kernel/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.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, 2012, 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 "../../include/linux/libcfs/libcfs.h"
  47 #include "../include/obd.h"
  48 #include "../include/obd_class.h"
  49 #include "../include/lustre_dlm.h"
  50 #include "../include/lustre_net.h"
  51 #include "../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
  64         if (!create && !priority) {
  65                 CDEBUG(D_HA, "Nothing to do\n");
  66                 return -EINVAL;
  67         }
  68
  69         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
  70         if (!ptlrpc_conn) {
  71                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  72                 return -ENOENT;
  73         }
  74
  75         if (create) {
  76                 imp_conn = kzalloc(sizeof(*imp_conn), GFP_NOFS);
  77                 if (!imp_conn) {
  78                         rc = -ENOMEM;
  79                         goto out_put;
  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                         rc = 0;
  97                         goto out_free;
  98                 }
  99         }
 100         /* No existing import connection found for \a uuid. */
 101         if (create) {
 102                 imp_conn->oic_conn = ptlrpc_conn;
 103                 imp_conn->oic_uuid = *uuid;
 104                 imp_conn->oic_last_attempt = 0;
 105                 if (priority)
 106                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 107                 else
 108                         list_add_tail(&imp_conn->oic_item,
 109                                           &imp->imp_conn_list);
 110                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 111                        imp, imp->imp_obd->obd_name, uuid->uuid,
 112                        (priority ? "head" : "tail"));
 113         } else {
 114                 spin_unlock(&imp->imp_lock);
 115                 rc = -ENOENT;
 116                 goto out_free;
 117         }
 118
 119         spin_unlock(&imp->imp_lock);
 120         return 0;
 121 out_free:
 122         kfree(imp_conn);
 123 out_put:
 124         ptlrpc_connection_put(ptlrpc_conn);
 125         return rc;
 126 }
 127
 128 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 129 {
 130         return import_set_conn(imp, uuid, 1, 0);
 131 }
 132
 133 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 134                            int priority)
 135 {
 136         return import_set_conn(imp, uuid, priority, 1);
 137 }
 138 EXPORT_SYMBOL(client_import_add_conn);
 139
 140 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 141 {
 142         struct obd_import_conn *imp_conn;
 143         struct obd_export *dlmexp;
 144         int rc = -ENOENT;
 145
 146         spin_lock(&imp->imp_lock);
 147         if (list_empty(&imp->imp_conn_list)) {
 148                 LASSERT(!imp->imp_connection);
 149                 goto out;
 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                                 rc = -EBUSY;
 164                                 goto out;
 165                         }
 166
 167                         ptlrpc_connection_put(imp->imp_connection);
 168                         imp->imp_connection = NULL;
 169
 170                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 171                         if (dlmexp && dlmexp->exp_connection) {
 172                                 LASSERT(dlmexp->exp_connection ==
 173                                         imp_conn->oic_conn);
 174                                 ptlrpc_connection_put(dlmexp->exp_connection);
 175                                 dlmexp->exp_connection = NULL;
 176                         }
 177                 }
 178
 179                 list_del(&imp_conn->oic_item);
 180                 ptlrpc_connection_put(imp_conn->oic_conn);
 181                 kfree(imp_conn);
 182                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 183                        imp, imp->imp_obd->obd_name, uuid->uuid);
 184                 rc = 0;
 185                 break;
 186         }
 187 out:
 188         spin_unlock(&imp->imp_lock);
 189         if (rc == -ENOENT)
 190                 CERROR("connection %s not found\n", uuid->uuid);
 191         return rc;
 192 }
 193 EXPORT_SYMBOL(client_import_del_conn);
 194
 195 /**
 196  * Find conn UUID by peer NID. \a peer is a server NID. This function is used
 197  * to find a conn uuid of \a imp which can reach \a peer.
 198  */
 199 int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
 200                             struct obd_uuid *uuid)
 201 {
 202         struct obd_import_conn *conn;
 203         int rc = -ENOENT;
 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
 270         /* In a more perfect world, we would hang a ptlrpc_client off of
 271          * obd_type and just use the values from there. */
 272         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 273                 rq_portal = OST_REQUEST_PORTAL;
 274                 rp_portal = OSC_REPLY_PORTAL;
 275                 connect_op = OST_CONNECT;
 276                 cli->cl_sp_me = LUSTRE_SP_CLI;
 277                 cli->cl_sp_to = LUSTRE_SP_OST;
 278                 ns_type = LDLM_NS_TYPE_OSC;
 279         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
 280                    !strcmp(name, LUSTRE_LWP_NAME)) {
 281                 rq_portal = MDS_REQUEST_PORTAL;
 282                 rp_portal = MDC_REPLY_PORTAL;
 283                 connect_op = MDS_CONNECT;
 284                 cli->cl_sp_me = LUSTRE_SP_CLI;
 285                 cli->cl_sp_to = LUSTRE_SP_MDT;
 286                 ns_type = LDLM_NS_TYPE_MDC;
 287         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
 288                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
 289                         /* OSP_on_MDT for other MDTs */
 290                         connect_op = MDS_CONNECT;
 291                         cli->cl_sp_to = LUSTRE_SP_MDT;
 292                         ns_type = LDLM_NS_TYPE_MDC;
 293                         rq_portal = OUT_PORTAL;
 294                 } else {
 295                         /* OSP on MDT for OST */
 296                         connect_op = OST_CONNECT;
 297                         cli->cl_sp_to = LUSTRE_SP_OST;
 298                         ns_type = LDLM_NS_TYPE_OSC;
 299                         rq_portal = OST_REQUEST_PORTAL;
 300                 }
 301                 rp_portal = OSC_REPLY_PORTAL;
 302                 cli->cl_sp_me = LUSTRE_SP_CLI;
 303         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 304                 rq_portal = MGS_REQUEST_PORTAL;
 305                 rp_portal = MGC_REPLY_PORTAL;
 306                 connect_op = MGS_CONNECT;
 307                 cli->cl_sp_me = LUSTRE_SP_MGC;
 308                 cli->cl_sp_to = LUSTRE_SP_MGS;
 309                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 310                 ns_type = LDLM_NS_TYPE_MGC;
 311         } else {
 312                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 313                        name);
 314                 return -EINVAL;
 315         }
 316
 317         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 318                 CERROR("requires a TARGET UUID\n");
 319                 return -EINVAL;
 320         }
 321
 322         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 323                 CERROR("client UUID must be less than 38 characters\n");
 324                 return -EINVAL;
 325         }
 326
 327         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 328                 CERROR("setup requires a SERVER UUID\n");
 329                 return -EINVAL;
 330         }
 331
 332         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 333                 CERROR("target UUID must be less than 38 characters\n");
 334                 return -EINVAL;
 335         }
 336
 337         init_rwsem(&cli->cl_sem);
 338         cli->cl_conn_count = 0;
 339         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 340                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 341                      sizeof(server_uuid)));
 342
 343         cli->cl_dirty = 0;
 344         cli->cl_avail_grant = 0;
 345         /* FIXME: Should limit this for the sum of all cl_dirty_max. */
 346         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 347         if (cli->cl_dirty_max >> PAGE_CACHE_SHIFT > totalram_pages / 8)
 348                 cli->cl_dirty_max = totalram_pages << (PAGE_CACHE_SHIFT - 3);
 349         INIT_LIST_HEAD(&cli->cl_cache_waiters);
 350         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 351         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 352         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 353         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 354         client_obd_list_lock_init(&cli->cl_loi_list_lock);
 355         atomic_set(&cli->cl_pending_w_pages, 0);
 356         atomic_set(&cli->cl_pending_r_pages, 0);
 357         cli->cl_r_in_flight = 0;
 358         cli->cl_w_in_flight = 0;
 359
 360         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 361         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 362         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 363         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 364         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 365         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 366
 367         /* lru for osc. */
 368         INIT_LIST_HEAD(&cli->cl_lru_osc);
 369         atomic_set(&cli->cl_lru_shrinkers, 0);
 370         atomic_set(&cli->cl_lru_busy, 0);
 371         atomic_set(&cli->cl_lru_in_list, 0);
 372         INIT_LIST_HEAD(&cli->cl_lru_list);
 373         client_obd_list_lock_init(&cli->cl_lru_list_lock);
 374
 375         init_waitqueue_head(&cli->cl_destroy_waitq);
 376         atomic_set(&cli->cl_destroy_in_flight, 0);
 377         /* Turn on checksumming by default. */
 378         cli->cl_checksum = 1;
 379         /*
 380          * The supported checksum types will be worked out at connect time
 381          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 382          * through procfs.
 383          */
 384         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 385         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 386
 387         /* This value may be reduced at connect time in
 388          * ptlrpc_connect_interpret() . We initialize it to only
 389          * 1MB until we know what the performance looks like.
 390          * In the future this should likely be increased. LU-1431 */
 391         cli->cl_max_pages_per_rpc = min_t(int, PTLRPC_MAX_BRW_PAGES,
 392                                           LNET_MTU >> PAGE_CACHE_SHIFT);
 393
 394         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 395                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
 396         } else if (totalram_pages >> (20 - PAGE_CACHE_SHIFT) <= 128 /* MB */) {
 397                 cli->cl_max_rpcs_in_flight = 2;
 398         } else if (totalram_pages >> (20 - PAGE_CACHE_SHIFT) <= 256 /* MB */) {
 399                 cli->cl_max_rpcs_in_flight = 3;
 400         } else if (totalram_pages >> (20 - PAGE_CACHE_SHIFT) <= 512 /* MB */) {
 401                 cli->cl_max_rpcs_in_flight = 4;
 402         } else {
 403                 if (osc_on_mdt(obddev->obd_name))
 404                         cli->cl_max_rpcs_in_flight = MDS_OSC_MAX_RIF_DEFAULT;
 405                 else
 406                         cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 407         }
 408         rc = ldlm_get_ref();
 409         if (rc) {
 410                 CERROR("ldlm_get_ref failed: %d\n", rc);
 411                 goto err;
 412         }
 413
 414         ptlrpc_init_client(rq_portal, rp_portal, name,
 415                            &obddev->obd_ldlm_client);
 416
 417         imp = class_new_import(obddev);
 418         if (imp == NULL) {
 419                 rc = -ENOENT;
 420                 goto err_ldlm;
 421         }
 422         imp->imp_client = &obddev->obd_ldlm_client;
 423         imp->imp_connect_op = connect_op;
 424         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 425                LUSTRE_CFG_BUFLEN(lcfg, 1));
 426         class_import_put(imp);
 427
 428         rc = client_import_add_conn(imp, &server_uuid, 1);
 429         if (rc) {
 430                 CERROR("can't add initial connection\n");
 431                 goto err_import;
 432         }
 433
 434         cli->cl_import = imp;
 435         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 436         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 437         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 438
 439         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 440                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 441                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 442                                name, obddev->obd_name,
 443                                cli->cl_target_uuid.uuid);
 444                         spin_lock(&imp->imp_lock);
 445                         imp->imp_deactive = 1;
 446                         spin_unlock(&imp->imp_lock);
 447                 }
 448         }
 449
 450         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 451                                                    LDLM_NAMESPACE_CLIENT,
 452                                                    LDLM_NAMESPACE_GREEDY,
 453                                                    ns_type);
 454         if (obddev->obd_namespace == NULL) {
 455                 CERROR("Unable to create client namespace - %s\n",
 456                        obddev->obd_name);
 457                 rc = -ENOMEM;
 458                 goto err_import;
 459         }
 460
 461         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 462
 463         return rc;
 464
 465 err_import:
 466         class_destroy_import(imp);
 467 err_ldlm:
 468         ldlm_put_ref();
 469 err:
 470         return rc;
 471
 472 }
 473 EXPORT_SYMBOL(client_obd_setup);
 474
 475 int client_obd_cleanup(struct obd_device *obddev)
 476 {
 477         ldlm_namespace_free_post(obddev->obd_namespace);
 478         obddev->obd_namespace = NULL;
 479
 480         LASSERT(obddev->u.cli.cl_import == NULL);
 481
 482         ldlm_put_ref();
 483         return 0;
 484 }
 485 EXPORT_SYMBOL(client_obd_cleanup);
 486
 487 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 488 int client_connect_import(const struct lu_env *env,
 489                           struct obd_export **exp,
 490                           struct obd_device *obd, struct obd_uuid *cluuid,
 491                           struct obd_connect_data *data, void *localdata)
 492 {
 493         struct client_obd       *cli    = &obd->u.cli;
 494         struct obd_import       *imp    = cli->cl_import;
 495         struct obd_connect_data *ocd;
 496         struct lustre_handle    conn    = { 0 };
 497         int                  rc;
 498
 499         *exp = NULL;
 500         down_write(&cli->cl_sem);
 501         if (cli->cl_conn_count > 0) {
 502                 rc = -EALREADY;
 503                 goto out_sem;
 504         }
 505
 506         rc = class_connect(&conn, obd, cluuid);
 507         if (rc)
 508                 goto out_sem;
 509
 510         cli->cl_conn_count++;
 511         *exp = class_conn2export(&conn);
 512
 513         LASSERT(obd->obd_namespace);
 514
 515         imp->imp_dlm_handle = conn;
 516         rc = ptlrpc_init_import(imp);
 517         if (rc != 0)
 518                 goto out_ldlm;
 519
 520         ocd = &imp->imp_connect_data;
 521         if (data) {
 522                 *ocd = *data;
 523                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 524         }
 525
 526         rc = ptlrpc_connect_import(imp);
 527         if (rc != 0) {
 528                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 529                 goto out_ldlm;
 530         }
 531         LASSERT(*exp != NULL && (*exp)->exp_connection);
 532
 533         if (data) {
 534                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 535                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 536                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 537                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 538         }
 539
 540         ptlrpc_pinger_add_import(imp);
 541
 542         if (rc) {
 543 out_ldlm:
 544                 cli->cl_conn_count--;
 545                 class_disconnect(*exp);
 546                 *exp = NULL;
 547         }
 548 out_sem:
 549         up_write(&cli->cl_sem);
 550
 551         return rc;
 552 }
 553 EXPORT_SYMBOL(client_connect_import);
 554
 555 int client_disconnect_export(struct obd_export *exp)
 556 {
 557         struct obd_device *obd = class_exp2obd(exp);
 558         struct client_obd *cli;
 559         struct obd_import *imp;
 560         int rc = 0, err;
 561
 562         if (!obd) {
 563                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 564                        exp, exp ? exp->exp_handle.h_cookie : -1);
 565                 return -EINVAL;
 566         }
 567
 568         cli = &obd->u.cli;
 569         imp = cli->cl_import;
 570
 571         down_write(&cli->cl_sem);
 572         CDEBUG(D_INFO, "disconnect %s - %d\n", obd->obd_name,
 573                cli->cl_conn_count);
 574
 575         if (!cli->cl_conn_count) {
 576                 CERROR("disconnecting disconnected device (%s)\n",
 577                        obd->obd_name);
 578                 rc = -EINVAL;
 579                 goto out_disconnect;
 580         }
 581
 582         cli->cl_conn_count--;
 583         if (cli->cl_conn_count) {
 584                 rc = 0;
 585                 goto out_disconnect;
 586         }
 587
 588         /* Mark import deactivated now, so we don't try to reconnect if any
 589          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 590          * fully deactivate the import, or that would drop all requests. */
 591         spin_lock(&imp->imp_lock);
 592         imp->imp_deactive = 1;
 593         spin_unlock(&imp->imp_lock);
 594
 595         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 596          * delete it regardless.  (It's safe to delete an import that was
 597          * never added.) */
 598         (void)ptlrpc_pinger_del_import(imp);
 599
 600         if (obd->obd_namespace != NULL) {
 601                 /* obd_force == local only */
 602                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 603                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 604                 ldlm_namespace_free_prior(obd->obd_namespace, imp,
 605                                           obd->obd_force);
 606         }
 607
 608         /* There's no need to hold sem while disconnecting an import,
 609          * and it may actually cause deadlock in GSS. */
 610         up_write(&cli->cl_sem);
 611         rc = ptlrpc_disconnect_import(imp, 0);
 612         down_write(&cli->cl_sem);
 613
 614         ptlrpc_invalidate_import(imp);
 615
 616 out_disconnect:
 617         /* Use server style - class_disconnect should be always called for
 618          * o_disconnect. */
 619         err = class_disconnect(exp);
 620         if (!rc && err)
 621                 rc = err;
 622
 623         up_write(&cli->cl_sem);
 624
 625         return rc;
 626 }
 627 EXPORT_SYMBOL(client_disconnect_export);
 628
 629 /**
 630  * Packs current SLV and Limit into \a req.
 631  */
 632 int target_pack_pool_reply(struct ptlrpc_request *req)
 633 {
 634         struct obd_device *obd;
 635
 636         /* Check that we still have all structures alive as this may
 637          * be some late RPC at shutdown time. */
 638         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
 639                      !exp_connect_lru_resize(req->rq_export))) {
 640                 lustre_msg_set_slv(req->rq_repmsg, 0);
 641                 lustre_msg_set_limit(req->rq_repmsg, 0);
 642                 return 0;
 643         }
 644
 645         /* OBD is alive here as export is alive, which we checked above. */
 646         obd = req->rq_export->exp_obd;
 647
 648         read_lock(&obd->obd_pool_lock);
 649         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
 650         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
 651         read_unlock(&obd->obd_pool_lock);
 652
 653         return 0;
 654 }
 655 EXPORT_SYMBOL(target_pack_pool_reply);
 656
 657 static int
 658 target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
 659 {
 660         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
 661                 DEBUG_REQ(D_ERROR, req, "dropping reply");
 662                 return -ECOMM;
 663         }
 664
 665         if (unlikely(rc)) {
 666                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
 667                 req->rq_status = rc;
 668                 return ptlrpc_send_error(req, 1);
 669         }
 670
 671         DEBUG_REQ(D_NET, req, "sending reply");
 672         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
 673 }
 674
 675 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
 676 {
 677         struct ptlrpc_service_part *svcpt;
 678         int                     netrc;
 679         struct ptlrpc_reply_state *rs;
 680         struct obd_export        *exp;
 681
 682         if (req->rq_no_reply)
 683                 return;
 684
 685         svcpt = req->rq_rqbd->rqbd_svcpt;
 686         rs = req->rq_reply_state;
 687         if (rs == NULL || !rs->rs_difficult) {
 688                 /* no notifiers */
 689                 target_send_reply_msg(req, rc, fail_id);
 690                 return;
 691         }
 692
 693         /* must be an export if locks saved */
 694         LASSERT(req->rq_export != NULL);
 695         /* req/reply consistent */
 696         LASSERT(rs->rs_svcpt == svcpt);
 697
 698         /* "fresh" reply */
 699         LASSERT(!rs->rs_scheduled);
 700         LASSERT(!rs->rs_scheduled_ever);
 701         LASSERT(!rs->rs_handled);
 702         LASSERT(!rs->rs_on_net);
 703         LASSERT(rs->rs_export == NULL);
 704         LASSERT(list_empty(&rs->rs_obd_list));
 705         LASSERT(list_empty(&rs->rs_exp_list));
 706
 707         exp = class_export_get(req->rq_export);
 708
 709         /* disable reply scheduling while I'm setting up */
 710         rs->rs_scheduled = 1;
 711         rs->rs_on_net    = 1;
 712         rs->rs_xid       = req->rq_xid;
 713         rs->rs_transno   = req->rq_transno;
 714         rs->rs_export    = exp;
 715         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
 716
 717         spin_lock(&exp->exp_uncommitted_replies_lock);
 718         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
 719                rs->rs_transno, exp->exp_last_committed);
 720         if (rs->rs_transno > exp->exp_last_committed) {
 721                 /* not committed already */
 722                 list_add_tail(&rs->rs_obd_list,
 723                                   &exp->exp_uncommitted_replies);
 724         }
 725         spin_unlock(&exp->exp_uncommitted_replies_lock);
 726
 727         spin_lock(&exp->exp_lock);
 728         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
 729         spin_unlock(&exp->exp_lock);
 730
 731         netrc = target_send_reply_msg(req, rc, fail_id);
 732
 733         spin_lock(&svcpt->scp_rep_lock);
 734
 735         atomic_inc(&svcpt->scp_nreps_difficult);
 736
 737         if (netrc != 0) {
 738                 /* error sending: reply is off the net.  Also we need +1
 739                  * reply ref until ptlrpc_handle_rs() is done
 740                  * with the reply state (if the send was successful, there
 741                  * would have been +1 ref for the net, which
 742                  * reply_out_callback leaves alone) */
 743                 rs->rs_on_net = 0;
 744                 ptlrpc_rs_addref(rs);
 745         }
 746
 747         spin_lock(&rs->rs_lock);
 748         if (rs->rs_transno <= exp->exp_last_committed ||
 749             (!rs->rs_on_net && !rs->rs_no_ack) ||
 750             list_empty(&rs->rs_exp_list) ||     /* completed already */
 751             list_empty(&rs->rs_obd_list)) {
 752                 CDEBUG(D_HA, "Schedule reply immediately\n");
 753                 ptlrpc_dispatch_difficult_reply(rs);
 754         } else {
 755                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
 756                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
 757         }
 758         spin_unlock(&rs->rs_lock);
 759         spin_unlock(&svcpt->scp_rep_lock);
 760 }
 761 EXPORT_SYMBOL(target_send_reply);
 762
 763 ldlm_mode_t lck_compat_array[] = {
 764         [LCK_EX]        = LCK_COMPAT_EX,
 765         [LCK_PW]        = LCK_COMPAT_PW,
 766         [LCK_PR]        = LCK_COMPAT_PR,
 767         [LCK_CW]        = LCK_COMPAT_CW,
 768         [LCK_CR]        = LCK_COMPAT_CR,
 769         [LCK_NL]        = LCK_COMPAT_NL,
 770         [LCK_GROUP]     = LCK_COMPAT_GROUP,
 771         [LCK_COS]       = LCK_COMPAT_COS,
 772 };
 773
 774 /**
 775  * Rather arbitrary mapping from LDLM error codes to errno values. This should
 776  * not escape to the user level.
 777  */
 778 int ldlm_error2errno(ldlm_error_t error)
 779 {
 780         int result;
 781
 782         switch (error) {
 783         case ELDLM_OK:
 784                 result = 0;
 785                 break;
 786         case ELDLM_LOCK_CHANGED:
 787                 result = -ESTALE;
 788                 break;
 789         case ELDLM_LOCK_ABORTED:
 790                 result = -ENAVAIL;
 791                 break;
 792         case ELDLM_LOCK_REPLACED:
 793                 result = -ESRCH;
 794                 break;
 795         case ELDLM_NO_LOCK_DATA:
 796                 result = -ENOENT;
 797                 break;
 798         case ELDLM_NAMESPACE_EXISTS:
 799                 result = -EEXIST;
 800                 break;
 801         case ELDLM_BAD_NAMESPACE:
 802                 result = -EBADF;
 803                 break;
 804         default:
 805                 if (((int)error) < 0)  /* cast to signed type */
 806                         result = error; /* as ldlm_error_t can be unsigned */
 807                 else {
 808                         CERROR("Invalid DLM result code: %d\n", error);
 809                         result = -EPROTO;
 810                 }
 811         }
 812         return result;
 813 }
 814 EXPORT_SYMBOL(ldlm_error2errno);
 815
 816 #if LUSTRE_TRACKS_LOCK_EXP_REFS
 817 void ldlm_dump_export_locks(struct obd_export *exp)
 818 {
 819         spin_lock(&exp->exp_locks_list_guard);
 820         if (!list_empty(&exp->exp_locks_list)) {
 821                 struct ldlm_lock *lock;
 822
 823                 CERROR("dumping locks for export %p,ignore if the unmount doesn't hang\n",
 824                        exp);
 825                 list_for_each_entry(lock, &exp->exp_locks_list,
 826                                         l_exp_refs_link)
 827                         LDLM_ERROR(lock, "lock:");
 828         }
 829         spin_unlock(&exp->exp_locks_list_guard);
 830 }
 831 #endif