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, 2017, 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 <cl_object.h>
  43 #include <linux/jiffies.h>
  44 #include <linux/kernel.h>
  45 #include <linux/kthread.h>
  46 #include <libcfs/libcfs.h>
  47 #include <obd.h>
  48 #include <obd_class.h>
  49 #include <lustre_dlm.h>
  50 #include <lustre_net.h>
  51 #include <lustre_sec.h>
  52 #include "ldlm_internal.h"
  53
  54 /*
  55  * @priority: If non-zero, move the selected connection to the list head.
  56  * @create: If zero, only search in existing connections.
  57  */
  58 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  59                            int priority, int create)
  60 {
  61         struct ptlrpc_connection *ptlrpc_conn;
  62         struct obd_import_conn *imp_conn = NULL, *item;
  63         lnet_nid_t nid4refnet = LNET_NID_ANY;
  64         int rc = 0;
  65
  66         ENTRY;
  67
  68         if (!create && !priority) {
  69                 CDEBUG(D_HA, "Nothing to do\n");
  70                 RETURN(-EINVAL);
  71         }
  72
  73         if (imp->imp_connection &&
  74             imp->imp_connection->c_remote_uuid.uuid[0] == 0)
  75                 /* nid4refnet is used to restrict network connections */
  76                 nid4refnet = imp->imp_connection->c_self;
  77         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, nid4refnet);
  78         if (!ptlrpc_conn) {
  79                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  80                 RETURN(-ENOENT);
  81         }
  82
  83         if (create) {
  84                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  85                 if (!imp_conn)
  86                         GOTO(out_put, rc = -ENOMEM);
  87         }
  88
  89         spin_lock(&imp->imp_lock);
  90         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  91                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  92                         if (priority) {
  93                                 list_del(&item->oic_item);
  94                                 list_add(&item->oic_item,
  95                                          &imp->imp_conn_list);
  96                                 item->oic_last_attempt = 0;
  97                         }
  98                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  99                                imp, imp->imp_obd->obd_name, uuid->uuid,
 100                                (priority ? ", moved to head" : ""));
 101                         spin_unlock(&imp->imp_lock);
 102                         GOTO(out_free, rc = 0);
 103                 }
 104         }
 105         /* No existing import connection found for \a uuid. */
 106         if (create) {
 107                 imp_conn->oic_conn = ptlrpc_conn;
 108                 imp_conn->oic_uuid = *uuid;
 109                 imp_conn->oic_last_attempt = 0;
 110                 if (priority)
 111                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 112                 else
 113                         list_add_tail(&imp_conn->oic_item,
 114                                       &imp->imp_conn_list);
 115                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 116                        imp, imp->imp_obd->obd_name, uuid->uuid,
 117                        (priority ? "head" : "tail"));
 118         } else {
 119                 spin_unlock(&imp->imp_lock);
 120                 GOTO(out_free, rc = -ENOENT);
 121         }
 122
 123         spin_unlock(&imp->imp_lock);
 124         RETURN(0);
 125 out_free:
 126         if (imp_conn)
 127                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 128 out_put:
 129         ptlrpc_connection_put(ptlrpc_conn);
 130         RETURN(rc);
 131 }
 132
 133 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 134 {
 135         return import_set_conn(imp, uuid, 1, 0);
 136 }
 137
 138 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 139                            int priority)
 140 {
 141         return import_set_conn(imp, uuid, priority, 1);
 142 }
 143 EXPORT_SYMBOL(client_import_add_conn);
 144
 145 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 146 {
 147         struct obd_import_conn *imp_conn;
 148         struct obd_export *dlmexp;
 149         int rc = -ENOENT;
 150
 151         ENTRY;
 152
 153         spin_lock(&imp->imp_lock);
 154         if (list_empty(&imp->imp_conn_list)) {
 155                 LASSERT(!imp->imp_connection);
 156                 GOTO(out, rc);
 157         }
 158
 159         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 160                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 161                         continue;
 162                 LASSERT(imp_conn->oic_conn);
 163
 164                 if (imp_conn == imp->imp_conn_current) {
 165                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 166
 167                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 168                             imp->imp_state != LUSTRE_IMP_DISCON) {
 169                                 CERROR("can't remove current connection\n");
 170                                 GOTO(out, rc = -EBUSY);
 171                         }
 172
 173                         ptlrpc_connection_put(imp->imp_connection);
 174                         imp->imp_connection = NULL;
 175
 176                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 177                         if (dlmexp && dlmexp->exp_connection) {
 178                                 LASSERT(dlmexp->exp_connection ==
 179                                         imp_conn->oic_conn);
 180                                 ptlrpc_connection_put(dlmexp->exp_connection);
 181                                 dlmexp->exp_connection = NULL;
 182                         }
 183
 184                         if (dlmexp != NULL)
 185                                 class_export_put(dlmexp);
 186                 }
 187
 188                 list_del(&imp_conn->oic_item);
 189                 ptlrpc_connection_put(imp_conn->oic_conn);
 190                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 191                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 192                        imp, imp->imp_obd->obd_name, uuid->uuid);
 193                 rc = 0;
 194                 break;
 195         }
 196 out:
 197         spin_unlock(&imp->imp_lock);
 198         if (rc == -ENOENT)
 199                 CERROR("connection %s not found\n", uuid->uuid);
 200         RETURN(rc);
 201 }
 202 EXPORT_SYMBOL(client_import_del_conn);
 203
 204 /**
 205  * Find conn UUID by peer NID. \a peer is a server NID. This function is used
 206  * to find a conn uuid of \a imp which can reach \a peer.
 207  */
 208 int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
 209                             struct obd_uuid *uuid)
 210 {
 211         struct obd_import_conn *conn;
 212         int rc = -ENOENT;
 213
 214         ENTRY;
 215
 216         spin_lock(&imp->imp_lock);
 217         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 218                 /* Check if conn UUID does have this peer NID. */
 219                 if (class_check_uuid(&conn->oic_uuid, peer)) {
 220                         *uuid = conn->oic_uuid;
 221                         rc = 0;
 222                         break;
 223                 }
 224         }
 225         spin_unlock(&imp->imp_lock);
 226         RETURN(rc);
 227 }
 228 EXPORT_SYMBOL(client_import_find_conn);
 229
 230 void client_destroy_import(struct obd_import *imp)
 231 {
 232         /*
 233          * Drop security policy instance after all RPCs have finished/aborted
 234          * to let all busy contexts be released.
 235          */
 236         class_import_get(imp);
 237         class_destroy_import(imp);
 238         sptlrpc_import_sec_put(imp);
 239         class_import_put(imp);
 240 }
 241 EXPORT_SYMBOL(client_destroy_import);
 242
 243 /**
 244  * Check whether or not the OSC is on MDT.
 245  * In the config log,
 246  * osc on MDT
 247  *      setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
 248  * osc on client
 249  *      setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
 250  *
 251  **/
 252 static int osc_on_mdt(char *obdname)
 253 {
 254         char *ptr;
 255
 256         ptr = strrchr(obdname, '-');
 257         if (ptr == NULL)
 258                 return 0;
 259
 260         if (strncmp(ptr + 1, "MDT", 3) == 0)
 261                 return 1;
 262
 263         return 0;
 264 }
 265
 266 /*
 267  * Configure an RPC client OBD device.
 268  *
 269  * lcfg parameters:
 270  * 1 - client UUID
 271  * 2 - server UUID
 272  * 3 - inactive-on-startup
 273  * 4 - restrictive net
 274  */
 275 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 276 {
 277         struct client_obd *cli = &obddev->u.cli;
 278         struct obd_import *imp;
 279         struct obd_uuid server_uuid;
 280         int rq_portal, rp_portal, connect_op;
 281         char *name = obddev->obd_type->typ_name;
 282         enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
 283         char *cli_name = lustre_cfg_buf(lcfg, 0);
 284         struct ptlrpc_connection fake_conn = { .c_self = 0,
 285                                                .c_remote_uuid.uuid[0] = 0 };
 286         int rc;
 287
 288         ENTRY;
 289
 290         /*
 291          * In a more perfect world, we would hang a ptlrpc_client off of
 292          * obd_type and just use the values from there.
 293          */
 294         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 295                 rq_portal = OST_REQUEST_PORTAL;
 296                 rp_portal = OSC_REPLY_PORTAL;
 297                 connect_op = OST_CONNECT;
 298                 cli->cl_sp_me = LUSTRE_SP_CLI;
 299                 cli->cl_sp_to = LUSTRE_SP_OST;
 300                 ns_type = LDLM_NS_TYPE_OSC;
 301         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
 302                    !strcmp(name, LUSTRE_LWP_NAME)) {
 303                 rq_portal = MDS_REQUEST_PORTAL;
 304                 rp_portal = MDC_REPLY_PORTAL;
 305                 connect_op = MDS_CONNECT;
 306                 if (is_lwp_on_ost(cli_name))
 307                         cli->cl_sp_me = LUSTRE_SP_OST;
 308                 else if (is_lwp_on_mdt(cli_name))
 309                         cli->cl_sp_me = LUSTRE_SP_MDT;
 310                 else
 311                         cli->cl_sp_me = LUSTRE_SP_CLI;
 312                 cli->cl_sp_to = LUSTRE_SP_MDT;
 313                 ns_type = LDLM_NS_TYPE_MDC;
 314         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
 315                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
 316                         /* OSP_on_MDT for other MDTs */
 317                         connect_op = MDS_CONNECT;
 318                         cli->cl_sp_to = LUSTRE_SP_MDT;
 319                         ns_type = LDLM_NS_TYPE_MDC;
 320                         rq_portal = OUT_PORTAL;
 321                 } else {
 322                         /* OSP on MDT for OST */
 323                         connect_op = OST_CONNECT;
 324                         cli->cl_sp_to = LUSTRE_SP_OST;
 325                         ns_type = LDLM_NS_TYPE_OSC;
 326                         rq_portal = OST_REQUEST_PORTAL;
 327                 }
 328                 rp_portal = OSC_REPLY_PORTAL;
 329                 cli->cl_sp_me = LUSTRE_SP_MDT;
 330         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 331                 rq_portal = MGS_REQUEST_PORTAL;
 332                 rp_portal = MGC_REPLY_PORTAL;
 333                 connect_op = MGS_CONNECT;
 334                 cli->cl_sp_me = LUSTRE_SP_MGC;
 335                 cli->cl_sp_to = LUSTRE_SP_MGS;
 336                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 337                 ns_type = LDLM_NS_TYPE_MGC;
 338         } else {
 339                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 340                        name);
 341                 RETURN(-EINVAL);
 342         }
 343
 344         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 345                 CERROR("requires a TARGET UUID\n");
 346                 RETURN(-EINVAL);
 347         }
 348
 349         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 350                 CERROR("client UUID must be less than 38 characters\n");
 351                 RETURN(-EINVAL);
 352         }
 353
 354         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 355                 CERROR("setup requires a SERVER UUID\n");
 356                 RETURN(-EINVAL);
 357         }
 358
 359         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 360                 CERROR("target UUID must be less than 38 characters\n");
 361                 RETURN(-EINVAL);
 362         }
 363
 364         init_rwsem(&cli->cl_sem);
 365         mutex_init(&cli->cl_mgc_mutex);
 366         cli->cl_seq = NULL;
 367         init_rwsem(&cli->cl_seq_rwsem);
 368         cli->cl_conn_count = 0;
 369         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 370                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 371                      sizeof(server_uuid)));
 372
 373         cli->cl_dirty_pages = 0;
 374         cli->cl_dirty_max_pages = 0;
 375         cli->cl_avail_grant = 0;
 376         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
 377         /*
 378          * cl_dirty_max_pages may be changed at connect time in
 379          * ptlrpc_connect_interpret().
 380          */
 381         client_adjust_max_dirty(cli);
 382         INIT_LIST_HEAD(&cli->cl_cache_waiters);
 383         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 384         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 385         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 386         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 387         spin_lock_init(&cli->cl_loi_list_lock);
 388         atomic_set(&cli->cl_pending_w_pages, 0);
 389         atomic_set(&cli->cl_pending_r_pages, 0);
 390         cli->cl_r_in_flight = 0;
 391         cli->cl_w_in_flight = 0;
 392
 393         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 394         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 395         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 396         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 397         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 398         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 399
 400         /* lru for osc. */
 401         INIT_LIST_HEAD(&cli->cl_lru_osc);
 402         atomic_set(&cli->cl_lru_shrinkers, 0);
 403         atomic_long_set(&cli->cl_lru_busy, 0);
 404         atomic_long_set(&cli->cl_lru_in_list, 0);
 405         INIT_LIST_HEAD(&cli->cl_lru_list);
 406         spin_lock_init(&cli->cl_lru_list_lock);
 407         atomic_long_set(&cli->cl_unstable_count, 0);
 408         INIT_LIST_HEAD(&cli->cl_shrink_list);
 409         INIT_LIST_HEAD(&cli->cl_grant_chain);
 410
 411         INIT_LIST_HEAD(&cli->cl_flight_waiters);
 412         cli->cl_rpcs_in_flight = 0;
 413
 414         init_waitqueue_head(&cli->cl_destroy_waitq);
 415         atomic_set(&cli->cl_destroy_in_flight, 0);
 416
 417         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 418 #ifdef ENABLE_CHECKSUM
 419         /* Turn on checksumming by default. */
 420         cli->cl_checksum = 1;
 421         /*
 422          * The supported checksum types will be worked out at connect time
 423          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 424          * through procfs.
 425          */
 426         cli->cl_cksum_type = cli->cl_supp_cksum_types;
 427 #endif
 428         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 429
 430         /*
 431          * Set it to possible maximum size. It may be reduced by ocd_brw_size
 432          * from OFD after connecting.
 433          */
 434         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 435
 436         cli->cl_max_short_io_bytes = OBD_MAX_SHORT_IO_BYTES;
 437
 438         /*
 439          * set cl_chunkbits default value to PAGE_SHIFT,
 440          * it will be updated at OSC connection time.
 441          */
 442         cli->cl_chunkbits = PAGE_SHIFT;
 443
 444         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 445                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 446         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
 447                 cli->cl_max_rpcs_in_flight = 2;
 448         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
 449                 cli->cl_max_rpcs_in_flight = 3;
 450         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
 451                 cli->cl_max_rpcs_in_flight = 4;
 452         } else {
 453                 if (osc_on_mdt(obddev->obd_name))
 454                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
 455                 else
 456                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 457         }
 458
 459         spin_lock_init(&cli->cl_mod_rpcs_lock);
 460         spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
 461         cli->cl_max_mod_rpcs_in_flight = 0;
 462         cli->cl_mod_rpcs_in_flight = 0;
 463         cli->cl_close_rpcs_in_flight = 0;
 464         init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
 465         cli->cl_mod_tag_bitmap = NULL;
 466
 467         INIT_LIST_HEAD(&cli->cl_chg_dev_linkage);
 468
 469         if (connect_op == MDS_CONNECT) {
 470                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
 471                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
 472                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 473                 if (cli->cl_mod_tag_bitmap == NULL)
 474                         GOTO(err, rc = -ENOMEM);
 475         }
 476
 477         rc = ldlm_get_ref();
 478         if (rc) {
 479                 CERROR("ldlm_get_ref failed: %d\n", rc);
 480                 GOTO(err, rc);
 481         }
 482
 483         ptlrpc_init_client(rq_portal, rp_portal, name,
 484                            &obddev->obd_ldlm_client);
 485
 486         imp = class_new_import(obddev);
 487         if (imp == NULL)
 488                 GOTO(err_ldlm, rc = -ENOENT);
 489         imp->imp_client = &obddev->obd_ldlm_client;
 490         imp->imp_connect_op = connect_op;
 491         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 492                LUSTRE_CFG_BUFLEN(lcfg, 1));
 493         class_import_put(imp);
 494
 495         if (lustre_cfg_buf(lcfg, 4)) {
 496                 __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
 497
 498                 if (refnet == LNET_NIDNET(LNET_NID_ANY)) {
 499                         rc = -EINVAL;
 500                         CERROR("%s: bad mount option 'network=%s': rc = %d\n",
 501                                obddev->obd_name, lustre_cfg_string(lcfg, 4),
 502                                rc);
 503                         GOTO(err_import, rc);
 504                 }
 505                 fake_conn.c_self = LNET_MKNID(refnet, 0);
 506                 imp->imp_connection = &fake_conn;
 507         }
 508
 509         rc = client_import_add_conn(imp, &server_uuid, 1);
 510         if (rc) {
 511                 CERROR("can't add initial connection\n");
 512                 GOTO(err_import, rc);
 513         }
 514         imp->imp_connection = NULL;
 515
 516         cli->cl_import = imp;
 517         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
 518         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 519
 520         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 521                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 522                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 523                                name, obddev->obd_name,
 524                                cli->cl_target_uuid.uuid);
 525                         spin_lock(&imp->imp_lock);
 526                         imp->imp_deactive = 1;
 527                         spin_unlock(&imp->imp_lock);
 528                 }
 529         }
 530
 531         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 532                                                    LDLM_NAMESPACE_CLIENT,
 533                                                    LDLM_NAMESPACE_GREEDY,
 534                                                    ns_type);
 535         if (obddev->obd_namespace == NULL) {
 536                 CERROR("Unable to create client namespace - %s\n",
 537                        obddev->obd_name);
 538                 GOTO(err_import, rc = -ENOMEM);
 539         }
 540
 541         RETURN(rc);
 542
 543 err_import:
 544         class_destroy_import(imp);
 545 err_ldlm:
 546         ldlm_put_ref();
 547 err:
 548         if (cli->cl_mod_tag_bitmap != NULL)
 549                 OBD_FREE(cli->cl_mod_tag_bitmap,
 550                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 551         cli->cl_mod_tag_bitmap = NULL;
 552         RETURN(rc);
 553
 554 }
 555 EXPORT_SYMBOL(client_obd_setup);
 556
 557 int client_obd_cleanup(struct obd_device *obddev)
 558 {
 559         struct client_obd *cli = &obddev->u.cli;
 560
 561         ENTRY;
 562
 563         ldlm_namespace_free_post(obddev->obd_namespace);
 564         obddev->obd_namespace = NULL;
 565
 566         obd_cleanup_client_import(obddev);
 567         LASSERT(obddev->u.cli.cl_import == NULL);
 568
 569         ldlm_put_ref();
 570
 571         if (cli->cl_mod_tag_bitmap != NULL)
 572                 OBD_FREE(cli->cl_mod_tag_bitmap,
 573                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 574         cli->cl_mod_tag_bitmap = NULL;
 575
 576         RETURN(0);
 577 }
 578 EXPORT_SYMBOL(client_obd_cleanup);
 579
 580 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 581 int client_connect_import(const struct lu_env *env,
 582                           struct obd_export **exp,
 583                           struct obd_device *obd, struct obd_uuid *cluuid,
 584                           struct obd_connect_data *data, void *localdata)
 585 {
 586         struct client_obd *cli = &obd->u.cli;
 587         struct obd_import *imp = cli->cl_import;
 588         struct obd_connect_data *ocd;
 589         struct lustre_handle conn = { 0 };
 590         int rc;
 591
 592         ENTRY;
 593
 594         *exp = NULL;
 595         down_write(&cli->cl_sem);
 596         if (cli->cl_conn_count > 0)
 597                 GOTO(out_sem, rc = -EALREADY);
 598
 599         rc = class_connect(&conn, obd, cluuid);
 600         if (rc)
 601                 GOTO(out_sem, rc);
 602
 603         cli->cl_conn_count++;
 604         *exp = class_conn2export(&conn);
 605
 606         LASSERT(obd->obd_namespace);
 607
 608         imp->imp_dlm_handle = conn;
 609         rc = ptlrpc_init_import(imp);
 610         if (rc != 0)
 611                 GOTO(out_ldlm, rc);
 612
 613         ocd = &imp->imp_connect_data;
 614         if (data) {
 615                 *ocd = *data;
 616                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 617                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
 618         }
 619
 620         rc = ptlrpc_connect_import(imp);
 621         if (rc != 0) {
 622                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 623                 GOTO(out_ldlm, rc);
 624         }
 625         LASSERT(*exp != NULL && (*exp)->exp_connection);
 626
 627         if (data) {
 628                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 629                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 630                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 631                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 632                 data->ocd_connect_flags2 = ocd->ocd_connect_flags2;
 633         }
 634
 635         ptlrpc_pinger_add_import(imp);
 636
 637         EXIT;
 638
 639         if (rc) {
 640 out_ldlm:
 641                 cli->cl_conn_count--;
 642                 class_disconnect(*exp);
 643                 *exp = NULL;
 644         }
 645 out_sem:
 646         up_write(&cli->cl_sem);
 647
 648         if (!rc && localdata) {
 649                 LASSERT(cli->cl_cache == NULL); /* only once */
 650                 cli->cl_cache = (struct cl_client_cache *)localdata;
 651                 cl_cache_incref(cli->cl_cache);
 652                 cli->cl_lru_left = &cli->cl_cache->ccc_lru_left;
 653
 654                 /* add this osc into entity list */
 655                 LASSERT(list_empty(&cli->cl_lru_osc));
 656                 spin_lock(&cli->cl_cache->ccc_lru_lock);
 657                 list_add(&cli->cl_lru_osc, &cli->cl_cache->ccc_lru);
 658                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
 659         }
 660
 661         return rc;
 662 }
 663 EXPORT_SYMBOL(client_connect_import);
 664
 665 int client_disconnect_export(struct obd_export *exp)
 666 {
 667         struct obd_device *obd = class_exp2obd(exp);
 668         struct client_obd *cli;
 669         struct obd_import *imp;
 670         int rc = 0, err;
 671
 672         ENTRY;
 673
 674         if (!obd) {
 675                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 676                        exp, exp ? exp->exp_handle.h_cookie : -1);
 677                 RETURN(-EINVAL);
 678         }
 679
 680         cli = &obd->u.cli;
 681         imp = cli->cl_import;
 682
 683         down_write(&cli->cl_sem);
 684         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
 685                 cli->cl_conn_count);
 686
 687         if (cli->cl_conn_count == 0) {
 688                 CERROR("disconnecting disconnected device (%s)\n",
 689                        obd->obd_name);
 690                 GOTO(out_disconnect, rc = -EINVAL);
 691         }
 692
 693         cli->cl_conn_count--;
 694         if (cli->cl_conn_count != 0)
 695                 GOTO(out_disconnect, rc = 0);
 696
 697         /*
 698          * Mark import deactivated now, so we don't try to reconnect if any
 699          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 700          * fully deactivate the import, or that would drop all requests.
 701          */
 702         spin_lock(&imp->imp_lock);
 703         imp->imp_deactive = 1;
 704         spin_unlock(&imp->imp_lock);
 705
 706         /*
 707          * Some non-replayable imports (MDS's OSCs) are pinged, so just
 708          * delete it regardless.  (It's safe to delete an import that was
 709          * never added.)
 710          */
 711         (void)ptlrpc_pinger_del_import(imp);
 712
 713         if (obd->obd_namespace != NULL) {
 714                 /* obd_force == local only */
 715                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 716                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 717                 ldlm_namespace_free_prior(obd->obd_namespace, imp,
 718                                           obd->obd_force);
 719         }
 720
 721         /*
 722          * There's no need to hold sem while disconnecting an import,
 723          * and it may actually cause deadlock in GSS.
 724          */
 725         up_write(&cli->cl_sem);
 726         rc = ptlrpc_disconnect_import(imp, 0);
 727         down_write(&cli->cl_sem);
 728
 729         ptlrpc_invalidate_import(imp);
 730
 731         EXIT;
 732
 733 out_disconnect:
 734         /*
 735          * Use server style - class_disconnect should be always called for
 736          * o_disconnect.
 737          */
 738         err = class_disconnect(exp);
 739         if (!rc && err)
 740                 rc = err;
 741
 742         up_write(&cli->cl_sem);
 743
 744         RETURN(rc);
 745 }
 746 EXPORT_SYMBOL(client_disconnect_export);
 747
 748 #ifdef HAVE_SERVER_SUPPORT
 749 int server_disconnect_export(struct obd_export *exp)
 750 {
 751         int rc;
 752
 753         ENTRY;
 754
 755         /* Disconnect early so that clients can't keep using export. */
 756         rc = class_disconnect(exp);
 757         /* Close import to avoid sending any requests. */
 758         if (exp->exp_imp_reverse)
 759                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 760
 761         ldlm_bl_thread_wakeup();
 762
 763         /* complete all outstanding replies */
 764         spin_lock(&exp->exp_lock);
 765         while (!list_empty(&exp->exp_outstanding_replies)) {
 766                 struct ptlrpc_reply_state *rs =
 767                         list_entry(exp->exp_outstanding_replies.next,
 768                                        struct ptlrpc_reply_state, rs_exp_list);
 769                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 770
 771                 spin_lock(&svcpt->scp_rep_lock);
 772
 773                 list_del_init(&rs->rs_exp_list);
 774
 775                 spin_lock(&rs->rs_lock);
 776                 /* clear rs_convert_lock to make sure rs is handled and put */
 777                 rs->rs_convert_lock = 0;
 778                 ptlrpc_schedule_difficult_reply(rs);
 779                 spin_unlock(&rs->rs_lock);
 780
 781                 spin_unlock(&svcpt->scp_rep_lock);
 782         }
 783         spin_unlock(&exp->exp_lock);
 784
 785         RETURN(rc);
 786 }
 787 EXPORT_SYMBOL(server_disconnect_export);
 788
 789 /*
 790  * --------------------------------------------------------------------------
 791  * from old lib/target.c
 792  * --------------------------------------------------------------------------
 793  */
 794
 795 static int target_handle_reconnect(struct lustre_handle *conn,
 796                                    struct obd_export *exp,
 797                                    struct obd_uuid *cluuid)
 798 {
 799         struct obd_device *target;
 800         struct lustre_handle *hdl;
 801         ktime_t remaining;
 802         s64 timeout;
 803         int rc = 0;
 804
 805         ENTRY;
 806         hdl = &exp->exp_imp_reverse->imp_remote_handle;
 807         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
 808                 conn->cookie = exp->exp_handle.h_cookie;
 809                 CDEBUG(D_HA,
 810                        "connect export for UUID '%s' at %p, cookie %#llx\n",
 811                        cluuid->uuid, exp, conn->cookie);
 812                 RETURN(0);
 813         }
 814
 815         target = exp->exp_obd;
 816
 817         /* Might be a re-connect after a partition. */
 818         if (memcmp(&conn->cookie, &hdl->cookie, sizeof(conn->cookie))) {
 819                 LCONSOLE_WARN("%s: already connected client %s (at %s) with handle %#llx. Rejecting client with the same UUID trying to reconnect with handle %#llx\n",
 820                               target->obd_name,
 821                               obd_uuid2str(&exp->exp_client_uuid),
 822                               obd_export_nid2str(exp),
 823                               hdl->cookie, conn->cookie);
 824                 memset(conn, 0, sizeof(*conn));
 825                 /*
 826                  * target_handle_connect() treats EALREADY and
 827                  * -EALREADY differently.  -EALREADY is an error
 828                  * (same UUID, different handle).
 829                  */
 830                 RETURN(-EALREADY);
 831         }
 832
 833         if (!target->obd_recovering) {
 834                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
 835                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
 836                         obd_export_nid2str(exp));
 837                 GOTO(out_already, rc);
 838         }
 839
 840         remaining = hrtimer_expires_remaining(&target->obd_recovery_timer);
 841         timeout = ktime_divns(remaining, NSEC_PER_SEC);
 842         if (timeout > 0) {
 843                 LCONSOLE_WARN("%s: Client %s (at %s) reconnected, waiting for %d clients in recovery for %lld:%.02lld\n",
 844                               target->obd_name,
 845                               obd_uuid2str(&exp->exp_client_uuid),
 846                               obd_export_nid2str(exp),
 847                               target->obd_max_recoverable_clients,
 848                               timeout / 60, timeout % 60);
 849         } else {
 850                 struct target_distribute_txn_data *tdtd;
 851                 int size = 0;
 852                 int count = 0;
 853                 char *buf = NULL;
 854
 855                 tdtd = class_exp2tgt(exp)->lut_tdtd;
 856                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
 857                         buf = tdtd->tdtd_show_update_logs_retrievers(
 858                                 tdtd->tdtd_show_retrievers_cbdata,
 859                                 &size, &count);
 860
 861                 if (count > 0)
 862                         LCONSOLE_WARN("%s: Client %s (at %s) reconnecting, waiting for %d MDTs (%s) in recovery for %lld:%.02lld. Please wait until all MDTs recovered or you may force MDT evicition via 'lctl --device %s abort_recovery.\n",
 863                                       target->obd_name,
 864                                       obd_uuid2str(&exp->exp_client_uuid),
 865                                       obd_export_nid2str(exp), count,
 866                                       buf ? buf : "unknown (not enough RAM)",
 867                                       (abs(timeout) + target->obd_recovery_timeout) / 60,
 868                                       (abs(timeout) + target->obd_recovery_timeout) % 60,
 869                                       target->obd_name);
 870                 else
 871                         LCONSOLE_WARN("%s: Recovery already passed deadline %lld:%.02lld. If you do not want to wait more, you may force taget eviction via 'lctl --device %s abort_recovery.\n",
 872                                       target->obd_name, abs(timeout) / 60,
 873                                       abs(timeout) % 60, target->obd_name);
 874
 875                 if (buf != NULL)
 876                         OBD_FREE(buf, size);
 877         }
 878
 879 out_already:
 880         conn->cookie = exp->exp_handle.h_cookie;
 881         /*
 882          * target_handle_connect() treats EALREADY and
 883          * -EALREADY differently.  EALREADY means we are
 884          * doing a valid reconnect from the same client.
 885          */
 886         RETURN(EALREADY);
 887 }
 888
 889 static void
 890 check_and_start_recovery_timer(struct obd_device *obd,
 891                                struct ptlrpc_request *req, int new_client);
 892
 893 /**
 894  * update flags for import during reconnect process
 895  */
 896 static int rev_import_flags_update(struct obd_import *revimp,
 897                                    struct ptlrpc_request *req)
 898 {
 899         int rc;
 900         struct obd_connect_data *data;
 901
 902         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 903
 904         if (data->ocd_connect_flags & OBD_CONNECT_AT)
 905                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 906         else
 907                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 908
 909         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
 910
 911         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
 912         if (rc) {
 913                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
 914                         revimp->imp_client->cli_name,
 915                         libcfs_id2str(req->rq_peer), rc);
 916                 return rc;
 917         }
 918
 919         return 0;
 920 }
 921
 922 /**
 923  * Allocate a new reverse import for an export.
 924  *
 925  * \retval -errno in case error hit
 926  * \retval 0 if reverse import correctly init
 927  **/
 928 int rev_import_init(struct obd_export *export)
 929 {
 930         struct obd_device *obd = export->exp_obd;
 931         struct obd_import *revimp;
 932
 933         LASSERT(export->exp_imp_reverse == NULL);
 934
 935         revimp = class_new_import(obd);
 936         if (revimp == NULL)
 937                 return -ENOMEM;
 938
 939         revimp->imp_remote_handle.cookie = 0ULL;
 940         revimp->imp_client = &obd->obd_ldlm_client;
 941         revimp->imp_dlm_fake = 1;
 942
 943         /* it is safe to connect import in new state as no sends possible */
 944         spin_lock(&export->exp_lock);
 945         export->exp_imp_reverse = revimp;
 946         spin_unlock(&export->exp_lock);
 947         class_import_put(revimp);
 948
 949         return 0;
 950 }
 951 EXPORT_SYMBOL(rev_import_init);
 952
 953 /**
 954  * Handle reconnect for an export.
 955  *
 956  * \param exp export to handle reconnect process
 957  * \param req client reconnect request
 958  *
 959  * \retval -rc in case securitfy flavor can't be changed
 960  * \retval 0 in case none problems
 961  */
 962 static int rev_import_reconnect(struct obd_export *exp,
 963                                 struct ptlrpc_request *req)
 964 {
 965         struct obd_import *revimp = exp->exp_imp_reverse;
 966         struct lustre_handle *lh;
 967         int rc;
 968
 969         /* avoid sending a request until import flags are changed */
 970         ptlrpc_import_enter_resend(revimp);
 971
 972         if (revimp->imp_connection != NULL)
 973                 ptlrpc_connection_put(revimp->imp_connection);
 974
 975         /*
 976          * client from recovery don't have a handle so we need to take from
 977          * request. it may produce situation when wrong client connected
 978          * to recovery as we trust a client uuid
 979          */
 980         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 981         revimp->imp_remote_handle = *lh;
 982
 983         /*
 984          * unknown versions will be caught in
 985          * ptlrpc_handle_server_req_in->lustre_unpack_msg()
 986          */
 987         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
 988
 989         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
 990
 991         rc = rev_import_flags_update(revimp, req);
 992         if (rc != 0) {
 993                 /*
 994                  * it is safe to still be in RECOVERY phase as we are not able
 995                  * to setup correct security flavor so requests are not able to
 996                  * be delivered correctly
 997                  */
 998                 return rc;
 999         }
1000
1001         /* resend all rpc's via new connection */
1002         return ptlrpc_import_recovery_state_machine(revimp);
1003 }
1004
1005 int target_handle_connect(struct ptlrpc_request *req)
1006 {
1007         struct obd_device *target = NULL;
1008         struct obd_export *export = NULL;
1009         /*
1010          * connect handle - filled from target_handle_reconnect in
1011          * reconnect case
1012          */
1013         struct lustre_handle conn;
1014         struct lustre_handle *tmp;
1015         struct obd_uuid cluuid;
1016         char *str;
1017         int rc = 0;
1018         char *target_start;
1019         int target_len;
1020         bool mds_conn = false, lw_client = false, initial_conn = false;
1021         bool mds_mds_conn = false;
1022         bool new_mds_mds_conn = false;
1023         struct obd_connect_data *data, *tmpdata;
1024         int size, tmpsize;
1025         lnet_nid_t *client_nid = NULL;
1026
1027         ENTRY;
1028
1029         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
1030
1031         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
1032         if (str == NULL) {
1033                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
1034                 GOTO(out, rc = -EINVAL);
1035         }
1036
1037         target = class_dev_by_str(str);
1038         if (!target) {
1039                 deuuidify(str, NULL, &target_start, &target_len);
1040                 LCONSOLE_ERROR_MSG(0x137,
1041                                    "%s: not available for connect from %s (no target). If you are running an HA pair check that the target is mounted on the other server.\n",
1042                                    str, libcfs_nid2str(req->rq_peer.nid));
1043                 GOTO(out, rc = -ENODEV);
1044         }
1045
1046         spin_lock(&target->obd_dev_lock);
1047
1048         target->obd_conn_inprogress++;
1049
1050         if (target->obd_stopping || !target->obd_set_up) {
1051                 spin_unlock(&target->obd_dev_lock);
1052
1053                 deuuidify(str, NULL, &target_start, &target_len);
1054                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
1055                               target_len, target_start,
1056                               libcfs_nid2str(req->rq_peer.nid),
1057                               (target->obd_stopping ?
1058                                "stopping" : "not set up"));
1059                 GOTO(out, rc = -ENODEV);
1060         }
1061
1062         if (target->obd_no_conn) {
1063                 spin_unlock(&target->obd_dev_lock);
1064
1065                 CDEBUG(D_INFO,
1066                        "%s: Temporarily refusing client connection from %s\n",
1067                        target->obd_name, libcfs_nid2str(req->rq_peer.nid));
1068                 GOTO(out, rc = -EAGAIN);
1069         }
1070
1071         spin_unlock(&target->obd_dev_lock);
1072
1073         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1074         if (str == NULL) {
1075                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1076                 GOTO(out, rc = -EINVAL);
1077         }
1078
1079         obd_str2uuid(&cluuid, str);
1080
1081         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1082         if (tmp == NULL)
1083                 GOTO(out, rc = -EPROTO);
1084
1085         conn = *tmp;
1086
1087         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1088                                     RCL_CLIENT);
1089         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1090         if (!data)
1091                 GOTO(out, rc = -EPROTO);
1092
1093         rc = req_capsule_server_pack(&req->rq_pill);
1094         if (rc)
1095                 GOTO(out, rc);
1096
1097 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1098         /*
1099          * Don't allow clients to connect that are using old 1.8 format
1100          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1101          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1102          * FULL20 flag should be set on all connections since 2.0, but no
1103          * longer affects behaviour.
1104          *
1105          * Later this check will be disabled and the flag can be retired
1106          * completely once interop with 3.0 is no longer needed.
1107          */
1108         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1109                 GOTO(out, rc = -EPROTO);
1110
1111         /*
1112          * Don't allow liblustre clients to connect.
1113          * - testing was disabled in v2_2_50_0-61-g6a75d65
1114          * - building was disabled in v2_5_58_0-28-g7277179
1115          * - client code was deleted in v2_6_50_0-101-gcdfbc72,
1116          * - clients were refused connect for version difference > 0.0.1.32
1117          */
1118         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1119                 DEBUG_REQ(D_WARNING, req, "Refusing libclient connection");
1120                 GOTO(out, rc = -EPROTO);
1121         }
1122 #endif
1123
1124         /*
1125          * Note: lw_client is needed in MDS-MDS failover during update log
1126          * processing, so we needs to allow lw_client to be connected at
1127          * anytime, instead of only the initial connection
1128          */
1129         lw_client = (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0;
1130
1131         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1132                 initial_conn = true;
1133                 mds_conn = (data->ocd_connect_flags & OBD_CONNECT_MDS) != 0;
1134                 mds_mds_conn = (data->ocd_connect_flags &
1135                                 OBD_CONNECT_MDS_MDS) != 0;
1136
1137                 /*
1138                  * OBD_CONNECT_MNE_SWAB is defined as OBD_CONNECT_MDS_MDS
1139                  * for Imperative Recovery connection from MGC to MGS.
1140                  *
1141                  * Via check OBD_CONNECT_FID, we can distinguish whether
1142                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1143                  * MGC or MDT, since MGC does not use OBD_CONNECT_FID.
1144                  */
1145                 if (!lw_client &&
1146                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1147                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1148                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1149                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1150                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1151                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1152
1153                         /*
1154                          * We do not support the MDT-MDT interoperations with
1155                          * different version MDT because of protocol changes.
1156                          */
1157                         if (unlikely(major != LUSTRE_MAJOR ||
1158                                      minor != LUSTRE_MINOR ||
1159                                      abs(patch - LUSTRE_PATCH) > 3)) {
1160                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the connection from different version MDT (%d.%d.%d.%d) %s %s\n",
1161                                               target->obd_name, LUSTRE_MAJOR,
1162                                               LUSTRE_MINOR, LUSTRE_PATCH,
1163                                               LUSTRE_FIX, major, minor, patch,
1164                                               OBD_OCD_VERSION_FIX(data->ocd_version),
1165                                               libcfs_nid2str(req->rq_peer.nid),
1166                                               str);
1167                                 GOTO(out, rc = -EPROTO);
1168                         }
1169                 }
1170         }
1171
1172         /* lctl gets a backstage, all-access pass. */
1173         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1174                 goto dont_check_exports;
1175
1176         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
1177         if (!export)
1178                 goto no_export;
1179
1180         /* We've found an export in the hash. */
1181
1182         spin_lock(&export->exp_lock);
1183
1184         if (export->exp_connecting) { /* b=9635, et. al. */
1185                 spin_unlock(&export->exp_lock);
1186                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1187                               export->exp_obd->obd_name, export,
1188                               libcfs_nid2str(req->rq_peer.nid));
1189                 class_export_put(export);
1190                 export = NULL;
1191                 rc = -EALREADY;
1192         } else if ((mds_conn || (lw_client && initial_conn) ||
1193                    data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1194                    export->exp_connection != NULL) {
1195                 spin_unlock(&export->exp_lock);
1196                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1197                         /* MDS or LWP reconnected after failover. */
1198                         LCONSOLE_WARN("%s: Received %s connection from %s, removing former export from %s\n",
1199                                       target->obd_name,
1200                                       mds_conn ? "MDS" : "LWP",
1201                                       libcfs_nid2str(req->rq_peer.nid),
1202                                       libcfs_nid2str(export->exp_connection->c_peer.nid));
1203                 } else {
1204                         /* New MDS connection from the same NID. */
1205                         LCONSOLE_WARN("%s: Received new %s connection from %s, removing former export from same NID\n",
1206                                       target->obd_name,
1207                                       mds_conn ? "MDS" : "LWP",
1208                                       libcfs_nid2str(req->rq_peer.nid));
1209                 }
1210
1211                 if (req->rq_peer.nid == export->exp_connection->c_peer.nid &&
1212                     data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
1213                         /*
1214                          * Because exports between MDTs will always be
1215                          * kept, let's do not fail such export if they
1216                          * come from the same NID, otherwise it might
1217                          * cause eviction between MDTs, which might
1218                          * cause namespace inconsistency
1219                          */
1220                         spin_lock(&export->exp_lock);
1221                         export->exp_connecting = 1;
1222                         export->exp_conn_cnt = 0;
1223                         spin_unlock(&export->exp_lock);
1224                         conn.cookie = export->exp_handle.h_cookie;
1225                         rc = EALREADY;
1226                 } else {
1227                         class_fail_export(export);
1228                         class_export_put(export);
1229                         export = NULL;
1230                         rc = 0;
1231                 }
1232         } else if (export->exp_connection != NULL && initial_conn &&
1233                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1234                 spin_unlock(&export->exp_lock);
1235                 /* In MDS failover we have static UUID but NID can change. */
1236                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when existing nid %s is already connected\n",
1237                               target->obd_name, cluuid.uuid,
1238                               libcfs_nid2str(req->rq_peer.nid),
1239                               libcfs_nid2str(
1240                                         export->exp_connection->c_peer.nid));
1241                 rc = -EALREADY;
1242                 class_export_put(export);
1243                 export = NULL;
1244         } else {
1245                 export->exp_connecting = 1;
1246                 spin_unlock(&export->exp_lock);
1247                 LASSERT(export->exp_obd == target);
1248
1249                 rc = target_handle_reconnect(&conn, export, &cluuid);
1250         }
1251
1252         /* If we found an export, we already unlocked. */
1253         if (!export) {
1254 no_export:
1255                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1256         } else if (req->rq_export == NULL &&
1257                    atomic_read(&export->exp_rpc_count) > 0) {
1258                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, still busy with %d references\n",
1259                               target->obd_name, cluuid.uuid,
1260                               libcfs_nid2str(req->rq_peer.nid),
1261                               atomic_read(&export->exp_refcount));
1262                         GOTO(out, rc = -EBUSY);
1263         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
1264                    rc != EALREADY) {
1265                 if (!strstr(cluuid.uuid, "mdt"))
1266                         LCONSOLE_WARN("%s: Rejecting reconnect from the known client %s (at %s) because it is indicating it is a new client",
1267                                       target->obd_name, cluuid.uuid,
1268                                       libcfs_nid2str(req->rq_peer.nid));
1269                 GOTO(out, rc = -EALREADY);
1270         } else {
1271                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1272         }
1273
1274         if (rc < 0)
1275                 GOTO(out, rc);
1276
1277         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %lld last %lld\n",
1278                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1279                target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1280                export, ktime_get_real_seconds(),
1281                export ? export->exp_last_request_time : 0);
1282
1283         /*
1284          * If this is the first time a client connects, reset the recovery
1285          * timer. Discard lightweight connections which might be local.
1286          */
1287         if (!lw_client && rc == 0 && target->obd_recovering)
1288                 check_and_start_recovery_timer(target, req, export == NULL);
1289
1290         /*
1291          * We want to handle EALREADY but *not* -EALREADY from
1292          * target_handle_reconnect(), return reconnection state in a flag.
1293          */
1294         if (rc == EALREADY) {
1295                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1296                 rc = 0;
1297         } else {
1298                 LASSERT(rc == 0);
1299         }
1300
1301         /* Tell the client if we support replayable requests. */
1302         if (target->obd_replayable)
1303                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1304         client_nid = &req->rq_peer.nid;
1305
1306         if (export == NULL) {
1307                 /* allow lightweight connections during recovery */
1308                 /*
1309                  * allow "new" MDT to be connected during recovery, since we
1310                  * need retrieve recovery update records from it
1311                  */
1312                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1313                         struct hrtimer *timer = &target->obd_recovery_timer;
1314                         ktime_t remaining;
1315                         s64 timeout, left;
1316                         int in_progress;
1317                         int connected;
1318                         int known;
1319                         int stale;
1320                         char *msg;
1321
1322                         connected = atomic_read(&target->obd_connected_clients);
1323                         in_progress = atomic_read(&target->obd_lock_replay_clients);
1324                         known = target->obd_max_recoverable_clients;
1325                         stale = target->obd_stale_clients;
1326                         remaining = hrtimer_expires_remaining(timer);
1327                         left = ktime_divns(remaining, NSEC_PER_SEC);
1328
1329                         if (ktime_to_ns(remaining) > 0) {
1330                                 msg = "to recover in";
1331                                 timeout = left;
1332                         } else {
1333                                 msg = "already passed deadline";
1334                                 timeout = -left;
1335                         }
1336
1337                         LCONSOLE_WARN("%s: Denying connection for new client %s (at %s), waiting for %d known clients (%d recovered, %d in progress, and %d evicted) %s %lld:%.02lld\n",
1338                                       target->obd_name, cluuid.uuid,
1339                                       libcfs_nid2str(req->rq_peer.nid), known,
1340                                       connected - in_progress, in_progress,
1341                                       stale, msg, timeout / 60, timeout % 60);
1342                         rc = -EBUSY;
1343                 } else {
1344 dont_check_exports:
1345                         rc = obd_connect(req->rq_svc_thread->t_env,
1346                                          &export, target, &cluuid, data,
1347                                          client_nid);
1348                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1349                                 lustre_msg_add_op_flags(req->rq_repmsg,
1350                                                         MSG_CONNECT_RECOVERING);
1351                         if (rc == 0) {
1352                                 conn.cookie = export->exp_handle.h_cookie;
1353                                 rc = rev_import_init(export);
1354                         }
1355
1356                         if (mds_mds_conn)
1357                                 new_mds_mds_conn = true;
1358                 }
1359         } else {
1360                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1361                                    export, target, &cluuid, data, client_nid);
1362         }
1363         if (rc)
1364                 GOTO(out, rc);
1365
1366         LASSERT(target->u.obt.obt_magic == OBT_MAGIC);
1367         data->ocd_instance = target->u.obt.obt_instance;
1368
1369         /*
1370          * Return only the parts of obd_connect_data that we understand, so the
1371          * client knows that we don't understand the rest.
1372          */
1373         if (data) {
1374                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1375                                                RCL_SERVER);
1376                 tmpdata = req_capsule_server_get(&req->rq_pill,
1377                                                  &RMF_CONNECT_DATA);
1378                 /*
1379                  * Don't use struct assignment here, because the client reply
1380                  * buffer may be smaller/larger than the local struct
1381                  * obd_connect_data.
1382                  */
1383                 memcpy(tmpdata, data, min(tmpsize, size));
1384         }
1385
1386         /*
1387          * If the client and the server are the same node, we will already
1388          * have an export that really points to the client's DLM export,
1389          * because we have a shared handles table.
1390          *
1391          * XXX this will go away when shaver stops sending the "connect" handle
1392          * in the real "remote handle" field of the request --phik 24 Apr 2003
1393          */
1394         ptlrpc_request_change_export(req, export);
1395
1396         spin_lock(&export->exp_lock);
1397         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1398                 spin_unlock(&export->exp_lock);
1399                 CDEBUG(D_RPCTRACE,
1400                        "%s: %s already connected at greater or equal conn_cnt: %d >= %d\n",
1401                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1402                        export->exp_conn_cnt,
1403                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1404
1405                 GOTO(out, rc = -EALREADY);
1406         }
1407         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1408         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1409         spin_unlock(&export->exp_lock);
1410
1411         if (export->exp_connection != NULL) {
1412                 /* Check to see if connection came from another NID. */
1413                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
1414                     !hlist_unhashed(&export->exp_nid_hash))
1415                         cfs_hash_del(export->exp_obd->obd_nid_hash,
1416                                      &export->exp_connection->c_peer.nid,
1417                                      &export->exp_nid_hash);
1418
1419                 ptlrpc_connection_put(export->exp_connection);
1420         }
1421
1422         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
1423                                                        req->rq_self,
1424                                                        &cluuid);
1425         if (hlist_unhashed(&export->exp_nid_hash))
1426                 cfs_hash_add(export->exp_obd->obd_nid_hash,
1427                              &export->exp_connection->c_peer.nid,
1428                              &export->exp_nid_hash);
1429
1430         lustre_msg_set_handle(req->rq_repmsg, &conn);
1431
1432         rc = rev_import_reconnect(export, req);
1433         if (rc != 0)
1434                 GOTO(out, rc);
1435
1436         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1437                 int has_transno;
1438                 __u64 transno = data->ocd_transno;
1439
1440                 spin_lock(&export->exp_lock);
1441                 /*
1442                  * possible race with class_disconnect_stale_exports,
1443                  * export may be already in the eviction process
1444                  */
1445                 if (export->exp_failed) {
1446                         spin_unlock(&export->exp_lock);
1447                         GOTO(out, rc = -ENODEV);
1448                 }
1449                 export->exp_in_recovery = 1;
1450                 export->exp_req_replay_needed = 1;
1451                 export->exp_lock_replay_needed = 1;
1452                 spin_unlock(&export->exp_lock);
1453
1454                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1455                                  MSG_CONNECT_TRANSNO);
1456                 if (has_transno && transno == 0)
1457                         CWARN("Connect with zero transno!\n");
1458
1459                 if (has_transno && transno > 0 &&
1460                     transno < target->obd_next_recovery_transno &&
1461                     transno > target->obd_last_committed) {
1462                         /* Another way is to use cmpxchg() to be lock-free. */
1463                         spin_lock(&target->obd_recovery_task_lock);
1464                         if (transno < target->obd_next_recovery_transno)
1465                                 target->obd_next_recovery_transno = transno;
1466                         spin_unlock(&target->obd_recovery_task_lock);
1467                 }
1468
1469                 atomic_inc(&target->obd_req_replay_clients);
1470                 atomic_inc(&target->obd_lock_replay_clients);
1471                 /*
1472                  * Note: MDS-MDS connection is allowed to be connected during
1473                  * recovery, no matter if the exports needs to be recoveried.
1474                  * Because we need retrieve updates logs from all other MDTs.
1475                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1476                  * also needs to be increased to match other recovery checking
1477                  * condition.
1478                  */
1479                 if (new_mds_mds_conn)
1480                         target->obd_max_recoverable_clients++;
1481                 if (atomic_inc_return(&target->obd_connected_clients) ==
1482                     target->obd_max_recoverable_clients)
1483                         wake_up(&target->obd_next_transno_waitq);
1484         }
1485
1486         /* Tell the client we're in recovery, when client is involved in it. */
1487         if (target->obd_recovering && !lw_client)
1488                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1489
1490 out:
1491         if (export) {
1492                 spin_lock(&export->exp_lock);
1493                 export->exp_connecting = 0;
1494                 spin_unlock(&export->exp_lock);
1495
1496                 class_export_put(export);
1497         }
1498         if (target != NULL) {
1499                 spin_lock(&target->obd_dev_lock);
1500                 target->obd_conn_inprogress--;
1501                 spin_unlock(&target->obd_dev_lock);
1502                 class_decref(target, "find", current);
1503         }
1504         req->rq_status = rc;
1505         RETURN(rc);
1506 }
1507
1508 int target_handle_disconnect(struct ptlrpc_request *req)
1509 {
1510         int rc;
1511
1512         ENTRY;
1513
1514         rc = req_capsule_server_pack(&req->rq_pill);
1515         if (rc)
1516                 RETURN(rc);
1517
1518         /* Keep the rq_export around so we can send the reply. */
1519         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1520
1521         RETURN(0);
1522 }
1523
1524 void target_destroy_export(struct obd_export *exp)
1525 {
1526         struct obd_import *imp = NULL;
1527         /*
1528          * exports created from last_rcvd data, and "fake"
1529          * exports created by lctl don't have an import
1530          */
1531         spin_lock(&exp->exp_lock);
1532         if (exp->exp_imp_reverse != NULL) {
1533                 imp = exp->exp_imp_reverse;
1534                 exp->exp_imp_reverse = NULL;
1535         }
1536         spin_unlock(&exp->exp_lock);
1537         if (imp != NULL)
1538                 client_destroy_import(imp);
1539
1540         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1541         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1542         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1543         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1544 }
1545 EXPORT_SYMBOL(target_destroy_export);
1546
1547 /*
1548  * Recovery functions
1549  */
1550 static void target_request_copy_get(struct ptlrpc_request *req)
1551 {
1552         class_export_rpc_inc(req->rq_export);
1553         LASSERT(list_empty(&req->rq_list));
1554         INIT_LIST_HEAD(&req->rq_replay_list);
1555
1556         /* Increase refcount to keep request in queue. */
1557         atomic_inc(&req->rq_refcount);
1558         /* Let export know it has replays to be handled. */
1559         atomic_inc(&req->rq_export->exp_replay_count);
1560 }
1561
1562 static void target_request_copy_put(struct ptlrpc_request *req)
1563 {
1564         LASSERT(list_empty(&req->rq_replay_list));
1565         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1566
1567         atomic_dec(&req->rq_export->exp_replay_count);
1568         class_export_rpc_dec(req->rq_export);
1569         ptlrpc_server_drop_request(req);
1570 }
1571
1572 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1573 {
1574         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1575         struct obd_export *exp = req->rq_export;
1576         struct ptlrpc_request *reqiter;
1577         struct ptlrpc_request *dup_req = NULL;
1578         int dup = 0;
1579
1580         LASSERT(exp);
1581
1582         spin_lock(&exp->exp_lock);
1583         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1584                             rq_replay_list) {
1585                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1586                         dup_req = reqiter;
1587                         dup = 1;
1588                         break;
1589                 }
1590         }
1591
1592         if (dup) {
1593                 /* We expect it with RESENT and REPLAY flags. */
1594                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1595                     (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1596                         CERROR("invalid flags %x of resent replay\n",
1597                                lustre_msg_get_flags(req->rq_reqmsg));
1598
1599                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1600                         __u32 new_conn;
1601
1602                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1603                         if (new_conn >
1604                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1605                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1606                                                         new_conn);
1607                 }
1608         } else {
1609                 list_add_tail(&req->rq_replay_list,
1610                               &exp->exp_req_replay_queue);
1611         }
1612
1613         spin_unlock(&exp->exp_lock);
1614         return dup;
1615 }
1616
1617 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1618 {
1619         LASSERT(!list_empty(&req->rq_replay_list));
1620         LASSERT(req->rq_export);
1621
1622         spin_lock(&req->rq_export->exp_lock);
1623         list_del_init(&req->rq_replay_list);
1624         spin_unlock(&req->rq_export->exp_lock);
1625 }
1626
1627 static void target_finish_recovery(struct lu_target *lut)
1628 {
1629         struct obd_device *obd = lut->lut_obd;
1630
1631         ENTRY;
1632
1633         /* Only log a recovery message when recovery has occurred. */
1634         if (obd->obd_recovery_start) {
1635                 time64_t now = ktime_get_real_seconds();
1636                 time64_t elapsed_time;
1637
1638                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start,
1639                                      1);
1640                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients %d recovered and %d %s evicted.\n",
1641                               obd->obd_name, (s64)elapsed_time / 60,
1642                               (s64)elapsed_time % 60,
1643                               obd->obd_max_recoverable_clients,
1644                               atomic_read(&obd->obd_connected_clients),
1645                               obd->obd_stale_clients,
1646                               obd->obd_stale_clients == 1 ? "was" : "were");
1647         }
1648
1649         ldlm_reprocess_recovery_done(obd->obd_namespace);
1650         spin_lock(&obd->obd_recovery_task_lock);
1651         if (!list_empty(&obd->obd_req_replay_queue) ||
1652             !list_empty(&obd->obd_lock_replay_queue) ||
1653             !list_empty(&obd->obd_final_req_queue)) {
1654                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1655                        obd->obd_name,
1656                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1657                        list_empty(&obd->obd_lock_replay_queue) ? \
1658                                   "" : "lock ",
1659                        list_empty(&obd->obd_final_req_queue) ? \
1660                                   "" : "final ");
1661                 spin_unlock(&obd->obd_recovery_task_lock);
1662                 LBUG();
1663         }
1664         spin_unlock(&obd->obd_recovery_task_lock);
1665
1666         obd->obd_recovery_end = ktime_get_real_seconds();
1667
1668         /* When recovery finished, cleanup orphans on MDS and OST. */
1669         if (obd->obd_type && OBP(obd, postrecov)) {
1670                 int rc = OBP(obd, postrecov)(obd);
1671
1672                 if (rc < 0)
1673                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1674                                       obd->obd_name, rc);
1675         }
1676         EXIT;
1677 }
1678
1679 static void abort_req_replay_queue(struct obd_device *obd)
1680 {
1681         struct ptlrpc_request *req, *n;
1682         struct list_head abort_list;
1683
1684         INIT_LIST_HEAD(&abort_list);
1685         spin_lock(&obd->obd_recovery_task_lock);
1686         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1687         spin_unlock(&obd->obd_recovery_task_lock);
1688         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1689                 DEBUG_REQ(D_WARNING, req, "aborted:");
1690                 req->rq_status = -ENOTCONN;
1691                 if (ptlrpc_error(req)) {
1692                         DEBUG_REQ(D_ERROR, req,
1693                                   "failed abort_req_reply; skipping");
1694                 }
1695                 target_exp_dequeue_req_replay(req);
1696                 target_request_copy_put(req);
1697         }
1698 }
1699
1700 static void abort_lock_replay_queue(struct obd_device *obd)
1701 {
1702         struct ptlrpc_request *req, *n;
1703         struct list_head abort_list;
1704
1705         INIT_LIST_HEAD(&abort_list);
1706         spin_lock(&obd->obd_recovery_task_lock);
1707         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1708         spin_unlock(&obd->obd_recovery_task_lock);
1709         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1710                 DEBUG_REQ(D_ERROR, req, "aborted:");
1711                 req->rq_status = -ENOTCONN;
1712                 if (ptlrpc_error(req)) {
1713                         DEBUG_REQ(D_ERROR, req,
1714                                   "failed abort_lock_reply; skipping");
1715                 }
1716                 target_request_copy_put(req);
1717         }
1718 }
1719
1720 /*
1721  * Called from a cleanup function if the device is being cleaned up
1722  * forcefully.  The exports should all have been disconnected already,
1723  * the only thing left to do is
1724  * - clear the recovery flags
1725  * - cancel the timer
1726  * - free queued requests and replies, but don't send replies
1727  * Because the obd_stopping flag is set, no new requests should be received.
1728  */
1729 void target_cleanup_recovery(struct obd_device *obd)
1730 {
1731         struct ptlrpc_request *req, *n;
1732         struct list_head clean_list;
1733
1734         INIT_LIST_HEAD(&clean_list);
1735         spin_lock(&obd->obd_dev_lock);
1736         if (!obd->obd_recovering) {
1737                 spin_unlock(&obd->obd_dev_lock);
1738                 EXIT;
1739                 return;
1740         }
1741         obd->obd_recovering = obd->obd_abort_recovery = 0;
1742         spin_unlock(&obd->obd_dev_lock);
1743
1744         spin_lock(&obd->obd_recovery_task_lock);
1745         target_cancel_recovery_timer(obd);
1746         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1747         spin_unlock(&obd->obd_recovery_task_lock);
1748
1749         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1750                 LASSERT(req->rq_reply_state == NULL);
1751                 target_exp_dequeue_req_replay(req);
1752                 target_request_copy_put(req);
1753         }
1754
1755         spin_lock(&obd->obd_recovery_task_lock);
1756         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1757         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1758         spin_unlock(&obd->obd_recovery_task_lock);
1759
1760         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1761                 LASSERT(req->rq_reply_state == NULL);
1762                 target_request_copy_put(req);
1763         }
1764
1765         EXIT;
1766 }
1767 EXPORT_SYMBOL(target_cleanup_recovery);
1768
1769 /* obd_recovery_task_lock should be held */
1770 void target_cancel_recovery_timer(struct obd_device *obd)
1771 {
1772         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1773         hrtimer_cancel(&obd->obd_recovery_timer);
1774 }
1775
1776 static void target_start_recovery_timer(struct obd_device *obd)
1777 {
1778         ktime_t delay;
1779
1780         if (obd->obd_recovery_start != 0)
1781                 return;
1782
1783         spin_lock(&obd->obd_dev_lock);
1784         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1785                 spin_unlock(&obd->obd_dev_lock);
1786                 return;
1787         }
1788
1789         LASSERT(obd->obd_recovery_timeout != 0);
1790
1791         if (obd->obd_recovery_start != 0) {
1792                 spin_unlock(&obd->obd_dev_lock);
1793                 return;
1794         }
1795
1796         delay = ktime_set(obd->obd_recovery_timeout, 0);
1797         hrtimer_start(&obd->obd_recovery_timer, delay, HRTIMER_MODE_REL);
1798         obd->obd_recovery_start = ktime_get_real_seconds();
1799         spin_unlock(&obd->obd_dev_lock);
1800
1801         LCONSOLE_WARN("%s: Will be in recovery for at least %llu:%02llu, or until %d client%s reconnect%s\n",
1802                       obd->obd_name,
1803                       obd->obd_recovery_timeout / 60,
1804                       obd->obd_recovery_timeout % 60,
1805                       obd->obd_max_recoverable_clients,
1806                       (obd->obd_max_recoverable_clients == 1) ? "" : "s",
1807                       (obd->obd_max_recoverable_clients == 1) ? "s" : "");
1808 }
1809
1810 /**
1811  * extend recovery window.
1812  *
1813  * if @extend is true, extend recovery window to have @dr_timeout remaining
1814  * at least; otherwise, make sure the recovery timeout value is not less
1815  * than @dr_timeout.
1816  */
1817 static void extend_recovery_timer(struct obd_device *obd, time_t dr_timeout,
1818                                   bool extend)
1819 {
1820         ktime_t left_ns;
1821         time_t timeout;
1822         time_t left;
1823
1824         spin_lock(&obd->obd_dev_lock);
1825         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1826                 spin_unlock(&obd->obd_dev_lock);
1827                 return;
1828         }
1829         LASSERT(obd->obd_recovery_start != 0);
1830
1831         left_ns = hrtimer_expires_remaining(&obd->obd_recovery_timer);
1832         left = ktime_divns(left_ns, NSEC_PER_SEC);
1833
1834         if (extend) {
1835                 timeout = obd->obd_recovery_timeout;
1836                 /* dr_timeout will happen after the hrtimer has expired.
1837                  * Add the excess time to the soft recovery timeout without
1838                  * exceeding the hard recovery timeout.
1839                  */
1840                 if (dr_timeout > left) {
1841                         timeout += dr_timeout - left;
1842                         timeout = min_t(time_t, obd->obd_recovery_time_hard,
1843                                         timeout);
1844                 }
1845         } else {
1846                 timeout = clamp_t(time_t, dr_timeout, obd->obd_recovery_timeout,
1847                                   obd->obd_recovery_time_hard);
1848         }
1849
1850         if (timeout == obd->obd_recovery_time_hard)
1851                 CWARN("%s: extended recovery timer reached hard limit: %ld, extend: %d\n",
1852                       obd->obd_name, timeout, extend);
1853
1854         if (obd->obd_recovery_timeout < timeout) {
1855                 ktime_t now = ktime_get_real();
1856                 ktime_t end;
1857
1858                 obd->obd_recovery_timeout = timeout;
1859                 end = ktime_set(obd->obd_recovery_start + timeout, 0);
1860                 left_ns = ktime_sub(end, now);
1861                 hrtimer_forward_now(&obd->obd_recovery_timer, left_ns);
1862                 left = ktime_divns(left_ns, NSEC_PER_MSEC);
1863         }
1864         spin_unlock(&obd->obd_dev_lock);
1865
1866         CDEBUG(D_HA, "%s: recovery timer will expire in %ld seconds\n",
1867                 obd->obd_name, left);
1868 }
1869
1870 /* Reset the timer with each new client connection */
1871 /*
1872  * This timer is actually reconnect_timer, which is for making sure
1873  * the total recovery window is at least as big as my reconnect
1874  * attempt timing. So the initial recovery time_out will be set to
1875  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1876  * from client is bigger than this, then the recovery time_out will
1877  * be extended to make sure the client could be reconnected, in the
1878  * process, the timeout from the new client should be ignored.
1879  */
1880 static void
1881 check_and_start_recovery_timer(struct obd_device *obd,
1882                                struct ptlrpc_request *req,
1883                                int new_client)
1884 {
1885         time_t service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1886         struct obd_device_target *obt = &obd->u.obt;
1887
1888         if (!new_client && service_time)
1889                 /*
1890                  * Teach server about old server's estimates, as first guess
1891                  * at how long new requests will take.
1892                  */
1893                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
1894                             service_time);
1895
1896         target_start_recovery_timer(obd);
1897
1898         /*
1899          * Convert the service time to RPC timeout,
1900          * and reuse service_time to limit stack usage.
1901          */
1902         service_time = at_est2timeout(service_time);
1903
1904         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
1905             service_time < at_extra)
1906                 service_time = at_extra;
1907
1908         /*
1909          * We expect other clients to timeout within service_time, then try
1910          * to reconnect, then try the failover server.  The max delay between
1911          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL.
1912          */
1913         service_time += 2 * INITIAL_CONNECT_TIMEOUT;
1914
1915         LASSERT(obt->obt_magic == OBT_MAGIC);
1916         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
1917         if (service_time > obd->obd_recovery_timeout && !new_client)
1918                 extend_recovery_timer(obd, service_time, false);
1919 }
1920
1921 /** Health checking routines */
1922 static inline int exp_connect_healthy(struct obd_export *exp)
1923 {
1924         return exp->exp_in_recovery;
1925 }
1926
1927 /** if export done req_replay or has replay in queue */
1928 static inline int exp_req_replay_healthy(struct obd_export *exp)
1929 {
1930         return (!exp->exp_req_replay_needed ||
1931                 atomic_read(&exp->exp_replay_count) > 0);
1932 }
1933
1934
1935 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
1936 {
1937         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1938                exp_req_replay_healthy(exp);
1939 }
1940
1941 /** if export done lock_replay or has replay in queue */
1942 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1943 {
1944         return (!exp->exp_lock_replay_needed ||
1945                 atomic_read(&exp->exp_replay_count) > 0);
1946 }
1947
1948 static inline int exp_vbr_healthy(struct obd_export *exp)
1949 {
1950         return !exp->exp_vbr_failed;
1951 }
1952
1953 static inline int exp_finished(struct obd_export *exp)
1954 {
1955         return exp->exp_in_recovery && !exp->exp_lock_replay_needed;
1956 }
1957
1958 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
1959 {
1960         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1961                 exp_finished(exp);
1962 }
1963
1964 static int check_for_next_transno(struct lu_target *lut)
1965 {
1966         struct ptlrpc_request *req = NULL;
1967         struct obd_device *obd = lut->lut_obd;
1968         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
1969         int wake_up = 0, connected, completed, queue_len;
1970         __u64 req_transno = 0;
1971         __u64 update_transno = 0;
1972         __u64 next_transno = 0;
1973
1974         ENTRY;
1975
1976         spin_lock(&obd->obd_recovery_task_lock);
1977         if (!list_empty(&obd->obd_req_replay_queue)) {
1978                 req = list_entry(obd->obd_req_replay_queue.next,
1979                                      struct ptlrpc_request, rq_list);
1980                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1981         }
1982
1983         if (tdtd != NULL)
1984                 update_transno = distribute_txn_get_next_transno(tdtd);
1985
1986         connected = atomic_read(&obd->obd_connected_clients);
1987         completed = connected - atomic_read(&obd->obd_req_replay_clients);
1988         queue_len = obd->obd_requests_queued_for_recovery;
1989         next_transno = obd->obd_next_recovery_transno;
1990
1991         CDEBUG(D_HA,
1992                "max: %d, connected: %d, completed: %d, queue_len: %d, req_transno: %llu, next_transno: %llu\n",
1993                obd->obd_max_recoverable_clients, connected, completed,
1994                queue_len, req_transno, next_transno);
1995
1996         if (obd->obd_abort_recovery) {
1997                 CDEBUG(D_HA, "waking for aborted recovery\n");
1998                 wake_up = 1;
1999         } else if (obd->obd_recovery_expired) {
2000                 CDEBUG(D_HA, "waking for expired recovery\n");
2001                 wake_up = 1;
2002         } else if (tdtd != NULL && req != NULL &&
2003                    is_req_replayed_by_update(req)) {
2004                 LASSERTF(req_transno < next_transno,
2005                          "req_transno %llu next_transno%llu\n", req_transno,
2006                          next_transno);
2007                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
2008                        req_transno);
2009                 wake_up = 1;
2010         } else if (req_transno == next_transno ||
2011                    (update_transno != 0 && update_transno <= next_transno)) {
2012                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
2013                 wake_up = 1;
2014         } else if (queue_len > 0 &&
2015                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
2016                 /** handle gaps occured due to lost reply or VBR */
2017                 LASSERTF(req_transno >= next_transno,
2018                          "req_transno: %llu, next_transno: %llu\n",
2019                          req_transno, next_transno);
2020                 CDEBUG(D_HA,
2021                        "%s: waking for gap in transno, VBR is %s (skip: %lld, ql: %d, comp: %d, conn: %d, next: %lld, next_update %lld last_committed: %lld)\n",
2022                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
2023                        next_transno, queue_len, completed, connected,
2024                        req_transno, update_transno, obd->obd_last_committed);
2025                 obd->obd_next_recovery_transno = req_transno;
2026                 wake_up = 1;
2027         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
2028                 CDEBUG(D_HA, "waking for completed recovery\n");
2029                 wake_up = 1;
2030         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
2031                 CDEBUG(D_HA,
2032                        "accepting transno gaps is explicitly allowed by fail_lock, waking up (%lld)\n",
2033                        next_transno);
2034                 obd->obd_next_recovery_transno = req_transno;
2035                 wake_up = 1;
2036         }
2037         spin_unlock(&obd->obd_recovery_task_lock);
2038         return wake_up;
2039 }
2040
2041 static int check_for_next_lock(struct lu_target *lut)
2042 {
2043         struct obd_device *obd = lut->lut_obd;
2044         int wake_up = 0;
2045
2046         spin_lock(&obd->obd_recovery_task_lock);
2047         if (!list_empty(&obd->obd_lock_replay_queue)) {
2048                 CDEBUG(D_HA, "waking for next lock\n");
2049                 wake_up = 1;
2050         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
2051                 CDEBUG(D_HA, "waking for completed lock replay\n");
2052                 wake_up = 1;
2053         } else if (obd->obd_abort_recovery) {
2054                 CDEBUG(D_HA, "waking for aborted recovery\n");
2055                 wake_up = 1;
2056         } else if (obd->obd_recovery_expired) {
2057                 CDEBUG(D_HA, "waking for expired recovery\n");
2058                 wake_up = 1;
2059         }
2060         spin_unlock(&obd->obd_recovery_task_lock);
2061
2062         return wake_up;
2063 }
2064
2065 /**
2066  * wait for recovery events,
2067  * check its status with help of check_routine
2068  * evict dead clients via health_check
2069  */
2070 static int target_recovery_overseer(struct lu_target *lut,
2071                                     int (*check_routine)(struct lu_target *),
2072                                     int (*health_check)(struct obd_export *))
2073 {
2074         struct obd_device *obd = lut->lut_obd;
2075         struct target_distribute_txn_data *tdtd;
2076         time64_t last = 0;
2077         time64_t now;
2078 repeat:
2079         if (obd->obd_recovering && obd->obd_recovery_start == 0) {
2080                 now = ktime_get_seconds();
2081                 if (now - last > 600) {
2082                         LCONSOLE_INFO("%s: in recovery but waiting for the first client to connect\n",
2083                                       obd->obd_name);
2084                         last = now;
2085                 }
2086         }
2087         if (obd->obd_recovery_start != 0 && ktime_get_real_seconds() >=
2088               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
2089                 __u64 next_update_transno = 0;
2090
2091                 /*
2092                  * Only abort the recovery if there are no update recovery
2093                  * left in the queue
2094                  */
2095                 spin_lock(&obd->obd_recovery_task_lock);
2096                 if (lut->lut_tdtd != NULL) {
2097                         next_update_transno =
2098                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2099
2100                         tdtd = lut->lut_tdtd;
2101                         /*
2102                          * If next_update_transno == 0, it probably because
2103                          * updatelog retrieve threads did not get any records
2104                          * yet, let's wait those threads stopped
2105                          */
2106                         if (next_update_transno == 0) {
2107                                 struct l_wait_info lwi = { 0 };
2108
2109                                 l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2110                                        atomic_read(
2111                                        &tdtd->tdtd_recovery_threads_count) == 0,
2112                                        &lwi);
2113
2114                                 next_update_transno =
2115                                         distribute_txn_get_next_transno(
2116                                                                 lut->lut_tdtd);
2117                         }
2118                 }
2119
2120                 if (next_update_transno != 0 && !obd->obd_abort_recovery) {
2121                         obd->obd_next_recovery_transno = next_update_transno;
2122                         spin_unlock(&obd->obd_recovery_task_lock);
2123                         /*
2124                          * Disconnect unfinished exports from clients, and
2125                          * keep connection from MDT to make sure the update
2126                          * recovery will still keep trying until some one
2127                          * manually abort the recovery
2128                          */
2129                         class_disconnect_stale_exports(obd,
2130                                                 exp_finished_or_from_mdt);
2131                         /* Abort all of replay & replay lock req from clients */
2132                         abort_req_replay_queue(obd);
2133                         abort_lock_replay_queue(obd);
2134                         CDEBUG(D_HA,
2135                                "%s: there are still update replay (%#llx)in the queue.\n",
2136                                obd->obd_name, next_update_transno);
2137                 } else {
2138                         obd->obd_abort_recovery = 1;
2139                         spin_unlock(&obd->obd_recovery_task_lock);
2140                         CWARN("%s recovery is aborted by hard timeout\n",
2141                               obd->obd_name);
2142                 }
2143         }
2144
2145         while (wait_event_timeout(obd->obd_next_transno_waitq,
2146                                   check_routine(lut),
2147                                   msecs_to_jiffies(60 * MSEC_PER_SEC)) == 0)
2148                 ; /* wait indefinitely for event, but don't trigger watchdog */
2149
2150         if (obd->obd_abort_recovery) {
2151                 CWARN("recovery is aborted, evict exports in recovery\n");
2152                 if (lut->lut_tdtd != NULL) {
2153                         struct l_wait_info lwi = { 0 };
2154
2155                         tdtd = lut->lut_tdtd;
2156                         /*
2157                          * Let's wait all of the update log recovery thread
2158                          * finished
2159                          */
2160                         l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2161                          atomic_read(&tdtd->tdtd_recovery_threads_count) == 0,
2162                              &lwi);
2163                         /* Then abort the update recovery list */
2164                         dtrq_list_destroy(lut->lut_tdtd);
2165                 }
2166
2167                 /** evict exports which didn't finish recovery yet */
2168                 class_disconnect_stale_exports(obd, exp_finished);
2169                 return 1;
2170         } else if (obd->obd_recovery_expired) {
2171                 obd->obd_recovery_expired = 0;
2172                 /** If some clients died being recovered, evict them */
2173                 LCONSOLE_WARN("%s: recovery is timed out, evict stale exports\n",
2174                               obd->obd_name);
2175                 /** evict cexports with no replay in queue, they are stalled */
2176                 class_disconnect_stale_exports(obd, health_check);
2177
2178                 /** continue with VBR */
2179                 spin_lock(&obd->obd_dev_lock);
2180                 obd->obd_version_recov = 1;
2181                 spin_unlock(&obd->obd_dev_lock);
2182                 /**
2183                  * reset timer, recovery will proceed with versions now,
2184                  * timeout is set just to handle reconnection delays
2185                  */
2186                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2187                 /**
2188                  * Wait for recovery events again, after evicting bad clients
2189                  */
2190                 goto repeat;
2191         }
2192         return 0;
2193 }
2194
2195 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2196 {
2197         struct obd_device *obd = lut->lut_obd;
2198         struct ptlrpc_request *req = NULL;
2199
2200         CDEBUG(D_HA, "Waiting for lock\n");
2201         if (target_recovery_overseer(lut, check_for_next_lock,
2202                                      exp_lock_replay_healthy))
2203                 abort_lock_replay_queue(obd);
2204
2205         spin_lock(&obd->obd_recovery_task_lock);
2206         if (!list_empty(&obd->obd_lock_replay_queue)) {
2207                 req = list_entry(obd->obd_lock_replay_queue.next,
2208                                      struct ptlrpc_request, rq_list);
2209                 list_del_init(&req->rq_list);
2210                 spin_unlock(&obd->obd_recovery_task_lock);
2211         } else {
2212                 spin_unlock(&obd->obd_recovery_task_lock);
2213                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2214                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2215                 /** evict exports failed VBR */
2216                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2217         }
2218         return req;
2219 }
2220
2221 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2222 {
2223         struct ptlrpc_request *req = NULL;
2224
2225         spin_lock(&obd->obd_recovery_task_lock);
2226         if (!list_empty(&obd->obd_final_req_queue)) {
2227                 req = list_entry(obd->obd_final_req_queue.next,
2228                                      struct ptlrpc_request, rq_list);
2229                 list_del_init(&req->rq_list);
2230                 spin_unlock(&obd->obd_recovery_task_lock);
2231                 if (req->rq_export->exp_in_recovery) {
2232                         spin_lock(&req->rq_export->exp_lock);
2233                         req->rq_export->exp_in_recovery = 0;
2234                         spin_unlock(&req->rq_export->exp_lock);
2235                 }
2236         } else {
2237                 spin_unlock(&obd->obd_recovery_task_lock);
2238         }
2239         return req;
2240 }
2241
2242 static void handle_recovery_req(struct ptlrpc_thread *thread,
2243                                 struct ptlrpc_request *req,
2244                                 svc_handler_t handler)
2245 {
2246         ENTRY;
2247
2248         /**
2249          * export can be evicted during recovery, no need to handle replays for
2250          * it after that, discard such request silently
2251          */
2252         if (req->rq_export->exp_disconnected)
2253                 RETURN_EXIT;
2254
2255         req->rq_session.lc_thread = thread;
2256         req->rq_svc_thread = thread;
2257         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2258
2259         /* thread context */
2260         lu_context_enter(&thread->t_env->le_ctx);
2261         (void)handler(req);
2262         lu_context_exit(&thread->t_env->le_ctx);
2263
2264         /* don't reset timer for final stage */
2265         if (!exp_finished(req->rq_export)) {
2266                 time_t to = obd_timeout;
2267
2268                 /**
2269                  * Add request timeout to the recovery time so next request from
2270                  * this client may come in recovery time
2271                  */
2272                 if (!AT_OFF) {
2273                         struct ptlrpc_service_part *svcpt;
2274
2275                         svcpt = req->rq_rqbd->rqbd_svcpt;
2276                         /*
2277                          * If the server sent early reply for this request,
2278                          * the client will recalculate the timeout according to
2279                          * current server estimate service time, so we will
2280                          * use the maxium timeout here for waiting the client
2281                          * sending the next req
2282                          */
2283                         to = max_t(time_t,
2284                                    at_est2timeout(at_get(&svcpt->scp_at_estimate)),
2285                                    lustre_msg_get_timeout(req->rq_reqmsg));
2286                         /*
2287                          * Add 2 net_latency, one for balance rq_deadline
2288                          * (see ptl_send_rpc), one for resend the req to server,
2289                          * Note: client will pack net_latency in replay req
2290                          * (see ptlrpc_replay_req)
2291                          */
2292                         to += 2 * lustre_msg_get_service_time(req->rq_reqmsg);
2293                 }
2294                 extend_recovery_timer(class_exp2obd(req->rq_export), to, true);
2295         }
2296         EXIT;
2297 }
2298
2299 /** Checking routines for recovery */
2300 static int check_for_recovery_ready(struct lu_target *lut)
2301 {
2302         struct obd_device *obd = lut->lut_obd;
2303         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2304
2305         CDEBUG(D_HA,
2306                "connected %d stale %d max_recoverable_clients %d abort %d expired %d\n",
2307                clnts, obd->obd_stale_clients, obd->obd_max_recoverable_clients,
2308                obd->obd_abort_recovery, obd->obd_recovery_expired);
2309
2310         if (!obd->obd_abort_recovery && !obd->obd_recovery_expired) {
2311                 LASSERT(clnts <= obd->obd_max_recoverable_clients);
2312                 if (clnts + obd->obd_stale_clients <
2313                     obd->obd_max_recoverable_clients)
2314                         return 0;
2315         }
2316
2317         if (lut->lut_tdtd != NULL) {
2318                 if (!lut->lut_tdtd->tdtd_replay_ready &&
2319                     !obd->obd_abort_recovery) {
2320                         /*
2321                          * Let's extend recovery timer, in case the recovery
2322                          * timer expired, and some clients got evicted
2323                          */
2324                         extend_recovery_timer(obd, obd->obd_recovery_timeout,
2325                                               true);
2326                         CDEBUG(D_HA,
2327                                "%s update recovery is not ready, extend recovery %llu\n",
2328                                obd->obd_name, obd->obd_recovery_timeout);
2329                         return 0;
2330                 }
2331         }
2332
2333         return 1;
2334 }
2335
2336 enum {
2337         REQUEST_RECOVERY = 1,
2338         UPDATE_RECOVERY = 2,
2339 };
2340
2341 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2342 {
2343         __u64 transno = 0;
2344
2345         if (!list_empty(&obd->obd_req_replay_queue)) {
2346                 struct ptlrpc_request *req;
2347
2348                 req = list_entry(obd->obd_req_replay_queue.next,
2349                                  struct ptlrpc_request, rq_list);
2350                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2351         }
2352
2353         return transno;
2354 }
2355
2356 static __u64 get_next_transno(struct lu_target *lut, int *type)
2357 {
2358         struct obd_device *obd = lut->lut_obd;
2359         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2360         __u64 transno = 0;
2361         __u64 update_transno;
2362
2363         ENTRY;
2364
2365         transno = get_next_replay_req_transno(obd);
2366         if (type != NULL)
2367                 *type = REQUEST_RECOVERY;
2368
2369         if (tdtd == NULL)
2370                 RETURN(transno);
2371
2372         update_transno = distribute_txn_get_next_transno(tdtd);
2373         if (transno == 0 || (transno >= update_transno &&
2374                              update_transno != 0)) {
2375                 transno = update_transno;
2376                 if (type != NULL)
2377                         *type = UPDATE_RECOVERY;
2378         }
2379
2380         RETURN(transno);
2381 }
2382
2383 /**
2384  * drop duplicate replay request
2385  *
2386  * Because the operation has been replayed by update recovery, the request
2387  * with the same transno will be dropped and also notify the client to send
2388  * next replay request.
2389  *
2390  * \param[in] env       execution environment
2391  * \param[in] obd       failover obd device
2392  * \param[in] req       request to be dropped
2393  */
2394 static void drop_duplicate_replay_req(struct lu_env *env,
2395                                       struct obd_device *obd,
2396                                       struct ptlrpc_request *req)
2397 {
2398         DEBUG_REQ(D_HA, req,
2399                   "remove t%lld from %s because of duplicate update records are found.\n",
2400                   lustre_msg_get_transno(req->rq_reqmsg),
2401                   libcfs_nid2str(req->rq_peer.nid));
2402
2403         /*
2404          * Right now, only for MDS reint operation update replay and
2405          * normal request replay can have the same transno
2406          */
2407         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT) {
2408                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2409                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2410                 if (likely(req->rq_export))
2411                         target_committed_to_req(req);
2412                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2413                 target_send_reply(req, req->rq_status, 0);
2414         } else {
2415                 DEBUG_REQ(D_ERROR, req, "wrong opc from %s\n",
2416                 libcfs_nid2str(req->rq_peer.nid));
2417         }
2418         target_exp_dequeue_req_replay(req);
2419         target_request_copy_put(req);
2420         obd->obd_replayed_requests++;
2421 }
2422
2423 static void replay_request_or_update(struct lu_env *env,
2424                                      struct lu_target *lut,
2425                                      struct target_recovery_data *trd,
2426                                      struct ptlrpc_thread *thread)
2427 {
2428         struct obd_device *obd = lut->lut_obd;
2429         struct ptlrpc_request *req = NULL;
2430         int type;
2431         __u64 transno;
2432
2433         ENTRY;
2434
2435         CDEBUG(D_HA, "Waiting for transno %lld\n",
2436                obd->obd_next_recovery_transno);
2437
2438         /* Replay all of request and update by transno */
2439         do {
2440                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2441
2442                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2443
2444                 /**
2445                  * It is needed to extend recovery window above
2446                  *  recovery_time_soft. Extending is possible only in the
2447                  *  end of recovery window (see more details in
2448                  *  handle_recovery_req()).
2449                  */
2450                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2451
2452                 if (target_recovery_overseer(lut, check_for_next_transno,
2453                                         exp_req_replay_healthy_or_from_mdt)) {
2454                         abort_req_replay_queue(obd);
2455                         abort_lock_replay_queue(obd);
2456                         goto abort;
2457                 }
2458
2459                 spin_lock(&obd->obd_recovery_task_lock);
2460                 transno = get_next_transno(lut, &type);
2461                 if (type == REQUEST_RECOVERY && transno != 0) {
2462                         /*
2463                          * Drop replay request from client side, if the
2464                          * replay has been executed by update with the
2465                          * same transno
2466                          */
2467                         req = list_entry(obd->obd_req_replay_queue.next,
2468                                         struct ptlrpc_request, rq_list);
2469
2470                         list_del_init(&req->rq_list);
2471                         obd->obd_requests_queued_for_recovery--;
2472                         spin_unlock(&obd->obd_recovery_task_lock);
2473
2474                         /*
2475                          * Let's check if the request has been redone by
2476                          * update replay
2477                          */
2478                         if (is_req_replayed_by_update(req)) {
2479                                 struct distribute_txn_replay_req *dtrq;
2480
2481                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2482                                                                       transno);
2483                                 LASSERT(dtrq != NULL);
2484                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2485                                 list_del_init(&dtrq->dtrq_list);
2486                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2487                                 dtrq_destroy(dtrq);
2488
2489                                 drop_duplicate_replay_req(env, obd, req);
2490
2491                                 continue;
2492                         }
2493
2494                         LASSERT(trd->trd_processing_task == current_pid());
2495                         DEBUG_REQ(D_HA, req, "processing x%llu t%lld from %s",
2496                                   req->rq_xid,
2497                                   lustre_msg_get_transno(req->rq_reqmsg),
2498                                   libcfs_nid2str(req->rq_peer.nid));
2499
2500                         handle_recovery_req(thread, req,
2501                                             trd->trd_recovery_handler);
2502                         /**
2503                          * bz18031: increase next_recovery_transno before
2504                          * target_request_copy_put() will drop exp_rpc reference
2505                          */
2506                         spin_lock(&obd->obd_recovery_task_lock);
2507                         obd->obd_next_recovery_transno++;
2508                         spin_unlock(&obd->obd_recovery_task_lock);
2509                         target_exp_dequeue_req_replay(req);
2510                         target_request_copy_put(req);
2511                         obd->obd_replayed_requests++;
2512                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2513                         struct distribute_txn_replay_req *dtrq;
2514                         int rc;
2515
2516                         spin_unlock(&obd->obd_recovery_task_lock);
2517
2518                         LASSERT(tdtd != NULL);
2519                         dtrq = distribute_txn_get_next_req(tdtd);
2520                         lu_context_enter(&thread->t_env->le_ctx);
2521                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2522                         lu_context_exit(&thread->t_env->le_ctx);
2523                         extend_recovery_timer(obd, obd_timeout, true);
2524
2525                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2526                                 CDEBUG(D_HA,
2527                                        "Move x%llu t%llu to finish list\n",
2528                                        dtrq->dtrq_xid,
2529                                        dtrq->dtrq_master_transno);
2530
2531                                 /* Add it to the replay finish list */
2532                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2533                                 list_add(&dtrq->dtrq_list,
2534                                          &tdtd->tdtd_replay_finish_list);
2535                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2536
2537                                 spin_lock(&obd->obd_recovery_task_lock);
2538                                 if (transno == obd->obd_next_recovery_transno)
2539                                         obd->obd_next_recovery_transno++;
2540                                 else if (transno >
2541                                          obd->obd_next_recovery_transno)
2542                                         obd->obd_next_recovery_transno =
2543                                                                 transno + 1;
2544                                 spin_unlock(&obd->obd_recovery_task_lock);
2545                         } else {
2546                                 dtrq_destroy(dtrq);
2547                         }
2548                 } else {
2549                         spin_unlock(&obd->obd_recovery_task_lock);
2550 abort:
2551                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2552                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2553                         /** evict exports failed VBR */
2554                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2555                         break;
2556                 }
2557         } while (1);
2558 }
2559
2560 static int target_recovery_thread(void *arg)
2561 {
2562         struct lu_target *lut = arg;
2563         struct obd_device *obd = lut->lut_obd;
2564         struct ptlrpc_request *req;
2565         struct target_recovery_data *trd = &obd->obd_recovery_data;
2566         unsigned long delta;
2567         struct lu_env *env;
2568         struct ptlrpc_thread *thread = NULL;
2569         int rc = 0;
2570
2571         ENTRY;
2572
2573         unshare_fs_struct();
2574         OBD_ALLOC_PTR(thread);
2575         if (thread == NULL)
2576                 RETURN(-ENOMEM);
2577
2578         OBD_ALLOC_PTR(env);
2579         if (env == NULL)
2580                 GOTO(out_thread, rc = -ENOMEM);
2581         rc = lu_env_add(env);
2582         if (rc)
2583                 GOTO(out_env, rc);
2584
2585         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2586         if (rc)
2587                 GOTO(out_env_remove, rc);
2588
2589         thread->t_env = env;
2590         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2591         env->le_ctx.lc_thread = thread;
2592         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2593
2594         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2595                current_pid());
2596         trd->trd_processing_task = current_pid();
2597
2598         spin_lock(&obd->obd_dev_lock);
2599         obd->obd_recovering = 1;
2600         spin_unlock(&obd->obd_dev_lock);
2601         complete(&trd->trd_starting);
2602
2603         /* first of all, we have to know the first transno to replay */
2604         if (target_recovery_overseer(lut, check_for_recovery_ready,
2605                                      exp_connect_healthy)) {
2606                 abort_req_replay_queue(obd);
2607                 abort_lock_replay_queue(obd);
2608                 if (lut->lut_tdtd != NULL)
2609                         dtrq_list_destroy(lut->lut_tdtd);
2610         }
2611
2612         /* next stage: replay requests or update */
2613         delta = jiffies;
2614         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2615                atomic_read(&obd->obd_req_replay_clients),
2616                obd->obd_next_recovery_transno);
2617         replay_request_or_update(env, lut, trd, thread);
2618
2619         /**
2620          * The second stage: replay locks
2621          */
2622         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2623                atomic_read(&obd->obd_lock_replay_clients));
2624         while ((req = target_next_replay_lock(lut))) {
2625                 LASSERT(trd->trd_processing_task == current_pid());
2626                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
2627                           libcfs_nid2str(req->rq_peer.nid));
2628                 handle_recovery_req(thread, req,
2629                                     trd->trd_recovery_handler);
2630                 target_request_copy_put(req);
2631                 obd->obd_replayed_locks++;
2632         }
2633
2634         /**
2635          * The third stage: reply on final pings, at this moment all clients
2636          * must have request in final queue
2637          */
2638         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2639         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2640         /** Update server last boot epoch */
2641         tgt_boot_epoch_update(lut);
2642         /*
2643          * We drop recoverying flag to forward all new requests
2644          * to regular mds_handle() since now
2645          */
2646         spin_lock(&obd->obd_dev_lock);
2647         obd->obd_recovering = obd->obd_abort_recovery = 0;
2648         spin_unlock(&obd->obd_dev_lock);
2649         spin_lock(&obd->obd_recovery_task_lock);
2650         target_cancel_recovery_timer(obd);
2651         spin_unlock(&obd->obd_recovery_task_lock);
2652         while ((req = target_next_final_ping(obd))) {
2653                 LASSERT(trd->trd_processing_task == current_pid());
2654                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
2655                           libcfs_nid2str(req->rq_peer.nid));
2656                 handle_recovery_req(thread, req,
2657                                     trd->trd_recovery_handler);
2658                 /*
2659                  * Because the waiting client can not send ping to server,
2660                  * so we need refresh the last_request_time, to avoid the
2661                  * export is being evicted
2662                  */
2663                 ptlrpc_update_export_timer(req->rq_export, 0);
2664                 target_request_copy_put(req);
2665         }
2666
2667         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2668         CDEBUG(D_INFO, "4: recovery completed in %lus - %d/%d reqs/locks\n",
2669                delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2670         if (delta > OBD_RECOVERY_TIME_SOFT) {
2671                 CWARN("too long recovery - read logs\n");
2672                 libcfs_debug_dumplog();
2673         }
2674
2675         target_finish_recovery(lut);
2676         lu_context_fini(&env->le_ctx);
2677         trd->trd_processing_task = 0;
2678         complete_all(&trd->trd_finishing);
2679         tgt_io_thread_done(thread);
2680 out_env_remove:
2681         lu_env_remove(env);
2682 out_env:
2683         OBD_FREE_PTR(env);
2684 out_thread:
2685         OBD_FREE_PTR(thread);
2686         RETURN(rc);
2687 }
2688
2689 static int target_start_recovery_thread(struct lu_target *lut,
2690                                         svc_handler_t handler)
2691 {
2692         struct obd_device *obd = lut->lut_obd;
2693         int rc = 0;
2694         struct target_recovery_data *trd = &obd->obd_recovery_data;
2695         int index;
2696
2697         memset(trd, 0, sizeof(*trd));
2698         init_completion(&trd->trd_starting);
2699         init_completion(&trd->trd_finishing);
2700         trd->trd_recovery_handler = handler;
2701
2702         rc = server_name2index(obd->obd_name, &index, NULL);
2703         if (rc < 0)
2704                 return rc;
2705
2706         if (!IS_ERR(kthread_run(target_recovery_thread,
2707                                 lut, "tgt_recover_%d", index))) {
2708                 wait_for_completion(&trd->trd_starting);
2709                 LASSERT(obd->obd_recovering != 0);
2710         } else {
2711                 rc = -ECHILD;
2712         }
2713
2714         return rc;
2715 }
2716
2717 void target_stop_recovery_thread(struct obd_device *obd)
2718 {
2719         if (obd->obd_recovery_data.trd_processing_task > 0) {
2720                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2721                 /** recovery can be done but postrecovery is not yet */
2722                 spin_lock(&obd->obd_dev_lock);
2723                 if (obd->obd_recovering) {
2724                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2725                         obd->obd_abort_recovery = 1;
2726                         wake_up(&obd->obd_next_transno_waitq);
2727                 }
2728                 spin_unlock(&obd->obd_dev_lock);
2729                 wait_for_completion(&trd->trd_finishing);
2730         }
2731 }
2732 EXPORT_SYMBOL(target_stop_recovery_thread);
2733
2734 void target_recovery_fini(struct obd_device *obd)
2735 {
2736         class_disconnect_exports(obd);
2737         target_stop_recovery_thread(obd);
2738         target_cleanup_recovery(obd);
2739 }
2740 EXPORT_SYMBOL(target_recovery_fini);
2741
2742 static enum hrtimer_restart target_recovery_expired(struct hrtimer *timer)
2743 {
2744         struct obd_device *obd = container_of(timer, struct obd_device,
2745                                               obd_recovery_timer);
2746
2747         CDEBUG(D_HA,
2748                "%s: recovery timed out; %d clients are still in recovery after %llu seconds (%d clients connected)\n",
2749                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2750                ktime_get_real_seconds() - obd->obd_recovery_start,
2751                atomic_read(&obd->obd_connected_clients));
2752
2753         obd->obd_recovery_expired = 1;
2754         wake_up(&obd->obd_next_transno_waitq);
2755         return HRTIMER_NORESTART;
2756 }
2757
2758 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2759 {
2760         struct obd_device *obd = lut->lut_obd;
2761
2762         if (lut->lut_bottom->dd_rdonly)
2763                 return;
2764
2765         if (obd->obd_max_recoverable_clients == 0) {
2766                 /** Update server last boot epoch */
2767                 tgt_boot_epoch_update(lut);
2768                 return;
2769         }
2770
2771         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2772                "last_transno %llu\n", obd->obd_name,
2773                obd->obd_max_recoverable_clients, obd->obd_last_committed);
2774         LASSERT(obd->obd_stopping == 0);
2775         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2776         obd->obd_recovery_start = 0;
2777         obd->obd_recovery_end = 0;
2778
2779         hrtimer_init(&obd->obd_recovery_timer, CLOCK_REALTIME,
2780                      HRTIMER_MODE_REL);
2781         obd->obd_recovery_timer.function = &target_recovery_expired;
2782         target_start_recovery_thread(lut, handler);
2783 }
2784 EXPORT_SYMBOL(target_recovery_init);
2785
2786 static int target_process_req_flags(struct obd_device *obd,
2787                                     struct ptlrpc_request *req)
2788 {
2789         struct obd_export *exp = req->rq_export;
2790
2791         LASSERT(exp != NULL);
2792         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2793                 /* client declares he's ready to replay locks */
2794                 spin_lock(&exp->exp_lock);
2795                 if (exp->exp_req_replay_needed) {
2796                         exp->exp_req_replay_needed = 0;
2797                         spin_unlock(&exp->exp_lock);
2798
2799                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2800                         atomic_dec(&obd->obd_req_replay_clients);
2801                 } else {
2802                         spin_unlock(&exp->exp_lock);
2803                 }
2804         }
2805         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2806                 /*
2807                  * client declares he's ready to complete recovery
2808                  * so, we put the request on th final queue
2809                  */
2810                 spin_lock(&exp->exp_lock);
2811                 if (exp->exp_lock_replay_needed) {
2812                         exp->exp_lock_replay_needed = 0;
2813                         spin_unlock(&exp->exp_lock);
2814
2815                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
2816                         atomic_dec(&obd->obd_lock_replay_clients);
2817                 } else {
2818                         spin_unlock(&exp->exp_lock);
2819                 }
2820         }
2821         return 0;
2822 }
2823
2824 int target_queue_recovery_request(struct ptlrpc_request *req,
2825                                   struct obd_device *obd)
2826 {
2827         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
2828         struct ptlrpc_request *reqiter;
2829         int inserted = 0;
2830
2831         ENTRY;
2832
2833         if (obd->obd_recovery_data.trd_processing_task == current_pid()) {
2834                 /* Processing the queue right now, don't re-add. */
2835                 RETURN(1);
2836         }
2837
2838         target_process_req_flags(obd, req);
2839
2840         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2841                 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
2842                         if (cfs_fail_val == 1) {
2843                                 cfs_race_state = 1;
2844                                 cfs_fail_val = 0;
2845                                 wake_up(&cfs_race_waitq);
2846
2847                                 set_current_state(TASK_INTERRUPTIBLE);
2848                                 schedule_timeout(cfs_time_seconds(1));
2849                         }
2850                 }
2851
2852                 /*
2853                  * client declares he's ready to complete recovery
2854                  * so, we put the request on th final queue
2855                  */
2856                 target_request_copy_get(req);
2857                 DEBUG_REQ(D_HA, req, "queue final req");
2858                 wake_up(&obd->obd_next_transno_waitq);
2859                 spin_lock(&obd->obd_recovery_task_lock);
2860                 if (obd->obd_recovering) {
2861                         struct ptlrpc_request *tmp;
2862                         struct ptlrpc_request *duplicate = NULL;
2863
2864                         if (likely(!req->rq_export->exp_replay_done)) {
2865                                 req->rq_export->exp_replay_done = 1;
2866                                 list_add_tail(&req->rq_list,
2867                                               &obd->obd_final_req_queue);
2868                                 spin_unlock(&obd->obd_recovery_task_lock);
2869                                 RETURN(0);
2870                         }
2871
2872                         /*
2873                          * XXX O(n), but only happens if final ping is
2874                          * timed out, probably reorganize the list as
2875                          * a hash list later
2876                          */
2877                         list_for_each_entry_safe(reqiter, tmp,
2878                                                  &obd->obd_final_req_queue,
2879                                                  rq_list) {
2880                                 if (reqiter->rq_export == req->rq_export) {
2881                                         list_del_init(&reqiter->rq_list);
2882                                         duplicate = reqiter;
2883                                         break;
2884                                 }
2885                         }
2886
2887                         list_add_tail(&req->rq_list,
2888                                       &obd->obd_final_req_queue);
2889                         req->rq_export->exp_replay_done = 1;
2890                         spin_unlock(&obd->obd_recovery_task_lock);
2891
2892                         if (duplicate != NULL) {
2893                                 DEBUG_REQ(D_HA, duplicate,
2894                                           "put prev final req\n");
2895                                 target_request_copy_put(duplicate);
2896                         }
2897                         RETURN(0);
2898                 } else {
2899                         spin_unlock(&obd->obd_recovery_task_lock);
2900                         target_request_copy_put(req);
2901                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
2902                 }
2903         }
2904         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2905                 /* client declares he's ready to replay locks */
2906                 target_request_copy_get(req);
2907                 DEBUG_REQ(D_HA, req, "queue lock replay req");
2908                 wake_up(&obd->obd_next_transno_waitq);
2909                 spin_lock(&obd->obd_recovery_task_lock);
2910                 LASSERT(obd->obd_recovering);
2911                 /* usually due to recovery abort */
2912                 if (!req->rq_export->exp_in_recovery) {
2913                         spin_unlock(&obd->obd_recovery_task_lock);
2914                         target_request_copy_put(req);
2915                         RETURN(-ENOTCONN);
2916                 }
2917                 LASSERT(req->rq_export->exp_lock_replay_needed);
2918                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
2919                 spin_unlock(&obd->obd_recovery_task_lock);
2920                 RETURN(0);
2921         }
2922
2923         /*
2924          * CAVEAT EMPTOR: The incoming request message has been swabbed
2925          * (i.e. buflens etc are in my own byte order), but type-dependent
2926          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed.
2927          */
2928
2929         if (!transno) {
2930                 INIT_LIST_HEAD(&req->rq_list);
2931                 DEBUG_REQ(D_HA, req, "not queueing");
2932                 RETURN(1);
2933         }
2934
2935         /*
2936          * If we're processing the queue, we want don't want to queue this
2937          * message.
2938          *
2939          * Also, if this request has a transno less than the one we're waiting
2940          * for, we should process it now.  It could (and currently always will)
2941          * be an open request for a descriptor that was opened some time ago.
2942          *
2943          * Also, a resent, replayed request that has already been
2944          * handled will pass through here and be processed immediately.
2945          */
2946         CDEBUG(D_HA,
2947                "Next recovery transno: %llu, current: %llu, replaying\n",
2948                obd->obd_next_recovery_transno, transno);
2949
2950         /*
2951          * If the request has been replayed by update replay, then sends this
2952          * request to the recovery thread (replay_request_or_update()), where
2953          * it will be handled
2954          */
2955         spin_lock(&obd->obd_recovery_task_lock);
2956         if (transno < obd->obd_next_recovery_transno &&
2957             !is_req_replayed_by_update(req)) {
2958                 /* Processing the queue right now, don't re-add. */
2959                 LASSERT(list_empty(&req->rq_list));
2960                 spin_unlock(&obd->obd_recovery_task_lock);
2961                 RETURN(1);
2962         }
2963         spin_unlock(&obd->obd_recovery_task_lock);
2964
2965         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2966                 RETURN(0);
2967
2968         target_request_copy_get(req);
2969         if (!req->rq_export->exp_in_recovery) {
2970                 target_request_copy_put(req);
2971                 RETURN(-ENOTCONN);
2972         }
2973         LASSERT(req->rq_export->exp_req_replay_needed);
2974
2975         if (target_exp_enqueue_req_replay(req)) {
2976                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2977                 target_request_copy_put(req);
2978                 RETURN(0);
2979         }
2980
2981         /* XXX O(n^2) */
2982         spin_lock(&obd->obd_recovery_task_lock);
2983         LASSERT(obd->obd_recovering);
2984         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
2985                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2986                         list_add_tail(&req->rq_list, &reqiter->rq_list);
2987                         inserted = 1;
2988                         goto added;
2989                 }
2990
2991                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2992                              transno)) {
2993                         DEBUG_REQ(D_ERROR, req,
2994                                   "dropping replay: transno has been claimed by another client");
2995                         spin_unlock(&obd->obd_recovery_task_lock);
2996                         target_exp_dequeue_req_replay(req);
2997                         target_request_copy_put(req);
2998                         RETURN(0);
2999                 }
3000         }
3001 added:
3002         if (!inserted)
3003                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
3004
3005         obd->obd_requests_queued_for_recovery++;
3006         spin_unlock(&obd->obd_recovery_task_lock);
3007         wake_up(&obd->obd_next_transno_waitq);
3008         RETURN(0);
3009 }
3010
3011 void target_committed_to_req(struct ptlrpc_request *req)
3012 {
3013         struct obd_export *exp = req->rq_export;
3014
3015         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
3016                 lustre_msg_set_last_committed(req->rq_repmsg,
3017                                               exp->exp_last_committed);
3018         else
3019                 DEBUG_REQ(D_IOCTL, req,
3020                           "not sending last_committed update (%d/%d)",
3021                           exp->exp_obd->obd_no_transno,
3022                           req->rq_repmsg == NULL);
3023
3024         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
3025                exp->exp_last_committed, req->rq_transno, req->rq_xid);
3026 }
3027
3028 #endif /* HAVE_SERVER_SUPPORT */
3029
3030 /**
3031  * Packs current SLV and Limit into \a req.
3032  */
3033 int target_pack_pool_reply(struct ptlrpc_request *req)
3034 {
3035         struct obd_device *obd;
3036
3037         ENTRY;
3038
3039         /*
3040          * Check that we still have all structures alive as this may
3041          * be some late RPC at shutdown time.
3042          */
3043         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
3044                      !exp_connect_lru_resize(req->rq_export))) {
3045                 lustre_msg_set_slv(req->rq_repmsg, 0);
3046                 lustre_msg_set_limit(req->rq_repmsg, 0);
3047                 RETURN(0);
3048         }
3049
3050         /* OBD is alive here as export is alive, which we checked above. */
3051         obd = req->rq_export->exp_obd;
3052
3053         read_lock(&obd->obd_pool_lock);
3054         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
3055         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
3056         read_unlock(&obd->obd_pool_lock);
3057
3058         RETURN(0);
3059 }
3060
3061 static int target_send_reply_msg(struct ptlrpc_request *req,
3062                                  int rc, int fail_id)
3063 {
3064         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
3065                 DEBUG_REQ(D_ERROR, req, "dropping reply");
3066                 return -ECOMM;
3067         }
3068         /*
3069          * We can have a null rq_reqmsg in the event of bad signature or
3070          * no context when unwrapping
3071          */
3072         if (req->rq_reqmsg &&
3073             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
3074             OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
3075                 return -ECOMM;
3076
3077         if (unlikely(rc)) {
3078                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
3079                 req->rq_status = rc;
3080                 return ptlrpc_send_error(req, 1);
3081         }
3082         DEBUG_REQ(D_NET, req, "sending reply");
3083
3084         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
3085 }
3086
3087 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
3088 {
3089         struct ptlrpc_service_part *svcpt;
3090         int netrc;
3091         struct ptlrpc_reply_state *rs;
3092         struct obd_export *exp;
3093
3094         ENTRY;
3095
3096         if (req->rq_no_reply) {
3097                 EXIT;
3098                 return;
3099         }
3100
3101         svcpt = req->rq_rqbd->rqbd_svcpt;
3102         rs = req->rq_reply_state;
3103         if (rs == NULL || !rs->rs_difficult) {
3104                 /* no notifiers */
3105                 target_send_reply_msg(req, rc, fail_id);
3106                 EXIT;
3107                 return;
3108         }
3109
3110         /* must be an export if locks saved */
3111         LASSERT(req->rq_export != NULL);
3112         /* req/reply consistent */
3113         LASSERT(rs->rs_svcpt == svcpt);
3114
3115         /* "fresh" reply */
3116         LASSERT(!rs->rs_scheduled);
3117         LASSERT(!rs->rs_scheduled_ever);
3118         LASSERT(!rs->rs_handled);
3119         LASSERT(!rs->rs_on_net);
3120         LASSERT(rs->rs_export == NULL);
3121         LASSERT(list_empty(&rs->rs_obd_list));
3122         LASSERT(list_empty(&rs->rs_exp_list));
3123
3124         exp = class_export_get(req->rq_export);
3125
3126         /* disable reply scheduling while I'm setting up */
3127         rs->rs_scheduled = 1;
3128         rs->rs_on_net    = 1;
3129         rs->rs_xid       = req->rq_xid;
3130         rs->rs_transno   = req->rq_transno;
3131         rs->rs_export    = exp;
3132         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
3133
3134         spin_lock(&exp->exp_uncommitted_replies_lock);
3135         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
3136                rs->rs_transno, exp->exp_last_committed);
3137         if (rs->rs_transno > exp->exp_last_committed) {
3138                 /* not committed already */
3139                 list_add_tail(&rs->rs_obd_list,
3140                                   &exp->exp_uncommitted_replies);
3141         }
3142         spin_unlock(&exp->exp_uncommitted_replies_lock);
3143
3144         spin_lock(&exp->exp_lock);
3145         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
3146         spin_unlock(&exp->exp_lock);
3147
3148         netrc = target_send_reply_msg(req, rc, fail_id);
3149
3150         spin_lock(&svcpt->scp_rep_lock);
3151
3152         atomic_inc(&svcpt->scp_nreps_difficult);
3153
3154         if (netrc != 0) {
3155                 /*
3156                  * error sending: reply is off the net.  Also we need +1
3157                  * reply ref until ptlrpc_handle_rs() is done
3158                  * with the reply state (if the send was successful, there
3159                  * would have been +1 ref for the net, which
3160                  * reply_out_callback leaves alone)
3161                  */
3162                 rs->rs_on_net = 0;
3163                 ptlrpc_rs_addref(rs);
3164         }
3165
3166         spin_lock(&rs->rs_lock);
3167         if (rs->rs_transno <= exp->exp_last_committed ||
3168             (!rs->rs_on_net && !rs->rs_no_ack) ||
3169             list_empty(&rs->rs_exp_list) ||     /* completed already */
3170             list_empty(&rs->rs_obd_list)) {
3171                 CDEBUG(D_HA, "Schedule reply immediately\n");
3172                 ptlrpc_dispatch_difficult_reply(rs);
3173         } else {
3174                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
3175                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
3176         }
3177         spin_unlock(&rs->rs_lock);
3178         spin_unlock(&svcpt->scp_rep_lock);
3179         EXIT;
3180 }
3181
3182 enum ldlm_mode lck_compat_array[] = {
3183         [LCK_EX]    = LCK_COMPAT_EX,
3184         [LCK_PW]    = LCK_COMPAT_PW,
3185         [LCK_PR]    = LCK_COMPAT_PR,
3186         [LCK_CW]    = LCK_COMPAT_CW,
3187         [LCK_CR]    = LCK_COMPAT_CR,
3188         [LCK_NL]    = LCK_COMPAT_NL,
3189         [LCK_GROUP] = LCK_COMPAT_GROUP,
3190         [LCK_COS]   = LCK_COMPAT_COS,
3191 };
3192
3193 /**
3194  * Rather arbitrary mapping from LDLM error codes to errno values. This should
3195  * not escape to the user level.
3196  */
3197 int ldlm_error2errno(enum ldlm_error error)
3198 {
3199         int result;
3200
3201         switch (error) {
3202         case ELDLM_OK:
3203         case ELDLM_LOCK_MATCHED:
3204                 result = 0;
3205                 break;
3206         case ELDLM_LOCK_CHANGED:
3207                 result = -ESTALE;
3208                 break;
3209         case ELDLM_LOCK_ABORTED:
3210                 result = -ENAVAIL;
3211                 break;
3212         case ELDLM_LOCK_REPLACED:
3213                 result = -ESRCH;
3214                 break;
3215         case ELDLM_NO_LOCK_DATA:
3216                 result = -ENOENT;
3217                 break;
3218         case ELDLM_NAMESPACE_EXISTS:
3219                 result = -EEXIST;
3220                 break;
3221         case ELDLM_BAD_NAMESPACE:
3222                 result = -EBADF;
3223                 break;
3224         default:
3225                 if (((int)error) < 0) { /* cast to signed type */
3226                         result = error; /* as ldlm_error can be unsigned */
3227                 } else {
3228                         CERROR("Invalid DLM result code: %d\n", error);
3229                         result = -EPROTO;
3230                 }
3231         }
3232         return result;
3233 }
3234 EXPORT_SYMBOL(ldlm_error2errno);
3235
3236 /**
3237  * Dual to ldlm_error2errno(): maps errno values back to enum ldlm_error.
3238  */
3239 enum ldlm_error ldlm_errno2error(int err_no)
3240 {
3241         int error;
3242
3243         switch (err_no) {
3244         case 0:
3245                 error = ELDLM_OK;
3246                 break;
3247         case -ESTALE:
3248                 error = ELDLM_LOCK_CHANGED;
3249                 break;
3250         case -ENAVAIL:
3251                 error = ELDLM_LOCK_ABORTED;
3252                 break;
3253         case -ESRCH:
3254                 error = ELDLM_LOCK_REPLACED;
3255                 break;
3256         case -ENOENT:
3257                 error = ELDLM_NO_LOCK_DATA;
3258                 break;
3259         case -EEXIST:
3260                 error = ELDLM_NAMESPACE_EXISTS;
3261                 break;
3262         case -EBADF:
3263                 error = ELDLM_BAD_NAMESPACE;
3264                 break;
3265         default:
3266                 error = err_no;
3267         }
3268         return error;
3269 }
3270
3271 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3272 void ldlm_dump_export_locks(struct obd_export *exp)
3273 {
3274         spin_lock(&exp->exp_locks_list_guard);
3275         if (!list_empty(&exp->exp_locks_list)) {
3276                 struct ldlm_lock *lock;
3277
3278                 CERROR("dumping locks for export %p, ignore if the unmount doesn't hang\n",
3279                        exp);
3280                 list_for_each_entry(lock, &exp->exp_locks_list,
3281                                         l_exp_refs_link)
3282                         LDLM_ERROR(lock, "lock:");
3283         }
3284         spin_unlock(&exp->exp_locks_list_guard);
3285 }
3286 #endif
3287
3288 #ifdef HAVE_SERVER_SUPPORT
3289 static int target_bulk_timeout(void *data)
3290 {
3291         ENTRY;
3292         /*
3293          * We don't fail the connection here, because having the export
3294          * killed makes the (vital) call to commitrw very sad.
3295          */
3296         RETURN(1);
3297 }
3298
3299 static inline const char *bulk2type(struct ptlrpc_request *req)
3300 {
3301         if (req->rq_bulk_read)
3302                 return "READ";
3303         if (req->rq_bulk_write)
3304                 return "WRITE";
3305         return "UNKNOWN";
3306 }
3307
3308 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc,
3309                    struct l_wait_info *lwi)
3310 {
3311         struct ptlrpc_request *req = desc->bd_req;
3312         time64_t start = ktime_get_real_seconds();
3313         time64_t deadline;
3314         int rc = 0;
3315
3316         ENTRY;
3317
3318         /* If there is eviction in progress, wait for it to finish. */
3319         if (unlikely(atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
3320                 *lwi = LWI_INTR(NULL, NULL);
3321                 rc = l_wait_event(exp->exp_obd->obd_evict_inprogress_waitq,
3322                                   !atomic_read(&exp->exp_obd->obd_evict_inprogress),
3323                                   lwi);
3324         }
3325
3326         /* Check if client was evicted or reconnected already. */
3327         if (exp->exp_failed ||
3328             exp->exp_conn_cnt > lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3329                 rc = -ENOTCONN;
3330         } else {
3331                 if (req->rq_bulk_read)
3332                         rc = sptlrpc_svc_wrap_bulk(req, desc);
3333
3334                 if (OCD_HAS_FLAG(&exp->exp_connect_data, BULK_MBITS))
3335                         req->rq_mbits = lustre_msg_get_mbits(req->rq_reqmsg);
3336                 else /* old version, bulk matchbits is rq_xid */
3337                         req->rq_mbits = req->rq_xid;
3338
3339                 if (rc == 0)
3340                         rc = ptlrpc_start_bulk_transfer(desc);
3341         }
3342
3343         if (rc < 0) {
3344                 DEBUG_REQ(D_ERROR, req, "bulk %s failed: rc %d",
3345                           bulk2type(req), rc);
3346                 RETURN(rc);
3347         }
3348
3349         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
3350                 ptlrpc_abort_bulk(desc);
3351                 RETURN(0);
3352         }
3353
3354         /* limit actual bulk transfer to bulk_timeout seconds */
3355         deadline = start + bulk_timeout;
3356         if (deadline > req->rq_deadline)
3357                 deadline = req->rq_deadline;
3358
3359         do {
3360                 time64_t timeoutl = deadline - ktime_get_real_seconds();
3361                 long timeout_jiffies = timeoutl <= 0 ?
3362                                        1 : cfs_time_seconds(timeoutl);
3363                 time64_t rq_deadline;
3364
3365                 *lwi = LWI_TIMEOUT_INTERVAL(timeout_jiffies,
3366                                             cfs_time_seconds(1),
3367                                             target_bulk_timeout, desc);
3368                 rc = l_wait_event(desc->bd_waitq,
3369                                   !ptlrpc_server_bulk_active(desc) ||
3370                                   exp->exp_failed ||
3371                                   exp->exp_conn_cnt >
3372                                   lustre_msg_get_conn_cnt(req->rq_reqmsg),
3373                                   lwi);
3374                 LASSERT(rc == 0 || rc == -ETIMEDOUT);
3375                 /* Wait again if we changed rq_deadline. */
3376                 rq_deadline = READ_ONCE(req->rq_deadline);
3377                 deadline = start + bulk_timeout;
3378                 if (deadline > rq_deadline)
3379                         deadline = rq_deadline;
3380         } while (rc == -ETIMEDOUT &&
3381                  deadline > ktime_get_real_seconds());
3382
3383         if (rc == -ETIMEDOUT) {
3384                 DEBUG_REQ(D_ERROR, req, "timeout on bulk %s after %lld%+llds",
3385                           bulk2type(req), deadline - start,
3386                           ktime_get_real_seconds() - deadline);
3387                 ptlrpc_abort_bulk(desc);
3388         } else if (exp->exp_failed) {
3389                 DEBUG_REQ(D_ERROR, req, "Eviction on bulk %s",
3390                           bulk2type(req));
3391                 rc = -ENOTCONN;
3392                 ptlrpc_abort_bulk(desc);
3393         } else if (exp->exp_conn_cnt >
3394                    lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3395                 DEBUG_REQ(D_ERROR, req, "Reconnect on bulk %s",
3396                           bulk2type(req));
3397                 /* We don't reply anyway. */
3398                 rc = -ETIMEDOUT;
3399                 ptlrpc_abort_bulk(desc);
3400         } else if (desc->bd_failure) {
3401                 DEBUG_REQ(D_ERROR, req, "network error on bulk %s",
3402                           bulk2type(req));
3403                 /* XXX should this be a different errno? */
3404                 rc = -ETIMEDOUT;
3405         } else {
3406                 if (req->rq_bulk_write)
3407                         rc = sptlrpc_svc_unwrap_bulk(req, desc);
3408                 if (rc == 0 && desc->bd_nob_transferred != desc->bd_nob) {
3409                         DEBUG_REQ(D_ERROR, req, "truncated bulk %s %d(%d)",
3410                                   bulk2type(req), desc->bd_nob_transferred,
3411                                   desc->bd_nob);
3412                         /* XXX should this be a different errno? */
3413                         rc = -ETIMEDOUT;
3414                 }
3415         }
3416
3417         RETURN(rc);
3418 }
3419 EXPORT_SYMBOL(target_bulk_io);
3420
3421 #endif /* HAVE_SERVER_SUPPORT */