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, 2002 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
  15  *  threaded). For testing and management it is treated as an
  16  *  obd_device, although it does not export a full OBD method table
  17  *  (the requests are coming in over the wire, so object target
  18  *  modules do not have a full method table.)
  19  *
  20  */
  21
  22
  23 #define EXPORT_SYMTAB
  24
  25 #include <linux/version.h>
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/stat.h>
  29 #include <linux/locks.h>
  30 #include <linux/ext2_fs.h>
  31 #include <linux/quotaops.h>
  32 #include <asm/unistd.h>
  33 #include <linux/obd_support.h>
  34 #include <linux/obd.h>
  35 #include <linux/obd_class.h>
  36 #include <linux/lustre_lib.h>
  37 #include <linux/lustre_idl.h>
  38 #include <linux/lustre_mds.h>
  39 #include <linux/obd_class.h>
  40
  41 // for testing
  42 static int ost_queue_req(struct obd_device *obddev, struct ptlrpc_request *req)
  43 {
  44         struct ptlrpc_request *srv_req;
  45         struct ost_obd *ost = &obddev->u.ost;
  46
  47         if (!ost) {
  48                 EXIT;
  49                 return -1;
  50         }
  51
  52         OBD_ALLOC(srv_req, sizeof(*srv_req));
  53         if (!srv_req) {
  54                 EXIT;
  55                 return -ENOMEM;
  56         }
  57
  58         printk("---> OST at %d %p, incoming req %p, srv_req %p\n",
  59                __LINE__, ost, req, srv_req);
  60
  61         memset(srv_req, 0, sizeof(*req));
  62
  63         /* move the request buffer */
  64         srv_req->rq_reqbuf = req->rq_reqbuf;
  65         srv_req->rq_reqlen    = req->rq_reqlen;
  66         srv_req->rq_ost = ost;
  67
  68         /* remember where it came from */
  69         srv_req->rq_reply_handle = req;
  70
  71         list_add(&srv_req->rq_list, &ost->ost_reqs);
  72         wake_up(&ost->ost_waitq);
  73         return 0;
  74 }
  75
  76 int ost_reply(struct obd_device *obddev, struct ptlrpc_request *req)
  77 {
  78         struct ptlrpc_request *clnt_req = req->rq_reply_handle;
  79
  80         ENTRY;
  81
  82         if (req->rq_ost->ost_service != NULL) {
  83                 /* This is a request that came from the network via portals. */
  84
  85                 /* FIXME: we need to increment the count of handled events */
  86                 ptl_send_buf(req, &req->rq_peer, OST_REPLY_PORTAL, 0);
  87         } else {
  88                 /* This is a local request that came from another thread. */
  89
  90                 /* move the reply to the client */
  91                 clnt_req->rq_replen = req->rq_replen;
  92                 clnt_req->rq_repbuf = req->rq_repbuf;
  93                 req->rq_repbuf = NULL;
  94                 req->rq_replen = 0;
  95
  96                 /* free the request buffer */
  97                 OBD_FREE(req->rq_reqbuf, req->rq_reqlen);
  98                 req->rq_reqbuf = NULL;
  99
 100                 /* wake up the client */
 101                 wake_up_interruptible(&clnt_req->rq_wait_for_rep);
 102         }
 103
 104         EXIT;
 105         return 0;
 106 }
 107
 108 int ost_error(struct obd_device *obddev, struct ptlrpc_request *req)
 109 {
 110         struct ptlrep_hdr *hdr;
 111
 112         ENTRY;
 113
 114         OBD_ALLOC(hdr, sizeof(*hdr));
 115         if (!hdr) {
 116                 EXIT;
 117                 return -ENOMEM;
 118         }
 119
 120         memset(hdr, 0, sizeof(*hdr));
 121
 122         hdr->seqno = req->rq_reqhdr->seqno;
 123         hdr->status = req->rq_status;
 124         hdr->type = OST_TYPE_ERR;
 125
 126         req->rq_repbuf = (char *)hdr;
 127         req->rq_replen = sizeof(*hdr);
 128
 129         EXIT;
 130         return ost_reply(obddev, req);
 131 }
 132
 133 static int ost_destroy(struct ost_obd *ost, struct ptlrpc_request *req)
 134 {
 135         struct obd_conn conn;
 136         int rc;
 137
 138         ENTRY;
 139
 140         conn.oc_id = req->rq_req.ost->connid;
 141         conn.oc_dev = ost->ost_tgt;
 142
 143         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep.ost,
 144                           &req->rq_replen, &req->rq_repbuf);
 145         if (rc) {
 146                 printk("ost_destroy: cannot pack reply\n");
 147                 return rc;
 148         }
 149
 150         req->rq_rep.ost->result =ost->ost_tgt->obd_type->typ_ops->o_destroy
 151                 (&conn, &req->rq_req.ost->oa);
 152
 153         EXIT;
 154         return 0;
 155 }
 156
 157 static int ost_getattr(struct ost_obd *ost, struct ptlrpc_request *req)
 158 {
 159         struct obd_conn conn;
 160         int rc;
 161
 162         ENTRY;
 163         printk("ost getattr entered\n");
 164
 165         conn.oc_id = req->rq_req.ost->connid;
 166         conn.oc_dev = ost->ost_tgt;
 167
 168         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep.ost,
 169                           &req->rq_replen, &req->rq_repbuf);
 170         if (rc) {
 171                 printk("ost_getattr: cannot pack reply\n");
 172                 return rc;
 173         }
 174         req->rq_rep.ost->oa.o_id = req->rq_req.ost->oa.o_id;
 175         req->rq_rep.ost->oa.o_valid = req->rq_req.ost->oa.o_valid;
 176
 177         req->rq_rep.ost->result =ost->ost_tgt->obd_type->typ_ops->o_getattr
 178                 (&conn, &req->rq_rep.ost->oa);
 179
 180         EXIT;
 181         return 0;
 182 }
 183
 184 static int ost_create(struct ost_obd *ost, struct ptlrpc_request *req)
 185 {
 186         struct obd_conn conn;
 187         int rc;
 188
 189         ENTRY;
 190
 191         conn.oc_id = req->rq_req.ost->connid;
 192         conn.oc_dev = ost->ost_tgt;
 193
 194         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep.ost,
 195                           &req->rq_replen, &req->rq_repbuf);
 196         if (rc) {
 197                 printk("ost_create: cannot pack reply\n");
 198                 return rc;
 199         }
 200
 201         memcpy(&req->rq_rep.ost->oa, &req->rq_req.ost->oa, sizeof(req->rq_req.ost->oa));
 202
 203         req->rq_rep.ost->result =ost->ost_tgt->obd_type->typ_ops->o_create
 204                 (&conn, &req->rq_rep.ost->oa);
 205
 206         EXIT;
 207         return 0;
 208 }
 209
 210
 211 static int ost_setattr(struct ost_obd *ost, struct ptlrpc_request *req)
 212 {
 213         struct obd_conn conn;
 214         int rc;
 215
 216         ENTRY;
 217
 218         conn.oc_id = req->rq_req.ost->connid;
 219         conn.oc_dev = ost->ost_tgt;
 220
 221         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep.ost,
 222                           &req->rq_replen, &req->rq_repbuf);
 223         if (rc) {
 224                 printk("ost_setattr: cannot pack reply\n");
 225                 return rc;
 226         }
 227
 228         memcpy(&req->rq_rep.ost->oa, &req->rq_req.ost->oa,
 229                sizeof(req->rq_req.ost->oa));
 230
 231         req->rq_rep.ost->result =ost->ost_tgt->obd_type->typ_ops->o_setattr
 232                 (&conn, &req->rq_rep.ost->oa);
 233
 234         EXIT;
 235         return 0;
 236 }
 237
 238 static int ost_connect(struct ost_obd *ost, struct ptlrpc_request *req)
 239 {
 240         struct obd_conn conn;
 241         int rc;
 242
 243         ENTRY;
 244
 245         conn.oc_dev = ost->ost_tgt;
 246
 247         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep.ost,
 248                           &req->rq_replen, &req->rq_repbuf);
 249         if (rc) {
 250                 printk("ost_setattr: cannot pack reply\n");
 251                 return rc;
 252         }
 253
 254         req->rq_rep.ost->result =ost->ost_tgt->obd_type->typ_ops->o_connect(&conn);
 255
 256         printk("ost_connect: rep buffer %p, id %d\n", req->rq_repbuf,
 257                conn.oc_id);
 258         req->rq_rep.ost->connid = conn.oc_id;
 259         EXIT;
 260         return 0;
 261 }
 262
 263 static int ost_disconnect(struct ost_obd *ost, struct ptlrpc_request *req)
 264 {
 265         struct obd_conn conn;
 266         int rc;
 267
 268         ENTRY;
 269
 270         conn.oc_dev = ost->ost_tgt;
 271         conn.oc_id = req->rq_req.ost->connid;
 272
 273         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep.ost,
 274                           &req->rq_replen, &req->rq_repbuf);
 275         if (rc) {
 276                 printk("ost_setattr: cannot pack reply\n");
 277                 return rc;
 278         }
 279
 280         req->rq_rep.ost->result =ost->ost_tgt->obd_type->typ_ops->o_disconnect(&conn);
 281
 282         EXIT;
 283         return 0;
 284 }
 285
 286 static int ost_get_info(struct ost_obd *ost, struct ptlrpc_request *req)
 287 {
 288         struct obd_conn conn;
 289         int rc;
 290         int vallen;
 291         void *val;
 292         char *ptr;
 293
 294         ENTRY;
 295
 296         conn.oc_id = req->rq_req.ost->connid;
 297         conn.oc_dev = ost->ost_tgt;
 298
 299         ptr = ost_req_buf1(req->rq_req.ost);
 300         req->rq_rep.ost->result =ost->ost_tgt->obd_type->typ_ops->o_get_info
 301                 (&conn, req->rq_req.ost->buflen1, ptr, &vallen, &val);
 302
 303         rc = ost_pack_rep(val, vallen, NULL, 0, &req->rq_rephdr, &req->rq_rep.ost,
 304                           &req->rq_replen, &req->rq_repbuf);
 305         if (rc) {
 306                 printk("ost_setattr: cannot pack reply\n");
 307                 return rc;
 308         }
 309
 310         EXIT;
 311         return 0;
 312 }
 313
 314 int ost_brw(struct ost_obd *obddev, struct ptlrpc_request *req)
 315 {
 316         struct obd_conn conn;
 317         int rc;
 318         int i, j;
 319         int objcount, niocount;
 320         char *tmp1, *tmp2, *end2;
 321         char *res;
 322         int cmd;
 323         struct niobuf *nb, *src, *dst;
 324         struct obd_ioobj *ioo;
 325         struct ost_req *r = req->rq_req.ost;
 326
 327         ENTRY;
 328
 329         tmp1 = ost_req_buf1(r);
 330         tmp2 = ost_req_buf2(r);
 331         end2 = tmp2 + req->rq_req.ost->buflen2;
 332         objcount = r->buflen1 / sizeof(*ioo);
 333         niocount = r->buflen2 / sizeof(*nb);
 334         cmd = r->cmd;
 335
 336         conn.oc_id = req->rq_req.ost->connid;
 337         conn.oc_dev = req->rq_ost->ost_tgt;
 338
 339         rc = ost_pack_rep(NULL, niocount, NULL, 0,
 340                           &req->rq_rephdr, &req->rq_rep.ost,
 341                           &req->rq_replen, &req->rq_repbuf);
 342         if (rc) {
 343                 printk("ost_create: cannot pack reply\n");
 344                 return rc;
 345         }
 346         res = ost_rep_buf1(req->rq_rep.ost);
 347
 348         for (i=0; i < objcount; i++) {
 349                 ost_unpack_ioo((void *)&tmp1, &ioo);
 350                 if (tmp2 + ioo->ioo_bufcnt > end2) {
 351                         rc = -EFAULT;
 352                         break;
 353                 }
 354                 for (j = 0 ; j < ioo->ioo_bufcnt ; j++) {
 355                         ost_unpack_niobuf((void *)&tmp2, &nb);
 356                 }
 357         }
 358
 359         /* The unpackers move tmp1 and tmp2, so reset them before using */
 360         tmp1 = ost_req_buf1(r);
 361         tmp2 = ost_req_buf2(r);
 362         req->rq_rep.ost->result =
 363                 req->rq_ost->ost_tgt->obd_type->typ_ops->o_preprw
 364                 (cmd, &conn, objcount, (struct obd_ioobj *)tmp1,
 365                  niocount, (struct niobuf *)tmp2, (struct niobuf *)res);
 366
 367         if (cmd == OBD_BRW_WRITE) {
 368                 for (i=0; i<niocount; i++) {
 369                         src = &((struct niobuf *)tmp2)[i];
 370                         dst = &((struct niobuf *)res)[i];
 371                         memcpy((void *)(unsigned long)dst->addr,
 372                                (void *)(unsigned long)src->addr,
 373                                src->len);
 374                 }
 375         } else {
 376                 for (i=0; i<niocount; i++) {
 377                         dst = &((struct niobuf *)tmp2)[i];
 378                         src = &((struct niobuf *)res)[i];
 379                         memcpy((void *)(unsigned long)dst->addr,
 380                                (void *)(unsigned long)src->addr,
 381                                PAGE_SIZE);
 382                 }
 383         }
 384
 385         req->rq_rep.ost->result =
 386                 req->rq_ost->ost_tgt->obd_type->typ_ops->o_commitrw
 387                 (cmd, &conn, objcount, (struct obd_ioobj *)tmp1,
 388                  niocount, (struct niobuf *)res);
 389
 390         EXIT;
 391         return 0;
 392 }
 393
 394 int ost_handle(struct obd_device *obddev, struct ptlrpc_request *req)
 395 {
 396         int rc;
 397         struct ost_obd *ost = &obddev->u.ost;
 398         struct ptlreq_hdr *hdr;
 399
 400         ENTRY;
 401         printk("ost_handle: req at %p\n", req);
 402
 403         hdr = (struct ptlreq_hdr *)req->rq_reqbuf;
 404         if (NTOH__u32(hdr->type) != OST_TYPE_REQ) {
 405                 printk("lustre_ost: wrong packet type sent %d\n",
 406                        NTOH__u32(hdr->type));
 407                 rc = -EINVAL;
 408                 goto out;
 409         }
 410
 411         rc = ost_unpack_req(req->rq_reqbuf, req->rq_reqlen,
 412                             &req->rq_reqhdr, &req->rq_req.ost);
 413         if (rc) {
 414                 printk("lustre_ost: Invalid request\n");
 415                 EXIT;
 416                 goto out;
 417         }
 418
 419         switch (req->rq_reqhdr->opc) {
 420
 421         case OST_CONNECT:
 422                 CDEBUG(D_INODE, "connect\n");
 423                 rc = ost_connect(ost, req);
 424                 break;
 425         case OST_DISCONNECT:
 426                 CDEBUG(D_INODE, "disconnect\n");
 427                 rc = ost_disconnect(ost, req);
 428                 break;
 429         case OST_GET_INFO:
 430                 CDEBUG(D_INODE, "get_info\n");
 431                 rc = ost_get_info(ost, req);
 432                 break;
 433         case OST_CREATE:
 434                 CDEBUG(D_INODE, "create\n");
 435                 rc = ost_create(ost, req);
 436                 break;
 437         case OST_DESTROY:
 438                 CDEBUG(D_INODE, "destroy\n");
 439                 rc = ost_destroy(ost, req);
 440                 break;
 441         case OST_GETATTR:
 442                 CDEBUG(D_INODE, "getattr\n");
 443                 rc = ost_getattr(ost, req);
 444                 break;
 445         case OST_SETATTR:
 446                 CDEBUG(D_INODE, "setattr\n");
 447                 rc = ost_setattr(ost, req);
 448                 break;
 449         case OST_BRW:
 450                 CDEBUG(D_INODE, "brw\n");
 451                 rc = ost_brw(ost, req);
 452                 break;
 453         default:
 454                 req->rq_status = -ENOTSUPP;
 455                 return ost_error(obddev, req);
 456         }
 457
 458 out:
 459         req->rq_status = rc;
 460         if (rc) {
 461                 printk("ost: processing error %d\n", rc);
 462                 ost_error(obddev, req);
 463         } else {
 464                 CDEBUG(D_INODE, "sending reply\n");
 465                 ost_reply(obddev, req);
 466         }
 467
 468         return 0;
 469 }
 470
 471 int ost_main(void *arg)
 472 {
 473         struct obd_device *obddev = (struct obd_device *) arg;
 474         struct ost_obd *ost = &obddev->u.ost;
 475         ENTRY;
 476
 477         lock_kernel();
 478         daemonize();
 479         spin_lock_irq(&current->sigmask_lock);
 480         sigfillset(&current->blocked);
 481         recalc_sigpending(current);
 482         spin_unlock_irq(&current->sigmask_lock);
 483
 484         sprintf(current->comm, "lustre_ost");
 485
 486         /* Record that the  thread is running */
 487         ost->ost_thread = current;
 488         wake_up(&ost->ost_done_waitq);
 489
 490         /* XXX maintain a list of all managed devices: insert here */
 491
 492         /* And now, wait forever for commit wakeup events. */
 493         while (1) {
 494                 int rc;
 495
 496                 if (ost->ost_flags & OST_EXIT)
 497                         break;
 498
 499                 wake_up(&ost->ost_done_waitq);
 500                 interruptible_sleep_on(&ost->ost_waitq);
 501
 502                 CDEBUG(D_INODE, "lustre_ost wakes\n");
 503                 CDEBUG(D_INODE, "pick up req here and continue\n");
 504
 505
 506                 if (ost->ost_service != NULL) {
 507                         ptl_event_t ev;
 508
 509                         while (1) {
 510                                 struct ptlrpc_request request;
 511                                 struct ptlrpc_service *service;
 512
 513                                 rc = PtlEQGet(ost->ost_service->srv_eq_h, &ev);
 514                                 if (rc != PTL_OK && rc != PTL_EQ_DROPPED)
 515                                         break;
 516
 517                                 service = (struct ptlrpc_service *)ev.mem_desc.user_ptr;
 518
 519                                 /* FIXME: If we move to an event-driven model,
 520                                  * we should put the request on the stack of
 521                                  * mds_handle instead. */
 522                                 memset(&request, 0, sizeof(request));
 523                                 request.rq_reqbuf = ev.mem_desc.start +
 524                                         ev.offset;
 525                                 request.rq_reqlen = ev.mem_desc.length;
 526                                 request.rq_ost = ost;
 527                                 request.rq_xid = ev.match_bits;
 528
 529                                 request.rq_peer.peer_nid = ev.initiator.nid;
 530                                 /* FIXME: this NI should be the incoming NI.
 531                                  * We don't know how to find that from here. */
 532                                 request.rq_peer.peer_ni =
 533                                         ost->ost_service->srv_self.peer_ni;
 534                                 rc = ost_handle(obddev, &request);
 535
 536                                 /* Inform the rpc layer the event has been handled */
 537                                 ptl_received_rpc(service);
 538                         }
 539                 } else {
 540                         struct ptlrpc_request *request;
 541
 542                         if (list_empty(&ost->ost_reqs)) {
 543                                 CDEBUG(D_INODE, "woke because of timer\n");
 544                         } else {
 545                                 request = list_entry(ost->ost_reqs.next,
 546                                                      struct ptlrpc_request,
 547                                                      rq_list);
 548                                 list_del(&request->rq_list);
 549                                 rc = ost_handle(obddev, request);
 550                         }
 551                 }
 552         }
 553
 554         /* XXX maintain a list of all managed devices: cleanup here */
 555
 556         ost->ost_thread = NULL;
 557         wake_up(&ost->ost_done_waitq);
 558         printk("lustre_ost: exiting\n");
 559         return 0;
 560 }
 561
 562 static void ost_stop_srv_thread(struct ost_obd *ost)
 563 {
 564         ost->ost_flags |= OST_EXIT;
 565
 566         while (ost->ost_thread) {
 567                 wake_up(&ost->ost_waitq);
 568                 sleep_on(&ost->ost_done_waitq);
 569         }
 570 }
 571
 572 static void ost_start_srv_thread(struct obd_device *obd)
 573 {
 574         struct ost_obd *ost = &obd->u.ost;
 575         ENTRY;
 576
 577         init_waitqueue_head(&ost->ost_waitq);
 578         init_waitqueue_head(&ost->ost_done_waitq);
 579         kernel_thread(ost_main, (void *)obd,
 580                       CLONE_VM | CLONE_FS | CLONE_FILES);
 581         while (!ost->ost_thread)
 582                 sleep_on(&ost->ost_done_waitq);
 583         EXIT;
 584 }
 585
 586 /* mount the file system (secretly) */
 587 static int ost_setup(struct obd_device *obddev, obd_count len,
 588                         void *buf)
 589
 590 {
 591         struct obd_ioctl_data* data = buf;
 592         struct ost_obd *ost = &obddev->u.ost;
 593         struct obd_device *tgt;
 594         struct lustre_peer peer;
 595         int err;
 596         ENTRY;
 597
 598         if (data->ioc_dev  < 0 || data->ioc_dev > MAX_OBD_DEVICES) {
 599                 EXIT;
 600                 return -ENODEV;
 601         }
 602
 603         tgt = &obd_dev[data->ioc_dev];
 604         ost->ost_tgt = tgt;
 605         if ( ! (tgt->obd_flags & OBD_ATTACHED) ||
 606              ! (tgt->obd_flags & OBD_SET_UP) ){
 607                 printk("device not attached or not set up (%d)\n",
 608                        data->ioc_dev);
 609                 EXIT;
 610                 return -EINVAL;
 611         }
 612
 613         ost->ost_conn.oc_dev = tgt;
 614         err = tgt->obd_type->typ_ops->o_connect(&ost->ost_conn);
 615         if (err) {
 616                 printk("lustre ost: fail to connect to device %d\n",
 617                        data->ioc_dev);
 618                 return -EINVAL;
 619         }
 620
 621         INIT_LIST_HEAD(&ost->ost_reqs);
 622         ost->ost_thread = NULL;
 623         ost->ost_flags = 0;
 624
 625         spin_lock_init(&obddev->u.ost.ost_lock);
 626
 627         err = kportal_uuid_to_peer("self", &peer);
 628         if (err == 0) {
 629                 OBD_ALLOC(ost->ost_service, sizeof(*ost->ost_service));
 630                 if (ost->ost_service == NULL)
 631                         return -ENOMEM;
 632                 ost->ost_service->srv_buf_size = 64 * 1024;
 633                 ost->ost_service->srv_portal = OST_REQUEST_PORTAL;
 634                 memcpy(&ost->ost_service->srv_self, &peer, sizeof(peer));
 635                 ost->ost_service->srv_wait_queue = &ost->ost_waitq;
 636
 637                 rpc_register_service(ost->ost_service, "self");
 638         }
 639
 640         ost_start_srv_thread(obddev);
 641
 642         MOD_INC_USE_COUNT;
 643         EXIT;
 644         return 0;
 645 }
 646
 647 static int ost_cleanup(struct obd_device * obddev)
 648 {
 649         struct ost_obd *ost = &obddev->u.ost;
 650         struct obd_device *tgt;
 651         int err;
 652
 653         ENTRY;
 654
 655         if ( !(obddev->obd_flags & OBD_SET_UP) ) {
 656                 EXIT;
 657                 return 0;
 658         }
 659
 660         if ( !list_empty(&obddev->obd_gen_clients) ) {
 661                 printk(KERN_WARNING __FUNCTION__ ": still has clients!\n");
 662                 EXIT;
 663                 return -EBUSY;
 664         }
 665
 666         ost_stop_srv_thread(ost);
 667         rpc_unregister_service(ost->ost_service);
 668         OBD_FREE(ost->ost_service, sizeof(*ost->ost_service));
 669
 670         if (!list_empty(&ost->ost_reqs)) {
 671                 // XXX reply with errors and clean up
 672                 CDEBUG(D_INODE, "Request list not empty!\n");
 673         }
 674
 675         tgt = ost->ost_tgt;
 676         err = tgt->obd_type->typ_ops->o_disconnect(&ost->ost_conn);
 677         if (err) {
 678                 printk("lustre ost: fail to disconnect device\n");
 679                 return -EINVAL;
 680         }
 681
 682
 683         MOD_DEC_USE_COUNT;
 684         EXIT;
 685         return 0;
 686 }
 687
 688 /* use obd ops to offer management infrastructure */
 689 static struct obd_ops ost_obd_ops = {
 690         o_setup:       ost_setup,
 691         o_cleanup:     ost_cleanup,
 692 };
 693
 694 static int __init ost_init(void)
 695 {
 696         obd_register_type(&ost_obd_ops, LUSTRE_OST_NAME);
 697         return 0;
 698 }
 699
 700 static void __exit ost_exit(void)
 701 {
 702         obd_unregister_type(LUSTRE_OST_NAME);
 703 }
 704
 705 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
 706 MODULE_DESCRIPTION("Lustre Object Storage Target (OST) v0.01");
 707 MODULE_LICENSE("GPL");
 708
 709 // for testing (maybe this stays)
 710 EXPORT_SYMBOL(ost_queue_req);
 711
 712 module_init(ost_init);
 713 module_exit(ost_exit);