lustre/ldlm/ldlm_lib.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  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 #ifndef EXPORT_SYMTAB
  38 # define EXPORT_SYMTAB
  39 #endif
  40 #define DEBUG_SUBSYSTEM S_LDLM
  41
  42 #ifdef __KERNEL__
  43 # include <libcfs/libcfs.h>
  44 #else
  45 # include <liblustre.h>
  46 #endif
  47 #include <obd.h>
  48 #include <lustre_mds.h>
  49 #include <lustre_dlm.h>
  50 #include <lustre_net.h>
  51 #include <lustre_sec.h>
  52 #include "ldlm_internal.h"
  53
  54
  55 /* @priority: if non-zero, move the selected to the list head
  56  * @create: if zero, only search in existed connections
  57  */
  58 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  59                            int priority, int create)
  60 {
  61         struct ptlrpc_connection *ptlrpc_conn;
  62         struct obd_import_conn *imp_conn = NULL, *item;
  63         int rc = 0;
  64         ENTRY;
  65
  66         if (!create && !priority) {
  67                 CDEBUG(D_HA, "Nothing to do\n");
  68                 RETURN(-EINVAL);
  69         }
  70
  71         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
  72         if (!ptlrpc_conn) {
  73                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  74                 RETURN (-ENOENT);
  75         }
  76
  77         if (create) {
  78                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  79                 if (!imp_conn) {
  80                         GOTO(out_put, rc = -ENOMEM);
  81                 }
  82         }
  83
  84         spin_lock(&imp->imp_lock);
  85         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  86                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  87                         if (priority) {
  88                                 list_del(&item->oic_item);
  89                                 list_add(&item->oic_item, &imp->imp_conn_list);
  90                                 item->oic_last_attempt = 0;
  91                         }
  92                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  93                                imp, imp->imp_obd->obd_name, uuid->uuid,
  94                                (priority ? ", moved to head" : ""));
  95                         spin_unlock(&imp->imp_lock);
  96                         GOTO(out_free, rc = 0);
  97                 }
  98         }
  99         /* not found */
 100         if (create) {
 101                 imp_conn->oic_conn = ptlrpc_conn;
 102                 imp_conn->oic_uuid = *uuid;
 103                 item->oic_last_attempt = 0;
 104                 if (priority)
 105                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 106                 else
 107                         list_add_tail(&imp_conn->oic_item, &imp->imp_conn_list);
 108                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 109                        imp, imp->imp_obd->obd_name, uuid->uuid,
 110                        (priority ? "head" : "tail"));
 111         } else {
 112                 spin_unlock(&imp->imp_lock);
 113                 GOTO(out_free, rc = -ENOENT);
 114         }
 115
 116         spin_unlock(&imp->imp_lock);
 117         RETURN(0);
 118 out_free:
 119         if (imp_conn)
 120                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 121 out_put:
 122         ptlrpc_connection_put(ptlrpc_conn);
 123         RETURN(rc);
 124 }
 125
 126 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 127 {
 128         return import_set_conn(imp, uuid, 1, 0);
 129 }
 130
 131 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 132                            int priority)
 133 {
 134         return import_set_conn(imp, uuid, priority, 1);
 135 }
 136
 137 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 138 {
 139         struct obd_import_conn *imp_conn;
 140         struct obd_export *dlmexp;
 141         int rc = -ENOENT;
 142         ENTRY;
 143
 144         spin_lock(&imp->imp_lock);
 145         if (list_empty(&imp->imp_conn_list)) {
 146                 LASSERT(!imp->imp_connection);
 147                 GOTO(out, rc);
 148         }
 149
 150         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 151                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 152                         continue;
 153                 LASSERT(imp_conn->oic_conn);
 154
 155                 /* is current conn? */
 156                 if (imp_conn == imp->imp_conn_current) {
 157                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 158
 159                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 160                             imp->imp_state != LUSTRE_IMP_DISCON) {
 161                                 CERROR("can't remove current connection\n");
 162                                 GOTO(out, rc = -EBUSY);
 163                         }
 164
 165                         ptlrpc_connection_put(imp->imp_connection);
 166                         imp->imp_connection = NULL;
 167
 168                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 169                         if (dlmexp && dlmexp->exp_connection) {
 170                                 LASSERT(dlmexp->exp_connection ==
 171                                         imp_conn->oic_conn);
 172                                 ptlrpc_connection_put(dlmexp->exp_connection);
 173                                 dlmexp->exp_connection = NULL;
 174                         }
 175                 }
 176
 177                 list_del(&imp_conn->oic_item);
 178                 ptlrpc_connection_put(imp_conn->oic_conn);
 179                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 180                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 181                        imp, imp->imp_obd->obd_name, uuid->uuid);
 182                 rc = 0;
 183                 break;
 184         }
 185 out:
 186         spin_unlock(&imp->imp_lock);
 187         if (rc == -ENOENT)
 188                 CERROR("connection %s not found\n", uuid->uuid);
 189         RETURN(rc);
 190 }
 191
 192 static void destroy_import(struct obd_import *imp)
 193 {
 194         /* drop security policy instance after all rpc finished/aborted
 195          * to let all busy contexts be released. */
 196         class_import_get(imp);
 197         class_destroy_import(imp);
 198         sptlrpc_import_sec_put(imp);
 199         class_import_put(imp);
 200 }
 201
 202 /* configure an RPC client OBD device
 203  *
 204  * lcfg parameters:
 205  * 1 - client UUID
 206  * 2 - server UUID
 207  * 3 - inactive-on-startup
 208  */
 209 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 210 {
 211         struct client_obd *cli = &obddev->u.cli;
 212         struct obd_import *imp;
 213         struct obd_uuid server_uuid;
 214         int rq_portal, rp_portal, connect_op;
 215         char *name = obddev->obd_type->typ_name;
 216         int rc;
 217         ENTRY;
 218
 219         /* In a more perfect world, we would hang a ptlrpc_client off of
 220          * obd_type and just use the values from there. */
 221         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 222                 rq_portal = OST_REQUEST_PORTAL;
 223                 rp_portal = OSC_REPLY_PORTAL;
 224                 connect_op = OST_CONNECT;
 225         } else if (!strcmp(name, LUSTRE_MDC_NAME)) {
 226                 rq_portal = MDS_REQUEST_PORTAL;
 227                 rp_portal = MDC_REPLY_PORTAL;
 228                 connect_op = MDS_CONNECT;
 229         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 230                 rq_portal = MGS_REQUEST_PORTAL;
 231                 rp_portal = MGC_REPLY_PORTAL;
 232                 connect_op = MGS_CONNECT;
 233         } else {
 234                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 235                        name);
 236                 RETURN(-EINVAL);
 237         }
 238
 239         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 240                 CERROR("requires a TARGET UUID\n");
 241                 RETURN(-EINVAL);
 242         }
 243
 244         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 245                 CERROR("client UUID must be less than 38 characters\n");
 246                 RETURN(-EINVAL);
 247         }
 248
 249         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 250                 CERROR("setup requires a SERVER UUID\n");
 251                 RETURN(-EINVAL);
 252         }
 253
 254         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 255                 CERROR("target UUID must be less than 38 characters\n");
 256                 RETURN(-EINVAL);
 257         }
 258
 259         init_rwsem(&cli->cl_sem);
 260         sema_init(&cli->cl_mgc_sem, 1);
 261         sptlrpc_rule_set_init(&cli->cl_sptlrpc_rset);
 262         cli->cl_sec_part = LUSTRE_SP_ANY;
 263         cli->cl_conn_count = 0;
 264         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 265                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 266                      sizeof(server_uuid)));
 267
 268         cli->cl_dirty = 0;
 269         cli->cl_avail_grant = 0;
 270         /* FIXME: should limit this for the sum of all cl_dirty_max */
 271         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 272         if (cli->cl_dirty_max >> CFS_PAGE_SHIFT > num_physpages / 8)
 273                 cli->cl_dirty_max = num_physpages << (CFS_PAGE_SHIFT - 3);
 274         CFS_INIT_LIST_HEAD(&cli->cl_cache_waiters);
 275         CFS_INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 276         CFS_INIT_LIST_HEAD(&cli->cl_loi_write_list);
 277         CFS_INIT_LIST_HEAD(&cli->cl_loi_read_list);
 278         client_obd_list_lock_init(&cli->cl_loi_list_lock);
 279         cli->cl_r_in_flight = 0;
 280         cli->cl_w_in_flight = 0;
 281
 282         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 283         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 284         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 285         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 286         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 287         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 288         cfs_waitq_init(&cli->cl_destroy_waitq);
 289         atomic_set(&cli->cl_destroy_in_flight, 0);
 290 #ifdef ENABLE_CHECKSUM
 291         /* Turn on checksumming by default. */
 292         cli->cl_checksum = 1;
 293         /*
 294          * The supported checksum types will be worked out at connect time
 295          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 296          * through procfs.
 297          */
 298         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 299 #endif
 300         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 301
 302         /* This value may be changed at connect time in
 303            ptlrpc_connect_interpret. */
 304         cli->cl_max_pages_per_rpc = min((int)PTLRPC_MAX_BRW_PAGES,
 305                                         (int)(1024 * 1024 >> CFS_PAGE_SHIFT));
 306
 307         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 308                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
 309         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 128 /* MB */) {
 310                 cli->cl_max_rpcs_in_flight = 2;
 311         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 256 /* MB */) {
 312                 cli->cl_max_rpcs_in_flight = 3;
 313         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 512 /* MB */) {
 314                 cli->cl_max_rpcs_in_flight = 4;
 315         } else {
 316                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 317         }
 318
 319         rc = ldlm_get_ref();
 320         if (rc) {
 321                 CERROR("ldlm_get_ref failed: %d\n", rc);
 322                 GOTO(err, rc);
 323         }
 324
 325         ptlrpc_init_client(rq_portal, rp_portal, name,
 326                            &obddev->obd_ldlm_client);
 327
 328         imp = class_new_import(obddev);
 329         if (imp == NULL)
 330                 GOTO(err_ldlm, rc = -ENOENT);
 331         imp->imp_client = &obddev->obd_ldlm_client;
 332         imp->imp_connect_op = connect_op;
 333         imp->imp_initial_recov = 1;
 334         imp->imp_initial_recov_bk = 0;
 335         CFS_INIT_LIST_HEAD(&imp->imp_pinger_chain);
 336         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 337                LUSTRE_CFG_BUFLEN(lcfg, 1));
 338         class_import_put(imp);
 339
 340         rc = client_import_add_conn(imp, &server_uuid, 1);
 341         if (rc) {
 342                 CERROR("can't add initial connection\n");
 343                 GOTO(err_import, rc);
 344         }
 345
 346         cli->cl_import = imp;
 347         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 348         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 349         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 350
 351         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 352                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 353                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 354                                name, obddev->obd_name,
 355                                cli->cl_target_uuid.uuid);
 356                         spin_lock(&imp->imp_lock);
 357                         imp->imp_invalid = 1;
 358                         spin_unlock(&imp->imp_lock);
 359                 }
 360         }
 361
 362         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 363
 364         RETURN(rc);
 365
 366 err_import:
 367         class_destroy_import(imp);
 368 err_ldlm:
 369         ldlm_put_ref();
 370 err:
 371         RETURN(rc);
 372
 373 }
 374
 375 int client_obd_cleanup(struct obd_device *obddev)
 376 {
 377         ENTRY;
 378         sptlrpc_rule_set_free(&obddev->u.cli.cl_sptlrpc_rset);
 379         ldlm_put_ref();
 380         RETURN(0);
 381 }
 382
 383 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 384 int client_connect_import(const struct lu_env *env,
 385                           struct lustre_handle *dlm_handle,
 386                           struct obd_device *obd, struct obd_uuid *cluuid,
 387                           struct obd_connect_data *data, void *localdata)
 388 {
 389         struct client_obd *cli = &obd->u.cli;
 390         struct obd_import *imp = cli->cl_import;
 391         struct obd_export *exp;
 392         struct obd_connect_data *ocd;
 393         struct ldlm_namespace *to_be_freed = NULL;
 394         int rc;
 395         ENTRY;
 396
 397         down_write(&cli->cl_sem);
 398         rc = class_connect(dlm_handle, obd, cluuid);
 399         if (rc)
 400                 GOTO(out_sem, rc);
 401
 402         cli->cl_conn_count++;
 403         if (cli->cl_conn_count > 1)
 404                 GOTO(out_sem, rc);
 405         exp = class_conn2export(dlm_handle);
 406
 407         if (obd->obd_namespace != NULL)
 408                 CERROR("already have namespace!\n");
 409         obd->obd_namespace = ldlm_namespace_new(obd, obd->obd_name,
 410                                                 LDLM_NAMESPACE_CLIENT,
 411                                                 LDLM_NAMESPACE_GREEDY);
 412         if (obd->obd_namespace == NULL)
 413                 GOTO(out_disco, rc = -ENOMEM);
 414
 415         imp->imp_dlm_handle = *dlm_handle;
 416         rc = ptlrpc_init_import(imp);
 417         if (rc != 0)
 418                 GOTO(out_ldlm, rc);
 419
 420         ocd = &imp->imp_connect_data;
 421         if (data) {
 422                 *ocd = *data;
 423                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 424         }
 425
 426         rc = ptlrpc_connect_import(imp, NULL);
 427         if (rc != 0) {
 428                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 429                 GOTO(out_ldlm, rc);
 430         }
 431         LASSERT(exp->exp_connection);
 432
 433         if (data) {
 434                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 435                          ocd->ocd_connect_flags, "old "LPX64", new "LPX64"\n",
 436                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 437                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 438         }
 439
 440         ptlrpc_pinger_add_import(imp);
 441
 442         EXIT;
 443
 444         if (rc) {
 445 out_ldlm:
 446                 ldlm_namespace_free_prior(obd->obd_namespace, imp, 0);
 447                 to_be_freed = obd->obd_namespace;
 448                 obd->obd_namespace = NULL;
 449 out_disco:
 450                 cli->cl_conn_count--;
 451                 class_disconnect(exp);
 452         } else {
 453                 class_export_put(exp);
 454         }
 455 out_sem:
 456         up_write(&cli->cl_sem);
 457         if (to_be_freed)
 458                 ldlm_namespace_free_post(to_be_freed);
 459
 460         return rc;
 461 }
 462
 463 int client_disconnect_export(struct obd_export *exp)
 464 {
 465         struct obd_device *obd = class_exp2obd(exp);
 466         struct client_obd *cli;
 467         struct obd_import *imp;
 468         int rc = 0, err;
 469         struct ldlm_namespace *to_be_freed = NULL;
 470         ENTRY;
 471
 472         if (!obd) {
 473                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 474                        exp, exp ? exp->exp_handle.h_cookie : -1);
 475                 RETURN(-EINVAL);
 476         }
 477
 478         cli = &obd->u.cli;
 479         imp = cli->cl_import;
 480
 481         down_write(&cli->cl_sem);
 482         if (!cli->cl_conn_count) {
 483                 CERROR("disconnecting disconnected device (%s)\n",
 484                        obd->obd_name);
 485                 GOTO(out_sem, rc = -EINVAL);
 486         }
 487
 488         cli->cl_conn_count--;
 489         if (cli->cl_conn_count)
 490                 GOTO(out_no_disconnect, rc = 0);
 491
 492         /* Mark import deactivated now, so we don't try to reconnect if any
 493          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
 494          * fully deactivate the import, or that would drop all requests. */
 495         spin_lock(&imp->imp_lock);
 496         imp->imp_deactive = 1;
 497         spin_unlock(&imp->imp_lock);
 498
 499         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 500          * delete it regardless.  (It's safe to delete an import that was
 501          * never added.) */
 502         (void)ptlrpc_pinger_del_import(imp);
 503
 504         if (obd->obd_namespace != NULL) {
 505                 /* obd_force == local only */
 506                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 507                                        obd->obd_force ? LDLM_FL_LOCAL_ONLY:0,
 508                                        NULL);
 509                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 510                 to_be_freed = obd->obd_namespace;
 511         }
 512
 513         rc = ptlrpc_disconnect_import(imp, 0);
 514
 515         ptlrpc_invalidate_import(imp);
 516         /* set obd_namespace to NULL only after invalidate, because we can have
 517          * some connect requests in flight, and his need store a connect flags
 518          * in obd_namespace. bug 14260 */
 519         obd->obd_namespace = NULL;
 520
 521         ptlrpc_free_rq_pool(imp->imp_rq_pool);
 522         destroy_import(imp);
 523         cli->cl_import = NULL;
 524
 525         EXIT;
 526  out_no_disconnect:
 527         err = class_disconnect(exp);
 528         if (!rc && err)
 529                 rc = err;
 530  out_sem:
 531         up_write(&cli->cl_sem);
 532         if (to_be_freed)
 533                 ldlm_namespace_free_post(to_be_freed);
 534
 535         RETURN(rc);
 536 }
 537
 538 /* --------------------------------------------------------------------------
 539  * from old lib/target.c
 540  * -------------------------------------------------------------------------- */
 541
 542 int target_handle_reconnect(struct lustre_handle *conn, struct obd_export *exp,
 543                             struct obd_uuid *cluuid, int initial_conn)
 544 {
 545         ENTRY;
 546         if (exp->exp_connection && exp->exp_imp_reverse && !initial_conn) {
 547                 struct lustre_handle *hdl;
 548                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 549                 /* Might be a re-connect after a partition. */
 550                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 551                         CWARN("%s: %s reconnecting\n", exp->exp_obd->obd_name,
 552                               cluuid->uuid);
 553                         conn->cookie = exp->exp_handle.h_cookie;
 554                         /* target_handle_connect() treats EALREADY and
 555                          * -EALREADY differently.  EALREADY means we are
 556                          * doing a valid reconnect from the same client. */
 557                         RETURN(EALREADY);
 558                 } else {
 559                         CERROR("%s reconnecting from %s, "
 560                                "handle mismatch (ours "LPX64", theirs "
 561                                LPX64")\n", cluuid->uuid,
 562                                exp->exp_connection->c_remote_uuid.uuid,
 563                                hdl->cookie, conn->cookie);
 564                         memset(conn, 0, sizeof *conn);
 565                         /* target_handle_connect() treats EALREADY and
 566                          * -EALREADY differently.  -EALREADY is an error
 567                          * (same UUID, different handle). */
 568                         RETURN(-EALREADY);
 569                 }
 570         }
 571
 572         conn->cookie = exp->exp_handle.h_cookie;
 573         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
 574                cluuid->uuid, exp, conn->cookie);
 575         RETURN(0);
 576 }
 577
 578 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
 579                           int error)
 580 {
 581         struct obd_export *exp = cb_data;
 582
 583         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 584                obd->obd_name, exp->exp_client_uuid.uuid);
 585
 586         spin_lock(&exp->exp_lock);
 587         exp->exp_need_sync = 0;
 588         spin_unlock(&exp->exp_lock);
 589 }
 590 EXPORT_SYMBOL(target_client_add_cb);
 591 static void
 592 target_start_and_reset_recovery_timer(struct obd_device *obd,
 593                                       struct ptlrpc_request *req,
 594                                       int new_client);
 595
 596 int target_handle_connect(struct ptlrpc_request *req)
 597 {
 598         struct obd_device *target, *targref = NULL;
 599         struct obd_export *export = NULL;
 600         struct obd_import *revimp;
 601         struct lustre_handle conn;
 602         struct lustre_handle *tmp;
 603         struct obd_uuid tgtuuid;
 604         struct obd_uuid cluuid;
 605         struct obd_uuid remote_uuid;
 606         char *str;
 607         int rc = 0;
 608         int initial_conn = 0;
 609         struct obd_connect_data *data, *tmpdata;
 610         lnet_nid_t *client_nid = NULL;
 611         ENTRY;
 612
 613         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 614
 615         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 616         if (str == NULL) {
 617                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 618                 GOTO(out, rc = -EINVAL);
 619         }
 620
 621         obd_str2uuid(&tgtuuid, str);
 622         target = class_uuid2obd(&tgtuuid);
 623         if (!target)
 624                 target = class_name2obd(str);
 625
 626         if (!target || target->obd_stopping || !target->obd_set_up) {
 627                 LCONSOLE_ERROR_MSG(0x137, "UUID '%s' is not available "
 628                                    " for connect (%s)\n", str,
 629                                    !target ? "no target" :
 630                                    (target->obd_stopping ? "stopping" :
 631                                    "not set up"));
 632                 GOTO(out, rc = -ENODEV);
 633         }
 634
 635         if (target->obd_no_conn) {
 636                 LCONSOLE_WARN("%s: temporarily refusing client connection "
 637                               "from %s\n", target->obd_name,
 638                               libcfs_nid2str(req->rq_peer.nid));
 639                 GOTO(out, rc = -EAGAIN);
 640         }
 641
 642         /* Make sure the target isn't cleaned up while we're here. Yes,
 643            there's still a race between the above check and our incref here.
 644            Really, class_uuid2obd should take the ref. */
 645         targref = class_incref(target, __FUNCTION__, cfs_current());
 646
 647
 648         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
 649         if (str == NULL) {
 650                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
 651                 GOTO(out, rc = -EINVAL);
 652         }
 653
 654         obd_str2uuid(&cluuid, str);
 655
 656         /* XXX extract a nettype and format accordingly */
 657         switch (sizeof(lnet_nid_t)) {
 658                 /* NB the casts only avoid compiler warnings */
 659         case 8:
 660                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 661                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
 662                 break;
 663         case 4:
 664                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 665                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
 666                 break;
 667         default:
 668                 LBUG();
 669         }
 670
 671         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 672         if (tmp == NULL)
 673                 GOTO(out, rc = -EPROTO);
 674
 675         conn = *tmp;
 676
 677         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 678         if (!data)
 679                 GOTO(out, rc = -EPROTO);
 680
 681         rc = req_capsule_server_pack(&req->rq_pill);
 682         if (rc)
 683                 GOTO(out, rc);
 684
 685         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 686                 if (!data) {
 687                         DEBUG_REQ(D_WARNING, req, "Refusing old (unversioned) "
 688                                   "libclient connection attempt");
 689                         GOTO(out, rc = -EPROTO);
 690                 } else if (data->ocd_version < LUSTRE_VERSION_CODE -
 691                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
 692                            data->ocd_version > LUSTRE_VERSION_CODE +
 693                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
 694                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
 695                                   "libclient connection attempt",
 696                                   data->ocd_version < LUSTRE_VERSION_CODE ?
 697                                   "old" : "new",
 698                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
 699                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
 700                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
 701                                   OBD_OCD_VERSION_FIX(data->ocd_version));
 702                         data = req_capsule_server_sized_get(&req->rq_pill,
 703                                                         &RMF_CONNECT_DATA,
 704                                     offsetof(typeof(*data), ocd_version) +
 705                                              sizeof(data->ocd_version));
 706                         if (data) {
 707                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
 708                                 data->ocd_version = LUSTRE_VERSION_CODE;
 709                         }
 710                         GOTO(out, rc = -EPROTO);
 711                 }
 712         }
 713
 714         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL)
 715                 initial_conn = 1;
 716
 717         /* lctl gets a backstage, all-access pass. */
 718         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 719                 goto dont_check_exports;
 720
 721         spin_lock(&target->obd_dev_lock);
 722         export = lustre_hash_lookup(target->obd_uuid_hash, &cluuid);
 723
 724         if (export != NULL && export->exp_connecting) { /* bug 9635, et. al. */
 725                 CWARN("%s: exp %p already connecting\n",
 726                       export->exp_obd->obd_name, export);
 727                 class_export_put(export);
 728                 export = NULL;
 729                 rc = -EALREADY;
 730         } else if (export != NULL && export->exp_connection != NULL &&
 731                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
 732                 /* make darn sure this is coming from the same peer
 733                  * if the UUIDs matched */
 734                   CWARN("%s: cookie %s seen on new NID %s when "
 735                           "existing NID %s is already connected\n",
 736                         target->obd_name, cluuid.uuid,
 737                   libcfs_nid2str(req->rq_peer.nid),
 738                   libcfs_nid2str(export->exp_connection->c_peer.nid));
 739                   class_export_put(export);
 740                   export = NULL;
 741                   rc = -EALREADY;
 742         } else if (export != NULL) {
 743                 spin_lock(&export->exp_lock);
 744                 export->exp_connecting = 1;
 745                 spin_unlock(&export->exp_lock);
 746                 class_export_put(export);
 747                 spin_unlock(&target->obd_dev_lock);
 748                 LASSERT(export->exp_obd == target);
 749
 750                 rc = target_handle_reconnect(&conn, export, &cluuid, initial_conn);
 751         }
 752
 753         /* If we found an export, we already unlocked. */
 754         if (!export) {
 755                 spin_unlock(&target->obd_dev_lock);
 756                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
 757         } else if (req->rq_export == NULL &&
 758                    atomic_read(&export->exp_rpc_count) > 0) {
 759                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
 760                       target->obd_name, cluuid.uuid,
 761                       libcfs_nid2str(req->rq_peer.nid),
 762                       export, atomic_read(&export->exp_refcount));
 763                 GOTO(out, rc = -EBUSY);
 764         } else if (req->rq_export != NULL &&
 765                    (atomic_read(&export->exp_rpc_count) > 1)) {
 766                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
 767                       target->obd_name, cluuid.uuid,
 768                       libcfs_nid2str(req->rq_peer.nid),
 769                       export, atomic_read(&export->exp_rpc_count));
 770                 GOTO(out, rc = -EBUSY);
 771         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
 772                    !initial_conn) {
 773                 CERROR("%s: NID %s (%s) reconnected with 1 conn_cnt; "
 774                        "cookies not random?\n", target->obd_name,
 775                        libcfs_nid2str(req->rq_peer.nid), cluuid.uuid);
 776                 GOTO(out, rc = -EALREADY);
 777         } else {
 778                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
 779                 if (req->rq_export == NULL && initial_conn)
 780                        export->exp_last_request_time =
 781                                max(export->exp_last_request_time,
 782                                    (time_t)cfs_time_current_sec());
 783         }
 784
 785         if (rc < 0) {
 786                 GOTO(out, rc);
 787         }
 788
 789         CWARN("%s: connection from %s@%s %st"LPU64" exp %p cur %ld last %ld\n",
 790                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 791               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
 792               export, (long)cfs_time_current_sec(),
 793               export ? (long)export->exp_last_request_time : 0);
 794
 795         /* Tell the client if we're in recovery. */
 796         if (target->obd_recovering) {
 797                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 798                 /* If this is the first time a client connects,
 799                    reset the recovery timer */
 800                 if (rc == 0)
 801                         target_start_and_reset_recovery_timer(target, req,
 802                                                               !export);
 803         }
 804
 805         /* We want to handle EALREADY but *not* -EALREADY from
 806          * target_handle_reconnect(), return reconnection state in a flag */
 807         if (rc == EALREADY) {
 808                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 809                 rc = 0;
 810         } else {
 811                 LASSERT(rc == 0);
 812         }
 813
 814         /* Tell the client if we support replayable requests */
 815         if (target->obd_replayable)
 816                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 817         client_nid = &req->rq_peer.nid;
 818
 819         if (export == NULL) {
 820                 if (target->obd_recovering) {
 821                         cfs_time_t t;
 822
 823                         t = cfs_timer_deadline(&target->obd_recovery_timer);
 824                         t = cfs_time_sub(t, cfs_time_current());
 825                         CERROR("%s: denying connection for new client %s (%s): "
 826                                "%d clients in recovery for "CFS_TIME_T"s\n",
 827                                target->obd_name,
 828                                libcfs_nid2str(req->rq_peer.nid), cluuid.uuid,
 829                                target->obd_recoverable_clients,
 830                                cfs_duration_sec(t));
 831                         rc = -EBUSY;
 832                 } else {
 833 dont_check_exports:
 834                         rc = obd_connect(req->rq_svc_thread->t_env,
 835                                          &conn, target, &cluuid, data,
 836                                          client_nid);
 837                 }
 838         } else {
 839                 rc = obd_reconnect(req->rq_svc_thread->t_env,
 840                                    export, target, &cluuid, data, client_nid);
 841         }
 842         if (rc)
 843                 GOTO(out, rc);
 844         /* Return only the parts of obd_connect_data that we understand, so the
 845          * client knows that we don't understand the rest. */
 846         if (data) {
 847                  tmpdata = req_capsule_server_get(&req->rq_pill,
 848                                                   &RMF_CONNECT_DATA);
 849                   //data->ocd_connect_flags &= OBD_CONNECT_SUPPORTED;
 850                  *tmpdata = *data;
 851         }
 852
 853         /* If all else goes well, this is our RPC return code. */
 854         req->rq_status = 0;
 855
 856         lustre_msg_set_handle(req->rq_repmsg, &conn);
 857
 858         /* ownership of this export ref transfers to the request AFTER we
 859          * drop any previous reference the request had, but we don't want
 860          * that to go to zero before we get our new export reference. */
 861         export = class_conn2export(&conn);
 862         if (!export) {
 863                 DEBUG_REQ(D_ERROR, req, "Missing export!");
 864                 GOTO(out, rc = -ENODEV);
 865         }
 866
 867         /* If the client and the server are the same node, we will already
 868          * have an export that really points to the client's DLM export,
 869          * because we have a shared handles table.
 870          *
 871          * XXX this will go away when shaver stops sending the "connect" handle
 872          * in the real "remote handle" field of the request --phik 24 Apr 2003
 873          */
 874         if (req->rq_export != NULL)
 875                 class_export_put(req->rq_export);
 876
 877         req->rq_export = export;
 878
 879         spin_lock(&export->exp_lock);
 880         if (initial_conn) {
 881                 lustre_msg_set_conn_cnt(req->rq_repmsg, export->exp_conn_cnt + 1);
 882         } else if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
 883                 spin_unlock(&export->exp_lock);
 884                 CERROR("%s: %s already connected at higher conn_cnt: %d > %d\n",
 885                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 886                        export->exp_conn_cnt,
 887                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
 888
 889                 GOTO(out, rc = -EALREADY);
 890         }
 891         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
 892
 893         /* request from liblustre?  Don't evict it for not pinging. */
 894         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 895                 export->exp_libclient = 1;
 896                 spin_unlock(&export->exp_lock);
 897
 898                 spin_lock(&target->obd_dev_lock);
 899                 list_del_init(&export->exp_obd_chain_timed);
 900                 spin_unlock(&target->obd_dev_lock);
 901         } else {
 902                 spin_unlock(&export->exp_lock);
 903         }
 904
 905         if (export->exp_connection != NULL)
 906                 ptlrpc_connection_put(export->exp_connection);
 907         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
 908                                                        req->rq_self,
 909                                                        &remote_uuid);
 910
 911         spin_lock(&target->obd_dev_lock);
 912
 913         /* Export might be hashed already, e.g. if this is reconnect */
 914         if (hlist_unhashed(&export->exp_nid_hash))
 915                 lustre_hash_add(export->exp_obd->obd_nid_hash,
 916                                 &export->exp_connection->c_peer.nid,
 917                                 &export->exp_nid_hash);
 918
 919         spin_unlock(&target->obd_dev_lock);
 920
 921         spin_lock_bh(&target->obd_processing_task_lock);
 922         if (target->obd_recovering && !export->exp_in_recovery) {
 923                 spin_lock(&export->exp_lock);
 924                 export->exp_in_recovery = 1;
 925                 export->exp_req_replay_needed = 1;
 926                 export->exp_lock_replay_needed = 1;
 927                 spin_unlock(&export->exp_lock);
 928                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
 929                      && (data->ocd_transno == 0))
 930                         CWARN("Connect with zero transno!\n");
 931
 932                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
 933                      && data->ocd_transno < target->obd_next_recovery_transno)
 934                         target->obd_next_recovery_transno = data->ocd_transno;
 935                 target->obd_connected_clients++;
 936                 /* each connected client is counted as recoverable */
 937                 target->obd_recoverable_clients++;
 938                 atomic_inc(&target->obd_req_replay_clients);
 939                 atomic_inc(&target->obd_lock_replay_clients);
 940                 if (target->obd_connected_clients ==
 941                     target->obd_max_recoverable_clients)
 942                         wake_up(&target->obd_next_transno_waitq);
 943         }
 944         spin_unlock_bh(&target->obd_processing_task_lock);
 945         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 946         conn = *tmp;
 947
 948         if (export->exp_imp_reverse != NULL) {
 949                 /* destroyed import can be still referenced in ctxt */
 950                 obd_set_info_async(export, sizeof(KEY_REVIMP_UPD),
 951                                    KEY_REVIMP_UPD, 0, NULL, NULL);
 952
 953                 /* in some recovery senarios, previous ctx init rpc handled
 954                  * in sptlrpc_target_export_check() might be used to install
 955                  * a reverse ctx in this reverse import, and later OBD_CONNECT
 956                  * using the same gss ctx could reach here and following new
 957                  * reverse import. note all reverse ctx in new/old import are
 958                  * actually based on the same gss ctx. so we invalidate ctx
 959                  * here before destroy import, otherwise flush old import will
 960                  * lead to remote reverse ctx be destroied, thus the reverse
 961                  * ctx of new import will lost its peer.
 962                  * there might be a better way to deal with this???
 963                  */
 964                 sptlrpc_import_inval_all_ctx(export->exp_imp_reverse);
 965
 966                 destroy_import(export->exp_imp_reverse);
 967         }
 968
 969         /* for the rest part, we return -ENOTCONN in case of errors
 970          * in order to let client initialize connection again.
 971          */
 972         revimp = export->exp_imp_reverse = class_new_import(target);
 973         if (!revimp) {
 974                 CERROR("fail to alloc new reverse import.\n");
 975                 GOTO(out, rc = -ENOTCONN);
 976         }
 977
 978         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
 979         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
 980         revimp->imp_remote_handle = conn;
 981         revimp->imp_dlm_fake = 1;
 982         revimp->imp_state = LUSTRE_IMP_FULL;
 983
 984         /* unknown versions will be caught in
 985          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
 986         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
 987
 988         if ((export->exp_connect_flags & OBD_CONNECT_AT) &&
 989             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
 990                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 991         else
 992                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 993
 994         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx,
 995                                       req->rq_flvr.sf_rpc);
 996         if (rc) {
 997                 CERROR("Failed to get sec for reverse import: %d\n", rc);
 998                 export->exp_imp_reverse = NULL;
 999                 class_destroy_import(revimp);
1000         }
1001
1002         class_import_put(revimp);
1003 out:
1004         if (export) {
1005                 spin_lock(&export->exp_lock);
1006                 export->exp_connecting = 0;
1007                 spin_unlock(&export->exp_lock);
1008         }
1009         if (targref)
1010                 class_decref(targref, __FUNCTION__, cfs_current());
1011         if (rc)
1012                 req->rq_status = rc;
1013         RETURN(rc);
1014 }
1015
1016 int target_handle_disconnect(struct ptlrpc_request *req)
1017 {
1018         int rc;
1019         ENTRY;
1020
1021         rc = req_capsule_server_pack(&req->rq_pill);
1022         if (rc)
1023                 RETURN(rc);
1024
1025         /* keep the rq_export around so we can send the reply */
1026         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1027
1028         RETURN(0);
1029 }
1030
1031 void target_destroy_export(struct obd_export *exp)
1032 {
1033         /* exports created from last_rcvd data, and "fake"
1034            exports created by lctl don't have an import */
1035         if (exp->exp_imp_reverse != NULL)
1036                 destroy_import(exp->exp_imp_reverse);
1037
1038         /* We cancel locks at disconnect time, but this will catch any locks
1039          * granted in a race with recovery-induced disconnect. */
1040         if (exp->exp_obd->obd_namespace != NULL)
1041                 ldlm_cancel_locks_for_export(exp);
1042 }
1043
1044 /*
1045  * Recovery functions
1046  */
1047
1048 struct ptlrpc_request *ptlrpc_clone_req( struct ptlrpc_request *orig_req)
1049 {
1050         struct ptlrpc_request *copy_req;
1051         struct lustre_msg *copy_reqmsg;
1052         struct ptlrpc_user_desc *udesc = NULL;
1053
1054         OBD_ALLOC_PTR(copy_req);
1055         if (!copy_req)
1056                 return NULL;
1057         OBD_ALLOC(copy_reqmsg, orig_req->rq_reqlen);
1058         if (!copy_reqmsg){
1059                 OBD_FREE_PTR(copy_req);
1060                 return NULL;
1061         }
1062
1063         if (orig_req->rq_user_desc) {
1064                 int ngroups = orig_req->rq_user_desc->pud_ngroups;
1065
1066                 OBD_ALLOC(udesc, sptlrpc_user_desc_size(ngroups));
1067                 if (!udesc) {
1068                         OBD_FREE(copy_reqmsg, orig_req->rq_reqlen);
1069                         OBD_FREE_PTR(copy_req);
1070                         return NULL;
1071                 }
1072                 memcpy(udesc, orig_req->rq_user_desc,
1073                        sptlrpc_user_desc_size(ngroups));
1074         }
1075
1076         *copy_req = *orig_req;
1077         memcpy(copy_reqmsg, orig_req->rq_reqmsg, orig_req->rq_reqlen);
1078         copy_req->rq_reqmsg = copy_reqmsg;
1079         copy_req->rq_user_desc = udesc;
1080
1081         class_export_rpc_get(copy_req->rq_export);
1082         CFS_INIT_LIST_HEAD(&copy_req->rq_list);
1083         CFS_INIT_LIST_HEAD(&copy_req->rq_replay_list);
1084         sptlrpc_svc_ctx_addref(copy_req);
1085
1086         if (copy_req->rq_reply_state) {
1087                 /* the copied req takes over the reply state */
1088                 orig_req->rq_reply_state = NULL;
1089                 /* to catch further access */
1090                 orig_req->rq_repmsg = NULL;
1091                 orig_req->rq_replen = 0;
1092         }
1093
1094         return copy_req;
1095 }
1096
1097 void ptlrpc_free_clone(struct ptlrpc_request *req)
1098 {
1099         LASSERT(list_empty(&req->rq_replay_list));
1100
1101         ptlrpc_req_drop_rs(req);
1102         sptlrpc_svc_ctx_decref(req);
1103         class_export_rpc_put(req->rq_export);
1104         list_del(&req->rq_list);
1105
1106         if (req->rq_user_desc) {
1107                 int ngroups = req->rq_user_desc->pud_ngroups;
1108                 OBD_FREE(req->rq_user_desc, sptlrpc_user_desc_size(ngroups));
1109         }
1110         OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
1111         OBD_FREE_PTR(req);
1112 }
1113
1114 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1115 {
1116         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1117         struct obd_export     *exp = req->rq_export;
1118         struct ptlrpc_request *reqiter;
1119         int                    dup = 0;
1120
1121         LASSERT(exp);
1122
1123         spin_lock(&exp->exp_lock);
1124         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1125                             rq_replay_list) {
1126                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1127                         dup = 1;
1128                         break;
1129                 }
1130         }
1131
1132         if (dup) {
1133                 /* we expect it with RESENT and REPLAY flags */
1134                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1135                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1136                         CERROR("invalid flags %x of resent replay\n",
1137                                lustre_msg_get_flags(req->rq_reqmsg));
1138         } else {
1139                 list_add_tail(&req->rq_replay_list, &exp->exp_req_replay_queue);
1140         }
1141
1142         spin_unlock(&exp->exp_lock);
1143         return dup;
1144 }
1145
1146 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1147 {
1148         LASSERT(!list_empty(&req->rq_replay_list));
1149         LASSERT(req->rq_export);
1150
1151         spin_lock(&req->rq_export->exp_lock);
1152         list_del_init(&req->rq_replay_list);
1153         spin_unlock(&req->rq_export->exp_lock);
1154 }
1155
1156 #ifdef __KERNEL__
1157 static void target_finish_recovery(struct obd_device *obd)
1158 {
1159         ENTRY;
1160         LCONSOLE_INFO("%s: sending delayed replies to recovered clients\n",
1161                       obd->obd_name);
1162
1163         ldlm_reprocess_all_ns(obd->obd_namespace);
1164
1165         /* when recovery finished, cleanup orphans on mds and ost */
1166         if (OBT(obd) && OBP(obd, postrecov)) {
1167                 int rc = OBP(obd, postrecov)(obd);
1168                 LCONSOLE_WARN("%s: recovery %s: rc %d\n", obd->obd_name,
1169                               rc < 0 ? "failed" : "complete", rc);
1170         }
1171
1172         obd->obd_recovery_end = cfs_time_current_sec();
1173         EXIT;
1174 }
1175
1176 static void abort_req_replay_queue(struct obd_device *obd)
1177 {
1178         struct ptlrpc_request *req, *n;
1179
1180         list_for_each_entry_safe(req, n, &obd->obd_req_replay_queue, rq_list) {
1181                 DEBUG_REQ(D_WARNING, req, "aborted:");
1182                 req->rq_status = -ENOTCONN;
1183                 if (ptlrpc_error(req)) {
1184                         DEBUG_REQ(D_ERROR, req,
1185                                   "failed abort_req_reply; skipping");
1186                 }
1187                 target_exp_dequeue_req_replay(req);
1188                 ptlrpc_free_clone(req);
1189         }
1190 }
1191
1192 static void abort_lock_replay_queue(struct obd_device *obd)
1193 {
1194         struct ptlrpc_request *req, *n;
1195
1196         list_for_each_entry_safe(req, n, &obd->obd_lock_replay_queue, rq_list){
1197                 DEBUG_REQ(D_ERROR, req, "aborted:");
1198                 req->rq_status = -ENOTCONN;
1199                 if (ptlrpc_error(req)) {
1200                         DEBUG_REQ(D_ERROR, req,
1201                                   "failed abort_lock_reply; skipping");
1202                 }
1203                 ptlrpc_free_clone(req);
1204         }
1205 }
1206 #endif
1207
1208 /* Called from a cleanup function if the device is being cleaned up
1209    forcefully.  The exports should all have been disconnected already,
1210    the only thing left to do is
1211      - clear the recovery flags
1212      - cancel the timer
1213      - free queued requests and replies, but don't send replies
1214    Because the obd_stopping flag is set, no new requests should be received.
1215
1216 */
1217 void target_cleanup_recovery(struct obd_device *obd)
1218 {
1219         struct ptlrpc_request *req, *n;
1220         ENTRY;
1221
1222         LASSERT(obd->obd_stopping);
1223
1224         spin_lock_bh(&obd->obd_processing_task_lock);
1225         if (!obd->obd_recovering) {
1226                 spin_unlock_bh(&obd->obd_processing_task_lock);
1227                 EXIT;
1228                 return;
1229         }
1230         obd->obd_recovering = obd->obd_abort_recovery = 0;
1231         target_cancel_recovery_timer(obd);
1232         spin_unlock_bh(&obd->obd_processing_task_lock);
1233
1234         list_for_each_entry_safe(req, n, &obd->obd_req_replay_queue, rq_list) {
1235                 LASSERT (req->rq_reply_state == 0);
1236                 target_exp_dequeue_req_replay(req);
1237                 ptlrpc_free_clone(req);
1238         }
1239         list_for_each_entry_safe(req, n, &obd->obd_lock_replay_queue, rq_list){
1240                 LASSERT (req->rq_reply_state == 0);
1241                 ptlrpc_free_clone(req);
1242         }
1243         list_for_each_entry_safe(req, n, &obd->obd_final_req_queue, rq_list) {
1244                 LASSERT (req->rq_reply_state == 0);
1245                 ptlrpc_free_clone(req);
1246         }
1247
1248         EXIT;
1249 }
1250
1251 /* obd_processing_task_lock should be held */
1252 void target_cancel_recovery_timer(struct obd_device *obd)
1253 {
1254         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1255         cfs_timer_disarm(&obd->obd_recovery_timer);
1256 }
1257
1258 /* extend = 1 means require at least "duration" seconds left in the timer,
1259    extend = 0 means set the total duration (start_recovery_timer) */
1260 static void reset_recovery_timer(struct obd_device *obd, int duration,
1261                                  int extend)
1262 {
1263         cfs_time_t now = cfs_time_current_sec();
1264         cfs_duration_t left;
1265
1266         spin_lock_bh(&obd->obd_processing_task_lock);
1267         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1268                 spin_unlock_bh(&obd->obd_processing_task_lock);
1269                 return;
1270         }
1271
1272         left = cfs_time_sub(obd->obd_recovery_end, now);
1273
1274         if (extend && (duration > left))
1275                 obd->obd_recovery_timeout += duration - left;
1276         else if (!extend && (duration > obd->obd_recovery_timeout))
1277                 /* Track the client's largest expected replay time */
1278                 obd->obd_recovery_timeout = duration;
1279 #ifdef CRAY_XT3
1280         /*
1281          * If total recovery time already exceed the
1282          * obd_recovery_max_time, then CRAY XT3 will
1283          * abort the recovery
1284          */
1285         if(obd->obd_recovery_timeout > obd->obd_recovery_max_time)
1286                 obd->obd_recovery_timeout = obd->obd_recovery_max_time;
1287 #endif
1288         obd->obd_recovery_end = obd->obd_recovery_start +
1289                                 obd->obd_recovery_timeout;
1290         if (!cfs_timer_is_armed(&obd->obd_recovery_timer) ||
1291             cfs_time_before(now, obd->obd_recovery_end)) {
1292                 left = cfs_time_sub(obd->obd_recovery_end, now);
1293                 cfs_timer_arm(&obd->obd_recovery_timer, cfs_time_shift(left));
1294         }
1295         spin_unlock_bh(&obd->obd_processing_task_lock);
1296         CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
1297                obd->obd_name, (unsigned)left);
1298 }
1299
1300 static void check_and_start_recovery_timer(struct obd_device *obd)
1301 {
1302         spin_lock_bh(&obd->obd_processing_task_lock);
1303         if (cfs_timer_is_armed(&obd->obd_recovery_timer)) {
1304                 spin_unlock_bh(&obd->obd_processing_task_lock);
1305                 return;
1306         }
1307         CWARN("%s: starting recovery timer\n", obd->obd_name);
1308         obd->obd_recovery_start = cfs_time_current_sec();
1309         /* minimum */
1310         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1311         spin_unlock_bh(&obd->obd_processing_task_lock);
1312
1313         reset_recovery_timer(obd, obd->obd_recovery_timeout, 0);
1314 }
1315
1316 /* Reset the timer with each new client connection */
1317 /*
1318  * This timer is actually reconnect_timer, which is for making sure
1319  * the total recovery window is at least as big as my reconnect
1320  * attempt timing. So the initial recovery time_out will be set to
1321  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1322  * from client is bigger than this, then the recovery time_out will
1323  * be extend to make sure the client could be reconnected, in the
1324  * process, the timeout from the new client should be ignored.
1325  */
1326
1327 static void
1328 target_start_and_reset_recovery_timer(struct obd_device *obd,
1329                                       struct ptlrpc_request *req,
1330                                       int new_client)
1331 {
1332         int req_timeout = lustre_msg_get_timeout(req->rq_reqmsg);
1333
1334         /* teach server about old server's estimates */
1335         if (!new_client)
1336                 at_add(&req->rq_rqbd->rqbd_service->srv_at_estimate,
1337                        at_timeout2est(req_timeout));
1338
1339         check_and_start_recovery_timer(obd);
1340
1341         req_timeout *= OBD_RECOVERY_FACTOR;
1342         if (req_timeout > obd->obd_recovery_timeout && !new_client)
1343                 reset_recovery_timer(obd, req_timeout, 0);
1344 }
1345
1346 #ifdef __KERNEL__
1347 static int check_for_next_transno(struct obd_device *obd)
1348 {
1349         struct ptlrpc_request *req = NULL;
1350         int wake_up = 0, connected, completed, queue_len, max;
1351         __u64 next_transno, req_transno;
1352         ENTRY;
1353         spin_lock_bh(&obd->obd_processing_task_lock);
1354
1355         if (!list_empty(&obd->obd_req_replay_queue)) {
1356                 req = list_entry(obd->obd_req_replay_queue.next,
1357                                  struct ptlrpc_request, rq_list);
1358                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1359         } else {
1360                 req_transno = 0;
1361         }
1362
1363         max = obd->obd_max_recoverable_clients;
1364         connected = obd->obd_connected_clients;
1365         completed = connected - obd->obd_recoverable_clients;
1366         queue_len = obd->obd_requests_queued_for_recovery;
1367         next_transno = obd->obd_next_recovery_transno;
1368
1369         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1370                "req_transno: "LPU64", next_transno: "LPU64"\n",
1371                max, connected, completed, queue_len, req_transno, next_transno);
1372
1373         if (obd->obd_abort_recovery) {
1374                 CDEBUG(D_HA, "waking for aborted recovery\n");
1375                 wake_up = 1;
1376         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1377                 CDEBUG(D_HA, "waking for completed recovery\n");
1378                 wake_up = 1;
1379         } else if (req_transno == next_transno) {
1380                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1381                 wake_up = 1;
1382         } else if (queue_len + completed == max) {
1383                 /* handle gaps occured due to lost reply. It is allowed gaps
1384                  * because all clients are connected and there will be resend
1385                  * for missed transaction */
1386                 LASSERTF(req_transno >= next_transno,
1387                          "req_transno: "LPU64", next_transno: "LPU64"\n",
1388                          req_transno, next_transno);
1389
1390                 CDEBUG(req_transno > obd->obd_last_committed ? D_ERROR : D_HA,
1391                        "waking for skipped transno (skip: "LPD64
1392                        ", ql: %d, comp: %d, conn: %d, next: "LPD64")\n",
1393                        next_transno, queue_len, completed, connected, req_transno);
1394                 obd->obd_next_recovery_transno = req_transno;
1395                 wake_up = 1;
1396         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1397                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1398                        " by fail_lock, waking up ("LPD64")\n", next_transno);
1399                 obd->obd_next_recovery_transno = req_transno;
1400                 wake_up = 1;
1401         } else if (queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1402                 /* some clients haven't connected in time, but we can try
1403                  * to replay requests that demand on already committed ones
1404                  * also, we can replay first non-committed transation */
1405                 LASSERT(req_transno != 0);
1406                 if (req_transno == obd->obd_last_committed + 1) {
1407                         obd->obd_next_recovery_transno = req_transno;
1408                 } else if (req_transno > obd->obd_last_committed) {
1409                         /* can't continue recovery: have no needed transno */
1410                         obd->obd_abort_recovery = 1;
1411                         CDEBUG(D_ERROR, "abort due to missed clients. max: %d, "
1412                                "connected: %d, completed: %d, queue_len: %d, "
1413                                "req_transno: "LPU64", next_transno: "LPU64"\n",
1414                                max, connected, completed, queue_len,
1415                                req_transno, next_transno);
1416                 }
1417                 wake_up = 1;
1418         }
1419
1420         spin_unlock_bh(&obd->obd_processing_task_lock);
1421         return wake_up;
1422 }
1423
1424 static struct ptlrpc_request *target_next_replay_req(struct obd_device *obd)
1425 {
1426         struct l_wait_info lwi = { 0 };
1427         struct ptlrpc_request *req;
1428
1429         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1430                obd->obd_next_recovery_transno);
1431         l_wait_event(obd->obd_next_transno_waitq,
1432                      check_for_next_transno(obd), &lwi);
1433
1434         spin_lock_bh(&obd->obd_processing_task_lock);
1435         if (obd->obd_abort_recovery) {
1436                 req = NULL;
1437         } else if (!list_empty(&obd->obd_req_replay_queue)) {
1438                 req = list_entry(obd->obd_req_replay_queue.next,
1439                                  struct ptlrpc_request, rq_list);
1440                 target_exp_dequeue_req_replay(req);
1441                 list_del_init(&req->rq_list);
1442                 obd->obd_requests_queued_for_recovery--;
1443         } else {
1444                 req = NULL;
1445         }
1446         spin_unlock_bh(&obd->obd_processing_task_lock);
1447         RETURN(req);
1448 }
1449
1450 static int check_for_next_lock(struct obd_device *obd)
1451 {
1452         struct ptlrpc_request *req = NULL;
1453         int wake_up = 0;
1454
1455         spin_lock_bh(&obd->obd_processing_task_lock);
1456         if (!list_empty(&obd->obd_lock_replay_queue)) {
1457                 req = list_entry(obd->obd_lock_replay_queue.next,
1458                                  struct ptlrpc_request, rq_list);
1459                 CDEBUG(D_HA, "waking for next lock\n");
1460                 wake_up = 1;
1461         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1462                 CDEBUG(D_HA, "waking for completed lock replay\n");
1463                 wake_up = 1;
1464         } else if (obd->obd_abort_recovery) {
1465                 CDEBUG(D_HA, "waking for aborted recovery\n");
1466                 wake_up = 1;
1467         }
1468         spin_unlock_bh(&obd->obd_processing_task_lock);
1469
1470         return wake_up;
1471 }
1472
1473 static struct ptlrpc_request *target_next_replay_lock(struct obd_device *obd)
1474 {
1475         struct l_wait_info lwi = { 0 };
1476         struct ptlrpc_request *req;
1477
1478         CDEBUG(D_HA, "Waiting for lock\n");
1479         l_wait_event(obd->obd_next_transno_waitq,
1480                      check_for_next_lock(obd), &lwi);
1481
1482         spin_lock_bh(&obd->obd_processing_task_lock);
1483         if (obd->obd_abort_recovery) {
1484                 req = NULL;
1485         } else if (!list_empty(&obd->obd_lock_replay_queue)) {
1486                 req = list_entry(obd->obd_lock_replay_queue.next,
1487                                  struct ptlrpc_request, rq_list);
1488                 list_del_init(&req->rq_list);
1489         } else {
1490                 req = NULL;
1491         }
1492         spin_unlock_bh(&obd->obd_processing_task_lock);
1493         return req;
1494 }
1495
1496 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
1497 {
1498         struct ptlrpc_request *req;
1499
1500         spin_lock_bh(&obd->obd_processing_task_lock);
1501         if (!list_empty(&obd->obd_final_req_queue)) {
1502                 req = list_entry(obd->obd_final_req_queue.next,
1503                                  struct ptlrpc_request, rq_list);
1504                 list_del_init(&req->rq_list);
1505         } else {
1506                 req = NULL;
1507         }
1508         spin_unlock_bh(&obd->obd_processing_task_lock);
1509         return req;
1510 }
1511
1512 static inline int req_replay_done(struct obd_export *exp)
1513 {
1514         return (exp->exp_req_replay_needed == 0);
1515 }
1516
1517 static inline int lock_replay_done(struct obd_export *exp)
1518 {
1519         return (exp->exp_lock_replay_needed == 0);
1520 }
1521
1522 static inline int connect_done(struct obd_export *exp)
1523 {
1524         return (exp->exp_in_recovery != 0);
1525 }
1526
1527 static int check_for_clients(struct obd_device *obd)
1528 {
1529         if (obd->obd_abort_recovery)
1530                 return 1;
1531         LASSERT(obd->obd_connected_clients <= obd->obd_max_recoverable_clients);
1532         if (obd->obd_no_conn == 0 &&
1533             obd->obd_connected_clients == obd->obd_max_recoverable_clients)
1534                 return 1;
1535         return 0;
1536 }
1537
1538 static int handle_recovery_req(struct ptlrpc_thread *thread,
1539                                struct ptlrpc_request *req,
1540                                svc_handler_t handler)
1541 {
1542         int rc;
1543         ENTRY;
1544
1545         rc = lu_context_init(&req->rq_session, LCT_SESSION);
1546         if (rc) {
1547                 CERROR("Failure to initialize session: %d\n", rc);
1548                 return rc;
1549         }
1550         req->rq_session.lc_thread = thread;
1551         lu_context_enter(&req->rq_session);
1552         req->rq_svc_thread = thread;
1553         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
1554
1555         /* thread context */
1556         lu_context_enter(&thread->t_env->le_ctx);
1557         (void)handler(req);
1558         lu_context_exit(&thread->t_env->le_ctx);
1559
1560         lu_context_exit(&req->rq_session);
1561         lu_context_fini(&req->rq_session);
1562         /* don't reset timer for final stage */
1563         if (!req_replay_done(req->rq_export) ||
1564             !lock_replay_done(req->rq_export))
1565                 reset_recovery_timer(class_exp2obd(req->rq_export),
1566                        OBD_RECOVERY_FACTOR * AT_OFF ? obd_timeout :
1567                        at_get(&req->rq_rqbd->rqbd_service->srv_at_estimate), 1);
1568         ptlrpc_free_clone(req);
1569         RETURN(0);
1570 }
1571
1572 static void resume_recovery_timer(struct obd_device *obd)
1573 {
1574         /* to be safe, make it at least OBD_RECOVERY_FACTOR * obd_timeout */
1575         reset_recovery_timer(obd, OBD_RECOVERY_FACTOR * obd_timeout, 1);
1576 }
1577
1578 static int target_recovery_thread(void *arg)
1579 {
1580         struct obd_device *obd = arg;
1581         struct ptlrpc_request *req;
1582         struct target_recovery_data *trd = &obd->obd_recovery_data;
1583         struct l_wait_info lwi = { 0 };
1584         unsigned long delta;
1585         unsigned long flags;
1586         struct lu_env env;
1587         struct ptlrpc_thread fake_svc_thread, *thread = &fake_svc_thread;
1588         __u32 recov_ctx_tags = LCT_MD_THREAD;
1589         int rc = 0;
1590         ENTRY;
1591
1592         cfs_daemonize("tgt_recov");
1593
1594         SIGNAL_MASK_LOCK(current, flags);
1595         sigfillset(&current->blocked);
1596         RECALC_SIGPENDING;
1597         SIGNAL_MASK_UNLOCK(current, flags);
1598
1599         rc = lu_context_init(&env.le_ctx, recov_ctx_tags);
1600         if (rc)
1601                 RETURN(rc);
1602
1603         thread->t_env = &env;
1604         env.le_ctx.lc_thread = thread;
1605
1606         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
1607                current->pid);
1608         trd->trd_processing_task = current->pid;
1609
1610         obd->obd_recovering = 1;
1611         complete(&trd->trd_starting);
1612
1613         /* first of all, we have to know the first transno to replay */
1614         obd->obd_abort_recovery = 0;
1615         l_wait_event(obd->obd_next_transno_waitq,
1616                      check_for_clients(obd), &lwi);
1617
1618         spin_lock_bh(&obd->obd_processing_task_lock);
1619         target_cancel_recovery_timer(obd);
1620         spin_unlock_bh(&obd->obd_processing_task_lock);
1621
1622         /* If some clients haven't connected in time, evict them */
1623         if (obd->obd_abort_recovery) {
1624                 CWARN("Some clients haven't connect in time (%d/%d),"
1625                        "evict them\n", obd->obd_connected_clients,
1626                        obd->obd_max_recoverable_clients);
1627                 obd->obd_abort_recovery = obd->obd_stopping;
1628                 class_disconnect_stale_exports(obd, connect_done);
1629         }
1630         /* next stage: replay requests */
1631         delta = jiffies;
1632         obd->obd_req_replaying = 1;
1633         CDEBUG(D_INFO, "1: request replay stage - %d clients from t"LPU64"\n",
1634               atomic_read(&obd->obd_req_replay_clients),
1635               obd->obd_next_recovery_transno);
1636         resume_recovery_timer(obd);
1637         while ((req = target_next_replay_req(obd))) {
1638                 LASSERT(trd->trd_processing_task == current->pid);
1639                 DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s",
1640                           lustre_msg_get_transno(req->rq_reqmsg),
1641                           libcfs_nid2str(req->rq_peer.nid));
1642                 handle_recovery_req(thread, req,
1643                                     trd->trd_recovery_handler);
1644                 obd->obd_replayed_requests++;
1645                 spin_lock_bh(&obd->obd_processing_task_lock);
1646                 obd->obd_next_recovery_transno++;
1647                 spin_unlock_bh(&obd->obd_processing_task_lock);
1648         }
1649
1650         spin_lock_bh(&obd->obd_processing_task_lock);
1651         target_cancel_recovery_timer(obd);
1652         spin_unlock_bh(&obd->obd_processing_task_lock);
1653
1654         /* If some clients haven't replayed requests in time, evict them */
1655         if (obd->obd_abort_recovery) {
1656                 CDEBUG(D_ERROR, "req replay timed out, aborting ...\n");
1657                 obd->obd_abort_recovery = obd->obd_stopping;
1658                 class_disconnect_stale_exports(obd, req_replay_done);
1659                 abort_req_replay_queue(obd);
1660         }
1661
1662         /* The second stage: replay locks */
1663         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
1664                atomic_read(&obd->obd_lock_replay_clients));
1665         resume_recovery_timer(obd);
1666         while ((req = target_next_replay_lock(obd))) {
1667                 LASSERT(trd->trd_processing_task == current->pid);
1668                 DEBUG_REQ(D_HA|D_WARNING, req, "processing lock from %s: ",
1669                           libcfs_nid2str(req->rq_peer.nid));
1670                 handle_recovery_req(thread, req,
1671                                     trd->trd_recovery_handler);
1672                 obd->obd_replayed_locks++;
1673         }
1674
1675         spin_lock_bh(&obd->obd_processing_task_lock);
1676         target_cancel_recovery_timer(obd);
1677         spin_unlock_bh(&obd->obd_processing_task_lock);
1678         /* If some clients haven't replayed requests in time, evict them */
1679         if (obd->obd_abort_recovery) {
1680                 int stale;
1681                 CERROR("lock replay timed out, aborting ...\n");
1682                 obd->obd_abort_recovery = obd->obd_stopping;
1683                 stale = class_disconnect_stale_exports(obd, lock_replay_done);
1684                 abort_lock_replay_queue(obd);
1685         }
1686
1687         /* We drop recoverying flag to forward all new requests
1688          * to regular mds_handle() since now */
1689         spin_lock_bh(&obd->obd_processing_task_lock);
1690         obd->obd_recovering = obd->obd_abort_recovery = 0;
1691         spin_unlock_bh(&obd->obd_processing_task_lock);
1692         /* The third stage: reply on final pings */
1693         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
1694         while ((req = target_next_final_ping(obd))) {
1695                 LASSERT(trd->trd_processing_task == current->pid);
1696                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
1697                           libcfs_nid2str(req->rq_peer.nid));
1698                 handle_recovery_req(thread, req,
1699                                     trd->trd_recovery_handler);
1700         }
1701
1702         delta = (jiffies - delta) / HZ;
1703         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
1704               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
1705         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
1706         LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
1707         if (delta > obd_timeout * 2) {
1708                 CWARN("too long recovery - read logs\n");
1709                 libcfs_debug_dumplog();
1710         }
1711
1712         target_finish_recovery(obd);
1713
1714         lu_context_fini(&env.le_ctx);
1715         trd->trd_processing_task = 0;
1716         complete(&trd->trd_finishing);
1717         RETURN(rc);
1718 }
1719
1720 int target_start_recovery_thread(struct obd_device *obd, svc_handler_t handler)
1721 {
1722         int rc = 0;
1723         struct target_recovery_data *trd = &obd->obd_recovery_data;
1724
1725         memset(trd, 0, sizeof(*trd));
1726         init_completion(&trd->trd_starting);
1727         init_completion(&trd->trd_finishing);
1728         trd->trd_recovery_handler = handler;
1729
1730         if (kernel_thread(target_recovery_thread, obd, 0) > 0) {
1731                 wait_for_completion(&trd->trd_starting);
1732                 LASSERT(obd->obd_recovering != 0);
1733         } else
1734                 rc = -ECHILD;
1735
1736         return rc;
1737 }
1738
1739 void target_stop_recovery_thread(struct obd_device *obd)
1740 {
1741         spin_lock_bh(&obd->obd_processing_task_lock);
1742         if (obd->obd_recovery_data.trd_processing_task > 0) {
1743                 struct target_recovery_data *trd = &obd->obd_recovery_data;
1744                 CERROR("%s: Aborting recovery\n", obd->obd_name);
1745                 obd->obd_abort_recovery = 1;
1746                 wake_up(&obd->obd_next_transno_waitq);
1747                 spin_unlock_bh(&obd->obd_processing_task_lock);
1748                 wait_for_completion(&trd->trd_finishing);
1749         } else {
1750                 spin_unlock_bh(&obd->obd_processing_task_lock);
1751         }
1752 }
1753
1754 void target_recovery_fini(struct obd_device *obd)
1755 {
1756         class_disconnect_exports(obd);
1757         target_stop_recovery_thread(obd);
1758         target_cleanup_recovery(obd);
1759 }
1760 EXPORT_SYMBOL(target_recovery_fini);
1761
1762 static void target_recovery_expired(unsigned long castmeharder)
1763 {
1764         struct obd_device *obd = (struct obd_device *)castmeharder;
1765         LCONSOLE_WARN("%s: recovery timed out; %d clients never reconnected "
1766                       "after %lds (%d clients did)\n",
1767                       obd->obd_name, obd->obd_recoverable_clients,
1768                       cfs_time_current_sec()- obd->obd_recovery_start,
1769                       obd->obd_connected_clients);
1770         spin_lock_bh(&obd->obd_processing_task_lock);
1771         if (obd->obd_recovering)
1772                 obd->obd_abort_recovery = 1;
1773         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1774         spin_unlock_bh(&obd->obd_processing_task_lock);
1775 }
1776
1777 void target_recovery_init(struct obd_device *obd, svc_handler_t handler)
1778 {
1779         if (obd->obd_max_recoverable_clients == 0)
1780                 return;
1781
1782         CWARN("RECOVERY: service %s, %d recoverable clients, "
1783               "last_transno "LPU64"\n", obd->obd_name,
1784               obd->obd_max_recoverable_clients, obd->obd_last_committed);
1785         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
1786         obd->obd_recovery_start = 0;
1787         obd->obd_recovery_end = 0;
1788         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1789         /* bz13079: this should be set to desired value for ost but not for mds */
1790         obd->obd_recovery_max_time = OBD_RECOVERY_MAX_TIME;
1791         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
1792         target_start_recovery_thread(obd, handler);
1793 }
1794 EXPORT_SYMBOL(target_recovery_init);
1795
1796 #endif
1797
1798 int target_process_req_flags(struct obd_device *obd, struct ptlrpc_request *req)
1799 {
1800         struct obd_export *exp = req->rq_export;
1801         LASSERT(exp != NULL);
1802         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1803                 /* client declares he's ready to replay locks */
1804                 spin_lock_bh(&obd->obd_processing_task_lock);
1805                 if (exp->exp_req_replay_needed) {
1806                         LASSERT(atomic_read(&obd->obd_req_replay_clients) > 0);
1807                         spin_lock(&exp->exp_lock);
1808                         exp->exp_req_replay_needed = 0;
1809                         spin_unlock(&exp->exp_lock);
1810                         atomic_dec(&obd->obd_req_replay_clients);
1811                         LASSERT(obd->obd_recoverable_clients > 0);
1812                         obd->obd_recoverable_clients--;
1813                         if (atomic_read(&obd->obd_req_replay_clients) == 0)
1814                                 CDEBUG(D_HA, "all clients have replayed reqs\n");
1815                         wake_up(&obd->obd_next_transno_waitq);
1816                 }
1817                 spin_unlock_bh(&obd->obd_processing_task_lock);
1818         }
1819         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1820                 /* client declares he's ready to complete recovery
1821                  * so, we put the request on th final queue */
1822                 spin_lock_bh(&obd->obd_processing_task_lock);
1823                 if (exp->exp_lock_replay_needed) {
1824                         LASSERT(atomic_read(&obd->obd_lock_replay_clients) > 0);
1825                         spin_lock(&exp->exp_lock);
1826                         exp->exp_lock_replay_needed = 0;
1827                         spin_unlock(&exp->exp_lock);
1828                         atomic_dec(&obd->obd_lock_replay_clients);
1829                         if (atomic_read(&obd->obd_lock_replay_clients) == 0)
1830                                 CDEBUG(D_HA, "all clients have replayed locks\n");
1831                         wake_up(&obd->obd_next_transno_waitq);
1832                 }
1833                 spin_unlock_bh(&obd->obd_processing_task_lock);
1834         }
1835
1836         return 0;
1837 }
1838
1839 int target_queue_recovery_request(struct ptlrpc_request *req,
1840                                   struct obd_device *obd)
1841 {
1842         struct list_head *tmp;
1843         int inserted = 0;
1844         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1845
1846         ENTRY;
1847
1848         if (obd->obd_recovery_data.trd_processing_task == cfs_curproc_pid()) {
1849                 /* Processing the queue right now, don't re-add. */
1850                 RETURN(1);
1851         }
1852
1853         target_process_req_flags(obd, req);
1854
1855         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1856                 /* client declares he's ready to complete recovery
1857                  * so, we put the request on th final queue */
1858                 req = ptlrpc_clone_req(req);
1859                 if (req == NULL)
1860                         RETURN(-ENOMEM);
1861                 DEBUG_REQ(D_HA, req, "queue final req");
1862                 spin_lock_bh(&obd->obd_processing_task_lock);
1863                 if (obd->obd_recovering)
1864                         list_add_tail(&req->rq_list, &obd->obd_final_req_queue);
1865                 else {
1866                         spin_unlock_bh(&obd->obd_processing_task_lock);
1867                         ptlrpc_free_clone(req);
1868                         if (obd->obd_stopping) {
1869                                 RETURN(-ENOTCONN);
1870                         } else {
1871                                 RETURN(1);
1872                         }
1873                 }
1874                 spin_unlock_bh(&obd->obd_processing_task_lock);
1875                 RETURN(0);
1876         }
1877         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1878                 /* client declares he's ready to replay locks */
1879                 req = ptlrpc_clone_req(req);
1880                 if (req == NULL)
1881                         RETURN(-ENOMEM);
1882                 DEBUG_REQ(D_HA, req, "queue lock replay req");
1883                 spin_lock_bh(&obd->obd_processing_task_lock);
1884                 LASSERT(obd->obd_recovering);
1885                 /* usually due to recovery abort */
1886                 if (!req->rq_export->exp_in_recovery) {
1887                         spin_unlock_bh(&obd->obd_processing_task_lock);
1888                         ptlrpc_free_clone(req);
1889                         RETURN(-ENOTCONN);
1890                 }
1891                 LASSERT(req->rq_export->exp_lock_replay_needed);
1892                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
1893                 spin_unlock_bh(&obd->obd_processing_task_lock);
1894                 wake_up(&obd->obd_next_transno_waitq);
1895                 RETURN(0);
1896         }
1897
1898         /* CAVEAT EMPTOR: The incoming request message has been swabbed
1899          * (i.e. buflens etc are in my own byte order), but type-dependent
1900          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
1901
1902         if (!transno) {
1903                 CFS_INIT_LIST_HEAD(&req->rq_list);
1904                 DEBUG_REQ(D_HA, req, "not queueing");
1905                 RETURN(1);
1906         }
1907
1908         spin_lock_bh(&obd->obd_processing_task_lock);
1909
1910         /* If we're processing the queue, we want don't want to queue this
1911          * message.
1912          *
1913          * Also, if this request has a transno less than the one we're waiting
1914          * for, we should process it now.  It could (and currently always will)
1915          * be an open request for a descriptor that was opened some time ago.
1916          *
1917          * Also, a resent, replayed request that has already been
1918          * handled will pass through here and be processed immediately.
1919          */
1920         CWARN("Next recovery transno: "LPU64", current: "LPU64", replaying: %i\n",
1921               obd->obd_next_recovery_transno, transno, obd->obd_req_replaying);
1922         if (transno < obd->obd_next_recovery_transno && obd->obd_req_replaying) {
1923                 /* Processing the queue right now, don't re-add. */
1924                 LASSERT(list_empty(&req->rq_list));
1925                 spin_unlock_bh(&obd->obd_processing_task_lock);
1926                 RETURN(1);
1927         }
1928         spin_unlock_bh(&obd->obd_processing_task_lock);
1929
1930         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
1931                 RETURN(0);
1932
1933         req = ptlrpc_clone_req(req);
1934         if (req == NULL)
1935                 RETURN(-ENOMEM);
1936
1937         spin_lock_bh(&obd->obd_processing_task_lock);
1938         LASSERT(obd->obd_recovering);
1939         if (!req->rq_export->exp_in_recovery) {
1940                 spin_unlock_bh(&obd->obd_processing_task_lock);
1941                 ptlrpc_free_clone(req);
1942                 RETURN(-ENOTCONN);
1943         }
1944         LASSERT(req->rq_export->exp_req_replay_needed);
1945
1946         if (target_exp_enqueue_req_replay(req)) {
1947                 spin_unlock_bh(&obd->obd_processing_task_lock);
1948                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
1949                 ptlrpc_free_clone(req);
1950                 RETURN(0);
1951         }
1952
1953         /* XXX O(n^2) */
1954         list_for_each(tmp, &obd->obd_req_replay_queue) {
1955                 struct ptlrpc_request *reqiter =
1956                         list_entry(tmp, struct ptlrpc_request, rq_list);
1957
1958                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
1959                         list_add_tail(&req->rq_list, &reqiter->rq_list);
1960                         inserted = 1;
1961                         break;
1962                 }
1963
1964                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
1965                              transno)) {
1966                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
1967                                   "has been claimed by another client");
1968                         spin_unlock_bh(&obd->obd_processing_task_lock);
1969                         target_exp_dequeue_req_replay(req);
1970                         ptlrpc_free_clone(req);
1971                         RETURN(0);
1972                 }
1973         }
1974
1975         if (!inserted)
1976                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
1977
1978         obd->obd_requests_queued_for_recovery++;
1979         wake_up(&obd->obd_next_transno_waitq);
1980         spin_unlock_bh(&obd->obd_processing_task_lock);
1981         RETURN(0);
1982 }
1983
1984 struct obd_device * target_req2obd(struct ptlrpc_request *req)
1985 {
1986         return req->rq_export->exp_obd;
1987 }
1988
1989 static inline struct ldlm_pool *ldlm_exp2pl(struct obd_export *exp)
1990 {
1991         LASSERT(exp != NULL);
1992         return &exp->exp_obd->obd_namespace->ns_pool;
1993 }
1994
1995 /**
1996  * Packs current SLV and Limit into \a req.
1997  */
1998 int target_pack_pool_reply(struct ptlrpc_request *req)
1999 {
2000         struct obd_device *obd;
2001         ENTRY;
2002
2003         /*
2004          * Check that we still have all structures alive as this may
2005          * be some late rpc in shutdown time.
2006          */
2007         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2008                      !exp_connect_lru_resize(req->rq_export))) {
2009                 lustre_msg_set_slv(req->rq_repmsg, 0);
2010                 lustre_msg_set_limit(req->rq_repmsg, 0);
2011                 RETURN(0);
2012         }
2013
2014         /*
2015          * OBD is alive here as export is alive, which we checked above.
2016          */
2017         obd = req->rq_export->exp_obd;
2018
2019         read_lock(&obd->obd_pool_lock);
2020         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2021         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2022         read_unlock(&obd->obd_pool_lock);
2023
2024         RETURN(0);
2025 }
2026
2027 int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
2028 {
2029         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2030                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2031                 return (-ECOMM);
2032         }
2033
2034         if (unlikely(rc)) {
2035                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
2036                 req->rq_status = rc;
2037                 return (ptlrpc_send_error(req, 1));
2038         } else {
2039                 DEBUG_REQ(D_NET, req, "sending reply");
2040         }
2041
2042         return (ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT));
2043 }
2044
2045 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2046 {
2047         int                        netrc;
2048         struct ptlrpc_reply_state *rs;
2049         struct obd_device         *obd;
2050         struct obd_export         *exp;
2051         struct ptlrpc_service     *svc;
2052         ENTRY;
2053
2054         if (req->rq_no_reply) {
2055                 EXIT;
2056                 return;
2057         }
2058
2059         svc = req->rq_rqbd->rqbd_service;
2060         rs = req->rq_reply_state;
2061         if (rs == NULL || !rs->rs_difficult) {
2062                 /* no notifiers */
2063                 target_send_reply_msg (req, rc, fail_id);
2064                 EXIT;
2065                 return;
2066         }
2067
2068         /* must be an export if locks saved */
2069         LASSERT (req->rq_export != NULL);
2070         /* req/reply consistent */
2071         LASSERT (rs->rs_service == svc);
2072
2073         /* "fresh" reply */
2074         LASSERT (!rs->rs_scheduled);
2075         LASSERT (!rs->rs_scheduled_ever);
2076         LASSERT (!rs->rs_handled);
2077         LASSERT (!rs->rs_on_net);
2078         LASSERT (rs->rs_export == NULL);
2079         LASSERT (list_empty(&rs->rs_obd_list));
2080         LASSERT (list_empty(&rs->rs_exp_list));
2081
2082         exp = class_export_get (req->rq_export);
2083         obd = exp->exp_obd;
2084
2085         /* disable reply scheduling onto srv_reply_queue while I'm setting up */
2086         rs->rs_scheduled = 1;
2087         rs->rs_on_net    = 1;
2088         rs->rs_xid       = req->rq_xid;
2089         rs->rs_transno   = req->rq_transno;
2090         rs->rs_export    = exp;
2091
2092         spin_lock(&obd->obd_uncommitted_replies_lock);
2093
2094         CDEBUG(D_NET, "rs transno = "LPU64", last committed = "LPU64"\n",
2095                rs->rs_transno, obd->obd_last_committed);
2096         if (rs->rs_transno > obd->obd_last_committed) {
2097                 /* not committed already */
2098                 list_add_tail (&rs->rs_obd_list,
2099                                &obd->obd_uncommitted_replies);
2100         }
2101
2102         spin_unlock (&obd->obd_uncommitted_replies_lock);
2103         spin_lock (&exp->exp_lock);
2104
2105         list_add_tail (&rs->rs_exp_list, &exp->exp_outstanding_replies);
2106
2107         spin_unlock(&exp->exp_lock);
2108
2109         netrc = target_send_reply_msg (req, rc, fail_id);
2110
2111         spin_lock(&svc->srv_lock);
2112
2113         svc->srv_n_difficult_replies++;
2114
2115         if (netrc != 0) {
2116                 /* error sending: reply is off the net.  Also we need +1
2117                  * reply ref until ptlrpc_server_handle_reply() is done
2118                  * with the reply state (if the send was successful, there
2119                  * would have been +1 ref for the net, which
2120                  * reply_out_callback leaves alone) */
2121                 rs->rs_on_net = 0;
2122                 ptlrpc_rs_addref(rs);
2123                 atomic_inc (&svc->srv_outstanding_replies);
2124         }
2125
2126         if (rs->rs_transno <= obd->obd_last_committed ||
2127             (!rs->rs_on_net && !rs->rs_no_ack) ||
2128              list_empty(&rs->rs_exp_list) ||     /* completed already */
2129              list_empty(&rs->rs_obd_list)) {
2130                 CDEBUG(D_HA, "Schedule reply immediately\n");
2131                 list_add_tail (&rs->rs_list, &svc->srv_reply_queue);
2132                 cfs_waitq_signal (&svc->srv_waitq);
2133         } else {
2134                 list_add (&rs->rs_list, &svc->srv_active_replies);
2135                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
2136         }
2137
2138         spin_unlock(&svc->srv_lock);
2139         EXIT;
2140 }
2141
2142 int target_handle_ping(struct ptlrpc_request *req)
2143 {
2144         obd_ping(req->rq_export);
2145         return req_capsule_server_pack(&req->rq_pill);
2146 }
2147
2148 void target_committed_to_req(struct ptlrpc_request *req)
2149 {
2150         struct obd_device *obd;
2151
2152         if (req == NULL || req->rq_export == NULL)
2153                 return;
2154
2155         obd = req->rq_export->exp_obd;
2156         if (obd == NULL)
2157                 return;
2158
2159         if (!obd->obd_no_transno && req->rq_repmsg != NULL)
2160                 lustre_msg_set_last_committed(req->rq_repmsg,
2161                                               obd->obd_last_committed);
2162         else
2163                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2164                           "%d)", obd->obd_no_transno, req->rq_repmsg == NULL);
2165
2166         CDEBUG(D_INFO, "last_committed "LPU64", transno "LPU64", xid "LPU64"\n",
2167                obd->obd_last_committed, req->rq_transno, req->rq_xid);
2168 }
2169
2170 EXPORT_SYMBOL(target_committed_to_req);
2171
2172 #ifdef HAVE_QUOTA_SUPPORT
2173 int target_handle_qc_callback(struct ptlrpc_request *req)
2174 {
2175         struct obd_quotactl *oqctl;
2176         struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
2177
2178         oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2179         if (oqctl == NULL)
2180                 RETURN(-EPROTO);
2181
2182         cli->cl_qchk_stat = oqctl->qc_stat;
2183
2184         return 0;
2185 }
2186
2187 int target_handle_dqacq_callback(struct ptlrpc_request *req)
2188 {
2189 #ifdef __KERNEL__
2190         struct obd_device *obd = req->rq_export->exp_obd;
2191         struct obd_device *master_obd;
2192         struct lustre_quota_ctxt *qctxt;
2193         struct qunit_data *qdata;
2194         void* rep;
2195         struct qunit_data_old *qdata_old;
2196         int rc = 0;
2197         ENTRY;
2198
2199         rc = req_capsule_server_pack(&req->rq_pill);
2200         if (rc) {
2201                 CERROR("packing reply failed!: rc = %d\n", rc);
2202                 RETURN(rc);
2203         }
2204
2205         LASSERT(req->rq_export);
2206
2207         /* fixed for bug10707 */
2208         if ((req->rq_export->exp_connect_flags & OBD_CONNECT_QUOTA64) &&
2209             !OBD_FAIL_CHECK(OBD_FAIL_QUOTA_QD_COUNT_32BIT)) {
2210                 CDEBUG(D_QUOTA, "qd_count is 64bit!\n");
2211                 rep = req_capsule_server_get(&req->rq_pill,
2212                                              &RMF_QUNIT_DATA);
2213                 LASSERT(rep);
2214                 qdata = req_capsule_client_swab_get(&req->rq_pill,
2215                                                     &RMF_QUNIT_DATA,
2216                                           (void*)lustre_swab_qdata);
2217         } else {
2218                 CDEBUG(D_QUOTA, "qd_count is 32bit!\n");
2219                 rep = req_capsule_server_get(&req->rq_pill, &RMF_QUNIT_DATA);
2220                 LASSERT(rep);
2221                 qdata_old = req_capsule_client_swab_get(&req->rq_pill,
2222                                                         &RMF_QUNIT_DATA,
2223                                            (void*)lustre_swab_qdata_old);
2224                 qdata = lustre_quota_old_to_new(qdata_old);
2225         }
2226
2227         if (qdata == NULL)
2228                 RETURN(-EPROTO);
2229
2230         /* we use the observer */
2231         LASSERT(obd->obd_observer && obd->obd_observer->obd_observer);
2232         master_obd = obd->obd_observer->obd_observer;
2233         qctxt = &master_obd->u.obt.obt_qctxt;
2234
2235         LASSERT(qctxt->lqc_handler);
2236         rc = qctxt->lqc_handler(master_obd, qdata,
2237                                 lustre_msg_get_opc(req->rq_reqmsg));
2238         if (rc && rc != -EDQUOT)
2239                 CDEBUG(rc == -EBUSY  ? D_QUOTA : D_ERROR,
2240                        "dqacq failed! (rc:%d)\n", rc);
2241
2242         /* the qd_count might be changed in lqc_handler */
2243         if ((req->rq_export->exp_connect_flags & OBD_CONNECT_QUOTA64) &&
2244             !OBD_FAIL_CHECK(OBD_FAIL_QUOTA_QD_COUNT_32BIT)) {
2245                 memcpy(rep, qdata, sizeof(*qdata));
2246         } else {
2247                 qdata_old = lustre_quota_new_to_old(qdata);
2248                 memcpy(rep, qdata_old, sizeof(*qdata_old));
2249         }
2250         req->rq_status = rc;
2251         rc = ptlrpc_reply(req);
2252
2253         RETURN(rc);
2254 #else
2255         return 0;
2256 #endif /* !__KERNEL__ */
2257 }
2258 #endif /* HAVE_QUOTA_SUPPORT */
2259
2260 ldlm_mode_t lck_compat_array[] = {
2261         [LCK_EX] LCK_COMPAT_EX,
2262         [LCK_PW] LCK_COMPAT_PW,
2263         [LCK_PR] LCK_COMPAT_PR,
2264         [LCK_CW] LCK_COMPAT_CW,
2265         [LCK_CR] LCK_COMPAT_CR,
2266         [LCK_NL] LCK_COMPAT_NL,
2267         [LCK_GROUP] LCK_COMPAT_GROUP,
2268         [LCK_COS] LCK_COMPAT_COS,
2269 };
2270
2271 /**
2272  * Rather arbitrary mapping from LDLM error codes to errno values. This should
2273  * not escape to the user level.
2274  */
2275 int ldlm_error2errno(ldlm_error_t error)
2276 {
2277         int result;
2278
2279         switch (error) {
2280         case ELDLM_OK:
2281                 result = 0;
2282                 break;
2283         case ELDLM_LOCK_CHANGED:
2284                 result = -ESTALE;
2285                 break;
2286         case ELDLM_LOCK_ABORTED:
2287                 result = -ENAVAIL;
2288                 break;
2289         case ELDLM_LOCK_REPLACED:
2290                 result = -ESRCH;
2291                 break;
2292         case ELDLM_NO_LOCK_DATA:
2293                 result = -ENOENT;
2294                 break;
2295         case ELDLM_NAMESPACE_EXISTS:
2296                 result = -EEXIST;
2297                 break;
2298         case ELDLM_BAD_NAMESPACE:
2299                 result = -EBADF;
2300                 break;
2301         default:
2302                 if (((int)error) < 0)  /* cast to signed type */
2303                         result = error; /* as ldlm_error_t can be unsigned */
2304                 else {
2305                         CERROR("Invalid DLM result code: %i\n", error);
2306                         result = -EPROTO;
2307                 }
2308         }
2309         return result;
2310 }
2311 EXPORT_SYMBOL(ldlm_error2errno);
2312
2313 /**
2314  * Dual to ldlm_error2errno(): maps errno values back to ldlm_error_t.
2315  */
2316 ldlm_error_t ldlm_errno2error(int err_no)
2317 {
2318         int error;
2319
2320         switch (err_no) {
2321         case 0:
2322                 error = ELDLM_OK;
2323                 break;
2324         case -ESTALE:
2325                 error = ELDLM_LOCK_CHANGED;
2326                 break;
2327         case -ENAVAIL:
2328                 error = ELDLM_LOCK_ABORTED;
2329                 break;
2330         case -ESRCH:
2331                 error = ELDLM_LOCK_REPLACED;
2332                 break;
2333         case -ENOENT:
2334                 error = ELDLM_NO_LOCK_DATA;
2335                 break;
2336         case -EEXIST:
2337                 error = ELDLM_NAMESPACE_EXISTS;
2338                 break;
2339         case -EBADF:
2340                 error = ELDLM_BAD_NAMESPACE;
2341                 break;
2342         default:
2343                 error = err_no;
2344         }
2345         return error;
2346 }
2347 EXPORT_SYMBOL(ldlm_errno2error);
2348