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_deactive = 1;
 363                         spin_unlock(&imp->imp_lock);
 364                 }
 365         }
 366
 367         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 368                                                    LDLM_NAMESPACE_CLIENT,
 369                                                    LDLM_NAMESPACE_GREEDY);
 370         if (obddev->obd_namespace == NULL) {
 371                 CERROR("Unable to create client namespace - %s\n",
 372                        obddev->obd_name);
 373                 GOTO(err_import, rc = -ENOMEM);
 374         }
 375
 376         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 377
 378         RETURN(rc);
 379
 380 err_import:
 381         class_destroy_import(imp);
 382 err_ldlm:
 383         ldlm_put_ref();
 384 err:
 385         RETURN(rc);
 386
 387 }
 388
 389 int client_obd_cleanup(struct obd_device *obddev)
 390 {
 391         ENTRY;
 392
 393         ldlm_namespace_free_post(obddev->obd_namespace);
 394         obddev->obd_namespace = NULL;
 395
 396         ldlm_put_ref();
 397         RETURN(0);
 398 }
 399
 400 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 401 int client_connect_import(const struct lu_env *env,
 402                           struct obd_export **exp,
 403                           struct obd_device *obd, struct obd_uuid *cluuid,
 404                           struct obd_connect_data *data, void *localdata)
 405 {
 406         struct client_obd *cli = &obd->u.cli;
 407         struct obd_import *imp = cli->cl_import;
 408         struct obd_connect_data *ocd;
 409         struct lustre_handle conn = { 0 };
 410         int rc;
 411         ENTRY;
 412
 413         *exp = NULL;
 414         down_write(&cli->cl_sem);
 415         if (cli->cl_conn_count > 0 )
 416                 GOTO(out_sem, rc = -EALREADY);
 417
 418         rc = class_connect(&conn, obd, cluuid);
 419         if (rc)
 420                 GOTO(out_sem, rc);
 421
 422         cli->cl_conn_count++;
 423         *exp = class_conn2export(&conn);
 424
 425         LASSERT(obd->obd_namespace);
 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                 cli->cl_conn_count--;
 459                 class_disconnect(*exp);
 460                 *exp = NULL;
 461         }
 462 out_sem:
 463         up_write(&cli->cl_sem);
 464
 465         return rc;
 466 }
 467
 468 int client_disconnect_export(struct obd_export *exp)
 469 {
 470         struct obd_device *obd = class_exp2obd(exp);
 471         struct client_obd *cli;
 472         struct obd_import *imp;
 473         int rc = 0, err;
 474         ENTRY;
 475
 476         if (!obd) {
 477                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 478                        exp, exp ? exp->exp_handle.h_cookie : -1);
 479                 RETURN(-EINVAL);
 480         }
 481
 482         cli = &obd->u.cli;
 483         imp = cli->cl_import;
 484
 485         down_write(&cli->cl_sem);
 486         CDEBUG(D_INFO, "disconnect %s - %d\n", obd->obd_name,
 487                cli->cl_conn_count);
 488
 489         if (!cli->cl_conn_count) {
 490                 CERROR("disconnecting disconnected device (%s)\n",
 491                        obd->obd_name);
 492                 GOTO(out_disconnect, rc = -EINVAL);
 493         }
 494
 495         cli->cl_conn_count--;
 496         if (cli->cl_conn_count)
 497                 GOTO(out_disconnect, rc = 0);
 498
 499         /* Mark import deactivated now, so we don't try to reconnect if any
 500          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
 501          * fully deactivate the import, or that would drop all requests. */
 502         spin_lock(&imp->imp_lock);
 503         imp->imp_deactive = 1;
 504         spin_unlock(&imp->imp_lock);
 505
 506         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 507          * delete it regardless.  (It's safe to delete an import that was
 508          * never added.) */
 509         (void)ptlrpc_pinger_del_import(imp);
 510
 511         if (obd->obd_namespace != NULL) {
 512                 /* obd_force == local only */
 513                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 514                                        obd->obd_force ? LDLM_FL_LOCAL_ONLY:0,
 515                                        NULL);
 516                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 517         }
 518
 519         /*
 520          * there's no necessary to hold sem during diconnecting an import,
 521          * and actually it may cause deadlock in gss.
 522          */
 523         up_write(&cli->cl_sem);
 524         rc = ptlrpc_disconnect_import(imp, 0);
 525         down_write(&cli->cl_sem);
 526
 527         ptlrpc_invalidate_import(imp);
 528
 529         if (imp->imp_rq_pool) {
 530                 ptlrpc_free_rq_pool(imp->imp_rq_pool);
 531                 imp->imp_rq_pool = NULL;
 532         }
 533         client_destroy_import(imp);
 534         cli->cl_import = NULL;
 535
 536         EXIT;
 537
 538  out_disconnect:
 539         /* use server style - class_disconnect should be always called for
 540          * o_disconnect */
 541         err = class_disconnect(exp);
 542         if (!rc && err)
 543                 rc = err;
 544
 545         up_write(&cli->cl_sem);
 546
 547         RETURN(rc);
 548 }
 549
 550 /* --------------------------------------------------------------------------
 551  * from old lib/target.c
 552  * -------------------------------------------------------------------------- */
 553
 554 static int target_handle_reconnect(struct lustre_handle *conn,
 555                                    struct obd_export *exp,
 556                                    struct obd_uuid *cluuid)
 557 {
 558         ENTRY;
 559         if (exp->exp_connection && exp->exp_imp_reverse) {
 560                 struct lustre_handle *hdl;
 561                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 562                 /* Might be a re-connect after a partition. */
 563                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 564                         CWARN("%s: %s reconnecting\n", exp->exp_obd->obd_name,
 565                               cluuid->uuid);
 566                         conn->cookie = exp->exp_handle.h_cookie;
 567                         /* target_handle_connect() treats EALREADY and
 568                          * -EALREADY differently.  EALREADY means we are
 569                          * doing a valid reconnect from the same client. */
 570                         RETURN(EALREADY);
 571                 } else {
 572                         CERROR("%s reconnecting from %s, "
 573                                "handle mismatch (ours "LPX64", theirs "
 574                                LPX64")\n", cluuid->uuid,
 575                                exp->exp_connection->c_remote_uuid.uuid,
 576                                hdl->cookie, conn->cookie);
 577                         memset(conn, 0, sizeof *conn);
 578                         /* target_handle_connect() treats EALREADY and
 579                          * -EALREADY differently.  -EALREADY is an error
 580                          * (same UUID, different handle). */
 581                         RETURN(-EALREADY);
 582                 }
 583         }
 584
 585         conn->cookie = exp->exp_handle.h_cookie;
 586         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
 587                cluuid->uuid, exp, conn->cookie);
 588         RETURN(0);
 589 }
 590
 591 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
 592                           int error)
 593 {
 594         struct obd_export *exp = cb_data;
 595
 596         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 597                obd->obd_name, exp->exp_client_uuid.uuid);
 598
 599         spin_lock(&exp->exp_lock);
 600         exp->exp_need_sync = 0;
 601         spin_unlock(&exp->exp_lock);
 602 }
 603 EXPORT_SYMBOL(target_client_add_cb);
 604 static void
 605 target_start_and_reset_recovery_timer(struct obd_device *obd,
 606                                       struct ptlrpc_request *req,
 607                                       int new_client);
 608
 609 int target_handle_connect(struct ptlrpc_request *req)
 610 {
 611         struct obd_device *target, *targref = NULL;
 612         struct obd_export *export = NULL;
 613         struct obd_import *revimp;
 614         struct lustre_handle conn;
 615         struct lustre_handle *tmp;
 616         struct obd_uuid tgtuuid;
 617         struct obd_uuid cluuid;
 618         struct obd_uuid remote_uuid;
 619         char *str;
 620         int rc = 0;
 621         int mds_conn = 0;
 622         struct obd_connect_data *data, *tmpdata;
 623         lnet_nid_t *client_nid = NULL;
 624         ENTRY;
 625
 626         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 627
 628         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 629         if (str == NULL) {
 630                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 631                 GOTO(out, rc = -EINVAL);
 632         }
 633
 634         obd_str2uuid(&tgtuuid, str);
 635         target = class_uuid2obd(&tgtuuid);
 636         if (!target)
 637                 target = class_name2obd(str);
 638
 639         if (!target || target->obd_stopping || !target->obd_set_up) {
 640                 LCONSOLE_ERROR_MSG(0x137, "UUID '%s' is not available "
 641                                    " for connect (%s)\n", str,
 642                                    !target ? "no target" :
 643                                    (target->obd_stopping ? "stopping" :
 644                                    "not set up"));
 645                 GOTO(out, rc = -ENODEV);
 646         }
 647
 648         if (target->obd_no_conn) {
 649                 LCONSOLE_WARN("%s: temporarily refusing client connection "
 650                               "from %s\n", target->obd_name,
 651                               libcfs_nid2str(req->rq_peer.nid));
 652                 GOTO(out, rc = -EAGAIN);
 653         }
 654
 655         /* Make sure the target isn't cleaned up while we're here. Yes,
 656            there's still a race between the above check and our incref here.
 657            Really, class_uuid2obd should take the ref. */
 658         targref = class_incref(target, __FUNCTION__, cfs_current());
 659
 660
 661         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
 662         if (str == NULL) {
 663                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
 664                 GOTO(out, rc = -EINVAL);
 665         }
 666
 667         obd_str2uuid(&cluuid, str);
 668
 669         /* XXX extract a nettype and format accordingly */
 670         switch (sizeof(lnet_nid_t)) {
 671                 /* NB the casts only avoid compiler warnings */
 672         case 8:
 673                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 674                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
 675                 break;
 676         case 4:
 677                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 678                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
 679                 break;
 680         default:
 681                 LBUG();
 682         }
 683
 684         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 685         if (tmp == NULL)
 686                 GOTO(out, rc = -EPROTO);
 687
 688         conn = *tmp;
 689
 690         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 691         if (!data)
 692                 GOTO(out, rc = -EPROTO);
 693
 694         rc = req_capsule_server_pack(&req->rq_pill);
 695         if (rc)
 696                 GOTO(out, rc);
 697
 698         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 699                 if (!data) {
 700                         DEBUG_REQ(D_WARNING, req, "Refusing old (unversioned) "
 701                                   "libclient connection attempt");
 702                         GOTO(out, rc = -EPROTO);
 703                 } else if (data->ocd_version < LUSTRE_VERSION_CODE -
 704                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
 705                            data->ocd_version > LUSTRE_VERSION_CODE +
 706                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
 707                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
 708                                   "libclient connection attempt",
 709                                   data->ocd_version < LUSTRE_VERSION_CODE ?
 710                                   "old" : "new",
 711                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
 712                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
 713                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
 714                                   OBD_OCD_VERSION_FIX(data->ocd_version));
 715                         data = req_capsule_server_sized_get(&req->rq_pill,
 716                                                         &RMF_CONNECT_DATA,
 717                                     offsetof(typeof(*data), ocd_version) +
 718                                              sizeof(data->ocd_version));
 719                         if (data) {
 720                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
 721                                 data->ocd_version = LUSTRE_VERSION_CODE;
 722                         }
 723                         GOTO(out, rc = -EPROTO);
 724                 }
 725         }
 726
 727         if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) &&
 728             (data->ocd_connect_flags & OBD_CONNECT_MDS))
 729                 mds_conn = 1;
 730
 731         /* lctl gets a backstage, all-access pass. */
 732         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 733                 goto dont_check_exports;
 734
 735         export = lustre_hash_lookup(target->obd_uuid_hash, &cluuid);
 736         if (!export)
 737                 goto no_export;
 738
 739         /* we've found an export in the hash */
 740         if (export->exp_connecting) { /* bug 9635, et. al. */
 741                 CWARN("%s: exp %p already connecting\n",
 742                       export->exp_obd->obd_name, export);
 743                 class_export_put(export);
 744                 export = NULL;
 745                 rc = -EALREADY;
 746         } else if (mds_conn && export->exp_connection) {
 747                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid)
 748                         /* mds reconnected after failover */
 749                         CWARN("%s: received MDS connection from NID %s,"
 750                               " removing former export from NID %s\n",
 751                             target->obd_name, libcfs_nid2str(req->rq_peer.nid),
 752                             libcfs_nid2str(export->exp_connection->c_peer.nid));
 753                 else
 754                         /* new mds connection from the same nid */
 755                         CWARN("%s: received new MDS connection from NID %s,"
 756                               " removing former export from same NID\n",
 757                             target->obd_name, libcfs_nid2str(req->rq_peer.nid));
 758                 class_fail_export(export);
 759                 class_export_put(export);
 760                 export = NULL;
 761                 rc = 0;
 762         } else if (export->exp_connection != NULL &&
 763                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
 764                 /* in mds failover we have static uuid but nid can be
 765                  * changed*/
 766                 CWARN("%s: cookie %s seen on new NID %s when "
 767                       "existing NID %s is already connected\n",
 768                       target->obd_name, cluuid.uuid,
 769                       libcfs_nid2str(req->rq_peer.nid),
 770                       libcfs_nid2str(export->exp_connection->c_peer.nid));
 771                 rc = -EALREADY;
 772                 class_export_put(export);
 773                 export = NULL;
 774         } else {
 775                 spin_lock(&export->exp_lock);
 776                 export->exp_connecting = 1;
 777                 spin_unlock(&export->exp_lock);
 778                 class_export_put(export);
 779                 LASSERT(export->exp_obd == target);
 780
 781                 rc = target_handle_reconnect(&conn, export, &cluuid);
 782         }
 783
 784         /* If we found an export, we already unlocked. */
 785         if (!export) {
 786 no_export:
 787                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
 788         } else if (req->rq_export == NULL &&
 789                    atomic_read(&export->exp_rpc_count) > 0) {
 790                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
 791                       target->obd_name, cluuid.uuid,
 792                       libcfs_nid2str(req->rq_peer.nid),
 793                       export, atomic_read(&export->exp_refcount));
 794                 GOTO(out, rc = -EBUSY);
 795         } else if (req->rq_export != NULL &&
 796                    (atomic_read(&export->exp_rpc_count) > 1)) {
 797                 /* the current connect rpc has increased exp_rpc_count */
 798                 CWARN("%s: refuse reconnection 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_rpc_count) - 1);
 802                 spin_lock(&export->exp_lock);
 803                 if (req->rq_export->exp_conn_cnt <
 804                     lustre_msg_get_conn_cnt(req->rq_reqmsg))
 805                         /* try to abort active requests */
 806                         req->rq_export->exp_abort_active_req = 1;
 807                 spin_unlock(&export->exp_lock);
 808                 GOTO(out, rc = -EBUSY);
 809         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
 810                 CERROR("%s: NID %s (%s) reconnected with 1 conn_cnt; "
 811                        "cookies not random?\n", target->obd_name,
 812                        libcfs_nid2str(req->rq_peer.nid), cluuid.uuid);
 813                 GOTO(out, rc = -EALREADY);
 814         } else {
 815                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
 816         }
 817
 818         if (rc < 0) {
 819                 GOTO(out, rc);
 820         }
 821
 822         CWARN("%s: connection from %s@%s %st"LPU64" exp %p cur %ld last %ld\n",
 823                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 824               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
 825               export, (long)cfs_time_current_sec(),
 826               export ? (long)export->exp_last_request_time : 0);
 827
 828         /* Tell the client if we're in recovery. */
 829         if (target->obd_recovering) {
 830                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 831                 /* If this is the first time a client connects,
 832                    reset the recovery timer */
 833                 if (rc == 0)
 834                         target_start_and_reset_recovery_timer(target, req,
 835                                                               !export);
 836         }
 837
 838         /* We want to handle EALREADY but *not* -EALREADY from
 839          * target_handle_reconnect(), return reconnection state in a flag */
 840         if (rc == EALREADY) {
 841                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 842                 rc = 0;
 843         } else {
 844                 LASSERT(rc == 0);
 845         }
 846
 847         /* Tell the client if we support replayable requests */
 848         if (target->obd_replayable)
 849                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 850         client_nid = &req->rq_peer.nid;
 851
 852         if (export == NULL) {
 853                 if (target->obd_recovering) {
 854                         cfs_time_t t;
 855
 856                         t = cfs_timer_deadline(&target->obd_recovery_timer);
 857                         t = cfs_time_sub(t, cfs_time_current());
 858                         CERROR("%s: denying connection for new client %s (%s): "
 859                                "%d clients in recovery for "CFS_TIME_T"s\n",
 860                                target->obd_name,
 861                                libcfs_nid2str(req->rq_peer.nid), cluuid.uuid,
 862                                atomic_read(&target->obd_lock_replay_clients),
 863                                cfs_duration_sec(t));
 864                         rc = -EBUSY;
 865                 } else {
 866 dont_check_exports:
 867                         rc = obd_connect(req->rq_svc_thread->t_env,
 868                                          &export, target, &cluuid, data,
 869                                          client_nid);
 870                         if (rc == 0)
 871                                 conn.cookie = export->exp_handle.h_cookie;
 872                 }
 873         } else {
 874                 rc = obd_reconnect(req->rq_svc_thread->t_env,
 875                                    export, target, &cluuid, data, client_nid);
 876                 if (rc == 0)
 877                         /* prevous done via class_conn2export */
 878                         class_export_get(export);
 879         }
 880         if (rc)
 881                 GOTO(out, rc);
 882         /* Return only the parts of obd_connect_data that we understand, so the
 883          * client knows that we don't understand the rest. */
 884         if (data) {
 885                  tmpdata = req_capsule_server_get(&req->rq_pill,
 886                                                   &RMF_CONNECT_DATA);
 887                   //data->ocd_connect_flags &= OBD_CONNECT_SUPPORTED;
 888                  *tmpdata = *data;
 889         }
 890
 891         /* If all else goes well, this is our RPC return code. */
 892         req->rq_status = 0;
 893
 894         lustre_msg_set_handle(req->rq_repmsg, &conn);
 895
 896         /* If the client and the server are the same node, we will already
 897          * have an export that really points to the client's DLM export,
 898          * because we have a shared handles table.
 899          *
 900          * XXX this will go away when shaver stops sending the "connect" handle
 901          * in the real "remote handle" field of the request --phik 24 Apr 2003
 902          */
 903         if (req->rq_export != NULL)
 904                 class_export_put(req->rq_export);
 905
 906         req->rq_export = export;
 907
 908         spin_lock(&export->exp_lock);
 909         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
 910                 spin_unlock(&export->exp_lock);
 911                 CERROR("%s: %s already connected at higher conn_cnt: %d > %d\n",
 912                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 913                        export->exp_conn_cnt,
 914                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
 915
 916                 GOTO(out, rc = -EALREADY);
 917         }
 918         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
 919         export->exp_abort_active_req = 0;
 920
 921         /* request from liblustre?  Don't evict it for not pinging. */
 922         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 923                 export->exp_libclient = 1;
 924                 spin_unlock(&export->exp_lock);
 925
 926                 spin_lock(&target->obd_dev_lock);
 927                 list_del_init(&export->exp_obd_chain_timed);
 928                 spin_unlock(&target->obd_dev_lock);
 929         } else {
 930                 spin_unlock(&export->exp_lock);
 931         }
 932
 933         if (export->exp_connection != NULL)
 934                 ptlrpc_connection_put(export->exp_connection);
 935         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
 936                                                        req->rq_self,
 937                                                        &remote_uuid);
 938         if (hlist_unhashed(&export->exp_nid_hash)) {
 939                 lustre_hash_add_unique(export->exp_obd->obd_nid_hash,
 940                                        &export->exp_connection->c_peer.nid,
 941                                        &export->exp_nid_hash);
 942         }
 943
 944         spin_lock_bh(&target->obd_processing_task_lock);
 945         if (target->obd_recovering && !export->exp_in_recovery) {
 946                 spin_lock(&export->exp_lock);
 947                 export->exp_in_recovery = 1;
 948                 export->exp_req_replay_needed = 1;
 949                 export->exp_lock_replay_needed = 1;
 950                 spin_unlock(&export->exp_lock);
 951                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
 952                      && (data->ocd_transno == 0))
 953                         CWARN("Connect with zero transno!\n");
 954
 955                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
 956                      && data->ocd_transno < target->obd_next_recovery_transno)
 957                         target->obd_next_recovery_transno = data->ocd_transno;
 958                 target->obd_connected_clients++;
 959                 atomic_inc(&target->obd_req_replay_clients);
 960                 atomic_inc(&target->obd_lock_replay_clients);
 961                 if (target->obd_connected_clients ==
 962                     target->obd_max_recoverable_clients)
 963                         cfs_waitq_signal(&target->obd_next_transno_waitq);
 964         }
 965         spin_unlock_bh(&target->obd_processing_task_lock);
 966         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 967         conn = *tmp;
 968
 969         if (export->exp_imp_reverse != NULL) {
 970                 /* destroyed import can be still referenced in ctxt */
 971                 obd_set_info_async(export, sizeof(KEY_REVIMP_UPD),
 972                                    KEY_REVIMP_UPD, 0, NULL, NULL);
 973
 974                 /* in some recovery senarios, previous ctx init rpc handled
 975                  * in sptlrpc_target_export_check() might be used to install
 976                  * a reverse ctx in this reverse import, and later OBD_CONNECT
 977                  * using the same gss ctx could reach here and following new
 978                  * reverse import. note all reverse ctx in new/old import are
 979                  * actually based on the same gss ctx. so we invalidate ctx
 980                  * here before destroy import, otherwise flush old import will
 981                  * lead to remote reverse ctx be destroied, thus the reverse
 982                  * ctx of new import will lost its peer.
 983                  * there might be a better way to deal with this???
 984                  */
 985                 sptlrpc_import_inval_all_ctx(export->exp_imp_reverse);
 986
 987                 client_destroy_import(export->exp_imp_reverse);
 988         }
 989
 990         /* for the rest part, we return -ENOTCONN in case of errors
 991          * in order to let client initialize connection again.
 992          */
 993         revimp = export->exp_imp_reverse = class_new_import(target);
 994         if (!revimp) {
 995                 CERROR("fail to alloc new reverse import.\n");
 996                 GOTO(out, rc = -ENOTCONN);
 997         }
 998
 999         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
1000         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
1001         revimp->imp_remote_handle = conn;
1002         revimp->imp_dlm_fake = 1;
1003         revimp->imp_state = LUSTRE_IMP_FULL;
1004
1005         /* unknown versions will be caught in
1006          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
1007         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1008
1009         if ((export->exp_connect_flags & OBD_CONNECT_AT) &&
1010             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1011                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1012         else
1013                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1014
1015         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
1016         if (rc) {
1017                 CERROR("Failed to get sec for reverse import: %d\n", rc);
1018                 export->exp_imp_reverse = NULL;
1019                 class_destroy_import(revimp);
1020         }
1021
1022         class_import_put(revimp);
1023 out:
1024         if (export) {
1025                 spin_lock(&export->exp_lock);
1026                 export->exp_connecting = 0;
1027                 spin_unlock(&export->exp_lock);
1028         }
1029         if (targref)
1030                 class_decref(targref, __FUNCTION__, cfs_current());
1031         if (rc)
1032                 req->rq_status = rc;
1033         RETURN(rc);
1034 }
1035
1036 int target_handle_disconnect(struct ptlrpc_request *req)
1037 {
1038         int rc;
1039         ENTRY;
1040
1041         rc = req_capsule_server_pack(&req->rq_pill);
1042         if (rc)
1043                 RETURN(rc);
1044
1045         /* keep the rq_export around so we can send the reply */
1046         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1047
1048         RETURN(0);
1049 }
1050
1051 void target_destroy_export(struct obd_export *exp)
1052 {
1053         /* exports created from last_rcvd data, and "fake"
1054            exports created by lctl don't have an import */
1055         if (exp->exp_imp_reverse != NULL)
1056                 client_destroy_import(exp->exp_imp_reverse);
1057
1058         LASSERT(atomic_read(&exp->exp_locks_count) == 0);
1059         LASSERT(atomic_read(&exp->exp_rpc_count) == 0);
1060         LASSERT(atomic_read(&exp->exp_cb_count) == 0);
1061         LASSERT(atomic_read(&exp->exp_replay_count) == 0);
1062 }
1063
1064 /*
1065  * Recovery functions
1066  */
1067
1068 struct ptlrpc_request *ptlrpc_clone_req( struct ptlrpc_request *orig_req)
1069 {
1070         struct ptlrpc_request *copy_req;
1071         struct lustre_msg *copy_reqmsg;
1072         struct ptlrpc_user_desc *udesc = NULL;
1073
1074         OBD_ALLOC_PTR(copy_req);
1075         if (!copy_req)
1076                 return NULL;
1077         OBD_ALLOC(copy_reqmsg, orig_req->rq_reqlen);
1078         if (!copy_reqmsg){
1079                 OBD_FREE_PTR(copy_req);
1080                 return NULL;
1081         }
1082
1083         if (orig_req->rq_user_desc) {
1084                 int ngroups = orig_req->rq_user_desc->pud_ngroups;
1085
1086                 OBD_ALLOC(udesc, sptlrpc_user_desc_size(ngroups));
1087                 if (!udesc) {
1088                         OBD_FREE(copy_reqmsg, orig_req->rq_reqlen);
1089                         OBD_FREE_PTR(copy_req);
1090                         return NULL;
1091                 }
1092                 memcpy(udesc, orig_req->rq_user_desc,
1093                        sptlrpc_user_desc_size(ngroups));
1094         }
1095
1096         *copy_req = *orig_req;
1097         memcpy(copy_reqmsg, orig_req->rq_reqmsg, orig_req->rq_reqlen);
1098         copy_req->rq_reqmsg = copy_reqmsg;
1099         copy_req->rq_user_desc = udesc;
1100
1101         class_export_rpc_get(copy_req->rq_export);
1102         CFS_INIT_LIST_HEAD(&copy_req->rq_list);
1103         CFS_INIT_LIST_HEAD(&copy_req->rq_replay_list);
1104         sptlrpc_svc_ctx_addref(copy_req);
1105
1106         if (copy_req->rq_reply_state) {
1107                 /* the copied req takes over the reply state */
1108                 orig_req->rq_reply_state = NULL;
1109                 /* to catch further access */
1110                 orig_req->rq_repmsg = NULL;
1111                 orig_req->rq_replen = 0;
1112         }
1113         /** let export know it has replays to be handled */
1114         atomic_inc(&copy_req->rq_export->exp_replay_count);
1115         return copy_req;
1116 }
1117
1118 void ptlrpc_free_clone(struct ptlrpc_request *req)
1119 {
1120         LASSERT(list_empty(&req->rq_replay_list));
1121
1122         ptlrpc_req_drop_rs(req);
1123         sptlrpc_svc_ctx_decref(req);
1124         LASSERT(atomic_read(&req->rq_export->exp_replay_count) > 0);
1125         atomic_dec(&req->rq_export->exp_replay_count);
1126         class_export_rpc_put(req->rq_export);
1127         list_del_init(&req->rq_list);
1128
1129         if (req->rq_user_desc) {
1130                 int ngroups = req->rq_user_desc->pud_ngroups;
1131                 OBD_FREE(req->rq_user_desc, sptlrpc_user_desc_size(ngroups));
1132         }
1133         OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
1134         OBD_FREE_PTR(req);
1135 }
1136
1137 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1138 {
1139         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1140         struct obd_export     *exp = req->rq_export;
1141         struct ptlrpc_request *reqiter;
1142         int                    dup = 0;
1143
1144         LASSERT(exp);
1145
1146         spin_lock(&exp->exp_lock);
1147         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1148                             rq_replay_list) {
1149                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1150                         dup = 1;
1151                         break;
1152                 }
1153         }
1154
1155         if (dup) {
1156                 /* we expect it with RESENT and REPLAY flags */
1157                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1158                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1159                         CERROR("invalid flags %x of resent replay\n",
1160                                lustre_msg_get_flags(req->rq_reqmsg));
1161         } else {
1162                 list_add_tail(&req->rq_replay_list, &exp->exp_req_replay_queue);
1163         }
1164
1165         spin_unlock(&exp->exp_lock);
1166         return dup;
1167 }
1168
1169 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1170 {
1171         LASSERT(!list_empty(&req->rq_replay_list));
1172         LASSERT(req->rq_export);
1173
1174         spin_lock(&req->rq_export->exp_lock);
1175         list_del_init(&req->rq_replay_list);
1176         spin_unlock(&req->rq_export->exp_lock);
1177 }
1178
1179 #ifdef __KERNEL__
1180 static void target_finish_recovery(struct obd_device *obd)
1181 {
1182         ENTRY;
1183         LCONSOLE_INFO("%s: sending delayed replies to recovered clients\n",
1184                       obd->obd_name);
1185
1186         ldlm_reprocess_all_ns(obd->obd_namespace);
1187         spin_lock_bh(&obd->obd_processing_task_lock);
1188         if (list_empty(&obd->obd_req_replay_queue) &&
1189             list_empty(&obd->obd_lock_replay_queue) &&
1190             list_empty(&obd->obd_final_req_queue)) {
1191                 obd->obd_processing_task = 0;
1192         } else {
1193                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1194                        obd->obd_name,
1195                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1196                        list_empty(&obd->obd_lock_replay_queue) ? "" : "lock ",
1197                        list_empty(&obd->obd_final_req_queue) ? "" : "final ");
1198                 spin_unlock_bh(&obd->obd_processing_task_lock);
1199                 LBUG();
1200         }
1201         spin_unlock_bh(&obd->obd_processing_task_lock);
1202
1203         /* when recovery finished, cleanup orphans on mds and ost */
1204         if (OBT(obd) && OBP(obd, postrecov)) {
1205                 int rc = OBP(obd, postrecov)(obd);
1206                 if (rc < 0)
1207                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1208                                       obd->obd_name, rc);
1209         }
1210
1211         obd->obd_recovery_end = cfs_time_current_sec();
1212         EXIT;
1213 }
1214
1215 static void abort_req_replay_queue(struct obd_device *obd)
1216 {
1217         struct ptlrpc_request *req, *n;
1218         struct list_head abort_list;
1219
1220         CFS_INIT_LIST_HEAD(&abort_list);
1221         spin_lock_bh(&obd->obd_processing_task_lock);
1222         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1223         spin_unlock_bh(&obd->obd_processing_task_lock);
1224         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1225                 DEBUG_REQ(D_WARNING, req, "aborted:");
1226                 req->rq_status = -ENOTCONN;
1227                 if (ptlrpc_error(req)) {
1228                         DEBUG_REQ(D_ERROR, req,
1229                                   "failed abort_req_reply; skipping");
1230                 }
1231                 target_exp_dequeue_req_replay(req);
1232                 ptlrpc_free_clone(req);
1233         }
1234 }
1235
1236 static void abort_lock_replay_queue(struct obd_device *obd)
1237 {
1238         struct ptlrpc_request *req, *n;
1239         struct list_head abort_list;
1240
1241         CFS_INIT_LIST_HEAD(&abort_list);
1242         spin_lock_bh(&obd->obd_processing_task_lock);
1243         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1244         spin_unlock_bh(&obd->obd_processing_task_lock);
1245         list_for_each_entry_safe(req, n, &abort_list, rq_list){
1246                 DEBUG_REQ(D_ERROR, req, "aborted:");
1247                 req->rq_status = -ENOTCONN;
1248                 if (ptlrpc_error(req)) {
1249                         DEBUG_REQ(D_ERROR, req,
1250                                   "failed abort_lock_reply; skipping");
1251                 }
1252                 ptlrpc_free_clone(req);
1253         }
1254 }
1255 #endif
1256
1257 /* Called from a cleanup function if the device is being cleaned up
1258    forcefully.  The exports should all have been disconnected already,
1259    the only thing left to do is
1260      - clear the recovery flags
1261      - cancel the timer
1262      - free queued requests and replies, but don't send replies
1263    Because the obd_stopping flag is set, no new requests should be received.
1264
1265 */
1266 void target_cleanup_recovery(struct obd_device *obd)
1267 {
1268         struct ptlrpc_request *req, *n;
1269         struct list_head clean_list;
1270         ENTRY;
1271
1272         LASSERT(obd->obd_stopping);
1273
1274         CFS_INIT_LIST_HEAD(&clean_list);
1275         spin_lock_bh(&obd->obd_processing_task_lock);
1276         if (!obd->obd_recovering) {
1277                 spin_unlock_bh(&obd->obd_processing_task_lock);
1278                 EXIT;
1279                 return;
1280         }
1281         obd->obd_recovering = obd->obd_abort_recovery = 0;
1282         target_cancel_recovery_timer(obd);
1283
1284         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1285         spin_unlock_bh(&obd->obd_processing_task_lock);
1286
1287         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1288                 LASSERT(req->rq_reply_state == 0);
1289                 target_exp_dequeue_req_replay(req);
1290                 ptlrpc_free_clone(req);
1291         }
1292
1293         spin_lock_bh(&obd->obd_processing_task_lock);
1294         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1295         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1296         spin_unlock_bh(&obd->obd_processing_task_lock);
1297
1298         list_for_each_entry_safe(req, n, &clean_list, rq_list){
1299                 LASSERT(req->rq_reply_state == 0);
1300                 ptlrpc_free_clone(req);
1301         }
1302
1303         EXIT;
1304 }
1305
1306 /* obd_processing_task_lock should be held */
1307 void target_cancel_recovery_timer(struct obd_device *obd)
1308 {
1309         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1310         cfs_timer_disarm(&obd->obd_recovery_timer);
1311 }
1312
1313 /* extend = 1 means require at least "duration" seconds left in the timer,
1314    extend = 0 means set the total duration (start_recovery_timer) */
1315 static void reset_recovery_timer(struct obd_device *obd, int duration,
1316                                  int extend)
1317 {
1318         cfs_time_t now = cfs_time_current_sec();
1319         cfs_duration_t left;
1320
1321         spin_lock_bh(&obd->obd_processing_task_lock);
1322         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1323                 spin_unlock_bh(&obd->obd_processing_task_lock);
1324                 return;
1325         }
1326
1327         left = cfs_time_sub(obd->obd_recovery_end, now);
1328
1329         if (extend && (duration > left))
1330                 obd->obd_recovery_timeout += duration - left;
1331         else if (!extend && (duration > obd->obd_recovery_timeout))
1332                 /* Track the client's largest expected replay time */
1333                 obd->obd_recovery_timeout = duration;
1334 #ifdef CRAY_XT3
1335         /*
1336          * If total recovery time already exceed the
1337          * obd_recovery_max_time, then CRAY XT3 will
1338          * abort the recovery
1339          */
1340         if(obd->obd_recovery_timeout > obd->obd_recovery_max_time)
1341                 obd->obd_recovery_timeout = obd->obd_recovery_max_time;
1342 #endif
1343         obd->obd_recovery_end = obd->obd_recovery_start +
1344                                 obd->obd_recovery_timeout;
1345         if (!cfs_timer_is_armed(&obd->obd_recovery_timer) ||
1346             cfs_time_before(now, obd->obd_recovery_end)) {
1347                 left = cfs_time_sub(obd->obd_recovery_end, now);
1348                 cfs_timer_arm(&obd->obd_recovery_timer, cfs_time_shift(left));
1349         }
1350         spin_unlock_bh(&obd->obd_processing_task_lock);
1351         CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
1352                obd->obd_name, (unsigned)left);
1353 }
1354
1355 static void check_and_start_recovery_timer(struct obd_device *obd)
1356 {
1357         spin_lock_bh(&obd->obd_processing_task_lock);
1358         if (cfs_timer_is_armed(&obd->obd_recovery_timer)) {
1359                 spin_unlock_bh(&obd->obd_processing_task_lock);
1360                 return;
1361         }
1362         CDEBUG(D_HA, "%s: starting recovery timer\n", obd->obd_name);
1363         obd->obd_recovery_start = cfs_time_current_sec();
1364         /* minimum */
1365         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1366         spin_unlock_bh(&obd->obd_processing_task_lock);
1367
1368         reset_recovery_timer(obd, obd->obd_recovery_timeout, 0);
1369 }
1370
1371 /* Reset the timer with each new client connection */
1372 /*
1373  * This timer is actually reconnect_timer, which is for making sure
1374  * the total recovery window is at least as big as my reconnect
1375  * attempt timing. So the initial recovery time_out will be set to
1376  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1377  * from client is bigger than this, then the recovery time_out will
1378  * be extend to make sure the client could be reconnected, in the
1379  * process, the timeout from the new client should be ignored.
1380  */
1381
1382 static void
1383 target_start_and_reset_recovery_timer(struct obd_device *obd,
1384                                       struct ptlrpc_request *req,
1385                                       int new_client)
1386 {
1387         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1388
1389         if (!new_client && service_time)
1390                 /* Teach server about old server's estimates, as first guess
1391                  * at how long new requests will take. */
1392                 at_add(&req->rq_rqbd->rqbd_service->srv_at_estimate,
1393                        service_time);
1394
1395         check_and_start_recovery_timer(obd);
1396
1397         /* convert the service time to rpc timeout,
1398          * reuse service_time to limit stack usage */
1399         service_time = at_est2timeout(service_time);
1400
1401         /* We expect other clients to timeout within service_time, then try
1402          * to reconnect, then try the failover server.  The max delay between
1403          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL */
1404         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC +
1405                              INITIAL_CONNECT_TIMEOUT);
1406         if (service_time > obd->obd_recovery_timeout && !new_client)
1407                 reset_recovery_timer(obd, service_time, 0);
1408 }
1409
1410 #ifdef __KERNEL__
1411
1412 /** Health checking routines */
1413 static inline int exp_connect_healthy(struct obd_export *exp)
1414 {
1415         return (exp->exp_in_recovery);
1416 }
1417
1418 /** if export done req_replay or has replay in queue */
1419 static inline int exp_req_replay_healthy(struct obd_export *exp)
1420 {
1421         return (!exp->exp_req_replay_needed ||
1422                 atomic_read(&exp->exp_replay_count) > 0);
1423 }
1424 /** if export done lock_replay or has replay in queue */
1425 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1426 {
1427         return (!exp->exp_lock_replay_needed ||
1428                 atomic_read(&exp->exp_replay_count) > 0);
1429 }
1430
1431 static inline int exp_vbr_healthy(struct obd_export *exp)
1432 {
1433         return (!exp->exp_vbr_failed);
1434 }
1435
1436 static inline int exp_finished(struct obd_export *exp)
1437 {
1438         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1439 }
1440
1441 /** Checking routines for recovery */
1442 static int check_for_clients(struct obd_device *obd)
1443 {
1444         if (obd->obd_abort_recovery || obd->obd_recovery_expired)
1445                 return 1;
1446         LASSERT(obd->obd_connected_clients <= obd->obd_max_recoverable_clients);
1447         if (obd->obd_no_conn == 0 &&
1448             obd->obd_connected_clients + obd->obd_stale_clients ==
1449             obd->obd_max_recoverable_clients)
1450                 return 1;
1451         return 0;
1452 }
1453
1454 static int check_for_next_transno(struct obd_device *obd)
1455 {
1456         struct ptlrpc_request *req = NULL;
1457         int wake_up = 0, connected, completed, queue_len;
1458         __u64 next_transno, req_transno;
1459         ENTRY;
1460         spin_lock_bh(&obd->obd_processing_task_lock);
1461
1462         if (!list_empty(&obd->obd_req_replay_queue)) {
1463                 req = list_entry(obd->obd_req_replay_queue.next,
1464                                  struct ptlrpc_request, rq_list);
1465                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1466         } else {
1467                 req_transno = 0;
1468         }
1469
1470         connected = obd->obd_connected_clients;
1471         completed = connected - atomic_read(&obd->obd_req_replay_clients);
1472         queue_len = obd->obd_requests_queued_for_recovery;
1473         next_transno = obd->obd_next_recovery_transno;
1474
1475         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1476                "req_transno: "LPU64", next_transno: "LPU64"\n",
1477                obd->obd_max_recoverable_clients, connected, completed,
1478                queue_len, req_transno, next_transno);
1479
1480         if (obd->obd_abort_recovery) {
1481                 CDEBUG(D_HA, "waking for aborted recovery\n");
1482                 wake_up = 1;
1483         } else if (obd->obd_recovery_expired) {
1484                 CDEBUG(D_HA, "waking for expired recovery\n");
1485                 wake_up = 1;
1486         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1487                 CDEBUG(D_HA, "waking for completed recovery\n");
1488                 wake_up = 1;
1489         } else if (req_transno == next_transno) {
1490                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1491                 wake_up = 1;
1492         } else if (queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1493                 int d_lvl = D_HA;
1494                 /** handle gaps occured due to lost reply or VBR */
1495                 LASSERTF(req_transno >= next_transno,
1496                          "req_transno: "LPU64", next_transno: "LPU64"\n",
1497                          req_transno, next_transno);
1498                 if (req_transno > obd->obd_last_committed &&
1499                     !obd->obd_version_recov)
1500                         d_lvl = D_ERROR;
1501                 CDEBUG(d_lvl,
1502                        "%s: waking for gap in transno, VBR is %s (skip: "
1503                        LPD64", ql: %d, comp: %d, conn: %d, next: "LPD64
1504                        ", last_committed: "LPD64")\n",
1505                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1506                        next_transno, queue_len, completed, connected,
1507                        req_transno, obd->obd_last_committed);
1508                 obd->obd_next_recovery_transno = req_transno;
1509                 wake_up = 1;
1510         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1511                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1512                        " by fail_lock, waking up ("LPD64")\n", next_transno);
1513                 obd->obd_next_recovery_transno = req_transno;
1514                 wake_up = 1;
1515         }
1516         spin_unlock_bh(&obd->obd_processing_task_lock);
1517         return wake_up;
1518 }
1519
1520 static int check_for_next_lock(struct obd_device *obd)
1521 {
1522         int wake_up = 0;
1523
1524         spin_lock_bh(&obd->obd_processing_task_lock);
1525         if (!list_empty(&obd->obd_lock_replay_queue)) {
1526                 CDEBUG(D_HA, "waking for next lock\n");
1527                 wake_up = 1;
1528         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1529                 CDEBUG(D_HA, "waking for completed lock replay\n");
1530                 wake_up = 1;
1531         } else if (obd->obd_abort_recovery) {
1532                 CDEBUG(D_HA, "waking for aborted recovery\n");
1533                 wake_up = 1;
1534         } else if (obd->obd_recovery_expired) {
1535                 CDEBUG(D_HA, "waking for expired recovery\n");
1536                 wake_up = 1;
1537         }
1538         spin_unlock_bh(&obd->obd_processing_task_lock);
1539
1540         return wake_up;
1541 }
1542
1543 /**
1544  * wait for recovery events,
1545  * check its status with help of check_routine
1546  * evict dead clients via health_check
1547  */
1548 static int target_recovery_overseer(struct obd_device *obd,
1549                                     int (*check_routine)(struct obd_device *),
1550                                     int (*health_check)(struct obd_export *))
1551 {
1552         int abort = 0, expired = 1;
1553
1554         do {
1555                 cfs_wait_event(obd->obd_next_transno_waitq, check_routine(obd));
1556                 spin_lock_bh(&obd->obd_processing_task_lock);
1557                 abort = obd->obd_abort_recovery;
1558                 expired = obd->obd_recovery_expired;
1559                 obd->obd_recovery_expired = 0;
1560                 spin_unlock_bh(&obd->obd_processing_task_lock);
1561                 if (abort) {
1562                         CWARN("recovery is aborted, evict exports in recovery\n");
1563                         /** evict exports which didn't finish recovery yet */
1564                         class_disconnect_stale_exports(obd, exp_finished);
1565                 } else if (expired) {
1566                         /** If some clients died being recovered, evict them */
1567                         CDEBUG(D_WARNING, "recovery is timed out, evict stale exports\n");
1568                         /** evict cexports with no replay in queue, they are stalled */
1569                         class_disconnect_stale_exports(obd, health_check);
1570                         /** continue with VBR */
1571                         spin_lock_bh(&obd->obd_processing_task_lock);
1572                         obd->obd_version_recov = 1;
1573                         spin_unlock_bh(&obd->obd_processing_task_lock);
1574                         /**
1575                          * reset timer, recovery will proceed with versions now,
1576                          * timeout is set just to handle reconnection delays
1577                          */
1578                         reset_recovery_timer(obd, RECONNECT_DELAY_MAX * 2, 1);
1579                         /** Wait for recovery events again, after evicting bad clients */
1580                 }
1581         } while (!abort && expired);
1582
1583         return abort;
1584 }
1585
1586 static struct ptlrpc_request *target_next_replay_req(struct obd_device *obd)
1587 {
1588         struct ptlrpc_request *req = NULL;
1589         ENTRY;
1590
1591         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1592                obd->obd_next_recovery_transno);
1593
1594         if (target_recovery_overseer(obd, check_for_next_transno,
1595                                      exp_req_replay_healthy)) {
1596                 abort_req_replay_queue(obd);
1597                 abort_lock_replay_queue(obd);
1598         }
1599
1600         spin_lock_bh(&obd->obd_processing_task_lock);
1601         if (!list_empty(&obd->obd_req_replay_queue)) {
1602                 req = list_entry(obd->obd_req_replay_queue.next,
1603                                  struct ptlrpc_request, rq_list);
1604                 list_del_init(&req->rq_list);
1605                 obd->obd_requests_queued_for_recovery--;
1606                 spin_unlock_bh(&obd->obd_processing_task_lock);
1607         } else {
1608                 spin_unlock_bh(&obd->obd_processing_task_lock);
1609                 LASSERT(list_empty(&obd->obd_req_replay_queue));
1610                 LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
1611                 /** evict exports failed VBR */
1612                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1613         }
1614         RETURN(req);
1615 }
1616
1617 static struct ptlrpc_request *target_next_replay_lock(struct obd_device *obd)
1618 {
1619         struct ptlrpc_request *req = NULL;
1620
1621         CDEBUG(D_HA, "Waiting for lock\n");
1622         if (target_recovery_overseer(obd, check_for_next_lock,
1623                                      exp_lock_replay_healthy))
1624                 abort_lock_replay_queue(obd);
1625
1626         spin_lock_bh(&obd->obd_processing_task_lock);
1627         if (!list_empty(&obd->obd_lock_replay_queue)) {
1628                 req = list_entry(obd->obd_lock_replay_queue.next,
1629                                  struct ptlrpc_request, rq_list);
1630                 list_del_init(&req->rq_list);
1631                 spin_unlock_bh(&obd->obd_processing_task_lock);
1632         } else {
1633                 spin_unlock_bh(&obd->obd_processing_task_lock);
1634                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
1635                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
1636                 /** evict exports failed VBR */
1637                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1638         }
1639         return req;
1640 }
1641
1642 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
1643 {
1644         struct ptlrpc_request *req = NULL;
1645
1646         spin_lock_bh(&obd->obd_processing_task_lock);
1647         if (!list_empty(&obd->obd_final_req_queue)) {
1648                 req = list_entry(obd->obd_final_req_queue.next,
1649                                  struct ptlrpc_request, rq_list);
1650                 list_del_init(&req->rq_list);
1651                 if (req->rq_export->exp_in_recovery) {
1652                         spin_lock(&req->rq_export->exp_lock);
1653                         req->rq_export->exp_in_recovery = 0;
1654                         spin_unlock(&req->rq_export->exp_lock);
1655                 }
1656         }
1657         spin_unlock_bh(&obd->obd_processing_task_lock);
1658         return req;
1659 }
1660
1661 static int handle_recovery_req(struct ptlrpc_thread *thread,
1662                                struct ptlrpc_request *req,
1663                                svc_handler_t handler)
1664 {
1665         int rc;
1666         ENTRY;
1667
1668         rc = lu_context_init(&req->rq_session, LCT_SESSION);
1669         if (rc) {
1670                 CERROR("Failure to initialize session: %d\n", rc);
1671                 GOTO(free_clone, rc);
1672         }
1673         /**
1674          * export can be evicted during recovery, no need to handle replays for
1675          * it after that, discard such request silently
1676          */
1677         if (req->rq_export->exp_disconnected)
1678                 GOTO(free_clone, rc);
1679
1680         req->rq_session.lc_thread = thread;
1681         lu_context_enter(&req->rq_session);
1682         req->rq_svc_thread = thread;
1683         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
1684
1685         /* thread context */
1686         lu_context_enter(&thread->t_env->le_ctx);
1687         (void)handler(req);
1688         lu_context_exit(&thread->t_env->le_ctx);
1689
1690         lu_context_exit(&req->rq_session);
1691         lu_context_fini(&req->rq_session);
1692         /* don't reset timer for final stage */
1693         if (!exp_finished(req->rq_export))
1694                 reset_recovery_timer(class_exp2obd(req->rq_export),
1695                                      AT_OFF ? obd_timeout :
1696                        at_get(&req->rq_rqbd->rqbd_service->srv_at_estimate), 1);
1697
1698         /**
1699          * bz18031: increase next_recovery_transno before ptlrpc_free_clone()
1700          * will drop exp_rpc reference
1701          */
1702         if (req->rq_export->exp_req_replay_needed) {
1703                 spin_lock_bh(&req->rq_export->exp_obd->obd_processing_task_lock);
1704                 req->rq_export->exp_obd->obd_next_recovery_transno++;
1705                 spin_unlock_bh(&req->rq_export->exp_obd->obd_processing_task_lock);
1706                 target_exp_dequeue_req_replay(req);
1707         }
1708 free_clone:
1709         ptlrpc_free_clone(req);
1710         RETURN(0);
1711 }
1712
1713 static int target_recovery_thread(void *arg)
1714 {
1715         struct lu_target *lut = arg;
1716         struct obd_device *obd = lut->lut_obd;
1717         struct ptlrpc_request *req;
1718         struct target_recovery_data *trd = &obd->obd_recovery_data;
1719         unsigned long delta;
1720         unsigned long flags;
1721         struct lu_env env;
1722         struct ptlrpc_thread fake_svc_thread, *thread = &fake_svc_thread;
1723         int rc = 0;
1724         ENTRY;
1725
1726         cfs_daemonize("tgt_recov");
1727
1728         SIGNAL_MASK_LOCK(current, flags);
1729         sigfillset(&current->blocked);
1730         RECALC_SIGPENDING;
1731         SIGNAL_MASK_UNLOCK(current, flags);
1732
1733         rc = lu_context_init(&env.le_ctx, LCT_MD_THREAD);
1734         if (rc)
1735                 RETURN(rc);
1736
1737         thread->t_env = &env;
1738         env.le_ctx.lc_thread = thread;
1739
1740         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
1741                cfs_curproc_pid());
1742         trd->trd_processing_task = cfs_curproc_pid();
1743
1744         obd->obd_recovering = 1;
1745         complete(&trd->trd_starting);
1746
1747         /* first of all, we have to know the first transno to replay */
1748         if (target_recovery_overseer(obd, check_for_clients,
1749                                      exp_connect_healthy)) {
1750                 abort_req_replay_queue(obd);
1751                 abort_lock_replay_queue(obd);
1752         }
1753
1754         /* next stage: replay requests */
1755         delta = jiffies;
1756         obd->obd_req_replaying = 1;
1757         CDEBUG(D_INFO, "1: request replay stage - %d clients from t"LPU64"\n",
1758                atomic_read(&obd->obd_req_replay_clients),
1759                obd->obd_next_recovery_transno);
1760         while ((req = target_next_replay_req(obd))) {
1761                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1762                 DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s",
1763                           lustre_msg_get_transno(req->rq_reqmsg),
1764                           libcfs_nid2str(req->rq_peer.nid));
1765                 handle_recovery_req(thread, req,
1766                                     trd->trd_recovery_handler);
1767                 obd->obd_replayed_requests++;
1768         }
1769
1770         /**
1771          * The second stage: replay locks
1772          */
1773         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
1774                atomic_read(&obd->obd_lock_replay_clients));
1775         while ((req = target_next_replay_lock(obd))) {
1776                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1777                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
1778                           libcfs_nid2str(req->rq_peer.nid));
1779                 handle_recovery_req(thread, req,
1780                                     trd->trd_recovery_handler);
1781                 obd->obd_replayed_locks++;
1782         }
1783
1784         /**
1785          * The third stage: reply on final pings, at this moment all clients
1786          * must have request in final queue
1787          */
1788         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
1789         /** Update server last boot epoch */
1790         lut_boot_epoch_update(lut);
1791         /* We drop recoverying flag to forward all new requests
1792          * to regular mds_handle() since now */
1793         spin_lock_bh(&obd->obd_processing_task_lock);
1794         obd->obd_recovering = obd->obd_abort_recovery = 0;
1795         target_cancel_recovery_timer(obd);
1796         spin_unlock_bh(&obd->obd_processing_task_lock);
1797         while ((req = target_next_final_ping(obd))) {
1798                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1799                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
1800                           libcfs_nid2str(req->rq_peer.nid));
1801                 handle_recovery_req(thread, req,
1802                                     trd->trd_recovery_handler);
1803         }
1804
1805         delta = (jiffies - delta) / HZ;
1806         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
1807               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
1808         if (delta > obd_timeout * OBD_RECOVERY_FACTOR) {
1809                 CWARN("too long recovery - read logs\n");
1810                 libcfs_debug_dumplog();
1811         }
1812
1813         target_finish_recovery(obd);
1814
1815         lu_context_fini(&env.le_ctx);
1816         trd->trd_processing_task = 0;
1817         complete(&trd->trd_finishing);
1818         RETURN(rc);
1819 }
1820
1821 static int target_start_recovery_thread(struct lu_target *lut,
1822                                         svc_handler_t handler)
1823 {
1824         struct obd_device *obd = lut->lut_obd;
1825         int rc = 0;
1826         struct target_recovery_data *trd = &obd->obd_recovery_data;
1827
1828         memset(trd, 0, sizeof(*trd));
1829         init_completion(&trd->trd_starting);
1830         init_completion(&trd->trd_finishing);
1831         trd->trd_recovery_handler = handler;
1832
1833         if (kernel_thread(target_recovery_thread, lut, 0) > 0) {
1834                 wait_for_completion(&trd->trd_starting);
1835                 LASSERT(obd->obd_recovering != 0);
1836         } else
1837                 rc = -ECHILD;
1838
1839         return rc;
1840 }
1841
1842 void target_stop_recovery_thread(struct obd_device *obd)
1843 {
1844         spin_lock_bh(&obd->obd_processing_task_lock);
1845         if (obd->obd_recovery_data.trd_processing_task > 0) {
1846                 struct target_recovery_data *trd = &obd->obd_recovery_data;
1847                 CERROR("%s: Aborting recovery\n", obd->obd_name);
1848                 obd->obd_abort_recovery = 1;
1849                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1850                 spin_unlock_bh(&obd->obd_processing_task_lock);
1851                 wait_for_completion(&trd->trd_finishing);
1852         } else {
1853                 spin_unlock_bh(&obd->obd_processing_task_lock);
1854         }
1855 }
1856
1857 void target_recovery_fini(struct obd_device *obd)
1858 {
1859         class_disconnect_exports(obd);
1860         target_stop_recovery_thread(obd);
1861         target_cleanup_recovery(obd);
1862 }
1863 EXPORT_SYMBOL(target_recovery_fini);
1864
1865 static void target_recovery_expired(unsigned long castmeharder)
1866 {
1867         struct obd_device *obd = (struct obd_device *)castmeharder;
1868         CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
1869                " after %lds (%d clients connected)\n",
1870                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
1871                cfs_time_current_sec()- obd->obd_recovery_start,
1872                obd->obd_connected_clients);
1873
1874         spin_lock_bh(&obd->obd_processing_task_lock);
1875         obd->obd_recovery_expired = 1;
1876         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1877         spin_unlock_bh(&obd->obd_processing_task_lock);
1878 }
1879
1880 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
1881 {
1882         struct obd_device *obd = lut->lut_obd;
1883         if (obd->obd_max_recoverable_clients == 0) {
1884                 /** Update server last boot epoch */
1885                 lut_boot_epoch_update(lut);
1886                 return;
1887         }
1888
1889         CWARN("RECOVERY: service %s, %d recoverable clients, "
1890               "last_transno "LPU64"\n", obd->obd_name,
1891               obd->obd_max_recoverable_clients, obd->obd_last_committed);
1892         LASSERT(obd->obd_stopping == 0);
1893         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
1894         obd->obd_recovery_start = 0;
1895         obd->obd_recovery_end = 0;
1896         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1897         /* bz13079: this should be set to desired value for ost but not for mds */
1898         obd->obd_recovery_max_time = OBD_RECOVERY_MAX_TIME;
1899         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
1900         target_start_recovery_thread(lut, handler);
1901 }
1902 EXPORT_SYMBOL(target_recovery_init);
1903
1904 #endif
1905
1906 static int target_process_req_flags(struct obd_device *obd,
1907                                     struct ptlrpc_request *req)
1908 {
1909         struct obd_export *exp = req->rq_export;
1910         LASSERT(exp != NULL);
1911         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1912                 /* client declares he's ready to replay locks */
1913                 spin_lock_bh(&obd->obd_processing_task_lock);
1914                 if (exp->exp_req_replay_needed) {
1915                         LASSERT(atomic_read(&obd->obd_req_replay_clients) > 0);
1916                         spin_lock(&exp->exp_lock);
1917                         exp->exp_req_replay_needed = 0;
1918                         spin_unlock(&exp->exp_lock);
1919                         atomic_dec(&obd->obd_req_replay_clients);
1920                 }
1921                 spin_unlock_bh(&obd->obd_processing_task_lock);
1922         }
1923         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1924                 /* client declares he's ready to complete recovery
1925                  * so, we put the request on th final queue */
1926                 spin_lock_bh(&obd->obd_processing_task_lock);
1927                 if (exp->exp_lock_replay_needed) {
1928                         LASSERT(atomic_read(&obd->obd_lock_replay_clients) > 0);
1929                         spin_lock(&exp->exp_lock);
1930                         exp->exp_lock_replay_needed = 0;
1931                         spin_unlock(&exp->exp_lock);
1932                         atomic_dec(&obd->obd_lock_replay_clients);
1933                 }
1934                 spin_unlock_bh(&obd->obd_processing_task_lock);
1935         }
1936
1937         return 0;
1938 }
1939
1940 int target_queue_recovery_request(struct ptlrpc_request *req,
1941                                   struct obd_device *obd)
1942 {
1943         struct list_head *tmp;
1944         int inserted = 0;
1945         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1946         ENTRY;
1947
1948         if (obd->obd_recovery_data.trd_processing_task == cfs_curproc_pid()) {
1949                 /* Processing the queue right now, don't re-add. */
1950                 RETURN(1);
1951         }
1952
1953         target_process_req_flags(obd, req);
1954
1955         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1956                 /* client declares he's ready to complete recovery
1957                  * so, we put the request on th final queue */
1958                 req = ptlrpc_clone_req(req);
1959                 if (req == NULL)
1960                         RETURN(-ENOMEM);
1961                 DEBUG_REQ(D_HA, req, "queue final req");
1962                 spin_lock_bh(&obd->obd_processing_task_lock);
1963                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1964                 if (obd->obd_recovering)
1965                         list_add_tail(&req->rq_list, &obd->obd_final_req_queue);
1966                 else {
1967                         spin_unlock_bh(&obd->obd_processing_task_lock);
1968                         ptlrpc_free_clone(req);
1969                         if (obd->obd_stopping) {
1970                                 RETURN(-ENOTCONN);
1971                         } else {
1972                                 RETURN(1);
1973                         }
1974                 }
1975                 spin_unlock_bh(&obd->obd_processing_task_lock);
1976                 RETURN(0);
1977         }
1978         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1979                 /* client declares he's ready to replay locks */
1980                 req = ptlrpc_clone_req(req);
1981                 if (req == NULL)
1982                         RETURN(-ENOMEM);
1983                 DEBUG_REQ(D_HA, req, "queue lock replay req");
1984                 spin_lock_bh(&obd->obd_processing_task_lock);
1985                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1986                 LASSERT(obd->obd_recovering);
1987                 /* usually due to recovery abort */
1988                 if (!req->rq_export->exp_in_recovery) {
1989                         spin_unlock_bh(&obd->obd_processing_task_lock);
1990                         ptlrpc_free_clone(req);
1991                         RETURN(-ENOTCONN);
1992                 }
1993                 LASSERT(req->rq_export->exp_lock_replay_needed);
1994                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
1995                 spin_unlock_bh(&obd->obd_processing_task_lock);
1996                 RETURN(0);
1997         }
1998
1999         /* CAVEAT EMPTOR: The incoming request message has been swabbed
2000          * (i.e. buflens etc are in my own byte order), but type-dependent
2001          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
2002
2003         if (!transno) {
2004                 CFS_INIT_LIST_HEAD(&req->rq_list);
2005                 DEBUG_REQ(D_HA, req, "not queueing");
2006                 RETURN(1);
2007         }
2008
2009         spin_lock_bh(&obd->obd_processing_task_lock);
2010
2011         /* If we're processing the queue, we want don't want to queue this
2012          * message.
2013          *
2014          * Also, if this request has a transno less than the one we're waiting
2015          * for, we should process it now.  It could (and currently always will)
2016          * be an open request for a descriptor that was opened some time ago.
2017          *
2018          * Also, a resent, replayed request that has already been
2019          * handled will pass through here and be processed immediately.
2020          */
2021         CWARN("Next recovery transno: "LPU64", current: "LPU64", replaying: %i\n",
2022               obd->obd_next_recovery_transno, transno, obd->obd_req_replaying);
2023         if (transno < obd->obd_next_recovery_transno && obd->obd_req_replaying) {
2024                 /* Processing the queue right now, don't re-add. */
2025                 LASSERT(list_empty(&req->rq_list));
2026                 spin_unlock_bh(&obd->obd_processing_task_lock);
2027                 RETURN(1);
2028         }
2029         spin_unlock_bh(&obd->obd_processing_task_lock);
2030
2031         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2032                 RETURN(0);
2033
2034         req = ptlrpc_clone_req(req);
2035         if (req == NULL)
2036                 RETURN(-ENOMEM);
2037
2038         spin_lock_bh(&obd->obd_processing_task_lock);
2039         LASSERT(obd->obd_recovering);
2040         if (!req->rq_export->exp_in_recovery) {
2041                 spin_unlock_bh(&obd->obd_processing_task_lock);
2042                 ptlrpc_free_clone(req);
2043                 RETURN(-ENOTCONN);
2044         }
2045         LASSERT(req->rq_export->exp_req_replay_needed);
2046
2047         if (target_exp_enqueue_req_replay(req)) {
2048                 spin_unlock_bh(&obd->obd_processing_task_lock);
2049                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2050                 ptlrpc_free_clone(req);
2051                 RETURN(0);
2052         }
2053
2054         /* XXX O(n^2) */
2055         list_for_each(tmp, &obd->obd_req_replay_queue) {
2056                 struct ptlrpc_request *reqiter =
2057                         list_entry(tmp, struct ptlrpc_request, rq_list);
2058
2059                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2060                         list_add_tail(&req->rq_list, &reqiter->rq_list);
2061                         inserted = 1;
2062                         break;
2063                 }
2064
2065                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2066                              transno)) {
2067                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2068                                   "has been claimed by another client");
2069                         spin_unlock_bh(&obd->obd_processing_task_lock);
2070                         target_exp_dequeue_req_replay(req);
2071                         ptlrpc_free_clone(req);
2072                         RETURN(0);
2073                 }
2074         }
2075
2076         if (!inserted)
2077                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2078
2079         obd->obd_requests_queued_for_recovery++;
2080         cfs_waitq_signal(&obd->obd_next_transno_waitq);
2081         spin_unlock_bh(&obd->obd_processing_task_lock);
2082         RETURN(0);
2083 }
2084
2085 /**
2086  * Packs current SLV and Limit into \a req.
2087  */
2088 int target_pack_pool_reply(struct ptlrpc_request *req)
2089 {
2090         struct obd_device *obd;
2091         ENTRY;
2092
2093         /*
2094          * Check that we still have all structures alive as this may
2095          * be some late rpc in shutdown time.
2096          */
2097         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2098                      !exp_connect_lru_resize(req->rq_export))) {
2099                 lustre_msg_set_slv(req->rq_repmsg, 0);
2100                 lustre_msg_set_limit(req->rq_repmsg, 0);
2101                 RETURN(0);
2102         }
2103
2104         /*
2105          * OBD is alive here as export is alive, which we checked above.
2106          */
2107         obd = req->rq_export->exp_obd;
2108
2109         read_lock(&obd->obd_pool_lock);
2110         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2111         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2112         read_unlock(&obd->obd_pool_lock);
2113
2114         RETURN(0);
2115 }
2116
2117 int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
2118 {
2119         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2120                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2121                 return (-ECOMM);
2122         }
2123
2124         if (unlikely(rc)) {
2125                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
2126                 req->rq_status = rc;
2127                 return (ptlrpc_send_error(req, 1));
2128         } else {
2129                 DEBUG_REQ(D_NET, req, "sending reply");
2130         }
2131
2132         return (ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT));
2133 }
2134
2135 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2136 {
2137         int                        netrc;
2138         struct ptlrpc_reply_state *rs;
2139         struct obd_device         *obd;
2140         struct obd_export         *exp;
2141         struct ptlrpc_service     *svc;
2142         ENTRY;
2143
2144         if (req->rq_no_reply) {
2145                 EXIT;
2146                 return;
2147         }
2148
2149         svc = req->rq_rqbd->rqbd_service;
2150         rs = req->rq_reply_state;
2151         if (rs == NULL || !rs->rs_difficult) {
2152                 /* no notifiers */
2153                 target_send_reply_msg (req, rc, fail_id);
2154                 EXIT;
2155                 return;
2156         }
2157
2158         /* must be an export if locks saved */
2159         LASSERT (req->rq_export != NULL);
2160         /* req/reply consistent */
2161         LASSERT (rs->rs_service == svc);
2162
2163         /* "fresh" reply */
2164         LASSERT (!rs->rs_scheduled);
2165         LASSERT (!rs->rs_scheduled_ever);
2166         LASSERT (!rs->rs_handled);
2167         LASSERT (!rs->rs_on_net);
2168         LASSERT (rs->rs_export == NULL);
2169         LASSERT (list_empty(&rs->rs_obd_list));
2170         LASSERT (list_empty(&rs->rs_exp_list));
2171
2172         exp = class_export_get (req->rq_export);
2173         obd = exp->exp_obd;
2174
2175         /* disable reply scheduling onto srv_reply_queue while I'm setting up */
2176         rs->rs_scheduled = 1;
2177         rs->rs_on_net    = 1;
2178         rs->rs_xid       = req->rq_xid;
2179         rs->rs_transno   = req->rq_transno;
2180         rs->rs_export    = exp;
2181         rs->rs_opc       = lustre_msg_get_opc(rs->rs_msg);
2182
2183         spin_lock(&exp->exp_uncommitted_replies_lock);
2184         CDEBUG(D_NET, "rs transno = "LPU64", last committed = "LPU64"\n",
2185                rs->rs_transno, exp->exp_last_committed);
2186         if (rs->rs_transno > exp->exp_last_committed) {
2187                 /* not committed already */
2188                 list_add_tail(&rs->rs_obd_list,
2189                               &exp->exp_uncommitted_replies);
2190         }
2191         spin_unlock (&exp->exp_uncommitted_replies_lock);
2192
2193         spin_lock(&exp->exp_lock);
2194         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
2195         spin_unlock(&exp->exp_lock);
2196
2197         netrc = target_send_reply_msg (req, rc, fail_id);
2198
2199         spin_lock(&svc->srv_lock);
2200
2201         atomic_inc(&svc->srv_n_difficult_replies);
2202
2203         if (netrc != 0) {
2204                 /* error sending: reply is off the net.  Also we need +1
2205                  * reply ref until ptlrpc_server_handle_reply() is done
2206                  * with the reply state (if the send was successful, there
2207                  * would have been +1 ref for the net, which
2208                  * reply_out_callback leaves alone) */
2209                 rs->rs_on_net = 0;
2210                 ptlrpc_rs_addref(rs);
2211                 atomic_inc (&svc->srv_outstanding_replies);
2212         }
2213
2214         spin_lock(&rs->rs_lock);
2215         if (rs->rs_transno <= exp->exp_last_committed ||
2216             (!rs->rs_on_net && !rs->rs_no_ack) ||
2217              list_empty(&rs->rs_exp_list) ||     /* completed already */
2218              list_empty(&rs->rs_obd_list)) {
2219                 CDEBUG(D_HA, "Schedule reply immediately\n");
2220                 ptlrpc_dispatch_difficult_reply(rs);
2221         } else {
2222                 list_add (&rs->rs_list, &svc->srv_active_replies);
2223                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
2224         }
2225         spin_unlock(&rs->rs_lock);
2226         spin_unlock(&svc->srv_lock);
2227         EXIT;
2228 }
2229
2230 int target_handle_ping(struct ptlrpc_request *req)
2231 {
2232         obd_ping(req->rq_export);
2233         return req_capsule_server_pack(&req->rq_pill);
2234 }
2235
2236 void target_committed_to_req(struct ptlrpc_request *req)
2237 {
2238         struct obd_export *exp = req->rq_export;
2239
2240         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2241                 lustre_msg_set_last_committed(req->rq_repmsg,
2242                                               exp->exp_last_committed);
2243         else
2244                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2245                           "%d)", exp->exp_obd->obd_no_transno,
2246                           req->rq_repmsg == NULL);
2247
2248         CDEBUG(D_INFO, "last_committed "LPU64", transno "LPU64", xid "LPU64"\n",
2249                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2250 }
2251 EXPORT_SYMBOL(target_committed_to_req);
2252
2253 int target_handle_qc_callback(struct ptlrpc_request *req)
2254 {
2255         struct obd_quotactl *oqctl;
2256         struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
2257
2258         oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2259         if (oqctl == NULL) {
2260                 CERROR("Can't unpack obd_quotactl\n");
2261                 RETURN(-EPROTO);
2262         }
2263
2264         cli->cl_qchk_stat = oqctl->qc_stat;
2265
2266         return 0;
2267 }
2268
2269 #ifdef HAVE_QUOTA_SUPPORT
2270 int target_handle_dqacq_callback(struct ptlrpc_request *req)
2271 {
2272 #ifdef __KERNEL__
2273         struct obd_device *obd = req->rq_export->exp_obd;
2274         struct obd_device *master_obd;
2275         struct obd_device_target *obt;
2276         struct lustre_quota_ctxt *qctxt;
2277         struct qunit_data *qdata = NULL;
2278         int rc = 0;
2279         ENTRY;
2280
2281         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_DROP_QUOTA_REQ))
2282                 RETURN(rc);
2283
2284         rc = req_capsule_server_pack(&req->rq_pill);
2285         if (rc) {
2286                 CERROR("packing reply failed!: rc = %d\n", rc);
2287                 RETURN(rc);
2288         }
2289
2290         LASSERT(req->rq_export);
2291
2292         qdata = quota_get_qdata(req, QUOTA_REQUEST, QUOTA_EXPORT);
2293         if (IS_ERR(qdata)) {
2294                 rc = PTR_ERR(qdata);
2295                 CDEBUG(D_ERROR, "Can't unpack qunit_data(rc: %d)\n", rc);
2296                 req->rq_status = rc;
2297                 GOTO(out, rc);
2298         }
2299
2300         /* we use the observer */
2301         if (!obd->obd_observer || !obd->obd_observer->obd_observer) {
2302                 CERROR("Can't find the observer, it is recovering\n");
2303                 req->rq_status = -EAGAIN;
2304                 GOTO(out, rc);
2305         }
2306
2307         master_obd = obd->obd_observer->obd_observer;
2308         obt = &master_obd->u.obt;
2309         qctxt = &obt->obt_qctxt;
2310
2311         if (!qctxt->lqc_setup || !qctxt->lqc_valid) {
2312                 /* quota_type has not been processed yet, return EAGAIN
2313                  * until we know whether or not quotas are supposed to
2314                  * be enabled */
2315                 CDEBUG(D_QUOTA, "quota_type not processed yet, return "
2316                        "-EAGAIN\n");
2317                 req->rq_status = -EAGAIN;
2318                 GOTO(out, rc);
2319         }
2320
2321         down_read(&obt->obt_rwsem);
2322         if (qctxt->lqc_lqs_hash == NULL) {
2323                 up_read(&obt->obt_rwsem);
2324                 /* quota_type has not been processed yet, return EAGAIN
2325                  * until we know whether or not quotas are supposed to
2326                  * be enabled */
2327                 CDEBUG(D_QUOTA, "quota_ctxt is not ready yet, return "
2328                        "-EAGAIN\n");
2329                 req->rq_status = -EAGAIN;
2330                 GOTO(out, rc);
2331         }
2332
2333         LASSERT(qctxt->lqc_handler);
2334         rc = qctxt->lqc_handler(master_obd, qdata,
2335                                 lustre_msg_get_opc(req->rq_reqmsg));
2336         up_read(&obt->obt_rwsem);
2337         if (rc && rc != -EDQUOT)
2338                 CDEBUG(rc == -EBUSY  ? D_QUOTA : D_ERROR,
2339                        "dqacq/dqrel failed! (rc:%d)\n", rc);
2340         req->rq_status = rc;
2341
2342         rc = quota_copy_qdata(req, qdata, QUOTA_REPLY, QUOTA_EXPORT);
2343         if (rc < 0) {
2344                 CERROR("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         EXIT;
2351
2352 out:
2353         rc = ptlrpc_reply(req);
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