lustre/ldlm/ldlm_lib.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #ifndef EXPORT_SYMTAB
  38 # define EXPORT_SYMTAB
  39 #endif
  40 #define DEBUG_SUBSYSTEM S_LDLM
  41
  42 #ifdef __KERNEL__
  43 # include <libcfs/libcfs.h>
  44 #else
  45 # include <liblustre.h>
  46 #endif
  47 #include <obd.h>
  48 #include <lustre_mds.h>
  49 #include <lustre_dlm.h>
  50 #include <lustre_net.h>
  51 #include <lustre_sec.h>
  52 #include "ldlm_internal.h"
  53
  54 /* @priority: if non-zero, move the selected to the list head
  55  * @create: if zero, only search in existed connections
  56  */
  57 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  58                            int priority, int create)
  59 {
  60         struct ptlrpc_connection *ptlrpc_conn;
  61         struct obd_import_conn *imp_conn = NULL, *item;
  62         int rc = 0;
  63         ENTRY;
  64
  65         if (!create && !priority) {
  66                 CDEBUG(D_HA, "Nothing to do\n");
  67                 RETURN(-EINVAL);
  68         }
  69
  70         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
  71         if (!ptlrpc_conn) {
  72                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  73                 RETURN (-ENOENT);
  74         }
  75
  76         if (create) {
  77                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  78                 if (!imp_conn) {
  79                         GOTO(out_put, rc = -ENOMEM);
  80                 }
  81         }
  82
  83         spin_lock(&imp->imp_lock);
  84         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  85                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  86                         if (priority) {
  87                                 list_del(&item->oic_item);
  88                                 list_add(&item->oic_item, &imp->imp_conn_list);
  89                                 item->oic_last_attempt = 0;
  90                         }
  91                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  92                                imp, imp->imp_obd->obd_name, uuid->uuid,
  93                                (priority ? ", moved to head" : ""));
  94                         spin_unlock(&imp->imp_lock);
  95                         GOTO(out_free, rc = 0);
  96                 }
  97         }
  98         /* not found */
  99         if (create) {
 100                 imp_conn->oic_conn = ptlrpc_conn;
 101                 imp_conn->oic_uuid = *uuid;
 102                 imp_conn->oic_last_attempt = 0;
 103                 if (priority)
 104                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
 105                 else
 106                         list_add_tail(&imp_conn->oic_item, &imp->imp_conn_list);
 107                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
 108                        imp, imp->imp_obd->obd_name, uuid->uuid,
 109                        (priority ? "head" : "tail"));
 110         } else {
 111                 spin_unlock(&imp->imp_lock);
 112                 GOTO(out_free, rc = -ENOENT);
 113         }
 114
 115         spin_unlock(&imp->imp_lock);
 116         RETURN(0);
 117 out_free:
 118         if (imp_conn)
 119                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 120 out_put:
 121         ptlrpc_connection_put(ptlrpc_conn);
 122         RETURN(rc);
 123 }
 124
 125 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 126 {
 127         return import_set_conn(imp, uuid, 1, 0);
 128 }
 129
 130 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 131                            int priority)
 132 {
 133         return import_set_conn(imp, uuid, priority, 1);
 134 }
 135
 136 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 137 {
 138         struct obd_import_conn *imp_conn;
 139         struct obd_export *dlmexp;
 140         int rc = -ENOENT;
 141         ENTRY;
 142
 143         spin_lock(&imp->imp_lock);
 144         if (list_empty(&imp->imp_conn_list)) {
 145                 LASSERT(!imp->imp_connection);
 146                 GOTO(out, rc);
 147         }
 148
 149         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 150                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 151                         continue;
 152                 LASSERT(imp_conn->oic_conn);
 153
 154                 /* is current conn? */
 155                 if (imp_conn == imp->imp_conn_current) {
 156                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 157
 158                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 159                             imp->imp_state != LUSTRE_IMP_DISCON) {
 160                                 CERROR("can't remove current connection\n");
 161                                 GOTO(out, rc = -EBUSY);
 162                         }
 163
 164                         ptlrpc_connection_put(imp->imp_connection);
 165                         imp->imp_connection = NULL;
 166
 167                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 168                         if (dlmexp && dlmexp->exp_connection) {
 169                                 LASSERT(dlmexp->exp_connection ==
 170                                         imp_conn->oic_conn);
 171                                 ptlrpc_connection_put(dlmexp->exp_connection);
 172                                 dlmexp->exp_connection = NULL;
 173                         }
 174                 }
 175
 176                 list_del(&imp_conn->oic_item);
 177                 ptlrpc_connection_put(imp_conn->oic_conn);
 178                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 179                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 180                        imp, imp->imp_obd->obd_name, uuid->uuid);
 181                 rc = 0;
 182                 break;
 183         }
 184 out:
 185         spin_unlock(&imp->imp_lock);
 186         if (rc == -ENOENT)
 187                 CERROR("connection %s not found\n", uuid->uuid);
 188         RETURN(rc);
 189 }
 190
 191 void client_destroy_import(struct obd_import *imp)
 192 {
 193         /* drop security policy instance after all rpc finished/aborted
 194          * to let all busy contexts be released. */
 195         class_import_get(imp);
 196         class_destroy_import(imp);
 197         sptlrpc_import_sec_put(imp);
 198         class_import_put(imp);
 199 }
 200
 201 /* configure an RPC client OBD device
 202  *
 203  * lcfg parameters:
 204  * 1 - client UUID
 205  * 2 - server UUID
 206  * 3 - inactive-on-startup
 207  */
 208 int client_obd_setup(struct obd_device *obddev, struct lustre_cfg *lcfg)
 209 {
 210         struct client_obd *cli = &obddev->u.cli;
 211         struct obd_import *imp;
 212         struct obd_uuid server_uuid;
 213         int rq_portal, rp_portal, connect_op;
 214         char *name = obddev->obd_type->typ_name;
 215         int rc;
 216         ENTRY;
 217
 218         /* In a more perfect world, we would hang a ptlrpc_client off of
 219          * obd_type and just use the values from there. */
 220         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 221                 rq_portal = OST_REQUEST_PORTAL;
 222                 rp_portal = OSC_REPLY_PORTAL;
 223                 connect_op = OST_CONNECT;
 224                 cli->cl_sp_me = LUSTRE_SP_CLI;
 225                 cli->cl_sp_to = LUSTRE_SP_OST;
 226         } else if (!strcmp(name, LUSTRE_MDC_NAME)) {
 227                 rq_portal = MDS_REQUEST_PORTAL;
 228                 rp_portal = MDC_REPLY_PORTAL;
 229                 connect_op = MDS_CONNECT;
 230                 cli->cl_sp_me = LUSTRE_SP_CLI;
 231                 cli->cl_sp_to = LUSTRE_SP_MDT;
 232         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 233                 rq_portal = MGS_REQUEST_PORTAL;
 234                 rp_portal = MGC_REPLY_PORTAL;
 235                 connect_op = MGS_CONNECT;
 236                 cli->cl_sp_me = LUSTRE_SP_MGC;
 237                 cli->cl_sp_to = LUSTRE_SP_MGS;
 238                 cli->cl_flvr_mgc.sf_rpc = SPTLRPC_FLVR_INVALID;
 239         } else {
 240                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 241                        name);
 242                 RETURN(-EINVAL);
 243         }
 244
 245         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 246                 CERROR("requires a TARGET UUID\n");
 247                 RETURN(-EINVAL);
 248         }
 249
 250         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 251                 CERROR("client UUID must be less than 38 characters\n");
 252                 RETURN(-EINVAL);
 253         }
 254
 255         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 256                 CERROR("setup requires a SERVER UUID\n");
 257                 RETURN(-EINVAL);
 258         }
 259
 260         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 261                 CERROR("target UUID must be less than 38 characters\n");
 262                 RETURN(-EINVAL);
 263         }
 264
 265         init_rwsem(&cli->cl_sem);
 266         sema_init(&cli->cl_mgc_sem, 1);
 267         cli->cl_conn_count = 0;
 268         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 269                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 270                      sizeof(server_uuid)));
 271
 272         cli->cl_dirty = 0;
 273         cli->cl_avail_grant = 0;
 274         /* FIXME: should limit this for the sum of all cl_dirty_max */
 275         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 276         if (cli->cl_dirty_max >> CFS_PAGE_SHIFT > num_physpages / 8)
 277                 cli->cl_dirty_max = num_physpages << (CFS_PAGE_SHIFT - 3);
 278         CFS_INIT_LIST_HEAD(&cli->cl_cache_waiters);
 279         CFS_INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 280         CFS_INIT_LIST_HEAD(&cli->cl_loi_hp_ready_list);
 281         CFS_INIT_LIST_HEAD(&cli->cl_loi_write_list);
 282         CFS_INIT_LIST_HEAD(&cli->cl_loi_read_list);
 283         client_obd_list_lock_init(&cli->cl_loi_list_lock);
 284         cli->cl_r_in_flight = 0;
 285         cli->cl_w_in_flight = 0;
 286
 287         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 288         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 289         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 290         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 291         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 292         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 293         cfs_waitq_init(&cli->cl_destroy_waitq);
 294         atomic_set(&cli->cl_destroy_in_flight, 0);
 295 #ifdef ENABLE_CHECKSUM
 296         /* Turn on checksumming by default. */
 297         cli->cl_checksum = 1;
 298         /*
 299          * The supported checksum types will be worked out at connect time
 300          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 301          * through procfs.
 302          */
 303         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 304 #endif
 305         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 306         atomic_set(&cli->cl_quota_resends, CLIENT_QUOTA_DEFAULT_RESENDS);
 307
 308         /* This value may be changed at connect time in
 309            ptlrpc_connect_interpret. */
 310         cli->cl_max_pages_per_rpc = min((int)PTLRPC_MAX_BRW_PAGES,
 311                                         (int)(1024 * 1024 >> CFS_PAGE_SHIFT));
 312
 313         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 314                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
 315         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 128 /* MB */) {
 316                 cli->cl_max_rpcs_in_flight = 2;
 317         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 256 /* MB */) {
 318                 cli->cl_max_rpcs_in_flight = 3;
 319         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 512 /* MB */) {
 320                 cli->cl_max_rpcs_in_flight = 4;
 321         } else {
 322                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 323         }
 324
 325         rc = ldlm_get_ref();
 326         if (rc) {
 327                 CERROR("ldlm_get_ref failed: %d\n", rc);
 328                 GOTO(err, rc);
 329         }
 330
 331         ptlrpc_init_client(rq_portal, rp_portal, name,
 332                            &obddev->obd_ldlm_client);
 333
 334         imp = class_new_import(obddev);
 335         if (imp == NULL)
 336                 GOTO(err_ldlm, rc = -ENOENT);
 337         imp->imp_client = &obddev->obd_ldlm_client;
 338         imp->imp_connect_op = connect_op;
 339         imp->imp_initial_recov = 1;
 340         imp->imp_initial_recov_bk = 0;
 341         CFS_INIT_LIST_HEAD(&imp->imp_pinger_chain);
 342         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 343                LUSTRE_CFG_BUFLEN(lcfg, 1));
 344         class_import_put(imp);
 345
 346         rc = client_import_add_conn(imp, &server_uuid, 1);
 347         if (rc) {
 348                 CERROR("can't add initial connection\n");
 349                 GOTO(err_import, rc);
 350         }
 351
 352         cli->cl_import = imp;
 353         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 354         cli->cl_max_mds_easize = sizeof(struct lov_mds_md_v3);
 355         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 356
 357         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 358                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 359                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 360                                name, obddev->obd_name,
 361                                cli->cl_target_uuid.uuid);
 362                         spin_lock(&imp->imp_lock);
 363                         imp->imp_deactive = 1;
 364                         spin_unlock(&imp->imp_lock);
 365                 }
 366         }
 367
 368         obddev->obd_namespace = ldlm_namespace_new(obddev, obddev->obd_name,
 369                                                    LDLM_NAMESPACE_CLIENT,
 370                                                    LDLM_NAMESPACE_GREEDY);
 371         if (obddev->obd_namespace == NULL) {
 372                 CERROR("Unable to create client namespace - %s\n",
 373                        obddev->obd_name);
 374                 GOTO(err_import, rc = -ENOMEM);
 375         }
 376
 377         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 378
 379         RETURN(rc);
 380
 381 err_import:
 382         class_destroy_import(imp);
 383 err_ldlm:
 384         ldlm_put_ref();
 385 err:
 386         RETURN(rc);
 387
 388 }
 389
 390 int client_obd_cleanup(struct obd_device *obddev)
 391 {
 392         ENTRY;
 393
 394         ldlm_namespace_free_post(obddev->obd_namespace);
 395         obddev->obd_namespace = NULL;
 396
 397         ldlm_put_ref();
 398         RETURN(0);
 399 }
 400
 401 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 402 int client_connect_import(const struct lu_env *env,
 403                           struct obd_export **exp,
 404                           struct obd_device *obd, struct obd_uuid *cluuid,
 405                           struct obd_connect_data *data, void *localdata)
 406 {
 407         struct client_obd *cli = &obd->u.cli;
 408         struct obd_import *imp = cli->cl_import;
 409         struct obd_connect_data *ocd;
 410         struct lustre_handle conn = { 0 };
 411         int rc;
 412         ENTRY;
 413
 414         *exp = NULL;
 415         down_write(&cli->cl_sem);
 416         if (cli->cl_conn_count > 0 )
 417                 GOTO(out_sem, rc = -EALREADY);
 418
 419         rc = class_connect(&conn, obd, cluuid);
 420         if (rc)
 421                 GOTO(out_sem, rc);
 422
 423         cli->cl_conn_count++;
 424         *exp = class_conn2export(&conn);
 425
 426         LASSERT(obd->obd_namespace);
 427
 428         imp->imp_dlm_handle = conn;
 429         rc = ptlrpc_init_import(imp);
 430         if (rc != 0)
 431                 GOTO(out_ldlm, rc);
 432
 433         ocd = &imp->imp_connect_data;
 434         if (data) {
 435                 *ocd = *data;
 436                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 437         }
 438
 439         rc = ptlrpc_connect_import(imp, NULL);
 440         if (rc != 0) {
 441                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 442                 GOTO(out_ldlm, rc);
 443         }
 444         LASSERT((*exp)->exp_connection);
 445
 446         if (data) {
 447                 LASSERTF((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 448                          ocd->ocd_connect_flags, "old "LPX64", new "LPX64"\n",
 449                          data->ocd_connect_flags, ocd->ocd_connect_flags);
 450                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 451         }
 452
 453         ptlrpc_pinger_add_import(imp);
 454
 455         EXIT;
 456
 457         if (rc) {
 458 out_ldlm:
 459                 cli->cl_conn_count--;
 460                 class_disconnect(*exp);
 461                 *exp = NULL;
 462         }
 463 out_sem:
 464         up_write(&cli->cl_sem);
 465
 466         return rc;
 467 }
 468
 469 int client_disconnect_export(struct obd_export *exp)
 470 {
 471         struct obd_device *obd = class_exp2obd(exp);
 472         struct client_obd *cli;
 473         struct obd_import *imp;
 474         int rc = 0, err;
 475         ENTRY;
 476
 477         if (!obd) {
 478                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 479                        exp, exp ? exp->exp_handle.h_cookie : -1);
 480                 RETURN(-EINVAL);
 481         }
 482
 483         cli = &obd->u.cli;
 484         imp = cli->cl_import;
 485
 486         down_write(&cli->cl_sem);
 487         CDEBUG(D_INFO, "disconnect %s - %d\n", obd->obd_name,
 488                cli->cl_conn_count);
 489
 490         if (!cli->cl_conn_count) {
 491                 CERROR("disconnecting disconnected device (%s)\n",
 492                        obd->obd_name);
 493                 GOTO(out_disconnect, rc = -EINVAL);
 494         }
 495
 496         cli->cl_conn_count--;
 497         if (cli->cl_conn_count)
 498                 GOTO(out_disconnect, rc = 0);
 499
 500         /* Mark import deactivated now, so we don't try to reconnect if any
 501          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
 502          * fully deactivate the import, or that would drop all requests. */
 503         spin_lock(&imp->imp_lock);
 504         imp->imp_deactive = 1;
 505         spin_unlock(&imp->imp_lock);
 506
 507         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 508          * delete it regardless.  (It's safe to delete an import that was
 509          * never added.) */
 510         (void)ptlrpc_pinger_del_import(imp);
 511
 512         if (obd->obd_namespace != NULL) {
 513                 /* obd_force == local only */
 514                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 515                                        obd->obd_force ? LDLM_FL_LOCAL_ONLY:0,
 516                                        NULL);
 517                 ldlm_namespace_free_prior(obd->obd_namespace, imp, obd->obd_force);
 518         }
 519
 520         /*
 521          * there's no need to hold sem during disconnecting an import,
 522          * and actually it may cause deadlock in gss.
 523          */
 524         up_write(&cli->cl_sem);
 525         rc = ptlrpc_disconnect_import(imp, 0);
 526         down_write(&cli->cl_sem);
 527
 528         ptlrpc_invalidate_import(imp);
 529
 530         if (imp->imp_rq_pool) {
 531                 ptlrpc_free_rq_pool(imp->imp_rq_pool);
 532                 imp->imp_rq_pool = NULL;
 533         }
 534         client_destroy_import(imp);
 535         cli->cl_import = NULL;
 536
 537         EXIT;
 538
 539  out_disconnect:
 540         /* use server style - class_disconnect should be always called for
 541          * o_disconnect */
 542         err = class_disconnect(exp);
 543         if (!rc && err)
 544                 rc = err;
 545
 546         up_write(&cli->cl_sem);
 547
 548         RETURN(rc);
 549 }
 550
 551 int server_disconnect_export(struct obd_export *exp)
 552 {
 553         int rc;
 554         ENTRY;
 555
 556         /* Disconnect early so that clients can't keep using export */
 557         rc = class_disconnect(exp);
 558         /* close import for avoid sending any requests */
 559         if (exp->exp_imp_reverse)
 560                 ptlrpc_cleanup_imp(exp->exp_imp_reverse);
 561
 562         if (exp->exp_obd->obd_namespace != NULL)
 563                 ldlm_cancel_locks_for_export(exp);
 564
 565         /* complete all outstanding replies */
 566         spin_lock(&exp->exp_lock);
 567         while (!list_empty(&exp->exp_outstanding_replies)) {
 568                 struct ptlrpc_reply_state *rs =
 569                         list_entry(exp->exp_outstanding_replies.next,
 570                                    struct ptlrpc_reply_state, rs_exp_list);
 571                 struct ptlrpc_service *svc = rs->rs_service;
 572
 573                 spin_lock(&svc->srv_lock);
 574                 list_del_init(&rs->rs_exp_list);
 575                 spin_lock(&rs->rs_lock);
 576                 ptlrpc_schedule_difficult_reply(rs);
 577                 spin_unlock(&rs->rs_lock);
 578                 spin_unlock(&svc->srv_lock);
 579         }
 580         spin_unlock(&exp->exp_lock);
 581
 582         /* release nid stat refererence */
 583         lprocfs_exp_cleanup(exp);
 584
 585         RETURN(rc);
 586 }
 587
 588 /* --------------------------------------------------------------------------
 589  * from old lib/target.c
 590  * -------------------------------------------------------------------------- */
 591
 592 static int target_handle_reconnect(struct lustre_handle *conn,
 593                                    struct obd_export *exp,
 594                                    struct obd_uuid *cluuid)
 595 {
 596         ENTRY;
 597         if (exp->exp_connection && exp->exp_imp_reverse) {
 598                 struct lustre_handle *hdl;
 599                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 600                 /* Might be a re-connect after a partition. */
 601                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 602                         CWARN("%s: %s reconnecting\n", exp->exp_obd->obd_name,
 603                               cluuid->uuid);
 604                         conn->cookie = exp->exp_handle.h_cookie;
 605                         /* target_handle_connect() treats EALREADY and
 606                          * -EALREADY differently.  EALREADY means we are
 607                          * doing a valid reconnect from the same client. */
 608                         RETURN(EALREADY);
 609                 } else {
 610                         CERROR("%s reconnecting from %s, "
 611                                "handle mismatch (ours "LPX64", theirs "
 612                                LPX64")\n", cluuid->uuid,
 613                                exp->exp_connection->c_remote_uuid.uuid,
 614                                hdl->cookie, conn->cookie);
 615                         memset(conn, 0, sizeof *conn);
 616                         /* target_handle_connect() treats EALREADY and
 617                          * -EALREADY differently.  -EALREADY is an error
 618                          * (same UUID, different handle). */
 619                         RETURN(-EALREADY);
 620                 }
 621         }
 622
 623         conn->cookie = exp->exp_handle.h_cookie;
 624         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
 625                cluuid->uuid, exp, conn->cookie);
 626         RETURN(0);
 627 }
 628
 629 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
 630                           int error)
 631 {
 632         struct obd_export *exp = cb_data;
 633
 634         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 635                obd->obd_name, exp->exp_client_uuid.uuid);
 636
 637         spin_lock(&exp->exp_lock);
 638         exp->exp_need_sync = 0;
 639         spin_unlock(&exp->exp_lock);
 640         class_export_cb_put(exp);
 641 }
 642 EXPORT_SYMBOL(target_client_add_cb);
 643
 644 static void
 645 target_start_and_reset_recovery_timer(struct obd_device *obd,
 646                                       struct ptlrpc_request *req,
 647                                       int new_client);
 648
 649 int target_handle_connect(struct ptlrpc_request *req)
 650 {
 651         struct obd_device *target, *targref = NULL;
 652         struct obd_export *export = NULL;
 653         struct obd_import *revimp;
 654         struct lustre_handle conn;
 655         struct lustre_handle *tmp;
 656         struct obd_uuid tgtuuid;
 657         struct obd_uuid cluuid;
 658         struct obd_uuid remote_uuid;
 659         char *str;
 660         int rc = 0;
 661         int mds_conn = 0;
 662         struct obd_connect_data *data, *tmpdata;
 663         lnet_nid_t *client_nid = NULL;
 664         ENTRY;
 665
 666         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 667
 668         str = req_capsule_client_get(&req->rq_pill, &RMF_TGTUUID);
 669         if (str == NULL) {
 670                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 671                 GOTO(out, rc = -EINVAL);
 672         }
 673
 674         obd_str2uuid(&tgtuuid, str);
 675         target = class_uuid2obd(&tgtuuid);
 676         if (!target)
 677                 target = class_name2obd(str);
 678
 679         if (!target || target->obd_stopping || !target->obd_set_up) {
 680                 LCONSOLE_ERROR_MSG(0x137, "UUID '%s' is not available "
 681                                    " for connect (%s)\n", str,
 682                                    !target ? "no target" :
 683                                    (target->obd_stopping ? "stopping" :
 684                                    "not set up"));
 685                 GOTO(out, rc = -ENODEV);
 686         }
 687
 688         if (target->obd_no_conn) {
 689                 LCONSOLE_WARN("%s: temporarily refusing client connection "
 690                               "from %s\n", target->obd_name,
 691                               libcfs_nid2str(req->rq_peer.nid));
 692                 GOTO(out, rc = -EAGAIN);
 693         }
 694
 695         /* Make sure the target isn't cleaned up while we're here. Yes,
 696            there's still a race between the above check and our incref here.
 697            Really, class_uuid2obd should take the ref. */
 698         targref = class_incref(target, __FUNCTION__, cfs_current());
 699
 700
 701         str = req_capsule_client_get(&req->rq_pill, &RMF_CLUUID);
 702         if (str == NULL) {
 703                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
 704                 GOTO(out, rc = -EINVAL);
 705         }
 706
 707         obd_str2uuid(&cluuid, str);
 708
 709         /* XXX extract a nettype and format accordingly */
 710         switch (sizeof(lnet_nid_t)) {
 711                 /* NB the casts only avoid compiler warnings */
 712         case 8:
 713                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 714                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
 715                 break;
 716         case 4:
 717                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 718                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
 719                 break;
 720         default:
 721                 LBUG();
 722         }
 723
 724         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
 725         if (tmp == NULL)
 726                 GOTO(out, rc = -EPROTO);
 727
 728         conn = *tmp;
 729
 730         data = req_capsule_client_get(&req->rq_pill, &RMF_CONNECT_DATA);
 731         if (!data)
 732                 GOTO(out, rc = -EPROTO);
 733
 734         rc = req_capsule_server_pack(&req->rq_pill);
 735         if (rc)
 736                 GOTO(out, rc);
 737
 738         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 739                 if (!data) {
 740                         DEBUG_REQ(D_WARNING, req, "Refusing old (unversioned) "
 741                                   "libclient connection attempt");
 742                         GOTO(out, rc = -EPROTO);
 743                 } else if (data->ocd_version < LUSTRE_VERSION_CODE -
 744                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
 745                            data->ocd_version > LUSTRE_VERSION_CODE +
 746                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
 747                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
 748                                   "libclient connection attempt",
 749                                   data->ocd_version < LUSTRE_VERSION_CODE ?
 750                                   "old" : "new",
 751                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
 752                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
 753                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
 754                                   OBD_OCD_VERSION_FIX(data->ocd_version));
 755                         data = req_capsule_server_sized_get(&req->rq_pill,
 756                                                         &RMF_CONNECT_DATA,
 757                                     offsetof(typeof(*data), ocd_version) +
 758                                              sizeof(data->ocd_version));
 759                         if (data) {
 760                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
 761                                 data->ocd_version = LUSTRE_VERSION_CODE;
 762                         }
 763                         GOTO(out, rc = -EPROTO);
 764                 }
 765         }
 766
 767         if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL) &&
 768             (data->ocd_connect_flags & OBD_CONNECT_MDS))
 769                 mds_conn = 1;
 770
 771         /* lctl gets a backstage, all-access pass. */
 772         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 773                 goto dont_check_exports;
 774
 775         export = lustre_hash_lookup(target->obd_uuid_hash, &cluuid);
 776         if (!export)
 777                 goto no_export;
 778
 779         /* we've found an export in the hash */
 780         if (export->exp_connecting) { /* bug 9635, et. al. */
 781                 CWARN("%s: exp %p already connecting\n",
 782                       export->exp_obd->obd_name, export);
 783                 class_export_put(export);
 784                 export = NULL;
 785                 rc = -EALREADY;
 786         } else if (mds_conn && export->exp_connection) {
 787                 if (req->rq_peer.nid != export->exp_connection->c_peer.nid)
 788                         /* mds reconnected after failover */
 789                         CWARN("%s: received MDS connection from NID %s,"
 790                               " removing former export from NID %s\n",
 791                             target->obd_name, libcfs_nid2str(req->rq_peer.nid),
 792                             libcfs_nid2str(export->exp_connection->c_peer.nid));
 793                 else
 794                         /* new mds connection from the same nid */
 795                         CWARN("%s: received new MDS connection from NID %s,"
 796                               " removing former export from same NID\n",
 797                             target->obd_name, libcfs_nid2str(req->rq_peer.nid));
 798                 class_fail_export(export);
 799                 class_export_put(export);
 800                 export = NULL;
 801                 rc = 0;
 802         } else if (export->exp_connection != NULL &&
 803                    req->rq_peer.nid != export->exp_connection->c_peer.nid &&
 804                    (lustre_msg_get_op_flags(req->rq_reqmsg) &
 805                     MSG_CONNECT_INITIAL)) {
 806                 /* in mds failover we have static uuid but nid can be
 807                  * changed*/
 808                 CWARN("%s: cookie %s seen on new NID %s when "
 809                       "existing NID %s is already connected\n",
 810                       target->obd_name, cluuid.uuid,
 811                       libcfs_nid2str(req->rq_peer.nid),
 812                       libcfs_nid2str(export->exp_connection->c_peer.nid));
 813                 rc = -EALREADY;
 814                 class_export_put(export);
 815                 export = NULL;
 816         } else {
 817                 spin_lock(&export->exp_lock);
 818                 export->exp_connecting = 1;
 819                 spin_unlock(&export->exp_lock);
 820                 class_export_put(export);
 821                 LASSERT(export->exp_obd == target);
 822
 823                 rc = target_handle_reconnect(&conn, export, &cluuid);
 824         }
 825
 826         /* If we found an export, we already unlocked. */
 827         if (!export) {
 828 no_export:
 829                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
 830         } else if (req->rq_export == NULL &&
 831                    atomic_read(&export->exp_rpc_count) > 0) {
 832                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
 833                       target->obd_name, cluuid.uuid,
 834                       libcfs_nid2str(req->rq_peer.nid),
 835                       export, atomic_read(&export->exp_refcount));
 836                 GOTO(out, rc = -EBUSY);
 837         } else if (req->rq_export != NULL &&
 838                    (atomic_read(&export->exp_rpc_count) > 1)) {
 839                 /* the current connect rpc has increased exp_rpc_count */
 840                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
 841                       target->obd_name, cluuid.uuid,
 842                       libcfs_nid2str(req->rq_peer.nid),
 843                       export, atomic_read(&export->exp_rpc_count) - 1);
 844                 spin_lock(&export->exp_lock);
 845                 if (req->rq_export->exp_conn_cnt <
 846                     lustre_msg_get_conn_cnt(req->rq_reqmsg))
 847                         /* try to abort active requests */
 848                         req->rq_export->exp_abort_active_req = 1;
 849                 spin_unlock(&export->exp_lock);
 850                 GOTO(out, rc = -EBUSY);
 851         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
 852                 CERROR("%s: NID %s (%s) reconnected with 1 conn_cnt; "
 853                        "cookies not random?\n", target->obd_name,
 854                        libcfs_nid2str(req->rq_peer.nid), cluuid.uuid);
 855                 GOTO(out, rc = -EALREADY);
 856         } else {
 857                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
 858         }
 859
 860         if (rc < 0) {
 861                 GOTO(out, rc);
 862         }
 863
 864         CWARN("%s: connection from %s@%s %st"LPU64" exp %p cur %ld last %ld\n",
 865                target->obd_name, cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 866               target->obd_recovering ? "recovering/" : "", data->ocd_transno,
 867               export, (long)cfs_time_current_sec(),
 868               export ? (long)export->exp_last_request_time : 0);
 869
 870         /* Tell the client if we're in recovery. */
 871         if (target->obd_recovering) {
 872                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 873                 /* If this is the first time a client connects,
 874                    reset the recovery timer */
 875                 if (rc == 0)
 876                         target_start_and_reset_recovery_timer(target, req,
 877                                                               !export);
 878         }
 879
 880         /* We want to handle EALREADY but *not* -EALREADY from
 881          * target_handle_reconnect(), return reconnection state in a flag */
 882         if (rc == EALREADY) {
 883                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 884                 rc = 0;
 885         } else {
 886                 LASSERT(rc == 0);
 887         }
 888
 889         /* Tell the client if we support replayable requests */
 890         if (target->obd_replayable)
 891                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 892         client_nid = &req->rq_peer.nid;
 893
 894         if (export == NULL) {
 895                 if (target->obd_recovering) {
 896                         cfs_time_t t;
 897
 898                         t = cfs_timer_deadline(&target->obd_recovery_timer);
 899                         t = cfs_time_sub(t, cfs_time_current());
 900                         CERROR("%s: denying connection for new client %s (%s): "
 901                                "%d clients in recovery for "CFS_TIME_T"s\n",
 902                                target->obd_name,
 903                                libcfs_nid2str(req->rq_peer.nid), cluuid.uuid,
 904                                atomic_read(&target->obd_lock_replay_clients),
 905                                cfs_duration_sec(t));
 906                         rc = -EBUSY;
 907                 } else {
 908 dont_check_exports:
 909                         rc = obd_connect(req->rq_svc_thread->t_env,
 910                                          &export, target, &cluuid, data,
 911                                          client_nid);
 912                         if (rc == 0)
 913                                 conn.cookie = export->exp_handle.h_cookie;
 914                 }
 915         } else {
 916                 rc = obd_reconnect(req->rq_svc_thread->t_env,
 917                                    export, target, &cluuid, data, client_nid);
 918                 if (rc == 0)
 919                         /* prevous done via class_conn2export */
 920                         class_export_get(export);
 921         }
 922         if (rc)
 923                 GOTO(out, rc);
 924         /* Return only the parts of obd_connect_data that we understand, so the
 925          * client knows that we don't understand the rest. */
 926         if (data) {
 927                  tmpdata = req_capsule_server_get(&req->rq_pill,
 928                                                   &RMF_CONNECT_DATA);
 929                   //data->ocd_connect_flags &= OBD_CONNECT_SUPPORTED;
 930                  *tmpdata = *data;
 931         }
 932
 933         /* If all else goes well, this is our RPC return code. */
 934         req->rq_status = 0;
 935
 936         lustre_msg_set_handle(req->rq_repmsg, &conn);
 937
 938         /* If the client and the server are the same node, we will already
 939          * have an export that really points to the client's DLM export,
 940          * because we have a shared handles table.
 941          *
 942          * XXX this will go away when shaver stops sending the "connect" handle
 943          * in the real "remote handle" field of the request --phik 24 Apr 2003
 944          */
 945         if (req->rq_export != NULL)
 946                 class_export_put(req->rq_export);
 947
 948         req->rq_export = export;
 949
 950         spin_lock(&export->exp_lock);
 951         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
 952                 spin_unlock(&export->exp_lock);
 953                 CERROR("%s: %s already connected at higher conn_cnt: %d > %d\n",
 954                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 955                        export->exp_conn_cnt,
 956                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
 957
 958                 GOTO(out, rc = -EALREADY);
 959         }
 960         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
 961         export->exp_abort_active_req = 0;
 962
 963         /* request from liblustre?  Don't evict it for not pinging. */
 964         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 965                 export->exp_libclient = 1;
 966                 spin_unlock(&export->exp_lock);
 967
 968                 spin_lock(&target->obd_dev_lock);
 969                 list_del_init(&export->exp_obd_chain_timed);
 970                 spin_unlock(&target->obd_dev_lock);
 971         } else {
 972                 spin_unlock(&export->exp_lock);
 973         }
 974
 975         if (export->exp_connection != NULL) {
 976                 /* Check to see if connection came from another NID */
 977                 if ((export->exp_connection->c_peer.nid != req->rq_peer.nid) &&
 978                     !hlist_unhashed(&export->exp_nid_hash))
 979                         lustre_hash_del(export->exp_obd->obd_nid_hash,
 980                                         &export->exp_connection->c_peer.nid,
 981                                         &export->exp_nid_hash);
 982
 983                 ptlrpc_connection_put(export->exp_connection);
 984         }
 985
 986         export->exp_connection = ptlrpc_connection_get(req->rq_peer,
 987                                                        req->rq_self,
 988                                                        &remote_uuid);
 989         if (hlist_unhashed(&export->exp_nid_hash)) {
 990                 lustre_hash_add_unique(export->exp_obd->obd_nid_hash,
 991                                        &export->exp_connection->c_peer.nid,
 992                                        &export->exp_nid_hash);
 993         }
 994
 995         spin_lock_bh(&target->obd_processing_task_lock);
 996         if (target->obd_recovering && !export->exp_in_recovery) {
 997                 spin_lock(&export->exp_lock);
 998                 export->exp_in_recovery = 1;
 999                 export->exp_req_replay_needed = 1;
1000                 export->exp_lock_replay_needed = 1;
1001                 spin_unlock(&export->exp_lock);
1002                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
1003                      && (data->ocd_transno == 0))
1004                         CWARN("Connect with zero transno!\n");
1005
1006                 if ((lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_TRANSNO)
1007                      && data->ocd_transno < target->obd_next_recovery_transno)
1008                         target->obd_next_recovery_transno = data->ocd_transno;
1009                 target->obd_connected_clients++;
1010                 atomic_inc(&target->obd_req_replay_clients);
1011                 atomic_inc(&target->obd_lock_replay_clients);
1012                 if (target->obd_connected_clients ==
1013                     target->obd_max_recoverable_clients)
1014                         cfs_waitq_signal(&target->obd_next_transno_waitq);
1015         }
1016         spin_unlock_bh(&target->obd_processing_task_lock);
1017         tmp = req_capsule_client_get(&req->rq_pill, &RMF_CONN);
1018         conn = *tmp;
1019
1020         if (export->exp_imp_reverse != NULL) {
1021                 /* destroyed import can be still referenced in ctxt */
1022                 obd_set_info_async(export, sizeof(KEY_REVIMP_UPD),
1023                                    KEY_REVIMP_UPD, 0, NULL, NULL);
1024
1025                 client_destroy_import(export->exp_imp_reverse);
1026         }
1027
1028         /* for the rest part, we return -ENOTCONN in case of errors
1029          * in order to let client initialize connection again.
1030          */
1031         revimp = export->exp_imp_reverse = class_new_import(target);
1032         if (!revimp) {
1033                 CERROR("fail to alloc new reverse import.\n");
1034                 GOTO(out, rc = -ENOTCONN);
1035         }
1036
1037         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
1038         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
1039         revimp->imp_remote_handle = conn;
1040         revimp->imp_dlm_fake = 1;
1041         revimp->imp_state = LUSTRE_IMP_FULL;
1042
1043         /* unknown versions will be caught in
1044          * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
1045         revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
1046
1047         if ((export->exp_connect_flags & OBD_CONNECT_AT) &&
1048             (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1))
1049                 revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
1050         else
1051                 revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
1052
1053         rc = sptlrpc_import_sec_adapt(revimp, req->rq_svc_ctx, &req->rq_flvr);
1054         if (rc) {
1055                 CERROR("Failed to get sec for reverse import: %d\n", rc);
1056                 export->exp_imp_reverse = NULL;
1057                 class_destroy_import(revimp);
1058         }
1059
1060         class_import_put(revimp);
1061 out:
1062         if (export) {
1063                 spin_lock(&export->exp_lock);
1064                 export->exp_connecting = 0;
1065                 spin_unlock(&export->exp_lock);
1066         }
1067         if (targref)
1068                 class_decref(targref, __FUNCTION__, cfs_current());
1069         if (rc)
1070                 req->rq_status = rc;
1071         RETURN(rc);
1072 }
1073
1074 int target_handle_disconnect(struct ptlrpc_request *req)
1075 {
1076         int rc;
1077         ENTRY;
1078
1079         rc = req_capsule_server_pack(&req->rq_pill);
1080         if (rc)
1081                 RETURN(rc);
1082
1083         /* keep the rq_export around so we can send the reply */
1084         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
1085
1086         RETURN(0);
1087 }
1088
1089 void target_destroy_export(struct obd_export *exp)
1090 {
1091         /* exports created from last_rcvd data, and "fake"
1092            exports created by lctl don't have an import */
1093         if (exp->exp_imp_reverse != NULL)
1094                 client_destroy_import(exp->exp_imp_reverse);
1095
1096         LASSERT(atomic_read(&exp->exp_locks_count) == 0);
1097         LASSERT(atomic_read(&exp->exp_rpc_count) == 0);
1098         LASSERT(atomic_read(&exp->exp_cb_count) == 0);
1099         LASSERT(atomic_read(&exp->exp_replay_count) == 0);
1100 }
1101
1102 /*
1103  * Recovery functions
1104  */
1105 static void target_request_copy_get(struct ptlrpc_request *req)
1106 {
1107         class_export_rpc_get(req->rq_export);
1108         LASSERT(list_empty(&req->rq_list));
1109         CFS_INIT_LIST_HEAD(&req->rq_replay_list);
1110         /* increase refcount to keep request in queue */
1111         LASSERT(atomic_read(&req->rq_refcount));
1112         atomic_inc(&req->rq_refcount);
1113         /** let export know it has replays to be handled */
1114         atomic_inc(&req->rq_export->exp_replay_count);
1115 }
1116
1117 static void target_request_copy_put(struct ptlrpc_request *req)
1118 {
1119         LASSERT(list_empty(&req->rq_replay_list));
1120         LASSERT(atomic_read(&req->rq_export->exp_replay_count) > 0);
1121         atomic_dec(&req->rq_export->exp_replay_count);
1122         class_export_rpc_put(req->rq_export);
1123         ptlrpc_server_drop_request(req);
1124 }
1125
1126 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
1127 {
1128         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
1129         struct obd_export     *exp = req->rq_export;
1130         struct ptlrpc_request *reqiter;
1131         int                    dup = 0;
1132
1133         LASSERT(exp);
1134
1135         spin_lock(&exp->exp_lock);
1136         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
1137                             rq_replay_list) {
1138                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
1139                         dup = 1;
1140                         break;
1141                 }
1142         }
1143
1144         if (dup) {
1145                 /* we expect it with RESENT and REPLAY flags */
1146                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
1147                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
1148                         CERROR("invalid flags %x of resent replay\n",
1149                                lustre_msg_get_flags(req->rq_reqmsg));
1150         } else {
1151                 list_add_tail(&req->rq_replay_list, &exp->exp_req_replay_queue);
1152         }
1153
1154         spin_unlock(&exp->exp_lock);
1155         return dup;
1156 }
1157
1158 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1159 {
1160         LASSERT(!list_empty(&req->rq_replay_list));
1161         LASSERT(req->rq_export);
1162
1163         spin_lock(&req->rq_export->exp_lock);
1164         list_del_init(&req->rq_replay_list);
1165         spin_unlock(&req->rq_export->exp_lock);
1166 }
1167
1168 #ifdef __KERNEL__
1169 static void target_finish_recovery(struct obd_device *obd)
1170 {
1171         ENTRY;
1172         LCONSOLE_INFO("%s: sending delayed replies to recovered clients\n",
1173                       obd->obd_name);
1174
1175         ldlm_reprocess_all_ns(obd->obd_namespace);
1176         spin_lock_bh(&obd->obd_processing_task_lock);
1177         if (!list_empty(&obd->obd_req_replay_queue) ||
1178             !list_empty(&obd->obd_lock_replay_queue) ||
1179             !list_empty(&obd->obd_final_req_queue)) {
1180                 CERROR("%s: Recovery queues ( %s%s%s) are not empty\n",
1181                        obd->obd_name,
1182                        list_empty(&obd->obd_req_replay_queue) ? "" : "req ",
1183                        list_empty(&obd->obd_lock_replay_queue) ? "" : "lock ",
1184                        list_empty(&obd->obd_final_req_queue) ? "" : "final ");
1185                 spin_unlock_bh(&obd->obd_processing_task_lock);
1186                 LBUG();
1187         }
1188         spin_unlock_bh(&obd->obd_processing_task_lock);
1189
1190         obd->obd_recovery_end = cfs_time_current_sec();
1191
1192         /* when recovery finished, cleanup orphans on mds and ost */
1193         if (OBT(obd) && OBP(obd, postrecov)) {
1194                 int rc = OBP(obd, postrecov)(obd);
1195                 if (rc < 0)
1196                         LCONSOLE_WARN("%s: Post recovery failed, rc %d\n",
1197                                       obd->obd_name, rc);
1198         }
1199         EXIT;
1200 }
1201
1202 static void abort_req_replay_queue(struct obd_device *obd)
1203 {
1204         struct ptlrpc_request *req, *n;
1205         struct list_head abort_list;
1206
1207         CFS_INIT_LIST_HEAD(&abort_list);
1208         spin_lock_bh(&obd->obd_processing_task_lock);
1209         list_splice_init(&obd->obd_req_replay_queue, &abort_list);
1210         spin_unlock_bh(&obd->obd_processing_task_lock);
1211         list_for_each_entry_safe(req, n, &abort_list, rq_list) {
1212                 DEBUG_REQ(D_WARNING, req, "aborted:");
1213                 req->rq_status = -ENOTCONN;
1214                 if (ptlrpc_error(req)) {
1215                         DEBUG_REQ(D_ERROR, req,
1216                                   "failed abort_req_reply; skipping");
1217                 }
1218                 target_exp_dequeue_req_replay(req);
1219                 target_request_copy_put(req);
1220         }
1221 }
1222
1223 static void abort_lock_replay_queue(struct obd_device *obd)
1224 {
1225         struct ptlrpc_request *req, *n;
1226         struct list_head abort_list;
1227
1228         CFS_INIT_LIST_HEAD(&abort_list);
1229         spin_lock_bh(&obd->obd_processing_task_lock);
1230         list_splice_init(&obd->obd_lock_replay_queue, &abort_list);
1231         spin_unlock_bh(&obd->obd_processing_task_lock);
1232         list_for_each_entry_safe(req, n, &abort_list, rq_list){
1233                 DEBUG_REQ(D_ERROR, req, "aborted:");
1234                 req->rq_status = -ENOTCONN;
1235                 if (ptlrpc_error(req)) {
1236                         DEBUG_REQ(D_ERROR, req,
1237                                   "failed abort_lock_reply; skipping");
1238                 }
1239                 target_request_copy_put(req);
1240         }
1241 }
1242 #endif
1243
1244 /* Called from a cleanup function if the device is being cleaned up
1245    forcefully.  The exports should all have been disconnected already,
1246    the only thing left to do is
1247      - clear the recovery flags
1248      - cancel the timer
1249      - free queued requests and replies, but don't send replies
1250    Because the obd_stopping flag is set, no new requests should be received.
1251
1252 */
1253 void target_cleanup_recovery(struct obd_device *obd)
1254 {
1255         struct ptlrpc_request *req, *n;
1256         struct list_head clean_list;
1257         ENTRY;
1258
1259         CFS_INIT_LIST_HEAD(&clean_list);
1260         spin_lock_bh(&obd->obd_processing_task_lock);
1261         if (!obd->obd_recovering) {
1262                 spin_unlock_bh(&obd->obd_processing_task_lock);
1263                 EXIT;
1264                 return;
1265         }
1266         obd->obd_recovering = obd->obd_abort_recovery = 0;
1267         target_cancel_recovery_timer(obd);
1268
1269         list_splice_init(&obd->obd_req_replay_queue, &clean_list);
1270         spin_unlock_bh(&obd->obd_processing_task_lock);
1271
1272         list_for_each_entry_safe(req, n, &clean_list, rq_list) {
1273                 LASSERT(req->rq_reply_state == 0);
1274                 target_exp_dequeue_req_replay(req);
1275                 target_request_copy_put(req);
1276         }
1277
1278         spin_lock_bh(&obd->obd_processing_task_lock);
1279         list_splice_init(&obd->obd_lock_replay_queue, &clean_list);
1280         list_splice_init(&obd->obd_final_req_queue, &clean_list);
1281         spin_unlock_bh(&obd->obd_processing_task_lock);
1282
1283         list_for_each_entry_safe(req, n, &clean_list, rq_list){
1284                 LASSERT(req->rq_reply_state == 0);
1285                 target_request_copy_put(req);
1286         }
1287
1288         EXIT;
1289 }
1290
1291 /* obd_processing_task_lock should be held */
1292 void target_cancel_recovery_timer(struct obd_device *obd)
1293 {
1294         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1295         cfs_timer_disarm(&obd->obd_recovery_timer);
1296 }
1297
1298 /* extend = 1 means require at least "duration" seconds left in the timer,
1299    extend = 0 means set the total duration (start_recovery_timer) */
1300 static void reset_recovery_timer(struct obd_device *obd, int duration,
1301                                  int extend)
1302 {
1303         cfs_time_t now = cfs_time_current_sec();
1304         cfs_duration_t left;
1305
1306         spin_lock_bh(&obd->obd_processing_task_lock);
1307         if (!obd->obd_recovering || obd->obd_abort_recovery) {
1308                 spin_unlock_bh(&obd->obd_processing_task_lock);
1309                 return;
1310         }
1311
1312         left = cfs_time_sub(obd->obd_recovery_end, now);
1313
1314         if (extend && (duration > left))
1315                 obd->obd_recovery_timeout += duration - left;
1316         else if (!extend && (duration > obd->obd_recovery_timeout))
1317                 /* Track the client's largest expected replay time */
1318                 obd->obd_recovery_timeout = duration;
1319 #ifdef CRAY_XT3
1320         /*
1321          * If total recovery time already exceed the
1322          * obd_recovery_max_time, then CRAY XT3 will
1323          * abort the recovery
1324          */
1325         if(obd->obd_recovery_timeout > obd->obd_recovery_max_time)
1326                 obd->obd_recovery_timeout = obd->obd_recovery_max_time;
1327 #endif
1328         obd->obd_recovery_end = obd->obd_recovery_start +
1329                                 obd->obd_recovery_timeout;
1330         if (!cfs_timer_is_armed(&obd->obd_recovery_timer) ||
1331             cfs_time_before(now, obd->obd_recovery_end)) {
1332                 left = cfs_time_sub(obd->obd_recovery_end, now);
1333                 cfs_timer_arm(&obd->obd_recovery_timer, cfs_time_shift(left));
1334         }
1335         spin_unlock_bh(&obd->obd_processing_task_lock);
1336         CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
1337                obd->obd_name, (unsigned)left);
1338 }
1339
1340 static void check_and_start_recovery_timer(struct obd_device *obd)
1341 {
1342         spin_lock_bh(&obd->obd_processing_task_lock);
1343         if (cfs_timer_is_armed(&obd->obd_recovery_timer)) {
1344                 spin_unlock_bh(&obd->obd_processing_task_lock);
1345                 return;
1346         }
1347         CDEBUG(D_HA, "%s: starting recovery timer\n", obd->obd_name);
1348         obd->obd_recovery_start = cfs_time_current_sec();
1349         /* minimum */
1350         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1351         spin_unlock_bh(&obd->obd_processing_task_lock);
1352
1353         reset_recovery_timer(obd, obd->obd_recovery_timeout, 0);
1354 }
1355
1356 /* Reset the timer with each new client connection */
1357 /*
1358  * This timer is actually reconnect_timer, which is for making sure
1359  * the total recovery window is at least as big as my reconnect
1360  * attempt timing. So the initial recovery time_out will be set to
1361  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1362  * from client is bigger than this, then the recovery time_out will
1363  * be extended to make sure the client could be reconnected, in the
1364  * process, the timeout from the new client should be ignored.
1365  */
1366
1367 static void
1368 target_start_and_reset_recovery_timer(struct obd_device *obd,
1369                                       struct ptlrpc_request *req,
1370                                       int new_client)
1371 {
1372         int service_time = lustre_msg_get_service_time(req->rq_reqmsg);
1373
1374         if (!new_client && service_time)
1375                 /* Teach server about old server's estimates, as first guess
1376                  * at how long new requests will take. */
1377                 at_add(&req->rq_rqbd->rqbd_service->srv_at_estimate,
1378                        service_time);
1379
1380         check_and_start_recovery_timer(obd);
1381
1382         /* convert the service time to rpc timeout,
1383          * reuse service_time to limit stack usage */
1384         service_time = at_est2timeout(service_time);
1385
1386         /* We expect other clients to timeout within service_time, then try
1387          * to reconnect, then try the failover server.  The max delay between
1388          * connect attempts is SWITCH_MAX + SWITCH_INC + INITIAL */
1389         service_time += 2 * (CONNECTION_SWITCH_MAX + CONNECTION_SWITCH_INC +
1390                              INITIAL_CONNECT_TIMEOUT);
1391         if (service_time > obd->obd_recovery_timeout && !new_client)
1392                 reset_recovery_timer(obd, service_time, 0);
1393 }
1394
1395 #ifdef __KERNEL__
1396
1397 /** Health checking routines */
1398 static inline int exp_connect_healthy(struct obd_export *exp)
1399 {
1400         return (exp->exp_in_recovery);
1401 }
1402
1403 /** if export done req_replay or has replay in queue */
1404 static inline int exp_req_replay_healthy(struct obd_export *exp)
1405 {
1406         return (!exp->exp_req_replay_needed ||
1407                 atomic_read(&exp->exp_replay_count) > 0);
1408 }
1409 /** if export done lock_replay or has replay in queue */
1410 static inline int exp_lock_replay_healthy(struct obd_export *exp)
1411 {
1412         return (!exp->exp_lock_replay_needed ||
1413                 atomic_read(&exp->exp_replay_count) > 0);
1414 }
1415
1416 static inline int exp_vbr_healthy(struct obd_export *exp)
1417 {
1418         return (!exp->exp_vbr_failed);
1419 }
1420
1421 static inline int exp_finished(struct obd_export *exp)
1422 {
1423         return (exp->exp_in_recovery && !exp->exp_lock_replay_needed);
1424 }
1425
1426 /** Checking routines for recovery */
1427 static int check_for_clients(struct obd_device *obd)
1428 {
1429         if (obd->obd_abort_recovery || obd->obd_recovery_expired)
1430                 return 1;
1431         LASSERT(obd->obd_connected_clients <= obd->obd_max_recoverable_clients);
1432         if (obd->obd_no_conn == 0 &&
1433             obd->obd_connected_clients + obd->obd_stale_clients ==
1434             obd->obd_max_recoverable_clients)
1435                 return 1;
1436         return 0;
1437 }
1438
1439 static int check_for_next_transno(struct obd_device *obd)
1440 {
1441         struct ptlrpc_request *req = NULL;
1442         int wake_up = 0, connected, completed, queue_len;
1443         __u64 next_transno, req_transno;
1444         ENTRY;
1445         spin_lock_bh(&obd->obd_processing_task_lock);
1446
1447         if (!list_empty(&obd->obd_req_replay_queue)) {
1448                 req = list_entry(obd->obd_req_replay_queue.next,
1449                                  struct ptlrpc_request, rq_list);
1450                 req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1451         } else {
1452                 req_transno = 0;
1453         }
1454
1455         connected = obd->obd_connected_clients;
1456         completed = connected - atomic_read(&obd->obd_req_replay_clients);
1457         queue_len = obd->obd_requests_queued_for_recovery;
1458         next_transno = obd->obd_next_recovery_transno;
1459
1460         CDEBUG(D_HA, "max: %d, connected: %d, completed: %d, queue_len: %d, "
1461                "req_transno: "LPU64", next_transno: "LPU64"\n",
1462                obd->obd_max_recoverable_clients, connected, completed,
1463                queue_len, req_transno, next_transno);
1464
1465         if (obd->obd_abort_recovery) {
1466                 CDEBUG(D_HA, "waking for aborted recovery\n");
1467                 wake_up = 1;
1468         } else if (obd->obd_recovery_expired) {
1469                 CDEBUG(D_HA, "waking for expired recovery\n");
1470                 wake_up = 1;
1471         } else if (atomic_read(&obd->obd_req_replay_clients) == 0) {
1472                 CDEBUG(D_HA, "waking for completed recovery\n");
1473                 wake_up = 1;
1474         } else if (req_transno == next_transno) {
1475                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1476                 wake_up = 1;
1477         } else if (queue_len == atomic_read(&obd->obd_req_replay_clients)) {
1478                 int d_lvl = D_HA;
1479                 /** handle gaps occured due to lost reply or VBR */
1480                 LASSERTF(req_transno >= next_transno,
1481                          "req_transno: "LPU64", next_transno: "LPU64"\n",
1482                          req_transno, next_transno);
1483                 if (req_transno > obd->obd_last_committed &&
1484                     !obd->obd_version_recov)
1485                         d_lvl = D_ERROR;
1486                 CDEBUG(d_lvl,
1487                        "%s: waking for gap in transno, VBR is %s (skip: "
1488                        LPD64", ql: %d, comp: %d, conn: %d, next: "LPD64
1489                        ", last_committed: "LPD64")\n",
1490                        obd->obd_name, obd->obd_version_recov ? "ON" : "OFF",
1491                        next_transno, queue_len, completed, connected,
1492                        req_transno, obd->obd_last_committed);
1493                 obd->obd_next_recovery_transno = req_transno;
1494                 wake_up = 1;
1495         } else if (OBD_FAIL_CHECK(OBD_FAIL_MDS_RECOVERY_ACCEPTS_GAPS)) {
1496                 CDEBUG(D_HA, "accepting transno gaps is explicitly allowed"
1497                        " by fail_lock, waking up ("LPD64")\n", next_transno);
1498                 obd->obd_next_recovery_transno = req_transno;
1499                 wake_up = 1;
1500         }
1501         spin_unlock_bh(&obd->obd_processing_task_lock);
1502         return wake_up;
1503 }
1504
1505 static int check_for_next_lock(struct obd_device *obd)
1506 {
1507         int wake_up = 0;
1508
1509         spin_lock_bh(&obd->obd_processing_task_lock);
1510         if (!list_empty(&obd->obd_lock_replay_queue)) {
1511                 CDEBUG(D_HA, "waking for next lock\n");
1512                 wake_up = 1;
1513         } else if (atomic_read(&obd->obd_lock_replay_clients) == 0) {
1514                 CDEBUG(D_HA, "waking for completed lock replay\n");
1515                 wake_up = 1;
1516         } else if (obd->obd_abort_recovery) {
1517                 CDEBUG(D_HA, "waking for aborted recovery\n");
1518                 wake_up = 1;
1519         } else if (obd->obd_recovery_expired) {
1520                 CDEBUG(D_HA, "waking for expired recovery\n");
1521                 wake_up = 1;
1522         }
1523         spin_unlock_bh(&obd->obd_processing_task_lock);
1524
1525         return wake_up;
1526 }
1527
1528 /**
1529  * wait for recovery events,
1530  * check its status with help of check_routine
1531  * evict dead clients via health_check
1532  */
1533 static int target_recovery_overseer(struct obd_device *obd,
1534                                     int (*check_routine)(struct obd_device *),
1535                                     int (*health_check)(struct obd_export *))
1536 {
1537         int abort = 0, expired = 1;
1538
1539         do {
1540                 cfs_wait_event(obd->obd_next_transno_waitq, check_routine(obd));
1541                 spin_lock_bh(&obd->obd_processing_task_lock);
1542                 abort = obd->obd_abort_recovery;
1543                 expired = obd->obd_recovery_expired;
1544                 obd->obd_recovery_expired = 0;
1545                 spin_unlock_bh(&obd->obd_processing_task_lock);
1546                 if (abort) {
1547                         CWARN("recovery is aborted, evict exports in recovery\n");
1548                         /** evict exports which didn't finish recovery yet */
1549                         class_disconnect_stale_exports(obd, exp_finished);
1550                 } else if (expired) {
1551                         /** If some clients died being recovered, evict them */
1552                         CDEBUG(D_WARNING, "recovery is timed out, evict stale exports\n");
1553                         /** evict cexports with no replay in queue, they are stalled */
1554                         class_disconnect_stale_exports(obd, health_check);
1555                         /** continue with VBR */
1556                         spin_lock_bh(&obd->obd_processing_task_lock);
1557                         obd->obd_version_recov = 1;
1558                         spin_unlock_bh(&obd->obd_processing_task_lock);
1559                         /**
1560                          * reset timer, recovery will proceed with versions now,
1561                          * timeout is set just to handle reconnection delays
1562                          */
1563                         reset_recovery_timer(obd, RECONNECT_DELAY_MAX, 1);
1564                         /** Wait for recovery events again, after evicting bad clients */
1565                 }
1566         } while (!abort && expired);
1567
1568         return abort;
1569 }
1570
1571 static struct ptlrpc_request *target_next_replay_req(struct obd_device *obd)
1572 {
1573         struct ptlrpc_request *req = NULL;
1574         ENTRY;
1575
1576         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1577                obd->obd_next_recovery_transno);
1578
1579         if (target_recovery_overseer(obd, check_for_next_transno,
1580                                      exp_req_replay_healthy)) {
1581                 abort_req_replay_queue(obd);
1582                 abort_lock_replay_queue(obd);
1583         }
1584
1585         spin_lock_bh(&obd->obd_processing_task_lock);
1586         if (!list_empty(&obd->obd_req_replay_queue)) {
1587                 req = list_entry(obd->obd_req_replay_queue.next,
1588                                  struct ptlrpc_request, rq_list);
1589                 list_del_init(&req->rq_list);
1590                 obd->obd_requests_queued_for_recovery--;
1591                 spin_unlock_bh(&obd->obd_processing_task_lock);
1592         } else {
1593                 spin_unlock_bh(&obd->obd_processing_task_lock);
1594                 LASSERT(list_empty(&obd->obd_req_replay_queue));
1595                 LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
1596                 /** evict exports failed VBR */
1597                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1598         }
1599         RETURN(req);
1600 }
1601
1602 static struct ptlrpc_request *target_next_replay_lock(struct obd_device *obd)
1603 {
1604         struct ptlrpc_request *req = NULL;
1605
1606         CDEBUG(D_HA, "Waiting for lock\n");
1607         if (target_recovery_overseer(obd, check_for_next_lock,
1608                                      exp_lock_replay_healthy))
1609                 abort_lock_replay_queue(obd);
1610
1611         spin_lock_bh(&obd->obd_processing_task_lock);
1612         if (!list_empty(&obd->obd_lock_replay_queue)) {
1613                 req = list_entry(obd->obd_lock_replay_queue.next,
1614                                  struct ptlrpc_request, rq_list);
1615                 list_del_init(&req->rq_list);
1616                 spin_unlock_bh(&obd->obd_processing_task_lock);
1617         } else {
1618                 spin_unlock_bh(&obd->obd_processing_task_lock);
1619                 LASSERT(list_empty(&obd->obd_lock_replay_queue));
1620                 LASSERT(atomic_read(&obd->obd_lock_replay_clients) == 0);
1621                 /** evict exports failed VBR */
1622                 class_disconnect_stale_exports(obd, exp_vbr_healthy);
1623         }
1624         return req;
1625 }
1626
1627 static struct ptlrpc_request *target_next_final_ping(struct obd_device *obd)
1628 {
1629         struct ptlrpc_request *req = NULL;
1630
1631         spin_lock_bh(&obd->obd_processing_task_lock);
1632         if (!list_empty(&obd->obd_final_req_queue)) {
1633                 req = list_entry(obd->obd_final_req_queue.next,
1634                                  struct ptlrpc_request, rq_list);
1635                 list_del_init(&req->rq_list);
1636                 if (req->rq_export->exp_in_recovery) {
1637                         spin_lock(&req->rq_export->exp_lock);
1638                         req->rq_export->exp_in_recovery = 0;
1639                         spin_unlock(&req->rq_export->exp_lock);
1640                 }
1641         }
1642         spin_unlock_bh(&obd->obd_processing_task_lock);
1643         return req;
1644 }
1645
1646 static int handle_recovery_req(struct ptlrpc_thread *thread,
1647                                struct ptlrpc_request *req,
1648                                svc_handler_t handler)
1649 {
1650         int rc;
1651         ENTRY;
1652
1653         rc = lu_context_init(&req->rq_recov_session, LCT_SESSION);
1654         if (rc) {
1655                 CERROR("Failure to initialize session: %d\n", rc);
1656                 GOTO(reqcopy_put, rc);
1657         }
1658         /**
1659          * export can be evicted during recovery, no need to handle replays for
1660          * it after that, discard such request silently
1661          */
1662         if (req->rq_export->exp_disconnected)
1663                 GOTO(reqcopy_put, rc);
1664
1665         req->rq_recov_session.lc_thread = thread;
1666         lu_context_enter(&req->rq_recov_session);
1667         req->rq_svc_thread = thread;
1668         req->rq_svc_thread->t_env->le_ses = &req->rq_recov_session;
1669
1670         /* thread context */
1671         lu_context_enter(&thread->t_env->le_ctx);
1672         (void)handler(req);
1673         lu_context_exit(&thread->t_env->le_ctx);
1674
1675         lu_context_exit(&req->rq_recov_session);
1676         lu_context_fini(&req->rq_recov_session);
1677         /* don't reset timer for final stage */
1678         if (!exp_finished(req->rq_export)) {
1679                 /**
1680                  * Add request timeout to the recovery time so next request from
1681                  * this client may come in recovery time
1682                  */
1683                  reset_recovery_timer(class_exp2obd(req->rq_export),
1684                                       AT_OFF ? obd_timeout :
1685                                       lustre_msg_get_timeout(req->rq_reqmsg), 1);
1686         }
1687 reqcopy_put:
1688         RETURN(rc);
1689 }
1690
1691 static int target_recovery_thread(void *arg)
1692 {
1693         struct lu_target *lut = arg;
1694         struct obd_device *obd = lut->lut_obd;
1695         struct ptlrpc_request *req;
1696         struct target_recovery_data *trd = &obd->obd_recovery_data;
1697         unsigned long delta;
1698         unsigned long flags;
1699         struct lu_env env;
1700         struct ptlrpc_thread fake_svc_thread, *thread = &fake_svc_thread;
1701         int rc = 0;
1702         ENTRY;
1703
1704         cfs_daemonize("tgt_recov");
1705
1706         SIGNAL_MASK_LOCK(current, flags);
1707         sigfillset(&current->blocked);
1708         RECALC_SIGPENDING;
1709         SIGNAL_MASK_UNLOCK(current, flags);
1710
1711         rc = lu_context_init(&env.le_ctx, LCT_MD_THREAD);
1712         if (rc)
1713                 RETURN(rc);
1714
1715         thread->t_env = &env;
1716         env.le_ctx.lc_thread = thread;
1717
1718         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
1719                cfs_curproc_pid());
1720         trd->trd_processing_task = cfs_curproc_pid();
1721
1722         obd->obd_recovering = 1;
1723         complete(&trd->trd_starting);
1724
1725         /* first of all, we have to know the first transno to replay */
1726         if (target_recovery_overseer(obd, check_for_clients,
1727                                      exp_connect_healthy)) {
1728                 abort_req_replay_queue(obd);
1729                 abort_lock_replay_queue(obd);
1730         }
1731
1732         /* next stage: replay requests */
1733         delta = jiffies;
1734         obd->obd_req_replaying = 1;
1735         CDEBUG(D_INFO, "1: request replay stage - %d clients from t"LPU64"\n",
1736                atomic_read(&obd->obd_req_replay_clients),
1737                obd->obd_next_recovery_transno);
1738         while ((req = target_next_replay_req(obd))) {
1739                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1740                 DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s",
1741                           lustre_msg_get_transno(req->rq_reqmsg),
1742                           libcfs_nid2str(req->rq_peer.nid));
1743                 handle_recovery_req(thread, req,
1744                                     trd->trd_recovery_handler);
1745                 /**
1746                  * bz18031: increase next_recovery_transno before
1747                  * target_request_copy_put() will drop exp_rpc reference
1748                  */
1749                 spin_lock_bh(&obd->obd_processing_task_lock);
1750                 obd->obd_next_recovery_transno++;
1751                 spin_unlock_bh(&obd->obd_processing_task_lock);
1752                 target_exp_dequeue_req_replay(req);
1753                 target_request_copy_put(req);
1754                 obd->obd_replayed_requests++;
1755         }
1756
1757         /**
1758          * The second stage: replay locks
1759          */
1760         CDEBUG(D_INFO, "2: lock replay stage - %d clients\n",
1761                atomic_read(&obd->obd_lock_replay_clients));
1762         while ((req = target_next_replay_lock(obd))) {
1763                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1764                 DEBUG_REQ(D_HA, req, "processing lock from %s: ",
1765                           libcfs_nid2str(req->rq_peer.nid));
1766                 handle_recovery_req(thread, req,
1767                                     trd->trd_recovery_handler);
1768                 target_request_copy_put(req);
1769                 obd->obd_replayed_locks++;
1770         }
1771
1772         /**
1773          * The third stage: reply on final pings, at this moment all clients
1774          * must have request in final queue
1775          */
1776         CDEBUG(D_INFO, "3: final stage - process recovery completion pings\n");
1777         /** Update server last boot epoch */
1778         lut_boot_epoch_update(lut);
1779         /* We drop recoverying flag to forward all new requests
1780          * to regular mds_handle() since now */
1781         spin_lock_bh(&obd->obd_processing_task_lock);
1782         obd->obd_recovering = obd->obd_abort_recovery = 0;
1783         target_cancel_recovery_timer(obd);
1784         spin_unlock_bh(&obd->obd_processing_task_lock);
1785         while ((req = target_next_final_ping(obd))) {
1786                 LASSERT(trd->trd_processing_task == cfs_curproc_pid());
1787                 DEBUG_REQ(D_HA, req, "processing final ping from %s: ",
1788                           libcfs_nid2str(req->rq_peer.nid));
1789                 handle_recovery_req(thread, req,
1790                                     trd->trd_recovery_handler);
1791                 target_request_copy_put(req);
1792         }
1793
1794         delta = (jiffies - delta) / HZ;
1795         CDEBUG(D_INFO,"4: recovery completed in %lus - %d/%d reqs/locks\n",
1796               delta, obd->obd_replayed_requests, obd->obd_replayed_locks);
1797         if (delta > obd_timeout * OBD_RECOVERY_FACTOR) {
1798                 CWARN("too long recovery - read logs\n");
1799                 libcfs_debug_dumplog();
1800         }
1801
1802         target_finish_recovery(obd);
1803
1804         lu_context_fini(&env.le_ctx);
1805         trd->trd_processing_task = 0;
1806         complete(&trd->trd_finishing);
1807         RETURN(rc);
1808 }
1809
1810 static int target_start_recovery_thread(struct lu_target *lut,
1811                                         svc_handler_t handler)
1812 {
1813         struct obd_device *obd = lut->lut_obd;
1814         int rc = 0;
1815         struct target_recovery_data *trd = &obd->obd_recovery_data;
1816
1817         memset(trd, 0, sizeof(*trd));
1818         init_completion(&trd->trd_starting);
1819         init_completion(&trd->trd_finishing);
1820         trd->trd_recovery_handler = handler;
1821
1822         if (kernel_thread(target_recovery_thread, lut, 0) > 0) {
1823                 wait_for_completion(&trd->trd_starting);
1824                 LASSERT(obd->obd_recovering != 0);
1825         } else
1826                 rc = -ECHILD;
1827
1828         return rc;
1829 }
1830
1831 void target_stop_recovery_thread(struct obd_device *obd)
1832 {
1833         spin_lock_bh(&obd->obd_processing_task_lock);
1834         if (obd->obd_recovery_data.trd_processing_task > 0) {
1835                 struct target_recovery_data *trd = &obd->obd_recovery_data;
1836                 /** recovery can be done but postrecovery is not yet */
1837                 if (obd->obd_recovering) {
1838                         CERROR("%s: Aborting recovery\n", obd->obd_name);
1839                         obd->obd_abort_recovery = 1;
1840                         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1841                 }
1842                 spin_unlock_bh(&obd->obd_processing_task_lock);
1843                 wait_for_completion(&trd->trd_finishing);
1844         } else {
1845                 spin_unlock_bh(&obd->obd_processing_task_lock);
1846         }
1847 }
1848
1849 void target_recovery_fini(struct obd_device *obd)
1850 {
1851         class_disconnect_exports(obd);
1852         target_stop_recovery_thread(obd);
1853         target_cleanup_recovery(obd);
1854 }
1855 EXPORT_SYMBOL(target_recovery_fini);
1856
1857 static void target_recovery_expired(unsigned long castmeharder)
1858 {
1859         struct obd_device *obd = (struct obd_device *)castmeharder;
1860         CDEBUG(D_HA, "%s: recovery timed out; %d clients are still in recovery"
1861                " after %lds (%d clients connected)\n",
1862                obd->obd_name, atomic_read(&obd->obd_lock_replay_clients),
1863                cfs_time_current_sec()- obd->obd_recovery_start,
1864                obd->obd_connected_clients);
1865
1866         spin_lock_bh(&obd->obd_processing_task_lock);
1867         obd->obd_recovery_expired = 1;
1868         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1869         spin_unlock_bh(&obd->obd_processing_task_lock);
1870 }
1871
1872 void target_recovery_init(struct lu_target *lut, svc_handler_t handler)
1873 {
1874         struct obd_device *obd = lut->lut_obd;
1875         if (obd->obd_max_recoverable_clients == 0) {
1876                 /** Update server last boot epoch */
1877                 lut_boot_epoch_update(lut);
1878                 return;
1879         }
1880
1881         CWARN("RECOVERY: service %s, %d recoverable clients, "
1882               "last_transno "LPU64"\n", obd->obd_name,
1883               obd->obd_max_recoverable_clients, obd->obd_last_committed);
1884         LASSERT(obd->obd_stopping == 0);
1885         obd->obd_next_recovery_transno = obd->obd_last_committed + 1;
1886         obd->obd_recovery_start = 0;
1887         obd->obd_recovery_end = 0;
1888         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1889         /* bz13079: this should be set to desired value for ost but not for mds */
1890         obd->obd_recovery_max_time = OBD_RECOVERY_MAX_TIME;
1891         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
1892         target_start_recovery_thread(lut, handler);
1893 }
1894 EXPORT_SYMBOL(target_recovery_init);
1895
1896 #endif
1897
1898 static int target_process_req_flags(struct obd_device *obd,
1899                                     struct ptlrpc_request *req)
1900 {
1901         struct obd_export *exp = req->rq_export;
1902         LASSERT(exp != NULL);
1903         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1904                 /* client declares he's ready to replay locks */
1905                 spin_lock_bh(&obd->obd_processing_task_lock);
1906                 if (exp->exp_req_replay_needed) {
1907                         LASSERT(atomic_read(&obd->obd_req_replay_clients) > 0);
1908                         spin_lock(&exp->exp_lock);
1909                         exp->exp_req_replay_needed = 0;
1910                         spin_unlock(&exp->exp_lock);
1911                         atomic_dec(&obd->obd_req_replay_clients);
1912                 }
1913                 spin_unlock_bh(&obd->obd_processing_task_lock);
1914         }
1915         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1916                 /* client declares he's ready to complete recovery
1917                  * so, we put the request on th final queue */
1918                 spin_lock_bh(&obd->obd_processing_task_lock);
1919                 if (exp->exp_lock_replay_needed) {
1920                         LASSERT(atomic_read(&obd->obd_lock_replay_clients) > 0);
1921                         spin_lock(&exp->exp_lock);
1922                         exp->exp_lock_replay_needed = 0;
1923                         spin_unlock(&exp->exp_lock);
1924                         atomic_dec(&obd->obd_lock_replay_clients);
1925                 }
1926                 spin_unlock_bh(&obd->obd_processing_task_lock);
1927         }
1928
1929         return 0;
1930 }
1931
1932 int target_queue_recovery_request(struct ptlrpc_request *req,
1933                                   struct obd_device *obd)
1934 {
1935         struct list_head *tmp;
1936         int inserted = 0;
1937         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1938         ENTRY;
1939
1940         if (obd->obd_recovery_data.trd_processing_task == cfs_curproc_pid()) {
1941                 /* Processing the queue right now, don't re-add. */
1942                 RETURN(1);
1943         }
1944
1945         target_process_req_flags(obd, req);
1946
1947         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LOCK_REPLAY_DONE) {
1948                 /* client declares he's ready to complete recovery
1949                  * so, we put the request on th final queue */
1950                 target_request_copy_get(req);
1951                 DEBUG_REQ(D_HA, req, "queue final req");
1952                 spin_lock_bh(&obd->obd_processing_task_lock);
1953                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1954                 if (obd->obd_recovering) {
1955                         list_add_tail(&req->rq_list, &obd->obd_final_req_queue);
1956                 } else {
1957                         spin_unlock_bh(&obd->obd_processing_task_lock);
1958                         target_request_copy_put(req);
1959                         RETURN(obd->obd_stopping ? -ENOTCONN : 1);
1960                 }
1961                 spin_unlock_bh(&obd->obd_processing_task_lock);
1962                 RETURN(0);
1963         }
1964         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_REQ_REPLAY_DONE) {
1965                 /* client declares he's ready to replay locks */
1966                 target_request_copy_get(req);
1967                 DEBUG_REQ(D_HA, req, "queue lock replay req");
1968                 spin_lock_bh(&obd->obd_processing_task_lock);
1969                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1970                 LASSERT(obd->obd_recovering);
1971                 /* usually due to recovery abort */
1972                 if (!req->rq_export->exp_in_recovery) {
1973                         spin_unlock_bh(&obd->obd_processing_task_lock);
1974                         target_request_copy_put(req);
1975                         RETURN(-ENOTCONN);
1976                 }
1977                 LASSERT(req->rq_export->exp_lock_replay_needed);
1978                 list_add_tail(&req->rq_list, &obd->obd_lock_replay_queue);
1979                 spin_unlock_bh(&obd->obd_processing_task_lock);
1980                 RETURN(0);
1981         }
1982
1983         /* CAVEAT EMPTOR: The incoming request message has been swabbed
1984          * (i.e. buflens etc are in my own byte order), but type-dependent
1985          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
1986
1987         if (!transno) {
1988                 CFS_INIT_LIST_HEAD(&req->rq_list);
1989                 DEBUG_REQ(D_HA, req, "not queueing");
1990                 RETURN(1);
1991         }
1992
1993         spin_lock_bh(&obd->obd_processing_task_lock);
1994
1995         /* If we're processing the queue, we want don't want to queue this
1996          * message.
1997          *
1998          * Also, if this request has a transno less than the one we're waiting
1999          * for, we should process it now.  It could (and currently always will)
2000          * be an open request for a descriptor that was opened some time ago.
2001          *
2002          * Also, a resent, replayed request that has already been
2003          * handled will pass through here and be processed immediately.
2004          */
2005         CWARN("Next recovery transno: "LPU64", current: "LPU64", replaying: %i\n",
2006               obd->obd_next_recovery_transno, transno, obd->obd_req_replaying);
2007         if (transno < obd->obd_next_recovery_transno && obd->obd_req_replaying) {
2008                 /* Processing the queue right now, don't re-add. */
2009                 LASSERT(list_empty(&req->rq_list));
2010                 spin_unlock_bh(&obd->obd_processing_task_lock);
2011                 RETURN(1);
2012         }
2013         spin_unlock_bh(&obd->obd_processing_task_lock);
2014
2015         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))
2016                 RETURN(0);
2017
2018         target_request_copy_get(req);
2019         spin_lock_bh(&obd->obd_processing_task_lock);
2020         LASSERT(obd->obd_recovering);
2021         if (!req->rq_export->exp_in_recovery) {
2022                 spin_unlock_bh(&obd->obd_processing_task_lock);
2023                 target_request_copy_put(req);
2024                 RETURN(-ENOTCONN);
2025         }
2026         LASSERT(req->rq_export->exp_req_replay_needed);
2027
2028         if (target_exp_enqueue_req_replay(req)) {
2029                 spin_unlock_bh(&obd->obd_processing_task_lock);
2030                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
2031                 target_request_copy_put(req);
2032                 RETURN(0);
2033         }
2034
2035         /* XXX O(n^2) */
2036         list_for_each(tmp, &obd->obd_req_replay_queue) {
2037                 struct ptlrpc_request *reqiter =
2038                         list_entry(tmp, struct ptlrpc_request, rq_list);
2039
2040                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
2041                         list_add_tail(&req->rq_list, &reqiter->rq_list);
2042                         inserted = 1;
2043                         break;
2044                 }
2045
2046                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
2047                              transno)) {
2048                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
2049                                   "has been claimed by another client");
2050                         spin_unlock_bh(&obd->obd_processing_task_lock);
2051                         target_exp_dequeue_req_replay(req);
2052                         target_request_copy_put(req);
2053                         RETURN(0);
2054                 }
2055         }
2056
2057         if (!inserted)
2058                 list_add_tail(&req->rq_list, &obd->obd_req_replay_queue);
2059
2060         obd->obd_requests_queued_for_recovery++;
2061         cfs_waitq_signal(&obd->obd_next_transno_waitq);
2062         spin_unlock_bh(&obd->obd_processing_task_lock);
2063         RETURN(0);
2064 }
2065
2066 /**
2067  * Packs current SLV and Limit into \a req.
2068  */
2069 int target_pack_pool_reply(struct ptlrpc_request *req)
2070 {
2071         struct obd_device *obd;
2072         ENTRY;
2073
2074         /*
2075          * Check that we still have all structures alive as this may
2076          * be some late rpc in shutdown time.
2077          */
2078         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
2079                      !exp_connect_lru_resize(req->rq_export))) {
2080                 lustre_msg_set_slv(req->rq_repmsg, 0);
2081                 lustre_msg_set_limit(req->rq_repmsg, 0);
2082                 RETURN(0);
2083         }
2084
2085         /*
2086          * OBD is alive here as export is alive, which we checked above.
2087          */
2088         obd = req->rq_export->exp_obd;
2089
2090         read_lock(&obd->obd_pool_lock);
2091         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
2092         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
2093         read_unlock(&obd->obd_pool_lock);
2094
2095         RETURN(0);
2096 }
2097
2098 int target_send_reply_msg(struct ptlrpc_request *req, int rc, int fail_id)
2099 {
2100         if (OBD_FAIL_CHECK_ORSET(fail_id & ~OBD_FAIL_ONCE, OBD_FAIL_ONCE)) {
2101                 DEBUG_REQ(D_ERROR, req, "dropping reply");
2102                 return (-ECOMM);
2103         }
2104
2105         if (unlikely(rc)) {
2106                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
2107                 req->rq_status = rc;
2108                 return (ptlrpc_send_error(req, 1));
2109         } else {
2110                 DEBUG_REQ(D_NET, req, "sending reply");
2111         }
2112
2113         return (ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT));
2114 }
2115
2116 void target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
2117 {
2118         int                        netrc;
2119         struct ptlrpc_reply_state *rs;
2120         struct obd_device         *obd;
2121         struct obd_export         *exp;
2122         struct ptlrpc_service     *svc;
2123         ENTRY;
2124
2125         if (req->rq_no_reply) {
2126                 EXIT;
2127                 return;
2128         }
2129
2130         svc = req->rq_rqbd->rqbd_service;
2131         rs = req->rq_reply_state;
2132         if (rs == NULL || !rs->rs_difficult) {
2133                 /* no notifiers */
2134                 target_send_reply_msg (req, rc, fail_id);
2135                 EXIT;
2136                 return;
2137         }
2138
2139         /* must be an export if locks saved */
2140         LASSERT (req->rq_export != NULL);
2141         /* req/reply consistent */
2142         LASSERT (rs->rs_service == svc);
2143
2144         /* "fresh" reply */
2145         LASSERT (!rs->rs_scheduled);
2146         LASSERT (!rs->rs_scheduled_ever);
2147         LASSERT (!rs->rs_handled);
2148         LASSERT (!rs->rs_on_net);
2149         LASSERT (rs->rs_export == NULL);
2150         LASSERT (list_empty(&rs->rs_obd_list));
2151         LASSERT (list_empty(&rs->rs_exp_list));
2152
2153         exp = class_export_get (req->rq_export);
2154         obd = exp->exp_obd;
2155
2156         /* disable reply scheduling while I'm setting up */
2157         rs->rs_scheduled = 1;
2158         rs->rs_on_net    = 1;
2159         rs->rs_xid       = req->rq_xid;
2160         rs->rs_transno   = req->rq_transno;
2161         rs->rs_export    = exp;
2162         rs->rs_opc       = lustre_msg_get_opc(rs->rs_msg);
2163
2164         spin_lock(&exp->exp_uncommitted_replies_lock);
2165         CDEBUG(D_NET, "rs transno = "LPU64", last committed = "LPU64"\n",
2166                rs->rs_transno, exp->exp_last_committed);
2167         if (rs->rs_transno > exp->exp_last_committed) {
2168                 /* not committed already */
2169                 list_add_tail(&rs->rs_obd_list,
2170                               &exp->exp_uncommitted_replies);
2171         }
2172         spin_unlock (&exp->exp_uncommitted_replies_lock);
2173
2174         spin_lock(&exp->exp_lock);
2175         list_add_tail(&rs->rs_exp_list, &exp->exp_outstanding_replies);
2176         spin_unlock(&exp->exp_lock);
2177
2178         netrc = target_send_reply_msg (req, rc, fail_id);
2179
2180         spin_lock(&svc->srv_lock);
2181
2182         atomic_inc(&svc->srv_n_difficult_replies);
2183
2184         if (netrc != 0) {
2185                 /* error sending: reply is off the net.  Also we need +1
2186                  * reply ref until ptlrpc_handle_rs() is done
2187                  * with the reply state (if the send was successful, there
2188                  * would have been +1 ref for the net, which
2189                  * reply_out_callback leaves alone) */
2190                 rs->rs_on_net = 0;
2191                 ptlrpc_rs_addref(rs);
2192                 atomic_inc (&svc->srv_outstanding_replies);
2193         }
2194
2195         spin_lock(&rs->rs_lock);
2196         if (rs->rs_transno <= exp->exp_last_committed ||
2197             (!rs->rs_on_net && !rs->rs_no_ack) ||
2198              list_empty(&rs->rs_exp_list) ||     /* completed already */
2199              list_empty(&rs->rs_obd_list)) {
2200                 CDEBUG(D_HA, "Schedule reply immediately\n");
2201                 ptlrpc_dispatch_difficult_reply(rs);
2202         } else {
2203                 list_add (&rs->rs_list, &svc->srv_active_replies);
2204                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
2205         }
2206         spin_unlock(&rs->rs_lock);
2207         spin_unlock(&svc->srv_lock);
2208         EXIT;
2209 }
2210
2211 int target_handle_ping(struct ptlrpc_request *req)
2212 {
2213         obd_ping(req->rq_export);
2214         return req_capsule_server_pack(&req->rq_pill);
2215 }
2216
2217 void target_committed_to_req(struct ptlrpc_request *req)
2218 {
2219         struct obd_export *exp = req->rq_export;
2220
2221         if (!exp->exp_obd->obd_no_transno && req->rq_repmsg != NULL)
2222                 lustre_msg_set_last_committed(req->rq_repmsg,
2223                                               exp->exp_last_committed);
2224         else
2225                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
2226                           "%d)", exp->exp_obd->obd_no_transno,
2227                           req->rq_repmsg == NULL);
2228
2229         CDEBUG(D_INFO, "last_committed "LPU64", transno "LPU64", xid "LPU64"\n",
2230                exp->exp_last_committed, req->rq_transno, req->rq_xid);
2231 }
2232 EXPORT_SYMBOL(target_committed_to_req);
2233
2234 int target_handle_qc_callback(struct ptlrpc_request *req)
2235 {
2236         struct obd_quotactl *oqctl;
2237         struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
2238
2239         oqctl = req_capsule_client_get(&req->rq_pill, &RMF_OBD_QUOTACTL);
2240         if (oqctl == NULL) {
2241                 CERROR("Can't unpack obd_quotactl\n");
2242                 RETURN(-EPROTO);
2243         }
2244
2245         cli->cl_qchk_stat = oqctl->qc_stat;
2246
2247         return 0;
2248 }
2249
2250 #ifdef HAVE_QUOTA_SUPPORT
2251 int target_handle_dqacq_callback(struct ptlrpc_request *req)
2252 {
2253 #ifdef __KERNEL__
2254         struct obd_device *obd = req->rq_export->exp_obd;
2255         struct obd_device *master_obd = NULL, *lov_obd = NULL;
2256         struct obd_device_target *obt;
2257         struct lustre_quota_ctxt *qctxt;
2258         struct qunit_data *qdata = NULL;
2259         int rc = 0;
2260         ENTRY;
2261
2262         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_DROP_QUOTA_REQ))
2263                 RETURN(rc);
2264
2265         rc = req_capsule_server_pack(&req->rq_pill);
2266         if (rc) {
2267                 CERROR("packing reply failed!: rc = %d\n", rc);
2268                 RETURN(rc);
2269         }
2270
2271         LASSERT(req->rq_export);
2272
2273         qdata = quota_get_qdata(req, QUOTA_REQUEST, QUOTA_EXPORT);
2274         if (IS_ERR(qdata)) {
2275                 rc = PTR_ERR(qdata);
2276                 CDEBUG(D_ERROR, "Can't unpack qunit_data(rc: %d)\n", rc);
2277                 req->rq_status = rc;
2278                 GOTO(out, rc);
2279         }
2280
2281         /* we use the observer */
2282         if (obd_pin_observer(obd, &lov_obd) ||
2283             obd_pin_observer(lov_obd, &master_obd)) {
2284                 CERROR("Can't find the observer, it is recovering\n");
2285                 req->rq_status = -EAGAIN;
2286                 GOTO(out, rc);
2287         }
2288
2289         obt = &master_obd->u.obt;
2290         qctxt = &obt->obt_qctxt;
2291
2292         if (!qctxt->lqc_setup || !qctxt->lqc_valid) {
2293                 /* quota_type has not been processed yet, return EAGAIN
2294                  * until we know whether or not quotas are supposed to
2295                  * be enabled */
2296                 CDEBUG(D_QUOTA, "quota_type not processed yet, return "
2297                        "-EAGAIN\n");
2298                 req->rq_status = -EAGAIN;
2299                 GOTO(out, rc);
2300         }
2301
2302         down_read(&obt->obt_rwsem);
2303         if (qctxt->lqc_lqs_hash == NULL) {
2304                 up_read(&obt->obt_rwsem);
2305                 /* quota_type has not been processed yet, return EAGAIN
2306                  * until we know whether or not quotas are supposed to
2307                  * be enabled */
2308                 CDEBUG(D_QUOTA, "quota_ctxt is not ready yet, return "
2309                        "-EAGAIN\n");
2310                 req->rq_status = -EAGAIN;
2311                 GOTO(out, rc);
2312         }
2313
2314         LASSERT(qctxt->lqc_handler);
2315         rc = qctxt->lqc_handler(master_obd, qdata,
2316                                 lustre_msg_get_opc(req->rq_reqmsg));
2317         up_read(&obt->obt_rwsem);
2318         if (rc && rc != -EDQUOT)
2319                 CDEBUG(rc == -EBUSY  ? D_QUOTA : D_ERROR,
2320                        "dqacq/dqrel failed! (rc:%d)\n", rc);
2321         req->rq_status = rc;
2322
2323         rc = quota_copy_qdata(req, qdata, QUOTA_REPLY, QUOTA_EXPORT);
2324         if (rc < 0) {
2325                 CERROR("Can't pack qunit_data(rc: %d)\n", rc);
2326                 GOTO(out, rc);
2327         }
2328
2329         /* Block the quota req. b=14840 */
2330         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_BLOCK_QUOTA_REQ, obd_timeout);
2331         EXIT;
2332
2333 out:
2334         if (master_obd)
2335                 obd_unpin_observer(lov_obd);
2336         if (lov_obd)
2337                 obd_unpin_observer(obd);
2338
2339         rc = ptlrpc_reply(req);
2340         return rc;
2341 #else
2342         return 0;
2343 #endif /* !__KERNEL__ */
2344 }
2345 #endif /* HAVE_QUOTA_SUPPORT */
2346
2347 /* Send a remote set_info_async.
2348  * This may go from client to server or server to client
2349  */
2350 int target_set_info_rpc(struct obd_import *imp, int opcode,
2351                         obd_count keylen, void *key,
2352                         obd_count vallen, void *val,
2353                         struct ptlrpc_request_set *set)
2354 {
2355         struct ptlrpc_request *req;
2356         char                  *tmp;
2357         int                    rc;
2358         ENTRY;
2359
2360         req = ptlrpc_request_alloc(imp, &RQF_OBD_SET_INFO);
2361         if (req == NULL)
2362                 RETURN(-ENOMEM);
2363
2364         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY,
2365                              RCL_CLIENT, keylen);
2366         req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_VAL,
2367                              RCL_CLIENT, vallen);
2368         rc = ptlrpc_request_pack(req, LUSTRE_OBD_VERSION, opcode);
2369         if (rc) {
2370                 ptlrpc_request_free(req);
2371                 RETURN(rc);
2372         }
2373
2374         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY);
2375         memcpy(tmp, key, keylen);
2376         tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL);
2377         memcpy(tmp, val, vallen);
2378
2379         ptlrpc_request_set_replen(req);
2380
2381         if (set) {
2382                 ptlrpc_set_add_req(set, req);
2383                 ptlrpc_check_set(NULL, set);
2384         } else {
2385                 rc = ptlrpc_queue_wait(req);
2386                 ptlrpc_req_finished(req);
2387         }
2388
2389         RETURN(rc);
2390 }
2391 EXPORT_SYMBOL(target_set_info_rpc);
2392
2393
2394 ldlm_mode_t lck_compat_array[] = {
2395         [LCK_EX] LCK_COMPAT_EX,
2396         [LCK_PW] LCK_COMPAT_PW,
2397         [LCK_PR] LCK_COMPAT_PR,
2398         [LCK_CW] LCK_COMPAT_CW,
2399         [LCK_CR] LCK_COMPAT_CR,
2400         [LCK_NL] LCK_COMPAT_NL,
2401         [LCK_GROUP] LCK_COMPAT_GROUP,
2402         [LCK_COS] LCK_COMPAT_COS,
2403 };
2404
2405 /**
2406  * Rather arbitrary mapping from LDLM error codes to errno values. This should
2407  * not escape to the user level.
2408  */
2409 int ldlm_error2errno(ldlm_error_t error)
2410 {
2411         int result;
2412
2413         switch (error) {
2414         case ELDLM_OK:
2415                 result = 0;
2416                 break;
2417         case ELDLM_LOCK_CHANGED:
2418                 result = -ESTALE;
2419                 break;
2420         case ELDLM_LOCK_ABORTED:
2421                 result = -ENAVAIL;
2422                 break;
2423         case ELDLM_LOCK_REPLACED:
2424                 result = -ESRCH;
2425                 break;
2426         case ELDLM_NO_LOCK_DATA:
2427                 result = -ENOENT;
2428                 break;
2429         case ELDLM_NAMESPACE_EXISTS:
2430                 result = -EEXIST;
2431                 break;
2432         case ELDLM_BAD_NAMESPACE:
2433                 result = -EBADF;
2434                 break;
2435         default:
2436                 if (((int)error) < 0)  /* cast to signed type */
2437                         result = error; /* as ldlm_error_t can be unsigned */
2438                 else {
2439                         CERROR("Invalid DLM result code: %i\n", error);
2440                         result = -EPROTO;
2441                 }
2442         }
2443         return result;
2444 }
2445 EXPORT_SYMBOL(ldlm_error2errno);
2446
2447 /**
2448  * Dual to ldlm_error2errno(): maps errno values back to ldlm_error_t.
2449  */
2450 ldlm_error_t ldlm_errno2error(int err_no)
2451 {
2452         int error;
2453
2454         switch (err_no) {
2455         case 0:
2456                 error = ELDLM_OK;
2457                 break;
2458         case -ESTALE:
2459                 error = ELDLM_LOCK_CHANGED;
2460                 break;
2461         case -ENAVAIL:
2462                 error = ELDLM_LOCK_ABORTED;
2463                 break;
2464         case -ESRCH:
2465                 error = ELDLM_LOCK_REPLACED;
2466                 break;
2467         case -ENOENT:
2468                 error = ELDLM_NO_LOCK_DATA;
2469                 break;
2470         case -EEXIST:
2471                 error = ELDLM_NAMESPACE_EXISTS;
2472                 break;
2473         case -EBADF:
2474                 error = ELDLM_BAD_NAMESPACE;
2475                 break;
2476         default:
2477                 error = err_no;
2478         }
2479         return error;
2480 }
2481 EXPORT_SYMBOL(ldlm_errno2error);
2482
2483 #if LUSTRE_TRACKS_LOCK_EXP_REFS
2484 void ldlm_dump_export_locks(struct obd_export *exp)
2485 {
2486         spin_lock(&exp->exp_locks_list_guard);
2487         if (!list_empty(&exp->exp_locks_list)) {
2488             struct ldlm_lock *lock;
2489
2490             CERROR("dumping locks for export %p,"
2491                    "ignore if the unmount doesn't hang\n", exp);
2492             list_for_each_entry(lock, &exp->exp_locks_list, l_exp_refs_link)
2493                 ldlm_lock_dump(D_ERROR, lock, 0);
2494         }
2495         spin_unlock(&exp->exp_locks_list_guard);
2496 }
2497 #endif