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