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