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_seq = NULL;
 354         init_rwsem(&cli->cl_seq_rwsem);
 355         cli->cl_conn_count = 0;
 356         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 357                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 358                      sizeof(server_uuid)));
 359
 360         cli->cl_dirty_pages = 0;
 361         cli->cl_avail_grant = 0;
 362         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
 363         /* cl_dirty_max_pages may be changed at connect time in
 364          * ptlrpc_connect_interpret(). */
 365         client_adjust_max_dirty(cli);
 366         INIT_LIST_HEAD(&cli->cl_cache_waiters);
 367         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 368         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 369         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 370         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 371         spin_lock_init(&cli->cl_loi_list_lock);
 372         atomic_set(&cli->cl_pending_w_pages, 0);
 373         atomic_set(&cli->cl_pending_r_pages, 0);
 374         cli->cl_r_in_flight = 0;
 375         cli->cl_w_in_flight = 0;
 376
 377         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 378         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 379         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 380         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 381         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 382         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 383
 384         /* lru for osc. */
 385         INIT_LIST_HEAD(&cli->cl_lru_osc);
 386         atomic_set(&cli->cl_lru_shrinkers, 0);
 387         atomic_long_set(&cli->cl_lru_busy, 0);
 388         atomic_long_set(&cli->cl_lru_in_list, 0);
 389         INIT_LIST_HEAD(&cli->cl_lru_list);
 390         spin_lock_init(&cli->cl_lru_list_lock);
 391         atomic_long_set(&cli->cl_unstable_count, 0);
 392         INIT_LIST_HEAD(&cli->cl_shrink_list);
 393
 394         INIT_LIST_HEAD(&cli->cl_flight_waiters);
 395         cli->cl_rpcs_in_flight = 0;
 396
 397         init_waitqueue_head(&cli->cl_destroy_waitq);
 398         atomic_set(&cli->cl_destroy_in_flight, 0);
 399 #ifdef ENABLE_CHECKSUM
 400         /* Turn on checksumming by default. */
 401         cli->cl_checksum = 1;
 402         /*
 403          * The supported checksum types will be worked out at connect time
 404          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 405          * through procfs.
 406          */
 407         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 408 #endif
 409         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 410
 411         /* Set it to possible maximum size. It may be reduced by ocd_brw_size
 412          * from OFD after connecting. */
 413         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 414
 415         /* set cl_chunkbits default value to PAGE_SHIFT,
 416          * it will be updated at OSC connection time. */
 417         cli->cl_chunkbits = PAGE_SHIFT;
 418
 419         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 420                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 421         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
 422                 cli->cl_max_rpcs_in_flight = 2;
 423         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
 424                 cli->cl_max_rpcs_in_flight = 3;
 425         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
 426                 cli->cl_max_rpcs_in_flight = 4;
 427         } else {
 428                 if (osc_on_mdt(obddev->obd_name))
 429                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
 430                 else
 431                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 432         }
 433
 434         spin_lock_init(&cli->cl_mod_rpcs_lock);
 435         spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
 436         cli->cl_max_mod_rpcs_in_flight = 0;
 437         cli->cl_mod_rpcs_in_flight = 0;
 438         cli->cl_close_rpcs_in_flight = 0;
 439         init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
 440         cli->cl_mod_tag_bitmap = NULL;
 441
 442         INIT_LIST_HEAD(&cli->cl_chg_dev_linkage);
 443
 444         if (connect_op == MDS_CONNECT) {
 445                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
 446                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
 447                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 448                 if (cli->cl_mod_tag_bitmap == NULL)
 449                         GOTO(err, rc = -ENOMEM);
 450         }
 451
 452         rc = ldlm_get_ref();
 453         if (rc) {
 454                 CERROR("ldlm_get_ref failed: %d\n", rc);
 455                 GOTO(err, rc);
 456         }
 457
 458         ptlrpc_init_client(rq_portal, rp_portal, name,
 459                            &obddev->obd_ldlm_client);
 460
 461         imp = class_new_import(obddev);
 462         if (imp == NULL)
 463                 GOTO(err_ldlm, rc = -ENOENT);
 464         imp->imp_client = &obddev->obd_ldlm_client;
 465         imp->imp_connect_op = connect_op;
 466         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 467                LUSTRE_CFG_BUFLEN(lcfg, 1));
 468         class_import_put(imp);
 469
 470         if (lustre_cfg_buf(lcfg, 4)) {
 471                 __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
 472
 473                 if (refnet == LNET_NIDNET(LNET_NID_ANY)) {
 474                         rc = -EINVAL;
 475                         CERROR("%s: bad mount option 'network=%s': rc = %d\n",
 476                                obddev->obd_name, lustre_cfg_string(lcfg, 4),
 477                                rc);
 478                         GOTO(err_import, rc);
 479                 }
 480                 fake_conn.c_self = LNET_MKNID(refnet, 0);
 481                 imp->imp_connection = &fake_conn;
 482         }
 483
 484         rc = client_import_add_conn(imp, &server_uuid, 1);
 485         if (rc) {
 486                 CERROR("can't add initial connection\n");
 487                 GOTO(err_import, rc);
 488         }
 489         imp->imp_connection = NULL;
 490
 491         cli->cl_import = imp;
 492         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
 493         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 494
 495         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 496                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 497                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 498                                name, obddev->obd_name,
 499                                cli->cl_target_uuid.uuid);
 500                         spin_lock(&imp->imp_lock);
 501                         imp->imp_deactive = 1;
 502                         spin_unlock(&imp->imp_lock);
 503                 }
 504         }
 505
 506         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 507                                                    LDLM_NAMESPACE_CLIENT,
 508                                                    LDLM_NAMESPACE_GREEDY,
 509                                                    ns_type);
 510         if (obddev->obd_namespace == NULL) {
 511                 CERROR("Unable to create client namespace - %s\n",
 512                        obddev->obd_name);
 513                 GOTO(err_import, rc = -ENOMEM);
 514         }
 515
 516         RETURN(rc);
 517
 518 err_import:
 519         class_destroy_import(imp);
 520 err_ldlm:
 521         ldlm_put_ref();
 522 err:
 523         if (cli->cl_mod_tag_bitmap != NULL)
 524                 OBD_FREE(cli->cl_mod_tag_bitmap,
 525                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 526         cli->cl_mod_tag_bitmap = NULL;
 527         RETURN(rc);
 528
 529 }
 530 EXPORT_SYMBOL(client_obd_setup);
 531
 532 int client_obd_cleanup(struct obd_device *obddev)
 533 {
 534         struct client_obd *cli = &obddev->u.cli;
 535         ENTRY;
 536
 537         ldlm_namespace_free_post(obddev->obd_namespace);
 538         obddev->obd_namespace = NULL;
 539
 540         obd_cleanup_client_import(obddev);
 541         LASSERT(obddev->u.cli.cl_import == NULL);
 542
 543         ldlm_put_ref();
 544
 545         if (cli->cl_mod_tag_bitmap != NULL)
 546                 OBD_FREE(cli->cl_mod_tag_bitmap,
 547                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 548         cli->cl_mod_tag_bitmap = NULL;
 549
 550         RETURN(0);
 551 }
 552 EXPORT_SYMBOL(client_obd_cleanup);
 553
 554 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 555 int client_connect_import(const struct lu_env *env,
 556                           struct obd_export **exp,
 557                           struct obd_device *obd, struct obd_uuid *cluuid,
 558                           struct obd_connect_data *data, void *localdata)
 559 {
 560         struct client_obd       *cli    = &obd->u.cli;
 561         struct obd_import       *imp    = cli->cl_import;
 562         struct obd_connect_data *ocd;
 563         struct lustre_handle    conn    = { 0 };
 564         int                     rc;
 565         ENTRY;
 566
 567         *exp = NULL;
 568         down_write(&cli->cl_sem);
 569         if (cli->cl_conn_count > 0)
 570                 GOTO(out_sem, rc = -EALREADY);
 571
 572         rc = class_connect(&conn, obd, cluuid);
 573         if (rc)
 574                 GOTO(out_sem, rc);
 575
 576         cli->cl_conn_count++;
 577         *exp = class_conn2export(&conn);
 578
 579         LASSERT(obd->obd_namespace);
 580
 581         imp->imp_dlm_handle = conn;
 582         rc = ptlrpc_init_import(imp);
 583         if (rc != 0)
 584                 GOTO(out_ldlm, rc);
 585
 586         ocd = &imp->imp_connect_data;
 587         if (data) {
 588                 *ocd = *data;
 589                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 590                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
 591         }
 592
 593         rc = ptlrpc_connect_import(imp);
 594         if (rc != 0) {
 595                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 596                 GOTO(out_ldlm, rc);
 597         }
 598         LASSERT(*exp != NULL && (*exp)->exp_connection);
 599
 600         if (data) {
 601                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 602                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 603                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 604                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 605                 data->ocd_connect_flags2 = ocd->ocd_connect_flags2;
 606         }
 607
 608         ptlrpc_pinger_add_import(imp);
 609
 610         EXIT;
 611
 612         if (rc) {
 613 out_ldlm:
 614                 cli->cl_conn_count--;
 615                 class_disconnect(*exp);
 616                 *exp = NULL;
 617         }
 618 out_sem:
 619         up_write(&cli->cl_sem);
 620
 621         return rc;
 622 }
 623 EXPORT_SYMBOL(client_connect_import);
 624
 625 int client_disconnect_export(struct obd_export *exp)
 626 {
 627         struct obd_device *obd = class_exp2obd(exp);
 628         struct client_obd *cli;
 629         struct obd_import *imp;
 630         int rc = 0, err;
 631         ENTRY;
 632
 633         if (!obd) {
 634                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 635                        exp, exp ? exp->exp_handle.h_cookie : -1);
 636                 RETURN(-EINVAL);
 637         }
 638
 639         cli = &obd->u.cli;
 640         imp = cli->cl_import;
 641
 642         down_write(&cli->cl_sem);
 643         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
 644                 cli->cl_conn_count);
 645
 646         if (cli->cl_conn_count == 0) {
 647                 CERROR("disconnecting disconnected device (%s)\n",
 648                        obd->obd_name);
 649                 GOTO(out_disconnect, rc = -EINVAL);
 650         }
 651
 652         cli->cl_conn_count--;
 653         if (cli->cl_conn_count != 0)
 654                 GOTO(out_disconnect, rc = 0);
 655
 656         /* Mark import deactivated now, so we don't try to reconnect if any
 657          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 658          * fully deactivate the import, or that would drop all requests. */
 659         spin_lock(&imp->imp_lock);
 660         imp->imp_deactive = 1;
 661         spin_unlock(&imp->imp_lock);
 662
 663         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 664          * delete it regardless.  (It's safe to delete an import that was
 665          * never added.) */
 666         (void)ptlrpc_pinger_del_import(imp);
 667
 668         if (obd->obd_namespace != NULL) {
 669                 /* obd_force == local only */
 670                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 671                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 672                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 673         }
 674
 675         /* There's no need to hold sem while disconnecting an import,
 676          * and it may actually cause deadlock in GSS. */
 677         up_write(&cli->cl_sem);
 678         rc = ptlrpc_disconnect_import(imp, 0);
 679         down_write(&cli->cl_sem);
 680
 681         ptlrpc_invalidate_import(imp);
 682
 683         EXIT;
 684
 685 out_disconnect:
 686         /* Use server style - class_disconnect should be always called for
 687          * o_disconnect. */
 688         err = class_disconnect(exp);
 689         if (!rc && err)
 690                 rc = err;
 691
 692         up_write(&cli->cl_sem);
 693
 694         RETURN(rc);
 695 }
 696 EXPORT_SYMBOL(client_disconnect_export);
 697
 698 #ifdef HAVE_SERVER_SUPPORT
 699 int server_disconnect_export(struct obd_export *exp)
 700 {
 701         int rc;
 702         ENTRY;
 703
 704         /* Disconnect early so that clients can't keep using export. */
 705         rc = class_disconnect(exp);
 706         /* Close import to avoid sending any requests. */
 707         if (exp->exp_imp_reverse)
 708                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 709
 710         ldlm_bl_thread_wakeup();
 711
 712         /* complete all outstanding replies */
 713         spin_lock(&exp->exp_lock);
 714         while (!list_empty(&exp->exp_outstanding_replies)) {
 715                 struct ptlrpc_reply_state *rs =
 716                         list_entry(exp->exp_outstanding_replies.next,
 717                                        struct ptlrpc_reply_state, rs_exp_list);
 718                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 719
 720                 spin_lock(&svcpt->scp_rep_lock);
 721
 722                 list_del_init(&rs->rs_exp_list);
 723
 724                 spin_lock(&rs->rs_lock);
 725                 /* clear rs_convert_lock to make sure rs is handled and put */
 726                 rs->rs_convert_lock = 0;
 727                 ptlrpc_schedule_difficult_reply(rs);
 728                 spin_unlock(&rs->rs_lock);
 729
 730                 spin_unlock(&svcpt->scp_rep_lock);
 731         }
 732         spin_unlock(&exp->exp_lock);
 733
 734         RETURN(rc);
 735 }
 736 EXPORT_SYMBOL(server_disconnect_export);
 737
 738 /* --------------------------------------------------------------------------
 739  * from old lib/target.c
 740  * -------------------------------------------------------------------------- */
 741
 742 static int target_handle_reconnect(struct lustre_handle *conn,
 743                                    struct obd_export *exp,
 744                                    struct obd_uuid *cluuid)
 745 {
 746         struct obd_device *target;
 747         struct lustre_handle *hdl;
 748         cfs_time_t now;
 749         cfs_time_t deadline;
 750         int timeout;
 751         int rc = 0;
 752         ENTRY;
 753
 754         hdl = &exp->exp_imp_reverse->imp_remote_handle;
 755         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
 756                 conn->cookie = exp->exp_handle.h_cookie;
 757                 CDEBUG(D_HA, "connect export for UUID '%s' at %p,"
 758                        " cookie %#llx\n", cluuid->uuid, exp, conn->cookie);
 759                 RETURN(0);
 760         }
 761
 762         target = exp->exp_obd;
 763
 764         /* Might be a re-connect after a partition. */
 765         if (memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 766                 LCONSOLE_WARN("%s: already connected client %s (at %s) "
 767                               "with handle %#llx. Rejecting client "
 768                               "with the same UUID trying to reconnect "
 769                               "with handle %#llx\n", target->obd_name,
 770                               obd_uuid2str(&exp->exp_client_uuid),
 771                               obd_export_nid2str(exp),
 772                               hdl->cookie, conn->cookie);
 773                 memset(conn, 0, sizeof *conn);
 774                 /* target_handle_connect() treats EALREADY and
 775                  * -EALREADY differently.  -EALREADY is an error
 776                  * (same UUID, different handle). */
 777                 RETURN(-EALREADY);
 778         }
 779
 780         if (!target->obd_recovering) {
 781                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
 782                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
 783                         obd_export_nid2str(exp));
 784                 GOTO(out_already, rc);
 785         }
 786
 787         now = cfs_time_current();
 788         deadline = target->obd_recovery_timer.expires;
 789         if (cfs_time_before(now, deadline)) {
 790                 struct target_distribute_txn_data *tdtd =
 791                                         class_exp2tgt(exp)->lut_tdtd;
 792                 int size = 0;
 793                 int count = 0;
 794                 char *buf = NULL;
 795
 796                 timeout = cfs_duration_sec(cfs_time_sub(deadline, now));
 797                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
 798                         buf = tdtd->tdtd_show_update_logs_retrievers(
 799                                 tdtd->tdtd_show_retrievers_cbdata,
 800                                 &size, &count);
 801
 802                 if (count > 0)
 803                         LCONSOLE_WARN("%s: Recovery already passed deadline "
 804                                       "%d:%.02d. It is due to DNE recovery "
 805                                       "failed/stuck on the %d MDT(s):%s. "
 806                                       "Please wait until all MDTs recovered "
 807                                       "or abort the recovery by force.\n",
 808                                       target->obd_name, timeout / 60,
 809                                       timeout % 60, count,
 810                                       buf ? buf : "unknown (not enough RAM)");
 811                 else
 812                         LCONSOLE_WARN("%s: Recovery already passed deadline "
 813                                       "%d:%.02d. If you do not want to wait "
 814                                       "more, please abort the recovery by "
 815                                       "force.\n", target->obd_name,
 816                                       timeout / 60, timeout % 60);
 817
 818                 if (buf != NULL)
 819                         OBD_FREE(buf, size);
 820         } else {
 821                 timeout = cfs_duration_sec(cfs_time_sub(now, deadline));
 822                 LCONSOLE_WARN("%s: Recovery already passed deadline"
 823                         " %d:%.02d, It is most likely due to DNE"
 824                         " recovery is failed or stuck, please wait a"
 825                         " few more minutes or abort the recovery.\n",
 826                         target->obd_name, timeout / 60, timeout % 60);
 827         }
 828
 829 out_already:
 830         conn->cookie = exp->exp_handle.h_cookie;
 831         /* target_handle_connect() treats EALREADY and
 832          * -EALREADY differently.  EALREADY means we are
 833          * doing a valid reconnect from the same client. */
 834         RETURN(EALREADY);
 835 }
 836
 837 static void
 838 check_and_start_recovery_timer(struct obd_device *obd,
 839                                struct ptlrpc_request *req, int new_client);
 840
 841 /**
 842  * update flags for import during reconnect process
 843  */
 844 static int rev_import_flags_update(struct obd_import *revimp,
 845                                    struct ptlrpc_request *req)
 846 {
 847         int rc;
 848         struct obd_connect_data *data;
 849
 850         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 851
 852         if (data->ocd_connect_flags & OBD_CONNECT_AT)
 853                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 854         else
 855                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 856
 857         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
 858
 859         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
 860         if (rc) {
 861                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
 862                         revimp->imp_client->cli_name,
 863                         libcfs_id2str(req->rq_peer), rc);
 864                 return rc;
 865         }
 866
 867         return 0;
 868 }
 869
 870 /**
 871  * Allocate a new reverse import for an export.
 872  *
 873  * \retval -errno in case error hit
 874  * \retval 0 if reverse import correctly init
 875  **/
 876 int rev_import_init(struct obd_export *export)
 877 {
 878         struct obd_device *obd = export->exp_obd;
 879         struct obd_import *revimp;
 880
 881         LASSERT(export->exp_imp_reverse == NULL);
 882
 883         revimp = class_new_import(obd);
 884         if (revimp == NULL)
 885                 return -ENOMEM;
 886
 887         revimp->imp_remote_handle.cookie = 0ULL;
 888         revimp->imp_client = &obd->obd_ldlm_client;
 889         revimp->imp_dlm_fake = 1;
 890
 891         /* it is safe to connect import in new state as no sends possible */
 892         spin_lock(&export->exp_lock);
 893         export->exp_imp_reverse = revimp;
 894         spin_unlock(&export->exp_lock);
 895         class_import_put(revimp);
 896
 897         return 0;
 898 }
 899 EXPORT_SYMBOL(rev_import_init);
 900
 901 /**
 902  * Handle reconnect for an export.
 903  *
 904  * \param exp export to handle reconnect process
 905  * \param req client reconnect request
 906  *
 907  * \retval -rc in case securitfy flavor can't be changed
 908  * \retval 0 in case none problems
 909  */
 910 static int rev_import_reconnect(struct obd_export *exp,
 911                                 struct ptlrpc_request *req)
 912 {
 913         struct obd_import *revimp = exp->exp_imp_reverse;
 914         struct lustre_handle *lh;
 915         int rc;
 916
 917         /* avoid sending a request until import flags are changed */
 918         ptlrpc_import_enter_resend(revimp);
 919
 920         if (revimp->imp_connection != NULL)
 921                 ptlrpc_connection_put(revimp->imp_connection);
 922
 923         /*
 924          * client from recovery don't have a handle so we need to take from
 925          * request. it may produce situation when wrong client connected
 926          * to recovery as we trust a client uuid
 927          */
 928         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 929         revimp->imp_remote_handle = *lh;
 930
 931         /* unknown versions will be caught in
 932          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
 933         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
 934
 935         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
 936
 937         rc = rev_import_flags_update(revimp, req);
 938         if (rc != 0) {
 939                 /* it is safe to still be in RECOVERY phase as we are not able
 940                  * to setup correct security flavor so requests are not able to
 941                  * be delivered correctly */
 942                 return rc;
 943         }
 944
 945         /* resend all rpc's via new connection */
 946         return ptlrpc_import_recovery_state_machine(revimp);
 947 }
 948
 949 int target_handle_connect(struct ptlrpc_request *req)
 950 {
 951         struct obd_device *target = NULL;
 952         struct obd_export *export = NULL;
 953         /* connect handle - filled from target_handle_reconnect in
 954          * reconnect case */
 955         struct lustre_handle conn;
 956         struct lustre_handle *tmp;
 957         struct obd_uuid tgtuuid;
 958         struct obd_uuid cluuid;
 959         char *str;
 960         int rc = 0;
 961         char *target_start;
 962         int target_len;
 963         bool     mds_conn = false, lw_client = false, initial_conn = false;
 964         bool     mds_mds_conn = false;
 965         bool     new_mds_mds_conn = false;
 966         bool     target_referenced = false;
 967         struct obd_connect_data *data, *tmpdata;
 968         int size, tmpsize;
 969         lnet_nid_t *client_nid = NULL;
 970         ENTRY;
 971
 972         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 973
 974         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 975         if (str == NULL) {
 976                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 977                 GOTO(out, rc = -EINVAL);
 978         }
 979
 980         obd_str2uuid(&tgtuuid, str);
 981         target = class_uuid2obd(&tgtuuid);
 982         if (!target)
 983                 target = class_name2obd(str);
 984
 985         if (!target) {
 986                 deuuidify(str, NULL, &target_start, &target_len);
 987                 LCONSOLE_ERROR_MSG(0x137, "%s: not available for connect "
 988                                    "from %s (no target). If you are running "
 989                                    "an HA pair check that the target is "
 990                                    "mounted on the other server.\n", str,
 991                                    libcfs_nid2str(req->rq_peer.nid));
 992                 GOTO(out, rc = -ENODEV);
 993         }
 994
 995         spin_lock(&target->obd_dev_lock);
 996         if (target->obd_stopping || !target->obd_set_up) {
 997                 spin_unlock(&target->obd_dev_lock);
 998
 999                 deuuidify(str, NULL, &target_start, &target_len);
1000                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
1001                               target_len, target_start,
1002                               libcfs_nid2str(req->rq_peer.nid),
1003                               (target->obd_stopping ?
1004                                "stopping" : "not set up"));
1005                 GOTO(out, rc = -ENODEV);
1006         }
1007
1008         if (target->obd_no_conn) {
1009                 spin_unlock(&target->obd_dev_lock);
1010
1011                 CDEBUG(D_INFO, "%s: Temporarily refusing client connection "
1012                                "from %s\n", target->obd_name,
1013                                libcfs_nid2str(req->rq_peer.nid));
1014                 GOTO(out, rc = -EAGAIN);
1015         }
1016
1017         /* Make sure the target isn't cleaned up while we're here. Yes,
1018          * there's still a race between the above check and our incref here.
1019          * Really, class_uuid2obd should take the ref. */
1020         class_incref(target, __func__, current);
1021         target_referenced = true;
1022
1023         target->obd_conn_inprogress++;
1024         spin_unlock(&target->obd_dev_lock);
1025
1026         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1027         if (str == NULL) {
1028                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1029                 GOTO(out, rc = -EINVAL);
1030         }
1031
1032         obd_str2uuid(&cluuid, str);
1033
1034         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1035         if (tmp == NULL)
1036                 GOTO(out, rc = -EPROTO);
1037
1038         conn = *tmp;
1039
1040         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1041                                     RCL_CLIENT);
1042         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1043         if (!data)
1044                 GOTO(out, rc = -EPROTO);
1045
1046         rc = req_capsule_server_pack(&req->rq_pill);
1047         if (rc)
1048                 GOTO(out, rc);
1049
1050 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1051         /* Don't allow clients to connect that are using old 1.8 format
1052          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1053          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1054          * FULL20 flag should be set on all connections since 2.0, but no
1055          * longer affects behaviour.
1056          *
1057          * Later this check will be disabled and the flag can be retired
1058          * completely once interop with 3.0 is no longer needed.
1059          */
1060         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1061                 GOTO(out, rc = -EPROTO);
1062 #endif
1063
1064         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1065                 if (data->ocd_version < LUSTRE_VERSION_CODE -
1066                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
1067                     data->ocd_version > LUSTRE_VERSION_CODE +
1068                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
1069                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
1070                                   "libclient connection attempt",
1071                                   data->ocd_version < LUSTRE_VERSION_CODE ?
1072                                   "old" : "new",
1073                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
1074                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
1075                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
1076                                   OBD_OCD_VERSION_FIX(data->ocd_version));
1077                         data = req_capsule_server_sized_get(&req->rq_pill,
1078                                                             &RMF_CONNECT_DATA,
1079                                     offsetof(typeof(*data), ocd_version) +
1080                                              sizeof(data->ocd_version));
1081                         if (data) {
1082                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
1083                                 data->ocd_version = LUSTRE_VERSION_CODE;
1084                         }
1085                         GOTO(out, rc = -EPROTO);
1086                 }
1087         }
1088
1089         /* Note: lw_client is needed in MDS-MDS failover during update log
1090          * processing, so we needs to allow lw_client to be connected at
1091          * anytime, instead of only the initial connection */
1092         lw_client = (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0;
1093
1094         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1095                 initial_conn = true;
1096                 mds_conn = (data->ocd_connect_flags & OBD_CONNECT_MDS) != 0;
1097                 mds_mds_conn = (data->ocd_connect_flags &
1098                                 OBD_CONNECT_MDS_MDS) != 0;
1099
1100                 /* OBD_CONNECT_MNE_SWAB is defined as OBD_CONNECT_MDS_MDS
1101                  * for Imperative Recovery connection from MGC to MGS.
1102                  *
1103                  * Via check OBD_CONNECT_FID, we can distinguish whether
1104                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1105                  * MGC or MDT. */
1106                 if (!lw_client &&
1107                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1108                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1109                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1110                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1111                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1112                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1113
1114                         /* We do not support the MDT-MDT interoperations with
1115                          * different version MDT because of protocol changes. */
1116                         if (unlikely(major != LUSTRE_MAJOR ||
1117                                      minor != LUSTRE_MINOR ||
1118                                      abs(patch - LUSTRE_PATCH) > 3)) {
1119                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the "
1120                                         "connection from different version MDT "
1121                                         "(%d.%d.%d.%d) %s %s\n",
1122                                         target->obd_name, LUSTRE_MAJOR,
1123                                         LUSTRE_MINOR, LUSTRE_PATCH, LUSTRE_FIX,
1124                                         major, minor, patch,
1125                                         OBD_OCD_VERSION_FIX(data->ocd_version),
1126                                         libcfs_nid2str(req->rq_peer.nid), str);
1127
1128                                 GOTO(out, rc = -EPROTO);
1129                         }
1130                 }
1131         }
1132
1133         /* lctl gets a backstage, all-access pass. */
1134         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1135                 goto dont_check_exports;
1136
1137         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
1138         if (!export)
1139                 goto no_export;
1140
1141         /* We've found an export in the hash. */
1142
1143         spin_lock(&export->exp_lock);
1144
1145         if (export->exp_connecting) { /* bug 9635, et. al. */
1146                 spin_unlock(&export->exp_lock);
1147                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1148                               export->exp_obd->obd_name, export,
1149                               libcfs_nid2str(req->rq_peer.nid));
1150                 class_export_put(export);
1151                 export = NULL;
1152                 rc = -EALREADY;
1153         } else if ((mds_conn || (lw_client && initial_conn) ||
1154                    data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1155                    export->exp_connection != NULL) {
1156                 spin_unlock(&export->exp_lock);
1157                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1158                         /* MDS or LWP reconnected after failover. */
1159                         LCONSOLE_WARN("%s: Received %s connection from "
1160                             "%s, removing former export from %s\n",
1161                             target->obd_name, mds_conn ? "MDS" : "LWP",
1162                             libcfs_nid2str(req->rq_peer.nid),
1163                             libcfs_nid2str(export->exp_connection->c_peer.nid));
1164                 } else {
1165                         /* New MDS connection from the same NID. */
1166                         LCONSOLE_WARN("%s: Received new %s connection from "
1167                                 "%s, removing former export from same NID\n",
1168                                 target->obd_name, mds_conn ? "MDS" : "LWP",
1169                                 libcfs_nid2str(req->rq_peer.nid));
1170                 }
1171
1172                 if (req->rq_peer.nid == export->exp_connection->c_peer.nid &&
1173                     data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
1174                         /* Because exports between MDTs will always be
1175                          * kept, let's do not fail such export if they
1176                          * come from the same NID, otherwise it might
1177                          * cause eviction between MDTs, which might
1178                          * cause namespace inconsistency */
1179                         spin_lock(&export->exp_lock);
1180                         export->exp_connecting = 1;
1181                         spin_unlock(&export->exp_lock);
1182                         conn.cookie = export->exp_handle.h_cookie;
1183                         rc = EALREADY;
1184                 } else {
1185                         class_fail_export(export);
1186                         class_export_put(export);
1187                         export = NULL;
1188                         rc = 0;
1189                 }
1190         } else if (export->exp_connection != NULL && initial_conn &&
1191                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1192                 spin_unlock(&export->exp_lock);
1193                 /* In MDS failover we have static UUID but NID can change. */
1194                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when "
1195                               "existing nid %s is already connected\n",
1196                               target->obd_name, cluuid.uuid,
1197                               libcfs_nid2str(req->rq_peer.nid),
1198                               libcfs_nid2str(
1199                                       export->exp_connection->c_peer.nid));
1200                 rc = -EALREADY;
1201                 class_export_put(export);
1202                 export = NULL;
1203         } else {
1204                 export->exp_connecting = 1;
1205                 spin_unlock(&export->exp_lock);
1206                 LASSERT(export->exp_obd == target);
1207
1208                 rc = target_handle_reconnect(&conn, export, &cluuid);
1209         }
1210
1211         /* If we found an export, we already unlocked. */
1212         if (!export) {
1213 no_export:
1214                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1215         } else if (req->rq_export == NULL &&
1216                    atomic_read(&export->exp_rpc_count) > 0) {
1217                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, "
1218                               "still busy with %d references\n",
1219                               target->obd_name, cluuid.uuid,
1220                               libcfs_nid2str(req->rq_peer.nid),
1221                               atomic_read(&export->exp_refcount));
1222                 GOTO(out, rc = -EBUSY);
1223         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
1224                 if (!strstr(cluuid.uuid, "mdt"))
1225                         LCONSOLE_WARN("%s: Rejecting reconnect from the "
1226                                       "known client %s (at %s) because it "
1227                                       "is indicating it is a new client",
1228                                       target->obd_name, cluuid.uuid,
1229                                       libcfs_nid2str(req->rq_peer.nid));
1230                 GOTO(out, rc = -EALREADY);
1231         } else {
1232                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1233         }
1234
1235         if (rc < 0) {
1236                 GOTO(out, rc);
1237         }
1238
1239         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %ld last %ld\n",
1240                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1241               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1242               export, (long)cfs_time_current_sec(),
1243               export ? (long)export->exp_last_request_time : 0);
1244
1245         /* If this is the first time a client connects, reset the recovery
1246          * timer. Discard lightweight connections which might be local. */
1247         if (!lw_client && rc == 0 && target->obd_recovering)
1248                 check_and_start_recovery_timer(target, req, export == NULL);
1249
1250         /* We want to handle EALREADY but *not* -EALREADY from
1251          * target_handle_reconnect(), return reconnection state in a flag. */
1252         if (rc == EALREADY) {
1253                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1254                 rc = 0;
1255         } else {
1256                 LASSERT(rc == 0);
1257         }
1258
1259         /* Tell the client if we support replayable requests. */
1260         if (target->obd_replayable)
1261                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1262         client_nid = &req->rq_peer.nid;
1263
1264         if (export == NULL) {
1265                 /* allow lightweight connections during recovery */
1266                 /* allow "new" MDT to be connected during recovery, since we
1267                  * need retrieve recovery update records from it */
1268                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1269                         cfs_time_t t;
1270                         int     c; /* connected */
1271                         int     i; /* in progress */
1272                         int     k; /* known */
1273                         int     s; /* stale/evicted */
1274
1275                         c = atomic_read(&target->obd_connected_clients);
1276                         i = atomic_read(&target->obd_lock_replay_clients);
1277                         k = target->obd_max_recoverable_clients;
1278                         s = target->obd_stale_clients;
1279                         t = target->obd_recovery_timer.expires;
1280                         t = cfs_time_sub(t, cfs_time_current());
1281                         t = cfs_duration_sec(t);
1282                         LCONSOLE_WARN("%s: Denying connection for new client %s"
1283                                       "(at %s), waiting for %d known clients "
1284                                       "(%d recovered, %d in progress, and %d "
1285                                       "evicted) to recover in %d:%.02d\n",
1286                                       target->obd_name, cluuid.uuid,
1287                                       libcfs_nid2str(req->rq_peer.nid), k,
1288                                       c - i, i, s, (int)t / 60,
1289                                       (int)t % 60);
1290                         rc = -EBUSY;
1291                 } else {
1292 dont_check_exports:
1293                         rc = obd_connect(req->rq_svc_thread->t_env,
1294                                          &export, target, &cluuid, data,
1295                                          client_nid);
1296                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1297                                 lustre_msg_add_op_flags(req->rq_repmsg,
1298                                                         MSG_CONNECT_RECOVERING);
1299                         if (rc == 0) {
1300                                 conn.cookie = export->exp_handle.h_cookie;
1301                                 rc = rev_import_init(export);
1302                         }
1303
1304                         if (mds_mds_conn)
1305                                 new_mds_mds_conn = true;
1306                 }
1307         } else {
1308                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1309                                    export, target, &cluuid, data, client_nid);
1310         }
1311         if (rc)
1312                 GOTO(out, rc);
1313
1314         LASSERT(target->u.obt.obt_magic == OBT_MAGIC);
1315         data->ocd_instance = target->u.obt.obt_instance;
1316
1317         /* Return only the parts of obd_connect_data that we understand, so the
1318          * client knows that we don't understand the rest. */
1319         if (data) {
1320                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1321                                                RCL_SERVER);
1322                 tmpdata = req_capsule_server_get(&req->rq_pill,
1323                                                  &RMF_CONNECT_DATA);
1324                 /* Don't use struct assignment here, because the client reply
1325                  * buffer may be smaller/larger than the local struct
1326                  * obd_connect_data. */
1327                 memcpy(tmpdata, data, min(tmpsize, size));
1328         }
1329
1330         /* If the client and the server are the same node, we will already
1331          * have an export that really points to the client's DLM export,
1332          * because we have a shared handles table.
1333          *
1334          * XXX this will go away when shaver stops sending the "connect" handle
1335          * in the real "remote handle" field of the request --phik 24 Apr 2003
1336          */
1337         ptlrpc_request_change_export(req, export);
1338
1339         spin_lock(&export->exp_lock);
1340         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1341                 spin_unlock(&export->exp_lock);
1342                 CDEBUG(D_RPCTRACE, "%s: %s already connected at greater "
1343                        "or equal conn_cnt: %d >= %d\n",
1344                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1345                        export->exp_conn_cnt,
1346                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1347
1348                 GOTO(out, rc = -EALREADY);
1349         }
1350         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1351         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1352
1353         /* Don't evict liblustre clients for not pinging. */
1354         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1355                 export->exp_libclient = 1;
1356                 spin_unlock(&export->exp_lock);
1357
1358                 spin_lock(&target->obd_dev_lock);
1359                 list_del_init(&export->exp_obd_chain_timed);
1360                 spin_unlock(&target->obd_dev_lock);
1361         } else {
1362                 spin_unlock(&export->exp_lock);
1363         }
1364
1365         if (export->exp_connection != NULL) {
1366                 /* Check to see if connection came from another NID. */
1367                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
1368                     !hlist_unhashed(&export->exp_nid_hash))
1369                         cfs_hash_del(export->exp_obd->obd_nid_hash,
1370                                      &export->exp_connection->c_peer.nid,
1371                                      &export->exp_nid_hash);
1372
1373                 ptlrpc_connection_put(export->exp_connection);
1374         }
1375
1376         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
1377                                                        req->rq_self,
1378                                                        &cluuid);
1379         if (hlist_unhashed(&export->exp_nid_hash))
1380                 cfs_hash_add(export->exp_obd->obd_nid_hash,
1381                              &export->exp_connection->c_peer.nid,
1382                              &export->exp_nid_hash);
1383
1384         lustre_msg_set_handle(req->rq_repmsg, &conn);
1385
1386         rc = rev_import_reconnect(export, req);
1387         if (rc != 0)
1388                 GOTO(out, rc);
1389
1390         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1391                 int has_transno;
1392                 __u64 transno = data->ocd_transno;
1393
1394                 spin_lock(&export->exp_lock);
1395                 /* possible race with class_disconnect_stale_exports,
1396                  * export may be already in the eviction process */
1397                 if (export->exp_failed) {
1398                         spin_unlock(&export->exp_lock);
1399                         GOTO(out, rc = -ENODEV);
1400                 }
1401                 export->exp_in_recovery = 1;
1402                 export->exp_req_replay_needed = 1;
1403                 export->exp_lock_replay_needed = 1;
1404                 spin_unlock(&export->exp_lock);
1405
1406                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1407                                  MSG_CONNECT_TRANSNO);
1408                 if (has_transno && transno == 0)
1409                         CWARN("Connect with zero transno!\n");
1410
1411                 if (has_transno && transno > 0 &&
1412                     transno < target->obd_next_recovery_transno &&
1413                     transno > target->obd_last_committed) {
1414                         /* Another way is to use cmpxchg() to be lock-free. */
1415                         spin_lock(&target->obd_recovery_task_lock);
1416                         if (transno < target->obd_next_recovery_transno)
1417                                 target->obd_next_recovery_transno = transno;
1418                         spin_unlock(&target->obd_recovery_task_lock);
1419                 }
1420
1421                 atomic_inc(&target->obd_req_replay_clients);
1422                 atomic_inc(&target->obd_lock_replay_clients);
1423                 /* Note: MDS-MDS connection is allowed to be connected during
1424                  * recovery, no matter if the exports needs to be recoveried.
1425                  * Because we need retrieve updates logs from all other MDTs.
1426                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1427                  * also needs to be increased to match other recovery checking
1428                  * condition. */
1429                 if (new_mds_mds_conn)
1430                         target->obd_max_recoverable_clients++;
1431                 if (atomic_inc_return(&target->obd_connected_clients) ==
1432                     target->obd_max_recoverable_clients)
1433                         wake_up(&target->obd_next_transno_waitq);
1434         }
1435
1436         /* Tell the client we're in recovery, when client is involved in it. */
1437         if (target->obd_recovering && !lw_client)
1438                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1439
1440 out:
1441         if (export) {
1442                 spin_lock(&export->exp_lock);
1443                 export->exp_connecting = 0;
1444                 spin_unlock(&export->exp_lock);
1445
1446                 class_export_put(export);
1447         }
1448         if (target_referenced == true && target != NULL) {
1449                 spin_lock(&target->obd_dev_lock);
1450                 target->obd_conn_inprogress--;
1451                 spin_unlock(&target->obd_dev_lock);
1452
1453                 class_decref(target, __func__, current);
1454         }
1455         req->rq_status = rc;
1456         RETURN(rc);
1457 }
1458
1459 int target_handle_disconnect(struct ptlrpc_request *req)
1460 {
1461         int rc;
1462         ENTRY;
1463
1464         rc = req_capsule_server_pack(&req->rq_pill);
1465         if (rc)
1466                 RETURN(rc);
1467
1468         /* Keep the rq_export around so we can send the reply. */
1469         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1470
1471         RETURN(0);
1472 }
1473
1474 void target_destroy_export(struct obd_export *exp)
1475 {
1476         struct obd_import       *imp = NULL;
1477         /* exports created from last_rcvd data, and "fake"
1478            exports created by lctl don't have an import */
1479         spin_lock(&exp->exp_lock);
1480         if (exp->exp_imp_reverse != NULL) {
1481                 imp = exp->exp_imp_reverse;
1482                 exp->exp_imp_reverse = NULL;
1483         }
1484         spin_unlock(&exp->exp_lock);
1485         if (imp != NULL)
1486                 client_destroy_import(imp);
1487
1488         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1489         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1490         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1491         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1492 }
1493 EXPORT_SYMBOL(target_destroy_export);
1494
1495 /*
1496  * Recovery functions
1497  */
1498 static void target_request_copy_get(struct ptlrpc_request *req)
1499 {
1500         class_export_rpc_inc(req->rq_export);
1501         LASSERT(list_empty(&req->rq_list));
1502         INIT_LIST_HEAD(&req->rq_replay_list);
1503
1504         /* Increase refcount to keep request in queue. */
1505         atomic_inc(&req->rq_refcount);
1506         /* Let export know it has replays to be handled. */
1507         atomic_inc(&req->rq_export->exp_replay_count);
1508 }
1509
1510 static void target_request_copy_put(struct ptlrpc_request *req)
1511 {
1512         LASSERT(list_empty(&req->rq_replay_list));
1513         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1514
1515         atomic_dec(&req->rq_export->exp_replay_count);
1516         class_export_rpc_dec(req->rq_export);
1517         ptlrpc_server_drop_request(req);
1518 }
1519
1520 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1521 {
1522         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1523         struct obd_export     *exp = req->rq_export;
1524         struct ptlrpc_request *reqiter;
1525         struct ptlrpc_request *dup_req = NULL;
1526         int                    dup = 0;
1527
1528         LASSERT(exp);
1529
1530         spin_lock(&exp->exp_lock);
1531         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1532                                 rq_replay_list) {
1533                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1534                         dup_req = reqiter;
1535                         dup = 1;
1536                         break;
1537                 }
1538         }
1539
1540         if (dup) {
1541                 /* We expect it with RESENT and REPLAY flags. */
1542                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1543                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1544                         CERROR("invalid flags %x of resent replay\n",
1545                                lustre_msg_get_flags(req->rq_reqmsg));
1546
1547                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1548                         __u32 new_conn;
1549
1550                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1551                         if (new_conn >
1552                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1553                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1554                                                         new_conn);
1555                 }
1556         } else {
1557                 list_add_tail(&req->rq_replay_list,
1558                                   &exp->exp_req_replay_queue);
1559         }
1560
1561         spin_unlock(&exp->exp_lock);
1562         return dup;
1563 }
1564
1565 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1566 {
1567         LASSERT(!list_empty(&req->rq_replay_list));
1568         LASSERT(req->rq_export);
1569
1570         spin_lock(&req->rq_export->exp_lock);
1571         list_del_init(&req->rq_replay_list);
1572         spin_unlock(&req->rq_export->exp_lock);
1573 }
1574
1575 static void target_finish_recovery(struct lu_target *lut)
1576 {
1577         struct obd_device *obd = lut->lut_obd;
1578         ENTRY;
1579
1580         /* Only log a recovery message when recovery has occurred. */
1581         if (obd->obd_recovery_start) {
1582                 time64_t now = ktime_get_real_seconds();
1583                 time64_t elapsed_time;
1584
1585                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start, 1);
1586                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients "
1587                         "%d recovered and %d %s evicted.\n", obd->obd_name,
1588                         (s64)elapsed_time / 60, (s64)elapsed_time % 60,
1589                         obd->obd_max_recoverable_clients,
1590                         atomic_read(&obd->obd_connected_clients),
1591                         obd->obd_stale_clients,
1592                         obd->obd_stale_clients == 1 ? "was" : "were");
1593         }
1594
1595         ldlm_reprocess_recovery_done(obd->obd_namespace);
1596         spin_lock(&obd->obd_recovery_task_lock);
1597         if (!list_empty(&obd->obd_req_replay_queue) ||
1598             !list_empty(&obd->obd_lock_replay_queue) ||
1599             !list_empty(&obd->obd_final_req_queue)) {
1600                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1601                        obd->obd_name,
1602                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1603                        list_empty(&obd->obd_lock_replay_queue) ? \
1604                                "" : "lock ",
1605                        list_empty(&obd->obd_final_req_queue) ? \
1606                                "" : "final ");
1607                 spin_unlock(&obd->obd_recovery_task_lock);
1608                 LBUG();
1609         }
1610         spin_unlock(&obd->obd_recovery_task_lock);
1611
1612         obd->obd_recovery_end = ktime_get_real_seconds();
1613
1614         /* When recovery finished, cleanup orphans on MDS and OST. */
1615         if (OBT(obd) && OBP(obd, postrecov)) {
1616                 int rc = OBP(obd, postrecov)(obd);
1617                 if (rc < 0)
1618                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1619                                       obd->obd_name, rc);
1620         }
1621         EXIT;
1622 }
1623
1624 static void abort_req_replay_queue(struct obd_device *obd)
1625 {
1626         struct ptlrpc_request *req, *n;
1627         struct list_head abort_list;
1628
1629         INIT_LIST_HEAD(&abort_list);
1630         spin_lock(&obd->obd_recovery_task_lock);
1631         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1632         spin_unlock(&obd->obd_recovery_task_lock);
1633         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1634                 DEBUG_REQ(D_WARNING, req, "aborted:");
1635                 req->rq_status = -ENOTCONN;
1636                 if (ptlrpc_error(req)) {
1637                         DEBUG_REQ(D_ERROR, req,
1638                                   "failed abort_req_reply; skipping");
1639                 }
1640                 target_exp_dequeue_req_replay(req);
1641                 target_request_copy_put(req);
1642         }
1643 }
1644
1645 static void abort_lock_replay_queue(struct obd_device *obd)
1646 {
1647         struct ptlrpc_request *req, *n;
1648         struct list_head abort_list;
1649
1650         INIT_LIST_HEAD(&abort_list);
1651         spin_lock(&obd->obd_recovery_task_lock);
1652         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1653         spin_unlock(&obd->obd_recovery_task_lock);
1654         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1655                 DEBUG_REQ(D_ERROR, req, "aborted:");
1656                 req->rq_status = -ENOTCONN;
1657                 if (ptlrpc_error(req)) {
1658                         DEBUG_REQ(D_ERROR, req,
1659                                   "failed abort_lock_reply; skipping");
1660                 }
1661                 target_request_copy_put(req);
1662         }
1663 }
1664
1665 /* Called from a cleanup function if the device is being cleaned up
1666    forcefully.  The exports should all have been disconnected already,
1667    the only thing left to do is
1668      - clear the recovery flags
1669      - cancel the timer
1670      - free queued requests and replies, but don't send replies
1671    Because the obd_stopping flag is set, no new requests should be received.
1672
1673 */
1674 void target_cleanup_recovery(struct obd_device *obd)
1675 {
1676         struct ptlrpc_request *req, *n;
1677         struct list_head clean_list;
1678
1679         INIT_LIST_HEAD(&clean_list);
1680         spin_lock(&obd->obd_dev_lock);
1681         if (!obd->obd_recovering) {
1682                 spin_unlock(&obd->obd_dev_lock);
1683                 EXIT;
1684                 return;
1685         }
1686         obd->obd_recovering = obd->obd_abort_recovery = 0;
1687         spin_unlock(&obd->obd_dev_lock);
1688
1689         spin_lock(&obd->obd_recovery_task_lock);
1690         target_cancel_recovery_timer(obd);
1691         list_splice_init(&obd->obd_req_replay_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_exp_dequeue_req_replay(req);
1697                 target_request_copy_put(req);
1698         }
1699
1700         spin_lock(&obd->obd_recovery_task_lock);
1701         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1702         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1703         spin_unlock(&obd->obd_recovery_task_lock);
1704
1705         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1706                 LASSERT(req->rq_reply_state == NULL);
1707                 target_request_copy_put(req);
1708         }
1709
1710         EXIT;
1711 }
1712 EXPORT_SYMBOL(target_cleanup_recovery);
1713
1714 /* obd_recovery_task_lock should be held */
1715 void target_cancel_recovery_timer(struct obd_device *obd)
1716 {
1717         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1718         del_timer(&obd->obd_recovery_timer);
1719 }
1720
1721 static void target_start_recovery_timer(struct obd_device *obd)
1722 {
1723         if (obd->obd_recovery_start != 0)
1724                 return;
1725
1726         spin_lock(&obd->obd_dev_lock);
1727         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1728                 spin_unlock(&obd->obd_dev_lock);
1729                 return;
1730         }
1731
1732         LASSERT(obd->obd_recovery_timeout != 0);
1733
1734         if (obd->obd_recovery_start != 0) {
1735                 spin_unlock(&obd->obd_dev_lock);
1736                 return;
1737         }
1738
1739         mod_timer(&obd->obd_recovery_timer,
1740                   cfs_time_shift(obd->obd_recovery_timeout));
1741         obd->obd_recovery_start = ktime_get_real_seconds();
1742         spin_unlock(&obd->obd_dev_lock);
1743
1744         LCONSOLE_WARN("%s: Will be in recovery for at least %llu:%02llu, or until %d client%s reconnect%s\n",
1745                       obd->obd_name,
1746                       obd->obd_recovery_timeout / 60,
1747                       obd->obd_recovery_timeout % 60,
1748                       obd->obd_max_recoverable_clients,
1749                       (obd->obd_max_recoverable_clients == 1) ? "" : "s",
1750                       (obd->obd_max_recoverable_clients == 1) ? "s": "");
1751 }
1752
1753 /**
1754  * extend recovery window.
1755  *
1756  * if @extend is true, extend recovery window to have @drt remaining at least;
1757  * otherwise, make sure the recovery timeout value is not less than @drt.
1758  */
1759 static void extend_recovery_timer(struct obd_device *obd, int drt,
1760                                   bool extend)
1761 {
1762         time64_t now;
1763         time64_t end;
1764         time64_t left;
1765         time64_t to;
1766
1767         spin_lock(&obd->obd_dev_lock);
1768         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1769                 spin_unlock(&obd->obd_dev_lock);
1770                 return;
1771         }
1772         LASSERT(obd->obd_recovery_start != 0);
1773
1774         now = ktime_get_real_seconds();
1775         to = obd->obd_recovery_timeout;
1776         end = obd->obd_recovery_start + to;
1777         left = end - now;
1778
1779         if (extend && (drt > left)) {
1780                 to += drt - left;
1781         } else if (!extend && (drt > to)) {
1782                 to = drt;
1783         }
1784
1785         if (to > obd->obd_recovery_time_hard) {
1786                 to = obd->obd_recovery_time_hard;
1787                 CWARN("%s: extended recovery timer reaching hard limit: %lld, extend: %d\n",
1788                       obd->obd_name, to, extend);
1789         }
1790
1791         if (obd->obd_recovery_timeout < to) {
1792                 obd->obd_recovery_timeout = to;
1793                 end = obd->obd_recovery_start + to;
1794                 mod_timer(&obd->obd_recovery_timer,
1795                           cfs_time_shift(end - now));
1796         }
1797         spin_unlock(&obd->obd_dev_lock);
1798
1799         CDEBUG(D_HA, "%s: recovery timer will expire in %lld seconds\n",
1800                 obd->obd_name, (s64)(end - now));
1801 }
1802
1803 /* Reset the timer with each new client connection */
1804 /*
1805  * This timer is actually reconnect_timer, which is for making sure
1806  * the total recovery window is at least as big as my reconnect
1807  * attempt timing. So the initial recovery time_out will be set to
1808  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1809  * from client is bigger than this, then the recovery time_out will
1810  * be extended to make sure the client could be reconnected, in the
1811  * process, the timeout from the new client should be ignored.
1812  */
1813
1814 static void
1815 check_and_start_recovery_timer(struct obd_device *obd,
1816                                struct ptlrpc_request *req,
1817                                int new_client)
1818 {
1819         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1820         struct obd_device_target *obt = &obd->u.obt;
1821
1822         if (!new_client && service_time)
1823                 /* Teach server about old server's estimates, as first guess
1824                  * at how long new requests will take. */
1825                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
1826                             service_time);
1827
1828         target_start_recovery_timer(obd);
1829
1830         /* Convert the service time to RPC timeout,
1831          * and reuse service_time to limit stack usage. */
1832         service_time = at_est2timeout(service_time);
1833
1834         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
1835             service_time < at_extra)
1836                 service_time = at_extra;
1837
1838         /* We expect other clients to timeout within service_time, then try
1839          * to reconnect, then try the failover server.  The max delay between
1840          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL. */
1841         service_time += 2 * INITIAL_CONNECT_TIMEOUT;
1842
1843         LASSERT(obt->obt_magic == OBT_MAGIC);
1844         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
1845         if (service_time > obd->obd_recovery_timeout && !new_client)
1846                 extend_recovery_timer(obd, service_time, false);
1847 }
1848
1849 /** Health checking routines */
1850 static inline int exp_connect_healthy(struct obd_export *exp)
1851 {
1852         return (exp->exp_in_recovery);
1853 }
1854
1855 /** if export done req_replay or has replay in queue */
1856 static inline int exp_req_replay_healthy(struct obd_export *exp)
1857 {
1858         return (!exp->exp_req_replay_needed ||
1859                 atomic_read(&exp->exp_replay_count) > 0);
1860 }
1861
1862
1863 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
1864 {
1865         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1866                exp_req_replay_healthy(exp);
1867 }
1868
1869 /** if export done lock_replay or has replay in queue */
1870 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1871 {
1872         return (!exp->exp_lock_replay_needed ||
1873                 atomic_read(&exp->exp_replay_count) > 0);
1874 }
1875
1876 static inline int exp_vbr_healthy(struct obd_export *exp)
1877 {
1878         return (!exp->exp_vbr_failed);
1879 }
1880
1881 static inline int exp_finished(struct obd_export *exp)
1882 {
1883         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1884 }
1885
1886 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
1887 {
1888         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1889                 exp_finished(exp);
1890 }
1891
1892 static int check_for_next_transno(struct lu_target *lut)
1893 {
1894         struct ptlrpc_request *req = NULL;
1895         struct obd_device *obd = lut->lut_obd;
1896         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
1897         int wake_up = 0, connected, completed, queue_len;
1898         __u64 req_transno = 0;
1899         __u64 update_transno = 0;
1900         __u64 next_transno = 0;
1901         ENTRY;
1902
1903         spin_lock(&obd->obd_recovery_task_lock);
1904         if (!list_empty(&obd->obd_req_replay_queue)) {
1905                 req = list_entry(obd->obd_req_replay_queue.next,
1906                                      struct ptlrpc_request, rq_list);
1907                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1908         }
1909
1910         if (tdtd != NULL)
1911                 update_transno = distribute_txn_get_next_transno(tdtd);
1912
1913         connected = atomic_read(&obd->obd_connected_clients);
1914         completed = connected - atomic_read(&obd->obd_req_replay_clients);
1915         queue_len = obd->obd_requests_queued_for_recovery;
1916         next_transno = obd->obd_next_recovery_transno;
1917
1918         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1919                "req_transno: %llu, next_transno: %llu\n",
1920                obd->obd_max_recoverable_clients, connected, completed,
1921                queue_len, req_transno, next_transno);
1922
1923         if (obd->obd_abort_recovery) {
1924                 CDEBUG(D_HA, "waking for aborted recovery\n");
1925                 wake_up = 1;
1926         } else if (obd->obd_recovery_expired) {
1927                 CDEBUG(D_HA, "waking for expired recovery\n");
1928                 wake_up = 1;
1929         } else if (tdtd != NULL && req != NULL &&
1930                    is_req_replayed_by_update(req)) {
1931                 LASSERTF(req_transno < next_transno, "req_transno %llu"
1932                          "next_transno%llu\n", req_transno, next_transno);
1933                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
1934                        req_transno);
1935                 wake_up = 1;
1936         } else if (req_transno == next_transno ||
1937                    (update_transno != 0 && update_transno <= next_transno)) {
1938                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
1939                 wake_up = 1;
1940         } else if (queue_len > 0 &&
1941                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1942                 /** handle gaps occured due to lost reply or VBR */
1943                 LASSERTF(req_transno >= next_transno,
1944                          "req_transno: %llu, next_transno: %llu\n",
1945                          req_transno, next_transno);
1946                 CDEBUG(D_HA,
1947                        "%s: waking for gap in transno, VBR is %s (skip: "
1948                        "%lld, ql: %d, comp: %d, conn: %d, next: %lld"
1949                        ", next_update %lld last_committed: %lld)\n",
1950                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1951                        next_transno, queue_len, completed, connected,
1952                        req_transno, update_transno, obd->obd_last_committed);
1953                 obd->obd_next_recovery_transno = req_transno;
1954                 wake_up = 1;
1955         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1956                 CDEBUG(D_HA, "waking for completed recovery\n");
1957                 wake_up = 1;
1958         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1959                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1960                        " by fail_lock, waking up (%lld)\n", next_transno);
1961                 obd->obd_next_recovery_transno = req_transno;
1962                 wake_up = 1;
1963         }
1964         spin_unlock(&obd->obd_recovery_task_lock);
1965         return wake_up;
1966 }
1967
1968 static int check_for_next_lock(struct lu_target *lut)
1969 {
1970         struct obd_device *obd = lut->lut_obd;
1971         int wake_up = 0;
1972
1973         spin_lock(&obd->obd_recovery_task_lock);
1974         if (!list_empty(&obd->obd_lock_replay_queue)) {
1975                 CDEBUG(D_HA, "waking for next lock\n");
1976                 wake_up = 1;
1977         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1978                 CDEBUG(D_HA, "waking for completed lock replay\n");
1979                 wake_up = 1;
1980         } else if (obd->obd_abort_recovery) {
1981                 CDEBUG(D_HA, "waking for aborted recovery\n");
1982                 wake_up = 1;
1983         } else if (obd->obd_recovery_expired) {
1984                 CDEBUG(D_HA, "waking for expired recovery\n");
1985                 wake_up = 1;
1986         }
1987         spin_unlock(&obd->obd_recovery_task_lock);
1988
1989         return wake_up;
1990 }
1991
1992 /**
1993  * wait for recovery events,
1994  * check its status with help of check_routine
1995  * evict dead clients via health_check
1996  */
1997 static int target_recovery_overseer(struct lu_target *lut,
1998                                     int (*check_routine)(struct lu_target *),
1999                                     int (*health_check)(struct obd_export *))
2000 {
2001         struct obd_device       *obd = lut->lut_obd;
2002         struct target_distribute_txn_data *tdtd;
2003 repeat:
2004         if (obd->obd_recovery_start != 0 && ktime_get_real_seconds() >=
2005               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
2006                 __u64 next_update_transno = 0;
2007
2008                 /* Only abort the recovery if there are no update recovery
2009                  * left in the queue */
2010                 spin_lock(&obd->obd_recovery_task_lock);
2011                 if (lut->lut_tdtd != NULL) {
2012                         next_update_transno =
2013                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2014
2015                         tdtd = lut->lut_tdtd;
2016                         /* If next_update_transno == 0, it probably because
2017                          * updatelog retrieve threads did not get any records
2018                          * yet, let's wait those threads stopped */
2019                         if (next_update_transno == 0) {
2020                                 struct l_wait_info lwi = { 0 };
2021
2022                                 l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2023                                        atomic_read(
2024                                        &tdtd->tdtd_recovery_threads_count) == 0,
2025                                        &lwi);
2026
2027                                 next_update_transno =
2028                                         distribute_txn_get_next_transno(
2029                                                                 lut->lut_tdtd);
2030                         }
2031                 }
2032
2033                 if (next_update_transno != 0 && !obd->obd_abort_recovery) {
2034                         obd->obd_next_recovery_transno = next_update_transno;
2035                         spin_unlock(&obd->obd_recovery_task_lock);
2036                         /* Disconnect unfinished exports from clients, and
2037                          * keep connection from MDT to make sure the update
2038                          * recovery will still keep trying until some one
2039                          * manually abort the recovery */
2040                         class_disconnect_stale_exports(obd,
2041                                                 exp_finished_or_from_mdt);
2042                         /* Abort all of replay and replay lock req from
2043                          * clients */
2044                         abort_req_replay_queue(obd);
2045                         abort_lock_replay_queue(obd);
2046                         CDEBUG(D_HA, "%s: there are still update replay (%#llx"
2047                                ")in the queue.\n", obd->obd_name,
2048                                next_update_transno);
2049                 } else {
2050                         obd->obd_abort_recovery = 1;
2051                         spin_unlock(&obd->obd_recovery_task_lock);
2052                         CWARN("%s recovery is aborted by hard timeout\n",
2053                               obd->obd_name);
2054                 }
2055         }
2056
2057         while (wait_event_timeout(obd->obd_next_transno_waitq,
2058                                   check_routine(lut),
2059                                   msecs_to_jiffies(60 * MSEC_PER_SEC)) == 0)
2060                 /* wait indefinitely for event, but don't trigger watchdog */;
2061
2062         if (obd->obd_abort_recovery) {
2063                 CWARN("recovery is aborted, evict exports in recovery\n");
2064                 if (lut->lut_tdtd != NULL) {
2065                         struct l_wait_info lwi = { 0 };
2066
2067                         tdtd = lut->lut_tdtd;
2068                         /* Let's wait all of the update log recovery thread
2069                          * finished */
2070                         l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2071                          atomic_read(&tdtd->tdtd_recovery_threads_count) == 0,
2072                              &lwi);
2073                         /* Then abort the update recovery list */
2074                         dtrq_list_destroy(lut->lut_tdtd);
2075                 }
2076
2077                 /** evict exports which didn't finish recovery yet */
2078                 class_disconnect_stale_exports(obd, exp_finished);
2079                 return 1;
2080         } else if (obd->obd_recovery_expired) {
2081                 obd->obd_recovery_expired = 0;
2082                 /** If some clients died being recovered, evict them */
2083                 LCONSOLE_WARN("%s: recovery is timed out, "
2084                               "evict stale exports\n", obd->obd_name);
2085                 /** evict cexports with no replay in queue, they are stalled */
2086                 class_disconnect_stale_exports(obd, health_check);
2087
2088                 /** continue with VBR */
2089                 spin_lock(&obd->obd_dev_lock);
2090                 obd->obd_version_recov = 1;
2091                 spin_unlock(&obd->obd_dev_lock);
2092                 /**
2093                  * reset timer, recovery will proceed with versions now,
2094                  * timeout is set just to handle reconnection delays
2095                  */
2096                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2097                 /** Wait for recovery events again, after evicting bad clients */
2098                 goto repeat;
2099         }
2100         return 0;
2101 }
2102
2103 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2104 {
2105         struct obd_device       *obd = lut->lut_obd;
2106         struct ptlrpc_request *req = NULL;
2107
2108         CDEBUG(D_HA, "Waiting for lock\n");
2109         if (target_recovery_overseer(lut, check_for_next_lock,
2110                                      exp_lock_replay_healthy))
2111                 abort_lock_replay_queue(obd);
2112
2113         spin_lock(&obd->obd_recovery_task_lock);
2114         if (!list_empty(&obd->obd_lock_replay_queue)) {
2115                 req = list_entry(obd->obd_lock_replay_queue.next,
2116                                      struct ptlrpc_request, rq_list);
2117                 list_del_init(&req->rq_list);
2118                 spin_unlock(&obd->obd_recovery_task_lock);
2119         } else {
2120                 spin_unlock(&obd->obd_recovery_task_lock);
2121                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2122                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2123                 /** evict exports failed VBR */
2124                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2125         }
2126         return req;
2127 }
2128
2129 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2130 {
2131         struct ptlrpc_request *req = NULL;
2132
2133         spin_lock(&obd->obd_recovery_task_lock);
2134         if (!list_empty(&obd->obd_final_req_queue)) {
2135                 req = list_entry(obd->obd_final_req_queue.next,
2136                                      struct ptlrpc_request, rq_list);
2137                 list_del_init(&req->rq_list);
2138                 spin_unlock(&obd->obd_recovery_task_lock);
2139                 if (req->rq_export->exp_in_recovery) {
2140                         spin_lock(&req->rq_export->exp_lock);
2141                         req->rq_export->exp_in_recovery = 0;
2142                         spin_unlock(&req->rq_export->exp_lock);
2143                 }
2144         } else {
2145                 spin_unlock(&obd->obd_recovery_task_lock);
2146         }
2147         return req;
2148 }
2149
2150 static void handle_recovery_req(struct ptlrpc_thread *thread,
2151                                 struct ptlrpc_request *req,
2152                                 svc_handler_t handler)
2153 {
2154         ENTRY;
2155
2156         /**
2157          * export can be evicted during recovery, no need to handle replays for
2158          * it after that, discard such request silently
2159          */
2160         if (req->rq_export->exp_disconnected)
2161                 RETURN_EXIT;
2162
2163         req->rq_session.lc_thread = thread;
2164         req->rq_svc_thread = thread;
2165         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2166
2167         /* thread context */
2168         lu_context_enter(&thread->t_env->le_ctx);
2169         (void)handler(req);
2170         lu_context_exit(&thread->t_env->le_ctx);
2171
2172         /* don't reset timer for final stage */
2173         if (!exp_finished(req->rq_export)) {
2174                 int to = obd_timeout;
2175
2176                 /**
2177                  * Add request timeout to the recovery time so next request from
2178                  * this client may come in recovery time
2179                  */
2180                 if (!AT_OFF) {
2181                         struct ptlrpc_service_part *svcpt;
2182
2183                         svcpt = req->rq_rqbd->rqbd_svcpt;
2184                         /* If the server sent early reply for this request,
2185                          * the client will recalculate the timeout according to
2186                          * current server estimate service time, so we will
2187                          * use the maxium timeout here for waiting the client
2188                          * sending the next req */
2189                         to = max((int)at_est2timeout(
2190                                  at_get(&svcpt->scp_at_estimate)),
2191                                  (int)lustre_msg_get_timeout(req->rq_reqmsg));
2192                         /* Add 2 net_latency, one for balance rq_deadline
2193                          * (see ptl_send_rpc), one for resend the req to server,
2194                          * Note: client will pack net_latency in replay req
2195                          * (see ptlrpc_replay_req) */
2196                         to += 2 * lustre_msg_get_service_time(req->rq_reqmsg);
2197                 }
2198                 extend_recovery_timer(class_exp2obd(req->rq_export), to, true);
2199         }
2200         EXIT;
2201 }
2202
2203 /** Checking routines for recovery */
2204 static int check_for_recovery_ready(struct lu_target *lut)
2205 {
2206         struct obd_device *obd = lut->lut_obd;
2207         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2208
2209         CDEBUG(D_HA, "connected %d stale %d max_recoverable_clients %d"
2210                " abort %d expired %d\n", clnts, obd->obd_stale_clients,
2211                obd->obd_max_recoverable_clients, obd->obd_abort_recovery,
2212                obd->obd_recovery_expired);
2213
2214         if (!obd->obd_abort_recovery && !obd->obd_recovery_expired) {
2215                 LASSERT(clnts <= obd->obd_max_recoverable_clients);
2216                 if (clnts + obd->obd_stale_clients <
2217                     obd->obd_max_recoverable_clients)
2218                         return 0;
2219         }
2220
2221         if (lut->lut_tdtd != NULL) {
2222                 if (!lut->lut_tdtd->tdtd_replay_ready &&
2223                     !obd->obd_abort_recovery) {
2224                         /* Let's extend recovery timer, in case the recovery
2225                          * timer expired, and some clients got evicted */
2226                         extend_recovery_timer(obd, obd->obd_recovery_timeout,
2227                                               true);
2228                         CDEBUG(D_HA, "%s update recovery is not ready, extend recovery %llu\n",
2229                                obd->obd_name, obd->obd_recovery_timeout);
2230                         return 0;
2231                 }
2232         }
2233
2234         return 1;
2235 }
2236
2237 enum {
2238         REQUEST_RECOVERY = 1,
2239         UPDATE_RECOVERY = 2,
2240 };
2241
2242 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2243 {
2244         __u64 transno = 0;
2245
2246         if (!list_empty(&obd->obd_req_replay_queue)) {
2247                 struct ptlrpc_request *req;
2248
2249                 req = list_entry(obd->obd_req_replay_queue.next,
2250                                  struct ptlrpc_request, rq_list);
2251                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2252         }
2253
2254         return transno;
2255 }
2256
2257 static __u64 get_next_transno(struct lu_target *lut, int *type)
2258 {
2259         struct obd_device *obd = lut->lut_obd;
2260         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2261         __u64 transno = 0;
2262         __u64 update_transno;
2263         ENTRY;
2264
2265         transno = get_next_replay_req_transno(obd);
2266         if (type != NULL)
2267                 *type = REQUEST_RECOVERY;
2268
2269         if (tdtd == NULL)
2270                 RETURN(transno);
2271
2272         update_transno = distribute_txn_get_next_transno(tdtd);
2273         if (transno == 0 || (transno >= update_transno &&
2274                              update_transno != 0)) {
2275                 transno = update_transno;
2276                 if (type != NULL)
2277                         *type = UPDATE_RECOVERY;
2278         }
2279
2280         RETURN(transno);
2281 }
2282
2283 /**
2284  * drop duplicate replay request
2285  *
2286  * Because the operation has been replayed by update recovery, the request
2287  * with the same transno will be dropped and also notify the client to send
2288  * next replay request.
2289  *
2290  * \param[in] env       execution environment
2291  * \param[in] obd       failover obd device
2292  * \param[in] req       request to be dropped
2293  */
2294 static void drop_duplicate_replay_req(struct lu_env *env,
2295                                       struct obd_device *obd,
2296                                       struct ptlrpc_request *req)
2297 {
2298         DEBUG_REQ(D_HA, req, "remove t%lld from %s because of duplicate"
2299                   " update records are found.\n",
2300                   lustre_msg_get_transno(req->rq_reqmsg),
2301                   libcfs_nid2str(req->rq_peer.nid));
2302
2303         /* Right now, only for MDS reint operation update replay and
2304          * normal request replay can have the same transno */
2305         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT) {
2306                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2307                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2308                 if (likely(req->rq_export))
2309                         target_committed_to_req(req);
2310                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2311                 target_send_reply(req, req->rq_status, 0);
2312         } else {
2313                 DEBUG_REQ(D_ERROR, req, "wrong opc" "from %s\n",
2314                 libcfs_nid2str(req->rq_peer.nid));
2315         }
2316         target_exp_dequeue_req_replay(req);
2317         target_request_copy_put(req);
2318         obd->obd_replayed_requests++;
2319 }
2320
2321 static void replay_request_or_update(struct lu_env *env,
2322                                      struct lu_target *lut,
2323                                      struct target_recovery_data *trd,
2324                                      struct ptlrpc_thread *thread)
2325 {
2326         struct obd_device *obd = lut->lut_obd;
2327         struct ptlrpc_request *req = NULL;
2328         int                     type;
2329         __u64                   transno;
2330         ENTRY;
2331
2332         CDEBUG(D_HA, "Waiting for transno %lld\n",
2333                obd->obd_next_recovery_transno);
2334
2335         /* Replay all of request and update by transno */
2336         do {
2337                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2338
2339                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2340
2341                 /** It is needed to extend recovery window above
2342                  *  recovery_time_soft. Extending is possible only in the
2343                  *  end of recovery window (see more details in
2344                  *  handle_recovery_req()).
2345                  */
2346                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2347
2348                 if (target_recovery_overseer(lut, check_for_next_transno,
2349                                         exp_req_replay_healthy_or_from_mdt)) {
2350                         abort_req_replay_queue(obd);
2351                         abort_lock_replay_queue(obd);
2352                         goto abort;
2353                 }
2354
2355                 spin_lock(&obd->obd_recovery_task_lock);
2356                 transno = get_next_transno(lut, &type);
2357                 if (type == REQUEST_RECOVERY && transno != 0) {
2358                         /* Drop replay request from client side, if the
2359                          * replay has been executed by update with the
2360                          * same transno */
2361                         req = list_entry(obd->obd_req_replay_queue.next,
2362                                         struct ptlrpc_request, rq_list);
2363
2364                         list_del_init(&req->rq_list);
2365                         obd->obd_requests_queued_for_recovery--;
2366                         spin_unlock(&obd->obd_recovery_task_lock);
2367
2368                         /* Let's check if the request has been redone by
2369                          * update replay */
2370                         if (is_req_replayed_by_update(req)) {
2371                                 struct distribute_txn_replay_req *dtrq;
2372
2373                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2374                                                                    req->rq_xid);
2375                                 LASSERT(dtrq != NULL);
2376                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2377                                 list_del_init(&dtrq->dtrq_list);
2378                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2379                                 dtrq_destroy(dtrq);
2380
2381                                 drop_duplicate_replay_req(env, obd, req);
2382
2383                                 continue;
2384                         }
2385
2386                         LASSERT(trd->trd_processing_task == current_pid());
2387                         DEBUG_REQ(D_HA, req, "processing t%lld from %s",
2388                                   lustre_msg_get_transno(req->rq_reqmsg),
2389                                   libcfs_nid2str(req->rq_peer.nid));
2390
2391                         handle_recovery_req(thread, req,
2392                                             trd->trd_recovery_handler);
2393                         /**
2394                          * bz18031: increase next_recovery_transno before
2395                          * target_request_copy_put() will drop exp_rpc reference
2396                          */
2397                         spin_lock(&obd->obd_recovery_task_lock);
2398                         obd->obd_next_recovery_transno++;
2399                         spin_unlock(&obd->obd_recovery_task_lock);
2400                         target_exp_dequeue_req_replay(req);
2401                         target_request_copy_put(req);
2402                         obd->obd_replayed_requests++;
2403                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2404                         struct distribute_txn_replay_req *dtrq;
2405                         int rc;
2406
2407                         spin_unlock(&obd->obd_recovery_task_lock);
2408
2409                         LASSERT(tdtd != NULL);
2410                         dtrq = distribute_txn_get_next_req(tdtd);
2411                         lu_context_enter(&thread->t_env->le_ctx);
2412                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2413                         lu_context_exit(&thread->t_env->le_ctx);
2414                         extend_recovery_timer(obd, obd_timeout, true);
2415
2416                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2417                                 CDEBUG(D_HA, "Move x%llu t%llu"
2418                                        " to finish list\n", dtrq->dtrq_xid,
2419                                        dtrq->dtrq_master_transno);
2420
2421                                 /* Add it to the replay finish list */
2422                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2423                                 list_add(&dtrq->dtrq_list,
2424                                          &tdtd->tdtd_replay_finish_list);
2425                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2426
2427                                 spin_lock(&obd->obd_recovery_task_lock);
2428                                 if (transno == obd->obd_next_recovery_transno)
2429                                         obd->obd_next_recovery_transno++;
2430                                 else if (transno >
2431                                          obd->obd_next_recovery_transno)
2432                                         obd->obd_next_recovery_transno =
2433                                                                 transno + 1;
2434                                 spin_unlock(&obd->obd_recovery_task_lock);
2435                         } else {
2436                                 dtrq_destroy(dtrq);
2437                         }
2438                 } else {
2439                         spin_unlock(&obd->obd_recovery_task_lock);
2440 abort:
2441                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2442                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2443                         /** evict exports failed VBR */
2444                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2445                         break;
2446                 }
2447         } while (1);
2448 }
2449
2450 static int target_recovery_thread(void *arg)
2451 {
2452         struct lu_target *lut = arg;
2453         struct obd_device *obd = lut->lut_obd;
2454         struct ptlrpc_request *req;
2455         struct target_recovery_data *trd = &obd->obd_recovery_data;
2456         unsigned long delta;
2457         struct lu_env *env;
2458         struct ptlrpc_thread *thread = NULL;
2459         int rc = 0;
2460         ENTRY;
2461
2462         unshare_fs_struct();
2463         OBD_ALLOC_PTR(thread);
2464         if (thread == NULL)
2465                 RETURN(-ENOMEM);
2466
2467         OBD_ALLOC_PTR(env);
2468         if (env == NULL) {
2469                 OBD_FREE_PTR(thread);
2470                 RETURN(-ENOMEM);
2471         }
2472
2473         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2474         if (rc) {
2475                 OBD_FREE_PTR(thread);
2476                 OBD_FREE_PTR(env);
2477                 RETURN(rc);
2478         }
2479
2480         thread->t_env = env;
2481         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2482         env->le_ctx.lc_thread = thread;
2483         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2484         thread->t_watchdog = NULL;
2485
2486         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2487                current_pid());
2488         trd->trd_processing_task = current_pid();
2489
2490         spin_lock(&obd->obd_dev_lock);
2491         obd->obd_recovering = 1;
2492         spin_unlock(&obd->obd_dev_lock);
2493         complete(&trd->trd_starting);
2494
2495         /* first of all, we have to know the first transno to replay */
2496         if (target_recovery_overseer(lut, check_for_recovery_ready,
2497                                      exp_connect_healthy)) {
2498                 abort_req_replay_queue(obd);
2499                 abort_lock_replay_queue(obd);
2500                 if (lut->lut_tdtd != NULL)
2501                         dtrq_list_destroy(lut->lut_tdtd);
2502         }
2503
2504         /* next stage: replay requests or update */
2505         delta = jiffies;
2506         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2507                atomic_read(&obd->obd_req_replay_clients),
2508                obd->obd_next_recovery_transno);
2509         replay_request_or_update(env, lut, trd, thread);
2510
2511         /**
2512          * The second stage: replay locks
2513          */
2514         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2515                atomic_read(&obd->obd_lock_replay_clients));
2516         while ((req = target_next_replay_lock(lut))) {
2517                 LASSERT(trd->trd_processing_task == current_pid());
2518                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
2519                           libcfs_nid2str(req->rq_peer.nid));
2520                 handle_recovery_req(thread, req,
2521                                     trd->trd_recovery_handler);
2522                 target_request_copy_put(req);
2523                 obd->obd_replayed_locks++;
2524         }
2525
2526         /**
2527          * The third stage: reply on final pings, at this moment all clients
2528          * must have request in final queue
2529          */
2530         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2531         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2532         /** Update server last boot epoch */
2533         tgt_boot_epoch_update(lut);
2534         /* We drop recoverying flag to forward all new requests
2535          * to regular mds_handle() since now */
2536         spin_lock(&obd->obd_dev_lock);
2537         obd->obd_recovering = obd->obd_abort_recovery = 0;
2538         spin_unlock(&obd->obd_dev_lock);
2539         spin_lock(&obd->obd_recovery_task_lock);
2540         target_cancel_recovery_timer(obd);
2541         spin_unlock(&obd->obd_recovery_task_lock);
2542         while ((req = target_next_final_ping(obd))) {
2543                 LASSERT(trd->trd_processing_task == current_pid());
2544                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
2545                           libcfs_nid2str(req->rq_peer.nid));
2546                 handle_recovery_req(thread, req,
2547                                     trd->trd_recovery_handler);
2548                 /* Because the waiting client can not send ping to server,
2549                  * so we need refresh the last_request_time, to avoid the
2550                  * export is being evicted */
2551                 ptlrpc_update_export_timer(req->rq_export, 0);
2552                 target_request_copy_put(req);
2553         }
2554
2555         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2556         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
2557               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2558         if (delta > OBD_RECOVERY_TIME_SOFT) {
2559                 CWARN("too long recovery - read logs\n");
2560                 libcfs_debug_dumplog();
2561         }
2562
2563         target_finish_recovery(lut);
2564
2565         lu_context_fini(&env->le_ctx);
2566         trd->trd_processing_task = 0;
2567         complete(&trd->trd_finishing);
2568
2569         tgt_io_thread_done(thread);
2570         OBD_FREE_PTR(thread);
2571         OBD_FREE_PTR(env);
2572         RETURN(rc);
2573 }
2574
2575 static int target_start_recovery_thread(struct lu_target *lut,
2576                                         svc_handler_t handler)
2577 {
2578         struct obd_device *obd = lut->lut_obd;
2579         int rc = 0;
2580         struct target_recovery_data *trd = &obd->obd_recovery_data;
2581         int index;
2582
2583         memset(trd, 0, sizeof(*trd));
2584         init_completion(&trd->trd_starting);
2585         init_completion(&trd->trd_finishing);
2586         trd->trd_recovery_handler = handler;
2587
2588         rc = server_name2index(obd->obd_name, &index, NULL);
2589         if (rc < 0)
2590                 return rc;
2591
2592         if (!IS_ERR(kthread_run(target_recovery_thread,
2593                                 lut, "tgt_recover_%d", index))) {
2594                 wait_for_completion(&trd->trd_starting);
2595                 LASSERT(obd->obd_recovering != 0);
2596         } else {
2597                 rc = -ECHILD;
2598         }
2599
2600         return rc;
2601 }
2602
2603 void target_stop_recovery_thread(struct obd_device *obd)
2604 {
2605         if (obd->obd_recovery_data.trd_processing_task > 0) {
2606                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2607                 /** recovery can be done but postrecovery is not yet */
2608                 spin_lock(&obd->obd_dev_lock);
2609                 if (obd->obd_recovering) {
2610                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2611                         obd->obd_abort_recovery = 1;
2612                         wake_up(&obd->obd_next_transno_waitq);
2613                 }
2614                 spin_unlock(&obd->obd_dev_lock);
2615                 wait_for_completion(&trd->trd_finishing);
2616         }
2617 }
2618 EXPORT_SYMBOL(target_stop_recovery_thread);
2619
2620 void target_recovery_fini(struct obd_device *obd)
2621 {
2622         class_disconnect_exports(obd);
2623         target_stop_recovery_thread(obd);
2624         target_cleanup_recovery(obd);
2625 }
2626 EXPORT_SYMBOL(target_recovery_fini);
2627
2628 static void target_recovery_expired(unsigned long castmeharder)
2629 {
2630         struct obd_device *obd = (struct obd_device *)castmeharder;
2631         CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
2632                " after %llus (%d clients connected)\n",
2633                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2634                (s64)(ktime_get_real_seconds() - obd->obd_recovery_start),
2635                atomic_read(&obd->obd_connected_clients));
2636
2637         obd->obd_recovery_expired = 1;
2638         wake_up(&obd->obd_next_transno_waitq);
2639 }
2640
2641 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2642 {
2643         struct obd_device *obd = lut->lut_obd;
2644
2645         if (lut->lut_bottom->dd_rdonly)
2646                 return;
2647
2648         if (obd->obd_max_recoverable_clients == 0) {
2649                 /** Update server last boot epoch */
2650                 tgt_boot_epoch_update(lut);
2651                 return;
2652         }
2653
2654         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2655                "last_transno %llu\n", obd->obd_name,
2656                obd->obd_max_recoverable_clients, obd->obd_last_committed);
2657         LASSERT(obd->obd_stopping == 0);
2658         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2659         obd->obd_recovery_start = 0;
2660         obd->obd_recovery_end = 0;
2661
2662         setup_timer(&obd->obd_recovery_timer, target_recovery_expired,
2663                     (unsigned long)obd);
2664         target_start_recovery_thread(lut, handler);
2665 }
2666 EXPORT_SYMBOL(target_recovery_init);
2667
2668 static int target_process_req_flags(struct obd_device *obd,
2669                                     struct ptlrpc_request *req)
2670 {
2671         struct obd_export *exp = req->rq_export;
2672         LASSERT(exp != NULL);
2673         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2674                 /* client declares he's ready to replay locks */
2675                 spin_lock(&exp->exp_lock);
2676                 if (exp->exp_req_replay_needed) {
2677                         exp->exp_req_replay_needed = 0;
2678                         spin_unlock(&exp->exp_lock);
2679
2680                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2681                         atomic_dec(&obd->obd_req_replay_clients);
2682                 } else {
2683                         spin_unlock(&exp->exp_lock);
2684                 }
2685         }
2686         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2687                 /* client declares he's ready to complete recovery
2688                  * so, we put the request on th final queue */
2689                 spin_lock(&exp->exp_lock);
2690                 if (exp->exp_lock_replay_needed) {
2691                         exp->exp_lock_replay_needed = 0;
2692                         spin_unlock(&exp->exp_lock);
2693
2694                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
2695                         atomic_dec(&obd->obd_lock_replay_clients);
2696                 } else {
2697                         spin_unlock(&exp->exp_lock);
2698                 }
2699         }
2700         return 0;
2701 }
2702
2703 int target_queue_recovery_request(struct ptlrpc_request *req,
2704                                   struct obd_device *obd)
2705 {
2706         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
2707         struct ptlrpc_request *reqiter;
2708         int inserted = 0;
2709         ENTRY;
2710
2711         if (obd->obd_recovery_data.trd_processing_task == current_pid()) {
2712                 /* Processing the queue right now, don't re-add. */
2713                 RETURN(1);
2714         }
2715
2716         target_process_req_flags(obd, req);
2717
2718         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2719                 /* client declares he's ready to complete recovery
2720                  * so, we put the request on th final queue */
2721                 target_request_copy_get(req);
2722                 DEBUG_REQ(D_HA, req, "queue final req");
2723                 wake_up(&obd->obd_next_transno_waitq);
2724                 spin_lock(&obd->obd_recovery_task_lock);
2725                 if (obd->obd_recovering) {
2726                         struct ptlrpc_request *tmp;
2727                         struct ptlrpc_request *duplicate = NULL;
2728
2729                         if (likely(!req->rq_export->exp_replay_done)) {
2730                                 req->rq_export->exp_replay_done = 1;
2731                                 list_add_tail(&req->rq_list,
2732                                               &obd->obd_final_req_queue);
2733                                 spin_unlock(&obd->obd_recovery_task_lock);
2734                                 RETURN(0);
2735                         }
2736
2737                         /* XXX O(n), but only happens if final ping is
2738                          * timed out, probably reorganize the list as
2739                          * a hash list later */
2740                         list_for_each_entry_safe(reqiter, tmp,
2741                                                  &obd->obd_final_req_queue,
2742                                                  rq_list) {
2743                                 if (reqiter->rq_export == req->rq_export) {
2744                                         list_del_init(&reqiter->rq_list);
2745                                         duplicate = reqiter;
2746                                         break;
2747                                 }
2748                         }
2749
2750                         list_add_tail(&req->rq_list,
2751                                       &obd->obd_final_req_queue);
2752                         req->rq_export->exp_replay_done = 1;
2753                         spin_unlock(&obd->obd_recovery_task_lock);
2754
2755                         if (duplicate != NULL) {
2756                                 DEBUG_REQ(D_HA, duplicate,
2757                                           "put prev final req\n");
2758                                 target_request_copy_put(duplicate);
2759                         }
2760                         RETURN(0);
2761                 } else {
2762                         spin_unlock(&obd->obd_recovery_task_lock);
2763                         target_request_copy_put(req);
2764                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
2765                 }
2766         }
2767         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2768                 /* client declares he's ready to replay locks */
2769                 target_request_copy_get(req);
2770                 DEBUG_REQ(D_HA, req, "queue lock replay req");
2771                 wake_up(&obd->obd_next_transno_waitq);
2772                 spin_lock(&obd->obd_recovery_task_lock);
2773                 LASSERT(obd->obd_recovering);
2774                 /* usually due to recovery abort */
2775                 if (!req->rq_export->exp_in_recovery) {
2776                         spin_unlock(&obd->obd_recovery_task_lock);
2777                         target_request_copy_put(req);
2778                         RETURN(-ENOTCONN);
2779                 }
2780                 LASSERT(req->rq_export->exp_lock_replay_needed);
2781                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
2782                 spin_unlock(&obd->obd_recovery_task_lock);
2783                 RETURN(0);
2784         }
2785
2786         /* CAVEAT EMPTOR: The incoming request message has been swabbed
2787          * (i.e. buflens etc are in my own byte order), but type-dependent
2788          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed. */
2789
2790         if (!transno) {
2791                 INIT_LIST_HEAD(&req->rq_list);
2792                 DEBUG_REQ(D_HA, req, "not queueing");
2793                 RETURN(1);
2794         }
2795
2796         /* If we're processing the queue, we want don't want to queue this
2797          * message.
2798          *
2799          * Also, if this request has a transno less than the one we're waiting
2800          * for, we should process it now.  It could (and currently always will)
2801          * be an open request for a descriptor that was opened some time ago.
2802          *
2803          * Also, a resent, replayed request that has already been
2804          * handled will pass through here and be processed immediately.
2805          */
2806         CDEBUG(D_HA, "Next recovery transno: %llu"
2807                ", current: %llu, replaying\n",
2808                obd->obd_next_recovery_transno, transno);
2809
2810         /* If the request has been replayed by update replay, then sends this
2811          * request to the recovery thread (replay_request_or_update()), where
2812          * it will be handled */
2813         spin_lock(&obd->obd_recovery_task_lock);
2814         if (transno < obd->obd_next_recovery_transno &&
2815             !is_req_replayed_by_update(req)) {
2816                 /* Processing the queue right now, don't re-add. */
2817                 LASSERT(list_empty(&req->rq_list));
2818                 spin_unlock(&obd->obd_recovery_task_lock);
2819                 RETURN(1);
2820         }
2821         spin_unlock(&obd->obd_recovery_task_lock);
2822
2823         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2824                 RETURN(0);
2825
2826         target_request_copy_get(req);
2827         if (!req->rq_export->exp_in_recovery) {
2828                 target_request_copy_put(req);
2829                 RETURN(-ENOTCONN);
2830         }
2831         LASSERT(req->rq_export->exp_req_replay_needed);
2832
2833         if (target_exp_enqueue_req_replay(req)) {
2834                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2835                 target_request_copy_put(req);
2836                 RETURN(0);
2837         }
2838
2839         /* XXX O(n^2) */
2840         spin_lock(&obd->obd_recovery_task_lock);
2841         LASSERT(obd->obd_recovering);
2842         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
2843                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2844                         list_add_tail(&req->rq_list, &reqiter->rq_list);
2845                         inserted = 1;
2846                         goto added;
2847                 }
2848
2849                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2850                              transno)) {
2851                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2852                                   "has been claimed by another client");
2853                         spin_unlock(&obd->obd_recovery_task_lock);
2854                         target_exp_dequeue_req_replay(req);
2855                         target_request_copy_put(req);
2856                         RETURN(0);
2857                 }
2858         }
2859 added:
2860         if (!inserted)
2861                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2862
2863         obd->obd_requests_queued_for_recovery++;
2864         spin_unlock(&obd->obd_recovery_task_lock);
2865         wake_up(&obd->obd_next_transno_waitq);
2866         RETURN(0);
2867 }
2868
2869 int target_handle_ping(struct ptlrpc_request *req)
2870 {
2871         obd_ping(req->rq_svc_thread->t_env, req->rq_export);
2872         return req_capsule_server_pack(&req->rq_pill);
2873 }
2874
2875 void target_committed_to_req(struct ptlrpc_request *req)
2876 {
2877         struct obd_export *exp = req->rq_export;
2878
2879         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2880                 lustre_msg_set_last_committed(req->rq_repmsg,
2881                                               exp->exp_last_committed);
2882         else
2883                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2884                           "%d)", exp->exp_obd->obd_no_transno,
2885                           req->rq_repmsg == NULL);
2886
2887         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
2888                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2889 }
2890
2891 #endif /* HAVE_SERVER_SUPPORT */
2892
2893 /**
2894  * Packs current SLV and Limit into \a req.
2895  */
2896 int target_pack_pool_reply(struct ptlrpc_request *req)
2897 {
2898         struct obd_device *obd;
2899         ENTRY;
2900
2901         /* Check that we still have all structures alive as this may
2902          * be some late RPC at shutdown time. */
2903         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2904                      !exp_connect_lru_resize(req->rq_export))) {
2905                 lustre_msg_set_slv(req->rq_repmsg, 0);
2906                 lustre_msg_set_limit(req->rq_repmsg, 0);
2907                 RETURN(0);
2908         }
2909
2910         /* OBD is alive here as export is alive, which we checked above. */
2911         obd = req->rq_export->exp_obd;
2912
2913         read_lock(&obd->obd_pool_lock);
2914         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2915         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2916         read_unlock(&obd->obd_pool_lock);
2917
2918         RETURN(0);
2919 }
2920
2921 static int target_send_reply_msg(struct ptlrpc_request *req,
2922                                  int rc, int fail_id)
2923 {
2924         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2925                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2926                 return -ECOMM;
2927         }
2928         /* We can have a null rq_reqmsg in the event of bad signature or
2929          * no context when unwrapping */
2930         if (req->rq_reqmsg &&
2931             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
2932             OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
2933                 return -ECOMM;
2934
2935         if (unlikely(rc)) {
2936                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
2937                 req->rq_status = rc;
2938                 return ptlrpc_send_error(req, 1);
2939         } else {
2940                 DEBUG_REQ(D_NET, req, "sending reply");
2941         }
2942
2943         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
2944 }
2945
2946 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2947 {
2948         struct ptlrpc_service_part *svcpt;
2949         int                        netrc;
2950         struct ptlrpc_reply_state *rs;
2951         struct obd_export         *exp;
2952         ENTRY;
2953
2954         if (req->rq_no_reply) {
2955                 EXIT;
2956                 return;
2957         }
2958
2959         svcpt = req->rq_rqbd->rqbd_svcpt;
2960         rs = req->rq_reply_state;
2961         if (rs == NULL || !rs->rs_difficult) {
2962                 /* no notifiers */
2963                 target_send_reply_msg (req, rc, fail_id);
2964                 EXIT;
2965                 return;
2966         }
2967
2968         /* must be an export if locks saved */
2969         LASSERT(req->rq_export != NULL);
2970         /* req/reply consistent */
2971         LASSERT(rs->rs_svcpt == svcpt);
2972
2973         /* "fresh" reply */
2974         LASSERT(!rs->rs_scheduled);
2975         LASSERT(!rs->rs_scheduled_ever);
2976         LASSERT(!rs->rs_handled);
2977         LASSERT(!rs->rs_on_net);
2978         LASSERT(rs->rs_export == NULL);
2979         LASSERT(list_empty(&rs->rs_obd_list));
2980         LASSERT(list_empty(&rs->rs_exp_list));
2981
2982         exp = class_export_get(req->rq_export);
2983
2984         /* disable reply scheduling while I'm setting up */
2985         rs->rs_scheduled = 1;
2986         rs->rs_on_net    = 1;
2987         rs->rs_xid       = req->rq_xid;
2988         rs->rs_transno   = req->rq_transno;
2989         rs->rs_export    = exp;
2990         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
2991
2992         spin_lock(&exp->exp_uncommitted_replies_lock);
2993         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
2994                rs->rs_transno, exp->exp_last_committed);
2995         if (rs->rs_transno > exp->exp_last_committed) {
2996                 /* not committed already */
2997                 list_add_tail(&rs->rs_obd_list,
2998                                   &exp->exp_uncommitted_replies);
2999         }
3000         spin_unlock(&exp->exp_uncommitted_replies_lock);
3001
3002         spin_lock(&exp->exp_lock);
3003         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
3004         spin_unlock(&exp->exp_lock);
3005
3006         netrc = target_send_reply_msg(req, rc, fail_id);
3007
3008         spin_lock(&svcpt->scp_rep_lock);
3009
3010         atomic_inc(&svcpt->scp_nreps_difficult);
3011
3012         if (netrc != 0) {
3013                 /* error sending: reply is off the net.  Also we need +1
3014                  * reply ref until ptlrpc_handle_rs() is done
3015                  * with the reply state (if the send was successful, there
3016                  * would have been +1 ref for the net, which
3017                  * reply_out_callback leaves alone) */
3018                 rs->rs_on_net = 0;
3019                 ptlrpc_rs_addref(rs);
3020         }
3021
3022         spin_lock(&rs->rs_lock);
3023         if (rs->rs_transno <= exp->exp_last_committed ||
3024             (!rs->rs_on_net && !rs->rs_no_ack) ||
3025             list_empty(&rs->rs_exp_list) ||     /* completed already */
3026             list_empty(&rs->rs_obd_list)) {
3027                 CDEBUG(D_HA, "Schedule reply immediately\n");
3028                 ptlrpc_dispatch_difficult_reply(rs);
3029         } else {
3030                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
3031                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
3032         }
3033         spin_unlock(&rs->rs_lock);
3034         spin_unlock(&svcpt->scp_rep_lock);
3035         EXIT;
3036 }
3037
3038 enum ldlm_mode lck_compat_array[] = {
3039         [LCK_EX]    = LCK_COMPAT_EX,
3040         [LCK_PW]    = LCK_COMPAT_PW,
3041         [LCK_PR]    = LCK_COMPAT_PR,
3042         [LCK_CW]    = LCK_COMPAT_CW,
3043         [LCK_CR]    = LCK_COMPAT_CR,
3044         [LCK_NL]    = LCK_COMPAT_NL,
3045         [LCK_GROUP] = LCK_COMPAT_GROUP,
3046         [LCK_COS]   = LCK_COMPAT_COS,
3047 };
3048
3049 /**
3050  * Rather arbitrary mapping from LDLM error codes to errno values. This should
3051  * not escape to the user level.
3052  */
3053 int ldlm_error2errno(enum ldlm_error error)
3054 {
3055         int result;
3056
3057         switch (error) {
3058         case ELDLM_OK:
3059         case ELDLM_LOCK_MATCHED:
3060                 result = 0;
3061                 break;
3062         case ELDLM_LOCK_CHANGED:
3063                 result = -ESTALE;
3064                 break;
3065         case ELDLM_LOCK_ABORTED:
3066                 result = -ENAVAIL;
3067                 break;
3068         case ELDLM_LOCK_REPLACED:
3069                 result = -ESRCH;
3070                 break;
3071         case ELDLM_NO_LOCK_DATA:
3072                 result = -ENOENT;
3073                 break;
3074         case ELDLM_NAMESPACE_EXISTS:
3075                 result = -EEXIST;
3076                 break;
3077         case ELDLM_BAD_NAMESPACE:
3078                 result = -EBADF;
3079                 break;
3080         default:
3081                 if (((int)error) < 0) { /* cast to signed type */
3082                         result = error; /* as ldlm_error can be unsigned */
3083                 } else {
3084                         CERROR("Invalid DLM result code: %d\n", error);
3085                         result = -EPROTO;
3086                 }
3087         }
3088         return result;
3089 }
3090 EXPORT_SYMBOL(ldlm_error2errno);
3091
3092 /**
3093  * Dual to ldlm_error2errno(): maps errno values back to enum ldlm_error.
3094  */
3095 enum ldlm_error ldlm_errno2error(int err_no)
3096 {
3097         int error;
3098
3099         switch (err_no) {
3100         case 0:
3101                 error = ELDLM_OK;
3102                 break;
3103         case -ESTALE:
3104                 error = ELDLM_LOCK_CHANGED;
3105                 break;
3106         case -ENAVAIL:
3107                 error = ELDLM_LOCK_ABORTED;
3108                 break;
3109         case -ESRCH:
3110                 error = ELDLM_LOCK_REPLACED;
3111                 break;
3112         case -ENOENT:
3113                 error = ELDLM_NO_LOCK_DATA;
3114                 break;
3115         case -EEXIST:
3116                 error = ELDLM_NAMESPACE_EXISTS;
3117                 break;
3118         case -EBADF:
3119                 error = ELDLM_BAD_NAMESPACE;
3120                 break;
3121         default:
3122                 error = err_no;
3123         }
3124         return error;
3125 }
3126
3127 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3128 void ldlm_dump_export_locks(struct obd_export *exp)
3129 {
3130         spin_lock(&exp->exp_locks_list_guard);
3131         if (!list_empty(&exp->exp_locks_list)) {
3132                 struct ldlm_lock *lock;
3133
3134                 CERROR("dumping locks for export %p,"
3135                        "ignore if the unmount doesn't hang\n", exp);
3136                 list_for_each_entry(lock, &exp->exp_locks_list,
3137                                         l_exp_refs_link)
3138                         LDLM_ERROR(lock, "lock:");
3139         }
3140         spin_unlock(&exp->exp_locks_list_guard);
3141 }
3142 #endif
3143
3144 #ifdef HAVE_SERVER_SUPPORT
3145 static int target_bulk_timeout(void *data)
3146 {
3147         ENTRY;
3148         /* We don't fail the connection here, because having the export
3149          * killed makes the (vital) call to commitrw very sad.
3150          */
3151         RETURN(1);
3152 }
3153
3154 static inline const char *bulk2type(struct ptlrpc_request *req)
3155 {
3156         if (req->rq_bulk_read)
3157                 return "READ";
3158         if (req->rq_bulk_write)
3159                 return "WRITE";
3160         return "UNKNOWN";
3161 }
3162
3163 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc,
3164                    struct l_wait_info *lwi)
3165 {
3166         struct ptlrpc_request   *req = desc->bd_req;
3167         time_t                   start = cfs_time_current_sec();
3168         time_t                   deadline;
3169         int                      rc = 0;
3170
3171         ENTRY;
3172
3173         /* If there is eviction in progress, wait for it to finish. */
3174         if (unlikely(atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
3175                 *lwi = LWI_INTR(NULL, NULL);
3176                 rc = l_wait_event(exp->exp_obd->obd_evict_inprogress_waitq,
3177                                   !atomic_read(&exp->exp_obd->
3178                                                    obd_evict_inprogress),
3179                                   lwi);
3180         }
3181
3182         /* Check if client was evicted or reconnected already. */
3183         if (exp->exp_failed ||
3184             exp->exp_conn_cnt > lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3185                 rc = -ENOTCONN;
3186         } else {
3187                 if (req->rq_bulk_read)
3188                         rc = sptlrpc_svc_wrap_bulk(req, desc);
3189
3190                 if (OCD_HAS_FLAG(&exp->exp_connect_data, BULK_MBITS))
3191                         req->rq_mbits = lustre_msg_get_mbits(req->rq_reqmsg);
3192                 else /* old version, bulk matchbits is rq_xid */
3193                         req->rq_mbits = req->rq_xid;
3194
3195                 if (rc == 0)
3196                         rc = ptlrpc_start_bulk_transfer(desc);
3197         }
3198
3199         if (rc < 0) {
3200                 DEBUG_REQ(D_ERROR, req, "bulk %s failed: rc %d",
3201                           bulk2type(req), rc);
3202                 RETURN(rc);
3203         }
3204
3205         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
3206                 ptlrpc_abort_bulk(desc);
3207                 RETURN(0);
3208         }
3209
3210         /* limit actual bulk transfer to bulk_timeout seconds */
3211         deadline = start + bulk_timeout;
3212         if (deadline > req->rq_deadline)
3213                 deadline = req->rq_deadline;
3214
3215         do {
3216                 long timeoutl = deadline - cfs_time_current_sec();
3217                 cfs_duration_t timeout = timeoutl <= 0 ?
3218                                          CFS_TICK : cfs_time_seconds(timeoutl);
3219                 time_t  rq_deadline;
3220
3221                 *lwi = LWI_TIMEOUT_INTERVAL(timeout, cfs_time_seconds(1),
3222                                             target_bulk_timeout, desc);
3223                 rc = l_wait_event(desc->bd_waitq,
3224                                   !ptlrpc_server_bulk_active(desc) ||
3225                                   exp->exp_failed ||
3226                                   exp->exp_conn_cnt >
3227                                   lustre_msg_get_conn_cnt(req->rq_reqmsg),
3228                                   lwi);
3229                 LASSERT(rc == 0 || rc == -ETIMEDOUT);
3230                 /* Wait again if we changed rq_deadline. */
3231                 rq_deadline = ACCESS_ONCE(req->rq_deadline);
3232                 deadline = start + bulk_timeout;
3233                 if (deadline > rq_deadline)
3234                         deadline = rq_deadline;
3235         } while ((rc == -ETIMEDOUT) &&
3236                  (deadline > cfs_time_current_sec()));
3237
3238         if (rc == -ETIMEDOUT) {
3239                 DEBUG_REQ(D_ERROR, req, "timeout on bulk %s after %ld%+lds",
3240                           bulk2type(req), deadline - start,
3241                           cfs_time_current_sec() - deadline);
3242                 ptlrpc_abort_bulk(desc);
3243         } else if (exp->exp_failed) {
3244                 DEBUG_REQ(D_ERROR, req, "Eviction on bulk %s",
3245                           bulk2type(req));
3246                 rc = -ENOTCONN;
3247                 ptlrpc_abort_bulk(desc);
3248         } else if (exp->exp_conn_cnt >
3249                    lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3250                 DEBUG_REQ(D_ERROR, req, "Reconnect on bulk %s",
3251                           bulk2type(req));
3252                 /* We don't reply anyway. */
3253                 rc = -ETIMEDOUT;
3254                 ptlrpc_abort_bulk(desc);
3255         } else if (desc->bd_failure) {
3256                 DEBUG_REQ(D_ERROR, req, "network error on bulk %s",
3257                           bulk2type(req));
3258                 /* XXX should this be a different errno? */
3259                 rc = -ETIMEDOUT;
3260         } else {
3261                 if (req->rq_bulk_write)
3262                         rc = sptlrpc_svc_unwrap_bulk(req, desc);
3263                 if (rc == 0 && desc->bd_nob_transferred != desc->bd_nob) {
3264                         DEBUG_REQ(D_ERROR, req, "truncated bulk %s %d(%d)",
3265                                   bulk2type(req), desc->bd_nob_transferred,
3266                                   desc->bd_nob);
3267                         /* XXX should this be a different errno? */
3268                         rc = -ETIMEDOUT;
3269                 }
3270         }
3271
3272         RETURN(rc);
3273 }
3274 EXPORT_SYMBOL(target_bulk_io);
3275
3276 #endif /* HAVE_SERVER_SUPPORT */