drivers/staging/lustre/lustre/ptlrpc/layout.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2015, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lustre/ptlrpc/layout.c
  33  *
  34  * Lustre Metadata Target (mdt) request handler
  35  *
  36  * Author: Nikita Danilov <nikita@clusterfs.com>
  37  */
  38 /*
  39  * This file contains the "capsule/pill" abstraction layered above PTLRPC.
  40  *
  41  * Every struct ptlrpc_request contains a "pill", which points to a description
  42  * of the format that the request conforms to.
  43  */
  44
  45 #define DEBUG_SUBSYSTEM S_RPC
  46
  47 #include <linux/module.h>
  48
  49 #include <uapi/linux/lustre/lustre_idl.h>
  50
  51 #include <llog_swab.h>
  52 #include <lustre_debug.h>
  53 #include <lustre_swab.h>
  54 #include <uapi/linux/lustre/lustre_ver.h>
  55 #include <obd.h>
  56 #include <obd_support.h>
  57
  58 /* struct ptlrpc_request, lustre_msg* */
  59 #include <lustre_req_layout.h>
  60 #include <lustre_acl.h>
  61
  62 /*
  63  * RQFs (see below) refer to two struct req_msg_field arrays describing the
  64  * client request and server reply, respectively.
  65  */
  66 /* empty set of fields... for suitable definition of emptiness. */
  67 static const struct req_msg_field *empty[] = {
  68         &RMF_PTLRPC_BODY
  69 };
  70
  71 static const struct req_msg_field *mgs_target_info_only[] = {
  72         &RMF_PTLRPC_BODY,
  73         &RMF_MGS_TARGET_INFO
  74 };
  75
  76 static const struct req_msg_field *mgs_set_info[] = {
  77         &RMF_PTLRPC_BODY,
  78         &RMF_MGS_SEND_PARAM
  79 };
  80
  81 static const struct req_msg_field *mgs_config_read_client[] = {
  82         &RMF_PTLRPC_BODY,
  83         &RMF_MGS_CONFIG_BODY
  84 };
  85
  86 static const struct req_msg_field *mgs_config_read_server[] = {
  87         &RMF_PTLRPC_BODY,
  88         &RMF_MGS_CONFIG_RES
  89 };
  90
  91 static const struct req_msg_field *log_cancel_client[] = {
  92         &RMF_PTLRPC_BODY,
  93         &RMF_LOGCOOKIES
  94 };
  95
  96 static const struct req_msg_field *mdt_body_only[] = {
  97         &RMF_PTLRPC_BODY,
  98         &RMF_MDT_BODY
  99 };
 100
 101 static const struct req_msg_field *mdt_body_capa[] = {
 102         &RMF_PTLRPC_BODY,
 103         &RMF_MDT_BODY,
 104         &RMF_CAPA1
 105 };
 106
 107 static const struct req_msg_field *quotactl_only[] = {
 108         &RMF_PTLRPC_BODY,
 109         &RMF_OBD_QUOTACTL
 110 };
 111
 112 static const struct req_msg_field *mdt_close_client[] = {
 113         &RMF_PTLRPC_BODY,
 114         &RMF_MDT_EPOCH,
 115         &RMF_REC_REINT,
 116         &RMF_CAPA1
 117 };
 118
 119 static const struct req_msg_field *mdt_intent_close_client[] = {
 120         &RMF_PTLRPC_BODY,
 121         &RMF_MDT_EPOCH,
 122         &RMF_REC_REINT,
 123         &RMF_CAPA1,
 124         &RMF_CLOSE_DATA
 125 };
 126
 127 static const struct req_msg_field *obd_statfs_server[] = {
 128         &RMF_PTLRPC_BODY,
 129         &RMF_OBD_STATFS
 130 };
 131
 132 static const struct req_msg_field *seq_query_client[] = {
 133         &RMF_PTLRPC_BODY,
 134         &RMF_SEQ_OPC,
 135         &RMF_SEQ_RANGE
 136 };
 137
 138 static const struct req_msg_field *seq_query_server[] = {
 139         &RMF_PTLRPC_BODY,
 140         &RMF_SEQ_RANGE
 141 };
 142
 143 static const struct req_msg_field *fld_query_client[] = {
 144         &RMF_PTLRPC_BODY,
 145         &RMF_FLD_OPC,
 146         &RMF_FLD_MDFLD
 147 };
 148
 149 static const struct req_msg_field *fld_query_server[] = {
 150         &RMF_PTLRPC_BODY,
 151         &RMF_FLD_MDFLD
 152 };
 153
 154 static const struct req_msg_field *fld_read_client[] = {
 155         &RMF_PTLRPC_BODY,
 156         &RMF_FLD_MDFLD
 157 };
 158
 159 static const struct req_msg_field *fld_read_server[] = {
 160         &RMF_PTLRPC_BODY,
 161         &RMF_GENERIC_DATA
 162 };
 163
 164 static const struct req_msg_field *mds_getattr_name_client[] = {
 165         &RMF_PTLRPC_BODY,
 166         &RMF_MDT_BODY,
 167         &RMF_CAPA1,
 168         &RMF_NAME
 169 };
 170
 171 static const struct req_msg_field *mds_reint_client[] = {
 172         &RMF_PTLRPC_BODY,
 173         &RMF_REC_REINT
 174 };
 175
 176 static const struct req_msg_field *mds_reint_create_client[] = {
 177         &RMF_PTLRPC_BODY,
 178         &RMF_REC_REINT,
 179         &RMF_CAPA1,
 180         &RMF_NAME
 181 };
 182
 183 static const struct req_msg_field *mds_reint_create_slave_client[] = {
 184         &RMF_PTLRPC_BODY,
 185         &RMF_REC_REINT,
 186         &RMF_CAPA1,
 187         &RMF_NAME,
 188         &RMF_EADATA,
 189         &RMF_DLM_REQ
 190 };
 191
 192 static const struct req_msg_field *mds_reint_create_acl_client[] = {
 193         &RMF_PTLRPC_BODY,
 194         &RMF_REC_REINT,
 195         &RMF_CAPA1,
 196         &RMF_NAME,
 197         &RMF_EADATA,
 198         &RMF_DLM_REQ
 199 };
 200
 201 static const struct req_msg_field *mds_reint_create_sym_client[] = {
 202         &RMF_PTLRPC_BODY,
 203         &RMF_REC_REINT,
 204         &RMF_CAPA1,
 205         &RMF_NAME,
 206         &RMF_SYMTGT,
 207         &RMF_DLM_REQ
 208 };
 209
 210 static const struct req_msg_field *mds_reint_open_client[] = {
 211         &RMF_PTLRPC_BODY,
 212         &RMF_REC_REINT,
 213         &RMF_CAPA1,
 214         &RMF_CAPA2,
 215         &RMF_NAME,
 216         &RMF_EADATA
 217 };
 218
 219 static const struct req_msg_field *mds_reint_open_server[] = {
 220         &RMF_PTLRPC_BODY,
 221         &RMF_MDT_BODY,
 222         &RMF_MDT_MD,
 223         &RMF_ACL,
 224         &RMF_CAPA1,
 225         &RMF_CAPA2
 226 };
 227
 228 static const struct req_msg_field *mds_reint_unlink_client[] = {
 229         &RMF_PTLRPC_BODY,
 230         &RMF_REC_REINT,
 231         &RMF_CAPA1,
 232         &RMF_NAME,
 233         &RMF_DLM_REQ
 234 };
 235
 236 static const struct req_msg_field *mds_reint_link_client[] = {
 237         &RMF_PTLRPC_BODY,
 238         &RMF_REC_REINT,
 239         &RMF_CAPA1,
 240         &RMF_CAPA2,
 241         &RMF_NAME,
 242         &RMF_DLM_REQ
 243 };
 244
 245 static const struct req_msg_field *mds_reint_rename_client[] = {
 246         &RMF_PTLRPC_BODY,
 247         &RMF_REC_REINT,
 248         &RMF_CAPA1,
 249         &RMF_CAPA2,
 250         &RMF_NAME,
 251         &RMF_SYMTGT,
 252         &RMF_DLM_REQ
 253 };
 254
 255 static const struct req_msg_field *mds_reint_migrate_client[] = {
 256         &RMF_PTLRPC_BODY,
 257         &RMF_REC_REINT,
 258         &RMF_CAPA1,
 259         &RMF_CAPA2,
 260         &RMF_NAME,
 261         &RMF_SYMTGT,
 262         &RMF_DLM_REQ,
 263         &RMF_MDT_EPOCH,
 264         &RMF_CLOSE_DATA
 265 };
 266
 267 static const struct req_msg_field *mds_last_unlink_server[] = {
 268         &RMF_PTLRPC_BODY,
 269         &RMF_MDT_BODY,
 270         &RMF_MDT_MD,
 271         &RMF_LOGCOOKIES,
 272         &RMF_CAPA1,
 273         &RMF_CAPA2
 274 };
 275
 276 static const struct req_msg_field *mds_reint_setattr_client[] = {
 277         &RMF_PTLRPC_BODY,
 278         &RMF_REC_REINT,
 279         &RMF_CAPA1,
 280         &RMF_MDT_EPOCH,
 281         &RMF_EADATA,
 282         &RMF_LOGCOOKIES,
 283         &RMF_DLM_REQ
 284 };
 285
 286 static const struct req_msg_field *mds_reint_setxattr_client[] = {
 287         &RMF_PTLRPC_BODY,
 288         &RMF_REC_REINT,
 289         &RMF_CAPA1,
 290         &RMF_NAME,
 291         &RMF_EADATA,
 292         &RMF_DLM_REQ
 293 };
 294
 295 static const struct req_msg_field *mdt_swap_layouts[] = {
 296         &RMF_PTLRPC_BODY,
 297         &RMF_MDT_BODY,
 298         &RMF_SWAP_LAYOUTS,
 299         &RMF_CAPA1,
 300         &RMF_CAPA2,
 301         &RMF_DLM_REQ
 302 };
 303
 304 static const struct req_msg_field *obd_connect_client[] = {
 305         &RMF_PTLRPC_BODY,
 306         &RMF_TGTUUID,
 307         &RMF_CLUUID,
 308         &RMF_CONN,
 309         &RMF_CONNECT_DATA
 310 };
 311
 312 static const struct req_msg_field *obd_connect_server[] = {
 313         &RMF_PTLRPC_BODY,
 314         &RMF_CONNECT_DATA
 315 };
 316
 317 static const struct req_msg_field *obd_set_info_client[] = {
 318         &RMF_PTLRPC_BODY,
 319         &RMF_SETINFO_KEY,
 320         &RMF_SETINFO_VAL
 321 };
 322
 323 static const struct req_msg_field *ost_grant_shrink_client[] = {
 324         &RMF_PTLRPC_BODY,
 325         &RMF_SETINFO_KEY,
 326         &RMF_OST_BODY
 327 };
 328
 329 static const struct req_msg_field *mds_getinfo_client[] = {
 330         &RMF_PTLRPC_BODY,
 331         &RMF_GETINFO_KEY,
 332         &RMF_GETINFO_VALLEN
 333 };
 334
 335 static const struct req_msg_field *mds_getinfo_server[] = {
 336         &RMF_PTLRPC_BODY,
 337         &RMF_GETINFO_VAL,
 338 };
 339
 340 static const struct req_msg_field *ldlm_enqueue_client[] = {
 341         &RMF_PTLRPC_BODY,
 342         &RMF_DLM_REQ
 343 };
 344
 345 static const struct req_msg_field *ldlm_enqueue_server[] = {
 346         &RMF_PTLRPC_BODY,
 347         &RMF_DLM_REP
 348 };
 349
 350 static const struct req_msg_field *ldlm_enqueue_lvb_server[] = {
 351         &RMF_PTLRPC_BODY,
 352         &RMF_DLM_REP,
 353         &RMF_DLM_LVB
 354 };
 355
 356 static const struct req_msg_field *ldlm_cp_callback_client[] = {
 357         &RMF_PTLRPC_BODY,
 358         &RMF_DLM_REQ,
 359         &RMF_DLM_LVB
 360 };
 361
 362 static const struct req_msg_field *ldlm_gl_callback_desc_client[] = {
 363         &RMF_PTLRPC_BODY,
 364         &RMF_DLM_REQ,
 365         &RMF_DLM_GL_DESC
 366 };
 367
 368 static const struct req_msg_field *ldlm_gl_callback_server[] = {
 369         &RMF_PTLRPC_BODY,
 370         &RMF_DLM_LVB
 371 };
 372
 373 static const struct req_msg_field *ldlm_intent_basic_client[] = {
 374         &RMF_PTLRPC_BODY,
 375         &RMF_DLM_REQ,
 376         &RMF_LDLM_INTENT,
 377 };
 378
 379 static const struct req_msg_field *ldlm_intent_client[] = {
 380         &RMF_PTLRPC_BODY,
 381         &RMF_DLM_REQ,
 382         &RMF_LDLM_INTENT,
 383         &RMF_REC_REINT
 384 };
 385
 386 static const struct req_msg_field *ldlm_intent_server[] = {
 387         &RMF_PTLRPC_BODY,
 388         &RMF_DLM_REP,
 389         &RMF_MDT_BODY,
 390         &RMF_MDT_MD,
 391         &RMF_ACL
 392 };
 393
 394 static const struct req_msg_field *ldlm_intent_layout_client[] = {
 395         &RMF_PTLRPC_BODY,
 396         &RMF_DLM_REQ,
 397         &RMF_LDLM_INTENT,
 398         &RMF_LAYOUT_INTENT,
 399         &RMF_EADATA /* for new layout to be set up */
 400 };
 401
 402 static const struct req_msg_field *ldlm_intent_open_server[] = {
 403         &RMF_PTLRPC_BODY,
 404         &RMF_DLM_REP,
 405         &RMF_MDT_BODY,
 406         &RMF_MDT_MD,
 407         &RMF_ACL,
 408         &RMF_CAPA1,
 409         &RMF_CAPA2
 410 };
 411
 412 static const struct req_msg_field *ldlm_intent_getattr_client[] = {
 413         &RMF_PTLRPC_BODY,
 414         &RMF_DLM_REQ,
 415         &RMF_LDLM_INTENT,
 416         &RMF_MDT_BODY,     /* coincides with mds_getattr_name_client[] */
 417         &RMF_CAPA1,
 418         &RMF_NAME
 419 };
 420
 421 static const struct req_msg_field *ldlm_intent_getattr_server[] = {
 422         &RMF_PTLRPC_BODY,
 423         &RMF_DLM_REP,
 424         &RMF_MDT_BODY,
 425         &RMF_MDT_MD,
 426         &RMF_ACL,
 427         &RMF_CAPA1
 428 };
 429
 430 static const struct req_msg_field *ldlm_intent_create_client[] = {
 431         &RMF_PTLRPC_BODY,
 432         &RMF_DLM_REQ,
 433         &RMF_LDLM_INTENT,
 434         &RMF_REC_REINT,    /* coincides with mds_reint_create_client[] */
 435         &RMF_CAPA1,
 436         &RMF_NAME,
 437         &RMF_EADATA
 438 };
 439
 440 static const struct req_msg_field *ldlm_intent_open_client[] = {
 441         &RMF_PTLRPC_BODY,
 442         &RMF_DLM_REQ,
 443         &RMF_LDLM_INTENT,
 444         &RMF_REC_REINT,    /* coincides with mds_reint_open_client[] */
 445         &RMF_CAPA1,
 446         &RMF_CAPA2,
 447         &RMF_NAME,
 448         &RMF_EADATA
 449 };
 450
 451 static const struct req_msg_field *ldlm_intent_unlink_client[] = {
 452         &RMF_PTLRPC_BODY,
 453         &RMF_DLM_REQ,
 454         &RMF_LDLM_INTENT,
 455         &RMF_REC_REINT,    /* coincides with mds_reint_unlink_client[] */
 456         &RMF_CAPA1,
 457         &RMF_NAME
 458 };
 459
 460 static const struct req_msg_field *ldlm_intent_getxattr_client[] = {
 461         &RMF_PTLRPC_BODY,
 462         &RMF_DLM_REQ,
 463         &RMF_LDLM_INTENT,
 464         &RMF_MDT_BODY,
 465         &RMF_CAPA1,
 466 };
 467
 468 static const struct req_msg_field *ldlm_intent_getxattr_server[] = {
 469         &RMF_PTLRPC_BODY,
 470         &RMF_DLM_REP,
 471         &RMF_MDT_BODY,
 472         &RMF_MDT_MD,
 473         &RMF_ACL, /* for req_capsule_extend/mdt_intent_policy */
 474         &RMF_EADATA,
 475         &RMF_EAVALS,
 476         &RMF_EAVALS_LENS
 477 };
 478
 479 static const struct req_msg_field *mds_getxattr_client[] = {
 480         &RMF_PTLRPC_BODY,
 481         &RMF_MDT_BODY,
 482         &RMF_CAPA1,
 483         &RMF_NAME,
 484         &RMF_EADATA
 485 };
 486
 487 static const struct req_msg_field *mds_getxattr_server[] = {
 488         &RMF_PTLRPC_BODY,
 489         &RMF_MDT_BODY,
 490         &RMF_EADATA
 491 };
 492
 493 static const struct req_msg_field *mds_getattr_server[] = {
 494         &RMF_PTLRPC_BODY,
 495         &RMF_MDT_BODY,
 496         &RMF_MDT_MD,
 497         &RMF_ACL,
 498         &RMF_CAPA1,
 499         &RMF_CAPA2
 500 };
 501
 502 static const struct req_msg_field *mds_setattr_server[] = {
 503         &RMF_PTLRPC_BODY,
 504         &RMF_MDT_BODY,
 505         &RMF_MDT_MD,
 506         &RMF_ACL,
 507         &RMF_CAPA1,
 508         &RMF_CAPA2
 509 };
 510
 511 static const struct req_msg_field *llog_origin_handle_create_client[] = {
 512         &RMF_PTLRPC_BODY,
 513         &RMF_LLOGD_BODY,
 514         &RMF_NAME
 515 };
 516
 517 static const struct req_msg_field *llogd_body_only[] = {
 518         &RMF_PTLRPC_BODY,
 519         &RMF_LLOGD_BODY
 520 };
 521
 522 static const struct req_msg_field *llog_log_hdr_only[] = {
 523         &RMF_PTLRPC_BODY,
 524         &RMF_LLOG_LOG_HDR
 525 };
 526
 527 static const struct req_msg_field *llogd_conn_body_only[] = {
 528         &RMF_PTLRPC_BODY,
 529         &RMF_LLOGD_CONN_BODY
 530 };
 531
 532 static const struct req_msg_field *llog_origin_handle_next_block_server[] = {
 533         &RMF_PTLRPC_BODY,
 534         &RMF_LLOGD_BODY,
 535         &RMF_EADATA
 536 };
 537
 538 static const struct req_msg_field *ost_body_only[] = {
 539         &RMF_PTLRPC_BODY,
 540         &RMF_OST_BODY
 541 };
 542
 543 static const struct req_msg_field *ost_body_capa[] = {
 544         &RMF_PTLRPC_BODY,
 545         &RMF_OST_BODY,
 546         &RMF_CAPA1
 547 };
 548
 549 static const struct req_msg_field *ost_destroy_client[] = {
 550         &RMF_PTLRPC_BODY,
 551         &RMF_OST_BODY,
 552         &RMF_DLM_REQ,
 553         &RMF_CAPA1
 554 };
 555
 556 static const struct req_msg_field *ost_brw_client[] = {
 557         &RMF_PTLRPC_BODY,
 558         &RMF_OST_BODY,
 559         &RMF_OBD_IOOBJ,
 560         &RMF_NIOBUF_REMOTE,
 561         &RMF_CAPA1
 562 };
 563
 564 static const struct req_msg_field *ost_brw_read_server[] = {
 565         &RMF_PTLRPC_BODY,
 566         &RMF_OST_BODY
 567 };
 568
 569 static const struct req_msg_field *ost_brw_write_server[] = {
 570         &RMF_PTLRPC_BODY,
 571         &RMF_OST_BODY,
 572         &RMF_RCS
 573 };
 574
 575 static const struct req_msg_field *ost_get_info_generic_server[] = {
 576         &RMF_PTLRPC_BODY,
 577         &RMF_GENERIC_DATA,
 578 };
 579
 580 static const struct req_msg_field *ost_get_info_generic_client[] = {
 581         &RMF_PTLRPC_BODY,
 582         &RMF_GETINFO_KEY
 583 };
 584
 585 static const struct req_msg_field *ost_get_last_id_server[] = {
 586         &RMF_PTLRPC_BODY,
 587         &RMF_OBD_ID
 588 };
 589
 590 static const struct req_msg_field *ost_get_last_fid_client[] = {
 591         &RMF_PTLRPC_BODY,
 592         &RMF_GETINFO_KEY,
 593         &RMF_FID,
 594 };
 595
 596 static const struct req_msg_field *ost_get_last_fid_server[] = {
 597         &RMF_PTLRPC_BODY,
 598         &RMF_FID,
 599 };
 600
 601 static const struct req_msg_field *ost_get_fiemap_client[] = {
 602         &RMF_PTLRPC_BODY,
 603         &RMF_FIEMAP_KEY,
 604         &RMF_FIEMAP_VAL
 605 };
 606
 607 static const struct req_msg_field *ost_get_fiemap_server[] = {
 608         &RMF_PTLRPC_BODY,
 609         &RMF_FIEMAP_VAL
 610 };
 611
 612 static const struct req_msg_field *mdt_hsm_progress[] = {
 613         &RMF_PTLRPC_BODY,
 614         &RMF_MDT_BODY,
 615         &RMF_MDS_HSM_PROGRESS,
 616 };
 617
 618 static const struct req_msg_field *mdt_hsm_ct_register[] = {
 619         &RMF_PTLRPC_BODY,
 620         &RMF_MDT_BODY,
 621         &RMF_MDS_HSM_ARCHIVE,
 622 };
 623
 624 static const struct req_msg_field *mdt_hsm_ct_unregister[] = {
 625         &RMF_PTLRPC_BODY,
 626         &RMF_MDT_BODY,
 627 };
 628
 629 static const struct req_msg_field *mdt_hsm_action_server[] = {
 630         &RMF_PTLRPC_BODY,
 631         &RMF_MDT_BODY,
 632         &RMF_MDS_HSM_CURRENT_ACTION,
 633 };
 634
 635 static const struct req_msg_field *mdt_hsm_state_get_server[] = {
 636         &RMF_PTLRPC_BODY,
 637         &RMF_MDT_BODY,
 638         &RMF_HSM_USER_STATE,
 639 };
 640
 641 static const struct req_msg_field *mdt_hsm_state_set[] = {
 642         &RMF_PTLRPC_BODY,
 643         &RMF_MDT_BODY,
 644         &RMF_CAPA1,
 645         &RMF_HSM_STATE_SET,
 646 };
 647
 648 static const struct req_msg_field *mdt_hsm_request[] = {
 649         &RMF_PTLRPC_BODY,
 650         &RMF_MDT_BODY,
 651         &RMF_MDS_HSM_REQUEST,
 652         &RMF_MDS_HSM_USER_ITEM,
 653         &RMF_GENERIC_DATA,
 654 };
 655
 656 static struct req_format *req_formats[] = {
 657         &RQF_OBD_PING,
 658         &RQF_OBD_SET_INFO,
 659         &RQF_SEC_CTX,
 660         &RQF_MGS_TARGET_REG,
 661         &RQF_MGS_SET_INFO,
 662         &RQF_MGS_CONFIG_READ,
 663         &RQF_SEQ_QUERY,
 664         &RQF_FLD_QUERY,
 665         &RQF_FLD_READ,
 666         &RQF_MDS_CONNECT,
 667         &RQF_MDS_DISCONNECT,
 668         &RQF_MDS_GET_INFO,
 669         &RQF_MDS_GETSTATUS,
 670         &RQF_MDS_STATFS,
 671         &RQF_MDS_GETATTR,
 672         &RQF_MDS_GETATTR_NAME,
 673         &RQF_MDS_GETXATTR,
 674         &RQF_MDS_SYNC,
 675         &RQF_MDS_CLOSE,
 676         &RQF_MDS_INTENT_CLOSE,
 677         &RQF_MDS_READPAGE,
 678         &RQF_MDS_WRITEPAGE,
 679         &RQF_MDS_REINT,
 680         &RQF_MDS_REINT_CREATE,
 681         &RQF_MDS_REINT_CREATE_ACL,
 682         &RQF_MDS_REINT_CREATE_SLAVE,
 683         &RQF_MDS_REINT_CREATE_SYM,
 684         &RQF_MDS_REINT_OPEN,
 685         &RQF_MDS_REINT_UNLINK,
 686         &RQF_MDS_REINT_LINK,
 687         &RQF_MDS_REINT_RENAME,
 688         &RQF_MDS_REINT_MIGRATE,
 689         &RQF_MDS_REINT_SETATTR,
 690         &RQF_MDS_REINT_SETXATTR,
 691         &RQF_MDS_QUOTACTL,
 692         &RQF_MDS_HSM_PROGRESS,
 693         &RQF_MDS_HSM_CT_REGISTER,
 694         &RQF_MDS_HSM_CT_UNREGISTER,
 695         &RQF_MDS_HSM_STATE_GET,
 696         &RQF_MDS_HSM_STATE_SET,
 697         &RQF_MDS_HSM_ACTION,
 698         &RQF_MDS_HSM_REQUEST,
 699         &RQF_MDS_SWAP_LAYOUTS,
 700         &RQF_OST_CONNECT,
 701         &RQF_OST_DISCONNECT,
 702         &RQF_OST_QUOTACTL,
 703         &RQF_OST_GETATTR,
 704         &RQF_OST_SETATTR,
 705         &RQF_OST_CREATE,
 706         &RQF_OST_PUNCH,
 707         &RQF_OST_SYNC,
 708         &RQF_OST_DESTROY,
 709         &RQF_OST_BRW_READ,
 710         &RQF_OST_BRW_WRITE,
 711         &RQF_OST_STATFS,
 712         &RQF_OST_SET_GRANT_INFO,
 713         &RQF_OST_GET_INFO,
 714         &RQF_OST_GET_INFO_LAST_ID,
 715         &RQF_OST_GET_INFO_LAST_FID,
 716         &RQF_OST_SET_INFO_LAST_FID,
 717         &RQF_OST_GET_INFO_FIEMAP,
 718         &RQF_LDLM_ENQUEUE,
 719         &RQF_LDLM_ENQUEUE_LVB,
 720         &RQF_LDLM_CONVERT,
 721         &RQF_LDLM_CANCEL,
 722         &RQF_LDLM_CALLBACK,
 723         &RQF_LDLM_CP_CALLBACK,
 724         &RQF_LDLM_BL_CALLBACK,
 725         &RQF_LDLM_GL_CALLBACK,
 726         &RQF_LDLM_GL_DESC_CALLBACK,
 727         &RQF_LDLM_INTENT,
 728         &RQF_LDLM_INTENT_BASIC,
 729         &RQF_LDLM_INTENT_LAYOUT,
 730         &RQF_LDLM_INTENT_GETATTR,
 731         &RQF_LDLM_INTENT_OPEN,
 732         &RQF_LDLM_INTENT_CREATE,
 733         &RQF_LDLM_INTENT_UNLINK,
 734         &RQF_LDLM_INTENT_GETXATTR,
 735         &RQF_LOG_CANCEL,
 736         &RQF_LLOG_ORIGIN_HANDLE_CREATE,
 737         &RQF_LLOG_ORIGIN_HANDLE_DESTROY,
 738         &RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK,
 739         &RQF_LLOG_ORIGIN_HANDLE_PREV_BLOCK,
 740         &RQF_LLOG_ORIGIN_HANDLE_READ_HEADER,
 741         &RQF_LLOG_ORIGIN_CONNECT,
 742         &RQF_CONNECT,
 743 };
 744
 745 struct req_msg_field {
 746         const __u32 rmf_flags;
 747         const char  *rmf_name;
 748         /**
 749          * Field length. (-1) means "variable length".  If the
 750          * \a RMF_F_STRUCT_ARRAY flag is set the field is also variable-length,
 751          * but the actual size must be a whole multiple of \a rmf_size.
 752          */
 753         const int   rmf_size;
 754         void    (*rmf_swabber)(void *);
 755         void    (*rmf_dumper)(void *);
 756         int      rmf_offset[ARRAY_SIZE(req_formats)][RCL_NR];
 757 };
 758
 759 enum rmf_flags {
 760         /**
 761          * The field is a string, must be NUL-terminated.
 762          */
 763         RMF_F_STRING = BIT(0),
 764         /**
 765          * The field's buffer size need not match the declared \a rmf_size.
 766          */
 767         RMF_F_NO_SIZE_CHECK = BIT(1),
 768         /**
 769          * The field's buffer size must be a whole multiple of the declared \a
 770          * rmf_size and the \a rmf_swabber function must work on the declared \a
 771          * rmf_size worth of bytes.
 772          */
 773         RMF_F_STRUCT_ARRAY = BIT(2)
 774 };
 775
 776 struct req_capsule;
 777
 778 /*
 779  * Request fields.
 780  */
 781 #define DEFINE_MSGF(name, flags, size, swabber, dumper) {       \
 782         .rmf_name    = (name),                                  \
 783         .rmf_flags   = (flags),                                 \
 784         .rmf_size    = (size),                                  \
 785         .rmf_swabber = (void (*)(void *))(swabber),             \
 786         .rmf_dumper  = (void (*)(void *))(dumper)               \
 787 }
 788
 789 struct req_msg_field RMF_GENERIC_DATA =
 790         DEFINE_MSGF("generic_data", 0,
 791                     -1, NULL, NULL);
 792 EXPORT_SYMBOL(RMF_GENERIC_DATA);
 793
 794 struct req_msg_field RMF_MGS_TARGET_INFO =
 795         DEFINE_MSGF("mgs_target_info", 0,
 796                     sizeof(struct mgs_target_info),
 797                     lustre_swab_mgs_target_info, NULL);
 798 EXPORT_SYMBOL(RMF_MGS_TARGET_INFO);
 799
 800 struct req_msg_field RMF_MGS_SEND_PARAM =
 801         DEFINE_MSGF("mgs_send_param", 0,
 802                     sizeof(struct mgs_send_param),
 803                     NULL, NULL);
 804 EXPORT_SYMBOL(RMF_MGS_SEND_PARAM);
 805
 806 struct req_msg_field RMF_MGS_CONFIG_BODY =
 807         DEFINE_MSGF("mgs_config_read request", 0,
 808                     sizeof(struct mgs_config_body),
 809                     lustre_swab_mgs_config_body, NULL);
 810 EXPORT_SYMBOL(RMF_MGS_CONFIG_BODY);
 811
 812 struct req_msg_field RMF_MGS_CONFIG_RES =
 813         DEFINE_MSGF("mgs_config_read reply ", 0,
 814                     sizeof(struct mgs_config_res),
 815                     lustre_swab_mgs_config_res, NULL);
 816 EXPORT_SYMBOL(RMF_MGS_CONFIG_RES);
 817
 818 struct req_msg_field RMF_U32 =
 819         DEFINE_MSGF("generic u32", 0,
 820                     sizeof(__u32), lustre_swab_generic_32s, NULL);
 821 EXPORT_SYMBOL(RMF_U32);
 822
 823 struct req_msg_field RMF_SETINFO_VAL =
 824         DEFINE_MSGF("setinfo_val", 0, -1, NULL, NULL);
 825 EXPORT_SYMBOL(RMF_SETINFO_VAL);
 826
 827 struct req_msg_field RMF_GETINFO_KEY =
 828         DEFINE_MSGF("getinfo_key", 0, -1, NULL, NULL);
 829 EXPORT_SYMBOL(RMF_GETINFO_KEY);
 830
 831 struct req_msg_field RMF_GETINFO_VALLEN =
 832         DEFINE_MSGF("getinfo_vallen", 0,
 833                     sizeof(__u32), lustre_swab_generic_32s, NULL);
 834 EXPORT_SYMBOL(RMF_GETINFO_VALLEN);
 835
 836 struct req_msg_field RMF_GETINFO_VAL =
 837         DEFINE_MSGF("getinfo_val", 0, -1, NULL, NULL);
 838 EXPORT_SYMBOL(RMF_GETINFO_VAL);
 839
 840 struct req_msg_field RMF_SEQ_OPC =
 841         DEFINE_MSGF("seq_query_opc", 0,
 842                     sizeof(__u32), lustre_swab_generic_32s, NULL);
 843 EXPORT_SYMBOL(RMF_SEQ_OPC);
 844
 845 struct req_msg_field RMF_SEQ_RANGE =
 846         DEFINE_MSGF("seq_query_range", 0,
 847                     sizeof(struct lu_seq_range),
 848                     lustre_swab_lu_seq_range, NULL);
 849 EXPORT_SYMBOL(RMF_SEQ_RANGE);
 850
 851 struct req_msg_field RMF_FLD_OPC =
 852         DEFINE_MSGF("fld_query_opc", 0,
 853                     sizeof(__u32), lustre_swab_generic_32s, NULL);
 854 EXPORT_SYMBOL(RMF_FLD_OPC);
 855
 856 struct req_msg_field RMF_FLD_MDFLD =
 857         DEFINE_MSGF("fld_query_mdfld", 0,
 858                     sizeof(struct lu_seq_range),
 859                     lustre_swab_lu_seq_range, NULL);
 860 EXPORT_SYMBOL(RMF_FLD_MDFLD);
 861
 862 struct req_msg_field RMF_MDT_BODY =
 863         DEFINE_MSGF("mdt_body", 0,
 864                     sizeof(struct mdt_body), lustre_swab_mdt_body, NULL);
 865 EXPORT_SYMBOL(RMF_MDT_BODY);
 866
 867 struct req_msg_field RMF_OBD_QUOTACTL =
 868         DEFINE_MSGF("obd_quotactl", 0,
 869                     sizeof(struct obd_quotactl),
 870                     lustre_swab_obd_quotactl, NULL);
 871 EXPORT_SYMBOL(RMF_OBD_QUOTACTL);
 872
 873 struct req_msg_field RMF_MDT_EPOCH =
 874         DEFINE_MSGF("mdt_ioepoch", 0,
 875                     sizeof(struct mdt_ioepoch), lustre_swab_mdt_ioepoch, NULL);
 876 EXPORT_SYMBOL(RMF_MDT_EPOCH);
 877
 878 struct req_msg_field RMF_PTLRPC_BODY =
 879         DEFINE_MSGF("ptlrpc_body", 0,
 880                     sizeof(struct ptlrpc_body), lustre_swab_ptlrpc_body, NULL);
 881 EXPORT_SYMBOL(RMF_PTLRPC_BODY);
 882
 883 struct req_msg_field RMF_CLOSE_DATA =
 884         DEFINE_MSGF("data_version", 0,
 885                     sizeof(struct close_data), lustre_swab_close_data, NULL);
 886 EXPORT_SYMBOL(RMF_CLOSE_DATA);
 887
 888 struct req_msg_field RMF_OBD_STATFS =
 889         DEFINE_MSGF("obd_statfs", 0,
 890                     sizeof(struct obd_statfs), lustre_swab_obd_statfs, NULL);
 891 EXPORT_SYMBOL(RMF_OBD_STATFS);
 892
 893 struct req_msg_field RMF_SETINFO_KEY =
 894         DEFINE_MSGF("setinfo_key", 0, -1, NULL, NULL);
 895 EXPORT_SYMBOL(RMF_SETINFO_KEY);
 896
 897 struct req_msg_field RMF_NAME =
 898         DEFINE_MSGF("name", RMF_F_STRING, -1, NULL, NULL);
 899 EXPORT_SYMBOL(RMF_NAME);
 900
 901 struct req_msg_field RMF_SYMTGT =
 902         DEFINE_MSGF("symtgt", RMF_F_STRING, -1, NULL, NULL);
 903 EXPORT_SYMBOL(RMF_SYMTGT);
 904
 905 struct req_msg_field RMF_TGTUUID =
 906         DEFINE_MSGF("tgtuuid", RMF_F_STRING, sizeof(struct obd_uuid) - 1, NULL,
 907                     NULL);
 908 EXPORT_SYMBOL(RMF_TGTUUID);
 909
 910 struct req_msg_field RMF_CLUUID =
 911         DEFINE_MSGF("cluuid", RMF_F_STRING, sizeof(struct obd_uuid) - 1, NULL,
 912                     NULL);
 913 EXPORT_SYMBOL(RMF_CLUUID);
 914
 915 struct req_msg_field RMF_STRING =
 916         DEFINE_MSGF("string", RMF_F_STRING, -1, NULL, NULL);
 917 EXPORT_SYMBOL(RMF_STRING);
 918
 919 struct req_msg_field RMF_LLOGD_BODY =
 920         DEFINE_MSGF("llogd_body", 0,
 921                     sizeof(struct llogd_body), lustre_swab_llogd_body, NULL);
 922 EXPORT_SYMBOL(RMF_LLOGD_BODY);
 923
 924 struct req_msg_field RMF_LLOG_LOG_HDR =
 925         DEFINE_MSGF("llog_log_hdr", 0,
 926                     sizeof(struct llog_log_hdr), lustre_swab_llog_hdr, NULL);
 927 EXPORT_SYMBOL(RMF_LLOG_LOG_HDR);
 928
 929 struct req_msg_field RMF_LLOGD_CONN_BODY =
 930         DEFINE_MSGF("llogd_conn_body", 0,
 931                     sizeof(struct llogd_conn_body),
 932                     lustre_swab_llogd_conn_body, NULL);
 933 EXPORT_SYMBOL(RMF_LLOGD_CONN_BODY);
 934
 935 /*
 936  * connection handle received in MDS_CONNECT request.
 937  *
 938  * No swabbing needed because struct lustre_handle contains only a 64-bit cookie
 939  * that the client does not interpret at all.
 940  */
 941 struct req_msg_field RMF_CONN =
 942         DEFINE_MSGF("conn", 0, sizeof(struct lustre_handle), NULL, NULL);
 943 EXPORT_SYMBOL(RMF_CONN);
 944
 945 struct req_msg_field RMF_CONNECT_DATA =
 946         DEFINE_MSGF("cdata",
 947                     RMF_F_NO_SIZE_CHECK /* we allow extra space for interop */,
 948                     sizeof(struct obd_connect_data),
 949                     lustre_swab_connect, NULL);
 950 EXPORT_SYMBOL(RMF_CONNECT_DATA);
 951
 952 struct req_msg_field RMF_DLM_REQ =
 953         DEFINE_MSGF("dlm_req", RMF_F_NO_SIZE_CHECK /* ldlm_request_bufsize */,
 954                     sizeof(struct ldlm_request),
 955                     lustre_swab_ldlm_request, NULL);
 956 EXPORT_SYMBOL(RMF_DLM_REQ);
 957
 958 struct req_msg_field RMF_DLM_REP =
 959         DEFINE_MSGF("dlm_rep", 0,
 960                     sizeof(struct ldlm_reply), lustre_swab_ldlm_reply, NULL);
 961 EXPORT_SYMBOL(RMF_DLM_REP);
 962
 963 struct req_msg_field RMF_LDLM_INTENT =
 964         DEFINE_MSGF("ldlm_intent", 0,
 965                     sizeof(struct ldlm_intent), lustre_swab_ldlm_intent, NULL);
 966 EXPORT_SYMBOL(RMF_LDLM_INTENT);
 967
 968 struct req_msg_field RMF_DLM_LVB =
 969         DEFINE_MSGF("dlm_lvb", 0, -1, NULL, NULL);
 970 EXPORT_SYMBOL(RMF_DLM_LVB);
 971
 972 struct req_msg_field RMF_DLM_GL_DESC =
 973         DEFINE_MSGF("dlm_gl_desc", 0, sizeof(union ldlm_gl_desc),
 974                     lustre_swab_gl_desc, NULL);
 975 EXPORT_SYMBOL(RMF_DLM_GL_DESC);
 976
 977 struct req_msg_field RMF_MDT_MD =
 978         DEFINE_MSGF("mdt_md", RMF_F_NO_SIZE_CHECK, MIN_MD_SIZE, NULL, NULL);
 979 EXPORT_SYMBOL(RMF_MDT_MD);
 980
 981 struct req_msg_field RMF_REC_REINT =
 982         DEFINE_MSGF("rec_reint", 0, sizeof(struct mdt_rec_reint),
 983                     lustre_swab_mdt_rec_reint, NULL);
 984 EXPORT_SYMBOL(RMF_REC_REINT);
 985
 986 /* FIXME: this length should be defined as a macro */
 987 struct req_msg_field RMF_EADATA = DEFINE_MSGF("eadata", 0, -1,
 988                                                     NULL, NULL);
 989 EXPORT_SYMBOL(RMF_EADATA);
 990
 991 struct req_msg_field RMF_EAVALS = DEFINE_MSGF("eavals", 0, -1, NULL, NULL);
 992 EXPORT_SYMBOL(RMF_EAVALS);
 993
 994 struct req_msg_field RMF_ACL =
 995         DEFINE_MSGF("acl", RMF_F_NO_SIZE_CHECK,
 996                     LUSTRE_POSIX_ACL_MAX_SIZE, NULL, NULL);
 997 EXPORT_SYMBOL(RMF_ACL);
 998
 999 /* FIXME: this should be made to use RMF_F_STRUCT_ARRAY */
1000 struct req_msg_field RMF_LOGCOOKIES =
1001         DEFINE_MSGF("logcookies", RMF_F_NO_SIZE_CHECK /* multiple cookies */,
1002                     sizeof(struct llog_cookie), NULL, NULL);
1003 EXPORT_SYMBOL(RMF_LOGCOOKIES);
1004
1005 struct req_msg_field RMF_CAPA1 =
1006         DEFINE_MSGF("capa", 0, sizeof(struct lustre_capa),
1007                     lustre_swab_lustre_capa, NULL);
1008 EXPORT_SYMBOL(RMF_CAPA1);
1009
1010 struct req_msg_field RMF_CAPA2 =
1011         DEFINE_MSGF("capa", 0, sizeof(struct lustre_capa),
1012                     lustre_swab_lustre_capa, NULL);
1013 EXPORT_SYMBOL(RMF_CAPA2);
1014
1015 struct req_msg_field RMF_LAYOUT_INTENT =
1016         DEFINE_MSGF("layout_intent", 0,
1017                     sizeof(struct layout_intent), lustre_swab_layout_intent,
1018                     NULL);
1019 EXPORT_SYMBOL(RMF_LAYOUT_INTENT);
1020
1021 /*
1022  * OST request field.
1023  */
1024 struct req_msg_field RMF_OST_BODY =
1025         DEFINE_MSGF("ost_body", 0,
1026                     sizeof(struct ost_body), lustre_swab_ost_body, dump_ost_body);
1027 EXPORT_SYMBOL(RMF_OST_BODY);
1028
1029 struct req_msg_field RMF_OBD_IOOBJ =
1030         DEFINE_MSGF("obd_ioobj", RMF_F_STRUCT_ARRAY,
1031                     sizeof(struct obd_ioobj), lustre_swab_obd_ioobj, dump_ioo);
1032 EXPORT_SYMBOL(RMF_OBD_IOOBJ);
1033
1034 struct req_msg_field RMF_NIOBUF_REMOTE =
1035         DEFINE_MSGF("niobuf_remote", RMF_F_STRUCT_ARRAY,
1036                     sizeof(struct niobuf_remote), lustre_swab_niobuf_remote,
1037                     dump_rniobuf);
1038 EXPORT_SYMBOL(RMF_NIOBUF_REMOTE);
1039
1040 struct req_msg_field RMF_RCS =
1041         DEFINE_MSGF("niobuf_remote", RMF_F_STRUCT_ARRAY, sizeof(__u32),
1042                     lustre_swab_generic_32s, dump_rcs);
1043 EXPORT_SYMBOL(RMF_RCS);
1044
1045 struct req_msg_field RMF_EAVALS_LENS =
1046         DEFINE_MSGF("eavals_lens", RMF_F_STRUCT_ARRAY, sizeof(__u32),
1047                     lustre_swab_generic_32s, NULL);
1048 EXPORT_SYMBOL(RMF_EAVALS_LENS);
1049
1050 struct req_msg_field RMF_OBD_ID =
1051         DEFINE_MSGF("u64", 0,
1052                     sizeof(u64), lustre_swab_ost_last_id, NULL);
1053 EXPORT_SYMBOL(RMF_OBD_ID);
1054
1055 struct req_msg_field RMF_FID =
1056         DEFINE_MSGF("fid", 0,
1057                     sizeof(struct lu_fid), lustre_swab_lu_fid, NULL);
1058 EXPORT_SYMBOL(RMF_FID);
1059
1060 struct req_msg_field RMF_OST_ID =
1061         DEFINE_MSGF("ost_id", 0,
1062                     sizeof(struct ost_id), lustre_swab_ost_id, NULL);
1063 EXPORT_SYMBOL(RMF_OST_ID);
1064
1065 struct req_msg_field RMF_FIEMAP_KEY =
1066         DEFINE_MSGF("fiemap", 0, sizeof(struct ll_fiemap_info_key),
1067                     lustre_swab_fiemap, NULL);
1068 EXPORT_SYMBOL(RMF_FIEMAP_KEY);
1069
1070 struct req_msg_field RMF_FIEMAP_VAL =
1071         DEFINE_MSGF("fiemap", 0, -1, lustre_swab_fiemap, NULL);
1072 EXPORT_SYMBOL(RMF_FIEMAP_VAL);
1073
1074 struct req_msg_field RMF_HSM_USER_STATE =
1075         DEFINE_MSGF("hsm_user_state", 0, sizeof(struct hsm_user_state),
1076                     lustre_swab_hsm_user_state, NULL);
1077 EXPORT_SYMBOL(RMF_HSM_USER_STATE);
1078
1079 struct req_msg_field RMF_HSM_STATE_SET =
1080         DEFINE_MSGF("hsm_state_set", 0, sizeof(struct hsm_state_set),
1081                     lustre_swab_hsm_state_set, NULL);
1082 EXPORT_SYMBOL(RMF_HSM_STATE_SET);
1083
1084 struct req_msg_field RMF_MDS_HSM_PROGRESS =
1085         DEFINE_MSGF("hsm_progress", 0, sizeof(struct hsm_progress_kernel),
1086                     lustre_swab_hsm_progress_kernel, NULL);
1087 EXPORT_SYMBOL(RMF_MDS_HSM_PROGRESS);
1088
1089 struct req_msg_field RMF_MDS_HSM_CURRENT_ACTION =
1090         DEFINE_MSGF("hsm_current_action", 0, sizeof(struct hsm_current_action),
1091                     lustre_swab_hsm_current_action, NULL);
1092 EXPORT_SYMBOL(RMF_MDS_HSM_CURRENT_ACTION);
1093
1094 struct req_msg_field RMF_MDS_HSM_USER_ITEM =
1095         DEFINE_MSGF("hsm_user_item", RMF_F_STRUCT_ARRAY,
1096                     sizeof(struct hsm_user_item), lustre_swab_hsm_user_item,
1097                     NULL);
1098 EXPORT_SYMBOL(RMF_MDS_HSM_USER_ITEM);
1099
1100 struct req_msg_field RMF_MDS_HSM_ARCHIVE =
1101         DEFINE_MSGF("hsm_archive", 0,
1102                     sizeof(__u32), lustre_swab_generic_32s, NULL);
1103 EXPORT_SYMBOL(RMF_MDS_HSM_ARCHIVE);
1104
1105 struct req_msg_field RMF_MDS_HSM_REQUEST =
1106         DEFINE_MSGF("hsm_request", 0, sizeof(struct hsm_request),
1107                     lustre_swab_hsm_request, NULL);
1108 EXPORT_SYMBOL(RMF_MDS_HSM_REQUEST);
1109
1110 struct req_msg_field RMF_SWAP_LAYOUTS =
1111         DEFINE_MSGF("swap_layouts", 0, sizeof(struct  mdc_swap_layouts),
1112                     lustre_swab_swap_layouts, NULL);
1113 EXPORT_SYMBOL(RMF_SWAP_LAYOUTS);
1114 /*
1115  * Request formats.
1116  */
1117
1118 struct req_format {
1119         const char *rf_name;
1120         size_t rf_idx;
1121         struct {
1122                 size_t nr;
1123                 const struct req_msg_field **d;
1124         } rf_fields[RCL_NR];
1125 };
1126
1127 #define DEFINE_REQ_FMT(name, client, client_nr, server, server_nr) {    \
1128         .rf_name = name,                                                \
1129         .rf_fields = {                                                  \
1130                 [RCL_CLIENT] = {                                        \
1131                         .nr = client_nr,                                \
1132                         .d = client                                     \
1133                 },                                                      \
1134                 [RCL_SERVER] = {                                        \
1135                         .nr = server_nr,                                \
1136                         .d = server                                     \
1137                 }                                                       \
1138         }                                                               \
1139 }
1140
1141 #define DEFINE_REQ_FMT0(name, client, server)                             \
1142 DEFINE_REQ_FMT(name, client, ARRAY_SIZE(client), server, ARRAY_SIZE(server))
1143
1144 struct req_format RQF_OBD_PING =
1145         DEFINE_REQ_FMT0("OBD_PING", empty, empty);
1146 EXPORT_SYMBOL(RQF_OBD_PING);
1147
1148 struct req_format RQF_OBD_SET_INFO =
1149         DEFINE_REQ_FMT0("OBD_SET_INFO", obd_set_info_client, empty);
1150 EXPORT_SYMBOL(RQF_OBD_SET_INFO);
1151
1152 struct req_format RQF_SEC_CTX =
1153         DEFINE_REQ_FMT0("SEC_CTX", empty, empty);
1154 EXPORT_SYMBOL(RQF_SEC_CTX);
1155
1156 struct req_format RQF_MGS_TARGET_REG =
1157         DEFINE_REQ_FMT0("MGS_TARGET_REG", mgs_target_info_only,
1158                         mgs_target_info_only);
1159 EXPORT_SYMBOL(RQF_MGS_TARGET_REG);
1160
1161 struct req_format RQF_MGS_SET_INFO =
1162         DEFINE_REQ_FMT0("MGS_SET_INFO", mgs_set_info,
1163                         mgs_set_info);
1164 EXPORT_SYMBOL(RQF_MGS_SET_INFO);
1165
1166 struct req_format RQF_MGS_CONFIG_READ =
1167         DEFINE_REQ_FMT0("MGS_CONFIG_READ", mgs_config_read_client,
1168                         mgs_config_read_server);
1169 EXPORT_SYMBOL(RQF_MGS_CONFIG_READ);
1170
1171 struct req_format RQF_SEQ_QUERY =
1172         DEFINE_REQ_FMT0("SEQ_QUERY", seq_query_client, seq_query_server);
1173 EXPORT_SYMBOL(RQF_SEQ_QUERY);
1174
1175 struct req_format RQF_FLD_QUERY =
1176         DEFINE_REQ_FMT0("FLD_QUERY", fld_query_client, fld_query_server);
1177 EXPORT_SYMBOL(RQF_FLD_QUERY);
1178
1179 /*
1180  * The 'fld_read_server' uses 'RMF_GENERIC_DATA' to hold the 'FLD_QUERY'
1181  * RPC reply that is composed of 'struct lu_seq_range_array'. But there
1182  * is not registered swabber function for 'RMF_GENERIC_DATA'. So the RPC
1183  * peers need to handle the RPC reply with fixed little-endian format.
1184  *
1185  * In theory, we can define new structure with some swabber registered to
1186  * handle the 'FLD_QUERY' RPC reply result automatically. But from the
1187  * implementation view, it is not easy to be done within current "struct
1188  * req_msg_field" framework. Because the sequence range array in the RPC
1189  * reply is not fixed length, instead, its length depends on 'lu_seq_range'
1190  * count, that is unknown when prepare the RPC buffer. Generally, for such
1191  * flexible length RPC usage, there will be a field in the RPC layout to
1192  * indicate the data length. But for the 'FLD_READ' RPC, we have no way to
1193  * do that unless we add new length filed that will broken the on-wire RPC
1194  * protocol and cause interoperability trouble with old peer.
1195  */
1196 struct req_format RQF_FLD_READ =
1197         DEFINE_REQ_FMT0("FLD_READ", fld_read_client, fld_read_server);
1198 EXPORT_SYMBOL(RQF_FLD_READ);
1199
1200 struct req_format RQF_LOG_CANCEL =
1201         DEFINE_REQ_FMT0("OBD_LOG_CANCEL", log_cancel_client, empty);
1202 EXPORT_SYMBOL(RQF_LOG_CANCEL);
1203
1204 struct req_format RQF_MDS_QUOTACTL =
1205         DEFINE_REQ_FMT0("MDS_QUOTACTL", quotactl_only, quotactl_only);
1206 EXPORT_SYMBOL(RQF_MDS_QUOTACTL);
1207
1208 struct req_format RQF_OST_QUOTACTL =
1209         DEFINE_REQ_FMT0("OST_QUOTACTL", quotactl_only, quotactl_only);
1210 EXPORT_SYMBOL(RQF_OST_QUOTACTL);
1211
1212 struct req_format RQF_MDS_GETSTATUS =
1213         DEFINE_REQ_FMT0("MDS_GETSTATUS", mdt_body_only, mdt_body_capa);
1214 EXPORT_SYMBOL(RQF_MDS_GETSTATUS);
1215
1216 struct req_format RQF_MDS_STATFS =
1217         DEFINE_REQ_FMT0("MDS_STATFS", empty, obd_statfs_server);
1218 EXPORT_SYMBOL(RQF_MDS_STATFS);
1219
1220 struct req_format RQF_MDS_SYNC =
1221         DEFINE_REQ_FMT0("MDS_SYNC", mdt_body_capa, mdt_body_only);
1222 EXPORT_SYMBOL(RQF_MDS_SYNC);
1223
1224 struct req_format RQF_MDS_GETATTR =
1225         DEFINE_REQ_FMT0("MDS_GETATTR", mdt_body_capa, mds_getattr_server);
1226 EXPORT_SYMBOL(RQF_MDS_GETATTR);
1227
1228 struct req_format RQF_MDS_GETXATTR =
1229         DEFINE_REQ_FMT0("MDS_GETXATTR",
1230                         mds_getxattr_client, mds_getxattr_server);
1231 EXPORT_SYMBOL(RQF_MDS_GETXATTR);
1232
1233 struct req_format RQF_MDS_GETATTR_NAME =
1234         DEFINE_REQ_FMT0("MDS_GETATTR_NAME",
1235                         mds_getattr_name_client, mds_getattr_server);
1236 EXPORT_SYMBOL(RQF_MDS_GETATTR_NAME);
1237
1238 struct req_format RQF_MDS_REINT =
1239         DEFINE_REQ_FMT0("MDS_REINT", mds_reint_client, mdt_body_only);
1240 EXPORT_SYMBOL(RQF_MDS_REINT);
1241
1242 struct req_format RQF_MDS_REINT_CREATE =
1243         DEFINE_REQ_FMT0("MDS_REINT_CREATE",
1244                         mds_reint_create_client, mdt_body_capa);
1245 EXPORT_SYMBOL(RQF_MDS_REINT_CREATE);
1246
1247 struct req_format RQF_MDS_REINT_CREATE_ACL =
1248         DEFINE_REQ_FMT0("MDS_REINT_CREATE_ACL",
1249                         mds_reint_create_acl_client, mdt_body_capa);
1250 EXPORT_SYMBOL(RQF_MDS_REINT_CREATE_ACL);
1251
1252 struct req_format RQF_MDS_REINT_CREATE_SLAVE =
1253         DEFINE_REQ_FMT0("MDS_REINT_CREATE_EA",
1254                         mds_reint_create_slave_client, mdt_body_capa);
1255 EXPORT_SYMBOL(RQF_MDS_REINT_CREATE_SLAVE);
1256
1257 struct req_format RQF_MDS_REINT_CREATE_SYM =
1258         DEFINE_REQ_FMT0("MDS_REINT_CREATE_SYM",
1259                         mds_reint_create_sym_client, mdt_body_capa);
1260 EXPORT_SYMBOL(RQF_MDS_REINT_CREATE_SYM);
1261
1262 struct req_format RQF_MDS_REINT_OPEN =
1263         DEFINE_REQ_FMT0("MDS_REINT_OPEN",
1264                         mds_reint_open_client, mds_reint_open_server);
1265 EXPORT_SYMBOL(RQF_MDS_REINT_OPEN);
1266
1267 struct req_format RQF_MDS_REINT_UNLINK =
1268         DEFINE_REQ_FMT0("MDS_REINT_UNLINK", mds_reint_unlink_client,
1269                         mds_last_unlink_server);
1270 EXPORT_SYMBOL(RQF_MDS_REINT_UNLINK);
1271
1272 struct req_format RQF_MDS_REINT_LINK =
1273         DEFINE_REQ_FMT0("MDS_REINT_LINK",
1274                         mds_reint_link_client, mdt_body_only);
1275 EXPORT_SYMBOL(RQF_MDS_REINT_LINK);
1276
1277 struct req_format RQF_MDS_REINT_RENAME =
1278         DEFINE_REQ_FMT0("MDS_REINT_RENAME", mds_reint_rename_client,
1279                         mds_last_unlink_server);
1280 EXPORT_SYMBOL(RQF_MDS_REINT_RENAME);
1281
1282 struct req_format RQF_MDS_REINT_MIGRATE =
1283         DEFINE_REQ_FMT0("MDS_REINT_MIGRATE", mds_reint_migrate_client,
1284                         mds_last_unlink_server);
1285 EXPORT_SYMBOL(RQF_MDS_REINT_MIGRATE);
1286
1287 struct req_format RQF_MDS_REINT_SETATTR =
1288         DEFINE_REQ_FMT0("MDS_REINT_SETATTR",
1289                         mds_reint_setattr_client, mds_setattr_server);
1290 EXPORT_SYMBOL(RQF_MDS_REINT_SETATTR);
1291
1292 struct req_format RQF_MDS_REINT_SETXATTR =
1293         DEFINE_REQ_FMT0("MDS_REINT_SETXATTR",
1294                         mds_reint_setxattr_client, mdt_body_only);
1295 EXPORT_SYMBOL(RQF_MDS_REINT_SETXATTR);
1296
1297 struct req_format RQF_MDS_CONNECT =
1298         DEFINE_REQ_FMT0("MDS_CONNECT",
1299                         obd_connect_client, obd_connect_server);
1300 EXPORT_SYMBOL(RQF_MDS_CONNECT);
1301
1302 struct req_format RQF_MDS_DISCONNECT =
1303         DEFINE_REQ_FMT0("MDS_DISCONNECT", empty, empty);
1304 EXPORT_SYMBOL(RQF_MDS_DISCONNECT);
1305
1306 struct req_format RQF_MDS_GET_INFO =
1307         DEFINE_REQ_FMT0("MDS_GET_INFO", mds_getinfo_client,
1308                         mds_getinfo_server);
1309 EXPORT_SYMBOL(RQF_MDS_GET_INFO);
1310
1311 struct req_format RQF_LDLM_ENQUEUE =
1312         DEFINE_REQ_FMT0("LDLM_ENQUEUE",
1313                         ldlm_enqueue_client, ldlm_enqueue_lvb_server);
1314 EXPORT_SYMBOL(RQF_LDLM_ENQUEUE);
1315
1316 struct req_format RQF_LDLM_ENQUEUE_LVB =
1317         DEFINE_REQ_FMT0("LDLM_ENQUEUE_LVB",
1318                         ldlm_enqueue_client, ldlm_enqueue_lvb_server);
1319 EXPORT_SYMBOL(RQF_LDLM_ENQUEUE_LVB);
1320
1321 struct req_format RQF_LDLM_CONVERT =
1322         DEFINE_REQ_FMT0("LDLM_CONVERT",
1323                         ldlm_enqueue_client, ldlm_enqueue_server);
1324 EXPORT_SYMBOL(RQF_LDLM_CONVERT);
1325
1326 struct req_format RQF_LDLM_CANCEL =
1327         DEFINE_REQ_FMT0("LDLM_CANCEL", ldlm_enqueue_client, empty);
1328 EXPORT_SYMBOL(RQF_LDLM_CANCEL);
1329
1330 struct req_format RQF_LDLM_CALLBACK =
1331         DEFINE_REQ_FMT0("LDLM_CALLBACK", ldlm_enqueue_client, empty);
1332 EXPORT_SYMBOL(RQF_LDLM_CALLBACK);
1333
1334 struct req_format RQF_LDLM_CP_CALLBACK =
1335         DEFINE_REQ_FMT0("LDLM_CP_CALLBACK", ldlm_cp_callback_client, empty);
1336 EXPORT_SYMBOL(RQF_LDLM_CP_CALLBACK);
1337
1338 struct req_format RQF_LDLM_BL_CALLBACK =
1339         DEFINE_REQ_FMT0("LDLM_BL_CALLBACK", ldlm_enqueue_client, empty);
1340 EXPORT_SYMBOL(RQF_LDLM_BL_CALLBACK);
1341
1342 struct req_format RQF_LDLM_GL_CALLBACK =
1343         DEFINE_REQ_FMT0("LDLM_GL_CALLBACK", ldlm_enqueue_client,
1344                         ldlm_gl_callback_server);
1345 EXPORT_SYMBOL(RQF_LDLM_GL_CALLBACK);
1346
1347 struct req_format RQF_LDLM_GL_DESC_CALLBACK =
1348         DEFINE_REQ_FMT0("LDLM_GL_CALLBACK", ldlm_gl_callback_desc_client,
1349                         ldlm_gl_callback_server);
1350 EXPORT_SYMBOL(RQF_LDLM_GL_DESC_CALLBACK);
1351
1352 struct req_format RQF_LDLM_INTENT_BASIC =
1353         DEFINE_REQ_FMT0("LDLM_INTENT_BASIC",
1354                         ldlm_intent_basic_client, ldlm_enqueue_lvb_server);
1355 EXPORT_SYMBOL(RQF_LDLM_INTENT_BASIC);
1356
1357 struct req_format RQF_LDLM_INTENT =
1358         DEFINE_REQ_FMT0("LDLM_INTENT",
1359                         ldlm_intent_client, ldlm_intent_server);
1360 EXPORT_SYMBOL(RQF_LDLM_INTENT);
1361
1362 struct req_format RQF_LDLM_INTENT_LAYOUT =
1363         DEFINE_REQ_FMT0("LDLM_INTENT_LAYOUT ",
1364                         ldlm_intent_layout_client, ldlm_enqueue_lvb_server);
1365 EXPORT_SYMBOL(RQF_LDLM_INTENT_LAYOUT);
1366
1367 struct req_format RQF_LDLM_INTENT_GETATTR =
1368         DEFINE_REQ_FMT0("LDLM_INTENT_GETATTR",
1369                         ldlm_intent_getattr_client, ldlm_intent_getattr_server);
1370 EXPORT_SYMBOL(RQF_LDLM_INTENT_GETATTR);
1371
1372 struct req_format RQF_LDLM_INTENT_OPEN =
1373         DEFINE_REQ_FMT0("LDLM_INTENT_OPEN",
1374                         ldlm_intent_open_client, ldlm_intent_open_server);
1375 EXPORT_SYMBOL(RQF_LDLM_INTENT_OPEN);
1376
1377 struct req_format RQF_LDLM_INTENT_CREATE =
1378         DEFINE_REQ_FMT0("LDLM_INTENT_CREATE",
1379                         ldlm_intent_create_client, ldlm_intent_getattr_server);
1380 EXPORT_SYMBOL(RQF_LDLM_INTENT_CREATE);
1381
1382 struct req_format RQF_LDLM_INTENT_UNLINK =
1383         DEFINE_REQ_FMT0("LDLM_INTENT_UNLINK",
1384                         ldlm_intent_unlink_client, ldlm_intent_server);
1385 EXPORT_SYMBOL(RQF_LDLM_INTENT_UNLINK);
1386
1387 struct req_format RQF_LDLM_INTENT_GETXATTR =
1388         DEFINE_REQ_FMT0("LDLM_INTENT_GETXATTR",
1389                         ldlm_intent_getxattr_client,
1390                         ldlm_intent_getxattr_server);
1391 EXPORT_SYMBOL(RQF_LDLM_INTENT_GETXATTR);
1392
1393 struct req_format RQF_MDS_CLOSE =
1394         DEFINE_REQ_FMT0("MDS_CLOSE",
1395                         mdt_close_client, mds_last_unlink_server);
1396 EXPORT_SYMBOL(RQF_MDS_CLOSE);
1397
1398 struct req_format RQF_MDS_INTENT_CLOSE =
1399         DEFINE_REQ_FMT0("MDS_CLOSE",
1400                         mdt_intent_close_client, mds_last_unlink_server);
1401 EXPORT_SYMBOL(RQF_MDS_INTENT_CLOSE);
1402
1403 struct req_format RQF_MDS_READPAGE =
1404         DEFINE_REQ_FMT0("MDS_READPAGE",
1405                         mdt_body_capa, mdt_body_only);
1406 EXPORT_SYMBOL(RQF_MDS_READPAGE);
1407
1408 struct req_format RQF_MDS_HSM_ACTION =
1409         DEFINE_REQ_FMT0("MDS_HSM_ACTION", mdt_body_capa, mdt_hsm_action_server);
1410 EXPORT_SYMBOL(RQF_MDS_HSM_ACTION);
1411
1412 struct req_format RQF_MDS_HSM_PROGRESS =
1413         DEFINE_REQ_FMT0("MDS_HSM_PROGRESS", mdt_hsm_progress, empty);
1414 EXPORT_SYMBOL(RQF_MDS_HSM_PROGRESS);
1415
1416 struct req_format RQF_MDS_HSM_CT_REGISTER =
1417         DEFINE_REQ_FMT0("MDS_HSM_CT_REGISTER", mdt_hsm_ct_register, empty);
1418 EXPORT_SYMBOL(RQF_MDS_HSM_CT_REGISTER);
1419
1420 struct req_format RQF_MDS_HSM_CT_UNREGISTER =
1421         DEFINE_REQ_FMT0("MDS_HSM_CT_UNREGISTER", mdt_hsm_ct_unregister, empty);
1422 EXPORT_SYMBOL(RQF_MDS_HSM_CT_UNREGISTER);
1423
1424 struct req_format RQF_MDS_HSM_STATE_GET =
1425         DEFINE_REQ_FMT0("MDS_HSM_STATE_GET",
1426                         mdt_body_capa, mdt_hsm_state_get_server);
1427 EXPORT_SYMBOL(RQF_MDS_HSM_STATE_GET);
1428
1429 struct req_format RQF_MDS_HSM_STATE_SET =
1430         DEFINE_REQ_FMT0("MDS_HSM_STATE_SET", mdt_hsm_state_set, empty);
1431 EXPORT_SYMBOL(RQF_MDS_HSM_STATE_SET);
1432
1433 struct req_format RQF_MDS_HSM_REQUEST =
1434         DEFINE_REQ_FMT0("MDS_HSM_REQUEST", mdt_hsm_request, empty);
1435 EXPORT_SYMBOL(RQF_MDS_HSM_REQUEST);
1436
1437 struct req_format RQF_MDS_SWAP_LAYOUTS =
1438         DEFINE_REQ_FMT0("MDS_SWAP_LAYOUTS",
1439                         mdt_swap_layouts, empty);
1440 EXPORT_SYMBOL(RQF_MDS_SWAP_LAYOUTS);
1441
1442 /* This is for split */
1443 struct req_format RQF_MDS_WRITEPAGE =
1444         DEFINE_REQ_FMT0("MDS_WRITEPAGE",
1445                         mdt_body_capa, mdt_body_only);
1446 EXPORT_SYMBOL(RQF_MDS_WRITEPAGE);
1447
1448 struct req_format RQF_LLOG_ORIGIN_HANDLE_CREATE =
1449         DEFINE_REQ_FMT0("LLOG_ORIGIN_HANDLE_CREATE",
1450                         llog_origin_handle_create_client, llogd_body_only);
1451 EXPORT_SYMBOL(RQF_LLOG_ORIGIN_HANDLE_CREATE);
1452
1453 struct req_format RQF_LLOG_ORIGIN_HANDLE_DESTROY =
1454         DEFINE_REQ_FMT0("LLOG_ORIGIN_HANDLE_DESTROY",
1455                         llogd_body_only, llogd_body_only);
1456 EXPORT_SYMBOL(RQF_LLOG_ORIGIN_HANDLE_DESTROY);
1457
1458 struct req_format RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK =
1459         DEFINE_REQ_FMT0("LLOG_ORIGIN_HANDLE_NEXT_BLOCK",
1460                         llogd_body_only, llog_origin_handle_next_block_server);
1461 EXPORT_SYMBOL(RQF_LLOG_ORIGIN_HANDLE_NEXT_BLOCK);
1462
1463 struct req_format RQF_LLOG_ORIGIN_HANDLE_PREV_BLOCK =
1464         DEFINE_REQ_FMT0("LLOG_ORIGIN_HANDLE_PREV_BLOCK",
1465                         llogd_body_only, llog_origin_handle_next_block_server);
1466 EXPORT_SYMBOL(RQF_LLOG_ORIGIN_HANDLE_PREV_BLOCK);
1467
1468 struct req_format RQF_LLOG_ORIGIN_HANDLE_READ_HEADER =
1469         DEFINE_REQ_FMT0("LLOG_ORIGIN_HANDLE_READ_HEADER",
1470                         llogd_body_only, llog_log_hdr_only);
1471 EXPORT_SYMBOL(RQF_LLOG_ORIGIN_HANDLE_READ_HEADER);
1472
1473 struct req_format RQF_LLOG_ORIGIN_CONNECT =
1474         DEFINE_REQ_FMT0("LLOG_ORIGIN_CONNECT", llogd_conn_body_only, empty);
1475 EXPORT_SYMBOL(RQF_LLOG_ORIGIN_CONNECT);
1476
1477 struct req_format RQF_CONNECT =
1478         DEFINE_REQ_FMT0("CONNECT", obd_connect_client, obd_connect_server);
1479 EXPORT_SYMBOL(RQF_CONNECT);
1480
1481 struct req_format RQF_OST_CONNECT =
1482         DEFINE_REQ_FMT0("OST_CONNECT",
1483                         obd_connect_client, obd_connect_server);
1484 EXPORT_SYMBOL(RQF_OST_CONNECT);
1485
1486 struct req_format RQF_OST_DISCONNECT =
1487         DEFINE_REQ_FMT0("OST_DISCONNECT", empty, empty);
1488 EXPORT_SYMBOL(RQF_OST_DISCONNECT);
1489
1490 struct req_format RQF_OST_GETATTR =
1491         DEFINE_REQ_FMT0("OST_GETATTR", ost_body_capa, ost_body_only);
1492 EXPORT_SYMBOL(RQF_OST_GETATTR);
1493
1494 struct req_format RQF_OST_SETATTR =
1495         DEFINE_REQ_FMT0("OST_SETATTR", ost_body_capa, ost_body_only);
1496 EXPORT_SYMBOL(RQF_OST_SETATTR);
1497
1498 struct req_format RQF_OST_CREATE =
1499         DEFINE_REQ_FMT0("OST_CREATE", ost_body_only, ost_body_only);
1500 EXPORT_SYMBOL(RQF_OST_CREATE);
1501
1502 struct req_format RQF_OST_PUNCH =
1503         DEFINE_REQ_FMT0("OST_PUNCH", ost_body_capa, ost_body_only);
1504 EXPORT_SYMBOL(RQF_OST_PUNCH);
1505
1506 struct req_format RQF_OST_SYNC =
1507         DEFINE_REQ_FMT0("OST_SYNC", ost_body_capa, ost_body_only);
1508 EXPORT_SYMBOL(RQF_OST_SYNC);
1509
1510 struct req_format RQF_OST_DESTROY =
1511         DEFINE_REQ_FMT0("OST_DESTROY", ost_destroy_client, ost_body_only);
1512 EXPORT_SYMBOL(RQF_OST_DESTROY);
1513
1514 struct req_format RQF_OST_BRW_READ =
1515         DEFINE_REQ_FMT0("OST_BRW_READ", ost_brw_client, ost_brw_read_server);
1516 EXPORT_SYMBOL(RQF_OST_BRW_READ);
1517
1518 struct req_format RQF_OST_BRW_WRITE =
1519         DEFINE_REQ_FMT0("OST_BRW_WRITE", ost_brw_client, ost_brw_write_server);
1520 EXPORT_SYMBOL(RQF_OST_BRW_WRITE);
1521
1522 struct req_format RQF_OST_STATFS =
1523         DEFINE_REQ_FMT0("OST_STATFS", empty, obd_statfs_server);
1524 EXPORT_SYMBOL(RQF_OST_STATFS);
1525
1526 struct req_format RQF_OST_SET_GRANT_INFO =
1527         DEFINE_REQ_FMT0("OST_SET_GRANT_INFO", ost_grant_shrink_client,
1528                         ost_body_only);
1529 EXPORT_SYMBOL(RQF_OST_SET_GRANT_INFO);
1530
1531 struct req_format RQF_OST_GET_INFO =
1532         DEFINE_REQ_FMT0("OST_GET_INFO", ost_get_info_generic_client,
1533                         ost_get_info_generic_server);
1534 EXPORT_SYMBOL(RQF_OST_GET_INFO);
1535
1536 struct req_format RQF_OST_GET_INFO_LAST_ID =
1537         DEFINE_REQ_FMT0("OST_GET_INFO_LAST_ID", ost_get_info_generic_client,
1538                         ost_get_last_id_server);
1539 EXPORT_SYMBOL(RQF_OST_GET_INFO_LAST_ID);
1540
1541 struct req_format RQF_OST_GET_INFO_LAST_FID =
1542         DEFINE_REQ_FMT0("OST_GET_INFO_LAST_FID", ost_get_last_fid_client,
1543                         ost_get_last_fid_server);
1544 EXPORT_SYMBOL(RQF_OST_GET_INFO_LAST_FID);
1545
1546 struct req_format RQF_OST_SET_INFO_LAST_FID =
1547         DEFINE_REQ_FMT0("OST_SET_INFO_LAST_FID", obd_set_info_client,
1548                         empty);
1549 EXPORT_SYMBOL(RQF_OST_SET_INFO_LAST_FID);
1550
1551 struct req_format RQF_OST_GET_INFO_FIEMAP =
1552         DEFINE_REQ_FMT0("OST_GET_INFO_FIEMAP", ost_get_fiemap_client,
1553                         ost_get_fiemap_server);
1554 EXPORT_SYMBOL(RQF_OST_GET_INFO_FIEMAP);
1555
1556 /* Convenience macro */
1557 #define FMT_FIELD(fmt, i, j) (fmt)->rf_fields[(i)].d[(j)]
1558
1559 /**
1560  * Initializes the capsule abstraction by computing and setting the \a rf_idx
1561  * field of RQFs and the \a rmf_offset field of RMFs.
1562  */
1563 int req_layout_init(void)
1564 {
1565         size_t i;
1566         size_t j;
1567         size_t k;
1568         struct req_format *rf = NULL;
1569
1570         for (i = 0; i < ARRAY_SIZE(req_formats); ++i) {
1571                 rf = req_formats[i];
1572                 rf->rf_idx = i;
1573                 for (j = 0; j < RCL_NR; ++j) {
1574                         LASSERT(rf->rf_fields[j].nr <= REQ_MAX_FIELD_NR);
1575                         for (k = 0; k < rf->rf_fields[j].nr; ++k) {
1576                                 struct req_msg_field *field;
1577
1578                                 field = (typeof(field))rf->rf_fields[j].d[k];
1579                                 LASSERT(!(field->rmf_flags & RMF_F_STRUCT_ARRAY)
1580                                         || field->rmf_size > 0);
1581                                 LASSERT(field->rmf_offset[i][j] == 0);
1582                                 /*
1583                                  * k + 1 to detect unused format/field
1584                                  * combinations.
1585                                  */
1586                                 field->rmf_offset[i][j] = k + 1;
1587                         }
1588                 }
1589         }
1590         return 0;
1591 }
1592 EXPORT_SYMBOL(req_layout_init);
1593
1594 void req_layout_fini(void)
1595 {
1596 }
1597 EXPORT_SYMBOL(req_layout_fini);
1598
1599 /**
1600  * Initializes the expected sizes of each RMF in a \a pill (\a rc_area) to -1.
1601  *
1602  * Actual/expected field sizes are set elsewhere in functions in this file:
1603  * req_capsule_init(), req_capsule_server_pack(), req_capsule_set_size() and
1604  * req_capsule_msg_size().  The \a rc_area information is used by.
1605  * ptlrpc_request_set_replen().
1606  */
1607 static void req_capsule_init_area(struct req_capsule *pill)
1608 {
1609         size_t i;
1610
1611         for (i = 0; i < ARRAY_SIZE(pill->rc_area[RCL_CLIENT]); i++) {
1612                 pill->rc_area[RCL_CLIENT][i] = -1;
1613                 pill->rc_area[RCL_SERVER][i] = -1;
1614         }
1615 }
1616
1617 /**
1618  * Initialize a pill.
1619  *
1620  * The \a location indicates whether the caller is executing on the client side
1621  * (RCL_CLIENT) or server side (RCL_SERVER)..
1622  */
1623 void req_capsule_init(struct req_capsule *pill,
1624                       struct ptlrpc_request *req,
1625                       enum req_location location)
1626 {
1627         LASSERT(location == RCL_SERVER || location == RCL_CLIENT);
1628
1629         /*
1630          * Today all capsules are embedded in ptlrpc_request structs,
1631          * but just in case that ever isn't the case, we don't reach
1632          * into req unless req != NULL and pill is the one embedded in
1633          * the req.
1634          *
1635          * The req->rq_pill_init flag makes it safe to initialize a pill
1636          * twice, which might happen in the OST paths as a result of the
1637          * high-priority RPC queue getting peeked at before ost_handle()
1638          * handles an OST RPC.
1639          */
1640         if (req && pill == &req->rq_pill && req->rq_pill_init)
1641                 return;
1642
1643         memset(pill, 0, sizeof(*pill));
1644         pill->rc_req = req;
1645         pill->rc_loc = location;
1646         req_capsule_init_area(pill);
1647
1648         if (req && pill == &req->rq_pill)
1649                 req->rq_pill_init = 1;
1650 }
1651 EXPORT_SYMBOL(req_capsule_init);
1652
1653 void req_capsule_fini(struct req_capsule *pill)
1654 {
1655 }
1656 EXPORT_SYMBOL(req_capsule_fini);
1657
1658 static int __req_format_is_sane(const struct req_format *fmt)
1659 {
1660         return fmt->rf_idx < ARRAY_SIZE(req_formats) &&
1661                 req_formats[fmt->rf_idx] == fmt;
1662 }
1663
1664 static struct lustre_msg *__req_msg(const struct req_capsule *pill,
1665                                     enum req_location loc)
1666 {
1667         struct ptlrpc_request *req;
1668
1669         req = pill->rc_req;
1670         return loc == RCL_CLIENT ? req->rq_reqmsg : req->rq_repmsg;
1671 }
1672
1673 /**
1674  * Set the format (\a fmt) of a \a pill; format changes are not allowed here
1675  * (see req_capsule_extend()).
1676  */
1677 void req_capsule_set(struct req_capsule *pill, const struct req_format *fmt)
1678 {
1679         LASSERT(!pill->rc_fmt || pill->rc_fmt == fmt);
1680         LASSERT(__req_format_is_sane(fmt));
1681
1682         pill->rc_fmt = fmt;
1683 }
1684 EXPORT_SYMBOL(req_capsule_set);
1685
1686 /**
1687  * Fills in any parts of the \a rc_area of a \a pill that haven't been filled in
1688  * yet.
1689
1690  * \a rc_area is an array of REQ_MAX_FIELD_NR elements, used to store sizes of
1691  * variable-sized fields.  The field sizes come from the declared \a rmf_size
1692  * field of a \a pill's \a rc_fmt's RMF's.
1693  */
1694 size_t req_capsule_filled_sizes(struct req_capsule *pill,
1695                                 enum req_location loc)
1696 {
1697         const struct req_format *fmt = pill->rc_fmt;
1698         size_t i;
1699
1700         for (i = 0; i < fmt->rf_fields[loc].nr; ++i) {
1701                 if (pill->rc_area[loc][i] == -1) {
1702                         pill->rc_area[loc][i] =
1703                                             fmt->rf_fields[loc].d[i]->rmf_size;
1704                         if (pill->rc_area[loc][i] == -1) {
1705                                 /*
1706                                  * Skip the following fields.
1707                                  *
1708                                  * If this LASSERT() trips then you're missing a
1709                                  * call to req_capsule_set_size().
1710                                  */
1711                                 LASSERT(loc != RCL_SERVER);
1712                                 break;
1713                         }
1714                 }
1715         }
1716         return i;
1717 }
1718 EXPORT_SYMBOL(req_capsule_filled_sizes);
1719
1720 /**
1721  * Capsule equivalent of lustre_pack_request() and lustre_pack_reply().
1722  *
1723  * This function uses the \a pill's \a rc_area as filled in by
1724  * req_capsule_set_size() or req_capsule_filled_sizes() (the latter is called by
1725  * this function).
1726  */
1727 int req_capsule_server_pack(struct req_capsule *pill)
1728 {
1729         const struct req_format *fmt;
1730         int count;
1731         int rc;
1732
1733         LASSERT(pill->rc_loc == RCL_SERVER);
1734         fmt = pill->rc_fmt;
1735         LASSERT(fmt);
1736
1737         count = req_capsule_filled_sizes(pill, RCL_SERVER);
1738         rc = lustre_pack_reply(pill->rc_req, count,
1739                                pill->rc_area[RCL_SERVER], NULL);
1740         if (rc != 0) {
1741                 DEBUG_REQ(D_ERROR, pill->rc_req,
1742                           "Cannot pack %d fields in format `%s': ",
1743                           count, fmt->rf_name);
1744         }
1745         return rc;
1746 }
1747 EXPORT_SYMBOL(req_capsule_server_pack);
1748
1749 /**
1750  * Returns the PTLRPC request or reply (\a loc) buffer offset of a \a pill
1751  * corresponding to the given RMF (\a field).
1752  */
1753 static u32 __req_capsule_offset(const struct req_capsule *pill,
1754                                 const struct req_msg_field *field,
1755                                 enum req_location loc)
1756 {
1757         u32 offset;
1758
1759         offset = field->rmf_offset[pill->rc_fmt->rf_idx][loc];
1760         LASSERTF(offset > 0, "%s:%s, off=%d, loc=%d\n", pill->rc_fmt->rf_name,
1761                  field->rmf_name, offset, loc);
1762         offset--;
1763
1764         LASSERT(offset < REQ_MAX_FIELD_NR);
1765         return offset;
1766 }
1767
1768 /**
1769  * Helper for __req_capsule_get(); swabs value / array of values and/or dumps
1770  * them if desired.
1771  */
1772 static
1773 void
1774 swabber_dumper_helper(struct req_capsule *pill,
1775                       const struct req_msg_field *field,
1776                       enum req_location loc,
1777                       int offset,
1778                       void *value, int len, int dump, void (*swabber)(void *))
1779 {
1780         void *p;
1781         int i;
1782         int n;
1783         int do_swab;
1784         int inout = loc == RCL_CLIENT;
1785
1786         swabber = swabber ?: field->rmf_swabber;
1787
1788         if (ptlrpc_buf_need_swab(pill->rc_req, inout, offset) &&
1789             swabber && value)
1790                 do_swab = 1;
1791         else
1792                 do_swab = 0;
1793
1794         if (!field->rmf_dumper)
1795                 dump = 0;
1796
1797         if (!(field->rmf_flags & RMF_F_STRUCT_ARRAY)) {
1798                 if (dump) {
1799                         CDEBUG(D_RPCTRACE, "Dump of %sfield %s follows\n",
1800                                do_swab ? "unswabbed " : "", field->rmf_name);
1801                         field->rmf_dumper(value);
1802                 }
1803                 if (!do_swab)
1804                         return;
1805                 swabber(value);
1806                 ptlrpc_buf_set_swabbed(pill->rc_req, inout, offset);
1807                 if (dump && field->rmf_dumper) {
1808                         CDEBUG(D_RPCTRACE, "Dump of swabbed field %s follows\n",
1809                                field->rmf_name);
1810                         field->rmf_dumper(value);
1811                 }
1812
1813                 return;
1814         }
1815
1816         /*
1817          * We're swabbing an array; swabber() swabs a single array element, so
1818          * swab every element.
1819          */
1820         LASSERT((len % field->rmf_size) == 0);
1821         for (p = value, i = 0, n = len / field->rmf_size;
1822              i < n;
1823              i++, p += field->rmf_size) {
1824                 if (dump) {
1825                         CDEBUG(D_RPCTRACE, "Dump of %sarray field %s, element %d follows\n",
1826                                do_swab ? "unswabbed " : "", field->rmf_name, i);
1827                         field->rmf_dumper(p);
1828                 }
1829                 if (!do_swab)
1830                         continue;
1831                 swabber(p);
1832                 if (dump) {
1833                         CDEBUG(D_RPCTRACE, "Dump of swabbed array field %s, element %d follows\n",
1834                                field->rmf_name, i);
1835                         field->rmf_dumper(value);
1836                 }
1837         }
1838         if (do_swab)
1839                 ptlrpc_buf_set_swabbed(pill->rc_req, inout, offset);
1840 }
1841
1842 /**
1843  * Returns the pointer to a PTLRPC request or reply (\a loc) buffer of a \a pill
1844  * corresponding to the given RMF (\a field).
1845  *
1846  * The buffer will be swabbed using the given \a swabber.  If \a swabber == NULL
1847  * then the \a rmf_swabber from the RMF will be used.  Soon there will be no
1848  * calls to __req_capsule_get() with a non-NULL \a swabber; \a swabber will then
1849  * be removed.  Fields with the \a RMF_F_STRUCT_ARRAY flag set will have each
1850  * element of the array swabbed.
1851  */
1852 static void *__req_capsule_get(struct req_capsule *pill,
1853                                const struct req_msg_field *field,
1854                                enum req_location loc,
1855                                void (*swabber)(void *),
1856                                int dump)
1857 {
1858         const struct req_format *fmt;
1859         struct lustre_msg *msg;
1860         void *value;
1861         u32 len;
1862         u32 offset;
1863
1864         void *(*getter)(struct lustre_msg *m, u32 n, u32 minlen);
1865
1866         static const char *rcl_names[RCL_NR] = {
1867                 [RCL_CLIENT] = "client",
1868                 [RCL_SERVER] = "server"
1869         };
1870
1871         fmt = pill->rc_fmt;
1872         LASSERT(fmt);
1873         LASSERT(fmt != LP_POISON);
1874         LASSERT(__req_format_is_sane(fmt));
1875
1876         offset = __req_capsule_offset(pill, field, loc);
1877
1878         msg = __req_msg(pill, loc);
1879         LASSERT(msg);
1880
1881         getter = (field->rmf_flags & RMF_F_STRING) ?
1882                 (typeof(getter))lustre_msg_string : lustre_msg_buf;
1883
1884         if (field->rmf_flags & (RMF_F_STRUCT_ARRAY | RMF_F_NO_SIZE_CHECK)) {
1885                 /*
1886                  * We've already asserted that field->rmf_size > 0 in
1887                  * req_layout_init().
1888                  */
1889                 len = lustre_msg_buflen(msg, offset);
1890                 if (!(field->rmf_flags & RMF_F_NO_SIZE_CHECK) &&
1891                     (len % field->rmf_size)) {
1892                         CERROR("%s: array field size mismatch %d modulo %u != 0 (%d)\n",
1893                                field->rmf_name, len, field->rmf_size, loc);
1894                         return NULL;
1895                 }
1896         } else if (pill->rc_area[loc][offset] != -1) {
1897                 len = pill->rc_area[loc][offset];
1898         } else {
1899                 len = max_t(typeof(field->rmf_size), field->rmf_size, 0);
1900         }
1901         value = getter(msg, offset, len);
1902
1903         if (!value) {
1904                 DEBUG_REQ(D_ERROR, pill->rc_req,
1905                           "Wrong buffer for field `%s' (%u of %u) in format `%s': %u vs. %u (%s)\n",
1906                           field->rmf_name, offset, lustre_msg_bufcount(msg),
1907                           fmt->rf_name, lustre_msg_buflen(msg, offset), len,
1908                           rcl_names[loc]);
1909         } else {
1910                 swabber_dumper_helper(pill, field, loc, offset, value, len,
1911                                       dump, swabber);
1912         }
1913
1914         return value;
1915 }
1916
1917 /**
1918  * Trivial wrapper around __req_capsule_get(), that returns the PTLRPC request
1919  * buffer corresponding to the given RMF (\a field) of a \a pill.
1920  */
1921 void *req_capsule_client_get(struct req_capsule *pill,
1922                              const struct req_msg_field *field)
1923 {
1924         return __req_capsule_get(pill, field, RCL_CLIENT, NULL, 0);
1925 }
1926 EXPORT_SYMBOL(req_capsule_client_get);
1927
1928 /**
1929  * Same as req_capsule_client_get(), but with a \a swabber argument.
1930  *
1931  * Currently unused; will be removed when req_capsule_server_swab_get() is
1932  * unused too.
1933  */
1934 void *req_capsule_client_swab_get(struct req_capsule *pill,
1935                                   const struct req_msg_field *field,
1936                                   void *swabber)
1937 {
1938         return __req_capsule_get(pill, field, RCL_CLIENT, swabber, 0);
1939 }
1940 EXPORT_SYMBOL(req_capsule_client_swab_get);
1941
1942 /**
1943  * Utility that combines req_capsule_set_size() and req_capsule_client_get().
1944  *
1945  * First the \a pill's request \a field's size is set (\a rc_area) using
1946  * req_capsule_set_size() with the given \a len.  Then the actual buffer is
1947  * returned.
1948  */
1949 void *req_capsule_client_sized_get(struct req_capsule *pill,
1950                                    const struct req_msg_field *field,
1951                                    u32 len)
1952 {
1953         req_capsule_set_size(pill, field, RCL_CLIENT, len);
1954         return __req_capsule_get(pill, field, RCL_CLIENT, NULL, 0);
1955 }
1956 EXPORT_SYMBOL(req_capsule_client_sized_get);
1957
1958 /**
1959  * Trivial wrapper around __req_capsule_get(), that returns the PTLRPC reply
1960  * buffer corresponding to the given RMF (\a field) of a \a pill.
1961  */
1962 void *req_capsule_server_get(struct req_capsule *pill,
1963                              const struct req_msg_field *field)
1964 {
1965         return __req_capsule_get(pill, field, RCL_SERVER, NULL, 0);
1966 }
1967 EXPORT_SYMBOL(req_capsule_server_get);
1968
1969 /**
1970  * Same as req_capsule_server_get(), but with a \a swabber argument.
1971  *
1972  * Ideally all swabbing should be done pursuant to RMF definitions, with no
1973  * swabbing done outside this capsule abstraction.
1974  */
1975 void *req_capsule_server_swab_get(struct req_capsule *pill,
1976                                   const struct req_msg_field *field,
1977                                   void *swabber)
1978 {
1979         return __req_capsule_get(pill, field, RCL_SERVER, swabber, 0);
1980 }
1981 EXPORT_SYMBOL(req_capsule_server_swab_get);
1982
1983 /**
1984  * Utility that combines req_capsule_set_size() and req_capsule_server_get().
1985  *
1986  * First the \a pill's request \a field's size is set (\a rc_area) using
1987  * req_capsule_set_size() with the given \a len.  Then the actual buffer is
1988  * returned.
1989  */
1990 void *req_capsule_server_sized_get(struct req_capsule *pill,
1991                                    const struct req_msg_field *field,
1992                                    u32 len)
1993 {
1994         req_capsule_set_size(pill, field, RCL_SERVER, len);
1995         return __req_capsule_get(pill, field, RCL_SERVER, NULL, 0);
1996 }
1997 EXPORT_SYMBOL(req_capsule_server_sized_get);
1998
1999 void *req_capsule_server_sized_swab_get(struct req_capsule *pill,
2000                                         const struct req_msg_field *field,
2001                                         u32 len, void *swabber)
2002 {
2003         req_capsule_set_size(pill, field, RCL_SERVER, len);
2004         return __req_capsule_get(pill, field, RCL_SERVER, swabber, 0);
2005 }
2006 EXPORT_SYMBOL(req_capsule_server_sized_swab_get);
2007
2008 /**
2009  * Set the size of the PTLRPC request/reply (\a loc) buffer for the given \a
2010  * field of the given \a pill.
2011  *
2012  * This function must be used when constructing variable sized fields of a
2013  * request or reply.
2014  */
2015 void req_capsule_set_size(struct req_capsule *pill,
2016                           const struct req_msg_field *field,
2017                           enum req_location loc, u32 size)
2018 {
2019         LASSERT(loc == RCL_SERVER || loc == RCL_CLIENT);
2020
2021         if ((size != (u32)field->rmf_size) &&
2022             (field->rmf_size != -1) &&
2023             !(field->rmf_flags & RMF_F_NO_SIZE_CHECK) &&
2024             (size > 0)) {
2025                 u32 rmf_size = (u32)field->rmf_size;
2026
2027                 if ((field->rmf_flags & RMF_F_STRUCT_ARRAY) &&
2028                     (size % rmf_size != 0)) {
2029                         CERROR("%s: array field size mismatch %u %% %u != 0 (%d)\n",
2030                                field->rmf_name, size, rmf_size, loc);
2031                         LBUG();
2032                 } else if (!(field->rmf_flags & RMF_F_STRUCT_ARRAY) &&
2033                            size < rmf_size) {
2034                         CERROR("%s: field size mismatch %u != %u (%d)\n",
2035                                field->rmf_name, size, rmf_size, loc);
2036                         LBUG();
2037                 }
2038         }
2039
2040         pill->rc_area[loc][__req_capsule_offset(pill, field, loc)] = size;
2041 }
2042 EXPORT_SYMBOL(req_capsule_set_size);
2043
2044 /**
2045  * Return the actual PTLRPC buffer length of a request or reply (\a loc)
2046  * for the given \a pill's given \a field.
2047  *
2048  * NB: this function doesn't correspond with req_capsule_set_size(), which
2049  * actually sets the size in pill.rc_area[loc][offset], but this function
2050  * returns the message buflen[offset], maybe we should use another name.
2051  */
2052 u32 req_capsule_get_size(const struct req_capsule *pill,
2053                          const struct req_msg_field *field,
2054                          enum req_location loc)
2055 {
2056         LASSERT(loc == RCL_SERVER || loc == RCL_CLIENT);
2057
2058         return lustre_msg_buflen(__req_msg(pill, loc),
2059                                  __req_capsule_offset(pill, field, loc));
2060 }
2061 EXPORT_SYMBOL(req_capsule_get_size);
2062
2063 /**
2064  * Wrapper around lustre_msg_size() that returns the PTLRPC size needed for the
2065  * given \a pill's request or reply (\a loc) given the field size recorded in
2066  * the \a pill's rc_area.
2067  *
2068  * See also req_capsule_set_size().
2069  */
2070 u32 req_capsule_msg_size(struct req_capsule *pill, enum req_location loc)
2071 {
2072         return lustre_msg_size(pill->rc_req->rq_import->imp_msg_magic,
2073                                pill->rc_fmt->rf_fields[loc].nr,
2074                                pill->rc_area[loc]);
2075 }
2076
2077 /**
2078  * While req_capsule_msg_size() computes the size of a PTLRPC request or reply
2079  * (\a loc) given a \a pill's \a rc_area, this function computes the size of a
2080  * PTLRPC request or reply given only an RQF (\a fmt).
2081  *
2082  * This function should not be used for formats which contain variable size
2083  * fields.
2084  */
2085 u32 req_capsule_fmt_size(__u32 magic, const struct req_format *fmt,
2086                          enum req_location loc)
2087 {
2088         size_t i = 0;
2089         u32 size;
2090
2091         /*
2092          * This function should probably LASSERT() that fmt has no fields with
2093          * RMF_F_STRUCT_ARRAY in rmf_flags, since we can't know here how many
2094          * elements in the array there will ultimately be, but then, we could
2095          * assume that there will be at least one element, and that's just what
2096          * we do.
2097          */
2098         size = lustre_msg_hdr_size(magic, fmt->rf_fields[loc].nr);
2099         if (!size)
2100                 return size;
2101
2102         for (; i < fmt->rf_fields[loc].nr; ++i)
2103                 if (fmt->rf_fields[loc].d[i]->rmf_size != -1)
2104                         size += cfs_size_round(fmt->rf_fields[loc].d[i]->
2105                                                rmf_size);
2106         return size;
2107 }
2108
2109 /**
2110  * Changes the format of an RPC.
2111  *
2112  * The pill must already have been initialized, which means that it already has
2113  * a request format.  The new format \a fmt must be an extension of the pill's
2114  * old format.  Specifically: the new format must have as many request and reply
2115  * fields as the old one, and all fields shared by the old and new format must
2116  * be at least as large in the new format.
2117  *
2118  * The new format's fields may be of different "type" than the old format, but
2119  * only for fields that are "opaque" blobs: fields which have a) have no
2120  * \a rmf_swabber, b) \a rmf_flags == 0 or RMF_F_NO_SIZE_CHECK, and c) \a
2121  * rmf_size == -1 or \a rmf_flags == RMF_F_NO_SIZE_CHECK.  For example,
2122  * OBD_SET_INFO has a key field and an opaque value field that gets interpreted
2123  * according to the key field.  When the value, according to the key, contains a
2124  * structure (or array thereof) to be swabbed, the format should be changed to
2125  * one where the value field has \a rmf_size/rmf_flags/rmf_swabber set
2126  * accordingly.
2127  */
2128 void req_capsule_extend(struct req_capsule *pill, const struct req_format *fmt)
2129 {
2130         int i;
2131         size_t j;
2132
2133         const struct req_format *old;
2134
2135         LASSERT(pill->rc_fmt);
2136         LASSERT(__req_format_is_sane(fmt));
2137
2138         old = pill->rc_fmt;
2139         /*
2140          * Sanity checking...
2141          */
2142         for (i = 0; i < RCL_NR; ++i) {
2143                 LASSERT(fmt->rf_fields[i].nr >= old->rf_fields[i].nr);
2144                 for (j = 0; j < old->rf_fields[i].nr - 1; ++j) {
2145                         const struct req_msg_field *ofield = FMT_FIELD(old, i, j);
2146
2147                         /* "opaque" fields can be transmogrified */
2148                         if (!ofield->rmf_swabber &&
2149                             (ofield->rmf_flags & ~RMF_F_NO_SIZE_CHECK) == 0 &&
2150                             (ofield->rmf_size == -1 ||
2151                             ofield->rmf_flags == RMF_F_NO_SIZE_CHECK))
2152                                 continue;
2153                         LASSERT(FMT_FIELD(fmt, i, j) == FMT_FIELD(old, i, j));
2154                 }
2155                 /*
2156                  * Last field in old format can be shorter than in new.
2157                  */
2158                 LASSERT(FMT_FIELD(fmt, i, j)->rmf_size >=
2159                         FMT_FIELD(old, i, j)->rmf_size);
2160         }
2161
2162         pill->rc_fmt = fmt;
2163 }
2164 EXPORT_SYMBOL(req_capsule_extend);
2165
2166 /**
2167  * This function returns a non-zero value if the given \a field is present in
2168  * the format (\a rc_fmt) of \a pill's PTLRPC request or reply (\a loc), else it
2169  * returns 0.
2170  */
2171 int req_capsule_has_field(const struct req_capsule *pill,
2172                           const struct req_msg_field *field,
2173                           enum req_location loc)
2174 {
2175         LASSERT(loc == RCL_SERVER || loc == RCL_CLIENT);
2176
2177         return field->rmf_offset[pill->rc_fmt->rf_idx][loc];
2178 }
2179 EXPORT_SYMBOL(req_capsule_has_field);
2180
2181 /**
2182  * Returns a non-zero value if the given \a field is present in the given \a
2183  * pill's PTLRPC request or reply (\a loc), else it returns 0.
2184  */
2185 static int req_capsule_field_present(const struct req_capsule *pill,
2186                                      const struct req_msg_field *field,
2187                                      enum req_location loc)
2188 {
2189         u32 offset;
2190
2191         LASSERT(loc == RCL_SERVER || loc == RCL_CLIENT);
2192         LASSERT(req_capsule_has_field(pill, field, loc));
2193
2194         offset = __req_capsule_offset(pill, field, loc);
2195         return lustre_msg_bufcount(__req_msg(pill, loc)) > offset;
2196 }
2197
2198 /**
2199  * This function shrinks the size of the _buffer_ of the \a pill's PTLRPC
2200  * request or reply (\a loc).
2201  *
2202  * This is not the opposite of req_capsule_extend().
2203  */
2204 void req_capsule_shrink(struct req_capsule *pill,
2205                         const struct req_msg_field *field,
2206                         u32 newlen, enum req_location loc)
2207 {
2208         const struct req_format *fmt;
2209         struct lustre_msg *msg;
2210         u32 len;
2211         int offset;
2212
2213         fmt = pill->rc_fmt;
2214         LASSERT(fmt);
2215         LASSERT(__req_format_is_sane(fmt));
2216         LASSERT(req_capsule_has_field(pill, field, loc));
2217         LASSERT(req_capsule_field_present(pill, field, loc));
2218
2219         offset = __req_capsule_offset(pill, field, loc);
2220
2221         msg = __req_msg(pill, loc);
2222         len = lustre_msg_buflen(msg, offset);
2223         LASSERTF(newlen <= len, "%s:%s, oldlen=%u, newlen=%u\n",
2224                  fmt->rf_name, field->rmf_name, len, newlen);
2225
2226         if (loc == RCL_CLIENT)
2227                 pill->rc_req->rq_reqlen = lustre_shrink_msg(msg, offset, newlen,
2228                                                             1);
2229         else
2230                 pill->rc_req->rq_replen = lustre_shrink_msg(msg, offset, newlen,
2231                                                             1);
2232 }
2233 EXPORT_SYMBOL(req_capsule_shrink);