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
  40 static int ost_destroy(struct ost_obd *ost, struct ptlrpc_request *req)
  41 {
  42         struct obd_conn conn;
  43         struct ost_body *body;
  44         int rc, size = sizeof(*body);
  45         ENTRY;
  46
  47         body = lustre_msg_buf(req->rq_reqmsg, 0);
  48         conn.oc_id = body->connid;
  49         conn.oc_dev = ost->ost_tgt;
  50
  51         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
  52         if (rc)
  53                 RETURN(rc);
  54
  55         req->rq_status = obd_destroy(&conn, &body->oa);
  56         RETURN(0);
  57 }
  58
  59 static int ost_getattr(struct ost_obd *ost, struct ptlrpc_request *req)
  60 {
  61         struct obd_conn conn;
  62         struct ost_body *body, *repbody;
  63         int rc, size = sizeof(*body);
  64         ENTRY;
  65
  66         body = lustre_msg_buf(req->rq_reqmsg, 0);
  67         conn.oc_id = body->connid;
  68         conn.oc_dev = ost->ost_tgt;
  69
  70         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
  71         if (rc)
  72                 RETURN(rc);
  73
  74         repbody = lustre_msg_buf(req->rq_repmsg, 0);
  75         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
  76         req->rq_status = obd_getattr(&conn, &repbody->oa);
  77         RETURN(0);
  78 }
  79
  80 static int ost_open(struct ost_obd *ost, struct ptlrpc_request *req)
  81 {
  82         struct obd_conn conn;
  83         struct ost_body *body, *repbody;
  84         int rc, size = sizeof(*body);
  85         ENTRY;
  86
  87         body = lustre_msg_buf(req->rq_reqmsg, 0);
  88         conn.oc_id = body->connid;
  89         conn.oc_dev = ost->ost_tgt;
  90
  91         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
  92         if (rc)
  93                 RETURN(rc);
  94
  95         repbody = lustre_msg_buf(req->rq_repmsg, 0);
  96         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
  97         req->rq_status = obd_open(&conn, &repbody->oa);
  98         RETURN(0);
  99 }
 100
 101 static int ost_close(struct ost_obd *ost, struct ptlrpc_request *req)
 102 {
 103         struct obd_conn conn;
 104         struct ost_body *body, *repbody;
 105         int rc, size = sizeof(*body);
 106         ENTRY;
 107
 108         body = lustre_msg_buf(req->rq_reqmsg, 0);
 109         conn.oc_id = body->connid;
 110         conn.oc_dev = ost->ost_tgt;
 111
 112         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 113         if (rc)
 114                 RETURN(rc);
 115
 116         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 117         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 118         req->rq_status = obd_close(&conn, &repbody->oa);
 119         RETURN(0);
 120 }
 121
 122 static int ost_create(struct ost_obd *ost, struct ptlrpc_request *req)
 123 {
 124         struct obd_conn conn;
 125         struct ost_body *body, *repbody;
 126         int rc, size = sizeof(*body);
 127         ENTRY;
 128
 129         body = lustre_msg_buf(req->rq_reqmsg, 0);
 130         conn.oc_id = body->connid;
 131         conn.oc_dev = ost->ost_tgt;
 132
 133         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 134         if (rc)
 135                 RETURN(rc);
 136
 137         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 138         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 139         req->rq_status = obd_create(&conn, &repbody->oa);
 140         RETURN(0);
 141 }
 142
 143 static int ost_punch(struct ost_obd *ost, struct ptlrpc_request *req)
 144 {
 145         struct obd_conn conn;
 146         struct ost_body *body, *repbody;
 147         int rc, size = sizeof(*body);
 148         ENTRY;
 149
 150         body = lustre_msg_buf(req->rq_reqmsg, 0);
 151         conn.oc_id = body->connid;
 152         conn.oc_dev = ost->ost_tgt;
 153
 154         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 155         if (rc)
 156                 RETURN(rc);
 157
 158         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 159         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 160         req->rq_status = obd_punch(&conn, &repbody->oa,
 161                                    repbody->oa.o_size, repbody->oa.o_blocks);
 162         RETURN(0);
 163 }
 164
 165 static int ost_setattr(struct ost_obd *ost, struct ptlrpc_request *req)
 166 {
 167         struct obd_conn conn;
 168         struct ost_body *body, *repbody;
 169         int rc, size = sizeof(*body);
 170         ENTRY;
 171
 172         body = lustre_msg_buf(req->rq_reqmsg, 0);
 173         conn.oc_id = body->connid;
 174         conn.oc_dev = ost->ost_tgt;
 175
 176         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 177         if (rc)
 178                 RETURN(rc);
 179
 180         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 181         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 182         req->rq_status = obd_setattr(&conn, &repbody->oa);
 183         RETURN(0);
 184 }
 185
 186 static int ost_connect(struct ost_obd *ost, struct ptlrpc_request *req)
 187 {
 188         struct obd_conn conn;
 189         struct ost_body *body;
 190         int rc, size = sizeof(*body);
 191         ENTRY;
 192
 193         conn.oc_dev = ost->ost_tgt;
 194
 195         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 196         if (rc)
 197                 RETURN(rc);
 198
 199         req->rq_status = obd_connect(&conn);
 200
 201         CDEBUG(D_IOCTL, "rep buffer %p, id %d\n", req->rq_repmsg, conn.oc_id);
 202         body = lustre_msg_buf(req->rq_repmsg, 0);
 203         body->connid = conn.oc_id;
 204         RETURN(0);
 205 }
 206
 207 static int ost_disconnect(struct ost_obd *ost, struct ptlrpc_request *req)
 208 {
 209         struct obd_conn conn;
 210         struct ost_body *body;
 211         int rc, size = sizeof(*body);
 212         ENTRY;
 213
 214         body = lustre_msg_buf(req->rq_reqmsg, 0);
 215         conn.oc_id = body->connid;
 216         conn.oc_dev = ost->ost_tgt;
 217
 218         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 219         if (rc)
 220                 RETURN(rc);
 221
 222         CDEBUG(D_IOCTL, "Disconnecting %d\n", conn.oc_id);
 223         req->rq_status = obd_disconnect(&conn);
 224         RETURN(0);
 225 }
 226
 227 static int ost_get_info(struct ost_obd *ost, struct ptlrpc_request *req)
 228 {
 229         struct obd_conn conn;
 230         struct ost_body *body;
 231         int rc, size[2] = {sizeof(*body)};
 232         char *bufs[2] = {NULL, NULL}, *ptr;
 233         ENTRY;
 234
 235         body = lustre_msg_buf(req->rq_reqmsg, 0);
 236         conn.oc_id = body->connid;
 237         conn.oc_dev = ost->ost_tgt;
 238
 239         ptr = lustre_msg_buf(req->rq_reqmsg, 1);
 240         if (!ptr)
 241                 RETURN(-EINVAL);
 242
 243         req->rq_status = obd_get_info(&conn, req->rq_reqmsg->buflens[1], ptr,
 244                                       &(size[1]), (void **)&(bufs[1]));
 245
 246         rc = lustre_pack_msg(2, size, bufs, &req->rq_replen, &req->rq_repmsg);
 247         if (rc)
 248                 CERROR("cannot pack reply\n");
 249
 250         RETURN(rc);
 251 }
 252
 253 static int ost_brw_read(struct ost_obd *obddev, struct ptlrpc_request *req)
 254 {
 255         struct ptlrpc_bulk_desc *desc;
 256         struct obd_conn conn;
 257         void *tmp1, *tmp2, *end2;
 258         struct niobuf_remote *remote_nb;
 259         struct niobuf_local *local_nb = NULL;
 260         struct obd_ioobj *ioo;
 261         struct ost_body *body;
 262         int rc, cmd, i, j, objcount, niocount, size = sizeof(*body);
 263         ENTRY;
 264
 265         body = lustre_msg_buf(req->rq_reqmsg, 0);
 266         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 267         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 268         end2 = (char *)tmp2 + req->rq_reqmsg->buflens[2];
 269         objcount = req->rq_reqmsg->buflens[1] / sizeof(*ioo);
 270         niocount = req->rq_reqmsg->buflens[2] / sizeof(*remote_nb);
 271         cmd = body->data;
 272
 273         conn.oc_id = body->connid;
 274         conn.oc_dev = req->rq_obd->u.ost.ost_tgt;
 275
 276         for (i = 0; i < objcount; i++) {
 277                 ost_unpack_ioo(&tmp1, &ioo);
 278                 if (tmp2 + ioo->ioo_bufcnt > end2) {
 279                         LBUG();
 280                         GOTO(out, rc = -EFAULT);
 281                 }
 282                 for (j = 0; j < ioo->ioo_bufcnt; j++)
 283                         ost_unpack_niobuf(&tmp2, &remote_nb);
 284         }
 285
 286         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 287         if (rc)
 288                 RETURN(rc);
 289         OBD_ALLOC(local_nb, sizeof(*local_nb) * niocount);
 290         if (local_nb == NULL)
 291                 RETURN(-ENOMEM);
 292
 293         /* The unpackers move tmp1 and tmp2, so reset them before using */
 294         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 295         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 296         req->rq_status = obd_preprw(cmd, &conn, objcount,
 297                                     tmp1, niocount, tmp2, local_nb);
 298
 299         if (req->rq_status)
 300                 GOTO(out_local, 0);
 301
 302         desc = ptlrpc_prep_bulk(req->rq_connection);
 303         if (desc == NULL)
 304                 GOTO(out_local, rc = -ENOMEM);
 305         desc->b_portal = OST_BULK_PORTAL;
 306
 307         for (i = 0; i < niocount; i++) {
 308                 struct ptlrpc_bulk_page *bulk;
 309                 bulk = ptlrpc_prep_bulk_page(desc);
 310                 if (bulk == NULL)
 311                         GOTO(out_bulk, rc = -ENOMEM);
 312                 remote_nb = &(((struct niobuf_remote *)tmp2)[i]);
 313                 bulk->b_xid = remote_nb->xid;
 314                 bulk->b_buf = (void *)(unsigned long)local_nb[i].addr;
 315                 bulk->b_buflen = PAGE_SIZE;
 316         }
 317
 318         rc = ptlrpc_send_bulk(desc);
 319         if (rc)
 320                 GOTO(out_bulk, rc);
 321
 322         /* The unpackers move tmp1 and tmp2, so reset them before using */
 323         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 324         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 325         req->rq_status = obd_commitrw(cmd, &conn, objcount,
 326                                       tmp1, niocount, local_nb);
 327
 328 out_bulk:
 329         ptlrpc_free_bulk(desc);
 330 out_local:
 331         OBD_FREE(local_nb, sizeof(*local_nb) * niocount);
 332 out:
 333         RETURN(rc);
 334 }
 335
 336 static int ost_commit_page(struct obd_conn *conn, struct page *page)
 337 {
 338         struct obd_ioobj obj;
 339         struct niobuf_local buf;
 340         int rc;
 341         ENTRY;
 342
 343         memset(&buf, 0, sizeof(buf));
 344         memset(&obj, 0, sizeof(obj));
 345
 346         buf.page = page;
 347         obj.ioo_bufcnt = 1;
 348
 349         rc = obd_commitrw(OBD_BRW_WRITE, conn, 1, &obj, 1, &buf);
 350         RETURN(rc);
 351 }
 352
 353 static int ost_brw_write_cb(struct ptlrpc_bulk_page *bulk)
 354 {
 355         void *journal_save;
 356         int rc;
 357         ENTRY;
 358
 359         /* Restore the filesystem journal context when we do the commit.
 360          * This is needed for ext3 and reiserfs, but can't really hurt
 361          * other filesystems.
 362          */
 363         journal_save = current->journal_info;
 364         current->journal_info = bulk->b_desc->b_journal_info;
 365         CDEBUG(D_BUFFS, "journal_info: saved %p->%p, restored %p\n", current,
 366                journal_save, bulk->b_desc->b_journal_info);
 367         rc = ost_commit_page(&bulk->b_desc->b_conn, bulk->b_page);
 368         current->journal_info = journal_save;
 369         CDEBUG(D_BUFFS, "journal_info: restored %p->%p\n", current,
 370                journal_save);
 371         if (rc)
 372                 CERROR("ost_commit_page failed: %d\n", rc);
 373
 374         RETURN(rc);
 375 }
 376
 377 static int ost_brw_write_finished_cb(struct ptlrpc_bulk_desc *desc)
 378 {
 379         ptlrpc_free_bulk(desc);
 380
 381         return 0;
 382 }
 383
 384 static int ost_brw_write(struct ost_obd *obddev, struct ptlrpc_request *req)
 385 {
 386         struct ptlrpc_bulk_desc *desc;
 387         struct obd_conn conn;
 388         struct niobuf_remote *remote_nb;
 389         struct niobuf_local *local_nb, *lnb;
 390         struct obd_ioobj *ioo;
 391         struct ost_body *body;
 392         int cmd, rc, i, j, objcount, niocount, size[2] = {sizeof(*body)};
 393         void *tmp1, *tmp2, *end2;
 394         ENTRY;
 395
 396         body = lustre_msg_buf(req->rq_reqmsg, 0);
 397         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 398         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 399         end2 = (char *)tmp2 + req->rq_reqmsg->buflens[2];
 400         objcount = req->rq_reqmsg->buflens[1] / sizeof(*ioo);
 401         niocount = req->rq_reqmsg->buflens[2] / sizeof(*remote_nb);
 402         cmd = body->data;
 403
 404         conn.oc_id = body->connid;
 405         conn.oc_dev = req->rq_obd->u.ost.ost_tgt;
 406
 407         for (i = 0; i < objcount; i++) {
 408                 ost_unpack_ioo((void *)&tmp1, &ioo);
 409                 if (tmp2 + ioo->ioo_bufcnt > end2) {
 410                         rc = -EFAULT;
 411                         break;
 412                 }
 413                 for (j = 0; j < ioo->ioo_bufcnt; j++)
 414                         ost_unpack_niobuf((void *)&tmp2, &remote_nb);
 415         }
 416
 417         size[1] = niocount * sizeof(*remote_nb);
 418         rc = lustre_pack_msg(2, size, NULL, &req->rq_replen, &req->rq_repmsg);
 419         if (rc)
 420                 GOTO(out, rc);
 421         remote_nb = lustre_msg_buf(req->rq_repmsg, 1);
 422
 423         OBD_ALLOC(local_nb, niocount * sizeof(*local_nb));
 424         if (local_nb == NULL)
 425                 GOTO(out, rc = -ENOMEM);
 426
 427         /* The unpackers move tmp1 and tmp2, so reset them before using */
 428         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 429         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 430         req->rq_status = obd_preprw(cmd, &conn, objcount,
 431                                     tmp1, niocount, tmp2, local_nb);
 432         if (req->rq_status)
 433                 GOTO(out_free, rc = 0); /* XXX is this correct? */
 434
 435         desc = ptlrpc_prep_bulk(req->rq_connection);
 436         if (desc == NULL)
 437                 GOTO(fail_preprw, rc = -ENOMEM);
 438         desc->b_cb = ost_brw_write_finished_cb;
 439         desc->b_portal = OSC_BULK_PORTAL;
 440         memcpy(&(desc->b_conn), &conn, sizeof(conn));
 441
 442         /* Save journal context for commit callbacks */
 443         CDEBUG(D_BUFFS, "journal_info: saved %p->%p\n", current,
 444                current->journal_info);
 445         desc->b_journal_info = current->journal_info;
 446
 447         for (i = 0, lnb = local_nb; i < niocount; i++, lnb++) {
 448                 struct ptlrpc_service *srv = req->rq_obd->u.ost.ost_service;
 449                 struct ptlrpc_bulk_page *bulk;
 450
 451                 bulk = ptlrpc_prep_bulk_page(desc);
 452                 if (bulk == NULL)
 453                         GOTO(fail_bulk, rc = -ENOMEM);
 454
 455                 spin_lock(&srv->srv_lock);
 456                 bulk->b_xid = srv->srv_xid++;
 457                 spin_unlock(&srv->srv_lock);
 458
 459                 bulk->b_buf = (void *)(unsigned long)lnb->addr;
 460                 bulk->b_page = lnb->page;
 461                 bulk->b_buflen = PAGE_SIZE;
 462                 bulk->b_cb = ost_brw_write_cb;
 463
 464                 /* this advances remote_nb */
 465                 ost_pack_niobuf((void **)&remote_nb, lnb->offset, lnb->len, 0,
 466                                 bulk->b_xid);
 467         }
 468
 469         rc = ptlrpc_register_bulk(desc);
 470         current->journal_info = NULL; /* kind of scary */
 471         if (rc)
 472                 GOTO(fail_bulk, rc);
 473
 474         EXIT;
 475 out_free:
 476         OBD_FREE(local_nb, niocount * sizeof(*local_nb));
 477 out:
 478         return rc;
 479
 480 fail_bulk:
 481         ptlrpc_free_bulk(desc);
 482         /* FIXME: how do we undo the preprw? */
 483 fail_preprw:
 484         goto out_free;
 485 }
 486
 487 static int ost_brw(struct ost_obd *obddev, struct ptlrpc_request *req)
 488 {
 489         struct ost_body *body = lustre_msg_buf(req->rq_reqmsg, 0);
 490
 491         if (body->data == OBD_BRW_READ)
 492                 return ost_brw_read(obddev, req);
 493         else
 494                 return ost_brw_write(obddev, req);
 495 }
 496
 497 static int ost_handle(struct obd_device *obddev, struct ptlrpc_service *svc,
 498                       struct ptlrpc_request *req)
 499 {
 500         int rc;
 501         struct ost_obd *ost = &obddev->u.ost;
 502         ENTRY;
 503
 504         rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
 505         if (rc || OBD_FAIL_CHECK(OBD_FAIL_MDS_HANDLE_UNPACK)) {
 506                 CERROR("lustre_mds: Invalid request\n");
 507                 GOTO(out, rc);
 508         }
 509
 510         if (req->rq_reqmsg->type != PTL_RPC_MSG_REQUEST) {
 511                 CERROR("lustre_mds: wrong packet type sent %d\n",
 512                        req->rq_reqmsg->type);
 513                 GOTO(out, rc = -EINVAL);
 514         }
 515
 516         switch (req->rq_reqmsg->opc) {
 517         case OST_CONNECT:
 518                 CDEBUG(D_INODE, "connect\n");
 519                 OBD_FAIL_RETURN(OBD_FAIL_OST_CONNECT_NET, 0);
 520                 rc = ost_connect(ost, req);
 521                 break;
 522         case OST_DISCONNECT:
 523                 CDEBUG(D_INODE, "disconnect\n");
 524                 OBD_FAIL_RETURN(OBD_FAIL_OST_DISCONNECT_NET, 0);
 525                 rc = ost_disconnect(ost, req);
 526                 break;
 527         case OST_GET_INFO:
 528                 CDEBUG(D_INODE, "get_info\n");
 529                 OBD_FAIL_RETURN(OBD_FAIL_OST_GET_INFO_NET, 0);
 530                 rc = ost_get_info(ost, req);
 531                 break;
 532         case OST_CREATE:
 533                 CDEBUG(D_INODE, "create\n");
 534                 OBD_FAIL_RETURN(OBD_FAIL_OST_CREATE_NET, 0);
 535                 rc = ost_create(ost, req);
 536                 break;
 537         case OST_DESTROY:
 538                 CDEBUG(D_INODE, "destroy\n");
 539                 OBD_FAIL_RETURN(OBD_FAIL_OST_DESTROY_NET, 0);
 540                 rc = ost_destroy(ost, req);
 541                 break;
 542         case OST_GETATTR:
 543                 CDEBUG(D_INODE, "getattr\n");
 544                 OBD_FAIL_RETURN(OBD_FAIL_OST_GETATTR_NET, 0);
 545                 rc = ost_getattr(ost, req);
 546                 break;
 547         case OST_SETATTR:
 548                 CDEBUG(D_INODE, "setattr\n");
 549                 OBD_FAIL_RETURN(OBD_FAIL_OST_SETATTR_NET, 0);
 550                 rc = ost_setattr(ost, req);
 551                 break;
 552         case OST_OPEN:
 553                 CDEBUG(D_INODE, "setattr\n");
 554                 OBD_FAIL_RETURN(OBD_FAIL_OST_OPEN_NET, 0);
 555                 rc = ost_open(ost, req);
 556                 break;
 557         case OST_CLOSE:
 558                 CDEBUG(D_INODE, "setattr\n");
 559                 OBD_FAIL_RETURN(OBD_FAIL_OST_CLOSE_NET, 0);
 560                 rc = ost_close(ost, req);
 561                 break;
 562         case OST_BRW:
 563                 CDEBUG(D_INODE, "brw\n");
 564                 OBD_FAIL_RETURN(OBD_FAIL_OST_BRW_NET, 0);
 565                 rc = ost_brw(ost, req);
 566                 break;
 567         case OST_PUNCH:
 568                 CDEBUG(D_INODE, "punch\n");
 569                 OBD_FAIL_RETURN(OBD_FAIL_OST_PUNCH_NET, 0);
 570                 rc = ost_punch(ost, req);
 571                 break;
 572         default:
 573                 req->rq_status = -ENOTSUPP;
 574                 rc = ptlrpc_error(svc, req);
 575                 RETURN(rc);
 576         }
 577
 578         EXIT;
 579 out:
 580         //req->rq_status = rc;
 581         if (rc) {
 582                 CERROR("ost: processing error %d\n", rc);
 583                 ptlrpc_error(svc, req);
 584         } else {
 585                 CDEBUG(D_INODE, "sending reply\n");
 586                 ptlrpc_reply(svc, req);
 587         }
 588
 589         return 0;
 590 }
 591
 592 /* mount the file system (secretly) */
 593 static int ost_setup(struct obd_device *obddev, obd_count len, void *buf)
 594 {
 595         struct obd_ioctl_data* data = buf;
 596         struct ost_obd *ost = &obddev->u.ost;
 597         struct obd_device *tgt;
 598         int err;
 599         ENTRY;
 600
 601         if (data->ioc_dev < 0 || data->ioc_dev > MAX_OBD_DEVICES)
 602                 RETURN(-ENODEV);
 603
 604         MOD_INC_USE_COUNT;
 605         tgt = &obd_dev[data->ioc_dev];
 606         ost->ost_tgt = tgt;
 607         if (!(tgt->obd_flags & OBD_ATTACHED) ||
 608             !(tgt->obd_flags & OBD_SET_UP)) {
 609                 CERROR("device not attached or not set up (%d)\n",
 610                        data->ioc_dev);
 611                 GOTO(error_dec, err = -EINVAL);
 612         }
 613
 614         ost->ost_conn.oc_dev = tgt;
 615         err = obd_connect(&ost->ost_conn);
 616         if (err) {
 617                 CERROR("fail to connect to device %d\n", data->ioc_dev);
 618                 GOTO(error_dec, err = -EINVAL);
 619         }
 620
 621         ost->ost_service = ptlrpc_init_svc(128 * 1024,
 622                                            OST_REQUEST_PORTAL, OSC_REPLY_PORTAL,
 623                                            "self", ost_handle);
 624         if (!ost->ost_service) {
 625                 CERROR("failed to start service\n");
 626                 GOTO(error_disc, err = -EINVAL);
 627         }
 628
 629         err = ptlrpc_start_thread(obddev, ost->ost_service, "lustre_ost");
 630         if (err)
 631                 GOTO(error_disc, err = -EINVAL);
 632         err = ptlrpc_start_thread(obddev, ost->ost_service, "lustre_ost");
 633         if (err)
 634                 GOTO(error_disc, err = -EINVAL);
 635
 636         RETURN(0);
 637
 638 error_disc:
 639         obd_disconnect(&ost->ost_conn);
 640 error_dec:
 641         MOD_DEC_USE_COUNT;
 642         RETURN(err);
 643 }
 644
 645 static int ost_cleanup(struct obd_device * obddev)
 646 {
 647         struct ost_obd *ost = &obddev->u.ost;
 648         int err;
 649
 650         ENTRY;
 651
 652         if ( !list_empty(&obddev->obd_gen_clients) ) {
 653                 CERROR("still has clients!\n");
 654                 RETURN(-EBUSY);
 655         }
 656
 657         ptlrpc_stop_all_threads(ost->ost_service);
 658         rpc_unregister_service(ost->ost_service);
 659
 660         if (!list_empty(&ost->ost_service->srv_reqs)) {
 661                 // XXX reply with errors and clean up
 662                 CERROR("Request list not empty!\n");
 663         }
 664         OBD_FREE(ost->ost_service, sizeof(*ost->ost_service));
 665
 666         err = obd_disconnect(&ost->ost_conn);
 667         if (err) {
 668                 CERROR("lustre ost: fail to disconnect device\n");
 669                 RETURN(-EINVAL);
 670         }
 671
 672         MOD_DEC_USE_COUNT;
 673         RETURN(0);
 674 }
 675
 676 /* use obd ops to offer management infrastructure */
 677 static struct obd_ops ost_obd_ops = {
 678         o_setup:       ost_setup,
 679         o_cleanup:     ost_cleanup,
 680 };
 681
 682 static int __init ost_init(void)
 683 {
 684         obd_register_type(&ost_obd_ops, LUSTRE_OST_NAME);
 685         return 0;
 686 }
 687
 688 static void __exit ost_exit(void)
 689 {
 690         obd_unregister_type(LUSTRE_OST_NAME);
 691 }
 692
 693 MODULE_AUTHOR("Peter J. Braam <braam@clusterfs.com>");
 694 MODULE_DESCRIPTION("Lustre Object Storage Target (OST) v0.01");
 695 MODULE_LICENSE("GPL");
 696
 697 module_init(ost_init);
 698 module_exit(ost_exit);