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         INIT_LIST_HEAD(&cli->cl_chg_dev_linkage);
 440
 441         if (connect_op == MDS_CONNECT) {
 442                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
 443                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
 444                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 445                 if (cli->cl_mod_tag_bitmap == NULL)
 446                         GOTO(err, rc = -ENOMEM);
 447         }
 448
 449         rc = ldlm_get_ref();
 450         if (rc) {
 451                 CERROR("ldlm_get_ref failed: %d\n", rc);
 452                 GOTO(err, rc);
 453         }
 454
 455         ptlrpc_init_client(rq_portal, rp_portal, name,
 456                            &obddev->obd_ldlm_client);
 457
 458         imp = class_new_import(obddev);
 459         if (imp == NULL)
 460                 GOTO(err_ldlm, rc = -ENOENT);
 461         imp->imp_client = &obddev->obd_ldlm_client;
 462         imp->imp_connect_op = connect_op;
 463         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 464                LUSTRE_CFG_BUFLEN(lcfg, 1));
 465         class_import_put(imp);
 466
 467         if (lustre_cfg_buf(lcfg, 4)) {
 468                 __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
 469
 470                 if (refnet == LNET_NIDNET(LNET_NID_ANY)) {
 471                         rc = -EINVAL;
 472                         CERROR("%s: bad mount option 'network=%s': rc = %d\n",
 473                                obddev->obd_name, lustre_cfg_string(lcfg, 4),
 474                                rc);
 475                         GOTO(err_import, rc);
 476                 }
 477                 fake_conn.c_self = LNET_MKNID(refnet, 0);
 478                 imp->imp_connection = &fake_conn;
 479         }
 480
 481         rc = client_import_add_conn(imp, &server_uuid, 1);
 482         if (rc) {
 483                 CERROR("can't add initial connection\n");
 484                 GOTO(err_import, rc);
 485         }
 486         imp->imp_connection = NULL;
 487
 488         cli->cl_import = imp;
 489         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
 490         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 491
 492         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 493                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 494                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 495                                name, obddev->obd_name,
 496                                cli->cl_target_uuid.uuid);
 497                         spin_lock(&imp->imp_lock);
 498                         imp->imp_deactive = 1;
 499                         spin_unlock(&imp->imp_lock);
 500                 }
 501         }
 502
 503         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 504                                                    LDLM_NAMESPACE_CLIENT,
 505                                                    LDLM_NAMESPACE_GREEDY,
 506                                                    ns_type);
 507         if (obddev->obd_namespace == NULL) {
 508                 CERROR("Unable to create client namespace - %s\n",
 509                        obddev->obd_name);
 510                 GOTO(err_import, rc = -ENOMEM);
 511         }
 512
 513         RETURN(rc);
 514
 515 err_import:
 516         class_destroy_import(imp);
 517 err_ldlm:
 518         ldlm_put_ref();
 519 err:
 520         if (cli->cl_mod_tag_bitmap != NULL)
 521                 OBD_FREE(cli->cl_mod_tag_bitmap,
 522                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 523         cli->cl_mod_tag_bitmap = NULL;
 524         RETURN(rc);
 525
 526 }
 527 EXPORT_SYMBOL(client_obd_setup);
 528
 529 int client_obd_cleanup(struct obd_device *obddev)
 530 {
 531         struct client_obd *cli = &obddev->u.cli;
 532         ENTRY;
 533
 534         ldlm_namespace_free_post(obddev->obd_namespace);
 535         obddev->obd_namespace = NULL;
 536
 537         obd_cleanup_client_import(obddev);
 538         LASSERT(obddev->u.cli.cl_import == NULL);
 539
 540         ldlm_put_ref();
 541
 542         if (cli->cl_mod_tag_bitmap != NULL)
 543                 OBD_FREE(cli->cl_mod_tag_bitmap,
 544                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 545         cli->cl_mod_tag_bitmap = NULL;
 546
 547         RETURN(0);
 548 }
 549 EXPORT_SYMBOL(client_obd_cleanup);
 550
 551 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 552 int client_connect_import(const struct lu_env *env,
 553                           struct obd_export **exp,
 554                           struct obd_device *obd, struct obd_uuid *cluuid,
 555                           struct obd_connect_data *data, void *localdata)
 556 {
 557         struct client_obd       *cli    = &obd->u.cli;
 558         struct obd_import       *imp    = cli->cl_import;
 559         struct obd_connect_data *ocd;
 560         struct lustre_handle    conn    = { 0 };
 561         int                     rc;
 562         ENTRY;
 563
 564         *exp = NULL;
 565         down_write(&cli->cl_sem);
 566         if (cli->cl_conn_count > 0)
 567                 GOTO(out_sem, rc = -EALREADY);
 568
 569         rc = class_connect(&conn, obd, cluuid);
 570         if (rc)
 571                 GOTO(out_sem, rc);
 572
 573         cli->cl_conn_count++;
 574         *exp = class_conn2export(&conn);
 575
 576         LASSERT(obd->obd_namespace);
 577
 578         imp->imp_dlm_handle = conn;
 579         rc = ptlrpc_init_import(imp);
 580         if (rc != 0)
 581                 GOTO(out_ldlm, rc);
 582
 583         ocd = &imp->imp_connect_data;
 584         if (data) {
 585                 *ocd = *data;
 586                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 587                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
 588         }
 589
 590         rc = ptlrpc_connect_import(imp);
 591         if (rc != 0) {
 592                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 593                 GOTO(out_ldlm, rc);
 594         }
 595         LASSERT(*exp != NULL && (*exp)->exp_connection);
 596
 597         if (data) {
 598                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 599                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 600                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 601                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 602         }
 603
 604         ptlrpc_pinger_add_import(imp);
 605
 606         EXIT;
 607
 608         if (rc) {
 609 out_ldlm:
 610                 cli->cl_conn_count--;
 611                 class_disconnect(*exp);
 612                 *exp = NULL;
 613         }
 614 out_sem:
 615         up_write(&cli->cl_sem);
 616
 617         return rc;
 618 }
 619 EXPORT_SYMBOL(client_connect_import);
 620
 621 int client_disconnect_export(struct obd_export *exp)
 622 {
 623         struct obd_device *obd = class_exp2obd(exp);
 624         struct client_obd *cli;
 625         struct obd_import *imp;
 626         int rc = 0, err;
 627         ENTRY;
 628
 629         if (!obd) {
 630                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 631                        exp, exp ? exp->exp_handle.h_cookie : -1);
 632                 RETURN(-EINVAL);
 633         }
 634
 635         cli = &obd->u.cli;
 636         imp = cli->cl_import;
 637
 638         down_write(&cli->cl_sem);
 639         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
 640                 cli->cl_conn_count);
 641
 642         if (cli->cl_conn_count == 0) {
 643                 CERROR("disconnecting disconnected device (%s)\n",
 644                        obd->obd_name);
 645                 GOTO(out_disconnect, rc = -EINVAL);
 646         }
 647
 648         cli->cl_conn_count--;
 649         if (cli->cl_conn_count != 0)
 650                 GOTO(out_disconnect, rc = 0);
 651
 652         /* Mark import deactivated now, so we don't try to reconnect if any
 653          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 654          * fully deactivate the import, or that would drop all requests. */
 655         spin_lock(&imp->imp_lock);
 656         imp->imp_deactive = 1;
 657         spin_unlock(&imp->imp_lock);
 658
 659         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 660          * delete it regardless.  (It's safe to delete an import that was
 661          * never added.) */
 662         (void)ptlrpc_pinger_del_import(imp);
 663
 664         if (obd->obd_namespace != NULL) {
 665                 /* obd_force == local only */
 666                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 667                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 668                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 669         }
 670
 671         /* There's no need to hold sem while disconnecting an import,
 672          * and it may actually cause deadlock in GSS. */
 673         up_write(&cli->cl_sem);
 674         rc = ptlrpc_disconnect_import(imp, 0);
 675         down_write(&cli->cl_sem);
 676
 677         ptlrpc_invalidate_import(imp);
 678
 679         EXIT;
 680
 681 out_disconnect:
 682         /* Use server style - class_disconnect should be always called for
 683          * o_disconnect. */
 684         err = class_disconnect(exp);
 685         if (!rc && err)
 686                 rc = err;
 687
 688         up_write(&cli->cl_sem);
 689
 690         RETURN(rc);
 691 }
 692 EXPORT_SYMBOL(client_disconnect_export);
 693
 694 #ifdef HAVE_SERVER_SUPPORT
 695 int server_disconnect_export(struct obd_export *exp)
 696 {
 697         int rc;
 698         ENTRY;
 699
 700         /* Disconnect early so that clients can't keep using export. */
 701         rc = class_disconnect(exp);
 702         /* Close import to avoid sending any requests. */
 703         if (exp->exp_imp_reverse)
 704                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 705
 706         ldlm_bl_thread_wakeup();
 707
 708         /* complete all outstanding replies */
 709         spin_lock(&exp->exp_lock);
 710         while (!list_empty(&exp->exp_outstanding_replies)) {
 711                 struct ptlrpc_reply_state *rs =
 712                         list_entry(exp->exp_outstanding_replies.next,
 713                                        struct ptlrpc_reply_state, rs_exp_list);
 714                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 715
 716                 spin_lock(&svcpt->scp_rep_lock);
 717
 718                 list_del_init(&rs->rs_exp_list);
 719
 720                 spin_lock(&rs->rs_lock);
 721                 /* clear rs_convert_lock to make sure rs is handled and put */
 722                 rs->rs_convert_lock = 0;
 723                 ptlrpc_schedule_difficult_reply(rs);
 724                 spin_unlock(&rs->rs_lock);
 725
 726                 spin_unlock(&svcpt->scp_rep_lock);
 727         }
 728         spin_unlock(&exp->exp_lock);
 729
 730         RETURN(rc);
 731 }
 732 EXPORT_SYMBOL(server_disconnect_export);
 733
 734 /* --------------------------------------------------------------------------
 735  * from old lib/target.c
 736  * -------------------------------------------------------------------------- */
 737
 738 static int target_handle_reconnect(struct lustre_handle *conn,
 739                                    struct obd_export *exp,
 740                                    struct obd_uuid *cluuid)
 741 {
 742         struct obd_device *target;
 743         struct lustre_handle *hdl;
 744         cfs_time_t now;
 745         cfs_time_t deadline;
 746         int timeout;
 747         int rc = 0;
 748         ENTRY;
 749
 750         hdl = &exp->exp_imp_reverse->imp_remote_handle;
 751         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
 752                 conn->cookie = exp->exp_handle.h_cookie;
 753                 CDEBUG(D_HA, "connect export for UUID '%s' at %p,"
 754                        " cookie %#llx\n", cluuid->uuid, exp, conn->cookie);
 755                 RETURN(0);
 756         }
 757
 758         target = exp->exp_obd;
 759
 760         /* Might be a re-connect after a partition. */
 761         if (memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 762                 LCONSOLE_WARN("%s: already connected client %s (at %s) "
 763                               "with handle %#llx. Rejecting client "
 764                               "with the same UUID trying to reconnect "
 765                               "with handle %#llx\n", target->obd_name,
 766                               obd_uuid2str(&exp->exp_client_uuid),
 767                               obd_export_nid2str(exp),
 768                               hdl->cookie, conn->cookie);
 769                 memset(conn, 0, sizeof *conn);
 770                 /* target_handle_connect() treats EALREADY and
 771                  * -EALREADY differently.  -EALREADY is an error
 772                  * (same UUID, different handle). */
 773                 RETURN(-EALREADY);
 774         }
 775
 776         if (!target->obd_recovering) {
 777                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
 778                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
 779                         obd_export_nid2str(exp));
 780                 GOTO(out_already, rc);
 781         }
 782
 783         now = cfs_time_current();
 784         deadline = target->obd_recovery_timer.expires;
 785         if (cfs_time_before(now, deadline)) {
 786                 struct target_distribute_txn_data *tdtd =
 787                                         class_exp2tgt(exp)->lut_tdtd;
 788                 int size = 0;
 789                 int count = 0;
 790                 char *buf = NULL;
 791
 792                 timeout = cfs_duration_sec(cfs_time_sub(deadline, now));
 793                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
 794                         buf = tdtd->tdtd_show_update_logs_retrievers(
 795                                 tdtd->tdtd_show_retrievers_cbdata,
 796                                 &size, &count);
 797
 798                 if (count > 0)
 799                         LCONSOLE_WARN("%s: Recovery already passed deadline "
 800                                       "%d:%.02d. It is due to DNE recovery "
 801                                       "failed/stuck on the %d MDT(s):%s. "
 802                                       "Please wait until all MDTs recovered "
 803                                       "or abort the recovery by force.\n",
 804                                       target->obd_name, timeout / 60,
 805                                       timeout % 60, count,
 806                                       buf ? buf : "unknown (not enough RAM)");
 807                 else
 808                         LCONSOLE_WARN("%s: Recovery already passed deadline "
 809                                       "%d:%.02d. If you do not want to wait "
 810                                       "more, please abort the recovery by "
 811                                       "force.\n", target->obd_name,
 812                                       timeout / 60, timeout % 60);
 813
 814                 if (buf != NULL)
 815                         OBD_FREE(buf, size);
 816         } else {
 817                 timeout = cfs_duration_sec(cfs_time_sub(now, deadline));
 818                 LCONSOLE_WARN("%s: Recovery already passed deadline"
 819                         " %d:%.02d, It is most likely due to DNE"
 820                         " recovery is failed or stuck, please wait a"
 821                         " few more minutes or abort the recovery.\n",
 822                         target->obd_name, timeout / 60, timeout % 60);
 823         }
 824
 825 out_already:
 826         conn->cookie = exp->exp_handle.h_cookie;
 827         /* target_handle_connect() treats EALREADY and
 828          * -EALREADY differently.  EALREADY means we are
 829          * doing a valid reconnect from the same client. */
 830         RETURN(EALREADY);
 831 }
 832
 833 static void
 834 check_and_start_recovery_timer(struct obd_device *obd,
 835                                struct ptlrpc_request *req, int new_client);
 836
 837 /**
 838  * update flags for import during reconnect process
 839  */
 840 static int rev_import_flags_update(struct obd_import *revimp,
 841                                    struct ptlrpc_request *req)
 842 {
 843         int rc;
 844         struct obd_connect_data *data;
 845
 846         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 847
 848         if (data->ocd_connect_flags & OBD_CONNECT_AT)
 849                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 850         else
 851                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 852
 853         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
 854
 855         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
 856         if (rc) {
 857                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
 858                         revimp->imp_client->cli_name,
 859                         libcfs_id2str(req->rq_peer), rc);
 860                 return rc;
 861         }
 862
 863         return 0;
 864 }
 865
 866 /**
 867  * Allocate a new reverse import for an export.
 868  *
 869  * \retval -errno in case error hit
 870  * \retval 0 if reverse import correctly init
 871  **/
 872 int rev_import_init(struct obd_export *export)
 873 {
 874         struct obd_device *obd = export->exp_obd;
 875         struct obd_import *revimp;
 876
 877         LASSERT(export->exp_imp_reverse == NULL);
 878
 879         revimp = class_new_import(obd);
 880         if (revimp == NULL)
 881                 return -ENOMEM;
 882
 883         revimp->imp_remote_handle.cookie = 0ULL;
 884         revimp->imp_client = &obd->obd_ldlm_client;
 885         revimp->imp_dlm_fake = 1;
 886
 887         /* it is safe to connect import in new state as no sends possible */
 888         spin_lock(&export->exp_lock);
 889         export->exp_imp_reverse = revimp;
 890         spin_unlock(&export->exp_lock);
 891         class_import_put(revimp);
 892
 893         return 0;
 894 }
 895 EXPORT_SYMBOL(rev_import_init);
 896
 897 /**
 898  * Handle reconnect for an export.
 899  *
 900  * \param exp export to handle reconnect process
 901  * \param req client reconnect request
 902  *
 903  * \retval -rc in case securitfy flavor can't be changed
 904  * \retval 0 in case none problems
 905  */
 906 static int rev_import_reconnect(struct obd_export *exp,
 907                                 struct ptlrpc_request *req)
 908 {
 909         struct obd_import *revimp = exp->exp_imp_reverse;
 910         struct lustre_handle *lh;
 911         int rc;
 912
 913         /* avoid sending a request until import flags are changed */
 914         ptlrpc_import_enter_resend(revimp);
 915
 916         if (revimp->imp_connection != NULL)
 917                 ptlrpc_connection_put(revimp->imp_connection);
 918
 919         /*
 920          * client from recovery don't have a handle so we need to take from
 921          * request. it may produce situation when wrong client connected
 922          * to recovery as we trust a client uuid
 923          */
 924         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 925         revimp->imp_remote_handle = *lh;
 926
 927         /* unknown versions will be caught in
 928          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
 929         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
 930
 931         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
 932
 933         rc = rev_import_flags_update(revimp, req);
 934         if (rc != 0) {
 935                 /* it is safe to still be in RECOVERY phase as we are not able
 936                  * to setup correct security flavor so requests are not able to
 937                  * be delivered correctly */
 938                 return rc;
 939         }
 940
 941         /* resend all rpc's via new connection */
 942         return ptlrpc_import_recovery_state_machine(revimp);
 943 }
 944
 945 int target_handle_connect(struct ptlrpc_request *req)
 946 {
 947         struct obd_device *target = NULL;
 948         struct obd_export *export = NULL;
 949         /* connect handle - filled from target_handle_reconnect in
 950          * reconnect case */
 951         struct lustre_handle conn;
 952         struct lustre_handle *tmp;
 953         struct obd_uuid tgtuuid;
 954         struct obd_uuid cluuid;
 955         char *str;
 956         int rc = 0;
 957         char *target_start;
 958         int target_len;
 959         bool     mds_conn = false, lw_client = false, initial_conn = false;
 960         bool     mds_mds_conn = false;
 961         bool     new_mds_mds_conn = false;
 962         bool     target_referenced = false;
 963         struct obd_connect_data *data, *tmpdata;
 964         int size, tmpsize;
 965         lnet_nid_t *client_nid = NULL;
 966         ENTRY;
 967
 968         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 969
 970         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 971         if (str == NULL) {
 972                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 973                 GOTO(out, rc = -EINVAL);
 974         }
 975
 976         obd_str2uuid(&tgtuuid, str);
 977         target = class_uuid2obd(&tgtuuid);
 978         if (!target)
 979                 target = class_name2obd(str);
 980
 981         if (!target) {
 982                 deuuidify(str, NULL, &target_start, &target_len);
 983                 LCONSOLE_ERROR_MSG(0x137, "%s: not available for connect "
 984                                    "from %s (no target). If you are running "
 985                                    "an HA pair check that the target is "
 986                                    "mounted on the other server.\n", str,
 987                                    libcfs_nid2str(req->rq_peer.nid));
 988                 GOTO(out, rc = -ENODEV);
 989         }
 990
 991         spin_lock(&target->obd_dev_lock);
 992         if (target->obd_stopping || !target->obd_set_up) {
 993                 spin_unlock(&target->obd_dev_lock);
 994
 995                 deuuidify(str, NULL, &target_start, &target_len);
 996                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
 997                               target_len, target_start,
 998                               libcfs_nid2str(req->rq_peer.nid),
 999                               (target->obd_stopping ?
1000                                "stopping" : "not set up"));
1001                 GOTO(out, rc = -ENODEV);
1002         }
1003
1004         if (target->obd_no_conn) {
1005                 spin_unlock(&target->obd_dev_lock);
1006
1007                 CDEBUG(D_INFO, "%s: Temporarily refusing client connection "
1008                                "from %s\n", target->obd_name,
1009                                libcfs_nid2str(req->rq_peer.nid));
1010                 GOTO(out, rc = -EAGAIN);
1011         }
1012
1013         /* Make sure the target isn't cleaned up while we're here. Yes,
1014          * there's still a race between the above check and our incref here.
1015          * Really, class_uuid2obd should take the ref. */
1016         class_incref(target, __func__, current);
1017         target_referenced = true;
1018
1019         target->obd_conn_inprogress++;
1020         spin_unlock(&target->obd_dev_lock);
1021
1022         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1023         if (str == NULL) {
1024                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1025                 GOTO(out, rc = -EINVAL);
1026         }
1027
1028         obd_str2uuid(&cluuid, str);
1029
1030         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1031         if (tmp == NULL)
1032                 GOTO(out, rc = -EPROTO);
1033
1034         conn = *tmp;
1035
1036         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1037                                     RCL_CLIENT);
1038         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1039         if (!data)
1040                 GOTO(out, rc = -EPROTO);
1041
1042         rc = req_capsule_server_pack(&req->rq_pill);
1043         if (rc)
1044                 GOTO(out, rc);
1045
1046 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1047         /* Don't allow clients to connect that are using old 1.8 format
1048          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1049          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1050          * FULL20 flag should be set on all connections since 2.0, but no
1051          * longer affects behaviour.
1052          *
1053          * Later this check will be disabled and the flag can be retired
1054          * completely once interop with 3.0 is no longer needed.
1055          */
1056         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1057                 GOTO(out, rc = -EPROTO);
1058 #endif
1059
1060         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1061                 if (data->ocd_version < LUSTRE_VERSION_CODE -
1062                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
1063                     data->ocd_version > LUSTRE_VERSION_CODE +
1064                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
1065                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
1066                                   "libclient connection attempt",
1067                                   data->ocd_version < LUSTRE_VERSION_CODE ?
1068                                   "old" : "new",
1069                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
1070                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
1071                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
1072                                   OBD_OCD_VERSION_FIX(data->ocd_version));
1073                         data = req_capsule_server_sized_get(&req->rq_pill,
1074                                                             &RMF_CONNECT_DATA,
1075                                     offsetof(typeof(*data), ocd_version) +
1076                                              sizeof(data->ocd_version));
1077                         if (data) {
1078                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
1079                                 data->ocd_version = LUSTRE_VERSION_CODE;
1080                         }
1081                         GOTO(out, rc = -EPROTO);
1082                 }
1083         }
1084
1085         /* Note: lw_client is needed in MDS-MDS failover during update log
1086          * processing, so we needs to allow lw_client to be connected at
1087          * anytime, instead of only the initial connection */
1088         lw_client = (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0;
1089
1090         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1091                 initial_conn = true;
1092                 mds_conn = (data->ocd_connect_flags & OBD_CONNECT_MDS) != 0;
1093                 mds_mds_conn = (data->ocd_connect_flags &
1094                                 OBD_CONNECT_MDS_MDS) != 0;
1095
1096                 /* OBD_CONNECT_MNE_SWAB is defined as OBD_CONNECT_MDS_MDS
1097                  * for Imperative Recovery connection from MGC to MGS.
1098                  *
1099                  * Via check OBD_CONNECT_FID, we can distinguish whether
1100                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1101                  * MGC or MDT. */
1102                 if (!lw_client &&
1103                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1104                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1105                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1106                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1107                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1108                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1109
1110                         /* We do not support the MDT-MDT interoperations with
1111                          * different version MDT because of protocol changes. */
1112                         if (unlikely(major != LUSTRE_MAJOR ||
1113                                      minor != LUSTRE_MINOR ||
1114                                      abs(patch - LUSTRE_PATCH) > 3)) {
1115                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the "
1116                                         "connection from different version MDT "
1117                                         "(%d.%d.%d.%d) %s %s\n",
1118                                         target->obd_name, LUSTRE_MAJOR,
1119                                         LUSTRE_MINOR, LUSTRE_PATCH, LUSTRE_FIX,
1120                                         major, minor, patch,
1121                                         OBD_OCD_VERSION_FIX(data->ocd_version),
1122                                         libcfs_nid2str(req->rq_peer.nid), str);
1123
1124                                 GOTO(out, rc = -EPROTO);
1125                         }
1126                 }
1127         }
1128
1129         /* lctl gets a backstage, all-access pass. */
1130         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1131                 goto dont_check_exports;
1132
1133         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
1134         if (!export)
1135                 goto no_export;
1136
1137         /* We've found an export in the hash. */
1138
1139         spin_lock(&export->exp_lock);
1140
1141         if (export->exp_connecting) { /* bug 9635, et. al. */
1142                 spin_unlock(&export->exp_lock);
1143                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1144                               export->exp_obd->obd_name, export,
1145                               libcfs_nid2str(req->rq_peer.nid));
1146                 class_export_put(export);
1147                 export = NULL;
1148                 rc = -EALREADY;
1149         } else if ((mds_conn || (lw_client && initial_conn) ||
1150                    data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1151                    export->exp_connection != NULL) {
1152                 spin_unlock(&export->exp_lock);
1153                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1154                         /* MDS or LWP reconnected after failover. */
1155                         LCONSOLE_WARN("%s: Received %s connection from "
1156                             "%s, removing former export from %s\n",
1157                             target->obd_name, mds_conn ? "MDS" : "LWP",
1158                             libcfs_nid2str(req->rq_peer.nid),
1159                             libcfs_nid2str(export->exp_connection->c_peer.nid));
1160                 } else {
1161                         /* New MDS connection from the same NID. */
1162                         LCONSOLE_WARN("%s: Received new %s connection from "
1163                                 "%s, removing former export from same NID\n",
1164                                 target->obd_name, mds_conn ? "MDS" : "LWP",
1165                                 libcfs_nid2str(req->rq_peer.nid));
1166                 }
1167
1168                 if (req->rq_peer.nid == export->exp_connection->c_peer.nid &&
1169                     data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
1170                         /* Because exports between MDTs will always be
1171                          * kept, let's do not fail such export if they
1172                          * come from the same NID, otherwise it might
1173                          * cause eviction between MDTs, which might
1174                          * cause namespace inconsistency */
1175                         spin_lock(&export->exp_lock);
1176                         export->exp_connecting = 1;
1177                         spin_unlock(&export->exp_lock);
1178                         conn.cookie = export->exp_handle.h_cookie;
1179                         rc = EALREADY;
1180                 } else {
1181                         class_fail_export(export);
1182                         class_export_put(export);
1183                         export = NULL;
1184                         rc = 0;
1185                 }
1186         } else if (export->exp_connection != NULL && initial_conn &&
1187                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1188                 spin_unlock(&export->exp_lock);
1189                 /* In MDS failover we have static UUID but NID can change. */
1190                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when "
1191                               "existing nid %s is already connected\n",
1192                               target->obd_name, cluuid.uuid,
1193                               libcfs_nid2str(req->rq_peer.nid),
1194                               libcfs_nid2str(
1195                                       export->exp_connection->c_peer.nid));
1196                 rc = -EALREADY;
1197                 class_export_put(export);
1198                 export = NULL;
1199         } else {
1200                 export->exp_connecting = 1;
1201                 spin_unlock(&export->exp_lock);
1202                 LASSERT(export->exp_obd == target);
1203
1204                 rc = target_handle_reconnect(&conn, export, &cluuid);
1205         }
1206
1207         /* If we found an export, we already unlocked. */
1208         if (!export) {
1209 no_export:
1210                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1211         } else if (req->rq_export == NULL &&
1212                    atomic_read(&export->exp_rpc_count) > 0) {
1213                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, "
1214                               "still busy with %d references\n",
1215                               target->obd_name, cluuid.uuid,
1216                               libcfs_nid2str(req->rq_peer.nid),
1217                               atomic_read(&export->exp_refcount));
1218                 GOTO(out, rc = -EBUSY);
1219         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
1220                 if (!strstr(cluuid.uuid, "mdt"))
1221                         LCONSOLE_WARN("%s: Rejecting reconnect from the "
1222                                       "known client %s (at %s) because it "
1223                                       "is indicating it is a new client",
1224                                       target->obd_name, cluuid.uuid,
1225                                       libcfs_nid2str(req->rq_peer.nid));
1226                 GOTO(out, rc = -EALREADY);
1227         } else {
1228                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1229         }
1230
1231         if (rc < 0) {
1232                 GOTO(out, rc);
1233         }
1234
1235         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %ld last %ld\n",
1236                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1237               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1238               export, (long)cfs_time_current_sec(),
1239               export ? (long)export->exp_last_request_time : 0);
1240
1241         /* If this is the first time a client connects, reset the recovery
1242          * timer. Discard lightweight connections which might be local. */
1243         if (!lw_client && rc == 0 && target->obd_recovering)
1244                 check_and_start_recovery_timer(target, req, export == NULL);
1245
1246         /* We want to handle EALREADY but *not* -EALREADY from
1247          * target_handle_reconnect(), return reconnection state in a flag. */
1248         if (rc == EALREADY) {
1249                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1250                 rc = 0;
1251         } else {
1252                 LASSERT(rc == 0);
1253         }
1254
1255         /* Tell the client if we support replayable requests. */
1256         if (target->obd_replayable)
1257                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1258         client_nid = &req->rq_peer.nid;
1259
1260         if (export == NULL) {
1261                 /* allow lightweight connections during recovery */
1262                 /* allow "new" MDT to be connected during recovery, since we
1263                  * need retrieve recovery update records from it */
1264                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1265                         cfs_time_t t;
1266                         int     c; /* connected */
1267                         int     i; /* in progress */
1268                         int     k; /* known */
1269                         int     s; /* stale/evicted */
1270
1271                         c = atomic_read(&target->obd_connected_clients);
1272                         i = atomic_read(&target->obd_lock_replay_clients);
1273                         k = target->obd_max_recoverable_clients;
1274                         s = target->obd_stale_clients;
1275                         t = target->obd_recovery_timer.expires;
1276                         t = cfs_time_sub(t, cfs_time_current());
1277                         t = cfs_duration_sec(t);
1278                         LCONSOLE_WARN("%s: Denying connection for new client %s"
1279                                       "(at %s), waiting for %d known clients "
1280                                       "(%d recovered, %d in progress, and %d "
1281                                       "evicted) to recover in %d:%.02d\n",
1282                                       target->obd_name, cluuid.uuid,
1283                                       libcfs_nid2str(req->rq_peer.nid), k,
1284                                       c - i, i, s, (int)t / 60,
1285                                       (int)t % 60);
1286                         rc = -EBUSY;
1287                 } else {
1288 dont_check_exports:
1289                         rc = obd_connect(req->rq_svc_thread->t_env,
1290                                          &export, target, &cluuid, data,
1291                                          client_nid);
1292                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1293                                 lustre_msg_add_op_flags(req->rq_repmsg,
1294                                                         MSG_CONNECT_RECOVERING);
1295                         if (rc == 0) {
1296                                 conn.cookie = export->exp_handle.h_cookie;
1297                                 rc = rev_import_init(export);
1298                         }
1299
1300                         if (mds_mds_conn)
1301                                 new_mds_mds_conn = true;
1302                 }
1303         } else {
1304                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1305                                    export, target, &cluuid, data, client_nid);
1306         }
1307         if (rc)
1308                 GOTO(out, rc);
1309
1310         LASSERT(target->u.obt.obt_magic == OBT_MAGIC);
1311         data->ocd_instance = target->u.obt.obt_instance;
1312
1313         /* Return only the parts of obd_connect_data that we understand, so the
1314          * client knows that we don't understand the rest. */
1315         if (data) {
1316                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1317                                                RCL_SERVER);
1318                 tmpdata = req_capsule_server_get(&req->rq_pill,
1319                                                  &RMF_CONNECT_DATA);
1320                 /* Don't use struct assignment here, because the client reply
1321                  * buffer may be smaller/larger than the local struct
1322                  * obd_connect_data. */
1323                 memcpy(tmpdata, data, min(tmpsize, size));
1324         }
1325
1326         /* If the client and the server are the same node, we will already
1327          * have an export that really points to the client's DLM export,
1328          * because we have a shared handles table.
1329          *
1330          * XXX this will go away when shaver stops sending the "connect" handle
1331          * in the real "remote handle" field of the request --phik 24 Apr 2003
1332          */
1333         ptlrpc_request_change_export(req, export);
1334
1335         spin_lock(&export->exp_lock);
1336         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1337                 spin_unlock(&export->exp_lock);
1338                 CDEBUG(D_RPCTRACE, "%s: %s already connected at greater "
1339                        "or equal conn_cnt: %d >= %d\n",
1340                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1341                        export->exp_conn_cnt,
1342                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1343
1344                 GOTO(out, rc = -EALREADY);
1345         }
1346         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1347         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1348
1349         /* Don't evict liblustre clients for not pinging. */
1350         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1351                 export->exp_libclient = 1;
1352                 spin_unlock(&export->exp_lock);
1353
1354                 spin_lock(&target->obd_dev_lock);
1355                 list_del_init(&export->exp_obd_chain_timed);
1356                 spin_unlock(&target->obd_dev_lock);
1357         } else {
1358                 spin_unlock(&export->exp_lock);
1359         }
1360
1361         if (export->exp_connection != NULL) {
1362                 /* Check to see if connection came from another NID. */
1363                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
1364                     !hlist_unhashed(&export->exp_nid_hash))
1365                         cfs_hash_del(export->exp_obd->obd_nid_hash,
1366                                      &export->exp_connection->c_peer.nid,
1367                                      &export->exp_nid_hash);
1368
1369                 ptlrpc_connection_put(export->exp_connection);
1370         }
1371
1372         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
1373                                                        req->rq_self,
1374                                                        &cluuid);
1375         if (hlist_unhashed(&export->exp_nid_hash))
1376                 cfs_hash_add(export->exp_obd->obd_nid_hash,
1377                              &export->exp_connection->c_peer.nid,
1378                              &export->exp_nid_hash);
1379
1380         lustre_msg_set_handle(req->rq_repmsg, &conn);
1381
1382         rc = rev_import_reconnect(export, req);
1383         if (rc != 0)
1384                 GOTO(out, rc);
1385
1386         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1387                 int has_transno;
1388                 __u64 transno = data->ocd_transno;
1389
1390                 spin_lock(&export->exp_lock);
1391                 /* possible race with class_disconnect_stale_exports,
1392                  * export may be already in the eviction process */
1393                 if (export->exp_failed) {
1394                         spin_unlock(&export->exp_lock);
1395                         GOTO(out, rc = -ENODEV);
1396                 }
1397                 export->exp_in_recovery = 1;
1398                 export->exp_req_replay_needed = 1;
1399                 export->exp_lock_replay_needed = 1;
1400                 spin_unlock(&export->exp_lock);
1401
1402                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1403                                  MSG_CONNECT_TRANSNO);
1404                 if (has_transno && transno == 0)
1405                         CWARN("Connect with zero transno!\n");
1406
1407                 if (has_transno && transno > 0 &&
1408                     transno < target->obd_next_recovery_transno &&
1409                     transno > target->obd_last_committed) {
1410                         /* Another way is to use cmpxchg() to be lock-free. */
1411                         spin_lock(&target->obd_recovery_task_lock);
1412                         if (transno < target->obd_next_recovery_transno)
1413                                 target->obd_next_recovery_transno = transno;
1414                         spin_unlock(&target->obd_recovery_task_lock);
1415                 }
1416
1417                 atomic_inc(&target->obd_req_replay_clients);
1418                 atomic_inc(&target->obd_lock_replay_clients);
1419                 /* Note: MDS-MDS connection is allowed to be connected during
1420                  * recovery, no matter if the exports needs to be recoveried.
1421                  * Because we need retrieve updates logs from all other MDTs.
1422                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1423                  * also needs to be increased to match other recovery checking
1424                  * condition. */
1425                 if (new_mds_mds_conn)
1426                         target->obd_max_recoverable_clients++;
1427                 if (atomic_inc_return(&target->obd_connected_clients) ==
1428                     target->obd_max_recoverable_clients)
1429                         wake_up(&target->obd_next_transno_waitq);
1430         }
1431
1432         /* Tell the client we're in recovery, when client is involved in it. */
1433         if (target->obd_recovering && !lw_client)
1434                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1435
1436 out:
1437         if (export) {
1438                 spin_lock(&export->exp_lock);
1439                 export->exp_connecting = 0;
1440                 spin_unlock(&export->exp_lock);
1441
1442                 class_export_put(export);
1443         }
1444         if (target_referenced == true && target != NULL) {
1445                 spin_lock(&target->obd_dev_lock);
1446                 target->obd_conn_inprogress--;
1447                 spin_unlock(&target->obd_dev_lock);
1448
1449                 class_decref(target, __func__, current);
1450         }
1451         req->rq_status = rc;
1452         RETURN(rc);
1453 }
1454
1455 int target_handle_disconnect(struct ptlrpc_request *req)
1456 {
1457         int rc;
1458         ENTRY;
1459
1460         rc = req_capsule_server_pack(&req->rq_pill);
1461         if (rc)
1462                 RETURN(rc);
1463
1464         /* Keep the rq_export around so we can send the reply. */
1465         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1466
1467         RETURN(0);
1468 }
1469
1470 void target_destroy_export(struct obd_export *exp)
1471 {
1472         struct obd_import       *imp = NULL;
1473         /* exports created from last_rcvd data, and "fake"
1474            exports created by lctl don't have an import */
1475         spin_lock(&exp->exp_lock);
1476         if (exp->exp_imp_reverse != NULL) {
1477                 imp = exp->exp_imp_reverse;
1478                 exp->exp_imp_reverse = NULL;
1479         }
1480         spin_unlock(&exp->exp_lock);
1481         if (imp != NULL)
1482                 client_destroy_import(imp);
1483
1484         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1485         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1486         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1487         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1488 }
1489 EXPORT_SYMBOL(target_destroy_export);
1490
1491 /*
1492  * Recovery functions
1493  */
1494 static void target_request_copy_get(struct ptlrpc_request *req)
1495 {
1496         class_export_rpc_inc(req->rq_export);
1497         LASSERT(list_empty(&req->rq_list));
1498         INIT_LIST_HEAD(&req->rq_replay_list);
1499
1500         /* Increase refcount to keep request in queue. */
1501         atomic_inc(&req->rq_refcount);
1502         /* Let export know it has replays to be handled. */
1503         atomic_inc(&req->rq_export->exp_replay_count);
1504 }
1505
1506 static void target_request_copy_put(struct ptlrpc_request *req)
1507 {
1508         LASSERT(list_empty(&req->rq_replay_list));
1509         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1510
1511         atomic_dec(&req->rq_export->exp_replay_count);
1512         class_export_rpc_dec(req->rq_export);
1513         ptlrpc_server_drop_request(req);
1514 }
1515
1516 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1517 {
1518         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1519         struct obd_export     *exp = req->rq_export;
1520         struct ptlrpc_request *reqiter;
1521         struct ptlrpc_request *dup_req = NULL;
1522         int                    dup = 0;
1523
1524         LASSERT(exp);
1525
1526         spin_lock(&exp->exp_lock);
1527         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1528                                 rq_replay_list) {
1529                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1530                         dup_req = reqiter;
1531                         dup = 1;
1532                         break;
1533                 }
1534         }
1535
1536         if (dup) {
1537                 /* We expect it with RESENT and REPLAY flags. */
1538                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1539                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1540                         CERROR("invalid flags %x of resent replay\n",
1541                                lustre_msg_get_flags(req->rq_reqmsg));
1542
1543                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1544                         __u32 new_conn;
1545
1546                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1547                         if (new_conn >
1548                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1549                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1550                                                         new_conn);
1551                 }
1552         } else {
1553                 list_add_tail(&req->rq_replay_list,
1554                                   &exp->exp_req_replay_queue);
1555         }
1556
1557         spin_unlock(&exp->exp_lock);
1558         return dup;
1559 }
1560
1561 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1562 {
1563         LASSERT(!list_empty(&req->rq_replay_list));
1564         LASSERT(req->rq_export);
1565
1566         spin_lock(&req->rq_export->exp_lock);
1567         list_del_init(&req->rq_replay_list);
1568         spin_unlock(&req->rq_export->exp_lock);
1569 }
1570
1571 static void target_finish_recovery(struct lu_target *lut)
1572 {
1573         struct obd_device *obd = lut->lut_obd;
1574         ENTRY;
1575
1576         /* Only log a recovery message when recovery has occurred. */
1577         if (obd->obd_recovery_start) {
1578                 time64_t now = ktime_get_real_seconds();
1579                 time64_t elapsed_time;
1580
1581                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start, 1);
1582                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients "
1583                         "%d recovered and %d %s evicted.\n", obd->obd_name,
1584                         (s64)elapsed_time / 60, (s64)elapsed_time % 60,
1585                         obd->obd_max_recoverable_clients,
1586                         atomic_read(&obd->obd_connected_clients),
1587                         obd->obd_stale_clients,
1588                         obd->obd_stale_clients == 1 ? "was" : "were");
1589         }
1590
1591         ldlm_reprocess_recovery_done(obd->obd_namespace);
1592         spin_lock(&obd->obd_recovery_task_lock);
1593         if (!list_empty(&obd->obd_req_replay_queue) ||
1594             !list_empty(&obd->obd_lock_replay_queue) ||
1595             !list_empty(&obd->obd_final_req_queue)) {
1596                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1597                        obd->obd_name,
1598                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1599                        list_empty(&obd->obd_lock_replay_queue) ? \
1600                                "" : "lock ",
1601                        list_empty(&obd->obd_final_req_queue) ? \
1602                                "" : "final ");
1603                 spin_unlock(&obd->obd_recovery_task_lock);
1604                 LBUG();
1605         }
1606         spin_unlock(&obd->obd_recovery_task_lock);
1607
1608         obd->obd_recovery_end = ktime_get_real_seconds();
1609
1610         /* When recovery finished, cleanup orphans on MDS and OST. */
1611         if (OBT(obd) && OBP(obd, postrecov)) {
1612                 int rc = OBP(obd, postrecov)(obd);
1613                 if (rc < 0)
1614                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1615                                       obd->obd_name, rc);
1616         }
1617         EXIT;
1618 }
1619
1620 static void abort_req_replay_queue(struct obd_device *obd)
1621 {
1622         struct ptlrpc_request *req, *n;
1623         struct list_head abort_list;
1624
1625         INIT_LIST_HEAD(&abort_list);
1626         spin_lock(&obd->obd_recovery_task_lock);
1627         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1628         spin_unlock(&obd->obd_recovery_task_lock);
1629         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1630                 DEBUG_REQ(D_WARNING, req, "aborted:");
1631                 req->rq_status = -ENOTCONN;
1632                 if (ptlrpc_error(req)) {
1633                         DEBUG_REQ(D_ERROR, req,
1634                                   "failed abort_req_reply; skipping");
1635                 }
1636                 target_exp_dequeue_req_replay(req);
1637                 target_request_copy_put(req);
1638         }
1639 }
1640
1641 static void abort_lock_replay_queue(struct obd_device *obd)
1642 {
1643         struct ptlrpc_request *req, *n;
1644         struct list_head abort_list;
1645
1646         INIT_LIST_HEAD(&abort_list);
1647         spin_lock(&obd->obd_recovery_task_lock);
1648         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1649         spin_unlock(&obd->obd_recovery_task_lock);
1650         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1651                 DEBUG_REQ(D_ERROR, req, "aborted:");
1652                 req->rq_status = -ENOTCONN;
1653                 if (ptlrpc_error(req)) {
1654                         DEBUG_REQ(D_ERROR, req,
1655                                   "failed abort_lock_reply; skipping");
1656                 }
1657                 target_request_copy_put(req);
1658         }
1659 }
1660
1661 /* Called from a cleanup function if the device is being cleaned up
1662    forcefully.  The exports should all have been disconnected already,
1663    the only thing left to do is
1664      - clear the recovery flags
1665      - cancel the timer
1666      - free queued requests and replies, but don't send replies
1667    Because the obd_stopping flag is set, no new requests should be received.
1668
1669 */
1670 void target_cleanup_recovery(struct obd_device *obd)
1671 {
1672         struct ptlrpc_request *req, *n;
1673         struct list_head clean_list;
1674
1675         INIT_LIST_HEAD(&clean_list);
1676         spin_lock(&obd->obd_dev_lock);
1677         if (!obd->obd_recovering) {
1678                 spin_unlock(&obd->obd_dev_lock);
1679                 EXIT;
1680                 return;
1681         }
1682         obd->obd_recovering = obd->obd_abort_recovery = 0;
1683         spin_unlock(&obd->obd_dev_lock);
1684
1685         spin_lock(&obd->obd_recovery_task_lock);
1686         target_cancel_recovery_timer(obd);
1687         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1688         spin_unlock(&obd->obd_recovery_task_lock);
1689
1690         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1691                 LASSERT(req->rq_reply_state == NULL);
1692                 target_exp_dequeue_req_replay(req);
1693                 target_request_copy_put(req);
1694         }
1695
1696         spin_lock(&obd->obd_recovery_task_lock);
1697         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1698         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1699         spin_unlock(&obd->obd_recovery_task_lock);
1700
1701         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1702                 LASSERT(req->rq_reply_state == NULL);
1703                 target_request_copy_put(req);
1704         }
1705
1706         EXIT;
1707 }
1708 EXPORT_SYMBOL(target_cleanup_recovery);
1709
1710 /* obd_recovery_task_lock should be held */
1711 void target_cancel_recovery_timer(struct obd_device *obd)
1712 {
1713         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1714         del_timer(&obd->obd_recovery_timer);
1715 }
1716
1717 static void target_start_recovery_timer(struct obd_device *obd)
1718 {
1719         if (obd->obd_recovery_start != 0)
1720                 return;
1721
1722         spin_lock(&obd->obd_dev_lock);
1723         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1724                 spin_unlock(&obd->obd_dev_lock);
1725                 return;
1726         }
1727
1728         LASSERT(obd->obd_recovery_timeout != 0);
1729
1730         if (obd->obd_recovery_start != 0) {
1731                 spin_unlock(&obd->obd_dev_lock);
1732                 return;
1733         }
1734
1735         mod_timer(&obd->obd_recovery_timer,
1736                   cfs_time_shift(obd->obd_recovery_timeout));
1737         obd->obd_recovery_start = ktime_get_real_seconds();
1738         spin_unlock(&obd->obd_dev_lock);
1739
1740         LCONSOLE_WARN("%s: Will be in recovery for at least %llu:%02llu, or until %d client%s reconnect%s\n",
1741                       obd->obd_name,
1742                       obd->obd_recovery_timeout / 60,
1743                       obd->obd_recovery_timeout % 60,
1744                       obd->obd_max_recoverable_clients,
1745                       (obd->obd_max_recoverable_clients == 1) ? "" : "s",
1746                       (obd->obd_max_recoverable_clients == 1) ? "s": "");
1747 }
1748
1749 /**
1750  * extend recovery window.
1751  *
1752  * if @extend is true, extend recovery window to have @drt remaining at least;
1753  * otherwise, make sure the recovery timeout value is not less than @drt.
1754  */
1755 static void extend_recovery_timer(struct obd_device *obd, int drt,
1756                                   bool extend)
1757 {
1758         time64_t now;
1759         time64_t end;
1760         time64_t left;
1761         time64_t to;
1762
1763         spin_lock(&obd->obd_dev_lock);
1764         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1765                 spin_unlock(&obd->obd_dev_lock);
1766                 return;
1767         }
1768         LASSERT(obd->obd_recovery_start != 0);
1769
1770         now = ktime_get_real_seconds();
1771         to = obd->obd_recovery_timeout;
1772         end = obd->obd_recovery_start + to;
1773         left = end - now;
1774
1775         if (extend && (drt > left)) {
1776                 to += drt - left;
1777         } else if (!extend && (drt > to)) {
1778                 to = drt;
1779         }
1780
1781         if (to > obd->obd_recovery_time_hard) {
1782                 to = obd->obd_recovery_time_hard;
1783                 CWARN("%s: extended recovery timer reaching hard limit: %lld, extend: %d\n",
1784                       obd->obd_name, to, extend);
1785         }
1786
1787         if (obd->obd_recovery_timeout < to) {
1788                 obd->obd_recovery_timeout = to;
1789                 end = obd->obd_recovery_start + to;
1790                 mod_timer(&obd->obd_recovery_timer,
1791                           cfs_time_shift(end - now));
1792         }
1793         spin_unlock(&obd->obd_dev_lock);
1794
1795         CDEBUG(D_HA, "%s: recovery timer will expire in %lld seconds\n",
1796                 obd->obd_name, (s64)(end - now));
1797 }
1798
1799 /* Reset the timer with each new client connection */
1800 /*
1801  * This timer is actually reconnect_timer, which is for making sure
1802  * the total recovery window is at least as big as my reconnect
1803  * attempt timing. So the initial recovery time_out will be set to
1804  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1805  * from client is bigger than this, then the recovery time_out will
1806  * be extended to make sure the client could be reconnected, in the
1807  * process, the timeout from the new client should be ignored.
1808  */
1809
1810 static void
1811 check_and_start_recovery_timer(struct obd_device *obd,
1812                                struct ptlrpc_request *req,
1813                                int new_client)
1814 {
1815         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1816         struct obd_device_target *obt = &obd->u.obt;
1817
1818         if (!new_client && service_time)
1819                 /* Teach server about old server's estimates, as first guess
1820                  * at how long new requests will take. */
1821                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
1822                             service_time);
1823
1824         target_start_recovery_timer(obd);
1825
1826         /* Convert the service time to RPC timeout,
1827          * and reuse service_time to limit stack usage. */
1828         service_time = at_est2timeout(service_time);
1829
1830         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
1831             service_time < at_extra)
1832                 service_time = at_extra;
1833
1834         /* We expect other clients to timeout within service_time, then try
1835          * to reconnect, then try the failover server.  The max delay between
1836          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL. */
1837         service_time += 2 * INITIAL_CONNECT_TIMEOUT;
1838
1839         LASSERT(obt->obt_magic == OBT_MAGIC);
1840         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
1841         if (service_time > obd->obd_recovery_timeout && !new_client)
1842                 extend_recovery_timer(obd, service_time, false);
1843 }
1844
1845 /** Health checking routines */
1846 static inline int exp_connect_healthy(struct obd_export *exp)
1847 {
1848         return (exp->exp_in_recovery);
1849 }
1850
1851 /** if export done req_replay or has replay in queue */
1852 static inline int exp_req_replay_healthy(struct obd_export *exp)
1853 {
1854         return (!exp->exp_req_replay_needed ||
1855                 atomic_read(&exp->exp_replay_count) > 0);
1856 }
1857
1858
1859 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
1860 {
1861         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1862                exp_req_replay_healthy(exp);
1863 }
1864
1865 /** if export done lock_replay or has replay in queue */
1866 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1867 {
1868         return (!exp->exp_lock_replay_needed ||
1869                 atomic_read(&exp->exp_replay_count) > 0);
1870 }
1871
1872 static inline int exp_vbr_healthy(struct obd_export *exp)
1873 {
1874         return (!exp->exp_vbr_failed);
1875 }
1876
1877 static inline int exp_finished(struct obd_export *exp)
1878 {
1879         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1880 }
1881
1882 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
1883 {
1884         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1885                 exp_finished(exp);
1886 }
1887
1888 static int check_for_next_transno(struct lu_target *lut)
1889 {
1890         struct ptlrpc_request *req = NULL;
1891         struct obd_device *obd = lut->lut_obd;
1892         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
1893         int wake_up = 0, connected, completed, queue_len;
1894         __u64 req_transno = 0;
1895         __u64 update_transno = 0;
1896         __u64 next_transno = 0;
1897         ENTRY;
1898
1899         spin_lock(&obd->obd_recovery_task_lock);
1900         if (!list_empty(&obd->obd_req_replay_queue)) {
1901                 req = list_entry(obd->obd_req_replay_queue.next,
1902                                      struct ptlrpc_request, rq_list);
1903                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1904         }
1905
1906         if (tdtd != NULL)
1907                 update_transno = distribute_txn_get_next_transno(tdtd);
1908
1909         connected = atomic_read(&obd->obd_connected_clients);
1910         completed = connected - atomic_read(&obd->obd_req_replay_clients);
1911         queue_len = obd->obd_requests_queued_for_recovery;
1912         next_transno = obd->obd_next_recovery_transno;
1913
1914         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1915                "req_transno: %llu, next_transno: %llu\n",
1916                obd->obd_max_recoverable_clients, connected, completed,
1917                queue_len, req_transno, next_transno);
1918
1919         if (obd->obd_abort_recovery) {
1920                 CDEBUG(D_HA, "waking for aborted recovery\n");
1921                 wake_up = 1;
1922         } else if (obd->obd_recovery_expired) {
1923                 CDEBUG(D_HA, "waking for expired recovery\n");
1924                 wake_up = 1;
1925         } else if (tdtd != NULL && req != NULL &&
1926                    is_req_replayed_by_update(req)) {
1927                 LASSERTF(req_transno < next_transno, "req_transno %llu"
1928                          "next_transno%llu\n", req_transno, next_transno);
1929                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
1930                        req_transno);
1931                 wake_up = 1;
1932         } else if (req_transno == next_transno ||
1933                    (update_transno != 0 && update_transno <= next_transno)) {
1934                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
1935                 wake_up = 1;
1936         } else if (queue_len > 0 &&
1937                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1938                 /** handle gaps occured due to lost reply or VBR */
1939                 LASSERTF(req_transno >= next_transno,
1940                          "req_transno: %llu, next_transno: %llu\n",
1941                          req_transno, next_transno);
1942                 CDEBUG(D_HA,
1943                        "%s: waking for gap in transno, VBR is %s (skip: "
1944                        "%lld, ql: %d, comp: %d, conn: %d, next: %lld"
1945                        ", next_update %lld last_committed: %lld)\n",
1946                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1947                        next_transno, queue_len, completed, connected,
1948                        req_transno, update_transno, obd->obd_last_committed);
1949                 obd->obd_next_recovery_transno = req_transno;
1950                 wake_up = 1;
1951         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1952                 CDEBUG(D_HA, "waking for completed recovery\n");
1953                 wake_up = 1;
1954         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1955                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1956                        " by fail_lock, waking up (%lld)\n", next_transno);
1957                 obd->obd_next_recovery_transno = req_transno;
1958                 wake_up = 1;
1959         }
1960         spin_unlock(&obd->obd_recovery_task_lock);
1961         return wake_up;
1962 }
1963
1964 static int check_for_next_lock(struct lu_target *lut)
1965 {
1966         struct obd_device *obd = lut->lut_obd;
1967         int wake_up = 0;
1968
1969         spin_lock(&obd->obd_recovery_task_lock);
1970         if (!list_empty(&obd->obd_lock_replay_queue)) {
1971                 CDEBUG(D_HA, "waking for next lock\n");
1972                 wake_up = 1;
1973         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1974                 CDEBUG(D_HA, "waking for completed lock replay\n");
1975                 wake_up = 1;
1976         } else if (obd->obd_abort_recovery) {
1977                 CDEBUG(D_HA, "waking for aborted recovery\n");
1978                 wake_up = 1;
1979         } else if (obd->obd_recovery_expired) {
1980                 CDEBUG(D_HA, "waking for expired recovery\n");
1981                 wake_up = 1;
1982         }
1983         spin_unlock(&obd->obd_recovery_task_lock);
1984
1985         return wake_up;
1986 }
1987
1988 /**
1989  * wait for recovery events,
1990  * check its status with help of check_routine
1991  * evict dead clients via health_check
1992  */
1993 static int target_recovery_overseer(struct lu_target *lut,
1994                                     int (*check_routine)(struct lu_target *),
1995                                     int (*health_check)(struct obd_export *))
1996 {
1997         struct obd_device       *obd = lut->lut_obd;
1998         struct target_distribute_txn_data *tdtd;
1999 repeat:
2000         if (obd->obd_recovery_start != 0 && ktime_get_real_seconds() >=
2001               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
2002                 __u64 next_update_transno = 0;
2003
2004                 /* Only abort the recovery if there are no update recovery
2005                  * left in the queue */
2006                 spin_lock(&obd->obd_recovery_task_lock);
2007                 if (lut->lut_tdtd != NULL) {
2008                         next_update_transno =
2009                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2010
2011                         tdtd = lut->lut_tdtd;
2012                         /* If next_update_transno == 0, it probably because
2013                          * updatelog retrieve threads did not get any records
2014                          * yet, let's wait those threads stopped */
2015                         if (next_update_transno == 0) {
2016                                 struct l_wait_info lwi = { 0 };
2017
2018                                 l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2019                                        atomic_read(
2020                                        &tdtd->tdtd_recovery_threads_count) == 0,
2021                                        &lwi);
2022
2023                                 next_update_transno =
2024                                         distribute_txn_get_next_transno(
2025                                                                 lut->lut_tdtd);
2026                         }
2027                 }
2028
2029                 if (next_update_transno != 0 && !obd->obd_abort_recovery) {
2030                         obd->obd_next_recovery_transno = next_update_transno;
2031                         spin_unlock(&obd->obd_recovery_task_lock);
2032                         /* Disconnect unfinished exports from clients, and
2033                          * keep connection from MDT to make sure the update
2034                          * recovery will still keep trying until some one
2035                          * manually abort the recovery */
2036                         class_disconnect_stale_exports(obd,
2037                                                 exp_finished_or_from_mdt);
2038                         /* Abort all of replay and replay lock req from
2039                          * clients */
2040                         abort_req_replay_queue(obd);
2041                         abort_lock_replay_queue(obd);
2042                         CDEBUG(D_HA, "%s: there are still update replay (%#llx"
2043                                ")in the queue.\n", obd->obd_name,
2044                                next_update_transno);
2045                 } else {
2046                         obd->obd_abort_recovery = 1;
2047                         spin_unlock(&obd->obd_recovery_task_lock);
2048                         CWARN("%s recovery is aborted by hard timeout\n",
2049                               obd->obd_name);
2050                 }
2051         }
2052
2053         while (wait_event_timeout(obd->obd_next_transno_waitq,
2054                                   check_routine(lut),
2055                                   msecs_to_jiffies(60 * MSEC_PER_SEC)) == 0)
2056                 /* wait indefinitely for event, but don't trigger watchdog */;
2057
2058         if (obd->obd_abort_recovery) {
2059                 CWARN("recovery is aborted, evict exports in recovery\n");
2060                 if (lut->lut_tdtd != NULL) {
2061                         struct l_wait_info lwi = { 0 };
2062
2063                         tdtd = lut->lut_tdtd;
2064                         /* Let's wait all of the update log recovery thread
2065                          * finished */
2066                         l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2067                          atomic_read(&tdtd->tdtd_recovery_threads_count) == 0,
2068                              &lwi);
2069                         /* Then abort the update recovery list */
2070                         dtrq_list_destroy(lut->lut_tdtd);
2071                 }
2072
2073                 /** evict exports which didn't finish recovery yet */
2074                 class_disconnect_stale_exports(obd, exp_finished);
2075                 return 1;
2076         } else if (obd->obd_recovery_expired) {
2077                 obd->obd_recovery_expired = 0;
2078                 /** If some clients died being recovered, evict them */
2079                 LCONSOLE_WARN("%s: recovery is timed out, "
2080                               "evict stale exports\n", obd->obd_name);
2081                 /** evict cexports with no replay in queue, they are stalled */
2082                 class_disconnect_stale_exports(obd, health_check);
2083
2084                 /** continue with VBR */
2085                 spin_lock(&obd->obd_dev_lock);
2086                 obd->obd_version_recov = 1;
2087                 spin_unlock(&obd->obd_dev_lock);
2088                 /**
2089                  * reset timer, recovery will proceed with versions now,
2090                  * timeout is set just to handle reconnection delays
2091                  */
2092                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2093                 /** Wait for recovery events again, after evicting bad clients */
2094                 goto repeat;
2095         }
2096         return 0;
2097 }
2098
2099 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2100 {
2101         struct obd_device       *obd = lut->lut_obd;
2102         struct ptlrpc_request *req = NULL;
2103
2104         CDEBUG(D_HA, "Waiting for lock\n");
2105         if (target_recovery_overseer(lut, check_for_next_lock,
2106                                      exp_lock_replay_healthy))
2107                 abort_lock_replay_queue(obd);
2108
2109         spin_lock(&obd->obd_recovery_task_lock);
2110         if (!list_empty(&obd->obd_lock_replay_queue)) {
2111                 req = list_entry(obd->obd_lock_replay_queue.next,
2112                                      struct ptlrpc_request, rq_list);
2113                 list_del_init(&req->rq_list);
2114                 spin_unlock(&obd->obd_recovery_task_lock);
2115         } else {
2116                 spin_unlock(&obd->obd_recovery_task_lock);
2117                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2118                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2119                 /** evict exports failed VBR */
2120                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2121         }
2122         return req;
2123 }
2124
2125 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2126 {
2127         struct ptlrpc_request *req = NULL;
2128
2129         spin_lock(&obd->obd_recovery_task_lock);
2130         if (!list_empty(&obd->obd_final_req_queue)) {
2131                 req = list_entry(obd->obd_final_req_queue.next,
2132                                      struct ptlrpc_request, rq_list);
2133                 list_del_init(&req->rq_list);
2134                 spin_unlock(&obd->obd_recovery_task_lock);
2135                 if (req->rq_export->exp_in_recovery) {
2136                         spin_lock(&req->rq_export->exp_lock);
2137                         req->rq_export->exp_in_recovery = 0;
2138                         spin_unlock(&req->rq_export->exp_lock);
2139                 }
2140         } else {
2141                 spin_unlock(&obd->obd_recovery_task_lock);
2142         }
2143         return req;
2144 }
2145
2146 static void handle_recovery_req(struct ptlrpc_thread *thread,
2147                                 struct ptlrpc_request *req,
2148                                 svc_handler_t handler)
2149 {
2150         ENTRY;
2151
2152         /**
2153          * export can be evicted during recovery, no need to handle replays for
2154          * it after that, discard such request silently
2155          */
2156         if (req->rq_export->exp_disconnected)
2157                 RETURN_EXIT;
2158
2159         req->rq_session.lc_thread = thread;
2160         req->rq_svc_thread = thread;
2161         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2162
2163         /* thread context */
2164         lu_context_enter(&thread->t_env->le_ctx);
2165         (void)handler(req);
2166         lu_context_exit(&thread->t_env->le_ctx);
2167
2168         /* don't reset timer for final stage */
2169         if (!exp_finished(req->rq_export)) {
2170                 int to = obd_timeout;
2171
2172                 /**
2173                  * Add request timeout to the recovery time so next request from
2174                  * this client may come in recovery time
2175                  */
2176                 if (!AT_OFF) {
2177                         struct ptlrpc_service_part *svcpt;
2178
2179                         svcpt = req->rq_rqbd->rqbd_svcpt;
2180                         /* If the server sent early reply for this request,
2181                          * the client will recalculate the timeout according to
2182                          * current server estimate service time, so we will
2183                          * use the maxium timeout here for waiting the client
2184                          * sending the next req */
2185                         to = max((int)at_est2timeout(
2186                                  at_get(&svcpt->scp_at_estimate)),
2187                                  (int)lustre_msg_get_timeout(req->rq_reqmsg));
2188                         /* Add 2 net_latency, one for balance rq_deadline
2189                          * (see ptl_send_rpc), one for resend the req to server,
2190                          * Note: client will pack net_latency in replay req
2191                          * (see ptlrpc_replay_req) */
2192                         to += 2 * lustre_msg_get_service_time(req->rq_reqmsg);
2193                 }
2194                 extend_recovery_timer(class_exp2obd(req->rq_export), to, true);
2195         }
2196         EXIT;
2197 }
2198
2199 /** Checking routines for recovery */
2200 static int check_for_recovery_ready(struct lu_target *lut)
2201 {
2202         struct obd_device *obd = lut->lut_obd;
2203         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2204
2205         CDEBUG(D_HA, "connected %d stale %d max_recoverable_clients %d"
2206                " abort %d expired %d\n", clnts, obd->obd_stale_clients,
2207                obd->obd_max_recoverable_clients, obd->obd_abort_recovery,
2208                obd->obd_recovery_expired);
2209
2210         if (!obd->obd_abort_recovery && !obd->obd_recovery_expired) {
2211                 LASSERT(clnts <= obd->obd_max_recoverable_clients);
2212                 if (clnts + obd->obd_stale_clients <
2213                     obd->obd_max_recoverable_clients)
2214                         return 0;
2215         }
2216
2217         if (lut->lut_tdtd != NULL) {
2218                 if (!lut->lut_tdtd->tdtd_replay_ready &&
2219                     !obd->obd_abort_recovery) {
2220                         /* Let's extend recovery timer, in case the recovery
2221                          * timer expired, and some clients got evicted */
2222                         extend_recovery_timer(obd, obd->obd_recovery_timeout,
2223                                               true);
2224                         CDEBUG(D_HA, "%s update recovery is not ready, extend recovery %llu\n",
2225                                obd->obd_name, obd->obd_recovery_timeout);
2226                         return 0;
2227                 }
2228         }
2229
2230         return 1;
2231 }
2232
2233 enum {
2234         REQUEST_RECOVERY = 1,
2235         UPDATE_RECOVERY = 2,
2236 };
2237
2238 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2239 {
2240         __u64 transno = 0;
2241
2242         if (!list_empty(&obd->obd_req_replay_queue)) {
2243                 struct ptlrpc_request *req;
2244
2245                 req = list_entry(obd->obd_req_replay_queue.next,
2246                                  struct ptlrpc_request, rq_list);
2247                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2248         }
2249
2250         return transno;
2251 }
2252
2253 static __u64 get_next_transno(struct lu_target *lut, int *type)
2254 {
2255         struct obd_device *obd = lut->lut_obd;
2256         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2257         __u64 transno = 0;
2258         __u64 update_transno;
2259         ENTRY;
2260
2261         transno = get_next_replay_req_transno(obd);
2262         if (type != NULL)
2263                 *type = REQUEST_RECOVERY;
2264
2265         if (tdtd == NULL)
2266                 RETURN(transno);
2267
2268         update_transno = distribute_txn_get_next_transno(tdtd);
2269         if (transno == 0 || (transno >= update_transno &&
2270                              update_transno != 0)) {
2271                 transno = update_transno;
2272                 if (type != NULL)
2273                         *type = UPDATE_RECOVERY;
2274         }
2275
2276         RETURN(transno);
2277 }
2278
2279 /**
2280  * drop duplicate replay request
2281  *
2282  * Because the operation has been replayed by update recovery, the request
2283  * with the same transno will be dropped and also notify the client to send
2284  * next replay request.
2285  *
2286  * \param[in] env       execution environment
2287  * \param[in] obd       failover obd device
2288  * \param[in] req       request to be dropped
2289  */
2290 static void drop_duplicate_replay_req(struct lu_env *env,
2291                                       struct obd_device *obd,
2292                                       struct ptlrpc_request *req)
2293 {
2294         DEBUG_REQ(D_HA, req, "remove t%lld from %s because of duplicate"
2295                   " update records are found.\n",
2296                   lustre_msg_get_transno(req->rq_reqmsg),
2297                   libcfs_nid2str(req->rq_peer.nid));
2298
2299         /* Right now, only for MDS reint operation update replay and
2300          * normal request replay can have the same transno */
2301         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT) {
2302                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2303                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2304                 if (likely(req->rq_export))
2305                         target_committed_to_req(req);
2306                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2307                 target_send_reply(req, req->rq_status, 0);
2308         } else {
2309                 DEBUG_REQ(D_ERROR, req, "wrong opc" "from %s\n",
2310                 libcfs_nid2str(req->rq_peer.nid));
2311         }
2312         target_exp_dequeue_req_replay(req);
2313         target_request_copy_put(req);
2314         obd->obd_replayed_requests++;
2315 }
2316
2317 static void replay_request_or_update(struct lu_env *env,
2318                                      struct lu_target *lut,
2319                                      struct target_recovery_data *trd,
2320                                      struct ptlrpc_thread *thread)
2321 {
2322         struct obd_device *obd = lut->lut_obd;
2323         struct ptlrpc_request *req = NULL;
2324         int                     type;
2325         __u64                   transno;
2326         ENTRY;
2327
2328         CDEBUG(D_HA, "Waiting for transno %lld\n",
2329                obd->obd_next_recovery_transno);
2330
2331         /* Replay all of request and update by transno */
2332         do {
2333                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2334
2335                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2336
2337                 /** It is needed to extend recovery window above
2338                  *  recovery_time_soft. Extending is possible only in the
2339                  *  end of recovery window (see more details in
2340                  *  handle_recovery_req()).
2341                  */
2342                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2343
2344                 if (target_recovery_overseer(lut, check_for_next_transno,
2345                                         exp_req_replay_healthy_or_from_mdt)) {
2346                         abort_req_replay_queue(obd);
2347                         abort_lock_replay_queue(obd);
2348                         goto abort;
2349                 }
2350
2351                 spin_lock(&obd->obd_recovery_task_lock);
2352                 transno = get_next_transno(lut, &type);
2353                 if (type == REQUEST_RECOVERY && transno != 0) {
2354                         /* Drop replay request from client side, if the
2355                          * replay has been executed by update with the
2356                          * same transno */
2357                         req = list_entry(obd->obd_req_replay_queue.next,
2358                                         struct ptlrpc_request, rq_list);
2359
2360                         list_del_init(&req->rq_list);
2361                         obd->obd_requests_queued_for_recovery--;
2362                         spin_unlock(&obd->obd_recovery_task_lock);
2363
2364                         /* Let's check if the request has been redone by
2365                          * update replay */
2366                         if (is_req_replayed_by_update(req)) {
2367                                 struct distribute_txn_replay_req *dtrq;
2368
2369                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2370                                                                    req->rq_xid);
2371                                 LASSERT(dtrq != NULL);
2372                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2373                                 list_del_init(&dtrq->dtrq_list);
2374                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2375                                 dtrq_destroy(dtrq);
2376
2377                                 drop_duplicate_replay_req(env, obd, req);
2378
2379                                 continue;
2380                         }
2381
2382                         LASSERT(trd->trd_processing_task == current_pid());
2383                         DEBUG_REQ(D_HA, req, "processing t%lld from %s",
2384                                   lustre_msg_get_transno(req->rq_reqmsg),
2385                                   libcfs_nid2str(req->rq_peer.nid));
2386
2387                         handle_recovery_req(thread, req,
2388                                             trd->trd_recovery_handler);
2389                         /**
2390                          * bz18031: increase next_recovery_transno before
2391                          * target_request_copy_put() will drop exp_rpc reference
2392                          */
2393                         spin_lock(&obd->obd_recovery_task_lock);
2394                         obd->obd_next_recovery_transno++;
2395                         spin_unlock(&obd->obd_recovery_task_lock);
2396                         target_exp_dequeue_req_replay(req);
2397                         target_request_copy_put(req);
2398                         obd->obd_replayed_requests++;
2399                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2400                         struct distribute_txn_replay_req *dtrq;
2401                         int rc;
2402
2403                         spin_unlock(&obd->obd_recovery_task_lock);
2404
2405                         LASSERT(tdtd != NULL);
2406                         dtrq = distribute_txn_get_next_req(tdtd);
2407                         lu_context_enter(&thread->t_env->le_ctx);
2408                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2409                         lu_context_exit(&thread->t_env->le_ctx);
2410                         extend_recovery_timer(obd, obd_timeout, true);
2411
2412                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2413                                 CDEBUG(D_HA, "Move x%llu t%llu"
2414                                        " to finish list\n", dtrq->dtrq_xid,
2415                                        dtrq->dtrq_master_transno);
2416
2417                                 /* Add it to the replay finish list */
2418                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2419                                 list_add(&dtrq->dtrq_list,
2420                                          &tdtd->tdtd_replay_finish_list);
2421                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2422
2423                                 spin_lock(&obd->obd_recovery_task_lock);
2424                                 if (transno == obd->obd_next_recovery_transno)
2425                                         obd->obd_next_recovery_transno++;
2426                                 else if (transno >
2427                                          obd->obd_next_recovery_transno)
2428                                         obd->obd_next_recovery_transno =
2429                                                                 transno + 1;
2430                                 spin_unlock(&obd->obd_recovery_task_lock);
2431                         } else {
2432                                 dtrq_destroy(dtrq);
2433                         }
2434                 } else {
2435                         spin_unlock(&obd->obd_recovery_task_lock);
2436 abort:
2437                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2438                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2439                         /** evict exports failed VBR */
2440                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2441                         break;
2442                 }
2443         } while (1);
2444 }
2445
2446 static int target_recovery_thread(void *arg)
2447 {
2448         struct lu_target *lut = arg;
2449         struct obd_device *obd = lut->lut_obd;
2450         struct ptlrpc_request *req;
2451         struct target_recovery_data *trd = &obd->obd_recovery_data;
2452         unsigned long delta;
2453         struct lu_env *env;
2454         struct ptlrpc_thread *thread = NULL;
2455         int rc = 0;
2456         ENTRY;
2457
2458         unshare_fs_struct();
2459         OBD_ALLOC_PTR(thread);
2460         if (thread == NULL)
2461                 RETURN(-ENOMEM);
2462
2463         OBD_ALLOC_PTR(env);
2464         if (env == NULL) {
2465                 OBD_FREE_PTR(thread);
2466                 RETURN(-ENOMEM);
2467         }
2468
2469         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2470         if (rc) {
2471                 OBD_FREE_PTR(thread);
2472                 OBD_FREE_PTR(env);
2473                 RETURN(rc);
2474         }
2475
2476         thread->t_env = env;
2477         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2478         env->le_ctx.lc_thread = thread;
2479         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2480         thread->t_watchdog = NULL;
2481
2482         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2483                current_pid());
2484         trd->trd_processing_task = current_pid();
2485
2486         spin_lock(&obd->obd_dev_lock);
2487         obd->obd_recovering = 1;
2488         spin_unlock(&obd->obd_dev_lock);
2489         complete(&trd->trd_starting);
2490
2491         /* first of all, we have to know the first transno to replay */
2492         if (target_recovery_overseer(lut, check_for_recovery_ready,
2493                                      exp_connect_healthy)) {
2494                 abort_req_replay_queue(obd);
2495                 abort_lock_replay_queue(obd);
2496                 if (lut->lut_tdtd != NULL)
2497                         dtrq_list_destroy(lut->lut_tdtd);
2498         }
2499
2500         /* next stage: replay requests or update */
2501         delta = jiffies;
2502         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2503                atomic_read(&obd->obd_req_replay_clients),
2504                obd->obd_next_recovery_transno);
2505         replay_request_or_update(env, lut, trd, thread);
2506
2507         /**
2508          * The second stage: replay locks
2509          */
2510         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2511                atomic_read(&obd->obd_lock_replay_clients));
2512         while ((req = target_next_replay_lock(lut))) {
2513                 LASSERT(trd->trd_processing_task == current_pid());
2514                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
2515                           libcfs_nid2str(req->rq_peer.nid));
2516                 handle_recovery_req(thread, req,
2517                                     trd->trd_recovery_handler);
2518                 target_request_copy_put(req);
2519                 obd->obd_replayed_locks++;
2520         }
2521
2522         /**
2523          * The third stage: reply on final pings, at this moment all clients
2524          * must have request in final queue
2525          */
2526         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2527         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2528         /** Update server last boot epoch */
2529         tgt_boot_epoch_update(lut);
2530         /* We drop recoverying flag to forward all new requests
2531          * to regular mds_handle() since now */
2532         spin_lock(&obd->obd_dev_lock);
2533         obd->obd_recovering = obd->obd_abort_recovery = 0;
2534         spin_unlock(&obd->obd_dev_lock);
2535         spin_lock(&obd->obd_recovery_task_lock);
2536         target_cancel_recovery_timer(obd);
2537         spin_unlock(&obd->obd_recovery_task_lock);
2538         while ((req = target_next_final_ping(obd))) {
2539                 LASSERT(trd->trd_processing_task == current_pid());
2540                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
2541                           libcfs_nid2str(req->rq_peer.nid));
2542                 handle_recovery_req(thread, req,
2543                                     trd->trd_recovery_handler);
2544                 /* Because the waiting client can not send ping to server,
2545                  * so we need refresh the last_request_time, to avoid the
2546                  * export is being evicted */
2547                 ptlrpc_update_export_timer(req->rq_export, 0);
2548                 target_request_copy_put(req);
2549         }
2550
2551         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2552         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
2553               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2554         if (delta > OBD_RECOVERY_TIME_SOFT) {
2555                 CWARN("too long recovery - read logs\n");
2556                 libcfs_debug_dumplog();
2557         }
2558
2559         target_finish_recovery(lut);
2560
2561         lu_context_fini(&env->le_ctx);
2562         trd->trd_processing_task = 0;
2563         complete(&trd->trd_finishing);
2564
2565         tgt_io_thread_done(thread);
2566         OBD_FREE_PTR(thread);
2567         OBD_FREE_PTR(env);
2568         RETURN(rc);
2569 }
2570
2571 static int target_start_recovery_thread(struct lu_target *lut,
2572                                         svc_handler_t handler)
2573 {
2574         struct obd_device *obd = lut->lut_obd;
2575         int rc = 0;
2576         struct target_recovery_data *trd = &obd->obd_recovery_data;
2577         int index;
2578
2579         memset(trd, 0, sizeof(*trd));
2580         init_completion(&trd->trd_starting);
2581         init_completion(&trd->trd_finishing);
2582         trd->trd_recovery_handler = handler;
2583
2584         rc = server_name2index(obd->obd_name, &index, NULL);
2585         if (rc < 0)
2586                 return rc;
2587
2588         if (!IS_ERR(kthread_run(target_recovery_thread,
2589                                 lut, "tgt_recover_%d", index))) {
2590                 wait_for_completion(&trd->trd_starting);
2591                 LASSERT(obd->obd_recovering != 0);
2592         } else {
2593                 rc = -ECHILD;
2594         }
2595
2596         return rc;
2597 }
2598
2599 void target_stop_recovery_thread(struct obd_device *obd)
2600 {
2601         if (obd->obd_recovery_data.trd_processing_task > 0) {
2602                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2603                 /** recovery can be done but postrecovery is not yet */
2604                 spin_lock(&obd->obd_dev_lock);
2605                 if (obd->obd_recovering) {
2606                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2607                         obd->obd_abort_recovery = 1;
2608                         wake_up(&obd->obd_next_transno_waitq);
2609                 }
2610                 spin_unlock(&obd->obd_dev_lock);
2611                 wait_for_completion(&trd->trd_finishing);
2612         }
2613 }
2614 EXPORT_SYMBOL(target_stop_recovery_thread);
2615
2616 void target_recovery_fini(struct obd_device *obd)
2617 {
2618         class_disconnect_exports(obd);
2619         target_stop_recovery_thread(obd);
2620         target_cleanup_recovery(obd);
2621 }
2622 EXPORT_SYMBOL(target_recovery_fini);
2623
2624 static void target_recovery_expired(unsigned long castmeharder)
2625 {
2626         struct obd_device *obd = (struct obd_device *)castmeharder;
2627         CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
2628                " after %llus (%d clients connected)\n",
2629                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2630                (s64)(ktime_get_real_seconds() - obd->obd_recovery_start),
2631                atomic_read(&obd->obd_connected_clients));
2632
2633         obd->obd_recovery_expired = 1;
2634         wake_up(&obd->obd_next_transno_waitq);
2635 }
2636
2637 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2638 {
2639         struct obd_device *obd = lut->lut_obd;
2640
2641         if (lut->lut_bottom->dd_rdonly)
2642                 return;
2643
2644         if (obd->obd_max_recoverable_clients == 0) {
2645                 /** Update server last boot epoch */
2646                 tgt_boot_epoch_update(lut);
2647                 return;
2648         }
2649
2650         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2651                "last_transno %llu\n", obd->obd_name,
2652                obd->obd_max_recoverable_clients, obd->obd_last_committed);
2653         LASSERT(obd->obd_stopping == 0);
2654         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2655         obd->obd_recovery_start = 0;
2656         obd->obd_recovery_end = 0;
2657
2658         setup_timer(&obd->obd_recovery_timer, target_recovery_expired,
2659                     (unsigned long)obd);
2660         target_start_recovery_thread(lut, handler);
2661 }
2662 EXPORT_SYMBOL(target_recovery_init);
2663
2664 static int target_process_req_flags(struct obd_device *obd,
2665                                     struct ptlrpc_request *req)
2666 {
2667         struct obd_export *exp = req->rq_export;
2668         LASSERT(exp != NULL);
2669         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2670                 /* client declares he's ready to replay locks */
2671                 spin_lock(&exp->exp_lock);
2672                 if (exp->exp_req_replay_needed) {
2673                         exp->exp_req_replay_needed = 0;
2674                         spin_unlock(&exp->exp_lock);
2675
2676                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2677                         atomic_dec(&obd->obd_req_replay_clients);
2678                 } else {
2679                         spin_unlock(&exp->exp_lock);
2680                 }
2681         }
2682         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2683                 /* client declares he's ready to complete recovery
2684                  * so, we put the request on th final queue */
2685                 spin_lock(&exp->exp_lock);
2686                 if (exp->exp_lock_replay_needed) {
2687                         exp->exp_lock_replay_needed = 0;
2688                         spin_unlock(&exp->exp_lock);
2689
2690                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
2691                         atomic_dec(&obd->obd_lock_replay_clients);
2692                 } else {
2693                         spin_unlock(&exp->exp_lock);
2694                 }
2695         }
2696         return 0;
2697 }
2698
2699 int target_queue_recovery_request(struct ptlrpc_request *req,
2700                                   struct obd_device *obd)
2701 {
2702         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
2703         struct ptlrpc_request *reqiter;
2704         int inserted = 0;
2705         ENTRY;
2706
2707         if (obd->obd_recovery_data.trd_processing_task == current_pid()) {
2708                 /* Processing the queue right now, don't re-add. */
2709                 RETURN(1);
2710         }
2711
2712         target_process_req_flags(obd, req);
2713
2714         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2715                 /* client declares he's ready to complete recovery
2716                  * so, we put the request on th final queue */
2717                 target_request_copy_get(req);
2718                 DEBUG_REQ(D_HA, req, "queue final req");
2719                 wake_up(&obd->obd_next_transno_waitq);
2720                 spin_lock(&obd->obd_recovery_task_lock);
2721                 if (obd->obd_recovering) {
2722                         struct ptlrpc_request *tmp;
2723                         struct ptlrpc_request *duplicate = NULL;
2724
2725                         if (likely(!req->rq_export->exp_replay_done)) {
2726                                 req->rq_export->exp_replay_done = 1;
2727                                 list_add_tail(&req->rq_list,
2728                                               &obd->obd_final_req_queue);
2729                                 spin_unlock(&obd->obd_recovery_task_lock);
2730                                 RETURN(0);
2731                         }
2732
2733                         /* XXX O(n), but only happens if final ping is
2734                          * timed out, probably reorganize the list as
2735                          * a hash list later */
2736                         list_for_each_entry_safe(reqiter, tmp,
2737                                                  &obd->obd_final_req_queue,
2738                                                  rq_list) {
2739                                 if (reqiter->rq_export == req->rq_export) {
2740                                         list_del_init(&reqiter->rq_list);
2741                                         duplicate = reqiter;
2742                                         break;
2743                                 }
2744                         }
2745
2746                         list_add_tail(&req->rq_list,
2747                                       &obd->obd_final_req_queue);
2748                         req->rq_export->exp_replay_done = 1;
2749                         spin_unlock(&obd->obd_recovery_task_lock);
2750
2751                         if (duplicate != NULL) {
2752                                 DEBUG_REQ(D_HA, duplicate,
2753                                           "put prev final req\n");
2754                                 target_request_copy_put(duplicate);
2755                         }
2756                         RETURN(0);
2757                 } else {
2758                         spin_unlock(&obd->obd_recovery_task_lock);
2759                         target_request_copy_put(req);
2760                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
2761                 }
2762         }
2763         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2764                 /* client declares he's ready to replay locks */
2765                 target_request_copy_get(req);
2766                 DEBUG_REQ(D_HA, req, "queue lock replay req");
2767                 wake_up(&obd->obd_next_transno_waitq);
2768                 spin_lock(&obd->obd_recovery_task_lock);
2769                 LASSERT(obd->obd_recovering);
2770                 /* usually due to recovery abort */
2771                 if (!req->rq_export->exp_in_recovery) {
2772                         spin_unlock(&obd->obd_recovery_task_lock);
2773                         target_request_copy_put(req);
2774                         RETURN(-ENOTCONN);
2775                 }
2776                 LASSERT(req->rq_export->exp_lock_replay_needed);
2777                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
2778                 spin_unlock(&obd->obd_recovery_task_lock);
2779                 RETURN(0);
2780         }
2781
2782         /* CAVEAT EMPTOR: The incoming request message has been swabbed
2783          * (i.e. buflens etc are in my own byte order), but type-dependent
2784          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed. */
2785
2786         if (!transno) {
2787                 INIT_LIST_HEAD(&req->rq_list);
2788                 DEBUG_REQ(D_HA, req, "not queueing");
2789                 RETURN(1);
2790         }
2791
2792         /* If we're processing the queue, we want don't want to queue this
2793          * message.
2794          *
2795          * Also, if this request has a transno less than the one we're waiting
2796          * for, we should process it now.  It could (and currently always will)
2797          * be an open request for a descriptor that was opened some time ago.
2798          *
2799          * Also, a resent, replayed request that has already been
2800          * handled will pass through here and be processed immediately.
2801          */
2802         CDEBUG(D_HA, "Next recovery transno: %llu"
2803                ", current: %llu, replaying\n",
2804                obd->obd_next_recovery_transno, transno);
2805
2806         /* If the request has been replayed by update replay, then sends this
2807          * request to the recovery thread (replay_request_or_update()), where
2808          * it will be handled */
2809         spin_lock(&obd->obd_recovery_task_lock);
2810         if (transno < obd->obd_next_recovery_transno &&
2811             !is_req_replayed_by_update(req)) {
2812                 /* Processing the queue right now, don't re-add. */
2813                 LASSERT(list_empty(&req->rq_list));
2814                 spin_unlock(&obd->obd_recovery_task_lock);
2815                 RETURN(1);
2816         }
2817         spin_unlock(&obd->obd_recovery_task_lock);
2818
2819         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2820                 RETURN(0);
2821
2822         target_request_copy_get(req);
2823         if (!req->rq_export->exp_in_recovery) {
2824                 target_request_copy_put(req);
2825                 RETURN(-ENOTCONN);
2826         }
2827         LASSERT(req->rq_export->exp_req_replay_needed);
2828
2829         if (target_exp_enqueue_req_replay(req)) {
2830                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2831                 target_request_copy_put(req);
2832                 RETURN(0);
2833         }
2834
2835         /* XXX O(n^2) */
2836         spin_lock(&obd->obd_recovery_task_lock);
2837         LASSERT(obd->obd_recovering);
2838         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
2839                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2840                         list_add_tail(&req->rq_list, &reqiter->rq_list);
2841                         inserted = 1;
2842                         goto added;
2843                 }
2844
2845                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2846                              transno)) {
2847                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2848                                   "has been claimed by another client");
2849                         spin_unlock(&obd->obd_recovery_task_lock);
2850                         target_exp_dequeue_req_replay(req);
2851                         target_request_copy_put(req);
2852                         RETURN(0);
2853                 }
2854         }
2855 added:
2856         if (!inserted)
2857                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2858
2859         obd->obd_requests_queued_for_recovery++;
2860         spin_unlock(&obd->obd_recovery_task_lock);
2861         wake_up(&obd->obd_next_transno_waitq);
2862         RETURN(0);
2863 }
2864
2865 int target_handle_ping(struct ptlrpc_request *req)
2866 {
2867         obd_ping(req->rq_svc_thread->t_env, req->rq_export);
2868         return req_capsule_server_pack(&req->rq_pill);
2869 }
2870
2871 void target_committed_to_req(struct ptlrpc_request *req)
2872 {
2873         struct obd_export *exp = req->rq_export;
2874
2875         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2876                 lustre_msg_set_last_committed(req->rq_repmsg,
2877                                               exp->exp_last_committed);
2878         else
2879                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2880                           "%d)", exp->exp_obd->obd_no_transno,
2881                           req->rq_repmsg == NULL);
2882
2883         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
2884                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2885 }
2886
2887 #endif /* HAVE_SERVER_SUPPORT */
2888
2889 /**
2890  * Packs current SLV and Limit into \a req.
2891  */
2892 int target_pack_pool_reply(struct ptlrpc_request *req)
2893 {
2894         struct obd_device *obd;
2895         ENTRY;
2896
2897         /* Check that we still have all structures alive as this may
2898          * be some late RPC at shutdown time. */
2899         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2900                      !exp_connect_lru_resize(req->rq_export))) {
2901                 lustre_msg_set_slv(req->rq_repmsg, 0);
2902                 lustre_msg_set_limit(req->rq_repmsg, 0);
2903                 RETURN(0);
2904         }
2905
2906         /* OBD is alive here as export is alive, which we checked above. */
2907         obd = req->rq_export->exp_obd;
2908
2909         read_lock(&obd->obd_pool_lock);
2910         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2911         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2912         read_unlock(&obd->obd_pool_lock);
2913
2914         RETURN(0);
2915 }
2916
2917 static int target_send_reply_msg(struct ptlrpc_request *req,
2918                                  int rc, int fail_id)
2919 {
2920         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2921                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2922                 return -ECOMM;
2923         }
2924         /* We can have a null rq_reqmsg in the event of bad signature or
2925          * no context when unwrapping */
2926         if (req->rq_reqmsg &&
2927             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
2928             OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
2929                 return -ECOMM;
2930
2931         if (unlikely(rc)) {
2932                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
2933                 req->rq_status = rc;
2934                 return ptlrpc_send_error(req, 1);
2935         } else {
2936                 DEBUG_REQ(D_NET, req, "sending reply");
2937         }
2938
2939         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
2940 }
2941
2942 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2943 {
2944         struct ptlrpc_service_part *svcpt;
2945         int                        netrc;
2946         struct ptlrpc_reply_state *rs;
2947         struct obd_export         *exp;
2948         ENTRY;
2949
2950         if (req->rq_no_reply) {
2951                 EXIT;
2952                 return;
2953         }
2954
2955         svcpt = req->rq_rqbd->rqbd_svcpt;
2956         rs = req->rq_reply_state;
2957         if (rs == NULL || !rs->rs_difficult) {
2958                 /* no notifiers */
2959                 target_send_reply_msg (req, rc, fail_id);
2960                 EXIT;
2961                 return;
2962         }
2963
2964         /* must be an export if locks saved */
2965         LASSERT(req->rq_export != NULL);
2966         /* req/reply consistent */
2967         LASSERT(rs->rs_svcpt == svcpt);
2968
2969         /* "fresh" reply */
2970         LASSERT(!rs->rs_scheduled);
2971         LASSERT(!rs->rs_scheduled_ever);
2972         LASSERT(!rs->rs_handled);
2973         LASSERT(!rs->rs_on_net);
2974         LASSERT(rs->rs_export == NULL);
2975         LASSERT(list_empty(&rs->rs_obd_list));
2976         LASSERT(list_empty(&rs->rs_exp_list));
2977
2978         exp = class_export_get(req->rq_export);
2979
2980         /* disable reply scheduling while I'm setting up */
2981         rs->rs_scheduled = 1;
2982         rs->rs_on_net    = 1;
2983         rs->rs_xid       = req->rq_xid;
2984         rs->rs_transno   = req->rq_transno;
2985         rs->rs_export    = exp;
2986         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
2987
2988         spin_lock(&exp->exp_uncommitted_replies_lock);
2989         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
2990                rs->rs_transno, exp->exp_last_committed);
2991         if (rs->rs_transno > exp->exp_last_committed) {
2992                 /* not committed already */
2993                 list_add_tail(&rs->rs_obd_list,
2994                                   &exp->exp_uncommitted_replies);
2995         }
2996         spin_unlock(&exp->exp_uncommitted_replies_lock);
2997
2998         spin_lock(&exp->exp_lock);
2999         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
3000         spin_unlock(&exp->exp_lock);
3001
3002         netrc = target_send_reply_msg(req, rc, fail_id);
3003
3004         spin_lock(&svcpt->scp_rep_lock);
3005
3006         atomic_inc(&svcpt->scp_nreps_difficult);
3007
3008         if (netrc != 0) {
3009                 /* error sending: reply is off the net.  Also we need +1
3010                  * reply ref until ptlrpc_handle_rs() is done
3011                  * with the reply state (if the send was successful, there
3012                  * would have been +1 ref for the net, which
3013                  * reply_out_callback leaves alone) */
3014                 rs->rs_on_net = 0;
3015                 ptlrpc_rs_addref(rs);
3016         }
3017
3018         spin_lock(&rs->rs_lock);
3019         if (rs->rs_transno <= exp->exp_last_committed ||
3020             (!rs->rs_on_net && !rs->rs_no_ack) ||
3021             list_empty(&rs->rs_exp_list) ||     /* completed already */
3022             list_empty(&rs->rs_obd_list)) {
3023                 CDEBUG(D_HA, "Schedule reply immediately\n");
3024                 ptlrpc_dispatch_difficult_reply(rs);
3025         } else {
3026                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
3027                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
3028         }
3029         spin_unlock(&rs->rs_lock);
3030         spin_unlock(&svcpt->scp_rep_lock);
3031         EXIT;
3032 }
3033
3034 enum ldlm_mode lck_compat_array[] = {
3035         [LCK_EX]    = LCK_COMPAT_EX,
3036         [LCK_PW]    = LCK_COMPAT_PW,
3037         [LCK_PR]    = LCK_COMPAT_PR,
3038         [LCK_CW]    = LCK_COMPAT_CW,
3039         [LCK_CR]    = LCK_COMPAT_CR,
3040         [LCK_NL]    = LCK_COMPAT_NL,
3041         [LCK_GROUP] = LCK_COMPAT_GROUP,
3042         [LCK_COS]   = LCK_COMPAT_COS,
3043 };
3044
3045 /**
3046  * Rather arbitrary mapping from LDLM error codes to errno values. This should
3047  * not escape to the user level.
3048  */
3049 int ldlm_error2errno(enum ldlm_error error)
3050 {
3051         int result;
3052
3053         switch (error) {
3054         case ELDLM_OK:
3055         case ELDLM_LOCK_MATCHED:
3056                 result = 0;
3057                 break;
3058         case ELDLM_LOCK_CHANGED:
3059                 result = -ESTALE;
3060                 break;
3061         case ELDLM_LOCK_ABORTED:
3062                 result = -ENAVAIL;
3063                 break;
3064         case ELDLM_LOCK_REPLACED:
3065                 result = -ESRCH;
3066                 break;
3067         case ELDLM_NO_LOCK_DATA:
3068                 result = -ENOENT;
3069                 break;
3070         case ELDLM_NAMESPACE_EXISTS:
3071                 result = -EEXIST;
3072                 break;
3073         case ELDLM_BAD_NAMESPACE:
3074                 result = -EBADF;
3075                 break;
3076         default:
3077                 if (((int)error) < 0) { /* cast to signed type */
3078                         result = error; /* as ldlm_error can be unsigned */
3079                 } else {
3080                         CERROR("Invalid DLM result code: %d\n", error);
3081                         result = -EPROTO;
3082                 }
3083         }
3084         return result;
3085 }
3086 EXPORT_SYMBOL(ldlm_error2errno);
3087
3088 /**
3089  * Dual to ldlm_error2errno(): maps errno values back to enum ldlm_error.
3090  */
3091 enum ldlm_error ldlm_errno2error(int err_no)
3092 {
3093         int error;
3094
3095         switch (err_no) {
3096         case 0:
3097                 error = ELDLM_OK;
3098                 break;
3099         case -ESTALE:
3100                 error = ELDLM_LOCK_CHANGED;
3101                 break;
3102         case -ENAVAIL:
3103                 error = ELDLM_LOCK_ABORTED;
3104                 break;
3105         case -ESRCH:
3106                 error = ELDLM_LOCK_REPLACED;
3107                 break;
3108         case -ENOENT:
3109                 error = ELDLM_NO_LOCK_DATA;
3110                 break;
3111         case -EEXIST:
3112                 error = ELDLM_NAMESPACE_EXISTS;
3113                 break;
3114         case -EBADF:
3115                 error = ELDLM_BAD_NAMESPACE;
3116                 break;
3117         default:
3118                 error = err_no;
3119         }
3120         return error;
3121 }
3122
3123 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3124 void ldlm_dump_export_locks(struct obd_export *exp)
3125 {
3126         spin_lock(&exp->exp_locks_list_guard);
3127         if (!list_empty(&exp->exp_locks_list)) {
3128                 struct ldlm_lock *lock;
3129
3130                 CERROR("dumping locks for export %p,"
3131                        "ignore if the unmount doesn't hang\n", exp);
3132                 list_for_each_entry(lock, &exp->exp_locks_list,
3133                                         l_exp_refs_link)
3134                         LDLM_ERROR(lock, "lock:");
3135         }
3136         spin_unlock(&exp->exp_locks_list_guard);
3137 }
3138 #endif
3139
3140 #ifdef HAVE_SERVER_SUPPORT
3141 static int target_bulk_timeout(void *data)
3142 {
3143         ENTRY;
3144         /* We don't fail the connection here, because having the export
3145          * killed makes the (vital) call to commitrw very sad.
3146          */
3147         RETURN(1);
3148 }
3149
3150 static inline const char *bulk2type(struct ptlrpc_request *req)
3151 {
3152         if (req->rq_bulk_read)
3153                 return "READ";
3154         if (req->rq_bulk_write)
3155                 return "WRITE";
3156         return "UNKNOWN";
3157 }
3158
3159 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc,
3160                    struct l_wait_info *lwi)
3161 {
3162         struct ptlrpc_request   *req = desc->bd_req;
3163         time_t                   start = cfs_time_current_sec();
3164         time_t                   deadline;
3165         int                      rc = 0;
3166
3167         ENTRY;
3168
3169         /* If there is eviction in progress, wait for it to finish. */
3170         if (unlikely(atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
3171                 *lwi = LWI_INTR(NULL, NULL);
3172                 rc = l_wait_event(exp->exp_obd->obd_evict_inprogress_waitq,
3173                                   !atomic_read(&exp->exp_obd->
3174                                                    obd_evict_inprogress),
3175                                   lwi);
3176         }
3177
3178         /* Check if client was evicted or reconnected already. */
3179         if (exp->exp_failed ||
3180             exp->exp_conn_cnt > lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3181                 rc = -ENOTCONN;
3182         } else {
3183                 if (req->rq_bulk_read)
3184                         rc = sptlrpc_svc_wrap_bulk(req, desc);
3185
3186                 if (OCD_HAS_FLAG(&exp->exp_connect_data, BULK_MBITS))
3187                         req->rq_mbits = lustre_msg_get_mbits(req->rq_reqmsg);
3188                 else /* old version, bulk matchbits is rq_xid */
3189                         req->rq_mbits = req->rq_xid;
3190
3191                 if (rc == 0)
3192                         rc = ptlrpc_start_bulk_transfer(desc);
3193         }
3194
3195         if (rc < 0) {
3196                 DEBUG_REQ(D_ERROR, req, "bulk %s failed: rc %d",
3197                           bulk2type(req), rc);
3198                 RETURN(rc);
3199         }
3200
3201         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
3202                 ptlrpc_abort_bulk(desc);
3203                 RETURN(0);
3204         }
3205
3206         /* limit actual bulk transfer to bulk_timeout seconds */
3207         deadline = start + bulk_timeout;
3208         if (deadline > req->rq_deadline)
3209                 deadline = req->rq_deadline;
3210
3211         do {
3212                 long timeoutl = deadline - cfs_time_current_sec();
3213                 cfs_duration_t timeout = timeoutl <= 0 ?
3214                                          CFS_TICK : cfs_time_seconds(timeoutl);
3215                 time_t  rq_deadline;
3216
3217                 *lwi = LWI_TIMEOUT_INTERVAL(timeout, cfs_time_seconds(1),
3218                                             target_bulk_timeout, desc);
3219                 rc = l_wait_event(desc->bd_waitq,
3220                                   !ptlrpc_server_bulk_active(desc) ||
3221                                   exp->exp_failed ||
3222                                   exp->exp_conn_cnt >
3223                                   lustre_msg_get_conn_cnt(req->rq_reqmsg),
3224                                   lwi);
3225                 LASSERT(rc == 0 || rc == -ETIMEDOUT);
3226                 /* Wait again if we changed rq_deadline. */
3227                 rq_deadline = ACCESS_ONCE(req->rq_deadline);
3228                 deadline = start + bulk_timeout;
3229                 if (deadline > rq_deadline)
3230                         deadline = rq_deadline;
3231         } while ((rc == -ETIMEDOUT) &&
3232                  (deadline > cfs_time_current_sec()));
3233
3234         if (rc == -ETIMEDOUT) {
3235                 DEBUG_REQ(D_ERROR, req, "timeout on bulk %s after %ld%+lds",
3236                           bulk2type(req), deadline - start,
3237                           cfs_time_current_sec() - deadline);
3238                 ptlrpc_abort_bulk(desc);
3239         } else if (exp->exp_failed) {
3240                 DEBUG_REQ(D_ERROR, req, "Eviction on bulk %s",
3241                           bulk2type(req));
3242                 rc = -ENOTCONN;
3243                 ptlrpc_abort_bulk(desc);
3244         } else if (exp->exp_conn_cnt >
3245                    lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3246                 DEBUG_REQ(D_ERROR, req, "Reconnect on bulk %s",
3247                           bulk2type(req));
3248                 /* We don't reply anyway. */
3249                 rc = -ETIMEDOUT;
3250                 ptlrpc_abort_bulk(desc);
3251         } else if (desc->bd_failure) {
3252                 DEBUG_REQ(D_ERROR, req, "network error on bulk %s",
3253                           bulk2type(req));
3254                 /* XXX should this be a different errno? */
3255                 rc = -ETIMEDOUT;
3256         } else {
3257                 if (req->rq_bulk_write)
3258                         rc = sptlrpc_svc_unwrap_bulk(req, desc);
3259                 if (rc == 0 && desc->bd_nob_transferred != desc->bd_nob) {
3260                         DEBUG_REQ(D_ERROR, req, "truncated bulk %s %d(%d)",
3261                                   bulk2type(req), desc->bd_nob_transferred,
3262                                   desc->bd_nob);
3263                         /* XXX should this be a different errno? */
3264                         rc = -ETIMEDOUT;
3265                 }
3266         }
3267
3268         RETURN(rc);
3269 }
3270 EXPORT_SYMBOL(target_bulk_io);
3271
3272 #endif /* HAVE_SERVER_SUPPORT */