lustre/ost/ost_handler.c

   1 /*
   2  *  ost/ost_handler.c
   3  *  Storage Target Handling functions
   4  *
   5  *  Lustre Object Server Module (OST)
   6  *
   7  *  Copyright (C) 2001  Cluster File Systems, Inc.
   8  *
   9  *  This code is issued under the GNU General Public License.
  10  *  See the file COPYING in this distribution
  11  *
  12  *  by Peter Braam <braam@clusterfs.com>
  13  *
  14  *  This server is single threaded at present (but can easily be multi threaded).
  15  *  For testing and management it is treated as an obd_device, although it does
  16  *  not export a full OBD method table (the requests are coming in over the wire,
  17  *  so object target modules do not have a full method table.)
  18  *
  19  */
  20
  21
  22 #define EXPORT_SYMTAB
  23
  24 #include <linux/version.h>
  25 #include <linux/module.h>
  26 #include <linux/fs.h>
  27 #include <linux/stat.h>
  28 #include <linux/locks.h>
  29 #include <linux/ext2_fs.h>
  30 #include <linux/quotaops.h>
  31 #include <asm/unistd.h>
  32 #include <linux/obd_support.h>
  33 #include <linux/obd.h>
  34 #include <linux/obd_class.h>
  35 #include <linux/lustre_lib.h>
  36 #include <linux/lustre_idl.h>
  37 #include <linux/lustre_mds.h>
  38 #include <linux/obd_class.h>
  39
  40 // for testing
  41 static int ost_queue_req(struct obd_device *obddev, struct ptlrpc_request *req)
  42 {
  43         struct ptlrpc_request *srv_req;
  44         struct ost_obd *ost = &obddev->u.ost;
  45
  46         if (!ost) {
  47                 EXIT;
  48                 return -1;
  49         }
  50
  51         srv_req = kmalloc(sizeof(*srv_req), GFP_KERNEL);
  52         if (!srv_req) {
  53                 EXIT;
  54                 return -ENOMEM;
  55         }
  56
  57         printk("---> OST at %d %p, incoming req %p, srv_req %p\n",
  58                __LINE__, ost, req, srv_req);
  59
  60         memset(srv_req, 0, sizeof(*req));
  61
  62         /* move the request buffer */
  63         srv_req->rq_reqbuf = req->rq_reqbuf;
  64         srv_req->rq_reqlen    = req->rq_reqlen;
  65         srv_req->rq_ost = ost;
  66
  67         /* remember where it came from */
  68         srv_req->rq_reply_handle = req;
  69
  70         list_add(&srv_req->rq_list, &ost->ost_reqs);
  71         wake_up(&ost->ost_waitq);
  72         return 0;
  73 }
  74
  75
  76 /* XXX replace with networking code */
  77 int ost_reply(struct obd_device *obddev, struct ptlrpc_request *req)
  78 {
  79         struct ptlrpc_request *clnt_req = req->rq_reply_handle;
  80
  81         ENTRY;
  82         printk("ost_reply: req %p clnt_req at %p\n", req, clnt_req);
  83
  84         /* free the request buffer */
  85         kfree(req->rq_reqbuf);
  86         req->rq_reqbuf = NULL;
  87
  88         /* move the reply to the client */
  89         clnt_req->rq_replen = req->rq_replen;
  90         clnt_req->rq_repbuf = req->rq_repbuf;
  91
  92         printk("---> client req %p repbuf %p len %d status %d\n",
  93                clnt_req, clnt_req->rq_repbuf, clnt_req->rq_replen,
  94                req->rq_rephdr->status);
  95
  96         req->rq_repbuf = NULL;
  97         req->rq_replen = 0;
  98
  99         /* free the server request */
 100         kfree(req);
 101         /* wake up the client */
 102         wake_up_interruptible(&clnt_req->rq_wait_for_rep);
 103         EXIT;
 104         return 0;
 105 }
 106
 107 int ost_error(struct obd_device *obddev, struct ptlrpc_request *req)
 108 {
 109         struct ptlrep_hdr *hdr;
 110
 111         ENTRY;
 112         hdr = kmalloc(sizeof(*hdr), GFP_KERNEL);
 113         if (!hdr) {
 114                 EXIT;
 115                 return -ENOMEM;
 116         }
 117
 118         memset(hdr, 0, sizeof(*hdr));
 119
 120         hdr->seqno = req->rq_reqhdr->seqno;
 121         hdr->status = req->rq_status;
 122         hdr->type = OST_TYPE_ERR;
 123
 124         req->rq_repbuf = (char *)hdr;
 125         req->rq_replen = sizeof(*hdr);
 126
 127         EXIT;
 128         return ost_reply(obddev, req);
 129 }
 130
 131 static int ost_destroy(struct ost_obd *ost, struct ptlrpc_request *req)
 132 {
 133         struct obd_conn conn;
 134         int rc;
 135
 136         ENTRY;
 137
 138         conn.oc_id = req->rq_req.ost->connid;
 139         conn.oc_dev = ost->ost_tgt;
 140
 141         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep.ost,
 142                           &req->rq_replen, &req->rq_repbuf);
 143         if (rc) {
 144                 printk("ost_destroy: cannot pack reply\n");
 145                 return rc;
 146         }
 147
 148         req->rq_rep.ost->result =ost->ost_tgt->obd_type->typ_ops->o_destroy
 149                 (&conn, &req->rq_req.ost->oa);
 150
 151         EXIT;
 152         return 0;
 153 }
 154
 155 static int ost_getattr(struct ost_obd *ost, struct ptlrpc_request *req)
 156 {
 157         struct obd_conn conn;
 158         int rc;
 159
 160         ENTRY;
 161         printk("ost getattr entered\n");
 162
 163         conn.oc_id = req->rq_req.ost->connid;
 164         conn.oc_dev = ost->ost_tgt;
 165
 166         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep.ost,
 167                           &req->rq_replen, &req->rq_repbuf);
 168         if (rc) {
 169                 printk("ost_getattr: cannot pack reply\n");
 170                 return rc;
 171         }
 172         req->rq_rep.ost->oa.o_id = req->rq_req.ost->oa.o_id;
 173         req->rq_rep.ost->oa.o_valid = req->rq_req.ost->oa.o_valid;
 174
 175         req->rq_rep.ost->result =ost->ost_tgt->obd_type->typ_ops->o_getattr
 176                 (&conn, &req->rq_rep.ost->oa);
 177
 178         EXIT;
 179         return 0;
 180 }
 181
 182 static int ost_create(struct ost_obd *ost, struct ptlrpc_request *req)
 183 {
 184         struct obd_conn conn;
 185         int rc;
 186
 187         ENTRY;
 188
 189         conn.oc_id = req->rq_req.ost->connid;
 190         conn.oc_dev = ost->ost_tgt;
 191
 192         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep.ost,
 193                           &req->rq_replen, &req->rq_repbuf);
 194         if (rc) {
 195                 printk("ost_create: cannot pack reply\n");
 196                 return rc;
 197         }
 198
 199         memcpy(&req->rq_rep.ost->oa, &req->rq_req.ost->oa, sizeof(req->rq_req.ost->oa));
 200
 201         req->rq_rep.ost->result =ost->ost_tgt->obd_type->typ_ops->o_create
 202                 (&conn, &req->rq_rep.ost->oa);
 203
 204         EXIT;
 205         return 0;
 206 }
 207
 208
 209 static int ost_setattr(struct ost_obd *ost, struct ptlrpc_request *req)
 210 {
 211         struct obd_conn conn;
 212         int rc;
 213
 214         ENTRY;
 215
 216         conn.oc_id = req->rq_req.ost->connid;
 217         conn.oc_dev = ost->ost_tgt;
 218
 219         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep.ost,
 220                           &req->rq_replen, &req->rq_repbuf);
 221         if (rc) {
 222                 printk("ost_setattr: cannot pack reply\n");
 223                 return rc;
 224         }
 225
 226         memcpy(&req->rq_rep.ost->oa, &req->rq_req.ost->oa, sizeof(req->rq_req.ost->oa));
 227
 228         req->rq_rep.ost->result =ost->ost_tgt->obd_type->typ_ops->o_setattr
 229                 (&conn, &req->rq_rep.ost->oa);
 230
 231         EXIT;
 232         return 0;
 233 }
 234
 235 static int ost_connect(struct ost_obd *ost, struct ptlrpc_request *req)
 236 {
 237         struct obd_conn conn;
 238         int rc;
 239
 240         ENTRY;
 241
 242         conn.oc_dev = ost->ost_tgt;
 243
 244         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep.ost,
 245                           &req->rq_replen, &req->rq_repbuf);
 246         if (rc) {
 247                 printk("ost_setattr: cannot pack reply\n");
 248                 return rc;
 249         }
 250
 251         req->rq_rep.ost->result =ost->ost_tgt->obd_type->typ_ops->o_connect(&conn);
 252
 253         printk("ost_connect: rep buffer %p, id %d\n", req->rq_repbuf,
 254                conn.oc_id);
 255         req->rq_rep.ost->connid = conn.oc_id;
 256         EXIT;
 257         return 0;
 258 }
 259
 260
 261 static int ost_disconnect(struct ost_obd *ost, struct ptlrpc_request *req)
 262 {
 263         struct obd_conn conn;
 264         int rc;
 265
 266         ENTRY;
 267
 268         conn.oc_dev = ost->ost_tgt;
 269         conn.oc_id = req->rq_req.ost->connid;
 270
 271         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep.ost,
 272                           &req->rq_replen, &req->rq_repbuf);
 273         if (rc) {
 274                 printk("ost_setattr: cannot pack reply\n");
 275                 return rc;
 276         }
 277
 278         req->rq_rep.ost->result =ost->ost_tgt->obd_type->typ_ops->o_disconnect(&conn);
 279
 280         EXIT;
 281         return 0;
 282 }
 283
 284 static int ost_get_info(struct ost_obd *ost, struct ptlrpc_request *req)
 285 {
 286         struct obd_conn conn;
 287         int rc;
 288         int vallen;
 289         void *val;
 290         char *ptr;
 291
 292         ENTRY;
 293
 294         conn.oc_id = req->rq_req.ost->connid;
 295         conn.oc_dev = ost->ost_tgt;
 296
 297         ptr = ost_req_buf1(req->rq_req.ost);
 298         req->rq_rep.ost->result =ost->ost_tgt->obd_type->typ_ops->o_get_info
 299                 (&conn, req->rq_req.ost->buflen1, ptr, &vallen, &val);
 300
 301         rc = ost_pack_rep(val, vallen, NULL, 0, &req->rq_rephdr, &req->rq_rep.ost,
 302                           &req->rq_replen, &req->rq_repbuf);
 303         if (rc) {
 304                 printk("ost_setattr: cannot pack reply\n");
 305                 return rc;
 306         }
 307
 308         EXIT;
 309         return 0;
 310 }
 311
 312
 313 #if 0
 314 static struct page * ext2_get_page(struct inode *dir, unsigned long n)
 315 {
 316         struct address_space *mapping = dir->i_mapping;
 317         struct page *page = read_cache_page(mapping, n,
 318                                 (filler_t*)mapping->a_ops->readpage, NULL);
 319         if (!IS_ERR(page)) {
 320                 wait_on_page(page);
 321                 kmap(page);
 322                 if (!Page_Uptodate(page))
 323                         goto fail;
 324                 if (!PageChecked(page))
 325                         ext2_check_page(page);
 326                 if (PageError(page))
 327                         goto fail;
 328         }
 329         return page;
 330
 331 fail:
 332         ext2_put_page(page);
 333         return ERR_PTR(-EIO);
 334 }
 335
 336 static inline void ext2_put_page(struct page *page)
 337 {
 338         kunmap(page);
 339         page_cache_release(page);
 340 }
 341
 342 /* Releases the page */
 343 void ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
 344                         struct page *page, struct inode *inode)
 345 {
 346         unsigned from = (char *) de - (char *) page_address(page);
 347         unsigned to = from + le16_to_cpu(de->rec_len);
 348         int err;
 349
 350         lock_page(page);
 351         err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
 352         if (err)
 353                 BUG();
 354         de->inode = cpu_to_le32(inode->i_ino);
 355         ext2_set_de_type (de, inode);
 356         dir->i_mtime = dir->i_ctime = CURRENT_TIME;
 357         err = ext2_commit_chunk(page, from, to);
 358         UnlockPage(page);
 359         ext2_put_page(page);
 360 }
 361
 362 static int ext2_commit_chunk(struct page *page, unsigned from, unsigned to)
 363 {
 364         struct inode *dir = page->mapping->host;
 365         int err = 0;
 366         dir->i_version = ++event;
 367         SetPageUptodate(page);
 368         set_page_clean(page);
 369
 370         //page->mapping->a_ops->commit_write(NULL, page, from, to);
 371         //if (IS_SYNC(dir))
 372         //      err = waitfor_one_page(page);
 373         return err;
 374 }
 375
 376 #endif
 377
 378 int ost_prepw(struct ost_obd *obddev, struct ptlrpc_request *req)
 379 {
 380 #if 0
 381         struct obd_conn conn;
 382         int rc;
 383         int i, j, n;
 384         int objcount;
 385         void *tmp;
 386         struct niobuf **nb;
 387         struct obd_ioo **ioo;
 388
 389         ENTRY;
 390
 391         tmp1 = ost_req_buf1(req);
 392         tmp2 = ost_req_buf2(req);
 393         objcount = req->buflen1 / sizeof(**ioo);
 394
 395         n = 0;
 396         for (i=0 ; i<objcount ; i++) {
 397                 obd_unpack_ioo
 398
 399         conn.oc_id = req->rq_req.ost->connid;
 400         conn.oc_dev = ost->ost_tgt;
 401
 402         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep,
 403                           &req->rq_replen, &req->rq_repbuf);
 404         if (rc) {
 405                 printk("ost_create: cannot pack reply\n");
 406                 return rc;
 407         }
 408
 409         memcpy(&req->rq_rep.ost->oa, &req->rq_req.ost->oa, sizeof(req->rq_req.ost->oa));
 410
 411         req->rq_rep.ost->result =ost->ost_tgt->obd_type->typ_ops->o_create
 412                 (&conn, &req->rq_rep.ost->oa);
 413
 414         EXIT;
 415         return 0;
 416 #endif
 417         return -ENOTSUPP;
 418
 419 }
 420
 421
 422 int ost_handle(struct obd_device *obddev, struct ptlrpc_request *req)
 423 {
 424         int rc;
 425         struct ost_obd *ost = &obddev->u.ost;
 426         struct ptlreq_hdr *hdr;
 427
 428         ENTRY;
 429         printk("ost_handle: req at %p\n", req);
 430
 431         hdr = (struct ptlreq_hdr *)req->rq_reqbuf;
 432         if (NTOH__u32(hdr->type) != OST_TYPE_REQ) {
 433                 printk("lustre_ost: wrong packet type sent %d\n",
 434                        NTOH__u32(hdr->type));
 435                 rc = -EINVAL;
 436                 goto out;
 437         }
 438
 439         rc = ost_unpack_req(req->rq_reqbuf, req->rq_reqlen,
 440                             &req->rq_reqhdr, &req->rq_req.ost);
 441         if (rc) {
 442                 printk("lustre_ost: Invalid request\n");
 443                 EXIT;
 444                 goto out;
 445         }
 446
 447         switch (req->rq_reqhdr->opc) {
 448
 449         case OST_CONNECT:
 450                 CDEBUG(D_INODE, "connect\n");
 451                 printk("----> connect \n");
 452                 rc = ost_connect(ost, req);
 453                 break;
 454         case OST_DISCONNECT:
 455                 CDEBUG(D_INODE, "disconnect\n");
 456                 rc = ost_disconnect(ost, req);
 457                 break;
 458         case OST_GET_INFO:
 459                 CDEBUG(D_INODE, "get_info\n");
 460                 rc = ost_get_info(ost, req);
 461                 break;
 462         case OST_CREATE:
 463                 CDEBUG(D_INODE, "create\n");
 464                 rc = ost_create(ost, req);
 465                 break;
 466         case OST_DESTROY:
 467                 CDEBUG(D_INODE, "destroy\n");
 468                 rc = ost_destroy(ost, req);
 469                 break;
 470         case OST_GETATTR:
 471                 CDEBUG(D_INODE, "getattr\n");
 472                 rc = ost_getattr(ost, req);
 473                 break;
 474         case OST_SETATTR:
 475                 CDEBUG(D_INODE, "setattr\n");
 476                 rc = ost_setattr(ost, req);
 477                 break;
 478         case OST_PREPW:
 479                 CDEBUG(D_INODE, "prepw\n");
 480                 rc = ost_prepw(ost, req);
 481                 break;
 482         default:
 483                 req->rq_status = -ENOTSUPP;
 484                 return ost_error(obddev, req);
 485         }
 486
 487 out:
 488         req->rq_status = rc;
 489         if (rc) {
 490                 printk("ost: processing error %d\n", rc);
 491                 ost_error(obddev, req);
 492         } else {
 493                 CDEBUG(D_INODE, "sending reply\n");
 494                 ost_reply(obddev, req);
 495         }
 496
 497         return 0;
 498 }
 499
 500 int ost_main(void *arg)
 501 {
 502         struct obd_device *obddev = (struct obd_device *) arg;
 503         struct ost_obd *ost = &obddev->u.ost;
 504         ENTRY;
 505         printk("---> %d\n", __LINE__);
 506
 507
 508         lock_kernel();
 509         printk("---> %d\n", __LINE__);
 510         daemonize();
 511         printk("---> %d\n", __LINE__);
 512         spin_lock_irq(&current->sigmask_lock);
 513         printk("---> %d\n", __LINE__);
 514         sigfillset(&current->blocked);
 515         printk("---> %d\n", __LINE__);
 516         recalc_sigpending(current);
 517         printk("---> %d\n", __LINE__);
 518         spin_unlock_irq(&current->sigmask_lock);
 519         printk("---> %d\n", __LINE__);
 520
 521         printk("---> %d\n", __LINE__);
 522         sprintf(current->comm, "lustre_ost");
 523         printk("---> %d\n", __LINE__);
 524
 525         /* Record that the  thread is running */
 526         ost->ost_thread = current;
 527         printk("---> %d\n", __LINE__);
 528         wake_up(&ost->ost_done_waitq);
 529         printk("---> %d\n", __LINE__);
 530
 531         /* XXX maintain a list of all managed devices: insert here */
 532
 533         /* And now, wait forever for commit wakeup events. */
 534         while (1) {
 535                 struct ptlrpc_request *request;
 536                 int rc;
 537
 538                 if (ost->ost_flags & OST_EXIT)
 539                         break;
 540
 541
 542                 wake_up(&ost->ost_done_waitq);
 543                 interruptible_sleep_on(&ost->ost_waitq);
 544
 545                 CDEBUG(D_INODE, "lustre_ost wakes\n");
 546                 CDEBUG(D_INODE, "pick up req here and continue\n");
 547
 548                 if (list_empty(&ost->ost_reqs)) {
 549                         CDEBUG(D_INODE, "woke because of timer\n");
 550                 } else {
 551                         printk("---> %d\n", __LINE__);
 552                         request = list_entry(ost->ost_reqs.next,
 553                                              struct ptlrpc_request, rq_list);
 554                         printk("---> %d\n", __LINE__);
 555                         list_del(&request->rq_list);
 556                         rc = ost_handle(obddev, request);
 557                 }
 558         }
 559
 560         /* XXX maintain a list of all managed devices: cleanup here */
 561         printk("---> %d\n", __LINE__);
 562         ost->ost_thread = NULL;
 563         printk("---> %d\n", __LINE__);
 564         wake_up(&ost->ost_done_waitq);
 565         printk("lustre_ost: exiting\n");
 566         return 0;
 567 }
 568
 569 static void ost_stop_srv_thread(struct ost_obd *ost)
 570 {
 571         ost->ost_flags |= OST_EXIT;
 572
 573         while (ost->ost_thread) {
 574                 wake_up(&ost->ost_waitq);
 575                 sleep_on(&ost->ost_done_waitq);
 576         }
 577 }
 578
 579 static void ost_start_srv_thread(struct obd_device *obd)
 580 {
 581         struct ost_obd *ost = &obd->u.ost;
 582         ENTRY;
 583
 584         init_waitqueue_head(&ost->ost_waitq);
 585         printk("---> %d\n", __LINE__);
 586         init_waitqueue_head(&ost->ost_done_waitq);
 587         printk("---> %d\n", __LINE__);
 588         kernel_thread(ost_main, (void *)obd,
 589                       CLONE_VM | CLONE_FS | CLONE_FILES);
 590         printk("---> %d\n", __LINE__);
 591         while (!ost->ost_thread)
 592                 sleep_on(&ost->ost_done_waitq);
 593         printk("---> %d\n", __LINE__);
 594         EXIT;
 595 }
 596
 597 /* mount the file system (secretly) */
 598 static int ost_setup(struct obd_device *obddev, obd_count len,
 599                         void *buf)
 600
 601 {
 602         struct obd_ioctl_data* data = buf;
 603         struct ost_obd *ost = &obddev->u.ost;
 604         struct obd_device *tgt;
 605         int err;
 606         ENTRY;
 607
 608         if (data->ioc_dev  < 0 || data->ioc_dev > MAX_OBD_DEVICES) {
 609                 EXIT;
 610                 return -ENODEV;
 611         }
 612
 613         tgt = &obd_dev[data->ioc_dev];
 614         ost->ost_tgt = tgt;
 615         if ( ! (tgt->obd_flags & OBD_ATTACHED) ||
 616              ! (tgt->obd_flags & OBD_SET_UP) ){
 617                 printk("device not attached or not set up (%d)\n",
 618                        data->ioc_dev);
 619                 EXIT;
 620                 return -EINVAL;
 621         }
 622
 623         ost->ost_conn.oc_dev = tgt;
 624         err = tgt->obd_type->typ_ops->o_connect(&ost->ost_conn);
 625         if (err) {
 626                 printk("lustre ost: fail to connect to device %d\n",
 627                        data->ioc_dev);
 628                 return -EINVAL;
 629         }
 630
 631         INIT_LIST_HEAD(&ost->ost_reqs);
 632         ost->ost_thread = NULL;
 633         ost->ost_flags = 0;
 634
 635         spin_lock_init(&obddev->u.ost.ost_lock);
 636
 637         ost_start_srv_thread(obddev);
 638
 639         MOD_INC_USE_COUNT;
 640         EXIT;
 641         return 0;
 642 }
 643
 644 static int ost_cleanup(struct obd_device * obddev)
 645 {
 646         struct ost_obd *ost = &obddev->u.ost;
 647         struct obd_device *tgt;
 648         int err;
 649
 650         ENTRY;
 651
 652         if ( !(obddev->obd_flags & OBD_SET_UP) ) {
 653                 EXIT;
 654                 return 0;
 655         }
 656
 657         if ( !list_empty(&obddev->obd_gen_clients) ) {
 658                 printk(KERN_WARNING __FUNCTION__ ": still has clients!\n");
 659                 EXIT;
 660                 return -EBUSY;
 661         }
 662
 663         ost_stop_srv_thread(ost);
 664
 665         if (!list_empty(&ost->ost_reqs)) {
 666                 // XXX reply with errors and clean up
 667                 CDEBUG(D_INODE, "Request list not empty!\n");
 668         }
 669
 670         tgt = ost->ost_tgt;
 671         err = tgt->obd_type->typ_ops->o_disconnect(&ost->ost_conn);
 672         if (err) {
 673                 printk("lustre ost: fail to disconnect device\n");
 674                 return -EINVAL;
 675         }
 676
 677
 678         MOD_DEC_USE_COUNT;
 679         EXIT;
 680         return 0;
 681 }
 682
 683 /* use obd ops to offer management infrastructure */
 684 static struct obd_ops ost_obd_ops = {
 685         o_setup:       ost_setup,
 686         o_cleanup:     ost_cleanup,
 687 };
 688
 689 static int __init ost_init(void)
 690 {
 691         obd_register_type(&ost_obd_ops, LUSTRE_OST_NAME);
 692         return 0;
 693 }
 694
 695 static void __exit ost_exit(void)
 696 {
 697         obd_unregister_type(LUSTRE_OST_NAME);
 698 }
 699
 700 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
 701 MODULE_DESCRIPTION("Lustre Object Storage Target (OST) v0.01");
 702 MODULE_LICENSE("GPL");
 703
 704 // for testing (maybe this stays)
 705 EXPORT_SYMBOL(ost_queue_req);
 706
 707 module_init(ost_init);
 708 module_exit(ost_exit);