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, 2017, 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/jiffies.h>
  43 #include <linux/kthread.h>
  44 #include <libcfs/libcfs.h>
  45 #include <obd.h>
  46 #include <obd_class.h>
  47 #include <lustre_dlm.h>
  48 #include <lustre_net.h>
  49 #include <lustre_sec.h>
  50 #include "ldlm_internal.h"
  51
  52 /* @priority: If non-zero, move the selected connection to the list head.
  53  * @create: If zero, only search in existing connections.
  54  */
  55 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  56                            int priority, int create)
  57 {
  58         struct ptlrpc_connection *ptlrpc_conn;
  59         struct obd_import_conn *imp_conn = NULL, *item;
  60         lnet_nid_t nid4refnet = LNET_NID_ANY;
  61         int rc = 0;
  62         ENTRY;
  63
  64         if (!create && !priority) {
  65                 CDEBUG(D_HA, "Nothing to do\n");
  66                 RETURN(-EINVAL);
  67         }
  68
  69         if (imp->imp_connection &&
  70             imp->imp_connection->c_remote_uuid.uuid[0] == 0)
  71                 /* nid4refnet is used to restrict network connections */
  72                 nid4refnet = imp->imp_connection->c_self;
  73         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, nid4refnet);
  74         if (!ptlrpc_conn) {
  75                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  76                 RETURN(-ENOENT);
  77         }
  78
  79         if (create) {
  80                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  81                 if (!imp_conn)
  82                         GOTO(out_put, rc = -ENOMEM);
  83         }
  84
  85         spin_lock(&imp->imp_lock);
  86         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  87                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  88                         if (priority) {
  89                                 list_del(&item->oic_item);
  90                                 list_add(&item->oic_item,
  91                                          &imp->imp_conn_list);
  92                                 item->oic_last_attempt = 0;
  93                         }
  94                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  95                                imp, imp->imp_obd->obd_name, uuid->uuid,
  96                                (priority ? ", moved to head" : ""));
  97                         spin_unlock(&imp->imp_lock);
  98                         GOTO(out_free, rc = 0);
  99                 }
 100         }
 101         /* No existing import connection found for \a uuid. */
 102         if (create) {
 103                 imp_conn->oic_conn = ptlrpc_conn;
 104                 imp_conn->oic_uuid = *uuid;
 105                 imp_conn->oic_last_attempt = 0;
 106                 if (priority)
 107                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 108                 else
 109                         list_add_tail(&imp_conn->oic_item,
 110                                       &imp->imp_conn_list);
 111                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 112                        imp, imp->imp_obd->obd_name, uuid->uuid,
 113                        (priority ? "head" : "tail"));
 114         } else {
 115                 spin_unlock(&imp->imp_lock);
 116                 GOTO(out_free, rc = -ENOENT);
 117         }
 118
 119         spin_unlock(&imp->imp_lock);
 120         RETURN(0);
 121 out_free:
 122         if (imp_conn)
 123                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 124 out_put:
 125         ptlrpc_connection_put(ptlrpc_conn);
 126         RETURN(rc);
 127 }
 128
 129 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 130 {
 131         return import_set_conn(imp, uuid, 1, 0);
 132 }
 133
 134 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 135                            int priority)
 136 {
 137         return import_set_conn(imp, uuid, priority, 1);
 138 }
 139 EXPORT_SYMBOL(client_import_add_conn);
 140
 141 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 142 {
 143         struct obd_import_conn *imp_conn;
 144         struct obd_export *dlmexp;
 145         int rc = -ENOENT;
 146         ENTRY;
 147
 148         spin_lock(&imp->imp_lock);
 149         if (list_empty(&imp->imp_conn_list)) {
 150                 LASSERT(!imp->imp_connection);
 151                 GOTO(out, rc);
 152         }
 153
 154         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 155                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 156                         continue;
 157                 LASSERT(imp_conn->oic_conn);
 158
 159                 if (imp_conn == imp->imp_conn_current) {
 160                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 161
 162                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 163                             imp->imp_state != LUSTRE_IMP_DISCON) {
 164                                 CERROR("can't remove current connection\n");
 165                                 GOTO(out, rc = -EBUSY);
 166                         }
 167
 168                         ptlrpc_connection_put(imp->imp_connection);
 169                         imp->imp_connection = NULL;
 170
 171                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 172                         if (dlmexp && dlmexp->exp_connection) {
 173                                 LASSERT(dlmexp->exp_connection ==
 174                                         imp_conn->oic_conn);
 175                                 ptlrpc_connection_put(dlmexp->exp_connection);
 176                                 dlmexp->exp_connection = NULL;
 177                         }
 178
 179                         if (dlmexp != NULL)
 180                                 class_export_put(dlmexp);
 181                 }
 182
 183                 list_del(&imp_conn->oic_item);
 184                 ptlrpc_connection_put(imp_conn->oic_conn);
 185                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 186                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 187                        imp, imp->imp_obd->obd_name, uuid->uuid);
 188                 rc = 0;
 189                 break;
 190         }
 191 out:
 192         spin_unlock(&imp->imp_lock);
 193         if (rc == -ENOENT)
 194                 CERROR("connection %s not found\n", uuid->uuid);
 195         RETURN(rc);
 196 }
 197 EXPORT_SYMBOL(client_import_del_conn);
 198
 199 /**
 200  * Find conn UUID by peer NID. \a peer is a server NID. This function is used
 201  * to find a conn uuid of \a imp which can reach \a peer.
 202  */
 203 int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
 204                             struct obd_uuid *uuid)
 205 {
 206         struct obd_import_conn *conn;
 207         int rc = -ENOENT;
 208         ENTRY;
 209
 210         spin_lock(&imp->imp_lock);
 211         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 212                 /* Check if conn UUID does have this peer NID. */
 213                 if (class_check_uuid(&conn->oic_uuid, peer)) {
 214                         *uuid = conn->oic_uuid;
 215                         rc = 0;
 216                         break;
 217                 }
 218         }
 219         spin_unlock(&imp->imp_lock);
 220         RETURN(rc);
 221 }
 222 EXPORT_SYMBOL(client_import_find_conn);
 223
 224 void client_destroy_import(struct obd_import *imp)
 225 {
 226         /* Drop security policy instance after all RPCs have finished/aborted
 227          * to let all busy contexts be released. */
 228         class_import_get(imp);
 229         class_destroy_import(imp);
 230         sptlrpc_import_sec_put(imp);
 231         class_import_put(imp);
 232 }
 233 EXPORT_SYMBOL(client_destroy_import);
 234
 235 /**
 236  * Check whether or not the OSC is on MDT.
 237  * In the config log,
 238  * osc on MDT
 239  *      setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
 240  * osc on client
 241  *      setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
 242  *
 243  **/
 244 static int osc_on_mdt(char *obdname)
 245 {
 246         char *ptr;
 247
 248         ptr = strrchr(obdname, '-');
 249         if (ptr == NULL)
 250                 return 0;
 251
 252         if (strncmp(ptr + 1, "MDT", 3) == 0)
 253                 return 1;
 254
 255         return 0;
 256 }
 257
 258 /* Configure an RPC client OBD device.
 259  *
 260  * lcfg parameters:
 261  * 1 - client UUID
 262  * 2 - server UUID
 263  * 3 - inactive-on-startup
 264  * 4 - restrictive net
 265  */
 266 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 267 {
 268         struct client_obd *cli = &obddev->u.cli;
 269         struct obd_import *imp;
 270         struct obd_uuid server_uuid;
 271         int rq_portal, rp_portal, connect_op;
 272         char *name = obddev->obd_type->typ_name;
 273         enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
 274         char *cli_name = lustre_cfg_buf(lcfg, 0);
 275         struct ptlrpc_connection fake_conn = { .c_self = 0,
 276                                                .c_remote_uuid.uuid[0] = 0 };
 277         int rc;
 278         ENTRY;
 279
 280         /* In a more perfect world, we would hang a ptlrpc_client off of
 281          * obd_type and just use the values from there. */
 282         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 283                 rq_portal = OST_REQUEST_PORTAL;
 284                 rp_portal = OSC_REPLY_PORTAL;
 285                 connect_op = OST_CONNECT;
 286                 cli->cl_sp_me = LUSTRE_SP_CLI;
 287                 cli->cl_sp_to = LUSTRE_SP_OST;
 288                 ns_type = LDLM_NS_TYPE_OSC;
 289         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
 290                    !strcmp(name, LUSTRE_LWP_NAME)) {
 291                 rq_portal = MDS_REQUEST_PORTAL;
 292                 rp_portal = MDC_REPLY_PORTAL;
 293                 connect_op = MDS_CONNECT;
 294                 if (is_lwp_on_ost(cli_name))
 295                         cli->cl_sp_me = LUSTRE_SP_OST;
 296                 else if (is_lwp_on_mdt(cli_name))
 297                         cli->cl_sp_me = LUSTRE_SP_MDT;
 298                 else
 299                         cli->cl_sp_me = LUSTRE_SP_CLI;
 300                 cli->cl_sp_to = LUSTRE_SP_MDT;
 301                 ns_type = LDLM_NS_TYPE_MDC;
 302         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
 303                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
 304                         /* OSP_on_MDT for other MDTs */
 305                         connect_op = MDS_CONNECT;
 306                         cli->cl_sp_to = LUSTRE_SP_MDT;
 307                         ns_type = LDLM_NS_TYPE_MDC;
 308                         rq_portal = OUT_PORTAL;
 309                 } else {
 310                         /* OSP on MDT for OST */
 311                         connect_op = OST_CONNECT;
 312                         cli->cl_sp_to = LUSTRE_SP_OST;
 313                         ns_type = LDLM_NS_TYPE_OSC;
 314                         rq_portal = OST_REQUEST_PORTAL;
 315                 }
 316                 rp_portal = OSC_REPLY_PORTAL;
 317                 cli->cl_sp_me = LUSTRE_SP_MDT;
 318         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 319                 rq_portal = MGS_REQUEST_PORTAL;
 320                 rp_portal = MGC_REPLY_PORTAL;
 321                 connect_op = MGS_CONNECT;
 322                 cli->cl_sp_me = LUSTRE_SP_MGC;
 323                 cli->cl_sp_to = LUSTRE_SP_MGS;
 324                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 325                 ns_type = LDLM_NS_TYPE_MGC;
 326         } else {
 327                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 328                        name);
 329                 RETURN(-EINVAL);
 330         }
 331
 332         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 333                 CERROR("requires a TARGET UUID\n");
 334                 RETURN(-EINVAL);
 335         }
 336
 337         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 338                 CERROR("client UUID must be less than 38 characters\n");
 339                 RETURN(-EINVAL);
 340         }
 341
 342         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 343                 CERROR("setup requires a SERVER UUID\n");
 344                 RETURN(-EINVAL);
 345         }
 346
 347         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 348                 CERROR("target UUID must be less than 38 characters\n");
 349                 RETURN(-EINVAL);
 350         }
 351
 352         init_rwsem(&cli->cl_sem);
 353         mutex_init(&cli->cl_mgc_mutex);
 354         cli->cl_seq = NULL;
 355         init_rwsem(&cli->cl_seq_rwsem);
 356         cli->cl_conn_count = 0;
 357         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 358                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 359                      sizeof(server_uuid)));
 360
 361         cli->cl_dirty_pages = 0;
 362         cli->cl_dirty_max_pages = 0;
 363         cli->cl_avail_grant = 0;
 364         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
 365         /* cl_dirty_max_pages may be changed at connect time in
 366          * ptlrpc_connect_interpret(). */
 367         client_adjust_max_dirty(cli);
 368         INIT_LIST_HEAD(&cli->cl_cache_waiters);
 369         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 370         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 371         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 372         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 373         spin_lock_init(&cli->cl_loi_list_lock);
 374         atomic_set(&cli->cl_pending_w_pages, 0);
 375         atomic_set(&cli->cl_pending_r_pages, 0);
 376         cli->cl_r_in_flight = 0;
 377         cli->cl_w_in_flight = 0;
 378
 379         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 380         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 381         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 382         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 383         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 384         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 385
 386         /* lru for osc. */
 387         INIT_LIST_HEAD(&cli->cl_lru_osc);
 388         atomic_set(&cli->cl_lru_shrinkers, 0);
 389         atomic_long_set(&cli->cl_lru_busy, 0);
 390         atomic_long_set(&cli->cl_lru_in_list, 0);
 391         INIT_LIST_HEAD(&cli->cl_lru_list);
 392         spin_lock_init(&cli->cl_lru_list_lock);
 393         atomic_long_set(&cli->cl_unstable_count, 0);
 394         INIT_LIST_HEAD(&cli->cl_shrink_list);
 395         INIT_LIST_HEAD(&cli->cl_grant_chain);
 396
 397         INIT_LIST_HEAD(&cli->cl_flight_waiters);
 398         cli->cl_rpcs_in_flight = 0;
 399
 400         init_waitqueue_head(&cli->cl_destroy_waitq);
 401         atomic_set(&cli->cl_destroy_in_flight, 0);
 402
 403         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 404 #ifdef ENABLE_CHECKSUM
 405         /* Turn on checksumming by default. */
 406         cli->cl_checksum = 1;
 407         /*
 408          * The supported checksum types will be worked out at connect time
 409          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 410          * through procfs.
 411          */
 412         cli->cl_cksum_type = cli->cl_supp_cksum_types;
 413 #endif
 414         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 415
 416         /* Set it to possible maximum size. It may be reduced by ocd_brw_size
 417          * from OFD after connecting. */
 418         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 419
 420         cli->cl_max_short_io_bytes = OBD_MAX_SHORT_IO_BYTES;
 421
 422         /* set cl_chunkbits default value to PAGE_SHIFT,
 423          * it will be updated at OSC connection time. */
 424         cli->cl_chunkbits = PAGE_SHIFT;
 425
 426         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 427                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 428         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
 429                 cli->cl_max_rpcs_in_flight = 2;
 430         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
 431                 cli->cl_max_rpcs_in_flight = 3;
 432         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
 433                 cli->cl_max_rpcs_in_flight = 4;
 434         } else {
 435                 if (osc_on_mdt(obddev->obd_name))
 436                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
 437                 else
 438                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 439         }
 440
 441         spin_lock_init(&cli->cl_mod_rpcs_lock);
 442         spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
 443         cli->cl_max_mod_rpcs_in_flight = 0;
 444         cli->cl_mod_rpcs_in_flight = 0;
 445         cli->cl_close_rpcs_in_flight = 0;
 446         init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
 447         cli->cl_mod_tag_bitmap = NULL;
 448
 449         INIT_LIST_HEAD(&cli->cl_chg_dev_linkage);
 450
 451         if (connect_op == MDS_CONNECT) {
 452                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
 453                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
 454                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 455                 if (cli->cl_mod_tag_bitmap == NULL)
 456                         GOTO(err, rc = -ENOMEM);
 457         }
 458
 459         rc = ldlm_get_ref();
 460         if (rc) {
 461                 CERROR("ldlm_get_ref failed: %d\n", rc);
 462                 GOTO(err, rc);
 463         }
 464
 465         ptlrpc_init_client(rq_portal, rp_portal, name,
 466                            &obddev->obd_ldlm_client);
 467
 468         imp = class_new_import(obddev);
 469         if (imp == NULL)
 470                 GOTO(err_ldlm, rc = -ENOENT);
 471         imp->imp_client = &obddev->obd_ldlm_client;
 472         imp->imp_connect_op = connect_op;
 473         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 474                LUSTRE_CFG_BUFLEN(lcfg, 1));
 475         class_import_put(imp);
 476
 477         if (lustre_cfg_buf(lcfg, 4)) {
 478                 __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
 479
 480                 if (refnet == LNET_NIDNET(LNET_NID_ANY)) {
 481                         rc = -EINVAL;
 482                         CERROR("%s: bad mount option 'network=%s': rc = %d\n",
 483                                obddev->obd_name, lustre_cfg_string(lcfg, 4),
 484                                rc);
 485                         GOTO(err_import, rc);
 486                 }
 487                 fake_conn.c_self = LNET_MKNID(refnet, 0);
 488                 imp->imp_connection = &fake_conn;
 489         }
 490
 491         rc = client_import_add_conn(imp, &server_uuid, 1);
 492         if (rc) {
 493                 CERROR("can't add initial connection\n");
 494                 GOTO(err_import, rc);
 495         }
 496         imp->imp_connection = NULL;
 497
 498         cli->cl_import = imp;
 499         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
 500         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 501
 502         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 503                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 504                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 505                                name, obddev->obd_name,
 506                                cli->cl_target_uuid.uuid);
 507                         spin_lock(&imp->imp_lock);
 508                         imp->imp_deactive = 1;
 509                         spin_unlock(&imp->imp_lock);
 510                 }
 511         }
 512
 513         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 514                                                    LDLM_NAMESPACE_CLIENT,
 515                                                    LDLM_NAMESPACE_GREEDY,
 516                                                    ns_type);
 517         if (obddev->obd_namespace == NULL) {
 518                 CERROR("Unable to create client namespace - %s\n",
 519                        obddev->obd_name);
 520                 GOTO(err_import, rc = -ENOMEM);
 521         }
 522
 523         RETURN(rc);
 524
 525 err_import:
 526         class_destroy_import(imp);
 527 err_ldlm:
 528         ldlm_put_ref();
 529 err:
 530         if (cli->cl_mod_tag_bitmap != NULL)
 531                 OBD_FREE(cli->cl_mod_tag_bitmap,
 532                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 533         cli->cl_mod_tag_bitmap = NULL;
 534         RETURN(rc);
 535
 536 }
 537 EXPORT_SYMBOL(client_obd_setup);
 538
 539 int client_obd_cleanup(struct obd_device *obddev)
 540 {
 541         struct client_obd *cli = &obddev->u.cli;
 542         ENTRY;
 543
 544         ldlm_namespace_free_post(obddev->obd_namespace);
 545         obddev->obd_namespace = NULL;
 546
 547         obd_cleanup_client_import(obddev);
 548         LASSERT(obddev->u.cli.cl_import == NULL);
 549
 550         ldlm_put_ref();
 551
 552         if (cli->cl_mod_tag_bitmap != NULL)
 553                 OBD_FREE(cli->cl_mod_tag_bitmap,
 554                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 555         cli->cl_mod_tag_bitmap = NULL;
 556
 557         RETURN(0);
 558 }
 559 EXPORT_SYMBOL(client_obd_cleanup);
 560
 561 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 562 int client_connect_import(const struct lu_env *env,
 563                           struct obd_export **exp,
 564                           struct obd_device *obd, struct obd_uuid *cluuid,
 565                           struct obd_connect_data *data, void *localdata)
 566 {
 567         struct client_obd       *cli    = &obd->u.cli;
 568         struct obd_import       *imp    = cli->cl_import;
 569         struct obd_connect_data *ocd;
 570         struct lustre_handle    conn    = { 0 };
 571         int                     rc;
 572         ENTRY;
 573
 574         *exp = NULL;
 575         down_write(&cli->cl_sem);
 576         if (cli->cl_conn_count > 0)
 577                 GOTO(out_sem, rc = -EALREADY);
 578
 579         rc = class_connect(&conn, obd, cluuid);
 580         if (rc)
 581                 GOTO(out_sem, rc);
 582
 583         cli->cl_conn_count++;
 584         *exp = class_conn2export(&conn);
 585
 586         LASSERT(obd->obd_namespace);
 587
 588         imp->imp_dlm_handle = conn;
 589         rc = ptlrpc_init_import(imp);
 590         if (rc != 0)
 591                 GOTO(out_ldlm, rc);
 592
 593         ocd = &imp->imp_connect_data;
 594         if (data) {
 595                 *ocd = *data;
 596                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 597                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
 598         }
 599
 600         rc = ptlrpc_connect_import(imp);
 601         if (rc != 0) {
 602                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 603                 GOTO(out_ldlm, rc);
 604         }
 605         LASSERT(*exp != NULL && (*exp)->exp_connection);
 606
 607         if (data) {
 608                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 609                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 610                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 611                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 612                 data->ocd_connect_flags2 = ocd->ocd_connect_flags2;
 613         }
 614
 615         ptlrpc_pinger_add_import(imp);
 616
 617         EXIT;
 618
 619         if (rc) {
 620 out_ldlm:
 621                 cli->cl_conn_count--;
 622                 class_disconnect(*exp);
 623                 *exp = NULL;
 624         }
 625 out_sem:
 626         up_write(&cli->cl_sem);
 627
 628         return rc;
 629 }
 630 EXPORT_SYMBOL(client_connect_import);
 631
 632 int client_disconnect_export(struct obd_export *exp)
 633 {
 634         struct obd_device *obd = class_exp2obd(exp);
 635         struct client_obd *cli;
 636         struct obd_import *imp;
 637         int rc = 0, err;
 638         ENTRY;
 639
 640         if (!obd) {
 641                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 642                        exp, exp ? exp->exp_handle.h_cookie : -1);
 643                 RETURN(-EINVAL);
 644         }
 645
 646         cli = &obd->u.cli;
 647         imp = cli->cl_import;
 648
 649         down_write(&cli->cl_sem);
 650         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
 651                 cli->cl_conn_count);
 652
 653         if (cli->cl_conn_count == 0) {
 654                 CERROR("disconnecting disconnected device (%s)\n",
 655                        obd->obd_name);
 656                 GOTO(out_disconnect, rc = -EINVAL);
 657         }
 658
 659         cli->cl_conn_count--;
 660         if (cli->cl_conn_count != 0)
 661                 GOTO(out_disconnect, rc = 0);
 662
 663         /* Mark import deactivated now, so we don't try to reconnect if any
 664          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 665          * fully deactivate the import, or that would drop all requests. */
 666         spin_lock(&imp->imp_lock);
 667         imp->imp_deactive = 1;
 668         spin_unlock(&imp->imp_lock);
 669
 670         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 671          * delete it regardless.  (It's safe to delete an import that was
 672          * never added.) */
 673         (void)ptlrpc_pinger_del_import(imp);
 674
 675         if (obd->obd_namespace != NULL) {
 676                 /* obd_force == local only */
 677                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 678                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 679                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 680         }
 681
 682         /* There's no need to hold sem while disconnecting an import,
 683          * and it may actually cause deadlock in GSS. */
 684         up_write(&cli->cl_sem);
 685         rc = ptlrpc_disconnect_import(imp, 0);
 686         down_write(&cli->cl_sem);
 687
 688         ptlrpc_invalidate_import(imp);
 689
 690         EXIT;
 691
 692 out_disconnect:
 693         /* Use server style - class_disconnect should be always called for
 694          * o_disconnect. */
 695         err = class_disconnect(exp);
 696         if (!rc && err)
 697                 rc = err;
 698
 699         up_write(&cli->cl_sem);
 700
 701         RETURN(rc);
 702 }
 703 EXPORT_SYMBOL(client_disconnect_export);
 704
 705 #ifdef HAVE_SERVER_SUPPORT
 706 int server_disconnect_export(struct obd_export *exp)
 707 {
 708         int rc;
 709         ENTRY;
 710
 711         /* Disconnect early so that clients can't keep using export. */
 712         rc = class_disconnect(exp);
 713         /* Close import to avoid sending any requests. */
 714         if (exp->exp_imp_reverse)
 715                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 716
 717         ldlm_bl_thread_wakeup();
 718
 719         /* complete all outstanding replies */
 720         spin_lock(&exp->exp_lock);
 721         while (!list_empty(&exp->exp_outstanding_replies)) {
 722                 struct ptlrpc_reply_state *rs =
 723                         list_entry(exp->exp_outstanding_replies.next,
 724                                        struct ptlrpc_reply_state, rs_exp_list);
 725                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 726
 727                 spin_lock(&svcpt->scp_rep_lock);
 728
 729                 list_del_init(&rs->rs_exp_list);
 730
 731                 spin_lock(&rs->rs_lock);
 732                 /* clear rs_convert_lock to make sure rs is handled and put */
 733                 rs->rs_convert_lock = 0;
 734                 ptlrpc_schedule_difficult_reply(rs);
 735                 spin_unlock(&rs->rs_lock);
 736
 737                 spin_unlock(&svcpt->scp_rep_lock);
 738         }
 739         spin_unlock(&exp->exp_lock);
 740
 741         RETURN(rc);
 742 }
 743 EXPORT_SYMBOL(server_disconnect_export);
 744
 745 /* --------------------------------------------------------------------------
 746  * from old lib/target.c
 747  * -------------------------------------------------------------------------- */
 748
 749 static int target_handle_reconnect(struct lustre_handle *conn,
 750                                    struct obd_export *exp,
 751                                    struct obd_uuid *cluuid)
 752 {
 753         struct obd_device *target;
 754         struct lustre_handle *hdl;
 755         ktime_t remaining;
 756         s64 timeout;
 757         int rc = 0;
 758
 759         ENTRY;
 760         hdl = &exp->exp_imp_reverse->imp_remote_handle;
 761         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
 762                 conn->cookie = exp->exp_handle.h_cookie;
 763                 CDEBUG(D_HA, "connect export for UUID '%s' at %p,"
 764                        " cookie %#llx\n", cluuid->uuid, exp, conn->cookie);
 765                 RETURN(0);
 766         }
 767
 768         target = exp->exp_obd;
 769
 770         /* Might be a re-connect after a partition. */
 771         if (memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 772                 LCONSOLE_WARN("%s: already connected client %s (at %s) "
 773                               "with handle %#llx. Rejecting client "
 774                               "with the same UUID trying to reconnect "
 775                               "with handle %#llx\n", target->obd_name,
 776                               obd_uuid2str(&exp->exp_client_uuid),
 777                               obd_export_nid2str(exp),
 778                               hdl->cookie, conn->cookie);
 779                 memset(conn, 0, sizeof *conn);
 780                 /* target_handle_connect() treats EALREADY and
 781                  * -EALREADY differently.  -EALREADY is an error
 782                  * (same UUID, different handle). */
 783                 RETURN(-EALREADY);
 784         }
 785
 786         if (!target->obd_recovering) {
 787                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
 788                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
 789                         obd_export_nid2str(exp));
 790                 GOTO(out_already, rc);
 791         }
 792
 793         remaining = hrtimer_expires_remaining(&target->obd_recovery_timer);
 794         timeout = ktime_divns(remaining, NSEC_PER_SEC);
 795         if (timeout > 0) {
 796                 LCONSOLE_WARN("%s: Client %s (at %s) reconnected, waiting for %d clients in recovery for %lld:%.02lld\n",
 797                               target->obd_name,
 798                               obd_uuid2str(&exp->exp_client_uuid),
 799                               obd_export_nid2str(exp),
 800                               target->obd_max_recoverable_clients,
 801                               timeout / 60, timeout % 60);
 802         } else {
 803                 struct target_distribute_txn_data *tdtd;
 804                 int size = 0;
 805                 int count = 0;
 806                 char *buf = NULL;
 807
 808                 tdtd = class_exp2tgt(exp)->lut_tdtd;
 809                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
 810                         buf = tdtd->tdtd_show_update_logs_retrievers(
 811                                 tdtd->tdtd_show_retrievers_cbdata,
 812                                 &size, &count);
 813
 814                 if (count > 0)
 815                         LCONSOLE_WARN("%s: Client %s (at %s) reconnecting, waiting for %d MDTs (%s) in recovery for %lld:%.02lld. Please wait until all MDTs recovered or you may force MDT evicition via 'lctl --device %s abort_recovery.\n",
 816                                       target->obd_name,
 817                                       obd_uuid2str(&exp->exp_client_uuid),
 818                                       obd_export_nid2str(exp), count,
 819                                       buf ? buf : "unknown (not enough RAM)",
 820                                       (abs(timeout) + target->obd_recovery_timeout) / 60,
 821                                       (abs(timeout) + target->obd_recovery_timeout) % 60,
 822                                       target->obd_name);
 823                 else
 824                         LCONSOLE_WARN("%s: Recovery already passed deadline %lld:%.02lld. If you do not want to wait more, you may force taget eviction via 'lctl --device %s abort_recovery.\n",
 825                                       target->obd_name, abs(timeout) / 60,
 826                                       abs(timeout) % 60, target->obd_name);
 827
 828                 if (buf != NULL)
 829                         OBD_FREE(buf, size);
 830         }
 831
 832 out_already:
 833         conn->cookie = exp->exp_handle.h_cookie;
 834         /* target_handle_connect() treats EALREADY and
 835          * -EALREADY differently.  EALREADY means we are
 836          * doing a valid reconnect from the same client. */
 837         RETURN(EALREADY);
 838 }
 839
 840 static void
 841 check_and_start_recovery_timer(struct obd_device *obd,
 842                                struct ptlrpc_request *req, int new_client);
 843
 844 /**
 845  * update flags for import during reconnect process
 846  */
 847 static int rev_import_flags_update(struct obd_import *revimp,
 848                                    struct ptlrpc_request *req)
 849 {
 850         int rc;
 851         struct obd_connect_data *data;
 852
 853         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 854
 855         if (data->ocd_connect_flags & OBD_CONNECT_AT)
 856                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 857         else
 858                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 859
 860         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
 861
 862         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
 863         if (rc) {
 864                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
 865                         revimp->imp_client->cli_name,
 866                         libcfs_id2str(req->rq_peer), rc);
 867                 return rc;
 868         }
 869
 870         return 0;
 871 }
 872
 873 /**
 874  * Allocate a new reverse import for an export.
 875  *
 876  * \retval -errno in case error hit
 877  * \retval 0 if reverse import correctly init
 878  **/
 879 int rev_import_init(struct obd_export *export)
 880 {
 881         struct obd_device *obd = export->exp_obd;
 882         struct obd_import *revimp;
 883
 884         LASSERT(export->exp_imp_reverse == NULL);
 885
 886         revimp = class_new_import(obd);
 887         if (revimp == NULL)
 888                 return -ENOMEM;
 889
 890         revimp->imp_remote_handle.cookie = 0ULL;
 891         revimp->imp_client = &obd->obd_ldlm_client;
 892         revimp->imp_dlm_fake = 1;
 893
 894         /* it is safe to connect import in new state as no sends possible */
 895         spin_lock(&export->exp_lock);
 896         export->exp_imp_reverse = revimp;
 897         spin_unlock(&export->exp_lock);
 898         class_import_put(revimp);
 899
 900         return 0;
 901 }
 902 EXPORT_SYMBOL(rev_import_init);
 903
 904 /**
 905  * Handle reconnect for an export.
 906  *
 907  * \param exp export to handle reconnect process
 908  * \param req client reconnect request
 909  *
 910  * \retval -rc in case securitfy flavor can't be changed
 911  * \retval 0 in case none problems
 912  */
 913 static int rev_import_reconnect(struct obd_export *exp,
 914                                 struct ptlrpc_request *req)
 915 {
 916         struct obd_import *revimp = exp->exp_imp_reverse;
 917         struct lustre_handle *lh;
 918         int rc;
 919
 920         /* avoid sending a request until import flags are changed */
 921         ptlrpc_import_enter_resend(revimp);
 922
 923         if (revimp->imp_connection != NULL)
 924                 ptlrpc_connection_put(revimp->imp_connection);
 925
 926         /*
 927          * client from recovery don't have a handle so we need to take from
 928          * request. it may produce situation when wrong client connected
 929          * to recovery as we trust a client uuid
 930          */
 931         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 932         revimp->imp_remote_handle = *lh;
 933
 934         /* unknown versions will be caught in
 935          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
 936         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
 937
 938         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
 939
 940         rc = rev_import_flags_update(revimp, req);
 941         if (rc != 0) {
 942                 /* it is safe to still be in RECOVERY phase as we are not able
 943                  * to setup correct security flavor so requests are not able to
 944                  * be delivered correctly */
 945                 return rc;
 946         }
 947
 948         /* resend all rpc's via new connection */
 949         return ptlrpc_import_recovery_state_machine(revimp);
 950 }
 951
 952 int target_handle_connect(struct ptlrpc_request *req)
 953 {
 954         struct obd_device *target = NULL;
 955         struct obd_export *export = NULL;
 956         /* connect handle - filled from target_handle_reconnect in
 957          * reconnect case */
 958         struct lustre_handle conn;
 959         struct lustre_handle *tmp;
 960         struct obd_uuid cluuid;
 961         char *str;
 962         int rc = 0;
 963         char *target_start;
 964         int target_len;
 965         bool     mds_conn = false, lw_client = false, initial_conn = false;
 966         bool     mds_mds_conn = false;
 967         bool     new_mds_mds_conn = false;
 968         struct obd_connect_data *data, *tmpdata;
 969         int size, tmpsize;
 970         lnet_nid_t *client_nid = NULL;
 971         ENTRY;
 972
 973         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 974
 975         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 976         if (str == NULL) {
 977                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 978                 GOTO(out, rc = -EINVAL);
 979         }
 980
 981         target = class_dev_by_str(str);
 982         if (!target) {
 983                 deuuidify(str, NULL, &target_start, &target_len);
 984                 LCONSOLE_ERROR_MSG(0x137, "%s: not available for connect "
 985                                    "from %s (no target). If you are running "
 986                                    "an HA pair check that the target is "
 987                                    "mounted on the other server.\n", str,
 988                                    libcfs_nid2str(req->rq_peer.nid));
 989                 GOTO(out, rc = -ENODEV);
 990         }
 991
 992         spin_lock(&target->obd_dev_lock);
 993
 994         target->obd_conn_inprogress++;
 995
 996         if (target->obd_stopping || !target->obd_set_up) {
 997                 spin_unlock(&target->obd_dev_lock);
 998
 999                 deuuidify(str, NULL, &target_start, &target_len);
1000                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
1001                               target_len, target_start,
1002                               libcfs_nid2str(req->rq_peer.nid),
1003                               (target->obd_stopping ?
1004                                "stopping" : "not set up"));
1005                 GOTO(out, rc = -ENODEV);
1006         }
1007
1008         if (target->obd_no_conn) {
1009                 spin_unlock(&target->obd_dev_lock);
1010
1011                 CDEBUG(D_INFO, "%s: Temporarily refusing client connection "
1012                                "from %s\n", target->obd_name,
1013                                libcfs_nid2str(req->rq_peer.nid));
1014                 GOTO(out, rc = -EAGAIN);
1015         }
1016
1017         spin_unlock(&target->obd_dev_lock);
1018
1019         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1020         if (str == NULL) {
1021                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1022                 GOTO(out, rc = -EINVAL);
1023         }
1024
1025         obd_str2uuid(&cluuid, str);
1026
1027         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1028         if (tmp == NULL)
1029                 GOTO(out, rc = -EPROTO);
1030
1031         conn = *tmp;
1032
1033         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1034                                     RCL_CLIENT);
1035         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1036         if (!data)
1037                 GOTO(out, rc = -EPROTO);
1038
1039         rc = req_capsule_server_pack(&req->rq_pill);
1040         if (rc)
1041                 GOTO(out, rc);
1042
1043 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1044         /* Don't allow clients to connect that are using old 1.8 format
1045          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1046          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1047          * FULL20 flag should be set on all connections since 2.0, but no
1048          * longer affects behaviour.
1049          *
1050          * Later this check will be disabled and the flag can be retired
1051          * completely once interop with 3.0 is no longer needed.
1052          */
1053         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1054                 GOTO(out, rc = -EPROTO);
1055
1056         /* Don't allow liblustre clients to connect.
1057          * - testing was disabled in v2_2_50_0-61-g6a75d65
1058          * - building was disabled in v2_5_58_0-28-g7277179
1059          * - client code was deleted in v2_6_50_0-101-gcdfbc72,
1060          * - clients were refused connect for version difference > 0.0.1.32  */
1061         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1062                 DEBUG_REQ(D_WARNING, req, "Refusing libclient connection");
1063                 GOTO(out, rc = -EPROTO);
1064         }
1065 #endif
1066
1067         /* Note: lw_client is needed in MDS-MDS failover during update log
1068          * processing, so we needs to allow lw_client to be connected at
1069          * anytime, instead of only the initial connection */
1070         lw_client = (data->ocd_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0;
1071
1072         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1073                 initial_conn = true;
1074                 mds_conn = (data->ocd_connect_flags & OBD_CONNECT_MDS) != 0;
1075                 mds_mds_conn = (data->ocd_connect_flags &
1076                                 OBD_CONNECT_MDS_MDS) != 0;
1077
1078                 /* OBD_CONNECT_MNE_SWAB is defined as OBD_CONNECT_MDS_MDS
1079                  * for Imperative Recovery connection from MGC to MGS.
1080                  *
1081                  * Via check OBD_CONNECT_FID, we can distinguish whether
1082                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1083                  * MGC or MDT, since MGC does not use OBD_CONNECT_FID.
1084                  */
1085                 if (!lw_client &&
1086                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1087                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1088                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1089                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1090                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1091                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1092
1093                         /* We do not support the MDT-MDT interoperations with
1094                          * different version MDT because of protocol changes. */
1095                         if (unlikely(major != LUSTRE_MAJOR ||
1096                                      minor != LUSTRE_MINOR ||
1097                                      abs(patch - LUSTRE_PATCH) > 3)) {
1098                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the "
1099                                         "connection from different version MDT "
1100                                         "(%d.%d.%d.%d) %s %s\n",
1101                                         target->obd_name, LUSTRE_MAJOR,
1102                                         LUSTRE_MINOR, LUSTRE_PATCH, LUSTRE_FIX,
1103                                         major, minor, patch,
1104                                         OBD_OCD_VERSION_FIX(data->ocd_version),
1105                                         libcfs_nid2str(req->rq_peer.nid), str);
1106
1107                                 GOTO(out, rc = -EPROTO);
1108                         }
1109                 }
1110         }
1111
1112         /* lctl gets a backstage, all-access pass. */
1113         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1114                 goto dont_check_exports;
1115
1116         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
1117         if (!export)
1118                 goto no_export;
1119
1120         /* We've found an export in the hash. */
1121
1122         spin_lock(&export->exp_lock);
1123
1124         if (export->exp_connecting) { /* bug 9635, et. al. */
1125                 spin_unlock(&export->exp_lock);
1126                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1127                               export->exp_obd->obd_name, export,
1128                               libcfs_nid2str(req->rq_peer.nid));
1129                 class_export_put(export);
1130                 export = NULL;
1131                 rc = -EALREADY;
1132         } else if ((mds_conn || (lw_client && initial_conn) ||
1133                    data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1134                    export->exp_connection != NULL) {
1135                 spin_unlock(&export->exp_lock);
1136                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1137                         /* MDS or LWP reconnected after failover. */
1138                         LCONSOLE_WARN("%s: Received %s connection from "
1139                             "%s, removing former export from %s\n",
1140                             target->obd_name, mds_conn ? "MDS" : "LWP",
1141                             libcfs_nid2str(req->rq_peer.nid),
1142                             libcfs_nid2str(export->exp_connection->c_peer.nid));
1143                 } else {
1144                         /* New MDS connection from the same NID. */
1145                         LCONSOLE_WARN("%s: Received new %s connection from "
1146                                 "%s, removing former export from same NID\n",
1147                                 target->obd_name, mds_conn ? "MDS" : "LWP",
1148                                 libcfs_nid2str(req->rq_peer.nid));
1149                 }
1150
1151                 if (req->rq_peer.nid == export->exp_connection->c_peer.nid &&
1152                     data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) {
1153                         /* Because exports between MDTs will always be
1154                          * kept, let's do not fail such export if they
1155                          * come from the same NID, otherwise it might
1156                          * cause eviction between MDTs, which might
1157                          * cause namespace inconsistency */
1158                         spin_lock(&export->exp_lock);
1159                         export->exp_connecting = 1;
1160                         export->exp_conn_cnt = 0;
1161                         spin_unlock(&export->exp_lock);
1162                         conn.cookie = export->exp_handle.h_cookie;
1163                         rc = EALREADY;
1164                 } else {
1165                         class_fail_export(export);
1166                         class_export_put(export);
1167                         export = NULL;
1168                         rc = 0;
1169                 }
1170         } else if (export->exp_connection != NULL && initial_conn &&
1171                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
1172                 spin_unlock(&export->exp_lock);
1173                 /* In MDS failover we have static UUID but NID can change. */
1174                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when "
1175                               "existing nid %s is already connected\n",
1176                               target->obd_name, cluuid.uuid,
1177                               libcfs_nid2str(req->rq_peer.nid),
1178                               libcfs_nid2str(
1179                                       export->exp_connection->c_peer.nid));
1180                 rc = -EALREADY;
1181                 class_export_put(export);
1182                 export = NULL;
1183         } else {
1184                 export->exp_connecting = 1;
1185                 spin_unlock(&export->exp_lock);
1186                 LASSERT(export->exp_obd == target);
1187
1188                 rc = target_handle_reconnect(&conn, export, &cluuid);
1189         }
1190
1191         /* If we found an export, we already unlocked. */
1192         if (!export) {
1193 no_export:
1194                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1195         } else if (req->rq_export == NULL &&
1196                    atomic_read(&export->exp_rpc_count) > 0) {
1197                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, "
1198                               "still busy with %d references\n",
1199                               target->obd_name, cluuid.uuid,
1200                               libcfs_nid2str(req->rq_peer.nid),
1201                               atomic_read(&export->exp_refcount));
1202                         GOTO(out, rc = -EBUSY);
1203         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
1204                    rc != EALREADY) {
1205                 if (!strstr(cluuid.uuid, "mdt"))
1206                         LCONSOLE_WARN("%s: Rejecting reconnect from the "
1207                                       "known client %s (at %s) because it "
1208                                       "is indicating it is a new client",
1209                                       target->obd_name, cluuid.uuid,
1210                                       libcfs_nid2str(req->rq_peer.nid));
1211                 GOTO(out, rc = -EALREADY);
1212         } else {
1213                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1214         }
1215
1216         if (rc < 0) {
1217                 GOTO(out, rc);
1218         }
1219
1220         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %lld last %lld\n",
1221                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1222                target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1223                export, ktime_get_real_seconds(),
1224                export ? export->exp_last_request_time : 0);
1225
1226         /* If this is the first time a client connects, reset the recovery
1227          * timer. Discard lightweight connections which might be local. */
1228         if (!lw_client && rc == 0 && target->obd_recovering)
1229                 check_and_start_recovery_timer(target, req, export == NULL);
1230
1231         /* We want to handle EALREADY but *not* -EALREADY from
1232          * target_handle_reconnect(), return reconnection state in a flag. */
1233         if (rc == EALREADY) {
1234                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1235                 rc = 0;
1236         } else {
1237                 LASSERT(rc == 0);
1238         }
1239
1240         /* Tell the client if we support replayable requests. */
1241         if (target->obd_replayable)
1242                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1243         client_nid = &req->rq_peer.nid;
1244
1245         if (export == NULL) {
1246                 /* allow lightweight connections during recovery */
1247                 /* allow "new" MDT to be connected during recovery, since we
1248                  * need retrieve recovery update records from it */
1249                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1250                         struct hrtimer *timer = &target->obd_recovery_timer;
1251                         ktime_t remaining;
1252                         s64 timeout, left;
1253                         int in_progress;
1254                         int connected;
1255                         int known;
1256                         int stale;
1257                         char *msg;
1258
1259                         connected = atomic_read(&target->obd_connected_clients);
1260                         in_progress = atomic_read(&target->obd_lock_replay_clients);
1261                         known = target->obd_max_recoverable_clients;
1262                         stale = target->obd_stale_clients;
1263                         remaining = hrtimer_expires_remaining(timer);
1264                         left = ktime_divns(remaining, NSEC_PER_SEC);
1265                         if (ktime_to_ns(remaining) > 0) {
1266                                 msg = "to recover in";
1267                                 timeout = left;
1268                         } else {
1269                                 msg = "already passed deadline";
1270                                 timeout = -left;
1271                         }
1272
1273                         LCONSOLE_WARN("%s: Denying connection for new client %s (at %s), waiting for %d known clients (%d recovered, %d in progress, and %d evicted) %s %lld:%.02lld\n",
1274                                       target->obd_name, cluuid.uuid,
1275                                       libcfs_nid2str(req->rq_peer.nid), known,
1276                                       connected - in_progress, in_progress,
1277                                       stale, msg, timeout / 60, timeout % 60);
1278                         rc = -EBUSY;
1279                 } else {
1280 dont_check_exports:
1281                         rc = obd_connect(req->rq_svc_thread->t_env,
1282                                          &export, target, &cluuid, data,
1283                                          client_nid);
1284                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1285                                 lustre_msg_add_op_flags(req->rq_repmsg,
1286                                                         MSG_CONNECT_RECOVERING);
1287                         if (rc == 0) {
1288                                 conn.cookie = export->exp_handle.h_cookie;
1289                                 rc = rev_import_init(export);
1290                         }
1291
1292                         if (mds_mds_conn)
1293                                 new_mds_mds_conn = true;
1294                 }
1295         } else {
1296                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1297                                    export, target, &cluuid, data, client_nid);
1298         }
1299         if (rc)
1300                 GOTO(out, rc);
1301
1302         LASSERT(target->u.obt.obt_magic == OBT_MAGIC);
1303         data->ocd_instance = target->u.obt.obt_instance;
1304
1305         /* Return only the parts of obd_connect_data that we understand, so the
1306          * client knows that we don't understand the rest. */
1307         if (data) {
1308                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1309                                                RCL_SERVER);
1310                 tmpdata = req_capsule_server_get(&req->rq_pill,
1311                                                  &RMF_CONNECT_DATA);
1312                 /* Don't use struct assignment here, because the client reply
1313                  * buffer may be smaller/larger than the local struct
1314                  * obd_connect_data. */
1315                 memcpy(tmpdata, data, min(tmpsize, size));
1316         }
1317
1318         /* If the client and the server are the same node, we will already
1319          * have an export that really points to the client's DLM export,
1320          * because we have a shared handles table.
1321          *
1322          * XXX this will go away when shaver stops sending the "connect" handle
1323          * in the real "remote handle" field of the request --phik 24 Apr 2003
1324          */
1325         ptlrpc_request_change_export(req, export);
1326
1327         spin_lock(&export->exp_lock);
1328         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1329                 spin_unlock(&export->exp_lock);
1330                 CDEBUG(D_RPCTRACE, "%s: %s already connected at greater "
1331                        "or equal conn_cnt: %d >= %d\n",
1332                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1333                        export->exp_conn_cnt,
1334                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1335
1336                 GOTO(out, rc = -EALREADY);
1337         }
1338         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1339         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1340         spin_unlock(&export->exp_lock);
1341
1342         if (export->exp_connection != NULL) {
1343                 /* Check to see if connection came from another NID. */
1344                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
1345                     !hlist_unhashed(&export->exp_nid_hash))
1346                         cfs_hash_del(export->exp_obd->obd_nid_hash,
1347                                      &export->exp_connection->c_peer.nid,
1348                                      &export->exp_nid_hash);
1349
1350                 ptlrpc_connection_put(export->exp_connection);
1351         }
1352
1353         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
1354                                                        req->rq_self,
1355                                                        &cluuid);
1356         if (hlist_unhashed(&export->exp_nid_hash))
1357                 cfs_hash_add(export->exp_obd->obd_nid_hash,
1358                              &export->exp_connection->c_peer.nid,
1359                              &export->exp_nid_hash);
1360
1361         lustre_msg_set_handle(req->rq_repmsg, &conn);
1362
1363         rc = rev_import_reconnect(export, req);
1364         if (rc != 0)
1365                 GOTO(out, rc);
1366
1367         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1368                 int has_transno;
1369                 __u64 transno = data->ocd_transno;
1370
1371                 spin_lock(&export->exp_lock);
1372                 /* possible race with class_disconnect_stale_exports,
1373                  * export may be already in the eviction process */
1374                 if (export->exp_failed) {
1375                         spin_unlock(&export->exp_lock);
1376                         GOTO(out, rc = -ENODEV);
1377                 }
1378                 export->exp_in_recovery = 1;
1379                 export->exp_req_replay_needed = 1;
1380                 export->exp_lock_replay_needed = 1;
1381                 spin_unlock(&export->exp_lock);
1382
1383                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1384                                  MSG_CONNECT_TRANSNO);
1385                 if (has_transno && transno == 0)
1386                         CWARN("Connect with zero transno!\n");
1387
1388                 if (has_transno && transno > 0 &&
1389                     transno < target->obd_next_recovery_transno &&
1390                     transno > target->obd_last_committed) {
1391                         /* Another way is to use cmpxchg() to be lock-free. */
1392                         spin_lock(&target->obd_recovery_task_lock);
1393                         if (transno < target->obd_next_recovery_transno)
1394                                 target->obd_next_recovery_transno = transno;
1395                         spin_unlock(&target->obd_recovery_task_lock);
1396                 }
1397
1398                 atomic_inc(&target->obd_req_replay_clients);
1399                 atomic_inc(&target->obd_lock_replay_clients);
1400                 /* Note: MDS-MDS connection is allowed to be connected during
1401                  * recovery, no matter if the exports needs to be recoveried.
1402                  * Because we need retrieve updates logs from all other MDTs.
1403                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1404                  * also needs to be increased to match other recovery checking
1405                  * condition. */
1406                 if (new_mds_mds_conn)
1407                         target->obd_max_recoverable_clients++;
1408                 if (atomic_inc_return(&target->obd_connected_clients) ==
1409                     target->obd_max_recoverable_clients)
1410                         wake_up(&target->obd_next_transno_waitq);
1411         }
1412
1413         /* Tell the client we're in recovery, when client is involved in it. */
1414         if (target->obd_recovering && !lw_client)
1415                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1416
1417 out:
1418         if (export) {
1419                 spin_lock(&export->exp_lock);
1420                 export->exp_connecting = 0;
1421                 spin_unlock(&export->exp_lock);
1422
1423                 class_export_put(export);
1424         }
1425         if (target != NULL) {
1426                 spin_lock(&target->obd_dev_lock);
1427                 target->obd_conn_inprogress--;
1428                 spin_unlock(&target->obd_dev_lock);
1429                 class_decref(target, "find", current);
1430         }
1431         req->rq_status = rc;
1432         RETURN(rc);
1433 }
1434
1435 int target_handle_disconnect(struct ptlrpc_request *req)
1436 {
1437         int rc;
1438         ENTRY;
1439
1440         rc = req_capsule_server_pack(&req->rq_pill);
1441         if (rc)
1442                 RETURN(rc);
1443
1444         /* Keep the rq_export around so we can send the reply. */
1445         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1446
1447         RETURN(0);
1448 }
1449
1450 void target_destroy_export(struct obd_export *exp)
1451 {
1452         struct obd_import       *imp = NULL;
1453         /* exports created from last_rcvd data, and "fake"
1454            exports created by lctl don't have an import */
1455         spin_lock(&exp->exp_lock);
1456         if (exp->exp_imp_reverse != NULL) {
1457                 imp = exp->exp_imp_reverse;
1458                 exp->exp_imp_reverse = NULL;
1459         }
1460         spin_unlock(&exp->exp_lock);
1461         if (imp != NULL)
1462                 client_destroy_import(imp);
1463
1464         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1465         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1466         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1467         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1468 }
1469 EXPORT_SYMBOL(target_destroy_export);
1470
1471 /*
1472  * Recovery functions
1473  */
1474 static void target_request_copy_get(struct ptlrpc_request *req)
1475 {
1476         class_export_rpc_inc(req->rq_export);
1477         LASSERT(list_empty(&req->rq_list));
1478         INIT_LIST_HEAD(&req->rq_replay_list);
1479
1480         /* Increase refcount to keep request in queue. */
1481         atomic_inc(&req->rq_refcount);
1482         /* Let export know it has replays to be handled. */
1483         atomic_inc(&req->rq_export->exp_replay_count);
1484 }
1485
1486 static void target_request_copy_put(struct ptlrpc_request *req)
1487 {
1488         LASSERT(list_empty(&req->rq_replay_list));
1489         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1490
1491         atomic_dec(&req->rq_export->exp_replay_count);
1492         class_export_rpc_dec(req->rq_export);
1493         ptlrpc_server_drop_request(req);
1494 }
1495
1496 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1497 {
1498         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1499         struct obd_export     *exp = req->rq_export;
1500         struct ptlrpc_request *reqiter;
1501         struct ptlrpc_request *dup_req = NULL;
1502         int                    dup = 0;
1503
1504         LASSERT(exp);
1505
1506         spin_lock(&exp->exp_lock);
1507         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1508                                 rq_replay_list) {
1509                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1510                         dup_req = reqiter;
1511                         dup = 1;
1512                         break;
1513                 }
1514         }
1515
1516         if (dup) {
1517                 /* We expect it with RESENT and REPLAY flags. */
1518                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1519                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1520                         CERROR("invalid flags %x of resent replay\n",
1521                                lustre_msg_get_flags(req->rq_reqmsg));
1522
1523                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1524                         __u32 new_conn;
1525
1526                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1527                         if (new_conn >
1528                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1529                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1530                                                         new_conn);
1531                 }
1532         } else {
1533                 list_add_tail(&req->rq_replay_list,
1534                                   &exp->exp_req_replay_queue);
1535         }
1536
1537         spin_unlock(&exp->exp_lock);
1538         return dup;
1539 }
1540
1541 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1542 {
1543         LASSERT(!list_empty(&req->rq_replay_list));
1544         LASSERT(req->rq_export);
1545
1546         spin_lock(&req->rq_export->exp_lock);
1547         list_del_init(&req->rq_replay_list);
1548         spin_unlock(&req->rq_export->exp_lock);
1549 }
1550
1551 static void target_finish_recovery(struct lu_target *lut)
1552 {
1553         struct obd_device *obd = lut->lut_obd;
1554         ENTRY;
1555
1556         /* Only log a recovery message when recovery has occurred. */
1557         if (obd->obd_recovery_start) {
1558                 time64_t now = ktime_get_real_seconds();
1559                 time64_t elapsed_time;
1560
1561                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start, 1);
1562                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients "
1563                         "%d recovered and %d %s evicted.\n", obd->obd_name,
1564                         (s64)elapsed_time / 60, (s64)elapsed_time % 60,
1565                         obd->obd_max_recoverable_clients,
1566                         atomic_read(&obd->obd_connected_clients),
1567                         obd->obd_stale_clients,
1568                         obd->obd_stale_clients == 1 ? "was" : "were");
1569         }
1570
1571         ldlm_reprocess_recovery_done(obd->obd_namespace);
1572         spin_lock(&obd->obd_recovery_task_lock);
1573         if (!list_empty(&obd->obd_req_replay_queue) ||
1574             !list_empty(&obd->obd_lock_replay_queue) ||
1575             !list_empty(&obd->obd_final_req_queue)) {
1576                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1577                        obd->obd_name,
1578                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1579                        list_empty(&obd->obd_lock_replay_queue) ? \
1580                                "" : "lock ",
1581                        list_empty(&obd->obd_final_req_queue) ? \
1582                                "" : "final ");
1583                 spin_unlock(&obd->obd_recovery_task_lock);
1584                 LBUG();
1585         }
1586         spin_unlock(&obd->obd_recovery_task_lock);
1587
1588         obd->obd_recovery_end = ktime_get_real_seconds();
1589
1590         /* When recovery finished, cleanup orphans on MDS and OST. */
1591         if (obd->obd_type && OBP(obd, postrecov)) {
1592                 int rc = OBP(obd, postrecov)(obd);
1593
1594                 if (rc < 0)
1595                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1596                                       obd->obd_name, rc);
1597         }
1598         EXIT;
1599 }
1600
1601 static void abort_req_replay_queue(struct obd_device *obd)
1602 {
1603         struct ptlrpc_request *req, *n;
1604         struct list_head abort_list;
1605
1606         INIT_LIST_HEAD(&abort_list);
1607         spin_lock(&obd->obd_recovery_task_lock);
1608         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1609         spin_unlock(&obd->obd_recovery_task_lock);
1610         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1611                 DEBUG_REQ(D_WARNING, req, "aborted:");
1612                 req->rq_status = -ENOTCONN;
1613                 if (ptlrpc_error(req)) {
1614                         DEBUG_REQ(D_ERROR, req,
1615                                   "failed abort_req_reply; skipping");
1616                 }
1617                 target_exp_dequeue_req_replay(req);
1618                 target_request_copy_put(req);
1619         }
1620 }
1621
1622 static void abort_lock_replay_queue(struct obd_device *obd)
1623 {
1624         struct ptlrpc_request *req, *n;
1625         struct list_head abort_list;
1626
1627         INIT_LIST_HEAD(&abort_list);
1628         spin_lock(&obd->obd_recovery_task_lock);
1629         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1630         spin_unlock(&obd->obd_recovery_task_lock);
1631         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1632                 DEBUG_REQ(D_ERROR, req, "aborted:");
1633                 req->rq_status = -ENOTCONN;
1634                 if (ptlrpc_error(req)) {
1635                         DEBUG_REQ(D_ERROR, req,
1636                                   "failed abort_lock_reply; skipping");
1637                 }
1638                 target_request_copy_put(req);
1639         }
1640 }
1641
1642 /* Called from a cleanup function if the device is being cleaned up
1643    forcefully.  The exports should all have been disconnected already,
1644    the only thing left to do is
1645      - clear the recovery flags
1646      - cancel the timer
1647      - free queued requests and replies, but don't send replies
1648    Because the obd_stopping flag is set, no new requests should be received.
1649
1650 */
1651 void target_cleanup_recovery(struct obd_device *obd)
1652 {
1653         struct ptlrpc_request *req, *n;
1654         struct list_head clean_list;
1655
1656         INIT_LIST_HEAD(&clean_list);
1657         spin_lock(&obd->obd_dev_lock);
1658         if (!obd->obd_recovering) {
1659                 spin_unlock(&obd->obd_dev_lock);
1660                 EXIT;
1661                 return;
1662         }
1663         obd->obd_recovering = obd->obd_abort_recovery = 0;
1664         spin_unlock(&obd->obd_dev_lock);
1665
1666         spin_lock(&obd->obd_recovery_task_lock);
1667         target_cancel_recovery_timer(obd);
1668         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1669         spin_unlock(&obd->obd_recovery_task_lock);
1670
1671         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1672                 LASSERT(req->rq_reply_state == NULL);
1673                 target_exp_dequeue_req_replay(req);
1674                 target_request_copy_put(req);
1675         }
1676
1677         spin_lock(&obd->obd_recovery_task_lock);
1678         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1679         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1680         spin_unlock(&obd->obd_recovery_task_lock);
1681
1682         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1683                 LASSERT(req->rq_reply_state == NULL);
1684                 target_request_copy_put(req);
1685         }
1686
1687         EXIT;
1688 }
1689 EXPORT_SYMBOL(target_cleanup_recovery);
1690
1691 /* obd_recovery_task_lock should be held */
1692 void target_cancel_recovery_timer(struct obd_device *obd)
1693 {
1694         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1695         hrtimer_cancel(&obd->obd_recovery_timer);
1696 }
1697
1698 static void target_start_recovery_timer(struct obd_device *obd)
1699 {
1700         ktime_t delay;
1701
1702         if (obd->obd_recovery_start != 0)
1703                 return;
1704
1705         spin_lock(&obd->obd_dev_lock);
1706         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1707                 spin_unlock(&obd->obd_dev_lock);
1708                 return;
1709         }
1710
1711         LASSERT(obd->obd_recovery_timeout != 0);
1712
1713         if (obd->obd_recovery_start != 0) {
1714                 spin_unlock(&obd->obd_dev_lock);
1715                 return;
1716         }
1717
1718         delay = ktime_set(obd->obd_recovery_timeout, 0);
1719         hrtimer_start(&obd->obd_recovery_timer, delay, HRTIMER_MODE_REL);
1720         obd->obd_recovery_start = ktime_get_real_seconds();
1721         spin_unlock(&obd->obd_dev_lock);
1722
1723         LCONSOLE_WARN("%s: Will be in recovery for at least %llu:%02llu, or until %d client%s reconnect%s\n",
1724                       obd->obd_name,
1725                       obd->obd_recovery_timeout / 60,
1726                       obd->obd_recovery_timeout % 60,
1727                       obd->obd_max_recoverable_clients,
1728                       (obd->obd_max_recoverable_clients == 1) ? "" : "s",
1729                       (obd->obd_max_recoverable_clients == 1) ? "s": "");
1730 }
1731
1732 /**
1733  * extend recovery window.
1734  *
1735  * if @extend is true, extend recovery window to have @drt remaining at least;
1736  * otherwise, make sure the recovery timeout value is not less than @drt.
1737  */
1738 static void extend_recovery_timer(struct obd_device *obd, time_t drt,
1739                                   bool extend)
1740 {
1741         ktime_t left_ns;
1742         time_t left;
1743         time_t to;
1744
1745         spin_lock(&obd->obd_dev_lock);
1746         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1747                 spin_unlock(&obd->obd_dev_lock);
1748                 return;
1749         }
1750         LASSERT(obd->obd_recovery_start != 0);
1751
1752         to = obd->obd_recovery_timeout;
1753         left_ns = hrtimer_expires_remaining(&obd->obd_recovery_timer);
1754         left = ktime_divns(left_ns, NSEC_PER_SEC);
1755         if (extend && (drt > left))
1756                 to += drt - left;
1757         else if (!extend && (drt > to))
1758                 to = drt;
1759
1760         if (to > obd->obd_recovery_time_hard) {
1761                 to = obd->obd_recovery_time_hard;
1762                 CWARN("%s: extended recovery timer reaching hard limit: %ld, extend: %d\n",
1763                       obd->obd_name, to, extend);
1764         }
1765
1766         if (obd->obd_recovery_timeout < to) {
1767                 ktime_t now = ktime_get_real();
1768                 ktime_t end;
1769
1770                 obd->obd_recovery_timeout = to;
1771                 end = ktime_set(obd->obd_recovery_start + to, 0);
1772                 left_ns = ktime_sub(end, now);
1773                 hrtimer_forward_now(&obd->obd_recovery_timer, left_ns);
1774                 left = ktime_divns(left_ns, NSEC_PER_MSEC);
1775         }
1776         spin_unlock(&obd->obd_dev_lock);
1777
1778         CDEBUG(D_HA, "%s: recovery timer will expire in %ld seconds\n",
1779                 obd->obd_name, left);
1780 }
1781
1782 /* Reset the timer with each new client connection */
1783 /*
1784  * This timer is actually reconnect_timer, which is for making sure
1785  * the total recovery window is at least as big as my reconnect
1786  * attempt timing. So the initial recovery time_out will be set to
1787  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1788  * from client is bigger than this, then the recovery time_out will
1789  * be extended to make sure the client could be reconnected, in the
1790  * process, the timeout from the new client should be ignored.
1791  */
1792 static void
1793 check_and_start_recovery_timer(struct obd_device *obd,
1794                                struct ptlrpc_request *req,
1795                                int new_client)
1796 {
1797         time_t service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1798         struct obd_device_target *obt = &obd->u.obt;
1799
1800         if (!new_client && service_time)
1801                 /* Teach server about old server's estimates, as first guess
1802                  * at how long new requests will take.
1803                  */
1804                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
1805                             service_time);
1806
1807         target_start_recovery_timer(obd);
1808
1809         /* Convert the service time to RPC timeout,
1810          * and reuse service_time to limit stack usage.
1811          */
1812         service_time = at_est2timeout(service_time);
1813
1814         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
1815             service_time < at_extra)
1816                 service_time = at_extra;
1817
1818         /* We expect other clients to timeout within service_time, then try
1819          * to reconnect, then try the failover server.  The max delay between
1820          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL. */
1821         service_time += 2 * INITIAL_CONNECT_TIMEOUT;
1822
1823         LASSERT(obt->obt_magic == OBT_MAGIC);
1824         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
1825         if (service_time > obd->obd_recovery_timeout && !new_client)
1826                 extend_recovery_timer(obd, service_time, false);
1827 }
1828
1829 /** Health checking routines */
1830 static inline int exp_connect_healthy(struct obd_export *exp)
1831 {
1832         return (exp->exp_in_recovery);
1833 }
1834
1835 /** if export done req_replay or has replay in queue */
1836 static inline int exp_req_replay_healthy(struct obd_export *exp)
1837 {
1838         return (!exp->exp_req_replay_needed ||
1839                 atomic_read(&exp->exp_replay_count) > 0);
1840 }
1841
1842
1843 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
1844 {
1845         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1846                exp_req_replay_healthy(exp);
1847 }
1848
1849 /** if export done lock_replay or has replay in queue */
1850 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1851 {
1852         return (!exp->exp_lock_replay_needed ||
1853                 atomic_read(&exp->exp_replay_count) > 0);
1854 }
1855
1856 static inline int exp_vbr_healthy(struct obd_export *exp)
1857 {
1858         return (!exp->exp_vbr_failed);
1859 }
1860
1861 static inline int exp_finished(struct obd_export *exp)
1862 {
1863         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1864 }
1865
1866 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
1867 {
1868         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
1869                 exp_finished(exp);
1870 }
1871
1872 static int check_for_next_transno(struct lu_target *lut)
1873 {
1874         struct ptlrpc_request *req = NULL;
1875         struct obd_device *obd = lut->lut_obd;
1876         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
1877         int wake_up = 0, connected, completed, queue_len;
1878         __u64 req_transno = 0;
1879         __u64 update_transno = 0;
1880         __u64 next_transno = 0;
1881         ENTRY;
1882
1883         spin_lock(&obd->obd_recovery_task_lock);
1884         if (!list_empty(&obd->obd_req_replay_queue)) {
1885                 req = list_entry(obd->obd_req_replay_queue.next,
1886                                      struct ptlrpc_request, rq_list);
1887                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1888         }
1889
1890         if (tdtd != NULL)
1891                 update_transno = distribute_txn_get_next_transno(tdtd);
1892
1893         connected = atomic_read(&obd->obd_connected_clients);
1894         completed = connected - atomic_read(&obd->obd_req_replay_clients);
1895         queue_len = obd->obd_requests_queued_for_recovery;
1896         next_transno = obd->obd_next_recovery_transno;
1897
1898         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1899                "req_transno: %llu, next_transno: %llu\n",
1900                obd->obd_max_recoverable_clients, connected, completed,
1901                queue_len, req_transno, next_transno);
1902
1903         if (obd->obd_abort_recovery) {
1904                 CDEBUG(D_HA, "waking for aborted recovery\n");
1905                 wake_up = 1;
1906         } else if (obd->obd_recovery_expired) {
1907                 CDEBUG(D_HA, "waking for expired recovery\n");
1908                 wake_up = 1;
1909         } else if (tdtd != NULL && req != NULL &&
1910                    is_req_replayed_by_update(req)) {
1911                 LASSERTF(req_transno < next_transno, "req_transno %llu"
1912                          "next_transno%llu\n", req_transno, next_transno);
1913                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
1914                        req_transno);
1915                 wake_up = 1;
1916         } else if (req_transno == next_transno ||
1917                    (update_transno != 0 && update_transno <= next_transno)) {
1918                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
1919                 wake_up = 1;
1920         } else if (queue_len > 0 &&
1921                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1922                 /** handle gaps occured due to lost reply or VBR */
1923                 LASSERTF(req_transno >= next_transno,
1924                          "req_transno: %llu, next_transno: %llu\n",
1925                          req_transno, next_transno);
1926                 CDEBUG(D_HA,
1927                        "%s: waking for gap in transno, VBR is %s (skip: "
1928                        "%lld, ql: %d, comp: %d, conn: %d, next: %lld"
1929                        ", next_update %lld last_committed: %lld)\n",
1930                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1931                        next_transno, queue_len, completed, connected,
1932                        req_transno, update_transno, obd->obd_last_committed);
1933                 obd->obd_next_recovery_transno = req_transno;
1934                 wake_up = 1;
1935         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1936                 CDEBUG(D_HA, "waking for completed recovery\n");
1937                 wake_up = 1;
1938         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1939                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1940                        " by fail_lock, waking up (%lld)\n", next_transno);
1941                 obd->obd_next_recovery_transno = req_transno;
1942                 wake_up = 1;
1943         }
1944         spin_unlock(&obd->obd_recovery_task_lock);
1945         return wake_up;
1946 }
1947
1948 static int check_for_next_lock(struct lu_target *lut)
1949 {
1950         struct obd_device *obd = lut->lut_obd;
1951         int wake_up = 0;
1952
1953         spin_lock(&obd->obd_recovery_task_lock);
1954         if (!list_empty(&obd->obd_lock_replay_queue)) {
1955                 CDEBUG(D_HA, "waking for next lock\n");
1956                 wake_up = 1;
1957         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1958                 CDEBUG(D_HA, "waking for completed lock replay\n");
1959                 wake_up = 1;
1960         } else if (obd->obd_abort_recovery) {
1961                 CDEBUG(D_HA, "waking for aborted recovery\n");
1962                 wake_up = 1;
1963         } else if (obd->obd_recovery_expired) {
1964                 CDEBUG(D_HA, "waking for expired recovery\n");
1965                 wake_up = 1;
1966         }
1967         spin_unlock(&obd->obd_recovery_task_lock);
1968
1969         return wake_up;
1970 }
1971
1972 /**
1973  * wait for recovery events,
1974  * check its status with help of check_routine
1975  * evict dead clients via health_check
1976  */
1977 static int target_recovery_overseer(struct lu_target *lut,
1978                                     int (*check_routine)(struct lu_target *),
1979                                     int (*health_check)(struct obd_export *))
1980 {
1981         struct obd_device       *obd = lut->lut_obd;
1982         struct target_distribute_txn_data *tdtd;
1983         time64_t last = 0;
1984         time64_t now;
1985 repeat:
1986         if (obd->obd_recovering && obd->obd_recovery_start == 0) {
1987                 now = ktime_get_seconds();
1988                 if (now - last > 600) {
1989                         LCONSOLE_INFO("%s: in recovery but waiting for "
1990                                       "the first client to connect\n",
1991                                       obd->obd_name);
1992                         last = now;
1993                 }
1994         }
1995         if (obd->obd_recovery_start != 0 && ktime_get_real_seconds() >=
1996               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
1997                 __u64 next_update_transno = 0;
1998
1999                 /* Only abort the recovery if there are no update recovery
2000                  * left in the queue */
2001                 spin_lock(&obd->obd_recovery_task_lock);
2002                 if (lut->lut_tdtd != NULL) {
2003                         next_update_transno =
2004                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2005
2006                         tdtd = lut->lut_tdtd;
2007                         /* If next_update_transno == 0, it probably because
2008                          * updatelog retrieve threads did not get any records
2009                          * yet, let's wait those threads stopped */
2010                         if (next_update_transno == 0) {
2011                                 struct l_wait_info lwi = { 0 };
2012
2013                                 l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2014                                        atomic_read(
2015                                        &tdtd->tdtd_recovery_threads_count) == 0,
2016                                        &lwi);
2017
2018                                 next_update_transno =
2019                                         distribute_txn_get_next_transno(
2020                                                                 lut->lut_tdtd);
2021                         }
2022                 }
2023
2024                 if (next_update_transno != 0 && !obd->obd_abort_recovery) {
2025                         obd->obd_next_recovery_transno = next_update_transno;
2026                         spin_unlock(&obd->obd_recovery_task_lock);
2027                         /* Disconnect unfinished exports from clients, and
2028                          * keep connection from MDT to make sure the update
2029                          * recovery will still keep trying until some one
2030                          * manually abort the recovery */
2031                         class_disconnect_stale_exports(obd,
2032                                                 exp_finished_or_from_mdt);
2033                         /* Abort all of replay and replay lock req from
2034                          * clients */
2035                         abort_req_replay_queue(obd);
2036                         abort_lock_replay_queue(obd);
2037                         CDEBUG(D_HA, "%s: there are still update replay (%#llx"
2038                                ")in the queue.\n", obd->obd_name,
2039                                next_update_transno);
2040                 } else {
2041                         obd->obd_abort_recovery = 1;
2042                         spin_unlock(&obd->obd_recovery_task_lock);
2043                         CWARN("%s recovery is aborted by hard timeout\n",
2044                               obd->obd_name);
2045                 }
2046         }
2047
2048         while (wait_event_timeout(obd->obd_next_transno_waitq,
2049                                   check_routine(lut),
2050                                   msecs_to_jiffies(60 * MSEC_PER_SEC)) == 0)
2051                 /* wait indefinitely for event, but don't trigger watchdog */;
2052
2053         if (obd->obd_abort_recovery) {
2054                 CWARN("recovery is aborted, evict exports in recovery\n");
2055                 if (lut->lut_tdtd != NULL) {
2056                         struct l_wait_info lwi = { 0 };
2057
2058                         tdtd = lut->lut_tdtd;
2059                         /* Let's wait all of the update log recovery thread
2060                          * finished */
2061                         l_wait_event(tdtd->tdtd_recovery_threads_waitq,
2062                          atomic_read(&tdtd->tdtd_recovery_threads_count) == 0,
2063                              &lwi);
2064                         /* Then abort the update recovery list */
2065                         dtrq_list_destroy(lut->lut_tdtd);
2066                 }
2067
2068                 /** evict exports which didn't finish recovery yet */
2069                 class_disconnect_stale_exports(obd, exp_finished);
2070                 return 1;
2071         } else if (obd->obd_recovery_expired) {
2072                 obd->obd_recovery_expired = 0;
2073                 /** If some clients died being recovered, evict them */
2074                 LCONSOLE_WARN("%s: recovery is timed out, "
2075                               "evict stale exports\n", obd->obd_name);
2076                 /** evict cexports with no replay in queue, they are stalled */
2077                 class_disconnect_stale_exports(obd, health_check);
2078
2079                 /** continue with VBR */
2080                 spin_lock(&obd->obd_dev_lock);
2081                 obd->obd_version_recov = 1;
2082                 spin_unlock(&obd->obd_dev_lock);
2083                 /**
2084                  * reset timer, recovery will proceed with versions now,
2085                  * timeout is set just to handle reconnection delays
2086                  */
2087                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2088                 /** Wait for recovery events again, after evicting bad clients */
2089                 goto repeat;
2090         }
2091         return 0;
2092 }
2093
2094 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2095 {
2096         struct obd_device       *obd = lut->lut_obd;
2097         struct ptlrpc_request *req = NULL;
2098
2099         CDEBUG(D_HA, "Waiting for lock\n");
2100         if (target_recovery_overseer(lut, check_for_next_lock,
2101                                      exp_lock_replay_healthy))
2102                 abort_lock_replay_queue(obd);
2103
2104         spin_lock(&obd->obd_recovery_task_lock);
2105         if (!list_empty(&obd->obd_lock_replay_queue)) {
2106                 req = list_entry(obd->obd_lock_replay_queue.next,
2107                                      struct ptlrpc_request, rq_list);
2108                 list_del_init(&req->rq_list);
2109                 spin_unlock(&obd->obd_recovery_task_lock);
2110         } else {
2111                 spin_unlock(&obd->obd_recovery_task_lock);
2112                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2113                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2114                 /** evict exports failed VBR */
2115                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2116         }
2117         return req;
2118 }
2119
2120 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2121 {
2122         struct ptlrpc_request *req = NULL;
2123
2124         spin_lock(&obd->obd_recovery_task_lock);
2125         if (!list_empty(&obd->obd_final_req_queue)) {
2126                 req = list_entry(obd->obd_final_req_queue.next,
2127                                      struct ptlrpc_request, rq_list);
2128                 list_del_init(&req->rq_list);
2129                 spin_unlock(&obd->obd_recovery_task_lock);
2130                 if (req->rq_export->exp_in_recovery) {
2131                         spin_lock(&req->rq_export->exp_lock);
2132                         req->rq_export->exp_in_recovery = 0;
2133                         spin_unlock(&req->rq_export->exp_lock);
2134                 }
2135         } else {
2136                 spin_unlock(&obd->obd_recovery_task_lock);
2137         }
2138         return req;
2139 }
2140
2141 static void handle_recovery_req(struct ptlrpc_thread *thread,
2142                                 struct ptlrpc_request *req,
2143                                 svc_handler_t handler)
2144 {
2145         ENTRY;
2146
2147         /**
2148          * export can be evicted during recovery, no need to handle replays for
2149          * it after that, discard such request silently
2150          */
2151         if (req->rq_export->exp_disconnected)
2152                 RETURN_EXIT;
2153
2154         req->rq_session.lc_thread = thread;
2155         req->rq_svc_thread = thread;
2156         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2157
2158         /* thread context */
2159         lu_context_enter(&thread->t_env->le_ctx);
2160         (void)handler(req);
2161         lu_context_exit(&thread->t_env->le_ctx);
2162
2163         /* don't reset timer for final stage */
2164         if (!exp_finished(req->rq_export)) {
2165                 time_t to = obd_timeout;
2166
2167                 /**
2168                  * Add request timeout to the recovery time so next request from
2169                  * this client may come in recovery time
2170                  */
2171                 if (!AT_OFF) {
2172                         struct ptlrpc_service_part *svcpt;
2173
2174                         svcpt = req->rq_rqbd->rqbd_svcpt;
2175                         /* If the server sent early reply for this request,
2176                          * the client will recalculate the timeout according to
2177                          * current server estimate service time, so we will
2178                          * use the maxium timeout here for waiting the client
2179                          * sending the next req
2180                          */
2181                         to = max_t(time_t, at_est2timeout(at_get(&svcpt->scp_at_estimate)),
2182                                    lustre_msg_get_timeout(req->rq_reqmsg));
2183                         /* Add 2 net_latency, one for balance rq_deadline
2184                          * (see ptl_send_rpc), one for resend the req to server,
2185                          * Note: client will pack net_latency in replay req
2186                          * (see ptlrpc_replay_req) */
2187                         to += 2 * lustre_msg_get_service_time(req->rq_reqmsg);
2188                 }
2189                 extend_recovery_timer(class_exp2obd(req->rq_export), to, true);
2190         }
2191         EXIT;
2192 }
2193
2194 /** Checking routines for recovery */
2195 static int check_for_recovery_ready(struct lu_target *lut)
2196 {
2197         struct obd_device *obd = lut->lut_obd;
2198         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2199
2200         CDEBUG(D_HA, "connected %d stale %d max_recoverable_clients %d"
2201                " abort %d expired %d\n", clnts, obd->obd_stale_clients,
2202                obd->obd_max_recoverable_clients, obd->obd_abort_recovery,
2203                obd->obd_recovery_expired);
2204
2205         if (!obd->obd_abort_recovery && !obd->obd_recovery_expired) {
2206                 LASSERT(clnts <= obd->obd_max_recoverable_clients);
2207                 if (clnts + obd->obd_stale_clients <
2208                     obd->obd_max_recoverable_clients)
2209                         return 0;
2210         }
2211
2212         if (lut->lut_tdtd != NULL) {
2213                 if (!lut->lut_tdtd->tdtd_replay_ready &&
2214                     !obd->obd_abort_recovery) {
2215                         /* Let's extend recovery timer, in case the recovery
2216                          * timer expired, and some clients got evicted */
2217                         extend_recovery_timer(obd, obd->obd_recovery_timeout,
2218                                               true);
2219                         CDEBUG(D_HA, "%s update recovery is not ready, extend recovery %llu\n",
2220                                obd->obd_name, obd->obd_recovery_timeout);
2221                         return 0;
2222                 }
2223         }
2224
2225         return 1;
2226 }
2227
2228 enum {
2229         REQUEST_RECOVERY = 1,
2230         UPDATE_RECOVERY = 2,
2231 };
2232
2233 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2234 {
2235         __u64 transno = 0;
2236
2237         if (!list_empty(&obd->obd_req_replay_queue)) {
2238                 struct ptlrpc_request *req;
2239
2240                 req = list_entry(obd->obd_req_replay_queue.next,
2241                                  struct ptlrpc_request, rq_list);
2242                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2243         }
2244
2245         return transno;
2246 }
2247
2248 static __u64 get_next_transno(struct lu_target *lut, int *type)
2249 {
2250         struct obd_device *obd = lut->lut_obd;
2251         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2252         __u64 transno = 0;
2253         __u64 update_transno;
2254         ENTRY;
2255
2256         transno = get_next_replay_req_transno(obd);
2257         if (type != NULL)
2258                 *type = REQUEST_RECOVERY;
2259
2260         if (tdtd == NULL)
2261                 RETURN(transno);
2262
2263         update_transno = distribute_txn_get_next_transno(tdtd);
2264         if (transno == 0 || (transno >= update_transno &&
2265                              update_transno != 0)) {
2266                 transno = update_transno;
2267                 if (type != NULL)
2268                         *type = UPDATE_RECOVERY;
2269         }
2270
2271         RETURN(transno);
2272 }
2273
2274 /**
2275  * drop duplicate replay request
2276  *
2277  * Because the operation has been replayed by update recovery, the request
2278  * with the same transno will be dropped and also notify the client to send
2279  * next replay request.
2280  *
2281  * \param[in] env       execution environment
2282  * \param[in] obd       failover obd device
2283  * \param[in] req       request to be dropped
2284  */
2285 static void drop_duplicate_replay_req(struct lu_env *env,
2286                                       struct obd_device *obd,
2287                                       struct ptlrpc_request *req)
2288 {
2289         DEBUG_REQ(D_HA, req, "remove t%lld from %s because of duplicate"
2290                   " update records are found.\n",
2291                   lustre_msg_get_transno(req->rq_reqmsg),
2292                   libcfs_nid2str(req->rq_peer.nid));
2293
2294         /* Right now, only for MDS reint operation update replay and
2295          * normal request replay can have the same transno */
2296         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT) {
2297                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2298                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2299                 if (likely(req->rq_export))
2300                         target_committed_to_req(req);
2301                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2302                 target_send_reply(req, req->rq_status, 0);
2303         } else {
2304                 DEBUG_REQ(D_ERROR, req, "wrong opc" "from %s\n",
2305                 libcfs_nid2str(req->rq_peer.nid));
2306         }
2307         target_exp_dequeue_req_replay(req);
2308         target_request_copy_put(req);
2309         obd->obd_replayed_requests++;
2310 }
2311
2312 static void replay_request_or_update(struct lu_env *env,
2313                                      struct lu_target *lut,
2314                                      struct target_recovery_data *trd,
2315                                      struct ptlrpc_thread *thread)
2316 {
2317         struct obd_device *obd = lut->lut_obd;
2318         struct ptlrpc_request *req = NULL;
2319         int                     type;
2320         __u64                   transno;
2321         ENTRY;
2322
2323         CDEBUG(D_HA, "Waiting for transno %lld\n",
2324                obd->obd_next_recovery_transno);
2325
2326         /* Replay all of request and update by transno */
2327         do {
2328                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2329
2330                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2331
2332                 /** It is needed to extend recovery window above
2333                  *  recovery_time_soft. Extending is possible only in the
2334                  *  end of recovery window (see more details in
2335                  *  handle_recovery_req()).
2336                  */
2337                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2338
2339                 if (target_recovery_overseer(lut, check_for_next_transno,
2340                                         exp_req_replay_healthy_or_from_mdt)) {
2341                         abort_req_replay_queue(obd);
2342                         abort_lock_replay_queue(obd);
2343                         goto abort;
2344                 }
2345
2346                 spin_lock(&obd->obd_recovery_task_lock);
2347                 transno = get_next_transno(lut, &type);
2348                 if (type == REQUEST_RECOVERY && transno != 0) {
2349                         /* Drop replay request from client side, if the
2350                          * replay has been executed by update with the
2351                          * same transno */
2352                         req = list_entry(obd->obd_req_replay_queue.next,
2353                                         struct ptlrpc_request, rq_list);
2354
2355                         list_del_init(&req->rq_list);
2356                         obd->obd_requests_queued_for_recovery--;
2357                         spin_unlock(&obd->obd_recovery_task_lock);
2358
2359                         /* Let's check if the request has been redone by
2360                          * update replay */
2361                         if (is_req_replayed_by_update(req)) {
2362                                 struct distribute_txn_replay_req *dtrq;
2363
2364                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2365                                                                    req->rq_xid);
2366                                 LASSERT(dtrq != NULL);
2367                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2368                                 list_del_init(&dtrq->dtrq_list);
2369                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2370                                 dtrq_destroy(dtrq);
2371
2372                                 drop_duplicate_replay_req(env, obd, req);
2373
2374                                 continue;
2375                         }
2376
2377                         LASSERT(trd->trd_processing_task == current_pid());
2378                         DEBUG_REQ(D_HA, req, "processing t%lld from %s",
2379                                   lustre_msg_get_transno(req->rq_reqmsg),
2380                                   libcfs_nid2str(req->rq_peer.nid));
2381
2382                         handle_recovery_req(thread, req,
2383                                             trd->trd_recovery_handler);
2384                         /**
2385                          * bz18031: increase next_recovery_transno before
2386                          * target_request_copy_put() will drop exp_rpc reference
2387                          */
2388                         spin_lock(&obd->obd_recovery_task_lock);
2389                         obd->obd_next_recovery_transno++;
2390                         spin_unlock(&obd->obd_recovery_task_lock);
2391                         target_exp_dequeue_req_replay(req);
2392                         target_request_copy_put(req);
2393                         obd->obd_replayed_requests++;
2394                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2395                         struct distribute_txn_replay_req *dtrq;
2396                         int rc;
2397
2398                         spin_unlock(&obd->obd_recovery_task_lock);
2399
2400                         LASSERT(tdtd != NULL);
2401                         dtrq = distribute_txn_get_next_req(tdtd);
2402                         lu_context_enter(&thread->t_env->le_ctx);
2403                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2404                         lu_context_exit(&thread->t_env->le_ctx);
2405                         extend_recovery_timer(obd, obd_timeout, true);
2406
2407                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2408                                 CDEBUG(D_HA, "Move x%llu t%llu"
2409                                        " to finish list\n", dtrq->dtrq_xid,
2410                                        dtrq->dtrq_master_transno);
2411
2412                                 /* Add it to the replay finish list */
2413                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2414                                 list_add(&dtrq->dtrq_list,
2415                                          &tdtd->tdtd_replay_finish_list);
2416                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2417
2418                                 spin_lock(&obd->obd_recovery_task_lock);
2419                                 if (transno == obd->obd_next_recovery_transno)
2420                                         obd->obd_next_recovery_transno++;
2421                                 else if (transno >
2422                                          obd->obd_next_recovery_transno)
2423                                         obd->obd_next_recovery_transno =
2424                                                                 transno + 1;
2425                                 spin_unlock(&obd->obd_recovery_task_lock);
2426                         } else {
2427                                 dtrq_destroy(dtrq);
2428                         }
2429                 } else {
2430                         spin_unlock(&obd->obd_recovery_task_lock);
2431 abort:
2432                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2433                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2434                         /** evict exports failed VBR */
2435                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2436                         break;
2437                 }
2438         } while (1);
2439 }
2440
2441 static int target_recovery_thread(void *arg)
2442 {
2443         struct lu_target *lut = arg;
2444         struct obd_device *obd = lut->lut_obd;
2445         struct ptlrpc_request *req;
2446         struct target_recovery_data *trd = &obd->obd_recovery_data;
2447         unsigned long delta;
2448         struct lu_env *env;
2449         struct ptlrpc_thread *thread = NULL;
2450         int rc = 0;
2451         ENTRY;
2452
2453         unshare_fs_struct();
2454         OBD_ALLOC_PTR(thread);
2455         if (thread == NULL)
2456                 RETURN(-ENOMEM);
2457
2458         OBD_ALLOC_PTR(env);
2459         if (env == NULL) {
2460                 OBD_FREE_PTR(thread);
2461                 RETURN(-ENOMEM);
2462         }
2463
2464         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2465         if (rc) {
2466                 OBD_FREE_PTR(thread);
2467                 OBD_FREE_PTR(env);
2468                 RETURN(rc);
2469         }
2470
2471         thread->t_env = env;
2472         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2473         env->le_ctx.lc_thread = thread;
2474         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2475
2476         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2477                current_pid());
2478         trd->trd_processing_task = current_pid();
2479
2480         spin_lock(&obd->obd_dev_lock);
2481         obd->obd_recovering = 1;
2482         spin_unlock(&obd->obd_dev_lock);
2483         complete(&trd->trd_starting);
2484
2485         /* first of all, we have to know the first transno to replay */
2486         if (target_recovery_overseer(lut, check_for_recovery_ready,
2487                                      exp_connect_healthy)) {
2488                 abort_req_replay_queue(obd);
2489                 abort_lock_replay_queue(obd);
2490                 if (lut->lut_tdtd != NULL)
2491                         dtrq_list_destroy(lut->lut_tdtd);
2492         }
2493
2494         /* next stage: replay requests or update */
2495         delta = jiffies;
2496         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2497                atomic_read(&obd->obd_req_replay_clients),
2498                obd->obd_next_recovery_transno);
2499         replay_request_or_update(env, lut, trd, thread);
2500
2501         /**
2502          * The second stage: replay locks
2503          */
2504         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2505                atomic_read(&obd->obd_lock_replay_clients));
2506         while ((req = target_next_replay_lock(lut))) {
2507                 LASSERT(trd->trd_processing_task == current_pid());
2508                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
2509                           libcfs_nid2str(req->rq_peer.nid));
2510                 handle_recovery_req(thread, req,
2511                                     trd->trd_recovery_handler);
2512                 target_request_copy_put(req);
2513                 obd->obd_replayed_locks++;
2514         }
2515
2516         /**
2517          * The third stage: reply on final pings, at this moment all clients
2518          * must have request in final queue
2519          */
2520         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2521         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2522         /** Update server last boot epoch */
2523         tgt_boot_epoch_update(lut);
2524         /* We drop recoverying flag to forward all new requests
2525          * to regular mds_handle() since now */
2526         spin_lock(&obd->obd_dev_lock);
2527         obd->obd_recovering = obd->obd_abort_recovery = 0;
2528         spin_unlock(&obd->obd_dev_lock);
2529         spin_lock(&obd->obd_recovery_task_lock);
2530         target_cancel_recovery_timer(obd);
2531         spin_unlock(&obd->obd_recovery_task_lock);
2532         while ((req = target_next_final_ping(obd))) {
2533                 LASSERT(trd->trd_processing_task == current_pid());
2534                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
2535                           libcfs_nid2str(req->rq_peer.nid));
2536                 handle_recovery_req(thread, req,
2537                                     trd->trd_recovery_handler);
2538                 /* Because the waiting client can not send ping to server,
2539                  * so we need refresh the last_request_time, to avoid the
2540                  * export is being evicted */
2541                 ptlrpc_update_export_timer(req->rq_export, 0);
2542                 target_request_copy_put(req);
2543         }
2544
2545         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2546         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
2547               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2548         if (delta > OBD_RECOVERY_TIME_SOFT) {
2549                 CWARN("too long recovery - read logs\n");
2550                 libcfs_debug_dumplog();
2551         }
2552
2553         target_finish_recovery(lut);
2554
2555         lu_context_fini(&env->le_ctx);
2556         trd->trd_processing_task = 0;
2557         complete(&trd->trd_finishing);
2558
2559         tgt_io_thread_done(thread);
2560         OBD_FREE_PTR(thread);
2561         OBD_FREE_PTR(env);
2562         RETURN(rc);
2563 }
2564
2565 static int target_start_recovery_thread(struct lu_target *lut,
2566                                         svc_handler_t handler)
2567 {
2568         struct obd_device *obd = lut->lut_obd;
2569         int rc = 0;
2570         struct target_recovery_data *trd = &obd->obd_recovery_data;
2571         int index;
2572
2573         memset(trd, 0, sizeof(*trd));
2574         init_completion(&trd->trd_starting);
2575         init_completion(&trd->trd_finishing);
2576         trd->trd_recovery_handler = handler;
2577
2578         rc = server_name2index(obd->obd_name, &index, NULL);
2579         if (rc < 0)
2580                 return rc;
2581
2582         if (!IS_ERR(kthread_run(target_recovery_thread,
2583                                 lut, "tgt_recover_%d", index))) {
2584                 wait_for_completion(&trd->trd_starting);
2585                 LASSERT(obd->obd_recovering != 0);
2586         } else {
2587                 rc = -ECHILD;
2588         }
2589
2590         return rc;
2591 }
2592
2593 void target_stop_recovery_thread(struct obd_device *obd)
2594 {
2595         if (obd->obd_recovery_data.trd_processing_task > 0) {
2596                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2597                 /** recovery can be done but postrecovery is not yet */
2598                 spin_lock(&obd->obd_dev_lock);
2599                 if (obd->obd_recovering) {
2600                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2601                         obd->obd_abort_recovery = 1;
2602                         wake_up(&obd->obd_next_transno_waitq);
2603                 }
2604                 spin_unlock(&obd->obd_dev_lock);
2605                 wait_for_completion(&trd->trd_finishing);
2606         }
2607 }
2608 EXPORT_SYMBOL(target_stop_recovery_thread);
2609
2610 void target_recovery_fini(struct obd_device *obd)
2611 {
2612         class_disconnect_exports(obd);
2613         target_stop_recovery_thread(obd);
2614         target_cleanup_recovery(obd);
2615 }
2616 EXPORT_SYMBOL(target_recovery_fini);
2617
2618 static enum hrtimer_restart target_recovery_expired(struct hrtimer *timer)
2619 {
2620         struct obd_device *obd = container_of(timer, struct obd_device,
2621                                               obd_recovery_timer);
2622
2623         CDEBUG(D_HA,
2624                "%s: recovery timed out; %d clients are still in recovery after %llu seconds (%d clients connected)\n",
2625                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2626                ktime_get_real_seconds() - obd->obd_recovery_start,
2627                atomic_read(&obd->obd_connected_clients));
2628
2629         obd->obd_recovery_expired = 1;
2630         wake_up(&obd->obd_next_transno_waitq);
2631         return HRTIMER_NORESTART;
2632 }
2633
2634 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2635 {
2636         struct obd_device *obd = lut->lut_obd;
2637
2638         if (lut->lut_bottom->dd_rdonly)
2639                 return;
2640
2641         if (obd->obd_max_recoverable_clients == 0) {
2642                 /** Update server last boot epoch */
2643                 tgt_boot_epoch_update(lut);
2644                 return;
2645         }
2646
2647         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2648                "last_transno %llu\n", obd->obd_name,
2649                obd->obd_max_recoverable_clients, obd->obd_last_committed);
2650         LASSERT(obd->obd_stopping == 0);
2651         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2652         obd->obd_recovery_start = 0;
2653         obd->obd_recovery_end = 0;
2654
2655         hrtimer_init(&obd->obd_recovery_timer, CLOCK_REALTIME,
2656                      HRTIMER_MODE_REL);
2657         obd->obd_recovery_timer.function = &target_recovery_expired;
2658         target_start_recovery_thread(lut, handler);
2659 }
2660 EXPORT_SYMBOL(target_recovery_init);
2661
2662 static int target_process_req_flags(struct obd_device *obd,
2663                                     struct ptlrpc_request *req)
2664 {
2665         struct obd_export *exp = req->rq_export;
2666         LASSERT(exp != NULL);
2667         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2668                 /* client declares he's ready to replay locks */
2669                 spin_lock(&exp->exp_lock);
2670                 if (exp->exp_req_replay_needed) {
2671                         exp->exp_req_replay_needed = 0;
2672                         spin_unlock(&exp->exp_lock);
2673
2674                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2675                         atomic_dec(&obd->obd_req_replay_clients);
2676                 } else {
2677                         spin_unlock(&exp->exp_lock);
2678                 }
2679         }
2680         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2681                 /* client declares he's ready to complete recovery
2682                  * so, we put the request on th final queue */
2683                 spin_lock(&exp->exp_lock);
2684                 if (exp->exp_lock_replay_needed) {
2685                         exp->exp_lock_replay_needed = 0;
2686                         spin_unlock(&exp->exp_lock);
2687
2688                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
2689                         atomic_dec(&obd->obd_lock_replay_clients);
2690                 } else {
2691                         spin_unlock(&exp->exp_lock);
2692                 }
2693         }
2694         return 0;
2695 }
2696
2697 int target_queue_recovery_request(struct ptlrpc_request *req,
2698                                   struct obd_device *obd)
2699 {
2700         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
2701         struct ptlrpc_request *reqiter;
2702         int inserted = 0;
2703         ENTRY;
2704
2705         if (obd->obd_recovery_data.trd_processing_task == current_pid()) {
2706                 /* Processing the queue right now, don't re-add. */
2707                 RETURN(1);
2708         }
2709
2710         target_process_req_flags(obd, req);
2711
2712         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2713                 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
2714                         if (cfs_fail_val == 1) {
2715                                 cfs_race_state = 1;
2716                                 cfs_fail_val = 0;
2717                                 wake_up(&cfs_race_waitq);
2718
2719                                 set_current_state(TASK_INTERRUPTIBLE);
2720                                 schedule_timeout(cfs_time_seconds(1));
2721                         }
2722                 }
2723
2724                 /* client declares he's ready to complete recovery
2725                  * so, we put the request on th final queue */
2726                 target_request_copy_get(req);
2727                 DEBUG_REQ(D_HA, req, "queue final req");
2728                 wake_up(&obd->obd_next_transno_waitq);
2729                 spin_lock(&obd->obd_recovery_task_lock);
2730                 if (obd->obd_recovering) {
2731                         struct ptlrpc_request *tmp;
2732                         struct ptlrpc_request *duplicate = NULL;
2733
2734                         if (likely(!req->rq_export->exp_replay_done)) {
2735                                 req->rq_export->exp_replay_done = 1;
2736                                 list_add_tail(&req->rq_list,
2737                                               &obd->obd_final_req_queue);
2738                                 spin_unlock(&obd->obd_recovery_task_lock);
2739                                 RETURN(0);
2740                         }
2741
2742                         /* XXX O(n), but only happens if final ping is
2743                          * timed out, probably reorganize the list as
2744                          * a hash list later */
2745                         list_for_each_entry_safe(reqiter, tmp,
2746                                                  &obd->obd_final_req_queue,
2747                                                  rq_list) {
2748                                 if (reqiter->rq_export == req->rq_export) {
2749                                         list_del_init(&reqiter->rq_list);
2750                                         duplicate = reqiter;
2751                                         break;
2752                                 }
2753                         }
2754
2755                         list_add_tail(&req->rq_list,
2756                                       &obd->obd_final_req_queue);
2757                         req->rq_export->exp_replay_done = 1;
2758                         spin_unlock(&obd->obd_recovery_task_lock);
2759
2760                         if (duplicate != NULL) {
2761                                 DEBUG_REQ(D_HA, duplicate,
2762                                           "put prev final req\n");
2763                                 target_request_copy_put(duplicate);
2764                         }
2765                         RETURN(0);
2766                 } else {
2767                         spin_unlock(&obd->obd_recovery_task_lock);
2768                         target_request_copy_put(req);
2769                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
2770                 }
2771         }
2772         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2773                 /* client declares he's ready to replay locks */
2774                 target_request_copy_get(req);
2775                 DEBUG_REQ(D_HA, req, "queue lock replay req");
2776                 wake_up(&obd->obd_next_transno_waitq);
2777                 spin_lock(&obd->obd_recovery_task_lock);
2778                 LASSERT(obd->obd_recovering);
2779                 /* usually due to recovery abort */
2780                 if (!req->rq_export->exp_in_recovery) {
2781                         spin_unlock(&obd->obd_recovery_task_lock);
2782                         target_request_copy_put(req);
2783                         RETURN(-ENOTCONN);
2784                 }
2785                 LASSERT(req->rq_export->exp_lock_replay_needed);
2786                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
2787                 spin_unlock(&obd->obd_recovery_task_lock);
2788                 RETURN(0);
2789         }
2790
2791         /* CAVEAT EMPTOR: The incoming request message has been swabbed
2792          * (i.e. buflens etc are in my own byte order), but type-dependent
2793          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed. */
2794
2795         if (!transno) {
2796                 INIT_LIST_HEAD(&req->rq_list);
2797                 DEBUG_REQ(D_HA, req, "not queueing");
2798                 RETURN(1);
2799         }
2800
2801         /* If we're processing the queue, we want don't want to queue this
2802          * message.
2803          *
2804          * Also, if this request has a transno less than the one we're waiting
2805          * for, we should process it now.  It could (and currently always will)
2806          * be an open request for a descriptor that was opened some time ago.
2807          *
2808          * Also, a resent, replayed request that has already been
2809          * handled will pass through here and be processed immediately.
2810          */
2811         CDEBUG(D_HA, "Next recovery transno: %llu"
2812                ", current: %llu, replaying\n",
2813                obd->obd_next_recovery_transno, transno);
2814
2815         /* If the request has been replayed by update replay, then sends this
2816          * request to the recovery thread (replay_request_or_update()), where
2817          * it will be handled */
2818         spin_lock(&obd->obd_recovery_task_lock);
2819         if (transno < obd->obd_next_recovery_transno &&
2820             !is_req_replayed_by_update(req)) {
2821                 /* Processing the queue right now, don't re-add. */
2822                 LASSERT(list_empty(&req->rq_list));
2823                 spin_unlock(&obd->obd_recovery_task_lock);
2824                 RETURN(1);
2825         }
2826         spin_unlock(&obd->obd_recovery_task_lock);
2827
2828         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2829                 RETURN(0);
2830
2831         target_request_copy_get(req);
2832         if (!req->rq_export->exp_in_recovery) {
2833                 target_request_copy_put(req);
2834                 RETURN(-ENOTCONN);
2835         }
2836         LASSERT(req->rq_export->exp_req_replay_needed);
2837
2838         if (target_exp_enqueue_req_replay(req)) {
2839                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2840                 target_request_copy_put(req);
2841                 RETURN(0);
2842         }
2843
2844         /* XXX O(n^2) */
2845         spin_lock(&obd->obd_recovery_task_lock);
2846         LASSERT(obd->obd_recovering);
2847         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
2848                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2849                         list_add_tail(&req->rq_list, &reqiter->rq_list);
2850                         inserted = 1;
2851                         goto added;
2852                 }
2853
2854                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2855                              transno)) {
2856                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2857                                   "has been claimed by another client");
2858                         spin_unlock(&obd->obd_recovery_task_lock);
2859                         target_exp_dequeue_req_replay(req);
2860                         target_request_copy_put(req);
2861                         RETURN(0);
2862                 }
2863         }
2864 added:
2865         if (!inserted)
2866                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2867
2868         obd->obd_requests_queued_for_recovery++;
2869         spin_unlock(&obd->obd_recovery_task_lock);
2870         wake_up(&obd->obd_next_transno_waitq);
2871         RETURN(0);
2872 }
2873
2874 void target_committed_to_req(struct ptlrpc_request *req)
2875 {
2876         struct obd_export *exp = req->rq_export;
2877
2878         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2879                 lustre_msg_set_last_committed(req->rq_repmsg,
2880                                               exp->exp_last_committed);
2881         else
2882                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2883                           "%d)", exp->exp_obd->obd_no_transno,
2884                           req->rq_repmsg == NULL);
2885
2886         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
2887                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2888 }
2889
2890 #endif /* HAVE_SERVER_SUPPORT */
2891
2892 /**
2893  * Packs current SLV and Limit into \a req.
2894  */
2895 int target_pack_pool_reply(struct ptlrpc_request *req)
2896 {
2897         struct obd_device *obd;
2898         ENTRY;
2899
2900         /* Check that we still have all structures alive as this may
2901          * be some late RPC at shutdown time. */
2902         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2903                      !exp_connect_lru_resize(req->rq_export))) {
2904                 lustre_msg_set_slv(req->rq_repmsg, 0);
2905                 lustre_msg_set_limit(req->rq_repmsg, 0);
2906                 RETURN(0);
2907         }
2908
2909         /* OBD is alive here as export is alive, which we checked above. */
2910         obd = req->rq_export->exp_obd;
2911
2912         read_lock(&obd->obd_pool_lock);
2913         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2914         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2915         read_unlock(&obd->obd_pool_lock);
2916
2917         RETURN(0);
2918 }
2919
2920 static int target_send_reply_msg(struct ptlrpc_request *req,
2921                                  int rc, int fail_id)
2922 {
2923         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2924                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2925                 return -ECOMM;
2926         }
2927         /* We can have a null rq_reqmsg in the event of bad signature or
2928          * no context when unwrapping */
2929         if (req->rq_reqmsg &&
2930             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
2931             OBD_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
2932                 return -ECOMM;
2933
2934         if (unlikely(rc)) {
2935                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
2936                 req->rq_status = rc;
2937                 return ptlrpc_send_error(req, 1);
2938         } else {
2939                 DEBUG_REQ(D_NET, req, "sending reply");
2940         }
2941
2942         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
2943 }
2944
2945 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2946 {
2947         struct ptlrpc_service_part *svcpt;
2948         int                        netrc;
2949         struct ptlrpc_reply_state *rs;
2950         struct obd_export         *exp;
2951         ENTRY;
2952
2953         if (req->rq_no_reply) {
2954                 EXIT;
2955                 return;
2956         }
2957
2958         svcpt = req->rq_rqbd->rqbd_svcpt;
2959         rs = req->rq_reply_state;
2960         if (rs == NULL || !rs->rs_difficult) {
2961                 /* no notifiers */
2962                 target_send_reply_msg (req, rc, fail_id);
2963                 EXIT;
2964                 return;
2965         }
2966
2967         /* must be an export if locks saved */
2968         LASSERT(req->rq_export != NULL);
2969         /* req/reply consistent */
2970         LASSERT(rs->rs_svcpt == svcpt);
2971
2972         /* "fresh" reply */
2973         LASSERT(!rs->rs_scheduled);
2974         LASSERT(!rs->rs_scheduled_ever);
2975         LASSERT(!rs->rs_handled);
2976         LASSERT(!rs->rs_on_net);
2977         LASSERT(rs->rs_export == NULL);
2978         LASSERT(list_empty(&rs->rs_obd_list));
2979         LASSERT(list_empty(&rs->rs_exp_list));
2980
2981         exp = class_export_get(req->rq_export);
2982
2983         /* disable reply scheduling while I'm setting up */
2984         rs->rs_scheduled = 1;
2985         rs->rs_on_net    = 1;
2986         rs->rs_xid       = req->rq_xid;
2987         rs->rs_transno   = req->rq_transno;
2988         rs->rs_export    = exp;
2989         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
2990
2991         spin_lock(&exp->exp_uncommitted_replies_lock);
2992         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
2993                rs->rs_transno, exp->exp_last_committed);
2994         if (rs->rs_transno > exp->exp_last_committed) {
2995                 /* not committed already */
2996                 list_add_tail(&rs->rs_obd_list,
2997                                   &exp->exp_uncommitted_replies);
2998         }
2999         spin_unlock(&exp->exp_uncommitted_replies_lock);
3000
3001         spin_lock(&exp->exp_lock);
3002         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
3003         spin_unlock(&exp->exp_lock);
3004
3005         netrc = target_send_reply_msg(req, rc, fail_id);
3006
3007         spin_lock(&svcpt->scp_rep_lock);
3008
3009         atomic_inc(&svcpt->scp_nreps_difficult);
3010
3011         if (netrc != 0) {
3012                 /* error sending: reply is off the net.  Also we need +1
3013                  * reply ref until ptlrpc_handle_rs() is done
3014                  * with the reply state (if the send was successful, there
3015                  * would have been +1 ref for the net, which
3016                  * reply_out_callback leaves alone) */
3017                 rs->rs_on_net = 0;
3018                 ptlrpc_rs_addref(rs);
3019         }
3020
3021         spin_lock(&rs->rs_lock);
3022         if (rs->rs_transno <= exp->exp_last_committed ||
3023             (!rs->rs_on_net && !rs->rs_no_ack) ||
3024             list_empty(&rs->rs_exp_list) ||     /* completed already */
3025             list_empty(&rs->rs_obd_list)) {
3026                 CDEBUG(D_HA, "Schedule reply immediately\n");
3027                 ptlrpc_dispatch_difficult_reply(rs);
3028         } else {
3029                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
3030                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
3031         }
3032         spin_unlock(&rs->rs_lock);
3033         spin_unlock(&svcpt->scp_rep_lock);
3034         EXIT;
3035 }
3036
3037 enum ldlm_mode lck_compat_array[] = {
3038         [LCK_EX]    = LCK_COMPAT_EX,
3039         [LCK_PW]    = LCK_COMPAT_PW,
3040         [LCK_PR]    = LCK_COMPAT_PR,
3041         [LCK_CW]    = LCK_COMPAT_CW,
3042         [LCK_CR]    = LCK_COMPAT_CR,
3043         [LCK_NL]    = LCK_COMPAT_NL,
3044         [LCK_GROUP] = LCK_COMPAT_GROUP,
3045         [LCK_COS]   = LCK_COMPAT_COS,
3046 };
3047
3048 /**
3049  * Rather arbitrary mapping from LDLM error codes to errno values. This should
3050  * not escape to the user level.
3051  */
3052 int ldlm_error2errno(enum ldlm_error error)
3053 {
3054         int result;
3055
3056         switch (error) {
3057         case ELDLM_OK:
3058         case ELDLM_LOCK_MATCHED:
3059                 result = 0;
3060                 break;
3061         case ELDLM_LOCK_CHANGED:
3062                 result = -ESTALE;
3063                 break;
3064         case ELDLM_LOCK_ABORTED:
3065                 result = -ENAVAIL;
3066                 break;
3067         case ELDLM_LOCK_REPLACED:
3068                 result = -ESRCH;
3069                 break;
3070         case ELDLM_NO_LOCK_DATA:
3071                 result = -ENOENT;
3072                 break;
3073         case ELDLM_NAMESPACE_EXISTS:
3074                 result = -EEXIST;
3075                 break;
3076         case ELDLM_BAD_NAMESPACE:
3077                 result = -EBADF;
3078                 break;
3079         default:
3080                 if (((int)error) < 0) { /* cast to signed type */
3081                         result = error; /* as ldlm_error can be unsigned */
3082                 } else {
3083                         CERROR("Invalid DLM result code: %d\n", error);
3084                         result = -EPROTO;
3085                 }
3086         }
3087         return result;
3088 }
3089 EXPORT_SYMBOL(ldlm_error2errno);
3090
3091 /**
3092  * Dual to ldlm_error2errno(): maps errno values back to enum ldlm_error.
3093  */
3094 enum ldlm_error ldlm_errno2error(int err_no)
3095 {
3096         int error;
3097
3098         switch (err_no) {
3099         case 0:
3100                 error = ELDLM_OK;
3101                 break;
3102         case -ESTALE:
3103                 error = ELDLM_LOCK_CHANGED;
3104                 break;
3105         case -ENAVAIL:
3106                 error = ELDLM_LOCK_ABORTED;
3107                 break;
3108         case -ESRCH:
3109                 error = ELDLM_LOCK_REPLACED;
3110                 break;
3111         case -ENOENT:
3112                 error = ELDLM_NO_LOCK_DATA;
3113                 break;
3114         case -EEXIST:
3115                 error = ELDLM_NAMESPACE_EXISTS;
3116                 break;
3117         case -EBADF:
3118                 error = ELDLM_BAD_NAMESPACE;
3119                 break;
3120         default:
3121                 error = err_no;
3122         }
3123         return error;
3124 }
3125
3126 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3127 void ldlm_dump_export_locks(struct obd_export *exp)
3128 {
3129         spin_lock(&exp->exp_locks_list_guard);
3130         if (!list_empty(&exp->exp_locks_list)) {
3131                 struct ldlm_lock *lock;
3132
3133                 CERROR("dumping locks for export %p,"
3134                        "ignore if the unmount doesn't hang\n", exp);
3135                 list_for_each_entry(lock, &exp->exp_locks_list,
3136                                         l_exp_refs_link)
3137                         LDLM_ERROR(lock, "lock:");
3138         }
3139         spin_unlock(&exp->exp_locks_list_guard);
3140 }
3141 #endif
3142
3143 #ifdef HAVE_SERVER_SUPPORT
3144 static int target_bulk_timeout(void *data)
3145 {
3146         ENTRY;
3147         /* We don't fail the connection here, because having the export
3148          * killed makes the (vital) call to commitrw very sad.
3149          */
3150         RETURN(1);
3151 }
3152
3153 static inline const char *bulk2type(struct ptlrpc_request *req)
3154 {
3155         if (req->rq_bulk_read)
3156                 return "READ";
3157         if (req->rq_bulk_write)
3158                 return "WRITE";
3159         return "UNKNOWN";
3160 }
3161
3162 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc,
3163                    struct l_wait_info *lwi)
3164 {
3165         struct ptlrpc_request *req = desc->bd_req;
3166         time64_t start = ktime_get_real_seconds();
3167         time64_t deadline;
3168         int rc = 0;
3169
3170         ENTRY;
3171
3172         /* If there is eviction in progress, wait for it to finish. */
3173         if (unlikely(atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
3174                 *lwi = LWI_INTR(NULL, NULL);
3175                 rc = l_wait_event(exp->exp_obd->obd_evict_inprogress_waitq,
3176                                   !atomic_read(&exp->exp_obd->
3177                                                    obd_evict_inprogress),
3178                                   lwi);
3179         }
3180
3181         /* Check if client was evicted or reconnected already. */
3182         if (exp->exp_failed ||
3183             exp->exp_conn_cnt > lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3184                 rc = -ENOTCONN;
3185         } else {
3186                 if (req->rq_bulk_read)
3187                         rc = sptlrpc_svc_wrap_bulk(req, desc);
3188
3189                 if (OCD_HAS_FLAG(&exp->exp_connect_data, BULK_MBITS))
3190                         req->rq_mbits = lustre_msg_get_mbits(req->rq_reqmsg);
3191                 else /* old version, bulk matchbits is rq_xid */
3192                         req->rq_mbits = req->rq_xid;
3193
3194                 if (rc == 0)
3195                         rc = ptlrpc_start_bulk_transfer(desc);
3196         }
3197
3198         if (rc < 0) {
3199                 DEBUG_REQ(D_ERROR, req, "bulk %s failed: rc %d",
3200                           bulk2type(req), rc);
3201                 RETURN(rc);
3202         }
3203
3204         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
3205                 ptlrpc_abort_bulk(desc);
3206                 RETURN(0);
3207         }
3208
3209         /* limit actual bulk transfer to bulk_timeout seconds */
3210         deadline = start + bulk_timeout;
3211         if (deadline > req->rq_deadline)
3212                 deadline = req->rq_deadline;
3213
3214         do {
3215                 time64_t timeoutl = deadline - ktime_get_real_seconds();
3216                 long timeout_jiffies = timeoutl <= 0 ?
3217                                        1 : cfs_time_seconds(timeoutl);
3218                 time64_t rq_deadline;
3219
3220                 *lwi = LWI_TIMEOUT_INTERVAL(timeout_jiffies,
3221                                             cfs_time_seconds(1),
3222                                             target_bulk_timeout, desc);
3223                 rc = l_wait_event(desc->bd_waitq,
3224                                   !ptlrpc_server_bulk_active(desc) ||
3225                                   exp->exp_failed ||
3226                                   exp->exp_conn_cnt >
3227                                   lustre_msg_get_conn_cnt(req->rq_reqmsg),
3228                                   lwi);
3229                 LASSERT(rc == 0 || rc == -ETIMEDOUT);
3230                 /* Wait again if we changed rq_deadline. */
3231                 rq_deadline = READ_ONCE(req->rq_deadline);
3232                 deadline = start + bulk_timeout;
3233                 if (deadline > rq_deadline)
3234                         deadline = rq_deadline;
3235         } while (rc == -ETIMEDOUT &&
3236                  deadline > ktime_get_real_seconds());
3237
3238         if (rc == -ETIMEDOUT) {
3239                 DEBUG_REQ(D_ERROR, req, "timeout on bulk %s after %lld%+llds",
3240                           bulk2type(req), deadline - start,
3241                           ktime_get_real_seconds() - deadline);
3242                 ptlrpc_abort_bulk(desc);
3243         } else if (exp->exp_failed) {
3244                 DEBUG_REQ(D_ERROR, req, "Eviction on bulk %s",
3245                           bulk2type(req));
3246                 rc = -ENOTCONN;
3247                 ptlrpc_abort_bulk(desc);
3248         } else if (exp->exp_conn_cnt >
3249                    lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3250                 DEBUG_REQ(D_ERROR, req, "Reconnect on bulk %s",
3251                           bulk2type(req));
3252                 /* We don't reply anyway. */
3253                 rc = -ETIMEDOUT;
3254                 ptlrpc_abort_bulk(desc);
3255         } else if (desc->bd_failure) {
3256                 DEBUG_REQ(D_ERROR, req, "network error on bulk %s",
3257                           bulk2type(req));
3258                 /* XXX should this be a different errno? */
3259                 rc = -ETIMEDOUT;
3260         } else {
3261                 if (req->rq_bulk_write)
3262                         rc = sptlrpc_svc_unwrap_bulk(req, desc);
3263                 if (rc == 0 && desc->bd_nob_transferred != desc->bd_nob) {
3264                         DEBUG_REQ(D_ERROR, req, "truncated bulk %s %d(%d)",
3265                                   bulk2type(req), desc->bd_nob_transferred,
3266                                   desc->bd_nob);
3267                         /* XXX should this be a different errno? */
3268                         rc = -ETIMEDOUT;
3269                 }
3270         }
3271
3272         RETURN(rc);
3273 }
3274 EXPORT_SYMBOL(target_bulk_io);
3275
3276 #endif /* HAVE_SERVER_SUPPORT */