lustre/ldlm/ldlm_lib.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2010, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  */
  31
  32 /**
  33  * This file deals with various client/target related logic including recovery.
  34  *
  35  * TODO: This code more logically belongs in the ptlrpc module than in ldlm and
  36  * should be moved.
  37  */
  38
  39 #define DEBUG_SUBSYSTEM S_LDLM
  40
  41 #include <cl_object.h>
  42 #include <linux/fs_struct.h>
  43 #include <linux/jiffies.h>
  44 #include <linux/kernel.h>
  45 #include <linux/kthread.h>
  46 #include <libcfs/libcfs.h>
  47 #include <obd.h>
  48 #include <obd_class.h>
  49 #include <lustre_dlm.h>
  50 #include <lustre_net.h>
  51 #include <lustre_sec.h>
  52 #include "ldlm_internal.h"
  53
  54 /*
  55  * @priority: If non-zero, move the selected connection to the list head.
  56  * @create: If zero, only search in existing connections.
  57  */
  58 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  59                            int priority, int create)
  60 {
  61         struct ptlrpc_connection *ptlrpc_conn;
  62         struct obd_import_conn *imp_conn = NULL, *item;
  63         u32 refnet = LNET_NET_ANY;
  64         int rc = 0;
  65
  66         ENTRY;
  67
  68         if (!create && !priority) {
  69                 CDEBUG(D_HA, "Nothing to do\n");
  70                 RETURN(-EINVAL);
  71         }
  72
  73         if (imp->imp_connection &&
  74             imp->imp_connection->c_remote_uuid.uuid[0] == 0)
  75                 /* refnet is used to restrict network connections */
  76                 refnet = LNET_NID_NET(&imp->imp_connection->c_self);
  77         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, refnet);
  78         if (!ptlrpc_conn) {
  79                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  80                 RETURN(-ENOENT);
  81         }
  82
  83         if (create) {
  84                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  85                 if (!imp_conn)
  86                         GOTO(out_put, rc = -ENOMEM);
  87         }
  88
  89         spin_lock(&imp->imp_lock);
  90         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  91                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  92                         if (priority) {
  93                                 list_move(&item->oic_item,
  94                                           &imp->imp_conn_list);
  95                                 item->oic_last_attempt = 0;
  96                         }
  97                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  98                                imp, imp->imp_obd->obd_name, uuid->uuid,
  99                                (priority ? ", moved to head" : ""));
 100                         spin_unlock(&imp->imp_lock);
 101                         GOTO(out_free, rc = 0);
 102                 }
 103         }
 104         /* No existing import connection found for \a uuid. */
 105         if (create) {
 106                 imp_conn->oic_conn = ptlrpc_conn;
 107                 imp_conn->oic_uuid = *uuid;
 108                 imp_conn->oic_last_attempt = 0;
 109                 if (priority)
 110                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 111                 else
 112                         list_add_tail(&imp_conn->oic_item,
 113                                       &imp->imp_conn_list);
 114                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 115                        imp, imp->imp_obd->obd_name, uuid->uuid,
 116                        (priority ? "head" : "tail"));
 117         } else {
 118                 spin_unlock(&imp->imp_lock);
 119                 GOTO(out_free, rc = -ENOENT);
 120         }
 121
 122         spin_unlock(&imp->imp_lock);
 123         RETURN(0);
 124 out_free:
 125         if (imp_conn)
 126                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 127 out_put:
 128         ptlrpc_connection_put(ptlrpc_conn);
 129         RETURN(rc);
 130 }
 131
 132 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 133 {
 134         return import_set_conn(imp, uuid, 1, 0);
 135 }
 136
 137 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 138                            int priority)
 139 {
 140         return import_set_conn(imp, uuid, priority, 1);
 141 }
 142 EXPORT_SYMBOL(client_import_add_conn);
 143
 144 int client_import_dyn_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 145                                lnet_nid_t prim_nid, int priority)
 146 {
 147         struct ptlrpc_connection *ptlrpc_conn;
 148         int rc;
 149
 150         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, LNET_NIDNET(prim_nid));
 151         if (!ptlrpc_conn) {
 152                 const char *str_uuid = obd_uuid2str(uuid);
 153
 154                 rc = class_add_uuid(str_uuid, prim_nid);
 155                 if (rc) {
 156                         CERROR("%s: failed to add UUID '%s': rc = %d\n",
 157                                imp->imp_obd->obd_name, str_uuid, rc);
 158                         return rc;
 159                 }
 160         }
 161         return import_set_conn(imp, uuid, priority, 1);
 162 }
 163 EXPORT_SYMBOL(client_import_dyn_add_conn);
 164
 165 int client_import_add_nids_to_conn(struct obd_import *imp, lnet_nid_t *nids,
 166                                    int nid_count, struct obd_uuid *uuid)
 167 {
 168         struct obd_import_conn *conn;
 169         int rc = -ENOENT;
 170
 171         ENTRY;
 172         if (nid_count <= 0 || !nids)
 173                 return rc;
 174
 175         spin_lock(&imp->imp_lock);
 176         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 177                 if (class_check_uuid(&conn->oic_uuid, nids[0])) {
 178                         *uuid = conn->oic_uuid;
 179                         spin_unlock(&imp->imp_lock);
 180                         rc = class_add_nids_to_uuid(&conn->oic_uuid, nids,
 181                                                     nid_count);
 182                         RETURN(rc);
 183                 }
 184         }
 185         spin_unlock(&imp->imp_lock);
 186         RETURN(rc);
 187 }
 188 EXPORT_SYMBOL(client_import_add_nids_to_conn);
 189
 190 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 191 {
 192         struct obd_import_conn *imp_conn;
 193         struct obd_export *dlmexp;
 194         int rc = -ENOENT;
 195
 196         ENTRY;
 197
 198         spin_lock(&imp->imp_lock);
 199         if (list_empty(&imp->imp_conn_list)) {
 200                 LASSERT(!imp->imp_connection);
 201                 GOTO(out, rc);
 202         }
 203
 204         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 205                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 206                         continue;
 207                 LASSERT(imp_conn->oic_conn);
 208
 209                 if (imp_conn == imp->imp_conn_current) {
 210                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 211
 212                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 213                             imp->imp_state != LUSTRE_IMP_DISCON) {
 214                                 CERROR("can't remove current connection\n");
 215                                 GOTO(out, rc = -EBUSY);
 216                         }
 217
 218                         ptlrpc_connection_put(imp->imp_connection);
 219                         imp->imp_connection = NULL;
 220
 221                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 222                         if (dlmexp && dlmexp->exp_connection) {
 223                                 LASSERT(dlmexp->exp_connection ==
 224                                         imp_conn->oic_conn);
 225                                 ptlrpc_connection_put(dlmexp->exp_connection);
 226                                 dlmexp->exp_connection = NULL;
 227                         }
 228
 229                         if (dlmexp != NULL)
 230                                 class_export_put(dlmexp);
 231                 }
 232
 233                 list_del(&imp_conn->oic_item);
 234                 ptlrpc_connection_put(imp_conn->oic_conn);
 235                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 236                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 237                        imp, imp->imp_obd->obd_name, uuid->uuid);
 238                 rc = 0;
 239                 break;
 240         }
 241 out:
 242         spin_unlock(&imp->imp_lock);
 243         if (rc == -ENOENT)
 244                 CERROR("connection %s not found\n", uuid->uuid);
 245         RETURN(rc);
 246 }
 247 EXPORT_SYMBOL(client_import_del_conn);
 248
 249 /**
 250  * Find conn UUID by peer NID. \a peer is a server NID. This function is used
 251  * to find a conn uuid of \a imp which can reach \a peer.
 252  */
 253 int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
 254                             struct obd_uuid *uuid)
 255 {
 256         struct obd_import_conn *conn;
 257         int rc = -ENOENT;
 258
 259         ENTRY;
 260
 261         spin_lock(&imp->imp_lock);
 262         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 263                 /* Check if conn UUID does have this peer NID. */
 264                 if (class_check_uuid(&conn->oic_uuid, peer)) {
 265                         *uuid = conn->oic_uuid;
 266                         rc = 0;
 267                         break;
 268                 }
 269         }
 270         spin_unlock(&imp->imp_lock);
 271         RETURN(rc);
 272 }
 273 EXPORT_SYMBOL(client_import_find_conn);
 274
 275 void client_destroy_import(struct obd_import *imp)
 276 {
 277         /*
 278          * Drop security policy instance after all RPCs have finished/aborted
 279          * to let all busy contexts be released.
 280          */
 281         class_import_get(imp);
 282         class_destroy_import(imp);
 283         sptlrpc_import_sec_put(imp);
 284         class_import_put(imp);
 285 }
 286 EXPORT_SYMBOL(client_destroy_import);
 287
 288 /**
 289  * Check whether or not the OSC is on MDT.
 290  * In the config log,
 291  * osc on MDT
 292  *      setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
 293  * osc on client
 294  *      setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
 295  *
 296  **/
 297 static int osc_on_mdt(char *obdname)
 298 {
 299         char *ptr;
 300
 301         ptr = strrchr(obdname, '-');
 302         if (ptr == NULL)
 303                 return 0;
 304
 305         if (strncmp(ptr + 1, "MDT", 3) == 0)
 306                 return 1;
 307
 308         return 0;
 309 }
 310
 311 /*
 312  * Configure an RPC client OBD device.
 313  *
 314  * lcfg parameters:
 315  * 1 - client UUID
 316  * 2 - server UUID
 317  * 3 - inactive-on-startup
 318  * 4 - restrictive net
 319  */
 320 int client_obd_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 321 {
 322         struct client_obd *cli = &obd->u.cli;
 323         struct obd_import *imp;
 324         struct obd_uuid server_uuid;
 325         int rq_portal, rp_portal, connect_op;
 326         const char *name = obd->obd_type->typ_name;
 327         enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
 328         char *cli_name = lustre_cfg_buf(lcfg, 0);
 329         struct ptlrpc_connection fake_conn = { .c_self = {},
 330                                                .c_remote_uuid.uuid[0] = 0 };
 331         int rc;
 332
 333         ENTRY;
 334
 335         /*
 336          * In a more perfect world, we would hang a ptlrpc_client off of
 337          * obd_type and just use the values from there.
 338          */
 339         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 340                 rq_portal = OST_REQUEST_PORTAL;
 341                 rp_portal = OSC_REPLY_PORTAL;
 342                 connect_op = OST_CONNECT;
 343                 cli->cl_sp_me = LUSTRE_SP_CLI;
 344                 cli->cl_sp_to = LUSTRE_SP_OST;
 345                 ns_type = LDLM_NS_TYPE_OSC;
 346         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
 347                    !strcmp(name, LUSTRE_LWP_NAME)) {
 348                 rq_portal = MDS_REQUEST_PORTAL;
 349                 rp_portal = MDC_REPLY_PORTAL;
 350                 connect_op = MDS_CONNECT;
 351                 if (is_lwp_on_ost(cli_name))
 352                         cli->cl_sp_me = LUSTRE_SP_OST;
 353                 else if (is_lwp_on_mdt(cli_name))
 354                         cli->cl_sp_me = LUSTRE_SP_MDT;
 355                 else
 356                         cli->cl_sp_me = LUSTRE_SP_CLI;
 357                 cli->cl_sp_to = LUSTRE_SP_MDT;
 358                 ns_type = LDLM_NS_TYPE_MDC;
 359         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
 360                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
 361                         /* OSP_on_MDT for other MDTs */
 362                         connect_op = MDS_CONNECT;
 363                         cli->cl_sp_to = LUSTRE_SP_MDT;
 364                         ns_type = LDLM_NS_TYPE_MDC;
 365                         rq_portal = OUT_PORTAL;
 366                 } else {
 367                         /* OSP on MDT for OST */
 368                         connect_op = OST_CONNECT;
 369                         cli->cl_sp_to = LUSTRE_SP_OST;
 370                         ns_type = LDLM_NS_TYPE_OSC;
 371                         rq_portal = OST_REQUEST_PORTAL;
 372                 }
 373                 rp_portal = OSC_REPLY_PORTAL;
 374                 cli->cl_sp_me = LUSTRE_SP_MDT;
 375         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 376                 rq_portal = MGS_REQUEST_PORTAL;
 377                 rp_portal = MGC_REPLY_PORTAL;
 378                 connect_op = MGS_CONNECT;
 379                 cli->cl_sp_me = LUSTRE_SP_MGC;
 380                 cli->cl_sp_to = LUSTRE_SP_MGS;
 381                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 382                 ns_type = LDLM_NS_TYPE_MGC;
 383         } else {
 384                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 385                        name);
 386                 RETURN(-EINVAL);
 387         }
 388
 389         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 390                 CERROR("requires a TARGET UUID\n");
 391                 RETURN(-EINVAL);
 392         }
 393
 394         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 395                 CERROR("client UUID must be less than 38 characters\n");
 396                 RETURN(-EINVAL);
 397         }
 398
 399         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 400                 CERROR("setup requires a SERVER UUID\n");
 401                 RETURN(-EINVAL);
 402         }
 403
 404         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 405                 CERROR("target UUID must be less than 38 characters\n");
 406                 RETURN(-EINVAL);
 407         }
 408
 409         init_rwsem(&cli->cl_sem);
 410         mutex_init(&cli->cl_mgc_mutex);
 411         cli->cl_seq = NULL;
 412         init_rwsem(&cli->cl_seq_rwsem);
 413         cli->cl_conn_count = 0;
 414         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 415                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 416                      sizeof(server_uuid)));
 417
 418         cli->cl_dirty_pages = 0;
 419         cli->cl_dirty_max_pages = 0;
 420         cli->cl_avail_grant = 0;
 421         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
 422         /*
 423          * cl_dirty_max_pages may be changed at connect time in
 424          * ptlrpc_connect_interpret().
 425          */
 426         client_adjust_max_dirty(cli);
 427         init_waitqueue_head(&cli->cl_cache_waiters);
 428         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 429         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 430         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 431         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 432         spin_lock_init(&cli->cl_loi_list_lock);
 433         atomic_set(&cli->cl_pending_w_pages, 0);
 434         atomic_set(&cli->cl_pending_r_pages, 0);
 435         cli->cl_r_in_flight = 0;
 436         cli->cl_w_in_flight = 0;
 437
 438         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 439         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 440         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 441         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 442         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 443         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 444
 445         /* lru for osc. */
 446         INIT_LIST_HEAD(&cli->cl_lru_osc);
 447         atomic_set(&cli->cl_lru_shrinkers, 0);
 448         atomic_long_set(&cli->cl_lru_busy, 0);
 449         atomic_long_set(&cli->cl_lru_in_list, 0);
 450         INIT_LIST_HEAD(&cli->cl_lru_list);
 451         spin_lock_init(&cli->cl_lru_list_lock);
 452         atomic_long_set(&cli->cl_unstable_count, 0);
 453         INIT_LIST_HEAD(&cli->cl_shrink_list);
 454         INIT_LIST_HEAD(&cli->cl_grant_chain);
 455
 456         INIT_LIST_HEAD(&cli->cl_flight_waiters);
 457         cli->cl_rpcs_in_flight = 0;
 458
 459         init_waitqueue_head(&cli->cl_destroy_waitq);
 460         atomic_set(&cli->cl_destroy_in_flight, 0);
 461
 462
 463         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 464         cli->cl_preferred_cksum_type = 0;
 465 #ifdef ENABLE_CHECKSUM
 466         /* Turn on checksumming by default. */
 467         cli->cl_checksum = 1;
 468         /*
 469          * The supported checksum types will be worked out at connect time
 470          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 471          * through procfs.
 472          */
 473         cli->cl_cksum_type = cli->cl_supp_cksum_types;
 474 #endif
 475         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 476
 477         /*
 478          * Set it to possible maximum size. It may be reduced by ocd_brw_size
 479          * from OFD after connecting.
 480          */
 481         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 482
 483         cli->cl_max_short_io_bytes = OBD_DEF_SHORT_IO_BYTES;
 484
 485         /*
 486          * set cl_chunkbits default value to PAGE_SHIFT,
 487          * it will be updated at OSC connection time.
 488          */
 489         cli->cl_chunkbits = PAGE_SHIFT;
 490
 491         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 492                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 493         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
 494                 cli->cl_max_rpcs_in_flight = 2;
 495         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
 496                 cli->cl_max_rpcs_in_flight = 3;
 497         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
 498                 cli->cl_max_rpcs_in_flight = 4;
 499         } else {
 500                 if (osc_on_mdt(obd->obd_name))
 501                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
 502                 else
 503                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 504         }
 505
 506         spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
 507         cli->cl_max_mod_rpcs_in_flight = 0;
 508         cli->cl_mod_rpcs_in_flight = 0;
 509         cli->cl_close_rpcs_in_flight = 0;
 510         init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
 511         cli->cl_mod_tag_bitmap = NULL;
 512
 513         INIT_LIST_HEAD(&cli->cl_chg_dev_linkage);
 514
 515         if (connect_op == MDS_CONNECT) {
 516                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
 517                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
 518                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 519                 if (cli->cl_mod_tag_bitmap == NULL)
 520                         GOTO(err, rc = -ENOMEM);
 521         }
 522
 523         rc = ldlm_get_ref();
 524         if (rc) {
 525                 CERROR("ldlm_get_ref failed: %d\n", rc);
 526                 GOTO(err, rc);
 527         }
 528
 529         ptlrpc_init_client(rq_portal, rp_portal, name,
 530                            &obd->obd_ldlm_client);
 531
 532         imp = class_new_import(obd);
 533         if (imp == NULL)
 534                 GOTO(err_ldlm, rc = -ENOENT);
 535         imp->imp_client = &obd->obd_ldlm_client;
 536         imp->imp_connect_op = connect_op;
 537         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 538                LUSTRE_CFG_BUFLEN(lcfg, 1));
 539         class_import_put(imp);
 540
 541         if (lustre_cfg_buf(lcfg, 4)) {
 542                 __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
 543
 544                 if (refnet == LNET_NET_ANY) {
 545                         rc = -EINVAL;
 546                         CERROR("%s: bad mount option 'network=%s': rc = %d\n",
 547                                obd->obd_name, lustre_cfg_string(lcfg, 4),
 548                                rc);
 549                         GOTO(err_import, rc);
 550                 }
 551                 lnet_nid4_to_nid(LNET_MKNID(refnet, 0), &fake_conn.c_self);
 552                 imp->imp_connection = &fake_conn;
 553         }
 554
 555         rc = client_import_add_conn(imp, &server_uuid, 1);
 556         if (rc) {
 557                 CERROR("can't add initial connection\n");
 558                 GOTO(err_import, rc);
 559         }
 560         imp->imp_connection = NULL;
 561
 562         cli->cl_import = imp;
 563         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
 564         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 565
 566         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 567                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 568                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 569                                name, obd->obd_name,
 570                                cli->cl_target_uuid.uuid);
 571                         spin_lock(&imp->imp_lock);
 572                         imp->imp_deactive = 1;
 573                         spin_unlock(&imp->imp_lock);
 574                 }
 575         }
 576
 577         obd->obd_namespace = ldlm_namespace_new(obd, obd->obd_name,
 578                                                 LDLM_NAMESPACE_CLIENT,
 579                                                 LDLM_NAMESPACE_GREEDY,
 580                                                 ns_type);
 581         if (IS_ERR(obd->obd_namespace)) {
 582                 rc = PTR_ERR(obd->obd_namespace);
 583                 CERROR("%s: unable to create client namespace: rc = %d\n",
 584                        obd->obd_name, rc);
 585                 obd->obd_namespace = NULL;
 586                 GOTO(err_import, rc);
 587         }
 588
 589         RETURN(rc);
 590
 591 err_import:
 592         class_destroy_import(imp);
 593 err_ldlm:
 594         ldlm_put_ref();
 595 err:
 596         if (cli->cl_mod_tag_bitmap != NULL)
 597                 OBD_FREE(cli->cl_mod_tag_bitmap,
 598                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 599         cli->cl_mod_tag_bitmap = NULL;
 600
 601         RETURN(rc);
 602 }
 603 EXPORT_SYMBOL(client_obd_setup);
 604
 605 int client_obd_cleanup(struct obd_device *obd)
 606 {
 607         struct client_obd *cli = &obd->u.cli;
 608
 609         ENTRY;
 610
 611         ldlm_namespace_free_post(obd->obd_namespace);
 612         obd->obd_namespace = NULL;
 613
 614         obd_cleanup_client_import(obd);
 615         LASSERT(obd->u.cli.cl_import == NULL);
 616
 617         ldlm_put_ref();
 618
 619         if (cli->cl_mod_tag_bitmap != NULL)
 620                 OBD_FREE(cli->cl_mod_tag_bitmap,
 621                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 622         cli->cl_mod_tag_bitmap = NULL;
 623
 624         RETURN(0);
 625 }
 626 EXPORT_SYMBOL(client_obd_cleanup);
 627
 628 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 629 int client_connect_import(const struct lu_env *env,
 630                           struct obd_export **exp,
 631                           struct obd_device *obd, struct obd_uuid *cluuid,
 632                           struct obd_connect_data *data, void *localdata)
 633 {
 634         struct client_obd *cli = &obd->u.cli;
 635         struct obd_import *imp = cli->cl_import;
 636         struct obd_connect_data *ocd;
 637         struct lustre_handle conn = { 0 };
 638         int rc;
 639
 640         ENTRY;
 641
 642         *exp = NULL;
 643         down_write(&cli->cl_sem);
 644         if (cli->cl_conn_count > 0)
 645                 GOTO(out_sem, rc = -EALREADY);
 646
 647         rc = class_connect(&conn, obd, cluuid);
 648         if (rc)
 649                 GOTO(out_sem, rc);
 650
 651         cli->cl_conn_count++;
 652         *exp = class_conn2export(&conn);
 653
 654         LASSERT(obd->obd_namespace);
 655
 656         spin_lock(&imp->imp_lock);
 657         if (imp->imp_state == LUSTRE_IMP_CLOSED && imp->imp_deactive) {
 658                 /* need to reactivate import if trying to connect
 659                  * to a previously disconnected
 660                  */
 661                 imp->imp_deactive = 0;
 662                 imp->imp_invalid = 0;
 663         }
 664         spin_unlock(&imp->imp_lock);
 665
 666         imp->imp_dlm_handle = conn;
 667         rc = ptlrpc_init_import(imp);
 668         if (rc != 0)
 669                 GOTO(out_ldlm, rc);
 670
 671         ocd = &imp->imp_connect_data;
 672         if (data) {
 673                 *ocd = *data;
 674                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 675                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
 676         }
 677
 678         rc = ptlrpc_connect_import(imp);
 679         if (rc != 0) {
 680                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 681                 GOTO(out_ldlm, rc);
 682         }
 683         LASSERT(*exp != NULL && (*exp)->exp_connection);
 684
 685         if (data) {
 686                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 687                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 688                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 689                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 690                 data->ocd_connect_flags2 = ocd->ocd_connect_flags2;
 691         }
 692
 693         ptlrpc_pinger_add_import(imp);
 694
 695         EXIT;
 696
 697         if (rc) {
 698 out_ldlm:
 699                 cli->cl_conn_count--;
 700                 class_disconnect(*exp);
 701                 *exp = NULL;
 702         }
 703 out_sem:
 704         up_write(&cli->cl_sem);
 705
 706         if (!rc && localdata && !cli->cl_cache) {
 707                 cli->cl_cache = (struct cl_client_cache *)localdata;
 708                 cl_cache_incref(cli->cl_cache);
 709                 cli->cl_lru_left = &cli->cl_cache->ccc_lru_left;
 710
 711                 /* add this osc into entity list */
 712                 LASSERT(list_empty(&cli->cl_lru_osc));
 713                 spin_lock(&cli->cl_cache->ccc_lru_lock);
 714                 list_add(&cli->cl_lru_osc, &cli->cl_cache->ccc_lru);
 715                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
 716         }
 717
 718         return rc;
 719 }
 720 EXPORT_SYMBOL(client_connect_import);
 721
 722 int client_disconnect_export(struct obd_export *exp)
 723 {
 724         struct obd_device *obd = class_exp2obd(exp);
 725         struct client_obd *cli;
 726         struct obd_import *imp;
 727         int rc = 0, err;
 728
 729         ENTRY;
 730
 731         if (!obd) {
 732                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 733                        exp, exp ? exp->exp_handle.h_cookie : -1);
 734                 RETURN(-EINVAL);
 735         }
 736
 737         cli = &obd->u.cli;
 738         imp = cli->cl_import;
 739
 740         down_write(&cli->cl_sem);
 741         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
 742                 cli->cl_conn_count);
 743
 744         if (cli->cl_conn_count == 0) {
 745                 CERROR("disconnecting disconnected device (%s)\n",
 746                        obd->obd_name);
 747                 GOTO(out_disconnect, rc = -EINVAL);
 748         }
 749
 750         cli->cl_conn_count--;
 751         if (cli->cl_conn_count != 0)
 752                 GOTO(out_disconnect, rc = 0);
 753
 754         /*
 755          * Mark import deactivated now, so we don't try to reconnect if any
 756          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 757          * fully deactivate the import, or that would drop all requests.
 758          */
 759         spin_lock(&imp->imp_lock);
 760         imp->imp_deactive = 1;
 761         spin_unlock(&imp->imp_lock);
 762
 763         /*
 764          * Some non-replayable imports (MDS's OSCs) are pinged, so just
 765          * delete it regardless.  (It's safe to delete an import that was
 766          * never added.)
 767          */
 768         (void)ptlrpc_pinger_del_import(imp);
 769
 770         if (obd->obd_namespace != NULL) {
 771                 /* obd_force == local only */
 772                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 773                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 774                 ldlm_namespace_free_prior(obd->obd_namespace, imp,
 775                                           obd->obd_force);
 776         }
 777
 778         /*
 779          * There's no need to hold sem while disconnecting an import,
 780          * and it may actually cause deadlock in GSS.
 781          */
 782         up_write(&cli->cl_sem);
 783         rc = ptlrpc_disconnect_import(imp, 0);
 784         down_write(&cli->cl_sem);
 785
 786         ptlrpc_invalidate_import(imp);
 787
 788         EXIT;
 789
 790 out_disconnect:
 791         /*
 792          * Use server style - class_disconnect should be always called for
 793          * o_disconnect.
 794          */
 795         err = class_disconnect(exp);
 796         if (!rc && err)
 797                 rc = err;
 798
 799         up_write(&cli->cl_sem);
 800
 801         RETURN(rc);
 802 }
 803 EXPORT_SYMBOL(client_disconnect_export);
 804
 805 #ifdef HAVE_SERVER_SUPPORT
 806 int server_disconnect_export(struct obd_export *exp)
 807 {
 808         int rc;
 809
 810         ENTRY;
 811
 812         /* Disconnect early so that clients can't keep using export. */
 813         rc = class_disconnect(exp);
 814         /* Close import to avoid sending any requests. */
 815         if (exp->exp_imp_reverse)
 816                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 817
 818         ldlm_bl_thread_wakeup();
 819
 820         /* complete all outstanding replies */
 821         spin_lock(&exp->exp_lock);
 822         while (!list_empty(&exp->exp_outstanding_replies)) {
 823                 struct ptlrpc_reply_state *rs =
 824                         list_entry(exp->exp_outstanding_replies.next,
 825                                        struct ptlrpc_reply_state, rs_exp_list);
 826                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 827
 828                 spin_lock(&svcpt->scp_rep_lock);
 829
 830                 list_del_init(&rs->rs_exp_list);
 831
 832                 spin_lock(&rs->rs_lock);
 833                 /* clear rs_convert_lock to make sure rs is handled and put */
 834                 rs->rs_convert_lock = 0;
 835                 ptlrpc_schedule_difficult_reply(rs);
 836                 spin_unlock(&rs->rs_lock);
 837
 838                 spin_unlock(&svcpt->scp_rep_lock);
 839         }
 840         spin_unlock(&exp->exp_lock);
 841
 842         RETURN(rc);
 843 }
 844 EXPORT_SYMBOL(server_disconnect_export);
 845
 846 static inline int target_check_recovery_timer(struct obd_device *target)
 847 {
 848         ktime_t remaining;
 849         s64 timeout;
 850
 851         if (!target->obd_recovering || target->obd_recovery_start == 0)
 852                 return 0;
 853
 854         remaining = hrtimer_get_remaining(&target->obd_recovery_timer);
 855         timeout = ktime_divns(remaining, NSEC_PER_SEC);
 856         if (timeout > -30)
 857                 return 0;
 858
 859         /* the recovery timer should expire, but it isn't triggered,
 860          * it's better to abort the recovery of this target to speed up
 861          * the recovery of the whole cluster. */
 862         spin_lock(&target->obd_dev_lock);
 863         if (target->obd_recovering) {
 864                 CERROR("%s: Aborting recovery\n", target->obd_name);
 865                 target->obd_abort_recovery = 1;
 866                 wake_up(&target->obd_next_transno_waitq);
 867         }
 868         spin_unlock(&target->obd_dev_lock);
 869         return 0;
 870 }
 871
 872 /*
 873  * --------------------------------------------------------------------------
 874  * from old lib/target.c
 875  * --------------------------------------------------------------------------
 876  */
 877 static int target_handle_reconnect(struct lustre_handle *conn,
 878                                    struct obd_export *exp,
 879                                    struct obd_uuid *cluuid)
 880 {
 881         struct obd_device *target;
 882         struct lustre_handle *hdl;
 883         ktime_t remaining;
 884         s64 timeout;
 885         int rc = 0;
 886
 887         ENTRY;
 888         hdl = &exp->exp_imp_reverse->imp_remote_handle;
 889         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
 890                 conn->cookie = exp->exp_handle.h_cookie;
 891                 CDEBUG(D_HA,
 892                        "connect export for UUID '%s' at %p, cookie %#llx\n",
 893                        cluuid->uuid, exp, conn->cookie);
 894                 RETURN(0);
 895         }
 896
 897         target = exp->exp_obd;
 898
 899         /* Might be a re-connect after a partition. */
 900         if (memcmp(&conn->cookie, &hdl->cookie, sizeof(conn->cookie))) {
 901                 LCONSOLE_WARN("%s: already connected client %s (at %s) with handle %#llx. Rejecting client with the same UUID trying to reconnect with handle %#llx\n",
 902                               target->obd_name,
 903                               obd_uuid2str(&exp->exp_client_uuid),
 904                               obd_export_nid2str(exp),
 905                               hdl->cookie, conn->cookie);
 906                 memset(conn, 0, sizeof(*conn));
 907                 /*
 908                  * target_handle_connect() treats EALREADY and
 909                  * -EALREADY differently.  -EALREADY is an error
 910                  * (same UUID, different handle).
 911                  */
 912                 RETURN(-EALREADY);
 913         }
 914
 915         if (!target->obd_recovering) {
 916                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
 917                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
 918                         obd_export_nid2str(exp));
 919                 GOTO(out_already, rc);
 920         }
 921
 922         remaining = hrtimer_get_remaining(&target->obd_recovery_timer);
 923         timeout = ktime_divns(remaining, NSEC_PER_SEC);
 924         if (timeout > 0) {
 925                 LCONSOLE_WARN("%s: Client %s (at %s) reconnected, waiting for %d clients in recovery for %lld:%.02lld\n",
 926                               target->obd_name,
 927                               obd_uuid2str(&exp->exp_client_uuid),
 928                               obd_export_nid2str(exp),
 929                               atomic_read(&target->obd_max_recoverable_clients),
 930                               timeout / 60, timeout % 60);
 931         } else {
 932                 struct target_distribute_txn_data *tdtd;
 933                 int size = 0;
 934                 int count = 0;
 935                 char *buf = NULL;
 936
 937                 target_check_recovery_timer(target);
 938
 939                 tdtd = class_exp2tgt(exp)->lut_tdtd;
 940                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
 941                         buf = tdtd->tdtd_show_update_logs_retrievers(
 942                                 tdtd->tdtd_show_retrievers_cbdata,
 943                                 &size, &count);
 944
 945                 if (count > 0)
 946                         LCONSOLE_WARN("%s: Client %s (at %s) reconnecting, waiting for %d MDTs (%s) in recovery for %lld:%.02lld. Please wait until all MDTs recovered or you may force MDT evicition via 'lctl --device %s abort_recovery.\n",
 947                                       target->obd_name,
 948                                       obd_uuid2str(&exp->exp_client_uuid),
 949                                       obd_export_nid2str(exp), count,
 950                                       buf ? buf : "unknown (not enough RAM)",
 951                                       (abs(timeout) + target->obd_recovery_timeout) / 60,
 952                                       (abs(timeout) + target->obd_recovery_timeout) % 60,
 953                                       target->obd_name);
 954                 else
 955                         LCONSOLE_WARN("%s: Recovery already passed deadline %lld:%.02lld. If you do not want to wait more, you may force taget eviction via 'lctl --device %s abort_recovery.\n",
 956                                       target->obd_name, abs(timeout) / 60,
 957                                       abs(timeout) % 60, target->obd_name);
 958
 959                 if (buf != NULL)
 960                         OBD_FREE(buf, size);
 961         }
 962
 963 out_already:
 964         conn->cookie = exp->exp_handle.h_cookie;
 965         /*
 966          * target_handle_connect() treats EALREADY and
 967          * -EALREADY differently.  EALREADY means we are
 968          * doing a valid reconnect from the same client.
 969          */
 970         RETURN(EALREADY);
 971 }
 972
 973 static void
 974 check_and_start_recovery_timer(struct obd_device *obd,
 975                                struct ptlrpc_request *req, int new_client);
 976
 977 /**
 978  * update flags for import during reconnect process
 979  */
 980 static int rev_import_flags_update(struct obd_import *revimp,
 981                                    struct ptlrpc_request *req)
 982 {
 983         int rc;
 984         struct obd_connect_data *data;
 985
 986         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 987
 988         if (data->ocd_connect_flags & OBD_CONNECT_AT)
 989                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 990         else
 991                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 992
 993         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
 994
 995         revimp->imp_connect_data = *data;
 996         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
 997         if (rc) {
 998                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
 999                         revimp->imp_client->cli_name,
1000                         libcfs_idstr(&req->rq_peer), rc);
1001                 return rc;
1002         }
1003
1004         return 0;
1005 }
1006
1007 /**
1008  * Allocate a new reverse import for an export.
1009  *
1010  * \retval -errno in case error hit
1011  * \retval 0 if reverse import correctly init
1012  **/
1013 int rev_import_init(struct obd_export *export)
1014 {
1015         struct obd_device *obd = export->exp_obd;
1016         struct obd_import *revimp;
1017
1018         LASSERT(export->exp_imp_reverse == NULL);
1019
1020         revimp = class_new_import(obd);
1021         if (revimp == NULL)
1022                 return -ENOMEM;
1023
1024         revimp->imp_remote_handle.cookie = 0ULL;
1025         revimp->imp_client = &obd->obd_ldlm_client;
1026         revimp->imp_dlm_fake = 1;
1027
1028         /* it is safe to connect import in new state as no sends possible */
1029         spin_lock(&export->exp_lock);
1030         export->exp_imp_reverse = revimp;
1031         spin_unlock(&export->exp_lock);
1032         class_import_put(revimp);
1033
1034         return 0;
1035 }
1036 EXPORT_SYMBOL(rev_import_init);
1037
1038 /**
1039  * Handle reconnect for an export.
1040  *
1041  * \param exp export to handle reconnect process
1042  * \param req client reconnect request
1043  *
1044  * \retval -rc in case securitfy flavor can't be changed
1045  * \retval 0 in case none problems
1046  */
1047 static int rev_import_reconnect(struct obd_export *exp,
1048                                 struct ptlrpc_request *req)
1049 {
1050         struct obd_import *revimp = exp->exp_imp_reverse;
1051         struct lustre_handle *lh;
1052         int rc;
1053
1054         /* avoid sending a request until import flags are changed */
1055         ptlrpc_import_enter_resend(revimp);
1056
1057         ptlrpc_connection_put(revimp->imp_connection);
1058
1059         /*
1060          * client from recovery don't have a handle so we need to take from
1061          * request. it may produce situation when wrong client connected
1062          * to recovery as we trust a client uuid
1063          */
1064         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1065         revimp->imp_remote_handle = *lh;
1066
1067         /*
1068          * unknown versions will be caught in
1069          * ptlrpc_handle_server_req_in->lustre_unpack_msg()
1070          */
1071         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1072
1073         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
1074
1075         rc = rev_import_flags_update(revimp, req);
1076         if (rc != 0) {
1077                 /*
1078                  * it is safe to still be in RECOVERY phase as we are not able
1079                  * to setup correct security flavor so requests are not able to
1080                  * be delivered correctly
1081                  */
1082                 return rc;
1083         }
1084
1085         /* resend all rpc's via new connection */
1086         return ptlrpc_import_recovery_state_machine(revimp);
1087 }
1088
1089 int target_handle_connect(struct ptlrpc_request *req)
1090 {
1091         struct obd_device *target = NULL;
1092         struct obd_export *export = NULL;
1093         /*
1094          * connect handle - filled from target_handle_reconnect in
1095          * reconnect case
1096          */
1097         struct lustre_handle conn;
1098         struct lustre_handle *tmp;
1099         struct obd_uuid cluuid;
1100         char *str;
1101         int rc = 0;
1102         char *target_start;
1103         int target_len;
1104         bool mds_conn = false, lw_client = false, initial_conn = false;
1105         bool mds_mds_conn = false;
1106         bool new_mds_mds_conn = false;
1107         struct obd_connect_data *data, *tmpdata;
1108         int size, tmpsize;
1109         lnet_nid_t client_nid;
1110         struct ptlrpc_connection *pcon = NULL;
1111
1112         ENTRY;
1113
1114         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
1115
1116         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
1117         if (str == NULL) {
1118                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
1119                 GOTO(out, rc = -EINVAL);
1120         }
1121
1122         target = class_dev_by_str(str);
1123         if (!target) {
1124                 deuuidify(str, NULL, &target_start, &target_len);
1125                 LCONSOLE_ERROR_MSG(0x137,
1126                                    "%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",
1127                                    str, libcfs_nidstr(&req->rq_peer.nid));
1128                 GOTO(out, rc = -ENODEV);
1129         }
1130
1131         spin_lock(&target->obd_dev_lock);
1132
1133         target->obd_conn_inprogress++;
1134
1135         if (target->obd_stopping || !target->obd_set_up) {
1136                 spin_unlock(&target->obd_dev_lock);
1137
1138                 deuuidify(str, NULL, &target_start, &target_len);
1139                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
1140                               target_len, target_start,
1141                               libcfs_nidstr(&req->rq_peer.nid),
1142                               (target->obd_stopping ?
1143                                "stopping" : "not set up"));
1144                 GOTO(out, rc = -ENODEV);
1145         }
1146
1147         if (target->obd_no_conn) {
1148                 spin_unlock(&target->obd_dev_lock);
1149
1150                 CDEBUG(D_INFO,
1151                        "%s: Temporarily refusing client connection from %s\n",
1152                        target->obd_name, libcfs_nidstr(&req->rq_peer.nid));
1153                 GOTO(out, rc = -EAGAIN);
1154         }
1155
1156         spin_unlock(&target->obd_dev_lock);
1157
1158         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1159         if (str == NULL) {
1160                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1161                 GOTO(out, rc = -EINVAL);
1162         }
1163
1164         obd_str2uuid(&cluuid, str);
1165
1166         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1167         if (tmp == NULL)
1168                 GOTO(out, rc = -EPROTO);
1169
1170         conn = *tmp;
1171
1172         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1173                                     RCL_CLIENT);
1174         if (size < 0 || size > 8 * sizeof(struct obd_connect_data))
1175                 GOTO(out, rc = -EPROTO);
1176         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1177         if (!data)
1178                 GOTO(out, rc = -EPROTO);
1179
1180         rc = req_capsule_server_pack(&req->rq_pill);
1181         if (rc)
1182                 GOTO(out, rc);
1183
1184 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1185         /*
1186          * Don't allow clients to connect that are using old 1.8 format
1187          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1188          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1189          * FULL20 flag should be set on all connections since 2.0, but no
1190          * longer affects behaviour.
1191          *
1192          * Later this check will be disabled and the flag can be retired
1193          * completely once interop with 3.0 is no longer needed.
1194          */
1195         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1196                 GOTO(out, rc = -EPROTO);
1197
1198         /*
1199          * Don't allow liblustre clients to connect.
1200          * - testing was disabled in v2_2_50_0-61-g6a75d65
1201          * - building was disabled in v2_5_58_0-28-g7277179
1202          * - client code was deleted in v2_6_50_0-101-gcdfbc72,
1203          * - clients were refused connect for version difference > 0.0.1.32
1204          */
1205         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1206                 DEBUG_REQ(D_WARNING, req, "Refusing libclient connection");
1207                 GOTO(out, rc = -EPROTO);
1208         }
1209 #endif
1210
1211         /*
1212          * Note: lw_client is needed in MDS-MDS failover during update log
1213          * processing, so we needs to allow lw_client to be connected at
1214          * anytime, instead of only the initial connection
1215          */
1216         lw_client = OCD_HAS_FLAG(data, LIGHTWEIGHT);
1217
1218         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1219                 initial_conn = true;
1220                 mds_conn = OCD_HAS_FLAG(data, MDS);
1221                 mds_mds_conn = OCD_HAS_FLAG(data, MDS_MDS);
1222
1223                 /*
1224                  * OBD_CONNECT_MNE_SWAB is removed at 2.14
1225                  * Checking OBD_CONNECT_FID can be removed in the future.
1226                  *
1227                  * Via check OBD_CONNECT_FID, we can distinguish whether
1228                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1229                  * MGC or MDT, since MGC does not use OBD_CONNECT_FID.
1230                  */
1231                 if (!lw_client &&
1232                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1233                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1234                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1235                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1236                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1237                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1238
1239                         /*
1240                          * We do not support the MDT-MDT interoperations with
1241                          * different version MDT because of protocol changes.
1242                          */
1243                         if (unlikely(major != LUSTRE_MAJOR ||
1244                                      minor != LUSTRE_MINOR ||
1245                                      abs(patch - LUSTRE_PATCH) > 3)) {
1246                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the connection from different version MDT (%d.%d.%d.%d) %s %s\n",
1247                                               target->obd_name, LUSTRE_MAJOR,
1248                                               LUSTRE_MINOR, LUSTRE_PATCH,
1249                                               LUSTRE_FIX, major, minor, patch,
1250                                               OBD_OCD_VERSION_FIX(data->ocd_version),
1251                                               libcfs_nidstr(&req->rq_peer.nid),
1252                                               str);
1253                                 GOTO(out, rc = -EPROTO);
1254                         }
1255                 }
1256         }
1257
1258         /* lctl gets a backstage, all-access pass. */
1259         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1260                 goto dont_check_exports;
1261
1262         export = obd_uuid_lookup(target, &cluuid);
1263         if (!export)
1264                 goto no_export;
1265
1266         /* We've found an export in the hash. */
1267
1268         spin_lock(&export->exp_lock);
1269
1270         if (export->exp_connecting) { /* b=9635, et. al. */
1271                 spin_unlock(&export->exp_lock);
1272                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1273                               export->exp_obd->obd_name, export,
1274                               libcfs_nidstr(&req->rq_peer.nid));
1275                 class_export_put(export);
1276                 export = NULL;
1277                 rc = -EALREADY;
1278         } else if ((mds_conn || (lw_client && initial_conn) ||
1279                    OCD_HAS_FLAG(data, MDS_MDS)) && export->exp_connection) {
1280                 spin_unlock(&export->exp_lock);
1281                 if (!nid_same(&req->rq_peer.nid,
1282                               &export->exp_connection->c_peer.nid)) {
1283                         /* MDS or LWP reconnected after failover. */
1284                         LCONSOLE_WARN("%s: Received %s connection from %s, removing former export from %s\n",
1285                                       target->obd_name,
1286                                       lw_client ? "LWP" : "MDS",
1287                                       libcfs_nidstr(&req->rq_peer.nid),
1288                                       libcfs_nidstr(&export->exp_connection->c_peer.nid));
1289                 } else {
1290                         /* New connection from the same NID. */
1291                         LCONSOLE_WARN("%s: Received new %s connection from %s, %s former export from same NID\n",
1292                                       target->obd_name,
1293                                       lw_client ? "LWP" : "MDS",
1294                                       libcfs_nidstr(&req->rq_peer.nid),
1295                                       OCD_HAS_FLAG(data, MDS_MDS) ?
1296                                       "keep" : "remove");
1297                 }
1298
1299                 if (nid_same(&req->rq_peer.nid,
1300                              &export->exp_connection->c_peer.nid) &&
1301                     OCD_HAS_FLAG(data, MDS_MDS)) {
1302                         /*
1303                          * Because exports between MDTs will always be
1304                          * kept, let's do not fail such export if they
1305                          * come from the same NID, otherwise it might
1306                          * cause eviction between MDTs, which might
1307                          * cause namespace inconsistency
1308                          */
1309                         spin_lock(&export->exp_lock);
1310                         export->exp_connecting = 1;
1311                         export->exp_conn_cnt = 0;
1312                         spin_unlock(&export->exp_lock);
1313                         conn.cookie = export->exp_handle.h_cookie;
1314                         rc = EALREADY;
1315                 } else {
1316                         class_fail_export(export);
1317                         class_export_put(export);
1318                         export = NULL;
1319                         rc = 0;
1320                 }
1321         } else if (export->exp_connection != NULL && initial_conn &&
1322                    !nid_same(&req->rq_peer.nid,
1323                              &export->exp_connection->c_peer.nid)) {
1324                 spin_unlock(&export->exp_lock);
1325                 /* In MDS failover we have static UUID but NID can change. */
1326                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when existing nid %s is already connected\n",
1327                               target->obd_name, cluuid.uuid,
1328                               libcfs_nidstr(&req->rq_peer.nid),
1329                               libcfs_nidstr(
1330                                       &export->exp_connection->c_peer.nid));
1331                 rc = -EALREADY;
1332                 class_export_put(export);
1333                 export = NULL;
1334         } else if (OBD_FAIL_PRECHECK(OBD_FAIL_TGT_RECOVERY_CONNECT) &&
1335                    !lw_client) {
1336                 spin_unlock(&export->exp_lock);
1337                 rc = -EAGAIN;
1338         } else {
1339                 export->exp_connecting = 1;
1340                 spin_unlock(&export->exp_lock);
1341                 LASSERT(export->exp_obd == target);
1342
1343                 rc = target_handle_reconnect(&conn, export, &cluuid);
1344         }
1345
1346         /* If we found an export, we already unlocked. */
1347         if (!export) {
1348 no_export:
1349                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1350         } else if (req->rq_export == NULL &&
1351                    atomic_read(&export->exp_rpc_count) > 0) {
1352                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, still busy with %d references\n",
1353                               target->obd_name, cluuid.uuid,
1354                               libcfs_nidstr(&req->rq_peer.nid),
1355                               refcount_read(&export->exp_handle.h_ref));
1356                         GOTO(out, rc = -EBUSY);
1357         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
1358                    rc != EALREADY) {
1359                 if (!strstr(cluuid.uuid, "mdt"))
1360                         LCONSOLE_WARN("%s: Rejecting reconnect from the known client %s (at %s) because it is indicating it is a new client\n",
1361                                       target->obd_name, cluuid.uuid,
1362                                       libcfs_nidstr(&req->rq_peer.nid));
1363                 GOTO(out, rc = -EALREADY);
1364         } else {
1365                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1366         }
1367
1368         if (rc < 0)
1369                 GOTO(out, rc);
1370
1371         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %lld last %lld\n",
1372                target->obd_name, cluuid.uuid, libcfs_nidstr(&req->rq_peer.nid),
1373                target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1374                export, ktime_get_seconds(),
1375                export ? export->exp_last_request_time : 0);
1376
1377         /*
1378          * If this is the first time a client connects, reset the recovery
1379          * timer. Discard lightweight connections which might be local.
1380          */
1381         if (!lw_client && rc == 0 && target->obd_recovering)
1382                 check_and_start_recovery_timer(target, req, export == NULL);
1383
1384         /*
1385          * We want to handle EALREADY but *not* -EALREADY from
1386          * target_handle_reconnect(), return reconnection state in a flag.
1387          */
1388         if (rc == EALREADY) {
1389                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1390                 rc = 0;
1391         } else {
1392                 LASSERT(rc == 0);
1393         }
1394
1395         /* Tell the client if we support replayable requests. */
1396         if (target->obd_replayable)
1397                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1398         client_nid = lnet_nid_to_nid4(&req->rq_peer.nid);
1399
1400         if (export == NULL) {
1401                 /* allow lightweight connections during recovery */
1402                 /*
1403                  * allow "new" MDT to be connected during recovery, since we
1404                  * need retrieve recovery update records from it
1405                  */
1406                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1407                         struct hrtimer *timer = &target->obd_recovery_timer;
1408                         ktime_t remaining;
1409                         s64 timeout, left;
1410                         int in_progress;
1411                         int connected;
1412                         int known;
1413                         int stale;
1414                         char *msg;
1415
1416                         connected = atomic_read(&target->obd_connected_clients);
1417                         in_progress = atomic_read(&target->obd_lock_replay_clients);
1418                         known =
1419                            atomic_read(&target->obd_max_recoverable_clients);
1420                         stale = target->obd_stale_clients;
1421                         remaining = hrtimer_get_remaining(timer);
1422                         left = ktime_divns(remaining, NSEC_PER_SEC);
1423
1424                         if (ktime_to_ns(remaining) > 0) {
1425                                 msg = "to recover in";
1426                                 timeout = left;
1427                         } else {
1428                                 msg = "already passed deadline";
1429                                 timeout = -left;
1430
1431                                 target_check_recovery_timer(target);
1432                         }
1433
1434                         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",
1435                                       target->obd_name, cluuid.uuid,
1436                                       libcfs_nidstr(&req->rq_peer.nid), known,
1437                                       connected - in_progress, in_progress,
1438                                       stale, msg, timeout / 60, timeout % 60);
1439                         rc = -EBUSY;
1440                 } else {
1441 dont_check_exports:
1442                         rc = obd_connect(req->rq_svc_thread->t_env,
1443                                          &export, target, &cluuid, data,
1444                                          &client_nid);
1445                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1446                                 lustre_msg_add_op_flags(req->rq_repmsg,
1447                                                         MSG_CONNECT_RECOVERING);
1448                         if (rc == 0) {
1449                                 conn.cookie = export->exp_handle.h_cookie;
1450                                 rc = rev_import_init(export);
1451                         }
1452
1453                         if (mds_mds_conn)
1454                                 new_mds_mds_conn = true;
1455                 }
1456         } else {
1457                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1458                                    export, target, &cluuid, data, &client_nid);
1459         }
1460         if (rc)
1461                 GOTO(out, rc);
1462
1463         LASSERT(target->u.obt.obt_magic == OBT_MAGIC);
1464         data->ocd_instance = target->u.obt.obt_instance;
1465
1466         /*
1467          * Return only the parts of obd_connect_data that we understand, so the
1468          * client knows that we don't understand the rest.
1469          */
1470         if (data) {
1471                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1472                                                RCL_SERVER);
1473                 tmpdata = req_capsule_server_get(&req->rq_pill,
1474                                                  &RMF_CONNECT_DATA);
1475                 /*
1476                  * Don't use struct assignment here, because the client reply
1477                  * buffer may be smaller/larger than the local struct
1478                  * obd_connect_data.
1479                  */
1480                 memcpy(tmpdata, data, min(tmpsize, size));
1481         }
1482
1483         /*
1484          * If the client and the server are the same node, we will already
1485          * have an export that really points to the client's DLM export,
1486          * because we have a shared handles table.
1487          *
1488          * XXX this will go away when shaver stops sending the "connect" handle
1489          * in the real "remote handle" field of the request --phik 24 Apr 2003
1490          */
1491         ptlrpc_request_change_export(req, export);
1492
1493         pcon = ptlrpc_connection_get(&req->rq_peer,
1494                                      &req->rq_self, &cluuid);
1495         if (pcon == NULL)
1496                 GOTO(out, rc = -ENOTCONN);
1497
1498         spin_lock(&export->exp_lock);
1499
1500         if (export->exp_disconnected) {
1501                 spin_unlock(&export->exp_lock);
1502                 GOTO(out, rc = -ENODEV);
1503         }
1504         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1505                 spin_unlock(&export->exp_lock);
1506                 CDEBUG(D_RPCTRACE,
1507                        "%s: %s already connected at greater or equal conn_cnt: %d >= %d\n",
1508                        cluuid.uuid, libcfs_nidstr(&req->rq_peer.nid),
1509                        export->exp_conn_cnt,
1510                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1511
1512                 GOTO(out, rc = -EALREADY);
1513         }
1514         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1515         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1516
1517         /* Check to see if connection came from another NID. */
1518         if (export->exp_connection != NULL &&
1519             !nid_same(&export->exp_connection->c_peer.nid,
1520                       &req->rq_peer.nid)) {
1521                 obd_nid_del(export->exp_obd, export);
1522                 ptlrpc_connection_put(export->exp_connection);
1523                 export->exp_connection = NULL;
1524         }
1525
1526         if (export->exp_connection == NULL) {
1527                 export->exp_connection = pcon;
1528                 pcon = NULL;
1529         }
1530         obd_nid_add(export->exp_obd, export);
1531
1532         spin_unlock(&export->exp_lock);
1533
1534         lustre_msg_set_handle(req->rq_repmsg, &conn);
1535
1536         rc = rev_import_reconnect(export, req);
1537         if (rc != 0)
1538                 GOTO(out, rc);
1539
1540         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1541                 int has_transno;
1542                 __u64 transno = data->ocd_transno;
1543
1544                 spin_lock(&export->exp_lock);
1545                 /*
1546                  * possible race with class_disconnect_stale_exports,
1547                  * export may be already in the eviction process
1548                  */
1549                 if (export->exp_failed) {
1550                         spin_unlock(&export->exp_lock);
1551                         GOTO(out, rc = -ENODEV);
1552                 }
1553                 export->exp_in_recovery = 1;
1554                 export->exp_req_replay_needed = 1;
1555                 export->exp_lock_replay_needed = 1;
1556                 spin_unlock(&export->exp_lock);
1557
1558                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1559                                  MSG_CONNECT_TRANSNO);
1560                 if (has_transno && transno == 0)
1561                         CWARN("Connect with zero transno!\n");
1562
1563                 if (has_transno && transno > 0 &&
1564                     transno < target->obd_next_recovery_transno &&
1565                     transno > target->obd_last_committed) {
1566                         /* Another way is to use cmpxchg() to be lock-free. */
1567                         spin_lock(&target->obd_recovery_task_lock);
1568                         if (transno < target->obd_next_recovery_transno)
1569                                 target->obd_next_recovery_transno = transno;
1570                         spin_unlock(&target->obd_recovery_task_lock);
1571                 }
1572
1573                 atomic_inc(&target->obd_req_replay_clients);
1574                 atomic_inc(&target->obd_lock_replay_clients);
1575                 /*
1576                  * Note: MDS-MDS connection is allowed to be connected during
1577                  * recovery, no matter if the exports needs to be recoveried.
1578                  * Because we need retrieve updates logs from all other MDTs.
1579                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1580                  * also needs to be increased to match other recovery checking
1581                  * condition.
1582                  */
1583                 if (new_mds_mds_conn)
1584                         atomic_inc(&target->obd_max_recoverable_clients);
1585
1586                 if (atomic_inc_return(&target->obd_connected_clients) ==
1587                     atomic_read(&target->obd_max_recoverable_clients))
1588                         wake_up(&target->obd_next_transno_waitq);
1589         }
1590
1591         /* Tell the client we're in recovery, when client is involved in it. */
1592         if (target->obd_recovering && !lw_client)
1593                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1594
1595 out:
1596         if (export) {
1597                 spin_lock(&export->exp_lock);
1598                 export->exp_connecting = 0;
1599                 spin_unlock(&export->exp_lock);
1600
1601                 class_export_put(export);
1602         }
1603         if (target != NULL) {
1604                 spin_lock(&target->obd_dev_lock);
1605                 target->obd_conn_inprogress--;
1606                 spin_unlock(&target->obd_dev_lock);
1607                 class_decref(target, "find", current);
1608         }
1609         if (pcon)
1610                 ptlrpc_connection_put(pcon);
1611         req->rq_status = rc;
1612         RETURN(rc);
1613 }
1614
1615 int target_handle_disconnect(struct ptlrpc_request *req)
1616 {
1617         int rc;
1618
1619         ENTRY;
1620
1621         rc = req_capsule_server_pack(&req->rq_pill);
1622         if (rc)
1623                 RETURN(rc);
1624
1625         /* In case of target disconnect, updating sec ctx immediately is
1626          * required in order to record latest sequence number used.
1627          * Sequence is normally updated on export destroy, but this event
1628          * can occur too late, ie after a new target connect request has
1629          * been processed.
1630          * Maintaining correct sequence when client connection becomes idle
1631          * ensures that GSS does not erroneously consider requests as replays.
1632          */
1633         rc = sptlrpc_export_update_ctx(req->rq_export);
1634         if (rc)
1635                 RETURN(rc);
1636
1637         /* Keep the rq_export around so we can send the reply. */
1638         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1639
1640         RETURN(0);
1641 }
1642
1643 void target_destroy_export(struct obd_export *exp)
1644 {
1645         struct obd_import *imp = NULL;
1646         /*
1647          * exports created from last_rcvd data, and "fake"
1648          * exports created by lctl don't have an import
1649          */
1650         spin_lock(&exp->exp_lock);
1651         if (exp->exp_imp_reverse != NULL) {
1652                 imp = exp->exp_imp_reverse;
1653                 exp->exp_imp_reverse = NULL;
1654         }
1655         spin_unlock(&exp->exp_lock);
1656         if (imp != NULL)
1657                 client_destroy_import(imp);
1658
1659         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1660         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1661         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1662         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1663 }
1664 EXPORT_SYMBOL(target_destroy_export);
1665
1666 /*
1667  * Recovery functions
1668  */
1669 static void target_request_copy_get(struct ptlrpc_request *req)
1670 {
1671         class_export_rpc_inc(req->rq_export);
1672         LASSERT(list_empty(&req->rq_list));
1673         INIT_LIST_HEAD(&req->rq_replay_list);
1674
1675         /* Increase refcount to keep request in queue. */
1676         atomic_inc(&req->rq_refcount);
1677         /* Let export know it has replays to be handled. */
1678         atomic_inc(&req->rq_export->exp_replay_count);
1679 }
1680
1681 static void target_request_copy_put(struct ptlrpc_request *req)
1682 {
1683         LASSERT(list_empty(&req->rq_replay_list));
1684         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1685
1686         atomic_dec(&req->rq_export->exp_replay_count);
1687         class_export_rpc_dec(req->rq_export);
1688         ptlrpc_server_drop_request(req);
1689 }
1690
1691 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1692 {
1693         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1694         struct obd_export *exp = req->rq_export;
1695         struct ptlrpc_request *reqiter;
1696         struct ptlrpc_request *dup_req = NULL;
1697         int dup = 0;
1698
1699         LASSERT(exp);
1700
1701         spin_lock(&exp->exp_lock);
1702         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1703                             rq_replay_list) {
1704                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1705                         dup_req = reqiter;
1706                         dup = 1;
1707                         break;
1708                 }
1709         }
1710
1711         if (dup) {
1712                 /* We expect it with RESENT and REPLAY flags. */
1713                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1714                     (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1715                         CERROR("invalid flags %x of resent replay\n",
1716                                lustre_msg_get_flags(req->rq_reqmsg));
1717
1718                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1719                         __u32 new_conn;
1720
1721                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1722                         if (new_conn >
1723                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1724                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1725                                                         new_conn);
1726                 }
1727         } else {
1728                 list_add_tail(&req->rq_replay_list,
1729                               &exp->exp_req_replay_queue);
1730         }
1731
1732         spin_unlock(&exp->exp_lock);
1733         return dup;
1734 }
1735
1736 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1737 {
1738         LASSERT(!list_empty(&req->rq_replay_list));
1739         LASSERT(req->rq_export);
1740
1741         spin_lock(&req->rq_export->exp_lock);
1742         list_del_init(&req->rq_replay_list);
1743         spin_unlock(&req->rq_export->exp_lock);
1744 }
1745
1746 static void target_finish_recovery(struct lu_target *lut)
1747 {
1748         struct obd_device *obd = lut->lut_obd;
1749
1750         ENTRY;
1751
1752         /* Only log a recovery message when recovery has occurred. */
1753         if (obd->obd_recovery_start) {
1754                 time64_t now = ktime_get_seconds();
1755                 time64_t elapsed_time;
1756
1757                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start,
1758                                      1);
1759                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients %d recovered and %d %s evicted.\n",
1760                               obd->obd_name, elapsed_time / 60,
1761                               elapsed_time % 60,
1762                               atomic_read(&obd->obd_max_recoverable_clients),
1763                               atomic_read(&obd->obd_connected_clients),
1764                               obd->obd_stale_clients,
1765                               obd->obd_stale_clients == 1 ? "was" : "were");
1766                 if (obd->obd_stale_clients && do_dump_on_eviction(obd))
1767                         libcfs_debug_dumplog();
1768         }
1769
1770         ldlm_reprocess_recovery_done(obd->obd_namespace);
1771         spin_lock(&obd->obd_recovery_task_lock);
1772         if (!list_empty(&obd->obd_req_replay_queue) ||
1773             !list_empty(&obd->obd_lock_replay_queue) ||
1774             !list_empty(&obd->obd_final_req_queue)) {
1775                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1776                        obd->obd_name,
1777                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1778                        list_empty(&obd->obd_lock_replay_queue) ? \
1779                                   "" : "lock ",
1780                        list_empty(&obd->obd_final_req_queue) ? \
1781                                   "" : "final ");
1782                 spin_unlock(&obd->obd_recovery_task_lock);
1783                 LBUG();
1784         }
1785         spin_unlock(&obd->obd_recovery_task_lock);
1786
1787         obd->obd_recovery_end = ktime_get_seconds();
1788
1789         /* When recovery finished, cleanup orphans on MDS and OST. */
1790         if (obd->obd_type && OBP(obd, postrecov)) {
1791                 int rc = OBP(obd, postrecov)(obd);
1792
1793                 if (rc < 0)
1794                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1795                                       obd->obd_name, rc);
1796         }
1797         EXIT;
1798 }
1799
1800 static void abort_req_replay_queue(struct obd_device *obd)
1801 {
1802         struct ptlrpc_request *req, *n;
1803         LIST_HEAD(abort_list);
1804
1805         spin_lock(&obd->obd_recovery_task_lock);
1806         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1807         spin_unlock(&obd->obd_recovery_task_lock);
1808         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1809                 DEBUG_REQ(D_WARNING, req, "aborted:");
1810                 req->rq_status = -ENOTCONN;
1811                 if (ptlrpc_error(req)) {
1812                         DEBUG_REQ(D_ERROR, req,
1813                                   "failed abort_req_reply; skipping");
1814                 }
1815                 target_exp_dequeue_req_replay(req);
1816                 target_request_copy_put(req);
1817         }
1818 }
1819
1820 static void abort_lock_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_lock_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_ERROR, req, "aborted:");
1830                 req->rq_status = -ENOTCONN;
1831                 if (ptlrpc_error(req)) {
1832                         DEBUG_REQ(D_ERROR, req,
1833                                   "failed abort_lock_reply; skipping");
1834                 }
1835                 target_request_copy_put(req);
1836         }
1837 }
1838
1839 /*
1840  * Called from a cleanup function if the device is being cleaned up
1841  * forcefully.  The exports should all have been disconnected already,
1842  * the only thing left to do is
1843  * - clear the recovery flags
1844  * - cancel the timer
1845  * - free queued requests and replies, but don't send replies
1846  * Because the obd_stopping flag is set, no new requests should be received.
1847  */
1848 void target_cleanup_recovery(struct obd_device *obd)
1849 {
1850         struct ptlrpc_request *req, *n;
1851         LIST_HEAD(clean_list);
1852
1853         spin_lock(&obd->obd_dev_lock);
1854         if (!obd->obd_recovering) {
1855                 spin_unlock(&obd->obd_dev_lock);
1856                 EXIT;
1857                 return;
1858         }
1859         obd->obd_recovering = obd->obd_abort_recovery = 0;
1860         obd->obd_abort_recov_mdt = 0;
1861         spin_unlock(&obd->obd_dev_lock);
1862
1863         spin_lock(&obd->obd_recovery_task_lock);
1864         target_cancel_recovery_timer(obd);
1865         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1866         spin_unlock(&obd->obd_recovery_task_lock);
1867
1868         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1869                 LASSERT(req->rq_reply_state == NULL);
1870                 target_exp_dequeue_req_replay(req);
1871                 target_request_copy_put(req);
1872         }
1873
1874         spin_lock(&obd->obd_recovery_task_lock);
1875         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1876         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1877         spin_unlock(&obd->obd_recovery_task_lock);
1878
1879         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1880                 LASSERT(req->rq_reply_state == NULL);
1881                 target_request_copy_put(req);
1882         }
1883
1884         EXIT;
1885 }
1886 EXPORT_SYMBOL(target_cleanup_recovery);
1887
1888 /* obd_recovery_task_lock should be held */
1889 void target_cancel_recovery_timer(struct obd_device *obd)
1890 {
1891         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1892         hrtimer_cancel(&obd->obd_recovery_timer);
1893 }
1894
1895 static void target_start_recovery_timer(struct obd_device *obd)
1896 {
1897         ktime_t delay;
1898
1899         if (obd->obd_recovery_start != 0)
1900                 return;
1901
1902         spin_lock(&obd->obd_dev_lock);
1903         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1904                 spin_unlock(&obd->obd_dev_lock);
1905                 return;
1906         }
1907
1908         LASSERT(obd->obd_recovery_timeout != 0);
1909
1910         if (obd->obd_recovery_start != 0) {
1911                 spin_unlock(&obd->obd_dev_lock);
1912                 return;
1913         }
1914
1915         obd->obd_recovery_start = ktime_get_seconds();
1916         delay = ktime_set(obd->obd_recovery_start +
1917                           obd->obd_recovery_timeout, 0);
1918         hrtimer_start(&obd->obd_recovery_timer, delay, HRTIMER_MODE_ABS);
1919         spin_unlock(&obd->obd_dev_lock);
1920
1921         LCONSOLE_WARN("%s: Will be in recovery for at least %u:%02u, or until %d client%s reconnect%s\n",
1922                       obd->obd_name,
1923                       obd->obd_recovery_timeout / 60,
1924                       obd->obd_recovery_timeout % 60,
1925                       atomic_read(&obd->obd_max_recoverable_clients),
1926                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1927                       "" : "s",
1928                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1929                       "s" : "");
1930 }
1931
1932 /**
1933  * extend recovery window.
1934  *
1935  * if @extend is true, extend recovery window to have @dr_timeout remaining
1936  * at least; otherwise, make sure the recovery timeout value is not less
1937  * than @dr_timeout.
1938  */
1939 static void extend_recovery_timer(struct obd_device *obd, timeout_t dr_timeout,
1940                                   bool extend)
1941 {
1942         ktime_t left_ns;
1943         timeout_t timeout;
1944         timeout_t left;
1945
1946         spin_lock(&obd->obd_dev_lock);
1947         if (!obd->obd_recovering || obd->obd_abort_recovery ||
1948             obd->obd_stopping) {
1949                 spin_unlock(&obd->obd_dev_lock);
1950                 return;
1951         }
1952         LASSERT(obd->obd_recovery_start != 0);
1953
1954         left_ns = hrtimer_get_remaining(&obd->obd_recovery_timer);
1955         left = ktime_divns(left_ns, NSEC_PER_SEC);
1956
1957         if (extend) {
1958                 timeout = obd->obd_recovery_timeout;
1959                 /* dr_timeout will happen after the hrtimer has expired.
1960                  * Add the excess time to the soft recovery timeout without
1961                  * exceeding the hard recovery timeout.
1962                  */
1963                 if (dr_timeout > left) {
1964                         timeout += dr_timeout - left;
1965                         timeout = min_t(timeout_t, obd->obd_recovery_time_hard,
1966                                         timeout);
1967                 }
1968         } else {
1969                 timeout = clamp_t(timeout_t, dr_timeout,
1970                                   obd->obd_recovery_timeout,
1971                                   obd->obd_recovery_time_hard);
1972         }
1973
1974         if (timeout == obd->obd_recovery_time_hard)
1975                 CWARN("%s: extended recovery timer reached hard limit: %d, extend: %d\n",
1976                       obd->obd_name, timeout, extend);
1977
1978         if (obd->obd_recovery_timeout < timeout) {
1979                 ktime_t end, now;
1980
1981                 obd->obd_recovery_timeout = timeout;
1982                 end = ktime_set(obd->obd_recovery_start + timeout, 0);
1983                 now = ktime_set(ktime_get_seconds(), 0);
1984                 left_ns = ktime_sub(end, now);
1985                 hrtimer_start(&obd->obd_recovery_timer, end, HRTIMER_MODE_ABS);
1986                 left = ktime_divns(left_ns, NSEC_PER_SEC);
1987         }
1988         spin_unlock(&obd->obd_dev_lock);
1989
1990         CDEBUG(D_HA, "%s: recovery timer will expire in %d seconds\n",
1991                 obd->obd_name, left);
1992 }
1993
1994 /* Reset the timer with each new client connection */
1995 /*
1996  * This timer is actually reconnect_timer, which is for making sure
1997  * the total recovery window is at least as big as my reconnect
1998  * attempt timing. So the initial recovery time_out will be set to
1999  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
2000  * from client is bigger than this, then the recovery time_out will
2001  * be extended to make sure the client could be reconnected, in the
2002  * process, the timeout from the new client should be ignored.
2003  */
2004 static void
2005 check_and_start_recovery_timer(struct obd_device *obd,
2006                                struct ptlrpc_request *req,
2007                                int new_client)
2008 {
2009         timeout_t service_timeout = lustre_msg_get_service_timeout(req->rq_reqmsg);
2010         struct obd_device_target *obt = &obd->u.obt;
2011
2012         if (!new_client && service_timeout)
2013                 /*
2014                  * Teach server about old server's estimates, as first guess
2015                  * at how long new requests will take.
2016                  */
2017                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
2018                             service_timeout);
2019
2020         target_start_recovery_timer(obd);
2021
2022         /*
2023          * Convert the service time to RPC timeout,
2024          * and reuse service_timeout to limit stack usage.
2025          */
2026         service_timeout = at_est2timeout(service_timeout);
2027
2028         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
2029             service_timeout < at_extra)
2030                 service_timeout = at_extra;
2031
2032         /*
2033          * We expect other clients to timeout within service_timeout, then try
2034          * to reconnect, then try the failover server.  The max delay between
2035          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL.
2036          */
2037         service_timeout += 2 * INITIAL_CONNECT_TIMEOUT;
2038
2039         LASSERT(obt->obt_magic == OBT_MAGIC);
2040         service_timeout += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
2041         if (service_timeout > obd->obd_recovery_timeout && !new_client)
2042                 extend_recovery_timer(obd, service_timeout, false);
2043 }
2044
2045 /** Health checking routines */
2046 static inline int exp_connect_healthy(struct obd_export *exp)
2047 {
2048         return exp->exp_in_recovery;
2049 }
2050
2051 /** if export done req_replay or has replay in queue */
2052 static inline int exp_req_replay_healthy(struct obd_export *exp)
2053 {
2054         return (!exp->exp_req_replay_needed ||
2055                 atomic_read(&exp->exp_replay_count) > 0);
2056 }
2057
2058
2059 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
2060 {
2061         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
2062                exp_req_replay_healthy(exp);
2063 }
2064
2065 /** if export done lock_replay or has replay in queue */
2066 static inline int exp_lock_replay_healthy(struct obd_export *exp)
2067 {
2068         return (!exp->exp_lock_replay_needed ||
2069                 atomic_read(&exp->exp_replay_count) > 0);
2070 }
2071
2072 static inline int exp_vbr_healthy(struct obd_export *exp)
2073 {
2074         return !exp->exp_vbr_failed;
2075 }
2076
2077 static inline int exp_finished(struct obd_export *exp)
2078 {
2079         return exp->exp_in_recovery && !exp->exp_lock_replay_needed;
2080 }
2081
2082 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
2083 {
2084         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
2085                 exp_finished(exp);
2086 }
2087
2088 static int check_for_next_transno(struct lu_target *lut)
2089 {
2090         struct ptlrpc_request *req = NULL;
2091         struct obd_device *obd = lut->lut_obd;
2092         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2093         int wake_up = 0, connected, completed, queue_len;
2094         __u64 req_transno = 0;
2095         __u64 update_transno = 0;
2096         __u64 next_transno = 0;
2097
2098         ENTRY;
2099
2100         spin_lock(&obd->obd_recovery_task_lock);
2101         if (!list_empty(&obd->obd_req_replay_queue)) {
2102                 req = list_entry(obd->obd_req_replay_queue.next,
2103                                      struct ptlrpc_request, rq_list);
2104                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
2105         }
2106
2107         if (!obd->obd_abort_recov_mdt && tdtd)
2108                 update_transno = distribute_txn_get_next_transno(tdtd);
2109
2110         connected = atomic_read(&obd->obd_connected_clients);
2111         completed = connected - atomic_read(&obd->obd_req_replay_clients);
2112         queue_len = obd->obd_requests_queued_for_recovery;
2113         next_transno = obd->obd_next_recovery_transno;
2114
2115         CDEBUG(D_HA,
2116                "max: %d, connected: %d, completed: %d, queue_len: %d, req_transno: %llu, next_transno: %llu\n",
2117                atomic_read(&obd->obd_max_recoverable_clients),
2118                connected, completed,
2119                queue_len, req_transno, next_transno);
2120
2121         if (obd->obd_abort_recovery) {
2122                 CDEBUG(D_HA, "waking for aborted recovery\n");
2123                 wake_up = 1;
2124         } else if (obd->obd_recovery_expired) {
2125                 CDEBUG(D_HA, "waking for expired recovery\n");
2126                 wake_up = 1;
2127         } else if (!obd->obd_abort_recov_mdt && tdtd && req &&
2128                    is_req_replayed_by_update(req)) {
2129                 LASSERTF(req_transno < next_transno,
2130                          "req_transno %llu next_transno%llu\n", req_transno,
2131                          next_transno);
2132                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
2133                        req_transno);
2134                 wake_up = 1;
2135         } else if (req_transno == next_transno ||
2136                    (update_transno != 0 && update_transno <= next_transno)) {
2137                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
2138                 wake_up = 1;
2139         } else if (queue_len > 0 &&
2140                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
2141                 /** handle gaps occured due to lost reply or VBR */
2142                 LASSERTF(req_transno >= next_transno,
2143                          "req_transno: %llu, next_transno: %llu\n",
2144                          req_transno, next_transno);
2145                 CDEBUG(D_HA,
2146                        "%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",
2147                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
2148                        next_transno, queue_len, completed, connected,
2149                        req_transno, update_transno, obd->obd_last_committed);
2150                 obd->obd_next_recovery_transno = req_transno;
2151                 wake_up = 1;
2152         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
2153                 CDEBUG(D_HA, "waking for completed recovery\n");
2154                 wake_up = 1;
2155         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
2156                 CDEBUG(D_HA,
2157                        "accepting transno gaps is explicitly allowed by fail_lock, waking up (%lld)\n",
2158                        next_transno);
2159                 obd->obd_next_recovery_transno = req_transno;
2160                 wake_up = 1;
2161         }
2162         spin_unlock(&obd->obd_recovery_task_lock);
2163         return wake_up;
2164 }
2165
2166 static int check_for_next_lock(struct lu_target *lut)
2167 {
2168         struct obd_device *obd = lut->lut_obd;
2169         int wake_up = 0;
2170
2171         spin_lock(&obd->obd_recovery_task_lock);
2172         if (!list_empty(&obd->obd_lock_replay_queue)) {
2173                 CDEBUG(D_HA, "waking for next lock\n");
2174                 wake_up = 1;
2175         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
2176                 CDEBUG(D_HA, "waking for completed lock replay\n");
2177                 wake_up = 1;
2178         } else if (obd->obd_abort_recovery) {
2179                 CDEBUG(D_HA, "waking for aborted recovery\n");
2180                 wake_up = 1;
2181         } else if (obd->obd_recovery_expired) {
2182                 CDEBUG(D_HA, "waking for expired recovery\n");
2183                 wake_up = 1;
2184         }
2185         spin_unlock(&obd->obd_recovery_task_lock);
2186
2187         return wake_up;
2188 }
2189
2190 static int check_update_llog(struct lu_target *lut)
2191 {
2192         struct obd_device *obd = lut->lut_obd;
2193         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2194
2195         if (obd->obd_abort_recovery) {
2196                 CDEBUG(D_HA, "waking for aborted recovery\n");
2197                 return 1;
2198         }
2199
2200         if (atomic_read(&tdtd->tdtd_recovery_threads_count) == 0) {
2201                 CDEBUG(D_HA, "waking for completion of reading update log\n");
2202                 return 1;
2203         }
2204
2205         return 0;
2206 }
2207
2208 /**
2209  * wait for recovery events,
2210  * check its status with help of check_routine
2211  * evict dead clients via health_check
2212  */
2213 static int target_recovery_overseer(struct lu_target *lut,
2214                                     int (*check_routine)(struct lu_target *),
2215                                     int (*health_check)(struct obd_export *))
2216 {
2217         struct obd_device *obd = lut->lut_obd;
2218         struct target_distribute_txn_data *tdtd;
2219         time64_t last = 0;
2220         time64_t now;
2221 repeat:
2222         if (obd->obd_recovering && obd->obd_recovery_start == 0) {
2223                 now = ktime_get_seconds();
2224                 if (now - last > 600) {
2225                         LCONSOLE_INFO("%s: in recovery but waiting for the first client to connect\n",
2226                                       obd->obd_name);
2227                         last = now;
2228                 }
2229         }
2230         if (obd->obd_recovery_start != 0 && ktime_get_seconds() >=
2231               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
2232                 __u64 next_update_transno = 0;
2233
2234                 /*
2235                  * Only abort the recovery if there are no update recovery
2236                  * left in the queue
2237                  */
2238                 spin_lock(&obd->obd_recovery_task_lock);
2239                 if (!obd->obd_abort_recov_mdt && lut->lut_tdtd) {
2240                         next_update_transno =
2241                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2242
2243                         tdtd = lut->lut_tdtd;
2244                         /*
2245                          * If next_update_transno == 0, it probably because
2246                          * updatelog retrieve threads did not get any records
2247                          * yet, let's wait those threads stopped
2248                          */
2249                         if (next_update_transno == 0) {
2250                                 spin_unlock(&obd->obd_recovery_task_lock);
2251
2252                                 while (wait_event_timeout(
2253                                         tdtd->tdtd_recovery_threads_waitq,
2254                                         check_update_llog(lut),
2255                                         cfs_time_seconds(60)) == 0);
2256
2257                                 spin_lock(&obd->obd_recovery_task_lock);
2258                                 next_update_transno =
2259                                         distribute_txn_get_next_transno(tdtd);
2260                         }
2261                 }
2262
2263                 if (next_update_transno != 0 && !obd->obd_abort_recovery) {
2264                         obd->obd_next_recovery_transno = next_update_transno;
2265                         spin_unlock(&obd->obd_recovery_task_lock);
2266                         /*
2267                          * Disconnect unfinished exports from clients, and
2268                          * keep connection from MDT to make sure the update
2269                          * recovery will still keep trying until some one
2270                          * manually abort the recovery
2271                          */
2272                         class_disconnect_stale_exports(obd,
2273                                                 exp_finished_or_from_mdt);
2274                         /* Abort all of replay & replay lock req from clients */
2275                         abort_req_replay_queue(obd);
2276                         abort_lock_replay_queue(obd);
2277                         CDEBUG(D_HA,
2278                                "%s: there are still update replay (%#llx)in the queue.\n",
2279                                obd->obd_name, next_update_transno);
2280                 } else {
2281                         obd->obd_abort_recovery = 1;
2282                         spin_unlock(&obd->obd_recovery_task_lock);
2283                         CWARN("%s recovery is aborted by hard timeout\n",
2284                               obd->obd_name);
2285                 }
2286         }
2287
2288         while (wait_event_timeout(obd->obd_next_transno_waitq,
2289                                   check_routine(lut),
2290                                   cfs_time_seconds(60)) == 0)
2291                 ; /* wait indefinitely for event, but don't trigger watchdog */
2292
2293         if (obd->obd_abort_recovery) {
2294                 CWARN("recovery is aborted, evict exports in recovery\n");
2295                 if (lut->lut_tdtd != NULL) {
2296                         tdtd = lut->lut_tdtd;
2297                         /*
2298                          * Let's wait all of the update log recovery thread
2299                          * finished
2300                          */
2301                         wait_event_idle(
2302                                 tdtd->tdtd_recovery_threads_waitq,
2303                                 atomic_read(&tdtd->tdtd_recovery_threads_count)
2304                                 == 0);
2305                         /* Then abort the update recovery list */
2306                         dtrq_list_destroy(lut->lut_tdtd);
2307                 }
2308
2309                 /** evict exports which didn't finish recovery yet */
2310                 class_disconnect_stale_exports(obd, exp_finished);
2311                 return 1;
2312         } else if (obd->obd_recovery_expired) {
2313                 obd->obd_recovery_expired = 0;
2314
2315                 /** If some clients died being recovered, evict them */
2316                 LCONSOLE_WARN("%s: recovery is timed out, evict stale exports\n",
2317                               obd->obd_name);
2318                 /** evict cexports with no replay in queue, they are stalled */
2319                 class_disconnect_stale_exports(obd, health_check);
2320
2321                 /** continue with VBR */
2322                 spin_lock(&obd->obd_dev_lock);
2323                 obd->obd_version_recov = 1;
2324                 spin_unlock(&obd->obd_dev_lock);
2325                 /**
2326                  * reset timer, recovery will proceed with versions now,
2327                  * timeout is set just to handle reconnection delays
2328                  */
2329                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2330                 /**
2331                  * Wait for recovery events again, after evicting bad clients
2332                  */
2333                 goto repeat;
2334         }
2335         return 0;
2336 }
2337
2338 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2339 {
2340         struct obd_device *obd = lut->lut_obd;
2341         struct ptlrpc_request *req = NULL;
2342
2343         CDEBUG(D_HA, "Waiting for lock\n");
2344         if (target_recovery_overseer(lut, check_for_next_lock,
2345                                      exp_lock_replay_healthy))
2346                 abort_lock_replay_queue(obd);
2347
2348         spin_lock(&obd->obd_recovery_task_lock);
2349         if (!list_empty(&obd->obd_lock_replay_queue)) {
2350                 req = list_entry(obd->obd_lock_replay_queue.next,
2351                                      struct ptlrpc_request, rq_list);
2352                 list_del_init(&req->rq_list);
2353                 spin_unlock(&obd->obd_recovery_task_lock);
2354         } else {
2355                 spin_unlock(&obd->obd_recovery_task_lock);
2356                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2357                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2358                 /** evict exports failed VBR */
2359                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2360         }
2361         return req;
2362 }
2363
2364 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2365 {
2366         struct ptlrpc_request *req = NULL;
2367
2368         spin_lock(&obd->obd_recovery_task_lock);
2369         if (!list_empty(&obd->obd_final_req_queue)) {
2370                 req = list_entry(obd->obd_final_req_queue.next,
2371                                      struct ptlrpc_request, rq_list);
2372                 list_del_init(&req->rq_list);
2373                 spin_unlock(&obd->obd_recovery_task_lock);
2374                 if (req->rq_export->exp_in_recovery) {
2375                         spin_lock(&req->rq_export->exp_lock);
2376                         req->rq_export->exp_in_recovery = 0;
2377                         spin_unlock(&req->rq_export->exp_lock);
2378                 }
2379         } else {
2380                 spin_unlock(&obd->obd_recovery_task_lock);
2381         }
2382         return req;
2383 }
2384
2385 static void handle_recovery_req(struct ptlrpc_thread *thread,
2386                                 struct ptlrpc_request *req,
2387                                 svc_handler_t handler)
2388 {
2389         ENTRY;
2390
2391         /**
2392          * export can be evicted during recovery, no need to handle replays for
2393          * it after that, discard such request silently
2394          */
2395         if (req->rq_export->exp_disconnected)
2396                 RETURN_EXIT;
2397
2398         req->rq_session.lc_thread = thread;
2399         req->rq_svc_thread = thread;
2400         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2401
2402         /* thread context */
2403         lu_context_enter(&thread->t_env->le_ctx);
2404         (void)handler(req);
2405         lu_context_exit(&thread->t_env->le_ctx);
2406
2407         req->rq_svc_thread->t_env->le_ses = NULL;
2408
2409         /* don't reset timer for final stage */
2410         if (!exp_finished(req->rq_export)) {
2411                 timeout_t timeout = obd_timeout;
2412
2413                 /**
2414                  * Add request @timeout to the recovery time so next request from
2415                  * this client may come in recovery time
2416                  */
2417                 if (!AT_OFF) {
2418                         struct ptlrpc_service_part *svcpt;
2419                         timeout_t est_timeout;
2420
2421                         svcpt = req->rq_rqbd->rqbd_svcpt;
2422                         /*
2423                          * If the server sent early reply for this request,
2424                          * the client will recalculate the timeout according to
2425                          * current server estimate service time, so we will
2426                          * use the maxium timeout here for waiting the client
2427                          * sending the next req
2428                          */
2429                         est_timeout = at_get(&svcpt->scp_at_estimate);
2430                         timeout = max_t(timeout_t, at_est2timeout(est_timeout),
2431                                         lustre_msg_get_timeout(req->rq_reqmsg));
2432                         /*
2433                          * Add 2 net_latency, one for balance rq_deadline
2434                          * (see ptl_send_rpc), one for resend the req to server,
2435                          * Note: client will pack net_latency in replay req
2436                          * (see ptlrpc_replay_req)
2437                          */
2438                         timeout += 2 * lustre_msg_get_service_timeout(req->rq_reqmsg);
2439                 }
2440                 extend_recovery_timer(class_exp2obd(req->rq_export), timeout,
2441                                       true);
2442         }
2443         EXIT;
2444 }
2445
2446 /** Checking routines for recovery */
2447 static int check_for_recovery_ready(struct lu_target *lut)
2448 {
2449         struct obd_device *obd = lut->lut_obd;
2450         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2451
2452         CDEBUG(D_HA,
2453                "connected %d stale %d max_recoverable_clients %d abort %d expired %d\n",
2454                clnts, obd->obd_stale_clients,
2455                atomic_read(&obd->obd_max_recoverable_clients),
2456                obd->obd_abort_recovery, obd->obd_recovery_expired);
2457
2458         if (!obd->obd_abort_recovery && !obd->obd_recovery_expired) {
2459                 LASSERT(clnts <=
2460                         atomic_read(&obd->obd_max_recoverable_clients));
2461                 if (clnts + obd->obd_stale_clients <
2462                     atomic_read(&obd->obd_max_recoverable_clients))
2463                         return 0;
2464         }
2465
2466         if (!obd->obd_abort_recov_mdt && lut->lut_tdtd != NULL) {
2467                 if (!lut->lut_tdtd->tdtd_replay_ready &&
2468                     !obd->obd_abort_recovery && !obd->obd_stopping) {
2469                         /*
2470                          * Let's extend recovery timer, in case the recovery
2471                          * timer expired, and some clients got evicted
2472                          */
2473                         extend_recovery_timer(obd, obd->obd_recovery_timeout,
2474                                               true);
2475                         CDEBUG(D_HA,
2476                                "%s update recovery is not ready, extend recovery %d\n",
2477                                obd->obd_name, obd->obd_recovery_timeout);
2478                         return 0;
2479                 }
2480         }
2481
2482         return 1;
2483 }
2484
2485 enum {
2486         REQUEST_RECOVERY = 1,
2487         UPDATE_RECOVERY = 2,
2488 };
2489
2490 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2491 {
2492         __u64 transno = 0;
2493
2494         if (!list_empty(&obd->obd_req_replay_queue)) {
2495                 struct ptlrpc_request *req;
2496
2497                 req = list_entry(obd->obd_req_replay_queue.next,
2498                                  struct ptlrpc_request, rq_list);
2499                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2500         }
2501
2502         return transno;
2503 }
2504
2505 static __u64 get_next_transno(struct lu_target *lut, int *type)
2506 {
2507         struct obd_device *obd = lut->lut_obd;
2508         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2509         __u64 transno = 0;
2510         __u64 update_transno;
2511
2512         ENTRY;
2513
2514         transno = get_next_replay_req_transno(obd);
2515         if (type != NULL)
2516                 *type = REQUEST_RECOVERY;
2517
2518         if (!tdtd || obd->obd_abort_recov_mdt)
2519                 RETURN(transno);
2520
2521         update_transno = distribute_txn_get_next_transno(tdtd);
2522         if (transno == 0 || (transno >= update_transno &&
2523                              update_transno != 0)) {
2524                 transno = update_transno;
2525                 if (type != NULL)
2526                         *type = UPDATE_RECOVERY;
2527         }
2528
2529         RETURN(transno);
2530 }
2531
2532 /**
2533  * drop duplicate replay request
2534  *
2535  * Because the operation has been replayed by update recovery, the request
2536  * with the same transno will be dropped and also notify the client to send
2537  * next replay request.
2538  *
2539  * \param[in] env       execution environment
2540  * \param[in] obd       failover obd device
2541  * \param[in] req       request to be dropped
2542  */
2543 static void drop_duplicate_replay_req(struct lu_env *env,
2544                                       struct obd_device *obd,
2545                                       struct ptlrpc_request *req)
2546 {
2547         DEBUG_REQ(D_HA, req,
2548                   "remove t%lld from %s because duplicate update records found",
2549                   lustre_msg_get_transno(req->rq_reqmsg),
2550                   libcfs_nidstr(&req->rq_peer.nid));
2551
2552         /*
2553          * Right now, only for MDS reint operation update replay and
2554          * normal request replay can have the same transno
2555          */
2556         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT) {
2557                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2558                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2559                 if (likely(req->rq_export))
2560                         target_committed_to_req(req);
2561                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2562                 target_send_reply(req, req->rq_status, 0);
2563         } else {
2564                 DEBUG_REQ(D_ERROR, req, "wrong opc from %s",
2565                 libcfs_nidstr(&req->rq_peer.nid));
2566         }
2567         target_exp_dequeue_req_replay(req);
2568         target_request_copy_put(req);
2569         obd->obd_replayed_requests++;
2570 }
2571
2572 #define WATCHDOG_TIMEOUT (obd_timeout * 10)
2573
2574 static void replay_request_or_update(struct lu_env *env,
2575                                      struct lu_target *lut,
2576                                      struct target_recovery_data *trd,
2577                                      struct ptlrpc_thread *thread)
2578 {
2579         struct obd_device *obd = lut->lut_obd;
2580         struct ptlrpc_request *req = NULL;
2581         int type;
2582         __u64 transno;
2583
2584         ENTRY;
2585
2586         CDEBUG(D_HA, "Waiting for transno %lld\n",
2587                obd->obd_next_recovery_transno);
2588
2589         /* Replay all of request and update by transno */
2590         do {
2591                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2592
2593                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2594
2595                 /**
2596                  * It is needed to extend recovery window above
2597                  *  recovery_time_soft. Extending is possible only in the
2598                  *  end of recovery window (see more details in
2599                  *  handle_recovery_req()).
2600                  */
2601                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2602
2603                 if (target_recovery_overseer(lut, check_for_next_transno,
2604                                         exp_req_replay_healthy_or_from_mdt)) {
2605                         abort_req_replay_queue(obd);
2606                         abort_lock_replay_queue(obd);
2607                         goto abort;
2608                 }
2609
2610                 spin_lock(&obd->obd_recovery_task_lock);
2611                 transno = get_next_transno(lut, &type);
2612                 if (type == REQUEST_RECOVERY && transno != 0) {
2613                         /*
2614                          * Drop replay request from client side, if the
2615                          * replay has been executed by update with the
2616                          * same transno
2617                          */
2618                         req = list_entry(obd->obd_req_replay_queue.next,
2619                                         struct ptlrpc_request, rq_list);
2620
2621                         list_del_init(&req->rq_list);
2622                         obd->obd_requests_queued_for_recovery--;
2623                         spin_unlock(&obd->obd_recovery_task_lock);
2624
2625                         /*
2626                          * Let's check if the request has been redone by
2627                          * update replay
2628                          */
2629                         if (is_req_replayed_by_update(req)) {
2630                                 struct distribute_txn_replay_req *dtrq;
2631
2632                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2633                                                                       transno);
2634                                 LASSERT(dtrq != NULL);
2635                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2636                                 list_del_init(&dtrq->dtrq_list);
2637                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2638                                 dtrq_destroy(dtrq);
2639
2640                                 drop_duplicate_replay_req(env, obd, req);
2641
2642                                 continue;
2643                         }
2644
2645                         LASSERT(trd->trd_processing_task == current->pid);
2646                         DEBUG_REQ(D_HA, req, "processing x%llu t%lld from %s",
2647                                   req->rq_xid,
2648                                   lustre_msg_get_transno(req->rq_reqmsg),
2649                                   libcfs_nidstr(&req->rq_peer.nid));
2650
2651                         ptlrpc_watchdog_init(&thread->t_watchdog,
2652                                              WATCHDOG_TIMEOUT);
2653                         handle_recovery_req(thread, req,
2654                                             trd->trd_recovery_handler);
2655                         ptlrpc_watchdog_disable(&thread->t_watchdog);
2656
2657                         /**
2658                          * bz18031: increase next_recovery_transno before
2659                          * target_request_copy_put() will drop exp_rpc reference
2660                          */
2661                         spin_lock(&obd->obd_recovery_task_lock);
2662                         obd->obd_next_recovery_transno++;
2663                         spin_unlock(&obd->obd_recovery_task_lock);
2664                         target_exp_dequeue_req_replay(req);
2665                         target_request_copy_put(req);
2666                         obd->obd_replayed_requests++;
2667                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2668                         struct distribute_txn_replay_req *dtrq;
2669                         int rc;
2670
2671                         spin_unlock(&obd->obd_recovery_task_lock);
2672
2673                         LASSERT(tdtd != NULL);
2674                         dtrq = distribute_txn_get_next_req(tdtd);
2675                         lu_context_enter(&thread->t_env->le_ctx);
2676                         ptlrpc_watchdog_init(&thread->t_watchdog,
2677                                              WATCHDOG_TIMEOUT);
2678                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2679                         ptlrpc_watchdog_disable(&thread->t_watchdog);
2680                         lu_context_exit(&thread->t_env->le_ctx);
2681                         extend_recovery_timer(obd, obd_timeout, true);
2682
2683                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2684                                 CDEBUG(D_HA,
2685                                        "Move x%llu t%llu to finish list\n",
2686                                        dtrq->dtrq_xid,
2687                                        dtrq->dtrq_master_transno);
2688
2689                                 /* Add it to the replay finish list */
2690                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2691                                 list_add(&dtrq->dtrq_list,
2692                                          &tdtd->tdtd_replay_finish_list);
2693                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2694
2695                                 spin_lock(&obd->obd_recovery_task_lock);
2696                                 if (transno == obd->obd_next_recovery_transno)
2697                                         obd->obd_next_recovery_transno++;
2698                                 else if (transno >
2699                                          obd->obd_next_recovery_transno)
2700                                         obd->obd_next_recovery_transno =
2701                                                                 transno + 1;
2702                                 spin_unlock(&obd->obd_recovery_task_lock);
2703                         } else {
2704                                 dtrq_destroy(dtrq);
2705                         }
2706                 } else {
2707                         spin_unlock(&obd->obd_recovery_task_lock);
2708 abort:
2709                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2710                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2711                         /** evict exports failed VBR */
2712                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2713                         break;
2714                 }
2715         } while (1);
2716 }
2717
2718 static int target_recovery_thread(void *arg)
2719 {
2720         struct lu_target *lut = arg;
2721         struct obd_device *obd = lut->lut_obd;
2722         struct ptlrpc_request *req;
2723         struct target_recovery_data *trd = &obd->obd_recovery_data;
2724         unsigned long delta;
2725         struct lu_env *env;
2726         struct ptlrpc_thread *thread = NULL;
2727         int rc = 0;
2728
2729         ENTRY;
2730         unshare_fs_struct();
2731         OBD_ALLOC_PTR(thread);
2732         if (thread == NULL)
2733                 RETURN(-ENOMEM);
2734
2735         OBD_ALLOC_PTR(env);
2736         if (env == NULL)
2737                 GOTO(out_thread, rc = -ENOMEM);
2738         rc = lu_env_add(env);
2739         if (rc)
2740                 GOTO(out_env, rc);
2741
2742         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2743         if (rc)
2744                 GOTO(out_env_remove, rc);
2745
2746         thread->t_env = env;
2747         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2748         thread->t_task = current;
2749         env->le_ctx.lc_thread = thread;
2750         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2751
2752         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2753                current->pid);
2754         trd->trd_processing_task = current->pid;
2755
2756         spin_lock(&obd->obd_dev_lock);
2757         obd->obd_recovering = 1;
2758         spin_unlock(&obd->obd_dev_lock);
2759         complete(&trd->trd_starting);
2760
2761         /* first of all, we have to know the first transno to replay */
2762         if (target_recovery_overseer(lut, check_for_recovery_ready,
2763                                      exp_connect_healthy)) {
2764                 abort_req_replay_queue(obd);
2765                 abort_lock_replay_queue(obd);
2766                 if (lut->lut_tdtd != NULL)
2767                         dtrq_list_destroy(lut->lut_tdtd);
2768         }
2769
2770         /* next stage: replay requests or update */
2771         delta = jiffies;
2772         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2773                atomic_read(&obd->obd_req_replay_clients),
2774                obd->obd_next_recovery_transno);
2775         replay_request_or_update(env, lut, trd, thread);
2776
2777         /**
2778          * The second stage: replay locks
2779          */
2780         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2781                atomic_read(&obd->obd_lock_replay_clients));
2782         while ((req = target_next_replay_lock(lut))) {
2783                 LASSERT(trd->trd_processing_task == current->pid);
2784                 DEBUG_REQ(D_HA, req, "processing lock from %s:",
2785                           libcfs_nidstr(&req->rq_peer.nid));
2786                 if (OBD_FAIL_CHECK(OBD_FAIL_LDLM_LOCK_REPLAY)) {
2787                         req->rq_status = -ENODEV;
2788                         target_request_copy_put(req);
2789                         continue;
2790                 }
2791                 handle_recovery_req(thread, req,
2792                                     trd->trd_recovery_handler);
2793                 target_request_copy_put(req);
2794                 obd->obd_replayed_locks++;
2795         }
2796
2797         /**
2798          * The third stage: reply on final pings, at this moment all clients
2799          * must have request in final queue
2800          */
2801         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2802         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2803         /** Update server last boot epoch */
2804         tgt_boot_epoch_update(lut);
2805         /*
2806          * We drop recoverying flag to forward all new requests
2807          * to regular mds_handle() since now
2808          */
2809         spin_lock(&obd->obd_dev_lock);
2810         obd->obd_recovering = obd->obd_abort_recovery = 0;
2811         obd->obd_abort_recov_mdt = 0;
2812         spin_unlock(&obd->obd_dev_lock);
2813         spin_lock(&obd->obd_recovery_task_lock);
2814         target_cancel_recovery_timer(obd);
2815         spin_unlock(&obd->obd_recovery_task_lock);
2816         while ((req = target_next_final_ping(obd))) {
2817                 LASSERT(trd->trd_processing_task == current->pid);
2818                 DEBUG_REQ(D_HA, req, "processing final ping from %s:",
2819                           libcfs_nidstr(&req->rq_peer.nid));
2820                 handle_recovery_req(thread, req,
2821                                     trd->trd_recovery_handler);
2822                 /*
2823                  * Because the waiting client can not send ping to server,
2824                  * so we need refresh the last_request_time, to avoid the
2825                  * export is being evicted
2826                  */
2827                 ptlrpc_update_export_timer(req->rq_export, 0);
2828                 target_request_copy_put(req);
2829         }
2830
2831         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2832         CDEBUG(D_INFO, "4: recovery completed in %lus - %d/%d reqs/locks\n",
2833                delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2834         if (delta > OBD_RECOVERY_TIME_SOFT) {
2835                 CWARN("too long recovery - read logs\n");
2836                 libcfs_debug_dumplog();
2837         }
2838
2839         target_finish_recovery(lut);
2840         lu_context_fini(&env->le_ctx);
2841         trd->trd_processing_task = 0;
2842         complete_all(&trd->trd_finishing);
2843         tgt_io_thread_done(thread);
2844 out_env_remove:
2845         lu_env_remove(env);
2846 out_env:
2847         OBD_FREE_PTR(env);
2848 out_thread:
2849         OBD_FREE_PTR(thread);
2850         RETURN(rc);
2851 }
2852
2853 static int target_start_recovery_thread(struct lu_target *lut,
2854                                         svc_handler_t handler)
2855 {
2856         struct obd_device *obd = lut->lut_obd;
2857         int rc = 0;
2858         struct target_recovery_data *trd = &obd->obd_recovery_data;
2859         int index;
2860
2861         memset(trd, 0, sizeof(*trd));
2862         init_completion(&trd->trd_starting);
2863         init_completion(&trd->trd_finishing);
2864         trd->trd_recovery_handler = handler;
2865
2866         rc = server_name2index(obd->obd_name, &index, NULL);
2867         if (rc < 0)
2868                 return rc;
2869
2870         if (!IS_ERR(kthread_run(target_recovery_thread,
2871                                 lut, "tgt_recover_%d", index))) {
2872                 wait_for_completion(&trd->trd_starting);
2873                 LASSERT(obd->obd_recovering != 0);
2874         } else {
2875                 rc = -ECHILD;
2876         }
2877
2878         return rc;
2879 }
2880
2881 void target_stop_recovery_thread(struct obd_device *obd)
2882 {
2883         if (obd->obd_recovery_data.trd_processing_task > 0) {
2884                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2885                 /** recovery can be done but postrecovery is not yet */
2886                 spin_lock(&obd->obd_dev_lock);
2887                 if (obd->obd_recovering) {
2888                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2889                         obd->obd_abort_recovery = 1;
2890                         wake_up(&obd->obd_next_transno_waitq);
2891                 }
2892                 spin_unlock(&obd->obd_dev_lock);
2893                 wait_for_completion(&trd->trd_finishing);
2894         }
2895 }
2896 EXPORT_SYMBOL(target_stop_recovery_thread);
2897
2898 void target_recovery_fini(struct obd_device *obd)
2899 {
2900         class_disconnect_exports(obd);
2901         target_stop_recovery_thread(obd);
2902         target_cleanup_recovery(obd);
2903 }
2904 EXPORT_SYMBOL(target_recovery_fini);
2905
2906 static enum hrtimer_restart target_recovery_expired(struct hrtimer *timer)
2907 {
2908         struct obd_device *obd = container_of(timer, struct obd_device,
2909                                               obd_recovery_timer);
2910
2911         CDEBUG(D_HA,
2912                "%s: recovery timed out; %d clients are still in recovery after %llu seconds (%d clients connected)\n",
2913                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2914                ktime_get_seconds() - obd->obd_recovery_start,
2915                atomic_read(&obd->obd_connected_clients));
2916
2917         obd->obd_recovery_expired = 1;
2918         wake_up(&obd->obd_next_transno_waitq);
2919         return HRTIMER_NORESTART;
2920 }
2921
2922 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2923 {
2924         struct obd_device *obd = lut->lut_obd;
2925
2926         if (lut->lut_bottom->dd_rdonly)
2927                 return;
2928
2929         if (atomic_read(&obd->obd_max_recoverable_clients) == 0) {
2930                 /** Update server last boot epoch */
2931                 tgt_boot_epoch_update(lut);
2932                 return;
2933         }
2934
2935         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2936                "last_transno %llu\n", obd->obd_name,
2937                atomic_read(&obd->obd_max_recoverable_clients),
2938                obd->obd_last_committed);
2939         LASSERT(obd->obd_stopping == 0);
2940         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2941         obd->obd_recovery_start = 0;
2942         obd->obd_recovery_end = 0;
2943
2944         hrtimer_init(&obd->obd_recovery_timer, CLOCK_MONOTONIC,
2945                      HRTIMER_MODE_ABS);
2946         obd->obd_recovery_timer.function = &target_recovery_expired;
2947         target_start_recovery_thread(lut, handler);
2948 }
2949 EXPORT_SYMBOL(target_recovery_init);
2950
2951 static int target_process_req_flags(struct obd_device *obd,
2952                                     struct ptlrpc_request *req)
2953 {
2954         struct obd_export *exp = req->rq_export;
2955
2956         LASSERT(exp != NULL);
2957         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2958                 /* client declares he's ready to replay locks */
2959                 spin_lock(&exp->exp_lock);
2960                 if (exp->exp_req_replay_needed) {
2961                         exp->exp_req_replay_needed = 0;
2962                         spin_unlock(&exp->exp_lock);
2963
2964                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2965                         atomic_dec(&obd->obd_req_replay_clients);
2966                 } else {
2967                         spin_unlock(&exp->exp_lock);
2968                 }
2969         }
2970         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2971                 /*
2972                  * client declares he's ready to complete recovery
2973                  * so, we put the request on th final queue
2974                  */
2975                 spin_lock(&exp->exp_lock);
2976                 if (exp->exp_lock_replay_needed) {
2977                         exp->exp_lock_replay_needed = 0;
2978                         spin_unlock(&exp->exp_lock);
2979
2980                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
2981                         atomic_dec(&obd->obd_lock_replay_clients);
2982                 } else {
2983                         spin_unlock(&exp->exp_lock);
2984                 }
2985         }
2986         return 0;
2987 }
2988
2989 int target_queue_recovery_request(struct ptlrpc_request *req,
2990                                   struct obd_device *obd)
2991 {
2992         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
2993         struct ptlrpc_request *reqiter;
2994         int inserted = 0;
2995
2996         ENTRY;
2997
2998         if (obd->obd_recovery_data.trd_processing_task == current->pid) {
2999                 /* Processing the queue right now, don't re-add. */
3000                 RETURN(1);
3001         }
3002
3003         target_process_req_flags(obd, req);
3004
3005         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
3006                 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
3007                         if (cfs_fail_val == 1) {
3008                                 cfs_race_state = 1;
3009                                 cfs_fail_val = 0;
3010                                 wake_up(&cfs_race_waitq);
3011
3012                                 schedule_timeout_interruptible(
3013                                         cfs_time_seconds(1));
3014                         }
3015                 }
3016
3017                 /*
3018                  * client declares he's ready to complete recovery
3019                  * so, we put the request on th final queue
3020                  */
3021                 target_request_copy_get(req);
3022                 DEBUG_REQ(D_HA, req, "queue final req");
3023                 wake_up(&obd->obd_next_transno_waitq);
3024                 spin_lock(&obd->obd_recovery_task_lock);
3025                 if (obd->obd_recovering) {
3026                         struct ptlrpc_request *tmp;
3027                         struct ptlrpc_request *duplicate = NULL;
3028
3029                         if (likely(!req->rq_export->exp_replay_done)) {
3030                                 req->rq_export->exp_replay_done = 1;
3031                                 list_add_tail(&req->rq_list,
3032                                               &obd->obd_final_req_queue);
3033                                 spin_unlock(&obd->obd_recovery_task_lock);
3034                                 RETURN(0);
3035                         }
3036
3037                         /*
3038                          * XXX O(n), but only happens if final ping is
3039                          * timed out, probably reorganize the list as
3040                          * a hash list later
3041                          */
3042                         list_for_each_entry_safe(reqiter, tmp,
3043                                                  &obd->obd_final_req_queue,
3044                                                  rq_list) {
3045                                 if (reqiter->rq_export == req->rq_export) {
3046                                         list_del_init(&reqiter->rq_list);
3047                                         duplicate = reqiter;
3048                                         break;
3049                                 }
3050                         }
3051
3052                         list_add_tail(&req->rq_list,
3053                                       &obd->obd_final_req_queue);
3054                         req->rq_export->exp_replay_done = 1;
3055                         spin_unlock(&obd->obd_recovery_task_lock);
3056
3057                         if (duplicate != NULL) {
3058                                 DEBUG_REQ(D_HA, duplicate,
3059                                           "put prev final req");
3060                                 target_request_copy_put(duplicate);
3061                         }
3062                         RETURN(0);
3063                 } else {
3064                         spin_unlock(&obd->obd_recovery_task_lock);
3065                         target_request_copy_put(req);
3066                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
3067                 }
3068         }
3069         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
3070                 /* client declares he's ready to replay locks */
3071                 target_request_copy_get(req);
3072                 DEBUG_REQ(D_HA, req, "queue lock replay req");
3073                 wake_up(&obd->obd_next_transno_waitq);
3074                 spin_lock(&obd->obd_recovery_task_lock);
3075                 LASSERT(obd->obd_recovering);
3076                 /* usually due to recovery abort */
3077                 if (!req->rq_export->exp_in_recovery) {
3078                         spin_unlock(&obd->obd_recovery_task_lock);
3079                         target_request_copy_put(req);
3080                         RETURN(-ENOTCONN);
3081                 }
3082                 LASSERT(req->rq_export->exp_lock_replay_needed);
3083                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
3084                 spin_unlock(&obd->obd_recovery_task_lock);
3085                 RETURN(0);
3086         }
3087
3088         /*
3089          * CAVEAT EMPTOR: The incoming request message has been swabbed
3090          * (i.e. buflens etc are in my own byte order), but type-dependent
3091          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed.
3092          */
3093
3094         if (!transno) {
3095                 INIT_LIST_HEAD(&req->rq_list);
3096                 DEBUG_REQ(D_HA, req, "not queueing");
3097                 RETURN(1);
3098         }
3099
3100         /*
3101          * If we're processing the queue, we want don't want to queue this
3102          * message.
3103          *
3104          * Also, if this request has a transno less than the one we're waiting
3105          * for, we should process it now.  It could (and currently always will)
3106          * be an open request for a descriptor that was opened some time ago.
3107          *
3108          * Also, a resent, replayed request that has already been
3109          * handled will pass through here and be processed immediately.
3110          */
3111         CDEBUG(D_HA,
3112                "Next recovery transno: %llu, current: %llu, replaying\n",
3113                obd->obd_next_recovery_transno, transno);
3114
3115         /*
3116          * If the request has been replayed by update replay, then sends this
3117          * request to the recovery thread (replay_request_or_update()), where
3118          * it will be handled
3119          */
3120         spin_lock(&obd->obd_recovery_task_lock);
3121         if (transno < obd->obd_next_recovery_transno &&
3122             !is_req_replayed_by_update(req)) {
3123                 /* Processing the queue right now, don't re-add. */
3124                 LASSERT(list_empty(&req->rq_list));
3125                 spin_unlock(&obd->obd_recovery_task_lock);
3126                 RETURN(1);
3127         }
3128         spin_unlock(&obd->obd_recovery_task_lock);
3129
3130         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
3131                 RETURN(0);
3132
3133         target_request_copy_get(req);
3134         if (!req->rq_export->exp_in_recovery) {
3135                 target_request_copy_put(req);
3136                 RETURN(-ENOTCONN);
3137         }
3138         LASSERT(req->rq_export->exp_req_replay_needed);
3139
3140         if (target_exp_enqueue_req_replay(req)) {
3141                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
3142                 target_request_copy_put(req);
3143                 RETURN(0);
3144         }
3145
3146         /* XXX O(n^2) */
3147         spin_lock(&obd->obd_recovery_task_lock);
3148         LASSERT(obd->obd_recovering);
3149         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
3150                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
3151                         list_add_tail(&req->rq_list, &reqiter->rq_list);
3152                         inserted = 1;
3153                         goto added;
3154                 }
3155
3156                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
3157                              transno)) {
3158                         DEBUG_REQ(D_ERROR, req,
3159                                   "dropping replay: transno has been claimed by another client");
3160                         spin_unlock(&obd->obd_recovery_task_lock);
3161                         target_exp_dequeue_req_replay(req);
3162                         target_request_copy_put(req);
3163                         RETURN(0);
3164                 }
3165         }
3166 added:
3167         if (!inserted)
3168                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
3169
3170         obd->obd_requests_queued_for_recovery++;
3171         spin_unlock(&obd->obd_recovery_task_lock);
3172         wake_up(&obd->obd_next_transno_waitq);
3173         RETURN(0);
3174 }
3175
3176 void target_committed_to_req(struct ptlrpc_request *req)
3177 {
3178         struct obd_export *exp = req->rq_export;
3179
3180         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
3181                 lustre_msg_set_last_committed(req->rq_repmsg,
3182                                               exp->exp_last_committed);
3183         else
3184                 DEBUG_REQ(D_IOCTL, req,
3185                           "not sending last_committed update (%d/%d)",
3186                           exp->exp_obd->obd_no_transno,
3187                           req->rq_repmsg == NULL);
3188
3189         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
3190                exp->exp_last_committed, req->rq_transno, req->rq_xid);
3191 }
3192
3193 #endif /* HAVE_SERVER_SUPPORT */
3194
3195 /**
3196  * Packs current SLV and Limit into \a req.
3197  */
3198 int target_pack_pool_reply(struct ptlrpc_request *req)
3199 {
3200         struct obd_device *obd;
3201
3202         ENTRY;
3203
3204         /*
3205          * Check that we still have all structures alive as this may
3206          * be some late RPC at shutdown time.
3207          */
3208         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
3209                      !exp_connect_lru_resize(req->rq_export))) {
3210                 lustre_msg_set_slv(req->rq_repmsg, 0);
3211                 lustre_msg_set_limit(req->rq_repmsg, 0);
3212                 RETURN(0);
3213         }
3214
3215         /* OBD is alive here as export is alive, which we checked above. */
3216         obd = req->rq_export->exp_obd;
3217
3218         read_lock(&obd->obd_pool_lock);
3219         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
3220         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
3221         read_unlock(&obd->obd_pool_lock);
3222
3223         RETURN(0);
3224 }
3225
3226 static int target_send_reply_msg(struct ptlrpc_request *req,
3227                                  int rc, int fail_id)
3228 {
3229         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
3230                 DEBUG_REQ(D_ERROR, req, "dropping reply");
3231                 return -ECOMM;
3232         }
3233         /*
3234          * We can have a null rq_reqmsg in the event of bad signature or
3235          * no context when unwrapping
3236          */
3237         if (req->rq_reqmsg &&
3238             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
3239             OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
3240                 return -ECOMM;
3241
3242         if (unlikely(rc)) {
3243                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
3244                 req->rq_status = rc;
3245                 return ptlrpc_send_error(req, 1);
3246         }
3247         DEBUG_REQ(D_NET, req, "sending reply");
3248
3249         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
3250 }
3251
3252 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
3253 {
3254         struct ptlrpc_service_part *svcpt;
3255         int netrc;
3256         struct ptlrpc_reply_state *rs;
3257         struct obd_export *exp;
3258
3259         ENTRY;
3260
3261         if (req->rq_no_reply) {
3262                 EXIT;
3263                 return;
3264         }
3265
3266         svcpt = req->rq_rqbd->rqbd_svcpt;
3267         rs = req->rq_reply_state;
3268         if (rs == NULL || !rs->rs_difficult) {
3269                 /* no notifiers */
3270                 target_send_reply_msg(req, rc, fail_id);
3271                 EXIT;
3272                 return;
3273         }
3274
3275         /* must be an export if locks saved */
3276         LASSERT(req->rq_export != NULL);
3277         /* req/reply consistent */
3278         LASSERT(rs->rs_svcpt == svcpt);
3279
3280         /* "fresh" reply */
3281         LASSERT(!rs->rs_scheduled);
3282         LASSERT(!rs->rs_scheduled_ever);
3283         LASSERT(!rs->rs_handled);
3284         LASSERT(!rs->rs_sent);
3285         LASSERT(!rs->rs_unlinked);
3286         LASSERT(rs->rs_export == NULL);
3287         LASSERT(list_empty(&rs->rs_obd_list));
3288         LASSERT(list_empty(&rs->rs_exp_list));
3289
3290         exp = class_export_get(req->rq_export);
3291
3292         /* disable reply scheduling while I'm setting up */
3293         rs->rs_scheduled = 1;
3294         rs->rs_sent      = 0;
3295         rs->rs_unlinked  = 0;
3296         rs->rs_xid       = req->rq_xid;
3297         rs->rs_transno   = req->rq_transno;
3298         rs->rs_export    = exp;
3299         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
3300
3301         spin_lock(&exp->exp_uncommitted_replies_lock);
3302         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
3303                rs->rs_transno, exp->exp_last_committed);
3304         if (rs->rs_transno > exp->exp_last_committed) {
3305                 /* not committed already */
3306                 list_add_tail(&rs->rs_obd_list,
3307                                   &exp->exp_uncommitted_replies);
3308         }
3309         spin_unlock(&exp->exp_uncommitted_replies_lock);
3310
3311         spin_lock(&exp->exp_lock);
3312         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
3313         spin_unlock(&exp->exp_lock);
3314
3315         netrc = target_send_reply_msg(req, rc, fail_id);
3316
3317         spin_lock(&svcpt->scp_rep_lock);
3318
3319         atomic_inc(&svcpt->scp_nreps_difficult);
3320
3321         if (netrc != 0) {
3322                 /*
3323                  * error sending: reply is off the net.  Also we need +1
3324                  * reply ref until ptlrpc_handle_rs() is done
3325                  * with the reply state (if the send was successful, there
3326                  * would have been +1 ref for the net, which
3327                  * reply_out_callback leaves alone)
3328                  */
3329                 rs->rs_sent = 1;
3330                 rs->rs_unlinked = 1;
3331                 ptlrpc_rs_addref(rs);
3332         }
3333
3334         spin_lock(&rs->rs_lock);
3335         if (rs->rs_transno <= exp->exp_last_committed ||
3336             (rs->rs_unlinked && !rs->rs_no_ack) ||
3337             list_empty(&rs->rs_exp_list) ||     /* completed already */
3338             list_empty(&rs->rs_obd_list)) {
3339                 CDEBUG(D_HA, "Schedule reply immediately\n");
3340                 ptlrpc_dispatch_difficult_reply(rs);
3341         } else {
3342                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
3343                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
3344         }
3345         spin_unlock(&rs->rs_lock);
3346         spin_unlock(&svcpt->scp_rep_lock);
3347         EXIT;
3348 }
3349
3350 enum ldlm_mode lck_compat_array[] = {
3351         [LCK_EX]    = LCK_COMPAT_EX,
3352         [LCK_PW]    = LCK_COMPAT_PW,
3353         [LCK_PR]    = LCK_COMPAT_PR,
3354         [LCK_CW]    = LCK_COMPAT_CW,
3355         [LCK_CR]    = LCK_COMPAT_CR,
3356         [LCK_NL]    = LCK_COMPAT_NL,
3357         [LCK_GROUP] = LCK_COMPAT_GROUP,
3358         [LCK_COS]   = LCK_COMPAT_COS,
3359 };
3360
3361 /**
3362  * Rather arbitrary mapping from LDLM error codes to errno values. This should
3363  * not escape to the user level.
3364  */
3365 int ldlm_error2errno(enum ldlm_error error)
3366 {
3367         int result;
3368
3369         switch (error) {
3370         case ELDLM_OK:
3371         case ELDLM_LOCK_MATCHED:
3372                 result = 0;
3373                 break;
3374         case ELDLM_LOCK_CHANGED:
3375                 result = -ESTALE;
3376                 break;
3377         case ELDLM_LOCK_ABORTED:
3378                 result = -ENAVAIL;
3379                 break;
3380         case ELDLM_LOCK_REPLACED:
3381                 result = -ESRCH;
3382                 break;
3383         case ELDLM_NO_LOCK_DATA:
3384                 result = -ENOENT;
3385                 break;
3386         case ELDLM_NAMESPACE_EXISTS:
3387                 result = -EEXIST;
3388                 break;
3389         case ELDLM_BAD_NAMESPACE:
3390                 result = -EBADF;
3391                 break;
3392         default:
3393                 if (((int)error) < 0) { /* cast to signed type */
3394                         result = error; /* as ldlm_error can be unsigned */
3395                 } else {
3396                         CERROR("Invalid DLM result code: %d\n", error);
3397                         result = -EPROTO;
3398                 }
3399         }
3400         return result;
3401 }
3402 EXPORT_SYMBOL(ldlm_error2errno);
3403
3404 /**
3405  * Dual to ldlm_error2errno(): maps errno values back to enum ldlm_error.
3406  */
3407 enum ldlm_error ldlm_errno2error(int err_no)
3408 {
3409         int error;
3410
3411         switch (err_no) {
3412         case 0:
3413                 error = ELDLM_OK;
3414                 break;
3415         case -ESTALE:
3416                 error = ELDLM_LOCK_CHANGED;
3417                 break;
3418         case -ENAVAIL:
3419                 error = ELDLM_LOCK_ABORTED;
3420                 break;
3421         case -ESRCH:
3422                 error = ELDLM_LOCK_REPLACED;
3423                 break;
3424         case -ENOENT:
3425                 error = ELDLM_NO_LOCK_DATA;
3426                 break;
3427         case -EEXIST:
3428                 error = ELDLM_NAMESPACE_EXISTS;
3429                 break;
3430         case -EBADF:
3431                 error = ELDLM_BAD_NAMESPACE;
3432                 break;
3433         default:
3434                 error = err_no;
3435         }
3436         return error;
3437 }
3438
3439 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3440 void ldlm_dump_export_locks(struct obd_export *exp)
3441 {
3442         spin_lock(&exp->exp_locks_list_guard);
3443         if (!list_empty(&exp->exp_locks_list)) {
3444                 struct ldlm_lock *lock;
3445
3446                 CERROR("dumping locks for export %p, ignore if the unmount doesn't hang\n",
3447                        exp);
3448                 list_for_each_entry(lock, &exp->exp_locks_list,
3449                                         l_exp_refs_link)
3450                         LDLM_ERROR(lock, "lock:");
3451         }
3452         spin_unlock(&exp->exp_locks_list_guard);
3453 }
3454 #endif
3455
3456 #ifdef HAVE_SERVER_SUPPORT
3457 static inline const char *bulk2type(struct ptlrpc_request *req)
3458 {
3459         if (req->rq_bulk_read)
3460                 return "READ";
3461         if (req->rq_bulk_write)
3462                 return "WRITE";
3463         return "UNKNOWN";
3464 }
3465
3466 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc)
3467 {
3468         struct ptlrpc_request *req = desc->bd_req;
3469         time64_t start = ktime_get_seconds();
3470         time64_t deadline;
3471         int rc = 0;
3472
3473         ENTRY;
3474
3475         /* If there is eviction in progress, wait for it to finish. */
3476         wait_event_idle(
3477                 exp->exp_obd->obd_evict_inprogress_waitq,
3478                 !atomic_read(&exp->exp_obd->obd_evict_inprogress));
3479
3480         /* Check if client was evicted or reconnected already. */
3481         if (exp->exp_failed ||
3482             exp->exp_conn_cnt > lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3483                 rc = -ENOTCONN;
3484         } else {
3485                 if (req->rq_bulk_read)
3486                         rc = sptlrpc_svc_wrap_bulk(req, desc);
3487
3488                 if (OCD_HAS_FLAG(&exp->exp_connect_data, BULK_MBITS))
3489                         req->rq_mbits = lustre_msg_get_mbits(req->rq_reqmsg);
3490                 else /* old version, bulk matchbits is rq_xid */
3491                         req->rq_mbits = req->rq_xid;
3492
3493                 if (rc == 0)
3494                         rc = ptlrpc_start_bulk_transfer(desc);
3495         }
3496
3497         if (rc < 0) {
3498                 DEBUG_REQ(D_ERROR, req, "bulk %s failed: rc = %d",
3499                           bulk2type(req), rc);
3500                 RETURN(rc);
3501         }
3502
3503         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
3504                 ptlrpc_abort_bulk(desc);
3505                 RETURN(0);
3506         }
3507
3508         /* limit actual bulk transfer to bulk_timeout seconds */
3509         deadline = start + bulk_timeout;
3510         if (deadline > req->rq_deadline)
3511                 deadline = req->rq_deadline;
3512
3513         do {
3514                 time64_t timeoutl = deadline - ktime_get_seconds();
3515                 time64_t rq_deadline;
3516
3517                 while (timeoutl >= 0 &&
3518                        wait_event_idle_timeout(
3519                                desc->bd_waitq,
3520                                !ptlrpc_server_bulk_active(desc) ||
3521                                exp->exp_failed ||
3522                                exp->exp_conn_cnt >
3523                                lustre_msg_get_conn_cnt(req->rq_reqmsg),
3524                                timeoutl ? cfs_time_seconds(1) : 1) == 0)
3525                         timeoutl -= 1;
3526                 rc = timeoutl < 0 ? -ETIMEDOUT : 0;
3527
3528                 /* Wait again if we changed rq_deadline. */
3529                 rq_deadline = READ_ONCE(req->rq_deadline);
3530                 deadline = start + bulk_timeout;
3531                 if (deadline > rq_deadline)
3532                         deadline = rq_deadline;
3533         } while (rc == -ETIMEDOUT &&
3534                  deadline > ktime_get_seconds());
3535
3536         if (rc == -ETIMEDOUT) {
3537                 DEBUG_REQ(D_ERROR, req, "timeout on bulk %s after %lld%+llds",
3538                           bulk2type(req), deadline - start,
3539                           ktime_get_real_seconds() - deadline);
3540                 ptlrpc_abort_bulk(desc);
3541         } else if (exp->exp_failed) {
3542                 DEBUG_REQ(D_ERROR, req, "Eviction on bulk %s",
3543                           bulk2type(req));
3544                 rc = -ENOTCONN;
3545                 ptlrpc_abort_bulk(desc);
3546         } else if (exp->exp_conn_cnt >
3547                    lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3548                 DEBUG_REQ(D_ERROR, req, "Reconnect on bulk %s",
3549                           bulk2type(req));
3550                 /* We don't reply anyway. */
3551                 rc = -ETIMEDOUT;
3552                 ptlrpc_abort_bulk(desc);
3553         } else if (desc->bd_failure) {
3554                 DEBUG_REQ(D_ERROR, req, "network error on bulk %s",
3555                           bulk2type(req));
3556                 /* XXX should this be a different errno? */
3557                 rc = -ETIMEDOUT;
3558         } else {
3559                 if (req->rq_bulk_write)
3560                         rc = sptlrpc_svc_unwrap_bulk(req, desc);
3561                 if (rc == 0 && desc->bd_nob_transferred != desc->bd_nob) {
3562                         DEBUG_REQ(D_ERROR, req, "truncated bulk %s %d(%d)",
3563                                   bulk2type(req), desc->bd_nob_transferred,
3564                                   desc->bd_nob);
3565                         /* XXX should this be a different errno? */
3566                         rc = -ETIMEDOUT;
3567                 }
3568         }
3569
3570         RETURN(rc);
3571 }
3572 EXPORT_SYMBOL(target_bulk_io);
3573
3574 #endif /* HAVE_SERVER_SUPPORT */