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         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 249         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 250         req->rq_status = obd_preprw(cmd, conn, objcount, tmp1, niocount, tmp2,
 251                                     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;
 263                 bulk = ptlrpc_prep_bulk_page(desc);
 264                 if (bulk == NULL)
 265                         GOTO(out_bulk, rc = -ENOMEM);
 266                 remote_nb = &(((struct niobuf_remote *)tmp2)[i]);
 267                 bulk->b_xid = remote_nb->xid;
 268                 bulk->b_buf = (void *)(unsigned long)local_nb[i].addr;
 269                 bulk->b_buflen = PAGE_SIZE;
 270         }
 271
 272         rc = ptlrpc_send_bulk(desc);
 273         if (rc)
 274                 GOTO(out_bulk, rc);
 275
 276         lwi = LWI_TIMEOUT(obd_timeout * HZ, ost_bulk_timeout, desc);
 277         rc = l_wait_event(desc->b_waitq, desc->b_flags & PTL_BULK_FL_SENT, &lwi);
 278         if (rc) {
 279                 LASSERT(rc == -ETIMEDOUT);
 280                 GOTO(out_bulk, rc);
 281         }
 282
 283         /* The unpackers move tmp1 and tmp2, so reset them before using */
 284         tmp1 = lustre_msg_buf(req->rq_reqmsg, 1);
 285         tmp2 = lustre_msg_buf(req->rq_reqmsg, 2);
 286         req->rq_status = obd_commitrw(cmd, conn, objcount, tmp1, niocount,
 287                                       local_nb, desc_priv);
 288
 289         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 290
 291 out_bulk:
 292         ptlrpc_free_bulk(desc);
 293 out_local:
 294         OBD_FREE(local_nb, sizeof(*local_nb) * niocount);
 295 out:
 296         if (rc)
 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->b_cb = NULL;
 363         desc->b_portal = OSC_BULK_PORTAL;
 364         desc->b_desc_private = desc_priv;
 365         memcpy(&(desc->b_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->b_xid = xid;              /* single xid for all pages */
 380
 381                 bulk->b_buf = lnb->addr;
 382                 bulk->b_page = lnb->page;
 383                 bulk->b_flags = lnb->flags;
 384                 bulk->b_dentry = lnb->dentry;
 385                 bulk->b_buflen = lnb->len;
 386                 bulk->b_cb = NULL;
 387
 388                 /* this advances remote_nb */
 389                 ost_pack_niobuf((void **)&remote_nb, lnb->offset, lnb->len, 0,
 390                                 bulk->b_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->b_waitq, desc->b_flags & PTL_BULK_FL_RCVD, &lwi);
 402         if (rc) {
 403                 if (rc != -ETIMEDOUT)
 404                         LBUG();
 405                 GOTO(fail_bulk, rc);
 406         }
 407
 408         rc = obd_commitrw(cmd, conn, objcount, tmp1, niocount, local_nb,
 409                           desc->b_desc_private);
 410         ptlrpc_free_bulk(desc);
 411         EXIT;
 412 out_free:
 413         OBD_FREE(local_nb, niocount * sizeof(*local_nb));
 414 out:
 415         if (!reply_sent) {
 416                 if (rc)
 417                         ptlrpc_error(req->rq_svc, req);
 418                 else
 419                         ptlrpc_reply(req->rq_svc, req);
 420         }
 421         return rc;
 422
 423 fail_bulk:
 424         ptlrpc_free_bulk(desc);
 425 fail_preprw:
 426         /* FIXME: how do we undo the preprw? */
 427         goto out_free;
 428 }
 429
 430 static int ost_handle(struct ptlrpc_request *req)
 431 {
 432         int rc;
 433         ENTRY;
 434
 435         rc = lustre_unpack_msg(req->rq_reqmsg, req->rq_reqlen);
 436         if (rc || OBD_FAIL_CHECK(OBD_FAIL_OST_HANDLE_UNPACK)) {
 437                 CERROR("lustre_ost: Invalid request\n");
 438                 GOTO(out, rc);
 439         }
 440
 441         if (req->rq_reqmsg->type != PTL_RPC_MSG_REQUEST) {
 442                 CERROR("lustre_ost: wrong packet type sent %d\n",
 443                        req->rq_reqmsg->type);
 444                 GOTO(out, rc = -EINVAL);
 445         }
 446
 447         if (req->rq_reqmsg->opc != OST_CONNECT &&
 448             req->rq_export == NULL) {
 449                 CERROR("lustre_ost: operation %d on unconnected OST\n",
 450                        req->rq_reqmsg->opc);
 451                 GOTO(out, rc = -ENOTCONN);
 452         }
 453
 454         if (strcmp(req->rq_obd->obd_type->typ_name, "ost") != 0)
 455                 GOTO(out, rc = -EINVAL);
 456
 457         switch (req->rq_reqmsg->opc) {
 458         case OST_CONNECT:
 459                 CDEBUG(D_INODE, "connect\n");
 460                 OBD_FAIL_RETURN(OBD_FAIL_OST_CONNECT_NET, 0);
 461                 rc = target_handle_connect(req);
 462                 break;
 463         case OST_DISCONNECT:
 464                 CDEBUG(D_INODE, "disconnect\n");
 465                 OBD_FAIL_RETURN(OBD_FAIL_OST_DISCONNECT_NET, 0);
 466                 rc = target_handle_disconnect(req);
 467                 break;
 468         case OST_CREATE:
 469                 CDEBUG(D_INODE, "create\n");
 470                 OBD_FAIL_RETURN(OBD_FAIL_OST_CREATE_NET, 0);
 471                 rc = ost_create(req);
 472                 break;
 473         case OST_DESTROY:
 474                 CDEBUG(D_INODE, "destroy\n");
 475                 OBD_FAIL_RETURN(OBD_FAIL_OST_DESTROY_NET, 0);
 476                 rc = ost_destroy(req);
 477                 break;
 478         case OST_GETATTR:
 479                 CDEBUG(D_INODE, "getattr\n");
 480                 OBD_FAIL_RETURN(OBD_FAIL_OST_GETATTR_NET, 0);
 481                 rc = ost_getattr(req);
 482                 break;
 483         case OST_SETATTR:
 484                 CDEBUG(D_INODE, "setattr\n");
 485                 OBD_FAIL_RETURN(OBD_FAIL_OST_SETATTR_NET, 0);
 486                 rc = ost_setattr(req);
 487                 break;
 488         case OST_OPEN:
 489                 CDEBUG(D_INODE, "open\n");
 490                 OBD_FAIL_RETURN(OBD_FAIL_OST_OPEN_NET, 0);
 491                 rc = ost_open(req);
 492                 break;
 493         case OST_CLOSE:
 494                 CDEBUG(D_INODE, "close\n");
 495                 OBD_FAIL_RETURN(OBD_FAIL_OST_CLOSE_NET, 0);
 496                 rc = ost_close(req);
 497                 break;
 498         case OST_WRITE:
 499                 CDEBUG(D_INODE, "write\n");
 500                 OBD_FAIL_RETURN(OBD_FAIL_OST_BRW_NET, 0);
 501                 rc = ost_brw_write(req);
 502                 /* ost_brw sends its own replies */
 503                 RETURN(rc);
 504         case OST_READ:
 505                 CDEBUG(D_INODE, "read\n");
 506                 OBD_FAIL_RETURN(OBD_FAIL_OST_BRW_NET, 0);
 507                 rc = ost_brw_read(req);
 508                 /* ost_brw sends its own replies */
 509                 RETURN(rc);
 510         case OST_PUNCH:
 511                 CDEBUG(D_INODE, "punch\n");
 512                 OBD_FAIL_RETURN(OBD_FAIL_OST_PUNCH_NET, 0);
 513                 rc = ost_punch(req);
 514                 break;
 515         case OST_STATFS:
 516                 CDEBUG(D_INODE, "statfs\n");
 517                 OBD_FAIL_RETURN(OBD_FAIL_OST_STATFS_NET, 0);
 518                 rc = ost_statfs(req);
 519                 break;
 520         case LDLM_ENQUEUE:
 521                 CDEBUG(D_INODE, "enqueue\n");
 522                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_ENQUEUE, 0);
 523                 rc = ldlm_handle_enqueue(req);
 524                 if (rc)
 525                         break;
 526                 RETURN(0);
 527         case LDLM_CONVERT:
 528                 CDEBUG(D_INODE, "convert\n");
 529                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CONVERT, 0);
 530                 rc = ldlm_handle_convert(req);
 531                 if (rc)
 532                         break;
 533                 RETURN(0);
 534         case LDLM_CANCEL:
 535                 CDEBUG(D_INODE, "cancel\n");
 536                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CANCEL, 0);
 537                 rc = ldlm_handle_cancel(req);
 538                 if (rc)
 539                         break;
 540                 RETURN(0);
 541         case LDLM_BL_CALLBACK:
 542         case LDLM_CP_CALLBACK:
 543                 CDEBUG(D_INODE, "callback\n");
 544                 CERROR("callbacks should not happen on OST\n");
 545                 LBUG();
 546                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_BL_CALLBACK, 0);
 547                 break;
 548         default:
 549                 req->rq_status = -ENOTSUPP;
 550                 rc = ptlrpc_error(req->rq_svc, req);
 551                 RETURN(rc);
 552         }
 553
 554         EXIT;
 555 out:
 556         //req->rq_status = rc;
 557         if (rc) {
 558                 CERROR("ost: processing error (opcode=%d): %d\n",
 559                        req->rq_reqmsg->opc, rc);
 560                 ptlrpc_error(req->rq_svc, req);
 561         } else {
 562                 CDEBUG(D_INODE, "sending reply\n");
 563                 if (req->rq_repmsg == NULL)
 564                         CERROR("handler for opcode %d returned rc=0 without "
 565                                "creating rq_repmsg; needs to return rc != "
 566                                "0!\n", req->rq_reqmsg->opc);
 567                 ptlrpc_reply(req->rq_svc, req);
 568         }
 569
 570         return 0;
 571 }
 572
 573 #define OST_NUM_THREADS 6
 574
 575 /* mount the file system (secretly) */
 576 static int ost_setup(struct obd_device *obddev, obd_count len, void *buf)
 577 {
 578         struct obd_ioctl_data* data = buf;
 579         struct ost_obd *ost = &obddev->u.ost;
 580         struct obd_device *tgt;
 581         int err;
 582         int i;
 583         ENTRY;
 584
 585         if (data->ioc_inllen1 < 1) {
 586                 CERROR("requires a TARGET OBD UUID\n");
 587                 RETURN(-EINVAL);
 588         }
 589         if (data->ioc_inllen1 > 37) {
 590                 CERROR("OBD UUID must be less than 38 characters\n");
 591                 RETURN(-EINVAL);
 592         }
 593
 594         MOD_INC_USE_COUNT;
 595         tgt = class_uuid2obd(data->ioc_inlbuf1);
 596         if (!tgt || !(tgt->obd_flags & OBD_ATTACHED) ||
 597             !(tgt->obd_flags & OBD_SET_UP)) {
 598                 CERROR("device not attached or not set up (%d)\n",
 599                        data->ioc_dev);
 600                 GOTO(error_dec, err = -EINVAL);
 601         }
 602
 603         err = obd_connect(&ost->ost_conn, tgt, NULL);
 604         if (err) {
 605                 CERROR("fail to connect to device %d\n", data->ioc_dev);
 606                 GOTO(error_dec, err = -EINVAL);
 607         }
 608
 609         ost->ost_service = ptlrpc_init_svc(64 * 1024, OST_REQUEST_PORTAL,
 610                                            OSC_REPLY_PORTAL, "self",ost_handle,
 611                                            "ost");
 612         if (!ost->ost_service) {
 613                 CERROR("failed to start service\n");
 614                 GOTO(error_disc, err = -EINVAL);
 615         }
 616
 617         for (i = 0; i < OST_NUM_THREADS; i++) {
 618                 char name[32];
 619                 sprintf(name, "lustre_ost_%02d", i);
 620                 err = ptlrpc_start_thread(obddev, ost->ost_service, name);
 621                 if (err) {
 622                         CERROR("error starting thread #%d: rc %d\n", i, err);
 623                         GOTO(error_disc, err = -EINVAL);
 624                 }
 625         }
 626
 627         RETURN(0);
 628
 629 error_disc:
 630         obd_disconnect(&ost->ost_conn);
 631 error_dec:
 632         MOD_DEC_USE_COUNT;
 633         RETURN(err);
 634 }
 635
 636 static int ost_cleanup(struct obd_device * obddev)
 637 {
 638         struct ost_obd *ost = &obddev->u.ost;
 639         int err;
 640
 641         ENTRY;
 642
 643         if ( !list_empty(&obddev->obd_exports) ) {
 644                 CERROR("still has clients!\n");
 645                 RETURN(-EBUSY);
 646         }
 647
 648         ptlrpc_stop_all_threads(ost->ost_service);
 649         ptlrpc_unregister_service(ost->ost_service);
 650
 651         err = obd_disconnect(&ost->ost_conn);
 652         if (err) {
 653                 CERROR("lustre ost: fail to disconnect device\n");
 654                 RETURN(-EINVAL);
 655         }
 656
 657         MOD_DEC_USE_COUNT;
 658         RETURN(0);
 659 }
 660
 661 /* use obd ops to offer management infrastructure */
 662 static struct obd_ops ost_obd_ops = {
 663         o_setup:       ost_setup,
 664         o_cleanup:     ost_cleanup,
 665 };
 666
 667 static int __init ost_init(void)
 668 {
 669         class_register_type(&ost_obd_ops, LUSTRE_OST_NAME);
 670         return 0;
 671 }
 672
 673 static void __exit ost_exit(void)
 674 {
 675         class_unregister_type(LUSTRE_OST_NAME);
 676 }
 677
 678 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 679 MODULE_DESCRIPTION("Lustre Object Storage Target (OST) v0.01");
 680 MODULE_LICENSE("GPL");
 681
 682 module_init(ost_init);
 683 module_exit(ost_exit);