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/fs_struct.h>
  43 #include <linux/jiffies.h>
  44 #include <linux/kernel.h>
  45 #include <linux/kthread.h>
  46 #include <libcfs/libcfs.h>
  47 #include <obd.h>
  48 #include <obd_class.h>
  49 #include <lustre_dlm.h>
  50 #include <lustre_net.h>
  51 #include <lustre_sec.h>
  52 #include "ldlm_internal.h"
  53
  54 /*
  55  * @priority: If non-zero, move the selected connection to the list head.
  56  * @create: If zero, only search in existing connections.
  57  */
  58 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  59                            int priority, int create)
  60 {
  61         struct ptlrpc_connection *ptlrpc_conn;
  62         struct obd_import_conn *imp_conn = NULL, *item;
  63         u32 refnet = LNET_NET_ANY;
  64         int rc = 0;
  65
  66         ENTRY;
  67
  68         if (!create && !priority) {
  69                 CDEBUG(D_HA, "Nothing to do\n");
  70                 RETURN(-EINVAL);
  71         }
  72
  73         if (imp->imp_connection &&
  74             imp->imp_connection->c_remote_uuid.uuid[0] == 0)
  75                 /* refnet is used to restrict network connections */
  76                 refnet = LNET_NID_NET(&imp->imp_connection->c_self);
  77         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, refnet);
  78         if (!ptlrpc_conn) {
  79                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  80                 RETURN(-ENOENT);
  81         }
  82
  83         if (create) {
  84                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  85                 if (!imp_conn)
  86                         GOTO(out_put, rc = -ENOMEM);
  87         }
  88
  89         spin_lock(&imp->imp_lock);
  90         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  91                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  92                         if (priority) {
  93                                 list_move(&item->oic_item,
  94                                           &imp->imp_conn_list);
  95                                 item->oic_last_attempt = 0;
  96                         }
  97                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  98                                imp, imp->imp_obd->obd_name, uuid->uuid,
  99                                (priority ? ", moved to head" : ""));
 100                         spin_unlock(&imp->imp_lock);
 101                         GOTO(out_free, rc = 0);
 102                 }
 103         }
 104         /* No existing import connection found for \a uuid. */
 105         if (create) {
 106                 imp_conn->oic_conn = ptlrpc_conn;
 107                 imp_conn->oic_uuid = *uuid;
 108                 imp_conn->oic_last_attempt = 0;
 109                 if (priority)
 110                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 111                 else
 112                         list_add_tail(&imp_conn->oic_item,
 113                                       &imp->imp_conn_list);
 114                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 115                        imp, imp->imp_obd->obd_name, uuid->uuid,
 116                        (priority ? "head" : "tail"));
 117         } else {
 118                 spin_unlock(&imp->imp_lock);
 119                 GOTO(out_free, rc = -ENOENT);
 120         }
 121
 122         spin_unlock(&imp->imp_lock);
 123         RETURN(0);
 124 out_free:
 125         if (imp_conn)
 126                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 127 out_put:
 128         ptlrpc_connection_put(ptlrpc_conn);
 129         RETURN(rc);
 130 }
 131
 132 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 133 {
 134         return import_set_conn(imp, uuid, 1, 0);
 135 }
 136
 137 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 138                            int priority)
 139 {
 140         return import_set_conn(imp, uuid, priority, 1);
 141 }
 142 EXPORT_SYMBOL(client_import_add_conn);
 143
 144 int client_import_dyn_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 145                                lnet_nid_t prim_nid, int priority)
 146 {
 147         struct ptlrpc_connection *ptlrpc_conn;
 148         int rc;
 149
 150         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, LNET_NIDNET(prim_nid));
 151         if (!ptlrpc_conn) {
 152                 const char *str_uuid = obd_uuid2str(uuid);
 153
 154                 rc = class_add_uuid(str_uuid, prim_nid);
 155                 if (rc) {
 156                         CERROR("%s: failed to add UUID '%s': rc = %d\n",
 157                                imp->imp_obd->obd_name, str_uuid, rc);
 158                         return rc;
 159                 }
 160         }
 161         return import_set_conn(imp, uuid, priority, 1);
 162 }
 163 EXPORT_SYMBOL(client_import_dyn_add_conn);
 164
 165 int client_import_add_nids_to_conn(struct obd_import *imp, lnet_nid_t *nids,
 166                                    int nid_count, struct obd_uuid *uuid)
 167 {
 168         struct obd_import_conn *conn;
 169         int rc = -ENOENT;
 170
 171         ENTRY;
 172         if (nid_count <= 0 || !nids)
 173                 return rc;
 174
 175         spin_lock(&imp->imp_lock);
 176         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 177                 if (class_check_uuid(&conn->oic_uuid, nids[0])) {
 178                         *uuid = conn->oic_uuid;
 179                         spin_unlock(&imp->imp_lock);
 180                         rc = class_add_nids_to_uuid(&conn->oic_uuid, nids,
 181                                                     nid_count);
 182                         RETURN(rc);
 183                 }
 184         }
 185         spin_unlock(&imp->imp_lock);
 186         RETURN(rc);
 187 }
 188 EXPORT_SYMBOL(client_import_add_nids_to_conn);
 189
 190 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 191 {
 192         struct obd_import_conn *imp_conn;
 193         struct obd_export *dlmexp;
 194         int rc = -ENOENT;
 195
 196         ENTRY;
 197
 198         spin_lock(&imp->imp_lock);
 199         if (list_empty(&imp->imp_conn_list)) {
 200                 LASSERT(!imp->imp_connection);
 201                 GOTO(out, rc);
 202         }
 203
 204         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 205                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 206                         continue;
 207                 LASSERT(imp_conn->oic_conn);
 208
 209                 if (imp_conn == imp->imp_conn_current) {
 210                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 211
 212                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 213                             imp->imp_state != LUSTRE_IMP_DISCON) {
 214                                 CERROR("can't remove current connection\n");
 215                                 GOTO(out, rc = -EBUSY);
 216                         }
 217
 218                         ptlrpc_connection_put(imp->imp_connection);
 219                         imp->imp_connection = NULL;
 220
 221                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 222                         if (dlmexp && dlmexp->exp_connection) {
 223                                 LASSERT(dlmexp->exp_connection ==
 224                                         imp_conn->oic_conn);
 225                                 ptlrpc_connection_put(dlmexp->exp_connection);
 226                                 dlmexp->exp_connection = NULL;
 227                         }
 228
 229                         if (dlmexp != NULL)
 230                                 class_export_put(dlmexp);
 231                 }
 232
 233                 list_del(&imp_conn->oic_item);
 234                 ptlrpc_connection_put(imp_conn->oic_conn);
 235                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 236                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 237                        imp, imp->imp_obd->obd_name, uuid->uuid);
 238                 rc = 0;
 239                 break;
 240         }
 241 out:
 242         spin_unlock(&imp->imp_lock);
 243         if (rc == -ENOENT)
 244                 CERROR("connection %s not found\n", uuid->uuid);
 245         RETURN(rc);
 246 }
 247 EXPORT_SYMBOL(client_import_del_conn);
 248
 249 /**
 250  * Find conn UUID by peer NID. \a peer is a server NID. This function is used
 251  * to find a conn uuid of \a imp which can reach \a peer.
 252  */
 253 int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
 254                             struct obd_uuid *uuid)
 255 {
 256         struct obd_import_conn *conn;
 257         int rc = -ENOENT;
 258
 259         ENTRY;
 260
 261         spin_lock(&imp->imp_lock);
 262         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 263                 /* Check if conn UUID does have this peer NID. */
 264                 if (class_check_uuid(&conn->oic_uuid, peer)) {
 265                         *uuid = conn->oic_uuid;
 266                         rc = 0;
 267                         break;
 268                 }
 269         }
 270         spin_unlock(&imp->imp_lock);
 271         RETURN(rc);
 272 }
 273 EXPORT_SYMBOL(client_import_find_conn);
 274
 275 void client_destroy_import(struct obd_import *imp)
 276 {
 277         /*
 278          * Drop security policy instance after all RPCs have finished/aborted
 279          * to let all busy contexts be released.
 280          */
 281         class_import_get(imp);
 282         class_destroy_import(imp);
 283         sptlrpc_import_sec_put(imp);
 284         class_import_put(imp);
 285 }
 286 EXPORT_SYMBOL(client_destroy_import);
 287
 288 /**
 289  * Check whether or not the OSC is on MDT.
 290  * In the config log,
 291  * osc on MDT
 292  *      setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
 293  * osc on client
 294  *      setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
 295  *
 296  **/
 297 static int osc_on_mdt(char *obdname)
 298 {
 299         char *ptr;
 300
 301         ptr = strrchr(obdname, '-');
 302         if (ptr == NULL)
 303                 return 0;
 304
 305         if (strncmp(ptr + 1, "MDT", 3) == 0)
 306                 return 1;
 307
 308         return 0;
 309 }
 310
 311 /*
 312  * Configure an RPC client OBD device.
 313  *
 314  * lcfg parameters:
 315  * 1 - client UUID
 316  * 2 - server UUID
 317  * 3 - inactive-on-startup
 318  * 4 - restrictive net
 319  */
 320 int client_obd_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 321 {
 322         struct client_obd *cli = &obd->u.cli;
 323         struct obd_import *imp;
 324         struct obd_uuid server_uuid;
 325         int rq_portal, rp_portal, connect_op;
 326         const char *name = obd->obd_type->typ_name;
 327         enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
 328         char *cli_name = lustre_cfg_buf(lcfg, 0);
 329         struct ptlrpc_connection fake_conn = { .c_self = {},
 330                                                .c_remote_uuid.uuid[0] = 0 };
 331         int rc;
 332
 333         ENTRY;
 334
 335         /*
 336          * In a more perfect world, we would hang a ptlrpc_client off of
 337          * obd_type and just use the values from there.
 338          */
 339         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 340                 rq_portal = OST_REQUEST_PORTAL;
 341                 rp_portal = OSC_REPLY_PORTAL;
 342                 connect_op = OST_CONNECT;
 343                 cli->cl_sp_me = LUSTRE_SP_CLI;
 344                 cli->cl_sp_to = LUSTRE_SP_OST;
 345                 ns_type = LDLM_NS_TYPE_OSC;
 346         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
 347                    !strcmp(name, LUSTRE_LWP_NAME)) {
 348                 rq_portal = MDS_REQUEST_PORTAL;
 349                 rp_portal = MDC_REPLY_PORTAL;
 350                 connect_op = MDS_CONNECT;
 351                 if (is_lwp_on_ost(cli_name))
 352                         cli->cl_sp_me = LUSTRE_SP_OST;
 353                 else if (is_lwp_on_mdt(cli_name))
 354                         cli->cl_sp_me = LUSTRE_SP_MDT;
 355                 else
 356                         cli->cl_sp_me = LUSTRE_SP_CLI;
 357                 cli->cl_sp_to = LUSTRE_SP_MDT;
 358                 ns_type = LDLM_NS_TYPE_MDC;
 359         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
 360                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
 361                         /* OSP_on_MDT for other MDTs */
 362                         connect_op = MDS_CONNECT;
 363                         cli->cl_sp_to = LUSTRE_SP_MDT;
 364                         ns_type = LDLM_NS_TYPE_MDC;
 365                         rq_portal = OUT_PORTAL;
 366                 } else {
 367                         /* OSP on MDT for OST */
 368                         connect_op = OST_CONNECT;
 369                         cli->cl_sp_to = LUSTRE_SP_OST;
 370                         ns_type = LDLM_NS_TYPE_OSC;
 371                         rq_portal = OST_REQUEST_PORTAL;
 372                 }
 373                 rp_portal = OSC_REPLY_PORTAL;
 374                 cli->cl_sp_me = LUSTRE_SP_MDT;
 375         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 376                 rq_portal = MGS_REQUEST_PORTAL;
 377                 rp_portal = MGC_REPLY_PORTAL;
 378                 connect_op = MGS_CONNECT;
 379                 cli->cl_sp_me = LUSTRE_SP_MGC;
 380                 cli->cl_sp_to = LUSTRE_SP_MGS;
 381                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 382                 ns_type = LDLM_NS_TYPE_MGC;
 383         } else {
 384                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 385                        name);
 386                 RETURN(-EINVAL);
 387         }
 388
 389         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 390                 CERROR("requires a TARGET UUID\n");
 391                 RETURN(-EINVAL);
 392         }
 393
 394         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 395                 CERROR("client UUID must be less than 38 characters\n");
 396                 RETURN(-EINVAL);
 397         }
 398
 399         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 400                 CERROR("setup requires a SERVER UUID\n");
 401                 RETURN(-EINVAL);
 402         }
 403
 404         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 405                 CERROR("target UUID must be less than 38 characters\n");
 406                 RETURN(-EINVAL);
 407         }
 408
 409         init_rwsem(&cli->cl_sem);
 410         mutex_init(&cli->cl_mgc_mutex);
 411         cli->cl_seq = NULL;
 412         init_rwsem(&cli->cl_seq_rwsem);
 413         cli->cl_conn_count = 0;
 414         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 415                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 416                      sizeof(server_uuid)));
 417
 418         cli->cl_dirty_pages = 0;
 419         cli->cl_dirty_max_pages = 0;
 420         cli->cl_avail_grant = 0;
 421         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
 422         /*
 423          * cl_dirty_max_pages may be changed at connect time in
 424          * ptlrpc_connect_interpret().
 425          */
 426         client_adjust_max_dirty(cli);
 427         init_waitqueue_head(&cli->cl_cache_waiters);
 428         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 429         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 430         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 431         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 432         spin_lock_init(&cli->cl_loi_list_lock);
 433         atomic_set(&cli->cl_pending_w_pages, 0);
 434         atomic_set(&cli->cl_pending_r_pages, 0);
 435         cli->cl_r_in_flight = 0;
 436         cli->cl_w_in_flight = 0;
 437
 438         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 439         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 440         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 441         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 442         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 443         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 444
 445         /* lru for osc. */
 446         INIT_LIST_HEAD(&cli->cl_lru_osc);
 447         atomic_set(&cli->cl_lru_shrinkers, 0);
 448         atomic_long_set(&cli->cl_lru_busy, 0);
 449         atomic_long_set(&cli->cl_lru_in_list, 0);
 450         INIT_LIST_HEAD(&cli->cl_lru_list);
 451         spin_lock_init(&cli->cl_lru_list_lock);
 452         atomic_long_set(&cli->cl_unstable_count, 0);
 453         INIT_LIST_HEAD(&cli->cl_shrink_list);
 454         INIT_LIST_HEAD(&cli->cl_grant_chain);
 455
 456         INIT_LIST_HEAD(&cli->cl_flight_waiters);
 457         cli->cl_rpcs_in_flight = 0;
 458
 459         init_waitqueue_head(&cli->cl_destroy_waitq);
 460         atomic_set(&cli->cl_destroy_in_flight, 0);
 461
 462
 463         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 464         cli->cl_preferred_cksum_type = 0;
 465 #ifdef ENABLE_CHECKSUM
 466         /* Turn on checksumming by default. */
 467         cli->cl_checksum = 1;
 468         /*
 469          * The supported checksum types will be worked out at connect time
 470          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 471          * through procfs.
 472          */
 473         cli->cl_cksum_type = cli->cl_supp_cksum_types;
 474 #endif
 475         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 476
 477         /*
 478          * Set it to possible maximum size. It may be reduced by ocd_brw_size
 479          * from OFD after connecting.
 480          */
 481         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 482
 483         cli->cl_max_short_io_bytes = OBD_DEF_SHORT_IO_BYTES;
 484
 485         /*
 486          * set cl_chunkbits default value to PAGE_SHIFT,
 487          * it will be updated at OSC connection time.
 488          */
 489         cli->cl_chunkbits = PAGE_SHIFT;
 490
 491         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 492                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 493         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
 494                 cli->cl_max_rpcs_in_flight = 2;
 495         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
 496                 cli->cl_max_rpcs_in_flight = 3;
 497         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
 498                 cli->cl_max_rpcs_in_flight = 4;
 499         } else {
 500                 if (osc_on_mdt(obd->obd_name))
 501                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
 502                 else
 503                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 504         }
 505
 506         spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
 507         cli->cl_max_mod_rpcs_in_flight = 0;
 508         cli->cl_mod_rpcs_in_flight = 0;
 509         cli->cl_close_rpcs_in_flight = 0;
 510         init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
 511         cli->cl_mod_tag_bitmap = NULL;
 512
 513         INIT_LIST_HEAD(&cli->cl_chg_dev_linkage);
 514
 515         if (connect_op == MDS_CONNECT) {
 516                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
 517                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
 518                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 519                 if (cli->cl_mod_tag_bitmap == NULL)
 520                         GOTO(err, rc = -ENOMEM);
 521         }
 522
 523         rc = ldlm_get_ref();
 524         if (rc) {
 525                 CERROR("ldlm_get_ref failed: %d\n", rc);
 526                 GOTO(err, rc);
 527         }
 528
 529         ptlrpc_init_client(rq_portal, rp_portal, name,
 530                            &obd->obd_ldlm_client);
 531
 532         imp = class_new_import(obd);
 533         if (imp == NULL)
 534                 GOTO(err_ldlm, rc = -ENOENT);
 535         imp->imp_client = &obd->obd_ldlm_client;
 536         imp->imp_connect_op = connect_op;
 537         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 538                LUSTRE_CFG_BUFLEN(lcfg, 1));
 539         class_import_put(imp);
 540
 541         if (lustre_cfg_buf(lcfg, 4)) {
 542                 __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
 543
 544                 if (refnet == LNET_NET_ANY) {
 545                         rc = -EINVAL;
 546                         CERROR("%s: bad mount option 'network=%s': rc = %d\n",
 547                                obd->obd_name, lustre_cfg_string(lcfg, 4),
 548                                rc);
 549                         GOTO(err_import, rc);
 550                 }
 551                 lnet_nid4_to_nid(LNET_MKNID(refnet, 0), &fake_conn.c_self);
 552                 imp->imp_connection = &fake_conn;
 553         }
 554
 555         rc = client_import_add_conn(imp, &server_uuid, 1);
 556         if (rc) {
 557                 CERROR("can't add initial connection\n");
 558                 GOTO(err_import, rc);
 559         }
 560         imp->imp_connection = NULL;
 561
 562         cli->cl_import = imp;
 563         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
 564         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 565
 566         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 567                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 568                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 569                                name, obd->obd_name,
 570                                cli->cl_target_uuid.uuid);
 571                         spin_lock(&imp->imp_lock);
 572                         imp->imp_deactive = 1;
 573                         spin_unlock(&imp->imp_lock);
 574                 }
 575         }
 576
 577         obd->obd_namespace = ldlm_namespace_new(obd, obd->obd_name,
 578                                                 LDLM_NAMESPACE_CLIENT,
 579                                                 LDLM_NAMESPACE_GREEDY,
 580                                                 ns_type);
 581         if (IS_ERR(obd->obd_namespace)) {
 582                 rc = PTR_ERR(obd->obd_namespace);
 583                 CERROR("%s: unable to create client namespace: rc = %d\n",
 584                        obd->obd_name, rc);
 585                 obd->obd_namespace = NULL;
 586                 GOTO(err_import, rc);
 587         }
 588
 589         RETURN(rc);
 590
 591 err_import:
 592         class_destroy_import(imp);
 593 err_ldlm:
 594         ldlm_put_ref();
 595 err:
 596         if (cli->cl_mod_tag_bitmap != NULL)
 597                 OBD_FREE(cli->cl_mod_tag_bitmap,
 598                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 599         cli->cl_mod_tag_bitmap = NULL;
 600
 601         RETURN(rc);
 602 }
 603 EXPORT_SYMBOL(client_obd_setup);
 604
 605 int client_obd_cleanup(struct obd_device *obd)
 606 {
 607         struct client_obd *cli = &obd->u.cli;
 608
 609         ENTRY;
 610
 611         ldlm_namespace_free_post(obd->obd_namespace);
 612         obd->obd_namespace = NULL;
 613
 614         obd_cleanup_client_import(obd);
 615         LASSERT(obd->u.cli.cl_import == NULL);
 616
 617         ldlm_put_ref();
 618
 619         if (cli->cl_mod_tag_bitmap != NULL)
 620                 OBD_FREE(cli->cl_mod_tag_bitmap,
 621                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 622         cli->cl_mod_tag_bitmap = NULL;
 623
 624         RETURN(0);
 625 }
 626 EXPORT_SYMBOL(client_obd_cleanup);
 627
 628 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 629 int client_connect_import(const struct lu_env *env,
 630                           struct obd_export **exp,
 631                           struct obd_device *obd, struct obd_uuid *cluuid,
 632                           struct obd_connect_data *data, void *localdata)
 633 {
 634         struct client_obd *cli = &obd->u.cli;
 635         struct obd_import *imp = cli->cl_import;
 636         struct obd_connect_data *ocd;
 637         struct lustre_handle conn = { 0 };
 638         int rc;
 639
 640         ENTRY;
 641
 642         *exp = NULL;
 643         down_write(&cli->cl_sem);
 644         if (cli->cl_conn_count > 0)
 645                 GOTO(out_sem, rc = -EALREADY);
 646
 647         rc = class_connect(&conn, obd, cluuid);
 648         if (rc)
 649                 GOTO(out_sem, rc);
 650
 651         cli->cl_conn_count++;
 652         *exp = class_conn2export(&conn);
 653
 654         LASSERT(obd->obd_namespace);
 655
 656         spin_lock(&imp->imp_lock);
 657         if (imp->imp_state == LUSTRE_IMP_CLOSED && imp->imp_deactive) {
 658                 /* need to reactivate import if trying to connect
 659                  * to a previously disconnected
 660                  */
 661                 imp->imp_deactive = 0;
 662                 imp->imp_invalid = 0;
 663         }
 664         spin_unlock(&imp->imp_lock);
 665
 666         imp->imp_dlm_handle = conn;
 667         rc = ptlrpc_init_import(imp);
 668         if (rc != 0)
 669                 GOTO(out_ldlm, rc);
 670
 671         ocd = &imp->imp_connect_data;
 672         if (data) {
 673                 *ocd = *data;
 674                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 675                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
 676         }
 677
 678         rc = ptlrpc_connect_import(imp);
 679         if (rc != 0) {
 680                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 681                 GOTO(out_ldlm, rc);
 682         }
 683         LASSERT(*exp != NULL && (*exp)->exp_connection);
 684
 685         if (data) {
 686                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 687                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 688                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 689                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 690                 data->ocd_connect_flags2 = ocd->ocd_connect_flags2;
 691         }
 692
 693         ptlrpc_pinger_add_import(imp);
 694
 695         EXIT;
 696
 697         if (rc) {
 698 out_ldlm:
 699                 cli->cl_conn_count--;
 700                 class_disconnect(*exp);
 701                 *exp = NULL;
 702         }
 703 out_sem:
 704         up_write(&cli->cl_sem);
 705
 706         if (!rc && localdata && !cli->cl_cache) {
 707                 cli->cl_cache = (struct cl_client_cache *)localdata;
 708                 cl_cache_incref(cli->cl_cache);
 709                 cli->cl_lru_left = &cli->cl_cache->ccc_lru_left;
 710
 711                 /* add this osc into entity list */
 712                 LASSERT(list_empty(&cli->cl_lru_osc));
 713                 spin_lock(&cli->cl_cache->ccc_lru_lock);
 714                 list_add(&cli->cl_lru_osc, &cli->cl_cache->ccc_lru);
 715                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
 716         }
 717
 718         return rc;
 719 }
 720 EXPORT_SYMBOL(client_connect_import);
 721
 722 int client_disconnect_export(struct obd_export *exp)
 723 {
 724         struct obd_device *obd = class_exp2obd(exp);
 725         struct client_obd *cli;
 726         struct obd_import *imp;
 727         int rc = 0, err;
 728
 729         ENTRY;
 730
 731         if (!obd) {
 732                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 733                        exp, exp ? exp->exp_handle.h_cookie : -1);
 734                 RETURN(-EINVAL);
 735         }
 736
 737         cli = &obd->u.cli;
 738         imp = cli->cl_import;
 739
 740         down_write(&cli->cl_sem);
 741         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
 742                 cli->cl_conn_count);
 743
 744         if (cli->cl_conn_count == 0) {
 745                 CERROR("disconnecting disconnected device (%s)\n",
 746                        obd->obd_name);
 747                 GOTO(out_disconnect, rc = -EINVAL);
 748         }
 749
 750         cli->cl_conn_count--;
 751         if (cli->cl_conn_count != 0)
 752                 GOTO(out_disconnect, rc = 0);
 753
 754         /*
 755          * Mark import deactivated now, so we don't try to reconnect if any
 756          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 757          * fully deactivate the import, or that would drop all requests.
 758          */
 759         spin_lock(&imp->imp_lock);
 760         imp->imp_deactive = 1;
 761         spin_unlock(&imp->imp_lock);
 762
 763         /*
 764          * Some non-replayable imports (MDS's OSCs) are pinged, so just
 765          * delete it regardless.  (It's safe to delete an import that was
 766          * never added.)
 767          */
 768         (void)ptlrpc_pinger_del_import(imp);
 769
 770         if (obd->obd_namespace != NULL) {
 771                 /* obd_force == local only */
 772                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 773                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 774                 ldlm_namespace_free_prior(obd->obd_namespace, imp,
 775                                           obd->obd_force);
 776         }
 777
 778         /*
 779          * There's no need to hold sem while disconnecting an import,
 780          * and it may actually cause deadlock in GSS.
 781          */
 782         up_write(&cli->cl_sem);
 783         rc = ptlrpc_disconnect_import(imp, 0);
 784         down_write(&cli->cl_sem);
 785
 786         ptlrpc_invalidate_import(imp);
 787
 788         EXIT;
 789
 790 out_disconnect:
 791         /*
 792          * Use server style - class_disconnect should be always called for
 793          * o_disconnect.
 794          */
 795         err = class_disconnect(exp);
 796         if (!rc && err)
 797                 rc = err;
 798
 799         up_write(&cli->cl_sem);
 800
 801         RETURN(rc);
 802 }
 803 EXPORT_SYMBOL(client_disconnect_export);
 804
 805 #ifdef HAVE_SERVER_SUPPORT
 806 int server_disconnect_export(struct obd_export *exp)
 807 {
 808         int rc;
 809
 810         ENTRY;
 811
 812         /* Disconnect early so that clients can't keep using export. */
 813         rc = class_disconnect(exp);
 814         /* Close import to avoid sending any requests. */
 815         if (exp->exp_imp_reverse)
 816                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 817
 818         ldlm_bl_thread_wakeup();
 819
 820         /* complete all outstanding replies */
 821         spin_lock(&exp->exp_lock);
 822         while (!list_empty(&exp->exp_outstanding_replies)) {
 823                 struct ptlrpc_reply_state *rs =
 824                         list_entry(exp->exp_outstanding_replies.next,
 825                                        struct ptlrpc_reply_state, rs_exp_list);
 826                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 827
 828                 spin_lock(&svcpt->scp_rep_lock);
 829
 830                 list_del_init(&rs->rs_exp_list);
 831
 832                 spin_lock(&rs->rs_lock);
 833                 /* clear rs_convert_lock to make sure rs is handled and put */
 834                 rs->rs_convert_lock = 0;
 835                 ptlrpc_schedule_difficult_reply(rs);
 836                 spin_unlock(&rs->rs_lock);
 837
 838                 spin_unlock(&svcpt->scp_rep_lock);
 839         }
 840         spin_unlock(&exp->exp_lock);
 841
 842         RETURN(rc);
 843 }
 844 EXPORT_SYMBOL(server_disconnect_export);
 845
 846 static inline int target_check_recovery_timer(struct obd_device *target)
 847 {
 848         ktime_t remaining;
 849         s64 timeout;
 850
 851         if (!target->obd_recovering || target->obd_recovery_start == 0)
 852                 return 0;
 853
 854         remaining = hrtimer_get_remaining(&target->obd_recovery_timer);
 855         timeout = ktime_divns(remaining, NSEC_PER_SEC);
 856         if (timeout > -30)
 857                 return 0;
 858
 859         /* the recovery timer should expire, but it isn't triggered,
 860          * it's better to abort the recovery of this target to speed up
 861          * the recovery of the whole cluster. */
 862         spin_lock(&target->obd_dev_lock);
 863         if (target->obd_recovering) {
 864                 CERROR("%s: Aborting recovery\n", target->obd_name);
 865                 target->obd_abort_recovery = 1;
 866                 wake_up(&target->obd_next_transno_waitq);
 867         }
 868         spin_unlock(&target->obd_dev_lock);
 869         return 0;
 870 }
 871
 872 /*
 873  * --------------------------------------------------------------------------
 874  * from old lib/target.c
 875  * --------------------------------------------------------------------------
 876  */
 877 static int target_handle_reconnect(struct lustre_handle *conn,
 878                                    struct obd_export *exp,
 879                                    struct obd_uuid *cluuid)
 880 {
 881         struct obd_device *target;
 882         struct lustre_handle *hdl;
 883         ktime_t remaining;
 884         s64 timeout;
 885         int rc = 0;
 886
 887         ENTRY;
 888         hdl = &exp->exp_imp_reverse->imp_remote_handle;
 889         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
 890                 conn->cookie = exp->exp_handle.h_cookie;
 891                 CDEBUG(D_HA,
 892                        "connect export for UUID '%s' at %p, cookie %#llx\n",
 893                        cluuid->uuid, exp, conn->cookie);
 894                 RETURN(0);
 895         }
 896
 897         target = exp->exp_obd;
 898
 899         /* Might be a re-connect after a partition. */
 900         if (memcmp(&conn->cookie, &hdl->cookie, sizeof(conn->cookie))) {
 901                 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",
 902                               target->obd_name,
 903                               obd_uuid2str(&exp->exp_client_uuid),
 904                               obd_export_nid2str(exp),
 905                               hdl->cookie, conn->cookie);
 906                 memset(conn, 0, sizeof(*conn));
 907                 /*
 908                  * target_handle_connect() treats EALREADY and
 909                  * -EALREADY differently.  -EALREADY is an error
 910                  * (same UUID, different handle).
 911                  */
 912                 RETURN(-EALREADY);
 913         }
 914
 915         if (!target->obd_recovering) {
 916                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
 917                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
 918                         obd_export_nid2str(exp));
 919                 GOTO(out_already, rc);
 920         }
 921
 922         remaining = hrtimer_get_remaining(&target->obd_recovery_timer);
 923         timeout = ktime_divns(remaining, NSEC_PER_SEC);
 924         if (timeout > 0) {
 925                 LCONSOLE_WARN("%s: Client %s (at %s) reconnected, waiting for %d clients in recovery for %lld:%.02lld\n",
 926                               target->obd_name,
 927                               obd_uuid2str(&exp->exp_client_uuid),
 928                               obd_export_nid2str(exp),
 929                               atomic_read(&target->obd_max_recoverable_clients),
 930                               timeout / 60, timeout % 60);
 931         } else {
 932                 struct target_distribute_txn_data *tdtd;
 933                 int size = 0;
 934                 int count = 0;
 935                 char *buf = NULL;
 936
 937                 target_check_recovery_timer(target);
 938
 939                 tdtd = class_exp2tgt(exp)->lut_tdtd;
 940                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
 941                         buf = tdtd->tdtd_show_update_logs_retrievers(
 942                                 tdtd->tdtd_show_retrievers_cbdata,
 943                                 &size, &count);
 944
 945                 if (count > 0)
 946                         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",
 947                                       target->obd_name,
 948                                       obd_uuid2str(&exp->exp_client_uuid),
 949                                       obd_export_nid2str(exp), count,
 950                                       buf ? buf : "unknown (not enough RAM)",
 951                                       (abs(timeout) + target->obd_recovery_timeout) / 60,
 952                                       (abs(timeout) + target->obd_recovery_timeout) % 60,
 953                                       target->obd_name);
 954                 else
 955                         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",
 956                                       target->obd_name, abs(timeout) / 60,
 957                                       abs(timeout) % 60, target->obd_name);
 958
 959                 if (buf != NULL)
 960                         OBD_FREE(buf, size);
 961         }
 962
 963 out_already:
 964         conn->cookie = exp->exp_handle.h_cookie;
 965         /*
 966          * target_handle_connect() treats EALREADY and
 967          * -EALREADY differently.  EALREADY means we are
 968          * doing a valid reconnect from the same client.
 969          */
 970         RETURN(EALREADY);
 971 }
 972
 973 static void
 974 check_and_start_recovery_timer(struct obd_device *obd,
 975                                struct ptlrpc_request *req, int new_client);
 976
 977 /**
 978  * update flags for import during reconnect process
 979  */
 980 static int rev_import_flags_update(struct obd_import *revimp,
 981                                    struct ptlrpc_request *req)
 982 {
 983         int rc;
 984         struct obd_connect_data *data;
 985
 986         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 987
 988         if (data->ocd_connect_flags & OBD_CONNECT_AT)
 989                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 990         else
 991                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 992
 993         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
 994
 995         revimp->imp_connect_data = *data;
 996         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
 997         if (rc) {
 998                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
 999                         revimp->imp_client->cli_name,
1000                         libcfs_idstr(&req->rq_peer), rc);
1001                 return rc;
1002         }
1003
1004         return 0;
1005 }
1006
1007 /**
1008  * Allocate a new reverse import for an export.
1009  *
1010  * \retval -errno in case error hit
1011  * \retval 0 if reverse import correctly init
1012  **/
1013 int rev_import_init(struct obd_export *export)
1014 {
1015         struct obd_device *obd = export->exp_obd;
1016         struct obd_import *revimp;
1017
1018         LASSERT(export->exp_imp_reverse == NULL);
1019
1020         revimp = class_new_import(obd);
1021         if (revimp == NULL)
1022                 return -ENOMEM;
1023
1024         revimp->imp_remote_handle.cookie = 0ULL;
1025         revimp->imp_client = &obd->obd_ldlm_client;
1026         revimp->imp_dlm_fake = 1;
1027
1028         /* it is safe to connect import in new state as no sends possible */
1029         spin_lock(&export->exp_lock);
1030         export->exp_imp_reverse = revimp;
1031         spin_unlock(&export->exp_lock);
1032         class_import_put(revimp);
1033
1034         return 0;
1035 }
1036 EXPORT_SYMBOL(rev_import_init);
1037
1038 /**
1039  * Handle reconnect for an export.
1040  *
1041  * \param exp export to handle reconnect process
1042  * \param req client reconnect request
1043  *
1044  * \retval -rc in case securitfy flavor can't be changed
1045  * \retval 0 in case none problems
1046  */
1047 static int rev_import_reconnect(struct obd_export *exp,
1048                                 struct ptlrpc_request *req)
1049 {
1050         struct obd_import *revimp = exp->exp_imp_reverse;
1051         struct lustre_handle *lh;
1052         int rc;
1053
1054         /* avoid sending a request until import flags are changed */
1055         ptlrpc_import_enter_resend(revimp);
1056
1057         ptlrpc_connection_put(revimp->imp_connection);
1058
1059         /*
1060          * client from recovery don't have a handle so we need to take from
1061          * request. it may produce situation when wrong client connected
1062          * to recovery as we trust a client uuid
1063          */
1064         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1065         revimp->imp_remote_handle = *lh;
1066
1067         /*
1068          * unknown versions will be caught in
1069          * ptlrpc_handle_server_req_in->lustre_unpack_msg()
1070          */
1071         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1072
1073         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
1074
1075         rc = rev_import_flags_update(revimp, req);
1076         if (rc != 0) {
1077                 /*
1078                  * it is safe to still be in RECOVERY phase as we are not able
1079                  * to setup correct security flavor so requests are not able to
1080                  * be delivered correctly
1081                  */
1082                 return rc;
1083         }
1084
1085         /* resend all rpc's via new connection */
1086         return ptlrpc_import_recovery_state_machine(revimp);
1087 }
1088
1089 int target_handle_connect(struct ptlrpc_request *req)
1090 {
1091         struct obd_device *target = NULL;
1092         struct obd_export *export = NULL;
1093         /*
1094          * connect handle - filled from target_handle_reconnect in
1095          * reconnect case
1096          */
1097         struct lustre_handle conn;
1098         struct lustre_handle *tmp;
1099         struct obd_uuid cluuid;
1100         char *str;
1101         int rc = 0;
1102         char *target_start;
1103         int target_len;
1104         bool mds_conn = false, lw_client = false, initial_conn = false;
1105         bool mds_mds_conn = false;
1106         bool new_mds_mds_conn = false;
1107         struct obd_connect_data *data, *tmpdata;
1108         int size, tmpsize;
1109         lnet_nid_t client_nid;
1110 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1111         int tmp_exp_old_falloc;
1112 #endif
1113         struct ptlrpc_connection *pcon = NULL;
1114
1115         ENTRY;
1116
1117         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
1118
1119         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
1120         if (str == NULL) {
1121                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
1122                 GOTO(out, rc = -EINVAL);
1123         }
1124
1125         target = class_dev_by_str(str);
1126         if (!target) {
1127                 deuuidify(str, NULL, &target_start, &target_len);
1128                 LCONSOLE_ERROR_MSG(0x137,
1129                                    "%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",
1130                                    str, libcfs_nidstr(&req->rq_peer.nid));
1131                 GOTO(out, rc = -ENODEV);
1132         }
1133
1134         spin_lock(&target->obd_dev_lock);
1135
1136         target->obd_conn_inprogress++;
1137
1138         if (target->obd_stopping || !target->obd_set_up) {
1139                 spin_unlock(&target->obd_dev_lock);
1140
1141                 deuuidify(str, NULL, &target_start, &target_len);
1142                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
1143                               target_len, target_start,
1144                               libcfs_nidstr(&req->rq_peer.nid),
1145                               (target->obd_stopping ?
1146                                "stopping" : "not set up"));
1147                 GOTO(out, rc = -ENODEV);
1148         }
1149
1150         if (target->obd_no_conn) {
1151                 spin_unlock(&target->obd_dev_lock);
1152
1153                 CDEBUG(D_INFO,
1154                        "%s: Temporarily refusing client connection from %s\n",
1155                        target->obd_name, libcfs_nidstr(&req->rq_peer.nid));
1156                 GOTO(out, rc = -EAGAIN);
1157         }
1158
1159         spin_unlock(&target->obd_dev_lock);
1160
1161         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1162         if (str == NULL) {
1163                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1164                 GOTO(out, rc = -EINVAL);
1165         }
1166
1167         obd_str2uuid(&cluuid, str);
1168
1169         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1170         if (tmp == NULL)
1171                 GOTO(out, rc = -EPROTO);
1172
1173         conn = *tmp;
1174
1175         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1176                                     RCL_CLIENT);
1177         if (size < 0 || size > 8 * sizeof(struct obd_connect_data))
1178                 GOTO(out, rc = -EPROTO);
1179         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1180         if (!data)
1181                 GOTO(out, rc = -EPROTO);
1182
1183         rc = req_capsule_server_pack(&req->rq_pill);
1184         if (rc)
1185                 GOTO(out, rc);
1186
1187 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1188         /*
1189          * Don't allow clients to connect that are using old 1.8 format
1190          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1191          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1192          * FULL20 flag should be set on all connections since 2.0, but no
1193          * longer affects behaviour.
1194          *
1195          * Later this check will be disabled and the flag can be retired
1196          * completely once interop with 3.0 is no longer needed.
1197          */
1198         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1199                 GOTO(out, rc = -EPROTO);
1200
1201         /* Old clients will have 'tmp_exp_old_falloc' as 1.
1202          * Newer clients (2.15) and beyond will have it set as 0
1203          */
1204         tmp_exp_old_falloc =
1205                 !!(data->ocd_connect_flags & OBD_CONNECT_OLD_FALLOC);
1206
1207         CDEBUG(D_INFO, "%s: ocd_connect_flags: %#llx tmp_exp_old_falloc: %d\n",
1208                target->obd_name, data->ocd_connect_flags, tmp_exp_old_falloc);
1209
1210         /*
1211          * Don't allow liblustre clients to connect.
1212          * - testing was disabled in v2_2_50_0-61-g6a75d65
1213          * - building was disabled in v2_5_58_0-28-g7277179
1214          * - client code was deleted in v2_6_50_0-101-gcdfbc72,
1215          * - clients were refused connect for version difference > 0.0.1.32
1216          */
1217         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1218                 DEBUG_REQ(D_WARNING, req, "Refusing libclient connection");
1219                 GOTO(out, rc = -EPROTO);
1220         }
1221 #endif
1222
1223         /*
1224          * Note: lw_client is needed in MDS-MDS failover during update log
1225          * processing, so we needs to allow lw_client to be connected at
1226          * anytime, instead of only the initial connection
1227          */
1228         lw_client = OCD_HAS_FLAG(data, LIGHTWEIGHT);
1229
1230         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1231                 initial_conn = true;
1232                 mds_conn = OCD_HAS_FLAG(data, MDS);
1233                 mds_mds_conn = OCD_HAS_FLAG(data, MDS_MDS);
1234
1235                 /*
1236                  * OBD_CONNECT_MNE_SWAB is removed at 2.14
1237                  * Checking OBD_CONNECT_FID can be removed in the future.
1238                  *
1239                  * Via check OBD_CONNECT_FID, we can distinguish whether
1240                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1241                  * MGC or MDT, since MGC does not use OBD_CONNECT_FID.
1242                  */
1243                 if (!lw_client &&
1244                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1245                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1246                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1247                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1248                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1249                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1250
1251                         /*
1252                          * We do not support the MDT-MDT interoperations with
1253                          * different version MDT because of protocol changes.
1254                          */
1255                         if (unlikely(major != LUSTRE_MAJOR ||
1256                                      minor != LUSTRE_MINOR ||
1257                                      abs(patch - LUSTRE_PATCH) > 3)) {
1258                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the connection from different version MDT (%d.%d.%d.%d) %s %s\n",
1259                                               target->obd_name, LUSTRE_MAJOR,
1260                                               LUSTRE_MINOR, LUSTRE_PATCH,
1261                                               LUSTRE_FIX, major, minor, patch,
1262                                               OBD_OCD_VERSION_FIX(data->ocd_version),
1263                                               libcfs_nidstr(&req->rq_peer.nid),
1264                                               str);
1265                                 GOTO(out, rc = -EPROTO);
1266                         }
1267                 }
1268         }
1269
1270         /* lctl gets a backstage, all-access pass. */
1271         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1272                 goto dont_check_exports;
1273
1274         export = obd_uuid_lookup(target, &cluuid);
1275         if (!export)
1276                 goto no_export;
1277
1278         /* We've found an export in the hash. */
1279
1280         spin_lock(&export->exp_lock);
1281
1282         if (export->exp_connecting) { /* b=9635, et. al. */
1283                 spin_unlock(&export->exp_lock);
1284                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1285                               export->exp_obd->obd_name, export,
1286                               libcfs_nidstr(&req->rq_peer.nid));
1287                 class_export_put(export);
1288                 export = NULL;
1289                 rc = -EALREADY;
1290         } else if ((mds_conn || (lw_client && initial_conn) ||
1291                    OCD_HAS_FLAG(data, MDS_MDS)) && export->exp_connection) {
1292                 spin_unlock(&export->exp_lock);
1293                 if (!nid_same(&req->rq_peer.nid,
1294                               &export->exp_connection->c_peer.nid)) {
1295                         /* MDS or LWP reconnected after failover. */
1296                         LCONSOLE_WARN("%s: Received %s connection from %s, removing former export from %s\n",
1297                                       target->obd_name,
1298                                       lw_client ? "LWP" : "MDS",
1299                                       libcfs_nidstr(&req->rq_peer.nid),
1300                                       libcfs_nidstr(&export->exp_connection->c_peer.nid));
1301                 } else {
1302                         /* New connection from the same NID. */
1303                         LCONSOLE_WARN("%s: Received new %s connection from %s, %s former export from same NID\n",
1304                                       target->obd_name,
1305                                       lw_client ? "LWP" : "MDS",
1306                                       libcfs_nidstr(&req->rq_peer.nid),
1307                                       OCD_HAS_FLAG(data, MDS_MDS) ?
1308                                       "keep" : "remove");
1309                 }
1310
1311                 if (nid_same(&req->rq_peer.nid,
1312                              &export->exp_connection->c_peer.nid) &&
1313                     OCD_HAS_FLAG(data, MDS_MDS)) {
1314                         /*
1315                          * Because exports between MDTs will always be
1316                          * kept, let's do not fail such export if they
1317                          * come from the same NID, otherwise it might
1318                          * cause eviction between MDTs, which might
1319                          * cause namespace inconsistency
1320                          */
1321                         spin_lock(&export->exp_lock);
1322                         export->exp_connecting = 1;
1323                         export->exp_conn_cnt = 0;
1324                         spin_unlock(&export->exp_lock);
1325                         conn.cookie = export->exp_handle.h_cookie;
1326                         rc = EALREADY;
1327                 } else {
1328                         class_fail_export(export);
1329                         class_export_put(export);
1330                         export = NULL;
1331                         rc = 0;
1332                 }
1333         } else if (export->exp_connection != NULL && initial_conn &&
1334                    !nid_same(&req->rq_peer.nid,
1335                              &export->exp_connection->c_peer.nid)) {
1336                 spin_unlock(&export->exp_lock);
1337                 /* In MDS failover we have static UUID but NID can change. */
1338                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when existing nid %s is already connected\n",
1339                               target->obd_name, cluuid.uuid,
1340                               libcfs_nidstr(&req->rq_peer.nid),
1341                               libcfs_nidstr(
1342                                       &export->exp_connection->c_peer.nid));
1343                 rc = -EALREADY;
1344                 class_export_put(export);
1345                 export = NULL;
1346         } else if (OBD_FAIL_PRECHECK(OBD_FAIL_TGT_RECOVERY_CONNECT) &&
1347                    !lw_client) {
1348                 spin_unlock(&export->exp_lock);
1349                 rc = -EAGAIN;
1350         } else {
1351                 export->exp_connecting = 1;
1352                 spin_unlock(&export->exp_lock);
1353                 LASSERT(export->exp_obd == target);
1354
1355                 rc = target_handle_reconnect(&conn, export, &cluuid);
1356         }
1357
1358         /* If we found an export, we already unlocked. */
1359         if (!export) {
1360 no_export:
1361                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1362         } else if (req->rq_export == NULL &&
1363                    atomic_read(&export->exp_rpc_count) > 0) {
1364                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, still busy with %d references\n",
1365                               target->obd_name, cluuid.uuid,
1366                               libcfs_nidstr(&req->rq_peer.nid),
1367                               refcount_read(&export->exp_handle.h_ref));
1368                         GOTO(out, rc = -EBUSY);
1369         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
1370                    rc != EALREADY) {
1371                 if (!strstr(cluuid.uuid, "mdt"))
1372                         LCONSOLE_WARN("%s: Rejecting reconnect from the known client %s (at %s) because it is indicating it is a new client\n",
1373                                       target->obd_name, cluuid.uuid,
1374                                       libcfs_nidstr(&req->rq_peer.nid));
1375                 GOTO(out, rc = -EALREADY);
1376         } else {
1377                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1378         }
1379
1380         if (rc < 0)
1381                 GOTO(out, rc);
1382
1383         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %lld last %lld\n",
1384                target->obd_name, cluuid.uuid, libcfs_nidstr(&req->rq_peer.nid),
1385                target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1386                export, ktime_get_seconds(),
1387                export ? export->exp_last_request_time : 0);
1388
1389         /*
1390          * If this is the first time a client connects, reset the recovery
1391          * timer. Discard lightweight connections which might be local.
1392          */
1393         if (!lw_client && rc == 0 && target->obd_recovering)
1394                 check_and_start_recovery_timer(target, req, export == NULL);
1395
1396         /*
1397          * We want to handle EALREADY but *not* -EALREADY from
1398          * target_handle_reconnect(), return reconnection state in a flag.
1399          */
1400         if (rc == EALREADY) {
1401                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1402                 rc = 0;
1403         } else {
1404                 LASSERT(rc == 0);
1405         }
1406
1407         /* Tell the client if we support replayable requests. */
1408         if (target->obd_replayable)
1409                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1410         client_nid = lnet_nid_to_nid4(&req->rq_peer.nid);
1411
1412         if (export == NULL) {
1413                 /* allow lightweight connections during recovery */
1414                 /*
1415                  * allow "new" MDT to be connected during recovery, since we
1416                  * need retrieve recovery update records from it
1417                  */
1418                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1419                         struct hrtimer *timer = &target->obd_recovery_timer;
1420                         ktime_t remaining;
1421                         s64 timeout, left;
1422                         int in_progress;
1423                         int connected;
1424                         int known;
1425                         int stale;
1426                         char *msg;
1427
1428                         connected = atomic_read(&target->obd_connected_clients);
1429                         in_progress = atomic_read(&target->obd_lock_replay_clients);
1430                         known =
1431                            atomic_read(&target->obd_max_recoverable_clients);
1432                         stale = target->obd_stale_clients;
1433                         remaining = hrtimer_get_remaining(timer);
1434                         left = ktime_divns(remaining, NSEC_PER_SEC);
1435
1436                         if (ktime_to_ns(remaining) > 0) {
1437                                 msg = "to recover in";
1438                                 timeout = left;
1439                         } else {
1440                                 msg = "already passed deadline";
1441                                 timeout = -left;
1442
1443                                 target_check_recovery_timer(target);
1444                         }
1445
1446                         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",
1447                                       target->obd_name, cluuid.uuid,
1448                                       libcfs_nidstr(&req->rq_peer.nid), known,
1449                                       connected - in_progress, in_progress,
1450                                       stale, msg, timeout / 60, timeout % 60);
1451                         rc = -EBUSY;
1452                 } else {
1453 dont_check_exports:
1454                         rc = obd_connect(req->rq_svc_thread->t_env,
1455                                          &export, target, &cluuid, data,
1456                                          &client_nid);
1457                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1458                                 lustre_msg_add_op_flags(req->rq_repmsg,
1459                                                         MSG_CONNECT_RECOVERING);
1460                         if (rc == 0) {
1461                                 conn.cookie = export->exp_handle.h_cookie;
1462                                 rc = rev_import_init(export);
1463                         }
1464
1465                         if (mds_mds_conn)
1466                                 new_mds_mds_conn = true;
1467                 }
1468         } else {
1469                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1470                                    export, target, &cluuid, data, &client_nid);
1471         }
1472         if (rc)
1473                 GOTO(out, rc);
1474
1475         data->ocd_instance = obd2obt(target)->obt_instance;
1476
1477         /*
1478          * Return only the parts of obd_connect_data that we understand, so the
1479          * client knows that we don't understand the rest.
1480          */
1481         if (data) {
1482                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1483                                                RCL_SERVER);
1484                 tmpdata = req_capsule_server_get(&req->rq_pill,
1485                                                  &RMF_CONNECT_DATA);
1486                 /*
1487                  * Don't use struct assignment here, because the client reply
1488                  * buffer may be smaller/larger than the local struct
1489                  * obd_connect_data.
1490                  */
1491                 memcpy(tmpdata, data, min(tmpsize, size));
1492         }
1493
1494         /*
1495          * If the client and the server are the same node, we will already
1496          * have an export that really points to the client's DLM export,
1497          * because we have a shared handles table.
1498          *
1499          * XXX this will go away when shaver stops sending the "connect" handle
1500          * in the real "remote handle" field of the request --phik 24 Apr 2003
1501          */
1502         ptlrpc_request_change_export(req, export);
1503
1504         pcon = ptlrpc_connection_get(&req->rq_peer,
1505                                      &req->rq_self, &cluuid);
1506         if (pcon == NULL)
1507                 GOTO(out, rc = -ENOTCONN);
1508
1509         spin_lock(&export->exp_lock);
1510
1511         if (export->exp_disconnected) {
1512                 spin_unlock(&export->exp_lock);
1513                 GOTO(out, rc = -ENODEV);
1514         }
1515         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1516                 spin_unlock(&export->exp_lock);
1517                 CDEBUG(D_RPCTRACE,
1518                        "%s: %s already connected at greater or equal conn_cnt: %d >= %d\n",
1519                        cluuid.uuid, libcfs_nidstr(&req->rq_peer.nid),
1520                        export->exp_conn_cnt,
1521                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1522
1523                 GOTO(out, rc = -EALREADY);
1524         }
1525         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1526         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1527
1528 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1529         /* make 'tmp_exp_old_falloc' persistent by saving it into
1530          * server side export object(obd_export)
1531          */
1532         export->exp_old_falloc = tmp_exp_old_falloc;
1533 #endif
1534
1535         /* Check to see if connection came from another NID. */
1536         if (export->exp_connection != NULL &&
1537             !nid_same(&export->exp_connection->c_peer.nid,
1538                       &req->rq_peer.nid)) {
1539                 obd_nid_del(export->exp_obd, export);
1540                 ptlrpc_connection_put(export->exp_connection);
1541                 export->exp_connection = NULL;
1542         }
1543
1544         if (export->exp_connection == NULL) {
1545                 export->exp_connection = pcon;
1546                 pcon = NULL;
1547         }
1548         obd_nid_add(export->exp_obd, export);
1549
1550         spin_unlock(&export->exp_lock);
1551
1552         lustre_msg_set_handle(req->rq_repmsg, &conn);
1553
1554         rc = rev_import_reconnect(export, req);
1555         if (rc != 0)
1556                 GOTO(out, rc);
1557
1558         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1559                 int has_transno;
1560                 __u64 transno = data->ocd_transno;
1561
1562                 spin_lock(&export->exp_lock);
1563                 /*
1564                  * possible race with class_disconnect_stale_exports,
1565                  * export may be already in the eviction process
1566                  */
1567                 if (export->exp_failed) {
1568                         spin_unlock(&export->exp_lock);
1569                         GOTO(out, rc = -ENODEV);
1570                 }
1571                 export->exp_in_recovery = 1;
1572                 export->exp_req_replay_needed = 1;
1573                 export->exp_lock_replay_needed = 1;
1574                 spin_unlock(&export->exp_lock);
1575
1576                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1577                                  MSG_CONNECT_TRANSNO);
1578                 if (has_transno && transno == 0)
1579                         CWARN("Connect with zero transno!\n");
1580
1581                 if (has_transno && transno > 0 &&
1582                     transno < target->obd_next_recovery_transno &&
1583                     transno > target->obd_last_committed) {
1584                         /* Another way is to use cmpxchg() to be lock-free. */
1585                         spin_lock(&target->obd_recovery_task_lock);
1586                         if (transno < target->obd_next_recovery_transno)
1587                                 target->obd_next_recovery_transno = transno;
1588                         spin_unlock(&target->obd_recovery_task_lock);
1589                 }
1590
1591                 atomic_inc(&target->obd_req_replay_clients);
1592                 atomic_inc(&target->obd_lock_replay_clients);
1593                 /*
1594                  * Note: MDS-MDS connection is allowed to be connected during
1595                  * recovery, no matter if the exports needs to be recoveried.
1596                  * Because we need retrieve updates logs from all other MDTs.
1597                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1598                  * also needs to be increased to match other recovery checking
1599                  * condition.
1600                  */
1601                 if (new_mds_mds_conn)
1602                         atomic_inc(&target->obd_max_recoverable_clients);
1603
1604                 if (atomic_inc_return(&target->obd_connected_clients) ==
1605                     atomic_read(&target->obd_max_recoverable_clients))
1606                         wake_up(&target->obd_next_transno_waitq);
1607         }
1608
1609         /* Tell the client we're in recovery, when client is involved in it. */
1610         if (target->obd_recovering && !lw_client)
1611                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1612
1613 out:
1614         if (export) {
1615                 spin_lock(&export->exp_lock);
1616                 export->exp_connecting = 0;
1617                 spin_unlock(&export->exp_lock);
1618
1619                 class_export_put(export);
1620         }
1621         if (target != NULL) {
1622                 spin_lock(&target->obd_dev_lock);
1623                 target->obd_conn_inprogress--;
1624                 spin_unlock(&target->obd_dev_lock);
1625                 class_decref(target, "find", current);
1626         }
1627         if (pcon)
1628                 ptlrpc_connection_put(pcon);
1629         req->rq_status = rc;
1630         RETURN(rc);
1631 }
1632
1633 int target_handle_disconnect(struct ptlrpc_request *req)
1634 {
1635         int rc;
1636
1637         ENTRY;
1638
1639         rc = req_capsule_server_pack(&req->rq_pill);
1640         if (rc)
1641                 RETURN(rc);
1642
1643         /* In case of target disconnect, updating sec ctx immediately is
1644          * required in order to record latest sequence number used.
1645          * Sequence is normally updated on export destroy, but this event
1646          * can occur too late, ie after a new target connect request has
1647          * been processed.
1648          * Maintaining correct sequence when client connection becomes idle
1649          * ensures that GSS does not erroneously consider requests as replays.
1650          */
1651         rc = sptlrpc_export_update_ctx(req->rq_export);
1652         if (rc)
1653                 RETURN(rc);
1654
1655         /* Keep the rq_export around so we can send the reply. */
1656         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1657
1658         RETURN(0);
1659 }
1660
1661 void target_destroy_export(struct obd_export *exp)
1662 {
1663         struct obd_import *imp = NULL;
1664         /*
1665          * exports created from last_rcvd data, and "fake"
1666          * exports created by lctl don't have an import
1667          */
1668         spin_lock(&exp->exp_lock);
1669         if (exp->exp_imp_reverse != NULL) {
1670                 imp = exp->exp_imp_reverse;
1671                 exp->exp_imp_reverse = NULL;
1672         }
1673         spin_unlock(&exp->exp_lock);
1674         if (imp != NULL)
1675                 client_destroy_import(imp);
1676
1677         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1678         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1679         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1680         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1681 }
1682 EXPORT_SYMBOL(target_destroy_export);
1683
1684 /*
1685  * Recovery functions
1686  */
1687 static void target_request_copy_get(struct ptlrpc_request *req)
1688 {
1689         class_export_rpc_inc(req->rq_export);
1690         LASSERT(list_empty(&req->rq_list));
1691         INIT_LIST_HEAD(&req->rq_replay_list);
1692
1693         /* Increase refcount to keep request in queue. */
1694         atomic_inc(&req->rq_refcount);
1695         /* Let export know it has replays to be handled. */
1696         atomic_inc(&req->rq_export->exp_replay_count);
1697 }
1698
1699 static void target_request_copy_put(struct ptlrpc_request *req)
1700 {
1701         LASSERT(list_empty(&req->rq_replay_list));
1702         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1703
1704         atomic_dec(&req->rq_export->exp_replay_count);
1705         class_export_rpc_dec(req->rq_export);
1706         ptlrpc_server_drop_request(req);
1707 }
1708
1709 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1710 {
1711         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1712         struct obd_export *exp = req->rq_export;
1713         struct ptlrpc_request *reqiter;
1714         struct ptlrpc_request *dup_req = NULL;
1715         int dup = 0;
1716
1717         LASSERT(exp);
1718
1719         spin_lock(&exp->exp_lock);
1720         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1721                             rq_replay_list) {
1722                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1723                         dup_req = reqiter;
1724                         dup = 1;
1725                         break;
1726                 }
1727         }
1728
1729         if (dup) {
1730                 /* We expect it with RESENT and REPLAY flags. */
1731                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1732                     (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1733                         CERROR("invalid flags %x of resent replay\n",
1734                                lustre_msg_get_flags(req->rq_reqmsg));
1735
1736                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1737                         __u32 new_conn;
1738
1739                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1740                         if (new_conn >
1741                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1742                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1743                                                         new_conn);
1744                 }
1745         } else {
1746                 list_add_tail(&req->rq_replay_list,
1747                               &exp->exp_req_replay_queue);
1748         }
1749
1750         spin_unlock(&exp->exp_lock);
1751         return dup;
1752 }
1753
1754 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1755 {
1756         LASSERT(!list_empty(&req->rq_replay_list));
1757         LASSERT(req->rq_export);
1758
1759         spin_lock(&req->rq_export->exp_lock);
1760         list_del_init(&req->rq_replay_list);
1761         spin_unlock(&req->rq_export->exp_lock);
1762 }
1763
1764 static void target_finish_recovery(struct lu_target *lut)
1765 {
1766         struct obd_device *obd = lut->lut_obd;
1767
1768         ENTRY;
1769
1770         /* Only log a recovery message when recovery has occurred. */
1771         if (obd->obd_recovery_start) {
1772                 time64_t now = ktime_get_seconds();
1773                 time64_t elapsed_time;
1774
1775                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start,
1776                                      1);
1777                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients %d recovered and %d %s evicted.\n",
1778                               obd->obd_name, elapsed_time / 60,
1779                               elapsed_time % 60,
1780                               atomic_read(&obd->obd_max_recoverable_clients),
1781                               atomic_read(&obd->obd_connected_clients),
1782                               obd->obd_stale_clients,
1783                               obd->obd_stale_clients == 1 ? "was" : "were");
1784                 if (obd->obd_stale_clients && do_dump_on_eviction(obd))
1785                         libcfs_debug_dumplog();
1786         }
1787
1788         ldlm_reprocess_recovery_done(obd->obd_namespace);
1789         spin_lock(&obd->obd_recovery_task_lock);
1790         if (!list_empty(&obd->obd_req_replay_queue) ||
1791             !list_empty(&obd->obd_lock_replay_queue) ||
1792             !list_empty(&obd->obd_final_req_queue)) {
1793                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1794                        obd->obd_name,
1795                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1796                        list_empty(&obd->obd_lock_replay_queue) ? \
1797                                   "" : "lock ",
1798                        list_empty(&obd->obd_final_req_queue) ? \
1799                                   "" : "final ");
1800                 spin_unlock(&obd->obd_recovery_task_lock);
1801                 LBUG();
1802         }
1803         spin_unlock(&obd->obd_recovery_task_lock);
1804
1805         obd->obd_recovery_end = ktime_get_seconds();
1806
1807         /* When recovery finished, cleanup orphans on MDS and OST. */
1808         if (obd->obd_type && OBP(obd, postrecov)) {
1809                 int rc = OBP(obd, postrecov)(obd);
1810
1811                 if (rc < 0)
1812                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1813                                       obd->obd_name, rc);
1814         }
1815         EXIT;
1816 }
1817
1818 static void abort_req_replay_queue(struct obd_device *obd)
1819 {
1820         struct ptlrpc_request *req, *n;
1821         LIST_HEAD(abort_list);
1822
1823         spin_lock(&obd->obd_recovery_task_lock);
1824         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1825         spin_unlock(&obd->obd_recovery_task_lock);
1826         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1827                 DEBUG_REQ(D_WARNING, req, "aborted:");
1828                 req->rq_status = -ENOTCONN;
1829                 if (ptlrpc_error(req)) {
1830                         DEBUG_REQ(D_ERROR, req,
1831                                   "failed abort_req_reply; skipping");
1832                 }
1833                 target_exp_dequeue_req_replay(req);
1834                 target_request_copy_put(req);
1835         }
1836 }
1837
1838 static void abort_lock_replay_queue(struct obd_device *obd)
1839 {
1840         struct ptlrpc_request *req, *n;
1841         LIST_HEAD(abort_list);
1842
1843         spin_lock(&obd->obd_recovery_task_lock);
1844         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1845         spin_unlock(&obd->obd_recovery_task_lock);
1846         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1847                 DEBUG_REQ(D_ERROR, req, "aborted:");
1848                 req->rq_status = -ENOTCONN;
1849                 if (ptlrpc_error(req)) {
1850                         DEBUG_REQ(D_ERROR, req,
1851                                   "failed abort_lock_reply; skipping");
1852                 }
1853                 target_request_copy_put(req);
1854         }
1855 }
1856
1857 /*
1858  * Called from a cleanup function if the device is being cleaned up
1859  * forcefully.  The exports should all have been disconnected already,
1860  * the only thing left to do is
1861  * - clear the recovery flags
1862  * - cancel the timer
1863  * - free queued requests and replies, but don't send replies
1864  * Because the obd_stopping flag is set, no new requests should be received.
1865  */
1866 void target_cleanup_recovery(struct obd_device *obd)
1867 {
1868         struct ptlrpc_request *req, *n;
1869         LIST_HEAD(clean_list);
1870
1871         spin_lock(&obd->obd_dev_lock);
1872         if (!obd->obd_recovering) {
1873                 spin_unlock(&obd->obd_dev_lock);
1874                 EXIT;
1875                 return;
1876         }
1877         obd->obd_recovering = obd->obd_abort_recovery = 0;
1878         obd->obd_abort_recov_mdt = 0;
1879         spin_unlock(&obd->obd_dev_lock);
1880
1881         spin_lock(&obd->obd_recovery_task_lock);
1882         target_cancel_recovery_timer(obd);
1883         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1884         spin_unlock(&obd->obd_recovery_task_lock);
1885
1886         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1887                 LASSERT(req->rq_reply_state == NULL);
1888                 target_exp_dequeue_req_replay(req);
1889                 target_request_copy_put(req);
1890         }
1891
1892         spin_lock(&obd->obd_recovery_task_lock);
1893         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1894         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1895         spin_unlock(&obd->obd_recovery_task_lock);
1896
1897         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1898                 LASSERT(req->rq_reply_state == NULL);
1899                 target_request_copy_put(req);
1900         }
1901
1902         EXIT;
1903 }
1904 EXPORT_SYMBOL(target_cleanup_recovery);
1905
1906 /* obd_recovery_task_lock should be held */
1907 void target_cancel_recovery_timer(struct obd_device *obd)
1908 {
1909         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1910         hrtimer_cancel(&obd->obd_recovery_timer);
1911 }
1912
1913 static void target_start_recovery_timer(struct obd_device *obd)
1914 {
1915         ktime_t delay;
1916
1917         if (obd->obd_recovery_start != 0)
1918                 return;
1919
1920         spin_lock(&obd->obd_dev_lock);
1921         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1922                 spin_unlock(&obd->obd_dev_lock);
1923                 return;
1924         }
1925
1926         LASSERT(obd->obd_recovery_timeout != 0);
1927
1928         if (obd->obd_recovery_start != 0) {
1929                 spin_unlock(&obd->obd_dev_lock);
1930                 return;
1931         }
1932
1933         obd->obd_recovery_start = ktime_get_seconds();
1934         delay = ktime_set(obd->obd_recovery_start +
1935                           obd->obd_recovery_timeout, 0);
1936         hrtimer_start(&obd->obd_recovery_timer, delay, HRTIMER_MODE_ABS);
1937         spin_unlock(&obd->obd_dev_lock);
1938
1939         LCONSOLE_WARN("%s: Will be in recovery for at least %u:%02u, or until %d client%s reconnect%s\n",
1940                       obd->obd_name,
1941                       obd->obd_recovery_timeout / 60,
1942                       obd->obd_recovery_timeout % 60,
1943                       atomic_read(&obd->obd_max_recoverable_clients),
1944                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1945                       "" : "s",
1946                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1947                       "s" : "");
1948 }
1949
1950 /**
1951  * extend recovery window.
1952  *
1953  * if @extend is true, extend recovery window to have @dr_timeout remaining
1954  * at least; otherwise, make sure the recovery timeout value is not less
1955  * than @dr_timeout.
1956  */
1957 static void extend_recovery_timer(struct obd_device *obd, timeout_t dr_timeout,
1958                                   bool extend)
1959 {
1960         ktime_t left_ns;
1961         timeout_t timeout;
1962         timeout_t left;
1963
1964         spin_lock(&obd->obd_dev_lock);
1965         if (!obd->obd_recovering || obd->obd_abort_recovery ||
1966             obd->obd_stopping) {
1967                 spin_unlock(&obd->obd_dev_lock);
1968                 return;
1969         }
1970         LASSERT(obd->obd_recovery_start != 0);
1971
1972         left_ns = hrtimer_get_remaining(&obd->obd_recovery_timer);
1973         left = ktime_divns(left_ns, NSEC_PER_SEC);
1974
1975         if (extend) {
1976                 timeout = obd->obd_recovery_timeout;
1977                 /* dr_timeout will happen after the hrtimer has expired.
1978                  * Add the excess time to the soft recovery timeout without
1979                  * exceeding the hard recovery timeout.
1980                  */
1981                 if (dr_timeout > left) {
1982                         timeout += dr_timeout - left;
1983                         timeout = min_t(timeout_t, obd->obd_recovery_time_hard,
1984                                         timeout);
1985                 }
1986         } else {
1987                 timeout = clamp_t(timeout_t, dr_timeout,
1988                                   obd->obd_recovery_timeout,
1989                                   obd->obd_recovery_time_hard);
1990         }
1991
1992         if (timeout == obd->obd_recovery_time_hard)
1993                 CWARN("%s: extended recovery timer reached hard limit: %d, extend: %d\n",
1994                       obd->obd_name, timeout, extend);
1995
1996         if (obd->obd_recovery_timeout < timeout) {
1997                 ktime_t end, now;
1998
1999                 obd->obd_recovery_timeout = timeout;
2000                 end = ktime_set(obd->obd_recovery_start + timeout, 0);
2001                 now = ktime_set(ktime_get_seconds(), 0);
2002                 left_ns = ktime_sub(end, now);
2003                 hrtimer_start(&obd->obd_recovery_timer, end, HRTIMER_MODE_ABS);
2004                 left = ktime_divns(left_ns, NSEC_PER_SEC);
2005         }
2006         spin_unlock(&obd->obd_dev_lock);
2007
2008         CDEBUG(D_HA, "%s: recovery timer will expire in %d seconds\n",
2009                 obd->obd_name, left);
2010 }
2011
2012 /* Reset the timer with each new client connection */
2013 /*
2014  * This timer is actually reconnect_timer, which is for making sure
2015  * the total recovery window is at least as big as my reconnect
2016  * attempt timing. So the initial recovery time_out will be set to
2017  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
2018  * from client is bigger than this, then the recovery time_out will
2019  * be extended to make sure the client could be reconnected, in the
2020  * process, the timeout from the new client should be ignored.
2021  */
2022 static void
2023 check_and_start_recovery_timer(struct obd_device *obd,
2024                                struct ptlrpc_request *req,
2025                                int new_client)
2026 {
2027         timeout_t service_timeout = lustre_msg_get_service_timeout(req->rq_reqmsg);
2028         struct obd_device_target *obt = obd2obt(obd);
2029
2030         if (!new_client && service_timeout)
2031                 /*
2032                  * Teach server about old server's estimates, as first guess
2033                  * at how long new requests will take.
2034                  */
2035                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
2036                             service_timeout);
2037
2038         target_start_recovery_timer(obd);
2039
2040         /*
2041          * Convert the service time to RPC timeout,
2042          * and reuse service_timeout to limit stack usage.
2043          */
2044         service_timeout = at_est2timeout(service_timeout);
2045
2046         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
2047             service_timeout < at_extra)
2048                 service_timeout = at_extra;
2049
2050         /*
2051          * We expect other clients to timeout within service_timeout, then try
2052          * to reconnect, then try the failover server.  The max delay between
2053          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL.
2054          */
2055         service_timeout += 2 * INITIAL_CONNECT_TIMEOUT;
2056
2057         LASSERT(obt->obt_magic == OBT_MAGIC);
2058         service_timeout += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
2059         if (service_timeout > obd->obd_recovery_timeout && !new_client)
2060                 extend_recovery_timer(obd, service_timeout, false);
2061 }
2062
2063 /** Health checking routines */
2064 static inline int exp_connect_healthy(struct obd_export *exp)
2065 {
2066         return exp->exp_in_recovery;
2067 }
2068
2069 /** if export done req_replay or has replay in queue */
2070 static inline int exp_req_replay_healthy(struct obd_export *exp)
2071 {
2072         return (!exp->exp_req_replay_needed ||
2073                 atomic_read(&exp->exp_replay_count) > 0);
2074 }
2075
2076
2077 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
2078 {
2079         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
2080                exp_req_replay_healthy(exp);
2081 }
2082
2083 /** if export done lock_replay or has replay in queue */
2084 static inline int exp_lock_replay_healthy(struct obd_export *exp)
2085 {
2086         return (!exp->exp_lock_replay_needed ||
2087                 atomic_read(&exp->exp_replay_count) > 0);
2088 }
2089
2090 static inline int exp_vbr_healthy(struct obd_export *exp)
2091 {
2092         return !exp->exp_vbr_failed;
2093 }
2094
2095 static inline int exp_finished(struct obd_export *exp)
2096 {
2097         return exp->exp_in_recovery && !exp->exp_lock_replay_needed;
2098 }
2099
2100 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
2101 {
2102         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
2103                 exp_finished(exp);
2104 }
2105
2106 static int check_for_next_transno(struct lu_target *lut)
2107 {
2108         struct ptlrpc_request *req = NULL;
2109         struct obd_device *obd = lut->lut_obd;
2110         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2111         int wake_up = 0, connected, completed, queue_len;
2112         __u64 req_transno = 0;
2113         __u64 update_transno = 0;
2114         __u64 next_transno = 0;
2115
2116         ENTRY;
2117
2118         spin_lock(&obd->obd_recovery_task_lock);
2119         if (!list_empty(&obd->obd_req_replay_queue)) {
2120                 req = list_entry(obd->obd_req_replay_queue.next,
2121                                      struct ptlrpc_request, rq_list);
2122                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
2123         }
2124
2125         if (!obd->obd_abort_recov_mdt && tdtd)
2126                 update_transno = distribute_txn_get_next_transno(tdtd);
2127
2128         connected = atomic_read(&obd->obd_connected_clients);
2129         completed = connected - atomic_read(&obd->obd_req_replay_clients);
2130         queue_len = obd->obd_requests_queued_for_recovery;
2131         next_transno = obd->obd_next_recovery_transno;
2132
2133         CDEBUG(D_HA,
2134                "max: %d, connected: %d, completed: %d, queue_len: %d, req_transno: %llu, next_transno: %llu\n",
2135                atomic_read(&obd->obd_max_recoverable_clients),
2136                connected, completed,
2137                queue_len, req_transno, next_transno);
2138
2139         if (obd->obd_abort_recovery) {
2140                 CDEBUG(D_HA, "waking for aborted recovery\n");
2141                 wake_up = 1;
2142         } else if (obd->obd_recovery_expired) {
2143                 CDEBUG(D_HA, "waking for expired recovery\n");
2144                 wake_up = 1;
2145         } else if (!obd->obd_abort_recov_mdt && tdtd && req &&
2146                    is_req_replayed_by_update(req)) {
2147                 LASSERTF(req_transno < next_transno,
2148                          "req_transno %llu next_transno%llu\n", req_transno,
2149                          next_transno);
2150                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
2151                        req_transno);
2152                 wake_up = 1;
2153         } else if (req_transno == next_transno ||
2154                    (update_transno != 0 && update_transno <= next_transno)) {
2155                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
2156                 wake_up = 1;
2157         } else if (queue_len > 0 &&
2158                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
2159                 /** handle gaps occured due to lost reply or VBR */
2160                 LASSERTF(req_transno >= next_transno,
2161                          "req_transno: %llu, next_transno: %llu\n",
2162                          req_transno, next_transno);
2163                 CDEBUG(D_HA,
2164                        "%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",
2165                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
2166                        next_transno, queue_len, completed, connected,
2167                        req_transno, update_transno, obd->obd_last_committed);
2168                 obd->obd_next_recovery_transno = req_transno;
2169                 wake_up = 1;
2170         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
2171                 CDEBUG(D_HA, "waking for completed recovery\n");
2172                 wake_up = 1;
2173         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
2174                 CDEBUG(D_HA,
2175                        "accepting transno gaps is explicitly allowed by fail_lock, waking up (%lld)\n",
2176                        next_transno);
2177                 obd->obd_next_recovery_transno = req_transno;
2178                 wake_up = 1;
2179         }
2180         spin_unlock(&obd->obd_recovery_task_lock);
2181         return wake_up;
2182 }
2183
2184 static int check_for_next_lock(struct lu_target *lut)
2185 {
2186         struct obd_device *obd = lut->lut_obd;
2187         int wake_up = 0;
2188
2189         spin_lock(&obd->obd_recovery_task_lock);
2190         if (!list_empty(&obd->obd_lock_replay_queue)) {
2191                 CDEBUG(D_HA, "waking for next lock\n");
2192                 wake_up = 1;
2193         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
2194                 CDEBUG(D_HA, "waking for completed lock replay\n");
2195                 wake_up = 1;
2196         } else if (obd->obd_abort_recovery) {
2197                 CDEBUG(D_HA, "waking for aborted recovery\n");
2198                 wake_up = 1;
2199         } else if (obd->obd_recovery_expired) {
2200                 CDEBUG(D_HA, "waking for expired recovery\n");
2201                 wake_up = 1;
2202         }
2203         spin_unlock(&obd->obd_recovery_task_lock);
2204
2205         return wake_up;
2206 }
2207
2208 static int check_update_llog(struct lu_target *lut)
2209 {
2210         struct obd_device *obd = lut->lut_obd;
2211         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2212
2213         if (obd->obd_abort_recovery) {
2214                 CDEBUG(D_HA, "waking for aborted recovery\n");
2215                 return 1;
2216         }
2217
2218         if (atomic_read(&tdtd->tdtd_recovery_threads_count) == 0) {
2219                 CDEBUG(D_HA, "waking for completion of reading update log\n");
2220                 return 1;
2221         }
2222
2223         return 0;
2224 }
2225
2226 /**
2227  * wait for recovery events,
2228  * check its status with help of check_routine
2229  * evict dead clients via health_check
2230  */
2231 static int target_recovery_overseer(struct lu_target *lut,
2232                                     int (*check_routine)(struct lu_target *),
2233                                     int (*health_check)(struct obd_export *))
2234 {
2235         struct obd_device *obd = lut->lut_obd;
2236         struct target_distribute_txn_data *tdtd;
2237         time64_t last = 0;
2238         time64_t now;
2239 repeat:
2240         if (obd->obd_recovering && obd->obd_recovery_start == 0) {
2241                 now = ktime_get_seconds();
2242                 if (now - last > 600) {
2243                         LCONSOLE_INFO("%s: in recovery but waiting for the first client to connect\n",
2244                                       obd->obd_name);
2245                         last = now;
2246                 }
2247         }
2248         if (obd->obd_recovery_start != 0 && ktime_get_seconds() >=
2249               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
2250                 __u64 next_update_transno = 0;
2251
2252                 /*
2253                  * Only abort the recovery if there are no update recovery
2254                  * left in the queue
2255                  */
2256                 spin_lock(&obd->obd_recovery_task_lock);
2257                 if (!obd->obd_abort_recov_mdt && lut->lut_tdtd) {
2258                         next_update_transno =
2259                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2260
2261                         tdtd = lut->lut_tdtd;
2262                         /*
2263                          * If next_update_transno == 0, it probably because
2264                          * updatelog retrieve threads did not get any records
2265                          * yet, let's wait those threads stopped
2266                          */
2267                         if (next_update_transno == 0) {
2268                                 spin_unlock(&obd->obd_recovery_task_lock);
2269
2270                                 while (wait_event_timeout(
2271                                         tdtd->tdtd_recovery_threads_waitq,
2272                                         check_update_llog(lut),
2273                                         cfs_time_seconds(60)) == 0);
2274
2275                                 spin_lock(&obd->obd_recovery_task_lock);
2276                                 next_update_transno =
2277                                         distribute_txn_get_next_transno(tdtd);
2278                         }
2279                 }
2280
2281                 if (next_update_transno != 0 && !obd->obd_abort_recovery) {
2282                         obd->obd_next_recovery_transno = next_update_transno;
2283                         spin_unlock(&obd->obd_recovery_task_lock);
2284                         /*
2285                          * Disconnect unfinished exports from clients, and
2286                          * keep connection from MDT to make sure the update
2287                          * recovery will still keep trying until some one
2288                          * manually abort the recovery
2289                          */
2290                         class_disconnect_stale_exports(obd,
2291                                                 exp_finished_or_from_mdt);
2292                         /* Abort all of replay & replay lock req from clients */
2293                         abort_req_replay_queue(obd);
2294                         abort_lock_replay_queue(obd);
2295                         CDEBUG(D_HA,
2296                                "%s: there are still update replay (%#llx)in the queue.\n",
2297                                obd->obd_name, next_update_transno);
2298                 } else {
2299                         obd->obd_abort_recovery = 1;
2300                         spin_unlock(&obd->obd_recovery_task_lock);
2301                         CWARN("%s recovery is aborted by hard timeout\n",
2302                               obd->obd_name);
2303                 }
2304         }
2305
2306         while (wait_event_timeout(obd->obd_next_transno_waitq,
2307                                   check_routine(lut),
2308                                   cfs_time_seconds(60)) == 0)
2309                 ; /* wait indefinitely for event, but don't trigger watchdog */
2310
2311         if (obd->obd_abort_recovery) {
2312                 CWARN("recovery is aborted, evict exports in recovery\n");
2313                 if (lut->lut_tdtd != NULL) {
2314                         tdtd = lut->lut_tdtd;
2315                         /*
2316                          * Let's wait all of the update log recovery thread
2317                          * finished
2318                          */
2319                         wait_event_idle(
2320                                 tdtd->tdtd_recovery_threads_waitq,
2321                                 atomic_read(&tdtd->tdtd_recovery_threads_count)
2322                                 == 0);
2323                         /* Then abort the update recovery list */
2324                         dtrq_list_destroy(lut->lut_tdtd);
2325                 }
2326
2327                 /** evict exports which didn't finish recovery yet */
2328                 class_disconnect_stale_exports(obd, exp_finished);
2329                 return 1;
2330         } else if (obd->obd_recovery_expired) {
2331                 obd->obd_recovery_expired = 0;
2332
2333                 /** If some clients died being recovered, evict them */
2334                 LCONSOLE_WARN("%s: recovery is timed out, evict stale exports\n",
2335                               obd->obd_name);
2336                 /** evict cexports with no replay in queue, they are stalled */
2337                 class_disconnect_stale_exports(obd, health_check);
2338
2339                 /** continue with VBR */
2340                 spin_lock(&obd->obd_dev_lock);
2341                 obd->obd_version_recov = 1;
2342                 spin_unlock(&obd->obd_dev_lock);
2343                 /**
2344                  * reset timer, recovery will proceed with versions now,
2345                  * timeout is set just to handle reconnection delays
2346                  */
2347                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2348                 /**
2349                  * Wait for recovery events again, after evicting bad clients
2350                  */
2351                 goto repeat;
2352         }
2353         return 0;
2354 }
2355
2356 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2357 {
2358         struct obd_device *obd = lut->lut_obd;
2359         struct ptlrpc_request *req = NULL;
2360
2361         CDEBUG(D_HA, "Waiting for lock\n");
2362         if (target_recovery_overseer(lut, check_for_next_lock,
2363                                      exp_lock_replay_healthy))
2364                 abort_lock_replay_queue(obd);
2365
2366         spin_lock(&obd->obd_recovery_task_lock);
2367         if (!list_empty(&obd->obd_lock_replay_queue)) {
2368                 req = list_entry(obd->obd_lock_replay_queue.next,
2369                                      struct ptlrpc_request, rq_list);
2370                 list_del_init(&req->rq_list);
2371                 spin_unlock(&obd->obd_recovery_task_lock);
2372         } else {
2373                 spin_unlock(&obd->obd_recovery_task_lock);
2374                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2375                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2376                 /** evict exports failed VBR */
2377                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2378         }
2379         return req;
2380 }
2381
2382 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2383 {
2384         struct ptlrpc_request *req = NULL;
2385
2386         spin_lock(&obd->obd_recovery_task_lock);
2387         if (!list_empty(&obd->obd_final_req_queue)) {
2388                 req = list_entry(obd->obd_final_req_queue.next,
2389                                      struct ptlrpc_request, rq_list);
2390                 list_del_init(&req->rq_list);
2391                 spin_unlock(&obd->obd_recovery_task_lock);
2392                 if (req->rq_export->exp_in_recovery) {
2393                         spin_lock(&req->rq_export->exp_lock);
2394                         req->rq_export->exp_in_recovery = 0;
2395                         spin_unlock(&req->rq_export->exp_lock);
2396                 }
2397         } else {
2398                 spin_unlock(&obd->obd_recovery_task_lock);
2399         }
2400         return req;
2401 }
2402
2403 static void handle_recovery_req(struct ptlrpc_thread *thread,
2404                                 struct ptlrpc_request *req,
2405                                 svc_handler_t handler)
2406 {
2407         ENTRY;
2408
2409         /**
2410          * export can be evicted during recovery, no need to handle replays for
2411          * it after that, discard such request silently
2412          */
2413         if (req->rq_export->exp_disconnected)
2414                 RETURN_EXIT;
2415
2416         req->rq_session.lc_thread = thread;
2417         req->rq_svc_thread = thread;
2418         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2419
2420         /* thread context */
2421         lu_context_enter(&thread->t_env->le_ctx);
2422         (void)handler(req);
2423         lu_context_exit(&thread->t_env->le_ctx);
2424
2425         req->rq_svc_thread->t_env->le_ses = NULL;
2426
2427         /* don't reset timer for final stage */
2428         if (!exp_finished(req->rq_export)) {
2429                 timeout_t timeout = obd_timeout;
2430
2431                 /**
2432                  * Add request @timeout to the recovery time so next request from
2433                  * this client may come in recovery time
2434                  */
2435                 if (!AT_OFF) {
2436                         struct ptlrpc_service_part *svcpt;
2437                         timeout_t est_timeout;
2438
2439                         svcpt = req->rq_rqbd->rqbd_svcpt;
2440                         /*
2441                          * If the server sent early reply for this request,
2442                          * the client will recalculate the timeout according to
2443                          * current server estimate service time, so we will
2444                          * use the maxium timeout here for waiting the client
2445                          * sending the next req
2446                          */
2447                         est_timeout = at_get(&svcpt->scp_at_estimate);
2448                         timeout = max_t(timeout_t, at_est2timeout(est_timeout),
2449                                         lustre_msg_get_timeout(req->rq_reqmsg));
2450                         /*
2451                          * Add 2 net_latency, one for balance rq_deadline
2452                          * (see ptl_send_rpc), one for resend the req to server,
2453                          * Note: client will pack net_latency in replay req
2454                          * (see ptlrpc_replay_req)
2455                          */
2456                         timeout += 2 * lustre_msg_get_service_timeout(req->rq_reqmsg);
2457                 }
2458                 extend_recovery_timer(class_exp2obd(req->rq_export), timeout,
2459                                       true);
2460         }
2461         EXIT;
2462 }
2463
2464 /** Checking routines for recovery */
2465 static int check_for_recovery_ready(struct lu_target *lut)
2466 {
2467         struct obd_device *obd = lut->lut_obd;
2468         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2469
2470         CDEBUG(D_HA,
2471                "connected %d stale %d max_recoverable_clients %d abort %d expired %d\n",
2472                clnts, obd->obd_stale_clients,
2473                atomic_read(&obd->obd_max_recoverable_clients),
2474                obd->obd_abort_recovery, obd->obd_recovery_expired);
2475
2476         if (!obd->obd_abort_recovery && !obd->obd_recovery_expired) {
2477                 LASSERT(clnts <=
2478                         atomic_read(&obd->obd_max_recoverable_clients));
2479                 if (clnts + obd->obd_stale_clients <
2480                     atomic_read(&obd->obd_max_recoverable_clients))
2481                         return 0;
2482         }
2483
2484         if (!obd->obd_abort_recov_mdt && lut->lut_tdtd != NULL) {
2485                 if (!lut->lut_tdtd->tdtd_replay_ready &&
2486                     !obd->obd_abort_recovery && !obd->obd_stopping) {
2487                         /*
2488                          * Let's extend recovery timer, in case the recovery
2489                          * timer expired, and some clients got evicted
2490                          */
2491                         extend_recovery_timer(obd, obd->obd_recovery_timeout,
2492                                               true);
2493                         CDEBUG(D_HA,
2494                                "%s update recovery is not ready, extend recovery %d\n",
2495                                obd->obd_name, obd->obd_recovery_timeout);
2496                         return 0;
2497                 }
2498         }
2499
2500         return 1;
2501 }
2502
2503 enum {
2504         REQUEST_RECOVERY = 1,
2505         UPDATE_RECOVERY = 2,
2506 };
2507
2508 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2509 {
2510         __u64 transno = 0;
2511
2512         if (!list_empty(&obd->obd_req_replay_queue)) {
2513                 struct ptlrpc_request *req;
2514
2515                 req = list_entry(obd->obd_req_replay_queue.next,
2516                                  struct ptlrpc_request, rq_list);
2517                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2518         }
2519
2520         return transno;
2521 }
2522
2523 static __u64 get_next_transno(struct lu_target *lut, int *type)
2524 {
2525         struct obd_device *obd = lut->lut_obd;
2526         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2527         __u64 transno = 0;
2528         __u64 update_transno;
2529
2530         ENTRY;
2531
2532         transno = get_next_replay_req_transno(obd);
2533         if (type != NULL)
2534                 *type = REQUEST_RECOVERY;
2535
2536         if (!tdtd || obd->obd_abort_recov_mdt)
2537                 RETURN(transno);
2538
2539         update_transno = distribute_txn_get_next_transno(tdtd);
2540         if (transno == 0 || (transno >= update_transno &&
2541                              update_transno != 0)) {
2542                 transno = update_transno;
2543                 if (type != NULL)
2544                         *type = UPDATE_RECOVERY;
2545         }
2546
2547         RETURN(transno);
2548 }
2549
2550 /**
2551  * drop duplicate replay request
2552  *
2553  * Because the operation has been replayed by update recovery, the request
2554  * with the same transno will be dropped and also notify the client to send
2555  * next replay request.
2556  *
2557  * \param[in] env       execution environment
2558  * \param[in] obd       failover obd device
2559  * \param[in] req       request to be dropped
2560  */
2561 static void drop_duplicate_replay_req(struct lu_env *env,
2562                                       struct obd_device *obd,
2563                                       struct ptlrpc_request *req)
2564 {
2565         DEBUG_REQ(D_HA, req,
2566                   "remove t%lld from %s because duplicate update records found",
2567                   lustre_msg_get_transno(req->rq_reqmsg),
2568                   libcfs_nidstr(&req->rq_peer.nid));
2569
2570         /*
2571          * Right now, only for MDS reint operation update replay and
2572          * normal request replay can have the same transno
2573          */
2574         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT) {
2575                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2576                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2577                 if (likely(req->rq_export))
2578                         target_committed_to_req(req);
2579                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2580                 target_send_reply(req, req->rq_status, 0);
2581         } else {
2582                 DEBUG_REQ(D_ERROR, req, "wrong opc from %s",
2583                 libcfs_nidstr(&req->rq_peer.nid));
2584         }
2585         target_exp_dequeue_req_replay(req);
2586         target_request_copy_put(req);
2587         obd->obd_replayed_requests++;
2588 }
2589
2590 #define WATCHDOG_TIMEOUT (obd_timeout * 10)
2591
2592 static void replay_request_or_update(struct lu_env *env,
2593                                      struct lu_target *lut,
2594                                      struct target_recovery_data *trd,
2595                                      struct ptlrpc_thread *thread)
2596 {
2597         struct obd_device *obd = lut->lut_obd;
2598         struct ptlrpc_request *req = NULL;
2599         int type;
2600         __u64 transno;
2601
2602         ENTRY;
2603
2604         CDEBUG(D_HA, "Waiting for transno %lld\n",
2605                obd->obd_next_recovery_transno);
2606
2607         /* Replay all of request and update by transno */
2608         do {
2609                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2610
2611                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2612
2613                 /**
2614                  * It is needed to extend recovery window above
2615                  *  recovery_time_soft. Extending is possible only in the
2616                  *  end of recovery window (see more details in
2617                  *  handle_recovery_req()).
2618                  */
2619                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2620
2621                 if (target_recovery_overseer(lut, check_for_next_transno,
2622                                         exp_req_replay_healthy_or_from_mdt)) {
2623                         abort_req_replay_queue(obd);
2624                         abort_lock_replay_queue(obd);
2625                         goto abort;
2626                 }
2627
2628                 spin_lock(&obd->obd_recovery_task_lock);
2629                 transno = get_next_transno(lut, &type);
2630                 if (type == REQUEST_RECOVERY && transno != 0) {
2631                         /*
2632                          * Drop replay request from client side, if the
2633                          * replay has been executed by update with the
2634                          * same transno
2635                          */
2636                         req = list_entry(obd->obd_req_replay_queue.next,
2637                                         struct ptlrpc_request, rq_list);
2638
2639                         list_del_init(&req->rq_list);
2640                         obd->obd_requests_queued_for_recovery--;
2641                         spin_unlock(&obd->obd_recovery_task_lock);
2642
2643                         /*
2644                          * Let's check if the request has been redone by
2645                          * update replay
2646                          */
2647                         if (is_req_replayed_by_update(req)) {
2648                                 struct distribute_txn_replay_req *dtrq;
2649
2650                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2651                                                                       transno);
2652                                 LASSERT(dtrq != NULL);
2653                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2654                                 list_del_init(&dtrq->dtrq_list);
2655                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2656                                 dtrq_destroy(dtrq);
2657
2658                                 drop_duplicate_replay_req(env, obd, req);
2659
2660                                 continue;
2661                         }
2662
2663                         LASSERT(trd->trd_processing_task == current->pid);
2664                         DEBUG_REQ(D_HA, req, "processing x%llu t%lld from %s",
2665                                   req->rq_xid,
2666                                   lustre_msg_get_transno(req->rq_reqmsg),
2667                                   libcfs_nidstr(&req->rq_peer.nid));
2668
2669                         ptlrpc_watchdog_init(&thread->t_watchdog,
2670                                              WATCHDOG_TIMEOUT);
2671                         handle_recovery_req(thread, req,
2672                                             trd->trd_recovery_handler);
2673                         ptlrpc_watchdog_disable(&thread->t_watchdog);
2674
2675                         /**
2676                          * bz18031: increase next_recovery_transno before
2677                          * target_request_copy_put() will drop exp_rpc reference
2678                          */
2679                         spin_lock(&obd->obd_recovery_task_lock);
2680                         obd->obd_next_recovery_transno++;
2681                         spin_unlock(&obd->obd_recovery_task_lock);
2682                         target_exp_dequeue_req_replay(req);
2683                         target_request_copy_put(req);
2684                         obd->obd_replayed_requests++;
2685                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2686                         struct distribute_txn_replay_req *dtrq;
2687                         int rc;
2688
2689                         spin_unlock(&obd->obd_recovery_task_lock);
2690
2691                         LASSERT(tdtd != NULL);
2692                         dtrq = distribute_txn_get_next_req(tdtd);
2693                         lu_context_enter(&thread->t_env->le_ctx);
2694                         ptlrpc_watchdog_init(&thread->t_watchdog,
2695                                              WATCHDOG_TIMEOUT);
2696                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2697                         ptlrpc_watchdog_disable(&thread->t_watchdog);
2698                         lu_context_exit(&thread->t_env->le_ctx);
2699                         extend_recovery_timer(obd, obd_timeout, true);
2700
2701                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2702                                 CDEBUG(D_HA,
2703                                        "Move x%llu t%llu to finish list\n",
2704                                        dtrq->dtrq_xid,
2705                                        dtrq->dtrq_master_transno);
2706
2707                                 /* Add it to the replay finish list */
2708                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2709                                 list_add(&dtrq->dtrq_list,
2710                                          &tdtd->tdtd_replay_finish_list);
2711                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2712
2713                                 spin_lock(&obd->obd_recovery_task_lock);
2714                                 if (transno == obd->obd_next_recovery_transno)
2715                                         obd->obd_next_recovery_transno++;
2716                                 else if (transno >
2717                                          obd->obd_next_recovery_transno)
2718                                         obd->obd_next_recovery_transno =
2719                                                                 transno + 1;
2720                                 spin_unlock(&obd->obd_recovery_task_lock);
2721                         } else {
2722                                 dtrq_destroy(dtrq);
2723                         }
2724                 } else {
2725                         spin_unlock(&obd->obd_recovery_task_lock);
2726 abort:
2727                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2728                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2729                         /** evict exports failed VBR */
2730                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2731                         break;
2732                 }
2733         } while (1);
2734 }
2735
2736 static int target_recovery_thread(void *arg)
2737 {
2738         struct lu_target *lut = arg;
2739         struct obd_device *obd = lut->lut_obd;
2740         struct ptlrpc_request *req;
2741         struct target_recovery_data *trd = &obd->obd_recovery_data;
2742         unsigned long delta;
2743         struct lu_env *env;
2744         struct ptlrpc_thread *thread = NULL;
2745         int rc = 0;
2746
2747         ENTRY;
2748         unshare_fs_struct();
2749         OBD_ALLOC_PTR(thread);
2750         if (thread == NULL)
2751                 RETURN(-ENOMEM);
2752
2753         OBD_ALLOC_PTR(env);
2754         if (env == NULL)
2755                 GOTO(out_thread, rc = -ENOMEM);
2756         rc = lu_env_add(env);
2757         if (rc)
2758                 GOTO(out_env, rc);
2759
2760         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2761         if (rc)
2762                 GOTO(out_env_remove, rc);
2763
2764         thread->t_env = env;
2765         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2766         thread->t_task = current;
2767         env->le_ctx.lc_thread = thread;
2768         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2769
2770         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2771                current->pid);
2772         trd->trd_processing_task = current->pid;
2773
2774         spin_lock(&obd->obd_dev_lock);
2775         obd->obd_recovering = 1;
2776         spin_unlock(&obd->obd_dev_lock);
2777         complete(&trd->trd_starting);
2778
2779         /* first of all, we have to know the first transno to replay */
2780         if (target_recovery_overseer(lut, check_for_recovery_ready,
2781                                      exp_connect_healthy)) {
2782                 abort_req_replay_queue(obd);
2783                 abort_lock_replay_queue(obd);
2784                 if (lut->lut_tdtd != NULL)
2785                         dtrq_list_destroy(lut->lut_tdtd);
2786         }
2787
2788         /* next stage: replay requests or update */
2789         delta = jiffies;
2790         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2791                atomic_read(&obd->obd_req_replay_clients),
2792                obd->obd_next_recovery_transno);
2793         replay_request_or_update(env, lut, trd, thread);
2794
2795         /**
2796          * The second stage: replay locks
2797          */
2798         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2799                atomic_read(&obd->obd_lock_replay_clients));
2800         while ((req = target_next_replay_lock(lut))) {
2801                 LASSERT(trd->trd_processing_task == current->pid);
2802                 DEBUG_REQ(D_HA, req, "processing lock from %s:",
2803                           libcfs_nidstr(&req->rq_peer.nid));
2804                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_LOCK_REPLAY)) {
2805                         req->rq_status = -ENODEV;
2806                         target_request_copy_put(req);
2807                         continue;
2808                 }
2809                 handle_recovery_req(thread, req,
2810                                     trd->trd_recovery_handler);
2811                 target_request_copy_put(req);
2812                 obd->obd_replayed_locks++;
2813         }
2814
2815         /**
2816          * The third stage: reply on final pings, at this moment all clients
2817          * must have request in final queue
2818          */
2819         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2820         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2821         /** Update server last boot epoch */
2822         tgt_boot_epoch_update(lut);
2823         /*
2824          * We drop recoverying flag to forward all new requests
2825          * to regular mds_handle() since now
2826          */
2827         spin_lock(&obd->obd_dev_lock);
2828         obd->obd_recovering = obd->obd_abort_recovery = 0;
2829         obd->obd_abort_recov_mdt = 0;
2830         spin_unlock(&obd->obd_dev_lock);
2831         spin_lock(&obd->obd_recovery_task_lock);
2832         target_cancel_recovery_timer(obd);
2833         spin_unlock(&obd->obd_recovery_task_lock);
2834         while ((req = target_next_final_ping(obd))) {
2835                 LASSERT(trd->trd_processing_task == current->pid);
2836                 DEBUG_REQ(D_HA, req, "processing final ping from %s:",
2837                           libcfs_nidstr(&req->rq_peer.nid));
2838                 handle_recovery_req(thread, req,
2839                                     trd->trd_recovery_handler);
2840                 /*
2841                  * Because the waiting client can not send ping to server,
2842                  * so we need refresh the last_request_time, to avoid the
2843                  * export is being evicted
2844                  */
2845                 ptlrpc_update_export_timer(req->rq_export, 0);
2846                 target_request_copy_put(req);
2847         }
2848
2849         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2850         CDEBUG(D_INFO, "4: recovery completed in %lus - %d/%d reqs/locks\n",
2851                delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2852         if (delta > OBD_RECOVERY_TIME_SOFT) {
2853                 CWARN("too long recovery - read logs\n");
2854                 libcfs_debug_dumplog();
2855         }
2856
2857         target_finish_recovery(lut);
2858         lu_context_fini(&env->le_ctx);
2859         trd->trd_processing_task = 0;
2860         complete_all(&trd->trd_finishing);
2861         tgt_io_thread_done(thread);
2862 out_env_remove:
2863         lu_env_remove(env);
2864 out_env:
2865         OBD_FREE_PTR(env);
2866 out_thread:
2867         OBD_FREE_PTR(thread);
2868         RETURN(rc);
2869 }
2870
2871 static int target_start_recovery_thread(struct lu_target *lut,
2872                                         svc_handler_t handler)
2873 {
2874         struct obd_device *obd = lut->lut_obd;
2875         int rc = 0;
2876         struct target_recovery_data *trd = &obd->obd_recovery_data;
2877         int index;
2878
2879         memset(trd, 0, sizeof(*trd));
2880         init_completion(&trd->trd_starting);
2881         init_completion(&trd->trd_finishing);
2882         trd->trd_recovery_handler = handler;
2883
2884         rc = server_name2index(obd->obd_name, &index, NULL);
2885         if (rc < 0)
2886                 return rc;
2887
2888         if (!IS_ERR(kthread_run(target_recovery_thread,
2889                                 lut, "tgt_recover_%d", index))) {
2890                 wait_for_completion(&trd->trd_starting);
2891                 LASSERT(obd->obd_recovering != 0);
2892         } else {
2893                 rc = -ECHILD;
2894         }
2895
2896         return rc;
2897 }
2898
2899 void target_stop_recovery_thread(struct obd_device *obd)
2900 {
2901         if (obd->obd_recovery_data.trd_processing_task > 0) {
2902                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2903                 /** recovery can be done but postrecovery is not yet */
2904                 spin_lock(&obd->obd_dev_lock);
2905                 if (obd->obd_recovering) {
2906                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2907                         obd->obd_abort_recovery = 1;
2908                         wake_up(&obd->obd_next_transno_waitq);
2909                 }
2910                 spin_unlock(&obd->obd_dev_lock);
2911                 wait_for_completion(&trd->trd_finishing);
2912         }
2913 }
2914 EXPORT_SYMBOL(target_stop_recovery_thread);
2915
2916 void target_recovery_fini(struct obd_device *obd)
2917 {
2918         class_disconnect_exports(obd);
2919         target_stop_recovery_thread(obd);
2920         target_cleanup_recovery(obd);
2921 }
2922 EXPORT_SYMBOL(target_recovery_fini);
2923
2924 static enum hrtimer_restart target_recovery_expired(struct hrtimer *timer)
2925 {
2926         struct obd_device *obd = container_of(timer, struct obd_device,
2927                                               obd_recovery_timer);
2928
2929         CDEBUG(D_HA,
2930                "%s: recovery timed out; %d clients are still in recovery after %llu seconds (%d clients connected)\n",
2931                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2932                ktime_get_seconds() - obd->obd_recovery_start,
2933                atomic_read(&obd->obd_connected_clients));
2934
2935         obd->obd_recovery_expired = 1;
2936         wake_up(&obd->obd_next_transno_waitq);
2937         return HRTIMER_NORESTART;
2938 }
2939
2940 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2941 {
2942         struct obd_device *obd = lut->lut_obd;
2943
2944         if (lut->lut_bottom->dd_rdonly)
2945                 return;
2946
2947         if (atomic_read(&obd->obd_max_recoverable_clients) == 0) {
2948                 /** Update server last boot epoch */
2949                 tgt_boot_epoch_update(lut);
2950                 return;
2951         }
2952
2953         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2954                "last_transno %llu\n", obd->obd_name,
2955                atomic_read(&obd->obd_max_recoverable_clients),
2956                obd->obd_last_committed);
2957         LASSERT(obd->obd_stopping == 0);
2958         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2959         obd->obd_recovery_start = 0;
2960         obd->obd_recovery_end = 0;
2961
2962         hrtimer_init(&obd->obd_recovery_timer, CLOCK_MONOTONIC,
2963                      HRTIMER_MODE_ABS);
2964         obd->obd_recovery_timer.function = &target_recovery_expired;
2965         target_start_recovery_thread(lut, handler);
2966 }
2967 EXPORT_SYMBOL(target_recovery_init);
2968
2969 static int target_process_req_flags(struct obd_device *obd,
2970                                     struct ptlrpc_request *req)
2971 {
2972         struct obd_export *exp = req->rq_export;
2973
2974         LASSERT(exp != NULL);
2975         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2976                 /* client declares he's ready to replay locks */
2977                 spin_lock(&exp->exp_lock);
2978                 if (exp->exp_req_replay_needed) {
2979                         exp->exp_req_replay_needed = 0;
2980                         spin_unlock(&exp->exp_lock);
2981
2982                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2983                         atomic_dec(&obd->obd_req_replay_clients);
2984                 } else {
2985                         spin_unlock(&exp->exp_lock);
2986                 }
2987         }
2988         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2989                 /*
2990                  * client declares he's ready to complete recovery
2991                  * so, we put the request on th final queue
2992                  */
2993                 spin_lock(&exp->exp_lock);
2994                 if (exp->exp_lock_replay_needed) {
2995                         exp->exp_lock_replay_needed = 0;
2996                         spin_unlock(&exp->exp_lock);
2997
2998                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
2999                         atomic_dec(&obd->obd_lock_replay_clients);
3000                 } else {
3001                         spin_unlock(&exp->exp_lock);
3002                 }
3003         }
3004         return 0;
3005 }
3006
3007 int target_queue_recovery_request(struct ptlrpc_request *req,
3008                                   struct obd_device *obd)
3009 {
3010         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
3011         struct ptlrpc_request *reqiter;
3012         int inserted = 0;
3013
3014         ENTRY;
3015
3016         if (obd->obd_recovery_data.trd_processing_task == current->pid) {
3017                 /* Processing the queue right now, don't re-add. */
3018                 RETURN(1);
3019         }
3020
3021         target_process_req_flags(obd, req);
3022
3023         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
3024                 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
3025                         if (cfs_fail_val == 1) {
3026                                 cfs_race_state = 1;
3027                                 cfs_fail_val = 0;
3028                                 wake_up(&cfs_race_waitq);
3029
3030                                 schedule_timeout_interruptible(
3031                                         cfs_time_seconds(1));
3032                         }
3033                 }
3034
3035                 /*
3036                  * client declares he's ready to complete recovery
3037                  * so, we put the request on th final queue
3038                  */
3039                 target_request_copy_get(req);
3040                 DEBUG_REQ(D_HA, req, "queue final req");
3041                 wake_up(&obd->obd_next_transno_waitq);
3042                 spin_lock(&obd->obd_recovery_task_lock);
3043                 if (obd->obd_recovering) {
3044                         struct ptlrpc_request *tmp;
3045                         struct ptlrpc_request *duplicate = NULL;
3046
3047                         if (likely(!req->rq_export->exp_replay_done)) {
3048                                 req->rq_export->exp_replay_done = 1;
3049                                 list_add_tail(&req->rq_list,
3050                                               &obd->obd_final_req_queue);
3051                                 spin_unlock(&obd->obd_recovery_task_lock);
3052                                 RETURN(0);
3053                         }
3054
3055                         /*
3056                          * XXX O(n), but only happens if final ping is
3057                          * timed out, probably reorganize the list as
3058                          * a hash list later
3059                          */
3060                         list_for_each_entry_safe(reqiter, tmp,
3061                                                  &obd->obd_final_req_queue,
3062                                                  rq_list) {
3063                                 if (reqiter->rq_export == req->rq_export) {
3064                                         list_del_init(&reqiter->rq_list);
3065                                         duplicate = reqiter;
3066                                         break;
3067                                 }
3068                         }
3069
3070                         list_add_tail(&req->rq_list,
3071                                       &obd->obd_final_req_queue);
3072                         req->rq_export->exp_replay_done = 1;
3073                         spin_unlock(&obd->obd_recovery_task_lock);
3074
3075                         if (duplicate != NULL) {
3076                                 DEBUG_REQ(D_HA, duplicate,
3077                                           "put prev final req");
3078                                 target_request_copy_put(duplicate);
3079                         }
3080                         RETURN(0);
3081                 } else {
3082                         spin_unlock(&obd->obd_recovery_task_lock);
3083                         target_request_copy_put(req);
3084                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
3085                 }
3086         }
3087         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
3088                 /* client declares he's ready to replay locks */
3089                 target_request_copy_get(req);
3090                 DEBUG_REQ(D_HA, req, "queue lock replay req");
3091                 wake_up(&obd->obd_next_transno_waitq);
3092                 spin_lock(&obd->obd_recovery_task_lock);
3093                 LASSERT(obd->obd_recovering);
3094                 /* usually due to recovery abort */
3095                 if (!req->rq_export->exp_in_recovery) {
3096                         spin_unlock(&obd->obd_recovery_task_lock);
3097                         target_request_copy_put(req);
3098                         RETURN(-ENOTCONN);
3099                 }
3100                 LASSERT(req->rq_export->exp_lock_replay_needed);
3101                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
3102                 spin_unlock(&obd->obd_recovery_task_lock);
3103                 RETURN(0);
3104         }
3105
3106         /*
3107          * CAVEAT EMPTOR: The incoming request message has been swabbed
3108          * (i.e. buflens etc are in my own byte order), but type-dependent
3109          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed.
3110          */
3111
3112         if (!transno) {
3113                 INIT_LIST_HEAD(&req->rq_list);
3114                 DEBUG_REQ(D_HA, req, "not queueing");
3115                 RETURN(1);
3116         }
3117
3118         /*
3119          * If we're processing the queue, we want don't want to queue this
3120          * message.
3121          *
3122          * Also, if this request has a transno less than the one we're waiting
3123          * for, we should process it now.  It could (and currently always will)
3124          * be an open request for a descriptor that was opened some time ago.
3125          *
3126          * Also, a resent, replayed request that has already been
3127          * handled will pass through here and be processed immediately.
3128          */
3129         CDEBUG(D_HA,
3130                "Next recovery transno: %llu, current: %llu, replaying\n",
3131                obd->obd_next_recovery_transno, transno);
3132
3133         /*
3134          * If the request has been replayed by update replay, then sends this
3135          * request to the recovery thread (replay_request_or_update()), where
3136          * it will be handled
3137          */
3138         spin_lock(&obd->obd_recovery_task_lock);
3139         if (transno < obd->obd_next_recovery_transno &&
3140             !is_req_replayed_by_update(req)) {
3141                 /* Processing the queue right now, don't re-add. */
3142                 LASSERT(list_empty(&req->rq_list));
3143                 spin_unlock(&obd->obd_recovery_task_lock);
3144                 RETURN(1);
3145         }
3146         spin_unlock(&obd->obd_recovery_task_lock);
3147
3148         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
3149                 RETURN(0);
3150
3151         target_request_copy_get(req);
3152         if (!req->rq_export->exp_in_recovery) {
3153                 target_request_copy_put(req);
3154                 RETURN(-ENOTCONN);
3155         }
3156         LASSERT(req->rq_export->exp_req_replay_needed);
3157
3158         if (target_exp_enqueue_req_replay(req)) {
3159                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
3160                 target_request_copy_put(req);
3161                 RETURN(0);
3162         }
3163
3164         /* XXX O(n^2) */
3165         spin_lock(&obd->obd_recovery_task_lock);
3166         LASSERT(obd->obd_recovering);
3167         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
3168                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
3169                         list_add_tail(&req->rq_list, &reqiter->rq_list);
3170                         inserted = 1;
3171                         goto added;
3172                 }
3173
3174                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
3175                              transno)) {
3176                         DEBUG_REQ(D_ERROR, req,
3177                                   "dropping replay: transno has been claimed by another client");
3178                         spin_unlock(&obd->obd_recovery_task_lock);
3179                         target_exp_dequeue_req_replay(req);
3180                         target_request_copy_put(req);
3181                         RETURN(0);
3182                 }
3183         }
3184 added:
3185         if (!inserted)
3186                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
3187
3188         obd->obd_requests_queued_for_recovery++;
3189         spin_unlock(&obd->obd_recovery_task_lock);
3190         wake_up(&obd->obd_next_transno_waitq);
3191         RETURN(0);
3192 }
3193
3194 void target_committed_to_req(struct ptlrpc_request *req)
3195 {
3196         struct obd_export *exp = req->rq_export;
3197
3198         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
3199                 lustre_msg_set_last_committed(req->rq_repmsg,
3200                                               exp->exp_last_committed);
3201         else
3202                 DEBUG_REQ(D_IOCTL, req,
3203                           "not sending last_committed update (%d/%d)",
3204                           exp->exp_obd->obd_no_transno,
3205                           req->rq_repmsg == NULL);
3206
3207         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
3208                exp->exp_last_committed, req->rq_transno, req->rq_xid);
3209 }
3210
3211 #endif /* HAVE_SERVER_SUPPORT */
3212
3213 /**
3214  * Packs current SLV and Limit into \a req.
3215  */
3216 int target_pack_pool_reply(struct ptlrpc_request *req)
3217 {
3218         struct obd_device *obd;
3219
3220         ENTRY;
3221
3222         /*
3223          * Check that we still have all structures alive as this may
3224          * be some late RPC at shutdown time.
3225          */
3226         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
3227                      !exp_connect_lru_resize(req->rq_export))) {
3228                 lustre_msg_set_slv(req->rq_repmsg, 0);
3229                 lustre_msg_set_limit(req->rq_repmsg, 0);
3230                 RETURN(0);
3231         }
3232
3233         /* OBD is alive here as export is alive, which we checked above. */
3234         obd = req->rq_export->exp_obd;
3235
3236         read_lock(&obd->obd_pool_lock);
3237         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
3238         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
3239         read_unlock(&obd->obd_pool_lock);
3240
3241         RETURN(0);
3242 }
3243
3244 static int target_send_reply_msg(struct ptlrpc_request *req,
3245                                  int rc, int fail_id)
3246 {
3247         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
3248                 DEBUG_REQ(D_ERROR, req, "dropping reply");
3249                 return -ECOMM;
3250         }
3251         /*
3252          * We can have a null rq_reqmsg in the event of bad signature or
3253          * no context when unwrapping
3254          */
3255         if (req->rq_reqmsg &&
3256             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
3257             OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
3258                 return -ECOMM;
3259
3260         if (unlikely(rc)) {
3261                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
3262                 req->rq_status = rc;
3263                 return ptlrpc_send_error(req, 1);
3264         }
3265         DEBUG_REQ(D_NET, req, "sending reply");
3266
3267         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
3268 }
3269
3270 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
3271 {
3272         struct ptlrpc_service_part *svcpt;
3273         int netrc;
3274         struct ptlrpc_reply_state *rs;
3275         struct obd_export *exp;
3276
3277         ENTRY;
3278
3279         if (req->rq_no_reply) {
3280                 EXIT;
3281                 return;
3282         }
3283
3284         svcpt = req->rq_rqbd->rqbd_svcpt;
3285         rs = req->rq_reply_state;
3286         if (rs == NULL || !rs->rs_difficult) {
3287                 /* no notifiers */
3288                 target_send_reply_msg(req, rc, fail_id);
3289                 EXIT;
3290                 return;
3291         }
3292
3293         /* must be an export if locks saved */
3294         LASSERT(req->rq_export != NULL);
3295         /* req/reply consistent */
3296         LASSERT(rs->rs_svcpt == svcpt);
3297
3298         /* "fresh" reply */
3299         LASSERT(!rs->rs_scheduled);
3300         LASSERT(!rs->rs_scheduled_ever);
3301         LASSERT(!rs->rs_handled);
3302         LASSERT(!rs->rs_sent);
3303         LASSERT(!rs->rs_unlinked);
3304         LASSERT(rs->rs_export == NULL);
3305         LASSERT(list_empty(&rs->rs_obd_list));
3306         LASSERT(list_empty(&rs->rs_exp_list));
3307
3308         exp = class_export_get(req->rq_export);
3309
3310         /* disable reply scheduling while I'm setting up */
3311         rs->rs_scheduled = 1;
3312         rs->rs_sent      = 0;
3313         rs->rs_unlinked  = 0;
3314         rs->rs_xid       = req->rq_xid;
3315         rs->rs_transno   = req->rq_transno;
3316         rs->rs_export    = exp;
3317         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
3318
3319         spin_lock(&exp->exp_uncommitted_replies_lock);
3320         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
3321                rs->rs_transno, exp->exp_last_committed);
3322         if (rs->rs_transno > exp->exp_last_committed) {
3323                 /* not committed already */
3324                 list_add_tail(&rs->rs_obd_list,
3325                                   &exp->exp_uncommitted_replies);
3326         }
3327         spin_unlock(&exp->exp_uncommitted_replies_lock);
3328
3329         spin_lock(&exp->exp_lock);
3330         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
3331         spin_unlock(&exp->exp_lock);
3332
3333         netrc = target_send_reply_msg(req, rc, fail_id);
3334
3335         spin_lock(&svcpt->scp_rep_lock);
3336
3337         atomic_inc(&svcpt->scp_nreps_difficult);
3338
3339         if (netrc != 0) {
3340                 /*
3341                  * error sending: reply is off the net.  Also we need +1
3342                  * reply ref until ptlrpc_handle_rs() is done
3343                  * with the reply state (if the send was successful, there
3344                  * would have been +1 ref for the net, which
3345                  * reply_out_callback leaves alone)
3346                  */
3347                 rs->rs_sent = 1;
3348                 rs->rs_unlinked = 1;
3349                 ptlrpc_rs_addref(rs);
3350         }
3351
3352         spin_lock(&rs->rs_lock);
3353         if (rs->rs_transno <= exp->exp_last_committed ||
3354             (rs->rs_unlinked && !rs->rs_no_ack) ||
3355             list_empty(&rs->rs_exp_list) ||     /* completed already */
3356             list_empty(&rs->rs_obd_list)) {
3357                 CDEBUG(D_HA, "Schedule reply immediately\n");
3358                 ptlrpc_dispatch_difficult_reply(rs);
3359         } else {
3360                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
3361                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
3362         }
3363         spin_unlock(&rs->rs_lock);
3364         spin_unlock(&svcpt->scp_rep_lock);
3365         EXIT;
3366 }
3367
3368 enum ldlm_mode lck_compat_array[] = {
3369         [LCK_EX]    = LCK_COMPAT_EX,
3370         [LCK_PW]    = LCK_COMPAT_PW,
3371         [LCK_PR]    = LCK_COMPAT_PR,
3372         [LCK_CW]    = LCK_COMPAT_CW,
3373         [LCK_CR]    = LCK_COMPAT_CR,
3374         [LCK_NL]    = LCK_COMPAT_NL,
3375         [LCK_GROUP] = LCK_COMPAT_GROUP,
3376         [LCK_COS]   = LCK_COMPAT_COS,
3377 };
3378
3379 /**
3380  * Rather arbitrary mapping from LDLM error codes to errno values. This should
3381  * not escape to the user level.
3382  */
3383 int ldlm_error2errno(enum ldlm_error error)
3384 {
3385         int result;
3386
3387         switch (error) {
3388         case ELDLM_OK:
3389         case ELDLM_LOCK_MATCHED:
3390                 result = 0;
3391                 break;
3392         case ELDLM_LOCK_CHANGED:
3393                 result = -ESTALE;
3394                 break;
3395         case ELDLM_LOCK_ABORTED:
3396                 result = -ENAVAIL;
3397                 break;
3398         case ELDLM_LOCK_REPLACED:
3399                 result = -ESRCH;
3400                 break;
3401         case ELDLM_NO_LOCK_DATA:
3402                 result = -ENOENT;
3403                 break;
3404         case ELDLM_NAMESPACE_EXISTS:
3405                 result = -EEXIST;
3406                 break;
3407         case ELDLM_BAD_NAMESPACE:
3408                 result = -EBADF;
3409                 break;
3410         default:
3411                 if (((int)error) < 0) { /* cast to signed type */
3412                         result = error; /* as ldlm_error can be unsigned */
3413                 } else {
3414                         CERROR("Invalid DLM result code: %d\n", error);
3415                         result = -EPROTO;
3416                 }
3417         }
3418         return result;
3419 }
3420 EXPORT_SYMBOL(ldlm_error2errno);
3421
3422 /**
3423  * Dual to ldlm_error2errno(): maps errno values back to enum ldlm_error.
3424  */
3425 enum ldlm_error ldlm_errno2error(int err_no)
3426 {
3427         int error;
3428
3429         switch (err_no) {
3430         case 0:
3431                 error = ELDLM_OK;
3432                 break;
3433         case -ESTALE:
3434                 error = ELDLM_LOCK_CHANGED;
3435                 break;
3436         case -ENAVAIL:
3437                 error = ELDLM_LOCK_ABORTED;
3438                 break;
3439         case -ESRCH:
3440                 error = ELDLM_LOCK_REPLACED;
3441                 break;
3442         case -ENOENT:
3443                 error = ELDLM_NO_LOCK_DATA;
3444                 break;
3445         case -EEXIST:
3446                 error = ELDLM_NAMESPACE_EXISTS;
3447                 break;
3448         case -EBADF:
3449                 error = ELDLM_BAD_NAMESPACE;
3450                 break;
3451         default:
3452                 error = err_no;
3453         }
3454         return error;
3455 }
3456
3457 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3458 void ldlm_dump_export_locks(struct obd_export *exp)
3459 {
3460         spin_lock(&exp->exp_locks_list_guard);
3461         if (!list_empty(&exp->exp_locks_list)) {
3462                 struct ldlm_lock *lock;
3463
3464                 CERROR("dumping locks for export %p, ignore if the unmount doesn't hang\n",
3465                        exp);
3466                 list_for_each_entry(lock, &exp->exp_locks_list,
3467                                         l_exp_refs_link)
3468                         LDLM_ERROR(lock, "lock:");
3469         }
3470         spin_unlock(&exp->exp_locks_list_guard);
3471 }
3472 #endif
3473
3474 #ifdef HAVE_SERVER_SUPPORT
3475 static inline const char *bulk2type(struct ptlrpc_request *req)
3476 {
3477         if (req->rq_bulk_read)
3478                 return "READ";
3479         if (req->rq_bulk_write)
3480                 return "WRITE";
3481         return "UNKNOWN";
3482 }
3483
3484 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc)
3485 {
3486         struct ptlrpc_request *req = desc->bd_req;
3487         time64_t start = ktime_get_seconds();
3488         time64_t deadline;
3489         int rc = 0;
3490
3491         ENTRY;
3492
3493         /* If there is eviction in progress, wait for it to finish. */
3494         wait_event_idle(
3495                 exp->exp_obd->obd_evict_inprogress_waitq,
3496                 !atomic_read(&exp->exp_obd->obd_evict_inprogress));
3497
3498         /* Check if client was evicted or reconnected already. */
3499         if (exp->exp_failed ||
3500             exp->exp_conn_cnt > lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3501                 rc = -ENOTCONN;
3502         } else {
3503                 if (req->rq_bulk_read)
3504                         rc = sptlrpc_svc_wrap_bulk(req, desc);
3505
3506                 if (OCD_HAS_FLAG(&exp->exp_connect_data, BULK_MBITS))
3507                         req->rq_mbits = lustre_msg_get_mbits(req->rq_reqmsg);
3508                 else /* old version, bulk matchbits is rq_xid */
3509                         req->rq_mbits = req->rq_xid;
3510
3511                 if (rc == 0)
3512                         rc = ptlrpc_start_bulk_transfer(desc);
3513         }
3514
3515         if (rc < 0) {
3516                 DEBUG_REQ(D_ERROR, req, "bulk %s failed: rc = %d",
3517                           bulk2type(req), rc);
3518                 RETURN(rc);
3519         }
3520
3521         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
3522                 ptlrpc_abort_bulk(desc);
3523                 RETURN(0);
3524         }
3525
3526         /* limit actual bulk transfer to bulk_timeout seconds */
3527         deadline = start + bulk_timeout;
3528         if (deadline > req->rq_deadline)
3529                 deadline = req->rq_deadline;
3530
3531         do {
3532                 time64_t timeoutl = deadline - ktime_get_seconds();
3533                 time64_t rq_deadline;
3534
3535                 while (timeoutl >= 0 &&
3536                        wait_event_idle_timeout(
3537                                desc->bd_waitq,
3538                                !ptlrpc_server_bulk_active(desc) ||
3539                                exp->exp_failed ||
3540                                exp->exp_conn_cnt >
3541                                lustre_msg_get_conn_cnt(req->rq_reqmsg),
3542                                timeoutl ? cfs_time_seconds(1) : 1) == 0)
3543                         timeoutl -= 1;
3544                 rc = timeoutl < 0 ? -ETIMEDOUT : 0;
3545
3546                 /* Wait again if we changed rq_deadline. */
3547                 rq_deadline = READ_ONCE(req->rq_deadline);
3548                 deadline = start + bulk_timeout;
3549                 if (deadline > rq_deadline)
3550                         deadline = rq_deadline;
3551         } while (rc == -ETIMEDOUT &&
3552                  deadline > ktime_get_seconds());
3553
3554         if (rc == -ETIMEDOUT) {
3555                 DEBUG_REQ(D_ERROR, req, "timeout on bulk %s after %lld%+llds",
3556                           bulk2type(req), deadline - start,
3557                           ktime_get_real_seconds() - deadline);
3558                 ptlrpc_abort_bulk(desc);
3559         } else if (exp->exp_failed) {
3560                 DEBUG_REQ(D_ERROR, req, "Eviction on bulk %s",
3561                           bulk2type(req));
3562                 rc = -ENOTCONN;
3563                 ptlrpc_abort_bulk(desc);
3564         } else if (exp->exp_conn_cnt >
3565                    lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3566                 DEBUG_REQ(D_ERROR, req, "Reconnect on bulk %s",
3567                           bulk2type(req));
3568                 /* We don't reply anyway. */
3569                 rc = -ETIMEDOUT;
3570                 ptlrpc_abort_bulk(desc);
3571         } else if (desc->bd_failure) {
3572                 DEBUG_REQ(D_ERROR, req, "network error on bulk %s",
3573                           bulk2type(req));
3574                 /* XXX should this be a different errno? */
3575                 rc = -ETIMEDOUT;
3576         } else {
3577                 if (req->rq_bulk_write)
3578                         rc = sptlrpc_svc_unwrap_bulk(req, desc);
3579                 if (rc == 0 && desc->bd_nob_transferred != desc->bd_nob) {
3580                         DEBUG_REQ(D_ERROR, req, "truncated bulk %s %d(%d)",
3581                                   bulk2type(req), desc->bd_nob_transferred,
3582                                   desc->bd_nob);
3583                         /* XXX should this be a different errno? */
3584                         rc = -ETIMEDOUT;
3585                 }
3586         }
3587
3588         RETURN(rc);
3589 }
3590 EXPORT_SYMBOL(target_bulk_io);
3591
3592 #endif /* HAVE_SERVER_SUPPORT */