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