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
  40 /* @priority: if non-zero, move the selected to the list head
  41  * @create: if zero, only search in existed connections
  42  */
  43 static int import_set_conn(struct obd_import *imp, struct obd_uuid *uuid,
  44                            int priority, int create)
  45 {
  46         struct ptlrpc_connection *ptlrpc_conn;
  47         struct obd_import_conn *imp_conn = NULL, *item;
  48         int rc = 0;
  49         ENTRY;
  50
  51         if (!create && !priority) {
  52                 CDEBUG(D_HA, "Nothing to do\n");
  53                 RETURN(-EINVAL);
  54         }
  55
  56         ptlrpc_conn = ptlrpc_uuid_to_connection(uuid);
  57         if (!ptlrpc_conn) {
  58                 CDEBUG(D_HA, "can't find connection %s\n", uuid->uuid);
  59                 RETURN (-ENOENT);
  60         }
  61
  62         if (create) {
  63                 OBD_ALLOC(imp_conn, sizeof(*imp_conn));
  64                 if (!imp_conn) {
  65                         GOTO(out_put, rc = -ENOMEM);
  66                 }
  67         }
  68
  69         spin_lock(&imp->imp_lock);
  70         list_for_each_entry(item, &imp->imp_conn_list, oic_item) {
  71                 if (obd_uuid_equals(uuid, &item->oic_uuid)) {
  72                         if (priority) {
  73                                 list_del(&item->oic_item);
  74                                 list_add(&item->oic_item, &imp->imp_conn_list);
  75                                 item->oic_last_attempt = 0;
  76                         }
  77                         CDEBUG(D_HA, "imp %p@%s: found existing conn %s%s\n",
  78                                imp, imp->imp_obd->obd_name, uuid->uuid,
  79                                (priority ? ", moved to head" : ""));
  80                         spin_unlock(&imp->imp_lock);
  81                         GOTO(out_free, rc = 0);
  82                 }
  83         }
  84         /* not found */
  85         if (create) {
  86                 imp_conn->oic_conn = ptlrpc_conn;
  87                 imp_conn->oic_uuid = *uuid;
  88                 item->oic_last_attempt = 0;
  89                 if (priority)
  90                         list_add(&imp_conn->oic_item, &imp->imp_conn_list);
  91                 else
  92                         list_add_tail(&imp_conn->oic_item, &imp->imp_conn_list);
  93                 CDEBUG(D_HA, "imp %p@%s: add connection %s at %s\n",
  94                        imp, imp->imp_obd->obd_name, uuid->uuid,
  95                        (priority ? "head" : "tail"));
  96         } else {
  97                 spin_unlock(&imp->imp_lock);
  98                 GOTO(out_free, rc = -ENOENT);
  99
 100         }
 101
 102         spin_unlock(&imp->imp_lock);
 103         RETURN(0);
 104 out_free:
 105         if (imp_conn)
 106                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 107 out_put:
 108         ptlrpc_put_connection(ptlrpc_conn);
 109         RETURN(rc);
 110 }
 111
 112 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid)
 113 {
 114         return import_set_conn(imp, uuid, 1, 0);
 115 }
 116
 117 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
 118                            int priority)
 119 {
 120         return import_set_conn(imp, uuid, priority, 1);
 121 }
 122
 123 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid)
 124 {
 125         struct obd_import_conn *imp_conn;
 126         struct obd_export *dlmexp;
 127         int rc = -ENOENT;
 128         ENTRY;
 129
 130         spin_lock(&imp->imp_lock);
 131         if (list_empty(&imp->imp_conn_list)) {
 132                 LASSERT(!imp->imp_connection);
 133                 GOTO(out, rc);
 134         }
 135
 136         list_for_each_entry(imp_conn, &imp->imp_conn_list, oic_item) {
 137                 if (!obd_uuid_equals(uuid, &imp_conn->oic_uuid))
 138                         continue;
 139                 LASSERT(imp_conn->oic_conn);
 140
 141                 /* is current conn? */
 142                 if (imp_conn == imp->imp_conn_current) {
 143                         LASSERT(imp_conn->oic_conn == imp->imp_connection);
 144
 145                         if (imp->imp_state != LUSTRE_IMP_CLOSED &&
 146                             imp->imp_state != LUSTRE_IMP_DISCON) {
 147                                 CERROR("can't remove current connection\n");
 148                                 GOTO(out, rc = -EBUSY);
 149                         }
 150
 151                         ptlrpc_put_connection(imp->imp_connection);
 152                         imp->imp_connection = NULL;
 153
 154                         dlmexp = class_conn2export(&imp->imp_dlm_handle);
 155                         if (dlmexp && dlmexp->exp_connection) {
 156                                 LASSERT(dlmexp->exp_connection ==
 157                                         imp_conn->oic_conn);
 158                                 ptlrpc_put_connection(dlmexp->exp_connection);
 159                                 dlmexp->exp_connection = NULL;
 160                         }
 161                 }
 162
 163                 list_del(&imp_conn->oic_item);
 164                 ptlrpc_put_connection(imp_conn->oic_conn);
 165                 OBD_FREE(imp_conn, sizeof(*imp_conn));
 166                 CDEBUG(D_HA, "imp %p@%s: remove connection %s\n",
 167                        imp, imp->imp_obd->obd_name, uuid->uuid);
 168                 rc = 0;
 169                 break;
 170         }
 171 out:
 172         spin_unlock(&imp->imp_lock);
 173         if (rc == -ENOENT)
 174                 CERROR("connection %s not found\n", uuid->uuid);
 175         RETURN(rc);
 176 }
 177
 178 /* configure an RPC client OBD device
 179  *
 180  * lcfg parameters:
 181  * 1 - client UUID
 182  * 2 - server UUID
 183  * 3 - inactive-on-startup
 184  */
 185 int client_obd_setup(struct obd_device *obddev, obd_count len, void *buf)
 186 {
 187         struct lustre_cfg* lcfg = buf;
 188         struct client_obd *cli = &obddev->u.cli;
 189         struct obd_import *imp;
 190         struct obd_uuid server_uuid;
 191         int rq_portal, rp_portal, connect_op;
 192         char *name = obddev->obd_type->typ_name;
 193         int rc;
 194         ENTRY;
 195
 196         /* In a more perfect world, we would hang a ptlrpc_client off of
 197          * obd_type and just use the values from there. */
 198         if (!strcmp(name, LUSTRE_OSC_NAME)) {
 199 #ifdef __KERNEL__
 200                 /* Can be removed in Lustre 1.8, for compatibility only */
 201                 rq_portal = OST_IO_PORTAL;
 202 #else
 203                 rq_portal = OST_REQUEST_PORTAL;
 204 #endif
 205                 rp_portal = OSC_REPLY_PORTAL;
 206                 connect_op = OST_CONNECT;
 207         } else if (!strcmp(name, LUSTRE_MDC_NAME)) {
 208                 rq_portal = MDS_REQUEST_PORTAL;
 209                 rp_portal = MDC_REPLY_PORTAL;
 210                 connect_op = MDS_CONNECT;
 211         } else if (!strcmp(name, LUSTRE_MGC_NAME)) {
 212                 rq_portal = MGS_REQUEST_PORTAL;
 213                 rp_portal = MGC_REPLY_PORTAL;
 214                 connect_op = MGS_CONNECT;
 215         } else {
 216                 CERROR("unknown client OBD type \"%s\", can't setup\n",
 217                        name);
 218                 RETURN(-EINVAL);
 219         }
 220
 221         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
 222                 CERROR("requires a TARGET UUID\n");
 223                 RETURN(-EINVAL);
 224         }
 225
 226         if (LUSTRE_CFG_BUFLEN(lcfg, 1) > 37) {
 227                 CERROR("client UUID must be less than 38 characters\n");
 228                 RETURN(-EINVAL);
 229         }
 230
 231         if (LUSTRE_CFG_BUFLEN(lcfg, 2) < 1) {
 232                 CERROR("setup requires a SERVER UUID\n");
 233                 RETURN(-EINVAL);
 234         }
 235
 236         if (LUSTRE_CFG_BUFLEN(lcfg, 2) > 37) {
 237                 CERROR("target UUID must be less than 38 characters\n");
 238                 RETURN(-EINVAL);
 239         }
 240
 241         sema_init(&cli->cl_sem, 1);
 242         sema_init(&cli->cl_mgc_sem, 1);
 243         cli->cl_conn_count = 0;
 244         memcpy(server_uuid.uuid, lustre_cfg_buf(lcfg, 2),
 245                min_t(unsigned int, LUSTRE_CFG_BUFLEN(lcfg, 2),
 246                      sizeof(server_uuid)));
 247
 248         cli->cl_dirty = 0;
 249         cli->cl_avail_grant = 0;
 250         /* FIXME: should limit this for the sum of all cl_dirty_max */
 251         cli->cl_dirty_max = OSC_MAX_DIRTY_DEFAULT * 1024 * 1024;
 252         if (cli->cl_dirty_max >> CFS_PAGE_SHIFT > num_physpages / 8)
 253                 cli->cl_dirty_max = num_physpages << (CFS_PAGE_SHIFT - 3);
 254         CFS_INIT_LIST_HEAD(&cli->cl_cache_waiters);
 255         CFS_INIT_LIST_HEAD(&cli->cl_loi_ready_list);
 256         CFS_INIT_LIST_HEAD(&cli->cl_loi_write_list);
 257         CFS_INIT_LIST_HEAD(&cli->cl_loi_read_list);
 258         client_obd_list_lock_init(&cli->cl_loi_list_lock);
 259         cli->cl_r_in_flight = 0;
 260         cli->cl_w_in_flight = 0;
 261         spin_lock_init(&cli->cl_read_rpc_hist.oh_lock);
 262         spin_lock_init(&cli->cl_write_rpc_hist.oh_lock);
 263         spin_lock_init(&cli->cl_read_page_hist.oh_lock);
 264         spin_lock_init(&cli->cl_write_page_hist.oh_lock);
 265         spin_lock_init(&cli->cl_read_offset_hist.oh_lock);
 266         spin_lock_init(&cli->cl_write_offset_hist.oh_lock);
 267
 268         /* This value may be changed at connect time in
 269            ptlrpc_connect_interpret. */
 270         cli->cl_max_pages_per_rpc = min((int)PTLRPC_MAX_BRW_PAGES,
 271                                         (int)(1024 * 1024 >> CFS_PAGE_SHIFT));
 272
 273         if (!strcmp(name, LUSTRE_MDC_NAME)) {
 274                 cli->cl_max_rpcs_in_flight = MDC_MAX_RIF_DEFAULT;
 275         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 128 /* MB */) {
 276                 cli->cl_max_rpcs_in_flight = 2;
 277         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 256 /* MB */) {
 278                 cli->cl_max_rpcs_in_flight = 3;
 279         } else if (num_physpages >> (20 - CFS_PAGE_SHIFT) <= 512 /* MB */) {
 280                 cli->cl_max_rpcs_in_flight = 4;
 281         } else {
 282                 cli->cl_max_rpcs_in_flight = OSC_MAX_RIF_DEFAULT;
 283         }
 284         rc = ldlm_get_ref();
 285         if (rc) {
 286                 CERROR("ldlm_get_ref failed: %d\n", rc);
 287                 GOTO(err, rc);
 288         }
 289
 290         ptlrpc_init_client(rq_portal, rp_portal, name,
 291                            &obddev->obd_ldlm_client);
 292
 293         imp = class_new_import(obddev);
 294         if (imp == NULL)
 295                 GOTO(err_ldlm, rc = -ENOENT);
 296         imp->imp_client = &obddev->obd_ldlm_client;
 297         imp->imp_connect_op = connect_op;
 298         imp->imp_initial_recov = 1;
 299         imp->imp_initial_recov_bk = 0;
 300         CFS_INIT_LIST_HEAD(&imp->imp_pinger_chain);
 301         memcpy(cli->cl_target_uuid.uuid, lustre_cfg_buf(lcfg, 1),
 302                LUSTRE_CFG_BUFLEN(lcfg, 1));
 303         class_import_put(imp);
 304
 305         rc = client_import_add_conn(imp, &server_uuid, 1);
 306         if (rc) {
 307                 CERROR("can't add initial connection\n");
 308                 GOTO(err_import, rc);
 309         }
 310
 311         cli->cl_import = imp;
 312         /* cli->cl_max_mds_{easize,cookiesize} updated by mdc_init_ea_size() */
 313         cli->cl_max_mds_easize = sizeof(struct lov_mds_md);
 314         cli->cl_max_mds_cookiesize = sizeof(struct llog_cookie);
 315
 316         if (LUSTRE_CFG_BUFLEN(lcfg, 3) > 0) {
 317                 if (!strcmp(lustre_cfg_string(lcfg, 3), "inactive")) {
 318                         CDEBUG(D_HA, "marking %s %s->%s as inactive\n",
 319                                name, obddev->obd_name,
 320                                cli->cl_target_uuid.uuid);
 321                         imp->imp_invalid = 1;
 322                 }
 323         }
 324
 325         cli->cl_qchk_stat = CL_NOT_QUOTACHECKED;
 326
 327         RETURN(rc);
 328
 329 err_import:
 330         class_destroy_import(imp);
 331 err_ldlm:
 332         ldlm_put_ref(0);
 333 err:
 334         RETURN(rc);
 335
 336 }
 337
 338 int client_obd_cleanup(struct obd_device *obddev)
 339 {
 340         ENTRY;
 341         ldlm_put_ref(obddev->obd_force);
 342
 343         RETURN(0);
 344 }
 345
 346 /* ->o_connect() method for client side (OSC and MDC and MGC) */
 347 int client_connect_import(struct lustre_handle *dlm_handle,
 348                           struct obd_device *obd, struct obd_uuid *cluuid,
 349                           struct obd_connect_data *data)
 350 {
 351         struct client_obd *cli = &obd->u.cli;
 352         struct obd_import *imp = cli->cl_import;
 353         struct obd_export *exp;
 354         struct obd_connect_data *ocd;
 355         int rc;
 356         ENTRY;
 357
 358         mutex_down(&cli->cl_sem);
 359         rc = class_connect(dlm_handle, obd, cluuid);
 360         if (rc)
 361                 GOTO(out_sem, rc);
 362
 363         cli->cl_conn_count++;
 364         if (cli->cl_conn_count > 1)
 365                 GOTO(out_sem, rc);
 366         exp = class_conn2export(dlm_handle);
 367
 368         if (obd->obd_namespace != NULL)
 369                 CERROR("already have namespace!\n");
 370         obd->obd_namespace = ldlm_namespace_new(obd->obd_name,
 371                                                 LDLM_NAMESPACE_CLIENT);
 372         if (obd->obd_namespace == NULL)
 373                 GOTO(out_disco, rc = -ENOMEM);
 374
 375         imp->imp_dlm_handle = *dlm_handle;
 376         rc = ptlrpc_init_import(imp);
 377         if (rc != 0)
 378                 GOTO(out_ldlm, rc);
 379
 380         ocd = &imp->imp_connect_data;
 381         if (data) {
 382                 *ocd = *data;
 383                 imp->imp_connect_flags_orig = data->ocd_connect_flags;
 384         }
 385
 386         rc = ptlrpc_connect_import(imp, NULL);
 387         if (rc != 0) {
 388                 LASSERT (imp->imp_state == LUSTRE_IMP_DISCON);
 389                 GOTO(out_ldlm, rc);
 390         }
 391         LASSERT(exp->exp_connection);
 392
 393         if (data) {
 394                 LASSERT((ocd->ocd_connect_flags & data->ocd_connect_flags) ==
 395                         ocd->ocd_connect_flags);
 396                 data->ocd_connect_flags = ocd->ocd_connect_flags;
 397         }
 398
 399         ptlrpc_pinger_add_import(imp);
 400         EXIT;
 401
 402         if (rc) {
 403 out_ldlm:
 404                 ldlm_namespace_free(obd->obd_namespace, 0);
 405                 obd->obd_namespace = NULL;
 406 out_disco:
 407                 cli->cl_conn_count--;
 408                 class_disconnect(exp);
 409         } else {
 410                 class_export_put(exp);
 411         }
 412 out_sem:
 413         mutex_up(&cli->cl_sem);
 414         return rc;
 415 }
 416
 417 int client_disconnect_export(struct obd_export *exp)
 418 {
 419         struct obd_device *obd = class_exp2obd(exp);
 420         struct client_obd *cli;
 421         struct obd_import *imp;
 422         int rc = 0, err;
 423         ENTRY;
 424
 425         if (!obd) {
 426                 CERROR("invalid export for disconnect: exp %p cookie "LPX64"\n",
 427                        exp, exp ? exp->exp_handle.h_cookie : -1);
 428                 RETURN(-EINVAL);
 429         }
 430
 431         cli = &obd->u.cli;
 432         imp = cli->cl_import;
 433
 434         mutex_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         /* Mark import deactivated now, so we don't try to reconnect if any
 446          * of the cleanup RPCs fails (e.g. ldlm cancel, etc).  We don't
 447          * fully deactivate the import, or that would drop all requests. */
 448         imp->imp_deactive = 1;
 449
 450         /* Some non-replayable imports (MDS's OSCs) are pinged, so just
 451          * delete it regardless.  (It's safe to delete an import that was
 452          * never added.) */
 453         (void)ptlrpc_pinger_del_import(imp);
 454
 455         if (obd->obd_namespace != NULL) {
 456                 /* obd_no_recov == local only */
 457                 ldlm_cli_cancel_unused(obd->obd_namespace, NULL,
 458                                        obd->obd_no_recov ? LDLM_FL_LOCAL_ONLY:0,
 459                                        NULL);
 460                 ldlm_namespace_free(obd->obd_namespace, obd->obd_no_recov);
 461                 obd->obd_namespace = NULL;
 462         }
 463
 464         /* Yeah, obd_no_recov also (mainly) means "forced shutdown". */
 465         if (!obd->obd_no_recov)
 466                 rc = ptlrpc_disconnect_import(imp, 0);
 467
 468         ptlrpc_invalidate_import(imp);
 469         ptlrpc_free_rq_pool(imp->imp_rq_pool);
 470         class_destroy_import(imp);
 471         cli->cl_import = NULL;
 472
 473         EXIT;
 474  out_no_disconnect:
 475         err = class_disconnect(exp);
 476         if (!rc && err)
 477                 rc = err;
 478  out_sem:
 479         mutex_up(&cli->cl_sem);
 480         RETURN(rc);
 481 }
 482
 483 /* --------------------------------------------------------------------------
 484  * from old lib/target.c
 485  * -------------------------------------------------------------------------- */
 486
 487 int target_handle_reconnect(struct lustre_handle *conn, struct obd_export *exp,
 488                             struct obd_uuid *cluuid)
 489 {
 490         ENTRY;
 491         if (exp->exp_connection && exp->exp_imp_reverse) {
 492                 struct lustre_handle *hdl;
 493                 hdl = &exp->exp_imp_reverse->imp_remote_handle;
 494                 /* Might be a re-connect after a partition. */
 495                 if (!memcmp(&conn->cookie, &hdl->cookie, sizeof conn->cookie)) {
 496                         CWARN("%s: %s reconnecting\n", exp->exp_obd->obd_name,
 497                               cluuid->uuid);
 498                         conn->cookie = exp->exp_handle.h_cookie;
 499                         /* target_handle_connect() treats EALREADY and
 500                          * -EALREADY differently.  EALREADY means we are
 501                          * doing a valid reconnect from the same client. */
 502                         RETURN(EALREADY);
 503                 } else {
 504                         CERROR("%s reconnecting from %s, "
 505                                "handle mismatch (ours "LPX64", theirs "
 506                                LPX64")\n", cluuid->uuid,
 507                                exp->exp_connection->c_remote_uuid.uuid,
 508                                hdl->cookie, conn->cookie);
 509                         memset(conn, 0, sizeof *conn);
 510                         /* target_handle_connect() treats EALREADY and
 511                          * -EALREADY differently.  -EALREADY is an error
 512                          * (same UUID, different handle). */
 513                         RETURN(-EALREADY);
 514                 }
 515         }
 516
 517         conn->cookie = exp->exp_handle.h_cookie;
 518         CDEBUG(D_HA, "connect export for UUID '%s' at %p, cookie "LPX64"\n",
 519                cluuid->uuid, exp, conn->cookie);
 520         RETURN(0);
 521 }
 522
 523 void target_client_add_cb(struct obd_device *obd, __u64 transno, void *cb_data,
 524                           int error)
 525 {
 526         struct obd_export *exp = cb_data;
 527
 528         CDEBUG(D_HA, "%s: committing for initial connect of %s\n",
 529                obd->obd_name, exp->exp_client_uuid.uuid);
 530         exp->exp_need_sync = 0;
 531 }
 532 EXPORT_SYMBOL(target_client_add_cb);
 533
 534 int target_handle_connect(struct ptlrpc_request *req, svc_handler_t handler)
 535 {
 536         struct obd_device *target, *targref = NULL;
 537         struct obd_export *export = NULL;
 538         struct obd_import *revimp;
 539         struct lustre_handle conn;
 540         struct obd_uuid tgtuuid;
 541         struct obd_uuid cluuid;
 542         struct obd_uuid remote_uuid;
 543         char *str, *tmp;
 544         int rc = 0, abort_recovery;
 545         struct obd_connect_data *data;
 546         int size[2] = { sizeof(struct ptlrpc_body), sizeof(*data) };
 547         ENTRY;
 548
 549         OBD_RACE(OBD_FAIL_TGT_CONN_RACE);
 550
 551         LASSERT_REQSWAB(req, REQ_REC_OFF);
 552         str = lustre_msg_string(req->rq_reqmsg, REQ_REC_OFF, sizeof(tgtuuid)-1);
 553         if (str == NULL) {
 554                 DEBUG_REQ(D_ERROR, req, "bad target UUID for connect\n");
 555                 GOTO(out, rc = -EINVAL);
 556         }
 557
 558         obd_str2uuid (&tgtuuid, str);
 559         target = class_uuid2obd(&tgtuuid);
 560         /* COMPAT_146 */
 561         /* old (pre 1.6) lustre_process_log tries to connect to mdsname
 562            (eg. mdsA) instead of uuid. */
 563         if (!target) {
 564                 snprintf((char *)tgtuuid.uuid, sizeof(tgtuuid), "%s_UUID", str);
 565                 target = class_uuid2obd(&tgtuuid);
 566         }
 567         if (!target)
 568                 target = class_name2obd(str);
 569         /* end COMPAT_146 */
 570
 571         if (!target || target->obd_stopping || !target->obd_set_up) {
 572                 LCONSOLE_ERROR("UUID '%s' is not available "
 573                                " for connect (%s)\n", str,
 574                                !target ? "no target" :
 575                                (target->obd_stopping ? "stopping" :
 576                                 "not set up"));
 577                 GOTO(out, rc = -ENODEV);
 578         }
 579
 580         if (target->obd_no_conn) {
 581                 LCONSOLE_WARN("%s: temporarily refusing client connection "
 582                               "from %s\n", target->obd_name,
 583                               libcfs_nid2str(req->rq_peer.nid));
 584                 GOTO(out, rc = -EAGAIN);
 585         }
 586
 587         /* Make sure the target isn't cleaned up while we're here. Yes,
 588            there's still a race between the above check and our incref here.
 589            Really, class_uuid2obd should take the ref. */
 590         targref = class_incref(target);
 591
 592         LASSERT_REQSWAB(req, REQ_REC_OFF + 1);
 593         str = lustre_msg_string(req->rq_reqmsg, REQ_REC_OFF + 1,
 594                                 sizeof(cluuid) - 1);
 595         if (str == NULL) {
 596                 DEBUG_REQ(D_ERROR, req, "bad client UUID for connect\n");
 597                 GOTO(out, rc = -EINVAL);
 598         }
 599
 600         obd_str2uuid (&cluuid, str);
 601
 602         /* XXX extract a nettype and format accordingly */
 603         switch (sizeof(lnet_nid_t)) {
 604                 /* NB the casts only avoid compiler warnings */
 605         case 8:
 606                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 607                          "NET_"LPX64"_UUID", (__u64)req->rq_peer.nid);
 608                 break;
 609         case 4:
 610                 snprintf(remote_uuid.uuid, sizeof remote_uuid,
 611                          "NET_%x_UUID", (__u32)req->rq_peer.nid);
 612                 break;
 613         default:
 614                 LBUG();
 615         }
 616
 617         spin_lock_bh(&target->obd_processing_task_lock);
 618         abort_recovery = target->obd_abort_recovery;
 619         spin_unlock_bh(&target->obd_processing_task_lock);
 620         if (abort_recovery)
 621                 target_abort_recovery(target);
 622
 623         tmp = lustre_msg_buf(req->rq_reqmsg, REQ_REC_OFF + 2, sizeof conn);
 624         if (tmp == NULL)
 625                 GOTO(out, rc = -EPROTO);
 626
 627         memcpy(&conn, tmp, sizeof conn);
 628
 629         data = lustre_swab_reqbuf(req, REQ_REC_OFF + 3, sizeof(*data),
 630                                   lustre_swab_connect);
 631         rc = lustre_pack_reply(req, 2, size, NULL);
 632         if (rc)
 633                 GOTO(out, rc);
 634
 635         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 636                 if (!data) {
 637                         DEBUG_REQ(D_WARNING, req, "Refusing old (unversioned) "
 638                                   "libclient connection attempt\n");
 639                         GOTO(out, rc = -EPROTO);
 640                 } else if (data->ocd_version < LUSTRE_VERSION_CODE -
 641                                                LUSTRE_VERSION_ALLOWED_OFFSET ||
 642                            data->ocd_version > LUSTRE_VERSION_CODE +
 643                                                LUSTRE_VERSION_ALLOWED_OFFSET) {
 644                         DEBUG_REQ(D_WARNING, req, "Refusing %s (%d.%d.%d.%d) "
 645                                   "libclient connection attempt\n",
 646                                   data->ocd_version < LUSTRE_VERSION_CODE ?
 647                                   "old" : "new",
 648                                   OBD_OCD_VERSION_MAJOR(data->ocd_version),
 649                                   OBD_OCD_VERSION_MINOR(data->ocd_version),
 650                                   OBD_OCD_VERSION_PATCH(data->ocd_version),
 651                                   OBD_OCD_VERSION_FIX(data->ocd_version));
 652                         data = lustre_msg_buf(req->rq_repmsg, REPLY_REC_OFF,
 653                                               offsetof(typeof(*data),
 654                                                        ocd_version) +
 655                                               sizeof(data->ocd_version));
 656                         if (data) {
 657                                 data->ocd_connect_flags = OBD_CONNECT_VERSION;
 658                                 data->ocd_version = LUSTRE_VERSION_CODE;
 659                         }
 660                         GOTO(out, rc = -EPROTO);
 661                 }
 662         }
 663
 664         /* lctl gets a backstage, all-access pass. */
 665         if (obd_uuid_equals(&cluuid, &target->obd_uuid))
 666                 goto dont_check_exports;
 667
 668         spin_lock(&target->obd_dev_lock);
 669         export = lustre_hash_get_object_by_key(target->obd_uuid_hash_body, &cluuid);
 670
 671         if (export != NULL && export->exp_connecting) { /* bug 9635, et. al. */
 672                 CWARN("%s: exp %p already connecting\n",
 673                       export->exp_obd->obd_name, export);
 674                 class_export_put(export);
 675                 export = NULL;
 676                 rc = -EALREADY;
 677         } else if (export != NULL) {
 678                 /* make darn sure this is coming from the same peer
 679                  * if the UUIDs matched */
 680               if ((export->exp_connection != NULL) &&
 681                   (strcmp(libcfs_nid2str(req->rq_peer.nid),
 682                           libcfs_nid2str(export->exp_connection->c_peer.nid)))) {
 683                           CWARN("%s: cookie %s seen on new NID %s when "
 684                                   "existing NID %s is already connected\n",
 685                           target->obd_name, cluuid.uuid,
 686                           libcfs_nid2str(req->rq_peer.nid),
 687                           libcfs_nid2str(export->exp_connection->c_peer.nid));
 688                           class_export_put(export);
 689                           export = NULL;
 690                           rc = -EALREADY;
 691                 } else {
 692                                 export->exp_connecting = 1;
 693                                 class_export_put(export);
 694                                 spin_unlock(&target->obd_dev_lock);
 695                                 LASSERT(export->exp_obd == target);
 696                                 rc = target_handle_reconnect(&conn, export, &cluuid);
 697                 }
 698         }
 699
 700         /* If we found an export, we already unlocked. */
 701         if (!export) {
 702                 spin_unlock(&target->obd_dev_lock);
 703                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_CONNECT, 2 * obd_timeout);
 704         } else if (req->rq_export == NULL &&
 705                    atomic_read(&export->exp_rpc_count) > 0) {
 706                 CWARN("%s: refuse connection from %s/%s to 0x%p/%d\n",
 707                       target->obd_name, cluuid.uuid,
 708                       libcfs_nid2str(req->rq_peer.nid),
 709                       export, atomic_read(&export->exp_refcount));
 710                 GOTO(out, rc = -EBUSY);
 711         } else if (req->rq_export != NULL &&
 712                    atomic_read(&export->exp_rpc_count) > 1) {
 713                 CWARN("%s: refuse reconnection from %s@%s to 0x%p/%d\n",
 714                       target->obd_name, cluuid.uuid,
 715                       libcfs_nid2str(req->rq_peer.nid),
 716                       export, atomic_read(&export->exp_rpc_count));
 717                 GOTO(out, rc = -EBUSY);
 718         } else if (lustre_msg_get_conn_cnt(req->rq_reqmsg) == 1) {
 719                 CERROR("%s: NID %s (%s) reconnected with 1 conn_cnt; "
 720                        "cookies not random?\n", target->obd_name,
 721                        libcfs_nid2str(req->rq_peer.nid), cluuid.uuid);
 722                 GOTO(out, rc = -EALREADY);
 723         } else {
 724                 OBD_FAIL_TIMEOUT(OBD_FAIL_TGT_DELAY_RECONNECT, 2 * obd_timeout);
 725         }
 726
 727         /* We want to handle EALREADY but *not* -EALREADY from
 728          * target_handle_reconnect(), return reconnection state in a flag */
 729         if (rc == EALREADY) {
 730                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECONNECT);
 731                 rc = 0;
 732         } else if (rc) {
 733                 GOTO(out, rc);
 734         }
 735
 736         /* Tell the client if we're in recovery. */
 737         /* If this is the first client, start the recovery timer */
 738         if (target->obd_recovering) {
 739                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_RECOVERING);
 740                 target_start_recovery_timer(target, handler);
 741         }
 742
 743         /* Tell the client if we support replayable requests */
 744         if (target->obd_replayable)
 745                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_REPLAYABLE);
 746
 747         if (export == NULL) {
 748                 if (target->obd_recovering) {
 749                         CERROR("%s: denying connection for new client %s (%s): "
 750                                "%d clients in recovery for %lds\n",
 751                                target->obd_name,
 752                                libcfs_nid2str(req->rq_peer.nid), cluuid.uuid,
 753                                target->obd_recoverable_clients,
 754                                cfs_duration_sec(cfs_time_sub(cfs_timer_deadline(&target->obd_recovery_timer),
 755                                                              cfs_time_current())));
 756                         rc = -EBUSY;
 757                 } else {
 758  dont_check_exports:
 759                         rc = obd_connect(&conn, target, &cluuid, data);
 760                 }
 761         } else {
 762                 rc = obd_reconnect(export, target, &cluuid, data);
 763         }
 764
 765         if (rc)
 766                 GOTO(out, rc);
 767
 768         /* Return only the parts of obd_connect_data that we understand, so the
 769          * client knows that we don't understand the rest. */
 770         if (data)
 771                 memcpy(lustre_msg_buf(req->rq_repmsg, REPLY_REC_OFF,
 772                                       sizeof(*data)),
 773                        data, sizeof(*data));
 774
 775         /* If all else goes well, this is our RPC return code. */
 776         req->rq_status = 0;
 777
 778         lustre_msg_set_handle(req->rq_repmsg, &conn);
 779
 780         /* ownership of this export ref transfers to the request AFTER we
 781          * drop any previous reference the request had, but we don't want
 782          * that to go to zero before we get our new export reference. */
 783         export = class_conn2export(&conn);
 784         if (!export) {
 785                 DEBUG_REQ(D_ERROR, req, "Missing export!\n");
 786                 GOTO(out, rc = -ENODEV);
 787         }
 788
 789         /* If the client and the server are the same node, we will already
 790          * have an export that really points to the client's DLM export,
 791          * because we have a shared handles table.
 792          *
 793          * XXX this will go away when shaver stops sending the "connect" handle
 794          * in the real "remote handle" field of the request --phik 24 Apr 2003
 795          */
 796         if (req->rq_export != NULL)
 797                 class_export_put(req->rq_export);
 798
 799         req->rq_export = export;
 800
 801         spin_lock(&export->exp_lock);
 802         if (export->exp_conn_cnt >= lustre_msg_get_conn_cnt(req->rq_reqmsg)) {
 803                 CERROR("%s: %s already connected at higher conn_cnt: %d > %d\n",
 804                        cluuid.uuid, libcfs_nid2str(req->rq_peer.nid),
 805                        export->exp_conn_cnt,
 806                        lustre_msg_get_conn_cnt(req->rq_reqmsg));
 807
 808                 spin_unlock(&export->exp_lock);
 809                 GOTO(out, rc = -EALREADY);
 810         }
 811         export->exp_conn_cnt = lustre_msg_get_conn_cnt(req->rq_reqmsg);
 812         spin_unlock(&export->exp_lock);
 813
 814         /* request from liblustre?  Don't evict it for not pinging. */
 815         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_LIBCLIENT) {
 816                 export->exp_libclient = 1;
 817                 spin_lock(&target->obd_dev_lock);
 818                 list_del_init(&export->exp_obd_chain_timed);
 819                 spin_unlock(&target->obd_dev_lock);
 820         }
 821
 822         if (export->exp_connection != NULL)
 823                 ptlrpc_put_connection(export->exp_connection);
 824         export->exp_connection = ptlrpc_get_connection(req->rq_peer,
 825                                                        req->rq_self,
 826                                                        &remote_uuid);
 827
 828         spin_lock(&target->obd_dev_lock);
 829         lustre_hash_additem(export->exp_obd->obd_nid_hash_body,
 830                             &export->exp_connection->c_peer.nid,
 831                             &export->exp_nid_hash);
 832         spin_unlock(&target->obd_dev_lock);
 833
 834         if (lustre_msg_get_op_flags(req->rq_repmsg) & MSG_CONNECT_RECONNECT)
 835                 GOTO(out, rc = 0);
 836
 837         if (target->obd_recovering)
 838                 target->obd_connected_clients++;
 839
 840         memcpy(&conn,
 841                lustre_msg_buf(req->rq_reqmsg, REQ_REC_OFF + 2, sizeof conn),
 842                sizeof conn);
 843
 844         if (export->exp_imp_reverse != NULL)
 845                 class_destroy_import(export->exp_imp_reverse);
 846         revimp = export->exp_imp_reverse = class_new_import(target);
 847         revimp->imp_connection = ptlrpc_connection_addref(export->exp_connection);
 848         revimp->imp_client = &export->exp_obd->obd_ldlm_client;
 849         revimp->imp_remote_handle = conn;
 850         revimp->imp_dlm_fake = 1;
 851         revimp->imp_state = LUSTRE_IMP_FULL;
 852
 853         if (lustre_msg_get_op_flags(req->rq_reqmsg) & MSG_CONNECT_NEXT_VER) {
 854                 revimp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2;
 855                 lustre_msg_add_op_flags(req->rq_repmsg, MSG_CONNECT_NEXT_VER);
 856         }
 857
 858         class_import_put(revimp);
 859 out:
 860         if (export)
 861                 export->exp_connecting = 0;
 862         if (targref)
 863                 class_decref(targref);
 864         if (rc)
 865                 req->rq_status = rc;
 866         RETURN(rc);
 867 }
 868
 869 int target_handle_disconnect(struct ptlrpc_request *req)
 870 {
 871         int rc;
 872         ENTRY;
 873
 874         rc = lustre_pack_reply(req, 1, NULL, NULL);
 875         if (rc)
 876                 RETURN(rc);
 877
 878         /* keep the rq_export around so we can send the reply */
 879         req->rq_status = obd_disconnect(class_export_get(req->rq_export));
 880         RETURN(0);
 881 }
 882
 883 void target_destroy_export(struct obd_export *exp)
 884 {
 885         /* exports created from last_rcvd data, and "fake"
 886            exports created by lctl don't have an import */
 887         if (exp->exp_imp_reverse != NULL)
 888                 class_destroy_import(exp->exp_imp_reverse);
 889
 890         /* We cancel locks at disconnect time, but this will catch any locks
 891          * granted in a race with recovery-induced disconnect. */
 892         if (exp->exp_obd->obd_namespace != NULL)
 893                 ldlm_cancel_locks_for_export(exp);
 894 }
 895
 896 /*
 897  * Recovery functions
 898  */
 899
 900
 901 static void target_release_saved_req(struct ptlrpc_request *req)
 902 {
 903         if (req->rq_reply_state != NULL) {
 904                 ptlrpc_rs_decref(req->rq_reply_state);
 905                 /* req->rq_reply_state = NULL; */
 906         }
 907
 908         class_export_put(req->rq_export);
 909         OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
 910         OBD_FREE(req, sizeof *req);
 911 }
 912
 913 static void target_finish_recovery(struct obd_device *obd)
 914 {
 915         struct list_head *tmp, *n;
 916
 917         LCONSOLE_INFO("%s: sending delayed replies to recovered clients\n",
 918                       obd->obd_name);
 919
 920         ldlm_reprocess_all_ns(obd->obd_namespace);
 921
 922         /* when recovery finished, cleanup orphans on mds and ost */
 923         if (OBT(obd) && OBP(obd, postrecov)) {
 924                 int rc = OBP(obd, postrecov)(obd);
 925                 LCONSOLE_WARN("%s: recovery %s: rc %d\n", obd->obd_name,
 926                               rc < 0 ? "failed" : "complete", rc);
 927         }
 928
 929         list_for_each_safe(tmp, n, &obd->obd_delayed_reply_queue) {
 930                 struct ptlrpc_request *req;
 931                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 932                 list_del(&req->rq_list);
 933                 DEBUG_REQ(D_HA, req, "delayed:");
 934                 ptlrpc_reply(req);
 935                 target_release_saved_req(req);
 936         }
 937         obd->obd_recovery_end = CURRENT_SECONDS;
 938 }
 939
 940 static void abort_recovery_queue(struct obd_device *obd)
 941 {
 942         struct ptlrpc_request *req;
 943         struct list_head *tmp, *n;
 944         int rc;
 945
 946         list_for_each_safe(tmp, n, &obd->obd_recovery_queue) {
 947                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 948                 list_del(&req->rq_list);
 949                 DEBUG_REQ(D_ERROR, req, "aborted:");
 950                 req->rq_status = -ENOTCONN;
 951                 req->rq_type = PTL_RPC_MSG_ERR;
 952                 rc = lustre_pack_reply(req, 1, NULL, NULL);
 953                 if (rc == 0) {
 954                         ptlrpc_reply(req);
 955                 } else {
 956                         DEBUG_REQ(D_ERROR, req,
 957                                   "packing failed for abort-reply; skipping");
 958                 }
 959                 target_release_saved_req(req);
 960         }
 961 }
 962
 963 /* Called from a cleanup function if the device is being cleaned up
 964    forcefully.  The exports should all have been disconnected already,
 965    the only thing left to do is
 966      - clear the recovery flags
 967      - cancel the timer
 968      - free queued requests and replies, but don't send replies
 969    Because the obd_stopping flag is set, no new requests should be received.
 970
 971 */
 972 void target_cleanup_recovery(struct obd_device *obd)
 973 {
 974         struct list_head *tmp, *n;
 975         struct ptlrpc_request *req;
 976         ENTRY;
 977
 978         LASSERT(obd->obd_stopping);
 979
 980         spin_lock_bh(&obd->obd_processing_task_lock);
 981         if (!obd->obd_recovering) {
 982                 spin_unlock_bh(&obd->obd_processing_task_lock);
 983                 EXIT;
 984                 return;
 985         }
 986         obd->obd_recovering = obd->obd_abort_recovery = 0;
 987         target_cancel_recovery_timer(obd);
 988         spin_unlock_bh(&obd->obd_processing_task_lock);
 989
 990         list_for_each_safe(tmp, n, &obd->obd_delayed_reply_queue) {
 991                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 992                 list_del(&req->rq_list);
 993                 target_release_saved_req(req);
 994         }
 995
 996         list_for_each_safe(tmp, n, &obd->obd_recovery_queue) {
 997                 req = list_entry(tmp, struct ptlrpc_request, rq_list);
 998                 list_del(&req->rq_list);
 999                 target_release_saved_req(req);
1000         }
1001         EXIT;
1002 }
1003
1004 void target_abort_recovery(void *data)
1005 {
1006         struct obd_device *obd = data;
1007
1008         ENTRY;
1009         spin_lock_bh(&obd->obd_processing_task_lock);
1010         if (!obd->obd_recovering) {
1011                 spin_unlock_bh(&obd->obd_processing_task_lock);
1012                 EXIT;
1013                 return;
1014         }
1015         obd->obd_recovering = obd->obd_abort_recovery = 0;
1016         obd->obd_recoverable_clients = 0;
1017         target_cancel_recovery_timer(obd);
1018         spin_unlock_bh(&obd->obd_processing_task_lock);
1019
1020         LCONSOLE_WARN("%s: recovery period over; disconnecting unfinished "
1021                       "clients.\n", obd->obd_name);
1022         class_disconnect_stale_exports(obd);
1023         abort_recovery_queue(obd);
1024
1025         target_finish_recovery(obd);
1026         CDEBUG(D_HA, "%s: recovery complete\n", obd_uuid2str(&obd->obd_uuid));
1027         EXIT;
1028 }
1029
1030 static void target_recovery_expired(unsigned long castmeharder)
1031 {
1032         struct obd_device *obd = (struct obd_device *)castmeharder;
1033         CERROR("%s: recovery timed out, aborting\n", obd->obd_name);
1034         spin_lock_bh(&obd->obd_processing_task_lock);
1035         if (obd->obd_recovering)
1036                 obd->obd_abort_recovery = 1;
1037         cfs_waitq_signal(&obd->obd_next_transno_waitq);
1038         spin_unlock_bh(&obd->obd_processing_task_lock);
1039 }
1040
1041
1042 /* obd_processing_task_lock should be held */
1043 void target_cancel_recovery_timer(struct obd_device *obd)
1044 {
1045         CDEBUG(D_HA, "%s: cancel recovery timer\n", obd->obd_name);
1046         cfs_timer_disarm(&obd->obd_recovery_timer);
1047 }
1048
1049 static void reset_recovery_timer(struct obd_device *obd)
1050 {
1051         spin_lock_bh(&obd->obd_processing_task_lock);
1052         if (!obd->obd_recovering) {
1053                 spin_unlock_bh(&obd->obd_processing_task_lock);
1054                 return;
1055         }
1056         cfs_timer_arm(&obd->obd_recovery_timer,
1057                       cfs_time_shift(OBD_RECOVERY_TIMEOUT));
1058         spin_unlock_bh(&obd->obd_processing_task_lock);
1059         CDEBUG(D_HA, "%s: timer will expire in %u seconds\n", obd->obd_name,
1060                OBD_RECOVERY_TIMEOUT);
1061         /* Only used for lprocfs_status */
1062         obd->obd_recovery_end = CURRENT_SECONDS + OBD_RECOVERY_TIMEOUT;
1063 }
1064
1065
1066 /* Only start it the first time called */
1067 void target_start_recovery_timer(struct obd_device *obd, svc_handler_t handler)
1068 {
1069         spin_lock_bh(&obd->obd_processing_task_lock);
1070         if (obd->obd_recovery_handler) {
1071                 spin_unlock_bh(&obd->obd_processing_task_lock);
1072                 return;
1073         }
1074         CWARN("%s: starting recovery timer (%us)\n", obd->obd_name,
1075               OBD_RECOVERY_TIMEOUT);
1076         obd->obd_recovery_handler = handler;
1077         cfs_timer_init(&obd->obd_recovery_timer, target_recovery_expired, obd);
1078         spin_unlock_bh(&obd->obd_processing_task_lock);
1079
1080         reset_recovery_timer(obd);
1081 }
1082
1083 static int check_for_next_transno(struct obd_device *obd)
1084 {
1085         struct ptlrpc_request *req;
1086         int wake_up = 0, connected, completed, queue_len, max;
1087         __u64 next_transno, req_transno;
1088
1089         spin_lock_bh(&obd->obd_processing_task_lock);
1090         req = list_entry(obd->obd_recovery_queue.next,
1091                          struct ptlrpc_request, rq_list);
1092         max = obd->obd_max_recoverable_clients;
1093         req_transno = lustre_msg_get_transno(req->rq_reqmsg);
1094         connected = obd->obd_connected_clients;
1095         completed = max - obd->obd_recoverable_clients;
1096         queue_len = obd->obd_requests_queued_for_recovery;
1097         next_transno = obd->obd_next_recovery_transno;
1098
1099         CDEBUG(D_HA,"max: %d, connected: %d, completed: %d, queue_len: %d, "
1100                "req_transno: "LPU64", next_transno: "LPU64"\n",
1101                max, connected, completed, queue_len, req_transno, next_transno);
1102         if (obd->obd_abort_recovery) {
1103                 CDEBUG(D_HA, "waking for aborted recovery\n");
1104                 wake_up = 1;
1105         } else if (!obd->obd_recovering) {
1106                 CDEBUG(D_HA, "waking for completed recovery (?)\n");
1107                 wake_up = 1;
1108         } else if (req_transno == next_transno) {
1109                 CDEBUG(D_HA, "waking for next ("LPD64")\n", next_transno);
1110                 wake_up = 1;
1111         } else if (queue_len + completed == max) {
1112                 CDEBUG(D_ERROR,
1113                        "waking for skipped transno (skip: "LPD64
1114                        ", ql: %d, comp: %d, conn: %d, next: "LPD64")\n",
1115                        next_transno, queue_len, completed, max, req_transno);
1116                 obd->obd_next_recovery_transno = req_transno;
1117                 wake_up = 1;
1118         }
1119         spin_unlock_bh(&obd->obd_processing_task_lock);
1120         LASSERT(lustre_msg_get_transno(req->rq_reqmsg) >= next_transno);
1121         return wake_up;
1122 }
1123
1124 static void process_recovery_queue(struct obd_device *obd)
1125 {
1126         struct ptlrpc_request *req;
1127         int abort_recovery = 0;
1128         struct l_wait_info lwi = { 0 };
1129         ENTRY;
1130
1131         for (;;) {
1132                 spin_lock_bh(&obd->obd_processing_task_lock);
1133                 LASSERT(obd->obd_processing_task == cfs_curproc_pid());
1134                 req = list_entry(obd->obd_recovery_queue.next,
1135                                  struct ptlrpc_request, rq_list);
1136
1137                 if (lustre_msg_get_transno(req->rq_reqmsg) !=
1138                     obd->obd_next_recovery_transno) {
1139                         spin_unlock_bh(&obd->obd_processing_task_lock);
1140                         CDEBUG(D_HA, "Waiting for transno "LPD64" (1st is "
1141                                LPD64")\n",
1142                                obd->obd_next_recovery_transno,
1143                                lustre_msg_get_transno(req->rq_reqmsg));
1144                         l_wait_event(obd->obd_next_transno_waitq,
1145                                      check_for_next_transno(obd), &lwi);
1146                         spin_lock_bh(&obd->obd_processing_task_lock);
1147                         abort_recovery = obd->obd_abort_recovery;
1148                         spin_unlock_bh(&obd->obd_processing_task_lock);
1149                         if (abort_recovery) {
1150                                 target_abort_recovery(obd);
1151                                 return;
1152                         }
1153                         continue;
1154                 }
1155                 list_del_init(&req->rq_list);
1156                 obd->obd_requests_queued_for_recovery--;
1157                 spin_unlock_bh(&obd->obd_processing_task_lock);
1158
1159                 DEBUG_REQ(D_HA, req, "processing: ");
1160                 (void)obd->obd_recovery_handler(req);
1161                 obd->obd_replayed_requests++;
1162                 reset_recovery_timer(obd);
1163                 /* bug 1580: decide how to properly sync() in recovery */
1164                 //mds_fsync_super(obd->u.obt.obt_sb);
1165                 class_export_put(req->rq_export);
1166                 if (req->rq_reply_state != NULL) {
1167                         ptlrpc_rs_decref(req->rq_reply_state);
1168                         /* req->rq_reply_state = NULL; */
1169                 }
1170                 OBD_FREE(req->rq_reqmsg, req->rq_reqlen);
1171                 OBD_FREE(req, sizeof *req);
1172                 spin_lock_bh(&obd->obd_processing_task_lock);
1173                 obd->obd_next_recovery_transno++;
1174                 if (list_empty(&obd->obd_recovery_queue)) {
1175                         obd->obd_processing_task = 0;
1176                         spin_unlock_bh(&obd->obd_processing_task_lock);
1177                         break;
1178                 }
1179                 spin_unlock_bh(&obd->obd_processing_task_lock);
1180         }
1181         EXIT;
1182 }
1183
1184 int target_queue_recovery_request(struct ptlrpc_request *req,
1185                                   struct obd_device *obd)
1186 {
1187         struct list_head *tmp;
1188         int inserted = 0;
1189         __u64 transno = lustre_msg_get_transno(req->rq_reqmsg);
1190         struct ptlrpc_request *saved_req;
1191         struct lustre_msg *reqmsg;
1192
1193         /* CAVEAT EMPTOR: The incoming request message has been swabbed
1194          * (i.e. buflens etc are in my own byte order), but type-dependent
1195          * buffers (eg mds_body, ost_body etc) have NOT been swabbed. */
1196
1197         if (!transno) {
1198                 CFS_INIT_LIST_HEAD(&req->rq_list);
1199                 DEBUG_REQ(D_HA, req, "not queueing");
1200                 return 1;
1201         }
1202
1203         /* XXX If I were a real man, these LBUGs would be sane cleanups. */
1204         /* XXX just like the request-dup code in queue_final_reply */
1205         OBD_ALLOC(saved_req, sizeof *saved_req);
1206         if (!saved_req)
1207                 LBUG();
1208         OBD_ALLOC(reqmsg, req->rq_reqlen);
1209         if (!reqmsg)
1210                 LBUG();
1211
1212         spin_lock_bh(&obd->obd_processing_task_lock);
1213
1214         /* If we're processing the queue, we want don't want to queue this
1215          * message.
1216          *
1217          * Also, if this request has a transno less than the one we're waiting
1218          * for, we should process it now.  It could (and currently always will)
1219          * be an open request for a descriptor that was opened some time ago.
1220          *
1221          * Also, a resent, replayed request that has already been
1222          * handled will pass through here and be processed immediately.
1223          */
1224         if (obd->obd_processing_task == cfs_curproc_pid() ||
1225             transno < obd->obd_next_recovery_transno) {
1226                 /* Processing the queue right now, don't re-add. */
1227                 LASSERT(list_empty(&req->rq_list));
1228                 spin_unlock_bh(&obd->obd_processing_task_lock);
1229                 OBD_FREE(reqmsg, req->rq_reqlen);
1230                 OBD_FREE(saved_req, sizeof *saved_req);
1231                 return 1;
1232         }
1233
1234         /* A resent, replayed request that is still on the queue; just drop it.
1235            The queued request will handle this. */
1236         if ((lustre_msg_get_flags(req->rq_reqmsg) & (MSG_RESENT|MSG_REPLAY)) ==
1237             (MSG_RESENT | MSG_REPLAY)) {
1238                 DEBUG_REQ(D_ERROR, req, "dropping resent queued req");
1239                 spin_unlock_bh(&obd->obd_processing_task_lock);
1240                 OBD_FREE(reqmsg, req->rq_reqlen);
1241                 OBD_FREE(saved_req, sizeof *saved_req);
1242                 return 0;
1243         }
1244
1245         memcpy(saved_req, req, sizeof *req);
1246         memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1247         req = saved_req;
1248         req->rq_reqmsg = reqmsg;
1249         class_export_get(req->rq_export);
1250         CFS_INIT_LIST_HEAD(&req->rq_list);
1251
1252         /* XXX O(n^2) */
1253         list_for_each(tmp, &obd->obd_recovery_queue) {
1254                 struct ptlrpc_request *reqiter =
1255                         list_entry(tmp, struct ptlrpc_request, rq_list);
1256
1257                 if (lustre_msg_get_transno(reqiter->rq_reqmsg) > transno) {
1258                         list_add_tail(&req->rq_list, &reqiter->rq_list);
1259                         inserted = 1;
1260                         break;
1261                 }
1262         }
1263
1264         if (!inserted) {
1265                 list_add_tail(&req->rq_list, &obd->obd_recovery_queue);
1266         }
1267
1268         obd->obd_requests_queued_for_recovery++;
1269
1270         if (obd->obd_processing_task != 0) {
1271                 /* Someone else is processing this queue, we'll leave it to
1272                  * them.
1273                  */
1274                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1275                 spin_unlock_bh(&obd->obd_processing_task_lock);
1276                 return 0;
1277         }
1278
1279         /* Nobody is processing, and we know there's (at least) one to process
1280          * now, so we'll do the honours.
1281          */
1282         obd->obd_processing_task = cfs_curproc_pid();
1283         spin_unlock_bh(&obd->obd_processing_task_lock);
1284
1285         process_recovery_queue(obd);
1286         return 0;
1287 }
1288
1289 struct obd_device * target_req2obd(struct ptlrpc_request *req)
1290 {
1291         return req->rq_export->exp_obd;
1292 }
1293
1294 int target_queue_final_reply(struct ptlrpc_request *req, int rc)
1295 {
1296         struct obd_device *obd = target_req2obd(req);
1297         struct ptlrpc_request *saved_req;
1298         struct lustre_msg *reqmsg;
1299         int recovery_done = 0;
1300
1301         LASSERT ((rc == 0) == (req->rq_reply_state != NULL));
1302
1303         if (rc) {
1304                 /* Just like ptlrpc_error, but without the sending. */
1305                 rc = lustre_pack_reply(req, 1, NULL, NULL);
1306                 LASSERT(rc == 0); /* XXX handle this */
1307                 req->rq_type = PTL_RPC_MSG_ERR;
1308         }
1309
1310         LASSERT (!req->rq_reply_state->rs_difficult);
1311         LASSERT(list_empty(&req->rq_list));
1312         /* XXX a bit like the request-dup code in queue_recovery_request */
1313         OBD_ALLOC(saved_req, sizeof *saved_req);
1314         if (!saved_req)
1315                 LBUG();
1316         OBD_ALLOC(reqmsg, req->rq_reqlen);
1317         if (!reqmsg)
1318                 LBUG();
1319         *saved_req = *req;
1320         memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen);
1321
1322         /* Don't race cleanup */
1323         spin_lock_bh(&obd->obd_processing_task_lock);
1324         if (obd->obd_stopping) {
1325                 spin_unlock_bh(&obd->obd_processing_task_lock);
1326                 OBD_FREE(reqmsg, req->rq_reqlen);
1327                 OBD_FREE(saved_req, sizeof *req);
1328                 req->rq_status = -ENOTCONN;
1329                 /* rv is ignored anyhow */
1330                 return -ENOTCONN;
1331         }
1332         ptlrpc_rs_addref(req->rq_reply_state);  /* +1 ref for saved reply */
1333         req = saved_req;
1334         req->rq_reqmsg = reqmsg;
1335         class_export_get(req->rq_export);
1336         list_add(&req->rq_list, &obd->obd_delayed_reply_queue);
1337
1338         /* only count the first "replay over" request from each
1339            export */
1340         if (req->rq_export->exp_replay_needed) {
1341                 --obd->obd_recoverable_clients;
1342                 req->rq_export->exp_replay_needed = 0;
1343         }
1344         recovery_done = (obd->obd_recoverable_clients == 0);
1345         spin_unlock_bh(&obd->obd_processing_task_lock);
1346
1347         OBD_RACE(OBD_FAIL_LDLM_RECOV_CLIENTS);
1348         if (recovery_done) {
1349                 spin_lock_bh(&obd->obd_processing_task_lock);
1350                 obd->obd_recovering = obd->obd_abort_recovery = 0;
1351                 target_cancel_recovery_timer(obd);
1352                 spin_unlock_bh(&obd->obd_processing_task_lock);
1353
1354                 target_finish_recovery(obd);
1355                 CDEBUG(D_HA, "%s: recovery complete\n",
1356                        obd_uuid2str(&obd->obd_uuid));
1357         } else {
1358                 CWARN("%s: %d recoverable clients remain\n",
1359                        obd->obd_name, obd->obd_recoverable_clients);
1360                 cfs_waitq_signal(&obd->obd_next_transno_waitq);
1361         }
1362
1363         return 1;
1364 }
1365
1366 int
1367 target_send_reply_msg (struct ptlrpc_request *req, int rc, int fail_id)
1368 {
1369         if (OBD_FAIL_CHECK(fail_id | OBD_FAIL_ONCE)) {
1370                 obd_fail_loc |= OBD_FAIL_ONCE | OBD_FAILED;
1371                 DEBUG_REQ(D_ERROR, req, "dropping reply");
1372                 return (-ECOMM);
1373         }
1374
1375         if (rc) {
1376                 DEBUG_REQ(D_ERROR, req, "processing error (%d)", rc);
1377                 req->rq_status = rc;
1378                 return (ptlrpc_error(req));
1379         } else {
1380                 DEBUG_REQ(D_NET, req, "sending reply");
1381         }
1382
1383         return (ptlrpc_send_reply(req, 1));
1384 }
1385
1386 void
1387 target_send_reply(struct ptlrpc_request *req, int rc, int fail_id)
1388 {
1389         int                        netrc;
1390         struct ptlrpc_reply_state *rs;
1391         struct obd_device         *obd;
1392         struct obd_export         *exp;
1393         struct ptlrpc_service     *svc;
1394
1395         svc = req->rq_rqbd->rqbd_service;
1396         rs = req->rq_reply_state;
1397         if (rs == NULL || !rs->rs_difficult) {
1398                 /* no notifiers */
1399                 target_send_reply_msg (req, rc, fail_id);
1400                 return;
1401         }
1402
1403         /* must be an export if locks saved */
1404         LASSERT (req->rq_export != NULL);
1405         /* req/reply consistent */
1406         LASSERT (rs->rs_service == svc);
1407
1408         /* "fresh" reply */
1409         LASSERT (!rs->rs_scheduled);
1410         LASSERT (!rs->rs_scheduled_ever);
1411         LASSERT (!rs->rs_handled);
1412         LASSERT (!rs->rs_on_net);
1413         LASSERT (rs->rs_export == NULL);
1414         LASSERT (list_empty(&rs->rs_obd_list));
1415         LASSERT (list_empty(&rs->rs_exp_list));
1416
1417         exp = class_export_get (req->rq_export);
1418         obd = exp->exp_obd;
1419
1420         /* disable reply scheduling onto srv_reply_queue while I'm setting up */
1421         rs->rs_scheduled = 1;
1422         rs->rs_on_net    = 1;
1423         rs->rs_xid       = req->rq_xid;
1424         rs->rs_transno   = req->rq_transno;
1425         rs->rs_export    = exp;
1426
1427         spin_lock(&obd->obd_uncommitted_replies_lock);
1428
1429         if (rs->rs_transno > obd->obd_last_committed) {
1430                 /* not committed already */
1431                 list_add_tail (&rs->rs_obd_list,
1432                                &obd->obd_uncommitted_replies);
1433         }
1434
1435         spin_unlock (&obd->obd_uncommitted_replies_lock);
1436         spin_lock (&exp->exp_lock);
1437
1438         list_add_tail (&rs->rs_exp_list, &exp->exp_outstanding_replies);
1439
1440         spin_unlock(&exp->exp_lock);
1441
1442         netrc = target_send_reply_msg (req, rc, fail_id);
1443
1444         spin_lock(&svc->srv_lock);
1445
1446         svc->srv_n_difficult_replies++;
1447
1448         if (netrc != 0) {
1449                 /* error sending: reply is off the net.  Also we need +1
1450                  * reply ref until ptlrpc_server_handle_reply() is done
1451                  * with the reply state (if the send was successful, there
1452                  * would have been +1 ref for the net, which
1453                  * reply_out_callback leaves alone) */
1454                 rs->rs_on_net = 0;
1455                 ptlrpc_rs_addref(rs);
1456                 atomic_inc (&svc->srv_outstanding_replies);
1457         }
1458
1459         if (!rs->rs_on_net ||                   /* some notifier */
1460             list_empty(&rs->rs_exp_list) ||     /* completed already */
1461             list_empty(&rs->rs_obd_list)) {
1462                 list_add_tail (&rs->rs_list, &svc->srv_reply_queue);
1463                 cfs_waitq_signal (&svc->srv_waitq);
1464         } else {
1465                 list_add (&rs->rs_list, &svc->srv_active_replies);
1466                 rs->rs_scheduled = 0;           /* allow notifier to schedule */
1467         }
1468
1469         spin_unlock(&svc->srv_lock);
1470 }
1471
1472 int target_handle_ping(struct ptlrpc_request *req)
1473 {
1474         obd_ping(req->rq_export);
1475         return lustre_pack_reply(req, 1, NULL, NULL);
1476 }
1477
1478 void target_committed_to_req(struct ptlrpc_request *req)
1479 {
1480         struct obd_device *obd = req->rq_export->exp_obd;
1481
1482         if (!obd->obd_no_transno && req->rq_repmsg != NULL)
1483                 lustre_msg_set_last_committed(req->rq_repmsg,
1484                                               obd->obd_last_committed);
1485         else
1486                 DEBUG_REQ(D_IOCTL, req, "not sending last_committed update");
1487
1488         CDEBUG(D_INFO, "last_committed "LPU64", xid "LPU64"\n",
1489                obd->obd_last_committed, req->rq_xid);
1490 }
1491
1492 EXPORT_SYMBOL(target_committed_to_req);
1493
1494 #ifdef HAVE_QUOTA_SUPPORT
1495 int target_handle_qc_callback(struct ptlrpc_request *req)
1496 {
1497         struct obd_quotactl *oqctl;
1498         struct client_obd *cli = &req->rq_export->exp_obd->u.cli;
1499
1500         oqctl = lustre_swab_reqbuf(req, REQ_REC_OFF, sizeof(*oqctl),
1501                                    lustre_swab_obd_quotactl);
1502         if (oqctl == NULL) {
1503                 CERROR("Can't unpack obd_quotactl\n");
1504                 RETURN(-EPROTO);
1505         }
1506
1507         cli->cl_qchk_stat = oqctl->qc_stat;
1508
1509         return 0;
1510 }
1511
1512 int target_handle_dqacq_callback(struct ptlrpc_request *req)
1513 {
1514 #ifdef __KERNEL__
1515         struct obd_device *obd = req->rq_export->exp_obd;
1516         struct obd_device *master_obd;
1517         struct lustre_quota_ctxt *qctxt;
1518         struct qunit_data *qdata;
1519         void* rep;
1520         struct qunit_data_old *qdata_old;
1521         int rc = 0;
1522         int repsize[2] = { sizeof(struct ptlrpc_body),
1523                            sizeof(struct qunit_data) };
1524         ENTRY;
1525
1526         rc = lustre_pack_reply(req, 2, repsize, NULL);
1527         if (rc) {
1528                 CERROR("packing reply failed!: rc = %d\n", rc);
1529                 RETURN(rc);
1530         }
1531         LASSERT(req->rq_export);
1532
1533         /* fixed for bug10707 */
1534         if ((req->rq_export->exp_connect_flags & OBD_CONNECT_QUOTA64) &&
1535             !OBD_FAIL_CHECK(OBD_FAIL_QUOTA_QD_COUNT_32BIT)) {
1536                 CDEBUG(D_QUOTA, "qd_count is 64bit!\n");
1537                 rep = lustre_msg_buf(req->rq_repmsg, REPLY_REC_OFF,
1538                                      sizeof(struct qunit_data));
1539                 LASSERT(rep);
1540                 qdata = lustre_swab_reqbuf(req, REQ_REC_OFF, sizeof(*qdata),
1541                                            lustre_swab_qdata);
1542         } else {
1543                 CDEBUG(D_QUOTA, "qd_count is 32bit!\n");
1544                 rep = lustre_msg_buf(req->rq_repmsg, REPLY_REC_OFF,
1545                                      sizeof(struct qunit_data_old));
1546                 LASSERT(rep);
1547                 qdata_old = lustre_swab_reqbuf(req, REQ_REC_OFF, sizeof(*qdata_old),
1548                                                lustre_swab_qdata_old);
1549                 qdata = lustre_quota_old_to_new(qdata_old);
1550         }
1551
1552         if (qdata == NULL) {
1553                 CERROR("Can't unpack qunit_data\n");
1554                 RETURN(-EPROTO);
1555         }
1556
1557         /* we use the observer */
1558         LASSERT(obd->obd_observer && obd->obd_observer->obd_observer);
1559         master_obd = obd->obd_observer->obd_observer;
1560         qctxt = &master_obd->u.obt.obt_qctxt;
1561
1562         LASSERT(qctxt->lqc_handler);
1563         rc = qctxt->lqc_handler(master_obd, qdata,
1564                                 lustre_msg_get_opc(req->rq_reqmsg));
1565         if (rc && rc != -EDQUOT)
1566                 CDEBUG(rc == -EBUSY  ? D_QUOTA : D_ERROR,
1567                        "dqacq failed! (rc:%d)\n", rc);
1568
1569         /* the qd_count might be changed in lqc_handler */
1570         if ((req->rq_export->exp_connect_flags & OBD_CONNECT_QUOTA64) &&
1571             !OBD_FAIL_CHECK(OBD_FAIL_QUOTA_QD_COUNT_32BIT)) {
1572                 memcpy(rep,qdata,sizeof(*qdata));
1573         } else {
1574                 qdata_old = lustre_quota_new_to_old(qdata);
1575                 memcpy(rep,qdata_old,sizeof(*qdata_old));
1576         }
1577         req->rq_status = rc;
1578         rc = ptlrpc_reply(req);
1579
1580         RETURN(rc);
1581 #else
1582         return 0;
1583 #endif /* !__KERNEL__ */
1584 }
1585 #endif /* HAVE_QUOTA_SUPPORT */
1586
1587 ldlm_mode_t lck_compat_array[] = {
1588         [LCK_EX] LCK_COMPAT_EX,
1589         [LCK_PW] LCK_COMPAT_PW,
1590         [LCK_PR] LCK_COMPAT_PR,
1591         [LCK_CW] LCK_COMPAT_CW,
1592         [LCK_CR] LCK_COMPAT_CR,
1593         [LCK_NL] LCK_COMPAT_NL,
1594         [LCK_GROUP] LCK_COMPAT_GROUP
1595 };