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_ost.h>
  47 #include <linux/lustre_net.h>
  48
  49 static int ost_destroy(struct ost_obd *ost, struct ptlrpc_request *req)
  50 {
  51         struct obd_conn conn;
  52         struct ost_body *body;
  53         int rc, size = sizeof(*body);
  54         ENTRY;
  55
  56         body = lustre_msg_buf(req->rq_reqmsg, 0);
  57         conn.oc_id = body->connid;
  58         conn.oc_dev = ost->ost_tgt;
  59
  60         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
  61         if (rc)
  62                 RETURN(rc);
  63
  64         req->rq_status = obd_destroy(&conn, &body->oa);
  65         RETURN(0);
  66 }
  67
  68 static int ost_getattr(struct ost_obd *ost, struct ptlrpc_request *req)
  69 {
  70         struct obd_conn conn;
  71         struct ost_body *body, *repbody;
  72         int rc, size = sizeof(*body);
  73         ENTRY;
  74
  75         body = lustre_msg_buf(req->rq_reqmsg, 0);
  76         conn.oc_id = body->connid;
  77         conn.oc_dev = ost->ost_tgt;
  78
  79         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
  80         if (rc)
  81                 RETURN(rc);
  82
  83         repbody = lustre_msg_buf(req->rq_repmsg, 0);
  84         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
  85         req->rq_status = obd_getattr(&conn, &repbody->oa);
  86         RETURN(0);
  87 }
  88
  89 static int ost_open(struct ost_obd *ost, struct ptlrpc_request *req)
  90 {
  91         struct obd_conn conn;
  92         struct ost_body *body, *repbody;
  93         int rc, size = sizeof(*body);
  94         ENTRY;
  95
  96         body = lustre_msg_buf(req->rq_reqmsg, 0);
  97         conn.oc_id = body->connid;
  98         conn.oc_dev = ost->ost_tgt;
  99
 100         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 101         if (rc)
 102                 RETURN(rc);
 103
 104         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 105         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 106         req->rq_status = obd_open(&conn, &repbody->oa);
 107         RETURN(0);
 108 }
 109
 110 static int ost_close(struct ost_obd *ost, struct ptlrpc_request *req)
 111 {
 112         struct obd_conn conn;
 113         struct ost_body *body, *repbody;
 114         int rc, size = sizeof(*body);
 115         ENTRY;
 116
 117         body = lustre_msg_buf(req->rq_reqmsg, 0);
 118         conn.oc_id = body->connid;
 119         conn.oc_dev = ost->ost_tgt;
 120
 121         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 122         if (rc)
 123                 RETURN(rc);
 124
 125         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 126         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 127         req->rq_status = obd_close(&conn, &repbody->oa);
 128         RETURN(0);
 129 }
 130
 131 static int ost_create(struct ost_obd *ost, struct ptlrpc_request *req)
 132 {
 133         struct obd_conn conn;
 134         struct ost_body *body, *repbody;
 135         int rc, size = sizeof(*body);
 136         ENTRY;
 137
 138         body = lustre_msg_buf(req->rq_reqmsg, 0);
 139         conn.oc_id = body->connid;
 140         conn.oc_dev = ost->ost_tgt;
 141
 142         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 143         if (rc)
 144                 RETURN(rc);
 145
 146         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 147         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 148         req->rq_status = obd_create(&conn, &repbody->oa);
 149         RETURN(0);
 150 }
 151
 152 static int ost_punch(struct ost_obd *ost, struct ptlrpc_request *req)
 153 {
 154         struct obd_conn conn;
 155         struct ost_body *body, *repbody;
 156         int rc, size = sizeof(*body);
 157         ENTRY;
 158
 159         body = lustre_msg_buf(req->rq_reqmsg, 0);
 160         conn.oc_id = body->connid;
 161         conn.oc_dev = ost->ost_tgt;
 162
 163         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 164         if (rc)
 165                 RETURN(rc);
 166
 167         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 168         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 169         req->rq_status = obd_punch(&conn, &repbody->oa,
 170                                    repbody->oa.o_size, repbody->oa.o_blocks);
 171         RETURN(0);
 172 }
 173
 174 static int ost_setattr(struct ost_obd *ost, struct ptlrpc_request *req)
 175 {
 176         struct obd_conn conn;
 177         struct ost_body *body, *repbody;
 178         int rc, size = sizeof(*body);
 179         ENTRY;
 180
 181         body = lustre_msg_buf(req->rq_reqmsg, 0);
 182         conn.oc_id = body->connid;
 183         conn.oc_dev = ost->ost_tgt;
 184
 185         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 186         if (rc)
 187                 RETURN(rc);
 188
 189         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 190         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 191         req->rq_status = obd_setattr(&conn, &repbody->oa);
 192         RETURN(0);
 193 }
 194
 195 static int ost_connect(struct ost_obd *ost, struct ptlrpc_request *req)
 196 {
 197         struct obd_conn conn;
 198         struct ost_body *body;
 199         int rc, size = sizeof(*body);
 200         ENTRY;
 201
 202         conn.oc_dev = ost->ost_tgt;
 203
 204         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 205         if (rc)
 206                 RETURN(rc);
 207
 208         req->rq_status = obd_connect(&conn);
 209
 210         CDEBUG(D_IOCTL, "rep buffer %p, id %d\n", req->rq_repmsg, conn.oc_id);
 211         body = lustre_msg_buf(req->rq_repmsg, 0);
 212         body->connid = conn.oc_id;
 213         RETURN(0);
 214 }
 215
 216 static int ost_disconnect(struct ost_obd *ost, struct ptlrpc_request *req)
 217 {
 218         struct obd_conn conn;
 219         struct ost_body *body;
 220         int rc, size = sizeof(*body);
 221         ENTRY;
 222
 223         body = lustre_msg_buf(req->rq_reqmsg, 0);
 224         conn.oc_id = body->connid;
 225         conn.oc_dev = ost->ost_tgt;
 226
 227         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 228         if (rc)
 229                 RETURN(rc);
 230
 231         CDEBUG(D_IOCTL, "Disconnecting %d\n", conn.oc_id);
 232         req->rq_status = obd_disconnect(&conn);
 233         RETURN(0);
 234 }
 235
 236 static int ost_get_info(struct ost_obd *ost, struct ptlrpc_request *req)
 237 {
 238         struct obd_conn conn;
 239         struct ost_body *body;
 240         int rc, size[2] = {sizeof(*body)};
 241         char *bufs[2] = {NULL, NULL}, *ptr;
 242         ENTRY;
 243
 244         body = lustre_msg_buf(req->rq_reqmsg, 0);
 245         conn.oc_id = body->connid;
 246         conn.oc_dev = ost->ost_tgt;
 247
 248         ptr = lustre_msg_buf(req->rq_reqmsg, 1);
 249         if (!ptr)
 250                 RETURN(-EINVAL);
 251
 252         req->rq_status = obd_get_info(&conn, req->rq_reqmsg->buflens[1], ptr,
 253                                       &(size[1]), (void **)&(bufs[1]));
 254
 255         rc = lustre_pack_msg(2, size, bufs, &req->rq_replen, &req->rq_repmsg);
 256         if (rc)
 257                 CERROR("cannot pack reply\n");
 258
 259         RETURN(rc);
 260 }
 261
 262 static int ost_brw_read(struct ost_obd *obddev, struct ptlrpc_request *req)
 263 {
 264         struct ptlrpc_bulk_desc **bulk_vec = NULL, *bulk = NULL;
 265         struct obd_conn conn;
 266         void *tmp1, *tmp2, *end2;
 267         struct niobuf *nb, *dst, *res = NULL;
 268         struct obd_ioobj *ioo;
 269         struct ost_body *body;
 270         int rc, cmd, i, j, objcount, niocount, size = sizeof(*body);
 271         ENTRY;
 272
 273         body = lustre_msg_buf(req->rq_reqmsg, 0);
 274         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 275         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 276         end2 = (char *)tmp2 + req->rq_reqmsg->buflens[2];
 277         objcount = req->rq_reqmsg->buflens[1] / sizeof(*ioo);
 278         niocount = req->rq_reqmsg->buflens[2] / sizeof(*nb);
 279         cmd = body->data;
 280
 281         conn.oc_id = body->connid;
 282         conn.oc_dev = req->rq_obd->u.ost.ost_tgt;
 283
 284         for (i = 0; i < objcount; i++) {
 285                 ost_unpack_ioo(&tmp1, &ioo);
 286                 if (tmp2 + ioo->ioo_bufcnt > end2) {
 287                         LBUG();
 288                         rc = -EFAULT;
 289                         break;
 290                 }
 291                 for (j = 0; j < ioo->ioo_bufcnt; j++)
 292                         ost_unpack_niobuf(&tmp2, &nb);
 293         }
 294
 295         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 296         if (rc)
 297                 RETURN(rc);
 298         OBD_ALLOC(res, sizeof(*res) * niocount);
 299         if (res == NULL)
 300                 RETURN(-ENOMEM);
 301
 302         /* The unpackers move tmp1 and tmp2, so reset them before using */
 303         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 304         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 305         req->rq_status = obd_preprw(cmd, &conn, objcount,
 306                                     tmp1, niocount, tmp2, res);
 307
 308         if (req->rq_status)
 309                 GOTO(out, 0);
 310
 311         for (i = 0; i < niocount; i++) {
 312                 bulk = ptlrpc_prep_bulk(req->rq_connection);
 313                 if (bulk == NULL) {
 314                         CERROR("cannot alloc bulk desc\n");
 315                         GOTO(out, rc = -ENOMEM);
 316                 }
 317
 318                 dst = &(((struct niobuf *)tmp2)[i]);
 319                 bulk->b_xid = dst->xid;
 320                 bulk->b_buf = (void *)(unsigned long)res[i].addr;
 321                 bulk->b_buflen = PAGE_SIZE;
 322                 rc = ptlrpc_send_bulk(bulk, OST_BULK_PORTAL);
 323                 if (rc)
 324                         GOTO(out, rc);
 325                 wait_event_interruptible(bulk->b_waitq,
 326                                          ptlrpc_check_bulk_sent(bulk));
 327
 328                 if (bulk->b_flags & PTL_RPC_FL_INTR)
 329                         GOTO(out, 0);
 330
 331                 ptlrpc_free_bulk(bulk);
 332         }
 333         bulk = NULL;
 334
 335         /* The unpackers move tmp1 and tmp2, so reset them before using */
 336         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 337         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 338         req->rq_status = obd_commitrw(cmd, &conn, objcount,
 339                                       tmp1, niocount, res);
 340
 341         EXIT;
 342  out:
 343         if (res != NULL)
 344                 OBD_FREE(res, sizeof(*res) * niocount);
 345         if (bulk != NULL)
 346                 ptlrpc_free_bulk(bulk);
 347         if (bulk_vec != NULL) {
 348                 for (i = 0; i < niocount; i++)
 349                         if (bulk_vec[i] != NULL)
 350                                 ptlrpc_free_bulk(bulk_vec[i]);
 351                 OBD_FREE(bulk_vec, niocount * sizeof(*bulk_vec));
 352         }
 353
 354         return 0;
 355 }
 356
 357 static int ost_commit_page(struct obd_conn *conn, struct page *page)
 358 {
 359         struct obd_ioobj obj;
 360         struct niobuf buf;
 361         int rc;
 362         ENTRY;
 363
 364         memset(&buf, 0, sizeof(buf));
 365         memset(&obj, 0, sizeof(obj));
 366
 367         buf.page = page;
 368         obj.ioo_bufcnt = 1;
 369
 370         rc = obd_commitrw(OBD_BRW_WRITE, conn, 1, &obj, 1, &buf);
 371         RETURN(rc);
 372 }
 373
 374 static int ost_brw_write_cb(struct ptlrpc_bulk_desc *bulk, void *data)
 375 {
 376         int rc;
 377
 378         ENTRY;
 379
 380         rc = ost_commit_page(&bulk->b_conn, bulk->b_page);
 381         if (rc)
 382                 CERROR("ost_commit_page failed: %d\n", rc);
 383
 384         RETURN(rc);
 385 }
 386
 387 static int ost_brw_write(struct ost_obd *obddev, struct ptlrpc_request *req)
 388 {
 389         struct obd_conn conn;
 390         struct niobuf *nb, *res;
 391         struct obd_ioobj *ioo;
 392         struct ost_body *body;
 393         int cmd, rc, i, j, objcount, niocount, size[2] = {sizeof(*body)};
 394         void *tmp1, *tmp2, *end2;
 395         ENTRY;
 396
 397         body = lustre_msg_buf(req->rq_reqmsg, 0);
 398         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 399         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 400         end2 = (char *)tmp2 + req->rq_reqmsg->buflens[2];
 401         objcount = req->rq_reqmsg->buflens[1] / sizeof(*ioo);
 402         niocount = req->rq_reqmsg->buflens[2] / sizeof(*nb);
 403         cmd = body->data;
 404
 405         conn.oc_id = body->connid;
 406         conn.oc_dev = req->rq_obd->u.ost.ost_tgt;
 407
 408         for (i = 0; i < objcount; i++) {
 409                 ost_unpack_ioo((void *)&tmp1, &ioo);
 410                 if (tmp2 + ioo->ioo_bufcnt > end2) {
 411                         rc = -EFAULT;
 412                         break;
 413                 }
 414                 for (j = 0; j < ioo->ioo_bufcnt; j++)
 415                         ost_unpack_niobuf((void *)&tmp2, &nb);
 416         }
 417
 418         size[1] = niocount * sizeof(*nb);
 419         rc = lustre_pack_msg(2, size, NULL, &req->rq_replen, &req->rq_repmsg);
 420         if (rc)
 421                 RETURN(rc);
 422
 423         res = lustre_msg_buf(req->rq_repmsg, 1);
 424
 425         /* The unpackers move tmp1 and tmp2, so reset them before using */
 426         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 427         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 428         req->rq_status = obd_preprw(cmd, &conn, objcount,
 429                                     tmp1, niocount, tmp2, res);
 430
 431         if (req->rq_status)
 432                 GOTO(out, 0);
 433
 434         for (i = 0; i < niocount; i++, res++) {
 435                 struct ptlrpc_bulk_desc *bulk;
 436                 struct ptlrpc_service *srv = req->rq_obd->u.ost.ost_service;
 437
 438                 bulk = ptlrpc_prep_bulk(req->rq_connection);
 439                 if (bulk == NULL)
 440                         GOTO(out, rc = -ENOMEM);
 441
 442                 spin_lock(&srv->srv_lock);
 443                 bulk->b_xid = srv->srv_xid++;
 444                 spin_unlock(&srv->srv_lock);
 445
 446                 res->xid = HTON__u32(bulk->b_xid);
 447
 448                 bulk->b_buf = (void *)(unsigned long)res->addr;
 449                 bulk->b_cb = ost_brw_write_cb;
 450                 bulk->b_page = res->page;
 451                 memcpy(&(bulk->b_conn), &conn, sizeof(conn));
 452                 bulk->b_buflen = PAGE_SIZE;
 453                 bulk->b_portal = OSC_BULK_PORTAL;
 454                 rc = ptlrpc_register_bulk(bulk);
 455                 if (rc)
 456                         GOTO(out, rc);
 457         }
 458
 459         EXIT;
 460  out:
 461         /* FIXME: should we return 'rc' here? */
 462         return 0;
 463 }
 464
 465 static int ost_brw(struct ost_obd *obddev, struct ptlrpc_request *req)
 466 {
 467         struct ost_body *body = lustre_msg_buf(req->rq_reqmsg, 0);
 468
 469         if (body->data == OBD_BRW_READ)
 470                 return ost_brw_read(obddev, req);
 471         else
 472                 return ost_brw_write(obddev, req);
 473 }
 474
 475 static int ost_handle(struct obd_device *obddev, struct ptlrpc_service *svc,
 476                       struct ptlrpc_request *req)
 477 {
 478         int rc;
 479         struct ost_obd *ost = &obddev->u.ost;
 480         ENTRY;
 481
 482         rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
 483         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_HANDLE_UNPACK)) {
 484                 CERROR("lustre_mds: Invalid request\n");
 485                 GOTO(out, rc);
 486         }
 487
 488         if (req->rq_reqmsg->type != PTL_RPC_MSG_REQUEST) {
 489                 CERROR("lustre_mds: wrong packet type sent %d\n",
 490                        req->rq_reqmsg->type);
 491                 GOTO(out, rc = -EINVAL);
 492         }
 493
 494         switch (req->rq_reqmsg->opc) {
 495         case OST_CONNECT:
 496                 CDEBUG(D_INODE, "connect\n");
 497                 OBD_FAIL_RETURN(OBD_FAIL_OST_CONNECT_NET, 0);
 498                 rc = ost_connect(ost, req);
 499                 break;
 500         case OST_DISCONNECT:
 501                 CDEBUG(D_INODE, "disconnect\n");
 502                 OBD_FAIL_RETURN(OBD_FAIL_OST_DISCONNECT_NET, 0);
 503                 rc = ost_disconnect(ost, req);
 504                 break;
 505         case OST_GET_INFO:
 506                 CDEBUG(D_INODE, "get_info\n");
 507                 OBD_FAIL_RETURN(OBD_FAIL_OST_GET_INFO_NET, 0);
 508                 rc = ost_get_info(ost, req);
 509                 break;
 510         case OST_CREATE:
 511                 CDEBUG(D_INODE, "create\n");
 512                 OBD_FAIL_RETURN(OBD_FAIL_OST_CREATE_NET, 0);
 513                 rc = ost_create(ost, req);
 514                 break;
 515         case OST_DESTROY:
 516                 CDEBUG(D_INODE, "destroy\n");
 517                 OBD_FAIL_RETURN(OBD_FAIL_OST_DESTROY_NET, 0);
 518                 rc = ost_destroy(ost, req);
 519                 break;
 520         case OST_GETATTR:
 521                 CDEBUG(D_INODE, "getattr\n");
 522                 OBD_FAIL_RETURN(OBD_FAIL_OST_GETATTR_NET, 0);
 523                 rc = ost_getattr(ost, req);
 524                 break;
 525         case OST_SETATTR:
 526                 CDEBUG(D_INODE, "setattr\n");
 527                 OBD_FAIL_RETURN(OBD_FAIL_OST_SETATTR_NET, 0);
 528                 rc = ost_setattr(ost, req);
 529                 break;
 530         case OST_OPEN:
 531                 CDEBUG(D_INODE, "setattr\n");
 532                 OBD_FAIL_RETURN(OBD_FAIL_OST_OPEN_NET, 0);
 533                 rc = ost_open(ost, req);
 534                 break;
 535         case OST_CLOSE:
 536                 CDEBUG(D_INODE, "setattr\n");
 537                 OBD_FAIL_RETURN(OBD_FAIL_OST_CLOSE_NET, 0);
 538                 rc = ost_close(ost, req);
 539                 break;
 540         case OST_BRW:
 541                 CDEBUG(D_INODE, "brw\n");
 542                 OBD_FAIL_RETURN(OBD_FAIL_OST_BRW_NET, 0);
 543                 rc = ost_brw(ost, req);
 544                 break;
 545         case OST_PUNCH:
 546                 CDEBUG(D_INODE, "punch\n");
 547                 OBD_FAIL_RETURN(OBD_FAIL_OST_PUNCH_NET, 0);
 548                 rc = ost_punch(ost, req);
 549                 break;
 550         default:
 551                 req->rq_status = -ENOTSUPP;
 552                 rc = ptlrpc_error(svc, req);
 553                 RETURN(rc);
 554         }
 555
 556         EXIT;
 557 out:
 558         //req->rq_status = rc;
 559         if (rc) {
 560                 CERROR("ost: processing error %d\n", rc);
 561                 ptlrpc_error(svc, req);
 562         } else {
 563                 CDEBUG(D_INODE, "sending reply\n");
 564                 ptlrpc_reply(svc, req);
 565         }
 566
 567         return 0;
 568 }
 569
 570 /* mount the file system (secretly) */
 571 static int ost_setup(struct obd_device *obddev, obd_count len, void *buf)
 572 {
 573         struct obd_ioctl_data* data = buf;
 574         struct ost_obd *ost = &obddev->u.ost;
 575         struct obd_device *tgt;
 576         int err;
 577         ENTRY;
 578
 579         if (data->ioc_dev < 0 || data->ioc_dev > MAX_OBD_DEVICES)
 580                 RETURN(-ENODEV);
 581
 582         MOD_INC_USE_COUNT;
 583         tgt = &obd_dev[data->ioc_dev];
 584         ost->ost_tgt = tgt;
 585         if (!(tgt->obd_flags & OBD_ATTACHED) ||
 586             !(tgt->obd_flags & OBD_SET_UP)) {
 587                 CERROR("device not attached or not set up (%d)\n",
 588                        data->ioc_dev);
 589                 GOTO(error_dec, err = -EINVAL);
 590         }
 591
 592         ost->ost_conn.oc_dev = tgt;
 593         err = obd_connect(&ost->ost_conn);
 594         if (err) {
 595                 CERROR("fail to connect to device %d\n", data->ioc_dev);
 596                 GOTO(error_dec, err = -EINVAL);
 597         }
 598
 599         ost->ost_service = ptlrpc_init_svc(128 * 1024,
 600                                            OST_REQUEST_PORTAL, OSC_REPLY_PORTAL,
 601                                            "self", ost_handle);
 602         if (!ost->ost_service) {
 603                 CERROR("failed to start service\n");
 604                 GOTO(error_disc, err = -EINVAL);
 605         }
 606
 607         err = ptlrpc_start_thread(obddev, ost->ost_service, "lustre_ost");
 608         if (err)
 609                 GOTO(error_disc, err = -EINVAL);
 610
 611         RETURN(0);
 612
 613 error_disc:
 614         obd_disconnect(&ost->ost_conn);
 615 error_dec:
 616         MOD_DEC_USE_COUNT;
 617         RETURN(err);
 618 }
 619
 620 static int ost_cleanup(struct obd_device * obddev)
 621 {
 622         struct ost_obd *ost = &obddev->u.ost;
 623         int err;
 624
 625         ENTRY;
 626
 627         if ( !list_empty(&obddev->obd_gen_clients) ) {
 628                 CERROR("still has clients!\n");
 629                 RETURN(-EBUSY);
 630         }
 631
 632         ptlrpc_stop_thread(ost->ost_service);
 633         rpc_unregister_service(ost->ost_service);
 634
 635         if (!list_empty(&ost->ost_service->srv_reqs)) {
 636                 // XXX reply with errors and clean up
 637                 CERROR("Request list not empty!\n");
 638         }
 639         OBD_FREE(ost->ost_service, sizeof(*ost->ost_service));
 640
 641         err = obd_disconnect(&ost->ost_conn);
 642         if (err) {
 643                 CERROR("lustre ost: fail to disconnect device\n");
 644                 RETURN(-EINVAL);
 645         }
 646
 647         MOD_DEC_USE_COUNT;
 648         RETURN(0);
 649 }
 650
 651 /* use obd ops to offer management infrastructure */
 652 static struct obd_ops ost_obd_ops = {
 653         o_setup:       ost_setup,
 654         o_cleanup:     ost_cleanup,
 655 };
 656
 657 static int __init ost_init(void)
 658 {
 659         obd_register_type(&ost_obd_ops, LUSTRE_OST_NAME);
 660         return 0;
 661 }
 662
 663 static void __exit ost_exit(void)
 664 {
 665         obd_unregister_type(LUSTRE_OST_NAME);
 666 }
 667
 668 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
 669 MODULE_DESCRIPTION("Lustre Object Storage Target (OST) v0.01");
 670 MODULE_LICENSE("GPL");
 671
 672 module_init(ost_init);
 673 module_exit(ost_exit);