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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2010, 2013, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 /**
  38  * This file deals with various client/target related logic including recovery.
  39  *
  40  * TODO: This code more logically belongs in the ptlrpc module than in ldlm and
  41  * should be moved.
  42  */
  43
  44 #define DEBUG_SUBSYSTEM S_LDLM
  45
  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 "ldlm_internal.h"
  53
  54 /* @priority: If non-zero, move the selected connection to the list head.
  55  * @create: If zero, only search in existing connections.
  56  */
  57 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  58                            int priority, int create)
  59 {
  60         struct ptlrpc_connection *ptlrpc_conn;
  61         struct obd_import_conn *imp_conn = NULL, *item;
  62         int rc = 0;
  63         ENTRY;
  64
  65         if (!create && !priority) {
  66                 CDEBUG(D_HA, "Nothing to do\n");
  67                 RETURN(-EINVAL);
  68         }
  69
  70         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
  71         if (!ptlrpc_conn) {
  72                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  73                 RETURN (-ENOENT);
  74         }
  75
  76         if (create) {
  77                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  78                 if (!imp_conn) {
  79                         GOTO(out_put, rc = -ENOMEM);
  80                 }
  81         }
  82
  83         spin_lock(&imp->imp_lock);
  84         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  85                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  86                         if (priority) {
  87                                 list_del(&item->oic_item);
  88                                 list_add(&item->oic_item,
  89                                              &imp->imp_conn_list);
  90                                 item->oic_last_attempt = 0;
  91                         }
  92                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  93                                imp, imp->imp_obd->obd_name, uuid->uuid,
  94                                (priority ? ", moved to head" : ""));
  95                         spin_unlock(&imp->imp_lock);
  96                         GOTO(out_free, rc = 0);
  97                 }
  98         }
  99         /* No existing import connection found for \a uuid. */
 100         if (create) {
 101                 imp_conn->oic_conn = ptlrpc_conn;
 102                 imp_conn->oic_uuid = *uuid;
 103                 imp_conn->oic_last_attempt = 0;
 104                 if (priority)
 105                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 106                 else
 107                         list_add_tail(&imp_conn->oic_item,
 108                                           &imp->imp_conn_list);
 109                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 110                        imp, imp->imp_obd->obd_name, uuid->uuid,
 111                        (priority ? "head" : "tail"));
 112         } else {
 113                 spin_unlock(&imp->imp_lock);
 114                 GOTO(out_free, rc = -ENOENT);
 115         }
 116
 117         spin_unlock(&imp->imp_lock);
 118         RETURN(0);
 119 out_free:
 120         if (imp_conn)
 121                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 122 out_put:
 123         ptlrpc_connection_put(ptlrpc_conn);
 124         RETURN(rc);
 125 }
 126
 127 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 128 {
 129         return import_set_conn(imp, uuid, 1, 0);
 130 }
 131
 132 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 133                            int priority)
 134 {
 135         return import_set_conn(imp, uuid, priority, 1);
 136 }
 137 EXPORT_SYMBOL(client_import_add_conn);
 138
 139 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 140 {
 141         struct obd_import_conn *imp_conn;
 142         struct obd_export *dlmexp;
 143         int rc = -ENOENT;
 144         ENTRY;
 145
 146         spin_lock(&imp->imp_lock);
 147         if (list_empty(&imp->imp_conn_list)) {
 148                 LASSERT(!imp->imp_connection);
 149                 GOTO(out, rc);
 150         }
 151
 152         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 153                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 154                         continue;
 155                 LASSERT(imp_conn->oic_conn);
 156
 157                 if (imp_conn == imp->imp_conn_current) {
 158                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 159
 160                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 161                             imp->imp_state != LUSTRE_IMP_DISCON) {
 162                                 CERROR("can't remove current connection\n");
 163                                 GOTO(out, rc = -EBUSY);
 164                         }
 165
 166                         ptlrpc_connection_put(imp->imp_connection);
 167                         imp->imp_connection = NULL;
 168
 169                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 170                         if (dlmexp && dlmexp->exp_connection) {
 171                                 LASSERT(dlmexp->exp_connection ==
 172                                         imp_conn->oic_conn);
 173                                 ptlrpc_connection_put(dlmexp->exp_connection);
 174                                 dlmexp->exp_connection = NULL;
 175                         }
 176                 }
 177
 178                 list_del(&imp_conn->oic_item);
 179                 ptlrpc_connection_put(imp_conn->oic_conn);
 180                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 181                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 182                        imp, imp->imp_obd->obd_name, uuid->uuid);
 183                 rc = 0;
 184                 break;
 185         }
 186 out:
 187         spin_unlock(&imp->imp_lock);
 188         if (rc == -ENOENT)
 189                 CERROR("connection %s not found\n", uuid->uuid);
 190         RETURN(rc);
 191 }
 192 EXPORT_SYMBOL(client_import_del_conn);
 193
 194 /**
 195  * Find conn UUID by peer NID. \a peer is a server NID. This function is used
 196  * to find a conn uuid of \a imp which can reach \a peer.
 197  */
 198 int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
 199                             struct obd_uuid *uuid)
 200 {
 201         struct obd_import_conn *conn;
 202         int rc = -ENOENT;
 203         ENTRY;
 204
 205         spin_lock(&imp->imp_lock);
 206         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 207                 /* Check if conn UUID does have this peer NID. */
 208                 if (class_check_uuid(&conn->oic_uuid, peer)) {
 209                         *uuid = conn->oic_uuid;
 210                         rc = 0;
 211                         break;
 212                 }
 213         }
 214         spin_unlock(&imp->imp_lock);
 215         RETURN(rc);
 216 }
 217 EXPORT_SYMBOL(client_import_find_conn);
 218
 219 void client_destroy_import(struct obd_import *imp)
 220 {
 221         /* Drop security policy instance after all RPCs have finished/aborted
 222          * to let all busy contexts be released. */
 223         class_import_get(imp);
 224         class_destroy_import(imp);
 225         sptlrpc_import_sec_put(imp);
 226         class_import_put(imp);
 227 }
 228 EXPORT_SYMBOL(client_destroy_import);
 229
 230 /**
 231  * Check whether or not the OSC is on MDT.
 232  * In the config log,
 233  * osc on MDT
 234  *      setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
 235  * osc on client
 236  *      setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
 237  *
 238  **/
 239 static int osc_on_mdt(char *obdname)
 240 {
 241         char *ptr;
 242
 243         ptr = strrchr(obdname, '-');
 244         if (ptr == NULL)
 245                 return 0;
 246
 247         if (strncmp(ptr + 1, "MDT", 3) == 0)
 248                 return 1;
 249
 250         return 0;
 251 }
 252
 253 /* Configure an RPC client OBD device.
 254  *
 255  * lcfg parameters:
 256  * 1 - client UUID
 257  * 2 - server UUID
 258  * 3 - inactive-on-startup
 259  */
 260 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 261 {
 262         struct client_obd *cli = &obddev->u.cli;
 263         struct obd_import *imp;
 264         struct obd_uuid server_uuid;
 265         int rq_portal, rp_portal, connect_op;
 266         char *name = obddev->obd_type->typ_name;
 267         ldlm_ns_type_t ns_type = LDLM_NS_TYPE_UNKNOWN;
 268         int rc;
 269         ENTRY;
 270
 271         /* In a more perfect world, we would hang a ptlrpc_client off of
 272          * obd_type and just use the values from there. */
 273         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 274                 rq_portal = OST_REQUEST_PORTAL;
 275                 rp_portal = OSC_REPLY_PORTAL;
 276                 connect_op = OST_CONNECT;
 277                 cli->cl_sp_me = LUSTRE_SP_CLI;
 278                 cli->cl_sp_to = LUSTRE_SP_OST;
 279                 ns_type = LDLM_NS_TYPE_OSC;
 280         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
 281                    !strcmp(name, LUSTRE_LWP_NAME)) {
 282                 rq_portal = MDS_REQUEST_PORTAL;
 283                 rp_portal = MDC_REPLY_PORTAL;
 284                 connect_op = MDS_CONNECT;
 285                 cli->cl_sp_me = LUSTRE_SP_CLI;
 286                 cli->cl_sp_to = LUSTRE_SP_MDT;
 287                 ns_type = LDLM_NS_TYPE_MDC;
 288         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
 289                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
 290                         /* OSP_on_MDT for other MDTs */
 291                         connect_op = MDS_CONNECT;
 292                         cli->cl_sp_to = LUSTRE_SP_MDT;
 293                         ns_type = LDLM_NS_TYPE_MDC;
 294                         rq_portal = OUT_PORTAL;
 295                 } else {
 296                         /* OSP on MDT for OST */
 297                         connect_op = OST_CONNECT;
 298                         cli->cl_sp_to = LUSTRE_SP_OST;
 299                         ns_type = LDLM_NS_TYPE_OSC;
 300                         rq_portal = OST_REQUEST_PORTAL;
 301                 }
 302                 rp_portal = OSC_REPLY_PORTAL;
 303                 cli->cl_sp_me = LUSTRE_SP_CLI;
 304         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 305                 rq_portal = MGS_REQUEST_PORTAL;
 306                 rp_portal = MGC_REPLY_PORTAL;
 307                 connect_op = MGS_CONNECT;
 308                 cli->cl_sp_me = LUSTRE_SP_MGC;
 309                 cli->cl_sp_to = LUSTRE_SP_MGS;
 310                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 311                 ns_type = LDLM_NS_TYPE_MGC;
 312         } else {
 313                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 314                        name);
 315                 RETURN(-EINVAL);
 316         }
 317
 318         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 319                 CERROR("requires a TARGET UUID\n");
 320                 RETURN(-EINVAL);
 321         }
 322
 323         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 324                 CERROR("client UUID must be less than 38 characters\n");
 325                 RETURN(-EINVAL);
 326         }
 327
 328         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 329                 CERROR("setup requires a SERVER UUID\n");
 330                 RETURN(-EINVAL);
 331         }
 332
 333         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 334                 CERROR("target UUID must be less than 38 characters\n");
 335                 RETURN(-EINVAL);
 336         }
 337
 338         init_rwsem(&cli->cl_sem);
 339         mutex_init(&cli->cl_mgc_mutex);
 340         cli->cl_conn_count = 0;
 341         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 342                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 343                      sizeof(server_uuid)));
 344
 345         cli->cl_dirty_pages = 0;
 346         cli->cl_avail_grant = 0;
 347         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
 348         /* cl_dirty_max_pages may be changed at connect time in
 349          * ptlrpc_connect_interpret(). */
 350         client_adjust_max_dirty(cli);
 351         INIT_LIST_HEAD(&cli->cl_cache_waiters);
 352         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 353         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 354         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 355         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 356         client_obd_list_lock_init(&cli->cl_loi_list_lock);
 357         atomic_set(&cli->cl_pending_w_pages, 0);
 358         atomic_set(&cli->cl_pending_r_pages, 0);
 359         cli->cl_r_in_flight = 0;
 360         cli->cl_w_in_flight = 0;
 361
 362         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 363         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 364         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 365         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 366         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 367         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 368
 369         /* lru for osc. */
 370         INIT_LIST_HEAD(&cli->cl_lru_osc);
 371         atomic_set(&cli->cl_lru_shrinkers, 0);
 372         atomic_long_set(&cli->cl_lru_busy, 0);
 373         atomic_long_set(&cli->cl_lru_in_list, 0);
 374         INIT_LIST_HEAD(&cli->cl_lru_list);
 375         client_obd_list_lock_init(&cli->cl_lru_list_lock);
 376         atomic_long_set(&cli->cl_unstable_count, 0);
 377
 378         init_waitqueue_head(&cli->cl_destroy_waitq);
 379         atomic_set(&cli->cl_destroy_in_flight, 0);
 380 #ifdef ENABLE_CHECKSUM
 381         /* Turn on checksumming by default. */
 382         cli->cl_checksum = 1;
 383         /*
 384          * The supported checksum types will be worked out at connect time
 385          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 386          * through procfs.
 387          */
 388         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 389 #endif
 390         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 391
 392         /* This value may be reduced at connect time in
 393          * ptlrpc_connect_interpret() . We initialize it to only
 394          * 1MB until we know what the performance looks like.
 395          * In the future this should likely be increased. LU-1431 */
 396         cli->cl_max_pages_per_rpc = min_t(int, PTLRPC_MAX_BRW_PAGES,
 397                                           LNET_MTU >> PAGE_CACHE_SHIFT);
 398
 399         /* set cl_chunkbits default value to PAGE_CACHE_SHIFT,
 400          * it will be updated at OSC connection time. */
 401         cli->cl_chunkbits = PAGE_CACHE_SHIFT;
 402
 403         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 404                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 405         } else if (totalram_pages >> (20 - PAGE_CACHE_SHIFT) <= 128 /* MB */) {
 406                 cli->cl_max_rpcs_in_flight = 2;
 407         } else if (totalram_pages >> (20 - PAGE_CACHE_SHIFT) <= 256 /* MB */) {
 408                 cli->cl_max_rpcs_in_flight = 3;
 409         } else if (totalram_pages >> (20 - PAGE_CACHE_SHIFT) <= 512 /* MB */) {
 410                 cli->cl_max_rpcs_in_flight = 4;
 411         } else {
 412                 if (osc_on_mdt(obddev->obd_name))
 413                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_MAX;
 414                 else
 415                         cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 416         }
 417         rc = ldlm_get_ref();
 418         if (rc) {
 419                 CERROR("ldlm_get_ref failed: %d\n", rc);
 420                 GOTO(err, rc);
 421         }
 422
 423         ptlrpc_init_client(rq_portal, rp_portal, name,
 424                            &obddev->obd_ldlm_client);
 425
 426         imp = class_new_import(obddev);
 427         if (imp == NULL)
 428                 GOTO(err_ldlm, rc = -ENOENT);
 429         imp->imp_client = &obddev->obd_ldlm_client;
 430         imp->imp_connect_op = connect_op;
 431         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 432                LUSTRE_CFG_BUFLEN(lcfg, 1));
 433         class_import_put(imp);
 434
 435         rc = client_import_add_conn(imp, &server_uuid, 1);
 436         if (rc) {
 437                 CERROR("can't add initial connection\n");
 438                 GOTO(err_import, rc);
 439         }
 440
 441         cli->cl_import = imp;
 442         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 443         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 444         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 445
 446         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 447                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 448                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 449                                name, obddev->obd_name,
 450                                cli->cl_target_uuid.uuid);
 451                         spin_lock(&imp->imp_lock);
 452                         imp->imp_deactive = 1;
 453                         spin_unlock(&imp->imp_lock);
 454                 }
 455         }
 456
 457         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 458                                                    LDLM_NAMESPACE_CLIENT,
 459                                                    LDLM_NAMESPACE_GREEDY,
 460                                                    ns_type);
 461         if (obddev->obd_namespace == NULL) {
 462                 CERROR("Unable to create client namespace - %s\n",
 463                        obddev->obd_name);
 464                 GOTO(err_import, rc = -ENOMEM);
 465         }
 466
 467         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 468
 469         RETURN(rc);
 470
 471 err_import:
 472         class_destroy_import(imp);
 473 err_ldlm:
 474         ldlm_put_ref();
 475 err:
 476         RETURN(rc);
 477
 478 }
 479 EXPORT_SYMBOL(client_obd_setup);
 480
 481 int client_obd_cleanup(struct obd_device *obddev)
 482 {
 483         ENTRY;
 484
 485         ldlm_namespace_free_post(obddev->obd_namespace);
 486         obddev->obd_namespace = NULL;
 487
 488         obd_cleanup_client_import(obddev);
 489         LASSERT(obddev->u.cli.cl_import == NULL);
 490
 491         ldlm_put_ref();
 492         RETURN(0);
 493 }
 494 EXPORT_SYMBOL(client_obd_cleanup);
 495
 496 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 497 int client_connect_import(const struct lu_env *env,
 498                           struct obd_export **exp,
 499                           struct obd_device *obd, struct obd_uuid *cluuid,
 500                           struct obd_connect_data *data, void *localdata)
 501 {
 502         struct client_obd       *cli    = &obd->u.cli;
 503         struct obd_import       *imp    = cli->cl_import;
 504         struct obd_connect_data *ocd;
 505         struct lustre_handle    conn    = { 0 };
 506         int                     rc;
 507         ENTRY;
 508
 509         *exp = NULL;
 510         down_write(&cli->cl_sem);
 511         if (cli->cl_conn_count > 0 )
 512                 GOTO(out_sem, rc = -EALREADY);
 513
 514         rc = class_connect(&conn, obd, cluuid);
 515         if (rc)
 516                 GOTO(out_sem, rc);
 517
 518         cli->cl_conn_count++;
 519         *exp = class_conn2export(&conn);
 520
 521         LASSERT(obd->obd_namespace);
 522
 523         imp->imp_dlm_handle = conn;
 524         rc = ptlrpc_init_import(imp);
 525         if (rc != 0)
 526                 GOTO(out_ldlm, rc);
 527
 528         ocd = &imp->imp_connect_data;
 529         if (data) {
 530                 *ocd = *data;
 531                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 532         }
 533
 534         rc = ptlrpc_connect_import(imp);
 535         if (rc != 0) {
 536                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 537                 GOTO(out_ldlm, rc);
 538         }
 539         LASSERT(*exp != NULL && (*exp)->exp_connection);
 540
 541         if (data) {
 542                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 543                          ocd->ocd_connect_flags, "old "LPX64", new "LPX64"\n",
 544                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 545                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 546         }
 547
 548         ptlrpc_pinger_add_import(imp);
 549
 550         EXIT;
 551
 552         if (rc) {
 553 out_ldlm:
 554                 cli->cl_conn_count--;
 555                 class_disconnect(*exp);
 556                 *exp = NULL;
 557         }
 558 out_sem:
 559         up_write(&cli->cl_sem);
 560
 561         return rc;
 562 }
 563 EXPORT_SYMBOL(client_connect_import);
 564
 565 int client_disconnect_export(struct obd_export *exp)
 566 {
 567         struct obd_device *obd = class_exp2obd(exp);
 568         struct client_obd *cli;
 569         struct obd_import *imp;
 570         int rc = 0, err;
 571         ENTRY;
 572
 573         if (!obd) {
 574                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 575                        exp, exp ? exp->exp_handle.h_cookie : -1);
 576                 RETURN(-EINVAL);
 577         }
 578
 579         cli = &obd->u.cli;
 580         imp = cli->cl_import;
 581
 582         down_write(&cli->cl_sem);
 583         CDEBUG(D_INFO, "disconnect %s - %d\n", obd->obd_name,
 584                cli->cl_conn_count);
 585
 586         if (!cli->cl_conn_count) {
 587                 CERROR("disconnecting disconnected device (%s)\n",
 588                        obd->obd_name);
 589                 GOTO(out_disconnect, rc = -EINVAL);
 590         }
 591
 592         cli->cl_conn_count--;
 593         if (cli->cl_conn_count)
 594                 GOTO(out_disconnect, rc = 0);
 595
 596         /* Mark import deactivated now, so we don't try to reconnect if any
 597          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 598          * fully deactivate the import, or that would drop all requests. */
 599         spin_lock(&imp->imp_lock);
 600         imp->imp_deactive = 1;
 601         spin_unlock(&imp->imp_lock);
 602
 603         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 604          * delete it regardless.  (It's safe to delete an import that was
 605          * never added.) */
 606         (void)ptlrpc_pinger_del_import(imp);
 607
 608         if (obd->obd_namespace != NULL) {
 609                 /* obd_force == local only */
 610                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 611                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 612                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 613         }
 614
 615         /* There's no need to hold sem while disconnecting an import,
 616          * and it may actually cause deadlock in GSS. */
 617         up_write(&cli->cl_sem);
 618         rc = ptlrpc_disconnect_import(imp, 0);
 619         down_write(&cli->cl_sem);
 620
 621         ptlrpc_invalidate_import(imp);
 622
 623         EXIT;
 624
 625 out_disconnect:
 626         /* Use server style - class_disconnect should be always called for
 627          * o_disconnect. */
 628         err = class_disconnect(exp);
 629         if (!rc && err)
 630                 rc = err;
 631
 632         up_write(&cli->cl_sem);
 633
 634         RETURN(rc);
 635 }
 636 EXPORT_SYMBOL(client_disconnect_export);
 637
 638 #ifdef HAVE_SERVER_SUPPORT
 639 int server_disconnect_export(struct obd_export *exp)
 640 {
 641         int rc;
 642         ENTRY;
 643
 644         /* Disconnect early so that clients can't keep using export. */
 645         rc = class_disconnect(exp);
 646         /* Close import to avoid sending any requests. */
 647         if (exp->exp_imp_reverse)
 648                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 649
 650         if (exp->exp_obd->obd_namespace != NULL)
 651                 ldlm_cancel_locks_for_export(exp);
 652
 653         /* complete all outstanding replies */
 654         spin_lock(&exp->exp_lock);
 655         while (!list_empty(&exp->exp_outstanding_replies)) {
 656                 struct ptlrpc_reply_state *rs =
 657                         list_entry(exp->exp_outstanding_replies.next,
 658                                        struct ptlrpc_reply_state, rs_exp_list);
 659                 struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
 660
 661                 spin_lock(&svcpt->scp_rep_lock);
 662
 663                 list_del_init(&rs->rs_exp_list);
 664                 spin_lock(&rs->rs_lock);
 665                 ptlrpc_schedule_difficult_reply(rs);
 666                 spin_unlock(&rs->rs_lock);
 667
 668                 spin_unlock(&svcpt->scp_rep_lock);
 669         }
 670         spin_unlock(&exp->exp_lock);
 671
 672         RETURN(rc);
 673 }
 674 EXPORT_SYMBOL(server_disconnect_export);
 675
 676 /* --------------------------------------------------------------------------
 677  * from old lib/target.c
 678  * -------------------------------------------------------------------------- */
 679
 680 static int target_handle_reconnect(struct lustre_handle *conn,
 681                                    struct obd_export *exp,
 682                                    struct obd_uuid *cluuid)
 683 {
 684         ENTRY;
 685
 686         if (exp->exp_connection && exp->exp_imp_reverse) {
 687                 struct lustre_handle *hdl;
 688                 struct obd_device *target;
 689
 690                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 691                 target = exp->exp_obd;
 692
 693                 /* Might be a re-connect after a partition. */
 694                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 695                         if (target->obd_recovering) {
 696                                 int timeout = cfs_duration_sec(cfs_time_sub(
 697                                         cfs_timer_deadline(
 698                                         &target->obd_recovery_timer),
 699                                         cfs_time_current()));
 700
 701                                 LCONSOLE_WARN("%s: Client %s (at %s) reconnect"
 702                                         "ing, waiting for %d clients in recov"
 703                                         "ery for %d:%.02d\n", target->obd_name,
 704                                         obd_uuid2str(&exp->exp_client_uuid),
 705                                         obd_export_nid2str(exp),
 706                                         target->obd_max_recoverable_clients,
 707                                         timeout / 60, timeout % 60);
 708                         } else {
 709                                 LCONSOLE_WARN("%s: Client %s (at %s) "
 710                                         "reconnecting\n", target->obd_name,
 711                                         obd_uuid2str(&exp->exp_client_uuid),
 712                                         obd_export_nid2str(exp));
 713                         }
 714
 715                         conn->cookie = exp->exp_handle.h_cookie;
 716                         /* target_handle_connect() treats EALREADY and
 717                          * -EALREADY differently.  EALREADY means we are
 718                          * doing a valid reconnect from the same client. */
 719                         RETURN(EALREADY);
 720                 } else {
 721                         LCONSOLE_WARN("%s: already connected client %s (at %s) "
 722                                       "with handle "LPX64". Rejecting client "
 723                                       "with the same UUID trying to reconnect "
 724                                       "with handle "LPX64"\n", target->obd_name,
 725                                       obd_uuid2str(&exp->exp_client_uuid),
 726                                       obd_export_nid2str(exp),
 727                                       hdl->cookie, conn->cookie);
 728                         memset(conn, 0, sizeof *conn);
 729                         /* target_handle_connect() treats EALREADY and
 730                          * -EALREADY differently.  -EALREADY is an error
 731                          * (same UUID, different handle). */
 732                         RETURN(-EALREADY);
 733                 }
 734         }
 735
 736         conn->cookie = exp->exp_handle.h_cookie;
 737         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
 738                cluuid->uuid, exp, conn->cookie);
 739         RETURN(0);
 740 }
 741
 742 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
 743                           int error)
 744 {
 745         struct obd_export *exp = cb_data;
 746
 747         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 748                obd->obd_name, exp->exp_client_uuid.uuid);
 749
 750         spin_lock(&exp->exp_lock);
 751         exp->exp_need_sync = 0;
 752         spin_unlock(&exp->exp_lock);
 753         class_export_cb_put(exp);
 754 }
 755 EXPORT_SYMBOL(target_client_add_cb);
 756
 757 static void
 758 check_and_start_recovery_timer(struct obd_device *obd,
 759                                struct ptlrpc_request *req, int new_client);
 760
 761 int target_handle_connect(struct ptlrpc_request *req)
 762 {
 763         struct obd_device *target = NULL, *targref = NULL;
 764         struct obd_export *export = NULL;
 765         struct obd_import *revimp;
 766         struct obd_import *tmp_imp = NULL;
 767         struct lustre_handle conn;
 768         struct lustre_handle *tmp;
 769         struct obd_uuid tgtuuid;
 770         struct obd_uuid cluuid;
 771         struct obd_uuid remote_uuid;
 772         char *str;
 773         int rc = 0;
 774         char *target_start;
 775         int target_len;
 776         bool     mds_conn = false, lw_client = false;
 777         struct obd_connect_data *data, *tmpdata;
 778         int size, tmpsize;
 779         lnet_nid_t *client_nid = NULL;
 780         ENTRY;
 781
 782         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 783
 784         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 785         if (str == NULL) {
 786                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 787                 GOTO(out, rc = -EINVAL);
 788         }
 789
 790         obd_str2uuid(&tgtuuid, str);
 791         target = class_uuid2obd(&tgtuuid);
 792         if (!target)
 793                 target = class_name2obd(str);
 794
 795         if (!target) {
 796                 deuuidify(str, NULL, &target_start, &target_len);
 797                 LCONSOLE_ERROR_MSG(0x137, "%s: not available for connect "
 798                                    "from %s (no target). If you are running "
 799                                    "an HA pair check that the target is "
 800                                    "mounted on the other server.\n", str,
 801                                    libcfs_nid2str(req->rq_peer.nid));
 802                 GOTO(out, rc = -ENODEV);
 803         }
 804
 805         spin_lock(&target->obd_dev_lock);
 806         if (target->obd_stopping || !target->obd_set_up) {
 807                 spin_unlock(&target->obd_dev_lock);
 808
 809                 deuuidify(str, NULL, &target_start, &target_len);
 810                 LCONSOLE_INFO("%.*s: Not available for connect from %s (%s)\n",
 811                               target_len, target_start,
 812                               libcfs_nid2str(req->rq_peer.nid),
 813                               (target->obd_stopping ?
 814                                "stopping" : "not set up"));
 815                 GOTO(out, rc = -ENODEV);
 816         }
 817
 818         if (target->obd_no_conn) {
 819                 spin_unlock(&target->obd_dev_lock);
 820
 821                 CDEBUG(D_INFO, "%s: Temporarily refusing client connection "
 822                                "from %s\n", target->obd_name,
 823                                libcfs_nid2str(req->rq_peer.nid));
 824                 GOTO(out, rc = -EAGAIN);
 825         }
 826
 827         /* Make sure the target isn't cleaned up while we're here. Yes,
 828          * there's still a race between the above check and our incref here.
 829          * Really, class_uuid2obd should take the ref. */
 830         targref = class_incref(target, __FUNCTION__, current);
 831
 832         target->obd_conn_inprogress++;
 833         spin_unlock(&target->obd_dev_lock);
 834
 835         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
 836         if (str == NULL) {
 837                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
 838                 GOTO(out, rc = -EINVAL);
 839         }
 840
 841         obd_str2uuid(&cluuid, str);
 842
 843         /* XXX Extract a nettype and format accordingly. */
 844         switch (sizeof(lnet_nid_t)) {
 845         /* NB the casts only avoid compiler warnings. */
 846         case 8:
 847                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 848                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
 849                 break;
 850         case 4:
 851                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 852                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
 853                 break;
 854         default:
 855                 LBUG();
 856         }
 857
 858         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 859         if (tmp == NULL)
 860                 GOTO(out, rc = -EPROTO);
 861
 862         conn = *tmp;
 863
 864         size = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
 865                                     RCL_CLIENT);
 866         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 867         if (!data)
 868                 GOTO(out, rc = -EPROTO);
 869
 870         rc = req_capsule_server_pack(&req->rq_pill);
 871         if (rc)
 872                 GOTO(out, rc);
 873
 874         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 875                 if (data->ocd_version < LUSTRE_VERSION_CODE -
 876                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
 877                     data->ocd_version > LUSTRE_VERSION_CODE +
 878                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
 879                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
 880                                   "libclient connection attempt",
 881                                   data->ocd_version < LUSTRE_VERSION_CODE ?
 882                                   "old" : "new",
 883                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
 884                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
 885                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
 886                                   OBD_OCD_VERSION_FIX(data->ocd_version));
 887                         data = req_capsule_server_sized_get(&req->rq_pill,
 888                                                             &RMF_CONNECT_DATA,
 889                                     offsetof(typeof(*data), ocd_version) +
 890                                              sizeof(data->ocd_version));
 891                         if (data) {
 892                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
 893                                 data->ocd_version = LUSTRE_VERSION_CODE;
 894                         }
 895                         GOTO(out, rc = -EPROTO);
 896                 }
 897         }
 898
 899         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) {
 900                 mds_conn = (data->ocd_connect_flags & OBD_CONNECT_MDS) != 0;
 901                 lw_client = (data->ocd_connect_flags &
 902                              OBD_CONNECT_LIGHTWEIGHT) != 0;
 903         }
 904
 905         /* lctl gets a backstage, all-access pass. */
 906         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 907                 goto dont_check_exports;
 908
 909         export = cfs_hash_lookup(target->obd_uuid_hash, &cluuid);
 910         if (!export)
 911                 goto no_export;
 912
 913         /* We've found an export in the hash. */
 914
 915         spin_lock(&export->exp_lock);
 916
 917         if (export->exp_connecting) { /* bug 9635, et. al. */
 918                 spin_unlock(&export->exp_lock);
 919                 LCONSOLE_WARN("%s: Export %p already connecting from %s\n",
 920                               export->exp_obd->obd_name, export,
 921                               libcfs_nid2str(req->rq_peer.nid));
 922                 class_export_put(export);
 923                 export = NULL;
 924                 rc = -EALREADY;
 925         } else if ((mds_conn || lw_client) && export->exp_connection != NULL) {
 926                 spin_unlock(&export->exp_lock);
 927                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid)
 928                         /* MDS or LWP reconnected after failover. */
 929                         LCONSOLE_WARN("%s: Received %s connection from "
 930                             "%s, removing former export from %s\n",
 931                             target->obd_name, mds_conn ? "MDS" : "LWP",
 932                             libcfs_nid2str(req->rq_peer.nid),
 933                             libcfs_nid2str(export->exp_connection->c_peer.nid));
 934                 else
 935                         /* New MDS connection from the same NID. */
 936                         LCONSOLE_WARN("%s: Received new %s connection from "
 937                                 "%s, removing former export from same NID\n",
 938                                 target->obd_name, mds_conn ? "MDS" : "LWP",
 939                                 libcfs_nid2str(req->rq_peer.nid));
 940                 class_fail_export(export);
 941                 class_export_put(export);
 942                 export = NULL;
 943                 rc = 0;
 944         } else if (export->exp_connection != NULL &&
 945                    req->rq_peer.nid != export->exp_connection->c_peer.nid &&
 946                    (lustre_msg_get_op_flags(req->rq_reqmsg) &
 947                     MSG_CONNECT_INITIAL)) {
 948                 spin_unlock(&export->exp_lock);
 949                 /* In MDS failover we have static UUID but NID can change. */
 950                 LCONSOLE_WARN("%s: Client %s seen on new nid %s when "
 951                               "existing nid %s is already connected\n",
 952                               target->obd_name, cluuid.uuid,
 953                               libcfs_nid2str(req->rq_peer.nid),
 954                               libcfs_nid2str(
 955                                       export->exp_connection->c_peer.nid));
 956                 rc = -EALREADY;
 957                 class_export_put(export);
 958                 export = NULL;
 959         } else {
 960                 export->exp_connecting = 1;
 961                 spin_unlock(&export->exp_lock);
 962                 LASSERT(export->exp_obd == target);
 963
 964                 rc = target_handle_reconnect(&conn, export, &cluuid);
 965         }
 966
 967         /* If we found an export, we already unlocked. */
 968         if (!export) {
 969 no_export:
 970                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
 971         } else if (req->rq_export == NULL &&
 972                    atomic_read(&export->exp_rpc_count) > 0) {
 973                 LCONSOLE_WARN("%s: Client %s (at %s) refused connection, "
 974                               "still busy with %d references\n",
 975                               target->obd_name, cluuid.uuid,
 976                               libcfs_nid2str(req->rq_peer.nid),
 977                               atomic_read(&export->exp_refcount));
 978                 GOTO(out, rc = -EBUSY);
 979         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
 980                 if (!strstr(cluuid.uuid, "mdt"))
 981                         LCONSOLE_WARN("%s: Rejecting reconnect from the "
 982                                       "known client %s (at %s) because it "
 983                                       "is indicating it is a new client",
 984                                       target->obd_name, cluuid.uuid,
 985                                       libcfs_nid2str(req->rq_peer.nid));
 986                 GOTO(out, rc = -EALREADY);
 987         } else {
 988                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
 989         }
 990
 991         if (rc < 0) {
 992                 GOTO(out, rc);
 993         }
 994
 995         CDEBUG(D_HA, "%s: connection from %s@%s %st"LPU64" exp %p cur %ld last %ld\n",
 996                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 997               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
 998               export, (long)cfs_time_current_sec(),
 999               export ? (long)export->exp_last_request_time : 0);
1000
1001         /* If this is the first time a client connects, reset the recovery
1002          * timer. Discard lightweight connections which might be local. */
1003         if (!lw_client && rc == 0 && target->obd_recovering)
1004                 check_and_start_recovery_timer(target, req, export == NULL);
1005
1006         /* We want to handle EALREADY but *not* -EALREADY from
1007          * target_handle_reconnect(), return reconnection state in a flag. */
1008         if (rc == EALREADY) {
1009                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
1010                 rc = 0;
1011         } else {
1012                 LASSERT(rc == 0);
1013         }
1014
1015         /* Tell the client if we support replayable requests. */
1016         if (target->obd_replayable)
1017                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
1018         client_nid = &req->rq_peer.nid;
1019
1020         if (export == NULL) {
1021                 /* allow lightweight connections during recovery */
1022                 if (target->obd_recovering && !lw_client) {
1023                         cfs_time_t t;
1024                         int     c; /* connected */
1025                         int     i; /* in progress */
1026                         int     k; /* known */
1027                         int     s; /* stale/evicted */
1028
1029                         c = atomic_read(&target->obd_connected_clients);
1030                         i = atomic_read(&target->obd_lock_replay_clients);
1031                         k = target->obd_max_recoverable_clients;
1032                         s = target->obd_stale_clients;
1033                         t = cfs_timer_deadline(&target->obd_recovery_timer);
1034                         t = cfs_time_sub(t, cfs_time_current());
1035                         t = cfs_duration_sec(t);
1036                         LCONSOLE_WARN("%s: Denying connection for new client "
1037                                       "%s (at %s), waiting for all %d known "
1038                                       "clients (%d recovered, %d in progress, "
1039                                       "and %d evicted) to recover in %d:%.02d\n",
1040                                       target->obd_name, cluuid.uuid,
1041                                       libcfs_nid2str(req->rq_peer.nid), k,
1042                                       c - i, i, s, (int)t / 60,
1043                                       (int)t % 60);
1044                         rc = -EBUSY;
1045                 } else {
1046 dont_check_exports:
1047                         rc = obd_connect(req->rq_svc_thread->t_env,
1048                                          &export, target, &cluuid, data,
1049                                          client_nid);
1050                         if (mds_conn && OBD_FAIL_CHECK(OBD_FAIL_TGT_RCVG_FLAG))
1051                                 lustre_msg_add_op_flags(req->rq_repmsg,
1052                                                 MSG_CONNECT_RECOVERING);
1053                         if (rc == 0)
1054                                 conn.cookie = export->exp_handle.h_cookie;
1055                 }
1056         } else {
1057                 rc = obd_reconnect(req->rq_svc_thread->t_env,
1058                                    export, target, &cluuid, data, client_nid);
1059         }
1060         if (rc)
1061                 GOTO(out, rc);
1062
1063 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 6, 53, 0)
1064         /* 2.2.0 clients always swab nidtbl entries due to a bug, so server
1065          * will do the swabbing for if the client is using the same endianness.
1066          *
1067          * This fixup is version-limited, because we don't want to carry the
1068          * OBD_CONNECT_MNE_SWAB flag around forever, just so long as we need
1069          * interop with unpatched 2.2 clients.  For newer clients, servers
1070          * will never do MNE swabbing, let the client handle that.  LU-1644 */
1071         spin_lock(&export->exp_lock);
1072         export->exp_need_mne_swab = !ptlrpc_req_need_swab(req) &&
1073                         !(data->ocd_connect_flags & OBD_CONNECT_MNE_SWAB);
1074         spin_unlock(&export->exp_lock);
1075 #endif
1076
1077         LASSERT(target->u.obt.obt_magic == OBT_MAGIC);
1078         data->ocd_instance = target->u.obt.obt_instance;
1079
1080         /* Return only the parts of obd_connect_data that we understand, so the
1081          * client knows that we don't understand the rest. */
1082         if (data) {
1083                 tmpsize = req_capsule_get_size(&req->rq_pill, &RMF_CONNECT_DATA,
1084                                                RCL_SERVER);
1085                 tmpdata = req_capsule_server_get(&req->rq_pill,
1086                                                  &RMF_CONNECT_DATA);
1087                 /* Don't use struct assignment here, because the client reply
1088                  * buffer may be smaller/larger than the local struct
1089                  * obd_connect_data. */
1090                 memcpy(tmpdata, data, min(tmpsize, size));
1091         }
1092
1093         /* If all else goes well, this is our RPC return code. */
1094         req->rq_status = 0;
1095
1096         lustre_msg_set_handle(req->rq_repmsg, &conn);
1097
1098         /* If the client and the server are the same node, we will already
1099          * have an export that really points to the client's DLM export,
1100          * because we have a shared handles table.
1101          *
1102          * XXX this will go away when shaver stops sending the "connect" handle
1103          * in the real "remote handle" field of the request --phik 24 Apr 2003
1104          */
1105         ptlrpc_request_change_export(req, export);
1106
1107         spin_lock(&export->exp_lock);
1108         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
1109                 spin_unlock(&export->exp_lock);
1110                 CDEBUG(D_RPCTRACE, "%s: %s already connected at greater "
1111                        "or equal conn_cnt: %d >= %d\n",
1112                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
1113                        export->exp_conn_cnt,
1114                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
1115
1116                 GOTO(out, rc = -EALREADY);
1117         }
1118         LASSERT(lustre_msg_get_conn_cnt(req->rq_reqmsg) > 0);
1119         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
1120
1121         /* Don't evict liblustre clients for not pinging. */
1122         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
1123                 export->exp_libclient = 1;
1124                 spin_unlock(&export->exp_lock);
1125
1126                 spin_lock(&target->obd_dev_lock);
1127                 list_del_init(&export->exp_obd_chain_timed);
1128                 spin_unlock(&target->obd_dev_lock);
1129         } else {
1130                 spin_unlock(&export->exp_lock);
1131         }
1132
1133         if (export->exp_connection != NULL) {
1134                 /* Check to see if connection came from another NID. */
1135                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
1136                     !hlist_unhashed(&export->exp_nid_hash))
1137                         cfs_hash_del(export->exp_obd->obd_nid_hash,
1138                                      &export->exp_connection->c_peer.nid,
1139                                      &export->exp_nid_hash);
1140
1141                 ptlrpc_connection_put(export->exp_connection);
1142         }
1143
1144         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
1145                                                        req->rq_self,
1146                                                        &remote_uuid);
1147         if (hlist_unhashed(&export->exp_nid_hash)) {
1148                 cfs_hash_add(export->exp_obd->obd_nid_hash,
1149                              &export->exp_connection->c_peer.nid,
1150                              &export->exp_nid_hash);
1151         }
1152
1153         if (target->obd_recovering && !export->exp_in_recovery && !lw_client) {
1154                 int has_transno;
1155                 __u64 transno = data->ocd_transno;
1156
1157                 spin_lock(&export->exp_lock);
1158                 /* possible race with class_disconnect_stale_exports,
1159                  * export may be already in the eviction process */
1160                 if (export->exp_failed) {
1161                         spin_unlock(&export->exp_lock);
1162                         GOTO(out, rc = -ENODEV);
1163                 }
1164                 export->exp_in_recovery = 1;
1165                 export->exp_req_replay_needed = 1;
1166                 export->exp_lock_replay_needed = 1;
1167                 spin_unlock(&export->exp_lock);
1168
1169                 has_transno = !!(lustre_msg_get_op_flags(req->rq_reqmsg) &
1170                                  MSG_CONNECT_TRANSNO);
1171                 if (has_transno && transno == 0)
1172                         CWARN("Connect with zero transno!\n");
1173
1174                 if (has_transno && transno > 0 &&
1175                     transno < target->obd_next_recovery_transno &&
1176                     transno > target->obd_last_committed) {
1177                         /* Another way is to use cmpxchg() to be lock-free. */
1178                         spin_lock(&target->obd_recovery_task_lock);
1179                         if (transno < target->obd_next_recovery_transno)
1180                                 target->obd_next_recovery_transno = transno;
1181                         spin_unlock(&target->obd_recovery_task_lock);
1182                 }
1183
1184                 atomic_inc(&target->obd_req_replay_clients);
1185                 atomic_inc(&target->obd_lock_replay_clients);
1186                 if (atomic_inc_return(&target->obd_connected_clients) ==
1187                     target->obd_max_recoverable_clients)
1188                         wake_up(&target->obd_next_transno_waitq);
1189         }
1190
1191         /* Tell the client we're in recovery, when client is involved in it. */
1192         if (target->obd_recovering && !lw_client)
1193                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
1194
1195         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1196         conn = *tmp;
1197
1198         /* Return -ENOTCONN in case of errors to let client reconnect. */
1199         revimp = class_new_import(target);
1200         if (revimp == NULL) {
1201                 CERROR("fail to alloc new reverse import.\n");
1202                 GOTO(out, rc = -ENOTCONN);
1203         }
1204
1205         spin_lock(&export->exp_lock);
1206         if (export->exp_imp_reverse != NULL)
1207                 /* destroyed import can be still referenced in ctxt */
1208                 tmp_imp = export->exp_imp_reverse;
1209         export->exp_imp_reverse = revimp;
1210         spin_unlock(&export->exp_lock);
1211
1212         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
1213         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
1214         revimp->imp_remote_handle = conn;
1215         revimp->imp_dlm_fake = 1;
1216         revimp->imp_state = LUSTRE_IMP_FULL;
1217
1218         /* Unknown versions will be caught in
1219          * ptlrpc_handle_server_req_in->lustre_unpack_msg(). */
1220         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1221
1222         if ((data->ocd_connect_flags & OBD_CONNECT_AT) &&
1223             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1224                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1225         else
1226                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1227
1228         if ((data->ocd_connect_flags & OBD_CONNECT_FULL20) &&
1229             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1230                 revimp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
1231         else
1232                 revimp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
1233
1234         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
1235         if (rc) {
1236                 CERROR("Failed to get sec for reverse import: %d\n", rc);
1237                 spin_lock(&export->exp_lock);
1238                 export->exp_imp_reverse = NULL;
1239                 spin_unlock(&export->exp_lock);
1240                 class_destroy_import(revimp);
1241         }
1242
1243         class_import_put(revimp);
1244
1245 out:
1246         if (tmp_imp != NULL)
1247                 client_destroy_import(tmp_imp);
1248         if (export) {
1249                 spin_lock(&export->exp_lock);
1250                 export->exp_connecting = 0;
1251                 spin_unlock(&export->exp_lock);
1252
1253                 class_export_put(export);
1254         }
1255         if (targref) {
1256                 spin_lock(&target->obd_dev_lock);
1257                 target->obd_conn_inprogress--;
1258                 spin_unlock(&target->obd_dev_lock);
1259
1260                 class_decref(targref, __func__, current);
1261         }
1262         if (rc)
1263                 req->rq_status = rc;
1264         RETURN(rc);
1265 }
1266 EXPORT_SYMBOL(target_handle_connect);
1267
1268 int target_handle_disconnect(struct ptlrpc_request *req)
1269 {
1270         int rc;
1271         ENTRY;
1272
1273         rc = req_capsule_server_pack(&req->rq_pill);
1274         if (rc)
1275                 RETURN(rc);
1276
1277         /* Keep the rq_export around so we can send the reply. */
1278         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1279
1280         RETURN(0);
1281 }
1282 EXPORT_SYMBOL(target_handle_disconnect);
1283
1284 void target_destroy_export(struct obd_export *exp)
1285 {
1286         struct obd_import       *imp = NULL;
1287         /* exports created from last_rcvd data, and "fake"
1288            exports created by lctl don't have an import */
1289         spin_lock(&exp->exp_lock);
1290         if (exp->exp_imp_reverse != NULL) {
1291                 imp = exp->exp_imp_reverse;
1292                 exp->exp_imp_reverse = NULL;
1293         }
1294         spin_unlock(&exp->exp_lock);
1295         if (imp != NULL)
1296                 client_destroy_import(imp);
1297
1298         LASSERT_ATOMIC_ZERO(&exp->exp_locks_count);
1299         LASSERT_ATOMIC_ZERO(&exp->exp_rpc_count);
1300         LASSERT_ATOMIC_ZERO(&exp->exp_cb_count);
1301         LASSERT_ATOMIC_ZERO(&exp->exp_replay_count);
1302 }
1303 EXPORT_SYMBOL(target_destroy_export);
1304
1305 /*
1306  * Recovery functions
1307  */
1308 static void target_request_copy_get(struct ptlrpc_request *req)
1309 {
1310         class_export_rpc_inc(req->rq_export);
1311         LASSERT(list_empty(&req->rq_list));
1312         INIT_LIST_HEAD(&req->rq_replay_list);
1313
1314         /* Increase refcount to keep request in queue. */
1315         atomic_inc(&req->rq_refcount);
1316         /* Let export know it has replays to be handled. */
1317         atomic_inc(&req->rq_export->exp_replay_count);
1318 }
1319
1320 static void target_request_copy_put(struct ptlrpc_request *req)
1321 {
1322         LASSERT(list_empty(&req->rq_replay_list));
1323         LASSERT_ATOMIC_POS(&req->rq_export->exp_replay_count);
1324
1325         atomic_dec(&req->rq_export->exp_replay_count);
1326         class_export_rpc_dec(req->rq_export);
1327         ptlrpc_server_drop_request(req);
1328 }
1329
1330 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1331 {
1332         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1333         struct obd_export     *exp = req->rq_export;
1334         struct ptlrpc_request *reqiter;
1335         int                    dup = 0;
1336
1337         LASSERT(exp);
1338
1339         spin_lock(&exp->exp_lock);
1340         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1341                                 rq_replay_list) {
1342                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1343                         dup = 1;
1344                         break;
1345                 }
1346         }
1347
1348         if (dup) {
1349                 /* We expect it with RESENT and REPLAY flags. */
1350                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1351                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1352                         CERROR("invalid flags %x of resent replay\n",
1353                                lustre_msg_get_flags(req->rq_reqmsg));
1354         } else {
1355                 list_add_tail(&req->rq_replay_list,
1356                                   &exp->exp_req_replay_queue);
1357         }
1358
1359         spin_unlock(&exp->exp_lock);
1360         return dup;
1361 }
1362
1363 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1364 {
1365         LASSERT(!list_empty(&req->rq_replay_list));
1366         LASSERT(req->rq_export);
1367
1368         spin_lock(&req->rq_export->exp_lock);
1369         list_del_init(&req->rq_replay_list);
1370         spin_unlock(&req->rq_export->exp_lock);
1371 }
1372
1373 static void target_finish_recovery(struct obd_device *obd)
1374 {
1375         ENTRY;
1376
1377         /* Only log a recovery message when recovery has occurred. */
1378         if (obd->obd_recovery_start) {
1379                 time_t elapsed_time = max_t(time_t, 1, cfs_time_current_sec() -
1380                                         obd->obd_recovery_start);
1381                 LCONSOLE_INFO("%s: Recovery over after %d:%.02d, of %d clients "
1382                         "%d recovered and %d %s evicted.\n", obd->obd_name,
1383                         (int)elapsed_time / 60, (int)elapsed_time % 60,
1384                         obd->obd_max_recoverable_clients,
1385                         atomic_read(&obd->obd_connected_clients),
1386                         obd->obd_stale_clients,
1387                         obd->obd_stale_clients == 1 ? "was" : "were");
1388         }
1389
1390         ldlm_reprocess_all_ns(obd->obd_namespace);
1391         spin_lock(&obd->obd_recovery_task_lock);
1392         if (!list_empty(&obd->obd_req_replay_queue) ||
1393             !list_empty(&obd->obd_lock_replay_queue) ||
1394             !list_empty(&obd->obd_final_req_queue)) {
1395                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1396                        obd->obd_name,
1397                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1398                        list_empty(&obd->obd_lock_replay_queue) ? \
1399                                "" : "lock ",
1400                        list_empty(&obd->obd_final_req_queue) ? \
1401                                "" : "final ");
1402                 spin_unlock(&obd->obd_recovery_task_lock);
1403                 LBUG();
1404         }
1405         spin_unlock(&obd->obd_recovery_task_lock);
1406
1407         obd->obd_recovery_end = cfs_time_current_sec();
1408
1409         /* When recovery finished, cleanup orphans on MDS and OST. */
1410         if (OBT(obd) && OBP(obd, postrecov)) {
1411                 int rc = OBP(obd, postrecov)(obd);
1412                 if (rc < 0)
1413                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1414                                       obd->obd_name, rc);
1415         }
1416         EXIT;
1417 }
1418
1419 static void abort_req_replay_queue(struct obd_device *obd)
1420 {
1421         struct ptlrpc_request *req, *n;
1422         struct list_head abort_list;
1423
1424         INIT_LIST_HEAD(&abort_list);
1425         spin_lock(&obd->obd_recovery_task_lock);
1426         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1427         spin_unlock(&obd->obd_recovery_task_lock);
1428         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1429                 DEBUG_REQ(D_WARNING, req, "aborted:");
1430                 req->rq_status = -ENOTCONN;
1431                 if (ptlrpc_error(req)) {
1432                         DEBUG_REQ(D_ERROR, req,
1433                                   "failed abort_req_reply; skipping");
1434                 }
1435                 target_exp_dequeue_req_replay(req);
1436                 target_request_copy_put(req);
1437         }
1438 }
1439
1440 static void abort_lock_replay_queue(struct obd_device *obd)
1441 {
1442         struct ptlrpc_request *req, *n;
1443         struct list_head abort_list;
1444
1445         INIT_LIST_HEAD(&abort_list);
1446         spin_lock(&obd->obd_recovery_task_lock);
1447         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1448         spin_unlock(&obd->obd_recovery_task_lock);
1449         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1450                 DEBUG_REQ(D_ERROR, req, "aborted:");
1451                 req->rq_status = -ENOTCONN;
1452                 if (ptlrpc_error(req)) {
1453                         DEBUG_REQ(D_ERROR, req,
1454                                   "failed abort_lock_reply; skipping");
1455                 }
1456                 target_request_copy_put(req);
1457         }
1458 }
1459
1460 /* Called from a cleanup function if the device is being cleaned up
1461    forcefully.  The exports should all have been disconnected already,
1462    the only thing left to do is
1463      - clear the recovery flags
1464      - cancel the timer
1465      - free queued requests and replies, but don't send replies
1466    Because the obd_stopping flag is set, no new requests should be received.
1467
1468 */
1469 void target_cleanup_recovery(struct obd_device *obd)
1470 {
1471         struct ptlrpc_request *req, *n;
1472         struct list_head clean_list;
1473         ENTRY;
1474
1475         INIT_LIST_HEAD(&clean_list);
1476         spin_lock(&obd->obd_dev_lock);
1477         if (!obd->obd_recovering) {
1478                 spin_unlock(&obd->obd_dev_lock);
1479                 EXIT;
1480                 return;
1481         }
1482         obd->obd_recovering = obd->obd_abort_recovery = 0;
1483         spin_unlock(&obd->obd_dev_lock);
1484
1485         spin_lock(&obd->obd_recovery_task_lock);
1486         target_cancel_recovery_timer(obd);
1487         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1488         spin_unlock(&obd->obd_recovery_task_lock);
1489
1490         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1491                 LASSERT(req->rq_reply_state == 0);
1492                 target_exp_dequeue_req_replay(req);
1493                 target_request_copy_put(req);
1494         }
1495
1496         spin_lock(&obd->obd_recovery_task_lock);
1497         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1498         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1499         spin_unlock(&obd->obd_recovery_task_lock);
1500
1501         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1502                 LASSERT(req->rq_reply_state == 0);
1503                 target_request_copy_put(req);
1504         }
1505
1506         EXIT;
1507 }
1508 EXPORT_SYMBOL(target_cleanup_recovery);
1509
1510 /* obd_recovery_task_lock should be held */
1511 void target_cancel_recovery_timer(struct obd_device *obd)
1512 {
1513         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1514         cfs_timer_disarm(&obd->obd_recovery_timer);
1515 }
1516 EXPORT_SYMBOL(target_cancel_recovery_timer);
1517
1518 static void target_start_recovery_timer(struct obd_device *obd)
1519 {
1520         if (obd->obd_recovery_start != 0)
1521                 return;
1522
1523         spin_lock(&obd->obd_dev_lock);
1524         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1525                 spin_unlock(&obd->obd_dev_lock);
1526                 return;
1527         }
1528
1529         LASSERT(obd->obd_recovery_timeout != 0);
1530
1531         if (obd->obd_recovery_start != 0) {
1532                 spin_unlock(&obd->obd_dev_lock);
1533                 return;
1534         }
1535
1536         cfs_timer_arm(&obd->obd_recovery_timer,
1537                       cfs_time_shift(obd->obd_recovery_timeout));
1538         obd->obd_recovery_start = cfs_time_current_sec();
1539         spin_unlock(&obd->obd_dev_lock);
1540
1541         LCONSOLE_WARN("%s: Will be in recovery for at least %d:%.02d, "
1542                       "or until %d client%s reconnect%s\n",
1543                       obd->obd_name,
1544                       obd->obd_recovery_timeout / 60,
1545                       obd->obd_recovery_timeout % 60,
1546                       obd->obd_max_recoverable_clients,
1547                       (obd->obd_max_recoverable_clients == 1) ? "" : "s",
1548                       (obd->obd_max_recoverable_clients == 1) ? "s": "");
1549 }
1550
1551 /**
1552  * extend recovery window.
1553  *
1554  * if @extend is true, extend recovery window to have @drt remaining at least;
1555  * otherwise, make sure the recovery timeout value is not less than @drt.
1556  */
1557 static void extend_recovery_timer(struct obd_device *obd, int drt, bool extend)
1558 {
1559         cfs_time_t now;
1560         cfs_time_t end;
1561         cfs_duration_t left;
1562         int to;
1563
1564         spin_lock(&obd->obd_dev_lock);
1565         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1566                 spin_unlock(&obd->obd_dev_lock);
1567                 return;
1568         }
1569         LASSERT(obd->obd_recovery_start != 0);
1570
1571         now  = cfs_time_current_sec();
1572         to   = obd->obd_recovery_timeout;
1573         end  = obd->obd_recovery_start + to;
1574         left = cfs_time_sub(end, now);
1575
1576         if (extend && (drt > left)) {
1577                 to += drt - left;
1578         } else if (!extend && (drt > to)) {
1579                 to = drt;
1580                 /* reduce drt by already passed time */
1581                 drt -= obd->obd_recovery_timeout - left;
1582         }
1583
1584         if (to > obd->obd_recovery_time_hard)
1585                 to = obd->obd_recovery_time_hard;
1586         if (obd->obd_recovery_timeout < to ||
1587             obd->obd_recovery_timeout == obd->obd_recovery_time_hard) {
1588                 obd->obd_recovery_timeout = to;
1589                 cfs_timer_arm(&obd->obd_recovery_timer,
1590                               cfs_time_shift(drt));
1591         }
1592         spin_unlock(&obd->obd_dev_lock);
1593
1594         CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
1595                obd->obd_name, (unsigned)drt);
1596 }
1597
1598 /* Reset the timer with each new client connection */
1599 /*
1600  * This timer is actually reconnect_timer, which is for making sure
1601  * the total recovery window is at least as big as my reconnect
1602  * attempt timing. So the initial recovery time_out will be set to
1603  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1604  * from client is bigger than this, then the recovery time_out will
1605  * be extended to make sure the client could be reconnected, in the
1606  * process, the timeout from the new client should be ignored.
1607  */
1608
1609 static void
1610 check_and_start_recovery_timer(struct obd_device *obd,
1611                                struct ptlrpc_request *req,
1612                                int new_client)
1613 {
1614         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1615         struct obd_device_target *obt = &obd->u.obt;
1616
1617         if (!new_client && service_time)
1618                 /* Teach server about old server's estimates, as first guess
1619                  * at how long new requests will take. */
1620                 at_measured(&req->rq_rqbd->rqbd_svcpt->scp_at_estimate,
1621                             service_time);
1622
1623         target_start_recovery_timer(obd);
1624
1625         /* Convert the service time to RPC timeout,
1626          * and reuse service_time to limit stack usage. */
1627         service_time = at_est2timeout(service_time);
1628
1629         /* We expect other clients to timeout within service_time, then try
1630          * to reconnect, then try the failover server.  The max delay between
1631          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL. */
1632         service_time += 2 * INITIAL_CONNECT_TIMEOUT;
1633
1634         LASSERT(obt->obt_magic == OBT_MAGIC);
1635         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC);
1636         if (service_time > obd->obd_recovery_timeout && !new_client)
1637                 extend_recovery_timer(obd, service_time, false);
1638 }
1639
1640 /** Health checking routines */
1641 static inline int exp_connect_healthy(struct obd_export *exp)
1642 {
1643         return (exp->exp_in_recovery);
1644 }
1645
1646 /** if export done req_replay or has replay in queue */
1647 static inline int exp_req_replay_healthy(struct obd_export *exp)
1648 {
1649         return (!exp->exp_req_replay_needed ||
1650                 atomic_read(&exp->exp_replay_count) > 0);
1651 }
1652 /** if export done lock_replay or has replay in queue */
1653 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1654 {
1655         return (!exp->exp_lock_replay_needed ||
1656                 atomic_read(&exp->exp_replay_count) > 0);
1657 }
1658
1659 static inline int exp_vbr_healthy(struct obd_export *exp)
1660 {
1661         return (!exp->exp_vbr_failed);
1662 }
1663
1664 static inline int exp_finished(struct obd_export *exp)
1665 {
1666         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1667 }
1668
1669 /** Checking routines for recovery */
1670 static int check_for_clients(struct obd_device *obd)
1671 {
1672         unsigned int clnts = atomic_read(&obd->obd_connected_clients);
1673
1674         if (obd->obd_abort_recovery || obd->obd_recovery_expired)
1675                 return 1;
1676         LASSERT(clnts <= obd->obd_max_recoverable_clients);
1677         return (clnts + obd->obd_stale_clients ==
1678                 obd->obd_max_recoverable_clients);
1679 }
1680
1681 static int check_for_next_transno(struct obd_device *obd)
1682 {
1683         struct ptlrpc_request *req = NULL;
1684         int wake_up = 0, connected, completed, queue_len;
1685         __u64 next_transno, req_transno;
1686         ENTRY;
1687
1688         spin_lock(&obd->obd_recovery_task_lock);
1689         if (!list_empty(&obd->obd_req_replay_queue)) {
1690                 req = list_entry(obd->obd_req_replay_queue.next,
1691                                      struct ptlrpc_request, rq_list);
1692                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1693         } else {
1694                 req_transno = 0;
1695         }
1696
1697         connected = atomic_read(&obd->obd_connected_clients);
1698         completed = connected - atomic_read(&obd->obd_req_replay_clients);
1699         queue_len = obd->obd_requests_queued_for_recovery;
1700         next_transno = obd->obd_next_recovery_transno;
1701
1702         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1703                "req_transno: "LPU64", next_transno: "LPU64"\n",
1704                obd->obd_max_recoverable_clients, connected, completed,
1705                queue_len, req_transno, next_transno);
1706
1707         if (obd->obd_abort_recovery) {
1708                 CDEBUG(D_HA, "waking for aborted recovery\n");
1709                 wake_up = 1;
1710         } else if (obd->obd_recovery_expired) {
1711                 CDEBUG(D_HA, "waking for expired recovery\n");
1712                 wake_up = 1;
1713         } else if (req_transno == next_transno) {
1714                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1715                 wake_up = 1;
1716         } else if (queue_len > 0 &&
1717                    queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1718                 int d_lvl = D_HA;
1719                 /** handle gaps occured due to lost reply or VBR */
1720                 LASSERTF(req_transno >= next_transno,
1721                          "req_transno: "LPU64", next_transno: "LPU64"\n",
1722                          req_transno, next_transno);
1723                 if (req_transno > obd->obd_last_committed &&
1724                     !obd->obd_version_recov)
1725                         d_lvl = D_ERROR;
1726                 CDEBUG(d_lvl,
1727                        "%s: waking for gap in transno, VBR is %s (skip: "
1728                        LPD64", ql: %d, comp: %d, conn: %d, next: "LPD64
1729                        ", last_committed: "LPD64")\n",
1730                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1731                        next_transno, queue_len, completed, connected,
1732                        req_transno, obd->obd_last_committed);
1733                 obd->obd_next_recovery_transno = req_transno;
1734                 wake_up = 1;
1735         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1736                 CDEBUG(D_HA, "waking for completed recovery\n");
1737                 wake_up = 1;
1738         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1739                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1740                        " by fail_lock, waking up ("LPD64")\n", next_transno);
1741                 obd->obd_next_recovery_transno = req_transno;
1742                 wake_up = 1;
1743         }
1744         spin_unlock(&obd->obd_recovery_task_lock);
1745         return wake_up;
1746 }
1747
1748 static int check_for_next_lock(struct obd_device *obd)
1749 {
1750         int wake_up = 0;
1751
1752         spin_lock(&obd->obd_recovery_task_lock);
1753         if (!list_empty(&obd->obd_lock_replay_queue)) {
1754                 CDEBUG(D_HA, "waking for next lock\n");
1755                 wake_up = 1;
1756         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1757                 CDEBUG(D_HA, "waking for completed lock replay\n");
1758                 wake_up = 1;
1759         } else if (obd->obd_abort_recovery) {
1760                 CDEBUG(D_HA, "waking for aborted recovery\n");
1761                 wake_up = 1;
1762         } else if (obd->obd_recovery_expired) {
1763                 CDEBUG(D_HA, "waking for expired recovery\n");
1764                 wake_up = 1;
1765         }
1766         spin_unlock(&obd->obd_recovery_task_lock);
1767
1768         return wake_up;
1769 }
1770
1771 /**
1772  * wait for recovery events,
1773  * check its status with help of check_routine
1774  * evict dead clients via health_check
1775  */
1776 static int target_recovery_overseer(struct obd_device *obd,
1777                                     int (*check_routine)(struct obd_device *),
1778                                     int (*health_check)(struct obd_export *))
1779 {
1780 repeat:
1781         wait_event(obd->obd_next_transno_waitq, check_routine(obd));
1782         if (obd->obd_abort_recovery) {
1783                 CWARN("recovery is aborted, evict exports in recovery\n");
1784                 /** evict exports which didn't finish recovery yet */
1785                 class_disconnect_stale_exports(obd, exp_finished);
1786                 return 1;
1787         } else if (obd->obd_recovery_expired) {
1788                 obd->obd_recovery_expired = 0;
1789                 /** If some clients died being recovered, evict them */
1790                 LCONSOLE_WARN("%s: recovery is timed out, "
1791                               "evict stale exports\n", obd->obd_name);
1792                 /** evict cexports with no replay in queue, they are stalled */
1793                 class_disconnect_stale_exports(obd, health_check);
1794                 /** continue with VBR */
1795                 spin_lock(&obd->obd_dev_lock);
1796                 obd->obd_version_recov = 1;
1797                 spin_unlock(&obd->obd_dev_lock);
1798                 /**
1799                  * reset timer, recovery will proceed with versions now,
1800                  * timeout is set just to handle reconnection delays
1801                  */
1802                 extend_recovery_timer(obd, RECONNECT_DELAY_MAX, true);
1803                 /** Wait for recovery events again, after evicting bad clients */
1804                 goto repeat;
1805         }
1806         return 0;
1807 }
1808
1809 static struct ptlrpc_request *target_next_replay_req(struct obd_device *obd)
1810 {
1811         struct ptlrpc_request *req = NULL;
1812         ENTRY;
1813
1814         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1815                 obd->obd_next_recovery_transno);
1816
1817         CFS_FAIL_TIMEOUT(OBD_FAIL_TGT_REPLAY_DELAY2, cfs_fail_val);
1818
1819         if (target_recovery_overseer(obd, check_for_next_transno,
1820                                      exp_req_replay_healthy)) {
1821                 abort_req_replay_queue(obd);
1822                 abort_lock_replay_queue(obd);
1823         }
1824
1825         spin_lock(&obd->obd_recovery_task_lock);
1826         if (!list_empty(&obd->obd_req_replay_queue)) {
1827                 req = list_entry(obd->obd_req_replay_queue.next,
1828                                      struct ptlrpc_request, rq_list);
1829                 list_del_init(&req->rq_list);
1830                 obd->obd_requests_queued_for_recovery--;
1831                 spin_unlock(&obd->obd_recovery_task_lock);
1832         } else {
1833                 spin_unlock(&obd->obd_recovery_task_lock);
1834                 LASSERT(list_empty(&obd->obd_req_replay_queue));
1835                 LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
1836                 /** evict exports failed VBR */
1837                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1838         }
1839         RETURN(req);
1840 }
1841
1842 static struct ptlrpc_request *target_next_replay_lock(struct obd_device *obd)
1843 {
1844         struct ptlrpc_request *req = NULL;
1845
1846         CDEBUG(D_HA, "Waiting for lock\n");
1847         if (target_recovery_overseer(obd, check_for_next_lock,
1848                                      exp_lock_replay_healthy))
1849                 abort_lock_replay_queue(obd);
1850
1851         spin_lock(&obd->obd_recovery_task_lock);
1852         if (!list_empty(&obd->obd_lock_replay_queue)) {
1853                 req = list_entry(obd->obd_lock_replay_queue.next,
1854                                      struct ptlrpc_request, rq_list);
1855                 list_del_init(&req->rq_list);
1856                 spin_unlock(&obd->obd_recovery_task_lock);
1857         } else {
1858                 spin_unlock(&obd->obd_recovery_task_lock);
1859                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
1860                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
1861                 /** evict exports failed VBR */
1862                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1863         }
1864         return req;
1865 }
1866
1867 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
1868 {
1869         struct ptlrpc_request *req = NULL;
1870
1871         spin_lock(&obd->obd_recovery_task_lock);
1872         if (!list_empty(&obd->obd_final_req_queue)) {
1873                 req = list_entry(obd->obd_final_req_queue.next,
1874                                      struct ptlrpc_request, rq_list);
1875                 list_del_init(&req->rq_list);
1876                 spin_unlock(&obd->obd_recovery_task_lock);
1877                 if (req->rq_export->exp_in_recovery) {
1878                         spin_lock(&req->rq_export->exp_lock);
1879                         req->rq_export->exp_in_recovery = 0;
1880                         spin_unlock(&req->rq_export->exp_lock);
1881                 }
1882         } else {
1883                 spin_unlock(&obd->obd_recovery_task_lock);
1884         }
1885         return req;
1886 }
1887
1888 static void handle_recovery_req(struct ptlrpc_thread *thread,
1889                                 struct ptlrpc_request *req,
1890                                 svc_handler_t handler)
1891 {
1892         ENTRY;
1893
1894         /**
1895          * export can be evicted during recovery, no need to handle replays for
1896          * it after that, discard such request silently
1897          */
1898         if (req->rq_export->exp_disconnected)
1899                 RETURN_EXIT;
1900
1901         req->rq_session.lc_thread = thread;
1902         req->rq_svc_thread = thread;
1903         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
1904
1905         /* thread context */
1906         lu_context_enter(&thread->t_env->le_ctx);
1907         (void)handler(req);
1908         lu_context_exit(&thread->t_env->le_ctx);
1909
1910         /* don't reset timer for final stage */
1911         if (!exp_finished(req->rq_export)) {
1912                 int to = obd_timeout;
1913
1914                 /**
1915                  * Add request timeout to the recovery time so next request from
1916                  * this client may come in recovery time
1917                  */
1918                 if (!AT_OFF) {
1919                         struct ptlrpc_service_part *svcpt;
1920
1921                         svcpt = req->rq_rqbd->rqbd_svcpt;
1922                         /* If the server sent early reply for this request,
1923                          * the client will recalculate the timeout according to
1924                          * current server estimate service time, so we will
1925                          * use the maxium timeout here for waiting the client
1926                          * sending the next req */
1927                         to = max((int)at_est2timeout(
1928                                  at_get(&svcpt->scp_at_estimate)),
1929                                  (int)lustre_msg_get_timeout(req->rq_reqmsg));
1930                         /* Add 2 net_latency, one for balance rq_deadline
1931                          * (see ptl_send_rpc), one for resend the req to server,
1932                          * Note: client will pack net_latency in replay req
1933                          * (see ptlrpc_replay_req) */
1934                         to += 2 * lustre_msg_get_service_time(req->rq_reqmsg);
1935                 }
1936                 extend_recovery_timer(class_exp2obd(req->rq_export), to, true);
1937         }
1938         EXIT;
1939 }
1940
1941 static int target_recovery_thread(void *arg)
1942 {
1943         struct lu_target *lut = arg;
1944         struct obd_device *obd = lut->lut_obd;
1945         struct ptlrpc_request *req;
1946         struct target_recovery_data *trd = &obd->obd_recovery_data;
1947         unsigned long delta;
1948         struct lu_env *env;
1949         struct ptlrpc_thread *thread = NULL;
1950         int rc = 0;
1951         ENTRY;
1952
1953         unshare_fs_struct();
1954         OBD_ALLOC_PTR(thread);
1955         if (thread == NULL)
1956                 RETURN(-ENOMEM);
1957
1958         OBD_ALLOC_PTR(env);
1959         if (env == NULL) {
1960                 OBD_FREE_PTR(thread);
1961                 RETURN(-ENOMEM);
1962         }
1963
1964         rc = lu_context_init(&env->le_ctx, LCT_MD_THREAD | LCT_DT_THREAD);
1965         if (rc) {
1966                 OBD_FREE_PTR(thread);
1967                 OBD_FREE_PTR(env);
1968                 RETURN(rc);
1969         }
1970
1971         thread->t_env = env;
1972         thread->t_id = -1; /* force filter_iobuf_get/put to use local buffers */
1973         env->le_ctx.lc_thread = thread;
1974         tgt_io_thread_init(thread); /* init thread_big_cache for IO requests */
1975         thread->t_watchdog = NULL;
1976
1977         CDEBUG(D_HA, "%s: started recovery thread pid %d\n", obd->obd_name,
1978                current_pid());
1979         trd->trd_processing_task = current_pid();
1980
1981         spin_lock(&obd->obd_dev_lock);
1982         obd->obd_recovering = 1;
1983         spin_unlock(&obd->obd_dev_lock);
1984         complete(&trd->trd_starting);
1985
1986         /* first of all, we have to know the first transno to replay */
1987         if (target_recovery_overseer(obd, check_for_clients,
1988                                      exp_connect_healthy)) {
1989                 abort_req_replay_queue(obd);
1990                 abort_lock_replay_queue(obd);
1991         }
1992
1993         /* next stage: replay requests */
1994         delta = jiffies;
1995         CDEBUG(D_INFO, "1: request replay stage - %d clients from t"LPU64"\n",
1996                atomic_read(&obd->obd_req_replay_clients),
1997                obd->obd_next_recovery_transno);
1998         while ((req = target_next_replay_req(obd))) {
1999                 LASSERT(trd->trd_processing_task == current_pid());
2000                 DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s",
2001                           lustre_msg_get_transno(req->rq_reqmsg),
2002                           libcfs_nid2str(req->rq_peer.nid));
2003                 handle_recovery_req(thread, req,
2004                                     trd->trd_recovery_handler);
2005                 /**
2006                  * bz18031: increase next_recovery_transno before
2007                  * target_request_copy_put() will drop exp_rpc reference
2008                  */
2009                 spin_lock(&obd->obd_recovery_task_lock);
2010                 obd->obd_next_recovery_transno++;
2011                 spin_unlock(&obd->obd_recovery_task_lock);
2012                 target_exp_dequeue_req_replay(req);
2013                 target_request_copy_put(req);
2014                 obd->obd_replayed_requests++;
2015         }
2016
2017         /**
2018          * The second stage: replay locks
2019          */
2020         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
2021                atomic_read(&obd->obd_lock_replay_clients));
2022         while ((req = target_next_replay_lock(obd))) {
2023                 LASSERT(trd->trd_processing_task == current_pid());
2024                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
2025                           libcfs_nid2str(req->rq_peer.nid));
2026                 handle_recovery_req(thread, req,
2027                                     trd->trd_recovery_handler);
2028                 target_request_copy_put(req);
2029                 obd->obd_replayed_locks++;
2030         }
2031
2032         /**
2033          * The third stage: reply on final pings, at this moment all clients
2034          * must have request in final queue
2035          */
2036         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
2037         /** Update server last boot epoch */
2038         tgt_boot_epoch_update(lut);
2039         /* We drop recoverying flag to forward all new requests
2040          * to regular mds_handle() since now */
2041         spin_lock(&obd->obd_dev_lock);
2042         obd->obd_recovering = obd->obd_abort_recovery = 0;
2043         spin_unlock(&obd->obd_dev_lock);
2044         spin_lock(&obd->obd_recovery_task_lock);
2045         target_cancel_recovery_timer(obd);
2046         spin_unlock(&obd->obd_recovery_task_lock);
2047         while ((req = target_next_final_ping(obd))) {
2048                 LASSERT(trd->trd_processing_task == current_pid());
2049                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
2050                           libcfs_nid2str(req->rq_peer.nid));
2051                 handle_recovery_req(thread, req,
2052                                     trd->trd_recovery_handler);
2053                 /* Because the waiting client can not send ping to server,
2054                  * so we need refresh the last_request_time, to avoid the
2055                  * export is being evicted */
2056                 ptlrpc_update_export_timer(req->rq_export, 0);
2057                 target_request_copy_put(req);
2058         }
2059
2060         delta = (jiffies - delta) / HZ;
2061         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
2062               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
2063         if (delta > OBD_RECOVERY_TIME_SOFT) {
2064                 CWARN("too long recovery - read logs\n");
2065                 libcfs_debug_dumplog();
2066         }
2067
2068         target_finish_recovery(obd);
2069
2070         lu_context_fini(&env->le_ctx);
2071         trd->trd_processing_task = 0;
2072         complete(&trd->trd_finishing);
2073
2074         tgt_io_thread_done(thread);
2075         OBD_FREE_PTR(thread);
2076         OBD_FREE_PTR(env);
2077         RETURN(rc);
2078 }
2079
2080 static int target_start_recovery_thread(struct lu_target *lut,
2081                                         svc_handler_t handler)
2082 {
2083         struct obd_device *obd = lut->lut_obd;
2084         int rc = 0;
2085         struct target_recovery_data *trd = &obd->obd_recovery_data;
2086
2087         memset(trd, 0, sizeof(*trd));
2088         init_completion(&trd->trd_starting);
2089         init_completion(&trd->trd_finishing);
2090         trd->trd_recovery_handler = handler;
2091
2092         if (!IS_ERR(kthread_run(target_recovery_thread,
2093                                 lut, "tgt_recov"))) {
2094                 wait_for_completion(&trd->trd_starting);
2095                 LASSERT(obd->obd_recovering != 0);
2096         } else {
2097                 rc = -ECHILD;
2098         }
2099
2100         return rc;
2101 }
2102
2103 void target_stop_recovery_thread(struct obd_device *obd)
2104 {
2105         if (obd->obd_recovery_data.trd_processing_task > 0) {
2106                 struct target_recovery_data *trd = &obd->obd_recovery_data;
2107                 /** recovery can be done but postrecovery is not yet */
2108                 spin_lock(&obd->obd_dev_lock);
2109                 if (obd->obd_recovering) {
2110                         CERROR("%s: Aborting recovery\n", obd->obd_name);
2111                         obd->obd_abort_recovery = 1;
2112                         wake_up(&obd->obd_next_transno_waitq);
2113                 }
2114                 spin_unlock(&obd->obd_dev_lock);
2115                 wait_for_completion(&trd->trd_finishing);
2116         }
2117 }
2118 EXPORT_SYMBOL(target_stop_recovery_thread);
2119
2120 void target_recovery_fini(struct obd_device *obd)
2121 {
2122         class_disconnect_exports(obd);
2123         target_stop_recovery_thread(obd);
2124         target_cleanup_recovery(obd);
2125 }
2126 EXPORT_SYMBOL(target_recovery_fini);
2127
2128 static void target_recovery_expired(unsigned long castmeharder)
2129 {
2130         struct obd_device *obd = (struct obd_device *)castmeharder;
2131         CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
2132                " after %lds (%d clients connected)\n",
2133                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
2134                cfs_time_current_sec()- obd->obd_recovery_start,
2135                atomic_read(&obd->obd_connected_clients));
2136
2137         obd->obd_recovery_expired = 1;
2138         wake_up(&obd->obd_next_transno_waitq);
2139 }
2140
2141 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
2142 {
2143         struct obd_device *obd = lut->lut_obd;
2144         if (obd->obd_max_recoverable_clients == 0) {
2145                 /** Update server last boot epoch */
2146                 tgt_boot_epoch_update(lut);
2147                 return;
2148         }
2149
2150         CDEBUG(D_HA, "RECOVERY: service %s, %d recoverable clients, "
2151                "last_transno "LPU64"\n", obd->obd_name,
2152                obd->obd_max_recoverable_clients, obd->obd_last_committed);
2153         LASSERT(obd->obd_stopping == 0);
2154         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
2155         obd->obd_recovery_start = 0;
2156         obd->obd_recovery_end = 0;
2157
2158         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
2159         target_start_recovery_thread(lut, handler);
2160 }
2161 EXPORT_SYMBOL(target_recovery_init);
2162
2163
2164 static int target_process_req_flags(struct obd_device *obd,
2165                                     struct ptlrpc_request *req)
2166 {
2167         struct obd_export *exp = req->rq_export;
2168         LASSERT(exp != NULL);
2169         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2170                 /* client declares he's ready to replay locks */
2171                 spin_lock(&exp->exp_lock);
2172                 if (exp->exp_req_replay_needed) {
2173                         exp->exp_req_replay_needed = 0;
2174                         spin_unlock(&exp->exp_lock);
2175
2176                         LASSERT_ATOMIC_POS(&obd->obd_req_replay_clients);
2177                         atomic_dec(&obd->obd_req_replay_clients);
2178                 } else {
2179                         spin_unlock(&exp->exp_lock);
2180                 }
2181         }
2182         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2183                 /* client declares he's ready to complete recovery
2184                  * so, we put the request on th final queue */
2185                 spin_lock(&exp->exp_lock);
2186                 if (exp->exp_lock_replay_needed) {
2187                         exp->exp_lock_replay_needed = 0;
2188                         spin_unlock(&exp->exp_lock);
2189
2190                         LASSERT_ATOMIC_POS(&obd->obd_lock_replay_clients);
2191                         atomic_dec(&obd->obd_lock_replay_clients);
2192                 } else {
2193                         spin_unlock(&exp->exp_lock);
2194                 }
2195         }
2196         return 0;
2197 }
2198
2199 int target_queue_recovery_request(struct ptlrpc_request *req,
2200                                   struct obd_device *obd)
2201 {
2202         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
2203         struct ptlrpc_request *reqiter;
2204         int inserted = 0;
2205         ENTRY;
2206
2207         if (obd->obd_recovery_data.trd_processing_task == current_pid()) {
2208                 /* Processing the queue right now, don't re-add. */
2209                 RETURN(1);
2210         }
2211
2212         target_process_req_flags(obd, req);
2213
2214         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
2215                 /* client declares he's ready to complete recovery
2216                  * so, we put the request on th final queue */
2217                 target_request_copy_get(req);
2218                 DEBUG_REQ(D_HA, req, "queue final req");
2219                 wake_up(&obd->obd_next_transno_waitq);
2220                 spin_lock(&obd->obd_recovery_task_lock);
2221                 if (obd->obd_recovering) {
2222                         list_add_tail(&req->rq_list,
2223                                           &obd->obd_final_req_queue);
2224                 } else {
2225                         spin_unlock(&obd->obd_recovery_task_lock);
2226                         target_request_copy_put(req);
2227                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
2228                 }
2229                 spin_unlock(&obd->obd_recovery_task_lock);
2230                 RETURN(0);
2231         }
2232         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
2233                 /* client declares he's ready to replay locks */
2234                 target_request_copy_get(req);
2235                 DEBUG_REQ(D_HA, req, "queue lock replay req");
2236                 wake_up(&obd->obd_next_transno_waitq);
2237                 spin_lock(&obd->obd_recovery_task_lock);
2238                 LASSERT(obd->obd_recovering);
2239                 /* usually due to recovery abort */
2240                 if (!req->rq_export->exp_in_recovery) {
2241                         spin_unlock(&obd->obd_recovery_task_lock);
2242                         target_request_copy_put(req);
2243                         RETURN(-ENOTCONN);
2244                 }
2245                 LASSERT(req->rq_export->exp_lock_replay_needed);
2246                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
2247                 spin_unlock(&obd->obd_recovery_task_lock);
2248                 RETURN(0);
2249         }
2250
2251         /* CAVEAT EMPTOR: The incoming request message has been swabbed
2252          * (i.e. buflens etc are in my own byte order), but type-dependent
2253          * buffers (eg mdt_body, ost_body etc) have NOT been swabbed. */
2254
2255         if (!transno) {
2256                 INIT_LIST_HEAD(&req->rq_list);
2257                 DEBUG_REQ(D_HA, req, "not queueing");
2258                 RETURN(1);
2259         }
2260
2261         /* If we're processing the queue, we want don't want to queue this
2262          * message.
2263          *
2264          * Also, if this request has a transno less than the one we're waiting
2265          * for, we should process it now.  It could (and currently always will)
2266          * be an open request for a descriptor that was opened some time ago.
2267          *
2268          * Also, a resent, replayed request that has already been
2269          * handled will pass through here and be processed immediately.
2270          */
2271         CDEBUG(D_HA, "Next recovery transno: "LPU64
2272                ", current: "LPU64", replaying\n",
2273                obd->obd_next_recovery_transno, transno);
2274         spin_lock(&obd->obd_recovery_task_lock);
2275         if (transno < obd->obd_next_recovery_transno) {
2276                 /* Processing the queue right now, don't re-add. */
2277                 LASSERT(list_empty(&req->rq_list));
2278                 spin_unlock(&obd->obd_recovery_task_lock);
2279                 RETURN(1);
2280         }
2281         spin_unlock(&obd->obd_recovery_task_lock);
2282
2283         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2284                 RETURN(0);
2285
2286         target_request_copy_get(req);
2287         if (!req->rq_export->exp_in_recovery) {
2288                 target_request_copy_put(req);
2289                 RETURN(-ENOTCONN);
2290         }
2291         LASSERT(req->rq_export->exp_req_replay_needed);
2292
2293         if (target_exp_enqueue_req_replay(req)) {
2294                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2295                 target_request_copy_put(req);
2296                 RETURN(0);
2297         }
2298
2299         /* XXX O(n^2) */
2300         spin_lock(&obd->obd_recovery_task_lock);
2301         LASSERT(obd->obd_recovering);
2302         list_for_each_entry(reqiter, &obd->obd_req_replay_queue, rq_list) {
2303                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2304                         list_add_tail(&req->rq_list, &reqiter->rq_list);
2305                         inserted = 1;
2306                         goto added;
2307                 }
2308
2309                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2310                              transno)) {
2311                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2312                                   "has been claimed by another client");
2313                         spin_unlock(&obd->obd_recovery_task_lock);
2314                         target_exp_dequeue_req_replay(req);
2315                         target_request_copy_put(req);
2316                         RETURN(0);
2317                 }
2318         }
2319 added:
2320         if (!inserted)
2321                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2322
2323         obd->obd_requests_queued_for_recovery++;
2324         spin_unlock(&obd->obd_recovery_task_lock);
2325         wake_up(&obd->obd_next_transno_waitq);
2326         RETURN(0);
2327 }
2328 EXPORT_SYMBOL(target_queue_recovery_request);
2329
2330 int target_handle_ping(struct ptlrpc_request *req)
2331 {
2332         obd_ping(req->rq_svc_thread->t_env, req->rq_export);
2333         return req_capsule_server_pack(&req->rq_pill);
2334 }
2335 EXPORT_SYMBOL(target_handle_ping);
2336
2337 void target_committed_to_req(struct ptlrpc_request *req)
2338 {
2339         struct obd_export *exp = req->rq_export;
2340
2341         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2342                 lustre_msg_set_last_committed(req->rq_repmsg,
2343                                               exp->exp_last_committed);
2344         else
2345                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2346                           "%d)", exp->exp_obd->obd_no_transno,
2347                           req->rq_repmsg == NULL);
2348
2349         CDEBUG(D_INFO, "last_committed "LPU64", transno "LPU64", xid "LPU64"\n",
2350                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2351 }
2352 EXPORT_SYMBOL(target_committed_to_req);
2353
2354 #endif /* HAVE_SERVER_SUPPORT */
2355
2356 /**
2357  * Packs current SLV and Limit into \a req.
2358  */
2359 int target_pack_pool_reply(struct ptlrpc_request *req)
2360 {
2361         struct obd_device *obd;
2362         ENTRY;
2363
2364         /* Check that we still have all structures alive as this may
2365          * be some late RPC at shutdown time. */
2366         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2367                      !exp_connect_lru_resize(req->rq_export))) {
2368                 lustre_msg_set_slv(req->rq_repmsg, 0);
2369                 lustre_msg_set_limit(req->rq_repmsg, 0);
2370                 RETURN(0);
2371         }
2372
2373         /* OBD is alive here as export is alive, which we checked above. */
2374         obd = req->rq_export->exp_obd;
2375
2376         read_lock(&obd->obd_pool_lock);
2377         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2378         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2379         read_unlock(&obd->obd_pool_lock);
2380
2381         RETURN(0);
2382 }
2383 EXPORT_SYMBOL(target_pack_pool_reply);
2384
2385 int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
2386 {
2387         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2388                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2389                 return (-ECOMM);
2390         }
2391
2392         if (unlikely(rc)) {
2393                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
2394                 req->rq_status = rc;
2395                 return (ptlrpc_send_error(req, 1));
2396         } else {
2397                 DEBUG_REQ(D_NET, req, "sending reply");
2398         }
2399
2400         return (ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT));
2401 }
2402
2403 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2404 {
2405         struct ptlrpc_service_part *svcpt;
2406         int                        netrc;
2407         struct ptlrpc_reply_state *rs;
2408         struct obd_export         *exp;
2409         ENTRY;
2410
2411         if (req->rq_no_reply) {
2412                 EXIT;
2413                 return;
2414         }
2415
2416         svcpt = req->rq_rqbd->rqbd_svcpt;
2417         rs = req->rq_reply_state;
2418         if (rs == NULL || !rs->rs_difficult) {
2419                 /* no notifiers */
2420                 target_send_reply_msg (req, rc, fail_id);
2421                 EXIT;
2422                 return;
2423         }
2424
2425         /* must be an export if locks saved */
2426         LASSERT(req->rq_export != NULL);
2427         /* req/reply consistent */
2428         LASSERT(rs->rs_svcpt == svcpt);
2429
2430         /* "fresh" reply */
2431         LASSERT(!rs->rs_scheduled);
2432         LASSERT(!rs->rs_scheduled_ever);
2433         LASSERT(!rs->rs_handled);
2434         LASSERT(!rs->rs_on_net);
2435         LASSERT(rs->rs_export == NULL);
2436         LASSERT(list_empty(&rs->rs_obd_list));
2437         LASSERT(list_empty(&rs->rs_exp_list));
2438
2439         exp = class_export_get(req->rq_export);
2440
2441         /* disable reply scheduling while I'm setting up */
2442         rs->rs_scheduled = 1;
2443         rs->rs_on_net    = 1;
2444         rs->rs_xid       = req->rq_xid;
2445         rs->rs_transno   = req->rq_transno;
2446         rs->rs_export    = exp;
2447         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
2448
2449         spin_lock(&exp->exp_uncommitted_replies_lock);
2450         CDEBUG(D_NET, "rs transno = "LPU64", last committed = "LPU64"\n",
2451                rs->rs_transno, exp->exp_last_committed);
2452         if (rs->rs_transno > exp->exp_last_committed) {
2453                 /* not committed already */
2454                 list_add_tail(&rs->rs_obd_list,
2455                                   &exp->exp_uncommitted_replies);
2456         }
2457         spin_unlock(&exp->exp_uncommitted_replies_lock);
2458
2459         spin_lock(&exp->exp_lock);
2460         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
2461         spin_unlock(&exp->exp_lock);
2462
2463         netrc = target_send_reply_msg(req, rc, fail_id);
2464
2465         spin_lock(&svcpt->scp_rep_lock);
2466
2467         atomic_inc(&svcpt->scp_nreps_difficult);
2468
2469         if (netrc != 0) {
2470                 /* error sending: reply is off the net.  Also we need +1
2471                  * reply ref until ptlrpc_handle_rs() is done
2472                  * with the reply state (if the send was successful, there
2473                  * would have been +1 ref for the net, which
2474                  * reply_out_callback leaves alone) */
2475                 rs->rs_on_net = 0;
2476                 ptlrpc_rs_addref(rs);
2477         }
2478
2479         spin_lock(&rs->rs_lock);
2480         if (rs->rs_transno <= exp->exp_last_committed ||
2481             (!rs->rs_on_net && !rs->rs_no_ack) ||
2482             list_empty(&rs->rs_exp_list) ||     /* completed already */
2483             list_empty(&rs->rs_obd_list)) {
2484                 CDEBUG(D_HA, "Schedule reply immediately\n");
2485                 ptlrpc_dispatch_difficult_reply(rs);
2486         } else {
2487                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
2488                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
2489         }
2490         spin_unlock(&rs->rs_lock);
2491         spin_unlock(&svcpt->scp_rep_lock);
2492         EXIT;
2493 }
2494 EXPORT_SYMBOL(target_send_reply);
2495
2496 ldlm_mode_t lck_compat_array[] = {
2497         [LCK_EX]    = LCK_COMPAT_EX,
2498         [LCK_PW]    = LCK_COMPAT_PW,
2499         [LCK_PR]    = LCK_COMPAT_PR,
2500         [LCK_CW]    = LCK_COMPAT_CW,
2501         [LCK_CR]    = LCK_COMPAT_CR,
2502         [LCK_NL]    = LCK_COMPAT_NL,
2503         [LCK_GROUP] = LCK_COMPAT_GROUP,
2504         [LCK_COS]   = LCK_COMPAT_COS,
2505 };
2506
2507 /**
2508  * Rather arbitrary mapping from LDLM error codes to errno values. This should
2509  * not escape to the user level.
2510  */
2511 int ldlm_error2errno(ldlm_error_t error)
2512 {
2513         int result;
2514
2515         switch (error) {
2516         case ELDLM_OK:
2517         case ELDLM_LOCK_MATCHED:
2518                 result = 0;
2519                 break;
2520         case ELDLM_LOCK_CHANGED:
2521                 result = -ESTALE;
2522                 break;
2523         case ELDLM_LOCK_ABORTED:
2524                 result = -ENAVAIL;
2525                 break;
2526         case ELDLM_LOCK_REPLACED:
2527                 result = -ESRCH;
2528                 break;
2529         case ELDLM_NO_LOCK_DATA:
2530                 result = -ENOENT;
2531                 break;
2532         case ELDLM_NAMESPACE_EXISTS:
2533                 result = -EEXIST;
2534                 break;
2535         case ELDLM_BAD_NAMESPACE:
2536                 result = -EBADF;
2537                 break;
2538         default:
2539                 if (((int)error) < 0)  /* cast to signed type */
2540                         result = error; /* as ldlm_error_t can be unsigned */
2541                 else {
2542                         CERROR("Invalid DLM result code: %d\n", error);
2543                         result = -EPROTO;
2544                 }
2545         }
2546         return result;
2547 }
2548 EXPORT_SYMBOL(ldlm_error2errno);
2549
2550 /**
2551  * Dual to ldlm_error2errno(): maps errno values back to ldlm_error_t.
2552  */
2553 ldlm_error_t ldlm_errno2error(int err_no)
2554 {
2555         int error;
2556
2557         switch (err_no) {
2558         case 0:
2559                 error = ELDLM_OK;
2560                 break;
2561         case -ESTALE:
2562                 error = ELDLM_LOCK_CHANGED;
2563                 break;
2564         case -ENAVAIL:
2565                 error = ELDLM_LOCK_ABORTED;
2566                 break;
2567         case -ESRCH:
2568                 error = ELDLM_LOCK_REPLACED;
2569                 break;
2570         case -ENOENT:
2571                 error = ELDLM_NO_LOCK_DATA;
2572                 break;
2573         case -EEXIST:
2574                 error = ELDLM_NAMESPACE_EXISTS;
2575                 break;
2576         case -EBADF:
2577                 error = ELDLM_BAD_NAMESPACE;
2578                 break;
2579         default:
2580                 error = err_no;
2581         }
2582         return error;
2583 }
2584 EXPORT_SYMBOL(ldlm_errno2error);
2585
2586 #if LUSTRE_TRACKS_LOCK_EXP_REFS
2587 void ldlm_dump_export_locks(struct obd_export *exp)
2588 {
2589         spin_lock(&exp->exp_locks_list_guard);
2590         if (!list_empty(&exp->exp_locks_list)) {
2591                 struct ldlm_lock *lock;
2592
2593                 CERROR("dumping locks for export %p,"
2594                        "ignore if the unmount doesn't hang\n", exp);
2595                 list_for_each_entry(lock, &exp->exp_locks_list,
2596                                         l_exp_refs_link)
2597                         LDLM_ERROR(lock, "lock:");
2598         }
2599         spin_unlock(&exp->exp_locks_list_guard);
2600 }
2601 #endif
2602
2603 #ifdef HAVE_SERVER_SUPPORT
2604 static int target_bulk_timeout(void *data)
2605 {
2606         ENTRY;
2607         /* We don't fail the connection here, because having the export
2608          * killed makes the (vital) call to commitrw very sad.
2609          */
2610         RETURN(1);
2611 }
2612
2613 static inline char *bulk2type(struct ptlrpc_bulk_desc *desc)
2614 {
2615         return desc->bd_type == BULK_GET_SINK ? "GET" : "PUT";
2616 }
2617
2618 int target_bulk_io(struct obd_export *exp, struct ptlrpc_bulk_desc *desc,
2619                    struct l_wait_info *lwi)
2620 {
2621         struct ptlrpc_request   *req = desc->bd_req;
2622         time_t                   start = cfs_time_current_sec();
2623         time_t                   deadline;
2624         int                      rc = 0;
2625
2626         ENTRY;
2627
2628         /* If there is eviction in progress, wait for it to finish. */
2629         if (unlikely(atomic_read(&exp->exp_obd->obd_evict_inprogress))) {
2630                 *lwi = LWI_INTR(NULL, NULL);
2631                 rc = l_wait_event(exp->exp_obd->obd_evict_inprogress_waitq,
2632                                   !atomic_read(&exp->exp_obd->
2633                                                    obd_evict_inprogress),
2634                                   lwi);
2635         }
2636
2637         /* Check if client was evicted or reconnected already. */
2638         if (exp->exp_failed ||
2639             exp->exp_conn_cnt > lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
2640                 rc = -ENOTCONN;
2641         } else {
2642                 if (desc->bd_type == BULK_PUT_SINK)
2643                         rc = sptlrpc_svc_wrap_bulk(req, desc);
2644                 if (rc == 0)
2645                         rc = ptlrpc_start_bulk_transfer(desc);
2646         }
2647
2648         if (rc < 0) {
2649                 DEBUG_REQ(D_ERROR, req, "bulk %s failed: rc %d",
2650                           bulk2type(desc), rc);
2651                 RETURN(rc);
2652         }
2653
2654         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_SENDPAGE)) {
2655                 ptlrpc_abort_bulk(desc);
2656                 RETURN(0);
2657         }
2658
2659         /* limit actual bulk transfer to bulk_timeout seconds */
2660         deadline = start + bulk_timeout;
2661         if (deadline > req->rq_deadline)
2662                 deadline = req->rq_deadline;
2663
2664         do {
2665                 long timeoutl = deadline - cfs_time_current_sec();
2666                 cfs_duration_t timeout = timeoutl <= 0 ?
2667                                          CFS_TICK : cfs_time_seconds(timeoutl);
2668
2669                 *lwi = LWI_TIMEOUT_INTERVAL(timeout, cfs_time_seconds(1),
2670                                             target_bulk_timeout, desc);
2671                 rc = l_wait_event(desc->bd_waitq,
2672                                   !ptlrpc_server_bulk_active(desc) ||
2673                                   exp->exp_failed ||
2674                                   exp->exp_conn_cnt >
2675                                   lustre_msg_get_conn_cnt(req->rq_reqmsg),
2676                                   lwi);
2677                 LASSERT(rc == 0 || rc == -ETIMEDOUT);
2678                 /* Wait again if we changed rq_deadline. */
2679                 deadline = start + bulk_timeout;
2680                 if (deadline > req->rq_deadline)
2681                         deadline = req->rq_deadline;
2682         } while ((rc == -ETIMEDOUT) &&
2683                  (deadline > cfs_time_current_sec()));
2684
2685         if (rc == -ETIMEDOUT) {
2686                 DEBUG_REQ(D_ERROR, req, "timeout on bulk %s after %ld%+lds",
2687                           bulk2type(desc), deadline - start,
2688                           cfs_time_current_sec() - deadline);
2689                 ptlrpc_abort_bulk(desc);
2690         } else if (exp->exp_failed) {
2691                 DEBUG_REQ(D_ERROR, req, "Eviction on bulk %s",
2692                           bulk2type(desc));
2693                 rc = -ENOTCONN;
2694                 ptlrpc_abort_bulk(desc);
2695         } else if (exp->exp_conn_cnt >
2696                    lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
2697                 DEBUG_REQ(D_ERROR, req, "Reconnect on bulk %s",
2698                           bulk2type(desc));
2699                 /* We don't reply anyway. */
2700                 rc = -ETIMEDOUT;
2701                 ptlrpc_abort_bulk(desc);
2702         } else if (desc->bd_failure ||
2703                    desc->bd_nob_transferred != desc->bd_nob) {
2704                 DEBUG_REQ(D_ERROR, req, "%s bulk %s %d(%d)",
2705                           desc->bd_failure ? "network error on" : "truncated",
2706                           bulk2type(desc), desc->bd_nob_transferred,
2707                           desc->bd_nob);
2708                 /* XXX Should this be a different errno? */
2709                 rc = -ETIMEDOUT;
2710         } else if (desc->bd_type == BULK_GET_SINK) {
2711                 rc = sptlrpc_svc_unwrap_bulk(req, desc);
2712         }
2713
2714         RETURN(rc);
2715 }
2716 EXPORT_SYMBOL(target_bulk_io);
2717
2718 #endif /* HAVE_SERVER_SUPPORT */