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  */
  31
  32 /**
  33  * This file deals with various client/target related logic including recovery.
  34  *
  35  * TODO: This code more logically belongs in the ptlrpc module than in ldlm and
  36  * should be moved.
  37  */
  38
  39 #define DEBUG_SUBSYSTEM S_LDLM
  40
  41 #include <cl_object.h>
  42 #include <linux/jiffies.h>
  43 #include <linux/kernel.h>
  44 #include <linux/kthread.h>
  45 #include <libcfs/libcfs.h>
  46 #include <obd.h>
  47 #include <obd_class.h>
  48 #include <lustre_dlm.h>
  49 #include <lustre_net.h>
  50 #include <lustre_sec.h>
  51 #include "ldlm_internal.h"
  52
  53 /*
  54  * @priority: If non-zero, move the selected connection to the list head.
  55  * @create: If zero, only search in existing connections.
  56  */
  57 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  58                            int priority, int create)
  59 {
  60         struct ptlrpc_connection *ptlrpc_conn;
  61         struct obd_import_conn *imp_conn = NULL, *item;
  62         lnet_nid_t nid4refnet = LNET_NID_ANY;
  63         int rc = 0;
  64
  65         ENTRY;
  66
  67         if (!create && !priority) {
  68                 CDEBUG(D_HA, "Nothing to do\n");
  69                 RETURN(-EINVAL);
  70         }
  71
  72         if (imp->imp_connection &&
  73             imp->imp_connection->c_remote_uuid.uuid[0] == 0)
  74                 /* nid4refnet is used to restrict network connections */
  75                 nid4refnet = imp->imp_connection->c_self;
  76         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, nid4refnet);
  77         if (!ptlrpc_conn) {
  78                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  79                 RETURN(-ENOENT);
  80         }
  81
  82         if (create) {
  83                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  84                 if (!imp_conn)
  85                         GOTO(out_put, rc = -ENOMEM);
  86         }
  87
  88         spin_lock(&imp->imp_lock);
  89         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  90                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  91                         if (priority) {
  92                                 list_move(&item->oic_item,
  93                                           &imp->imp_conn_list);
  94                                 item->oic_last_attempt = 0;
  95                         }
  96                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  97                                imp, imp->imp_obd->obd_name, uuid->uuid,
  98                                (priority ? ", moved to head" : ""));
  99                         spin_unlock(&imp->imp_lock);
 100                         GOTO(out_free, rc = 0);
 101                 }
 102         }
 103         /* No existing import connection found for \a uuid. */
 104         if (create) {
 105                 imp_conn->oic_conn = ptlrpc_conn;
 106                 imp_conn->oic_uuid = *uuid;
 107                 imp_conn->oic_last_attempt = 0;
 108                 if (priority)
 109                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 110                 else
 111                         list_add_tail(&imp_conn->oic_item,
 112                                       &imp->imp_conn_list);
 113                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 114                        imp, imp->imp_obd->obd_name, uuid->uuid,
 115                        (priority ? "head" : "tail"));
 116         } else {
 117                 spin_unlock(&imp->imp_lock);
 118                 GOTO(out_free, rc = -ENOENT);
 119         }
 120
 121         spin_unlock(&imp->imp_lock);
 122         RETURN(0);
 123 out_free:
 124         if (imp_conn)
 125                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 126 out_put:
 127         ptlrpc_connection_put(ptlrpc_conn);
 128         RETURN(rc);
 129 }
 130
 131 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 132 {
 133         return import_set_conn(imp, uuid, 1, 0);
 134 }
 135
 136 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 137                            int priority)
 138 {
 139         return import_set_conn(imp, uuid, priority, 1);
 140 }
 141 EXPORT_SYMBOL(client_import_add_conn);
 142
 143 int client_import_dyn_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 144                                lnet_nid_t prim_nid, int priority)
 145 {
 146         struct ptlrpc_connection *ptlrpc_conn;
 147         int rc;
 148
 149         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, prim_nid);
 150         if (!ptlrpc_conn) {
 151                 const char *str_uuid = obd_uuid2str(uuid);
 152
 153                 rc = class_add_uuid(str_uuid, prim_nid);
 154                 if (rc) {
 155                         CERROR("%s: failed to add UUID '%s': rc = %d\n",
 156                                imp->imp_obd->obd_name, str_uuid, rc);
 157                         return rc;
 158                 }
 159         }
 160         return import_set_conn(imp, uuid, priority, 1);
 161 }
 162 EXPORT_SYMBOL(client_import_dyn_add_conn);
 163
 164 int client_import_add_nids_to_conn(struct obd_import *imp, lnet_nid_t *nids,
 165                                    int nid_count, struct obd_uuid *uuid)
 166 {
 167         struct obd_import_conn *conn;
 168         int rc = -ENOENT;
 169
 170         ENTRY;
 171         if (nid_count <= 0 || !nids)
 172                 return rc;
 173
 174         spin_lock(&imp->imp_lock);
 175         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 176                 if (class_check_uuid(&conn->oic_uuid, nids[0])) {
 177                         *uuid = conn->oic_uuid;
 178                         rc = class_add_nids_to_uuid(&conn->oic_uuid, nids,
 179                                                     nid_count);
 180                         break;
 181                 }
 182         }
 183         spin_unlock(&imp->imp_lock);
 184         RETURN(rc);
 185 }
 186 EXPORT_SYMBOL(client_import_add_nids_to_conn);
 187
 188 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 189 {
 190         struct obd_import_conn *imp_conn;
 191         struct obd_export *dlmexp;
 192         int rc = -ENOENT;
 193
 194         ENTRY;
 195
 196         spin_lock(&imp->imp_lock);
 197         if (list_empty(&imp->imp_conn_list)) {
 198                 LASSERT(!imp->imp_connection);
 199                 GOTO(out, rc);
 200         }
 201
 202         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 203                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 204                         continue;
 205                 LASSERT(imp_conn->oic_conn);
 206
 207                 if (imp_conn == imp->imp_conn_current) {
 208                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 209
 210                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 211                             imp->imp_state != LUSTRE_IMP_DISCON) {
 212                                 CERROR("can't remove current connection\n");
 213                                 GOTO(out, rc = -EBUSY);
 214                         }
 215
 216                         ptlrpc_connection_put(imp->imp_connection);
 217                         imp->imp_connection = NULL;
 218
 219                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 220                         if (dlmexp && dlmexp->exp_connection) {
 221                                 LASSERT(dlmexp->exp_connection ==
 222                                         imp_conn->oic_conn);
 223                                 ptlrpc_connection_put(dlmexp->exp_connection);
 224                                 dlmexp->exp_connection = NULL;
 225                         }
 226
 227                         if (dlmexp != NULL)
 228                                 class_export_put(dlmexp);
 229                 }
 230
 231                 list_del(&imp_conn->oic_item);
 232                 ptlrpc_connection_put(imp_conn->oic_conn);
 233                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 234                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 235                        imp, imp->imp_obd->obd_name, uuid->uuid);
 236                 rc = 0;
 237                 break;
 238         }
 239 out:
 240         spin_unlock(&imp->imp_lock);
 241         if (rc == -ENOENT)
 242                 CERROR("connection %s not found\n", uuid->uuid);
 243         RETURN(rc);
 244 }
 245 EXPORT_SYMBOL(client_import_del_conn);
 246
 247 /**
 248  * Find conn UUID by peer NID. \a peer is a server NID. This function is used
 249  * to find a conn uuid of \a imp which can reach \a peer.
 250  */
 251 int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
 252                             struct obd_uuid *uuid)
 253 {
 254         struct obd_import_conn *conn;
 255         int rc = -ENOENT;
 256
 257         ENTRY;
 258
 259         spin_lock(&imp->imp_lock);
 260         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 261                 /* Check if conn UUID does have this peer NID. */
 262                 if (class_check_uuid(&conn->oic_uuid, peer)) {
 263                         *uuid = conn->oic_uuid;
 264                         rc = 0;
 265                         break;
 266                 }
 267         }
 268         spin_unlock(&imp->imp_lock);
 269         RETURN(rc);
 270 }
 271 EXPORT_SYMBOL(client_import_find_conn);
 272
 273 void client_destroy_import(struct obd_import *imp)
 274 {
 275         /*
 276          * Drop security policy instance after all RPCs have finished/aborted
 277          * to let all busy contexts be released.
 278          */
 279         class_import_get(imp);
 280         class_destroy_import(imp);
 281         sptlrpc_import_sec_put(imp);
 282         class_import_put(imp);
 283 }
 284 EXPORT_SYMBOL(client_destroy_import);
 285
 286 /**
 287  * Check whether or not the OSC is on MDT.
 288  * In the config log,
 289  * osc on MDT
 290  *      setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
 291  * osc on client
 292  *      setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
 293  *
 294  **/
 295 static int osc_on_mdt(char *obdname)
 296 {
 297         char *ptr;
 298
 299         ptr = strrchr(obdname, '-');
 300         if (ptr == NULL)
 301                 return 0;
 302
 303         if (strncmp(ptr + 1, "MDT", 3) == 0)
 304                 return 1;
 305
 306         return 0;
 307 }
 308
 309 /*
 310  * Configure an RPC client OBD device.
 311  *
 312  * lcfg parameters:
 313  * 1 - client UUID
 314  * 2 - server UUID
 315  * 3 - inactive-on-startup
 316  * 4 - restrictive net
 317  */
 318 int client_obd_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 319 {
 320         struct client_obd *cli = &obd->u.cli;
 321         struct obd_import *imp;
 322         struct obd_uuid server_uuid;
 323         int rq_portal, rp_portal, connect_op;
 324         const char *name = obd->obd_type->typ_name;
 325         enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
 326         char *cli_name = lustre_cfg_buf(lcfg, 0);
 327         struct ptlrpc_connection fake_conn = { .c_self = 0,
 328                                                .c_remote_uuid.uuid[0] = 0 };
 329         int rc;
 330
 331         ENTRY;
 332
 333         /*
 334          * In a more perfect world, we would hang a ptlrpc_client off of
 335          * obd_type and just use the values from there.
 336          */
 337         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 338                 rq_portal = OST_REQUEST_PORTAL;
 339                 rp_portal = OSC_REPLY_PORTAL;
 340                 connect_op = OST_CONNECT;
 341                 cli->cl_sp_me = LUSTRE_SP_CLI;
 342                 cli->cl_sp_to = LUSTRE_SP_OST;
 343                 ns_type = LDLM_NS_TYPE_OSC;
 344         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
 345                    !strcmp(name, LUSTRE_LWP_NAME)) {
 346                 rq_portal = MDS_REQUEST_PORTAL;
 347                 rp_portal = MDC_REPLY_PORTAL;
 348                 connect_op = MDS_CONNECT;
 349                 if (is_lwp_on_ost(cli_name))
 350                         cli->cl_sp_me = LUSTRE_SP_OST;
 351                 else if (is_lwp_on_mdt(cli_name))
 352                         cli->cl_sp_me = LUSTRE_SP_MDT;
 353                 else
 354                         cli->cl_sp_me = LUSTRE_SP_CLI;
 355                 cli->cl_sp_to = LUSTRE_SP_MDT;
 356                 ns_type = LDLM_NS_TYPE_MDC;
 357         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
 358                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
 359                         /* OSP_on_MDT for other MDTs */
 360                         connect_op = MDS_CONNECT;
 361                         cli->cl_sp_to = LUSTRE_SP_MDT;
 362                         ns_type = LDLM_NS_TYPE_MDC;
 363                         rq_portal = OUT_PORTAL;
 364                 } else {
 365                         /* OSP on MDT for OST */
 366                         connect_op = OST_CONNECT;
 367                         cli->cl_sp_to = LUSTRE_SP_OST;
 368                         ns_type = LDLM_NS_TYPE_OSC;
 369                         rq_portal = OST_REQUEST_PORTAL;
 370                 }
 371                 rp_portal = OSC_REPLY_PORTAL;
 372                 cli->cl_sp_me = LUSTRE_SP_MDT;
 373         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 374                 rq_portal = MGS_REQUEST_PORTAL;
 375                 rp_portal = MGC_REPLY_PORTAL;
 376                 connect_op = MGS_CONNECT;
 377                 cli->cl_sp_me = LUSTRE_SP_MGC;
 378                 cli->cl_sp_to = LUSTRE_SP_MGS;
 379                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 380                 ns_type = LDLM_NS_TYPE_MGC;
 381         } else {
 382                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 383                        name);
 384                 RETURN(-EINVAL);
 385         }
 386
 387         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 388                 CERROR("requires a TARGET UUID\n");
 389                 RETURN(-EINVAL);
 390         }
 391
 392         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 393                 CERROR("client UUID must be less than 38 characters\n");
 394                 RETURN(-EINVAL);
 395         }
 396
 397         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 398                 CERROR("setup requires a SERVER UUID\n");
 399                 RETURN(-EINVAL);
 400         }
 401
 402         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 403                 CERROR("target UUID must be less than 38 characters\n");
 404                 RETURN(-EINVAL);
 405         }
 406
 407         init_rwsem(&cli->cl_sem);
 408         mutex_init(&cli->cl_mgc_mutex);
 409         cli->cl_seq = NULL;
 410         init_rwsem(&cli->cl_seq_rwsem);
 411         cli->cl_conn_count = 0;
 412         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 413                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 414                      sizeof(server_uuid)));
 415
 416         cli->cl_dirty_pages = 0;
 417         cli->cl_dirty_max_pages = 0;
 418         cli->cl_avail_grant = 0;
 419         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
 420         /*
 421          * cl_dirty_max_pages may be changed at connect time in
 422          * ptlrpc_connect_interpret().
 423          */
 424         client_adjust_max_dirty(cli);
 425         init_waitqueue_head(&cli->cl_cache_waiters);
 426         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 427         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 428         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 429         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 430         spin_lock_init(&cli->cl_loi_list_lock);
 431         atomic_set(&cli->cl_pending_w_pages, 0);
 432         atomic_set(&cli->cl_pending_r_pages, 0);
 433         cli->cl_r_in_flight = 0;
 434         cli->cl_w_in_flight = 0;
 435
 436         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 437         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 438         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 439         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 440         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 441         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 442
 443         /* lru for osc. */
 444         INIT_LIST_HEAD(&cli->cl_lru_osc);
 445         atomic_set(&cli->cl_lru_shrinkers, 0);
 446         atomic_long_set(&cli->cl_lru_busy, 0);
 447         atomic_long_set(&cli->cl_lru_in_list, 0);
 448         INIT_LIST_HEAD(&cli->cl_lru_list);
 449         spin_lock_init(&cli->cl_lru_list_lock);
 450         atomic_long_set(&cli->cl_unstable_count, 0);
 451         INIT_LIST_HEAD(&cli->cl_shrink_list);
 452         INIT_LIST_HEAD(&cli->cl_grant_chain);
 453
 454         INIT_LIST_HEAD(&cli->cl_flight_waiters);
 455         cli->cl_rpcs_in_flight = 0;
 456
 457         init_waitqueue_head(&cli->cl_destroy_waitq);
 458         atomic_set(&cli->cl_destroy_in_flight, 0);
 459
 460
 461         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 462         cli->cl_preferred_cksum_type = 0;
 463 #ifdef ENABLE_CHECKSUM
 464         /* Turn on checksumming by default. */
 465         cli->cl_checksum = 1;
 466         /*
 467          * The supported checksum types will be worked out at connect time
 468          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 469          * through procfs.
 470          */
 471         cli->cl_cksum_type = cli->cl_supp_cksum_types;
 472 #endif
 473         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 474
 475         /*
 476          * Set it to possible maximum size. It may be reduced by ocd_brw_size
 477          * from OFD after connecting.
 478          */
 479         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 480
 481         cli->cl_max_short_io_bytes = OBD_DEF_SHORT_IO_BYTES;
 482
 483         /*
 484          * set cl_chunkbits default value to PAGE_SHIFT,
 485          * it will be updated at OSC connection time.
 486          */
 487         cli->cl_chunkbits = PAGE_SHIFT;
 488
 489         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 490                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 491         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
 492                 cli->cl_max_rpcs_in_flight = 2;
 493         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
 494                 cli->cl_max_rpcs_in_flight = 3;
 495         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
 496                 cli->cl_max_rpcs_in_flight = 4;
 497         } else {
 498                 if (osc_on_mdt(obd->obd_name))
 499                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
 500                 else
 501                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 502         }
 503
 504         spin_lock_init(&cli->cl_mod_rpcs_lock);
 505         spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
 506         cli->cl_max_mod_rpcs_in_flight = 0;
 507         cli->cl_mod_rpcs_in_flight = 0;
 508         cli->cl_close_rpcs_in_flight = 0;
 509         init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
 510         cli->cl_mod_tag_bitmap = NULL;
 511
 512         INIT_LIST_HEAD(&cli->cl_chg_dev_linkage);
 513
 514         if (connect_op == MDS_CONNECT) {
 515                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
 516                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
 517                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 518                 if (cli->cl_mod_tag_bitmap == NULL)
 519                         GOTO(err, rc = -ENOMEM);
 520         }
 521
 522         rc = ldlm_get_ref();
 523         if (rc) {
 524                 CERROR("ldlm_get_ref failed: %d\n", rc);
 525                 GOTO(err, rc);
 526         }
 527
 528         ptlrpc_init_client(rq_portal, rp_portal, name,
 529                            &obd->obd_ldlm_client);
 530
 531         imp = class_new_import(obd);
 532         if (imp == NULL)
 533                 GOTO(err_ldlm, rc = -ENOENT);
 534         imp->imp_client = &obd->obd_ldlm_client;
 535         imp->imp_connect_op = connect_op;
 536         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 537                LUSTRE_CFG_BUFLEN(lcfg, 1));
 538         class_import_put(imp);
 539
 540         if (lustre_cfg_buf(lcfg, 4)) {
 541                 __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
 542
 543                 if (refnet == LNET_NET_ANY) {
 544                         rc = -EINVAL;
 545                         CERROR("%s: bad mount option 'network=%s': rc = %d\n",
 546                                obd->obd_name, lustre_cfg_string(lcfg, 4),
 547                                rc);
 548                         GOTO(err_import, rc);
 549                 }
 550                 fake_conn.c_self = LNET_MKNID(refnet, 0);
 551                 imp->imp_connection = &fake_conn;
 552         }
 553
 554         rc = client_import_add_conn(imp, &server_uuid, 1);
 555         if (rc) {
 556                 CERROR("can't add initial connection\n");
 557                 GOTO(err_import, rc);
 558         }
 559         imp->imp_connection = NULL;
 560
 561         cli->cl_import = imp;
 562         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
 563         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 564
 565         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 566                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 567                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 568                                name, obd->obd_name,
 569                                cli->cl_target_uuid.uuid);
 570                         spin_lock(&imp->imp_lock);
 571                         imp->imp_deactive = 1;
 572                         spin_unlock(&imp->imp_lock);
 573                 }
 574         }
 575
 576         obd->obd_namespace = ldlm_namespace_new(obd, obd->obd_name,
 577                                                 LDLM_NAMESPACE_CLIENT,
 578                                                 LDLM_NAMESPACE_GREEDY,
 579                                                 ns_type);
 580         if (IS_ERR(obd->obd_namespace)) {
 581                 rc = PTR_ERR(obd->obd_namespace);
 582                 CERROR("%s: unable to create client namespace: rc = %d\n",
 583                        obd->obd_name, rc);
 584                 obd->obd_namespace = NULL;
 585                 GOTO(err_import, rc);
 586         }
 587
 588         RETURN(rc);
 589
 590 err_import:
 591         class_destroy_import(imp);
 592 err_ldlm:
 593         ldlm_put_ref();
 594 err:
 595         if (cli->cl_mod_tag_bitmap != NULL)
 596                 OBD_FREE(cli->cl_mod_tag_bitmap,
 597                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 598         cli->cl_mod_tag_bitmap = NULL;
 599
 600         RETURN(rc);
 601 }
 602 EXPORT_SYMBOL(client_obd_setup);
 603
 604 int client_obd_cleanup(struct obd_device *obd)
 605 {
 606         struct client_obd *cli = &obd->u.cli;
 607
 608         ENTRY;
 609
 610         ldlm_namespace_free_post(obd->obd_namespace);
 611         obd->obd_namespace = NULL;
 612
 613         obd_cleanup_client_import(obd);
 614         LASSERT(obd->u.cli.cl_import == NULL);
 615
 616         ldlm_put_ref();
 617
 618         if (cli->cl_mod_tag_bitmap != NULL)
 619                 OBD_FREE(cli->cl_mod_tag_bitmap,
 620                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 621         cli->cl_mod_tag_bitmap = NULL;
 622
 623         RETURN(0);
 624 }
 625 EXPORT_SYMBOL(client_obd_cleanup);
 626
 627 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 628 int client_connect_import(const struct lu_env *env,
 629                           struct obd_export **exp,
 630                           struct obd_device *obd, struct obd_uuid *cluuid,
 631                           struct obd_connect_data *data, void *localdata)
 632 {
 633         struct client_obd *cli = &obd->u.cli;
 634         struct obd_import *imp = cli->cl_import;
 635         struct obd_connect_data *ocd;
 636         struct lustre_handle conn = { 0 };
 637         int rc;
 638
 639         ENTRY;
 640
 641         *exp = NULL;
 642         down_write(&cli->cl_sem);
 643         if (cli->cl_conn_count > 0)
 644                 GOTO(out_sem, rc = -EALREADY);
 645
 646         rc = class_connect(&conn, obd, cluuid);
 647         if (rc)
 648                 GOTO(out_sem, rc);
 649
 650         cli->cl_conn_count++;
 651         *exp = class_conn2export(&conn);
 652
 653         LASSERT(obd->obd_namespace);
 654
 655         imp->imp_dlm_handle = conn;
 656         rc = ptlrpc_init_import(imp);
 657         if (rc != 0)
 658                 GOTO(out_ldlm, rc);
 659
 660         ocd = &imp->imp_connect_data;
 661         if (data) {
 662                 *ocd = *data;
 663                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 664                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
 665         }
 666
 667         rc = ptlrpc_connect_import(imp);
 668         if (rc != 0) {
 669                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 670                 GOTO(out_ldlm, rc);
 671         }
 672         LASSERT(*exp != NULL && (*exp)->exp_connection);
 673
 674         if (data) {
 675                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 676                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 677                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 678                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 679                 data->ocd_connect_flags2 = ocd->ocd_connect_flags2;
 680         }
 681
 682         ptlrpc_pinger_add_import(imp);
 683
 684         EXIT;
 685
 686         if (rc) {
 687 out_ldlm:
 688                 cli->cl_conn_count--;
 689                 class_disconnect(*exp);
 690                 *exp = NULL;
 691         }
 692 out_sem:
 693         up_write(&cli->cl_sem);
 694
 695         if (!rc && localdata) {
 696                 LASSERT(cli->cl_cache == NULL); /* only once */
 697                 cli->cl_cache = (struct cl_client_cache *)localdata;
 698                 cl_cache_incref(cli->cl_cache);
 699                 cli->cl_lru_left = &cli->cl_cache->ccc_lru_left;
 700
 701                 /* add this osc into entity list */
 702                 LASSERT(list_empty(&cli->cl_lru_osc));
 703                 spin_lock(&cli->cl_cache->ccc_lru_lock);
 704                 list_add(&cli->cl_lru_osc, &cli->cl_cache->ccc_lru);
 705                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
 706         }
 707
 708         return rc;
 709 }
 710 EXPORT_SYMBOL(client_connect_import);
 711
 712 int client_disconnect_export(struct obd_export *exp)
 713 {
 714         struct obd_device *obd = class_exp2obd(exp);
 715         struct client_obd *cli;
 716         struct obd_import *imp;
 717         int rc = 0, err;
 718
 719         ENTRY;
 720
 721         if (!obd) {
 722                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 723                        exp, exp ? exp->exp_handle.h_cookie : -1);
 724                 RETURN(-EINVAL);
 725         }
 726
 727         cli = &obd->u.cli;
 728         imp = cli->cl_import;
 729
 730         down_write(&cli->cl_sem);
 731         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
 732                 cli->cl_conn_count);
 733
 734         if (cli->cl_conn_count == 0) {
 735                 CERROR("disconnecting disconnected device (%s)\n",
 736                        obd->obd_name);
 737                 GOTO(out_disconnect, rc = -EINVAL);
 738         }
 739
 740         cli->cl_conn_count--;
 741         if (cli->cl_conn_count != 0)
 742                 GOTO(out_disconnect, rc = 0);
 743
 744         /*
 745          * Mark import deactivated now, so we don't try to reconnect if any
 746          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 747          * fully deactivate the import, or that would drop all requests.
 748          */
 749         spin_lock(&imp->imp_lock);
 750         imp->imp_deactive = 1;
 751         spin_unlock(&imp->imp_lock);
 752
 753         /*
 754          * Some non-replayable imports (MDS's OSCs) are pinged, so just
 755          * delete it regardless.  (It's safe to delete an import that was
 756          * never added.)
 757          */
 758         (void)ptlrpc_pinger_del_import(imp);
 759
 760         if (obd->obd_namespace != NULL) {
 761                 /* obd_force == local only */
 762                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 763                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 764                 ldlm_namespace_free_prior(obd->obd_namespace, imp,
 765                                           obd->obd_force);
 766         }
 767
 768         /*
 769          * There's no need to hold sem while disconnecting an import,
 770          * and it may actually cause deadlock in GSS.
 771          */
 772         up_write(&cli->cl_sem);
 773         rc = ptlrpc_disconnect_import(imp, 0);
 774         down_write(&cli->cl_sem);
 775
 776         ptlrpc_invalidate_import(imp);
 777
 778         EXIT;
 779
 780 out_disconnect:
 781         /*
 782          * Use server style - class_disconnect should be always called for
 783          * o_disconnect.
 784          */
 785         err = class_disconnect(exp);
 786         if (!rc && err)
 787                 rc = err;
 788
 789         up_write(&cli->cl_sem);
 790
 791         RETURN(rc);
 792 }
 793 EXPORT_SYMBOL(client_disconnect_export);
 794
 795 #ifdef HAVE_SERVER_SUPPORT
 796 int server_disconnect_export(struct obd_export *exp)
 797 {
 798         int rc;
 799
 800         ENTRY;
 801
 802         /* Disconnect early so that clients can't keep using export. */
 803         rc = class_disconnect(exp);
 804         /* Close import to avoid sending any requests. */
 805         if (exp->exp_imp_reverse)
 806                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 807
 808         ldlm_bl_thread_wakeup();
 809
 810         /* complete all outstanding replies */
 811         spin_lock(&exp->exp_lock);
 812         while (!list_empty(&exp->exp_outstanding_replies)) {
 813                 struct ptlrpc_reply_state *rs =
 814                         list_entry(exp->exp_outstanding_replies.next,
 815                                        struct ptlrpc_reply_state, rs_exp_list);
 816                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 817
 818                 spin_lock(&svcpt->scp_rep_lock);
 819
 820                 list_del_init(&rs->rs_exp_list);
 821
 822                 spin_lock(&rs->rs_lock);
 823                 /* clear rs_convert_lock to make sure rs is handled and put */
 824                 rs->rs_convert_lock = 0;
 825                 ptlrpc_schedule_difficult_reply(rs);
 826                 spin_unlock(&rs->rs_lock);
 827
 828                 spin_unlock(&svcpt->scp_rep_lock);
 829         }
 830         spin_unlock(&exp->exp_lock);
 831
 832         RETURN(rc);
 833 }
 834 EXPORT_SYMBOL(server_disconnect_export);
 835
 836 static inline int target_check_recovery_timer(struct obd_device *target)
 837 {
 838         ktime_t remaining;
 839         s64 timeout;
 840
 841         if (!target->obd_recovering || target->obd_recovery_start == 0)
 842                 return 0;
 843
 844         remaining = hrtimer_get_remaining(&target->obd_recovery_timer);
 845         timeout = ktime_divns(remaining, NSEC_PER_SEC);
 846         if (timeout > -30)
 847                 return 0;
 848
 849         /* the recovery timer should expire, but it isn't triggered,
 850          * it's better to abort the recovery of this target to speed up
 851          * the recovery of the whole cluster. */
 852         spin_lock(&target->obd_dev_lock);
 853         if (target->obd_recovering) {
 854                 CERROR("%s: Aborting recovery\n", target->obd_name);
 855                 target->obd_abort_recovery = 1;
 856                 wake_up(&target->obd_next_transno_waitq);
 857         }
 858         spin_unlock(&target->obd_dev_lock);
 859         return 0;
 860 }
 861
 862 /*
 863  * --------------------------------------------------------------------------
 864  * from old lib/target.c
 865  * --------------------------------------------------------------------------
 866  */
 867 static int target_handle_reconnect(struct lustre_handle *conn,
 868                                    struct obd_export *exp,
 869                                    struct obd_uuid *cluuid)
 870 {
 871         struct obd_device *target;
 872         struct lustre_handle *hdl;
 873         ktime_t remaining;
 874         s64 timeout;
 875         int rc = 0;
 876
 877         ENTRY;
 878         hdl = &exp->exp_imp_reverse->imp_remote_handle;
 879         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
 880                 conn->cookie = exp->exp_handle.h_cookie;
 881                 CDEBUG(D_HA,
 882                        "connect export for UUID '%s' at %p, cookie %#llx\n",
 883                        cluuid->uuid, exp, conn->cookie);
 884                 RETURN(0);
 885         }
 886
 887         target = exp->exp_obd;
 888
 889         /* Might be a re-connect after a partition. */
 890         if (memcmp(&conn->cookie, &hdl->cookie, sizeof(conn->cookie))) {
 891                 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",
 892                               target->obd_name,
 893                               obd_uuid2str(&exp->exp_client_uuid),
 894                               obd_export_nid2str(exp),
 895                               hdl->cookie, conn->cookie);
 896                 memset(conn, 0, sizeof(*conn));
 897                 /*
 898                  * target_handle_connect() treats EALREADY and
 899                  * -EALREADY differently.  -EALREADY is an error
 900                  * (same UUID, different handle).
 901                  */
 902                 RETURN(-EALREADY);
 903         }
 904
 905         if (!target->obd_recovering) {
 906                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
 907                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
 908                         obd_export_nid2str(exp));
 909                 GOTO(out_already, rc);
 910         }
 911
 912         remaining = hrtimer_get_remaining(&target->obd_recovery_timer);
 913         timeout = ktime_divns(remaining, NSEC_PER_SEC);
 914         if (timeout > 0) {
 915                 LCONSOLE_WARN("%s: Client %s (at %s) reconnected, waiting for %d clients in recovery for %lld:%.02lld\n",
 916                               target->obd_name,
 917                               obd_uuid2str(&exp->exp_client_uuid),
 918                               obd_export_nid2str(exp),
 919                               atomic_read(&target->obd_max_recoverable_clients),
 920                               timeout / 60, timeout % 60);
 921         } else {
 922                 struct target_distribute_txn_data *tdtd;
 923                 int size = 0;
 924                 int count = 0;
 925                 char *buf = NULL;
 926
 927                 target_check_recovery_timer(target);
 928
 929                 tdtd = class_exp2tgt(exp)->lut_tdtd;
 930                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
 931                         buf = tdtd->tdtd_show_update_logs_retrievers(
 932                                 tdtd->tdtd_show_retrievers_cbdata,
 933                                 &size, &count);
 934
 935                 if (count > 0)
 936                         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",
 937                                       target->obd_name,
 938                                       obd_uuid2str(&exp->exp_client_uuid),
 939                                       obd_export_nid2str(exp), count,
 940                                       buf ? buf : "unknown (not enough RAM)",
 941                                       (abs(timeout) + target->obd_recovery_timeout) / 60,
 942                                       (abs(timeout) + target->obd_recovery_timeout) % 60,
 943                                       target->obd_name);
 944                 else
 945                         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",
 946                                       target->obd_name, abs(timeout) / 60,
 947                                       abs(timeout) % 60, target->obd_name);
 948
 949                 if (buf != NULL)
 950                         OBD_FREE(buf, size);
 951         }
 952
 953 out_already:
 954         conn->cookie = exp->exp_handle.h_cookie;
 955         /*
 956          * target_handle_connect() treats EALREADY and
 957          * -EALREADY differently.  EALREADY means we are
 958          * doing a valid reconnect from the same client.
 959          */
 960         RETURN(EALREADY);
 961 }
 962
 963 static void
 964 check_and_start_recovery_timer(struct obd_device *obd,
 965                                struct ptlrpc_request *req, int new_client);
 966
 967 /**
 968  * update flags for import during reconnect process
 969  */
 970 static int rev_import_flags_update(struct obd_import *revimp,
 971                                    struct ptlrpc_request *req)
 972 {
 973         int rc;
 974         struct obd_connect_data *data;
 975
 976         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 977
 978         if (data->ocd_connect_flags & OBD_CONNECT_AT)
 979                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 980         else
 981                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 982
 983         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
 984
 985         revimp->imp_connect_data = *data;
 986         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
 987         if (rc) {
 988                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
 989                         revimp->imp_client->cli_name,
 990                         libcfs_id2str(req->rq_peer), rc);
 991                 return rc;
 992         }
 993
 994         return 0;
 995 }
 996
 997 /**
 998  * Allocate a new reverse import for an export.
 999  *
1000  * \retval -errno in case error hit
1001  * \retval 0 if reverse import correctly init
1002  **/
1003 int rev_import_init(struct obd_export *export)
1004 {
1005         struct obd_device *obd = export->exp_obd;
1006         struct obd_import *revimp;
1007
1008         LASSERT(export->exp_imp_reverse == NULL);
1009
1010         revimp = class_new_import(obd);
1011         if (revimp == NULL)
1012                 return -ENOMEM;
1013
1014         revimp->imp_remote_handle.cookie = 0ULL;
1015         revimp->imp_client = &obd->obd_ldlm_client;
1016         revimp->imp_dlm_fake = 1;
1017
1018         /* it is safe to connect import in new state as no sends possible */
1019         spin_lock(&export->exp_lock);
1020         export->exp_imp_reverse = revimp;
1021         spin_unlock(&export->exp_lock);
1022         class_import_put(revimp);
1023
1024         return 0;
1025 }
1026 EXPORT_SYMBOL(rev_import_init);
1027
1028 /**
1029  * Handle reconnect for an export.
1030  *
1031  * \param exp export to handle reconnect process
1032  * \param req client reconnect request
1033  *
1034  * \retval -rc in case securitfy flavor can't be changed
1035  * \retval 0 in case none problems
1036  */
1037 static int rev_import_reconnect(struct obd_export *exp,
1038                                 struct ptlrpc_request *req)
1039 {
1040         struct obd_import *revimp = exp->exp_imp_reverse;
1041         struct lustre_handle *lh;
1042         int rc;
1043
1044         /* avoid sending a request until import flags are changed */
1045         ptlrpc_import_enter_resend(revimp);
1046
1047         ptlrpc_connection_put(revimp->imp_connection);
1048
1049         /*
1050          * client from recovery don't have a handle so we need to take from
1051          * request. it may produce situation when wrong client connected
1052          * to recovery as we trust a client uuid
1053          */
1054         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1055         revimp->imp_remote_handle = *lh;
1056
1057         /*
1058          * unknown versions will be caught in
1059          * ptlrpc_handle_server_req_in->lustre_unpack_msg()
1060          */
1061         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1062
1063         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
1064
1065         rc = rev_import_flags_update(revimp, req);
1066         if (rc != 0) {
1067                 /*
1068                  * it is safe to still be in RECOVERY phase as we are not able
1069                  * to setup correct security flavor so requests are not able to
1070                  * be delivered correctly
1071                  */
1072                 return rc;
1073         }
1074
1075         /* resend all rpc's via new connection */
1076         return ptlrpc_import_recovery_state_machine(revimp);
1077 }
1078
1079 int target_handle_connect(struct ptlrpc_request *req)
1080 {
1081         struct obd_device *target = NULL;
1082         struct obd_export *export = NULL;
1083         /*
1084          * connect handle - filled from target_handle_reconnect in
1085          * reconnect case
1086          */
1087         struct lustre_handle conn;
1088         struct lustre_handle *tmp;
1089         struct obd_uuid cluuid;
1090         char *str;
1091         int rc = 0;
1092         char *target_start;
1093         int target_len;
1094         bool mds_conn = false, lw_client = false, initial_conn = false;
1095         bool mds_mds_conn = false;
1096         bool new_mds_mds_conn = false;
1097         struct obd_connect_data *data, *tmpdata;
1098         int size, tmpsize;
1099         lnet_nid_t *client_nid = NULL;
1100         struct ptlrpc_connection *pcon = NULL;
1101
1102         ENTRY;
1103
1104         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
1105
1106         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
1107         if (str == NULL) {
1108                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
1109                 GOTO(out, rc = -EINVAL);
1110         }
1111
1112         target = class_dev_by_str(str);
1113         if (!target) {
1114                 deuuidify(str, NULL, &target_start, &target_len);
1115                 LCONSOLE_ERROR_MSG(0x137,
1116                                    "%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",
1117                                    str, libcfs_nid2str(req->rq_peer.nid));
1118                 GOTO(out, rc = -ENODEV);
1119         }
1120
1121         spin_lock(&target->obd_dev_lock);
1122
1123         target->obd_conn_inprogress++;
1124
1125         if (target->obd_stopping || !target->obd_set_up) {
1126                 spin_unlock(&target->obd_dev_lock);
1127
1128                 deuuidify(str, NULL, &target_start, &target_len);
1129                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
1130                               target_len, target_start,
1131                               libcfs_nid2str(req->rq_peer.nid),
1132                               (target->obd_stopping ?
1133                                "stopping" : "not set up"));
1134                 GOTO(out, rc = -ENODEV);
1135         }
1136
1137         if (target->obd_no_conn) {
1138                 spin_unlock(&target->obd_dev_lock);
1139
1140                 CDEBUG(D_INFO,
1141                        "%s: Temporarily refusing client connection from %s\n",
1142                        target->obd_name, libcfs_nid2str(req->rq_peer.nid));
1143                 GOTO(out, rc = -EAGAIN);
1144         }
1145
1146         spin_unlock(&target->obd_dev_lock);
1147
1148         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1149         if (str == NULL) {
1150                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1151                 GOTO(out, rc = -EINVAL);
1152         }
1153
1154         obd_str2uuid(&cluuid, str);
1155
1156         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1157         if (tmp == NULL)
1158                 GOTO(out, rc = -EPROTO);
1159
1160         conn = *tmp;
1161
1162         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1163                                     RCL_CLIENT);
1164         if (size < 0 || size > 8 * sizeof(struct obd_connect_data))
1165                 GOTO(out, rc = -EPROTO);
1166         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1167         if (!data)
1168                 GOTO(out, rc = -EPROTO);
1169
1170         rc = req_capsule_server_pack(&req->rq_pill);
1171         if (rc)
1172                 GOTO(out, rc);
1173
1174 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1175         /*
1176          * Don't allow clients to connect that are using old 1.8 format
1177          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1178          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1179          * FULL20 flag should be set on all connections since 2.0, but no
1180          * longer affects behaviour.
1181          *
1182          * Later this check will be disabled and the flag can be retired
1183          * completely once interop with 3.0 is no longer needed.
1184          */
1185         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1186                 GOTO(out, rc = -EPROTO);
1187
1188         /*
1189          * Don't allow liblustre clients to connect.
1190          * - testing was disabled in v2_2_50_0-61-g6a75d65
1191          * - building was disabled in v2_5_58_0-28-g7277179
1192          * - client code was deleted in v2_6_50_0-101-gcdfbc72,
1193          * - clients were refused connect for version difference > 0.0.1.32
1194          */
1195         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1196                 DEBUG_REQ(D_WARNING, req, "Refusing libclient connection");
1197                 GOTO(out, rc = -EPROTO);
1198         }
1199 #endif
1200
1201         /*
1202          * Note: lw_client is needed in MDS-MDS failover during update log
1203          * processing, so we needs to allow lw_client to be connected at
1204          * anytime, instead of only the initial connection
1205          */
1206         lw_client = (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0;
1207
1208         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1209                 initial_conn = true;
1210                 mds_conn = (data->ocd_connect_flags & OBD_CONNECT_MDS) != 0;
1211                 mds_mds_conn = (data->ocd_connect_flags &
1212                                 OBD_CONNECT_MDS_MDS) != 0;
1213
1214                 /*
1215                  * OBD_CONNECT_MNE_SWAB is removed at 2.14
1216                  * Checking OBD_CONNECT_FID can be removed in the future.
1217                  *
1218                  * Via check OBD_CONNECT_FID, we can distinguish whether
1219                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1220                  * MGC or MDT, since MGC does not use OBD_CONNECT_FID.
1221                  */
1222                 if (!lw_client &&
1223                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1224                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1225                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1226                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1227                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1228                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1229
1230                         /*
1231                          * We do not support the MDT-MDT interoperations with
1232                          * different version MDT because of protocol changes.
1233                          */
1234                         if (unlikely(major != LUSTRE_MAJOR ||
1235                                      minor != LUSTRE_MINOR ||
1236                                      abs(patch - LUSTRE_PATCH) > 3)) {
1237                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the connection from different version MDT (%d.%d.%d.%d) %s %s\n",
1238                                               target->obd_name, LUSTRE_MAJOR,
1239                                               LUSTRE_MINOR, LUSTRE_PATCH,
1240                                               LUSTRE_FIX, major, minor, patch,
1241                                               OBD_OCD_VERSION_FIX(data->ocd_version),
1242                                               libcfs_nid2str(req->rq_peer.nid),
1243                                               str);
1244                                 GOTO(out, rc = -EPROTO);
1245                         }
1246                 }
1247         }
1248
1249         /* lctl gets a backstage, all-access pass. */
1250         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1251                 goto dont_check_exports;
1252
1253         export = obd_uuid_lookup(target, &cluuid);
1254         if (!export)
1255                 goto no_export;
1256
1257         /* We've found an export in the hash. */
1258
1259         spin_lock(&export->exp_lock);
1260
1261         if (export->exp_connecting) { /* b=9635, et. al. */
1262                 spin_unlock(&export->exp_lock);
1263                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1264                               export->exp_obd->obd_name, export,
1265                               libcfs_nid2str(req->rq_peer.nid));
1266                 class_export_put(export);
1267                 export = NULL;
1268                 rc = -EALREADY;
1269         } else if ((mds_conn || (lw_client && initial_conn) ||
1270                    data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1271                    export->exp_connection != NULL) {
1272                 spin_unlock(&export->exp_lock);
1273                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1274                         /* MDS or LWP reconnected after failover. */
1275                         LCONSOLE_WARN("%s: Received %s connection from %s, removing former export from %s\n",
1276                                       target->obd_name,
1277                                       mds_conn ? "MDS" : "LWP",
1278                                       libcfs_nid2str(req->rq_peer.nid),
1279                                       libcfs_nid2str(export->exp_connection->c_peer.nid));
1280                 } else {
1281                         /* New MDS connection from the same NID. */
1282                         LCONSOLE_WARN("%s: Received new %s connection from %s, removing former export from same NID\n",
1283                                       target->obd_name,
1284                                       mds_conn ? "MDS" : "LWP",
1285                                       libcfs_nid2str(req->rq_peer.nid));
1286                 }
1287
1288                 if (req->rq_peer.nid == export->exp_connection->c_peer.nid &&
1289                     data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
1290                         /*
1291                          * Because exports between MDTs will always be
1292                          * kept, let's do not fail such export if they
1293                          * come from the same NID, otherwise it might
1294                          * cause eviction between MDTs, which might
1295                          * cause namespace inconsistency
1296                          */
1297                         spin_lock(&export->exp_lock);
1298                         export->exp_connecting = 1;
1299                         export->exp_conn_cnt = 0;
1300                         spin_unlock(&export->exp_lock);
1301                         conn.cookie = export->exp_handle.h_cookie;
1302                         rc = EALREADY;
1303                 } else {
1304                         class_fail_export(export);
1305                         class_export_put(export);
1306                         export = NULL;
1307                         rc = 0;
1308                 }
1309         } else if (export->exp_connection != NULL && initial_conn &&
1310                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1311                 spin_unlock(&export->exp_lock);
1312                 /* In MDS failover we have static UUID but NID can change. */
1313                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when existing nid %s is already connected\n",
1314                               target->obd_name, cluuid.uuid,
1315                               libcfs_nid2str(req->rq_peer.nid),
1316                               libcfs_nid2str(
1317                                         export->exp_connection->c_peer.nid));
1318                 rc = -EALREADY;
1319                 class_export_put(export);
1320                 export = NULL;
1321         } else if (OBD_FAIL_PRECHECK(OBD_FAIL_TGT_RECOVERY_CONNECT) &&
1322                    !lw_client) {
1323                 spin_unlock(&export->exp_lock);
1324                 rc = -EAGAIN;
1325         } else {
1326                 export->exp_connecting = 1;
1327                 spin_unlock(&export->exp_lock);
1328                 LASSERT(export->exp_obd == target);
1329
1330                 rc = target_handle_reconnect(&conn, export, &cluuid);
1331         }
1332
1333         /* If we found an export, we already unlocked. */
1334         if (!export) {
1335 no_export:
1336                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1337         } else if (req->rq_export == NULL &&
1338                    atomic_read(&export->exp_rpc_count) > 0) {
1339                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, still busy with %d references\n",
1340                               target->obd_name, cluuid.uuid,
1341                               libcfs_nid2str(req->rq_peer.nid),
1342                               refcount_read(&export->exp_handle.h_ref));
1343                         GOTO(out, rc = -EBUSY);
1344         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
1345                    rc != EALREADY) {
1346                 if (!strstr(cluuid.uuid, "mdt"))
1347                         LCONSOLE_WARN("%s: Rejecting reconnect from the known client %s (at %s) because it is indicating it is a new client\n",
1348                                       target->obd_name, cluuid.uuid,
1349                                       libcfs_nid2str(req->rq_peer.nid));
1350                 GOTO(out, rc = -EALREADY);
1351         } else {
1352                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1353         }
1354
1355         if (rc < 0)
1356                 GOTO(out, rc);
1357
1358         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %lld last %lld\n",
1359                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1360                target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1361                export, ktime_get_seconds(),
1362                export ? export->exp_last_request_time : 0);
1363
1364         /*
1365          * If this is the first time a client connects, reset the recovery
1366          * timer. Discard lightweight connections which might be local.
1367          */
1368         if (!lw_client && rc == 0 && target->obd_recovering)
1369                 check_and_start_recovery_timer(target, req, export == NULL);
1370
1371         /*
1372          * We want to handle EALREADY but *not* -EALREADY from
1373          * target_handle_reconnect(), return reconnection state in a flag.
1374          */
1375         if (rc == EALREADY) {
1376                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1377                 rc = 0;
1378         } else {
1379                 LASSERT(rc == 0);
1380         }
1381
1382         /* Tell the client if we support replayable requests. */
1383         if (target->obd_replayable)
1384                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1385         client_nid = &req->rq_peer.nid;
1386
1387         if (export == NULL) {
1388                 /* allow lightweight connections during recovery */
1389                 /*
1390                  * allow "new" MDT to be connected during recovery, since we
1391                  * need retrieve recovery update records from it
1392                  */
1393                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1394                         struct hrtimer *timer = &target->obd_recovery_timer;
1395                         ktime_t remaining;
1396                         s64 timeout, left;
1397                         int in_progress;
1398                         int connected;
1399                         int known;
1400                         int stale;
1401                         char *msg;
1402
1403                         connected = atomic_read(&target->obd_connected_clients);
1404                         in_progress = atomic_read(&target->obd_lock_replay_clients);
1405                         known =
1406                            atomic_read(&target->obd_max_recoverable_clients);
1407                         stale = target->obd_stale_clients;
1408                         remaining = hrtimer_get_remaining(timer);
1409                         left = ktime_divns(remaining, NSEC_PER_SEC);
1410
1411                         if (ktime_to_ns(remaining) > 0) {
1412                                 msg = "to recover in";
1413                                 timeout = left;
1414                         } else {
1415                                 msg = "already passed deadline";
1416                                 timeout = -left;
1417
1418                                 target_check_recovery_timer(target);
1419                         }
1420
1421                         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",
1422                                       target->obd_name, cluuid.uuid,
1423                                       libcfs_nid2str(req->rq_peer.nid), known,
1424                                       connected - in_progress, in_progress,
1425                                       stale, msg, timeout / 60, timeout % 60);
1426                         rc = -EBUSY;
1427                 } else {
1428 dont_check_exports:
1429                         rc = obd_connect(req->rq_svc_thread->t_env,
1430                                          &export, target, &cluuid, data,
1431                                          client_nid);
1432                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1433                                 lustre_msg_add_op_flags(req->rq_repmsg,
1434                                                         MSG_CONNECT_RECOVERING);
1435                         if (rc == 0) {
1436                                 conn.cookie = export->exp_handle.h_cookie;
1437                                 rc = rev_import_init(export);
1438                         }
1439
1440                         if (mds_mds_conn)
1441                                 new_mds_mds_conn = true;
1442                 }
1443         } else {
1444                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1445                                    export, target, &cluuid, data, client_nid);
1446         }
1447         if (rc)
1448                 GOTO(out, rc);
1449
1450         LASSERT(target->u.obt.obt_magic == OBT_MAGIC);
1451         data->ocd_instance = target->u.obt.obt_instance;
1452
1453         /*
1454          * Return only the parts of obd_connect_data that we understand, so the
1455          * client knows that we don't understand the rest.
1456          */
1457         if (data) {
1458                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1459                                                RCL_SERVER);
1460                 tmpdata = req_capsule_server_get(&req->rq_pill,
1461                                                  &RMF_CONNECT_DATA);
1462                 /*
1463                  * Don't use struct assignment here, because the client reply
1464                  * buffer may be smaller/larger than the local struct
1465                  * obd_connect_data.
1466                  */
1467                 memcpy(tmpdata, data, min(tmpsize, size));
1468         }
1469
1470         /*
1471          * If the client and the server are the same node, we will already
1472          * have an export that really points to the client's DLM export,
1473          * because we have a shared handles table.
1474          *
1475          * XXX this will go away when shaver stops sending the "connect" handle
1476          * in the real "remote handle" field of the request --phik 24 Apr 2003
1477          */
1478         ptlrpc_request_change_export(req, export);
1479
1480         pcon = ptlrpc_connection_get(req->rq_peer, req->rq_self, &cluuid);
1481         if (pcon == NULL)
1482                 GOTO(out, rc = -ENOTCONN);
1483
1484         spin_lock(&export->exp_lock);
1485
1486         if (export->exp_disconnected) {
1487                 spin_unlock(&export->exp_lock);
1488                 GOTO(out, rc = -ENODEV);
1489         }
1490         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1491                 spin_unlock(&export->exp_lock);
1492                 CDEBUG(D_RPCTRACE,
1493                        "%s: %s already connected at greater or equal conn_cnt: %d >= %d\n",
1494                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1495                        export->exp_conn_cnt,
1496                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1497
1498                 GOTO(out, rc = -EALREADY);
1499         }
1500         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1501         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1502
1503         /* Check to see if connection came from another NID. */
1504         if (export->exp_connection != NULL &&
1505             export->exp_connection->c_peer.nid != req->rq_peer.nid) {
1506                 obd_nid_del(export->exp_obd, export);
1507                 ptlrpc_connection_put(export->exp_connection);
1508                 export->exp_connection = NULL;
1509         }
1510
1511         if (export->exp_connection == NULL) {
1512                 export->exp_connection = pcon;
1513                 pcon = NULL;
1514         }
1515         obd_nid_add(export->exp_obd, export);
1516
1517         spin_unlock(&export->exp_lock);
1518
1519         lustre_msg_set_handle(req->rq_repmsg, &conn);
1520
1521         rc = rev_import_reconnect(export, req);
1522         if (rc != 0)
1523                 GOTO(out, rc);
1524
1525         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1526                 int has_transno;
1527                 __u64 transno = data->ocd_transno;
1528
1529                 spin_lock(&export->exp_lock);
1530                 /*
1531                  * possible race with class_disconnect_stale_exports,
1532                  * export may be already in the eviction process
1533                  */
1534                 if (export->exp_failed) {
1535                         spin_unlock(&export->exp_lock);
1536                         GOTO(out, rc = -ENODEV);
1537                 }
1538                 export->exp_in_recovery = 1;
1539                 export->exp_req_replay_needed = 1;
1540                 export->exp_lock_replay_needed = 1;
1541                 spin_unlock(&export->exp_lock);
1542
1543                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1544                                  MSG_CONNECT_TRANSNO);
1545                 if (has_transno && transno == 0)
1546                         CWARN("Connect with zero transno!\n");
1547
1548                 if (has_transno && transno > 0 &&
1549                     transno < target->obd_next_recovery_transno &&
1550                     transno > target->obd_last_committed) {
1551                         /* Another way is to use cmpxchg() to be lock-free. */
1552                         spin_lock(&target->obd_recovery_task_lock);
1553                         if (transno < target->obd_next_recovery_transno)
1554                                 target->obd_next_recovery_transno = transno;
1555                         spin_unlock(&target->obd_recovery_task_lock);
1556                 }
1557
1558                 atomic_inc(&target->obd_req_replay_clients);
1559                 atomic_inc(&target->obd_lock_replay_clients);
1560                 /*
1561                  * Note: MDS-MDS connection is allowed to be connected during
1562                  * recovery, no matter if the exports needs to be recoveried.
1563                  * Because we need retrieve updates logs from all other MDTs.
1564                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1565                  * also needs to be increased to match other recovery checking
1566                  * condition.
1567                  */
1568                 if (new_mds_mds_conn)
1569                         atomic_inc(&target->obd_max_recoverable_clients);
1570
1571                 if (atomic_inc_return(&target->obd_connected_clients) ==
1572                     atomic_read(&target->obd_max_recoverable_clients))
1573                         wake_up(&target->obd_next_transno_waitq);
1574         }
1575
1576         /* Tell the client we're in recovery, when client is involved in it. */
1577         if (target->obd_recovering && !lw_client)
1578                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1579
1580 out:
1581         if (export) {
1582                 spin_lock(&export->exp_lock);
1583                 export->exp_connecting = 0;
1584                 spin_unlock(&export->exp_lock);
1585
1586                 class_export_put(export);
1587         }
1588         if (target != NULL) {
1589                 spin_lock(&target->obd_dev_lock);
1590                 target->obd_conn_inprogress--;
1591                 spin_unlock(&target->obd_dev_lock);
1592                 class_decref(target, "find", current);
1593         }
1594         if (pcon)
1595                 ptlrpc_connection_put(pcon);
1596         req->rq_status = rc;
1597         RETURN(rc);
1598 }
1599
1600 int target_handle_disconnect(struct ptlrpc_request *req)
1601 {
1602         int rc;
1603
1604         ENTRY;
1605
1606         rc = req_capsule_server_pack(&req->rq_pill);
1607         if (rc)
1608                 RETURN(rc);
1609
1610         /* In case of target disconnect, updating sec ctx immediately is
1611          * required in order to record latest sequence number used.
1612          * Sequence is normally updated on export destroy, but this event
1613          * can occur too late, ie after a new target connect request has
1614          * been processed.
1615          * Maintaining correct sequence when client connection becomes idle
1616          * ensures that GSS does not erroneously consider requests as replays.
1617          */
1618         rc = sptlrpc_export_update_ctx(req->rq_export);
1619         if (rc)
1620                 RETURN(rc);
1621
1622         /* Keep the rq_export around so we can send the reply. */
1623         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1624
1625         RETURN(0);
1626 }
1627
1628 void target_destroy_export(struct obd_export *exp)
1629 {
1630         struct obd_import *imp = NULL;
1631         /*
1632          * exports created from last_rcvd data, and "fake"
1633          * exports created by lctl don't have an import
1634          */
1635         spin_lock(&exp->exp_lock);
1636         if (exp->exp_imp_reverse != NULL) {
1637                 imp = exp->exp_imp_reverse;
1638                 exp->exp_imp_reverse = NULL;
1639         }
1640         spin_unlock(&exp->exp_lock);
1641         if (imp != NULL)
1642                 client_destroy_import(imp);
1643
1644         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1645         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1646         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1647         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1648 }
1649 EXPORT_SYMBOL(target_destroy_export);
1650
1651 /*
1652  * Recovery functions
1653  */
1654 static void target_request_copy_get(struct ptlrpc_request *req)
1655 {
1656         class_export_rpc_inc(req->rq_export);
1657         LASSERT(list_empty(&req->rq_list));
1658         INIT_LIST_HEAD(&req->rq_replay_list);
1659
1660         /* Increase refcount to keep request in queue. */
1661         atomic_inc(&req->rq_refcount);
1662         /* Let export know it has replays to be handled. */
1663         atomic_inc(&req->rq_export->exp_replay_count);
1664 }
1665
1666 static void target_request_copy_put(struct ptlrpc_request *req)
1667 {
1668         LASSERT(list_empty(&req->rq_replay_list));
1669         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1670
1671         atomic_dec(&req->rq_export->exp_replay_count);
1672         class_export_rpc_dec(req->rq_export);
1673         ptlrpc_server_drop_request(req);
1674 }
1675
1676 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1677 {
1678         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1679         struct obd_export *exp = req->rq_export;
1680         struct ptlrpc_request *reqiter;
1681         struct ptlrpc_request *dup_req = NULL;
1682         int dup = 0;
1683
1684         LASSERT(exp);
1685
1686         spin_lock(&exp->exp_lock);
1687         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1688                             rq_replay_list) {
1689                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1690                         dup_req = reqiter;
1691                         dup = 1;
1692                         break;
1693                 }
1694         }
1695
1696         if (dup) {
1697                 /* We expect it with RESENT and REPLAY flags. */
1698                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1699                     (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1700                         CERROR("invalid flags %x of resent replay\n",
1701                                lustre_msg_get_flags(req->rq_reqmsg));
1702
1703                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1704                         __u32 new_conn;
1705
1706                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1707                         if (new_conn >
1708                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1709                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1710                                                         new_conn);
1711                 }
1712         } else {
1713                 list_add_tail(&req->rq_replay_list,
1714                               &exp->exp_req_replay_queue);
1715         }
1716
1717         spin_unlock(&exp->exp_lock);
1718         return dup;
1719 }
1720
1721 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1722 {
1723         LASSERT(!list_empty(&req->rq_replay_list));
1724         LASSERT(req->rq_export);
1725
1726         spin_lock(&req->rq_export->exp_lock);
1727         list_del_init(&req->rq_replay_list);
1728         spin_unlock(&req->rq_export->exp_lock);
1729 }
1730
1731 static void target_finish_recovery(struct lu_target *lut)
1732 {
1733         struct obd_device *obd = lut->lut_obd;
1734
1735         ENTRY;
1736
1737         /* Only log a recovery message when recovery has occurred. */
1738         if (obd->obd_recovery_start) {
1739                 time64_t now = ktime_get_seconds();
1740                 time64_t elapsed_time;
1741
1742                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start,
1743                                      1);
1744                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients %d recovered and %d %s evicted.\n",
1745                               obd->obd_name, elapsed_time / 60,
1746                               elapsed_time % 60,
1747                               atomic_read(&obd->obd_max_recoverable_clients),
1748                               atomic_read(&obd->obd_connected_clients),
1749                               obd->obd_stale_clients,
1750                               obd->obd_stale_clients == 1 ? "was" : "were");
1751         }
1752
1753         ldlm_reprocess_recovery_done(obd->obd_namespace);
1754         spin_lock(&obd->obd_recovery_task_lock);
1755         if (!list_empty(&obd->obd_req_replay_queue) ||
1756             !list_empty(&obd->obd_lock_replay_queue) ||
1757             !list_empty(&obd->obd_final_req_queue)) {
1758                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1759                        obd->obd_name,
1760                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1761                        list_empty(&obd->obd_lock_replay_queue) ? \
1762                                   "" : "lock ",
1763                        list_empty(&obd->obd_final_req_queue) ? \
1764                                   "" : "final ");
1765                 spin_unlock(&obd->obd_recovery_task_lock);
1766                 LBUG();
1767         }
1768         spin_unlock(&obd->obd_recovery_task_lock);
1769
1770         obd->obd_recovery_end = ktime_get_seconds();
1771
1772         /* When recovery finished, cleanup orphans on MDS and OST. */
1773         if (obd->obd_type && OBP(obd, postrecov)) {
1774                 int rc = OBP(obd, postrecov)(obd);
1775
1776                 if (rc < 0)
1777                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1778                                       obd->obd_name, rc);
1779         }
1780         EXIT;
1781 }
1782
1783 static void abort_req_replay_queue(struct obd_device *obd)
1784 {
1785         struct ptlrpc_request *req, *n;
1786         LIST_HEAD(abort_list);
1787
1788         spin_lock(&obd->obd_recovery_task_lock);
1789         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1790         spin_unlock(&obd->obd_recovery_task_lock);
1791         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1792                 DEBUG_REQ(D_WARNING, req, "aborted:");
1793                 req->rq_status = -ENOTCONN;
1794                 if (ptlrpc_error(req)) {
1795                         DEBUG_REQ(D_ERROR, req,
1796                                   "failed abort_req_reply; skipping");
1797                 }
1798                 target_exp_dequeue_req_replay(req);
1799                 target_request_copy_put(req);
1800         }
1801 }
1802
1803 static void abort_lock_replay_queue(struct obd_device *obd)
1804 {
1805         struct ptlrpc_request *req, *n;
1806         LIST_HEAD(abort_list);
1807
1808         spin_lock(&obd->obd_recovery_task_lock);
1809         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1810         spin_unlock(&obd->obd_recovery_task_lock);
1811         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1812                 DEBUG_REQ(D_ERROR, req, "aborted:");
1813                 req->rq_status = -ENOTCONN;
1814                 if (ptlrpc_error(req)) {
1815                         DEBUG_REQ(D_ERROR, req,
1816                                   "failed abort_lock_reply; skipping");
1817                 }
1818                 target_request_copy_put(req);
1819         }
1820 }
1821
1822 /*
1823  * Called from a cleanup function if the device is being cleaned up
1824  * forcefully.  The exports should all have been disconnected already,
1825  * the only thing left to do is
1826  * - clear the recovery flags
1827  * - cancel the timer
1828  * - free queued requests and replies, but don't send replies
1829  * Because the obd_stopping flag is set, no new requests should be received.
1830  */
1831 void target_cleanup_recovery(struct obd_device *obd)
1832 {
1833         struct ptlrpc_request *req, *n;
1834         LIST_HEAD(clean_list);
1835
1836         spin_lock(&obd->obd_dev_lock);
1837         if (!obd->obd_recovering) {
1838                 spin_unlock(&obd->obd_dev_lock);
1839                 EXIT;
1840                 return;
1841         }
1842         obd->obd_recovering = obd->obd_abort_recovery = 0;
1843         spin_unlock(&obd->obd_dev_lock);
1844
1845         spin_lock(&obd->obd_recovery_task_lock);
1846         target_cancel_recovery_timer(obd);
1847         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1848         spin_unlock(&obd->obd_recovery_task_lock);
1849
1850         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1851                 LASSERT(req->rq_reply_state == NULL);
1852                 target_exp_dequeue_req_replay(req);
1853                 target_request_copy_put(req);
1854         }
1855
1856         spin_lock(&obd->obd_recovery_task_lock);
1857         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1858         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1859         spin_unlock(&obd->obd_recovery_task_lock);
1860
1861         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1862                 LASSERT(req->rq_reply_state == NULL);
1863                 target_request_copy_put(req);
1864         }
1865
1866         EXIT;
1867 }
1868 EXPORT_SYMBOL(target_cleanup_recovery);
1869
1870 /* obd_recovery_task_lock should be held */
1871 void target_cancel_recovery_timer(struct obd_device *obd)
1872 {
1873         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1874         hrtimer_cancel(&obd->obd_recovery_timer);
1875 }
1876
1877 static void target_start_recovery_timer(struct obd_device *obd)
1878 {
1879         ktime_t delay;
1880
1881         if (obd->obd_recovery_start != 0)
1882                 return;
1883
1884         spin_lock(&obd->obd_dev_lock);
1885         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1886                 spin_unlock(&obd->obd_dev_lock);
1887                 return;
1888         }
1889
1890         LASSERT(obd->obd_recovery_timeout != 0);
1891
1892         if (obd->obd_recovery_start != 0) {
1893                 spin_unlock(&obd->obd_dev_lock);
1894                 return;
1895         }
1896
1897         obd->obd_recovery_start = ktime_get_seconds();
1898         delay = ktime_set(obd->obd_recovery_start +
1899                           obd->obd_recovery_timeout, 0);
1900         hrtimer_start(&obd->obd_recovery_timer, delay, HRTIMER_MODE_ABS);
1901         spin_unlock(&obd->obd_dev_lock);
1902
1903         LCONSOLE_WARN("%s: Will be in recovery for at least %u:%02u, or until %d client%s reconnect%s\n",
1904                       obd->obd_name,
1905                       obd->obd_recovery_timeout / 60,
1906                       obd->obd_recovery_timeout % 60,
1907                       atomic_read(&obd->obd_max_recoverable_clients),
1908                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1909                       "" : "s",
1910                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1911                       "s" : "");
1912 }
1913
1914 /**
1915  * extend recovery window.
1916  *
1917  * if @extend is true, extend recovery window to have @dr_timeout remaining
1918  * at least; otherwise, make sure the recovery timeout value is not less
1919  * than @dr_timeout.
1920  */
1921 static void extend_recovery_timer(struct obd_device *obd, timeout_t dr_timeout,
1922                                   bool extend)
1923 {
1924         ktime_t left_ns;
1925         timeout_t timeout;
1926         timeout_t left;
1927
1928         spin_lock(&obd->obd_dev_lock);
1929         if (!obd->obd_recovering || obd->obd_abort_recovery ||
1930             obd->obd_stopping) {
1931                 spin_unlock(&obd->obd_dev_lock);
1932                 return;
1933         }
1934         LASSERT(obd->obd_recovery_start != 0);
1935
1936         left_ns = hrtimer_get_remaining(&obd->obd_recovery_timer);
1937         left = ktime_divns(left_ns, NSEC_PER_SEC);
1938
1939         if (extend) {
1940                 timeout = obd->obd_recovery_timeout;
1941                 /* dr_timeout will happen after the hrtimer has expired.
1942                  * Add the excess time to the soft recovery timeout without
1943                  * exceeding the hard recovery timeout.
1944                  */
1945                 if (dr_timeout > left) {
1946                         timeout += dr_timeout - left;
1947                         timeout = min_t(timeout_t, obd->obd_recovery_time_hard,
1948                                         timeout);
1949                 }
1950         } else {
1951                 timeout = clamp_t(timeout_t, dr_timeout,
1952                                   obd->obd_recovery_timeout,
1953                                   obd->obd_recovery_time_hard);
1954         }
1955
1956         if (timeout == obd->obd_recovery_time_hard)
1957                 CWARN("%s: extended recovery timer reached hard limit: %d, extend: %d\n",
1958                       obd->obd_name, timeout, extend);
1959
1960         if (obd->obd_recovery_timeout < timeout) {
1961                 ktime_t end, now;
1962
1963                 obd->obd_recovery_timeout = timeout;
1964                 end = ktime_set(obd->obd_recovery_start + timeout, 0);
1965                 now = ktime_set(ktime_get_seconds(), 0);
1966                 left_ns = ktime_sub(end, now);
1967                 hrtimer_start(&obd->obd_recovery_timer, end, HRTIMER_MODE_ABS);
1968                 left = ktime_divns(left_ns, NSEC_PER_SEC);
1969         }
1970         spin_unlock(&obd->obd_dev_lock);
1971
1972         CDEBUG(D_HA, "%s: recovery timer will expire in %d seconds\n",
1973                 obd->obd_name, left);
1974 }
1975
1976 /* Reset the timer with each new client connection */
1977 /*
1978  * This timer is actually reconnect_timer, which is for making sure
1979  * the total recovery window is at least as big as my reconnect
1980  * attempt timing. So the initial recovery time_out will be set to
1981  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1982  * from client is bigger than this, then the recovery time_out will
1983  * be extended to make sure the client could be reconnected, in the
1984  * process, the timeout from the new client should be ignored.
1985  */
1986 static void
1987 check_and_start_recovery_timer(struct obd_device *obd,
1988                                struct ptlrpc_request *req,
1989                                int new_client)
1990 {
1991         timeout_t service_timeout = lustre_msg_get_service_timeout(req->rq_reqmsg);
1992         struct obd_device_target *obt = &obd->u.obt;
1993
1994         if (!new_client && service_timeout)
1995                 /*
1996                  * Teach server about old server's estimates, as first guess
1997                  * at how long new requests will take.
1998                  */
1999                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
2000                             service_timeout);
2001
2002         target_start_recovery_timer(obd);
2003
2004         /*
2005          * Convert the service time to RPC timeout,
2006          * and reuse service_timeout to limit stack usage.
2007          */
2008         service_timeout = at_est2timeout(service_timeout);
2009
2010         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
2011             service_timeout < at_extra)
2012                 service_timeout = at_extra;
2013
2014         /*
2015          * We expect other clients to timeout within service_timeout, then try
2016          * to reconnect, then try the failover server.  The max delay between
2017          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL.
2018          */
2019         service_timeout += 2 * INITIAL_CONNECT_TIMEOUT;
2020
2021         LASSERT(obt->obt_magic == OBT_MAGIC);
2022         service_timeout += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
2023         if (service_timeout > obd->obd_recovery_timeout && !new_client)
2024                 extend_recovery_timer(obd, service_timeout, false);
2025 }
2026
2027 /** Health checking routines */
2028 static inline int exp_connect_healthy(struct obd_export *exp)
2029 {
2030         return exp->exp_in_recovery;
2031 }
2032
2033 /** if export done req_replay or has replay in queue */
2034 static inline int exp_req_replay_healthy(struct obd_export *exp)
2035 {
2036         return (!exp->exp_req_replay_needed ||
2037                 atomic_read(&exp->exp_replay_count) > 0);
2038 }
2039
2040
2041 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
2042 {
2043         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
2044                exp_req_replay_healthy(exp);
2045 }
2046
2047 /** if export done lock_replay or has replay in queue */
2048 static inline int exp_lock_replay_healthy(struct obd_export *exp)
2049 {
2050         return (!exp->exp_lock_replay_needed ||
2051                 atomic_read(&exp->exp_replay_count) > 0);
2052 }
2053
2054 static inline int exp_vbr_healthy(struct obd_export *exp)
2055 {
2056         return !exp->exp_vbr_failed;
2057 }
2058
2059 static inline int exp_finished(struct obd_export *exp)
2060 {
2061         return exp->exp_in_recovery && !exp->exp_lock_replay_needed;
2062 }
2063
2064 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
2065 {
2066         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
2067                 exp_finished(exp);
2068 }
2069
2070 static int check_for_next_transno(struct lu_target *lut)
2071 {
2072         struct ptlrpc_request *req = NULL;
2073         struct obd_device *obd = lut->lut_obd;
2074         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2075         int wake_up = 0, connected, completed, queue_len;
2076         __u64 req_transno = 0;
2077         __u64 update_transno = 0;
2078         __u64 next_transno = 0;
2079
2080         ENTRY;
2081
2082         spin_lock(&obd->obd_recovery_task_lock);
2083         if (!list_empty(&obd->obd_req_replay_queue)) {
2084                 req = list_entry(obd->obd_req_replay_queue.next,
2085                                      struct ptlrpc_request, rq_list);
2086                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
2087         }
2088
2089         if (!obd->obd_abort_recov_mdt && tdtd)
2090                 update_transno = distribute_txn_get_next_transno(tdtd);
2091
2092         connected = atomic_read(&obd->obd_connected_clients);
2093         completed = connected - atomic_read(&obd->obd_req_replay_clients);
2094         queue_len = obd->obd_requests_queued_for_recovery;
2095         next_transno = obd->obd_next_recovery_transno;
2096
2097         CDEBUG(D_HA,
2098                "max: %d, connected: %d, completed: %d, queue_len: %d, req_transno: %llu, next_transno: %llu\n",
2099                atomic_read(&obd->obd_max_recoverable_clients),
2100                connected, completed,
2101                queue_len, req_transno, next_transno);
2102
2103         if (obd->obd_abort_recovery) {
2104                 CDEBUG(D_HA, "waking for aborted recovery\n");
2105                 wake_up = 1;
2106         } else if (obd->obd_recovery_expired) {
2107                 CDEBUG(D_HA, "waking for expired recovery\n");
2108                 wake_up = 1;
2109         } else if (!obd->obd_abort_recov_mdt && tdtd && req &&
2110                    is_req_replayed_by_update(req)) {
2111                 LASSERTF(req_transno < next_transno,
2112                          "req_transno %llu next_transno%llu\n", req_transno,
2113                          next_transno);
2114                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
2115                        req_transno);
2116                 wake_up = 1;
2117         } else if (req_transno == next_transno ||
2118                    (update_transno != 0 && update_transno <= next_transno)) {
2119                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
2120                 wake_up = 1;
2121         } else if (queue_len > 0 &&
2122                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
2123                 /** handle gaps occured due to lost reply or VBR */
2124                 LASSERTF(req_transno >= next_transno,
2125                          "req_transno: %llu, next_transno: %llu\n",
2126                          req_transno, next_transno);
2127                 CDEBUG(D_HA,
2128                        "%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",
2129                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
2130                        next_transno, queue_len, completed, connected,
2131                        req_transno, update_transno, obd->obd_last_committed);
2132                 obd->obd_next_recovery_transno = req_transno;
2133                 wake_up = 1;
2134         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
2135                 CDEBUG(D_HA, "waking for completed recovery\n");
2136                 wake_up = 1;
2137         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
2138                 CDEBUG(D_HA,
2139                        "accepting transno gaps is explicitly allowed by fail_lock, waking up (%lld)\n",
2140                        next_transno);
2141                 obd->obd_next_recovery_transno = req_transno;
2142                 wake_up = 1;
2143         }
2144         spin_unlock(&obd->obd_recovery_task_lock);
2145         return wake_up;
2146 }
2147
2148 static int check_for_next_lock(struct lu_target *lut)
2149 {
2150         struct obd_device *obd = lut->lut_obd;
2151         int wake_up = 0;
2152
2153         spin_lock(&obd->obd_recovery_task_lock);
2154         if (!list_empty(&obd->obd_lock_replay_queue)) {
2155                 CDEBUG(D_HA, "waking for next lock\n");
2156                 wake_up = 1;
2157         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
2158                 CDEBUG(D_HA, "waking for completed lock replay\n");
2159                 wake_up = 1;
2160         } else if (obd->obd_abort_recovery) {
2161                 CDEBUG(D_HA, "waking for aborted recovery\n");
2162                 wake_up = 1;
2163         } else if (obd->obd_recovery_expired) {
2164                 CDEBUG(D_HA, "waking for expired recovery\n");
2165                 wake_up = 1;
2166         }
2167         spin_unlock(&obd->obd_recovery_task_lock);
2168
2169         return wake_up;
2170 }
2171
2172 static int check_update_llog(struct lu_target *lut)
2173 {
2174         struct obd_device *obd = lut->lut_obd;
2175         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2176
2177         if (obd->obd_abort_recovery) {
2178                 CDEBUG(D_HA, "waking for aborted recovery\n");
2179                 return 1;
2180         }
2181
2182         if (atomic_read(&tdtd->tdtd_recovery_threads_count) == 0) {
2183                 CDEBUG(D_HA, "waking for completion of reading update log\n");
2184                 return 1;
2185         }
2186
2187         return 0;
2188 }
2189
2190 /**
2191  * wait for recovery events,
2192  * check its status with help of check_routine
2193  * evict dead clients via health_check
2194  */
2195 static int target_recovery_overseer(struct lu_target *lut,
2196                                     int (*check_routine)(struct lu_target *),
2197                                     int (*health_check)(struct obd_export *))
2198 {
2199         struct obd_device *obd = lut->lut_obd;
2200         struct target_distribute_txn_data *tdtd;
2201         time64_t last = 0;
2202         time64_t now;
2203 repeat:
2204         if (obd->obd_recovering && obd->obd_recovery_start == 0) {
2205                 now = ktime_get_seconds();
2206                 if (now - last > 600) {
2207                         LCONSOLE_INFO("%s: in recovery but waiting for the first client to connect\n",
2208                                       obd->obd_name);
2209                         last = now;
2210                 }
2211         }
2212         if (obd->obd_recovery_start != 0 && ktime_get_seconds() >=
2213               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
2214                 __u64 next_update_transno = 0;
2215
2216                 /*
2217                  * Only abort the recovery if there are no update recovery
2218                  * left in the queue
2219                  */
2220                 spin_lock(&obd->obd_recovery_task_lock);
2221                 if (!obd->obd_abort_recov_mdt && lut->lut_tdtd) {
2222                         next_update_transno =
2223                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2224
2225                         tdtd = lut->lut_tdtd;
2226                         /*
2227                          * If next_update_transno == 0, it probably because
2228                          * updatelog retrieve threads did not get any records
2229                          * yet, let's wait those threads stopped
2230                          */
2231                         if (next_update_transno == 0) {
2232                                 spin_unlock(&obd->obd_recovery_task_lock);
2233
2234                                 while (wait_event_timeout(
2235                                         tdtd->tdtd_recovery_threads_waitq,
2236                                         check_update_llog(lut),
2237                                         cfs_time_seconds(60)) == 0);
2238
2239                                 spin_lock(&obd->obd_recovery_task_lock);
2240                                 next_update_transno =
2241                                         distribute_txn_get_next_transno(tdtd);
2242                         }
2243                 }
2244
2245                 if (next_update_transno != 0 && !obd->obd_abort_recovery) {
2246                         obd->obd_next_recovery_transno = next_update_transno;
2247                         spin_unlock(&obd->obd_recovery_task_lock);
2248                         /*
2249                          * Disconnect unfinished exports from clients, and
2250                          * keep connection from MDT to make sure the update
2251                          * recovery will still keep trying until some one
2252                          * manually abort the recovery
2253                          */
2254                         class_disconnect_stale_exports(obd,
2255                                                 exp_finished_or_from_mdt);
2256                         /* Abort all of replay & replay lock req from clients */
2257                         abort_req_replay_queue(obd);
2258                         abort_lock_replay_queue(obd);
2259                         CDEBUG(D_HA,
2260                                "%s: there are still update replay (%#llx)in the queue.\n",
2261                                obd->obd_name, next_update_transno);
2262                 } else {
2263                         obd->obd_abort_recovery = 1;
2264                         spin_unlock(&obd->obd_recovery_task_lock);
2265                         CWARN("%s recovery is aborted by hard timeout\n",
2266                               obd->obd_name);
2267                 }
2268         }
2269
2270         while (wait_event_timeout(obd->obd_next_transno_waitq,
2271                                   check_routine(lut),
2272                                   cfs_time_seconds(60)) == 0)
2273                 ; /* wait indefinitely for event, but don't trigger watchdog */
2274
2275         if (obd->obd_abort_recovery) {
2276                 CWARN("recovery is aborted, evict exports in recovery\n");
2277                 if (lut->lut_tdtd != NULL) {
2278                         tdtd = lut->lut_tdtd;
2279                         /*
2280                          * Let's wait all of the update log recovery thread
2281                          * finished
2282                          */
2283                         wait_event_idle(
2284                                 tdtd->tdtd_recovery_threads_waitq,
2285                                 atomic_read(&tdtd->tdtd_recovery_threads_count)
2286                                 == 0);
2287                         /* Then abort the update recovery list */
2288                         dtrq_list_destroy(lut->lut_tdtd);
2289                 }
2290
2291                 /** evict exports which didn't finish recovery yet */
2292                 class_disconnect_stale_exports(obd, exp_finished);
2293                 return 1;
2294         } else if (obd->obd_recovery_expired) {
2295                 obd->obd_recovery_expired = 0;
2296
2297                 /** If some clients died being recovered, evict them */
2298                 LCONSOLE_WARN("%s: recovery is timed out, evict stale exports\n",
2299                               obd->obd_name);
2300                 /** evict cexports with no replay in queue, they are stalled */
2301                 class_disconnect_stale_exports(obd, health_check);
2302
2303                 /** continue with VBR */
2304                 spin_lock(&obd->obd_dev_lock);
2305                 obd->obd_version_recov = 1;
2306                 spin_unlock(&obd->obd_dev_lock);
2307                 /**
2308                  * reset timer, recovery will proceed with versions now,
2309                  * timeout is set just to handle reconnection delays
2310                  */
2311                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2312                 /**
2313                  * Wait for recovery events again, after evicting bad clients
2314                  */
2315                 goto repeat;
2316         }
2317         return 0;
2318 }
2319
2320 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2321 {
2322         struct obd_device *obd = lut->lut_obd;
2323         struct ptlrpc_request *req = NULL;
2324
2325         CDEBUG(D_HA, "Waiting for lock\n");
2326         if (target_recovery_overseer(lut, check_for_next_lock,
2327                                      exp_lock_replay_healthy))
2328                 abort_lock_replay_queue(obd);
2329
2330         spin_lock(&obd->obd_recovery_task_lock);
2331         if (!list_empty(&obd->obd_lock_replay_queue)) {
2332                 req = list_entry(obd->obd_lock_replay_queue.next,
2333                                      struct ptlrpc_request, rq_list);
2334                 list_del_init(&req->rq_list);
2335                 spin_unlock(&obd->obd_recovery_task_lock);
2336         } else {
2337                 spin_unlock(&obd->obd_recovery_task_lock);
2338                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2339                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2340                 /** evict exports failed VBR */
2341                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2342         }
2343         return req;
2344 }
2345
2346 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2347 {
2348         struct ptlrpc_request *req = NULL;
2349
2350         spin_lock(&obd->obd_recovery_task_lock);
2351         if (!list_empty(&obd->obd_final_req_queue)) {
2352                 req = list_entry(obd->obd_final_req_queue.next,
2353                                      struct ptlrpc_request, rq_list);
2354                 list_del_init(&req->rq_list);
2355                 spin_unlock(&obd->obd_recovery_task_lock);
2356                 if (req->rq_export->exp_in_recovery) {
2357                         spin_lock(&req->rq_export->exp_lock);
2358                         req->rq_export->exp_in_recovery = 0;
2359                         spin_unlock(&req->rq_export->exp_lock);
2360                 }
2361         } else {
2362                 spin_unlock(&obd->obd_recovery_task_lock);
2363         }
2364         return req;
2365 }
2366
2367 static void handle_recovery_req(struct ptlrpc_thread *thread,
2368                                 struct ptlrpc_request *req,
2369                                 svc_handler_t handler)
2370 {
2371         ENTRY;
2372
2373         /**
2374          * export can be evicted during recovery, no need to handle replays for
2375          * it after that, discard such request silently
2376          */
2377         if (req->rq_export->exp_disconnected)
2378                 RETURN_EXIT;
2379
2380         req->rq_session.lc_thread = thread;
2381         req->rq_svc_thread = thread;
2382         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2383
2384         /* thread context */
2385         lu_context_enter(&thread->t_env->le_ctx);
2386         (void)handler(req);
2387         lu_context_exit(&thread->t_env->le_ctx);
2388
2389         req->rq_svc_thread->t_env->le_ses = NULL;
2390
2391         /* don't reset timer for final stage */
2392         if (!exp_finished(req->rq_export)) {
2393                 timeout_t timeout = obd_timeout;
2394
2395                 /**
2396                  * Add request @timeout to the recovery time so next request from
2397                  * this client may come in recovery time
2398                  */
2399                 if (!AT_OFF) {
2400                         struct ptlrpc_service_part *svcpt;
2401                         timeout_t est_timeout;
2402
2403                         svcpt = req->rq_rqbd->rqbd_svcpt;
2404                         /*
2405                          * If the server sent early reply for this request,
2406                          * the client will recalculate the timeout according to
2407                          * current server estimate service time, so we will
2408                          * use the maxium timeout here for waiting the client
2409                          * sending the next req
2410                          */
2411                         est_timeout = at_get(&svcpt->scp_at_estimate);
2412                         timeout = max_t(timeout_t, at_est2timeout(est_timeout),
2413                                         lustre_msg_get_timeout(req->rq_reqmsg));
2414                         /*
2415                          * Add 2 net_latency, one for balance rq_deadline
2416                          * (see ptl_send_rpc), one for resend the req to server,
2417                          * Note: client will pack net_latency in replay req
2418                          * (see ptlrpc_replay_req)
2419                          */
2420                         timeout += 2 * lustre_msg_get_service_timeout(req->rq_reqmsg);
2421                 }
2422                 extend_recovery_timer(class_exp2obd(req->rq_export), timeout,
2423                                       true);
2424         }
2425         EXIT;
2426 }
2427
2428 /** Checking routines for recovery */
2429 static int check_for_recovery_ready(struct lu_target *lut)
2430 {
2431         struct obd_device *obd = lut->lut_obd;
2432         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2433
2434         CDEBUG(D_HA,
2435                "connected %d stale %d max_recoverable_clients %d abort %d expired %d\n",
2436                clnts, obd->obd_stale_clients,
2437                atomic_read(&obd->obd_max_recoverable_clients),
2438                obd->obd_abort_recovery, obd->obd_recovery_expired);
2439
2440         if (!obd->obd_abort_recovery && !obd->obd_recovery_expired) {
2441                 LASSERT(clnts <=
2442                         atomic_read(&obd->obd_max_recoverable_clients));
2443                 if (clnts + obd->obd_stale_clients <
2444                     atomic_read(&obd->obd_max_recoverable_clients))
2445                         return 0;
2446         }
2447
2448         if (!obd->obd_abort_recov_mdt && lut->lut_tdtd != NULL) {
2449                 if (!lut->lut_tdtd->tdtd_replay_ready &&
2450                     !obd->obd_abort_recovery && !obd->obd_stopping) {
2451                         /*
2452                          * Let's extend recovery timer, in case the recovery
2453                          * timer expired, and some clients got evicted
2454                          */
2455                         extend_recovery_timer(obd, obd->obd_recovery_timeout,
2456                                               true);
2457                         CDEBUG(D_HA,
2458                                "%s update recovery is not ready, extend recovery %d\n",
2459                                obd->obd_name, obd->obd_recovery_timeout);
2460                         return 0;
2461                 }
2462         }
2463
2464         return 1;
2465 }
2466
2467 enum {
2468         REQUEST_RECOVERY = 1,
2469         UPDATE_RECOVERY = 2,
2470 };
2471
2472 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2473 {
2474         __u64 transno = 0;
2475
2476         if (!list_empty(&obd->obd_req_replay_queue)) {
2477                 struct ptlrpc_request *req;
2478
2479                 req = list_entry(obd->obd_req_replay_queue.next,
2480                                  struct ptlrpc_request, rq_list);
2481                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2482         }
2483
2484         return transno;
2485 }
2486
2487 static __u64 get_next_transno(struct lu_target *lut, int *type)
2488 {
2489         struct obd_device *obd = lut->lut_obd;
2490         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2491         __u64 transno = 0;
2492         __u64 update_transno;
2493
2494         ENTRY;
2495
2496         transno = get_next_replay_req_transno(obd);
2497         if (type != NULL)
2498                 *type = REQUEST_RECOVERY;
2499
2500         if (!tdtd || obd->obd_abort_recov_mdt)
2501                 RETURN(transno);
2502
2503         update_transno = distribute_txn_get_next_transno(tdtd);
2504         if (transno == 0 || (transno >= update_transno &&
2505                              update_transno != 0)) {
2506                 transno = update_transno;
2507                 if (type != NULL)
2508                         *type = UPDATE_RECOVERY;
2509         }
2510
2511         RETURN(transno);
2512 }
2513
2514 /**
2515  * drop duplicate replay request
2516  *
2517  * Because the operation has been replayed by update recovery, the request
2518  * with the same transno will be dropped and also notify the client to send
2519  * next replay request.
2520  *
2521  * \param[in] env       execution environment
2522  * \param[in] obd       failover obd device
2523  * \param[in] req       request to be dropped
2524  */
2525 static void drop_duplicate_replay_req(struct lu_env *env,
2526                                       struct obd_device *obd,
2527                                       struct ptlrpc_request *req)
2528 {
2529         DEBUG_REQ(D_HA, req,
2530                   "remove t%lld from %s because duplicate update records found",
2531                   lustre_msg_get_transno(req->rq_reqmsg),
2532                   libcfs_nid2str(req->rq_peer.nid));
2533
2534         /*
2535          * Right now, only for MDS reint operation update replay and
2536          * normal request replay can have the same transno
2537          */
2538         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT) {
2539                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2540                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2541                 if (likely(req->rq_export))
2542                         target_committed_to_req(req);
2543                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2544                 target_send_reply(req, req->rq_status, 0);
2545         } else {
2546                 DEBUG_REQ(D_ERROR, req, "wrong opc from %s",
2547                 libcfs_nid2str(req->rq_peer.nid));
2548         }
2549         target_exp_dequeue_req_replay(req);
2550         target_request_copy_put(req);
2551         obd->obd_replayed_requests++;
2552 }
2553
2554 #define WATCHDOG_TIMEOUT (obd_timeout * 10)
2555
2556 static void replay_request_or_update(struct lu_env *env,
2557                                      struct lu_target *lut,
2558                                      struct target_recovery_data *trd,
2559                                      struct ptlrpc_thread *thread)
2560 {
2561         struct obd_device *obd = lut->lut_obd;
2562         struct ptlrpc_request *req = NULL;
2563         int type;
2564         __u64 transno;
2565
2566         ENTRY;
2567
2568         CDEBUG(D_HA, "Waiting for transno %lld\n",
2569                obd->obd_next_recovery_transno);
2570
2571         /* Replay all of request and update by transno */
2572         do {
2573                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2574
2575                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2576
2577                 /**
2578                  * It is needed to extend recovery window above
2579                  *  recovery_time_soft. Extending is possible only in the
2580                  *  end of recovery window (see more details in
2581                  *  handle_recovery_req()).
2582                  */
2583                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2584
2585                 if (target_recovery_overseer(lut, check_for_next_transno,
2586                                         exp_req_replay_healthy_or_from_mdt)) {
2587                         abort_req_replay_queue(obd);
2588                         abort_lock_replay_queue(obd);
2589                         goto abort;
2590                 }
2591
2592                 spin_lock(&obd->obd_recovery_task_lock);
2593                 transno = get_next_transno(lut, &type);
2594                 if (type == REQUEST_RECOVERY && transno != 0) {
2595                         /*
2596                          * Drop replay request from client side, if the
2597                          * replay has been executed by update with the
2598                          * same transno
2599                          */
2600                         req = list_entry(obd->obd_req_replay_queue.next,
2601                                         struct ptlrpc_request, rq_list);
2602
2603                         list_del_init(&req->rq_list);
2604                         obd->obd_requests_queued_for_recovery--;
2605                         spin_unlock(&obd->obd_recovery_task_lock);
2606
2607                         /*
2608                          * Let's check if the request has been redone by
2609                          * update replay
2610                          */
2611                         if (is_req_replayed_by_update(req)) {
2612                                 struct distribute_txn_replay_req *dtrq;
2613
2614                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2615                                                                       transno);
2616                                 LASSERT(dtrq != NULL);
2617                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2618                                 list_del_init(&dtrq->dtrq_list);
2619                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2620                                 dtrq_destroy(dtrq);
2621
2622                                 drop_duplicate_replay_req(env, obd, req);
2623
2624                                 continue;
2625                         }
2626
2627                         LASSERT(trd->trd_processing_task == current->pid);
2628                         DEBUG_REQ(D_HA, req, "processing x%llu t%lld from %s",
2629                                   req->rq_xid,
2630                                   lustre_msg_get_transno(req->rq_reqmsg),
2631                                   libcfs_nid2str(req->rq_peer.nid));
2632
2633                         ptlrpc_watchdog_init(&thread->t_watchdog,
2634                                              WATCHDOG_TIMEOUT);
2635                         handle_recovery_req(thread, req,
2636                                             trd->trd_recovery_handler);
2637                         ptlrpc_watchdog_disable(&thread->t_watchdog);
2638
2639                         /**
2640                          * bz18031: increase next_recovery_transno before
2641                          * target_request_copy_put() will drop exp_rpc reference
2642                          */
2643                         spin_lock(&obd->obd_recovery_task_lock);
2644                         obd->obd_next_recovery_transno++;
2645                         spin_unlock(&obd->obd_recovery_task_lock);
2646                         target_exp_dequeue_req_replay(req);
2647                         target_request_copy_put(req);
2648                         obd->obd_replayed_requests++;
2649                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2650                         struct distribute_txn_replay_req *dtrq;
2651                         int rc;
2652
2653                         spin_unlock(&obd->obd_recovery_task_lock);
2654
2655                         LASSERT(tdtd != NULL);
2656                         dtrq = distribute_txn_get_next_req(tdtd);
2657                         lu_context_enter(&thread->t_env->le_ctx);
2658                         ptlrpc_watchdog_init(&thread->t_watchdog,
2659                                              WATCHDOG_TIMEOUT);
2660                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2661                         ptlrpc_watchdog_disable(&thread->t_watchdog);
2662                         lu_context_exit(&thread->t_env->le_ctx);
2663                         extend_recovery_timer(obd, obd_timeout, true);
2664
2665                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2666                                 CDEBUG(D_HA,
2667                                        "Move x%llu t%llu to finish list\n",
2668                                        dtrq->dtrq_xid,
2669                                        dtrq->dtrq_master_transno);
2670
2671                                 /* Add it to the replay finish list */
2672                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2673                                 list_add(&dtrq->dtrq_list,
2674                                          &tdtd->tdtd_replay_finish_list);
2675                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2676
2677                                 spin_lock(&obd->obd_recovery_task_lock);
2678                                 if (transno == obd->obd_next_recovery_transno)
2679                                         obd->obd_next_recovery_transno++;
2680                                 else if (transno >
2681                                          obd->obd_next_recovery_transno)
2682                                         obd->obd_next_recovery_transno =
2683                                                                 transno + 1;
2684                                 spin_unlock(&obd->obd_recovery_task_lock);
2685                         } else {
2686                                 dtrq_destroy(dtrq);
2687                         }
2688                 } else {
2689                         spin_unlock(&obd->obd_recovery_task_lock);
2690 abort:
2691                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2692                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2693                         /** evict exports failed VBR */
2694                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2695                         break;
2696                 }
2697         } while (1);
2698 }
2699
2700 static int target_recovery_thread(void *arg)
2701 {
2702         struct lu_target *lut = arg;
2703         struct obd_device *obd = lut->lut_obd;
2704         struct ptlrpc_request *req;
2705         struct target_recovery_data *trd = &obd->obd_recovery_data;
2706         unsigned long delta;
2707         struct lu_env *env;
2708         struct ptlrpc_thread *thread = NULL;
2709         int rc = 0;
2710
2711         ENTRY;
2712         OBD_ALLOC_PTR(thread);
2713         if (thread == NULL)
2714                 RETURN(-ENOMEM);
2715
2716         OBD_ALLOC_PTR(env);
2717         if (env == NULL)
2718                 GOTO(out_thread, rc = -ENOMEM);
2719         rc = lu_env_add(env);
2720         if (rc)
2721                 GOTO(out_env, rc);
2722
2723         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2724         if (rc)
2725                 GOTO(out_env_remove, rc);
2726
2727         thread->t_env = env;
2728         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2729         thread->t_task = current;
2730         env->le_ctx.lc_thread = thread;
2731         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2732
2733         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2734                current->pid);
2735         trd->trd_processing_task = current->pid;
2736
2737         spin_lock(&obd->obd_dev_lock);
2738         obd->obd_recovering = 1;
2739         spin_unlock(&obd->obd_dev_lock);
2740         complete(&trd->trd_starting);
2741
2742         /* first of all, we have to know the first transno to replay */
2743         if (target_recovery_overseer(lut, check_for_recovery_ready,
2744                                      exp_connect_healthy)) {
2745                 abort_req_replay_queue(obd);
2746                 abort_lock_replay_queue(obd);
2747                 if (lut->lut_tdtd != NULL)
2748                         dtrq_list_destroy(lut->lut_tdtd);
2749         }
2750
2751         /* next stage: replay requests or update */
2752         delta = jiffies;
2753         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2754                atomic_read(&obd->obd_req_replay_clients),
2755                obd->obd_next_recovery_transno);
2756         replay_request_or_update(env, lut, trd, thread);
2757
2758         /**
2759          * The second stage: replay locks
2760          */
2761         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2762                atomic_read(&obd->obd_lock_replay_clients));
2763         while ((req = target_next_replay_lock(lut))) {
2764                 LASSERT(trd->trd_processing_task == current->pid);
2765                 DEBUG_REQ(D_HA, req, "processing lock from %s:",
2766                           libcfs_nid2str(req->rq_peer.nid));
2767                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_LOCK_REPLAY)) {
2768                         req->rq_status = -ENODEV;
2769                         target_request_copy_put(req);
2770                         continue;
2771                 }
2772                 handle_recovery_req(thread, req,
2773                                     trd->trd_recovery_handler);
2774                 target_request_copy_put(req);
2775                 obd->obd_replayed_locks++;
2776         }
2777
2778         /**
2779          * The third stage: reply on final pings, at this moment all clients
2780          * must have request in final queue
2781          */
2782         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2783         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2784         /** Update server last boot epoch */
2785         tgt_boot_epoch_update(lut);
2786         /*
2787          * We drop recoverying flag to forward all new requests
2788          * to regular mds_handle() since now
2789          */
2790         spin_lock(&obd->obd_dev_lock);
2791         obd->obd_recovering = obd->obd_abort_recovery = 0;
2792         spin_unlock(&obd->obd_dev_lock);
2793         spin_lock(&obd->obd_recovery_task_lock);
2794         target_cancel_recovery_timer(obd);
2795         spin_unlock(&obd->obd_recovery_task_lock);
2796         while ((req = target_next_final_ping(obd))) {
2797                 LASSERT(trd->trd_processing_task == current->pid);
2798                 DEBUG_REQ(D_HA, req, "processing final ping from %s:",
2799                           libcfs_nid2str(req->rq_peer.nid));
2800                 handle_recovery_req(thread, req,
2801                                     trd->trd_recovery_handler);
2802                 /*
2803                  * Because the waiting client can not send ping to server,
2804                  * so we need refresh the last_request_time, to avoid the
2805                  * export is being evicted
2806                  */
2807                 ptlrpc_update_export_timer(req->rq_export, 0);
2808                 target_request_copy_put(req);
2809         }
2810
2811         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2812         CDEBUG(D_INFO, "4: recovery completed in %lus - %d/%d reqs/locks\n",
2813                delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2814         if (delta > OBD_RECOVERY_TIME_SOFT) {
2815                 CWARN("too long recovery - read logs\n");
2816                 libcfs_debug_dumplog();
2817         }
2818
2819         target_finish_recovery(lut);
2820         lu_context_fini(&env->le_ctx);
2821         trd->trd_processing_task = 0;
2822         complete_all(&trd->trd_finishing);
2823         tgt_io_thread_done(thread);
2824 out_env_remove:
2825         lu_env_remove(env);
2826 out_env:
2827         OBD_FREE_PTR(env);
2828 out_thread:
2829         OBD_FREE_PTR(thread);
2830         RETURN(rc);
2831 }
2832
2833 static int target_start_recovery_thread(struct lu_target *lut,
2834                                         svc_handler_t handler)
2835 {
2836         struct obd_device *obd = lut->lut_obd;
2837         int rc = 0;
2838         struct target_recovery_data *trd = &obd->obd_recovery_data;
2839         int index;
2840
2841         memset(trd, 0, sizeof(*trd));
2842         init_completion(&trd->trd_starting);
2843         init_completion(&trd->trd_finishing);
2844         trd->trd_recovery_handler = handler;
2845
2846         rc = server_name2index(obd->obd_name, &index, NULL);
2847         if (rc < 0)
2848                 return rc;
2849
2850         if (!IS_ERR(kthread_run(target_recovery_thread,
2851                                 lut, "tgt_recover_%d", index))) {
2852                 wait_for_completion(&trd->trd_starting);
2853                 LASSERT(obd->obd_recovering != 0);
2854         } else {
2855                 rc = -ECHILD;
2856         }
2857
2858         return rc;
2859 }
2860
2861 void target_stop_recovery_thread(struct obd_device *obd)
2862 {
2863         if (obd->obd_recovery_data.trd_processing_task > 0) {
2864                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2865                 /** recovery can be done but postrecovery is not yet */
2866                 spin_lock(&obd->obd_dev_lock);
2867                 if (obd->obd_recovering) {
2868                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2869                         obd->obd_abort_recovery = 1;
2870                         wake_up(&obd->obd_next_transno_waitq);
2871                 }
2872                 spin_unlock(&obd->obd_dev_lock);
2873                 wait_for_completion(&trd->trd_finishing);
2874         }
2875 }
2876 EXPORT_SYMBOL(target_stop_recovery_thread);
2877
2878 void target_recovery_fini(struct obd_device *obd)
2879 {
2880         class_disconnect_exports(obd);
2881         target_stop_recovery_thread(obd);
2882         target_cleanup_recovery(obd);
2883 }
2884 EXPORT_SYMBOL(target_recovery_fini);
2885
2886 static enum hrtimer_restart target_recovery_expired(struct hrtimer *timer)
2887 {
2888         struct obd_device *obd = container_of(timer, struct obd_device,
2889                                               obd_recovery_timer);
2890
2891         CDEBUG(D_HA,
2892                "%s: recovery timed out; %d clients are still in recovery after %llu seconds (%d clients connected)\n",
2893                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2894                ktime_get_seconds() - obd->obd_recovery_start,
2895                atomic_read(&obd->obd_connected_clients));
2896
2897         obd->obd_recovery_expired = 1;
2898         wake_up(&obd->obd_next_transno_waitq);
2899         return HRTIMER_NORESTART;
2900 }
2901
2902 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2903 {
2904         struct obd_device *obd = lut->lut_obd;
2905
2906         if (lut->lut_bottom->dd_rdonly)
2907                 return;
2908
2909         if (atomic_read(&obd->obd_max_recoverable_clients) == 0) {
2910                 /** Update server last boot epoch */
2911                 tgt_boot_epoch_update(lut);
2912                 return;
2913         }
2914
2915         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2916                "last_transno %llu\n", obd->obd_name,
2917                atomic_read(&obd->obd_max_recoverable_clients),
2918                obd->obd_last_committed);
2919         LASSERT(obd->obd_stopping == 0);
2920         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2921         obd->obd_recovery_start = 0;
2922         obd->obd_recovery_end = 0;
2923
2924         hrtimer_init(&obd->obd_recovery_timer, CLOCK_MONOTONIC,
2925                      HRTIMER_MODE_ABS);
2926         obd->obd_recovery_timer.function = &target_recovery_expired;
2927         target_start_recovery_thread(lut, handler);
2928 }
2929 EXPORT_SYMBOL(target_recovery_init);
2930
2931 static int target_process_req_flags(struct obd_device *obd,
2932                                     struct ptlrpc_request *req)
2933 {
2934         struct obd_export *exp = req->rq_export;
2935
2936         LASSERT(exp != NULL);
2937         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2938                 /* client declares he's ready to replay locks */
2939                 spin_lock(&exp->exp_lock);
2940                 if (exp->exp_req_replay_needed) {
2941                         exp->exp_req_replay_needed = 0;
2942                         spin_unlock(&exp->exp_lock);
2943
2944                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2945                         atomic_dec(&obd->obd_req_replay_clients);
2946                 } else {
2947                         spin_unlock(&exp->exp_lock);
2948                 }
2949         }
2950         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2951                 /*
2952                  * client declares he's ready to complete recovery
2953                  * so, we put the request on th final queue
2954                  */
2955                 spin_lock(&exp->exp_lock);
2956                 if (exp->exp_lock_replay_needed) {
2957                         exp->exp_lock_replay_needed = 0;
2958                         spin_unlock(&exp->exp_lock);
2959
2960                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
2961                         atomic_dec(&obd->obd_lock_replay_clients);
2962                 } else {
2963                         spin_unlock(&exp->exp_lock);
2964                 }
2965         }
2966         return 0;
2967 }
2968
2969 int target_queue_recovery_request(struct ptlrpc_request *req,
2970                                   struct obd_device *obd)
2971 {
2972         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
2973         struct ptlrpc_request *reqiter;
2974         int inserted = 0;
2975
2976         ENTRY;
2977
2978         if (obd->obd_recovery_data.trd_processing_task == current->pid) {
2979                 /* Processing the queue right now, don't re-add. */
2980                 RETURN(1);
2981         }
2982
2983         target_process_req_flags(obd, req);
2984
2985         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2986                 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
2987                         if (cfs_fail_val == 1) {
2988                                 cfs_race_state = 1;
2989                                 cfs_fail_val = 0;
2990                                 wake_up(&cfs_race_waitq);
2991
2992                                 schedule_timeout_interruptible(
2993                                         cfs_time_seconds(1));
2994                         }
2995                 }
2996
2997                 /*
2998                  * client declares he's ready to complete recovery
2999                  * so, we put the request on th final queue
3000                  */
3001                 target_request_copy_get(req);
3002                 DEBUG_REQ(D_HA, req, "queue final req");
3003                 wake_up(&obd->obd_next_transno_waitq);
3004                 spin_lock(&obd->obd_recovery_task_lock);
3005                 if (obd->obd_recovering) {
3006                         struct ptlrpc_request *tmp;
3007                         struct ptlrpc_request *duplicate = NULL;
3008
3009                         if (likely(!req->rq_export->exp_replay_done)) {
3010                                 req->rq_export->exp_replay_done = 1;
3011                                 list_add_tail(&req->rq_list,
3012                                               &obd->obd_final_req_queue);
3013                                 spin_unlock(&obd->obd_recovery_task_lock);
3014                                 RETURN(0);
3015                         }
3016
3017                         /*
3018                          * XXX O(n), but only happens if final ping is
3019                          * timed out, probably reorganize the list as
3020                          * a hash list later
3021                          */
3022                         list_for_each_entry_safe(reqiter, tmp,
3023                                                  &obd->obd_final_req_queue,
3024                                                  rq_list) {
3025                                 if (reqiter->rq_export == req->rq_export) {
3026                                         list_del_init(&reqiter->rq_list);
3027                                         duplicate = reqiter;
3028                                         break;
3029                                 }
3030                         }
3031
3032                         list_add_tail(&req->rq_list,
3033                                       &obd->obd_final_req_queue);
3034                         req->rq_export->exp_replay_done = 1;
3035                         spin_unlock(&obd->obd_recovery_task_lock);
3036
3037                         if (duplicate != NULL) {
3038                                 DEBUG_REQ(D_HA, duplicate,
3039                                           "put prev final req");
3040                                 target_request_copy_put(duplicate);
3041                         }
3042                         RETURN(0);
3043                 } else {
3044                         spin_unlock(&obd->obd_recovery_task_lock);
3045                         target_request_copy_put(req);
3046                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
3047                 }
3048         }
3049         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
3050                 /* client declares he's ready to replay locks */
3051                 target_request_copy_get(req);
3052                 DEBUG_REQ(D_HA, req, "queue lock replay req");
3053                 wake_up(&obd->obd_next_transno_waitq);
3054                 spin_lock(&obd->obd_recovery_task_lock);
3055                 LASSERT(obd->obd_recovering);
3056                 /* usually due to recovery abort */
3057                 if (!req->rq_export->exp_in_recovery) {
3058                         spin_unlock(&obd->obd_recovery_task_lock);
3059                         target_request_copy_put(req);
3060                         RETURN(-ENOTCONN);
3061                 }
3062                 LASSERT(req->rq_export->exp_lock_replay_needed);
3063                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
3064                 spin_unlock(&obd->obd_recovery_task_lock);
3065                 RETURN(0);
3066         }
3067
3068         /*
3069          * CAVEAT EMPTOR: The incoming request message has been swabbed
3070          * (i.e. buflens etc are in my own byte order), but type-dependent
3071          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed.
3072          */
3073
3074         if (!transno) {
3075                 INIT_LIST_HEAD(&req->rq_list);
3076                 DEBUG_REQ(D_HA, req, "not queueing");
3077                 RETURN(1);
3078         }
3079
3080         /*
3081          * If we're processing the queue, we want don't want to queue this
3082          * message.
3083          *
3084          * Also, if this request has a transno less than the one we're waiting
3085          * for, we should process it now.  It could (and currently always will)
3086          * be an open request for a descriptor that was opened some time ago.
3087          *
3088          * Also, a resent, replayed request that has already been
3089          * handled will pass through here and be processed immediately.
3090          */
3091         CDEBUG(D_HA,
3092                "Next recovery transno: %llu, current: %llu, replaying\n",
3093                obd->obd_next_recovery_transno, transno);
3094
3095         /*
3096          * If the request has been replayed by update replay, then sends this
3097          * request to the recovery thread (replay_request_or_update()), where
3098          * it will be handled
3099          */
3100         spin_lock(&obd->obd_recovery_task_lock);
3101         if (transno < obd->obd_next_recovery_transno &&
3102             !is_req_replayed_by_update(req)) {
3103                 /* Processing the queue right now, don't re-add. */
3104                 LASSERT(list_empty(&req->rq_list));
3105                 spin_unlock(&obd->obd_recovery_task_lock);
3106                 RETURN(1);
3107         }
3108         spin_unlock(&obd->obd_recovery_task_lock);
3109
3110         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
3111                 RETURN(0);
3112
3113         target_request_copy_get(req);
3114         if (!req->rq_export->exp_in_recovery) {
3115                 target_request_copy_put(req);
3116                 RETURN(-ENOTCONN);
3117         }
3118         LASSERT(req->rq_export->exp_req_replay_needed);
3119
3120         if (target_exp_enqueue_req_replay(req)) {
3121                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
3122                 target_request_copy_put(req);
3123                 RETURN(0);
3124         }
3125
3126         /* XXX O(n^2) */
3127         spin_lock(&obd->obd_recovery_task_lock);
3128         LASSERT(obd->obd_recovering);
3129         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
3130                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
3131                         list_add_tail(&req->rq_list, &reqiter->rq_list);
3132                         inserted = 1;
3133                         goto added;
3134                 }
3135
3136                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
3137                              transno)) {
3138                         DEBUG_REQ(D_ERROR, req,
3139                                   "dropping replay: transno has been claimed by another client");
3140                         spin_unlock(&obd->obd_recovery_task_lock);
3141                         target_exp_dequeue_req_replay(req);
3142                         target_request_copy_put(req);
3143                         RETURN(0);
3144                 }
3145         }
3146 added:
3147         if (!inserted)
3148                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
3149
3150         obd->obd_requests_queued_for_recovery++;
3151         spin_unlock(&obd->obd_recovery_task_lock);
3152         wake_up(&obd->obd_next_transno_waitq);
3153         RETURN(0);
3154 }
3155
3156 void target_committed_to_req(struct ptlrpc_request *req)
3157 {
3158         struct obd_export *exp = req->rq_export;
3159
3160         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
3161                 lustre_msg_set_last_committed(req->rq_repmsg,
3162                                               exp->exp_last_committed);
3163         else
3164                 DEBUG_REQ(D_IOCTL, req,
3165                           "not sending last_committed update (%d/%d)",
3166                           exp->exp_obd->obd_no_transno,
3167                           req->rq_repmsg == NULL);
3168
3169         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
3170                exp->exp_last_committed, req->rq_transno, req->rq_xid);
3171 }
3172
3173 #endif /* HAVE_SERVER_SUPPORT */
3174
3175 /**
3176  * Packs current SLV and Limit into \a req.
3177  */
3178 int target_pack_pool_reply(struct ptlrpc_request *req)
3179 {
3180         struct obd_device *obd;
3181
3182         ENTRY;
3183
3184         /*
3185          * Check that we still have all structures alive as this may
3186          * be some late RPC at shutdown time.
3187          */
3188         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
3189                      !exp_connect_lru_resize(req->rq_export))) {
3190                 lustre_msg_set_slv(req->rq_repmsg, 0);
3191                 lustre_msg_set_limit(req->rq_repmsg, 0);
3192                 RETURN(0);
3193         }
3194
3195         /* OBD is alive here as export is alive, which we checked above. */
3196         obd = req->rq_export->exp_obd;
3197
3198         read_lock(&obd->obd_pool_lock);
3199         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
3200         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
3201         read_unlock(&obd->obd_pool_lock);
3202
3203         RETURN(0);
3204 }
3205
3206 static int target_send_reply_msg(struct ptlrpc_request *req,
3207                                  int rc, int fail_id)
3208 {
3209         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
3210                 DEBUG_REQ(D_ERROR, req, "dropping reply");
3211                 return -ECOMM;
3212         }
3213         /*
3214          * We can have a null rq_reqmsg in the event of bad signature or
3215          * no context when unwrapping
3216          */
3217         if (req->rq_reqmsg &&
3218             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
3219             OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
3220                 return -ECOMM;
3221
3222         if (unlikely(rc)) {
3223                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
3224                 req->rq_status = rc;
3225                 return ptlrpc_send_error(req, 1);
3226         }
3227         DEBUG_REQ(D_NET, req, "sending reply");
3228
3229         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
3230 }
3231
3232 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
3233 {
3234         struct ptlrpc_service_part *svcpt;
3235         int netrc;
3236         struct ptlrpc_reply_state *rs;
3237         struct obd_export *exp;
3238
3239         ENTRY;
3240
3241         if (req->rq_no_reply) {
3242                 EXIT;
3243                 return;
3244         }
3245
3246         svcpt = req->rq_rqbd->rqbd_svcpt;
3247         rs = req->rq_reply_state;
3248         if (rs == NULL || !rs->rs_difficult) {
3249                 /* no notifiers */
3250                 target_send_reply_msg(req, rc, fail_id);
3251                 EXIT;
3252                 return;
3253         }
3254
3255         /* must be an export if locks saved */
3256         LASSERT(req->rq_export != NULL);
3257         /* req/reply consistent */
3258         LASSERT(rs->rs_svcpt == svcpt);
3259
3260         /* "fresh" reply */
3261         LASSERT(!rs->rs_scheduled);
3262         LASSERT(!rs->rs_scheduled_ever);
3263         LASSERT(!rs->rs_handled);
3264         LASSERT(!rs->rs_on_net);
3265         LASSERT(rs->rs_export == NULL);
3266         LASSERT(list_empty(&rs->rs_obd_list));
3267         LASSERT(list_empty(&rs->rs_exp_list));
3268
3269         exp = class_export_get(req->rq_export);
3270
3271         /* disable reply scheduling while I'm setting up */
3272         rs->rs_scheduled = 1;
3273         rs->rs_on_net    = 1;
3274         rs->rs_xid       = req->rq_xid;
3275         rs->rs_transno   = req->rq_transno;
3276         rs->rs_export    = exp;
3277         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
3278
3279         spin_lock(&exp->exp_uncommitted_replies_lock);
3280         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
3281                rs->rs_transno, exp->exp_last_committed);
3282         if (rs->rs_transno > exp->exp_last_committed) {
3283                 /* not committed already */
3284                 list_add_tail(&rs->rs_obd_list,
3285                                   &exp->exp_uncommitted_replies);
3286         }
3287         spin_unlock(&exp->exp_uncommitted_replies_lock);
3288
3289         spin_lock(&exp->exp_lock);
3290         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
3291         spin_unlock(&exp->exp_lock);
3292
3293         netrc = target_send_reply_msg(req, rc, fail_id);
3294
3295         spin_lock(&svcpt->scp_rep_lock);
3296
3297         atomic_inc(&svcpt->scp_nreps_difficult);
3298
3299         if (netrc != 0) {
3300                 /*
3301                  * error sending: reply is off the net.  Also we need +1
3302                  * reply ref until ptlrpc_handle_rs() is done
3303                  * with the reply state (if the send was successful, there
3304                  * would have been +1 ref for the net, which
3305                  * reply_out_callback leaves alone)
3306                  */
3307                 rs->rs_on_net = 0;
3308                 ptlrpc_rs_addref(rs);
3309         }
3310
3311         spin_lock(&rs->rs_lock);
3312         if (rs->rs_transno <= exp->exp_last_committed ||
3313             (!rs->rs_on_net && !rs->rs_no_ack) ||
3314             list_empty(&rs->rs_exp_list) ||     /* completed already */
3315             list_empty(&rs->rs_obd_list)) {
3316                 CDEBUG(D_HA, "Schedule reply immediately\n");
3317                 ptlrpc_dispatch_difficult_reply(rs);
3318         } else {
3319                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
3320                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
3321         }
3322         spin_unlock(&rs->rs_lock);
3323         spin_unlock(&svcpt->scp_rep_lock);
3324         EXIT;
3325 }
3326
3327 enum ldlm_mode lck_compat_array[] = {
3328         [LCK_EX]    = LCK_COMPAT_EX,
3329         [LCK_PW]    = LCK_COMPAT_PW,
3330         [LCK_PR]    = LCK_COMPAT_PR,
3331         [LCK_CW]    = LCK_COMPAT_CW,
3332         [LCK_CR]    = LCK_COMPAT_CR,
3333         [LCK_NL]    = LCK_COMPAT_NL,
3334         [LCK_GROUP] = LCK_COMPAT_GROUP,
3335         [LCK_COS]   = LCK_COMPAT_COS,
3336 };
3337
3338 /**
3339  * Rather arbitrary mapping from LDLM error codes to errno values. This should
3340  * not escape to the user level.
3341  */
3342 int ldlm_error2errno(enum ldlm_error error)
3343 {
3344         int result;
3345
3346         switch (error) {
3347         case ELDLM_OK:
3348         case ELDLM_LOCK_MATCHED:
3349                 result = 0;
3350                 break;
3351         case ELDLM_LOCK_CHANGED:
3352                 result = -ESTALE;
3353                 break;
3354         case ELDLM_LOCK_ABORTED:
3355                 result = -ENAVAIL;
3356                 break;
3357         case ELDLM_LOCK_REPLACED:
3358                 result = -ESRCH;
3359                 break;
3360         case ELDLM_NO_LOCK_DATA:
3361                 result = -ENOENT;
3362                 break;
3363         case ELDLM_NAMESPACE_EXISTS:
3364                 result = -EEXIST;
3365                 break;
3366         case ELDLM_BAD_NAMESPACE:
3367                 result = -EBADF;
3368                 break;
3369         default:
3370                 if (((int)error) < 0) { /* cast to signed type */
3371                         result = error; /* as ldlm_error can be unsigned */
3372                 } else {
3373                         CERROR("Invalid DLM result code: %d\n", error);
3374                         result = -EPROTO;
3375                 }
3376         }
3377         return result;
3378 }
3379 EXPORT_SYMBOL(ldlm_error2errno);
3380
3381 /**
3382  * Dual to ldlm_error2errno(): maps errno values back to enum ldlm_error.
3383  */
3384 enum ldlm_error ldlm_errno2error(int err_no)
3385 {
3386         int error;
3387
3388         switch (err_no) {
3389         case 0:
3390                 error = ELDLM_OK;
3391                 break;
3392         case -ESTALE:
3393                 error = ELDLM_LOCK_CHANGED;
3394                 break;
3395         case -ENAVAIL:
3396                 error = ELDLM_LOCK_ABORTED;
3397                 break;
3398         case -ESRCH:
3399                 error = ELDLM_LOCK_REPLACED;
3400                 break;
3401         case -ENOENT:
3402                 error = ELDLM_NO_LOCK_DATA;
3403                 break;
3404         case -EEXIST:
3405                 error = ELDLM_NAMESPACE_EXISTS;
3406                 break;
3407         case -EBADF:
3408                 error = ELDLM_BAD_NAMESPACE;
3409                 break;
3410         default:
3411                 error = err_no;
3412         }
3413         return error;
3414 }
3415
3416 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3417 void ldlm_dump_export_locks(struct obd_export *exp)
3418 {
3419         spin_lock(&exp->exp_locks_list_guard);
3420         if (!list_empty(&exp->exp_locks_list)) {
3421                 struct ldlm_lock *lock;
3422
3423                 CERROR("dumping locks for export %p, ignore if the unmount doesn't hang\n",
3424                        exp);
3425                 list_for_each_entry(lock, &exp->exp_locks_list,
3426                                         l_exp_refs_link)
3427                         LDLM_ERROR(lock, "lock:");
3428         }
3429         spin_unlock(&exp->exp_locks_list_guard);
3430 }
3431 #endif
3432
3433 #ifdef HAVE_SERVER_SUPPORT
3434 static inline const char *bulk2type(struct ptlrpc_request *req)
3435 {
3436         if (req->rq_bulk_read)
3437                 return "READ";
3438         if (req->rq_bulk_write)
3439                 return "WRITE";
3440         return "UNKNOWN";
3441 }
3442
3443 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc)
3444 {
3445         struct ptlrpc_request *req = desc->bd_req;
3446         time64_t start = ktime_get_seconds();
3447         time64_t deadline;
3448         int rc = 0;
3449
3450         ENTRY;
3451
3452         /* If there is eviction in progress, wait for it to finish. */
3453         wait_event_idle(
3454                 exp->exp_obd->obd_evict_inprogress_waitq,
3455                 !atomic_read(&exp->exp_obd->obd_evict_inprogress));
3456
3457         /* Check if client was evicted or reconnected already. */
3458         if (exp->exp_failed ||
3459             exp->exp_conn_cnt > lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3460                 rc = -ENOTCONN;
3461         } else {
3462                 if (req->rq_bulk_read)
3463                         rc = sptlrpc_svc_wrap_bulk(req, desc);
3464
3465                 if (OCD_HAS_FLAG(&exp->exp_connect_data, BULK_MBITS))
3466                         req->rq_mbits = lustre_msg_get_mbits(req->rq_reqmsg);
3467                 else /* old version, bulk matchbits is rq_xid */
3468                         req->rq_mbits = req->rq_xid;
3469
3470                 if (rc == 0)
3471                         rc = ptlrpc_start_bulk_transfer(desc);
3472         }
3473
3474         if (rc < 0) {
3475                 DEBUG_REQ(D_ERROR, req, "bulk %s failed: rc = %d",
3476                           bulk2type(req), rc);
3477                 RETURN(rc);
3478         }
3479
3480         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
3481                 ptlrpc_abort_bulk(desc);
3482                 RETURN(0);
3483         }
3484
3485         /* limit actual bulk transfer to bulk_timeout seconds */
3486         deadline = start + bulk_timeout;
3487         if (deadline > req->rq_deadline)
3488                 deadline = req->rq_deadline;
3489
3490         do {
3491                 time64_t timeoutl = deadline - ktime_get_seconds();
3492                 time64_t rq_deadline;
3493
3494                 while (timeoutl >= 0 &&
3495                        wait_event_idle_timeout(
3496                                desc->bd_waitq,
3497                                !ptlrpc_server_bulk_active(desc) ||
3498                                exp->exp_failed ||
3499                                exp->exp_conn_cnt >
3500                                lustre_msg_get_conn_cnt(req->rq_reqmsg),
3501                                timeoutl ? cfs_time_seconds(1) : 1) == 0)
3502                         timeoutl -= 1;
3503                 rc = timeoutl < 0 ? -ETIMEDOUT : 0;
3504
3505                 /* Wait again if we changed rq_deadline. */
3506                 rq_deadline = READ_ONCE(req->rq_deadline);
3507                 deadline = start + bulk_timeout;
3508                 if (deadline > rq_deadline)
3509                         deadline = rq_deadline;
3510         } while (rc == -ETIMEDOUT &&
3511                  deadline > ktime_get_seconds());
3512
3513         if (rc == -ETIMEDOUT) {
3514                 DEBUG_REQ(D_ERROR, req, "timeout on bulk %s after %lld%+llds",
3515                           bulk2type(req), deadline - start,
3516                           ktime_get_real_seconds() - deadline);
3517                 ptlrpc_abort_bulk(desc);
3518         } else if (exp->exp_failed) {
3519                 DEBUG_REQ(D_ERROR, req, "Eviction on bulk %s",
3520                           bulk2type(req));
3521                 rc = -ENOTCONN;
3522                 ptlrpc_abort_bulk(desc);
3523         } else if (exp->exp_conn_cnt >
3524                    lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3525                 DEBUG_REQ(D_ERROR, req, "Reconnect on bulk %s",
3526                           bulk2type(req));
3527                 /* We don't reply anyway. */
3528                 rc = -ETIMEDOUT;
3529                 ptlrpc_abort_bulk(desc);
3530         } else if (desc->bd_failure) {
3531                 DEBUG_REQ(D_ERROR, req, "network error on bulk %s",
3532                           bulk2type(req));
3533                 /* XXX should this be a different errno? */
3534                 rc = -ETIMEDOUT;
3535         } else {
3536                 if (req->rq_bulk_write)
3537                         rc = sptlrpc_svc_unwrap_bulk(req, desc);
3538                 if (rc == 0 && desc->bd_nob_transferred != desc->bd_nob) {
3539                         DEBUG_REQ(D_ERROR, req, "truncated bulk %s %d(%d)",
3540                                   bulk2type(req), desc->bd_nob_transferred,
3541                                   desc->bd_nob);
3542                         /* XXX should this be a different errno? */
3543                         rc = -ETIMEDOUT;
3544                 }
3545         }
3546
3547         RETURN(rc);
3548 }
3549 EXPORT_SYMBOL(target_bulk_io);
3550
3551 #endif /* HAVE_SERVER_SUPPORT */