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) 2001-2003 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/lustre_export.h>
  41 #include <linux/init.h>
  42 #include <linux/lprocfs_status.h>
  43
  44 inline void oti_init(struct obd_trans_info *oti,
  45                            struct ptlrpc_request *req)
  46 {
  47         if(oti == NULL)
  48                 return;
  49         memset(oti, 0, sizeof *oti);
  50
  51
  52         if (req->rq_repmsg && req->rq_reqmsg != 0)
  53                 oti->oti_transno = req->rq_repmsg->transno;
  54
  55         EXIT;
  56 }
  57
  58 inline void oti_to_request(struct obd_trans_info *oti,
  59                            struct ptlrpc_request *req)
  60 {
  61         int i;
  62         struct oti_req_ack_lock *ack_lock;
  63
  64         if(oti == NULL)
  65                 return;
  66
  67         if (req->rq_repmsg)
  68                 req->rq_repmsg->transno = oti->oti_transno;
  69
  70         /* XXX 4 == entries in oti_ack_locks??? */
  71         for (ack_lock = oti->oti_ack_locks, i = 0; i < 4; i++, ack_lock++) {
  72                 if (!ack_lock->mode)
  73                         break;
  74                 memcpy(&req->rq_ack_locks[i].lock, &ack_lock->lock,
  75                        sizeof(req->rq_ack_locks[i].lock));
  76                 req->rq_ack_locks[i].mode = ack_lock->mode;
  77         }
  78         EXIT;
  79 }
  80
  81 static int ost_destroy(struct ptlrpc_request *req, struct obd_trans_info *oti)
  82 {
  83         struct lustre_handle *conn = &req->rq_reqmsg->handle;
  84         struct ost_body *body;
  85         int rc, size = sizeof(*body);
  86         ENTRY;
  87
  88         body = lustre_swab_reqbuf (req, 0, sizeof (*body),
  89                                    lustre_swab_ost_body);
  90         if (body == NULL)
  91                 RETURN (-EFAULT);
  92
  93         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
  94         if (rc)
  95                 RETURN(rc);
  96
  97         req->rq_status = obd_destroy(conn, &body->oa, NULL, oti);
  98         RETURN(0);
  99 }
 100
 101 static int ost_getattr(struct ptlrpc_request *req)
 102 {
 103         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 104         struct ost_body *body, *repbody;
 105         int rc, size = sizeof(*body);
 106         ENTRY;
 107
 108         body = lustre_swab_reqbuf (req, 0, sizeof (*body),
 109                                    lustre_swab_ost_body);
 110         if (body == NULL)
 111                 RETURN (-EFAULT);
 112
 113         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 114         if (rc)
 115                 RETURN(rc);
 116
 117         repbody = lustre_msg_buf (req->rq_repmsg, 0, sizeof (*repbody));
 118         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 119         req->rq_status = obd_getattr(conn, &repbody->oa, NULL);
 120         RETURN(0);
 121 }
 122
 123 static int ost_statfs(struct ptlrpc_request *req)
 124 {
 125         struct obd_statfs *osfs;
 126         int rc, size = sizeof(*osfs);
 127         ENTRY;
 128
 129         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 130         if (rc)
 131                 RETURN(rc);
 132
 133         osfs = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*osfs));
 134         memset(osfs, 0, size);
 135
 136         req->rq_status = obd_statfs(req->rq_export, osfs);
 137         if (req->rq_status != 0)
 138                 CERROR("ost: statfs failed: rc %d\n", req->rq_status);
 139
 140         RETURN(0);
 141 }
 142
 143 static int ost_syncfs(struct ptlrpc_request *req)
 144 {
 145         struct obd_statfs *osfs;
 146         int rc, size = sizeof(*osfs);
 147         ENTRY;
 148
 149         rc = lustre_pack_msg(0, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 150         if (rc)
 151                 RETURN(rc);
 152
 153         rc = obd_syncfs(req->rq_export);
 154         if (rc) {
 155                 CERROR("ost: syncfs failed: rc %d\n", rc);
 156                 req->rq_status = rc;
 157                 RETURN(rc);
 158         }
 159
 160         RETURN(0);
 161 }
 162
 163 static int ost_open(struct ptlrpc_request *req, struct obd_trans_info *oti)
 164 {
 165         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 166         struct ost_body *body, *repbody;
 167         int rc, size = sizeof(*repbody);
 168         ENTRY;
 169
 170         body = lustre_swab_reqbuf (req, 0, sizeof (*body),
 171                                    lustre_swab_ost_body);
 172         if (body == NULL)
 173                 return (-EFAULT);
 174
 175         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 176         if (rc)
 177                 RETURN(rc);
 178
 179         repbody = lustre_msg_buf (req->rq_repmsg, 0, sizeof (*repbody));
 180         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 181         req->rq_status = obd_open(conn, &repbody->oa, NULL, oti, NULL);
 182         RETURN(0);
 183 }
 184
 185 static int ost_close(struct ptlrpc_request *req, struct obd_trans_info *oti)
 186 {
 187         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 188         struct ost_body *body, *repbody;
 189         int rc, size = sizeof(*repbody);
 190         ENTRY;
 191
 192         body = lustre_swab_reqbuf (req, 0, sizeof (*body),
 193                                    lustre_swab_ost_body);
 194         if (body == NULL)
 195                 RETURN (-EFAULT);
 196
 197         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 198         if (rc)
 199                 RETURN(rc);
 200
 201         repbody = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*repbody));
 202         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 203         req->rq_status = obd_close(conn, &repbody->oa, NULL, oti);
 204         RETURN(0);
 205 }
 206
 207 static int ost_create(struct ptlrpc_request *req, struct obd_trans_info *oti)
 208 {
 209         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 210         struct ost_body *body, *repbody;
 211         int rc, size = sizeof(*repbody);
 212         ENTRY;
 213
 214         body = lustre_swab_reqbuf (req, 0, sizeof (*body),
 215                                    lustre_swab_ost_body);
 216         if (body == NULL)
 217                 RETURN (-EFAULT);
 218
 219         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 220         if (rc)
 221                 RETURN(rc);
 222
 223         repbody = lustre_msg_buf (req->rq_repmsg, 0, sizeof (*repbody));
 224         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 225         req->rq_status = obd_create(conn, &repbody->oa, NULL, oti);
 226         RETURN(0);
 227 }
 228
 229 static int ost_punch(struct ptlrpc_request *req, struct obd_trans_info *oti)
 230 {
 231         struct lustre_handle *conn = (struct lustre_handle *)req->rq_reqmsg;
 232         struct ost_body *body, *repbody;
 233         int rc, size = sizeof(*repbody);
 234         ENTRY;
 235
 236         body = lustre_swab_reqbuf (req, 0, sizeof (*body),
 237                                    lustre_swab_ost_body);
 238         if (body == NULL)
 239                 RETURN (-EFAULT);
 240
 241         if ((body->oa.o_valid & (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS)) !=
 242             (OBD_MD_FLSIZE | OBD_MD_FLBLOCKS))
 243                 RETURN(-EINVAL);
 244
 245         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 246         if (rc)
 247                 RETURN(rc);
 248
 249         repbody = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*repbody));
 250         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 251         req->rq_status = obd_punch(conn, &repbody->oa, NULL, repbody->oa.o_size,
 252                                    repbody->oa.o_blocks, oti);
 253         RETURN(0);
 254 }
 255
 256 static int ost_setattr(struct ptlrpc_request *req, struct obd_trans_info *oti)
 257 {
 258         struct lustre_handle *conn = &req->rq_reqmsg->handle;
 259         struct ost_body *body, *repbody;
 260         int rc, size = sizeof(*repbody);
 261         ENTRY;
 262
 263         body = lustre_swab_reqbuf (req, 0, sizeof (*body),
 264                                    lustre_swab_ost_body);
 265         if (body == NULL)
 266                 RETURN (-EFAULT);
 267
 268         rc = lustre_pack_msg(1, &size, NULL, &req->rq_replen, &req->rq_repmsg);
 269         if (rc)
 270                 RETURN(rc);
 271
 272         repbody = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*repbody));
 273         memcpy(&repbody->oa, &body->oa, sizeof(body->oa));
 274
 275         req->rq_status = obd_setattr(conn, &repbody->oa, NULL, oti);
 276         RETURN(0);
 277 }
 278
 279 static int ost_bulk_timeout(void *data)
 280 {
 281         ENTRY;
 282         /* We don't fail the connection here, because having the export
 283          * killed makes the (vital) call to commitrw very sad.
 284          */
 285         RETURN(1);
 286 }
 287
 288 static int get_per_page_niobufs (struct obd_ioobj *ioo, int nioo,
 289                                  struct niobuf_remote *rnb, int nrnb,
 290                                  struct niobuf_remote **pp_rnbp)
 291 {
 292         /* Copy a remote niobuf, splitting it into page-sized chunks
 293          * and setting ioo[i].ioo_bufcnt accordingly */
 294         struct niobuf_remote *pp_rnb;
 295         int   i;
 296         int   j;
 297         int   page;
 298         int   rnbidx = 0;
 299         int   npages = 0;
 300
 301         /* first count and check the number of pages required */
 302         for (i = 0; i < nioo; i++)
 303                 for (j = 0; j < ioo->ioo_bufcnt; j++, rnbidx++) {
 304                         obd_off offset = rnb[rnbidx].offset;
 305                         obd_off p0 = offset >> PAGE_SHIFT;
 306                         obd_off pn = (offset + rnb[rnbidx].len - 1)>>PAGE_SHIFT;
 307
 308                         LASSERT (rnbidx < nrnb);
 309
 310                         npages += (pn + 1 - p0);
 311
 312                         if (rnb[rnbidx].len == 0) {
 313                                 CERROR("zero len BRW: obj %d objid "LPX64
 314                                        " buf %u\n", i, ioo[i].ioo_id, j);
 315                                 return (-EINVAL);
 316                         }
 317                         if (j > 0 &&
 318                             rnb[rnbidx].offset <= rnb[rnbidx-1].offset) {
 319                                 CERROR("unordered BRW: obj %d objid "LPX64
 320                                        " buf %u offset "LPX64" <= "LPX64"\n",
 321                                        i, ioo[i].ioo_id, j, rnb[rnbidx].offset,
 322                                        rnb[rnbidx].offset);
 323                                 return (-EINVAL);
 324                         }
 325                 }
 326
 327         LASSERT (rnbidx == nrnb);
 328
 329         if (npages == nrnb) {       /* all niobufs are for single pages */
 330                 *pp_rnbp = rnb;
 331                 return (npages);
 332         }
 333
 334         OBD_ALLOC (pp_rnb, sizeof (*pp_rnb) * npages);
 335         if (pp_rnb == NULL)
 336                 return (-ENOMEM);
 337
 338         /* now do the actual split */
 339         page = rnbidx = 0;
 340         for (i = 0; i < nioo; i++) {
 341                 int  obj_pages = 0;
 342
 343                 for (j = 0; j < ioo[i].ioo_bufcnt; j++, rnbidx++) {
 344                         obd_off off = rnb[rnbidx].offset;
 345                         int     nob = rnb[rnbidx].len;
 346
 347                         LASSERT (rnbidx < nrnb);
 348                         do {
 349                                 obd_off  poff = off & (PAGE_SIZE - 1);
 350                                 int      pnob = (poff + nob > PAGE_SIZE) ?
 351                                                 PAGE_SIZE - poff : nob;
 352
 353                                 LASSERT (page < npages);
 354                                 pp_rnb[page].len = pnob;
 355                                 pp_rnb[page].offset = off;
 356                                 pp_rnb[page].flags = rnb->flags;
 357
 358                                 CDEBUG (D_PAGE, "   obj %d id "LPX64
 359                                         "page %d(%d) "LPX64" for %d\n",
 360                                         i, ioo[i].ioo_id, obj_pages, page,
 361                                         pp_rnb[page].offset, pp_rnb[page].len);
 362                                 page++;
 363                                 obj_pages++;
 364
 365                                 off += pnob;
 366                                 nob -= pnob;
 367                         } while (nob > 0);
 368                         LASSERT (nob == 0);
 369                 }
 370                 ioo[i].ioo_bufcnt = obj_pages;
 371         }
 372         LASSERT (page == npages);
 373
 374         *pp_rnbp = pp_rnb;
 375         return (npages);
 376 }
 377
 378 static void free_per_page_niobufs (int npages, struct niobuf_remote *pp_rnb,
 379                                    struct niobuf_remote *rnb)
 380 {
 381         if (pp_rnb == rnb)                      /* didn't allocate above */
 382                 return;
 383
 384         OBD_FREE (pp_rnb, sizeof (*pp_rnb) * npages);
 385 }
 386
 387 #if CHECKSUM_BULK
 388 __u64 ost_checksum_bulk (struct ptlrpc_bulk_desc *desc)
 389 {
 390         __u64             cksum = 0;
 391         struct list_head *tmp;
 392         char             *ptr;
 393
 394         list_for_each (tmp, &desc->bd_page_list) {
 395                 struct ptlrpc_bulk_page *bp;
 396
 397                 bp = list_entry (tmp, struct ptlrpc_bulk_page, bp_link);
 398                 ptr = kmap (bp->bp_page);
 399                 ost_checksum (&cksum, ptr + bp->bp_pageoffset, bp->bp_buflen);
 400                 kunmap (bp->bp_page);
 401         }
 402 }
 403 #endif
 404
 405 static int ost_brw_read(struct ptlrpc_request *req)
 406 {
 407         struct ptlrpc_bulk_desc *desc;
 408         struct niobuf_remote    *remote_nb;
 409         struct niobuf_remote    *pp_rnb;
 410         struct niobuf_local     *local_nb;
 411         struct obd_ioobj        *ioo;
 412         struct ost_body         *body;
 413         struct l_wait_info       lwi;
 414         void                    *desc_priv = NULL;
 415         int                      size[1] = { sizeof(*body) };
 416         int                      comms_error = 0;
 417         int                      niocount;
 418         int                      npages;
 419         int                      nob = 0;
 420         int                      rc;
 421         int                      i;
 422         ENTRY;
 423
 424         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_READ_BULK))
 425                 GOTO(out, rc = -EIO);
 426
 427         body = lustre_swab_reqbuf(req, 0, sizeof(*body), lustre_swab_ost_body);
 428         if (body == NULL) {
 429                 CERROR ("Missing/short ost_body\n");
 430                 GOTO (out, rc = -EFAULT);
 431         }
 432
 433         ioo = lustre_swab_reqbuf (req, 1, sizeof (*ioo),
 434                                   lustre_swab_obd_ioobj);
 435         if (ioo == NULL) {
 436                 CERROR ("Missing/short ioobj\n");
 437                 GOTO (out, rc = -EFAULT);
 438         }
 439
 440         niocount = ioo->ioo_bufcnt;
 441         remote_nb = lustre_swab_reqbuf(req, 2, niocount * sizeof (*remote_nb),
 442                                        lustre_swab_niobuf_remote);
 443         if (remote_nb == NULL) {
 444                 CERROR ("Missing/short niobuf\n");
 445                 GOTO (out, rc = -EFAULT);
 446         }
 447         if (lustre_msg_swabbed (req->rq_reqmsg)) { /* swab remaining niobufs */
 448                 for (i = 1; i < niocount; i++)
 449                         lustre_swab_niobuf_remote (&remote_nb[i]);
 450         }
 451
 452         rc = lustre_pack_msg(1, size, NULL, &req->rq_replen, &req->rq_repmsg);
 453         if (rc)
 454                 GOTO(out, rc);
 455
 456         /* CAVEAT EMPTOR this sets ioo->ioo_bufcnt to # pages */
 457         npages = get_per_page_niobufs (ioo, 1, remote_nb, niocount, &pp_rnb);
 458         if (npages < 0)
 459                 GOTO(out, rc = npages);
 460
 461         OBD_ALLOC(local_nb, sizeof(*local_nb) * npages);
 462         if (local_nb == NULL)
 463                 GOTO(out_pp_rnb, rc = -ENOMEM);
 464
 465         desc = ptlrpc_prep_bulk_exp (req, BULK_PUT_SOURCE, OST_BULK_PORTAL);
 466         if (desc == NULL)
 467                 GOTO(out_local, rc = -ENOMEM);
 468
 469         rc = obd_preprw(OBD_BRW_READ, req->rq_export, NULL, 1, ioo, npages,
 470                         pp_rnb, local_nb, &desc_priv, NULL);
 471         if (rc != 0)
 472                 GOTO(out_bulk, rc);
 473
 474         nob = 0;
 475         for (i = 0; i < npages; i++) {
 476                 int page_rc = local_nb[i].rc;
 477
 478                 if (page_rc < 0) {              /* error */
 479                         rc = page_rc;
 480                         break;
 481                 }
 482
 483                 LASSERT (page_rc <= pp_rnb[i].len);
 484                 nob += page_rc;
 485                 if (page_rc != 0) {             /* some data! */
 486                         LASSERT (local_nb[i].page != NULL);
 487                         rc = ptlrpc_prep_bulk_page(desc, local_nb[i].page,
 488                                                    pp_rnb[i].offset& ~PAGE_MASK,
 489                                                    page_rc);
 490                         if (rc != 0)
 491                                 break;
 492                 }
 493
 494                 if (page_rc != pp_rnb[i].len) { /* short read */
 495                         /* All subsequent pages should be 0 */
 496                         while (++i < npages)
 497                                 LASSERT (local_nb[i].rc == 0);
 498                         break;
 499                 }
 500         }
 501
 502         if (rc == 0) {
 503                 rc = ptlrpc_bulk_put(desc);
 504                 if (rc == 0) {
 505                         lwi = LWI_TIMEOUT(obd_timeout * HZ, ost_bulk_timeout,
 506                                           desc);
 507                         rc = l_wait_event(desc->bd_waitq,
 508                                           ptlrpc_bulk_complete(desc), &lwi);
 509                         if (rc) {
 510                                 LASSERT(rc == -ETIMEDOUT);
 511                                 CERROR ("timeout waiting for bulk PUT\n");
 512                                 ptlrpc_abort_bulk (desc);
 513                         }
 514                 } else {
 515                         CERROR("ptlrpc_bulk_put failed RC: %d\n", rc);
 516                 }
 517                 comms_error = rc != 0;
 518         }
 519
 520         /* Must commit after prep above in all cases */
 521         rc = obd_commitrw(OBD_BRW_READ, req->rq_export, 1, ioo, npages,
 522                           local_nb, desc_priv, NULL);
 523
 524 #if CHECKSUM_BULK
 525         if (rc == 0) {
 526                 body = lustre_msg_buf(req->rq_repmsg, 0, sizeof (*body));
 527                 body->oa.o_rdev = ost_checksum_bulk (desc);
 528                 body->oa.o_valid |= OBD_MD_FLCKSUM;
 529         }
 530 #endif
 531
 532  out_bulk:
 533         ptlrpc_free_bulk (desc);
 534  out_local:
 535         OBD_FREE(local_nb, sizeof(*local_nb) * npages);
 536  out_pp_rnb:
 537         free_per_page_niobufs (npages, pp_rnb, remote_nb);
 538  out:
 539         LASSERT (rc <= 0);
 540         if (rc == 0) {
 541                 req->rq_status = nob;
 542                 ptlrpc_reply(req);
 543         } else if (!comms_error) {
 544                 /* only reply if comms OK */
 545                 req->rq_status = rc;
 546                 ptlrpc_error(req);
 547         } else {
 548                 if (req->rq_repmsg != NULL) {
 549                         /* reply out callback would free */
 550                         OBD_FREE (req->rq_repmsg, req->rq_replen);
 551                 }
 552                 CERROR("bulk IO comms error: evicting %s@%s nid "LPU64"\n",
 553                        req->rq_export->exp_client_uuid.uuid,
 554                        req->rq_connection->c_remote_uuid.uuid,
 555                        req->rq_connection->c_peer.peer_nid);
 556                 ptlrpc_fail_export(req->rq_export);
 557         }
 558
 559         RETURN(rc);
 560 }
 561
 562 static int ost_brw_write(struct ptlrpc_request *req, struct obd_trans_info *oti)
 563 {
 564         struct ptlrpc_bulk_desc *desc;
 565         struct niobuf_remote    *remote_nb;
 566         struct niobuf_remote    *pp_rnb;
 567         struct niobuf_local     *local_nb;
 568         struct obd_ioobj        *ioo;
 569         struct ost_body         *body;
 570         struct l_wait_info       lwi;
 571         void                    *desc_priv = NULL;
 572         __u32                   *rcs;
 573         int                      size[2] = { sizeof (*body) };
 574         int                      objcount, niocount, npages;
 575         int                      comms_error = 0;
 576         int                      rc, rc2, swab, i, j;
 577         ENTRY;
 578
 579         if (OBD_FAIL_CHECK(OBD_FAIL_OST_BRW_WRITE_BULK))
 580                 GOTO(out, rc = -EIO);
 581
 582         /* pause before transaction has been started */
 583         OBD_FAIL_TIMEOUT(OBD_FAIL_OST_BRW_PAUSE_BULK | OBD_FAIL_ONCE,
 584                          obd_timeout +1);
 585
 586         swab = lustre_msg_swabbed (req->rq_reqmsg);
 587         body = lustre_swab_reqbuf (req, 0, sizeof (*body),
 588                                    lustre_swab_ost_body);
 589         if (body == NULL) {
 590                 CERROR ("Missing/short ost_body\n");
 591                 GOTO(out, rc = -EFAULT);
 592         }
 593
 594         LASSERT_REQSWAB (req, 1);
 595         objcount = req->rq_reqmsg->buflens[1] / sizeof(*ioo);
 596         if (objcount == 0) {
 597                 CERROR ("Missing/short ioobj\n");
 598                 GOTO (out, rc = -EFAULT);
 599         }
 600         ioo = lustre_msg_buf (req->rq_reqmsg, 1, objcount * sizeof (*ioo));
 601         LASSERT (ioo != NULL);
 602         for (niocount = i = 0; i < objcount; i++) {
 603                 if (swab)
 604                         lustre_swab_obd_ioobj (&ioo[i]);
 605                 if (ioo[i].ioo_bufcnt == 0) {
 606                         CERROR ("ioo[%d] has zero bufcnt\n", i);
 607                         GOTO (out, rc = -EFAULT);
 608                 }
 609                 niocount += ioo[i].ioo_bufcnt;
 610         }
 611
 612         remote_nb = lustre_swab_reqbuf(req, 2, niocount * sizeof (*remote_nb),
 613                                        lustre_swab_niobuf_remote);
 614         if (remote_nb == NULL) {
 615                 CERROR ("Missing/short niobuf\n");
 616                 GOTO(out, rc = -EFAULT);
 617         }
 618         if (swab) {                             /* swab the remaining niobufs */
 619                 for (i = 1; i < niocount; i++)
 620                         lustre_swab_niobuf_remote (&remote_nb[i]);
 621         }
 622
 623         size[1] = niocount * sizeof (*rcs);
 624         rc = lustre_pack_msg(2, size, NULL, &req->rq_replen,
 625                              &req->rq_repmsg);
 626         if (rc != 0)
 627                 GOTO (out, rc);
 628         rcs = lustre_msg_buf (req->rq_repmsg, 1, niocount * sizeof (*rcs));
 629
 630         /* CAVEAT EMPTOR this sets ioo->ioo_bufcnt to # pages */
 631         npages = get_per_page_niobufs(ioo, objcount,remote_nb,niocount,&pp_rnb);
 632         if (npages < 0)
 633                 GOTO (out, rc = npages);
 634
 635         OBD_ALLOC(local_nb, sizeof(*local_nb) * npages);
 636         if (local_nb == NULL)
 637                 GOTO(out_pp_rnb, rc = -ENOMEM);
 638
 639         desc = ptlrpc_prep_bulk_exp (req, BULK_GET_SINK, OST_BULK_PORTAL);
 640         if (desc == NULL)
 641                 GOTO(out_local, rc = -ENOMEM);
 642
 643         rc = obd_preprw(OBD_BRW_WRITE, req->rq_export, NULL, objcount, ioo,
 644                         npages, pp_rnb, local_nb, &desc_priv, oti);
 645         if (rc != 0)
 646                 GOTO (out_bulk, rc);
 647
 648         /* NB Having prepped, we must commit... */
 649
 650         for (i = 0; i < npages; i++) {
 651                 rc = ptlrpc_prep_bulk_page(desc, local_nb[i].page,
 652                                            pp_rnb[i].offset & (PAGE_SIZE - 1),
 653                                            pp_rnb[i].len);
 654                 if (rc != 0)
 655                         break;
 656         }
 657
 658         if (rc == 0) {
 659                 rc = ptlrpc_bulk_get(desc);
 660                 if (rc == 0) {
 661                         lwi = LWI_TIMEOUT(obd_timeout * HZ, ost_bulk_timeout,
 662                                           desc);
 663                         rc = l_wait_event(desc->bd_waitq,
 664                                           ptlrpc_bulk_complete(desc), &lwi);
 665                         if (rc) {
 666                                 LASSERT(rc == -ETIMEDOUT);
 667                                 CERROR ("timeout waiting for bulk GET\n");
 668                                 ptlrpc_abort_bulk (desc);
 669                         }
 670                 } else {
 671                         CERROR("ptlrpc_bulk_get failed RC: %d\n", rc);
 672                 }
 673                 comms_error = rc != 0;
 674         }
 675
 676 #if CHECKSUM_BULK
 677         if (rc == 0 && (body->oa.o_valid & OBD_MD_FLCKSUM) != 0) {
 678                 static int cksum_counter;
 679                 __u64 client_cksum = body->oa.o_rdev;
 680                 __u64 cksum = ost_checksum_bulk (desc);
 681
 682                 if (client_cksum != cksum) {
 683                         CERROR("Bad checksum: client "LPX64", server "LPX64
 684                                ", client NID "LPX64"\n", client_cksum, cksum,
 685                                req->rq_connection->c_peer.peer_nid);
 686                         cksum_counter = 1;
 687                 } else {
 688                         cksum_counter++;
 689                         if ((cksum_counter & (-cksum_counter)) == cksum_counter)
 690                                 CERROR("Checksum %d from "LPX64": "LPX64" OK\n",
 691                                         cksum_counter,
 692                                         req->rq_connection->c_peer.peer_nid,
 693                                         cksum);
 694                 }
 695         }
 696 #endif
 697         /* Must commit after prep above in all cases */
 698         rc2 = obd_commitrw(OBD_BRW_WRITE, req->rq_export, objcount, ioo,
 699                            npages, local_nb, desc_priv, oti);
 700
 701         if (rc == 0) {
 702                 /* set per-requested niobuf return codes */
 703                 for (i = j = 0; i < niocount; i++) {
 704                         int nob = remote_nb[i].len;
 705
 706                         rcs[i] = 0;
 707                         do {
 708                                 LASSERT (j < npages);
 709                                 if (local_nb[j].rc < 0)
 710                                         rcs[i] = local_nb[j].rc;
 711                                 nob -= pp_rnb[j].len;
 712                                 j++;
 713                         } while (nob > 0);
 714                         LASSERT (nob == 0);
 715                 }
 716                 LASSERT (j == npages);
 717         }
 718         if (rc == 0)
 719                 rc = rc2;
 720
 721  out_bulk:
 722         ptlrpc_free_bulk (desc);
 723  out_local:
 724         OBD_FREE(local_nb, sizeof(*local_nb) * npages);
 725  out_pp_rnb:
 726         free_per_page_niobufs (npages, pp_rnb, remote_nb);
 727  out:
 728         if (rc == 0) {
 729                 oti_to_request(oti, req);
 730                 rc = ptlrpc_reply(req);
 731         } else if (!comms_error) {
 732                 /* Only reply if there was no comms problem with bulk */
 733                 req->rq_status = rc;
 734                 ptlrpc_error(req);
 735         } else {
 736                 if (req->rq_repmsg != NULL) {
 737                         /* reply out callback would free */
 738                         OBD_FREE (req->rq_repmsg, req->rq_replen);
 739                 }
 740                 CERROR("bulk IO comms error: evicting %s@%s nid "LPU64"\n",
 741                        req->rq_export->exp_client_uuid.uuid,
 742                        req->rq_connection->c_remote_uuid.uuid,
 743                        req->rq_connection->c_peer.peer_nid);
 744                 ptlrpc_fail_export(req->rq_export);
 745         }
 746         RETURN(rc);
 747 }
 748
 749 static int ost_san_brw(struct ptlrpc_request *req, int cmd)
 750 {
 751         struct lustre_handle *conn = &req->rq_reqmsg->handle;
 752         struct niobuf_remote *remote_nb, *res_nb;
 753         struct obd_ioobj *ioo;
 754         struct ost_body *body;
 755         int rc, i, j, objcount, niocount, size[2] = {sizeof(*body)};
 756         int n;
 757         int swab;
 758         ENTRY;
 759
 760         /* XXX not set to use latest protocol */
 761
 762         swab = lustre_msg_swabbed (req->rq_reqmsg);
 763         body = lustre_swab_reqbuf (req, 0, sizeof (*body),
 764                                    lustre_swab_ost_body);
 765         if (body == NULL) {
 766                 CERROR ("Missing/short ost_body\n");
 767                 GOTO (out, rc = -EFAULT);
 768         }
 769
 770         ioo = lustre_swab_reqbuf(req, 1, sizeof (*ioo),
 771                                  lustre_swab_obd_ioobj);
 772         if (ioo == NULL) {
 773                 CERROR ("Missing/short ioobj\n");
 774                 GOTO (out, rc = -EFAULT);
 775         }
 776         objcount = req->rq_reqmsg->buflens[1] / sizeof(*ioo);
 777         niocount = ioo[0].ioo_bufcnt;
 778         for (i = 1; i < objcount; i++) {
 779                 if (swab)
 780                         lustre_swab_obd_ioobj (&ioo[i]);
 781                 niocount += ioo[i].ioo_bufcnt;
 782         }
 783
 784         remote_nb = lustre_swab_reqbuf(req, 2, niocount * sizeof (*remote_nb),
 785                                        lustre_swab_niobuf_remote);
 786         if (remote_nb == NULL) {
 787                 CERROR ("Missing/short niobuf\n");
 788                 GOTO (out, rc = -EFAULT);
 789         }
 790         if (swab) {                             /* swab the remaining niobufs */
 791                 for (i = 1; i < niocount; i++)
 792                         lustre_swab_niobuf_remote (&remote_nb[i]);
 793         }
 794
 795         for (i = n = 0; i < objcount; i++) {
 796                 for (j = 0; j < ioo[i].ioo_bufcnt; j++, n++) {
 797                         if (remote_nb[n].len == 0) {
 798                                 CERROR("zero len BRW: objid "LPX64" buf %u\n",
 799                                        ioo[i].ioo_id, j);
 800                                 GOTO(out, rc = -EINVAL);
 801                         }
 802                         if (j && remote_nb[n].offset <= remote_nb[n-1].offset) {
 803                                 CERROR("unordered BRW: objid "LPX64
 804                                        " buf %u offset "LPX64" <= "LPX64"\n",
 805                                        ioo[i].ioo_id, j, remote_nb[n].offset,
 806                                        remote_nb[n-1].offset);
 807                                 GOTO(out, rc = -EINVAL);
 808                         }
 809                 }
 810         }
 811
 812         size[1] = niocount * sizeof(*remote_nb);
 813         rc = lustre_pack_msg(2, size, NULL, &req->rq_replen, &req->rq_repmsg);
 814         if (rc)
 815                 GOTO(out, rc);
 816
 817         req->rq_status = obd_san_preprw(cmd, conn, objcount, ioo,
 818                                         niocount, remote_nb);
 819
 820         if (req->rq_status)
 821                 GOTO (out, rc = 0);
 822
 823         res_nb = lustre_msg_buf(req->rq_repmsg, 1, size[1]);
 824         memcpy (res_nb, remote_nb, size[1]);
 825         rc = 0;
 826 out:
 827         if (rc) {
 828                 OBD_FREE(req->rq_repmsg, req->rq_replen);
 829                 req->rq_repmsg = NULL;
 830                 req->rq_status = rc;
 831                 ptlrpc_error(req);
 832         } else
 833                 ptlrpc_reply(req);
 834
 835         return rc;
 836 }
 837
 838 static int filter_recovery_request(struct ptlrpc_request *req,
 839                                    struct obd_device *obd, int *process)
 840 {
 841         switch (req->rq_reqmsg->opc) {
 842         case OST_CONNECT: /* This will never get here, but for completeness. */
 843         case OST_DISCONNECT:
 844                *process = 1;
 845                RETURN(0);
 846
 847         case OBD_PING:
 848         case OST_CLOSE:
 849         case OST_CREATE:
 850         case OST_DESTROY:
 851         case OST_OPEN:
 852         case OST_PUNCH:
 853         case OST_SETATTR:
 854         case OST_SYNCFS:
 855         case OST_WRITE:
 856         case LDLM_ENQUEUE:
 857                 *process = target_queue_recovery_request(req, obd);
 858                 RETURN(0);
 859
 860         default:
 861                 DEBUG_REQ(D_ERROR, req, "not permitted during recovery");
 862                 *process = 0;
 863                 /* XXX what should we set rq_status to here? */
 864                 req->rq_status = -EAGAIN;
 865                 RETURN(ptlrpc_error(req));
 866         }
 867 }
 868
 869
 870
 871 static int ost_handle(struct ptlrpc_request *req)
 872 {
 873         struct obd_trans_info trans_info = { 0, };
 874         struct obd_trans_info *oti = &trans_info;
 875         int should_process, fail = OBD_FAIL_OST_ALL_REPLY_NET, rc = 0;
 876         ENTRY;
 877
 878         /* XXX identical to MDS */
 879         if (req->rq_reqmsg->opc != OST_CONNECT) {
 880                 struct obd_device *obd;
 881                 int abort_recovery, recovering;
 882
 883                 if (req->rq_export == NULL) {
 884                         CERROR("lustre_ost: operation %d on unconnected OST\n",
 885                                req->rq_reqmsg->opc);
 886                         req->rq_status = -ENOTCONN;
 887                         GOTO(out, rc = -ENOTCONN);
 888                 }
 889
 890                 obd = req->rq_export->exp_obd;
 891
 892                 /* Check for aborted recovery. */
 893                 spin_lock_bh(&obd->obd_processing_task_lock);
 894                 abort_recovery = obd->obd_abort_recovery;
 895                 recovering = obd->obd_recovering;
 896                 spin_unlock_bh(&obd->obd_processing_task_lock);
 897                 if (abort_recovery) {
 898                         target_abort_recovery(obd);
 899                 } else if (recovering) {
 900                         rc = filter_recovery_request(req, obd, &should_process);
 901                         if (rc || !should_process)
 902                                 RETURN(rc);
 903                 }
 904         }
 905
 906         if (strcmp(req->rq_obd->obd_type->typ_name, "ost") != 0)
 907                 GOTO(out, rc = -EINVAL);
 908
 909         oti_init(oti, req);
 910
 911         switch (req->rq_reqmsg->opc) {
 912         case OST_CONNECT:
 913                 CDEBUG(D_INODE, "connect\n");
 914                 OBD_FAIL_RETURN(OBD_FAIL_OST_CONNECT_NET, 0);
 915                 rc = target_handle_connect(req, ost_handle);
 916                 break;
 917         case OST_DISCONNECT:
 918                 CDEBUG(D_INODE, "disconnect\n");
 919                 OBD_FAIL_RETURN(OBD_FAIL_OST_DISCONNECT_NET, 0);
 920                 rc = target_handle_disconnect(req);
 921                 break;
 922         case OST_CREATE:
 923                 CDEBUG(D_INODE, "create\n");
 924                 OBD_FAIL_RETURN(OBD_FAIL_OST_CREATE_NET, 0);
 925                 rc = ost_create(req, oti);
 926                 break;
 927         case OST_DESTROY:
 928                 CDEBUG(D_INODE, "destroy\n");
 929                 OBD_FAIL_RETURN(OBD_FAIL_OST_DESTROY_NET, 0);
 930                 rc = ost_destroy(req, oti);
 931                 break;
 932         case OST_GETATTR:
 933                 CDEBUG(D_INODE, "getattr\n");
 934                 OBD_FAIL_RETURN(OBD_FAIL_OST_GETATTR_NET, 0);
 935                 rc = ost_getattr(req);
 936                 break;
 937         case OST_SETATTR:
 938                 CDEBUG(D_INODE, "setattr\n");
 939                 OBD_FAIL_RETURN(OBD_FAIL_OST_SETATTR_NET, 0);
 940                 rc = ost_setattr(req, oti);
 941                 break;
 942         case OST_OPEN:
 943                 CDEBUG(D_INODE, "open\n");
 944                 OBD_FAIL_RETURN(OBD_FAIL_OST_OPEN_NET, 0);
 945                 rc = ost_open(req, oti);
 946                 break;
 947         case OST_CLOSE:
 948                 CDEBUG(D_INODE, "close\n");
 949                 OBD_FAIL_RETURN(OBD_FAIL_OST_CLOSE_NET, 0);
 950                 rc = ost_close(req, oti);
 951                 break;
 952         case OST_WRITE:
 953                 CDEBUG(D_INODE, "write\n");
 954                 OBD_FAIL_RETURN(OBD_FAIL_OST_BRW_NET, 0);
 955                 rc = ost_brw_write(req, oti);
 956                 /* ost_brw sends its own replies */
 957                 RETURN(rc);
 958         case OST_READ:
 959                 CDEBUG(D_INODE, "read\n");
 960                 OBD_FAIL_RETURN(OBD_FAIL_OST_BRW_NET, 0);
 961                 rc = ost_brw_read(req);
 962                 /* ost_brw sends its own replies */
 963                 RETURN(rc);
 964         case OST_SAN_READ:
 965                 CDEBUG(D_INODE, "san read\n");
 966                 OBD_FAIL_RETURN(OBD_FAIL_OST_BRW_NET, 0);
 967                 rc = ost_san_brw(req, OBD_BRW_READ);
 968                 /* ost_san_brw sends its own replies */
 969                 RETURN(rc);
 970         case OST_SAN_WRITE:
 971                 CDEBUG(D_INODE, "san write\n");
 972                 OBD_FAIL_RETURN(OBD_FAIL_OST_BRW_NET, 0);
 973                 rc = ost_san_brw(req, OBD_BRW_WRITE);
 974                 /* ost_san_brw sends its own replies */
 975                 RETURN(rc);
 976         case OST_PUNCH:
 977                 CDEBUG(D_INODE, "punch\n");
 978                 OBD_FAIL_RETURN(OBD_FAIL_OST_PUNCH_NET, 0);
 979                 rc = ost_punch(req, oti);
 980                 break;
 981         case OST_STATFS:
 982                 CDEBUG(D_INODE, "statfs\n");
 983                 OBD_FAIL_RETURN(OBD_FAIL_OST_STATFS_NET, 0);
 984                 rc = ost_statfs(req);
 985                 break;
 986         case OST_SYNCFS:
 987                 CDEBUG(D_INODE, "sync\n");
 988                 OBD_FAIL_RETURN(OBD_FAIL_OST_SYNCFS_NET, 0);
 989                 rc = ost_syncfs(req);
 990                 break;
 991         case OBD_PING:
 992                 DEBUG_REQ(D_INODE, req, "ping");
 993                 rc = target_handle_ping(req);
 994                 break;
 995         case LDLM_ENQUEUE:
 996                 CDEBUG(D_INODE, "enqueue\n");
 997                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_ENQUEUE, 0);
 998                 rc = ldlm_handle_enqueue(req, ldlm_server_completion_ast,
 999                                          ldlm_server_blocking_ast);
1000                 fail = OBD_FAIL_OST_LDLM_REPLY_NET;
1001                 break;
1002         case LDLM_CONVERT:
1003                 CDEBUG(D_INODE, "convert\n");
1004                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CONVERT, 0);
1005                 rc = ldlm_handle_convert(req);
1006                 break;
1007         case LDLM_CANCEL:
1008                 CDEBUG(D_INODE, "cancel\n");
1009                 OBD_FAIL_RETURN(OBD_FAIL_LDLM_CANCEL, 0);
1010                 rc = ldlm_handle_cancel(req);
1011                 break;
1012         case LDLM_BL_CALLBACK:
1013         case LDLM_CP_CALLBACK:
1014                 CDEBUG(D_INODE, "callback\n");
1015                 CERROR("callbacks should not happen on OST\n");
1016                 /* fall through */
1017         default:
1018                 CERROR("Unexpected opcode %d\n", req->rq_reqmsg->opc);
1019                 req->rq_status = -ENOTSUPP;
1020                 rc = ptlrpc_error(req);
1021                 RETURN(rc);
1022         }
1023
1024         EXIT;
1025         /* If we're DISCONNECTing, the export_data is already freed */
1026         if (!rc && req->rq_reqmsg->opc != OST_DISCONNECT) {
1027                 struct obd_device *obd  = req->rq_export->exp_obd;
1028                 if (!obd->obd_no_transno) {
1029                         req->rq_repmsg->last_committed =
1030                                 obd->obd_last_committed;
1031                 } else {
1032                         DEBUG_REQ(D_IOCTL, req,
1033                                   "not sending last_committed update");
1034                 }
1035                 CDEBUG(D_INFO, "last_committed "LPU64", xid "LPX64"\n",
1036                        obd->obd_last_committed, req->rq_xid);
1037         }
1038
1039 out:
1040         if (lustre_msg_get_flags(req->rq_reqmsg) & MSG_LAST_REPLAY) {
1041                 struct obd_device *obd = req->rq_export->exp_obd;
1042
1043                 if (obd && obd->obd_recovering) {
1044                         DEBUG_REQ(D_HA, req, "LAST_REPLAY, queuing reply");
1045                         return target_queue_final_reply(req, rc);
1046                 }
1047                 /* Lost a race with recovery; let the error path DTRT. */
1048                 rc = req->rq_status = -ENOTCONN;
1049         }
1050
1051         if (!rc)
1052                 oti_to_request(oti, req);
1053
1054         target_send_reply(req, rc, fail);
1055         return 0;
1056 }
1057
1058 static int ost_setup(struct obd_device *obddev, obd_count len, void *buf)
1059 {
1060         struct ost_obd *ost = &obddev->u.ost;
1061         int err;
1062         int i;
1063         ENTRY;
1064
1065         ost->ost_service = ptlrpc_init_svc(OST_NEVENTS, OST_NBUFS,
1066                                            OST_BUFSIZE, OST_MAXREQSIZE,
1067                                            OST_REQUEST_PORTAL, OSC_REPLY_PORTAL,
1068                                            ost_handle, "ost", obddev);
1069         if (!ost->ost_service) {
1070                 CERROR("failed to start service\n");
1071                 GOTO(error_disc, err = -ENOMEM);
1072         }
1073
1074         for (i = 0; i < OST_NUM_THREADS; i++) {
1075                 char name[32];
1076                 sprintf(name, "ll_ost_%02d", i);
1077                 err = ptlrpc_start_thread(obddev, ost->ost_service, name);
1078                 if (err) {
1079                         CERROR("error starting thread #%d: rc %d\n", i, err);
1080                         GOTO(error_disc, err = -EINVAL);
1081                 }
1082         }
1083
1084         RETURN(0);
1085
1086 error_disc:
1087         RETURN(err);
1088 }
1089
1090 static int ost_cleanup(struct obd_device *obddev, int force, int failover)
1091 {
1092         struct ost_obd *ost = &obddev->u.ost;
1093         int err = 0;
1094         ENTRY;
1095
1096         if (obddev->obd_recovering)
1097                 target_cancel_recovery_timer(obddev);
1098
1099         ptlrpc_stop_all_threads(ost->ost_service);
1100         ptlrpc_unregister_service(ost->ost_service);
1101
1102         RETURN(err);
1103 }
1104
1105 int ost_attach(struct obd_device *dev, obd_count len, void *data)
1106 {
1107         struct lprocfs_static_vars lvars;
1108
1109         lprocfs_init_vars(&lvars);
1110         return lprocfs_obd_attach(dev, lvars.obd_vars);
1111 }
1112
1113 int ost_detach(struct obd_device *dev)
1114 {
1115         return lprocfs_obd_detach(dev);
1116 }
1117
1118 /* I don't think this function is ever used, since nothing
1119  * connects directly to this module.
1120  */
1121 static int ost_connect(struct lustre_handle *conn,
1122                        struct obd_device *obd, struct obd_uuid *cluuid)
1123 {
1124         struct obd_export *exp;
1125         int rc;
1126         ENTRY;
1127
1128         if (!conn || !obd || !cluuid)
1129                 RETURN(-EINVAL);
1130
1131         rc = class_connect(conn, obd, cluuid);
1132         if (rc)
1133                 RETURN(rc);
1134         exp = class_conn2export(conn);
1135         LASSERT(exp);
1136         class_export_put(exp);
1137
1138         RETURN(0);
1139 }
1140
1141 /* use obd ops to offer management infrastructure */
1142 static struct obd_ops ost_obd_ops = {
1143         o_owner:        THIS_MODULE,
1144         o_attach:       ost_attach,
1145         o_detach:       ost_detach,
1146         o_setup:        ost_setup,
1147         o_cleanup:      ost_cleanup,
1148         o_connect:      ost_connect,
1149 };
1150
1151 static int __init ost_init(void)
1152 {
1153         struct lprocfs_static_vars lvars;
1154         ENTRY;
1155
1156         lprocfs_init_vars(&lvars);
1157         RETURN(class_register_type(&ost_obd_ops, lvars.module_vars,
1158                                    LUSTRE_OST_NAME));
1159 }
1160
1161 static void __exit ost_exit(void)
1162 {
1163         class_unregister_type(LUSTRE_OST_NAME);
1164 }
1165
1166 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1167 MODULE_DESCRIPTION("Lustre Object Storage Target (OST) v0.01");
1168 MODULE_LICENSE("GPL");
1169
1170 module_init(ost_init);
1171 module_exit(ost_exit);