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                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  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         if (imp_conn)
 123                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 124 out_put:
 125         ptlrpc_connection_put(ptlrpc_conn);
 126         return rc;
 127 }
 128
 129 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 130 {
 131         return import_set_conn(imp, uuid, 1, 0);
 132 }
 133
 134 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 135                            int priority)
 136 {
 137         return import_set_conn(imp, uuid, priority, 1);
 138 }
 139 EXPORT_SYMBOL(client_import_add_conn);
 140
 141 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 142 {
 143         struct obd_import_conn *imp_conn;
 144         struct obd_export *dlmexp;
 145         int rc = -ENOENT;
 146
 147         spin_lock(&imp->imp_lock);
 148         if (list_empty(&imp->imp_conn_list)) {
 149                 LASSERT(!imp->imp_connection);
 150                 goto out;
 151         }
 152
 153         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 154                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 155                         continue;
 156                 LASSERT(imp_conn->oic_conn);
 157
 158                 if (imp_conn == imp->imp_conn_current) {
 159                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 160
 161                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 162                             imp->imp_state != LUSTRE_IMP_DISCON) {
 163                                 CERROR("can't remove current connection\n");
 164                                 rc = -EBUSY;
 165                                 goto out;
 166                         }
 167
 168                         ptlrpc_connection_put(imp->imp_connection);
 169                         imp->imp_connection = NULL;
 170
 171                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 172                         if (dlmexp && dlmexp->exp_connection) {
 173                                 LASSERT(dlmexp->exp_connection ==
 174                                         imp_conn->oic_conn);
 175                                 ptlrpc_connection_put(dlmexp->exp_connection);
 176                                 dlmexp->exp_connection = NULL;
 177                         }
 178                 }
 179
 180                 list_del(&imp_conn->oic_item);
 181                 ptlrpc_connection_put(imp_conn->oic_conn);
 182                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 183                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 184                        imp, imp->imp_obd->obd_name, uuid->uuid);
 185                 rc = 0;
 186                 break;
 187         }
 188 out:
 189         spin_unlock(&imp->imp_lock);
 190         if (rc == -ENOENT)
 191                 CERROR("connection %s not found\n", uuid->uuid);
 192         return rc;
 193 }
 194 EXPORT_SYMBOL(client_import_del_conn);
 195
 196 /**
 197  * Find conn UUID by peer NID. \a peer is a server NID. This function is used
 198  * to find a conn uuid of \a imp which can reach \a peer.
 199  */
 200 int client_import_find_conn(struct obd_import *imp, lnet_nid_t peer,
 201                             struct obd_uuid *uuid)
 202 {
 203         struct obd_import_conn *conn;
 204         int rc = -ENOENT;
 205
 206         spin_lock(&imp->imp_lock);
 207         list_for_each_entry(conn, &imp->imp_conn_list, oic_item) {
 208                 /* Check if conn UUID does have this peer NID. */
 209                 if (class_check_uuid(&conn->oic_uuid, peer)) {
 210                         *uuid = conn->oic_uuid;
 211                         rc = 0;
 212                         break;
 213                 }
 214         }
 215         spin_unlock(&imp->imp_lock);
 216         return rc;
 217 }
 218 EXPORT_SYMBOL(client_import_find_conn);
 219
 220 void client_destroy_import(struct obd_import *imp)
 221 {
 222         /* Drop security policy instance after all RPCs have finished/aborted
 223          * to let all busy contexts be released. */
 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 /**
 232  * Check whether or not the OSC is on MDT.
 233  * In the config log,
 234  * osc on MDT
 235  *      setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID
 236  * osc on client
 237  *      setup 0:{fsname}-OSTxxxx-osc 1:lustre-OST0000_UUID 2:NID
 238  *
 239  **/
 240 static int osc_on_mdt(char *obdname)
 241 {
 242         char *ptr;
 243
 244         ptr = strrchr(obdname, '-');
 245         if (ptr == NULL)
 246                 return 0;
 247
 248         if (strncmp(ptr + 1, "MDT", 3) == 0)
 249                 return 1;
 250
 251         return 0;
 252 }
 253
 254 /* Configure an RPC client OBD device.
 255  *
 256  * lcfg parameters:
 257  * 1 - client UUID
 258  * 2 - server UUID
 259  * 3 - inactive-on-startup
 260  */
 261 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 262 {
 263         struct client_obd *cli = &obddev->u.cli;
 264         struct obd_import *imp;
 265         struct obd_uuid server_uuid;
 266         int rq_portal, rp_portal, connect_op;
 267         char *name = obddev->obd_type->typ_name;
 268         ldlm_ns_type_t ns_type = LDLM_NS_TYPE_UNKNOWN;
 269         int rc;
 270
 271         /* In a more perfect world, we would hang a ptlrpc_client off of
 272          * obd_type and just use the values from there. */
 273         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 274                 rq_portal = OST_REQUEST_PORTAL;
 275                 rp_portal = OSC_REPLY_PORTAL;
 276                 connect_op = OST_CONNECT;
 277                 cli->cl_sp_me = LUSTRE_SP_CLI;
 278                 cli->cl_sp_to = LUSTRE_SP_OST;
 279                 ns_type = LDLM_NS_TYPE_OSC;
 280         } else if (!strcmp(name, LUSTRE_MDC_NAME) ||
 281                    !strcmp(name, LUSTRE_LWP_NAME)) {
 282                 rq_portal = MDS_REQUEST_PORTAL;
 283                 rp_portal = MDC_REPLY_PORTAL;
 284                 connect_op = MDS_CONNECT;
 285                 cli->cl_sp_me = LUSTRE_SP_CLI;
 286                 cli->cl_sp_to = LUSTRE_SP_MDT;
 287                 ns_type = LDLM_NS_TYPE_MDC;
 288         } else if (!strcmp(name, LUSTRE_OSP_NAME)) {
 289                 if (strstr(lustre_cfg_buf(lcfg, 1), "OST") == NULL) {
 290                         /* OSP_on_MDT for other MDTs */
 291                         connect_op = MDS_CONNECT;
 292                         cli->cl_sp_to = LUSTRE_SP_MDT;
 293                         ns_type = LDLM_NS_TYPE_MDC;
 294                         rq_portal = OUT_PORTAL;
 295                 } else {
 296                         /* OSP on MDT for OST */
 297                         connect_op = OST_CONNECT;
 298                         cli->cl_sp_to = LUSTRE_SP_OST;
 299                         ns_type = LDLM_NS_TYPE_OSC;
 300                         rq_portal = OST_REQUEST_PORTAL;
 301                 }
 302                 rp_portal = OSC_REPLY_PORTAL;
 303                 cli->cl_sp_me = LUSTRE_SP_CLI;
 304         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 305                 rq_portal = MGS_REQUEST_PORTAL;
 306                 rp_portal = MGC_REPLY_PORTAL;
 307                 connect_op = MGS_CONNECT;
 308                 cli->cl_sp_me = LUSTRE_SP_MGC;
 309                 cli->cl_sp_to = LUSTRE_SP_MGS;
 310                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 311                 ns_type = LDLM_NS_TYPE_MGC;
 312         } else {
 313                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 314                        name);
 315                 return -EINVAL;
 316         }
 317
 318         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 319                 CERROR("requires a TARGET UUID\n");
 320                 return -EINVAL;
 321         }
 322
 323         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 324                 CERROR("client UUID must be less than 38 characters\n");
 325                 return -EINVAL;
 326         }
 327
 328         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 329                 CERROR("setup requires a SERVER UUID\n");
 330                 return -EINVAL;
 331         }
 332
 333         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 334                 CERROR("target UUID must be less than 38 characters\n");
 335                 return -EINVAL;
 336         }
 337
 338         init_rwsem(&cli->cl_sem);
 339         mutex_init(&cli->cl_mgc_mutex);
 340         cli->cl_conn_count = 0;
 341         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 342                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 343                      sizeof(server_uuid)));
 344
 345         cli->cl_dirty = 0;
 346         cli->cl_avail_grant = 0;
 347         /* FIXME: Should limit this for the sum of all cl_dirty_max. */
 348         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 349         if (cli->cl_dirty_max >> PAGE_CACHE_SHIFT > totalram_pages / 8)
 350                 cli->cl_dirty_max = totalram_pages << (PAGE_CACHE_SHIFT - 3);
 351         INIT_LIST_HEAD(&cli->cl_cache_waiters);
 352         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 353         INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 354         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 355         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 356         client_obd_list_lock_init(&cli->cl_loi_list_lock);
 357         atomic_set(&cli->cl_pending_w_pages, 0);
 358         atomic_set(&cli->cl_pending_r_pages, 0);
 359         cli->cl_r_in_flight = 0;
 360         cli->cl_w_in_flight = 0;
 361
 362         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 363         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 364         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 365         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 366         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 367         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 368
 369         /* lru for osc. */
 370         INIT_LIST_HEAD(&cli->cl_lru_osc);
 371         atomic_set(&cli->cl_lru_shrinkers, 0);
 372         atomic_set(&cli->cl_lru_busy, 0);
 373         atomic_set(&cli->cl_lru_in_list, 0);
 374         INIT_LIST_HEAD(&cli->cl_lru_list);
 375         client_obd_list_lock_init(&cli->cl_lru_list_lock);
 376
 377         init_waitqueue_head(&cli->cl_destroy_waitq);
 378         atomic_set(&cli->cl_destroy_in_flight, 0);
 379         /* Turn on checksumming by default. */
 380         cli->cl_checksum = 1;
 381         /*
 382          * The supported checksum types will be worked out at connect time
 383          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 384          * through procfs.
 385          */
 386         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 387         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 388
 389         /* This value may be reduced at connect time in
 390          * ptlrpc_connect_interpret() . We initialize it to only
 391          * 1MB until we know what the performance looks like.
 392          * In the future this should likely be increased. LU-1431 */
 393         cli->cl_max_pages_per_rpc = min_t(int, PTLRPC_MAX_BRW_PAGES,
 394                                           LNET_MTU >> PAGE_CACHE_SHIFT);
 395
 396         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 397                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
 398         } else if (totalram_pages >> (20 - PAGE_CACHE_SHIFT) <= 128 /* MB */) {
 399                 cli->cl_max_rpcs_in_flight = 2;
 400         } else if (totalram_pages >> (20 - PAGE_CACHE_SHIFT) <= 256 /* MB */) {
 401                 cli->cl_max_rpcs_in_flight = 3;
 402         } else if (totalram_pages >> (20 - PAGE_CACHE_SHIFT) <= 512 /* MB */) {
 403                 cli->cl_max_rpcs_in_flight = 4;
 404         } else {
 405                 if (osc_on_mdt(obddev->obd_name))
 406                         cli->cl_max_rpcs_in_flight = MDS_OSC_MAX_RIF_DEFAULT;
 407                 else
 408                         cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 409         }
 410         rc = ldlm_get_ref();
 411         if (rc) {
 412                 CERROR("ldlm_get_ref failed: %d\n", rc);
 413                 goto err;
 414         }
 415
 416         ptlrpc_init_client(rq_portal, rp_portal, name,
 417                            &obddev->obd_ldlm_client);
 418
 419         imp = class_new_import(obddev);
 420         if (imp == NULL) {
 421                 rc = -ENOENT;
 422                 goto err_ldlm;
 423         }
 424         imp->imp_client = &obddev->obd_ldlm_client;
 425         imp->imp_connect_op = connect_op;
 426         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 427                LUSTRE_CFG_BUFLEN(lcfg, 1));
 428         class_import_put(imp);
 429
 430         rc = client_import_add_conn(imp, &server_uuid, 1);
 431         if (rc) {
 432                 CERROR("can't add initial connection\n");
 433                 goto err_import;
 434         }
 435
 436         cli->cl_import = imp;
 437         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 438         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 439         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 440
 441         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 442                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 443                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 444                                name, obddev->obd_name,
 445                                cli->cl_target_uuid.uuid);
 446                         spin_lock(&imp->imp_lock);
 447                         imp->imp_deactive = 1;
 448                         spin_unlock(&imp->imp_lock);
 449                 }
 450         }
 451
 452         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 453                                                    LDLM_NAMESPACE_CLIENT,
 454                                                    LDLM_NAMESPACE_GREEDY,
 455                                                    ns_type);
 456         if (obddev->obd_namespace == NULL) {
 457                 CERROR("Unable to create client namespace - %s\n",
 458                        obddev->obd_name);
 459                 rc = -ENOMEM;
 460                 goto err_import;
 461         }
 462
 463         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 464
 465         return rc;
 466
 467 err_import:
 468         class_destroy_import(imp);
 469 err_ldlm:
 470         ldlm_put_ref();
 471 err:
 472         return rc;
 473
 474 }
 475 EXPORT_SYMBOL(client_obd_setup);
 476
 477 int client_obd_cleanup(struct obd_device *obddev)
 478 {
 479         ldlm_namespace_free_post(obddev->obd_namespace);
 480         obddev->obd_namespace = NULL;
 481
 482         LASSERT(obddev->u.cli.cl_import == NULL);
 483
 484         ldlm_put_ref();
 485         return 0;
 486 }
 487 EXPORT_SYMBOL(client_obd_cleanup);
 488
 489 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 490 int client_connect_import(const struct lu_env *env,
 491                           struct obd_export **exp,
 492                           struct obd_device *obd, struct obd_uuid *cluuid,
 493                           struct obd_connect_data *data, void *localdata)
 494 {
 495         struct client_obd       *cli    = &obd->u.cli;
 496         struct obd_import       *imp    = cli->cl_import;
 497         struct obd_connect_data *ocd;
 498         struct lustre_handle    conn    = { 0 };
 499         int                  rc;
 500
 501         *exp = NULL;
 502         down_write(&cli->cl_sem);
 503         if (cli->cl_conn_count > 0) {
 504                 rc = -EALREADY;
 505                 goto out_sem;
 506         }
 507
 508         rc = class_connect(&conn, obd, cluuid);
 509         if (rc)
 510                 goto out_sem;
 511
 512         cli->cl_conn_count++;
 513         *exp = class_conn2export(&conn);
 514
 515         LASSERT(obd->obd_namespace);
 516
 517         imp->imp_dlm_handle = conn;
 518         rc = ptlrpc_init_import(imp);
 519         if (rc != 0)
 520                 goto out_ldlm;
 521
 522         ocd = &imp->imp_connect_data;
 523         if (data) {
 524                 *ocd = *data;
 525                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 526         }
 527
 528         rc = ptlrpc_connect_import(imp);
 529         if (rc != 0) {
 530                 LASSERT(imp->imp_state == LUSTRE_IMP_DISCON);
 531                 goto out_ldlm;
 532         }
 533         LASSERT(*exp != NULL && (*exp)->exp_connection);
 534
 535         if (data) {
 536                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 537                          ocd->ocd_connect_flags, "old %#llx, new %#llx\n",
 538                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 539                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 540         }
 541
 542         ptlrpc_pinger_add_import(imp);
 543
 544         if (rc) {
 545 out_ldlm:
 546                 cli->cl_conn_count--;
 547                 class_disconnect(*exp);
 548                 *exp = NULL;
 549         }
 550 out_sem:
 551         up_write(&cli->cl_sem);
 552
 553         return rc;
 554 }
 555 EXPORT_SYMBOL(client_connect_import);
 556
 557 int client_disconnect_export(struct obd_export *exp)
 558 {
 559         struct obd_device *obd = class_exp2obd(exp);
 560         struct client_obd *cli;
 561         struct obd_import *imp;
 562         int rc = 0, err;
 563
 564         if (!obd) {
 565                 CERROR("invalid export for disconnect: exp %p cookie %#llx\n",
 566                        exp, exp ? exp->exp_handle.h_cookie : -1);
 567                 return -EINVAL;
 568         }
 569
 570         cli = &obd->u.cli;
 571         imp = cli->cl_import;
 572
 573         down_write(&cli->cl_sem);
 574         CDEBUG(D_INFO, "disconnect %s - %d\n", obd->obd_name,
 575                cli->cl_conn_count);
 576
 577         if (!cli->cl_conn_count) {
 578                 CERROR("disconnecting disconnected device (%s)\n",
 579                        obd->obd_name);
 580                 rc = -EINVAL;
 581                 goto out_disconnect;
 582         }
 583
 584         cli->cl_conn_count--;
 585         if (cli->cl_conn_count) {
 586                 rc = 0;
 587                 goto out_disconnect;
 588         }
 589
 590         /* Mark import deactivated now, so we don't try to reconnect if any
 591          * of the cleanup RPCs fails (e.g. LDLM cancel, etc).  We don't
 592          * fully deactivate the import, or that would drop all requests. */
 593         spin_lock(&imp->imp_lock);
 594         imp->imp_deactive = 1;
 595         spin_unlock(&imp->imp_lock);
 596
 597         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 598          * delete it regardless.  (It's safe to delete an import that was
 599          * never added.) */
 600         (void)ptlrpc_pinger_del_import(imp);
 601
 602         if (obd->obd_namespace != NULL) {
 603                 /* obd_force == local only */
 604                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 605                                        obd->obd_force ? LCF_LOCAL : 0, NULL);
 606                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 607         }
 608
 609         /* There's no need to hold sem while disconnecting an import,
 610          * and it may actually cause deadlock in GSS. */
 611         up_write(&cli->cl_sem);
 612         rc = ptlrpc_disconnect_import(imp, 0);
 613         down_write(&cli->cl_sem);
 614
 615         ptlrpc_invalidate_import(imp);
 616
 617 out_disconnect:
 618         /* Use server style - class_disconnect should be always called for
 619          * o_disconnect. */
 620         err = class_disconnect(exp);
 621         if (!rc && err)
 622                 rc = err;
 623
 624         up_write(&cli->cl_sem);
 625
 626         return rc;
 627 }
 628 EXPORT_SYMBOL(client_disconnect_export);
 629
 630
 631 /**
 632  * Packs current SLV and Limit into \a req.
 633  */
 634 int target_pack_pool_reply(struct ptlrpc_request *req)
 635 {
 636         struct obd_device *obd;
 637
 638         /* Check that we still have all structures alive as this may
 639          * be some late RPC at shutdown time. */
 640         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
 641                      !exp_connect_lru_resize(req->rq_export))) {
 642                 lustre_msg_set_slv(req->rq_repmsg, 0);
 643                 lustre_msg_set_limit(req->rq_repmsg, 0);
 644                 return 0;
 645         }
 646
 647         /* OBD is alive here as export is alive, which we checked above. */
 648         obd = req->rq_export->exp_obd;
 649
 650         read_lock(&obd->obd_pool_lock);
 651         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
 652         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
 653         read_unlock(&obd->obd_pool_lock);
 654
 655         return 0;
 656 }
 657 EXPORT_SYMBOL(target_pack_pool_reply);
 658
 659 int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
 660 {
 661         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
 662                 DEBUG_REQ(D_ERROR, req, "dropping reply");
 663                 return -ECOMM;
 664         }
 665
 666         if (unlikely(rc)) {
 667                 DEBUG_REQ(D_NET, req, "processing error (%d)", rc);
 668                 req->rq_status = rc;
 669                 return ptlrpc_send_error(req, 1);
 670         } else {
 671                 DEBUG_REQ(D_NET, req, "sending reply");
 672         }
 673
 674         return ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT);
 675 }
 676
 677 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
 678 {
 679         struct ptlrpc_service_part *svcpt;
 680         int                     netrc;
 681         struct ptlrpc_reply_state *rs;
 682         struct obd_export        *exp;
 683
 684         if (req->rq_no_reply)
 685                 return;
 686
 687         svcpt = req->rq_rqbd->rqbd_svcpt;
 688         rs = req->rq_reply_state;
 689         if (rs == NULL || !rs->rs_difficult) {
 690                 /* no notifiers */
 691                 target_send_reply_msg(req, rc, fail_id);
 692                 return;
 693         }
 694
 695         /* must be an export if locks saved */
 696         LASSERT(req->rq_export != NULL);
 697         /* req/reply consistent */
 698         LASSERT(rs->rs_svcpt == svcpt);
 699
 700         /* "fresh" reply */
 701         LASSERT(!rs->rs_scheduled);
 702         LASSERT(!rs->rs_scheduled_ever);
 703         LASSERT(!rs->rs_handled);
 704         LASSERT(!rs->rs_on_net);
 705         LASSERT(rs->rs_export == NULL);
 706         LASSERT(list_empty(&rs->rs_obd_list));
 707         LASSERT(list_empty(&rs->rs_exp_list));
 708
 709         exp = class_export_get(req->rq_export);
 710
 711         /* disable reply scheduling while I'm setting up */
 712         rs->rs_scheduled = 1;
 713         rs->rs_on_net    = 1;
 714         rs->rs_xid       = req->rq_xid;
 715         rs->rs_transno   = req->rq_transno;
 716         rs->rs_export    = exp;
 717         rs->rs_opc       = lustre_msg_get_opc(req->rq_reqmsg);
 718
 719         spin_lock(&exp->exp_uncommitted_replies_lock);
 720         CDEBUG(D_NET, "rs transno = %llu, last committed = %llu\n",
 721                rs->rs_transno, exp->exp_last_committed);
 722         if (rs->rs_transno > exp->exp_last_committed) {
 723                 /* not committed already */
 724                 list_add_tail(&rs->rs_obd_list,
 725                                   &exp->exp_uncommitted_replies);
 726         }
 727         spin_unlock(&exp->exp_uncommitted_replies_lock);
 728
 729         spin_lock(&exp->exp_lock);
 730         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
 731         spin_unlock(&exp->exp_lock);
 732
 733         netrc = target_send_reply_msg(req, rc, fail_id);
 734
 735         spin_lock(&svcpt->scp_rep_lock);
 736
 737         atomic_inc(&svcpt->scp_nreps_difficult);
 738
 739         if (netrc != 0) {
 740                 /* error sending: reply is off the net.  Also we need +1
 741                  * reply ref until ptlrpc_handle_rs() is done
 742                  * with the reply state (if the send was successful, there
 743                  * would have been +1 ref for the net, which
 744                  * reply_out_callback leaves alone) */
 745                 rs->rs_on_net = 0;
 746                 ptlrpc_rs_addref(rs);
 747         }
 748
 749         spin_lock(&rs->rs_lock);
 750         if (rs->rs_transno <= exp->exp_last_committed ||
 751             (!rs->rs_on_net && !rs->rs_no_ack) ||
 752             list_empty(&rs->rs_exp_list) ||     /* completed already */
 753             list_empty(&rs->rs_obd_list)) {
 754                 CDEBUG(D_HA, "Schedule reply immediately\n");
 755                 ptlrpc_dispatch_difficult_reply(rs);
 756         } else {
 757                 list_add(&rs->rs_list, &svcpt->scp_rep_active);
 758                 rs->rs_scheduled = 0;   /* allow notifier to schedule */
 759         }
 760         spin_unlock(&rs->rs_lock);
 761         spin_unlock(&svcpt->scp_rep_lock);
 762 }
 763 EXPORT_SYMBOL(target_send_reply);
 764
 765 ldlm_mode_t lck_compat_array[] = {
 766         [LCK_EX]        = LCK_COMPAT_EX,
 767         [LCK_PW]        = LCK_COMPAT_PW,
 768         [LCK_PR]        = LCK_COMPAT_PR,
 769         [LCK_CW]        = LCK_COMPAT_CW,
 770         [LCK_CR]        = LCK_COMPAT_CR,
 771         [LCK_NL]        = LCK_COMPAT_NL,
 772         [LCK_GROUP]     = LCK_COMPAT_GROUP,
 773         [LCK_COS]       = LCK_COMPAT_COS,
 774 };
 775
 776 /**
 777  * Rather arbitrary mapping from LDLM error codes to errno values. This should
 778  * not escape to the user level.
 779  */
 780 int ldlm_error2errno(ldlm_error_t error)
 781 {
 782         int result;
 783
 784         switch (error) {
 785         case ELDLM_OK:
 786                 result = 0;
 787                 break;
 788         case ELDLM_LOCK_CHANGED:
 789                 result = -ESTALE;
 790                 break;
 791         case ELDLM_LOCK_ABORTED:
 792                 result = -ENAVAIL;
 793                 break;
 794         case ELDLM_LOCK_REPLACED:
 795                 result = -ESRCH;
 796                 break;
 797         case ELDLM_NO_LOCK_DATA:
 798                 result = -ENOENT;
 799                 break;
 800         case ELDLM_NAMESPACE_EXISTS:
 801                 result = -EEXIST;
 802                 break;
 803         case ELDLM_BAD_NAMESPACE:
 804                 result = -EBADF;
 805                 break;
 806         default:
 807                 if (((int)error) < 0)  /* cast to signed type */
 808                         result = error; /* as ldlm_error_t can be unsigned */
 809                 else {
 810                         CERROR("Invalid DLM result code: %d\n", error);
 811                         result = -EPROTO;
 812                 }
 813         }
 814         return result;
 815 }
 816 EXPORT_SYMBOL(ldlm_error2errno);
 817
 818 /**
 819  * Dual to ldlm_error2errno(): maps errno values back to ldlm_error_t.
 820  */
 821 ldlm_error_t ldlm_errno2error(int err_no)
 822 {
 823         int error;
 824
 825         switch (err_no) {
 826         case 0:
 827                 error = ELDLM_OK;
 828                 break;
 829         case -ESTALE:
 830                 error = ELDLM_LOCK_CHANGED;
 831                 break;
 832         case -ENAVAIL:
 833                 error = ELDLM_LOCK_ABORTED;
 834                 break;
 835         case -ESRCH:
 836                 error = ELDLM_LOCK_REPLACED;
 837                 break;
 838         case -ENOENT:
 839                 error = ELDLM_NO_LOCK_DATA;
 840                 break;
 841         case -EEXIST:
 842                 error = ELDLM_NAMESPACE_EXISTS;
 843                 break;
 844         case -EBADF:
 845                 error = ELDLM_BAD_NAMESPACE;
 846                 break;
 847         default:
 848                 error = err_no;
 849         }
 850         return error;
 851 }
 852 EXPORT_SYMBOL(ldlm_errno2error);
 853
 854 #if LUSTRE_TRACKS_LOCK_EXP_REFS
 855 void ldlm_dump_export_locks(struct obd_export *exp)
 856 {
 857         spin_lock(&exp->exp_locks_list_guard);
 858         if (!list_empty(&exp->exp_locks_list)) {
 859                 struct ldlm_lock *lock;
 860
 861                 CERROR("dumping locks for export %p,"
 862                        "ignore if the unmount doesn't hang\n", exp);
 863                 list_for_each_entry(lock, &exp->exp_locks_list,
 864                                         l_exp_refs_link)
 865                         LDLM_ERROR(lock, "lock:");
 866         }
 867         spin_unlock(&exp->exp_locks_list_guard);
 868 }
 869 #endif