lustre/ldlm/ldlm_lib.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2010, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 /**
  34  * This file deals with various client/target related logic including recovery.
  35  *
  36  * TODO: This code more logically belongs in the ptlrpc module than in ldlm and
  37  * should be moved.
  38  */
  39
  40 #define DEBUG_SUBSYSTEM S_LDLM
  41
  42 #include <cl_object.h>
  43 #include <linux/jiffies.h>
  44 #include <linux/kernel.h>
  45 #include <linux/kthread.h>
  46 #include <libcfs/libcfs.h>
  47 #include <obd.h>
  48 #include <obd_class.h>
  49 #include <lustre_dlm.h>
  50 #include <lustre_net.h>
  51 #include <lustre_sec.h>
  52 #include "ldlm_internal.h"
  53
  54 /*
  55  * @priority: If non-zero, move the selected connection to the list head.
  56  * @create: If zero, only search in existing connections.
  57  */
  58 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  59                            int priority, int create)
  60 {
  61         struct ptlrpc_connection *ptlrpc_conn;
  62         struct obd_import_conn *imp_conn = NULL, *item;
  63         lnet_nid_t nid4refnet = LNET_NID_ANY;
  64         int rc = 0;
  65
  66         ENTRY;
  67
  68         if (!create && !priority) {
  69                 CDEBUG(D_HA, "Nothing to do\n");
  70                 RETURN(-EINVAL);
  71         }
  72
  73         if (imp->imp_connection &&
  74             imp->imp_connection->c_remote_uuid.uuid[0] == 0)
  75                 /* nid4refnet is used to restrict network connections */
  76                 nid4refnet = imp->imp_connection->c_self;
  77         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, nid4refnet);
  78         if (!ptlrpc_conn) {
  79                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  80                 RETURN(-ENOENT);
  81         }
  82
  83         if (create) {
  84                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  85                 if (!imp_conn)
  86                         GOTO(out_put, rc = -ENOMEM);
  87         }
  88
  89         spin_lock(&imp->imp_lock);
  90         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  91                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  92                         if (priority) {
  93                                 list_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_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 145 {
 146         struct obd_import_conn *imp_conn;
 147         struct obd_export *dlmexp;
 148         int rc = -ENOENT;
 149
 150         ENTRY;
 151
 152         spin_lock(&imp->imp_lock);
 153         if (list_empty(&imp->imp_conn_list)) {
 154                 LASSERT(!imp->imp_connection);
 155                 GOTO(out, rc);
 156         }
 157
 158         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 159                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 160                         continue;
 161                 LASSERT(imp_conn->oic_conn);
 162
 163                 if (imp_conn == imp->imp_conn_current) {
 164                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 165
 166                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 167                             imp->imp_state != LUSTRE_IMP_DISCON) {
 168                                 CERROR("can't remove current connection\n");
 169                                 GOTO(out, rc = -EBUSY);
 170                         }
 171
 172                         ptlrpc_connection_put(imp->imp_connection);
 173                         imp->imp_connection = NULL;
 174
 175                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 176                         if (dlmexp && dlmexp->exp_connection) {
 177                                 LASSERT(dlmexp->exp_connection ==
 178                                         imp_conn->oic_conn);
 179                                 ptlrpc_connection_put(dlmexp->exp_connection);
 180                                 dlmexp->exp_connection = NULL;
 181                         }
 182
 183                         if (dlmexp != NULL)
 184                                 class_export_put(dlmexp);
 185                 }
 186
 187                 list_del(&imp_conn->oic_item);
 188                 ptlrpc_connection_put(imp_conn->oic_conn);
 189                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 190                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 191                        imp, imp->imp_obd->obd_name, uuid->uuid);
 192                 rc = 0;
 193                 break;
 194         }
 195 out:
 196         spin_unlock(&imp->imp_lock);
 197         if (rc == -ENOENT)
 198                 CERROR("connection %s not found\n", uuid->uuid);
 199         RETURN(rc);
 200 }
 201 EXPORT_SYMBOL(client_import_del_conn);
 202
 203 /**
 204  * Find conn UUID by peer NID. \a peer is a server NID. This function is used
 205  * to find a conn uuid of \a imp which can reach \a peer.
 206  */
 207 int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
 208                             struct obd_uuid *uuid)
 209 {
 210         struct obd_import_conn *conn;
 211         int rc = -ENOENT;
 212
 213         ENTRY;
 214
 215         spin_lock(&imp->imp_lock);
 216         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 217                 /* Check if conn UUID does have this peer NID. */
 218                 if (class_check_uuid(&conn->oic_uuid, peer)) {
 219                         *uuid = conn->oic_uuid;
 220                         rc = 0;
 221                         break;
 222                 }
 223         }
 224         spin_unlock(&imp->imp_lock);
 225         RETURN(rc);
 226 }
 227 EXPORT_SYMBOL(client_import_find_conn);
 228
 229 void client_destroy_import(struct obd_import *imp)
 230 {
 231         /*
 232          * Drop security policy instance after all RPCs have finished/aborted
 233          * to let all busy contexts be released.
 234          */
 235         class_import_get(imp);
 236         class_destroy_import(imp);
 237         sptlrpc_import_sec_put(imp);
 238         class_import_put(imp);
 239 }
 240 EXPORT_SYMBOL(client_destroy_import);
 241
 242 /**
 243  * Check whether or not the OSC is on MDT.
 244  * In the config log,
 245  * osc on MDT
 246  *      setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
 247  * osc on client
 248  *      setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
 249  *
 250  **/
 251 static int osc_on_mdt(char *obdname)
 252 {
 253         char *ptr;
 254
 255         ptr = strrchr(obdname, '-');
 256         if (ptr == NULL)
 257                 return 0;
 258
 259         if (strncmp(ptr + 1, "MDT", 3) == 0)
 260                 return 1;
 261
 262         return 0;
 263 }
 264
 265 /*
 266  * Configure an RPC client OBD device.
 267  *
 268  * lcfg parameters:
 269  * 1 - client UUID
 270  * 2 - server UUID
 271  * 3 - inactive-on-startup
 272  * 4 - restrictive net
 273  */
 274 int client_obd_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 275 {
 276         struct client_obd *cli = &obd->u.cli;
 277         struct obd_import *imp;
 278         struct obd_uuid server_uuid;
 279         int rq_portal, rp_portal, connect_op;
 280         const char *name = obd->obd_type->typ_name;
 281         enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
 282         char *cli_name = lustre_cfg_buf(lcfg, 0);
 283         struct ptlrpc_connection fake_conn = { .c_self = 0,
 284                                                .c_remote_uuid.uuid[0] = 0 };
 285         int rc;
 286
 287         ENTRY;
 288
 289         /*
 290          * In a more perfect world, we would hang a ptlrpc_client off of
 291          * obd_type and just use the values from there.
 292          */
 293         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 294                 rq_portal = OST_REQUEST_PORTAL;
 295                 rp_portal = OSC_REPLY_PORTAL;
 296                 connect_op = OST_CONNECT;
 297                 cli->cl_sp_me = LUSTRE_SP_CLI;
 298                 cli->cl_sp_to = LUSTRE_SP_OST;
 299                 ns_type = LDLM_NS_TYPE_OSC;
 300         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
 301                    !strcmp(name, LUSTRE_LWP_NAME)) {
 302                 rq_portal = MDS_REQUEST_PORTAL;
 303                 rp_portal = MDC_REPLY_PORTAL;
 304                 connect_op = MDS_CONNECT;
 305                 if (is_lwp_on_ost(cli_name))
 306                         cli->cl_sp_me = LUSTRE_SP_OST;
 307                 else if (is_lwp_on_mdt(cli_name))
 308                         cli->cl_sp_me = LUSTRE_SP_MDT;
 309                 else
 310                         cli->cl_sp_me = LUSTRE_SP_CLI;
 311                 cli->cl_sp_to = LUSTRE_SP_MDT;
 312                 ns_type = LDLM_NS_TYPE_MDC;
 313         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
 314                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
 315                         /* OSP_on_MDT for other MDTs */
 316                         connect_op = MDS_CONNECT;
 317                         cli->cl_sp_to = LUSTRE_SP_MDT;
 318                         ns_type = LDLM_NS_TYPE_MDC;
 319                         rq_portal = OUT_PORTAL;
 320                 } else {
 321                         /* OSP on MDT for OST */
 322                         connect_op = OST_CONNECT;
 323                         cli->cl_sp_to = LUSTRE_SP_OST;
 324                         ns_type = LDLM_NS_TYPE_OSC;
 325                         rq_portal = OST_REQUEST_PORTAL;
 326                 }
 327                 rp_portal = OSC_REPLY_PORTAL;
 328                 cli->cl_sp_me = LUSTRE_SP_MDT;
 329         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 330                 rq_portal = MGS_REQUEST_PORTAL;
 331                 rp_portal = MGC_REPLY_PORTAL;
 332                 connect_op = MGS_CONNECT;
 333                 cli->cl_sp_me = LUSTRE_SP_MGC;
 334                 cli->cl_sp_to = LUSTRE_SP_MGS;
 335                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 336                 ns_type = LDLM_NS_TYPE_MGC;
 337         } else {
 338                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 339                        name);
 340                 RETURN(-EINVAL);
 341         }
 342
 343         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 344                 CERROR("requires a TARGET UUID\n");
 345                 RETURN(-EINVAL);
 346         }
 347
 348         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 349                 CERROR("client UUID must be less than 38 characters\n");
 350                 RETURN(-EINVAL);
 351         }
 352
 353         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 354                 CERROR("setup requires a SERVER UUID\n");
 355                 RETURN(-EINVAL);
 356         }
 357
 358         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 359                 CERROR("target UUID must be less than 38 characters\n");
 360                 RETURN(-EINVAL);
 361         }
 362
 363         init_rwsem(&cli->cl_sem);
 364         mutex_init(&cli->cl_mgc_mutex);
 365         cli->cl_seq = NULL;
 366         init_rwsem(&cli->cl_seq_rwsem);
 367         cli->cl_conn_count = 0;
 368         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 369                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 370                      sizeof(server_uuid)));
 371
 372         cli->cl_dirty_pages = 0;
 373         cli->cl_dirty_max_pages = 0;
 374         cli->cl_avail_grant = 0;
 375         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
 376         /*
 377          * cl_dirty_max_pages may be changed at connect time in
 378          * ptlrpc_connect_interpret().
 379          */
 380         client_adjust_max_dirty(cli);
 381         init_waitqueue_head(&cli->cl_cache_waiters);
 382         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 383         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 384         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 385         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 386         spin_lock_init(&cli->cl_loi_list_lock);
 387         atomic_set(&cli->cl_pending_w_pages, 0);
 388         atomic_set(&cli->cl_pending_r_pages, 0);
 389         cli->cl_r_in_flight = 0;
 390         cli->cl_w_in_flight = 0;
 391
 392         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 393         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 394         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 395         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 396         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 397         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 398
 399         /* lru for osc. */
 400         INIT_LIST_HEAD(&cli->cl_lru_osc);
 401         atomic_set(&cli->cl_lru_shrinkers, 0);
 402         atomic_long_set(&cli->cl_lru_busy, 0);
 403         atomic_long_set(&cli->cl_lru_in_list, 0);
 404         INIT_LIST_HEAD(&cli->cl_lru_list);
 405         spin_lock_init(&cli->cl_lru_list_lock);
 406         atomic_long_set(&cli->cl_unstable_count, 0);
 407         INIT_LIST_HEAD(&cli->cl_shrink_list);
 408         INIT_LIST_HEAD(&cli->cl_grant_chain);
 409
 410         INIT_LIST_HEAD(&cli->cl_flight_waiters);
 411         cli->cl_rpcs_in_flight = 0;
 412
 413         init_waitqueue_head(&cli->cl_destroy_waitq);
 414         atomic_set(&cli->cl_destroy_in_flight, 0);
 415
 416
 417         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 418         cli->cl_preferred_cksum_type = 0;
 419 #ifdef ENABLE_CHECKSUM
 420         /* Turn on checksumming by default. */
 421         cli->cl_checksum = 1;
 422         /*
 423          * The supported checksum types will be worked out at connect time
 424          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 425          * through procfs.
 426          */
 427         cli->cl_cksum_type = cli->cl_supp_cksum_types;
 428 #endif
 429         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 430
 431         /*
 432          * Set it to possible maximum size. It may be reduced by ocd_brw_size
 433          * from OFD after connecting.
 434          */
 435         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 436
 437         cli->cl_max_short_io_bytes = OBD_DEF_SHORT_IO_BYTES;
 438
 439         /*
 440          * set cl_chunkbits default value to PAGE_SHIFT,
 441          * it will be updated at OSC connection time.
 442          */
 443         cli->cl_chunkbits = PAGE_SHIFT;
 444
 445         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 446                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 447         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
 448                 cli->cl_max_rpcs_in_flight = 2;
 449         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
 450                 cli->cl_max_rpcs_in_flight = 3;
 451         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
 452                 cli->cl_max_rpcs_in_flight = 4;
 453         } else {
 454                 if (osc_on_mdt(obd->obd_name))
 455                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
 456                 else
 457                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 458         }
 459
 460         spin_lock_init(&cli->cl_mod_rpcs_lock);
 461         spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
 462         cli->cl_max_mod_rpcs_in_flight = 0;
 463         cli->cl_mod_rpcs_in_flight = 0;
 464         cli->cl_close_rpcs_in_flight = 0;
 465         init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
 466         cli->cl_mod_tag_bitmap = NULL;
 467
 468         INIT_LIST_HEAD(&cli->cl_chg_dev_linkage);
 469
 470         if (connect_op == MDS_CONNECT) {
 471                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
 472                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
 473                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 474                 if (cli->cl_mod_tag_bitmap == NULL)
 475                         GOTO(err, rc = -ENOMEM);
 476         }
 477
 478         rc = ldlm_get_ref();
 479         if (rc) {
 480                 CERROR("ldlm_get_ref failed: %d\n", rc);
 481                 GOTO(err, rc);
 482         }
 483
 484         ptlrpc_init_client(rq_portal, rp_portal, name,
 485                            &obd->obd_ldlm_client);
 486
 487         imp = class_new_import(obd);
 488         if (imp == NULL)
 489                 GOTO(err_ldlm, rc = -ENOENT);
 490         imp->imp_client = &obd->obd_ldlm_client;
 491         imp->imp_connect_op = connect_op;
 492         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 493                LUSTRE_CFG_BUFLEN(lcfg, 1));
 494         class_import_put(imp);
 495
 496         if (lustre_cfg_buf(lcfg, 4)) {
 497                 __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
 498
 499                 if (refnet == LNET_NIDNET(LNET_NID_ANY)) {
 500                         rc = -EINVAL;
 501                         CERROR("%s: bad mount option 'network=%s': rc = %d\n",
 502                                obd->obd_name, lustre_cfg_string(lcfg, 4),
 503                                rc);
 504                         GOTO(err_import, rc);
 505                 }
 506                 fake_conn.c_self = LNET_MKNID(refnet, 0);
 507                 imp->imp_connection = &fake_conn;
 508         }
 509
 510         rc = client_import_add_conn(imp, &server_uuid, 1);
 511         if (rc) {
 512                 CERROR("can't add initial connection\n");
 513                 GOTO(err_import, rc);
 514         }
 515         imp->imp_connection = NULL;
 516
 517         cli->cl_import = imp;
 518         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
 519         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 520
 521         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 522                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 523                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 524                                name, obd->obd_name,
 525                                cli->cl_target_uuid.uuid);
 526                         spin_lock(&imp->imp_lock);
 527                         imp->imp_deactive = 1;
 528                         spin_unlock(&imp->imp_lock);
 529                 }
 530         }
 531
 532         obd->obd_namespace = ldlm_namespace_new(obd, obd->obd_name,
 533                                                 LDLM_NAMESPACE_CLIENT,
 534                                                 LDLM_NAMESPACE_GREEDY,
 535                                                 ns_type);
 536         if (obd->obd_namespace == NULL) {
 537                 CERROR("Unable to create client namespace - %s\n",
 538                        obd->obd_name);
 539                 GOTO(err_import, rc = -ENOMEM);
 540         }
 541
 542         RETURN(rc);
 543
 544 err_import:
 545         class_destroy_import(imp);
 546 err_ldlm:
 547         ldlm_put_ref();
 548 err:
 549         if (cli->cl_mod_tag_bitmap != NULL)
 550                 OBD_FREE(cli->cl_mod_tag_bitmap,
 551                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 552         cli->cl_mod_tag_bitmap = NULL;
 553         RETURN(rc);
 554
 555 }
 556 EXPORT_SYMBOL(client_obd_setup);
 557
 558 int client_obd_cleanup(struct obd_device *obd)
 559 {
 560         struct client_obd *cli = &obd->u.cli;
 561
 562         ENTRY;
 563
 564         ldlm_namespace_free_post(obd->obd_namespace);
 565         obd->obd_namespace = NULL;
 566
 567         obd_cleanup_client_import(obd);
 568         LASSERT(obd->u.cli.cl_import == NULL);
 569
 570         ldlm_put_ref();
 571
 572         if (cli->cl_mod_tag_bitmap != NULL)
 573                 OBD_FREE(cli->cl_mod_tag_bitmap,
 574                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 575         cli->cl_mod_tag_bitmap = NULL;
 576
 577         RETURN(0);
 578 }
 579 EXPORT_SYMBOL(client_obd_cleanup);
 580
 581 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 582 int client_connect_import(const struct lu_env *env,
 583                           struct obd_export **exp,
 584                           struct obd_device *obd, struct obd_uuid *cluuid,
 585                           struct obd_connect_data *data, void *localdata)
 586 {
 587         struct client_obd *cli = &obd->u.cli;
 588         struct obd_import *imp = cli->cl_import;
 589         struct obd_connect_data *ocd;
 590         struct lustre_handle conn = { 0 };
 591         int rc;
 592
 593         ENTRY;
 594
 595         *exp = NULL;
 596         down_write(&cli->cl_sem);
 597         if (cli->cl_conn_count > 0)
 598                 GOTO(out_sem, rc = -EALREADY);
 599
 600         rc = class_connect(&conn, obd, cluuid);
 601         if (rc)
 602                 GOTO(out_sem, rc);
 603
 604         cli->cl_conn_count++;
 605         *exp = class_conn2export(&conn);
 606
 607         LASSERT(obd->obd_namespace);
 608
 609         imp->imp_dlm_handle = conn;
 610         rc = ptlrpc_init_import(imp);
 611         if (rc != 0)
 612                 GOTO(out_ldlm, rc);
 613
 614         ocd = &imp->imp_connect_data;
 615         if (data) {
 616                 *ocd = *data;
 617                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 618                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
 619         }
 620
 621         rc = ptlrpc_connect_import(imp);
 622         if (rc != 0) {
 623                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 624                 GOTO(out_ldlm, rc);
 625         }
 626         LASSERT(*exp != NULL && (*exp)->exp_connection);
 627
 628         if (data) {
 629                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 630                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 631                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 632                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 633                 data->ocd_connect_flags2 = ocd->ocd_connect_flags2;
 634         }
 635
 636         ptlrpc_pinger_add_import(imp);
 637
 638         EXIT;
 639
 640         if (rc) {
 641 out_ldlm:
 642                 cli->cl_conn_count--;
 643                 class_disconnect(*exp);
 644                 *exp = NULL;
 645         }
 646 out_sem:
 647         up_write(&cli->cl_sem);
 648
 649         if (!rc && localdata) {
 650                 LASSERT(cli->cl_cache == NULL); /* only once */
 651                 cli->cl_cache = (struct cl_client_cache *)localdata;
 652                 cl_cache_incref(cli->cl_cache);
 653                 cli->cl_lru_left = &cli->cl_cache->ccc_lru_left;
 654
 655                 /* add this osc into entity list */
 656                 LASSERT(list_empty(&cli->cl_lru_osc));
 657                 spin_lock(&cli->cl_cache->ccc_lru_lock);
 658                 list_add(&cli->cl_lru_osc, &cli->cl_cache->ccc_lru);
 659                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
 660         }
 661
 662         return rc;
 663 }
 664 EXPORT_SYMBOL(client_connect_import);
 665
 666 int client_disconnect_export(struct obd_export *exp)
 667 {
 668         struct obd_device *obd = class_exp2obd(exp);
 669         struct client_obd *cli;
 670         struct obd_import *imp;
 671         int rc = 0, err;
 672
 673         ENTRY;
 674
 675         if (!obd) {
 676                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 677                        exp, exp ? exp->exp_handle.h_cookie : -1);
 678                 RETURN(-EINVAL);
 679         }
 680
 681         cli = &obd->u.cli;
 682         imp = cli->cl_import;
 683
 684         down_write(&cli->cl_sem);
 685         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
 686                 cli->cl_conn_count);
 687
 688         if (cli->cl_conn_count == 0) {
 689                 CERROR("disconnecting disconnected device (%s)\n",
 690                        obd->obd_name);
 691                 GOTO(out_disconnect, rc = -EINVAL);
 692         }
 693
 694         cli->cl_conn_count--;
 695         if (cli->cl_conn_count != 0)
 696                 GOTO(out_disconnect, rc = 0);
 697
 698         /*
 699          * Mark import deactivated now, so we don't try to reconnect if any
 700          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 701          * fully deactivate the import, or that would drop all requests.
 702          */
 703         spin_lock(&imp->imp_lock);
 704         imp->imp_deactive = 1;
 705         spin_unlock(&imp->imp_lock);
 706
 707         /*
 708          * Some non-replayable imports (MDS's OSCs) are pinged, so just
 709          * delete it regardless.  (It's safe to delete an import that was
 710          * never added.)
 711          */
 712         (void)ptlrpc_pinger_del_import(imp);
 713
 714         if (obd->obd_namespace != NULL) {
 715                 /* obd_force == local only */
 716                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 717                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 718                 ldlm_namespace_free_prior(obd->obd_namespace, imp,
 719                                           obd->obd_force);
 720         }
 721
 722         /*
 723          * There's no need to hold sem while disconnecting an import,
 724          * and it may actually cause deadlock in GSS.
 725          */
 726         up_write(&cli->cl_sem);
 727         rc = ptlrpc_disconnect_import(imp, 0);
 728         down_write(&cli->cl_sem);
 729
 730         ptlrpc_invalidate_import(imp);
 731
 732         EXIT;
 733
 734 out_disconnect:
 735         /*
 736          * Use server style - class_disconnect should be always called for
 737          * o_disconnect.
 738          */
 739         err = class_disconnect(exp);
 740         if (!rc && err)
 741                 rc = err;
 742
 743         up_write(&cli->cl_sem);
 744
 745         RETURN(rc);
 746 }
 747 EXPORT_SYMBOL(client_disconnect_export);
 748
 749 #ifdef HAVE_SERVER_SUPPORT
 750 int server_disconnect_export(struct obd_export *exp)
 751 {
 752         int rc;
 753
 754         ENTRY;
 755
 756         /* Disconnect early so that clients can't keep using export. */
 757         rc = class_disconnect(exp);
 758         /* Close import to avoid sending any requests. */
 759         if (exp->exp_imp_reverse)
 760                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 761
 762         ldlm_bl_thread_wakeup();
 763
 764         /* complete all outstanding replies */
 765         spin_lock(&exp->exp_lock);
 766         while (!list_empty(&exp->exp_outstanding_replies)) {
 767                 struct ptlrpc_reply_state *rs =
 768                         list_entry(exp->exp_outstanding_replies.next,
 769                                        struct ptlrpc_reply_state, rs_exp_list);
 770                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 771
 772                 spin_lock(&svcpt->scp_rep_lock);
 773
 774                 list_del_init(&rs->rs_exp_list);
 775
 776                 spin_lock(&rs->rs_lock);
 777                 /* clear rs_convert_lock to make sure rs is handled and put */
 778                 rs->rs_convert_lock = 0;
 779                 ptlrpc_schedule_difficult_reply(rs);
 780                 spin_unlock(&rs->rs_lock);
 781
 782                 spin_unlock(&svcpt->scp_rep_lock);
 783         }
 784         spin_unlock(&exp->exp_lock);
 785
 786         RETURN(rc);
 787 }
 788 EXPORT_SYMBOL(server_disconnect_export);
 789
 790 static inline int target_check_recovery_timer(struct obd_device *target)
 791 {
 792         ktime_t remaining;
 793         s64 timeout;
 794
 795         if (!target->obd_recovering || target->obd_recovery_start == 0)
 796                 return 0;
 797
 798         remaining = hrtimer_expires_remaining(&target->obd_recovery_timer);
 799         timeout = ktime_divns(remaining, NSEC_PER_SEC);
 800         if (timeout > -30)
 801                 return 0;
 802
 803         /* the recovery timer should expire, but it isn't triggered,
 804          * it's better to abort the recovery of this target to speed up
 805          * the recovery of the whole cluster. */
 806         spin_lock(&target->obd_dev_lock);
 807         if (target->obd_recovering) {
 808                 CERROR("%s: Aborting recovery\n", target->obd_name);
 809                 target->obd_abort_recovery = 1;
 810                 wake_up(&target->obd_next_transno_waitq);
 811         }
 812         spin_unlock(&target->obd_dev_lock);
 813         return 0;
 814 }
 815
 816 /*
 817  * --------------------------------------------------------------------------
 818  * from old lib/target.c
 819  * --------------------------------------------------------------------------
 820  */
 821 static int target_handle_reconnect(struct lustre_handle *conn,
 822                                    struct obd_export *exp,
 823                                    struct obd_uuid *cluuid)
 824 {
 825         struct obd_device *target;
 826         struct lustre_handle *hdl;
 827         ktime_t remaining;
 828         s64 timeout;
 829         int rc = 0;
 830
 831         ENTRY;
 832         hdl = &exp->exp_imp_reverse->imp_remote_handle;
 833         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
 834                 conn->cookie = exp->exp_handle.h_cookie;
 835                 CDEBUG(D_HA,
 836                        "connect export for UUID '%s' at %p, cookie %#llx\n",
 837                        cluuid->uuid, exp, conn->cookie);
 838                 RETURN(0);
 839         }
 840
 841         target = exp->exp_obd;
 842
 843         /* Might be a re-connect after a partition. */
 844         if (memcmp(&conn->cookie, &hdl->cookie, sizeof(conn->cookie))) {
 845                 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",
 846                               target->obd_name,
 847                               obd_uuid2str(&exp->exp_client_uuid),
 848                               obd_export_nid2str(exp),
 849                               hdl->cookie, conn->cookie);
 850                 memset(conn, 0, sizeof(*conn));
 851                 /*
 852                  * target_handle_connect() treats EALREADY and
 853                  * -EALREADY differently.  -EALREADY is an error
 854                  * (same UUID, different handle).
 855                  */
 856                 RETURN(-EALREADY);
 857         }
 858
 859         if (!target->obd_recovering) {
 860                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
 861                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
 862                         obd_export_nid2str(exp));
 863                 GOTO(out_already, rc);
 864         }
 865
 866         remaining = hrtimer_expires_remaining(&target->obd_recovery_timer);
 867         timeout = ktime_divns(remaining, NSEC_PER_SEC);
 868         if (timeout > 0) {
 869                 LCONSOLE_WARN("%s: Client %s (at %s) reconnected, waiting for %d clients in recovery for %lld:%.02lld\n",
 870                               target->obd_name,
 871                               obd_uuid2str(&exp->exp_client_uuid),
 872                               obd_export_nid2str(exp),
 873                               atomic_read(&target->obd_max_recoverable_clients),
 874                               timeout / 60, timeout % 60);
 875         } else {
 876                 struct target_distribute_txn_data *tdtd;
 877                 int size = 0;
 878                 int count = 0;
 879                 char *buf = NULL;
 880
 881                 target_check_recovery_timer(target);
 882
 883                 tdtd = class_exp2tgt(exp)->lut_tdtd;
 884                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
 885                         buf = tdtd->tdtd_show_update_logs_retrievers(
 886                                 tdtd->tdtd_show_retrievers_cbdata,
 887                                 &size, &count);
 888
 889                 if (count > 0)
 890                         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",
 891                                       target->obd_name,
 892                                       obd_uuid2str(&exp->exp_client_uuid),
 893                                       obd_export_nid2str(exp), count,
 894                                       buf ? buf : "unknown (not enough RAM)",
 895                                       (abs(timeout) + target->obd_recovery_timeout) / 60,
 896                                       (abs(timeout) + target->obd_recovery_timeout) % 60,
 897                                       target->obd_name);
 898                 else
 899                         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",
 900                                       target->obd_name, abs(timeout) / 60,
 901                                       abs(timeout) % 60, target->obd_name);
 902
 903                 if (buf != NULL)
 904                         OBD_FREE(buf, size);
 905         }
 906
 907 out_already:
 908         conn->cookie = exp->exp_handle.h_cookie;
 909         /*
 910          * target_handle_connect() treats EALREADY and
 911          * -EALREADY differently.  EALREADY means we are
 912          * doing a valid reconnect from the same client.
 913          */
 914         RETURN(EALREADY);
 915 }
 916
 917 static void
 918 check_and_start_recovery_timer(struct obd_device *obd,
 919                                struct ptlrpc_request *req, int new_client);
 920
 921 /**
 922  * update flags for import during reconnect process
 923  */
 924 static int rev_import_flags_update(struct obd_import *revimp,
 925                                    struct ptlrpc_request *req)
 926 {
 927         int rc;
 928         struct obd_connect_data *data;
 929
 930         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 931
 932         if (data->ocd_connect_flags & OBD_CONNECT_AT)
 933                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 934         else
 935                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 936
 937         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
 938
 939         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
 940         if (rc) {
 941                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
 942                         revimp->imp_client->cli_name,
 943                         libcfs_id2str(req->rq_peer), rc);
 944                 return rc;
 945         }
 946
 947         return 0;
 948 }
 949
 950 /**
 951  * Allocate a new reverse import for an export.
 952  *
 953  * \retval -errno in case error hit
 954  * \retval 0 if reverse import correctly init
 955  **/
 956 int rev_import_init(struct obd_export *export)
 957 {
 958         struct obd_device *obd = export->exp_obd;
 959         struct obd_import *revimp;
 960
 961         LASSERT(export->exp_imp_reverse == NULL);
 962
 963         revimp = class_new_import(obd);
 964         if (revimp == NULL)
 965                 return -ENOMEM;
 966
 967         revimp->imp_remote_handle.cookie = 0ULL;
 968         revimp->imp_client = &obd->obd_ldlm_client;
 969         revimp->imp_dlm_fake = 1;
 970
 971         /* it is safe to connect import in new state as no sends possible */
 972         spin_lock(&export->exp_lock);
 973         export->exp_imp_reverse = revimp;
 974         spin_unlock(&export->exp_lock);
 975         class_import_put(revimp);
 976
 977         return 0;
 978 }
 979 EXPORT_SYMBOL(rev_import_init);
 980
 981 /**
 982  * Handle reconnect for an export.
 983  *
 984  * \param exp export to handle reconnect process
 985  * \param req client reconnect request
 986  *
 987  * \retval -rc in case securitfy flavor can't be changed
 988  * \retval 0 in case none problems
 989  */
 990 static int rev_import_reconnect(struct obd_export *exp,
 991                                 struct ptlrpc_request *req)
 992 {
 993         struct obd_import *revimp = exp->exp_imp_reverse;
 994         struct lustre_handle *lh;
 995         int rc;
 996
 997         /* avoid sending a request until import flags are changed */
 998         ptlrpc_import_enter_resend(revimp);
 999
1000         if (revimp->imp_connection != NULL)
1001                 ptlrpc_connection_put(revimp->imp_connection);
1002
1003         /*
1004          * client from recovery don't have a handle so we need to take from
1005          * request. it may produce situation when wrong client connected
1006          * to recovery as we trust a client uuid
1007          */
1008         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1009         revimp->imp_remote_handle = *lh;
1010
1011         /*
1012          * unknown versions will be caught in
1013          * ptlrpc_handle_server_req_in->lustre_unpack_msg()
1014          */
1015         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1016
1017         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
1018
1019         rc = rev_import_flags_update(revimp, req);
1020         if (rc != 0) {
1021                 /*
1022                  * it is safe to still be in RECOVERY phase as we are not able
1023                  * to setup correct security flavor so requests are not able to
1024                  * be delivered correctly
1025                  */
1026                 return rc;
1027         }
1028
1029         /* resend all rpc's via new connection */
1030         return ptlrpc_import_recovery_state_machine(revimp);
1031 }
1032
1033 int target_handle_connect(struct ptlrpc_request *req)
1034 {
1035         struct obd_device *target = NULL;
1036         struct obd_export *export = NULL;
1037         /*
1038          * connect handle - filled from target_handle_reconnect in
1039          * reconnect case
1040          */
1041         struct lustre_handle conn;
1042         struct lustre_handle *tmp;
1043         struct obd_uuid cluuid;
1044         char *str;
1045         int rc = 0;
1046         char *target_start;
1047         int target_len;
1048         bool mds_conn = false, lw_client = false, initial_conn = false;
1049         bool mds_mds_conn = false;
1050         bool new_mds_mds_conn = false;
1051         struct obd_connect_data *data, *tmpdata;
1052         int size, tmpsize;
1053         lnet_nid_t *client_nid = NULL;
1054
1055         ENTRY;
1056
1057         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
1058
1059         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
1060         if (str == NULL) {
1061                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
1062                 GOTO(out, rc = -EINVAL);
1063         }
1064
1065         target = class_dev_by_str(str);
1066         if (!target) {
1067                 deuuidify(str, NULL, &target_start, &target_len);
1068                 LCONSOLE_ERROR_MSG(0x137,
1069                                    "%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",
1070                                    str, libcfs_nid2str(req->rq_peer.nid));
1071                 GOTO(out, rc = -ENODEV);
1072         }
1073
1074         spin_lock(&target->obd_dev_lock);
1075
1076         target->obd_conn_inprogress++;
1077
1078         if (target->obd_stopping || !target->obd_set_up) {
1079                 spin_unlock(&target->obd_dev_lock);
1080
1081                 deuuidify(str, NULL, &target_start, &target_len);
1082                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
1083                               target_len, target_start,
1084                               libcfs_nid2str(req->rq_peer.nid),
1085                               (target->obd_stopping ?
1086                                "stopping" : "not set up"));
1087                 GOTO(out, rc = -ENODEV);
1088         }
1089
1090         if (target->obd_no_conn) {
1091                 spin_unlock(&target->obd_dev_lock);
1092
1093                 CDEBUG(D_INFO,
1094                        "%s: Temporarily refusing client connection from %s\n",
1095                        target->obd_name, libcfs_nid2str(req->rq_peer.nid));
1096                 GOTO(out, rc = -EAGAIN);
1097         }
1098
1099         spin_unlock(&target->obd_dev_lock);
1100
1101         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1102         if (str == NULL) {
1103                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1104                 GOTO(out, rc = -EINVAL);
1105         }
1106
1107         obd_str2uuid(&cluuid, str);
1108
1109         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1110         if (tmp == NULL)
1111                 GOTO(out, rc = -EPROTO);
1112
1113         conn = *tmp;
1114
1115         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1116                                     RCL_CLIENT);
1117         if (size < 0 || size > 8 * sizeof(struct obd_connect_data))
1118                 GOTO(out, rc = -EPROTO);
1119         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1120         if (!data)
1121                 GOTO(out, rc = -EPROTO);
1122
1123         rc = req_capsule_server_pack(&req->rq_pill);
1124         if (rc)
1125                 GOTO(out, rc);
1126
1127 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1128         /*
1129          * Don't allow clients to connect that are using old 1.8 format
1130          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1131          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1132          * FULL20 flag should be set on all connections since 2.0, but no
1133          * longer affects behaviour.
1134          *
1135          * Later this check will be disabled and the flag can be retired
1136          * completely once interop with 3.0 is no longer needed.
1137          */
1138         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1139                 GOTO(out, rc = -EPROTO);
1140
1141         /*
1142          * Don't allow liblustre clients to connect.
1143          * - testing was disabled in v2_2_50_0-61-g6a75d65
1144          * - building was disabled in v2_5_58_0-28-g7277179
1145          * - client code was deleted in v2_6_50_0-101-gcdfbc72,
1146          * - clients were refused connect for version difference > 0.0.1.32
1147          */
1148         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1149                 DEBUG_REQ(D_WARNING, req, "Refusing libclient connection");
1150                 GOTO(out, rc = -EPROTO);
1151         }
1152 #endif
1153
1154         /*
1155          * Note: lw_client is needed in MDS-MDS failover during update log
1156          * processing, so we needs to allow lw_client to be connected at
1157          * anytime, instead of only the initial connection
1158          */
1159         lw_client = (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0;
1160
1161         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1162                 initial_conn = true;
1163                 mds_conn = (data->ocd_connect_flags & OBD_CONNECT_MDS) != 0;
1164                 mds_mds_conn = (data->ocd_connect_flags &
1165                                 OBD_CONNECT_MDS_MDS) != 0;
1166
1167                 /*
1168                  * OBD_CONNECT_MNE_SWAB is removed at 2.14
1169                  * Checking OBD_CONNECT_FID can be removed in the future.
1170                  *
1171                  * Via check OBD_CONNECT_FID, we can distinguish whether
1172                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1173                  * MGC or MDT, since MGC does not use OBD_CONNECT_FID.
1174                  */
1175                 if (!lw_client &&
1176                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1177                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1178                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1179                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1180                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1181                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1182
1183                         /*
1184                          * We do not support the MDT-MDT interoperations with
1185                          * different version MDT because of protocol changes.
1186                          */
1187                         if (unlikely(major != LUSTRE_MAJOR ||
1188                                      minor != LUSTRE_MINOR ||
1189                                      abs(patch - LUSTRE_PATCH) > 3)) {
1190                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the connection from different version MDT (%d.%d.%d.%d) %s %s\n",
1191                                               target->obd_name, LUSTRE_MAJOR,
1192                                               LUSTRE_MINOR, LUSTRE_PATCH,
1193                                               LUSTRE_FIX, major, minor, patch,
1194                                               OBD_OCD_VERSION_FIX(data->ocd_version),
1195                                               libcfs_nid2str(req->rq_peer.nid),
1196                                               str);
1197                                 GOTO(out, rc = -EPROTO);
1198                         }
1199                 }
1200         }
1201
1202         /* lctl gets a backstage, all-access pass. */
1203         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1204                 goto dont_check_exports;
1205
1206         export = obd_uuid_lookup(target, &cluuid);
1207         if (!export)
1208                 goto no_export;
1209
1210         /* We've found an export in the hash. */
1211
1212         spin_lock(&export->exp_lock);
1213
1214         if (export->exp_connecting) { /* b=9635, et. al. */
1215                 spin_unlock(&export->exp_lock);
1216                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1217                               export->exp_obd->obd_name, export,
1218                               libcfs_nid2str(req->rq_peer.nid));
1219                 class_export_put(export);
1220                 export = NULL;
1221                 rc = -EALREADY;
1222         } else if ((mds_conn || (lw_client && initial_conn) ||
1223                    data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1224                    export->exp_connection != NULL) {
1225                 spin_unlock(&export->exp_lock);
1226                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1227                         /* MDS or LWP reconnected after failover. */
1228                         LCONSOLE_WARN("%s: Received %s connection from %s, removing former export from %s\n",
1229                                       target->obd_name,
1230                                       mds_conn ? "MDS" : "LWP",
1231                                       libcfs_nid2str(req->rq_peer.nid),
1232                                       libcfs_nid2str(export->exp_connection->c_peer.nid));
1233                 } else {
1234                         /* New MDS connection from the same NID. */
1235                         LCONSOLE_WARN("%s: Received new %s connection from %s, removing former export from same NID\n",
1236                                       target->obd_name,
1237                                       mds_conn ? "MDS" : "LWP",
1238                                       libcfs_nid2str(req->rq_peer.nid));
1239                 }
1240
1241                 if (req->rq_peer.nid == export->exp_connection->c_peer.nid &&
1242                     data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
1243                         /*
1244                          * Because exports between MDTs will always be
1245                          * kept, let's do not fail such export if they
1246                          * come from the same NID, otherwise it might
1247                          * cause eviction between MDTs, which might
1248                          * cause namespace inconsistency
1249                          */
1250                         spin_lock(&export->exp_lock);
1251                         export->exp_connecting = 1;
1252                         export->exp_conn_cnt = 0;
1253                         spin_unlock(&export->exp_lock);
1254                         conn.cookie = export->exp_handle.h_cookie;
1255                         rc = EALREADY;
1256                 } else {
1257                         class_fail_export(export);
1258                         class_export_put(export);
1259                         export = NULL;
1260                         rc = 0;
1261                 }
1262         } else if (export->exp_connection != NULL && initial_conn &&
1263                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1264                 spin_unlock(&export->exp_lock);
1265                 /* In MDS failover we have static UUID but NID can change. */
1266                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when existing nid %s is already connected\n",
1267                               target->obd_name, cluuid.uuid,
1268                               libcfs_nid2str(req->rq_peer.nid),
1269                               libcfs_nid2str(
1270                                         export->exp_connection->c_peer.nid));
1271                 rc = -EALREADY;
1272                 class_export_put(export);
1273                 export = NULL;
1274         } else if (OBD_FAIL_PRECHECK(OBD_FAIL_TGT_RECOVERY_CONNECT) &&
1275                    !lw_client) {
1276                 spin_unlock(&export->exp_lock);
1277                 rc = -EAGAIN;
1278         } else {
1279                 export->exp_connecting = 1;
1280                 spin_unlock(&export->exp_lock);
1281                 LASSERT(export->exp_obd == target);
1282
1283                 rc = target_handle_reconnect(&conn, export, &cluuid);
1284         }
1285
1286         /* If we found an export, we already unlocked. */
1287         if (!export) {
1288 no_export:
1289                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1290         } else if (req->rq_export == NULL &&
1291                    atomic_read(&export->exp_rpc_count) > 0) {
1292                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, still busy with %d references\n",
1293                               target->obd_name, cluuid.uuid,
1294                               libcfs_nid2str(req->rq_peer.nid),
1295                               refcount_read(&export->exp_handle.h_ref));
1296                         GOTO(out, rc = -EBUSY);
1297         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
1298                    rc != EALREADY) {
1299                 if (!strstr(cluuid.uuid, "mdt"))
1300                         LCONSOLE_WARN("%s: Rejecting reconnect from the known client %s (at %s) because it is indicating it is a new client",
1301                                       target->obd_name, cluuid.uuid,
1302                                       libcfs_nid2str(req->rq_peer.nid));
1303                 GOTO(out, rc = -EALREADY);
1304         } else {
1305                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1306         }
1307
1308         if (rc < 0)
1309                 GOTO(out, rc);
1310
1311         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %lld last %lld\n",
1312                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1313                target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1314                export, ktime_get_seconds(),
1315                export ? export->exp_last_request_time : 0);
1316
1317         /*
1318          * If this is the first time a client connects, reset the recovery
1319          * timer. Discard lightweight connections which might be local.
1320          */
1321         if (!lw_client && rc == 0 && target->obd_recovering)
1322                 check_and_start_recovery_timer(target, req, export == NULL);
1323
1324         /*
1325          * We want to handle EALREADY but *not* -EALREADY from
1326          * target_handle_reconnect(), return reconnection state in a flag.
1327          */
1328         if (rc == EALREADY) {
1329                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1330                 rc = 0;
1331         } else {
1332                 LASSERT(rc == 0);
1333         }
1334
1335         /* Tell the client if we support replayable requests. */
1336         if (target->obd_replayable)
1337                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1338         client_nid = &req->rq_peer.nid;
1339
1340         if (export == NULL) {
1341                 /* allow lightweight connections during recovery */
1342                 /*
1343                  * allow "new" MDT to be connected during recovery, since we
1344                  * need retrieve recovery update records from it
1345                  */
1346                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1347                         struct hrtimer *timer = &target->obd_recovery_timer;
1348                         ktime_t remaining;
1349                         s64 timeout, left;
1350                         int in_progress;
1351                         int connected;
1352                         int known;
1353                         int stale;
1354                         char *msg;
1355
1356                         connected = atomic_read(&target->obd_connected_clients);
1357                         in_progress = atomic_read(&target->obd_lock_replay_clients);
1358                         known =
1359                            atomic_read(&target->obd_max_recoverable_clients);
1360                         stale = target->obd_stale_clients;
1361                         remaining = hrtimer_expires_remaining(timer);
1362                         left = ktime_divns(remaining, NSEC_PER_SEC);
1363
1364                         if (ktime_to_ns(remaining) > 0) {
1365                                 msg = "to recover in";
1366                                 timeout = left;
1367                         } else {
1368                                 msg = "already passed deadline";
1369                                 timeout = -left;
1370
1371                                 target_check_recovery_timer(target);
1372                         }
1373
1374                         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",
1375                                       target->obd_name, cluuid.uuid,
1376                                       libcfs_nid2str(req->rq_peer.nid), known,
1377                                       connected - in_progress, in_progress,
1378                                       stale, msg, timeout / 60, timeout % 60);
1379                         rc = -EBUSY;
1380                 } else {
1381 dont_check_exports:
1382                         rc = obd_connect(req->rq_svc_thread->t_env,
1383                                          &export, target, &cluuid, data,
1384                                          client_nid);
1385                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1386                                 lustre_msg_add_op_flags(req->rq_repmsg,
1387                                                         MSG_CONNECT_RECOVERING);
1388                         if (rc == 0) {
1389                                 conn.cookie = export->exp_handle.h_cookie;
1390                                 rc = rev_import_init(export);
1391                         }
1392
1393                         if (mds_mds_conn)
1394                                 new_mds_mds_conn = true;
1395                 }
1396         } else {
1397                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1398                                    export, target, &cluuid, data, client_nid);
1399         }
1400         if (rc)
1401                 GOTO(out, rc);
1402
1403         LASSERT(target->u.obt.obt_magic == OBT_MAGIC);
1404         data->ocd_instance = target->u.obt.obt_instance;
1405
1406         /*
1407          * Return only the parts of obd_connect_data that we understand, so the
1408          * client knows that we don't understand the rest.
1409          */
1410         if (data) {
1411                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1412                                                RCL_SERVER);
1413                 tmpdata = req_capsule_server_get(&req->rq_pill,
1414                                                  &RMF_CONNECT_DATA);
1415                 /*
1416                  * Don't use struct assignment here, because the client reply
1417                  * buffer may be smaller/larger than the local struct
1418                  * obd_connect_data.
1419                  */
1420                 memcpy(tmpdata, data, min(tmpsize, size));
1421         }
1422
1423         /*
1424          * If the client and the server are the same node, we will already
1425          * have an export that really points to the client's DLM export,
1426          * because we have a shared handles table.
1427          *
1428          * XXX this will go away when shaver stops sending the "connect" handle
1429          * in the real "remote handle" field of the request --phik 24 Apr 2003
1430          */
1431         ptlrpc_request_change_export(req, export);
1432
1433         spin_lock(&export->exp_lock);
1434         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1435                 spin_unlock(&export->exp_lock);
1436                 CDEBUG(D_RPCTRACE,
1437                        "%s: %s already connected at greater or equal conn_cnt: %d >= %d\n",
1438                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1439                        export->exp_conn_cnt,
1440                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1441
1442                 GOTO(out, rc = -EALREADY);
1443         }
1444         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1445         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1446         spin_unlock(&export->exp_lock);
1447
1448         if (export->exp_connection != NULL) {
1449                 /* Check to see if connection came from another NID. */
1450                 if (export->exp_connection->c_peer.nid != req->rq_peer.nid)
1451                         obd_nid_del(export->exp_obd, export);
1452
1453                 ptlrpc_connection_put(export->exp_connection);
1454         }
1455
1456         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
1457                                                        req->rq_self,
1458                                                        &cluuid);
1459         obd_nid_add(export->exp_obd, export);
1460
1461         lustre_msg_set_handle(req->rq_repmsg, &conn);
1462
1463         rc = rev_import_reconnect(export, req);
1464         if (rc != 0)
1465                 GOTO(out, rc);
1466
1467         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1468                 int has_transno;
1469                 __u64 transno = data->ocd_transno;
1470
1471                 spin_lock(&export->exp_lock);
1472                 /*
1473                  * possible race with class_disconnect_stale_exports,
1474                  * export may be already in the eviction process
1475                  */
1476                 if (export->exp_failed) {
1477                         spin_unlock(&export->exp_lock);
1478                         GOTO(out, rc = -ENODEV);
1479                 }
1480                 export->exp_in_recovery = 1;
1481                 export->exp_req_replay_needed = 1;
1482                 export->exp_lock_replay_needed = 1;
1483                 spin_unlock(&export->exp_lock);
1484
1485                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1486                                  MSG_CONNECT_TRANSNO);
1487                 if (has_transno && transno == 0)
1488                         CWARN("Connect with zero transno!\n");
1489
1490                 if (has_transno && transno > 0 &&
1491                     transno < target->obd_next_recovery_transno &&
1492                     transno > target->obd_last_committed) {
1493                         /* Another way is to use cmpxchg() to be lock-free. */
1494                         spin_lock(&target->obd_recovery_task_lock);
1495                         if (transno < target->obd_next_recovery_transno)
1496                                 target->obd_next_recovery_transno = transno;
1497                         spin_unlock(&target->obd_recovery_task_lock);
1498                 }
1499
1500                 atomic_inc(&target->obd_req_replay_clients);
1501                 atomic_inc(&target->obd_lock_replay_clients);
1502                 /*
1503                  * Note: MDS-MDS connection is allowed to be connected during
1504                  * recovery, no matter if the exports needs to be recoveried.
1505                  * Because we need retrieve updates logs from all other MDTs.
1506                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1507                  * also needs to be increased to match other recovery checking
1508                  * condition.
1509                  */
1510                 if (new_mds_mds_conn)
1511                         atomic_inc(&target->obd_max_recoverable_clients);
1512
1513                 if (atomic_inc_return(&target->obd_connected_clients) ==
1514                     atomic_read(&target->obd_max_recoverable_clients))
1515                         wake_up(&target->obd_next_transno_waitq);
1516         }
1517
1518         /* Tell the client we're in recovery, when client is involved in it. */
1519         if (target->obd_recovering && !lw_client)
1520                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1521
1522 out:
1523         if (export) {
1524                 spin_lock(&export->exp_lock);
1525                 export->exp_connecting = 0;
1526                 spin_unlock(&export->exp_lock);
1527
1528                 class_export_put(export);
1529         }
1530         if (target != NULL) {
1531                 spin_lock(&target->obd_dev_lock);
1532                 target->obd_conn_inprogress--;
1533                 spin_unlock(&target->obd_dev_lock);
1534                 class_decref(target, "find", current);
1535         }
1536         req->rq_status = rc;
1537         RETURN(rc);
1538 }
1539
1540 int target_handle_disconnect(struct ptlrpc_request *req)
1541 {
1542         int rc;
1543
1544         ENTRY;
1545
1546         rc = req_capsule_server_pack(&req->rq_pill);
1547         if (rc)
1548                 RETURN(rc);
1549
1550         /* Keep the rq_export around so we can send the reply. */
1551         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1552
1553         RETURN(0);
1554 }
1555
1556 void target_destroy_export(struct obd_export *exp)
1557 {
1558         struct obd_import *imp = NULL;
1559         /*
1560          * exports created from last_rcvd data, and "fake"
1561          * exports created by lctl don't have an import
1562          */
1563         spin_lock(&exp->exp_lock);
1564         if (exp->exp_imp_reverse != NULL) {
1565                 imp = exp->exp_imp_reverse;
1566                 exp->exp_imp_reverse = NULL;
1567         }
1568         spin_unlock(&exp->exp_lock);
1569         if (imp != NULL)
1570                 client_destroy_import(imp);
1571
1572         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1573         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1574         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1575         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1576 }
1577 EXPORT_SYMBOL(target_destroy_export);
1578
1579 /*
1580  * Recovery functions
1581  */
1582 static void target_request_copy_get(struct ptlrpc_request *req)
1583 {
1584         class_export_rpc_inc(req->rq_export);
1585         LASSERT(list_empty(&req->rq_list));
1586         INIT_LIST_HEAD(&req->rq_replay_list);
1587
1588         /* Increase refcount to keep request in queue. */
1589         atomic_inc(&req->rq_refcount);
1590         /* Let export know it has replays to be handled. */
1591         atomic_inc(&req->rq_export->exp_replay_count);
1592 }
1593
1594 static void target_request_copy_put(struct ptlrpc_request *req)
1595 {
1596         LASSERT(list_empty(&req->rq_replay_list));
1597         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1598
1599         atomic_dec(&req->rq_export->exp_replay_count);
1600         class_export_rpc_dec(req->rq_export);
1601         ptlrpc_server_drop_request(req);
1602 }
1603
1604 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1605 {
1606         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1607         struct obd_export *exp = req->rq_export;
1608         struct ptlrpc_request *reqiter;
1609         struct ptlrpc_request *dup_req = NULL;
1610         int dup = 0;
1611
1612         LASSERT(exp);
1613
1614         spin_lock(&exp->exp_lock);
1615         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1616                             rq_replay_list) {
1617                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1618                         dup_req = reqiter;
1619                         dup = 1;
1620                         break;
1621                 }
1622         }
1623
1624         if (dup) {
1625                 /* We expect it with RESENT and REPLAY flags. */
1626                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1627                     (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1628                         CERROR("invalid flags %x of resent replay\n",
1629                                lustre_msg_get_flags(req->rq_reqmsg));
1630
1631                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1632                         __u32 new_conn;
1633
1634                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1635                         if (new_conn >
1636                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1637                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1638                                                         new_conn);
1639                 }
1640         } else {
1641                 list_add_tail(&req->rq_replay_list,
1642                               &exp->exp_req_replay_queue);
1643         }
1644
1645         spin_unlock(&exp->exp_lock);
1646         return dup;
1647 }
1648
1649 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1650 {
1651         LASSERT(!list_empty(&req->rq_replay_list));
1652         LASSERT(req->rq_export);
1653
1654         spin_lock(&req->rq_export->exp_lock);
1655         list_del_init(&req->rq_replay_list);
1656         spin_unlock(&req->rq_export->exp_lock);
1657 }
1658
1659 static void target_finish_recovery(struct lu_target *lut)
1660 {
1661         struct obd_device *obd = lut->lut_obd;
1662
1663         ENTRY;
1664
1665         /* Only log a recovery message when recovery has occurred. */
1666         if (obd->obd_recovery_start) {
1667                 time64_t now = ktime_get_seconds();
1668                 time64_t elapsed_time;
1669
1670                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start,
1671                                      1);
1672                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients %d recovered and %d %s evicted.\n",
1673                               obd->obd_name, elapsed_time / 60,
1674                               elapsed_time % 60,
1675                               atomic_read(&obd->obd_max_recoverable_clients),
1676                               atomic_read(&obd->obd_connected_clients),
1677                               obd->obd_stale_clients,
1678                               obd->obd_stale_clients == 1 ? "was" : "were");
1679         }
1680
1681         ldlm_reprocess_recovery_done(obd->obd_namespace);
1682         spin_lock(&obd->obd_recovery_task_lock);
1683         if (!list_empty(&obd->obd_req_replay_queue) ||
1684             !list_empty(&obd->obd_lock_replay_queue) ||
1685             !list_empty(&obd->obd_final_req_queue)) {
1686                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1687                        obd->obd_name,
1688                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1689                        list_empty(&obd->obd_lock_replay_queue) ? \
1690                                   "" : "lock ",
1691                        list_empty(&obd->obd_final_req_queue) ? \
1692                                   "" : "final ");
1693                 spin_unlock(&obd->obd_recovery_task_lock);
1694                 LBUG();
1695         }
1696         spin_unlock(&obd->obd_recovery_task_lock);
1697
1698         obd->obd_recovery_end = ktime_get_seconds();
1699
1700         /* When recovery finished, cleanup orphans on MDS and OST. */
1701         if (obd->obd_type && OBP(obd, postrecov)) {
1702                 int rc = OBP(obd, postrecov)(obd);
1703
1704                 if (rc < 0)
1705                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1706                                       obd->obd_name, rc);
1707         }
1708         EXIT;
1709 }
1710
1711 static void abort_req_replay_queue(struct obd_device *obd)
1712 {
1713         struct ptlrpc_request *req, *n;
1714         LIST_HEAD(abort_list);
1715
1716         spin_lock(&obd->obd_recovery_task_lock);
1717         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1718         spin_unlock(&obd->obd_recovery_task_lock);
1719         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1720                 DEBUG_REQ(D_WARNING, req, "aborted:");
1721                 req->rq_status = -ENOTCONN;
1722                 if (ptlrpc_error(req)) {
1723                         DEBUG_REQ(D_ERROR, req,
1724                                   "failed abort_req_reply; skipping");
1725                 }
1726                 target_exp_dequeue_req_replay(req);
1727                 target_request_copy_put(req);
1728         }
1729 }
1730
1731 static void abort_lock_replay_queue(struct obd_device *obd)
1732 {
1733         struct ptlrpc_request *req, *n;
1734         LIST_HEAD(abort_list);
1735
1736         spin_lock(&obd->obd_recovery_task_lock);
1737         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1738         spin_unlock(&obd->obd_recovery_task_lock);
1739         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1740                 DEBUG_REQ(D_ERROR, req, "aborted:");
1741                 req->rq_status = -ENOTCONN;
1742                 if (ptlrpc_error(req)) {
1743                         DEBUG_REQ(D_ERROR, req,
1744                                   "failed abort_lock_reply; skipping");
1745                 }
1746                 target_request_copy_put(req);
1747         }
1748 }
1749
1750 /*
1751  * Called from a cleanup function if the device is being cleaned up
1752  * forcefully.  The exports should all have been disconnected already,
1753  * the only thing left to do is
1754  * - clear the recovery flags
1755  * - cancel the timer
1756  * - free queued requests and replies, but don't send replies
1757  * Because the obd_stopping flag is set, no new requests should be received.
1758  */
1759 void target_cleanup_recovery(struct obd_device *obd)
1760 {
1761         struct ptlrpc_request *req, *n;
1762         LIST_HEAD(clean_list);
1763
1764         spin_lock(&obd->obd_dev_lock);
1765         if (!obd->obd_recovering) {
1766                 spin_unlock(&obd->obd_dev_lock);
1767                 EXIT;
1768                 return;
1769         }
1770         obd->obd_recovering = obd->obd_abort_recovery = 0;
1771         spin_unlock(&obd->obd_dev_lock);
1772
1773         spin_lock(&obd->obd_recovery_task_lock);
1774         target_cancel_recovery_timer(obd);
1775         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1776         spin_unlock(&obd->obd_recovery_task_lock);
1777
1778         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1779                 LASSERT(req->rq_reply_state == NULL);
1780                 target_exp_dequeue_req_replay(req);
1781                 target_request_copy_put(req);
1782         }
1783
1784         spin_lock(&obd->obd_recovery_task_lock);
1785         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1786         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1787         spin_unlock(&obd->obd_recovery_task_lock);
1788
1789         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1790                 LASSERT(req->rq_reply_state == NULL);
1791                 target_request_copy_put(req);
1792         }
1793
1794         EXIT;
1795 }
1796 EXPORT_SYMBOL(target_cleanup_recovery);
1797
1798 /* obd_recovery_task_lock should be held */
1799 void target_cancel_recovery_timer(struct obd_device *obd)
1800 {
1801         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1802         hrtimer_cancel(&obd->obd_recovery_timer);
1803 }
1804
1805 static void target_start_recovery_timer(struct obd_device *obd)
1806 {
1807         ktime_t delay;
1808
1809         if (obd->obd_recovery_start != 0)
1810                 return;
1811
1812         spin_lock(&obd->obd_dev_lock);
1813         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1814                 spin_unlock(&obd->obd_dev_lock);
1815                 return;
1816         }
1817
1818         LASSERT(obd->obd_recovery_timeout != 0);
1819
1820         if (obd->obd_recovery_start != 0) {
1821                 spin_unlock(&obd->obd_dev_lock);
1822                 return;
1823         }
1824
1825         obd->obd_recovery_start = ktime_get_seconds();
1826         delay = ktime_set(obd->obd_recovery_start +
1827                           obd->obd_recovery_timeout, 0);
1828         hrtimer_start(&obd->obd_recovery_timer, delay, HRTIMER_MODE_ABS);
1829         spin_unlock(&obd->obd_dev_lock);
1830
1831         LCONSOLE_WARN("%s: Will be in recovery for at least %u:%02u, or until %d client%s reconnect%s\n",
1832                       obd->obd_name,
1833                       obd->obd_recovery_timeout / 60,
1834                       obd->obd_recovery_timeout % 60,
1835                       atomic_read(&obd->obd_max_recoverable_clients),
1836                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1837                       "" : "s",
1838                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1839                       "s" : "");
1840 }
1841
1842 /**
1843  * extend recovery window.
1844  *
1845  * if @extend is true, extend recovery window to have @dr_timeout remaining
1846  * at least; otherwise, make sure the recovery timeout value is not less
1847  * than @dr_timeout.
1848  */
1849 static void extend_recovery_timer(struct obd_device *obd, timeout_t dr_timeout,
1850                                   bool extend)
1851 {
1852         ktime_t left_ns;
1853         timeout_t timeout;
1854         timeout_t left;
1855
1856         spin_lock(&obd->obd_dev_lock);
1857         if (!obd->obd_recovering || obd->obd_abort_recovery ||
1858             obd->obd_stopping) {
1859                 spin_unlock(&obd->obd_dev_lock);
1860                 return;
1861         }
1862         LASSERT(obd->obd_recovery_start != 0);
1863
1864         left_ns = hrtimer_expires_remaining(&obd->obd_recovery_timer);
1865         left = ktime_divns(left_ns, NSEC_PER_SEC);
1866
1867         if (extend) {
1868                 timeout = obd->obd_recovery_timeout;
1869                 /* dr_timeout will happen after the hrtimer has expired.
1870                  * Add the excess time to the soft recovery timeout without
1871                  * exceeding the hard recovery timeout.
1872                  */
1873                 if (dr_timeout > left) {
1874                         timeout += dr_timeout - left;
1875                         timeout = min_t(timeout_t, obd->obd_recovery_time_hard,
1876                                         timeout);
1877                 }
1878         } else {
1879                 timeout = clamp_t(timeout_t, dr_timeout,
1880                                   obd->obd_recovery_timeout,
1881                                   obd->obd_recovery_time_hard);
1882         }
1883
1884         if (timeout == obd->obd_recovery_time_hard)
1885                 CWARN("%s: extended recovery timer reached hard limit: %d, extend: %d\n",
1886                       obd->obd_name, timeout, extend);
1887
1888         if (obd->obd_recovery_timeout < timeout) {
1889                 ktime_t end, now;
1890
1891                 obd->obd_recovery_timeout = timeout;
1892                 end = ktime_set(obd->obd_recovery_start + timeout, 0);
1893                 now = ktime_set(ktime_get_seconds(), 0);
1894                 left_ns = ktime_sub(end, now);
1895                 hrtimer_start(&obd->obd_recovery_timer, end, HRTIMER_MODE_ABS);
1896                 left = ktime_divns(left_ns, NSEC_PER_SEC);
1897         }
1898         spin_unlock(&obd->obd_dev_lock);
1899
1900         CDEBUG(D_HA, "%s: recovery timer will expire in %d seconds\n",
1901                 obd->obd_name, left);
1902 }
1903
1904 /* Reset the timer with each new client connection */
1905 /*
1906  * This timer is actually reconnect_timer, which is for making sure
1907  * the total recovery window is at least as big as my reconnect
1908  * attempt timing. So the initial recovery time_out will be set to
1909  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1910  * from client is bigger than this, then the recovery time_out will
1911  * be extended to make sure the client could be reconnected, in the
1912  * process, the timeout from the new client should be ignored.
1913  */
1914 static void
1915 check_and_start_recovery_timer(struct obd_device *obd,
1916                                struct ptlrpc_request *req,
1917                                int new_client)
1918 {
1919         timeout_t service_timeout = lustre_msg_get_service_timeout(req->rq_reqmsg);
1920         struct obd_device_target *obt = &obd->u.obt;
1921
1922         if (!new_client && service_timeout)
1923                 /*
1924                  * Teach server about old server's estimates, as first guess
1925                  * at how long new requests will take.
1926                  */
1927                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
1928                             service_timeout);
1929
1930         target_start_recovery_timer(obd);
1931
1932         /*
1933          * Convert the service time to RPC timeout,
1934          * and reuse service_timeout to limit stack usage.
1935          */
1936         service_timeout = at_est2timeout(service_timeout);
1937
1938         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
1939             service_timeout < at_extra)
1940                 service_timeout = at_extra;
1941
1942         /*
1943          * We expect other clients to timeout within service_timeout, then try
1944          * to reconnect, then try the failover server.  The max delay between
1945          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL.
1946          */
1947         service_timeout += 2 * INITIAL_CONNECT_TIMEOUT;
1948
1949         LASSERT(obt->obt_magic == OBT_MAGIC);
1950         service_timeout += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
1951         if (service_timeout > obd->obd_recovery_timeout && !new_client)
1952                 extend_recovery_timer(obd, service_timeout, false);
1953 }
1954
1955 /** Health checking routines */
1956 static inline int exp_connect_healthy(struct obd_export *exp)
1957 {
1958         return exp->exp_in_recovery;
1959 }
1960
1961 /** if export done req_replay or has replay in queue */
1962 static inline int exp_req_replay_healthy(struct obd_export *exp)
1963 {
1964         return (!exp->exp_req_replay_needed ||
1965                 atomic_read(&exp->exp_replay_count) > 0);
1966 }
1967
1968
1969 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
1970 {
1971         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1972                exp_req_replay_healthy(exp);
1973 }
1974
1975 /** if export done lock_replay or has replay in queue */
1976 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1977 {
1978         return (!exp->exp_lock_replay_needed ||
1979                 atomic_read(&exp->exp_replay_count) > 0);
1980 }
1981
1982 static inline int exp_vbr_healthy(struct obd_export *exp)
1983 {
1984         return !exp->exp_vbr_failed;
1985 }
1986
1987 static inline int exp_finished(struct obd_export *exp)
1988 {
1989         return exp->exp_in_recovery && !exp->exp_lock_replay_needed;
1990 }
1991
1992 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
1993 {
1994         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1995                 exp_finished(exp);
1996 }
1997
1998 static int check_for_next_transno(struct lu_target *lut)
1999 {
2000         struct ptlrpc_request *req = NULL;
2001         struct obd_device *obd = lut->lut_obd;
2002         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2003         int wake_up = 0, connected, completed, queue_len;
2004         __u64 req_transno = 0;
2005         __u64 update_transno = 0;
2006         __u64 next_transno = 0;
2007
2008         ENTRY;
2009
2010         spin_lock(&obd->obd_recovery_task_lock);
2011         if (!list_empty(&obd->obd_req_replay_queue)) {
2012                 req = list_entry(obd->obd_req_replay_queue.next,
2013                                      struct ptlrpc_request, rq_list);
2014                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
2015         }
2016
2017         if (tdtd != NULL)
2018                 update_transno = distribute_txn_get_next_transno(tdtd);
2019
2020         connected = atomic_read(&obd->obd_connected_clients);
2021         completed = connected - atomic_read(&obd->obd_req_replay_clients);
2022         queue_len = obd->obd_requests_queued_for_recovery;
2023         next_transno = obd->obd_next_recovery_transno;
2024
2025         CDEBUG(D_HA,
2026                "max: %d, connected: %d, completed: %d, queue_len: %d, req_transno: %llu, next_transno: %llu\n",
2027                atomic_read(&obd->obd_max_recoverable_clients),
2028                connected, completed,
2029                queue_len, req_transno, next_transno);
2030
2031         if (obd->obd_abort_recovery) {
2032                 CDEBUG(D_HA, "waking for aborted recovery\n");
2033                 wake_up = 1;
2034         } else if (obd->obd_recovery_expired) {
2035                 CDEBUG(D_HA, "waking for expired recovery\n");
2036                 wake_up = 1;
2037         } else if (tdtd != NULL && req != NULL &&
2038                    is_req_replayed_by_update(req)) {
2039                 LASSERTF(req_transno < next_transno,
2040                          "req_transno %llu next_transno%llu\n", req_transno,
2041                          next_transno);
2042                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
2043                        req_transno);
2044                 wake_up = 1;
2045         } else if (req_transno == next_transno ||
2046                    (update_transno != 0 && update_transno <= next_transno)) {
2047                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
2048                 wake_up = 1;
2049         } else if (queue_len > 0 &&
2050                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
2051                 /** handle gaps occured due to lost reply or VBR */
2052                 LASSERTF(req_transno >= next_transno,
2053                          "req_transno: %llu, next_transno: %llu\n",
2054                          req_transno, next_transno);
2055                 CDEBUG(D_HA,
2056                        "%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",
2057                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
2058                        next_transno, queue_len, completed, connected,
2059                        req_transno, update_transno, obd->obd_last_committed);
2060                 obd->obd_next_recovery_transno = req_transno;
2061                 wake_up = 1;
2062         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
2063                 CDEBUG(D_HA, "waking for completed recovery\n");
2064                 wake_up = 1;
2065         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
2066                 CDEBUG(D_HA,
2067                        "accepting transno gaps is explicitly allowed by fail_lock, waking up (%lld)\n",
2068                        next_transno);
2069                 obd->obd_next_recovery_transno = req_transno;
2070                 wake_up = 1;
2071         }
2072         spin_unlock(&obd->obd_recovery_task_lock);
2073         return wake_up;
2074 }
2075
2076 static int check_for_next_lock(struct lu_target *lut)
2077 {
2078         struct obd_device *obd = lut->lut_obd;
2079         int wake_up = 0;
2080
2081         spin_lock(&obd->obd_recovery_task_lock);
2082         if (!list_empty(&obd->obd_lock_replay_queue)) {
2083                 CDEBUG(D_HA, "waking for next lock\n");
2084                 wake_up = 1;
2085         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
2086                 CDEBUG(D_HA, "waking for completed lock replay\n");
2087                 wake_up = 1;
2088         } else if (obd->obd_abort_recovery) {
2089                 CDEBUG(D_HA, "waking for aborted recovery\n");
2090                 wake_up = 1;
2091         } else if (obd->obd_recovery_expired) {
2092                 CDEBUG(D_HA, "waking for expired recovery\n");
2093                 wake_up = 1;
2094         }
2095         spin_unlock(&obd->obd_recovery_task_lock);
2096
2097         return wake_up;
2098 }
2099
2100 /**
2101  * wait for recovery events,
2102  * check its status with help of check_routine
2103  * evict dead clients via health_check
2104  */
2105 static int target_recovery_overseer(struct lu_target *lut,
2106                                     int (*check_routine)(struct lu_target *),
2107                                     int (*health_check)(struct obd_export *))
2108 {
2109         struct obd_device *obd = lut->lut_obd;
2110         struct target_distribute_txn_data *tdtd;
2111         time64_t last = 0;
2112         time64_t now;
2113 repeat:
2114         if (obd->obd_recovering && obd->obd_recovery_start == 0) {
2115                 now = ktime_get_seconds();
2116                 if (now - last > 600) {
2117                         LCONSOLE_INFO("%s: in recovery but waiting for the first client to connect\n",
2118                                       obd->obd_name);
2119                         last = now;
2120                 }
2121         }
2122         if (obd->obd_recovery_start != 0 && ktime_get_seconds() >=
2123               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
2124                 __u64 next_update_transno = 0;
2125
2126                 /*
2127                  * Only abort the recovery if there are no update recovery
2128                  * left in the queue
2129                  */
2130                 spin_lock(&obd->obd_recovery_task_lock);
2131                 if (lut->lut_tdtd != NULL) {
2132                         next_update_transno =
2133                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2134
2135                         tdtd = lut->lut_tdtd;
2136                         /*
2137                          * If next_update_transno == 0, it probably because
2138                          * updatelog retrieve threads did not get any records
2139                          * yet, let's wait those threads stopped
2140                          */
2141                         if (next_update_transno == 0) {
2142                                 spin_unlock(&obd->obd_recovery_task_lock);
2143                                 wait_event_idle(
2144                                         tdtd->tdtd_recovery_threads_waitq,
2145                                         atomic_read(&tdtd->tdtd_recovery_threads_count)
2146                                         == 0);
2147
2148                                 spin_lock(&obd->obd_recovery_task_lock);
2149                                 next_update_transno =
2150                                         distribute_txn_get_next_transno(
2151                                                                 lut->lut_tdtd);
2152                         }
2153                 }
2154
2155                 if (next_update_transno != 0 && !obd->obd_abort_recovery) {
2156                         obd->obd_next_recovery_transno = next_update_transno;
2157                         spin_unlock(&obd->obd_recovery_task_lock);
2158                         /*
2159                          * Disconnect unfinished exports from clients, and
2160                          * keep connection from MDT to make sure the update
2161                          * recovery will still keep trying until some one
2162                          * manually abort the recovery
2163                          */
2164                         class_disconnect_stale_exports(obd,
2165                                                 exp_finished_or_from_mdt);
2166                         /* Abort all of replay & replay lock req from clients */
2167                         abort_req_replay_queue(obd);
2168                         abort_lock_replay_queue(obd);
2169                         CDEBUG(D_HA,
2170                                "%s: there are still update replay (%#llx)in the queue.\n",
2171                                obd->obd_name, next_update_transno);
2172                 } else {
2173                         obd->obd_abort_recovery = 1;
2174                         spin_unlock(&obd->obd_recovery_task_lock);
2175                         CWARN("%s recovery is aborted by hard timeout\n",
2176                               obd->obd_name);
2177                 }
2178         }
2179
2180         while (wait_event_timeout(obd->obd_next_transno_waitq,
2181                                   check_routine(lut),
2182                                   cfs_time_seconds(60)) == 0)
2183                 ; /* wait indefinitely for event, but don't trigger watchdog */
2184
2185         if (obd->obd_abort_recovery) {
2186                 CWARN("recovery is aborted, evict exports in recovery\n");
2187                 if (lut->lut_tdtd != NULL) {
2188                         tdtd = lut->lut_tdtd;
2189                         /*
2190                          * Let's wait all of the update log recovery thread
2191                          * finished
2192                          */
2193                         wait_event_idle(
2194                                 tdtd->tdtd_recovery_threads_waitq,
2195                                 atomic_read(&tdtd->tdtd_recovery_threads_count)
2196                                 == 0);
2197                         /* Then abort the update recovery list */
2198                         dtrq_list_destroy(lut->lut_tdtd);
2199                 }
2200
2201                 /** evict exports which didn't finish recovery yet */
2202                 class_disconnect_stale_exports(obd, exp_finished);
2203                 return 1;
2204         } else if (obd->obd_recovery_expired &&
2205                    obd->obd_recovery_timeout < obd->obd_recovery_time_hard) {
2206                 obd->obd_recovery_expired = 0;
2207
2208                 /** If some clients died being recovered, evict them */
2209                 LCONSOLE_WARN("%s: recovery is timed out, evict stale exports\n",
2210                               obd->obd_name);
2211                 /** evict cexports with no replay in queue, they are stalled */
2212                 class_disconnect_stale_exports(obd, health_check);
2213
2214                 /** continue with VBR */
2215                 spin_lock(&obd->obd_dev_lock);
2216                 obd->obd_version_recov = 1;
2217                 spin_unlock(&obd->obd_dev_lock);
2218                 /**
2219                  * reset timer, recovery will proceed with versions now,
2220                  * timeout is set just to handle reconnection delays
2221                  */
2222                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2223                 /**
2224                  * Wait for recovery events again, after evicting bad clients
2225                  */
2226                 goto repeat;
2227         }
2228         return 0;
2229 }
2230
2231 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2232 {
2233         struct obd_device *obd = lut->lut_obd;
2234         struct ptlrpc_request *req = NULL;
2235
2236         CDEBUG(D_HA, "Waiting for lock\n");
2237         if (target_recovery_overseer(lut, check_for_next_lock,
2238                                      exp_lock_replay_healthy))
2239                 abort_lock_replay_queue(obd);
2240
2241         spin_lock(&obd->obd_recovery_task_lock);
2242         if (!list_empty(&obd->obd_lock_replay_queue)) {
2243                 req = list_entry(obd->obd_lock_replay_queue.next,
2244                                      struct ptlrpc_request, rq_list);
2245                 list_del_init(&req->rq_list);
2246                 spin_unlock(&obd->obd_recovery_task_lock);
2247         } else {
2248                 spin_unlock(&obd->obd_recovery_task_lock);
2249                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2250                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2251                 /** evict exports failed VBR */
2252                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2253         }
2254         return req;
2255 }
2256
2257 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2258 {
2259         struct ptlrpc_request *req = NULL;
2260
2261         spin_lock(&obd->obd_recovery_task_lock);
2262         if (!list_empty(&obd->obd_final_req_queue)) {
2263                 req = list_entry(obd->obd_final_req_queue.next,
2264                                      struct ptlrpc_request, rq_list);
2265                 list_del_init(&req->rq_list);
2266                 spin_unlock(&obd->obd_recovery_task_lock);
2267                 if (req->rq_export->exp_in_recovery) {
2268                         spin_lock(&req->rq_export->exp_lock);
2269                         req->rq_export->exp_in_recovery = 0;
2270                         spin_unlock(&req->rq_export->exp_lock);
2271                 }
2272         } else {
2273                 spin_unlock(&obd->obd_recovery_task_lock);
2274         }
2275         return req;
2276 }
2277
2278 static void handle_recovery_req(struct ptlrpc_thread *thread,
2279                                 struct ptlrpc_request *req,
2280                                 svc_handler_t handler)
2281 {
2282         ENTRY;
2283
2284         /**
2285          * export can be evicted during recovery, no need to handle replays for
2286          * it after that, discard such request silently
2287          */
2288         if (req->rq_export->exp_disconnected)
2289                 RETURN_EXIT;
2290
2291         req->rq_session.lc_thread = thread;
2292         req->rq_svc_thread = thread;
2293         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2294
2295         /* thread context */
2296         lu_context_enter(&thread->t_env->le_ctx);
2297         (void)handler(req);
2298         lu_context_exit(&thread->t_env->le_ctx);
2299
2300         req->rq_svc_thread->t_env->le_ses = NULL;
2301
2302         /* don't reset timer for final stage */
2303         if (!exp_finished(req->rq_export)) {
2304                 timeout_t timeout = obd_timeout;
2305
2306                 /**
2307                  * Add request @timeout to the recovery time so next request from
2308                  * this client may come in recovery time
2309                  */
2310                 if (!AT_OFF) {
2311                         struct ptlrpc_service_part *svcpt;
2312                         timeout_t est_timeout;
2313
2314                         svcpt = req->rq_rqbd->rqbd_svcpt;
2315                         /*
2316                          * If the server sent early reply for this request,
2317                          * the client will recalculate the timeout according to
2318                          * current server estimate service time, so we will
2319                          * use the maxium timeout here for waiting the client
2320                          * sending the next req
2321                          */
2322                         est_timeout = at_get(&svcpt->scp_at_estimate);
2323                         timeout = max_t(timeout_t, at_est2timeout(est_timeout),
2324                                         lustre_msg_get_timeout(req->rq_reqmsg));
2325                         /*
2326                          * Add 2 net_latency, one for balance rq_deadline
2327                          * (see ptl_send_rpc), one for resend the req to server,
2328                          * Note: client will pack net_latency in replay req
2329                          * (see ptlrpc_replay_req)
2330                          */
2331                         timeout += 2 * lustre_msg_get_service_timeout(req->rq_reqmsg);
2332                 }
2333                 extend_recovery_timer(class_exp2obd(req->rq_export), timeout,
2334                                       true);
2335         }
2336         EXIT;
2337 }
2338
2339 /** Checking routines for recovery */
2340 static int check_for_recovery_ready(struct lu_target *lut)
2341 {
2342         struct obd_device *obd = lut->lut_obd;
2343         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2344
2345         CDEBUG(D_HA,
2346                "connected %d stale %d max_recoverable_clients %d abort %d expired %d\n",
2347                clnts, obd->obd_stale_clients,
2348                atomic_read(&obd->obd_max_recoverable_clients),
2349                obd->obd_abort_recovery, obd->obd_recovery_expired);
2350
2351         if (!obd->obd_abort_recovery && !obd->obd_recovery_expired) {
2352                 LASSERT(clnts <=
2353                         atomic_read(&obd->obd_max_recoverable_clients));
2354                 if (clnts + obd->obd_stale_clients <
2355                     atomic_read(&obd->obd_max_recoverable_clients))
2356                         return 0;
2357         }
2358
2359         if (lut->lut_tdtd != NULL) {
2360                 if (!lut->lut_tdtd->tdtd_replay_ready &&
2361                     !obd->obd_abort_recovery && !obd->obd_stopping) {
2362                         /*
2363                          * Let's extend recovery timer, in case the recovery
2364                          * timer expired, and some clients got evicted
2365                          */
2366                         extend_recovery_timer(obd, obd->obd_recovery_timeout,
2367                                               true);
2368                         CDEBUG(D_HA,
2369                                "%s update recovery is not ready, extend recovery %d\n",
2370                                obd->obd_name, obd->obd_recovery_timeout);
2371                         return 0;
2372                 }
2373         }
2374
2375         return 1;
2376 }
2377
2378 enum {
2379         REQUEST_RECOVERY = 1,
2380         UPDATE_RECOVERY = 2,
2381 };
2382
2383 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2384 {
2385         __u64 transno = 0;
2386
2387         if (!list_empty(&obd->obd_req_replay_queue)) {
2388                 struct ptlrpc_request *req;
2389
2390                 req = list_entry(obd->obd_req_replay_queue.next,
2391                                  struct ptlrpc_request, rq_list);
2392                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2393         }
2394
2395         return transno;
2396 }
2397
2398 static __u64 get_next_transno(struct lu_target *lut, int *type)
2399 {
2400         struct obd_device *obd = lut->lut_obd;
2401         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2402         __u64 transno = 0;
2403         __u64 update_transno;
2404
2405         ENTRY;
2406
2407         transno = get_next_replay_req_transno(obd);
2408         if (type != NULL)
2409                 *type = REQUEST_RECOVERY;
2410
2411         if (tdtd == NULL)
2412                 RETURN(transno);
2413
2414         update_transno = distribute_txn_get_next_transno(tdtd);
2415         if (transno == 0 || (transno >= update_transno &&
2416                              update_transno != 0)) {
2417                 transno = update_transno;
2418                 if (type != NULL)
2419                         *type = UPDATE_RECOVERY;
2420         }
2421
2422         RETURN(transno);
2423 }
2424
2425 /**
2426  * drop duplicate replay request
2427  *
2428  * Because the operation has been replayed by update recovery, the request
2429  * with the same transno will be dropped and also notify the client to send
2430  * next replay request.
2431  *
2432  * \param[in] env       execution environment
2433  * \param[in] obd       failover obd device
2434  * \param[in] req       request to be dropped
2435  */
2436 static void drop_duplicate_replay_req(struct lu_env *env,
2437                                       struct obd_device *obd,
2438                                       struct ptlrpc_request *req)
2439 {
2440         DEBUG_REQ(D_HA, req,
2441                   "remove t%lld from %s because duplicate update records found",
2442                   lustre_msg_get_transno(req->rq_reqmsg),
2443                   libcfs_nid2str(req->rq_peer.nid));
2444
2445         /*
2446          * Right now, only for MDS reint operation update replay and
2447          * normal request replay can have the same transno
2448          */
2449         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT) {
2450                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2451                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2452                 if (likely(req->rq_export))
2453                         target_committed_to_req(req);
2454                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2455                 target_send_reply(req, req->rq_status, 0);
2456         } else {
2457                 DEBUG_REQ(D_ERROR, req, "wrong opc from %s",
2458                 libcfs_nid2str(req->rq_peer.nid));
2459         }
2460         target_exp_dequeue_req_replay(req);
2461         target_request_copy_put(req);
2462         obd->obd_replayed_requests++;
2463 }
2464
2465 static void replay_request_or_update(struct lu_env *env,
2466                                      struct lu_target *lut,
2467                                      struct target_recovery_data *trd,
2468                                      struct ptlrpc_thread *thread)
2469 {
2470         struct obd_device *obd = lut->lut_obd;
2471         struct ptlrpc_request *req = NULL;
2472         int type;
2473         __u64 transno;
2474
2475         ENTRY;
2476
2477         CDEBUG(D_HA, "Waiting for transno %lld\n",
2478                obd->obd_next_recovery_transno);
2479
2480         /* Replay all of request and update by transno */
2481         do {
2482                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2483
2484                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2485
2486                 /**
2487                  * It is needed to extend recovery window above
2488                  *  recovery_time_soft. Extending is possible only in the
2489                  *  end of recovery window (see more details in
2490                  *  handle_recovery_req()).
2491                  */
2492                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2493
2494                 if (target_recovery_overseer(lut, check_for_next_transno,
2495                                         exp_req_replay_healthy_or_from_mdt)) {
2496                         abort_req_replay_queue(obd);
2497                         abort_lock_replay_queue(obd);
2498                         goto abort;
2499                 }
2500
2501                 spin_lock(&obd->obd_recovery_task_lock);
2502                 transno = get_next_transno(lut, &type);
2503                 if (type == REQUEST_RECOVERY && transno != 0) {
2504                         /*
2505                          * Drop replay request from client side, if the
2506                          * replay has been executed by update with the
2507                          * same transno
2508                          */
2509                         req = list_entry(obd->obd_req_replay_queue.next,
2510                                         struct ptlrpc_request, rq_list);
2511
2512                         list_del_init(&req->rq_list);
2513                         obd->obd_requests_queued_for_recovery--;
2514                         spin_unlock(&obd->obd_recovery_task_lock);
2515
2516                         /*
2517                          * Let's check if the request has been redone by
2518                          * update replay
2519                          */
2520                         if (is_req_replayed_by_update(req)) {
2521                                 struct distribute_txn_replay_req *dtrq;
2522
2523                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2524                                                                       transno);
2525                                 LASSERT(dtrq != NULL);
2526                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2527                                 list_del_init(&dtrq->dtrq_list);
2528                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2529                                 dtrq_destroy(dtrq);
2530
2531                                 drop_duplicate_replay_req(env, obd, req);
2532
2533                                 continue;
2534                         }
2535
2536                         LASSERT(trd->trd_processing_task == current->pid);
2537                         DEBUG_REQ(D_HA, req, "processing x%llu t%lld from %s",
2538                                   req->rq_xid,
2539                                   lustre_msg_get_transno(req->rq_reqmsg),
2540                                   libcfs_nid2str(req->rq_peer.nid));
2541
2542                         handle_recovery_req(thread, req,
2543                                             trd->trd_recovery_handler);
2544                         /**
2545                          * bz18031: increase next_recovery_transno before
2546                          * target_request_copy_put() will drop exp_rpc reference
2547                          */
2548                         spin_lock(&obd->obd_recovery_task_lock);
2549                         obd->obd_next_recovery_transno++;
2550                         spin_unlock(&obd->obd_recovery_task_lock);
2551                         target_exp_dequeue_req_replay(req);
2552                         target_request_copy_put(req);
2553                         obd->obd_replayed_requests++;
2554                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2555                         struct distribute_txn_replay_req *dtrq;
2556                         int rc;
2557
2558                         spin_unlock(&obd->obd_recovery_task_lock);
2559
2560                         LASSERT(tdtd != NULL);
2561                         dtrq = distribute_txn_get_next_req(tdtd);
2562                         lu_context_enter(&thread->t_env->le_ctx);
2563                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2564                         lu_context_exit(&thread->t_env->le_ctx);
2565                         extend_recovery_timer(obd, obd_timeout, true);
2566
2567                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2568                                 CDEBUG(D_HA,
2569                                        "Move x%llu t%llu to finish list\n",
2570                                        dtrq->dtrq_xid,
2571                                        dtrq->dtrq_master_transno);
2572
2573                                 /* Add it to the replay finish list */
2574                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2575                                 list_add(&dtrq->dtrq_list,
2576                                          &tdtd->tdtd_replay_finish_list);
2577                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2578
2579                                 spin_lock(&obd->obd_recovery_task_lock);
2580                                 if (transno == obd->obd_next_recovery_transno)
2581                                         obd->obd_next_recovery_transno++;
2582                                 else if (transno >
2583                                          obd->obd_next_recovery_transno)
2584                                         obd->obd_next_recovery_transno =
2585                                                                 transno + 1;
2586                                 spin_unlock(&obd->obd_recovery_task_lock);
2587                         } else {
2588                                 dtrq_destroy(dtrq);
2589                         }
2590                 } else {
2591                         spin_unlock(&obd->obd_recovery_task_lock);
2592 abort:
2593                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2594                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2595                         /** evict exports failed VBR */
2596                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2597                         break;
2598                 }
2599         } while (1);
2600 }
2601
2602 static int target_recovery_thread(void *arg)
2603 {
2604         struct lu_target *lut = arg;
2605         struct obd_device *obd = lut->lut_obd;
2606         struct ptlrpc_request *req;
2607         struct target_recovery_data *trd = &obd->obd_recovery_data;
2608         unsigned long delta;
2609         struct lu_env *env;
2610         struct ptlrpc_thread *thread = NULL;
2611         int rc = 0;
2612
2613         ENTRY;
2614
2615         unshare_fs_struct();
2616         OBD_ALLOC_PTR(thread);
2617         if (thread == NULL)
2618                 RETURN(-ENOMEM);
2619
2620         OBD_ALLOC_PTR(env);
2621         if (env == NULL)
2622                 GOTO(out_thread, rc = -ENOMEM);
2623         rc = lu_env_add(env);
2624         if (rc)
2625                 GOTO(out_env, rc);
2626
2627         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2628         if (rc)
2629                 GOTO(out_env_remove, rc);
2630
2631         thread->t_env = env;
2632         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2633         env->le_ctx.lc_thread = thread;
2634         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2635
2636         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2637                current->pid);
2638         trd->trd_processing_task = current->pid;
2639
2640         spin_lock(&obd->obd_dev_lock);
2641         obd->obd_recovering = 1;
2642         spin_unlock(&obd->obd_dev_lock);
2643         complete(&trd->trd_starting);
2644
2645         /* first of all, we have to know the first transno to replay */
2646         if (target_recovery_overseer(lut, check_for_recovery_ready,
2647                                      exp_connect_healthy)) {
2648                 abort_req_replay_queue(obd);
2649                 abort_lock_replay_queue(obd);
2650                 if (lut->lut_tdtd != NULL)
2651                         dtrq_list_destroy(lut->lut_tdtd);
2652         }
2653
2654         /* next stage: replay requests or update */
2655         delta = jiffies;
2656         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2657                atomic_read(&obd->obd_req_replay_clients),
2658                obd->obd_next_recovery_transno);
2659         replay_request_or_update(env, lut, trd, thread);
2660
2661         /**
2662          * The second stage: replay locks
2663          */
2664         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2665                atomic_read(&obd->obd_lock_replay_clients));
2666         while ((req = target_next_replay_lock(lut))) {
2667                 LASSERT(trd->trd_processing_task == current->pid);
2668                 DEBUG_REQ(D_HA, req, "processing lock from %s:",
2669                           libcfs_nid2str(req->rq_peer.nid));
2670                 handle_recovery_req(thread, req,
2671                                     trd->trd_recovery_handler);
2672                 target_request_copy_put(req);
2673                 obd->obd_replayed_locks++;
2674         }
2675
2676         /**
2677          * The third stage: reply on final pings, at this moment all clients
2678          * must have request in final queue
2679          */
2680         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2681         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2682         /** Update server last boot epoch */
2683         tgt_boot_epoch_update(lut);
2684         /*
2685          * We drop recoverying flag to forward all new requests
2686          * to regular mds_handle() since now
2687          */
2688         spin_lock(&obd->obd_dev_lock);
2689         obd->obd_recovering = obd->obd_abort_recovery = 0;
2690         spin_unlock(&obd->obd_dev_lock);
2691         spin_lock(&obd->obd_recovery_task_lock);
2692         target_cancel_recovery_timer(obd);
2693         spin_unlock(&obd->obd_recovery_task_lock);
2694         while ((req = target_next_final_ping(obd))) {
2695                 LASSERT(trd->trd_processing_task == current->pid);
2696                 DEBUG_REQ(D_HA, req, "processing final ping from %s:",
2697                           libcfs_nid2str(req->rq_peer.nid));
2698                 handle_recovery_req(thread, req,
2699                                     trd->trd_recovery_handler);
2700                 /*
2701                  * Because the waiting client can not send ping to server,
2702                  * so we need refresh the last_request_time, to avoid the
2703                  * export is being evicted
2704                  */
2705                 ptlrpc_update_export_timer(req->rq_export, 0);
2706                 target_request_copy_put(req);
2707         }
2708
2709         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2710         CDEBUG(D_INFO, "4: recovery completed in %lus - %d/%d reqs/locks\n",
2711                delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2712         if (delta > OBD_RECOVERY_TIME_SOFT) {
2713                 CWARN("too long recovery - read logs\n");
2714                 libcfs_debug_dumplog();
2715         }
2716
2717         target_finish_recovery(lut);
2718         lu_context_fini(&env->le_ctx);
2719         trd->trd_processing_task = 0;
2720         complete_all(&trd->trd_finishing);
2721         tgt_io_thread_done(thread);
2722 out_env_remove:
2723         lu_env_remove(env);
2724 out_env:
2725         OBD_FREE_PTR(env);
2726 out_thread:
2727         OBD_FREE_PTR(thread);
2728         RETURN(rc);
2729 }
2730
2731 static int target_start_recovery_thread(struct lu_target *lut,
2732                                         svc_handler_t handler)
2733 {
2734         struct obd_device *obd = lut->lut_obd;
2735         int rc = 0;
2736         struct target_recovery_data *trd = &obd->obd_recovery_data;
2737         int index;
2738
2739         memset(trd, 0, sizeof(*trd));
2740         init_completion(&trd->trd_starting);
2741         init_completion(&trd->trd_finishing);
2742         trd->trd_recovery_handler = handler;
2743
2744         rc = server_name2index(obd->obd_name, &index, NULL);
2745         if (rc < 0)
2746                 return rc;
2747
2748         if (!IS_ERR(kthread_run(target_recovery_thread,
2749                                 lut, "tgt_recover_%d", index))) {
2750                 wait_for_completion(&trd->trd_starting);
2751                 LASSERT(obd->obd_recovering != 0);
2752         } else {
2753                 rc = -ECHILD;
2754         }
2755
2756         return rc;
2757 }
2758
2759 void target_stop_recovery_thread(struct obd_device *obd)
2760 {
2761         if (obd->obd_recovery_data.trd_processing_task > 0) {
2762                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2763                 /** recovery can be done but postrecovery is not yet */
2764                 spin_lock(&obd->obd_dev_lock);
2765                 if (obd->obd_recovering) {
2766                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2767                         obd->obd_abort_recovery = 1;
2768                         wake_up(&obd->obd_next_transno_waitq);
2769                 }
2770                 spin_unlock(&obd->obd_dev_lock);
2771                 wait_for_completion(&trd->trd_finishing);
2772         }
2773 }
2774 EXPORT_SYMBOL(target_stop_recovery_thread);
2775
2776 void target_recovery_fini(struct obd_device *obd)
2777 {
2778         class_disconnect_exports(obd);
2779         target_stop_recovery_thread(obd);
2780         target_cleanup_recovery(obd);
2781 }
2782 EXPORT_SYMBOL(target_recovery_fini);
2783
2784 static enum hrtimer_restart target_recovery_expired(struct hrtimer *timer)
2785 {
2786         struct obd_device *obd = container_of(timer, struct obd_device,
2787                                               obd_recovery_timer);
2788
2789         CDEBUG(D_HA,
2790                "%s: recovery timed out; %d clients are still in recovery after %llu seconds (%d clients connected)\n",
2791                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2792                ktime_get_seconds() - obd->obd_recovery_start,
2793                atomic_read(&obd->obd_connected_clients));
2794
2795         obd->obd_recovery_expired = 1;
2796         wake_up(&obd->obd_next_transno_waitq);
2797         return HRTIMER_NORESTART;
2798 }
2799
2800 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2801 {
2802         struct obd_device *obd = lut->lut_obd;
2803
2804         if (lut->lut_bottom->dd_rdonly)
2805                 return;
2806
2807         if (atomic_read(&obd->obd_max_recoverable_clients) == 0) {
2808                 /** Update server last boot epoch */
2809                 tgt_boot_epoch_update(lut);
2810                 return;
2811         }
2812
2813         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2814                "last_transno %llu\n", obd->obd_name,
2815                atomic_read(&obd->obd_max_recoverable_clients),
2816                obd->obd_last_committed);
2817         LASSERT(obd->obd_stopping == 0);
2818         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2819         obd->obd_recovery_start = 0;
2820         obd->obd_recovery_end = 0;
2821
2822         hrtimer_init(&obd->obd_recovery_timer, CLOCK_MONOTONIC,
2823                      HRTIMER_MODE_ABS);
2824         obd->obd_recovery_timer.function = &target_recovery_expired;
2825         target_start_recovery_thread(lut, handler);
2826 }
2827 EXPORT_SYMBOL(target_recovery_init);
2828
2829 static int target_process_req_flags(struct obd_device *obd,
2830                                     struct ptlrpc_request *req)
2831 {
2832         struct obd_export *exp = req->rq_export;
2833
2834         LASSERT(exp != NULL);
2835         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2836                 /* client declares he's ready to replay locks */
2837                 spin_lock(&exp->exp_lock);
2838                 if (exp->exp_req_replay_needed) {
2839                         exp->exp_req_replay_needed = 0;
2840                         spin_unlock(&exp->exp_lock);
2841
2842                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2843                         atomic_dec(&obd->obd_req_replay_clients);
2844                 } else {
2845                         spin_unlock(&exp->exp_lock);
2846                 }
2847         }
2848         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2849                 /*
2850                  * client declares he's ready to complete recovery
2851                  * so, we put the request on th final queue
2852                  */
2853                 spin_lock(&exp->exp_lock);
2854                 if (exp->exp_lock_replay_needed) {
2855                         exp->exp_lock_replay_needed = 0;
2856                         spin_unlock(&exp->exp_lock);
2857
2858                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
2859                         atomic_dec(&obd->obd_lock_replay_clients);
2860                 } else {
2861                         spin_unlock(&exp->exp_lock);
2862                 }
2863         }
2864         return 0;
2865 }
2866
2867 int target_queue_recovery_request(struct ptlrpc_request *req,
2868                                   struct obd_device *obd)
2869 {
2870         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
2871         struct ptlrpc_request *reqiter;
2872         int inserted = 0;
2873
2874         ENTRY;
2875
2876         if (obd->obd_recovery_data.trd_processing_task == current->pid) {
2877                 /* Processing the queue right now, don't re-add. */
2878                 RETURN(1);
2879         }
2880
2881         target_process_req_flags(obd, req);
2882
2883         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2884                 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
2885                         if (cfs_fail_val == 1) {
2886                                 cfs_race_state = 1;
2887                                 cfs_fail_val = 0;
2888                                 wake_up(&cfs_race_waitq);
2889
2890                                 schedule_timeout_interruptible(
2891                                         cfs_time_seconds(1));
2892                         }
2893                 }
2894
2895                 /*
2896                  * client declares he's ready to complete recovery
2897                  * so, we put the request on th final queue
2898                  */
2899                 target_request_copy_get(req);
2900                 DEBUG_REQ(D_HA, req, "queue final req");
2901                 wake_up(&obd->obd_next_transno_waitq);
2902                 spin_lock(&obd->obd_recovery_task_lock);
2903                 if (obd->obd_recovering) {
2904                         struct ptlrpc_request *tmp;
2905                         struct ptlrpc_request *duplicate = NULL;
2906
2907                         if (likely(!req->rq_export->exp_replay_done)) {
2908                                 req->rq_export->exp_replay_done = 1;
2909                                 list_add_tail(&req->rq_list,
2910                                               &obd->obd_final_req_queue);
2911                                 spin_unlock(&obd->obd_recovery_task_lock);
2912                                 RETURN(0);
2913                         }
2914
2915                         /*
2916                          * XXX O(n), but only happens if final ping is
2917                          * timed out, probably reorganize the list as
2918                          * a hash list later
2919                          */
2920                         list_for_each_entry_safe(reqiter, tmp,
2921                                                  &obd->obd_final_req_queue,
2922                                                  rq_list) {
2923                                 if (reqiter->rq_export == req->rq_export) {
2924                                         list_del_init(&reqiter->rq_list);
2925                                         duplicate = reqiter;
2926                                         break;
2927                                 }
2928                         }
2929
2930                         list_add_tail(&req->rq_list,
2931                                       &obd->obd_final_req_queue);
2932                         req->rq_export->exp_replay_done = 1;
2933                         spin_unlock(&obd->obd_recovery_task_lock);
2934
2935                         if (duplicate != NULL) {
2936                                 DEBUG_REQ(D_HA, duplicate,
2937                                           "put prev final req");
2938                                 target_request_copy_put(duplicate);
2939                         }
2940                         RETURN(0);
2941                 } else {
2942                         spin_unlock(&obd->obd_recovery_task_lock);
2943                         target_request_copy_put(req);
2944                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
2945                 }
2946         }
2947         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2948                 /* client declares he's ready to replay locks */
2949                 target_request_copy_get(req);
2950                 DEBUG_REQ(D_HA, req, "queue lock replay req");
2951                 wake_up(&obd->obd_next_transno_waitq);
2952                 spin_lock(&obd->obd_recovery_task_lock);
2953                 LASSERT(obd->obd_recovering);
2954                 /* usually due to recovery abort */
2955                 if (!req->rq_export->exp_in_recovery) {
2956                         spin_unlock(&obd->obd_recovery_task_lock);
2957                         target_request_copy_put(req);
2958                         RETURN(-ENOTCONN);
2959                 }
2960                 LASSERT(req->rq_export->exp_lock_replay_needed);
2961                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
2962                 spin_unlock(&obd->obd_recovery_task_lock);
2963                 RETURN(0);
2964         }
2965
2966         /*
2967          * CAVEAT EMPTOR: The incoming request message has been swabbed
2968          * (i.e. buflens etc are in my own byte order), but type-dependent
2969          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed.
2970          */
2971
2972         if (!transno) {
2973                 INIT_LIST_HEAD(&req->rq_list);
2974                 DEBUG_REQ(D_HA, req, "not queueing");
2975                 RETURN(1);
2976         }
2977
2978         /*
2979          * If we're processing the queue, we want don't want to queue this
2980          * message.
2981          *
2982          * Also, if this request has a transno less than the one we're waiting
2983          * for, we should process it now.  It could (and currently always will)
2984          * be an open request for a descriptor that was opened some time ago.
2985          *
2986          * Also, a resent, replayed request that has already been
2987          * handled will pass through here and be processed immediately.
2988          */
2989         CDEBUG(D_HA,
2990                "Next recovery transno: %llu, current: %llu, replaying\n",
2991                obd->obd_next_recovery_transno, transno);
2992
2993         /*
2994          * If the request has been replayed by update replay, then sends this
2995          * request to the recovery thread (replay_request_or_update()), where
2996          * it will be handled
2997          */
2998         spin_lock(&obd->obd_recovery_task_lock);
2999         if (transno < obd->obd_next_recovery_transno &&
3000             !is_req_replayed_by_update(req)) {
3001                 /* Processing the queue right now, don't re-add. */
3002                 LASSERT(list_empty(&req->rq_list));
3003                 spin_unlock(&obd->obd_recovery_task_lock);
3004                 RETURN(1);
3005         }
3006         spin_unlock(&obd->obd_recovery_task_lock);
3007
3008         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
3009                 RETURN(0);
3010
3011         target_request_copy_get(req);
3012         if (!req->rq_export->exp_in_recovery) {
3013                 target_request_copy_put(req);
3014                 RETURN(-ENOTCONN);
3015         }
3016         LASSERT(req->rq_export->exp_req_replay_needed);
3017
3018         if (target_exp_enqueue_req_replay(req)) {
3019                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
3020                 target_request_copy_put(req);
3021                 RETURN(0);
3022         }
3023
3024         /* XXX O(n^2) */
3025         spin_lock(&obd->obd_recovery_task_lock);
3026         LASSERT(obd->obd_recovering);
3027         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
3028                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
3029                         list_add_tail(&req->rq_list, &reqiter->rq_list);
3030                         inserted = 1;
3031                         goto added;
3032                 }
3033
3034                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
3035                              transno)) {
3036                         DEBUG_REQ(D_ERROR, req,
3037                                   "dropping replay: transno has been claimed by another client");
3038                         spin_unlock(&obd->obd_recovery_task_lock);
3039                         target_exp_dequeue_req_replay(req);
3040                         target_request_copy_put(req);
3041                         RETURN(0);
3042                 }
3043         }
3044 added:
3045         if (!inserted)
3046                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
3047
3048         obd->obd_requests_queued_for_recovery++;
3049         spin_unlock(&obd->obd_recovery_task_lock);
3050         wake_up(&obd->obd_next_transno_waitq);
3051         RETURN(0);
3052 }
3053
3054 void target_committed_to_req(struct ptlrpc_request *req)
3055 {
3056         struct obd_export *exp = req->rq_export;
3057
3058         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
3059                 lustre_msg_set_last_committed(req->rq_repmsg,
3060                                               exp->exp_last_committed);
3061         else
3062                 DEBUG_REQ(D_IOCTL, req,
3063                           "not sending last_committed update (%d/%d)",
3064                           exp->exp_obd->obd_no_transno,
3065                           req->rq_repmsg == NULL);
3066
3067         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
3068                exp->exp_last_committed, req->rq_transno, req->rq_xid);
3069 }
3070
3071 #endif /* HAVE_SERVER_SUPPORT */
3072
3073 /**
3074  * Packs current SLV and Limit into \a req.
3075  */
3076 int target_pack_pool_reply(struct ptlrpc_request *req)
3077 {
3078         struct obd_device *obd;
3079
3080         ENTRY;
3081
3082         /*
3083          * Check that we still have all structures alive as this may
3084          * be some late RPC at shutdown time.
3085          */
3086         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
3087                      !exp_connect_lru_resize(req->rq_export))) {
3088                 lustre_msg_set_slv(req->rq_repmsg, 0);
3089                 lustre_msg_set_limit(req->rq_repmsg, 0);
3090                 RETURN(0);
3091         }
3092
3093         /* OBD is alive here as export is alive, which we checked above. */
3094         obd = req->rq_export->exp_obd;
3095
3096         read_lock(&obd->obd_pool_lock);
3097         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
3098         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
3099         read_unlock(&obd->obd_pool_lock);
3100
3101         RETURN(0);
3102 }
3103
3104 static int target_send_reply_msg(struct ptlrpc_request *req,
3105                                  int rc, int fail_id)
3106 {
3107         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
3108                 DEBUG_REQ(D_ERROR, req, "dropping reply");
3109                 return -ECOMM;
3110         }
3111         /*
3112          * We can have a null rq_reqmsg in the event of bad signature or
3113          * no context when unwrapping
3114          */
3115         if (req->rq_reqmsg &&
3116             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
3117             OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
3118                 return -ECOMM;
3119
3120         if (unlikely(rc)) {
3121                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
3122                 req->rq_status = rc;
3123                 return ptlrpc_send_error(req, 1);
3124         }
3125         DEBUG_REQ(D_NET, req, "sending reply");
3126
3127         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
3128 }
3129
3130 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
3131 {
3132         struct ptlrpc_service_part *svcpt;
3133         int netrc;
3134         struct ptlrpc_reply_state *rs;
3135         struct obd_export *exp;
3136
3137         ENTRY;
3138
3139         if (req->rq_no_reply) {
3140                 EXIT;
3141                 return;
3142         }
3143
3144         svcpt = req->rq_rqbd->rqbd_svcpt;
3145         rs = req->rq_reply_state;
3146         if (rs == NULL || !rs->rs_difficult) {
3147                 /* no notifiers */
3148                 target_send_reply_msg(req, rc, fail_id);
3149                 EXIT;
3150                 return;
3151         }
3152
3153         /* must be an export if locks saved */
3154         LASSERT(req->rq_export != NULL);
3155         /* req/reply consistent */
3156         LASSERT(rs->rs_svcpt == svcpt);
3157
3158         /* "fresh" reply */
3159         LASSERT(!rs->rs_scheduled);
3160         LASSERT(!rs->rs_scheduled_ever);
3161         LASSERT(!rs->rs_handled);
3162         LASSERT(!rs->rs_on_net);
3163         LASSERT(rs->rs_export == NULL);
3164         LASSERT(list_empty(&rs->rs_obd_list));
3165         LASSERT(list_empty(&rs->rs_exp_list));
3166
3167         exp = class_export_get(req->rq_export);
3168
3169         /* disable reply scheduling while I'm setting up */
3170         rs->rs_scheduled = 1;
3171         rs->rs_on_net    = 1;
3172         rs->rs_xid       = req->rq_xid;
3173         rs->rs_transno   = req->rq_transno;
3174         rs->rs_export    = exp;
3175         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
3176
3177         spin_lock(&exp->exp_uncommitted_replies_lock);
3178         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
3179                rs->rs_transno, exp->exp_last_committed);
3180         if (rs->rs_transno > exp->exp_last_committed) {
3181                 /* not committed already */
3182                 list_add_tail(&rs->rs_obd_list,
3183                                   &exp->exp_uncommitted_replies);
3184         }
3185         spin_unlock(&exp->exp_uncommitted_replies_lock);
3186
3187         spin_lock(&exp->exp_lock);
3188         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
3189         spin_unlock(&exp->exp_lock);
3190
3191         netrc = target_send_reply_msg(req, rc, fail_id);
3192
3193         spin_lock(&svcpt->scp_rep_lock);
3194
3195         atomic_inc(&svcpt->scp_nreps_difficult);
3196
3197         if (netrc != 0) {
3198                 /*
3199                  * error sending: reply is off the net.  Also we need +1
3200                  * reply ref until ptlrpc_handle_rs() is done
3201                  * with the reply state (if the send was successful, there
3202                  * would have been +1 ref for the net, which
3203                  * reply_out_callback leaves alone)
3204                  */
3205                 rs->rs_on_net = 0;
3206                 ptlrpc_rs_addref(rs);
3207         }
3208
3209         spin_lock(&rs->rs_lock);
3210         if (rs->rs_transno <= exp->exp_last_committed ||
3211             (!rs->rs_on_net && !rs->rs_no_ack) ||
3212             list_empty(&rs->rs_exp_list) ||     /* completed already */
3213             list_empty(&rs->rs_obd_list)) {
3214                 CDEBUG(D_HA, "Schedule reply immediately\n");
3215                 ptlrpc_dispatch_difficult_reply(rs);
3216         } else {
3217                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
3218                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
3219         }
3220         spin_unlock(&rs->rs_lock);
3221         spin_unlock(&svcpt->scp_rep_lock);
3222         EXIT;
3223 }
3224
3225 enum ldlm_mode lck_compat_array[] = {
3226         [LCK_EX]    = LCK_COMPAT_EX,
3227         [LCK_PW]    = LCK_COMPAT_PW,
3228         [LCK_PR]    = LCK_COMPAT_PR,
3229         [LCK_CW]    = LCK_COMPAT_CW,
3230         [LCK_CR]    = LCK_COMPAT_CR,
3231         [LCK_NL]    = LCK_COMPAT_NL,
3232         [LCK_GROUP] = LCK_COMPAT_GROUP,
3233         [LCK_COS]   = LCK_COMPAT_COS,
3234 };
3235
3236 /**
3237  * Rather arbitrary mapping from LDLM error codes to errno values. This should
3238  * not escape to the user level.
3239  */
3240 int ldlm_error2errno(enum ldlm_error error)
3241 {
3242         int result;
3243
3244         switch (error) {
3245         case ELDLM_OK:
3246         case ELDLM_LOCK_MATCHED:
3247                 result = 0;
3248                 break;
3249         case ELDLM_LOCK_CHANGED:
3250                 result = -ESTALE;
3251                 break;
3252         case ELDLM_LOCK_ABORTED:
3253                 result = -ENAVAIL;
3254                 break;
3255         case ELDLM_LOCK_REPLACED:
3256                 result = -ESRCH;
3257                 break;
3258         case ELDLM_NO_LOCK_DATA:
3259                 result = -ENOENT;
3260                 break;
3261         case ELDLM_NAMESPACE_EXISTS:
3262                 result = -EEXIST;
3263                 break;
3264         case ELDLM_BAD_NAMESPACE:
3265                 result = -EBADF;
3266                 break;
3267         default:
3268                 if (((int)error) < 0) { /* cast to signed type */
3269                         result = error; /* as ldlm_error can be unsigned */
3270                 } else {
3271                         CERROR("Invalid DLM result code: %d\n", error);
3272                         result = -EPROTO;
3273                 }
3274         }
3275         return result;
3276 }
3277 EXPORT_SYMBOL(ldlm_error2errno);
3278
3279 /**
3280  * Dual to ldlm_error2errno(): maps errno values back to enum ldlm_error.
3281  */
3282 enum ldlm_error ldlm_errno2error(int err_no)
3283 {
3284         int error;
3285
3286         switch (err_no) {
3287         case 0:
3288                 error = ELDLM_OK;
3289                 break;
3290         case -ESTALE:
3291                 error = ELDLM_LOCK_CHANGED;
3292                 break;
3293         case -ENAVAIL:
3294                 error = ELDLM_LOCK_ABORTED;
3295                 break;
3296         case -ESRCH:
3297                 error = ELDLM_LOCK_REPLACED;
3298                 break;
3299         case -ENOENT:
3300                 error = ELDLM_NO_LOCK_DATA;
3301                 break;
3302         case -EEXIST:
3303                 error = ELDLM_NAMESPACE_EXISTS;
3304                 break;
3305         case -EBADF:
3306                 error = ELDLM_BAD_NAMESPACE;
3307                 break;
3308         default:
3309                 error = err_no;
3310         }
3311         return error;
3312 }
3313
3314 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3315 void ldlm_dump_export_locks(struct obd_export *exp)
3316 {
3317         spin_lock(&exp->exp_locks_list_guard);
3318         if (!list_empty(&exp->exp_locks_list)) {
3319                 struct ldlm_lock *lock;
3320
3321                 CERROR("dumping locks for export %p, ignore if the unmount doesn't hang\n",
3322                        exp);
3323                 list_for_each_entry(lock, &exp->exp_locks_list,
3324                                         l_exp_refs_link)
3325                         LDLM_ERROR(lock, "lock:");
3326         }
3327         spin_unlock(&exp->exp_locks_list_guard);
3328 }
3329 #endif
3330
3331 #ifdef HAVE_SERVER_SUPPORT
3332 static inline const char *bulk2type(struct ptlrpc_request *req)
3333 {
3334         if (req->rq_bulk_read)
3335                 return "READ";
3336         if (req->rq_bulk_write)
3337                 return "WRITE";
3338         return "UNKNOWN";
3339 }
3340
3341 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc)
3342 {
3343         struct ptlrpc_request *req = desc->bd_req;
3344         time64_t start = ktime_get_seconds();
3345         time64_t deadline;
3346         int rc = 0;
3347
3348         ENTRY;
3349
3350         /* If there is eviction in progress, wait for it to finish. */
3351         wait_event_idle(
3352                 exp->exp_obd->obd_evict_inprogress_waitq,
3353                 !atomic_read(&exp->exp_obd->obd_evict_inprogress));
3354
3355         /* Check if client was evicted or reconnected already. */
3356         if (exp->exp_failed ||
3357             exp->exp_conn_cnt > lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3358                 rc = -ENOTCONN;
3359         } else {
3360                 if (req->rq_bulk_read)
3361                         rc = sptlrpc_svc_wrap_bulk(req, desc);
3362
3363                 if (OCD_HAS_FLAG(&exp->exp_connect_data, BULK_MBITS))
3364                         req->rq_mbits = lustre_msg_get_mbits(req->rq_reqmsg);
3365                 else /* old version, bulk matchbits is rq_xid */
3366                         req->rq_mbits = req->rq_xid;
3367
3368                 if (rc == 0)
3369                         rc = ptlrpc_start_bulk_transfer(desc);
3370         }
3371
3372         if (rc < 0) {
3373                 DEBUG_REQ(D_ERROR, req, "bulk %s failed: rc = %d",
3374                           bulk2type(req), rc);
3375                 RETURN(rc);
3376         }
3377
3378         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
3379                 ptlrpc_abort_bulk(desc);
3380                 RETURN(0);
3381         }
3382
3383         /* limit actual bulk transfer to bulk_timeout seconds */
3384         deadline = start + bulk_timeout;
3385         if (deadline > req->rq_deadline)
3386                 deadline = req->rq_deadline;
3387
3388         do {
3389                 time64_t timeoutl = deadline - ktime_get_seconds();
3390                 time64_t rq_deadline;
3391
3392                 while (timeoutl >= 0 &&
3393                        wait_event_idle_timeout(
3394                                desc->bd_waitq,
3395                                !ptlrpc_server_bulk_active(desc) ||
3396                                exp->exp_failed ||
3397                                exp->exp_conn_cnt >
3398                                lustre_msg_get_conn_cnt(req->rq_reqmsg),
3399                                timeoutl ? cfs_time_seconds(1) : 1) == 0)
3400                         timeoutl -= 1;
3401                 rc = timeoutl < 0 ? -ETIMEDOUT : 0;
3402
3403                 /* Wait again if we changed rq_deadline. */
3404                 rq_deadline = READ_ONCE(req->rq_deadline);
3405                 deadline = start + bulk_timeout;
3406                 if (deadline > rq_deadline)
3407                         deadline = rq_deadline;
3408         } while (rc == -ETIMEDOUT &&
3409                  deadline > ktime_get_seconds());
3410
3411         if (rc == -ETIMEDOUT) {
3412                 DEBUG_REQ(D_ERROR, req, "timeout on bulk %s after %lld%+llds",
3413                           bulk2type(req), deadline - start,
3414                           ktime_get_real_seconds() - deadline);
3415                 ptlrpc_abort_bulk(desc);
3416         } else if (exp->exp_failed) {
3417                 DEBUG_REQ(D_ERROR, req, "Eviction on bulk %s",
3418                           bulk2type(req));
3419                 rc = -ENOTCONN;
3420                 ptlrpc_abort_bulk(desc);
3421         } else if (exp->exp_conn_cnt >
3422                    lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3423                 DEBUG_REQ(D_ERROR, req, "Reconnect on bulk %s",
3424                           bulk2type(req));
3425                 /* We don't reply anyway. */
3426                 rc = -ETIMEDOUT;
3427                 ptlrpc_abort_bulk(desc);
3428         } else if (desc->bd_failure) {
3429                 DEBUG_REQ(D_ERROR, req, "network error on bulk %s",
3430                           bulk2type(req));
3431                 /* XXX should this be a different errno? */
3432                 rc = -ETIMEDOUT;
3433         } else {
3434                 if (req->rq_bulk_write)
3435                         rc = sptlrpc_svc_unwrap_bulk(req, desc);
3436                 if (rc == 0 && desc->bd_nob_transferred != desc->bd_nob) {
3437                         DEBUG_REQ(D_ERROR, req, "truncated bulk %s %d(%d)",
3438                                   bulk2type(req), desc->bd_nob_transferred,
3439                                   desc->bd_nob);
3440                         /* XXX should this be a different errno? */
3441                         rc = -ETIMEDOUT;
3442                 }
3443         }
3444
3445         RETURN(rc);
3446 }
3447 EXPORT_SYMBOL(target_bulk_io);
3448
3449 #endif /* HAVE_SERVER_SUPPORT */