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 #define DEBUG_SUBSYSTEM S_OST
  35
  36 #include <linux/module.h>
  37 #include <linux/obd_ost.h>
  38 #include <linux/lustre_net.h>
  39 #include <linux/lustre_dlm.h>
  40
  41 static int ost_destroy(struct ptlrpc_request *req)
  42 {
  43         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
  44         struct ost_body *body;
  45         int rc, size = sizeof(*body);
  46         ENTRY;
  47
  48         body = lustre_msg_buf(req->rq_reqmsg, 0);
  49
  50         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
  51         if (rc)
  52                 RETURN(rc);
  53
  54         req->rq_status = obd_destroy(conn, &body->oa);
  55         RETURN(0);
  56 }
  57
  58 static int ost_getattr(struct ptlrpc_request *req)
  59 {
  60         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
  61         struct ost_body *body, *repbody;
  62         int rc, size = sizeof(*body);
  63         ENTRY;
  64
  65         body = lustre_msg_buf(req->rq_reqmsg, 0);
  66
  67         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
  68         if (rc)
  69                 RETURN(rc);
  70
  71         repbody = lustre_msg_buf(req->rq_repmsg, 0);
  72         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
  73         req->rq_status = obd_getattr(conn, &repbody->oa);
  74         RETURN(0);
  75 }
  76
  77 static int ost_statfs(struct ptlrpc_request *req)
  78 {
  79         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
  80         struct obd_statfs *osfs;
  81         struct statfs sfs;
  82         int rc, size = sizeof(*osfs);
  83         ENTRY;
  84
  85         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
  86         if (rc)
  87                 RETURN(rc);
  88
  89         rc = obd_statfs(conn, &sfs);
  90         if (rc) {
  91                 CERROR("ost: statfs failed: rc %d\n", rc);
  92                 GOTO(out, rc);
  93         }
  94         osfs = lustre_msg_buf(req->rq_repmsg, 0);
  95         memset(osfs, 0, size);
  96         obd_statfs_pack(osfs, &sfs);
  97 out:
  98         req->rq_status = rc;
  99         RETURN(0);
 100 }
 101
 102 static int ost_open(struct ptlrpc_request *req)
 103 {
 104         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 105         struct ost_body *body, *repbody;
 106         int rc, size = sizeof(*body);
 107         ENTRY;
 108
 109         body = lustre_msg_buf(req->rq_reqmsg, 0);
 110
 111         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 112         if (rc)
 113                 RETURN(rc);
 114
 115         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 116         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 117         req->rq_status = obd_open(conn, &repbody->oa);
 118         RETURN(0);
 119 }
 120
 121 static int ost_close(struct ptlrpc_request *req)
 122 {
 123         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 124         struct ost_body *body, *repbody;
 125         int rc, size = sizeof(*body);
 126         ENTRY;
 127
 128         body = lustre_msg_buf(req->rq_reqmsg, 0);
 129
 130         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 131         if (rc)
 132                 RETURN(rc);
 133
 134         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 135         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 136         req->rq_status = obd_close(conn, &repbody->oa);
 137         RETURN(0);
 138 }
 139
 140 static int ost_create(struct ptlrpc_request *req)
 141 {
 142         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 143         struct ost_body *body, *repbody;
 144         int rc, size = sizeof(*body);
 145         ENTRY;
 146
 147         body = lustre_msg_buf(req->rq_reqmsg, 0);
 148
 149         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 150         if (rc)
 151                 RETURN(rc);
 152
 153         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 154         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 155         req->rq_status = obd_create(conn, &repbody->oa);
 156         RETURN(0);
 157 }
 158
 159 static int ost_punch(struct ptlrpc_request *req)
 160 {
 161         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 162         struct ost_body *body, *repbody;
 163         int rc, size = sizeof(*body);
 164         ENTRY;
 165
 166         body = lustre_msg_buf(req->rq_reqmsg, 0);
 167
 168         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 169         if (rc)
 170                 RETURN(rc);
 171
 172         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 173         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 174         req->rq_status = obd_punch(conn, &repbody->oa,
 175                                    repbody->oa.o_blocks, repbody->oa.o_size);
 176         RETURN(0);
 177 }
 178
 179 static int ost_setattr(struct ptlrpc_request *req)
 180 {
 181         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 182         struct ost_body *body, *repbody;
 183         int rc, size = sizeof(*body);
 184         ENTRY;
 185
 186         body = lustre_msg_buf(req->rq_reqmsg, 0);
 187
 188         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 189         if (rc)
 190                 RETURN(rc);
 191
 192         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 193         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 194         req->rq_status = obd_setattr(conn, &repbody->oa);
 195         RETURN(0);
 196 }
 197
 198 static int ost_brw_read(struct ptlrpc_request *req)
 199 {
 200         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 201         struct ptlrpc_bulk_desc *desc;
 202         void *tmp1, *tmp2, *end2;
 203         struct niobuf_remote *remote_nb;
 204         struct niobuf_local *local_nb = NULL;
 205         struct obd_ioobj *ioo;
 206         struct ost_body *body;
 207         int rc, cmd, i, j, objcount, niocount, size = sizeof(*body);
 208         ENTRY;
 209
 210         body = lustre_msg_buf(req->rq_reqmsg, 0);
 211         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 212         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 213         end2 = (char *)tmp2 + req->rq_reqmsg->buflens[2];
 214         objcount = req->rq_reqmsg->buflens[1] / sizeof(*ioo);
 215         niocount = req->rq_reqmsg->buflens[2] / sizeof(*remote_nb);
 216         cmd = body->data;
 217
 218         for (i = 0; i < objcount; i++) {
 219                 ost_unpack_ioo(&tmp1, &ioo);
 220                 if (tmp2 + ioo->ioo_bufcnt > end2) {
 221                         LBUG();
 222                         GOTO(out, rc = -EFAULT);
 223                 }
 224                 for (j = 0; j < ioo->ioo_bufcnt; j++)
 225                         ost_unpack_niobuf(&tmp2, &remote_nb);
 226         }
 227
 228         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 229         if (rc)
 230                 RETURN(rc);
 231         OBD_ALLOC(local_nb, sizeof(*local_nb) * niocount);
 232         if (local_nb == NULL)
 233                 RETURN(-ENOMEM);
 234
 235         /* The unpackers move tmp1 and tmp2, so reset them before using */
 236         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 237         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 238         req->rq_status = obd_preprw(cmd, conn, objcount,
 239                                     tmp1, niocount, tmp2, local_nb, NULL);
 240
 241         if (req->rq_status)
 242                 GOTO(out_local, 0);
 243
 244         desc = ptlrpc_prep_bulk(req->rq_connection);
 245         if (desc == NULL)
 246                 GOTO(out_local, rc = -ENOMEM);
 247         desc->b_portal = OST_BULK_PORTAL;
 248
 249         for (i = 0; i < niocount; i++) {
 250                 struct ptlrpc_bulk_page *bulk;
 251                 bulk = ptlrpc_prep_bulk_page(desc);
 252                 if (bulk == NULL)
 253                         GOTO(out_bulk, rc = -ENOMEM);
 254                 remote_nb = &(((struct niobuf_remote *)tmp2)[i]);
 255                 bulk->b_xid = remote_nb->xid;
 256                 bulk->b_buf = (void *)(unsigned long)local_nb[i].addr;
 257                 bulk->b_buflen = PAGE_SIZE;
 258         }
 259
 260         rc = ptlrpc_send_bulk(desc);
 261         if (rc)
 262                 GOTO(out_bulk, rc);
 263
 264         wait_event_interruptible(desc->b_waitq, ptlrpc_check_bulk_sent(desc));
 265         if (desc->b_flags & PTL_RPC_FL_INTR)
 266                 rc = -EINTR;
 267
 268         /* The unpackers move tmp1 and tmp2, so reset them before using */
 269         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 270         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 271         req->rq_status = obd_commitrw(cmd, conn, objcount,
 272                                       tmp1, niocount, local_nb, NULL);
 273
 274 out_bulk:
 275         ptlrpc_free_bulk(desc);
 276 out_local:
 277         OBD_FREE(local_nb, sizeof(*local_nb) * niocount);
 278 out:
 279         if (rc)
 280                 ptlrpc_error(req->rq_svc, req);
 281         else
 282                 ptlrpc_reply(req->rq_svc, req);
 283         RETURN(rc);
 284 }
 285
 286 static int ost_brw_write(struct ptlrpc_request *req)
 287 {
 288         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 289         struct ptlrpc_bulk_desc *desc;
 290         struct niobuf_remote *remote_nb;
 291         struct niobuf_local *local_nb, *lnb;
 292         struct obd_ioobj *ioo;
 293         struct ost_body *body;
 294         int cmd, rc, i, j, objcount, niocount, size[2] = {sizeof(*body)};
 295         void *tmp1, *tmp2, *end2;
 296         void *desc_priv = NULL;
 297         int reply_sent = 0;
 298         ENTRY;
 299
 300         body = lustre_msg_buf(req->rq_reqmsg, 0);
 301         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 302         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 303         end2 = (char *)tmp2 + req->rq_reqmsg->buflens[2];
 304         objcount = req->rq_reqmsg->buflens[1] / sizeof(*ioo);
 305         niocount = req->rq_reqmsg->buflens[2] / sizeof(*remote_nb);
 306         cmd = body->data;
 307
 308         for (i = 0; i < objcount; i++) {
 309                 ost_unpack_ioo((void *)&tmp1, &ioo);
 310                 if (tmp2 + ioo->ioo_bufcnt > end2) {
 311                         rc = -EFAULT;
 312                         break;
 313                 }
 314                 for (j = 0; j < ioo->ioo_bufcnt; j++)
 315                         ost_unpack_niobuf((void *)&tmp2, &remote_nb);
 316         }
 317
 318         size[1] = niocount * sizeof(*remote_nb);
 319         rc = lustre_pack_msg(2, size, NULL, &req->rq_replen, &req->rq_repmsg);
 320         if (rc)
 321                 GOTO(out, rc);
 322         remote_nb = lustre_msg_buf(req->rq_repmsg, 1);
 323
 324         OBD_ALLOC(local_nb, niocount * sizeof(*local_nb));
 325         if (local_nb == NULL)
 326                 GOTO(out, rc = -ENOMEM);
 327
 328         /* The unpackers move tmp1 and tmp2, so reset them before using */
 329         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 330         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 331         req->rq_status = obd_preprw(cmd, conn, objcount,
 332                                     tmp1, niocount, tmp2, local_nb, &desc_priv);
 333         if (req->rq_status)
 334                 GOTO(out_free, rc = 0); /* XXX is this correct? */
 335
 336         desc = ptlrpc_prep_bulk(req->rq_connection);
 337         if (desc == NULL)
 338                 GOTO(fail_preprw, rc = -ENOMEM);
 339         desc->b_cb = NULL;
 340         desc->b_portal = OSC_BULK_PORTAL;
 341         desc->b_desc_private = desc_priv;
 342         memcpy(&(desc->b_conn), &conn, sizeof(conn));
 343
 344         for (i = 0, lnb = local_nb; i < niocount; i++, lnb++) {
 345                 struct ptlrpc_service *srv = req->rq_obd->u.ost.ost_service;
 346                 struct ptlrpc_bulk_page *bulk;
 347
 348                 bulk = ptlrpc_prep_bulk_page(desc);
 349                 if (bulk == NULL)
 350                         GOTO(fail_bulk, rc = -ENOMEM);
 351
 352                 spin_lock(&srv->srv_lock);
 353                 bulk->b_xid = srv->srv_xid++;
 354                 spin_unlock(&srv->srv_lock);
 355
 356                 bulk->b_buf = lnb->addr;
 357                 bulk->b_page = lnb->page;
 358                 bulk->b_flags = lnb->flags;
 359                 bulk->b_dentry = lnb->dentry;
 360                 bulk->b_buflen = PAGE_SIZE;
 361                 bulk->b_cb = NULL;
 362
 363                 /* this advances remote_nb */
 364                 ost_pack_niobuf((void **)&remote_nb, lnb->offset, lnb->len, 0,
 365                                 bulk->b_xid);
 366         }
 367
 368         rc = ptlrpc_register_bulk(desc);
 369         if (rc)
 370                 GOTO(fail_bulk, rc);
 371
 372         reply_sent = 1;
 373         ptlrpc_reply(req->rq_svc, req);
 374
 375         wait_event_interruptible(desc->b_waitq,
 376                                  desc->b_flags & PTL_BULK_FL_RCVD);
 377
 378         rc = obd_commitrw(cmd, conn, objcount, tmp1, niocount, local_nb,
 379                           desc->b_desc_private);
 380         ptlrpc_free_bulk(desc);
 381         EXIT;
 382 out_free:
 383         OBD_FREE(local_nb, niocount * sizeof(*local_nb));
 384 out:
 385         if (!reply_sent) {
 386                 if (rc)
 387                         ptlrpc_error(req->rq_svc, req);
 388                 else
 389                         ptlrpc_reply(req->rq_svc, req);
 390         }
 391         return rc;
 392
 393 fail_bulk:
 394         ptlrpc_free_bulk(desc);
 395 fail_preprw:
 396         /* FIXME: how do we undo the preprw? */
 397         goto out_free;
 398 }
 399
 400 static int ost_brw(struct ptlrpc_request *req)
 401 {
 402         struct ost_body *body = lustre_msg_buf(req->rq_reqmsg, 0);
 403
 404         if (body->data & OBD_BRW_WRITE)
 405                 return ost_brw_write(req);
 406         else
 407                 return ost_brw_read(req);
 408 }
 409
 410
 411 static int ost_handle(struct ptlrpc_request *req)
 412 {
 413         int rc;
 414         ENTRY;
 415
 416         rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
 417         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_HANDLE_UNPACK)) {
 418                 CERROR("lustre_mds: Invalid request\n");
 419                 GOTO(out, rc);
 420         }
 421
 422         if (req->rq_reqmsg->type != PTL_RPC_MSG_REQUEST) {
 423                 CERROR("lustre_mds: wrong packet type sent %d\n",
 424                        req->rq_reqmsg->type);
 425                 GOTO(out, rc = -EINVAL);
 426         }
 427
 428         if (req->rq_reqmsg->opc != OST_CONNECT &&
 429             req->rq_export == NULL)
 430                 GOTO(out, rc = -ENOTCONN);
 431
 432         if (strcmp(req->rq_obd->obd_type->typ_name, "ost") != 0)
 433                 GOTO(out, rc = -EINVAL);
 434
 435         switch (req->rq_reqmsg->opc) {
 436         case OST_CONNECT:
 437                 CDEBUG(D_INODE, "connect\n");
 438                 OBD_FAIL_RETURN(OBD_FAIL_OST_CONNECT_NET, 0);
 439                 rc = target_handle_connect(req);
 440                 break;
 441         case OST_DISCONNECT:
 442                 CDEBUG(D_INODE, "disconnect\n");
 443                 OBD_FAIL_RETURN(OBD_FAIL_OST_DISCONNECT_NET, 0);
 444                 rc = target_handle_disconnect(req);
 445                 break;
 446         case OST_CREATE:
 447                 CDEBUG(D_INODE, "create\n");
 448                 OBD_FAIL_RETURN(OBD_FAIL_OST_CREATE_NET, 0);
 449                 rc = ost_create(req);
 450                 break;
 451         case OST_DESTROY:
 452                 CDEBUG(D_INODE, "destroy\n");
 453                 OBD_FAIL_RETURN(OBD_FAIL_OST_DESTROY_NET, 0);
 454                 rc = ost_destroy(req);
 455                 break;
 456         case OST_GETATTR:
 457                 CDEBUG(D_INODE, "getattr\n");
 458                 OBD_FAIL_RETURN(OBD_FAIL_OST_GETATTR_NET, 0);
 459                 rc = ost_getattr(req);
 460                 break;
 461         case OST_SETATTR:
 462                 CDEBUG(D_INODE, "setattr\n");
 463                 OBD_FAIL_RETURN(OBD_FAIL_OST_SETATTR_NET, 0);
 464                 rc = ost_setattr(req);
 465                 break;
 466         case OST_OPEN:
 467                 CDEBUG(D_INODE, "setattr\n");
 468                 OBD_FAIL_RETURN(OBD_FAIL_OST_OPEN_NET, 0);
 469                 rc = ost_open(req);
 470                 break;
 471         case OST_CLOSE:
 472                 CDEBUG(D_INODE, "setattr\n");
 473                 OBD_FAIL_RETURN(OBD_FAIL_OST_CLOSE_NET, 0);
 474                 rc = ost_close(req);
 475                 break;
 476         case OST_BRW:
 477                 CDEBUG(D_INODE, "brw\n");
 478                 OBD_FAIL_RETURN(OBD_FAIL_OST_BRW_NET, 0);
 479                 rc = ost_brw(req);
 480                 /* ost_brw sends its own replies */
 481                 RETURN(rc);
 482         case OST_PUNCH:
 483                 CDEBUG(D_INODE, "punch\n");
 484                 OBD_FAIL_RETURN(OBD_FAIL_OST_PUNCH_NET, 0);
 485                 rc = ost_punch(req);
 486                 break;
 487         case OST_STATFS:
 488                 CDEBUG(D_INODE, "statfs\n");
 489                 OBD_FAIL_RETURN(OBD_FAIL_OST_STATFS_NET, 0);
 490                 rc = ost_statfs(req);
 491                 break;
 492         default:
 493                 req->rq_status = -ENOTSUPP;
 494                 rc = ptlrpc_error(req->rq_svc, req);
 495                 RETURN(rc);
 496         }
 497
 498         EXIT;
 499 out:
 500         //req->rq_status = rc;
 501         if (rc) {
 502                 CERROR("ost: processing error %d\n", rc);
 503                 ptlrpc_error(req->rq_svc, req);
 504         } else {
 505                 CDEBUG(D_INODE, "sending reply\n");
 506                 ptlrpc_reply(req->rq_svc, req);
 507         }
 508
 509         return 0;
 510 }
 511
 512 #define OST_NUM_THREADS 6
 513
 514 /* mount the file system (secretly) */
 515 static int ost_setup(struct obd_device *obddev, obd_count len, void *buf)
 516 {
 517         struct obd_ioctl_data* data = buf;
 518         struct ost_obd *ost = &obddev->u.ost;
 519         struct obd_device *tgt;
 520         int err;
 521         int i;
 522         ENTRY;
 523
 524         if (data->ioc_dev < 0 || data->ioc_dev > MAX_OBD_DEVICES)
 525                 RETURN(-ENODEV);
 526
 527         MOD_INC_USE_COUNT;
 528         tgt = &obd_dev[data->ioc_dev];
 529         if (!(tgt->obd_flags & OBD_ATTACHED) ||
 530             !(tgt->obd_flags & OBD_SET_UP)) {
 531                 CERROR("device not attached or not set up (%d)\n",
 532                        data->ioc_dev);
 533                 GOTO(error_dec, err = -EINVAL);
 534         }
 535
 536         err = obd_connect(&ost->ost_conn, tgt);
 537         if (err) {
 538                 CERROR("fail to connect to device %d\n", data->ioc_dev);
 539                 GOTO(error_dec, err = -EINVAL);
 540         }
 541
 542         ost->ost_service = ptlrpc_init_svc(64 * 1024, OST_REQUEST_PORTAL,
 543                                            OSC_REPLY_PORTAL, "self",ost_handle);
 544         if (!ost->ost_service) {
 545                 CERROR("failed to start service\n");
 546                 GOTO(error_disc, err = -EINVAL);
 547         }
 548
 549         for (i = 0; i < OST_NUM_THREADS; i++) {
 550                 err = ptlrpc_start_thread(obddev, ost->ost_service,
 551                                           "lustre_ost");
 552                 if (err) {
 553                         CERROR("error starting thread #%d: rc %d\n", i, err);
 554                         GOTO(error_disc, err = -EINVAL);
 555                 }
 556         }
 557
 558         RETURN(0);
 559
 560 error_disc:
 561         obd_disconnect(&ost->ost_conn);
 562 error_dec:
 563         MOD_DEC_USE_COUNT;
 564         RETURN(err);
 565 }
 566
 567 static int ost_cleanup(struct obd_device * obddev)
 568 {
 569         struct ost_obd *ost = &obddev->u.ost;
 570         int err;
 571
 572         ENTRY;
 573
 574         if ( !list_empty(&obddev->obd_exports) ) {
 575                 CERROR("still has clients!\n");
 576                 RETURN(-EBUSY);
 577         }
 578
 579         ptlrpc_stop_all_threads(ost->ost_service);
 580         ptlrpc_unregister_service(ost->ost_service);
 581
 582         err = obd_disconnect(&ost->ost_conn);
 583         if (err) {
 584                 CERROR("lustre ost: fail to disconnect device\n");
 585                 RETURN(-EINVAL);
 586         }
 587
 588         MOD_DEC_USE_COUNT;
 589         RETURN(0);
 590 }
 591
 592 /* use obd ops to offer management infrastructure */
 593 static struct obd_ops ost_obd_ops = {
 594         o_setup:       ost_setup,
 595         o_cleanup:     ost_cleanup,
 596 };
 597
 598 static int __init ost_init(void)
 599 {
 600         class_register_type(&ost_obd_ops, LUSTRE_OST_NAME);
 601         return 0;
 602 }
 603
 604 static void __exit ost_exit(void)
 605 {
 606         class_unregister_type(LUSTRE_OST_NAME);
 607 }
 608
 609 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 610 MODULE_DESCRIPTION("Lustre Object Storage Target (OST) v0.01");
 611 MODULE_LICENSE("GPL");
 612
 613 module_init(ost_init);
 614 module_exit(ost_exit);