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 <uapi/linux/lustre/lustre_ioctl.h>
  53 #include "ldlm_internal.h"
  54
  55 /*
  56  * @priority: If non-zero, move the selected connection to the list head.
  57  * @create: If zero, only search in existing connections.
  58  */
  59 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  60                            int priority, int create)
  61 {
  62         struct ptlrpc_connection *ptlrpc_conn;
  63         struct obd_import_conn *imp_conn = NULL, *item;
  64         u32 refnet = LNET_NET_ANY;
  65         int rc = 0;
  66
  67         ENTRY;
  68
  69         if (!create && !priority) {
  70                 CDEBUG(D_HA, "Nothing to do\n");
  71                 RETURN(-EINVAL);
  72         }
  73
  74         if (imp->imp_connection &&
  75             imp->imp_connection->c_remote_uuid.uuid[0] == 0)
  76                 /* refnet is used to restrict network connections */
  77                 refnet = LNET_NID_NET(&imp->imp_connection->c_self);
  78         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, refnet);
  79         if (!ptlrpc_conn) {
  80                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  81                 RETURN(-ENOENT);
  82         }
  83
  84         if (create) {
  85                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  86                 if (!imp_conn)
  87                         GOTO(out_put, rc = -ENOMEM);
  88         }
  89
  90         spin_lock(&imp->imp_lock);
  91         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  92                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  93                         if (priority) {
  94                                 list_move(&item->oic_item,
  95                                           &imp->imp_conn_list);
  96                                 item->oic_last_attempt = 0;
  97                         }
  98                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  99                                imp, imp->imp_obd->obd_name, uuid->uuid,
 100                                (priority ? ", moved to head" : ""));
 101                         spin_unlock(&imp->imp_lock);
 102                         GOTO(out_free, rc = 0);
 103                 }
 104         }
 105         /* No existing import connection found for \a uuid. */
 106         if (create) {
 107                 imp_conn->oic_conn = ptlrpc_conn;
 108                 imp_conn->oic_uuid = *uuid;
 109                 imp_conn->oic_last_attempt = 0;
 110                 if (priority)
 111                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 112                 else
 113                         list_add_tail(&imp_conn->oic_item,
 114                                       &imp->imp_conn_list);
 115                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 116                        imp, imp->imp_obd->obd_name, uuid->uuid,
 117                        (priority ? "head" : "tail"));
 118         } else {
 119                 spin_unlock(&imp->imp_lock);
 120                 GOTO(out_free, rc = -ENOENT);
 121         }
 122
 123         spin_unlock(&imp->imp_lock);
 124         RETURN(0);
 125 out_free:
 126         if (imp_conn)
 127                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 128 out_put:
 129         ptlrpc_connection_put(ptlrpc_conn);
 130         RETURN(rc);
 131 }
 132
 133 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 134 {
 135         return import_set_conn(imp, uuid, 1, 0);
 136 }
 137
 138 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 139                            int priority)
 140 {
 141         return import_set_conn(imp, uuid, priority, 1);
 142 }
 143 EXPORT_SYMBOL(client_import_add_conn);
 144
 145 int client_import_dyn_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 146                                lnet_nid_t prim_nid, int priority)
 147 {
 148         struct ptlrpc_connection *ptlrpc_conn;
 149         int rc;
 150
 151         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, LNET_NIDNET(prim_nid));
 152         if (!ptlrpc_conn) {
 153                 const char *str_uuid = obd_uuid2str(uuid);
 154
 155                 rc = class_add_uuid(str_uuid, prim_nid);
 156                 if (rc) {
 157                         CERROR("%s: failed to add UUID '%s': rc = %d\n",
 158                                imp->imp_obd->obd_name, str_uuid, rc);
 159                         return rc;
 160                 }
 161         }
 162         return import_set_conn(imp, uuid, priority, 1);
 163 }
 164 EXPORT_SYMBOL(client_import_dyn_add_conn);
 165
 166 int client_import_add_nids_to_conn(struct obd_import *imp, lnet_nid_t *nids,
 167                                    int nid_count, struct obd_uuid *uuid)
 168 {
 169         struct obd_import_conn *conn;
 170         int rc = -ENOENT;
 171
 172         ENTRY;
 173         if (nid_count <= 0 || !nids)
 174                 return rc;
 175
 176         spin_lock(&imp->imp_lock);
 177         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 178                 if (class_check_uuid(&conn->oic_uuid, nids[0])) {
 179                         *uuid = conn->oic_uuid;
 180                         spin_unlock(&imp->imp_lock);
 181                         rc = class_add_nids_to_uuid(&conn->oic_uuid, nids,
 182                                                     nid_count);
 183                         RETURN(rc);
 184                 }
 185         }
 186         spin_unlock(&imp->imp_lock);
 187         RETURN(rc);
 188 }
 189 EXPORT_SYMBOL(client_import_add_nids_to_conn);
 190
 191 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 192 {
 193         struct obd_import_conn *imp_conn;
 194         struct obd_export *dlmexp;
 195         int rc = -ENOENT;
 196
 197         ENTRY;
 198
 199         spin_lock(&imp->imp_lock);
 200         if (list_empty(&imp->imp_conn_list)) {
 201                 LASSERT(!imp->imp_connection);
 202                 GOTO(out, rc);
 203         }
 204
 205         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 206                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 207                         continue;
 208                 LASSERT(imp_conn->oic_conn);
 209
 210                 if (imp_conn == imp->imp_conn_current) {
 211                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 212
 213                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 214                             imp->imp_state != LUSTRE_IMP_DISCON) {
 215                                 CERROR("can't remove current connection\n");
 216                                 GOTO(out, rc = -EBUSY);
 217                         }
 218
 219                         ptlrpc_connection_put(imp->imp_connection);
 220                         imp->imp_connection = NULL;
 221
 222                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 223                         if (dlmexp && dlmexp->exp_connection) {
 224                                 LASSERT(dlmexp->exp_connection ==
 225                                         imp_conn->oic_conn);
 226                                 ptlrpc_connection_put(dlmexp->exp_connection);
 227                                 dlmexp->exp_connection = NULL;
 228                         }
 229
 230                         if (dlmexp != NULL)
 231                                 class_export_put(dlmexp);
 232                 }
 233
 234                 list_del(&imp_conn->oic_item);
 235                 ptlrpc_connection_put(imp_conn->oic_conn);
 236                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 237                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 238                        imp, imp->imp_obd->obd_name, uuid->uuid);
 239                 rc = 0;
 240                 break;
 241         }
 242 out:
 243         spin_unlock(&imp->imp_lock);
 244         if (rc == -ENOENT)
 245                 CERROR("connection %s not found\n", uuid->uuid);
 246         RETURN(rc);
 247 }
 248 EXPORT_SYMBOL(client_import_del_conn);
 249
 250 /**
 251  * Find conn UUID by peer NID. \a peer is a server NID. This function is used
 252  * to find a conn uuid of \a imp which can reach \a peer.
 253  */
 254 int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
 255                             struct obd_uuid *uuid)
 256 {
 257         struct obd_import_conn *conn;
 258         int rc = -ENOENT;
 259
 260         ENTRY;
 261
 262         spin_lock(&imp->imp_lock);
 263         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 264                 /* Check if conn UUID does have this peer NID. */
 265                 if (class_check_uuid(&conn->oic_uuid, peer)) {
 266                         *uuid = conn->oic_uuid;
 267                         rc = 0;
 268                         break;
 269                 }
 270         }
 271         spin_unlock(&imp->imp_lock);
 272         RETURN(rc);
 273 }
 274 EXPORT_SYMBOL(client_import_find_conn);
 275
 276 void client_destroy_import(struct obd_import *imp)
 277 {
 278         /*
 279          * Drop security policy instance after all RPCs have finished/aborted
 280          * to let all busy contexts be released.
 281          */
 282         class_import_get(imp);
 283         class_destroy_import(imp);
 284         sptlrpc_import_sec_put(imp);
 285         class_import_put(imp);
 286 }
 287 EXPORT_SYMBOL(client_destroy_import);
 288
 289 /**
 290  * Check whether or not the OSC is on MDT.
 291  * In the config log,
 292  * osc on MDT
 293  *      setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
 294  * osc on client
 295  *      setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
 296  *
 297  **/
 298 static int osc_on_mdt(char *obdname)
 299 {
 300         char *ptr;
 301
 302         ptr = strrchr(obdname, '-');
 303         if (ptr == NULL)
 304                 return 0;
 305
 306         if (strncmp(ptr + 1, "MDT", 3) == 0)
 307                 return 1;
 308
 309         return 0;
 310 }
 311
 312 /*
 313  * Configure an RPC client OBD device.
 314  *
 315  * lcfg parameters:
 316  * 1 - client UUID
 317  * 2 - server UUID
 318  * 3 - inactive-on-startup
 319  * 4 - restrictive net
 320  */
 321 int client_obd_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 322 {
 323         struct client_obd *cli = &obd->u.cli;
 324         struct obd_import *imp;
 325         struct obd_uuid server_uuid;
 326         int rq_portal, rp_portal, connect_op;
 327         const char *name = obd->obd_type->typ_name;
 328         enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
 329         char *cli_name = lustre_cfg_buf(lcfg, 0);
 330         struct ptlrpc_connection fake_conn = { .c_self = {},
 331                                                .c_remote_uuid.uuid[0] = 0 };
 332         int rc;
 333
 334         ENTRY;
 335
 336         /*
 337          * In a more perfect world, we would hang a ptlrpc_client off of
 338          * obd_type and just use the values from there.
 339          */
 340         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 341                 rq_portal = OST_REQUEST_PORTAL;
 342                 rp_portal = OSC_REPLY_PORTAL;
 343                 connect_op = OST_CONNECT;
 344                 cli->cl_sp_me = LUSTRE_SP_CLI;
 345                 cli->cl_sp_to = LUSTRE_SP_OST;
 346                 ns_type = LDLM_NS_TYPE_OSC;
 347         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
 348                    !strcmp(name, LUSTRE_LWP_NAME)) {
 349                 rq_portal = MDS_REQUEST_PORTAL;
 350                 rp_portal = MDC_REPLY_PORTAL;
 351                 connect_op = MDS_CONNECT;
 352                 if (is_lwp_on_ost(cli_name))
 353                         cli->cl_sp_me = LUSTRE_SP_OST;
 354                 else if (is_lwp_on_mdt(cli_name))
 355                         cli->cl_sp_me = LUSTRE_SP_MDT;
 356                 else
 357                         cli->cl_sp_me = LUSTRE_SP_CLI;
 358                 cli->cl_sp_to = LUSTRE_SP_MDT;
 359                 ns_type = LDLM_NS_TYPE_MDC;
 360         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
 361                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
 362                         /* OSP_on_MDT for other MDTs */
 363                         connect_op = MDS_CONNECT;
 364                         cli->cl_sp_to = LUSTRE_SP_MDT;
 365                         ns_type = LDLM_NS_TYPE_MDC;
 366                         rq_portal = OUT_PORTAL;
 367                 } else {
 368                         /* OSP on MDT for OST */
 369                         connect_op = OST_CONNECT;
 370                         cli->cl_sp_to = LUSTRE_SP_OST;
 371                         ns_type = LDLM_NS_TYPE_OSC;
 372                         rq_portal = OST_REQUEST_PORTAL;
 373                 }
 374                 rp_portal = OSC_REPLY_PORTAL;
 375                 cli->cl_sp_me = LUSTRE_SP_MDT;
 376         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 377                 rq_portal = MGS_REQUEST_PORTAL;
 378                 rp_portal = MGC_REPLY_PORTAL;
 379                 connect_op = MGS_CONNECT;
 380                 cli->cl_sp_me = LUSTRE_SP_MGC;
 381                 cli->cl_sp_to = LUSTRE_SP_MGS;
 382                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 383                 ns_type = LDLM_NS_TYPE_MGC;
 384         } else {
 385                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 386                        name);
 387                 RETURN(-EINVAL);
 388         }
 389
 390         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 391                 CERROR("requires a TARGET UUID\n");
 392                 RETURN(-EINVAL);
 393         }
 394
 395         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 396                 CERROR("client UUID must be less than 38 characters\n");
 397                 RETURN(-EINVAL);
 398         }
 399
 400         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 401                 CERROR("setup requires a SERVER UUID\n");
 402                 RETURN(-EINVAL);
 403         }
 404
 405         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 406                 CERROR("target UUID must be less than 38 characters\n");
 407                 RETURN(-EINVAL);
 408         }
 409
 410         init_rwsem(&cli->cl_sem);
 411         mutex_init(&cli->cl_mgc_mutex);
 412         cli->cl_seq = NULL;
 413         init_rwsem(&cli->cl_seq_rwsem);
 414         cli->cl_conn_count = 0;
 415         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 416                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 417                      sizeof(server_uuid)));
 418
 419         cli->cl_dirty_pages = 0;
 420         cli->cl_dirty_max_pages = 0;
 421         cli->cl_avail_grant = 0;
 422         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
 423         /*
 424          * cl_dirty_max_pages may be changed at connect time in
 425          * ptlrpc_connect_interpret().
 426          */
 427         client_adjust_max_dirty(cli);
 428         init_waitqueue_head(&cli->cl_cache_waiters);
 429         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 430         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 431         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 432         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 433         spin_lock_init(&cli->cl_loi_list_lock);
 434         atomic_set(&cli->cl_pending_w_pages, 0);
 435         atomic_set(&cli->cl_pending_r_pages, 0);
 436         cli->cl_r_in_flight = 0;
 437         cli->cl_w_in_flight = 0;
 438
 439         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 440         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 441         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 442         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 443         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 444         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 445
 446         /* lru for osc. */
 447         INIT_LIST_HEAD(&cli->cl_lru_osc);
 448         atomic_set(&cli->cl_lru_shrinkers, 0);
 449         atomic_long_set(&cli->cl_lru_busy, 0);
 450         atomic_long_set(&cli->cl_lru_in_list, 0);
 451         INIT_LIST_HEAD(&cli->cl_lru_list);
 452         spin_lock_init(&cli->cl_lru_list_lock);
 453         atomic_long_set(&cli->cl_unstable_count, 0);
 454         INIT_LIST_HEAD(&cli->cl_shrink_list);
 455         INIT_LIST_HEAD(&cli->cl_grant_chain);
 456
 457         INIT_LIST_HEAD(&cli->cl_flight_waiters);
 458         cli->cl_rpcs_in_flight = 0;
 459
 460         init_waitqueue_head(&cli->cl_destroy_waitq);
 461         atomic_set(&cli->cl_destroy_in_flight, 0);
 462
 463
 464         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 465         cli->cl_preferred_cksum_type = 0;
 466 #ifdef ENABLE_CHECKSUM
 467         /* Turn on checksumming by default. */
 468         cli->cl_checksum = 1;
 469         /*
 470          * The supported checksum types will be worked out at connect time
 471          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 472          * through procfs.
 473          */
 474         cli->cl_cksum_type = cli->cl_supp_cksum_types;
 475 #endif
 476         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 477
 478         /*
 479          * Set it to possible maximum size. It may be reduced by ocd_brw_size
 480          * from OFD after connecting.
 481          */
 482         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 483
 484         cli->cl_max_short_io_bytes = OBD_DEF_SHORT_IO_BYTES;
 485
 486         /*
 487          * set cl_chunkbits default value to PAGE_SHIFT,
 488          * it will be updated at OSC connection time.
 489          */
 490         cli->cl_chunkbits = PAGE_SHIFT;
 491
 492         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 493                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 494         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
 495                 cli->cl_max_rpcs_in_flight = 2;
 496         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
 497                 cli->cl_max_rpcs_in_flight = 3;
 498         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
 499                 cli->cl_max_rpcs_in_flight = 4;
 500         } else {
 501                 if (osc_on_mdt(obd->obd_name))
 502                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
 503                 else
 504                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 505         }
 506
 507         spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
 508         cli->cl_max_mod_rpcs_in_flight = 0;
 509         cli->cl_mod_rpcs_in_flight = 0;
 510         cli->cl_close_rpcs_in_flight = 0;
 511         init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
 512         cli->cl_mod_rpcs_init = ktime_get_real();
 513         cli->cl_mod_tag_bitmap = NULL;
 514
 515         INIT_LIST_HEAD(&cli->cl_chg_dev_linkage);
 516
 517         if (connect_op == MDS_CONNECT) {
 518                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
 519                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
 520                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 521                 if (cli->cl_mod_tag_bitmap == NULL)
 522                         GOTO(err, rc = -ENOMEM);
 523         }
 524
 525         rc = ldlm_get_ref();
 526         if (rc) {
 527                 CERROR("ldlm_get_ref failed: %d\n", rc);
 528                 GOTO(err, rc);
 529         }
 530
 531         ptlrpc_init_client(rq_portal, rp_portal, name,
 532                            &obd->obd_ldlm_client);
 533
 534         imp = class_new_import(obd);
 535         if (imp == NULL)
 536                 GOTO(err_ldlm, rc = -ENOENT);
 537         imp->imp_client = &obd->obd_ldlm_client;
 538         imp->imp_connect_op = connect_op;
 539         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 540                LUSTRE_CFG_BUFLEN(lcfg, 1));
 541         class_import_put(imp);
 542
 543         if (lustre_cfg_buf(lcfg, 4)) {
 544                 __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
 545
 546                 if (refnet == LNET_NET_ANY) {
 547                         rc = -EINVAL;
 548                         CERROR("%s: bad mount option 'network=%s': rc = %d\n",
 549                                obd->obd_name, lustre_cfg_string(lcfg, 4),
 550                                rc);
 551                         GOTO(err_import, rc);
 552                 }
 553                 lnet_nid4_to_nid(LNET_MKNID(refnet, 0), &fake_conn.c_self);
 554                 imp->imp_connection = &fake_conn;
 555         }
 556
 557         rc = client_import_add_conn(imp, &server_uuid, 1);
 558         if (rc) {
 559                 CERROR("can't add initial connection\n");
 560                 GOTO(err_import, rc);
 561         }
 562         imp->imp_connection = NULL;
 563
 564         cli->cl_import = imp;
 565         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
 566         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 567
 568         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 569                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 570                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 571                                name, obd->obd_name,
 572                                cli->cl_target_uuid.uuid);
 573                         spin_lock(&imp->imp_lock);
 574                         imp->imp_deactive = 1;
 575                         spin_unlock(&imp->imp_lock);
 576                 }
 577         }
 578
 579         obd->obd_namespace = ldlm_namespace_new(obd, obd->obd_name,
 580                                                 LDLM_NAMESPACE_CLIENT,
 581                                                 LDLM_NAMESPACE_GREEDY,
 582                                                 ns_type);
 583         if (IS_ERR(obd->obd_namespace)) {
 584                 rc = PTR_ERR(obd->obd_namespace);
 585                 CERROR("%s: unable to create client namespace: rc = %d\n",
 586                        obd->obd_name, rc);
 587                 obd->obd_namespace = NULL;
 588                 GOTO(err_import, rc);
 589         }
 590
 591         RETURN(rc);
 592
 593 err_import:
 594         class_destroy_import(imp);
 595 err_ldlm:
 596         ldlm_put_ref();
 597 err:
 598         if (cli->cl_mod_tag_bitmap != NULL)
 599                 OBD_FREE(cli->cl_mod_tag_bitmap,
 600                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 601         cli->cl_mod_tag_bitmap = NULL;
 602
 603         RETURN(rc);
 604 }
 605 EXPORT_SYMBOL(client_obd_setup);
 606
 607 int client_obd_cleanup(struct obd_device *obd)
 608 {
 609         struct client_obd *cli = &obd->u.cli;
 610
 611         ENTRY;
 612
 613         ldlm_namespace_free_post(obd->obd_namespace);
 614         obd->obd_namespace = NULL;
 615
 616         obd_cleanup_client_import(obd);
 617         LASSERT(obd->u.cli.cl_import == NULL);
 618
 619         ldlm_put_ref();
 620
 621         if (cli->cl_mod_tag_bitmap != NULL)
 622                 OBD_FREE(cli->cl_mod_tag_bitmap,
 623                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 624         cli->cl_mod_tag_bitmap = NULL;
 625
 626         RETURN(0);
 627 }
 628 EXPORT_SYMBOL(client_obd_cleanup);
 629
 630 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 631 int client_connect_import(const struct lu_env *env,
 632                           struct obd_export **exp,
 633                           struct obd_device *obd, struct obd_uuid *cluuid,
 634                           struct obd_connect_data *data, void *localdata)
 635 {
 636         struct client_obd *cli = &obd->u.cli;
 637         struct obd_import *imp = cli->cl_import;
 638         struct obd_connect_data *ocd;
 639         struct lustre_handle conn = { 0 };
 640         int rc;
 641
 642         ENTRY;
 643
 644         *exp = NULL;
 645         down_write(&cli->cl_sem);
 646         if (cli->cl_conn_count > 0)
 647                 GOTO(out_sem, rc = -EALREADY);
 648
 649         rc = class_connect(&conn, obd, cluuid);
 650         if (rc)
 651                 GOTO(out_sem, rc);
 652
 653         cli->cl_conn_count++;
 654         *exp = class_conn2export(&conn);
 655
 656         LASSERT(obd->obd_namespace);
 657
 658         spin_lock(&imp->imp_lock);
 659         if (imp->imp_state == LUSTRE_IMP_CLOSED && imp->imp_deactive) {
 660                 /* need to reactivate import if trying to connect
 661                  * to a previously disconnected
 662                  */
 663                 imp->imp_deactive = 0;
 664                 imp->imp_invalid = 0;
 665         }
 666         spin_unlock(&imp->imp_lock);
 667
 668         imp->imp_dlm_handle = conn;
 669         rc = ptlrpc_init_import(imp);
 670         if (rc != 0)
 671                 GOTO(out_ldlm, rc);
 672
 673         ocd = &imp->imp_connect_data;
 674         if (data) {
 675                 *ocd = *data;
 676                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 677                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
 678         }
 679
 680         rc = ptlrpc_connect_import(imp);
 681         if (rc != 0) {
 682                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 683                 GOTO(out_ldlm, rc);
 684         }
 685         LASSERT(*exp != NULL && (*exp)->exp_connection);
 686
 687         if (data) {
 688                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 689                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 690                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 691                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 692                 data->ocd_connect_flags2 = ocd->ocd_connect_flags2;
 693         }
 694
 695         ptlrpc_pinger_add_import(imp);
 696
 697         EXIT;
 698
 699         if (rc) {
 700 out_ldlm:
 701                 cli->cl_conn_count--;
 702                 class_disconnect(*exp);
 703                 *exp = NULL;
 704         }
 705 out_sem:
 706         up_write(&cli->cl_sem);
 707
 708         if (!rc && localdata && !cli->cl_cache) {
 709                 cli->cl_cache = (struct cl_client_cache *)localdata;
 710                 cl_cache_incref(cli->cl_cache);
 711                 cli->cl_lru_left = &cli->cl_cache->ccc_lru_left;
 712
 713                 /* add this osc into entity list */
 714                 LASSERT(list_empty(&cli->cl_lru_osc));
 715                 spin_lock(&cli->cl_cache->ccc_lru_lock);
 716                 list_add(&cli->cl_lru_osc, &cli->cl_cache->ccc_lru);
 717                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
 718         }
 719
 720         return rc;
 721 }
 722 EXPORT_SYMBOL(client_connect_import);
 723
 724 int client_disconnect_export(struct obd_export *exp)
 725 {
 726         struct obd_device *obd = class_exp2obd(exp);
 727         struct client_obd *cli;
 728         struct obd_import *imp;
 729         int rc = 0, err;
 730
 731         ENTRY;
 732
 733         if (!obd) {
 734                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 735                        exp, exp ? exp->exp_handle.h_cookie : -1);
 736                 RETURN(-EINVAL);
 737         }
 738
 739         cli = &obd->u.cli;
 740         imp = cli->cl_import;
 741
 742         down_write(&cli->cl_sem);
 743         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
 744                 cli->cl_conn_count);
 745
 746         if (cli->cl_conn_count == 0) {
 747                 CERROR("disconnecting disconnected device (%s)\n",
 748                        obd->obd_name);
 749                 GOTO(out_disconnect, rc = -EINVAL);
 750         }
 751
 752         cli->cl_conn_count--;
 753         if (cli->cl_conn_count != 0)
 754                 GOTO(out_disconnect, rc = 0);
 755
 756         /*
 757          * Mark import deactivated now, so we don't try to reconnect if any
 758          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 759          * fully deactivate the import, or that would drop all requests.
 760          */
 761         spin_lock(&imp->imp_lock);
 762         imp->imp_deactive = 1;
 763         spin_unlock(&imp->imp_lock);
 764
 765         /*
 766          * Some non-replayable imports (MDS's OSCs) are pinged, so just
 767          * delete it regardless.  (It's safe to delete an import that was
 768          * never added.)
 769          */
 770         (void)ptlrpc_pinger_del_import(imp);
 771
 772         if (obd->obd_namespace != NULL) {
 773                 /* obd_force == local only */
 774                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 775                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 776                 ldlm_namespace_free_prior(obd->obd_namespace, imp,
 777                                           obd->obd_force);
 778         }
 779
 780         /*
 781          * There's no need to hold sem while disconnecting an import,
 782          * and it may actually cause deadlock in GSS.
 783          */
 784         up_write(&cli->cl_sem);
 785         rc = ptlrpc_disconnect_import(imp, 0);
 786         down_write(&cli->cl_sem);
 787
 788         ptlrpc_invalidate_import(imp);
 789
 790         EXIT;
 791
 792 out_disconnect:
 793         /*
 794          * Use server style - class_disconnect should be always called for
 795          * o_disconnect.
 796          */
 797         err = class_disconnect(exp);
 798         if (!rc && err)
 799                 rc = err;
 800
 801         up_write(&cli->cl_sem);
 802
 803         RETURN(rc);
 804 }
 805 EXPORT_SYMBOL(client_disconnect_export);
 806
 807 #ifdef HAVE_SERVER_SUPPORT
 808 int server_disconnect_export(struct obd_export *exp)
 809 {
 810         int rc;
 811
 812         ENTRY;
 813
 814         /* Disconnect early so that clients can't keep using export. */
 815         rc = class_disconnect(exp);
 816         /* Close import to avoid sending any requests. */
 817         if (exp->exp_imp_reverse)
 818                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 819
 820         ldlm_bl_thread_wakeup();
 821
 822         /* complete all outstanding replies */
 823         spin_lock(&exp->exp_lock);
 824         while (!list_empty(&exp->exp_outstanding_replies)) {
 825                 struct ptlrpc_reply_state *rs =
 826                         list_entry(exp->exp_outstanding_replies.next,
 827                                        struct ptlrpc_reply_state, rs_exp_list);
 828                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 829
 830                 spin_lock(&svcpt->scp_rep_lock);
 831
 832                 list_del_init(&rs->rs_exp_list);
 833
 834                 spin_lock(&rs->rs_lock);
 835                 /* clear rs_convert_lock to make sure rs is handled and put */
 836                 rs->rs_convert_lock = 0;
 837                 ptlrpc_schedule_difficult_reply(rs);
 838                 spin_unlock(&rs->rs_lock);
 839
 840                 spin_unlock(&svcpt->scp_rep_lock);
 841         }
 842         spin_unlock(&exp->exp_lock);
 843
 844         RETURN(rc);
 845 }
 846 EXPORT_SYMBOL(server_disconnect_export);
 847
 848 static inline int target_check_recovery_timer(struct obd_device *target)
 849 {
 850         ktime_t remaining;
 851         s64 timeout;
 852
 853         if (!target->obd_recovering || target->obd_recovery_start == 0)
 854                 return 0;
 855
 856         remaining = hrtimer_get_remaining(&target->obd_recovery_timer);
 857         timeout = ktime_divns(remaining, NSEC_PER_SEC);
 858         if (timeout > -30)
 859                 return 0;
 860
 861         /* the recovery timer should expire, but it isn't triggered,
 862          * it's better to abort the recovery of this target to speed up
 863          * the recovery of the whole cluster. */
 864         spin_lock(&target->obd_dev_lock);
 865         if (target->obd_recovering) {
 866                 CERROR("%s: Aborting recovery\n", target->obd_name);
 867                 target->obd_abort_recovery = 1;
 868                 wake_up(&target->obd_next_transno_waitq);
 869         }
 870         spin_unlock(&target->obd_dev_lock);
 871         return 0;
 872 }
 873
 874 /*
 875  * --------------------------------------------------------------------------
 876  * from old lib/target.c
 877  * --------------------------------------------------------------------------
 878  */
 879 static int target_handle_reconnect(struct lustre_handle *conn,
 880                                    struct obd_export *exp,
 881                                    struct obd_uuid *cluuid)
 882 {
 883         struct obd_device *target;
 884         struct lustre_handle *hdl;
 885         ktime_t remaining;
 886         s64 timeout;
 887         int rc = 0;
 888
 889         ENTRY;
 890         hdl = &exp->exp_imp_reverse->imp_remote_handle;
 891         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
 892                 conn->cookie = exp->exp_handle.h_cookie;
 893                 CDEBUG(D_HA,
 894                        "connect export for UUID '%s' at %p, cookie %#llx\n",
 895                        cluuid->uuid, exp, conn->cookie);
 896                 RETURN(0);
 897         }
 898
 899         target = exp->exp_obd;
 900
 901         /* Might be a re-connect after a partition. */
 902         if (memcmp(&conn->cookie, &hdl->cookie, sizeof(conn->cookie))) {
 903                 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",
 904                               target->obd_name,
 905                               obd_uuid2str(&exp->exp_client_uuid),
 906                               obd_export_nid2str(exp),
 907                               hdl->cookie, conn->cookie);
 908                 memset(conn, 0, sizeof(*conn));
 909                 /*
 910                  * target_handle_connect() treats EALREADY and
 911                  * -EALREADY differently.  -EALREADY is an error
 912                  * (same UUID, different handle).
 913                  */
 914                 RETURN(-EALREADY);
 915         }
 916
 917         if (!target->obd_recovering) {
 918                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
 919                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
 920                         obd_export_nid2str(exp));
 921                 GOTO(out_already, rc);
 922         }
 923
 924         remaining = hrtimer_get_remaining(&target->obd_recovery_timer);
 925         timeout = ktime_divns(remaining, NSEC_PER_SEC);
 926         if (timeout > 0) {
 927                 LCONSOLE_WARN("%s: Client %s (at %s) reconnected, waiting for %d clients in recovery for %lld:%.02lld\n",
 928                               target->obd_name,
 929                               obd_uuid2str(&exp->exp_client_uuid),
 930                               obd_export_nid2str(exp),
 931                               atomic_read(&target->obd_max_recoverable_clients),
 932                               timeout / 60, timeout % 60);
 933         } else {
 934                 struct target_distribute_txn_data *tdtd;
 935                 int size = 0;
 936                 int count = 0;
 937                 char *buf = NULL;
 938
 939                 target_check_recovery_timer(target);
 940
 941                 tdtd = class_exp2tgt(exp)->lut_tdtd;
 942                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
 943                         buf = tdtd->tdtd_show_update_logs_retrievers(
 944                                 tdtd->tdtd_show_retrievers_cbdata,
 945                                 &size, &count);
 946
 947                 if (count > 0)
 948                         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",
 949                                       target->obd_name,
 950                                       obd_uuid2str(&exp->exp_client_uuid),
 951                                       obd_export_nid2str(exp), count,
 952                                       buf ? buf : "unknown (not enough RAM)",
 953                                       (abs(timeout) + target->obd_recovery_timeout) / 60,
 954                                       (abs(timeout) + target->obd_recovery_timeout) % 60,
 955                                       target->obd_name);
 956                 else
 957                         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",
 958                                       target->obd_name, abs(timeout) / 60,
 959                                       abs(timeout) % 60, target->obd_name);
 960
 961                 if (buf != NULL)
 962                         OBD_FREE(buf, size);
 963         }
 964
 965 out_already:
 966         conn->cookie = exp->exp_handle.h_cookie;
 967         /*
 968          * target_handle_connect() treats EALREADY and
 969          * -EALREADY differently.  EALREADY means we are
 970          * doing a valid reconnect from the same client.
 971          */
 972         RETURN(EALREADY);
 973 }
 974
 975 static void
 976 check_and_start_recovery_timer(struct obd_device *obd,
 977                                struct ptlrpc_request *req, int new_client);
 978
 979 /**
 980  * update flags for import during reconnect process
 981  */
 982 static int rev_import_flags_update(struct obd_import *revimp,
 983                                    struct ptlrpc_request *req)
 984 {
 985         int rc;
 986         struct obd_connect_data *data;
 987
 988         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 989
 990         if (data->ocd_connect_flags & OBD_CONNECT_AT)
 991                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 992         else
 993                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 994
 995         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
 996
 997         revimp->imp_connect_data = *data;
 998         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
 999         if (rc) {
1000                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
1001                         revimp->imp_client->cli_name,
1002                         libcfs_idstr(&req->rq_peer), rc);
1003                 return rc;
1004         }
1005
1006         return 0;
1007 }
1008
1009 /**
1010  * Allocate a new reverse import for an export.
1011  *
1012  * \retval -errno in case error hit
1013  * \retval 0 if reverse import correctly init
1014  **/
1015 int rev_import_init(struct obd_export *export)
1016 {
1017         struct obd_device *obd = export->exp_obd;
1018         struct obd_import *revimp;
1019
1020         LASSERT(export->exp_imp_reverse == NULL);
1021
1022         revimp = class_new_import(obd);
1023         if (revimp == NULL)
1024                 return -ENOMEM;
1025
1026         revimp->imp_remote_handle.cookie = 0ULL;
1027         revimp->imp_client = &obd->obd_ldlm_client;
1028         revimp->imp_dlm_fake = 1;
1029
1030         /* it is safe to connect import in new state as no sends possible */
1031         spin_lock(&export->exp_lock);
1032         export->exp_imp_reverse = revimp;
1033         spin_unlock(&export->exp_lock);
1034         class_import_put(revimp);
1035
1036         return 0;
1037 }
1038 EXPORT_SYMBOL(rev_import_init);
1039
1040 /**
1041  * Handle reconnect for an export.
1042  *
1043  * \param exp export to handle reconnect process
1044  * \param req client reconnect request
1045  *
1046  * \retval -rc in case securitfy flavor can't be changed
1047  * \retval 0 in case none problems
1048  */
1049 static int rev_import_reconnect(struct obd_export *exp,
1050                                 struct ptlrpc_request *req)
1051 {
1052         struct obd_import *revimp = exp->exp_imp_reverse;
1053         struct lustre_handle *lh;
1054         int rc;
1055
1056         /* avoid sending a request until import flags are changed */
1057         ptlrpc_import_enter_resend(revimp);
1058
1059         ptlrpc_connection_put(revimp->imp_connection);
1060
1061         /*
1062          * client from recovery don't have a handle so we need to take from
1063          * request. it may produce situation when wrong client connected
1064          * to recovery as we trust a client uuid
1065          */
1066         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1067         revimp->imp_remote_handle = *lh;
1068
1069         /*
1070          * unknown versions will be caught in
1071          * ptlrpc_handle_server_req_in->lustre_unpack_msg()
1072          */
1073         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1074
1075         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
1076
1077         rc = rev_import_flags_update(revimp, req);
1078         if (rc != 0) {
1079                 /*
1080                  * it is safe to still be in RECOVERY phase as we are not able
1081                  * to setup correct security flavor so requests are not able to
1082                  * be delivered correctly
1083                  */
1084                 return rc;
1085         }
1086
1087         /* resend all rpc's via new connection */
1088         return ptlrpc_import_recovery_state_machine(revimp);
1089 }
1090
1091 int target_handle_connect(struct ptlrpc_request *req)
1092 {
1093         struct obd_device *target = NULL;
1094         struct obd_export *export = NULL;
1095         /*
1096          * connect handle - filled from target_handle_reconnect in
1097          * reconnect case
1098          */
1099         struct lustre_handle conn;
1100         struct lustre_handle *tmp;
1101         struct obd_uuid cluuid;
1102         char *str;
1103         int rc = 0;
1104         char *target_start;
1105         int target_len;
1106         bool mds_conn = false, lw_client = false, initial_conn = false;
1107         bool mds_mds_conn = false;
1108         bool new_mds_mds_conn = false;
1109         struct obd_connect_data *data, *tmpdata;
1110         int size, tmpsize;
1111         lnet_nid_t client_nid;
1112 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1113         int tmp_exp_old_falloc;
1114 #endif
1115         struct ptlrpc_connection *pcon = NULL;
1116
1117         ENTRY;
1118
1119         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
1120
1121         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
1122         if (str == NULL) {
1123                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
1124                 GOTO(out, rc = -EINVAL);
1125         }
1126
1127         target = class_dev_by_str(str);
1128         if (!target) {
1129                 deuuidify(str, NULL, &target_start, &target_len);
1130                 LCONSOLE_ERROR_MSG(0x137,
1131                                    "%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",
1132                                    str, libcfs_nidstr(&req->rq_peer.nid));
1133                 GOTO(out, rc = -ENODEV);
1134         }
1135
1136         spin_lock(&target->obd_dev_lock);
1137
1138         target->obd_conn_inprogress++;
1139
1140         if (target->obd_stopping || !target->obd_set_up) {
1141                 spin_unlock(&target->obd_dev_lock);
1142
1143                 deuuidify(str, NULL, &target_start, &target_len);
1144                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
1145                               target_len, target_start,
1146                               libcfs_nidstr(&req->rq_peer.nid),
1147                               (target->obd_stopping ?
1148                                "stopping" : "not set up"));
1149                 GOTO(out, rc = -ENODEV);
1150         }
1151
1152         if (target->obd_no_conn) {
1153                 spin_unlock(&target->obd_dev_lock);
1154
1155                 CDEBUG(D_INFO,
1156                        "%s: Temporarily refusing client connection from %s\n",
1157                        target->obd_name, libcfs_nidstr(&req->rq_peer.nid));
1158                 GOTO(out, rc = -EAGAIN);
1159         }
1160
1161         spin_unlock(&target->obd_dev_lock);
1162
1163         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1164         if (str == NULL) {
1165                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1166                 GOTO(out, rc = -EINVAL);
1167         }
1168
1169         obd_str2uuid(&cluuid, str);
1170
1171         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1172         if (tmp == NULL)
1173                 GOTO(out, rc = -EPROTO);
1174
1175         conn = *tmp;
1176
1177         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1178                                     RCL_CLIENT);
1179         if (size < 0 || size > 8 * sizeof(struct obd_connect_data))
1180                 GOTO(out, rc = -EPROTO);
1181         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1182         if (!data)
1183                 GOTO(out, rc = -EPROTO);
1184
1185         rc = req_capsule_server_pack(&req->rq_pill);
1186         if (rc)
1187                 GOTO(out, rc);
1188
1189 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1190         /*
1191          * Don't allow clients to connect that are using old 1.8 format
1192          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1193          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1194          * FULL20 flag should be set on all connections since 2.0, but no
1195          * longer affects behaviour.
1196          *
1197          * Later this check will be disabled and the flag can be retired
1198          * completely once interop with 3.0 is no longer needed.
1199          */
1200         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1201                 GOTO(out, rc = -EPROTO);
1202
1203         /* Old clients will have 'tmp_exp_old_falloc' as 1.
1204          * Newer clients (2.15) and beyond will have it set as 0
1205          */
1206         tmp_exp_old_falloc =
1207                 !!(data->ocd_connect_flags & OBD_CONNECT_OLD_FALLOC);
1208
1209         CDEBUG(D_INFO, "%s: ocd_connect_flags: %#llx tmp_exp_old_falloc: %d\n",
1210                target->obd_name, data->ocd_connect_flags, tmp_exp_old_falloc);
1211
1212         /*
1213          * Don't allow liblustre clients to connect.
1214          * - testing was disabled in v2_2_50_0-61-g6a75d65
1215          * - building was disabled in v2_5_58_0-28-g7277179
1216          * - client code was deleted in v2_6_50_0-101-gcdfbc72,
1217          * - clients were refused connect for version difference > 0.0.1.32
1218          */
1219         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1220                 DEBUG_REQ(D_WARNING, req, "Refusing libclient connection");
1221                 GOTO(out, rc = -EPROTO);
1222         }
1223 #endif
1224
1225         /*
1226          * Note: lw_client is needed in MDS-MDS failover during update log
1227          * processing, so we needs to allow lw_client to be connected at
1228          * anytime, instead of only the initial connection
1229          */
1230         lw_client = OCD_HAS_FLAG(data, LIGHTWEIGHT);
1231
1232         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1233                 initial_conn = true;
1234                 mds_conn = OCD_HAS_FLAG(data, MDS);
1235                 mds_mds_conn = OCD_HAS_FLAG(data, MDS_MDS);
1236
1237                 /*
1238                  * OBD_CONNECT_MNE_SWAB is removed at 2.14
1239                  * Checking OBD_CONNECT_FID can be removed in the future.
1240                  *
1241                  * Via check OBD_CONNECT_FID, we can distinguish whether
1242                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1243                  * MGC or MDT, since MGC does not use OBD_CONNECT_FID.
1244                  */
1245                 if (!lw_client &&
1246                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1247                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1248                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1249                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1250                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1251                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1252
1253                         /*
1254                          * We do not support the MDT-MDT interoperations with
1255                          * different version MDT because of protocol changes.
1256                          */
1257                         if (unlikely(major != LUSTRE_MAJOR ||
1258                                      minor != LUSTRE_MINOR ||
1259                                      abs(patch - LUSTRE_PATCH) > 3)) {
1260                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the connection from different version MDT (%d.%d.%d.%d) %s %s\n",
1261                                               target->obd_name, LUSTRE_MAJOR,
1262                                               LUSTRE_MINOR, LUSTRE_PATCH,
1263                                               LUSTRE_FIX, major, minor, patch,
1264                                               OBD_OCD_VERSION_FIX(data->ocd_version),
1265                                               libcfs_nidstr(&req->rq_peer.nid),
1266                                               str);
1267                                 GOTO(out, rc = -EPROTO);
1268                         }
1269                 }
1270         }
1271
1272         /* lctl gets a backstage, all-access pass. */
1273         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1274                 goto dont_check_exports;
1275
1276         export = obd_uuid_lookup(target, &cluuid);
1277         if (!export)
1278                 goto no_export;
1279
1280         /* We've found an export in the hash. */
1281
1282         spin_lock(&export->exp_lock);
1283
1284         if (export->exp_connecting) { /* b=9635, et. al. */
1285                 spin_unlock(&export->exp_lock);
1286                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1287                               export->exp_obd->obd_name, export,
1288                               libcfs_nidstr(&req->rq_peer.nid));
1289                 class_export_put(export);
1290                 export = NULL;
1291                 rc = -EALREADY;
1292         } else if ((mds_conn || (lw_client && initial_conn) ||
1293                    OCD_HAS_FLAG(data, MDS_MDS)) && export->exp_connection) {
1294                 spin_unlock(&export->exp_lock);
1295                 if (!nid_same(&req->rq_peer.nid,
1296                               &export->exp_connection->c_peer.nid)) {
1297                         /* MDS or LWP reconnected after failover. */
1298                         LCONSOLE_WARN("%s: Received %s connection from %s, removing former export from %s\n",
1299                                       target->obd_name,
1300                                       lw_client ? "LWP" : "MDS",
1301                                       libcfs_nidstr(&req->rq_peer.nid),
1302                                       libcfs_nidstr(&export->exp_connection->c_peer.nid));
1303                 } else {
1304                         /* New connection from the same NID. */
1305                         LCONSOLE_WARN("%s: Received new %s connection from %s, %s former export from same NID\n",
1306                                       target->obd_name,
1307                                       lw_client ? "LWP" : "MDS",
1308                                       libcfs_nidstr(&req->rq_peer.nid),
1309                                       OCD_HAS_FLAG(data, MDS_MDS) ?
1310                                       "keep" : "remove");
1311                 }
1312
1313                 if (nid_same(&req->rq_peer.nid,
1314                              &export->exp_connection->c_peer.nid) &&
1315                     OCD_HAS_FLAG(data, MDS_MDS)) {
1316                         /*
1317                          * Because exports between MDTs will always be
1318                          * kept, let's do not fail such export if they
1319                          * come from the same NID, otherwise it might
1320                          * cause eviction between MDTs, which might
1321                          * cause namespace inconsistency
1322                          */
1323                         spin_lock(&export->exp_lock);
1324                         export->exp_connecting = 1;
1325                         export->exp_conn_cnt = 0;
1326                         spin_unlock(&export->exp_lock);
1327                         conn.cookie = export->exp_handle.h_cookie;
1328                         rc = EALREADY;
1329                 } else {
1330                         class_fail_export(export);
1331                         class_export_put(export);
1332                         export = NULL;
1333                         rc = 0;
1334                 }
1335         } else if (export->exp_connection != NULL && initial_conn &&
1336                    !nid_same(&req->rq_peer.nid,
1337                              &export->exp_connection->c_peer.nid)) {
1338                 spin_unlock(&export->exp_lock);
1339                 /* In MDS failover we have static UUID but NID can change. */
1340                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when existing nid %s is already connected\n",
1341                               target->obd_name, cluuid.uuid,
1342                               libcfs_nidstr(&req->rq_peer.nid),
1343                               libcfs_nidstr(
1344                                       &export->exp_connection->c_peer.nid));
1345                 rc = -EALREADY;
1346                 class_export_put(export);
1347                 export = NULL;
1348         } else if (OBD_FAIL_PRECHECK(OBD_FAIL_TGT_RECOVERY_CONNECT) &&
1349                    !lw_client) {
1350                 spin_unlock(&export->exp_lock);
1351                 rc = -EAGAIN;
1352         } else {
1353                 export->exp_connecting = 1;
1354                 spin_unlock(&export->exp_lock);
1355                 LASSERT(export->exp_obd == target);
1356
1357                 rc = target_handle_reconnect(&conn, export, &cluuid);
1358         }
1359
1360         /* If we found an export, we already unlocked. */
1361         if (!export) {
1362 no_export:
1363                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1364         } else if (req->rq_export == NULL &&
1365                    atomic_read(&export->exp_rpc_count) > 0) {
1366                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, still busy with %d references\n",
1367                               target->obd_name, cluuid.uuid,
1368                               libcfs_nidstr(&req->rq_peer.nid),
1369                               refcount_read(&export->exp_handle.h_ref));
1370                         GOTO(out, rc = -EBUSY);
1371         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
1372                    rc != EALREADY) {
1373                 if (!strstr(cluuid.uuid, "mdt"))
1374                         LCONSOLE_WARN("%s: Rejecting reconnect from the known client %s (at %s) because it is indicating it is a new client\n",
1375                                       target->obd_name, cluuid.uuid,
1376                                       libcfs_nidstr(&req->rq_peer.nid));
1377                 GOTO(out, rc = -EALREADY);
1378         } else {
1379                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1380         }
1381
1382         if (rc < 0)
1383                 GOTO(out, rc);
1384
1385         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %lld last %lld\n",
1386                target->obd_name, cluuid.uuid, libcfs_nidstr(&req->rq_peer.nid),
1387                target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1388                export, ktime_get_seconds(),
1389                export ? export->exp_last_request_time : 0);
1390
1391         /*
1392          * If this is the first time a client connects, reset the recovery
1393          * timer. Discard lightweight connections which might be local.
1394          */
1395         if (!lw_client && rc == 0 && target->obd_recovering)
1396                 check_and_start_recovery_timer(target, req, export == NULL);
1397
1398         /*
1399          * We want to handle EALREADY but *not* -EALREADY from
1400          * target_handle_reconnect(), return reconnection state in a flag.
1401          */
1402         if (rc == EALREADY) {
1403                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1404                 rc = 0;
1405         } else {
1406                 LASSERT(rc == 0);
1407         }
1408
1409         /* Tell the client if we support replayable requests. */
1410         if (target->obd_replayable)
1411                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1412         client_nid = lnet_nid_to_nid4(&req->rq_peer.nid);
1413
1414         if (export == NULL) {
1415                 /* allow lightweight connections during recovery */
1416                 /*
1417                  * allow "new" MDT to be connected during recovery, since we
1418                  * need retrieve recovery update records from it
1419                  */
1420                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1421                         struct hrtimer *timer = &target->obd_recovery_timer;
1422                         ktime_t remaining;
1423                         s64 timeout, left;
1424                         int in_progress;
1425                         int connected;
1426                         int known;
1427                         int stale;
1428                         char *msg;
1429
1430                         connected = atomic_read(&target->obd_connected_clients);
1431                         in_progress = atomic_read(&target->obd_lock_replay_clients);
1432                         known =
1433                            atomic_read(&target->obd_max_recoverable_clients);
1434                         stale = target->obd_stale_clients;
1435                         remaining = hrtimer_get_remaining(timer);
1436                         left = ktime_divns(remaining, NSEC_PER_SEC);
1437
1438                         if (ktime_to_ns(remaining) > 0) {
1439                                 msg = "to recover in";
1440                                 timeout = left;
1441                         } else {
1442                                 msg = "already passed deadline";
1443                                 timeout = -left;
1444
1445                                 target_check_recovery_timer(target);
1446                         }
1447
1448                         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",
1449                                       target->obd_name, cluuid.uuid,
1450                                       libcfs_nidstr(&req->rq_peer.nid), known,
1451                                       connected - in_progress, in_progress,
1452                                       stale, msg, timeout / 60, timeout % 60);
1453                         rc = -EBUSY;
1454                 } else {
1455 dont_check_exports:
1456                         rc = obd_connect(req->rq_svc_thread->t_env,
1457                                          &export, target, &cluuid, data,
1458                                          &client_nid);
1459                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1460                                 lustre_msg_add_op_flags(req->rq_repmsg,
1461                                                         MSG_CONNECT_RECOVERING);
1462                         if (rc == 0) {
1463                                 conn.cookie = export->exp_handle.h_cookie;
1464                                 rc = rev_import_init(export);
1465                         }
1466
1467                         if (mds_mds_conn)
1468                                 new_mds_mds_conn = true;
1469                 }
1470         } else {
1471                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1472                                    export, target, &cluuid, data, &client_nid);
1473         }
1474         if (rc)
1475                 GOTO(out, rc);
1476
1477         data->ocd_instance = obd2obt(target)->obt_instance;
1478
1479         /*
1480          * Return only the parts of obd_connect_data that we understand, so the
1481          * client knows that we don't understand the rest.
1482          */
1483         if (data) {
1484                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1485                                                RCL_SERVER);
1486                 tmpdata = req_capsule_server_get(&req->rq_pill,
1487                                                  &RMF_CONNECT_DATA);
1488                 /*
1489                  * Don't use struct assignment here, because the client reply
1490                  * buffer may be smaller/larger than the local struct
1491                  * obd_connect_data.
1492                  */
1493                 memcpy(tmpdata, data, min(tmpsize, size));
1494         }
1495
1496         /*
1497          * If the client and the server are the same node, we will already
1498          * have an export that really points to the client's DLM export,
1499          * because we have a shared handles table.
1500          *
1501          * XXX this will go away when shaver stops sending the "connect" handle
1502          * in the real "remote handle" field of the request --phik 24 Apr 2003
1503          */
1504         ptlrpc_request_change_export(req, export);
1505
1506         pcon = ptlrpc_connection_get(&req->rq_peer,
1507                                      &req->rq_self, &cluuid);
1508         if (pcon == NULL)
1509                 GOTO(out, rc = -ENOTCONN);
1510
1511         spin_lock(&export->exp_lock);
1512
1513         if (export->exp_disconnected) {
1514                 spin_unlock(&export->exp_lock);
1515                 GOTO(out, rc = -ENODEV);
1516         }
1517         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1518                 spin_unlock(&export->exp_lock);
1519                 CDEBUG(D_RPCTRACE,
1520                        "%s: %s already connected at greater or equal conn_cnt: %d >= %d\n",
1521                        cluuid.uuid, libcfs_nidstr(&req->rq_peer.nid),
1522                        export->exp_conn_cnt,
1523                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1524
1525                 GOTO(out, rc = -EALREADY);
1526         }
1527         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1528         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1529
1530 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1531         /* make 'tmp_exp_old_falloc' persistent by saving it into
1532          * server side export object(obd_export)
1533          */
1534         export->exp_old_falloc = tmp_exp_old_falloc;
1535 #endif
1536
1537         /* Check to see if connection came from another NID. */
1538         if (export->exp_connection != NULL &&
1539             !nid_same(&export->exp_connection->c_peer.nid,
1540                       &req->rq_peer.nid)) {
1541                 obd_nid_del(export->exp_obd, export);
1542                 ptlrpc_connection_put(export->exp_connection);
1543                 export->exp_connection = NULL;
1544         }
1545
1546         if (export->exp_connection == NULL) {
1547                 export->exp_connection = pcon;
1548                 pcon = NULL;
1549         }
1550         obd_nid_add(export->exp_obd, export);
1551
1552         spin_unlock(&export->exp_lock);
1553
1554         lustre_msg_set_handle(req->rq_repmsg, &conn);
1555
1556         rc = rev_import_reconnect(export, req);
1557         if (rc != 0)
1558                 GOTO(out, rc);
1559
1560         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1561                 int has_transno;
1562                 __u64 transno = data->ocd_transno;
1563
1564                 spin_lock(&export->exp_lock);
1565                 /*
1566                  * possible race with class_disconnect_stale_exports,
1567                  * export may be already in the eviction process
1568                  */
1569                 if (export->exp_failed) {
1570                         spin_unlock(&export->exp_lock);
1571                         GOTO(out, rc = -ENODEV);
1572                 }
1573                 export->exp_in_recovery = 1;
1574                 export->exp_req_replay_needed = 1;
1575                 export->exp_lock_replay_needed = 1;
1576                 spin_unlock(&export->exp_lock);
1577
1578                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1579                                  MSG_CONNECT_TRANSNO);
1580                 if (has_transno && transno == 0)
1581                         CWARN("Connect with zero transno!\n");
1582
1583                 if (has_transno && transno > 0 &&
1584                     transno < target->obd_next_recovery_transno &&
1585                     transno > target->obd_last_committed) {
1586                         /* Another way is to use cmpxchg() to be lock-free. */
1587                         spin_lock(&target->obd_recovery_task_lock);
1588                         if (transno < target->obd_next_recovery_transno)
1589                                 target->obd_next_recovery_transno = transno;
1590                         spin_unlock(&target->obd_recovery_task_lock);
1591                 }
1592
1593                 atomic_inc(&target->obd_req_replay_clients);
1594                 atomic_inc(&target->obd_lock_replay_clients);
1595                 /*
1596                  * Note: MDS-MDS connection is allowed to be connected during
1597                  * recovery, no matter if the exports needs to be recoveried.
1598                  * Because we need retrieve updates logs from all other MDTs.
1599                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1600                  * also needs to be increased to match other recovery checking
1601                  * condition.
1602                  */
1603                 if (new_mds_mds_conn)
1604                         atomic_inc(&target->obd_max_recoverable_clients);
1605
1606                 if (atomic_inc_return(&target->obd_connected_clients) ==
1607                     atomic_read(&target->obd_max_recoverable_clients))
1608                         wake_up(&target->obd_next_transno_waitq);
1609         }
1610
1611         /* Tell the client we're in recovery, when client is involved in it. */
1612         if (target->obd_recovering && !lw_client)
1613                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1614
1615 out:
1616         if (export) {
1617                 spin_lock(&export->exp_lock);
1618                 export->exp_connecting = 0;
1619                 spin_unlock(&export->exp_lock);
1620
1621                 class_export_put(export);
1622         }
1623         if (target != NULL) {
1624                 spin_lock(&target->obd_dev_lock);
1625                 target->obd_conn_inprogress--;
1626                 spin_unlock(&target->obd_dev_lock);
1627                 class_decref(target, "find", current);
1628         }
1629         if (pcon)
1630                 ptlrpc_connection_put(pcon);
1631         req->rq_status = rc;
1632         RETURN(rc);
1633 }
1634
1635 int target_handle_disconnect(struct ptlrpc_request *req)
1636 {
1637         int rc;
1638
1639         ENTRY;
1640
1641         rc = req_capsule_server_pack(&req->rq_pill);
1642         if (rc)
1643                 RETURN(rc);
1644
1645         /* In case of target disconnect, updating sec ctx immediately is
1646          * required in order to record latest sequence number used.
1647          * Sequence is normally updated on export destroy, but this event
1648          * can occur too late, ie after a new target connect request has
1649          * been processed.
1650          * Maintaining correct sequence when client connection becomes idle
1651          * ensures that GSS does not erroneously consider requests as replays.
1652          */
1653         rc = sptlrpc_export_update_ctx(req->rq_export);
1654         if (rc)
1655                 RETURN(rc);
1656
1657         /* Keep the rq_export around so we can send the reply. */
1658         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1659
1660         RETURN(0);
1661 }
1662
1663 void target_destroy_export(struct obd_export *exp)
1664 {
1665         struct obd_import *imp = NULL;
1666         /*
1667          * exports created from last_rcvd data, and "fake"
1668          * exports created by lctl don't have an import
1669          */
1670         spin_lock(&exp->exp_lock);
1671         if (exp->exp_imp_reverse != NULL) {
1672                 imp = exp->exp_imp_reverse;
1673                 exp->exp_imp_reverse = NULL;
1674         }
1675         spin_unlock(&exp->exp_lock);
1676         if (imp != NULL)
1677                 client_destroy_import(imp);
1678
1679         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1680         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1681         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1682         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1683 }
1684 EXPORT_SYMBOL(target_destroy_export);
1685
1686 /*
1687  * Recovery functions
1688  */
1689 static void target_request_copy_get(struct ptlrpc_request *req)
1690 {
1691         class_export_rpc_inc(req->rq_export);
1692         LASSERT(list_empty(&req->rq_list));
1693         INIT_LIST_HEAD(&req->rq_replay_list);
1694
1695         /* Increase refcount to keep request in queue. */
1696         atomic_inc(&req->rq_refcount);
1697         /* Let export know it has replays to be handled. */
1698         atomic_inc(&req->rq_export->exp_replay_count);
1699 }
1700
1701 static void target_request_copy_put(struct ptlrpc_request *req)
1702 {
1703         LASSERT(list_empty(&req->rq_replay_list));
1704         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1705
1706         atomic_dec(&req->rq_export->exp_replay_count);
1707         class_export_rpc_dec(req->rq_export);
1708         ptlrpc_server_drop_request(req);
1709 }
1710
1711 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1712 {
1713         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1714         struct obd_export *exp = req->rq_export;
1715         struct ptlrpc_request *reqiter;
1716         struct ptlrpc_request *dup_req = NULL;
1717         int dup = 0;
1718
1719         LASSERT(exp);
1720
1721         spin_lock(&exp->exp_lock);
1722         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1723                             rq_replay_list) {
1724                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1725                         dup_req = reqiter;
1726                         dup = 1;
1727                         break;
1728                 }
1729         }
1730
1731         if (dup) {
1732                 /* We expect it with RESENT and REPLAY flags. */
1733                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1734                     (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1735                         CERROR("invalid flags %x of resent replay\n",
1736                                lustre_msg_get_flags(req->rq_reqmsg));
1737
1738                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1739                         __u32 new_conn;
1740
1741                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1742                         if (new_conn >
1743                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1744                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1745                                                         new_conn);
1746                 }
1747         } else {
1748                 list_add_tail(&req->rq_replay_list,
1749                               &exp->exp_req_replay_queue);
1750         }
1751
1752         spin_unlock(&exp->exp_lock);
1753         return dup;
1754 }
1755
1756 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1757 {
1758         LASSERT(!list_empty(&req->rq_replay_list));
1759         LASSERT(req->rq_export);
1760
1761         spin_lock(&req->rq_export->exp_lock);
1762         list_del_init(&req->rq_replay_list);
1763         spin_unlock(&req->rq_export->exp_lock);
1764 }
1765
1766 static void target_finish_recovery(struct lu_target *lut)
1767 {
1768         struct obd_device *obd = lut->lut_obd;
1769
1770         ENTRY;
1771
1772         /* Only log a recovery message when recovery has occurred. */
1773         if (obd->obd_recovery_start) {
1774                 time64_t now = ktime_get_seconds();
1775                 time64_t elapsed_time;
1776
1777                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start,
1778                                      1);
1779                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients %d recovered and %d %s evicted.\n",
1780                               obd->obd_name, elapsed_time / 60,
1781                               elapsed_time % 60,
1782                               atomic_read(&obd->obd_max_recoverable_clients),
1783                               atomic_read(&obd->obd_connected_clients),
1784                               obd->obd_stale_clients,
1785                               obd->obd_stale_clients == 1 ? "was" : "were");
1786                 if (obd->obd_stale_clients && do_dump_on_eviction(obd))
1787                         libcfs_debug_dumplog();
1788         }
1789
1790         ldlm_reprocess_recovery_done(obd->obd_namespace);
1791         spin_lock(&obd->obd_recovery_task_lock);
1792         if (!list_empty(&obd->obd_req_replay_queue) ||
1793             !list_empty(&obd->obd_lock_replay_queue) ||
1794             !list_empty(&obd->obd_final_req_queue)) {
1795                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1796                        obd->obd_name,
1797                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1798                        list_empty(&obd->obd_lock_replay_queue) ? \
1799                                   "" : "lock ",
1800                        list_empty(&obd->obd_final_req_queue) ? \
1801                                   "" : "final ");
1802                 spin_unlock(&obd->obd_recovery_task_lock);
1803                 LBUG();
1804         }
1805         spin_unlock(&obd->obd_recovery_task_lock);
1806
1807         obd->obd_recovery_end = ktime_get_seconds();
1808
1809         /* When recovery finished, cleanup orphans on MDS and OST. */
1810         if (obd->obd_type && OBP(obd, postrecov)) {
1811                 int rc = OBP(obd, postrecov)(obd);
1812
1813                 if (rc < 0)
1814                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1815                                       obd->obd_name, rc);
1816         }
1817         EXIT;
1818 }
1819
1820 static void abort_req_replay_queue(struct obd_device *obd)
1821 {
1822         struct ptlrpc_request *req, *n;
1823         LIST_HEAD(abort_list);
1824
1825         spin_lock(&obd->obd_recovery_task_lock);
1826         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1827         spin_unlock(&obd->obd_recovery_task_lock);
1828         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1829                 DEBUG_REQ(D_WARNING, req, "aborted:");
1830                 req->rq_status = -ENOTCONN;
1831                 if (ptlrpc_error(req)) {
1832                         DEBUG_REQ(D_ERROR, req,
1833                                   "failed abort_req_reply; skipping");
1834                 }
1835                 target_exp_dequeue_req_replay(req);
1836                 target_request_copy_put(req);
1837         }
1838 }
1839
1840 static void abort_lock_replay_queue(struct obd_device *obd)
1841 {
1842         struct ptlrpc_request *req, *n;
1843         LIST_HEAD(abort_list);
1844
1845         spin_lock(&obd->obd_recovery_task_lock);
1846         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1847         spin_unlock(&obd->obd_recovery_task_lock);
1848         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1849                 DEBUG_REQ(D_ERROR, req, "aborted:");
1850                 req->rq_status = -ENOTCONN;
1851                 if (ptlrpc_error(req)) {
1852                         DEBUG_REQ(D_ERROR, req,
1853                                   "failed abort_lock_reply; skipping");
1854                 }
1855                 target_request_copy_put(req);
1856         }
1857 }
1858
1859 /*
1860  * Called from a cleanup function if the device is being cleaned up
1861  * forcefully.  The exports should all have been disconnected already,
1862  * the only thing left to do is
1863  * - clear the recovery flags
1864  * - cancel the timer
1865  * - free queued requests and replies, but don't send replies
1866  * Because the obd_stopping flag is set, no new requests should be received.
1867  */
1868 void target_cleanup_recovery(struct obd_device *obd)
1869 {
1870         struct ptlrpc_request *req, *n;
1871         LIST_HEAD(clean_list);
1872
1873         spin_lock(&obd->obd_dev_lock);
1874         if (!obd->obd_recovering) {
1875                 spin_unlock(&obd->obd_dev_lock);
1876                 EXIT;
1877                 return;
1878         }
1879         obd->obd_recovering = 0;
1880         obd->obd_abort_recovery = 0;
1881         obd->obd_abort_mdt_recovery = 0;
1882         spin_unlock(&obd->obd_dev_lock);
1883
1884         spin_lock(&obd->obd_recovery_task_lock);
1885         target_cancel_recovery_timer(obd);
1886         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1887         spin_unlock(&obd->obd_recovery_task_lock);
1888
1889         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1890                 LASSERT(req->rq_reply_state == NULL);
1891                 target_exp_dequeue_req_replay(req);
1892                 target_request_copy_put(req);
1893         }
1894
1895         spin_lock(&obd->obd_recovery_task_lock);
1896         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1897         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1898         spin_unlock(&obd->obd_recovery_task_lock);
1899
1900         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1901                 LASSERT(req->rq_reply_state == NULL);
1902                 target_request_copy_put(req);
1903         }
1904
1905         EXIT;
1906 }
1907 EXPORT_SYMBOL(target_cleanup_recovery);
1908
1909 /* obd_recovery_task_lock should be held */
1910 void target_cancel_recovery_timer(struct obd_device *obd)
1911 {
1912         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1913         hrtimer_cancel(&obd->obd_recovery_timer);
1914 }
1915
1916 static void target_start_recovery_timer(struct obd_device *obd)
1917 {
1918         ktime_t delay;
1919
1920         if (obd->obd_recovery_start != 0)
1921                 return;
1922
1923         spin_lock(&obd->obd_dev_lock);
1924         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1925                 spin_unlock(&obd->obd_dev_lock);
1926                 return;
1927         }
1928
1929         LASSERT(obd->obd_recovery_timeout != 0);
1930
1931         if (obd->obd_recovery_start != 0) {
1932                 spin_unlock(&obd->obd_dev_lock);
1933                 return;
1934         }
1935
1936         obd->obd_recovery_start = ktime_get_seconds();
1937         delay = ktime_set(obd->obd_recovery_start +
1938                           obd->obd_recovery_timeout, 0);
1939         hrtimer_start(&obd->obd_recovery_timer, delay, HRTIMER_MODE_ABS);
1940         spin_unlock(&obd->obd_dev_lock);
1941
1942         LCONSOLE_WARN("%s: Will be in recovery for at least %u:%02u, or until %d client%s reconnect%s\n",
1943                       obd->obd_name,
1944                       obd->obd_recovery_timeout / 60,
1945                       obd->obd_recovery_timeout % 60,
1946                       atomic_read(&obd->obd_max_recoverable_clients),
1947                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1948                       "" : "s",
1949                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1950                       "s" : "");
1951 }
1952
1953 /**
1954  * extend recovery window.
1955  *
1956  * if @extend is true, extend recovery window to have @dr_timeout remaining
1957  * at least; otherwise, make sure the recovery timeout value is not less
1958  * than @dr_timeout.
1959  */
1960 static void extend_recovery_timer(struct obd_device *obd, timeout_t dr_timeout,
1961                                   bool extend)
1962 {
1963         ktime_t left_ns;
1964         timeout_t timeout;
1965         timeout_t left;
1966
1967         spin_lock(&obd->obd_dev_lock);
1968         if (!obd->obd_recovering || obd->obd_abort_recovery ||
1969             obd->obd_stopping) {
1970                 spin_unlock(&obd->obd_dev_lock);
1971                 return;
1972         }
1973         LASSERT(obd->obd_recovery_start != 0);
1974
1975         left_ns = hrtimer_get_remaining(&obd->obd_recovery_timer);
1976         left = ktime_divns(left_ns, NSEC_PER_SEC);
1977
1978         if (extend) {
1979                 timeout = obd->obd_recovery_timeout;
1980                 /* dr_timeout will happen after the hrtimer has expired.
1981                  * Add the excess time to the soft recovery timeout without
1982                  * exceeding the hard recovery timeout.
1983                  */
1984                 if (dr_timeout > left) {
1985                         timeout += dr_timeout - left;
1986                         timeout = min_t(timeout_t, obd->obd_recovery_time_hard,
1987                                         timeout);
1988                 }
1989         } else {
1990                 timeout = clamp_t(timeout_t, dr_timeout,
1991                                   obd->obd_recovery_timeout,
1992                                   obd->obd_recovery_time_hard);
1993         }
1994
1995         if (timeout == obd->obd_recovery_time_hard)
1996                 CWARN("%s: extended recovery timer reached hard limit: %d, extend: %d\n",
1997                       obd->obd_name, timeout, extend);
1998
1999         if (obd->obd_recovery_timeout < timeout) {
2000                 ktime_t end, now;
2001
2002                 obd->obd_recovery_timeout = timeout;
2003                 end = ktime_set(obd->obd_recovery_start + timeout, 0);
2004                 now = ktime_set(ktime_get_seconds(), 0);
2005                 left_ns = ktime_sub(end, now);
2006                 hrtimer_start(&obd->obd_recovery_timer, end, HRTIMER_MODE_ABS);
2007                 left = ktime_divns(left_ns, NSEC_PER_SEC);
2008         }
2009         spin_unlock(&obd->obd_dev_lock);
2010
2011         CDEBUG(D_HA, "%s: recovery timer will expire in %d seconds\n",
2012                 obd->obd_name, left);
2013 }
2014
2015 /* Reset the timer with each new client connection */
2016 /*
2017  * This timer is actually reconnect_timer, which is for making sure
2018  * the total recovery window is at least as big as my reconnect
2019  * attempt timing. So the initial recovery time_out will be set to
2020  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
2021  * from client is bigger than this, then the recovery time_out will
2022  * be extended to make sure the client could be reconnected, in the
2023  * process, the timeout from the new client should be ignored.
2024  */
2025 static void
2026 check_and_start_recovery_timer(struct obd_device *obd,
2027                                struct ptlrpc_request *req,
2028                                int new_client)
2029 {
2030         timeout_t service_timeout = lustre_msg_get_service_timeout(req->rq_reqmsg);
2031         struct obd_device_target *obt = obd2obt(obd);
2032
2033         if (!new_client && service_timeout)
2034                 /*
2035                  * Teach server about old server's estimates, as first guess
2036                  * at how long new requests will take.
2037                  */
2038                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
2039                             service_timeout);
2040
2041         target_start_recovery_timer(obd);
2042
2043         /*
2044          * Convert the service time to RPC timeout,
2045          * and reuse service_timeout to limit stack usage.
2046          */
2047         service_timeout = at_est2timeout(service_timeout);
2048
2049         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
2050             service_timeout < at_extra)
2051                 service_timeout = at_extra;
2052
2053         /*
2054          * We expect other clients to timeout within service_timeout, then try
2055          * to reconnect, then try the failover server.  The max delay between
2056          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL.
2057          */
2058         service_timeout += 2 * INITIAL_CONNECT_TIMEOUT;
2059
2060         LASSERT(obt->obt_magic == OBT_MAGIC);
2061         service_timeout += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
2062         if (service_timeout > obd->obd_recovery_timeout && !new_client)
2063                 extend_recovery_timer(obd, service_timeout, false);
2064 }
2065
2066 /** Health checking routines */
2067 static inline int exp_connect_healthy(struct obd_export *exp)
2068 {
2069         return exp->exp_in_recovery;
2070 }
2071
2072 /** if export done req_replay or has replay in queue */
2073 static inline int exp_req_replay_healthy(struct obd_export *exp)
2074 {
2075         return (!exp->exp_req_replay_needed ||
2076                 atomic_read(&exp->exp_replay_count) > 0);
2077 }
2078
2079
2080 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
2081 {
2082         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
2083                exp_req_replay_healthy(exp);
2084 }
2085
2086 /** if export done lock_replay or has replay in queue */
2087 static inline int exp_lock_replay_healthy(struct obd_export *exp)
2088 {
2089         return (!exp->exp_lock_replay_needed ||
2090                 atomic_read(&exp->exp_replay_count) > 0);
2091 }
2092
2093 static inline int exp_vbr_healthy(struct obd_export *exp)
2094 {
2095         return !exp->exp_vbr_failed;
2096 }
2097
2098 static inline int exp_finished(struct obd_export *exp)
2099 {
2100         return exp->exp_in_recovery && !exp->exp_lock_replay_needed;
2101 }
2102
2103 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
2104 {
2105         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
2106                 exp_finished(exp);
2107 }
2108
2109 static int check_for_next_transno(struct lu_target *lut)
2110 {
2111         struct ptlrpc_request *req = NULL;
2112         struct obd_device *obd = lut->lut_obd;
2113         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2114         int wake_up = 0, connected, completed, queue_len;
2115         __u64 req_transno = 0;
2116         __u64 update_transno = 0;
2117         __u64 next_transno = 0;
2118
2119         ENTRY;
2120
2121         spin_lock(&obd->obd_recovery_task_lock);
2122         if (!list_empty(&obd->obd_req_replay_queue)) {
2123                 req = list_entry(obd->obd_req_replay_queue.next,
2124                                      struct ptlrpc_request, rq_list);
2125                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
2126         }
2127
2128         if (!obd_mdt_recovery_abort(obd) && tdtd)
2129                 update_transno = distribute_txn_get_next_transno(tdtd);
2130
2131         connected = atomic_read(&obd->obd_connected_clients);
2132         completed = connected - atomic_read(&obd->obd_req_replay_clients);
2133         queue_len = obd->obd_requests_queued_for_recovery;
2134         next_transno = obd->obd_next_recovery_transno;
2135
2136         CDEBUG(D_HA,
2137                "max: %d, connected: %d, completed: %d, queue_len: %d, req_transno: %llu, next_transno: %llu\n",
2138                atomic_read(&obd->obd_max_recoverable_clients),
2139                connected, completed,
2140                queue_len, req_transno, next_transno);
2141
2142         if (obd_recovery_abort(obd)) {
2143                 CDEBUG(D_HA, "waking for aborted recovery\n");
2144                 wake_up = 1;
2145         } else if (obd->obd_recovery_expired) {
2146                 CDEBUG(D_HA, "waking for expired recovery\n");
2147                 wake_up = 1;
2148         } else if (!obd_mdt_recovery_abort(obd) && tdtd && req &&
2149                    is_req_replayed_by_update(req)) {
2150                 LASSERTF(req_transno < next_transno,
2151                          "req_transno %llu next_transno%llu\n", req_transno,
2152                          next_transno);
2153                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
2154                        req_transno);
2155                 wake_up = 1;
2156         } else if (req_transno == next_transno ||
2157                    (update_transno != 0 && update_transno <= next_transno)) {
2158                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
2159                 wake_up = 1;
2160         } else if (queue_len > 0 &&
2161                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
2162                 /** handle gaps occured due to lost reply or VBR */
2163                 LASSERTF(req_transno >= next_transno,
2164                          "req_transno: %llu, next_transno: %llu\n",
2165                          req_transno, next_transno);
2166                 CDEBUG(D_HA,
2167                        "%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",
2168                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
2169                        next_transno, queue_len, completed, connected,
2170                        req_transno, update_transno, obd->obd_last_committed);
2171                 obd->obd_next_recovery_transno = req_transno;
2172                 wake_up = 1;
2173         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
2174                 CDEBUG(D_HA, "waking for completed recovery\n");
2175                 wake_up = 1;
2176         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
2177                 CDEBUG(D_HA,
2178                        "accepting transno gaps is explicitly allowed by fail_lock, waking up (%lld)\n",
2179                        next_transno);
2180                 obd->obd_next_recovery_transno = req_transno;
2181                 wake_up = 1;
2182         }
2183         spin_unlock(&obd->obd_recovery_task_lock);
2184         return wake_up;
2185 }
2186
2187 static int check_for_next_lock(struct lu_target *lut)
2188 {
2189         struct obd_device *obd = lut->lut_obd;
2190         int wake_up = 0;
2191
2192         spin_lock(&obd->obd_recovery_task_lock);
2193         if (!list_empty(&obd->obd_lock_replay_queue)) {
2194                 CDEBUG(D_HA, "waking for next lock\n");
2195                 wake_up = 1;
2196         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
2197                 CDEBUG(D_HA, "waking for completed lock replay\n");
2198                 wake_up = 1;
2199         } else if (obd->obd_abort_recovery) {
2200                 CDEBUG(D_HA, "waking for aborted recovery\n");
2201                 wake_up = 1;
2202         } else if (obd->obd_recovery_expired) {
2203                 CDEBUG(D_HA, "waking for expired recovery\n");
2204                 wake_up = 1;
2205         }
2206         spin_unlock(&obd->obd_recovery_task_lock);
2207
2208         return wake_up;
2209 }
2210
2211 static int check_update_llog(struct lu_target *lut)
2212 {
2213         struct obd_device *obd = lut->lut_obd;
2214         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2215
2216         if (obd_mdt_recovery_abort(obd)) {
2217                 CDEBUG(D_HA, "waking for aborted recovery\n");
2218                 return 1;
2219         }
2220
2221         if (atomic_read(&tdtd->tdtd_recovery_threads_count) == 0) {
2222                 CDEBUG(D_HA, "waking for completion of reading update log\n");
2223                 return 1;
2224         }
2225
2226         return 0;
2227 }
2228
2229 /**
2230  * wait for recovery events,
2231  * check its status with help of check_routine
2232  * evict dead clients via health_check
2233  */
2234 static int target_recovery_overseer(struct lu_target *lut,
2235                                     int (*check_routine)(struct lu_target *),
2236                                     int (*health_check)(struct obd_export *))
2237 {
2238         struct obd_device *obd = lut->lut_obd;
2239         struct target_distribute_txn_data *tdtd;
2240         time64_t last = 0;
2241         time64_t now;
2242 repeat:
2243         if (obd->obd_recovering && obd->obd_recovery_start == 0) {
2244                 now = ktime_get_seconds();
2245                 if (now - last > 600) {
2246                         LCONSOLE_INFO("%s: in recovery but waiting for the first client to connect\n",
2247                                       obd->obd_name);
2248                         last = now;
2249                 }
2250         }
2251         if (obd->obd_recovery_start != 0 && ktime_get_seconds() >=
2252               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
2253                 __u64 next_update_transno = 0;
2254
2255                 /*
2256                  * Only abort the recovery if there are no update recovery
2257                  * left in the queue
2258                  */
2259                 spin_lock(&obd->obd_recovery_task_lock);
2260                 if (!obd_mdt_recovery_abort(obd) && lut->lut_tdtd) {
2261                         next_update_transno =
2262                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2263
2264                         tdtd = lut->lut_tdtd;
2265                         /*
2266                          * If next_update_transno == 0, it probably because
2267                          * updatelog retrieve threads did not get any records
2268                          * yet, let's wait those threads stopped
2269                          */
2270                         if (next_update_transno == 0) {
2271                                 spin_unlock(&obd->obd_recovery_task_lock);
2272
2273                                 while (wait_event_timeout(
2274                                         tdtd->tdtd_recovery_threads_waitq,
2275                                         check_update_llog(lut),
2276                                         cfs_time_seconds(60)) == 0);
2277
2278                                 spin_lock(&obd->obd_recovery_task_lock);
2279                                 next_update_transno =
2280                                         distribute_txn_get_next_transno(tdtd);
2281                         }
2282                 }
2283
2284                 if (next_update_transno != 0 && !obd_recovery_abort(obd)) {
2285                         obd->obd_next_recovery_transno = next_update_transno;
2286                         spin_unlock(&obd->obd_recovery_task_lock);
2287                         /*
2288                          * Disconnect unfinished exports from clients, and
2289                          * keep connection from MDT to make sure the update
2290                          * recovery will still keep trying until some one
2291                          * manually abort the recovery
2292                          */
2293                         class_disconnect_stale_exports(obd,
2294                                                 exp_finished_or_from_mdt);
2295                         /* Abort all of replay & replay lock req from clients */
2296                         abort_req_replay_queue(obd);
2297                         abort_lock_replay_queue(obd);
2298                         CDEBUG(D_HA,
2299                                "%s: there are still update replay (%#llx)in the queue.\n",
2300                                obd->obd_name, next_update_transno);
2301                 } else {
2302                         obd->obd_abort_recovery = 1;
2303                         spin_unlock(&obd->obd_recovery_task_lock);
2304                         CWARN("%s recovery is aborted by hard timeout\n",
2305                               obd->obd_name);
2306                 }
2307         }
2308
2309         while (wait_event_timeout(obd->obd_next_transno_waitq,
2310                                   check_routine(lut),
2311                                   cfs_time_seconds(60)) == 0)
2312                 ; /* wait indefinitely for event, but don't trigger watchdog */
2313
2314         if (obd_recovery_abort(obd)) {
2315                 CWARN("recovery is aborted, evict exports in recovery\n");
2316                 if (lut->lut_tdtd != NULL) {
2317                         tdtd = lut->lut_tdtd;
2318                         /*
2319                          * Let's wait all of the update log recovery thread
2320                          * finished
2321                          */
2322                         wait_event_idle(
2323                                 tdtd->tdtd_recovery_threads_waitq,
2324                                 atomic_read(&tdtd->tdtd_recovery_threads_count)
2325                                 == 0);
2326                         /* Then abort the update recovery list */
2327                         dtrq_list_destroy(lut->lut_tdtd);
2328                 }
2329
2330                 /** evict exports which didn't finish recovery yet */
2331                 class_disconnect_stale_exports(obd, exp_finished);
2332                 return 1;
2333         } else if (obd->obd_recovery_expired) {
2334                 obd->obd_recovery_expired = 0;
2335
2336                 /** If some clients died being recovered, evict them */
2337                 LCONSOLE_WARN("%s: recovery is timed out, evict stale exports\n",
2338                               obd->obd_name);
2339                 /** evict cexports with no replay in queue, they are stalled */
2340                 class_disconnect_stale_exports(obd, health_check);
2341
2342                 /** continue with VBR */
2343                 spin_lock(&obd->obd_dev_lock);
2344                 obd->obd_version_recov = 1;
2345                 spin_unlock(&obd->obd_dev_lock);
2346                 /**
2347                  * reset timer, recovery will proceed with versions now,
2348                  * timeout is set just to handle reconnection delays
2349                  */
2350                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2351                 /**
2352                  * Wait for recovery events again, after evicting bad clients
2353                  */
2354                 goto repeat;
2355         }
2356         return 0;
2357 }
2358
2359 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2360 {
2361         struct obd_device *obd = lut->lut_obd;
2362         struct ptlrpc_request *req = NULL;
2363
2364         CDEBUG(D_HA, "Waiting for lock\n");
2365         if (target_recovery_overseer(lut, check_for_next_lock,
2366                                      exp_lock_replay_healthy))
2367                 abort_lock_replay_queue(obd);
2368
2369         spin_lock(&obd->obd_recovery_task_lock);
2370         if (!list_empty(&obd->obd_lock_replay_queue)) {
2371                 req = list_entry(obd->obd_lock_replay_queue.next,
2372                                      struct ptlrpc_request, rq_list);
2373                 list_del_init(&req->rq_list);
2374                 spin_unlock(&obd->obd_recovery_task_lock);
2375         } else {
2376                 spin_unlock(&obd->obd_recovery_task_lock);
2377                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2378                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2379                 /** evict exports failed VBR */
2380                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2381         }
2382         return req;
2383 }
2384
2385 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2386 {
2387         struct ptlrpc_request *req = NULL;
2388
2389         spin_lock(&obd->obd_recovery_task_lock);
2390         if (!list_empty(&obd->obd_final_req_queue)) {
2391                 req = list_entry(obd->obd_final_req_queue.next,
2392                                      struct ptlrpc_request, rq_list);
2393                 list_del_init(&req->rq_list);
2394                 spin_unlock(&obd->obd_recovery_task_lock);
2395                 if (req->rq_export->exp_in_recovery) {
2396                         spin_lock(&req->rq_export->exp_lock);
2397                         req->rq_export->exp_in_recovery = 0;
2398                         spin_unlock(&req->rq_export->exp_lock);
2399                 }
2400         } else {
2401                 spin_unlock(&obd->obd_recovery_task_lock);
2402         }
2403         return req;
2404 }
2405
2406 static void handle_recovery_req(struct ptlrpc_thread *thread,
2407                                 struct ptlrpc_request *req,
2408                                 svc_handler_t handler)
2409 {
2410         ENTRY;
2411
2412         /**
2413          * export can be evicted during recovery, no need to handle replays for
2414          * it after that, discard such request silently
2415          */
2416         if (req->rq_export->exp_disconnected)
2417                 RETURN_EXIT;
2418
2419         req->rq_session.lc_thread = thread;
2420         req->rq_svc_thread = thread;
2421         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2422
2423         /* thread context */
2424         lu_context_enter(&thread->t_env->le_ctx);
2425         (void)handler(req);
2426         lu_context_exit(&thread->t_env->le_ctx);
2427
2428         req->rq_svc_thread->t_env->le_ses = NULL;
2429
2430         /* don't reset timer for final stage */
2431         if (!exp_finished(req->rq_export)) {
2432                 timeout_t timeout = obd_timeout;
2433
2434                 /**
2435                  * Add request @timeout to the recovery time so next request from
2436                  * this client may come in recovery time
2437                  */
2438                 if (!AT_OFF) {
2439                         struct ptlrpc_service_part *svcpt;
2440                         timeout_t est_timeout;
2441
2442                         svcpt = req->rq_rqbd->rqbd_svcpt;
2443                         /*
2444                          * If the server sent early reply for this request,
2445                          * the client will recalculate the timeout according to
2446                          * current server estimate service time, so we will
2447                          * use the maxium timeout here for waiting the client
2448                          * sending the next req
2449                          */
2450                         est_timeout = at_get(&svcpt->scp_at_estimate);
2451                         timeout = max_t(timeout_t, at_est2timeout(est_timeout),
2452                                         lustre_msg_get_timeout(req->rq_reqmsg));
2453                         /*
2454                          * Add 2 net_latency, one for balance rq_deadline
2455                          * (see ptl_send_rpc), one for resend the req to server,
2456                          * Note: client will pack net_latency in replay req
2457                          * (see ptlrpc_replay_req)
2458                          */
2459                         timeout += 2 * lustre_msg_get_service_timeout(req->rq_reqmsg);
2460                 }
2461                 extend_recovery_timer(class_exp2obd(req->rq_export), timeout,
2462                                       true);
2463         }
2464         EXIT;
2465 }
2466
2467 /** Checking routines for recovery */
2468 static int check_for_recovery_ready(struct lu_target *lut)
2469 {
2470         struct obd_device *obd = lut->lut_obd;
2471         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2472
2473         CDEBUG(D_HA,
2474                "connected %d stale %d max_recoverable_clients %d abort %d expired %d\n",
2475                clnts, obd->obd_stale_clients,
2476                atomic_read(&obd->obd_max_recoverable_clients),
2477                obd->obd_abort_recovery, obd->obd_recovery_expired);
2478
2479         if (!obd_recovery_abort(obd) && !obd->obd_recovery_expired) {
2480                 LASSERT(clnts <=
2481                         atomic_read(&obd->obd_max_recoverable_clients));
2482                 if (clnts + obd->obd_stale_clients <
2483                     atomic_read(&obd->obd_max_recoverable_clients))
2484                         return 0;
2485         }
2486
2487         if (!obd_mdt_recovery_abort(obd) && lut->lut_tdtd &&
2488             !lut->lut_tdtd->tdtd_replay_ready) {
2489                 /* Let's extend recovery timer, in case the recovery timer
2490                  * expired, and some clients got evicted
2491                  */
2492                 extend_recovery_timer(obd, obd->obd_recovery_timeout, 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         return 1;
2500 }
2501
2502 enum {
2503         REQUEST_RECOVERY = 1,
2504         UPDATE_RECOVERY = 2,
2505 };
2506
2507 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2508 {
2509         __u64 transno = 0;
2510
2511         if (!list_empty(&obd->obd_req_replay_queue)) {
2512                 struct ptlrpc_request *req;
2513
2514                 req = list_entry(obd->obd_req_replay_queue.next,
2515                                  struct ptlrpc_request, rq_list);
2516                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2517         }
2518
2519         return transno;
2520 }
2521
2522 static __u64 get_next_transno(struct lu_target *lut, int *type)
2523 {
2524         struct obd_device *obd = lut->lut_obd;
2525         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2526         __u64 transno = 0;
2527         __u64 update_transno;
2528
2529         ENTRY;
2530
2531         transno = get_next_replay_req_transno(obd);
2532         if (type != NULL)
2533                 *type = REQUEST_RECOVERY;
2534
2535         if (!tdtd || obd_mdt_recovery_abort(obd))
2536                 RETURN(transno);
2537
2538         update_transno = distribute_txn_get_next_transno(tdtd);
2539         if (transno == 0 || (transno >= update_transno &&
2540                              update_transno != 0)) {
2541                 transno = update_transno;
2542                 if (type != NULL)
2543                         *type = UPDATE_RECOVERY;
2544         }
2545
2546         RETURN(transno);
2547 }
2548
2549 /**
2550  * drop duplicate replay request
2551  *
2552  * Because the operation has been replayed by update recovery, the request
2553  * with the same transno will be dropped and also notify the client to send
2554  * next replay request.
2555  *
2556  * \param[in] env       execution environment
2557  * \param[in] obd       failover obd device
2558  * \param[in] req       request to be dropped
2559  */
2560 static void drop_duplicate_replay_req(struct lu_env *env,
2561                                       struct obd_device *obd,
2562                                       struct ptlrpc_request *req)
2563 {
2564         DEBUG_REQ(D_HA, req,
2565                   "remove t%lld from %s because duplicate update records found",
2566                   lustre_msg_get_transno(req->rq_reqmsg),
2567                   libcfs_nidstr(&req->rq_peer.nid));
2568
2569         /*
2570          * Right now, only for MDS reint operation update replay and
2571          * normal request replay can have the same transno
2572          */
2573         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT) {
2574                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2575                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2576                 if (likely(req->rq_export))
2577                         target_committed_to_req(req);
2578                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2579                 target_send_reply(req, req->rq_status, 0);
2580         } else {
2581                 DEBUG_REQ(D_ERROR, req, "wrong opc from %s",
2582                 libcfs_nidstr(&req->rq_peer.nid));
2583         }
2584         target_exp_dequeue_req_replay(req);
2585         target_request_copy_put(req);
2586         obd->obd_replayed_requests++;
2587 }
2588
2589 #define WATCHDOG_TIMEOUT (obd_timeout * 10)
2590
2591 static void replay_request_or_update(struct lu_env *env,
2592                                      struct lu_target *lut,
2593                                      struct target_recovery_data *trd,
2594                                      struct ptlrpc_thread *thread)
2595 {
2596         struct obd_device *obd = lut->lut_obd;
2597         struct ptlrpc_request *req = NULL;
2598         int type;
2599         __u64 transno;
2600
2601         ENTRY;
2602
2603         CDEBUG(D_HA, "Waiting for transno %lld\n",
2604                obd->obd_next_recovery_transno);
2605
2606         /* Replay all of request and update by transno */
2607         do {
2608                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2609
2610                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2611
2612                 /**
2613                  * It is needed to extend recovery window above
2614                  *  recovery_time_soft. Extending is possible only in the
2615                  *  end of recovery window (see more details in
2616                  *  handle_recovery_req()).
2617                  */
2618                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2619
2620                 if (target_recovery_overseer(lut, check_for_next_transno,
2621                                         exp_req_replay_healthy_or_from_mdt)) {
2622                         abort_req_replay_queue(obd);
2623                         abort_lock_replay_queue(obd);
2624                         goto abort;
2625                 }
2626
2627                 spin_lock(&obd->obd_recovery_task_lock);
2628                 transno = get_next_transno(lut, &type);
2629                 if (type == REQUEST_RECOVERY && transno != 0) {
2630                         /*
2631                          * Drop replay request from client side, if the
2632                          * replay has been executed by update with the
2633                          * same transno
2634                          */
2635                         req = list_entry(obd->obd_req_replay_queue.next,
2636                                         struct ptlrpc_request, rq_list);
2637
2638                         list_del_init(&req->rq_list);
2639                         obd->obd_requests_queued_for_recovery--;
2640                         spin_unlock(&obd->obd_recovery_task_lock);
2641
2642                         /*
2643                          * Let's check if the request has been redone by
2644                          * update replay
2645                          */
2646                         if (is_req_replayed_by_update(req)) {
2647                                 struct distribute_txn_replay_req *dtrq;
2648
2649                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2650                                                                       transno);
2651                                 LASSERT(dtrq != NULL);
2652                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2653                                 list_del_init(&dtrq->dtrq_list);
2654                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2655                                 dtrq_destroy(dtrq);
2656
2657                                 drop_duplicate_replay_req(env, obd, req);
2658
2659                                 continue;
2660                         }
2661
2662                         LASSERT(trd->trd_processing_task == current->pid);
2663                         DEBUG_REQ(D_HA, req, "processing x%llu t%lld from %s",
2664                                   req->rq_xid,
2665                                   lustre_msg_get_transno(req->rq_reqmsg),
2666                                   libcfs_nidstr(&req->rq_peer.nid));
2667
2668                         ptlrpc_watchdog_init(&thread->t_watchdog,
2669                                              WATCHDOG_TIMEOUT);
2670                         handle_recovery_req(thread, req,
2671                                             trd->trd_recovery_handler);
2672                         ptlrpc_watchdog_disable(&thread->t_watchdog);
2673
2674                         /**
2675                          * bz18031: increase next_recovery_transno before
2676                          * target_request_copy_put() will drop exp_rpc reference
2677                          */
2678                         spin_lock(&obd->obd_recovery_task_lock);
2679                         obd->obd_next_recovery_transno++;
2680                         spin_unlock(&obd->obd_recovery_task_lock);
2681                         target_exp_dequeue_req_replay(req);
2682                         target_request_copy_put(req);
2683                         obd->obd_replayed_requests++;
2684                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2685                         struct distribute_txn_replay_req *dtrq;
2686                         int rc;
2687
2688                         spin_unlock(&obd->obd_recovery_task_lock);
2689
2690                         LASSERT(tdtd != NULL);
2691                         dtrq = distribute_txn_get_next_req(tdtd);
2692                         lu_context_enter(&thread->t_env->le_ctx);
2693                         ptlrpc_watchdog_init(&thread->t_watchdog,
2694                                              WATCHDOG_TIMEOUT);
2695                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2696                         ptlrpc_watchdog_disable(&thread->t_watchdog);
2697                         lu_context_exit(&thread->t_env->le_ctx);
2698                         extend_recovery_timer(obd, obd_timeout, true);
2699
2700                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2701                                 CDEBUG(D_HA,
2702                                        "Move x%llu t%llu to finish list\n",
2703                                        dtrq->dtrq_xid,
2704                                        dtrq->dtrq_master_transno);
2705
2706                                 /* Add it to the replay finish list */
2707                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2708                                 list_add(&dtrq->dtrq_list,
2709                                          &tdtd->tdtd_replay_finish_list);
2710                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2711
2712                                 spin_lock(&obd->obd_recovery_task_lock);
2713                                 if (transno == obd->obd_next_recovery_transno)
2714                                         obd->obd_next_recovery_transno++;
2715                                 else if (transno >
2716                                          obd->obd_next_recovery_transno)
2717                                         obd->obd_next_recovery_transno =
2718                                                                 transno + 1;
2719                                 spin_unlock(&obd->obd_recovery_task_lock);
2720                         } else {
2721                                 dtrq_destroy(dtrq);
2722                         }
2723                 } else {
2724                         spin_unlock(&obd->obd_recovery_task_lock);
2725 abort:
2726                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2727                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2728                         /** evict exports failed VBR */
2729                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2730                         break;
2731                 }
2732         } while (1);
2733 }
2734
2735 static int target_recovery_thread(void *arg)
2736 {
2737         struct lu_target *lut = arg;
2738         struct obd_device *obd = lut->lut_obd;
2739         struct ptlrpc_request *req;
2740         struct target_recovery_data *trd = &obd->obd_recovery_data;
2741         unsigned long delta;
2742         struct lu_env *env;
2743         struct ptlrpc_thread *thread = NULL;
2744         int rc = 0;
2745
2746         ENTRY;
2747         unshare_fs_struct();
2748         OBD_ALLOC_PTR(thread);
2749         if (thread == NULL)
2750                 RETURN(-ENOMEM);
2751
2752         OBD_ALLOC_PTR(env);
2753         if (env == NULL)
2754                 GOTO(out_thread, rc = -ENOMEM);
2755         rc = lu_env_add(env);
2756         if (rc)
2757                 GOTO(out_env, rc);
2758
2759         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2760         if (rc)
2761                 GOTO(out_env_remove, rc);
2762
2763         thread->t_env = env;
2764         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2765         thread->t_task = current;
2766         env->le_ctx.lc_thread = thread;
2767         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2768
2769         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2770                current->pid);
2771         trd->trd_processing_task = current->pid;
2772
2773         spin_lock(&obd->obd_dev_lock);
2774         obd->obd_recovering = 1;
2775         spin_unlock(&obd->obd_dev_lock);
2776         complete(&trd->trd_starting);
2777
2778         /* first of all, we have to know the first transno to replay */
2779         if (target_recovery_overseer(lut, check_for_recovery_ready,
2780                                      exp_connect_healthy)) {
2781                 abort_req_replay_queue(obd);
2782                 abort_lock_replay_queue(obd);
2783                 if (lut->lut_tdtd != NULL)
2784                         dtrq_list_destroy(lut->lut_tdtd);
2785         }
2786
2787         /* next stage: replay requests or update */
2788         delta = jiffies;
2789         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2790                atomic_read(&obd->obd_req_replay_clients),
2791                obd->obd_next_recovery_transno);
2792         replay_request_or_update(env, lut, trd, thread);
2793
2794         /**
2795          * The second stage: replay locks
2796          */
2797         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2798                atomic_read(&obd->obd_lock_replay_clients));
2799         while ((req = target_next_replay_lock(lut))) {
2800                 LASSERT(trd->trd_processing_task == current->pid);
2801                 DEBUG_REQ(D_HA, req, "processing lock from %s:",
2802                           libcfs_nidstr(&req->rq_peer.nid));
2803                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_LOCK_REPLAY)) {
2804                         req->rq_status = -ENODEV;
2805                         target_request_copy_put(req);
2806                         continue;
2807                 }
2808                 handle_recovery_req(thread, req,
2809                                     trd->trd_recovery_handler);
2810                 target_request_copy_put(req);
2811                 obd->obd_replayed_locks++;
2812         }
2813
2814         /**
2815          * The third stage: reply on final pings, at this moment all clients
2816          * must have request in final queue
2817          */
2818         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2819         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2820         /** Update server last boot epoch */
2821         tgt_boot_epoch_update(lut);
2822
2823         /* cancel update llogs upon recovery abort */
2824         if (obd->obd_abort_recovery || obd->obd_abort_mdt_recovery)
2825                 OBP(obd, iocontrol)(OBD_IOC_LLOG_CANCEL, obd->obd_self_export,
2826                                     0, NULL, NULL);
2827
2828         list_for_each_entry(req, &obd->obd_final_req_queue, rq_list) {
2829                 /*
2830                  * Because the waiting client can not send ping to server,
2831                  * so we need refresh the last_request_time, to avoid the
2832                  * export is being evicted
2833                  */
2834                 ptlrpc_update_export_timer(req->rq_export, 0);
2835         }
2836
2837         /*
2838          * We drop recoverying flag to forward all new requests
2839          * to regular mds_handle() since now
2840          */
2841         spin_lock(&obd->obd_dev_lock);
2842         obd->obd_recovering = 0;
2843         obd->obd_abort_recovery = 0;
2844         obd->obd_abort_mdt_recovery = 0;
2845         spin_unlock(&obd->obd_dev_lock);
2846         spin_lock(&obd->obd_recovery_task_lock);
2847         target_cancel_recovery_timer(obd);
2848         spin_unlock(&obd->obd_recovery_task_lock);
2849         while ((req = target_next_final_ping(obd))) {
2850                 LASSERT(trd->trd_processing_task == current->pid);
2851                 DEBUG_REQ(D_HA, req, "processing final ping from %s:",
2852                           libcfs_nidstr(&req->rq_peer.nid));
2853                 handle_recovery_req(thread, req,
2854                                     trd->trd_recovery_handler);
2855                 target_request_copy_put(req);
2856         }
2857
2858         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2859         CDEBUG(D_INFO, "4: recovery completed in %lus - %d/%d reqs/locks\n",
2860                delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2861         if (delta > OBD_RECOVERY_TIME_SOFT) {
2862                 CWARN("too long recovery - read logs\n");
2863                 libcfs_debug_dumplog();
2864         }
2865
2866         target_finish_recovery(lut);
2867         lu_context_fini(&env->le_ctx);
2868         trd->trd_processing_task = 0;
2869         complete_all(&trd->trd_finishing);
2870         tgt_io_thread_done(thread);
2871 out_env_remove:
2872         lu_env_remove(env);
2873 out_env:
2874         OBD_FREE_PTR(env);
2875 out_thread:
2876         OBD_FREE_PTR(thread);
2877         RETURN(rc);
2878 }
2879
2880 static int target_start_recovery_thread(struct lu_target *lut,
2881                                         svc_handler_t handler)
2882 {
2883         struct obd_device *obd = lut->lut_obd;
2884         int rc = 0;
2885         struct target_recovery_data *trd = &obd->obd_recovery_data;
2886         int index;
2887
2888         memset(trd, 0, sizeof(*trd));
2889         init_completion(&trd->trd_starting);
2890         init_completion(&trd->trd_finishing);
2891         trd->trd_recovery_handler = handler;
2892
2893         rc = server_name2index(obd->obd_name, &index, NULL);
2894         if (rc < 0)
2895                 return rc;
2896
2897         if (!IS_ERR(kthread_run(target_recovery_thread,
2898                                 lut, "tgt_recover_%d", index))) {
2899                 wait_for_completion(&trd->trd_starting);
2900                 LASSERT(obd->obd_recovering != 0);
2901         } else {
2902                 rc = -ECHILD;
2903         }
2904
2905         return rc;
2906 }
2907
2908 void target_stop_recovery_thread(struct obd_device *obd)
2909 {
2910         if (obd->obd_recovery_data.trd_processing_task > 0) {
2911                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2912                 /** recovery can be done but postrecovery is not yet */
2913                 spin_lock(&obd->obd_dev_lock);
2914                 if (obd->obd_recovering) {
2915                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2916                         obd->obd_abort_recovery = 1;
2917                         wake_up(&obd->obd_next_transno_waitq);
2918                 }
2919                 spin_unlock(&obd->obd_dev_lock);
2920                 wait_for_completion(&trd->trd_finishing);
2921         }
2922 }
2923 EXPORT_SYMBOL(target_stop_recovery_thread);
2924
2925 void target_recovery_fini(struct obd_device *obd)
2926 {
2927         class_disconnect_exports(obd);
2928         target_stop_recovery_thread(obd);
2929         target_cleanup_recovery(obd);
2930 }
2931 EXPORT_SYMBOL(target_recovery_fini);
2932
2933 static enum hrtimer_restart target_recovery_expired(struct hrtimer *timer)
2934 {
2935         struct obd_device *obd = container_of(timer, struct obd_device,
2936                                               obd_recovery_timer);
2937
2938         CDEBUG(D_HA,
2939                "%s: recovery timed out; %d clients are still in recovery after %llu seconds (%d clients connected)\n",
2940                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2941                ktime_get_seconds() - obd->obd_recovery_start,
2942                atomic_read(&obd->obd_connected_clients));
2943
2944         obd->obd_recovery_expired = 1;
2945         wake_up(&obd->obd_next_transno_waitq);
2946         return HRTIMER_NORESTART;
2947 }
2948
2949 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2950 {
2951         struct obd_device *obd = lut->lut_obd;
2952
2953         if (lut->lut_bottom->dd_rdonly)
2954                 return;
2955
2956         if (atomic_read(&obd->obd_max_recoverable_clients) == 0) {
2957                 /** Update server last boot epoch */
2958                 tgt_boot_epoch_update(lut);
2959                 return;
2960         }
2961
2962         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2963                "last_transno %llu\n", obd->obd_name,
2964                atomic_read(&obd->obd_max_recoverable_clients),
2965                obd->obd_last_committed);
2966         LASSERT(obd->obd_stopping == 0);
2967         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2968         obd->obd_recovery_start = 0;
2969         obd->obd_recovery_end = 0;
2970
2971         hrtimer_init(&obd->obd_recovery_timer, CLOCK_MONOTONIC,
2972                      HRTIMER_MODE_ABS);
2973         obd->obd_recovery_timer.function = &target_recovery_expired;
2974         target_start_recovery_thread(lut, handler);
2975 }
2976 EXPORT_SYMBOL(target_recovery_init);
2977
2978 static int target_process_req_flags(struct obd_device *obd,
2979                                     struct ptlrpc_request *req)
2980 {
2981         struct obd_export *exp = req->rq_export;
2982
2983         LASSERT(exp != NULL);
2984         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2985                 /* client declares he's ready to replay locks */
2986                 spin_lock(&exp->exp_lock);
2987                 if (exp->exp_req_replay_needed) {
2988                         exp->exp_req_replay_needed = 0;
2989                         spin_unlock(&exp->exp_lock);
2990
2991                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2992                         atomic_dec(&obd->obd_req_replay_clients);
2993                 } else {
2994                         spin_unlock(&exp->exp_lock);
2995                 }
2996         }
2997         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2998                 /*
2999                  * client declares he's ready to complete recovery
3000                  * so, we put the request on th final queue
3001                  */
3002                 spin_lock(&exp->exp_lock);
3003                 if (exp->exp_lock_replay_needed) {
3004                         exp->exp_lock_replay_needed = 0;
3005                         spin_unlock(&exp->exp_lock);
3006
3007                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
3008                         atomic_dec(&obd->obd_lock_replay_clients);
3009                 } else {
3010                         spin_unlock(&exp->exp_lock);
3011                 }
3012         }
3013         return 0;
3014 }
3015
3016 int target_queue_recovery_request(struct ptlrpc_request *req,
3017                                   struct obd_device *obd)
3018 {
3019         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
3020         struct ptlrpc_request *reqiter;
3021         int inserted = 0;
3022
3023         ENTRY;
3024
3025         if (obd->obd_recovery_data.trd_processing_task == current->pid) {
3026                 /* Processing the queue right now, don't re-add. */
3027                 RETURN(1);
3028         }
3029
3030         target_process_req_flags(obd, req);
3031
3032         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
3033                 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
3034                         if (cfs_fail_val == 1) {
3035                                 cfs_race_state = 1;
3036                                 cfs_fail_val = 0;
3037                                 wake_up(&cfs_race_waitq);
3038
3039                                 schedule_timeout_interruptible(
3040                                         cfs_time_seconds(1));
3041                         }
3042                 }
3043
3044                 /*
3045                  * client declares he's ready to complete recovery
3046                  * so, we put the request on th final queue
3047                  */
3048                 target_request_copy_get(req);
3049                 DEBUG_REQ(D_HA, req, "queue final req");
3050                 wake_up(&obd->obd_next_transno_waitq);
3051                 spin_lock(&obd->obd_recovery_task_lock);
3052                 if (obd->obd_recovering) {
3053                         struct ptlrpc_request *tmp;
3054                         struct ptlrpc_request *duplicate = NULL;
3055
3056                         if (likely(!req->rq_export->exp_replay_done)) {
3057                                 req->rq_export->exp_replay_done = 1;
3058                                 list_add_tail(&req->rq_list,
3059                                               &obd->obd_final_req_queue);
3060                                 spin_unlock(&obd->obd_recovery_task_lock);
3061                                 RETURN(0);
3062                         }
3063
3064                         /*
3065                          * XXX O(n), but only happens if final ping is
3066                          * timed out, probably reorganize the list as
3067                          * a hash list later
3068                          */
3069                         list_for_each_entry_safe(reqiter, tmp,
3070                                                  &obd->obd_final_req_queue,
3071                                                  rq_list) {
3072                                 if (reqiter->rq_export == req->rq_export) {
3073                                         list_del_init(&reqiter->rq_list);
3074                                         duplicate = reqiter;
3075                                         break;
3076                                 }
3077                         }
3078
3079                         list_add_tail(&req->rq_list,
3080                                       &obd->obd_final_req_queue);
3081                         req->rq_export->exp_replay_done = 1;
3082                         spin_unlock(&obd->obd_recovery_task_lock);
3083
3084                         if (duplicate != NULL) {
3085                                 DEBUG_REQ(D_HA, duplicate,
3086                                           "put prev final req");
3087                                 target_request_copy_put(duplicate);
3088                         }
3089                         RETURN(0);
3090                 } else {
3091                         spin_unlock(&obd->obd_recovery_task_lock);
3092                         target_request_copy_put(req);
3093                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
3094                 }
3095         }
3096         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
3097                 /* client declares he's ready to replay locks */
3098                 target_request_copy_get(req);
3099                 DEBUG_REQ(D_HA, req, "queue lock replay req");
3100                 wake_up(&obd->obd_next_transno_waitq);
3101                 spin_lock(&obd->obd_recovery_task_lock);
3102                 LASSERT(obd->obd_recovering);
3103                 /* usually due to recovery abort */
3104                 if (!req->rq_export->exp_in_recovery) {
3105                         spin_unlock(&obd->obd_recovery_task_lock);
3106                         target_request_copy_put(req);
3107                         RETURN(-ENOTCONN);
3108                 }
3109                 LASSERT(req->rq_export->exp_lock_replay_needed);
3110                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
3111                 spin_unlock(&obd->obd_recovery_task_lock);
3112                 RETURN(0);
3113         }
3114
3115         /*
3116          * CAVEAT EMPTOR: The incoming request message has been swabbed
3117          * (i.e. buflens etc are in my own byte order), but type-dependent
3118          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed.
3119          */
3120
3121         if (!transno) {
3122                 INIT_LIST_HEAD(&req->rq_list);
3123                 DEBUG_REQ(D_HA, req, "not queueing");
3124                 RETURN(1);
3125         }
3126
3127         /*
3128          * If we're processing the queue, we want don't want to queue this
3129          * message.
3130          *
3131          * Also, if this request has a transno less than the one we're waiting
3132          * for, we should process it now.  It could (and currently always will)
3133          * be an open request for a descriptor that was opened some time ago.
3134          *
3135          * Also, a resent, replayed request that has already been
3136          * handled will pass through here and be processed immediately.
3137          */
3138         CDEBUG(D_HA,
3139                "Next recovery transno: %llu, current: %llu, replaying\n",
3140                obd->obd_next_recovery_transno, transno);
3141
3142         /*
3143          * If the request has been replayed by update replay, then sends this
3144          * request to the recovery thread (replay_request_or_update()), where
3145          * it will be handled
3146          */
3147         spin_lock(&obd->obd_recovery_task_lock);
3148         if (transno < obd->obd_next_recovery_transno &&
3149             !is_req_replayed_by_update(req)) {
3150                 /* Processing the queue right now, don't re-add. */
3151                 LASSERT(list_empty(&req->rq_list));
3152                 spin_unlock(&obd->obd_recovery_task_lock);
3153                 RETURN(1);
3154         }
3155         spin_unlock(&obd->obd_recovery_task_lock);
3156
3157         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
3158                 RETURN(0);
3159
3160         target_request_copy_get(req);
3161         if (!req->rq_export->exp_in_recovery) {
3162                 target_request_copy_put(req);
3163                 RETURN(-ENOTCONN);
3164         }
3165         LASSERT(req->rq_export->exp_req_replay_needed);
3166
3167         if (target_exp_enqueue_req_replay(req)) {
3168                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
3169                 target_request_copy_put(req);
3170                 RETURN(0);
3171         }
3172
3173         /* XXX O(n^2) */
3174         spin_lock(&obd->obd_recovery_task_lock);
3175         LASSERT(obd->obd_recovering);
3176         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
3177                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
3178                         list_add_tail(&req->rq_list, &reqiter->rq_list);
3179                         inserted = 1;
3180                         goto added;
3181                 }
3182
3183                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
3184                              transno)) {
3185                         DEBUG_REQ(D_ERROR, req,
3186                                   "dropping replay: transno has been claimed by another client");
3187                         spin_unlock(&obd->obd_recovery_task_lock);
3188                         target_exp_dequeue_req_replay(req);
3189                         target_request_copy_put(req);
3190                         RETURN(0);
3191                 }
3192         }
3193 added:
3194         if (!inserted)
3195                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
3196
3197         obd->obd_requests_queued_for_recovery++;
3198         spin_unlock(&obd->obd_recovery_task_lock);
3199         wake_up(&obd->obd_next_transno_waitq);
3200         RETURN(0);
3201 }
3202
3203 void target_committed_to_req(struct ptlrpc_request *req)
3204 {
3205         struct obd_export *exp = req->rq_export;
3206
3207         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
3208                 lustre_msg_set_last_committed(req->rq_repmsg,
3209                                               exp->exp_last_committed);
3210         else
3211                 DEBUG_REQ(D_IOCTL, req,
3212                           "not sending last_committed update (%d/%d)",
3213                           exp->exp_obd->obd_no_transno,
3214                           req->rq_repmsg == NULL);
3215
3216         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
3217                exp->exp_last_committed, req->rq_transno, req->rq_xid);
3218 }
3219
3220 #endif /* HAVE_SERVER_SUPPORT */
3221
3222 /**
3223  * Packs current SLV and Limit into \a req.
3224  */
3225 int target_pack_pool_reply(struct ptlrpc_request *req)
3226 {
3227         struct obd_device *obd;
3228
3229         ENTRY;
3230
3231         /*
3232          * Check that we still have all structures alive as this may
3233          * be some late RPC at shutdown time.
3234          */
3235         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
3236                      !exp_connect_lru_resize(req->rq_export))) {
3237                 lustre_msg_set_slv(req->rq_repmsg, 0);
3238                 lustre_msg_set_limit(req->rq_repmsg, 0);
3239                 RETURN(0);
3240         }
3241
3242         /* OBD is alive here as export is alive, which we checked above. */
3243         obd = req->rq_export->exp_obd;
3244
3245         read_lock(&obd->obd_pool_lock);
3246         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
3247         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
3248         read_unlock(&obd->obd_pool_lock);
3249
3250         RETURN(0);
3251 }
3252
3253 static int target_send_reply_msg(struct ptlrpc_request *req,
3254                                  int rc, int fail_id)
3255 {
3256         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
3257                 DEBUG_REQ(D_ERROR, req, "dropping reply");
3258                 return -ECOMM;
3259         }
3260         /*
3261          * We can have a null rq_reqmsg in the event of bad signature or
3262          * no context when unwrapping
3263          */
3264         if (req->rq_reqmsg &&
3265             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
3266             OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
3267                 return -ECOMM;
3268
3269         if (unlikely(rc)) {
3270                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
3271                 req->rq_status = rc;
3272                 return ptlrpc_send_error(req, 1);
3273         }
3274         DEBUG_REQ(D_NET, req, "sending reply");
3275
3276         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
3277 }
3278
3279 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
3280 {
3281         struct ptlrpc_service_part *svcpt;
3282         int netrc;
3283         struct ptlrpc_reply_state *rs;
3284         struct obd_export *exp;
3285
3286         ENTRY;
3287
3288         if (req->rq_no_reply) {
3289                 EXIT;
3290                 return;
3291         }
3292
3293         svcpt = req->rq_rqbd->rqbd_svcpt;
3294         rs = req->rq_reply_state;
3295         if (rs == NULL || !rs->rs_difficult) {
3296                 /* no notifiers */
3297                 target_send_reply_msg(req, rc, fail_id);
3298                 EXIT;
3299                 return;
3300         }
3301
3302         /* must be an export if locks saved */
3303         LASSERT(req->rq_export != NULL);
3304         /* req/reply consistent */
3305         LASSERT(rs->rs_svcpt == svcpt);
3306
3307         /* "fresh" reply */
3308         LASSERT(!rs->rs_scheduled);
3309         LASSERT(!rs->rs_scheduled_ever);
3310         LASSERT(!rs->rs_handled);
3311         LASSERT(!rs->rs_sent);
3312         LASSERT(!rs->rs_unlinked);
3313         LASSERT(rs->rs_export == NULL);
3314         LASSERT(list_empty(&rs->rs_obd_list));
3315         LASSERT(list_empty(&rs->rs_exp_list));
3316
3317         exp = class_export_get(req->rq_export);
3318
3319         /* disable reply scheduling while I'm setting up */
3320         rs->rs_scheduled = 1;
3321         rs->rs_sent      = 0;
3322         rs->rs_unlinked  = 0;
3323         rs->rs_xid       = req->rq_xid;
3324         rs->rs_transno   = req->rq_transno;
3325         rs->rs_export    = exp;
3326         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
3327
3328         spin_lock(&exp->exp_uncommitted_replies_lock);
3329         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
3330                rs->rs_transno, exp->exp_last_committed);
3331         if (rs->rs_transno > exp->exp_last_committed) {
3332                 /* not committed already */
3333                 list_add_tail(&rs->rs_obd_list,
3334                                   &exp->exp_uncommitted_replies);
3335         }
3336         spin_unlock(&exp->exp_uncommitted_replies_lock);
3337
3338         spin_lock(&exp->exp_lock);
3339         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
3340         spin_unlock(&exp->exp_lock);
3341
3342         netrc = target_send_reply_msg(req, rc, fail_id);
3343
3344         spin_lock(&svcpt->scp_rep_lock);
3345
3346         atomic_inc(&svcpt->scp_nreps_difficult);
3347
3348         if (netrc != 0) {
3349                 /*
3350                  * error sending: reply is off the net.  Also we need +1
3351                  * reply ref until ptlrpc_handle_rs() is done
3352                  * with the reply state (if the send was successful, there
3353                  * would have been +1 ref for the net, which
3354                  * reply_out_callback leaves alone)
3355                  */
3356                 rs->rs_sent = 1;
3357                 rs->rs_unlinked = 1;
3358                 ptlrpc_rs_addref(rs);
3359         }
3360
3361         spin_lock(&rs->rs_lock);
3362         if (rs->rs_transno <= exp->exp_last_committed ||
3363             (rs->rs_unlinked && !rs->rs_no_ack) ||
3364             list_empty(&rs->rs_exp_list) ||     /* completed already */
3365             list_empty(&rs->rs_obd_list)) {
3366                 CDEBUG(D_HA, "Schedule reply immediately\n");
3367                 ptlrpc_dispatch_difficult_reply(rs);
3368         } else {
3369                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
3370                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
3371         }
3372         spin_unlock(&rs->rs_lock);
3373         spin_unlock(&svcpt->scp_rep_lock);
3374         EXIT;
3375 }
3376
3377 enum ldlm_mode lck_compat_array[] = {
3378         [LCK_EX]    = LCK_COMPAT_EX,
3379         [LCK_PW]    = LCK_COMPAT_PW,
3380         [LCK_PR]    = LCK_COMPAT_PR,
3381         [LCK_CW]    = LCK_COMPAT_CW,
3382         [LCK_CR]    = LCK_COMPAT_CR,
3383         [LCK_NL]    = LCK_COMPAT_NL,
3384         [LCK_GROUP] = LCK_COMPAT_GROUP,
3385         [LCK_COS]   = LCK_COMPAT_COS,
3386 };
3387
3388 /**
3389  * Rather arbitrary mapping from LDLM error codes to errno values. This should
3390  * not escape to the user level.
3391  */
3392 int ldlm_error2errno(enum ldlm_error error)
3393 {
3394         int result;
3395
3396         switch (error) {
3397         case ELDLM_OK:
3398         case ELDLM_LOCK_MATCHED:
3399                 result = 0;
3400                 break;
3401         case ELDLM_LOCK_CHANGED:
3402                 result = -ESTALE;
3403                 break;
3404         case ELDLM_LOCK_ABORTED:
3405                 result = -ENAVAIL;
3406                 break;
3407         case ELDLM_LOCK_REPLACED:
3408                 result = -ESRCH;
3409                 break;
3410         case ELDLM_NO_LOCK_DATA:
3411                 result = -ENOENT;
3412                 break;
3413         case ELDLM_NAMESPACE_EXISTS:
3414                 result = -EEXIST;
3415                 break;
3416         case ELDLM_BAD_NAMESPACE:
3417                 result = -EBADF;
3418                 break;
3419         default:
3420                 if (((int)error) < 0) { /* cast to signed type */
3421                         result = error; /* as ldlm_error can be unsigned */
3422                 } else {
3423                         CERROR("Invalid DLM result code: %d\n", error);
3424                         result = -EPROTO;
3425                 }
3426         }
3427         return result;
3428 }
3429 EXPORT_SYMBOL(ldlm_error2errno);
3430
3431 /**
3432  * Dual to ldlm_error2errno(): maps errno values back to enum ldlm_error.
3433  */
3434 enum ldlm_error ldlm_errno2error(int err_no)
3435 {
3436         int error;
3437
3438         switch (err_no) {
3439         case 0:
3440                 error = ELDLM_OK;
3441                 break;
3442         case -ESTALE:
3443                 error = ELDLM_LOCK_CHANGED;
3444                 break;
3445         case -ENAVAIL:
3446                 error = ELDLM_LOCK_ABORTED;
3447                 break;
3448         case -ESRCH:
3449                 error = ELDLM_LOCK_REPLACED;
3450                 break;
3451         case -ENOENT:
3452                 error = ELDLM_NO_LOCK_DATA;
3453                 break;
3454         case -EEXIST:
3455                 error = ELDLM_NAMESPACE_EXISTS;
3456                 break;
3457         case -EBADF:
3458                 error = ELDLM_BAD_NAMESPACE;
3459                 break;
3460         default:
3461                 error = err_no;
3462         }
3463         return error;
3464 }
3465
3466 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3467 void ldlm_dump_export_locks(struct obd_export *exp)
3468 {
3469         spin_lock(&exp->exp_locks_list_guard);
3470         if (!list_empty(&exp->exp_locks_list)) {
3471                 struct ldlm_lock *lock;
3472
3473                 CERROR("dumping locks for export %p, ignore if the unmount doesn't hang\n",
3474                        exp);
3475                 list_for_each_entry(lock, &exp->exp_locks_list,
3476                                         l_exp_refs_link)
3477                         LDLM_ERROR(lock, "lock:");
3478         }
3479         spin_unlock(&exp->exp_locks_list_guard);
3480 }
3481 #endif
3482
3483 #ifdef HAVE_SERVER_SUPPORT
3484 static inline const char *bulk2type(struct ptlrpc_request *req)
3485 {
3486         if (req->rq_bulk_read)
3487                 return "READ";
3488         if (req->rq_bulk_write)
3489                 return "WRITE";
3490         return "UNKNOWN";
3491 }
3492
3493 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc)
3494 {
3495         struct ptlrpc_request *req = desc->bd_req;
3496         time64_t start = ktime_get_seconds();
3497         time64_t deadline;
3498         int rc = 0;
3499
3500         ENTRY;
3501
3502         /* If there is eviction in progress, wait for it to finish. */
3503         wait_event_idle(
3504                 exp->exp_obd->obd_evict_inprogress_waitq,
3505                 !atomic_read(&exp->exp_obd->obd_evict_inprogress));
3506
3507         /* Check if client was evicted or reconnected already. */
3508         if (exp->exp_failed ||
3509             exp->exp_conn_cnt > lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3510                 rc = -ENOTCONN;
3511         } else {
3512                 if (req->rq_bulk_read)
3513                         rc = sptlrpc_svc_wrap_bulk(req, desc);
3514
3515                 if (OCD_HAS_FLAG(&exp->exp_connect_data, BULK_MBITS))
3516                         req->rq_mbits = lustre_msg_get_mbits(req->rq_reqmsg);
3517                 else /* old version, bulk matchbits is rq_xid */
3518                         req->rq_mbits = req->rq_xid;
3519
3520                 if (rc == 0)
3521                         rc = ptlrpc_start_bulk_transfer(desc);
3522         }
3523
3524         if (rc < 0) {
3525                 DEBUG_REQ(D_ERROR, req, "bulk %s failed: rc = %d",
3526                           bulk2type(req), rc);
3527                 RETURN(rc);
3528         }
3529
3530         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
3531                 ptlrpc_abort_bulk(desc);
3532                 RETURN(0);
3533         }
3534
3535         /* limit actual bulk transfer to bulk_timeout seconds */
3536         deadline = start + bulk_timeout;
3537         if (deadline > req->rq_deadline)
3538                 deadline = req->rq_deadline;
3539
3540         do {
3541                 time64_t timeoutl = deadline - ktime_get_seconds();
3542                 time64_t rq_deadline;
3543
3544                 while (timeoutl >= 0 &&
3545                        wait_event_idle_timeout(
3546                                desc->bd_waitq,
3547                                !ptlrpc_server_bulk_active(desc) ||
3548                                exp->exp_failed ||
3549                                exp->exp_conn_cnt >
3550                                lustre_msg_get_conn_cnt(req->rq_reqmsg),
3551                                timeoutl ? cfs_time_seconds(1) : 1) == 0)
3552                         timeoutl -= 1;
3553                 rc = timeoutl < 0 ? -ETIMEDOUT : 0;
3554
3555                 /* Wait again if we changed rq_deadline. */
3556                 rq_deadline = READ_ONCE(req->rq_deadline);
3557                 deadline = start + bulk_timeout;
3558                 if (deadline > rq_deadline)
3559                         deadline = rq_deadline;
3560         } while (rc == -ETIMEDOUT &&
3561                  deadline > ktime_get_seconds());
3562
3563         if (rc == -ETIMEDOUT) {
3564                 DEBUG_REQ(D_ERROR, req, "timeout on bulk %s after %lld%+llds",
3565                           bulk2type(req), deadline - start,
3566                           ktime_get_real_seconds() - deadline);
3567                 ptlrpc_abort_bulk(desc);
3568         } else if (exp->exp_failed) {
3569                 DEBUG_REQ(D_ERROR, req, "Eviction on bulk %s",
3570                           bulk2type(req));
3571                 rc = -ENOTCONN;
3572                 ptlrpc_abort_bulk(desc);
3573         } else if (exp->exp_conn_cnt >
3574                    lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3575                 DEBUG_REQ(D_ERROR, req, "Reconnect on bulk %s",
3576                           bulk2type(req));
3577                 /* We don't reply anyway. */
3578                 rc = -ETIMEDOUT;
3579                 ptlrpc_abort_bulk(desc);
3580         } else if (desc->bd_failure) {
3581                 DEBUG_REQ(D_ERROR, req, "network error on bulk %s",
3582                           bulk2type(req));
3583                 /* XXX should this be a different errno? */
3584                 rc = -ETIMEDOUT;
3585         } else {
3586                 if (req->rq_bulk_write)
3587                         rc = sptlrpc_svc_unwrap_bulk(req, desc);
3588                 if (rc == 0 && desc->bd_nob_transferred != desc->bd_nob) {
3589                         DEBUG_REQ(D_ERROR, req, "truncated bulk %s %d(%d)",
3590                                   bulk2type(req), desc->bd_nob_transferred,
3591                                   desc->bd_nob);
3592                         /* XXX should this be a different errno? */
3593                         rc = -ETIMEDOUT;
3594                 }
3595         }
3596
3597         RETURN(rc);
3598 }
3599 EXPORT_SYMBOL(target_bulk_io);
3600
3601 #endif /* HAVE_SERVER_SUPPORT */