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                                struct lnet_nid *prim_nid, int priority)
 149 {
 150         struct ptlrpc_connection *ptlrpc_conn;
 151         int rc;
 152
 153         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid, LNET_NID_NET(prim_nid));
 154         if (!ptlrpc_conn) {
 155                 const char *str_uuid = obd_uuid2str(uuid);
 156
 157                 rc = class_add_uuid(str_uuid, prim_nid);
 158                 if (rc) {
 159                         CERROR("%s: failed to add UUID '%s': rc = %d\n",
 160                                imp->imp_obd->obd_name, str_uuid, rc);
 161                         return rc;
 162                 }
 163         }
 164         return import_set_conn(imp, uuid, priority, 1);
 165 }
 166 EXPORT_SYMBOL(client_import_dyn_add_conn);
 167
 168 int client_import_add_nids_to_conn(struct obd_import *imp,
 169                                    struct lnet_nid *nidlist,
 170                                    int nid_count, int nid_size,
 171                                    struct obd_uuid *uuid)
 172 {
 173         struct obd_import_conn *conn;
 174         int rc = -ENOENT;
 175
 176         ENTRY;
 177         if (nid_count <= 0 || !nidlist)
 178                 return rc;
 179
 180         spin_lock(&imp->imp_lock);
 181         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 182                 if (class_check_uuid(&conn->oic_uuid, &nidlist[0])) {
 183                         *uuid = conn->oic_uuid;
 184                         spin_unlock(&imp->imp_lock);
 185                         rc = class_add_nids_to_uuid(&conn->oic_uuid, nidlist,
 186                                                     nid_count, nid_size);
 187                         RETURN(rc);
 188                 }
 189         }
 190         spin_unlock(&imp->imp_lock);
 191         RETURN(rc);
 192 }
 193 EXPORT_SYMBOL(client_import_add_nids_to_conn);
 194
 195 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 196 {
 197         struct obd_import_conn *imp_conn;
 198         struct obd_export *dlmexp;
 199         int rc = -ENOENT;
 200
 201         ENTRY;
 202
 203         spin_lock(&imp->imp_lock);
 204         if (list_empty(&imp->imp_conn_list)) {
 205                 LASSERT(!imp->imp_connection);
 206                 GOTO(out, rc);
 207         }
 208
 209         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 210                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 211                         continue;
 212                 LASSERT(imp_conn->oic_conn);
 213
 214                 if (imp_conn == imp->imp_conn_current) {
 215                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 216
 217                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 218                             imp->imp_state != LUSTRE_IMP_DISCON) {
 219                                 CERROR("can't remove current connection\n");
 220                                 GOTO(out, rc = -EBUSY);
 221                         }
 222
 223                         ptlrpc_connection_put(imp->imp_connection);
 224                         imp->imp_connection = NULL;
 225
 226                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 227                         if (dlmexp && dlmexp->exp_connection) {
 228                                 LASSERT(dlmexp->exp_connection ==
 229                                         imp_conn->oic_conn);
 230                                 ptlrpc_connection_put(dlmexp->exp_connection);
 231                                 dlmexp->exp_connection = NULL;
 232                         }
 233
 234                         if (dlmexp != NULL)
 235                                 class_export_put(dlmexp);
 236                 }
 237
 238                 list_del(&imp_conn->oic_item);
 239                 ptlrpc_connection_put(imp_conn->oic_conn);
 240                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 241                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 242                        imp, imp->imp_obd->obd_name, uuid->uuid);
 243                 rc = 0;
 244                 break;
 245         }
 246 out:
 247         spin_unlock(&imp->imp_lock);
 248         if (rc == -ENOENT)
 249                 CERROR("connection %s not found\n", uuid->uuid);
 250         RETURN(rc);
 251 }
 252 EXPORT_SYMBOL(client_import_del_conn);
 253
 254 void client_destroy_import(struct obd_import *imp)
 255 {
 256         /*
 257          * Drop security policy instance after all RPCs have finished/aborted
 258          * to let all busy contexts be released.
 259          */
 260         class_import_get(imp);
 261         class_destroy_import(imp);
 262         sptlrpc_import_sec_put(imp);
 263         class_import_put(imp);
 264 }
 265 EXPORT_SYMBOL(client_destroy_import);
 266
 267 /**
 268  * Check whether or not the OSC is on MDT.
 269  * In the config log,
 270  * osc on MDT
 271  *      setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
 272  * osc on client
 273  *      setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
 274  *
 275  **/
 276 static int osc_on_mdt(char *obdname)
 277 {
 278         char *ptr;
 279
 280         ptr = strrchr(obdname, '-');
 281         if (ptr == NULL)
 282                 return 0;
 283
 284         if (strncmp(ptr + 1, "MDT", 3) == 0)
 285                 return 1;
 286
 287         return 0;
 288 }
 289
 290 /*
 291  * Configure an RPC client OBD device.
 292  *
 293  * lcfg parameters:
 294  * 1 - client UUID
 295  * 2 - server UUID
 296  * 3 - inactive-on-startup
 297  * 4 - restrictive net
 298  */
 299 int client_obd_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 300 {
 301         struct client_obd *cli = &obd->u.cli;
 302         struct obd_import *imp;
 303         struct obd_uuid server_uuid;
 304         int rq_portal, rp_portal, connect_op;
 305         const char *name = obd->obd_type->typ_name;
 306         enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
 307         char *cli_name = lustre_cfg_buf(lcfg, 0);
 308         int rc;
 309
 310         ENTRY;
 311
 312         /*
 313          * In a more perfect world, we would hang a ptlrpc_client off of
 314          * obd_type and just use the values from there.
 315          */
 316         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 317                 rq_portal = OST_REQUEST_PORTAL;
 318                 rp_portal = OSC_REPLY_PORTAL;
 319                 connect_op = OST_CONNECT;
 320                 cli->cl_sp_me = LUSTRE_SP_CLI;
 321                 cli->cl_sp_to = LUSTRE_SP_OST;
 322                 ns_type = LDLM_NS_TYPE_OSC;
 323         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
 324                    !strcmp(name, LUSTRE_LWP_NAME)) {
 325                 rq_portal = MDS_REQUEST_PORTAL;
 326                 rp_portal = MDC_REPLY_PORTAL;
 327                 connect_op = MDS_CONNECT;
 328                 if (is_lwp_on_ost(cli_name))
 329                         cli->cl_sp_me = LUSTRE_SP_OST;
 330                 else if (is_lwp_on_mdt(cli_name))
 331                         cli->cl_sp_me = LUSTRE_SP_MDT;
 332                 else
 333                         cli->cl_sp_me = LUSTRE_SP_CLI;
 334                 cli->cl_sp_to = LUSTRE_SP_MDT;
 335                 ns_type = LDLM_NS_TYPE_MDC;
 336         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
 337                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
 338                         /* OSP_on_MDT for other MDTs */
 339                         connect_op = MDS_CONNECT;
 340                         cli->cl_sp_to = LUSTRE_SP_MDT;
 341                         ns_type = LDLM_NS_TYPE_MDC;
 342                         rq_portal = OUT_PORTAL;
 343                 } else {
 344                         /* OSP on MDT for OST */
 345                         connect_op = OST_CONNECT;
 346                         cli->cl_sp_to = LUSTRE_SP_OST;
 347                         ns_type = LDLM_NS_TYPE_OSC;
 348                         rq_portal = OST_REQUEST_PORTAL;
 349                 }
 350                 rp_portal = OSC_REPLY_PORTAL;
 351                 cli->cl_sp_me = LUSTRE_SP_MDT;
 352         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 353                 rq_portal = MGS_REQUEST_PORTAL;
 354                 rp_portal = MGC_REPLY_PORTAL;
 355                 connect_op = MGS_CONNECT;
 356                 cli->cl_sp_me = LUSTRE_SP_MGC;
 357                 cli->cl_sp_to = LUSTRE_SP_MGS;
 358                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 359                 ns_type = LDLM_NS_TYPE_MGC;
 360         } else {
 361                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 362                        name);
 363                 RETURN(-EINVAL);
 364         }
 365
 366         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 367                 CERROR("requires a TARGET UUID\n");
 368                 RETURN(-EINVAL);
 369         }
 370
 371         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 372                 CERROR("client UUID must be less than 38 characters\n");
 373                 RETURN(-EINVAL);
 374         }
 375
 376         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 377                 CERROR("setup requires a SERVER UUID\n");
 378                 RETURN(-EINVAL);
 379         }
 380
 381         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 382                 CERROR("target UUID must be less than 38 characters\n");
 383                 RETURN(-EINVAL);
 384         }
 385
 386         init_rwsem(&cli->cl_sem);
 387         mutex_init(&cli->cl_mgc_mutex);
 388         cli->cl_seq = NULL;
 389         init_rwsem(&cli->cl_seq_rwsem);
 390         cli->cl_conn_count = 0;
 391         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 392                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 393                      sizeof(server_uuid)));
 394
 395         cli->cl_dirty_pages = 0;
 396         cli->cl_dirty_max_pages = 0;
 397         cli->cl_avail_grant = 0;
 398         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
 399         /*
 400          * cl_dirty_max_pages may be changed at connect time in
 401          * ptlrpc_connect_interpret().
 402          */
 403         client_adjust_max_dirty(cli);
 404         init_waitqueue_head(&cli->cl_cache_waiters);
 405         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 406         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 407         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 408         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 409         spin_lock_init(&cli->cl_loi_list_lock);
 410         atomic_set(&cli->cl_pending_w_pages, 0);
 411         atomic_set(&cli->cl_pending_r_pages, 0);
 412         cli->cl_r_in_flight = 0;
 413         cli->cl_w_in_flight = 0;
 414
 415         cli->cl_stats_init = ktime_get_real();
 416         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 417         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 418         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 419         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 420         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 421         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 422         spin_lock_init(&cli->cl_batch_rpc_hist.oh_lock);
 423
 424         /* lru for osc. */
 425         INIT_LIST_HEAD(&cli->cl_lru_osc);
 426         atomic_set(&cli->cl_lru_shrinkers, 0);
 427         atomic_long_set(&cli->cl_lru_busy, 0);
 428         atomic_long_set(&cli->cl_lru_in_list, 0);
 429         INIT_LIST_HEAD(&cli->cl_lru_list);
 430         spin_lock_init(&cli->cl_lru_list_lock);
 431         atomic_long_set(&cli->cl_unstable_count, 0);
 432         INIT_LIST_HEAD(&cli->cl_shrink_list);
 433         INIT_LIST_HEAD(&cli->cl_grant_chain);
 434
 435         INIT_LIST_HEAD(&cli->cl_flight_waiters);
 436         cli->cl_rpcs_in_flight = 0;
 437
 438         init_waitqueue_head(&cli->cl_destroy_waitq);
 439         atomic_set(&cli->cl_destroy_in_flight, 0);
 440
 441
 442         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 443         cli->cl_preferred_cksum_type = 0;
 444 #ifdef CONFIG_ENABLE_CHECKSUM
 445         /* Turn on checksumming by default. */
 446         cli->cl_checksum = 1;
 447         /*
 448          * The supported checksum types will be worked out at connect time
 449          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 450          * through procfs.
 451          */
 452         cli->cl_cksum_type = cli->cl_supp_cksum_types;
 453 #endif
 454         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 455
 456         /*
 457          * Set it to possible maximum size. It may be reduced by ocd_brw_size
 458          * from OFD after connecting.
 459          */
 460         cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 461
 462         cli->cl_max_short_io_bytes = OBD_DEF_SHORT_IO_BYTES;
 463
 464         /*
 465          * set cl_chunkbits default value to PAGE_SHIFT,
 466          * it will be updated at OSC connection time.
 467          */
 468         cli->cl_chunkbits = PAGE_SHIFT;
 469
 470         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 471                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 472         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
 473                 cli->cl_max_rpcs_in_flight = 2;
 474         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
 475                 cli->cl_max_rpcs_in_flight = 3;
 476         } else if (cfs_totalram_pages() >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
 477                 cli->cl_max_rpcs_in_flight = 4;
 478         } else {
 479                 if (osc_on_mdt(obd->obd_name))
 480                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
 481                 else
 482                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 483         }
 484
 485         spin_lock_init(&cli->cl_mod_rpcs_hist.oh_lock);
 486         cli->cl_max_mod_rpcs_in_flight = 0;
 487         cli->cl_mod_rpcs_in_flight = 0;
 488         cli->cl_close_rpcs_in_flight = 0;
 489         init_waitqueue_head(&cli->cl_mod_rpcs_waitq);
 490         cli->cl_mod_rpcs_init = ktime_get_real();
 491         cli->cl_mod_tag_bitmap = NULL;
 492
 493         INIT_LIST_HEAD(&cli->cl_chg_dev_linkage);
 494
 495         if (connect_op == MDS_CONNECT) {
 496                 cli->cl_max_mod_rpcs_in_flight = cli->cl_max_rpcs_in_flight - 1;
 497                 OBD_ALLOC(cli->cl_mod_tag_bitmap,
 498                           BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 499                 if (cli->cl_mod_tag_bitmap == NULL)
 500                         GOTO(err, rc = -ENOMEM);
 501         }
 502
 503         rc = ldlm_get_ref();
 504         if (rc) {
 505                 CERROR("ldlm_get_ref failed: %d\n", rc);
 506                 GOTO(err, rc);
 507         }
 508
 509         ptlrpc_init_client(rq_portal, rp_portal, name,
 510                            &obd->obd_ldlm_client);
 511
 512         imp = class_new_import(obd);
 513         if (imp == NULL)
 514                 GOTO(err_ldlm, rc = -ENOENT);
 515         imp->imp_client = &obd->obd_ldlm_client;
 516         imp->imp_connect_op = connect_op;
 517         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 518                LUSTRE_CFG_BUFLEN(lcfg, 1));
 519         class_import_put(imp);
 520
 521         if (lustre_cfg_buf(lcfg, 4)) {
 522                 __u32 refnet = libcfs_str2net(lustre_cfg_string(lcfg, 4));
 523
 524                 if (refnet == LNET_NET_ANY) {
 525                         rc = -EINVAL;
 526                         CERROR("%s: bad mount option 'network=%s': rc = %d\n",
 527                                obd->obd_name, lustre_cfg_string(lcfg, 4),
 528                                rc);
 529                         GOTO(err_import, rc);
 530                 }
 531                 imp->imp_conn_restricted_net = refnet;
 532         } else {
 533                 imp->imp_conn_restricted_net = LNET_NET_ANY;
 534         }
 535
 536         rc = client_import_add_conn(imp, &server_uuid, 1);
 537         if (rc) {
 538                 CERROR("can't add initial connection\n");
 539                 GOTO(err_import, rc);
 540         }
 541         imp->imp_connection = NULL;
 542
 543         cli->cl_import = imp;
 544         /* cli->cl_max_mds_easize updated by mdc_init_ea_size() */
 545         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 546
 547         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 548                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 549                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 550                                name, obd->obd_name,
 551                                cli->cl_target_uuid.uuid);
 552                         spin_lock(&imp->imp_lock);
 553                         imp->imp_deactive = 1;
 554                         spin_unlock(&imp->imp_lock);
 555                 }
 556         }
 557
 558         obd->obd_namespace = ldlm_namespace_new(obd, obd->obd_name,
 559                                                 LDLM_NAMESPACE_CLIENT,
 560                                                 LDLM_NAMESPACE_GREEDY,
 561                                                 ns_type);
 562         if (IS_ERR(obd->obd_namespace)) {
 563                 rc = PTR_ERR(obd->obd_namespace);
 564                 CERROR("%s: unable to create client namespace: rc = %d\n",
 565                        obd->obd_name, rc);
 566                 obd->obd_namespace = NULL;
 567                 GOTO(err_import, rc);
 568         }
 569
 570         RETURN(rc);
 571
 572 err_import:
 573         class_destroy_import(imp);
 574 err_ldlm:
 575         ldlm_put_ref();
 576 err:
 577         if (cli->cl_mod_tag_bitmap != NULL)
 578                 OBD_FREE(cli->cl_mod_tag_bitmap,
 579                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 580         cli->cl_mod_tag_bitmap = NULL;
 581
 582         RETURN(rc);
 583 }
 584 EXPORT_SYMBOL(client_obd_setup);
 585
 586 int client_obd_cleanup(struct obd_device *obd)
 587 {
 588         struct client_obd *cli = &obd->u.cli;
 589
 590         ENTRY;
 591
 592         ldlm_namespace_free_post(obd->obd_namespace);
 593         obd->obd_namespace = NULL;
 594
 595         obd_cleanup_client_import(obd);
 596         LASSERT(obd->u.cli.cl_import == NULL);
 597
 598         ldlm_put_ref();
 599
 600         if (cli->cl_mod_tag_bitmap != NULL)
 601                 OBD_FREE(cli->cl_mod_tag_bitmap,
 602                          BITS_TO_LONGS(OBD_MAX_RIF_MAX) * sizeof(long));
 603         cli->cl_mod_tag_bitmap = NULL;
 604
 605         RETURN(0);
 606 }
 607 EXPORT_SYMBOL(client_obd_cleanup);
 608
 609 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 610 int client_connect_import(const struct lu_env *env,
 611                           struct obd_export **exp,
 612                           struct obd_device *obd, struct obd_uuid *cluuid,
 613                           struct obd_connect_data *data, void *localdata)
 614 {
 615         struct client_obd *cli = &obd->u.cli;
 616         struct obd_import *imp = cli->cl_import;
 617         struct obd_connect_data *ocd;
 618         struct lustre_handle conn = { 0 };
 619         int rc;
 620
 621         ENTRY;
 622
 623         *exp = NULL;
 624         down_write(&cli->cl_sem);
 625         if (cli->cl_conn_count > 0)
 626                 GOTO(out_sem, rc = -EALREADY);
 627
 628         rc = class_connect(&conn, obd, cluuid);
 629         if (rc)
 630                 GOTO(out_sem, rc);
 631
 632         cli->cl_conn_count++;
 633         *exp = class_conn2export(&conn);
 634
 635         LASSERT(obd->obd_namespace);
 636
 637         spin_lock(&imp->imp_lock);
 638         if (imp->imp_state == LUSTRE_IMP_CLOSED && imp->imp_deactive) {
 639                 /* need to reactivate import if trying to connect
 640                  * to a previously disconnected
 641                  */
 642                 imp->imp_deactive = 0;
 643                 imp->imp_invalid = 0;
 644         }
 645         spin_unlock(&imp->imp_lock);
 646
 647         imp->imp_dlm_handle = conn;
 648         rc = ptlrpc_init_import(imp);
 649         if (rc != 0)
 650                 GOTO(out_ldlm, rc);
 651
 652         ocd = &imp->imp_connect_data;
 653         if (data) {
 654                 *ocd = *data;
 655                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 656                 imp->imp_connect_flags2_orig = data->ocd_connect_flags2;
 657         }
 658
 659         rc = ptlrpc_connect_import(imp);
 660         if (rc != 0) {
 661                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 662                 GOTO(out_ldlm, rc);
 663         }
 664         LASSERT(*exp != NULL && (*exp)->exp_connection);
 665
 666         if (data) {
 667                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 668                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 669                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 670                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 671                 data->ocd_connect_flags2 = ocd->ocd_connect_flags2;
 672         }
 673
 674         ptlrpc_pinger_add_import(imp);
 675
 676         EXIT;
 677
 678         if (rc) {
 679 out_ldlm:
 680                 cli->cl_conn_count--;
 681                 class_disconnect(*exp);
 682                 *exp = NULL;
 683         }
 684 out_sem:
 685         up_write(&cli->cl_sem);
 686
 687         if (!rc && localdata && !cli->cl_cache) {
 688                 cli->cl_cache = (struct cl_client_cache *)localdata;
 689                 cl_cache_incref(cli->cl_cache);
 690                 cli->cl_lru_left = &cli->cl_cache->ccc_lru_left;
 691
 692                 /* add this osc into entity list */
 693                 LASSERT(list_empty(&cli->cl_lru_osc));
 694                 spin_lock(&cli->cl_cache->ccc_lru_lock);
 695                 list_add(&cli->cl_lru_osc, &cli->cl_cache->ccc_lru);
 696                 spin_unlock(&cli->cl_cache->ccc_lru_lock);
 697         }
 698
 699         return rc;
 700 }
 701 EXPORT_SYMBOL(client_connect_import);
 702
 703 int client_disconnect_export(struct obd_export *exp)
 704 {
 705         struct obd_device *obd = class_exp2obd(exp);
 706         struct client_obd *cli;
 707         struct obd_import *imp;
 708         int rc = 0, err;
 709
 710         ENTRY;
 711
 712         if (!obd) {
 713                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 714                        exp, exp ? exp->exp_handle.h_cookie : -1);
 715                 RETURN(-EINVAL);
 716         }
 717
 718         cli = &obd->u.cli;
 719         imp = cli->cl_import;
 720
 721         down_write(&cli->cl_sem);
 722         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
 723                 cli->cl_conn_count);
 724
 725         if (cli->cl_conn_count == 0) {
 726                 CERROR("disconnecting disconnected device (%s)\n",
 727                        obd->obd_name);
 728                 GOTO(out_disconnect, rc = -EINVAL);
 729         }
 730
 731         cli->cl_conn_count--;
 732         if (cli->cl_conn_count != 0)
 733                 GOTO(out_disconnect, rc = 0);
 734
 735         /*
 736          * Mark import deactivated now, so we don't try to reconnect if any
 737          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 738          * fully deactivate the import, or that would drop all requests.
 739          */
 740         spin_lock(&imp->imp_lock);
 741         imp->imp_deactive = 1;
 742         spin_unlock(&imp->imp_lock);
 743
 744         /*
 745          * Some non-replayable imports (MDS's OSCs) are pinged, so just
 746          * delete it regardless.  (It's safe to delete an import that was
 747          * never added.)
 748          */
 749         (void)ptlrpc_pinger_del_import(imp);
 750
 751         if (obd->obd_namespace != NULL) {
 752                 /* obd_force == local only */
 753                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 754                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 755                 ldlm_namespace_free_prior(obd->obd_namespace, imp,
 756                                           obd->obd_force);
 757         }
 758
 759         /*
 760          * There's no need to hold sem while disconnecting an import,
 761          * and it may actually cause deadlock in GSS.
 762          */
 763         up_write(&cli->cl_sem);
 764         rc = ptlrpc_disconnect_import(imp, 0);
 765         down_write(&cli->cl_sem);
 766
 767         ptlrpc_invalidate_import(imp);
 768
 769         EXIT;
 770
 771 out_disconnect:
 772         /*
 773          * Use server style - class_disconnect should be always called for
 774          * o_disconnect.
 775          */
 776         err = class_disconnect(exp);
 777         if (!rc && err)
 778                 rc = err;
 779
 780         up_write(&cli->cl_sem);
 781
 782         RETURN(rc);
 783 }
 784 EXPORT_SYMBOL(client_disconnect_export);
 785
 786 #ifdef HAVE_SERVER_SUPPORT
 787 int server_disconnect_export(struct obd_export *exp)
 788 {
 789         int rc;
 790
 791         ENTRY;
 792
 793         /* Disconnect early so that clients can't keep using export. */
 794         rc = class_disconnect(exp);
 795         /* Close import to avoid sending any requests. */
 796         if (exp->exp_imp_reverse)
 797                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 798
 799         ldlm_bl_thread_wakeup();
 800
 801         /* complete all outstanding replies */
 802         spin_lock(&exp->exp_lock);
 803         while (!list_empty(&exp->exp_outstanding_replies)) {
 804                 struct ptlrpc_reply_state *rs =
 805                         list_first_entry(&exp->exp_outstanding_replies,
 806                                          struct ptlrpc_reply_state,
 807                                          rs_exp_list);
 808                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 809
 810                 spin_lock(&svcpt->scp_rep_lock);
 811
 812                 list_del_init(&rs->rs_exp_list);
 813
 814                 spin_lock(&rs->rs_lock);
 815                 ptlrpc_schedule_difficult_reply(rs);
 816                 spin_unlock(&rs->rs_lock);
 817
 818                 spin_unlock(&svcpt->scp_rep_lock);
 819         }
 820         spin_unlock(&exp->exp_lock);
 821
 822         RETURN(rc);
 823 }
 824 EXPORT_SYMBOL(server_disconnect_export);
 825
 826 static inline int target_check_recovery_timer(struct obd_device *target)
 827 {
 828         ktime_t remaining;
 829         s64 timeout;
 830
 831         if (!target->obd_recovering || target->obd_recovery_start == 0)
 832                 return 0;
 833
 834         remaining = hrtimer_get_remaining(&target->obd_recovery_timer);
 835         timeout = ktime_divns(remaining, NSEC_PER_SEC);
 836         if (timeout > -30)
 837                 return 0;
 838
 839         /* the recovery timer should expire, but it isn't triggered,
 840          * it's better to abort the recovery of this target to speed up
 841          * the recovery of the whole cluster. */
 842         spin_lock(&target->obd_dev_lock);
 843         if (target->obd_recovering) {
 844                 CERROR("%s: Aborting recovery\n", target->obd_name);
 845                 target->obd_abort_recovery = 1;
 846                 wake_up(&target->obd_next_transno_waitq);
 847         }
 848         spin_unlock(&target->obd_dev_lock);
 849         return 0;
 850 }
 851
 852 /*
 853  * --------------------------------------------------------------------------
 854  * from old lib/target.c
 855  * --------------------------------------------------------------------------
 856  */
 857 static int target_handle_reconnect(struct lustre_handle *conn,
 858                                    struct obd_export *exp,
 859                                    struct obd_uuid *cluuid)
 860 {
 861         struct obd_device *target;
 862         struct lustre_handle *hdl;
 863         ktime_t remaining;
 864         s64 timeout;
 865         int rc = 0;
 866
 867         ENTRY;
 868         hdl = &exp->exp_imp_reverse->imp_remote_handle;
 869         if (!exp->exp_connection || !lustre_handle_is_used(hdl)) {
 870                 conn->cookie = exp->exp_handle.h_cookie;
 871                 CDEBUG(D_HA,
 872                        "connect export for UUID '%s' at %p, cookie %#llx\n",
 873                        cluuid->uuid, exp, conn->cookie);
 874                 RETURN(0);
 875         }
 876
 877         target = exp->exp_obd;
 878
 879         /* Might be a re-connect after a partition. */
 880         if (memcmp(&conn->cookie, &hdl->cookie, sizeof(conn->cookie))) {
 881                 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",
 882                               target->obd_name,
 883                               obd_uuid2str(&exp->exp_client_uuid),
 884                               obd_export_nid2str(exp),
 885                               hdl->cookie, conn->cookie);
 886                 memset(conn, 0, sizeof(*conn));
 887                 /*
 888                  * target_handle_connect() treats EALREADY and
 889                  * -EALREADY differently.  -EALREADY is an error
 890                  * (same UUID, different handle).
 891                  */
 892                 RETURN(-EALREADY);
 893         }
 894
 895         if (!target->obd_recovering) {
 896                 LCONSOLE_WARN("%s: Client %s (at %s) reconnecting\n",
 897                         target->obd_name, obd_uuid2str(&exp->exp_client_uuid),
 898                         obd_export_nid2str(exp));
 899                 GOTO(out_already, rc);
 900         }
 901
 902         remaining = hrtimer_get_remaining(&target->obd_recovery_timer);
 903         timeout = ktime_divns(remaining, NSEC_PER_SEC);
 904         if (timeout > 0) {
 905                 LCONSOLE_WARN("%s: Client %s (at %s) reconnected, waiting for %d clients in recovery for %lld:%.02lld\n",
 906                               target->obd_name,
 907                               obd_uuid2str(&exp->exp_client_uuid),
 908                               obd_export_nid2str(exp),
 909                               atomic_read(&target->obd_max_recoverable_clients),
 910                               timeout / 60, timeout % 60);
 911         } else {
 912                 struct target_distribute_txn_data *tdtd;
 913                 int size = 0;
 914                 int count = 0;
 915                 char *buf = NULL;
 916
 917                 target_check_recovery_timer(target);
 918
 919                 tdtd = class_exp2tgt(exp)->lut_tdtd;
 920                 if (tdtd && tdtd->tdtd_show_update_logs_retrievers)
 921                         buf = tdtd->tdtd_show_update_logs_retrievers(
 922                                 tdtd->tdtd_show_retrievers_cbdata,
 923                                 &size, &count);
 924
 925                 if (count > 0)
 926                         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",
 927                                       target->obd_name,
 928                                       obd_uuid2str(&exp->exp_client_uuid),
 929                                       obd_export_nid2str(exp), count,
 930                                       buf ? buf : "unknown (not enough RAM)",
 931                                       (abs(timeout) + target->obd_recovery_timeout) / 60,
 932                                       (abs(timeout) + target->obd_recovery_timeout) % 60,
 933                                       target->obd_name);
 934                 else
 935                         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",
 936                                       target->obd_name, abs(timeout) / 60,
 937                                       abs(timeout) % 60, target->obd_name);
 938
 939                 if (buf != NULL)
 940                         OBD_FREE(buf, size);
 941         }
 942
 943 out_already:
 944         conn->cookie = exp->exp_handle.h_cookie;
 945         /*
 946          * target_handle_connect() treats EALREADY and
 947          * -EALREADY differently.  EALREADY means we are
 948          * doing a valid reconnect from the same client.
 949          */
 950         RETURN(EALREADY);
 951 }
 952
 953 static void
 954 check_and_start_recovery_timer(struct obd_device *obd,
 955                                struct ptlrpc_request *req, int new_client);
 956
 957 /**
 958  * update flags for import during reconnect process
 959  */
 960 static int rev_import_flags_update(struct obd_import *revimp,
 961                                    struct ptlrpc_request *req)
 962 {
 963         int rc;
 964         struct obd_connect_data *data;
 965
 966         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 967
 968         if (data->ocd_connect_flags & OBD_CONNECT_AT)
 969                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 970         else
 971                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 972
 973         revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
 974
 975         revimp->imp_connect_data = *data;
 976         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
 977         if (rc) {
 978                 CERROR("%s: cannot get reverse import %s security: rc = %d\n",
 979                         revimp->imp_client->cli_name,
 980                         libcfs_idstr(&req->rq_peer), rc);
 981                 return rc;
 982         }
 983
 984         return 0;
 985 }
 986
 987 /**
 988  * Allocate a new reverse import for an export.
 989  *
 990  * \retval -errno in case error hit
 991  * \retval 0 if reverse import correctly init
 992  **/
 993 int rev_import_init(struct obd_export *export)
 994 {
 995         struct obd_device *obd = export->exp_obd;
 996         struct obd_import *revimp;
 997
 998         LASSERT(export->exp_imp_reverse == NULL);
 999
1000         revimp = class_new_import(obd);
1001         if (revimp == NULL)
1002                 return -ENOMEM;
1003
1004         revimp->imp_remote_handle.cookie = 0ULL;
1005         revimp->imp_client = &obd->obd_ldlm_client;
1006         revimp->imp_dlm_fake = 1;
1007
1008         /* it is safe to connect import in new state as no sends possible */
1009         spin_lock(&export->exp_lock);
1010         export->exp_imp_reverse = revimp;
1011         spin_unlock(&export->exp_lock);
1012         class_import_put(revimp);
1013
1014         return 0;
1015 }
1016 EXPORT_SYMBOL(rev_import_init);
1017
1018 /**
1019  * Handle reconnect for an export.
1020  *
1021  * \param exp export to handle reconnect process
1022  * \param req client reconnect request
1023  *
1024  * \retval -rc in case securitfy flavor can't be changed
1025  * \retval 0 in case none problems
1026  */
1027 static int rev_import_reconnect(struct obd_export *exp,
1028                                 struct ptlrpc_request *req)
1029 {
1030         struct obd_import *revimp = exp->exp_imp_reverse;
1031         struct lustre_handle *lh;
1032         int rc;
1033
1034         /* avoid sending a request until import flags are changed */
1035         ptlrpc_import_enter_resend(revimp);
1036
1037         ptlrpc_connection_put(revimp->imp_connection);
1038
1039         /*
1040          * client from recovery don't have a handle so we need to take from
1041          * request. it may produce situation when wrong client connected
1042          * to recovery as we trust a client uuid
1043          */
1044         lh = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1045         revimp->imp_remote_handle = *lh;
1046
1047         /*
1048          * unknown versions will be caught in
1049          * ptlrpc_handle_server_req_in->lustre_unpack_msg()
1050          */
1051         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1052
1053         revimp->imp_connection = ptlrpc_connection_addref(exp->exp_connection);
1054
1055         rc = rev_import_flags_update(revimp, req);
1056         if (rc != 0) {
1057                 /*
1058                  * it is safe to still be in RECOVERY phase as we are not able
1059                  * to setup correct security flavor so requests are not able to
1060                  * be delivered correctly
1061                  */
1062                 return rc;
1063         }
1064
1065         /* resend all rpc's via new connection */
1066         return ptlrpc_import_recovery_state_machine(revimp);
1067 }
1068
1069 int target_handle_connect(struct ptlrpc_request *req)
1070 {
1071         struct obd_device *target = NULL;
1072         struct obd_export *export = NULL;
1073         /*
1074          * connect handle - filled from target_handle_reconnect in
1075          * reconnect case
1076          */
1077         struct lustre_handle conn;
1078         struct lustre_handle *tmp;
1079         struct obd_uuid cluuid;
1080         char *str;
1081         int rc = 0;
1082         char *target_start;
1083         int target_len;
1084         bool mds_conn = false, lw_client = false, initial_conn = false;
1085         bool mds_mds_conn = false;
1086         bool new_mds_mds_conn = false;
1087         struct obd_connect_data *data, *tmpdata;
1088         int size, tmpsize;
1089 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1090         int tmp_exp_old_falloc;
1091 #endif
1092         struct ptlrpc_connection *pcon = NULL;
1093         bool reconnected = false;
1094
1095         ENTRY;
1096
1097         CFS_RACE(OBD_FAIL_TGT_CONN_RACE);
1098
1099         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
1100         if (str == NULL) {
1101                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
1102                 GOTO(out, rc = -EINVAL);
1103         }
1104
1105         target = class_str2obd(str);
1106         if (!target) {
1107                 deuuidify(str, NULL, &target_start, &target_len);
1108                 LCONSOLE_ERROR_MSG(0x137,
1109                                    "%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",
1110                                    str, libcfs_nidstr(&req->rq_peer.nid));
1111                 GOTO(out, rc = -ENODEV);
1112         }
1113
1114         spin_lock(&target->obd_dev_lock);
1115
1116         target->obd_conn_inprogress++;
1117
1118         if (target->obd_stopping || !target->obd_set_up) {
1119                 spin_unlock(&target->obd_dev_lock);
1120
1121                 deuuidify(str, NULL, &target_start, &target_len);
1122                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
1123                               target_len, target_start,
1124                               libcfs_nidstr(&req->rq_peer.nid),
1125                               (target->obd_stopping ?
1126                                "stopping" : "not set up"));
1127                 GOTO(out, rc = -ENODEV);
1128         }
1129
1130         if (target->obd_no_conn) {
1131                 spin_unlock(&target->obd_dev_lock);
1132
1133                 CDEBUG(D_INFO,
1134                        "%s: Temporarily refusing client connection from %s\n",
1135                        target->obd_name, libcfs_nidstr(&req->rq_peer.nid));
1136                 GOTO(out, rc = -EAGAIN);
1137         }
1138
1139         spin_unlock(&target->obd_dev_lock);
1140
1141         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
1142         if (str == NULL) {
1143                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
1144                 GOTO(out, rc = -EINVAL);
1145         }
1146
1147         obd_str2uuid(&cluuid, str);
1148
1149         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1150         if (tmp == NULL)
1151                 GOTO(out, rc = -EPROTO);
1152
1153         conn = *tmp;
1154
1155         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1156                                     RCL_CLIENT);
1157         if (size < 0 || size > 8 * sizeof(struct obd_connect_data))
1158                 GOTO(out, rc = -EPROTO);
1159         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
1160         if (!data)
1161                 GOTO(out, rc = -EPROTO);
1162
1163         rc = req_capsule_server_pack(&req->rq_pill);
1164         if (rc)
1165                 GOTO(out, rc);
1166
1167 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1168         /*
1169          * Don't allow clients to connect that are using old 1.8 format
1170          * protocol conventions (LUSTRE_MSG_MAGIC_v1, !MSGHDR_CKSUM_INCOMPAT18,
1171          * ldlm_flock_policy_wire format, MDT_ATTR_xTIME_SET, etc).  The
1172          * FULL20 flag should be set on all connections since 2.0, but no
1173          * longer affects behaviour.
1174          *
1175          * Later this check will be disabled and the flag can be retired
1176          * completely once interop with 3.0 is no longer needed.
1177          */
1178         if (!(data->ocd_connect_flags & OBD_CONNECT_FULL20))
1179                 GOTO(out, rc = -EPROTO);
1180
1181         /* Old clients will have 'tmp_exp_old_falloc' as 1.
1182          * Newer clients (2.15) and beyond will have it set as 0
1183          */
1184         tmp_exp_old_falloc =
1185                 !!(data->ocd_connect_flags & OBD_CONNECT_OLD_FALLOC);
1186
1187         CDEBUG(D_INFO, "%s: ocd_connect_flags: %#llx tmp_exp_old_falloc: %d\n",
1188                target->obd_name, data->ocd_connect_flags, tmp_exp_old_falloc);
1189
1190         /*
1191          * Don't allow liblustre clients to connect.
1192          * - testing was disabled in v2_2_50_0-61-g6a75d65
1193          * - building was disabled in v2_5_58_0-28-g7277179
1194          * - client code was deleted in v2_6_50_0-101-gcdfbc72,
1195          * - clients were refused connect for version difference > 0.0.1.32
1196          */
1197         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1198                 DEBUG_REQ(D_WARNING, req, "Refusing libclient connection");
1199                 GOTO(out, rc = -EPROTO);
1200         }
1201 #endif
1202
1203         /*
1204          * Note: lw_client is needed in MDS-MDS failover during update log
1205          * processing, so we needs to allow lw_client to be connected at
1206          * anytime, instead of only the initial connection
1207          */
1208         lw_client = OCD_HAS_FLAG(data, LIGHTWEIGHT);
1209
1210         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
1211                 initial_conn = true;
1212                 mds_conn = OCD_HAS_FLAG(data, MDS);
1213                 mds_mds_conn = OCD_HAS_FLAG(data, MDS_MDS);
1214
1215                 /*
1216                  * OBD_CONNECT_MNE_SWAB is removed at 2.14
1217                  * Checking OBD_CONNECT_FID can be removed in the future.
1218                  *
1219                  * Via check OBD_CONNECT_FID, we can distinguish whether
1220                  * the OBD_CONNECT_MDS_MDS/OBD_CONNECT_MNE_SWAB is from
1221                  * MGC or MDT, since MGC does not use OBD_CONNECT_FID.
1222                  */
1223                 if (!lw_client &&
1224                     (data->ocd_connect_flags & OBD_CONNECT_MDS_MDS) &&
1225                     (data->ocd_connect_flags & OBD_CONNECT_FID) &&
1226                     (data->ocd_connect_flags & OBD_CONNECT_VERSION)) {
1227                         __u32 major = OBD_OCD_VERSION_MAJOR(data->ocd_version);
1228                         __u32 minor = OBD_OCD_VERSION_MINOR(data->ocd_version);
1229                         __u32 patch = OBD_OCD_VERSION_PATCH(data->ocd_version);
1230
1231                         /*
1232                          * We do not support the MDT-MDT interoperations with
1233                          * different version MDT because of protocol changes.
1234                          */
1235                         if (unlikely(major != LUSTRE_MAJOR ||
1236                                      minor != LUSTRE_MINOR ||
1237                                      abs(patch - LUSTRE_PATCH) > 3)) {
1238                                 LCONSOLE_WARN("%s (%u.%u.%u.%u) refused the connection from different version MDT (%d.%d.%d.%d) %s %s\n",
1239                                               target->obd_name, LUSTRE_MAJOR,
1240                                               LUSTRE_MINOR, LUSTRE_PATCH,
1241                                               LUSTRE_FIX, major, minor, patch,
1242                                               OBD_OCD_VERSION_FIX(data->ocd_version),
1243                                               libcfs_nidstr(&req->rq_peer.nid),
1244                                               str);
1245                                 GOTO(out, rc = -EPROTO);
1246                         }
1247                 }
1248         }
1249
1250         /* lctl gets a backstage, all-access pass. */
1251         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
1252                 goto dont_check_exports;
1253
1254         export = obd_uuid_lookup(target, &cluuid);
1255         if (!export)
1256                 goto no_export;
1257
1258         /* We've found an export in the hash. */
1259
1260         spin_lock(&export->exp_lock);
1261
1262         if (export->exp_connecting) { /* b=9635, et. al. */
1263                 spin_unlock(&export->exp_lock);
1264                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
1265                               export->exp_obd->obd_name, export,
1266                               libcfs_nidstr(&req->rq_peer.nid));
1267                 class_export_put(export);
1268                 export = NULL;
1269                 rc = -EALREADY;
1270         } else if ((mds_conn || (lw_client && initial_conn) ||
1271                    OCD_HAS_FLAG(data, MDS_MDS)) && export->exp_connection) {
1272                 spin_unlock(&export->exp_lock);
1273                 if (!nid_same(&req->rq_peer.nid,
1274                               &export->exp_connection->c_peer.nid)) {
1275                         /* MDS or LWP reconnected after failover. */
1276                         LCONSOLE_WARN("%s: Received %s connection from %s, removing former export from %s\n",
1277                                       target->obd_name,
1278                                       lw_client ? "LWP" : "MDS",
1279                                       libcfs_nidstr(&req->rq_peer.nid),
1280                                       libcfs_nidstr(&export->exp_connection->c_peer.nid));
1281                 } else {
1282                         /* New connection from the same NID. */
1283                         LCONSOLE_WARN("%s: Received new %s connection from %s, %s former export from same NID\n",
1284                                       target->obd_name,
1285                                       lw_client ? "LWP" : "MDS",
1286                                       libcfs_nidstr(&req->rq_peer.nid),
1287                                       OCD_HAS_FLAG(data, MDS_MDS) ?
1288                                       "keep" : "remove");
1289                 }
1290
1291                 if (nid_same(&req->rq_peer.nid,
1292                              &export->exp_connection->c_peer.nid) &&
1293                     OCD_HAS_FLAG(data, MDS_MDS)) {
1294                         /*
1295                          * Because exports between MDTs will always be
1296                          * kept, let's do not fail such export if they
1297                          * come from the same NID, otherwise it might
1298                          * cause eviction between MDTs, which might
1299                          * cause namespace inconsistency
1300                          */
1301                         spin_lock(&export->exp_lock);
1302                         export->exp_connecting = 1;
1303                         export->exp_conn_cnt = 0;
1304                         spin_unlock(&export->exp_lock);
1305                         conn.cookie = export->exp_handle.h_cookie;
1306                         rc = EALREADY;
1307                 } else {
1308                         class_fail_export(export);
1309                         class_export_put(export);
1310                         export = NULL;
1311                         rc = 0;
1312                 }
1313         } else if (export->exp_connection != NULL && initial_conn &&
1314                    !nid_same(&req->rq_peer.nid,
1315                              &export->exp_connection->c_peer.nid)) {
1316                 spin_unlock(&export->exp_lock);
1317                 /* In MDS failover we have static UUID but NID can change. */
1318                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when existing nid %s is already connected\n",
1319                               target->obd_name, cluuid.uuid,
1320                               libcfs_nidstr(&req->rq_peer.nid),
1321                               libcfs_nidstr(
1322                                       &export->exp_connection->c_peer.nid));
1323                 rc = -EALREADY;
1324                 class_export_put(export);
1325                 export = NULL;
1326         } else if (CFS_FAIL_PRECHECK(OBD_FAIL_TGT_RECOVERY_CONNECT) &&
1327                    !lw_client) {
1328                 spin_unlock(&export->exp_lock);
1329                 rc = -EAGAIN;
1330         } else {
1331                 export->exp_connecting = 1;
1332                 spin_unlock(&export->exp_lock);
1333                 LASSERT(export->exp_obd == target);
1334
1335                 rc = target_handle_reconnect(&conn, export, &cluuid);
1336         }
1337
1338         /* If we found an export, we already unlocked. */
1339         if (!export) {
1340 no_export:
1341                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
1342         } else if (req->rq_export == NULL &&
1343                    atomic_read(&export->exp_rpc_count) > 0) {
1344                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, still busy with %d references\n",
1345                               target->obd_name, cluuid.uuid,
1346                               libcfs_nidstr(&req->rq_peer.nid),
1347                               refcount_read(&export->exp_handle.h_ref));
1348                         GOTO(out, rc = -EBUSY);
1349         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
1350                    rc != EALREADY) {
1351                 if (!strstr(cluuid.uuid, "mdt"))
1352                         LCONSOLE_WARN("%s: Rejecting reconnect from the known client %s (at %s) because it is indicating it is a new client\n",
1353                                       target->obd_name, cluuid.uuid,
1354                                       libcfs_nidstr(&req->rq_peer.nid));
1355                 GOTO(out, rc = -EALREADY);
1356         } else {
1357                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
1358         }
1359
1360         if (rc < 0)
1361                 GOTO(out, rc);
1362
1363         CDEBUG(D_HA, "%s: connection from %s@%s %st%llu exp %p cur %lld last %lld\n",
1364                target->obd_name, cluuid.uuid, libcfs_nidstr(&req->rq_peer.nid),
1365                target->obd_recovering ? "recovering/" : "", data->ocd_transno,
1366                export, ktime_get_seconds(),
1367                export ? export->exp_last_request_time : 0);
1368
1369         /*
1370          * If this is the first time a client connects, reset the recovery
1371          * timer. Discard lightweight connections which might be local.
1372          */
1373         if (!lw_client && rc == 0 && target->obd_recovering)
1374                 check_and_start_recovery_timer(target, req, export == NULL);
1375
1376         /*
1377          * We want to handle EALREADY but *not* -EALREADY from
1378          * target_handle_reconnect(), return reconnection state in a flag.
1379          */
1380         if (rc == EALREADY) {
1381                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1382                 rc = 0;
1383         } else {
1384                 LASSERT(rc == 0);
1385         }
1386
1387         /* Tell the client if we support replayable requests. */
1388         if (target->obd_replayable)
1389                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1390
1391         if (export == NULL) {
1392                 /* allow lightweight connections during recovery */
1393                 /*
1394                  * allow "new" MDT to be connected during recovery, since we
1395                  * need retrieve recovery update records from it
1396                  */
1397                 if (target->obd_recovering && !lw_client && !mds_mds_conn) {
1398                         struct hrtimer *timer = &target->obd_recovery_timer;
1399                         ktime_t remaining;
1400                         s64 timeout, left;
1401                         int in_progress;
1402                         int connected;
1403                         int known;
1404                         int stale;
1405                         char *msg;
1406
1407                         connected = atomic_read(&target->obd_connected_clients);
1408                         in_progress = atomic_read(&target->obd_lock_replay_clients);
1409                         known =
1410                            atomic_read(&target->obd_max_recoverable_clients);
1411                         stale = target->obd_stale_clients;
1412                         remaining = hrtimer_get_remaining(timer);
1413                         left = ktime_divns(remaining, NSEC_PER_SEC);
1414
1415                         if (ktime_to_ns(remaining) > 0) {
1416                                 msg = "to recover in";
1417                                 timeout = left;
1418                         } else {
1419                                 msg = "already passed deadline";
1420                                 timeout = -left;
1421
1422                                 target_check_recovery_timer(target);
1423                         }
1424
1425                         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",
1426                                       target->obd_name, cluuid.uuid,
1427                                       libcfs_nidstr(&req->rq_peer.nid), known,
1428                                       connected - in_progress, in_progress,
1429                                       stale, msg, timeout / 60, timeout % 60);
1430                         rc = -EBUSY;
1431                 } else {
1432 dont_check_exports:
1433                         rc = obd_connect(req->rq_svc_thread->t_env,
1434                                          &export, target, &cluuid, data,
1435                                          &req->rq_peer.nid);
1436                         if (mds_conn && CFS_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1437                                 lustre_msg_add_op_flags(req->rq_repmsg,
1438                                                         MSG_CONNECT_RECOVERING);
1439                         if (rc == 0) {
1440                                 conn.cookie = export->exp_handle.h_cookie;
1441                                 rc = rev_import_init(export);
1442                         }
1443
1444                         if (mds_mds_conn)
1445                                 new_mds_mds_conn = true;
1446                 }
1447         } else {
1448                 if (CFS_FAIL_CHECK(OBD_FAIL_MDS_CONNECT_VS_EVICT)) {
1449                         class_export_get(export);
1450                         class_fail_export(export);
1451                         class_export_put(export);
1452                 }
1453                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1454                                    export, target, &cluuid, data,
1455                                    &req->rq_peer.nid);
1456                 if (rc == 0)
1457                         reconnected = true;
1458         }
1459         if (rc)
1460                 GOTO(out, rc);
1461
1462         data->ocd_instance = obd2obt(target)->obt_instance;
1463
1464         /*
1465          * Return only the parts of obd_connect_data that we understand, so the
1466          * client knows that we don't understand the rest.
1467          */
1468         if (data) {
1469                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1470                                                RCL_SERVER);
1471                 tmpdata = req_capsule_server_get(&req->rq_pill,
1472                                                  &RMF_CONNECT_DATA);
1473                 /*
1474                  * Don't use struct assignment here, because the client reply
1475                  * buffer may be smaller/larger than the local struct
1476                  * obd_connect_data.
1477                  */
1478                 memcpy(tmpdata, data, min(tmpsize, size));
1479         }
1480
1481         /*
1482          * If the client and the server are the same node, we will already
1483          * have an export that really points to the client's DLM export,
1484          * because we have a shared handles table.
1485          *
1486          * XXX this will go away when shaver stops sending the "connect" handle
1487          * in the real "remote handle" field of the request --phik 24 Apr 2003
1488          */
1489         ptlrpc_request_change_export(req, export);
1490
1491         pcon = ptlrpc_connection_get(&req->rq_peer,
1492                                      &req->rq_self, &cluuid);
1493         if (pcon == NULL)
1494                 GOTO(out, rc = -ENOTCONN);
1495
1496         spin_lock(&export->exp_lock);
1497
1498         if (export->exp_disconnected) {
1499                 spin_unlock(&export->exp_lock);
1500                 if (reconnected) {
1501                         /*
1502                          * for each connect called disconnect
1503                          * should be called to cleanup stuff
1504                          */
1505                         class_export_get(export);
1506                         obd_disconnect(export);
1507                 }
1508
1509                 GOTO(out, rc = -ENODEV);
1510         }
1511         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1512                 spin_unlock(&export->exp_lock);
1513                 CDEBUG(D_RPCTRACE,
1514                        "%s: %s already connected at greater or equal conn_cnt: %d >= %d\n",
1515                        cluuid.uuid, libcfs_nidstr(&req->rq_peer.nid),
1516                        export->exp_conn_cnt,
1517                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1518
1519                 GOTO(out, rc = -EALREADY);
1520         }
1521         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1522         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1523
1524 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
1525         /* make 'tmp_exp_old_falloc' persistent by saving it into
1526          * server side export object(obd_export)
1527          */
1528         export->exp_old_falloc = tmp_exp_old_falloc;
1529 #endif
1530
1531         /* Check to see if connection came from another NID. */
1532         if (export->exp_connection != NULL &&
1533             !nid_same(&export->exp_connection->c_peer.nid,
1534                       &req->rq_peer.nid)) {
1535                 obd_nid_del(export->exp_obd, export);
1536                 ptlrpc_connection_put(export->exp_connection);
1537                 export->exp_connection = NULL;
1538         }
1539
1540         if (export->exp_connection == NULL) {
1541                 export->exp_connection = pcon;
1542                 pcon = NULL;
1543         }
1544         obd_nid_add(export->exp_obd, export);
1545
1546         spin_unlock(&export->exp_lock);
1547
1548         lustre_msg_set_handle(req->rq_repmsg, &conn);
1549
1550         rc = rev_import_reconnect(export, req);
1551         if (rc != 0)
1552                 GOTO(out, rc);
1553
1554         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1555                 int has_transno;
1556                 __u64 transno = data->ocd_transno;
1557
1558                 spin_lock(&export->exp_lock);
1559                 /*
1560                  * possible race with class_disconnect_stale_exports,
1561                  * export may be already in the eviction process
1562                  */
1563                 if (export->exp_failed) {
1564                         spin_unlock(&export->exp_lock);
1565                         GOTO(out, rc = -ENODEV);
1566                 }
1567                 export->exp_in_recovery = 1;
1568                 export->exp_req_replay_needed = 1;
1569                 export->exp_lock_replay_needed = 1;
1570                 spin_unlock(&export->exp_lock);
1571
1572                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1573                                  MSG_CONNECT_TRANSNO);
1574                 if (has_transno && transno == 0)
1575                         CWARN("Connect with zero transno!\n");
1576
1577                 if (has_transno && transno > 0 &&
1578                     transno < target->obd_next_recovery_transno &&
1579                     transno > target->obd_last_committed) {
1580                         /* Another way is to use cmpxchg() to be lock-free. */
1581                         spin_lock(&target->obd_recovery_task_lock);
1582                         if (transno < target->obd_next_recovery_transno)
1583                                 target->obd_next_recovery_transno = transno;
1584                         spin_unlock(&target->obd_recovery_task_lock);
1585                 }
1586
1587                 atomic_inc(&target->obd_req_replay_clients);
1588                 atomic_inc(&target->obd_lock_replay_clients);
1589                 /*
1590                  * Note: MDS-MDS connection is allowed to be connected during
1591                  * recovery, no matter if the exports needs to be recoveried.
1592                  * Because we need retrieve updates logs from all other MDTs.
1593                  * So if the MDS-MDS export is new, obd_max_recoverable_clients
1594                  * also needs to be increased to match other recovery checking
1595                  * condition.
1596                  */
1597                 if (new_mds_mds_conn)
1598                         atomic_inc(&target->obd_max_recoverable_clients);
1599
1600                 if (atomic_inc_return(&target->obd_connected_clients) ==
1601                     atomic_read(&target->obd_max_recoverable_clients))
1602                         wake_up(&target->obd_next_transno_waitq);
1603         }
1604
1605         /* Tell the client we're in recovery, when client is involved in it. */
1606         if (target->obd_recovering && !lw_client)
1607                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1608
1609 out:
1610         if (export) {
1611                 spin_lock(&export->exp_lock);
1612                 export->exp_connecting = 0;
1613                 spin_unlock(&export->exp_lock);
1614
1615                 class_export_put(export);
1616         }
1617         if (target != NULL) {
1618                 spin_lock(&target->obd_dev_lock);
1619                 target->obd_conn_inprogress--;
1620                 spin_unlock(&target->obd_dev_lock);
1621                 class_decref(target, "find", current);
1622         }
1623         if (pcon)
1624                 ptlrpc_connection_put(pcon);
1625         req->rq_status = rc;
1626         RETURN(rc);
1627 }
1628
1629 int target_handle_disconnect(struct ptlrpc_request *req)
1630 {
1631         int rc;
1632
1633         ENTRY;
1634
1635         rc = req_capsule_server_pack(&req->rq_pill);
1636         if (rc)
1637                 RETURN(rc);
1638
1639         /* In case of target disconnect, updating sec ctx immediately is
1640          * required in order to record latest sequence number used.
1641          * Sequence is normally updated on export destroy, but this event
1642          * can occur too late, ie after a new target connect request has
1643          * been processed.
1644          * Maintaining correct sequence when client connection becomes idle
1645          * ensures that GSS does not erroneously consider requests as replays.
1646          */
1647         rc = sptlrpc_export_update_ctx(req->rq_export);
1648         if (rc)
1649                 RETURN(rc);
1650
1651         /* Keep the rq_export around so we can send the reply. */
1652         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1653
1654         RETURN(0);
1655 }
1656
1657 void target_destroy_export(struct obd_export *exp)
1658 {
1659         struct obd_import *imp = NULL;
1660         /*
1661          * exports created from last_rcvd data, and "fake"
1662          * exports created by lctl don't have an import
1663          */
1664         spin_lock(&exp->exp_lock);
1665         if (exp->exp_imp_reverse != NULL) {
1666                 imp = exp->exp_imp_reverse;
1667                 exp->exp_imp_reverse = NULL;
1668         }
1669         spin_unlock(&exp->exp_lock);
1670         if (imp != NULL)
1671                 client_destroy_import(imp);
1672
1673         LASSERT(atomic_read(&exp->exp_locks_count) == 0);
1674         LASSERT(atomic_read(&exp->exp_rpc_count) == 0);
1675         LASSERT(atomic_read(&exp->exp_cb_count) == 0);
1676         LASSERT(atomic_read(&exp->exp_replay_count) == 0);
1677 }
1678 EXPORT_SYMBOL(target_destroy_export);
1679
1680 /*
1681  * Recovery functions
1682  */
1683 static void target_request_copy_get(struct ptlrpc_request *req)
1684 {
1685         class_export_rpc_inc(req->rq_export);
1686         LASSERT(list_empty(&req->rq_list));
1687         INIT_LIST_HEAD(&req->rq_replay_list);
1688
1689         /* Increase refcount to keep request in queue. */
1690         atomic_inc(&req->rq_refcount);
1691         /* Let export know it has replays to be handled. */
1692         atomic_inc(&req->rq_export->exp_replay_count);
1693 }
1694
1695 static void target_request_copy_put(struct ptlrpc_request *req)
1696 {
1697         LASSERT(list_empty(&req->rq_replay_list));
1698         LASSERT(atomic_read(&(req)->rq_export->exp_replay_count) > 0);
1699
1700         atomic_dec(&req->rq_export->exp_replay_count);
1701         class_export_rpc_dec(req->rq_export);
1702         ptlrpc_server_drop_request(req);
1703 }
1704
1705 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1706 {
1707         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1708         struct obd_export *exp = req->rq_export;
1709         struct ptlrpc_request *reqiter;
1710         struct ptlrpc_request *dup_req = NULL;
1711         int dup = 0;
1712
1713         LASSERT(exp);
1714
1715         spin_lock(&exp->exp_lock);
1716         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1717                             rq_replay_list) {
1718                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1719                         dup_req = reqiter;
1720                         dup = 1;
1721                         break;
1722                 }
1723         }
1724
1725         if (dup) {
1726                 /* We expect it with RESENT and REPLAY flags. */
1727                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1728                     (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1729                         CERROR("invalid flags %x of resent replay\n",
1730                                lustre_msg_get_flags(req->rq_reqmsg));
1731
1732                 if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REPLAY) {
1733                         __u32 new_conn;
1734
1735                         new_conn = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1736                         if (new_conn >
1737                             lustre_msg_get_conn_cnt(dup_req->rq_reqmsg))
1738                                 lustre_msg_set_conn_cnt(dup_req->rq_reqmsg,
1739                                                         new_conn);
1740                 }
1741         } else {
1742                 list_add_tail(&req->rq_replay_list,
1743                               &exp->exp_req_replay_queue);
1744         }
1745
1746         spin_unlock(&exp->exp_lock);
1747         return dup;
1748 }
1749
1750 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1751 {
1752         LASSERT(!list_empty(&req->rq_replay_list));
1753         LASSERT(req->rq_export);
1754
1755         spin_lock(&req->rq_export->exp_lock);
1756         list_del_init(&req->rq_replay_list);
1757         spin_unlock(&req->rq_export->exp_lock);
1758 }
1759
1760 static void target_finish_recovery(struct lu_target *lut)
1761 {
1762         struct obd_device *obd = lut->lut_obd;
1763
1764         ENTRY;
1765
1766         /* Only log a recovery message when recovery has occurred. */
1767         if (obd->obd_recovery_start) {
1768                 time64_t now = ktime_get_seconds();
1769                 time64_t elapsed_time;
1770
1771                 elapsed_time = max_t(time64_t, now - obd->obd_recovery_start,
1772                                      1);
1773                 LCONSOLE_INFO("%s: Recovery over after %lld:%.02lld, of %d clients %d recovered and %d %s evicted.\n",
1774                               obd->obd_name, elapsed_time / 60,
1775                               elapsed_time % 60,
1776                               atomic_read(&obd->obd_max_recoverable_clients),
1777                               atomic_read(&obd->obd_connected_clients),
1778                               obd->obd_stale_clients,
1779                               obd->obd_stale_clients == 1 ? "was" : "were");
1780                 if (obd->obd_stale_clients && do_dump_on_eviction(obd))
1781                         libcfs_debug_dumplog();
1782         }
1783
1784         ldlm_reprocess_recovery_done(obd->obd_namespace);
1785         spin_lock(&obd->obd_recovery_task_lock);
1786         if (!list_empty(&obd->obd_req_replay_queue) ||
1787             !list_empty(&obd->obd_lock_replay_queue) ||
1788             !list_empty(&obd->obd_final_req_queue)) {
1789                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1790                        obd->obd_name,
1791                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1792                        list_empty(&obd->obd_lock_replay_queue) ? \
1793                                   "" : "lock ",
1794                        list_empty(&obd->obd_final_req_queue) ? \
1795                                   "" : "final ");
1796                 spin_unlock(&obd->obd_recovery_task_lock);
1797                 LBUG();
1798         }
1799         spin_unlock(&obd->obd_recovery_task_lock);
1800
1801         obd->obd_recovery_end = ktime_get_seconds();
1802
1803         /* When recovery finished, cleanup orphans on MDS and OST. */
1804         if (obd->obd_type && obd->obd_type->typ_dt_ops->o_postrecov) {
1805                 int rc = obd->obd_type->typ_dt_ops->o_postrecov(obd);
1806
1807                 if (rc < 0)
1808                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1809                                       obd->obd_name, rc);
1810         }
1811         EXIT;
1812 }
1813
1814 static void abort_req_replay_queue(struct obd_device *obd)
1815 {
1816         struct ptlrpc_request *req, *n;
1817         LIST_HEAD(abort_list);
1818
1819         spin_lock(&obd->obd_recovery_task_lock);
1820         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1821         spin_unlock(&obd->obd_recovery_task_lock);
1822         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1823                 DEBUG_REQ(D_WARNING, req, "aborted:");
1824                 req->rq_status = -ENOTCONN;
1825                 if (ptlrpc_error(req)) {
1826                         DEBUG_REQ(D_ERROR, req,
1827                                   "failed abort_req_reply; skipping");
1828                 }
1829                 target_exp_dequeue_req_replay(req);
1830                 target_request_copy_put(req);
1831         }
1832 }
1833
1834 static void abort_lock_replay_queue(struct obd_device *obd)
1835 {
1836         struct ptlrpc_request *req, *n;
1837         LIST_HEAD(abort_list);
1838
1839         spin_lock(&obd->obd_recovery_task_lock);
1840         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1841         spin_unlock(&obd->obd_recovery_task_lock);
1842         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1843                 DEBUG_REQ(D_ERROR, req, "aborted:");
1844                 req->rq_status = -ENOTCONN;
1845                 if (ptlrpc_error(req)) {
1846                         DEBUG_REQ(D_ERROR, req,
1847                                   "failed abort_lock_reply; skipping");
1848                 }
1849                 target_request_copy_put(req);
1850         }
1851 }
1852
1853 /*
1854  * Called from a cleanup function if the device is being cleaned up
1855  * forcefully.  The exports should all have been disconnected already,
1856  * the only thing left to do is
1857  * - clear the recovery flags
1858  * - cancel the timer
1859  * - free queued requests and replies, but don't send replies
1860  * Because the obd_stopping flag is set, no new requests should be received.
1861  */
1862 void target_cleanup_recovery(struct obd_device *obd)
1863 {
1864         struct ptlrpc_request *req, *n;
1865         LIST_HEAD(clean_list);
1866
1867         spin_lock(&obd->obd_dev_lock);
1868         if (!obd->obd_recovering) {
1869                 spin_unlock(&obd->obd_dev_lock);
1870                 EXIT;
1871                 return;
1872         }
1873         obd->obd_recovering = 0;
1874         obd->obd_abort_recovery = 0;
1875         obd->obd_abort_mdt_recovery = 0;
1876         spin_unlock(&obd->obd_dev_lock);
1877
1878         spin_lock(&obd->obd_recovery_task_lock);
1879         target_cancel_recovery_timer(obd);
1880         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1881         spin_unlock(&obd->obd_recovery_task_lock);
1882
1883         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1884                 LASSERT(req->rq_reply_state == NULL);
1885                 target_exp_dequeue_req_replay(req);
1886                 target_request_copy_put(req);
1887         }
1888
1889         spin_lock(&obd->obd_recovery_task_lock);
1890         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1891         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1892         spin_unlock(&obd->obd_recovery_task_lock);
1893
1894         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1895                 LASSERT(req->rq_reply_state == NULL);
1896                 target_request_copy_put(req);
1897         }
1898
1899         EXIT;
1900 }
1901 EXPORT_SYMBOL(target_cleanup_recovery);
1902
1903 /* obd_recovery_task_lock should be held */
1904 void target_cancel_recovery_timer(struct obd_device *obd)
1905 {
1906         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1907         hrtimer_cancel(&obd->obd_recovery_timer);
1908 }
1909
1910 static void target_start_recovery_timer(struct obd_device *obd)
1911 {
1912         ktime_t delay;
1913
1914         if (obd->obd_recovery_start != 0)
1915                 return;
1916
1917         spin_lock(&obd->obd_dev_lock);
1918         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1919                 spin_unlock(&obd->obd_dev_lock);
1920                 return;
1921         }
1922
1923         LASSERT(obd->obd_recovery_timeout != 0);
1924
1925         if (obd->obd_recovery_start != 0) {
1926                 spin_unlock(&obd->obd_dev_lock);
1927                 return;
1928         }
1929
1930         obd->obd_recovery_start = ktime_get_seconds();
1931         delay = ktime_set(obd->obd_recovery_start +
1932                           obd->obd_recovery_timeout, 0);
1933         hrtimer_start(&obd->obd_recovery_timer, delay, HRTIMER_MODE_ABS);
1934         spin_unlock(&obd->obd_dev_lock);
1935
1936         LCONSOLE_WARN("%s: Will be in recovery for at least %u:%02u, or until %d client%s reconnect%s\n",
1937                       obd->obd_name,
1938                       obd->obd_recovery_timeout / 60,
1939                       obd->obd_recovery_timeout % 60,
1940                       atomic_read(&obd->obd_max_recoverable_clients),
1941                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1942                       "" : "s",
1943                       (atomic_read(&obd->obd_max_recoverable_clients) == 1) ?
1944                       "s" : "");
1945 }
1946
1947 /**
1948  * extend recovery window.
1949  *
1950  * if @extend is true, extend recovery window to have @dr_timeout remaining
1951  * at least; otherwise, make sure the recovery timeout value is not less
1952  * than @dr_timeout.
1953  */
1954 static void extend_recovery_timer(struct obd_device *obd, timeout_t dr_timeout,
1955                                   bool extend)
1956 {
1957         ktime_t left_ns;
1958         timeout_t timeout;
1959         timeout_t left;
1960
1961         spin_lock(&obd->obd_dev_lock);
1962         if (!obd->obd_recovering || obd->obd_abort_recovery ||
1963             obd->obd_stopping) {
1964                 spin_unlock(&obd->obd_dev_lock);
1965                 return;
1966         }
1967         LASSERT(obd->obd_recovery_start != 0);
1968
1969         left_ns = hrtimer_get_remaining(&obd->obd_recovery_timer);
1970         left = ktime_divns(left_ns, NSEC_PER_SEC);
1971
1972         if (extend) {
1973                 timeout = obd->obd_recovery_timeout;
1974                 /* dr_timeout will happen after the hrtimer has expired.
1975                  * Add the excess time to the soft recovery timeout without
1976                  * exceeding the hard recovery timeout.
1977                  */
1978                 if (dr_timeout > left) {
1979                         timeout += dr_timeout - left;
1980                         timeout = min_t(timeout_t, obd->obd_recovery_time_hard,
1981                                         timeout);
1982                 }
1983         } else {
1984                 timeout = clamp_t(timeout_t, dr_timeout,
1985                                   obd->obd_recovery_timeout,
1986                                   obd->obd_recovery_time_hard);
1987         }
1988
1989         if (timeout == obd->obd_recovery_time_hard)
1990                 CWARN("%s: extended recovery timer reached hard limit: %d, extend: %d\n",
1991                       obd->obd_name, timeout, extend);
1992
1993         if (obd->obd_recovery_timeout < timeout) {
1994                 ktime_t end, now;
1995
1996                 obd->obd_recovery_timeout = timeout;
1997                 end = ktime_set(obd->obd_recovery_start + timeout, 0);
1998                 now = ktime_set(ktime_get_seconds(), 0);
1999                 left_ns = ktime_sub(end, now);
2000                 hrtimer_start(&obd->obd_recovery_timer, end, HRTIMER_MODE_ABS);
2001                 left = ktime_divns(left_ns, NSEC_PER_SEC);
2002         }
2003         spin_unlock(&obd->obd_dev_lock);
2004
2005         CDEBUG(D_HA, "%s: recovery timer will expire in %d seconds\n",
2006                 obd->obd_name, left);
2007 }
2008
2009 /* Reset the timer with each new client connection */
2010 /*
2011  * This timer is actually reconnect_timer, which is for making sure
2012  * the total recovery window is at least as big as my reconnect
2013  * attempt timing. So the initial recovery time_out will be set to
2014  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
2015  * from client is bigger than this, then the recovery time_out will
2016  * be extended to make sure the client could be reconnected, in the
2017  * process, the timeout from the new client should be ignored.
2018  */
2019 static void
2020 check_and_start_recovery_timer(struct obd_device *obd,
2021                                struct ptlrpc_request *req,
2022                                int new_client)
2023 {
2024         timeout_t service_timeout = lustre_msg_get_service_timeout(req->rq_reqmsg);
2025         struct obd_device_target *obt = obd2obt(obd);
2026
2027         if (!new_client && service_timeout)
2028                 /*
2029                  * Teach server about old server's estimates, as first guess
2030                  * at how long new requests will take.
2031                  */
2032                 obd_at_measure(obd, &req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
2033                                service_timeout);
2034
2035         target_start_recovery_timer(obd);
2036
2037         /*
2038          * Convert the service time to RPC timeout,
2039          * and reuse service_timeout to limit stack usage.
2040          */
2041         service_timeout = at_est2timeout(service_timeout);
2042
2043         if (CFS_FAIL_CHECK(OBD_FAIL_TGT_SLUGGISH_NET) &&
2044             service_timeout < at_extra)
2045                 service_timeout = at_extra;
2046
2047         /*
2048          * We expect other clients to timeout within service_timeout, then try
2049          * to reconnect, then try the failover server.  The max delay between
2050          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL.
2051          */
2052         service_timeout += 2 * INITIAL_CONNECT_TIMEOUT;
2053
2054         LASSERT(obt->obt_magic == OBT_MAGIC);
2055         service_timeout += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
2056         if (service_timeout > obd->obd_recovery_timeout && !new_client)
2057                 extend_recovery_timer(obd, service_timeout, false);
2058 }
2059
2060 /** Health checking routines */
2061 static inline int exp_connect_healthy(struct obd_export *exp)
2062 {
2063         return exp->exp_in_recovery;
2064 }
2065
2066 /** if export done req_replay or has replay in queue */
2067 static inline int exp_req_replay_healthy(struct obd_export *exp)
2068 {
2069         return (!exp->exp_req_replay_needed ||
2070                 atomic_read(&exp->exp_replay_count) > 0);
2071 }
2072
2073
2074 static inline int exp_req_replay_healthy_or_from_mdt(struct obd_export *exp)
2075 {
2076         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
2077                exp_req_replay_healthy(exp);
2078 }
2079
2080 /** if export done lock_replay or has replay in queue */
2081 static inline int exp_lock_replay_healthy(struct obd_export *exp)
2082 {
2083         return (!exp->exp_lock_replay_needed ||
2084                 atomic_read(&exp->exp_replay_count) > 0);
2085 }
2086
2087 static inline int exp_vbr_healthy(struct obd_export *exp)
2088 {
2089         return !exp->exp_vbr_failed;
2090 }
2091
2092 static inline int exp_finished(struct obd_export *exp)
2093 {
2094         return exp->exp_in_recovery && !exp->exp_lock_replay_needed;
2095 }
2096
2097 static inline int exp_finished_or_from_mdt(struct obd_export *exp)
2098 {
2099         return (exp_connect_flags(exp) & OBD_CONNECT_MDS_MDS) ||
2100                 exp_finished(exp);
2101 }
2102
2103 static int check_for_next_transno(struct lu_target *lut)
2104 {
2105         struct ptlrpc_request *req = NULL;
2106         struct obd_device *obd = lut->lut_obd;
2107         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2108         int wake_up = 0, connected, completed, queue_len;
2109         __u64 req_transno = 0;
2110         __u64 update_transno = 0;
2111         __u64 next_transno = 0;
2112
2113         ENTRY;
2114
2115         spin_lock(&obd->obd_recovery_task_lock);
2116         if (!list_empty(&obd->obd_req_replay_queue)) {
2117                 req = list_first_entry(&obd->obd_req_replay_queue,
2118                                        struct ptlrpc_request, rq_list);
2119                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
2120         }
2121
2122         if (!obd_mdt_recovery_abort(obd) && tdtd)
2123                 update_transno = distribute_txn_get_next_transno(tdtd);
2124
2125         connected = atomic_read(&obd->obd_connected_clients);
2126         completed = connected - atomic_read(&obd->obd_req_replay_clients);
2127         queue_len = obd->obd_requests_queued_for_recovery;
2128         next_transno = obd->obd_next_recovery_transno;
2129
2130         CDEBUG(D_HA,
2131                "max: %d, connected: %d, completed: %d, queue_len: %d, req_transno: %llu, next_transno: %llu\n",
2132                atomic_read(&obd->obd_max_recoverable_clients),
2133                connected, completed,
2134                queue_len, req_transno, next_transno);
2135
2136         if (obd_recovery_abort(obd)) {
2137                 CDEBUG(D_HA, "waking for aborted recovery\n");
2138                 wake_up = 1;
2139         } else if (obd->obd_recovery_expired) {
2140                 CDEBUG(D_HA, "waking for expired recovery\n");
2141                 wake_up = 1;
2142         } else if (!obd_mdt_recovery_abort(obd) && tdtd && req &&
2143                    is_req_replayed_by_update(req)) {
2144                 LASSERTF(req_transno < next_transno,
2145                          "req_transno %llu next_transno%llu\n", req_transno,
2146                          next_transno);
2147                 CDEBUG(D_HA, "waking for duplicate req (%llu)\n",
2148                        req_transno);
2149                 wake_up = 1;
2150         } else if (req_transno == next_transno ||
2151                    (update_transno != 0 && update_transno <= next_transno)) {
2152                 CDEBUG(D_HA, "waking for next (%lld)\n", next_transno);
2153                 wake_up = 1;
2154         } else if (queue_len > 0 &&
2155                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
2156                 /** handle gaps occured due to lost reply or VBR */
2157                 LASSERTF(req_transno >= next_transno,
2158                          "req_transno: %llu, next_transno: %llu\n",
2159                          req_transno, next_transno);
2160                 CDEBUG(D_HA,
2161                        "%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",
2162                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
2163                        next_transno, queue_len, completed, connected,
2164                        req_transno, update_transno, obd->obd_last_committed);
2165                 obd->obd_next_recovery_transno = req_transno;
2166                 wake_up = 1;
2167         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
2168                 CDEBUG(D_HA, "waking for completed recovery\n");
2169                 wake_up = 1;
2170         } else if (CFS_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
2171                 CDEBUG(D_HA,
2172                        "accepting transno gaps is explicitly allowed by fail_lock, waking up (%lld)\n",
2173                        next_transno);
2174                 obd->obd_next_recovery_transno = req_transno;
2175                 wake_up = 1;
2176         }
2177         spin_unlock(&obd->obd_recovery_task_lock);
2178         return wake_up;
2179 }
2180
2181 static int check_for_next_lock(struct lu_target *lut)
2182 {
2183         struct obd_device *obd = lut->lut_obd;
2184         int wake_up = 0;
2185
2186         spin_lock(&obd->obd_recovery_task_lock);
2187         if (!list_empty(&obd->obd_lock_replay_queue)) {
2188                 CDEBUG(D_HA, "waking for next lock\n");
2189                 wake_up = 1;
2190         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
2191                 CDEBUG(D_HA, "waking for completed lock replay\n");
2192                 wake_up = 1;
2193         } else if (obd->obd_abort_recovery) {
2194                 CDEBUG(D_HA, "waking for aborted recovery\n");
2195                 wake_up = 1;
2196         } else if (obd->obd_recovery_expired) {
2197                 CDEBUG(D_HA, "waking for expired recovery\n");
2198                 wake_up = 1;
2199         }
2200         spin_unlock(&obd->obd_recovery_task_lock);
2201
2202         return wake_up;
2203 }
2204
2205 static int check_update_llog(struct lu_target *lut)
2206 {
2207         struct obd_device *obd = lut->lut_obd;
2208         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2209
2210         if (obd_mdt_recovery_abort(obd)) {
2211                 CDEBUG(D_HA, "waking for aborted recovery\n");
2212                 return 1;
2213         }
2214
2215         if (atomic_read(&tdtd->tdtd_recovery_threads_count) == 0) {
2216                 CDEBUG(D_HA, "waking for completion of reading update log\n");
2217                 return 1;
2218         }
2219
2220         return 0;
2221 }
2222
2223 /**
2224  * wait for recovery events,
2225  * check its status with help of check_routine
2226  * evict dead clients via health_check
2227  */
2228 static int target_recovery_overseer(struct lu_target *lut,
2229                                     int (*check_routine)(struct lu_target *),
2230                                     int (*health_check)(struct obd_export *))
2231 {
2232         struct obd_device *obd = lut->lut_obd;
2233         struct target_distribute_txn_data *tdtd;
2234         time64_t last = 0;
2235         time64_t now;
2236 repeat:
2237         if (obd->obd_recovering && obd->obd_recovery_start == 0) {
2238                 now = ktime_get_seconds();
2239                 if (now - last > 600) {
2240                         LCONSOLE_INFO("%s: in recovery but waiting for the first client to connect\n",
2241                                       obd->obd_name);
2242                         last = now;
2243                 }
2244         }
2245         if (obd->obd_recovery_start != 0 && ktime_get_seconds() >=
2246               (obd->obd_recovery_start + obd->obd_recovery_time_hard)) {
2247                 __u64 next_update_transno = 0;
2248
2249                 /*
2250                  * Only abort the recovery if there are no update recovery
2251                  * left in the queue
2252                  */
2253                 spin_lock(&obd->obd_recovery_task_lock);
2254                 if (!obd_mdt_recovery_abort(obd) && lut->lut_tdtd) {
2255                         next_update_transno =
2256                                 distribute_txn_get_next_transno(lut->lut_tdtd);
2257
2258                         tdtd = lut->lut_tdtd;
2259                         /*
2260                          * If next_update_transno == 0, it probably because
2261                          * updatelog retrieve threads did not get any records
2262                          * yet, let's wait those threads stopped
2263                          */
2264                         if (next_update_transno == 0) {
2265                                 spin_unlock(&obd->obd_recovery_task_lock);
2266
2267                                 while (wait_event_timeout(
2268                                         tdtd->tdtd_recovery_threads_waitq,
2269                                         check_update_llog(lut),
2270                                         cfs_time_seconds(60)) == 0);
2271
2272                                 spin_lock(&obd->obd_recovery_task_lock);
2273                                 next_update_transno =
2274                                         distribute_txn_get_next_transno(tdtd);
2275                         }
2276                 }
2277
2278                 if (next_update_transno != 0 && !obd_recovery_abort(obd)) {
2279                         obd->obd_next_recovery_transno = next_update_transno;
2280                         spin_unlock(&obd->obd_recovery_task_lock);
2281                         /*
2282                          * Disconnect unfinished exports from clients, and
2283                          * keep connection from MDT to make sure the update
2284                          * recovery will still keep trying until some one
2285                          * manually abort the recovery
2286                          */
2287                         class_disconnect_stale_exports(obd,
2288                                                 exp_finished_or_from_mdt);
2289                         /* Abort all of replay & replay lock req from clients */
2290                         abort_req_replay_queue(obd);
2291                         abort_lock_replay_queue(obd);
2292                         CDEBUG(D_HA,
2293                                "%s: there are still update replay (%#llx)in the queue.\n",
2294                                obd->obd_name, next_update_transno);
2295                 } else {
2296                         obd->obd_abort_recovery = 1;
2297                         spin_unlock(&obd->obd_recovery_task_lock);
2298                         CWARN("%s recovery is aborted by hard timeout\n",
2299                               obd->obd_name);
2300                 }
2301         }
2302
2303         while (wait_event_timeout(obd->obd_next_transno_waitq,
2304                                   check_routine(lut),
2305                                   cfs_time_seconds(60)) == 0)
2306                 ; /* wait indefinitely for event, but don't trigger watchdog */
2307
2308         if (obd_recovery_abort(obd)) {
2309                 CWARN("recovery is aborted, evict exports in recovery\n");
2310                 if (lut->lut_tdtd != NULL) {
2311                         tdtd = lut->lut_tdtd;
2312                         /*
2313                          * Let's wait all of the update log recovery thread
2314                          * finished
2315                          */
2316                         wait_event_idle(
2317                                 tdtd->tdtd_recovery_threads_waitq,
2318                                 atomic_read(&tdtd->tdtd_recovery_threads_count)
2319                                 == 0);
2320                         /* Then abort the update recovery list */
2321                         dtrq_list_destroy(lut->lut_tdtd);
2322                 }
2323
2324                 /** evict exports which didn't finish recovery yet */
2325                 class_disconnect_stale_exports(obd, exp_finished);
2326                 return 1;
2327         } else if (obd->obd_recovery_expired) {
2328                 obd->obd_recovery_expired = 0;
2329
2330                 /** If some clients died being recovered, evict them */
2331                 LCONSOLE_WARN("%s: recovery is timed out, evict stale exports\n",
2332                               obd->obd_name);
2333                 /** evict cexports with no replay in queue, they are stalled */
2334                 class_disconnect_stale_exports(obd, health_check);
2335
2336                 /** continue with VBR */
2337                 spin_lock(&obd->obd_dev_lock);
2338                 obd->obd_version_recov = 1;
2339                 spin_unlock(&obd->obd_dev_lock);
2340                 /**
2341                  * reset timer, recovery will proceed with versions now,
2342                  * timeout is set just to handle reconnection delays
2343                  */
2344                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
2345                 /**
2346                  * Wait for recovery events again, after evicting bad clients
2347                  */
2348                 goto repeat;
2349         }
2350         return 0;
2351 }
2352
2353 static struct ptlrpc_request *target_next_replay_lock(struct lu_target *lut)
2354 {
2355         struct obd_device *obd = lut->lut_obd;
2356         struct ptlrpc_request *req = NULL;
2357
2358         CDEBUG(D_HA, "Waiting for lock\n");
2359         if (target_recovery_overseer(lut, check_for_next_lock,
2360                                      exp_lock_replay_healthy))
2361                 abort_lock_replay_queue(obd);
2362
2363         spin_lock(&obd->obd_recovery_task_lock);
2364         if (!list_empty(&obd->obd_lock_replay_queue)) {
2365                 req = list_first_entry(&obd->obd_lock_replay_queue,
2366                                        struct ptlrpc_request, rq_list);
2367                 list_del_init(&req->rq_list);
2368                 spin_unlock(&obd->obd_recovery_task_lock);
2369         } else {
2370                 spin_unlock(&obd->obd_recovery_task_lock);
2371                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
2372                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
2373                 /** evict exports failed VBR */
2374                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
2375         }
2376         return req;
2377 }
2378
2379 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
2380 {
2381         struct ptlrpc_request *req = NULL;
2382
2383         spin_lock(&obd->obd_recovery_task_lock);
2384         if (!list_empty(&obd->obd_final_req_queue)) {
2385                 req = list_first_entry(&obd->obd_final_req_queue,
2386                                        struct ptlrpc_request, rq_list);
2387                 list_del_init(&req->rq_list);
2388                 spin_unlock(&obd->obd_recovery_task_lock);
2389                 if (req->rq_export->exp_in_recovery) {
2390                         spin_lock(&req->rq_export->exp_lock);
2391                         req->rq_export->exp_in_recovery = 0;
2392                         spin_unlock(&req->rq_export->exp_lock);
2393                 }
2394         } else {
2395                 spin_unlock(&obd->obd_recovery_task_lock);
2396         }
2397         return req;
2398 }
2399
2400 static void handle_recovery_req(struct ptlrpc_thread *thread,
2401                                 struct ptlrpc_request *req,
2402                                 svc_handler_t handler)
2403 {
2404         ENTRY;
2405
2406         /**
2407          * export can be evicted during recovery, no need to handle replays for
2408          * it after that, discard such request silently
2409          */
2410         if (req->rq_export->exp_disconnected)
2411                 RETURN_EXIT;
2412
2413         req->rq_session.lc_thread = thread;
2414         req->rq_svc_thread = thread;
2415         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
2416
2417         /* thread context */
2418         lu_context_enter(&thread->t_env->le_ctx);
2419         (void)handler(req);
2420         lu_context_exit(&thread->t_env->le_ctx);
2421
2422         req->rq_svc_thread->t_env->le_ses = NULL;
2423
2424         /* don't reset timer for final stage */
2425         if (!exp_finished(req->rq_export)) {
2426                 timeout_t timeout = obd_timeout;
2427                 struct obd_device *obd = req->rq_export->exp_obd;
2428
2429                 /**
2430                  * Add request @timeout to the recovery time so next request from
2431                  * this client may come in recovery time
2432                  */
2433                 if (!obd_at_off(obd)) {
2434                         struct ptlrpc_service_part *svcpt;
2435                         timeout_t est_timeout;
2436
2437                         svcpt = req->rq_rqbd->rqbd_svcpt;
2438                         /*
2439                          * If the server sent early reply for this request,
2440                          * the client will recalculate the timeout according to
2441                          * current server estimate service time, so we will
2442                          * use the maxium timeout here for waiting the client
2443                          * sending the next req
2444                          */
2445                         est_timeout = obd_at_get(obd, &svcpt->scp_at_estimate);
2446                         timeout = max_t(timeout_t, at_est2timeout(est_timeout),
2447                                         lustre_msg_get_timeout(req->rq_reqmsg));
2448                         /*
2449                          * Add 2 net_latency, one for balance rq_deadline
2450                          * (see ptl_send_rpc), one for resend the req to server,
2451                          * Note: client will pack net_latency in replay req
2452                          * (see ptlrpc_replay_req)
2453                          */
2454                         timeout += 2 * lustre_msg_get_service_timeout(req->rq_reqmsg);
2455                 }
2456                 extend_recovery_timer(class_exp2obd(req->rq_export), timeout,
2457                                       true);
2458         }
2459         EXIT;
2460 }
2461
2462 /** Checking routines for recovery */
2463 static int check_for_recovery_ready(struct lu_target *lut)
2464 {
2465         struct obd_device *obd = lut->lut_obd;
2466         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
2467
2468         CDEBUG(D_HA,
2469                "connected %d stale %d max_recoverable_clients %d abort %d expired %d\n",
2470                clnts, obd->obd_stale_clients,
2471                atomic_read(&obd->obd_max_recoverable_clients),
2472                obd->obd_abort_recovery, obd->obd_recovery_expired);
2473
2474         if (!obd_recovery_abort(obd) && !obd->obd_recovery_expired) {
2475                 LASSERT(clnts <=
2476                         atomic_read(&obd->obd_max_recoverable_clients));
2477                 if (clnts + obd->obd_stale_clients <
2478                     atomic_read(&obd->obd_max_recoverable_clients))
2479                         return 0;
2480         }
2481
2482         if (!obd_mdt_recovery_abort(obd) && lut->lut_tdtd &&
2483             !lut->lut_tdtd->tdtd_replay_ready) {
2484                 /* Let's extend recovery timer, in case the recovery timer
2485                  * expired, and some clients got evicted
2486                  */
2487                 extend_recovery_timer(obd, obd->obd_recovery_timeout, true);
2488                 CDEBUG(D_HA,
2489                        "%s update recovery is not ready, extend recovery %d\n",
2490                        obd->obd_name, obd->obd_recovery_timeout);
2491                 return 0;
2492         }
2493
2494         return 1;
2495 }
2496
2497 enum {
2498         REQUEST_RECOVERY = 1,
2499         UPDATE_RECOVERY = 2,
2500 };
2501
2502 static __u64 get_next_replay_req_transno(struct obd_device *obd)
2503 {
2504         __u64 transno = 0;
2505
2506         if (!list_empty(&obd->obd_req_replay_queue)) {
2507                 struct ptlrpc_request *req;
2508
2509                 req = list_first_entry(&obd->obd_req_replay_queue,
2510                                        struct ptlrpc_request, rq_list);
2511                 transno = lustre_msg_get_transno(req->rq_reqmsg);
2512         }
2513
2514         return transno;
2515 }
2516
2517 static __u64 get_next_transno(struct lu_target *lut, int *type)
2518 {
2519         struct obd_device *obd = lut->lut_obd;
2520         struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2521         __u64 transno = 0;
2522         __u64 update_transno;
2523
2524         ENTRY;
2525
2526         transno = get_next_replay_req_transno(obd);
2527         if (type != NULL)
2528                 *type = REQUEST_RECOVERY;
2529
2530         if (!tdtd || obd_mdt_recovery_abort(obd))
2531                 RETURN(transno);
2532
2533         update_transno = distribute_txn_get_next_transno(tdtd);
2534         if (transno == 0 || (transno >= update_transno &&
2535                              update_transno != 0)) {
2536                 transno = update_transno;
2537                 if (type != NULL)
2538                         *type = UPDATE_RECOVERY;
2539         }
2540
2541         RETURN(transno);
2542 }
2543
2544 /**
2545  * drop duplicate replay request
2546  *
2547  * Because the operation has been replayed by update recovery, the request
2548  * with the same transno will be dropped and also notify the client to send
2549  * next replay request.
2550  *
2551  * \param[in] env       execution environment
2552  * \param[in] obd       failover obd device
2553  * \param[in] req       request to be dropped
2554  *
2555  * \retval true         duplicate replay update is dropped
2556  * \retval false        duplicate replay update is not dropped
2557  */
2558 static bool drop_duplicate_replay_req(struct lu_env *env,
2559                                       struct obd_device *obd,
2560                                       struct ptlrpc_request *req)
2561 {
2562         __u32 opc = lustre_msg_get_opc(req->rq_reqmsg);
2563
2564         DEBUG_REQ(D_HA, req,
2565                   "remove t%lld from %s because duplicate update records found",
2566                   lustre_msg_get_transno(req->rq_reqmsg),
2567                   libcfs_nidstr(&req->rq_peer.nid));
2568
2569         /*
2570          * Right now, only for MDS reint operation update replay and
2571          * normal request replay can have the same transno
2572          */
2573         if (opc == MDS_REINT) {
2574                 req_capsule_set(&req->rq_pill, &RQF_MDS_REINT);
2575                 req->rq_status = req_capsule_server_pack(&req->rq_pill);
2576                 if (likely(req->rq_export))
2577                         target_committed_to_req(req);
2578                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
2579                 target_send_reply(req, req->rq_status, 0);
2580         } else if (opc == MDS_CLOSE) {
2581                 DEBUG_REQ(D_HA, req, "duplicate close replay from %s\n",
2582                                 libcfs_nidstr(&req->rq_peer.nid));
2583                 return false;
2584         } else {
2585                 DEBUG_REQ(D_ERROR, req, "wrong opc %d from %s\n", opc,
2586                           libcfs_nidstr(&req->rq_peer.nid));
2587         }
2588         target_exp_dequeue_req_replay(req);
2589         target_request_copy_put(req);
2590         obd->obd_replayed_requests++;
2591
2592         return true;
2593 }
2594
2595 #define WATCHDOG_TIMEOUT (obd_timeout * 10)
2596
2597 static void replay_request_or_update(struct lu_env *env,
2598                                      struct lu_target *lut,
2599                                      struct target_recovery_data *trd,
2600                                      struct ptlrpc_thread *thread)
2601 {
2602         struct obd_device *obd = lut->lut_obd;
2603         struct ptlrpc_request *req = NULL;
2604         int type;
2605         __u64 transno;
2606
2607         ENTRY;
2608
2609         CDEBUG(D_HA, "Waiting for transno %lld\n",
2610                obd->obd_next_recovery_transno);
2611
2612         /* Replay all of request and update by transno */
2613         do {
2614                 struct target_distribute_txn_data *tdtd = lut->lut_tdtd;
2615
2616                 CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
2617
2618                 /**
2619                  * It is needed to extend recovery window above
2620                  *  recovery_time_soft. Extending is possible only in the
2621                  *  end of recovery window (see more details in
2622                  *  handle_recovery_req()).
2623                  */
2624                 CFS_FAIL_TIMEOUT_MS(OBD_FAIL_TGT_REPLAY_DELAY, 300);
2625
2626                 if (target_recovery_overseer(lut, check_for_next_transno,
2627                                         exp_req_replay_healthy_or_from_mdt)) {
2628                         abort_req_replay_queue(obd);
2629                         abort_lock_replay_queue(obd);
2630                         goto abort;
2631                 }
2632
2633                 spin_lock(&obd->obd_recovery_task_lock);
2634                 transno = get_next_transno(lut, &type);
2635                 if (type == REQUEST_RECOVERY && transno != 0) {
2636                         bool update = false;
2637                         /*
2638                          * Drop replay request from client side, if the
2639                          * replay has been executed by update with the
2640                          * same transno
2641                          */
2642                         req = list_first_entry(&obd->obd_req_replay_queue,
2643                                                struct ptlrpc_request, rq_list);
2644
2645                         list_del_init(&req->rq_list);
2646                         obd->obd_requests_queued_for_recovery--;
2647                         spin_unlock(&obd->obd_recovery_task_lock);
2648
2649                         /*
2650                          * Let's check if the request has been redone by
2651                          * update replay
2652                          */
2653                         if (is_req_replayed_by_update(req)) {
2654                                 struct distribute_txn_replay_req *dtrq;
2655
2656                                 dtrq = distribute_txn_lookup_finish_list(tdtd,
2657                                                                       transno);
2658                                 LASSERT(dtrq != NULL);
2659                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2660                                 list_del_init(&dtrq->dtrq_list);
2661                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2662                                 dtrq_destroy(dtrq);
2663
2664                                 if (drop_duplicate_replay_req(env, obd, req))
2665                                         continue;
2666                                 /* not dropped yet */
2667                                 update = true;
2668                         }
2669
2670                         LASSERT(trd->trd_processing_task == current->pid);
2671                         DEBUG_REQ(D_HA, req, "processing x%llu t%lld from %s",
2672                                   req->rq_xid,
2673                                   lustre_msg_get_transno(req->rq_reqmsg),
2674                                   libcfs_nidstr(&req->rq_peer.nid));
2675
2676                         ptlrpc_watchdog_init(&thread->t_watchdog,
2677                                              WATCHDOG_TIMEOUT);
2678                         handle_recovery_req(thread, req,
2679                                             trd->trd_recovery_handler);
2680                         ptlrpc_watchdog_disable(&thread->t_watchdog);
2681
2682                         /**
2683                          * bz18031: increase next_recovery_transno before
2684                          * target_request_copy_put() will drop exp_rpc reference
2685                          */
2686                         if (!update) {
2687                                 spin_lock(&obd->obd_recovery_task_lock);
2688                                 obd->obd_next_recovery_transno++;
2689                                 spin_unlock(&obd->obd_recovery_task_lock);
2690                         }
2691                         target_exp_dequeue_req_replay(req);
2692                         target_request_copy_put(req);
2693                         obd->obd_replayed_requests++;
2694                 } else if (type == UPDATE_RECOVERY && transno != 0) {
2695                         struct distribute_txn_replay_req *dtrq;
2696                         int rc;
2697
2698                         spin_unlock(&obd->obd_recovery_task_lock);
2699
2700                         LASSERT(tdtd != NULL);
2701                         dtrq = distribute_txn_get_next_req(tdtd);
2702                         lu_context_enter(&thread->t_env->le_ctx);
2703                         ptlrpc_watchdog_init(&thread->t_watchdog,
2704                                              WATCHDOG_TIMEOUT);
2705                         rc = tdtd->tdtd_replay_handler(env, tdtd, dtrq);
2706                         ptlrpc_watchdog_disable(&thread->t_watchdog);
2707                         lu_context_exit(&thread->t_env->le_ctx);
2708                         extend_recovery_timer(obd, obd_timeout, true);
2709
2710                         if (rc == 0 && dtrq->dtrq_xid != 0) {
2711                                 CDEBUG(D_HA,
2712                                        "Move x%llu t%llu to finish list\n",
2713                                        dtrq->dtrq_xid,
2714                                        dtrq->dtrq_master_transno);
2715
2716                                 /* Add it to the replay finish list */
2717                                 spin_lock(&tdtd->tdtd_replay_list_lock);
2718                                 list_add(&dtrq->dtrq_list,
2719                                          &tdtd->tdtd_replay_finish_list);
2720                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
2721
2722                                 spin_lock(&obd->obd_recovery_task_lock);
2723                                 if (transno == obd->obd_next_recovery_transno)
2724                                         obd->obd_next_recovery_transno++;
2725                                 else if (transno >
2726                                          obd->obd_next_recovery_transno)
2727                                         obd->obd_next_recovery_transno =
2728                                                                 transno + 1;
2729                                 spin_unlock(&obd->obd_recovery_task_lock);
2730                         } else {
2731                                 dtrq_destroy(dtrq);
2732                         }
2733                 } else {
2734                         spin_unlock(&obd->obd_recovery_task_lock);
2735 abort:
2736                         LASSERT(list_empty(&obd->obd_req_replay_queue));
2737                         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
2738                         /** evict exports failed VBR */
2739                         class_disconnect_stale_exports(obd, exp_vbr_healthy);
2740                         break;
2741                 }
2742         } while (1);
2743 }
2744
2745 static int target_recovery_thread(void *arg)
2746 {
2747         struct lu_target *lut = arg;
2748         struct obd_device *obd = lut->lut_obd;
2749         struct ptlrpc_request *req;
2750         struct target_recovery_data *trd = &obd->obd_recovery_data;
2751         unsigned long delta;
2752         struct lu_env *env;
2753         struct ptlrpc_thread *thread = NULL;
2754         int rc = 0;
2755
2756         ENTRY;
2757         unshare_fs_struct();
2758         OBD_ALLOC_PTR(thread);
2759         if (thread == NULL)
2760                 RETURN(-ENOMEM);
2761
2762         OBD_ALLOC_PTR(env);
2763         if (env == NULL)
2764                 GOTO(out_thread, rc = -ENOMEM);
2765         rc = lu_env_add(env);
2766         if (rc)
2767                 GOTO(out_env, rc);
2768
2769         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
2770         if (rc)
2771                 GOTO(out_env_remove, rc);
2772
2773         thread->t_env = env;
2774         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
2775         thread->t_task = current;
2776         env->le_ctx.lc_thread = thread;
2777         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
2778
2779         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
2780                current->pid);
2781         trd->trd_processing_task = current->pid;
2782
2783         spin_lock(&obd->obd_dev_lock);
2784         obd->obd_recovering = 1;
2785         spin_unlock(&obd->obd_dev_lock);
2786         complete(&trd->trd_starting);
2787
2788         /* first of all, we have to know the first transno to replay */
2789         if (target_recovery_overseer(lut, check_for_recovery_ready,
2790                                      exp_connect_healthy)) {
2791                 abort_req_replay_queue(obd);
2792                 abort_lock_replay_queue(obd);
2793                 if (lut->lut_tdtd != NULL)
2794                         dtrq_list_destroy(lut->lut_tdtd);
2795         }
2796
2797         /* next stage: replay requests or update */
2798         delta = jiffies;
2799         CDEBUG(D_INFO, "1: request replay stage - %d clients from t%llu\n",
2800                atomic_read(&obd->obd_req_replay_clients),
2801                obd->obd_next_recovery_transno);
2802         replay_request_or_update(env, lut, trd, thread);
2803
2804         /**
2805          * The second stage: replay locks
2806          */
2807         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2808                atomic_read(&obd->obd_lock_replay_clients));
2809         while ((req = target_next_replay_lock(lut))) {
2810                 LASSERT(trd->trd_processing_task == current->pid);
2811                 DEBUG_REQ(D_HA, req, "processing lock from %s:",
2812                           libcfs_nidstr(&req->rq_peer.nid));
2813                 if (CFS_FAIL_CHECK(OBD_FAIL_LDLM_LOCK_REPLAY)) {
2814                         req->rq_status = -ENODEV;
2815                         target_request_copy_put(req);
2816                         continue;
2817                 }
2818                 handle_recovery_req(thread, req,
2819                                     trd->trd_recovery_handler);
2820                 target_request_copy_put(req);
2821                 obd->obd_replayed_locks++;
2822         }
2823
2824         /**
2825          * The third stage: reply on final pings, at this moment all clients
2826          * must have request in final queue
2827          */
2828         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_RECONNECT, cfs_fail_val);
2829         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2830         /** Update server last boot epoch */
2831         tgt_boot_epoch_update(lut);
2832
2833         /* cancel update llogs upon recovery abort */
2834         if (obd->obd_abort_recovery || obd->obd_abort_mdt_recovery)
2835                 obd->obd_type->typ_dt_ops->o_iocontrol(OBD_IOC_LLOG_CANCEL,
2836                                                        obd->obd_self_export,
2837                                                        0, trd, NULL);
2838
2839         list_for_each_entry(req, &obd->obd_final_req_queue, rq_list) {
2840                 /*
2841                  * Because the waiting client can not send ping to server,
2842                  * so we need refresh the last_request_time, to avoid the
2843                  * export is being evicted
2844                  */
2845                 ptlrpc_update_export_timer(req->rq_export, 0);
2846         }
2847
2848         /*
2849          * We drop recoverying flag to forward all new requests
2850          * to regular mds_handle() since now
2851          */
2852         spin_lock(&obd->obd_dev_lock);
2853         obd->obd_recovering = 0;
2854         obd->obd_abort_recovery = 0;
2855         obd->obd_abort_mdt_recovery = 0;
2856         spin_unlock(&obd->obd_dev_lock);
2857         spin_lock(&obd->obd_recovery_task_lock);
2858         target_cancel_recovery_timer(obd);
2859         spin_unlock(&obd->obd_recovery_task_lock);
2860         while ((req = target_next_final_ping(obd))) {
2861                 LASSERT(trd->trd_processing_task == current->pid);
2862                 DEBUG_REQ(D_HA, req, "processing final ping from %s:",
2863                           libcfs_nidstr(&req->rq_peer.nid));
2864                 handle_recovery_req(thread, req,
2865                                     trd->trd_recovery_handler);
2866                 target_request_copy_put(req);
2867         }
2868
2869         delta = jiffies_to_msecs(jiffies - delta) / MSEC_PER_SEC;
2870         CDEBUG(D_INFO, "4: recovery completed in %lus - %d/%d reqs/locks\n",
2871                delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2872         if (delta > OBD_RECOVERY_TIME_SOFT) {
2873                 CWARN("too long recovery - read logs\n");
2874                 libcfs_debug_dumplog();
2875         }
2876
2877         target_finish_recovery(lut);
2878         lu_context_fini(&env->le_ctx);
2879         trd->trd_processing_task = 0;
2880         complete_all(&trd->trd_finishing);
2881         tgt_io_thread_done(thread);
2882 out_env_remove:
2883         lu_env_remove(env);
2884 out_env:
2885         OBD_FREE_PTR(env);
2886 out_thread:
2887         OBD_FREE_PTR(thread);
2888         RETURN(rc);
2889 }
2890
2891 static int target_start_recovery_thread(struct lu_target *lut,
2892                                         svc_handler_t handler)
2893 {
2894         struct obd_device *obd = lut->lut_obd;
2895         int rc = 0;
2896         struct target_recovery_data *trd = &obd->obd_recovery_data;
2897         int index;
2898
2899         memset(trd, 0, sizeof(*trd));
2900         init_completion(&trd->trd_starting);
2901         init_completion(&trd->trd_finishing);
2902         trd->trd_recovery_handler = handler;
2903
2904         rc = server_name2index(obd->obd_name, &index, NULL);
2905         if (rc < 0)
2906                 return rc;
2907
2908         if (!IS_ERR(kthread_run(target_recovery_thread,
2909                                 lut, "tgt_recover_%d", index))) {
2910                 wait_for_completion(&trd->trd_starting);
2911                 LASSERT(obd->obd_recovering != 0);
2912         } else {
2913                 rc = -ECHILD;
2914         }
2915
2916         return rc;
2917 }
2918
2919 void target_stop_recovery_thread(struct obd_device *obd)
2920 {
2921         if (obd->obd_recovery_data.trd_processing_task > 0) {
2922                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2923                 /** recovery can be done but postrecovery is not yet */
2924                 spin_lock(&obd->obd_dev_lock);
2925                 if (obd->obd_recovering) {
2926                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2927                         obd->obd_abort_recovery = 1;
2928                         wake_up(&obd->obd_next_transno_waitq);
2929                 }
2930                 spin_unlock(&obd->obd_dev_lock);
2931                 wait_for_completion(&trd->trd_finishing);
2932         }
2933 }
2934 EXPORT_SYMBOL(target_stop_recovery_thread);
2935
2936 void target_recovery_fini(struct obd_device *obd)
2937 {
2938         class_disconnect_exports(obd);
2939         target_stop_recovery_thread(obd);
2940         target_cleanup_recovery(obd);
2941 }
2942 EXPORT_SYMBOL(target_recovery_fini);
2943
2944 static enum hrtimer_restart target_recovery_expired(struct hrtimer *timer)
2945 {
2946         struct obd_device *obd = container_of(timer, struct obd_device,
2947                                               obd_recovery_timer);
2948
2949         CDEBUG(D_HA,
2950                "%s: recovery timed out; %d clients are still in recovery after %llu seconds (%d clients connected)\n",
2951                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2952                ktime_get_seconds() - obd->obd_recovery_start,
2953                atomic_read(&obd->obd_connected_clients));
2954
2955         obd->obd_recovery_expired = 1;
2956         wake_up(&obd->obd_next_transno_waitq);
2957         return HRTIMER_NORESTART;
2958 }
2959
2960 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2961 {
2962         struct obd_device *obd = lut->lut_obd;
2963
2964         if (lut->lut_bottom->dd_rdonly)
2965                 return;
2966
2967         if (atomic_read(&obd->obd_max_recoverable_clients) == 0) {
2968                 /** Update server last boot epoch */
2969                 tgt_boot_epoch_update(lut);
2970                 return;
2971         }
2972
2973         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2974                "last_transno %llu\n", obd->obd_name,
2975                atomic_read(&obd->obd_max_recoverable_clients),
2976                obd->obd_last_committed);
2977         LASSERT(obd->obd_stopping == 0);
2978         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2979         obd->obd_recovery_start = 0;
2980         obd->obd_recovery_end = 0;
2981
2982         hrtimer_init(&obd->obd_recovery_timer, CLOCK_MONOTONIC,
2983                      HRTIMER_MODE_ABS);
2984         obd->obd_recovery_timer.function = &target_recovery_expired;
2985         target_start_recovery_thread(lut, handler);
2986 }
2987 EXPORT_SYMBOL(target_recovery_init);
2988
2989 static int target_process_req_flags(struct obd_device *obd,
2990                                     struct ptlrpc_request *req)
2991 {
2992         struct obd_export *exp = req->rq_export;
2993
2994         LASSERT(exp != NULL);
2995         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2996                 /* client declares he's ready to replay locks */
2997                 spin_lock(&exp->exp_lock);
2998                 if (exp->exp_req_replay_needed) {
2999                         exp->exp_req_replay_needed = 0;
3000                         spin_unlock(&exp->exp_lock);
3001
3002                         LASSERT(atomic_read(&(obd)->obd_req_replay_clients) >
3003                                 0);
3004                         atomic_dec(&obd->obd_req_replay_clients);
3005                 } else {
3006                         spin_unlock(&exp->exp_lock);
3007                 }
3008         }
3009         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
3010                 /*
3011                  * client declares he's ready to complete recovery
3012                  * so, we put the request on th final queue
3013                  */
3014                 spin_lock(&exp->exp_lock);
3015                 if (exp->exp_lock_replay_needed) {
3016                         exp->exp_lock_replay_needed = 0;
3017                         spin_unlock(&exp->exp_lock);
3018
3019                         LASSERT(atomic_read(&(obd)->obd_lock_replay_clients) >
3020                                 0);
3021                         atomic_dec(&obd->obd_lock_replay_clients);
3022                 } else {
3023                         spin_unlock(&exp->exp_lock);
3024                 }
3025         }
3026         return 0;
3027 }
3028
3029 int target_queue_recovery_request(struct ptlrpc_request *req,
3030                                   struct obd_device *obd)
3031 {
3032         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
3033         struct ptlrpc_request *reqiter;
3034         int inserted = 0;
3035
3036         ENTRY;
3037
3038         if (obd->obd_recovery_data.trd_processing_task == current->pid) {
3039                 /* Processing the queue right now, don't re-add. */
3040                 RETURN(1);
3041         }
3042
3043         target_process_req_flags(obd, req);
3044
3045         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
3046                 if (unlikely(CFS_FAIL_CHECK(OBD_FAIL_TGT_RECOVERY_REQ_RACE))) {
3047                         if (cfs_fail_val == 1) {
3048                                 cfs_race_state = 1;
3049                                 cfs_fail_val = 0;
3050                                 wake_up(&cfs_race_waitq);
3051
3052                                 schedule_timeout_interruptible(
3053                                         cfs_time_seconds(1));
3054                         }
3055                 }
3056
3057                 /*
3058                  * client declares he's ready to complete recovery
3059                  * so, we put the request on th final queue
3060                  */
3061                 target_request_copy_get(req);
3062                 DEBUG_REQ(D_HA, req, "queue final req");
3063                 wake_up(&obd->obd_next_transno_waitq);
3064                 spin_lock(&obd->obd_recovery_task_lock);
3065                 if (obd->obd_recovering) {
3066                         struct ptlrpc_request *tmp;
3067                         struct ptlrpc_request *duplicate = NULL;
3068
3069                         if (likely(!req->rq_export->exp_replay_done)) {
3070                                 req->rq_export->exp_replay_done = 1;
3071                                 list_add_tail(&req->rq_list,
3072                                               &obd->obd_final_req_queue);
3073                                 spin_unlock(&obd->obd_recovery_task_lock);
3074                                 RETURN(0);
3075                         }
3076
3077                         /*
3078                          * XXX O(n), but only happens if final ping is
3079                          * timed out, probably reorganize the list as
3080                          * a hash list later
3081                          */
3082                         list_for_each_entry_safe(reqiter, tmp,
3083                                                  &obd->obd_final_req_queue,
3084                                                  rq_list) {
3085                                 if (reqiter->rq_export == req->rq_export) {
3086                                         list_del_init(&reqiter->rq_list);
3087                                         duplicate = reqiter;
3088                                         break;
3089                                 }
3090                         }
3091
3092                         list_add_tail(&req->rq_list,
3093                                       &obd->obd_final_req_queue);
3094                         req->rq_export->exp_replay_done = 1;
3095                         spin_unlock(&obd->obd_recovery_task_lock);
3096
3097                         if (duplicate != NULL) {
3098                                 DEBUG_REQ(D_HA, duplicate,
3099                                           "put prev final req");
3100                                 target_request_copy_put(duplicate);
3101                         }
3102                         RETURN(0);
3103                 } else {
3104                         spin_unlock(&obd->obd_recovery_task_lock);
3105                         target_request_copy_put(req);
3106                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
3107                 }
3108         }
3109         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
3110                 /* client declares he's ready to replay locks */
3111                 target_request_copy_get(req);
3112                 DEBUG_REQ(D_HA, req, "queue lock replay req");
3113                 wake_up(&obd->obd_next_transno_waitq);
3114                 spin_lock(&obd->obd_recovery_task_lock);
3115                 LASSERT(obd->obd_recovering);
3116                 /* usually due to recovery abort */
3117                 if (!req->rq_export->exp_in_recovery) {
3118                         spin_unlock(&obd->obd_recovery_task_lock);
3119                         target_request_copy_put(req);
3120                         RETURN(-ENOTCONN);
3121                 }
3122                 LASSERT(req->rq_export->exp_lock_replay_needed);
3123                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
3124                 spin_unlock(&obd->obd_recovery_task_lock);
3125                 RETURN(0);
3126         }
3127
3128         /*
3129          * CAVEAT EMPTOR: The incoming request message has been swabbed
3130          * (i.e. buflens etc are in my own byte order), but type-dependent
3131          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed.
3132          */
3133
3134         if (!transno) {
3135                 INIT_LIST_HEAD(&req->rq_list);
3136                 DEBUG_REQ(D_HA, req, "not queueing");
3137                 RETURN(1);
3138         }
3139
3140         /*
3141          * If we're processing the queue, we want don't want to queue this
3142          * message.
3143          *
3144          * Also, if this request has a transno less than the one we're waiting
3145          * for, we should process it now.  It could (and currently always will)
3146          * be an open request for a descriptor that was opened some time ago.
3147          *
3148          * Also, a resent, replayed request that has already been
3149          * handled will pass through here and be processed immediately.
3150          */
3151         CDEBUG(D_HA,
3152                "Next recovery transno: %llu, current: %llu, replaying\n",
3153                obd->obd_next_recovery_transno, transno);
3154
3155         /*
3156          * If the request has been replayed by update replay, then sends this
3157          * request to the recovery thread (replay_request_or_update()), where
3158          * it will be handled
3159          */
3160         spin_lock(&obd->obd_recovery_task_lock);
3161         if (transno < obd->obd_next_recovery_transno &&
3162             !is_req_replayed_by_update(req)) {
3163                 /* Processing the queue right now, don't re-add. */
3164                 LASSERT(list_empty(&req->rq_list));
3165                 spin_unlock(&obd->obd_recovery_task_lock);
3166                 RETURN(1);
3167         }
3168         spin_unlock(&obd->obd_recovery_task_lock);
3169
3170         if (CFS_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
3171                 RETURN(0);
3172
3173         target_request_copy_get(req);
3174         if (!req->rq_export->exp_in_recovery) {
3175                 target_request_copy_put(req);
3176                 RETURN(-ENOTCONN);
3177         }
3178         LASSERT(req->rq_export->exp_req_replay_needed);
3179
3180         if (target_exp_enqueue_req_replay(req)) {
3181                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
3182                 target_request_copy_put(req);
3183                 RETURN(0);
3184         }
3185
3186         /* XXX O(n^2) */
3187         spin_lock(&obd->obd_recovery_task_lock);
3188         LASSERT(obd->obd_recovering);
3189         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
3190                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
3191                         list_add_tail(&req->rq_list, &reqiter->rq_list);
3192                         inserted = 1;
3193                         goto added;
3194                 }
3195
3196                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
3197                              transno)) {
3198                         DEBUG_REQ(D_ERROR, req,
3199                                   "dropping replay: transno has been claimed by another client");
3200                         spin_unlock(&obd->obd_recovery_task_lock);
3201                         target_exp_dequeue_req_replay(req);
3202                         target_request_copy_put(req);
3203                         RETURN(0);
3204                 }
3205         }
3206 added:
3207         if (!inserted)
3208                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
3209
3210         obd->obd_requests_queued_for_recovery++;
3211         spin_unlock(&obd->obd_recovery_task_lock);
3212         wake_up(&obd->obd_next_transno_waitq);
3213         RETURN(0);
3214 }
3215
3216 void target_committed_to_req(struct ptlrpc_request *req)
3217 {
3218         struct obd_export *exp = req->rq_export;
3219
3220         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
3221                 lustre_msg_set_last_committed(req->rq_repmsg,
3222                                               exp->exp_last_committed);
3223         else
3224                 DEBUG_REQ(D_IOCTL, req,
3225                           "not sending last_committed update (%d/%d)",
3226                           exp->exp_obd->obd_no_transno,
3227                           req->rq_repmsg == NULL);
3228
3229         CDEBUG(D_INFO, "last_committed %llu, transno %llu, xid %llu\n",
3230                exp->exp_last_committed, req->rq_transno, req->rq_xid);
3231 }
3232
3233 #endif /* HAVE_SERVER_SUPPORT */
3234
3235 /**
3236  * Packs current SLV and Limit into \a req.
3237  */
3238 int target_pack_pool_reply(struct ptlrpc_request *req)
3239 {
3240         struct obd_device *obd;
3241
3242         ENTRY;
3243
3244         /*
3245          * Check that we still have all structures alive as this may
3246          * be some late RPC at shutdown time.
3247          */
3248         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
3249                      !exp_connect_lru_resize(req->rq_export))) {
3250                 lustre_msg_set_slv(req->rq_repmsg, 0);
3251                 lustre_msg_set_limit(req->rq_repmsg, 0);
3252                 RETURN(0);
3253         }
3254
3255         /* OBD is alive here as export is alive, which we checked above. */
3256         obd = req->rq_export->exp_obd;
3257
3258         read_lock(&obd->obd_pool_lock);
3259         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
3260         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
3261         read_unlock(&obd->obd_pool_lock);
3262
3263         RETURN(0);
3264 }
3265
3266 static int target_send_reply_msg(struct ptlrpc_request *req,
3267                                  int rc, int fail_id)
3268 {
3269         if (CFS_FAIL_CHECK_ORSET(fail_id & ~CFS_FAIL_ONCE, CFS_FAIL_ONCE)) {
3270                 DEBUG_REQ(D_ERROR, req, "dropping reply");
3271                 return -ECOMM;
3272         }
3273         /*
3274          * We can have a null rq_reqmsg in the event of bad signature or
3275          * no context when unwrapping
3276          */
3277         if (req->rq_reqmsg &&
3278             unlikely(lustre_msg_get_opc(req->rq_reqmsg) == MDS_REINT &&
3279             CFS_FAIL_CHECK(OBD_FAIL_MDS_REINT_MULTI_NET_REP)))
3280                 return -ECOMM;
3281
3282         if (unlikely(rc)) {
3283                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
3284                 req->rq_status = rc;
3285                 return ptlrpc_send_error(req, 1);
3286         }
3287         DEBUG_REQ(D_NET, req, "sending reply");
3288
3289         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
3290 }
3291
3292 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
3293 {
3294         struct ptlrpc_service_part *svcpt;
3295         int netrc;
3296         struct ptlrpc_reply_state *rs;
3297         struct obd_export *exp;
3298
3299         ENTRY;
3300
3301         if (req->rq_no_reply) {
3302                 EXIT;
3303                 return;
3304         }
3305
3306         svcpt = req->rq_rqbd->rqbd_svcpt;
3307         rs = req->rq_reply_state;
3308         if (rs == NULL || !rs->rs_difficult) {
3309                 /* no notifiers */
3310                 target_send_reply_msg(req, rc, fail_id);
3311                 EXIT;
3312                 return;
3313         }
3314
3315         /* must be an export if locks saved */
3316         LASSERT(req->rq_export != NULL);
3317         /* req/reply consistent */
3318         LASSERT(rs->rs_svcpt == svcpt);
3319
3320         /* "fresh" reply */
3321         LASSERT(!rs->rs_scheduled);
3322         LASSERT(!rs->rs_scheduled_ever);
3323         LASSERT(!rs->rs_handled);
3324         LASSERT(!rs->rs_sent);
3325         LASSERT(!rs->rs_unlinked);
3326         LASSERT(rs->rs_export == NULL);
3327         LASSERT(list_empty(&rs->rs_obd_list));
3328         LASSERT(list_empty(&rs->rs_exp_list));
3329
3330         exp = class_export_get(req->rq_export);
3331
3332         /* disable reply scheduling while I'm setting up */
3333         rs->rs_scheduled = 1;
3334         rs->rs_sent      = 0;
3335         rs->rs_unlinked  = 0;
3336         rs->rs_xid       = req->rq_xid;
3337         rs->rs_transno   = req->rq_transno;
3338         rs->rs_export    = exp;
3339         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
3340
3341         spin_lock(&exp->exp_uncommitted_replies_lock);
3342         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
3343                rs->rs_transno, exp->exp_last_committed);
3344         if (rs->rs_transno > exp->exp_last_committed) {
3345                 /* not committed already */
3346                 list_add_tail(&rs->rs_obd_list,
3347                                   &exp->exp_uncommitted_replies);
3348         }
3349         spin_unlock(&exp->exp_uncommitted_replies_lock);
3350
3351         spin_lock(&exp->exp_lock);
3352         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
3353         spin_unlock(&exp->exp_lock);
3354
3355         netrc = target_send_reply_msg(req, rc, fail_id);
3356
3357         spin_lock(&svcpt->scp_rep_lock);
3358
3359         atomic_inc(&svcpt->scp_nreps_difficult);
3360
3361         if (netrc != 0) {
3362                 /*
3363                  * error sending: reply is off the net.  Also we need +1
3364                  * reply ref until ptlrpc_handle_rs() is done
3365                  * with the reply state (if the send was successful, there
3366                  * would have been +1 ref for the net, which
3367                  * reply_out_callback leaves alone)
3368                  */
3369                 rs->rs_sent = 1;
3370                 rs->rs_unlinked = 1;
3371                 ptlrpc_rs_addref(rs);
3372         }
3373
3374         spin_lock(&rs->rs_lock);
3375         if (rs->rs_transno <= exp->exp_last_committed ||
3376             (rs->rs_unlinked && !rs->rs_no_ack) ||
3377             list_empty(&rs->rs_exp_list) ||     /* completed already */
3378             list_empty(&rs->rs_obd_list)) {
3379                 CDEBUG(D_HA, "Schedule reply immediately\n");
3380                 ptlrpc_dispatch_difficult_reply(rs);
3381         } else {
3382                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
3383                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
3384         }
3385         spin_unlock(&rs->rs_lock);
3386         spin_unlock(&svcpt->scp_rep_lock);
3387         EXIT;
3388 }
3389
3390 enum ldlm_mode lck_compat_array[] = {
3391         [LCK_EX]    = LCK_COMPAT_EX,
3392         [LCK_PW]    = LCK_COMPAT_PW,
3393         [LCK_PR]    = LCK_COMPAT_PR,
3394         [LCK_CW]    = LCK_COMPAT_CW,
3395         [LCK_CR]    = LCK_COMPAT_CR,
3396         [LCK_NL]    = LCK_COMPAT_NL,
3397         [LCK_GROUP] = LCK_COMPAT_GROUP,
3398         [LCK_COS]   = LCK_COMPAT_COS,
3399         [LCK_TXN]   = LCK_COMPAT_TXN,
3400 };
3401
3402 /**
3403  * Rather arbitrary mapping from LDLM error codes to errno values. This should
3404  * not escape to the user level.
3405  */
3406 int ldlm_error2errno(enum ldlm_error error)
3407 {
3408         int result;
3409
3410         switch (error) {
3411         case ELDLM_OK:
3412         case ELDLM_LOCK_MATCHED:
3413                 result = 0;
3414                 break;
3415         case ELDLM_LOCK_CHANGED:
3416                 result = -ESTALE;
3417                 break;
3418         case ELDLM_LOCK_ABORTED:
3419                 result = -ENAVAIL;
3420                 break;
3421         case ELDLM_LOCK_REPLACED:
3422                 result = -ESRCH;
3423                 break;
3424         case ELDLM_NO_LOCK_DATA:
3425                 result = -ENOENT;
3426                 break;
3427         case ELDLM_NAMESPACE_EXISTS:
3428                 result = -EEXIST;
3429                 break;
3430         case ELDLM_BAD_NAMESPACE:
3431                 result = -EBADF;
3432                 break;
3433         default:
3434                 if (((int)error) < 0) { /* cast to signed type */
3435                         result = error; /* as ldlm_error can be unsigned */
3436                 } else {
3437                         CERROR("Invalid DLM result code: %d\n", error);
3438                         result = -EPROTO;
3439                 }
3440         }
3441         return result;
3442 }
3443 EXPORT_SYMBOL(ldlm_error2errno);
3444
3445 /**
3446  * Dual to ldlm_error2errno(): maps errno values back to enum ldlm_error.
3447  */
3448 enum ldlm_error ldlm_errno2error(int err_no)
3449 {
3450         int error;
3451
3452         switch (err_no) {
3453         case 0:
3454                 error = ELDLM_OK;
3455                 break;
3456         case -ESTALE:
3457                 error = ELDLM_LOCK_CHANGED;
3458                 break;
3459         case -ENAVAIL:
3460                 error = ELDLM_LOCK_ABORTED;
3461                 break;
3462         case -ESRCH:
3463                 error = ELDLM_LOCK_REPLACED;
3464                 break;
3465         case -ENOENT:
3466                 error = ELDLM_NO_LOCK_DATA;
3467                 break;
3468         case -EEXIST:
3469                 error = ELDLM_NAMESPACE_EXISTS;
3470                 break;
3471         case -EBADF:
3472                 error = ELDLM_BAD_NAMESPACE;
3473                 break;
3474         default:
3475                 error = err_no;
3476         }
3477         return error;
3478 }
3479
3480 #if LUSTRE_TRACKS_LOCK_EXP_REFS
3481 void ldlm_dump_export_locks(struct obd_export *exp)
3482 {
3483         spin_lock(&exp->exp_locks_list_guard);
3484         if (!list_empty(&exp->exp_locks_list)) {
3485                 struct ldlm_lock *lock;
3486
3487                 CERROR("dumping locks for export %p, ignore if the unmount doesn't hang\n",
3488                        exp);
3489                 list_for_each_entry(lock, &exp->exp_locks_list,
3490                                         l_exp_refs_link)
3491                         LDLM_ERROR(lock, "lock:");
3492         }
3493         spin_unlock(&exp->exp_locks_list_guard);
3494 }
3495 #endif
3496
3497 #ifdef HAVE_SERVER_SUPPORT
3498 static inline const char *bulk2type(struct ptlrpc_request *req)
3499 {
3500         if (req->rq_bulk_read)
3501                 return "READ";
3502         if (req->rq_bulk_write)
3503                 return "WRITE";
3504         return "UNKNOWN";
3505 }
3506
3507 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc)
3508 {
3509         struct ptlrpc_request *req = desc->bd_req;
3510         time64_t start = ktime_get_seconds();
3511         time64_t deadline;
3512         int rc = 0;
3513
3514         ENTRY;
3515
3516         /* Check if client was evicted or reconnected already. */
3517         if (exp->exp_failed ||
3518             exp->exp_conn_cnt > lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3519                 rc = -ENOTCONN;
3520         } else {
3521                 if (req->rq_bulk_read)
3522                         rc = sptlrpc_svc_wrap_bulk(req, desc);
3523
3524                 if (OCD_HAS_FLAG(&exp->exp_connect_data, BULK_MBITS))
3525                         req->rq_mbits = lustre_msg_get_mbits(req->rq_reqmsg);
3526                 else /* old version, bulk matchbits is rq_xid */
3527                         req->rq_mbits = req->rq_xid;
3528
3529                 if (rc == 0)
3530                         rc = ptlrpc_start_bulk_transfer(desc);
3531         }
3532
3533         if (rc < 0) {
3534                 DEBUG_REQ(D_ERROR, req, "bulk %s failed: rc = %d",
3535                           bulk2type(req), rc);
3536                 RETURN(rc);
3537         }
3538
3539         if (CFS_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
3540                 ptlrpc_abort_bulk(desc);
3541                 RETURN(0);
3542         }
3543
3544         /* limit actual bulk transfer to bulk_timeout seconds */
3545         deadline = start + bulk_timeout;
3546         if (deadline > req->rq_deadline)
3547                 deadline = req->rq_deadline;
3548
3549         do {
3550                 time64_t timeoutl = deadline - ktime_get_seconds();
3551                 time64_t rq_deadline;
3552
3553                 while (timeoutl >= 0 &&
3554                        wait_event_idle_timeout(
3555                                desc->bd_waitq,
3556                                !ptlrpc_server_bulk_active(desc) ||
3557                                exp->exp_failed ||
3558                                exp->exp_conn_cnt >
3559                                lustre_msg_get_conn_cnt(req->rq_reqmsg),
3560                                timeoutl ? cfs_time_seconds(1) : 1) == 0)
3561                         timeoutl -= 1;
3562                 rc = timeoutl < 0 ? -ETIMEDOUT : 0;
3563
3564                 /* Wait again if we changed rq_deadline. */
3565                 rq_deadline = READ_ONCE(req->rq_deadline);
3566                 deadline = start + bulk_timeout;
3567                 if (deadline > rq_deadline)
3568                         deadline = rq_deadline;
3569         } while (rc == -ETIMEDOUT &&
3570                  deadline > ktime_get_seconds());
3571
3572         if (rc == -ETIMEDOUT) {
3573                 DEBUG_REQ(D_ERROR, req, "timeout on bulk %s after %lld%+llds",
3574                           bulk2type(req), deadline - start,
3575                           ktime_get_real_seconds() - deadline);
3576                 ptlrpc_abort_bulk(desc);
3577         } else if (exp->exp_failed) {
3578                 DEBUG_REQ(D_ERROR, req, "Eviction on bulk %s",
3579                           bulk2type(req));
3580                 rc = -ENOTCONN;
3581                 ptlrpc_abort_bulk(desc);
3582         } else if (exp->exp_conn_cnt >
3583                    lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
3584                 DEBUG_REQ(D_ERROR, req, "Reconnect on bulk %s",
3585                           bulk2type(req));
3586                 /* We don't reply anyway. */
3587                 rc = -ETIMEDOUT;
3588                 ptlrpc_abort_bulk(desc);
3589         } else if (desc->bd_failure) {
3590                 DEBUG_REQ(D_ERROR, req, "network error on bulk %s",
3591                           bulk2type(req));
3592                 /* XXX should this be a different errno? */
3593                 rc = -ETIMEDOUT;
3594         } else {
3595                 if (req->rq_bulk_write)
3596                         rc = sptlrpc_svc_unwrap_bulk(req, desc);
3597                 if (rc == 0 && desc->bd_nob_transferred != desc->bd_nob) {
3598                         DEBUG_REQ(D_ERROR, req, "truncated bulk %s %d(%d)",
3599                                   bulk2type(req), desc->bd_nob_transferred,
3600                                   desc->bd_nob);
3601                         /* XXX should this be a different errno? */
3602                         rc = -ETIMEDOUT;
3603                 }
3604         }
3605
3606         RETURN(rc);
3607 }
3608 EXPORT_SYMBOL(target_bulk_io);
3609
3610 #endif /* HAVE_SERVER_SUPPORT */