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         int rc, size = sizeof(*osfs);
  83         ENTRY;
  84
  85         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
  86         if (rc)
  87                 RETURN(rc);
  88
  89         osfs = lustre_msg_buf(req->rq_repmsg, 0);
  90         memset(osfs, 0, size);
  91
  92         rc = obd_statfs(conn, osfs);
  93         if (rc) {
  94                 CERROR("ost: statfs failed: rc %d\n", rc);
  95                 req->rq_status = rc;
  96                 RETURN(rc);
  97         }
  98         obd_statfs_pack(osfs, osfs);
  99
 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->bd_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->bd_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->bp_xid = remote_nb[i].xid;
 267                 bulk->bp_buf = local_nb[i].addr;
 268                 bulk->bp_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->bd_waitq, desc->bd_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                 /* It's a lot of work to delay allocating the reply, and a lot
 294                  * less work to just free it here. */
 295                 OBD_FREE(req->rq_repmsg, req->rq_replen);
 296                 req->rq_repmsg = NULL;
 297                 ptlrpc_error(req->rq_svc, req);
 298         } else
 299                 ptlrpc_reply(req->rq_svc, req);
 300         RETURN(rc);
 301 }
 302
 303 static int ost_brw_write(struct ptlrpc_request *req)
 304 {
 305         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 306         struct ptlrpc_bulk_desc *desc;
 307         struct niobuf_remote *remote_nb;
 308         struct niobuf_local *local_nb, *lnb;
 309         struct obd_ioobj *ioo;
 310         struct ost_body *body;
 311         int cmd, rc, i, j, objcount, niocount, size[2] = {sizeof(*body)};
 312         void *tmp1, *tmp2, *end2;
 313         void *desc_priv = NULL;
 314         int reply_sent = 0;
 315         struct ptlrpc_service *srv;
 316         struct l_wait_info lwi;
 317         __u32 xid;
 318         ENTRY;
 319
 320         body = lustre_msg_buf(req->rq_reqmsg, 0);
 321         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 322         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 323         end2 = (char *)tmp2 + req->rq_reqmsg->buflens[2];
 324         objcount = req->rq_reqmsg->buflens[1] / sizeof(*ioo);
 325         niocount = req->rq_reqmsg->buflens[2] / sizeof(*remote_nb);
 326         cmd = OBD_BRW_WRITE;
 327
 328         for (i = 0; i < objcount; i++) {
 329                 ost_unpack_ioo((void *)&tmp1, &ioo);
 330                 if (tmp2 + ioo->ioo_bufcnt > end2) {
 331                         rc = -EFAULT;
 332                         break;
 333                 }
 334                 for (j = 0; j < ioo->ioo_bufcnt; j++)
 335                         ost_unpack_niobuf((void *)&tmp2, &remote_nb);
 336         }
 337
 338         size[1] = niocount * sizeof(*remote_nb);
 339         rc = lustre_pack_msg(2, size, NULL, &req->rq_replen, &req->rq_repmsg);
 340         if (rc)
 341                 GOTO(out, rc);
 342         remote_nb = lustre_msg_buf(req->rq_repmsg, 1);
 343
 344         OBD_ALLOC(local_nb, niocount * sizeof(*local_nb));
 345         if (local_nb == NULL)
 346                 GOTO(out, rc = -ENOMEM);
 347
 348         /* The unpackers move tmp1 and tmp2, so reset them before using */
 349         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 350         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 351         req->rq_status = obd_preprw(cmd, conn, objcount, tmp1, niocount, tmp2,
 352                                     local_nb, &desc_priv);
 353         if (req->rq_status)
 354                 GOTO(out_free, rc = 0); /* XXX is this correct? */
 355
 356         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK))
 357                 GOTO(fail_preprw, rc = 0);
 358
 359         desc = ptlrpc_prep_bulk(req->rq_connection);
 360         if (desc == NULL)
 361                 GOTO(fail_preprw, rc = -ENOMEM);
 362         desc->bd_cb = NULL;
 363         desc->bd_portal = OSC_BULK_PORTAL;
 364         desc->bd_desc_private = desc_priv;
 365         memcpy(&(desc->bd_conn), &conn, sizeof(conn));
 366
 367         srv = req->rq_obd->u.ost.ost_service;
 368         spin_lock(&srv->srv_lock);
 369         xid = srv->srv_xid++;                   /* single xid for all pages */
 370         spin_unlock(&srv->srv_lock);
 371
 372         for (i = 0, lnb = local_nb; i < niocount; i++, lnb++) {
 373                 struct ptlrpc_bulk_page *bulk;
 374
 375                 bulk = ptlrpc_prep_bulk_page(desc);
 376                 if (bulk == NULL)
 377                         GOTO(fail_bulk, rc = -ENOMEM);
 378
 379                 bulk->bp_xid = xid;              /* single xid for all pages */
 380
 381                 bulk->bp_buf = lnb->addr;
 382                 bulk->bp_page = lnb->page;
 383                 bulk->bp_flags = lnb->flags;
 384                 bulk->bp_dentry = lnb->dentry;
 385                 bulk->bp_buflen = lnb->len;
 386                 bulk->bp_cb = NULL;
 387
 388                 /* this advances remote_nb */
 389                 ost_pack_niobuf((void **)&remote_nb, lnb->offset, lnb->len, 0,
 390                                 bulk->bp_xid);
 391         }
 392
 393         rc = ptlrpc_register_bulk(desc);
 394         if (rc)
 395                 GOTO(fail_bulk, rc);
 396
 397         reply_sent = 1;
 398         ptlrpc_reply(req->rq_svc, req);
 399
 400         lwi = LWI_TIMEOUT(obd_timeout * HZ, ost_bulk_timeout, desc);
 401         rc = l_wait_event(desc->bd_waitq, desc->bd_flags & PTL_BULK_FL_RCVD,
 402                           &lwi);
 403         if (rc) {
 404                 if (rc != -ETIMEDOUT)
 405                         LBUG();
 406                 GOTO(fail_bulk, rc);
 407         }
 408
 409         rc = obd_commitrw(cmd, conn, objcount, tmp1, niocount, local_nb,
 410                           desc->bd_desc_private);
 411         ptlrpc_free_bulk(desc);
 412         EXIT;
 413 out_free:
 414         OBD_FREE(local_nb, niocount * sizeof(*local_nb));
 415 out:
 416         if (!reply_sent) {
 417                 if (rc) {
 418                         OBD_FREE(req->rq_repmsg, req->rq_replen);
 419                         req->rq_repmsg = NULL;
 420                         ptlrpc_error(req->rq_svc, req);
 421                 } else
 422                         ptlrpc_reply(req->rq_svc, req);
 423         }
 424         return rc;
 425
 426 fail_bulk:
 427         ptlrpc_free_bulk(desc);
 428 fail_preprw:
 429         /* FIXME: how do we undo the preprw? */
 430         goto out_free;
 431 }
 432
 433 static int ost_handle(struct ptlrpc_request *req)
 434 {
 435         int rc;
 436         ENTRY;
 437
 438         rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
 439         if (rc || OBD_FAIL_CHECK(OBD_FAIL_OST_HANDLE_UNPACK)) {
 440                 CERROR("lustre_ost: Invalid request\n");
 441                 GOTO(out, rc);
 442         }
 443
 444         if (req->rq_reqmsg->opc != OST_CONNECT &&
 445             req->rq_export == NULL) {
 446                 CERROR("lustre_ost: operation %d on unconnected OST\n",
 447                        req->rq_reqmsg->opc);
 448                 GOTO(out, rc = -ENOTCONN);
 449         }
 450
 451         if (strcmp(req->rq_obd->obd_type->typ_name, "ost") != 0)
 452                 GOTO(out, rc = -EINVAL);
 453
 454         switch (req->rq_reqmsg->opc) {
 455         case OST_CONNECT:
 456                 CDEBUG(D_INODE, "connect\n");
 457                 OBD_FAIL_RETURN(OBD_FAIL_OST_CONNECT_NET, 0);
 458                 rc = target_handle_connect(req);
 459                 break;
 460         case OST_DISCONNECT:
 461                 CDEBUG(D_INODE, "disconnect\n");
 462                 OBD_FAIL_RETURN(OBD_FAIL_OST_DISCONNECT_NET, 0);
 463                 rc = target_handle_disconnect(req);
 464                 break;
 465         case OST_CREATE:
 466                 CDEBUG(D_INODE, "create\n");
 467                 OBD_FAIL_RETURN(OBD_FAIL_OST_CREATE_NET, 0);
 468                 rc = ost_create(req);
 469                 break;
 470         case OST_DESTROY:
 471                 CDEBUG(D_INODE, "destroy\n");
 472                 OBD_FAIL_RETURN(OBD_FAIL_OST_DESTROY_NET, 0);
 473                 rc = ost_destroy(req);
 474                 break;
 475         case OST_GETATTR:
 476                 CDEBUG(D_INODE, "getattr\n");
 477                 OBD_FAIL_RETURN(OBD_FAIL_OST_GETATTR_NET, 0);
 478                 rc = ost_getattr(req);
 479                 break;
 480         case OST_SETATTR:
 481                 CDEBUG(D_INODE, "setattr\n");
 482                 OBD_FAIL_RETURN(OBD_FAIL_OST_SETATTR_NET, 0);
 483                 rc = ost_setattr(req);
 484                 break;
 485         case OST_OPEN:
 486                 CDEBUG(D_INODE, "open\n");
 487                 OBD_FAIL_RETURN(OBD_FAIL_OST_OPEN_NET, 0);
 488                 rc = ost_open(req);
 489                 break;
 490         case OST_CLOSE:
 491                 CDEBUG(D_INODE, "close\n");
 492                 OBD_FAIL_RETURN(OBD_FAIL_OST_CLOSE_NET, 0);
 493                 rc = ost_close(req);
 494                 break;
 495         case OST_WRITE:
 496                 CDEBUG(D_INODE, "write\n");
 497                 OBD_FAIL_RETURN(OBD_FAIL_OST_BRW_NET, 0);
 498                 rc = ost_brw_write(req);
 499                 /* ost_brw sends its own replies */
 500                 RETURN(rc);
 501         case OST_READ:
 502                 CDEBUG(D_INODE, "read\n");
 503                 OBD_FAIL_RETURN(OBD_FAIL_OST_BRW_NET, 0);
 504                 rc = ost_brw_read(req);
 505                 /* ost_brw sends its own replies */
 506                 RETURN(rc);
 507         case OST_PUNCH:
 508                 CDEBUG(D_INODE, "punch\n");
 509                 OBD_FAIL_RETURN(OBD_FAIL_OST_PUNCH_NET, 0);
 510                 rc = ost_punch(req);
 511                 break;
 512         case OST_STATFS:
 513                 CDEBUG(D_INODE, "statfs\n");
 514                 OBD_FAIL_RETURN(OBD_FAIL_OST_STATFS_NET, 0);
 515                 rc = ost_statfs(req);
 516                 break;
 517         case LDLM_ENQUEUE:
 518                 CDEBUG(D_INODE, "enqueue\n");
 519                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_ENQUEUE, 0);
 520                 rc = ldlm_handle_enqueue(req);
 521                 if (rc)
 522                         break;
 523                 RETURN(0);
 524         case LDLM_CONVERT:
 525                 CDEBUG(D_INODE, "convert\n");
 526                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CONVERT, 0);
 527                 rc = ldlm_handle_convert(req);
 528                 if (rc)
 529                         break;
 530                 RETURN(0);
 531         case LDLM_CANCEL:
 532                 CDEBUG(D_INODE, "cancel\n");
 533                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CANCEL, 0);
 534                 rc = ldlm_handle_cancel(req);
 535                 if (rc)
 536                         break;
 537                 RETURN(0);
 538         case LDLM_BL_CALLBACK:
 539         case LDLM_CP_CALLBACK:
 540                 CDEBUG(D_INODE, "callback\n");
 541                 CERROR("callbacks should not happen on OST\n");
 542                 LBUG();
 543                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
 544                 break;
 545         default:
 546                 req->rq_status = -ENOTSUPP;
 547                 rc = ptlrpc_error(req->rq_svc, req);
 548                 RETURN(rc);
 549         }
 550
 551         EXIT;
 552 out:
 553         //req->rq_status = rc;
 554         if (rc) {
 555                 CERROR("ost: processing error (opcode=%d): %d\n",
 556                        req->rq_reqmsg->opc, rc);
 557                 ptlrpc_error(req->rq_svc, req);
 558         } else {
 559                 CDEBUG(D_INODE, "sending reply\n");
 560                 if (req->rq_repmsg == NULL)
 561                         CERROR("handler for opcode %d returned rc=0 without "
 562                                "creating rq_repmsg; needs to return rc != "
 563                                "0!\n", req->rq_reqmsg->opc);
 564                 ptlrpc_reply(req->rq_svc, req);
 565         }
 566
 567         return 0;
 568 }
 569
 570 #define OST_NUM_THREADS 6
 571
 572 /* mount the file system (secretly) */
 573 static int ost_setup(struct obd_device *obddev, obd_count len, void *buf)
 574 {
 575         struct obd_ioctl_data* data = buf;
 576         struct ost_obd *ost = &obddev->u.ost;
 577         struct obd_device *tgt;
 578         int err;
 579         int i;
 580         ENTRY;
 581
 582         if (data->ioc_inllen1 < 1) {
 583                 CERROR("requires a TARGET OBD UUID\n");
 584                 RETURN(-EINVAL);
 585         }
 586         if (data->ioc_inllen1 > 37) {
 587                 CERROR("OBD UUID must be less than 38 characters\n");
 588                 RETURN(-EINVAL);
 589         }
 590
 591         MOD_INC_USE_COUNT;
 592         tgt = class_uuid2obd(data->ioc_inlbuf1);
 593         if (!tgt || !(tgt->obd_flags & OBD_ATTACHED) ||
 594             !(tgt->obd_flags & OBD_SET_UP)) {
 595                 CERROR("device not attached or not set up (%d)\n",
 596                        data->ioc_dev);
 597                 GOTO(error_dec, err = -EINVAL);
 598         }
 599
 600         err = obd_connect(&ost->ost_conn, tgt, NULL);
 601         if (err) {
 602                 CERROR("fail to connect to device %d\n", data->ioc_dev);
 603                 GOTO(error_dec, err = -EINVAL);
 604         }
 605
 606         ost->ost_service = ptlrpc_init_svc(OST_NEVENTS, OST_NBUFS,
 607                                            OST_BUFSIZE, OST_MAXREQSIZE,
 608                                            OST_REQUEST_PORTAL, OSC_REPLY_PORTAL,
 609                                            "self", ost_handle, "ost");
 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);