block/crypto.c

   1 /*
   2  * QEMU block full disk encryption
   3  *
   4  * Copyright (c) 2015-2016 Red Hat, Inc.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #include "qemu/osdep.h"
  22
  23 #include "block/block_int.h"
  24 #include "sysemu/block-backend.h"
  25 #include "crypto/block.h"
  26 #include "qapi/opts-visitor.h"
  27 #include "qapi/qapi-visit-crypto.h"
  28 #include "qapi/qmp/qdict.h"
  29 #include "qapi/qobject-input-visitor.h"
  30 #include "qapi/error.h"
  31 #include "qemu/option.h"
  32 #include "block/crypto.h"
  33
  34 typedef struct BlockCrypto BlockCrypto;
  35
  36 struct BlockCrypto {
  37     QCryptoBlock *block;
  38 };
  39
  40
  41 static int block_crypto_probe_generic(QCryptoBlockFormat format,
  42                                       const uint8_t *buf,
  43                                       int buf_size,
  44                                       const char *filename)
  45 {
  46     if (qcrypto_block_has_format(format, buf, buf_size)) {
  47         return 100;
  48     } else {
  49         return 0;
  50     }
  51 }
  52
  53
  54 static ssize_t block_crypto_read_func(QCryptoBlock *block,
  55                                       size_t offset,
  56                                       uint8_t *buf,
  57                                       size_t buflen,
  58                                       void *opaque,
  59                                       Error **errp)
  60 {
  61     BlockDriverState *bs = opaque;
  62     ssize_t ret;
  63
  64     ret = bdrv_pread(bs->file, offset, buf, buflen);
  65     if (ret < 0) {
  66         error_setg_errno(errp, -ret, "Could not read encryption header");
  67         return ret;
  68     }
  69     return ret;
  70 }
  71
  72
  73 struct BlockCryptoCreateData {
  74     BlockBackend *blk;
  75     uint64_t size;
  76 };
  77
  78
  79 static ssize_t block_crypto_write_func(QCryptoBlock *block,
  80                                        size_t offset,
  81                                        const uint8_t *buf,
  82                                        size_t buflen,
  83                                        void *opaque,
  84                                        Error **errp)
  85 {
  86     struct BlockCryptoCreateData *data = opaque;
  87     ssize_t ret;
  88
  89     ret = blk_pwrite(data->blk, offset, buf, buflen, 0);
  90     if (ret < 0) {
  91         error_setg_errno(errp, -ret, "Could not write encryption header");
  92         return ret;
  93     }
  94     return ret;
  95 }
  96
  97
  98 static ssize_t block_crypto_init_func(QCryptoBlock *block,
  99                                       size_t headerlen,
 100                                       void *opaque,
 101                                       Error **errp)
 102 {
 103     struct BlockCryptoCreateData *data = opaque;
 104
 105     if (data->size > INT64_MAX || headerlen > INT64_MAX - data->size) {
 106         error_setg(errp, "The requested file size is too large");
 107         return -EFBIG;
 108     }
 109
 110     /* User provided size should reflect amount of space made
 111      * available to the guest, so we must take account of that
 112      * which will be used by the crypto header
 113      */
 114     return blk_truncate(data->blk, data->size + headerlen, PREALLOC_MODE_OFF,
 115                         errp);
 116 }
 117
 118
 119 static QemuOptsList block_crypto_runtime_opts_luks = {
 120     .name = "crypto",
 121     .head = QTAILQ_HEAD_INITIALIZER(block_crypto_runtime_opts_luks.head),
 122     .desc = {
 123         BLOCK_CRYPTO_OPT_DEF_LUKS_KEY_SECRET(""),
 124         { /* end of list */ }
 125     },
 126 };
 127
 128
 129 static QemuOptsList block_crypto_create_opts_luks = {
 130     .name = "crypto",
 131     .head = QTAILQ_HEAD_INITIALIZER(block_crypto_create_opts_luks.head),
 132     .desc = {
 133         {
 134             .name = BLOCK_OPT_SIZE,
 135             .type = QEMU_OPT_SIZE,
 136             .help = "Virtual disk size"
 137         },
 138         BLOCK_CRYPTO_OPT_DEF_LUKS_KEY_SECRET(""),
 139         BLOCK_CRYPTO_OPT_DEF_LUKS_CIPHER_ALG(""),
 140         BLOCK_CRYPTO_OPT_DEF_LUKS_CIPHER_MODE(""),
 141         BLOCK_CRYPTO_OPT_DEF_LUKS_IVGEN_ALG(""),
 142         BLOCK_CRYPTO_OPT_DEF_LUKS_IVGEN_HASH_ALG(""),
 143         BLOCK_CRYPTO_OPT_DEF_LUKS_HASH_ALG(""),
 144         BLOCK_CRYPTO_OPT_DEF_LUKS_ITER_TIME(""),
 145         { /* end of list */ }
 146     },
 147 };
 148
 149
 150 QCryptoBlockOpenOptions *
 151 block_crypto_open_opts_init(QCryptoBlockFormat format,
 152                             QDict *opts,
 153                             Error **errp)
 154 {
 155     Visitor *v;
 156     QCryptoBlockOpenOptions *ret = NULL;
 157     Error *local_err = NULL;
 158
 159     ret = g_new0(QCryptoBlockOpenOptions, 1);
 160     ret->format = format;
 161
 162     v = qobject_input_visitor_new_keyval(QOBJECT(opts));
 163
 164     visit_start_struct(v, NULL, NULL, 0, &local_err);
 165     if (local_err) {
 166         goto out;
 167     }
 168
 169     switch (format) {
 170     case Q_CRYPTO_BLOCK_FORMAT_LUKS:
 171         visit_type_QCryptoBlockOptionsLUKS_members(
 172             v, &ret->u.luks, &local_err);
 173         break;
 174
 175     case Q_CRYPTO_BLOCK_FORMAT_QCOW:
 176         visit_type_QCryptoBlockOptionsQCow_members(
 177             v, &ret->u.qcow, &local_err);
 178         break;
 179
 180     default:
 181         error_setg(&local_err, "Unsupported block format %d", format);
 182         break;
 183     }
 184     if (!local_err) {
 185         visit_check_struct(v, &local_err);
 186     }
 187
 188     visit_end_struct(v, NULL);
 189
 190  out:
 191     if (local_err) {
 192         error_propagate(errp, local_err);
 193         qapi_free_QCryptoBlockOpenOptions(ret);
 194         ret = NULL;
 195     }
 196     visit_free(v);
 197     return ret;
 198 }
 199
 200
 201 QCryptoBlockCreateOptions *
 202 block_crypto_create_opts_init(QCryptoBlockFormat format,
 203                               QDict *opts,
 204                               Error **errp)
 205 {
 206     Visitor *v;
 207     QCryptoBlockCreateOptions *ret = NULL;
 208     Error *local_err = NULL;
 209
 210     ret = g_new0(QCryptoBlockCreateOptions, 1);
 211     ret->format = format;
 212
 213     v = qobject_input_visitor_new_keyval(QOBJECT(opts));
 214
 215     visit_start_struct(v, NULL, NULL, 0, &local_err);
 216     if (local_err) {
 217         goto out;
 218     }
 219
 220     switch (format) {
 221     case Q_CRYPTO_BLOCK_FORMAT_LUKS:
 222         visit_type_QCryptoBlockCreateOptionsLUKS_members(
 223             v, &ret->u.luks, &local_err);
 224         break;
 225
 226     case Q_CRYPTO_BLOCK_FORMAT_QCOW:
 227         visit_type_QCryptoBlockOptionsQCow_members(
 228             v, &ret->u.qcow, &local_err);
 229         break;
 230
 231     default:
 232         error_setg(&local_err, "Unsupported block format %d", format);
 233         break;
 234     }
 235     if (!local_err) {
 236         visit_check_struct(v, &local_err);
 237     }
 238
 239     visit_end_struct(v, NULL);
 240
 241  out:
 242     if (local_err) {
 243         error_propagate(errp, local_err);
 244         qapi_free_QCryptoBlockCreateOptions(ret);
 245         ret = NULL;
 246     }
 247     visit_free(v);
 248     return ret;
 249 }
 250
 251
 252 static int block_crypto_open_generic(QCryptoBlockFormat format,
 253                                      QemuOptsList *opts_spec,
 254                                      BlockDriverState *bs,
 255                                      QDict *options,
 256                                      int flags,
 257                                      Error **errp)
 258 {
 259     BlockCrypto *crypto = bs->opaque;
 260     QemuOpts *opts = NULL;
 261     Error *local_err = NULL;
 262     int ret = -EINVAL;
 263     QCryptoBlockOpenOptions *open_opts = NULL;
 264     unsigned int cflags = 0;
 265     QDict *cryptoopts = NULL;
 266
 267     bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
 268                                false, errp);
 269     if (!bs->file) {
 270         return -EINVAL;
 271     }
 272
 273     bs->supported_write_flags = BDRV_REQ_FUA &
 274         bs->file->bs->supported_write_flags;
 275
 276     opts = qemu_opts_create(opts_spec, NULL, 0, &error_abort);
 277     qemu_opts_absorb_qdict(opts, options, &local_err);
 278     if (local_err) {
 279         error_propagate(errp, local_err);
 280         goto cleanup;
 281     }
 282
 283     cryptoopts = qemu_opts_to_qdict(opts, NULL);
 284
 285     open_opts = block_crypto_open_opts_init(format, cryptoopts, errp);
 286     if (!open_opts) {
 287         goto cleanup;
 288     }
 289
 290     if (flags & BDRV_O_NO_IO) {
 291         cflags |= QCRYPTO_BLOCK_OPEN_NO_IO;
 292     }
 293     crypto->block = qcrypto_block_open(open_opts, NULL,
 294                                        block_crypto_read_func,
 295                                        bs,
 296                                        cflags,
 297                                        errp);
 298
 299     if (!crypto->block) {
 300         ret = -EIO;
 301         goto cleanup;
 302     }
 303
 304     bs->encrypted = true;
 305
 306     ret = 0;
 307  cleanup:
 308     qobject_unref(cryptoopts);
 309     qapi_free_QCryptoBlockOpenOptions(open_opts);
 310     return ret;
 311 }
 312
 313
 314 static int block_crypto_co_create_generic(BlockDriverState *bs,
 315                                           int64_t size,
 316                                           QCryptoBlockCreateOptions *opts,
 317                                           Error **errp)
 318 {
 319     int ret;
 320     BlockBackend *blk;
 321     QCryptoBlock *crypto = NULL;
 322     struct BlockCryptoCreateData data;
 323
 324     blk = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL);
 325
 326     ret = blk_insert_bs(blk, bs, errp);
 327     if (ret < 0) {
 328         goto cleanup;
 329     }
 330
 331     data = (struct BlockCryptoCreateData) {
 332         .blk = blk,
 333         .size = size,
 334     };
 335
 336     crypto = qcrypto_block_create(opts, NULL,
 337                                   block_crypto_init_func,
 338                                   block_crypto_write_func,
 339                                   &data,
 340                                   errp);
 341
 342     if (!crypto) {
 343         ret = -EIO;
 344         goto cleanup;
 345     }
 346
 347     ret = 0;
 348  cleanup:
 349     qcrypto_block_free(crypto);
 350     blk_unref(blk);
 351     return ret;
 352 }
 353
 354 static int block_crypto_truncate(BlockDriverState *bs, int64_t offset,
 355                                  PreallocMode prealloc, Error **errp)
 356 {
 357     BlockCrypto *crypto = bs->opaque;
 358     uint64_t payload_offset =
 359         qcrypto_block_get_payload_offset(crypto->block);
 360
 361     if (payload_offset > INT64_MAX - offset) {
 362         error_setg(errp, "The requested file size is too large");
 363         return -EFBIG;
 364     }
 365
 366     offset += payload_offset;
 367
 368     return bdrv_truncate(bs->file, offset, prealloc, errp);
 369 }
 370
 371 static void block_crypto_close(BlockDriverState *bs)
 372 {
 373     BlockCrypto *crypto = bs->opaque;
 374     qcrypto_block_free(crypto->block);
 375 }
 376
 377 static int block_crypto_reopen_prepare(BDRVReopenState *state,
 378                                        BlockReopenQueue *queue, Error **errp)
 379 {
 380     /* nothing needs checking */
 381     return 0;
 382 }
 383
 384 /*
 385  * 1 MB bounce buffer gives good performance / memory tradeoff
 386  * when using cache=none|directsync.
 387  */
 388 #define BLOCK_CRYPTO_MAX_IO_SIZE (1024 * 1024)
 389
 390 static coroutine_fn int
 391 block_crypto_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
 392                        QEMUIOVector *qiov, int flags)
 393 {
 394     BlockCrypto *crypto = bs->opaque;
 395     uint64_t cur_bytes; /* number of bytes in current iteration */
 396     uint64_t bytes_done = 0;
 397     uint8_t *cipher_data = NULL;
 398     QEMUIOVector hd_qiov;
 399     int ret = 0;
 400     uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block);
 401     uint64_t payload_offset = qcrypto_block_get_payload_offset(crypto->block);
 402
 403     assert(!flags);
 404     assert(payload_offset < INT64_MAX);
 405     assert(QEMU_IS_ALIGNED(offset, sector_size));
 406     assert(QEMU_IS_ALIGNED(bytes, sector_size));
 407
 408     qemu_iovec_init(&hd_qiov, qiov->niov);
 409
 410     /* Bounce buffer because we don't wish to expose cipher text
 411      * in qiov which points to guest memory.
 412      */
 413     cipher_data =
 414         qemu_try_blockalign(bs->file->bs, MIN(BLOCK_CRYPTO_MAX_IO_SIZE,
 415                                               qiov->size));
 416     if (cipher_data == NULL) {
 417         ret = -ENOMEM;
 418         goto cleanup;
 419     }
 420
 421     while (bytes) {
 422         cur_bytes = MIN(bytes, BLOCK_CRYPTO_MAX_IO_SIZE);
 423
 424         qemu_iovec_reset(&hd_qiov);
 425         qemu_iovec_add(&hd_qiov, cipher_data, cur_bytes);
 426
 427         ret = bdrv_co_preadv(bs->file, payload_offset + offset + bytes_done,
 428                              cur_bytes, &hd_qiov, 0);
 429         if (ret < 0) {
 430             goto cleanup;
 431         }
 432
 433         if (qcrypto_block_decrypt(crypto->block, offset + bytes_done,
 434                                   cipher_data, cur_bytes, NULL) < 0) {
 435             ret = -EIO;
 436             goto cleanup;
 437         }
 438
 439         qemu_iovec_from_buf(qiov, bytes_done, cipher_data, cur_bytes);
 440
 441         bytes -= cur_bytes;
 442         bytes_done += cur_bytes;
 443     }
 444
 445  cleanup:
 446     qemu_iovec_destroy(&hd_qiov);
 447     qemu_vfree(cipher_data);
 448
 449     return ret;
 450 }
 451
 452
 453 static coroutine_fn int
 454 block_crypto_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
 455                         QEMUIOVector *qiov, int flags)
 456 {
 457     BlockCrypto *crypto = bs->opaque;
 458     uint64_t cur_bytes; /* number of bytes in current iteration */
 459     uint64_t bytes_done = 0;
 460     uint8_t *cipher_data = NULL;
 461     QEMUIOVector hd_qiov;
 462     int ret = 0;
 463     uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block);
 464     uint64_t payload_offset = qcrypto_block_get_payload_offset(crypto->block);
 465
 466     assert(!(flags & ~BDRV_REQ_FUA));
 467     assert(payload_offset < INT64_MAX);
 468     assert(QEMU_IS_ALIGNED(offset, sector_size));
 469     assert(QEMU_IS_ALIGNED(bytes, sector_size));
 470
 471     qemu_iovec_init(&hd_qiov, qiov->niov);
 472
 473     /* Bounce buffer because we're not permitted to touch
 474      * contents of qiov - it points to guest memory.
 475      */
 476     cipher_data =
 477         qemu_try_blockalign(bs->file->bs, MIN(BLOCK_CRYPTO_MAX_IO_SIZE,
 478                                               qiov->size));
 479     if (cipher_data == NULL) {
 480         ret = -ENOMEM;
 481         goto cleanup;
 482     }
 483
 484     while (bytes) {
 485         cur_bytes = MIN(bytes, BLOCK_CRYPTO_MAX_IO_SIZE);
 486
 487         qemu_iovec_to_buf(qiov, bytes_done, cipher_data, cur_bytes);
 488
 489         if (qcrypto_block_encrypt(crypto->block, offset + bytes_done,
 490                                   cipher_data, cur_bytes, NULL) < 0) {
 491             ret = -EIO;
 492             goto cleanup;
 493         }
 494
 495         qemu_iovec_reset(&hd_qiov);
 496         qemu_iovec_add(&hd_qiov, cipher_data, cur_bytes);
 497
 498         ret = bdrv_co_pwritev(bs->file, payload_offset + offset + bytes_done,
 499                               cur_bytes, &hd_qiov, flags);
 500         if (ret < 0) {
 501             goto cleanup;
 502         }
 503
 504         bytes -= cur_bytes;
 505         bytes_done += cur_bytes;
 506     }
 507
 508  cleanup:
 509     qemu_iovec_destroy(&hd_qiov);
 510     qemu_vfree(cipher_data);
 511
 512     return ret;
 513 }
 514
 515 static void block_crypto_refresh_limits(BlockDriverState *bs, Error **errp)
 516 {
 517     BlockCrypto *crypto = bs->opaque;
 518     uint64_t sector_size = qcrypto_block_get_sector_size(crypto->block);
 519     bs->bl.request_alignment = sector_size; /* No sub-sector I/O */
 520 }
 521
 522
 523 static int64_t block_crypto_getlength(BlockDriverState *bs)
 524 {
 525     BlockCrypto *crypto = bs->opaque;
 526     int64_t len = bdrv_getlength(bs->file->bs);
 527
 528     uint64_t offset = qcrypto_block_get_payload_offset(crypto->block);
 529     assert(offset < INT64_MAX);
 530
 531     if (offset > len) {
 532         return -EIO;
 533     }
 534
 535     len -= offset;
 536
 537     return len;
 538 }
 539
 540
 541 static int block_crypto_probe_luks(const uint8_t *buf,
 542                                    int buf_size,
 543                                    const char *filename) {
 544     return block_crypto_probe_generic(Q_CRYPTO_BLOCK_FORMAT_LUKS,
 545                                       buf, buf_size, filename);
 546 }
 547
 548 static int block_crypto_open_luks(BlockDriverState *bs,
 549                                   QDict *options,
 550                                   int flags,
 551                                   Error **errp)
 552 {
 553     return block_crypto_open_generic(Q_CRYPTO_BLOCK_FORMAT_LUKS,
 554                                      &block_crypto_runtime_opts_luks,
 555                                      bs, options, flags, errp);
 556 }
 557
 558 static int coroutine_fn
 559 block_crypto_co_create_luks(BlockdevCreateOptions *create_options, Error **errp)
 560 {
 561     BlockdevCreateOptionsLUKS *luks_opts;
 562     BlockDriverState *bs = NULL;
 563     QCryptoBlockCreateOptions create_opts;
 564     int ret;
 565
 566     assert(create_options->driver == BLOCKDEV_DRIVER_LUKS);
 567     luks_opts = &create_options->u.luks;
 568
 569     bs = bdrv_open_blockdev_ref(luks_opts->file, errp);
 570     if (bs == NULL) {
 571         return -EIO;
 572     }
 573
 574     create_opts = (QCryptoBlockCreateOptions) {
 575         .format = Q_CRYPTO_BLOCK_FORMAT_LUKS,
 576         .u.luks = *qapi_BlockdevCreateOptionsLUKS_base(luks_opts),
 577     };
 578
 579     ret = block_crypto_co_create_generic(bs, luks_opts->size, &create_opts,
 580                                          errp);
 581     if (ret < 0) {
 582         goto fail;
 583     }
 584
 585     ret = 0;
 586 fail:
 587     bdrv_unref(bs);
 588     return ret;
 589 }
 590
 591 static int coroutine_fn block_crypto_co_create_opts_luks(const char *filename,
 592                                                          QemuOpts *opts,
 593                                                          Error **errp)
 594 {
 595     QCryptoBlockCreateOptions *create_opts = NULL;
 596     BlockDriverState *bs = NULL;
 597     QDict *cryptoopts;
 598     int64_t size;
 599     int ret;
 600
 601     /* Parse options */
 602     size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0);
 603
 604     cryptoopts = qemu_opts_to_qdict_filtered(opts, NULL,
 605                                              &block_crypto_create_opts_luks,
 606                                              true);
 607
 608     create_opts = block_crypto_create_opts_init(Q_CRYPTO_BLOCK_FORMAT_LUKS,
 609                                                 cryptoopts, errp);
 610     if (!create_opts) {
 611         ret = -EINVAL;
 612         goto fail;
 613     }
 614
 615     /* Create protocol layer */
 616     ret = bdrv_create_file(filename, opts, errp);
 617     if (ret < 0) {
 618         return ret;
 619     }
 620
 621     bs = bdrv_open(filename, NULL, NULL,
 622                    BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp);
 623     if (!bs) {
 624         ret = -EINVAL;
 625         goto fail;
 626     }
 627
 628     /* Create format layer */
 629     ret = block_crypto_co_create_generic(bs, size, create_opts, errp);
 630     if (ret < 0) {
 631         goto fail;
 632     }
 633
 634     ret = 0;
 635 fail:
 636     bdrv_unref(bs);
 637     qapi_free_QCryptoBlockCreateOptions(create_opts);
 638     qobject_unref(cryptoopts);
 639     return ret;
 640 }
 641
 642 static int block_crypto_get_info_luks(BlockDriverState *bs,
 643                                       BlockDriverInfo *bdi)
 644 {
 645     BlockDriverInfo subbdi;
 646     int ret;
 647
 648     ret = bdrv_get_info(bs->file->bs, &subbdi);
 649     if (ret != 0) {
 650         return ret;
 651     }
 652
 653     bdi->unallocated_blocks_are_zero = false;
 654     bdi->cluster_size = subbdi.cluster_size;
 655
 656     return 0;
 657 }
 658
 659 static ImageInfoSpecific *
 660 block_crypto_get_specific_info_luks(BlockDriverState *bs)
 661 {
 662     BlockCrypto *crypto = bs->opaque;
 663     ImageInfoSpecific *spec_info;
 664     QCryptoBlockInfo *info;
 665
 666     info = qcrypto_block_get_info(crypto->block, NULL);
 667     if (!info) {
 668         return NULL;
 669     }
 670     if (info->format != Q_CRYPTO_BLOCK_FORMAT_LUKS) {
 671         qapi_free_QCryptoBlockInfo(info);
 672         return NULL;
 673     }
 674
 675     spec_info = g_new(ImageInfoSpecific, 1);
 676     spec_info->type = IMAGE_INFO_SPECIFIC_KIND_LUKS;
 677     spec_info->u.luks.data = g_new(QCryptoBlockInfoLUKS, 1);
 678     *spec_info->u.luks.data = info->u.luks;
 679
 680     /* Blank out pointers we've just stolen to avoid double free */
 681     memset(&info->u.luks, 0, sizeof(info->u.luks));
 682
 683     qapi_free_QCryptoBlockInfo(info);
 684
 685     return spec_info;
 686 }
 687
 688 BlockDriver bdrv_crypto_luks = {
 689     .format_name        = "luks",
 690     .instance_size      = sizeof(BlockCrypto),
 691     .bdrv_probe         = block_crypto_probe_luks,
 692     .bdrv_open          = block_crypto_open_luks,
 693     .bdrv_close         = block_crypto_close,
 694     .bdrv_child_perm    = bdrv_format_default_perms,
 695     .bdrv_co_create     = block_crypto_co_create_luks,
 696     .bdrv_co_create_opts = block_crypto_co_create_opts_luks,
 697     .bdrv_truncate      = block_crypto_truncate,
 698     .create_opts        = &block_crypto_create_opts_luks,
 699
 700     .bdrv_reopen_prepare = block_crypto_reopen_prepare,
 701     .bdrv_refresh_limits = block_crypto_refresh_limits,
 702     .bdrv_co_preadv     = block_crypto_co_preadv,
 703     .bdrv_co_pwritev    = block_crypto_co_pwritev,
 704     .bdrv_getlength     = block_crypto_getlength,
 705     .bdrv_get_info      = block_crypto_get_info_luks,
 706     .bdrv_get_specific_info = block_crypto_get_specific_info_luks,
 707 };
 708
 709 static void block_crypto_init(void)
 710 {
 711     bdrv_register(&bdrv_crypto_luks);
 712 }
 713
 714 block_init(block_crypto_init);