lustre/ldlm/ldlm_lib.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2010, 2015, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 /**
  34  * This file deals with various client/target related logic including recovery.
  35  *
  36  * TODO: This code more logically belongs in the ptlrpc module than in ldlm and
  37  * should be moved.
  38  */
  39
  40 #define DEBUG_SUBSYSTEM S_LDLM
  41
  42 #include <linux/kthread.h>
  43 #include <libcfs/libcfs.h>
  44 #include <obd.h>
  45 #include <obd_class.h>
  46 #include <lustre_dlm.h>
  47 #include <lustre_net.h>
  48 #include <lustre_sec.h>
  49 #include "ldlm_internal.h"
  50
  51 /* @priority: If non-zero, move the selected connection to the list head.
  52  * @create: If zero, only search in existing connections.
  53  */
  54 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  55                            int priority, int create)
  56 {
  57         struct ptlrpc_connection *ptlrpc_conn;
  58         struct obd_import_conn *imp_conn = NULL, *item;
  59         int rc = 0;
  60         ENTRY;
  61
  62         if (!create && !priority) {
  63                 CDEBUG(D_HA, "Nothing to do\n");
  64                 RETURN(-EINVAL);
  65         }
  66
  67         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
  68         if (!ptlrpc_conn) {
  69                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  70                 RETURN (-ENOENT);
  71         }
  72
  73         if (create) {
  74                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  75                 if (!imp_conn) {
  76                         GOTO(out_put, rc = -ENOMEM);
  77                 }
  78         }
  79
  80         spin_lock(&imp->imp_lock);
  81         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  82                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  83                         if (priority) {
  84                                 list_del(&item->oic_item);
  85                                 list_add(&item->oic_item,
  86                                              &imp->imp_conn_list);
  87                                 item->oic_last_attempt = 0;
  88                         }
  89                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  90                                imp, imp->imp_obd->obd_name, uuid->uuid,
  91                                (priority ? ", moved to head" : ""));
  92                         spin_unlock(&imp->imp_lock);
  93                         GOTO(out_free, rc = 0);
  94                 }
  95         }
  96         /* No existing import connection found for \a uuid. */
  97         if (create) {
  98                 imp_conn->oic_conn = ptlrpc_conn;
  99                 imp_conn->oic_uuid = *uuid;
 100                 imp_conn->oic_last_attempt = 0;
 101                 if (priority)
 102                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 103                 else
 104                         list_add_tail(&imp_conn->oic_item,
 105                                           &imp->imp_conn_list);
 106                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 107                        imp, imp->imp_obd->obd_name, uuid->uuid,
 108                        (priority ? "head" : "tail"));
 109         } else {
 110                 spin_unlock(&imp->imp_lock);
 111                 GOTO(out_free, rc = -ENOENT);
 112         }
 113
 114         spin_unlock(&imp->imp_lock);
 115         RETURN(0);
 116 out_free:
 117         if (imp_conn)
 118                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 119 out_put:
 120         ptlrpc_connection_put(ptlrpc_conn);
 121         RETURN(rc);
 122 }
 123
 124 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 125 {
 126         return import_set_conn(imp, uuid, 1, 0);
 127 }
 128
 129 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 130                            int priority)
 131 {
 132         return import_set_conn(imp, uuid, priority, 1);
 133 }
 134 EXPORT_SYMBOL(client_import_add_conn);
 135
 136 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 137 {
 138         struct obd_import_conn *imp_conn;
 139         struct obd_export *dlmexp;
 140         int rc = -ENOENT;
 141         ENTRY;
 142
 143         spin_lock(&imp->imp_lock);
 144         if (list_empty(&imp->imp_conn_list)) {
 145                 LASSERT(!imp->imp_connection);
 146                 GOTO(out, rc);
 147         }
 148
 149         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 150                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 151                         continue;
 152                 LASSERT(imp_conn->oic_conn);
 153
 154                 if (imp_conn == imp->imp_conn_current) {
 155                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 156
 157                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 158                             imp->imp_state != LUSTRE_IMP_DISCON) {
 159                                 CERROR("can't remove current connection\n");
 160                                 GOTO(out, rc = -EBUSY);
 161                         }
 162
 163                         ptlrpc_connection_put(imp->imp_connection);
 164                         imp->imp_connection = NULL;
 165
 166                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 167                         if (dlmexp && dlmexp->exp_connection) {
 168                                 LASSERT(dlmexp->exp_connection ==
 169                                         imp_conn->oic_conn);
 170                                 ptlrpc_connection_put(dlmexp->exp_connection);
 171                                 dlmexp->exp_connection = NULL;
 172                         }
 173
 174                         if (dlmexp != NULL)
 175                                 class_export_put(dlmexp);
 176                 }
 177
 178                 list_del(&imp_conn->oic_item);
 179                 ptlrpc_connection_put(imp_conn->oic_conn);
 180                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 181                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 182                        imp, imp->imp_obd->obd_name, uuid->uuid);
 183                 rc = 0;
 184                 break;
 185         }
 186 out:
 187         spin_unlock(&imp->imp_lock);
 188         if (rc == -ENOENT)
 189                 CERROR("connection %s not found\n", uuid->uuid);
 190         RETURN(rc);
 191 }
 192 EXPORT_SYMBOL(client_import_del_conn);
 193
 194 /**
 195  * Find conn UUID by peer NID. \a peer is a server NID. This function is used
 196  * to find a conn uuid of \a imp which can reach \a peer.
 197  */
 198 int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
 199                             struct obd_uuid *uuid)
 200 {
 201         struct obd_import_conn *conn;
 202         int rc = -ENOENT;
 203         ENTRY;
 204
 205         spin_lock(&imp->imp_lock);
 206         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 207                 /* Check if conn UUID does have this peer NID. */
 208                 if (class_check_uuid(&conn->oic_uuid, peer)) {
 209                         *uuid = conn->oic_uuid;
 210                         rc = 0;
 211                         break;
 212                 }
 213         }
 214         spin_unlock(&imp->imp_lock);
 215         RETURN(rc);
 216 }
 217 EXPORT_SYMBOL(client_import_find_conn);
 218
 219 void client_destroy_import(struct obd_import *imp)
 220 {
 221         /* Drop security policy instance after all RPCs have finished/aborted
 222          * to let all busy contexts be released. */
 223         class_import_get(imp);
 224         class_destroy_import(imp);
 225         sptlrpc_import_sec_put(imp);
 226         class_import_put(imp);
 227 }
 228 EXPORT_SYMBOL(client_destroy_import);
 229
 230 /**
 231  * Check whether or not the OSC is on MDT.
 232  * In the config log,
 233  * osc on MDT
 234  *      setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
 235  * osc on client
 236  *      setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
 237  *
 238  **/
 239 static int osc_on_mdt(char *obdname)
 240 {
 241         char *ptr;
 242
 243         ptr = strrchr(obdname, '-');
 244         if (ptr == NULL)
 245                 return 0;
 246
 247         if (strncmp(ptr + 1, "MDT", 3) == 0)
 248                 return 1;
 249
 250         return 0;
 251 }
 252
 253 /* Configure an RPC client OBD device.
 254  *
 255  * lcfg parameters:
 256  * 1 - client UUID
 257  * 2 - server UUID
 258  * 3 - inactive-on-startup
 259  */
 260 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 261 {
 262         struct client_obd *cli = &obddev->u.cli;
 263         struct obd_import *imp;
 264         struct obd_uuid server_uuid;
 265         int rq_portal, rp_portal, connect_op;
 266         char *name = obddev->obd_type->typ_name;
 267         enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
 268         char *cli_name = lustre_cfg_buf(lcfg, 0);
 269         int rc;
 270         ENTRY;
 271
 272         /* In a more perfect world, we would hang a ptlrpc_client off of
 273          * obd_type and just use the values from there. */
 274         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 275                 rq_portal = OST_REQUEST_PORTAL;
 276                 rp_portal = OSC_REPLY_PORTAL;
 277                 connect_op = OST_CONNECT;
 278                 cli->cl_sp_me = LUSTRE_SP_CLI;
 279                 cli->cl_sp_to = LUSTRE_SP_OST;
 280                 ns_type = LDLM_NS_TYPE_OSC;
 281         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
 282                    !strcmp(name, LUSTRE_LWP_NAME)) {
 283                 rq_portal = MDS_REQUEST_PORTAL;
 284                 rp_portal = MDC_REPLY_PORTAL;
 285                 connect_op = MDS_CONNECT;
 286                 if (is_lwp_on_ost(cli_name))
 287                         cli->cl_sp_me = LUSTRE_SP_OST;
 288                 else if (is_lwp_on_mdt(cli_name))
 289                         cli->cl_sp_me = LUSTRE_SP_MDT;
 290                 else
 291                         cli->cl_sp_me = LUSTRE_SP_CLI;
 292                 cli->cl_sp_to = LUSTRE_SP_MDT;
 293                 ns_type = LDLM_NS_TYPE_MDC;
 294         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
 295                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
 296                         /* OSP_on_MDT for other MDTs */
 297                         connect_op = MDS_CONNECT;
 298                         cli->cl_sp_to = LUSTRE_SP_MDT;
 299                         ns_type = LDLM_NS_TYPE_MDC;
 300                         rq_portal = OUT_PORTAL;
 301                 } else {
 302                         /* OSP on MDT for OST */
 303                         connect_op = OST_CONNECT;
 304                         cli->cl_sp_to = LUSTRE_SP_OST;
 305                         ns_type = LDLM_NS_TYPE_OSC;
 306                         rq_portal = OST_REQUEST_PORTAL;
 307                 }
 308                 rp_portal = OSC_REPLY_PORTAL;
 309                 cli->cl_sp_me = LUSTRE_SP_MDT;
 310         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 311                 rq_portal = MGS_REQUEST_PORTAL;
 312                 rp_portal = MGC_REPLY_PORTAL;
 313                 connect_op = MGS_CONNECT;
 314                 cli->cl_sp_me = LUSTRE_SP_MGC;
 315                 cli->cl_sp_to = LUSTRE_SP_MGS;
 316                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 317                 ns_type = LDLM_NS_TYPE_MGC;
 318         } else {
 319                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 320                        name);
 321                 RETURN(-EINVAL);
 322         }
 323
 324         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 325                 CERROR("requires a TARGET UUID\n");
 326                 RETURN(-EINVAL);
 327         }
 328
 329         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 330                 CERROR("client UUID must be less than 38 characters\n");
 331                 RETURN(-EINVAL);
 332         }
 333
 334         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 335                 CERROR("setup requires a SERVER UUID\n");
 336                 RETURN(-EINVAL);
 337         }
 338
 339         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 340                 CERROR("target UUID must be less than 38 characters\n");
 341                 RETURN(-EINVAL);
 342         }
 343
 344         init_rwsem(&cli->cl_sem);
 345         mutex_init(&cli->cl_mgc_mutex);
 346         cli->cl_conn_count = 0;
 347         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 348                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 349                      sizeof(server_uuid)));
 350
 351         cli->cl_dirty_pages = 0;
 352         cli->cl_avail_grant = 0;
 353         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
 354         /* cl_dirty_max_pages may be changed at connect time in
 355          * ptlrpc_connect_interpret(). */
 356         client_adjust_max_dirty(cli);
 357         INIT_LIST_HEAD(&cli->cl_cache_waiters);
 358         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 359         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 360         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 361         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 362         spin_lock_init(&cli->cl_loi_list_lock);
 363         atomic_set(&cli->cl_pending_w_pages, 0);
 364         atomic_set(&cli->cl_pending_r_pages, 0);
 365         cli->cl_r_in_flight = 0;
 366         cli->cl_w_in_flight = 0;
 367
 368         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 369         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 370         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 371         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 372         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 373         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 374
 375         /* lru for osc. */
 376         INIT_LIST_HEAD(&cli->cl_lru_osc);
 377         atomic_set(&cli->cl_lru_shrinkers, 0);
 378         atomic_long_set(&cli->cl_lru_busy, 0);
 379         atomic_long_set(&cli->cl_lru_in_list, 0);
 380         INIT_LIST_HEAD(&cli->cl_lru_list);
 381         spin_lock_init(&cli->cl_lru_list_lock);
 382         atomic_long_set(&cli->cl_unstable_count, 0);
 383         INIT_LIST_HEAD(&cli->cl_shrink_list);
 384
 385         init_waitqueue_head(&cli->cl_destroy_waitq);
 386         atomic_set(&cli->cl_destroy_in_flight, 0);
 387 #ifdef ENABLE_CHECKSUM
 388         /* Turn on checksumming by default. */
 389         cli->cl_checksum = 1;
 390         /*
 391          * The supported checksum types will be worked out at connect time
 392          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 393          * through procfs.
 394          */
 395         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 396 #endif
 397         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 398
 399         /* Set it to possible maximum size. It may be reduced by ocd_brw_size
 400          * from OFD after connecting. */
 401         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 402
 403         /* set cl_chunkbits default value to PAGE_SHIFT,
 404          * it will be updated at OSC connection time. */
 405         cli->cl_chunkbits = PAGE_SHIFT;
 406
 407         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 408                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 409         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
 410                 cli->cl_max_rpcs_in_flight = 2;
 411         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
 412                 cli->cl_max_rpcs_in_flight = 3;
 413         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
 414                 cli->cl_max_rpcs_in_flight = 4;
 415         } else {
 416                 if (osc_on_mdt(obddev->obd_name))
 417                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
 418                 else
 419                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 420         }
 421
 422         spin_lock_init(&cli->cl_mod_rpcs_lock);
 423         spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
 424         cli->cl_max_mod_rpcs_in_flight = 0;
 425         cli->cl_mod_rpcs_in_flight = 0;
 426         cli->cl_close_rpcs_in_flight = 0;
 427         init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
 428         cli->cl_mod_tag_bitmap = NULL;
 429
 430         if (connect_op == MDS_CONNECT) {
 431                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
 432                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
 433                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 434                 if (cli->cl_mod_tag_bitmap == NULL)
 435                         GOTO(err, rc = -ENOMEM);
 436         }
 437
 438         rc = ldlm_get_ref();
 439         if (rc) {
 440                 CERROR("ldlm_get_ref failed: %d\n", rc);
 441                 GOTO(err, rc);
 442         }
 443
 444         ptlrpc_init_client(rq_portal, rp_portal, name,
 445                            &obddev->obd_ldlm_client);
 446
 447         imp = class_new_import(obddev);
 448         if (imp == NULL)
 449                 GOTO(err_ldlm, rc = -ENOENT);
 450         imp->imp_client = &obddev->obd_ldlm_client;
 451         imp->imp_connect_op = connect_op;
 452         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 453                LUSTRE_CFG_BUFLEN(lcfg, 1));
 454         class_import_put(imp);
 455
 456         rc = client_import_add_conn(imp, &server_uuid, 1);
 457         if (rc) {
 458                 CERROR("can't add initial connection\n");
 459                 GOTO(err_import, rc);
 460         }
 461
 462         cli->cl_import = imp;
 463         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
 464         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 465
 466         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 467                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 468                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 469                                name, obddev->obd_name,
 470                                cli->cl_target_uuid.uuid);
 471                         spin_lock(&imp->imp_lock);
 472                         imp->imp_deactive = 1;
 473                         spin_unlock(&imp->imp_lock);
 474                 }
 475         }
 476
 477         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 478                                                    LDLM_NAMESPACE_CLIENT,
 479                                                    LDLM_NAMESPACE_GREEDY,
 480                                                    ns_type);
 481         if (obddev->obd_namespace == NULL) {
 482                 CERROR("Unable to create client namespace - %s\n",
 483                        obddev->obd_name);
 484                 GOTO(err_import, rc = -ENOMEM);
 485         }
 486
 487         RETURN(rc);
 488
 489 err_import:
 490         class_destroy_import(imp);
 491 err_ldlm:
 492         ldlm_put_ref();
 493 err:
 494         if (cli->cl_mod_tag_bitmap != NULL)
 495                 OBD_FREE(cli->cl_mod_tag_bitmap,
 496                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 497         cli->cl_mod_tag_bitmap = NULL;
 498         RETURN(rc);
 499
 500 }
 501 EXPORT_SYMBOL(client_obd_setup);
 502
 503 int client_obd_cleanup(struct obd_device *obddev)
 504 {
 505         struct client_obd *cli = &obddev->u.cli;
 506         ENTRY;
 507
 508         ldlm_namespace_free_post(obddev->obd_namespace);
 509         obddev->obd_namespace = NULL;
 510
 511         obd_cleanup_client_import(obddev);
 512         LASSERT(obddev->u.cli.cl_import == NULL);
 513
 514         ldlm_put_ref();
 515
 516         if (cli->cl_mod_tag_bitmap != NULL)
 517                 OBD_FREE(cli->cl_mod_tag_bitmap,
 518                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 519         cli->cl_mod_tag_bitmap = NULL;
 520
 521         RETURN(0);
 522 }
 523 EXPORT_SYMBOL(client_obd_cleanup);
 524
 525 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 526 int client_connect_import(const struct lu_env *env,
 527                           struct obd_export **exp,
 528                           struct obd_device *obd, struct obd_uuid *cluuid,
 529                           struct obd_connect_data *data, void *localdata)
 530 {
 531         struct client_obd       *cli    = &obd->u.cli;
 532         struct obd_import       *imp    = cli->cl_import;
 533         struct obd_connect_data *ocd;
 534         struct lustre_handle    conn    = { 0 };
 535         int                     rc;
 536         bool                    is_mdc = false;
 537         ENTRY;
 538
 539         *exp = NULL;
 540         down_write(&cli->cl_sem);
 541         if (cli->cl_conn_count > 0)
 542                 GOTO(out_sem, rc = -EALREADY);
 543
 544         rc = class_connect(&conn, obd, cluuid);
 545         if (rc)
 546                 GOTO(out_sem, rc);
 547
 548         cli->cl_conn_count++;
 549         *exp = class_conn2export(&conn);
 550
 551         LASSERT(obd->obd_namespace);
 552
 553         imp->imp_dlm_handle = conn;
 554         rc = ptlrpc_init_import(imp);
 555         if (rc != 0)
 556                 GOTO(out_ldlm, rc);
 557
 558         ocd = &imp->imp_connect_data;
 559         if (data) {
 560                 *ocd = *data;
 561                 is_mdc = strncmp(imp->imp_obd->obd_type->typ_name,
 562                                  LUSTRE_MDC_NAME, 3) == 0;
 563                 if (is_mdc)
 564                         data->ocd_connect_flags |= OBD_CONNECT_MULTIMODRPCS;
 565                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 566                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
 567         }
 568
 569         rc = ptlrpc_connect_import(imp);
 570         if (rc != 0) {
 571                 if (data && is_mdc)
 572                         data->ocd_connect_flags &= ~OBD_CONNECT_MULTIMODRPCS;
 573                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 574                 GOTO(out_ldlm, rc);
 575         }
 576         LASSERT(*exp != NULL && (*exp)->exp_connection);
 577
 578         if (data) {
 579                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 580                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 581                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 582                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 583                 /* clear the flag as it was not set and is not known
 584                  * by upper layers */
 585                 if (is_mdc)
 586                         data->ocd_connect_flags &= ~OBD_CONNECT_MULTIMODRPCS;
 587         }
 588
 589         ptlrpc_pinger_add_import(imp);
 590
 591         EXIT;
 592
 593         if (rc) {
 594 out_ldlm:
 595                 cli->cl_conn_count--;
 596                 class_disconnect(*exp);
 597                 *exp = NULL;
 598         }
 599 out_sem:
 600         up_write(&cli->cl_sem);
 601
 602         return rc;
 603 }
 604 EXPORT_SYMBOL(client_connect_import);
 605
 606 int client_disconnect_export(struct obd_export *exp)
 607 {
 608         struct obd_device *obd = class_exp2obd(exp);
 609         struct client_obd *cli;
 610         struct obd_import *imp;
 611         int rc = 0, err;
 612         ENTRY;
 613
 614         if (!obd) {
 615                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 616                        exp, exp ? exp->exp_handle.h_cookie : -1);
 617                 RETURN(-EINVAL);
 618         }
 619
 620         cli = &obd->u.cli;
 621         imp = cli->cl_import;
 622
 623         down_write(&cli->cl_sem);
 624         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
 625                 cli->cl_conn_count);
 626
 627         if (cli->cl_conn_count == 0) {
 628                 CERROR("disconnecting disconnected device (%s)\n",
 629                        obd->obd_name);
 630                 GOTO(out_disconnect, rc = -EINVAL);
 631         }
 632
 633         cli->cl_conn_count--;
 634         if (cli->cl_conn_count != 0)
 635                 GOTO(out_disconnect, rc = 0);
 636
 637         /* Mark import deactivated now, so we don't try to reconnect if any
 638          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 639          * fully deactivate the import, or that would drop all requests. */
 640         spin_lock(&imp->imp_lock);
 641         imp->imp_deactive = 1;
 642         spin_unlock(&imp->imp_lock);
 643
 644         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 645          * delete it regardless.  (It's safe to delete an import that was
 646          * never added.) */
 647         (void)ptlrpc_pinger_del_import(imp);
 648
 649         if (obd->obd_namespace != NULL) {
 650                 /* obd_force == local only */
 651                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 652                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 653                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 654         }
 655
 656         /* There's no need to hold sem while disconnecting an import,
 657          * and it may actually cause deadlock in GSS. */
 658         up_write(&cli->cl_sem);
 659         rc = ptlrpc_disconnect_import(imp, 0);
 660         down_write(&cli->cl_sem);
 661
 662         ptlrpc_invalidate_import(imp);
 663
 664         EXIT;
 665
 666 out_disconnect:
 667         /* Use server style - class_disconnect should be always called for
 668          * o_disconnect. */
 669         err = class_disconnect(exp);
 670         if (!rc && err)
 671                 rc = err;
 672
 673         up_write(&cli->cl_sem);
 674
 675         RETURN(rc);
 676 }
 677 EXPORT_SYMBOL(client_disconnect_export);
 678
 679 #ifdef HAVE_SERVER_SUPPORT
 680 int server_disconnect_export(struct obd_export *exp)
 681 {
 682         int rc;
 683         ENTRY;
 684
 685         /* Disconnect early so that clients can't keep using export. */
 686         rc = class_disconnect(exp);
 687         /* Close import to avoid sending any requests. */
 688         if (exp->exp_imp_reverse)
 689                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 690
 691         ldlm_bl_thread_wakeup();
 692
 693         /* complete all outstanding replies */
 694         spin_lock(&exp->exp_lock);
 695         while (!list_empty(&exp->exp_outstanding_replies)) {
 696                 struct ptlrpc_reply_state *rs =
 697                         list_entry(exp->exp_outstanding_replies.next,
 698                                        struct ptlrpc_reply_state, rs_exp_list);
 699                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 700
 701                 spin_lock(&svcpt->scp_rep_lock);
 702
 703                 list_del_init(&rs->rs_exp_list);
 704                 spin_lock(&rs->rs_lock);
 705                 ptlrpc_schedule_difficult_reply(rs);
 706                 spin_unlock(&rs->rs_lock);
 707
 708                 spin_unlock(&svcpt->scp_rep_lock);
 709         }
 710         spin_unlock(&exp->exp_lock);
 711
 712         RETURN(rc);
 713 }
 714 EXPORT_SYMBOL(server_disconnect_export);
 715
 716 /* --------------------------------------------------------------------------
 717  * from old lib/target.c
 718  * -------------------------------------------------------------------------- */
 719
 720 static int target_handle_reconnect(struct lustre_handle *conn,
 721                                    struct obd_export *exp,
 722                                    struct obd_uuid *cluuid)
 723 {
 724         struct obd_device *target;
 725         struct lustre_handle *hdl;
 726         cfs_time_t now;
 727         cfs_time_t deadline;
 728         int timeout;
 729         int rc = 0;
 730         ENTRY;
 731
 732         hdl = &exp->exp_imp_reverse->imp_remote_handle;
 733         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
 734                 conn->cookie = exp->exp_handle.h_cookie;
 735                 CDEBUG(D_HA, "connect export for UUID '%s' at %p,"
 736                        " cookie %#llx\n", cluuid->uuid, exp, conn->cookie);
 737                 RETURN(0);
 738         }
 739
 740         target = exp->exp_obd;
 741
 742         /* Might be a re-connect after a partition. */
 743         if (memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 744                 LCONSOLE_WARN("%s: already connected client %s (at %s) "
 745                               "with handle %#llx. Rejecting client "
 746                               "with the same UUID trying to reconnect "
 747                               "with handle %#llx\n", target->obd_name,
 748                               obd_uuid2str(&exp->exp_client_uuid),
 749                               obd_export_nid2str(exp),
 750                               hdl->cookie, conn->cookie);
 751                 memset(conn, 0, sizeof *conn);
 752                 /* target_handle_connect() treats EALREADY and
 753                  * -EALREADY differently.  -EALREADY is an error
 754                  * (same UUID, different handle). */
 755                 RETURN(-EALREADY);
 756         }
 757
 758         if (!target->obd_recovering) {
 759                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
 760                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
 761                         obd_export_nid2str(exp));
 762                 GOTO(out_already, rc);
 763         }
 764
 765         now = cfs_time_current();
 766         deadline = cfs_timer_deadline(&target->obd_recovery_timer);
 767         if (cfs_time_before(now, deadline)) {
 768                 struct target_distribute_txn_data *tdtd =
 769                                         class_exp2tgt(exp)->lut_tdtd;
 770                 int size = 0;
 771                 int count = 0;
 772                 char *buf = NULL;
 773
 774                 timeout = cfs_duration_sec(cfs_time_sub(deadline, now));
 775                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
 776                         buf = tdtd->tdtd_show_update_logs_retrievers(
 777                                 tdtd->tdtd_show_retrievers_cbdata,
 778                                 &size, &count);
 779
 780                 if (count > 0)
 781                         LCONSOLE_WARN("%s: Recovery already passed deadline "
 782                                       "%d:%.02d. It is due to DNE recovery "
 783                                       "failed/stuck on the %d MDT(s):%s. "
 784                                       "Please wait until all MDTs recovered "
 785                                       "or abort the recovery by force.\n",
 786                                       target->obd_name, timeout / 60,
 787                                       timeout % 60, count,
 788                                       buf ? buf : "unknown (not enough RAM)");
 789                 else
 790                         LCONSOLE_WARN("%s: Recovery already passed deadline "
 791                                       "%d:%.02d. If you do not want to wait "
 792                                       "more, please abort the recovery by "
 793                                       "force.\n", target->obd_name,
 794                                       timeout / 60, timeout % 60);
 795
 796                 if (buf != NULL)
 797                         OBD_FREE(buf, size);
 798         } else {
 799                 timeout = cfs_duration_sec(cfs_time_sub(now, deadline));
 800                 LCONSOLE_WARN("%s: Recovery already passed deadline"
 801                         " %d:%.02d, It is most likely due to DNE"
 802                         " recovery is failed or stuck, please wait a"
 803                         " few more minutes or abort the recovery.\n",
 804                         target->obd_name, timeout / 60, timeout % 60);
 805         }
 806
 807 out_already:
 808         conn->cookie = exp->exp_handle.h_cookie;
 809         /* target_handle_connect() treats EALREADY and
 810          * -EALREADY differently.  EALREADY means we are
 811          * doing a valid reconnect from the same client. */
 812         RETURN(EALREADY);
 813 }
 814
 815 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
 816                           int error)
 817 {
 818         struct obd_export *exp = cb_data;
 819
 820         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 821                obd->obd_name, exp->exp_client_uuid.uuid);
 822
 823         spin_lock(&exp->exp_lock);
 824         exp->exp_need_sync = 0;
 825         spin_unlock(&exp->exp_lock);
 826         class_export_cb_put(exp);
 827 }
 828
 829 static void
 830 check_and_start_recovery_timer(struct obd_device *obd,
 831                                struct ptlrpc_request *req, int new_client);
 832
 833 /**
 834  * update flags for import during reconnect process
 835  */
 836 static int rev_import_flags_update(struct obd_import *revimp,
 837                                    struct ptlrpc_request *req)
 838 {
 839         int rc;
 840         struct obd_connect_data *data;
 841
 842         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 843
 844         if (data->ocd_connect_flags & OBD_CONNECT_AT)
 845                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 846         else
 847                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 848
 849         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
 850
 851         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
 852         if (rc) {
 853                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
 854                         revimp->imp_client->cli_name,
 855                         libcfs_id2str(req->rq_peer), rc);
 856                 return rc;
 857         }
 858
 859         return 0;
 860 }
 861
 862 /**
 863  * Allocate a new reverse import for an export.
 864  *
 865  * \retval -errno in case error hit
 866  * \retval 0 if reverse import correctly init
 867  **/
 868 int rev_import_init(struct obd_export *export)
 869 {
 870         struct obd_device *obd = export->exp_obd;
 871         struct obd_import *revimp;
 872
 873         LASSERT(export->exp_imp_reverse == NULL);
 874
 875         revimp = class_new_import(obd);
 876         if (revimp == NULL)
 877                 return -ENOMEM;
 878
 879         revimp->imp_remote_handle.cookie = 0ULL;
 880         revimp->imp_client = &obd->obd_ldlm_client;
 881         revimp->imp_dlm_fake = 1;
 882
 883         /* it is safe to connect import in new state as no sends possible */
 884         spin_lock(&export->exp_lock);
 885         export->exp_imp_reverse = revimp;
 886         spin_unlock(&export->exp_lock);
 887         class_import_put(revimp);
 888
 889         return 0;
 890 }
 891 EXPORT_SYMBOL(rev_import_init);
 892
 893 /**
 894  * Handle reconnect for an export.
 895  *
 896  * \param exp export to handle reconnect process
 897  * \param req client reconnect request
 898  *
 899  * \retval -rc in case securitfy flavor can't be changed
 900  * \retval 0 in case none problems
 901  */
 902 static int rev_import_reconnect(struct obd_export *exp,
 903                                 struct ptlrpc_request *req)
 904 {
 905         struct obd_import *revimp = exp->exp_imp_reverse;
 906         struct lustre_handle *lh;
 907         int rc;
 908
 909         /* avoid sending a request until import flags are changed */
 910         ptlrpc_import_enter_resend(revimp);
 911
 912         if (revimp->imp_connection != NULL)
 913                 ptlrpc_connection_put(revimp->imp_connection);
 914
 915         /*
 916          * client from recovery don't have a handle so we need to take from
 917          * request. it may produce situation when wrong client connected
 918          * to recovery as we trust a client uuid
 919          */
 920         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 921         revimp->imp_remote_handle = *lh;
 922
 923         /* unknown versions will be caught in
 924          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
 925         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
 926
 927         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
 928
 929         rc = rev_import_flags_update(revimp, req);
 930         if (rc != 0) {
 931                 /* it is safe to still be in RECOVERY phase as we are not able
 932                  * to setup correct security flavor so requests are not able to
 933                  * be delivered correctly */
 934                 return rc;
 935         }
 936
 937         /* resend all rpc's via new connection */
 938         return ptlrpc_import_recovery_state_machine(revimp);
 939 }
 940
 941 int target_handle_connect(struct ptlrpc_request *req)
 942 {
 943         struct obd_device *target = NULL;
 944         struct obd_export *export = NULL;
 945         /* connect handle - filled from target_handle_reconnect in
 946          * reconnect case */
 947         struct lustre_handle conn;
 948         struct lustre_handle *tmp;
 949         struct obd_uuid tgtuuid;
 950         struct obd_uuid cluuid;
 951         char *str;
 952         int rc = 0;
 953         char *target_start;
 954         int target_len;
 955         bool     mds_conn = false, lw_client = false, initial_conn = false;
 956         bool     mds_mds_conn = false;
 957         bool     new_mds_mds_conn = false;
 958         bool     target_referenced = false;
 959         struct obd_connect_data *data, *tmpdata;
 960         int size, tmpsize;
 961         lnet_nid_t *client_nid = NULL;
 962         ENTRY;
 963
 964         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 965
 966         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 967         if (str == NULL) {
 968                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 969                 GOTO(out, rc = -EINVAL);
 970         }
 971
 972         obd_str2uuid(&tgtuuid, str);
 973         target = class_uuid2obd(&tgtuuid);
 974         if (!target)
 975                 target = class_name2obd(str);
 976
 977         if (!target) {
 978                 deuuidify(str, NULL, &target_start, &target_len);
 979                 LCONSOLE_ERROR_MSG(0x137, "%s: not available for connect "
 980                                    "from %s (no target). If you are running "
 981                                    "an HA pair check that the target is "
 982                                    "mounted on the other server.\n", str,
 983                                    libcfs_nid2str(req->rq_peer.nid));
 984                 GOTO(out, rc = -ENODEV);
 985         }
 986
 987         spin_lock(&target->obd_dev_lock);
 988         if (target->obd_stopping || !target->obd_set_up) {
 989                 spin_unlock(&target->obd_dev_lock);
 990
 991                 deuuidify(str, NULL, &target_start, &target_len);
 992                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
 993                               target_len, target_start,
 994                               libcfs_nid2str(req->rq_peer.nid),
 995                               (target->obd_stopping ?
 996                                "stopping" : "not set up"));
 997                 GOTO(out, rc = -ENODEV);
 998         }
 999
1000         if (target->obd_no_conn) {
1001                 spin_unlock(&target->obd_dev_lock);
1002
1003                 CDEBUG(D_INFO, "%s: Temporarily refusing client connection "
1004                                "from %s\n", target->obd_name,
1005                                libcfs_nid2str(req->rq_peer.nid));
1006                 GOTO(out, rc = -EAGAIN);
1007         }
1008
1009         /* Make sure the target isn't cleaned up while we're here. Yes,
1010          * there's still a race between the above check and our incref here.
1011          * Really, class_uuid2obd should take the ref. */
1012         class_incref(target, __func__, current);
1013         target_referenced = true;
1014
1015         target->obd_conn_inprogress++;
1016         spin_unlock(&target->obd_dev_lock);
1017
1018         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1019         if (str == NULL) {
1020                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1021                 GOTO(out, rc = -EINVAL);
1022         }
1023
1024         obd_str2uuid(&cluuid, str);
1025
1026         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1027         if (tmp == NULL)
1028                 GOTO(out, rc = -EPROTO);
1029
1030         conn = *tmp;
1031
1032         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1033                                     RCL_CLIENT);
1034         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1035         if (!data)
1036                 GOTO(out, rc = -EPROTO);
1037
1038         rc = req_capsule_server_pack(&req->rq_pill);
1039         if (rc)
1040                 GOTO(out, rc);
1041
1042 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1043         /* Don't allow clients to connect that are using old 1.8 format
1044          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1045          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1046          * FULL20 flag should be set on all connections since 2.0, but no
1047          * longer affects behaviour.
1048          *
1049          * Later this check will be disabled and the flag can be retired
1050          * completely once interop with 3.0 is no longer needed.
1051          */
1052         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1053                 GOTO(out, rc = -EPROTO);
1054 #endif
1055
1056         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1057                 if (data->ocd_version < LUSTRE_VERSION_CODE -
1058                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
1059                     data->ocd_version > LUSTRE_VERSION_CODE +
1060                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
1061                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
1062                                   "libclient connection attempt",
1063                                   data->ocd_version < LUSTRE_VERSION_CODE ?
1064                                   "old" : "new",
1065                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
1066                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
1067                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
1068                                   OBD_OCD_VERSION_FIX(data->ocd_version));
1069                         data = req_capsule_server_sized_get(&req->rq_pill,
1070                                                             &RMF_CONNECT_DATA,
1071                                     offsetof(typeof(*data), ocd_version) +
1072                                              sizeof(data->ocd_version));
1073                         if (data) {
1074                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
1075                                 data->ocd_version = LUSTRE_VERSION_CODE;
1076                         }
1077                         GOTO(out, rc = -EPROTO);
1078                 }
1079         }
1080
1081         /* Note: lw_client is needed in MDS-MDS failover during update log
1082          * processing, so we needs to allow lw_client to be connected at
1083          * anytime, instead of only the initial connection */
1084         lw_client = (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0;
1085
1086         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1087                 initial_conn = true;
1088                 mds_conn = (data->ocd_connect_flags & OBD_CONNECT_MDS) != 0;
1089                 mds_mds_conn = (data->ocd_connect_flags &
1090                                 OBD_CONNECT_MDS_MDS) != 0;
1091
1092                 /* OBD_CONNECT_MNE_SWAB is defined as OBD_CONNECT_MDS_MDS
1093                  * for Imperative Recovery connection from MGC to MGS.
1094                  *
1095                  * Via check OBD_CONNECT_FID, we can distinguish whether
1096                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1097                  * MGC or MDT. */
1098                 if (!lw_client &&
1099                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1100                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1101                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1102                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1103                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1104                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1105
1106                         /* We do not support the MDT-MDT interoperations with
1107                          * different version MDT because of protocol changes. */
1108                         if (unlikely(major != LUSTRE_MAJOR ||
1109                                      minor != LUSTRE_MINOR ||
1110                                      abs(patch - LUSTRE_PATCH) > 3)) {
1111                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the "
1112                                         "connection from different version MDT "
1113                                         "(%d.%d.%d.%d) %s %s\n",
1114                                         target->obd_name, LUSTRE_MAJOR,
1115                                         LUSTRE_MINOR, LUSTRE_PATCH, LUSTRE_FIX,
1116                                         major, minor, patch,
1117                                         OBD_OCD_VERSION_FIX(data->ocd_version),
1118                                         libcfs_nid2str(req->rq_peer.nid), str);
1119
1120                                 GOTO(out, rc = -EPROTO);
1121                         }
1122                 }
1123         }
1124
1125         /* lctl gets a backstage, all-access pass. */
1126         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1127                 goto dont_check_exports;
1128
1129         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
1130         if (!export)
1131                 goto no_export;
1132
1133         /* We've found an export in the hash. */
1134
1135         spin_lock(&export->exp_lock);
1136
1137         if (export->exp_connecting) { /* bug 9635, et. al. */
1138                 spin_unlock(&export->exp_lock);
1139                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1140                               export->exp_obd->obd_name, export,
1141                               libcfs_nid2str(req->rq_peer.nid));
1142                 class_export_put(export);
1143                 export = NULL;
1144                 rc = -EALREADY;
1145         } else if ((mds_conn || (lw_client && initial_conn) ||
1146                    data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1147                    export->exp_connection != NULL) {
1148                 spin_unlock(&export->exp_lock);
1149                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1150                         /* MDS or LWP reconnected after failover. */
1151                         LCONSOLE_WARN("%s: Received %s connection from "
1152                             "%s, removing former export from %s\n",
1153                             target->obd_name, mds_conn ? "MDS" : "LWP",
1154                             libcfs_nid2str(req->rq_peer.nid),
1155                             libcfs_nid2str(export->exp_connection->c_peer.nid));
1156                 } else {
1157                         /* New MDS connection from the same NID. */
1158                         LCONSOLE_WARN("%s: Received new %s connection from "
1159                                 "%s, removing former export from same NID\n",
1160                                 target->obd_name, mds_conn ? "MDS" : "LWP",
1161                                 libcfs_nid2str(req->rq_peer.nid));
1162                 }
1163
1164                 if (req->rq_peer.nid == export->exp_connection->c_peer.nid &&
1165                     data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
1166                         /* Because exports between MDTs will always be
1167                          * kept, let's do not fail such export if they
1168                          * come from the same NID, otherwise it might
1169                          * cause eviction between MDTs, which might
1170                          * cause namespace inconsistency */
1171                         spin_lock(&export->exp_lock);
1172                         export->exp_connecting = 1;
1173                         spin_unlock(&export->exp_lock);
1174                         conn.cookie = export->exp_handle.h_cookie;
1175                         rc = EALREADY;
1176                 } else {
1177                         class_fail_export(export);
1178                         class_export_put(export);
1179                         export = NULL;
1180                         rc = 0;
1181                 }
1182         } else if (export->exp_connection != NULL && initial_conn &&
1183                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1184                 spin_unlock(&export->exp_lock);
1185                 /* In MDS failover we have static UUID but NID can change. */
1186                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when "
1187                               "existing nid %s is already connected\n",
1188                               target->obd_name, cluuid.uuid,
1189                               libcfs_nid2str(req->rq_peer.nid),
1190                               libcfs_nid2str(
1191                                       export->exp_connection->c_peer.nid));
1192                 rc = -EALREADY;
1193                 class_export_put(export);
1194                 export = NULL;
1195         } else {
1196                 export->exp_connecting = 1;
1197                 spin_unlock(&export->exp_lock);
1198                 LASSERT(export->exp_obd == target);
1199
1200                 rc = target_handle_reconnect(&conn, export, &cluuid);
1201         }
1202
1203         /* If we found an export, we already unlocked. */
1204         if (!export) {
1205 no_export:
1206                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1207         } else if (req->rq_export == NULL &&
1208                    atomic_read(&export->exp_rpc_count) > 0) {
1209                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, "
1210                               "still busy with %d references\n",
1211                               target->obd_name, cluuid.uuid,
1212                               libcfs_nid2str(req->rq_peer.nid),
1213                               atomic_read(&export->exp_refcount));
1214                 GOTO(out, rc = -EBUSY);
1215         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
1216                 if (!strstr(cluuid.uuid, "mdt"))
1217                         LCONSOLE_WARN("%s: Rejecting reconnect from the "
1218                                       "known client %s (at %s) because it "
1219                                       "is indicating it is a new client",
1220                                       target->obd_name, cluuid.uuid,
1221                                       libcfs_nid2str(req->rq_peer.nid));
1222                 GOTO(out, rc = -EALREADY);
1223         } else {
1224                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1225         }
1226
1227         if (rc < 0) {
1228                 GOTO(out, rc);
1229         }
1230
1231         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %ld last %ld\n",
1232                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1233               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1234               export, (long)cfs_time_current_sec(),
1235               export ? (long)export->exp_last_request_time : 0);
1236
1237         /* If this is the first time a client connects, reset the recovery
1238          * timer. Discard lightweight connections which might be local. */
1239         if (!lw_client && rc == 0 && target->obd_recovering)
1240                 check_and_start_recovery_timer(target, req, export == NULL);
1241
1242         /* We want to handle EALREADY but *not* -EALREADY from
1243          * target_handle_reconnect(), return reconnection state in a flag. */
1244         if (rc == EALREADY) {
1245                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1246                 rc = 0;
1247         } else {
1248                 LASSERT(rc == 0);
1249         }
1250
1251         /* Tell the client if we support replayable requests. */
1252         if (target->obd_replayable)
1253                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1254         client_nid = &req->rq_peer.nid;
1255
1256         if (export == NULL) {
1257                 /* allow lightweight connections during recovery */
1258                 /* allow "new" MDT to be connected during recovery, since we
1259                  * need retrieve recovery update records from it */
1260                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1261                         cfs_time_t t;
1262                         int     c; /* connected */
1263                         int     i; /* in progress */
1264                         int     k; /* known */
1265                         int     s; /* stale/evicted */
1266
1267                         c = atomic_read(&target->obd_connected_clients);
1268                         i = atomic_read(&target->obd_lock_replay_clients);
1269                         k = target->obd_max_recoverable_clients;
1270                         s = target->obd_stale_clients;
1271                         t = cfs_timer_deadline(&target->obd_recovery_timer);
1272                         t = cfs_time_sub(t, cfs_time_current());
1273                         t = cfs_duration_sec(t);
1274                         LCONSOLE_WARN("%s: Denying connection for new client %s"
1275                                       "(at %s), waiting for %d known clients "
1276                                       "(%d recovered, %d in progress, and %d "
1277                                       "evicted) to recover in %d:%.02d\n",
1278                                       target->obd_name, cluuid.uuid,
1279                                       libcfs_nid2str(req->rq_peer.nid), k,
1280                                       c - i, i, s, (int)t / 60,
1281                                       (int)t % 60);
1282                         rc = -EBUSY;
1283                 } else {
1284 dont_check_exports:
1285                         rc = obd_connect(req->rq_svc_thread->t_env,
1286                                          &export, target, &cluuid, data,
1287                                          client_nid);
1288                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1289                                 lustre_msg_add_op_flags(req->rq_repmsg,
1290                                                         MSG_CONNECT_RECOVERING);
1291                         if (rc == 0) {
1292                                 conn.cookie = export->exp_handle.h_cookie;
1293                                 rc = rev_import_init(export);
1294                         }
1295
1296                         if (mds_mds_conn)
1297                                 new_mds_mds_conn = true;
1298                 }
1299         } else {
1300                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1301                                    export, target, &cluuid, data, client_nid);
1302         }
1303         if (rc)
1304                 GOTO(out, rc);
1305
1306         LASSERT(target->u.obt.obt_magic == OBT_MAGIC);
1307         data->ocd_instance = target->u.obt.obt_instance;
1308
1309         /* Return only the parts of obd_connect_data that we understand, so the
1310          * client knows that we don't understand the rest. */
1311         if (data) {
1312                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1313                                                RCL_SERVER);
1314                 tmpdata = req_capsule_server_get(&req->rq_pill,
1315                                                  &RMF_CONNECT_DATA);
1316                 /* Don't use struct assignment here, because the client reply
1317                  * buffer may be smaller/larger than the local struct
1318                  * obd_connect_data. */
1319                 memcpy(tmpdata, data, min(tmpsize, size));
1320         }
1321
1322         /* If the client and the server are the same node, we will already
1323          * have an export that really points to the client's DLM export,
1324          * because we have a shared handles table.
1325          *
1326          * XXX this will go away when shaver stops sending the "connect" handle
1327          * in the real "remote handle" field of the request --phik 24 Apr 2003
1328          */
1329         ptlrpc_request_change_export(req, export);
1330
1331         spin_lock(&export->exp_lock);
1332         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1333                 spin_unlock(&export->exp_lock);
1334                 CDEBUG(D_RPCTRACE, "%s: %s already connected at greater "
1335                        "or equal conn_cnt: %d >= %d\n",
1336                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1337                        export->exp_conn_cnt,
1338                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1339
1340                 GOTO(out, rc = -EALREADY);
1341         }
1342         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1343         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1344
1345         /* Don't evict liblustre clients for not pinging. */
1346         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1347                 export->exp_libclient = 1;
1348                 spin_unlock(&export->exp_lock);
1349
1350                 spin_lock(&target->obd_dev_lock);
1351                 list_del_init(&export->exp_obd_chain_timed);
1352                 spin_unlock(&target->obd_dev_lock);
1353         } else {
1354                 spin_unlock(&export->exp_lock);
1355         }
1356
1357         if (export->exp_connection != NULL) {
1358                 /* Check to see if connection came from another NID. */
1359                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
1360                     !hlist_unhashed(&export->exp_nid_hash))
1361                         cfs_hash_del(export->exp_obd->obd_nid_hash,
1362                                      &export->exp_connection->c_peer.nid,
1363                                      &export->exp_nid_hash);
1364
1365                 ptlrpc_connection_put(export->exp_connection);
1366         }
1367
1368         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
1369                                                        req->rq_self,
1370                                                        &cluuid);
1371         if (hlist_unhashed(&export->exp_nid_hash))
1372                 cfs_hash_add(export->exp_obd->obd_nid_hash,
1373                              &export->exp_connection->c_peer.nid,
1374                              &export->exp_nid_hash);
1375
1376         lustre_msg_set_handle(req->rq_repmsg, &conn);
1377
1378         rc = rev_import_reconnect(export, req);
1379         if (rc != 0)
1380                 GOTO(out, rc);
1381
1382         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1383                 int has_transno;
1384                 __u64 transno = data->ocd_transno;
1385
1386                 spin_lock(&export->exp_lock);
1387                 /* possible race with class_disconnect_stale_exports,
1388                  * export may be already in the eviction process */
1389                 if (export->exp_failed) {
1390                         spin_unlock(&export->exp_lock);
1391                         GOTO(out, rc = -ENODEV);
1392                 }
1393                 export->exp_in_recovery = 1;
1394                 export->exp_req_replay_needed = 1;
1395                 export->exp_lock_replay_needed = 1;
1396                 spin_unlock(&export->exp_lock);
1397
1398                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1399                                  MSG_CONNECT_TRANSNO);
1400                 if (has_transno && transno == 0)
1401                         CWARN("Connect with zero transno!\n");
1402
1403                 if (has_transno && transno > 0 &&
1404                     transno < target->obd_next_recovery_transno &&
1405                     transno > target->obd_last_committed) {
1406                         /* Another way is to use cmpxchg() to be lock-free. */
1407                         spin_lock(&target->obd_recovery_task_lock);
1408                         if (transno < target->obd_next_recovery_transno)
1409                                 target->obd_next_recovery_transno = transno;
1410                         spin_unlock(&target->obd_recovery_task_lock);
1411                 }
1412
1413                 atomic_inc(&target->obd_req_replay_clients);
1414                 atomic_inc(&target->obd_lock_replay_clients);
1415                 /* Note: MDS-MDS connection is allowed to be connected during
1416                  * recovery, no matter if the exports needs to be recoveried.
1417                  * Because we need retrieve updates logs from all other MDTs.
1418                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1419                  * also needs to be increased to match other recovery checking
1420                  * condition. */
1421                 if (new_mds_mds_conn)
1422                         target->obd_max_recoverable_clients++;
1423                 if (atomic_inc_return(&target->obd_connected_clients) ==
1424                     target->obd_max_recoverable_clients)
1425                         wake_up(&target->obd_next_transno_waitq);
1426         }
1427
1428         /* Tell the client we're in recovery, when client is involved in it. */
1429         if (target->obd_recovering && !lw_client)
1430                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1431
1432 out:
1433         if (export) {
1434                 spin_lock(&export->exp_lock);
1435                 export->exp_connecting = 0;
1436                 spin_unlock(&export->exp_lock);
1437
1438                 class_export_put(export);
1439         }
1440         if (target_referenced == true && target != NULL) {
1441                 spin_lock(&target->obd_dev_lock);
1442                 target->obd_conn_inprogress--;
1443                 spin_unlock(&target->obd_dev_lock);
1444
1445                 class_decref(target, __func__, current);
1446         }
1447         req->rq_status = rc;
1448         RETURN(rc);
1449 }
1450
1451 int target_handle_disconnect(struct ptlrpc_request *req)
1452 {
1453         int rc;
1454         ENTRY;
1455
1456         rc = req_capsule_server_pack(&req->rq_pill);
1457         if (rc)
1458                 RETURN(rc);
1459
1460         /* Keep the rq_export around so we can send the reply. */
1461         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1462
1463         RETURN(0);
1464 }
1465
1466 void target_destroy_export(struct obd_export *exp)
1467 {
1468         struct obd_import       *imp = NULL;
1469         /* exports created from last_rcvd data, and "fake"
1470            exports created by lctl don't have an import */
1471         spin_lock(&exp->exp_lock);
1472         if (exp->exp_imp_reverse != NULL) {
1473                 imp = exp->exp_imp_reverse;
1474                 exp->exp_imp_reverse = NULL;
1475         }
1476         spin_unlock(&exp->exp_lock);
1477         if (imp != NULL)
1478                 client_destroy_import(imp);
1479
1480         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1481         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1482         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1483         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1484 }
1485 EXPORT_SYMBOL(target_destroy_export);
1486
1487 /*
1488  * Recovery functions
1489  */
1490 static void target_request_copy_get(struct ptlrpc_request *req)
1491 {
1492         class_export_rpc_inc(req->rq_export);
1493         LASSERT(list_empty(&req->rq_list));
1494         INIT_LIST_HEAD(&req->rq_replay_list);
1495
1496         /* Increase refcount to keep request in queue. */
1497         atomic_inc(&req->rq_refcount);
1498         /* Let export know it has replays to be handled. */
1499         atomic_inc(&req->rq_export->exp_replay_count);
1500 }
1501
1502 static void target_request_copy_put(struct ptlrpc_request *req)
1503 {
1504         LASSERT(list_empty(&req->rq_replay_list));
1505         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1506
1507         atomic_dec(&req->rq_export->exp_replay_count);
1508         class_export_rpc_dec(req->rq_export);
1509         ptlrpc_server_drop_request(req);
1510 }
1511
1512 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1513 {
1514         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1515         struct obd_export     *exp = req->rq_export;
1516         struct ptlrpc_request *reqiter;
1517         struct ptlrpc_request *dup_req = NULL;
1518         int                    dup = 0;
1519
1520         LASSERT(exp);
1521
1522         spin_lock(&exp->exp_lock);
1523         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1524                                 rq_replay_list) {
1525                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1526                         dup_req = reqiter;
1527                         dup = 1;
1528                         break;
1529                 }
1530         }
1531
1532         if (dup) {
1533                 /* We expect it with RESENT and REPLAY flags. */
1534                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1535                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1536                         CERROR("invalid flags %x of resent replay\n",
1537                                lustre_msg_get_flags(req->rq_reqmsg));
1538
1539                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1540                         __u32 new_conn;
1541
1542                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1543                         if (new_conn >
1544                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1545                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1546                                                         new_conn);
1547                 }
1548         } else {
1549                 list_add_tail(&req->rq_replay_list,
1550                                   &exp->exp_req_replay_queue);
1551         }
1552
1553         spin_unlock(&exp->exp_lock);
1554         return dup;
1555 }
1556
1557 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1558 {
1559         LASSERT(!list_empty(&req->rq_replay_list));
1560         LASSERT(req->rq_export);
1561
1562         spin_lock(&req->rq_export->exp_lock);
1563         list_del_init(&req->rq_replay_list);
1564         spin_unlock(&req->rq_export->exp_lock);
1565 }
1566
1567 static void target_finish_recovery(struct lu_target *lut)
1568 {
1569         struct obd_device *obd = lut->lut_obd;
1570         ENTRY;
1571
1572         /* Only log a recovery message when recovery has occurred. */
1573         if (obd->obd_recovery_start) {
1574                 time_t elapsed_time = max_t(time_t, 1, cfs_time_current_sec() -
1575                                         obd->obd_recovery_start);
1576                 LCONSOLE_INFO("%s: Recovery over after %d:%.02d, of %d clients "
1577                         "%d recovered and %d %s evicted.\n", obd->obd_name,
1578                         (int)elapsed_time / 60, (int)elapsed_time % 60,
1579                         obd->obd_max_recoverable_clients,
1580                         atomic_read(&obd->obd_connected_clients),
1581                         obd->obd_stale_clients,
1582                         obd->obd_stale_clients == 1 ? "was" : "were");
1583         }
1584
1585         ldlm_reprocess_all_ns(obd->obd_namespace);
1586         spin_lock(&obd->obd_recovery_task_lock);
1587         if (!list_empty(&obd->obd_req_replay_queue) ||
1588             !list_empty(&obd->obd_lock_replay_queue) ||
1589             !list_empty(&obd->obd_final_req_queue)) {
1590                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1591                        obd->obd_name,
1592                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1593                        list_empty(&obd->obd_lock_replay_queue) ? \
1594                                "" : "lock ",
1595                        list_empty(&obd->obd_final_req_queue) ? \
1596                                "" : "final ");
1597                 spin_unlock(&obd->obd_recovery_task_lock);
1598                 LBUG();
1599         }
1600         spin_unlock(&obd->obd_recovery_task_lock);
1601
1602         obd->obd_recovery_end = cfs_time_current_sec();
1603
1604         /* When recovery finished, cleanup orphans on MDS and OST. */
1605         if (OBT(obd) && OBP(obd, postrecov)) {
1606                 int rc = OBP(obd, postrecov)(obd);
1607                 if (rc < 0)
1608                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1609                                       obd->obd_name, rc);
1610         }
1611         EXIT;
1612 }
1613
1614 static void abort_req_replay_queue(struct obd_device *obd)
1615 {
1616         struct ptlrpc_request *req, *n;
1617         struct list_head abort_list;
1618
1619         INIT_LIST_HEAD(&abort_list);
1620         spin_lock(&obd->obd_recovery_task_lock);
1621         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1622         spin_unlock(&obd->obd_recovery_task_lock);
1623         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1624                 DEBUG_REQ(D_WARNING, req, "aborted:");
1625                 req->rq_status = -ENOTCONN;
1626                 if (ptlrpc_error(req)) {
1627                         DEBUG_REQ(D_ERROR, req,
1628                                   "failed abort_req_reply; skipping");
1629                 }
1630                 target_exp_dequeue_req_replay(req);
1631                 target_request_copy_put(req);
1632         }
1633 }
1634
1635 static void abort_lock_replay_queue(struct obd_device *obd)
1636 {
1637         struct ptlrpc_request *req, *n;
1638         struct list_head abort_list;
1639
1640         INIT_LIST_HEAD(&abort_list);
1641         spin_lock(&obd->obd_recovery_task_lock);
1642         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1643         spin_unlock(&obd->obd_recovery_task_lock);
1644         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1645                 DEBUG_REQ(D_ERROR, req, "aborted:");
1646                 req->rq_status = -ENOTCONN;
1647                 if (ptlrpc_error(req)) {
1648                         DEBUG_REQ(D_ERROR, req,
1649                                   "failed abort_lock_reply; skipping");
1650                 }
1651                 target_request_copy_put(req);
1652         }
1653 }
1654
1655 /* Called from a cleanup function if the device is being cleaned up
1656    forcefully.  The exports should all have been disconnected already,
1657    the only thing left to do is
1658      - clear the recovery flags
1659      - cancel the timer
1660      - free queued requests and replies, but don't send replies
1661    Because the obd_stopping flag is set, no new requests should be received.
1662
1663 */
1664 void target_cleanup_recovery(struct obd_device *obd)
1665 {
1666         struct ptlrpc_request *req, *n;
1667         struct list_head clean_list;
1668
1669         INIT_LIST_HEAD(&clean_list);
1670         spin_lock(&obd->obd_dev_lock);
1671         if (!obd->obd_recovering) {
1672                 spin_unlock(&obd->obd_dev_lock);
1673                 EXIT;
1674                 return;
1675         }
1676         obd->obd_recovering = obd->obd_abort_recovery = 0;
1677         spin_unlock(&obd->obd_dev_lock);
1678
1679         spin_lock(&obd->obd_recovery_task_lock);
1680         target_cancel_recovery_timer(obd);
1681         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1682         spin_unlock(&obd->obd_recovery_task_lock);
1683
1684         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1685                 LASSERT(req->rq_reply_state == NULL);
1686                 target_exp_dequeue_req_replay(req);
1687                 target_request_copy_put(req);
1688         }
1689
1690         spin_lock(&obd->obd_recovery_task_lock);
1691         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1692         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1693         spin_unlock(&obd->obd_recovery_task_lock);
1694
1695         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1696                 LASSERT(req->rq_reply_state == NULL);
1697                 target_request_copy_put(req);
1698         }
1699
1700         EXIT;
1701 }
1702 EXPORT_SYMBOL(target_cleanup_recovery);
1703
1704 /* obd_recovery_task_lock should be held */
1705 void target_cancel_recovery_timer(struct obd_device *obd)
1706 {
1707         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1708         cfs_timer_disarm(&obd->obd_recovery_timer);
1709 }
1710
1711 static void target_start_recovery_timer(struct obd_device *obd)
1712 {
1713         if (obd->obd_recovery_start != 0)
1714                 return;
1715
1716         spin_lock(&obd->obd_dev_lock);
1717         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1718                 spin_unlock(&obd->obd_dev_lock);
1719                 return;
1720         }
1721
1722         LASSERT(obd->obd_recovery_timeout != 0);
1723
1724         if (obd->obd_recovery_start != 0) {
1725                 spin_unlock(&obd->obd_dev_lock);
1726                 return;
1727         }
1728
1729         cfs_timer_arm(&obd->obd_recovery_timer,
1730                       cfs_time_shift(obd->obd_recovery_timeout));
1731         obd->obd_recovery_start = cfs_time_current_sec();
1732         spin_unlock(&obd->obd_dev_lock);
1733
1734         LCONSOLE_WARN("%s: Will be in recovery for at least %d:%.02d, "
1735                       "or until %d client%s reconnect%s\n",
1736                       obd->obd_name,
1737                       obd->obd_recovery_timeout / 60,
1738                       obd->obd_recovery_timeout % 60,
1739                       obd->obd_max_recoverable_clients,
1740                       (obd->obd_max_recoverable_clients == 1) ? "" : "s",
1741                       (obd->obd_max_recoverable_clients == 1) ? "s": "");
1742 }
1743
1744 /**
1745  * extend recovery window.
1746  *
1747  * if @extend is true, extend recovery window to have @drt remaining at least;
1748  * otherwise, make sure the recovery timeout value is not less than @drt.
1749  */
1750 static void extend_recovery_timer(struct obd_device *obd, int drt, bool extend)
1751 {
1752         cfs_time_t now;
1753         cfs_time_t end;
1754         cfs_duration_t left;
1755         int to;
1756
1757         spin_lock(&obd->obd_dev_lock);
1758         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1759                 spin_unlock(&obd->obd_dev_lock);
1760                 return;
1761         }
1762         LASSERT(obd->obd_recovery_start != 0);
1763
1764         now  = cfs_time_current_sec();
1765         to   = obd->obd_recovery_timeout;
1766         end  = obd->obd_recovery_start + to;
1767         left = cfs_time_sub(end, now);
1768
1769         if (extend && (drt > left)) {
1770                 to += drt - left;
1771         } else if (!extend && (drt > to)) {
1772                 to = drt;
1773         }
1774
1775         if (to > obd->obd_recovery_time_hard)
1776                 to = obd->obd_recovery_time_hard;
1777         if (obd->obd_recovery_timeout < to) {
1778                 obd->obd_recovery_timeout = to;
1779                 end = obd->obd_recovery_start + to;
1780                 cfs_timer_arm(&obd->obd_recovery_timer,
1781                                 cfs_time_shift(end - now));
1782         }
1783         spin_unlock(&obd->obd_dev_lock);
1784
1785         CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
1786                 obd->obd_name, (unsigned)cfs_time_sub(end, now));
1787 }
1788
1789 /* Reset the timer with each new client connection */
1790 /*
1791  * This timer is actually reconnect_timer, which is for making sure
1792  * the total recovery window is at least as big as my reconnect
1793  * attempt timing. So the initial recovery time_out will be set to
1794  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1795  * from client is bigger than this, then the recovery time_out will
1796  * be extended to make sure the client could be reconnected, in the
1797  * process, the timeout from the new client should be ignored.
1798  */
1799
1800 static void
1801 check_and_start_recovery_timer(struct obd_device *obd,
1802                                struct ptlrpc_request *req,
1803                                int new_client)
1804 {
1805         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1806         struct obd_device_target *obt = &obd->u.obt;
1807
1808         if (!new_client && service_time)
1809                 /* Teach server about old server's estimates, as first guess
1810                  * at how long new requests will take. */
1811                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
1812                             service_time);
1813
1814         target_start_recovery_timer(obd);
1815
1816         /* Convert the service time to RPC timeout,
1817          * and reuse service_time to limit stack usage. */
1818         service_time = at_est2timeout(service_time);
1819
1820         /* We expect other clients to timeout within service_time, then try
1821          * to reconnect, then try the failover server.  The max delay between
1822          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL. */
1823         service_time += 2 * INITIAL_CONNECT_TIMEOUT;
1824
1825         LASSERT(obt->obt_magic == OBT_MAGIC);
1826         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
1827         if (service_time > obd->obd_recovery_timeout && !new_client)
1828                 extend_recovery_timer(obd, service_time, false);
1829 }
1830
1831 /** Health checking routines */
1832 static inline int exp_connect_healthy(struct obd_export *exp)
1833 {
1834         return (exp->exp_in_recovery);
1835 }
1836
1837 /** if export done req_replay or has replay in queue */
1838 static inline int exp_req_replay_healthy(struct obd_export *exp)
1839 {
1840         return (!exp->exp_req_replay_needed ||
1841                 atomic_read(&exp->exp_replay_count) > 0);
1842 }
1843
1844
1845 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
1846 {
1847         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1848                exp_req_replay_healthy(exp);
1849 }
1850
1851 /** if export done lock_replay or has replay in queue */
1852 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1853 {
1854         return (!exp->exp_lock_replay_needed ||
1855                 atomic_read(&exp->exp_replay_count) > 0);
1856 }
1857
1858 static inline int exp_vbr_healthy(struct obd_export *exp)
1859 {
1860         return (!exp->exp_vbr_failed);
1861 }
1862
1863 static inline int exp_finished(struct obd_export *exp)
1864 {
1865         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1866 }
1867
1868 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
1869 {
1870         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1871                 exp_finished(exp);
1872 }
1873
1874 static int check_for_next_transno(struct lu_target *lut)
1875 {
1876         struct ptlrpc_request *req = NULL;
1877         struct obd_device *obd = lut->lut_obd;
1878         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
1879         int wake_up = 0, connected, completed, queue_len;
1880         __u64 req_transno = 0;
1881         __u64 update_transno = 0;
1882         __u64 next_transno = 0;
1883         ENTRY;
1884
1885         spin_lock(&obd->obd_recovery_task_lock);
1886         if (!list_empty(&obd->obd_req_replay_queue)) {
1887                 req = list_entry(obd->obd_req_replay_queue.next,
1888                                      struct ptlrpc_request, rq_list);
1889                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1890         }
1891
1892         if (tdtd != NULL)
1893                 update_transno = distribute_txn_get_next_transno(tdtd);
1894
1895         connected = atomic_read(&obd->obd_connected_clients);
1896         completed = connected - atomic_read(&obd->obd_req_replay_clients);
1897         queue_len = obd->obd_requests_queued_for_recovery;
1898         next_transno = obd->obd_next_recovery_transno;
1899
1900         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1901                "req_transno: %llu, next_transno: %llu\n",
1902                obd->obd_max_recoverable_clients, connected, completed,
1903                queue_len, req_transno, next_transno);
1904
1905         if (obd->obd_abort_recovery) {
1906                 CDEBUG(D_HA, "waking for aborted recovery\n");
1907                 wake_up = 1;
1908         } else if (obd->obd_recovery_expired) {
1909                 CDEBUG(D_HA, "waking for expired recovery\n");
1910                 wake_up = 1;
1911         } else if (tdtd != NULL && req != NULL &&
1912                    is_req_replayed_by_update(req)) {
1913                 LASSERTF(req_transno < next_transno, "req_transno %llu"
1914                          "next_transno%llu\n", req_transno, next_transno);
1915                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
1916                        req_transno);
1917                 wake_up = 1;
1918         } else if (req_transno == next_transno ||
1919                    (update_transno != 0 && update_transno <= next_transno)) {
1920                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
1921                 wake_up = 1;
1922         } else if (queue_len > 0 &&
1923                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1924                 /** handle gaps occured due to lost reply or VBR */
1925                 LASSERTF(req_transno >= next_transno,
1926                          "req_transno: %llu, next_transno: %llu\n",
1927                          req_transno, next_transno);
1928                 CDEBUG(D_HA,
1929                        "%s: waking for gap in transno, VBR is %s (skip: "
1930                        "%lld, ql: %d, comp: %d, conn: %d, next: %lld"
1931                        ", next_update %lld last_committed: %lld)\n",
1932                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1933                        next_transno, queue_len, completed, connected,
1934                        req_transno, update_transno, obd->obd_last_committed);
1935                 obd->obd_next_recovery_transno = req_transno;
1936                 wake_up = 1;
1937         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1938                 CDEBUG(D_HA, "waking for completed recovery\n");
1939                 wake_up = 1;
1940         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1941                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1942                        " by fail_lock, waking up (%lld)\n", next_transno);
1943                 obd->obd_next_recovery_transno = req_transno;
1944                 wake_up = 1;
1945         }
1946         spin_unlock(&obd->obd_recovery_task_lock);
1947         return wake_up;
1948 }
1949
1950 static int check_for_next_lock(struct lu_target *lut)
1951 {
1952         struct obd_device *obd = lut->lut_obd;
1953         int wake_up = 0;
1954
1955         spin_lock(&obd->obd_recovery_task_lock);
1956         if (!list_empty(&obd->obd_lock_replay_queue)) {
1957                 CDEBUG(D_HA, "waking for next lock\n");
1958                 wake_up = 1;
1959         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1960                 CDEBUG(D_HA, "waking for completed lock replay\n");
1961                 wake_up = 1;
1962         } else if (obd->obd_abort_recovery) {
1963                 CDEBUG(D_HA, "waking for aborted recovery\n");
1964                 wake_up = 1;
1965         } else if (obd->obd_recovery_expired) {
1966                 CDEBUG(D_HA, "waking for expired recovery\n");
1967                 wake_up = 1;
1968         }
1969         spin_unlock(&obd->obd_recovery_task_lock);
1970
1971         return wake_up;
1972 }
1973
1974 /**
1975  * wait for recovery events,
1976  * check its status with help of check_routine
1977  * evict dead clients via health_check
1978  */
1979 static int target_recovery_overseer(struct lu_target *lut,
1980                                     int (*check_routine)(struct lu_target *),
1981                                     int (*health_check)(struct obd_export *))
1982 {
1983         struct obd_device       *obd = lut->lut_obd;
1984         struct target_distribute_txn_data *tdtd;
1985 repeat:
1986         if ((obd->obd_recovery_start != 0) && (cfs_time_current_sec() >=
1987               (obd->obd_recovery_start + obd->obd_recovery_time_hard))) {
1988                 __u64 next_update_transno = 0;
1989
1990                 /* Only abort the recovery if there are no update recovery
1991                  * left in the queue */
1992                 spin_lock(&obd->obd_recovery_task_lock);
1993                 if (lut->lut_tdtd != NULL) {
1994                         next_update_transno =
1995                                 distribute_txn_get_next_transno(lut->lut_tdtd);
1996
1997                         tdtd = lut->lut_tdtd;
1998                         /* If next_update_transno == 0, it probably because
1999                          * updatelog retrieve threads did not get any records
2000                          * yet, let's wait those threads stopped */
2001                         if (next_update_transno == 0) {
2002                                 struct l_wait_info lwi = { 0 };
2003
2004                                 l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2005                                        atomic_read(
2006                                        &tdtd->tdtd_recovery_threads_count) == 0,
2007                                        &lwi);
2008
2009                                 next_update_transno =
2010                                         distribute_txn_get_next_transno(
2011                                                                 lut->lut_tdtd);
2012                         }
2013                 }
2014
2015                 if (next_update_transno != 0 && !obd->obd_abort_recovery) {
2016                         obd->obd_next_recovery_transno = next_update_transno;
2017                         spin_unlock(&obd->obd_recovery_task_lock);
2018                         /* Disconnect unfinished exports from clients, and
2019                          * keep connection from MDT to make sure the update
2020                          * recovery will still keep trying until some one
2021                          * manually abort the recovery */
2022                         class_disconnect_stale_exports(obd,
2023                                                 exp_finished_or_from_mdt);
2024                         /* Abort all of replay and replay lock req from
2025                          * clients */
2026                         abort_req_replay_queue(obd);
2027                         abort_lock_replay_queue(obd);
2028                         CDEBUG(D_HA, "%s: there are still update replay (%#llx"
2029                                ")in the queue.\n", obd->obd_name,
2030                                next_update_transno);
2031                 } else {
2032                         obd->obd_abort_recovery = 1;
2033                         spin_unlock(&obd->obd_recovery_task_lock);
2034                         CWARN("%s recovery is aborted by hard timeout\n",
2035                               obd->obd_name);
2036                 }
2037         }
2038
2039         while (wait_event_timeout(obd->obd_next_transno_waitq,
2040                                   check_routine(lut),
2041                                   msecs_to_jiffies(60 * MSEC_PER_SEC)) == 0)
2042                 /* wait indefinitely for event, but don't trigger watchdog */;
2043
2044         if (obd->obd_abort_recovery) {
2045                 CWARN("recovery is aborted, evict exports in recovery\n");
2046                 if (lut->lut_tdtd != NULL) {
2047                         struct l_wait_info lwi = { 0 };
2048
2049                         tdtd = lut->lut_tdtd;
2050                         /* Let's wait all of the update log recovery thread
2051                          * finished */
2052                         l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2053                          atomic_read(&tdtd->tdtd_recovery_threads_count) == 0,
2054                              &lwi);
2055                         /* Then abort the update recovery list */
2056                         dtrq_list_destroy(lut->lut_tdtd);
2057                 }
2058
2059                 /** evict exports which didn't finish recovery yet */
2060                 class_disconnect_stale_exports(obd, exp_finished);
2061                 return 1;
2062         } else if (obd->obd_recovery_expired) {
2063                 obd->obd_recovery_expired = 0;
2064                 /** If some clients died being recovered, evict them */
2065                 LCONSOLE_WARN("%s: recovery is timed out, "
2066                               "evict stale exports\n", obd->obd_name);
2067                 /** evict cexports with no replay in queue, they are stalled */
2068                 class_disconnect_stale_exports(obd, health_check);
2069
2070                 /** continue with VBR */
2071                 spin_lock(&obd->obd_dev_lock);
2072                 obd->obd_version_recov = 1;
2073                 spin_unlock(&obd->obd_dev_lock);
2074                 /**
2075                  * reset timer, recovery will proceed with versions now,
2076                  * timeout is set just to handle reconnection delays
2077                  */
2078                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2079                 /** Wait for recovery events again, after evicting bad clients */
2080                 goto repeat;
2081         }
2082         return 0;
2083 }
2084
2085 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2086 {
2087         struct obd_device       *obd = lut->lut_obd;
2088         struct ptlrpc_request *req = NULL;
2089
2090         CDEBUG(D_HA, "Waiting for lock\n");
2091         if (target_recovery_overseer(lut, check_for_next_lock,
2092                                      exp_lock_replay_healthy))
2093                 abort_lock_replay_queue(obd);
2094
2095         spin_lock(&obd->obd_recovery_task_lock);
2096         if (!list_empty(&obd->obd_lock_replay_queue)) {
2097                 req = list_entry(obd->obd_lock_replay_queue.next,
2098                                      struct ptlrpc_request, rq_list);
2099                 list_del_init(&req->rq_list);
2100                 spin_unlock(&obd->obd_recovery_task_lock);
2101         } else {
2102                 spin_unlock(&obd->obd_recovery_task_lock);
2103                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2104                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2105                 /** evict exports failed VBR */
2106                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2107         }
2108         return req;
2109 }
2110
2111 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2112 {
2113         struct ptlrpc_request *req = NULL;
2114
2115         spin_lock(&obd->obd_recovery_task_lock);
2116         if (!list_empty(&obd->obd_final_req_queue)) {
2117                 req = list_entry(obd->obd_final_req_queue.next,
2118                                      struct ptlrpc_request, rq_list);
2119                 list_del_init(&req->rq_list);
2120                 spin_unlock(&obd->obd_recovery_task_lock);
2121                 if (req->rq_export->exp_in_recovery) {
2122                         spin_lock(&req->rq_export->exp_lock);
2123                         req->rq_export->exp_in_recovery = 0;
2124                         spin_unlock(&req->rq_export->exp_lock);
2125                 }
2126         } else {
2127                 spin_unlock(&obd->obd_recovery_task_lock);
2128         }
2129         return req;
2130 }
2131
2132 static void handle_recovery_req(struct ptlrpc_thread *thread,
2133                                 struct ptlrpc_request *req,
2134                                 svc_handler_t handler)
2135 {
2136         ENTRY;
2137
2138         /**
2139          * export can be evicted during recovery, no need to handle replays for
2140          * it after that, discard such request silently
2141          */
2142         if (req->rq_export->exp_disconnected)
2143                 RETURN_EXIT;
2144
2145         req->rq_session.lc_thread = thread;
2146         req->rq_svc_thread = thread;
2147         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2148
2149         /* thread context */
2150         lu_context_enter(&thread->t_env->le_ctx);
2151         (void)handler(req);
2152         lu_context_exit(&thread->t_env->le_ctx);
2153
2154         /* don't reset timer for final stage */
2155         if (!exp_finished(req->rq_export)) {
2156                 int to = obd_timeout;
2157
2158                 /**
2159                  * Add request timeout to the recovery time so next request from
2160                  * this client may come in recovery time
2161                  */
2162                 if (!AT_OFF) {
2163                         struct ptlrpc_service_part *svcpt;
2164
2165                         svcpt = req->rq_rqbd->rqbd_svcpt;
2166                         /* If the server sent early reply for this request,
2167                          * the client will recalculate the timeout according to
2168                          * current server estimate service time, so we will
2169                          * use the maxium timeout here for waiting the client
2170                          * sending the next req */
2171                         to = max((int)at_est2timeout(
2172                                  at_get(&svcpt->scp_at_estimate)),
2173                                  (int)lustre_msg_get_timeout(req->rq_reqmsg));
2174                         /* Add 2 net_latency, one for balance rq_deadline
2175                          * (see ptl_send_rpc), one for resend the req to server,
2176                          * Note: client will pack net_latency in replay req
2177                          * (see ptlrpc_replay_req) */
2178                         to += 2 * lustre_msg_get_service_time(req->rq_reqmsg);
2179                 }
2180                 extend_recovery_timer(class_exp2obd(req->rq_export), to, true);
2181         }
2182         EXIT;
2183 }
2184
2185 /** Checking routines for recovery */
2186 static int check_for_recovery_ready(struct lu_target *lut)
2187 {
2188         struct obd_device *obd = lut->lut_obd;
2189         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2190
2191         CDEBUG(D_HA, "connected %d stale %d max_recoverable_clients %d"
2192                " abort %d expired %d\n", clnts, obd->obd_stale_clients,
2193                obd->obd_max_recoverable_clients, obd->obd_abort_recovery,
2194                obd->obd_recovery_expired);
2195
2196         if (!obd->obd_abort_recovery && !obd->obd_recovery_expired) {
2197                 LASSERT(clnts <= obd->obd_max_recoverable_clients);
2198                 if (clnts + obd->obd_stale_clients <
2199                     obd->obd_max_recoverable_clients)
2200                         return 0;
2201         }
2202
2203         if (lut->lut_tdtd != NULL) {
2204                 if (!lut->lut_tdtd->tdtd_replay_ready &&
2205                     !obd->obd_abort_recovery) {
2206                         /* Let's extend recovery timer, in case the recovery
2207                          * timer expired, and some clients got evicted */
2208                         extend_recovery_timer(obd, obd->obd_recovery_timeout,
2209                                               true);
2210                         CDEBUG(D_HA, "%s update recovery is not ready,"
2211                                " extend recovery %d\n", obd->obd_name,
2212                                obd->obd_recovery_timeout);
2213                         return 0;
2214                 }
2215         }
2216
2217         return 1;
2218 }
2219
2220 enum {
2221         REQUEST_RECOVERY = 1,
2222         UPDATE_RECOVERY = 2,
2223 };
2224
2225 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2226 {
2227         __u64 transno = 0;
2228
2229         if (!list_empty(&obd->obd_req_replay_queue)) {
2230                 struct ptlrpc_request *req;
2231
2232                 req = list_entry(obd->obd_req_replay_queue.next,
2233                                  struct ptlrpc_request, rq_list);
2234                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2235         }
2236
2237         return transno;
2238 }
2239
2240 static __u64 get_next_transno(struct lu_target *lut, int *type)
2241 {
2242         struct obd_device *obd = lut->lut_obd;
2243         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2244         __u64 transno = 0;
2245         __u64 update_transno;
2246         ENTRY;
2247
2248         transno = get_next_replay_req_transno(obd);
2249         if (type != NULL)
2250                 *type = REQUEST_RECOVERY;
2251
2252         if (tdtd == NULL)
2253                 RETURN(transno);
2254
2255         update_transno = distribute_txn_get_next_transno(tdtd);
2256         if (transno == 0 || (transno >= update_transno &&
2257                              update_transno != 0)) {
2258                 transno = update_transno;
2259                 if (type != NULL)
2260                         *type = UPDATE_RECOVERY;
2261         }
2262
2263         RETURN(transno);
2264 }
2265
2266 /**
2267  * drop duplicate replay request
2268  *
2269  * Because the operation has been replayed by update recovery, the request
2270  * with the same transno will be dropped and also notify the client to send
2271  * next replay request.
2272  *
2273  * \param[in] env       execution environment
2274  * \param[in] obd       failover obd device
2275  * \param[in] req       request to be dropped
2276  */
2277 static void drop_duplicate_replay_req(struct lu_env *env,
2278                                       struct obd_device *obd,
2279                                       struct ptlrpc_request *req)
2280 {
2281         DEBUG_REQ(D_HA, req, "remove t%lld from %s because of duplicate"
2282                   " update records are found.\n",
2283                   lustre_msg_get_transno(req->rq_reqmsg),
2284                   libcfs_nid2str(req->rq_peer.nid));
2285
2286         /* Right now, only for MDS reint operation update replay and
2287          * normal request replay can have the same transno */
2288         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT) {
2289                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2290                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2291                 if (likely(req->rq_export))
2292                         target_committed_to_req(req);
2293                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2294                 target_send_reply(req, req->rq_status, 0);
2295         } else {
2296                 DEBUG_REQ(D_ERROR, req, "wrong opc" "from %s\n",
2297                 libcfs_nid2str(req->rq_peer.nid));
2298         }
2299         target_exp_dequeue_req_replay(req);
2300         target_request_copy_put(req);
2301         obd->obd_replayed_requests++;
2302 }
2303
2304 static void replay_request_or_update(struct lu_env *env,
2305                                      struct lu_target *lut,
2306                                      struct target_recovery_data *trd,
2307                                      struct ptlrpc_thread *thread)
2308 {
2309         struct obd_device *obd = lut->lut_obd;
2310         struct ptlrpc_request *req = NULL;
2311         int                     type;
2312         __u64                   transno;
2313         ENTRY;
2314
2315         CDEBUG(D_HA, "Waiting for transno %lld\n",
2316                obd->obd_next_recovery_transno);
2317
2318         /* Replay all of request and update by transno */
2319         do {
2320                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2321
2322                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2323
2324                 /** It is needed to extend recovery window above
2325                  *  recovery_time_soft. Extending is possible only in the
2326                  *  end of recovery window (see more details in
2327                  *  handle_recovery_req()).
2328                  */
2329                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2330
2331                 if (target_recovery_overseer(lut, check_for_next_transno,
2332                                         exp_req_replay_healthy_or_from_mdt)) {
2333                         abort_req_replay_queue(obd);
2334                         abort_lock_replay_queue(obd);
2335                         goto abort;
2336                 }
2337
2338                 spin_lock(&obd->obd_recovery_task_lock);
2339                 transno = get_next_transno(lut, &type);
2340                 if (type == REQUEST_RECOVERY && transno != 0) {
2341                         /* Drop replay request from client side, if the
2342                          * replay has been executed by update with the
2343                          * same transno */
2344                         req = list_entry(obd->obd_req_replay_queue.next,
2345                                         struct ptlrpc_request, rq_list);
2346
2347                         list_del_init(&req->rq_list);
2348                         obd->obd_requests_queued_for_recovery--;
2349                         spin_unlock(&obd->obd_recovery_task_lock);
2350
2351                         /* Let's check if the request has been redone by
2352                          * update replay */
2353                         if (is_req_replayed_by_update(req)) {
2354                                 struct distribute_txn_replay_req *dtrq;
2355
2356                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2357                                                                    req->rq_xid);
2358                                 LASSERT(dtrq != NULL);
2359                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2360                                 list_del_init(&dtrq->dtrq_list);
2361                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2362                                 dtrq_destroy(dtrq);
2363
2364                                 drop_duplicate_replay_req(env, obd, req);
2365
2366                                 continue;
2367                         }
2368
2369                         LASSERT(trd->trd_processing_task == current_pid());
2370                         DEBUG_REQ(D_HA, req, "processing t%lld from %s",
2371                                   lustre_msg_get_transno(req->rq_reqmsg),
2372                                   libcfs_nid2str(req->rq_peer.nid));
2373
2374                         handle_recovery_req(thread, req,
2375                                             trd->trd_recovery_handler);
2376                         /**
2377                          * bz18031: increase next_recovery_transno before
2378                          * target_request_copy_put() will drop exp_rpc reference
2379                          */
2380                         spin_lock(&obd->obd_recovery_task_lock);
2381                         obd->obd_next_recovery_transno++;
2382                         spin_unlock(&obd->obd_recovery_task_lock);
2383                         target_exp_dequeue_req_replay(req);
2384                         target_request_copy_put(req);
2385                         obd->obd_replayed_requests++;
2386                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2387                         struct distribute_txn_replay_req *dtrq;
2388                         int rc;
2389
2390                         spin_unlock(&obd->obd_recovery_task_lock);
2391
2392                         LASSERT(tdtd != NULL);
2393                         dtrq = distribute_txn_get_next_req(tdtd);
2394                         lu_context_enter(&thread->t_env->le_ctx);
2395                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2396                         lu_context_exit(&thread->t_env->le_ctx);
2397                         extend_recovery_timer(obd, obd_timeout, true);
2398
2399                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2400                                 CDEBUG(D_HA, "Move x%llu t%llu"
2401                                        " to finish list\n", dtrq->dtrq_xid,
2402                                        dtrq->dtrq_master_transno);
2403
2404                                 /* Add it to the replay finish list */
2405                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2406                                 list_add(&dtrq->dtrq_list,
2407                                          &tdtd->tdtd_replay_finish_list);
2408                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2409
2410                                 spin_lock(&obd->obd_recovery_task_lock);
2411                                 if (transno == obd->obd_next_recovery_transno)
2412                                         obd->obd_next_recovery_transno++;
2413                                 else if (transno >
2414                                          obd->obd_next_recovery_transno)
2415                                         obd->obd_next_recovery_transno =
2416                                                                 transno + 1;
2417                                 spin_unlock(&obd->obd_recovery_task_lock);
2418                         } else {
2419                                 dtrq_destroy(dtrq);
2420                         }
2421                 } else {
2422                         spin_unlock(&obd->obd_recovery_task_lock);
2423 abort:
2424                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2425                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2426                         /** evict exports failed VBR */
2427                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2428                         break;
2429                 }
2430         } while (1);
2431 }
2432
2433 static int target_recovery_thread(void *arg)
2434 {
2435         struct lu_target *lut = arg;
2436         struct obd_device *obd = lut->lut_obd;
2437         struct ptlrpc_request *req;
2438         struct target_recovery_data *trd = &obd->obd_recovery_data;
2439         unsigned long delta;
2440         struct lu_env *env;
2441         struct ptlrpc_thread *thread = NULL;
2442         int rc = 0;
2443         ENTRY;
2444
2445         unshare_fs_struct();
2446         OBD_ALLOC_PTR(thread);
2447         if (thread == NULL)
2448                 RETURN(-ENOMEM);
2449
2450         OBD_ALLOC_PTR(env);
2451         if (env == NULL) {
2452                 OBD_FREE_PTR(thread);
2453                 RETURN(-ENOMEM);
2454         }
2455
2456         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2457         if (rc) {
2458                 OBD_FREE_PTR(thread);
2459                 OBD_FREE_PTR(env);
2460                 RETURN(rc);
2461         }
2462
2463         thread->t_env = env;
2464         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2465         env->le_ctx.lc_thread = thread;
2466         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2467         thread->t_watchdog = NULL;
2468
2469         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2470                current_pid());
2471         trd->trd_processing_task = current_pid();
2472
2473         spin_lock(&obd->obd_dev_lock);
2474         obd->obd_recovering = 1;
2475         spin_unlock(&obd->obd_dev_lock);
2476         complete(&trd->trd_starting);
2477
2478         /* first of all, we have to know the first transno to replay */
2479         if (target_recovery_overseer(lut, check_for_recovery_ready,
2480                                      exp_connect_healthy)) {
2481                 abort_req_replay_queue(obd);
2482                 abort_lock_replay_queue(obd);
2483                 if (lut->lut_tdtd != NULL)
2484                         dtrq_list_destroy(lut->lut_tdtd);
2485         }
2486
2487         /* next stage: replay requests or update */
2488         delta = jiffies;
2489         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2490                atomic_read(&obd->obd_req_replay_clients),
2491                obd->obd_next_recovery_transno);
2492         replay_request_or_update(env, lut, trd, thread);
2493
2494         /**
2495          * The second stage: replay locks
2496          */
2497         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2498                atomic_read(&obd->obd_lock_replay_clients));
2499         while ((req = target_next_replay_lock(lut))) {
2500                 LASSERT(trd->trd_processing_task == current_pid());
2501                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
2502                           libcfs_nid2str(req->rq_peer.nid));
2503                 handle_recovery_req(thread, req,
2504                                     trd->trd_recovery_handler);
2505                 target_request_copy_put(req);
2506                 obd->obd_replayed_locks++;
2507         }
2508
2509         /**
2510          * The third stage: reply on final pings, at this moment all clients
2511          * must have request in final queue
2512          */
2513         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2514         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2515         /** Update server last boot epoch */
2516         tgt_boot_epoch_update(lut);
2517         /* We drop recoverying flag to forward all new requests
2518          * to regular mds_handle() since now */
2519         spin_lock(&obd->obd_dev_lock);
2520         obd->obd_recovering = obd->obd_abort_recovery = 0;
2521         spin_unlock(&obd->obd_dev_lock);
2522         spin_lock(&obd->obd_recovery_task_lock);
2523         target_cancel_recovery_timer(obd);
2524         spin_unlock(&obd->obd_recovery_task_lock);
2525         while ((req = target_next_final_ping(obd))) {
2526                 LASSERT(trd->trd_processing_task == current_pid());
2527                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
2528                           libcfs_nid2str(req->rq_peer.nid));
2529                 handle_recovery_req(thread, req,
2530                                     trd->trd_recovery_handler);
2531                 /* Because the waiting client can not send ping to server,
2532                  * so we need refresh the last_request_time, to avoid the
2533                  * export is being evicted */
2534                 ptlrpc_update_export_timer(req->rq_export, 0);
2535                 target_request_copy_put(req);
2536         }
2537
2538         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2539         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
2540               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2541         if (delta > OBD_RECOVERY_TIME_SOFT) {
2542                 CWARN("too long recovery - read logs\n");
2543                 libcfs_debug_dumplog();
2544         }
2545
2546         target_finish_recovery(lut);
2547
2548         lu_context_fini(&env->le_ctx);
2549         trd->trd_processing_task = 0;
2550         complete(&trd->trd_finishing);
2551
2552         tgt_io_thread_done(thread);
2553         OBD_FREE_PTR(thread);
2554         OBD_FREE_PTR(env);
2555         RETURN(rc);
2556 }
2557
2558 static int target_start_recovery_thread(struct lu_target *lut,
2559                                         svc_handler_t handler)
2560 {
2561         struct obd_device *obd = lut->lut_obd;
2562         int rc = 0;
2563         struct target_recovery_data *trd = &obd->obd_recovery_data;
2564         int index;
2565
2566         memset(trd, 0, sizeof(*trd));
2567         init_completion(&trd->trd_starting);
2568         init_completion(&trd->trd_finishing);
2569         trd->trd_recovery_handler = handler;
2570
2571         rc = server_name2index(obd->obd_name, &index, NULL);
2572         if (rc < 0)
2573                 return rc;
2574
2575         if (!IS_ERR(kthread_run(target_recovery_thread,
2576                                 lut, "tgt_recover_%d", index))) {
2577                 wait_for_completion(&trd->trd_starting);
2578                 LASSERT(obd->obd_recovering != 0);
2579         } else {
2580                 rc = -ECHILD;
2581         }
2582
2583         return rc;
2584 }
2585
2586 void target_stop_recovery_thread(struct obd_device *obd)
2587 {
2588         if (obd->obd_recovery_data.trd_processing_task > 0) {
2589                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2590                 /** recovery can be done but postrecovery is not yet */
2591                 spin_lock(&obd->obd_dev_lock);
2592                 if (obd->obd_recovering) {
2593                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2594                         obd->obd_abort_recovery = 1;
2595                         wake_up(&obd->obd_next_transno_waitq);
2596                 }
2597                 spin_unlock(&obd->obd_dev_lock);
2598                 wait_for_completion(&trd->trd_finishing);
2599         }
2600 }
2601 EXPORT_SYMBOL(target_stop_recovery_thread);
2602
2603 void target_recovery_fini(struct obd_device *obd)
2604 {
2605         class_disconnect_exports(obd);
2606         target_stop_recovery_thread(obd);
2607         target_cleanup_recovery(obd);
2608 }
2609 EXPORT_SYMBOL(target_recovery_fini);
2610
2611 static void target_recovery_expired(unsigned long castmeharder)
2612 {
2613         struct obd_device *obd = (struct obd_device *)castmeharder;
2614         CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
2615                " after %lds (%d clients connected)\n",
2616                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2617                cfs_time_current_sec()- obd->obd_recovery_start,
2618                atomic_read(&obd->obd_connected_clients));
2619
2620         obd->obd_recovery_expired = 1;
2621         wake_up(&obd->obd_next_transno_waitq);
2622 }
2623
2624 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2625 {
2626         struct obd_device *obd = lut->lut_obd;
2627
2628         if (obd->obd_max_recoverable_clients == 0) {
2629                 /** Update server last boot epoch */
2630                 tgt_boot_epoch_update(lut);
2631                 return;
2632         }
2633
2634         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2635                "last_transno %llu\n", obd->obd_name,
2636                obd->obd_max_recoverable_clients, obd->obd_last_committed);
2637         LASSERT(obd->obd_stopping == 0);
2638         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2639         obd->obd_recovery_start = 0;
2640         obd->obd_recovery_end = 0;
2641
2642         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
2643         target_start_recovery_thread(lut, handler);
2644 }
2645 EXPORT_SYMBOL(target_recovery_init);
2646
2647 static int target_process_req_flags(struct obd_device *obd,
2648                                     struct ptlrpc_request *req)
2649 {
2650         struct obd_export *exp = req->rq_export;
2651         LASSERT(exp != NULL);
2652         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2653                 /* client declares he's ready to replay locks */
2654                 spin_lock(&exp->exp_lock);
2655                 if (exp->exp_req_replay_needed) {
2656                         exp->exp_req_replay_needed = 0;
2657                         spin_unlock(&exp->exp_lock);
2658
2659                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2660                         atomic_dec(&obd->obd_req_replay_clients);
2661                 } else {
2662                         spin_unlock(&exp->exp_lock);
2663                 }
2664         }
2665         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2666                 /* client declares he's ready to complete recovery
2667                  * so, we put the request on th final queue */
2668                 spin_lock(&exp->exp_lock);
2669                 if (exp->exp_lock_replay_needed) {
2670                         exp->exp_lock_replay_needed = 0;
2671                         spin_unlock(&exp->exp_lock);
2672
2673                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
2674                         atomic_dec(&obd->obd_lock_replay_clients);
2675                 } else {
2676                         spin_unlock(&exp->exp_lock);
2677                 }
2678         }
2679         return 0;
2680 }
2681
2682 int target_queue_recovery_request(struct ptlrpc_request *req,
2683                                   struct obd_device *obd)
2684 {
2685         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
2686         struct ptlrpc_request *reqiter;
2687         int inserted = 0;
2688         ENTRY;
2689
2690         if (obd->obd_recovery_data.trd_processing_task == current_pid()) {
2691                 /* Processing the queue right now, don't re-add. */
2692                 RETURN(1);
2693         }
2694
2695         target_process_req_flags(obd, req);
2696
2697         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2698                 /* client declares he's ready to complete recovery
2699                  * so, we put the request on th final queue */
2700                 target_request_copy_get(req);
2701                 DEBUG_REQ(D_HA, req, "queue final req");
2702                 wake_up(&obd->obd_next_transno_waitq);
2703                 spin_lock(&obd->obd_recovery_task_lock);
2704                 if (obd->obd_recovering) {
2705                         struct ptlrpc_request *tmp;
2706                         struct ptlrpc_request *duplicate = NULL;
2707
2708                         if (likely(!req->rq_export->exp_replay_done)) {
2709                                 req->rq_export->exp_replay_done = 1;
2710                                 list_add_tail(&req->rq_list,
2711                                               &obd->obd_final_req_queue);
2712                                 spin_unlock(&obd->obd_recovery_task_lock);
2713                                 RETURN(0);
2714                         }
2715
2716                         /* XXX O(n), but only happens if final ping is
2717                          * timed out, probably reorganize the list as
2718                          * a hash list later */
2719                         list_for_each_entry_safe(reqiter, tmp,
2720                                                  &obd->obd_final_req_queue,
2721                                                  rq_list) {
2722                                 if (reqiter->rq_export == req->rq_export) {
2723                                         list_del_init(&reqiter->rq_list);
2724                                         duplicate = reqiter;
2725                                         break;
2726                                 }
2727                         }
2728
2729                         list_add_tail(&req->rq_list,
2730                                       &obd->obd_final_req_queue);
2731                         req->rq_export->exp_replay_done = 1;
2732                         spin_unlock(&obd->obd_recovery_task_lock);
2733
2734                         if (duplicate != NULL) {
2735                                 DEBUG_REQ(D_HA, duplicate,
2736                                           "put prev final req\n");
2737                                 target_request_copy_put(duplicate);
2738                         }
2739                         RETURN(0);
2740                 } else {
2741                         spin_unlock(&obd->obd_recovery_task_lock);
2742                         target_request_copy_put(req);
2743                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
2744                 }
2745         }
2746         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2747                 /* client declares he's ready to replay locks */
2748                 target_request_copy_get(req);
2749                 DEBUG_REQ(D_HA, req, "queue lock replay req");
2750                 wake_up(&obd->obd_next_transno_waitq);
2751                 spin_lock(&obd->obd_recovery_task_lock);
2752                 LASSERT(obd->obd_recovering);
2753                 /* usually due to recovery abort */
2754                 if (!req->rq_export->exp_in_recovery) {
2755                         spin_unlock(&obd->obd_recovery_task_lock);
2756                         target_request_copy_put(req);
2757                         RETURN(-ENOTCONN);
2758                 }
2759                 LASSERT(req->rq_export->exp_lock_replay_needed);
2760                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
2761                 spin_unlock(&obd->obd_recovery_task_lock);
2762                 RETURN(0);
2763         }
2764
2765         /* CAVEAT EMPTOR: The incoming request message has been swabbed
2766          * (i.e. buflens etc are in my own byte order), but type-dependent
2767          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed. */
2768
2769         if (!transno) {
2770                 INIT_LIST_HEAD(&req->rq_list);
2771                 DEBUG_REQ(D_HA, req, "not queueing");
2772                 RETURN(1);
2773         }
2774
2775         /* If we're processing the queue, we want don't want to queue this
2776          * message.
2777          *
2778          * Also, if this request has a transno less than the one we're waiting
2779          * for, we should process it now.  It could (and currently always will)
2780          * be an open request for a descriptor that was opened some time ago.
2781          *
2782          * Also, a resent, replayed request that has already been
2783          * handled will pass through here and be processed immediately.
2784          */
2785         CDEBUG(D_HA, "Next recovery transno: %llu"
2786                ", current: %llu, replaying\n",
2787                obd->obd_next_recovery_transno, transno);
2788
2789         /* If the request has been replayed by update replay, then sends this
2790          * request to the recovery thread (replay_request_or_update()), where
2791          * it will be handled */
2792         spin_lock(&obd->obd_recovery_task_lock);
2793         if (transno < obd->obd_next_recovery_transno &&
2794             !is_req_replayed_by_update(req)) {
2795                 /* Processing the queue right now, don't re-add. */
2796                 LASSERT(list_empty(&req->rq_list));
2797                 spin_unlock(&obd->obd_recovery_task_lock);
2798                 RETURN(1);
2799         }
2800         spin_unlock(&obd->obd_recovery_task_lock);
2801
2802         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2803                 RETURN(0);
2804
2805         target_request_copy_get(req);
2806         if (!req->rq_export->exp_in_recovery) {
2807                 target_request_copy_put(req);
2808                 RETURN(-ENOTCONN);
2809         }
2810         LASSERT(req->rq_export->exp_req_replay_needed);
2811
2812         if (target_exp_enqueue_req_replay(req)) {
2813                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2814                 target_request_copy_put(req);
2815                 RETURN(0);
2816         }
2817
2818         /* XXX O(n^2) */
2819         spin_lock(&obd->obd_recovery_task_lock);
2820         LASSERT(obd->obd_recovering);
2821         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
2822                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2823                         list_add_tail(&req->rq_list, &reqiter->rq_list);
2824                         inserted = 1;
2825                         goto added;
2826                 }
2827
2828                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2829                              transno)) {
2830                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2831                                   "has been claimed by another client");
2832                         spin_unlock(&obd->obd_recovery_task_lock);
2833                         target_exp_dequeue_req_replay(req);
2834                         target_request_copy_put(req);
2835                         RETURN(0);
2836                 }
2837         }
2838 added:
2839         if (!inserted)
2840                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2841
2842         obd->obd_requests_queued_for_recovery++;
2843         spin_unlock(&obd->obd_recovery_task_lock);
2844         wake_up(&obd->obd_next_transno_waitq);
2845         RETURN(0);
2846 }
2847
2848 int target_handle_ping(struct ptlrpc_request *req)
2849 {
2850         obd_ping(req->rq_svc_thread->t_env, req->rq_export);
2851         return req_capsule_server_pack(&req->rq_pill);
2852 }
2853
2854 void target_committed_to_req(struct ptlrpc_request *req)
2855 {
2856         struct obd_export *exp = req->rq_export;
2857
2858         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2859                 lustre_msg_set_last_committed(req->rq_repmsg,
2860                                               exp->exp_last_committed);
2861         else
2862                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2863                           "%d)", exp->exp_obd->obd_no_transno,
2864                           req->rq_repmsg == NULL);
2865
2866         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
2867                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2868 }
2869
2870 #endif /* HAVE_SERVER_SUPPORT */
2871
2872 /**
2873  * Packs current SLV and Limit into \a req.
2874  */
2875 int target_pack_pool_reply(struct ptlrpc_request *req)
2876 {
2877         struct obd_device *obd;
2878         ENTRY;
2879
2880         /* Check that we still have all structures alive as this may
2881          * be some late RPC at shutdown time. */
2882         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2883                      !exp_connect_lru_resize(req->rq_export))) {
2884                 lustre_msg_set_slv(req->rq_repmsg, 0);
2885                 lustre_msg_set_limit(req->rq_repmsg, 0);
2886                 RETURN(0);
2887         }
2888
2889         /* OBD is alive here as export is alive, which we checked above. */
2890         obd = req->rq_export->exp_obd;
2891
2892         read_lock(&obd->obd_pool_lock);
2893         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2894         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2895         read_unlock(&obd->obd_pool_lock);
2896
2897         RETURN(0);
2898 }
2899
2900 static int target_send_reply_msg(struct ptlrpc_request *req,
2901                                  int rc, int fail_id)
2902 {
2903         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2904                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2905                 return -ECOMM;
2906         }
2907         /* We can have a null rq_reqmsg in the event of bad signature or
2908          * no context when unwrapping */
2909         if (req->rq_reqmsg &&
2910             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
2911             OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
2912                 return -ECOMM;
2913
2914         if (unlikely(rc)) {
2915                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
2916                 req->rq_status = rc;
2917                 return ptlrpc_send_error(req, 1);
2918         } else {
2919                 DEBUG_REQ(D_NET, req, "sending reply");
2920         }
2921
2922         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
2923 }
2924
2925 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2926 {
2927         struct ptlrpc_service_part *svcpt;
2928         int                        netrc;
2929         struct ptlrpc_reply_state *rs;
2930         struct obd_export         *exp;
2931         ENTRY;
2932
2933         if (req->rq_no_reply) {
2934                 EXIT;
2935                 return;
2936         }
2937
2938         svcpt = req->rq_rqbd->rqbd_svcpt;
2939         rs = req->rq_reply_state;
2940         if (rs == NULL || !rs->rs_difficult) {
2941                 /* no notifiers */
2942                 target_send_reply_msg (req, rc, fail_id);
2943                 EXIT;
2944                 return;
2945         }
2946
2947         /* must be an export if locks saved */
2948         LASSERT(req->rq_export != NULL);
2949         /* req/reply consistent */
2950         LASSERT(rs->rs_svcpt == svcpt);
2951
2952         /* "fresh" reply */
2953         LASSERT(!rs->rs_scheduled);
2954         LASSERT(!rs->rs_scheduled_ever);
2955         LASSERT(!rs->rs_handled);
2956         LASSERT(!rs->rs_on_net);
2957         LASSERT(rs->rs_export == NULL);
2958         LASSERT(list_empty(&rs->rs_obd_list));
2959         LASSERT(list_empty(&rs->rs_exp_list));
2960
2961         exp = class_export_get(req->rq_export);
2962
2963         /* disable reply scheduling while I'm setting up */
2964         rs->rs_scheduled = 1;
2965         rs->rs_on_net    = 1;
2966         rs->rs_xid       = req->rq_xid;
2967         rs->rs_transno   = req->rq_transno;
2968         rs->rs_export    = exp;
2969         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
2970
2971         spin_lock(&exp->exp_uncommitted_replies_lock);
2972         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
2973                rs->rs_transno, exp->exp_last_committed);
2974         if (rs->rs_transno > exp->exp_last_committed) {
2975                 /* not committed already */
2976                 list_add_tail(&rs->rs_obd_list,
2977                                   &exp->exp_uncommitted_replies);
2978         }
2979         spin_unlock(&exp->exp_uncommitted_replies_lock);
2980
2981         spin_lock(&exp->exp_lock);
2982         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
2983         spin_unlock(&exp->exp_lock);
2984
2985         netrc = target_send_reply_msg(req, rc, fail_id);
2986
2987         spin_lock(&svcpt->scp_rep_lock);
2988
2989         atomic_inc(&svcpt->scp_nreps_difficult);
2990
2991         if (netrc != 0) {
2992                 /* error sending: reply is off the net.  Also we need +1
2993                  * reply ref until ptlrpc_handle_rs() is done
2994                  * with the reply state (if the send was successful, there
2995                  * would have been +1 ref for the net, which
2996                  * reply_out_callback leaves alone) */
2997                 rs->rs_on_net = 0;
2998                 ptlrpc_rs_addref(rs);
2999         }
3000
3001         spin_lock(&rs->rs_lock);
3002         if (rs->rs_transno <= exp->exp_last_committed ||
3003             (!rs->rs_on_net && !rs->rs_no_ack) ||
3004             list_empty(&rs->rs_exp_list) ||     /* completed already */
3005             list_empty(&rs->rs_obd_list)) {
3006                 CDEBUG(D_HA, "Schedule reply immediately\n");
3007                 ptlrpc_dispatch_difficult_reply(rs);
3008         } else {
3009                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
3010                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
3011         }
3012         spin_unlock(&rs->rs_lock);
3013         spin_unlock(&svcpt->scp_rep_lock);
3014         EXIT;
3015 }
3016
3017 enum ldlm_mode lck_compat_array[] = {
3018         [LCK_EX]    = LCK_COMPAT_EX,
3019         [LCK_PW]    = LCK_COMPAT_PW,
3020         [LCK_PR]    = LCK_COMPAT_PR,
3021         [LCK_CW]    = LCK_COMPAT_CW,
3022         [LCK_CR]    = LCK_COMPAT_CR,
3023         [LCK_NL]    = LCK_COMPAT_NL,
3024         [LCK_GROUP] = LCK_COMPAT_GROUP,
3025         [LCK_COS]   = LCK_COMPAT_COS,
3026 };
3027
3028 /**
3029  * Rather arbitrary mapping from LDLM error codes to errno values. This should
3030  * not escape to the user level.
3031  */
3032 int ldlm_error2errno(enum ldlm_error error)
3033 {
3034         int result;
3035
3036         switch (error) {
3037         case ELDLM_OK:
3038         case ELDLM_LOCK_MATCHED:
3039                 result = 0;
3040                 break;
3041         case ELDLM_LOCK_CHANGED:
3042                 result = -ESTALE;
3043                 break;
3044         case ELDLM_LOCK_ABORTED:
3045                 result = -ENAVAIL;
3046                 break;
3047         case ELDLM_LOCK_REPLACED:
3048                 result = -ESRCH;
3049                 break;
3050         case ELDLM_NO_LOCK_DATA:
3051                 result = -ENOENT;
3052                 break;
3053         case ELDLM_NAMESPACE_EXISTS:
3054                 result = -EEXIST;
3055                 break;
3056         case ELDLM_BAD_NAMESPACE:
3057                 result = -EBADF;
3058                 break;
3059         default:
3060                 if (((int)error) < 0) { /* cast to signed type */
3061                         result = error; /* as ldlm_error can be unsigned */
3062                 } else {
3063                         CERROR("Invalid DLM result code: %d\n", error);
3064                         result = -EPROTO;
3065                 }
3066         }
3067         return result;
3068 }
3069 EXPORT_SYMBOL(ldlm_error2errno);
3070
3071 /**
3072  * Dual to ldlm_error2errno(): maps errno values back to enum ldlm_error.
3073  */
3074 enum ldlm_error ldlm_errno2error(int err_no)
3075 {
3076         int error;
3077
3078         switch (err_no) {
3079         case 0:
3080                 error = ELDLM_OK;
3081                 break;
3082         case -ESTALE:
3083                 error = ELDLM_LOCK_CHANGED;
3084                 break;
3085         case -ENAVAIL:
3086                 error = ELDLM_LOCK_ABORTED;
3087                 break;
3088         case -ESRCH:
3089                 error = ELDLM_LOCK_REPLACED;
3090                 break;
3091         case -ENOENT:
3092                 error = ELDLM_NO_LOCK_DATA;
3093                 break;
3094         case -EEXIST:
3095                 error = ELDLM_NAMESPACE_EXISTS;
3096                 break;
3097         case -EBADF:
3098                 error = ELDLM_BAD_NAMESPACE;
3099                 break;
3100         default:
3101                 error = err_no;
3102         }
3103         return error;
3104 }
3105
3106 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3107 void ldlm_dump_export_locks(struct obd_export *exp)
3108 {
3109         spin_lock(&exp->exp_locks_list_guard);
3110         if (!list_empty(&exp->exp_locks_list)) {
3111                 struct ldlm_lock *lock;
3112
3113                 CERROR("dumping locks for export %p,"
3114                        "ignore if the unmount doesn't hang\n", exp);
3115                 list_for_each_entry(lock, &exp->exp_locks_list,
3116                                         l_exp_refs_link)
3117                         LDLM_ERROR(lock, "lock:");
3118         }
3119         spin_unlock(&exp->exp_locks_list_guard);
3120 }
3121 #endif
3122
3123 #ifdef HAVE_SERVER_SUPPORT
3124 static int target_bulk_timeout(void *data)
3125 {
3126         ENTRY;
3127         /* We don't fail the connection here, because having the export
3128          * killed makes the (vital) call to commitrw very sad.
3129          */
3130         RETURN(1);
3131 }
3132
3133 static inline const char *bulk2type(struct ptlrpc_request *req)
3134 {
3135         if (req->rq_bulk_read)
3136                 return "READ";
3137         if (req->rq_bulk_write)
3138                 return "WRITE";
3139         return "UNKNOWN";
3140 }
3141
3142 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc,
3143                    struct l_wait_info *lwi)
3144 {
3145         struct ptlrpc_request   *req = desc->bd_req;
3146         time_t                   start = cfs_time_current_sec();
3147         time_t                   deadline;
3148         int                      rc = 0;
3149
3150         ENTRY;
3151
3152         /* If there is eviction in progress, wait for it to finish. */
3153         if (unlikely(atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
3154                 *lwi = LWI_INTR(NULL, NULL);
3155                 rc = l_wait_event(exp->exp_obd->obd_evict_inprogress_waitq,
3156                                   !atomic_read(&exp->exp_obd->
3157                                                    obd_evict_inprogress),
3158                                   lwi);
3159         }
3160
3161         /* Check if client was evicted or reconnected already. */
3162         if (exp->exp_failed ||
3163             exp->exp_conn_cnt > lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3164                 rc = -ENOTCONN;
3165         } else {
3166                 if (req->rq_bulk_read)
3167                         rc = sptlrpc_svc_wrap_bulk(req, desc);
3168
3169                 if (OCD_HAS_FLAG(&exp->exp_connect_data, BULK_MBITS))
3170                         req->rq_mbits = lustre_msg_get_mbits(req->rq_reqmsg);
3171                 else /* old version, bulk matchbits is rq_xid */
3172                         req->rq_mbits = req->rq_xid;
3173
3174                 if (rc == 0)
3175                         rc = ptlrpc_start_bulk_transfer(desc);
3176         }
3177
3178         if (rc < 0) {
3179                 DEBUG_REQ(D_ERROR, req, "bulk %s failed: rc %d",
3180                           bulk2type(req), rc);
3181                 RETURN(rc);
3182         }
3183
3184         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
3185                 ptlrpc_abort_bulk(desc);
3186                 RETURN(0);
3187         }
3188
3189         /* limit actual bulk transfer to bulk_timeout seconds */
3190         deadline = start + bulk_timeout;
3191         if (deadline > req->rq_deadline)
3192                 deadline = req->rq_deadline;
3193
3194         do {
3195                 long timeoutl = deadline - cfs_time_current_sec();
3196                 cfs_duration_t timeout = timeoutl <= 0 ?
3197                                          CFS_TICK : cfs_time_seconds(timeoutl);
3198                 time_t  rq_deadline;
3199
3200                 *lwi = LWI_TIMEOUT_INTERVAL(timeout, cfs_time_seconds(1),
3201                                             target_bulk_timeout, desc);
3202                 rc = l_wait_event(desc->bd_waitq,
3203                                   !ptlrpc_server_bulk_active(desc) ||
3204                                   exp->exp_failed ||
3205                                   exp->exp_conn_cnt >
3206                                   lustre_msg_get_conn_cnt(req->rq_reqmsg),
3207                                   lwi);
3208                 LASSERT(rc == 0 || rc == -ETIMEDOUT);
3209                 /* Wait again if we changed rq_deadline. */
3210                 rq_deadline = ACCESS_ONCE(req->rq_deadline);
3211                 deadline = start + bulk_timeout;
3212                 if (deadline > rq_deadline)
3213                         deadline = rq_deadline;
3214         } while ((rc == -ETIMEDOUT) &&
3215                  (deadline > cfs_time_current_sec()));
3216
3217         if (rc == -ETIMEDOUT) {
3218                 DEBUG_REQ(D_ERROR, req, "timeout on bulk %s after %ld%+lds",
3219                           bulk2type(req), deadline - start,
3220                           cfs_time_current_sec() - deadline);
3221                 ptlrpc_abort_bulk(desc);
3222         } else if (exp->exp_failed) {
3223                 DEBUG_REQ(D_ERROR, req, "Eviction on bulk %s",
3224                           bulk2type(req));
3225                 rc = -ENOTCONN;
3226                 ptlrpc_abort_bulk(desc);
3227         } else if (exp->exp_conn_cnt >
3228                    lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3229                 DEBUG_REQ(D_ERROR, req, "Reconnect on bulk %s",
3230                           bulk2type(req));
3231                 /* We don't reply anyway. */
3232                 rc = -ETIMEDOUT;
3233                 ptlrpc_abort_bulk(desc);
3234         } else if (desc->bd_failure) {
3235                 DEBUG_REQ(D_ERROR, req, "network error on bulk %s",
3236                           bulk2type(req));
3237                 /* XXX should this be a different errno? */
3238                 rc = -ETIMEDOUT;
3239         } else {
3240                 if (req->rq_bulk_write)
3241                         rc = sptlrpc_svc_unwrap_bulk(req, desc);
3242                 if (rc == 0 && desc->bd_nob_transferred != desc->bd_nob) {
3243                         DEBUG_REQ(D_ERROR, req, "truncated bulk %s %d(%d)",
3244                                   bulk2type(req), desc->bd_nob_transferred,
3245                                   desc->bd_nob);
3246                         /* XXX should this be a different errno? */
3247                         rc = -ETIMEDOUT;
3248                 }
3249         }
3250
3251         RETURN(rc);
3252 }
3253 EXPORT_SYMBOL(target_bulk_io);
3254
3255 #endif /* HAVE_SERVER_SUPPORT */