lustre/ldlm/ldlm_lib.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #ifndef EXPORT_SYMTAB
  38 # define EXPORT_SYMTAB
  39 #endif
  40 #define DEBUG_SUBSYSTEM S_LDLM
  41
  42 #ifdef __KERNEL__
  43 # include <libcfs/libcfs.h>
  44 #else
  45 # include <liblustre.h>
  46 #endif
  47 #include <obd.h>
  48 #include <lustre_mds.h>
  49 #include <lustre_dlm.h>
  50 #include <lustre_net.h>
  51 #include <lustre_sec.h>
  52 #include "ldlm_internal.h"
  53
  54 /* @priority: if non-zero, move the selected to the list head
  55  * @create: if zero, only search in existed connections
  56  */
  57 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  58                            int priority, int create)
  59 {
  60         struct ptlrpc_connection *ptlrpc_conn;
  61         struct obd_import_conn *imp_conn = NULL, *item;
  62         int rc = 0;
  63         ENTRY;
  64
  65         if (!create && !priority) {
  66                 CDEBUG(D_HA, "Nothing to do\n");
  67                 RETURN(-EINVAL);
  68         }
  69
  70         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
  71         if (!ptlrpc_conn) {
  72                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  73                 RETURN (-ENOENT);
  74         }
  75
  76         if (create) {
  77                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  78                 if (!imp_conn) {
  79                         GOTO(out_put, rc = -ENOMEM);
  80                 }
  81         }
  82
  83         spin_lock(&imp->imp_lock);
  84         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  85                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  86                         if (priority) {
  87                                 list_del(&item->oic_item);
  88                                 list_add(&item->oic_item, &imp->imp_conn_list);
  89                                 item->oic_last_attempt = 0;
  90                         }
  91                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  92                                imp, imp->imp_obd->obd_name, uuid->uuid,
  93                                (priority ? ", moved to head" : ""));
  94                         spin_unlock(&imp->imp_lock);
  95                         GOTO(out_free, rc = 0);
  96                 }
  97         }
  98         /* not found */
  99         if (create) {
 100                 imp_conn->oic_conn = ptlrpc_conn;
 101                 imp_conn->oic_uuid = *uuid;
 102                 item->oic_last_attempt = 0;
 103                 if (priority)
 104                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 105                 else
 106                         list_add_tail(&imp_conn->oic_item, &imp->imp_conn_list);
 107                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 108                        imp, imp->imp_obd->obd_name, uuid->uuid,
 109                        (priority ? "head" : "tail"));
 110         } else {
 111                 spin_unlock(&imp->imp_lock);
 112                 GOTO(out_free, rc = -ENOENT);
 113         }
 114
 115         spin_unlock(&imp->imp_lock);
 116         RETURN(0);
 117 out_free:
 118         if (imp_conn)
 119                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 120 out_put:
 121         ptlrpc_connection_put(ptlrpc_conn);
 122         RETURN(rc);
 123 }
 124
 125 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 126 {
 127         return import_set_conn(imp, uuid, 1, 0);
 128 }
 129
 130 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 131                            int priority)
 132 {
 133         return import_set_conn(imp, uuid, priority, 1);
 134 }
 135
 136 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 137 {
 138         struct obd_import_conn *imp_conn;
 139         struct obd_export *dlmexp;
 140         int rc = -ENOENT;
 141         ENTRY;
 142
 143         spin_lock(&imp->imp_lock);
 144         if (list_empty(&imp->imp_conn_list)) {
 145                 LASSERT(!imp->imp_connection);
 146                 GOTO(out, rc);
 147         }
 148
 149         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 150                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 151                         continue;
 152                 LASSERT(imp_conn->oic_conn);
 153
 154                 /* is current conn? */
 155                 if (imp_conn == imp->imp_conn_current) {
 156                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 157
 158                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 159                             imp->imp_state != LUSTRE_IMP_DISCON) {
 160                                 CERROR("can't remove current connection\n");
 161                                 GOTO(out, rc = -EBUSY);
 162                         }
 163
 164                         ptlrpc_connection_put(imp->imp_connection);
 165                         imp->imp_connection = NULL;
 166
 167                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 168                         if (dlmexp && dlmexp->exp_connection) {
 169                                 LASSERT(dlmexp->exp_connection ==
 170                                         imp_conn->oic_conn);
 171                                 ptlrpc_connection_put(dlmexp->exp_connection);
 172                                 dlmexp->exp_connection = NULL;
 173                         }
 174                 }
 175
 176                 list_del(&imp_conn->oic_item);
 177                 ptlrpc_connection_put(imp_conn->oic_conn);
 178                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 179                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 180                        imp, imp->imp_obd->obd_name, uuid->uuid);
 181                 rc = 0;
 182                 break;
 183         }
 184 out:
 185         spin_unlock(&imp->imp_lock);
 186         if (rc == -ENOENT)
 187                 CERROR("connection %s not found\n", uuid->uuid);
 188         RETURN(rc);
 189 }
 190
 191 static void destroy_import(struct obd_import *imp)
 192 {
 193         /* drop security policy instance after all rpc finished/aborted
 194          * to let all busy contexts be released. */
 195         class_import_get(imp);
 196         class_destroy_import(imp);
 197         sptlrpc_import_sec_put(imp);
 198         class_import_put(imp);
 199 }
 200
 201 /* configure an RPC client OBD device
 202  *
 203  * lcfg parameters:
 204  * 1 - client UUID
 205  * 2 - server UUID
 206  * 3 - inactive-on-startup
 207  */
 208 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 209 {
 210         struct client_obd *cli = &obddev->u.cli;
 211         struct obd_import *imp;
 212         struct obd_uuid server_uuid;
 213         int rq_portal, rp_portal, connect_op;
 214         char *name = obddev->obd_type->typ_name;
 215         int rc;
 216         ENTRY;
 217
 218         /* In a more perfect world, we would hang a ptlrpc_client off of
 219          * obd_type and just use the values from there. */
 220         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 221                 rq_portal = OST_REQUEST_PORTAL;
 222                 rp_portal = OSC_REPLY_PORTAL;
 223                 connect_op = OST_CONNECT;
 224                 cli->cl_sp_me = LUSTRE_SP_CLI;
 225                 cli->cl_sp_to = LUSTRE_SP_OST;
 226         } else if (!strcmp(name, LUSTRE_MDC_NAME)) {
 227                 rq_portal = MDS_REQUEST_PORTAL;
 228                 rp_portal = MDC_REPLY_PORTAL;
 229                 connect_op = MDS_CONNECT;
 230                 cli->cl_sp_me = LUSTRE_SP_CLI;
 231                 cli->cl_sp_to = LUSTRE_SP_MDT;
 232         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 233                 rq_portal = MGS_REQUEST_PORTAL;
 234                 rp_portal = MGC_REPLY_PORTAL;
 235                 connect_op = MGS_CONNECT;
 236                 cli->cl_sp_me = LUSTRE_SP_MGC;
 237                 cli->cl_sp_to = LUSTRE_SP_MGS;
 238                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 239         } else {
 240                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 241                        name);
 242                 RETURN(-EINVAL);
 243         }
 244
 245         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 246                 CERROR("requires a TARGET UUID\n");
 247                 RETURN(-EINVAL);
 248         }
 249
 250         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 251                 CERROR("client UUID must be less than 38 characters\n");
 252                 RETURN(-EINVAL);
 253         }
 254
 255         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 256                 CERROR("setup requires a SERVER UUID\n");
 257                 RETURN(-EINVAL);
 258         }
 259
 260         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 261                 CERROR("target UUID must be less than 38 characters\n");
 262                 RETURN(-EINVAL);
 263         }
 264
 265         init_rwsem(&cli->cl_sem);
 266         sema_init(&cli->cl_mgc_sem, 1);
 267         cli->cl_conn_count = 0;
 268         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 269                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 270                      sizeof(server_uuid)));
 271
 272         cli->cl_dirty = 0;
 273         cli->cl_avail_grant = 0;
 274         /* FIXME: should limit this for the sum of all cl_dirty_max */
 275         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 276         if (cli->cl_dirty_max >> CFS_PAGE_SHIFT > num_physpages / 8)
 277                 cli->cl_dirty_max = num_physpages << (CFS_PAGE_SHIFT - 3);
 278         CFS_INIT_LIST_HEAD(&cli->cl_cache_waiters);
 279         CFS_INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 280         CFS_INIT_LIST_HEAD(&cli->cl_loi_write_list);
 281         CFS_INIT_LIST_HEAD(&cli->cl_loi_read_list);
 282         client_obd_list_lock_init(&cli->cl_loi_list_lock);
 283         cli->cl_r_in_flight = 0;
 284         cli->cl_w_in_flight = 0;
 285
 286         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 287         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 288         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 289         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 290         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 291         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 292         cfs_waitq_init(&cli->cl_destroy_waitq);
 293         atomic_set(&cli->cl_destroy_in_flight, 0);
 294 #ifdef ENABLE_CHECKSUM
 295         /* Turn on checksumming by default. */
 296         cli->cl_checksum = 1;
 297         /*
 298          * The supported checksum types will be worked out at connect time
 299          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 300          * through procfs.
 301          */
 302         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 303 #endif
 304         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 305
 306         /* This value may be changed at connect time in
 307            ptlrpc_connect_interpret. */
 308         cli->cl_max_pages_per_rpc = min((int)PTLRPC_MAX_BRW_PAGES,
 309                                         (int)(1024 * 1024 >> CFS_PAGE_SHIFT));
 310
 311         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 312                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
 313         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 128 /* MB */) {
 314                 cli->cl_max_rpcs_in_flight = 2;
 315         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 256 /* MB */) {
 316                 cli->cl_max_rpcs_in_flight = 3;
 317         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 512 /* MB */) {
 318                 cli->cl_max_rpcs_in_flight = 4;
 319         } else {
 320                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 321         }
 322
 323         rc = ldlm_get_ref();
 324         if (rc) {
 325                 CERROR("ldlm_get_ref failed: %d\n", rc);
 326                 GOTO(err, rc);
 327         }
 328
 329         ptlrpc_init_client(rq_portal, rp_portal, name,
 330                            &obddev->obd_ldlm_client);
 331
 332         imp = class_new_import(obddev);
 333         if (imp == NULL)
 334                 GOTO(err_ldlm, rc = -ENOENT);
 335         imp->imp_client = &obddev->obd_ldlm_client;
 336         imp->imp_connect_op = connect_op;
 337         imp->imp_initial_recov = 1;
 338         imp->imp_initial_recov_bk = 0;
 339         CFS_INIT_LIST_HEAD(&imp->imp_pinger_chain);
 340         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 341                LUSTRE_CFG_BUFLEN(lcfg, 1));
 342         class_import_put(imp);
 343
 344         rc = client_import_add_conn(imp, &server_uuid, 1);
 345         if (rc) {
 346                 CERROR("can't add initial connection\n");
 347                 GOTO(err_import, rc);
 348         }
 349
 350         cli->cl_import = imp;
 351         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 352         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 353         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 354
 355         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 356                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 357                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 358                                name, obddev->obd_name,
 359                                cli->cl_target_uuid.uuid);
 360                         spin_lock(&imp->imp_lock);
 361                         imp->imp_invalid = 1;
 362                         spin_unlock(&imp->imp_lock);
 363                 }
 364         }
 365
 366         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 367
 368         RETURN(rc);
 369
 370 err_import:
 371         class_destroy_import(imp);
 372 err_ldlm:
 373         ldlm_put_ref();
 374 err:
 375         RETURN(rc);
 376
 377 }
 378
 379 int client_obd_cleanup(struct obd_device *obddev)
 380 {
 381         ENTRY;
 382         ldlm_put_ref();
 383         RETURN(0);
 384 }
 385
 386 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 387 int client_connect_import(const struct lu_env *env,
 388                           struct lustre_handle *dlm_handle,
 389                           struct obd_device *obd, struct obd_uuid *cluuid,
 390                           struct obd_connect_data *data, void *localdata)
 391 {
 392         struct client_obd *cli = &obd->u.cli;
 393         struct obd_import *imp = cli->cl_import;
 394         struct obd_export *exp;
 395         struct obd_connect_data *ocd;
 396         struct ldlm_namespace *to_be_freed = NULL;
 397         int rc;
 398         ENTRY;
 399
 400         down_write(&cli->cl_sem);
 401         rc = class_connect(dlm_handle, obd, cluuid);
 402         if (rc)
 403                 GOTO(out_sem, rc);
 404
 405         cli->cl_conn_count++;
 406         if (cli->cl_conn_count > 1)
 407                 GOTO(out_sem, rc);
 408         exp = class_conn2export(dlm_handle);
 409
 410         if (obd->obd_namespace != NULL)
 411                 CERROR("already have namespace!\n");
 412         obd->obd_namespace = ldlm_namespace_new(obd, obd->obd_name,
 413                                                 LDLM_NAMESPACE_CLIENT,
 414                                                 LDLM_NAMESPACE_GREEDY);
 415         if (obd->obd_namespace == NULL)
 416                 GOTO(out_disco, rc = -ENOMEM);
 417
 418         imp->imp_dlm_handle = *dlm_handle;
 419         rc = ptlrpc_init_import(imp);
 420         if (rc != 0)
 421                 GOTO(out_ldlm, rc);
 422
 423         ocd = &imp->imp_connect_data;
 424         if (data) {
 425                 *ocd = *data;
 426                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 427         }
 428
 429         rc = ptlrpc_connect_import(imp, NULL);
 430         if (rc != 0) {
 431                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 432                 GOTO(out_ldlm, rc);
 433         }
 434         LASSERT(exp->exp_connection);
 435
 436         if (data) {
 437                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 438                          ocd->ocd_connect_flags, "old "LPX64", new "LPX64"\n",
 439                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 440                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 441         }
 442
 443         ptlrpc_pinger_add_import(imp);
 444
 445         EXIT;
 446
 447         if (rc) {
 448 out_ldlm:
 449                 ldlm_namespace_free_prior(obd->obd_namespace, imp, 0);
 450                 to_be_freed = obd->obd_namespace;
 451                 obd->obd_namespace = NULL;
 452 out_disco:
 453                 cli->cl_conn_count--;
 454                 class_disconnect(exp);
 455         } else {
 456                 class_export_put(exp);
 457         }
 458 out_sem:
 459         up_write(&cli->cl_sem);
 460         if (to_be_freed)
 461                 ldlm_namespace_free_post(to_be_freed);
 462
 463         return rc;
 464 }
 465
 466 int client_disconnect_export(struct obd_export *exp)
 467 {
 468         struct obd_device *obd = class_exp2obd(exp);
 469         struct client_obd *cli;
 470         struct obd_import *imp;
 471         int rc = 0, err;
 472         struct ldlm_namespace *to_be_freed = NULL;
 473         ENTRY;
 474
 475         if (!obd) {
 476                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 477                        exp, exp ? exp->exp_handle.h_cookie : -1);
 478                 RETURN(-EINVAL);
 479         }
 480
 481         cli = &obd->u.cli;
 482         imp = cli->cl_import;
 483
 484         down_write(&cli->cl_sem);
 485         if (!cli->cl_conn_count) {
 486                 CERROR("disconnecting disconnected device (%s)\n",
 487                        obd->obd_name);
 488                 GOTO(out_sem, rc = -EINVAL);
 489         }
 490
 491         cli->cl_conn_count--;
 492         if (cli->cl_conn_count)
 493                 GOTO(out_no_disconnect, rc = 0);
 494
 495         /* Mark import deactivated now, so we don't try to reconnect if any
 496          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
 497          * fully deactivate the import, or that would drop all requests. */
 498         spin_lock(&imp->imp_lock);
 499         imp->imp_deactive = 1;
 500         spin_unlock(&imp->imp_lock);
 501
 502         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 503          * delete it regardless.  (It's safe to delete an import that was
 504          * never added.) */
 505         (void)ptlrpc_pinger_del_import(imp);
 506
 507         if (obd->obd_namespace != NULL) {
 508                 /* obd_force == local only */
 509                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 510                                        obd->obd_force ? LDLM_FL_LOCAL_ONLY:0,
 511                                        NULL);
 512                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 513                 to_be_freed = obd->obd_namespace;
 514         }
 515
 516         rc = ptlrpc_disconnect_import(imp, 0);
 517
 518         ptlrpc_invalidate_import(imp);
 519         /* set obd_namespace to NULL only after invalidate, because we can have
 520          * some connect requests in flight, and his need store a connect flags
 521          * in obd_namespace. bug 14260 */
 522         obd->obd_namespace = NULL;
 523
 524         if (imp->imp_rq_pool) {
 525                 ptlrpc_free_rq_pool(imp->imp_rq_pool);
 526                 imp->imp_rq_pool = NULL;
 527         }
 528         destroy_import(imp);
 529         cli->cl_import = NULL;
 530
 531         EXIT;
 532  out_no_disconnect:
 533         err = class_disconnect(exp);
 534         if (!rc && err)
 535                 rc = err;
 536  out_sem:
 537         up_write(&cli->cl_sem);
 538         if (to_be_freed)
 539                 ldlm_namespace_free_post(to_be_freed);
 540
 541         RETURN(rc);
 542 }
 543
 544 /* --------------------------------------------------------------------------
 545  * from old lib/target.c
 546  * -------------------------------------------------------------------------- */
 547
 548 int target_handle_reconnect(struct lustre_handle *conn, struct obd_export *exp,
 549                             struct obd_uuid *cluuid, int initial_conn)
 550 {
 551         ENTRY;
 552         if (exp->exp_connection && exp->exp_imp_reverse && !initial_conn) {
 553                 struct lustre_handle *hdl;
 554                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 555                 /* Might be a re-connect after a partition. */
 556                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 557                         CWARN("%s: %s reconnecting\n", exp->exp_obd->obd_name,
 558                               cluuid->uuid);
 559                         conn->cookie = exp->exp_handle.h_cookie;
 560                         /* target_handle_connect() treats EALREADY and
 561                          * -EALREADY differently.  EALREADY means we are
 562                          * doing a valid reconnect from the same client. */
 563                         RETURN(EALREADY);
 564                 } else {
 565                         CERROR("%s reconnecting from %s, "
 566                                "handle mismatch (ours "LPX64", theirs "
 567                                LPX64")\n", cluuid->uuid,
 568                                exp->exp_connection->c_remote_uuid.uuid,
 569                                hdl->cookie, conn->cookie);
 570                         memset(conn, 0, sizeof *conn);
 571                         /* target_handle_connect() treats EALREADY and
 572                          * -EALREADY differently.  -EALREADY is an error
 573                          * (same UUID, different handle). */
 574                         RETURN(-EALREADY);
 575                 }
 576         }
 577
 578         conn->cookie = exp->exp_handle.h_cookie;
 579         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
 580                cluuid->uuid, exp, conn->cookie);
 581         RETURN(0);
 582 }
 583
 584 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
 585                           int error)
 586 {
 587         struct obd_export *exp = cb_data;
 588
 589         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 590                obd->obd_name, exp->exp_client_uuid.uuid);
 591
 592         spin_lock(&exp->exp_lock);
 593         exp->exp_need_sync = 0;
 594         spin_unlock(&exp->exp_lock);
 595 }
 596 EXPORT_SYMBOL(target_client_add_cb);
 597 static void
 598 target_start_and_reset_recovery_timer(struct obd_device *obd,
 599                                       struct ptlrpc_request *req,
 600                                       int new_client);
 601
 602 int target_handle_connect(struct ptlrpc_request *req)
 603 {
 604         struct obd_device *target, *targref = NULL;
 605         struct obd_export *export = NULL;
 606         struct obd_import *revimp;
 607         struct lustre_handle conn;
 608         struct lustre_handle *tmp;
 609         struct obd_uuid tgtuuid;
 610         struct obd_uuid cluuid;
 611         struct obd_uuid remote_uuid;
 612         char *str;
 613         int rc = 0;
 614         int initial_conn = 0;
 615         struct obd_connect_data *data, *tmpdata;
 616         lnet_nid_t *client_nid = NULL;
 617         ENTRY;
 618
 619         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 620
 621         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 622         if (str == NULL) {
 623                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 624                 GOTO(out, rc = -EINVAL);
 625         }
 626
 627         obd_str2uuid(&tgtuuid, str);
 628         target = class_uuid2obd(&tgtuuid);
 629         if (!target)
 630                 target = class_name2obd(str);
 631
 632         if (!target || target->obd_stopping || !target->obd_set_up) {
 633                 LCONSOLE_ERROR_MSG(0x137, "UUID '%s' is not available "
 634                                    " for connect (%s)\n", str,
 635                                    !target ? "no target" :
 636                                    (target->obd_stopping ? "stopping" :
 637                                    "not set up"));
 638                 GOTO(out, rc = -ENODEV);
 639         }
 640
 641         if (target->obd_no_conn) {
 642                 LCONSOLE_WARN("%s: temporarily refusing client connection "
 643                               "from %s\n", target->obd_name,
 644                               libcfs_nid2str(req->rq_peer.nid));
 645                 GOTO(out, rc = -EAGAIN);
 646         }
 647
 648         /* Make sure the target isn't cleaned up while we're here. Yes,
 649            there's still a race between the above check and our incref here.
 650            Really, class_uuid2obd should take the ref. */
 651         targref = class_incref(target, __FUNCTION__, cfs_current());
 652
 653
 654         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
 655         if (str == NULL) {
 656                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
 657                 GOTO(out, rc = -EINVAL);
 658         }
 659
 660         obd_str2uuid(&cluuid, str);
 661
 662         /* XXX extract a nettype and format accordingly */
 663         switch (sizeof(lnet_nid_t)) {
 664                 /* NB the casts only avoid compiler warnings */
 665         case 8:
 666                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 667                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
 668                 break;
 669         case 4:
 670                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 671                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
 672                 break;
 673         default:
 674                 LBUG();
 675         }
 676
 677         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 678         if (tmp == NULL)
 679                 GOTO(out, rc = -EPROTO);
 680
 681         conn = *tmp;
 682
 683         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 684         if (!data)
 685                 GOTO(out, rc = -EPROTO);
 686
 687         rc = req_capsule_server_pack(&req->rq_pill);
 688         if (rc)
 689                 GOTO(out, rc);
 690
 691         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 692                 if (!data) {
 693                         DEBUG_REQ(D_WARNING, req, "Refusing old (unversioned) "
 694                                   "libclient connection attempt");
 695                         GOTO(out, rc = -EPROTO);
 696                 } else if (data->ocd_version < LUSTRE_VERSION_CODE -
 697                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
 698                            data->ocd_version > LUSTRE_VERSION_CODE +
 699                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
 700                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
 701                                   "libclient connection attempt",
 702                                   data->ocd_version < LUSTRE_VERSION_CODE ?
 703                                   "old" : "new",
 704                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
 705                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
 706                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
 707                                   OBD_OCD_VERSION_FIX(data->ocd_version));
 708                         data = req_capsule_server_sized_get(&req->rq_pill,
 709                                                         &RMF_CONNECT_DATA,
 710                                     offsetof(typeof(*data), ocd_version) +
 711                                              sizeof(data->ocd_version));
 712                         if (data) {
 713                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
 714                                 data->ocd_version = LUSTRE_VERSION_CODE;
 715                         }
 716                         GOTO(out, rc = -EPROTO);
 717                 }
 718         }
 719
 720         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL)
 721                 initial_conn = 1;
 722
 723         /* lctl gets a backstage, all-access pass. */
 724         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 725                 goto dont_check_exports;
 726
 727         spin_lock(&target->obd_dev_lock);
 728         export = lustre_hash_lookup(target->obd_uuid_hash, &cluuid);
 729
 730         if (export != NULL && export->exp_connecting) { /* bug 9635, et. al. */
 731                 CWARN("%s: exp %p already connecting\n",
 732                       export->exp_obd->obd_name, export);
 733                 class_export_put(export);
 734                 export = NULL;
 735                 rc = -EALREADY;
 736         } else if (export != NULL && export->exp_connection != NULL &&
 737                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
 738                 /* make darn sure this is coming from the same peer
 739                  * if the UUIDs matched */
 740                 if (data && data->ocd_connect_flags & OBD_CONNECT_MDS) {
 741                         /* the MDS UUID can be reused, don't need to wait
 742                          * for the export to be evicted */
 743                         CWARN("%s: received MDS connection from a new NID %s,"
 744                               " removing former export from NID %s\n",
 745                             target->obd_name,
 746                             libcfs_nid2str(req->rq_peer.nid),
 747                             libcfs_nid2str(export->exp_connection->c_peer.nid));
 748                         class_fail_export(export);
 749                 } else {
 750                         CWARN("%s: cookie %s seen on new NID %s when "
 751                               "existing NID %s is already connected\n",
 752                             target->obd_name, cluuid.uuid,
 753                             libcfs_nid2str(req->rq_peer.nid),
 754                             libcfs_nid2str(export->exp_connection->c_peer.nid));
 755                         rc = -EALREADY;
 756                 }
 757                 class_export_put(export);
 758                 export = NULL;
 759         } else if (export != NULL) {
 760                 spin_lock(&export->exp_lock);
 761                 export->exp_connecting = 1;
 762                 spin_unlock(&export->exp_lock);
 763                 class_export_put(export);
 764                 spin_unlock(&target->obd_dev_lock);
 765                 LASSERT(export->exp_obd == target);
 766
 767                 rc = target_handle_reconnect(&conn, export, &cluuid, initial_conn);
 768         }
 769
 770         /* If we found an export, we already unlocked. */
 771         if (!export) {
 772                 spin_unlock(&target->obd_dev_lock);
 773                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
 774         } else if (req->rq_export == NULL &&
 775                    atomic_read(&export->exp_rpc_count) > 0) {
 776                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
 777                       target->obd_name, cluuid.uuid,
 778                       libcfs_nid2str(req->rq_peer.nid),
 779                       export, atomic_read(&export->exp_refcount));
 780                 GOTO(out, rc = -EBUSY);
 781         } else if (req->rq_export != NULL &&
 782                    (atomic_read(&export->exp_rpc_count) > 1)) {
 783                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
 784                       target->obd_name, cluuid.uuid,
 785                       libcfs_nid2str(req->rq_peer.nid),
 786                       export, atomic_read(&export->exp_rpc_count));
 787                 GOTO(out, rc = -EBUSY);
 788         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
 789                    !initial_conn) {
 790                 CERROR("%s: NID %s (%s) reconnected with 1 conn_cnt; "
 791                        "cookies not random?\n", target->obd_name,
 792                        libcfs_nid2str(req->rq_peer.nid), cluuid.uuid);
 793                 GOTO(out, rc = -EALREADY);
 794         } else {
 795                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
 796                 if (req->rq_export == NULL && initial_conn)
 797                        export->exp_last_request_time =
 798                                max(export->exp_last_request_time,
 799                                    (time_t)cfs_time_current_sec());
 800         }
 801
 802         if (rc < 0) {
 803                 GOTO(out, rc);
 804         }
 805
 806         CWARN("%s: connection from %s@%s %st"LPU64" exp %p cur %ld last %ld\n",
 807                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 808               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
 809               export, (long)cfs_time_current_sec(),
 810               export ? (long)export->exp_last_request_time : 0);
 811
 812         /* Tell the client if we're in recovery. */
 813         if (target->obd_recovering) {
 814                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 815                 /* If this is the first time a client connects,
 816                    reset the recovery timer */
 817                 if (rc == 0)
 818                         target_start_and_reset_recovery_timer(target, req,
 819                                                               !export);
 820         }
 821
 822         /* We want to handle EALREADY but *not* -EALREADY from
 823          * target_handle_reconnect(), return reconnection state in a flag */
 824         if (rc == EALREADY) {
 825                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 826                 rc = 0;
 827         } else {
 828                 LASSERT(rc == 0);
 829         }
 830
 831         /* Tell the client if we support replayable requests */
 832         if (target->obd_replayable)
 833                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 834         client_nid = &req->rq_peer.nid;
 835
 836         if (export == NULL) {
 837                 if (target->obd_recovering) {
 838                         cfs_time_t t;
 839
 840                         t = cfs_timer_deadline(&target->obd_recovery_timer);
 841                         t = cfs_time_sub(t, cfs_time_current());
 842                         CERROR("%s: denying connection for new client %s (%s): "
 843                                "%d clients in recovery for "CFS_TIME_T"s\n",
 844                                target->obd_name,
 845                                libcfs_nid2str(req->rq_peer.nid), cluuid.uuid,
 846                                target->obd_recoverable_clients,
 847                                cfs_duration_sec(t));
 848                         rc = -EBUSY;
 849                 } else {
 850 dont_check_exports:
 851                         rc = obd_connect(req->rq_svc_thread->t_env,
 852                                          &conn, target, &cluuid, data,
 853                                          client_nid);
 854                 }
 855         } else {
 856                 rc = obd_reconnect(req->rq_svc_thread->t_env,
 857                                    export, target, &cluuid, data, client_nid);
 858         }
 859         if (rc)
 860                 GOTO(out, rc);
 861         /* Return only the parts of obd_connect_data that we understand, so the
 862          * client knows that we don't understand the rest. */
 863         if (data) {
 864                  tmpdata = req_capsule_server_get(&req->rq_pill,
 865                                                   &RMF_CONNECT_DATA);
 866                   //data->ocd_connect_flags &= OBD_CONNECT_SUPPORTED;
 867                  *tmpdata = *data;
 868         }
 869
 870         /* If all else goes well, this is our RPC return code. */
 871         req->rq_status = 0;
 872
 873         lustre_msg_set_handle(req->rq_repmsg, &conn);
 874
 875         /* ownership of this export ref transfers to the request AFTER we
 876          * drop any previous reference the request had, but we don't want
 877          * that to go to zero before we get our new export reference. */
 878         export = class_conn2export(&conn);
 879         if (!export) {
 880                 DEBUG_REQ(D_ERROR, req, "Missing export!");
 881                 GOTO(out, rc = -ENODEV);
 882         }
 883
 884         /* If the client and the server are the same node, we will already
 885          * have an export that really points to the client's DLM export,
 886          * because we have a shared handles table.
 887          *
 888          * XXX this will go away when shaver stops sending the "connect" handle
 889          * in the real "remote handle" field of the request --phik 24 Apr 2003
 890          */
 891         if (req->rq_export != NULL)
 892                 class_export_put(req->rq_export);
 893
 894         req->rq_export = export;
 895
 896         spin_lock(&export->exp_lock);
 897         if (initial_conn) {
 898                 lustre_msg_set_conn_cnt(req->rq_repmsg, export->exp_conn_cnt + 1);
 899         } else if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
 900                 spin_unlock(&export->exp_lock);
 901                 CERROR("%s: %s already connected at higher conn_cnt: %d > %d\n",
 902                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 903                        export->exp_conn_cnt,
 904                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
 905
 906                 GOTO(out, rc = -EALREADY);
 907         }
 908         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
 909
 910         /* request from liblustre?  Don't evict it for not pinging. */
 911         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 912                 export->exp_libclient = 1;
 913                 spin_unlock(&export->exp_lock);
 914
 915                 spin_lock(&target->obd_dev_lock);
 916                 list_del_init(&export->exp_obd_chain_timed);
 917                 spin_unlock(&target->obd_dev_lock);
 918         } else {
 919                 spin_unlock(&export->exp_lock);
 920         }
 921
 922         if (export->exp_connection != NULL)
 923                 ptlrpc_connection_put(export->exp_connection);
 924         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
 925                                                        req->rq_self,
 926                                                        &remote_uuid);
 927         if (hlist_unhashed(&export->exp_nid_hash)) {
 928                 lustre_hash_add_unique(export->exp_obd->obd_nid_hash,
 929                                        &export->exp_connection->c_peer.nid,
 930                                        &export->exp_nid_hash);
 931         }
 932
 933         spin_lock_bh(&target->obd_processing_task_lock);
 934         if (target->obd_recovering && !export->exp_in_recovery) {
 935                 spin_lock(&export->exp_lock);
 936                 export->exp_in_recovery = 1;
 937                 export->exp_req_replay_needed = 1;
 938                 export->exp_lock_replay_needed = 1;
 939                 spin_unlock(&export->exp_lock);
 940                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
 941                      && (data->ocd_transno == 0))
 942                         CWARN("Connect with zero transno!\n");
 943
 944                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
 945                      && data->ocd_transno < target->obd_next_recovery_transno)
 946                         target->obd_next_recovery_transno = data->ocd_transno;
 947                 target->obd_connected_clients++;
 948                 /* each connected client is counted as recoverable */
 949                 target->obd_recoverable_clients++;
 950                 atomic_inc(&target->obd_req_replay_clients);
 951                 atomic_inc(&target->obd_lock_replay_clients);
 952                 if (target->obd_connected_clients ==
 953                     target->obd_max_recoverable_clients)
 954                         wake_up(&target->obd_next_transno_waitq);
 955         }
 956         spin_unlock_bh(&target->obd_processing_task_lock);
 957         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 958         conn = *tmp;
 959
 960         if (export->exp_imp_reverse != NULL) {
 961                 /* destroyed import can be still referenced in ctxt */
 962                 obd_set_info_async(export, sizeof(KEY_REVIMP_UPD),
 963                                    KEY_REVIMP_UPD, 0, NULL, NULL);
 964
 965                 /* in some recovery senarios, previous ctx init rpc handled
 966                  * in sptlrpc_target_export_check() might be used to install
 967                  * a reverse ctx in this reverse import, and later OBD_CONNECT
 968                  * using the same gss ctx could reach here and following new
 969                  * reverse import. note all reverse ctx in new/old import are
 970                  * actually based on the same gss ctx. so we invalidate ctx
 971                  * here before destroy import, otherwise flush old import will
 972                  * lead to remote reverse ctx be destroied, thus the reverse
 973                  * ctx of new import will lost its peer.
 974                  * there might be a better way to deal with this???
 975                  */
 976                 sptlrpc_import_inval_all_ctx(export->exp_imp_reverse);
 977
 978                 destroy_import(export->exp_imp_reverse);
 979         }
 980
 981         /* for the rest part, we return -ENOTCONN in case of errors
 982          * in order to let client initialize connection again.
 983          */
 984         revimp = export->exp_imp_reverse = class_new_import(target);
 985         if (!revimp) {
 986                 CERROR("fail to alloc new reverse import.\n");
 987                 GOTO(out, rc = -ENOTCONN);
 988         }
 989
 990         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
 991         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
 992         revimp->imp_remote_handle = conn;
 993         revimp->imp_dlm_fake = 1;
 994         revimp->imp_state = LUSTRE_IMP_FULL;
 995
 996         /* unknown versions will be caught in
 997          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
 998         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
 999
1000         if ((export->exp_connect_flags & OBD_CONNECT_AT) &&
1001             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1002                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1003         else
1004                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1005
1006         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx,
1007                                       req->rq_flvr.sf_rpc);
1008         if (rc) {
1009                 CERROR("Failed to get sec for reverse import: %d\n", rc);
1010                 export->exp_imp_reverse = NULL;
1011                 class_destroy_import(revimp);
1012         }
1013
1014         class_import_put(revimp);
1015 out:
1016         if (export) {
1017                 spin_lock(&export->exp_lock);
1018                 export->exp_connecting = 0;
1019                 spin_unlock(&export->exp_lock);
1020         }
1021         if (targref)
1022                 class_decref(targref, __FUNCTION__, cfs_current());
1023         if (rc)
1024                 req->rq_status = rc;
1025         RETURN(rc);
1026 }
1027
1028 int target_handle_disconnect(struct ptlrpc_request *req)
1029 {
1030         int rc;
1031         ENTRY;
1032
1033         rc = req_capsule_server_pack(&req->rq_pill);
1034         if (rc)
1035                 RETURN(rc);
1036
1037         /* keep the rq_export around so we can send the reply */
1038         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1039
1040         RETURN(0);
1041 }
1042
1043 void target_destroy_export(struct obd_export *exp)
1044 {
1045         /* exports created from last_rcvd data, and "fake"
1046            exports created by lctl don't have an import */
1047         if (exp->exp_imp_reverse != NULL)
1048                 destroy_import(exp->exp_imp_reverse);
1049
1050         /* We cancel locks at disconnect time, but this will catch any locks
1051          * granted in a race with recovery-induced disconnect. */
1052         if (exp->exp_obd->obd_namespace != NULL)
1053                 ldlm_cancel_locks_for_export(exp);
1054 }
1055
1056 /*
1057  * Recovery functions
1058  */
1059
1060 struct ptlrpc_request *ptlrpc_clone_req( struct ptlrpc_request *orig_req)
1061 {
1062         struct ptlrpc_request *copy_req;
1063         struct lustre_msg *copy_reqmsg;
1064         struct ptlrpc_user_desc *udesc = NULL;
1065
1066         OBD_ALLOC_PTR(copy_req);
1067         if (!copy_req)
1068                 return NULL;
1069         OBD_ALLOC(copy_reqmsg, orig_req->rq_reqlen);
1070         if (!copy_reqmsg){
1071                 OBD_FREE_PTR(copy_req);
1072                 return NULL;
1073         }
1074
1075         if (orig_req->rq_user_desc) {
1076                 int ngroups = orig_req->rq_user_desc->pud_ngroups;
1077
1078                 OBD_ALLOC(udesc, sptlrpc_user_desc_size(ngroups));
1079                 if (!udesc) {
1080                         OBD_FREE(copy_reqmsg, orig_req->rq_reqlen);
1081                         OBD_FREE_PTR(copy_req);
1082                         return NULL;
1083                 }
1084                 memcpy(udesc, orig_req->rq_user_desc,
1085                        sptlrpc_user_desc_size(ngroups));
1086         }
1087
1088         *copy_req = *orig_req;
1089         memcpy(copy_reqmsg, orig_req->rq_reqmsg, orig_req->rq_reqlen);
1090         copy_req->rq_reqmsg = copy_reqmsg;
1091         copy_req->rq_user_desc = udesc;
1092
1093         class_export_rpc_get(copy_req->rq_export);
1094         CFS_INIT_LIST_HEAD(&copy_req->rq_list);
1095         CFS_INIT_LIST_HEAD(&copy_req->rq_replay_list);
1096         sptlrpc_svc_ctx_addref(copy_req);
1097
1098         if (copy_req->rq_reply_state) {
1099                 /* the copied req takes over the reply state */
1100                 orig_req->rq_reply_state = NULL;
1101                 /* to catch further access */
1102                 orig_req->rq_repmsg = NULL;
1103                 orig_req->rq_replen = 0;
1104         }
1105
1106         return copy_req;
1107 }
1108
1109 void ptlrpc_free_clone(struct ptlrpc_request *req)
1110 {
1111         LASSERT(list_empty(&req->rq_replay_list));
1112
1113         ptlrpc_req_drop_rs(req);
1114         sptlrpc_svc_ctx_decref(req);
1115         class_export_rpc_put(req->rq_export);
1116         list_del_init(&req->rq_list);
1117
1118         if (req->rq_user_desc) {
1119                 int ngroups = req->rq_user_desc->pud_ngroups;
1120                 OBD_FREE(req->rq_user_desc, sptlrpc_user_desc_size(ngroups));
1121         }
1122         OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
1123         OBD_FREE_PTR(req);
1124 }
1125
1126 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1127 {
1128         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1129         struct obd_export     *exp = req->rq_export;
1130         struct ptlrpc_request *reqiter;
1131         int                    dup = 0;
1132
1133         LASSERT(exp);
1134
1135         spin_lock(&exp->exp_lock);
1136         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1137                             rq_replay_list) {
1138                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1139                         dup = 1;
1140                         break;
1141                 }
1142         }
1143
1144         if (dup) {
1145                 /* we expect it with RESENT and REPLAY flags */
1146                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1147                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1148                         CERROR("invalid flags %x of resent replay\n",
1149                                lustre_msg_get_flags(req->rq_reqmsg));
1150         } else {
1151                 list_add_tail(&req->rq_replay_list, &exp->exp_req_replay_queue);
1152         }
1153
1154         spin_unlock(&exp->exp_lock);
1155         return dup;
1156 }
1157
1158 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1159 {
1160         LASSERT(!list_empty(&req->rq_replay_list));
1161         LASSERT(req->rq_export);
1162
1163         spin_lock(&req->rq_export->exp_lock);
1164         list_del_init(&req->rq_replay_list);
1165         spin_unlock(&req->rq_export->exp_lock);
1166 }
1167
1168 #ifdef __KERNEL__
1169 static void target_finish_recovery(struct obd_device *obd)
1170 {
1171         ENTRY;
1172         LCONSOLE_INFO("%s: sending delayed replies to recovered clients\n",
1173                       obd->obd_name);
1174
1175         ldlm_reprocess_all_ns(obd->obd_namespace);
1176         spin_lock_bh(&obd->obd_processing_task_lock);
1177         if (list_empty(&obd->obd_req_replay_queue) &&
1178             list_empty(&obd->obd_lock_replay_queue) &&
1179             list_empty(&obd->obd_final_req_queue)) {
1180                 obd->obd_processing_task = 0;
1181         } else {
1182                 CERROR("%s: Recovery queues ( %s%s%s) are empty\n",
1183                        obd->obd_name,
1184                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1185                        list_empty(&obd->obd_lock_replay_queue) ? "" : "lock ",
1186                        list_empty(&obd->obd_final_req_queue) ? "" : "final ");
1187                 spin_unlock_bh(&obd->obd_processing_task_lock);
1188                 LBUG();
1189         }
1190         spin_unlock_bh(&obd->obd_processing_task_lock);
1191
1192         /* when recovery finished, cleanup orphans on mds and ost */
1193         if (OBT(obd) && OBP(obd, postrecov)) {
1194                 int rc = OBP(obd, postrecov)(obd);
1195                 LCONSOLE_WARN("%s: recovery %s: rc %d\n", obd->obd_name,
1196                               rc < 0 ? "failed" : "complete", rc);
1197         }
1198
1199         obd->obd_recovery_end = cfs_time_current_sec();
1200         EXIT;
1201 }
1202
1203 static void abort_req_replay_queue(struct obd_device *obd)
1204 {
1205         struct ptlrpc_request *req, *n;
1206         struct list_head abort_list;
1207
1208         CFS_INIT_LIST_HEAD(&abort_list);
1209         spin_lock_bh(&obd->obd_processing_task_lock);
1210         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1211         spin_unlock_bh(&obd->obd_processing_task_lock);
1212         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1213                 DEBUG_REQ(D_WARNING, req, "aborted:");
1214                 req->rq_status = -ENOTCONN;
1215                 if (ptlrpc_error(req)) {
1216                         DEBUG_REQ(D_ERROR, req,
1217                                   "failed abort_req_reply; skipping");
1218                 }
1219                 target_exp_dequeue_req_replay(req);
1220                 ptlrpc_free_clone(req);
1221         }
1222 }
1223
1224 static void abort_lock_replay_queue(struct obd_device *obd)
1225 {
1226         struct ptlrpc_request *req, *n;
1227         struct list_head abort_list;
1228
1229         CFS_INIT_LIST_HEAD(&abort_list);
1230         spin_lock_bh(&obd->obd_processing_task_lock);
1231         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1232         spin_unlock_bh(&obd->obd_processing_task_lock);
1233         list_for_each_entry_safe(req, n, &obd->obd_lock_replay_queue, rq_list){
1234                 DEBUG_REQ(D_ERROR, req, "aborted:");
1235                 req->rq_status = -ENOTCONN;
1236                 if (ptlrpc_error(req)) {
1237                         DEBUG_REQ(D_ERROR, req,
1238                                   "failed abort_lock_reply; skipping");
1239                 }
1240                 ptlrpc_free_clone(req);
1241         }
1242 }
1243 #endif
1244
1245 /* Called from a cleanup function if the device is being cleaned up
1246    forcefully.  The exports should all have been disconnected already,
1247    the only thing left to do is
1248      - clear the recovery flags
1249      - cancel the timer
1250      - free queued requests and replies, but don't send replies
1251    Because the obd_stopping flag is set, no new requests should be received.
1252
1253 */
1254 void target_cleanup_recovery(struct obd_device *obd)
1255 {
1256         struct ptlrpc_request *req, *n;
1257         struct list_head clean_list;
1258         ENTRY;
1259
1260         LASSERT(obd->obd_stopping);
1261
1262         CFS_INIT_LIST_HEAD(&clean_list);
1263         spin_lock_bh(&obd->obd_processing_task_lock);
1264         if (!obd->obd_recovering) {
1265                 spin_unlock_bh(&obd->obd_processing_task_lock);
1266                 EXIT;
1267                 return;
1268         }
1269         obd->obd_recovering = obd->obd_abort_recovery = 0;
1270         target_cancel_recovery_timer(obd);
1271
1272         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1273         spin_unlock_bh(&obd->obd_processing_task_lock);
1274
1275         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1276                 LASSERT(req->rq_reply_state == 0);
1277                 target_exp_dequeue_req_replay(req);
1278                 ptlrpc_free_clone(req);
1279         }
1280
1281         spin_lock_bh(&obd->obd_processing_task_lock);
1282         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1283         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1284         spin_unlock_bh(&obd->obd_processing_task_lock);
1285
1286         list_for_each_entry_safe(req, n, &clean_list, rq_list){
1287                 LASSERT(req->rq_reply_state == 0);
1288                 ptlrpc_free_clone(req);
1289         }
1290
1291         EXIT;
1292 }
1293
1294 /* obd_processing_task_lock should be held */
1295 void target_cancel_recovery_timer(struct obd_device *obd)
1296 {
1297         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1298         cfs_timer_disarm(&obd->obd_recovery_timer);
1299 }
1300
1301 /* extend = 1 means require at least "duration" seconds left in the timer,
1302    extend = 0 means set the total duration (start_recovery_timer) */
1303 static void reset_recovery_timer(struct obd_device *obd, int duration,
1304                                  int extend)
1305 {
1306         cfs_time_t now = cfs_time_current_sec();
1307         cfs_duration_t left;
1308
1309         spin_lock_bh(&obd->obd_processing_task_lock);
1310         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1311                 spin_unlock_bh(&obd->obd_processing_task_lock);
1312                 return;
1313         }
1314
1315         left = cfs_time_sub(obd->obd_recovery_end, now);
1316
1317         if (extend && (duration > left))
1318                 obd->obd_recovery_timeout += duration - left;
1319         else if (!extend && (duration > obd->obd_recovery_timeout))
1320                 /* Track the client's largest expected replay time */
1321                 obd->obd_recovery_timeout = duration;
1322 #ifdef CRAY_XT3
1323         /*
1324          * If total recovery time already exceed the
1325          * obd_recovery_max_time, then CRAY XT3 will
1326          * abort the recovery
1327          */
1328         if(obd->obd_recovery_timeout > obd->obd_recovery_max_time)
1329                 obd->obd_recovery_timeout = obd->obd_recovery_max_time;
1330 #endif
1331         obd->obd_recovery_end = obd->obd_recovery_start +
1332                                 obd->obd_recovery_timeout;
1333         if (!cfs_timer_is_armed(&obd->obd_recovery_timer) ||
1334             cfs_time_before(now, obd->obd_recovery_end)) {
1335                 left = cfs_time_sub(obd->obd_recovery_end, now);
1336                 cfs_timer_arm(&obd->obd_recovery_timer, cfs_time_shift(left));
1337         }
1338         spin_unlock_bh(&obd->obd_processing_task_lock);
1339         CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
1340                obd->obd_name, (unsigned)left);
1341 }
1342
1343 static void check_and_start_recovery_timer(struct obd_device *obd)
1344 {
1345         spin_lock_bh(&obd->obd_processing_task_lock);
1346         if (cfs_timer_is_armed(&obd->obd_recovery_timer)) {
1347                 spin_unlock_bh(&obd->obd_processing_task_lock);
1348                 return;
1349         }
1350         CWARN("%s: starting recovery timer\n", obd->obd_name);
1351         obd->obd_recovery_start = cfs_time_current_sec();
1352         /* minimum */
1353         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1354         spin_unlock_bh(&obd->obd_processing_task_lock);
1355
1356         reset_recovery_timer(obd, obd->obd_recovery_timeout, 0);
1357 }
1358
1359 /* Reset the timer with each new client connection */
1360 /*
1361  * This timer is actually reconnect_timer, which is for making sure
1362  * the total recovery window is at least as big as my reconnect
1363  * attempt timing. So the initial recovery time_out will be set to
1364  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1365  * from client is bigger than this, then the recovery time_out will
1366  * be extend to make sure the client could be reconnected, in the
1367  * process, the timeout from the new client should be ignored.
1368  */
1369
1370 static void
1371 target_start_and_reset_recovery_timer(struct obd_device *obd,
1372                                       struct ptlrpc_request *req,
1373                                       int new_client)
1374 {
1375         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1376
1377         if (!new_client && service_time)
1378                 /* Teach server about old server's estimates, as first guess
1379                  * at how long new requests will take. */
1380                 at_add(&req->rq_rqbd->rqbd_service->srv_at_estimate,
1381                        service_time);
1382
1383         check_and_start_recovery_timer(obd);
1384
1385         /* convert the service time to rpc timeout,
1386          * reuse service_time to limit stack usage */
1387         service_time = at_est2timeout(service_time);
1388
1389         /* We expect other clients to timeout within service_time, then try
1390          * to reconnect, then try the failover server.  The max delay between
1391          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL */
1392         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC +
1393                              INITIAL_CONNECT_TIMEOUT);
1394         if (service_time > obd->obd_recovery_timeout && !new_client)
1395                 reset_recovery_timer(obd, service_time, 0);
1396 }
1397
1398 #ifdef __KERNEL__
1399 static int check_for_next_transno(struct obd_device *obd)
1400 {
1401         struct ptlrpc_request *req = NULL;
1402         int wake_up = 0, connected, completed, queue_len, max;
1403         __u64 next_transno, req_transno;
1404         ENTRY;
1405         spin_lock_bh(&obd->obd_processing_task_lock);
1406
1407         if (!list_empty(&obd->obd_req_replay_queue)) {
1408                 req = list_entry(obd->obd_req_replay_queue.next,
1409                                  struct ptlrpc_request, rq_list);
1410                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1411         } else {
1412                 req_transno = 0;
1413         }
1414
1415         max = obd->obd_max_recoverable_clients;
1416         connected = obd->obd_connected_clients;
1417         completed = connected - obd->obd_recoverable_clients;
1418         queue_len = obd->obd_requests_queued_for_recovery;
1419         next_transno = obd->obd_next_recovery_transno;
1420
1421         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1422                "req_transno: "LPU64", next_transno: "LPU64"\n",
1423                max, connected, completed, queue_len, req_transno, next_transno);
1424
1425         if (obd->obd_abort_recovery) {
1426                 CDEBUG(D_HA, "waking for aborted recovery\n");
1427                 wake_up = 1;
1428         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1429                 CDEBUG(D_HA, "waking for completed recovery\n");
1430                 wake_up = 1;
1431         } else if (req_transno == next_transno) {
1432                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1433                 wake_up = 1;
1434         } else if (queue_len + completed == max) {
1435                 /* handle gaps occured due to lost reply. It is allowed gaps
1436                  * because all clients are connected and there will be resend
1437                  * for missed transaction */
1438                 LASSERTF(req_transno >= next_transno,
1439                          "req_transno: "LPU64", next_transno: "LPU64"\n",
1440                          req_transno, next_transno);
1441
1442                 CDEBUG(req_transno > obd->obd_last_committed ? D_ERROR : D_HA,
1443                        "waking for skipped transno (skip: "LPD64
1444                        ", ql: %d, comp: %d, conn: %d, next: "LPD64")\n",
1445                        next_transno, queue_len, completed, connected, req_transno);
1446                 obd->obd_next_recovery_transno = req_transno;
1447                 wake_up = 1;
1448         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1449                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1450                        " by fail_lock, waking up ("LPD64")\n", next_transno);
1451                 obd->obd_next_recovery_transno = req_transno;
1452                 wake_up = 1;
1453         } else if (queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1454                 /* some clients haven't connected in time, but we can try
1455                  * to replay requests that demand on already committed ones
1456                  * also, we can replay first non-committed transation */
1457                 LASSERT(req_transno != 0);
1458                 if (req_transno == obd->obd_last_committed + 1) {
1459                         obd->obd_next_recovery_transno = req_transno;
1460                 } else if (req_transno > obd->obd_last_committed) {
1461                         /* can't continue recovery: have no needed transno */
1462                         obd->obd_abort_recovery = 1;
1463                         CDEBUG(D_ERROR, "abort due to missed clients. max: %d, "
1464                                "connected: %d, completed: %d, queue_len: %d, "
1465                                "req_transno: "LPU64", next_transno: "LPU64"\n",
1466                                max, connected, completed, queue_len,
1467                                req_transno, next_transno);
1468                 }
1469                 wake_up = 1;
1470         }
1471
1472         spin_unlock_bh(&obd->obd_processing_task_lock);
1473         return wake_up;
1474 }
1475
1476 static struct ptlrpc_request *target_next_replay_req(struct obd_device *obd)
1477 {
1478         struct l_wait_info lwi = { 0 };
1479         struct ptlrpc_request *req;
1480
1481         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1482                obd->obd_next_recovery_transno);
1483         l_wait_event(obd->obd_next_transno_waitq,
1484                      check_for_next_transno(obd), &lwi);
1485
1486         spin_lock_bh(&obd->obd_processing_task_lock);
1487         if (obd->obd_abort_recovery) {
1488                 req = NULL;
1489         } else if (!list_empty(&obd->obd_req_replay_queue)) {
1490                 req = list_entry(obd->obd_req_replay_queue.next,
1491                                  struct ptlrpc_request, rq_list);
1492                 target_exp_dequeue_req_replay(req);
1493                 list_del_init(&req->rq_list);
1494                 obd->obd_requests_queued_for_recovery--;
1495         } else {
1496                 req = NULL;
1497         }
1498         spin_unlock_bh(&obd->obd_processing_task_lock);
1499         RETURN(req);
1500 }
1501
1502 static int check_for_next_lock(struct obd_device *obd)
1503 {
1504         struct ptlrpc_request *req = NULL;
1505         int wake_up = 0;
1506
1507         spin_lock_bh(&obd->obd_processing_task_lock);
1508         if (!list_empty(&obd->obd_lock_replay_queue)) {
1509                 req = list_entry(obd->obd_lock_replay_queue.next,
1510                                  struct ptlrpc_request, rq_list);
1511                 CDEBUG(D_HA, "waking for next lock\n");
1512                 wake_up = 1;
1513         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1514                 CDEBUG(D_HA, "waking for completed lock replay\n");
1515                 wake_up = 1;
1516         } else if (obd->obd_abort_recovery) {
1517                 CDEBUG(D_HA, "waking for aborted recovery\n");
1518                 wake_up = 1;
1519         }
1520         spin_unlock_bh(&obd->obd_processing_task_lock);
1521
1522         return wake_up;
1523 }
1524
1525 static struct ptlrpc_request *target_next_replay_lock(struct obd_device *obd)
1526 {
1527         struct l_wait_info lwi = { 0 };
1528         struct ptlrpc_request *req;
1529
1530         CDEBUG(D_HA, "Waiting for lock\n");
1531         l_wait_event(obd->obd_next_transno_waitq,
1532                      check_for_next_lock(obd), &lwi);
1533
1534         spin_lock_bh(&obd->obd_processing_task_lock);
1535         if (obd->obd_abort_recovery) {
1536                 req = NULL;
1537         } else if (!list_empty(&obd->obd_lock_replay_queue)) {
1538                 req = list_entry(obd->obd_lock_replay_queue.next,
1539                                  struct ptlrpc_request, rq_list);
1540                 list_del_init(&req->rq_list);
1541         } else {
1542                 req = NULL;
1543         }
1544         spin_unlock_bh(&obd->obd_processing_task_lock);
1545         return req;
1546 }
1547
1548 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
1549 {
1550         struct ptlrpc_request *req;
1551
1552         spin_lock_bh(&obd->obd_processing_task_lock);
1553         if (!list_empty(&obd->obd_final_req_queue)) {
1554                 req = list_entry(obd->obd_final_req_queue.next,
1555                                  struct ptlrpc_request, rq_list);
1556                 list_del_init(&req->rq_list);
1557         } else {
1558                 req = NULL;
1559         }
1560         spin_unlock_bh(&obd->obd_processing_task_lock);
1561         return req;
1562 }
1563
1564 static inline int req_replay_done(struct obd_export *exp)
1565 {
1566         return (exp->exp_req_replay_needed == 0);
1567 }
1568
1569 static inline int lock_replay_done(struct obd_export *exp)
1570 {
1571         return (exp->exp_lock_replay_needed == 0);
1572 }
1573
1574 static inline int connect_done(struct obd_export *exp)
1575 {
1576         return (exp->exp_in_recovery != 0);
1577 }
1578
1579 static int check_for_clients(struct obd_device *obd)
1580 {
1581         if (obd->obd_abort_recovery)
1582                 return 1;
1583         LASSERT(obd->obd_connected_clients <= obd->obd_max_recoverable_clients);
1584         if (obd->obd_no_conn == 0 &&
1585             obd->obd_connected_clients == obd->obd_max_recoverable_clients)
1586                 return 1;
1587         return 0;
1588 }
1589
1590 static int handle_recovery_req(struct ptlrpc_thread *thread,
1591                                struct ptlrpc_request *req,
1592                                svc_handler_t handler)
1593 {
1594         int rc;
1595         ENTRY;
1596
1597         rc = lu_context_init(&req->rq_session, LCT_SESSION);
1598         if (rc) {
1599                 CERROR("Failure to initialize session: %d\n", rc);
1600                 return rc;
1601         }
1602         req->rq_session.lc_thread = thread;
1603         lu_context_enter(&req->rq_session);
1604         req->rq_svc_thread = thread;
1605         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
1606
1607         /* thread context */
1608         lu_context_enter(&thread->t_env->le_ctx);
1609         (void)handler(req);
1610         lu_context_exit(&thread->t_env->le_ctx);
1611
1612         lu_context_exit(&req->rq_session);
1613         lu_context_fini(&req->rq_session);
1614         /* don't reset timer for final stage */
1615         if (!req_replay_done(req->rq_export) ||
1616             !lock_replay_done(req->rq_export))
1617                 reset_recovery_timer(class_exp2obd(req->rq_export),
1618                        AT_OFF ? obd_timeout :
1619                        at_get(&req->rq_rqbd->rqbd_service->srv_at_estimate), 1);
1620         ptlrpc_free_clone(req);
1621         RETURN(0);
1622 }
1623
1624 static void resume_recovery_timer(struct obd_device *obd)
1625 {
1626         /* to be safe, make it at least OBD_RECOVERY_FACTOR * obd_timeout */
1627         reset_recovery_timer(obd, OBD_RECOVERY_FACTOR * obd_timeout, 1);
1628 }
1629
1630 static int target_recovery_thread(void *arg)
1631 {
1632         struct obd_device *obd = arg;
1633         struct ptlrpc_request *req;
1634         struct target_recovery_data *trd = &obd->obd_recovery_data;
1635         struct l_wait_info lwi = { 0 };
1636         unsigned long delta;
1637         unsigned long flags;
1638         struct lu_env env;
1639         struct ptlrpc_thread fake_svc_thread, *thread = &fake_svc_thread;
1640         int rc = 0;
1641         ENTRY;
1642
1643         cfs_daemonize("tgt_recov");
1644
1645         SIGNAL_MASK_LOCK(current, flags);
1646         sigfillset(&current->blocked);
1647         RECALC_SIGPENDING;
1648         SIGNAL_MASK_UNLOCK(current, flags);
1649
1650         rc = lu_context_init(&env.le_ctx, LCT_MD_THREAD);
1651         if (rc)
1652                 RETURN(rc);
1653
1654         thread->t_env = &env;
1655         env.le_ctx.lc_thread = thread;
1656
1657         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
1658                current->pid);
1659         trd->trd_processing_task = current->pid;
1660
1661         obd->obd_recovering = 1;
1662         complete(&trd->trd_starting);
1663
1664         /* first of all, we have to know the first transno to replay */
1665         obd->obd_abort_recovery = 0;
1666         l_wait_event(obd->obd_next_transno_waitq,
1667                      check_for_clients(obd), &lwi);
1668
1669         spin_lock_bh(&obd->obd_processing_task_lock);
1670         target_cancel_recovery_timer(obd);
1671         spin_unlock_bh(&obd->obd_processing_task_lock);
1672
1673         /* If some clients haven't connected in time, evict them */
1674         if (obd->obd_abort_recovery) {
1675                 CWARN("Some clients haven't connect in time (%d/%d),"
1676                        "evict them\n", obd->obd_connected_clients,
1677                        obd->obd_max_recoverable_clients);
1678                 obd->obd_abort_recovery = obd->obd_stopping;
1679                 class_disconnect_stale_exports(obd, connect_done);
1680         }
1681         /* next stage: replay requests */
1682         delta = jiffies;
1683         obd->obd_req_replaying = 1;
1684         CDEBUG(D_INFO, "1: request replay stage - %d clients from t"LPU64"\n",
1685               atomic_read(&obd->obd_req_replay_clients),
1686               obd->obd_next_recovery_transno);
1687         resume_recovery_timer(obd);
1688         while ((req = target_next_replay_req(obd))) {
1689                 LASSERT(trd->trd_processing_task == current->pid);
1690                 DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s",
1691                           lustre_msg_get_transno(req->rq_reqmsg),
1692                           libcfs_nid2str(req->rq_peer.nid));
1693                 handle_recovery_req(thread, req,
1694                                     trd->trd_recovery_handler);
1695                 obd->obd_replayed_requests++;
1696                 spin_lock_bh(&obd->obd_processing_task_lock);
1697                 obd->obd_next_recovery_transno++;
1698                 spin_unlock_bh(&obd->obd_processing_task_lock);
1699         }
1700
1701         spin_lock_bh(&obd->obd_processing_task_lock);
1702         target_cancel_recovery_timer(obd);
1703         spin_unlock_bh(&obd->obd_processing_task_lock);
1704
1705         /* If some clients haven't replayed requests in time, evict them */
1706         if (obd->obd_abort_recovery) {
1707                 CDEBUG(D_ERROR, "req replay timed out, aborting ...\n");
1708                 obd->obd_abort_recovery = obd->obd_stopping;
1709                 class_disconnect_stale_exports(obd, req_replay_done);
1710                 abort_req_replay_queue(obd);
1711         }
1712
1713         /* The second stage: replay locks */
1714         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
1715                atomic_read(&obd->obd_lock_replay_clients));
1716         resume_recovery_timer(obd);
1717         while ((req = target_next_replay_lock(obd))) {
1718                 LASSERT(trd->trd_processing_task == current->pid);
1719                 DEBUG_REQ(D_HA|D_WARNING, req, "processing lock from %s: ",
1720                           libcfs_nid2str(req->rq_peer.nid));
1721                 handle_recovery_req(thread, req,
1722                                     trd->trd_recovery_handler);
1723                 obd->obd_replayed_locks++;
1724         }
1725
1726         spin_lock_bh(&obd->obd_processing_task_lock);
1727         target_cancel_recovery_timer(obd);
1728         spin_unlock_bh(&obd->obd_processing_task_lock);
1729         /* If some clients haven't replayed requests in time, evict them */
1730         if (obd->obd_abort_recovery) {
1731                 int stale;
1732                 CERROR("lock replay timed out, aborting ...\n");
1733                 obd->obd_abort_recovery = obd->obd_stopping;
1734                 stale = class_disconnect_stale_exports(obd, lock_replay_done);
1735                 abort_lock_replay_queue(obd);
1736         }
1737
1738         /* We drop recoverying flag to forward all new requests
1739          * to regular mds_handle() since now */
1740         spin_lock_bh(&obd->obd_processing_task_lock);
1741         obd->obd_recovering = obd->obd_abort_recovery = 0;
1742         spin_unlock_bh(&obd->obd_processing_task_lock);
1743         /* The third stage: reply on final pings */
1744         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
1745         while ((req = target_next_final_ping(obd))) {
1746                 LASSERT(trd->trd_processing_task == current->pid);
1747                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
1748                           libcfs_nid2str(req->rq_peer.nid));
1749                 handle_recovery_req(thread, req,
1750                                     trd->trd_recovery_handler);
1751         }
1752
1753         delta = (jiffies - delta) / HZ;
1754         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
1755               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
1756         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
1757         LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
1758         if (delta > obd_timeout * 2) {
1759                 CWARN("too long recovery - read logs\n");
1760                 libcfs_debug_dumplog();
1761         }
1762
1763         target_finish_recovery(obd);
1764
1765         lu_context_fini(&env.le_ctx);
1766         trd->trd_processing_task = 0;
1767         complete(&trd->trd_finishing);
1768         RETURN(rc);
1769 }
1770
1771 int target_start_recovery_thread(struct obd_device *obd, svc_handler_t handler)
1772 {
1773         int rc = 0;
1774         struct target_recovery_data *trd = &obd->obd_recovery_data;
1775
1776         memset(trd, 0, sizeof(*trd));
1777         init_completion(&trd->trd_starting);
1778         init_completion(&trd->trd_finishing);
1779         trd->trd_recovery_handler = handler;
1780
1781         if (kernel_thread(target_recovery_thread, obd, 0) > 0) {
1782                 wait_for_completion(&trd->trd_starting);
1783                 LASSERT(obd->obd_recovering != 0);
1784         } else
1785                 rc = -ECHILD;
1786
1787         return rc;
1788 }
1789
1790 void target_stop_recovery_thread(struct obd_device *obd)
1791 {
1792         spin_lock_bh(&obd->obd_processing_task_lock);
1793         if (obd->obd_recovery_data.trd_processing_task > 0) {
1794                 struct target_recovery_data *trd = &obd->obd_recovery_data;
1795                 CERROR("%s: Aborting recovery\n", obd->obd_name);
1796                 obd->obd_abort_recovery = 1;
1797                 wake_up(&obd->obd_next_transno_waitq);
1798                 spin_unlock_bh(&obd->obd_processing_task_lock);
1799                 wait_for_completion(&trd->trd_finishing);
1800         } else {
1801                 spin_unlock_bh(&obd->obd_processing_task_lock);
1802         }
1803 }
1804
1805 void target_recovery_fini(struct obd_device *obd)
1806 {
1807         class_disconnect_exports(obd);
1808         target_stop_recovery_thread(obd);
1809         target_cleanup_recovery(obd);
1810 }
1811 EXPORT_SYMBOL(target_recovery_fini);
1812
1813 static void target_recovery_expired(unsigned long castmeharder)
1814 {
1815         struct obd_device *obd = (struct obd_device *)castmeharder;
1816         LCONSOLE_WARN("%s: recovery timed out; %d clients never reconnected "
1817                       "after %lds (%d clients did)\n",
1818                       obd->obd_name, obd->obd_recoverable_clients,
1819                       cfs_time_current_sec()- obd->obd_recovery_start,
1820                       obd->obd_connected_clients);
1821         spin_lock_bh(&obd->obd_processing_task_lock);
1822         if (obd->obd_recovering)
1823                 obd->obd_abort_recovery = 1;
1824         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1825         spin_unlock_bh(&obd->obd_processing_task_lock);
1826 }
1827
1828 void target_recovery_init(struct obd_device *obd, svc_handler_t handler)
1829 {
1830         if (obd->obd_max_recoverable_clients == 0)
1831                 return;
1832
1833         CWARN("RECOVERY: service %s, %d recoverable clients, "
1834               "last_transno "LPU64"\n", obd->obd_name,
1835               obd->obd_max_recoverable_clients, obd->obd_last_committed);
1836         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
1837         obd->obd_recovery_start = 0;
1838         obd->obd_recovery_end = 0;
1839         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1840         /* bz13079: this should be set to desired value for ost but not for mds */
1841         obd->obd_recovery_max_time = OBD_RECOVERY_MAX_TIME;
1842         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
1843         target_start_recovery_thread(obd, handler);
1844 }
1845 EXPORT_SYMBOL(target_recovery_init);
1846
1847 #endif
1848
1849 int target_process_req_flags(struct obd_device *obd, struct ptlrpc_request *req)
1850 {
1851         struct obd_export *exp = req->rq_export;
1852         LASSERT(exp != NULL);
1853         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1854                 /* client declares he's ready to replay locks */
1855                 spin_lock_bh(&obd->obd_processing_task_lock);
1856                 if (exp->exp_req_replay_needed) {
1857                         LASSERT(atomic_read(&obd->obd_req_replay_clients) > 0);
1858                         spin_lock(&exp->exp_lock);
1859                         exp->exp_req_replay_needed = 0;
1860                         spin_unlock(&exp->exp_lock);
1861                         atomic_dec(&obd->obd_req_replay_clients);
1862                         LASSERT(obd->obd_recoverable_clients > 0);
1863                         obd->obd_recoverable_clients--;
1864                         if (atomic_read(&obd->obd_req_replay_clients) == 0)
1865                                 CDEBUG(D_HA, "all clients have replayed reqs\n");
1866                         wake_up(&obd->obd_next_transno_waitq);
1867                 }
1868                 spin_unlock_bh(&obd->obd_processing_task_lock);
1869         }
1870         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1871                 /* client declares he's ready to complete recovery
1872                  * so, we put the request on th final queue */
1873                 spin_lock_bh(&obd->obd_processing_task_lock);
1874                 if (exp->exp_lock_replay_needed) {
1875                         LASSERT(atomic_read(&obd->obd_lock_replay_clients) > 0);
1876                         spin_lock(&exp->exp_lock);
1877                         exp->exp_lock_replay_needed = 0;
1878                         spin_unlock(&exp->exp_lock);
1879                         atomic_dec(&obd->obd_lock_replay_clients);
1880                         if (atomic_read(&obd->obd_lock_replay_clients) == 0)
1881                                 CDEBUG(D_HA, "all clients have replayed locks\n");
1882                         wake_up(&obd->obd_next_transno_waitq);
1883                 }
1884                 spin_unlock_bh(&obd->obd_processing_task_lock);
1885         }
1886
1887         return 0;
1888 }
1889
1890 int target_queue_recovery_request(struct ptlrpc_request *req,
1891                                   struct obd_device *obd)
1892 {
1893         struct list_head *tmp;
1894         int inserted = 0;
1895         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1896
1897         ENTRY;
1898
1899         if (obd->obd_recovery_data.trd_processing_task == cfs_curproc_pid()) {
1900                 /* Processing the queue right now, don't re-add. */
1901                 RETURN(1);
1902         }
1903
1904         target_process_req_flags(obd, req);
1905
1906         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1907                 /* client declares he's ready to complete recovery
1908                  * so, we put the request on th final queue */
1909                 req = ptlrpc_clone_req(req);
1910                 if (req == NULL)
1911                         RETURN(-ENOMEM);
1912                 DEBUG_REQ(D_HA, req, "queue final req");
1913                 spin_lock_bh(&obd->obd_processing_task_lock);
1914                 if (obd->obd_recovering)
1915                         list_add_tail(&req->rq_list, &obd->obd_final_req_queue);
1916                 else {
1917                         spin_unlock_bh(&obd->obd_processing_task_lock);
1918                         ptlrpc_free_clone(req);
1919                         if (obd->obd_stopping) {
1920                                 RETURN(-ENOTCONN);
1921                         } else {
1922                                 RETURN(1);
1923                         }
1924                 }
1925                 spin_unlock_bh(&obd->obd_processing_task_lock);
1926                 RETURN(0);
1927         }
1928         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1929                 /* client declares he's ready to replay locks */
1930                 req = ptlrpc_clone_req(req);
1931                 if (req == NULL)
1932                         RETURN(-ENOMEM);
1933                 DEBUG_REQ(D_HA, req, "queue lock replay req");
1934                 spin_lock_bh(&obd->obd_processing_task_lock);
1935                 LASSERT(obd->obd_recovering);
1936                 /* usually due to recovery abort */
1937                 if (!req->rq_export->exp_in_recovery) {
1938                         spin_unlock_bh(&obd->obd_processing_task_lock);
1939                         ptlrpc_free_clone(req);
1940                         RETURN(-ENOTCONN);
1941                 }
1942                 LASSERT(req->rq_export->exp_lock_replay_needed);
1943                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
1944                 spin_unlock_bh(&obd->obd_processing_task_lock);
1945                 wake_up(&obd->obd_next_transno_waitq);
1946                 RETURN(0);
1947         }
1948
1949         /* CAVEAT EMPTOR: The incoming request message has been swabbed
1950          * (i.e. buflens etc are in my own byte order), but type-dependent
1951          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
1952
1953         if (!transno) {
1954                 CFS_INIT_LIST_HEAD(&req->rq_list);
1955                 DEBUG_REQ(D_HA, req, "not queueing");
1956                 RETURN(1);
1957         }
1958
1959         spin_lock_bh(&obd->obd_processing_task_lock);
1960
1961         /* If we're processing the queue, we want don't want to queue this
1962          * message.
1963          *
1964          * Also, if this request has a transno less than the one we're waiting
1965          * for, we should process it now.  It could (and currently always will)
1966          * be an open request for a descriptor that was opened some time ago.
1967          *
1968          * Also, a resent, replayed request that has already been
1969          * handled will pass through here and be processed immediately.
1970          */
1971         CWARN("Next recovery transno: "LPU64", current: "LPU64", replaying: %i\n",
1972               obd->obd_next_recovery_transno, transno, obd->obd_req_replaying);
1973         if (transno < obd->obd_next_recovery_transno && obd->obd_req_replaying) {
1974                 /* Processing the queue right now, don't re-add. */
1975                 LASSERT(list_empty(&req->rq_list));
1976                 spin_unlock_bh(&obd->obd_processing_task_lock);
1977                 RETURN(1);
1978         }
1979         spin_unlock_bh(&obd->obd_processing_task_lock);
1980
1981         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
1982                 RETURN(0);
1983
1984         req = ptlrpc_clone_req(req);
1985         if (req == NULL)
1986                 RETURN(-ENOMEM);
1987
1988         spin_lock_bh(&obd->obd_processing_task_lock);
1989         LASSERT(obd->obd_recovering);
1990         if (!req->rq_export->exp_in_recovery) {
1991                 spin_unlock_bh(&obd->obd_processing_task_lock);
1992                 ptlrpc_free_clone(req);
1993                 RETURN(-ENOTCONN);
1994         }
1995         LASSERT(req->rq_export->exp_req_replay_needed);
1996
1997         if (target_exp_enqueue_req_replay(req)) {
1998                 spin_unlock_bh(&obd->obd_processing_task_lock);
1999                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2000                 ptlrpc_free_clone(req);
2001                 RETURN(0);
2002         }
2003
2004         /* XXX O(n^2) */
2005         list_for_each(tmp, &obd->obd_req_replay_queue) {
2006                 struct ptlrpc_request *reqiter =
2007                         list_entry(tmp, struct ptlrpc_request, rq_list);
2008
2009                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2010                         list_add_tail(&req->rq_list, &reqiter->rq_list);
2011                         inserted = 1;
2012                         break;
2013                 }
2014
2015                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2016                              transno)) {
2017                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2018                                   "has been claimed by another client");
2019                         spin_unlock_bh(&obd->obd_processing_task_lock);
2020                         target_exp_dequeue_req_replay(req);
2021                         ptlrpc_free_clone(req);
2022                         RETURN(0);
2023                 }
2024         }
2025
2026         if (!inserted)
2027                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2028
2029         obd->obd_requests_queued_for_recovery++;
2030         wake_up(&obd->obd_next_transno_waitq);
2031         spin_unlock_bh(&obd->obd_processing_task_lock);
2032         RETURN(0);
2033 }
2034
2035 struct obd_device * target_req2obd(struct ptlrpc_request *req)
2036 {
2037         return req->rq_export->exp_obd;
2038 }
2039
2040 static inline struct ldlm_pool *ldlm_exp2pl(struct obd_export *exp)
2041 {
2042         LASSERT(exp != NULL);
2043         return &exp->exp_obd->obd_namespace->ns_pool;
2044 }
2045
2046 /**
2047  * Packs current SLV and Limit into \a req.
2048  */
2049 int target_pack_pool_reply(struct ptlrpc_request *req)
2050 {
2051         struct obd_device *obd;
2052         ENTRY;
2053
2054         /*
2055          * Check that we still have all structures alive as this may
2056          * be some late rpc in shutdown time.
2057          */
2058         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2059                      !exp_connect_lru_resize(req->rq_export))) {
2060                 lustre_msg_set_slv(req->rq_repmsg, 0);
2061                 lustre_msg_set_limit(req->rq_repmsg, 0);
2062                 RETURN(0);
2063         }
2064
2065         /*
2066          * OBD is alive here as export is alive, which we checked above.
2067          */
2068         obd = req->rq_export->exp_obd;
2069
2070         read_lock(&obd->obd_pool_lock);
2071         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2072         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2073         read_unlock(&obd->obd_pool_lock);
2074
2075         RETURN(0);
2076 }
2077
2078 int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
2079 {
2080         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2081                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2082                 return (-ECOMM);
2083         }
2084
2085         if (unlikely(rc)) {
2086                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
2087                 req->rq_status = rc;
2088                 return (ptlrpc_send_error(req, 1));
2089         } else {
2090                 DEBUG_REQ(D_NET, req, "sending reply");
2091         }
2092
2093         return (ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT));
2094 }
2095
2096 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2097 {
2098         int                        netrc;
2099         struct ptlrpc_reply_state *rs;
2100         struct obd_device         *obd;
2101         struct obd_export         *exp;
2102         struct ptlrpc_service     *svc;
2103         ENTRY;
2104
2105         if (req->rq_no_reply) {
2106                 EXIT;
2107                 return;
2108         }
2109
2110         svc = req->rq_rqbd->rqbd_service;
2111         rs = req->rq_reply_state;
2112         if (rs == NULL || !rs->rs_difficult) {
2113                 /* no notifiers */
2114                 target_send_reply_msg (req, rc, fail_id);
2115                 EXIT;
2116                 return;
2117         }
2118
2119         /* must be an export if locks saved */
2120         LASSERT (req->rq_export != NULL);
2121         /* req/reply consistent */
2122         LASSERT (rs->rs_service == svc);
2123
2124         /* "fresh" reply */
2125         LASSERT (!rs->rs_scheduled);
2126         LASSERT (!rs->rs_scheduled_ever);
2127         LASSERT (!rs->rs_handled);
2128         LASSERT (!rs->rs_on_net);
2129         LASSERT (rs->rs_export == NULL);
2130         LASSERT (list_empty(&rs->rs_obd_list));
2131         LASSERT (list_empty(&rs->rs_exp_list));
2132
2133         exp = class_export_get (req->rq_export);
2134         obd = exp->exp_obd;
2135
2136         /* disable reply scheduling onto srv_reply_queue while I'm setting up */
2137         rs->rs_scheduled = 1;
2138         rs->rs_on_net    = 1;
2139         rs->rs_xid       = req->rq_xid;
2140         rs->rs_transno   = req->rq_transno;
2141         rs->rs_export    = exp;
2142
2143         spin_lock(&obd->obd_uncommitted_replies_lock);
2144
2145         CDEBUG(D_NET, "rs transno = "LPU64", last committed = "LPU64"\n",
2146                rs->rs_transno, obd->obd_last_committed);
2147         if (rs->rs_transno > obd->obd_last_committed) {
2148                 /* not committed already */
2149                 list_add_tail (&rs->rs_obd_list,
2150                                &obd->obd_uncommitted_replies);
2151         }
2152
2153         spin_unlock (&obd->obd_uncommitted_replies_lock);
2154         spin_lock (&exp->exp_lock);
2155
2156         list_add_tail (&rs->rs_exp_list, &exp->exp_outstanding_replies);
2157
2158         spin_unlock(&exp->exp_lock);
2159
2160         netrc = target_send_reply_msg (req, rc, fail_id);
2161
2162         spin_lock(&svc->srv_lock);
2163
2164         atomic_inc(&svc->srv_n_difficult_replies);
2165
2166         if (netrc != 0) {
2167                 /* error sending: reply is off the net.  Also we need +1
2168                  * reply ref until ptlrpc_server_handle_reply() is done
2169                  * with the reply state (if the send was successful, there
2170                  * would have been +1 ref for the net, which
2171                  * reply_out_callback leaves alone) */
2172                 rs->rs_on_net = 0;
2173                 ptlrpc_rs_addref(rs);
2174                 atomic_inc (&svc->srv_outstanding_replies);
2175         }
2176
2177         spin_lock(&rs->rs_lock);
2178         if (rs->rs_transno <= obd->obd_last_committed ||
2179             (!rs->rs_on_net && !rs->rs_no_ack) ||
2180              list_empty(&rs->rs_exp_list) ||     /* completed already */
2181              list_empty(&rs->rs_obd_list)) {
2182                 CDEBUG(D_HA, "Schedule reply immediately\n");
2183                 ptlrpc_dispatch_difficult_reply(rs);
2184         } else {
2185                 list_add (&rs->rs_list, &svc->srv_active_replies);
2186                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
2187         }
2188         spin_unlock(&rs->rs_lock);
2189         spin_unlock(&svc->srv_lock);
2190         EXIT;
2191 }
2192
2193 int target_handle_ping(struct ptlrpc_request *req)
2194 {
2195         obd_ping(req->rq_export);
2196         return req_capsule_server_pack(&req->rq_pill);
2197 }
2198
2199 void target_committed_to_req(struct ptlrpc_request *req)
2200 {
2201         struct obd_device *obd;
2202
2203         if (req == NULL || req->rq_export == NULL)
2204                 return;
2205
2206         obd = req->rq_export->exp_obd;
2207         if (obd == NULL)
2208                 return;
2209
2210         if (!obd->obd_no_transno && req->rq_repmsg != NULL)
2211                 lustre_msg_set_last_committed(req->rq_repmsg,
2212                                               obd->obd_last_committed);
2213         else
2214                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2215                           "%d)", obd->obd_no_transno, req->rq_repmsg == NULL);
2216
2217         CDEBUG(D_INFO, "last_committed "LPU64", transno "LPU64", xid "LPU64"\n",
2218                obd->obd_last_committed, req->rq_transno, req->rq_xid);
2219 }
2220
2221 EXPORT_SYMBOL(target_committed_to_req);
2222
2223 int target_handle_qc_callback(struct ptlrpc_request *req)
2224 {
2225         struct obd_quotactl *oqctl;
2226         struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
2227
2228         oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2229         if (oqctl == NULL) {
2230                 CERROR("Can't unpack obd_quotactl\n");
2231                 RETURN(-EPROTO);
2232         }
2233
2234         cli->cl_qchk_stat = oqctl->qc_stat;
2235
2236         return 0;
2237 }
2238
2239 #ifdef HAVE_QUOTA_SUPPORT
2240 int target_handle_dqacq_callback(struct ptlrpc_request *req)
2241 {
2242 #ifdef __KERNEL__
2243         struct obd_device *obd = req->rq_export->exp_obd;
2244         struct obd_device *master_obd;
2245         struct obd_device_target *obt;
2246         struct lustre_quota_ctxt *qctxt;
2247         struct qunit_data *qdata = NULL;
2248         int rc = 0;
2249         ENTRY;
2250
2251         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_DROP_QUOTA_REQ))
2252                 RETURN(rc);
2253
2254         rc = req_capsule_server_pack(&req->rq_pill);
2255         if (rc) {
2256                 CERROR("packing reply failed!: rc = %d\n", rc);
2257                 RETURN(rc);
2258         }
2259
2260         LASSERT(req->rq_export);
2261
2262         OBD_ALLOC(qdata, sizeof(struct qunit_data));
2263         if (!qdata)
2264                 RETURN(-ENOMEM);
2265         rc = quota_get_qdata(req, qdata, QUOTA_REQUEST, QUOTA_EXPORT);
2266         if (rc < 0) {
2267                 CDEBUG(D_ERROR, "Can't unpack qunit_data(rc: %d)\n", rc);
2268                 GOTO(out, rc);
2269         }
2270
2271         /* we use the observer */
2272         if (!obd->obd_observer || !obd->obd_observer->obd_observer) {
2273                 CERROR("Can't find the observer, it is recovering\n");
2274                 req->rq_status = -EAGAIN;
2275                 GOTO(send_reply, rc = -EAGAIN);
2276         }
2277
2278         master_obd = obd->obd_observer->obd_observer;
2279         obt = &master_obd->u.obt;
2280         qctxt = &obt->obt_qctxt;
2281
2282         if (!qctxt->lqc_setup || !qctxt->lqc_valid) {
2283                 /* quota_type has not been processed yet, return EAGAIN
2284                  * until we know whether or not quotas are supposed to
2285                  * be enabled */
2286                 CDEBUG(D_QUOTA, "quota_type not processed yet, return "
2287                        "-EAGAIN\n");
2288                 req->rq_status = -EAGAIN;
2289                 rc = ptlrpc_reply(req);
2290                 GOTO(out, rc);
2291         }
2292
2293         down_read(&obt->obt_rwsem);
2294         if (qctxt->lqc_lqs_hash == NULL) {
2295                 up_read(&obt->obt_rwsem);
2296                 /* quota_type has not been processed yet, return EAGAIN
2297                  * until we know whether or not quotas are supposed to
2298                  * be enabled */
2299                 CDEBUG(D_QUOTA, "quota_ctxt is not ready yet, return "
2300                        "-EAGAIN\n");
2301                 req->rq_status = -EAGAIN;
2302                 rc = ptlrpc_reply(req);
2303                 GOTO(out, rc);
2304         }
2305
2306         LASSERT(qctxt->lqc_handler);
2307         rc = qctxt->lqc_handler(master_obd, qdata,
2308                                 lustre_msg_get_opc(req->rq_reqmsg));
2309         up_read(&obt->obt_rwsem);
2310         if (rc && rc != -EDQUOT)
2311                 CDEBUG(rc == -EBUSY  ? D_QUOTA : D_ERROR,
2312                        "dqacq failed! (rc:%d)\n", rc);
2313         req->rq_status = rc;
2314
2315         /* there are three forms of qunit(historic causes), so we need to
2316          * adjust the same form to different forms slaves needed */
2317         rc = quota_copy_qdata(req, qdata, QUOTA_REPLY, QUOTA_EXPORT);
2318         if (rc < 0) {
2319                 CDEBUG(D_ERROR, "Can't pack qunit_data(rc: %d)\n", rc);
2320                 GOTO(out, rc);
2321         }
2322
2323         /* Block the quota req. b=14840 */
2324         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_BLOCK_QUOTA_REQ, obd_timeout);
2325 send_reply:
2326         rc = ptlrpc_reply(req);
2327 out:
2328         OBD_FREE(qdata, sizeof(struct qunit_data));
2329         RETURN(rc);
2330 #else
2331         return 0;
2332 #endif /* !__KERNEL__ */
2333 }
2334 #endif /* HAVE_QUOTA_SUPPORT */
2335
2336 ldlm_mode_t lck_compat_array[] = {
2337         [LCK_EX] LCK_COMPAT_EX,
2338         [LCK_PW] LCK_COMPAT_PW,
2339         [LCK_PR] LCK_COMPAT_PR,
2340         [LCK_CW] LCK_COMPAT_CW,
2341         [LCK_CR] LCK_COMPAT_CR,
2342         [LCK_NL] LCK_COMPAT_NL,
2343         [LCK_GROUP] LCK_COMPAT_GROUP,
2344         [LCK_COS] LCK_COMPAT_COS,
2345 };
2346
2347 /**
2348  * Rather arbitrary mapping from LDLM error codes to errno values. This should
2349  * not escape to the user level.
2350  */
2351 int ldlm_error2errno(ldlm_error_t error)
2352 {
2353         int result;
2354
2355         switch (error) {
2356         case ELDLM_OK:
2357                 result = 0;
2358                 break;
2359         case ELDLM_LOCK_CHANGED:
2360                 result = -ESTALE;
2361                 break;
2362         case ELDLM_LOCK_ABORTED:
2363                 result = -ENAVAIL;
2364                 break;
2365         case ELDLM_LOCK_REPLACED:
2366                 result = -ESRCH;
2367                 break;
2368         case ELDLM_NO_LOCK_DATA:
2369                 result = -ENOENT;
2370                 break;
2371         case ELDLM_NAMESPACE_EXISTS:
2372                 result = -EEXIST;
2373                 break;
2374         case ELDLM_BAD_NAMESPACE:
2375                 result = -EBADF;
2376                 break;
2377         default:
2378                 if (((int)error) < 0)  /* cast to signed type */
2379                         result = error; /* as ldlm_error_t can be unsigned */
2380                 else {
2381                         CERROR("Invalid DLM result code: %i\n", error);
2382                         result = -EPROTO;
2383                 }
2384         }
2385         return result;
2386 }
2387 EXPORT_SYMBOL(ldlm_error2errno);
2388
2389 /**
2390  * Dual to ldlm_error2errno(): maps errno values back to ldlm_error_t.
2391  */
2392 ldlm_error_t ldlm_errno2error(int err_no)
2393 {
2394         int error;
2395
2396         switch (err_no) {
2397         case 0:
2398                 error = ELDLM_OK;
2399                 break;
2400         case -ESTALE:
2401                 error = ELDLM_LOCK_CHANGED;
2402                 break;
2403         case -ENAVAIL:
2404                 error = ELDLM_LOCK_ABORTED;
2405                 break;
2406         case -ESRCH:
2407                 error = ELDLM_LOCK_REPLACED;
2408                 break;
2409         case -ENOENT:
2410                 error = ELDLM_NO_LOCK_DATA;
2411                 break;
2412         case -EEXIST:
2413                 error = ELDLM_NAMESPACE_EXISTS;
2414                 break;
2415         case -EBADF:
2416                 error = ELDLM_BAD_NAMESPACE;
2417                 break;
2418         default:
2419                 error = err_no;
2420         }
2421         return error;
2422 }
2423 EXPORT_SYMBOL(ldlm_errno2error);
2424