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                 imp_conn->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 void client_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_hp_ready_list);
 281         CFS_INIT_LIST_HEAD(&cli->cl_loi_write_list);
 282         CFS_INIT_LIST_HEAD(&cli->cl_loi_read_list);
 283         client_obd_list_lock_init(&cli->cl_loi_list_lock);
 284         cli->cl_r_in_flight = 0;
 285         cli->cl_w_in_flight = 0;
 286
 287         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 288         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 289         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 290         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 291         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 292         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 293         cfs_waitq_init(&cli->cl_destroy_waitq);
 294         atomic_set(&cli->cl_destroy_in_flight, 0);
 295 #ifdef ENABLE_CHECKSUM
 296         /* Turn on checksumming by default. */
 297         cli->cl_checksum = 1;
 298         /*
 299          * The supported checksum types will be worked out at connect time
 300          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 301          * through procfs.
 302          */
 303         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 304 #endif
 305         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 306
 307         /* This value may be changed at connect time in
 308            ptlrpc_connect_interpret. */
 309         cli->cl_max_pages_per_rpc = min((int)PTLRPC_MAX_BRW_PAGES,
 310                                         (int)(1024 * 1024 >> CFS_PAGE_SHIFT));
 311
 312         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 313                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
 314         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 128 /* MB */) {
 315                 cli->cl_max_rpcs_in_flight = 2;
 316         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 256 /* MB */) {
 317                 cli->cl_max_rpcs_in_flight = 3;
 318         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 512 /* MB */) {
 319                 cli->cl_max_rpcs_in_flight = 4;
 320         } else {
 321                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 322         }
 323
 324         rc = ldlm_get_ref();
 325         if (rc) {
 326                 CERROR("ldlm_get_ref failed: %d\n", rc);
 327                 GOTO(err, rc);
 328         }
 329
 330         ptlrpc_init_client(rq_portal, rp_portal, name,
 331                            &obddev->obd_ldlm_client);
 332
 333         imp = class_new_import(obddev);
 334         if (imp == NULL)
 335                 GOTO(err_ldlm, rc = -ENOENT);
 336         imp->imp_client = &obddev->obd_ldlm_client;
 337         imp->imp_connect_op = connect_op;
 338         imp->imp_initial_recov = 1;
 339         imp->imp_initial_recov_bk = 0;
 340         CFS_INIT_LIST_HEAD(&imp->imp_pinger_chain);
 341         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 342                LUSTRE_CFG_BUFLEN(lcfg, 1));
 343         class_import_put(imp);
 344
 345         rc = client_import_add_conn(imp, &server_uuid, 1);
 346         if (rc) {
 347                 CERROR("can't add initial connection\n");
 348                 GOTO(err_import, rc);
 349         }
 350
 351         cli->cl_import = imp;
 352         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 353         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 354         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 355
 356         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 357                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 358                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 359                                name, obddev->obd_name,
 360                                cli->cl_target_uuid.uuid);
 361                         spin_lock(&imp->imp_lock);
 362                         imp->imp_invalid = 1;
 363                         spin_unlock(&imp->imp_lock);
 364                 }
 365         }
 366
 367         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 368
 369         RETURN(rc);
 370
 371 err_import:
 372         class_destroy_import(imp);
 373 err_ldlm:
 374         ldlm_put_ref();
 375 err:
 376         RETURN(rc);
 377
 378 }
 379
 380 int client_obd_cleanup(struct obd_device *obddev)
 381 {
 382         ENTRY;
 383         ldlm_put_ref();
 384         RETURN(0);
 385 }
 386
 387 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 388 int client_connect_import(const struct lu_env *env,
 389                           struct obd_export **exp,
 390                           struct obd_device *obd, struct obd_uuid *cluuid,
 391                           struct obd_connect_data *data, void *localdata)
 392 {
 393         struct client_obd *cli = &obd->u.cli;
 394         struct obd_import *imp = cli->cl_import;
 395         struct obd_connect_data *ocd;
 396         struct ldlm_namespace *to_be_freed = NULL;
 397         struct lustre_handle conn = { 0 };
 398         int rc;
 399         ENTRY;
 400
 401         *exp = NULL;
 402         down_write(&cli->cl_sem);
 403         if (cli->cl_conn_count > 0 )
 404                 GOTO(out_sem, rc = -EALREADY);
 405
 406         rc = class_connect(&conn, obd, cluuid);
 407         if (rc)
 408                 GOTO(out_sem, rc);
 409
 410         cli->cl_conn_count++;
 411         *exp = class_conn2export(&conn);
 412
 413         if (obd->obd_namespace != NULL)
 414                 CERROR("already have namespace!\n");
 415
 416         /*
 417          * Deadlock case - bug 18380
 418          */
 419         up_write(&cli->cl_sem);
 420         obd->obd_namespace = ldlm_namespace_new(obd, obd->obd_name,
 421                                                 LDLM_NAMESPACE_CLIENT,
 422                                                 LDLM_NAMESPACE_GREEDY);
 423         down_write(&cli->cl_sem);
 424         if (obd->obd_namespace == NULL)
 425                 GOTO(out_disco, rc = -ENOMEM);
 426
 427         imp->imp_dlm_handle = conn;
 428         rc = ptlrpc_init_import(imp);
 429         if (rc != 0)
 430                 GOTO(out_ldlm, rc);
 431
 432         ocd = &imp->imp_connect_data;
 433         if (data) {
 434                 *ocd = *data;
 435                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 436         }
 437
 438         rc = ptlrpc_connect_import(imp, NULL);
 439         if (rc != 0) {
 440                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 441                 GOTO(out_ldlm, rc);
 442         }
 443         LASSERT((*exp)->exp_connection);
 444
 445         if (data) {
 446                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 447                          ocd->ocd_connect_flags, "old "LPX64", new "LPX64"\n",
 448                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 449                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 450         }
 451
 452         ptlrpc_pinger_add_import(imp);
 453
 454         EXIT;
 455
 456         if (rc) {
 457 out_ldlm:
 458                 ldlm_namespace_free_prior(obd->obd_namespace, imp, 0);
 459                 to_be_freed = obd->obd_namespace;
 460                 obd->obd_namespace = NULL;
 461 out_disco:
 462                 cli->cl_conn_count--;
 463                 class_disconnect(*exp);
 464                 *exp = NULL;
 465         }
 466 out_sem:
 467         up_write(&cli->cl_sem);
 468         if (to_be_freed)
 469                 ldlm_namespace_free_post(to_be_freed);
 470
 471         return rc;
 472 }
 473
 474 int client_disconnect_export(struct obd_export *exp)
 475 {
 476         struct obd_device *obd = class_exp2obd(exp);
 477         struct client_obd *cli;
 478         struct obd_import *imp;
 479         int rc = 0, err;
 480         struct ldlm_namespace *to_be_freed = NULL;
 481         ENTRY;
 482
 483         if (!obd) {
 484                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 485                        exp, exp ? exp->exp_handle.h_cookie : -1);
 486                 RETURN(-EINVAL);
 487         }
 488
 489         cli = &obd->u.cli;
 490         imp = cli->cl_import;
 491
 492         down_write(&cli->cl_sem);
 493         if (!cli->cl_conn_count) {
 494                 CERROR("disconnecting disconnected device (%s)\n",
 495                        obd->obd_name);
 496                 GOTO(out_sem, rc = -EINVAL);
 497         }
 498
 499         cli->cl_conn_count--;
 500         if (cli->cl_conn_count)
 501                 GOTO(out_no_disconnect, rc = 0);
 502
 503         /* Mark import deactivated now, so we don't try to reconnect if any
 504          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
 505          * fully deactivate the import, or that would drop all requests. */
 506         spin_lock(&imp->imp_lock);
 507         imp->imp_deactive = 1;
 508         spin_unlock(&imp->imp_lock);
 509
 510         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 511          * delete it regardless.  (It's safe to delete an import that was
 512          * never added.) */
 513         (void)ptlrpc_pinger_del_import(imp);
 514
 515         if (obd->obd_namespace != NULL) {
 516                 /* obd_force == local only */
 517                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 518                                        obd->obd_force ? LDLM_FL_LOCAL_ONLY:0,
 519                                        NULL);
 520                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 521                 to_be_freed = obd->obd_namespace;
 522         }
 523
 524         /*
 525          * there's no necessary to hold sem during diconnecting an import,
 526          * and actually it may cause deadlock in gss.
 527          */
 528         up_write(&cli->cl_sem);
 529         rc = ptlrpc_disconnect_import(imp, 0);
 530         down_write(&cli->cl_sem);
 531
 532         ptlrpc_invalidate_import(imp);
 533         /* set obd_namespace to NULL only after invalidate, because we can have
 534          * some connect requests in flight, and his need store a connect flags
 535          * in obd_namespace. bug 14260 */
 536         obd->obd_namespace = NULL;
 537
 538         if (imp->imp_rq_pool) {
 539                 ptlrpc_free_rq_pool(imp->imp_rq_pool);
 540                 imp->imp_rq_pool = NULL;
 541         }
 542         client_destroy_import(imp);
 543         cli->cl_import = NULL;
 544
 545         EXIT;
 546  out_no_disconnect:
 547         err = class_disconnect(exp);
 548         if (!rc && err)
 549                 rc = err;
 550  out_sem:
 551         up_write(&cli->cl_sem);
 552         if (to_be_freed)
 553                 ldlm_namespace_free_post(to_be_freed);
 554
 555         RETURN(rc);
 556 }
 557
 558 /* --------------------------------------------------------------------------
 559  * from old lib/target.c
 560  * -------------------------------------------------------------------------- */
 561
 562 static int target_handle_reconnect(struct lustre_handle *conn,
 563                                    struct obd_export *exp,
 564                                    struct obd_uuid *cluuid)
 565 {
 566         ENTRY;
 567         if (exp->exp_connection && exp->exp_imp_reverse) {
 568                 struct lustre_handle *hdl;
 569                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 570                 /* Might be a re-connect after a partition. */
 571                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 572                         CWARN("%s: %s reconnecting\n", exp->exp_obd->obd_name,
 573                               cluuid->uuid);
 574                         conn->cookie = exp->exp_handle.h_cookie;
 575                         /* target_handle_connect() treats EALREADY and
 576                          * -EALREADY differently.  EALREADY means we are
 577                          * doing a valid reconnect from the same client. */
 578                         RETURN(EALREADY);
 579                 } else {
 580                         CERROR("%s reconnecting from %s, "
 581                                "handle mismatch (ours "LPX64", theirs "
 582                                LPX64")\n", cluuid->uuid,
 583                                exp->exp_connection->c_remote_uuid.uuid,
 584                                hdl->cookie, conn->cookie);
 585                         memset(conn, 0, sizeof *conn);
 586                         /* target_handle_connect() treats EALREADY and
 587                          * -EALREADY differently.  -EALREADY is an error
 588                          * (same UUID, different handle). */
 589                         RETURN(-EALREADY);
 590                 }
 591         }
 592
 593         conn->cookie = exp->exp_handle.h_cookie;
 594         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
 595                cluuid->uuid, exp, conn->cookie);
 596         RETURN(0);
 597 }
 598
 599 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
 600                           int error)
 601 {
 602         struct obd_export *exp = cb_data;
 603
 604         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 605                obd->obd_name, exp->exp_client_uuid.uuid);
 606
 607         spin_lock(&exp->exp_lock);
 608         exp->exp_need_sync = 0;
 609         spin_unlock(&exp->exp_lock);
 610 }
 611 EXPORT_SYMBOL(target_client_add_cb);
 612 static void
 613 target_start_and_reset_recovery_timer(struct obd_device *obd,
 614                                       struct ptlrpc_request *req,
 615                                       int new_client);
 616
 617 int target_handle_connect(struct ptlrpc_request *req)
 618 {
 619         struct obd_device *target, *targref = NULL;
 620         struct obd_export *export = NULL;
 621         struct obd_import *revimp;
 622         struct lustre_handle conn;
 623         struct lustre_handle *tmp;
 624         struct obd_uuid tgtuuid;
 625         struct obd_uuid cluuid;
 626         struct obd_uuid remote_uuid;
 627         char *str;
 628         int rc = 0;
 629         int mds_conn = 0;
 630         struct obd_connect_data *data, *tmpdata;
 631         lnet_nid_t *client_nid = NULL;
 632         ENTRY;
 633
 634         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 635
 636         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 637         if (str == NULL) {
 638                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 639                 GOTO(out, rc = -EINVAL);
 640         }
 641
 642         obd_str2uuid(&tgtuuid, str);
 643         target = class_uuid2obd(&tgtuuid);
 644         if (!target)
 645                 target = class_name2obd(str);
 646
 647         if (!target || target->obd_stopping || !target->obd_set_up) {
 648                 LCONSOLE_ERROR_MSG(0x137, "UUID '%s' is not available "
 649                                    " for connect (%s)\n", str,
 650                                    !target ? "no target" :
 651                                    (target->obd_stopping ? "stopping" :
 652                                    "not set up"));
 653                 GOTO(out, rc = -ENODEV);
 654         }
 655
 656         if (target->obd_no_conn) {
 657                 LCONSOLE_WARN("%s: temporarily refusing client connection "
 658                               "from %s\n", target->obd_name,
 659                               libcfs_nid2str(req->rq_peer.nid));
 660                 GOTO(out, rc = -EAGAIN);
 661         }
 662
 663         /* Make sure the target isn't cleaned up while we're here. Yes,
 664            there's still a race between the above check and our incref here.
 665            Really, class_uuid2obd should take the ref. */
 666         targref = class_incref(target, __FUNCTION__, cfs_current());
 667
 668
 669         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
 670         if (str == NULL) {
 671                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
 672                 GOTO(out, rc = -EINVAL);
 673         }
 674
 675         obd_str2uuid(&cluuid, str);
 676
 677         /* XXX extract a nettype and format accordingly */
 678         switch (sizeof(lnet_nid_t)) {
 679                 /* NB the casts only avoid compiler warnings */
 680         case 8:
 681                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 682                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
 683                 break;
 684         case 4:
 685                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 686                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
 687                 break;
 688         default:
 689                 LBUG();
 690         }
 691
 692         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 693         if (tmp == NULL)
 694                 GOTO(out, rc = -EPROTO);
 695
 696         conn = *tmp;
 697
 698         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 699         if (!data)
 700                 GOTO(out, rc = -EPROTO);
 701
 702         rc = req_capsule_server_pack(&req->rq_pill);
 703         if (rc)
 704                 GOTO(out, rc);
 705
 706         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 707                 if (!data) {
 708                         DEBUG_REQ(D_WARNING, req, "Refusing old (unversioned) "
 709                                   "libclient connection attempt");
 710                         GOTO(out, rc = -EPROTO);
 711                 } else if (data->ocd_version < LUSTRE_VERSION_CODE -
 712                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
 713                            data->ocd_version > LUSTRE_VERSION_CODE +
 714                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
 715                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
 716                                   "libclient connection attempt",
 717                                   data->ocd_version < LUSTRE_VERSION_CODE ?
 718                                   "old" : "new",
 719                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
 720                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
 721                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
 722                                   OBD_OCD_VERSION_FIX(data->ocd_version));
 723                         data = req_capsule_server_sized_get(&req->rq_pill,
 724                                                         &RMF_CONNECT_DATA,
 725                                     offsetof(typeof(*data), ocd_version) +
 726                                              sizeof(data->ocd_version));
 727                         if (data) {
 728                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
 729                                 data->ocd_version = LUSTRE_VERSION_CODE;
 730                         }
 731                         GOTO(out, rc = -EPROTO);
 732                 }
 733         }
 734
 735         if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) &&
 736             (data->ocd_connect_flags & OBD_CONNECT_MDS))
 737                 mds_conn = 1;
 738
 739         /* lctl gets a backstage, all-access pass. */
 740         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 741                 goto dont_check_exports;
 742
 743         export = lustre_hash_lookup(target->obd_uuid_hash, &cluuid);
 744         if (!export)
 745                 goto no_export;
 746
 747         /* we've found an export in the hash */
 748         if (export->exp_connecting) { /* bug 9635, et. al. */
 749                 CWARN("%s: exp %p already connecting\n",
 750                       export->exp_obd->obd_name, export);
 751                 class_export_put(export);
 752                 export = NULL;
 753                 rc = -EALREADY;
 754         } else if (mds_conn && export->exp_connection) {
 755                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid)
 756                         /* mds reconnected after failover */
 757                         CWARN("%s: received MDS connection from NID %s,"
 758                               " removing former export from NID %s\n",
 759                             target->obd_name, libcfs_nid2str(req->rq_peer.nid),
 760                             libcfs_nid2str(export->exp_connection->c_peer.nid));
 761                 else
 762                         /* new mds connection from the same nid */
 763                         CWARN("%s: received new MDS connection from NID %s,"
 764                               " removing former export from same NID\n",
 765                             target->obd_name, libcfs_nid2str(req->rq_peer.nid));
 766                 class_fail_export(export);
 767                 class_export_put(export);
 768                 export = NULL;
 769                 rc = 0;
 770         } else if (export->exp_connection != NULL &&
 771                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
 772                 /* in mds failover we have static uuid but nid can be
 773                  * changed*/
 774                 CWARN("%s: cookie %s seen on new NID %s when "
 775                       "existing NID %s is already connected\n",
 776                       target->obd_name, cluuid.uuid,
 777                       libcfs_nid2str(req->rq_peer.nid),
 778                       libcfs_nid2str(export->exp_connection->c_peer.nid));
 779                 rc = -EALREADY;
 780                 class_export_put(export);
 781                 export = NULL;
 782         } else {
 783                 spin_lock(&export->exp_lock);
 784                 export->exp_connecting = 1;
 785                 spin_unlock(&export->exp_lock);
 786                 class_export_put(export);
 787                 LASSERT(export->exp_obd == target);
 788
 789                 rc = target_handle_reconnect(&conn, export, &cluuid);
 790         }
 791
 792         /* If we found an export, we already unlocked. */
 793         if (!export) {
 794 no_export:
 795                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
 796         } else if (req->rq_export == NULL &&
 797                    atomic_read(&export->exp_rpc_count) > 0) {
 798                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
 799                       target->obd_name, cluuid.uuid,
 800                       libcfs_nid2str(req->rq_peer.nid),
 801                       export, atomic_read(&export->exp_refcount));
 802                 GOTO(out, rc = -EBUSY);
 803         } else if (req->rq_export != NULL &&
 804                    (atomic_read(&export->exp_rpc_count) > 1)) {
 805                 /* the current connect rpc has increased exp_rpc_count */
 806                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
 807                       target->obd_name, cluuid.uuid,
 808                       libcfs_nid2str(req->rq_peer.nid),
 809                       export, atomic_read(&export->exp_rpc_count) - 1);
 810                 GOTO(out, rc = -EBUSY);
 811         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
 812                 CERROR("%s: NID %s (%s) reconnected with 1 conn_cnt; "
 813                        "cookies not random?\n", target->obd_name,
 814                        libcfs_nid2str(req->rq_peer.nid), cluuid.uuid);
 815                 GOTO(out, rc = -EALREADY);
 816         } else {
 817                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
 818         }
 819
 820         if (rc < 0) {
 821                 GOTO(out, rc);
 822         }
 823
 824         CWARN("%s: connection from %s@%s %st"LPU64" exp %p cur %ld last %ld\n",
 825                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 826               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
 827               export, (long)cfs_time_current_sec(),
 828               export ? (long)export->exp_last_request_time : 0);
 829
 830         /* Tell the client if we're in recovery. */
 831         if (target->obd_recovering) {
 832                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 833                 /* If this is the first time a client connects,
 834                    reset the recovery timer */
 835                 if (rc == 0)
 836                         target_start_and_reset_recovery_timer(target, req,
 837                                                               !export);
 838         }
 839
 840         /* We want to handle EALREADY but *not* -EALREADY from
 841          * target_handle_reconnect(), return reconnection state in a flag */
 842         if (rc == EALREADY) {
 843                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 844                 rc = 0;
 845         } else {
 846                 LASSERT(rc == 0);
 847         }
 848
 849         /* Tell the client if we support replayable requests */
 850         if (target->obd_replayable)
 851                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 852         client_nid = &req->rq_peer.nid;
 853
 854         if (export == NULL) {
 855                 if (target->obd_recovering) {
 856                         cfs_time_t t;
 857
 858                         t = cfs_timer_deadline(&target->obd_recovery_timer);
 859                         t = cfs_time_sub(t, cfs_time_current());
 860                         CERROR("%s: denying connection for new client %s (%s): "
 861                                "%d clients in recovery for "CFS_TIME_T"s\n",
 862                                target->obd_name,
 863                                libcfs_nid2str(req->rq_peer.nid), cluuid.uuid,
 864                                target->obd_recoverable_clients,
 865                                cfs_duration_sec(t));
 866                         rc = -EBUSY;
 867                 } else {
 868 dont_check_exports:
 869                         rc = obd_connect(req->rq_svc_thread->t_env,
 870                                          &export, target, &cluuid, data,
 871                                          client_nid);
 872                         if (rc == 0)
 873                                 conn.cookie = export->exp_handle.h_cookie;
 874                 }
 875         } else {
 876                 rc = obd_reconnect(req->rq_svc_thread->t_env,
 877                                    export, target, &cluuid, data, client_nid);
 878                 if (rc == 0)
 879                         /* prevous done via class_conn2export */
 880                         class_export_get(export);
 881         }
 882         if (rc)
 883                 GOTO(out, rc);
 884         /* Return only the parts of obd_connect_data that we understand, so the
 885          * client knows that we don't understand the rest. */
 886         if (data) {
 887                  tmpdata = req_capsule_server_get(&req->rq_pill,
 888                                                   &RMF_CONNECT_DATA);
 889                   //data->ocd_connect_flags &= OBD_CONNECT_SUPPORTED;
 890                  *tmpdata = *data;
 891         }
 892
 893         /* If all else goes well, this is our RPC return code. */
 894         req->rq_status = 0;
 895
 896         lustre_msg_set_handle(req->rq_repmsg, &conn);
 897
 898         /* If the client and the server are the same node, we will already
 899          * have an export that really points to the client's DLM export,
 900          * because we have a shared handles table.
 901          *
 902          * XXX this will go away when shaver stops sending the "connect" handle
 903          * in the real "remote handle" field of the request --phik 24 Apr 2003
 904          */
 905         if (req->rq_export != NULL)
 906                 class_export_put(req->rq_export);
 907
 908         req->rq_export = export;
 909
 910         spin_lock(&export->exp_lock);
 911         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
 912                 spin_unlock(&export->exp_lock);
 913                 CERROR("%s: %s already connected at higher conn_cnt: %d > %d\n",
 914                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 915                        export->exp_conn_cnt,
 916                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
 917
 918                 GOTO(out, rc = -EALREADY);
 919         }
 920         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
 921
 922         /* request from liblustre?  Don't evict it for not pinging. */
 923         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 924                 export->exp_libclient = 1;
 925                 spin_unlock(&export->exp_lock);
 926
 927                 spin_lock(&target->obd_dev_lock);
 928                 list_del_init(&export->exp_obd_chain_timed);
 929                 spin_unlock(&target->obd_dev_lock);
 930         } else {
 931                 spin_unlock(&export->exp_lock);
 932         }
 933
 934         if (export->exp_connection != NULL)
 935                 ptlrpc_connection_put(export->exp_connection);
 936         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
 937                                                        req->rq_self,
 938                                                        &remote_uuid);
 939         if (hlist_unhashed(&export->exp_nid_hash)) {
 940                 lustre_hash_add_unique(export->exp_obd->obd_nid_hash,
 941                                        &export->exp_connection->c_peer.nid,
 942                                        &export->exp_nid_hash);
 943         }
 944
 945         spin_lock_bh(&target->obd_processing_task_lock);
 946         if (target->obd_recovering && !export->exp_in_recovery) {
 947                 spin_lock(&export->exp_lock);
 948                 export->exp_in_recovery = 1;
 949                 export->exp_req_replay_needed = 1;
 950                 export->exp_lock_replay_needed = 1;
 951                 spin_unlock(&export->exp_lock);
 952                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
 953                      && (data->ocd_transno == 0))
 954                         CWARN("Connect with zero transno!\n");
 955
 956                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
 957                      && data->ocd_transno < target->obd_next_recovery_transno)
 958                         target->obd_next_recovery_transno = data->ocd_transno;
 959                 target->obd_connected_clients++;
 960                 /* each connected client is counted as recoverable */
 961                 target->obd_recoverable_clients++;
 962                 atomic_inc(&target->obd_req_replay_clients);
 963                 atomic_inc(&target->obd_lock_replay_clients);
 964                 if (target->obd_connected_clients ==
 965                     target->obd_max_recoverable_clients)
 966                         cfs_waitq_signal(&target->obd_next_transno_waitq);
 967         }
 968         spin_unlock_bh(&target->obd_processing_task_lock);
 969         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 970         conn = *tmp;
 971
 972         if (export->exp_imp_reverse != NULL) {
 973                 /* destroyed import can be still referenced in ctxt */
 974                 obd_set_info_async(export, sizeof(KEY_REVIMP_UPD),
 975                                    KEY_REVIMP_UPD, 0, NULL, NULL);
 976
 977                 /* in some recovery senarios, previous ctx init rpc handled
 978                  * in sptlrpc_target_export_check() might be used to install
 979                  * a reverse ctx in this reverse import, and later OBD_CONNECT
 980                  * using the same gss ctx could reach here and following new
 981                  * reverse import. note all reverse ctx in new/old import are
 982                  * actually based on the same gss ctx. so we invalidate ctx
 983                  * here before destroy import, otherwise flush old import will
 984                  * lead to remote reverse ctx be destroied, thus the reverse
 985                  * ctx of new import will lost its peer.
 986                  * there might be a better way to deal with this???
 987                  */
 988                 sptlrpc_import_inval_all_ctx(export->exp_imp_reverse);
 989
 990                 client_destroy_import(export->exp_imp_reverse);
 991         }
 992
 993         /* for the rest part, we return -ENOTCONN in case of errors
 994          * in order to let client initialize connection again.
 995          */
 996         revimp = export->exp_imp_reverse = class_new_import(target);
 997         if (!revimp) {
 998                 CERROR("fail to alloc new reverse import.\n");
 999                 GOTO(out, rc = -ENOTCONN);
1000         }
1001
1002         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
1003         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
1004         revimp->imp_remote_handle = conn;
1005         revimp->imp_dlm_fake = 1;
1006         revimp->imp_state = LUSTRE_IMP_FULL;
1007         /* this is a bit of a layering violation, but much less risk than
1008           * changing this very complex and race-prone code.  bug=16839 */
1009         if (data->ocd_connect_flags & OBD_CONNECT_MDS)
1010                 obd_set_info_async(export, sizeof(KEY_MDS_CONN), KEY_MDS_CONN,
1011                                    0, NULL, NULL);
1012
1013         /* unknown versions will be caught in
1014          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
1015         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1016
1017         if ((export->exp_connect_flags & OBD_CONNECT_AT) &&
1018             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1019                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1020         else
1021                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1022
1023         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
1024         if (rc) {
1025                 CERROR("Failed to get sec for reverse import: %d\n", rc);
1026                 export->exp_imp_reverse = NULL;
1027                 class_destroy_import(revimp);
1028         }
1029
1030         class_import_put(revimp);
1031 out:
1032         if (export) {
1033                 spin_lock(&export->exp_lock);
1034                 export->exp_connecting = 0;
1035                 spin_unlock(&export->exp_lock);
1036         }
1037         if (targref)
1038                 class_decref(targref, __FUNCTION__, cfs_current());
1039         if (rc)
1040                 req->rq_status = rc;
1041         RETURN(rc);
1042 }
1043
1044 int target_handle_disconnect(struct ptlrpc_request *req)
1045 {
1046         int rc;
1047         ENTRY;
1048
1049         rc = req_capsule_server_pack(&req->rq_pill);
1050         if (rc)
1051                 RETURN(rc);
1052
1053         /* keep the rq_export around so we can send the reply */
1054         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1055
1056         RETURN(0);
1057 }
1058
1059 void target_destroy_export(struct obd_export *exp)
1060 {
1061         /* exports created from last_rcvd data, and "fake"
1062            exports created by lctl don't have an import */
1063         if (exp->exp_imp_reverse != NULL)
1064                 client_destroy_import(exp->exp_imp_reverse);
1065
1066         /* We cancel locks at disconnect time, but this will catch any locks
1067          * granted in a race with recovery-induced disconnect. */
1068         if (exp->exp_obd->obd_namespace != NULL)
1069                 ldlm_cancel_locks_for_export(exp);
1070 }
1071
1072 /*
1073  * Recovery functions
1074  */
1075
1076 struct ptlrpc_request *ptlrpc_clone_req( struct ptlrpc_request *orig_req)
1077 {
1078         struct ptlrpc_request *copy_req;
1079         struct lustre_msg *copy_reqmsg;
1080         struct ptlrpc_user_desc *udesc = NULL;
1081
1082         OBD_ALLOC_PTR(copy_req);
1083         if (!copy_req)
1084                 return NULL;
1085         OBD_ALLOC(copy_reqmsg, orig_req->rq_reqlen);
1086         if (!copy_reqmsg){
1087                 OBD_FREE_PTR(copy_req);
1088                 return NULL;
1089         }
1090
1091         if (orig_req->rq_user_desc) {
1092                 int ngroups = orig_req->rq_user_desc->pud_ngroups;
1093
1094                 OBD_ALLOC(udesc, sptlrpc_user_desc_size(ngroups));
1095                 if (!udesc) {
1096                         OBD_FREE(copy_reqmsg, orig_req->rq_reqlen);
1097                         OBD_FREE_PTR(copy_req);
1098                         return NULL;
1099                 }
1100                 memcpy(udesc, orig_req->rq_user_desc,
1101                        sptlrpc_user_desc_size(ngroups));
1102         }
1103
1104         *copy_req = *orig_req;
1105         memcpy(copy_reqmsg, orig_req->rq_reqmsg, orig_req->rq_reqlen);
1106         copy_req->rq_reqmsg = copy_reqmsg;
1107         copy_req->rq_user_desc = udesc;
1108
1109         class_export_rpc_get(copy_req->rq_export);
1110         CFS_INIT_LIST_HEAD(&copy_req->rq_list);
1111         CFS_INIT_LIST_HEAD(&copy_req->rq_replay_list);
1112         sptlrpc_svc_ctx_addref(copy_req);
1113
1114         if (copy_req->rq_reply_state) {
1115                 /* the copied req takes over the reply state */
1116                 orig_req->rq_reply_state = NULL;
1117                 /* to catch further access */
1118                 orig_req->rq_repmsg = NULL;
1119                 orig_req->rq_replen = 0;
1120         }
1121
1122         return copy_req;
1123 }
1124
1125 void ptlrpc_free_clone(struct ptlrpc_request *req)
1126 {
1127         LASSERT(list_empty(&req->rq_replay_list));
1128
1129         ptlrpc_req_drop_rs(req);
1130         sptlrpc_svc_ctx_decref(req);
1131         class_export_rpc_put(req->rq_export);
1132         list_del_init(&req->rq_list);
1133
1134         if (req->rq_user_desc) {
1135                 int ngroups = req->rq_user_desc->pud_ngroups;
1136                 OBD_FREE(req->rq_user_desc, sptlrpc_user_desc_size(ngroups));
1137         }
1138         OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
1139         OBD_FREE_PTR(req);
1140 }
1141
1142 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1143 {
1144         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1145         struct obd_export     *exp = req->rq_export;
1146         struct ptlrpc_request *reqiter;
1147         int                    dup = 0;
1148
1149         LASSERT(exp);
1150
1151         spin_lock(&exp->exp_lock);
1152         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1153                             rq_replay_list) {
1154                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1155                         dup = 1;
1156                         break;
1157                 }
1158         }
1159
1160         if (dup) {
1161                 /* we expect it with RESENT and REPLAY flags */
1162                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1163                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1164                         CERROR("invalid flags %x of resent replay\n",
1165                                lustre_msg_get_flags(req->rq_reqmsg));
1166         } else {
1167                 list_add_tail(&req->rq_replay_list, &exp->exp_req_replay_queue);
1168         }
1169
1170         spin_unlock(&exp->exp_lock);
1171         return dup;
1172 }
1173
1174 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1175 {
1176         LASSERT(!list_empty(&req->rq_replay_list));
1177         LASSERT(req->rq_export);
1178
1179         spin_lock(&req->rq_export->exp_lock);
1180         list_del_init(&req->rq_replay_list);
1181         spin_unlock(&req->rq_export->exp_lock);
1182 }
1183
1184 #ifdef __KERNEL__
1185 static void target_finish_recovery(struct obd_device *obd)
1186 {
1187         ENTRY;
1188         LCONSOLE_INFO("%s: sending delayed replies to recovered clients\n",
1189                       obd->obd_name);
1190
1191         ldlm_reprocess_all_ns(obd->obd_namespace);
1192         spin_lock_bh(&obd->obd_processing_task_lock);
1193         if (list_empty(&obd->obd_req_replay_queue) &&
1194             list_empty(&obd->obd_lock_replay_queue) &&
1195             list_empty(&obd->obd_final_req_queue)) {
1196                 obd->obd_processing_task = 0;
1197         } else {
1198                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1199                        obd->obd_name,
1200                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1201                        list_empty(&obd->obd_lock_replay_queue) ? "" : "lock ",
1202                        list_empty(&obd->obd_final_req_queue) ? "" : "final ");
1203                 spin_unlock_bh(&obd->obd_processing_task_lock);
1204                 LBUG();
1205         }
1206         spin_unlock_bh(&obd->obd_processing_task_lock);
1207
1208         /* when recovery finished, cleanup orphans on mds and ost */
1209         if (OBT(obd) && OBP(obd, postrecov)) {
1210                 int rc = OBP(obd, postrecov)(obd);
1211                 if (rc < 0)
1212                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1213                                       obd->obd_name, rc);
1214         }
1215
1216         obd->obd_recovery_end = cfs_time_current_sec();
1217         EXIT;
1218 }
1219
1220 static void abort_req_replay_queue(struct obd_device *obd)
1221 {
1222         struct ptlrpc_request *req, *n;
1223         struct list_head abort_list;
1224
1225         CFS_INIT_LIST_HEAD(&abort_list);
1226         spin_lock_bh(&obd->obd_processing_task_lock);
1227         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1228         spin_unlock_bh(&obd->obd_processing_task_lock);
1229         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1230                 DEBUG_REQ(D_WARNING, req, "aborted:");
1231                 req->rq_status = -ENOTCONN;
1232                 if (ptlrpc_error(req)) {
1233                         DEBUG_REQ(D_ERROR, req,
1234                                   "failed abort_req_reply; skipping");
1235                 }
1236                 target_exp_dequeue_req_replay(req);
1237                 ptlrpc_free_clone(req);
1238         }
1239 }
1240
1241 static void abort_lock_replay_queue(struct obd_device *obd)
1242 {
1243         struct ptlrpc_request *req, *n;
1244         struct list_head abort_list;
1245
1246         CFS_INIT_LIST_HEAD(&abort_list);
1247         spin_lock_bh(&obd->obd_processing_task_lock);
1248         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1249         spin_unlock_bh(&obd->obd_processing_task_lock);
1250         list_for_each_entry_safe(req, n, &abort_list, rq_list){
1251                 DEBUG_REQ(D_ERROR, req, "aborted:");
1252                 req->rq_status = -ENOTCONN;
1253                 if (ptlrpc_error(req)) {
1254                         DEBUG_REQ(D_ERROR, req,
1255                                   "failed abort_lock_reply; skipping");
1256                 }
1257                 ptlrpc_free_clone(req);
1258         }
1259 }
1260 #endif
1261
1262 /* Called from a cleanup function if the device is being cleaned up
1263    forcefully.  The exports should all have been disconnected already,
1264    the only thing left to do is
1265      - clear the recovery flags
1266      - cancel the timer
1267      - free queued requests and replies, but don't send replies
1268    Because the obd_stopping flag is set, no new requests should be received.
1269
1270 */
1271 void target_cleanup_recovery(struct obd_device *obd)
1272 {
1273         struct ptlrpc_request *req, *n;
1274         struct list_head clean_list;
1275         ENTRY;
1276
1277         LASSERT(obd->obd_stopping);
1278
1279         CFS_INIT_LIST_HEAD(&clean_list);
1280         spin_lock_bh(&obd->obd_processing_task_lock);
1281         if (!obd->obd_recovering) {
1282                 spin_unlock_bh(&obd->obd_processing_task_lock);
1283                 EXIT;
1284                 return;
1285         }
1286         obd->obd_recovering = obd->obd_abort_recovery = 0;
1287         target_cancel_recovery_timer(obd);
1288
1289         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1290         spin_unlock_bh(&obd->obd_processing_task_lock);
1291
1292         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1293                 LASSERT(req->rq_reply_state == 0);
1294                 target_exp_dequeue_req_replay(req);
1295                 ptlrpc_free_clone(req);
1296         }
1297
1298         spin_lock_bh(&obd->obd_processing_task_lock);
1299         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1300         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1301         spin_unlock_bh(&obd->obd_processing_task_lock);
1302
1303         list_for_each_entry_safe(req, n, &clean_list, rq_list){
1304                 LASSERT(req->rq_reply_state == 0);
1305                 ptlrpc_free_clone(req);
1306         }
1307
1308         EXIT;
1309 }
1310
1311 /* obd_processing_task_lock should be held */
1312 void target_cancel_recovery_timer(struct obd_device *obd)
1313 {
1314         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1315         cfs_timer_disarm(&obd->obd_recovery_timer);
1316 }
1317
1318 /* extend = 1 means require at least "duration" seconds left in the timer,
1319    extend = 0 means set the total duration (start_recovery_timer) */
1320 static void reset_recovery_timer(struct obd_device *obd, int duration,
1321                                  int extend)
1322 {
1323         cfs_time_t now = cfs_time_current_sec();
1324         cfs_duration_t left;
1325
1326         spin_lock_bh(&obd->obd_processing_task_lock);
1327         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1328                 spin_unlock_bh(&obd->obd_processing_task_lock);
1329                 return;
1330         }
1331
1332         left = cfs_time_sub(obd->obd_recovery_end, now);
1333
1334         if (extend && (duration > left))
1335                 obd->obd_recovery_timeout += duration - left;
1336         else if (!extend && (duration > obd->obd_recovery_timeout))
1337                 /* Track the client's largest expected replay time */
1338                 obd->obd_recovery_timeout = duration;
1339 #ifdef CRAY_XT3
1340         /*
1341          * If total recovery time already exceed the
1342          * obd_recovery_max_time, then CRAY XT3 will
1343          * abort the recovery
1344          */
1345         if(obd->obd_recovery_timeout > obd->obd_recovery_max_time)
1346                 obd->obd_recovery_timeout = obd->obd_recovery_max_time;
1347 #endif
1348         obd->obd_recovery_end = obd->obd_recovery_start +
1349                                 obd->obd_recovery_timeout;
1350         if (!cfs_timer_is_armed(&obd->obd_recovery_timer) ||
1351             cfs_time_before(now, obd->obd_recovery_end)) {
1352                 left = cfs_time_sub(obd->obd_recovery_end, now);
1353                 cfs_timer_arm(&obd->obd_recovery_timer, cfs_time_shift(left));
1354         }
1355         spin_unlock_bh(&obd->obd_processing_task_lock);
1356         CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
1357                obd->obd_name, (unsigned)left);
1358 }
1359
1360 static void check_and_start_recovery_timer(struct obd_device *obd)
1361 {
1362         spin_lock_bh(&obd->obd_processing_task_lock);
1363         if (cfs_timer_is_armed(&obd->obd_recovery_timer)) {
1364                 spin_unlock_bh(&obd->obd_processing_task_lock);
1365                 return;
1366         }
1367         CDEBUG(D_HA, "%s: starting recovery timer\n", obd->obd_name);
1368         obd->obd_recovery_start = cfs_time_current_sec();
1369         /* minimum */
1370         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1371         spin_unlock_bh(&obd->obd_processing_task_lock);
1372
1373         reset_recovery_timer(obd, obd->obd_recovery_timeout, 0);
1374 }
1375
1376 /* Reset the timer with each new client connection */
1377 /*
1378  * This timer is actually reconnect_timer, which is for making sure
1379  * the total recovery window is at least as big as my reconnect
1380  * attempt timing. So the initial recovery time_out will be set to
1381  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1382  * from client is bigger than this, then the recovery time_out will
1383  * be extend to make sure the client could be reconnected, in the
1384  * process, the timeout from the new client should be ignored.
1385  */
1386
1387 static void
1388 target_start_and_reset_recovery_timer(struct obd_device *obd,
1389                                       struct ptlrpc_request *req,
1390                                       int new_client)
1391 {
1392         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1393
1394         if (!new_client && service_time)
1395                 /* Teach server about old server's estimates, as first guess
1396                  * at how long new requests will take. */
1397                 at_add(&req->rq_rqbd->rqbd_service->srv_at_estimate,
1398                        service_time);
1399
1400         check_and_start_recovery_timer(obd);
1401
1402         /* convert the service time to rpc timeout,
1403          * reuse service_time to limit stack usage */
1404         service_time = at_est2timeout(service_time);
1405
1406         /* We expect other clients to timeout within service_time, then try
1407          * to reconnect, then try the failover server.  The max delay between
1408          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL */
1409         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC +
1410                              INITIAL_CONNECT_TIMEOUT);
1411         if (service_time > obd->obd_recovery_timeout && !new_client)
1412                 reset_recovery_timer(obd, service_time, 0);
1413 }
1414
1415 #ifdef __KERNEL__
1416 static int check_for_next_transno(struct obd_device *obd)
1417 {
1418         struct ptlrpc_request *req = NULL;
1419         int wake_up = 0, connected, completed, queue_len, max;
1420         __u64 next_transno, req_transno;
1421         ENTRY;
1422         spin_lock_bh(&obd->obd_processing_task_lock);
1423
1424         if (!list_empty(&obd->obd_req_replay_queue)) {
1425                 req = list_entry(obd->obd_req_replay_queue.next,
1426                                  struct ptlrpc_request, rq_list);
1427                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1428         } else {
1429                 req_transno = 0;
1430         }
1431
1432         max = obd->obd_max_recoverable_clients;
1433         connected = obd->obd_connected_clients;
1434         completed = connected - obd->obd_recoverable_clients;
1435         queue_len = obd->obd_requests_queued_for_recovery;
1436         next_transno = obd->obd_next_recovery_transno;
1437
1438         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1439                "req_transno: "LPU64", next_transno: "LPU64"\n",
1440                max, connected, completed, queue_len, req_transno, next_transno);
1441
1442         if (obd->obd_abort_recovery) {
1443                 CDEBUG(D_HA, "waking for aborted recovery\n");
1444                 wake_up = 1;
1445         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1446                 CDEBUG(D_HA, "waking for completed recovery\n");
1447                 wake_up = 1;
1448         } else if (req_transno == next_transno) {
1449                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1450                 wake_up = 1;
1451         } else if (queue_len + completed == max) {
1452                 /* handle gaps occured due to lost reply. It is allowed gaps
1453                  * because all clients are connected and there will be resend
1454                  * for missed transaction */
1455                 LASSERTF(req_transno >= next_transno,
1456                          "req_transno: "LPU64", next_transno: "LPU64"\n",
1457                          req_transno, next_transno);
1458
1459                 CDEBUG(req_transno > obd->obd_last_committed ? D_ERROR : D_HA,
1460                        "waking for skipped transno (skip: "LPD64
1461                        ", ql: %d, comp: %d, conn: %d, next: "LPD64")\n",
1462                        next_transno, queue_len, completed, connected, req_transno);
1463                 obd->obd_next_recovery_transno = req_transno;
1464                 wake_up = 1;
1465         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1466                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1467                        " by fail_lock, waking up ("LPD64")\n", next_transno);
1468                 obd->obd_next_recovery_transno = req_transno;
1469                 wake_up = 1;
1470         } else if (queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1471                 /* some clients haven't connected in time, but we can try
1472                  * to replay requests that demand on already committed ones
1473                  * also, we can replay first non-committed transation */
1474                 LASSERT(req_transno != 0);
1475                 if (obd->obd_version_recov ||
1476                     req_transno == obd->obd_last_committed + 1) {
1477                         obd->obd_next_recovery_transno = req_transno;
1478                 } else if (req_transno > obd->obd_last_committed) {
1479                         /* can't continue recovery: have no needed transno */
1480                         obd->obd_abort_recovery = 1;
1481                         CDEBUG(D_ERROR, "abort due to missed clients. max: %d, "
1482                                "connected: %d, completed: %d, queue_len: %d, "
1483                                "req_transno: "LPU64", next_transno: "LPU64"\n",
1484                                max, connected, completed, queue_len,
1485                                req_transno, next_transno);
1486                 }
1487                 wake_up = 1;
1488         }
1489
1490         spin_unlock_bh(&obd->obd_processing_task_lock);
1491         return wake_up;
1492 }
1493
1494 static struct ptlrpc_request *target_next_replay_req(struct obd_device *obd)
1495 {
1496         struct l_wait_info lwi = { 0 };
1497         struct ptlrpc_request *req;
1498
1499         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1500                obd->obd_next_recovery_transno);
1501         l_wait_event(obd->obd_next_transno_waitq,
1502                      check_for_next_transno(obd), &lwi);
1503
1504         spin_lock_bh(&obd->obd_processing_task_lock);
1505         if (obd->obd_abort_recovery) {
1506                 req = NULL;
1507         } else if (!list_empty(&obd->obd_req_replay_queue)) {
1508                 req = list_entry(obd->obd_req_replay_queue.next,
1509                                  struct ptlrpc_request, rq_list);
1510                 target_exp_dequeue_req_replay(req);
1511                 list_del_init(&req->rq_list);
1512                 obd->obd_requests_queued_for_recovery--;
1513         } else {
1514                 req = NULL;
1515         }
1516         spin_unlock_bh(&obd->obd_processing_task_lock);
1517         RETURN(req);
1518 }
1519
1520 static int check_for_next_lock(struct obd_device *obd)
1521 {
1522         struct ptlrpc_request *req = NULL;
1523         int wake_up = 0;
1524
1525         spin_lock_bh(&obd->obd_processing_task_lock);
1526         if (!list_empty(&obd->obd_lock_replay_queue)) {
1527                 req = list_entry(obd->obd_lock_replay_queue.next,
1528                                  struct ptlrpc_request, rq_list);
1529                 CDEBUG(D_HA, "waking for next lock\n");
1530                 wake_up = 1;
1531         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1532                 CDEBUG(D_HA, "waking for completed lock replay\n");
1533                 wake_up = 1;
1534         } else if (obd->obd_abort_recovery) {
1535                 CDEBUG(D_HA, "waking for aborted recovery\n");
1536                 wake_up = 1;
1537         }
1538         spin_unlock_bh(&obd->obd_processing_task_lock);
1539
1540         return wake_up;
1541 }
1542
1543 static struct ptlrpc_request *target_next_replay_lock(struct obd_device *obd)
1544 {
1545         struct l_wait_info lwi = { 0 };
1546         struct ptlrpc_request *req;
1547
1548         CDEBUG(D_HA, "Waiting for lock\n");
1549         l_wait_event(obd->obd_next_transno_waitq,
1550                      check_for_next_lock(obd), &lwi);
1551
1552         spin_lock_bh(&obd->obd_processing_task_lock);
1553         if (obd->obd_abort_recovery) {
1554                 req = NULL;
1555         } else if (!list_empty(&obd->obd_lock_replay_queue)) {
1556                 req = list_entry(obd->obd_lock_replay_queue.next,
1557                                  struct ptlrpc_request, rq_list);
1558                 list_del_init(&req->rq_list);
1559         } else {
1560                 req = NULL;
1561         }
1562         spin_unlock_bh(&obd->obd_processing_task_lock);
1563         return req;
1564 }
1565
1566 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
1567 {
1568         struct ptlrpc_request *req;
1569
1570         spin_lock_bh(&obd->obd_processing_task_lock);
1571         if (!list_empty(&obd->obd_final_req_queue)) {
1572                 req = list_entry(obd->obd_final_req_queue.next,
1573                                  struct ptlrpc_request, rq_list);
1574                 list_del_init(&req->rq_list);
1575                 if (req->rq_export->exp_in_recovery) {
1576                         spin_lock(&req->rq_export->exp_lock);
1577                         req->rq_export->exp_in_recovery = 0;
1578                         spin_unlock(&req->rq_export->exp_lock);
1579                 }
1580         } else {
1581                 req = NULL;
1582         }
1583         spin_unlock_bh(&obd->obd_processing_task_lock);
1584         return req;
1585 }
1586
1587 static inline int req_vbr_done(struct obd_export *exp)
1588 {
1589         return (exp->exp_vbr_failed == 0);
1590 }
1591
1592 static inline int req_replay_done(struct obd_export *exp)
1593 {
1594         return (exp->exp_req_replay_needed == 0);
1595 }
1596
1597 static inline int lock_replay_done(struct obd_export *exp)
1598 {
1599         return (exp->exp_lock_replay_needed == 0);
1600 }
1601
1602 static inline int connect_done(struct obd_export *exp)
1603 {
1604         return (exp->exp_in_recovery != 0);
1605 }
1606
1607 static int check_for_clients(struct obd_device *obd)
1608 {
1609         if (obd->obd_abort_recovery || obd->obd_version_recov)
1610                 return 1;
1611         LASSERT(obd->obd_connected_clients <= obd->obd_max_recoverable_clients);
1612         if (obd->obd_no_conn == 0 &&
1613             obd->obd_connected_clients == obd->obd_max_recoverable_clients)
1614                 return 1;
1615         return 0;
1616 }
1617
1618 static int handle_recovery_req(struct ptlrpc_thread *thread,
1619                                struct ptlrpc_request *req,
1620                                svc_handler_t handler)
1621 {
1622         int rc;
1623         ENTRY;
1624
1625         rc = lu_context_init(&req->rq_session, LCT_SESSION);
1626         if (rc) {
1627                 CERROR("Failure to initialize session: %d\n", rc);
1628                 return rc;
1629         }
1630         req->rq_session.lc_thread = thread;
1631         lu_context_enter(&req->rq_session);
1632         req->rq_svc_thread = thread;
1633         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
1634
1635         /* thread context */
1636         lu_context_enter(&thread->t_env->le_ctx);
1637         (void)handler(req);
1638         lu_context_exit(&thread->t_env->le_ctx);
1639
1640         lu_context_exit(&req->rq_session);
1641         lu_context_fini(&req->rq_session);
1642         /* don't reset timer for final stage */
1643         if (!req_replay_done(req->rq_export) ||
1644             !lock_replay_done(req->rq_export))
1645                 reset_recovery_timer(class_exp2obd(req->rq_export),
1646                        AT_OFF ? obd_timeout :
1647                        at_get(&req->rq_rqbd->rqbd_service->srv_at_estimate), 1);
1648         ptlrpc_free_clone(req);
1649         RETURN(0);
1650 }
1651
1652 static int target_recovery_thread(void *arg)
1653 {
1654         struct lu_target *lut = arg;
1655         struct obd_device *obd = lut->lut_obd;
1656         struct ptlrpc_request *req;
1657         struct target_recovery_data *trd = &obd->obd_recovery_data;
1658         struct l_wait_info lwi = { 0 };
1659         unsigned long delta;
1660         unsigned long flags;
1661         struct lu_env env;
1662         struct ptlrpc_thread fake_svc_thread, *thread = &fake_svc_thread;
1663         int rc = 0;
1664         ENTRY;
1665
1666         cfs_daemonize("tgt_recov");
1667
1668         SIGNAL_MASK_LOCK(current, flags);
1669         sigfillset(&current->blocked);
1670         RECALC_SIGPENDING;
1671         SIGNAL_MASK_UNLOCK(current, flags);
1672
1673         rc = lu_context_init(&env.le_ctx, LCT_MD_THREAD);
1674         if (rc)
1675                 RETURN(rc);
1676
1677         thread->t_env = &env;
1678         env.le_ctx.lc_thread = thread;
1679
1680         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
1681                cfs_curproc_pid());
1682         trd->trd_processing_task = cfs_curproc_pid();
1683
1684         obd->obd_recovering = 1;
1685         complete(&trd->trd_starting);
1686
1687         /* first of all, we have to know the first transno to replay */
1688         obd->obd_abort_recovery = 0;
1689         l_wait_event(obd->obd_next_transno_waitq,
1690                      check_for_clients(obd), &lwi);
1691
1692         /* If some clients haven't connected in time, evict them */
1693         if (obd->obd_connected_clients < obd->obd_max_recoverable_clients) {
1694                 CWARN("Some clients haven't connect in time (%d/%d),"
1695                        "evict them\n", obd->obd_connected_clients,
1696                        obd->obd_max_recoverable_clients);
1697                 class_disconnect_stale_exports(obd, connect_done,
1698                                                exp_flags_from_obd(obd) |
1699                                                OBD_OPT_ABORT_RECOV);
1700                 /**
1701                  * if recovery proceeds with versions then some clients may be
1702                  * timed out waiting for others and trying to reconnect.
1703                  * Extend timer for such reconnect cases.
1704                  */
1705                 if (obd->obd_version_recov)
1706                         reset_recovery_timer(obd, RECONNECT_DELAY_MAX * 2, 1);
1707         }
1708
1709         /* next stage: replay requests */
1710         delta = jiffies;
1711         obd->obd_req_replaying = 1;
1712         CDEBUG(D_INFO, "1: request replay stage - %d clients from t"LPU64"\n",
1713                atomic_read(&obd->obd_req_replay_clients),
1714                obd->obd_next_recovery_transno);
1715         while ((req = target_next_replay_req(obd))) {
1716                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1717                 DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s",
1718                           lustre_msg_get_transno(req->rq_reqmsg),
1719                           libcfs_nid2str(req->rq_peer.nid));
1720                 handle_recovery_req(thread, req,
1721                                     trd->trd_recovery_handler);
1722                 obd->obd_replayed_requests++;
1723                 spin_lock_bh(&obd->obd_processing_task_lock);
1724                 obd->obd_next_recovery_transno++;
1725                 spin_unlock_bh(&obd->obd_processing_task_lock);
1726         }
1727
1728         /* If some clients haven't replayed requests in time, evict them */
1729         if (obd->obd_abort_recovery) {
1730                 CDEBUG(D_WARNING, "req replay is aborted\n");
1731                 class_disconnect_stale_exports(obd, req_replay_done,
1732                                                exp_flags_from_obd(obd) |
1733                                                OBD_OPT_ABORT_RECOV);
1734                 abort_req_replay_queue(obd);
1735         }
1736         LASSERT(list_empty(&obd->obd_req_replay_queue));
1737
1738         /* The second stage: replay locks */
1739         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
1740                atomic_read(&obd->obd_lock_replay_clients));
1741         while ((req = target_next_replay_lock(obd))) {
1742                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1743                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
1744                           libcfs_nid2str(req->rq_peer.nid));
1745                 handle_recovery_req(thread, req,
1746                                     trd->trd_recovery_handler);
1747                 obd->obd_replayed_locks++;
1748         }
1749
1750         /* If some clients haven't replayed requests in time, evict them */
1751         if (obd->obd_abort_recovery) {
1752                 CERROR("lock replay is aborted\n");
1753                 class_disconnect_stale_exports(obd, lock_replay_done,
1754                                                exp_flags_from_obd(obd) |
1755                                                OBD_OPT_ABORT_RECOV);
1756                 abort_lock_replay_queue(obd);
1757         }
1758         LASSERT(list_empty(&obd->obd_lock_replay_queue));
1759
1760         /* The third stage: reply on final pings */
1761         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
1762         /** evict exports failed VBR */
1763         class_disconnect_stale_exports(obd, req_vbr_done,
1764                                        exp_flags_from_obd(obd) |
1765                                        OBD_OPT_ABORT_RECOV);
1766         /** Update server last boot epoch */
1767         lut_boot_epoch_update(lut);
1768         /* We drop recoverying flag to forward all new requests
1769          * to regular mds_handle() since now */
1770         spin_lock_bh(&obd->obd_processing_task_lock);
1771         obd->obd_recovering = obd->obd_abort_recovery = 0;
1772         target_cancel_recovery_timer(obd);
1773         spin_unlock_bh(&obd->obd_processing_task_lock);
1774         while ((req = target_next_final_ping(obd))) {
1775                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1776                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
1777                           libcfs_nid2str(req->rq_peer.nid));
1778                 handle_recovery_req(thread, req,
1779                                     trd->trd_recovery_handler);
1780         }
1781
1782         delta = (jiffies - delta) / HZ;
1783         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
1784               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
1785         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
1786         LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
1787         if (delta > obd_timeout * OBD_RECOVERY_FACTOR) {
1788                 CWARN("too long recovery - read logs\n");
1789                 libcfs_debug_dumplog();
1790         }
1791
1792         target_finish_recovery(obd);
1793
1794         lu_context_fini(&env.le_ctx);
1795         trd->trd_processing_task = 0;
1796         complete(&trd->trd_finishing);
1797         RETURN(rc);
1798 }
1799
1800 static int target_start_recovery_thread(struct lu_target *lut,
1801                                         svc_handler_t handler)
1802 {
1803         struct obd_device *obd = lut->lut_obd;
1804         int rc = 0;
1805         struct target_recovery_data *trd = &obd->obd_recovery_data;
1806
1807         memset(trd, 0, sizeof(*trd));
1808         init_completion(&trd->trd_starting);
1809         init_completion(&trd->trd_finishing);
1810         trd->trd_recovery_handler = handler;
1811
1812         if (kernel_thread(target_recovery_thread, lut, 0) > 0) {
1813                 wait_for_completion(&trd->trd_starting);
1814                 LASSERT(obd->obd_recovering != 0);
1815         } else
1816                 rc = -ECHILD;
1817
1818         return rc;
1819 }
1820
1821 void target_stop_recovery_thread(struct obd_device *obd)
1822 {
1823         spin_lock_bh(&obd->obd_processing_task_lock);
1824         if (obd->obd_recovery_data.trd_processing_task > 0) {
1825                 struct target_recovery_data *trd = &obd->obd_recovery_data;
1826                 CERROR("%s: Aborting recovery\n", obd->obd_name);
1827                 obd->obd_abort_recovery = 1;
1828                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1829                 spin_unlock_bh(&obd->obd_processing_task_lock);
1830                 wait_for_completion(&trd->trd_finishing);
1831         } else {
1832                 spin_unlock_bh(&obd->obd_processing_task_lock);
1833         }
1834 }
1835
1836 void target_recovery_fini(struct obd_device *obd)
1837 {
1838         class_disconnect_exports(obd);
1839         target_stop_recovery_thread(obd);
1840         target_cleanup_recovery(obd);
1841 }
1842 EXPORT_SYMBOL(target_recovery_fini);
1843
1844 static void target_recovery_expired(unsigned long castmeharder)
1845 {
1846         struct obd_device *obd = (struct obd_device *)castmeharder;
1847         CDEBUG(D_HA, "%s: recovery timed out; %d clients never reconnected "
1848                "after %lds (%d clients did)\n",
1849                obd->obd_name, obd->obd_recoverable_clients,
1850                cfs_time_current_sec()- obd->obd_recovery_start,
1851                obd->obd_connected_clients);
1852
1853         spin_lock_bh(&obd->obd_processing_task_lock);
1854         obd->obd_version_recov = 1;
1855         CDEBUG(D_INFO, "VBR is used for %d clients from t"LPU64"\n",
1856                atomic_read(&obd->obd_req_replay_clients),
1857                obd->obd_next_recovery_transno);
1858         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1859         spin_unlock_bh(&obd->obd_processing_task_lock);
1860 }
1861
1862 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
1863 {
1864         struct obd_device *obd = lut->lut_obd;
1865         if (obd->obd_max_recoverable_clients == 0)
1866                 return;
1867
1868         CWARN("RECOVERY: service %s, %d recoverable clients, "
1869               "last_transno "LPU64"\n", obd->obd_name,
1870               obd->obd_max_recoverable_clients, obd->obd_last_committed);
1871         LASSERT(obd->obd_stopping == 0);
1872         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
1873         obd->obd_recovery_start = 0;
1874         obd->obd_recovery_end = 0;
1875         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1876         /* bz13079: this should be set to desired value for ost but not for mds */
1877         obd->obd_recovery_max_time = OBD_RECOVERY_MAX_TIME;
1878         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
1879         target_start_recovery_thread(lut, handler);
1880 }
1881 EXPORT_SYMBOL(target_recovery_init);
1882
1883 #endif
1884
1885 static int target_process_req_flags(struct obd_device *obd,
1886                                     struct ptlrpc_request *req)
1887 {
1888         struct obd_export *exp = req->rq_export;
1889         LASSERT(exp != NULL);
1890         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1891                 /* client declares he's ready to replay locks */
1892                 spin_lock_bh(&obd->obd_processing_task_lock);
1893                 if (exp->exp_req_replay_needed) {
1894                         LASSERT(atomic_read(&obd->obd_req_replay_clients) > 0);
1895                         spin_lock(&exp->exp_lock);
1896                         exp->exp_req_replay_needed = 0;
1897                         spin_unlock(&exp->exp_lock);
1898                         atomic_dec(&obd->obd_req_replay_clients);
1899                         LASSERT(obd->obd_recoverable_clients > 0);
1900                         obd->obd_recoverable_clients--;
1901                         if (atomic_read(&obd->obd_req_replay_clients) == 0)
1902                                 CDEBUG(D_HA, "all clients have replayed reqs\n");
1903                 }
1904                 spin_unlock_bh(&obd->obd_processing_task_lock);
1905         }
1906         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1907                 /* client declares he's ready to complete recovery
1908                  * so, we put the request on th final queue */
1909                 spin_lock_bh(&obd->obd_processing_task_lock);
1910                 if (exp->exp_lock_replay_needed) {
1911                         LASSERT(atomic_read(&obd->obd_lock_replay_clients) > 0);
1912                         spin_lock(&exp->exp_lock);
1913                         exp->exp_lock_replay_needed = 0;
1914                         spin_unlock(&exp->exp_lock);
1915                         atomic_dec(&obd->obd_lock_replay_clients);
1916                         if (atomic_read(&obd->obd_lock_replay_clients) == 0)
1917                                 CDEBUG(D_HA, "all clients have replayed locks\n");
1918                 }
1919                 spin_unlock_bh(&obd->obd_processing_task_lock);
1920         }
1921
1922         return 0;
1923 }
1924
1925 int target_queue_recovery_request(struct ptlrpc_request *req,
1926                                   struct obd_device *obd)
1927 {
1928         struct list_head *tmp;
1929         int inserted = 0;
1930         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1931         ENTRY;
1932
1933         if (obd->obd_recovery_data.trd_processing_task == cfs_curproc_pid()) {
1934                 /* Processing the queue right now, don't re-add. */
1935                 RETURN(1);
1936         }
1937
1938         target_process_req_flags(obd, req);
1939
1940         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1941                 /* client declares he's ready to complete recovery
1942                  * so, we put the request on th final queue */
1943                 req = ptlrpc_clone_req(req);
1944                 if (req == NULL)
1945                         RETURN(-ENOMEM);
1946                 DEBUG_REQ(D_HA, req, "queue final req");
1947                 spin_lock_bh(&obd->obd_processing_task_lock);
1948                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1949                 if (obd->obd_recovering)
1950                         list_add_tail(&req->rq_list, &obd->obd_final_req_queue);
1951                 else {
1952                         spin_unlock_bh(&obd->obd_processing_task_lock);
1953                         ptlrpc_free_clone(req);
1954                         if (obd->obd_stopping) {
1955                                 RETURN(-ENOTCONN);
1956                         } else {
1957                                 RETURN(1);
1958                         }
1959                 }
1960                 spin_unlock_bh(&obd->obd_processing_task_lock);
1961                 RETURN(0);
1962         }
1963         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1964                 /* client declares he's ready to replay locks */
1965                 req = ptlrpc_clone_req(req);
1966                 if (req == NULL)
1967                         RETURN(-ENOMEM);
1968                 DEBUG_REQ(D_HA, req, "queue lock replay req");
1969                 spin_lock_bh(&obd->obd_processing_task_lock);
1970                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1971                 LASSERT(obd->obd_recovering);
1972                 /* usually due to recovery abort */
1973                 if (!req->rq_export->exp_in_recovery) {
1974                         spin_unlock_bh(&obd->obd_processing_task_lock);
1975                         ptlrpc_free_clone(req);
1976                         RETURN(-ENOTCONN);
1977                 }
1978                 LASSERT(req->rq_export->exp_lock_replay_needed);
1979                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
1980                 spin_unlock_bh(&obd->obd_processing_task_lock);
1981                 RETURN(0);
1982         }
1983
1984         /* CAVEAT EMPTOR: The incoming request message has been swabbed
1985          * (i.e. buflens etc are in my own byte order), but type-dependent
1986          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
1987
1988         if (!transno) {
1989                 CFS_INIT_LIST_HEAD(&req->rq_list);
1990                 DEBUG_REQ(D_HA, req, "not queueing");
1991                 RETURN(1);
1992         }
1993
1994         spin_lock_bh(&obd->obd_processing_task_lock);
1995
1996         /* If we're processing the queue, we want don't want to queue this
1997          * message.
1998          *
1999          * Also, if this request has a transno less than the one we're waiting
2000          * for, we should process it now.  It could (and currently always will)
2001          * be an open request for a descriptor that was opened some time ago.
2002          *
2003          * Also, a resent, replayed request that has already been
2004          * handled will pass through here and be processed immediately.
2005          */
2006         CWARN("Next recovery transno: "LPU64", current: "LPU64", replaying: %i\n",
2007               obd->obd_next_recovery_transno, transno, obd->obd_req_replaying);
2008         if (transno < obd->obd_next_recovery_transno && obd->obd_req_replaying) {
2009                 /* Processing the queue right now, don't re-add. */
2010                 LASSERT(list_empty(&req->rq_list));
2011                 spin_unlock_bh(&obd->obd_processing_task_lock);
2012                 RETURN(1);
2013         }
2014         spin_unlock_bh(&obd->obd_processing_task_lock);
2015
2016         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2017                 RETURN(0);
2018
2019         req = ptlrpc_clone_req(req);
2020         if (req == NULL)
2021                 RETURN(-ENOMEM);
2022
2023         spin_lock_bh(&obd->obd_processing_task_lock);
2024         LASSERT(obd->obd_recovering);
2025         if (!req->rq_export->exp_in_recovery) {
2026                 spin_unlock_bh(&obd->obd_processing_task_lock);
2027                 ptlrpc_free_clone(req);
2028                 RETURN(-ENOTCONN);
2029         }
2030         LASSERT(req->rq_export->exp_req_replay_needed);
2031
2032         if (target_exp_enqueue_req_replay(req)) {
2033                 spin_unlock_bh(&obd->obd_processing_task_lock);
2034                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2035                 ptlrpc_free_clone(req);
2036                 RETURN(0);
2037         }
2038
2039         /* XXX O(n^2) */
2040         list_for_each(tmp, &obd->obd_req_replay_queue) {
2041                 struct ptlrpc_request *reqiter =
2042                         list_entry(tmp, struct ptlrpc_request, rq_list);
2043
2044                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2045                         list_add_tail(&req->rq_list, &reqiter->rq_list);
2046                         inserted = 1;
2047                         break;
2048                 }
2049
2050                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2051                              transno)) {
2052                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2053                                   "has been claimed by another client");
2054                         spin_unlock_bh(&obd->obd_processing_task_lock);
2055                         target_exp_dequeue_req_replay(req);
2056                         ptlrpc_free_clone(req);
2057                         RETURN(0);
2058                 }
2059         }
2060
2061         if (!inserted)
2062                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2063
2064         obd->obd_requests_queued_for_recovery++;
2065         cfs_waitq_signal(&obd->obd_next_transno_waitq);
2066         spin_unlock_bh(&obd->obd_processing_task_lock);
2067         RETURN(0);
2068 }
2069
2070 struct obd_device * target_req2obd(struct ptlrpc_request *req)
2071 {
2072         return req->rq_export->exp_obd;
2073 }
2074
2075 static inline struct ldlm_pool *ldlm_exp2pl(struct obd_export *exp)
2076 {
2077         LASSERT(exp != NULL);
2078         return &exp->exp_obd->obd_namespace->ns_pool;
2079 }
2080
2081 /**
2082  * Packs current SLV and Limit into \a req.
2083  */
2084 int target_pack_pool_reply(struct ptlrpc_request *req)
2085 {
2086         struct obd_device *obd;
2087         ENTRY;
2088
2089         /*
2090          * Check that we still have all structures alive as this may
2091          * be some late rpc in shutdown time.
2092          */
2093         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2094                      !exp_connect_lru_resize(req->rq_export))) {
2095                 lustre_msg_set_slv(req->rq_repmsg, 0);
2096                 lustre_msg_set_limit(req->rq_repmsg, 0);
2097                 RETURN(0);
2098         }
2099
2100         /*
2101          * OBD is alive here as export is alive, which we checked above.
2102          */
2103         obd = req->rq_export->exp_obd;
2104
2105         read_lock(&obd->obd_pool_lock);
2106         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2107         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2108         read_unlock(&obd->obd_pool_lock);
2109
2110         RETURN(0);
2111 }
2112
2113 int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
2114 {
2115         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2116                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2117                 return (-ECOMM);
2118         }
2119
2120         if (unlikely(rc)) {
2121                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
2122                 req->rq_status = rc;
2123                 return (ptlrpc_send_error(req, 1));
2124         } else {
2125                 DEBUG_REQ(D_NET, req, "sending reply");
2126         }
2127
2128         return (ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT));
2129 }
2130
2131 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2132 {
2133         int                        netrc;
2134         struct ptlrpc_reply_state *rs;
2135         struct obd_device         *obd;
2136         struct obd_export         *exp;
2137         struct ptlrpc_service     *svc;
2138         ENTRY;
2139
2140         if (req->rq_no_reply) {
2141                 EXIT;
2142                 return;
2143         }
2144
2145         svc = req->rq_rqbd->rqbd_service;
2146         rs = req->rq_reply_state;
2147         if (rs == NULL || !rs->rs_difficult) {
2148                 /* no notifiers */
2149                 target_send_reply_msg (req, rc, fail_id);
2150                 EXIT;
2151                 return;
2152         }
2153
2154         /* must be an export if locks saved */
2155         LASSERT (req->rq_export != NULL);
2156         /* req/reply consistent */
2157         LASSERT (rs->rs_service == svc);
2158
2159         /* "fresh" reply */
2160         LASSERT (!rs->rs_scheduled);
2161         LASSERT (!rs->rs_scheduled_ever);
2162         LASSERT (!rs->rs_handled);
2163         LASSERT (!rs->rs_on_net);
2164         LASSERT (rs->rs_export == NULL);
2165         LASSERT (list_empty(&rs->rs_obd_list));
2166         LASSERT (list_empty(&rs->rs_exp_list));
2167
2168         exp = class_export_get (req->rq_export);
2169         obd = exp->exp_obd;
2170
2171         /* disable reply scheduling onto srv_reply_queue while I'm setting up */
2172         rs->rs_scheduled = 1;
2173         rs->rs_on_net    = 1;
2174         rs->rs_xid       = req->rq_xid;
2175         rs->rs_transno   = req->rq_transno;
2176         rs->rs_export    = exp;
2177
2178         spin_lock(&exp->exp_uncommitted_replies_lock);
2179         CDEBUG(D_NET, "rs transno = "LPU64", last committed = "LPU64"\n",
2180                rs->rs_transno, exp->exp_last_committed);
2181         if (rs->rs_transno > exp->exp_last_committed) {
2182                 /* not committed already */
2183                 list_add_tail(&rs->rs_obd_list,
2184                               &exp->exp_uncommitted_replies);
2185         }
2186         spin_unlock (&exp->exp_uncommitted_replies_lock);
2187
2188         spin_lock(&exp->exp_lock);
2189         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
2190         spin_unlock(&exp->exp_lock);
2191
2192         netrc = target_send_reply_msg (req, rc, fail_id);
2193
2194         spin_lock(&svc->srv_lock);
2195
2196         atomic_inc(&svc->srv_n_difficult_replies);
2197
2198         if (netrc != 0) {
2199                 /* error sending: reply is off the net.  Also we need +1
2200                  * reply ref until ptlrpc_server_handle_reply() is done
2201                  * with the reply state (if the send was successful, there
2202                  * would have been +1 ref for the net, which
2203                  * reply_out_callback leaves alone) */
2204                 rs->rs_on_net = 0;
2205                 ptlrpc_rs_addref(rs);
2206                 atomic_inc (&svc->srv_outstanding_replies);
2207         }
2208
2209         spin_lock(&rs->rs_lock);
2210         if (rs->rs_transno <= exp->exp_last_committed ||
2211             (!rs->rs_on_net && !rs->rs_no_ack) ||
2212              list_empty(&rs->rs_exp_list) ||     /* completed already */
2213              list_empty(&rs->rs_obd_list)) {
2214                 CDEBUG(D_HA, "Schedule reply immediately\n");
2215                 ptlrpc_dispatch_difficult_reply(rs);
2216         } else {
2217                 list_add (&rs->rs_list, &svc->srv_active_replies);
2218                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
2219         }
2220         spin_unlock(&rs->rs_lock);
2221         spin_unlock(&svc->srv_lock);
2222         EXIT;
2223 }
2224
2225 int target_handle_ping(struct ptlrpc_request *req)
2226 {
2227         obd_ping(req->rq_export);
2228         return req_capsule_server_pack(&req->rq_pill);
2229 }
2230
2231 void target_committed_to_req(struct ptlrpc_request *req)
2232 {
2233         struct obd_export *exp = req->rq_export;
2234
2235         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2236                 lustre_msg_set_last_committed(req->rq_repmsg,
2237                                               exp->exp_last_committed);
2238         else
2239                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2240                           "%d)", exp->exp_obd->obd_no_transno,
2241                           req->rq_repmsg == NULL);
2242
2243         CDEBUG(D_INFO, "last_committed "LPU64", transno "LPU64", xid "LPU64"\n",
2244                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2245 }
2246 EXPORT_SYMBOL(target_committed_to_req);
2247
2248 int target_handle_qc_callback(struct ptlrpc_request *req)
2249 {
2250         struct obd_quotactl *oqctl;
2251         struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
2252
2253         oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2254         if (oqctl == NULL) {
2255                 CERROR("Can't unpack obd_quotactl\n");
2256                 RETURN(-EPROTO);
2257         }
2258
2259         cli->cl_qchk_stat = oqctl->qc_stat;
2260
2261         return 0;
2262 }
2263
2264 #ifdef HAVE_QUOTA_SUPPORT
2265 int target_handle_dqacq_callback(struct ptlrpc_request *req)
2266 {
2267 #ifdef __KERNEL__
2268         struct obd_device *obd = req->rq_export->exp_obd;
2269         struct obd_device *master_obd;
2270         struct obd_device_target *obt;
2271         struct lustre_quota_ctxt *qctxt;
2272         struct qunit_data *qdata = NULL;
2273         int rc = 0;
2274         ENTRY;
2275
2276         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_DROP_QUOTA_REQ))
2277                 RETURN(rc);
2278
2279         rc = req_capsule_server_pack(&req->rq_pill);
2280         if (rc) {
2281                 CERROR("packing reply failed!: rc = %d\n", rc);
2282                 RETURN(rc);
2283         }
2284
2285         LASSERT(req->rq_export);
2286
2287         OBD_ALLOC(qdata, sizeof(struct qunit_data));
2288         if (!qdata)
2289                 RETURN(-ENOMEM);
2290         rc = quota_get_qdata(req, qdata, QUOTA_REQUEST, QUOTA_EXPORT);
2291         if (rc < 0) {
2292                 CDEBUG(D_ERROR, "Can't unpack qunit_data(rc: %d)\n", rc);
2293                 GOTO(out, rc);
2294         }
2295
2296         /* we use the observer */
2297         if (!obd->obd_observer || !obd->obd_observer->obd_observer) {
2298                 CERROR("Can't find the observer, it is recovering\n");
2299                 req->rq_status = -EAGAIN;
2300                 GOTO(send_reply, rc = -EAGAIN);
2301         }
2302
2303         master_obd = obd->obd_observer->obd_observer;
2304         obt = &master_obd->u.obt;
2305         qctxt = &obt->obt_qctxt;
2306
2307         if (!qctxt->lqc_setup || !qctxt->lqc_valid) {
2308                 /* quota_type has not been processed yet, return EAGAIN
2309                  * until we know whether or not quotas are supposed to
2310                  * be enabled */
2311                 CDEBUG(D_QUOTA, "quota_type not processed yet, return "
2312                        "-EAGAIN\n");
2313                 req->rq_status = -EAGAIN;
2314                 rc = ptlrpc_reply(req);
2315                 GOTO(out, rc);
2316         }
2317
2318         down_read(&obt->obt_rwsem);
2319         if (qctxt->lqc_lqs_hash == NULL) {
2320                 up_read(&obt->obt_rwsem);
2321                 /* quota_type has not been processed yet, return EAGAIN
2322                  * until we know whether or not quotas are supposed to
2323                  * be enabled */
2324                 CDEBUG(D_QUOTA, "quota_ctxt is not ready yet, return "
2325                        "-EAGAIN\n");
2326                 req->rq_status = -EAGAIN;
2327                 rc = ptlrpc_reply(req);
2328                 GOTO(out, rc);
2329         }
2330
2331         LASSERT(qctxt->lqc_handler);
2332         rc = qctxt->lqc_handler(master_obd, qdata,
2333                                 lustre_msg_get_opc(req->rq_reqmsg));
2334         up_read(&obt->obt_rwsem);
2335         if (rc && rc != -EDQUOT)
2336                 CDEBUG(rc == -EBUSY  ? D_QUOTA : D_ERROR,
2337                        "dqacq failed! (rc:%d)\n", rc);
2338         req->rq_status = rc;
2339
2340         /* there are three forms of qunit(historic causes), so we need to
2341          * adjust the same form to different forms slaves needed */
2342         rc = quota_copy_qdata(req, qdata, QUOTA_REPLY, QUOTA_EXPORT);
2343         if (rc < 0) {
2344                 CDEBUG(D_ERROR, "Can't pack qunit_data(rc: %d)\n", rc);
2345                 GOTO(out, rc);
2346         }
2347
2348         /* Block the quota req. b=14840 */
2349         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_BLOCK_QUOTA_REQ, obd_timeout);
2350 send_reply:
2351         rc = ptlrpc_reply(req);
2352 out:
2353         OBD_FREE(qdata, sizeof(struct qunit_data));
2354         RETURN(rc);
2355 #else
2356         return 0;
2357 #endif /* !__KERNEL__ */
2358 }
2359 #endif /* HAVE_QUOTA_SUPPORT */
2360
2361 ldlm_mode_t lck_compat_array[] = {
2362         [LCK_EX] LCK_COMPAT_EX,
2363         [LCK_PW] LCK_COMPAT_PW,
2364         [LCK_PR] LCK_COMPAT_PR,
2365         [LCK_CW] LCK_COMPAT_CW,
2366         [LCK_CR] LCK_COMPAT_CR,
2367         [LCK_NL] LCK_COMPAT_NL,
2368         [LCK_GROUP] LCK_COMPAT_GROUP,
2369         [LCK_COS] LCK_COMPAT_COS,
2370 };
2371
2372 /**
2373  * Rather arbitrary mapping from LDLM error codes to errno values. This should
2374  * not escape to the user level.
2375  */
2376 int ldlm_error2errno(ldlm_error_t error)
2377 {
2378         int result;
2379
2380         switch (error) {
2381         case ELDLM_OK:
2382                 result = 0;
2383                 break;
2384         case ELDLM_LOCK_CHANGED:
2385                 result = -ESTALE;
2386                 break;
2387         case ELDLM_LOCK_ABORTED:
2388                 result = -ENAVAIL;
2389                 break;
2390         case ELDLM_LOCK_REPLACED:
2391                 result = -ESRCH;
2392                 break;
2393         case ELDLM_NO_LOCK_DATA:
2394                 result = -ENOENT;
2395                 break;
2396         case ELDLM_NAMESPACE_EXISTS:
2397                 result = -EEXIST;
2398                 break;
2399         case ELDLM_BAD_NAMESPACE:
2400                 result = -EBADF;
2401                 break;
2402         default:
2403                 if (((int)error) < 0)  /* cast to signed type */
2404                         result = error; /* as ldlm_error_t can be unsigned */
2405                 else {
2406                         CERROR("Invalid DLM result code: %i\n", error);
2407                         result = -EPROTO;
2408                 }
2409         }
2410         return result;
2411 }
2412 EXPORT_SYMBOL(ldlm_error2errno);
2413
2414 /**
2415  * Dual to ldlm_error2errno(): maps errno values back to ldlm_error_t.
2416  */
2417 ldlm_error_t ldlm_errno2error(int err_no)
2418 {
2419         int error;
2420
2421         switch (err_no) {
2422         case 0:
2423                 error = ELDLM_OK;
2424                 break;
2425         case -ESTALE:
2426                 error = ELDLM_LOCK_CHANGED;
2427                 break;
2428         case -ENAVAIL:
2429                 error = ELDLM_LOCK_ABORTED;
2430                 break;
2431         case -ESRCH:
2432                 error = ELDLM_LOCK_REPLACED;
2433                 break;
2434         case -ENOENT:
2435                 error = ELDLM_NO_LOCK_DATA;
2436                 break;
2437         case -EEXIST:
2438                 error = ELDLM_NAMESPACE_EXISTS;
2439                 break;
2440         case -EBADF:
2441                 error = ELDLM_BAD_NAMESPACE;
2442                 break;
2443         default:
2444                 error = err_no;
2445         }
2446         return error;
2447 }
2448 EXPORT_SYMBOL(ldlm_errno2error);
2449