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
  55 /* @priority: if non-zero, move the selected to the list head
  56  * @create: if zero, only search in existed connections
  57  */
  58 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  59                            int priority, int create)
  60 {
  61         struct ptlrpc_connection *ptlrpc_conn;
  62         struct obd_import_conn *imp_conn = NULL, *item;
  63         int rc = 0;
  64         ENTRY;
  65
  66         if (!create && !priority) {
  67                 CDEBUG(D_HA, "Nothing to do\n");
  68                 RETURN(-EINVAL);
  69         }
  70
  71         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
  72         if (!ptlrpc_conn) {
  73                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  74                 RETURN (-ENOENT);
  75         }
  76
  77         if (create) {
  78                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  79                 if (!imp_conn) {
  80                         GOTO(out_put, rc = -ENOMEM);
  81                 }
  82         }
  83
  84         spin_lock(&imp->imp_lock);
  85         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  86                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  87                         if (priority) {
  88                                 list_del(&item->oic_item);
  89                                 list_add(&item->oic_item, &imp->imp_conn_list);
  90                                 item->oic_last_attempt = 0;
  91                         }
  92                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  93                                imp, imp->imp_obd->obd_name, uuid->uuid,
  94                                (priority ? ", moved to head" : ""));
  95                         spin_unlock(&imp->imp_lock);
  96                         GOTO(out_free, rc = 0);
  97                 }
  98         }
  99         /* not found */
 100         if (create) {
 101                 imp_conn->oic_conn = ptlrpc_conn;
 102                 imp_conn->oic_uuid = *uuid;
 103                 item->oic_last_attempt = 0;
 104                 if (priority)
 105                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 106                 else
 107                         list_add_tail(&imp_conn->oic_item, &imp->imp_conn_list);
 108                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 109                        imp, imp->imp_obd->obd_name, uuid->uuid,
 110                        (priority ? "head" : "tail"));
 111         } else {
 112                 spin_unlock(&imp->imp_lock);
 113                 GOTO(out_free, rc = -ENOENT);
 114         }
 115
 116         spin_unlock(&imp->imp_lock);
 117         RETURN(0);
 118 out_free:
 119         if (imp_conn)
 120                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 121 out_put:
 122         ptlrpc_put_connection(ptlrpc_conn);
 123         RETURN(rc);
 124 }
 125
 126 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 127 {
 128         return import_set_conn(imp, uuid, 1, 0);
 129 }
 130
 131 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 132                            int priority)
 133 {
 134         return import_set_conn(imp, uuid, priority, 1);
 135 }
 136
 137 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 138 {
 139         struct obd_import_conn *imp_conn;
 140         struct obd_export *dlmexp;
 141         int rc = -ENOENT;
 142         ENTRY;
 143
 144         spin_lock(&imp->imp_lock);
 145         if (list_empty(&imp->imp_conn_list)) {
 146                 LASSERT(!imp->imp_connection);
 147                 GOTO(out, rc);
 148         }
 149
 150         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 151                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 152                         continue;
 153                 LASSERT(imp_conn->oic_conn);
 154
 155                 /* is current conn? */
 156                 if (imp_conn == imp->imp_conn_current) {
 157                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 158
 159                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 160                             imp->imp_state != LUSTRE_IMP_DISCON) {
 161                                 CERROR("can't remove current connection\n");
 162                                 GOTO(out, rc = -EBUSY);
 163                         }
 164
 165                         ptlrpc_put_connection(imp->imp_connection);
 166                         imp->imp_connection = NULL;
 167
 168                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 169                         if (dlmexp && dlmexp->exp_connection) {
 170                                 LASSERT(dlmexp->exp_connection ==
 171                                         imp_conn->oic_conn);
 172                                 ptlrpc_put_connection(dlmexp->exp_connection);
 173                                 dlmexp->exp_connection = NULL;
 174                         }
 175                 }
 176
 177                 list_del(&imp_conn->oic_item);
 178                 ptlrpc_put_connection(imp_conn->oic_conn);
 179                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 180                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 181                        imp, imp->imp_obd->obd_name, uuid->uuid);
 182                 rc = 0;
 183                 break;
 184         }
 185 out:
 186         spin_unlock(&imp->imp_lock);
 187         if (rc == -ENOENT)
 188                 CERROR("connection %s not found\n", uuid->uuid);
 189         RETURN(rc);
 190 }
 191
 192 static void destroy_import(struct obd_import *imp)
 193 {
 194         /* drop security policy instance after all rpc finished/aborted
 195          * to let all busy contexts be released. */
 196         class_import_get(imp);
 197         class_destroy_import(imp);
 198         sptlrpc_import_sec_put(imp);
 199         class_import_put(imp);
 200 }
 201
 202 /* configure an RPC client OBD device
 203  *
 204  * lcfg parameters:
 205  * 1 - client UUID
 206  * 2 - server UUID
 207  * 3 - inactive-on-startup
 208  */
 209 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 210 {
 211         struct client_obd *cli = &obddev->u.cli;
 212         struct obd_import *imp;
 213         struct obd_uuid server_uuid;
 214         int rq_portal, rp_portal, connect_op;
 215         char *name = obddev->obd_type->typ_name;
 216         int rc;
 217         ENTRY;
 218
 219         /* In a more perfect world, we would hang a ptlrpc_client off of
 220          * obd_type and just use the values from there. */
 221         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 222                 rq_portal = OST_REQUEST_PORTAL;
 223                 rp_portal = OSC_REPLY_PORTAL;
 224                 connect_op = OST_CONNECT;
 225         } else if (!strcmp(name, LUSTRE_MDC_NAME)) {
 226                 rq_portal = MDS_REQUEST_PORTAL;
 227                 rp_portal = MDC_REPLY_PORTAL;
 228                 connect_op = MDS_CONNECT;
 229         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 230                 rq_portal = MGS_REQUEST_PORTAL;
 231                 rp_portal = MGC_REPLY_PORTAL;
 232                 connect_op = MGS_CONNECT;
 233         } else {
 234                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 235                        name);
 236                 RETURN(-EINVAL);
 237         }
 238
 239         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 240                 CERROR("requires a TARGET UUID\n");
 241                 RETURN(-EINVAL);
 242         }
 243
 244         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 245                 CERROR("client UUID must be less than 38 characters\n");
 246                 RETURN(-EINVAL);
 247         }
 248
 249         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 250                 CERROR("setup requires a SERVER UUID\n");
 251                 RETURN(-EINVAL);
 252         }
 253
 254         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 255                 CERROR("target UUID must be less than 38 characters\n");
 256                 RETURN(-EINVAL);
 257         }
 258
 259         init_rwsem(&cli->cl_sem);
 260         sema_init(&cli->cl_mgc_sem, 1);
 261         sptlrpc_rule_set_init(&cli->cl_sptlrpc_rset);
 262         cli->cl_sec_part = LUSTRE_SP_ANY;
 263         cli->cl_conn_count = 0;
 264         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 265                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 266                      sizeof(server_uuid)));
 267
 268         cli->cl_dirty = 0;
 269         cli->cl_avail_grant = 0;
 270         /* FIXME: should limit this for the sum of all cl_dirty_max */
 271         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 272         if (cli->cl_dirty_max >> CFS_PAGE_SHIFT > num_physpages / 8)
 273                 cli->cl_dirty_max = num_physpages << (CFS_PAGE_SHIFT - 3);
 274         CFS_INIT_LIST_HEAD(&cli->cl_cache_waiters);
 275         CFS_INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 276         CFS_INIT_LIST_HEAD(&cli->cl_loi_write_list);
 277         CFS_INIT_LIST_HEAD(&cli->cl_loi_read_list);
 278         client_obd_list_lock_init(&cli->cl_loi_list_lock);
 279         cli->cl_r_in_flight = 0;
 280         cli->cl_w_in_flight = 0;
 281
 282         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 283         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 284         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 285         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 286         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 287         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 288         cfs_waitq_init(&cli->cl_destroy_waitq);
 289         atomic_set(&cli->cl_destroy_in_flight, 0);
 290 #ifdef ENABLE_CHECKSUM
 291         /* Turn on checksumming by default. */
 292         cli->cl_checksum = 1;
 293         /*
 294          * The supported checksum types will be worked out at connect time
 295          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 296          * through procfs.
 297          */
 298         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 299 #endif
 300         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 301
 302         /* This value may be changed at connect time in
 303            ptlrpc_connect_interpret. */
 304         cli->cl_max_pages_per_rpc = min((int)PTLRPC_MAX_BRW_PAGES,
 305                                         (int)(1024 * 1024 >> CFS_PAGE_SHIFT));
 306
 307         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 308                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
 309         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 128 /* MB */) {
 310                 cli->cl_max_rpcs_in_flight = 2;
 311         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 256 /* MB */) {
 312                 cli->cl_max_rpcs_in_flight = 3;
 313         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 512 /* MB */) {
 314                 cli->cl_max_rpcs_in_flight = 4;
 315         } else {
 316                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 317         }
 318
 319         rc = ldlm_get_ref();
 320         if (rc) {
 321                 CERROR("ldlm_get_ref failed: %d\n", rc);
 322                 GOTO(err, rc);
 323         }
 324
 325         ptlrpc_init_client(rq_portal, rp_portal, name,
 326                            &obddev->obd_ldlm_client);
 327
 328         imp = class_new_import(obddev);
 329         if (imp == NULL)
 330                 GOTO(err_ldlm, rc = -ENOENT);
 331         imp->imp_client = &obddev->obd_ldlm_client;
 332         imp->imp_connect_op = connect_op;
 333         imp->imp_initial_recov = 1;
 334         imp->imp_initial_recov_bk = 0;
 335         CFS_INIT_LIST_HEAD(&imp->imp_pinger_chain);
 336         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 337                LUSTRE_CFG_BUFLEN(lcfg, 1));
 338         class_import_put(imp);
 339
 340         rc = client_import_add_conn(imp, &server_uuid, 1);
 341         if (rc) {
 342                 CERROR("can't add initial connection\n");
 343                 GOTO(err_import, rc);
 344         }
 345
 346         cli->cl_import = imp;
 347         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 348         cli->cl_max_mds_easize = sizeof(struct lov_mds_md);
 349         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 350
 351         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 352                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 353                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 354                                name, obddev->obd_name,
 355                                cli->cl_target_uuid.uuid);
 356                         spin_lock(&imp->imp_lock);
 357                         imp->imp_invalid = 1;
 358                         spin_unlock(&imp->imp_lock);
 359                 }
 360         }
 361
 362         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 363
 364         RETURN(rc);
 365
 366 err_import:
 367         class_destroy_import(imp);
 368 err_ldlm:
 369         ldlm_put_ref();
 370 err:
 371         RETURN(rc);
 372
 373 }
 374
 375 int client_obd_cleanup(struct obd_device *obddev)
 376 {
 377         ENTRY;
 378         sptlrpc_rule_set_free(&obddev->u.cli.cl_sptlrpc_rset);
 379         ldlm_put_ref();
 380         RETURN(0);
 381 }
 382
 383 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 384 int client_connect_import(const struct lu_env *env,
 385                           struct lustre_handle *dlm_handle,
 386                           struct obd_device *obd, struct obd_uuid *cluuid,
 387                           struct obd_connect_data *data, void *localdata)
 388 {
 389         struct client_obd *cli = &obd->u.cli;
 390         struct obd_import *imp = cli->cl_import;
 391         struct obd_export *exp;
 392         struct obd_connect_data *ocd;
 393         struct ldlm_namespace *to_be_freed = NULL;
 394         int rc;
 395         ENTRY;
 396
 397         down_write(&cli->cl_sem);
 398         rc = class_connect(dlm_handle, obd, cluuid);
 399         if (rc)
 400                 GOTO(out_sem, rc);
 401
 402         cli->cl_conn_count++;
 403         if (cli->cl_conn_count > 1)
 404                 GOTO(out_sem, rc);
 405         exp = class_conn2export(dlm_handle);
 406
 407         if (obd->obd_namespace != NULL)
 408                 CERROR("already have namespace!\n");
 409         obd->obd_namespace = ldlm_namespace_new(obd, obd->obd_name,
 410                                                 LDLM_NAMESPACE_CLIENT,
 411                                                 LDLM_NAMESPACE_GREEDY);
 412         if (obd->obd_namespace == NULL)
 413                 GOTO(out_disco, rc = -ENOMEM);
 414
 415         imp->imp_dlm_handle = *dlm_handle;
 416         rc = ptlrpc_init_import(imp);
 417         if (rc != 0)
 418                 GOTO(out_ldlm, rc);
 419
 420         ocd = &imp->imp_connect_data;
 421         if (data) {
 422                 *ocd = *data;
 423                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 424         }
 425
 426         rc = ptlrpc_connect_import(imp, NULL);
 427         if (rc != 0) {
 428                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 429                 GOTO(out_ldlm, rc);
 430         }
 431         LASSERT(exp->exp_connection);
 432
 433         if (data) {
 434                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 435                          ocd->ocd_connect_flags, "old "LPX64", new "LPX64"\n",
 436                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 437                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 438         }
 439
 440         ptlrpc_pinger_add_import(imp);
 441
 442         EXIT;
 443
 444         if (rc) {
 445 out_ldlm:
 446                 ldlm_namespace_free_prior(obd->obd_namespace, imp, 0);
 447                 to_be_freed = obd->obd_namespace;
 448                 obd->obd_namespace = NULL;
 449 out_disco:
 450                 cli->cl_conn_count--;
 451                 class_disconnect(exp);
 452         } else {
 453                 class_export_put(exp);
 454         }
 455 out_sem:
 456         up_write(&cli->cl_sem);
 457         if (to_be_freed)
 458                 ldlm_namespace_free_post(to_be_freed);
 459
 460         return rc;
 461 }
 462
 463 int client_disconnect_export(struct obd_export *exp)
 464 {
 465         struct obd_device *obd = class_exp2obd(exp);
 466         struct client_obd *cli;
 467         struct obd_import *imp;
 468         int rc = 0, err;
 469         struct ldlm_namespace *to_be_freed = NULL;
 470         ENTRY;
 471
 472         if (!obd) {
 473                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 474                        exp, exp ? exp->exp_handle.h_cookie : -1);
 475                 RETURN(-EINVAL);
 476         }
 477
 478         cli = &obd->u.cli;
 479         imp = cli->cl_import;
 480
 481         down_write(&cli->cl_sem);
 482         if (!cli->cl_conn_count) {
 483                 CERROR("disconnecting disconnected device (%s)\n",
 484                        obd->obd_name);
 485                 GOTO(out_sem, rc = -EINVAL);
 486         }
 487
 488         cli->cl_conn_count--;
 489         if (cli->cl_conn_count)
 490                 GOTO(out_no_disconnect, rc = 0);
 491
 492         /* Mark import deactivated now, so we don't try to reconnect if any
 493          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
 494          * fully deactivate the import, or that would drop all requests. */
 495         spin_lock(&imp->imp_lock);
 496         imp->imp_deactive = 1;
 497         spin_unlock(&imp->imp_lock);
 498
 499         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 500          * delete it regardless.  (It's safe to delete an import that was
 501          * never added.) */
 502         (void)ptlrpc_pinger_del_import(imp);
 503
 504         if (obd->obd_namespace != NULL) {
 505                 /* obd_force == local only */
 506                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 507                                        obd->obd_force ? LDLM_FL_LOCAL_ONLY:0,
 508                                        NULL);
 509                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 510                 to_be_freed = obd->obd_namespace;
 511         }
 512
 513         rc = ptlrpc_disconnect_import(imp, 0);
 514
 515         ptlrpc_invalidate_import(imp);
 516         /* set obd_namespace to NULL only after invalidate, because we can have
 517          * some connect requests in flight, and his need store a connect flags
 518          * in obd_namespace. bug 14260 */
 519         obd->obd_namespace = NULL;
 520
 521         ptlrpc_free_rq_pool(imp->imp_rq_pool);
 522         destroy_import(imp);
 523         cli->cl_import = NULL;
 524
 525         EXIT;
 526  out_no_disconnect:
 527         err = class_disconnect(exp);
 528         if (!rc && err)
 529                 rc = err;
 530  out_sem:
 531         up_write(&cli->cl_sem);
 532         if (to_be_freed)
 533                 ldlm_namespace_free_post(to_be_freed);
 534
 535         RETURN(rc);
 536 }
 537
 538 /* --------------------------------------------------------------------------
 539  * from old lib/target.c
 540  * -------------------------------------------------------------------------- */
 541
 542 int target_handle_reconnect(struct lustre_handle *conn, struct obd_export *exp,
 543                             struct obd_uuid *cluuid, int initial_conn)
 544 {
 545         ENTRY;
 546         if (exp->exp_connection && exp->exp_imp_reverse && !initial_conn) {
 547                 struct lustre_handle *hdl;
 548                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 549                 /* Might be a re-connect after a partition. */
 550                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 551                         CWARN("%s: %s reconnecting\n", exp->exp_obd->obd_name,
 552                               cluuid->uuid);
 553                         conn->cookie = exp->exp_handle.h_cookie;
 554                         /* target_handle_connect() treats EALREADY and
 555                          * -EALREADY differently.  EALREADY means we are
 556                          * doing a valid reconnect from the same client. */
 557                         RETURN(EALREADY);
 558                 } else {
 559                         CERROR("%s reconnecting from %s, "
 560                                "handle mismatch (ours "LPX64", theirs "
 561                                LPX64")\n", cluuid->uuid,
 562                                exp->exp_connection->c_remote_uuid.uuid,
 563                                hdl->cookie, conn->cookie);
 564                         memset(conn, 0, sizeof *conn);
 565                         /* target_handle_connect() treats EALREADY and
 566                          * -EALREADY differently.  -EALREADY is an error
 567                          * (same UUID, different handle). */
 568                         RETURN(-EALREADY);
 569                 }
 570         }
 571
 572         conn->cookie = exp->exp_handle.h_cookie;
 573         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
 574                cluuid->uuid, exp, conn->cookie);
 575         RETURN(0);
 576 }
 577
 578 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
 579                           int error)
 580 {
 581         struct obd_export *exp = cb_data;
 582
 583         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 584                obd->obd_name, exp->exp_client_uuid.uuid);
 585
 586         spin_lock(&exp->exp_lock);
 587         exp->exp_need_sync = 0;
 588         spin_unlock(&exp->exp_lock);
 589 }
 590 EXPORT_SYMBOL(target_client_add_cb);
 591 static void
 592 target_start_and_reset_recovery_timer(struct obd_device *obd,
 593                                       struct ptlrpc_request *req,
 594                                       int new_client);
 595
 596 int target_handle_connect(struct ptlrpc_request *req)
 597 {
 598         struct obd_device *target, *targref = NULL;
 599         struct obd_export *export = NULL;
 600         struct obd_import *revimp;
 601         struct lustre_handle conn;
 602         struct lustre_handle *tmp;
 603         struct obd_uuid tgtuuid;
 604         struct obd_uuid cluuid;
 605         struct obd_uuid remote_uuid;
 606         char *str;
 607         int rc = 0;
 608         int initial_conn = 0;
 609         struct obd_connect_data *data, *tmpdata;
 610         lnet_nid_t *client_nid = NULL;
 611         ENTRY;
 612
 613         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 614
 615         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 616         if (str == NULL) {
 617                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 618                 GOTO(out, rc = -EINVAL);
 619         }
 620
 621         obd_str2uuid(&tgtuuid, str);
 622         target = class_uuid2obd(&tgtuuid);
 623         if (!target)
 624                 target = class_name2obd(str);
 625
 626         if (!target || target->obd_stopping || !target->obd_set_up) {
 627                 LCONSOLE_ERROR_MSG(0x137, "UUID '%s' is not available "
 628                                    " for connect (%s)\n", str,
 629                                    !target ? "no target" :
 630                                    (target->obd_stopping ? "stopping" :
 631                                    "not set up"));
 632                 GOTO(out, rc = -ENODEV);
 633         }
 634
 635         if (target->obd_no_conn) {
 636                 LCONSOLE_WARN("%s: temporarily refusing client connection "
 637                               "from %s\n", target->obd_name,
 638                               libcfs_nid2str(req->rq_peer.nid));
 639                 GOTO(out, rc = -EAGAIN);
 640         }
 641
 642         /* Make sure the target isn't cleaned up while we're here. Yes,
 643            there's still a race between the above check and our incref here.
 644            Really, class_uuid2obd should take the ref. */
 645         targref = class_incref(target);
 646
 647
 648         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
 649         if (str == NULL) {
 650                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
 651                 GOTO(out, rc = -EINVAL);
 652         }
 653
 654         obd_str2uuid(&cluuid, str);
 655
 656         /* XXX extract a nettype and format accordingly */
 657         switch (sizeof(lnet_nid_t)) {
 658                 /* NB the casts only avoid compiler warnings */
 659         case 8:
 660                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 661                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
 662                 break;
 663         case 4:
 664                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 665                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
 666                 break;
 667         default:
 668                 LBUG();
 669         }
 670
 671         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 672         if (tmp == NULL)
 673                 GOTO(out, rc = -EPROTO);
 674
 675         conn = *tmp;
 676
 677         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 678         if (!data)
 679                 GOTO(out, rc = -EPROTO);
 680
 681         rc = req_capsule_server_pack(&req->rq_pill);
 682         if (rc)
 683                 GOTO(out, rc);
 684
 685         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 686                 if (!data) {
 687                         DEBUG_REQ(D_WARNING, req, "Refusing old (unversioned) "
 688                                   "libclient connection attempt");
 689                         GOTO(out, rc = -EPROTO);
 690                 } else if (data->ocd_version < LUSTRE_VERSION_CODE -
 691                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
 692                            data->ocd_version > LUSTRE_VERSION_CODE +
 693                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
 694                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
 695                                   "libclient connection attempt",
 696                                   data->ocd_version < LUSTRE_VERSION_CODE ?
 697                                   "old" : "new",
 698                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
 699                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
 700                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
 701                                   OBD_OCD_VERSION_FIX(data->ocd_version));
 702                         data = req_capsule_server_sized_get(&req->rq_pill,
 703                                                         &RMF_CONNECT_DATA,
 704                                     offsetof(typeof(*data), ocd_version) +
 705                                              sizeof(data->ocd_version));
 706                         if (data) {
 707                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
 708                                 data->ocd_version = LUSTRE_VERSION_CODE;
 709                         }
 710                         GOTO(out, rc = -EPROTO);
 711                 }
 712         }
 713
 714         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL)
 715                 initial_conn = 1;
 716
 717         /* lctl gets a backstage, all-access pass. */
 718         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 719                 goto dont_check_exports;
 720
 721         spin_lock(&target->obd_dev_lock);
 722         export = lustre_hash_get_object_by_key(target->obd_uuid_hash_body, &cluuid);
 723
 724         if (export != NULL && export->exp_connecting) { /* bug 9635, et. al. */
 725                 CWARN("%s: exp %p already connecting\n",
 726                       export->exp_obd->obd_name, export);
 727                 class_export_put(export);
 728                 export = NULL;
 729                 rc = -EALREADY;
 730         } else if (export != NULL && export->exp_connection != NULL &&
 731                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
 732                 /* make darn sure this is coming from the same peer
 733                  * if the UUIDs matched */
 734                   CWARN("%s: cookie %s seen on new NID %s when "
 735                           "existing NID %s is already connected\n",
 736                         target->obd_name, cluuid.uuid,
 737                   libcfs_nid2str(req->rq_peer.nid),
 738                   libcfs_nid2str(export->exp_connection->c_peer.nid));
 739                   class_export_put(export);
 740                   export = NULL;
 741                   rc = -EALREADY;
 742         } else if (export != NULL) {
 743                 spin_lock(&export->exp_lock);
 744                 export->exp_connecting = 1;
 745                 spin_unlock(&export->exp_lock);
 746                 class_export_put(export);
 747                 spin_unlock(&target->obd_dev_lock);
 748                 LASSERT(export->exp_obd == target);
 749
 750                 rc = target_handle_reconnect(&conn, export, &cluuid, initial_conn);
 751         }
 752
 753         /* If we found an export, we already unlocked. */
 754         if (!export) {
 755                 spin_unlock(&target->obd_dev_lock);
 756                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
 757         } else if (req->rq_export == NULL &&
 758                    atomic_read(&export->exp_rpc_count) > 0) {
 759                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
 760                       target->obd_name, cluuid.uuid,
 761                       libcfs_nid2str(req->rq_peer.nid),
 762                       export, atomic_read(&export->exp_refcount));
 763                 GOTO(out, rc = -EBUSY);
 764         } else if (req->rq_export != NULL &&
 765                    (atomic_read(&export->exp_rpc_count) > 1)) {
 766                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
 767                       target->obd_name, cluuid.uuid,
 768                       libcfs_nid2str(req->rq_peer.nid),
 769                       export, atomic_read(&export->exp_rpc_count));
 770                 GOTO(out, rc = -EBUSY);
 771         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1 &&
 772                    !initial_conn) {
 773                 CERROR("%s: NID %s (%s) reconnected with 1 conn_cnt; "
 774                        "cookies not random?\n", target->obd_name,
 775                        libcfs_nid2str(req->rq_peer.nid), cluuid.uuid);
 776                 GOTO(out, rc = -EALREADY);
 777         } else {
 778                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
 779                 if (req->rq_export == NULL && initial_conn)
 780                        export->exp_last_request_time =
 781                                max(export->exp_last_request_time,
 782                                    (time_t)cfs_time_current_sec());
 783         }
 784
 785         if (rc < 0) {
 786                 GOTO(out, rc);
 787         }
 788
 789         CWARN("%s: connection from %s@%s %st"LPU64" exp %p cur %ld last %ld\n",
 790                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 791               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
 792               export, (long)cfs_time_current_sec(),
 793               export ? (long)export->exp_last_request_time : 0);
 794
 795         /* Tell the client if we're in recovery. */
 796         if (target->obd_recovering) {
 797                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 798                 /* If this is the first time a client connects,
 799                    reset the recovery timer */
 800                 if (rc == 0)
 801                         target_start_and_reset_recovery_timer(target, req,
 802                                                               !export);
 803         }
 804
 805         /* We want to handle EALREADY but *not* -EALREADY from
 806          * target_handle_reconnect(), return reconnection state in a flag */
 807         if (rc == EALREADY) {
 808                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 809                 rc = 0;
 810         } else {
 811                 LASSERT(rc == 0);
 812         }
 813
 814         /* Tell the client if we support replayable requests */
 815         if (target->obd_replayable)
 816                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 817         client_nid = &req->rq_peer.nid;
 818
 819         if (export == NULL) {
 820                 if (target->obd_recovering) {
 821                         cfs_time_t t;
 822
 823                         t = cfs_timer_deadline(&target->obd_recovery_timer);
 824                         t = cfs_time_sub(t, cfs_time_current());
 825                         CERROR("%s: denying connection for new client %s (%s): "
 826                                "%d clients in recovery for "CFS_TIME_T"s\n",
 827                                target->obd_name,
 828                                libcfs_nid2str(req->rq_peer.nid), cluuid.uuid,
 829                                target->obd_recoverable_clients,
 830                                cfs_duration_sec(t));
 831                         rc = -EBUSY;
 832                 } else {
 833 dont_check_exports:
 834                         rc = obd_connect(req->rq_svc_thread->t_env,
 835                                          &conn, target, &cluuid, data,
 836                                          client_nid);
 837                 }
 838         } else {
 839                 rc = obd_reconnect(req->rq_svc_thread->t_env,
 840                                    export, target, &cluuid, data);
 841         }
 842         if (rc)
 843                 GOTO(out, rc);
 844         /* Return only the parts of obd_connect_data that we understand, so the
 845          * client knows that we don't understand the rest. */
 846         if (data) {
 847                  tmpdata = req_capsule_server_get(&req->rq_pill,
 848                                                   &RMF_CONNECT_DATA);
 849                   //data->ocd_connect_flags &= OBD_CONNECT_SUPPORTED;
 850                  *tmpdata = *data;
 851         }
 852
 853         /* If all else goes well, this is our RPC return code. */
 854         req->rq_status = 0;
 855
 856         lustre_msg_set_handle(req->rq_repmsg, &conn);
 857
 858         /* ownership of this export ref transfers to the request AFTER we
 859          * drop any previous reference the request had, but we don't want
 860          * that to go to zero before we get our new export reference. */
 861         export = class_conn2export(&conn);
 862         if (!export) {
 863                 DEBUG_REQ(D_ERROR, req, "Missing export!");
 864                 GOTO(out, rc = -ENODEV);
 865         }
 866
 867         /* If the client and the server are the same node, we will already
 868          * have an export that really points to the client's DLM export,
 869          * because we have a shared handles table.
 870          *
 871          * XXX this will go away when shaver stops sending the "connect" handle
 872          * in the real "remote handle" field of the request --phik 24 Apr 2003
 873          */
 874         if (req->rq_export != NULL)
 875                 class_export_put(req->rq_export);
 876
 877         req->rq_export = export;
 878
 879         spin_lock(&export->exp_lock);
 880         if (initial_conn) {
 881                 lustre_msg_set_conn_cnt(req->rq_repmsg, export->exp_conn_cnt + 1);
 882         } else if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
 883                 spin_unlock(&export->exp_lock);
 884                 CERROR("%s: %s already connected at higher conn_cnt: %d > %d\n",
 885                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 886                        export->exp_conn_cnt,
 887                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
 888
 889                 GOTO(out, rc = -EALREADY);
 890         }
 891         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
 892
 893         /* request from liblustre?  Don't evict it for not pinging. */
 894         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 895                 export->exp_libclient = 1;
 896                 spin_unlock(&export->exp_lock);
 897
 898                 spin_lock(&target->obd_dev_lock);
 899                 list_del_init(&export->exp_obd_chain_timed);
 900                 spin_unlock(&target->obd_dev_lock);
 901         } else {
 902                 spin_unlock(&export->exp_lock);
 903         }
 904
 905         if (export->exp_connection != NULL)
 906                 ptlrpc_put_connection(export->exp_connection);
 907         export->exp_connection = ptlrpc_get_connection(req->rq_peer,
 908                                                        req->rq_self,
 909                                                        &remote_uuid);
 910
 911         spin_lock(&target->obd_dev_lock);
 912         /* Export might be hashed already, e.g. if this is reconnect */
 913         if (hlist_unhashed(&export->exp_nid_hash))
 914                 lustre_hash_additem(export->exp_obd->obd_nid_hash_body,
 915                                     &export->exp_connection->c_peer.nid,
 916                                     &export->exp_nid_hash);
 917         spin_unlock(&target->obd_dev_lock);
 918
 919         spin_lock_bh(&target->obd_processing_task_lock);
 920         if (target->obd_recovering && !export->exp_in_recovery) {
 921                 spin_lock(&export->exp_lock);
 922                 export->exp_in_recovery = 1;
 923                 export->exp_req_replay_needed = 1;
 924                 export->exp_lock_replay_needed = 1;
 925                 spin_unlock(&export->exp_lock);
 926                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
 927                      && (data->ocd_transno == 0))
 928                         CWARN("Connect with zero transno!\n");
 929
 930                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
 931                      && data->ocd_transno < target->obd_next_recovery_transno)
 932                         target->obd_next_recovery_transno = data->ocd_transno;
 933                 target->obd_connected_clients++;
 934                 /* each connected client is counted as recoverable */
 935                 target->obd_recoverable_clients++;
 936                 atomic_inc(&target->obd_req_replay_clients);
 937                 atomic_inc(&target->obd_lock_replay_clients);
 938                 if (target->obd_connected_clients ==
 939                     target->obd_max_recoverable_clients)
 940                         wake_up(&target->obd_next_transno_waitq);
 941         }
 942         spin_unlock_bh(&target->obd_processing_task_lock);
 943         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 944         conn = *tmp;
 945
 946         if (export->exp_imp_reverse != NULL) {
 947                 /* destroyed import can be still referenced in ctxt */
 948                 obd_set_info_async(export, sizeof(KEY_REVIMP_UPD),
 949                                    KEY_REVIMP_UPD, 0, NULL, NULL);
 950
 951                 /* in some recovery senarios, previous ctx init rpc handled
 952                  * in sptlrpc_target_export_check() might be used to install
 953                  * a reverse ctx in this reverse import, and later OBD_CONNECT
 954                  * using the same gss ctx could reach here and following new
 955                  * reverse import. note all reverse ctx in new/old import are
 956                  * actually based on the same gss ctx. so we invalidate ctx
 957                  * here before destroy import, otherwise flush old import will
 958                  * lead to remote reverse ctx be destroied, thus the reverse
 959                  * ctx of new import will lost its peer.
 960                  * there might be a better way to deal with this???
 961                  */
 962                 sptlrpc_import_inval_all_ctx(export->exp_imp_reverse);
 963
 964                 destroy_import(export->exp_imp_reverse);
 965         }
 966
 967         /* for the rest part, we return -ENOTCONN in case of errors
 968          * in order to let client initialize connection again.
 969          */
 970         revimp = export->exp_imp_reverse = class_new_import(target);
 971         if (!revimp) {
 972                 CERROR("fail to alloc new reverse import.\n");
 973                 GOTO(out, rc = -ENOTCONN);
 974         }
 975
 976         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
 977         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
 978         revimp->imp_remote_handle = conn;
 979         revimp->imp_dlm_fake = 1;
 980         revimp->imp_state = LUSTRE_IMP_FULL;
 981         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
 982
 983         if ((export->exp_connect_flags & OBD_CONNECT_AT) &&
 984             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
 985                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 986         else
 987                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 988
 989         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx,
 990                                       req->rq_flvr.sf_rpc);
 991         if (rc) {
 992                 CERROR("Failed to get sec for reverse import: %d\n", rc);
 993                 export->exp_imp_reverse = NULL;
 994                 class_destroy_import(revimp);
 995         }
 996
 997         class_import_put(revimp);
 998 out:
 999         if (export) {
1000                 spin_lock(&export->exp_lock);
1001                 export->exp_connecting = 0;
1002                 spin_unlock(&export->exp_lock);
1003         }
1004         if (targref)
1005                 class_decref(targref);
1006         if (rc)
1007                 req->rq_status = rc;
1008         RETURN(rc);
1009 }
1010
1011 int target_handle_disconnect(struct ptlrpc_request *req)
1012 {
1013         int rc;
1014         ENTRY;
1015
1016         rc = req_capsule_server_pack(&req->rq_pill);
1017         if (rc)
1018                 RETURN(rc);
1019
1020         /* keep the rq_export around so we can send the reply */
1021         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1022
1023         RETURN(0);
1024 }
1025
1026 void target_destroy_export(struct obd_export *exp)
1027 {
1028         /* exports created from last_rcvd data, and "fake"
1029            exports created by lctl don't have an import */
1030         if (exp->exp_imp_reverse != NULL)
1031                 destroy_import(exp->exp_imp_reverse);
1032
1033         /* We cancel locks at disconnect time, but this will catch any locks
1034          * granted in a race with recovery-induced disconnect. */
1035         if (exp->exp_obd->obd_namespace != NULL)
1036                 ldlm_cancel_locks_for_export(exp);
1037 }
1038
1039 /*
1040  * Recovery functions
1041  */
1042
1043 struct ptlrpc_request *ptlrpc_clone_req( struct ptlrpc_request *orig_req)
1044 {
1045         struct ptlrpc_request *copy_req;
1046         struct lustre_msg *copy_reqmsg;
1047         struct ptlrpc_user_desc *udesc = NULL;
1048
1049         OBD_ALLOC_PTR(copy_req);
1050         if (!copy_req)
1051                 return NULL;
1052         OBD_ALLOC(copy_reqmsg, orig_req->rq_reqlen);
1053         if (!copy_reqmsg){
1054                 OBD_FREE_PTR(copy_req);
1055                 return NULL;
1056         }
1057
1058         if (orig_req->rq_user_desc) {
1059                 int ngroups = orig_req->rq_user_desc->pud_ngroups;
1060
1061                 OBD_ALLOC(udesc, sptlrpc_user_desc_size(ngroups));
1062                 if (!udesc) {
1063                         OBD_FREE(copy_reqmsg, orig_req->rq_reqlen);
1064                         OBD_FREE_PTR(copy_req);
1065                         return NULL;
1066                 }
1067                 memcpy(udesc, orig_req->rq_user_desc,
1068                        sptlrpc_user_desc_size(ngroups));
1069         }
1070
1071         *copy_req = *orig_req;
1072         memcpy(copy_reqmsg, orig_req->rq_reqmsg, orig_req->rq_reqlen);
1073         copy_req->rq_reqmsg = copy_reqmsg;
1074         copy_req->rq_user_desc = udesc;
1075
1076         class_export_get(copy_req->rq_export);
1077         CFS_INIT_LIST_HEAD(&copy_req->rq_list);
1078         CFS_INIT_LIST_HEAD(&copy_req->rq_replay_list);
1079         sptlrpc_svc_ctx_addref(copy_req);
1080
1081         if (copy_req->rq_reply_state) {
1082                 /* the copied req takes over the reply state */
1083                 orig_req->rq_reply_state = NULL;
1084                 /* to catch further access */
1085                 orig_req->rq_repmsg = NULL;
1086                 orig_req->rq_replen = 0;
1087         }
1088
1089         return copy_req;
1090 }
1091
1092 void ptlrpc_free_clone(struct ptlrpc_request *req)
1093 {
1094         LASSERT(list_empty(&req->rq_replay_list));
1095
1096         ptlrpc_req_drop_rs(req);
1097         sptlrpc_svc_ctx_decref(req);
1098         class_export_put(req->rq_export);
1099         list_del(&req->rq_list);
1100
1101         if (req->rq_user_desc) {
1102                 int ngroups = req->rq_user_desc->pud_ngroups;
1103                 OBD_FREE(req->rq_user_desc, sptlrpc_user_desc_size(ngroups));
1104         }
1105         OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
1106         OBD_FREE_PTR(req);
1107 }
1108
1109 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1110 {
1111         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1112         struct obd_export     *exp = req->rq_export;
1113         struct ptlrpc_request *reqiter;
1114         int                    dup = 0;
1115
1116         LASSERT(exp);
1117
1118         spin_lock(&exp->exp_lock);
1119         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1120                             rq_replay_list) {
1121                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1122                         dup = 1;
1123                         break;
1124                 }
1125         }
1126
1127         if (dup) {
1128                 /* we expect it with RESENT and REPLAY flags */
1129                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1130                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1131                         CERROR("invalid flags %x of resent replay\n",
1132                                lustre_msg_get_flags(req->rq_reqmsg));
1133         } else {
1134                 list_add_tail(&req->rq_replay_list, &exp->exp_req_replay_queue);
1135         }
1136
1137         spin_unlock(&exp->exp_lock);
1138         return dup;
1139 }
1140
1141 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1142 {
1143         LASSERT(!list_empty(&req->rq_replay_list));
1144         LASSERT(req->rq_export);
1145
1146         spin_lock(&req->rq_export->exp_lock);
1147         list_del_init(&req->rq_replay_list);
1148         spin_unlock(&req->rq_export->exp_lock);
1149 }
1150
1151 #ifdef __KERNEL__
1152 static void target_finish_recovery(struct obd_device *obd)
1153 {
1154         ENTRY;
1155         LCONSOLE_INFO("%s: sending delayed replies to recovered clients\n",
1156                       obd->obd_name);
1157
1158         ldlm_reprocess_all_ns(obd->obd_namespace);
1159
1160         /* when recovery finished, cleanup orphans on mds and ost */
1161         if (OBT(obd) && OBP(obd, postrecov)) {
1162                 int rc = OBP(obd, postrecov)(obd);
1163                 LCONSOLE_WARN("%s: recovery %s: rc %d\n", obd->obd_name,
1164                               rc < 0 ? "failed" : "complete", rc);
1165         }
1166
1167         obd->obd_recovery_end = cfs_time_current_sec();
1168         EXIT;
1169 }
1170
1171 static void abort_req_replay_queue(struct obd_device *obd)
1172 {
1173         struct ptlrpc_request *req, *n;
1174
1175         list_for_each_entry_safe(req, n, &obd->obd_req_replay_queue, rq_list) {
1176                 DEBUG_REQ(D_WARNING, req, "aborted:");
1177                 req->rq_status = -ENOTCONN;
1178                 if (ptlrpc_error(req)) {
1179                         DEBUG_REQ(D_ERROR, req,
1180                                   "failed abort_req_reply; skipping");
1181                 }
1182                 target_exp_dequeue_req_replay(req);
1183                 ptlrpc_free_clone(req);
1184         }
1185 }
1186
1187 static void abort_lock_replay_queue(struct obd_device *obd)
1188 {
1189         struct ptlrpc_request *req, *n;
1190
1191         list_for_each_entry_safe(req, n, &obd->obd_lock_replay_queue, rq_list){
1192                 DEBUG_REQ(D_ERROR, req, "aborted:");
1193                 req->rq_status = -ENOTCONN;
1194                 if (ptlrpc_error(req)) {
1195                         DEBUG_REQ(D_ERROR, req,
1196                                   "failed abort_lock_reply; skipping");
1197                 }
1198                 ptlrpc_free_clone(req);
1199         }
1200 }
1201 #endif
1202
1203 /* Called from a cleanup function if the device is being cleaned up
1204    forcefully.  The exports should all have been disconnected already,
1205    the only thing left to do is
1206      - clear the recovery flags
1207      - cancel the timer
1208      - free queued requests and replies, but don't send replies
1209    Because the obd_stopping flag is set, no new requests should be received.
1210
1211 */
1212 void target_cleanup_recovery(struct obd_device *obd)
1213 {
1214         struct ptlrpc_request *req, *n;
1215         ENTRY;
1216
1217         LASSERT(obd->obd_stopping);
1218
1219         spin_lock_bh(&obd->obd_processing_task_lock);
1220         if (!obd->obd_recovering) {
1221                 spin_unlock_bh(&obd->obd_processing_task_lock);
1222                 EXIT;
1223                 return;
1224         }
1225         obd->obd_recovering = obd->obd_abort_recovery = 0;
1226         target_cancel_recovery_timer(obd);
1227         spin_unlock_bh(&obd->obd_processing_task_lock);
1228
1229         list_for_each_entry_safe(req, n, &obd->obd_req_replay_queue, rq_list) {
1230                 LASSERT (req->rq_reply_state == 0);
1231                 target_exp_dequeue_req_replay(req);
1232                 ptlrpc_free_clone(req);
1233         }
1234         list_for_each_entry_safe(req, n, &obd->obd_lock_replay_queue, rq_list){
1235                 LASSERT (req->rq_reply_state == 0);
1236                 ptlrpc_free_clone(req);
1237         }
1238         list_for_each_entry_safe(req, n, &obd->obd_final_req_queue, rq_list) {
1239                 LASSERT (req->rq_reply_state == 0);
1240                 ptlrpc_free_clone(req);
1241         }
1242
1243         EXIT;
1244 }
1245
1246 /* obd_processing_task_lock should be held */
1247 void target_cancel_recovery_timer(struct obd_device *obd)
1248 {
1249         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1250         cfs_timer_disarm(&obd->obd_recovery_timer);
1251 }
1252
1253 /* extend = 1 means require at least "duration" seconds left in the timer,
1254    extend = 0 means set the total duration (start_recovery_timer) */
1255 static void reset_recovery_timer(struct obd_device *obd, int duration,
1256                                  int extend)
1257 {
1258         cfs_time_t now = cfs_time_current_sec();
1259         cfs_duration_t left;
1260
1261         spin_lock_bh(&obd->obd_processing_task_lock);
1262         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1263                 spin_unlock_bh(&obd->obd_processing_task_lock);
1264                 return;
1265         }
1266
1267         left = cfs_time_sub(obd->obd_recovery_end, now);
1268
1269         if (extend && (duration > left))
1270                 obd->obd_recovery_timeout += duration - left;
1271         else if (!extend && (duration > obd->obd_recovery_timeout))
1272                 /* Track the client's largest expected replay time */
1273                 obd->obd_recovery_timeout = duration;
1274 #ifdef CRAY_XT3
1275         /*
1276          * If total recovery time already exceed the
1277          * obd_recovery_max_time, then CRAY XT3 will
1278          * abort the recovery
1279          */
1280         if(obd->obd_recovery_timeout > obd->obd_recovery_max_time)
1281                 obd->obd_recovery_timeout = obd->obd_recovery_max_time;
1282 #endif
1283         obd->obd_recovery_end = obd->obd_recovery_start +
1284                                 obd->obd_recovery_timeout;
1285         if (!cfs_timer_is_armed(&obd->obd_recovery_timer) ||
1286             cfs_time_before(now, obd->obd_recovery_end)) {
1287                 left = cfs_time_sub(obd->obd_recovery_end, now);
1288                 cfs_timer_arm(&obd->obd_recovery_timer, cfs_time_shift(left));
1289         }
1290         spin_unlock_bh(&obd->obd_processing_task_lock);
1291         CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
1292                obd->obd_name, (unsigned)left);
1293 }
1294
1295 static void check_and_start_recovery_timer(struct obd_device *obd)
1296 {
1297         spin_lock_bh(&obd->obd_processing_task_lock);
1298         if (cfs_timer_is_armed(&obd->obd_recovery_timer)) {
1299                 spin_unlock_bh(&obd->obd_processing_task_lock);
1300                 return;
1301         }
1302         CWARN("%s: starting recovery timer\n", obd->obd_name);
1303         obd->obd_recovery_start = cfs_time_current_sec();
1304         /* minimum */
1305         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1306         spin_unlock_bh(&obd->obd_processing_task_lock);
1307
1308         reset_recovery_timer(obd, obd->obd_recovery_timeout, 0);
1309 }
1310
1311 /* Reset the timer with each new client connection */
1312 /*
1313  * This timer is actually reconnect_timer, which is for making sure
1314  * the total recovery window is at least as big as my reconnect
1315  * attempt timing. So the initial recovery time_out will be set to
1316  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1317  * from client is bigger than this, then the recovery time_out will
1318  * be extend to make sure the client could be reconnected, in the
1319  * process, the timeout from the new client should be ignored.
1320  */
1321
1322 static void
1323 target_start_and_reset_recovery_timer(struct obd_device *obd,
1324                                       struct ptlrpc_request *req,
1325                                       int new_client)
1326 {
1327         int req_timeout = OBD_RECOVERY_FACTOR *
1328                           lustre_msg_get_timeout(req->rq_reqmsg);
1329
1330         check_and_start_recovery_timer(obd);
1331
1332         if (req_timeout > obd->obd_recovery_timeout && !new_client)
1333                 reset_recovery_timer(obd, req_timeout, 0);
1334 }
1335
1336 #ifdef __KERNEL__
1337 static int check_for_next_transno(struct obd_device *obd)
1338 {
1339         struct ptlrpc_request *req = NULL;
1340         int wake_up = 0, connected, completed, queue_len, max;
1341         __u64 next_transno, req_transno;
1342         ENTRY;
1343         spin_lock_bh(&obd->obd_processing_task_lock);
1344
1345         if (!list_empty(&obd->obd_req_replay_queue)) {
1346                 req = list_entry(obd->obd_req_replay_queue.next,
1347                                  struct ptlrpc_request, rq_list);
1348                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1349         } else {
1350                 req_transno = 0;
1351         }
1352
1353         max = obd->obd_max_recoverable_clients;
1354         connected = obd->obd_connected_clients;
1355         completed = connected - obd->obd_recoverable_clients;
1356         queue_len = obd->obd_requests_queued_for_recovery;
1357         next_transno = obd->obd_next_recovery_transno;
1358
1359         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1360                "req_transno: "LPU64", next_transno: "LPU64"\n",
1361                max, connected, completed, queue_len, req_transno, next_transno);
1362
1363         if (obd->obd_abort_recovery) {
1364                 CDEBUG(D_HA, "waking for aborted recovery\n");
1365                 wake_up = 1;
1366         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1367                 CDEBUG(D_HA, "waking for completed recovery\n");
1368                 wake_up = 1;
1369         } else if (req_transno == next_transno) {
1370                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1371                 wake_up = 1;
1372         } else if (queue_len + completed == max) {
1373                 /* handle gaps occured due to lost reply. It is allowed gaps
1374                  * because all clients are connected and there will be resend
1375                  * for missed transaction */
1376                 LASSERTF(req_transno >= next_transno,
1377                          "req_transno: "LPU64", next_transno: "LPU64"\n",
1378                          req_transno, next_transno);
1379
1380                 CDEBUG(req_transno > obd->obd_last_committed ? D_ERROR : D_HA,
1381                        "waking for skipped transno (skip: "LPD64
1382                        ", ql: %d, comp: %d, conn: %d, next: "LPD64")\n",
1383                        next_transno, queue_len, completed, connected, req_transno);
1384                 obd->obd_next_recovery_transno = req_transno;
1385                 wake_up = 1;
1386         } else if (queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1387                 /* some clients haven't connected in time, but we can try
1388                  * to replay requests that demand on already committed ones
1389                  * also, we can replay first non-committed transation */
1390                 LASSERT(req_transno != 0);
1391                 if (req_transno == obd->obd_last_committed + 1) {
1392                         obd->obd_next_recovery_transno = req_transno;
1393                 } else if (req_transno > obd->obd_last_committed) {
1394                         /* can't continue recovery: have no needed transno */
1395                         obd->obd_abort_recovery = 1;
1396                         CDEBUG(D_ERROR, "abort due to missed clients. max: %d, "
1397                                "connected: %d, completed: %d, queue_len: %d, "
1398                                "req_transno: "LPU64", next_transno: "LPU64"\n",
1399                                max, connected, completed, queue_len,
1400                                req_transno, next_transno);
1401                 }
1402                 wake_up = 1;
1403         }
1404
1405         spin_unlock_bh(&obd->obd_processing_task_lock);
1406         return wake_up;
1407 }
1408
1409 static struct ptlrpc_request *target_next_replay_req(struct obd_device *obd)
1410 {
1411         struct l_wait_info lwi = { 0 };
1412         struct ptlrpc_request *req;
1413
1414         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1415                obd->obd_next_recovery_transno);
1416         l_wait_event(obd->obd_next_transno_waitq,
1417                      check_for_next_transno(obd), &lwi);
1418
1419         spin_lock_bh(&obd->obd_processing_task_lock);
1420         if (obd->obd_abort_recovery) {
1421                 req = NULL;
1422         } else if (!list_empty(&obd->obd_req_replay_queue)) {
1423                 req = list_entry(obd->obd_req_replay_queue.next,
1424                                  struct ptlrpc_request, rq_list);
1425                 target_exp_dequeue_req_replay(req);
1426                 list_del_init(&req->rq_list);
1427                 obd->obd_requests_queued_for_recovery--;
1428         } else {
1429                 req = NULL;
1430         }
1431         spin_unlock_bh(&obd->obd_processing_task_lock);
1432         RETURN(req);
1433 }
1434
1435 static int check_for_next_lock(struct obd_device *obd)
1436 {
1437         struct ptlrpc_request *req = NULL;
1438         int wake_up = 0;
1439
1440         spin_lock_bh(&obd->obd_processing_task_lock);
1441         if (!list_empty(&obd->obd_lock_replay_queue)) {
1442                 req = list_entry(obd->obd_lock_replay_queue.next,
1443                                  struct ptlrpc_request, rq_list);
1444                 CDEBUG(D_HA, "waking for next lock\n");
1445                 wake_up = 1;
1446         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1447                 CDEBUG(D_HA, "waking for completed lock replay\n");
1448                 wake_up = 1;
1449         } else if (obd->obd_abort_recovery) {
1450                 CDEBUG(D_HA, "waking for aborted recovery\n");
1451                 wake_up = 1;
1452         }
1453         spin_unlock_bh(&obd->obd_processing_task_lock);
1454
1455         return wake_up;
1456 }
1457
1458 static struct ptlrpc_request *target_next_replay_lock(struct obd_device *obd)
1459 {
1460         struct l_wait_info lwi = { 0 };
1461         struct ptlrpc_request *req;
1462
1463         CDEBUG(D_HA, "Waiting for lock\n");
1464         l_wait_event(obd->obd_next_transno_waitq,
1465                      check_for_next_lock(obd), &lwi);
1466
1467         spin_lock_bh(&obd->obd_processing_task_lock);
1468         if (obd->obd_abort_recovery) {
1469                 req = NULL;
1470         } else if (!list_empty(&obd->obd_lock_replay_queue)) {
1471                 req = list_entry(obd->obd_lock_replay_queue.next,
1472                                  struct ptlrpc_request, rq_list);
1473                 list_del_init(&req->rq_list);
1474         } else {
1475                 req = NULL;
1476         }
1477         spin_unlock_bh(&obd->obd_processing_task_lock);
1478         return req;
1479 }
1480
1481 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
1482 {
1483         struct ptlrpc_request *req;
1484
1485         spin_lock_bh(&obd->obd_processing_task_lock);
1486         if (!list_empty(&obd->obd_final_req_queue)) {
1487                 req = list_entry(obd->obd_final_req_queue.next,
1488                                  struct ptlrpc_request, rq_list);
1489                 list_del_init(&req->rq_list);
1490         } else {
1491                 req = NULL;
1492         }
1493         spin_unlock_bh(&obd->obd_processing_task_lock);
1494         return req;
1495 }
1496
1497 static inline int req_replay_done(struct obd_export *exp)
1498 {
1499         return (exp->exp_req_replay_needed == 0);
1500 }
1501
1502 static inline int lock_replay_done(struct obd_export *exp)
1503 {
1504         return (exp->exp_lock_replay_needed == 0);
1505 }
1506
1507 static inline int connect_done(struct obd_export *exp)
1508 {
1509         return (exp->exp_in_recovery != 0);
1510 }
1511
1512 static int check_for_clients(struct obd_device *obd)
1513 {
1514         if (obd->obd_abort_recovery)
1515                 return 1;
1516         LASSERT(obd->obd_connected_clients <= obd->obd_max_recoverable_clients);
1517         if (obd->obd_no_conn == 0 &&
1518             obd->obd_connected_clients == obd->obd_max_recoverable_clients)
1519                 return 1;
1520         return 0;
1521 }
1522
1523 static int handle_recovery_req(struct ptlrpc_thread *thread,
1524                                struct ptlrpc_request *req,
1525                                svc_handler_t handler)
1526 {
1527         int rc;
1528         ENTRY;
1529
1530         rc = lu_context_init(&req->rq_session, LCT_SESSION);
1531         if (rc) {
1532                 CERROR("Failure to initialize session: %d\n", rc);
1533                 return rc;
1534         }
1535         req->rq_session.lc_thread = thread;
1536         lu_context_enter(&req->rq_session);
1537         req->rq_svc_thread = thread;
1538         req->rq_svc_thread->t_env->le_ses = &req->rq_session;
1539
1540         /* thread context */
1541         lu_context_enter(&thread->t_env->le_ctx);
1542         (void)handler(req);
1543         lu_context_exit(&thread->t_env->le_ctx);
1544
1545         lu_context_exit(&req->rq_session);
1546         lu_context_fini(&req->rq_session);
1547         /* don't reset timer for final stage */
1548         if (!req_replay_done(req->rq_export) ||
1549             !lock_replay_done(req->rq_export))
1550                 reset_recovery_timer(class_exp2obd(req->rq_export),
1551                        OBD_RECOVERY_FACTOR * AT_OFF ? obd_timeout :
1552                        at_get(&req->rq_rqbd->rqbd_service->srv_at_estimate), 1);
1553         ptlrpc_free_clone(req);
1554         RETURN(0);
1555 }
1556
1557 static void resume_recovery_timer(struct obd_device *obd)
1558 {
1559         /* to be safe, make it at least OBD_RECOVERY_FACTOR * obd_timeout */
1560         reset_recovery_timer(obd, OBD_RECOVERY_FACTOR * obd_timeout, 1);
1561 }
1562
1563 static int target_recovery_thread(void *arg)
1564 {
1565         struct obd_device *obd = arg;
1566         struct ptlrpc_request *req;
1567         struct target_recovery_data *trd = &obd->obd_recovery_data;
1568         struct l_wait_info lwi = { 0 };
1569         unsigned long delta;
1570         unsigned long flags;
1571         struct lu_env env;
1572         struct ptlrpc_thread fake_svc_thread, *thread = &fake_svc_thread;
1573         __u32 recov_ctx_tags = LCT_MD_THREAD;
1574         int rc = 0;
1575         ENTRY;
1576
1577         cfs_daemonize("tgt_recov");
1578
1579         SIGNAL_MASK_LOCK(current, flags);
1580         sigfillset(&current->blocked);
1581         RECALC_SIGPENDING;
1582         SIGNAL_MASK_UNLOCK(current, flags);
1583
1584         rc = lu_context_init(&env.le_ctx, recov_ctx_tags);
1585         if (rc)
1586                 RETURN(rc);
1587
1588         thread->t_env = &env;
1589         env.le_ctx.lc_thread = thread;
1590
1591         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
1592                current->pid);
1593         trd->trd_processing_task = current->pid;
1594
1595         obd->obd_recovering = 1;
1596         complete(&trd->trd_starting);
1597
1598         /* first of all, we have to know the first transno to replay */
1599         obd->obd_abort_recovery = 0;
1600         l_wait_event(obd->obd_next_transno_waitq,
1601                      check_for_clients(obd), &lwi);
1602
1603         spin_lock_bh(&obd->obd_processing_task_lock);
1604         target_cancel_recovery_timer(obd);
1605         spin_unlock_bh(&obd->obd_processing_task_lock);
1606
1607         /* If some clients haven't connected in time, evict them */
1608         if (obd->obd_abort_recovery) {
1609                 CWARN("Some clients haven't connect in time (%d/%d),"
1610                        "evict them\n", obd->obd_connected_clients,
1611                        obd->obd_max_recoverable_clients);
1612                 obd->obd_abort_recovery = obd->obd_stopping;
1613                 class_disconnect_stale_exports(obd, connect_done);
1614         }
1615         /* next stage: replay requests */
1616         delta = jiffies;
1617         obd->obd_req_replaying = 1;
1618         CDEBUG(D_INFO, "1: request replay stage - %d clients from t"LPU64"\n",
1619               atomic_read(&obd->obd_req_replay_clients),
1620               obd->obd_next_recovery_transno);
1621         resume_recovery_timer(obd);
1622         while ((req = target_next_replay_req(obd))) {
1623                 LASSERT(trd->trd_processing_task == current->pid);
1624                 DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s",
1625                           lustre_msg_get_transno(req->rq_reqmsg),
1626                           libcfs_nid2str(req->rq_peer.nid));
1627                 handle_recovery_req(thread, req,
1628                                     trd->trd_recovery_handler);
1629                 obd->obd_replayed_requests++;
1630                 spin_lock_bh(&obd->obd_processing_task_lock);
1631                 obd->obd_next_recovery_transno++;
1632                 spin_unlock_bh(&obd->obd_processing_task_lock);
1633         }
1634
1635         spin_lock_bh(&obd->obd_processing_task_lock);
1636         target_cancel_recovery_timer(obd);
1637         spin_unlock_bh(&obd->obd_processing_task_lock);
1638
1639         /* If some clients haven't replayed requests in time, evict them */
1640         if (obd->obd_abort_recovery) {
1641                 CDEBUG(D_ERROR, "req replay timed out, aborting ...\n");
1642                 obd->obd_abort_recovery = obd->obd_stopping;
1643                 class_disconnect_stale_exports(obd, req_replay_done);
1644                 abort_req_replay_queue(obd);
1645         }
1646
1647         /* The second stage: replay locks */
1648         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
1649                atomic_read(&obd->obd_lock_replay_clients));
1650         resume_recovery_timer(obd);
1651         while ((req = target_next_replay_lock(obd))) {
1652                 LASSERT(trd->trd_processing_task == current->pid);
1653                 DEBUG_REQ(D_HA|D_WARNING, req, "processing lock from %s: ",
1654                           libcfs_nid2str(req->rq_peer.nid));
1655                 handle_recovery_req(thread, req,
1656                                     trd->trd_recovery_handler);
1657                 obd->obd_replayed_locks++;
1658         }
1659
1660         spin_lock_bh(&obd->obd_processing_task_lock);
1661         target_cancel_recovery_timer(obd);
1662         spin_unlock_bh(&obd->obd_processing_task_lock);
1663         /* If some clients haven't replayed requests in time, evict them */
1664         if (obd->obd_abort_recovery) {
1665                 int stale;
1666                 CERROR("lock replay timed out, aborting ...\n");
1667                 obd->obd_abort_recovery = obd->obd_stopping;
1668                 stale = class_disconnect_stale_exports(obd, lock_replay_done);
1669                 abort_lock_replay_queue(obd);
1670         }
1671
1672         /* We drop recoverying flag to forward all new requests
1673          * to regular mds_handle() since now */
1674         spin_lock_bh(&obd->obd_processing_task_lock);
1675         obd->obd_recovering = obd->obd_abort_recovery = 0;
1676         spin_unlock_bh(&obd->obd_processing_task_lock);
1677         /* The third stage: reply on final pings */
1678         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
1679         while ((req = target_next_final_ping(obd))) {
1680                 LASSERT(trd->trd_processing_task == current->pid);
1681                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
1682                           libcfs_nid2str(req->rq_peer.nid));
1683                 handle_recovery_req(thread, req,
1684                                     trd->trd_recovery_handler);
1685         }
1686
1687         delta = (jiffies - delta) / HZ;
1688         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
1689               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
1690         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
1691         LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
1692         if (delta > obd_timeout * 2) {
1693                 CWARN("too long recovery - read logs\n");
1694                 libcfs_debug_dumplog();
1695         }
1696
1697         target_finish_recovery(obd);
1698
1699         lu_context_fini(&env.le_ctx);
1700         trd->trd_processing_task = 0;
1701         complete(&trd->trd_finishing);
1702         RETURN(rc);
1703 }
1704
1705 int target_start_recovery_thread(struct obd_device *obd, svc_handler_t handler)
1706 {
1707         int rc = 0;
1708         struct target_recovery_data *trd = &obd->obd_recovery_data;
1709
1710         memset(trd, 0, sizeof(*trd));
1711         init_completion(&trd->trd_starting);
1712         init_completion(&trd->trd_finishing);
1713         trd->trd_recovery_handler = handler;
1714
1715         if (kernel_thread(target_recovery_thread, obd, 0) > 0) {
1716                 wait_for_completion(&trd->trd_starting);
1717                 LASSERT(obd->obd_recovering != 0);
1718         } else
1719                 rc = -ECHILD;
1720
1721         return rc;
1722 }
1723
1724 void target_stop_recovery_thread(struct obd_device *obd)
1725 {
1726         spin_lock_bh(&obd->obd_processing_task_lock);
1727         if (obd->obd_recovery_data.trd_processing_task > 0) {
1728                 struct target_recovery_data *trd = &obd->obd_recovery_data;
1729                 CERROR("%s: Aborting recovery\n", obd->obd_name);
1730                 obd->obd_abort_recovery = 1;
1731                 wake_up(&obd->obd_next_transno_waitq);
1732                 spin_unlock_bh(&obd->obd_processing_task_lock);
1733                 wait_for_completion(&trd->trd_finishing);
1734         } else {
1735                 spin_unlock_bh(&obd->obd_processing_task_lock);
1736         }
1737 }
1738
1739 void target_recovery_fini(struct obd_device *obd)
1740 {
1741         class_disconnect_exports(obd);
1742         target_stop_recovery_thread(obd);
1743         target_cleanup_recovery(obd);
1744 }
1745 EXPORT_SYMBOL(target_recovery_fini);
1746
1747 static void target_recovery_expired(unsigned long castmeharder)
1748 {
1749         struct obd_device *obd = (struct obd_device *)castmeharder;
1750         LCONSOLE_WARN("%s: recovery timed out; %d clients never reconnected "
1751                       "after %lds (%d clients did)\n",
1752                       obd->obd_name, obd->obd_recoverable_clients,
1753                       cfs_time_current_sec()- obd->obd_recovery_start,
1754                       obd->obd_connected_clients);
1755         spin_lock_bh(&obd->obd_processing_task_lock);
1756         if (obd->obd_recovering)
1757                 obd->obd_abort_recovery = 1;
1758         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1759         spin_unlock_bh(&obd->obd_processing_task_lock);
1760 }
1761
1762 void target_recovery_init(struct obd_device *obd, svc_handler_t handler)
1763 {
1764         if (obd->obd_max_recoverable_clients == 0)
1765                 return;
1766
1767         CWARN("RECOVERY: service %s, %d recoverable clients, "
1768               "last_transno "LPU64"\n", obd->obd_name,
1769               obd->obd_max_recoverable_clients, obd->obd_last_committed);
1770         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
1771         obd->obd_recovery_start = 0;
1772         obd->obd_recovery_end = 0;
1773         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1774         /* bz13079: this should be set to desired value for ost but not for mds */
1775         obd->obd_recovery_max_time = OBD_RECOVERY_MAX_TIME;
1776         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
1777         target_start_recovery_thread(obd, handler);
1778 }
1779 EXPORT_SYMBOL(target_recovery_init);
1780
1781 #endif
1782
1783 int target_process_req_flags(struct obd_device *obd, struct ptlrpc_request *req)
1784 {
1785         struct obd_export *exp = req->rq_export;
1786         LASSERT(exp != NULL);
1787         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1788                 /* client declares he's ready to replay locks */
1789                 spin_lock_bh(&obd->obd_processing_task_lock);
1790                 if (exp->exp_req_replay_needed) {
1791                         LASSERT(atomic_read(&obd->obd_req_replay_clients) > 0);
1792                         spin_lock(&exp->exp_lock);
1793                         exp->exp_req_replay_needed = 0;
1794                         spin_unlock(&exp->exp_lock);
1795                         atomic_dec(&obd->obd_req_replay_clients);
1796                         LASSERT(obd->obd_recoverable_clients > 0);
1797                         obd->obd_recoverable_clients--;
1798                         if (atomic_read(&obd->obd_req_replay_clients) == 0)
1799                                 CDEBUG(D_HA, "all clients have replayed reqs\n");
1800                         wake_up(&obd->obd_next_transno_waitq);
1801                 }
1802                 spin_unlock_bh(&obd->obd_processing_task_lock);
1803         }
1804         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1805                 /* client declares he's ready to complete recovery
1806                  * so, we put the request on th final queue */
1807                 spin_lock_bh(&obd->obd_processing_task_lock);
1808                 if (exp->exp_lock_replay_needed) {
1809                         LASSERT(atomic_read(&obd->obd_lock_replay_clients) > 0);
1810                         spin_lock(&exp->exp_lock);
1811                         exp->exp_lock_replay_needed = 0;
1812                         spin_unlock(&exp->exp_lock);
1813                         atomic_dec(&obd->obd_lock_replay_clients);
1814                         if (atomic_read(&obd->obd_lock_replay_clients) == 0)
1815                                 CDEBUG(D_HA, "all clients have replayed locks\n");
1816                         wake_up(&obd->obd_next_transno_waitq);
1817                 }
1818                 spin_unlock_bh(&obd->obd_processing_task_lock);
1819         }
1820
1821         return 0;
1822 }
1823
1824 int target_queue_recovery_request(struct ptlrpc_request *req,
1825                                   struct obd_device *obd)
1826 {
1827         struct list_head *tmp;
1828         int inserted = 0;
1829         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1830
1831         ENTRY;
1832
1833         if (obd->obd_recovery_data.trd_processing_task == cfs_curproc_pid()) {
1834                 /* Processing the queue right now, don't re-add. */
1835                 RETURN(1);
1836         }
1837
1838         target_process_req_flags(obd, req);
1839
1840         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1841                 /* client declares he's ready to complete recovery
1842                  * so, we put the request on th final queue */
1843                 req = ptlrpc_clone_req(req);
1844                 if (req == NULL)
1845                         RETURN(-ENOMEM);
1846                 DEBUG_REQ(D_HA, req, "queue final req");
1847                 spin_lock_bh(&obd->obd_processing_task_lock);
1848                 if (obd->obd_recovering)
1849                         list_add_tail(&req->rq_list, &obd->obd_final_req_queue);
1850                 else {
1851                         spin_unlock_bh(&obd->obd_processing_task_lock);
1852                         ptlrpc_free_clone(req);
1853                         if (obd->obd_stopping) {
1854                                 RETURN(-ENOTCONN);
1855                         } else {
1856                                 RETURN(1);
1857                         }
1858                 }
1859                 spin_unlock_bh(&obd->obd_processing_task_lock);
1860                 RETURN(0);
1861         }
1862         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1863                 /* client declares he's ready to replay locks */
1864                 req = ptlrpc_clone_req(req);
1865                 if (req == NULL)
1866                         RETURN(-ENOMEM);
1867                 DEBUG_REQ(D_HA, req, "queue lock replay req");
1868                 spin_lock_bh(&obd->obd_processing_task_lock);
1869                 LASSERT(obd->obd_recovering);
1870                 /* usually due to recovery abort */
1871                 if (!req->rq_export->exp_in_recovery) {
1872                         spin_unlock_bh(&obd->obd_processing_task_lock);
1873                         ptlrpc_free_clone(req);
1874                         RETURN(-ENOTCONN);
1875                 }
1876                 LASSERT(req->rq_export->exp_lock_replay_needed);
1877                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
1878                 spin_unlock_bh(&obd->obd_processing_task_lock);
1879                 wake_up(&obd->obd_next_transno_waitq);
1880                 RETURN(0);
1881         }
1882
1883         /* CAVEAT EMPTOR: The incoming request message has been swabbed
1884          * (i.e. buflens etc are in my own byte order), but type-dependent
1885          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
1886
1887         if (!transno) {
1888                 CFS_INIT_LIST_HEAD(&req->rq_list);
1889                 DEBUG_REQ(D_HA, req, "not queueing");
1890                 RETURN(1);
1891         }
1892
1893         spin_lock_bh(&obd->obd_processing_task_lock);
1894
1895         /* If we're processing the queue, we want don't want to queue this
1896          * message.
1897          *
1898          * Also, if this request has a transno less than the one we're waiting
1899          * for, we should process it now.  It could (and currently always will)
1900          * be an open request for a descriptor that was opened some time ago.
1901          *
1902          * Also, a resent, replayed request that has already been
1903          * handled will pass through here and be processed immediately.
1904          */
1905         CWARN("Next recovery transno: "LPU64", current: "LPU64", replaying: %i\n",
1906               obd->obd_next_recovery_transno, transno, obd->obd_req_replaying);
1907         if (transno < obd->obd_next_recovery_transno && obd->obd_req_replaying) {
1908                 /* Processing the queue right now, don't re-add. */
1909                 LASSERT(list_empty(&req->rq_list));
1910                 spin_unlock_bh(&obd->obd_processing_task_lock);
1911                 RETURN(1);
1912         }
1913         spin_unlock_bh(&obd->obd_processing_task_lock);
1914
1915         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
1916                 RETURN(0);
1917
1918         req = ptlrpc_clone_req(req);
1919         if (req == NULL)
1920                 RETURN(-ENOMEM);
1921
1922         spin_lock_bh(&obd->obd_processing_task_lock);
1923         LASSERT(obd->obd_recovering);
1924         if (!req->rq_export->exp_in_recovery) {
1925                 spin_unlock_bh(&obd->obd_processing_task_lock);
1926                 ptlrpc_free_clone(req);
1927                 RETURN(-ENOTCONN);
1928         }
1929         LASSERT(req->rq_export->exp_req_replay_needed);
1930
1931         if (target_exp_enqueue_req_replay(req)) {
1932                 spin_unlock_bh(&obd->obd_processing_task_lock);
1933                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
1934                 ptlrpc_free_clone(req);
1935                 RETURN(0);
1936         }
1937
1938         /* XXX O(n^2) */
1939         list_for_each(tmp, &obd->obd_req_replay_queue) {
1940                 struct ptlrpc_request *reqiter =
1941                         list_entry(tmp, struct ptlrpc_request, rq_list);
1942
1943                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
1944                         list_add_tail(&req->rq_list, &reqiter->rq_list);
1945                         inserted = 1;
1946                         break;
1947                 }
1948
1949                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
1950                              transno)) {
1951                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
1952                                   "has been claimed by another client");
1953                         spin_unlock_bh(&obd->obd_processing_task_lock);
1954                         target_exp_dequeue_req_replay(req);
1955                         ptlrpc_free_clone(req);
1956                         RETURN(0);
1957                 }
1958         }
1959
1960         if (!inserted)
1961                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
1962
1963         obd->obd_requests_queued_for_recovery++;
1964         wake_up(&obd->obd_next_transno_waitq);
1965         spin_unlock_bh(&obd->obd_processing_task_lock);
1966         RETURN(0);
1967 }
1968
1969 struct obd_device * target_req2obd(struct ptlrpc_request *req)
1970 {
1971         return req->rq_export->exp_obd;
1972 }
1973
1974 static inline struct ldlm_pool *ldlm_exp2pl(struct obd_export *exp)
1975 {
1976         LASSERT(exp != NULL);
1977         return &exp->exp_obd->obd_namespace->ns_pool;
1978 }
1979
1980 /**
1981  * Packs current SLV and Limit into \a req.
1982  */
1983 int target_pack_pool_reply(struct ptlrpc_request *req)
1984 {
1985         struct obd_device *obd;
1986         ENTRY;
1987
1988         /*
1989          * Check that we still have all structures alive as this may
1990          * be some late rpc in shutdown time.
1991          */
1992         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
1993                      !exp_connect_lru_resize(req->rq_export))) {
1994                 lustre_msg_set_slv(req->rq_repmsg, 0);
1995                 lustre_msg_set_limit(req->rq_repmsg, 0);
1996                 RETURN(0);
1997         }
1998
1999         /*
2000          * OBD is alive here as export is alive, which we checked above.
2001          */
2002         obd = req->rq_export->exp_obd;
2003
2004         read_lock(&obd->obd_pool_lock);
2005         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2006         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2007         read_unlock(&obd->obd_pool_lock);
2008
2009         RETURN(0);
2010 }
2011
2012 int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
2013 {
2014         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2015                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2016                 return (-ECOMM);
2017         }
2018
2019         if (unlikely(rc)) {
2020                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
2021                 req->rq_status = rc;
2022                 return (ptlrpc_send_error(req, 1));
2023         } else {
2024                 DEBUG_REQ(D_NET, req, "sending reply");
2025         }
2026
2027         return (ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT));
2028 }
2029
2030 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2031 {
2032         int                        netrc;
2033         struct ptlrpc_reply_state *rs;
2034         struct obd_device         *obd;
2035         struct obd_export         *exp;
2036         struct ptlrpc_service     *svc;
2037
2038         if (req->rq_no_reply)
2039                 return;
2040
2041         svc = req->rq_rqbd->rqbd_service;
2042         rs = req->rq_reply_state;
2043         if (rs == NULL || !rs->rs_difficult) {
2044                 /* no notifiers */
2045                 target_send_reply_msg (req, rc, fail_id);
2046                 return;
2047         }
2048
2049         /* must be an export if locks saved */
2050         LASSERT (req->rq_export != NULL);
2051         /* req/reply consistent */
2052         LASSERT (rs->rs_service == svc);
2053
2054         /* "fresh" reply */
2055         LASSERT (!rs->rs_scheduled);
2056         LASSERT (!rs->rs_scheduled_ever);
2057         LASSERT (!rs->rs_handled);
2058         LASSERT (!rs->rs_on_net);
2059         LASSERT (rs->rs_export == NULL);
2060         LASSERT (list_empty(&rs->rs_obd_list));
2061         LASSERT (list_empty(&rs->rs_exp_list));
2062
2063         exp = class_export_get (req->rq_export);
2064         obd = exp->exp_obd;
2065
2066         /* disable reply scheduling onto srv_reply_queue while I'm setting up */
2067         rs->rs_scheduled = 1;
2068         rs->rs_on_net    = 1;
2069         rs->rs_xid       = req->rq_xid;
2070         rs->rs_transno   = req->rq_transno;
2071         rs->rs_export    = exp;
2072
2073         spin_lock(&obd->obd_uncommitted_replies_lock);
2074
2075         if (rs->rs_transno > obd->obd_last_committed) {
2076                 /* not committed already */
2077                 list_add_tail (&rs->rs_obd_list,
2078                                &obd->obd_uncommitted_replies);
2079         }
2080
2081         spin_unlock (&obd->obd_uncommitted_replies_lock);
2082         spin_lock (&exp->exp_lock);
2083
2084         list_add_tail (&rs->rs_exp_list, &exp->exp_outstanding_replies);
2085
2086         spin_unlock(&exp->exp_lock);
2087
2088         netrc = target_send_reply_msg (req, rc, fail_id);
2089
2090         spin_lock(&svc->srv_lock);
2091
2092         svc->srv_n_difficult_replies++;
2093
2094         if (netrc != 0) {
2095                 /* error sending: reply is off the net.  Also we need +1
2096                  * reply ref until ptlrpc_server_handle_reply() is done
2097                  * with the reply state (if the send was successful, there
2098                  * would have been +1 ref for the net, which
2099                  * reply_out_callback leaves alone) */
2100                 rs->rs_on_net = 0;
2101                 ptlrpc_rs_addref(rs);
2102                 atomic_inc (&svc->srv_outstanding_replies);
2103         }
2104
2105         if (!rs->rs_on_net ||                   /* some notifier */
2106             list_empty(&rs->rs_exp_list) ||     /* completed already */
2107             list_empty(&rs->rs_obd_list)) {
2108                 list_add_tail (&rs->rs_list, &svc->srv_reply_queue);
2109                 cfs_waitq_signal (&svc->srv_waitq);
2110         } else {
2111                 list_add (&rs->rs_list, &svc->srv_active_replies);
2112                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
2113         }
2114
2115         spin_unlock(&svc->srv_lock);
2116 }
2117
2118 int target_handle_ping(struct ptlrpc_request *req)
2119 {
2120         obd_ping(req->rq_export);
2121         return req_capsule_server_pack(&req->rq_pill);
2122 }
2123
2124 void target_committed_to_req(struct ptlrpc_request *req)
2125 {
2126         struct obd_device *obd;
2127
2128         if (req == NULL || req->rq_export == NULL)
2129                 return;
2130
2131         obd = req->rq_export->exp_obd;
2132         if (obd == NULL)
2133                 return;
2134
2135         if (!obd->obd_no_transno && req->rq_repmsg != NULL)
2136                 lustre_msg_set_last_committed(req->rq_repmsg,
2137                                               obd->obd_last_committed);
2138         else
2139                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2140                           "%d)", obd->obd_no_transno, req->rq_repmsg == NULL);
2141
2142         CDEBUG(D_INFO, "last_committed "LPU64", transno "LPU64", xid "LPU64"\n",
2143                obd->obd_last_committed, req->rq_transno, req->rq_xid);
2144 }
2145
2146 EXPORT_SYMBOL(target_committed_to_req);
2147
2148 #ifdef HAVE_QUOTA_SUPPORT
2149 int target_handle_qc_callback(struct ptlrpc_request *req)
2150 {
2151         struct obd_quotactl *oqctl;
2152         struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
2153
2154         oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2155         if (oqctl == NULL)
2156                 RETURN(-EPROTO);
2157
2158         cli->cl_qchk_stat = oqctl->qc_stat;
2159
2160         return 0;
2161 }
2162
2163 int target_handle_dqacq_callback(struct ptlrpc_request *req)
2164 {
2165 #ifdef __KERNEL__
2166         struct obd_device *obd = req->rq_export->exp_obd;
2167         struct obd_device *master_obd;
2168         struct lustre_quota_ctxt *qctxt;
2169         struct qunit_data *qdata;
2170         void* rep;
2171         struct qunit_data_old *qdata_old;
2172         int rc = 0;
2173         ENTRY;
2174
2175         rc = req_capsule_server_pack(&req->rq_pill);
2176         if (rc) {
2177                 CERROR("packing reply failed!: rc = %d\n", rc);
2178                 RETURN(rc);
2179         }
2180
2181         LASSERT(req->rq_export);
2182
2183         /* fixed for bug10707 */
2184         if ((req->rq_export->exp_connect_flags & OBD_CONNECT_QUOTA64) &&
2185             !OBD_FAIL_CHECK(OBD_FAIL_QUOTA_QD_COUNT_32BIT)) {
2186                 CDEBUG(D_QUOTA, "qd_count is 64bit!\n");
2187                 rep = req_capsule_server_get(&req->rq_pill,
2188                                              &RMF_QUNIT_DATA);
2189                 LASSERT(rep);
2190                 qdata = req_capsule_client_swab_get(&req->rq_pill,
2191                                                     &RMF_QUNIT_DATA,
2192                                           (void*)lustre_swab_qdata);
2193         } else {
2194                 CDEBUG(D_QUOTA, "qd_count is 32bit!\n");
2195                 rep = req_capsule_server_get(&req->rq_pill, &RMF_QUNIT_DATA);
2196                 LASSERT(rep);
2197                 qdata_old = req_capsule_client_swab_get(&req->rq_pill,
2198                                                         &RMF_QUNIT_DATA,
2199                                            (void*)lustre_swab_qdata_old);
2200                 qdata = lustre_quota_old_to_new(qdata_old);
2201         }
2202
2203         if (qdata == NULL)
2204                 RETURN(-EPROTO);
2205
2206         /* we use the observer */
2207         LASSERT(obd->obd_observer && obd->obd_observer->obd_observer);
2208         master_obd = obd->obd_observer->obd_observer;
2209         qctxt = &master_obd->u.obt.obt_qctxt;
2210
2211         LASSERT(qctxt->lqc_handler);
2212         rc = qctxt->lqc_handler(master_obd, qdata,
2213                                 lustre_msg_get_opc(req->rq_reqmsg));
2214         if (rc && rc != -EDQUOT)
2215                 CDEBUG(rc == -EBUSY  ? D_QUOTA : D_ERROR,
2216                        "dqacq failed! (rc:%d)\n", rc);
2217
2218         /* the qd_count might be changed in lqc_handler */
2219         if ((req->rq_export->exp_connect_flags & OBD_CONNECT_QUOTA64) &&
2220             !OBD_FAIL_CHECK(OBD_FAIL_QUOTA_QD_COUNT_32BIT)) {
2221                 memcpy(rep, qdata, sizeof(*qdata));
2222         } else {
2223                 qdata_old = lustre_quota_new_to_old(qdata);
2224                 memcpy(rep, qdata_old, sizeof(*qdata_old));
2225         }
2226         req->rq_status = rc;
2227         rc = ptlrpc_reply(req);
2228
2229         RETURN(rc);
2230 #else
2231         return 0;
2232 #endif /* !__KERNEL__ */
2233 }
2234 #endif /* HAVE_QUOTA_SUPPORT */
2235
2236 ldlm_mode_t lck_compat_array[] = {
2237         [LCK_EX] LCK_COMPAT_EX,
2238         [LCK_PW] LCK_COMPAT_PW,
2239         [LCK_PR] LCK_COMPAT_PR,
2240         [LCK_CW] LCK_COMPAT_CW,
2241         [LCK_CR] LCK_COMPAT_CR,
2242         [LCK_NL] LCK_COMPAT_NL,
2243         [LCK_GROUP] LCK_COMPAT_GROUP
2244 };