drivers/staging/lustre/lustre/ldlm/ldlm_lib.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2010, 2015, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 /**
  34  * This file deals with various client/target related logic including recovery.
  35  *
  36  * TODO: This code more logically belongs in the ptlrpc module than in ldlm and
  37  * should be moved.
  38  */
  39
  40 #define DEBUG_SUBSYSTEM S_LDLM
  41
  42 #include "../../include/linux/libcfs/libcfs.h"
  43 #include "../include/obd.h"
  44 #include "../include/obd_class.h"
  45 #include "../include/lustre_dlm.h"
  46 #include "../include/lustre_net.h"
  47 #include "../include/lustre_sec.h"
  48 #include "ldlm_internal.h"
  49
  50 /* @priority: If non-zero, move the selected connection to the list head.
  51  * @create: If zero, only search in existing connections.
  52  */
  53 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  54                            int priority, int create)
  55 {
  56         struct ptlrpc_connection *ptlrpc_conn;
  57         struct obd_import_conn *imp_conn = NULL, *item;
  58         int rc = 0;
  59
  60         if (!create && !priority) {
  61                 CDEBUG(D_HA, "Nothing to do\n");
  62                 return -EINVAL;
  63         }
  64
  65         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
  66         if (!ptlrpc_conn) {
  67                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  68                 return -ENOENT;
  69         }
  70
  71         if (create) {
  72                 imp_conn = kzalloc(sizeof(*imp_conn), GFP_NOFS);
  73                 if (!imp_conn) {
  74                         rc = -ENOMEM;
  75                         goto out_put;
  76                 }
  77         }
  78
  79         spin_lock(&imp->imp_lock);
  80         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  81                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  82                         if (priority) {
  83                                 list_del(&item->oic_item);
  84                                 list_add(&item->oic_item,
  85                                          &imp->imp_conn_list);
  86                                 item->oic_last_attempt = 0;
  87                         }
  88                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  89                                imp, imp->imp_obd->obd_name, uuid->uuid,
  90                                (priority ? ", moved to head" : ""));
  91                         spin_unlock(&imp->imp_lock);
  92                         rc = 0;
  93                         goto out_free;
  94                 }
  95         }
  96         /* No existing import connection found for \a uuid. */
  97         if (create) {
  98                 imp_conn->oic_conn = ptlrpc_conn;
  99                 imp_conn->oic_uuid = *uuid;
 100                 imp_conn->oic_last_attempt = 0;
 101                 if (priority)
 102                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 103                 else
 104                         list_add_tail(&imp_conn->oic_item,
 105                                       &imp->imp_conn_list);
 106                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 107                        imp, imp->imp_obd->obd_name, uuid->uuid,
 108                        (priority ? "head" : "tail"));
 109         } else {
 110                 spin_unlock(&imp->imp_lock);
 111                 rc = -ENOENT;
 112                 goto out_free;
 113         }
 114
 115         spin_unlock(&imp->imp_lock);
 116         return 0;
 117 out_free:
 118         kfree(imp_conn);
 119 out_put:
 120         ptlrpc_connection_put(ptlrpc_conn);
 121         return rc;
 122 }
 123
 124 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 125 {
 126         return import_set_conn(imp, uuid, 1, 0);
 127 }
 128
 129 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 130                            int priority)
 131 {
 132         return import_set_conn(imp, uuid, priority, 1);
 133 }
 134 EXPORT_SYMBOL(client_import_add_conn);
 135
 136 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 137 {
 138         struct obd_import_conn *imp_conn;
 139         struct obd_export *dlmexp;
 140         int rc = -ENOENT;
 141
 142         spin_lock(&imp->imp_lock);
 143         if (list_empty(&imp->imp_conn_list)) {
 144                 LASSERT(!imp->imp_connection);
 145                 goto out;
 146         }
 147
 148         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 149                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 150                         continue;
 151                 LASSERT(imp_conn->oic_conn);
 152
 153                 if (imp_conn == imp->imp_conn_current) {
 154                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 155
 156                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 157                             imp->imp_state != LUSTRE_IMP_DISCON) {
 158                                 CERROR("can't remove current connection\n");
 159                                 rc = -EBUSY;
 160                                 goto out;
 161                         }
 162
 163                         ptlrpc_connection_put(imp->imp_connection);
 164                         imp->imp_connection = NULL;
 165
 166                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 167                         if (dlmexp && dlmexp->exp_connection) {
 168                                 LASSERT(dlmexp->exp_connection ==
 169                                         imp_conn->oic_conn);
 170                                 ptlrpc_connection_put(dlmexp->exp_connection);
 171                                 dlmexp->exp_connection = NULL;
 172                         }
 173                 }
 174
 175                 list_del(&imp_conn->oic_item);
 176                 ptlrpc_connection_put(imp_conn->oic_conn);
 177                 kfree(imp_conn);
 178                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 179                        imp, imp->imp_obd->obd_name, uuid->uuid);
 180                 rc = 0;
 181                 break;
 182         }
 183 out:
 184         spin_unlock(&imp->imp_lock);
 185         if (rc == -ENOENT)
 186                 CERROR("connection %s not found\n", uuid->uuid);
 187         return rc;
 188 }
 189 EXPORT_SYMBOL(client_import_del_conn);
 190
 191 /**
 192  * Find conn UUID by peer NID. \a peer is a server NID. This function is used
 193  * to find a conn uuid of \a imp which can reach \a peer.
 194  */
 195 int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
 196                             struct obd_uuid *uuid)
 197 {
 198         struct obd_import_conn *conn;
 199         int rc = -ENOENT;
 200
 201         spin_lock(&imp->imp_lock);
 202         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 203                 /* Check if conn UUID does have this peer NID. */
 204                 if (class_check_uuid(&conn->oic_uuid, peer)) {
 205                         *uuid = conn->oic_uuid;
 206                         rc = 0;
 207                         break;
 208                 }
 209         }
 210         spin_unlock(&imp->imp_lock);
 211         return rc;
 212 }
 213 EXPORT_SYMBOL(client_import_find_conn);
 214
 215 void client_destroy_import(struct obd_import *imp)
 216 {
 217         /* Drop security policy instance after all RPCs have finished/aborted
 218          * to let all busy contexts be released.
 219          */
 220         class_import_get(imp);
 221         class_destroy_import(imp);
 222         sptlrpc_import_sec_put(imp);
 223         class_import_put(imp);
 224 }
 225 EXPORT_SYMBOL(client_destroy_import);
 226
 227 /* Configure an RPC client OBD device.
 228  *
 229  * lcfg parameters:
 230  * 1 - client UUID
 231  * 2 - server UUID
 232  * 3 - inactive-on-startup
 233  */
 234 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 235 {
 236         struct client_obd *cli = &obddev->u.cli;
 237         struct obd_import *imp;
 238         struct obd_uuid server_uuid;
 239         int rq_portal, rp_portal, connect_op;
 240         char *name = obddev->obd_type->typ_name;
 241         enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
 242         int rc;
 243
 244         /* In a more perfect world, we would hang a ptlrpc_client off of
 245          * obd_type and just use the values from there.
 246          */
 247         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 248                 rq_portal = OST_REQUEST_PORTAL;
 249                 rp_portal = OSC_REPLY_PORTAL;
 250                 connect_op = OST_CONNECT;
 251                 cli->cl_sp_me = LUSTRE_SP_CLI;
 252                 cli->cl_sp_to = LUSTRE_SP_OST;
 253                 ns_type = LDLM_NS_TYPE_OSC;
 254         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
 255                    !strcmp(name, LUSTRE_LWP_NAME)) {
 256                 rq_portal = MDS_REQUEST_PORTAL;
 257                 rp_portal = MDC_REPLY_PORTAL;
 258                 connect_op = MDS_CONNECT;
 259                 cli->cl_sp_me = LUSTRE_SP_CLI;
 260                 cli->cl_sp_to = LUSTRE_SP_MDT;
 261                 ns_type = LDLM_NS_TYPE_MDC;
 262         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 263                 rq_portal = MGS_REQUEST_PORTAL;
 264                 rp_portal = MGC_REPLY_PORTAL;
 265                 connect_op = MGS_CONNECT;
 266                 cli->cl_sp_me = LUSTRE_SP_MGC;
 267                 cli->cl_sp_to = LUSTRE_SP_MGS;
 268                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 269                 ns_type = LDLM_NS_TYPE_MGC;
 270         } else {
 271                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 272                        name);
 273                 return -EINVAL;
 274         }
 275
 276         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 277                 CERROR("requires a TARGET UUID\n");
 278                 return -EINVAL;
 279         }
 280
 281         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 282                 CERROR("client UUID must be less than 38 characters\n");
 283                 return -EINVAL;
 284         }
 285
 286         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 287                 CERROR("setup requires a SERVER UUID\n");
 288                 return -EINVAL;
 289         }
 290
 291         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 292                 CERROR("target UUID must be less than 38 characters\n");
 293                 return -EINVAL;
 294         }
 295
 296         init_rwsem(&cli->cl_sem);
 297         cli->cl_conn_count = 0;
 298         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 299                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 300                      sizeof(server_uuid)));
 301
 302         cli->cl_dirty_pages = 0;
 303         cli->cl_avail_grant = 0;
 304         /* FIXME: Should limit this for the sum of all cl_dirty_max_pages. */
 305         /*
 306          * cl_dirty_max_pages may be changed at connect time in
 307          * ptlrpc_connect_interpret().
 308          */
 309         client_adjust_max_dirty(cli);
 310         INIT_LIST_HEAD(&cli->cl_cache_waiters);
 311         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 312         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 313         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 314         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 315         spin_lock_init(&cli->cl_loi_list_lock);
 316         atomic_set(&cli->cl_pending_w_pages, 0);
 317         atomic_set(&cli->cl_pending_r_pages, 0);
 318         cli->cl_r_in_flight = 0;
 319         cli->cl_w_in_flight = 0;
 320
 321         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 322         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 323         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 324         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 325         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 326         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 327
 328         /* lru for osc. */
 329         INIT_LIST_HEAD(&cli->cl_lru_osc);
 330         atomic_set(&cli->cl_lru_shrinkers, 0);
 331         atomic_long_set(&cli->cl_lru_busy, 0);
 332         atomic_long_set(&cli->cl_lru_in_list, 0);
 333         INIT_LIST_HEAD(&cli->cl_lru_list);
 334         spin_lock_init(&cli->cl_lru_list_lock);
 335         atomic_long_set(&cli->cl_unstable_count, 0);
 336
 337         init_waitqueue_head(&cli->cl_destroy_waitq);
 338         atomic_set(&cli->cl_destroy_in_flight, 0);
 339         /* Turn on checksumming by default. */
 340         cli->cl_checksum = 1;
 341         /*
 342          * The supported checksum types will be worked out at connect time
 343          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 344          * through procfs.
 345          */
 346         cli->cl_cksum_type = OBD_CKSUM_CRC32;
 347         cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 348         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 349
 350         /* This value may be reduced at connect time in
 351          * ptlrpc_connect_interpret() . We initialize it to only
 352          * 1MB until we know what the performance looks like.
 353          * In the future this should likely be increased. LU-1431
 354          */
 355         cli->cl_max_pages_per_rpc = min_t(int, PTLRPC_MAX_BRW_PAGES,
 356                                           LNET_MTU >> PAGE_SHIFT);
 357
 358         /*
 359          * set cl_chunkbits default value to PAGE_CACHE_SHIFT,
 360          * it will be updated at OSC connection time.
 361          */
 362         cli->cl_chunkbits = PAGE_SHIFT;
 363
 364         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 365                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 366         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
 367                 cli->cl_max_rpcs_in_flight = 2;
 368         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
 369                 cli->cl_max_rpcs_in_flight = 3;
 370         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
 371                 cli->cl_max_rpcs_in_flight = 4;
 372         } else {
 373                 cli->cl_max_rpcs_in_flight = OBD_MAX_RIF_DEFAULT;
 374         }
 375         rc = ldlm_get_ref();
 376         if (rc) {
 377                 CERROR("ldlm_get_ref failed: %d\n", rc);
 378                 goto err;
 379         }
 380
 381         ptlrpc_init_client(rq_portal, rp_portal, name,
 382                            &obddev->obd_ldlm_client);
 383
 384         imp = class_new_import(obddev);
 385         if (!imp) {
 386                 rc = -ENOENT;
 387                 goto err_ldlm;
 388         }
 389         imp->imp_client = &obddev->obd_ldlm_client;
 390         imp->imp_connect_op = connect_op;
 391         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 392                LUSTRE_CFG_BUFLEN(lcfg, 1));
 393         class_import_put(imp);
 394
 395         rc = client_import_add_conn(imp, &server_uuid, 1);
 396         if (rc) {
 397                 CERROR("can't add initial connection\n");
 398                 goto err_import;
 399         }
 400
 401         cli->cl_import = imp;
 402         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 403         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 404         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 405
 406         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 407                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 408                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 409                                name, obddev->obd_name,
 410                                cli->cl_target_uuid.uuid);
 411                         spin_lock(&imp->imp_lock);
 412                         imp->imp_deactive = 1;
 413                         spin_unlock(&imp->imp_lock);
 414                 }
 415         }
 416
 417         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 418                                                    LDLM_NAMESPACE_CLIENT,
 419                                                    LDLM_NAMESPACE_GREEDY,
 420                                                    ns_type);
 421         if (!obddev->obd_namespace) {
 422                 CERROR("Unable to create client namespace - %s\n",
 423                        obddev->obd_name);
 424                 rc = -ENOMEM;
 425                 goto err_import;
 426         }
 427
 428         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 429
 430         return rc;
 431
 432 err_import:
 433         class_destroy_import(imp);
 434 err_ldlm:
 435         ldlm_put_ref();
 436 err:
 437         return rc;
 438 }
 439 EXPORT_SYMBOL(client_obd_setup);
 440
 441 int client_obd_cleanup(struct obd_device *obddev)
 442 {
 443         ldlm_namespace_free_post(obddev->obd_namespace);
 444         obddev->obd_namespace = NULL;
 445
 446         obd_cleanup_client_import(obddev);
 447         LASSERT(!obddev->u.cli.cl_import);
 448
 449         ldlm_put_ref();
 450         return 0;
 451 }
 452 EXPORT_SYMBOL(client_obd_cleanup);
 453
 454 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 455 int client_connect_import(const struct lu_env *env,
 456                           struct obd_export **exp,
 457                           struct obd_device *obd, struct obd_uuid *cluuid,
 458                           struct obd_connect_data *data, void *localdata)
 459 {
 460         struct client_obd       *cli    = &obd->u.cli;
 461         struct obd_import       *imp    = cli->cl_import;
 462         struct obd_connect_data *ocd;
 463         struct lustre_handle    conn    = { 0 };
 464         int                  rc;
 465
 466         *exp = NULL;
 467         down_write(&cli->cl_sem);
 468         if (cli->cl_conn_count > 0) {
 469                 rc = -EALREADY;
 470                 goto out_sem;
 471         }
 472
 473         rc = class_connect(&conn, obd, cluuid);
 474         if (rc)
 475                 goto out_sem;
 476
 477         cli->cl_conn_count++;
 478         *exp = class_conn2export(&conn);
 479
 480         LASSERT(obd->obd_namespace);
 481
 482         imp->imp_dlm_handle = conn;
 483         rc = ptlrpc_init_import(imp);
 484         if (rc != 0)
 485                 goto out_ldlm;
 486
 487         ocd = &imp->imp_connect_data;
 488         if (data) {
 489                 *ocd = *data;
 490                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 491         }
 492
 493         rc = ptlrpc_connect_import(imp);
 494         if (rc != 0) {
 495                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 496                 goto out_ldlm;
 497         }
 498         LASSERT(*exp && (*exp)->exp_connection);
 499
 500         if (data) {
 501                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 502                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 503                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 504                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 505         }
 506
 507         ptlrpc_pinger_add_import(imp);
 508
 509         if (rc) {
 510 out_ldlm:
 511                 cli->cl_conn_count--;
 512                 class_disconnect(*exp);
 513                 *exp = NULL;
 514         }
 515 out_sem:
 516         up_write(&cli->cl_sem);
 517
 518         return rc;
 519 }
 520 EXPORT_SYMBOL(client_connect_import);
 521
 522 int client_disconnect_export(struct obd_export *exp)
 523 {
 524         struct obd_device *obd = class_exp2obd(exp);
 525         struct client_obd *cli;
 526         struct obd_import *imp;
 527         int rc = 0, err;
 528
 529         if (!obd) {
 530                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 531                        exp, exp ? exp->exp_handle.h_cookie : -1);
 532                 return -EINVAL;
 533         }
 534
 535         cli = &obd->u.cli;
 536         imp = cli->cl_import;
 537
 538         down_write(&cli->cl_sem);
 539         CDEBUG(D_INFO, "disconnect %s - %zu\n", obd->obd_name,
 540                cli->cl_conn_count);
 541
 542         if (!cli->cl_conn_count) {
 543                 CERROR("disconnecting disconnected device (%s)\n",
 544                        obd->obd_name);
 545                 rc = -EINVAL;
 546                 goto out_disconnect;
 547         }
 548
 549         cli->cl_conn_count--;
 550         if (cli->cl_conn_count) {
 551                 rc = 0;
 552                 goto out_disconnect;
 553         }
 554
 555         /* Mark import deactivated now, so we don't try to reconnect if any
 556          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 557          * fully deactivate the import, or that would drop all requests.
 558          */
 559         spin_lock(&imp->imp_lock);
 560         imp->imp_deactive = 1;
 561         spin_unlock(&imp->imp_lock);
 562
 563         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 564          * delete it regardless.  (It's safe to delete an import that was
 565          * never added.)
 566          */
 567         (void)ptlrpc_pinger_del_import(imp);
 568
 569         if (obd->obd_namespace) {
 570                 /* obd_force == local only */
 571                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 572                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 573                 ldlm_namespace_free_prior(obd->obd_namespace, imp,
 574                                           obd->obd_force);
 575         }
 576
 577         /* There's no need to hold sem while disconnecting an import,
 578          * and it may actually cause deadlock in GSS.
 579          */
 580         up_write(&cli->cl_sem);
 581         rc = ptlrpc_disconnect_import(imp, 0);
 582         down_write(&cli->cl_sem);
 583
 584         ptlrpc_invalidate_import(imp);
 585
 586 out_disconnect:
 587         /* Use server style - class_disconnect should be always called for
 588          * o_disconnect.
 589          */
 590         err = class_disconnect(exp);
 591         if (!rc && err)
 592                 rc = err;
 593
 594         up_write(&cli->cl_sem);
 595
 596         return rc;
 597 }
 598 EXPORT_SYMBOL(client_disconnect_export);
 599
 600 /**
 601  * Packs current SLV and Limit into \a req.
 602  */
 603 int target_pack_pool_reply(struct ptlrpc_request *req)
 604 {
 605         struct obd_device *obd;
 606
 607         /* Check that we still have all structures alive as this may
 608          * be some late RPC at shutdown time.
 609          */
 610         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
 611                      !exp_connect_lru_resize(req->rq_export))) {
 612                 lustre_msg_set_slv(req->rq_repmsg, 0);
 613                 lustre_msg_set_limit(req->rq_repmsg, 0);
 614                 return 0;
 615         }
 616
 617         /* OBD is alive here as export is alive, which we checked above. */
 618         obd = req->rq_export->exp_obd;
 619
 620         read_lock(&obd->obd_pool_lock);
 621         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
 622         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
 623         read_unlock(&obd->obd_pool_lock);
 624
 625         return 0;
 626 }
 627 EXPORT_SYMBOL(target_pack_pool_reply);
 628
 629 static int
 630 target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
 631 {
 632         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
 633                 DEBUG_REQ(D_ERROR, req, "dropping reply");
 634                 return -ECOMM;
 635         }
 636
 637         if (unlikely(rc)) {
 638                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
 639                 req->rq_status = rc;
 640                 return ptlrpc_send_error(req, 1);
 641         }
 642
 643         DEBUG_REQ(D_NET, req, "sending reply");
 644         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
 645 }
 646
 647 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
 648 {
 649         struct ptlrpc_service_part *svcpt;
 650         int                     netrc;
 651         struct ptlrpc_reply_state *rs;
 652         struct obd_export        *exp;
 653
 654         if (req->rq_no_reply)
 655                 return;
 656
 657         svcpt = req->rq_rqbd->rqbd_svcpt;
 658         rs = req->rq_reply_state;
 659         if (!rs || !rs->rs_difficult) {
 660                 /* no notifiers */
 661                 target_send_reply_msg(req, rc, fail_id);
 662                 return;
 663         }
 664
 665         /* must be an export if locks saved */
 666         LASSERT(req->rq_export);
 667         /* req/reply consistent */
 668         LASSERT(rs->rs_svcpt == svcpt);
 669
 670         /* "fresh" reply */
 671         LASSERT(!rs->rs_scheduled);
 672         LASSERT(!rs->rs_scheduled_ever);
 673         LASSERT(!rs->rs_handled);
 674         LASSERT(!rs->rs_on_net);
 675         LASSERT(!rs->rs_export);
 676         LASSERT(list_empty(&rs->rs_obd_list));
 677         LASSERT(list_empty(&rs->rs_exp_list));
 678
 679         exp = class_export_get(req->rq_export);
 680
 681         /* disable reply scheduling while I'm setting up */
 682         rs->rs_scheduled = 1;
 683         rs->rs_on_net    = 1;
 684         rs->rs_xid       = req->rq_xid;
 685         rs->rs_transno   = req->rq_transno;
 686         rs->rs_export    = exp;
 687         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
 688
 689         spin_lock(&exp->exp_uncommitted_replies_lock);
 690         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
 691                rs->rs_transno, exp->exp_last_committed);
 692         if (rs->rs_transno > exp->exp_last_committed) {
 693                 /* not committed already */
 694                 list_add_tail(&rs->rs_obd_list,
 695                               &exp->exp_uncommitted_replies);
 696         }
 697         spin_unlock(&exp->exp_uncommitted_replies_lock);
 698
 699         spin_lock(&exp->exp_lock);
 700         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
 701         spin_unlock(&exp->exp_lock);
 702
 703         netrc = target_send_reply_msg(req, rc, fail_id);
 704
 705         spin_lock(&svcpt->scp_rep_lock);
 706
 707         atomic_inc(&svcpt->scp_nreps_difficult);
 708
 709         if (netrc != 0) {
 710                 /* error sending: reply is off the net.  Also we need +1
 711                  * reply ref until ptlrpc_handle_rs() is done
 712                  * with the reply state (if the send was successful, there
 713                  * would have been +1 ref for the net, which
 714                  * reply_out_callback leaves alone)
 715                  */
 716                 rs->rs_on_net = 0;
 717                 ptlrpc_rs_addref(rs);
 718         }
 719
 720         spin_lock(&rs->rs_lock);
 721         if (rs->rs_transno <= exp->exp_last_committed ||
 722             (!rs->rs_on_net && !rs->rs_no_ack) ||
 723             list_empty(&rs->rs_exp_list) ||     /* completed already */
 724             list_empty(&rs->rs_obd_list)) {
 725                 CDEBUG(D_HA, "Schedule reply immediately\n");
 726                 ptlrpc_dispatch_difficult_reply(rs);
 727         } else {
 728                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
 729                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
 730         }
 731         spin_unlock(&rs->rs_lock);
 732         spin_unlock(&svcpt->scp_rep_lock);
 733 }
 734 EXPORT_SYMBOL(target_send_reply);
 735
 736 enum ldlm_mode lck_compat_array[] = {
 737         [LCK_EX]        = LCK_COMPAT_EX,
 738         [LCK_PW]        = LCK_COMPAT_PW,
 739         [LCK_PR]        = LCK_COMPAT_PR,
 740         [LCK_CW]        = LCK_COMPAT_CW,
 741         [LCK_CR]        = LCK_COMPAT_CR,
 742         [LCK_NL]        = LCK_COMPAT_NL,
 743         [LCK_GROUP]     = LCK_COMPAT_GROUP,
 744         [LCK_COS]       = LCK_COMPAT_COS,
 745 };
 746
 747 /**
 748  * Rather arbitrary mapping from LDLM error codes to errno values. This should
 749  * not escape to the user level.
 750  */
 751 int ldlm_error2errno(enum ldlm_error error)
 752 {
 753         int result;
 754
 755         switch (error) {
 756         case ELDLM_OK:
 757         case ELDLM_LOCK_MATCHED:
 758                 result = 0;
 759                 break;
 760         case ELDLM_LOCK_CHANGED:
 761                 result = -ESTALE;
 762                 break;
 763         case ELDLM_LOCK_ABORTED:
 764                 result = -ENAVAIL;
 765                 break;
 766         case ELDLM_LOCK_REPLACED:
 767                 result = -ESRCH;
 768                 break;
 769         case ELDLM_NO_LOCK_DATA:
 770                 result = -ENOENT;
 771                 break;
 772         case ELDLM_NAMESPACE_EXISTS:
 773                 result = -EEXIST;
 774                 break;
 775         case ELDLM_BAD_NAMESPACE:
 776                 result = -EBADF;
 777                 break;
 778         default:
 779                 if (((int)error) < 0)  /* cast to signed type */
 780                         result = error; /* as enum ldlm_error can be unsigned */
 781                 else {
 782                         CERROR("Invalid DLM result code: %d\n", error);
 783                         result = -EPROTO;
 784                 }
 785         }
 786         return result;
 787 }
 788 EXPORT_SYMBOL(ldlm_error2errno);
 789
 790 #if LUSTRE_TRACKS_LOCK_EXP_REFS
 791 void ldlm_dump_export_locks(struct obd_export *exp)
 792 {
 793         spin_lock(&exp->exp_locks_list_guard);
 794         if (!list_empty(&exp->exp_locks_list)) {
 795                 struct ldlm_lock *lock;
 796
 797                 CERROR("dumping locks for export %p,ignore if the unmount doesn't hang\n",
 798                        exp);
 799                 list_for_each_entry(lock, &exp->exp_locks_list,
 800                                     l_exp_refs_link)
 801                         LDLM_ERROR(lock, "lock:");
 802         }
 803         spin_unlock(&exp->exp_locks_list_guard);
 804 }
 805 #endif