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 = obd_statfs(conn, &sfs);
  86         if (rc) {
  87                 CERROR("ost: statfs failed: rc %d\n", rc);
  88                 req->rq_status = rc;
  89                 RETURN(rc);
  90         }
  91
  92         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
  93         if (rc)
  94                 RETURN(rc);
  95
  96         osfs = lustre_msg_buf(req->rq_repmsg, 0);
  97         memset(osfs, 0, size);
  98         obd_statfs_pack(osfs, &sfs);
  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 #warning OST must time out here.
 265         wait_event(desc->b_waitq, ptlrpc_check_bulk_sent(desc));
 266         if (desc->b_flags & PTL_RPC_FL_INTR)
 267                 rc = -EINTR;
 268
 269         /* The unpackers move tmp1 and tmp2, so reset them before using */
 270         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 271         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 272         req->rq_status = obd_commitrw(cmd, conn, objcount,
 273                                       tmp1, niocount, local_nb, NULL);
 274
 275 out_bulk:
 276         ptlrpc_free_bulk(desc);
 277 out_local:
 278         OBD_FREE(local_nb, sizeof(*local_nb) * niocount);
 279 out:
 280         if (rc)
 281                 ptlrpc_error(req->rq_svc, req);
 282         else
 283                 ptlrpc_reply(req->rq_svc, req);
 284         RETURN(rc);
 285 }
 286
 287 static int ost_brw_write(struct ptlrpc_request *req)
 288 {
 289         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 290         struct ptlrpc_bulk_desc *desc;
 291         struct niobuf_remote *remote_nb;
 292         struct niobuf_local *local_nb, *lnb;
 293         struct obd_ioobj *ioo;
 294         struct ost_body *body;
 295         int cmd, rc, i, j, objcount, niocount, size[2] = {sizeof(*body)};
 296         void *tmp1, *tmp2, *end2;
 297         void *desc_priv = NULL;
 298         int reply_sent = 0;
 299         ENTRY;
 300
 301         body = lustre_msg_buf(req->rq_reqmsg, 0);
 302         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 303         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 304         end2 = (char *)tmp2 + req->rq_reqmsg->buflens[2];
 305         objcount = req->rq_reqmsg->buflens[1] / sizeof(*ioo);
 306         niocount = req->rq_reqmsg->buflens[2] / sizeof(*remote_nb);
 307         cmd = body->data;
 308
 309         for (i = 0; i < objcount; i++) {
 310                 ost_unpack_ioo((void *)&tmp1, &ioo);
 311                 if (tmp2 + ioo->ioo_bufcnt > end2) {
 312                         rc = -EFAULT;
 313                         break;
 314                 }
 315                 for (j = 0; j < ioo->ioo_bufcnt; j++)
 316                         ost_unpack_niobuf((void *)&tmp2, &remote_nb);
 317         }
 318
 319         size[1] = niocount * sizeof(*remote_nb);
 320         rc = lustre_pack_msg(2, size, NULL, &req->rq_replen, &req->rq_repmsg);
 321         if (rc)
 322                 GOTO(out, rc);
 323         remote_nb = lustre_msg_buf(req->rq_repmsg, 1);
 324
 325         OBD_ALLOC(local_nb, niocount * sizeof(*local_nb));
 326         if (local_nb == NULL)
 327                 GOTO(out, rc = -ENOMEM);
 328
 329         /* The unpackers move tmp1 and tmp2, so reset them before using */
 330         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 331         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 332         req->rq_status = obd_preprw(cmd, conn, objcount,
 333                                     tmp1, niocount, tmp2, local_nb, &desc_priv);
 334         if (req->rq_status)
 335                 GOTO(out_free, rc = 0); /* XXX is this correct? */
 336
 337         desc = ptlrpc_prep_bulk(req->rq_connection);
 338         if (desc == NULL)
 339                 GOTO(fail_preprw, rc = -ENOMEM);
 340         desc->b_cb = NULL;
 341         desc->b_portal = OSC_BULK_PORTAL;
 342         desc->b_desc_private = desc_priv;
 343         memcpy(&(desc->b_conn), &conn, sizeof(conn));
 344
 345         for (i = 0, lnb = local_nb; i < niocount; i++, lnb++) {
 346                 struct ptlrpc_service *srv = req->rq_obd->u.ost.ost_service;
 347                 struct ptlrpc_bulk_page *bulk;
 348
 349                 bulk = ptlrpc_prep_bulk_page(desc);
 350                 if (bulk == NULL)
 351                         GOTO(fail_bulk, rc = -ENOMEM);
 352
 353                 spin_lock(&srv->srv_lock);
 354                 bulk->b_xid = srv->srv_xid++;
 355                 spin_unlock(&srv->srv_lock);
 356
 357                 bulk->b_buf = lnb->addr;
 358                 bulk->b_page = lnb->page;
 359                 bulk->b_flags = lnb->flags;
 360                 bulk->b_dentry = lnb->dentry;
 361                 bulk->b_buflen = PAGE_SIZE;
 362                 bulk->b_cb = NULL;
 363
 364                 /* this advances remote_nb */
 365                 ost_pack_niobuf((void **)&remote_nb, lnb->offset, lnb->len, 0,
 366                                 bulk->b_xid);
 367         }
 368
 369         rc = ptlrpc_register_bulk(desc);
 370         if (rc)
 371                 GOTO(fail_bulk, rc);
 372
 373         reply_sent = 1;
 374         ptlrpc_reply(req->rq_svc, req);
 375
 376 #warning OST must time out here.
 377         wait_event(desc->b_waitq, desc->b_flags & PTL_BULK_FL_RCVD);
 378
 379         rc = obd_commitrw(cmd, conn, objcount, tmp1, niocount, local_nb,
 380                           desc->b_desc_private);
 381         ptlrpc_free_bulk(desc);
 382         EXIT;
 383 out_free:
 384         OBD_FREE(local_nb, niocount * sizeof(*local_nb));
 385 out:
 386         if (!reply_sent) {
 387                 if (rc)
 388                         ptlrpc_error(req->rq_svc, req);
 389                 else
 390                         ptlrpc_reply(req->rq_svc, req);
 391         }
 392         return rc;
 393
 394 fail_bulk:
 395         ptlrpc_free_bulk(desc);
 396 fail_preprw:
 397         /* FIXME: how do we undo the preprw? */
 398         goto out_free;
 399 }
 400
 401 static int ost_brw(struct ptlrpc_request *req)
 402 {
 403         struct ost_body *body = lustre_msg_buf(req->rq_reqmsg, 0);
 404
 405         if (body->data & OBD_BRW_WRITE)
 406                 return ost_brw_write(req);
 407         else
 408                 return ost_brw_read(req);
 409 }
 410
 411
 412 static int ost_handle(struct ptlrpc_request *req)
 413 {
 414         int rc;
 415         ENTRY;
 416
 417         rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
 418         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_HANDLE_UNPACK)) {
 419                 CERROR("lustre_ost: Invalid request\n");
 420                 GOTO(out, rc);
 421         }
 422
 423         if (req->rq_reqmsg->type != PTL_RPC_MSG_REQUEST) {
 424                 CERROR("lustre_ost: wrong packet type sent %d\n",
 425                        req->rq_reqmsg->type);
 426                 GOTO(out, rc = -EINVAL);
 427         }
 428
 429         if (req->rq_reqmsg->opc != OST_CONNECT &&
 430             req->rq_export == NULL)
 431                 GOTO(out, rc = -ENOTCONN);
 432
 433         if (strcmp(req->rq_obd->obd_type->typ_name, "ost") != 0)
 434                 GOTO(out, rc = -EINVAL);
 435
 436         switch (req->rq_reqmsg->opc) {
 437         case OST_CONNECT:
 438                 CDEBUG(D_INODE, "connect\n");
 439                 OBD_FAIL_RETURN(OBD_FAIL_OST_CONNECT_NET, 0);
 440                 rc = target_handle_connect(req);
 441                 break;
 442         case OST_DISCONNECT:
 443                 CDEBUG(D_INODE, "disconnect\n");
 444                 OBD_FAIL_RETURN(OBD_FAIL_OST_DISCONNECT_NET, 0);
 445                 rc = target_handle_disconnect(req);
 446                 break;
 447         case OST_CREATE:
 448                 CDEBUG(D_INODE, "create\n");
 449                 OBD_FAIL_RETURN(OBD_FAIL_OST_CREATE_NET, 0);
 450                 rc = ost_create(req);
 451                 break;
 452         case OST_DESTROY:
 453                 CDEBUG(D_INODE, "destroy\n");
 454                 OBD_FAIL_RETURN(OBD_FAIL_OST_DESTROY_NET, 0);
 455                 rc = ost_destroy(req);
 456                 break;
 457         case OST_GETATTR:
 458                 CDEBUG(D_INODE, "getattr\n");
 459                 OBD_FAIL_RETURN(OBD_FAIL_OST_GETATTR_NET, 0);
 460                 rc = ost_getattr(req);
 461                 break;
 462         case OST_SETATTR:
 463                 CDEBUG(D_INODE, "setattr\n");
 464                 OBD_FAIL_RETURN(OBD_FAIL_OST_SETATTR_NET, 0);
 465                 rc = ost_setattr(req);
 466                 break;
 467         case OST_OPEN:
 468                 CDEBUG(D_INODE, "setattr\n");
 469                 OBD_FAIL_RETURN(OBD_FAIL_OST_OPEN_NET, 0);
 470                 rc = ost_open(req);
 471                 break;
 472         case OST_CLOSE:
 473                 CDEBUG(D_INODE, "setattr\n");
 474                 OBD_FAIL_RETURN(OBD_FAIL_OST_CLOSE_NET, 0);
 475                 rc = ost_close(req);
 476                 break;
 477         case OST_BRW:
 478                 CDEBUG(D_INODE, "brw\n");
 479                 OBD_FAIL_RETURN(OBD_FAIL_OST_BRW_NET, 0);
 480                 rc = ost_brw(req);
 481                 /* ost_brw sends its own replies */
 482                 RETURN(rc);
 483         case OST_PUNCH:
 484                 CDEBUG(D_INODE, "punch\n");
 485                 OBD_FAIL_RETURN(OBD_FAIL_OST_PUNCH_NET, 0);
 486                 rc = ost_punch(req);
 487                 break;
 488         case OST_STATFS:
 489                 CDEBUG(D_INODE, "statfs\n");
 490                 OBD_FAIL_RETURN(OBD_FAIL_OST_STATFS_NET, 0);
 491                 rc = ost_statfs(req);
 492                 break;
 493         default:
 494                 req->rq_status = -ENOTSUPP;
 495                 rc = ptlrpc_error(req->rq_svc, req);
 496                 RETURN(rc);
 497         }
 498
 499         EXIT;
 500 out:
 501         //req->rq_status = rc;
 502         if (rc) {
 503                 CERROR("ost: processing error (opcode=%d): %d\n",
 504                        req->rq_reqmsg->opc, rc);
 505                 ptlrpc_error(req->rq_svc, req);
 506         } else {
 507                 CDEBUG(D_INODE, "sending reply\n");
 508                 if (req->rq_repmsg == NULL)
 509                         CERROR("handler for opcode %d returned rc=0 without "
 510                                "creating rq_repmsg; needs to return rc != "
 511                                "0!\n");
 512                 ptlrpc_reply(req->rq_svc, req);
 513         }
 514
 515         return 0;
 516 }
 517
 518 #define OST_NUM_THREADS 6
 519
 520 /* mount the file system (secretly) */
 521 static int ost_setup(struct obd_device *obddev, obd_count len, void *buf)
 522 {
 523         struct obd_ioctl_data* data = buf;
 524         struct ost_obd *ost = &obddev->u.ost;
 525         struct obd_device *tgt;
 526         int err;
 527         int i;
 528         ENTRY;
 529
 530         if (data->ioc_dev < 0 || data->ioc_dev > MAX_OBD_DEVICES)
 531                 RETURN(-ENODEV);
 532
 533         MOD_INC_USE_COUNT;
 534         tgt = &obd_dev[data->ioc_dev];
 535         if (!(tgt->obd_flags & OBD_ATTACHED) ||
 536             !(tgt->obd_flags & OBD_SET_UP)) {
 537                 CERROR("device not attached or not set up (%d)\n",
 538                        data->ioc_dev);
 539                 GOTO(error_dec, err = -EINVAL);
 540         }
 541
 542         err = obd_connect(&ost->ost_conn, tgt);
 543         if (err) {
 544                 CERROR("fail to connect to device %d\n", data->ioc_dev);
 545                 GOTO(error_dec, err = -EINVAL);
 546         }
 547
 548         ost->ost_service = ptlrpc_init_svc(64 * 1024, OST_REQUEST_PORTAL,
 549                                            OSC_REPLY_PORTAL, "self",ost_handle);
 550         if (!ost->ost_service) {
 551                 CERROR("failed to start service\n");
 552                 GOTO(error_disc, err = -EINVAL);
 553         }
 554
 555         for (i = 0; i < OST_NUM_THREADS; i++) {
 556                 err = ptlrpc_start_thread(obddev, ost->ost_service,
 557                                           "lustre_ost");
 558                 if (err) {
 559                         CERROR("error starting thread #%d: rc %d\n", i, err);
 560                         GOTO(error_disc, err = -EINVAL);
 561                 }
 562         }
 563
 564         RETURN(0);
 565
 566 error_disc:
 567         obd_disconnect(&ost->ost_conn);
 568 error_dec:
 569         MOD_DEC_USE_COUNT;
 570         RETURN(err);
 571 }
 572
 573 static int ost_cleanup(struct obd_device * obddev)
 574 {
 575         struct ost_obd *ost = &obddev->u.ost;
 576         int err;
 577
 578         ENTRY;
 579
 580         if ( !list_empty(&obddev->obd_exports) ) {
 581                 CERROR("still has clients!\n");
 582                 RETURN(-EBUSY);
 583         }
 584
 585         ptlrpc_stop_all_threads(ost->ost_service);
 586         ptlrpc_unregister_service(ost->ost_service);
 587
 588         err = obd_disconnect(&ost->ost_conn);
 589         if (err) {
 590                 CERROR("lustre ost: fail to disconnect device\n");
 591                 RETURN(-EINVAL);
 592         }
 593
 594         MOD_DEC_USE_COUNT;
 595         RETURN(0);
 596 }
 597
 598 /* use obd ops to offer management infrastructure */
 599 static struct obd_ops ost_obd_ops = {
 600         o_setup:       ost_setup,
 601         o_cleanup:     ost_cleanup,
 602 };
 603
 604 static int __init ost_init(void)
 605 {
 606         class_register_type(&ost_obd_ops, LUSTRE_OST_NAME);
 607         return 0;
 608 }
 609
 610 static void __exit ost_exit(void)
 611 {
 612         class_unregister_type(LUSTRE_OST_NAME);
 613 }
 614
 615 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 616 MODULE_DESCRIPTION("Lustre Object Storage Target (OST) v0.01");
 617 MODULE_LICENSE("GPL");
 618
 619 module_init(ost_init);
 620 module_exit(ost_exit);