
1669                 GOTO(reqcopy_put, rc = 0);
1670
1671         rc = lu_context_init(&req->rq_recov_session, LCT_SESSION);
1672         if (rc) {
1673                 CERROR("Failure to initialize session: %d\n", rc);
1674                 GOTO(reqcopy_put, rc);
1675         }
1676
1677         req->rq_recov_session.lc_thread = thread;
1678         lu_context_enter(&req->rq_recov_session);
1679         req->rq_svc_thread = thread;
1680         req->rq_svc_thread->t_env->le_ses = &req->rq_recov_session;
1681
1682         /* thread context */
1683         lu_context_enter(&thread->t_env->le_ctx);
1684         (void)handler(req);
1685         lu_context_exit(&thread->t_env->le_ctx);
1686
1687         lu_context_exit(&req->rq_recov_session);
1688         lu_context_fini(&req->rq_recov_session);
1689         /* don't reset timer for final stage */
1690         if (!exp_finished(req->rq_export)) {
1691                 /**
1692                  * Add request timeout to the recovery time so next request from
1693                  * this client may come in recovery time
1694                  */
1695                  reset_recovery_timer(class_exp2obd(req->rq_export),
1696                                       AT_OFF ? obd_timeout :
1697                                       lustre_msg_get_timeout(req->rq_reqmsg), 1);
1698         }
1699 reqcopy_put:
1700         RETURN(rc);
1701 }
1702
1703 static int target_recovery_thread(void *arg)
1704 {
1705         struct lu_target *lut = arg;
1706         struct obd_device *obd = lut->lut_obd;
1707         struct ptlrpc_request *req;
1708         struct target_recovery_data *trd = &obd->obd_recovery_data;
1709         unsigned long delta;
1710         unsigned long flags;
1711         struct lu_env env;
1712         struct ptlrpc_thread fake_svc_thread, *thread = &fake_svc_thread;
1713         int rc = 0;
1714         ENTRY;
1715
1716         cfs_daemonize_ctxt("tgt_recov");
1717
1718         SIGNAL_MASK_LOCK(current, flags);
1719         sigfillset(&current->blocked);
1720         RECALC_SIGPENDING;
1721         SIGNAL_MASK_UNLOCK(current, flags);
1722
1723         rc = lu_context_init(&env.le_ctx, LCT_MD_THREAD);
1724         if (rc)
1725                 RETURN(rc);
1726
1727         thread->t_env = &env;
1728         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
1729         env.le_ctx.lc_thread = thread;
1730         thread->t_data = NULL;
1731
1732         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
1733                cfs_curproc_pid());
1734         trd->trd_processing_task = cfs_curproc_pid();
1735
1736         cfs_spin_lock(&obd->obd_dev_lock);
1737         obd->obd_recovering = 1;
1738         cfs_spin_unlock(&obd->obd_dev_lock);
1739         cfs_complete(&trd->trd_starting);
1740
1741         /* first of all, we have to know the first transno to replay */
1742         if (target_recovery_overseer(obd, check_for_clients,
1743                                      exp_connect_healthy)) {
1744                 abort_req_replay_queue(obd);
1745                 abort_lock_replay_queue(obd);
1746         }
1747
1748         /* next stage: replay requests */
1749         delta = jiffies;
1750         CDEBUG(D_INFO, "1: request replay stage - %d clients from t"LPU64"\n",
1751                cfs_atomic_read(&obd->obd_req_replay_clients),
1752                obd->obd_next_recovery_transno);
1753         while ((req = target_next_replay_req(obd))) {
1754                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1755                 DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s",
1756                           lustre_msg_get_transno(req->rq_reqmsg),
1757                           libcfs_nid2str(req->rq_peer.nid));
1758                 handle_recovery_req(thread, req,
1759                                     trd->trd_recovery_handler);
1760                 /**
1761                  * bz18031: increase next_recovery_transno before
1762                  * target_request_copy_put() will drop exp_rpc reference
1763                  */
1764                 cfs_spin_lock(&obd->obd_recovery_task_lock);
1765                 obd->obd_next_recovery_transno++;
1766                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1767                 target_exp_dequeue_req_replay(req);
1768                 target_request_copy_put(req);
1769                 obd->obd_replayed_requests++;
1770         }
1771
1772         /**
1773          * The second stage: replay locks
1774          */
1775         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
1776                cfs_atomic_read(&obd->obd_lock_replay_clients));
1777         while ((req = target_next_replay_lock(obd))) {
1778                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1779                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
1780                           libcfs_nid2str(req->rq_peer.nid));
1781                 handle_recovery_req(thread, req,
1782                                     trd->trd_recovery_handler);
1783                 target_request_copy_put(req);
1784                 obd->obd_replayed_locks++;
1785         }
1786
1787         /**
1788          * The third stage: reply on final pings, at this moment all clients
1789          * must have request in final queue
1790          */
1791         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
1792         /** Update server last boot epoch */
1793         lut_boot_epoch_update(lut);
1794         /* We drop recoverying flag to forward all new requests
1795          * to regular mds_handle() since now */
1796         cfs_spin_lock(&obd->obd_dev_lock);
1797         obd->obd_recovering = obd->obd_abort_recovery = 0;
1798         cfs_spin_unlock(&obd->obd_dev_lock);
1799         cfs_spin_lock(&obd->obd_recovery_task_lock);
1800         target_cancel_recovery_timer(obd);
1801         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1802         while ((req = target_next_final_ping(obd))) {
1803                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1804                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
1805                           libcfs_nid2str(req->rq_peer.nid));
1806                 handle_recovery_req(thread, req,
1807                                     trd->trd_recovery_handler);
1808                 target_request_copy_put(req);
1809         }
1810
1811         delta = (jiffies - delta) / CFS_HZ;
1812         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
1813               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
1814         if (delta > OBD_RECOVERY_TIME_SOFT) {
1815                 CWARN("too long recovery - read logs\n");
1816                 libcfs_debug_dumplog();
1817         }
1818
1819         target_finish_recovery(obd);
1820
1821         lu_context_fini(&env.le_ctx);
1822         trd->trd_processing_task = 0;
1823         cfs_complete(&trd->trd_finishing);
1824         RETURN(rc);
1825 }
1826
1827 static int target_start_recovery_thread(struct lu_target *lut,
1828                                         svc_handler_t handler)
1829 {
1830         struct obd_device *obd = lut->lut_obd;
1831         int rc = 0;
1832         struct target_recovery_data *trd = &obd->obd_recovery_data;
1833
1834         memset(trd, 0, sizeof(*trd));
1835         cfs_init_completion(&trd->trd_starting);
1836         cfs_init_completion(&trd->trd_finishing);
1837         trd->trd_recovery_handler = handler;
1838
1839         if (cfs_create_thread(target_recovery_thread, lut, 0) > 0) {
1840                 cfs_wait_for_completion(&trd->trd_starting);
1841                 LASSERT(obd->obd_recovering != 0);
1842         } else
1843                 rc = -ECHILD;
1844
1845         return rc;
1846 }
1847
1848 void target_stop_recovery_thread(struct obd_device *obd)
1849 {
1850         if (obd->obd_recovery_data.trd_processing_task > 0) {
1851                 struct target_recovery_data *trd = &obd->obd_recovery_data;
1852                 /** recovery can be done but postrecovery is not yet */
1853                 cfs_spin_lock(&obd->obd_dev_lock);
1854                 if (obd->obd_recovering) {
1855                         CERROR("%s: Aborting recovery\n", obd->obd_name);
1856                         obd->obd_abort_recovery = 1;
1857                         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1858                 }
1859                 cfs_spin_unlock(&obd->obd_dev_lock);
1860                 cfs_wait_for_completion(&trd->trd_finishing);
1861         }
1862 }
1863
1864 void target_recovery_fini(struct obd_device *obd)
1865 {
1866         class_disconnect_exports(obd);
1867         target_stop_recovery_thread(obd);
1868         target_cleanup_recovery(obd);
1869 }
1870 EXPORT_SYMBOL(target_recovery_fini);
1871
1872 static void target_recovery_expired(unsigned long castmeharder)
1873 {
1874         struct obd_device *obd = (struct obd_device *)castmeharder;
1875         CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
1876                " after %lds (%d clients connected)\n",
1877                obd->obd_name, cfs_atomic_read(&obd->obd_lock_replay_clients),
1878                cfs_time_current_sec()- obd->obd_recovery_start,
1879                obd->obd_connected_clients);
1880
1881         obd->obd_recovery_expired = 1;
1882         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1883 }
1884
1885 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
1886 {
1887         struct obd_device *obd = lut->lut_obd;
1888         if (obd->obd_max_recoverable_clients == 0) {
1889                 /** Update server last boot epoch */
1890                 lut_boot_epoch_update(lut);
1891                 return;
1892         }
1893
1894         CWARN("RECOVERY: service %s, %d recoverable clients, "
1895               "last_transno "LPU64"\n", obd->obd_name,
1896               obd->obd_max_recoverable_clients, obd->obd_last_committed);
1897         LASSERT(obd->obd_stopping == 0);
1898         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
1899         obd->obd_recovery_start = 0;
1900         obd->obd_recovery_end = 0;
1901
1902         /* both values can be get from mount data already */
1903         if (obd->obd_recovery_timeout == 0)
1904                 obd->obd_recovery_timeout = OBD_RECOVERY_TIME_SOFT;
1905         if (obd->obd_recovery_time_hard == 0)
1906                 obd->obd_recovery_time_hard = OBD_RECOVERY_TIME_HARD;
1907         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
1908         target_start_recovery_thread(lut, handler);
1909 }
1910 EXPORT_SYMBOL(target_recovery_init);
1911
1912 #endif
1913
1914 static int target_process_req_flags(struct obd_device *obd,
1915                                     struct ptlrpc_request *req)
1916 {
1917         struct obd_export *exp = req->rq_export;
1918         LASSERT(exp != NULL);
1919         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1920                 /* client declares he's ready to replay locks */
1921                 cfs_spin_lock(&exp->exp_lock);
1922                 if (exp->exp_req_replay_needed) {
1923                         exp->exp_req_replay_needed = 0;
1924                         cfs_spin_unlock(&exp->exp_lock);
1925
1926                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
1927                         cfs_atomic_dec(&obd->obd_req_replay_clients);
1928                 } else {
1929                         cfs_spin_unlock(&exp->exp_lock);
1930                 }
1931         }
1932         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1933                 /* client declares he's ready to complete recovery
1934                  * so, we put the request on th final queue */
1935                 cfs_spin_lock(&exp->exp_lock);
1936                 if (exp->exp_lock_replay_needed) {
1937                         exp->exp_lock_replay_needed = 0;
1938                         cfs_spin_unlock(&exp->exp_lock);
1939
1940                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
1941                         cfs_atomic_dec(&obd->obd_lock_replay_clients);
1942                 } else {
1943                         cfs_spin_unlock(&exp->exp_lock);
1944                 }
1945         }
1946         return 0;
1947 }
1948
1949 int target_queue_recovery_request(struct ptlrpc_request *req,
1950                                   struct obd_device *obd)
1951 {
1952         cfs_list_t *tmp;
1953         int inserted = 0;
1954         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1955         ENTRY;
1956
1957         if (obd->obd_recovery_data.trd_processing_task == cfs_curproc_pid()) {
1958                 /* Processing the queue right now, don't re-add. */
1959                 RETURN(1);
1960         }
1961
1962         target_process_req_flags(obd, req);
1963
1964         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1965                 /* client declares he's ready to complete recovery
1966                  * so, we put the request on th final queue */
1967                 target_request_copy_get(req);
1968                 DEBUG_REQ(D_HA, req, "queue final req");
1969                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1970                 cfs_spin_lock(&obd->obd_recovery_task_lock);
1971                 if (obd->obd_recovering) {
1972                         cfs_list_add_tail(&req->rq_list,
1973                                           &obd->obd_final_req_queue);
1974                 } else {
1975                         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1976                         target_request_copy_put(req);
1977                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
1978                 }
1979                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1980                 RETURN(0);
1981         }
1982         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1983                 /* client declares he's ready to replay locks */
1984                 target_request_copy_get(req);
1985                 DEBUG_REQ(D_HA, req, "queue lock replay req");
1986                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1987                 cfs_spin_lock(&obd->obd_recovery_task_lock);
1988                 LASSERT(obd->obd_recovering);
1989                 /* usually due to recovery abort */
1990                 if (!req->rq_export->exp_in_recovery) {
1991                         cfs_spin_unlock(&obd->obd_recovery_task_lock);
1992                         target_request_copy_put(req);
1993                         RETURN(-ENOTCONN);
1994                 }
1995                 LASSERT(req->rq_export->exp_lock_replay_needed);
1996                 cfs_list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
1997                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
1998                 RETURN(0);
1999         }
2000
2001         /* CAVEAT EMPTOR: The incoming request message has been swabbed
2002          * (i.e. buflens etc are in my own byte order), but type-dependent
2003          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
2004
2005         if (!transno) {
2006                 CFS_INIT_LIST_HEAD(&req->rq_list);
2007                 DEBUG_REQ(D_HA, req, "not queueing");
2008                 RETURN(1);
2009         }
2010
2011         /* If we're processing the queue, we want don't want to queue this
2012          * message.
2013          *
2014          * Also, if this request has a transno less than the one we're waiting
2015          * for, we should process it now.  It could (and currently always will)
2016          * be an open request for a descriptor that was opened some time ago.
2017          *
2018          * Also, a resent, replayed request that has already been
2019          * handled will pass through here and be processed immediately.
2020          */
2021         CWARN("Next recovery transno: "LPU64", current: "LPU64", replaying\n",
2022               obd->obd_next_recovery_transno, transno);
2023         cfs_spin_lock(&obd->obd_recovery_task_lock);
2024         if (transno < obd->obd_next_recovery_transno) {
2025                 /* Processing the queue right now, don't re-add. */
2026                 LASSERT(cfs_list_empty(&req->rq_list));
2027                 cfs_spin_unlock(&obd->obd_recovery_task_lock);
2028                 RETURN(1);
2029         }
2030         cfs_spin_unlock(&obd->obd_recovery_task_lock);
2031
2032         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2033                 RETURN(0);
2034
2035         target_request_copy_get(req);
2036         if (!req->rq_export->exp_in_recovery) {
2037                 target_request_copy_put(req);
2038                 RETURN(-ENOTCONN);
2039         }
2040         LASSERT(req->rq_export->exp_req_replay_needed);
2041
2042         if (target_exp_enqueue_req_replay(req)) {
2043                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2044                 target_request_copy_put(req);
2045                 RETURN(0);
2046         }
2047
2048         /* XXX O(n^2) */
2049         cfs_spin_lock(&obd->obd_recovery_task_lock);
2050         LASSERT(obd->obd_recovering);
2051         cfs_list_for_each(tmp, &obd->obd_req_replay_queue) {
2052                 struct ptlrpc_request *reqiter =
2053                         cfs_list_entry(tmp, struct ptlrpc_request, rq_list);
2054
2055                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2056                         cfs_list_add_tail(&req->rq_list, &reqiter->rq_list);
2057                         inserted = 1;
2058                         break;
2059                 }
2060
2061                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2062                              transno)) {
2063                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2064                                   "has been claimed by another client");
2065                         cfs_spin_unlock(&obd->obd_recovery_task_lock);
2066                         target_exp_dequeue_req_replay(req);
2067                         target_request_copy_put(req);
2068                         RETURN(0);
2069                 }
2070         }
2071
2072         if (!inserted)
2073                 cfs_list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2074
2075         obd->obd_requests_queued_for_recovery++;
2076         cfs_spin_unlock(&obd->obd_recovery_task_lock);
2077         cfs_waitq_signal(&obd->obd_next_transno_waitq);
2078         RETURN(0);
2079 }
2080
2081 /**
2082  * Packs current SLV and Limit into \a req.
2083  */
2084 int target_pack_pool_reply(struct ptlrpc_request *req)
2085 {
2086         struct obd_device *obd;
2087         ENTRY;
2088
2089         /*
2090          * Check that we still have all structures alive as this may
2091          * be some late rpc in shutdown time.
2092          */
2093         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2094                      !exp_connect_lru_resize(req->rq_export))) {
2095                 lustre_msg_set_slv(req->rq_repmsg, 0);
2096                 lustre_msg_set_limit(req->rq_repmsg, 0);
2097                 RETURN(0);
2098         }
2099
2100         /*
2101          * OBD is alive here as export is alive, which we checked above.
2102          */
2103         obd = req->rq_export->exp_obd;
2104
2105         cfs_read_lock(&obd->obd_pool_lock);
2106         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2107         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2108         cfs_read_unlock(&obd->obd_pool_lock);
2109
2110         RETURN(0);
2111 }
2112
2113 int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
2114 {
2115         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2116                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2117                 return (-ECOMM);
2118         }
2119
2120         if (unlikely(rc)) {
2121                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
2122                 req->rq_status = rc;
2123                 return (ptlrpc_send_error(req, 1));
2124         } else {
2125                 DEBUG_REQ(D_NET, req, "sending reply");
2126         }
2127
2128         return (ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT));
2129 }
2130
2131 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2132 {
2133         int                        netrc;
2134         struct ptlrpc_reply_state *rs;
2135         struct obd_device         *obd;
2136         struct obd_export         *exp;
2137         struct ptlrpc_service     *svc;
2138         ENTRY;
2139
2140         if (req->rq_no_reply) {
2141                 EXIT;
2142                 return;
2143         }
2144
2145         svc = req->rq_rqbd->rqbd_service;
2146         rs = req->rq_reply_state;
2147         if (rs == NULL || !rs->rs_difficult) {
2148                 /* no notifiers */
2149                 target_send_reply_msg (req, rc, fail_id);
2150                 EXIT;
2151                 return;
2152         }
2153
2154         /* must be an export if locks saved */
2155         LASSERT (req->rq_export != NULL);
2156         /* req/reply consistent */
2157         LASSERT (rs->rs_service == svc);
2158
2159         /* "fresh" reply */
2160         LASSERT (!rs->rs_scheduled);
2161         LASSERT (!rs->rs_scheduled_ever);
2162         LASSERT (!rs->rs_handled);
2163         LASSERT (!rs->rs_on_net);
2164         LASSERT (rs->rs_export == NULL);
2165         LASSERT (cfs_list_empty(&rs->rs_obd_list));
2166         LASSERT (cfs_list_empty(&rs->rs_exp_list));
2167
2168         exp = class_export_get (req->rq_export);
2169         obd = exp->exp_obd;
2170
2171         /* disable reply scheduling while I'm setting up */
2172         rs->rs_scheduled = 1;
2173         rs->rs_on_net    = 1;
2174         rs->rs_xid       = req->rq_xid;
2175         rs->rs_transno   = req->rq_transno;
2176         rs->rs_export    = exp;
2177         rs->rs_opc       = lustre_msg_get_opc(rs->rs_msg);
2178
2179         cfs_spin_lock(&exp->exp_uncommitted_replies_lock);
2180         CDEBUG(D_NET, "rs transno = "LPU64", last committed = "LPU64"\n",
2181                rs->rs_transno, exp->exp_last_committed);
2182         if (rs->rs_transno > exp->exp_last_committed) {
2183                 /* not committed already */
2184                 cfs_list_add_tail(&rs->rs_obd_list,
2185                                   &exp->exp_uncommitted_replies);
2186         }
2187         cfs_spin_unlock (&exp->exp_uncommitted_replies_lock);
2188
2189         cfs_spin_lock(&exp->exp_lock);
2190         cfs_list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
2191         cfs_spin_unlock(&exp->exp_lock);
2192
2193         netrc = target_send_reply_msg (req, rc, fail_id);
2194
2195         cfs_spin_lock(&svc->srv_rs_lock);
2196
2197         cfs_atomic_inc(&svc->srv_n_difficult_replies);
2198
2199         if (netrc != 0) {
2200                 /* error sending: reply is off the net.  Also we need +1
2201                  * reply ref until ptlrpc_handle_rs() is done
2202                  * with the reply state (if the send was successful, there
2203                  * would have been +1 ref for the net, which
2204                  * reply_out_callback leaves alone) */
2205                 rs->rs_on_net = 0;
2206                 ptlrpc_rs_addref(rs);
2207         }
2208
2209         cfs_spin_lock(&rs->rs_lock);
2210         if (rs->rs_transno <= exp->exp_last_committed ||
2211             (!rs->rs_on_net && !rs->rs_no_ack) ||
2212              cfs_list_empty(&rs->rs_exp_list) ||     /* completed already */
2213              cfs_list_empty(&rs->rs_obd_list)) {
2214                 CDEBUG(D_HA, "Schedule reply immediately\n");
2215                 ptlrpc_dispatch_difficult_reply(rs);
2216         } else {
2217                 cfs_list_add (&rs->rs_list, &svc->srv_active_replies);
2218                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
2219         }
2220         cfs_spin_unlock(&rs->rs_lock);
2221         cfs_spin_unlock(&svc->srv_rs_lock);
2222         EXIT;
2223 }
2224
2225 int target_handle_ping(struct ptlrpc_request *req)
2226 {
2227         obd_ping(req->rq_export);
2228         return req_capsule_server_pack(&req->rq_pill);
2229 }
2230
2231 void target_committed_to_req(struct ptlrpc_request *req)
2232 {
2233         struct obd_export *exp = req->rq_export;
2234
2235         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2236                 lustre_msg_set_last_committed(req->rq_repmsg,
2237                                               exp->exp_last_committed);
2238         else
2239                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2240                           "%d)", exp->exp_obd->obd_no_transno,
2241                           req->rq_repmsg == NULL);
2242
2243         CDEBUG(D_INFO, "last_committed "LPU64", transno "LPU64", xid "LPU64"\n",
2244                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2245 }
2246 EXPORT_SYMBOL(target_committed_to_req);
2247
2248 int target_handle_qc_callback(struct ptlrpc_request *req)
2249 {
2250         struct obd_quotactl *oqctl;
2251         struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
2252
2253         oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2254         if (oqctl == NULL) {
2255                 CERROR("Can't unpack obd_quotactl\n");
2256                 RETURN(-EPROTO);
2257         }
2258
2259         cli->cl_qchk_stat = oqctl->qc_stat;
2260
2261         return 0;
2262 }
2263
2264 #ifdef HAVE_QUOTA_SUPPORT
2265 int target_handle_dqacq_callback(struct ptlrpc_request *req)
2266 {
2267 #ifdef __KERNEL__
2268         struct obd_device *obd = req->rq_export->exp_obd;
2269         struct obd_device *master_obd = NULL, *lov_obd = NULL;
2270         struct obd_device_target *obt;
2271         struct lustre_quota_ctxt *qctxt;
2272         struct qunit_data *qdata = NULL;
2273         int rc = 0;
2274         ENTRY;
2275
2276         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_DROP_QUOTA_REQ))
2277                 RETURN(rc);
2278
2279         rc = req_capsule_server_pack(&req->rq_pill);
2280         if (rc) {
2281                 CERROR("packing reply failed!: rc = %d\n", rc);
2282                 RETURN(rc);
2283         }
2284
2285         LASSERT(req->rq_export);
2286
2287         qdata = quota_get_qdata(req, QUOTA_REQUEST, QUOTA_EXPORT);
2288         if (IS_ERR(qdata)) {
2289                 rc = PTR_ERR(qdata);
2290                 CDEBUG(D_ERROR, "Can't unpack qunit_data(rc: %d)\n", rc);
2291                 req->rq_status = rc;
2292                 GOTO(out, rc);
2293         }
2294
2295         /* we use the observer */
2296         if (obd_pin_observer(obd, &lov_obd) ||
2297             obd_pin_observer(lov_obd, &master_obd)) {
2298                 CERROR("Can't find the observer, it is recovering\n");
2299                 req->rq_status = -EAGAIN;
2300                 GOTO(out, rc);
2301         }
2302
2303         obt = &master_obd->u.obt;
2304         qctxt = &obt->obt_qctxt;
2305
2306         if (!qctxt->lqc_setup || !qctxt->lqc_valid) {
2307                 /* quota_type has not been processed yet, return EAGAIN
2308                  * until we know whether or not quotas are supposed to
2309                  * be enabled */
2310                 CDEBUG(D_QUOTA, "quota_type not processed yet, return "
2311                        "-EAGAIN\n");
2312                 req->rq_status = -EAGAIN;
2313                 GOTO(out, rc);
2314         }
2315
2316         cfs_down_read(&obt->obt_rwsem);
2317         if (qctxt->lqc_lqs_hash == NULL) {
2318                 cfs_up_read(&obt->obt_rwsem);
2319                 /* quota_type has not been processed yet, return EAGAIN
2320                  * until we know whether or not quotas are supposed to
2321                  * be enabled */
2322                 CDEBUG(D_QUOTA, "quota_ctxt is not ready yet, return "
2323                        "-EAGAIN\n");
2324                 req->rq_status = -EAGAIN;
2325                 GOTO(out, rc);
2326         }
2327
2328         LASSERT(qctxt->lqc_handler);
2329         rc = qctxt->lqc_handler(master_obd, qdata,
2330                                 lustre_msg_get_opc(req->rq_reqmsg));
2331         cfs_up_read(&obt->obt_rwsem);
2332         if (rc && rc != -EDQUOT)
2333                 CDEBUG(rc == -EBUSY  ? D_QUOTA : D_ERROR,
2334                        "dqacq/dqrel failed! (rc:%d)\n", rc);
2335         req->rq_status = rc;
2336
2337         rc = quota_copy_qdata(req, qdata, QUOTA_REPLY, QUOTA_EXPORT);
2338         if (rc < 0) {
2339                 CERROR("Can't pack qunit_data(rc: %d)\n", rc);
2340                 GOTO(out, rc);
2341         }
2342
2343         /* Block the quota req. b=14840 */
2344         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_BLOCK_QUOTA_REQ, obd_timeout);
2345         EXIT;
2346
2347 out:
2348         if (master_obd)
2349                 obd_unpin_observer(lov_obd);
2350         if (lov_obd)
2351                 obd_unpin_observer(obd);
2352
2353         rc = ptlrpc_reply(req);
2354         return rc;
2355 #else
2356         return 0;
2357 #endif /* !__KERNEL__ */
2358 }
2359 #endif /* HAVE_QUOTA_SUPPORT */
2360
2361 ldlm_mode_t lck_compat_array[] = {
2362         [LCK_EX] LCK_COMPAT_EX,
2363         [LCK_PW] LCK_COMPAT_PW,
2364         [LCK_PR] LCK_COMPAT_PR,
2365         [LCK_CW] LCK_COMPAT_CW,
2366         [LCK_CR] LCK_COMPAT_CR,
2367         [LCK_NL] LCK_COMPAT_NL,
2368         [LCK_GROUP] LCK_COMPAT_GROUP,
2369         [LCK_COS] LCK_COMPAT_COS,
2370 };
2371
2372 /**
2373  * Rather arbitrary mapping from LDLM error codes to errno values. This should
2374  * not escape to the user level.
2375  */
2376 int ldlm_error2errno(ldlm_error_t error)
2377 {
2378         int result;
2379
2380         switch (error) {
2381         case ELDLM_OK:
2382                 result = 0;
2383                 break;
2384         case ELDLM_LOCK_CHANGED:
2385                 result = -ESTALE;
2386                 break;
2387         case ELDLM_LOCK_ABORTED:
2388                 result = -ENAVAIL;
2389                 break;
2390         case ELDLM_LOCK_REPLACED:
2391                 result = -ESRCH;
2392                 break;
2393         case ELDLM_NO_LOCK_DATA:
2394                 result = -ENOENT;
2395                 break;
2396         case ELDLM_NAMESPACE_EXISTS:
2397                 result = -EEXIST;
2398                 break;
2399         case ELDLM_BAD_NAMESPACE:
2400                 result = -EBADF;
2401                 break;
2402         default:
2403                 if (((int)error) < 0)  /* cast to signed type */
2404                         result = error; /* as ldlm_error_t can be unsigned */
2405                 else {
2406                         CERROR("Invalid DLM result code: %d\n", error);
2407                         result = -EPROTO;
2408                 }
2409         }
2410         return result;
2411 }
2412 EXPORT_SYMBOL(ldlm_error2errno);
2413
2414 /**
2415  * Dual to ldlm_error2errno(): maps errno values back to ldlm_error_t.
2416  */
2417 ldlm_error_t ldlm_errno2error(int err_no)
2418 {
2419         int error;
2420
2421         switch (err_no) {
2422         case 0:
2423                 error = ELDLM_OK;
2424                 break;
2425         case -ESTALE:
2426                 error = ELDLM_LOCK_CHANGED;
2427                 break;
2428         case -ENAVAIL:
2429                 error = ELDLM_LOCK_ABORTED;
2430                 break;
2431         case -ESRCH:
2432                 error = ELDLM_LOCK_REPLACED;
2433                 break;
2434         case -ENOENT:
2435                 error = ELDLM_NO_LOCK_DATA;
2436                 break;
2437         case -EEXIST:
2438                 error = ELDLM_NAMESPACE_EXISTS;
2439                 break;
2440         case -EBADF:
2441                 error = ELDLM_BAD_NAMESPACE;
2442                 break;
2443         default:
2444                 error = err_no;
2445         }
2446         return error;
2447 }
2448 EXPORT_SYMBOL(ldlm_errno2error);
2449
2450 #if LUSTRE_TRACKS_LOCK_EXP_REFS
2451 void ldlm_dump_export_locks(struct obd_export *exp)
2452 {
2453         cfs_spin_lock(&exp->exp_locks_list_guard);
2454         if (!cfs_list_empty(&exp->exp_locks_list)) {
2455             struct ldlm_lock *lock;
2456
2457             CERROR("dumping locks for export %p,"
2458                    "ignore if the unmount doesn't hang\n", exp);
2459             cfs_list_for_each_entry(lock, &exp->exp_locks_list, l_exp_refs_link)
2460                 ldlm_lock_dump(D_ERROR, lock, 0);
2461         }
2462         cfs_spin_unlock(&exp->exp_locks_list_guard);
2463 }
2464 #endif
2465
2466 static int target_bulk_timeout(void *data)
2467 {
2468         ENTRY;
2469         /* We don't fail the connection here, because having the export
2470          * killed makes the (vital) call to commitrw very sad.
2471          */
2472         RETURN(1);
2473 }
2474
2475 static inline char *bulk2type(struct ptlrpc_bulk_desc *desc)
2476 {
2477         return desc->bd_type == BULK_GET_SINK ? "GET" : "PUT";
2478 }
2479
2480 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc,
2481                    struct l_wait_info *lwi)
2482 {
2483         struct ptlrpc_request *req = desc->bd_req;
2484         int rc = 0;
2485         ENTRY;
2486
2487         /* Check if there is eviction in progress, and if so, wait for
2488          * it to finish */
2489         if (unlikely(cfs_atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
2490                 *lwi = LWI_INTR(NULL, NULL);
2491                 rc = l_wait_event(exp->exp_obd->obd_evict_inprogress_waitq,
2492                                   !cfs_atomic_read(&exp->exp_obd->
2493                                                    obd_evict_inprogress),
2494                                   lwi);
2495         }
2496
2497         /* Check if client was evicted or tried to reconnect already */
2498         if (exp->exp_failed || exp->exp_abort_active_req) {
2499                 rc = -ENOTCONN;
2500         } else {
2501                 if (desc->bd_type == BULK_PUT_SINK)
2502                         rc = sptlrpc_svc_wrap_bulk(req, desc);
2503                 if (rc == 0)
2504                         rc = ptlrpc_start_bulk_transfer(desc);
2505         }
2506
2507         if (rc == 0 && OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
2508                 ptlrpc_abort_bulk(desc);
2509         } else if (rc == 0) {
2510                 time_t start = cfs_time_current_sec();
2511                 do {
2512                         long timeoutl = req->rq_deadline - cfs_time_current_sec();
2513                         cfs_duration_t timeout = timeoutl <= 0 ?
2514                                 CFS_TICK : cfs_time_seconds(timeoutl);
2515                         *lwi = LWI_TIMEOUT_INTERVAL(timeout,
2516                                                     cfs_time_seconds(1),
2517                                                    target_bulk_timeout,
2518                                                    desc);
2519                         rc = l_wait_event(desc->bd_waitq,
2520                                           !ptlrpc_server_bulk_active(desc) ||
2521                                           exp->exp_failed ||
2522                                           exp->exp_abort_active_req,
2523                                           lwi);
2524                         LASSERT(rc == 0 || rc == -ETIMEDOUT);
2525                         /* Wait again if we changed deadline */
2526                 } while ((rc == -ETIMEDOUT) &&
2527                          (req->rq_deadline > cfs_time_current_sec()));
2528
2529                 if (rc == -ETIMEDOUT) {
2530                         DEBUG_REQ(D_ERROR, req,
2531                                   "timeout on bulk %s after %ld%+lds",
2532                                   bulk2type(desc),
2533                                   req->rq_deadline - start,
2534                                   cfs_time_current_sec() -
2535                                   req->rq_deadline);
2536                         ptlrpc_abort_bulk(desc);
2537                 } else if (exp->exp_failed) {
2538                         DEBUG_REQ(D_ERROR, req, "Eviction on bulk %s",
2539                                   bulk2type(desc));
2540                         rc = -ENOTCONN;
2541                         ptlrpc_abort_bulk(desc);
2542                 } else if (exp->exp_abort_active_req) {
2543                         DEBUG_REQ(D_ERROR, req, "Reconnect on bulk %s",
2544                                   bulk2type(desc));
2545                         /* we don't reply anyway */
2546                         rc = -ETIMEDOUT;
2547                         ptlrpc_abort_bulk(desc);
2548                 } else if (!desc->bd_success ||
2549                            desc->bd_nob_transferred != desc->bd_nob) {
2550                         DEBUG_REQ(D_ERROR, req, "%s bulk %s %d(%d)",
2551                                   desc->bd_success ?
2552                                   "truncated" : "network error on",
2553                                   bulk2type(desc),
2554                                   desc->bd_nob_transferred,
2555                                   desc->bd_nob);
2556                         /* XXX should this be a different errno? */
2557                         rc = -ETIMEDOUT;
2558                 } else if (desc->bd_type == BULK_GET_SINK) {
2559                         rc = sptlrpc_svc_unwrap_bulk(req, desc);
2560                 }
2561         } else {
2562                 DEBUG_REQ(D_ERROR, req, "bulk %s failed: rc %d",
2563                           bulk2type(desc), rc);
2564         }
2565
2566         RETURN(rc);
2567 }
2568 EXPORT_SYMBOL(target_bulk_io);