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                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 239         } else {
 240                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 241                        name);
 242                 RETURN(-EINVAL);
 243         }
 244
 245         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 246                 CERROR("requires a TARGET UUID\n");
 247                 RETURN(-EINVAL);
 248         }
 249
 250         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 251                 CERROR("client UUID must be less than 38 characters\n");
 252                 RETURN(-EINVAL);
 253         }
 254
 255         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 256                 CERROR("setup requires a SERVER UUID\n");
 257                 RETURN(-EINVAL);
 258         }
 259
 260         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 261                 CERROR("target UUID must be less than 38 characters\n");
 262                 RETURN(-EINVAL);
 263         }
 264
 265         init_rwsem(&cli->cl_sem);
 266         sema_init(&cli->cl_mgc_sem, 1);
 267         cli->cl_conn_count = 0;
 268         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 269                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 270                      sizeof(server_uuid)));
 271
 272         cli->cl_dirty = 0;
 273         cli->cl_avail_grant = 0;
 274         /* FIXME: should limit this for the sum of all cl_dirty_max */
 275         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 276         if (cli->cl_dirty_max >> CFS_PAGE_SHIFT > num_physpages / 8)
 277                 cli->cl_dirty_max = num_physpages << (CFS_PAGE_SHIFT - 3);
 278         CFS_INIT_LIST_HEAD(&cli->cl_cache_waiters);
 279         CFS_INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 280         CFS_INIT_LIST_HEAD(&cli->cl_loi_write_list);
 281         CFS_INIT_LIST_HEAD(&cli->cl_loi_read_list);
 282         client_obd_list_lock_init(&cli->cl_loi_list_lock);
 283         cli->cl_r_in_flight = 0;
 284         cli->cl_w_in_flight = 0;
 285
 286         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 287         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 288         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 289         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 290         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 291         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 292         cfs_waitq_init(&cli->cl_destroy_waitq);
 293         atomic_set(&cli->cl_destroy_in_flight, 0);
 294 #ifdef ENABLE_CHECKSUM
 295         /* Turn on checksumming by default. */
 296         cli->cl_checksum = 1;
 297         /*
 298          * The supported checksum types will be worked out at connect time
 299          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 300          * through procfs.
 301          */
 302         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 303 #endif
 304         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 305
 306         /* This value may be changed at connect time in
 307            ptlrpc_connect_interpret. */
 308         cli->cl_max_pages_per_rpc = min((int)PTLRPC_MAX_BRW_PAGES,
 309                                         (int)(1024 * 1024 >> CFS_PAGE_SHIFT));
 310
 311         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 312                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
 313         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 128 /* MB */) {
 314                 cli->cl_max_rpcs_in_flight = 2;
 315         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 256 /* MB */) {
 316                 cli->cl_max_rpcs_in_flight = 3;
 317         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 512 /* MB */) {
 318                 cli->cl_max_rpcs_in_flight = 4;
 319         } else {
 320                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 321         }
 322
 323         rc = ldlm_get_ref();
 324         if (rc) {
 325                 CERROR("ldlm_get_ref failed: %d\n", rc);
 326                 GOTO(err, rc);
 327         }
 328
 329         ptlrpc_init_client(rq_portal, rp_portal, name,
 330                            &obddev->obd_ldlm_client);
 331
 332         imp = class_new_import(obddev);
 333         if (imp == NULL)
 334                 GOTO(err_ldlm, rc = -ENOENT);
 335         imp->imp_client = &obddev->obd_ldlm_client;
 336         imp->imp_connect_op = connect_op;
 337         imp->imp_initial_recov = 1;
 338         imp->imp_initial_recov_bk = 0;
 339         CFS_INIT_LIST_HEAD(&imp->imp_pinger_chain);
 340         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 341                LUSTRE_CFG_BUFLEN(lcfg, 1));
 342         class_import_put(imp);
 343
 344         rc = client_import_add_conn(imp, &server_uuid, 1);
 345         if (rc) {
 346                 CERROR("can't add initial connection\n");
 347                 GOTO(err_import, rc);
 348         }
 349
 350         cli->cl_import = imp;
 351         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 352         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 353         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 354
 355         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 356                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 357                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 358                                name, obddev->obd_name,
 359                                cli->cl_target_uuid.uuid);
 360                         spin_lock(&imp->imp_lock);
 361                         imp->imp_invalid = 1;
 362                         spin_unlock(&imp->imp_lock);
 363                 }
 364         }
 365
 366         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 367
 368         RETURN(rc);
 369
 370 err_import:
 371         class_destroy_import(imp);
 372 err_ldlm:
 373         ldlm_put_ref();
 374 err:
 375         RETURN(rc);
 376
 377 }
 378
 379 int client_obd_cleanup(struct obd_device *obddev)
 380 {
 381         ENTRY;
 382         ldlm_put_ref();
 383         RETURN(0);
 384 }
 385
 386 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 387 int client_connect_import(const struct lu_env *env,
 388                           struct obd_export **exp,
 389                           struct obd_device *obd, struct obd_uuid *cluuid,
 390                           struct obd_connect_data *data, void *localdata)
 391 {
 392         struct client_obd *cli = &obd->u.cli;
 393         struct obd_import *imp = cli->cl_import;
 394         struct obd_connect_data *ocd;
 395         struct ldlm_namespace *to_be_freed = NULL;
 396         struct lustre_handle conn = { 0 };
 397         int rc;
 398         ENTRY;
 399
 400         *exp = NULL;
 401         down_write(&cli->cl_sem);
 402         rc = class_connect(&conn, obd, cluuid);
 403         if (rc)
 404                 GOTO(out_sem, rc);
 405
 406         *exp = class_conn2export(&conn);
 407
 408         cli->cl_conn_count++;
 409         if (cli->cl_conn_count > 1)
 410                 GOTO(out_sem, rc);
 411
 412         if (obd->obd_namespace != NULL)
 413                 CERROR("already have namespace!\n");
 414         obd->obd_namespace = ldlm_namespace_new(obd, obd->obd_name,
 415                                                 LDLM_NAMESPACE_CLIENT,
 416                                                 LDLM_NAMESPACE_GREEDY);
 417         if (obd->obd_namespace == NULL)
 418                 GOTO(out_disco, rc = -ENOMEM);
 419
 420         imp->imp_dlm_handle = conn;
 421         rc = ptlrpc_init_import(imp);
 422         if (rc != 0)
 423                 GOTO(out_ldlm, rc);
 424
 425         ocd = &imp->imp_connect_data;
 426         if (data) {
 427                 *ocd = *data;
 428                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 429         }
 430
 431         rc = ptlrpc_connect_import(imp, NULL);
 432         if (rc != 0) {
 433                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 434                 GOTO(out_ldlm, rc);
 435         }
 436         LASSERT((*exp)->exp_connection);
 437
 438         if (data) {
 439                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 440                          ocd->ocd_connect_flags, "old "LPX64", new "LPX64"\n",
 441                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 442                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 443         }
 444
 445         ptlrpc_pinger_add_import(imp);
 446
 447         EXIT;
 448
 449         if (rc) {
 450 out_ldlm:
 451                 ldlm_namespace_free_prior(obd->obd_namespace, imp, 0);
 452                 to_be_freed = obd->obd_namespace;
 453                 obd->obd_namespace = NULL;
 454 out_disco:
 455                 cli->cl_conn_count--;
 456                 class_disconnect(*exp);
 457                 *exp = NULL;
 458         }
 459 out_sem:
 460         up_write(&cli->cl_sem);
 461         if (to_be_freed)
 462                 ldlm_namespace_free_post(to_be_freed);
 463
 464         return rc;
 465 }
 466
 467 int client_disconnect_export(struct obd_export *exp)
 468 {
 469         struct obd_device *obd = class_exp2obd(exp);
 470         struct client_obd *cli;
 471         struct obd_import *imp;
 472         int rc = 0, err;
 473         struct ldlm_namespace *to_be_freed = NULL;
 474         ENTRY;
 475
 476         if (!obd) {
 477                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 478                        exp, exp ? exp->exp_handle.h_cookie : -1);
 479                 RETURN(-EINVAL);
 480         }
 481
 482         cli = &obd->u.cli;
 483         imp = cli->cl_import;
 484
 485         down_write(&cli->cl_sem);
 486         if (!cli->cl_conn_count) {
 487                 CERROR("disconnecting disconnected device (%s)\n",
 488                        obd->obd_name);
 489                 GOTO(out_sem, rc = -EINVAL);
 490         }
 491
 492         cli->cl_conn_count--;
 493         if (cli->cl_conn_count)
 494                 GOTO(out_no_disconnect, rc = 0);
 495
 496         /* Mark import deactivated now, so we don't try to reconnect if any
 497          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
 498          * fully deactivate the import, or that would drop all requests. */
 499         spin_lock(&imp->imp_lock);
 500         imp->imp_deactive = 1;
 501         spin_unlock(&imp->imp_lock);
 502
 503         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 504          * delete it regardless.  (It's safe to delete an import that was
 505          * never added.) */
 506         (void)ptlrpc_pinger_del_import(imp);
 507
 508         if (obd->obd_namespace != NULL) {
 509                 /* obd_force == local only */
 510                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 511                                        obd->obd_force ? LDLM_FL_LOCAL_ONLY:0,
 512                                        NULL);
 513                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 514                 to_be_freed = obd->obd_namespace;
 515         }
 516
 517         /*
 518          * there's no necessary to hold sem during diconnecting an import,
 519          * and actually it may cause deadlock in gss.
 520          */
 521         up_write(&cli->cl_sem);
 522         rc = ptlrpc_disconnect_import(imp, 0);
 523         down_write(&cli->cl_sem);
 524
 525         ptlrpc_invalidate_import(imp);
 526         /* set obd_namespace to NULL only after invalidate, because we can have
 527          * some connect requests in flight, and his need store a connect flags
 528          * in obd_namespace. bug 14260 */
 529         obd->obd_namespace = NULL;
 530
 531         if (imp->imp_rq_pool) {
 532                 ptlrpc_free_rq_pool(imp->imp_rq_pool);
 533                 imp->imp_rq_pool = NULL;
 534         }
 535         destroy_import(imp);
 536         cli->cl_import = NULL;
 537
 538         EXIT;
 539  out_no_disconnect:
 540         err = class_disconnect(exp);
 541         if (!rc && err)
 542                 rc = err;
 543  out_sem:
 544         up_write(&cli->cl_sem);
 545         if (to_be_freed)
 546                 ldlm_namespace_free_post(to_be_freed);
 547
 548         RETURN(rc);
 549 }
 550
 551 /* --------------------------------------------------------------------------
 552  * from old lib/target.c
 553  * -------------------------------------------------------------------------- */
 554
 555 int target_handle_reconnect(struct lustre_handle *conn, struct obd_export *exp,
 556                             struct obd_uuid *cluuid, int mds_conn)
 557 {
 558         ENTRY;
 559         if (exp->exp_connection && exp->exp_imp_reverse && !mds_conn) {
 560                 struct lustre_handle *hdl;
 561                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 562                 /* Might be a re-connect after a partition. */
 563                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 564                         CWARN("%s: %s reconnecting\n", exp->exp_obd->obd_name,
 565                               cluuid->uuid);
 566                         conn->cookie = exp->exp_handle.h_cookie;
 567                         /* target_handle_connect() treats EALREADY and
 568                          * -EALREADY differently.  EALREADY means we are
 569                          * doing a valid reconnect from the same client. */
 570                         RETURN(EALREADY);
 571                 } else {
 572                         CERROR("%s reconnecting from %s, "
 573                                "handle mismatch (ours "LPX64", theirs "
 574                                LPX64")\n", cluuid->uuid,
 575                                exp->exp_connection->c_remote_uuid.uuid,
 576                                hdl->cookie, conn->cookie);
 577                         memset(conn, 0, sizeof *conn);
 578                         /* target_handle_connect() treats EALREADY and
 579                          * -EALREADY differently.  -EALREADY is an error
 580                          * (same UUID, different handle). */
 581                         RETURN(-EALREADY);
 582                 }
 583         }
 584
 585         conn->cookie = exp->exp_handle.h_cookie;
 586         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
 587                cluuid->uuid, exp, conn->cookie);
 588         RETURN(0);
 589 }
 590
 591 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
 592                           int error)
 593 {
 594         struct obd_export *exp = cb_data;
 595
 596         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 597                obd->obd_name, exp->exp_client_uuid.uuid);
 598
 599         spin_lock(&exp->exp_lock);
 600         exp->exp_need_sync = 0;
 601         spin_unlock(&exp->exp_lock);
 602 }
 603 EXPORT_SYMBOL(target_client_add_cb);
 604 static void
 605 target_start_and_reset_recovery_timer(struct obd_device *obd,
 606                                       struct ptlrpc_request *req,
 607                                       int new_client);
 608
 609 int target_handle_connect(struct ptlrpc_request *req)
 610 {
 611         struct obd_device *target, *targref = NULL;
 612         struct obd_export *export = NULL;
 613         struct obd_import *revimp;
 614         struct lustre_handle conn;
 615         struct lustre_handle *tmp;
 616         struct obd_uuid tgtuuid;
 617         struct obd_uuid cluuid;
 618         struct obd_uuid remote_uuid;
 619         char *str;
 620         int rc = 0;
 621         int mds_conn = 0;
 622         struct obd_connect_data *data, *tmpdata;
 623         lnet_nid_t *client_nid = NULL;
 624         ENTRY;
 625
 626         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 627
 628         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 629         if (str == NULL) {
 630                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 631                 GOTO(out, rc = -EINVAL);
 632         }
 633
 634         obd_str2uuid(&tgtuuid, str);
 635         target = class_uuid2obd(&tgtuuid);
 636         if (!target)
 637                 target = class_name2obd(str);
 638
 639         if (!target || target->obd_stopping || !target->obd_set_up) {
 640                 LCONSOLE_ERROR_MSG(0x137, "UUID '%s' is not available "
 641                                    " for connect (%s)\n", str,
 642                                    !target ? "no target" :
 643                                    (target->obd_stopping ? "stopping" :
 644                                    "not set up"));
 645                 GOTO(out, rc = -ENODEV);
 646         }
 647
 648         if (target->obd_no_conn) {
 649                 LCONSOLE_WARN("%s: temporarily refusing client connection "
 650                               "from %s\n", target->obd_name,
 651                               libcfs_nid2str(req->rq_peer.nid));
 652                 GOTO(out, rc = -EAGAIN);
 653         }
 654
 655         /* Make sure the target isn't cleaned up while we're here. Yes,
 656            there's still a race between the above check and our incref here.
 657            Really, class_uuid2obd should take the ref. */
 658         targref = class_incref(target, __FUNCTION__, cfs_current());
 659
 660
 661         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
 662         if (str == NULL) {
 663                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
 664                 GOTO(out, rc = -EINVAL);
 665         }
 666
 667         obd_str2uuid(&cluuid, str);
 668
 669         /* XXX extract a nettype and format accordingly */
 670         switch (sizeof(lnet_nid_t)) {
 671                 /* NB the casts only avoid compiler warnings */
 672         case 8:
 673                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 674                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
 675                 break;
 676         case 4:
 677                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 678                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
 679                 break;
 680         default:
 681                 LBUG();
 682         }
 683
 684         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 685         if (tmp == NULL)
 686                 GOTO(out, rc = -EPROTO);
 687
 688         conn = *tmp;
 689
 690         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 691         if (!data)
 692                 GOTO(out, rc = -EPROTO);
 693
 694         rc = req_capsule_server_pack(&req->rq_pill);
 695         if (rc)
 696                 GOTO(out, rc);
 697
 698         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 699                 if (!data) {
 700                         DEBUG_REQ(D_WARNING, req, "Refusing old (unversioned) "
 701                                   "libclient connection attempt");
 702                         GOTO(out, rc = -EPROTO);
 703                 } else if (data->ocd_version < LUSTRE_VERSION_CODE -
 704                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
 705                            data->ocd_version > LUSTRE_VERSION_CODE +
 706                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
 707                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
 708                                   "libclient connection attempt",
 709                                   data->ocd_version < LUSTRE_VERSION_CODE ?
 710                                   "old" : "new",
 711                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
 712                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
 713                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
 714                                   OBD_OCD_VERSION_FIX(data->ocd_version));
 715                         data = req_capsule_server_sized_get(&req->rq_pill,
 716                                                         &RMF_CONNECT_DATA,
 717                                     offsetof(typeof(*data), ocd_version) +
 718                                              sizeof(data->ocd_version));
 719                         if (data) {
 720                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
 721                                 data->ocd_version = LUSTRE_VERSION_CODE;
 722                         }
 723                         GOTO(out, rc = -EPROTO);
 724                 }
 725         }
 726
 727         if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) &&
 728             (data->ocd_connect_flags & OBD_CONNECT_MDS))
 729                 mds_conn = 1;
 730
 731         /* lctl gets a backstage, all-access pass. */
 732         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 733                 goto dont_check_exports;
 734
 735         spin_lock(&target->obd_dev_lock);
 736         export = lustre_hash_lookup(target->obd_uuid_hash, &cluuid);
 737
 738         if (export != NULL && export->exp_connecting) { /* bug 9635, et. al. */
 739                 CWARN("%s: exp %p already connecting\n",
 740                       export->exp_obd->obd_name, export);
 741                 class_export_put(export);
 742                 export = NULL;
 743                 rc = -EALREADY;
 744         } else if (export != NULL && export->exp_connection != NULL &&
 745                    req->rq_peer.nid != export->exp_connection->c_peer.nid &&
 746                    !mds_conn) {
 747                 /* in mds failover we have static uuid but nid can be
 748                  * changed*/
 749                 CWARN("%s: cookie %s seen on new NID %s when "
 750                       "existing NID %s is already connected\n",
 751                       target->obd_name, cluuid.uuid,
 752                       libcfs_nid2str(req->rq_peer.nid),
 753                       libcfs_nid2str(export->exp_connection->c_peer.nid));
 754                 rc = -EALREADY;
 755                 class_export_put(export);
 756                 export = NULL;
 757         } else if (export != NULL) {
 758                 spin_lock(&export->exp_lock);
 759                 export->exp_connecting = 1;
 760                 spin_unlock(&export->exp_lock);
 761                 class_export_put(export);
 762                 spin_unlock(&target->obd_dev_lock);
 763                 LASSERT(export->exp_obd == target);
 764
 765                 rc = target_handle_reconnect(&conn, export, &cluuid, mds_conn);
 766         }
 767
 768         /* If we found an export, we already unlocked. */
 769         if (!export) {
 770                 spin_unlock(&target->obd_dev_lock);
 771                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
 772         } else if (req->rq_export == NULL &&
 773                    atomic_read(&export->exp_rpc_count) > 0) {
 774                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
 775                       target->obd_name, cluuid.uuid,
 776                       libcfs_nid2str(req->rq_peer.nid),
 777                       export, atomic_read(&export->exp_refcount));
 778                 GOTO(out, rc = -EBUSY);
 779         } else if (req->rq_export != NULL &&
 780                    (atomic_read(&export->exp_rpc_count) > 1)) {
 781                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
 782                       target->obd_name, cluuid.uuid,
 783                       libcfs_nid2str(req->rq_peer.nid),
 784                       export, atomic_read(&export->exp_rpc_count));
 785                 GOTO(out, rc = -EBUSY);
 786         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
 787                    !mds_conn) {
 788                 CERROR("%s: NID %s (%s) reconnected with 1 conn_cnt; "
 789                        "cookies not random?\n", target->obd_name,
 790                        libcfs_nid2str(req->rq_peer.nid), cluuid.uuid);
 791                 GOTO(out, rc = -EALREADY);
 792         } else {
 793                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
 794                 if (req->rq_export == NULL && mds_conn)
 795                        export->exp_last_request_time =
 796                                max(export->exp_last_request_time,
 797                                    (time_t)cfs_time_current_sec());
 798         }
 799
 800         if (rc < 0) {
 801                 GOTO(out, rc);
 802         }
 803
 804         CWARN("%s: connection from %s@%s %st"LPU64" exp %p cur %ld last %ld\n",
 805                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 806               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
 807               export, (long)cfs_time_current_sec(),
 808               export ? (long)export->exp_last_request_time : 0);
 809
 810         /* Tell the client if we're in recovery. */
 811         if (target->obd_recovering) {
 812                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 813                 /* If this is the first time a client connects,
 814                    reset the recovery timer */
 815                 if (rc == 0)
 816                         target_start_and_reset_recovery_timer(target, req,
 817                                                               !export);
 818         }
 819
 820         /* We want to handle EALREADY but *not* -EALREADY from
 821          * target_handle_reconnect(), return reconnection state in a flag */
 822         if (rc == EALREADY) {
 823                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 824                 rc = 0;
 825         } else {
 826                 LASSERT(rc == 0);
 827         }
 828
 829         /* Tell the client if we support replayable requests */
 830         if (target->obd_replayable)
 831                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 832         client_nid = &req->rq_peer.nid;
 833
 834         if (export == NULL) {
 835                 if (target->obd_recovering) {
 836                         cfs_time_t t;
 837
 838                         t = cfs_timer_deadline(&target->obd_recovery_timer);
 839                         t = cfs_time_sub(t, cfs_time_current());
 840                         CERROR("%s: denying connection for new client %s (%s): "
 841                                "%d clients in recovery for "CFS_TIME_T"s\n",
 842                                target->obd_name,
 843                                libcfs_nid2str(req->rq_peer.nid), cluuid.uuid,
 844                                target->obd_recoverable_clients,
 845                                cfs_duration_sec(t));
 846                         rc = -EBUSY;
 847                 } else {
 848 dont_check_exports:
 849                         rc = obd_connect(req->rq_svc_thread->t_env,
 850                                          &export, target, &cluuid, data,
 851                                          client_nid);
 852                         if (rc == 0)
 853                                 conn.cookie = export->exp_handle.h_cookie;
 854                 }
 855         } else {
 856                 rc = obd_reconnect(req->rq_svc_thread->t_env,
 857                                    export, target, &cluuid, data, client_nid);
 858                 if (rc == 0)
 859                         /* prevous done via class_conn2export */
 860                         class_export_get(export);
 861         }
 862         if (rc)
 863                 GOTO(out, rc);
 864         /* Return only the parts of obd_connect_data that we understand, so the
 865          * client knows that we don't understand the rest. */
 866         if (data) {
 867                  tmpdata = req_capsule_server_get(&req->rq_pill,
 868                                                   &RMF_CONNECT_DATA);
 869                   //data->ocd_connect_flags &= OBD_CONNECT_SUPPORTED;
 870                  *tmpdata = *data;
 871         }
 872
 873         /* If all else goes well, this is our RPC return code. */
 874         req->rq_status = 0;
 875
 876         lustre_msg_set_handle(req->rq_repmsg, &conn);
 877
 878         /* If the client and the server are the same node, we will already
 879          * have an export that really points to the client's DLM export,
 880          * because we have a shared handles table.
 881          *
 882          * XXX this will go away when shaver stops sending the "connect" handle
 883          * in the real "remote handle" field of the request --phik 24 Apr 2003
 884          */
 885         if (req->rq_export != NULL)
 886                 class_export_put(req->rq_export);
 887
 888         req->rq_export = export;
 889
 890         spin_lock(&export->exp_lock);
 891         if (mds_conn) {
 892                 lustre_msg_set_conn_cnt(req->rq_repmsg, export->exp_conn_cnt + 1);
 893         } else if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
 894                 spin_unlock(&export->exp_lock);
 895                 CERROR("%s: %s already connected at higher conn_cnt: %d > %d\n",
 896                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 897                        export->exp_conn_cnt,
 898                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
 899
 900                 GOTO(out, rc = -EALREADY);
 901         }
 902         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
 903
 904         /* request from liblustre?  Don't evict it for not pinging. */
 905         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 906                 export->exp_libclient = 1;
 907                 spin_unlock(&export->exp_lock);
 908
 909                 spin_lock(&target->obd_dev_lock);
 910                 list_del_init(&export->exp_obd_chain_timed);
 911                 spin_unlock(&target->obd_dev_lock);
 912         } else {
 913                 spin_unlock(&export->exp_lock);
 914         }
 915
 916         if (export->exp_connection != NULL)
 917                 ptlrpc_connection_put(export->exp_connection);
 918         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
 919                                                        req->rq_self,
 920                                                        &remote_uuid);
 921         if (hlist_unhashed(&export->exp_nid_hash)) {
 922                 lustre_hash_add_unique(export->exp_obd->obd_nid_hash,
 923                                        &export->exp_connection->c_peer.nid,
 924                                        &export->exp_nid_hash);
 925         }
 926
 927         spin_lock_bh(&target->obd_processing_task_lock);
 928         if (target->obd_recovering && !export->exp_in_recovery) {
 929                 spin_lock(&export->exp_lock);
 930                 export->exp_in_recovery = 1;
 931                 export->exp_req_replay_needed = 1;
 932                 export->exp_lock_replay_needed = 1;
 933                 spin_unlock(&export->exp_lock);
 934                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
 935                      && (data->ocd_transno == 0))
 936                         CWARN("Connect with zero transno!\n");
 937
 938                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
 939                      && data->ocd_transno < target->obd_next_recovery_transno)
 940                         target->obd_next_recovery_transno = data->ocd_transno;
 941                 target->obd_connected_clients++;
 942                 /* each connected client is counted as recoverable */
 943                 target->obd_recoverable_clients++;
 944                 atomic_inc(&target->obd_req_replay_clients);
 945                 atomic_inc(&target->obd_lock_replay_clients);
 946                 if (target->obd_connected_clients ==
 947                     target->obd_max_recoverable_clients)
 948                         wake_up(&target->obd_next_transno_waitq);
 949         }
 950         spin_unlock_bh(&target->obd_processing_task_lock);
 951         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 952         conn = *tmp;
 953
 954         if (export->exp_imp_reverse != NULL) {
 955                 /* destroyed import can be still referenced in ctxt */
 956                 obd_set_info_async(export, sizeof(KEY_REVIMP_UPD),
 957                                    KEY_REVIMP_UPD, 0, NULL, NULL);
 958
 959                 /* in some recovery senarios, previous ctx init rpc handled
 960                  * in sptlrpc_target_export_check() might be used to install
 961                  * a reverse ctx in this reverse import, and later OBD_CONNECT
 962                  * using the same gss ctx could reach here and following new
 963                  * reverse import. note all reverse ctx in new/old import are
 964                  * actually based on the same gss ctx. so we invalidate ctx
 965                  * here before destroy import, otherwise flush old import will
 966                  * lead to remote reverse ctx be destroied, thus the reverse
 967                  * ctx of new import will lost its peer.
 968                  * there might be a better way to deal with this???
 969                  */
 970                 sptlrpc_import_inval_all_ctx(export->exp_imp_reverse);
 971
 972                 destroy_import(export->exp_imp_reverse);
 973         }
 974
 975         /* for the rest part, we return -ENOTCONN in case of errors
 976          * in order to let client initialize connection again.
 977          */
 978         revimp = export->exp_imp_reverse = class_new_import(target);
 979         if (!revimp) {
 980                 CERROR("fail to alloc new reverse import.\n");
 981                 GOTO(out, rc = -ENOTCONN);
 982         }
 983
 984         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
 985         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
 986         revimp->imp_remote_handle = conn;
 987         revimp->imp_dlm_fake = 1;
 988         revimp->imp_state = LUSTRE_IMP_FULL;
 989
 990         /* unknown versions will be caught in
 991          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
 992         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
 993
 994         if ((export->exp_connect_flags & OBD_CONNECT_AT) &&
 995             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
 996                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 997         else
 998                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 999
1000         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
1001         if (rc) {
1002                 CERROR("Failed to get sec for reverse import: %d\n", rc);
1003                 export->exp_imp_reverse = NULL;
1004                 class_destroy_import(revimp);
1005         }
1006
1007         class_import_put(revimp);
1008 out:
1009         if (export) {
1010                 spin_lock(&export->exp_lock);
1011                 export->exp_connecting = 0;
1012                 spin_unlock(&export->exp_lock);
1013         }
1014         if (targref)
1015                 class_decref(targref, __FUNCTION__, cfs_current());
1016         if (rc)
1017                 req->rq_status = rc;
1018         RETURN(rc);
1019 }
1020
1021 int target_handle_disconnect(struct ptlrpc_request *req)
1022 {
1023         int rc;
1024         ENTRY;
1025
1026         rc = req_capsule_server_pack(&req->rq_pill);
1027         if (rc)
1028                 RETURN(rc);
1029
1030         /* keep the rq_export around so we can send the reply */
1031         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1032
1033         RETURN(0);
1034 }
1035
1036 void target_destroy_export(struct obd_export *exp)
1037 {
1038         /* exports created from last_rcvd data, and "fake"
1039            exports created by lctl don't have an import */
1040         if (exp->exp_imp_reverse != NULL)
1041                 destroy_import(exp->exp_imp_reverse);
1042
1043         /* We cancel locks at disconnect time, but this will catch any locks
1044          * granted in a race with recovery-induced disconnect. */
1045         if (exp->exp_obd->obd_namespace != NULL)
1046                 ldlm_cancel_locks_for_export(exp);
1047 }
1048
1049 /*
1050  * Recovery functions
1051  */
1052
1053 struct ptlrpc_request *ptlrpc_clone_req( struct ptlrpc_request *orig_req)
1054 {
1055         struct ptlrpc_request *copy_req;
1056         struct lustre_msg *copy_reqmsg;
1057         struct ptlrpc_user_desc *udesc = NULL;
1058
1059         OBD_ALLOC_PTR(copy_req);
1060         if (!copy_req)
1061                 return NULL;
1062         OBD_ALLOC(copy_reqmsg, orig_req->rq_reqlen);
1063         if (!copy_reqmsg){
1064                 OBD_FREE_PTR(copy_req);
1065                 return NULL;
1066         }
1067
1068         if (orig_req->rq_user_desc) {
1069                 int ngroups = orig_req->rq_user_desc->pud_ngroups;
1070
1071                 OBD_ALLOC(udesc, sptlrpc_user_desc_size(ngroups));
1072                 if (!udesc) {
1073                         OBD_FREE(copy_reqmsg, orig_req->rq_reqlen);
1074                         OBD_FREE_PTR(copy_req);
1075                         return NULL;
1076                 }
1077                 memcpy(udesc, orig_req->rq_user_desc,
1078                        sptlrpc_user_desc_size(ngroups));
1079         }
1080
1081         *copy_req = *orig_req;
1082         memcpy(copy_reqmsg, orig_req->rq_reqmsg, orig_req->rq_reqlen);
1083         copy_req->rq_reqmsg = copy_reqmsg;
1084         copy_req->rq_user_desc = udesc;
1085
1086         class_export_rpc_get(copy_req->rq_export);
1087         CFS_INIT_LIST_HEAD(&copy_req->rq_list);
1088         CFS_INIT_LIST_HEAD(&copy_req->rq_replay_list);
1089         sptlrpc_svc_ctx_addref(copy_req);
1090
1091         if (copy_req->rq_reply_state) {
1092                 /* the copied req takes over the reply state */
1093                 orig_req->rq_reply_state = NULL;
1094                 /* to catch further access */
1095                 orig_req->rq_repmsg = NULL;
1096                 orig_req->rq_replen = 0;
1097         }
1098
1099         return copy_req;
1100 }
1101
1102 void ptlrpc_free_clone(struct ptlrpc_request *req)
1103 {
1104         LASSERT(list_empty(&req->rq_replay_list));
1105
1106         ptlrpc_req_drop_rs(req);
1107         sptlrpc_svc_ctx_decref(req);
1108         class_export_rpc_put(req->rq_export);
1109         list_del_init(&req->rq_list);
1110
1111         if (req->rq_user_desc) {
1112                 int ngroups = req->rq_user_desc->pud_ngroups;
1113                 OBD_FREE(req->rq_user_desc, sptlrpc_user_desc_size(ngroups));
1114         }
1115         OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
1116         OBD_FREE_PTR(req);
1117 }
1118
1119 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1120 {
1121         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1122         struct obd_export     *exp = req->rq_export;
1123         struct ptlrpc_request *reqiter;
1124         int                    dup = 0;
1125
1126         LASSERT(exp);
1127
1128         spin_lock(&exp->exp_lock);
1129         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1130                             rq_replay_list) {
1131                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1132                         dup = 1;
1133                         break;
1134                 }
1135         }
1136
1137         if (dup) {
1138                 /* we expect it with RESENT and REPLAY flags */
1139                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1140                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1141                         CERROR("invalid flags %x of resent replay\n",
1142                                lustre_msg_get_flags(req->rq_reqmsg));
1143         } else {
1144                 list_add_tail(&req->rq_replay_list, &exp->exp_req_replay_queue);
1145         }
1146
1147         spin_unlock(&exp->exp_lock);
1148         return dup;
1149 }
1150
1151 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1152 {
1153         LASSERT(!list_empty(&req->rq_replay_list));
1154         LASSERT(req->rq_export);
1155
1156         spin_lock(&req->rq_export->exp_lock);
1157         list_del_init(&req->rq_replay_list);
1158         spin_unlock(&req->rq_export->exp_lock);
1159 }
1160
1161 #ifdef __KERNEL__
1162 static void target_finish_recovery(struct obd_device *obd)
1163 {
1164         ENTRY;
1165         LCONSOLE_INFO("%s: sending delayed replies to recovered clients\n",
1166                       obd->obd_name);
1167
1168         ldlm_reprocess_all_ns(obd->obd_namespace);
1169         spin_lock_bh(&obd->obd_processing_task_lock);
1170         if (list_empty(&obd->obd_req_replay_queue) &&
1171             list_empty(&obd->obd_lock_replay_queue) &&
1172             list_empty(&obd->obd_final_req_queue)) {
1173                 obd->obd_processing_task = 0;
1174         } else {
1175                 CERROR("%s: Recovery queues ( %s%s%s) are empty\n",
1176                        obd->obd_name,
1177                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1178                        list_empty(&obd->obd_lock_replay_queue) ? "" : "lock ",
1179                        list_empty(&obd->obd_final_req_queue) ? "" : "final ");
1180                 spin_unlock_bh(&obd->obd_processing_task_lock);
1181                 LBUG();
1182         }
1183         spin_unlock_bh(&obd->obd_processing_task_lock);
1184
1185         /* when recovery finished, cleanup orphans on mds and ost */
1186         if (OBT(obd) && OBP(obd, postrecov)) {
1187                 int rc = OBP(obd, postrecov)(obd);
1188                 LCONSOLE_WARN("%s: recovery %s: rc %d\n", obd->obd_name,
1189                               rc < 0 ? "failed" : "complete", rc);
1190         }
1191
1192         obd->obd_recovery_end = cfs_time_current_sec();
1193         EXIT;
1194 }
1195
1196 static void abort_req_replay_queue(struct obd_device *obd)
1197 {
1198         struct ptlrpc_request *req, *n;
1199         struct list_head abort_list;
1200
1201         CFS_INIT_LIST_HEAD(&abort_list);
1202         spin_lock_bh(&obd->obd_processing_task_lock);
1203         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1204         spin_unlock_bh(&obd->obd_processing_task_lock);
1205         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1206                 DEBUG_REQ(D_WARNING, req, "aborted:");
1207                 req->rq_status = -ENOTCONN;
1208                 if (ptlrpc_error(req)) {
1209                         DEBUG_REQ(D_ERROR, req,
1210                                   "failed abort_req_reply; skipping");
1211                 }
1212                 target_exp_dequeue_req_replay(req);
1213                 ptlrpc_free_clone(req);
1214         }
1215 }
1216
1217 static void abort_lock_replay_queue(struct obd_device *obd)
1218 {
1219         struct ptlrpc_request *req, *n;
1220         struct list_head abort_list;
1221
1222         CFS_INIT_LIST_HEAD(&abort_list);
1223         spin_lock_bh(&obd->obd_processing_task_lock);
1224         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1225         spin_unlock_bh(&obd->obd_processing_task_lock);
1226         list_for_each_entry_safe(req, n, &obd->obd_lock_replay_queue, rq_list){
1227                 DEBUG_REQ(D_ERROR, req, "aborted:");
1228                 req->rq_status = -ENOTCONN;
1229                 if (ptlrpc_error(req)) {
1230                         DEBUG_REQ(D_ERROR, req,
1231                                   "failed abort_lock_reply; skipping");
1232                 }
1233                 ptlrpc_free_clone(req);
1234         }
1235 }
1236 #endif
1237
1238 /* Called from a cleanup function if the device is being cleaned up
1239    forcefully.  The exports should all have been disconnected already,
1240    the only thing left to do is
1241      - clear the recovery flags
1242      - cancel the timer
1243      - free queued requests and replies, but don't send replies
1244    Because the obd_stopping flag is set, no new requests should be received.
1245
1246 */
1247 void target_cleanup_recovery(struct obd_device *obd)
1248 {
1249         struct ptlrpc_request *req, *n;
1250         struct list_head clean_list;
1251         ENTRY;
1252
1253         LASSERT(obd->obd_stopping);
1254
1255         CFS_INIT_LIST_HEAD(&clean_list);
1256         spin_lock_bh(&obd->obd_processing_task_lock);
1257         if (!obd->obd_recovering) {
1258                 spin_unlock_bh(&obd->obd_processing_task_lock);
1259                 EXIT;
1260                 return;
1261         }
1262         obd->obd_recovering = obd->obd_abort_recovery = 0;
1263         target_cancel_recovery_timer(obd);
1264
1265         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1266         spin_unlock_bh(&obd->obd_processing_task_lock);
1267
1268         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1269                 LASSERT(req->rq_reply_state == 0);
1270                 target_exp_dequeue_req_replay(req);
1271                 ptlrpc_free_clone(req);
1272         }
1273
1274         spin_lock_bh(&obd->obd_processing_task_lock);
1275         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1276         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1277         spin_unlock_bh(&obd->obd_processing_task_lock);
1278
1279         list_for_each_entry_safe(req, n, &clean_list, rq_list){
1280                 LASSERT(req->rq_reply_state == 0);
1281                 ptlrpc_free_clone(req);
1282         }
1283
1284         EXIT;
1285 }
1286
1287 /* obd_processing_task_lock should be held */
1288 void target_cancel_recovery_timer(struct obd_device *obd)
1289 {
1290         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1291         cfs_timer_disarm(&obd->obd_recovery_timer);
1292 }
1293
1294 /* extend = 1 means require at least "duration" seconds left in the timer,
1295    extend = 0 means set the total duration (start_recovery_timer) */
1296 static void reset_recovery_timer(struct obd_device *obd, int duration,
1297                                  int extend)
1298 {
1299         cfs_time_t now = cfs_time_current_sec();
1300         cfs_duration_t left;
1301
1302         spin_lock_bh(&obd->obd_processing_task_lock);
1303         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1304                 spin_unlock_bh(&obd->obd_processing_task_lock);
1305                 return;
1306         }
1307
1308         left = cfs_time_sub(obd->obd_recovery_end, now);
1309
1310         if (extend && (duration > left))
1311                 obd->obd_recovery_timeout += duration - left;
1312         else if (!extend && (duration > obd->obd_recovery_timeout))
1313                 /* Track the client's largest expected replay time */
1314                 obd->obd_recovery_timeout = duration;
1315 #ifdef CRAY_XT3
1316         /*
1317          * If total recovery time already exceed the
1318          * obd_recovery_max_time, then CRAY XT3 will
1319          * abort the recovery
1320          */
1321         if(obd->obd_recovery_timeout > obd->obd_recovery_max_time)
1322                 obd->obd_recovery_timeout = obd->obd_recovery_max_time;
1323 #endif
1324         obd->obd_recovery_end = obd->obd_recovery_start +
1325                                 obd->obd_recovery_timeout;
1326         if (!cfs_timer_is_armed(&obd->obd_recovery_timer) ||
1327             cfs_time_before(now, obd->obd_recovery_end)) {
1328                 left = cfs_time_sub(obd->obd_recovery_end, now);
1329                 cfs_timer_arm(&obd->obd_recovery_timer, cfs_time_shift(left));
1330         }
1331         spin_unlock_bh(&obd->obd_processing_task_lock);
1332         CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
1333                obd->obd_name, (unsigned)left);
1334 }
1335
1336 static void check_and_start_recovery_timer(struct obd_device *obd)
1337 {
1338         spin_lock_bh(&obd->obd_processing_task_lock);
1339         if (cfs_timer_is_armed(&obd->obd_recovery_timer)) {
1340                 spin_unlock_bh(&obd->obd_processing_task_lock);
1341                 return;
1342         }
1343         CWARN("%s: starting recovery timer\n", obd->obd_name);
1344         obd->obd_recovery_start = cfs_time_current_sec();
1345         /* minimum */
1346         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1347         spin_unlock_bh(&obd->obd_processing_task_lock);
1348
1349         reset_recovery_timer(obd, obd->obd_recovery_timeout, 0);
1350 }
1351
1352 /* Reset the timer with each new client connection */
1353 /*
1354  * This timer is actually reconnect_timer, which is for making sure
1355  * the total recovery window is at least as big as my reconnect
1356  * attempt timing. So the initial recovery time_out will be set to
1357  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1358  * from client is bigger than this, then the recovery time_out will
1359  * be extend to make sure the client could be reconnected, in the
1360  * process, the timeout from the new client should be ignored.
1361  */
1362
1363 static void
1364 target_start_and_reset_recovery_timer(struct obd_device *obd,
1365                                       struct ptlrpc_request *req,
1366                                       int new_client)
1367 {
1368         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1369
1370         if (!new_client && service_time)
1371                 /* Teach server about old server's estimates, as first guess
1372                  * at how long new requests will take. */
1373                 at_add(&req->rq_rqbd->rqbd_service->srv_at_estimate,
1374                        service_time);
1375
1376         check_and_start_recovery_timer(obd);
1377
1378         /* convert the service time to rpc timeout,
1379          * reuse service_time to limit stack usage */
1380         service_time = at_est2timeout(service_time);
1381
1382         /* We expect other clients to timeout within service_time, then try
1383          * to reconnect, then try the failover server.  The max delay between
1384          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL */
1385         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC +
1386                              INITIAL_CONNECT_TIMEOUT);
1387         if (service_time > obd->obd_recovery_timeout && !new_client)
1388                 reset_recovery_timer(obd, service_time, 0);
1389 }
1390
1391 #ifdef __KERNEL__
1392 static int check_for_next_transno(struct obd_device *obd)
1393 {
1394         struct ptlrpc_request *req = NULL;
1395         int wake_up = 0, connected, completed, queue_len, max;
1396         __u64 next_transno, req_transno;
1397         ENTRY;
1398         spin_lock_bh(&obd->obd_processing_task_lock);
1399
1400         if (!list_empty(&obd->obd_req_replay_queue)) {
1401                 req = list_entry(obd->obd_req_replay_queue.next,
1402                                  struct ptlrpc_request, rq_list);
1403                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1404         } else {
1405                 req_transno = 0;
1406         }
1407
1408         max = obd->obd_max_recoverable_clients;
1409         connected = obd->obd_connected_clients;
1410         completed = connected - obd->obd_recoverable_clients;
1411         queue_len = obd->obd_requests_queued_for_recovery;
1412         next_transno = obd->obd_next_recovery_transno;
1413
1414         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1415                "req_transno: "LPU64", next_transno: "LPU64"\n",
1416                max, connected, completed, queue_len, req_transno, next_transno);
1417
1418         if (obd->obd_abort_recovery) {
1419                 CDEBUG(D_HA, "waking for aborted recovery\n");
1420                 wake_up = 1;
1421         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1422                 CDEBUG(D_HA, "waking for completed recovery\n");
1423                 wake_up = 1;
1424         } else if (req_transno == next_transno) {
1425                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1426                 wake_up = 1;
1427         } else if (queue_len + completed == max) {
1428                 /* handle gaps occured due to lost reply. It is allowed gaps
1429                  * because all clients are connected and there will be resend
1430                  * for missed transaction */
1431                 LASSERTF(req_transno >= next_transno,
1432                          "req_transno: "LPU64", next_transno: "LPU64"\n",
1433                          req_transno, next_transno);
1434
1435                 CDEBUG(req_transno > obd->obd_last_committed ? D_ERROR : D_HA,
1436                        "waking for skipped transno (skip: "LPD64
1437                        ", ql: %d, comp: %d, conn: %d, next: "LPD64")\n",
1438                        next_transno, queue_len, completed, connected, req_transno);
1439                 obd->obd_next_recovery_transno = req_transno;
1440                 wake_up = 1;
1441         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1442                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1443                        " by fail_lock, waking up ("LPD64")\n", next_transno);
1444                 obd->obd_next_recovery_transno = req_transno;
1445                 wake_up = 1;
1446         } else if (queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1447                 /* some clients haven't connected in time, but we can try
1448                  * to replay requests that demand on already committed ones
1449                  * also, we can replay first non-committed transation */
1450                 LASSERT(req_transno != 0);
1451                 if (req_transno == obd->obd_last_committed + 1) {
1452                         obd->obd_next_recovery_transno = req_transno;
1453                 } else if (req_transno > obd->obd_last_committed) {
1454                         /* can't continue recovery: have no needed transno */
1455                         obd->obd_abort_recovery = 1;
1456                         CDEBUG(D_ERROR, "abort due to missed clients. max: %d, "
1457                                "connected: %d, completed: %d, queue_len: %d, "
1458                                "req_transno: "LPU64", next_transno: "LPU64"\n",
1459                                max, connected, completed, queue_len,
1460                                req_transno, next_transno);
1461                 }
1462                 wake_up = 1;
1463         }
1464
1465         spin_unlock_bh(&obd->obd_processing_task_lock);
1466         return wake_up;
1467 }
1468
1469 static struct ptlrpc_request *target_next_replay_req(struct obd_device *obd)
1470 {
1471         struct l_wait_info lwi = { 0 };
1472         struct ptlrpc_request *req;
1473
1474         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1475                obd->obd_next_recovery_transno);
1476         l_wait_event(obd->obd_next_transno_waitq,
1477                      check_for_next_transno(obd), &lwi);
1478
1479         spin_lock_bh(&obd->obd_processing_task_lock);
1480         if (obd->obd_abort_recovery) {
1481                 req = NULL;
1482         } else if (!list_empty(&obd->obd_req_replay_queue)) {
1483                 req = list_entry(obd->obd_req_replay_queue.next,
1484                                  struct ptlrpc_request, rq_list);
1485                 target_exp_dequeue_req_replay(req);
1486                 list_del_init(&req->rq_list);
1487                 obd->obd_requests_queued_for_recovery--;
1488         } else {
1489                 req = NULL;
1490         }
1491         spin_unlock_bh(&obd->obd_processing_task_lock);
1492         RETURN(req);
1493 }
1494
1495 static int check_for_next_lock(struct obd_device *obd)
1496 {
1497         struct ptlrpc_request *req = NULL;
1498         int wake_up = 0;
1499
1500         spin_lock_bh(&obd->obd_processing_task_lock);
1501         if (!list_empty(&obd->obd_lock_replay_queue)) {
1502                 req = list_entry(obd->obd_lock_replay_queue.next,
1503                                  struct ptlrpc_request, rq_list);
1504                 CDEBUG(D_HA, "waking for next lock\n");
1505                 wake_up = 1;
1506         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1507                 CDEBUG(D_HA, "waking for completed lock replay\n");
1508                 wake_up = 1;
1509         } else if (obd->obd_abort_recovery) {
1510                 CDEBUG(D_HA, "waking for aborted recovery\n");
1511                 wake_up = 1;
1512         }
1513         spin_unlock_bh(&obd->obd_processing_task_lock);
1514
1515         return wake_up;
1516 }
1517
1518 static struct ptlrpc_request *target_next_replay_lock(struct obd_device *obd)
1519 {
1520         struct l_wait_info lwi = { 0 };
1521         struct ptlrpc_request *req;
1522
1523         CDEBUG(D_HA, "Waiting for lock\n");
1524         l_wait_event(obd->obd_next_transno_waitq,
1525                      check_for_next_lock(obd), &lwi);
1526
1527         spin_lock_bh(&obd->obd_processing_task_lock);
1528         if (obd->obd_abort_recovery) {
1529                 req = NULL;
1530         } else if (!list_empty(&obd->obd_lock_replay_queue)) {
1531                 req = list_entry(obd->obd_lock_replay_queue.next,
1532                                  struct ptlrpc_request, rq_list);
1533                 list_del_init(&req->rq_list);
1534         } else {
1535                 req = NULL;
1536         }
1537         spin_unlock_bh(&obd->obd_processing_task_lock);
1538         return req;
1539 }
1540
1541 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
1542 {
1543         struct ptlrpc_request *req;
1544
1545         spin_lock_bh(&obd->obd_processing_task_lock);
1546         if (!list_empty(&obd->obd_final_req_queue)) {
1547                 req = list_entry(obd->obd_final_req_queue.next,
1548                                  struct ptlrpc_request, rq_list);
1549                 list_del_init(&req->rq_list);
1550         } else {
1551                 req = NULL;
1552         }
1553         spin_unlock_bh(&obd->obd_processing_task_lock);
1554         return req;
1555 }
1556
1557 static inline int req_replay_done(struct obd_export *exp)
1558 {
1559         return (exp->exp_req_replay_needed == 0);
1560 }
1561
1562 static inline int lock_replay_done(struct obd_export *exp)
1563 {
1564         return (exp->exp_lock_replay_needed == 0);
1565 }
1566
1567 static inline int connect_done(struct obd_export *exp)
1568 {
1569         return (exp->exp_in_recovery != 0);
1570 }
1571
1572 static int check_for_clients(struct obd_device *obd)
1573 {
1574         if (obd->obd_abort_recovery)
1575                 return 1;
1576         LASSERT(obd->obd_connected_clients <= obd->obd_max_recoverable_clients);
1577         if (obd->obd_no_conn == 0 &&
1578             obd->obd_connected_clients == obd->obd_max_recoverable_clients)
1579                 return 1;
1580         return 0;
1581 }
1582
1583 static int handle_recovery_req(struct ptlrpc_thread *thread,
1584                                struct ptlrpc_request *req,
1585                                svc_handler_t handler)
1586 {
1587         int rc;
1588         ENTRY;
1589
1590         rc = lu_context_init(&req->rq_session, LCT_SESSION);
1591         if (rc) {
1592                 CERROR("Failure to initialize session: %d\n", rc);
1593                 return rc;
1594         }
1595         req->rq_session.lc_thread = thread;
1596         lu_context_enter(&req->rq_session);
1597         req->rq_svc_thread = thread;
1598         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
1599
1600         /* thread context */
1601         lu_context_enter(&thread->t_env->le_ctx);
1602         (void)handler(req);
1603         lu_context_exit(&thread->t_env->le_ctx);
1604
1605         lu_context_exit(&req->rq_session);
1606         lu_context_fini(&req->rq_session);
1607         /* don't reset timer for final stage */
1608         if (!req_replay_done(req->rq_export) ||
1609             !lock_replay_done(req->rq_export))
1610                 reset_recovery_timer(class_exp2obd(req->rq_export),
1611                        AT_OFF ? obd_timeout :
1612                        at_get(&req->rq_rqbd->rqbd_service->srv_at_estimate), 1);
1613         ptlrpc_free_clone(req);
1614         RETURN(0);
1615 }
1616
1617 static void resume_recovery_timer(struct obd_device *obd)
1618 {
1619         /* to be safe, make it at least OBD_RECOVERY_FACTOR * obd_timeout */
1620         reset_recovery_timer(obd, OBD_RECOVERY_FACTOR * obd_timeout, 1);
1621 }
1622
1623 static int target_recovery_thread(void *arg)
1624 {
1625         struct obd_device *obd = arg;
1626         struct ptlrpc_request *req;
1627         struct target_recovery_data *trd = &obd->obd_recovery_data;
1628         struct l_wait_info lwi = { 0 };
1629         unsigned long delta;
1630         unsigned long flags;
1631         struct lu_env env;
1632         struct ptlrpc_thread fake_svc_thread, *thread = &fake_svc_thread;
1633         int rc = 0;
1634         ENTRY;
1635
1636         cfs_daemonize("tgt_recov");
1637
1638         SIGNAL_MASK_LOCK(current, flags);
1639         sigfillset(&current->blocked);
1640         RECALC_SIGPENDING;
1641         SIGNAL_MASK_UNLOCK(current, flags);
1642
1643         rc = lu_context_init(&env.le_ctx, LCT_MD_THREAD);
1644         if (rc)
1645                 RETURN(rc);
1646
1647         thread->t_env = &env;
1648         env.le_ctx.lc_thread = thread;
1649
1650         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
1651                current->pid);
1652         trd->trd_processing_task = current->pid;
1653
1654         obd->obd_recovering = 1;
1655         complete(&trd->trd_starting);
1656
1657         /* first of all, we have to know the first transno to replay */
1658         obd->obd_abort_recovery = 0;
1659         l_wait_event(obd->obd_next_transno_waitq,
1660                      check_for_clients(obd), &lwi);
1661
1662         spin_lock_bh(&obd->obd_processing_task_lock);
1663         target_cancel_recovery_timer(obd);
1664         spin_unlock_bh(&obd->obd_processing_task_lock);
1665
1666         /* If some clients haven't connected in time, evict them */
1667         if (obd->obd_abort_recovery) {
1668                 CWARN("Some clients haven't connect in time (%d/%d),"
1669                        "evict them\n", obd->obd_connected_clients,
1670                        obd->obd_max_recoverable_clients);
1671                 obd->obd_abort_recovery = obd->obd_stopping;
1672                 class_disconnect_stale_exports(obd, connect_done,
1673                                                exp_flags_from_obd(obd) |
1674                                                OBD_OPT_ABORT_RECOV);
1675         }
1676         /* next stage: replay requests */
1677         delta = jiffies;
1678         obd->obd_req_replaying = 1;
1679         CDEBUG(D_INFO, "1: request replay stage - %d clients from t"LPU64"\n",
1680               atomic_read(&obd->obd_req_replay_clients),
1681               obd->obd_next_recovery_transno);
1682         resume_recovery_timer(obd);
1683         while ((req = target_next_replay_req(obd))) {
1684                 LASSERT(trd->trd_processing_task == current->pid);
1685                 DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s",
1686                           lustre_msg_get_transno(req->rq_reqmsg),
1687                           libcfs_nid2str(req->rq_peer.nid));
1688                 handle_recovery_req(thread, req,
1689                                     trd->trd_recovery_handler);
1690                 obd->obd_replayed_requests++;
1691                 spin_lock_bh(&obd->obd_processing_task_lock);
1692                 obd->obd_next_recovery_transno++;
1693                 spin_unlock_bh(&obd->obd_processing_task_lock);
1694         }
1695
1696         spin_lock_bh(&obd->obd_processing_task_lock);
1697         target_cancel_recovery_timer(obd);
1698         spin_unlock_bh(&obd->obd_processing_task_lock);
1699
1700         /* If some clients haven't replayed requests in time, evict them */
1701         if (obd->obd_abort_recovery) {
1702                 CDEBUG(D_ERROR, "req replay timed out, aborting ...\n");
1703                 obd->obd_abort_recovery = obd->obd_stopping;
1704                 class_disconnect_stale_exports(obd, req_replay_done,
1705                                                exp_flags_from_obd(obd) |
1706                                                OBD_OPT_ABORT_RECOV);
1707                 abort_req_replay_queue(obd);
1708         }
1709
1710         /* The second stage: replay locks */
1711         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
1712                atomic_read(&obd->obd_lock_replay_clients));
1713         resume_recovery_timer(obd);
1714         while ((req = target_next_replay_lock(obd))) {
1715                 LASSERT(trd->trd_processing_task == current->pid);
1716                 DEBUG_REQ(D_HA|D_WARNING, req, "processing lock from %s: ",
1717                           libcfs_nid2str(req->rq_peer.nid));
1718                 handle_recovery_req(thread, req,
1719                                     trd->trd_recovery_handler);
1720                 obd->obd_replayed_locks++;
1721         }
1722
1723         spin_lock_bh(&obd->obd_processing_task_lock);
1724         target_cancel_recovery_timer(obd);
1725         spin_unlock_bh(&obd->obd_processing_task_lock);
1726         /* If some clients haven't replayed requests in time, evict them */
1727         if (obd->obd_abort_recovery) {
1728                 int stale;
1729                 CERROR("lock replay timed out, aborting ...\n");
1730                 obd->obd_abort_recovery = obd->obd_stopping;
1731                 stale = class_disconnect_stale_exports(obd, lock_replay_done,
1732                                                        exp_flags_from_obd(obd) |
1733                                                        OBD_OPT_ABORT_RECOV);
1734                 abort_lock_replay_queue(obd);
1735         }
1736
1737         /* We drop recoverying flag to forward all new requests
1738          * to regular mds_handle() since now */
1739         spin_lock_bh(&obd->obd_processing_task_lock);
1740         obd->obd_recovering = obd->obd_abort_recovery = 0;
1741         spin_unlock_bh(&obd->obd_processing_task_lock);
1742         /* The third stage: reply on final pings */
1743         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
1744         while ((req = target_next_final_ping(obd))) {
1745                 LASSERT(trd->trd_processing_task == current->pid);
1746                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
1747                           libcfs_nid2str(req->rq_peer.nid));
1748                 handle_recovery_req(thread, req,
1749                                     trd->trd_recovery_handler);
1750         }
1751
1752         delta = (jiffies - delta) / HZ;
1753         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
1754               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
1755         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
1756         LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
1757         if (delta > obd_timeout * 2) {
1758                 CWARN("too long recovery - read logs\n");
1759                 libcfs_debug_dumplog();
1760         }
1761
1762         target_finish_recovery(obd);
1763
1764         lu_context_fini(&env.le_ctx);
1765         trd->trd_processing_task = 0;
1766         complete(&trd->trd_finishing);
1767         RETURN(rc);
1768 }
1769
1770 int target_start_recovery_thread(struct obd_device *obd, svc_handler_t handler)
1771 {
1772         int rc = 0;
1773         struct target_recovery_data *trd = &obd->obd_recovery_data;
1774
1775         memset(trd, 0, sizeof(*trd));
1776         init_completion(&trd->trd_starting);
1777         init_completion(&trd->trd_finishing);
1778         trd->trd_recovery_handler = handler;
1779
1780         if (kernel_thread(target_recovery_thread, obd, 0) > 0) {
1781                 wait_for_completion(&trd->trd_starting);
1782                 LASSERT(obd->obd_recovering != 0);
1783         } else
1784                 rc = -ECHILD;
1785
1786         return rc;
1787 }
1788
1789 void target_stop_recovery_thread(struct obd_device *obd)
1790 {
1791         spin_lock_bh(&obd->obd_processing_task_lock);
1792         if (obd->obd_recovery_data.trd_processing_task > 0) {
1793                 struct target_recovery_data *trd = &obd->obd_recovery_data;
1794                 CERROR("%s: Aborting recovery\n", obd->obd_name);
1795                 obd->obd_abort_recovery = 1;
1796                 wake_up(&obd->obd_next_transno_waitq);
1797                 spin_unlock_bh(&obd->obd_processing_task_lock);
1798                 wait_for_completion(&trd->trd_finishing);
1799         } else {
1800                 spin_unlock_bh(&obd->obd_processing_task_lock);
1801         }
1802 }
1803
1804 void target_recovery_fini(struct obd_device *obd)
1805 {
1806         class_disconnect_exports(obd);
1807         target_stop_recovery_thread(obd);
1808         target_cleanup_recovery(obd);
1809 }
1810 EXPORT_SYMBOL(target_recovery_fini);
1811
1812 static void target_recovery_expired(unsigned long castmeharder)
1813 {
1814         struct obd_device *obd = (struct obd_device *)castmeharder;
1815         LCONSOLE_WARN("%s: recovery timed out; %d clients never reconnected "
1816                       "after %lds (%d clients did)\n",
1817                       obd->obd_name, obd->obd_recoverable_clients,
1818                       cfs_time_current_sec()- obd->obd_recovery_start,
1819                       obd->obd_connected_clients);
1820         spin_lock_bh(&obd->obd_processing_task_lock);
1821         if (obd->obd_recovering)
1822                 obd->obd_abort_recovery = 1;
1823         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1824         spin_unlock_bh(&obd->obd_processing_task_lock);
1825 }
1826
1827 void target_recovery_init(struct obd_device *obd, svc_handler_t handler)
1828 {
1829         if (obd->obd_max_recoverable_clients == 0)
1830                 return;
1831
1832         CWARN("RECOVERY: service %s, %d recoverable clients, "
1833               "last_transno "LPU64"\n", obd->obd_name,
1834               obd->obd_max_recoverable_clients, obd->obd_last_committed);
1835         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
1836         obd->obd_recovery_start = 0;
1837         obd->obd_recovery_end = 0;
1838         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1839         /* bz13079: this should be set to desired value for ost but not for mds */
1840         obd->obd_recovery_max_time = OBD_RECOVERY_MAX_TIME;
1841         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
1842         target_start_recovery_thread(obd, handler);
1843 }
1844 EXPORT_SYMBOL(target_recovery_init);
1845
1846 #endif
1847
1848 int target_process_req_flags(struct obd_device *obd, struct ptlrpc_request *req)
1849 {
1850         struct obd_export *exp = req->rq_export;
1851         LASSERT(exp != NULL);
1852         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1853                 /* client declares he's ready to replay locks */
1854                 spin_lock_bh(&obd->obd_processing_task_lock);
1855                 if (exp->exp_req_replay_needed) {
1856                         LASSERT(atomic_read(&obd->obd_req_replay_clients) > 0);
1857                         spin_lock(&exp->exp_lock);
1858                         exp->exp_req_replay_needed = 0;
1859                         spin_unlock(&exp->exp_lock);
1860                         atomic_dec(&obd->obd_req_replay_clients);
1861                         LASSERT(obd->obd_recoverable_clients > 0);
1862                         obd->obd_recoverable_clients--;
1863                         if (atomic_read(&obd->obd_req_replay_clients) == 0)
1864                                 CDEBUG(D_HA, "all clients have replayed reqs\n");
1865                         wake_up(&obd->obd_next_transno_waitq);
1866                 }
1867                 spin_unlock_bh(&obd->obd_processing_task_lock);
1868         }
1869         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1870                 /* client declares he's ready to complete recovery
1871                  * so, we put the request on th final queue */
1872                 spin_lock_bh(&obd->obd_processing_task_lock);
1873                 if (exp->exp_lock_replay_needed) {
1874                         LASSERT(atomic_read(&obd->obd_lock_replay_clients) > 0);
1875                         spin_lock(&exp->exp_lock);
1876                         exp->exp_lock_replay_needed = 0;
1877                         spin_unlock(&exp->exp_lock);
1878                         atomic_dec(&obd->obd_lock_replay_clients);
1879                         if (atomic_read(&obd->obd_lock_replay_clients) == 0)
1880                                 CDEBUG(D_HA, "all clients have replayed locks\n");
1881                         wake_up(&obd->obd_next_transno_waitq);
1882                 }
1883                 spin_unlock_bh(&obd->obd_processing_task_lock);
1884         }
1885
1886         return 0;
1887 }
1888
1889 int target_queue_recovery_request(struct ptlrpc_request *req,
1890                                   struct obd_device *obd)
1891 {
1892         struct list_head *tmp;
1893         int inserted = 0;
1894         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1895
1896         ENTRY;
1897
1898         if (obd->obd_recovery_data.trd_processing_task == cfs_curproc_pid()) {
1899                 /* Processing the queue right now, don't re-add. */
1900                 RETURN(1);
1901         }
1902
1903         target_process_req_flags(obd, req);
1904
1905         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1906                 /* client declares he's ready to complete recovery
1907                  * so, we put the request on th final queue */
1908                 req = ptlrpc_clone_req(req);
1909                 if (req == NULL)
1910                         RETURN(-ENOMEM);
1911                 DEBUG_REQ(D_HA, req, "queue final req");
1912                 spin_lock_bh(&obd->obd_processing_task_lock);
1913                 if (obd->obd_recovering)
1914                         list_add_tail(&req->rq_list, &obd->obd_final_req_queue);
1915                 else {
1916                         spin_unlock_bh(&obd->obd_processing_task_lock);
1917                         ptlrpc_free_clone(req);
1918                         if (obd->obd_stopping) {
1919                                 RETURN(-ENOTCONN);
1920                         } else {
1921                                 RETURN(1);
1922                         }
1923                 }
1924                 spin_unlock_bh(&obd->obd_processing_task_lock);
1925                 RETURN(0);
1926         }
1927         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1928                 /* client declares he's ready to replay locks */
1929                 req = ptlrpc_clone_req(req);
1930                 if (req == NULL)
1931                         RETURN(-ENOMEM);
1932                 DEBUG_REQ(D_HA, req, "queue lock replay req");
1933                 spin_lock_bh(&obd->obd_processing_task_lock);
1934                 LASSERT(obd->obd_recovering);
1935                 /* usually due to recovery abort */
1936                 if (!req->rq_export->exp_in_recovery) {
1937                         spin_unlock_bh(&obd->obd_processing_task_lock);
1938                         ptlrpc_free_clone(req);
1939                         RETURN(-ENOTCONN);
1940                 }
1941                 LASSERT(req->rq_export->exp_lock_replay_needed);
1942                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
1943                 spin_unlock_bh(&obd->obd_processing_task_lock);
1944                 wake_up(&obd->obd_next_transno_waitq);
1945                 RETURN(0);
1946         }
1947
1948         /* CAVEAT EMPTOR: The incoming request message has been swabbed
1949          * (i.e. buflens etc are in my own byte order), but type-dependent
1950          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
1951
1952         if (!transno) {
1953                 CFS_INIT_LIST_HEAD(&req->rq_list);
1954                 DEBUG_REQ(D_HA, req, "not queueing");
1955                 RETURN(1);
1956         }
1957
1958         spin_lock_bh(&obd->obd_processing_task_lock);
1959
1960         /* If we're processing the queue, we want don't want to queue this
1961          * message.
1962          *
1963          * Also, if this request has a transno less than the one we're waiting
1964          * for, we should process it now.  It could (and currently always will)
1965          * be an open request for a descriptor that was opened some time ago.
1966          *
1967          * Also, a resent, replayed request that has already been
1968          * handled will pass through here and be processed immediately.
1969          */
1970         CWARN("Next recovery transno: "LPU64", current: "LPU64", replaying: %i\n",
1971               obd->obd_next_recovery_transno, transno, obd->obd_req_replaying);
1972         if (transno < obd->obd_next_recovery_transno && obd->obd_req_replaying) {
1973                 /* Processing the queue right now, don't re-add. */
1974                 LASSERT(list_empty(&req->rq_list));
1975                 spin_unlock_bh(&obd->obd_processing_task_lock);
1976                 RETURN(1);
1977         }
1978         spin_unlock_bh(&obd->obd_processing_task_lock);
1979
1980         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
1981                 RETURN(0);
1982
1983         req = ptlrpc_clone_req(req);
1984         if (req == NULL)
1985                 RETURN(-ENOMEM);
1986
1987         spin_lock_bh(&obd->obd_processing_task_lock);
1988         LASSERT(obd->obd_recovering);
1989         if (!req->rq_export->exp_in_recovery) {
1990                 spin_unlock_bh(&obd->obd_processing_task_lock);
1991                 ptlrpc_free_clone(req);
1992                 RETURN(-ENOTCONN);
1993         }
1994         LASSERT(req->rq_export->exp_req_replay_needed);
1995
1996         if (target_exp_enqueue_req_replay(req)) {
1997                 spin_unlock_bh(&obd->obd_processing_task_lock);
1998                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
1999                 ptlrpc_free_clone(req);
2000                 RETURN(0);
2001         }
2002
2003         /* XXX O(n^2) */
2004         list_for_each(tmp, &obd->obd_req_replay_queue) {
2005                 struct ptlrpc_request *reqiter =
2006                         list_entry(tmp, struct ptlrpc_request, rq_list);
2007
2008                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2009                         list_add_tail(&req->rq_list, &reqiter->rq_list);
2010                         inserted = 1;
2011                         break;
2012                 }
2013
2014                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2015                              transno)) {
2016                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2017                                   "has been claimed by another client");
2018                         spin_unlock_bh(&obd->obd_processing_task_lock);
2019                         target_exp_dequeue_req_replay(req);
2020                         ptlrpc_free_clone(req);
2021                         RETURN(0);
2022                 }
2023         }
2024
2025         if (!inserted)
2026                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2027
2028         obd->obd_requests_queued_for_recovery++;
2029         wake_up(&obd->obd_next_transno_waitq);
2030         spin_unlock_bh(&obd->obd_processing_task_lock);
2031         RETURN(0);
2032 }
2033
2034 struct obd_device * target_req2obd(struct ptlrpc_request *req)
2035 {
2036         return req->rq_export->exp_obd;
2037 }
2038
2039 static inline struct ldlm_pool *ldlm_exp2pl(struct obd_export *exp)
2040 {
2041         LASSERT(exp != NULL);
2042         return &exp->exp_obd->obd_namespace->ns_pool;
2043 }
2044
2045 /**
2046  * Packs current SLV and Limit into \a req.
2047  */
2048 int target_pack_pool_reply(struct ptlrpc_request *req)
2049 {
2050         struct obd_device *obd;
2051         ENTRY;
2052
2053         /*
2054          * Check that we still have all structures alive as this may
2055          * be some late rpc in shutdown time.
2056          */
2057         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2058                      !exp_connect_lru_resize(req->rq_export))) {
2059                 lustre_msg_set_slv(req->rq_repmsg, 0);
2060                 lustre_msg_set_limit(req->rq_repmsg, 0);
2061                 RETURN(0);
2062         }
2063
2064         /*
2065          * OBD is alive here as export is alive, which we checked above.
2066          */
2067         obd = req->rq_export->exp_obd;
2068
2069         read_lock(&obd->obd_pool_lock);
2070         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2071         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2072         read_unlock(&obd->obd_pool_lock);
2073
2074         RETURN(0);
2075 }
2076
2077 int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
2078 {
2079         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2080                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2081                 return (-ECOMM);
2082         }
2083
2084         if (unlikely(rc)) {
2085                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
2086                 req->rq_status = rc;
2087                 return (ptlrpc_send_error(req, 1));
2088         } else {
2089                 DEBUG_REQ(D_NET, req, "sending reply");
2090         }
2091
2092         return (ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT));
2093 }
2094
2095 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2096 {
2097         int                        netrc;
2098         struct ptlrpc_reply_state *rs;
2099         struct obd_device         *obd;
2100         struct obd_export         *exp;
2101         struct ptlrpc_service     *svc;
2102         ENTRY;
2103
2104         if (req->rq_no_reply) {
2105                 EXIT;
2106                 return;
2107         }
2108
2109         svc = req->rq_rqbd->rqbd_service;
2110         rs = req->rq_reply_state;
2111         if (rs == NULL || !rs->rs_difficult) {
2112                 /* no notifiers */
2113                 target_send_reply_msg (req, rc, fail_id);
2114                 EXIT;
2115                 return;
2116         }
2117
2118         /* must be an export if locks saved */
2119         LASSERT (req->rq_export != NULL);
2120         /* req/reply consistent */
2121         LASSERT (rs->rs_service == svc);
2122
2123         /* "fresh" reply */
2124         LASSERT (!rs->rs_scheduled);
2125         LASSERT (!rs->rs_scheduled_ever);
2126         LASSERT (!rs->rs_handled);
2127         LASSERT (!rs->rs_on_net);
2128         LASSERT (rs->rs_export == NULL);
2129         LASSERT (list_empty(&rs->rs_obd_list));
2130         LASSERT (list_empty(&rs->rs_exp_list));
2131
2132         exp = class_export_get (req->rq_export);
2133         obd = exp->exp_obd;
2134
2135         /* disable reply scheduling onto srv_reply_queue while I'm setting up */
2136         rs->rs_scheduled = 1;
2137         rs->rs_on_net    = 1;
2138         rs->rs_xid       = req->rq_xid;
2139         rs->rs_transno   = req->rq_transno;
2140         rs->rs_export    = exp;
2141
2142         spin_lock(&obd->obd_uncommitted_replies_lock);
2143
2144         CDEBUG(D_NET, "rs transno = "LPU64", last committed = "LPU64"\n",
2145                rs->rs_transno, obd->obd_last_committed);
2146         if (rs->rs_transno > obd->obd_last_committed) {
2147                 /* not committed already */
2148                 list_add_tail (&rs->rs_obd_list,
2149                                &obd->obd_uncommitted_replies);
2150         }
2151
2152         spin_unlock (&obd->obd_uncommitted_replies_lock);
2153         spin_lock (&exp->exp_lock);
2154
2155         list_add_tail (&rs->rs_exp_list, &exp->exp_outstanding_replies);
2156
2157         spin_unlock(&exp->exp_lock);
2158
2159         netrc = target_send_reply_msg (req, rc, fail_id);
2160
2161         spin_lock(&svc->srv_lock);
2162
2163         atomic_inc(&svc->srv_n_difficult_replies);
2164
2165         if (netrc != 0) {
2166                 /* error sending: reply is off the net.  Also we need +1
2167                  * reply ref until ptlrpc_server_handle_reply() is done
2168                  * with the reply state (if the send was successful, there
2169                  * would have been +1 ref for the net, which
2170                  * reply_out_callback leaves alone) */
2171                 rs->rs_on_net = 0;
2172                 ptlrpc_rs_addref(rs);
2173                 atomic_inc (&svc->srv_outstanding_replies);
2174         }
2175
2176         spin_lock(&rs->rs_lock);
2177         if (rs->rs_transno <= obd->obd_last_committed ||
2178             (!rs->rs_on_net && !rs->rs_no_ack) ||
2179              list_empty(&rs->rs_exp_list) ||     /* completed already */
2180              list_empty(&rs->rs_obd_list)) {
2181                 CDEBUG(D_HA, "Schedule reply immediately\n");
2182                 ptlrpc_dispatch_difficult_reply(rs);
2183         } else {
2184                 list_add (&rs->rs_list, &svc->srv_active_replies);
2185                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
2186         }
2187         spin_unlock(&rs->rs_lock);
2188         spin_unlock(&svc->srv_lock);
2189         EXIT;
2190 }
2191
2192 int target_handle_ping(struct ptlrpc_request *req)
2193 {
2194         obd_ping(req->rq_export);
2195         return req_capsule_server_pack(&req->rq_pill);
2196 }
2197
2198 void target_committed_to_req(struct ptlrpc_request *req)
2199 {
2200         struct obd_device *obd;
2201
2202         if (req == NULL || req->rq_export == NULL)
2203                 return;
2204
2205         obd = req->rq_export->exp_obd;
2206         if (obd == NULL)
2207                 return;
2208
2209         if (!obd->obd_no_transno && req->rq_repmsg != NULL)
2210                 lustre_msg_set_last_committed(req->rq_repmsg,
2211                                               obd->obd_last_committed);
2212         else
2213                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2214                           "%d)", obd->obd_no_transno, req->rq_repmsg == NULL);
2215
2216         CDEBUG(D_INFO, "last_committed "LPU64", transno "LPU64", xid "LPU64"\n",
2217                obd->obd_last_committed, req->rq_transno, req->rq_xid);
2218 }
2219
2220 EXPORT_SYMBOL(target_committed_to_req);
2221
2222 int target_handle_qc_callback(struct ptlrpc_request *req)
2223 {
2224         struct obd_quotactl *oqctl;
2225         struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
2226
2227         oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2228         if (oqctl == NULL) {
2229                 CERROR("Can't unpack obd_quotactl\n");
2230                 RETURN(-EPROTO);
2231         }
2232
2233         cli->cl_qchk_stat = oqctl->qc_stat;
2234
2235         return 0;
2236 }
2237
2238 #ifdef HAVE_QUOTA_SUPPORT
2239 int target_handle_dqacq_callback(struct ptlrpc_request *req)
2240 {
2241 #ifdef __KERNEL__
2242         struct obd_device *obd = req->rq_export->exp_obd;
2243         struct obd_device *master_obd;
2244         struct obd_device_target *obt;
2245         struct lustre_quota_ctxt *qctxt;
2246         struct qunit_data *qdata = NULL;
2247         int rc = 0;
2248         ENTRY;
2249
2250         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_DROP_QUOTA_REQ))
2251                 RETURN(rc);
2252
2253         rc = req_capsule_server_pack(&req->rq_pill);
2254         if (rc) {
2255                 CERROR("packing reply failed!: rc = %d\n", rc);
2256                 RETURN(rc);
2257         }
2258
2259         LASSERT(req->rq_export);
2260
2261         OBD_ALLOC(qdata, sizeof(struct qunit_data));
2262         if (!qdata)
2263                 RETURN(-ENOMEM);
2264         rc = quota_get_qdata(req, qdata, QUOTA_REQUEST, QUOTA_EXPORT);
2265         if (rc < 0) {
2266                 CDEBUG(D_ERROR, "Can't unpack qunit_data(rc: %d)\n", rc);
2267                 GOTO(out, rc);
2268         }
2269
2270         /* we use the observer */
2271         if (!obd->obd_observer || !obd->obd_observer->obd_observer) {
2272                 CERROR("Can't find the observer, it is recovering\n");
2273                 req->rq_status = -EAGAIN;
2274                 GOTO(send_reply, rc = -EAGAIN);
2275         }
2276
2277         master_obd = obd->obd_observer->obd_observer;
2278         obt = &master_obd->u.obt;
2279         qctxt = &obt->obt_qctxt;
2280
2281         if (!qctxt->lqc_setup || !qctxt->lqc_valid) {
2282                 /* quota_type has not been processed yet, return EAGAIN
2283                  * until we know whether or not quotas are supposed to
2284                  * be enabled */
2285                 CDEBUG(D_QUOTA, "quota_type not processed yet, return "
2286                        "-EAGAIN\n");
2287                 req->rq_status = -EAGAIN;
2288                 rc = ptlrpc_reply(req);
2289                 GOTO(out, rc);
2290         }
2291
2292         down_read(&obt->obt_rwsem);
2293         if (qctxt->lqc_lqs_hash == NULL) {
2294                 up_read(&obt->obt_rwsem);
2295                 /* quota_type has not been processed yet, return EAGAIN
2296                  * until we know whether or not quotas are supposed to
2297                  * be enabled */
2298                 CDEBUG(D_QUOTA, "quota_ctxt is not ready yet, return "
2299                        "-EAGAIN\n");
2300                 req->rq_status = -EAGAIN;
2301                 rc = ptlrpc_reply(req);
2302                 GOTO(out, rc);
2303         }
2304
2305         LASSERT(qctxt->lqc_handler);
2306         rc = qctxt->lqc_handler(master_obd, qdata,
2307                                 lustre_msg_get_opc(req->rq_reqmsg));
2308         up_read(&obt->obt_rwsem);
2309         if (rc && rc != -EDQUOT)
2310                 CDEBUG(rc == -EBUSY  ? D_QUOTA : D_ERROR,
2311                        "dqacq failed! (rc:%d)\n", rc);
2312         req->rq_status = rc;
2313
2314         /* there are three forms of qunit(historic causes), so we need to
2315          * adjust the same form to different forms slaves needed */
2316         rc = quota_copy_qdata(req, qdata, QUOTA_REPLY, QUOTA_EXPORT);
2317         if (rc < 0) {
2318                 CDEBUG(D_ERROR, "Can't pack qunit_data(rc: %d)\n", rc);
2319                 GOTO(out, rc);
2320         }
2321
2322         /* Block the quota req. b=14840 */
2323         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_BLOCK_QUOTA_REQ, obd_timeout);
2324 send_reply:
2325         rc = ptlrpc_reply(req);
2326 out:
2327         OBD_FREE(qdata, sizeof(struct qunit_data));
2328         RETURN(rc);
2329 #else
2330         return 0;
2331 #endif /* !__KERNEL__ */
2332 }
2333 #endif /* HAVE_QUOTA_SUPPORT */
2334
2335 ldlm_mode_t lck_compat_array[] = {
2336         [LCK_EX] LCK_COMPAT_EX,
2337         [LCK_PW] LCK_COMPAT_PW,
2338         [LCK_PR] LCK_COMPAT_PR,
2339         [LCK_CW] LCK_COMPAT_CW,
2340         [LCK_CR] LCK_COMPAT_CR,
2341         [LCK_NL] LCK_COMPAT_NL,
2342         [LCK_GROUP] LCK_COMPAT_GROUP,
2343         [LCK_COS] LCK_COMPAT_COS,
2344 };
2345
2346 /**
2347  * Rather arbitrary mapping from LDLM error codes to errno values. This should
2348  * not escape to the user level.
2349  */
2350 int ldlm_error2errno(ldlm_error_t error)
2351 {
2352         int result;
2353
2354         switch (error) {
2355         case ELDLM_OK:
2356                 result = 0;
2357                 break;
2358         case ELDLM_LOCK_CHANGED:
2359                 result = -ESTALE;
2360                 break;
2361         case ELDLM_LOCK_ABORTED:
2362                 result = -ENAVAIL;
2363                 break;
2364         case ELDLM_LOCK_REPLACED:
2365                 result = -ESRCH;
2366                 break;
2367         case ELDLM_NO_LOCK_DATA:
2368                 result = -ENOENT;
2369                 break;
2370         case ELDLM_NAMESPACE_EXISTS:
2371                 result = -EEXIST;
2372                 break;
2373         case ELDLM_BAD_NAMESPACE:
2374                 result = -EBADF;
2375                 break;
2376         default:
2377                 if (((int)error) < 0)  /* cast to signed type */
2378                         result = error; /* as ldlm_error_t can be unsigned */
2379                 else {
2380                         CERROR("Invalid DLM result code: %i\n", error);
2381                         result = -EPROTO;
2382                 }
2383         }
2384         return result;
2385 }
2386 EXPORT_SYMBOL(ldlm_error2errno);
2387
2388 /**
2389  * Dual to ldlm_error2errno(): maps errno values back to ldlm_error_t.
2390  */
2391 ldlm_error_t ldlm_errno2error(int err_no)
2392 {
2393         int error;
2394
2395         switch (err_no) {
2396         case 0:
2397                 error = ELDLM_OK;
2398                 break;
2399         case -ESTALE:
2400                 error = ELDLM_LOCK_CHANGED;
2401                 break;
2402         case -ENAVAIL:
2403                 error = ELDLM_LOCK_ABORTED;
2404                 break;
2405         case -ESRCH:
2406                 error = ELDLM_LOCK_REPLACED;
2407                 break;
2408         case -ENOENT:
2409                 error = ELDLM_NO_LOCK_DATA;
2410                 break;
2411         case -EEXIST:
2412                 error = ELDLM_NAMESPACE_EXISTS;
2413                 break;
2414         case -EBADF:
2415                 error = ELDLM_BAD_NAMESPACE;
2416                 break;
2417         default:
2418                 error = err_no;
2419         }
2420         return error;
2421 }
2422 EXPORT_SYMBOL(ldlm_errno2error);
2423