lustre/osc/osc_request.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  *
   6  *  This code is issued under the GNU General Public License.
   7  *  See the file COPYING in this distribution
   8  *
   9  *  Author Peter Braam <braam@clusterfs.com>
  10  *
  11  *  This server is single threaded at present (but can easily be multi
  12  *  threaded). For testing and management it is treated as an
  13  *  obd_device, although it does not export a full OBD method table
  14  *  (the requests are coming in over the wire, so object target
  15  *  modules do not have a full method table.)
  16  *
  17  */
  18
  19 #define EXPORT_SYMTAB
  20 #define DEBUG_SUBSYSTEM S_OSC
  21
  22 #include <linux/module.h>
  23 #include <linux/lustre_dlm.h>
  24 #include <linux/lustre_mds.h> /* for mds_objid */
  25 #include <linux/obd_ost.h>
  26 #include <linux/obd_lov.h>
  27
  28 static void osc_con2cl(struct lustre_handle *conn, struct ptlrpc_client **cl,
  29                        struct ptlrpc_connection **connection,
  30                        struct lustre_handle **rconn)
  31 {
  32         struct obd_export *export = class_conn2export(conn);
  33         struct osc_obd *osc = &export->exp_obd->u.osc;
  34
  35         *cl = osc->osc_client;
  36         *connection = osc->osc_conn;
  37         *rconn = &export->exp_rconnh;
  38 }
  39
  40 static void osc_con2dlmcl(struct lustre_handle *conn, struct ptlrpc_client **cl,
  41                           struct ptlrpc_connection **connection,
  42                           struct lustre_handle **rconn)
  43 {
  44         struct obd_export *export = class_conn2export(conn);
  45         struct osc_obd *osc = &export->exp_obd->u.osc;
  46
  47         *cl = osc->osc_ldlm_client;
  48         *connection = osc->osc_conn;
  49         *rconn = &export->exp_rconnh;
  50 }
  51
  52 static int osc_connect(struct lustre_handle *conn, struct obd_device *obd)
  53 {
  54         struct osc_obd *osc = &obd->u.osc;
  55         //struct obd_import *import;
  56         struct ptlrpc_request *request;
  57         char *tmp = osc->osc_target_uuid;
  58         int rc, size = sizeof(osc->osc_target_uuid);
  59         ENTRY;
  60
  61         /* not used yet
  62         OBD_ALLOC(import, sizeof(*import));
  63         if (!import)
  64                 RETURN(-ENOMEM);
  65          */
  66
  67         MOD_INC_USE_COUNT;
  68         rc = class_connect(conn, obd);
  69         if (rc)
  70                 RETURN(rc);
  71
  72         request = ptlrpc_prep_req(osc->osc_client, osc->osc_conn,
  73                                   OST_CONNECT, 1, &size, &tmp);
  74         if (!request)
  75                 GOTO(out_disco, rc = -ENOMEM);
  76
  77         request->rq_level = LUSTRE_CONN_NEW;
  78         request->rq_replen = lustre_msg_size(0, NULL);
  79         request->rq_reqmsg->addr = -1;
  80         /* Sending our local connection info breaks for local connections
  81         request->rq_reqmsg->addr = conn->addr;
  82         request->rq_reqmsg->cookie = conn->cookie;
  83          */
  84
  85         rc = ptlrpc_queue_wait(request);
  86         rc = ptlrpc_check_status(request, rc);
  87         if (rc) {
  88                 CERROR("%s failed: rc = %d\n", __FUNCTION__, rc);
  89                 GOTO(out, rc);
  90         }
  91
  92         /* XXX eventually maybe more refinement */
  93         osc->osc_conn->c_level = LUSTRE_CONN_FULL;
  94
  95         class_rconn2export(conn, (struct lustre_handle *)request->rq_repmsg);
  96
  97         EXIT;
  98  out:
  99         ptlrpc_free_req(request);
 100  out_disco:
 101         if (rc) {
 102                 class_disconnect(conn);
 103                 MOD_DEC_USE_COUNT;
 104         }
 105         return rc;
 106 }
 107
 108 static int osc_disconnect(struct lustre_handle *conn)
 109 {
 110         struct ptlrpc_request *request;
 111         struct ptlrpc_client *cl;
 112         struct ptlrpc_connection *connection;
 113         struct lustre_handle *rconn;
 114         int rc;
 115         ENTRY;
 116
 117         osc_con2cl(conn, &cl, &connection, &rconn);
 118         request = ptlrpc_prep_req2(cl, connection, rconn,
 119                                    OST_DISCONNECT, 0, NULL, NULL);
 120         if (!request)
 121                 RETURN(-ENOMEM);
 122         request->rq_replen = lustre_msg_size(0, NULL);
 123
 124         rc = ptlrpc_queue_wait(request);
 125         if (rc)
 126                 GOTO(out, rc);
 127         rc = class_disconnect(conn);
 128         if (!rc)
 129                 MOD_DEC_USE_COUNT;
 130
 131  out:
 132         ptlrpc_free_req(request);
 133         return rc;
 134 }
 135
 136 static int osc_getattr(struct lustre_handle *conn, struct obdo *oa)
 137 {
 138         struct ptlrpc_request *request;
 139         struct ptlrpc_client *cl;
 140         struct ptlrpc_connection *connection;
 141         struct lustre_handle *rconn;
 142         struct ost_body *body;
 143         int rc, size = sizeof(*body);
 144         ENTRY;
 145
 146         osc_con2cl(conn, &cl, &connection, &rconn);
 147         request = ptlrpc_prep_req2(cl, connection, rconn,
 148                                    OST_GETATTR, 1, &size, NULL);
 149         if (!request)
 150                 RETURN(-ENOMEM);
 151
 152         body = lustre_msg_buf(request->rq_reqmsg, 0);
 153         memcpy(&body->oa, oa, sizeof(*oa));
 154         body->oa.o_valid = ~0;
 155
 156         request->rq_replen = lustre_msg_size(1, &size);
 157
 158         rc = ptlrpc_queue_wait(request);
 159         rc = ptlrpc_check_status(request, rc);
 160         if (rc) {
 161                 CERROR("%s failed: rc = %d\n", __FUNCTION__, rc);
 162                 GOTO(out, rc);
 163         }
 164
 165         body = lustre_msg_buf(request->rq_repmsg, 0);
 166         CDEBUG(D_INODE, "mode: %o\n", body->oa.o_mode);
 167         if (oa)
 168                 memcpy(oa, &body->oa, sizeof(*oa));
 169
 170         EXIT;
 171  out:
 172         ptlrpc_free_req(request);
 173         return rc;
 174 }
 175
 176 static int osc_open(struct lustre_handle *conn, struct obdo *oa,
 177                     struct lov_stripe_md *md)
 178 {
 179         struct ptlrpc_request *request;
 180         struct ptlrpc_client *cl;
 181         struct ptlrpc_connection *connection;
 182         struct lustre_handle *rconn;
 183         struct ost_body *body;
 184         int rc, size = sizeof(*body);
 185         ENTRY;
 186
 187         osc_con2cl(conn, &cl, &connection, &rconn);
 188         request = ptlrpc_prep_req2(cl, connection, rconn,
 189                                    OST_OPEN, 1, &size, NULL);
 190         if (!request)
 191                 RETURN(-ENOMEM);
 192
 193         body = lustre_msg_buf(request->rq_reqmsg, 0);
 194         memcpy(&body->oa, oa, sizeof(*oa));
 195         body->oa.o_valid = (OBD_MD_FLMODE | OBD_MD_FLID);
 196
 197         request->rq_replen = lustre_msg_size(1, &size);
 198
 199         rc = ptlrpc_queue_wait(request);
 200         rc = ptlrpc_check_status(request, rc);
 201         if (rc)
 202                 GOTO(out, rc);
 203
 204         body = lustre_msg_buf(request->rq_repmsg, 0);
 205         CDEBUG(D_INODE, "mode: %o\n", body->oa.o_mode);
 206         if (oa)
 207                 memcpy(oa, &body->oa, sizeof(*oa));
 208
 209         EXIT;
 210  out:
 211         ptlrpc_free_req(request);
 212         return rc;
 213 }
 214
 215 static int osc_close(struct lustre_handle *conn, struct obdo *oa,
 216                      struct lov_stripe_md *md)
 217 {
 218         struct ptlrpc_request *request;
 219         struct ptlrpc_client *cl;
 220         struct ptlrpc_connection *connection;
 221         struct lustre_handle *rconn;
 222         struct ost_body *body;
 223         int rc, size = sizeof(*body);
 224         ENTRY;
 225
 226         osc_con2cl(conn, &cl, &connection, &rconn);
 227         request = ptlrpc_prep_req2(cl, connection, rconn,
 228                                    OST_CLOSE, 1, &size, NULL);
 229         if (!request)
 230                 RETURN(-ENOMEM);
 231
 232         oa->o_id = md->lmd_object_id;
 233         oa->o_mode = S_IFREG;
 234         oa->o_valid = (OBD_MD_FLMODE | OBD_MD_FLID);
 235         body = lustre_msg_buf(request->rq_reqmsg, 0);
 236         memcpy(&body->oa, oa, sizeof(*oa));
 237
 238         request->rq_replen = lustre_msg_size(1, &size);
 239
 240         rc = ptlrpc_queue_wait(request);
 241         rc = ptlrpc_check_status(request, rc);
 242         if (rc)
 243                 GOTO(out, rc);
 244
 245         body = lustre_msg_buf(request->rq_repmsg, 0);
 246         CDEBUG(D_INODE, "mode: %o\n", body->oa.o_mode);
 247         if (oa)
 248                 memcpy(oa, &body->oa, sizeof(*oa));
 249
 250         EXIT;
 251  out:
 252         ptlrpc_free_req(request);
 253         return rc;
 254 }
 255
 256 static int osc_setattr(struct lustre_handle *conn, struct obdo *oa)
 257 {
 258         struct ptlrpc_request *request;
 259         struct ptlrpc_client *cl;
 260         struct ptlrpc_connection *connection;
 261         struct lustre_handle *rconn;
 262         struct ost_body *body;
 263         int rc, size = sizeof(*body);
 264         ENTRY;
 265
 266         osc_con2cl(conn, &cl, &connection, &rconn);
 267         request = ptlrpc_prep_req2(cl, connection, rconn,
 268                                   OST_SETATTR, 1, &size, NULL);
 269         if (!request)
 270                 RETURN(-ENOMEM);
 271
 272         body = lustre_msg_buf(request->rq_reqmsg, 0);
 273         memcpy(&body->oa, oa, sizeof(*oa));
 274
 275         request->rq_replen = lustre_msg_size(1, &size);
 276
 277         rc = ptlrpc_queue_wait(request);
 278         rc = ptlrpc_check_status(request, rc);
 279         GOTO(out, rc);
 280
 281  out:
 282         ptlrpc_free_req(request);
 283         return rc;
 284 }
 285
 286 static int osc_create(struct lustre_handle *conn, struct obdo *oa,
 287                       struct lov_stripe_md **ea)
 288 {
 289         struct ptlrpc_request *request;
 290         struct ptlrpc_client *cl;
 291         struct ptlrpc_connection *connection;
 292         struct lustre_handle *rconn;
 293         struct ost_body *body;
 294         int rc, size = sizeof(*body);
 295         ENTRY;
 296
 297         if (!oa) {
 298                 CERROR("oa NULL\n");
 299                 RETURN(-EINVAL);
 300         }
 301
 302         if (!ea) {
 303                 LBUG();
 304         }
 305
 306         if (!*ea) {
 307                 OBD_ALLOC(*ea, oa->o_easize);
 308                 if (!*ea)
 309                         RETURN(-ENOMEM);
 310                 (*ea)->lmd_size = oa->o_easize;
 311         }
 312
 313         osc_con2cl(conn, &cl, &connection, &rconn);
 314         request = ptlrpc_prep_req2(cl, connection, rconn,
 315                                   OST_CREATE, 1, &size, NULL);
 316         if (!request)
 317                 RETURN(-ENOMEM);
 318
 319         body = lustre_msg_buf(request->rq_reqmsg, 0);
 320         memcpy(&body->oa, oa, sizeof(*oa));
 321
 322         request->rq_replen = lustre_msg_size(1, &size);
 323
 324         rc = ptlrpc_queue_wait(request);
 325         rc = ptlrpc_check_status(request, rc);
 326         if (rc)
 327                 GOTO(out, rc);
 328
 329         body = lustre_msg_buf(request->rq_repmsg, 0);
 330         memcpy(oa, &body->oa, sizeof(*oa));
 331
 332         (*ea)->lmd_object_id = oa->o_id;
 333         (*ea)->lmd_stripe_count = 1;
 334         EXIT;
 335  out:
 336         ptlrpc_free_req(request);
 337         return rc;
 338 }
 339
 340 static int osc_punch(struct lustre_handle *conn, struct obdo *oa,
 341                      struct lov_stripe_md *md, obd_size count,
 342                      obd_off offset)
 343 {
 344         struct ptlrpc_request *request;
 345         struct ptlrpc_client *cl;
 346         struct ptlrpc_connection *connection;
 347         struct lustre_handle *rconn;
 348         struct ost_body *body;
 349         int rc, size = sizeof(*body);
 350         ENTRY;
 351
 352         if (!oa) {
 353                 CERROR("oa NULL\n");
 354                 RETURN(-EINVAL);
 355         }
 356         osc_con2cl(conn, &cl, &connection, &rconn);
 357         request = ptlrpc_prep_req2(cl, connection, rconn,
 358                                    OST_PUNCH, 1, &size, NULL);
 359         if (!request)
 360                 RETURN(-ENOMEM);
 361
 362         body = lustre_msg_buf(request->rq_reqmsg, 0);
 363         memcpy(&body->oa, oa, sizeof(*oa));
 364         body->oa.o_blocks = count;
 365         body->oa.o_valid |= OBD_MD_FLBLOCKS;
 366
 367         request->rq_replen = lustre_msg_size(1, &size);
 368
 369         rc = ptlrpc_queue_wait(request);
 370         rc = ptlrpc_check_status(request, rc);
 371         if (rc)
 372                 GOTO(out, rc);
 373
 374         body = lustre_msg_buf(request->rq_repmsg, 0);
 375         memcpy(oa, &body->oa, sizeof(*oa));
 376
 377         EXIT;
 378  out:
 379         ptlrpc_free_req(request);
 380         return rc;
 381 }
 382
 383 static int osc_destroy(struct lustre_handle *conn, struct obdo *oa,
 384                        struct lov_stripe_md *ea)
 385 {
 386         struct ptlrpc_request *request;
 387         struct ptlrpc_client *cl;
 388         struct ptlrpc_connection *connection;
 389         struct lustre_handle *rconn;
 390         struct ost_body *body;
 391         int rc, size = sizeof(*body);
 392         ENTRY;
 393
 394         if (!oa) {
 395                 CERROR("oa NULL\n");
 396                 RETURN(-EINVAL);
 397         }
 398         osc_con2cl(conn, &cl, &connection, &rconn);
 399         request = ptlrpc_prep_req2(cl, connection, rconn,
 400                                    OST_DESTROY, 1, &size, NULL);
 401         if (!request)
 402                 RETURN(-ENOMEM);
 403
 404         body = lustre_msg_buf(request->rq_reqmsg, 0);
 405         memcpy(&body->oa, oa, sizeof(*oa));
 406         body->oa.o_valid = ~0;
 407
 408         request->rq_replen = lustre_msg_size(1, &size);
 409
 410         rc = ptlrpc_queue_wait(request);
 411         rc = ptlrpc_check_status(request, rc);
 412         if (rc)
 413                 GOTO(out, rc);
 414
 415         body = lustre_msg_buf(request->rq_repmsg, 0);
 416         memcpy(oa, &body->oa, sizeof(*oa));
 417
 418         EXIT;
 419  out:
 420         ptlrpc_free_req(request);
 421         return rc;
 422 }
 423
 424 struct osc_brw_cb_data {
 425         bulk_callback_t callback;
 426         void *cb_data;
 427         void *obd_data;
 428         size_t obd_size;
 429 };
 430
 431 static void brw_finish(struct ptlrpc_bulk_desc *desc, void *data)
 432 {
 433         struct list_head *tmp, *next;
 434         struct osc_brw_cb_data *cb_data = data;
 435         ENTRY;
 436
 437         if (desc->b_flags & PTL_RPC_FL_INTR)
 438                 CERROR("got signal\n");
 439
 440         /* This feels wrong to me. */
 441         list_for_each_safe(tmp, next, &desc->b_page_list) {
 442                 struct ptlrpc_bulk_page *bulk;
 443                 bulk = list_entry(tmp, struct ptlrpc_bulk_page, b_link);
 444
 445                 kunmap(bulk->b_page);
 446         }
 447
 448         if (cb_data->callback)
 449                 (cb_data->callback)(desc, cb_data->cb_data);
 450
 451         ptlrpc_bulk_decref(desc);
 452         if (cb_data->obd_data)
 453                 OBD_FREE(cb_data->obd_data, cb_data->obd_size);
 454         OBD_FREE(cb_data, sizeof(*cb_data));
 455         EXIT;
 456 }
 457
 458 static int osc_brw_read(struct lustre_handle *conn, struct lov_stripe_md *md,
 459                         obd_count page_count, struct page **page_array,
 460                         obd_size *count, obd_off *offset, obd_flag *flags,
 461                         bulk_callback_t callback)
 462 {
 463         struct ptlrpc_client *cl;
 464         struct ptlrpc_connection *connection;
 465         struct lustre_handle *rconn;
 466         struct ptlrpc_request *request = NULL;
 467         struct ptlrpc_bulk_desc *desc = NULL;
 468         struct ost_body *body;
 469         int rc, j, size[3] = {sizeof(*body)};
 470         void *iooptr, *nioptr;
 471         struct osc_brw_cb_data *cb_data = NULL;
 472         ENTRY;
 473
 474         size[1] = sizeof(struct obd_ioobj);
 475         size[2] = page_count * sizeof(struct niobuf_remote);
 476
 477         osc_con2cl(conn, &cl, &connection, &rconn);
 478         request = ptlrpc_prep_req2(cl, connection, rconn,
 479                                    OST_BRW, 3, size, NULL);
 480         if (!request)
 481                 RETURN(-ENOMEM);
 482
 483         body = lustre_msg_buf(request->rq_reqmsg, 0);
 484         body->data = OBD_BRW_READ;
 485
 486         desc = ptlrpc_prep_bulk(connection);
 487         if (!desc)
 488                 GOTO(out_free, rc = -ENOMEM);
 489         desc->b_portal = OST_BULK_PORTAL;
 490         desc->b_cb = brw_finish;
 491         OBD_ALLOC(cb_data, sizeof(*cb_data));
 492         if (!cb_data)
 493                 GOTO(out_free, rc = -ENOMEM);
 494         cb_data->callback = callback;
 495         desc->b_cb_data = cb_data;
 496         /* XXX end almost identical to brw_write case */
 497
 498         iooptr = lustre_msg_buf(request->rq_reqmsg, 1);
 499         nioptr = lustre_msg_buf(request->rq_reqmsg, 2);
 500         ost_pack_ioo(&iooptr, md, page_count);
 501         for (j = 0; j < page_count; j++) {
 502                 struct ptlrpc_bulk_page *bulk;
 503                 bulk = ptlrpc_prep_bulk_page(desc);
 504                 if (bulk == NULL)
 505                         GOTO(out_unmap, rc = -ENOMEM);
 506
 507                 spin_lock(&connection->c_lock);
 508                 bulk->b_xid = ++connection->c_xid_out;
 509                 spin_unlock(&connection->c_lock);
 510
 511                 bulk->b_buf = kmap(page_array[j]);
 512                 bulk->b_page = page_array[j];
 513                 bulk->b_buflen = PAGE_SIZE;
 514                 ost_pack_niobuf(&nioptr, offset[j], count[j],
 515                                 flags[j], bulk->b_xid);
 516         }
 517
 518         /*
 519          * Register the bulk first, because the reply could arrive out of order,
 520          * and we want to be ready for the bulk data.
 521          *
 522          * One reference is released by the bulk callback, the other when
 523          * we finish sleeping on it (if we don't have a callback).
 524          */
 525         atomic_set(&desc->b_refcount, callback ? 1 : 2);
 526         rc = ptlrpc_register_bulk(desc);
 527         if (rc)
 528                 GOTO(out_unmap, rc);
 529
 530         request->rq_replen = lustre_msg_size(1, size);
 531         rc = ptlrpc_queue_wait(request);
 532         rc = ptlrpc_check_status(request, rc);
 533         if (rc) {
 534                 ptlrpc_bulk_decref(desc);
 535                 GOTO(out_unmap, rc);
 536         }
 537
 538         /* Callbacks cause asynchronous handling. */
 539         if (callback)
 540                 RETURN(0);
 541
 542         l_wait_event_killable(desc->b_waitq, ptlrpc_check_bulk_received(desc));
 543         ptlrpc_bulk_decref(desc);
 544         if (desc->b_flags & PTL_RPC_FL_INTR)
 545                 RETURN(-EINTR);
 546
 547         RETURN(0);
 548
 549         /* Clean up on error. */
 550  out_unmap:
 551         for (j = 0; j < desc->b_page_count; j++)
 552                 kunmap(page_array[j]);
 553  out_free:
 554         if (cb_data)
 555                 OBD_FREE(cb_data, sizeof(*cb_data));
 556         ptlrpc_free_bulk(desc);
 557         ptlrpc_free_req(request);
 558         return rc;
 559 }
 560
 561 static int osc_brw_write(struct lustre_handle *conn,
 562                          struct lov_stripe_md *md, obd_count page_count,
 563                          struct page **pagearray, obd_size *count,
 564                          obd_off *offset, obd_flag *flags,
 565                          bulk_callback_t callback)
 566 {
 567         struct ptlrpc_client *cl;
 568         struct ptlrpc_connection *connection;
 569         struct lustre_handle *rconn;
 570         struct ptlrpc_request *request = NULL;
 571         struct ptlrpc_bulk_desc *desc = NULL;
 572         struct ost_body *body;
 573         struct niobuf_local *local = NULL;
 574         struct niobuf_remote *remote;
 575         struct osc_brw_cb_data *cb_data = NULL;
 576         int rc, j, size[3] = {sizeof(*body)};
 577         void *iooptr, *nioptr;
 578         ENTRY;
 579
 580         size[1] = sizeof(struct obd_ioobj);
 581         size[2] = page_count * sizeof(*remote);
 582
 583         osc_con2cl(conn, &cl, &connection, &rconn);
 584         request = ptlrpc_prep_req2(cl, connection, rconn,
 585                                    OST_BRW, 3, size, NULL);
 586         if (!request)
 587                 RETURN(-ENOMEM);
 588
 589         body = lustre_msg_buf(request->rq_reqmsg, 0);
 590         body->data = OBD_BRW_WRITE;
 591
 592         OBD_ALLOC(local, page_count * sizeof(*local));
 593         if (!local)
 594                 GOTO(out_free, rc = -ENOMEM);
 595
 596         desc = ptlrpc_prep_bulk(connection);
 597         if (!desc)
 598                 GOTO(out_free, rc = -ENOMEM);
 599         desc->b_portal = OSC_BULK_PORTAL;
 600         desc->b_cb = brw_finish;
 601         OBD_ALLOC(cb_data, sizeof(*cb_data));
 602         if (!cb_data)
 603                 GOTO(out_free, rc = -ENOMEM);
 604         cb_data->callback = callback;
 605         desc->b_cb_data = cb_data;
 606         /* XXX end almost identical to brw_read case */
 607         cb_data->obd_data = local;
 608         cb_data->obd_size = page_count * sizeof(*local);
 609
 610         iooptr = lustre_msg_buf(request->rq_reqmsg, 1);
 611         nioptr = lustre_msg_buf(request->rq_reqmsg, 2);
 612         ost_pack_ioo(&iooptr, md, page_count);
 613         for (j = 0; j < page_count; j++) {
 614                 local[j].addr = kmap(pagearray[j]);
 615                 local[j].offset = offset[j];
 616                 local[j].len = count[j];
 617                 ost_pack_niobuf(&nioptr, offset[j], count[j], flags[j], 0);
 618         }
 619
 620         size[1] = page_count * sizeof(struct niobuf_remote);
 621         request->rq_replen = lustre_msg_size(2, size);
 622         rc = ptlrpc_queue_wait(request);
 623         rc = ptlrpc_check_status(request, rc);
 624         if (rc)
 625                 GOTO(out_unmap, rc);
 626
 627         nioptr = lustre_msg_buf(request->rq_repmsg, 1);
 628         if (!nioptr)
 629                 GOTO(out_unmap, rc = -EINVAL);
 630
 631         if (request->rq_repmsg->buflens[1] !=
 632             page_count * sizeof(struct niobuf_remote)) {
 633                 CERROR("buffer length wrong (%d vs. %d)\n",
 634                        request->rq_repmsg->buflens[1],
 635                        page_count * sizeof(struct niobuf_remote));
 636                 GOTO(out_unmap, rc = -EINVAL);
 637         }
 638
 639         for (j = 0; j < page_count; j++) {
 640                 struct ptlrpc_bulk_page *page;
 641
 642                 ost_unpack_niobuf(&nioptr, &remote);
 643
 644                 page = ptlrpc_prep_bulk_page(desc);
 645                 if (!page)
 646                         GOTO(out_unmap, rc = -ENOMEM);
 647
 648                 page->b_buf = (void *)(unsigned long)local[j].addr;
 649                 page->b_buflen = local[j].len;
 650                 page->b_xid = remote->xid;
 651         }
 652
 653         if (desc->b_page_count != page_count)
 654                 LBUG();
 655
 656         /*
 657          * One is released when the bulk is complete, the other when we finish
 658          * waiting on it.  (Callback cases don't sleep, so only one ref for
 659          * them.)
 660          */
 661         atomic_set(&desc->b_refcount, callback ? 1 : 2);
 662         CDEBUG(D_PAGE, "Set refcount of %p to %d\n", desc,
 663                atomic_read(&desc->b_refcount));
 664         rc = ptlrpc_send_bulk(desc);
 665         if (rc)
 666                 GOTO(out_unmap, rc);
 667
 668         /* Callbacks cause asynchronous handling. */
 669         if (callback)
 670                 RETURN(0);
 671
 672         /* If there's no callback function, sleep here until complete. */
 673         l_wait_event_killable(desc->b_waitq, ptlrpc_check_bulk_sent(desc));
 674         ptlrpc_bulk_decref(desc);
 675         if (desc->b_flags & PTL_RPC_FL_INTR)
 676                 RETURN(-EINTR);
 677         RETURN(0);
 678
 679         /* Clean up on error. */
 680  out_unmap:
 681         for (j = 0; j < page_count; j++)
 682                 kunmap(pagearray[j]);
 683
 684  out_free:
 685         if (cb_data)
 686                 OBD_FREE(cb_data, sizeof(*cb_data));
 687         if (local)
 688                 OBD_FREE(local, page_count * sizeof(*local));
 689         ptlrpc_free_bulk(desc);
 690         ptlrpc_req_finished(request);
 691         return rc;
 692 }
 693
 694 static int osc_brw(int cmd, struct lustre_handle *conn,
 695                    struct lov_stripe_md *md, obd_count page_count,
 696                    struct page **page_array,
 697                    obd_size *count,
 698                    obd_off *offset,
 699                    obd_flag *flags,
 700                    void *callback)
 701 {
 702         if (cmd & OBD_BRW_WRITE)
 703                 return osc_brw_write(conn, md, page_count, page_array, count,
 704                                      offset, flags, (bulk_callback_t)callback);
 705         else
 706                 return osc_brw_read(conn, md, page_count, page_array, count,
 707                                     offset, flags, (bulk_callback_t)callback);
 708 }
 709
 710 static int osc_enqueue(struct lustre_handle *conn,
 711                        struct lustre_handle *parent_lock, __u64 *res_id,
 712                        __u32 type, void *extentp, int extent_len, __u32 mode,
 713                        int *flags, void *callback, void *data, int datalen,
 714                        struct lustre_handle *lockh)
 715 {
 716         struct obd_device *obddev = class_conn2obd(conn);
 717         struct ptlrpc_connection *connection;
 718         struct ptlrpc_client *cl;
 719         struct lustre_handle *rconn;
 720         struct ldlm_extent *extent = extentp;
 721         int rc;
 722         __u32 mode2;
 723
 724         /* Filesystem locks are given a bit of special treatment: first we
 725          * fixup the lock to start and end on page boundaries. */
 726         extent->start &= PAGE_MASK;
 727         extent->end = (extent->end + PAGE_SIZE - 1) & PAGE_MASK;
 728
 729         /* Next, search for already existing extent locks that will cover us */
 730         osc_con2dlmcl(conn, &cl, &connection, &rconn);
 731         rc = ldlm_lock_match(obddev->obd_namespace, res_id, type, extent,
 732                              sizeof(extent), mode, lockh);
 733         if (rc == 1) {
 734                 /* We already have a lock, and it's referenced */
 735                 return 0;
 736         }
 737
 738         /* Next, search for locks that we can upgrade (if we're trying to write)
 739          * or are more than we need (if we're trying to read).  Because the VFS
 740          * and page cache already protect us locally, lots of readers/writers
 741          * can share a single PW lock. */
 742         if (mode == LCK_PW)
 743                 mode2 = LCK_PR;
 744         else
 745                 mode2 = LCK_PW;
 746
 747         rc = ldlm_lock_match(obddev->obd_namespace, res_id, type, extent,
 748                              sizeof(extent), mode2, lockh);
 749         if (rc == 1) {
 750                 int flags;
 751                 /* FIXME: This is not incredibly elegant, but it might
 752                  * be more elegant than adding another parameter to
 753                  * lock_match.  I want a second opinion. */
 754                 ldlm_lock_addref(lockh, mode);
 755                 ldlm_lock_decref(lockh, mode2);
 756
 757                 if (mode == LCK_PR)
 758                         return 0;
 759
 760                 rc = ldlm_cli_convert(cl, lockh, rconn, mode, &flags);
 761                 if (rc)
 762                         LBUG();
 763
 764                 return rc;
 765         }
 766
 767         rc = ldlm_cli_enqueue(cl, connection, rconn, NULL,obddev->obd_namespace,
 768                               parent_lock, res_id, type, extent, sizeof(extent),
 769                               mode, flags, callback, data, datalen, lockh);
 770         return rc;
 771 }
 772
 773 static int osc_cancel(struct lustre_handle *oconn, __u32 mode,
 774                       struct lustre_handle *lockh)
 775 {
 776         ENTRY;
 777
 778         ldlm_lock_decref(lockh, mode);
 779
 780         RETURN(0);
 781 }
 782
 783 static int osc_setup(struct obd_device *obddev, obd_count len, void *buf)
 784 {
 785         struct obd_ioctl_data* data = buf;
 786         struct osc_obd *osc = &obddev->u.osc;
 787         char server_uuid[37];
 788         int rc;
 789         ENTRY;
 790
 791         if (data->ioc_inllen1 < 1) {
 792                 CERROR("osc setup requires a TARGET UUID\n");
 793                 RETURN(-EINVAL);
 794         }
 795
 796         if (data->ioc_inllen1 > 37) {
 797                 CERROR("osc TARGET UUID must be less than 38 characters\n");
 798                 RETURN(-EINVAL);
 799         }
 800
 801         if (data->ioc_inllen2 < 1) {
 802                 CERROR("osc setup requires a SERVER UUID\n");
 803                 RETURN(-EINVAL);
 804         }
 805
 806         if (data->ioc_inllen2 > 37) {
 807                 CERROR("osc SERVER UUID must be less than 38 characters\n");
 808                 RETURN(-EINVAL);
 809         }
 810
 811         memcpy(osc->osc_target_uuid, data->ioc_inlbuf1, data->ioc_inllen1);
 812         memcpy(server_uuid, data->ioc_inlbuf2, MIN(data->ioc_inllen2,
 813                                                    sizeof(server_uuid)));
 814
 815         osc->osc_conn = ptlrpc_uuid_to_connection(server_uuid);
 816         if (!osc->osc_conn)
 817                 RETURN(-ENOENT);
 818
 819         obddev->obd_namespace =
 820                 ldlm_namespace_new("osc", LDLM_NAMESPACE_CLIENT);
 821         if (obddev->obd_namespace == NULL)
 822                 GOTO(out_conn, rc = -ENOMEM);
 823
 824         OBD_ALLOC(osc->osc_client, sizeof(*osc->osc_client));
 825         if (osc->osc_client == NULL)
 826                 GOTO(out_ns, rc = -ENOMEM);
 827
 828         OBD_ALLOC(osc->osc_ldlm_client, sizeof(*osc->osc_ldlm_client));
 829         if (osc->osc_ldlm_client == NULL)
 830                 GOTO(out_client, rc = -ENOMEM);
 831
 832         ptlrpc_init_client(NULL, NULL, OST_REQUEST_PORTAL, OSC_REPLY_PORTAL,
 833                            osc->osc_client);
 834         ptlrpc_init_client(NULL, NULL, LDLM_REQUEST_PORTAL, LDLM_REPLY_PORTAL,
 835                            osc->osc_ldlm_client);
 836         osc->osc_client->cli_name = "osc";
 837         osc->osc_ldlm_client->cli_name = "ldlm";
 838
 839         MOD_INC_USE_COUNT;
 840         RETURN(0);
 841
 842  out_client:
 843         OBD_FREE(osc->osc_client, sizeof(*osc->osc_client));
 844  out_ns:
 845         ldlm_namespace_free(obddev->obd_namespace);
 846  out_conn:
 847         ptlrpc_put_connection(osc->osc_conn);
 848         return rc;
 849 }
 850
 851 static int osc_cleanup(struct obd_device * obddev)
 852 {
 853         struct osc_obd *osc = &obddev->u.osc;
 854
 855         ldlm_namespace_free(obddev->obd_namespace);
 856
 857         ptlrpc_cleanup_client(osc->osc_client);
 858         OBD_FREE(osc->osc_client, sizeof(*osc->osc_client));
 859         ptlrpc_cleanup_client(osc->osc_ldlm_client);
 860         OBD_FREE(osc->osc_ldlm_client, sizeof(*osc->osc_ldlm_client));
 861         ptlrpc_put_connection(osc->osc_conn);
 862
 863         MOD_DEC_USE_COUNT;
 864         return 0;
 865 }
 866
 867 static int osc_statfs(struct lustre_handle *conn, struct statfs *sfs)
 868 {
 869         struct ptlrpc_request *request;
 870         struct ptlrpc_client *cl;
 871         struct ptlrpc_connection *connection;
 872         struct lustre_handle *rconn;
 873         struct obd_statfs *osfs;
 874         int rc, size = sizeof(*osfs);
 875         ENTRY;
 876
 877         osc_con2cl(conn, &cl, &connection, &rconn);
 878         request = ptlrpc_prep_req2(cl, connection, rconn,
 879                                    OST_STATFS, 0, NULL, NULL);
 880         if (!request)
 881                 RETURN(-ENOMEM);
 882
 883         request->rq_replen = lustre_msg_size(1, &size);
 884
 885         rc = ptlrpc_queue_wait(request);
 886         rc = ptlrpc_check_status(request, rc);
 887         if (rc) {
 888                 CERROR("%s failed: rc = %d\n", __FUNCTION__, rc);
 889                 GOTO(out, rc);
 890         }
 891
 892         osfs = lustre_msg_buf(request->rq_repmsg, 0);
 893         obd_statfs_unpack(osfs, sfs);
 894
 895         EXIT;
 896  out:
 897         ptlrpc_free_req(request);
 898         return rc;
 899 }
 900
 901 struct obd_ops osc_obd_ops = {
 902         o_setup:        osc_setup,
 903         o_cleanup:      osc_cleanup,
 904         o_statfs:       osc_statfs,
 905         o_create:       osc_create,
 906         o_destroy:      osc_destroy,
 907         o_getattr:      osc_getattr,
 908         o_setattr:      osc_setattr,
 909         o_open:         osc_open,
 910         o_close:        osc_close,
 911         o_connect:      osc_connect,
 912         o_disconnect:   osc_disconnect,
 913         o_brw:          osc_brw,
 914         o_punch:        osc_punch,
 915         o_enqueue:      osc_enqueue,
 916         o_cancel:       osc_cancel
 917 };
 918
 919 static int __init osc_init(void)
 920 {
 921         return class_register_type(&osc_obd_ops, LUSTRE_OSC_NAME);
 922 }
 923
 924 static void __exit osc_exit(void)
 925 {
 926         class_unregister_type(LUSTRE_OSC_NAME);
 927 }
 928
 929 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 930 MODULE_DESCRIPTION("Lustre Object Storage Client (OSC) v1.0");
 931 MODULE_LICENSE("GPL");
 932
 933 module_init(osc_init);
 934 module_exit(osc_exit);