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  *  Copyright (c) 2003 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of the Lustre file system, http://www.lustre.org
   7  *   Lustre is a trademark of Cluster File Systems, Inc.
   8  *
   9  *   You may have signed or agreed to another license before downloading
  10  *   this software.  If so, you are bound by the terms and conditions
  11  *   of that agreement, and the following does not apply to you.  See the
  12  *   LICENSE file included with this distribution for more information.
  13  *
  14  *   If you did not agree to a different license, then this copy of Lustre
  15  *   is open source software; you can redistribute it and/or modify it
  16  *   under the terms of version 2 of the GNU General Public License as
  17  *   published by the Free Software Foundation.
  18  *
  19  *   In either case, Lustre is distributed in the hope that it will be
  20  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  21  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *   license text for more details.
  23  */
  24
  25 #ifndef EXPORT_SYMTAB
  26 # define EXPORT_SYMTAB
  27 #endif
  28 #define DEBUG_SUBSYSTEM S_LDLM
  29
  30 #ifdef __KERNEL__
  31 # include <libcfs/libcfs.h>
  32 #else
  33 # include <liblustre.h>
  34 #endif
  35 #include <obd.h>
  36 #include <lustre_mds.h>
  37 #include <lustre_dlm.h>
  38 #include <lustre_net.h>
  39 #include "ldlm_internal.h"
  40
  41 /* @priority: if non-zero, move the selected to the list head
  42  * @create: if zero, only search in existed connections
  43  */
  44 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  45                            int priority, int create)
  46 {
  47         struct ptlrpc_connection *ptlrpc_conn;
  48         struct obd_import_conn *imp_conn = NULL, *item;
  49         int rc = 0;
  50         ENTRY;
  51
  52         if (!create && !priority) {
  53                 CDEBUG(D_HA, "Nothing to do\n");
  54                 RETURN(-EINVAL);
  55         }
  56
  57         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
  58         if (!ptlrpc_conn) {
  59                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  60                 RETURN (-ENOENT);
  61         }
  62
  63         if (create) {
  64                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  65                 if (!imp_conn) {
  66                         GOTO(out_put, rc = -ENOMEM);
  67                 }
  68         }
  69
  70         spin_lock(&imp->imp_lock);
  71         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  72                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  73                         if (priority) {
  74                                 list_del(&item->oic_item);
  75                                 list_add(&item->oic_item, &imp->imp_conn_list);
  76                                 item->oic_last_attempt = 0;
  77                         }
  78                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  79                                imp, imp->imp_obd->obd_name, uuid->uuid,
  80                                (priority ? ", moved to head" : ""));
  81                         spin_unlock(&imp->imp_lock);
  82                         GOTO(out_free, rc = 0);
  83                 }
  84         }
  85         /* not found */
  86         if (create) {
  87                 imp_conn->oic_conn = ptlrpc_conn;
  88                 imp_conn->oic_uuid = *uuid;
  89                 item->oic_last_attempt = 0;
  90                 if (priority)
  91                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
  92                 else
  93                         list_add_tail(&imp_conn->oic_item, &imp->imp_conn_list);
  94                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
  95                        imp, imp->imp_obd->obd_name, uuid->uuid,
  96                        (priority ? "head" : "tail"));
  97         } else {
  98                 spin_unlock(&imp->imp_lock);
  99                 GOTO(out_free, rc = -ENOENT);
 100
 101         }
 102
 103         spin_unlock(&imp->imp_lock);
 104         RETURN(0);
 105 out_free:
 106         if (imp_conn)
 107                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 108 out_put:
 109         ptlrpc_put_connection(ptlrpc_conn);
 110         RETURN(rc);
 111 }
 112
 113 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 114 {
 115         return import_set_conn(imp, uuid, 1, 0);
 116 }
 117
 118 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 119                            int priority)
 120 {
 121         return import_set_conn(imp, uuid, priority, 1);
 122 }
 123
 124 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 125 {
 126         struct obd_import_conn *imp_conn;
 127         struct obd_export *dlmexp;
 128         int rc = -ENOENT;
 129         ENTRY;
 130
 131         spin_lock(&imp->imp_lock);
 132         if (list_empty(&imp->imp_conn_list)) {
 133                 LASSERT(!imp->imp_connection);
 134                 GOTO(out, rc);
 135         }
 136
 137         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 138                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 139                         continue;
 140                 LASSERT(imp_conn->oic_conn);
 141
 142                 /* is current conn? */
 143                 if (imp_conn == imp->imp_conn_current) {
 144                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 145
 146                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 147                             imp->imp_state != LUSTRE_IMP_DISCON) {
 148                                 CERROR("can't remove current connection\n");
 149                                 GOTO(out, rc = -EBUSY);
 150                         }
 151
 152                         ptlrpc_put_connection(imp->imp_connection);
 153                         imp->imp_connection = NULL;
 154
 155                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 156                         if (dlmexp && dlmexp->exp_connection) {
 157                                 LASSERT(dlmexp->exp_connection ==
 158                                         imp_conn->oic_conn);
 159                                 ptlrpc_put_connection(dlmexp->exp_connection);
 160                                 dlmexp->exp_connection = NULL;
 161                         }
 162                 }
 163
 164                 list_del(&imp_conn->oic_item);
 165                 ptlrpc_put_connection(imp_conn->oic_conn);
 166                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 167                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 168                        imp, imp->imp_obd->obd_name, uuid->uuid);
 169                 rc = 0;
 170                 break;
 171         }
 172 out:
 173         spin_unlock(&imp->imp_lock);
 174         if (rc == -ENOENT)
 175                 CERROR("connection %s not found\n", uuid->uuid);
 176         RETURN(rc);
 177 }
 178
 179 /* configure an RPC client OBD device
 180  *
 181  * lcfg parameters:
 182  * 1 - client UUID
 183  * 2 - server UUID
 184  * 3 - inactive-on-startup
 185  */
 186 int client_obd_setup(struct obd_device *obddev, obd_count len, void *buf)
 187 {
 188         struct lustre_cfg* lcfg = buf;
 189         struct client_obd *cli = &obddev->u.cli;
 190         struct obd_import *imp;
 191         struct obd_uuid server_uuid;
 192         int rq_portal, rp_portal, connect_op;
 193         char *name = obddev->obd_type->typ_name;
 194         int rc;
 195         ENTRY;
 196
 197         /* In a more perfect world, we would hang a ptlrpc_client off of
 198          * obd_type and just use the values from there. */
 199         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 200 #ifdef __KERNEL__
 201                 /* Can be removed in Lustre 1.8, for compatibility only */
 202                 rq_portal = OST_IO_PORTAL;
 203 #else
 204                 rq_portal = OST_REQUEST_PORTAL;
 205 #endif
 206                 rp_portal = OSC_REPLY_PORTAL;
 207                 connect_op = OST_CONNECT;
 208         } else if (!strcmp(name, LUSTRE_MDC_NAME)) {
 209                 rq_portal = MDS_REQUEST_PORTAL;
 210                 rp_portal = MDC_REPLY_PORTAL;
 211                 connect_op = MDS_CONNECT;
 212         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 213                 rq_portal = MGS_REQUEST_PORTAL;
 214                 rp_portal = MGC_REPLY_PORTAL;
 215                 connect_op = MGS_CONNECT;
 216         } else {
 217                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 218                        name);
 219                 RETURN(-EINVAL);
 220         }
 221
 222         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 223                 CERROR("requires a TARGET UUID\n");
 224                 RETURN(-EINVAL);
 225         }
 226
 227         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 228                 CERROR("client UUID must be less than 38 characters\n");
 229                 RETURN(-EINVAL);
 230         }
 231
 232         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 233                 CERROR("setup requires a SERVER UUID\n");
 234                 RETURN(-EINVAL);
 235         }
 236
 237         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 238                 CERROR("target UUID must be less than 38 characters\n");
 239                 RETURN(-EINVAL);
 240         }
 241
 242         init_rwsem(&cli->cl_sem);
 243         sema_init(&cli->cl_mgc_sem, 1);
 244         cli->cl_conn_count = 0;
 245         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 246                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 247                      sizeof(server_uuid)));
 248
 249         cli->cl_dirty = 0;
 250         cli->cl_avail_grant = 0;
 251         /* FIXME: should limit this for the sum of all cl_dirty_max */
 252         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 253         if (cli->cl_dirty_max >> CFS_PAGE_SHIFT > num_physpages / 8)
 254                 cli->cl_dirty_max = num_physpages << (CFS_PAGE_SHIFT - 3);
 255         CFS_INIT_LIST_HEAD(&cli->cl_cache_waiters);
 256         CFS_INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 257         CFS_INIT_LIST_HEAD(&cli->cl_loi_write_list);
 258         CFS_INIT_LIST_HEAD(&cli->cl_loi_read_list);
 259         client_obd_list_lock_init(&cli->cl_loi_list_lock);
 260         cli->cl_r_in_flight = 0;
 261         cli->cl_w_in_flight = 0;
 262         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 263         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 264         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 265         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 266         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 267         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 268         cfs_waitq_init(&cli->cl_destroy_waitq);
 269         atomic_set(&cli->cl_destroy_in_flight, 0);
 270 #ifdef ENABLE_CHECKSUM
 271         /* Turn on checksumming by default. */
 272         cli->cl_checksum = 1;
 273         /*
 274          * The supported checksum types will be worked out at connect time
 275          * Set cl_chksum* to CRC32 for now to avoid returning screwed info
 276          * through procfs.
 277          */
 278         cli->cl_cksum_type = cli->cl_supp_cksum_types = OBD_CKSUM_CRC32;
 279 #endif
 280         atomic_set(&cli->cl_resends, OSC_DEFAULT_RESENDS);
 281
 282         /* This value may be changed at connect time in
 283            ptlrpc_connect_interpret. */
 284         cli->cl_max_pages_per_rpc = min((int)PTLRPC_MAX_BRW_PAGES,
 285                                         (int)(1024 * 1024 >> CFS_PAGE_SHIFT));
 286
 287         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 288                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
 289         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 128 /* MB */) {
 290                 cli->cl_max_rpcs_in_flight = 2;
 291         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 256 /* MB */) {
 292                 cli->cl_max_rpcs_in_flight = 3;
 293         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 512 /* MB */) {
 294                 cli->cl_max_rpcs_in_flight = 4;
 295         } else {
 296                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 297         }
 298         rc = ldlm_get_ref();
 299         if (rc) {
 300                 CERROR("ldlm_get_ref failed: %d\n", rc);
 301                 GOTO(err, rc);
 302         }
 303
 304         ptlrpc_init_client(rq_portal, rp_portal, name,
 305                            &obddev->obd_ldlm_client);
 306
 307         imp = class_new_import(obddev);
 308         if (imp == NULL)
 309                 GOTO(err_ldlm, rc = -ENOENT);
 310         imp->imp_client = &obddev->obd_ldlm_client;
 311         imp->imp_connect_op = connect_op;
 312         imp->imp_initial_recov = 1;
 313         imp->imp_initial_recov_bk = 0;
 314         CFS_INIT_LIST_HEAD(&imp->imp_pinger_chain);
 315         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 316                LUSTRE_CFG_BUFLEN(lcfg, 1));
 317         class_import_put(imp);
 318
 319         rc = client_import_add_conn(imp, &server_uuid, 1);
 320         if (rc) {
 321                 CERROR("can't add initial connection\n");
 322                 GOTO(err_import, rc);
 323         }
 324
 325         cli->cl_import = imp;
 326         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 327         cli->cl_max_mds_easize = sizeof(struct lov_mds_md);
 328         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 329
 330         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 331                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 332                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 333                                name, obddev->obd_name,
 334                                cli->cl_target_uuid.uuid);
 335                         spin_lock(&imp->imp_lock);
 336                         imp->imp_invalid = 1;
 337                         spin_unlock(&imp->imp_lock);
 338                 }
 339         }
 340
 341         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 342
 343         RETURN(rc);
 344
 345 err_import:
 346         class_destroy_import(imp);
 347 err_ldlm:
 348         ldlm_put_ref();
 349 err:
 350         RETURN(rc);
 351
 352 }
 353
 354 int client_obd_cleanup(struct obd_device *obddev)
 355 {
 356         ENTRY;
 357         ldlm_put_ref();
 358         RETURN(0);
 359 }
 360
 361 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 362 int client_connect_import(struct lustre_handle *dlm_handle,
 363                           struct obd_device *obd, struct obd_uuid *cluuid,
 364                           struct obd_connect_data *data, void *localdata)
 365 {
 366         struct client_obd *cli = &obd->u.cli;
 367         struct obd_import *imp = cli->cl_import;
 368         struct obd_export *exp;
 369         struct obd_connect_data *ocd;
 370         struct ldlm_namespace *to_be_freed = NULL;
 371         int rc;
 372         ENTRY;
 373
 374         down_write(&cli->cl_sem);
 375         rc = class_connect(dlm_handle, obd, cluuid);
 376         if (rc)
 377                 GOTO(out_sem, rc);
 378
 379         cli->cl_conn_count++;
 380         if (cli->cl_conn_count > 1)
 381                 GOTO(out_sem, rc);
 382         exp = class_conn2export(dlm_handle);
 383
 384         if (obd->obd_namespace != NULL)
 385                 CERROR("already have namespace!\n");
 386         obd->obd_namespace = ldlm_namespace_new(obd, obd->obd_name,
 387                                                 LDLM_NAMESPACE_CLIENT,
 388                                                 LDLM_NAMESPACE_GREEDY);
 389         if (obd->obd_namespace == NULL)
 390                 GOTO(out_disco, rc = -ENOMEM);
 391
 392         imp->imp_dlm_handle = *dlm_handle;
 393         rc = ptlrpc_init_import(imp);
 394         if (rc != 0)
 395                 GOTO(out_ldlm, rc);
 396
 397         ocd = &imp->imp_connect_data;
 398         if (data) {
 399                 *ocd = *data;
 400                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 401         }
 402
 403         rc = ptlrpc_connect_import(imp, NULL);
 404         if (rc != 0) {
 405                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 406                 GOTO(out_ldlm, rc);
 407         }
 408         LASSERT(exp->exp_connection);
 409
 410         if (data) {
 411                 LASSERT((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 412                         ocd->ocd_connect_flags);
 413                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 414         }
 415
 416         ptlrpc_pinger_add_import(imp);
 417         EXIT;
 418
 419         if (rc) {
 420 out_ldlm:
 421                 ldlm_namespace_free_prior(obd->obd_namespace, imp, 0);
 422                 to_be_freed = obd->obd_namespace;
 423                 obd->obd_namespace = NULL;
 424 out_disco:
 425                 cli->cl_conn_count--;
 426                 class_disconnect(exp);
 427         } else {
 428                 class_export_put(exp);
 429         }
 430 out_sem:
 431         up_write(&cli->cl_sem);
 432         if (to_be_freed)
 433                 ldlm_namespace_free_post(to_be_freed);
 434         return rc;
 435 }
 436
 437 int client_disconnect_export(struct obd_export *exp)
 438 {
 439         struct obd_device *obd = class_exp2obd(exp);
 440         struct client_obd *cli;
 441         struct obd_import *imp;
 442         struct ldlm_namespace *to_be_freed = NULL;
 443         int rc = 0, err;
 444         ENTRY;
 445
 446         if (!obd) {
 447                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 448                        exp, exp ? exp->exp_handle.h_cookie : -1);
 449                 RETURN(-EINVAL);
 450         }
 451
 452         cli = &obd->u.cli;
 453         imp = cli->cl_import;
 454
 455         down_write(&cli->cl_sem);
 456         if (!cli->cl_conn_count) {
 457                 CERROR("disconnecting disconnected device (%s)\n",
 458                        obd->obd_name);
 459                 GOTO(out_sem, rc = -EINVAL);
 460         }
 461
 462         cli->cl_conn_count--;
 463         if (cli->cl_conn_count)
 464                 GOTO(out_no_disconnect, rc = 0);
 465
 466         /* Mark import deactivated now, so we don't try to reconnect if any
 467          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
 468          * fully deactivate the import, or that would drop all requests. */
 469         spin_lock(&imp->imp_lock);
 470         imp->imp_deactive = 1;
 471         spin_unlock(&imp->imp_lock);
 472
 473         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 474          * delete it regardless.  (It's safe to delete an import that was
 475          * never added.) */
 476         (void)ptlrpc_pinger_del_import(imp);
 477
 478         if (obd->obd_namespace != NULL) {
 479                 /* obd_force == local only */
 480                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 481                                        obd->obd_force ? LDLM_FL_LOCAL_ONLY:0,
 482                                        NULL);
 483                 ldlm_namespace_free_prior(obd->obd_namespace, imp,
 484                                           obd->obd_force);
 485                 to_be_freed = obd->obd_namespace;
 486         }
 487
 488         rc = ptlrpc_disconnect_import(imp, 0);
 489
 490         ptlrpc_invalidate_import(imp);
 491         /* set obd_namespace to NULL only after invalidate, because we can have
 492          * some connect requests in flight, and his need store a connect flags
 493          * in obd_namespace. bug 14260 */
 494         obd->obd_namespace = NULL;
 495
 496         ptlrpc_free_rq_pool(imp->imp_rq_pool);
 497         class_destroy_import(imp);
 498         cli->cl_import = NULL;
 499
 500         EXIT;
 501  out_no_disconnect:
 502         err = class_disconnect(exp);
 503         if (!rc && err)
 504                 rc = err;
 505  out_sem:
 506         up_write(&cli->cl_sem);
 507         if (to_be_freed)
 508                 ldlm_namespace_free_post(to_be_freed);
 509         RETURN(rc);
 510 }
 511
 512 /* --------------------------------------------------------------------------
 513  * from old lib/target.c
 514  * -------------------------------------------------------------------------- */
 515
 516 int target_handle_reconnect(struct lustre_handle *conn, struct obd_export *exp,
 517                             struct obd_uuid *cluuid)
 518 {
 519         ENTRY;
 520         if (exp->exp_connection && exp->exp_imp_reverse) {
 521                 struct lustre_handle *hdl;
 522                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 523                 /* Might be a re-connect after a partition. */
 524                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 525                         CWARN("%s: %s reconnecting\n", exp->exp_obd->obd_name,
 526                               cluuid->uuid);
 527                         conn->cookie = exp->exp_handle.h_cookie;
 528                         /* target_handle_connect() treats EALREADY and
 529                          * -EALREADY differently.  EALREADY means we are
 530                          * doing a valid reconnect from the same client. */
 531                         RETURN(EALREADY);
 532                 } else {
 533                         CERROR("%s reconnecting from %s, "
 534                                "handle mismatch (ours "LPX64", theirs "
 535                                LPX64")\n", cluuid->uuid,
 536                                exp->exp_connection->c_remote_uuid.uuid,
 537                                hdl->cookie, conn->cookie);
 538                         memset(conn, 0, sizeof *conn);
 539                         /* target_handle_connect() treats EALREADY and
 540                          * -EALREADY differently.  -EALREADY is an error
 541                          * (same UUID, different handle). */
 542                         RETURN(-EALREADY);
 543                 }
 544         }
 545
 546         conn->cookie = exp->exp_handle.h_cookie;
 547         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
 548                cluuid->uuid, exp, conn->cookie);
 549         RETURN(0);
 550 }
 551
 552 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
 553                           int error)
 554 {
 555         struct obd_export *exp = cb_data;
 556
 557         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 558                obd->obd_name, exp->exp_client_uuid.uuid);
 559
 560         spin_lock(&exp->exp_lock);
 561         exp->exp_need_sync = 0;
 562         spin_unlock(&exp->exp_lock);
 563 }
 564 EXPORT_SYMBOL(target_client_add_cb);
 565
 566 static void
 567 target_start_and_reset_recovery_timer(struct obd_device *obd,
 568                                       svc_handler_t handler,
 569                                       struct ptlrpc_request *req,
 570                                       int new_client);
 571
 572 int target_handle_connect(struct ptlrpc_request *req, svc_handler_t handler)
 573 {
 574         struct obd_device *target, *targref = NULL;
 575         struct obd_export *export = NULL;
 576         struct obd_import *revimp;
 577         struct lustre_handle conn;
 578         struct obd_uuid tgtuuid;
 579         struct obd_uuid cluuid;
 580         struct obd_uuid remote_uuid;
 581         char *str, *tmp;
 582         int rc = 0, abort_recovery;
 583         struct obd_connect_data *data;
 584         int size[2] = { sizeof(struct ptlrpc_body), sizeof(*data) };
 585         lnet_nid_t *client_nid = NULL;
 586         ENTRY;
 587
 588         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 589
 590         lustre_set_req_swabbed(req, REQ_REC_OFF);
 591         str = lustre_msg_string(req->rq_reqmsg, REQ_REC_OFF, sizeof(tgtuuid)-1);
 592         if (str == NULL) {
 593                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect");
 594                 GOTO(out, rc = -EINVAL);
 595         }
 596
 597         obd_str2uuid (&tgtuuid, str);
 598         target = class_uuid2obd(&tgtuuid);
 599         /* COMPAT_146 */
 600         /* old (pre 1.6) lustre_process_log tries to connect to mdsname
 601            (eg. mdsA) instead of uuid. */
 602         if (!target) {
 603                 snprintf((char *)tgtuuid.uuid, sizeof(tgtuuid), "%s_UUID", str);
 604                 target = class_uuid2obd(&tgtuuid);
 605         }
 606         if (!target)
 607                 target = class_name2obd(str);
 608         /* end COMPAT_146 */
 609
 610         if (!target || target->obd_stopping || !target->obd_set_up) {
 611                 LCONSOLE_ERROR_MSG(0x137, "UUID '%s' is not available "
 612                                    " for connect (%s)\n", str,
 613                                    !target ? "no target" :
 614                                    (target->obd_stopping ? "stopping" :
 615                                    "not set up"));
 616                 GOTO(out, rc = -ENODEV);
 617         }
 618
 619         if (target->obd_no_conn) {
 620                 LCONSOLE_WARN("%s: temporarily refusing client connection "
 621                               "from %s\n", target->obd_name,
 622                               libcfs_nid2str(req->rq_peer.nid));
 623                 GOTO(out, rc = -EAGAIN);
 624         }
 625
 626         /* Make sure the target isn't cleaned up while we're here. Yes,
 627            there's still a race between the above check and our incref here.
 628            Really, class_uuid2obd should take the ref. */
 629         targref = class_incref(target);
 630
 631         lustre_set_req_swabbed(req, REQ_REC_OFF + 1);
 632         str = lustre_msg_string(req->rq_reqmsg, REQ_REC_OFF + 1,
 633                                 sizeof(cluuid) - 1);
 634         if (str == NULL) {
 635                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect");
 636                 GOTO(out, rc = -EINVAL);
 637         }
 638
 639         obd_str2uuid (&cluuid, str);
 640
 641         /* XXX extract a nettype and format accordingly */
 642         switch (sizeof(lnet_nid_t)) {
 643                 /* NB the casts only avoid compiler warnings */
 644         case 8:
 645                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 646                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
 647                 break;
 648         case 4:
 649                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 650                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
 651                 break;
 652         default:
 653                 LBUG();
 654         }
 655
 656         spin_lock_bh(&target->obd_processing_task_lock);
 657         abort_recovery = target->obd_abort_recovery;
 658         spin_unlock_bh(&target->obd_processing_task_lock);
 659         if (abort_recovery)
 660                 target_abort_recovery(target);
 661
 662         tmp = lustre_msg_buf(req->rq_reqmsg, REQ_REC_OFF + 2, sizeof conn);
 663         if (tmp == NULL)
 664                 GOTO(out, rc = -EPROTO);
 665
 666         memcpy(&conn, tmp, sizeof conn);
 667
 668         data = lustre_swab_reqbuf(req, REQ_REC_OFF + 3, sizeof(*data),
 669                                   lustre_swab_connect);
 670         rc = lustre_pack_reply(req, 2, size, NULL);
 671         if (rc)
 672                 GOTO(out, rc);
 673
 674         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 675                 if (!data) {
 676                         DEBUG_REQ(D_WARNING, req, "Refusing old (unversioned) "
 677                                   "libclient connection attempt");
 678                         GOTO(out, rc = -EPROTO);
 679                 } else if (data->ocd_version < LUSTRE_VERSION_CODE -
 680                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
 681                            data->ocd_version > LUSTRE_VERSION_CODE +
 682                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
 683                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
 684                                   "libclient connection attempt",
 685                                   data->ocd_version < LUSTRE_VERSION_CODE ?
 686                                   "old" : "new",
 687                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
 688                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
 689                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
 690                                   OBD_OCD_VERSION_FIX(data->ocd_version));
 691                         data = lustre_msg_buf(req->rq_repmsg, REPLY_REC_OFF,
 692                                               offsetof(typeof(*data),
 693                                                        ocd_version) +
 694                                               sizeof(data->ocd_version));
 695                         if (data) {
 696                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
 697                                 data->ocd_version = LUSTRE_VERSION_CODE;
 698                         }
 699                         GOTO(out, rc = -EPROTO);
 700                 }
 701         }
 702
 703         /* lctl gets a backstage, all-access pass. */
 704         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 705                 goto dont_check_exports;
 706
 707         spin_lock(&target->obd_dev_lock);
 708         export = lustre_hash_get_object_by_key(target->obd_uuid_hash_body, &cluuid);
 709
 710         if (export != NULL && export->exp_connecting) { /* bug 9635, et. al. */
 711                 CWARN("%s: exp %p already connecting\n",
 712                       export->exp_obd->obd_name, export);
 713                 class_export_put(export);
 714                 export = NULL;
 715                 rc = -EALREADY;
 716         } else if (export != NULL && export->exp_connection != NULL &&
 717                    req->rq_peer.nid != export->exp_connection->c_peer.nid) {
 718                 /* make darn sure this is coming from the same peer
 719                  * if the UUIDs matched */
 720                   CWARN("%s: cookie %s seen on new NID %s when "
 721                           "existing NID %s is already connected\n",
 722                         target->obd_name, cluuid.uuid,
 723                   libcfs_nid2str(req->rq_peer.nid),
 724                   libcfs_nid2str(export->exp_connection->c_peer.nid));
 725                   class_export_put(export);
 726                   export = NULL;
 727                   rc = -EALREADY;
 728         } else if (export != NULL && export->exp_failed) { /* bug 11327 */
 729                 CDEBUG(D_HA, "%s: exp %p evict in progress - new cookie needed "
 730                       "for connect\n", export->exp_obd->obd_name, export);
 731                 class_export_put(export);
 732                 export = NULL;
 733                 rc = -ENODEV;
 734         } else if (export != NULL) {
 735                 spin_lock(&export->exp_lock);
 736                 export->exp_connecting = 1;
 737                 spin_unlock(&export->exp_lock);
 738                 class_export_put(export);
 739                 spin_unlock(&target->obd_dev_lock);
 740                 LASSERT(export->exp_obd == target);
 741
 742                 rc = target_handle_reconnect(&conn, export, &cluuid);
 743         }
 744
 745         /* If we found an export, we already unlocked. */
 746         if (!export) {
 747                 spin_unlock(&target->obd_dev_lock);
 748                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
 749         } else if (req->rq_export == NULL &&
 750                    atomic_read(&export->exp_rpc_count) > 0) {
 751                 CWARN("%s: refuse connection from %s/%s to 0x%p; still busy "
 752                       "with %d references\n", target->obd_name, cluuid.uuid,
 753                       libcfs_nid2str(req->rq_peer.nid),
 754                       export, atomic_read(&export->exp_refcount));
 755                 GOTO(out, rc = -EBUSY);
 756         } else if (req->rq_export != NULL &&
 757                    atomic_read(&export->exp_rpc_count) > 1) {
 758                 CWARN("%s: refuse reconnection from %s@%s to 0x%p; still busy "
 759                       "with %d active RPCs\n", target->obd_name, cluuid.uuid,
 760                       libcfs_nid2str(req->rq_peer.nid),
 761                       export, atomic_read(&export->exp_rpc_count));
 762                 GOTO(out, rc = -EBUSY);
 763         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
 764                 CERROR("%s: NID %s (%s) reconnected with 1 conn_cnt; "
 765                        "cookies not random?\n", target->obd_name,
 766                        libcfs_nid2str(req->rq_peer.nid), cluuid.uuid);
 767                 GOTO(out, rc = -EALREADY);
 768         } else {
 769                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
 770         }
 771
 772         if (rc < 0)
 773                 GOTO(out, rc);
 774
 775         /* Tell the client if we're in recovery. */
 776         if (target->obd_recovering) {
 777                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 778                 /* If this is the first time a client connects,
 779                    reset the recovery timer */
 780                 if (rc == 0)
 781                         target_start_and_reset_recovery_timer(target, handler,
 782                                                               req, !export);
 783         }
 784
 785         /* We want to handle EALREADY but *not* -EALREADY from
 786          * target_handle_reconnect(), return reconnection state in a flag */
 787         if (rc == EALREADY) {
 788                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 789                 rc = 0;
 790         } else {
 791                 LASSERT(rc == 0);
 792         }
 793
 794         /* Tell the client if we support replayable requests */
 795         if (target->obd_replayable)
 796                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 797         client_nid = &req->rq_peer.nid;
 798
 799         if (export == NULL) {
 800                 if (target->obd_recovering) {
 801                         CERROR("%s: denying connection for new client %s (%s): "
 802                                "%d clients in recovery for %lds\n",
 803                                target->obd_name,
 804                                libcfs_nid2str(req->rq_peer.nid), cluuid.uuid,
 805                                target->obd_recoverable_clients,
 806                                cfs_duration_sec(cfs_time_sub(cfs_timer_deadline(&target->obd_recovery_timer),
 807                                                              cfs_time_current())));
 808                         rc = -EBUSY;
 809                 } else {
 810  dont_check_exports:
 811                         rc = obd_connect(&conn, target, &cluuid, data,
 812                                          client_nid);
 813                 }
 814         } else {
 815                 rc = obd_reconnect(export, target, &cluuid, data);
 816         }
 817
 818         if (rc)
 819                 GOTO(out, rc);
 820
 821         /* Return only the parts of obd_connect_data that we understand, so the
 822          * client knows that we don't understand the rest. */
 823         if (data)
 824                 memcpy(lustre_msg_buf(req->rq_repmsg, REPLY_REC_OFF,
 825                                       sizeof(*data)),
 826                        data, sizeof(*data));
 827
 828         /* If all else goes well, this is our RPC return code. */
 829         req->rq_status = 0;
 830
 831         lustre_msg_set_handle(req->rq_repmsg, &conn);
 832
 833         /* ownership of this export ref transfers to the request AFTER we
 834          * drop any previous reference the request had, but we don't want
 835          * that to go to zero before we get our new export reference. */
 836         export = class_conn2export(&conn);
 837         if (!export) {
 838                 DEBUG_REQ(D_ERROR, req, "Missing export!");
 839                 GOTO(out, rc = -ENODEV);
 840         }
 841
 842         /* If the client and the server are the same node, we will already
 843          * have an export that really points to the client's DLM export,
 844          * because we have a shared handles table.
 845          *
 846          * XXX this will go away when shaver stops sending the "connect" handle
 847          * in the real "remote handle" field of the request --phik 24 Apr 2003
 848          */
 849         if (req->rq_export != NULL)
 850                 class_export_put(req->rq_export);
 851
 852         req->rq_export = export;
 853
 854         spin_lock(&export->exp_lock);
 855         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
 856                 CERROR("%s: %s already connected at higher conn_cnt: %d > %d\n",
 857                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 858                        export->exp_conn_cnt,
 859                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
 860
 861                 spin_unlock(&export->exp_lock);
 862                 GOTO(out, rc = -EALREADY);
 863         }
 864         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
 865
 866         /* request from liblustre?  Don't evict it for not pinging. */
 867         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 868                 export->exp_libclient = 1;
 869                 spin_unlock(&export->exp_lock);
 870
 871                 spin_lock(&target->obd_dev_lock);
 872                 list_del_init(&export->exp_obd_chain_timed);
 873                 spin_unlock(&target->obd_dev_lock);
 874         } else {
 875                 spin_unlock(&export->exp_lock);
 876         }
 877
 878         if (export->exp_connection != NULL)
 879                 ptlrpc_put_connection(export->exp_connection);
 880         export->exp_connection = ptlrpc_get_connection(req->rq_peer,
 881                                                        req->rq_self,
 882                                                        &remote_uuid);
 883
 884         spin_lock(&target->obd_dev_lock);
 885         /* Export might be hashed already, e.g. if this is reconnect */
 886         if (hlist_unhashed(&export->exp_nid_hash))
 887                 lustre_hash_additem(export->exp_obd->obd_nid_hash_body,
 888                                     &export->exp_connection->c_peer.nid,
 889                                     &export->exp_nid_hash);
 890         spin_unlock(&target->obd_dev_lock);
 891
 892         if (lustre_msg_get_op_flags(req->rq_repmsg) & MSG_CONNECT_RECONNECT) {
 893                 revimp = class_import_get(export->exp_imp_reverse);
 894                 GOTO(set_flags, rc = 0);
 895         }
 896
 897         if (target->obd_recovering)
 898                 target->obd_connected_clients++;
 899
 900         memcpy(&conn,
 901                lustre_msg_buf(req->rq_reqmsg, REQ_REC_OFF + 2, sizeof conn),
 902                sizeof conn);
 903
 904         if (export->exp_imp_reverse != NULL)
 905                 class_destroy_import(export->exp_imp_reverse);
 906         revimp = export->exp_imp_reverse = class_new_import(target);
 907         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
 908         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
 909         revimp->imp_remote_handle = conn;
 910         revimp->imp_dlm_fake = 1;
 911         revimp->imp_state = LUSTRE_IMP_FULL;
 912
 913 set_flags:
 914         if (req->rq_reqmsg->lm_magic == LUSTRE_MSG_MAGIC_V1 &&
 915             lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_NEXT_VER) {
 916                 revimp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2;
 917                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_NEXT_VER);
 918         } else {
 919                 /* unknown versions will be caught in
 920                  * ptlrpc_handle_server_req_in->lustre_unpack_msg() */
 921                 revimp->imp_msg_magic = req->rq_reqmsg->lm_magic;
 922         }
 923
 924         if (revimp->imp_msg_magic != LUSTRE_MSG_MAGIC_V1) {
 925                 if (export->exp_connect_flags & OBD_CONNECT_AT)
 926                         revimp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
 927                 else
 928                         revimp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
 929         }
 930
 931         class_import_put(revimp);
 932 out:
 933         if (export) {
 934                 spin_lock(&export->exp_lock);
 935                 export->exp_connecting = 0;
 936                 spin_unlock(&export->exp_lock);
 937         }
 938         if (targref)
 939                 class_decref(targref);
 940         if (rc)
 941                 req->rq_status = rc;
 942         RETURN(rc);
 943 }
 944
 945 int target_handle_disconnect(struct ptlrpc_request *req)
 946 {
 947         int rc;
 948         ENTRY;
 949
 950         rc = lustre_pack_reply(req, 1, NULL, NULL);
 951         if (rc)
 952                 RETURN(rc);
 953
 954         /* keep the rq_export around so we can send the reply */
 955         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
 956         RETURN(0);
 957 }
 958
 959 void target_destroy_export(struct obd_export *exp)
 960 {
 961         /* exports created from last_rcvd data, and "fake"
 962            exports created by lctl don't have an import */
 963         if (exp->exp_imp_reverse != NULL)
 964                 class_destroy_import(exp->exp_imp_reverse);
 965
 966         /* We cancel locks at disconnect time, but this will catch any locks
 967          * granted in a race with recovery-induced disconnect. */
 968         if (exp->exp_obd->obd_namespace != NULL)
 969                 ldlm_cancel_locks_for_export(exp);
 970 }
 971
 972 /*
 973  * Recovery functions
 974  */
 975
 976 static int target_exp_enqueue_req_replay(struct ptlrpc_request *req)
 977 {
 978         __u64                  transno = lustre_msg_get_transno(req->rq_reqmsg);
 979         struct obd_export     *exp = req->rq_export;
 980         struct ptlrpc_request *reqiter;
 981         int                    dup = 0;
 982
 983         LASSERT(exp);
 984
 985         spin_lock(&exp->exp_lock);
 986         list_for_each_entry(reqiter, &exp->exp_req_replay_queue,
 987                             rq_replay_list) {
 988                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) == transno) {
 989                         dup = 1;
 990                         break;
 991                 }
 992         }
 993
 994         if (dup) {
 995                 /* we expect it with RESENT and REPLAY flags */
 996                 if ((lustre_msg_get_flags(req->rq_reqmsg) &
 997                      (MSG_RESENT | MSG_REPLAY)) != (MSG_RESENT | MSG_REPLAY))
 998                         CERROR("invalid flags %x of resent replay\n",
 999                                lustre_msg_get_flags(req->rq_reqmsg));
1000         } else {
1001                 list_add_tail(&req->rq_replay_list, &exp->exp_req_replay_queue);
1002         }
1003
1004         spin_unlock(&exp->exp_lock);
1005         return dup;
1006 }
1007
1008 static void target_exp_dequeue_req_replay(struct ptlrpc_request *req)
1009 {
1010         LASSERT(!list_empty(&req->rq_replay_list));
1011         LASSERT(req->rq_export);
1012
1013         spin_lock(&req->rq_export->exp_lock);
1014         list_del_init(&req->rq_replay_list);
1015         spin_unlock(&req->rq_export->exp_lock);
1016 }
1017
1018 static void target_release_saved_req(struct ptlrpc_request *req)
1019 {
1020         ptlrpc_req_drop_rs(req);
1021         class_export_put(req->rq_export);
1022         OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
1023         OBD_FREE(req, sizeof *req);
1024 }
1025
1026 static void target_finish_recovery(struct obd_device *obd)
1027 {
1028         struct list_head *tmp, *n;
1029
1030         LCONSOLE_INFO("%s: sending delayed replies to recovered clients\n",
1031                       obd->obd_name);
1032
1033         ldlm_reprocess_all_ns(obd->obd_namespace);
1034
1035         /* when recovery finished, cleanup orphans on mds and ost */
1036         if (OBT(obd) && OBP(obd, postrecov)) {
1037                 int rc = OBP(obd, postrecov)(obd);
1038                 LCONSOLE_WARN("%s: recovery %s: rc %d\n", obd->obd_name,
1039                               rc < 0 ? "failed" : "complete", rc);
1040         }
1041
1042         list_for_each_safe(tmp, n, &obd->obd_delayed_reply_queue) {
1043                 struct ptlrpc_request *req;
1044                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
1045                 list_del(&req->rq_list);
1046                 DEBUG_REQ(D_HA, req, "delayed:");
1047                 ptlrpc_reply(req);
1048                 target_release_saved_req(req);
1049         }
1050         obd->obd_recovery_end = cfs_time_current_sec();
1051 }
1052
1053 static void abort_recovery_queue(struct obd_device *obd)
1054 {
1055         struct ptlrpc_request *req;
1056         struct list_head *tmp, *n;
1057         int rc;
1058
1059         list_for_each_safe(tmp, n, &obd->obd_recovery_queue) {
1060                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
1061                 target_exp_dequeue_req_replay(req);
1062                 list_del(&req->rq_list);
1063                 DEBUG_REQ(D_ERROR, req, "aborted:");
1064                 req->rq_status = -ENOTCONN;
1065                 req->rq_type = PTL_RPC_MSG_ERR;
1066                 rc = lustre_pack_reply(req, 1, NULL, NULL);
1067                 if (rc == 0)
1068                         ptlrpc_reply(req);
1069                 else
1070                         DEBUG_REQ(D_ERROR, req,
1071                                   "packing failed for abort-reply; skipping");
1072                 target_release_saved_req(req);
1073         }
1074 }
1075
1076 /* Called from a cleanup function if the device is being cleaned up
1077    forcefully.  The exports should all have been disconnected already,
1078    the only thing left to do is
1079      - clear the recovery flags
1080      - cancel the timer
1081      - free queued requests and replies, but don't send replies
1082    Because the obd_stopping flag is set, no new requests should be received.
1083
1084 */
1085 void target_cleanup_recovery(struct obd_device *obd)
1086 {
1087         struct list_head *tmp, *n;
1088         struct ptlrpc_request *req;
1089         ENTRY;
1090
1091         LASSERT(obd->obd_stopping);
1092
1093         spin_lock_bh(&obd->obd_processing_task_lock);
1094         if (!obd->obd_recovering) {
1095                 spin_unlock_bh(&obd->obd_processing_task_lock);
1096                 EXIT;
1097                 return;
1098         }
1099         obd->obd_recovering = obd->obd_abort_recovery = 0;
1100         target_cancel_recovery_timer(obd);
1101         spin_unlock_bh(&obd->obd_processing_task_lock);
1102
1103         list_for_each_safe(tmp, n, &obd->obd_delayed_reply_queue) {
1104                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
1105                 list_del(&req->rq_list);
1106                 target_release_saved_req(req);
1107         }
1108
1109         list_for_each_safe(tmp, n, &obd->obd_recovery_queue) {
1110                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
1111                 target_exp_dequeue_req_replay(req);
1112                 list_del(&req->rq_list);
1113                 target_release_saved_req(req);
1114         }
1115         EXIT;
1116 }
1117
1118 void target_abort_recovery(void *data)
1119 {
1120         struct obd_device *obd = data;
1121         ENTRY;
1122
1123         spin_lock_bh(&obd->obd_processing_task_lock);
1124         if (!obd->obd_recovering) {
1125                 spin_unlock_bh(&obd->obd_processing_task_lock);
1126                 EXIT;
1127                 return;
1128         }
1129         obd->obd_recovering = obd->obd_abort_recovery = 0;
1130         target_cancel_recovery_timer(obd);
1131         spin_unlock_bh(&obd->obd_processing_task_lock);
1132
1133         LCONSOLE_WARN("%s: recovery period over; %d clients never reconnected "
1134                       "after %lds (%d clients did)\n",
1135                       obd->obd_name, obd->obd_recoverable_clients,
1136                       cfs_time_current_sec()- obd->obd_recovery_start,
1137                       obd->obd_connected_clients);
1138         class_disconnect_stale_exports(obd);
1139         abort_recovery_queue(obd);
1140
1141         target_finish_recovery(obd);
1142         CDEBUG(D_HA, "%s: recovery complete\n", obd_uuid2str(&obd->obd_uuid));
1143         EXIT;
1144 }
1145
1146 static void target_recovery_expired(unsigned long castmeharder)
1147 {
1148         struct obd_device *obd = (struct obd_device *)castmeharder;
1149         CERROR("%s: recovery timed out, aborting\n", obd->obd_name);
1150         spin_lock_bh(&obd->obd_processing_task_lock);
1151         if (obd->obd_recovering)
1152                 obd->obd_abort_recovery = 1;
1153         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1154         spin_unlock_bh(&obd->obd_processing_task_lock);
1155 }
1156
1157
1158 /* obd_processing_task_lock should be held */
1159 void target_cancel_recovery_timer(struct obd_device *obd)
1160 {
1161         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1162         cfs_timer_disarm(&obd->obd_recovery_timer);
1163 }
1164
1165 /* extend = 1 means require at least "duration" seconds left in the timer,
1166    extend = 0 means set the total duration (start_recovery_timer) */
1167 static void reset_recovery_timer(struct obd_device *obd, int duration,
1168                                  int extend)
1169 {
1170         cfs_time_t now = cfs_time_current_sec();
1171         cfs_duration_t left;
1172
1173         spin_lock_bh(&obd->obd_processing_task_lock);
1174         if (!obd->obd_recovering) {
1175                 spin_unlock_bh(&obd->obd_processing_task_lock);
1176                 return;
1177         }
1178
1179         left = cfs_time_sub(obd->obd_recovery_end, now);
1180
1181         if (extend && (duration > left))
1182                 obd->obd_recovery_timeout += duration - left;
1183         else if (!extend && (duration > obd->obd_recovery_timeout))
1184                 /* Track the client's largest expected replay time */
1185                 obd->obd_recovery_timeout = duration;
1186 #ifdef CRAY_XT3
1187         /*
1188          * If total recovery time already exceed the
1189          * obd_recovery_max_time, then CRAY XT3 will
1190          * abort the recovery
1191          */
1192         if(obd->obd_recovery_timeout > obd->obd_recovery_max_time)
1193                 obd->obd_recovery_timeout = obd->obd_recovery_max_time;
1194 #endif
1195         obd->obd_recovery_end = obd->obd_recovery_start +
1196                                 obd->obd_recovery_timeout;
1197         if (cfs_time_before(now, obd->obd_recovery_end)) {
1198                 left = cfs_time_sub(obd->obd_recovery_end, now);
1199                 cfs_timer_arm(&obd->obd_recovery_timer, cfs_time_shift(left));
1200         }
1201         spin_unlock_bh(&obd->obd_processing_task_lock);
1202         CDEBUG(D_HA, "%s: recovery timer will expire in %u seconds\n",
1203                obd->obd_name, (unsigned)left);
1204 }
1205
1206 static void check_and_start_recovery_timer(struct obd_device *obd,
1207                                            svc_handler_t handler)
1208 {
1209         spin_lock_bh(&obd->obd_processing_task_lock);
1210         if (obd->obd_recovery_handler) {
1211                 spin_unlock_bh(&obd->obd_processing_task_lock);
1212                 return;
1213         }
1214         CWARN("%s: starting recovery timer\n", obd->obd_name);
1215         obd->obd_recovery_start = cfs_time_current_sec();
1216         /* minimum */
1217         obd->obd_recovery_timeout = OBD_RECOVERY_FACTOR * obd_timeout;
1218         obd->obd_recovery_handler = handler;
1219         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
1220         spin_unlock_bh(&obd->obd_processing_task_lock);
1221
1222         reset_recovery_timer(obd, obd->obd_recovery_timeout, 0);
1223 }
1224
1225 /* Reset the timer with each new client connection */
1226 /*
1227  * This timer is actually reconnect_timer, which is for making sure
1228  * the total recovery window is at least as big as my reconnect
1229  * attempt timing. So the initial recovery time_out will be set to
1230  * OBD_RECOVERY_FACTOR * obd_timeout. If the timeout coming
1231  * from client is bigger than this, then the recovery time_out will
1232  * be extend to make sure the client could be reconnected, in the
1233  * process, the timeout from the new client should be ignored.
1234  */
1235
1236 static void
1237 target_start_and_reset_recovery_timer(struct obd_device *obd,
1238                                       svc_handler_t handler,
1239                                       struct ptlrpc_request *req,
1240                                       int new_client)
1241 {
1242         int req_timeout = OBD_RECOVERY_FACTOR *
1243                           lustre_msg_get_timeout(req->rq_reqmsg);
1244
1245         check_and_start_recovery_timer(obd, handler);
1246
1247         if (req_timeout > obd->obd_recovery_timeout && !new_client)
1248                 reset_recovery_timer(obd, req_timeout, 0);
1249 }
1250
1251 static int check_for_next_transno(struct obd_device *obd)
1252 {
1253         struct ptlrpc_request *req;
1254         int wake_up = 0, connected, completed, queue_len, max;
1255         __u64 next_transno, req_transno;
1256
1257         spin_lock_bh(&obd->obd_processing_task_lock);
1258         req = list_entry(obd->obd_recovery_queue.next,
1259                          struct ptlrpc_request, rq_list);
1260         max = obd->obd_max_recoverable_clients;
1261         req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1262         connected = obd->obd_connected_clients;
1263         completed = max - obd->obd_recoverable_clients;
1264         queue_len = obd->obd_requests_queued_for_recovery;
1265         next_transno = obd->obd_next_recovery_transno;
1266
1267         CDEBUG(D_HA,"max: %d, connected: %d, completed: %d, queue_len: %d, "
1268                "req_transno: "LPU64", next_transno: "LPU64"\n",
1269                max, connected, completed, queue_len, req_transno, next_transno);
1270         if (obd->obd_abort_recovery) {
1271                 CDEBUG(D_HA, "waking for aborted recovery\n");
1272                 wake_up = 1;
1273         } else if (!obd->obd_recovering) {
1274                 CDEBUG(D_HA, "waking for completed recovery (?)\n");
1275                 wake_up = 1;
1276         } else if (req_transno == next_transno) {
1277                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1278                 wake_up = 1;
1279         } else if (queue_len + completed == max) {
1280                 CDEBUG(D_ERROR,
1281                        "waking for skipped transno (skip: "LPD64
1282                        ", ql: %d, comp: %d, conn: %d, next: "LPD64")\n",
1283                        next_transno, queue_len, completed, max, req_transno);
1284                 obd->obd_next_recovery_transno = req_transno;
1285                 wake_up = 1;
1286         }
1287         spin_unlock_bh(&obd->obd_processing_task_lock);
1288         LASSERT(lustre_msg_get_transno(req->rq_reqmsg) >= next_transno);
1289         return wake_up;
1290 }
1291
1292 static void process_recovery_queue(struct obd_device *obd)
1293 {
1294         struct ptlrpc_request *req;
1295         int abort_recovery = 0;
1296         struct l_wait_info lwi = { 0 };
1297         ENTRY;
1298
1299         for (;;) {
1300                 spin_lock_bh(&obd->obd_processing_task_lock);
1301                 LASSERT(obd->obd_processing_task == cfs_curproc_pid());
1302                 req = list_entry(obd->obd_recovery_queue.next,
1303                                  struct ptlrpc_request, rq_list);
1304
1305                 if (lustre_msg_get_transno(req->rq_reqmsg) !=
1306                     obd->obd_next_recovery_transno) {
1307                         spin_unlock_bh(&obd->obd_processing_task_lock);
1308                         CDEBUG(D_HA, "Waiting for transno "LPD64" (1st is "
1309                                LPD64", x"LPU64")\n",
1310                                obd->obd_next_recovery_transno,
1311                                lustre_msg_get_transno(req->rq_reqmsg),
1312                                req->rq_xid);
1313                         l_wait_event(obd->obd_next_transno_waitq,
1314                                      check_for_next_transno(obd), &lwi);
1315                         spin_lock_bh(&obd->obd_processing_task_lock);
1316                         abort_recovery = obd->obd_abort_recovery;
1317                         spin_unlock_bh(&obd->obd_processing_task_lock);
1318                         if (abort_recovery) {
1319                                 target_abort_recovery(obd);
1320                                 return;
1321                         }
1322                         continue;
1323                 }
1324                 target_exp_dequeue_req_replay(req);
1325                 list_del_init(&req->rq_list);
1326                 obd->obd_requests_queued_for_recovery--;
1327                 spin_unlock_bh(&obd->obd_processing_task_lock);
1328
1329                 DEBUG_REQ(D_HA, req, "processing: ");
1330                 (void)obd->obd_recovery_handler(req);
1331                 obd->obd_replayed_requests++;
1332                 reset_recovery_timer(obd, OBD_RECOVERY_FACTOR *
1333                        AT_OFF ? obd_timeout :
1334                        at_get(&req->rq_rqbd->rqbd_service->srv_at_estimate), 1);
1335                 /* bug 1580: decide how to properly sync() in recovery */
1336                 //mds_fsync_super(obd->u.obt.obt_sb);
1337                 class_export_put(req->rq_export);
1338                 ptlrpc_req_drop_rs(req);
1339                 OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
1340                 OBD_FREE(req, sizeof *req);
1341                 spin_lock_bh(&obd->obd_processing_task_lock);
1342                 obd->obd_next_recovery_transno++;
1343                 if (list_empty(&obd->obd_recovery_queue)) {
1344                         obd->obd_processing_task = 0;
1345                         spin_unlock_bh(&obd->obd_processing_task_lock);
1346                         break;
1347                 }
1348                 spin_unlock_bh(&obd->obd_processing_task_lock);
1349         }
1350         EXIT;
1351 }
1352
1353 int target_queue_recovery_request(struct ptlrpc_request *req,
1354                                   struct obd_device *obd)
1355 {
1356         struct list_head *tmp;
1357         int inserted = 0;
1358         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1359         struct ptlrpc_request *saved_req;
1360         struct lustre_msg *reqmsg;
1361         int rc = 0;
1362
1363         /* CAVEAT EMPTOR: The incoming request message has been swabbed
1364          * (i.e. buflens etc are in my own byte order), but type-dependent
1365          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
1366
1367         if (!transno) {
1368                 CFS_INIT_LIST_HEAD(&req->rq_list);
1369                 DEBUG_REQ(D_HA, req, "not queueing");
1370                 return 1;
1371         }
1372
1373         /* XXX If I were a real man, these LBUGs would be sane cleanups. */
1374         /* XXX just like the request-dup code in queue_final_reply */
1375         OBD_ALLOC(saved_req, sizeof *saved_req);
1376         if (!saved_req)
1377                 LBUG();
1378         OBD_ALLOC(reqmsg, req->rq_reqlen);
1379         if (!reqmsg)
1380                 LBUG();
1381
1382         spin_lock_bh(&obd->obd_processing_task_lock);
1383
1384         /* If we're processing the queue, we want don't want to queue this
1385          * message.
1386          *
1387          * Also, if this request has a transno less than the one we're waiting
1388          * for, we should process it now.  It could (and currently always will)
1389          * be an open request for a descriptor that was opened some time ago.
1390          *
1391          * Also, a resent, replayed request that has already been
1392          * handled will pass through here and be processed immediately.
1393          */
1394         if (obd->obd_processing_task == cfs_curproc_pid() ||
1395             transno < obd->obd_next_recovery_transno) {
1396                 /* Processing the queue right now, don't re-add. */
1397                 LASSERT(list_empty(&req->rq_list));
1398                 spin_unlock_bh(&obd->obd_processing_task_lock);
1399                 GOTO(err_free, rc = 1);
1400         }
1401
1402         if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_TGT_REPLAY_DROP))) {
1403                 spin_unlock_bh(&obd->obd_processing_task_lock);
1404                 GOTO(err_free, rc = 0);
1405         }
1406
1407         memcpy(saved_req, req, sizeof *req);
1408         memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1409         req = saved_req;
1410         req->rq_reqmsg = reqmsg;
1411         class_export_get(req->rq_export);
1412         CFS_INIT_LIST_HEAD(&req->rq_list);
1413         CFS_INIT_LIST_HEAD(&req->rq_replay_list);
1414
1415         if (target_exp_enqueue_req_replay(req)) {
1416                 spin_unlock_bh(&obd->obd_processing_task_lock);
1417                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
1418                 GOTO(err_exp, rc = 0);
1419         }
1420
1421         /* XXX O(n^2) */
1422         list_for_each(tmp, &obd->obd_recovery_queue) {
1423                 struct ptlrpc_request *reqiter =
1424                         list_entry(tmp, struct ptlrpc_request, rq_list);
1425
1426                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
1427                         list_add_tail(&req->rq_list, &reqiter->rq_list);
1428                         inserted = 1;
1429                         break;
1430                 }
1431
1432                 if (unlikely(lustre_msg_get_transno(reqiter->rq_reqmsg) ==
1433                              transno)) {
1434                         spin_unlock_bh(&obd->obd_processing_task_lock);
1435                         DEBUG_REQ(D_ERROR, req, "dropping replay: transno "
1436                                   "has been claimed by another client");
1437                         target_exp_dequeue_req_replay(req);
1438                         GOTO(err_exp, rc = 0);
1439                 }
1440         }
1441
1442         if (!inserted) {
1443                 list_add_tail(&req->rq_list, &obd->obd_recovery_queue);
1444         }
1445
1446         obd->obd_requests_queued_for_recovery++;
1447
1448         if (obd->obd_processing_task != 0) {
1449                 /* Someone else is processing this queue, we'll leave it to
1450                  * them.
1451                  */
1452                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1453                 spin_unlock_bh(&obd->obd_processing_task_lock);
1454                 return 0;
1455         }
1456
1457         /* Nobody is processing, and we know there's (at least) one to process
1458          * now, so we'll do the honours.
1459          */
1460         obd->obd_processing_task = cfs_curproc_pid();
1461         spin_unlock_bh(&obd->obd_processing_task_lock);
1462
1463         process_recovery_queue(obd);
1464         return 0;
1465
1466 err_exp:
1467         class_export_put(req->rq_export);
1468 err_free:
1469         OBD_FREE(reqmsg, req->rq_reqlen);
1470         OBD_FREE(saved_req, sizeof(*saved_req));
1471         return rc;
1472 }
1473
1474 struct obd_device * target_req2obd(struct ptlrpc_request *req)
1475 {
1476         return req->rq_export->exp_obd;
1477 }
1478
1479 int target_queue_last_replay_reply(struct ptlrpc_request *req, int rc)
1480 {
1481         struct obd_device *obd = target_req2obd(req);
1482         struct ptlrpc_request *saved_req;
1483         struct lustre_msg *reqmsg;
1484         int recovery_done = 0;
1485
1486         LASSERT ((rc == 0) == req->rq_packed_final);
1487
1488         if (!req->rq_packed_final) {
1489                 /* Just like ptlrpc_error, but without the sending. */
1490                 rc = lustre_pack_reply(req, 1, NULL, NULL);
1491                 if (rc)
1492                         return rc;
1493                 req->rq_type = PTL_RPC_MSG_ERR;
1494         }
1495
1496         LASSERT(!req->rq_reply_state->rs_difficult);
1497         LASSERT(list_empty(&req->rq_list));
1498         /* XXX a bit like the request-dup code in queue_recovery_request */
1499         OBD_ALLOC(saved_req, sizeof *saved_req);
1500         if (!saved_req)
1501                 return -ENOMEM;
1502         OBD_ALLOC(reqmsg, req->rq_reqlen);
1503         if (!reqmsg) {
1504                 OBD_FREE(saved_req, sizeof *req);
1505                 return -ENOMEM;
1506         }
1507         *saved_req = *req;
1508         memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1509
1510         /* Don't race cleanup */
1511         spin_lock_bh(&obd->obd_processing_task_lock);
1512         if (obd->obd_stopping) {
1513                 spin_unlock_bh(&obd->obd_processing_task_lock);
1514                 OBD_FREE(reqmsg, req->rq_reqlen);
1515                 OBD_FREE(saved_req, sizeof *req);
1516                 req->rq_status = -ENOTCONN;
1517                 /* rv is ignored anyhow */
1518                 return -ENOTCONN;
1519         }
1520         ptlrpc_rs_addref(req->rq_reply_state);  /* +1 ref for saved reply */
1521         req = saved_req;
1522         req->rq_reqmsg = reqmsg;
1523         class_export_get(req->rq_export);
1524         list_add(&req->rq_list, &obd->obd_delayed_reply_queue);
1525
1526         /* only count the first "replay over" request from each
1527            export */
1528         if (req->rq_export->exp_replay_needed) {
1529                 --obd->obd_recoverable_clients;
1530
1531                 spin_lock(&req->rq_export->exp_lock);
1532                 req->rq_export->exp_replay_needed = 0;
1533                 spin_unlock(&req->rq_export->exp_lock);
1534         }
1535         recovery_done = (obd->obd_recoverable_clients == 0);
1536         spin_unlock_bh(&obd->obd_processing_task_lock);
1537
1538         OBD_RACE(OBD_FAIL_LDLM_RECOV_CLIENTS);
1539         if (recovery_done) {
1540                 spin_lock_bh(&obd->obd_processing_task_lock);
1541                 obd->obd_recovering = obd->obd_abort_recovery = 0;
1542                 target_cancel_recovery_timer(obd);
1543                 spin_unlock_bh(&obd->obd_processing_task_lock);
1544
1545                 target_finish_recovery(obd);
1546                 CDEBUG(D_HA, "%s: recovery complete\n",
1547                        obd_uuid2str(&obd->obd_uuid));
1548         } else {
1549                 CWARN("%s: %d recoverable clients remain\n",
1550                        obd->obd_name, obd->obd_recoverable_clients);
1551                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1552         }
1553
1554         return 1;
1555 }
1556
1557 static inline struct ldlm_pool *ldlm_exp2pl(struct obd_export *exp)
1558 {
1559         LASSERT(exp != NULL);
1560         return &exp->exp_obd->obd_namespace->ns_pool;
1561 }
1562
1563 int target_pack_pool_reply(struct ptlrpc_request *req)
1564 {
1565         struct obd_device *obd;
1566         ENTRY;
1567
1568         /*
1569          * Check that we still have all structures alive as this may
1570          * be some late rpc in shutdown time.
1571          */
1572         if (unlikely(!req->rq_export || !req->rq_export->exp_obd ||
1573                      !exp_connect_lru_resize(req->rq_export))) {
1574                 lustre_msg_set_slv(req->rq_repmsg, 0);
1575                 lustre_msg_set_limit(req->rq_repmsg, 0);
1576                 RETURN(0);
1577         }
1578
1579         /*
1580          * OBD is alive here as export is alive, which we checked above.
1581          */
1582         obd = req->rq_export->exp_obd;
1583
1584         read_lock(&obd->obd_pool_lock);
1585         lustre_msg_set_slv(req->rq_repmsg, obd->obd_pool_slv);
1586         lustre_msg_set_limit(req->rq_repmsg, obd->obd_pool_limit);
1587         read_unlock(&obd->obd_pool_lock);
1588
1589         RETURN(0);
1590 }
1591
1592 int
1593 target_send_reply_msg (struct ptlrpc_request *req, int rc, int fail_id)
1594 {
1595         if (OBD_FAIL_CHECK(fail_id | OBD_FAIL_ONCE)) {
1596                 obd_fail_loc |= OBD_FAIL_ONCE | OBD_FAILED;
1597                 DEBUG_REQ(D_ERROR, req, "dropping reply");
1598                 return (-ECOMM);
1599         }
1600
1601         if (rc) {
1602                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
1603                 req->rq_status = rc;
1604                 return (ptlrpc_send_error(req, 1));
1605         } else {
1606                 DEBUG_REQ(D_NET, req, "sending reply");
1607         }
1608
1609         return (ptlrpc_send_reply(req, PTLRPC_REPLY_MAYBE_DIFFICULT));
1610 }
1611
1612 void
1613 target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
1614 {
1615         int                        netrc;
1616         struct ptlrpc_reply_state *rs;
1617         struct obd_device         *obd;
1618         struct obd_export         *exp;
1619         struct ptlrpc_service     *svc;
1620
1621         svc = req->rq_rqbd->rqbd_service;
1622         rs = req->rq_reply_state;
1623         if (rs == NULL || !rs->rs_difficult) {
1624                 /* no notifiers */
1625                 target_send_reply_msg (req, rc, fail_id);
1626                 return;
1627         }
1628
1629         /* must be an export if locks saved */
1630         LASSERT (req->rq_export != NULL);
1631         /* req/reply consistent */
1632         LASSERT (rs->rs_service == svc);
1633
1634         /* "fresh" reply */
1635         LASSERT (!rs->rs_scheduled);
1636         LASSERT (!rs->rs_scheduled_ever);
1637         LASSERT (!rs->rs_handled);
1638         LASSERT (!rs->rs_on_net);
1639         LASSERT (rs->rs_export == NULL);
1640         LASSERT (list_empty(&rs->rs_obd_list));
1641         LASSERT (list_empty(&rs->rs_exp_list));
1642
1643         exp = class_export_get (req->rq_export);
1644         obd = exp->exp_obd;
1645
1646         /* disable reply scheduling onto srv_reply_queue while I'm setting up */
1647         rs->rs_scheduled = 1;
1648         rs->rs_on_net    = 1;
1649         rs->rs_xid       = req->rq_xid;
1650         rs->rs_transno   = req->rq_transno;
1651         rs->rs_export    = exp;
1652
1653         spin_lock(&obd->obd_uncommitted_replies_lock);
1654
1655         if (rs->rs_transno > obd->obd_last_committed) {
1656                 /* not committed already */
1657                 list_add_tail (&rs->rs_obd_list,
1658                                &obd->obd_uncommitted_replies);
1659         }
1660
1661         spin_unlock (&obd->obd_uncommitted_replies_lock);
1662         spin_lock (&exp->exp_lock);
1663
1664         list_add_tail (&rs->rs_exp_list, &exp->exp_outstanding_replies);
1665
1666         spin_unlock(&exp->exp_lock);
1667
1668         netrc = target_send_reply_msg (req, rc, fail_id);
1669
1670         spin_lock(&svc->srv_lock);
1671
1672         svc->srv_n_difficult_replies++;
1673
1674         if (netrc != 0) {
1675                 /* error sending: reply is off the net.  Also we need +1
1676                  * reply ref until ptlrpc_server_handle_reply() is done
1677                  * with the reply state (if the send was successful, there
1678                  * would have been +1 ref for the net, which
1679                  * reply_out_callback leaves alone) */
1680                 rs->rs_on_net = 0;
1681                 ptlrpc_rs_addref(rs);
1682                 atomic_inc (&svc->srv_outstanding_replies);
1683         }
1684
1685         if (!rs->rs_on_net ||                   /* some notifier */
1686             list_empty(&rs->rs_exp_list) ||     /* completed already */
1687             list_empty(&rs->rs_obd_list)) {
1688                 list_add_tail (&rs->rs_list, &svc->srv_reply_queue);
1689                 cfs_waitq_signal (&svc->srv_waitq);
1690         } else {
1691                 list_add (&rs->rs_list, &svc->srv_active_replies);
1692                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
1693         }
1694
1695         spin_unlock(&svc->srv_lock);
1696 }
1697
1698 int target_handle_ping(struct ptlrpc_request *req)
1699 {
1700         obd_ping(req->rq_export);
1701         return lustre_pack_reply(req, 1, NULL, NULL);
1702 }
1703
1704 void target_committed_to_req(struct ptlrpc_request *req)
1705 {
1706         struct obd_device *obd = req->rq_export->exp_obd;
1707
1708         if (!obd->obd_no_transno && req->rq_repmsg != NULL)
1709                 lustre_msg_set_last_committed(req->rq_repmsg,
1710                                               obd->obd_last_committed);
1711         else
1712                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update (%d/"
1713                           "%d)", obd->obd_no_transno, req->rq_repmsg == NULL);
1714
1715         CDEBUG(D_INFO, "last_committed x"LPU64", this req x"LPU64"\n",
1716                obd->obd_last_committed, req->rq_xid);
1717 }
1718
1719 EXPORT_SYMBOL(target_committed_to_req);
1720
1721 #ifdef HAVE_QUOTA_SUPPORT
1722 int target_handle_qc_callback(struct ptlrpc_request *req)
1723 {
1724         struct obd_quotactl *oqctl;
1725         struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
1726
1727         oqctl = lustre_swab_reqbuf(req, REQ_REC_OFF, sizeof(*oqctl),
1728                                    lustre_swab_obd_quotactl);
1729         if (oqctl == NULL) {
1730                 CERROR("Can't unpack obd_quotactl\n");
1731                 RETURN(-EPROTO);
1732         }
1733
1734         cli->cl_qchk_stat = oqctl->qc_stat;
1735
1736         return 0;
1737 }
1738
1739 int target_handle_dqacq_callback(struct ptlrpc_request *req)
1740 {
1741 #ifdef __KERNEL__
1742         struct obd_device *obd = req->rq_export->exp_obd;
1743         struct obd_device *master_obd;
1744         struct lustre_quota_ctxt *qctxt;
1745         struct qunit_data *qdata = NULL;
1746         int rc = 0;
1747         int repsize[2] = { sizeof(struct ptlrpc_body), 0 };
1748         ENTRY;
1749
1750         if (OBD_FAIL_CHECK_ONCE(OBD_FAIL_MDS_DROP_QUOTA_REQ))
1751                 RETURN(rc);
1752
1753         repsize[1] = quota_get_qunit_data_size(req->rq_export->
1754                                                exp_connect_flags);
1755
1756         rc = lustre_pack_reply(req, 2, repsize, NULL);
1757         if (rc)
1758                 RETURN(rc);
1759
1760         LASSERT(req->rq_export);
1761
1762         /* there are three forms of qunit(historic causes), so we need to
1763          * adjust qunits from slaves to the same form here */
1764         OBD_ALLOC(qdata, sizeof(struct qunit_data));
1765         if (!qdata)
1766                 RETURN(-ENOMEM);
1767         rc = quota_get_qdata(req, qdata, QUOTA_REQUEST, QUOTA_EXPORT);
1768         if (rc < 0) {
1769                 CDEBUG(D_ERROR, "Can't unpack qunit_data\n");
1770                 GOTO(out, rc = -EPROTO);
1771         }
1772
1773         /* we use the observer */
1774         LASSERT(obd->obd_observer && obd->obd_observer->obd_observer);
1775         master_obd = obd->obd_observer->obd_observer;
1776         qctxt = &master_obd->u.obt.obt_qctxt;
1777
1778         LASSERT(qctxt->lqc_handler);
1779         rc = qctxt->lqc_handler(master_obd, qdata,
1780                                 lustre_msg_get_opc(req->rq_reqmsg));
1781         if (rc && rc != -EDQUOT)
1782                 CDEBUG(rc == -EBUSY  ? D_QUOTA : D_ERROR,
1783                        "dqacq failed! (rc:%d)\n", rc);
1784         req->rq_status = rc;
1785
1786         /* there are three forms of qunit(historic causes), so we need to
1787          * adjust the same form to different forms slaves needed */
1788         rc = quota_copy_qdata(req, qdata, QUOTA_REPLY, QUOTA_EXPORT);
1789         if (rc < 0) {
1790                 CDEBUG(D_ERROR, "Can't pack qunit_data\n");
1791                 GOTO(out, rc = -EPROTO);
1792         }
1793
1794         /* Block the quota req. b=14840 */
1795         OBD_FAIL_TIMEOUT(OBD_FAIL_MDS_BLOCK_QUOTA_REQ, obd_timeout);
1796
1797         rc = ptlrpc_reply(req);
1798 out:
1799         OBD_FREE(qdata, sizeof(struct qunit_data));
1800         RETURN(rc);
1801 #else
1802         return 0;
1803 #endif /* !__KERNEL__ */
1804 }
1805 #endif /* HAVE_QUOTA_SUPPORT */
1806
1807 ldlm_mode_t lck_compat_array[] = {
1808         [LCK_EX] LCK_COMPAT_EX,
1809         [LCK_PW] LCK_COMPAT_PW,
1810         [LCK_PR] LCK_COMPAT_PR,
1811         [LCK_CW] LCK_COMPAT_CW,
1812         [LCK_CR] LCK_COMPAT_CR,
1813         [LCK_NL] LCK_COMPAT_NL,
1814         [LCK_GROUP] LCK_COMPAT_GROUP
1815 };