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_waitqueue_head(&cli->cl_destroy_waitq);
 395         atomic_set(&cli->cl_destroy_in_flight, 0);
 396 #ifdef ENABLE_CHECKSUM
 397         /* Turn on checksumming by default. */
 398         cli->cl_checksum = 1;
 399         /*
 400          * The supported checksum types will be worked out at connect time
 401          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 402          * through procfs.
 403          */
 404         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 405 #endif
 406         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 407
 408         /* Set it to possible maximum size. It may be reduced by ocd_brw_size
 409          * from OFD after connecting. */
 410         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 411
 412         /* set cl_chunkbits default value to PAGE_SHIFT,
 413          * it will be updated at OSC connection time. */
 414         cli->cl_chunkbits = PAGE_SHIFT;
 415
 416         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 417                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 418         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
 419                 cli->cl_max_rpcs_in_flight = 2;
 420         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
 421                 cli->cl_max_rpcs_in_flight = 3;
 422         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
 423                 cli->cl_max_rpcs_in_flight = 4;
 424         } else {
 425                 if (osc_on_mdt(obddev->obd_name))
 426                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
 427                 else
 428                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 429         }
 430
 431         spin_lock_init(&cli->cl_mod_rpcs_lock);
 432         spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
 433         cli->cl_max_mod_rpcs_in_flight = 0;
 434         cli->cl_mod_rpcs_in_flight = 0;
 435         cli->cl_close_rpcs_in_flight = 0;
 436         init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
 437         cli->cl_mod_tag_bitmap = NULL;
 438
 439         if (connect_op == MDS_CONNECT) {
 440                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
 441                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
 442                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 443                 if (cli->cl_mod_tag_bitmap == NULL)
 444                         GOTO(err, rc = -ENOMEM);
 445         }
 446
 447         rc = ldlm_get_ref();
 448         if (rc) {
 449                 CERROR("ldlm_get_ref failed: %d\n", rc);
 450                 GOTO(err, rc);
 451         }
 452
 453         ptlrpc_init_client(rq_portal, rp_portal, name,
 454                            &obddev->obd_ldlm_client);
 455
 456         imp = class_new_import(obddev);
 457         if (imp == NULL)
 458                 GOTO(err_ldlm, rc = -ENOENT);
 459         imp->imp_client = &obddev->obd_ldlm_client;
 460         imp->imp_connect_op = connect_op;
 461         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 462                LUSTRE_CFG_BUFLEN(lcfg, 1));
 463         class_import_put(imp);
 464
 465         if (lustre_cfg_buf(lcfg, 4)) {
 466                 __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
 467
 468                 if (refnet == LNET_NIDNET(LNET_NID_ANY)) {
 469                         rc = -EINVAL;
 470                         CERROR("%s: bad mount option 'network=%s': rc = %d\n",
 471                                obddev->obd_name, lustre_cfg_string(lcfg, 4),
 472                                rc);
 473                         GOTO(err_import, rc);
 474                 }
 475                 fake_conn.c_self = LNET_MKNID(refnet, 0);
 476                 imp->imp_connection = &fake_conn;
 477         }
 478
 479         rc = client_import_add_conn(imp, &server_uuid, 1);
 480         if (rc) {
 481                 CERROR("can't add initial connection\n");
 482                 GOTO(err_import, rc);
 483         }
 484         imp->imp_connection = NULL;
 485
 486         cli->cl_import = imp;
 487         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
 488         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 489
 490         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 491                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 492                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 493                                name, obddev->obd_name,
 494                                cli->cl_target_uuid.uuid);
 495                         spin_lock(&imp->imp_lock);
 496                         imp->imp_deactive = 1;
 497                         spin_unlock(&imp->imp_lock);
 498                 }
 499         }
 500
 501         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 502                                                    LDLM_NAMESPACE_CLIENT,
 503                                                    LDLM_NAMESPACE_GREEDY,
 504                                                    ns_type);
 505         if (obddev->obd_namespace == NULL) {
 506                 CERROR("Unable to create client namespace - %s\n",
 507                        obddev->obd_name);
 508                 GOTO(err_import, rc = -ENOMEM);
 509         }
 510
 511         RETURN(rc);
 512
 513 err_import:
 514         class_destroy_import(imp);
 515 err_ldlm:
 516         ldlm_put_ref();
 517 err:
 518         if (cli->cl_mod_tag_bitmap != NULL)
 519                 OBD_FREE(cli->cl_mod_tag_bitmap,
 520                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 521         cli->cl_mod_tag_bitmap = NULL;
 522         RETURN(rc);
 523
 524 }
 525 EXPORT_SYMBOL(client_obd_setup);
 526
 527 int client_obd_cleanup(struct obd_device *obddev)
 528 {
 529         struct client_obd *cli = &obddev->u.cli;
 530         ENTRY;
 531
 532         ldlm_namespace_free_post(obddev->obd_namespace);
 533         obddev->obd_namespace = NULL;
 534
 535         obd_cleanup_client_import(obddev);
 536         LASSERT(obddev->u.cli.cl_import == NULL);
 537
 538         ldlm_put_ref();
 539
 540         if (cli->cl_mod_tag_bitmap != NULL)
 541                 OBD_FREE(cli->cl_mod_tag_bitmap,
 542                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 543         cli->cl_mod_tag_bitmap = NULL;
 544
 545         RETURN(0);
 546 }
 547 EXPORT_SYMBOL(client_obd_cleanup);
 548
 549 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 550 int client_connect_import(const struct lu_env *env,
 551                           struct obd_export **exp,
 552                           struct obd_device *obd, struct obd_uuid *cluuid,
 553                           struct obd_connect_data *data, void *localdata)
 554 {
 555         struct client_obd       *cli    = &obd->u.cli;
 556         struct obd_import       *imp    = cli->cl_import;
 557         struct obd_connect_data *ocd;
 558         struct lustre_handle    conn    = { 0 };
 559         int                     rc;
 560         ENTRY;
 561
 562         *exp = NULL;
 563         down_write(&cli->cl_sem);
 564         if (cli->cl_conn_count > 0)
 565                 GOTO(out_sem, rc = -EALREADY);
 566
 567         rc = class_connect(&conn, obd, cluuid);
 568         if (rc)
 569                 GOTO(out_sem, rc);
 570
 571         cli->cl_conn_count++;
 572         *exp = class_conn2export(&conn);
 573
 574         LASSERT(obd->obd_namespace);
 575
 576         imp->imp_dlm_handle = conn;
 577         rc = ptlrpc_init_import(imp);
 578         if (rc != 0)
 579                 GOTO(out_ldlm, rc);
 580
 581         ocd = &imp->imp_connect_data;
 582         if (data) {
 583                 *ocd = *data;
 584                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 585                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
 586         }
 587
 588         rc = ptlrpc_connect_import(imp);
 589         if (rc != 0) {
 590                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 591                 GOTO(out_ldlm, rc);
 592         }
 593         LASSERT(*exp != NULL && (*exp)->exp_connection);
 594
 595         if (data) {
 596                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 597                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 598                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 599                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 600         }
 601
 602         ptlrpc_pinger_add_import(imp);
 603
 604         EXIT;
 605
 606         if (rc) {
 607 out_ldlm:
 608                 cli->cl_conn_count--;
 609                 class_disconnect(*exp);
 610                 *exp = NULL;
 611         }
 612 out_sem:
 613         up_write(&cli->cl_sem);
 614
 615         return rc;
 616 }
 617 EXPORT_SYMBOL(client_connect_import);
 618
 619 int client_disconnect_export(struct obd_export *exp)
 620 {
 621         struct obd_device *obd = class_exp2obd(exp);
 622         struct client_obd *cli;
 623         struct obd_import *imp;
 624         int rc = 0, err;
 625         ENTRY;
 626
 627         if (!obd) {
 628                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 629                        exp, exp ? exp->exp_handle.h_cookie : -1);
 630                 RETURN(-EINVAL);
 631         }
 632
 633         cli = &obd->u.cli;
 634         imp = cli->cl_import;
 635
 636         down_write(&cli->cl_sem);
 637         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
 638                 cli->cl_conn_count);
 639
 640         if (cli->cl_conn_count == 0) {
 641                 CERROR("disconnecting disconnected device (%s)\n",
 642                        obd->obd_name);
 643                 GOTO(out_disconnect, rc = -EINVAL);
 644         }
 645
 646         cli->cl_conn_count--;
 647         if (cli->cl_conn_count != 0)
 648                 GOTO(out_disconnect, rc = 0);
 649
 650         /* Mark import deactivated now, so we don't try to reconnect if any
 651          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 652          * fully deactivate the import, or that would drop all requests. */
 653         spin_lock(&imp->imp_lock);
 654         imp->imp_deactive = 1;
 655         spin_unlock(&imp->imp_lock);
 656
 657         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 658          * delete it regardless.  (It's safe to delete an import that was
 659          * never added.) */
 660         (void)ptlrpc_pinger_del_import(imp);
 661
 662         if (obd->obd_namespace != NULL) {
 663                 /* obd_force == local only */
 664                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 665                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 666                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 667         }
 668
 669         /* There's no need to hold sem while disconnecting an import,
 670          * and it may actually cause deadlock in GSS. */
 671         up_write(&cli->cl_sem);
 672         rc = ptlrpc_disconnect_import(imp, 0);
 673         down_write(&cli->cl_sem);
 674
 675         ptlrpc_invalidate_import(imp);
 676
 677         EXIT;
 678
 679 out_disconnect:
 680         /* Use server style - class_disconnect should be always called for
 681          * o_disconnect. */
 682         err = class_disconnect(exp);
 683         if (!rc && err)
 684                 rc = err;
 685
 686         up_write(&cli->cl_sem);
 687
 688         RETURN(rc);
 689 }
 690 EXPORT_SYMBOL(client_disconnect_export);
 691
 692 #ifdef HAVE_SERVER_SUPPORT
 693 int server_disconnect_export(struct obd_export *exp)
 694 {
 695         int rc;
 696         ENTRY;
 697
 698         /* Disconnect early so that clients can't keep using export. */
 699         rc = class_disconnect(exp);
 700         /* Close import to avoid sending any requests. */
 701         if (exp->exp_imp_reverse)
 702                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 703
 704         ldlm_bl_thread_wakeup();
 705
 706         /* complete all outstanding replies */
 707         spin_lock(&exp->exp_lock);
 708         while (!list_empty(&exp->exp_outstanding_replies)) {
 709                 struct ptlrpc_reply_state *rs =
 710                         list_entry(exp->exp_outstanding_replies.next,
 711                                        struct ptlrpc_reply_state, rs_exp_list);
 712                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 713
 714                 spin_lock(&svcpt->scp_rep_lock);
 715
 716                 list_del_init(&rs->rs_exp_list);
 717                 spin_lock(&rs->rs_lock);
 718                 ptlrpc_schedule_difficult_reply(rs);
 719                 spin_unlock(&rs->rs_lock);
 720
 721                 spin_unlock(&svcpt->scp_rep_lock);
 722         }
 723         spin_unlock(&exp->exp_lock);
 724
 725         RETURN(rc);
 726 }
 727 EXPORT_SYMBOL(server_disconnect_export);
 728
 729 /* --------------------------------------------------------------------------
 730  * from old lib/target.c
 731  * -------------------------------------------------------------------------- */
 732
 733 static int target_handle_reconnect(struct lustre_handle *conn,
 734                                    struct obd_export *exp,
 735                                    struct obd_uuid *cluuid)
 736 {
 737         struct obd_device *target;
 738         struct lustre_handle *hdl;
 739         cfs_time_t now;
 740         cfs_time_t deadline;
 741         int timeout;
 742         int rc = 0;
 743         ENTRY;
 744
 745         hdl = &exp->exp_imp_reverse->imp_remote_handle;
 746         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
 747                 conn->cookie = exp->exp_handle.h_cookie;
 748                 CDEBUG(D_HA, "connect export for UUID '%s' at %p,"
 749                        " cookie %#llx\n", cluuid->uuid, exp, conn->cookie);
 750                 RETURN(0);
 751         }
 752
 753         target = exp->exp_obd;
 754
 755         /* Might be a re-connect after a partition. */
 756         if (memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 757                 LCONSOLE_WARN("%s: already connected client %s (at %s) "
 758                               "with handle %#llx. Rejecting client "
 759                               "with the same UUID trying to reconnect "
 760                               "with handle %#llx\n", target->obd_name,
 761                               obd_uuid2str(&exp->exp_client_uuid),
 762                               obd_export_nid2str(exp),
 763                               hdl->cookie, conn->cookie);
 764                 memset(conn, 0, sizeof *conn);
 765                 /* target_handle_connect() treats EALREADY and
 766                  * -EALREADY differently.  -EALREADY is an error
 767                  * (same UUID, different handle). */
 768                 RETURN(-EALREADY);
 769         }
 770
 771         if (!target->obd_recovering) {
 772                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
 773                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
 774                         obd_export_nid2str(exp));
 775                 GOTO(out_already, rc);
 776         }
 777
 778         now = cfs_time_current();
 779         deadline = target->obd_recovery_timer.expires;
 780         if (cfs_time_before(now, deadline)) {
 781                 struct target_distribute_txn_data *tdtd =
 782                                         class_exp2tgt(exp)->lut_tdtd;
 783                 int size = 0;
 784                 int count = 0;
 785                 char *buf = NULL;
 786
 787                 timeout = cfs_duration_sec(cfs_time_sub(deadline, now));
 788                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
 789                         buf = tdtd->tdtd_show_update_logs_retrievers(
 790                                 tdtd->tdtd_show_retrievers_cbdata,
 791                                 &size, &count);
 792
 793                 if (count > 0)
 794                         LCONSOLE_WARN("%s: Recovery already passed deadline "
 795                                       "%d:%.02d. It is due to DNE recovery "
 796                                       "failed/stuck on the %d MDT(s):%s. "
 797                                       "Please wait until all MDTs recovered "
 798                                       "or abort the recovery by force.\n",
 799                                       target->obd_name, timeout / 60,
 800                                       timeout % 60, count,
 801                                       buf ? buf : "unknown (not enough RAM)");
 802                 else
 803                         LCONSOLE_WARN("%s: Recovery already passed deadline "
 804                                       "%d:%.02d. If you do not want to wait "
 805                                       "more, please abort the recovery by "
 806                                       "force.\n", target->obd_name,
 807                                       timeout / 60, timeout % 60);
 808
 809                 if (buf != NULL)
 810                         OBD_FREE(buf, size);
 811         } else {
 812                 timeout = cfs_duration_sec(cfs_time_sub(now, deadline));
 813                 LCONSOLE_WARN("%s: Recovery already passed deadline"
 814                         " %d:%.02d, It is most likely due to DNE"
 815                         " recovery is failed or stuck, please wait a"
 816                         " few more minutes or abort the recovery.\n",
 817                         target->obd_name, timeout / 60, timeout % 60);
 818         }
 819
 820 out_already:
 821         conn->cookie = exp->exp_handle.h_cookie;
 822         /* target_handle_connect() treats EALREADY and
 823          * -EALREADY differently.  EALREADY means we are
 824          * doing a valid reconnect from the same client. */
 825         RETURN(EALREADY);
 826 }
 827
 828 static void
 829 check_and_start_recovery_timer(struct obd_device *obd,
 830                                struct ptlrpc_request *req, int new_client);
 831
 832 /**
 833  * update flags for import during reconnect process
 834  */
 835 static int rev_import_flags_update(struct obd_import *revimp,
 836                                    struct ptlrpc_request *req)
 837 {
 838         int rc;
 839         struct obd_connect_data *data;
 840
 841         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 842
 843         if (data->ocd_connect_flags & OBD_CONNECT_AT)
 844                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 845         else
 846                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 847
 848         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
 849
 850         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
 851         if (rc) {
 852                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
 853                         revimp->imp_client->cli_name,
 854                         libcfs_id2str(req->rq_peer), rc);
 855                 return rc;
 856         }
 857
 858         return 0;
 859 }
 860
 861 /**
 862  * Allocate a new reverse import for an export.
 863  *
 864  * \retval -errno in case error hit
 865  * \retval 0 if reverse import correctly init
 866  **/
 867 int rev_import_init(struct obd_export *export)
 868 {
 869         struct obd_device *obd = export->exp_obd;
 870         struct obd_import *revimp;
 871
 872         LASSERT(export->exp_imp_reverse == NULL);
 873
 874         revimp = class_new_import(obd);
 875         if (revimp == NULL)
 876                 return -ENOMEM;
 877
 878         revimp->imp_remote_handle.cookie = 0ULL;
 879         revimp->imp_client = &obd->obd_ldlm_client;
 880         revimp->imp_dlm_fake = 1;
 881
 882         /* it is safe to connect import in new state as no sends possible */
 883         spin_lock(&export->exp_lock);
 884         export->exp_imp_reverse = revimp;
 885         spin_unlock(&export->exp_lock);
 886         class_import_put(revimp);
 887
 888         return 0;
 889 }
 890 EXPORT_SYMBOL(rev_import_init);
 891
 892 /**
 893  * Handle reconnect for an export.
 894  *
 895  * \param exp export to handle reconnect process
 896  * \param req client reconnect request
 897  *
 898  * \retval -rc in case securitfy flavor can't be changed
 899  * \retval 0 in case none problems
 900  */
 901 static int rev_import_reconnect(struct obd_export *exp,
 902                                 struct ptlrpc_request *req)
 903 {
 904         struct obd_import *revimp = exp->exp_imp_reverse;
 905         struct lustre_handle *lh;
 906         int rc;
 907
 908         /* avoid sending a request until import flags are changed */
 909         ptlrpc_import_enter_resend(revimp);
 910
 911         if (revimp->imp_connection != NULL)
 912                 ptlrpc_connection_put(revimp->imp_connection);
 913
 914         /*
 915          * client from recovery don't have a handle so we need to take from
 916          * request. it may produce situation when wrong client connected
 917          * to recovery as we trust a client uuid
 918          */
 919         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 920         revimp->imp_remote_handle = *lh;
 921
 922         /* unknown versions will be caught in
 923          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
 924         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
 925
 926         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
 927
 928         rc = rev_import_flags_update(revimp, req);
 929         if (rc != 0) {
 930                 /* it is safe to still be in RECOVERY phase as we are not able
 931                  * to setup correct security flavor so requests are not able to
 932                  * be delivered correctly */
 933                 return rc;
 934         }
 935
 936         /* resend all rpc's via new connection */
 937         return ptlrpc_import_recovery_state_machine(revimp);
 938 }
 939
 940 int target_handle_connect(struct ptlrpc_request *req)
 941 {
 942         struct obd_device *target = NULL;
 943         struct obd_export *export = NULL;
 944         /* connect handle - filled from target_handle_reconnect in
 945          * reconnect case */
 946         struct lustre_handle conn;
 947         struct lustre_handle *tmp;
 948         struct obd_uuid tgtuuid;
 949         struct obd_uuid cluuid;
 950         char *str;
 951         int rc = 0;
 952         char *target_start;
 953         int target_len;
 954         bool     mds_conn = false, lw_client = false, initial_conn = false;
 955         bool     mds_mds_conn = false;
 956         bool     new_mds_mds_conn = false;
 957         bool     target_referenced = false;
 958         struct obd_connect_data *data, *tmpdata;
 959         int size, tmpsize;
 960         lnet_nid_t *client_nid = NULL;
 961         ENTRY;
 962
 963         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 964
 965         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 966         if (str == NULL) {
 967                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 968                 GOTO(out, rc = -EINVAL);
 969         }
 970
 971         obd_str2uuid(&tgtuuid, str);
 972         target = class_uuid2obd(&tgtuuid);
 973         if (!target)
 974                 target = class_name2obd(str);
 975
 976         if (!target) {
 977                 deuuidify(str, NULL, &target_start, &target_len);
 978                 LCONSOLE_ERROR_MSG(0x137, "%s: not available for connect "
 979                                    "from %s (no target). If you are running "
 980                                    "an HA pair check that the target is "
 981                                    "mounted on the other server.\n", str,
 982                                    libcfs_nid2str(req->rq_peer.nid));
 983                 GOTO(out, rc = -ENODEV);
 984         }
 985
 986         spin_lock(&target->obd_dev_lock);
 987         if (target->obd_stopping || !target->obd_set_up) {
 988                 spin_unlock(&target->obd_dev_lock);
 989
 990                 deuuidify(str, NULL, &target_start, &target_len);
 991                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
 992                               target_len, target_start,
 993                               libcfs_nid2str(req->rq_peer.nid),
 994                               (target->obd_stopping ?
 995                                "stopping" : "not set up"));
 996                 GOTO(out, rc = -ENODEV);
 997         }
 998
 999         if (target->obd_no_conn) {
1000                 spin_unlock(&target->obd_dev_lock);
1001
1002                 CDEBUG(D_INFO, "%s: Temporarily refusing client connection "
1003                                "from %s\n", target->obd_name,
1004                                libcfs_nid2str(req->rq_peer.nid));
1005                 GOTO(out, rc = -EAGAIN);
1006         }
1007
1008         /* Make sure the target isn't cleaned up while we're here. Yes,
1009          * there's still a race between the above check and our incref here.
1010          * Really, class_uuid2obd should take the ref. */
1011         class_incref(target, __func__, current);
1012         target_referenced = true;
1013
1014         target->obd_conn_inprogress++;
1015         spin_unlock(&target->obd_dev_lock);
1016
1017         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1018         if (str == NULL) {
1019                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1020                 GOTO(out, rc = -EINVAL);
1021         }
1022
1023         obd_str2uuid(&cluuid, str);
1024
1025         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1026         if (tmp == NULL)
1027                 GOTO(out, rc = -EPROTO);
1028
1029         conn = *tmp;
1030
1031         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1032                                     RCL_CLIENT);
1033         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1034         if (!data)
1035                 GOTO(out, rc = -EPROTO);
1036
1037         rc = req_capsule_server_pack(&req->rq_pill);
1038         if (rc)
1039                 GOTO(out, rc);
1040
1041 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1042         /* Don't allow clients to connect that are using old 1.8 format
1043          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1044          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1045          * FULL20 flag should be set on all connections since 2.0, but no
1046          * longer affects behaviour.
1047          *
1048          * Later this check will be disabled and the flag can be retired
1049          * completely once interop with 3.0 is no longer needed.
1050          */
1051         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1052                 GOTO(out, rc = -EPROTO);
1053 #endif
1054
1055         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1056                 if (data->ocd_version < LUSTRE_VERSION_CODE -
1057                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
1058                     data->ocd_version > LUSTRE_VERSION_CODE +
1059                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
1060                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
1061                                   "libclient connection attempt",
1062                                   data->ocd_version < LUSTRE_VERSION_CODE ?
1063                                   "old" : "new",
1064                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
1065                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
1066                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
1067                                   OBD_OCD_VERSION_FIX(data->ocd_version));
1068                         data = req_capsule_server_sized_get(&req->rq_pill,
1069                                                             &RMF_CONNECT_DATA,
1070                                     offsetof(typeof(*data), ocd_version) +
1071                                              sizeof(data->ocd_version));
1072                         if (data) {
1073                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
1074                                 data->ocd_version = LUSTRE_VERSION_CODE;
1075                         }
1076                         GOTO(out, rc = -EPROTO);
1077                 }
1078         }
1079
1080         /* Note: lw_client is needed in MDS-MDS failover during update log
1081          * processing, so we needs to allow lw_client to be connected at
1082          * anytime, instead of only the initial connection */
1083         lw_client = (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0;
1084
1085         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1086                 initial_conn = true;
1087                 mds_conn = (data->ocd_connect_flags & OBD_CONNECT_MDS) != 0;
1088                 mds_mds_conn = (data->ocd_connect_flags &
1089                                 OBD_CONNECT_MDS_MDS) != 0;
1090
1091                 /* OBD_CONNECT_MNE_SWAB is defined as OBD_CONNECT_MDS_MDS
1092                  * for Imperative Recovery connection from MGC to MGS.
1093                  *
1094                  * Via check OBD_CONNECT_FID, we can distinguish whether
1095                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1096                  * MGC or MDT. */
1097                 if (!lw_client &&
1098                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1099                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1100                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1101                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1102                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1103                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1104
1105                         /* We do not support the MDT-MDT interoperations with
1106                          * different version MDT because of protocol changes. */
1107                         if (unlikely(major != LUSTRE_MAJOR ||
1108                                      minor != LUSTRE_MINOR ||
1109                                      abs(patch - LUSTRE_PATCH) > 3)) {
1110                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the "
1111                                         "connection from different version MDT "
1112                                         "(%d.%d.%d.%d) %s %s\n",
1113                                         target->obd_name, LUSTRE_MAJOR,
1114                                         LUSTRE_MINOR, LUSTRE_PATCH, LUSTRE_FIX,
1115                                         major, minor, patch,
1116                                         OBD_OCD_VERSION_FIX(data->ocd_version),
1117                                         libcfs_nid2str(req->rq_peer.nid), str);
1118
1119                                 GOTO(out, rc = -EPROTO);
1120                         }
1121                 }
1122         }
1123
1124         /* lctl gets a backstage, all-access pass. */
1125         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1126                 goto dont_check_exports;
1127
1128         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
1129         if (!export)
1130                 goto no_export;
1131
1132         /* We've found an export in the hash. */
1133
1134         spin_lock(&export->exp_lock);
1135
1136         if (export->exp_connecting) { /* bug 9635, et. al. */
1137                 spin_unlock(&export->exp_lock);
1138                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1139                               export->exp_obd->obd_name, export,
1140                               libcfs_nid2str(req->rq_peer.nid));
1141                 class_export_put(export);
1142                 export = NULL;
1143                 rc = -EALREADY;
1144         } else if ((mds_conn || (lw_client && initial_conn) ||
1145                    data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1146                    export->exp_connection != NULL) {
1147                 spin_unlock(&export->exp_lock);
1148                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1149                         /* MDS or LWP reconnected after failover. */
1150                         LCONSOLE_WARN("%s: Received %s connection from "
1151                             "%s, removing former export from %s\n",
1152                             target->obd_name, mds_conn ? "MDS" : "LWP",
1153                             libcfs_nid2str(req->rq_peer.nid),
1154                             libcfs_nid2str(export->exp_connection->c_peer.nid));
1155                 } else {
1156                         /* New MDS connection from the same NID. */
1157                         LCONSOLE_WARN("%s: Received new %s connection from "
1158                                 "%s, removing former export from same NID\n",
1159                                 target->obd_name, mds_conn ? "MDS" : "LWP",
1160                                 libcfs_nid2str(req->rq_peer.nid));
1161                 }
1162
1163                 if (req->rq_peer.nid == export->exp_connection->c_peer.nid &&
1164                     data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
1165                         /* Because exports between MDTs will always be
1166                          * kept, let's do not fail such export if they
1167                          * come from the same NID, otherwise it might
1168                          * cause eviction between MDTs, which might
1169                          * cause namespace inconsistency */
1170                         spin_lock(&export->exp_lock);
1171                         export->exp_connecting = 1;
1172                         spin_unlock(&export->exp_lock);
1173                         conn.cookie = export->exp_handle.h_cookie;
1174                         rc = EALREADY;
1175                 } else {
1176                         class_fail_export(export);
1177                         class_export_put(export);
1178                         export = NULL;
1179                         rc = 0;
1180                 }
1181         } else if (export->exp_connection != NULL && initial_conn &&
1182                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1183                 spin_unlock(&export->exp_lock);
1184                 /* In MDS failover we have static UUID but NID can change. */
1185                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when "
1186                               "existing nid %s is already connected\n",
1187                               target->obd_name, cluuid.uuid,
1188                               libcfs_nid2str(req->rq_peer.nid),
1189                               libcfs_nid2str(
1190                                       export->exp_connection->c_peer.nid));
1191                 rc = -EALREADY;
1192                 class_export_put(export);
1193                 export = NULL;
1194         } else {
1195                 export->exp_connecting = 1;
1196                 spin_unlock(&export->exp_lock);
1197                 LASSERT(export->exp_obd == target);
1198
1199                 rc = target_handle_reconnect(&conn, export, &cluuid);
1200         }
1201
1202         /* If we found an export, we already unlocked. */
1203         if (!export) {
1204 no_export:
1205                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1206         } else if (req->rq_export == NULL &&
1207                    atomic_read(&export->exp_rpc_count) > 0) {
1208                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, "
1209                               "still busy with %d references\n",
1210                               target->obd_name, cluuid.uuid,
1211                               libcfs_nid2str(req->rq_peer.nid),
1212                               atomic_read(&export->exp_refcount));
1213                 GOTO(out, rc = -EBUSY);
1214         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
1215                 if (!strstr(cluuid.uuid, "mdt"))
1216                         LCONSOLE_WARN("%s: Rejecting reconnect from the "
1217                                       "known client %s (at %s) because it "
1218                                       "is indicating it is a new client",
1219                                       target->obd_name, cluuid.uuid,
1220                                       libcfs_nid2str(req->rq_peer.nid));
1221                 GOTO(out, rc = -EALREADY);
1222         } else {
1223                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1224         }
1225
1226         if (rc < 0) {
1227                 GOTO(out, rc);
1228         }
1229
1230         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %ld last %ld\n",
1231                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1232               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1233               export, (long)cfs_time_current_sec(),
1234               export ? (long)export->exp_last_request_time : 0);
1235
1236         /* If this is the first time a client connects, reset the recovery
1237          * timer. Discard lightweight connections which might be local. */
1238         if (!lw_client && rc == 0 && target->obd_recovering)
1239                 check_and_start_recovery_timer(target, req, export == NULL);
1240
1241         /* We want to handle EALREADY but *not* -EALREADY from
1242          * target_handle_reconnect(), return reconnection state in a flag. */
1243         if (rc == EALREADY) {
1244                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1245                 rc = 0;
1246         } else {
1247                 LASSERT(rc == 0);
1248         }
1249
1250         /* Tell the client if we support replayable requests. */
1251         if (target->obd_replayable)
1252                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1253         client_nid = &req->rq_peer.nid;
1254
1255         if (export == NULL) {
1256                 /* allow lightweight connections during recovery */
1257                 /* allow "new" MDT to be connected during recovery, since we
1258                  * need retrieve recovery update records from it */
1259                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1260                         cfs_time_t t;
1261                         int     c; /* connected */
1262                         int     i; /* in progress */
1263                         int     k; /* known */
1264                         int     s; /* stale/evicted */
1265
1266                         c = atomic_read(&target->obd_connected_clients);
1267                         i = atomic_read(&target->obd_lock_replay_clients);
1268                         k = target->obd_max_recoverable_clients;
1269                         s = target->obd_stale_clients;
1270                         t = target->obd_recovery_timer.expires;
1271                         t = cfs_time_sub(t, cfs_time_current());
1272                         t = cfs_duration_sec(t);
1273                         LCONSOLE_WARN("%s: Denying connection for new client %s"
1274                                       "(at %s), waiting for %d known clients "
1275                                       "(%d recovered, %d in progress, and %d "
1276                                       "evicted) to recover in %d:%.02d\n",
1277                                       target->obd_name, cluuid.uuid,
1278                                       libcfs_nid2str(req->rq_peer.nid), k,
1279                                       c - i, i, s, (int)t / 60,
1280                                       (int)t % 60);
1281                         rc = -EBUSY;
1282                 } else {
1283 dont_check_exports:
1284                         rc = obd_connect(req->rq_svc_thread->t_env,
1285                                          &export, target, &cluuid, data,
1286                                          client_nid);
1287                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1288                                 lustre_msg_add_op_flags(req->rq_repmsg,
1289                                                         MSG_CONNECT_RECOVERING);
1290                         if (rc == 0) {
1291                                 conn.cookie = export->exp_handle.h_cookie;
1292                                 rc = rev_import_init(export);
1293                         }
1294
1295                         if (mds_mds_conn)
1296                                 new_mds_mds_conn = true;
1297                 }
1298         } else {
1299                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1300                                    export, target, &cluuid, data, client_nid);
1301         }
1302         if (rc)
1303                 GOTO(out, rc);
1304
1305         LASSERT(target->u.obt.obt_magic == OBT_MAGIC);
1306         data->ocd_instance = target->u.obt.obt_instance;
1307
1308         /* Return only the parts of obd_connect_data that we understand, so the
1309          * client knows that we don't understand the rest. */
1310         if (data) {
1311                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1312                                                RCL_SERVER);
1313                 tmpdata = req_capsule_server_get(&req->rq_pill,
1314                                                  &RMF_CONNECT_DATA);
1315                 /* Don't use struct assignment here, because the client reply
1316                  * buffer may be smaller/larger than the local struct
1317                  * obd_connect_data. */
1318                 memcpy(tmpdata, data, min(tmpsize, size));
1319         }
1320
1321         /* If the client and the server are the same node, we will already
1322          * have an export that really points to the client's DLM export,
1323          * because we have a shared handles table.
1324          *
1325          * XXX this will go away when shaver stops sending the "connect" handle
1326          * in the real "remote handle" field of the request --phik 24 Apr 2003
1327          */
1328         ptlrpc_request_change_export(req, export);
1329
1330         spin_lock(&export->exp_lock);
1331         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1332                 spin_unlock(&export->exp_lock);
1333                 CDEBUG(D_RPCTRACE, "%s: %s already connected at greater "
1334                        "or equal conn_cnt: %d >= %d\n",
1335                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1336                        export->exp_conn_cnt,
1337                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1338
1339                 GOTO(out, rc = -EALREADY);
1340         }
1341         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1342         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1343
1344         /* Don't evict liblustre clients for not pinging. */
1345         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1346                 export->exp_libclient = 1;
1347                 spin_unlock(&export->exp_lock);
1348
1349                 spin_lock(&target->obd_dev_lock);
1350                 list_del_init(&export->exp_obd_chain_timed);
1351                 spin_unlock(&target->obd_dev_lock);
1352         } else {
1353                 spin_unlock(&export->exp_lock);
1354         }
1355
1356         if (export->exp_connection != NULL) {
1357                 /* Check to see if connection came from another NID. */
1358                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
1359                     !hlist_unhashed(&export->exp_nid_hash))
1360                         cfs_hash_del(export->exp_obd->obd_nid_hash,
1361                                      &export->exp_connection->c_peer.nid,
1362                                      &export->exp_nid_hash);
1363
1364                 ptlrpc_connection_put(export->exp_connection);
1365         }
1366
1367         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
1368                                                        req->rq_self,
1369                                                        &cluuid);
1370         if (hlist_unhashed(&export->exp_nid_hash))
1371                 cfs_hash_add(export->exp_obd->obd_nid_hash,
1372                              &export->exp_connection->c_peer.nid,
1373                              &export->exp_nid_hash);
1374
1375         lustre_msg_set_handle(req->rq_repmsg, &conn);
1376
1377         rc = rev_import_reconnect(export, req);
1378         if (rc != 0)
1379                 GOTO(out, rc);
1380
1381         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1382                 int has_transno;
1383                 __u64 transno = data->ocd_transno;
1384
1385                 spin_lock(&export->exp_lock);
1386                 /* possible race with class_disconnect_stale_exports,
1387                  * export may be already in the eviction process */
1388                 if (export->exp_failed) {
1389                         spin_unlock(&export->exp_lock);
1390                         GOTO(out, rc = -ENODEV);
1391                 }
1392                 export->exp_in_recovery = 1;
1393                 export->exp_req_replay_needed = 1;
1394                 export->exp_lock_replay_needed = 1;
1395                 spin_unlock(&export->exp_lock);
1396
1397                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1398                                  MSG_CONNECT_TRANSNO);
1399                 if (has_transno && transno == 0)
1400                         CWARN("Connect with zero transno!\n");
1401
1402                 if (has_transno && transno > 0 &&
1403                     transno < target->obd_next_recovery_transno &&
1404                     transno > target->obd_last_committed) {
1405                         /* Another way is to use cmpxchg() to be lock-free. */
1406                         spin_lock(&target->obd_recovery_task_lock);
1407                         if (transno < target->obd_next_recovery_transno)
1408                                 target->obd_next_recovery_transno = transno;
1409                         spin_unlock(&target->obd_recovery_task_lock);
1410                 }
1411
1412                 atomic_inc(&target->obd_req_replay_clients);
1413                 atomic_inc(&target->obd_lock_replay_clients);
1414                 /* Note: MDS-MDS connection is allowed to be connected during
1415                  * recovery, no matter if the exports needs to be recoveried.
1416                  * Because we need retrieve updates logs from all other MDTs.
1417                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1418                  * also needs to be increased to match other recovery checking
1419                  * condition. */
1420                 if (new_mds_mds_conn)
1421                         target->obd_max_recoverable_clients++;
1422                 if (atomic_inc_return(&target->obd_connected_clients) ==
1423                     target->obd_max_recoverable_clients)
1424                         wake_up(&target->obd_next_transno_waitq);
1425         }
1426
1427         /* Tell the client we're in recovery, when client is involved in it. */
1428         if (target->obd_recovering && !lw_client)
1429                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1430
1431 out:
1432         if (export) {
1433                 spin_lock(&export->exp_lock);
1434                 export->exp_connecting = 0;
1435                 spin_unlock(&export->exp_lock);
1436
1437                 class_export_put(export);
1438         }
1439         if (target_referenced == true && target != NULL) {
1440                 spin_lock(&target->obd_dev_lock);
1441                 target->obd_conn_inprogress--;
1442                 spin_unlock(&target->obd_dev_lock);
1443
1444                 class_decref(target, __func__, current);
1445         }
1446         req->rq_status = rc;
1447         RETURN(rc);
1448 }
1449
1450 int target_handle_disconnect(struct ptlrpc_request *req)
1451 {
1452         int rc;
1453         ENTRY;
1454
1455         rc = req_capsule_server_pack(&req->rq_pill);
1456         if (rc)
1457                 RETURN(rc);
1458
1459         /* Keep the rq_export around so we can send the reply. */
1460         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1461
1462         RETURN(0);
1463 }
1464
1465 void target_destroy_export(struct obd_export *exp)
1466 {
1467         struct obd_import       *imp = NULL;
1468         /* exports created from last_rcvd data, and "fake"
1469            exports created by lctl don't have an import */
1470         spin_lock(&exp->exp_lock);
1471         if (exp->exp_imp_reverse != NULL) {
1472                 imp = exp->exp_imp_reverse;
1473                 exp->exp_imp_reverse = NULL;
1474         }
1475         spin_unlock(&exp->exp_lock);
1476         if (imp != NULL)
1477                 client_destroy_import(imp);
1478
1479         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1480         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1481         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1482         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1483 }
1484 EXPORT_SYMBOL(target_destroy_export);
1485
1486 /*
1487  * Recovery functions
1488  */
1489 static void target_request_copy_get(struct ptlrpc_request *req)
1490 {
1491         class_export_rpc_inc(req->rq_export);
1492         LASSERT(list_empty(&req->rq_list));
1493         INIT_LIST_HEAD(&req->rq_replay_list);
1494
1495         /* Increase refcount to keep request in queue. */
1496         atomic_inc(&req->rq_refcount);
1497         /* Let export know it has replays to be handled. */
1498         atomic_inc(&req->rq_export->exp_replay_count);
1499 }
1500
1501 static void target_request_copy_put(struct ptlrpc_request *req)
1502 {
1503         LASSERT(list_empty(&req->rq_replay_list));
1504         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1505
1506         atomic_dec(&req->rq_export->exp_replay_count);
1507         class_export_rpc_dec(req->rq_export);
1508         ptlrpc_server_drop_request(req);
1509 }
1510
1511 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1512 {
1513         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1514         struct obd_export     *exp = req->rq_export;
1515         struct ptlrpc_request *reqiter;
1516         struct ptlrpc_request *dup_req = NULL;
1517         int                    dup = 0;
1518
1519         LASSERT(exp);
1520
1521         spin_lock(&exp->exp_lock);
1522         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1523                                 rq_replay_list) {
1524                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1525                         dup_req = reqiter;
1526                         dup = 1;
1527                         break;
1528                 }
1529         }
1530
1531         if (dup) {
1532                 /* We expect it with RESENT and REPLAY flags. */
1533                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1534                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1535                         CERROR("invalid flags %x of resent replay\n",
1536                                lustre_msg_get_flags(req->rq_reqmsg));
1537
1538                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1539                         __u32 new_conn;
1540
1541                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1542                         if (new_conn >
1543                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1544                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1545                                                         new_conn);
1546                 }
1547         } else {
1548                 list_add_tail(&req->rq_replay_list,
1549                                   &exp->exp_req_replay_queue);
1550         }
1551
1552         spin_unlock(&exp->exp_lock);
1553         return dup;
1554 }
1555
1556 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1557 {
1558         LASSERT(!list_empty(&req->rq_replay_list));
1559         LASSERT(req->rq_export);
1560
1561         spin_lock(&req->rq_export->exp_lock);
1562         list_del_init(&req->rq_replay_list);
1563         spin_unlock(&req->rq_export->exp_lock);
1564 }
1565
1566 static void target_finish_recovery(struct lu_target *lut)
1567 {
1568         struct obd_device *obd = lut->lut_obd;
1569         ENTRY;
1570
1571         /* Only log a recovery message when recovery has occurred. */
1572         if (obd->obd_recovery_start) {
1573                 time64_t now = ktime_get_real_seconds();
1574                 time64_t elapsed_time;
1575
1576                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start, 1);
1577                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients "
1578                         "%d recovered and %d %s evicted.\n", obd->obd_name,
1579                         (s64)elapsed_time / 60, (s64)elapsed_time % 60,
1580                         obd->obd_max_recoverable_clients,
1581                         atomic_read(&obd->obd_connected_clients),
1582                         obd->obd_stale_clients,
1583                         obd->obd_stale_clients == 1 ? "was" : "were");
1584         }
1585
1586         ldlm_reprocess_recovery_done(obd->obd_namespace);
1587         spin_lock(&obd->obd_recovery_task_lock);
1588         if (!list_empty(&obd->obd_req_replay_queue) ||
1589             !list_empty(&obd->obd_lock_replay_queue) ||
1590             !list_empty(&obd->obd_final_req_queue)) {
1591                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1592                        obd->obd_name,
1593                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1594                        list_empty(&obd->obd_lock_replay_queue) ? \
1595                                "" : "lock ",
1596                        list_empty(&obd->obd_final_req_queue) ? \
1597                                "" : "final ");
1598                 spin_unlock(&obd->obd_recovery_task_lock);
1599                 LBUG();
1600         }
1601         spin_unlock(&obd->obd_recovery_task_lock);
1602
1603         obd->obd_recovery_end = ktime_get_real_seconds();
1604
1605         /* When recovery finished, cleanup orphans on MDS and OST. */
1606         if (OBT(obd) && OBP(obd, postrecov)) {
1607                 int rc = OBP(obd, postrecov)(obd);
1608                 if (rc < 0)
1609                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1610                                       obd->obd_name, rc);
1611         }
1612         EXIT;
1613 }
1614
1615 static void abort_req_replay_queue(struct obd_device *obd)
1616 {
1617         struct ptlrpc_request *req, *n;
1618         struct list_head abort_list;
1619
1620         INIT_LIST_HEAD(&abort_list);
1621         spin_lock(&obd->obd_recovery_task_lock);
1622         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1623         spin_unlock(&obd->obd_recovery_task_lock);
1624         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1625                 DEBUG_REQ(D_WARNING, req, "aborted:");
1626                 req->rq_status = -ENOTCONN;
1627                 if (ptlrpc_error(req)) {
1628                         DEBUG_REQ(D_ERROR, req,
1629                                   "failed abort_req_reply; skipping");
1630                 }
1631                 target_exp_dequeue_req_replay(req);
1632                 target_request_copy_put(req);
1633         }
1634 }
1635
1636 static void abort_lock_replay_queue(struct obd_device *obd)
1637 {
1638         struct ptlrpc_request *req, *n;
1639         struct list_head abort_list;
1640
1641         INIT_LIST_HEAD(&abort_list);
1642         spin_lock(&obd->obd_recovery_task_lock);
1643         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1644         spin_unlock(&obd->obd_recovery_task_lock);
1645         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1646                 DEBUG_REQ(D_ERROR, req, "aborted:");
1647                 req->rq_status = -ENOTCONN;
1648                 if (ptlrpc_error(req)) {
1649                         DEBUG_REQ(D_ERROR, req,
1650                                   "failed abort_lock_reply; skipping");
1651                 }
1652                 target_request_copy_put(req);
1653         }
1654 }
1655
1656 /* Called from a cleanup function if the device is being cleaned up
1657    forcefully.  The exports should all have been disconnected already,
1658    the only thing left to do is
1659      - clear the recovery flags
1660      - cancel the timer
1661      - free queued requests and replies, but don't send replies
1662    Because the obd_stopping flag is set, no new requests should be received.
1663
1664 */
1665 void target_cleanup_recovery(struct obd_device *obd)
1666 {
1667         struct ptlrpc_request *req, *n;
1668         struct list_head clean_list;
1669
1670         INIT_LIST_HEAD(&clean_list);
1671         spin_lock(&obd->obd_dev_lock);
1672         if (!obd->obd_recovering) {
1673                 spin_unlock(&obd->obd_dev_lock);
1674                 EXIT;
1675                 return;
1676         }
1677         obd->obd_recovering = obd->obd_abort_recovery = 0;
1678         spin_unlock(&obd->obd_dev_lock);
1679
1680         spin_lock(&obd->obd_recovery_task_lock);
1681         target_cancel_recovery_timer(obd);
1682         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1683         spin_unlock(&obd->obd_recovery_task_lock);
1684
1685         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1686                 LASSERT(req->rq_reply_state == NULL);
1687                 target_exp_dequeue_req_replay(req);
1688                 target_request_copy_put(req);
1689         }
1690
1691         spin_lock(&obd->obd_recovery_task_lock);
1692         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1693         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1694         spin_unlock(&obd->obd_recovery_task_lock);
1695
1696         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1697                 LASSERT(req->rq_reply_state == NULL);
1698                 target_request_copy_put(req);
1699         }
1700
1701         EXIT;
1702 }
1703 EXPORT_SYMBOL(target_cleanup_recovery);
1704
1705 /* obd_recovery_task_lock should be held */
1706 void target_cancel_recovery_timer(struct obd_device *obd)
1707 {
1708         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1709         del_timer(&obd->obd_recovery_timer);
1710 }
1711
1712 static void target_start_recovery_timer(struct obd_device *obd)
1713 {
1714         if (obd->obd_recovery_start != 0)
1715                 return;
1716
1717         spin_lock(&obd->obd_dev_lock);
1718         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1719                 spin_unlock(&obd->obd_dev_lock);
1720                 return;
1721         }
1722
1723         LASSERT(obd->obd_recovery_timeout != 0);
1724
1725         if (obd->obd_recovery_start != 0) {
1726                 spin_unlock(&obd->obd_dev_lock);
1727                 return;
1728         }
1729
1730         mod_timer(&obd->obd_recovery_timer,
1731                   cfs_time_shift(obd->obd_recovery_timeout));
1732         obd->obd_recovery_start = ktime_get_real_seconds();
1733         spin_unlock(&obd->obd_dev_lock);
1734
1735         LCONSOLE_WARN("%s: Will be in recovery for at least %llu:%02llu, or until %d client%s reconnect%s\n",
1736                       obd->obd_name,
1737                       obd->obd_recovery_timeout / 60,
1738                       obd->obd_recovery_timeout % 60,
1739                       obd->obd_max_recoverable_clients,
1740                       (obd->obd_max_recoverable_clients == 1) ? "" : "s",
1741                       (obd->obd_max_recoverable_clients == 1) ? "s": "");
1742 }
1743
1744 /**
1745  * extend recovery window.
1746  *
1747  * if @extend is true, extend recovery window to have @drt remaining at least;
1748  * otherwise, make sure the recovery timeout value is not less than @drt.
1749  */
1750 static void extend_recovery_timer(struct obd_device *obd, int drt,
1751                                   bool extend)
1752 {
1753         time64_t now;
1754         time64_t end;
1755         time64_t left;
1756         time64_t to;
1757
1758         spin_lock(&obd->obd_dev_lock);
1759         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1760                 spin_unlock(&obd->obd_dev_lock);
1761                 return;
1762         }
1763         LASSERT(obd->obd_recovery_start != 0);
1764
1765         now = ktime_get_real_seconds();
1766         to = obd->obd_recovery_timeout;
1767         end = obd->obd_recovery_start + to;
1768         left = end - now;
1769
1770         if (extend && (drt > left)) {
1771                 to += drt - left;
1772         } else if (!extend && (drt > to)) {
1773                 to = drt;
1774         }
1775
1776         if (to > obd->obd_recovery_time_hard) {
1777                 to = obd->obd_recovery_time_hard;
1778                 CWARN("%s: extended recovery timer reaching hard limit: %lld, extend: %d\n",
1779                       obd->obd_name, to, extend);
1780         }
1781
1782         if (obd->obd_recovery_timeout < to) {
1783                 obd->obd_recovery_timeout = to;
1784                 end = obd->obd_recovery_start + to;
1785                 mod_timer(&obd->obd_recovery_timer,
1786                           cfs_time_shift(end - now));
1787         }
1788         spin_unlock(&obd->obd_dev_lock);
1789
1790         CDEBUG(D_HA, "%s: recovery timer will expire in %lld seconds\n",
1791                 obd->obd_name, (s64)(end - now));
1792 }
1793
1794 /* Reset the timer with each new client connection */
1795 /*
1796  * This timer is actually reconnect_timer, which is for making sure
1797  * the total recovery window is at least as big as my reconnect
1798  * attempt timing. So the initial recovery time_out will be set to
1799  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1800  * from client is bigger than this, then the recovery time_out will
1801  * be extended to make sure the client could be reconnected, in the
1802  * process, the timeout from the new client should be ignored.
1803  */
1804
1805 static void
1806 check_and_start_recovery_timer(struct obd_device *obd,
1807                                struct ptlrpc_request *req,
1808                                int new_client)
1809 {
1810         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1811         struct obd_device_target *obt = &obd->u.obt;
1812
1813         if (!new_client && service_time)
1814                 /* Teach server about old server's estimates, as first guess
1815                  * at how long new requests will take. */
1816                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
1817                             service_time);
1818
1819         target_start_recovery_timer(obd);
1820
1821         /* Convert the service time to RPC timeout,
1822          * and reuse service_time to limit stack usage. */
1823         service_time = at_est2timeout(service_time);
1824
1825         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
1826             service_time < at_extra)
1827                 service_time = at_extra;
1828
1829         /* We expect other clients to timeout within service_time, then try
1830          * to reconnect, then try the failover server.  The max delay between
1831          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL. */
1832         service_time += 2 * INITIAL_CONNECT_TIMEOUT;
1833
1834         LASSERT(obt->obt_magic == OBT_MAGIC);
1835         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
1836         if (service_time > obd->obd_recovery_timeout && !new_client)
1837                 extend_recovery_timer(obd, service_time, false);
1838 }
1839
1840 /** Health checking routines */
1841 static inline int exp_connect_healthy(struct obd_export *exp)
1842 {
1843         return (exp->exp_in_recovery);
1844 }
1845
1846 /** if export done req_replay or has replay in queue */
1847 static inline int exp_req_replay_healthy(struct obd_export *exp)
1848 {
1849         return (!exp->exp_req_replay_needed ||
1850                 atomic_read(&exp->exp_replay_count) > 0);
1851 }
1852
1853
1854 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
1855 {
1856         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1857                exp_req_replay_healthy(exp);
1858 }
1859
1860 /** if export done lock_replay or has replay in queue */
1861 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1862 {
1863         return (!exp->exp_lock_replay_needed ||
1864                 atomic_read(&exp->exp_replay_count) > 0);
1865 }
1866
1867 static inline int exp_vbr_healthy(struct obd_export *exp)
1868 {
1869         return (!exp->exp_vbr_failed);
1870 }
1871
1872 static inline int exp_finished(struct obd_export *exp)
1873 {
1874         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1875 }
1876
1877 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
1878 {
1879         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1880                 exp_finished(exp);
1881 }
1882
1883 static int check_for_next_transno(struct lu_target *lut)
1884 {
1885         struct ptlrpc_request *req = NULL;
1886         struct obd_device *obd = lut->lut_obd;
1887         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
1888         int wake_up = 0, connected, completed, queue_len;
1889         __u64 req_transno = 0;
1890         __u64 update_transno = 0;
1891         __u64 next_transno = 0;
1892         ENTRY;
1893
1894         spin_lock(&obd->obd_recovery_task_lock);
1895         if (!list_empty(&obd->obd_req_replay_queue)) {
1896                 req = list_entry(obd->obd_req_replay_queue.next,
1897                                      struct ptlrpc_request, rq_list);
1898                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1899         }
1900
1901         if (tdtd != NULL)
1902                 update_transno = distribute_txn_get_next_transno(tdtd);
1903
1904         connected = atomic_read(&obd->obd_connected_clients);
1905         completed = connected - atomic_read(&obd->obd_req_replay_clients);
1906         queue_len = obd->obd_requests_queued_for_recovery;
1907         next_transno = obd->obd_next_recovery_transno;
1908
1909         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1910                "req_transno: %llu, next_transno: %llu\n",
1911                obd->obd_max_recoverable_clients, connected, completed,
1912                queue_len, req_transno, next_transno);
1913
1914         if (obd->obd_abort_recovery) {
1915                 CDEBUG(D_HA, "waking for aborted recovery\n");
1916                 wake_up = 1;
1917         } else if (obd->obd_recovery_expired) {
1918                 CDEBUG(D_HA, "waking for expired recovery\n");
1919                 wake_up = 1;
1920         } else if (tdtd != NULL && req != NULL &&
1921                    is_req_replayed_by_update(req)) {
1922                 LASSERTF(req_transno < next_transno, "req_transno %llu"
1923                          "next_transno%llu\n", req_transno, next_transno);
1924                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
1925                        req_transno);
1926                 wake_up = 1;
1927         } else if (req_transno == next_transno ||
1928                    (update_transno != 0 && update_transno <= next_transno)) {
1929                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
1930                 wake_up = 1;
1931         } else if (queue_len > 0 &&
1932                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1933                 /** handle gaps occured due to lost reply or VBR */
1934                 LASSERTF(req_transno >= next_transno,
1935                          "req_transno: %llu, next_transno: %llu\n",
1936                          req_transno, next_transno);
1937                 CDEBUG(D_HA,
1938                        "%s: waking for gap in transno, VBR is %s (skip: "
1939                        "%lld, ql: %d, comp: %d, conn: %d, next: %lld"
1940                        ", next_update %lld last_committed: %lld)\n",
1941                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1942                        next_transno, queue_len, completed, connected,
1943                        req_transno, update_transno, obd->obd_last_committed);
1944                 obd->obd_next_recovery_transno = req_transno;
1945                 wake_up = 1;
1946         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1947                 CDEBUG(D_HA, "waking for completed recovery\n");
1948                 wake_up = 1;
1949         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1950                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1951                        " by fail_lock, waking up (%lld)\n", next_transno);
1952                 obd->obd_next_recovery_transno = req_transno;
1953                 wake_up = 1;
1954         }
1955         spin_unlock(&obd->obd_recovery_task_lock);
1956         return wake_up;
1957 }
1958
1959 static int check_for_next_lock(struct lu_target *lut)
1960 {
1961         struct obd_device *obd = lut->lut_obd;
1962         int wake_up = 0;
1963
1964         spin_lock(&obd->obd_recovery_task_lock);
1965         if (!list_empty(&obd->obd_lock_replay_queue)) {
1966                 CDEBUG(D_HA, "waking for next lock\n");
1967                 wake_up = 1;
1968         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1969                 CDEBUG(D_HA, "waking for completed lock replay\n");
1970                 wake_up = 1;
1971         } else if (obd->obd_abort_recovery) {
1972                 CDEBUG(D_HA, "waking for aborted recovery\n");
1973                 wake_up = 1;
1974         } else if (obd->obd_recovery_expired) {
1975                 CDEBUG(D_HA, "waking for expired recovery\n");
1976                 wake_up = 1;
1977         }
1978         spin_unlock(&obd->obd_recovery_task_lock);
1979
1980         return wake_up;
1981 }
1982
1983 /**
1984  * wait for recovery events,
1985  * check its status with help of check_routine
1986  * evict dead clients via health_check
1987  */
1988 static int target_recovery_overseer(struct lu_target *lut,
1989                                     int (*check_routine)(struct lu_target *),
1990                                     int (*health_check)(struct obd_export *))
1991 {
1992         struct obd_device       *obd = lut->lut_obd;
1993         struct target_distribute_txn_data *tdtd;
1994 repeat:
1995         if (obd->obd_recovery_start != 0 && ktime_get_real_seconds() >=
1996               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
1997                 __u64 next_update_transno = 0;
1998
1999                 /* Only abort the recovery if there are no update recovery
2000                  * left in the queue */
2001                 spin_lock(&obd->obd_recovery_task_lock);
2002                 if (lut->lut_tdtd != NULL) {
2003                         next_update_transno =
2004                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2005
2006                         tdtd = lut->lut_tdtd;
2007                         /* If next_update_transno == 0, it probably because
2008                          * updatelog retrieve threads did not get any records
2009                          * yet, let's wait those threads stopped */
2010                         if (next_update_transno == 0) {
2011                                 struct l_wait_info lwi = { 0 };
2012
2013                                 l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2014                                        atomic_read(
2015                                        &tdtd->tdtd_recovery_threads_count) == 0,
2016                                        &lwi);
2017
2018                                 next_update_transno =
2019                                         distribute_txn_get_next_transno(
2020                                                                 lut->lut_tdtd);
2021                         }
2022                 }
2023
2024                 if (next_update_transno != 0 && !obd->obd_abort_recovery) {
2025                         obd->obd_next_recovery_transno = next_update_transno;
2026                         spin_unlock(&obd->obd_recovery_task_lock);
2027                         /* Disconnect unfinished exports from clients, and
2028                          * keep connection from MDT to make sure the update
2029                          * recovery will still keep trying until some one
2030                          * manually abort the recovery */
2031                         class_disconnect_stale_exports(obd,
2032                                                 exp_finished_or_from_mdt);
2033                         /* Abort all of replay and replay lock req from
2034                          * clients */
2035                         abort_req_replay_queue(obd);
2036                         abort_lock_replay_queue(obd);
2037                         CDEBUG(D_HA, "%s: there are still update replay (%#llx"
2038                                ")in the queue.\n", obd->obd_name,
2039                                next_update_transno);
2040                 } else {
2041                         obd->obd_abort_recovery = 1;
2042                         spin_unlock(&obd->obd_recovery_task_lock);
2043                         CWARN("%s recovery is aborted by hard timeout\n",
2044                               obd->obd_name);
2045                 }
2046         }
2047
2048         while (wait_event_timeout(obd->obd_next_transno_waitq,
2049                                   check_routine(lut),
2050                                   msecs_to_jiffies(60 * MSEC_PER_SEC)) == 0)
2051                 /* wait indefinitely for event, but don't trigger watchdog */;
2052
2053         if (obd->obd_abort_recovery) {
2054                 CWARN("recovery is aborted, evict exports in recovery\n");
2055                 if (lut->lut_tdtd != NULL) {
2056                         struct l_wait_info lwi = { 0 };
2057
2058                         tdtd = lut->lut_tdtd;
2059                         /* Let's wait all of the update log recovery thread
2060                          * finished */
2061                         l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2062                          atomic_read(&tdtd->tdtd_recovery_threads_count) == 0,
2063                              &lwi);
2064                         /* Then abort the update recovery list */
2065                         dtrq_list_destroy(lut->lut_tdtd);
2066                 }
2067
2068                 /** evict exports which didn't finish recovery yet */
2069                 class_disconnect_stale_exports(obd, exp_finished);
2070                 return 1;
2071         } else if (obd->obd_recovery_expired) {
2072                 obd->obd_recovery_expired = 0;
2073                 /** If some clients died being recovered, evict them */
2074                 LCONSOLE_WARN("%s: recovery is timed out, "
2075                               "evict stale exports\n", obd->obd_name);
2076                 /** evict cexports with no replay in queue, they are stalled */
2077                 class_disconnect_stale_exports(obd, health_check);
2078
2079                 /** continue with VBR */
2080                 spin_lock(&obd->obd_dev_lock);
2081                 obd->obd_version_recov = 1;
2082                 spin_unlock(&obd->obd_dev_lock);
2083                 /**
2084                  * reset timer, recovery will proceed with versions now,
2085                  * timeout is set just to handle reconnection delays
2086                  */
2087                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2088                 /** Wait for recovery events again, after evicting bad clients */
2089                 goto repeat;
2090         }
2091         return 0;
2092 }
2093
2094 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2095 {
2096         struct obd_device       *obd = lut->lut_obd;
2097         struct ptlrpc_request *req = NULL;
2098
2099         CDEBUG(D_HA, "Waiting for lock\n");
2100         if (target_recovery_overseer(lut, check_for_next_lock,
2101                                      exp_lock_replay_healthy))
2102                 abort_lock_replay_queue(obd);
2103
2104         spin_lock(&obd->obd_recovery_task_lock);
2105         if (!list_empty(&obd->obd_lock_replay_queue)) {
2106                 req = list_entry(obd->obd_lock_replay_queue.next,
2107                                      struct ptlrpc_request, rq_list);
2108                 list_del_init(&req->rq_list);
2109                 spin_unlock(&obd->obd_recovery_task_lock);
2110         } else {
2111                 spin_unlock(&obd->obd_recovery_task_lock);
2112                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2113                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2114                 /** evict exports failed VBR */
2115                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2116         }
2117         return req;
2118 }
2119
2120 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2121 {
2122         struct ptlrpc_request *req = NULL;
2123
2124         spin_lock(&obd->obd_recovery_task_lock);
2125         if (!list_empty(&obd->obd_final_req_queue)) {
2126                 req = list_entry(obd->obd_final_req_queue.next,
2127                                      struct ptlrpc_request, rq_list);
2128                 list_del_init(&req->rq_list);
2129                 spin_unlock(&obd->obd_recovery_task_lock);
2130                 if (req->rq_export->exp_in_recovery) {
2131                         spin_lock(&req->rq_export->exp_lock);
2132                         req->rq_export->exp_in_recovery = 0;
2133                         spin_unlock(&req->rq_export->exp_lock);
2134                 }
2135         } else {
2136                 spin_unlock(&obd->obd_recovery_task_lock);
2137         }
2138         return req;
2139 }
2140
2141 static void handle_recovery_req(struct ptlrpc_thread *thread,
2142                                 struct ptlrpc_request *req,
2143                                 svc_handler_t handler)
2144 {
2145         ENTRY;
2146
2147         /**
2148          * export can be evicted during recovery, no need to handle replays for
2149          * it after that, discard such request silently
2150          */
2151         if (req->rq_export->exp_disconnected)
2152                 RETURN_EXIT;
2153
2154         req->rq_session.lc_thread = thread;
2155         req->rq_svc_thread = thread;
2156         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2157
2158         /* thread context */
2159         lu_context_enter(&thread->t_env->le_ctx);
2160         (void)handler(req);
2161         lu_context_exit(&thread->t_env->le_ctx);
2162
2163         /* don't reset timer for final stage */
2164         if (!exp_finished(req->rq_export)) {
2165                 int to = obd_timeout;
2166
2167                 /**
2168                  * Add request timeout to the recovery time so next request from
2169                  * this client may come in recovery time
2170                  */
2171                 if (!AT_OFF) {
2172                         struct ptlrpc_service_part *svcpt;
2173
2174                         svcpt = req->rq_rqbd->rqbd_svcpt;
2175                         /* If the server sent early reply for this request,
2176                          * the client will recalculate the timeout according to
2177                          * current server estimate service time, so we will
2178                          * use the maxium timeout here for waiting the client
2179                          * sending the next req */
2180                         to = max((int)at_est2timeout(
2181                                  at_get(&svcpt->scp_at_estimate)),
2182                                  (int)lustre_msg_get_timeout(req->rq_reqmsg));
2183                         /* Add 2 net_latency, one for balance rq_deadline
2184                          * (see ptl_send_rpc), one for resend the req to server,
2185                          * Note: client will pack net_latency in replay req
2186                          * (see ptlrpc_replay_req) */
2187                         to += 2 * lustre_msg_get_service_time(req->rq_reqmsg);
2188                 }
2189                 extend_recovery_timer(class_exp2obd(req->rq_export), to, true);
2190         }
2191         EXIT;
2192 }
2193
2194 /** Checking routines for recovery */
2195 static int check_for_recovery_ready(struct lu_target *lut)
2196 {
2197         struct obd_device *obd = lut->lut_obd;
2198         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2199
2200         CDEBUG(D_HA, "connected %d stale %d max_recoverable_clients %d"
2201                " abort %d expired %d\n", clnts, obd->obd_stale_clients,
2202                obd->obd_max_recoverable_clients, obd->obd_abort_recovery,
2203                obd->obd_recovery_expired);
2204
2205         if (!obd->obd_abort_recovery && !obd->obd_recovery_expired) {
2206                 LASSERT(clnts <= obd->obd_max_recoverable_clients);
2207                 if (clnts + obd->obd_stale_clients <
2208                     obd->obd_max_recoverable_clients)
2209                         return 0;
2210         }
2211
2212         if (lut->lut_tdtd != NULL) {
2213                 if (!lut->lut_tdtd->tdtd_replay_ready &&
2214                     !obd->obd_abort_recovery) {
2215                         /* Let's extend recovery timer, in case the recovery
2216                          * timer expired, and some clients got evicted */
2217                         extend_recovery_timer(obd, obd->obd_recovery_timeout,
2218                                               true);
2219                         CDEBUG(D_HA, "%s update recovery is not ready, extend recovery %llu\n",
2220                                obd->obd_name, obd->obd_recovery_timeout);
2221                         return 0;
2222                 }
2223         }
2224
2225         return 1;
2226 }
2227
2228 enum {
2229         REQUEST_RECOVERY = 1,
2230         UPDATE_RECOVERY = 2,
2231 };
2232
2233 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2234 {
2235         __u64 transno = 0;
2236
2237         if (!list_empty(&obd->obd_req_replay_queue)) {
2238                 struct ptlrpc_request *req;
2239
2240                 req = list_entry(obd->obd_req_replay_queue.next,
2241                                  struct ptlrpc_request, rq_list);
2242                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2243         }
2244
2245         return transno;
2246 }
2247
2248 static __u64 get_next_transno(struct lu_target *lut, int *type)
2249 {
2250         struct obd_device *obd = lut->lut_obd;
2251         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2252         __u64 transno = 0;
2253         __u64 update_transno;
2254         ENTRY;
2255
2256         transno = get_next_replay_req_transno(obd);
2257         if (type != NULL)
2258                 *type = REQUEST_RECOVERY;
2259
2260         if (tdtd == NULL)
2261                 RETURN(transno);
2262
2263         update_transno = distribute_txn_get_next_transno(tdtd);
2264         if (transno == 0 || (transno >= update_transno &&
2265                              update_transno != 0)) {
2266                 transno = update_transno;
2267                 if (type != NULL)
2268                         *type = UPDATE_RECOVERY;
2269         }
2270
2271         RETURN(transno);
2272 }
2273
2274 /**
2275  * drop duplicate replay request
2276  *
2277  * Because the operation has been replayed by update recovery, the request
2278  * with the same transno will be dropped and also notify the client to send
2279  * next replay request.
2280  *
2281  * \param[in] env       execution environment
2282  * \param[in] obd       failover obd device
2283  * \param[in] req       request to be dropped
2284  */
2285 static void drop_duplicate_replay_req(struct lu_env *env,
2286                                       struct obd_device *obd,
2287                                       struct ptlrpc_request *req)
2288 {
2289         DEBUG_REQ(D_HA, req, "remove t%lld from %s because of duplicate"
2290                   " update records are found.\n",
2291                   lustre_msg_get_transno(req->rq_reqmsg),
2292                   libcfs_nid2str(req->rq_peer.nid));
2293
2294         /* Right now, only for MDS reint operation update replay and
2295          * normal request replay can have the same transno */
2296         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT) {
2297                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2298                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2299                 if (likely(req->rq_export))
2300                         target_committed_to_req(req);
2301                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2302                 target_send_reply(req, req->rq_status, 0);
2303         } else {
2304                 DEBUG_REQ(D_ERROR, req, "wrong opc" "from %s\n",
2305                 libcfs_nid2str(req->rq_peer.nid));
2306         }
2307         target_exp_dequeue_req_replay(req);
2308         target_request_copy_put(req);
2309         obd->obd_replayed_requests++;
2310 }
2311
2312 static void replay_request_or_update(struct lu_env *env,
2313                                      struct lu_target *lut,
2314                                      struct target_recovery_data *trd,
2315                                      struct ptlrpc_thread *thread)
2316 {
2317         struct obd_device *obd = lut->lut_obd;
2318         struct ptlrpc_request *req = NULL;
2319         int                     type;
2320         __u64                   transno;
2321         ENTRY;
2322
2323         CDEBUG(D_HA, "Waiting for transno %lld\n",
2324                obd->obd_next_recovery_transno);
2325
2326         /* Replay all of request and update by transno */
2327         do {
2328                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2329
2330                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2331
2332                 /** It is needed to extend recovery window above
2333                  *  recovery_time_soft. Extending is possible only in the
2334                  *  end of recovery window (see more details in
2335                  *  handle_recovery_req()).
2336                  */
2337                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2338
2339                 if (target_recovery_overseer(lut, check_for_next_transno,
2340                                         exp_req_replay_healthy_or_from_mdt)) {
2341                         abort_req_replay_queue(obd);
2342                         abort_lock_replay_queue(obd);
2343                         goto abort;
2344                 }
2345
2346                 spin_lock(&obd->obd_recovery_task_lock);
2347                 transno = get_next_transno(lut, &type);
2348                 if (type == REQUEST_RECOVERY && transno != 0) {
2349                         /* Drop replay request from client side, if the
2350                          * replay has been executed by update with the
2351                          * same transno */
2352                         req = list_entry(obd->obd_req_replay_queue.next,
2353                                         struct ptlrpc_request, rq_list);
2354
2355                         list_del_init(&req->rq_list);
2356                         obd->obd_requests_queued_for_recovery--;
2357                         spin_unlock(&obd->obd_recovery_task_lock);
2358
2359                         /* Let's check if the request has been redone by
2360                          * update replay */
2361                         if (is_req_replayed_by_update(req)) {
2362                                 struct distribute_txn_replay_req *dtrq;
2363
2364                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2365                                                                    req->rq_xid);
2366                                 LASSERT(dtrq != NULL);
2367                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2368                                 list_del_init(&dtrq->dtrq_list);
2369                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2370                                 dtrq_destroy(dtrq);
2371
2372                                 drop_duplicate_replay_req(env, obd, req);
2373
2374                                 continue;
2375                         }
2376
2377                         LASSERT(trd->trd_processing_task == current_pid());
2378                         DEBUG_REQ(D_HA, req, "processing t%lld from %s",
2379                                   lustre_msg_get_transno(req->rq_reqmsg),
2380                                   libcfs_nid2str(req->rq_peer.nid));
2381
2382                         handle_recovery_req(thread, req,
2383                                             trd->trd_recovery_handler);
2384                         /**
2385                          * bz18031: increase next_recovery_transno before
2386                          * target_request_copy_put() will drop exp_rpc reference
2387                          */
2388                         spin_lock(&obd->obd_recovery_task_lock);
2389                         obd->obd_next_recovery_transno++;
2390                         spin_unlock(&obd->obd_recovery_task_lock);
2391                         target_exp_dequeue_req_replay(req);
2392                         target_request_copy_put(req);
2393                         obd->obd_replayed_requests++;
2394                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2395                         struct distribute_txn_replay_req *dtrq;
2396                         int rc;
2397
2398                         spin_unlock(&obd->obd_recovery_task_lock);
2399
2400                         LASSERT(tdtd != NULL);
2401                         dtrq = distribute_txn_get_next_req(tdtd);
2402                         lu_context_enter(&thread->t_env->le_ctx);
2403                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2404                         lu_context_exit(&thread->t_env->le_ctx);
2405                         extend_recovery_timer(obd, obd_timeout, true);
2406
2407                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2408                                 CDEBUG(D_HA, "Move x%llu t%llu"
2409                                        " to finish list\n", dtrq->dtrq_xid,
2410                                        dtrq->dtrq_master_transno);
2411
2412                                 /* Add it to the replay finish list */
2413                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2414                                 list_add(&dtrq->dtrq_list,
2415                                          &tdtd->tdtd_replay_finish_list);
2416                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2417
2418                                 spin_lock(&obd->obd_recovery_task_lock);
2419                                 if (transno == obd->obd_next_recovery_transno)
2420                                         obd->obd_next_recovery_transno++;
2421                                 else if (transno >
2422                                          obd->obd_next_recovery_transno)
2423                                         obd->obd_next_recovery_transno =
2424                                                                 transno + 1;
2425                                 spin_unlock(&obd->obd_recovery_task_lock);
2426                         } else {
2427                                 dtrq_destroy(dtrq);
2428                         }
2429                 } else {
2430                         spin_unlock(&obd->obd_recovery_task_lock);
2431 abort:
2432                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2433                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2434                         /** evict exports failed VBR */
2435                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2436                         break;
2437                 }
2438         } while (1);
2439 }
2440
2441 static int target_recovery_thread(void *arg)
2442 {
2443         struct lu_target *lut = arg;
2444         struct obd_device *obd = lut->lut_obd;
2445         struct ptlrpc_request *req;
2446         struct target_recovery_data *trd = &obd->obd_recovery_data;
2447         unsigned long delta;
2448         struct lu_env *env;
2449         struct ptlrpc_thread *thread = NULL;
2450         int rc = 0;
2451         ENTRY;
2452
2453         unshare_fs_struct();
2454         OBD_ALLOC_PTR(thread);
2455         if (thread == NULL)
2456                 RETURN(-ENOMEM);
2457
2458         OBD_ALLOC_PTR(env);
2459         if (env == NULL) {
2460                 OBD_FREE_PTR(thread);
2461                 RETURN(-ENOMEM);
2462         }
2463
2464         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2465         if (rc) {
2466                 OBD_FREE_PTR(thread);
2467                 OBD_FREE_PTR(env);
2468                 RETURN(rc);
2469         }
2470
2471         thread->t_env = env;
2472         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2473         env->le_ctx.lc_thread = thread;
2474         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2475         thread->t_watchdog = NULL;
2476
2477         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2478                current_pid());
2479         trd->trd_processing_task = current_pid();
2480
2481         spin_lock(&obd->obd_dev_lock);
2482         obd->obd_recovering = 1;
2483         spin_unlock(&obd->obd_dev_lock);
2484         complete(&trd->trd_starting);
2485
2486         /* first of all, we have to know the first transno to replay */
2487         if (target_recovery_overseer(lut, check_for_recovery_ready,
2488                                      exp_connect_healthy)) {
2489                 abort_req_replay_queue(obd);
2490                 abort_lock_replay_queue(obd);
2491                 if (lut->lut_tdtd != NULL)
2492                         dtrq_list_destroy(lut->lut_tdtd);
2493         }
2494
2495         /* next stage: replay requests or update */
2496         delta = jiffies;
2497         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2498                atomic_read(&obd->obd_req_replay_clients),
2499                obd->obd_next_recovery_transno);
2500         replay_request_or_update(env, lut, trd, thread);
2501
2502         /**
2503          * The second stage: replay locks
2504          */
2505         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2506                atomic_read(&obd->obd_lock_replay_clients));
2507         while ((req = target_next_replay_lock(lut))) {
2508                 LASSERT(trd->trd_processing_task == current_pid());
2509                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
2510                           libcfs_nid2str(req->rq_peer.nid));
2511                 handle_recovery_req(thread, req,
2512                                     trd->trd_recovery_handler);
2513                 target_request_copy_put(req);
2514                 obd->obd_replayed_locks++;
2515         }
2516
2517         /**
2518          * The third stage: reply on final pings, at this moment all clients
2519          * must have request in final queue
2520          */
2521         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2522         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2523         /** Update server last boot epoch */
2524         tgt_boot_epoch_update(lut);
2525         /* We drop recoverying flag to forward all new requests
2526          * to regular mds_handle() since now */
2527         spin_lock(&obd->obd_dev_lock);
2528         obd->obd_recovering = obd->obd_abort_recovery = 0;
2529         spin_unlock(&obd->obd_dev_lock);
2530         spin_lock(&obd->obd_recovery_task_lock);
2531         target_cancel_recovery_timer(obd);
2532         spin_unlock(&obd->obd_recovery_task_lock);
2533         while ((req = target_next_final_ping(obd))) {
2534                 LASSERT(trd->trd_processing_task == current_pid());
2535                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
2536                           libcfs_nid2str(req->rq_peer.nid));
2537                 handle_recovery_req(thread, req,
2538                                     trd->trd_recovery_handler);
2539                 /* Because the waiting client can not send ping to server,
2540                  * so we need refresh the last_request_time, to avoid the
2541                  * export is being evicted */
2542                 ptlrpc_update_export_timer(req->rq_export, 0);
2543                 target_request_copy_put(req);
2544         }
2545
2546         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2547         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
2548               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2549         if (delta > OBD_RECOVERY_TIME_SOFT) {
2550                 CWARN("too long recovery - read logs\n");
2551                 libcfs_debug_dumplog();
2552         }
2553
2554         target_finish_recovery(lut);
2555
2556         lu_context_fini(&env->le_ctx);
2557         trd->trd_processing_task = 0;
2558         complete(&trd->trd_finishing);
2559
2560         tgt_io_thread_done(thread);
2561         OBD_FREE_PTR(thread);
2562         OBD_FREE_PTR(env);
2563         RETURN(rc);
2564 }
2565
2566 static int target_start_recovery_thread(struct lu_target *lut,
2567                                         svc_handler_t handler)
2568 {
2569         struct obd_device *obd = lut->lut_obd;
2570         int rc = 0;
2571         struct target_recovery_data *trd = &obd->obd_recovery_data;
2572         int index;
2573
2574         memset(trd, 0, sizeof(*trd));
2575         init_completion(&trd->trd_starting);
2576         init_completion(&trd->trd_finishing);
2577         trd->trd_recovery_handler = handler;
2578
2579         rc = server_name2index(obd->obd_name, &index, NULL);
2580         if (rc < 0)
2581                 return rc;
2582
2583         if (!IS_ERR(kthread_run(target_recovery_thread,
2584                                 lut, "tgt_recover_%d", index))) {
2585                 wait_for_completion(&trd->trd_starting);
2586                 LASSERT(obd->obd_recovering != 0);
2587         } else {
2588                 rc = -ECHILD;
2589         }
2590
2591         return rc;
2592 }
2593
2594 void target_stop_recovery_thread(struct obd_device *obd)
2595 {
2596         if (obd->obd_recovery_data.trd_processing_task > 0) {
2597                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2598                 /** recovery can be done but postrecovery is not yet */
2599                 spin_lock(&obd->obd_dev_lock);
2600                 if (obd->obd_recovering) {
2601                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2602                         obd->obd_abort_recovery = 1;
2603                         wake_up(&obd->obd_next_transno_waitq);
2604                 }
2605                 spin_unlock(&obd->obd_dev_lock);
2606                 wait_for_completion(&trd->trd_finishing);
2607         }
2608 }
2609 EXPORT_SYMBOL(target_stop_recovery_thread);
2610
2611 void target_recovery_fini(struct obd_device *obd)
2612 {
2613         class_disconnect_exports(obd);
2614         target_stop_recovery_thread(obd);
2615         target_cleanup_recovery(obd);
2616 }
2617 EXPORT_SYMBOL(target_recovery_fini);
2618
2619 static void target_recovery_expired(unsigned long castmeharder)
2620 {
2621         struct obd_device *obd = (struct obd_device *)castmeharder;
2622         CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
2623                " after %llus (%d clients connected)\n",
2624                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2625                (s64)(ktime_get_real_seconds() - obd->obd_recovery_start),
2626                atomic_read(&obd->obd_connected_clients));
2627
2628         obd->obd_recovery_expired = 1;
2629         wake_up(&obd->obd_next_transno_waitq);
2630 }
2631
2632 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2633 {
2634         struct obd_device *obd = lut->lut_obd;
2635
2636         if (lut->lut_bottom->dd_rdonly)
2637                 return;
2638
2639         if (obd->obd_max_recoverable_clients == 0) {
2640                 /** Update server last boot epoch */
2641                 tgt_boot_epoch_update(lut);
2642                 return;
2643         }
2644
2645         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2646                "last_transno %llu\n", obd->obd_name,
2647                obd->obd_max_recoverable_clients, obd->obd_last_committed);
2648         LASSERT(obd->obd_stopping == 0);
2649         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2650         obd->obd_recovery_start = 0;
2651         obd->obd_recovery_end = 0;
2652
2653         setup_timer(&obd->obd_recovery_timer, target_recovery_expired,
2654                     (unsigned long)obd);
2655         target_start_recovery_thread(lut, handler);
2656 }
2657 EXPORT_SYMBOL(target_recovery_init);
2658
2659 static int target_process_req_flags(struct obd_device *obd,
2660                                     struct ptlrpc_request *req)
2661 {
2662         struct obd_export *exp = req->rq_export;
2663         LASSERT(exp != NULL);
2664         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2665                 /* client declares he's ready to replay locks */
2666                 spin_lock(&exp->exp_lock);
2667                 if (exp->exp_req_replay_needed) {
2668                         exp->exp_req_replay_needed = 0;
2669                         spin_unlock(&exp->exp_lock);
2670
2671                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2672                         atomic_dec(&obd->obd_req_replay_clients);
2673                 } else {
2674                         spin_unlock(&exp->exp_lock);
2675                 }
2676         }
2677         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2678                 /* client declares he's ready to complete recovery
2679                  * so, we put the request on th final queue */
2680                 spin_lock(&exp->exp_lock);
2681                 if (exp->exp_lock_replay_needed) {
2682                         exp->exp_lock_replay_needed = 0;
2683                         spin_unlock(&exp->exp_lock);
2684
2685                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
2686                         atomic_dec(&obd->obd_lock_replay_clients);
2687                 } else {
2688                         spin_unlock(&exp->exp_lock);
2689                 }
2690         }
2691         return 0;
2692 }
2693
2694 int target_queue_recovery_request(struct ptlrpc_request *req,
2695                                   struct obd_device *obd)
2696 {
2697         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
2698         struct ptlrpc_request *reqiter;
2699         int inserted = 0;
2700         ENTRY;
2701
2702         if (obd->obd_recovery_data.trd_processing_task == current_pid()) {
2703                 /* Processing the queue right now, don't re-add. */
2704                 RETURN(1);
2705         }
2706
2707         target_process_req_flags(obd, req);
2708
2709         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2710                 /* client declares he's ready to complete recovery
2711                  * so, we put the request on th final queue */
2712                 target_request_copy_get(req);
2713                 DEBUG_REQ(D_HA, req, "queue final req");
2714                 wake_up(&obd->obd_next_transno_waitq);
2715                 spin_lock(&obd->obd_recovery_task_lock);
2716                 if (obd->obd_recovering) {
2717                         struct ptlrpc_request *tmp;
2718                         struct ptlrpc_request *duplicate = NULL;
2719
2720                         if (likely(!req->rq_export->exp_replay_done)) {
2721                                 req->rq_export->exp_replay_done = 1;
2722                                 list_add_tail(&req->rq_list,
2723                                               &obd->obd_final_req_queue);
2724                                 spin_unlock(&obd->obd_recovery_task_lock);
2725                                 RETURN(0);
2726                         }
2727
2728                         /* XXX O(n), but only happens if final ping is
2729                          * timed out, probably reorganize the list as
2730                          * a hash list later */
2731                         list_for_each_entry_safe(reqiter, tmp,
2732                                                  &obd->obd_final_req_queue,
2733                                                  rq_list) {
2734                                 if (reqiter->rq_export == req->rq_export) {
2735                                         list_del_init(&reqiter->rq_list);
2736                                         duplicate = reqiter;
2737                                         break;
2738                                 }
2739                         }
2740
2741                         list_add_tail(&req->rq_list,
2742                                       &obd->obd_final_req_queue);
2743                         req->rq_export->exp_replay_done = 1;
2744                         spin_unlock(&obd->obd_recovery_task_lock);
2745
2746                         if (duplicate != NULL) {
2747                                 DEBUG_REQ(D_HA, duplicate,
2748                                           "put prev final req\n");
2749                                 target_request_copy_put(duplicate);
2750                         }
2751                         RETURN(0);
2752                 } else {
2753                         spin_unlock(&obd->obd_recovery_task_lock);
2754                         target_request_copy_put(req);
2755                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
2756                 }
2757         }
2758         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2759                 /* client declares he's ready to replay locks */
2760                 target_request_copy_get(req);
2761                 DEBUG_REQ(D_HA, req, "queue lock replay req");
2762                 wake_up(&obd->obd_next_transno_waitq);
2763                 spin_lock(&obd->obd_recovery_task_lock);
2764                 LASSERT(obd->obd_recovering);
2765                 /* usually due to recovery abort */
2766                 if (!req->rq_export->exp_in_recovery) {
2767                         spin_unlock(&obd->obd_recovery_task_lock);
2768                         target_request_copy_put(req);
2769                         RETURN(-ENOTCONN);
2770                 }
2771                 LASSERT(req->rq_export->exp_lock_replay_needed);
2772                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
2773                 spin_unlock(&obd->obd_recovery_task_lock);
2774                 RETURN(0);
2775         }
2776
2777         /* CAVEAT EMPTOR: The incoming request message has been swabbed
2778          * (i.e. buflens etc are in my own byte order), but type-dependent
2779          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed. */
2780
2781         if (!transno) {
2782                 INIT_LIST_HEAD(&req->rq_list);
2783                 DEBUG_REQ(D_HA, req, "not queueing");
2784                 RETURN(1);
2785         }
2786
2787         /* If we're processing the queue, we want don't want to queue this
2788          * message.
2789          *
2790          * Also, if this request has a transno less than the one we're waiting
2791          * for, we should process it now.  It could (and currently always will)
2792          * be an open request for a descriptor that was opened some time ago.
2793          *
2794          * Also, a resent, replayed request that has already been
2795          * handled will pass through here and be processed immediately.
2796          */
2797         CDEBUG(D_HA, "Next recovery transno: %llu"
2798                ", current: %llu, replaying\n",
2799                obd->obd_next_recovery_transno, transno);
2800
2801         /* If the request has been replayed by update replay, then sends this
2802          * request to the recovery thread (replay_request_or_update()), where
2803          * it will be handled */
2804         spin_lock(&obd->obd_recovery_task_lock);
2805         if (transno < obd->obd_next_recovery_transno &&
2806             !is_req_replayed_by_update(req)) {
2807                 /* Processing the queue right now, don't re-add. */
2808                 LASSERT(list_empty(&req->rq_list));
2809                 spin_unlock(&obd->obd_recovery_task_lock);
2810                 RETURN(1);
2811         }
2812         spin_unlock(&obd->obd_recovery_task_lock);
2813
2814         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2815                 RETURN(0);
2816
2817         target_request_copy_get(req);
2818         if (!req->rq_export->exp_in_recovery) {
2819                 target_request_copy_put(req);
2820                 RETURN(-ENOTCONN);
2821         }
2822         LASSERT(req->rq_export->exp_req_replay_needed);
2823
2824         if (target_exp_enqueue_req_replay(req)) {
2825                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2826                 target_request_copy_put(req);
2827                 RETURN(0);
2828         }
2829
2830         /* XXX O(n^2) */
2831         spin_lock(&obd->obd_recovery_task_lock);
2832         LASSERT(obd->obd_recovering);
2833         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
2834                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2835                         list_add_tail(&req->rq_list, &reqiter->rq_list);
2836                         inserted = 1;
2837                         goto added;
2838                 }
2839
2840                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2841                              transno)) {
2842                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2843                                   "has been claimed by another client");
2844                         spin_unlock(&obd->obd_recovery_task_lock);
2845                         target_exp_dequeue_req_replay(req);
2846                         target_request_copy_put(req);
2847                         RETURN(0);
2848                 }
2849         }
2850 added:
2851         if (!inserted)
2852                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2853
2854         obd->obd_requests_queued_for_recovery++;
2855         spin_unlock(&obd->obd_recovery_task_lock);
2856         wake_up(&obd->obd_next_transno_waitq);
2857         RETURN(0);
2858 }
2859
2860 int target_handle_ping(struct ptlrpc_request *req)
2861 {
2862         obd_ping(req->rq_svc_thread->t_env, req->rq_export);
2863         return req_capsule_server_pack(&req->rq_pill);
2864 }
2865
2866 void target_committed_to_req(struct ptlrpc_request *req)
2867 {
2868         struct obd_export *exp = req->rq_export;
2869
2870         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2871                 lustre_msg_set_last_committed(req->rq_repmsg,
2872                                               exp->exp_last_committed);
2873         else
2874                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2875                           "%d)", exp->exp_obd->obd_no_transno,
2876                           req->rq_repmsg == NULL);
2877
2878         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
2879                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2880 }
2881
2882 #endif /* HAVE_SERVER_SUPPORT */
2883
2884 /**
2885  * Packs current SLV and Limit into \a req.
2886  */
2887 int target_pack_pool_reply(struct ptlrpc_request *req)
2888 {
2889         struct obd_device *obd;
2890         ENTRY;
2891
2892         /* Check that we still have all structures alive as this may
2893          * be some late RPC at shutdown time. */
2894         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2895                      !exp_connect_lru_resize(req->rq_export))) {
2896                 lustre_msg_set_slv(req->rq_repmsg, 0);
2897                 lustre_msg_set_limit(req->rq_repmsg, 0);
2898                 RETURN(0);
2899         }
2900
2901         /* OBD is alive here as export is alive, which we checked above. */
2902         obd = req->rq_export->exp_obd;
2903
2904         read_lock(&obd->obd_pool_lock);
2905         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2906         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2907         read_unlock(&obd->obd_pool_lock);
2908
2909         RETURN(0);
2910 }
2911
2912 static int target_send_reply_msg(struct ptlrpc_request *req,
2913                                  int rc, int fail_id)
2914 {
2915         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2916                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2917                 return -ECOMM;
2918         }
2919         /* We can have a null rq_reqmsg in the event of bad signature or
2920          * no context when unwrapping */
2921         if (req->rq_reqmsg &&
2922             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
2923             OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
2924                 return -ECOMM;
2925
2926         if (unlikely(rc)) {
2927                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
2928                 req->rq_status = rc;
2929                 return ptlrpc_send_error(req, 1);
2930         } else {
2931                 DEBUG_REQ(D_NET, req, "sending reply");
2932         }
2933
2934         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
2935 }
2936
2937 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2938 {
2939         struct ptlrpc_service_part *svcpt;
2940         int                        netrc;
2941         struct ptlrpc_reply_state *rs;
2942         struct obd_export         *exp;
2943         ENTRY;
2944
2945         if (req->rq_no_reply) {
2946                 EXIT;
2947                 return;
2948         }
2949
2950         svcpt = req->rq_rqbd->rqbd_svcpt;
2951         rs = req->rq_reply_state;
2952         if (rs == NULL || !rs->rs_difficult) {
2953                 /* no notifiers */
2954                 target_send_reply_msg (req, rc, fail_id);
2955                 EXIT;
2956                 return;
2957         }
2958
2959         /* must be an export if locks saved */
2960         LASSERT(req->rq_export != NULL);
2961         /* req/reply consistent */
2962         LASSERT(rs->rs_svcpt == svcpt);
2963
2964         /* "fresh" reply */
2965         LASSERT(!rs->rs_scheduled);
2966         LASSERT(!rs->rs_scheduled_ever);
2967         LASSERT(!rs->rs_handled);
2968         LASSERT(!rs->rs_on_net);
2969         LASSERT(rs->rs_export == NULL);
2970         LASSERT(list_empty(&rs->rs_obd_list));
2971         LASSERT(list_empty(&rs->rs_exp_list));
2972
2973         exp = class_export_get(req->rq_export);
2974
2975         /* disable reply scheduling while I'm setting up */
2976         rs->rs_scheduled = 1;
2977         rs->rs_on_net    = 1;
2978         rs->rs_xid       = req->rq_xid;
2979         rs->rs_transno   = req->rq_transno;
2980         rs->rs_export    = exp;
2981         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
2982
2983         spin_lock(&exp->exp_uncommitted_replies_lock);
2984         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
2985                rs->rs_transno, exp->exp_last_committed);
2986         if (rs->rs_transno > exp->exp_last_committed) {
2987                 /* not committed already */
2988                 list_add_tail(&rs->rs_obd_list,
2989                                   &exp->exp_uncommitted_replies);
2990         }
2991         spin_unlock(&exp->exp_uncommitted_replies_lock);
2992
2993         spin_lock(&exp->exp_lock);
2994         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
2995         spin_unlock(&exp->exp_lock);
2996
2997         netrc = target_send_reply_msg(req, rc, fail_id);
2998
2999         spin_lock(&svcpt->scp_rep_lock);
3000
3001         atomic_inc(&svcpt->scp_nreps_difficult);
3002
3003         if (netrc != 0) {
3004                 /* error sending: reply is off the net.  Also we need +1
3005                  * reply ref until ptlrpc_handle_rs() is done
3006                  * with the reply state (if the send was successful, there
3007                  * would have been +1 ref for the net, which
3008                  * reply_out_callback leaves alone) */
3009                 rs->rs_on_net = 0;
3010                 ptlrpc_rs_addref(rs);
3011         }
3012
3013         spin_lock(&rs->rs_lock);
3014         if (rs->rs_transno <= exp->exp_last_committed ||
3015             (!rs->rs_on_net && !rs->rs_no_ack) ||
3016             list_empty(&rs->rs_exp_list) ||     /* completed already */
3017             list_empty(&rs->rs_obd_list)) {
3018                 CDEBUG(D_HA, "Schedule reply immediately\n");
3019                 ptlrpc_dispatch_difficult_reply(rs);
3020         } else {
3021                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
3022                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
3023         }
3024         spin_unlock(&rs->rs_lock);
3025         spin_unlock(&svcpt->scp_rep_lock);
3026         EXIT;
3027 }
3028
3029 enum ldlm_mode lck_compat_array[] = {
3030         [LCK_EX]    = LCK_COMPAT_EX,
3031         [LCK_PW]    = LCK_COMPAT_PW,
3032         [LCK_PR]    = LCK_COMPAT_PR,
3033         [LCK_CW]    = LCK_COMPAT_CW,
3034         [LCK_CR]    = LCK_COMPAT_CR,
3035         [LCK_NL]    = LCK_COMPAT_NL,
3036         [LCK_GROUP] = LCK_COMPAT_GROUP,
3037         [LCK_COS]   = LCK_COMPAT_COS,
3038 };
3039
3040 /**
3041  * Rather arbitrary mapping from LDLM error codes to errno values. This should
3042  * not escape to the user level.
3043  */
3044 int ldlm_error2errno(enum ldlm_error error)
3045 {
3046         int result;
3047
3048         switch (error) {
3049         case ELDLM_OK:
3050         case ELDLM_LOCK_MATCHED:
3051                 result = 0;
3052                 break;
3053         case ELDLM_LOCK_CHANGED:
3054                 result = -ESTALE;
3055                 break;
3056         case ELDLM_LOCK_ABORTED:
3057                 result = -ENAVAIL;
3058                 break;
3059         case ELDLM_LOCK_REPLACED:
3060                 result = -ESRCH;
3061                 break;
3062         case ELDLM_NO_LOCK_DATA:
3063                 result = -ENOENT;
3064                 break;
3065         case ELDLM_NAMESPACE_EXISTS:
3066                 result = -EEXIST;
3067                 break;
3068         case ELDLM_BAD_NAMESPACE:
3069                 result = -EBADF;
3070                 break;
3071         default:
3072                 if (((int)error) < 0) { /* cast to signed type */
3073                         result = error; /* as ldlm_error can be unsigned */
3074                 } else {
3075                         CERROR("Invalid DLM result code: %d\n", error);
3076                         result = -EPROTO;
3077                 }
3078         }
3079         return result;
3080 }
3081 EXPORT_SYMBOL(ldlm_error2errno);
3082
3083 /**
3084  * Dual to ldlm_error2errno(): maps errno values back to enum ldlm_error.
3085  */
3086 enum ldlm_error ldlm_errno2error(int err_no)
3087 {
3088         int error;
3089
3090         switch (err_no) {
3091         case 0:
3092                 error = ELDLM_OK;
3093                 break;
3094         case -ESTALE:
3095                 error = ELDLM_LOCK_CHANGED;
3096                 break;
3097         case -ENAVAIL:
3098                 error = ELDLM_LOCK_ABORTED;
3099                 break;
3100         case -ESRCH:
3101                 error = ELDLM_LOCK_REPLACED;
3102                 break;
3103         case -ENOENT:
3104                 error = ELDLM_NO_LOCK_DATA;
3105                 break;
3106         case -EEXIST:
3107                 error = ELDLM_NAMESPACE_EXISTS;
3108                 break;
3109         case -EBADF:
3110                 error = ELDLM_BAD_NAMESPACE;
3111                 break;
3112         default:
3113                 error = err_no;
3114         }
3115         return error;
3116 }
3117
3118 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3119 void ldlm_dump_export_locks(struct obd_export *exp)
3120 {
3121         spin_lock(&exp->exp_locks_list_guard);
3122         if (!list_empty(&exp->exp_locks_list)) {
3123                 struct ldlm_lock *lock;
3124
3125                 CERROR("dumping locks for export %p,"
3126                        "ignore if the unmount doesn't hang\n", exp);
3127                 list_for_each_entry(lock, &exp->exp_locks_list,
3128                                         l_exp_refs_link)
3129                         LDLM_ERROR(lock, "lock:");
3130         }
3131         spin_unlock(&exp->exp_locks_list_guard);
3132 }
3133 #endif
3134
3135 #ifdef HAVE_SERVER_SUPPORT
3136 static int target_bulk_timeout(void *data)
3137 {
3138         ENTRY;
3139         /* We don't fail the connection here, because having the export
3140          * killed makes the (vital) call to commitrw very sad.
3141          */
3142         RETURN(1);
3143 }
3144
3145 static inline const char *bulk2type(struct ptlrpc_request *req)
3146 {
3147         if (req->rq_bulk_read)
3148                 return "READ";
3149         if (req->rq_bulk_write)
3150                 return "WRITE";
3151         return "UNKNOWN";
3152 }
3153
3154 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc,
3155                    struct l_wait_info *lwi)
3156 {
3157         struct ptlrpc_request   *req = desc->bd_req;
3158         time_t                   start = cfs_time_current_sec();
3159         time_t                   deadline;
3160         int                      rc = 0;
3161
3162         ENTRY;
3163
3164         /* If there is eviction in progress, wait for it to finish. */
3165         if (unlikely(atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
3166                 *lwi = LWI_INTR(NULL, NULL);
3167                 rc = l_wait_event(exp->exp_obd->obd_evict_inprogress_waitq,
3168                                   !atomic_read(&exp->exp_obd->
3169                                                    obd_evict_inprogress),
3170                                   lwi);
3171         }
3172
3173         /* Check if client was evicted or reconnected already. */
3174         if (exp->exp_failed ||
3175             exp->exp_conn_cnt > lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3176                 rc = -ENOTCONN;
3177         } else {
3178                 if (req->rq_bulk_read)
3179                         rc = sptlrpc_svc_wrap_bulk(req, desc);
3180
3181                 if (OCD_HAS_FLAG(&exp->exp_connect_data, BULK_MBITS))
3182                         req->rq_mbits = lustre_msg_get_mbits(req->rq_reqmsg);
3183                 else /* old version, bulk matchbits is rq_xid */
3184                         req->rq_mbits = req->rq_xid;
3185
3186                 if (rc == 0)
3187                         rc = ptlrpc_start_bulk_transfer(desc);
3188         }
3189
3190         if (rc < 0) {
3191                 DEBUG_REQ(D_ERROR, req, "bulk %s failed: rc %d",
3192                           bulk2type(req), rc);
3193                 RETURN(rc);
3194         }
3195
3196         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
3197                 ptlrpc_abort_bulk(desc);
3198                 RETURN(0);
3199         }
3200
3201         /* limit actual bulk transfer to bulk_timeout seconds */
3202         deadline = start + bulk_timeout;
3203         if (deadline > req->rq_deadline)
3204                 deadline = req->rq_deadline;
3205
3206         do {
3207                 long timeoutl = deadline - cfs_time_current_sec();
3208                 cfs_duration_t timeout = timeoutl <= 0 ?
3209                                          CFS_TICK : cfs_time_seconds(timeoutl);
3210                 time_t  rq_deadline;
3211
3212                 *lwi = LWI_TIMEOUT_INTERVAL(timeout, cfs_time_seconds(1),
3213                                             target_bulk_timeout, desc);
3214                 rc = l_wait_event(desc->bd_waitq,
3215                                   !ptlrpc_server_bulk_active(desc) ||
3216                                   exp->exp_failed ||
3217                                   exp->exp_conn_cnt >
3218                                   lustre_msg_get_conn_cnt(req->rq_reqmsg),
3219                                   lwi);
3220                 LASSERT(rc == 0 || rc == -ETIMEDOUT);
3221                 /* Wait again if we changed rq_deadline. */
3222                 rq_deadline = ACCESS_ONCE(req->rq_deadline);
3223                 deadline = start + bulk_timeout;
3224                 if (deadline > rq_deadline)
3225                         deadline = rq_deadline;
3226         } while ((rc == -ETIMEDOUT) &&
3227                  (deadline > cfs_time_current_sec()));
3228
3229         if (rc == -ETIMEDOUT) {
3230                 DEBUG_REQ(D_ERROR, req, "timeout on bulk %s after %ld%+lds",
3231                           bulk2type(req), deadline - start,
3232                           cfs_time_current_sec() - deadline);
3233                 ptlrpc_abort_bulk(desc);
3234         } else if (exp->exp_failed) {
3235                 DEBUG_REQ(D_ERROR, req, "Eviction on bulk %s",
3236                           bulk2type(req));
3237                 rc = -ENOTCONN;
3238                 ptlrpc_abort_bulk(desc);
3239         } else if (exp->exp_conn_cnt >
3240                    lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3241                 DEBUG_REQ(D_ERROR, req, "Reconnect on bulk %s",
3242                           bulk2type(req));
3243                 /* We don't reply anyway. */
3244                 rc = -ETIMEDOUT;
3245                 ptlrpc_abort_bulk(desc);
3246         } else if (desc->bd_failure) {
3247                 DEBUG_REQ(D_ERROR, req, "network error on bulk %s",
3248                           bulk2type(req));
3249                 /* XXX should this be a different errno? */
3250                 rc = -ETIMEDOUT;
3251         } else {
3252                 if (req->rq_bulk_write)
3253                         rc = sptlrpc_svc_unwrap_bulk(req, desc);
3254                 if (rc == 0 && desc->bd_nob_transferred != desc->bd_nob) {
3255                         DEBUG_REQ(D_ERROR, req, "truncated bulk %s %d(%d)",
3256                                   bulk2type(req), desc->bd_nob_transferred,
3257                                   desc->bd_nob);
3258                         /* XXX should this be a different errno? */
3259                         rc = -ETIMEDOUT;
3260                 }
3261         }
3262
3263         RETURN(rc);
3264 }
3265 EXPORT_SYMBOL(target_bulk_io);
3266
3267 #endif /* HAVE_SERVER_SUPPORT */