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 #include <linux/init.h>
  41
  42 static int ost_destroy(struct ptlrpc_request *req)
  43 {
  44         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
  45         struct ost_body *body;
  46         int rc, size = sizeof(*body);
  47         ENTRY;
  48
  49         body = lustre_msg_buf(req->rq_reqmsg, 0);
  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, NULL);
  56         RETURN(0);
  57 }
  58
  59 static int ost_getattr(struct ptlrpc_request *req)
  60 {
  61         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
  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
  68         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
  69         if (rc)
  70                 RETURN(rc);
  71
  72         repbody = lustre_msg_buf(req->rq_repmsg, 0);
  73         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
  74         req->rq_status = obd_getattr(conn, &repbody->oa, NULL);
  75         RETURN(0);
  76 }
  77
  78 static int ost_statfs(struct ptlrpc_request *req)
  79 {
  80         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
  81         struct obd_statfs *osfs;
  82         struct statfs sfs;
  83         int rc, size = sizeof(*osfs);
  84         ENTRY;
  85
  86         rc = obd_statfs(conn, &sfs);
  87         if (rc) {
  88                 CERROR("ost: statfs failed: rc %d\n", rc);
  89                 req->rq_status = rc;
  90                 RETURN(rc);
  91         }
  92
  93         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
  94         if (rc)
  95                 RETURN(rc);
  96
  97         osfs = lustre_msg_buf(req->rq_repmsg, 0);
  98         memset(osfs, 0, size);
  99         obd_statfs_pack(osfs, &sfs);
 100         RETURN(0);
 101 }
 102
 103 static int ost_open(struct ptlrpc_request *req)
 104 {
 105         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 106         struct ost_body *body, *repbody;
 107         int rc, size = sizeof(*body);
 108         ENTRY;
 109
 110         body = lustre_msg_buf(req->rq_reqmsg, 0);
 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_open(conn, &repbody->oa, NULL);
 119         RETURN(0);
 120 }
 121
 122 static int ost_close(struct ptlrpc_request *req)
 123 {
 124         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 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
 131         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 132         if (rc)
 133                 RETURN(rc);
 134
 135         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 136         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 137         req->rq_status = obd_close(conn, &repbody->oa, NULL);
 138         RETURN(0);
 139 }
 140
 141 static int ost_create(struct ptlrpc_request *req)
 142 {
 143         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 144         struct ost_body *body, *repbody;
 145         int rc, size = sizeof(*body);
 146         ENTRY;
 147
 148         body = lustre_msg_buf(req->rq_reqmsg, 0);
 149
 150         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 151         if (rc)
 152                 RETURN(rc);
 153
 154         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 155         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 156         req->rq_status = obd_create(conn, &repbody->oa, NULL);
 157         RETURN(0);
 158 }
 159
 160 static int ost_punch(struct ptlrpc_request *req)
 161 {
 162         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 163         struct ost_body *body, *repbody;
 164         int rc, size = sizeof(*body);
 165         ENTRY;
 166
 167         body = lustre_msg_buf(req->rq_reqmsg, 0);
 168
 169         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 170         if (rc)
 171                 RETURN(rc);
 172
 173         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 174         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 175         req->rq_status = obd_punch(conn, &repbody->oa, NULL,
 176                                    repbody->oa.o_blocks, repbody->oa.o_size);
 177         RETURN(0);
 178 }
 179
 180 static int ost_setattr(struct ptlrpc_request *req)
 181 {
 182         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 183         struct ost_body *body, *repbody;
 184         int rc, size = sizeof(*body);
 185         ENTRY;
 186
 187         body = lustre_msg_buf(req->rq_reqmsg, 0);
 188
 189         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 190         if (rc)
 191                 RETURN(rc);
 192
 193         repbody = lustre_msg_buf(req->rq_repmsg, 0);
 194         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 195         req->rq_status = obd_setattr(conn, &repbody->oa, NULL);
 196         RETURN(0);
 197 }
 198
 199 static int ost_bulk_timeout(void *data)
 200 {
 201         struct ptlrpc_bulk_desc *desc = data;
 202
 203         ENTRY;
 204         CERROR("(not yet) starting recovery of client %p\n", desc->b_client);
 205         RETURN(1);
 206 }
 207
 208 static int ost_brw_read(struct ptlrpc_request *req)
 209 {
 210         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 211         struct ptlrpc_bulk_desc *desc;
 212         void *tmp1, *tmp2, *end2;
 213         struct niobuf_remote *remote_nb;
 214         struct niobuf_local *local_nb = NULL;
 215         struct obd_ioobj *ioo;
 216         struct ost_body *body;
 217         struct l_wait_info lwi;
 218         int rc, cmd, i, j, objcount, niocount, size = sizeof(*body);
 219         ENTRY;
 220
 221         body = lustre_msg_buf(req->rq_reqmsg, 0);
 222         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 223         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 224         end2 = (char *)tmp2 + req->rq_reqmsg->buflens[2];
 225         objcount = req->rq_reqmsg->buflens[1] / sizeof(*ioo);
 226         niocount = req->rq_reqmsg->buflens[2] / sizeof(*remote_nb);
 227         cmd = OBD_BRW_READ;
 228
 229         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_READ_BULK))
 230                 GOTO(out, rc = 0);
 231
 232         for (i = 0; i < objcount; i++) {
 233                 ost_unpack_ioo(&tmp1, &ioo);
 234                 if (tmp2 + ioo->ioo_bufcnt > end2) {
 235                         LBUG();
 236                         GOTO(out, rc = -EFAULT);
 237                 }
 238                 for (j = 0; j < ioo->ioo_bufcnt; j++)
 239                         ost_unpack_niobuf(&tmp2, &remote_nb);
 240         }
 241
 242         OBD_ALLOC(local_nb, sizeof(*local_nb) * niocount);
 243         if (local_nb == NULL)
 244                 GOTO(out, rc = -ENOMEM);
 245
 246         /* The unpackers move tmp1 and tmp2, so reset them before using */
 247         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 248         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 249         req->rq_status = obd_preprw(cmd, conn, objcount,
 250                                     tmp1, niocount, tmp2, local_nb, NULL);
 251
 252         if (req->rq_status)
 253                 GOTO(out, 0);
 254
 255         desc = ptlrpc_prep_bulk(req->rq_connection);
 256         if (desc == NULL)
 257                 GOTO(out_local, rc = -ENOMEM);
 258         desc->b_portal = OST_BULK_PORTAL;
 259
 260         for (i = 0; i < niocount; i++) {
 261                 struct ptlrpc_bulk_page *bulk;
 262                 bulk = ptlrpc_prep_bulk_page(desc);
 263                 if (bulk == NULL)
 264                         GOTO(out_bulk, rc = -ENOMEM);
 265                 remote_nb = &(((struct niobuf_remote *)tmp2)[i]);
 266                 bulk->b_xid = remote_nb->xid;
 267                 bulk->b_buf = (void *)(unsigned long)local_nb[i].addr;
 268                 bulk->b_buflen = PAGE_SIZE;
 269         }
 270
 271         rc = ptlrpc_send_bulk(desc);
 272         if (rc)
 273                 GOTO(out_bulk, rc);
 274
 275         lwi = LWI_TIMEOUT(obd_timeout * HZ, ost_bulk_timeout, desc);
 276         rc = l_wait_event(desc->b_waitq, desc->b_flags & PTL_BULK_FL_SENT, &lwi);
 277         if (rc) {
 278                 LASSERT(rc == -ETIMEDOUT);
 279                 GOTO(out_bulk, rc);
 280         }
 281
 282         /* The unpackers move tmp1 and tmp2, so reset them before using */
 283         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 284         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 285         req->rq_status = obd_commitrw(cmd, conn, objcount,
 286                                       tmp1, niocount, local_nb, NULL);
 287
 288         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 289
 290 out_bulk:
 291         ptlrpc_free_bulk(desc);
 292 out_local:
 293         OBD_FREE(local_nb, sizeof(*local_nb) * niocount);
 294 out:
 295         if (rc)
 296                 ptlrpc_error(req->rq_svc, req);
 297         else
 298                 ptlrpc_reply(req->rq_svc, req);
 299         RETURN(rc);
 300 }
 301
 302 static int ost_brw_write(struct ptlrpc_request *req)
 303 {
 304         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 305         struct ptlrpc_bulk_desc *desc;
 306         struct niobuf_remote *remote_nb;
 307         struct niobuf_local *local_nb, *lnb;
 308         struct obd_ioobj *ioo;
 309         struct ost_body *body;
 310         int cmd, rc, i, j, objcount, niocount, size[2] = {sizeof(*body)};
 311         void *tmp1, *tmp2, *end2;
 312         void *desc_priv = NULL;
 313         int reply_sent = 0;
 314         struct ptlrpc_service *srv;
 315         struct l_wait_info lwi;
 316         __u32 xid;
 317         ENTRY;
 318
 319         body = lustre_msg_buf(req->rq_reqmsg, 0);
 320         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 321         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 322         end2 = (char *)tmp2 + req->rq_reqmsg->buflens[2];
 323         objcount = req->rq_reqmsg->buflens[1] / sizeof(*ioo);
 324         niocount = req->rq_reqmsg->buflens[2] / sizeof(*remote_nb);
 325         cmd = OBD_BRW_WRITE;
 326
 327         for (i = 0; i < objcount; i++) {
 328                 ost_unpack_ioo((void *)&tmp1, &ioo);
 329                 if (tmp2 + ioo->ioo_bufcnt > end2) {
 330                         rc = -EFAULT;
 331                         break;
 332                 }
 333                 for (j = 0; j < ioo->ioo_bufcnt; j++)
 334                         ost_unpack_niobuf((void *)&tmp2, &remote_nb);
 335         }
 336
 337         size[1] = niocount * sizeof(*remote_nb);
 338         rc = lustre_pack_msg(2, size, NULL, &req->rq_replen, &req->rq_repmsg);
 339         if (rc)
 340                 GOTO(out, rc);
 341         remote_nb = lustre_msg_buf(req->rq_repmsg, 1);
 342
 343         OBD_ALLOC(local_nb, niocount * sizeof(*local_nb));
 344         if (local_nb == NULL)
 345                 GOTO(out, rc = -ENOMEM);
 346
 347         /* The unpackers move tmp1 and tmp2, so reset them before using */
 348         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 349         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 350         req->rq_status = obd_preprw(cmd, conn, objcount,
 351                                     tmp1, niocount, tmp2, local_nb, &desc_priv);
 352         if (req->rq_status)
 353                 GOTO(out_free, rc = 0); /* XXX is this correct? */
 354
 355         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK))
 356                 GOTO(fail_preprw, rc = 0);
 357
 358         desc = ptlrpc_prep_bulk(req->rq_connection);
 359         if (desc == NULL)
 360                 GOTO(fail_preprw, rc = -ENOMEM);
 361         desc->b_cb = NULL;
 362         desc->b_portal = OSC_BULK_PORTAL;
 363         desc->b_desc_private = desc_priv;
 364         memcpy(&(desc->b_conn), &conn, sizeof(conn));
 365
 366         srv = req->rq_obd->u.ost.ost_service;
 367         spin_lock(&srv->srv_lock);
 368         xid = srv->srv_xid++;                   /* single xid for all pages */
 369         spin_unlock(&srv->srv_lock);
 370
 371         for (i = 0, lnb = local_nb; i < niocount; i++, lnb++) {
 372                 struct ptlrpc_bulk_page *bulk;
 373
 374                 bulk = ptlrpc_prep_bulk_page(desc);
 375                 if (bulk == NULL)
 376                         GOTO(fail_bulk, rc = -ENOMEM);
 377
 378                 bulk->b_xid = xid;              /* single xid for all pages */
 379
 380                 bulk->b_buf = lnb->addr;
 381                 bulk->b_page = lnb->page;
 382                 bulk->b_flags = lnb->flags;
 383                 bulk->b_dentry = lnb->dentry;
 384                 bulk->b_buflen = PAGE_SIZE;
 385                 bulk->b_cb = NULL;
 386
 387                 /* this advances remote_nb */
 388                 ost_pack_niobuf((void **)&remote_nb, lnb->offset, lnb->len, 0,
 389                                 bulk->b_xid);
 390         }
 391
 392         rc = ptlrpc_register_bulk(desc);
 393         if (rc)
 394                 GOTO(fail_bulk, rc);
 395
 396         reply_sent = 1;
 397         ptlrpc_reply(req->rq_svc, req);
 398
 399         lwi = LWI_TIMEOUT(obd_timeout * HZ, ost_bulk_timeout, desc);
 400         rc = l_wait_event(desc->b_waitq, desc->b_flags & PTL_BULK_FL_RCVD, &lwi);
 401         if (rc) {
 402                 if (rc != -ETIMEDOUT)
 403                         LBUG();
 404                 GOTO(fail_bulk, rc);
 405         }
 406
 407         rc = obd_commitrw(cmd, conn, objcount, tmp1, niocount, local_nb,
 408                           desc->b_desc_private);
 409         ptlrpc_free_bulk(desc);
 410         EXIT;
 411 out_free:
 412         OBD_FREE(local_nb, niocount * sizeof(*local_nb));
 413 out:
 414         if (!reply_sent) {
 415                 if (rc)
 416                         ptlrpc_error(req->rq_svc, req);
 417                 else
 418                         ptlrpc_reply(req->rq_svc, req);
 419         }
 420         return rc;
 421
 422 fail_bulk:
 423         ptlrpc_free_bulk(desc);
 424 fail_preprw:
 425         /* FIXME: how do we undo the preprw? */
 426         goto out_free;
 427 }
 428
 429 static int ost_handle(struct ptlrpc_request *req)
 430 {
 431         int rc;
 432         ENTRY;
 433
 434         rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
 435         if (rc || OBD_FAIL_CHECK(OBD_FAIL_OST_HANDLE_UNPACK)) {
 436                 CERROR("lustre_ost: Invalid request\n");
 437                 GOTO(out, rc);
 438         }
 439
 440         if (req->rq_reqmsg->type != PTL_RPC_MSG_REQUEST) {
 441                 CERROR("lustre_ost: wrong packet type sent %d\n",
 442                        req->rq_reqmsg->type);
 443                 GOTO(out, rc = -EINVAL);
 444         }
 445
 446         if (req->rq_reqmsg->opc != OST_CONNECT &&
 447             req->rq_export == NULL) {
 448                 CERROR("lustre_ost: operation %d on unconnected OST\n",
 449                        req->rq_reqmsg->opc);
 450                 GOTO(out, rc = -ENOTCONN);
 451         }
 452
 453         if (strcmp(req->rq_obd->obd_type->typ_name, "ost") != 0)
 454                 GOTO(out, rc = -EINVAL);
 455
 456         switch (req->rq_reqmsg->opc) {
 457         case OST_CONNECT:
 458                 CDEBUG(D_INODE, "connect\n");
 459                 OBD_FAIL_RETURN(OBD_FAIL_OST_CONNECT_NET, 0);
 460                 rc = target_handle_connect(req);
 461                 break;
 462         case OST_DISCONNECT:
 463                 CDEBUG(D_INODE, "disconnect\n");
 464                 OBD_FAIL_RETURN(OBD_FAIL_OST_DISCONNECT_NET, 0);
 465                 rc = target_handle_disconnect(req);
 466                 break;
 467         case OST_CREATE:
 468                 CDEBUG(D_INODE, "create\n");
 469                 OBD_FAIL_RETURN(OBD_FAIL_OST_CREATE_NET, 0);
 470                 rc = ost_create(req);
 471                 break;
 472         case OST_DESTROY:
 473                 CDEBUG(D_INODE, "destroy\n");
 474                 OBD_FAIL_RETURN(OBD_FAIL_OST_DESTROY_NET, 0);
 475                 rc = ost_destroy(req);
 476                 break;
 477         case OST_GETATTR:
 478                 CDEBUG(D_INODE, "getattr\n");
 479                 OBD_FAIL_RETURN(OBD_FAIL_OST_GETATTR_NET, 0);
 480                 rc = ost_getattr(req);
 481                 break;
 482         case OST_SETATTR:
 483                 CDEBUG(D_INODE, "setattr\n");
 484                 OBD_FAIL_RETURN(OBD_FAIL_OST_SETATTR_NET, 0);
 485                 rc = ost_setattr(req);
 486                 break;
 487         case OST_OPEN:
 488                 CDEBUG(D_INODE, "setattr\n");
 489                 OBD_FAIL_RETURN(OBD_FAIL_OST_OPEN_NET, 0);
 490                 rc = ost_open(req);
 491                 break;
 492         case OST_CLOSE:
 493                 CDEBUG(D_INODE, "setattr\n");
 494                 OBD_FAIL_RETURN(OBD_FAIL_OST_CLOSE_NET, 0);
 495                 rc = ost_close(req);
 496                 break;
 497         case OST_WRITE:
 498                 CDEBUG(D_INODE, "write\n");
 499                 OBD_FAIL_RETURN(OBD_FAIL_OST_BRW_NET, 0);
 500                 rc = ost_brw_write(req);
 501                 /* ost_brw sends its own replies */
 502                 RETURN(rc);
 503         case OST_READ:
 504                 CDEBUG(D_INODE, "read\n");
 505                 OBD_FAIL_RETURN(OBD_FAIL_OST_BRW_NET, 0);
 506                 rc = ost_brw_read(req);
 507                 /* ost_brw sends its own replies */
 508                 RETURN(rc);
 509         case OST_PUNCH:
 510                 CDEBUG(D_INODE, "punch\n");
 511                 OBD_FAIL_RETURN(OBD_FAIL_OST_PUNCH_NET, 0);
 512                 rc = ost_punch(req);
 513                 break;
 514         case OST_STATFS:
 515                 CDEBUG(D_INODE, "statfs\n");
 516                 OBD_FAIL_RETURN(OBD_FAIL_OST_STATFS_NET, 0);
 517                 rc = ost_statfs(req);
 518                 break;
 519         case LDLM_ENQUEUE:
 520                 CDEBUG(D_INODE, "enqueue\n");
 521                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_ENQUEUE, 0);
 522                 rc = ldlm_handle_enqueue(req);
 523                 if (rc)
 524                         break;
 525                 RETURN(0);
 526         case LDLM_CONVERT:
 527                 CDEBUG(D_INODE, "convert\n");
 528                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CONVERT, 0);
 529                 rc = ldlm_handle_convert(req);
 530                 if (rc)
 531                         break;
 532                 RETURN(0);
 533         case LDLM_CANCEL:
 534                 CDEBUG(D_INODE, "cancel\n");
 535                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CANCEL, 0);
 536                 rc = ldlm_handle_cancel(req);
 537                 if (rc)
 538                         break;
 539                 RETURN(0);
 540         case LDLM_BL_CALLBACK:
 541         case LDLM_CP_CALLBACK:
 542                 CDEBUG(D_INODE, "callback\n");
 543                 CERROR("callbacks should not happen on OST\n");
 544                 LBUG();
 545                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
 546                 break;
 547         default:
 548                 req->rq_status = -ENOTSUPP;
 549                 rc = ptlrpc_error(req->rq_svc, req);
 550                 RETURN(rc);
 551         }
 552
 553         EXIT;
 554 out:
 555         //req->rq_status = rc;
 556         if (rc) {
 557                 CERROR("ost: processing error (opcode=%d): %d\n",
 558                        req->rq_reqmsg->opc, rc);
 559                 ptlrpc_error(req->rq_svc, req);
 560         } else {
 561                 CDEBUG(D_INODE, "sending reply\n");
 562                 if (req->rq_repmsg == NULL)
 563                         CERROR("handler for opcode %d returned rc=0 without "
 564                                "creating rq_repmsg; needs to return rc != "
 565                                "0!\n", req->rq_reqmsg->opc);
 566                 ptlrpc_reply(req->rq_svc, req);
 567         }
 568
 569         return 0;
 570 }
 571
 572 #define OST_NUM_THREADS 6
 573
 574 /* mount the file system (secretly) */
 575 static int ost_setup(struct obd_device *obddev, obd_count len, void *buf)
 576 {
 577         struct obd_ioctl_data* data = buf;
 578         struct ost_obd *ost = &obddev->u.ost;
 579         struct obd_device *tgt;
 580         int err;
 581         int i;
 582         ENTRY;
 583
 584         if (data->ioc_inllen1 < 1) {
 585                 CERROR("requires a TARGET OBD UUID\n");
 586                 RETURN(-EINVAL);
 587         }
 588         if (data->ioc_inllen1 > 37) {
 589                 CERROR("OBD UUID must be less than 38 characters\n");
 590                 RETURN(-EINVAL);
 591         }
 592
 593         MOD_INC_USE_COUNT;
 594         tgt = class_uuid2obd(data->ioc_inlbuf1);
 595         if (!tgt || !(tgt->obd_flags & OBD_ATTACHED) ||
 596             !(tgt->obd_flags & OBD_SET_UP)) {
 597                 CERROR("device not attached or not set up (%d)\n",
 598                        data->ioc_dev);
 599                 GOTO(error_dec, err = -EINVAL);
 600         }
 601
 602         err = obd_connect(&ost->ost_conn, tgt, NULL);
 603         if (err) {
 604                 CERROR("fail to connect to device %d\n", data->ioc_dev);
 605                 GOTO(error_dec, err = -EINVAL);
 606         }
 607
 608         ost->ost_service = ptlrpc_init_svc(64 * 1024, OST_REQUEST_PORTAL,
 609                                            OSC_REPLY_PORTAL, "self",ost_handle);
 610         if (!ost->ost_service) {
 611                 CERROR("failed to start service\n");
 612                 GOTO(error_disc, err = -EINVAL);
 613         }
 614
 615         for (i = 0; i < OST_NUM_THREADS; i++) {
 616                 char name[32];
 617                 sprintf(name, "lustre_ost_%02d", i);
 618                 err = ptlrpc_start_thread(obddev, ost->ost_service, name);
 619                 if (err) {
 620                         CERROR("error starting thread #%d: rc %d\n", i, err);
 621                         GOTO(error_disc, err = -EINVAL);
 622                 }
 623         }
 624
 625         RETURN(0);
 626
 627 error_disc:
 628         obd_disconnect(&ost->ost_conn);
 629 error_dec:
 630         MOD_DEC_USE_COUNT;
 631         RETURN(err);
 632 }
 633
 634 static int ost_cleanup(struct obd_device * obddev)
 635 {
 636         struct ost_obd *ost = &obddev->u.ost;
 637         int err;
 638
 639         ENTRY;
 640
 641         if ( !list_empty(&obddev->obd_exports) ) {
 642                 CERROR("still has clients!\n");
 643                 RETURN(-EBUSY);
 644         }
 645
 646         ptlrpc_stop_all_threads(ost->ost_service);
 647         ptlrpc_unregister_service(ost->ost_service);
 648
 649         err = obd_disconnect(&ost->ost_conn);
 650         if (err) {
 651                 CERROR("lustre ost: fail to disconnect device\n");
 652                 RETURN(-EINVAL);
 653         }
 654
 655         MOD_DEC_USE_COUNT;
 656         RETURN(0);
 657 }
 658
 659 /* use obd ops to offer management infrastructure */
 660 static struct obd_ops ost_obd_ops = {
 661         o_setup:       ost_setup,
 662         o_cleanup:     ost_cleanup,
 663 };
 664
 665 static int __init ost_init(void)
 666 {
 667         class_register_type(&ost_obd_ops, LUSTRE_OST_NAME);
 668         return 0;
 669 }
 670
 671 static void __exit ost_exit(void)
 672 {
 673         class_unregister_type(LUSTRE_OST_NAME);
 674 }
 675
 676 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 677 MODULE_DESCRIPTION("Lustre Object Storage Target (OST) v0.01");
 678 MODULE_LICENSE("GPL");
 679
 680 module_init(ost_init);
 681 module_exit(ost_exit);