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