lustre/obdecho/echo.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (c) 2001-2003 Cluster File Systems, Inc.
   5  *   Author: Peter Braam <braam@clusterfs.com>
   6  *   Author: Andreas Dilger <adilger@clusterfs.com>
   7  *
   8  *   This file is part of the Lustre file system, http://www.lustre.org
   9  *   Lustre is a trademark of Cluster File Systems, Inc.
  10  *
  11  *   You may have signed or agreed to another license before downloading
  12  *   this software.  If so, you are bound by the terms and conditions
  13  *   of that agreement, and the following does not apply to you.  See the
  14  *   LICENSE file included with this distribution for more information.
  15  *
  16  *   If you did not agree to a different license, then this copy of Lustre
  17  *   is open source software; you can redistribute it and/or modify it
  18  *   under the terms of version 2 of the GNU General Public License as
  19  *   published by the Free Software Foundation.
  20  *
  21  *   In either case, Lustre is distributed in the hope that it will be
  22  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  23  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  *   license text for more details.
  25  */
  26
  27 #ifndef EXPORT_SYMTAB
  28 # define EXPORT_SYMTAB
  29 #endif
  30
  31 #define DEBUG_SUBSYSTEM S_ECHO
  32
  33 #include <obd_support.h>
  34 #include <obd_class.h>
  35 #include <obd_echo.h>
  36 #include <lustre_debug.h>
  37 #include <lustre_dlm.h>
  38 #include <lprocfs_status.h>
  39
  40 #define ECHO_INIT_OBJID      0x1000000000000000ULL
  41 #define ECHO_HANDLE_MAGIC    0xabcd0123fedc9876ULL
  42
  43 #define ECHO_PERSISTENT_PAGES (ECHO_PERSISTENT_SIZE >> CFS_PAGE_SHIFT)
  44 static cfs_page_t *echo_persistent_pages[ECHO_PERSISTENT_PAGES];
  45
  46 enum {
  47         LPROC_ECHO_READ_BYTES = 1,
  48         LPROC_ECHO_WRITE_BYTES = 2,
  49         LPROC_ECHO_LAST = LPROC_ECHO_WRITE_BYTES +1
  50 };
  51
  52 static int echo_connect(struct lustre_handle *conn, struct obd_device *obd,
  53                         struct obd_uuid *cluuid, struct obd_connect_data *data)
  54 {
  55         data->ocd_connect_flags &= ECHO_CONNECT_SUPPORTED;
  56         return class_connect(conn, obd, cluuid);
  57 }
  58
  59 static int echo_disconnect(struct obd_export *exp)
  60 {
  61         LASSERT (exp != NULL);
  62
  63         ldlm_cancel_locks_for_export(exp);
  64
  65         /* complete all outstanding replies */
  66         spin_lock(&exp->exp_lock);
  67         while (!list_empty(&exp->exp_outstanding_replies)) {
  68                 struct ptlrpc_reply_state *rs =
  69                         list_entry(exp->exp_outstanding_replies.next,
  70                                    struct ptlrpc_reply_state, rs_exp_list);
  71                 struct ptlrpc_service *svc = rs->rs_service;
  72
  73                 spin_lock(&svc->srv_lock);
  74                 list_del_init(&rs->rs_exp_list);
  75                 ptlrpc_schedule_difficult_reply(rs);
  76                 spin_unlock(&svc->srv_lock);
  77         }
  78         spin_unlock(&exp->exp_lock);
  79
  80         return class_disconnect(exp);
  81 }
  82
  83 static int echo_destroy_export(struct obd_export *exp)
  84 {
  85         ENTRY;
  86
  87         target_destroy_export(exp);
  88
  89         RETURN(0);
  90 }
  91
  92  static __u64 echo_next_id(struct obd_device *obddev)
  93 {
  94         obd_id id;
  95
  96         spin_lock(&obddev->u.echo.eo_lock);
  97         id = ++obddev->u.echo.eo_lastino;
  98         spin_unlock(&obddev->u.echo.eo_lock);
  99
 100         return id;
 101 }
 102
 103 int echo_create(struct obd_export *exp, struct obdo *oa,
 104                 struct lov_stripe_md **ea, struct obd_trans_info *oti)
 105 {
 106         struct obd_device *obd = class_exp2obd(exp);
 107
 108         if (!obd) {
 109                 CERROR("invalid client cookie "LPX64"\n",
 110                        exp->exp_handle.h_cookie);
 111                 return -EINVAL;
 112         }
 113
 114         if (!(oa->o_mode && S_IFMT)) {
 115                 CERROR("echo obd: no type!\n");
 116                 return -ENOENT;
 117         }
 118
 119         if (!(oa->o_valid & OBD_MD_FLTYPE)) {
 120                 CERROR("invalid o_valid "LPX64"\n", oa->o_valid);
 121                 return -EINVAL;
 122         }
 123
 124         oa->o_id = echo_next_id(obd);
 125         oa->o_valid = OBD_MD_FLID;
 126
 127         return 0;
 128 }
 129
 130 int echo_destroy(struct obd_export *exp, struct obdo *oa,
 131                  struct lov_stripe_md *ea, struct obd_trans_info *oti,
 132                  struct obd_export *md_exp)
 133 {
 134         struct obd_device *obd = class_exp2obd(exp);
 135
 136         ENTRY;
 137         if (!obd) {
 138                 CERROR("invalid client cookie "LPX64"\n",
 139                        exp->exp_handle.h_cookie);
 140                 RETURN(-EINVAL);
 141         }
 142
 143         if (!(oa->o_valid & OBD_MD_FLID)) {
 144                 CERROR("obdo missing FLID valid flag: "LPX64"\n", oa->o_valid);
 145                 RETURN(-EINVAL);
 146         }
 147
 148         if (oa->o_id > obd->u.echo.eo_lastino || oa->o_id < ECHO_INIT_OBJID) {
 149                 CERROR("bad destroy objid: "LPX64"\n", oa->o_id);
 150                 RETURN(-EINVAL);
 151         }
 152
 153         RETURN(0);
 154 }
 155
 156 static int echo_getattr(struct obd_export *exp, struct obd_info *oinfo)
 157 {
 158         struct obd_device *obd = class_exp2obd(exp);
 159         obd_id id = oinfo->oi_oa->o_id;
 160
 161         ENTRY;
 162         if (!obd) {
 163                 CERROR("invalid client cookie "LPX64"\n",
 164                        exp->exp_handle.h_cookie);
 165                 RETURN(-EINVAL);
 166         }
 167
 168         if (!(oinfo->oi_oa->o_valid & OBD_MD_FLID)) {
 169                 CERROR("obdo missing FLID valid flag: "LPX64"\n",
 170                        oinfo->oi_oa->o_valid);
 171                 RETURN(-EINVAL);
 172         }
 173
 174         obdo_cpy_md(oinfo->oi_oa, &obd->u.echo.eo_oa, oinfo->oi_oa->o_valid);
 175         oinfo->oi_oa->o_id = id;
 176
 177         RETURN(0);
 178 }
 179
 180 static int echo_setattr(struct obd_export *exp, struct obd_info *oinfo,
 181                         struct obd_trans_info *oti)
 182 {
 183         struct obd_device *obd = class_exp2obd(exp);
 184
 185         ENTRY;
 186         if (!obd) {
 187                 CERROR("invalid client cookie "LPX64"\n",
 188                        exp->exp_handle.h_cookie);
 189                 RETURN(-EINVAL);
 190         }
 191
 192         if (!(oinfo->oi_oa->o_valid & OBD_MD_FLID)) {
 193                 CERROR("obdo missing FLID valid flag: "LPX64"\n",
 194                        oinfo->oi_oa->o_valid);
 195                 RETURN(-EINVAL);
 196         }
 197
 198         memcpy(&obd->u.echo.eo_oa, oinfo->oi_oa, sizeof(*oinfo->oi_oa));
 199
 200         if (oinfo->oi_oa->o_id & 4) {
 201                 /* Save lock to force ACKed reply */
 202                 ldlm_lock_addref (&obd->u.echo.eo_nl_lock, LCK_NL);
 203                 oti->oti_ack_locks[0].mode = LCK_NL;
 204                 oti->oti_ack_locks[0].lock = obd->u.echo.eo_nl_lock;
 205         }
 206
 207         RETURN(0);
 208 }
 209
 210 static void
 211 echo_page_debug_setup(cfs_page_t *page, int rw, obd_id id,
 212                       __u64 offset, int len)
 213 {
 214         int   page_offset = offset & ~CFS_PAGE_MASK;
 215         char *addr        = ((char *)cfs_kmap(page)) + page_offset;
 216
 217         if (len % OBD_ECHO_BLOCK_SIZE != 0)
 218                 CERROR("Unexpected block size %d\n", len);
 219
 220         while (len > 0) {
 221                 if (rw & OBD_BRW_READ)
 222                         block_debug_setup(addr, OBD_ECHO_BLOCK_SIZE,
 223                                           offset, id);
 224                 else
 225                         block_debug_setup(addr, OBD_ECHO_BLOCK_SIZE,
 226                                           0xecc0ecc0ecc0ecc0ULL,
 227                                           0xecc0ecc0ecc0ecc0ULL);
 228
 229                 addr   += OBD_ECHO_BLOCK_SIZE;
 230                 offset += OBD_ECHO_BLOCK_SIZE;
 231                 len    -= OBD_ECHO_BLOCK_SIZE;
 232         }
 233
 234         cfs_kunmap(page);
 235 }
 236
 237 static int
 238 echo_page_debug_check(cfs_page_t *page, obd_id id,
 239                       __u64 offset, int len)
 240 {
 241         int   page_offset = offset & ~CFS_PAGE_MASK;
 242         char *addr        = ((char *)cfs_kmap(page)) + page_offset;
 243         int   rc          = 0;
 244         int   rc2;
 245
 246         if (len % OBD_ECHO_BLOCK_SIZE != 0)
 247                 CERROR("Unexpected block size %d\n", len);
 248
 249         while (len > 0) {
 250                 rc2 = block_debug_check("echo", addr, OBD_ECHO_BLOCK_SIZE,
 251                                         offset, id);
 252
 253                 if (rc2 != 0 && rc == 0)
 254                         rc = rc2;
 255
 256                 addr   += OBD_ECHO_BLOCK_SIZE;
 257                 offset += OBD_ECHO_BLOCK_SIZE;
 258                 len    -= OBD_ECHO_BLOCK_SIZE;
 259         }
 260
 261         cfs_kunmap(page);
 262
 263         return (rc);
 264 }
 265
 266 /* This allows us to verify that desc_private is passed unmolested */
 267 #define DESC_PRIV 0x10293847
 268
 269 int echo_preprw(int cmd, struct obd_export *export, struct obdo *oa,
 270                 int objcount, struct obd_ioobj *obj, int niocount,
 271                 struct niobuf_remote *nb, struct niobuf_local *res,
 272                 struct obd_trans_info *oti)
 273 {
 274         struct obd_device *obd;
 275         struct niobuf_local *r = res;
 276         int tot_bytes = 0;
 277         int rc = 0;
 278         int i;
 279         ENTRY;
 280
 281         obd = export->exp_obd;
 282         if (obd == NULL)
 283                 RETURN(-EINVAL);
 284
 285         /* Temp fix to stop falling foul of osc_announce_cached() */
 286         oa->o_valid &= ~(OBD_MD_FLBLOCKS | OBD_MD_FLGRANT);
 287
 288         memset(res, 0, sizeof(*res) * niocount);
 289
 290         CDEBUG(D_PAGE, "%s %d obdos with %d IOs\n",
 291                cmd == OBD_BRW_READ ? "reading" : "writing", objcount, niocount);
 292
 293         if (oti)
 294                 oti->oti_handle = (void *)DESC_PRIV;
 295
 296         for (i = 0; i < objcount; i++, obj++) {
 297                 int gfp_mask = (obj->ioo_id & 1) ? CFS_ALLOC_HIGHUSER : CFS_ALLOC_STD;
 298                 int ispersistent = obj->ioo_id == ECHO_PERSISTENT_OBJID;
 299                 int debug_setup = (!ispersistent &&
 300                                    (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
 301                                    (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
 302                 int j;
 303
 304                 for (j = 0 ; j < obj->ioo_bufcnt ; j++, nb++, r++) {
 305
 306                         if (ispersistent &&
 307                             (nb->offset >> CFS_PAGE_SHIFT) < ECHO_PERSISTENT_PAGES) {
 308                                 r->page = echo_persistent_pages[nb->offset >>
 309                                                                 CFS_PAGE_SHIFT];
 310                                 /* Take extra ref so __free_pages() can be called OK */
 311                                 cfs_get_page (r->page);
 312                         } else {
 313                                 r->page = cfs_alloc_page(gfp_mask);
 314                                 if (r->page == NULL) {
 315                                         CERROR("can't get page %u/%u for id "
 316                                                LPU64"\n",
 317                                                j, obj->ioo_bufcnt, obj->ioo_id);
 318                                         GOTO(preprw_cleanup, rc = -ENOMEM);
 319                                 }
 320                         }
 321
 322                         tot_bytes += nb->len;
 323
 324                         atomic_inc(&obd->u.echo.eo_prep);
 325
 326                         r->offset = nb->offset;
 327                         r->len = nb->len;
 328                         LASSERT((r->offset & ~CFS_PAGE_MASK) + r->len <= CFS_PAGE_SIZE);
 329
 330                         CDEBUG(D_PAGE, "$$$$ get page %p @ "LPU64" for %d\n",
 331                                r->page, r->offset, r->len);
 332
 333                         if (cmd & OBD_BRW_READ)
 334                                 r->rc = r->len;
 335
 336                         if (debug_setup)
 337                                 echo_page_debug_setup(r->page, cmd, obj->ioo_id,
 338                                                       r->offset, r->len);
 339                 }
 340         }
 341         if (cmd & OBD_BRW_READ)
 342                 lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_READ_BYTES,
 343                                     tot_bytes);
 344         else
 345                 lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_WRITE_BYTES,
 346                                     tot_bytes);
 347
 348         CDEBUG(D_PAGE, "%d pages allocated after prep\n",
 349                atomic_read(&obd->u.echo.eo_prep));
 350
 351         RETURN(0);
 352
 353 preprw_cleanup:
 354         /* It is possible that we would rather handle errors by  allow
 355          * any already-set-up pages to complete, rather than tearing them
 356          * all down again.  I believe that this is what the in-kernel
 357          * prep/commit operations do.
 358          */
 359         CERROR("cleaning up %ld pages (%d obdos)\n", (long)(r - res), objcount);
 360         while (r-- > res) {
 361                 cfs_kunmap(r->page);
 362                 /* NB if this is a persistent page, __free_pages will just
 363                  * lose the extra ref gained above */
 364                 cfs_free_page(r->page);
 365                 atomic_dec(&obd->u.echo.eo_prep);
 366         }
 367         memset(res, 0, sizeof(*res) * niocount);
 368
 369         return rc;
 370 }
 371
 372 int echo_commitrw(int cmd, struct obd_export *export, struct obdo *oa,
 373                   int objcount, struct obd_ioobj *obj, int niocount,
 374                   struct niobuf_local *res, struct obd_trans_info *oti, int rc)
 375 {
 376         struct obd_device *obd;
 377         struct niobuf_local *r = res;
 378         int i, vrc = 0;
 379         ENTRY;
 380
 381         obd = export->exp_obd;
 382         if (obd == NULL)
 383                 RETURN(-EINVAL);
 384
 385         if (rc)
 386                 GOTO(commitrw_cleanup, rc);
 387
 388         if ((cmd & OBD_BRW_RWMASK) == OBD_BRW_READ) {
 389                 CDEBUG(D_PAGE, "reading %d obdos with %d IOs\n",
 390                        objcount, niocount);
 391         } else {
 392                 CDEBUG(D_PAGE, "writing %d obdos with %d IOs\n",
 393                        objcount, niocount);
 394         }
 395
 396         if (niocount && !r) {
 397                 CERROR("NULL res niobuf with niocount %d\n", niocount);
 398                 RETURN(-EINVAL);
 399         }
 400
 401         LASSERT(oti == NULL || oti->oti_handle == (void *)DESC_PRIV);
 402
 403         for (i = 0; i < objcount; i++, obj++) {
 404                 int verify = (rc == 0 &&
 405                               obj->ioo_id != ECHO_PERSISTENT_OBJID &&
 406                               (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
 407                               (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
 408                 int j;
 409
 410                 for (j = 0 ; j < obj->ioo_bufcnt ; j++, r++) {
 411                         cfs_page_t *page = r->page;
 412                         void *addr;
 413
 414                         if (page == NULL) {
 415                                 CERROR("null page objid "LPU64":%p, buf %d/%d\n",
 416                                        obj->ioo_id, page, j, obj->ioo_bufcnt);
 417                                 GOTO(commitrw_cleanup, rc = -EFAULT);
 418                         }
 419
 420                         addr = cfs_kmap(page);
 421
 422                         CDEBUG(D_PAGE, "$$$$ use page %p, addr %p@"LPU64"\n",
 423                                r->page, addr, r->offset);
 424
 425                         if (verify) {
 426                                 vrc = echo_page_debug_check(page, obj->ioo_id,
 427                                                             r->offset, r->len);
 428                                 /* check all the pages always */
 429                                 if (vrc != 0 && rc == 0)
 430                                         rc = vrc;
 431                         }
 432
 433                         cfs_kunmap(page);
 434                         /* NB see comment above regarding persistent pages */
 435                         cfs_free_page(page);
 436                         atomic_dec(&obd->u.echo.eo_prep);
 437                 }
 438         }
 439         CDEBUG(D_PAGE, "%d pages remain after commit\n",
 440                atomic_read(&obd->u.echo.eo_prep));
 441         RETURN(rc);
 442
 443 commitrw_cleanup:
 444         CERROR("cleaning up %ld pages (%d obdos)\n",
 445                niocount - (long)(r - res) - 1, objcount);
 446         while (++r < res + niocount) {
 447                 cfs_page_t *page = r->page;
 448
 449                 /* NB see comment above regarding persistent pages */
 450                 cfs_free_page(page);
 451                 atomic_dec(&obd->u.echo.eo_prep);
 452         }
 453         return rc;
 454 }
 455
 456 static int echo_setup(struct obd_device *obd, obd_count len, void *buf)
 457 {
 458         struct lprocfs_static_vars lvars;
 459         int                        rc;
 460         int                        lock_flags = 0;
 461         struct ldlm_res_id         res_id = {.name = {1}};
 462         ENTRY;
 463
 464         spin_lock_init(&obd->u.echo.eo_lock);
 465         obd->u.echo.eo_lastino = ECHO_INIT_OBJID;
 466
 467         obd->obd_namespace = ldlm_namespace_new("echo-tgt",
 468                                                 LDLM_NAMESPACE_SERVER);
 469         if (obd->obd_namespace == NULL) {
 470                 LBUG();
 471                 RETURN(-ENOMEM);
 472         }
 473
 474         rc = ldlm_cli_enqueue_local(obd->obd_namespace, res_id, LDLM_PLAIN,
 475                                     NULL, LCK_NL, &lock_flags, NULL,
 476                                     ldlm_completion_ast, NULL, NULL,
 477                                     0, NULL, &obd->u.echo.eo_nl_lock);
 478         LASSERT (rc == ELDLM_OK);
 479
 480         lprocfs_init_vars(echo, &lvars);
 481         if (lprocfs_obd_setup(obd, lvars.obd_vars) == 0 &&
 482             lprocfs_alloc_obd_stats(obd, LPROC_ECHO_LAST) == 0) {
 483                 lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_READ_BYTES,
 484                                      LPROCFS_CNTR_AVGMINMAX,
 485                                      "read_bytes", "bytes");
 486                 lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_WRITE_BYTES,
 487                                      LPROCFS_CNTR_AVGMINMAX,
 488                                      "write_bytes", "bytes");
 489         }
 490
 491         ptlrpc_init_client (LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
 492                             "echo_ldlm_cb_client", &obd->obd_ldlm_client);
 493         RETURN(0);
 494 }
 495
 496 static int echo_cleanup(struct obd_device *obd)
 497 {
 498         int leaked;
 499         ENTRY;
 500
 501         lprocfs_obd_cleanup(obd);
 502         lprocfs_free_obd_stats(obd);
 503
 504         ldlm_lock_decref (&obd->u.echo.eo_nl_lock, LCK_NL);
 505
 506         /* XXX Bug 3413; wait for a bit to ensure the BL callback has
 507          * happened before calling ldlm_namespace_free() */
 508         set_current_state (TASK_UNINTERRUPTIBLE);
 509         cfs_schedule_timeout (CFS_TASK_UNINT, cfs_time_seconds(1));
 510
 511         ldlm_namespace_free(obd->obd_namespace, obd->obd_force);
 512
 513         leaked = atomic_read(&obd->u.echo.eo_prep);
 514         if (leaked != 0)
 515                 CERROR("%d prep/commitrw pages leaked\n", leaked);
 516
 517         RETURN(0);
 518 }
 519
 520 static struct obd_ops echo_obd_ops = {
 521         .o_owner           = THIS_MODULE,
 522         .o_connect         = echo_connect,
 523         .o_disconnect      = echo_disconnect,
 524         .o_destroy_export  = echo_destroy_export,
 525         .o_create          = echo_create,
 526         .o_destroy         = echo_destroy,
 527         .o_getattr         = echo_getattr,
 528         .o_setattr         = echo_setattr,
 529         .o_preprw          = echo_preprw,
 530         .o_commitrw        = echo_commitrw,
 531         .o_setup           = echo_setup,
 532         .o_cleanup         = echo_cleanup
 533 };
 534
 535 extern int echo_client_init(void);
 536 extern void echo_client_exit(void);
 537
 538 static void
 539 echo_persistent_pages_fini (void)
 540 {
 541         int     i;
 542
 543         for (i = 0; i < ECHO_PERSISTENT_PAGES; i++)
 544                 if (echo_persistent_pages[i] != NULL) {
 545                         cfs_free_page (echo_persistent_pages[i]);
 546                         echo_persistent_pages[i] = NULL;
 547                 }
 548 }
 549
 550 static int
 551 echo_persistent_pages_init (void)
 552 {
 553         cfs_page_t *pg;
 554         int          i;
 555
 556         for (i = 0; i < ECHO_PERSISTENT_PAGES; i++) {
 557                 int gfp_mask = (i < ECHO_PERSISTENT_PAGES/2) ?
 558                         CFS_ALLOC_STD : CFS_ALLOC_HIGHUSER;
 559
 560                 pg = cfs_alloc_page (gfp_mask);
 561                 if (pg == NULL) {
 562                         echo_persistent_pages_fini ();
 563                         return (-ENOMEM);
 564                 }
 565
 566                 memset (cfs_kmap (pg), 0, CFS_PAGE_SIZE);
 567                 cfs_kunmap (pg);
 568
 569                 echo_persistent_pages[i] = pg;
 570         }
 571
 572         return (0);
 573 }
 574
 575 static int __init obdecho_init(void)
 576 {
 577         struct lprocfs_static_vars lvars;
 578         int rc;
 579
 580         ENTRY;
 581         printk(KERN_INFO "Lustre: Echo OBD driver; info@clusterfs.com\n");
 582
 583         LASSERT(CFS_PAGE_SIZE % OBD_ECHO_BLOCK_SIZE == 0);
 584
 585         lprocfs_init_vars(echo, &lvars);
 586
 587         rc = echo_persistent_pages_init ();
 588         if (rc != 0)
 589                 goto failed_0;
 590
 591         rc = class_register_type(&echo_obd_ops, lvars.module_vars,
 592                                  LUSTRE_ECHO_NAME);
 593         if (rc != 0)
 594                 goto failed_1;
 595
 596         rc = echo_client_init();
 597         if (rc == 0)
 598                 RETURN (0);
 599
 600         class_unregister_type(LUSTRE_ECHO_NAME);
 601  failed_1:
 602         echo_persistent_pages_fini ();
 603  failed_0:
 604         RETURN(rc);
 605 }
 606
 607 static void /*__exit*/ obdecho_exit(void)
 608 {
 609         echo_client_exit();
 610         class_unregister_type(LUSTRE_ECHO_NAME);
 611         echo_persistent_pages_fini ();
 612 }
 613
 614 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 615 MODULE_DESCRIPTION("Lustre Testing Echo OBD driver");
 616 MODULE_LICENSE("GPL");
 617
 618 cfs_module(obdecho, "1.0.0", obdecho_init, obdecho_exit);