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 /* @priority: if non-zero, move the selected to the list head
  55  * @create: if zero, only search in existed connections
  56  */
  57 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  58                            int priority, int create)
  59 {
  60         struct ptlrpc_connection *ptlrpc_conn;
  61         struct obd_import_conn *imp_conn = NULL, *item;
  62         int rc = 0;
  63         ENTRY;
  64
  65         if (!create && !priority) {
  66                 CDEBUG(D_HA, "Nothing to do\n");
  67                 RETURN(-EINVAL);
  68         }
  69
  70         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
  71         if (!ptlrpc_conn) {
  72                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  73                 RETURN (-ENOENT);
  74         }
  75
  76         if (create) {
  77                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  78                 if (!imp_conn) {
  79                         GOTO(out_put, rc = -ENOMEM);
  80                 }
  81         }
  82
  83         spin_lock(&imp->imp_lock);
  84         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  85                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  86                         if (priority) {
  87                                 list_del(&item->oic_item);
  88                                 list_add(&item->oic_item, &imp->imp_conn_list);
  89                                 item->oic_last_attempt = 0;
  90                         }
  91                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  92                                imp, imp->imp_obd->obd_name, uuid->uuid,
  93                                (priority ? ", moved to head" : ""));
  94                         spin_unlock(&imp->imp_lock);
  95                         GOTO(out_free, rc = 0);
  96                 }
  97         }
  98         /* not found */
  99         if (create) {
 100                 imp_conn->oic_conn = ptlrpc_conn;
 101                 imp_conn->oic_uuid = *uuid;
 102                 item->oic_last_attempt = 0;
 103                 if (priority)
 104                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 105                 else
 106                         list_add_tail(&imp_conn->oic_item, &imp->imp_conn_list);
 107                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 108                        imp, imp->imp_obd->obd_name, uuid->uuid,
 109                        (priority ? "head" : "tail"));
 110         } else {
 111                 spin_unlock(&imp->imp_lock);
 112                 GOTO(out_free, rc = -ENOENT);
 113         }
 114
 115         spin_unlock(&imp->imp_lock);
 116         RETURN(0);
 117 out_free:
 118         if (imp_conn)
 119                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 120 out_put:
 121         ptlrpc_connection_put(ptlrpc_conn);
 122         RETURN(rc);
 123 }
 124
 125 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 126 {
 127         return import_set_conn(imp, uuid, 1, 0);
 128 }
 129
 130 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 131                            int priority)
 132 {
 133         return import_set_conn(imp, uuid, priority, 1);
 134 }
 135
 136 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 137 {
 138         struct obd_import_conn *imp_conn;
 139         struct obd_export *dlmexp;
 140         int rc = -ENOENT;
 141         ENTRY;
 142
 143         spin_lock(&imp->imp_lock);
 144         if (list_empty(&imp->imp_conn_list)) {
 145                 LASSERT(!imp->imp_connection);
 146                 GOTO(out, rc);
 147         }
 148
 149         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 150                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 151                         continue;
 152                 LASSERT(imp_conn->oic_conn);
 153
 154                 /* is current conn? */
 155                 if (imp_conn == imp->imp_conn_current) {
 156                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 157
 158                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 159                             imp->imp_state != LUSTRE_IMP_DISCON) {
 160                                 CERROR("can't remove current connection\n");
 161                                 GOTO(out, rc = -EBUSY);
 162                         }
 163
 164                         ptlrpc_connection_put(imp->imp_connection);
 165                         imp->imp_connection = NULL;
 166
 167                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 168                         if (dlmexp && dlmexp->exp_connection) {
 169                                 LASSERT(dlmexp->exp_connection ==
 170                                         imp_conn->oic_conn);
 171                                 ptlrpc_connection_put(dlmexp->exp_connection);
 172                                 dlmexp->exp_connection = NULL;
 173                         }
 174                 }
 175
 176                 list_del(&imp_conn->oic_item);
 177                 ptlrpc_connection_put(imp_conn->oic_conn);
 178                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 179                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 180                        imp, imp->imp_obd->obd_name, uuid->uuid);
 181                 rc = 0;
 182                 break;
 183         }
 184 out:
 185         spin_unlock(&imp->imp_lock);
 186         if (rc == -ENOENT)
 187                 CERROR("connection %s not found\n", uuid->uuid);
 188         RETURN(rc);
 189 }
 190
 191 static void destroy_import(struct obd_import *imp)
 192 {
 193         /* drop security policy instance after all rpc finished/aborted
 194          * to let all busy contexts be released. */
 195         class_import_get(imp);
 196         class_destroy_import(imp);
 197         sptlrpc_import_sec_put(imp);
 198         class_import_put(imp);
 199 }
 200
 201 /* configure an RPC client OBD device
 202  *
 203  * lcfg parameters:
 204  * 1 - client UUID
 205  * 2 - server UUID
 206  * 3 - inactive-on-startup
 207  */
 208 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 209 {
 210         struct client_obd *cli = &obddev->u.cli;
 211         struct obd_import *imp;
 212         struct obd_uuid server_uuid;
 213         int rq_portal, rp_portal, connect_op;
 214         char *name = obddev->obd_type->typ_name;
 215         int rc;
 216         ENTRY;
 217
 218         /* In a more perfect world, we would hang a ptlrpc_client off of
 219          * obd_type and just use the values from there. */
 220         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 221                 rq_portal = OST_REQUEST_PORTAL;
 222                 rp_portal = OSC_REPLY_PORTAL;
 223                 connect_op = OST_CONNECT;
 224                 cli->cl_sp_me = LUSTRE_SP_CLI;
 225                 cli->cl_sp_to = LUSTRE_SP_OST;
 226         } else if (!strcmp(name, LUSTRE_MDC_NAME)) {
 227                 rq_portal = MDS_REQUEST_PORTAL;
 228                 rp_portal = MDC_REPLY_PORTAL;
 229                 connect_op = MDS_CONNECT;
 230                 cli->cl_sp_me = LUSTRE_SP_CLI;
 231                 cli->cl_sp_to = LUSTRE_SP_MDT;
 232         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 233                 rq_portal = MGS_REQUEST_PORTAL;
 234                 rp_portal = MGC_REPLY_PORTAL;
 235                 connect_op = MGS_CONNECT;
 236                 cli->cl_sp_me = LUSTRE_SP_MGC;
 237                 cli->cl_sp_to = LUSTRE_SP_MGS;
 238         } else {
 239                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 240                        name);
 241                 RETURN(-EINVAL);
 242         }
 243
 244         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 245                 CERROR("requires a TARGET UUID\n");
 246                 RETURN(-EINVAL);
 247         }
 248
 249         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 250                 CERROR("client UUID must be less than 38 characters\n");
 251                 RETURN(-EINVAL);
 252         }
 253
 254         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 255                 CERROR("setup requires a SERVER UUID\n");
 256                 RETURN(-EINVAL);
 257         }
 258
 259         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 260                 CERROR("target UUID must be less than 38 characters\n");
 261                 RETURN(-EINVAL);
 262         }
 263
 264         init_rwsem(&cli->cl_sem);
 265         sema_init(&cli->cl_mgc_sem, 1);
 266         cli->cl_conn_count = 0;
 267         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 268                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 269                      sizeof(server_uuid)));
 270
 271         cli->cl_dirty = 0;
 272         cli->cl_avail_grant = 0;
 273         /* FIXME: should limit this for the sum of all cl_dirty_max */
 274         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 275         if (cli->cl_dirty_max >> CFS_PAGE_SHIFT > num_physpages / 8)
 276                 cli->cl_dirty_max = num_physpages << (CFS_PAGE_SHIFT - 3);
 277         CFS_INIT_LIST_HEAD(&cli->cl_cache_waiters);
 278         CFS_INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 279         CFS_INIT_LIST_HEAD(&cli->cl_loi_write_list);
 280         CFS_INIT_LIST_HEAD(&cli->cl_loi_read_list);
 281         client_obd_list_lock_init(&cli->cl_loi_list_lock);
 282         cli->cl_r_in_flight = 0;
 283         cli->cl_w_in_flight = 0;
 284
 285         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 286         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 287         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 288         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 289         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 290         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 291         cfs_waitq_init(&cli->cl_destroy_waitq);
 292         atomic_set(&cli->cl_destroy_in_flight, 0);
 293 #ifdef ENABLE_CHECKSUM
 294         /* Turn on checksumming by default. */
 295         cli->cl_checksum = 1;
 296         /*
 297          * The supported checksum types will be worked out at connect time
 298          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 299          * through procfs.
 300          */
 301         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 302 #endif
 303         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 304
 305         /* This value may be changed at connect time in
 306            ptlrpc_connect_interpret. */
 307         cli->cl_max_pages_per_rpc = min((int)PTLRPC_MAX_BRW_PAGES,
 308                                         (int)(1024 * 1024 >> CFS_PAGE_SHIFT));
 309
 310         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 311                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
 312         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 128 /* MB */) {
 313                 cli->cl_max_rpcs_in_flight = 2;
 314         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 256 /* MB */) {
 315                 cli->cl_max_rpcs_in_flight = 3;
 316         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 512 /* MB */) {
 317                 cli->cl_max_rpcs_in_flight = 4;
 318         } else {
 319                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 320         }
 321
 322         rc = ldlm_get_ref();
 323         if (rc) {
 324                 CERROR("ldlm_get_ref failed: %d\n", rc);
 325                 GOTO(err, rc);
 326         }
 327
 328         ptlrpc_init_client(rq_portal, rp_portal, name,
 329                            &obddev->obd_ldlm_client);
 330
 331         imp = class_new_import(obddev);
 332         if (imp == NULL)
 333                 GOTO(err_ldlm, rc = -ENOENT);
 334         imp->imp_client = &obddev->obd_ldlm_client;
 335         imp->imp_connect_op = connect_op;
 336         imp->imp_initial_recov = 1;
 337         imp->imp_initial_recov_bk = 0;
 338         CFS_INIT_LIST_HEAD(&imp->imp_pinger_chain);
 339         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 340                LUSTRE_CFG_BUFLEN(lcfg, 1));
 341         class_import_put(imp);
 342
 343         rc = client_import_add_conn(imp, &server_uuid, 1);
 344         if (rc) {
 345                 CERROR("can't add initial connection\n");
 346                 GOTO(err_import, rc);
 347         }
 348
 349         cli->cl_import = imp;
 350         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 351         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 352         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 353
 354         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 355                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 356                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 357                                name, obddev->obd_name,
 358                                cli->cl_target_uuid.uuid);
 359                         spin_lock(&imp->imp_lock);
 360                         imp->imp_invalid = 1;
 361                         spin_unlock(&imp->imp_lock);
 362                 }
 363         }
 364
 365         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 366
 367         RETURN(rc);
 368
 369 err_import:
 370         class_destroy_import(imp);
 371 err_ldlm:
 372         ldlm_put_ref();
 373 err:
 374         RETURN(rc);
 375
 376 }
 377
 378 int client_obd_cleanup(struct obd_device *obddev)
 379 {
 380         ENTRY;
 381         ldlm_put_ref();
 382         RETURN(0);
 383 }
 384
 385 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 386 int client_connect_import(const struct lu_env *env,
 387                           struct lustre_handle *dlm_handle,
 388                           struct obd_device *obd, struct obd_uuid *cluuid,
 389                           struct obd_connect_data *data, void *localdata)
 390 {
 391         struct client_obd *cli = &obd->u.cli;
 392         struct obd_import *imp = cli->cl_import;
 393         struct obd_export *exp;
 394         struct obd_connect_data *ocd;
 395         struct ldlm_namespace *to_be_freed = NULL;
 396         int rc;
 397         ENTRY;
 398
 399         down_write(&cli->cl_sem);
 400         rc = class_connect(dlm_handle, obd, cluuid);
 401         if (rc)
 402                 GOTO(out_sem, rc);
 403
 404         cli->cl_conn_count++;
 405         if (cli->cl_conn_count > 1)
 406                 GOTO(out_sem, rc);
 407         exp = class_conn2export(dlm_handle);
 408
 409         if (obd->obd_namespace != NULL)
 410                 CERROR("already have namespace!\n");
 411         obd->obd_namespace = ldlm_namespace_new(obd, obd->obd_name,
 412                                                 LDLM_NAMESPACE_CLIENT,
 413                                                 LDLM_NAMESPACE_GREEDY);
 414         if (obd->obd_namespace == NULL)
 415                 GOTO(out_disco, rc = -ENOMEM);
 416
 417         imp->imp_dlm_handle = *dlm_handle;
 418         rc = ptlrpc_init_import(imp);
 419         if (rc != 0)
 420                 GOTO(out_ldlm, rc);
 421
 422         ocd = &imp->imp_connect_data;
 423         if (data) {
 424                 *ocd = *data;
 425                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 426         }
 427
 428         rc = ptlrpc_connect_import(imp, NULL);
 429         if (rc != 0) {
 430                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 431                 GOTO(out_ldlm, rc);
 432         }
 433         LASSERT(exp->exp_connection);
 434
 435         if (data) {
 436                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 437                          ocd->ocd_connect_flags, "old "LPX64", new "LPX64"\n",
 438                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 439                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 440         }
 441
 442         ptlrpc_pinger_add_import(imp);
 443
 444         EXIT;
 445
 446         if (rc) {
 447 out_ldlm:
 448                 ldlm_namespace_free_prior(obd->obd_namespace, imp, 0);
 449                 to_be_freed = obd->obd_namespace;
 450                 obd->obd_namespace = NULL;
 451 out_disco:
 452                 cli->cl_conn_count--;
 453                 class_disconnect(exp);
 454         } else {
 455                 class_export_put(exp);
 456         }
 457 out_sem:
 458         up_write(&cli->cl_sem);
 459         if (to_be_freed)
 460                 ldlm_namespace_free_post(to_be_freed);
 461
 462         return rc;
 463 }
 464
 465 int client_disconnect_export(struct obd_export *exp)
 466 {
 467         struct obd_device *obd = class_exp2obd(exp);
 468         struct client_obd *cli;
 469         struct obd_import *imp;
 470         int rc = 0, err;
 471         struct ldlm_namespace *to_be_freed = NULL;
 472         ENTRY;
 473
 474         if (!obd) {
 475                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 476                        exp, exp ? exp->exp_handle.h_cookie : -1);
 477                 RETURN(-EINVAL);
 478         }
 479
 480         cli = &obd->u.cli;
 481         imp = cli->cl_import;
 482
 483         down_write(&cli->cl_sem);
 484         if (!cli->cl_conn_count) {
 485                 CERROR("disconnecting disconnected device (%s)\n",
 486                        obd->obd_name);
 487                 GOTO(out_sem, rc = -EINVAL);
 488         }
 489
 490         cli->cl_conn_count--;
 491         if (cli->cl_conn_count)
 492                 GOTO(out_no_disconnect, rc = 0);
 493
 494         /* Mark import deactivated now, so we don't try to reconnect if any
 495          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
 496          * fully deactivate the import, or that would drop all requests. */
 497         spin_lock(&imp->imp_lock);
 498         imp->imp_deactive = 1;
 499         spin_unlock(&imp->imp_lock);
 500
 501         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 502          * delete it regardless.  (It's safe to delete an import that was
 503          * never added.) */
 504         (void)ptlrpc_pinger_del_import(imp);
 505
 506         if (obd->obd_namespace != NULL) {
 507                 /* obd_force == local only */
 508                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 509                                        obd->obd_force ? LDLM_FL_LOCAL_ONLY:0,
 510                                        NULL);
 511                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 512                 to_be_freed = obd->obd_namespace;
 513         }
 514
 515         rc = ptlrpc_disconnect_import(imp, 0);
 516
 517         ptlrpc_invalidate_import(imp);
 518         /* set obd_namespace to NULL only after invalidate, because we can have
 519          * some connect requests in flight, and his need store a connect flags
 520          * in obd_namespace. bug 14260 */
 521         obd->obd_namespace = NULL;
 522
 523         if (imp->imp_rq_pool) {
 524                 ptlrpc_free_rq_pool(imp->imp_rq_pool);
 525                 imp->imp_rq_pool = NULL;
 526         }
 527         destroy_import(imp);
 528         cli->cl_import = NULL;
 529
 530         EXIT;
 531  out_no_disconnect:
 532         err = class_disconnect(exp);
 533         if (!rc && err)
 534                 rc = err;
 535  out_sem:
 536         up_write(&cli->cl_sem);
 537         if (to_be_freed)
 538                 ldlm_namespace_free_post(to_be_freed);
 539
 540         RETURN(rc);
 541 }
 542
 543 /* --------------------------------------------------------------------------
 544  * from old lib/target.c
 545  * -------------------------------------------------------------------------- */
 546
 547 int target_handle_reconnect(struct lustre_handle *conn, struct obd_export *exp,
 548                             struct obd_uuid *cluuid, int initial_conn)
 549 {
 550         ENTRY;
 551         if (exp->exp_connection && exp->exp_imp_reverse && !initial_conn) {
 552                 struct lustre_handle *hdl;
 553                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 554                 /* Might be a re-connect after a partition. */
 555                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 556                         CWARN("%s: %s reconnecting\n", exp->exp_obd->obd_name,
 557                               cluuid->uuid);
 558                         conn->cookie = exp->exp_handle.h_cookie;
 559                         /* target_handle_connect() treats EALREADY and
 560                          * -EALREADY differently.  EALREADY means we are
 561                          * doing a valid reconnect from the same client. */
 562                         RETURN(EALREADY);
 563                 } else {
 564                         CERROR("%s reconnecting from %s, "
 565                                "handle mismatch (ours "LPX64", theirs "
 566                                LPX64")\n", cluuid->uuid,
 567                                exp->exp_connection->c_remote_uuid.uuid,
 568                                hdl->cookie, conn->cookie);
 569                         memset(conn, 0, sizeof *conn);
 570                         /* target_handle_connect() treats EALREADY and
 571                          * -EALREADY differently.  -EALREADY is an error
 572                          * (same UUID, different handle). */
 573                         RETURN(-EALREADY);
 574                 }
 575         }
 576
 577         conn->cookie = exp->exp_handle.h_cookie;
 578         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
 579                cluuid->uuid, exp, conn->cookie);
 580         RETURN(0);
 581 }
 582
 583 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
 584                           int error)
 585 {
 586         struct obd_export *exp = cb_data;
 587
 588         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 589                obd->obd_name, exp->exp_client_uuid.uuid);
 590
 591         spin_lock(&exp->exp_lock);
 592         exp->exp_need_sync = 0;
 593         spin_unlock(&exp->exp_lock);
 594 }
 595 EXPORT_SYMBOL(target_client_add_cb);
 596 static void
 597 target_start_and_reset_recovery_timer(struct obd_device *obd,
 598                                       struct ptlrpc_request *req,
 599                                       int new_client);
 600
 601 int target_handle_connect(struct ptlrpc_request *req)
 602 {
 603         struct obd_device *target, *targref = NULL;
 604         struct obd_export *export = NULL;
 605         struct obd_import *revimp;
 606         struct lustre_handle conn;
 607         struct lustre_handle *tmp;
 608         struct obd_uuid tgtuuid;
 609         struct obd_uuid cluuid;
 610         struct obd_uuid remote_uuid;
 611         char *str;
 612         int rc = 0;
 613         int initial_conn = 0;
 614         struct obd_connect_data *data, *tmpdata;
 615         lnet_nid_t *client_nid = NULL;
 616         ENTRY;
 617
 618         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 619
 620         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 621         if (str == NULL) {
 622                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 623                 GOTO(out, rc = -EINVAL);
 624         }
 625
 626         obd_str2uuid(&tgtuuid, str);
 627         target = class_uuid2obd(&tgtuuid);
 628         if (!target)
 629                 target = class_name2obd(str);
 630
 631         if (!target || target->obd_stopping || !target->obd_set_up) {
 632                 LCONSOLE_ERROR_MSG(0x137, "UUID '%s' is not available "
 633                                    " for connect (%s)\n", str,
 634                                    !target ? "no target" :
 635                                    (target->obd_stopping ? "stopping" :
 636                                    "not set up"));
 637                 GOTO(out, rc = -ENODEV);
 638         }
 639
 640         if (target->obd_no_conn) {
 641                 LCONSOLE_WARN("%s: temporarily refusing client connection "
 642                               "from %s\n", target->obd_name,
 643                               libcfs_nid2str(req->rq_peer.nid));
 644                 GOTO(out, rc = -EAGAIN);
 645         }
 646
 647         /* Make sure the target isn't cleaned up while we're here. Yes,
 648            there's still a race between the above check and our incref here.
 649            Really, class_uuid2obd should take the ref. */
 650         targref = class_incref(target, __FUNCTION__, cfs_current());
 651
 652
 653         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
 654         if (str == NULL) {
 655                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
 656                 GOTO(out, rc = -EINVAL);
 657         }
 658
 659         obd_str2uuid(&cluuid, str);
 660
 661         /* XXX extract a nettype and format accordingly */
 662         switch (sizeof(lnet_nid_t)) {
 663                 /* NB the casts only avoid compiler warnings */
 664         case 8:
 665                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 666                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
 667                 break;
 668         case 4:
 669                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 670                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
 671                 break;
 672         default:
 673                 LBUG();
 674         }
 675
 676         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 677         if (tmp == NULL)
 678                 GOTO(out, rc = -EPROTO);
 679
 680         conn = *tmp;
 681
 682         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 683         if (!data)
 684                 GOTO(out, rc = -EPROTO);
 685
 686         rc = req_capsule_server_pack(&req->rq_pill);
 687         if (rc)
 688                 GOTO(out, rc);
 689
 690         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 691                 if (!data) {
 692                         DEBUG_REQ(D_WARNING, req, "Refusing old (unversioned) "
 693                                   "libclient connection attempt");
 694                         GOTO(out, rc = -EPROTO);
 695                 } else if (data->ocd_version < LUSTRE_VERSION_CODE -
 696                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
 697                            data->ocd_version > LUSTRE_VERSION_CODE +
 698                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
 699                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
 700                                   "libclient connection attempt",
 701                                   data->ocd_version < LUSTRE_VERSION_CODE ?
 702                                   "old" : "new",
 703                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
 704                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
 705                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
 706                                   OBD_OCD_VERSION_FIX(data->ocd_version));
 707                         data = req_capsule_server_sized_get(&req->rq_pill,
 708                                                         &RMF_CONNECT_DATA,
 709                                     offsetof(typeof(*data), ocd_version) +
 710                                              sizeof(data->ocd_version));
 711                         if (data) {
 712                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
 713                                 data->ocd_version = LUSTRE_VERSION_CODE;
 714                         }
 715                         GOTO(out, rc = -EPROTO);
 716                 }
 717         }
 718
 719         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL)
 720                 initial_conn = 1;
 721
 722         /* lctl gets a backstage, all-access pass. */
 723         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 724                 goto dont_check_exports;
 725
 726         spin_lock(&target->obd_dev_lock);
 727         export = lustre_hash_lookup(target->obd_uuid_hash, &cluuid);
 728
 729         if (export != NULL && export->exp_connecting) { /* bug 9635, et. al. */
 730                 CWARN("%s: exp %p already connecting\n",
 731                       export->exp_obd->obd_name, export);
 732                 class_export_put(export);
 733                 export = NULL;
 734                 rc = -EALREADY;
 735         } else if (export != NULL && export->exp_connection != NULL &&
 736                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
 737                 /* make darn sure this is coming from the same peer
 738                  * if the UUIDs matched */
 739                   CWARN("%s: cookie %s seen on new NID %s when "
 740                           "existing NID %s is already connected\n",
 741                         target->obd_name, cluuid.uuid,
 742                   libcfs_nid2str(req->rq_peer.nid),
 743                   libcfs_nid2str(export->exp_connection->c_peer.nid));
 744                   class_export_put(export);
 745                   export = NULL;
 746                   rc = -EALREADY;
 747         } else if (export != NULL) {
 748                 spin_lock(&export->exp_lock);
 749                 export->exp_connecting = 1;
 750                 spin_unlock(&export->exp_lock);
 751                 class_export_put(export);
 752                 spin_unlock(&target->obd_dev_lock);
 753                 LASSERT(export->exp_obd == target);
 754
 755                 rc = target_handle_reconnect(&conn, export, &cluuid, initial_conn);
 756         }
 757
 758         /* If we found an export, we already unlocked. */
 759         if (!export) {
 760                 spin_unlock(&target->obd_dev_lock);
 761                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
 762         } else if (req->rq_export == NULL &&
 763                    atomic_read(&export->exp_rpc_count) > 0) {
 764                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
 765                       target->obd_name, cluuid.uuid,
 766                       libcfs_nid2str(req->rq_peer.nid),
 767                       export, atomic_read(&export->exp_refcount));
 768                 GOTO(out, rc = -EBUSY);
 769         } else if (req->rq_export != NULL &&
 770                    (atomic_read(&export->exp_rpc_count) > 1)) {
 771                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
 772                       target->obd_name, cluuid.uuid,
 773                       libcfs_nid2str(req->rq_peer.nid),
 774                       export, atomic_read(&export->exp_rpc_count));
 775                 GOTO(out, rc = -EBUSY);
 776         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
 777                    !initial_conn) {
 778                 CERROR("%s: NID %s (%s) reconnected with 1 conn_cnt; "
 779                        "cookies not random?\n", target->obd_name,
 780                        libcfs_nid2str(req->rq_peer.nid), cluuid.uuid);
 781                 GOTO(out, rc = -EALREADY);
 782         } else {
 783                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
 784                 if (req->rq_export == NULL && initial_conn)
 785                        export->exp_last_request_time =
 786                                max(export->exp_last_request_time,
 787                                    (time_t)cfs_time_current_sec());
 788         }
 789
 790         if (rc < 0) {
 791                 GOTO(out, rc);
 792         }
 793
 794         CWARN("%s: connection from %s@%s %st"LPU64" exp %p cur %ld last %ld\n",
 795                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 796               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
 797               export, (long)cfs_time_current_sec(),
 798               export ? (long)export->exp_last_request_time : 0);
 799
 800         /* Tell the client if we're in recovery. */
 801         if (target->obd_recovering) {
 802                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 803                 /* If this is the first time a client connects,
 804                    reset the recovery timer */
 805                 if (rc == 0)
 806                         target_start_and_reset_recovery_timer(target, req,
 807                                                               !export);
 808         }
 809
 810         /* We want to handle EALREADY but *not* -EALREADY from
 811          * target_handle_reconnect(), return reconnection state in a flag */
 812         if (rc == EALREADY) {
 813                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 814                 rc = 0;
 815         } else {
 816                 LASSERT(rc == 0);
 817         }
 818
 819         /* Tell the client if we support replayable requests */
 820         if (target->obd_replayable)
 821                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 822         client_nid = &req->rq_peer.nid;
 823
 824         if (export == NULL) {
 825                 if (target->obd_recovering) {
 826                         cfs_time_t t;
 827
 828                         t = cfs_timer_deadline(&target->obd_recovery_timer);
 829                         t = cfs_time_sub(t, cfs_time_current());
 830                         CERROR("%s: denying connection for new client %s (%s): "
 831                                "%d clients in recovery for "CFS_TIME_T"s\n",
 832                                target->obd_name,
 833                                libcfs_nid2str(req->rq_peer.nid), cluuid.uuid,
 834                                target->obd_recoverable_clients,
 835                                cfs_duration_sec(t));
 836                         rc = -EBUSY;
 837                 } else {
 838 dont_check_exports:
 839                         rc = obd_connect(req->rq_svc_thread->t_env,
 840                                          &conn, target, &cluuid, data,
 841                                          client_nid);
 842                 }
 843         } else {
 844                 rc = obd_reconnect(req->rq_svc_thread->t_env,
 845                                    export, target, &cluuid, data, client_nid);
 846         }
 847         if (rc)
 848                 GOTO(out, rc);
 849         /* Return only the parts of obd_connect_data that we understand, so the
 850          * client knows that we don't understand the rest. */
 851         if (data) {
 852                  tmpdata = req_capsule_server_get(&req->rq_pill,
 853                                                   &RMF_CONNECT_DATA);
 854                   //data->ocd_connect_flags &= OBD_CONNECT_SUPPORTED;
 855                  *tmpdata = *data;
 856         }
 857
 858         /* If all else goes well, this is our RPC return code. */
 859         req->rq_status = 0;
 860
 861         lustre_msg_set_handle(req->rq_repmsg, &conn);
 862
 863         /* ownership of this export ref transfers to the request AFTER we
 864          * drop any previous reference the request had, but we don't want
 865          * that to go to zero before we get our new export reference. */
 866         export = class_conn2export(&conn);
 867         if (!export) {
 868                 DEBUG_REQ(D_ERROR, req, "Missing export!");
 869                 GOTO(out, rc = -ENODEV);
 870         }
 871
 872         /* If the client and the server are the same node, we will already
 873          * have an export that really points to the client's DLM export,
 874          * because we have a shared handles table.
 875          *
 876          * XXX this will go away when shaver stops sending the "connect" handle
 877          * in the real "remote handle" field of the request --phik 24 Apr 2003
 878          */
 879         if (req->rq_export != NULL)
 880                 class_export_put(req->rq_export);
 881
 882         req->rq_export = export;
 883
 884         spin_lock(&export->exp_lock);
 885         if (initial_conn) {
 886                 lustre_msg_set_conn_cnt(req->rq_repmsg, export->exp_conn_cnt + 1);
 887         } else if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
 888                 spin_unlock(&export->exp_lock);
 889                 CERROR("%s: %s already connected at higher conn_cnt: %d > %d\n",
 890                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 891                        export->exp_conn_cnt,
 892                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
 893
 894                 GOTO(out, rc = -EALREADY);
 895         }
 896         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
 897
 898         /* request from liblustre?  Don't evict it for not pinging. */
 899         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 900                 export->exp_libclient = 1;
 901                 spin_unlock(&export->exp_lock);
 902
 903                 spin_lock(&target->obd_dev_lock);
 904                 list_del_init(&export->exp_obd_chain_timed);
 905                 spin_unlock(&target->obd_dev_lock);
 906         } else {
 907                 spin_unlock(&export->exp_lock);
 908         }
 909
 910         if (export->exp_connection != NULL)
 911                 ptlrpc_connection_put(export->exp_connection);
 912         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
 913                                                        req->rq_self,
 914                                                        &remote_uuid);
 915         if (hlist_unhashed(&export->exp_nid_hash)) {
 916                 lustre_hash_add_unique(export->exp_obd->obd_nid_hash,
 917                                        &export->exp_connection->c_peer.nid,
 918                                        &export->exp_nid_hash);
 919         }
 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_init(&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         spin_lock_bh(&obd->obd_processing_task_lock);
1165         if (list_empty(&obd->obd_req_replay_queue) &&
1166             list_empty(&obd->obd_lock_replay_queue) &&
1167             list_empty(&obd->obd_final_req_queue)) {
1168                 obd->obd_processing_task = 0;
1169         } else {
1170                 CERROR("%s: Recovery queues ( %s%s%s) are empty\n",
1171                        obd->obd_name,
1172                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1173                        list_empty(&obd->obd_lock_replay_queue) ? "" : "lock ",
1174                        list_empty(&obd->obd_final_req_queue) ? "" : "final ");
1175                 spin_unlock_bh(&obd->obd_processing_task_lock);
1176                 LBUG();
1177         }
1178         spin_unlock_bh(&obd->obd_processing_task_lock);
1179
1180         /* when recovery finished, cleanup orphans on mds and ost */
1181         if (OBT(obd) && OBP(obd, postrecov)) {
1182                 int rc = OBP(obd, postrecov)(obd);
1183                 LCONSOLE_WARN("%s: recovery %s: rc %d\n", obd->obd_name,
1184                               rc < 0 ? "failed" : "complete", rc);
1185         }
1186
1187         obd->obd_recovery_end = cfs_time_current_sec();
1188         EXIT;
1189 }
1190
1191 static void abort_req_replay_queue(struct obd_device *obd)
1192 {
1193         struct ptlrpc_request *req, *n;
1194         struct list_head abort_list;
1195
1196         CFS_INIT_LIST_HEAD(&abort_list);
1197         spin_lock_bh(&obd->obd_processing_task_lock);
1198         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1199         spin_unlock_bh(&obd->obd_processing_task_lock);
1200         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1201                 DEBUG_REQ(D_WARNING, req, "aborted:");
1202                 req->rq_status = -ENOTCONN;
1203                 if (ptlrpc_error(req)) {
1204                         DEBUG_REQ(D_ERROR, req,
1205                                   "failed abort_req_reply; skipping");
1206                 }
1207                 target_exp_dequeue_req_replay(req);
1208                 ptlrpc_free_clone(req);
1209         }
1210 }
1211
1212 static void abort_lock_replay_queue(struct obd_device *obd)
1213 {
1214         struct ptlrpc_request *req, *n;
1215         struct list_head abort_list;
1216
1217         CFS_INIT_LIST_HEAD(&abort_list);
1218         spin_lock_bh(&obd->obd_processing_task_lock);
1219         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1220         spin_unlock_bh(&obd->obd_processing_task_lock);
1221         list_for_each_entry_safe(req, n, &obd->obd_lock_replay_queue, rq_list){
1222                 DEBUG_REQ(D_ERROR, req, "aborted:");
1223                 req->rq_status = -ENOTCONN;
1224                 if (ptlrpc_error(req)) {
1225                         DEBUG_REQ(D_ERROR, req,
1226                                   "failed abort_lock_reply; skipping");
1227                 }
1228                 ptlrpc_free_clone(req);
1229         }
1230 }
1231 #endif
1232
1233 /* Called from a cleanup function if the device is being cleaned up
1234    forcefully.  The exports should all have been disconnected already,
1235    the only thing left to do is
1236      - clear the recovery flags
1237      - cancel the timer
1238      - free queued requests and replies, but don't send replies
1239    Because the obd_stopping flag is set, no new requests should be received.
1240
1241 */
1242 void target_cleanup_recovery(struct obd_device *obd)
1243 {
1244         struct ptlrpc_request *req, *n;
1245         struct list_head clean_list;
1246         ENTRY;
1247
1248         LASSERT(obd->obd_stopping);
1249
1250         CFS_INIT_LIST_HEAD(&clean_list);
1251         spin_lock_bh(&obd->obd_processing_task_lock);
1252         if (!obd->obd_recovering) {
1253                 spin_unlock_bh(&obd->obd_processing_task_lock);
1254                 EXIT;
1255                 return;
1256         }
1257         obd->obd_recovering = obd->obd_abort_recovery = 0;
1258         target_cancel_recovery_timer(obd);
1259
1260         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1261         spin_unlock_bh(&obd->obd_processing_task_lock);
1262
1263         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1264                 LASSERT(req->rq_reply_state == 0);
1265                 target_exp_dequeue_req_replay(req);
1266                 ptlrpc_free_clone(req);
1267         }
1268
1269         spin_lock_bh(&obd->obd_processing_task_lock);
1270         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1271         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1272         spin_unlock_bh(&obd->obd_processing_task_lock);
1273
1274         list_for_each_entry_safe(req, n, &clean_list, rq_list){
1275                 LASSERT(req->rq_reply_state == 0);
1276                 ptlrpc_free_clone(req);
1277         }
1278
1279         EXIT;
1280 }
1281
1282 /* obd_processing_task_lock should be held */
1283 void target_cancel_recovery_timer(struct obd_device *obd)
1284 {
1285         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1286         cfs_timer_disarm(&obd->obd_recovery_timer);
1287 }
1288
1289 /* extend = 1 means require at least "duration" seconds left in the timer,
1290    extend = 0 means set the total duration (start_recovery_timer) */
1291 static void reset_recovery_timer(struct obd_device *obd, int duration,
1292                                  int extend)
1293 {
1294         cfs_time_t now = cfs_time_current_sec();
1295         cfs_duration_t left;
1296
1297         spin_lock_bh(&obd->obd_processing_task_lock);
1298         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1299                 spin_unlock_bh(&obd->obd_processing_task_lock);
1300                 return;
1301         }
1302
1303         left = cfs_time_sub(obd->obd_recovery_end, now);
1304
1305         if (extend && (duration > left))
1306                 obd->obd_recovery_timeout += duration - left;
1307         else if (!extend && (duration > obd->obd_recovery_timeout))
1308                 /* Track the client's largest expected replay time */
1309                 obd->obd_recovery_timeout = duration;
1310 #ifdef CRAY_XT3
1311         /*
1312          * If total recovery time already exceed the
1313          * obd_recovery_max_time, then CRAY XT3 will
1314          * abort the recovery
1315          */
1316         if(obd->obd_recovery_timeout > obd->obd_recovery_max_time)
1317                 obd->obd_recovery_timeout = obd->obd_recovery_max_time;
1318 #endif
1319         obd->obd_recovery_end = obd->obd_recovery_start +
1320                                 obd->obd_recovery_timeout;
1321         if (!cfs_timer_is_armed(&obd->obd_recovery_timer) ||
1322             cfs_time_before(now, obd->obd_recovery_end)) {
1323                 left = cfs_time_sub(obd->obd_recovery_end, now);
1324                 cfs_timer_arm(&obd->obd_recovery_timer, cfs_time_shift(left));
1325         }
1326         spin_unlock_bh(&obd->obd_processing_task_lock);
1327         CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
1328                obd->obd_name, (unsigned)left);
1329 }
1330
1331 static void check_and_start_recovery_timer(struct obd_device *obd)
1332 {
1333         spin_lock_bh(&obd->obd_processing_task_lock);
1334         if (cfs_timer_is_armed(&obd->obd_recovery_timer)) {
1335                 spin_unlock_bh(&obd->obd_processing_task_lock);
1336                 return;
1337         }
1338         CWARN("%s: starting recovery timer\n", obd->obd_name);
1339         obd->obd_recovery_start = cfs_time_current_sec();
1340         /* minimum */
1341         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1342         spin_unlock_bh(&obd->obd_processing_task_lock);
1343
1344         reset_recovery_timer(obd, obd->obd_recovery_timeout, 0);
1345 }
1346
1347 /* Reset the timer with each new client connection */
1348 /*
1349  * This timer is actually reconnect_timer, which is for making sure
1350  * the total recovery window is at least as big as my reconnect
1351  * attempt timing. So the initial recovery time_out will be set to
1352  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1353  * from client is bigger than this, then the recovery time_out will
1354  * be extend to make sure the client could be reconnected, in the
1355  * process, the timeout from the new client should be ignored.
1356  */
1357
1358 static void
1359 target_start_and_reset_recovery_timer(struct obd_device *obd,
1360                                       struct ptlrpc_request *req,
1361                                       int new_client)
1362 {
1363         int req_timeout = lustre_msg_get_timeout(req->rq_reqmsg);
1364
1365         /* teach server about old server's estimates */
1366         if (!new_client)
1367                 at_add(&req->rq_rqbd->rqbd_service->srv_at_estimate,
1368                        at_timeout2est(req_timeout));
1369
1370         check_and_start_recovery_timer(obd);
1371
1372         req_timeout *= OBD_RECOVERY_FACTOR;
1373         if (req_timeout > obd->obd_recovery_timeout && !new_client)
1374                 reset_recovery_timer(obd, req_timeout, 0);
1375 }
1376
1377 #ifdef __KERNEL__
1378 static int check_for_next_transno(struct obd_device *obd)
1379 {
1380         struct ptlrpc_request *req = NULL;
1381         int wake_up = 0, connected, completed, queue_len, max;
1382         __u64 next_transno, req_transno;
1383         ENTRY;
1384         spin_lock_bh(&obd->obd_processing_task_lock);
1385
1386         if (!list_empty(&obd->obd_req_replay_queue)) {
1387                 req = list_entry(obd->obd_req_replay_queue.next,
1388                                  struct ptlrpc_request, rq_list);
1389                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1390         } else {
1391                 req_transno = 0;
1392         }
1393
1394         max = obd->obd_max_recoverable_clients;
1395         connected = obd->obd_connected_clients;
1396         completed = connected - obd->obd_recoverable_clients;
1397         queue_len = obd->obd_requests_queued_for_recovery;
1398         next_transno = obd->obd_next_recovery_transno;
1399
1400         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1401                "req_transno: "LPU64", next_transno: "LPU64"\n",
1402                max, connected, completed, queue_len, req_transno, next_transno);
1403
1404         if (obd->obd_abort_recovery) {
1405                 CDEBUG(D_HA, "waking for aborted recovery\n");
1406                 wake_up = 1;
1407         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1408                 CDEBUG(D_HA, "waking for completed recovery\n");
1409                 wake_up = 1;
1410         } else if (req_transno == next_transno) {
1411                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1412                 wake_up = 1;
1413         } else if (queue_len + completed == max) {
1414                 /* handle gaps occured due to lost reply. It is allowed gaps
1415                  * because all clients are connected and there will be resend
1416                  * for missed transaction */
1417                 LASSERTF(req_transno >= next_transno,
1418                          "req_transno: "LPU64", next_transno: "LPU64"\n",
1419                          req_transno, next_transno);
1420
1421                 CDEBUG(req_transno > obd->obd_last_committed ? D_ERROR : D_HA,
1422                        "waking for skipped transno (skip: "LPD64
1423                        ", ql: %d, comp: %d, conn: %d, next: "LPD64")\n",
1424                        next_transno, queue_len, completed, connected, req_transno);
1425                 obd->obd_next_recovery_transno = req_transno;
1426                 wake_up = 1;
1427         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1428                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1429                        " by fail_lock, waking up ("LPD64")\n", next_transno);
1430                 obd->obd_next_recovery_transno = req_transno;
1431                 wake_up = 1;
1432         } else if (queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1433                 /* some clients haven't connected in time, but we can try
1434                  * to replay requests that demand on already committed ones
1435                  * also, we can replay first non-committed transation */
1436                 LASSERT(req_transno != 0);
1437                 if (req_transno == obd->obd_last_committed + 1) {
1438                         obd->obd_next_recovery_transno = req_transno;
1439                 } else if (req_transno > obd->obd_last_committed) {
1440                         /* can't continue recovery: have no needed transno */
1441                         obd->obd_abort_recovery = 1;
1442                         CDEBUG(D_ERROR, "abort due to missed clients. max: %d, "
1443                                "connected: %d, completed: %d, queue_len: %d, "
1444                                "req_transno: "LPU64", next_transno: "LPU64"\n",
1445                                max, connected, completed, queue_len,
1446                                req_transno, next_transno);
1447                 }
1448                 wake_up = 1;
1449         }
1450
1451         spin_unlock_bh(&obd->obd_processing_task_lock);
1452         return wake_up;
1453 }
1454
1455 static struct ptlrpc_request *target_next_replay_req(struct obd_device *obd)
1456 {
1457         struct l_wait_info lwi = { 0 };
1458         struct ptlrpc_request *req;
1459
1460         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1461                obd->obd_next_recovery_transno);
1462         l_wait_event(obd->obd_next_transno_waitq,
1463                      check_for_next_transno(obd), &lwi);
1464
1465         spin_lock_bh(&obd->obd_processing_task_lock);
1466         if (obd->obd_abort_recovery) {
1467                 req = NULL;
1468         } else if (!list_empty(&obd->obd_req_replay_queue)) {
1469                 req = list_entry(obd->obd_req_replay_queue.next,
1470                                  struct ptlrpc_request, rq_list);
1471                 target_exp_dequeue_req_replay(req);
1472                 list_del_init(&req->rq_list);
1473                 obd->obd_requests_queued_for_recovery--;
1474         } else {
1475                 req = NULL;
1476         }
1477         spin_unlock_bh(&obd->obd_processing_task_lock);
1478         RETURN(req);
1479 }
1480
1481 static int check_for_next_lock(struct obd_device *obd)
1482 {
1483         struct ptlrpc_request *req = NULL;
1484         int wake_up = 0;
1485
1486         spin_lock_bh(&obd->obd_processing_task_lock);
1487         if (!list_empty(&obd->obd_lock_replay_queue)) {
1488                 req = list_entry(obd->obd_lock_replay_queue.next,
1489                                  struct ptlrpc_request, rq_list);
1490                 CDEBUG(D_HA, "waking for next lock\n");
1491                 wake_up = 1;
1492         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1493                 CDEBUG(D_HA, "waking for completed lock replay\n");
1494                 wake_up = 1;
1495         } else if (obd->obd_abort_recovery) {
1496                 CDEBUG(D_HA, "waking for aborted recovery\n");
1497                 wake_up = 1;
1498         }
1499         spin_unlock_bh(&obd->obd_processing_task_lock);
1500
1501         return wake_up;
1502 }
1503
1504 static struct ptlrpc_request *target_next_replay_lock(struct obd_device *obd)
1505 {
1506         struct l_wait_info lwi = { 0 };
1507         struct ptlrpc_request *req;
1508
1509         CDEBUG(D_HA, "Waiting for lock\n");
1510         l_wait_event(obd->obd_next_transno_waitq,
1511                      check_for_next_lock(obd), &lwi);
1512
1513         spin_lock_bh(&obd->obd_processing_task_lock);
1514         if (obd->obd_abort_recovery) {
1515                 req = NULL;
1516         } else if (!list_empty(&obd->obd_lock_replay_queue)) {
1517                 req = list_entry(obd->obd_lock_replay_queue.next,
1518                                  struct ptlrpc_request, rq_list);
1519                 list_del_init(&req->rq_list);
1520         } else {
1521                 req = NULL;
1522         }
1523         spin_unlock_bh(&obd->obd_processing_task_lock);
1524         return req;
1525 }
1526
1527 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
1528 {
1529         struct ptlrpc_request *req;
1530
1531         spin_lock_bh(&obd->obd_processing_task_lock);
1532         if (!list_empty(&obd->obd_final_req_queue)) {
1533                 req = list_entry(obd->obd_final_req_queue.next,
1534                                  struct ptlrpc_request, rq_list);
1535                 list_del_init(&req->rq_list);
1536         } else {
1537                 req = NULL;
1538         }
1539         spin_unlock_bh(&obd->obd_processing_task_lock);
1540         return req;
1541 }
1542
1543 static inline int req_replay_done(struct obd_export *exp)
1544 {
1545         return (exp->exp_req_replay_needed == 0);
1546 }
1547
1548 static inline int lock_replay_done(struct obd_export *exp)
1549 {
1550         return (exp->exp_lock_replay_needed == 0);
1551 }
1552
1553 static inline int connect_done(struct obd_export *exp)
1554 {
1555         return (exp->exp_in_recovery != 0);
1556 }
1557
1558 static int check_for_clients(struct obd_device *obd)
1559 {
1560         if (obd->obd_abort_recovery)
1561                 return 1;
1562         LASSERT(obd->obd_connected_clients <= obd->obd_max_recoverable_clients);
1563         if (obd->obd_no_conn == 0 &&
1564             obd->obd_connected_clients == obd->obd_max_recoverable_clients)
1565                 return 1;
1566         return 0;
1567 }
1568
1569 static int handle_recovery_req(struct ptlrpc_thread *thread,
1570                                struct ptlrpc_request *req,
1571                                svc_handler_t handler)
1572 {
1573         int rc;
1574         ENTRY;
1575
1576         rc = lu_context_init(&req->rq_session, LCT_SESSION);
1577         if (rc) {
1578                 CERROR("Failure to initialize session: %d\n", rc);
1579                 return rc;
1580         }
1581         req->rq_session.lc_thread = thread;
1582         lu_context_enter(&req->rq_session);
1583         req->rq_svc_thread = thread;
1584         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
1585
1586         /* thread context */
1587         lu_context_enter(&thread->t_env->le_ctx);
1588         (void)handler(req);
1589         lu_context_exit(&thread->t_env->le_ctx);
1590
1591         lu_context_exit(&req->rq_session);
1592         lu_context_fini(&req->rq_session);
1593         /* don't reset timer for final stage */
1594         if (!req_replay_done(req->rq_export) ||
1595             !lock_replay_done(req->rq_export))
1596                 reset_recovery_timer(class_exp2obd(req->rq_export),
1597                        OBD_RECOVERY_FACTOR * AT_OFF ? obd_timeout :
1598                        at_get(&req->rq_rqbd->rqbd_service->srv_at_estimate), 1);
1599         ptlrpc_free_clone(req);
1600         RETURN(0);
1601 }
1602
1603 static void resume_recovery_timer(struct obd_device *obd)
1604 {
1605         /* to be safe, make it at least OBD_RECOVERY_FACTOR * obd_timeout */
1606         reset_recovery_timer(obd, OBD_RECOVERY_FACTOR * obd_timeout, 1);
1607 }
1608
1609 static int target_recovery_thread(void *arg)
1610 {
1611         struct obd_device *obd = arg;
1612         struct ptlrpc_request *req;
1613         struct target_recovery_data *trd = &obd->obd_recovery_data;
1614         struct l_wait_info lwi = { 0 };
1615         unsigned long delta;
1616         unsigned long flags;
1617         struct lu_env env;
1618         struct ptlrpc_thread fake_svc_thread, *thread = &fake_svc_thread;
1619         int rc = 0;
1620         ENTRY;
1621
1622         cfs_daemonize("tgt_recov");
1623
1624         SIGNAL_MASK_LOCK(current, flags);
1625         sigfillset(&current->blocked);
1626         RECALC_SIGPENDING;
1627         SIGNAL_MASK_UNLOCK(current, flags);
1628
1629         rc = lu_context_init(&env.le_ctx, LCT_MD_THREAD);
1630         if (rc)
1631                 RETURN(rc);
1632
1633         thread->t_env = &env;
1634         env.le_ctx.lc_thread = thread;
1635
1636         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
1637                current->pid);
1638         trd->trd_processing_task = current->pid;
1639
1640         obd->obd_recovering = 1;
1641         complete(&trd->trd_starting);
1642
1643         /* first of all, we have to know the first transno to replay */
1644         obd->obd_abort_recovery = 0;
1645         l_wait_event(obd->obd_next_transno_waitq,
1646                      check_for_clients(obd), &lwi);
1647
1648         spin_lock_bh(&obd->obd_processing_task_lock);
1649         target_cancel_recovery_timer(obd);
1650         spin_unlock_bh(&obd->obd_processing_task_lock);
1651
1652         /* If some clients haven't connected in time, evict them */
1653         if (obd->obd_abort_recovery) {
1654                 CWARN("Some clients haven't connect in time (%d/%d),"
1655                        "evict them\n", obd->obd_connected_clients,
1656                        obd->obd_max_recoverable_clients);
1657                 obd->obd_abort_recovery = obd->obd_stopping;
1658                 class_disconnect_stale_exports(obd, connect_done);
1659         }
1660         /* next stage: replay requests */
1661         delta = jiffies;
1662         obd->obd_req_replaying = 1;
1663         CDEBUG(D_INFO, "1: request replay stage - %d clients from t"LPU64"\n",
1664               atomic_read(&obd->obd_req_replay_clients),
1665               obd->obd_next_recovery_transno);
1666         resume_recovery_timer(obd);
1667         while ((req = target_next_replay_req(obd))) {
1668                 LASSERT(trd->trd_processing_task == current->pid);
1669                 DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s",
1670                           lustre_msg_get_transno(req->rq_reqmsg),
1671                           libcfs_nid2str(req->rq_peer.nid));
1672                 handle_recovery_req(thread, req,
1673                                     trd->trd_recovery_handler);
1674                 obd->obd_replayed_requests++;
1675                 spin_lock_bh(&obd->obd_processing_task_lock);
1676                 obd->obd_next_recovery_transno++;
1677                 spin_unlock_bh(&obd->obd_processing_task_lock);
1678         }
1679
1680         spin_lock_bh(&obd->obd_processing_task_lock);
1681         target_cancel_recovery_timer(obd);
1682         spin_unlock_bh(&obd->obd_processing_task_lock);
1683
1684         /* If some clients haven't replayed requests in time, evict them */
1685         if (obd->obd_abort_recovery) {
1686                 CDEBUG(D_ERROR, "req replay timed out, aborting ...\n");
1687                 obd->obd_abort_recovery = obd->obd_stopping;
1688                 class_disconnect_stale_exports(obd, req_replay_done);
1689                 abort_req_replay_queue(obd);
1690         }
1691
1692         /* The second stage: replay locks */
1693         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
1694                atomic_read(&obd->obd_lock_replay_clients));
1695         resume_recovery_timer(obd);
1696         while ((req = target_next_replay_lock(obd))) {
1697                 LASSERT(trd->trd_processing_task == current->pid);
1698                 DEBUG_REQ(D_HA|D_WARNING, req, "processing lock from %s: ",
1699                           libcfs_nid2str(req->rq_peer.nid));
1700                 handle_recovery_req(thread, req,
1701                                     trd->trd_recovery_handler);
1702                 obd->obd_replayed_locks++;
1703         }
1704
1705         spin_lock_bh(&obd->obd_processing_task_lock);
1706         target_cancel_recovery_timer(obd);
1707         spin_unlock_bh(&obd->obd_processing_task_lock);
1708         /* If some clients haven't replayed requests in time, evict them */
1709         if (obd->obd_abort_recovery) {
1710                 int stale;
1711                 CERROR("lock replay timed out, aborting ...\n");
1712                 obd->obd_abort_recovery = obd->obd_stopping;
1713                 stale = class_disconnect_stale_exports(obd, lock_replay_done);
1714                 abort_lock_replay_queue(obd);
1715         }
1716
1717         /* We drop recoverying flag to forward all new requests
1718          * to regular mds_handle() since now */
1719         spin_lock_bh(&obd->obd_processing_task_lock);
1720         obd->obd_recovering = obd->obd_abort_recovery = 0;
1721         spin_unlock_bh(&obd->obd_processing_task_lock);
1722         /* The third stage: reply on final pings */
1723         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
1724         while ((req = target_next_final_ping(obd))) {
1725                 LASSERT(trd->trd_processing_task == current->pid);
1726                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
1727                           libcfs_nid2str(req->rq_peer.nid));
1728                 handle_recovery_req(thread, req,
1729                                     trd->trd_recovery_handler);
1730         }
1731
1732         delta = (jiffies - delta) / HZ;
1733         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
1734               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
1735         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
1736         LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
1737         if (delta > obd_timeout * 2) {
1738                 CWARN("too long recovery - read logs\n");
1739                 libcfs_debug_dumplog();
1740         }
1741
1742         target_finish_recovery(obd);
1743
1744         lu_context_fini(&env.le_ctx);
1745         trd->trd_processing_task = 0;
1746         complete(&trd->trd_finishing);
1747         RETURN(rc);
1748 }
1749
1750 int target_start_recovery_thread(struct obd_device *obd, svc_handler_t handler)
1751 {
1752         int rc = 0;
1753         struct target_recovery_data *trd = &obd->obd_recovery_data;
1754
1755         memset(trd, 0, sizeof(*trd));
1756         init_completion(&trd->trd_starting);
1757         init_completion(&trd->trd_finishing);
1758         trd->trd_recovery_handler = handler;
1759
1760         if (kernel_thread(target_recovery_thread, obd, 0) > 0) {
1761                 wait_for_completion(&trd->trd_starting);
1762                 LASSERT(obd->obd_recovering != 0);
1763         } else
1764                 rc = -ECHILD;
1765
1766         return rc;
1767 }
1768
1769 void target_stop_recovery_thread(struct obd_device *obd)
1770 {
1771         spin_lock_bh(&obd->obd_processing_task_lock);
1772         if (obd->obd_recovery_data.trd_processing_task > 0) {
1773                 struct target_recovery_data *trd = &obd->obd_recovery_data;
1774                 CERROR("%s: Aborting recovery\n", obd->obd_name);
1775                 obd->obd_abort_recovery = 1;
1776                 wake_up(&obd->obd_next_transno_waitq);
1777                 spin_unlock_bh(&obd->obd_processing_task_lock);
1778                 wait_for_completion(&trd->trd_finishing);
1779         } else {
1780                 spin_unlock_bh(&obd->obd_processing_task_lock);
1781         }
1782 }
1783
1784 void target_recovery_fini(struct obd_device *obd)
1785 {
1786         class_disconnect_exports(obd);
1787         target_stop_recovery_thread(obd);
1788         target_cleanup_recovery(obd);
1789 }
1790 EXPORT_SYMBOL(target_recovery_fini);
1791
1792 static void target_recovery_expired(unsigned long castmeharder)
1793 {
1794         struct obd_device *obd = (struct obd_device *)castmeharder;
1795         LCONSOLE_WARN("%s: recovery timed out; %d clients never reconnected "
1796                       "after %lds (%d clients did)\n",
1797                       obd->obd_name, obd->obd_recoverable_clients,
1798                       cfs_time_current_sec()- obd->obd_recovery_start,
1799                       obd->obd_connected_clients);
1800         spin_lock_bh(&obd->obd_processing_task_lock);
1801         if (obd->obd_recovering)
1802                 obd->obd_abort_recovery = 1;
1803         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1804         spin_unlock_bh(&obd->obd_processing_task_lock);
1805 }
1806
1807 void target_recovery_init(struct obd_device *obd, svc_handler_t handler)
1808 {
1809         if (obd->obd_max_recoverable_clients == 0)
1810                 return;
1811
1812         CWARN("RECOVERY: service %s, %d recoverable clients, "
1813               "last_transno "LPU64"\n", obd->obd_name,
1814               obd->obd_max_recoverable_clients, obd->obd_last_committed);
1815         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
1816         obd->obd_recovery_start = 0;
1817         obd->obd_recovery_end = 0;
1818         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1819         /* bz13079: this should be set to desired value for ost but not for mds */
1820         obd->obd_recovery_max_time = OBD_RECOVERY_MAX_TIME;
1821         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
1822         target_start_recovery_thread(obd, handler);
1823 }
1824 EXPORT_SYMBOL(target_recovery_init);
1825
1826 #endif
1827
1828 int target_process_req_flags(struct obd_device *obd, struct ptlrpc_request *req)
1829 {
1830         struct obd_export *exp = req->rq_export;
1831         LASSERT(exp != NULL);
1832         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1833                 /* client declares he's ready to replay locks */
1834                 spin_lock_bh(&obd->obd_processing_task_lock);
1835                 if (exp->exp_req_replay_needed) {
1836                         LASSERT(atomic_read(&obd->obd_req_replay_clients) > 0);
1837                         spin_lock(&exp->exp_lock);
1838                         exp->exp_req_replay_needed = 0;
1839                         spin_unlock(&exp->exp_lock);
1840                         atomic_dec(&obd->obd_req_replay_clients);
1841                         LASSERT(obd->obd_recoverable_clients > 0);
1842                         obd->obd_recoverable_clients--;
1843                         if (atomic_read(&obd->obd_req_replay_clients) == 0)
1844                                 CDEBUG(D_HA, "all clients have replayed reqs\n");
1845                         wake_up(&obd->obd_next_transno_waitq);
1846                 }
1847                 spin_unlock_bh(&obd->obd_processing_task_lock);
1848         }
1849         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1850                 /* client declares he's ready to complete recovery
1851                  * so, we put the request on th final queue */
1852                 spin_lock_bh(&obd->obd_processing_task_lock);
1853                 if (exp->exp_lock_replay_needed) {
1854                         LASSERT(atomic_read(&obd->obd_lock_replay_clients) > 0);
1855                         spin_lock(&exp->exp_lock);
1856                         exp->exp_lock_replay_needed = 0;
1857                         spin_unlock(&exp->exp_lock);
1858                         atomic_dec(&obd->obd_lock_replay_clients);
1859                         if (atomic_read(&obd->obd_lock_replay_clients) == 0)
1860                                 CDEBUG(D_HA, "all clients have replayed locks\n");
1861                         wake_up(&obd->obd_next_transno_waitq);
1862                 }
1863                 spin_unlock_bh(&obd->obd_processing_task_lock);
1864         }
1865
1866         return 0;
1867 }
1868
1869 int target_queue_recovery_request(struct ptlrpc_request *req,
1870                                   struct obd_device *obd)
1871 {
1872         struct list_head *tmp;
1873         int inserted = 0;
1874         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1875
1876         ENTRY;
1877
1878         if (obd->obd_recovery_data.trd_processing_task == cfs_curproc_pid()) {
1879                 /* Processing the queue right now, don't re-add. */
1880                 RETURN(1);
1881         }
1882
1883         target_process_req_flags(obd, req);
1884
1885         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1886                 /* client declares he's ready to complete recovery
1887                  * so, we put the request on th final queue */
1888                 req = ptlrpc_clone_req(req);
1889                 if (req == NULL)
1890                         RETURN(-ENOMEM);
1891                 DEBUG_REQ(D_HA, req, "queue final req");
1892                 spin_lock_bh(&obd->obd_processing_task_lock);
1893                 if (obd->obd_recovering)
1894                         list_add_tail(&req->rq_list, &obd->obd_final_req_queue);
1895                 else {
1896                         spin_unlock_bh(&obd->obd_processing_task_lock);
1897                         ptlrpc_free_clone(req);
1898                         if (obd->obd_stopping) {
1899                                 RETURN(-ENOTCONN);
1900                         } else {
1901                                 RETURN(1);
1902                         }
1903                 }
1904                 spin_unlock_bh(&obd->obd_processing_task_lock);
1905                 RETURN(0);
1906         }
1907         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1908                 /* client declares he's ready to replay locks */
1909                 req = ptlrpc_clone_req(req);
1910                 if (req == NULL)
1911                         RETURN(-ENOMEM);
1912                 DEBUG_REQ(D_HA, req, "queue lock replay req");
1913                 spin_lock_bh(&obd->obd_processing_task_lock);
1914                 LASSERT(obd->obd_recovering);
1915                 /* usually due to recovery abort */
1916                 if (!req->rq_export->exp_in_recovery) {
1917                         spin_unlock_bh(&obd->obd_processing_task_lock);
1918                         ptlrpc_free_clone(req);
1919                         RETURN(-ENOTCONN);
1920                 }
1921                 LASSERT(req->rq_export->exp_lock_replay_needed);
1922                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
1923                 spin_unlock_bh(&obd->obd_processing_task_lock);
1924                 wake_up(&obd->obd_next_transno_waitq);
1925                 RETURN(0);
1926         }
1927
1928         /* CAVEAT EMPTOR: The incoming request message has been swabbed
1929          * (i.e. buflens etc are in my own byte order), but type-dependent
1930          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
1931
1932         if (!transno) {
1933                 CFS_INIT_LIST_HEAD(&req->rq_list);
1934                 DEBUG_REQ(D_HA, req, "not queueing");
1935                 RETURN(1);
1936         }
1937
1938         spin_lock_bh(&obd->obd_processing_task_lock);
1939
1940         /* If we're processing the queue, we want don't want to queue this
1941          * message.
1942          *
1943          * Also, if this request has a transno less than the one we're waiting
1944          * for, we should process it now.  It could (and currently always will)
1945          * be an open request for a descriptor that was opened some time ago.
1946          *
1947          * Also, a resent, replayed request that has already been
1948          * handled will pass through here and be processed immediately.
1949          */
1950         CWARN("Next recovery transno: "LPU64", current: "LPU64", replaying: %i\n",
1951               obd->obd_next_recovery_transno, transno, obd->obd_req_replaying);
1952         if (transno < obd->obd_next_recovery_transno && obd->obd_req_replaying) {
1953                 /* Processing the queue right now, don't re-add. */
1954                 LASSERT(list_empty(&req->rq_list));
1955                 spin_unlock_bh(&obd->obd_processing_task_lock);
1956                 RETURN(1);
1957         }
1958         spin_unlock_bh(&obd->obd_processing_task_lock);
1959
1960         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
1961                 RETURN(0);
1962
1963         req = ptlrpc_clone_req(req);
1964         if (req == NULL)
1965                 RETURN(-ENOMEM);
1966
1967         spin_lock_bh(&obd->obd_processing_task_lock);
1968         LASSERT(obd->obd_recovering);
1969         if (!req->rq_export->exp_in_recovery) {
1970                 spin_unlock_bh(&obd->obd_processing_task_lock);
1971                 ptlrpc_free_clone(req);
1972                 RETURN(-ENOTCONN);
1973         }
1974         LASSERT(req->rq_export->exp_req_replay_needed);
1975
1976         if (target_exp_enqueue_req_replay(req)) {
1977                 spin_unlock_bh(&obd->obd_processing_task_lock);
1978                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
1979                 ptlrpc_free_clone(req);
1980                 RETURN(0);
1981         }
1982
1983         /* XXX O(n^2) */
1984         list_for_each(tmp, &obd->obd_req_replay_queue) {
1985                 struct ptlrpc_request *reqiter =
1986                         list_entry(tmp, struct ptlrpc_request, rq_list);
1987
1988                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
1989                         list_add_tail(&req->rq_list, &reqiter->rq_list);
1990                         inserted = 1;
1991                         break;
1992                 }
1993
1994                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
1995                              transno)) {
1996                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
1997                                   "has been claimed by another client");
1998                         spin_unlock_bh(&obd->obd_processing_task_lock);
1999                         target_exp_dequeue_req_replay(req);
2000                         ptlrpc_free_clone(req);
2001                         RETURN(0);
2002                 }
2003         }
2004
2005         if (!inserted)
2006                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2007
2008         obd->obd_requests_queued_for_recovery++;
2009         wake_up(&obd->obd_next_transno_waitq);
2010         spin_unlock_bh(&obd->obd_processing_task_lock);
2011         RETURN(0);
2012 }
2013
2014 struct obd_device * target_req2obd(struct ptlrpc_request *req)
2015 {
2016         return req->rq_export->exp_obd;
2017 }
2018
2019 static inline struct ldlm_pool *ldlm_exp2pl(struct obd_export *exp)
2020 {
2021         LASSERT(exp != NULL);
2022         return &exp->exp_obd->obd_namespace->ns_pool;
2023 }
2024
2025 /**
2026  * Packs current SLV and Limit into \a req.
2027  */
2028 int target_pack_pool_reply(struct ptlrpc_request *req)
2029 {
2030         struct obd_device *obd;
2031         ENTRY;
2032
2033         /*
2034          * Check that we still have all structures alive as this may
2035          * be some late rpc in shutdown time.
2036          */
2037         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2038                      !exp_connect_lru_resize(req->rq_export))) {
2039                 lustre_msg_set_slv(req->rq_repmsg, 0);
2040                 lustre_msg_set_limit(req->rq_repmsg, 0);
2041                 RETURN(0);
2042         }
2043
2044         /*
2045          * OBD is alive here as export is alive, which we checked above.
2046          */
2047         obd = req->rq_export->exp_obd;
2048
2049         read_lock(&obd->obd_pool_lock);
2050         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2051         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2052         read_unlock(&obd->obd_pool_lock);
2053
2054         RETURN(0);
2055 }
2056
2057 int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
2058 {
2059         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2060                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2061                 return (-ECOMM);
2062         }
2063
2064         if (unlikely(rc)) {
2065                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
2066                 req->rq_status = rc;
2067                 return (ptlrpc_send_error(req, 1));
2068         } else {
2069                 DEBUG_REQ(D_NET, req, "sending reply");
2070         }
2071
2072         return (ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT));
2073 }
2074
2075 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2076 {
2077         int                        netrc;
2078         struct ptlrpc_reply_state *rs;
2079         struct obd_device         *obd;
2080         struct obd_export         *exp;
2081         struct ptlrpc_service     *svc;
2082         ENTRY;
2083
2084         if (req->rq_no_reply) {
2085                 EXIT;
2086                 return;
2087         }
2088
2089         svc = req->rq_rqbd->rqbd_service;
2090         rs = req->rq_reply_state;
2091         if (rs == NULL || !rs->rs_difficult) {
2092                 /* no notifiers */
2093                 target_send_reply_msg (req, rc, fail_id);
2094                 EXIT;
2095                 return;
2096         }
2097
2098         /* must be an export if locks saved */
2099         LASSERT (req->rq_export != NULL);
2100         /* req/reply consistent */
2101         LASSERT (rs->rs_service == svc);
2102
2103         /* "fresh" reply */
2104         LASSERT (!rs->rs_scheduled);
2105         LASSERT (!rs->rs_scheduled_ever);
2106         LASSERT (!rs->rs_handled);
2107         LASSERT (!rs->rs_on_net);
2108         LASSERT (rs->rs_export == NULL);
2109         LASSERT (list_empty(&rs->rs_obd_list));
2110         LASSERT (list_empty(&rs->rs_exp_list));
2111
2112         exp = class_export_get (req->rq_export);
2113         obd = exp->exp_obd;
2114
2115         /* disable reply scheduling onto srv_reply_queue while I'm setting up */
2116         rs->rs_scheduled = 1;
2117         rs->rs_on_net    = 1;
2118         rs->rs_xid       = req->rq_xid;
2119         rs->rs_transno   = req->rq_transno;
2120         rs->rs_export    = exp;
2121
2122         spin_lock(&obd->obd_uncommitted_replies_lock);
2123
2124         CDEBUG(D_NET, "rs transno = "LPU64", last committed = "LPU64"\n",
2125                rs->rs_transno, obd->obd_last_committed);
2126         if (rs->rs_transno > obd->obd_last_committed) {
2127                 /* not committed already */
2128                 list_add_tail (&rs->rs_obd_list,
2129                                &obd->obd_uncommitted_replies);
2130         }
2131
2132         spin_unlock (&obd->obd_uncommitted_replies_lock);
2133         spin_lock (&exp->exp_lock);
2134
2135         list_add_tail (&rs->rs_exp_list, &exp->exp_outstanding_replies);
2136
2137         spin_unlock(&exp->exp_lock);
2138
2139         netrc = target_send_reply_msg (req, rc, fail_id);
2140
2141         spin_lock(&svc->srv_lock);
2142
2143         svc->srv_n_difficult_replies++;
2144
2145         if (netrc != 0) {
2146                 /* error sending: reply is off the net.  Also we need +1
2147                  * reply ref until ptlrpc_server_handle_reply() is done
2148                  * with the reply state (if the send was successful, there
2149                  * would have been +1 ref for the net, which
2150                  * reply_out_callback leaves alone) */
2151                 rs->rs_on_net = 0;
2152                 ptlrpc_rs_addref(rs);
2153                 atomic_inc (&svc->srv_outstanding_replies);
2154         }
2155
2156         if (rs->rs_transno <= obd->obd_last_committed ||
2157             (!rs->rs_on_net && !rs->rs_no_ack) ||
2158              list_empty(&rs->rs_exp_list) ||     /* completed already */
2159              list_empty(&rs->rs_obd_list)) {
2160                 CDEBUG(D_HA, "Schedule reply immediately\n");
2161                 list_add_tail (&rs->rs_list, &svc->srv_reply_queue);
2162                 cfs_waitq_signal (&svc->srv_waitq);
2163         } else {
2164                 list_add (&rs->rs_list, &svc->srv_active_replies);
2165                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
2166         }
2167
2168         spin_unlock(&svc->srv_lock);
2169         EXIT;
2170 }
2171
2172 int target_handle_ping(struct ptlrpc_request *req)
2173 {
2174         obd_ping(req->rq_export);
2175         return req_capsule_server_pack(&req->rq_pill);
2176 }
2177
2178 void target_committed_to_req(struct ptlrpc_request *req)
2179 {
2180         struct obd_device *obd;
2181
2182         if (req == NULL || req->rq_export == NULL)
2183                 return;
2184
2185         obd = req->rq_export->exp_obd;
2186         if (obd == NULL)
2187                 return;
2188
2189         if (!obd->obd_no_transno && req->rq_repmsg != NULL)
2190                 lustre_msg_set_last_committed(req->rq_repmsg,
2191                                               obd->obd_last_committed);
2192         else
2193                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2194                           "%d)", obd->obd_no_transno, req->rq_repmsg == NULL);
2195
2196         CDEBUG(D_INFO, "last_committed "LPU64", transno "LPU64", xid "LPU64"\n",
2197                obd->obd_last_committed, req->rq_transno, req->rq_xid);
2198 }
2199
2200 EXPORT_SYMBOL(target_committed_to_req);
2201
2202 int target_handle_qc_callback(struct ptlrpc_request *req)
2203 {
2204         struct obd_quotactl *oqctl;
2205         struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
2206
2207         oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2208         if (oqctl == NULL) {
2209                 CERROR("Can't unpack obd_quotactl\n");
2210                 RETURN(-EPROTO);
2211         }
2212
2213         cli->cl_qchk_stat = oqctl->qc_stat;
2214
2215         return 0;
2216 }
2217
2218 #ifdef HAVE_QUOTA_SUPPORT
2219 int target_handle_dqacq_callback(struct ptlrpc_request *req)
2220 {
2221 #ifdef __KERNEL__
2222         struct obd_device *obd = req->rq_export->exp_obd;
2223         struct obd_device *master_obd;
2224         struct obd_device_target *obt;
2225         struct lustre_quota_ctxt *qctxt;
2226         struct qunit_data *qdata = NULL;
2227         int rc = 0;
2228         ENTRY;
2229
2230         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_DROP_QUOTA_REQ))
2231                 RETURN(rc);
2232
2233         rc = req_capsule_server_pack(&req->rq_pill);
2234         if (rc) {
2235                 CERROR("packing reply failed!: rc = %d\n", rc);
2236                 RETURN(rc);
2237         }
2238
2239         LASSERT(req->rq_export);
2240
2241         OBD_ALLOC(qdata, sizeof(struct qunit_data));
2242         if (!qdata)
2243                 RETURN(-ENOMEM);
2244         rc = quota_get_qdata(req, qdata, QUOTA_REQUEST, QUOTA_EXPORT);
2245         if (rc < 0) {
2246                 CDEBUG(D_ERROR, "Can't unpack qunit_data(rc: %d)\n", rc);
2247                 GOTO(out, rc);
2248         }
2249
2250         /* we use the observer */
2251         if (!obd->obd_observer || !obd->obd_observer->obd_observer) {
2252                 CERROR("Can't find the observer, it is recovering\n");
2253                 req->rq_status = -EIO;
2254                 GOTO(send_reply, rc = -EIO);
2255         }
2256
2257         master_obd = obd->obd_observer->obd_observer;
2258         obt = &master_obd->u.obt;
2259         qctxt = &obt->obt_qctxt;
2260
2261         if (!qctxt->lqc_setup || !qctxt->lqc_valid) {
2262                 /* quota_type has not been processed yet, return EAGAIN
2263                  * until we know whether or not quotas are supposed to
2264                  * be enabled */
2265                 CDEBUG(D_QUOTA, "quota_type not processed yet, return "
2266                        "-EAGAIN\n");
2267                 req->rq_status = -EAGAIN;
2268                 rc = ptlrpc_reply(req);
2269                 GOTO(out, rc);
2270         }
2271
2272         down_read(&obt->obt_rwsem);
2273         if (qctxt->lqc_lqs_hash == NULL) {
2274                 up_read(&obt->obt_rwsem);
2275                 /* quota_type has not been processed yet, return EAGAIN
2276                  * until we know whether or not quotas are supposed to
2277                  * be enabled */
2278                 CDEBUG(D_QUOTA, "quota_ctxt is not ready yet, return "
2279                        "-EAGAIN\n");
2280                 req->rq_status = -EAGAIN;
2281                 rc = ptlrpc_reply(req);
2282                 GOTO(out, rc);
2283         }
2284
2285         LASSERT(qctxt->lqc_handler);
2286         rc = qctxt->lqc_handler(master_obd, qdata,
2287                                 lustre_msg_get_opc(req->rq_reqmsg));
2288         up_read(&obt->obt_rwsem);
2289         if (rc && rc != -EDQUOT)
2290                 CDEBUG(rc == -EBUSY  ? D_QUOTA : D_ERROR,
2291                        "dqacq failed! (rc:%d)\n", rc);
2292         req->rq_status = rc;
2293
2294         /* there are three forms of qunit(historic causes), so we need to
2295          * adjust the same form to different forms slaves needed */
2296         rc = quota_copy_qdata(req, qdata, QUOTA_REPLY, QUOTA_EXPORT);
2297         if (rc < 0) {
2298                 CDEBUG(D_ERROR, "Can't pack qunit_data(rc: %d)\n", rc);
2299                 GOTO(out, rc);
2300         }
2301
2302         /* Block the quota req. b=14840 */
2303         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_BLOCK_QUOTA_REQ, obd_timeout);
2304 send_reply:
2305         rc = ptlrpc_reply(req);
2306 out:
2307         OBD_FREE(qdata, sizeof(struct qunit_data));
2308         RETURN(rc);
2309 #else
2310         return 0;
2311 #endif /* !__KERNEL__ */
2312 }
2313 #endif /* HAVE_QUOTA_SUPPORT */
2314
2315 ldlm_mode_t lck_compat_array[] = {
2316         [LCK_EX] LCK_COMPAT_EX,
2317         [LCK_PW] LCK_COMPAT_PW,
2318         [LCK_PR] LCK_COMPAT_PR,
2319         [LCK_CW] LCK_COMPAT_CW,
2320         [LCK_CR] LCK_COMPAT_CR,
2321         [LCK_NL] LCK_COMPAT_NL,
2322         [LCK_GROUP] LCK_COMPAT_GROUP,
2323         [LCK_COS] LCK_COMPAT_COS,
2324 };
2325
2326 /**
2327  * Rather arbitrary mapping from LDLM error codes to errno values. This should
2328  * not escape to the user level.
2329  */
2330 int ldlm_error2errno(ldlm_error_t error)
2331 {
2332         int result;
2333
2334         switch (error) {
2335         case ELDLM_OK:
2336                 result = 0;
2337                 break;
2338         case ELDLM_LOCK_CHANGED:
2339                 result = -ESTALE;
2340                 break;
2341         case ELDLM_LOCK_ABORTED:
2342                 result = -ENAVAIL;
2343                 break;
2344         case ELDLM_LOCK_REPLACED:
2345                 result = -ESRCH;
2346                 break;
2347         case ELDLM_NO_LOCK_DATA:
2348                 result = -ENOENT;
2349                 break;
2350         case ELDLM_NAMESPACE_EXISTS:
2351                 result = -EEXIST;
2352                 break;
2353         case ELDLM_BAD_NAMESPACE:
2354                 result = -EBADF;
2355                 break;
2356         default:
2357                 if (((int)error) < 0)  /* cast to signed type */
2358                         result = error; /* as ldlm_error_t can be unsigned */
2359                 else {
2360                         CERROR("Invalid DLM result code: %i\n", error);
2361                         result = -EPROTO;
2362                 }
2363         }
2364         return result;
2365 }
2366 EXPORT_SYMBOL(ldlm_error2errno);
2367
2368 /**
2369  * Dual to ldlm_error2errno(): maps errno values back to ldlm_error_t.
2370  */
2371 ldlm_error_t ldlm_errno2error(int err_no)
2372 {
2373         int error;
2374
2375         switch (err_no) {
2376         case 0:
2377                 error = ELDLM_OK;
2378                 break;
2379         case -ESTALE:
2380                 error = ELDLM_LOCK_CHANGED;
2381                 break;
2382         case -ENAVAIL:
2383                 error = ELDLM_LOCK_ABORTED;
2384                 break;
2385         case -ESRCH:
2386                 error = ELDLM_LOCK_REPLACED;
2387                 break;
2388         case -ENOENT:
2389                 error = ELDLM_NO_LOCK_DATA;
2390                 break;
2391         case -EEXIST:
2392                 error = ELDLM_NAMESPACE_EXISTS;
2393                 break;
2394         case -EBADF:
2395                 error = ELDLM_BAD_NAMESPACE;
2396                 break;
2397         default:
2398                 error = err_no;
2399         }
2400         return error;
2401 }
2402 EXPORT_SYMBOL(ldlm_errno2error);
2403