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 Lustre, http://www.lustre.org.
   7  *
   8  *   Lustre is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Lustre is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Lustre; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #ifndef EXPORT_SYMTAB
  23 # define EXPORT_SYMTAB
  24 #endif
  25 #define DEBUG_SUBSYSTEM S_LDLM
  26
  27 #ifdef __KERNEL__
  28 # include <linux/module.h>
  29 #else
  30 # include <liblustre.h>
  31 #endif
  32 #include <linux/obd.h>
  33 #include <linux/obd_ost.h> /* for LUSTRE_OSC_NAME */
  34 #include <linux/lustre_mds.h> /* for LUSTRE_MDC_NAME */
  35 #include <linux/lustre_mgmt.h>
  36 #include <linux/lustre_dlm.h>
  37 #include <linux/lustre_net.h>
  38 /* @priority: if non-zero, move the selected to the list head
  39  * @nocreate: if non-zero, only search in existed connections
  40  */
  41 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  42                            int priority, int nocreate)
  43 {
  44         struct ptlrpc_connection *ptlrpc_conn;
  45         struct obd_import_conn *imp_conn = NULL, *item;
  46         int rc = 0;
  47         ENTRY;
  48
  49         LASSERT(!(nocreate && !priority));
  50
  51         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
  52         if (!ptlrpc_conn) {
  53                 CERROR("can't find connection %s\n", uuid->uuid);
  54                 RETURN (-EINVAL);
  55         }
  56
  57         if (!nocreate) {
  58                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  59                 if (!imp_conn) {
  60                         CERROR("fail to alloc memory\n");
  61                         GOTO(out_put, rc = -ENOMEM);
  62                 }
  63         }
  64
  65         spin_lock(&imp->imp_lock);
  66         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  67                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  68                         if (priority) {
  69                                 list_del(&item->oic_item);
  70                                 list_add(&item->oic_item, &imp->imp_conn_list);
  71                                 item->oic_last_attempt = 0;
  72                         }
  73                         CDEBUG(D_HA, "imp %p@%s: find existed conn %s%s\n",
  74                                imp, imp->imp_obd->obd_name, uuid->uuid,
  75                                (priority ? ", move to head." : ""));
  76                         spin_unlock(&imp->imp_lock);
  77                         GOTO(out_free, rc = 0);
  78                 }
  79         }
  80         /* not found */
  81         if (!nocreate) {
  82                 imp_conn->oic_conn = ptlrpc_conn;
  83                 imp_conn->oic_uuid = *uuid;
  84                 imp_conn->oic_last_attempt = 0;
  85                 if (priority)
  86                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
  87                 else
  88                         list_add_tail(&imp_conn->oic_item, &imp->imp_conn_list);
  89                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
  90                        imp, imp->imp_obd->obd_name, uuid->uuid,
  91                        (priority ? "head" : "tail"));
  92         } else
  93                 rc = -ENOENT;
  94
  95         spin_unlock(&imp->imp_lock);
  96         RETURN(0);
  97 out_free:
  98         if (imp_conn)
  99                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 100 out_put:
 101         ptlrpc_put_connection(ptlrpc_conn);
 102         RETURN(rc);
 103 }
 104
 105 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 106 {
 107         return import_set_conn(imp, uuid, 1, 1);
 108 }
 109
 110 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 111                            int priority)
 112 {
 113         return import_set_conn(imp, uuid, priority, 0);
 114 }
 115
 116 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 117 {
 118         struct obd_import_conn *imp_conn;
 119         struct obd_export *dlmexp;
 120         int rc = -ENOENT;
 121         ENTRY;
 122
 123         spin_lock(&imp->imp_lock);
 124         if (list_empty(&imp->imp_conn_list)) {
 125                 LASSERT(!imp->imp_conn_current);
 126                 LASSERT(!imp->imp_connection);
 127                 GOTO(out, rc);
 128         }
 129
 130         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 131                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 132                         continue;
 133                 LASSERT(imp_conn->oic_conn);
 134
 135                 /* is current conn? */
 136                 if (imp_conn == imp->imp_conn_current) {
 137                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 138
 139                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 140                             imp->imp_state != LUSTRE_IMP_DISCON) {
 141                                 CERROR("can't remove current connection\n");
 142                                 GOTO(out, rc = -EBUSY);
 143                         }
 144
 145                         ptlrpc_put_connection(imp->imp_connection);
 146                         imp->imp_connection = NULL;
 147
 148                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 149                         if (dlmexp && dlmexp->exp_connection) {
 150                                 LASSERT(dlmexp->exp_connection ==
 151                                         imp_conn->oic_conn);
 152                                 ptlrpc_put_connection(dlmexp->exp_connection);
 153                                 dlmexp->exp_connection = NULL;
 154                         }
 155                 }
 156
 157                 list_del(&imp_conn->oic_item);
 158                 ptlrpc_put_connection(imp_conn->oic_conn);
 159                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 160                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 161                        imp, imp->imp_obd->obd_name, uuid->uuid);
 162                 rc = 0;
 163                 break;
 164         }
 165 out:
 166         spin_unlock(&imp->imp_lock);
 167         if (rc == -ENOENT)
 168                 CERROR("connection %s not found\n", uuid->uuid);
 169         RETURN(rc);
 170 }
 171
 172 int client_obd_setup(struct obd_device *obddev, obd_count len, void *buf)
 173 {
 174         struct lustre_cfg* lcfg = buf;
 175         struct client_obd *cli = &obddev->u.cli;
 176         struct obd_import *imp;
 177         struct obd_uuid server_uuid;
 178         int rq_portal, rp_portal, connect_op;
 179         char *name = obddev->obd_type->typ_name;
 180         char *mgmt_name = NULL;
 181         int rc;
 182         struct obd_device *mgmt_obd;
 183         mgmtcli_register_for_events_t register_f;
 184         ENTRY;
 185
 186         /* In a more perfect world, we would hang a ptlrpc_client off of
 187          * obd_type and just use the values from there. */
 188         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 189                 rq_portal = OST_REQUEST_PORTAL;
 190                 rp_portal = OSC_REPLY_PORTAL;
 191                 connect_op = OST_CONNECT;
 192         } else if (!strcmp(name, LUSTRE_MDC_NAME)) {
 193                 rq_portal = MDS_REQUEST_PORTAL;
 194                 rp_portal = MDC_REPLY_PORTAL;
 195                 connect_op = MDS_CONNECT;
 196         } else if (!strcmp(name, LUSTRE_MGMTCLI_NAME)) {
 197                 rq_portal = MGMT_REQUEST_PORTAL;
 198                 rp_portal = MGMT_REPLY_PORTAL;
 199                 connect_op = MGMT_CONNECT;
 200         } else {
 201                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 202                        name);
 203                 RETURN(-EINVAL);
 204         }
 205
 206         if (lcfg->lcfg_inllen1 < 1) {
 207                 CERROR("requires a TARGET UUID\n");
 208                 RETURN(-EINVAL);
 209         }
 210
 211         if (lcfg->lcfg_inllen1 > 37) {
 212                 CERROR("client UUID must be less than 38 characters\n");
 213                 RETURN(-EINVAL);
 214         }
 215
 216         if (lcfg->lcfg_inllen2 < 1) {
 217                 CERROR("setup requires a SERVER UUID\n");
 218                 RETURN(-EINVAL);
 219         }
 220
 221         if (lcfg->lcfg_inllen2 > 37) {
 222                 CERROR("target UUID must be less than 38 characters\n");
 223                 RETURN(-EINVAL);
 224         }
 225
 226         sema_init(&cli->cl_sem, 1);
 227         cli->cl_conn_count = 0;
 228         memcpy(server_uuid.uuid, lcfg->lcfg_inlbuf2,
 229                min_t(unsigned int, lcfg->lcfg_inllen2, sizeof(server_uuid)));
 230
 231         cli->cl_dirty = 0;
 232         cli->cl_avail_grant = 0;
 233         /* FIXME: should limit this for the sum of all cl_dirty_max */
 234         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 235         if (cli->cl_dirty_max >> PAGE_SHIFT > num_physpages / 8)
 236                 cli->cl_dirty_max = num_physpages << (PAGE_SHIFT - 3);
 237         INIT_LIST_HEAD(&cli->cl_cache_waiters);
 238         INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 239         INIT_LIST_HEAD(&cli->cl_loi_write_list);
 240         INIT_LIST_HEAD(&cli->cl_loi_read_list);
 241         spin_lock_init(&cli->cl_loi_list_lock);
 242         cli->cl_r_in_flight = 0;
 243         cli->cl_w_in_flight = 0;
 244         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 245         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 246         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 247         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 248
 249         if (num_physpages <= 32768) { /* <= 128 MB */
 250                 cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES / 3;
 251                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT / 3;
 252         } else {
 253                 cli->cl_max_pages_per_rpc = PTLRPC_MAX_BRW_PAGES;
 254                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 255         }
 256
 257
 258         rc = ldlm_get_ref();
 259         if (rc) {
 260                 CERROR("ldlm_get_ref failed: %d\n", rc);
 261                 GOTO(err, rc);
 262         }
 263
 264         ptlrpc_init_client(rq_portal, rp_portal, name,
 265                            &obddev->obd_ldlm_client);
 266
 267         imp = class_new_import();
 268         if (imp == NULL)
 269                 GOTO(err_ldlm, rc = -ENOENT);
 270         imp->imp_client = &obddev->obd_ldlm_client;
 271         imp->imp_obd = obddev;
 272         imp->imp_connect_op = connect_op;
 273         imp->imp_generation = 0;
 274         imp->imp_initial_recov = 1;
 275         INIT_LIST_HEAD(&imp->imp_pinger_chain);
 276         memcpy(imp->imp_target_uuid.uuid, lcfg->lcfg_inlbuf1,
 277               lcfg->lcfg_inllen1);
 278         class_import_put(imp);
 279
 280         rc = client_import_add_conn(imp, &server_uuid, 1);
 281         if (rc) {
 282                 CERROR("can't add initial connection\n");
 283                 GOTO(err_import, rc);
 284         }
 285
 286         cli->cl_import = imp;
 287         cli->cl_max_mds_easize = sizeof(struct lov_mds_md);
 288         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 289         cli->cl_sandev = to_kdev_t(0);
 290
 291         if (lcfg->lcfg_inllen3 != 0) {
 292                 if (!strcmp(lcfg->lcfg_inlbuf3, "inactive")) {
 293                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 294                                name, obddev->obd_name,
 295                                imp->imp_target_uuid.uuid);
 296                         imp->imp_invalid = 1;
 297
 298                         if (lcfg->lcfg_inllen4 != 0)
 299                                 mgmt_name = lcfg->lcfg_inlbuf4;
 300                 } else {
 301                         mgmt_name = lcfg->lcfg_inlbuf3;
 302                 }
 303         }
 304
 305         if (mgmt_name != NULL) {
 306                 /* Register with management client if we need to. */
 307                 CDEBUG(D_HA, "%s registering with %s for events about %s\n",
 308                        obddev->obd_name, mgmt_name, server_uuid.uuid);
 309
 310                 mgmt_obd = class_name2obd(mgmt_name);
 311                 if (!mgmt_obd) {
 312                         CERROR("can't find mgmtcli %s to register\n",
 313                                mgmt_name);
 314                         GOTO(err_import, rc = -ENOSYS);
 315                 }
 316
 317                 register_f = inter_module_get("mgmtcli_register_for_events");
 318                 if (!register_f) {
 319                         CERROR("can't i_m_g mgmtcli_register_for_events\n");
 320                         GOTO(err_import, rc = -ENOSYS);
 321                 }
 322
 323                 rc = register_f(mgmt_obd, obddev, &imp->imp_target_uuid);
 324                 inter_module_put("mgmtcli_register_for_events");
 325
 326                 if (!rc)
 327                         cli->cl_mgmtcli_obd = mgmt_obd;
 328         }
 329
 330         RETURN(rc);
 331
 332 err_import:
 333         class_destroy_import(imp);
 334 err_ldlm:
 335         ldlm_put_ref(0);
 336 err:
 337         RETURN(rc);
 338
 339 }
 340
 341 int client_obd_cleanup(struct obd_device *obddev, int flags)
 342 {
 343         struct client_obd *cli = &obddev->u.cli;
 344
 345         if (!cli->cl_import)
 346                 RETURN(-EINVAL);
 347         if (cli->cl_mgmtcli_obd) {
 348                 mgmtcli_deregister_for_events_t dereg_f;
 349
 350                 dereg_f = inter_module_get("mgmtcli_deregister_for_events");
 351                 dereg_f(cli->cl_mgmtcli_obd, obddev);
 352                 inter_module_put("mgmtcli_deregister_for_events");
 353         }
 354         class_destroy_import(cli->cl_import);
 355         cli->cl_import = NULL;
 356
 357         ldlm_put_ref(flags & OBD_OPT_FORCE);
 358
 359         RETURN(0);
 360 }
 361
 362 int client_connect_import(struct lustre_handle *dlm_handle,
 363                           struct obd_device *obd,
 364                           struct obd_uuid *cluuid,
 365                           unsigned long connect_flags)
 366 {
 367         struct client_obd *cli = &obd->u.cli;
 368         struct obd_import *imp = cli->cl_import;
 369         struct obd_export *exp;
 370         int rc;
 371         ENTRY;
 372
 373         down(&cli->cl_sem);
 374         rc = class_connect(dlm_handle, obd, cluuid);
 375         if (rc)
 376                 GOTO(out_sem, rc);
 377
 378         cli->cl_conn_count++;
 379         if (cli->cl_conn_count > 1)
 380                 GOTO(out_sem, rc);
 381         exp = class_conn2export(dlm_handle);
 382
 383         if (obd->obd_namespace != NULL)
 384                 CERROR("already have namespace!\n");
 385         obd->obd_namespace = ldlm_namespace_new(obd->obd_name,
 386                                                 LDLM_NAMESPACE_CLIENT);
 387         if (obd->obd_namespace == NULL)
 388                 GOTO(out_disco, rc = -ENOMEM);
 389
 390         imp->imp_dlm_handle = *dlm_handle;
 391         rc = ptlrpc_init_import(imp);
 392         if (rc != 0)
 393                 GOTO(out_ldlm, rc);
 394
 395         imp->imp_connect_flags = connect_flags;
 396         rc = ptlrpc_connect_import(imp, NULL);
 397         if (rc != 0) {
 398                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 399                 GOTO(out_ldlm, rc);
 400         }
 401         LASSERT(exp->exp_connection);
 402         ptlrpc_pinger_add_import(imp);
 403         EXIT;
 404
 405         if (rc) {
 406 out_ldlm:
 407                 ldlm_namespace_free(obd->obd_namespace, 0);
 408                 obd->obd_namespace = NULL;
 409 out_disco:
 410                 cli->cl_conn_count--;
 411                 class_disconnect(exp, 0);
 412         } else {
 413                 class_export_put(exp);
 414         }
 415 out_sem:
 416         up(&cli->cl_sem);
 417         return rc;
 418 }
 419
 420 int client_disconnect_export(struct obd_export *exp, int flags)
 421 {
 422         struct obd_device *obd = class_exp2obd(exp);
 423         struct client_obd *cli = &obd->u.cli;
 424         struct obd_import *imp = cli->cl_import;
 425         int rc = 0, err;
 426         ENTRY;
 427
 428         if (!obd) {
 429                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 430                        exp, exp ? exp->exp_handle.h_cookie : -1);
 431                 RETURN(-EINVAL);
 432         }
 433
 434         down(&cli->cl_sem);
 435         if (!cli->cl_conn_count) {
 436                 CERROR("disconnecting disconnected device (%s)\n",
 437                        obd->obd_name);
 438                 GOTO(out_sem, rc = -EINVAL);
 439         }
 440
 441         cli->cl_conn_count--;
 442         if (cli->cl_conn_count)
 443                 GOTO(out_no_disconnect, rc = 0);
 444
 445         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 446          * delete it regardless.  (It's safe to delete an import that was
 447          * never added.) */
 448         (void)ptlrpc_pinger_del_import(imp);
 449
 450         if (obd->obd_namespace != NULL) {
 451                 /* obd_no_recov == local only */
 452                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 453                                        obd->obd_no_recov, NULL);
 454                 ldlm_namespace_free(obd->obd_namespace, obd->obd_no_recov);
 455                 obd->obd_namespace = NULL;
 456         }
 457
 458         /* Yeah, obd_no_recov also (mainly) means "forced shutdown". */
 459         if (obd->obd_no_recov)
 460                 ptlrpc_invalidate_import(imp, 0);
 461         else
 462                 rc = ptlrpc_disconnect_import(imp);
 463
 464         EXIT;
 465  out_no_disconnect:
 466         err = class_disconnect(exp, 0);
 467         if (!rc && err)
 468                 rc = err;
 469  out_sem:
 470         up(&cli->cl_sem);
 471         RETURN(rc);
 472 }
 473
 474 /* --------------------------------------------------------------------------
 475  * from old lib/target.c
 476  * -------------------------------------------------------------------------- */
 477
 478 int target_handle_reconnect(struct lustre_handle *conn, struct obd_export *exp,
 479                             struct obd_uuid *cluuid, int initial_conn)
 480 {
 481         if (exp->exp_connection && !initial_conn) {
 482                 struct lustre_handle *hdl;
 483                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 484                 /* Might be a re-connect after a partition. */
 485                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 486                         CERROR("%s reconnecting\n", cluuid->uuid);
 487                         conn->cookie = exp->exp_handle.h_cookie;
 488                         RETURN(EALREADY);
 489                 } else {
 490                         CERROR("%s reconnecting from %s, "
 491                                "handle mismatch (ours "LPX64", theirs "
 492                                LPX64")\n", cluuid->uuid,
 493                                exp->exp_connection->c_remote_uuid.uuid,
 494                                hdl->cookie, conn->cookie);
 495                         memset(conn, 0, sizeof *conn);
 496                         RETURN(-EALREADY);
 497                 }
 498         }
 499
 500         conn->cookie = exp->exp_handle.h_cookie;
 501         CDEBUG(D_INFO, "existing export for UUID '%s' at %p\n",
 502                cluuid->uuid, exp);
 503         CDEBUG(D_IOCTL,"connect: cookie "LPX64"\n", conn->cookie);
 504         RETURN(0);
 505 }
 506
 507 static char nidstr[PTL_NALFMT_SIZE];
 508 int target_handle_connect(struct ptlrpc_request *req)
 509 {
 510         unsigned long connect_flags = 0, *cfp;
 511         struct obd_device *target;
 512         struct obd_export *export = NULL;
 513         struct obd_import *revimp;
 514         struct lustre_handle conn;
 515         struct obd_uuid tgtuuid;
 516         struct obd_uuid cluuid;
 517         struct obd_uuid remote_uuid;
 518         struct list_head *p;
 519         char *str, *tmp;
 520         int rc = 0;
 521         unsigned long flags;
 522         int initial_conn = 0;
 523         char peer_str[PTL_NALFMT_SIZE];
 524         ENTRY;
 525
 526         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 527
 528         LASSERT_REQSWAB (req, 0);
 529         str = lustre_msg_string(req->rq_reqmsg, 0, sizeof(tgtuuid) - 1);
 530         if (str == NULL) {
 531                 CERROR("bad target UUID for connect\n");
 532                 GOTO(out, rc = -EINVAL);
 533         }
 534
 535         obd_str2uuid (&tgtuuid, str);
 536         target = class_uuid2obd(&tgtuuid);
 537         if (!target) {
 538                 target = class_name2obd(str);
 539         }
 540
 541         if (!target || target->obd_stopping || !target->obd_set_up) {
 542                 CERROR("UUID '%s' is not available for connect from NID %s\n",
 543                        str, ptlrpc_peernid2str(&req->rq_peer, nidstr));
 544                 GOTO(out, rc = -ENODEV);
 545         }
 546
 547         LASSERT_REQSWAB (req, 1);
 548         str = lustre_msg_string(req->rq_reqmsg, 1, sizeof(cluuid) - 1);
 549         if (str == NULL) {
 550                 CERROR("bad client UUID for connect\n");
 551                 GOTO(out, rc = -EINVAL);
 552         }
 553
 554         obd_str2uuid (&cluuid, str);
 555
 556         /* XXX extract a nettype and format accordingly */
 557         switch (sizeof(ptl_nid_t)) {
 558                 /* NB the casts only avoid compiler warnings */
 559         case 8:
 560                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 561                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.peer_id.nid);
 562                 break;
 563         case 4:
 564                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 565                          "NET_%x_UUID", (__u32)req->rq_peer.peer_id.nid);
 566                 break;
 567         default:
 568                 LBUG();
 569         }
 570
 571         tmp = lustre_msg_buf(req->rq_reqmsg, 2, sizeof conn);
 572         if (tmp == NULL)
 573                 GOTO(out, rc = -EPROTO);
 574
 575         memcpy(&conn, tmp, sizeof conn);
 576
 577         cfp = lustre_msg_buf(req->rq_reqmsg, 3, sizeof(unsigned long));
 578         LASSERT(cfp != NULL);
 579         connect_flags = *cfp;
 580
 581         rc = lustre_pack_reply(req, 0, NULL, NULL);
 582         if (rc)
 583                 GOTO(out, rc);
 584
 585         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_INITIAL)
 586                 initial_conn = 1;
 587
 588         /* lctl gets a backstage, all-access pass. */
 589         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 590                 goto dont_check_exports;
 591
 592         spin_lock(&target->obd_dev_lock);
 593         list_for_each(p, &target->obd_exports) {
 594                 export = list_entry(p, struct obd_export, exp_obd_chain);
 595                 if (obd_uuid_equals(&cluuid, &export->exp_client_uuid)) {
 596                         spin_unlock(&target->obd_dev_lock);
 597                         LASSERT(export->exp_obd == target);
 598
 599                         rc = target_handle_reconnect(&conn, export, &cluuid,
 600                                                      initial_conn);
 601                         break;
 602                 }
 603                 export = NULL;
 604         }
 605         /* If we found an export, we already unlocked. */
 606         if (!export) {
 607                 spin_unlock(&target->obd_dev_lock);
 608         } else if (req->rq_export == NULL &&
 609                    atomic_read(&export->exp_rpc_count) > 0) {
 610                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
 611                       target->obd_name, cluuid.uuid,
 612                       ptlrpc_peernid2str(&req->rq_peer, peer_str),
 613                       export, atomic_read(&export->exp_refcount));
 614                 GOTO(out, rc = -EBUSY);
 615         } else if (req->rq_export != NULL &&
 616                    atomic_read(&export->exp_rpc_count) > 1) {
 617                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
 618                       target->obd_name, cluuid.uuid,
 619                       ptlrpc_peernid2str(&req->rq_peer, peer_str),
 620                       export, atomic_read(&export->exp_rpc_count));
 621                 GOTO(out, rc = -EBUSY);
 622         }
 623         else if (req->rq_reqmsg->conn_cnt == 1 && !initial_conn) {
 624                 CERROR("%s reconnected with 1 conn_cnt; cookies not random?\n",
 625                        cluuid.uuid);
 626                 GOTO(out, rc = -EALREADY);
 627         }
 628
 629         /* Tell the client if we're in recovery. */
 630         /* If this is the first client, start the recovery timer */
 631         CWARN("%s: connection from %s@%s/%lu %s\n", target->obd_name, cluuid.uuid,
 632               ptlrpc_peernid2str(&req->rq_peer, peer_str), *cfp,
 633               target->obd_recovering ? "(recovering)" : "");
 634         if (target->obd_recovering) {
 635                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 636                 target_start_recovery_timer(target);
 637         }
 638 #if 0
 639         /* Tell the client if we support replayable requests */
 640         if (target->obd_replayable)
 641                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 642 #endif
 643         if (export == NULL) {
 644                 if (target->obd_recovering) {
 645                         CERROR("%s denying connection for new client %s@%s: "
 646                                "%d clients in recovery for %lds\n", target->obd_name,
 647                                cluuid.uuid,
 648                                ptlrpc_peernid2str(&req->rq_peer, peer_str),
 649                                target->obd_recoverable_clients,
 650                                (target->obd_recovery_timer.expires-jiffies)/HZ);
 651                         rc = -EBUSY;
 652                 } else {
 653  dont_check_exports:
 654                         rc = obd_connect(&conn, target, &cluuid, connect_flags);
 655                 }
 656         }
 657         /* Tell the client if we support replayable requests */
 658         if (target->obd_replayable)
 659                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 660
 661         /* If all else goes well, this is our RPC return code. */
 662         req->rq_status = 0;
 663
 664         if (rc && rc != EALREADY)
 665                 GOTO(out, rc);
 666
 667         req->rq_repmsg->handle = conn;
 668
 669         /* If the client and the server are the same node, we will already
 670          * have an export that really points to the client's DLM export,
 671          * because we have a shared handles table.
 672          *
 673          * XXX this will go away when shaver stops sending the "connect" handle
 674          * in the real "remote handle" field of the request --phik 24 Apr 2003
 675          */
 676         if (req->rq_export != NULL)
 677                 class_export_put(req->rq_export);
 678
 679         /* ownership of this export ref transfers to the request */
 680         export = req->rq_export = class_conn2export(&conn);
 681         LASSERT(export != NULL);
 682
 683         spin_lock_irqsave(&export->exp_lock, flags);
 684         if (initial_conn) {
 685                 req->rq_repmsg->conn_cnt = export->exp_conn_cnt + 1;
 686         } else if (export->exp_conn_cnt >= req->rq_reqmsg->conn_cnt) {
 687                 CERROR("%s@%s: already connected at a higher conn_cnt: %d > %d\n",
 688                        cluuid.uuid, ptlrpc_peernid2str(&req->rq_peer, peer_str),
 689                        export->exp_conn_cnt,
 690                        req->rq_reqmsg->conn_cnt);
 691                 spin_unlock_irqrestore(&export->exp_lock, flags);
 692                 GOTO(out, rc = -EALREADY);
 693         }
 694         export->exp_conn_cnt = req->rq_reqmsg->conn_cnt;
 695         spin_unlock_irqrestore(&export->exp_lock, flags);
 696
 697         /* request from liblustre? */
 698         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT)
 699                 export->exp_libclient = 1;
 700
 701         if (export->exp_connection != NULL)
 702                 ptlrpc_put_connection(export->exp_connection);
 703         export->exp_connection = ptlrpc_get_connection(&req->rq_peer,
 704                                                        &remote_uuid);
 705
 706         if (rc == EALREADY) {
 707                 /* We indicate the reconnection in a flag, not an error code. */
 708                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 709                 GOTO(out, rc = 0);
 710         }
 711
 712         if (target->obd_recovering) {
 713                 target->obd_connected_clients++;
 714         }
 715
 716         memcpy(&conn, lustre_msg_buf(req->rq_reqmsg, 2, sizeof conn),
 717                sizeof conn);
 718
 719         if (export->exp_imp_reverse != NULL)
 720                 class_destroy_import(export->exp_imp_reverse);
 721         revimp = export->exp_imp_reverse = class_new_import();
 722         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
 723         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
 724         revimp->imp_remote_handle = conn;
 725         revimp->imp_obd = target;
 726         revimp->imp_dlm_fake = 1;
 727         revimp->imp_state = LUSTRE_IMP_FULL;
 728         class_import_put(revimp);
 729
 730         rc = obd_connect_post(export, connect_flags);
 731 out:
 732         if (rc)
 733                 req->rq_status = rc;
 734         RETURN(rc);
 735 }
 736
 737 int target_handle_disconnect(struct ptlrpc_request *req)
 738 {
 739         struct obd_export *exp;
 740         int rc;
 741         ENTRY;
 742
 743         rc = lustre_pack_reply(req, 0, NULL, NULL);
 744         if (rc)
 745                 RETURN(rc);
 746
 747         /* keep the rq_export around so we can send the reply */
 748         exp = class_export_get(req->rq_export);
 749         req->rq_status = obd_disconnect(exp, 0);
 750         RETURN(0);
 751 }
 752
 753 void target_destroy_export(struct obd_export *exp)
 754 {
 755         /* exports created from last_rcvd data, and "fake"
 756            exports created by lctl don't have an import */
 757         if (exp->exp_imp_reverse != NULL)
 758                 class_destroy_import(exp->exp_imp_reverse);
 759
 760         /* We cancel locks at disconnect time, but this will catch any locks
 761          * granted in a race with recovery-induced disconnect. */
 762         if (exp->exp_obd->obd_namespace != NULL)
 763                 ldlm_cancel_locks_for_export(exp);
 764 }
 765
 766 /*
 767  * Recovery functions
 768  */
 769
 770 struct ptlrpc_request *
 771 ptlrpc_clone_req( struct ptlrpc_request *orig_req)
 772 {
 773         struct ptlrpc_request *copy_req;
 774         struct lustre_msg *copy_reqmsg;
 775
 776         OBD_ALLOC(copy_req, sizeof *copy_req);
 777         if (!copy_req)
 778                 return NULL;
 779         OBD_ALLOC(copy_reqmsg, orig_req->rq_reqlen);
 780         if (!copy_reqmsg){
 781                 OBD_FREE(copy_req, sizeof *copy_req);
 782                 return NULL;
 783         }
 784
 785         memcpy(copy_req, orig_req, sizeof *copy_req);
 786         memcpy(copy_reqmsg, orig_req->rq_reqmsg, orig_req->rq_reqlen);
 787         /* the copied req takes over the reply state */
 788         orig_req->rq_reply_state = NULL;
 789
 790         copy_req->rq_reqmsg = copy_reqmsg;
 791         class_export_get(copy_req->rq_export);
 792         INIT_LIST_HEAD(&copy_req->rq_list);
 793
 794         return copy_req;
 795 }
 796 void ptlrpc_free_clone( struct ptlrpc_request *req)
 797 {
 798         class_export_put(req->rq_export);
 799         list_del(&req->rq_list);
 800         OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 801         OBD_FREE(req, sizeof *req);
 802 }
 803
 804
 805
 806 static void target_release_saved_req(struct ptlrpc_request *req)
 807 {
 808         class_export_put(req->rq_export);
 809         OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 810         OBD_FREE(req, sizeof *req);
 811 }
 812
 813 #ifdef __KERNEL__
 814 static void target_finish_recovery(struct obd_device *obd)
 815 {
 816         struct list_head *tmp, *n;
 817         int rc;
 818
 819         CWARN("%s: sending delayed replies to recovered clients\n",
 820               obd->obd_name);
 821
 822         ldlm_reprocess_all_ns(obd->obd_namespace);
 823
 824         /* when recovery finished, cleanup orphans on mds and ost */
 825         if (OBT(obd) && OBP(obd, postrecov)) {
 826                 rc = OBP(obd, postrecov)(obd);
 827                 if (rc >= 0)
 828                         CWARN("%s: all clients recovered, %d MDS "
 829                               "orphans deleted\n", obd->obd_name, rc);
 830                 else
 831                         CERROR("postrecov failed %d\n", rc);
 832         }
 833
 834
 835         list_for_each_safe(tmp, n, &obd->obd_delayed_reply_queue) {
 836                 struct ptlrpc_request *req;
 837                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 838                 list_del(&req->rq_list);
 839                 DEBUG_REQ(D_ERROR, req, "delayed:");
 840                 ptlrpc_reply(req);
 841                 target_release_saved_req(req);
 842         }
 843         obd->obd_recovery_end = LTIME_S(CURRENT_TIME);
 844         return;
 845 }
 846
 847 static void abort_recovery_queue(struct obd_device *obd)
 848 {
 849         struct ptlrpc_request *req;
 850         struct list_head *tmp, *n;
 851         int rc;
 852
 853         list_for_each_safe(tmp, n, &obd->obd_recovery_queue) {
 854                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 855                 list_del(&req->rq_list);
 856                 DEBUG_REQ(D_ERROR, req, "aborted:");
 857                 req->rq_status = -ENOTCONN;
 858                 req->rq_type = PTL_RPC_MSG_ERR;
 859                 rc = lustre_pack_reply(req, 0, NULL, NULL);
 860                 if (rc == 0) {
 861                         ptlrpc_reply(req);
 862                 } else {
 863                         DEBUG_REQ(D_ERROR, req,
 864                                   "packing failed for abort-reply; skipping");
 865                 }
 866                 target_release_saved_req(req);
 867         }
 868 }
 869 #endif
 870
 871 /* Called from a cleanup function if the device is being cleaned up
 872    forcefully.  The exports should all have been disconnected already,
 873    the only thing left to do is
 874      - clear the recovery flags
 875      - cancel the timer
 876      - free queued requests and replies, but don't send replies
 877    Because the obd_stopping flag is set, no new requests should be received.
 878
 879 */
 880 void target_cleanup_recovery(struct obd_device *obd)
 881 {
 882         struct list_head *tmp, *n;
 883         struct ptlrpc_request *req;
 884
 885         spin_lock_bh(&obd->obd_processing_task_lock);
 886         if (!obd->obd_recovering) {
 887                 spin_unlock_bh(&obd->obd_processing_task_lock);
 888                 EXIT;
 889                 return;
 890         }
 891         obd->obd_recovering = obd->obd_abort_recovery = 0;
 892         target_cancel_recovery_timer(obd);
 893         spin_unlock_bh(&obd->obd_processing_task_lock);
 894
 895         list_for_each_safe(tmp, n, &obd->obd_delayed_reply_queue) {
 896                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 897                 list_del(&req->rq_list);
 898                 LASSERT (req->rq_reply_state);
 899                 lustre_free_reply_state(req->rq_reply_state);
 900                 target_release_saved_req(req);
 901         }
 902         list_for_each_safe(tmp, n, &obd->obd_recovery_queue) {
 903                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 904                 list_del(&req->rq_list);
 905                 LASSERT (req->rq_reply_state == 0);
 906                 target_release_saved_req(req);
 907          }
 908 }
 909
 910 #ifdef __KERNEL__
 911 static void target_abort_recovery(void *data)
 912 {
 913         struct obd_device *obd = data;
 914
 915         LASSERT(!obd->obd_recovering);
 916
 917         class_disconnect_stale_exports(obd, 0);
 918
 919         CERROR("%s: recovery period over; disconnecting unfinished clients.\n",
 920                obd->obd_name);
 921
 922         abort_recovery_queue(obd);
 923         target_finish_recovery(obd);
 924         ptlrpc_run_recovery_over_upcall(obd);
 925 }
 926 #endif
 927
 928 static void target_recovery_expired(unsigned long castmeharder)
 929 {
 930         struct obd_device *obd = (struct obd_device *)castmeharder;
 931         CERROR("recovery timed out, aborting\n");
 932         spin_lock_bh(&obd->obd_processing_task_lock);
 933         if (obd->obd_recovering)
 934                 obd->obd_abort_recovery = 1;
 935
 936         wake_up(&obd->obd_next_transno_waitq);
 937         spin_unlock_bh(&obd->obd_processing_task_lock);
 938 }
 939
 940
 941 /* obd_processing_task_lock should be held */
 942 void target_cancel_recovery_timer(struct obd_device *obd)
 943 {
 944         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
 945         del_timer(&obd->obd_recovery_timer);
 946 }
 947
 948 #ifdef __KERNEL__
 949 static void reset_recovery_timer(struct obd_device *obd)
 950 {
 951         spin_lock_bh(&obd->obd_processing_task_lock);
 952         if (!obd->obd_recovering) {
 953                 spin_unlock_bh(&obd->obd_processing_task_lock);
 954                 return;
 955         }
 956         CDEBUG(D_HA, "timer will expire in %u seconds\n",
 957                OBD_RECOVERY_TIMEOUT / HZ);
 958         mod_timer(&obd->obd_recovery_timer, jiffies + OBD_RECOVERY_TIMEOUT);
 959         spin_unlock_bh(&obd->obd_processing_task_lock);
 960 }
 961 #endif
 962
 963 /* Only start it the first time called */
 964 void target_start_recovery_timer(struct obd_device *obd)
 965 {
 966         spin_lock_bh(&obd->obd_processing_task_lock);
 967         if (!obd->obd_recovering || timer_pending(&obd->obd_recovery_timer)) {
 968                 spin_unlock_bh(&obd->obd_processing_task_lock);
 969                 return;
 970         }
 971         CWARN("%s: starting recovery timer (%us)\n", obd->obd_name,
 972                OBD_RECOVERY_TIMEOUT / HZ);
 973         obd->obd_recovery_timer.function = target_recovery_expired;
 974         obd->obd_recovery_timer.data = (unsigned long)obd;
 975         mod_timer(&obd->obd_recovery_timer, jiffies + OBD_RECOVERY_TIMEOUT);
 976         spin_unlock_bh(&obd->obd_processing_task_lock);
 977 }
 978
 979 #ifdef __KERNEL__
 980 static int check_for_next_transno(struct obd_device *obd)
 981 {
 982         struct ptlrpc_request *req = NULL;
 983         int wake_up = 0, connected, completed, queue_len, max;
 984         __u64 next_transno, req_transno;
 985
 986         spin_lock_bh(&obd->obd_processing_task_lock);
 987         if (!list_empty(&obd->obd_recovery_queue)) {
 988                 req = list_entry(obd->obd_recovery_queue.next,
 989                                  struct ptlrpc_request, rq_list);
 990                 req_transno = req->rq_reqmsg->transno;
 991         } else {
 992                 req_transno = 0;
 993         }
 994
 995         max = obd->obd_max_recoverable_clients;
 996         connected = obd->obd_connected_clients;
 997         completed = max - obd->obd_recoverable_clients;
 998         queue_len = obd->obd_requests_queued_for_recovery;
 999         next_transno = obd->obd_next_recovery_transno;
1000
1001         CDEBUG(D_HA,"max: %d, connected: %d, completed: %d, queue_len: %d, "
1002                "req_transno: "LPU64", next_transno: "LPU64"\n",
1003                max, connected, completed, queue_len, req_transno, next_transno);
1004         if (obd->obd_abort_recovery) {
1005                 CDEBUG(D_HA, "waking for aborted recovery\n");
1006                 wake_up = 1;
1007         } else if (max == completed) {
1008                 CDEBUG(D_HA, "waking for completed recovery\n");
1009                 wake_up = 1;
1010         } else if (req_transno == next_transno) {
1011                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1012                 wake_up = 1;
1013         } else if (queue_len + completed == max) {
1014                 LASSERT(req->rq_reqmsg->transno >= next_transno);
1015                 CDEBUG(D_ERROR,
1016                        "waking for skipped transno (skip: "LPD64
1017                        ", ql: %d, comp: %d, conn: %d, next: "LPD64")\n",
1018                        next_transno, queue_len, completed, max, req_transno);
1019                 obd->obd_next_recovery_transno = req_transno;
1020                 wake_up = 1;
1021         }
1022         spin_unlock_bh(&obd->obd_processing_task_lock);
1023
1024         return wake_up;
1025 }
1026
1027 static struct ptlrpc_request *
1028 target_next_replay_req(struct obd_device *obd)
1029 {
1030         struct l_wait_info lwi = { 0 };
1031         struct ptlrpc_request *req;
1032
1033         CDEBUG(D_HA, "Waiting for transno "LPD64"\n",
1034                obd->obd_next_recovery_transno);
1035         l_wait_event(obd->obd_next_transno_waitq,
1036                      check_for_next_transno(obd), &lwi);
1037
1038         spin_lock_bh(&obd->obd_processing_task_lock);
1039         if (obd->obd_abort_recovery) {
1040                 req = NULL;
1041         } else if (!list_empty(&obd->obd_recovery_queue)) {
1042                 req = list_entry(obd->obd_recovery_queue.next,
1043                                  struct ptlrpc_request, rq_list);
1044                 list_del_init(&req->rq_list);
1045                 obd->obd_requests_queued_for_recovery--;
1046         } else {
1047                 req = NULL;
1048         }
1049         spin_unlock_bh(&obd->obd_processing_task_lock);
1050         return req;
1051 }
1052
1053 static int target_recovery_thread(void *arg)
1054 {
1055         struct obd_device *obd = arg;
1056         struct ptlrpc_request *req;
1057         struct target_recovery_data *trd = &obd->obd_recovery_data;
1058         unsigned long flags;
1059         ENTRY;
1060
1061         kportal_daemonize("tgt-recov");
1062
1063         SIGNAL_MASK_LOCK(current, flags);
1064         sigfillset(&current->blocked);
1065         RECALC_SIGPENDING;
1066         SIGNAL_MASK_UNLOCK(current, flags);
1067
1068         CERROR("%s: started recovery thread pid %d\n", obd->obd_name,
1069                current->pid);
1070         trd->trd_processing_task = current->pid;
1071
1072         obd->obd_recovering = 1;
1073         complete(&trd->trd_starting);
1074
1075         while (obd->obd_recovering) {
1076                 LASSERT(trd->trd_processing_task == current->pid);
1077                 req = target_next_replay_req(obd);
1078                 if (req != NULL) {
1079                         char peer_str[PTL_NALFMT_SIZE];
1080                         DEBUG_REQ(D_HA, req, "processing t"LPD64" from %s: ",
1081                                   req->rq_reqmsg->transno,
1082                                   ptlrpc_peernid2str(&req->rq_peer, peer_str));
1083                         (void)trd->trd_recovery_handler(req);
1084                         obd->obd_replayed_requests++;
1085                         reset_recovery_timer(obd);
1086                         /* bug 1580: decide how to properly sync() in recovery*/
1087                         //mds_fsync_super(mds->mds_sb);
1088                         ptlrpc_free_clone(req);
1089                         spin_lock_bh(&obd->obd_processing_task_lock);
1090                         obd->obd_next_recovery_transno++;
1091                         spin_unlock_bh(&obd->obd_processing_task_lock);
1092                 } else {
1093                         /* recovery is over */
1094                         spin_lock_bh(&obd->obd_processing_task_lock);
1095                         obd->obd_recovering = 0;
1096                         target_cancel_recovery_timer(obd);
1097                         if (obd->obd_abort_recovery) {
1098                                 obd->obd_abort_recovery = 0;
1099                                 spin_unlock_bh(&obd->obd_processing_task_lock);
1100                                 target_abort_recovery(obd);
1101                         } else {
1102                                 LASSERT(obd->obd_recoverable_clients == 0);
1103                                 spin_unlock_bh(&obd->obd_processing_task_lock);
1104                                 target_finish_recovery(obd);
1105                         }
1106                 }
1107         }
1108
1109         trd->trd_processing_task = 0;
1110         complete(&trd->trd_finishing);
1111         return 0;
1112 }
1113
1114 int target_start_recovery_thread(struct obd_device *obd, svc_handler_t handler)
1115 {
1116         int rc = 0;
1117         struct target_recovery_data *trd = &obd->obd_recovery_data;
1118
1119         memset(trd, 0, sizeof(*trd));
1120         init_completion(&trd->trd_starting);
1121         init_completion(&trd->trd_finishing);
1122         trd->trd_recovery_handler = handler;
1123
1124         if (kernel_thread(target_recovery_thread, obd, 0) == 0)
1125                 wait_for_completion(&trd->trd_starting);
1126         else
1127                 rc = -ECHILD;
1128
1129         return rc;
1130 }
1131
1132 void target_stop_recovery_thread(struct obd_device *obd)
1133 {
1134         spin_lock_bh(&obd->obd_processing_task_lock);
1135         if (obd->obd_recovery_data.trd_processing_task > 0) {
1136                 struct target_recovery_data *trd = &obd->obd_recovery_data;
1137                 CERROR("%s: aborting recovery\n", obd->obd_name);
1138                 obd->obd_abort_recovery = 1;
1139                 wake_up(&obd->obd_next_transno_waitq);
1140                 spin_unlock_bh(&obd->obd_processing_task_lock);
1141                 wait_for_completion(&trd->trd_finishing);
1142         } else {
1143                 spin_unlock_bh(&obd->obd_processing_task_lock);
1144         }
1145 }
1146 #endif
1147
1148 int target_queue_recovery_request(struct ptlrpc_request *req,
1149                                   struct obd_device *obd)
1150 {
1151         struct list_head *tmp;
1152         int inserted = 0;
1153         __u64 transno = req->rq_reqmsg->transno;
1154
1155         /* CAVEAT EMPTOR: The incoming request message has been swabbed
1156          * (i.e. buflens etc are in my own byte order), but type-dependent
1157          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
1158
1159         if (!transno) {
1160                 INIT_LIST_HEAD(&req->rq_list);
1161                 DEBUG_REQ(D_HA, req, "not queueing");
1162                 return 1;
1163         }
1164
1165
1166         /* If we're processing the queue, we want don't want to queue this
1167          * message.
1168          *
1169          * Also, if this request has a transno less than the one we're waiting
1170          * for, we should process it now.  It could (and currently always will)
1171          * be an open request for a descriptor that was opened some time ago.
1172          *
1173          * Also, a resent, replayed request that has already been
1174          * handled will pass through here and be processed immediately.
1175          */
1176         spin_lock_bh(&obd->obd_processing_task_lock);
1177         if (obd->obd_recovery_data.trd_processing_task == current->pid ||
1178             transno < obd->obd_next_recovery_transno) {
1179                 /* Processing the queue right now, don't re-add. */
1180                 lustre_msg_clear_flags(req->rq_reqmsg, MSG_RESENT);
1181                 LASSERT(list_empty(&req->rq_list));
1182                 spin_unlock_bh(&obd->obd_processing_task_lock);
1183                 return 1;
1184         }
1185         spin_unlock_bh(&obd->obd_processing_task_lock);
1186
1187         /* A resent, replayed request that is still on the queue; just drop it.
1188            The queued request will handle this. */
1189         if ((lustre_msg_get_flags(req->rq_reqmsg) & (MSG_RESENT | MSG_REPLAY))
1190             == (MSG_RESENT | MSG_REPLAY)) {
1191                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
1192                 return 0;
1193         }
1194
1195         req = ptlrpc_clone_req(req);
1196         if (req == NULL)
1197                 return -ENOMEM;
1198
1199         spin_lock_bh(&obd->obd_processing_task_lock);
1200
1201         /* XXX O(n^2) */
1202         list_for_each(tmp, &obd->obd_recovery_queue) {
1203                 struct ptlrpc_request *reqiter =
1204                         list_entry(tmp, struct ptlrpc_request, rq_list);
1205
1206                 if (reqiter->rq_reqmsg->transno > transno) {
1207                         list_add_tail(&req->rq_list, &reqiter->rq_list);
1208                         inserted = 1;
1209                         break;
1210                 }
1211         }
1212
1213         if (!inserted) {
1214                 list_add_tail(&req->rq_list, &obd->obd_recovery_queue);
1215         }
1216
1217         obd->obd_requests_queued_for_recovery++;
1218         wake_up(&obd->obd_next_transno_waitq);
1219         spin_unlock_bh(&obd->obd_processing_task_lock);
1220
1221         return 0;
1222 }
1223
1224 struct obd_device * target_req2obd(struct ptlrpc_request *req)
1225 {
1226         return req->rq_export->exp_obd;
1227 }
1228
1229 int target_queue_final_reply(struct ptlrpc_request *req, int rc)
1230 {
1231         struct obd_device *obd = target_req2obd(req);
1232
1233         LASSERT ((rc == 0) == (req->rq_reply_state != NULL));
1234
1235         if (rc) {
1236                 /* Just like ptlrpc_error, but without the sending. */
1237                 rc = lustre_pack_reply(req, 0, NULL, NULL);
1238                 LASSERT(rc == 0); /* XXX handle this */
1239                 req->rq_type = PTL_RPC_MSG_ERR;
1240         }
1241
1242         LASSERT (!req->rq_reply_state->rs_difficult);
1243         LASSERT(list_empty(&req->rq_list));
1244
1245         req = ptlrpc_clone_req(req);
1246
1247         spin_lock_bh(&obd->obd_processing_task_lock);
1248
1249         list_add(&req->rq_list, &obd->obd_delayed_reply_queue);
1250
1251         /* only count the first "replay over" request from each
1252            export */
1253         if (req->rq_export->exp_replay_needed) {
1254                 --obd->obd_recoverable_clients;
1255                 req->rq_export->exp_replay_needed = 0;
1256                 CWARN("%s: %d recoverable clients remain\n",
1257                       obd->obd_name, obd->obd_recoverable_clients);
1258         }
1259         wake_up(&obd->obd_next_transno_waitq);
1260         spin_unlock_bh(&obd->obd_processing_task_lock);
1261         return 1;
1262 }
1263
1264 int
1265 target_send_reply_msg (struct ptlrpc_request *req, int rc, int fail_id)
1266 {
1267         if (OBD_FAIL_CHECK(fail_id | OBD_FAIL_ONCE)) {
1268                 obd_fail_loc |= OBD_FAIL_ONCE | OBD_FAILED;
1269                 DEBUG_REQ(D_ERROR, req, "dropping reply");
1270                 /* NB this does _not_ send with ACK disabled, to simulate
1271                  * sending OK, but timing out for the ACK */
1272                 if (req->rq_reply_state != NULL) {
1273                         if (!req->rq_reply_state->rs_difficult) {
1274                                 lustre_free_reply_state (req->rq_reply_state);
1275                                 req->rq_reply_state = NULL;
1276                         } else {
1277                                 struct ptlrpc_service *svc =
1278                                         req->rq_rqbd->rqbd_srv_ni->sni_service;
1279                                 atomic_inc(&svc->srv_outstanding_replies);
1280                         }
1281                 }
1282                 return (-ECOMM);
1283         }
1284
1285         if (rc) {
1286                 req->rq_status = rc;
1287                 return (ptlrpc_error(req));
1288         } else {
1289                 DEBUG_REQ(D_NET, req, "sending reply");
1290         }
1291
1292         return (ptlrpc_send_reply(req, 1));
1293 }
1294
1295 void
1296 target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
1297 {
1298         int                        netrc;
1299         unsigned long              flags;
1300         struct ptlrpc_reply_state *rs;
1301         struct obd_device         *obd;
1302         struct obd_export         *exp;
1303         struct ptlrpc_srv_ni      *sni;
1304         struct ptlrpc_service     *svc;
1305
1306         sni = req->rq_rqbd->rqbd_srv_ni;
1307         svc = sni->sni_service;
1308
1309         rs = req->rq_reply_state;
1310         if (rs == NULL || !rs->rs_difficult) {
1311                 /* The easy case; no notifiers and reply_out_callback()
1312                  * cleans up (i.e. we can't look inside rs after a
1313                  * successful send) */
1314                 netrc = target_send_reply_msg (req, rc, fail_id);
1315
1316                 LASSERT (netrc == 0 || req->rq_reply_state == NULL);
1317                 return;
1318         }
1319
1320         /* must be an export if locks saved */
1321         LASSERT (req->rq_export != NULL);
1322         /* req/reply consistent */
1323         LASSERT (rs->rs_srv_ni == sni);
1324
1325         /* "fresh" reply */
1326         LASSERT (!rs->rs_scheduled);
1327         LASSERT (!rs->rs_scheduled_ever);
1328         LASSERT (!rs->rs_handled);
1329         LASSERT (!rs->rs_on_net);
1330         LASSERT (rs->rs_export == NULL);
1331         LASSERT (list_empty(&rs->rs_obd_list));
1332         LASSERT (list_empty(&rs->rs_exp_list));
1333
1334         exp = class_export_get (req->rq_export);
1335         obd = exp->exp_obd;
1336
1337         /* disable reply scheduling onto srv_reply_queue while I'm setting up */
1338         rs->rs_scheduled = 1;
1339         rs->rs_on_net    = 1;
1340         rs->rs_xid       = req->rq_xid;
1341         rs->rs_transno   = req->rq_transno;
1342         rs->rs_export    = exp;
1343
1344         spin_lock_irqsave (&obd->obd_uncommitted_replies_lock, flags);
1345
1346         if (rs->rs_transno > obd->obd_last_committed) {
1347                 /* not committed already */
1348                 list_add_tail (&rs->rs_obd_list,
1349                                &obd->obd_uncommitted_replies);
1350         }
1351
1352         spin_unlock (&obd->obd_uncommitted_replies_lock);
1353         spin_lock (&exp->exp_lock);
1354
1355         list_add_tail (&rs->rs_exp_list, &exp->exp_outstanding_replies);
1356
1357         spin_unlock_irqrestore (&exp->exp_lock, flags);
1358
1359         netrc = target_send_reply_msg (req, rc, fail_id);
1360
1361         spin_lock_irqsave (&svc->srv_lock, flags);
1362
1363         svc->srv_n_difficult_replies++;
1364
1365         if (netrc != 0) /* error sending: reply is off the net */
1366                 rs->rs_on_net = 0;
1367
1368         if (!rs->rs_on_net ||                   /* some notifier */
1369             list_empty(&rs->rs_exp_list) ||     /* completed already */
1370             list_empty(&rs->rs_obd_list)) {
1371                 list_add_tail (&rs->rs_list, &svc->srv_reply_queue);
1372                 wake_up (&svc->srv_waitq);
1373         } else {
1374                 list_add (&rs->rs_list, &sni->sni_active_replies);
1375                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
1376         }
1377
1378         spin_unlock_irqrestore (&svc->srv_lock, flags);
1379 }
1380
1381 int target_handle_ping(struct ptlrpc_request *req)
1382 {
1383         return lustre_pack_reply(req, 0, NULL, NULL);
1384 }