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, 2016, 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 <linux/kthread.h>
  43 #include <libcfs/libcfs.h>
  44 #include <obd.h>
  45 #include <obd_class.h>
  46 #include <lustre_dlm.h>
  47 #include <lustre_net.h>
  48 #include <lustre_sec.h>
  49 #include "ldlm_internal.h"
  50
  51 /* @priority: If non-zero, move the selected connection to the list head.
  52  * @create: If zero, only search in existing connections.
  53  */
  54 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  55                            int priority, int create)
  56 {
  57         struct ptlrpc_connection *ptlrpc_conn;
  58         struct obd_import_conn *imp_conn = NULL, *item;
  59         lnet_nid_t nid4refnet = LNET_NID_ANY;
  60         int rc = 0;
  61         ENTRY;
  62
  63         if (!create && !priority) {
  64                 CDEBUG(D_HA, "Nothing to do\n");
  65                 RETURN(-EINVAL);
  66         }
  67
  68         if (imp->imp_connection &&
  69             imp->imp_connection->c_remote_uuid.uuid[0] == 0)
  70                 /* nid4refnet is used to restrict network connections */
  71                 nid4refnet = imp->imp_connection->c_self;
  72         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, nid4refnet);
  73         if (!ptlrpc_conn) {
  74                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  75                 RETURN(-ENOENT);
  76         }
  77
  78         if (create) {
  79                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  80                 if (!imp_conn)
  81                         GOTO(out_put, rc = -ENOMEM);
  82         }
  83
  84         spin_lock(&imp->imp_lock);
  85         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  86                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  87                         if (priority) {
  88                                 list_del(&item->oic_item);
  89                                 list_add(&item->oic_item,
  90                                          &imp->imp_conn_list);
  91                                 item->oic_last_attempt = 0;
  92                         }
  93                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  94                                imp, imp->imp_obd->obd_name, uuid->uuid,
  95                                (priority ? ", moved to head" : ""));
  96                         spin_unlock(&imp->imp_lock);
  97                         GOTO(out_free, rc = 0);
  98                 }
  99         }
 100         /* No existing import connection found for \a uuid. */
 101         if (create) {
 102                 imp_conn->oic_conn = ptlrpc_conn;
 103                 imp_conn->oic_uuid = *uuid;
 104                 imp_conn->oic_last_attempt = 0;
 105                 if (priority)
 106                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 107                 else
 108                         list_add_tail(&imp_conn->oic_item,
 109                                       &imp->imp_conn_list);
 110                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 111                        imp, imp->imp_obd->obd_name, uuid->uuid,
 112                        (priority ? "head" : "tail"));
 113         } else {
 114                 spin_unlock(&imp->imp_lock);
 115                 GOTO(out_free, rc = -ENOENT);
 116         }
 117
 118         spin_unlock(&imp->imp_lock);
 119         RETURN(0);
 120 out_free:
 121         if (imp_conn)
 122                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 123 out_put:
 124         ptlrpc_connection_put(ptlrpc_conn);
 125         RETURN(rc);
 126 }
 127
 128 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 129 {
 130         return import_set_conn(imp, uuid, 1, 0);
 131 }
 132
 133 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 134                            int priority)
 135 {
 136         return import_set_conn(imp, uuid, priority, 1);
 137 }
 138 EXPORT_SYMBOL(client_import_add_conn);
 139
 140 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 141 {
 142         struct obd_import_conn *imp_conn;
 143         struct obd_export *dlmexp;
 144         int rc = -ENOENT;
 145         ENTRY;
 146
 147         spin_lock(&imp->imp_lock);
 148         if (list_empty(&imp->imp_conn_list)) {
 149                 LASSERT(!imp->imp_connection);
 150                 GOTO(out, rc);
 151         }
 152
 153         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 154                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 155                         continue;
 156                 LASSERT(imp_conn->oic_conn);
 157
 158                 if (imp_conn == imp->imp_conn_current) {
 159                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 160
 161                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 162                             imp->imp_state != LUSTRE_IMP_DISCON) {
 163                                 CERROR("can't remove current connection\n");
 164                                 GOTO(out, rc = -EBUSY);
 165                         }
 166
 167                         ptlrpc_connection_put(imp->imp_connection);
 168                         imp->imp_connection = NULL;
 169
 170                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 171                         if (dlmexp && dlmexp->exp_connection) {
 172                                 LASSERT(dlmexp->exp_connection ==
 173                                         imp_conn->oic_conn);
 174                                 ptlrpc_connection_put(dlmexp->exp_connection);
 175                                 dlmexp->exp_connection = NULL;
 176                         }
 177
 178                         if (dlmexp != NULL)
 179                                 class_export_put(dlmexp);
 180                 }
 181
 182                 list_del(&imp_conn->oic_item);
 183                 ptlrpc_connection_put(imp_conn->oic_conn);
 184                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 185                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 186                        imp, imp->imp_obd->obd_name, uuid->uuid);
 187                 rc = 0;
 188                 break;
 189         }
 190 out:
 191         spin_unlock(&imp->imp_lock);
 192         if (rc == -ENOENT)
 193                 CERROR("connection %s not found\n", uuid->uuid);
 194         RETURN(rc);
 195 }
 196 EXPORT_SYMBOL(client_import_del_conn);
 197
 198 /**
 199  * Find conn UUID by peer NID. \a peer is a server NID. This function is used
 200  * to find a conn uuid of \a imp which can reach \a peer.
 201  */
 202 int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
 203                             struct obd_uuid *uuid)
 204 {
 205         struct obd_import_conn *conn;
 206         int rc = -ENOENT;
 207         ENTRY;
 208
 209         spin_lock(&imp->imp_lock);
 210         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 211                 /* Check if conn UUID does have this peer NID. */
 212                 if (class_check_uuid(&conn->oic_uuid, peer)) {
 213                         *uuid = conn->oic_uuid;
 214                         rc = 0;
 215                         break;
 216                 }
 217         }
 218         spin_unlock(&imp->imp_lock);
 219         RETURN(rc);
 220 }
 221 EXPORT_SYMBOL(client_import_find_conn);
 222
 223 void client_destroy_import(struct obd_import *imp)
 224 {
 225         /* Drop security policy instance after all RPCs have finished/aborted
 226          * to let all busy contexts be released. */
 227         class_import_get(imp);
 228         class_destroy_import(imp);
 229         sptlrpc_import_sec_put(imp);
 230         class_import_put(imp);
 231 }
 232 EXPORT_SYMBOL(client_destroy_import);
 233
 234 /**
 235  * Check whether or not the OSC is on MDT.
 236  * In the config log,
 237  * osc on MDT
 238  *      setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
 239  * osc on client
 240  *      setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
 241  *
 242  **/
 243 static int osc_on_mdt(char *obdname)
 244 {
 245         char *ptr;
 246
 247         ptr = strrchr(obdname, '-');
 248         if (ptr == NULL)
 249                 return 0;
 250
 251         if (strncmp(ptr + 1, "MDT", 3) == 0)
 252                 return 1;
 253
 254         return 0;
 255 }
 256
 257 /* Configure an RPC client OBD device.
 258  *
 259  * lcfg parameters:
 260  * 1 - client UUID
 261  * 2 - server UUID
 262  * 3 - inactive-on-startup
 263  * 4 - restrictive net
 264  */
 265 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 266 {
 267         struct client_obd *cli = &obddev->u.cli;
 268         struct obd_import *imp;
 269         struct obd_uuid server_uuid;
 270         int rq_portal, rp_portal, connect_op;
 271         char *name = obddev->obd_type->typ_name;
 272         enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
 273         char *cli_name = lustre_cfg_buf(lcfg, 0);
 274         struct ptlrpc_connection fake_conn = { .c_self = 0,
 275                                                .c_remote_uuid.uuid[0] = 0 };
 276         int rc;
 277         ENTRY;
 278
 279         /* In a more perfect world, we would hang a ptlrpc_client off of
 280          * obd_type and just use the values from there. */
 281         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 282                 rq_portal = OST_REQUEST_PORTAL;
 283                 rp_portal = OSC_REPLY_PORTAL;
 284                 connect_op = OST_CONNECT;
 285                 cli->cl_sp_me = LUSTRE_SP_CLI;
 286                 cli->cl_sp_to = LUSTRE_SP_OST;
 287                 ns_type = LDLM_NS_TYPE_OSC;
 288         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
 289                    !strcmp(name, LUSTRE_LWP_NAME)) {
 290                 rq_portal = MDS_REQUEST_PORTAL;
 291                 rp_portal = MDC_REPLY_PORTAL;
 292                 connect_op = MDS_CONNECT;
 293                 if (is_lwp_on_ost(cli_name))
 294                         cli->cl_sp_me = LUSTRE_SP_OST;
 295                 else if (is_lwp_on_mdt(cli_name))
 296                         cli->cl_sp_me = LUSTRE_SP_MDT;
 297                 else
 298                         cli->cl_sp_me = LUSTRE_SP_CLI;
 299                 cli->cl_sp_to = LUSTRE_SP_MDT;
 300                 ns_type = LDLM_NS_TYPE_MDC;
 301         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
 302                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
 303                         /* OSP_on_MDT for other MDTs */
 304                         connect_op = MDS_CONNECT;
 305                         cli->cl_sp_to = LUSTRE_SP_MDT;
 306                         ns_type = LDLM_NS_TYPE_MDC;
 307                         rq_portal = OUT_PORTAL;
 308                 } else {
 309                         /* OSP on MDT for OST */
 310                         connect_op = OST_CONNECT;
 311                         cli->cl_sp_to = LUSTRE_SP_OST;
 312                         ns_type = LDLM_NS_TYPE_OSC;
 313                         rq_portal = OST_REQUEST_PORTAL;
 314                 }
 315                 rp_portal = OSC_REPLY_PORTAL;
 316                 cli->cl_sp_me = LUSTRE_SP_MDT;
 317         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 318                 rq_portal = MGS_REQUEST_PORTAL;
 319                 rp_portal = MGC_REPLY_PORTAL;
 320                 connect_op = MGS_CONNECT;
 321                 cli->cl_sp_me = LUSTRE_SP_MGC;
 322                 cli->cl_sp_to = LUSTRE_SP_MGS;
 323                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 324                 ns_type = LDLM_NS_TYPE_MGC;
 325         } else {
 326                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 327                        name);
 328                 RETURN(-EINVAL);
 329         }
 330
 331         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 332                 CERROR("requires a TARGET UUID\n");
 333                 RETURN(-EINVAL);
 334         }
 335
 336         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 337                 CERROR("client UUID must be less than 38 characters\n");
 338                 RETURN(-EINVAL);
 339         }
 340
 341         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 342                 CERROR("setup requires a SERVER UUID\n");
 343                 RETURN(-EINVAL);
 344         }
 345
 346         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 347                 CERROR("target UUID must be less than 38 characters\n");
 348                 RETURN(-EINVAL);
 349         }
 350
 351         init_rwsem(&cli->cl_sem);
 352         mutex_init(&cli->cl_mgc_mutex);
 353         cli->cl_conn_count = 0;
 354         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 355                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 356                      sizeof(server_uuid)));
 357
 358         cli->cl_dirty_pages = 0;
 359         cli->cl_avail_grant = 0;
 360         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
 361         /* cl_dirty_max_pages may be changed at connect time in
 362          * ptlrpc_connect_interpret(). */
 363         client_adjust_max_dirty(cli);
 364         INIT_LIST_HEAD(&cli->cl_cache_waiters);
 365         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 366         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 367         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 368         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 369         spin_lock_init(&cli->cl_loi_list_lock);
 370         atomic_set(&cli->cl_pending_w_pages, 0);
 371         atomic_set(&cli->cl_pending_r_pages, 0);
 372         cli->cl_r_in_flight = 0;
 373         cli->cl_w_in_flight = 0;
 374
 375         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 376         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 377         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 378         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 379         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 380         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 381
 382         /* lru for osc. */
 383         INIT_LIST_HEAD(&cli->cl_lru_osc);
 384         atomic_set(&cli->cl_lru_shrinkers, 0);
 385         atomic_long_set(&cli->cl_lru_busy, 0);
 386         atomic_long_set(&cli->cl_lru_in_list, 0);
 387         INIT_LIST_HEAD(&cli->cl_lru_list);
 388         spin_lock_init(&cli->cl_lru_list_lock);
 389         atomic_long_set(&cli->cl_unstable_count, 0);
 390         INIT_LIST_HEAD(&cli->cl_shrink_list);
 391
 392         init_waitqueue_head(&cli->cl_destroy_waitq);
 393         atomic_set(&cli->cl_destroy_in_flight, 0);
 394 #ifdef ENABLE_CHECKSUM
 395         /* Turn on checksumming by default. */
 396         cli->cl_checksum = 1;
 397         /*
 398          * The supported checksum types will be worked out at connect time
 399          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 400          * through procfs.
 401          */
 402         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 403 #endif
 404         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 405
 406         /* Set it to possible maximum size. It may be reduced by ocd_brw_size
 407          * from OFD after connecting. */
 408         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 409
 410         /* set cl_chunkbits default value to PAGE_SHIFT,
 411          * it will be updated at OSC connection time. */
 412         cli->cl_chunkbits = PAGE_SHIFT;
 413
 414         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 415                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 416         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
 417                 cli->cl_max_rpcs_in_flight = 2;
 418         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
 419                 cli->cl_max_rpcs_in_flight = 3;
 420         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
 421                 cli->cl_max_rpcs_in_flight = 4;
 422         } else {
 423                 if (osc_on_mdt(obddev->obd_name))
 424                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
 425                 else
 426                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 427         }
 428
 429         spin_lock_init(&cli->cl_mod_rpcs_lock);
 430         spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
 431         cli->cl_max_mod_rpcs_in_flight = 0;
 432         cli->cl_mod_rpcs_in_flight = 0;
 433         cli->cl_close_rpcs_in_flight = 0;
 434         init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
 435         cli->cl_mod_tag_bitmap = NULL;
 436
 437         if (connect_op == MDS_CONNECT) {
 438                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
 439                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
 440                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 441                 if (cli->cl_mod_tag_bitmap == NULL)
 442                         GOTO(err, rc = -ENOMEM);
 443         }
 444
 445         rc = ldlm_get_ref();
 446         if (rc) {
 447                 CERROR("ldlm_get_ref failed: %d\n", rc);
 448                 GOTO(err, rc);
 449         }
 450
 451         ptlrpc_init_client(rq_portal, rp_portal, name,
 452                            &obddev->obd_ldlm_client);
 453
 454         imp = class_new_import(obddev);
 455         if (imp == NULL)
 456                 GOTO(err_ldlm, rc = -ENOENT);
 457         imp->imp_client = &obddev->obd_ldlm_client;
 458         imp->imp_connect_op = connect_op;
 459         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 460                LUSTRE_CFG_BUFLEN(lcfg, 1));
 461         class_import_put(imp);
 462
 463         if (lustre_cfg_buf(lcfg, 4)) {
 464                 __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
 465
 466                 if (refnet == LNET_NIDNET(LNET_NID_ANY)) {
 467                         rc = -EINVAL;
 468                         CERROR("%s: bad mount option 'network=%s': rc = %d\n",
 469                                obddev->obd_name, lustre_cfg_string(lcfg, 4),
 470                                rc);
 471                         GOTO(err_import, rc);
 472                 }
 473                 fake_conn.c_self = LNET_MKNID(refnet, 0);
 474                 imp->imp_connection = &fake_conn;
 475         }
 476
 477         rc = client_import_add_conn(imp, &server_uuid, 1);
 478         if (rc) {
 479                 CERROR("can't add initial connection\n");
 480                 GOTO(err_import, rc);
 481         }
 482         imp->imp_connection = NULL;
 483
 484         cli->cl_import = imp;
 485         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
 486         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 487
 488         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 489                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 490                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 491                                name, obddev->obd_name,
 492                                cli->cl_target_uuid.uuid);
 493                         spin_lock(&imp->imp_lock);
 494                         imp->imp_deactive = 1;
 495                         spin_unlock(&imp->imp_lock);
 496                 }
 497         }
 498
 499         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 500                                                    LDLM_NAMESPACE_CLIENT,
 501                                                    LDLM_NAMESPACE_GREEDY,
 502                                                    ns_type);
 503         if (obddev->obd_namespace == NULL) {
 504                 CERROR("Unable to create client namespace - %s\n",
 505                        obddev->obd_name);
 506                 GOTO(err_import, rc = -ENOMEM);
 507         }
 508
 509         RETURN(rc);
 510
 511 err_import:
 512         class_destroy_import(imp);
 513 err_ldlm:
 514         ldlm_put_ref();
 515 err:
 516         if (cli->cl_mod_tag_bitmap != NULL)
 517                 OBD_FREE(cli->cl_mod_tag_bitmap,
 518                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 519         cli->cl_mod_tag_bitmap = NULL;
 520         RETURN(rc);
 521
 522 }
 523 EXPORT_SYMBOL(client_obd_setup);
 524
 525 int client_obd_cleanup(struct obd_device *obddev)
 526 {
 527         struct client_obd *cli = &obddev->u.cli;
 528         ENTRY;
 529
 530         ldlm_namespace_free_post(obddev->obd_namespace);
 531         obddev->obd_namespace = NULL;
 532
 533         obd_cleanup_client_import(obddev);
 534         LASSERT(obddev->u.cli.cl_import == NULL);
 535
 536         ldlm_put_ref();
 537
 538         if (cli->cl_mod_tag_bitmap != NULL)
 539                 OBD_FREE(cli->cl_mod_tag_bitmap,
 540                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 541         cli->cl_mod_tag_bitmap = NULL;
 542
 543         RETURN(0);
 544 }
 545 EXPORT_SYMBOL(client_obd_cleanup);
 546
 547 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 548 int client_connect_import(const struct lu_env *env,
 549                           struct obd_export **exp,
 550                           struct obd_device *obd, struct obd_uuid *cluuid,
 551                           struct obd_connect_data *data, void *localdata)
 552 {
 553         struct client_obd       *cli    = &obd->u.cli;
 554         struct obd_import       *imp    = cli->cl_import;
 555         struct obd_connect_data *ocd;
 556         struct lustre_handle    conn    = { 0 };
 557         int                     rc;
 558         ENTRY;
 559
 560         *exp = NULL;
 561         down_write(&cli->cl_sem);
 562         if (cli->cl_conn_count > 0)
 563                 GOTO(out_sem, rc = -EALREADY);
 564
 565         rc = class_connect(&conn, obd, cluuid);
 566         if (rc)
 567                 GOTO(out_sem, rc);
 568
 569         cli->cl_conn_count++;
 570         *exp = class_conn2export(&conn);
 571
 572         LASSERT(obd->obd_namespace);
 573
 574         imp->imp_dlm_handle = conn;
 575         rc = ptlrpc_init_import(imp);
 576         if (rc != 0)
 577                 GOTO(out_ldlm, rc);
 578
 579         ocd = &imp->imp_connect_data;
 580         if (data) {
 581                 *ocd = *data;
 582                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 583                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
 584         }
 585
 586         rc = ptlrpc_connect_import(imp);
 587         if (rc != 0) {
 588                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 589                 GOTO(out_ldlm, rc);
 590         }
 591         LASSERT(*exp != NULL && (*exp)->exp_connection);
 592
 593         if (data) {
 594                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 595                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 596                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 597                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 598         }
 599
 600         ptlrpc_pinger_add_import(imp);
 601
 602         EXIT;
 603
 604         if (rc) {
 605 out_ldlm:
 606                 cli->cl_conn_count--;
 607                 class_disconnect(*exp);
 608                 *exp = NULL;
 609         }
 610 out_sem:
 611         up_write(&cli->cl_sem);
 612
 613         return rc;
 614 }
 615 EXPORT_SYMBOL(client_connect_import);
 616
 617 int client_disconnect_export(struct obd_export *exp)
 618 {
 619         struct obd_device *obd = class_exp2obd(exp);
 620         struct client_obd *cli;
 621         struct obd_import *imp;
 622         int rc = 0, err;
 623         ENTRY;
 624
 625         if (!obd) {
 626                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 627                        exp, exp ? exp->exp_handle.h_cookie : -1);
 628                 RETURN(-EINVAL);
 629         }
 630
 631         cli = &obd->u.cli;
 632         imp = cli->cl_import;
 633
 634         down_write(&cli->cl_sem);
 635         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
 636                 cli->cl_conn_count);
 637
 638         if (cli->cl_conn_count == 0) {
 639                 CERROR("disconnecting disconnected device (%s)\n",
 640                        obd->obd_name);
 641                 GOTO(out_disconnect, rc = -EINVAL);
 642         }
 643
 644         cli->cl_conn_count--;
 645         if (cli->cl_conn_count != 0)
 646                 GOTO(out_disconnect, rc = 0);
 647
 648         /* Mark import deactivated now, so we don't try to reconnect if any
 649          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 650          * fully deactivate the import, or that would drop all requests. */
 651         spin_lock(&imp->imp_lock);
 652         imp->imp_deactive = 1;
 653         spin_unlock(&imp->imp_lock);
 654
 655         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 656          * delete it regardless.  (It's safe to delete an import that was
 657          * never added.) */
 658         (void)ptlrpc_pinger_del_import(imp);
 659
 660         if (obd->obd_namespace != NULL) {
 661                 /* obd_force == local only */
 662                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 663                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 664                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 665         }
 666
 667         /* There's no need to hold sem while disconnecting an import,
 668          * and it may actually cause deadlock in GSS. */
 669         up_write(&cli->cl_sem);
 670         rc = ptlrpc_disconnect_import(imp, 0);
 671         down_write(&cli->cl_sem);
 672
 673         ptlrpc_invalidate_import(imp);
 674
 675         EXIT;
 676
 677 out_disconnect:
 678         /* Use server style - class_disconnect should be always called for
 679          * o_disconnect. */
 680         err = class_disconnect(exp);
 681         if (!rc && err)
 682                 rc = err;
 683
 684         up_write(&cli->cl_sem);
 685
 686         RETURN(rc);
 687 }
 688 EXPORT_SYMBOL(client_disconnect_export);
 689
 690 #ifdef HAVE_SERVER_SUPPORT
 691 int server_disconnect_export(struct obd_export *exp)
 692 {
 693         int rc;
 694         ENTRY;
 695
 696         /* Disconnect early so that clients can't keep using export. */
 697         rc = class_disconnect(exp);
 698         /* Close import to avoid sending any requests. */
 699         if (exp->exp_imp_reverse)
 700                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 701
 702         ldlm_bl_thread_wakeup();
 703
 704         /* complete all outstanding replies */
 705         spin_lock(&exp->exp_lock);
 706         while (!list_empty(&exp->exp_outstanding_replies)) {
 707                 struct ptlrpc_reply_state *rs =
 708                         list_entry(exp->exp_outstanding_replies.next,
 709                                        struct ptlrpc_reply_state, rs_exp_list);
 710                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 711
 712                 spin_lock(&svcpt->scp_rep_lock);
 713
 714                 list_del_init(&rs->rs_exp_list);
 715                 spin_lock(&rs->rs_lock);
 716                 ptlrpc_schedule_difficult_reply(rs);
 717                 spin_unlock(&rs->rs_lock);
 718
 719                 spin_unlock(&svcpt->scp_rep_lock);
 720         }
 721         spin_unlock(&exp->exp_lock);
 722
 723         RETURN(rc);
 724 }
 725 EXPORT_SYMBOL(server_disconnect_export);
 726
 727 /* --------------------------------------------------------------------------
 728  * from old lib/target.c
 729  * -------------------------------------------------------------------------- */
 730
 731 static int target_handle_reconnect(struct lustre_handle *conn,
 732                                    struct obd_export *exp,
 733                                    struct obd_uuid *cluuid)
 734 {
 735         struct obd_device *target;
 736         struct lustre_handle *hdl;
 737         cfs_time_t now;
 738         cfs_time_t deadline;
 739         int timeout;
 740         int rc = 0;
 741         ENTRY;
 742
 743         hdl = &exp->exp_imp_reverse->imp_remote_handle;
 744         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
 745                 conn->cookie = exp->exp_handle.h_cookie;
 746                 CDEBUG(D_HA, "connect export for UUID '%s' at %p,"
 747                        " cookie %#llx\n", cluuid->uuid, exp, conn->cookie);
 748                 RETURN(0);
 749         }
 750
 751         target = exp->exp_obd;
 752
 753         /* Might be a re-connect after a partition. */
 754         if (memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 755                 LCONSOLE_WARN("%s: already connected client %s (at %s) "
 756                               "with handle %#llx. Rejecting client "
 757                               "with the same UUID trying to reconnect "
 758                               "with handle %#llx\n", target->obd_name,
 759                               obd_uuid2str(&exp->exp_client_uuid),
 760                               obd_export_nid2str(exp),
 761                               hdl->cookie, conn->cookie);
 762                 memset(conn, 0, sizeof *conn);
 763                 /* target_handle_connect() treats EALREADY and
 764                  * -EALREADY differently.  -EALREADY is an error
 765                  * (same UUID, different handle). */
 766                 RETURN(-EALREADY);
 767         }
 768
 769         if (!target->obd_recovering) {
 770                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
 771                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
 772                         obd_export_nid2str(exp));
 773                 GOTO(out_already, rc);
 774         }
 775
 776         now = cfs_time_current();
 777         deadline = target->obd_recovery_timer.expires;
 778         if (cfs_time_before(now, deadline)) {
 779                 struct target_distribute_txn_data *tdtd =
 780                                         class_exp2tgt(exp)->lut_tdtd;
 781                 int size = 0;
 782                 int count = 0;
 783                 char *buf = NULL;
 784
 785                 timeout = cfs_duration_sec(cfs_time_sub(deadline, now));
 786                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
 787                         buf = tdtd->tdtd_show_update_logs_retrievers(
 788                                 tdtd->tdtd_show_retrievers_cbdata,
 789                                 &size, &count);
 790
 791                 if (count > 0)
 792                         LCONSOLE_WARN("%s: Recovery already passed deadline "
 793                                       "%d:%.02d. It is due to DNE recovery "
 794                                       "failed/stuck on the %d MDT(s):%s. "
 795                                       "Please wait until all MDTs recovered "
 796                                       "or abort the recovery by force.\n",
 797                                       target->obd_name, timeout / 60,
 798                                       timeout % 60, count,
 799                                       buf ? buf : "unknown (not enough RAM)");
 800                 else
 801                         LCONSOLE_WARN("%s: Recovery already passed deadline "
 802                                       "%d:%.02d. If you do not want to wait "
 803                                       "more, please abort the recovery by "
 804                                       "force.\n", target->obd_name,
 805                                       timeout / 60, timeout % 60);
 806
 807                 if (buf != NULL)
 808                         OBD_FREE(buf, size);
 809         } else {
 810                 timeout = cfs_duration_sec(cfs_time_sub(now, deadline));
 811                 LCONSOLE_WARN("%s: Recovery already passed deadline"
 812                         " %d:%.02d, It is most likely due to DNE"
 813                         " recovery is failed or stuck, please wait a"
 814                         " few more minutes or abort the recovery.\n",
 815                         target->obd_name, timeout / 60, timeout % 60);
 816         }
 817
 818 out_already:
 819         conn->cookie = exp->exp_handle.h_cookie;
 820         /* target_handle_connect() treats EALREADY and
 821          * -EALREADY differently.  EALREADY means we are
 822          * doing a valid reconnect from the same client. */
 823         RETURN(EALREADY);
 824 }
 825
 826 static void
 827 check_and_start_recovery_timer(struct obd_device *obd,
 828                                struct ptlrpc_request *req, int new_client);
 829
 830 /**
 831  * update flags for import during reconnect process
 832  */
 833 static int rev_import_flags_update(struct obd_import *revimp,
 834                                    struct ptlrpc_request *req)
 835 {
 836         int rc;
 837         struct obd_connect_data *data;
 838
 839         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 840
 841         if (data->ocd_connect_flags & OBD_CONNECT_AT)
 842                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 843         else
 844                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 845
 846         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
 847
 848         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
 849         if (rc) {
 850                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
 851                         revimp->imp_client->cli_name,
 852                         libcfs_id2str(req->rq_peer), rc);
 853                 return rc;
 854         }
 855
 856         return 0;
 857 }
 858
 859 /**
 860  * Allocate a new reverse import for an export.
 861  *
 862  * \retval -errno in case error hit
 863  * \retval 0 if reverse import correctly init
 864  **/
 865 int rev_import_init(struct obd_export *export)
 866 {
 867         struct obd_device *obd = export->exp_obd;
 868         struct obd_import *revimp;
 869
 870         LASSERT(export->exp_imp_reverse == NULL);
 871
 872         revimp = class_new_import(obd);
 873         if (revimp == NULL)
 874                 return -ENOMEM;
 875
 876         revimp->imp_remote_handle.cookie = 0ULL;
 877         revimp->imp_client = &obd->obd_ldlm_client;
 878         revimp->imp_dlm_fake = 1;
 879
 880         /* it is safe to connect import in new state as no sends possible */
 881         spin_lock(&export->exp_lock);
 882         export->exp_imp_reverse = revimp;
 883         spin_unlock(&export->exp_lock);
 884         class_import_put(revimp);
 885
 886         return 0;
 887 }
 888 EXPORT_SYMBOL(rev_import_init);
 889
 890 /**
 891  * Handle reconnect for an export.
 892  *
 893  * \param exp export to handle reconnect process
 894  * \param req client reconnect request
 895  *
 896  * \retval -rc in case securitfy flavor can't be changed
 897  * \retval 0 in case none problems
 898  */
 899 static int rev_import_reconnect(struct obd_export *exp,
 900                                 struct ptlrpc_request *req)
 901 {
 902         struct obd_import *revimp = exp->exp_imp_reverse;
 903         struct lustre_handle *lh;
 904         int rc;
 905
 906         /* avoid sending a request until import flags are changed */
 907         ptlrpc_import_enter_resend(revimp);
 908
 909         if (revimp->imp_connection != NULL)
 910                 ptlrpc_connection_put(revimp->imp_connection);
 911
 912         /*
 913          * client from recovery don't have a handle so we need to take from
 914          * request. it may produce situation when wrong client connected
 915          * to recovery as we trust a client uuid
 916          */
 917         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 918         revimp->imp_remote_handle = *lh;
 919
 920         /* unknown versions will be caught in
 921          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
 922         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
 923
 924         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
 925
 926         rc = rev_import_flags_update(revimp, req);
 927         if (rc != 0) {
 928                 /* it is safe to still be in RECOVERY phase as we are not able
 929                  * to setup correct security flavor so requests are not able to
 930                  * be delivered correctly */
 931                 return rc;
 932         }
 933
 934         /* resend all rpc's via new connection */
 935         return ptlrpc_import_recovery_state_machine(revimp);
 936 }
 937
 938 int target_handle_connect(struct ptlrpc_request *req)
 939 {
 940         struct obd_device *target = NULL;
 941         struct obd_export *export = NULL;
 942         /* connect handle - filled from target_handle_reconnect in
 943          * reconnect case */
 944         struct lustre_handle conn;
 945         struct lustre_handle *tmp;
 946         struct obd_uuid tgtuuid;
 947         struct obd_uuid cluuid;
 948         char *str;
 949         int rc = 0;
 950         char *target_start;
 951         int target_len;
 952         bool     mds_conn = false, lw_client = false, initial_conn = false;
 953         bool     mds_mds_conn = false;
 954         bool     new_mds_mds_conn = false;
 955         bool     target_referenced = false;
 956         struct obd_connect_data *data, *tmpdata;
 957         int size, tmpsize;
 958         lnet_nid_t *client_nid = NULL;
 959         ENTRY;
 960
 961         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 962
 963         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 964         if (str == NULL) {
 965                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 966                 GOTO(out, rc = -EINVAL);
 967         }
 968
 969         obd_str2uuid(&tgtuuid, str);
 970         target = class_uuid2obd(&tgtuuid);
 971         if (!target)
 972                 target = class_name2obd(str);
 973
 974         if (!target) {
 975                 deuuidify(str, NULL, &target_start, &target_len);
 976                 LCONSOLE_ERROR_MSG(0x137, "%s: not available for connect "
 977                                    "from %s (no target). If you are running "
 978                                    "an HA pair check that the target is "
 979                                    "mounted on the other server.\n", str,
 980                                    libcfs_nid2str(req->rq_peer.nid));
 981                 GOTO(out, rc = -ENODEV);
 982         }
 983
 984         spin_lock(&target->obd_dev_lock);
 985         if (target->obd_stopping || !target->obd_set_up) {
 986                 spin_unlock(&target->obd_dev_lock);
 987
 988                 deuuidify(str, NULL, &target_start, &target_len);
 989                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
 990                               target_len, target_start,
 991                               libcfs_nid2str(req->rq_peer.nid),
 992                               (target->obd_stopping ?
 993                                "stopping" : "not set up"));
 994                 GOTO(out, rc = -ENODEV);
 995         }
 996
 997         if (target->obd_no_conn) {
 998                 spin_unlock(&target->obd_dev_lock);
 999
1000                 CDEBUG(D_INFO, "%s: Temporarily refusing client connection "
1001                                "from %s\n", target->obd_name,
1002                                libcfs_nid2str(req->rq_peer.nid));
1003                 GOTO(out, rc = -EAGAIN);
1004         }
1005
1006         /* Make sure the target isn't cleaned up while we're here. Yes,
1007          * there's still a race between the above check and our incref here.
1008          * Really, class_uuid2obd should take the ref. */
1009         class_incref(target, __func__, current);
1010         target_referenced = true;
1011
1012         target->obd_conn_inprogress++;
1013         spin_unlock(&target->obd_dev_lock);
1014
1015         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1016         if (str == NULL) {
1017                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1018                 GOTO(out, rc = -EINVAL);
1019         }
1020
1021         obd_str2uuid(&cluuid, str);
1022
1023         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1024         if (tmp == NULL)
1025                 GOTO(out, rc = -EPROTO);
1026
1027         conn = *tmp;
1028
1029         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1030                                     RCL_CLIENT);
1031         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1032         if (!data)
1033                 GOTO(out, rc = -EPROTO);
1034
1035         rc = req_capsule_server_pack(&req->rq_pill);
1036         if (rc)
1037                 GOTO(out, rc);
1038
1039 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1040         /* Don't allow clients to connect that are using old 1.8 format
1041          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1042          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1043          * FULL20 flag should be set on all connections since 2.0, but no
1044          * longer affects behaviour.
1045          *
1046          * Later this check will be disabled and the flag can be retired
1047          * completely once interop with 3.0 is no longer needed.
1048          */
1049         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1050                 GOTO(out, rc = -EPROTO);
1051 #endif
1052
1053         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1054                 if (data->ocd_version < LUSTRE_VERSION_CODE -
1055                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
1056                     data->ocd_version > LUSTRE_VERSION_CODE +
1057                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
1058                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
1059                                   "libclient connection attempt",
1060                                   data->ocd_version < LUSTRE_VERSION_CODE ?
1061                                   "old" : "new",
1062                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
1063                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
1064                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
1065                                   OBD_OCD_VERSION_FIX(data->ocd_version));
1066                         data = req_capsule_server_sized_get(&req->rq_pill,
1067                                                             &RMF_CONNECT_DATA,
1068                                     offsetof(typeof(*data), ocd_version) +
1069                                              sizeof(data->ocd_version));
1070                         if (data) {
1071                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
1072                                 data->ocd_version = LUSTRE_VERSION_CODE;
1073                         }
1074                         GOTO(out, rc = -EPROTO);
1075                 }
1076         }
1077
1078         /* Note: lw_client is needed in MDS-MDS failover during update log
1079          * processing, so we needs to allow lw_client to be connected at
1080          * anytime, instead of only the initial connection */
1081         lw_client = (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0;
1082
1083         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1084                 initial_conn = true;
1085                 mds_conn = (data->ocd_connect_flags & OBD_CONNECT_MDS) != 0;
1086                 mds_mds_conn = (data->ocd_connect_flags &
1087                                 OBD_CONNECT_MDS_MDS) != 0;
1088
1089                 /* OBD_CONNECT_MNE_SWAB is defined as OBD_CONNECT_MDS_MDS
1090                  * for Imperative Recovery connection from MGC to MGS.
1091                  *
1092                  * Via check OBD_CONNECT_FID, we can distinguish whether
1093                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1094                  * MGC or MDT. */
1095                 if (!lw_client &&
1096                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1097                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1098                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1099                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1100                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1101                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1102
1103                         /* We do not support the MDT-MDT interoperations with
1104                          * different version MDT because of protocol changes. */
1105                         if (unlikely(major != LUSTRE_MAJOR ||
1106                                      minor != LUSTRE_MINOR ||
1107                                      abs(patch - LUSTRE_PATCH) > 3)) {
1108                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the "
1109                                         "connection from different version MDT "
1110                                         "(%d.%d.%d.%d) %s %s\n",
1111                                         target->obd_name, LUSTRE_MAJOR,
1112                                         LUSTRE_MINOR, LUSTRE_PATCH, LUSTRE_FIX,
1113                                         major, minor, patch,
1114                                         OBD_OCD_VERSION_FIX(data->ocd_version),
1115                                         libcfs_nid2str(req->rq_peer.nid), str);
1116
1117                                 GOTO(out, rc = -EPROTO);
1118                         }
1119                 }
1120         }
1121
1122         /* lctl gets a backstage, all-access pass. */
1123         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1124                 goto dont_check_exports;
1125
1126         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
1127         if (!export)
1128                 goto no_export;
1129
1130         /* We've found an export in the hash. */
1131
1132         spin_lock(&export->exp_lock);
1133
1134         if (export->exp_connecting) { /* bug 9635, et. al. */
1135                 spin_unlock(&export->exp_lock);
1136                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1137                               export->exp_obd->obd_name, export,
1138                               libcfs_nid2str(req->rq_peer.nid));
1139                 class_export_put(export);
1140                 export = NULL;
1141                 rc = -EALREADY;
1142         } else if ((mds_conn || (lw_client && initial_conn) ||
1143                    data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1144                    export->exp_connection != NULL) {
1145                 spin_unlock(&export->exp_lock);
1146                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1147                         /* MDS or LWP reconnected after failover. */
1148                         LCONSOLE_WARN("%s: Received %s connection from "
1149                             "%s, removing former export from %s\n",
1150                             target->obd_name, mds_conn ? "MDS" : "LWP",
1151                             libcfs_nid2str(req->rq_peer.nid),
1152                             libcfs_nid2str(export->exp_connection->c_peer.nid));
1153                 } else {
1154                         /* New MDS connection from the same NID. */
1155                         LCONSOLE_WARN("%s: Received new %s connection from "
1156                                 "%s, removing former export from same NID\n",
1157                                 target->obd_name, mds_conn ? "MDS" : "LWP",
1158                                 libcfs_nid2str(req->rq_peer.nid));
1159                 }
1160
1161                 if (req->rq_peer.nid == export->exp_connection->c_peer.nid &&
1162                     data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
1163                         /* Because exports between MDTs will always be
1164                          * kept, let's do not fail such export if they
1165                          * come from the same NID, otherwise it might
1166                          * cause eviction between MDTs, which might
1167                          * cause namespace inconsistency */
1168                         spin_lock(&export->exp_lock);
1169                         export->exp_connecting = 1;
1170                         spin_unlock(&export->exp_lock);
1171                         conn.cookie = export->exp_handle.h_cookie;
1172                         rc = EALREADY;
1173                 } else {
1174                         class_fail_export(export);
1175                         class_export_put(export);
1176                         export = NULL;
1177                         rc = 0;
1178                 }
1179         } else if (export->exp_connection != NULL && initial_conn &&
1180                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1181                 spin_unlock(&export->exp_lock);
1182                 /* In MDS failover we have static UUID but NID can change. */
1183                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when "
1184                               "existing nid %s is already connected\n",
1185                               target->obd_name, cluuid.uuid,
1186                               libcfs_nid2str(req->rq_peer.nid),
1187                               libcfs_nid2str(
1188                                       export->exp_connection->c_peer.nid));
1189                 rc = -EALREADY;
1190                 class_export_put(export);
1191                 export = NULL;
1192         } else {
1193                 export->exp_connecting = 1;
1194                 spin_unlock(&export->exp_lock);
1195                 LASSERT(export->exp_obd == target);
1196
1197                 rc = target_handle_reconnect(&conn, export, &cluuid);
1198         }
1199
1200         /* If we found an export, we already unlocked. */
1201         if (!export) {
1202 no_export:
1203                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1204         } else if (req->rq_export == NULL &&
1205                    atomic_read(&export->exp_rpc_count) > 0) {
1206                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, "
1207                               "still busy with %d references\n",
1208                               target->obd_name, cluuid.uuid,
1209                               libcfs_nid2str(req->rq_peer.nid),
1210                               atomic_read(&export->exp_refcount));
1211                 GOTO(out, rc = -EBUSY);
1212         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
1213                 if (!strstr(cluuid.uuid, "mdt"))
1214                         LCONSOLE_WARN("%s: Rejecting reconnect from the "
1215                                       "known client %s (at %s) because it "
1216                                       "is indicating it is a new client",
1217                                       target->obd_name, cluuid.uuid,
1218                                       libcfs_nid2str(req->rq_peer.nid));
1219                 GOTO(out, rc = -EALREADY);
1220         } else {
1221                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1222         }
1223
1224         if (rc < 0) {
1225                 GOTO(out, rc);
1226         }
1227
1228         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %ld last %ld\n",
1229                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1230               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1231               export, (long)cfs_time_current_sec(),
1232               export ? (long)export->exp_last_request_time : 0);
1233
1234         /* If this is the first time a client connects, reset the recovery
1235          * timer. Discard lightweight connections which might be local. */
1236         if (!lw_client && rc == 0 && target->obd_recovering)
1237                 check_and_start_recovery_timer(target, req, export == NULL);
1238
1239         /* We want to handle EALREADY but *not* -EALREADY from
1240          * target_handle_reconnect(), return reconnection state in a flag. */
1241         if (rc == EALREADY) {
1242                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1243                 rc = 0;
1244         } else {
1245                 LASSERT(rc == 0);
1246         }
1247
1248         /* Tell the client if we support replayable requests. */
1249         if (target->obd_replayable)
1250                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1251         client_nid = &req->rq_peer.nid;
1252
1253         if (export == NULL) {
1254                 /* allow lightweight connections during recovery */
1255                 /* allow "new" MDT to be connected during recovery, since we
1256                  * need retrieve recovery update records from it */
1257                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1258                         cfs_time_t t;
1259                         int     c; /* connected */
1260                         int     i; /* in progress */
1261                         int     k; /* known */
1262                         int     s; /* stale/evicted */
1263
1264                         c = atomic_read(&target->obd_connected_clients);
1265                         i = atomic_read(&target->obd_lock_replay_clients);
1266                         k = target->obd_max_recoverable_clients;
1267                         s = target->obd_stale_clients;
1268                         t = target->obd_recovery_timer.expires;
1269                         t = cfs_time_sub(t, cfs_time_current());
1270                         t = cfs_duration_sec(t);
1271                         LCONSOLE_WARN("%s: Denying connection for new client %s"
1272                                       "(at %s), waiting for %d known clients "
1273                                       "(%d recovered, %d in progress, and %d "
1274                                       "evicted) to recover in %d:%.02d\n",
1275                                       target->obd_name, cluuid.uuid,
1276                                       libcfs_nid2str(req->rq_peer.nid), k,
1277                                       c - i, i, s, (int)t / 60,
1278                                       (int)t % 60);
1279                         rc = -EBUSY;
1280                 } else {
1281 dont_check_exports:
1282                         rc = obd_connect(req->rq_svc_thread->t_env,
1283                                          &export, target, &cluuid, data,
1284                                          client_nid);
1285                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1286                                 lustre_msg_add_op_flags(req->rq_repmsg,
1287                                                         MSG_CONNECT_RECOVERING);
1288                         if (rc == 0) {
1289                                 conn.cookie = export->exp_handle.h_cookie;
1290                                 rc = rev_import_init(export);
1291                         }
1292
1293                         if (mds_mds_conn)
1294                                 new_mds_mds_conn = true;
1295                 }
1296         } else {
1297                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1298                                    export, target, &cluuid, data, client_nid);
1299         }
1300         if (rc)
1301                 GOTO(out, rc);
1302
1303         LASSERT(target->u.obt.obt_magic == OBT_MAGIC);
1304         data->ocd_instance = target->u.obt.obt_instance;
1305
1306         /* Return only the parts of obd_connect_data that we understand, so the
1307          * client knows that we don't understand the rest. */
1308         if (data) {
1309                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1310                                                RCL_SERVER);
1311                 tmpdata = req_capsule_server_get(&req->rq_pill,
1312                                                  &RMF_CONNECT_DATA);
1313                 /* Don't use struct assignment here, because the client reply
1314                  * buffer may be smaller/larger than the local struct
1315                  * obd_connect_data. */
1316                 memcpy(tmpdata, data, min(tmpsize, size));
1317         }
1318
1319         /* If the client and the server are the same node, we will already
1320          * have an export that really points to the client's DLM export,
1321          * because we have a shared handles table.
1322          *
1323          * XXX this will go away when shaver stops sending the "connect" handle
1324          * in the real "remote handle" field of the request --phik 24 Apr 2003
1325          */
1326         ptlrpc_request_change_export(req, export);
1327
1328         spin_lock(&export->exp_lock);
1329         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1330                 spin_unlock(&export->exp_lock);
1331                 CDEBUG(D_RPCTRACE, "%s: %s already connected at greater "
1332                        "or equal conn_cnt: %d >= %d\n",
1333                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1334                        export->exp_conn_cnt,
1335                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1336
1337                 GOTO(out, rc = -EALREADY);
1338         }
1339         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1340         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1341
1342         /* Don't evict liblustre clients for not pinging. */
1343         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1344                 export->exp_libclient = 1;
1345                 spin_unlock(&export->exp_lock);
1346
1347                 spin_lock(&target->obd_dev_lock);
1348                 list_del_init(&export->exp_obd_chain_timed);
1349                 spin_unlock(&target->obd_dev_lock);
1350         } else {
1351                 spin_unlock(&export->exp_lock);
1352         }
1353
1354         if (export->exp_connection != NULL) {
1355                 /* Check to see if connection came from another NID. */
1356                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
1357                     !hlist_unhashed(&export->exp_nid_hash))
1358                         cfs_hash_del(export->exp_obd->obd_nid_hash,
1359                                      &export->exp_connection->c_peer.nid,
1360                                      &export->exp_nid_hash);
1361
1362                 ptlrpc_connection_put(export->exp_connection);
1363         }
1364
1365         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
1366                                                        req->rq_self,
1367                                                        &cluuid);
1368         if (hlist_unhashed(&export->exp_nid_hash))
1369                 cfs_hash_add(export->exp_obd->obd_nid_hash,
1370                              &export->exp_connection->c_peer.nid,
1371                              &export->exp_nid_hash);
1372
1373         lustre_msg_set_handle(req->rq_repmsg, &conn);
1374
1375         rc = rev_import_reconnect(export, req);
1376         if (rc != 0)
1377                 GOTO(out, rc);
1378
1379         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1380                 int has_transno;
1381                 __u64 transno = data->ocd_transno;
1382
1383                 spin_lock(&export->exp_lock);
1384                 /* possible race with class_disconnect_stale_exports,
1385                  * export may be already in the eviction process */
1386                 if (export->exp_failed) {
1387                         spin_unlock(&export->exp_lock);
1388                         GOTO(out, rc = -ENODEV);
1389                 }
1390                 export->exp_in_recovery = 1;
1391                 export->exp_req_replay_needed = 1;
1392                 export->exp_lock_replay_needed = 1;
1393                 spin_unlock(&export->exp_lock);
1394
1395                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1396                                  MSG_CONNECT_TRANSNO);
1397                 if (has_transno && transno == 0)
1398                         CWARN("Connect with zero transno!\n");
1399
1400                 if (has_transno && transno > 0 &&
1401                     transno < target->obd_next_recovery_transno &&
1402                     transno > target->obd_last_committed) {
1403                         /* Another way is to use cmpxchg() to be lock-free. */
1404                         spin_lock(&target->obd_recovery_task_lock);
1405                         if (transno < target->obd_next_recovery_transno)
1406                                 target->obd_next_recovery_transno = transno;
1407                         spin_unlock(&target->obd_recovery_task_lock);
1408                 }
1409
1410                 atomic_inc(&target->obd_req_replay_clients);
1411                 atomic_inc(&target->obd_lock_replay_clients);
1412                 /* Note: MDS-MDS connection is allowed to be connected during
1413                  * recovery, no matter if the exports needs to be recoveried.
1414                  * Because we need retrieve updates logs from all other MDTs.
1415                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1416                  * also needs to be increased to match other recovery checking
1417                  * condition. */
1418                 if (new_mds_mds_conn)
1419                         target->obd_max_recoverable_clients++;
1420                 if (atomic_inc_return(&target->obd_connected_clients) ==
1421                     target->obd_max_recoverable_clients)
1422                         wake_up(&target->obd_next_transno_waitq);
1423         }
1424
1425         /* Tell the client we're in recovery, when client is involved in it. */
1426         if (target->obd_recovering && !lw_client)
1427                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1428
1429 out:
1430         if (export) {
1431                 spin_lock(&export->exp_lock);
1432                 export->exp_connecting = 0;
1433                 spin_unlock(&export->exp_lock);
1434
1435                 class_export_put(export);
1436         }
1437         if (target_referenced == true && target != NULL) {
1438                 spin_lock(&target->obd_dev_lock);
1439                 target->obd_conn_inprogress--;
1440                 spin_unlock(&target->obd_dev_lock);
1441
1442                 class_decref(target, __func__, current);
1443         }
1444         req->rq_status = rc;
1445         RETURN(rc);
1446 }
1447
1448 int target_handle_disconnect(struct ptlrpc_request *req)
1449 {
1450         int rc;
1451         ENTRY;
1452
1453         rc = req_capsule_server_pack(&req->rq_pill);
1454         if (rc)
1455                 RETURN(rc);
1456
1457         /* Keep the rq_export around so we can send the reply. */
1458         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1459
1460         RETURN(0);
1461 }
1462
1463 void target_destroy_export(struct obd_export *exp)
1464 {
1465         struct obd_import       *imp = NULL;
1466         /* exports created from last_rcvd data, and "fake"
1467            exports created by lctl don't have an import */
1468         spin_lock(&exp->exp_lock);
1469         if (exp->exp_imp_reverse != NULL) {
1470                 imp = exp->exp_imp_reverse;
1471                 exp->exp_imp_reverse = NULL;
1472         }
1473         spin_unlock(&exp->exp_lock);
1474         if (imp != NULL)
1475                 client_destroy_import(imp);
1476
1477         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1478         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1479         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1480         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1481 }
1482 EXPORT_SYMBOL(target_destroy_export);
1483
1484 /*
1485  * Recovery functions
1486  */
1487 static void target_request_copy_get(struct ptlrpc_request *req)
1488 {
1489         class_export_rpc_inc(req->rq_export);
1490         LASSERT(list_empty(&req->rq_list));
1491         INIT_LIST_HEAD(&req->rq_replay_list);
1492
1493         /* Increase refcount to keep request in queue. */
1494         atomic_inc(&req->rq_refcount);
1495         /* Let export know it has replays to be handled. */
1496         atomic_inc(&req->rq_export->exp_replay_count);
1497 }
1498
1499 static void target_request_copy_put(struct ptlrpc_request *req)
1500 {
1501         LASSERT(list_empty(&req->rq_replay_list));
1502         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1503
1504         atomic_dec(&req->rq_export->exp_replay_count);
1505         class_export_rpc_dec(req->rq_export);
1506         ptlrpc_server_drop_request(req);
1507 }
1508
1509 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1510 {
1511         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1512         struct obd_export     *exp = req->rq_export;
1513         struct ptlrpc_request *reqiter;
1514         struct ptlrpc_request *dup_req = NULL;
1515         int                    dup = 0;
1516
1517         LASSERT(exp);
1518
1519         spin_lock(&exp->exp_lock);
1520         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1521                                 rq_replay_list) {
1522                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1523                         dup_req = reqiter;
1524                         dup = 1;
1525                         break;
1526                 }
1527         }
1528
1529         if (dup) {
1530                 /* We expect it with RESENT and REPLAY flags. */
1531                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1532                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1533                         CERROR("invalid flags %x of resent replay\n",
1534                                lustre_msg_get_flags(req->rq_reqmsg));
1535
1536                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1537                         __u32 new_conn;
1538
1539                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1540                         if (new_conn >
1541                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1542                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1543                                                         new_conn);
1544                 }
1545         } else {
1546                 list_add_tail(&req->rq_replay_list,
1547                                   &exp->exp_req_replay_queue);
1548         }
1549
1550         spin_unlock(&exp->exp_lock);
1551         return dup;
1552 }
1553
1554 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1555 {
1556         LASSERT(!list_empty(&req->rq_replay_list));
1557         LASSERT(req->rq_export);
1558
1559         spin_lock(&req->rq_export->exp_lock);
1560         list_del_init(&req->rq_replay_list);
1561         spin_unlock(&req->rq_export->exp_lock);
1562 }
1563
1564 static void target_finish_recovery(struct lu_target *lut)
1565 {
1566         struct obd_device *obd = lut->lut_obd;
1567         ENTRY;
1568
1569         /* Only log a recovery message when recovery has occurred. */
1570         if (obd->obd_recovery_start) {
1571                 time64_t now = ktime_get_real_seconds();
1572                 time64_t elapsed_time;
1573
1574                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start, 1);
1575                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients "
1576                         "%d recovered and %d %s evicted.\n", obd->obd_name,
1577                         (s64)elapsed_time / 60, (s64)elapsed_time % 60,
1578                         obd->obd_max_recoverable_clients,
1579                         atomic_read(&obd->obd_connected_clients),
1580                         obd->obd_stale_clients,
1581                         obd->obd_stale_clients == 1 ? "was" : "were");
1582         }
1583
1584         ldlm_reprocess_recovery_done(obd->obd_namespace);
1585         spin_lock(&obd->obd_recovery_task_lock);
1586         if (!list_empty(&obd->obd_req_replay_queue) ||
1587             !list_empty(&obd->obd_lock_replay_queue) ||
1588             !list_empty(&obd->obd_final_req_queue)) {
1589                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1590                        obd->obd_name,
1591                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1592                        list_empty(&obd->obd_lock_replay_queue) ? \
1593                                "" : "lock ",
1594                        list_empty(&obd->obd_final_req_queue) ? \
1595                                "" : "final ");
1596                 spin_unlock(&obd->obd_recovery_task_lock);
1597                 LBUG();
1598         }
1599         spin_unlock(&obd->obd_recovery_task_lock);
1600
1601         obd->obd_recovery_end = ktime_get_real_seconds();
1602
1603         /* When recovery finished, cleanup orphans on MDS and OST. */
1604         if (OBT(obd) && OBP(obd, postrecov)) {
1605                 int rc = OBP(obd, postrecov)(obd);
1606                 if (rc < 0)
1607                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1608                                       obd->obd_name, rc);
1609         }
1610         EXIT;
1611 }
1612
1613 static void abort_req_replay_queue(struct obd_device *obd)
1614 {
1615         struct ptlrpc_request *req, *n;
1616         struct list_head abort_list;
1617
1618         INIT_LIST_HEAD(&abort_list);
1619         spin_lock(&obd->obd_recovery_task_lock);
1620         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1621         spin_unlock(&obd->obd_recovery_task_lock);
1622         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1623                 DEBUG_REQ(D_WARNING, req, "aborted:");
1624                 req->rq_status = -ENOTCONN;
1625                 if (ptlrpc_error(req)) {
1626                         DEBUG_REQ(D_ERROR, req,
1627                                   "failed abort_req_reply; skipping");
1628                 }
1629                 target_exp_dequeue_req_replay(req);
1630                 target_request_copy_put(req);
1631         }
1632 }
1633
1634 static void abort_lock_replay_queue(struct obd_device *obd)
1635 {
1636         struct ptlrpc_request *req, *n;
1637         struct list_head abort_list;
1638
1639         INIT_LIST_HEAD(&abort_list);
1640         spin_lock(&obd->obd_recovery_task_lock);
1641         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1642         spin_unlock(&obd->obd_recovery_task_lock);
1643         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1644                 DEBUG_REQ(D_ERROR, req, "aborted:");
1645                 req->rq_status = -ENOTCONN;
1646                 if (ptlrpc_error(req)) {
1647                         DEBUG_REQ(D_ERROR, req,
1648                                   "failed abort_lock_reply; skipping");
1649                 }
1650                 target_request_copy_put(req);
1651         }
1652 }
1653
1654 /* Called from a cleanup function if the device is being cleaned up
1655    forcefully.  The exports should all have been disconnected already,
1656    the only thing left to do is
1657      - clear the recovery flags
1658      - cancel the timer
1659      - free queued requests and replies, but don't send replies
1660    Because the obd_stopping flag is set, no new requests should be received.
1661
1662 */
1663 void target_cleanup_recovery(struct obd_device *obd)
1664 {
1665         struct ptlrpc_request *req, *n;
1666         struct list_head clean_list;
1667
1668         INIT_LIST_HEAD(&clean_list);
1669         spin_lock(&obd->obd_dev_lock);
1670         if (!obd->obd_recovering) {
1671                 spin_unlock(&obd->obd_dev_lock);
1672                 EXIT;
1673                 return;
1674         }
1675         obd->obd_recovering = obd->obd_abort_recovery = 0;
1676         spin_unlock(&obd->obd_dev_lock);
1677
1678         spin_lock(&obd->obd_recovery_task_lock);
1679         target_cancel_recovery_timer(obd);
1680         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1681         spin_unlock(&obd->obd_recovery_task_lock);
1682
1683         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1684                 LASSERT(req->rq_reply_state == NULL);
1685                 target_exp_dequeue_req_replay(req);
1686                 target_request_copy_put(req);
1687         }
1688
1689         spin_lock(&obd->obd_recovery_task_lock);
1690         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1691         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1692         spin_unlock(&obd->obd_recovery_task_lock);
1693
1694         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1695                 LASSERT(req->rq_reply_state == NULL);
1696                 target_request_copy_put(req);
1697         }
1698
1699         EXIT;
1700 }
1701 EXPORT_SYMBOL(target_cleanup_recovery);
1702
1703 /* obd_recovery_task_lock should be held */
1704 void target_cancel_recovery_timer(struct obd_device *obd)
1705 {
1706         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1707         del_timer(&obd->obd_recovery_timer);
1708 }
1709
1710 static void target_start_recovery_timer(struct obd_device *obd)
1711 {
1712         if (obd->obd_recovery_start != 0)
1713                 return;
1714
1715         spin_lock(&obd->obd_dev_lock);
1716         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1717                 spin_unlock(&obd->obd_dev_lock);
1718                 return;
1719         }
1720
1721         LASSERT(obd->obd_recovery_timeout != 0);
1722
1723         if (obd->obd_recovery_start != 0) {
1724                 spin_unlock(&obd->obd_dev_lock);
1725                 return;
1726         }
1727
1728         mod_timer(&obd->obd_recovery_timer,
1729                   cfs_time_shift(obd->obd_recovery_timeout));
1730         obd->obd_recovery_start = ktime_get_real_seconds();
1731         spin_unlock(&obd->obd_dev_lock);
1732
1733         LCONSOLE_WARN("%s: Will be in recovery for at least %llu:%02llu, or until %d client%s reconnect%s\n",
1734                       obd->obd_name,
1735                       obd->obd_recovery_timeout / 60,
1736                       obd->obd_recovery_timeout % 60,
1737                       obd->obd_max_recoverable_clients,
1738                       (obd->obd_max_recoverable_clients == 1) ? "" : "s",
1739                       (obd->obd_max_recoverable_clients == 1) ? "s": "");
1740 }
1741
1742 /**
1743  * extend recovery window.
1744  *
1745  * if @extend is true, extend recovery window to have @drt remaining at least;
1746  * otherwise, make sure the recovery timeout value is not less than @drt.
1747  */
1748 static void extend_recovery_timer(struct obd_device *obd, int drt,
1749                                   bool extend)
1750 {
1751         time64_t now;
1752         time64_t end;
1753         time64_t left;
1754         time64_t to;
1755
1756         spin_lock(&obd->obd_dev_lock);
1757         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1758                 spin_unlock(&obd->obd_dev_lock);
1759                 return;
1760         }
1761         LASSERT(obd->obd_recovery_start != 0);
1762
1763         now = ktime_get_real_seconds();
1764         to = obd->obd_recovery_timeout;
1765         end = obd->obd_recovery_start + to;
1766         left = end - now;
1767
1768         if (extend && (drt > left)) {
1769                 to += drt - left;
1770         } else if (!extend && (drt > to)) {
1771                 to = drt;
1772         }
1773
1774         if (to > obd->obd_recovery_time_hard) {
1775                 to = obd->obd_recovery_time_hard;
1776                 CWARN("%s: extended recovery timer reaching hard limit: %lld, extend: %d\n",
1777                       obd->obd_name, to, extend);
1778         }
1779
1780         if (obd->obd_recovery_timeout < to) {
1781                 obd->obd_recovery_timeout = to;
1782                 end = obd->obd_recovery_start + to;
1783                 mod_timer(&obd->obd_recovery_timer,
1784                           cfs_time_shift(end - now));
1785         }
1786         spin_unlock(&obd->obd_dev_lock);
1787
1788         CDEBUG(D_HA, "%s: recovery timer will expire in %lld seconds\n",
1789                 obd->obd_name, (s64)(end - now));
1790 }
1791
1792 /* Reset the timer with each new client connection */
1793 /*
1794  * This timer is actually reconnect_timer, which is for making sure
1795  * the total recovery window is at least as big as my reconnect
1796  * attempt timing. So the initial recovery time_out will be set to
1797  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1798  * from client is bigger than this, then the recovery time_out will
1799  * be extended to make sure the client could be reconnected, in the
1800  * process, the timeout from the new client should be ignored.
1801  */
1802
1803 static void
1804 check_and_start_recovery_timer(struct obd_device *obd,
1805                                struct ptlrpc_request *req,
1806                                int new_client)
1807 {
1808         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1809         struct obd_device_target *obt = &obd->u.obt;
1810
1811         if (!new_client && service_time)
1812                 /* Teach server about old server's estimates, as first guess
1813                  * at how long new requests will take. */
1814                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
1815                             service_time);
1816
1817         target_start_recovery_timer(obd);
1818
1819         /* Convert the service time to RPC timeout,
1820          * and reuse service_time to limit stack usage. */
1821         service_time = at_est2timeout(service_time);
1822
1823         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
1824             service_time < at_extra)
1825                 service_time = at_extra;
1826
1827         /* We expect other clients to timeout within service_time, then try
1828          * to reconnect, then try the failover server.  The max delay between
1829          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL. */
1830         service_time += 2 * INITIAL_CONNECT_TIMEOUT;
1831
1832         LASSERT(obt->obt_magic == OBT_MAGIC);
1833         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
1834         if (service_time > obd->obd_recovery_timeout && !new_client)
1835                 extend_recovery_timer(obd, service_time, false);
1836 }
1837
1838 /** Health checking routines */
1839 static inline int exp_connect_healthy(struct obd_export *exp)
1840 {
1841         return (exp->exp_in_recovery);
1842 }
1843
1844 /** if export done req_replay or has replay in queue */
1845 static inline int exp_req_replay_healthy(struct obd_export *exp)
1846 {
1847         return (!exp->exp_req_replay_needed ||
1848                 atomic_read(&exp->exp_replay_count) > 0);
1849 }
1850
1851
1852 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
1853 {
1854         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1855                exp_req_replay_healthy(exp);
1856 }
1857
1858 /** if export done lock_replay or has replay in queue */
1859 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1860 {
1861         return (!exp->exp_lock_replay_needed ||
1862                 atomic_read(&exp->exp_replay_count) > 0);
1863 }
1864
1865 static inline int exp_vbr_healthy(struct obd_export *exp)
1866 {
1867         return (!exp->exp_vbr_failed);
1868 }
1869
1870 static inline int exp_finished(struct obd_export *exp)
1871 {
1872         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1873 }
1874
1875 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
1876 {
1877         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1878                 exp_finished(exp);
1879 }
1880
1881 static int check_for_next_transno(struct lu_target *lut)
1882 {
1883         struct ptlrpc_request *req = NULL;
1884         struct obd_device *obd = lut->lut_obd;
1885         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
1886         int wake_up = 0, connected, completed, queue_len;
1887         __u64 req_transno = 0;
1888         __u64 update_transno = 0;
1889         __u64 next_transno = 0;
1890         ENTRY;
1891
1892         spin_lock(&obd->obd_recovery_task_lock);
1893         if (!list_empty(&obd->obd_req_replay_queue)) {
1894                 req = list_entry(obd->obd_req_replay_queue.next,
1895                                      struct ptlrpc_request, rq_list);
1896                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1897         }
1898
1899         if (tdtd != NULL)
1900                 update_transno = distribute_txn_get_next_transno(tdtd);
1901
1902         connected = atomic_read(&obd->obd_connected_clients);
1903         completed = connected - atomic_read(&obd->obd_req_replay_clients);
1904         queue_len = obd->obd_requests_queued_for_recovery;
1905         next_transno = obd->obd_next_recovery_transno;
1906
1907         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1908                "req_transno: %llu, next_transno: %llu\n",
1909                obd->obd_max_recoverable_clients, connected, completed,
1910                queue_len, req_transno, next_transno);
1911
1912         if (obd->obd_abort_recovery) {
1913                 CDEBUG(D_HA, "waking for aborted recovery\n");
1914                 wake_up = 1;
1915         } else if (obd->obd_recovery_expired) {
1916                 CDEBUG(D_HA, "waking for expired recovery\n");
1917                 wake_up = 1;
1918         } else if (tdtd != NULL && req != NULL &&
1919                    is_req_replayed_by_update(req)) {
1920                 LASSERTF(req_transno < next_transno, "req_transno %llu"
1921                          "next_transno%llu\n", req_transno, next_transno);
1922                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
1923                        req_transno);
1924                 wake_up = 1;
1925         } else if (req_transno == next_transno ||
1926                    (update_transno != 0 && update_transno <= next_transno)) {
1927                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
1928                 wake_up = 1;
1929         } else if (queue_len > 0 &&
1930                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1931                 /** handle gaps occured due to lost reply or VBR */
1932                 LASSERTF(req_transno >= next_transno,
1933                          "req_transno: %llu, next_transno: %llu\n",
1934                          req_transno, next_transno);
1935                 CDEBUG(D_HA,
1936                        "%s: waking for gap in transno, VBR is %s (skip: "
1937                        "%lld, ql: %d, comp: %d, conn: %d, next: %lld"
1938                        ", next_update %lld last_committed: %lld)\n",
1939                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1940                        next_transno, queue_len, completed, connected,
1941                        req_transno, update_transno, obd->obd_last_committed);
1942                 obd->obd_next_recovery_transno = req_transno;
1943                 wake_up = 1;
1944         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1945                 CDEBUG(D_HA, "waking for completed recovery\n");
1946                 wake_up = 1;
1947         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1948                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1949                        " by fail_lock, waking up (%lld)\n", next_transno);
1950                 obd->obd_next_recovery_transno = req_transno;
1951                 wake_up = 1;
1952         }
1953         spin_unlock(&obd->obd_recovery_task_lock);
1954         return wake_up;
1955 }
1956
1957 static int check_for_next_lock(struct lu_target *lut)
1958 {
1959         struct obd_device *obd = lut->lut_obd;
1960         int wake_up = 0;
1961
1962         spin_lock(&obd->obd_recovery_task_lock);
1963         if (!list_empty(&obd->obd_lock_replay_queue)) {
1964                 CDEBUG(D_HA, "waking for next lock\n");
1965                 wake_up = 1;
1966         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1967                 CDEBUG(D_HA, "waking for completed lock replay\n");
1968                 wake_up = 1;
1969         } else if (obd->obd_abort_recovery) {
1970                 CDEBUG(D_HA, "waking for aborted recovery\n");
1971                 wake_up = 1;
1972         } else if (obd->obd_recovery_expired) {
1973                 CDEBUG(D_HA, "waking for expired recovery\n");
1974                 wake_up = 1;
1975         }
1976         spin_unlock(&obd->obd_recovery_task_lock);
1977
1978         return wake_up;
1979 }
1980
1981 /**
1982  * wait for recovery events,
1983  * check its status with help of check_routine
1984  * evict dead clients via health_check
1985  */
1986 static int target_recovery_overseer(struct lu_target *lut,
1987                                     int (*check_routine)(struct lu_target *),
1988                                     int (*health_check)(struct obd_export *))
1989 {
1990         struct obd_device       *obd = lut->lut_obd;
1991         struct target_distribute_txn_data *tdtd;
1992 repeat:
1993         if (obd->obd_recovery_start != 0 && ktime_get_real_seconds() >=
1994               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
1995                 __u64 next_update_transno = 0;
1996
1997                 /* Only abort the recovery if there are no update recovery
1998                  * left in the queue */
1999                 spin_lock(&obd->obd_recovery_task_lock);
2000                 if (lut->lut_tdtd != NULL) {
2001                         next_update_transno =
2002                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2003
2004                         tdtd = lut->lut_tdtd;
2005                         /* If next_update_transno == 0, it probably because
2006                          * updatelog retrieve threads did not get any records
2007                          * yet, let's wait those threads stopped */
2008                         if (next_update_transno == 0) {
2009                                 struct l_wait_info lwi = { 0 };
2010
2011                                 l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2012                                        atomic_read(
2013                                        &tdtd->tdtd_recovery_threads_count) == 0,
2014                                        &lwi);
2015
2016                                 next_update_transno =
2017                                         distribute_txn_get_next_transno(
2018                                                                 lut->lut_tdtd);
2019                         }
2020                 }
2021
2022                 if (next_update_transno != 0 && !obd->obd_abort_recovery) {
2023                         obd->obd_next_recovery_transno = next_update_transno;
2024                         spin_unlock(&obd->obd_recovery_task_lock);
2025                         /* Disconnect unfinished exports from clients, and
2026                          * keep connection from MDT to make sure the update
2027                          * recovery will still keep trying until some one
2028                          * manually abort the recovery */
2029                         class_disconnect_stale_exports(obd,
2030                                                 exp_finished_or_from_mdt);
2031                         /* Abort all of replay and replay lock req from
2032                          * clients */
2033                         abort_req_replay_queue(obd);
2034                         abort_lock_replay_queue(obd);
2035                         CDEBUG(D_HA, "%s: there are still update replay (%#llx"
2036                                ")in the queue.\n", obd->obd_name,
2037                                next_update_transno);
2038                 } else {
2039                         obd->obd_abort_recovery = 1;
2040                         spin_unlock(&obd->obd_recovery_task_lock);
2041                         CWARN("%s recovery is aborted by hard timeout\n",
2042                               obd->obd_name);
2043                 }
2044         }
2045
2046         while (wait_event_timeout(obd->obd_next_transno_waitq,
2047                                   check_routine(lut),
2048                                   msecs_to_jiffies(60 * MSEC_PER_SEC)) == 0)
2049                 /* wait indefinitely for event, but don't trigger watchdog */;
2050
2051         if (obd->obd_abort_recovery) {
2052                 CWARN("recovery is aborted, evict exports in recovery\n");
2053                 if (lut->lut_tdtd != NULL) {
2054                         struct l_wait_info lwi = { 0 };
2055
2056                         tdtd = lut->lut_tdtd;
2057                         /* Let's wait all of the update log recovery thread
2058                          * finished */
2059                         l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2060                          atomic_read(&tdtd->tdtd_recovery_threads_count) == 0,
2061                              &lwi);
2062                         /* Then abort the update recovery list */
2063                         dtrq_list_destroy(lut->lut_tdtd);
2064                 }
2065
2066                 /** evict exports which didn't finish recovery yet */
2067                 class_disconnect_stale_exports(obd, exp_finished);
2068                 return 1;
2069         } else if (obd->obd_recovery_expired) {
2070                 obd->obd_recovery_expired = 0;
2071                 /** If some clients died being recovered, evict them */
2072                 LCONSOLE_WARN("%s: recovery is timed out, "
2073                               "evict stale exports\n", obd->obd_name);
2074                 /** evict cexports with no replay in queue, they are stalled */
2075                 class_disconnect_stale_exports(obd, health_check);
2076
2077                 /** continue with VBR */
2078                 spin_lock(&obd->obd_dev_lock);
2079                 obd->obd_version_recov = 1;
2080                 spin_unlock(&obd->obd_dev_lock);
2081                 /**
2082                  * reset timer, recovery will proceed with versions now,
2083                  * timeout is set just to handle reconnection delays
2084                  */
2085                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2086                 /** Wait for recovery events again, after evicting bad clients */
2087                 goto repeat;
2088         }
2089         return 0;
2090 }
2091
2092 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2093 {
2094         struct obd_device       *obd = lut->lut_obd;
2095         struct ptlrpc_request *req = NULL;
2096
2097         CDEBUG(D_HA, "Waiting for lock\n");
2098         if (target_recovery_overseer(lut, check_for_next_lock,
2099                                      exp_lock_replay_healthy))
2100                 abort_lock_replay_queue(obd);
2101
2102         spin_lock(&obd->obd_recovery_task_lock);
2103         if (!list_empty(&obd->obd_lock_replay_queue)) {
2104                 req = list_entry(obd->obd_lock_replay_queue.next,
2105                                      struct ptlrpc_request, rq_list);
2106                 list_del_init(&req->rq_list);
2107                 spin_unlock(&obd->obd_recovery_task_lock);
2108         } else {
2109                 spin_unlock(&obd->obd_recovery_task_lock);
2110                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2111                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2112                 /** evict exports failed VBR */
2113                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2114         }
2115         return req;
2116 }
2117
2118 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2119 {
2120         struct ptlrpc_request *req = NULL;
2121
2122         spin_lock(&obd->obd_recovery_task_lock);
2123         if (!list_empty(&obd->obd_final_req_queue)) {
2124                 req = list_entry(obd->obd_final_req_queue.next,
2125                                      struct ptlrpc_request, rq_list);
2126                 list_del_init(&req->rq_list);
2127                 spin_unlock(&obd->obd_recovery_task_lock);
2128                 if (req->rq_export->exp_in_recovery) {
2129                         spin_lock(&req->rq_export->exp_lock);
2130                         req->rq_export->exp_in_recovery = 0;
2131                         spin_unlock(&req->rq_export->exp_lock);
2132                 }
2133         } else {
2134                 spin_unlock(&obd->obd_recovery_task_lock);
2135         }
2136         return req;
2137 }
2138
2139 static void handle_recovery_req(struct ptlrpc_thread *thread,
2140                                 struct ptlrpc_request *req,
2141                                 svc_handler_t handler)
2142 {
2143         ENTRY;
2144
2145         /**
2146          * export can be evicted during recovery, no need to handle replays for
2147          * it after that, discard such request silently
2148          */
2149         if (req->rq_export->exp_disconnected)
2150                 RETURN_EXIT;
2151
2152         req->rq_session.lc_thread = thread;
2153         req->rq_svc_thread = thread;
2154         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2155
2156         /* thread context */
2157         lu_context_enter(&thread->t_env->le_ctx);
2158         (void)handler(req);
2159         lu_context_exit(&thread->t_env->le_ctx);
2160
2161         /* don't reset timer for final stage */
2162         if (!exp_finished(req->rq_export)) {
2163                 int to = obd_timeout;
2164
2165                 /**
2166                  * Add request timeout to the recovery time so next request from
2167                  * this client may come in recovery time
2168                  */
2169                 if (!AT_OFF) {
2170                         struct ptlrpc_service_part *svcpt;
2171
2172                         svcpt = req->rq_rqbd->rqbd_svcpt;
2173                         /* If the server sent early reply for this request,
2174                          * the client will recalculate the timeout according to
2175                          * current server estimate service time, so we will
2176                          * use the maxium timeout here for waiting the client
2177                          * sending the next req */
2178                         to = max((int)at_est2timeout(
2179                                  at_get(&svcpt->scp_at_estimate)),
2180                                  (int)lustre_msg_get_timeout(req->rq_reqmsg));
2181                         /* Add 2 net_latency, one for balance rq_deadline
2182                          * (see ptl_send_rpc), one for resend the req to server,
2183                          * Note: client will pack net_latency in replay req
2184                          * (see ptlrpc_replay_req) */
2185                         to += 2 * lustre_msg_get_service_time(req->rq_reqmsg);
2186                 }
2187                 extend_recovery_timer(class_exp2obd(req->rq_export), to, true);
2188         }
2189         EXIT;
2190 }
2191
2192 /** Checking routines for recovery */
2193 static int check_for_recovery_ready(struct lu_target *lut)
2194 {
2195         struct obd_device *obd = lut->lut_obd;
2196         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2197
2198         CDEBUG(D_HA, "connected %d stale %d max_recoverable_clients %d"
2199                " abort %d expired %d\n", clnts, obd->obd_stale_clients,
2200                obd->obd_max_recoverable_clients, obd->obd_abort_recovery,
2201                obd->obd_recovery_expired);
2202
2203         if (!obd->obd_abort_recovery && !obd->obd_recovery_expired) {
2204                 LASSERT(clnts <= obd->obd_max_recoverable_clients);
2205                 if (clnts + obd->obd_stale_clients <
2206                     obd->obd_max_recoverable_clients)
2207                         return 0;
2208         }
2209
2210         if (lut->lut_tdtd != NULL) {
2211                 if (!lut->lut_tdtd->tdtd_replay_ready &&
2212                     !obd->obd_abort_recovery) {
2213                         /* Let's extend recovery timer, in case the recovery
2214                          * timer expired, and some clients got evicted */
2215                         extend_recovery_timer(obd, obd->obd_recovery_timeout,
2216                                               true);
2217                         CDEBUG(D_HA, "%s update recovery is not ready, extend recovery %llu\n",
2218                                obd->obd_name, obd->obd_recovery_timeout);
2219                         return 0;
2220                 }
2221         }
2222
2223         return 1;
2224 }
2225
2226 enum {
2227         REQUEST_RECOVERY = 1,
2228         UPDATE_RECOVERY = 2,
2229 };
2230
2231 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2232 {
2233         __u64 transno = 0;
2234
2235         if (!list_empty(&obd->obd_req_replay_queue)) {
2236                 struct ptlrpc_request *req;
2237
2238                 req = list_entry(obd->obd_req_replay_queue.next,
2239                                  struct ptlrpc_request, rq_list);
2240                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2241         }
2242
2243         return transno;
2244 }
2245
2246 static __u64 get_next_transno(struct lu_target *lut, int *type)
2247 {
2248         struct obd_device *obd = lut->lut_obd;
2249         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2250         __u64 transno = 0;
2251         __u64 update_transno;
2252         ENTRY;
2253
2254         transno = get_next_replay_req_transno(obd);
2255         if (type != NULL)
2256                 *type = REQUEST_RECOVERY;
2257
2258         if (tdtd == NULL)
2259                 RETURN(transno);
2260
2261         update_transno = distribute_txn_get_next_transno(tdtd);
2262         if (transno == 0 || (transno >= update_transno &&
2263                              update_transno != 0)) {
2264                 transno = update_transno;
2265                 if (type != NULL)
2266                         *type = UPDATE_RECOVERY;
2267         }
2268
2269         RETURN(transno);
2270 }
2271
2272 /**
2273  * drop duplicate replay request
2274  *
2275  * Because the operation has been replayed by update recovery, the request
2276  * with the same transno will be dropped and also notify the client to send
2277  * next replay request.
2278  *
2279  * \param[in] env       execution environment
2280  * \param[in] obd       failover obd device
2281  * \param[in] req       request to be dropped
2282  */
2283 static void drop_duplicate_replay_req(struct lu_env *env,
2284                                       struct obd_device *obd,
2285                                       struct ptlrpc_request *req)
2286 {
2287         DEBUG_REQ(D_HA, req, "remove t%lld from %s because of duplicate"
2288                   " update records are found.\n",
2289                   lustre_msg_get_transno(req->rq_reqmsg),
2290                   libcfs_nid2str(req->rq_peer.nid));
2291
2292         /* Right now, only for MDS reint operation update replay and
2293          * normal request replay can have the same transno */
2294         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT) {
2295                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2296                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2297                 if (likely(req->rq_export))
2298                         target_committed_to_req(req);
2299                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2300                 target_send_reply(req, req->rq_status, 0);
2301         } else {
2302                 DEBUG_REQ(D_ERROR, req, "wrong opc" "from %s\n",
2303                 libcfs_nid2str(req->rq_peer.nid));
2304         }
2305         target_exp_dequeue_req_replay(req);
2306         target_request_copy_put(req);
2307         obd->obd_replayed_requests++;
2308 }
2309
2310 static void replay_request_or_update(struct lu_env *env,
2311                                      struct lu_target *lut,
2312                                      struct target_recovery_data *trd,
2313                                      struct ptlrpc_thread *thread)
2314 {
2315         struct obd_device *obd = lut->lut_obd;
2316         struct ptlrpc_request *req = NULL;
2317         int                     type;
2318         __u64                   transno;
2319         ENTRY;
2320
2321         CDEBUG(D_HA, "Waiting for transno %lld\n",
2322                obd->obd_next_recovery_transno);
2323
2324         /* Replay all of request and update by transno */
2325         do {
2326                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2327
2328                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2329
2330                 /** It is needed to extend recovery window above
2331                  *  recovery_time_soft. Extending is possible only in the
2332                  *  end of recovery window (see more details in
2333                  *  handle_recovery_req()).
2334                  */
2335                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2336
2337                 if (target_recovery_overseer(lut, check_for_next_transno,
2338                                         exp_req_replay_healthy_or_from_mdt)) {
2339                         abort_req_replay_queue(obd);
2340                         abort_lock_replay_queue(obd);
2341                         goto abort;
2342                 }
2343
2344                 spin_lock(&obd->obd_recovery_task_lock);
2345                 transno = get_next_transno(lut, &type);
2346                 if (type == REQUEST_RECOVERY && transno != 0) {
2347                         /* Drop replay request from client side, if the
2348                          * replay has been executed by update with the
2349                          * same transno */
2350                         req = list_entry(obd->obd_req_replay_queue.next,
2351                                         struct ptlrpc_request, rq_list);
2352
2353                         list_del_init(&req->rq_list);
2354                         obd->obd_requests_queued_for_recovery--;
2355                         spin_unlock(&obd->obd_recovery_task_lock);
2356
2357                         /* Let's check if the request has been redone by
2358                          * update replay */
2359                         if (is_req_replayed_by_update(req)) {
2360                                 struct distribute_txn_replay_req *dtrq;
2361
2362                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2363                                                                    req->rq_xid);
2364                                 LASSERT(dtrq != NULL);
2365                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2366                                 list_del_init(&dtrq->dtrq_list);
2367                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2368                                 dtrq_destroy(dtrq);
2369
2370                                 drop_duplicate_replay_req(env, obd, req);
2371
2372                                 continue;
2373                         }
2374
2375                         LASSERT(trd->trd_processing_task == current_pid());
2376                         DEBUG_REQ(D_HA, req, "processing t%lld from %s",
2377                                   lustre_msg_get_transno(req->rq_reqmsg),
2378                                   libcfs_nid2str(req->rq_peer.nid));
2379
2380                         handle_recovery_req(thread, req,
2381                                             trd->trd_recovery_handler);
2382                         /**
2383                          * bz18031: increase next_recovery_transno before
2384                          * target_request_copy_put() will drop exp_rpc reference
2385                          */
2386                         spin_lock(&obd->obd_recovery_task_lock);
2387                         obd->obd_next_recovery_transno++;
2388                         spin_unlock(&obd->obd_recovery_task_lock);
2389                         target_exp_dequeue_req_replay(req);
2390                         target_request_copy_put(req);
2391                         obd->obd_replayed_requests++;
2392                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2393                         struct distribute_txn_replay_req *dtrq;
2394                         int rc;
2395
2396                         spin_unlock(&obd->obd_recovery_task_lock);
2397
2398                         LASSERT(tdtd != NULL);
2399                         dtrq = distribute_txn_get_next_req(tdtd);
2400                         lu_context_enter(&thread->t_env->le_ctx);
2401                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2402                         lu_context_exit(&thread->t_env->le_ctx);
2403                         extend_recovery_timer(obd, obd_timeout, true);
2404
2405                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2406                                 CDEBUG(D_HA, "Move x%llu t%llu"
2407                                        " to finish list\n", dtrq->dtrq_xid,
2408                                        dtrq->dtrq_master_transno);
2409
2410                                 /* Add it to the replay finish list */
2411                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2412                                 list_add(&dtrq->dtrq_list,
2413                                          &tdtd->tdtd_replay_finish_list);
2414                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2415
2416                                 spin_lock(&obd->obd_recovery_task_lock);
2417                                 if (transno == obd->obd_next_recovery_transno)
2418                                         obd->obd_next_recovery_transno++;
2419                                 else if (transno >
2420                                          obd->obd_next_recovery_transno)
2421                                         obd->obd_next_recovery_transno =
2422                                                                 transno + 1;
2423                                 spin_unlock(&obd->obd_recovery_task_lock);
2424                         } else {
2425                                 dtrq_destroy(dtrq);
2426                         }
2427                 } else {
2428                         spin_unlock(&obd->obd_recovery_task_lock);
2429 abort:
2430                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2431                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2432                         /** evict exports failed VBR */
2433                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2434                         break;
2435                 }
2436         } while (1);
2437 }
2438
2439 static int target_recovery_thread(void *arg)
2440 {
2441         struct lu_target *lut = arg;
2442         struct obd_device *obd = lut->lut_obd;
2443         struct ptlrpc_request *req;
2444         struct target_recovery_data *trd = &obd->obd_recovery_data;
2445         unsigned long delta;
2446         struct lu_env *env;
2447         struct ptlrpc_thread *thread = NULL;
2448         int rc = 0;
2449         ENTRY;
2450
2451         unshare_fs_struct();
2452         OBD_ALLOC_PTR(thread);
2453         if (thread == NULL)
2454                 RETURN(-ENOMEM);
2455
2456         OBD_ALLOC_PTR(env);
2457         if (env == NULL) {
2458                 OBD_FREE_PTR(thread);
2459                 RETURN(-ENOMEM);
2460         }
2461
2462         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2463         if (rc) {
2464                 OBD_FREE_PTR(thread);
2465                 OBD_FREE_PTR(env);
2466                 RETURN(rc);
2467         }
2468
2469         thread->t_env = env;
2470         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2471         env->le_ctx.lc_thread = thread;
2472         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2473         thread->t_watchdog = NULL;
2474
2475         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2476                current_pid());
2477         trd->trd_processing_task = current_pid();
2478
2479         spin_lock(&obd->obd_dev_lock);
2480         obd->obd_recovering = 1;
2481         spin_unlock(&obd->obd_dev_lock);
2482         complete(&trd->trd_starting);
2483
2484         /* first of all, we have to know the first transno to replay */
2485         if (target_recovery_overseer(lut, check_for_recovery_ready,
2486                                      exp_connect_healthy)) {
2487                 abort_req_replay_queue(obd);
2488                 abort_lock_replay_queue(obd);
2489                 if (lut->lut_tdtd != NULL)
2490                         dtrq_list_destroy(lut->lut_tdtd);
2491         }
2492
2493         /* next stage: replay requests or update */
2494         delta = jiffies;
2495         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2496                atomic_read(&obd->obd_req_replay_clients),
2497                obd->obd_next_recovery_transno);
2498         replay_request_or_update(env, lut, trd, thread);
2499
2500         /**
2501          * The second stage: replay locks
2502          */
2503         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2504                atomic_read(&obd->obd_lock_replay_clients));
2505         while ((req = target_next_replay_lock(lut))) {
2506                 LASSERT(trd->trd_processing_task == current_pid());
2507                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
2508                           libcfs_nid2str(req->rq_peer.nid));
2509                 handle_recovery_req(thread, req,
2510                                     trd->trd_recovery_handler);
2511                 target_request_copy_put(req);
2512                 obd->obd_replayed_locks++;
2513         }
2514
2515         /**
2516          * The third stage: reply on final pings, at this moment all clients
2517          * must have request in final queue
2518          */
2519         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2520         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2521         /** Update server last boot epoch */
2522         tgt_boot_epoch_update(lut);
2523         /* We drop recoverying flag to forward all new requests
2524          * to regular mds_handle() since now */
2525         spin_lock(&obd->obd_dev_lock);
2526         obd->obd_recovering = obd->obd_abort_recovery = 0;
2527         spin_unlock(&obd->obd_dev_lock);
2528         spin_lock(&obd->obd_recovery_task_lock);
2529         target_cancel_recovery_timer(obd);
2530         spin_unlock(&obd->obd_recovery_task_lock);
2531         while ((req = target_next_final_ping(obd))) {
2532                 LASSERT(trd->trd_processing_task == current_pid());
2533                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
2534                           libcfs_nid2str(req->rq_peer.nid));
2535                 handle_recovery_req(thread, req,
2536                                     trd->trd_recovery_handler);
2537                 /* Because the waiting client can not send ping to server,
2538                  * so we need refresh the last_request_time, to avoid the
2539                  * export is being evicted */
2540                 ptlrpc_update_export_timer(req->rq_export, 0);
2541                 target_request_copy_put(req);
2542         }
2543
2544         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2545         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
2546               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2547         if (delta > OBD_RECOVERY_TIME_SOFT) {
2548                 CWARN("too long recovery - read logs\n");
2549                 libcfs_debug_dumplog();
2550         }
2551
2552         target_finish_recovery(lut);
2553
2554         lu_context_fini(&env->le_ctx);
2555         trd->trd_processing_task = 0;
2556         complete(&trd->trd_finishing);
2557
2558         tgt_io_thread_done(thread);
2559         OBD_FREE_PTR(thread);
2560         OBD_FREE_PTR(env);
2561         RETURN(rc);
2562 }
2563
2564 static int target_start_recovery_thread(struct lu_target *lut,
2565                                         svc_handler_t handler)
2566 {
2567         struct obd_device *obd = lut->lut_obd;
2568         int rc = 0;
2569         struct target_recovery_data *trd = &obd->obd_recovery_data;
2570         int index;
2571
2572         memset(trd, 0, sizeof(*trd));
2573         init_completion(&trd->trd_starting);
2574         init_completion(&trd->trd_finishing);
2575         trd->trd_recovery_handler = handler;
2576
2577         rc = server_name2index(obd->obd_name, &index, NULL);
2578         if (rc < 0)
2579                 return rc;
2580
2581         if (!IS_ERR(kthread_run(target_recovery_thread,
2582                                 lut, "tgt_recover_%d", index))) {
2583                 wait_for_completion(&trd->trd_starting);
2584                 LASSERT(obd->obd_recovering != 0);
2585         } else {
2586                 rc = -ECHILD;
2587         }
2588
2589         return rc;
2590 }
2591
2592 void target_stop_recovery_thread(struct obd_device *obd)
2593 {
2594         if (obd->obd_recovery_data.trd_processing_task > 0) {
2595                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2596                 /** recovery can be done but postrecovery is not yet */
2597                 spin_lock(&obd->obd_dev_lock);
2598                 if (obd->obd_recovering) {
2599                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2600                         obd->obd_abort_recovery = 1;
2601                         wake_up(&obd->obd_next_transno_waitq);
2602                 }
2603                 spin_unlock(&obd->obd_dev_lock);
2604                 wait_for_completion(&trd->trd_finishing);
2605         }
2606 }
2607 EXPORT_SYMBOL(target_stop_recovery_thread);
2608
2609 void target_recovery_fini(struct obd_device *obd)
2610 {
2611         class_disconnect_exports(obd);
2612         target_stop_recovery_thread(obd);
2613         target_cleanup_recovery(obd);
2614 }
2615 EXPORT_SYMBOL(target_recovery_fini);
2616
2617 static void target_recovery_expired(unsigned long castmeharder)
2618 {
2619         struct obd_device *obd = (struct obd_device *)castmeharder;
2620         CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
2621                " after %llus (%d clients connected)\n",
2622                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2623                (s64)(ktime_get_real_seconds() - obd->obd_recovery_start),
2624                atomic_read(&obd->obd_connected_clients));
2625
2626         obd->obd_recovery_expired = 1;
2627         wake_up(&obd->obd_next_transno_waitq);
2628 }
2629
2630 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2631 {
2632         struct obd_device *obd = lut->lut_obd;
2633
2634         if (lut->lut_bottom->dd_rdonly)
2635                 return;
2636
2637         if (obd->obd_max_recoverable_clients == 0) {
2638                 /** Update server last boot epoch */
2639                 tgt_boot_epoch_update(lut);
2640                 return;
2641         }
2642
2643         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2644                "last_transno %llu\n", obd->obd_name,
2645                obd->obd_max_recoverable_clients, obd->obd_last_committed);
2646         LASSERT(obd->obd_stopping == 0);
2647         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2648         obd->obd_recovery_start = 0;
2649         obd->obd_recovery_end = 0;
2650
2651         setup_timer(&obd->obd_recovery_timer, target_recovery_expired,
2652                     (unsigned long)obd);
2653         target_start_recovery_thread(lut, handler);
2654 }
2655 EXPORT_SYMBOL(target_recovery_init);
2656
2657 static int target_process_req_flags(struct obd_device *obd,
2658                                     struct ptlrpc_request *req)
2659 {
2660         struct obd_export *exp = req->rq_export;
2661         LASSERT(exp != NULL);
2662         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2663                 /* client declares he's ready to replay locks */
2664                 spin_lock(&exp->exp_lock);
2665                 if (exp->exp_req_replay_needed) {
2666                         exp->exp_req_replay_needed = 0;
2667                         spin_unlock(&exp->exp_lock);
2668
2669                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2670                         atomic_dec(&obd->obd_req_replay_clients);
2671                 } else {
2672                         spin_unlock(&exp->exp_lock);
2673                 }
2674         }
2675         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2676                 /* client declares he's ready to complete recovery
2677                  * so, we put the request on th final queue */
2678                 spin_lock(&exp->exp_lock);
2679                 if (exp->exp_lock_replay_needed) {
2680                         exp->exp_lock_replay_needed = 0;
2681                         spin_unlock(&exp->exp_lock);
2682
2683                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
2684                         atomic_dec(&obd->obd_lock_replay_clients);
2685                 } else {
2686                         spin_unlock(&exp->exp_lock);
2687                 }
2688         }
2689         return 0;
2690 }
2691
2692 int target_queue_recovery_request(struct ptlrpc_request *req,
2693                                   struct obd_device *obd)
2694 {
2695         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
2696         struct ptlrpc_request *reqiter;
2697         int inserted = 0;
2698         ENTRY;
2699
2700         if (obd->obd_recovery_data.trd_processing_task == current_pid()) {
2701                 /* Processing the queue right now, don't re-add. */
2702                 RETURN(1);
2703         }
2704
2705         target_process_req_flags(obd, req);
2706
2707         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2708                 /* client declares he's ready to complete recovery
2709                  * so, we put the request on th final queue */
2710                 target_request_copy_get(req);
2711                 DEBUG_REQ(D_HA, req, "queue final req");
2712                 wake_up(&obd->obd_next_transno_waitq);
2713                 spin_lock(&obd->obd_recovery_task_lock);
2714                 if (obd->obd_recovering) {
2715                         struct ptlrpc_request *tmp;
2716                         struct ptlrpc_request *duplicate = NULL;
2717
2718                         if (likely(!req->rq_export->exp_replay_done)) {
2719                                 req->rq_export->exp_replay_done = 1;
2720                                 list_add_tail(&req->rq_list,
2721                                               &obd->obd_final_req_queue);
2722                                 spin_unlock(&obd->obd_recovery_task_lock);
2723                                 RETURN(0);
2724                         }
2725
2726                         /* XXX O(n), but only happens if final ping is
2727                          * timed out, probably reorganize the list as
2728                          * a hash list later */
2729                         list_for_each_entry_safe(reqiter, tmp,
2730                                                  &obd->obd_final_req_queue,
2731                                                  rq_list) {
2732                                 if (reqiter->rq_export == req->rq_export) {
2733                                         list_del_init(&reqiter->rq_list);
2734                                         duplicate = reqiter;
2735                                         break;
2736                                 }
2737                         }
2738
2739                         list_add_tail(&req->rq_list,
2740                                       &obd->obd_final_req_queue);
2741                         req->rq_export->exp_replay_done = 1;
2742                         spin_unlock(&obd->obd_recovery_task_lock);
2743
2744                         if (duplicate != NULL) {
2745                                 DEBUG_REQ(D_HA, duplicate,
2746                                           "put prev final req\n");
2747                                 target_request_copy_put(duplicate);
2748                         }
2749                         RETURN(0);
2750                 } else {
2751                         spin_unlock(&obd->obd_recovery_task_lock);
2752                         target_request_copy_put(req);
2753                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
2754                 }
2755         }
2756         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2757                 /* client declares he's ready to replay locks */
2758                 target_request_copy_get(req);
2759                 DEBUG_REQ(D_HA, req, "queue lock replay req");
2760                 wake_up(&obd->obd_next_transno_waitq);
2761                 spin_lock(&obd->obd_recovery_task_lock);
2762                 LASSERT(obd->obd_recovering);
2763                 /* usually due to recovery abort */
2764                 if (!req->rq_export->exp_in_recovery) {
2765                         spin_unlock(&obd->obd_recovery_task_lock);
2766                         target_request_copy_put(req);
2767                         RETURN(-ENOTCONN);
2768                 }
2769                 LASSERT(req->rq_export->exp_lock_replay_needed);
2770                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
2771                 spin_unlock(&obd->obd_recovery_task_lock);
2772                 RETURN(0);
2773         }
2774
2775         /* CAVEAT EMPTOR: The incoming request message has been swabbed
2776          * (i.e. buflens etc are in my own byte order), but type-dependent
2777          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed. */
2778
2779         if (!transno) {
2780                 INIT_LIST_HEAD(&req->rq_list);
2781                 DEBUG_REQ(D_HA, req, "not queueing");
2782                 RETURN(1);
2783         }
2784
2785         /* If we're processing the queue, we want don't want to queue this
2786          * message.
2787          *
2788          * Also, if this request has a transno less than the one we're waiting
2789          * for, we should process it now.  It could (and currently always will)
2790          * be an open request for a descriptor that was opened some time ago.
2791          *
2792          * Also, a resent, replayed request that has already been
2793          * handled will pass through here and be processed immediately.
2794          */
2795         CDEBUG(D_HA, "Next recovery transno: %llu"
2796                ", current: %llu, replaying\n",
2797                obd->obd_next_recovery_transno, transno);
2798
2799         /* If the request has been replayed by update replay, then sends this
2800          * request to the recovery thread (replay_request_or_update()), where
2801          * it will be handled */
2802         spin_lock(&obd->obd_recovery_task_lock);
2803         if (transno < obd->obd_next_recovery_transno &&
2804             !is_req_replayed_by_update(req)) {
2805                 /* Processing the queue right now, don't re-add. */
2806                 LASSERT(list_empty(&req->rq_list));
2807                 spin_unlock(&obd->obd_recovery_task_lock);
2808                 RETURN(1);
2809         }
2810         spin_unlock(&obd->obd_recovery_task_lock);
2811
2812         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2813                 RETURN(0);
2814
2815         target_request_copy_get(req);
2816         if (!req->rq_export->exp_in_recovery) {
2817                 target_request_copy_put(req);
2818                 RETURN(-ENOTCONN);
2819         }
2820         LASSERT(req->rq_export->exp_req_replay_needed);
2821
2822         if (target_exp_enqueue_req_replay(req)) {
2823                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2824                 target_request_copy_put(req);
2825                 RETURN(0);
2826         }
2827
2828         /* XXX O(n^2) */
2829         spin_lock(&obd->obd_recovery_task_lock);
2830         LASSERT(obd->obd_recovering);
2831         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
2832                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2833                         list_add_tail(&req->rq_list, &reqiter->rq_list);
2834                         inserted = 1;
2835                         goto added;
2836                 }
2837
2838                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2839                              transno)) {
2840                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2841                                   "has been claimed by another client");
2842                         spin_unlock(&obd->obd_recovery_task_lock);
2843                         target_exp_dequeue_req_replay(req);
2844                         target_request_copy_put(req);
2845                         RETURN(0);
2846                 }
2847         }
2848 added:
2849         if (!inserted)
2850                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2851
2852         obd->obd_requests_queued_for_recovery++;
2853         spin_unlock(&obd->obd_recovery_task_lock);
2854         wake_up(&obd->obd_next_transno_waitq);
2855         RETURN(0);
2856 }
2857
2858 int target_handle_ping(struct ptlrpc_request *req)
2859 {
2860         obd_ping(req->rq_svc_thread->t_env, req->rq_export);
2861         return req_capsule_server_pack(&req->rq_pill);
2862 }
2863
2864 void target_committed_to_req(struct ptlrpc_request *req)
2865 {
2866         struct obd_export *exp = req->rq_export;
2867
2868         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2869                 lustre_msg_set_last_committed(req->rq_repmsg,
2870                                               exp->exp_last_committed);
2871         else
2872                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2873                           "%d)", exp->exp_obd->obd_no_transno,
2874                           req->rq_repmsg == NULL);
2875
2876         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
2877                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2878 }
2879
2880 #endif /* HAVE_SERVER_SUPPORT */
2881
2882 /**
2883  * Packs current SLV and Limit into \a req.
2884  */
2885 int target_pack_pool_reply(struct ptlrpc_request *req)
2886 {
2887         struct obd_device *obd;
2888         ENTRY;
2889
2890         /* Check that we still have all structures alive as this may
2891          * be some late RPC at shutdown time. */
2892         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2893                      !exp_connect_lru_resize(req->rq_export))) {
2894                 lustre_msg_set_slv(req->rq_repmsg, 0);
2895                 lustre_msg_set_limit(req->rq_repmsg, 0);
2896                 RETURN(0);
2897         }
2898
2899         /* OBD is alive here as export is alive, which we checked above. */
2900         obd = req->rq_export->exp_obd;
2901
2902         read_lock(&obd->obd_pool_lock);
2903         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2904         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2905         read_unlock(&obd->obd_pool_lock);
2906
2907         RETURN(0);
2908 }
2909
2910 static int target_send_reply_msg(struct ptlrpc_request *req,
2911                                  int rc, int fail_id)
2912 {
2913         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2914                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2915                 return -ECOMM;
2916         }
2917         /* We can have a null rq_reqmsg in the event of bad signature or
2918          * no context when unwrapping */
2919         if (req->rq_reqmsg &&
2920             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
2921             OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
2922                 return -ECOMM;
2923
2924         if (unlikely(rc)) {
2925                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
2926                 req->rq_status = rc;
2927                 return ptlrpc_send_error(req, 1);
2928         } else {
2929                 DEBUG_REQ(D_NET, req, "sending reply");
2930         }
2931
2932         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
2933 }
2934
2935 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2936 {
2937         struct ptlrpc_service_part *svcpt;
2938         int                        netrc;
2939         struct ptlrpc_reply_state *rs;
2940         struct obd_export         *exp;
2941         ENTRY;
2942
2943         if (req->rq_no_reply) {
2944                 EXIT;
2945                 return;
2946         }
2947
2948         svcpt = req->rq_rqbd->rqbd_svcpt;
2949         rs = req->rq_reply_state;
2950         if (rs == NULL || !rs->rs_difficult) {
2951                 /* no notifiers */
2952                 target_send_reply_msg (req, rc, fail_id);
2953                 EXIT;
2954                 return;
2955         }
2956
2957         /* must be an export if locks saved */
2958         LASSERT(req->rq_export != NULL);
2959         /* req/reply consistent */
2960         LASSERT(rs->rs_svcpt == svcpt);
2961
2962         /* "fresh" reply */
2963         LASSERT(!rs->rs_scheduled);
2964         LASSERT(!rs->rs_scheduled_ever);
2965         LASSERT(!rs->rs_handled);
2966         LASSERT(!rs->rs_on_net);
2967         LASSERT(rs->rs_export == NULL);
2968         LASSERT(list_empty(&rs->rs_obd_list));
2969         LASSERT(list_empty(&rs->rs_exp_list));
2970
2971         exp = class_export_get(req->rq_export);
2972
2973         /* disable reply scheduling while I'm setting up */
2974         rs->rs_scheduled = 1;
2975         rs->rs_on_net    = 1;
2976         rs->rs_xid       = req->rq_xid;
2977         rs->rs_transno   = req->rq_transno;
2978         rs->rs_export    = exp;
2979         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
2980
2981         spin_lock(&exp->exp_uncommitted_replies_lock);
2982         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
2983                rs->rs_transno, exp->exp_last_committed);
2984         if (rs->rs_transno > exp->exp_last_committed) {
2985                 /* not committed already */
2986                 list_add_tail(&rs->rs_obd_list,
2987                                   &exp->exp_uncommitted_replies);
2988         }
2989         spin_unlock(&exp->exp_uncommitted_replies_lock);
2990
2991         spin_lock(&exp->exp_lock);
2992         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
2993         spin_unlock(&exp->exp_lock);
2994
2995         netrc = target_send_reply_msg(req, rc, fail_id);
2996
2997         spin_lock(&svcpt->scp_rep_lock);
2998
2999         atomic_inc(&svcpt->scp_nreps_difficult);
3000
3001         if (netrc != 0) {
3002                 /* error sending: reply is off the net.  Also we need +1
3003                  * reply ref until ptlrpc_handle_rs() is done
3004                  * with the reply state (if the send was successful, there
3005                  * would have been +1 ref for the net, which
3006                  * reply_out_callback leaves alone) */
3007                 rs->rs_on_net = 0;
3008                 ptlrpc_rs_addref(rs);
3009         }
3010
3011         spin_lock(&rs->rs_lock);
3012         if (rs->rs_transno <= exp->exp_last_committed ||
3013             (!rs->rs_on_net && !rs->rs_no_ack) ||
3014             list_empty(&rs->rs_exp_list) ||     /* completed already */
3015             list_empty(&rs->rs_obd_list)) {
3016                 CDEBUG(D_HA, "Schedule reply immediately\n");
3017                 ptlrpc_dispatch_difficult_reply(rs);
3018         } else {
3019                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
3020                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
3021         }
3022         spin_unlock(&rs->rs_lock);
3023         spin_unlock(&svcpt->scp_rep_lock);
3024         EXIT;
3025 }
3026
3027 enum ldlm_mode lck_compat_array[] = {
3028         [LCK_EX]    = LCK_COMPAT_EX,
3029         [LCK_PW]    = LCK_COMPAT_PW,
3030         [LCK_PR]    = LCK_COMPAT_PR,
3031         [LCK_CW]    = LCK_COMPAT_CW,
3032         [LCK_CR]    = LCK_COMPAT_CR,
3033         [LCK_NL]    = LCK_COMPAT_NL,
3034         [LCK_GROUP] = LCK_COMPAT_GROUP,
3035         [LCK_COS]   = LCK_COMPAT_COS,
3036 };
3037
3038 /**
3039  * Rather arbitrary mapping from LDLM error codes to errno values. This should
3040  * not escape to the user level.
3041  */
3042 int ldlm_error2errno(enum ldlm_error error)
3043 {
3044         int result;
3045
3046         switch (error) {
3047         case ELDLM_OK:
3048         case ELDLM_LOCK_MATCHED:
3049                 result = 0;
3050                 break;
3051         case ELDLM_LOCK_CHANGED:
3052                 result = -ESTALE;
3053                 break;
3054         case ELDLM_LOCK_ABORTED:
3055                 result = -ENAVAIL;
3056                 break;
3057         case ELDLM_LOCK_REPLACED:
3058                 result = -ESRCH;
3059                 break;
3060         case ELDLM_NO_LOCK_DATA:
3061                 result = -ENOENT;
3062                 break;
3063         case ELDLM_NAMESPACE_EXISTS:
3064                 result = -EEXIST;
3065                 break;
3066         case ELDLM_BAD_NAMESPACE:
3067                 result = -EBADF;
3068                 break;
3069         default:
3070                 if (((int)error) < 0) { /* cast to signed type */
3071                         result = error; /* as ldlm_error can be unsigned */
3072                 } else {
3073                         CERROR("Invalid DLM result code: %d\n", error);
3074                         result = -EPROTO;
3075                 }
3076         }
3077         return result;
3078 }
3079 EXPORT_SYMBOL(ldlm_error2errno);
3080
3081 /**
3082  * Dual to ldlm_error2errno(): maps errno values back to enum ldlm_error.
3083  */
3084 enum ldlm_error ldlm_errno2error(int err_no)
3085 {
3086         int error;
3087
3088         switch (err_no) {
3089         case 0:
3090                 error = ELDLM_OK;
3091                 break;
3092         case -ESTALE:
3093                 error = ELDLM_LOCK_CHANGED;
3094                 break;
3095         case -ENAVAIL:
3096                 error = ELDLM_LOCK_ABORTED;
3097                 break;
3098         case -ESRCH:
3099                 error = ELDLM_LOCK_REPLACED;
3100                 break;
3101         case -ENOENT:
3102                 error = ELDLM_NO_LOCK_DATA;
3103                 break;
3104         case -EEXIST:
3105                 error = ELDLM_NAMESPACE_EXISTS;
3106                 break;
3107         case -EBADF:
3108                 error = ELDLM_BAD_NAMESPACE;
3109                 break;
3110         default:
3111                 error = err_no;
3112         }
3113         return error;
3114 }
3115
3116 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3117 void ldlm_dump_export_locks(struct obd_export *exp)
3118 {
3119         spin_lock(&exp->exp_locks_list_guard);
3120         if (!list_empty(&exp->exp_locks_list)) {
3121                 struct ldlm_lock *lock;
3122
3123                 CERROR("dumping locks for export %p,"
3124                        "ignore if the unmount doesn't hang\n", exp);
3125                 list_for_each_entry(lock, &exp->exp_locks_list,
3126                                         l_exp_refs_link)
3127                         LDLM_ERROR(lock, "lock:");
3128         }
3129         spin_unlock(&exp->exp_locks_list_guard);
3130 }
3131 #endif
3132
3133 #ifdef HAVE_SERVER_SUPPORT
3134 static int target_bulk_timeout(void *data)
3135 {
3136         ENTRY;
3137         /* We don't fail the connection here, because having the export
3138          * killed makes the (vital) call to commitrw very sad.
3139          */
3140         RETURN(1);
3141 }
3142
3143 static inline const char *bulk2type(struct ptlrpc_request *req)
3144 {
3145         if (req->rq_bulk_read)
3146                 return "READ";
3147         if (req->rq_bulk_write)
3148                 return "WRITE";
3149         return "UNKNOWN";
3150 }
3151
3152 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc,
3153                    struct l_wait_info *lwi)
3154 {
3155         struct ptlrpc_request   *req = desc->bd_req;
3156         time_t                   start = cfs_time_current_sec();
3157         time_t                   deadline;
3158         int                      rc = 0;
3159
3160         ENTRY;
3161
3162         /* If there is eviction in progress, wait for it to finish. */
3163         if (unlikely(atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
3164                 *lwi = LWI_INTR(NULL, NULL);
3165                 rc = l_wait_event(exp->exp_obd->obd_evict_inprogress_waitq,
3166                                   !atomic_read(&exp->exp_obd->
3167                                                    obd_evict_inprogress),
3168                                   lwi);
3169         }
3170
3171         /* Check if client was evicted or reconnected already. */
3172         if (exp->exp_failed ||
3173             exp->exp_conn_cnt > lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3174                 rc = -ENOTCONN;
3175         } else {
3176                 if (req->rq_bulk_read)
3177                         rc = sptlrpc_svc_wrap_bulk(req, desc);
3178
3179                 if (OCD_HAS_FLAG(&exp->exp_connect_data, BULK_MBITS))
3180                         req->rq_mbits = lustre_msg_get_mbits(req->rq_reqmsg);
3181                 else /* old version, bulk matchbits is rq_xid */
3182                         req->rq_mbits = req->rq_xid;
3183
3184                 if (rc == 0)
3185                         rc = ptlrpc_start_bulk_transfer(desc);
3186         }
3187
3188         if (rc < 0) {
3189                 DEBUG_REQ(D_ERROR, req, "bulk %s failed: rc %d",
3190                           bulk2type(req), rc);
3191                 RETURN(rc);
3192         }
3193
3194         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
3195                 ptlrpc_abort_bulk(desc);
3196                 RETURN(0);
3197         }
3198
3199         /* limit actual bulk transfer to bulk_timeout seconds */
3200         deadline = start + bulk_timeout;
3201         if (deadline > req->rq_deadline)
3202                 deadline = req->rq_deadline;
3203
3204         do {
3205                 long timeoutl = deadline - cfs_time_current_sec();
3206                 cfs_duration_t timeout = timeoutl <= 0 ?
3207                                          CFS_TICK : cfs_time_seconds(timeoutl);
3208                 time_t  rq_deadline;
3209
3210                 *lwi = LWI_TIMEOUT_INTERVAL(timeout, cfs_time_seconds(1),
3211                                             target_bulk_timeout, desc);
3212                 rc = l_wait_event(desc->bd_waitq,
3213                                   !ptlrpc_server_bulk_active(desc) ||
3214                                   exp->exp_failed ||
3215                                   exp->exp_conn_cnt >
3216                                   lustre_msg_get_conn_cnt(req->rq_reqmsg),
3217                                   lwi);
3218                 LASSERT(rc == 0 || rc == -ETIMEDOUT);
3219                 /* Wait again if we changed rq_deadline. */
3220                 rq_deadline = ACCESS_ONCE(req->rq_deadline);
3221                 deadline = start + bulk_timeout;
3222                 if (deadline > rq_deadline)
3223                         deadline = rq_deadline;
3224         } while ((rc == -ETIMEDOUT) &&
3225                  (deadline > cfs_time_current_sec()));
3226
3227         if (rc == -ETIMEDOUT) {
3228                 DEBUG_REQ(D_ERROR, req, "timeout on bulk %s after %ld%+lds",
3229                           bulk2type(req), deadline - start,
3230                           cfs_time_current_sec() - deadline);
3231                 ptlrpc_abort_bulk(desc);
3232         } else if (exp->exp_failed) {
3233                 DEBUG_REQ(D_ERROR, req, "Eviction on bulk %s",
3234                           bulk2type(req));
3235                 rc = -ENOTCONN;
3236                 ptlrpc_abort_bulk(desc);
3237         } else if (exp->exp_conn_cnt >
3238                    lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3239                 DEBUG_REQ(D_ERROR, req, "Reconnect on bulk %s",
3240                           bulk2type(req));
3241                 /* We don't reply anyway. */
3242                 rc = -ETIMEDOUT;
3243                 ptlrpc_abort_bulk(desc);
3244         } else if (desc->bd_failure) {
3245                 DEBUG_REQ(D_ERROR, req, "network error on bulk %s",
3246                           bulk2type(req));
3247                 /* XXX should this be a different errno? */
3248                 rc = -ETIMEDOUT;
3249         } else {
3250                 if (req->rq_bulk_write)
3251                         rc = sptlrpc_svc_unwrap_bulk(req, desc);
3252                 if (rc == 0 && desc->bd_nob_transferred != desc->bd_nob) {
3253                         DEBUG_REQ(D_ERROR, req, "truncated bulk %s %d(%d)",
3254                                   bulk2type(req), desc->bd_nob_transferred,
3255                                   desc->bd_nob);
3256                         /* XXX should this be a different errno? */
3257                         rc = -ETIMEDOUT;
3258                 }
3259         }
3260
3261         RETURN(rc);
3262 }
3263 EXPORT_SYMBOL(target_bulk_io);
3264
3265 #endif /* HAVE_SERVER_SUPPORT */