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, 2015, 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          */
 224         class_import_get(imp);
 225         class_destroy_import(imp);
 226         sptlrpc_import_sec_put(imp);
 227         class_import_put(imp);
 228 }
 229 EXPORT_SYMBOL(client_destroy_import);
 230
 231 /* Configure an RPC client OBD device.
 232  *
 233  * lcfg parameters:
 234  * 1 - client UUID
 235  * 2 - server UUID
 236  * 3 - inactive-on-startup
 237  */
 238 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 239 {
 240         struct client_obd *cli = &obddev->u.cli;
 241         struct obd_import *imp;
 242         struct obd_uuid server_uuid;
 243         int rq_portal, rp_portal, connect_op;
 244         char *name = obddev->obd_type->typ_name;
 245         enum ldlm_ns_type ns_type = LDLM_NS_TYPE_UNKNOWN;
 246         int rc;
 247
 248         /* In a more perfect world, we would hang a ptlrpc_client off of
 249          * obd_type and just use the values from there.
 250          */
 251         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 252                 rq_portal = OST_REQUEST_PORTAL;
 253                 rp_portal = OSC_REPLY_PORTAL;
 254                 connect_op = OST_CONNECT;
 255                 cli->cl_sp_me = LUSTRE_SP_CLI;
 256                 cli->cl_sp_to = LUSTRE_SP_OST;
 257                 ns_type = LDLM_NS_TYPE_OSC;
 258         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
 259                    !strcmp(name, LUSTRE_LWP_NAME)) {
 260                 rq_portal = MDS_REQUEST_PORTAL;
 261                 rp_portal = MDC_REPLY_PORTAL;
 262                 connect_op = MDS_CONNECT;
 263                 cli->cl_sp_me = LUSTRE_SP_CLI;
 264                 cli->cl_sp_to = LUSTRE_SP_MDT;
 265                 ns_type = LDLM_NS_TYPE_MDC;
 266         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 267                 rq_portal = MGS_REQUEST_PORTAL;
 268                 rp_portal = MGC_REPLY_PORTAL;
 269                 connect_op = MGS_CONNECT;
 270                 cli->cl_sp_me = LUSTRE_SP_MGC;
 271                 cli->cl_sp_to = LUSTRE_SP_MGS;
 272                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 273                 ns_type = LDLM_NS_TYPE_MGC;
 274         } else {
 275                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 276                        name);
 277                 return -EINVAL;
 278         }
 279
 280         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 281                 CERROR("requires a TARGET UUID\n");
 282                 return -EINVAL;
 283         }
 284
 285         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 286                 CERROR("client UUID must be less than 38 characters\n");
 287                 return -EINVAL;
 288         }
 289
 290         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 291                 CERROR("setup requires a SERVER UUID\n");
 292                 return -EINVAL;
 293         }
 294
 295         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 296                 CERROR("target UUID must be less than 38 characters\n");
 297                 return -EINVAL;
 298         }
 299
 300         init_rwsem(&cli->cl_sem);
 301         cli->cl_conn_count = 0;
 302         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 303                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 304                      sizeof(server_uuid)));
 305
 306         cli->cl_dirty = 0;
 307         cli->cl_avail_grant = 0;
 308         /* FIXME: Should limit this for the sum of all cl_dirty_max. */
 309         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 310         if (cli->cl_dirty_max >> PAGE_SHIFT > totalram_pages / 8)
 311                 cli->cl_dirty_max = totalram_pages << (PAGE_SHIFT - 3);
 312         INIT_LIST_HEAD(&cli->cl_cache_waiters);
 313         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 314         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 315         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 316         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 317         spin_lock_init(&cli->cl_loi_list_lock);
 318         atomic_set(&cli->cl_pending_w_pages, 0);
 319         atomic_set(&cli->cl_pending_r_pages, 0);
 320         cli->cl_r_in_flight = 0;
 321         cli->cl_w_in_flight = 0;
 322
 323         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 324         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 325         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 326         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 327         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 328         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 329
 330         /* lru for osc. */
 331         INIT_LIST_HEAD(&cli->cl_lru_osc);
 332         atomic_set(&cli->cl_lru_shrinkers, 0);
 333         atomic_set(&cli->cl_lru_busy, 0);
 334         atomic_set(&cli->cl_lru_in_list, 0);
 335         INIT_LIST_HEAD(&cli->cl_lru_list);
 336         spin_lock_init(&cli->cl_lru_list_lock);
 337         atomic_set(&cli->cl_unstable_count, 0);
 338
 339         init_waitqueue_head(&cli->cl_destroy_waitq);
 340         atomic_set(&cli->cl_destroy_in_flight, 0);
 341         /* Turn on checksumming by default. */
 342         cli->cl_checksum = 1;
 343         /*
 344          * The supported checksum types will be worked out at connect time
 345          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 346          * through procfs.
 347          */
 348         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 349         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 350
 351         /* This value may be reduced at connect time in
 352          * ptlrpc_connect_interpret() . We initialize it to only
 353          * 1MB until we know what the performance looks like.
 354          * In the future this should likely be increased. LU-1431
 355          */
 356         cli->cl_max_pages_per_rpc = min_t(int, PTLRPC_MAX_BRW_PAGES,
 357                                           LNET_MTU >> PAGE_SHIFT);
 358
 359         /*
 360          * set cl_chunkbits default value to PAGE_CACHE_SHIFT,
 361          * it will be updated at OSC connection time.
 362          */
 363         cli->cl_chunkbits = PAGE_SHIFT;
 364
 365         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 366                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
 367         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 128 /* MB */) {
 368                 cli->cl_max_rpcs_in_flight = 2;
 369         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 256 /* MB */) {
 370                 cli->cl_max_rpcs_in_flight = 3;
 371         } else if (totalram_pages >> (20 - PAGE_SHIFT) <= 512 /* MB */) {
 372                 cli->cl_max_rpcs_in_flight = 4;
 373         } else {
 374                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 375         }
 376         rc = ldlm_get_ref();
 377         if (rc) {
 378                 CERROR("ldlm_get_ref failed: %d\n", rc);
 379                 goto err;
 380         }
 381
 382         ptlrpc_init_client(rq_portal, rp_portal, name,
 383                            &obddev->obd_ldlm_client);
 384
 385         imp = class_new_import(obddev);
 386         if (!imp) {
 387                 rc = -ENOENT;
 388                 goto err_ldlm;
 389         }
 390         imp->imp_client = &obddev->obd_ldlm_client;
 391         imp->imp_connect_op = connect_op;
 392         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 393                LUSTRE_CFG_BUFLEN(lcfg, 1));
 394         class_import_put(imp);
 395
 396         rc = client_import_add_conn(imp, &server_uuid, 1);
 397         if (rc) {
 398                 CERROR("can't add initial connection\n");
 399                 goto err_import;
 400         }
 401
 402         cli->cl_import = imp;
 403         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 404         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 405         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 406
 407         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 408                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 409                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 410                                name, obddev->obd_name,
 411                                cli->cl_target_uuid.uuid);
 412                         spin_lock(&imp->imp_lock);
 413                         imp->imp_deactive = 1;
 414                         spin_unlock(&imp->imp_lock);
 415                 }
 416         }
 417
 418         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 419                                                    LDLM_NAMESPACE_CLIENT,
 420                                                    LDLM_NAMESPACE_GREEDY,
 421                                                    ns_type);
 422         if (!obddev->obd_namespace) {
 423                 CERROR("Unable to create client namespace - %s\n",
 424                        obddev->obd_name);
 425                 rc = -ENOMEM;
 426                 goto err_import;
 427         }
 428
 429         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 430
 431         return rc;
 432
 433 err_import:
 434         class_destroy_import(imp);
 435 err_ldlm:
 436         ldlm_put_ref();
 437 err:
 438         return rc;
 439 }
 440 EXPORT_SYMBOL(client_obd_setup);
 441
 442 int client_obd_cleanup(struct obd_device *obddev)
 443 {
 444         ldlm_namespace_free_post(obddev->obd_namespace);
 445         obddev->obd_namespace = NULL;
 446
 447         obd_cleanup_client_import(obddev);
 448         LASSERT(!obddev->u.cli.cl_import);
 449
 450         ldlm_put_ref();
 451         return 0;
 452 }
 453 EXPORT_SYMBOL(client_obd_cleanup);
 454
 455 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 456 int client_connect_import(const struct lu_env *env,
 457                           struct obd_export **exp,
 458                           struct obd_device *obd, struct obd_uuid *cluuid,
 459                           struct obd_connect_data *data, void *localdata)
 460 {
 461         struct client_obd       *cli    = &obd->u.cli;
 462         struct obd_import       *imp    = cli->cl_import;
 463         struct obd_connect_data *ocd;
 464         struct lustre_handle    conn    = { 0 };
 465         int                  rc;
 466
 467         *exp = NULL;
 468         down_write(&cli->cl_sem);
 469         if (cli->cl_conn_count > 0) {
 470                 rc = -EALREADY;
 471                 goto out_sem;
 472         }
 473
 474         rc = class_connect(&conn, obd, cluuid);
 475         if (rc)
 476                 goto out_sem;
 477
 478         cli->cl_conn_count++;
 479         *exp = class_conn2export(&conn);
 480
 481         LASSERT(obd->obd_namespace);
 482
 483         imp->imp_dlm_handle = conn;
 484         rc = ptlrpc_init_import(imp);
 485         if (rc != 0)
 486                 goto out_ldlm;
 487
 488         ocd = &imp->imp_connect_data;
 489         if (data) {
 490                 *ocd = *data;
 491                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 492         }
 493
 494         rc = ptlrpc_connect_import(imp);
 495         if (rc != 0) {
 496                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 497                 goto out_ldlm;
 498         }
 499         LASSERT(*exp && (*exp)->exp_connection);
 500
 501         if (data) {
 502                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 503                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 504                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 505                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 506         }
 507
 508         ptlrpc_pinger_add_import(imp);
 509
 510         if (rc) {
 511 out_ldlm:
 512                 cli->cl_conn_count--;
 513                 class_disconnect(*exp);
 514                 *exp = NULL;
 515         }
 516 out_sem:
 517         up_write(&cli->cl_sem);
 518
 519         return rc;
 520 }
 521 EXPORT_SYMBOL(client_connect_import);
 522
 523 int client_disconnect_export(struct obd_export *exp)
 524 {
 525         struct obd_device *obd = class_exp2obd(exp);
 526         struct client_obd *cli;
 527         struct obd_import *imp;
 528         int rc = 0, err;
 529
 530         if (!obd) {
 531                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 532                        exp, exp ? exp->exp_handle.h_cookie : -1);
 533                 return -EINVAL;
 534         }
 535
 536         cli = &obd->u.cli;
 537         imp = cli->cl_import;
 538
 539         down_write(&cli->cl_sem);
 540         CDEBUG(D_INFO, "disconnect %s - %d\n", obd->obd_name,
 541                cli->cl_conn_count);
 542
 543         if (!cli->cl_conn_count) {
 544                 CERROR("disconnecting disconnected device (%s)\n",
 545                        obd->obd_name);
 546                 rc = -EINVAL;
 547                 goto out_disconnect;
 548         }
 549
 550         cli->cl_conn_count--;
 551         if (cli->cl_conn_count) {
 552                 rc = 0;
 553                 goto out_disconnect;
 554         }
 555
 556         /* Mark import deactivated now, so we don't try to reconnect if any
 557          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 558          * fully deactivate the import, or that would drop all requests.
 559          */
 560         spin_lock(&imp->imp_lock);
 561         imp->imp_deactive = 1;
 562         spin_unlock(&imp->imp_lock);
 563
 564         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 565          * delete it regardless.  (It's safe to delete an import that was
 566          * never added.)
 567          */
 568         (void)ptlrpc_pinger_del_import(imp);
 569
 570         if (obd->obd_namespace) {
 571                 /* obd_force == local only */
 572                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 573                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 574                 ldlm_namespace_free_prior(obd->obd_namespace, imp,
 575                                           obd->obd_force);
 576         }
 577
 578         /* There's no need to hold sem while disconnecting an import,
 579          * and it may actually cause deadlock in GSS.
 580          */
 581         up_write(&cli->cl_sem);
 582         rc = ptlrpc_disconnect_import(imp, 0);
 583         down_write(&cli->cl_sem);
 584
 585         ptlrpc_invalidate_import(imp);
 586
 587 out_disconnect:
 588         /* Use server style - class_disconnect should be always called for
 589          * o_disconnect.
 590          */
 591         err = class_disconnect(exp);
 592         if (!rc && err)
 593                 rc = err;
 594
 595         up_write(&cli->cl_sem);
 596
 597         return rc;
 598 }
 599 EXPORT_SYMBOL(client_disconnect_export);
 600
 601 /**
 602  * Packs current SLV and Limit into \a req.
 603  */
 604 int target_pack_pool_reply(struct ptlrpc_request *req)
 605 {
 606         struct obd_device *obd;
 607
 608         /* Check that we still have all structures alive as this may
 609          * be some late RPC at shutdown time.
 610          */
 611         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
 612                      !exp_connect_lru_resize(req->rq_export))) {
 613                 lustre_msg_set_slv(req->rq_repmsg, 0);
 614                 lustre_msg_set_limit(req->rq_repmsg, 0);
 615                 return 0;
 616         }
 617
 618         /* OBD is alive here as export is alive, which we checked above. */
 619         obd = req->rq_export->exp_obd;
 620
 621         read_lock(&obd->obd_pool_lock);
 622         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
 623         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
 624         read_unlock(&obd->obd_pool_lock);
 625
 626         return 0;
 627 }
 628 EXPORT_SYMBOL(target_pack_pool_reply);
 629
 630 static int
 631 target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
 632 {
 633         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
 634                 DEBUG_REQ(D_ERROR, req, "dropping reply");
 635                 return -ECOMM;
 636         }
 637
 638         if (unlikely(rc)) {
 639                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
 640                 req->rq_status = rc;
 641                 return ptlrpc_send_error(req, 1);
 642         }
 643
 644         DEBUG_REQ(D_NET, req, "sending reply");
 645         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
 646 }
 647
 648 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
 649 {
 650         struct ptlrpc_service_part *svcpt;
 651         int                     netrc;
 652         struct ptlrpc_reply_state *rs;
 653         struct obd_export        *exp;
 654
 655         if (req->rq_no_reply)
 656                 return;
 657
 658         svcpt = req->rq_rqbd->rqbd_svcpt;
 659         rs = req->rq_reply_state;
 660         if (!rs || !rs->rs_difficult) {
 661                 /* no notifiers */
 662                 target_send_reply_msg(req, rc, fail_id);
 663                 return;
 664         }
 665
 666         /* must be an export if locks saved */
 667         LASSERT(req->rq_export);
 668         /* req/reply consistent */
 669         LASSERT(rs->rs_svcpt == svcpt);
 670
 671         /* "fresh" reply */
 672         LASSERT(!rs->rs_scheduled);
 673         LASSERT(!rs->rs_scheduled_ever);
 674         LASSERT(!rs->rs_handled);
 675         LASSERT(!rs->rs_on_net);
 676         LASSERT(!rs->rs_export);
 677         LASSERT(list_empty(&rs->rs_obd_list));
 678         LASSERT(list_empty(&rs->rs_exp_list));
 679
 680         exp = class_export_get(req->rq_export);
 681
 682         /* disable reply scheduling while I'm setting up */
 683         rs->rs_scheduled = 1;
 684         rs->rs_on_net    = 1;
 685         rs->rs_xid       = req->rq_xid;
 686         rs->rs_transno   = req->rq_transno;
 687         rs->rs_export    = exp;
 688         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
 689
 690         spin_lock(&exp->exp_uncommitted_replies_lock);
 691         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
 692                rs->rs_transno, exp->exp_last_committed);
 693         if (rs->rs_transno > exp->exp_last_committed) {
 694                 /* not committed already */
 695                 list_add_tail(&rs->rs_obd_list,
 696                                   &exp->exp_uncommitted_replies);
 697         }
 698         spin_unlock(&exp->exp_uncommitted_replies_lock);
 699
 700         spin_lock(&exp->exp_lock);
 701         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
 702         spin_unlock(&exp->exp_lock);
 703
 704         netrc = target_send_reply_msg(req, rc, fail_id);
 705
 706         spin_lock(&svcpt->scp_rep_lock);
 707
 708         atomic_inc(&svcpt->scp_nreps_difficult);
 709
 710         if (netrc != 0) {
 711                 /* error sending: reply is off the net.  Also we need +1
 712                  * reply ref until ptlrpc_handle_rs() is done
 713                  * with the reply state (if the send was successful, there
 714                  * would have been +1 ref for the net, which
 715                  * reply_out_callback leaves alone)
 716                  */
 717                 rs->rs_on_net = 0;
 718                 ptlrpc_rs_addref(rs);
 719         }
 720
 721         spin_lock(&rs->rs_lock);
 722         if (rs->rs_transno <= exp->exp_last_committed ||
 723             (!rs->rs_on_net && !rs->rs_no_ack) ||
 724             list_empty(&rs->rs_exp_list) ||     /* completed already */
 725             list_empty(&rs->rs_obd_list)) {
 726                 CDEBUG(D_HA, "Schedule reply immediately\n");
 727                 ptlrpc_dispatch_difficult_reply(rs);
 728         } else {
 729                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
 730                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
 731         }
 732         spin_unlock(&rs->rs_lock);
 733         spin_unlock(&svcpt->scp_rep_lock);
 734 }
 735 EXPORT_SYMBOL(target_send_reply);
 736
 737 enum ldlm_mode lck_compat_array[] = {
 738         [LCK_EX]        = LCK_COMPAT_EX,
 739         [LCK_PW]        = LCK_COMPAT_PW,
 740         [LCK_PR]        = LCK_COMPAT_PR,
 741         [LCK_CW]        = LCK_COMPAT_CW,
 742         [LCK_CR]        = LCK_COMPAT_CR,
 743         [LCK_NL]        = LCK_COMPAT_NL,
 744         [LCK_GROUP]     = LCK_COMPAT_GROUP,
 745         [LCK_COS]       = LCK_COMPAT_COS,
 746 };
 747
 748 /**
 749  * Rather arbitrary mapping from LDLM error codes to errno values. This should
 750  * not escape to the user level.
 751  */
 752 int ldlm_error2errno(enum ldlm_error error)
 753 {
 754         int result;
 755
 756         switch (error) {
 757         case ELDLM_OK:
 758         case ELDLM_LOCK_MATCHED:
 759                 result = 0;
 760                 break;
 761         case ELDLM_LOCK_CHANGED:
 762                 result = -ESTALE;
 763                 break;
 764         case ELDLM_LOCK_ABORTED:
 765                 result = -ENAVAIL;
 766                 break;
 767         case ELDLM_LOCK_REPLACED:
 768                 result = -ESRCH;
 769                 break;
 770         case ELDLM_NO_LOCK_DATA:
 771                 result = -ENOENT;
 772                 break;
 773         case ELDLM_NAMESPACE_EXISTS:
 774                 result = -EEXIST;
 775                 break;
 776         case ELDLM_BAD_NAMESPACE:
 777                 result = -EBADF;
 778                 break;
 779         default:
 780                 if (((int)error) < 0)  /* cast to signed type */
 781                         result = error; /* as enum ldlm_error can be unsigned */
 782                 else {
 783                         CERROR("Invalid DLM result code: %d\n", error);
 784                         result = -EPROTO;
 785                 }
 786         }
 787         return result;
 788 }
 789 EXPORT_SYMBOL(ldlm_error2errno);
 790
 791 #if LUSTRE_TRACKS_LOCK_EXP_REFS
 792 void ldlm_dump_export_locks(struct obd_export *exp)
 793 {
 794         spin_lock(&exp->exp_locks_list_guard);
 795         if (!list_empty(&exp->exp_locks_list)) {
 796                 struct ldlm_lock *lock;
 797
 798                 CERROR("dumping locks for export %p,ignore if the unmount doesn't hang\n",
 799                        exp);
 800                 list_for_each_entry(lock, &exp->exp_locks_list,
 801                                         l_exp_refs_link)
 802                         LDLM_ERROR(lock, "lock:");
 803         }
 804         spin_unlock(&exp->exp_locks_list_guard);
 805 }
 806 #endif