lustre/ost/ost_handler.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 2001, 2002 Cluster File Systems, Inc.
   5  *   Author: Peter J. Braam <braam@clusterfs.com>
   6  *   Author: Phil Schwan <phil@clusterfs.com>
   7  *
   8  *   This file is part of Lustre, http://www.lustre.org.
   9  *
  10  *   Lustre is free software; you can redistribute it and/or
  11  *   modify it under the terms of version 2 of the GNU General Public
  12  *   License as published by the Free Software Foundation.
  13  *
  14  *   Lustre is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *   GNU General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU General Public License
  20  *   along with Lustre; if not, write to the Free Software
  21  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  *  Storage Target Handling functions
  24  *  Lustre Object Server Module (OST)
  25  *
  26  *  This server is single threaded at present (but can easily be multi
  27  *  threaded). For testing and management it is treated as an
  28  *  obd_device, although it does not export a full OBD method table
  29  *  (the requests are coming in over the wire, so object target
  30  *  modules do not have a full method table.)
  31  */
  32
  33 #define EXPORT_SYMTAB
  34
  35 #include <linux/version.h>
  36 #include <linux/module.h>
  37 #include <linux/fs.h>
  38 #include <linux/stat.h>
  39 #include <linux/locks.h>
  40 #include <linux/ext2_fs.h>
  41 #include <linux/quotaops.h>
  42 #include <asm/unistd.h>
  43
  44 #define DEBUG_SUBSYSTEM S_OST
  45
  46 #include <linux/obd_support.h>
  47 #include <linux/obd.h>
  48 #include <linux/obd_class.h>
  49 #include <linux/lustre_lib.h>
  50 #include <linux/lustre_idl.h>
  51 #include <linux/lustre_mds.h>
  52 #include <linux/obd_class.h>
  53
  54
  55
  56 static int ost_destroy(struct ost_obd *ost, struct ptlrpc_request *req)
  57 {
  58         struct obd_conn conn;
  59         int rc;
  60
  61         ENTRY;
  62
  63         conn.oc_id = req->rq_req.ost->connid;
  64         conn.oc_dev = ost->ost_tgt;
  65
  66         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep,
  67                           &req->rq_replen, &req->rq_repbuf);
  68         if (rc) {
  69                 CERROR("cannot pack reply\n");
  70                 return rc;
  71         }
  72
  73         req->rq_rep.ost->result = obd_destroy(&conn, &req->rq_req.ost->oa);
  74
  75         EXIT;
  76         return 0;
  77 }
  78
  79 static int ost_getattr(struct ost_obd *ost, struct ptlrpc_request *req)
  80 {
  81         struct obd_conn conn;
  82         int rc;
  83
  84         ENTRY;
  85
  86         conn.oc_id = req->rq_req.ost->connid;
  87         conn.oc_dev = ost->ost_tgt;
  88
  89         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep,
  90                           &req->rq_replen, &req->rq_repbuf);
  91         if (rc) {
  92                 CERROR("cannot pack reply\n");
  93                 return rc;
  94         }
  95         req->rq_rep.ost->oa.o_id = req->rq_req.ost->oa.o_id;
  96         req->rq_rep.ost->oa.o_valid = req->rq_req.ost->oa.o_valid;
  97
  98         req->rq_rep.ost->result =  obd_getattr(&conn, &req->rq_rep.ost->oa);
  99
 100         EXIT;
 101         return 0;
 102 }
 103
 104 static int ost_create(struct ost_obd *ost, struct ptlrpc_request *req)
 105 {
 106         struct obd_conn conn;
 107         int rc;
 108
 109         ENTRY;
 110
 111         conn.oc_id = req->rq_req.ost->connid;
 112         conn.oc_dev = ost->ost_tgt;
 113
 114         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep,
 115                           &req->rq_replen, &req->rq_repbuf);
 116         if (rc) {
 117                 CERROR("cannot pack reply\n");
 118                 return rc;
 119         }
 120
 121         memcpy(&req->rq_rep.ost->oa, &req->rq_req.ost->oa,
 122                sizeof(req->rq_req.ost->oa));
 123
 124         req->rq_rep.ost->result =obd_create(&conn, &req->rq_rep.ost->oa);
 125
 126         EXIT;
 127         return 0;
 128 }
 129
 130 static int ost_punch(struct ost_obd *ost, struct ptlrpc_request *req)
 131 {
 132         struct obd_conn conn;
 133         int rc;
 134
 135         ENTRY;
 136
 137         conn.oc_id = req->rq_req.ost->connid;
 138         conn.oc_dev = ost->ost_tgt;
 139
 140         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep,
 141                           &req->rq_replen, &req->rq_repbuf);
 142         if (rc) {
 143                 CERROR("cannot pack reply\n");
 144                 return rc;
 145         }
 146
 147         memcpy(&req->rq_rep.ost->oa, &req->rq_req.ost->oa,
 148                sizeof(req->rq_req.ost->oa));
 149
 150         req->rq_rep.ost->result = obd_punch(&conn, &req->rq_rep.ost->oa,
 151                                             req->rq_rep.ost->oa.o_size,
 152                                             req->rq_rep.ost->oa.o_blocks);
 153
 154         EXIT;
 155         return 0;
 156 }
 157
 158
 159 static int ost_setattr(struct ost_obd *ost, struct ptlrpc_request *req)
 160 {
 161         struct obd_conn conn;
 162         int rc;
 163
 164         ENTRY;
 165
 166         conn.oc_id = req->rq_req.ost->connid;
 167         conn.oc_dev = ost->ost_tgt;
 168
 169         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep,
 170                           &req->rq_replen, &req->rq_repbuf);
 171         if (rc) {
 172                 CERROR("cannot pack reply\n");
 173                 return rc;
 174         }
 175
 176         memcpy(&req->rq_rep.ost->oa, &req->rq_req.ost->oa,
 177                sizeof(req->rq_req.ost->oa));
 178
 179         req->rq_rep.ost->result = obd_setattr(&conn, &req->rq_rep.ost->oa);
 180
 181         EXIT;
 182         return 0;
 183 }
 184
 185 static int ost_connect(struct ost_obd *ost, struct ptlrpc_request *req)
 186 {
 187         struct obd_conn conn;
 188         int rc;
 189
 190         ENTRY;
 191
 192         conn.oc_dev = ost->ost_tgt;
 193
 194         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep,
 195                           &req->rq_replen, &req->rq_repbuf);
 196         if (rc) {
 197                 CERROR("cannot pack reply\n");
 198                 return rc;
 199         }
 200
 201         req->rq_rep.ost->result = obd_connect(&conn);
 202
 203         CDEBUG(D_IOCTL, "rep buffer %p, id %d\n", req->rq_repbuf, conn.oc_id);
 204         req->rq_rep.ost->connid = conn.oc_id;
 205         EXIT;
 206         return 0;
 207 }
 208
 209 static int ost_disconnect(struct ost_obd *ost, struct ptlrpc_request *req)
 210 {
 211         struct obd_conn conn;
 212         int rc;
 213
 214         ENTRY;
 215
 216         conn.oc_dev = ost->ost_tgt;
 217         conn.oc_id = req->rq_req.ost->connid;
 218
 219         rc = ost_pack_rep(NULL, 0, NULL, 0, &req->rq_rephdr, &req->rq_rep,
 220                           &req->rq_replen, &req->rq_repbuf);
 221         if (rc) {
 222                 CERROR("cannot pack reply\n");
 223                 return rc;
 224         }
 225         CDEBUG(D_IOCTL, "Disconnecting %d\n", conn.oc_id);
 226         req->rq_rep.ost->result = obd_disconnect(&conn);
 227
 228         EXIT;
 229         return 0;
 230 }
 231
 232 static int ost_get_info(struct ost_obd *ost, struct ptlrpc_request *req)
 233 {
 234         struct obd_conn conn;
 235         int rc;
 236         int vallen;
 237         void *val;
 238         char *ptr;
 239
 240         ENTRY;
 241
 242         conn.oc_id = req->rq_req.ost->connid;
 243         conn.oc_dev = ost->ost_tgt;
 244
 245         ptr = ost_req_buf1(req->rq_req.ost);
 246         req->rq_rep.ost->result = obd_get_info(&conn,
 247                                                req->rq_req.ost->buflen1, ptr,
 248                                                &vallen, &val);
 249
 250         rc = ost_pack_rep(val, vallen, NULL, 0, &req->rq_rephdr,
 251                           &req->rq_rep, &req->rq_replen, &req->rq_repbuf);
 252         if (rc) {
 253                 CERROR("cannot pack reply\n");
 254                 return rc;
 255         }
 256
 257         EXIT;
 258         return 0;
 259 }
 260
 261 int ost_brw(struct ost_obd *obddev, struct ptlrpc_request *req)
 262 {
 263         struct ptlrpc_bulk_desc **bulk_vec = NULL;
 264         struct ptlrpc_bulk_desc *bulk = NULL;
 265         struct obd_conn conn;
 266         int rc;
 267         int i, j;
 268         int objcount, niocount;
 269         char *tmp1, *tmp2, *end2;
 270         char *res;
 271         int cmd;
 272         struct niobuf *nb, *src, *dst;
 273         struct obd_ioobj *ioo;
 274         struct ost_req *r = req->rq_req.ost;
 275
 276         ENTRY;
 277
 278         tmp1 = ost_req_buf1(r);
 279         tmp2 = ost_req_buf2(r);
 280         end2 = tmp2 + req->rq_req.ost->buflen2;
 281         objcount = r->buflen1 / sizeof(*ioo);
 282         niocount = r->buflen2 / sizeof(*nb);
 283         cmd = r->cmd;
 284
 285         conn.oc_id = req->rq_req.ost->connid;
 286         conn.oc_dev = req->rq_obd->u.ost.ost_tgt;
 287
 288         for (i = 0; i < objcount; i++) {
 289                 ost_unpack_ioo((void *)&tmp1, &ioo);
 290                 if (tmp2 + ioo->ioo_bufcnt > end2) {
 291                         rc = -EFAULT;
 292                         break;
 293                 }
 294                 for (j = 0; j < ioo->ioo_bufcnt; j++) {
 295                         ost_unpack_niobuf((void *)&tmp2, &nb);
 296                 }
 297         }
 298
 299         rc = ost_pack_rep(NULL, 0, NULL, niocount * sizeof(*nb),
 300                           &req->rq_rephdr, &req->rq_rep,
 301                           &req->rq_replen, &req->rq_repbuf);
 302         if (rc) {
 303                 CERROR("cannot pack reply\n");
 304                 return rc;
 305         }
 306         OBD_ALLOC(res, sizeof(struct niobuf) * niocount);
 307         if (res == NULL) {
 308                 EXIT;
 309                 return -ENOMEM;
 310         }
 311
 312         /* The unpackers move tmp1 and tmp2, so reset them before using */
 313         tmp1 = ost_req_buf1(r);
 314         tmp2 = ost_req_buf2(r);
 315         req->rq_rep.ost->result = obd_preprw
 316                 (cmd, &conn, objcount, (struct obd_ioobj *)tmp1,
 317                  niocount, (struct niobuf *)tmp2, (struct niobuf *)res);
 318
 319         if (req->rq_rep.ost->result) {
 320                 EXIT;
 321                 goto out;
 322         }
 323
 324         if (cmd == OBD_BRW_WRITE) {
 325                 /* Setup buffers for the incoming pages, then send the niobufs
 326                  * describing those buffers to the OSC. */
 327                 OBD_ALLOC(bulk_vec,
 328                           niocount * sizeof(struct ptlrpc_bulk_desc *));
 329                 if (bulk_vec == NULL) {
 330                         CERROR("cannot alloc bulk desc vector\n");
 331                         return -ENOMEM;
 332                 }
 333                 memset(bulk_vec, 0,
 334                        niocount * sizeof(struct ptlrpc_bulk_desc *));
 335
 336                 for (i = 0; i < niocount; i++) {
 337                         struct ptlrpc_service *srv =
 338                                 req->rq_obd->u.ost.ost_service;
 339
 340                         bulk_vec[i] = ptlrpc_prep_bulk(&req->rq_peer);
 341                         if (bulk_vec[i] == NULL) {
 342                                 CERROR("cannot alloc bulk desc\n");
 343                                 rc = -ENOMEM;
 344                                 goto out;
 345                         }
 346
 347                         spin_lock(&srv->srv_lock);
 348                         bulk_vec[i]->b_xid = srv->srv_xid++;
 349                         spin_unlock(&srv->srv_lock);
 350
 351                         dst = &((struct niobuf *)res)[i];
 352                         /* FIXME: we overload ->page with the xid of this buffer
 353                          * for the benefit of the remote client */
 354                         dst->page =
 355                                 (void *)(unsigned long)HTON__u64(bulk_vec[i]->b_xid);
 356
 357                         bulk_vec[i]->b_buf = (void *)(unsigned long)dst->addr;
 358                         bulk_vec[i]->b_buflen = PAGE_SIZE;
 359                         bulk_vec[i]->b_portal = OSC_BULK_PORTAL;
 360                         rc = ptlrpc_wait_bulk(bulk_vec[i]);
 361                         if (rc)
 362                                 goto out;
 363
 364 #if 0
 365                         /* Local delivery */
 366                         src = &((struct niobuf *)tmp2)[i];
 367                         memcpy((void *)(unsigned long)dst->addr,
 368                                (void *)(unsigned long)src->addr, src->len);
 369 #endif
 370                 }
 371                 barrier();
 372         } else {
 373                 for (i = 0; i < niocount; i++) {
 374                         struct ptlrpc_service *srv =
 375                                 req->rq_obd->u.ost.ost_service;
 376
 377                         bulk = ptlrpc_prep_bulk(&req->rq_peer);
 378                         if (bulk == NULL) {
 379                                 CERROR("cannot alloc bulk desc\n");
 380                                 rc = -ENOMEM;
 381                                 goto out;
 382                         }
 383
 384                         spin_lock(&srv->srv_lock);
 385                         bulk->b_xid = srv->srv_xid++;
 386                         spin_unlock(&srv->srv_lock);
 387
 388                         src = &((struct niobuf *)tmp2)[i];
 389
 390                         bulk->b_buf = (void *)(unsigned long)src->addr;
 391                         bulk->b_buflen = PAGE_SIZE;
 392                         rc = ptlrpc_send_bulk(bulk, OST_BULK_PORTAL);
 393                         if (rc) {
 394                                 EXIT;
 395                                 goto out;
 396                         }
 397                         wait_event_interruptible(bulk->b_waitq,
 398                                                  ptlrpc_check_bulk_sent(bulk));
 399
 400                         if (bulk->b_flags == PTL_RPC_INTR) {
 401                                 EXIT;
 402                                 goto out;
 403                         }
 404
 405                         OBD_FREE(bulk, sizeof(*bulk));
 406                 }
 407
 408 #if 0
 409                 /* Local delivery */
 410                 dst = &((struct niobuf *)tmp2)[i];
 411                 memcpy((void *)(unsigned long)dst->addr,
 412                        (void *)(unsigned long)src->addr, PAGE_SIZE);
 413 #endif
 414                 barrier();
 415         }
 416
 417  out:
 418         if (bulk != NULL)
 419                 OBD_FREE(bulk, sizeof(*bulk));
 420         if (bulk_vec != NULL) {
 421                 for (i = 0; i < niocount; i++) {
 422                         if (bulk_vec[i] != NULL)
 423                                 OBD_FREE(bulk_vec[i], sizeof(*bulk));
 424                 }
 425                 OBD_FREE(bulk_vec,
 426                          niocount * sizeof(struct ptlrpc_bulk_desc *));
 427         }
 428
 429         EXIT;
 430         return 0;
 431 }
 432
 433 int ost_brw_complete(struct ost_obd *obddev, struct ptlrpc_request *req)
 434 {
 435         struct obd_conn conn;
 436         int rc, i, j, cmd;
 437         int objcount, niocount;
 438         char *tmp1, *tmp2, *end2;
 439         struct niobuf *nb;
 440         struct obd_ioobj *ioo;
 441         struct ost_req *r = req->rq_req.ost;
 442
 443         ENTRY;
 444
 445         tmp1 = ost_req_buf1(r);
 446         tmp2 = ost_req_buf2(r);
 447         end2 = tmp2 + req->rq_req.ost->buflen2;
 448         objcount = r->buflen1 / sizeof(*ioo);
 449         niocount = r->buflen2 / sizeof(*nb);
 450         cmd = r->cmd;
 451
 452         conn.oc_id = req->rq_req.ost->connid;
 453         conn.oc_dev = req->rq_obd->u.ost.ost_tgt;
 454
 455         for (i = 0; i < objcount; i++) {
 456                 ost_unpack_ioo((void *)&tmp1, &ioo);
 457                 if (tmp2 + ioo->ioo_bufcnt > end2) {
 458                         rc = -EFAULT;
 459                         break;
 460                 }
 461                 for (j = 0; j < ioo->ioo_bufcnt; j++) {
 462                         ost_unpack_niobuf((void *)&tmp2, &nb);
 463                 }
 464         }
 465
 466         rc = ost_pack_rep(NULL, 0, NULL, 0,
 467                           &req->rq_rephdr, &req->rq_rep,
 468                           &req->rq_replen, &req->rq_repbuf);
 469         if (rc) {
 470                 CERROR("cannot pack reply\n");
 471                 return rc;
 472         }
 473
 474         /* The unpackers move tmp1 and tmp2, so reset them before using */
 475         tmp1 = ost_req_buf1(r);
 476         tmp2 = ost_req_buf2(r);
 477         req->rq_rep.ost->result = obd_commitrw
 478                 (cmd, &conn, objcount, (struct obd_ioobj *)tmp1,
 479                  niocount, (struct niobuf *)tmp2);
 480
 481         return 0;
 482 }
 483
 484 static int ost_handle(struct obd_device *obddev,
 485                struct ptlrpc_service *svc,
 486                struct ptlrpc_request *req)
 487 {
 488         int rc;
 489         struct ost_obd *ost = &obddev->u.ost;
 490         struct ptlreq_hdr *hdr;
 491
 492         ENTRY;
 493
 494         hdr = (struct ptlreq_hdr *)req->rq_reqbuf;
 495         if (NTOH__u32(hdr->type) != OST_TYPE_REQ) {
 496                 CERROR("lustre_ost: wrong packet type sent %d\n",
 497                        NTOH__u32(hdr->type));
 498                 rc = -EINVAL;
 499                 goto out;
 500         }
 501
 502         rc = ost_unpack_req(req->rq_reqbuf, req->rq_reqlen,
 503                             &req->rq_reqhdr, &req->rq_req);
 504         if (rc) {
 505                 CERROR("lustre_ost: Invalid request\n");
 506                 EXIT;
 507                 goto out;
 508         }
 509
 510         switch (req->rq_reqhdr->opc) {
 511
 512         case OST_CONNECT:
 513                 CDEBUG(D_INODE, "connect\n");
 514                 rc = ost_connect(ost, req);
 515                 break;
 516         case OST_DISCONNECT:
 517                 CDEBUG(D_INODE, "disconnect\n");
 518                 rc = ost_disconnect(ost, req);
 519                 break;
 520         case OST_GET_INFO:
 521                 CDEBUG(D_INODE, "get_info\n");
 522                 rc = ost_get_info(ost, req);
 523                 break;
 524         case OST_CREATE:
 525                 CDEBUG(D_INODE, "create\n");
 526                 rc = ost_create(ost, req);
 527                 break;
 528         case OST_DESTROY:
 529                 CDEBUG(D_INODE, "destroy\n");
 530                 rc = ost_destroy(ost, req);
 531                 break;
 532         case OST_GETATTR:
 533                 CDEBUG(D_INODE, "getattr\n");
 534                 rc = ost_getattr(ost, req);
 535                 break;
 536         case OST_SETATTR:
 537                 CDEBUG(D_INODE, "setattr\n");
 538                 rc = ost_setattr(ost, req);
 539                 break;
 540         case OST_BRW:
 541                 CDEBUG(D_INODE, "brw\n");
 542                 rc = ost_brw(ost, req);
 543                 break;
 544         case OST_BRW_COMPLETE:
 545                 CDEBUG(D_INODE, "brw_complete\n");
 546                 rc = ost_brw_complete(ost, req);
 547                 break;
 548         case OST_PUNCH:
 549                 CDEBUG(D_INODE, "punch\n");
 550                 rc = ost_punch(ost, req);
 551                 break;
 552         default:
 553                 req->rq_status = -ENOTSUPP;
 554                 return ptlrpc_error(obddev, svc, req);
 555         }
 556
 557 out:
 558         req->rq_status = rc;
 559         if (rc) {
 560                 CERROR("ost: processing error %d\n", rc);
 561                 ptlrpc_error(obddev, svc, req);
 562         } else {
 563                 CDEBUG(D_INODE, "sending reply\n");
 564                 ptlrpc_reply(obddev, svc, req);
 565         }
 566
 567         return 0;
 568 }
 569
 570
 571 /* mount the file system (secretly) */
 572 static int ost_setup(struct obd_device *obddev, obd_count len,
 573                         void *buf)
 574
 575 {
 576         struct obd_ioctl_data* data = buf;
 577         struct ost_obd *ost = &obddev->u.ost;
 578         struct obd_device *tgt;
 579         int err;
 580         ENTRY;
 581
 582         if (data->ioc_dev  < 0 || data->ioc_dev > MAX_OBD_DEVICES) {
 583                 EXIT;
 584                 return -ENODEV;
 585         }
 586
 587         tgt = &obd_dev[data->ioc_dev];
 588         ost->ost_tgt = tgt;
 589         if ( ! (tgt->obd_flags & OBD_ATTACHED) ||
 590              ! (tgt->obd_flags & OBD_SET_UP) ){
 591                 CERROR("device not attached or not set up (%d)\n",
 592                        data->ioc_dev);
 593                 EXIT;
 594                 return -EINVAL;
 595         }
 596
 597         ost->ost_conn.oc_dev = tgt;
 598         err = obd_connect(&ost->ost_conn);
 599         if (err) {
 600                 CERROR("fail to connect to device %d\n", data->ioc_dev);
 601                 return -EINVAL;
 602         }
 603
 604         ost->ost_service = ptlrpc_init_svc( 64 * 1024,
 605                                             OST_REQUEST_PORTAL,
 606                                             OSC_REPLY_PORTAL,
 607                                             "self",
 608                                             ost_unpack_req,
 609                                             ost_pack_rep,
 610                                             ost_handle);
 611         if (!ost->ost_service) {
 612                 obd_disconnect(&ost->ost_conn);
 613                 return -EINVAL;
 614         }
 615
 616         rpc_register_service(ost->ost_service, "self");
 617
 618         err = ptlrpc_start_thread(obddev, ost->ost_service, "lustre_ost");
 619         if (err) {
 620                 obd_disconnect(&ost->ost_conn);
 621                 return -EINVAL;
 622         }
 623
 624         MOD_INC_USE_COUNT;
 625         EXIT;
 626         return 0;
 627 }
 628
 629 static int ost_cleanup(struct obd_device * obddev)
 630 {
 631         struct ost_obd *ost = &obddev->u.ost;
 632         int err;
 633
 634         ENTRY;
 635
 636         if ( !list_empty(&obddev->obd_gen_clients) ) {
 637                 CERROR("still has clients!\n");
 638                 EXIT;
 639                 return -EBUSY;
 640         }
 641
 642         ptlrpc_stop_thread(ost->ost_service);
 643         rpc_unregister_service(ost->ost_service);
 644
 645         if (!list_empty(&ost->ost_service->srv_reqs)) {
 646                 // XXX reply with errors and clean up
 647                 CERROR("Request list not empty!\n");
 648         }
 649         OBD_FREE(ost->ost_service, sizeof(*ost->ost_service));
 650
 651         err = obd_disconnect(&ost->ost_conn);
 652         if (err) {
 653                 CERROR("lustre ost: fail to disconnect device\n");
 654                 return -EINVAL;
 655         }
 656
 657         MOD_DEC_USE_COUNT;
 658         EXIT;
 659         return 0;
 660 }
 661
 662 /* use obd ops to offer management infrastructure */
 663 static struct obd_ops ost_obd_ops = {
 664         o_setup:       ost_setup,
 665         o_cleanup:     ost_cleanup,
 666 };
 667
 668 static int __init ost_init(void)
 669 {
 670         obd_register_type(&ost_obd_ops, LUSTRE_OST_NAME);
 671         return 0;
 672 }
 673
 674 static void __exit ost_exit(void)
 675 {
 676         obd_unregister_type(LUSTRE_OST_NAME);
 677 }
 678
 679 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
 680 MODULE_DESCRIPTION("Lustre Object Storage Target (OST) v0.01");
 681 MODULE_LICENSE("GPL");
 682
 683 module_init(ost_init);
 684 module_exit(ost_exit);