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  */
  31
  32 /**
  33  * This file deals with various client/target related logic including recovery.
  34  *
  35  * TODO: This code more logically belongs in the ptlrpc module than in ldlm and
  36  * should be moved.
  37  */
  38
  39 #define DEBUG_SUBSYSTEM S_LDLM
  40
  41 #include <cl_object.h>
  42 #include <linux/fs_struct.h>
  43 #include <linux/jiffies.h>
  44 #include <linux/kernel.h>
  45 #include <linux/kthread.h>
  46 #include <libcfs/libcfs.h>
  47 #include <obd.h>
  48 #include <obd_class.h>
  49 #include <lustre_dlm.h>
  50 #include <lustre_net.h>
  51 #include <lustre_sec.h>
  52 #include <uapi/linux/lustre/lustre_ioctl.h>
  53 #include "ldlm_internal.h"
  54
  55 /*
  56  * @priority: If non-zero, move the selected connection to the list head.
  57  * @create: If zero, only search in existing connections.
  58  */
  59 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  60                            int priority, int create)
  61 {
  62         struct ptlrpc_connection *ptlrpc_conn;
  63         struct obd_import_conn *imp_conn = NULL, *item;
  64         u32 refnet = imp->imp_conn_restricted_net;
  65         int rc = 0;
  66
  67         ENTRY;
  68
  69         if (!create && !priority) {
  70                 CDEBUG(D_HA, "Nothing to do\n");
  71                 RETURN(-EINVAL);
  72         }
  73
  74         /* refnet is used to restrict network connections */
  75         if (refnet != LNET_NET_ANY)
  76                 CDEBUG(D_HA, "imp %s: restrict %s to %s net\n",
  77                        imp->imp_obd->obd_name, uuid->uuid,
  78                        libcfs_net2str(refnet));
  79
  80         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, refnet);
  81         if (!ptlrpc_conn) {
  82                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  83                 RETURN(-ENOENT);
  84         }
  85
  86         if (create) {
  87                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  88                 if (!imp_conn)
  89                         GOTO(out_put, rc = -ENOMEM);
  90         }
  91
  92         spin_lock(&imp->imp_lock);
  93         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  94                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  95                         if (priority) {
  96                                 list_move(&item->oic_item,
  97                                           &imp->imp_conn_list);
  98                                 item->oic_last_attempt = 0;
  99                         }
 100                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
 101                                imp, imp->imp_obd->obd_name, uuid->uuid,
 102                                (priority ? ", moved to head" : ""));
 103                         spin_unlock(&imp->imp_lock);
 104                         GOTO(out_free, rc = 0);
 105                 }
 106         }
 107         /* No existing import connection found for \a uuid. */
 108         if (create) {
 109                 imp_conn->oic_conn = ptlrpc_conn;
 110                 imp_conn->oic_uuid = *uuid;
 111                 imp_conn->oic_last_attempt = 0;
 112                 if (priority)
 113                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 114                 else
 115                         list_add_tail(&imp_conn->oic_item,
 116                                       &imp->imp_conn_list);
 117                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 118                        imp, imp->imp_obd->obd_name, uuid->uuid,
 119                        (priority ? "head" : "tail"));
 120         } else {
 121                 spin_unlock(&imp->imp_lock);
 122                 GOTO(out_free, rc = -ENOENT);
 123         }
 124
 125         spin_unlock(&imp->imp_lock);
 126         RETURN(0);
 127 out_free:
 128         if (imp_conn)
 129                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 130 out_put:
 131         ptlrpc_connection_put(ptlrpc_conn);
 132         RETURN(rc);
 133 }
 134
 135 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 136 {
 137         return import_set_conn(imp, uuid, 1, 0);
 138 }
 139
 140 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 141                            int priority)
 142 {
 143         return import_set_conn(imp, uuid, priority, 1);
 144 }
 145 EXPORT_SYMBOL(client_import_add_conn);
 146
 147 int client_import_dyn_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 148                                lnet_nid_t prim_nid4, int priority)
 149 {
 150         struct ptlrpc_connection *ptlrpc_conn;
 151         struct lnet_nid prim_nid;
 152         int rc;
 153
 154         lnet_nid4_to_nid(prim_nid4, &prim_nid);
 155         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, LNET_NID_NET(&prim_nid));
 156         if (!ptlrpc_conn) {
 157                 const char *str_uuid = obd_uuid2str(uuid);
 158
 159                 rc = class_add_uuid(str_uuid, &prim_nid);
 160                 if (rc) {
 161                         CERROR("%s: failed to add UUID '%s': rc = %d\n",
 162                                imp->imp_obd->obd_name, str_uuid, rc);
 163                         return rc;
 164                 }
 165         }
 166         return import_set_conn(imp, uuid, priority, 1);
 167 }
 168 EXPORT_SYMBOL(client_import_dyn_add_conn);
 169
 170 int client_import_add_nids_to_conn(struct obd_import *imp, lnet_nid_t *nids,
 171                                    int nid_count, struct obd_uuid *uuid)
 172 {
 173         struct obd_import_conn *conn;
 174         int rc = -ENOENT;
 175
 176         ENTRY;
 177         if (nid_count <= 0 || !nids)
 178                 return rc;
 179
 180         spin_lock(&imp->imp_lock);
 181         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 182                 struct lnet_nid nid;
 183
 184                 lnet_nid4_to_nid(nids[0], &nid);
 185                 if (class_check_uuid(&conn->oic_uuid, &nid)) {
 186                         *uuid = conn->oic_uuid;
 187                         spin_unlock(&imp->imp_lock);
 188                         rc = class_add_nids_to_uuid(&conn->oic_uuid, nids,
 189                                                     nid_count);
 190                         RETURN(rc);
 191                 }
 192         }
 193         spin_unlock(&imp->imp_lock);
 194         RETURN(rc);
 195 }
 196 EXPORT_SYMBOL(client_import_add_nids_to_conn);
 197
 198 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 199 {
 200         struct obd_import_conn *imp_conn;
 201         struct obd_export *dlmexp;
 202         int rc = -ENOENT;
 203
 204         ENTRY;
 205
 206         spin_lock(&imp->imp_lock);
 207         if (list_empty(&imp->imp_conn_list)) {
 208                 LASSERT(!imp->imp_connection);
 209                 GOTO(out, rc);
 210         }
 211
 212         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 213                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 214                         continue;
 215                 LASSERT(imp_conn->oic_conn);
 216
 217                 if (imp_conn == imp->imp_conn_current) {
 218                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 219
 220                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 221                             imp->imp_state != LUSTRE_IMP_DISCON) {
 222                                 CERROR("can't remove current connection\n");
 223                                 GOTO(out, rc = -EBUSY);
 224                         }
 225
 226                         ptlrpc_connection_put(imp->imp_connection);
 227                         imp->imp_connection = NULL;
 228
 229                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 230                         if (dlmexp && dlmexp->exp_connection) {
 231                                 LASSERT(dlmexp->exp_connection ==
 232                                         imp_conn->oic_conn);
 233                                 ptlrpc_connection_put(dlmexp->exp_connection);
 234                                 dlmexp->exp_connection = NULL;
 235                         }
 236
 237                         if (dlmexp != NULL)
 238                                 class_export_put(dlmexp);
 239                 }
 240
 241                 list_del(&imp_conn->oic_item);
 242                 ptlrpc_connection_put(imp_conn->oic_conn);
 243                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 244                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 245                        imp, imp->imp_obd->obd_name, uuid->uuid);
 246                 rc = 0;
 247                 break;
 248         }
 249 out:
 250         spin_unlock(&imp->imp_lock);
 251         if (rc == -ENOENT)
 252                 CERROR("connection %s not found\n", uuid->uuid);
 253         RETURN(rc);
 254 }
 255 EXPORT_SYMBOL(client_import_del_conn);
 256
 257 void client_destroy_import(struct obd_import *imp)
 258 {
 259         /*
 260          * Drop security policy instance after all RPCs have finished/aborted
 261          * to let all busy contexts be released.
 262          */
 263         class_import_get(imp);
 264         class_destroy_import(imp);
 265         sptlrpc_import_sec_put(imp);
 266         class_import_put(imp);
 267 }
 268 EXPORT_SYMBOL(client_destroy_import);
 269
 270 /**
 271  * Check whether or not the OSC is on MDT.
 272  * In the config log,
 273  * osc on MDT
 274  *      setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
 275  * osc on client
 276  *      setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
 277  *
 278  **/
 279 static int osc_on_mdt(char *obdname)
 280 {
 281         char *ptr;
 282
 283         ptr = strrchr(obdname, '-');
 284         if (ptr == NULL)
 285                 return 0;
 286
 287         if (strncmp(ptr + 1, "MDT", 3) == 0)
 288                 return 1;
 289
 290         return 0;
 291 }
 292
 293 /*
 294  * Configure an RPC client OBD device.
 295  *
 296  * lcfg parameters:
 297  * 1 - client UUID
 298  * 2 - server UUID
 299  * 3 - inactive-on-startup
 300  * 4 - restrictive net
 301  */
 302 int client_obd_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 303 {
 304         struct client_obd *cli = &obd->u.cli;
 305         struct obd_import *imp;
 306         struct obd_uuid server_uuid;
 307         int rq_portal, rp_portal, connect_op;
 308         const char *name = obd->obd_type->typ_name;
 309         enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
 310         char *cli_name = lustre_cfg_buf(lcfg, 0);
 311         int rc;
 312
 313         ENTRY;
 314
 315         /*
 316          * In a more perfect world, we would hang a ptlrpc_client off of
 317          * obd_type and just use the values from there.
 318          */
 319         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 320                 rq_portal = OST_REQUEST_PORTAL;
 321                 rp_portal = OSC_REPLY_PORTAL;
 322                 connect_op = OST_CONNECT;
 323                 cli->cl_sp_me = LUSTRE_SP_CLI;
 324                 cli->cl_sp_to = LUSTRE_SP_OST;
 325                 ns_type = LDLM_NS_TYPE_OSC;
 326         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
 327                    !strcmp(name, LUSTRE_LWP_NAME)) {
 328                 rq_portal = MDS_REQUEST_PORTAL;
 329                 rp_portal = MDC_REPLY_PORTAL;
 330                 connect_op = MDS_CONNECT;
 331                 if (is_lwp_on_ost(cli_name))
 332                         cli->cl_sp_me = LUSTRE_SP_OST;
 333                 else if (is_lwp_on_mdt(cli_name))
 334                         cli->cl_sp_me = LUSTRE_SP_MDT;
 335                 else
 336                         cli->cl_sp_me = LUSTRE_SP_CLI;
 337                 cli->cl_sp_to = LUSTRE_SP_MDT;
 338                 ns_type = LDLM_NS_TYPE_MDC;
 339         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
 340                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
 341                         /* OSP_on_MDT for other MDTs */
 342                         connect_op = MDS_CONNECT;
 343                         cli->cl_sp_to = LUSTRE_SP_MDT;
 344                         ns_type = LDLM_NS_TYPE_MDC;
 345                         rq_portal = OUT_PORTAL;
 346                 } else {
 347                         /* OSP on MDT for OST */
 348                         connect_op = OST_CONNECT;
 349                         cli->cl_sp_to = LUSTRE_SP_OST;
 350                         ns_type = LDLM_NS_TYPE_OSC;
 351                         rq_portal = OST_REQUEST_PORTAL;
 352                 }
 353                 rp_portal = OSC_REPLY_PORTAL;
 354                 cli->cl_sp_me = LUSTRE_SP_MDT;
 355         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 356                 rq_portal = MGS_REQUEST_PORTAL;
 357                 rp_portal = MGC_REPLY_PORTAL;
 358                 connect_op = MGS_CONNECT;
 359                 cli->cl_sp_me = LUSTRE_SP_MGC;
 360                 cli->cl_sp_to = LUSTRE_SP_MGS;
 361                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 362                 ns_type = LDLM_NS_TYPE_MGC;
 363         } else {
 364                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 365                        name);
 366                 RETURN(-EINVAL);
 367         }
 368
 369         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 370                 CERROR("requires a TARGET UUID\n");
 371                 RETURN(-EINVAL);
 372         }
 373
 374         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 375                 CERROR("client UUID must be less than 38 characters\n");
 376                 RETURN(-EINVAL);
 377         }
 378
 379         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 380                 CERROR("setup requires a SERVER UUID\n");
 381                 RETURN(-EINVAL);
 382         }
 383
 384         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 385                 CERROR("target UUID must be less than 38 characters\n");
 386                 RETURN(-EINVAL);
 387         }
 388
 389         init_rwsem(&cli->cl_sem);
 390         mutex_init(&cli->cl_mgc_mutex);
 391         cli->cl_seq = NULL;
 392         init_rwsem(&cli->cl_seq_rwsem);
 393         cli->cl_conn_count = 0;
 394         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 395                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 396                      sizeof(server_uuid)));
 397
 398         cli->cl_dirty_pages = 0;
 399         cli->cl_dirty_max_pages = 0;
 400         cli->cl_avail_grant = 0;
 401         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
 402         /*
 403          * cl_dirty_max_pages may be changed at connect time in
 404          * ptlrpc_connect_interpret().
 405          */
 406         client_adjust_max_dirty(cli);
 407         init_waitqueue_head(&cli->cl_cache_waiters);
 408         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 409         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 410         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 411         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 412         spin_lock_init(&cli->cl_loi_list_lock);
 413         atomic_set(&cli->cl_pending_w_pages, 0);
 414         atomic_set(&cli->cl_pending_r_pages, 0);
 415         cli->cl_r_in_flight = 0;
 416         cli->cl_w_in_flight = 0;
 417
 418         cli->cl_stats_init = ktime_get_real();
 419         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 420         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 421         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 422         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 423         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 424         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 425         spin_lock_init(&cli->cl_batch_rpc_hist.oh_lock);
 426
 427         /* lru for osc. */
 428         INIT_LIST_HEAD(&cli->cl_lru_osc);
 429         atomic_set(&cli->cl_lru_shrinkers, 0);
 430         atomic_long_set(&cli->cl_lru_busy, 0);
 431         atomic_long_set(&cli->cl_lru_in_list, 0);
 432         INIT_LIST_HEAD(&cli->cl_lru_list);
 433         spin_lock_init(&cli->cl_lru_list_lock);
 434         atomic_long_set(&cli->cl_unstable_count, 0);
 435         INIT_LIST_HEAD(&cli->cl_shrink_list);
 436         INIT_LIST_HEAD(&cli->cl_grant_chain);
 437
 438         INIT_LIST_HEAD(&cli->cl_flight_waiters);
 439         cli->cl_rpcs_in_flight = 0;
 440
 441         init_waitqueue_head(&cli->cl_destroy_waitq);
 442         atomic_set(&cli->cl_destroy_in_flight, 0);
 443
 444
 445         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 446         cli->cl_preferred_cksum_type = 0;
 447 #ifdef CONFIG_ENABLE_CHECKSUM
 448         /* Turn on checksumming by default. */
 449         cli->cl_checksum = 1;
 450         /*
 451          * The supported checksum types will be worked out at connect time
 452          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 453          * through procfs.
 454          */
 455         cli->cl_cksum_type = cli->cl_supp_cksum_types;
 456 #endif
 457         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 458
 459         /*
 460          * Set it to possible maximum size. It may be reduced by ocd_brw_size
 461          * from OFD after connecting.
 462          */
 463         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 464
 465         cli->cl_max_short_io_bytes = OBD_DEF_SHORT_IO_BYTES;
 466
 467         /*
 468          * set cl_chunkbits default value to PAGE_SHIFT,
 469          * it will be updated at OSC connection time.
 470          */
 471         cli->cl_chunkbits = PAGE_SHIFT;
 472
 473         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 474                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 475         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
 476                 cli->cl_max_rpcs_in_flight = 2;
 477         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
 478                 cli->cl_max_rpcs_in_flight = 3;
 479         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
 480                 cli->cl_max_rpcs_in_flight = 4;
 481         } else {
 482                 if (osc_on_mdt(obd->obd_name))
 483                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
 484                 else
 485                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 486         }
 487
 488         spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
 489         cli->cl_max_mod_rpcs_in_flight = 0;
 490         cli->cl_mod_rpcs_in_flight = 0;
 491         cli->cl_close_rpcs_in_flight = 0;
 492         init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
 493         cli->cl_mod_rpcs_init = ktime_get_real();
 494         cli->cl_mod_tag_bitmap = NULL;
 495
 496         INIT_LIST_HEAD(&cli->cl_chg_dev_linkage);
 497
 498         if (connect_op == MDS_CONNECT) {
 499                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
 500                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
 501                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 502                 if (cli->cl_mod_tag_bitmap == NULL)
 503                         GOTO(err, rc = -ENOMEM);
 504         }
 505
 506         rc = ldlm_get_ref();
 507         if (rc) {
 508                 CERROR("ldlm_get_ref failed: %d\n", rc);
 509                 GOTO(err, rc);
 510         }
 511
 512         ptlrpc_init_client(rq_portal, rp_portal, name,
 513                            &obd->obd_ldlm_client);
 514
 515         imp = class_new_import(obd);
 516         if (imp == NULL)
 517                 GOTO(err_ldlm, rc = -ENOENT);
 518         imp->imp_client = &obd->obd_ldlm_client;
 519         imp->imp_connect_op = connect_op;
 520         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 521                LUSTRE_CFG_BUFLEN(lcfg, 1));
 522         class_import_put(imp);
 523
 524         if (lustre_cfg_buf(lcfg, 4)) {
 525                 __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
 526
 527                 if (refnet == LNET_NET_ANY) {
 528                         rc = -EINVAL;
 529                         CERROR("%s: bad mount option 'network=%s': rc = %d\n",
 530                                obd->obd_name, lustre_cfg_string(lcfg, 4),
 531                                rc);
 532                         GOTO(err_import, rc);
 533                 }
 534                 imp->imp_conn_restricted_net = refnet;
 535         } else {
 536                 imp->imp_conn_restricted_net = LNET_NET_ANY;
 537         }
 538
 539         rc = client_import_add_conn(imp, &server_uuid, 1);
 540         if (rc) {
 541                 CERROR("can't add initial connection\n");
 542                 GOTO(err_import, rc);
 543         }
 544         imp->imp_connection = NULL;
 545
 546         cli->cl_import = imp;
 547         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
 548         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 549
 550         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 551                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 552                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 553                                name, obd->obd_name,
 554                                cli->cl_target_uuid.uuid);
 555                         spin_lock(&imp->imp_lock);
 556                         imp->imp_deactive = 1;
 557                         spin_unlock(&imp->imp_lock);
 558                 }
 559         }
 560
 561         obd->obd_namespace = ldlm_namespace_new(obd, obd->obd_name,
 562                                                 LDLM_NAMESPACE_CLIENT,
 563                                                 LDLM_NAMESPACE_GREEDY,
 564                                                 ns_type);
 565         if (IS_ERR(obd->obd_namespace)) {
 566                 rc = PTR_ERR(obd->obd_namespace);
 567                 CERROR("%s: unable to create client namespace: rc = %d\n",
 568                        obd->obd_name, rc);
 569                 obd->obd_namespace = NULL;
 570                 GOTO(err_import, rc);
 571         }
 572
 573         RETURN(rc);
 574
 575 err_import:
 576         class_destroy_import(imp);
 577 err_ldlm:
 578         ldlm_put_ref();
 579 err:
 580         if (cli->cl_mod_tag_bitmap != NULL)
 581                 OBD_FREE(cli->cl_mod_tag_bitmap,
 582                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 583         cli->cl_mod_tag_bitmap = NULL;
 584
 585         RETURN(rc);
 586 }
 587 EXPORT_SYMBOL(client_obd_setup);
 588
 589 int client_obd_cleanup(struct obd_device *obd)
 590 {
 591         struct client_obd *cli = &obd->u.cli;
 592
 593         ENTRY;
 594
 595         ldlm_namespace_free_post(obd->obd_namespace);
 596         obd->obd_namespace = NULL;
 597
 598         obd_cleanup_client_import(obd);
 599         LASSERT(obd->u.cli.cl_import == NULL);
 600
 601         ldlm_put_ref();
 602
 603         if (cli->cl_mod_tag_bitmap != NULL)
 604                 OBD_FREE(cli->cl_mod_tag_bitmap,
 605                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 606         cli->cl_mod_tag_bitmap = NULL;
 607
 608         RETURN(0);
 609 }
 610 EXPORT_SYMBOL(client_obd_cleanup);
 611
 612 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 613 int client_connect_import(const struct lu_env *env,
 614                           struct obd_export **exp,
 615                           struct obd_device *obd, struct obd_uuid *cluuid,
 616                           struct obd_connect_data *data, void *localdata)
 617 {
 618         struct client_obd *cli = &obd->u.cli;
 619         struct obd_import *imp = cli->cl_import;
 620         struct obd_connect_data *ocd;
 621         struct lustre_handle conn = { 0 };
 622         int rc;
 623
 624         ENTRY;
 625
 626         *exp = NULL;
 627         down_write(&cli->cl_sem);
 628         if (cli->cl_conn_count > 0)
 629                 GOTO(out_sem, rc = -EALREADY);
 630
 631         rc = class_connect(&conn, obd, cluuid);
 632         if (rc)
 633                 GOTO(out_sem, rc);
 634
 635         cli->cl_conn_count++;
 636         *exp = class_conn2export(&conn);
 637
 638         LASSERT(obd->obd_namespace);
 639
 640         spin_lock(&imp->imp_lock);
 641         if (imp->imp_state == LUSTRE_IMP_CLOSED && imp->imp_deactive) {
 642                 /* need to reactivate import if trying to connect
 643                  * to a previously disconnected
 644                  */
 645                 imp->imp_deactive = 0;
 646                 imp->imp_invalid = 0;
 647         }
 648         spin_unlock(&imp->imp_lock);
 649
 650         imp->imp_dlm_handle = conn;
 651         rc = ptlrpc_init_import(imp);
 652         if (rc != 0)
 653                 GOTO(out_ldlm, rc);
 654
 655         ocd = &imp->imp_connect_data;
 656         if (data) {
 657                 *ocd = *data;
 658                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 659                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
 660         }
 661
 662         rc = ptlrpc_connect_import(imp);
 663         if (rc != 0) {
 664                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 665                 GOTO(out_ldlm, rc);
 666         }
 667         LASSERT(*exp != NULL && (*exp)->exp_connection);
 668
 669         if (data) {
 670                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 671                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 672                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 673                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 674                 data->ocd_connect_flags2 = ocd->ocd_connect_flags2;
 675         }
 676
 677         ptlrpc_pinger_add_import(imp);
 678
 679         EXIT;
 680
 681         if (rc) {
 682 out_ldlm:
 683                 cli->cl_conn_count--;
 684                 class_disconnect(*exp);
 685                 *exp = NULL;
 686         }
 687 out_sem:
 688         up_write(&cli->cl_sem);
 689
 690         if (!rc && localdata && !cli->cl_cache) {
 691                 cli->cl_cache = (struct cl_client_cache *)localdata;
 692                 cl_cache_incref(cli->cl_cache);
 693                 cli->cl_lru_left = &cli->cl_cache->ccc_lru_left;
 694
 695                 /* add this osc into entity list */
 696                 LASSERT(list_empty(&cli->cl_lru_osc));
 697                 spin_lock(&cli->cl_cache->ccc_lru_lock);
 698                 list_add(&cli->cl_lru_osc, &cli->cl_cache->ccc_lru);
 699                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
 700         }
 701
 702         return rc;
 703 }
 704 EXPORT_SYMBOL(client_connect_import);
 705
 706 int client_disconnect_export(struct obd_export *exp)
 707 {
 708         struct obd_device *obd = class_exp2obd(exp);
 709         struct client_obd *cli;
 710         struct obd_import *imp;
 711         int rc = 0, err;
 712
 713         ENTRY;
 714
 715         if (!obd) {
 716                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 717                        exp, exp ? exp->exp_handle.h_cookie : -1);
 718                 RETURN(-EINVAL);
 719         }
 720
 721         cli = &obd->u.cli;
 722         imp = cli->cl_import;
 723
 724         down_write(&cli->cl_sem);
 725         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
 726                 cli->cl_conn_count);
 727
 728         if (cli->cl_conn_count == 0) {
 729                 CERROR("disconnecting disconnected device (%s)\n",
 730                        obd->obd_name);
 731                 GOTO(out_disconnect, rc = -EINVAL);
 732         }
 733
 734         cli->cl_conn_count--;
 735         if (cli->cl_conn_count != 0)
 736                 GOTO(out_disconnect, rc = 0);
 737
 738         /*
 739          * Mark import deactivated now, so we don't try to reconnect if any
 740          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 741          * fully deactivate the import, or that would drop all requests.
 742          */
 743         spin_lock(&imp->imp_lock);
 744         imp->imp_deactive = 1;
 745         spin_unlock(&imp->imp_lock);
 746
 747         /*
 748          * Some non-replayable imports (MDS's OSCs) are pinged, so just
 749          * delete it regardless.  (It's safe to delete an import that was
 750          * never added.)
 751          */
 752         (void)ptlrpc_pinger_del_import(imp);
 753
 754         if (obd->obd_namespace != NULL) {
 755                 /* obd_force == local only */
 756                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 757                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 758                 ldlm_namespace_free_prior(obd->obd_namespace, imp,
 759                                           obd->obd_force);
 760         }
 761
 762         /*
 763          * There's no need to hold sem while disconnecting an import,
 764          * and it may actually cause deadlock in GSS.
 765          */
 766         up_write(&cli->cl_sem);
 767         rc = ptlrpc_disconnect_import(imp, 0);
 768         down_write(&cli->cl_sem);
 769
 770         ptlrpc_invalidate_import(imp);
 771
 772         EXIT;
 773
 774 out_disconnect:
 775         /*
 776          * Use server style - class_disconnect should be always called for
 777          * o_disconnect.
 778          */
 779         err = class_disconnect(exp);
 780         if (!rc && err)
 781                 rc = err;
 782
 783         up_write(&cli->cl_sem);
 784
 785         RETURN(rc);
 786 }
 787 EXPORT_SYMBOL(client_disconnect_export);
 788
 789 #ifdef HAVE_SERVER_SUPPORT
 790 int server_disconnect_export(struct obd_export *exp)
 791 {
 792         int rc;
 793
 794         ENTRY;
 795
 796         /* Disconnect early so that clients can't keep using export. */
 797         rc = class_disconnect(exp);
 798         /* Close import to avoid sending any requests. */
 799         if (exp->exp_imp_reverse)
 800                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 801
 802         ldlm_bl_thread_wakeup();
 803
 804         /* complete all outstanding replies */
 805         spin_lock(&exp->exp_lock);
 806         while (!list_empty(&exp->exp_outstanding_replies)) {
 807                 struct ptlrpc_reply_state *rs =
 808                         list_first_entry(&exp->exp_outstanding_replies,
 809                                          struct ptlrpc_reply_state,
 810                                          rs_exp_list);
 811                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 812
 813                 spin_lock(&svcpt->scp_rep_lock);
 814
 815                 list_del_init(&rs->rs_exp_list);
 816
 817                 spin_lock(&rs->rs_lock);
 818                 /* clear rs_convert_lock to make sure rs is handled and put */
 819                 rs->rs_convert_lock = 0;
 820                 ptlrpc_schedule_difficult_reply(rs);
 821                 spin_unlock(&rs->rs_lock);
 822
 823                 spin_unlock(&svcpt->scp_rep_lock);
 824         }
 825         spin_unlock(&exp->exp_lock);
 826
 827         RETURN(rc);
 828 }
 829 EXPORT_SYMBOL(server_disconnect_export);
 830
 831 static inline int target_check_recovery_timer(struct obd_device *target)
 832 {
 833         ktime_t remaining;
 834         s64 timeout;
 835
 836         if (!target->obd_recovering || target->obd_recovery_start == 0)
 837                 return 0;
 838
 839         remaining = hrtimer_get_remaining(&target->obd_recovery_timer);
 840         timeout = ktime_divns(remaining, NSEC_PER_SEC);
 841         if (timeout > -30)
 842                 return 0;
 843
 844         /* the recovery timer should expire, but it isn't triggered,
 845          * it's better to abort the recovery of this target to speed up
 846          * the recovery of the whole cluster. */
 847         spin_lock(&target->obd_dev_lock);
 848         if (target->obd_recovering) {
 849                 CERROR("%s: Aborting recovery\n", target->obd_name);
 850                 target->obd_abort_recovery = 1;
 851                 wake_up(&target->obd_next_transno_waitq);
 852         }
 853         spin_unlock(&target->obd_dev_lock);
 854         return 0;
 855 }
 856
 857 /*
 858  * --------------------------------------------------------------------------
 859  * from old lib/target.c
 860  * --------------------------------------------------------------------------
 861  */
 862 static int target_handle_reconnect(struct lustre_handle *conn,
 863                                    struct obd_export *exp,
 864                                    struct obd_uuid *cluuid)
 865 {
 866         struct obd_device *target;
 867         struct lustre_handle *hdl;
 868         ktime_t remaining;
 869         s64 timeout;
 870         int rc = 0;
 871
 872         ENTRY;
 873         hdl = &exp->exp_imp_reverse->imp_remote_handle;
 874         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
 875                 conn->cookie = exp->exp_handle.h_cookie;
 876                 CDEBUG(D_HA,
 877                        "connect export for UUID '%s' at %p, cookie %#llx\n",
 878                        cluuid->uuid, exp, conn->cookie);
 879                 RETURN(0);
 880         }
 881
 882         target = exp->exp_obd;
 883
 884         /* Might be a re-connect after a partition. */
 885         if (memcmp(&conn->cookie, &hdl->cookie, sizeof(conn->cookie))) {
 886                 LCONSOLE_WARN("%s: already connected client %s (at %s) with handle %#llx. Rejecting client with the same UUID trying to reconnect with handle %#llx\n",
 887                               target->obd_name,
 888                               obd_uuid2str(&exp->exp_client_uuid),
 889                               obd_export_nid2str(exp),
 890                               hdl->cookie, conn->cookie);
 891                 memset(conn, 0, sizeof(*conn));
 892                 /*
 893                  * target_handle_connect() treats EALREADY and
 894                  * -EALREADY differently.  -EALREADY is an error
 895                  * (same UUID, different handle).
 896                  */
 897                 RETURN(-EALREADY);
 898         }
 899
 900         if (!target->obd_recovering) {
 901                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
 902                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
 903                         obd_export_nid2str(exp));
 904                 GOTO(out_already, rc);
 905         }
 906
 907         remaining = hrtimer_get_remaining(&target->obd_recovery_timer);
 908         timeout = ktime_divns(remaining, NSEC_PER_SEC);
 909         if (timeout > 0) {
 910                 LCONSOLE_WARN("%s: Client %s (at %s) reconnected, waiting for %d clients in recovery for %lld:%.02lld\n",
 911                               target->obd_name,
 912                               obd_uuid2str(&exp->exp_client_uuid),
 913                               obd_export_nid2str(exp),
 914                               atomic_read(&target->obd_max_recoverable_clients),
 915                               timeout / 60, timeout % 60);
 916         } else {
 917                 struct target_distribute_txn_data *tdtd;
 918                 int size = 0;
 919                 int count = 0;
 920                 char *buf = NULL;
 921
 922                 target_check_recovery_timer(target);
 923
 924                 tdtd = class_exp2tgt(exp)->lut_tdtd;
 925                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
 926                         buf = tdtd->tdtd_show_update_logs_retrievers(
 927                                 tdtd->tdtd_show_retrievers_cbdata,
 928                                 &size, &count);
 929
 930                 if (count > 0)
 931                         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",
 932                                       target->obd_name,
 933                                       obd_uuid2str(&exp->exp_client_uuid),
 934                                       obd_export_nid2str(exp), count,
 935                                       buf ? buf : "unknown (not enough RAM)",
 936                                       (abs(timeout) + target->obd_recovery_timeout) / 60,
 937                                       (abs(timeout) + target->obd_recovery_timeout) % 60,
 938                                       target->obd_name);
 939                 else
 940                         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",
 941                                       target->obd_name, abs(timeout) / 60,
 942                                       abs(timeout) % 60, target->obd_name);
 943
 944                 if (buf != NULL)
 945                         OBD_FREE(buf, size);
 946         }
 947
 948 out_already:
 949         conn->cookie = exp->exp_handle.h_cookie;
 950         /*
 951          * target_handle_connect() treats EALREADY and
 952          * -EALREADY differently.  EALREADY means we are
 953          * doing a valid reconnect from the same client.
 954          */
 955         RETURN(EALREADY);
 956 }
 957
 958 static void
 959 check_and_start_recovery_timer(struct obd_device *obd,
 960                                struct ptlrpc_request *req, int new_client);
 961
 962 /**
 963  * update flags for import during reconnect process
 964  */
 965 static int rev_import_flags_update(struct obd_import *revimp,
 966                                    struct ptlrpc_request *req)
 967 {
 968         int rc;
 969         struct obd_connect_data *data;
 970
 971         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 972
 973         if (data->ocd_connect_flags & OBD_CONNECT_AT)
 974                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 975         else
 976                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 977
 978         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
 979
 980         revimp->imp_connect_data = *data;
 981         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
 982         if (rc) {
 983                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
 984                         revimp->imp_client->cli_name,
 985                         libcfs_idstr(&req->rq_peer), rc);
 986                 return rc;
 987         }
 988
 989         return 0;
 990 }
 991
 992 /**
 993  * Allocate a new reverse import for an export.
 994  *
 995  * \retval -errno in case error hit
 996  * \retval 0 if reverse import correctly init
 997  **/
 998 int rev_import_init(struct obd_export *export)
 999 {
1000         struct obd_device *obd = export->exp_obd;
1001         struct obd_import *revimp;
1002
1003         LASSERT(export->exp_imp_reverse == NULL);
1004
1005         revimp = class_new_import(obd);
1006         if (revimp == NULL)
1007                 return -ENOMEM;
1008
1009         revimp->imp_remote_handle.cookie = 0ULL;
1010         revimp->imp_client = &obd->obd_ldlm_client;
1011         revimp->imp_dlm_fake = 1;
1012
1013         /* it is safe to connect import in new state as no sends possible */
1014         spin_lock(&export->exp_lock);
1015         export->exp_imp_reverse = revimp;
1016         spin_unlock(&export->exp_lock);
1017         class_import_put(revimp);
1018
1019         return 0;
1020 }
1021 EXPORT_SYMBOL(rev_import_init);
1022
1023 /**
1024  * Handle reconnect for an export.
1025  *
1026  * \param exp export to handle reconnect process
1027  * \param req client reconnect request
1028  *
1029  * \retval -rc in case securitfy flavor can't be changed
1030  * \retval 0 in case none problems
1031  */
1032 static int rev_import_reconnect(struct obd_export *exp,
1033                                 struct ptlrpc_request *req)
1034 {
1035         struct obd_import *revimp = exp->exp_imp_reverse;
1036         struct lustre_handle *lh;
1037         int rc;
1038
1039         /* avoid sending a request until import flags are changed */
1040         ptlrpc_import_enter_resend(revimp);
1041
1042         ptlrpc_connection_put(revimp->imp_connection);
1043
1044         /*
1045          * client from recovery don't have a handle so we need to take from
1046          * request. it may produce situation when wrong client connected
1047          * to recovery as we trust a client uuid
1048          */
1049         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1050         revimp->imp_remote_handle = *lh;
1051
1052         /*
1053          * unknown versions will be caught in
1054          * ptlrpc_handle_server_req_in->lustre_unpack_msg()
1055          */
1056         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1057
1058         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
1059
1060         rc = rev_import_flags_update(revimp, req);
1061         if (rc != 0) {
1062                 /*
1063                  * it is safe to still be in RECOVERY phase as we are not able
1064                  * to setup correct security flavor so requests are not able to
1065                  * be delivered correctly
1066                  */
1067                 return rc;
1068         }
1069
1070         /* resend all rpc's via new connection */
1071         return ptlrpc_import_recovery_state_machine(revimp);
1072 }
1073
1074 int target_handle_connect(struct ptlrpc_request *req)
1075 {
1076         struct obd_device *target = NULL;
1077         struct obd_export *export = NULL;
1078         /*
1079          * connect handle - filled from target_handle_reconnect in
1080          * reconnect case
1081          */
1082         struct lustre_handle conn;
1083         struct lustre_handle *tmp;
1084         struct obd_uuid cluuid;
1085         char *str;
1086         int rc = 0;
1087         char *target_start;
1088         int target_len;
1089         bool mds_conn = false, lw_client = false, initial_conn = false;
1090         bool mds_mds_conn = false;
1091         bool new_mds_mds_conn = false;
1092         struct obd_connect_data *data, *tmpdata;
1093         int size, tmpsize;
1094 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1095         int tmp_exp_old_falloc;
1096 #endif
1097         struct ptlrpc_connection *pcon = NULL;
1098         bool reconnected = false;
1099
1100         ENTRY;
1101
1102         CFS_RACE(OBD_FAIL_TGT_CONN_RACE);
1103
1104         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
1105         if (str == NULL) {
1106                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
1107                 GOTO(out, rc = -EINVAL);
1108         }
1109
1110         target = class_dev_by_str(str);
1111         if (!target) {
1112                 deuuidify(str, NULL, &target_start, &target_len);
1113                 LCONSOLE_ERROR_MSG(0x137,
1114                                    "%s: not available for connect from %s (no target). If you are running an HA pair check that the target is mounted on the other server.\n",
1115                                    str, libcfs_nidstr(&req->rq_peer.nid));
1116                 GOTO(out, rc = -ENODEV);
1117         }
1118
1119         spin_lock(&target->obd_dev_lock);
1120
1121         target->obd_conn_inprogress++;
1122
1123         if (target->obd_stopping || !target->obd_set_up) {
1124                 spin_unlock(&target->obd_dev_lock);
1125
1126                 deuuidify(str, NULL, &target_start, &target_len);
1127                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
1128                               target_len, target_start,
1129                               libcfs_nidstr(&req->rq_peer.nid),
1130                               (target->obd_stopping ?
1131                                "stopping" : "not set up"));
1132                 GOTO(out, rc = -ENODEV);
1133         }
1134
1135         if (target->obd_no_conn) {
1136                 spin_unlock(&target->obd_dev_lock);
1137
1138                 CDEBUG(D_INFO,
1139                        "%s: Temporarily refusing client connection from %s\n",
1140                        target->obd_name, libcfs_nidstr(&req->rq_peer.nid));
1141                 GOTO(out, rc = -EAGAIN);
1142         }
1143
1144         spin_unlock(&target->obd_dev_lock);
1145
1146         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1147         if (str == NULL) {
1148                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1149                 GOTO(out, rc = -EINVAL);
1150         }
1151
1152         obd_str2uuid(&cluuid, str);
1153
1154         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1155         if (tmp == NULL)
1156                 GOTO(out, rc = -EPROTO);
1157
1158         conn = *tmp;
1159
1160         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1161                                     RCL_CLIENT);
1162         if (size < 0 || size > 8 * sizeof(struct obd_connect_data))
1163                 GOTO(out, rc = -EPROTO);
1164         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1165         if (!data)
1166                 GOTO(out, rc = -EPROTO);
1167
1168         rc = req_capsule_server_pack(&req->rq_pill);
1169         if (rc)
1170                 GOTO(out, rc);
1171
1172 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1173         /*
1174          * Don't allow clients to connect that are using old 1.8 format
1175          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1176          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1177          * FULL20 flag should be set on all connections since 2.0, but no
1178          * longer affects behaviour.
1179          *
1180          * Later this check will be disabled and the flag can be retired
1181          * completely once interop with 3.0 is no longer needed.
1182          */
1183         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1184                 GOTO(out, rc = -EPROTO);
1185
1186         /* Old clients will have 'tmp_exp_old_falloc' as 1.
1187          * Newer clients (2.15) and beyond will have it set as 0
1188          */
1189         tmp_exp_old_falloc =
1190                 !!(data->ocd_connect_flags & OBD_CONNECT_OLD_FALLOC);
1191
1192         CDEBUG(D_INFO, "%s: ocd_connect_flags: %#llx tmp_exp_old_falloc: %d\n",
1193                target->obd_name, data->ocd_connect_flags, tmp_exp_old_falloc);
1194
1195         /*
1196          * Don't allow liblustre clients to connect.
1197          * - testing was disabled in v2_2_50_0-61-g6a75d65
1198          * - building was disabled in v2_5_58_0-28-g7277179
1199          * - client code was deleted in v2_6_50_0-101-gcdfbc72,
1200          * - clients were refused connect for version difference > 0.0.1.32
1201          */
1202         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1203                 DEBUG_REQ(D_WARNING, req, "Refusing libclient connection");
1204                 GOTO(out, rc = -EPROTO);
1205         }
1206 #endif
1207
1208         /*
1209          * Note: lw_client is needed in MDS-MDS failover during update log
1210          * processing, so we needs to allow lw_client to be connected at
1211          * anytime, instead of only the initial connection
1212          */
1213         lw_client = OCD_HAS_FLAG(data, LIGHTWEIGHT);
1214
1215         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1216                 initial_conn = true;
1217                 mds_conn = OCD_HAS_FLAG(data, MDS);
1218                 mds_mds_conn = OCD_HAS_FLAG(data, MDS_MDS);
1219
1220                 /*
1221                  * OBD_CONNECT_MNE_SWAB is removed at 2.14
1222                  * Checking OBD_CONNECT_FID can be removed in the future.
1223                  *
1224                  * Via check OBD_CONNECT_FID, we can distinguish whether
1225                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1226                  * MGC or MDT, since MGC does not use OBD_CONNECT_FID.
1227                  */
1228                 if (!lw_client &&
1229                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1230                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1231                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1232                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1233                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1234                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1235
1236                         /*
1237                          * We do not support the MDT-MDT interoperations with
1238                          * different version MDT because of protocol changes.
1239                          */
1240                         if (unlikely(major != LUSTRE_MAJOR ||
1241                                      minor != LUSTRE_MINOR ||
1242                                      abs(patch - LUSTRE_PATCH) > 3)) {
1243                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the connection from different version MDT (%d.%d.%d.%d) %s %s\n",
1244                                               target->obd_name, LUSTRE_MAJOR,
1245                                               LUSTRE_MINOR, LUSTRE_PATCH,
1246                                               LUSTRE_FIX, major, minor, patch,
1247                                               OBD_OCD_VERSION_FIX(data->ocd_version),
1248                                               libcfs_nidstr(&req->rq_peer.nid),
1249                                               str);
1250                                 GOTO(out, rc = -EPROTO);
1251                         }
1252                 }
1253         }
1254
1255         /* lctl gets a backstage, all-access pass. */
1256         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1257                 goto dont_check_exports;
1258
1259         export = obd_uuid_lookup(target, &cluuid);
1260         if (!export)
1261                 goto no_export;
1262
1263         /* We've found an export in the hash. */
1264
1265         spin_lock(&export->exp_lock);
1266
1267         if (export->exp_connecting) { /* b=9635, et. al. */
1268                 spin_unlock(&export->exp_lock);
1269                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1270                               export->exp_obd->obd_name, export,
1271                               libcfs_nidstr(&req->rq_peer.nid));
1272                 class_export_put(export);
1273                 export = NULL;
1274                 rc = -EALREADY;
1275         } else if ((mds_conn || (lw_client && initial_conn) ||
1276                    OCD_HAS_FLAG(data, MDS_MDS)) && export->exp_connection) {
1277                 spin_unlock(&export->exp_lock);
1278                 if (!nid_same(&req->rq_peer.nid,
1279                               &export->exp_connection->c_peer.nid)) {
1280                         /* MDS or LWP reconnected after failover. */
1281                         LCONSOLE_WARN("%s: Received %s connection from %s, removing former export from %s\n",
1282                                       target->obd_name,
1283                                       lw_client ? "LWP" : "MDS",
1284                                       libcfs_nidstr(&req->rq_peer.nid),
1285                                       libcfs_nidstr(&export->exp_connection->c_peer.nid));
1286                 } else {
1287                         /* New connection from the same NID. */
1288                         LCONSOLE_WARN("%s: Received new %s connection from %s, %s former export from same NID\n",
1289                                       target->obd_name,
1290                                       lw_client ? "LWP" : "MDS",
1291                                       libcfs_nidstr(&req->rq_peer.nid),
1292                                       OCD_HAS_FLAG(data, MDS_MDS) ?
1293                                       "keep" : "remove");
1294                 }
1295
1296                 if (nid_same(&req->rq_peer.nid,
1297                              &export->exp_connection->c_peer.nid) &&
1298                     OCD_HAS_FLAG(data, MDS_MDS)) {
1299                         /*
1300                          * Because exports between MDTs will always be
1301                          * kept, let's do not fail such export if they
1302                          * come from the same NID, otherwise it might
1303                          * cause eviction between MDTs, which might
1304                          * cause namespace inconsistency
1305                          */
1306                         spin_lock(&export->exp_lock);
1307                         export->exp_connecting = 1;
1308                         export->exp_conn_cnt = 0;
1309                         spin_unlock(&export->exp_lock);
1310                         conn.cookie = export->exp_handle.h_cookie;
1311                         rc = EALREADY;
1312                 } else {
1313                         class_fail_export(export);
1314                         class_export_put(export);
1315                         export = NULL;
1316                         rc = 0;
1317                 }
1318         } else if (export->exp_connection != NULL && initial_conn &&
1319                    !nid_same(&req->rq_peer.nid,
1320                              &export->exp_connection->c_peer.nid)) {
1321                 spin_unlock(&export->exp_lock);
1322                 /* In MDS failover we have static UUID but NID can change. */
1323                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when existing nid %s is already connected\n",
1324                               target->obd_name, cluuid.uuid,
1325                               libcfs_nidstr(&req->rq_peer.nid),
1326                               libcfs_nidstr(
1327                                       &export->exp_connection->c_peer.nid));
1328                 rc = -EALREADY;
1329                 class_export_put(export);
1330                 export = NULL;
1331         } else if (CFS_FAIL_PRECHECK(OBD_FAIL_TGT_RECOVERY_CONNECT) &&
1332                    !lw_client) {
1333                 spin_unlock(&export->exp_lock);
1334                 rc = -EAGAIN;
1335         } else {
1336                 export->exp_connecting = 1;
1337                 spin_unlock(&export->exp_lock);
1338                 LASSERT(export->exp_obd == target);
1339
1340                 rc = target_handle_reconnect(&conn, export, &cluuid);
1341         }
1342
1343         /* If we found an export, we already unlocked. */
1344         if (!export) {
1345 no_export:
1346                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1347         } else if (req->rq_export == NULL &&
1348                    atomic_read(&export->exp_rpc_count) > 0) {
1349                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, still busy with %d references\n",
1350                               target->obd_name, cluuid.uuid,
1351                               libcfs_nidstr(&req->rq_peer.nid),
1352                               refcount_read(&export->exp_handle.h_ref));
1353                         GOTO(out, rc = -EBUSY);
1354         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
1355                    rc != EALREADY) {
1356                 if (!strstr(cluuid.uuid, "mdt"))
1357                         LCONSOLE_WARN("%s: Rejecting reconnect from the known client %s (at %s) because it is indicating it is a new client\n",
1358                                       target->obd_name, cluuid.uuid,
1359                                       libcfs_nidstr(&req->rq_peer.nid));
1360                 GOTO(out, rc = -EALREADY);
1361         } else {
1362                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1363         }
1364
1365         if (rc < 0)
1366                 GOTO(out, rc);
1367
1368         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %lld last %lld\n",
1369                target->obd_name, cluuid.uuid, libcfs_nidstr(&req->rq_peer.nid),
1370                target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1371                export, ktime_get_seconds(),
1372                export ? export->exp_last_request_time : 0);
1373
1374         /*
1375          * If this is the first time a client connects, reset the recovery
1376          * timer. Discard lightweight connections which might be local.
1377          */
1378         if (!lw_client && rc == 0 && target->obd_recovering)
1379                 check_and_start_recovery_timer(target, req, export == NULL);
1380
1381         /*
1382          * We want to handle EALREADY but *not* -EALREADY from
1383          * target_handle_reconnect(), return reconnection state in a flag.
1384          */
1385         if (rc == EALREADY) {
1386                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1387                 rc = 0;
1388         } else {
1389                 LASSERT(rc == 0);
1390         }
1391
1392         /* Tell the client if we support replayable requests. */
1393         if (target->obd_replayable)
1394                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1395
1396         if (export == NULL) {
1397                 /* allow lightweight connections during recovery */
1398                 /*
1399                  * allow "new" MDT to be connected during recovery, since we
1400                  * need retrieve recovery update records from it
1401                  */
1402                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1403                         struct hrtimer *timer = &target->obd_recovery_timer;
1404                         ktime_t remaining;
1405                         s64 timeout, left;
1406                         int in_progress;
1407                         int connected;
1408                         int known;
1409                         int stale;
1410                         char *msg;
1411
1412                         connected = atomic_read(&target->obd_connected_clients);
1413                         in_progress = atomic_read(&target->obd_lock_replay_clients);
1414                         known =
1415                            atomic_read(&target->obd_max_recoverable_clients);
1416                         stale = target->obd_stale_clients;
1417                         remaining = hrtimer_get_remaining(timer);
1418                         left = ktime_divns(remaining, NSEC_PER_SEC);
1419
1420                         if (ktime_to_ns(remaining) > 0) {
1421                                 msg = "to recover in";
1422                                 timeout = left;
1423                         } else {
1424                                 msg = "already passed deadline";
1425                                 timeout = -left;
1426
1427                                 target_check_recovery_timer(target);
1428                         }
1429
1430                         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",
1431                                       target->obd_name, cluuid.uuid,
1432                                       libcfs_nidstr(&req->rq_peer.nid), known,
1433                                       connected - in_progress, in_progress,
1434                                       stale, msg, timeout / 60, timeout % 60);
1435                         rc = -EBUSY;
1436                 } else {
1437 dont_check_exports:
1438                         rc = obd_connect(req->rq_svc_thread->t_env,
1439                                          &export, target, &cluuid, data,
1440                                          &req->rq_peer.nid);
1441                         if (mds_conn && CFS_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1442                                 lustre_msg_add_op_flags(req->rq_repmsg,
1443                                                         MSG_CONNECT_RECOVERING);
1444                         if (rc == 0) {
1445                                 conn.cookie = export->exp_handle.h_cookie;
1446                                 rc = rev_import_init(export);
1447                         }
1448
1449                         if (mds_mds_conn)
1450                                 new_mds_mds_conn = true;
1451                 }
1452         } else {
1453                 if (CFS_FAIL_CHECK(OBD_FAIL_MDS_CONNECT_VS_EVICT)) {
1454                         class_export_get(export);
1455                         class_fail_export(export);
1456                         class_export_put(export);
1457                 }
1458                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1459                                    export, target, &cluuid, data,
1460                                    &req->rq_peer.nid);
1461                 if (rc == 0)
1462                         reconnected = true;
1463         }
1464         if (rc)
1465                 GOTO(out, rc);
1466
1467         data->ocd_instance = obd2obt(target)->obt_instance;
1468
1469         /*
1470          * Return only the parts of obd_connect_data that we understand, so the
1471          * client knows that we don't understand the rest.
1472          */
1473         if (data) {
1474                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1475                                                RCL_SERVER);
1476                 tmpdata = req_capsule_server_get(&req->rq_pill,
1477                                                  &RMF_CONNECT_DATA);
1478                 /*
1479                  * Don't use struct assignment here, because the client reply
1480                  * buffer may be smaller/larger than the local struct
1481                  * obd_connect_data.
1482                  */
1483                 memcpy(tmpdata, data, min(tmpsize, size));
1484         }
1485
1486         /*
1487          * If the client and the server are the same node, we will already
1488          * have an export that really points to the client's DLM export,
1489          * because we have a shared handles table.
1490          *
1491          * XXX this will go away when shaver stops sending the "connect" handle
1492          * in the real "remote handle" field of the request --phik 24 Apr 2003
1493          */
1494         ptlrpc_request_change_export(req, export);
1495
1496         pcon = ptlrpc_connection_get(&req->rq_peer,
1497                                      &req->rq_self, &cluuid);
1498         if (pcon == NULL)
1499                 GOTO(out, rc = -ENOTCONN);
1500
1501         spin_lock(&export->exp_lock);
1502
1503         if (export->exp_disconnected) {
1504                 spin_unlock(&export->exp_lock);
1505                 if (reconnected) {
1506                         /*
1507                          * for each connect called disconnect
1508                          * should be called to cleanup stuff
1509                          */
1510                         class_export_get(export);
1511                         obd_disconnect(export);
1512                 }
1513
1514                 GOTO(out, rc = -ENODEV);
1515         }
1516         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1517                 spin_unlock(&export->exp_lock);
1518                 CDEBUG(D_RPCTRACE,
1519                        "%s: %s already connected at greater or equal conn_cnt: %d >= %d\n",
1520                        cluuid.uuid, libcfs_nidstr(&req->rq_peer.nid),
1521                        export->exp_conn_cnt,
1522                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1523
1524                 GOTO(out, rc = -EALREADY);
1525         }
1526         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1527         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1528
1529 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1530         /* make 'tmp_exp_old_falloc' persistent by saving it into
1531          * server side export object(obd_export)
1532          */
1533         export->exp_old_falloc = tmp_exp_old_falloc;
1534 #endif
1535
1536         /* Check to see if connection came from another NID. */
1537         if (export->exp_connection != NULL &&
1538             !nid_same(&export->exp_connection->c_peer.nid,
1539                       &req->rq_peer.nid)) {
1540                 obd_nid_del(export->exp_obd, export);
1541                 ptlrpc_connection_put(export->exp_connection);
1542                 export->exp_connection = NULL;
1543         }
1544
1545         if (export->exp_connection == NULL) {
1546                 export->exp_connection = pcon;
1547                 pcon = NULL;
1548         }
1549         obd_nid_add(export->exp_obd, export);
1550
1551         spin_unlock(&export->exp_lock);
1552
1553         lustre_msg_set_handle(req->rq_repmsg, &conn);
1554
1555         rc = rev_import_reconnect(export, req);
1556         if (rc != 0)
1557                 GOTO(out, rc);
1558
1559         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1560                 int has_transno;
1561                 __u64 transno = data->ocd_transno;
1562
1563                 spin_lock(&export->exp_lock);
1564                 /*
1565                  * possible race with class_disconnect_stale_exports,
1566                  * export may be already in the eviction process
1567                  */
1568                 if (export->exp_failed) {
1569                         spin_unlock(&export->exp_lock);
1570                         GOTO(out, rc = -ENODEV);
1571                 }
1572                 export->exp_in_recovery = 1;
1573                 export->exp_req_replay_needed = 1;
1574                 export->exp_lock_replay_needed = 1;
1575                 spin_unlock(&export->exp_lock);
1576
1577                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1578                                  MSG_CONNECT_TRANSNO);
1579                 if (has_transno && transno == 0)
1580                         CWARN("Connect with zero transno!\n");
1581
1582                 if (has_transno && transno > 0 &&
1583                     transno < target->obd_next_recovery_transno &&
1584                     transno > target->obd_last_committed) {
1585                         /* Another way is to use cmpxchg() to be lock-free. */
1586                         spin_lock(&target->obd_recovery_task_lock);
1587                         if (transno < target->obd_next_recovery_transno)
1588                                 target->obd_next_recovery_transno = transno;
1589                         spin_unlock(&target->obd_recovery_task_lock);
1590                 }
1591
1592                 atomic_inc(&target->obd_req_replay_clients);
1593                 atomic_inc(&target->obd_lock_replay_clients);
1594                 /*
1595                  * Note: MDS-MDS connection is allowed to be connected during
1596                  * recovery, no matter if the exports needs to be recoveried.
1597                  * Because we need retrieve updates logs from all other MDTs.
1598                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1599                  * also needs to be increased to match other recovery checking
1600                  * condition.
1601                  */
1602                 if (new_mds_mds_conn)
1603                         atomic_inc(&target->obd_max_recoverable_clients);
1604
1605                 if (atomic_inc_return(&target->obd_connected_clients) ==
1606                     atomic_read(&target->obd_max_recoverable_clients))
1607                         wake_up(&target->obd_next_transno_waitq);
1608         }
1609
1610         /* Tell the client we're in recovery, when client is involved in it. */
1611         if (target->obd_recovering && !lw_client)
1612                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1613
1614 out:
1615         if (export) {
1616                 spin_lock(&export->exp_lock);
1617                 export->exp_connecting = 0;
1618                 spin_unlock(&export->exp_lock);
1619
1620                 class_export_put(export);
1621         }
1622         if (target != NULL) {
1623                 spin_lock(&target->obd_dev_lock);
1624                 target->obd_conn_inprogress--;
1625                 spin_unlock(&target->obd_dev_lock);
1626                 class_decref(target, "find", current);
1627         }
1628         if (pcon)
1629                 ptlrpc_connection_put(pcon);
1630         req->rq_status = rc;
1631         RETURN(rc);
1632 }
1633
1634 int target_handle_disconnect(struct ptlrpc_request *req)
1635 {
1636         int rc;
1637
1638         ENTRY;
1639
1640         rc = req_capsule_server_pack(&req->rq_pill);
1641         if (rc)
1642                 RETURN(rc);
1643
1644         /* In case of target disconnect, updating sec ctx immediately is
1645          * required in order to record latest sequence number used.
1646          * Sequence is normally updated on export destroy, but this event
1647          * can occur too late, ie after a new target connect request has
1648          * been processed.
1649          * Maintaining correct sequence when client connection becomes idle
1650          * ensures that GSS does not erroneously consider requests as replays.
1651          */
1652         rc = sptlrpc_export_update_ctx(req->rq_export);
1653         if (rc)
1654                 RETURN(rc);
1655
1656         /* Keep the rq_export around so we can send the reply. */
1657         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1658
1659         RETURN(0);
1660 }
1661
1662 void target_destroy_export(struct obd_export *exp)
1663 {
1664         struct obd_import *imp = NULL;
1665         /*
1666          * exports created from last_rcvd data, and "fake"
1667          * exports created by lctl don't have an import
1668          */
1669         spin_lock(&exp->exp_lock);
1670         if (exp->exp_imp_reverse != NULL) {
1671                 imp = exp->exp_imp_reverse;
1672                 exp->exp_imp_reverse = NULL;
1673         }
1674         spin_unlock(&exp->exp_lock);
1675         if (imp != NULL)
1676                 client_destroy_import(imp);
1677
1678         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1679         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1680         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1681         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1682 }
1683 EXPORT_SYMBOL(target_destroy_export);
1684
1685 /*
1686  * Recovery functions
1687  */
1688 static void target_request_copy_get(struct ptlrpc_request *req)
1689 {
1690         class_export_rpc_inc(req->rq_export);
1691         LASSERT(list_empty(&req->rq_list));
1692         INIT_LIST_HEAD(&req->rq_replay_list);
1693
1694         /* Increase refcount to keep request in queue. */
1695         atomic_inc(&req->rq_refcount);
1696         /* Let export know it has replays to be handled. */
1697         atomic_inc(&req->rq_export->exp_replay_count);
1698 }
1699
1700 static void target_request_copy_put(struct ptlrpc_request *req)
1701 {
1702         LASSERT(list_empty(&req->rq_replay_list));
1703         LASSERT(atomic_read(&(req)->rq_export->exp_replay_count) > 0);
1704
1705         atomic_dec(&req->rq_export->exp_replay_count);
1706         class_export_rpc_dec(req->rq_export);
1707         ptlrpc_server_drop_request(req);
1708 }
1709
1710 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1711 {
1712         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1713         struct obd_export *exp = req->rq_export;
1714         struct ptlrpc_request *reqiter;
1715         struct ptlrpc_request *dup_req = NULL;
1716         int dup = 0;
1717
1718         LASSERT(exp);
1719
1720         spin_lock(&exp->exp_lock);
1721         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1722                             rq_replay_list) {
1723                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1724                         dup_req = reqiter;
1725                         dup = 1;
1726                         break;
1727                 }
1728         }
1729
1730         if (dup) {
1731                 /* We expect it with RESENT and REPLAY flags. */
1732                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1733                     (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1734                         CERROR("invalid flags %x of resent replay\n",
1735                                lustre_msg_get_flags(req->rq_reqmsg));
1736
1737                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1738                         __u32 new_conn;
1739
1740                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1741                         if (new_conn >
1742                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1743                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1744                                                         new_conn);
1745                 }
1746         } else {
1747                 list_add_tail(&req->rq_replay_list,
1748                               &exp->exp_req_replay_queue);
1749         }
1750
1751         spin_unlock(&exp->exp_lock);
1752         return dup;
1753 }
1754
1755 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1756 {
1757         LASSERT(!list_empty(&req->rq_replay_list));
1758         LASSERT(req->rq_export);
1759
1760         spin_lock(&req->rq_export->exp_lock);
1761         list_del_init(&req->rq_replay_list);
1762         spin_unlock(&req->rq_export->exp_lock);
1763 }
1764
1765 static void target_finish_recovery(struct lu_target *lut)
1766 {
1767         struct obd_device *obd = lut->lut_obd;
1768
1769         ENTRY;
1770
1771         /* Only log a recovery message when recovery has occurred. */
1772         if (obd->obd_recovery_start) {
1773                 time64_t now = ktime_get_seconds();
1774                 time64_t elapsed_time;
1775
1776                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start,
1777                                      1);
1778                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients %d recovered and %d %s evicted.\n",
1779                               obd->obd_name, elapsed_time / 60,
1780                               elapsed_time % 60,
1781                               atomic_read(&obd->obd_max_recoverable_clients),
1782                               atomic_read(&obd->obd_connected_clients),
1783                               obd->obd_stale_clients,
1784                               obd->obd_stale_clients == 1 ? "was" : "were");
1785                 if (obd->obd_stale_clients && do_dump_on_eviction(obd))
1786                         libcfs_debug_dumplog();
1787         }
1788
1789         ldlm_reprocess_recovery_done(obd->obd_namespace);
1790         spin_lock(&obd->obd_recovery_task_lock);
1791         if (!list_empty(&obd->obd_req_replay_queue) ||
1792             !list_empty(&obd->obd_lock_replay_queue) ||
1793             !list_empty(&obd->obd_final_req_queue)) {
1794                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1795                        obd->obd_name,
1796                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1797                        list_empty(&obd->obd_lock_replay_queue) ? \
1798                                   "" : "lock ",
1799                        list_empty(&obd->obd_final_req_queue) ? \
1800                                   "" : "final ");
1801                 spin_unlock(&obd->obd_recovery_task_lock);
1802                 LBUG();
1803         }
1804         spin_unlock(&obd->obd_recovery_task_lock);
1805
1806         obd->obd_recovery_end = ktime_get_seconds();
1807
1808         /* When recovery finished, cleanup orphans on MDS and OST. */
1809         if (obd->obd_type && OBP(obd, postrecov)) {
1810                 int rc = OBP(obd, postrecov)(obd);
1811
1812                 if (rc < 0)
1813                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1814                                       obd->obd_name, rc);
1815         }
1816         EXIT;
1817 }
1818
1819 static void abort_req_replay_queue(struct obd_device *obd)
1820 {
1821         struct ptlrpc_request *req, *n;
1822         LIST_HEAD(abort_list);
1823
1824         spin_lock(&obd->obd_recovery_task_lock);
1825         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1826         spin_unlock(&obd->obd_recovery_task_lock);
1827         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1828                 DEBUG_REQ(D_WARNING, req, "aborted:");
1829                 req->rq_status = -ENOTCONN;
1830                 if (ptlrpc_error(req)) {
1831                         DEBUG_REQ(D_ERROR, req,
1832                                   "failed abort_req_reply; skipping");
1833                 }
1834                 target_exp_dequeue_req_replay(req);
1835                 target_request_copy_put(req);
1836         }
1837 }
1838
1839 static void abort_lock_replay_queue(struct obd_device *obd)
1840 {
1841         struct ptlrpc_request *req, *n;
1842         LIST_HEAD(abort_list);
1843
1844         spin_lock(&obd->obd_recovery_task_lock);
1845         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1846         spin_unlock(&obd->obd_recovery_task_lock);
1847         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1848                 DEBUG_REQ(D_ERROR, req, "aborted:");
1849                 req->rq_status = -ENOTCONN;
1850                 if (ptlrpc_error(req)) {
1851                         DEBUG_REQ(D_ERROR, req,
1852                                   "failed abort_lock_reply; skipping");
1853                 }
1854                 target_request_copy_put(req);
1855         }
1856 }
1857
1858 /*
1859  * Called from a cleanup function if the device is being cleaned up
1860  * forcefully.  The exports should all have been disconnected already,
1861  * the only thing left to do is
1862  * - clear the recovery flags
1863  * - cancel the timer
1864  * - free queued requests and replies, but don't send replies
1865  * Because the obd_stopping flag is set, no new requests should be received.
1866  */
1867 void target_cleanup_recovery(struct obd_device *obd)
1868 {
1869         struct ptlrpc_request *req, *n;
1870         LIST_HEAD(clean_list);
1871
1872         spin_lock(&obd->obd_dev_lock);
1873         if (!obd->obd_recovering) {
1874                 spin_unlock(&obd->obd_dev_lock);
1875                 EXIT;
1876                 return;
1877         }
1878         obd->obd_recovering = 0;
1879         obd->obd_abort_recovery = 0;
1880         obd->obd_abort_mdt_recovery = 0;
1881         spin_unlock(&obd->obd_dev_lock);
1882
1883         spin_lock(&obd->obd_recovery_task_lock);
1884         target_cancel_recovery_timer(obd);
1885         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1886         spin_unlock(&obd->obd_recovery_task_lock);
1887
1888         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1889                 LASSERT(req->rq_reply_state == NULL);
1890                 target_exp_dequeue_req_replay(req);
1891                 target_request_copy_put(req);
1892         }
1893
1894         spin_lock(&obd->obd_recovery_task_lock);
1895         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1896         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1897         spin_unlock(&obd->obd_recovery_task_lock);
1898
1899         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1900                 LASSERT(req->rq_reply_state == NULL);
1901                 target_request_copy_put(req);
1902         }
1903
1904         EXIT;
1905 }
1906 EXPORT_SYMBOL(target_cleanup_recovery);
1907
1908 /* obd_recovery_task_lock should be held */
1909 void target_cancel_recovery_timer(struct obd_device *obd)
1910 {
1911         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1912         hrtimer_cancel(&obd->obd_recovery_timer);
1913 }
1914
1915 static void target_start_recovery_timer(struct obd_device *obd)
1916 {
1917         ktime_t delay;
1918
1919         if (obd->obd_recovery_start != 0)
1920                 return;
1921
1922         spin_lock(&obd->obd_dev_lock);
1923         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1924                 spin_unlock(&obd->obd_dev_lock);
1925                 return;
1926         }
1927
1928         LASSERT(obd->obd_recovery_timeout != 0);
1929
1930         if (obd->obd_recovery_start != 0) {
1931                 spin_unlock(&obd->obd_dev_lock);
1932                 return;
1933         }
1934
1935         obd->obd_recovery_start = ktime_get_seconds();
1936         delay = ktime_set(obd->obd_recovery_start +
1937                           obd->obd_recovery_timeout, 0);
1938         hrtimer_start(&obd->obd_recovery_timer, delay, HRTIMER_MODE_ABS);
1939         spin_unlock(&obd->obd_dev_lock);
1940
1941         LCONSOLE_WARN("%s: Will be in recovery for at least %u:%02u, or until %d client%s reconnect%s\n",
1942                       obd->obd_name,
1943                       obd->obd_recovery_timeout / 60,
1944                       obd->obd_recovery_timeout % 60,
1945                       atomic_read(&obd->obd_max_recoverable_clients),
1946                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1947                       "" : "s",
1948                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1949                       "s" : "");
1950 }
1951
1952 /**
1953  * extend recovery window.
1954  *
1955  * if @extend is true, extend recovery window to have @dr_timeout remaining
1956  * at least; otherwise, make sure the recovery timeout value is not less
1957  * than @dr_timeout.
1958  */
1959 static void extend_recovery_timer(struct obd_device *obd, timeout_t dr_timeout,
1960                                   bool extend)
1961 {
1962         ktime_t left_ns;
1963         timeout_t timeout;
1964         timeout_t left;
1965
1966         spin_lock(&obd->obd_dev_lock);
1967         if (!obd->obd_recovering || obd->obd_abort_recovery ||
1968             obd->obd_stopping) {
1969                 spin_unlock(&obd->obd_dev_lock);
1970                 return;
1971         }
1972         LASSERT(obd->obd_recovery_start != 0);
1973
1974         left_ns = hrtimer_get_remaining(&obd->obd_recovery_timer);
1975         left = ktime_divns(left_ns, NSEC_PER_SEC);
1976
1977         if (extend) {
1978                 timeout = obd->obd_recovery_timeout;
1979                 /* dr_timeout will happen after the hrtimer has expired.
1980                  * Add the excess time to the soft recovery timeout without
1981                  * exceeding the hard recovery timeout.
1982                  */
1983                 if (dr_timeout > left) {
1984                         timeout += dr_timeout - left;
1985                         timeout = min_t(timeout_t, obd->obd_recovery_time_hard,
1986                                         timeout);
1987                 }
1988         } else {
1989                 timeout = clamp_t(timeout_t, dr_timeout,
1990                                   obd->obd_recovery_timeout,
1991                                   obd->obd_recovery_time_hard);
1992         }
1993
1994         if (timeout == obd->obd_recovery_time_hard)
1995                 CWARN("%s: extended recovery timer reached hard limit: %d, extend: %d\n",
1996                       obd->obd_name, timeout, extend);
1997
1998         if (obd->obd_recovery_timeout < timeout) {
1999                 ktime_t end, now;
2000
2001                 obd->obd_recovery_timeout = timeout;
2002                 end = ktime_set(obd->obd_recovery_start + timeout, 0);
2003                 now = ktime_set(ktime_get_seconds(), 0);
2004                 left_ns = ktime_sub(end, now);
2005                 hrtimer_start(&obd->obd_recovery_timer, end, HRTIMER_MODE_ABS);
2006                 left = ktime_divns(left_ns, NSEC_PER_SEC);
2007         }
2008         spin_unlock(&obd->obd_dev_lock);
2009
2010         CDEBUG(D_HA, "%s: recovery timer will expire in %d seconds\n",
2011                 obd->obd_name, left);
2012 }
2013
2014 /* Reset the timer with each new client connection */
2015 /*
2016  * This timer is actually reconnect_timer, which is for making sure
2017  * the total recovery window is at least as big as my reconnect
2018  * attempt timing. So the initial recovery time_out will be set to
2019  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
2020  * from client is bigger than this, then the recovery time_out will
2021  * be extended to make sure the client could be reconnected, in the
2022  * process, the timeout from the new client should be ignored.
2023  */
2024 static void
2025 check_and_start_recovery_timer(struct obd_device *obd,
2026                                struct ptlrpc_request *req,
2027                                int new_client)
2028 {
2029         timeout_t service_timeout = lustre_msg_get_service_timeout(req->rq_reqmsg);
2030         struct obd_device_target *obt = obd2obt(obd);
2031
2032         if (!new_client && service_timeout)
2033                 /*
2034                  * Teach server about old server's estimates, as first guess
2035                  * at how long new requests will take.
2036                  */
2037                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
2038                             service_timeout);
2039
2040         target_start_recovery_timer(obd);
2041
2042         /*
2043          * Convert the service time to RPC timeout,
2044          * and reuse service_timeout to limit stack usage.
2045          */
2046         service_timeout = at_est2timeout(service_timeout);
2047
2048         if (CFS_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
2049             service_timeout < at_extra)
2050                 service_timeout = at_extra;
2051
2052         /*
2053          * We expect other clients to timeout within service_timeout, then try
2054          * to reconnect, then try the failover server.  The max delay between
2055          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL.
2056          */
2057         service_timeout += 2 * INITIAL_CONNECT_TIMEOUT;
2058
2059         LASSERT(obt->obt_magic == OBT_MAGIC);
2060         service_timeout += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
2061         if (service_timeout > obd->obd_recovery_timeout && !new_client)
2062                 extend_recovery_timer(obd, service_timeout, false);
2063 }
2064
2065 /** Health checking routines */
2066 static inline int exp_connect_healthy(struct obd_export *exp)
2067 {
2068         return exp->exp_in_recovery;
2069 }
2070
2071 /** if export done req_replay or has replay in queue */
2072 static inline int exp_req_replay_healthy(struct obd_export *exp)
2073 {
2074         return (!exp->exp_req_replay_needed ||
2075                 atomic_read(&exp->exp_replay_count) > 0);
2076 }
2077
2078
2079 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
2080 {
2081         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
2082                exp_req_replay_healthy(exp);
2083 }
2084
2085 /** if export done lock_replay or has replay in queue */
2086 static inline int exp_lock_replay_healthy(struct obd_export *exp)
2087 {
2088         return (!exp->exp_lock_replay_needed ||
2089                 atomic_read(&exp->exp_replay_count) > 0);
2090 }
2091
2092 static inline int exp_vbr_healthy(struct obd_export *exp)
2093 {
2094         return !exp->exp_vbr_failed;
2095 }
2096
2097 static inline int exp_finished(struct obd_export *exp)
2098 {
2099         return exp->exp_in_recovery && !exp->exp_lock_replay_needed;
2100 }
2101
2102 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
2103 {
2104         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
2105                 exp_finished(exp);
2106 }
2107
2108 static int check_for_next_transno(struct lu_target *lut)
2109 {
2110         struct ptlrpc_request *req = NULL;
2111         struct obd_device *obd = lut->lut_obd;
2112         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2113         int wake_up = 0, connected, completed, queue_len;
2114         __u64 req_transno = 0;
2115         __u64 update_transno = 0;
2116         __u64 next_transno = 0;
2117
2118         ENTRY;
2119
2120         spin_lock(&obd->obd_recovery_task_lock);
2121         if (!list_empty(&obd->obd_req_replay_queue)) {
2122                 req = list_first_entry(&obd->obd_req_replay_queue,
2123                                        struct ptlrpc_request, rq_list);
2124                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
2125         }
2126
2127         if (!obd_mdt_recovery_abort(obd) && tdtd)
2128                 update_transno = distribute_txn_get_next_transno(tdtd);
2129
2130         connected = atomic_read(&obd->obd_connected_clients);
2131         completed = connected - atomic_read(&obd->obd_req_replay_clients);
2132         queue_len = obd->obd_requests_queued_for_recovery;
2133         next_transno = obd->obd_next_recovery_transno;
2134
2135         CDEBUG(D_HA,
2136                "max: %d, connected: %d, completed: %d, queue_len: %d, req_transno: %llu, next_transno: %llu\n",
2137                atomic_read(&obd->obd_max_recoverable_clients),
2138                connected, completed,
2139                queue_len, req_transno, next_transno);
2140
2141         if (obd_recovery_abort(obd)) {
2142                 CDEBUG(D_HA, "waking for aborted recovery\n");
2143                 wake_up = 1;
2144         } else if (obd->obd_recovery_expired) {
2145                 CDEBUG(D_HA, "waking for expired recovery\n");
2146                 wake_up = 1;
2147         } else if (!obd_mdt_recovery_abort(obd) && tdtd && req &&
2148                    is_req_replayed_by_update(req)) {
2149                 LASSERTF(req_transno < next_transno,
2150                          "req_transno %llu next_transno%llu\n", req_transno,
2151                          next_transno);
2152                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
2153                        req_transno);
2154                 wake_up = 1;
2155         } else if (req_transno == next_transno ||
2156                    (update_transno != 0 && update_transno <= next_transno)) {
2157                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
2158                 wake_up = 1;
2159         } else if (queue_len > 0 &&
2160                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
2161                 /** handle gaps occured due to lost reply or VBR */
2162                 LASSERTF(req_transno >= next_transno,
2163                          "req_transno: %llu, next_transno: %llu\n",
2164                          req_transno, next_transno);
2165                 CDEBUG(D_HA,
2166                        "%s: waking for gap in transno, VBR is %s (skip: %lld, ql: %d, comp: %d, conn: %d, next: %lld, next_update %lld last_committed: %lld)\n",
2167                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
2168                        next_transno, queue_len, completed, connected,
2169                        req_transno, update_transno, obd->obd_last_committed);
2170                 obd->obd_next_recovery_transno = req_transno;
2171                 wake_up = 1;
2172         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
2173                 CDEBUG(D_HA, "waking for completed recovery\n");
2174                 wake_up = 1;
2175         } else if (CFS_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
2176                 CDEBUG(D_HA,
2177                        "accepting transno gaps is explicitly allowed by fail_lock, waking up (%lld)\n",
2178                        next_transno);
2179                 obd->obd_next_recovery_transno = req_transno;
2180                 wake_up = 1;
2181         }
2182         spin_unlock(&obd->obd_recovery_task_lock);
2183         return wake_up;
2184 }
2185
2186 static int check_for_next_lock(struct lu_target *lut)
2187 {
2188         struct obd_device *obd = lut->lut_obd;
2189         int wake_up = 0;
2190
2191         spin_lock(&obd->obd_recovery_task_lock);
2192         if (!list_empty(&obd->obd_lock_replay_queue)) {
2193                 CDEBUG(D_HA, "waking for next lock\n");
2194                 wake_up = 1;
2195         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
2196                 CDEBUG(D_HA, "waking for completed lock replay\n");
2197                 wake_up = 1;
2198         } else if (obd->obd_abort_recovery) {
2199                 CDEBUG(D_HA, "waking for aborted recovery\n");
2200                 wake_up = 1;
2201         } else if (obd->obd_recovery_expired) {
2202                 CDEBUG(D_HA, "waking for expired recovery\n");
2203                 wake_up = 1;
2204         }
2205         spin_unlock(&obd->obd_recovery_task_lock);
2206
2207         return wake_up;
2208 }
2209
2210 static int check_update_llog(struct lu_target *lut)
2211 {
2212         struct obd_device *obd = lut->lut_obd;
2213         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2214
2215         if (obd_mdt_recovery_abort(obd)) {
2216                 CDEBUG(D_HA, "waking for aborted recovery\n");
2217                 return 1;
2218         }
2219
2220         if (atomic_read(&tdtd->tdtd_recovery_threads_count) == 0) {
2221                 CDEBUG(D_HA, "waking for completion of reading update log\n");
2222                 return 1;
2223         }
2224
2225         return 0;
2226 }
2227
2228 /**
2229  * wait for recovery events,
2230  * check its status with help of check_routine
2231  * evict dead clients via health_check
2232  */
2233 static int target_recovery_overseer(struct lu_target *lut,
2234                                     int (*check_routine)(struct lu_target *),
2235                                     int (*health_check)(struct obd_export *))
2236 {
2237         struct obd_device *obd = lut->lut_obd;
2238         struct target_distribute_txn_data *tdtd;
2239         time64_t last = 0;
2240         time64_t now;
2241 repeat:
2242         if (obd->obd_recovering && obd->obd_recovery_start == 0) {
2243                 now = ktime_get_seconds();
2244                 if (now - last > 600) {
2245                         LCONSOLE_INFO("%s: in recovery but waiting for the first client to connect\n",
2246                                       obd->obd_name);
2247                         last = now;
2248                 }
2249         }
2250         if (obd->obd_recovery_start != 0 && ktime_get_seconds() >=
2251               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
2252                 __u64 next_update_transno = 0;
2253
2254                 /*
2255                  * Only abort the recovery if there are no update recovery
2256                  * left in the queue
2257                  */
2258                 spin_lock(&obd->obd_recovery_task_lock);
2259                 if (!obd_mdt_recovery_abort(obd) && lut->lut_tdtd) {
2260                         next_update_transno =
2261                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2262
2263                         tdtd = lut->lut_tdtd;
2264                         /*
2265                          * If next_update_transno == 0, it probably because
2266                          * updatelog retrieve threads did not get any records
2267                          * yet, let's wait those threads stopped
2268                          */
2269                         if (next_update_transno == 0) {
2270                                 spin_unlock(&obd->obd_recovery_task_lock);
2271
2272                                 while (wait_event_timeout(
2273                                         tdtd->tdtd_recovery_threads_waitq,
2274                                         check_update_llog(lut),
2275                                         cfs_time_seconds(60)) == 0);
2276
2277                                 spin_lock(&obd->obd_recovery_task_lock);
2278                                 next_update_transno =
2279                                         distribute_txn_get_next_transno(tdtd);
2280                         }
2281                 }
2282
2283                 if (next_update_transno != 0 && !obd_recovery_abort(obd)) {
2284                         obd->obd_next_recovery_transno = next_update_transno;
2285                         spin_unlock(&obd->obd_recovery_task_lock);
2286                         /*
2287                          * Disconnect unfinished exports from clients, and
2288                          * keep connection from MDT to make sure the update
2289                          * recovery will still keep trying until some one
2290                          * manually abort the recovery
2291                          */
2292                         class_disconnect_stale_exports(obd,
2293                                                 exp_finished_or_from_mdt);
2294                         /* Abort all of replay & replay lock req from clients */
2295                         abort_req_replay_queue(obd);
2296                         abort_lock_replay_queue(obd);
2297                         CDEBUG(D_HA,
2298                                "%s: there are still update replay (%#llx)in the queue.\n",
2299                                obd->obd_name, next_update_transno);
2300                 } else {
2301                         obd->obd_abort_recovery = 1;
2302                         spin_unlock(&obd->obd_recovery_task_lock);
2303                         CWARN("%s recovery is aborted by hard timeout\n",
2304                               obd->obd_name);
2305                 }
2306         }
2307
2308         while (wait_event_timeout(obd->obd_next_transno_waitq,
2309                                   check_routine(lut),
2310                                   cfs_time_seconds(60)) == 0)
2311                 ; /* wait indefinitely for event, but don't trigger watchdog */
2312
2313         if (obd_recovery_abort(obd)) {
2314                 CWARN("recovery is aborted, evict exports in recovery\n");
2315                 if (lut->lut_tdtd != NULL) {
2316                         tdtd = lut->lut_tdtd;
2317                         /*
2318                          * Let's wait all of the update log recovery thread
2319                          * finished
2320                          */
2321                         wait_event_idle(
2322                                 tdtd->tdtd_recovery_threads_waitq,
2323                                 atomic_read(&tdtd->tdtd_recovery_threads_count)
2324                                 == 0);
2325                         /* Then abort the update recovery list */
2326                         dtrq_list_destroy(lut->lut_tdtd);
2327                 }
2328
2329                 /** evict exports which didn't finish recovery yet */
2330                 class_disconnect_stale_exports(obd, exp_finished);
2331                 return 1;
2332         } else if (obd->obd_recovery_expired) {
2333                 obd->obd_recovery_expired = 0;
2334
2335                 /** If some clients died being recovered, evict them */
2336                 LCONSOLE_WARN("%s: recovery is timed out, evict stale exports\n",
2337                               obd->obd_name);
2338                 /** evict cexports with no replay in queue, they are stalled */
2339                 class_disconnect_stale_exports(obd, health_check);
2340
2341                 /** continue with VBR */
2342                 spin_lock(&obd->obd_dev_lock);
2343                 obd->obd_version_recov = 1;
2344                 spin_unlock(&obd->obd_dev_lock);
2345                 /**
2346                  * reset timer, recovery will proceed with versions now,
2347                  * timeout is set just to handle reconnection delays
2348                  */
2349                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2350                 /**
2351                  * Wait for recovery events again, after evicting bad clients
2352                  */
2353                 goto repeat;
2354         }
2355         return 0;
2356 }
2357
2358 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2359 {
2360         struct obd_device *obd = lut->lut_obd;
2361         struct ptlrpc_request *req = NULL;
2362
2363         CDEBUG(D_HA, "Waiting for lock\n");
2364         if (target_recovery_overseer(lut, check_for_next_lock,
2365                                      exp_lock_replay_healthy))
2366                 abort_lock_replay_queue(obd);
2367
2368         spin_lock(&obd->obd_recovery_task_lock);
2369         if (!list_empty(&obd->obd_lock_replay_queue)) {
2370                 req = list_first_entry(&obd->obd_lock_replay_queue,
2371                                        struct ptlrpc_request, rq_list);
2372                 list_del_init(&req->rq_list);
2373                 spin_unlock(&obd->obd_recovery_task_lock);
2374         } else {
2375                 spin_unlock(&obd->obd_recovery_task_lock);
2376                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2377                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2378                 /** evict exports failed VBR */
2379                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2380         }
2381         return req;
2382 }
2383
2384 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2385 {
2386         struct ptlrpc_request *req = NULL;
2387
2388         spin_lock(&obd->obd_recovery_task_lock);
2389         if (!list_empty(&obd->obd_final_req_queue)) {
2390                 req = list_first_entry(&obd->obd_final_req_queue,
2391                                        struct ptlrpc_request, rq_list);
2392                 list_del_init(&req->rq_list);
2393                 spin_unlock(&obd->obd_recovery_task_lock);
2394                 if (req->rq_export->exp_in_recovery) {
2395                         spin_lock(&req->rq_export->exp_lock);
2396                         req->rq_export->exp_in_recovery = 0;
2397                         spin_unlock(&req->rq_export->exp_lock);
2398                 }
2399         } else {
2400                 spin_unlock(&obd->obd_recovery_task_lock);
2401         }
2402         return req;
2403 }
2404
2405 static void handle_recovery_req(struct ptlrpc_thread *thread,
2406                                 struct ptlrpc_request *req,
2407                                 svc_handler_t handler)
2408 {
2409         ENTRY;
2410
2411         /**
2412          * export can be evicted during recovery, no need to handle replays for
2413          * it after that, discard such request silently
2414          */
2415         if (req->rq_export->exp_disconnected)
2416                 RETURN_EXIT;
2417
2418         req->rq_session.lc_thread = thread;
2419         req->rq_svc_thread = thread;
2420         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2421
2422         /* thread context */
2423         lu_context_enter(&thread->t_env->le_ctx);
2424         (void)handler(req);
2425         lu_context_exit(&thread->t_env->le_ctx);
2426
2427         req->rq_svc_thread->t_env->le_ses = NULL;
2428
2429         /* don't reset timer for final stage */
2430         if (!exp_finished(req->rq_export)) {
2431                 timeout_t timeout = obd_timeout;
2432
2433                 /**
2434                  * Add request @timeout to the recovery time so next request from
2435                  * this client may come in recovery time
2436                  */
2437                 if (!AT_OFF) {
2438                         struct ptlrpc_service_part *svcpt;
2439                         timeout_t est_timeout;
2440
2441                         svcpt = req->rq_rqbd->rqbd_svcpt;
2442                         /*
2443                          * If the server sent early reply for this request,
2444                          * the client will recalculate the timeout according to
2445                          * current server estimate service time, so we will
2446                          * use the maxium timeout here for waiting the client
2447                          * sending the next req
2448                          */
2449                         est_timeout = at_get(&svcpt->scp_at_estimate);
2450                         timeout = max_t(timeout_t, at_est2timeout(est_timeout),
2451                                         lustre_msg_get_timeout(req->rq_reqmsg));
2452                         /*
2453                          * Add 2 net_latency, one for balance rq_deadline
2454                          * (see ptl_send_rpc), one for resend the req to server,
2455                          * Note: client will pack net_latency in replay req
2456                          * (see ptlrpc_replay_req)
2457                          */
2458                         timeout += 2 * lustre_msg_get_service_timeout(req->rq_reqmsg);
2459                 }
2460                 extend_recovery_timer(class_exp2obd(req->rq_export), timeout,
2461                                       true);
2462         }
2463         EXIT;
2464 }
2465
2466 /** Checking routines for recovery */
2467 static int check_for_recovery_ready(struct lu_target *lut)
2468 {
2469         struct obd_device *obd = lut->lut_obd;
2470         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2471
2472         CDEBUG(D_HA,
2473                "connected %d stale %d max_recoverable_clients %d abort %d expired %d\n",
2474                clnts, obd->obd_stale_clients,
2475                atomic_read(&obd->obd_max_recoverable_clients),
2476                obd->obd_abort_recovery, obd->obd_recovery_expired);
2477
2478         if (!obd_recovery_abort(obd) && !obd->obd_recovery_expired) {
2479                 LASSERT(clnts <=
2480                         atomic_read(&obd->obd_max_recoverable_clients));
2481                 if (clnts + obd->obd_stale_clients <
2482                     atomic_read(&obd->obd_max_recoverable_clients))
2483                         return 0;
2484         }
2485
2486         if (!obd_mdt_recovery_abort(obd) && lut->lut_tdtd &&
2487             !lut->lut_tdtd->tdtd_replay_ready) {
2488                 /* Let's extend recovery timer, in case the recovery timer
2489                  * expired, and some clients got evicted
2490                  */
2491                 extend_recovery_timer(obd, obd->obd_recovery_timeout, true);
2492                 CDEBUG(D_HA,
2493                        "%s update recovery is not ready, extend recovery %d\n",
2494                        obd->obd_name, obd->obd_recovery_timeout);
2495                 return 0;
2496         }
2497
2498         return 1;
2499 }
2500
2501 enum {
2502         REQUEST_RECOVERY = 1,
2503         UPDATE_RECOVERY = 2,
2504 };
2505
2506 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2507 {
2508         __u64 transno = 0;
2509
2510         if (!list_empty(&obd->obd_req_replay_queue)) {
2511                 struct ptlrpc_request *req;
2512
2513                 req = list_first_entry(&obd->obd_req_replay_queue,
2514                                        struct ptlrpc_request, rq_list);
2515                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2516         }
2517
2518         return transno;
2519 }
2520
2521 static __u64 get_next_transno(struct lu_target *lut, int *type)
2522 {
2523         struct obd_device *obd = lut->lut_obd;
2524         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2525         __u64 transno = 0;
2526         __u64 update_transno;
2527
2528         ENTRY;
2529
2530         transno = get_next_replay_req_transno(obd);
2531         if (type != NULL)
2532                 *type = REQUEST_RECOVERY;
2533
2534         if (!tdtd || obd_mdt_recovery_abort(obd))
2535                 RETURN(transno);
2536
2537         update_transno = distribute_txn_get_next_transno(tdtd);
2538         if (transno == 0 || (transno >= update_transno &&
2539                              update_transno != 0)) {
2540                 transno = update_transno;
2541                 if (type != NULL)
2542                         *type = UPDATE_RECOVERY;
2543         }
2544
2545         RETURN(transno);
2546 }
2547
2548 /**
2549  * drop duplicate replay request
2550  *
2551  * Because the operation has been replayed by update recovery, the request
2552  * with the same transno will be dropped and also notify the client to send
2553  * next replay request.
2554  *
2555  * \param[in] env       execution environment
2556  * \param[in] obd       failover obd device
2557  * \param[in] req       request to be dropped
2558  *
2559  * \retval true         duplicate replay update is dropped
2560  * \retval false        duplicate replay update is not dropped
2561  */
2562 static bool drop_duplicate_replay_req(struct lu_env *env,
2563                                       struct obd_device *obd,
2564                                       struct ptlrpc_request *req)
2565 {
2566         __u32 opc = lustre_msg_get_opc(req->rq_reqmsg);
2567
2568         DEBUG_REQ(D_HA, req,
2569                   "remove t%lld from %s because duplicate update records found",
2570                   lustre_msg_get_transno(req->rq_reqmsg),
2571                   libcfs_nidstr(&req->rq_peer.nid));
2572
2573         /*
2574          * Right now, only for MDS reint operation update replay and
2575          * normal request replay can have the same transno
2576          */
2577         if (opc == MDS_REINT) {
2578                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2579                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2580                 if (likely(req->rq_export))
2581                         target_committed_to_req(req);
2582                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2583                 target_send_reply(req, req->rq_status, 0);
2584         } else if (opc == MDS_CLOSE) {
2585                 DEBUG_REQ(D_HA, req, "duplicate close replay from %s\n",
2586                                 libcfs_nidstr(&req->rq_peer.nid));
2587                 return false;
2588         } else {
2589                 DEBUG_REQ(D_ERROR, req, "wrong opc %d from %s\n", opc,
2590                           libcfs_nidstr(&req->rq_peer.nid));
2591         }
2592         target_exp_dequeue_req_replay(req);
2593         target_request_copy_put(req);
2594         obd->obd_replayed_requests++;
2595
2596         return true;
2597 }
2598
2599 #define WATCHDOG_TIMEOUT (obd_timeout * 10)
2600
2601 static void replay_request_or_update(struct lu_env *env,
2602                                      struct lu_target *lut,
2603                                      struct target_recovery_data *trd,
2604                                      struct ptlrpc_thread *thread)
2605 {
2606         struct obd_device *obd = lut->lut_obd;
2607         struct ptlrpc_request *req = NULL;
2608         int type;
2609         __u64 transno;
2610
2611         ENTRY;
2612
2613         CDEBUG(D_HA, "Waiting for transno %lld\n",
2614                obd->obd_next_recovery_transno);
2615
2616         /* Replay all of request and update by transno */
2617         do {
2618                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2619
2620                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2621
2622                 /**
2623                  * It is needed to extend recovery window above
2624                  *  recovery_time_soft. Extending is possible only in the
2625                  *  end of recovery window (see more details in
2626                  *  handle_recovery_req()).
2627                  */
2628                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2629
2630                 if (target_recovery_overseer(lut, check_for_next_transno,
2631                                         exp_req_replay_healthy_or_from_mdt)) {
2632                         abort_req_replay_queue(obd);
2633                         abort_lock_replay_queue(obd);
2634                         goto abort;
2635                 }
2636
2637                 spin_lock(&obd->obd_recovery_task_lock);
2638                 transno = get_next_transno(lut, &type);
2639                 if (type == REQUEST_RECOVERY && transno != 0) {
2640                         bool update = false;
2641                         /*
2642                          * Drop replay request from client side, if the
2643                          * replay has been executed by update with the
2644                          * same transno
2645                          */
2646                         req = list_first_entry(&obd->obd_req_replay_queue,
2647                                                struct ptlrpc_request, rq_list);
2648
2649                         list_del_init(&req->rq_list);
2650                         obd->obd_requests_queued_for_recovery--;
2651                         spin_unlock(&obd->obd_recovery_task_lock);
2652
2653                         /*
2654                          * Let's check if the request has been redone by
2655                          * update replay
2656                          */
2657                         if (is_req_replayed_by_update(req)) {
2658                                 struct distribute_txn_replay_req *dtrq;
2659
2660                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2661                                                                       transno);
2662                                 LASSERT(dtrq != NULL);
2663                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2664                                 list_del_init(&dtrq->dtrq_list);
2665                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2666                                 dtrq_destroy(dtrq);
2667
2668                                 if (drop_duplicate_replay_req(env, obd, req))
2669                                         continue;
2670                                 /* not dropped yet */
2671                                 update = true;
2672                         }
2673
2674                         LASSERT(trd->trd_processing_task == current->pid);
2675                         DEBUG_REQ(D_HA, req, "processing x%llu t%lld from %s",
2676                                   req->rq_xid,
2677                                   lustre_msg_get_transno(req->rq_reqmsg),
2678                                   libcfs_nidstr(&req->rq_peer.nid));
2679
2680                         ptlrpc_watchdog_init(&thread->t_watchdog,
2681                                              WATCHDOG_TIMEOUT);
2682                         handle_recovery_req(thread, req,
2683                                             trd->trd_recovery_handler);
2684                         ptlrpc_watchdog_disable(&thread->t_watchdog);
2685
2686                         /**
2687                          * bz18031: increase next_recovery_transno before
2688                          * target_request_copy_put() will drop exp_rpc reference
2689                          */
2690                         if (!update) {
2691                                 spin_lock(&obd->obd_recovery_task_lock);
2692                                 obd->obd_next_recovery_transno++;
2693                                 spin_unlock(&obd->obd_recovery_task_lock);
2694                         }
2695                         target_exp_dequeue_req_replay(req);
2696                         target_request_copy_put(req);
2697                         obd->obd_replayed_requests++;
2698                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2699                         struct distribute_txn_replay_req *dtrq;
2700                         int rc;
2701
2702                         spin_unlock(&obd->obd_recovery_task_lock);
2703
2704                         LASSERT(tdtd != NULL);
2705                         dtrq = distribute_txn_get_next_req(tdtd);
2706                         lu_context_enter(&thread->t_env->le_ctx);
2707                         ptlrpc_watchdog_init(&thread->t_watchdog,
2708                                              WATCHDOG_TIMEOUT);
2709                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2710                         ptlrpc_watchdog_disable(&thread->t_watchdog);
2711                         lu_context_exit(&thread->t_env->le_ctx);
2712                         extend_recovery_timer(obd, obd_timeout, true);
2713
2714                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2715                                 CDEBUG(D_HA,
2716                                        "Move x%llu t%llu to finish list\n",
2717                                        dtrq->dtrq_xid,
2718                                        dtrq->dtrq_master_transno);
2719
2720                                 /* Add it to the replay finish list */
2721                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2722                                 list_add(&dtrq->dtrq_list,
2723                                          &tdtd->tdtd_replay_finish_list);
2724                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2725
2726                                 spin_lock(&obd->obd_recovery_task_lock);
2727                                 if (transno == obd->obd_next_recovery_transno)
2728                                         obd->obd_next_recovery_transno++;
2729                                 else if (transno >
2730                                          obd->obd_next_recovery_transno)
2731                                         obd->obd_next_recovery_transno =
2732                                                                 transno + 1;
2733                                 spin_unlock(&obd->obd_recovery_task_lock);
2734                         } else {
2735                                 dtrq_destroy(dtrq);
2736                         }
2737                 } else {
2738                         spin_unlock(&obd->obd_recovery_task_lock);
2739 abort:
2740                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2741                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2742                         /** evict exports failed VBR */
2743                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2744                         break;
2745                 }
2746         } while (1);
2747 }
2748
2749 static int target_recovery_thread(void *arg)
2750 {
2751         struct lu_target *lut = arg;
2752         struct obd_device *obd = lut->lut_obd;
2753         struct ptlrpc_request *req;
2754         struct target_recovery_data *trd = &obd->obd_recovery_data;
2755         unsigned long delta;
2756         struct lu_env *env;
2757         struct ptlrpc_thread *thread = NULL;
2758         int rc = 0;
2759
2760         ENTRY;
2761         unshare_fs_struct();
2762         OBD_ALLOC_PTR(thread);
2763         if (thread == NULL)
2764                 RETURN(-ENOMEM);
2765
2766         OBD_ALLOC_PTR(env);
2767         if (env == NULL)
2768                 GOTO(out_thread, rc = -ENOMEM);
2769         rc = lu_env_add(env);
2770         if (rc)
2771                 GOTO(out_env, rc);
2772
2773         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2774         if (rc)
2775                 GOTO(out_env_remove, rc);
2776
2777         thread->t_env = env;
2778         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2779         thread->t_task = current;
2780         env->le_ctx.lc_thread = thread;
2781         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2782
2783         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2784                current->pid);
2785         trd->trd_processing_task = current->pid;
2786
2787         spin_lock(&obd->obd_dev_lock);
2788         obd->obd_recovering = 1;
2789         spin_unlock(&obd->obd_dev_lock);
2790         complete(&trd->trd_starting);
2791
2792         /* first of all, we have to know the first transno to replay */
2793         if (target_recovery_overseer(lut, check_for_recovery_ready,
2794                                      exp_connect_healthy)) {
2795                 abort_req_replay_queue(obd);
2796                 abort_lock_replay_queue(obd);
2797                 if (lut->lut_tdtd != NULL)
2798                         dtrq_list_destroy(lut->lut_tdtd);
2799         }
2800
2801         /* next stage: replay requests or update */
2802         delta = jiffies;
2803         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2804                atomic_read(&obd->obd_req_replay_clients),
2805                obd->obd_next_recovery_transno);
2806         replay_request_or_update(env, lut, trd, thread);
2807
2808         /**
2809          * The second stage: replay locks
2810          */
2811         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2812                atomic_read(&obd->obd_lock_replay_clients));
2813         while ((req = target_next_replay_lock(lut))) {
2814                 LASSERT(trd->trd_processing_task == current->pid);
2815                 DEBUG_REQ(D_HA, req, "processing lock from %s:",
2816                           libcfs_nidstr(&req->rq_peer.nid));
2817                 if (CFS_FAIL_CHECK(OBD_FAIL_LDLM_LOCK_REPLAY)) {
2818                         req->rq_status = -ENODEV;
2819                         target_request_copy_put(req);
2820                         continue;
2821                 }
2822                 handle_recovery_req(thread, req,
2823                                     trd->trd_recovery_handler);
2824                 target_request_copy_put(req);
2825                 obd->obd_replayed_locks++;
2826         }
2827
2828         /**
2829          * The third stage: reply on final pings, at this moment all clients
2830          * must have request in final queue
2831          */
2832         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2833         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2834         /** Update server last boot epoch */
2835         tgt_boot_epoch_update(lut);
2836
2837         /* cancel update llogs upon recovery abort */
2838         if (obd->obd_abort_recovery || obd->obd_abort_mdt_recovery)
2839                 OBP(obd, iocontrol)(OBD_IOC_LLOG_CANCEL, obd->obd_self_export,
2840                                     0, trd, NULL);
2841
2842         list_for_each_entry(req, &obd->obd_final_req_queue, rq_list) {
2843                 /*
2844                  * Because the waiting client can not send ping to server,
2845                  * so we need refresh the last_request_time, to avoid the
2846                  * export is being evicted
2847                  */
2848                 ptlrpc_update_export_timer(req->rq_export, 0);
2849         }
2850
2851         /*
2852          * We drop recoverying flag to forward all new requests
2853          * to regular mds_handle() since now
2854          */
2855         spin_lock(&obd->obd_dev_lock);
2856         obd->obd_recovering = 0;
2857         obd->obd_abort_recovery = 0;
2858         obd->obd_abort_mdt_recovery = 0;
2859         spin_unlock(&obd->obd_dev_lock);
2860         spin_lock(&obd->obd_recovery_task_lock);
2861         target_cancel_recovery_timer(obd);
2862         spin_unlock(&obd->obd_recovery_task_lock);
2863         while ((req = target_next_final_ping(obd))) {
2864                 LASSERT(trd->trd_processing_task == current->pid);
2865                 DEBUG_REQ(D_HA, req, "processing final ping from %s:",
2866                           libcfs_nidstr(&req->rq_peer.nid));
2867                 handle_recovery_req(thread, req,
2868                                     trd->trd_recovery_handler);
2869                 target_request_copy_put(req);
2870         }
2871
2872         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2873         CDEBUG(D_INFO, "4: recovery completed in %lus - %d/%d reqs/locks\n",
2874                delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2875         if (delta > OBD_RECOVERY_TIME_SOFT) {
2876                 CWARN("too long recovery - read logs\n");
2877                 libcfs_debug_dumplog();
2878         }
2879
2880         target_finish_recovery(lut);
2881         lu_context_fini(&env->le_ctx);
2882         trd->trd_processing_task = 0;
2883         complete_all(&trd->trd_finishing);
2884         tgt_io_thread_done(thread);
2885 out_env_remove:
2886         lu_env_remove(env);
2887 out_env:
2888         OBD_FREE_PTR(env);
2889 out_thread:
2890         OBD_FREE_PTR(thread);
2891         RETURN(rc);
2892 }
2893
2894 static int target_start_recovery_thread(struct lu_target *lut,
2895                                         svc_handler_t handler)
2896 {
2897         struct obd_device *obd = lut->lut_obd;
2898         int rc = 0;
2899         struct target_recovery_data *trd = &obd->obd_recovery_data;
2900         int index;
2901
2902         memset(trd, 0, sizeof(*trd));
2903         init_completion(&trd->trd_starting);
2904         init_completion(&trd->trd_finishing);
2905         trd->trd_recovery_handler = handler;
2906
2907         rc = server_name2index(obd->obd_name, &index, NULL);
2908         if (rc < 0)
2909                 return rc;
2910
2911         if (!IS_ERR(kthread_run(target_recovery_thread,
2912                                 lut, "tgt_recover_%d", index))) {
2913                 wait_for_completion(&trd->trd_starting);
2914                 LASSERT(obd->obd_recovering != 0);
2915         } else {
2916                 rc = -ECHILD;
2917         }
2918
2919         return rc;
2920 }
2921
2922 void target_stop_recovery_thread(struct obd_device *obd)
2923 {
2924         if (obd->obd_recovery_data.trd_processing_task > 0) {
2925                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2926                 /** recovery can be done but postrecovery is not yet */
2927                 spin_lock(&obd->obd_dev_lock);
2928                 if (obd->obd_recovering) {
2929                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2930                         obd->obd_abort_recovery = 1;
2931                         wake_up(&obd->obd_next_transno_waitq);
2932                 }
2933                 spin_unlock(&obd->obd_dev_lock);
2934                 wait_for_completion(&trd->trd_finishing);
2935         }
2936 }
2937 EXPORT_SYMBOL(target_stop_recovery_thread);
2938
2939 void target_recovery_fini(struct obd_device *obd)
2940 {
2941         class_disconnect_exports(obd);
2942         target_stop_recovery_thread(obd);
2943         target_cleanup_recovery(obd);
2944 }
2945 EXPORT_SYMBOL(target_recovery_fini);
2946
2947 static enum hrtimer_restart target_recovery_expired(struct hrtimer *timer)
2948 {
2949         struct obd_device *obd = container_of(timer, struct obd_device,
2950                                               obd_recovery_timer);
2951
2952         CDEBUG(D_HA,
2953                "%s: recovery timed out; %d clients are still in recovery after %llu seconds (%d clients connected)\n",
2954                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2955                ktime_get_seconds() - obd->obd_recovery_start,
2956                atomic_read(&obd->obd_connected_clients));
2957
2958         obd->obd_recovery_expired = 1;
2959         wake_up(&obd->obd_next_transno_waitq);
2960         return HRTIMER_NORESTART;
2961 }
2962
2963 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2964 {
2965         struct obd_device *obd = lut->lut_obd;
2966
2967         if (lut->lut_bottom->dd_rdonly)
2968                 return;
2969
2970         if (atomic_read(&obd->obd_max_recoverable_clients) == 0) {
2971                 /** Update server last boot epoch */
2972                 tgt_boot_epoch_update(lut);
2973                 return;
2974         }
2975
2976         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2977                "last_transno %llu\n", obd->obd_name,
2978                atomic_read(&obd->obd_max_recoverable_clients),
2979                obd->obd_last_committed);
2980         LASSERT(obd->obd_stopping == 0);
2981         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2982         obd->obd_recovery_start = 0;
2983         obd->obd_recovery_end = 0;
2984
2985         hrtimer_init(&obd->obd_recovery_timer, CLOCK_MONOTONIC,
2986                      HRTIMER_MODE_ABS);
2987         obd->obd_recovery_timer.function = &target_recovery_expired;
2988         target_start_recovery_thread(lut, handler);
2989 }
2990 EXPORT_SYMBOL(target_recovery_init);
2991
2992 static int target_process_req_flags(struct obd_device *obd,
2993                                     struct ptlrpc_request *req)
2994 {
2995         struct obd_export *exp = req->rq_export;
2996
2997         LASSERT(exp != NULL);
2998         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2999                 /* client declares he's ready to replay locks */
3000                 spin_lock(&exp->exp_lock);
3001                 if (exp->exp_req_replay_needed) {
3002                         exp->exp_req_replay_needed = 0;
3003                         spin_unlock(&exp->exp_lock);
3004
3005                         LASSERT(atomic_read(&(obd)->obd_req_replay_clients) >
3006                                 0);
3007                         atomic_dec(&obd->obd_req_replay_clients);
3008                 } else {
3009                         spin_unlock(&exp->exp_lock);
3010                 }
3011         }
3012         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
3013                 /*
3014                  * client declares he's ready to complete recovery
3015                  * so, we put the request on th final queue
3016                  */
3017                 spin_lock(&exp->exp_lock);
3018                 if (exp->exp_lock_replay_needed) {
3019                         exp->exp_lock_replay_needed = 0;
3020                         spin_unlock(&exp->exp_lock);
3021
3022                         LASSERT(atomic_read(&(obd)->obd_lock_replay_clients) >
3023                                 0);
3024                         atomic_dec(&obd->obd_lock_replay_clients);
3025                 } else {
3026                         spin_unlock(&exp->exp_lock);
3027                 }
3028         }
3029         return 0;
3030 }
3031
3032 int target_queue_recovery_request(struct ptlrpc_request *req,
3033                                   struct obd_device *obd)
3034 {
3035         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
3036         struct ptlrpc_request *reqiter;
3037         int inserted = 0;
3038
3039         ENTRY;
3040
3041         if (obd->obd_recovery_data.trd_processing_task == current->pid) {
3042                 /* Processing the queue right now, don't re-add. */
3043                 RETURN(1);
3044         }
3045
3046         target_process_req_flags(obd, req);
3047
3048         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
3049                 if (unlikely(CFS_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
3050                         if (cfs_fail_val == 1) {
3051                                 cfs_race_state = 1;
3052                                 cfs_fail_val = 0;
3053                                 wake_up(&cfs_race_waitq);
3054
3055                                 schedule_timeout_interruptible(
3056                                         cfs_time_seconds(1));
3057                         }
3058                 }
3059
3060                 /*
3061                  * client declares he's ready to complete recovery
3062                  * so, we put the request on th final queue
3063                  */
3064                 target_request_copy_get(req);
3065                 DEBUG_REQ(D_HA, req, "queue final req");
3066                 wake_up(&obd->obd_next_transno_waitq);
3067                 spin_lock(&obd->obd_recovery_task_lock);
3068                 if (obd->obd_recovering) {
3069                         struct ptlrpc_request *tmp;
3070                         struct ptlrpc_request *duplicate = NULL;
3071
3072                         if (likely(!req->rq_export->exp_replay_done)) {
3073                                 req->rq_export->exp_replay_done = 1;
3074                                 list_add_tail(&req->rq_list,
3075                                               &obd->obd_final_req_queue);
3076                                 spin_unlock(&obd->obd_recovery_task_lock);
3077                                 RETURN(0);
3078                         }
3079
3080                         /*
3081                          * XXX O(n), but only happens if final ping is
3082                          * timed out, probably reorganize the list as
3083                          * a hash list later
3084                          */
3085                         list_for_each_entry_safe(reqiter, tmp,
3086                                                  &obd->obd_final_req_queue,
3087                                                  rq_list) {
3088                                 if (reqiter->rq_export == req->rq_export) {
3089                                         list_del_init(&reqiter->rq_list);
3090                                         duplicate = reqiter;
3091                                         break;
3092                                 }
3093                         }
3094
3095                         list_add_tail(&req->rq_list,
3096                                       &obd->obd_final_req_queue);
3097                         req->rq_export->exp_replay_done = 1;
3098                         spin_unlock(&obd->obd_recovery_task_lock);
3099
3100                         if (duplicate != NULL) {
3101                                 DEBUG_REQ(D_HA, duplicate,
3102                                           "put prev final req");
3103                                 target_request_copy_put(duplicate);
3104                         }
3105                         RETURN(0);
3106                 } else {
3107                         spin_unlock(&obd->obd_recovery_task_lock);
3108                         target_request_copy_put(req);
3109                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
3110                 }
3111         }
3112         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
3113                 /* client declares he's ready to replay locks */
3114                 target_request_copy_get(req);
3115                 DEBUG_REQ(D_HA, req, "queue lock replay req");
3116                 wake_up(&obd->obd_next_transno_waitq);
3117                 spin_lock(&obd->obd_recovery_task_lock);
3118                 LASSERT(obd->obd_recovering);
3119                 /* usually due to recovery abort */
3120                 if (!req->rq_export->exp_in_recovery) {
3121                         spin_unlock(&obd->obd_recovery_task_lock);
3122                         target_request_copy_put(req);
3123                         RETURN(-ENOTCONN);
3124                 }
3125                 LASSERT(req->rq_export->exp_lock_replay_needed);
3126                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
3127                 spin_unlock(&obd->obd_recovery_task_lock);
3128                 RETURN(0);
3129         }
3130
3131         /*
3132          * CAVEAT EMPTOR: The incoming request message has been swabbed
3133          * (i.e. buflens etc are in my own byte order), but type-dependent
3134          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed.
3135          */
3136
3137         if (!transno) {
3138                 INIT_LIST_HEAD(&req->rq_list);
3139                 DEBUG_REQ(D_HA, req, "not queueing");
3140                 RETURN(1);
3141         }
3142
3143         /*
3144          * If we're processing the queue, we want don't want to queue this
3145          * message.
3146          *
3147          * Also, if this request has a transno less than the one we're waiting
3148          * for, we should process it now.  It could (and currently always will)
3149          * be an open request for a descriptor that was opened some time ago.
3150          *
3151          * Also, a resent, replayed request that has already been
3152          * handled will pass through here and be processed immediately.
3153          */
3154         CDEBUG(D_HA,
3155                "Next recovery transno: %llu, current: %llu, replaying\n",
3156                obd->obd_next_recovery_transno, transno);
3157
3158         /*
3159          * If the request has been replayed by update replay, then sends this
3160          * request to the recovery thread (replay_request_or_update()), where
3161          * it will be handled
3162          */
3163         spin_lock(&obd->obd_recovery_task_lock);
3164         if (transno < obd->obd_next_recovery_transno &&
3165             !is_req_replayed_by_update(req)) {
3166                 /* Processing the queue right now, don't re-add. */
3167                 LASSERT(list_empty(&req->rq_list));
3168                 spin_unlock(&obd->obd_recovery_task_lock);
3169                 RETURN(1);
3170         }
3171         spin_unlock(&obd->obd_recovery_task_lock);
3172
3173         if (CFS_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
3174                 RETURN(0);
3175
3176         target_request_copy_get(req);
3177         if (!req->rq_export->exp_in_recovery) {
3178                 target_request_copy_put(req);
3179                 RETURN(-ENOTCONN);
3180         }
3181         LASSERT(req->rq_export->exp_req_replay_needed);
3182
3183         if (target_exp_enqueue_req_replay(req)) {
3184                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
3185                 target_request_copy_put(req);
3186                 RETURN(0);
3187         }
3188
3189         /* XXX O(n^2) */
3190         spin_lock(&obd->obd_recovery_task_lock);
3191         LASSERT(obd->obd_recovering);
3192         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
3193                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
3194                         list_add_tail(&req->rq_list, &reqiter->rq_list);
3195                         inserted = 1;
3196                         goto added;
3197                 }
3198
3199                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
3200                              transno)) {
3201                         DEBUG_REQ(D_ERROR, req,
3202                                   "dropping replay: transno has been claimed by another client");
3203                         spin_unlock(&obd->obd_recovery_task_lock);
3204                         target_exp_dequeue_req_replay(req);
3205                         target_request_copy_put(req);
3206                         RETURN(0);
3207                 }
3208         }
3209 added:
3210         if (!inserted)
3211                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
3212
3213         obd->obd_requests_queued_for_recovery++;
3214         spin_unlock(&obd->obd_recovery_task_lock);
3215         wake_up(&obd->obd_next_transno_waitq);
3216         RETURN(0);
3217 }
3218
3219 void target_committed_to_req(struct ptlrpc_request *req)
3220 {
3221         struct obd_export *exp = req->rq_export;
3222
3223         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
3224                 lustre_msg_set_last_committed(req->rq_repmsg,
3225                                               exp->exp_last_committed);
3226         else
3227                 DEBUG_REQ(D_IOCTL, req,
3228                           "not sending last_committed update (%d/%d)",
3229                           exp->exp_obd->obd_no_transno,
3230                           req->rq_repmsg == NULL);
3231
3232         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
3233                exp->exp_last_committed, req->rq_transno, req->rq_xid);
3234 }
3235
3236 #endif /* HAVE_SERVER_SUPPORT */
3237
3238 /**
3239  * Packs current SLV and Limit into \a req.
3240  */
3241 int target_pack_pool_reply(struct ptlrpc_request *req)
3242 {
3243         struct obd_device *obd;
3244
3245         ENTRY;
3246
3247         /*
3248          * Check that we still have all structures alive as this may
3249          * be some late RPC at shutdown time.
3250          */
3251         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
3252                      !exp_connect_lru_resize(req->rq_export))) {
3253                 lustre_msg_set_slv(req->rq_repmsg, 0);
3254                 lustre_msg_set_limit(req->rq_repmsg, 0);
3255                 RETURN(0);
3256         }
3257
3258         /* OBD is alive here as export is alive, which we checked above. */
3259         obd = req->rq_export->exp_obd;
3260
3261         read_lock(&obd->obd_pool_lock);
3262         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
3263         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
3264         read_unlock(&obd->obd_pool_lock);
3265
3266         RETURN(0);
3267 }
3268
3269 static int target_send_reply_msg(struct ptlrpc_request *req,
3270                                  int rc, int fail_id)
3271 {
3272         if (CFS_FAIL_CHECK_ORSET(fail_id & ~CFS_FAIL_ONCE, CFS_FAIL_ONCE)) {
3273                 DEBUG_REQ(D_ERROR, req, "dropping reply");
3274                 return -ECOMM;
3275         }
3276         /*
3277          * We can have a null rq_reqmsg in the event of bad signature or
3278          * no context when unwrapping
3279          */
3280         if (req->rq_reqmsg &&
3281             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
3282             CFS_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
3283                 return -ECOMM;
3284
3285         if (unlikely(rc)) {
3286                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
3287                 req->rq_status = rc;
3288                 return ptlrpc_send_error(req, 1);
3289         }
3290         DEBUG_REQ(D_NET, req, "sending reply");
3291
3292         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
3293 }
3294
3295 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
3296 {
3297         struct ptlrpc_service_part *svcpt;
3298         int netrc;
3299         struct ptlrpc_reply_state *rs;
3300         struct obd_export *exp;
3301
3302         ENTRY;
3303
3304         if (req->rq_no_reply) {
3305                 EXIT;
3306                 return;
3307         }
3308
3309         svcpt = req->rq_rqbd->rqbd_svcpt;
3310         rs = req->rq_reply_state;
3311         if (rs == NULL || !rs->rs_difficult) {
3312                 /* no notifiers */
3313                 target_send_reply_msg(req, rc, fail_id);
3314                 EXIT;
3315                 return;
3316         }
3317
3318         /* must be an export if locks saved */
3319         LASSERT(req->rq_export != NULL);
3320         /* req/reply consistent */
3321         LASSERT(rs->rs_svcpt == svcpt);
3322
3323         /* "fresh" reply */
3324         LASSERT(!rs->rs_scheduled);
3325         LASSERT(!rs->rs_scheduled_ever);
3326         LASSERT(!rs->rs_handled);
3327         LASSERT(!rs->rs_sent);
3328         LASSERT(!rs->rs_unlinked);
3329         LASSERT(rs->rs_export == NULL);
3330         LASSERT(list_empty(&rs->rs_obd_list));
3331         LASSERT(list_empty(&rs->rs_exp_list));
3332
3333         exp = class_export_get(req->rq_export);
3334
3335         /* disable reply scheduling while I'm setting up */
3336         rs->rs_scheduled = 1;
3337         rs->rs_sent      = 0;
3338         rs->rs_unlinked  = 0;
3339         rs->rs_xid       = req->rq_xid;
3340         rs->rs_transno   = req->rq_transno;
3341         rs->rs_export    = exp;
3342         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
3343
3344         spin_lock(&exp->exp_uncommitted_replies_lock);
3345         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
3346                rs->rs_transno, exp->exp_last_committed);
3347         if (rs->rs_transno > exp->exp_last_committed) {
3348                 /* not committed already */
3349                 list_add_tail(&rs->rs_obd_list,
3350                                   &exp->exp_uncommitted_replies);
3351         }
3352         spin_unlock(&exp->exp_uncommitted_replies_lock);
3353
3354         spin_lock(&exp->exp_lock);
3355         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
3356         spin_unlock(&exp->exp_lock);
3357
3358         netrc = target_send_reply_msg(req, rc, fail_id);
3359
3360         spin_lock(&svcpt->scp_rep_lock);
3361
3362         atomic_inc(&svcpt->scp_nreps_difficult);
3363
3364         if (netrc != 0) {
3365                 /*
3366                  * error sending: reply is off the net.  Also we need +1
3367                  * reply ref until ptlrpc_handle_rs() is done
3368                  * with the reply state (if the send was successful, there
3369                  * would have been +1 ref for the net, which
3370                  * reply_out_callback leaves alone)
3371                  */
3372                 rs->rs_sent = 1;
3373                 rs->rs_unlinked = 1;
3374                 ptlrpc_rs_addref(rs);
3375         }
3376
3377         spin_lock(&rs->rs_lock);
3378         if (rs->rs_transno <= exp->exp_last_committed ||
3379             (rs->rs_unlinked && !rs->rs_no_ack) ||
3380             list_empty(&rs->rs_exp_list) ||     /* completed already */
3381             list_empty(&rs->rs_obd_list)) {
3382                 CDEBUG(D_HA, "Schedule reply immediately\n");
3383                 ptlrpc_dispatch_difficult_reply(rs);
3384         } else {
3385                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
3386                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
3387         }
3388         spin_unlock(&rs->rs_lock);
3389         spin_unlock(&svcpt->scp_rep_lock);
3390         EXIT;
3391 }
3392
3393 enum ldlm_mode lck_compat_array[] = {
3394         [LCK_EX]    = LCK_COMPAT_EX,
3395         [LCK_PW]    = LCK_COMPAT_PW,
3396         [LCK_PR]    = LCK_COMPAT_PR,
3397         [LCK_CW]    = LCK_COMPAT_CW,
3398         [LCK_CR]    = LCK_COMPAT_CR,
3399         [LCK_NL]    = LCK_COMPAT_NL,
3400         [LCK_GROUP] = LCK_COMPAT_GROUP,
3401         [LCK_COS]   = LCK_COMPAT_COS,
3402 };
3403
3404 /**
3405  * Rather arbitrary mapping from LDLM error codes to errno values. This should
3406  * not escape to the user level.
3407  */
3408 int ldlm_error2errno(enum ldlm_error error)
3409 {
3410         int result;
3411
3412         switch (error) {
3413         case ELDLM_OK:
3414         case ELDLM_LOCK_MATCHED:
3415                 result = 0;
3416                 break;
3417         case ELDLM_LOCK_CHANGED:
3418                 result = -ESTALE;
3419                 break;
3420         case ELDLM_LOCK_ABORTED:
3421                 result = -ENAVAIL;
3422                 break;
3423         case ELDLM_LOCK_REPLACED:
3424                 result = -ESRCH;
3425                 break;
3426         case ELDLM_NO_LOCK_DATA:
3427                 result = -ENOENT;
3428                 break;
3429         case ELDLM_NAMESPACE_EXISTS:
3430                 result = -EEXIST;
3431                 break;
3432         case ELDLM_BAD_NAMESPACE:
3433                 result = -EBADF;
3434                 break;
3435         default:
3436                 if (((int)error) < 0) { /* cast to signed type */
3437                         result = error; /* as ldlm_error can be unsigned */
3438                 } else {
3439                         CERROR("Invalid DLM result code: %d\n", error);
3440                         result = -EPROTO;
3441                 }
3442         }
3443         return result;
3444 }
3445 EXPORT_SYMBOL(ldlm_error2errno);
3446
3447 /**
3448  * Dual to ldlm_error2errno(): maps errno values back to enum ldlm_error.
3449  */
3450 enum ldlm_error ldlm_errno2error(int err_no)
3451 {
3452         int error;
3453
3454         switch (err_no) {
3455         case 0:
3456                 error = ELDLM_OK;
3457                 break;
3458         case -ESTALE:
3459                 error = ELDLM_LOCK_CHANGED;
3460                 break;
3461         case -ENAVAIL:
3462                 error = ELDLM_LOCK_ABORTED;
3463                 break;
3464         case -ESRCH:
3465                 error = ELDLM_LOCK_REPLACED;
3466                 break;
3467         case -ENOENT:
3468                 error = ELDLM_NO_LOCK_DATA;
3469                 break;
3470         case -EEXIST:
3471                 error = ELDLM_NAMESPACE_EXISTS;
3472                 break;
3473         case -EBADF:
3474                 error = ELDLM_BAD_NAMESPACE;
3475                 break;
3476         default:
3477                 error = err_no;
3478         }
3479         return error;
3480 }
3481
3482 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3483 void ldlm_dump_export_locks(struct obd_export *exp)
3484 {
3485         spin_lock(&exp->exp_locks_list_guard);
3486         if (!list_empty(&exp->exp_locks_list)) {
3487                 struct ldlm_lock *lock;
3488
3489                 CERROR("dumping locks for export %p, ignore if the unmount doesn't hang\n",
3490                        exp);
3491                 list_for_each_entry(lock, &exp->exp_locks_list,
3492                                         l_exp_refs_link)
3493                         LDLM_ERROR(lock, "lock:");
3494         }
3495         spin_unlock(&exp->exp_locks_list_guard);
3496 }
3497 #endif
3498
3499 #ifdef HAVE_SERVER_SUPPORT
3500 static inline const char *bulk2type(struct ptlrpc_request *req)
3501 {
3502         if (req->rq_bulk_read)
3503                 return "READ";
3504         if (req->rq_bulk_write)
3505                 return "WRITE";
3506         return "UNKNOWN";
3507 }
3508
3509 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc)
3510 {
3511         struct ptlrpc_request *req = desc->bd_req;
3512         time64_t start = ktime_get_seconds();
3513         time64_t deadline;
3514         int rc = 0;
3515
3516         ENTRY;
3517
3518         /* If there is eviction in progress, wait for it to finish. */
3519         wait_event_idle(
3520                 exp->exp_obd->obd_evict_inprogress_waitq,
3521                 !atomic_read(&exp->exp_obd->obd_evict_inprogress));
3522
3523         /* Check if client was evicted or reconnected already. */
3524         if (exp->exp_failed ||
3525             exp->exp_conn_cnt > lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3526                 rc = -ENOTCONN;
3527         } else {
3528                 if (req->rq_bulk_read)
3529                         rc = sptlrpc_svc_wrap_bulk(req, desc);
3530
3531                 if (OCD_HAS_FLAG(&exp->exp_connect_data, BULK_MBITS))
3532                         req->rq_mbits = lustre_msg_get_mbits(req->rq_reqmsg);
3533                 else /* old version, bulk matchbits is rq_xid */
3534                         req->rq_mbits = req->rq_xid;
3535
3536                 if (rc == 0)
3537                         rc = ptlrpc_start_bulk_transfer(desc);
3538         }
3539
3540         if (rc < 0) {
3541                 DEBUG_REQ(D_ERROR, req, "bulk %s failed: rc = %d",
3542                           bulk2type(req), rc);
3543                 RETURN(rc);
3544         }
3545
3546         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
3547                 ptlrpc_abort_bulk(desc);
3548                 RETURN(0);
3549         }
3550
3551         /* limit actual bulk transfer to bulk_timeout seconds */
3552         deadline = start + bulk_timeout;
3553         if (deadline > req->rq_deadline)
3554                 deadline = req->rq_deadline;
3555
3556         do {
3557                 time64_t timeoutl = deadline - ktime_get_seconds();
3558                 time64_t rq_deadline;
3559
3560                 while (timeoutl >= 0 &&
3561                        wait_event_idle_timeout(
3562                                desc->bd_waitq,
3563                                !ptlrpc_server_bulk_active(desc) ||
3564                                exp->exp_failed ||
3565                                exp->exp_conn_cnt >
3566                                lustre_msg_get_conn_cnt(req->rq_reqmsg),
3567                                timeoutl ? cfs_time_seconds(1) : 1) == 0)
3568                         timeoutl -= 1;
3569                 rc = timeoutl < 0 ? -ETIMEDOUT : 0;
3570
3571                 /* Wait again if we changed rq_deadline. */
3572                 rq_deadline = READ_ONCE(req->rq_deadline);
3573                 deadline = start + bulk_timeout;
3574                 if (deadline > rq_deadline)
3575                         deadline = rq_deadline;
3576         } while (rc == -ETIMEDOUT &&
3577                  deadline > ktime_get_seconds());
3578
3579         if (rc == -ETIMEDOUT) {
3580                 DEBUG_REQ(D_ERROR, req, "timeout on bulk %s after %lld%+llds",
3581                           bulk2type(req), deadline - start,
3582                           ktime_get_real_seconds() - deadline);
3583                 ptlrpc_abort_bulk(desc);
3584         } else if (exp->exp_failed) {
3585                 DEBUG_REQ(D_ERROR, req, "Eviction on bulk %s",
3586                           bulk2type(req));
3587                 rc = -ENOTCONN;
3588                 ptlrpc_abort_bulk(desc);
3589         } else if (exp->exp_conn_cnt >
3590                    lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3591                 DEBUG_REQ(D_ERROR, req, "Reconnect on bulk %s",
3592                           bulk2type(req));
3593                 /* We don't reply anyway. */
3594                 rc = -ETIMEDOUT;
3595                 ptlrpc_abort_bulk(desc);
3596         } else if (desc->bd_failure) {
3597                 DEBUG_REQ(D_ERROR, req, "network error on bulk %s",
3598                           bulk2type(req));
3599                 /* XXX should this be a different errno? */
3600                 rc = -ETIMEDOUT;
3601         } else {
3602                 if (req->rq_bulk_write)
3603                         rc = sptlrpc_svc_unwrap_bulk(req, desc);
3604                 if (rc == 0 && desc->bd_nob_transferred != desc->bd_nob) {
3605                         DEBUG_REQ(D_ERROR, req, "truncated bulk %s %d(%d)",
3606                                   bulk2type(req), desc->bd_nob_transferred,
3607                                   desc->bd_nob);
3608                         /* XXX should this be a different errno? */
3609                         rc = -ETIMEDOUT;
3610                 }
3611         }
3612
3613         RETURN(rc);
3614 }
3615 EXPORT_SYMBOL(target_bulk_io);
3616
3617 #endif /* HAVE_SERVER_SUPPORT */