lustre/ldlm/ldlm_lib.c

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