1 /* 2 * Block driver for the VMDK format 3 * 4 * Copyright (c) 2004 Fabrice Bellard 5 * Copyright (c) 2005 Filip Navara 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "qemu-common.h" 27 #include "block/block_int.h" 28 #include "qemu/module.h" 29 #include "migration/migration.h" 30 #include <zlib.h> 31 32 #define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D') 33 #define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V') 34 #define VMDK4_COMPRESSION_DEFLATE 1 35 #define VMDK4_FLAG_NL_DETECT (1 << 0) 36 #define VMDK4_FLAG_RGD (1 << 1) 37 /* Zeroed-grain enable bit */ 38 #define VMDK4_FLAG_ZERO_GRAIN (1 << 2) 39 #define VMDK4_FLAG_COMPRESS (1 << 16) 40 #define VMDK4_FLAG_MARKER (1 << 17) 41 #define VMDK4_GD_AT_END 0xffffffffffffffffULL 42 43 #define VMDK_GTE_ZEROED 0x1 44 45 /* VMDK internal error codes */ 46 #define VMDK_OK 0 47 #define VMDK_ERROR (-1) 48 /* Cluster not allocated */ 49 #define VMDK_UNALLOC (-2) 50 #define VMDK_ZEROED (-3) 51 52 #define BLOCK_OPT_ZEROED_GRAIN "zeroed_grain" 53 54 typedef struct { 55 uint32_t version; 56 uint32_t flags; 57 uint32_t disk_sectors; 58 uint32_t granularity; 59 uint32_t l1dir_offset; 60 uint32_t l1dir_size; 61 uint32_t file_sectors; 62 uint32_t cylinders; 63 uint32_t heads; 64 uint32_t sectors_per_track; 65 } QEMU_PACKED VMDK3Header; 66 67 typedef struct { 68 uint32_t version; 69 uint32_t flags; 70 uint64_t capacity; 71 uint64_t granularity; 72 uint64_t desc_offset; 73 uint64_t desc_size; 74 /* Number of GrainTableEntries per GrainTable */ 75 uint32_t num_gtes_per_gt; 76 uint64_t rgd_offset; 77 uint64_t gd_offset; 78 uint64_t grain_offset; 79 char filler[1]; 80 char check_bytes[4]; 81 uint16_t compressAlgorithm; 82 } QEMU_PACKED VMDK4Header; 83 84 #define L2_CACHE_SIZE 16 85 86 typedef struct VmdkExtent { 87 BlockDriverState *file; 88 bool flat; 89 bool compressed; 90 bool has_marker; 91 bool has_zero_grain; 92 int version; 93 int64_t sectors; 94 int64_t end_sector; 95 int64_t flat_start_offset; 96 int64_t l1_table_offset; 97 int64_t l1_backup_table_offset; 98 uint32_t *l1_table; 99 uint32_t *l1_backup_table; 100 unsigned int l1_size; 101 uint32_t l1_entry_sectors; 102 103 unsigned int l2_size; 104 uint32_t *l2_cache; 105 uint32_t l2_cache_offsets[L2_CACHE_SIZE]; 106 uint32_t l2_cache_counts[L2_CACHE_SIZE]; 107 108 int64_t cluster_sectors; 109 char *type; 110 } VmdkExtent; 111 112 typedef struct BDRVVmdkState { 113 CoMutex lock; 114 uint64_t desc_offset; 115 bool cid_updated; 116 bool cid_checked; 117 uint32_t cid; 118 uint32_t parent_cid; 119 int num_extents; 120 /* Extent array with num_extents entries, ascend ordered by address */ 121 VmdkExtent *extents; 122 Error *migration_blocker; 123 char *create_type; 124 } BDRVVmdkState; 125 126 typedef struct VmdkMetaData { 127 uint32_t offset; 128 unsigned int l1_index; 129 unsigned int l2_index; 130 unsigned int l2_offset; 131 int valid; 132 uint32_t *l2_cache_entry; 133 } VmdkMetaData; 134 135 typedef struct VmdkGrainMarker { 136 uint64_t lba; 137 uint32_t size; 138 uint8_t data[0]; 139 } QEMU_PACKED VmdkGrainMarker; 140 141 enum { 142 MARKER_END_OF_STREAM = 0, 143 MARKER_GRAIN_TABLE = 1, 144 MARKER_GRAIN_DIRECTORY = 2, 145 MARKER_FOOTER = 3, 146 }; 147 148 static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename) 149 { 150 uint32_t magic; 151 152 if (buf_size < 4) { 153 return 0; 154 } 155 magic = be32_to_cpu(*(uint32_t *)buf); 156 if (magic == VMDK3_MAGIC || 157 magic == VMDK4_MAGIC) { 158 return 100; 159 } else { 160 const char *p = (const char *)buf; 161 const char *end = p + buf_size; 162 while (p < end) { 163 if (*p == '#') { 164 /* skip comment line */ 165 while (p < end && *p != '\n') { 166 p++; 167 } 168 p++; 169 continue; 170 } 171 if (*p == ' ') { 172 while (p < end && *p == ' ') { 173 p++; 174 } 175 /* skip '\r' if windows line endings used. */ 176 if (p < end && *p == '\r') { 177 p++; 178 } 179 /* only accept blank lines before 'version=' line */ 180 if (p == end || *p != '\n') { 181 return 0; 182 } 183 p++; 184 continue; 185 } 186 if (end - p >= strlen("version=X\n")) { 187 if (strncmp("version=1\n", p, strlen("version=1\n")) == 0 || 188 strncmp("version=2\n", p, strlen("version=2\n")) == 0) { 189 return 100; 190 } 191 } 192 if (end - p >= strlen("version=X\r\n")) { 193 if (strncmp("version=1\r\n", p, strlen("version=1\r\n")) == 0 || 194 strncmp("version=2\r\n", p, strlen("version=2\r\n")) == 0) { 195 return 100; 196 } 197 } 198 return 0; 199 } 200 return 0; 201 } 202 } 203 204 #define SECTOR_SIZE 512 205 #define DESC_SIZE (20 * SECTOR_SIZE) /* 20 sectors of 512 bytes each */ 206 #define BUF_SIZE 4096 207 #define HEADER_SIZE 512 /* first sector of 512 bytes */ 208 209 static void vmdk_free_extents(BlockDriverState *bs) 210 { 211 int i; 212 BDRVVmdkState *s = bs->opaque; 213 VmdkExtent *e; 214 215 for (i = 0; i < s->num_extents; i++) { 216 e = &s->extents[i]; 217 g_free(e->l1_table); 218 g_free(e->l2_cache); 219 g_free(e->l1_backup_table); 220 g_free(e->type); 221 if (e->file != bs->file) { 222 bdrv_unref(e->file); 223 } 224 } 225 g_free(s->extents); 226 } 227 228 static void vmdk_free_last_extent(BlockDriverState *bs) 229 { 230 BDRVVmdkState *s = bs->opaque; 231 232 if (s->num_extents == 0) { 233 return; 234 } 235 s->num_extents--; 236 s->extents = g_realloc(s->extents, s->num_extents * sizeof(VmdkExtent)); 237 } 238 239 static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) 240 { 241 char desc[DESC_SIZE]; 242 uint32_t cid = 0xffffffff; 243 const char *p_name, *cid_str; 244 size_t cid_str_size; 245 BDRVVmdkState *s = bs->opaque; 246 int ret; 247 248 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); 249 if (ret < 0) { 250 return 0; 251 } 252 253 if (parent) { 254 cid_str = "parentCID"; 255 cid_str_size = sizeof("parentCID"); 256 } else { 257 cid_str = "CID"; 258 cid_str_size = sizeof("CID"); 259 } 260 261 desc[DESC_SIZE - 1] = '\0'; 262 p_name = strstr(desc, cid_str); 263 if (p_name != NULL) { 264 p_name += cid_str_size; 265 sscanf(p_name, "%x", &cid); 266 } 267 268 return cid; 269 } 270 271 static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) 272 { 273 char desc[DESC_SIZE], tmp_desc[DESC_SIZE]; 274 char *p_name, *tmp_str; 275 BDRVVmdkState *s = bs->opaque; 276 int ret; 277 278 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); 279 if (ret < 0) { 280 return ret; 281 } 282 283 desc[DESC_SIZE - 1] = '\0'; 284 tmp_str = strstr(desc, "parentCID"); 285 if (tmp_str == NULL) { 286 return -EINVAL; 287 } 288 289 pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str); 290 p_name = strstr(desc, "CID"); 291 if (p_name != NULL) { 292 p_name += sizeof("CID"); 293 snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); 294 pstrcat(desc, sizeof(desc), tmp_desc); 295 } 296 297 ret = bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE); 298 if (ret < 0) { 299 return ret; 300 } 301 302 return 0; 303 } 304 305 static int vmdk_is_cid_valid(BlockDriverState *bs) 306 { 307 BDRVVmdkState *s = bs->opaque; 308 BlockDriverState *p_bs = bs->backing_hd; 309 uint32_t cur_pcid; 310 311 if (!s->cid_checked && p_bs) { 312 cur_pcid = vmdk_read_cid(p_bs, 0); 313 if (s->parent_cid != cur_pcid) { 314 /* CID not valid */ 315 return 0; 316 } 317 } 318 s->cid_checked = true; 319 /* CID valid */ 320 return 1; 321 } 322 323 /* Queue extents, if any, for reopen() */ 324 static int vmdk_reopen_prepare(BDRVReopenState *state, 325 BlockReopenQueue *queue, Error **errp) 326 { 327 BDRVVmdkState *s; 328 int ret = -1; 329 int i; 330 VmdkExtent *e; 331 332 assert(state != NULL); 333 assert(state->bs != NULL); 334 335 if (queue == NULL) { 336 error_setg(errp, "No reopen queue for VMDK extents"); 337 goto exit; 338 } 339 340 s = state->bs->opaque; 341 342 assert(s != NULL); 343 344 for (i = 0; i < s->num_extents; i++) { 345 e = &s->extents[i]; 346 if (e->file != state->bs->file) { 347 bdrv_reopen_queue(queue, e->file, state->flags); 348 } 349 } 350 ret = 0; 351 352 exit: 353 return ret; 354 } 355 356 static int vmdk_parent_open(BlockDriverState *bs) 357 { 358 char *p_name; 359 char desc[DESC_SIZE + 1]; 360 BDRVVmdkState *s = bs->opaque; 361 int ret; 362 363 desc[DESC_SIZE] = '\0'; 364 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); 365 if (ret < 0) { 366 return ret; 367 } 368 369 p_name = strstr(desc, "parentFileNameHint"); 370 if (p_name != NULL) { 371 char *end_name; 372 373 p_name += sizeof("parentFileNameHint") + 1; 374 end_name = strchr(p_name, '\"'); 375 if (end_name == NULL) { 376 return -EINVAL; 377 } 378 if ((end_name - p_name) > sizeof(bs->backing_file) - 1) { 379 return -EINVAL; 380 } 381 382 pstrcpy(bs->backing_file, end_name - p_name + 1, p_name); 383 } 384 385 return 0; 386 } 387 388 /* Create and append extent to the extent array. Return the added VmdkExtent 389 * address. return NULL if allocation failed. */ 390 static int vmdk_add_extent(BlockDriverState *bs, 391 BlockDriverState *file, bool flat, int64_t sectors, 392 int64_t l1_offset, int64_t l1_backup_offset, 393 uint32_t l1_size, 394 int l2_size, uint64_t cluster_sectors, 395 VmdkExtent **new_extent, 396 Error **errp) 397 { 398 VmdkExtent *extent; 399 BDRVVmdkState *s = bs->opaque; 400 401 if (cluster_sectors > 0x200000) { 402 /* 0x200000 * 512Bytes = 1GB for one cluster is unrealistic */ 403 error_setg(errp, "Invalid granularity, image may be corrupt"); 404 return -EFBIG; 405 } 406 if (l1_size > 512 * 1024 * 1024) { 407 /* Although with big capacity and small l1_entry_sectors, we can get a 408 * big l1_size, we don't want unbounded value to allocate the table. 409 * Limit it to 512M, which is 16PB for default cluster and L2 table 410 * size */ 411 error_setg(errp, "L1 size too big"); 412 return -EFBIG; 413 } 414 415 s->extents = g_realloc(s->extents, 416 (s->num_extents + 1) * sizeof(VmdkExtent)); 417 extent = &s->extents[s->num_extents]; 418 s->num_extents++; 419 420 memset(extent, 0, sizeof(VmdkExtent)); 421 extent->file = file; 422 extent->flat = flat; 423 extent->sectors = sectors; 424 extent->l1_table_offset = l1_offset; 425 extent->l1_backup_table_offset = l1_backup_offset; 426 extent->l1_size = l1_size; 427 extent->l1_entry_sectors = l2_size * cluster_sectors; 428 extent->l2_size = l2_size; 429 extent->cluster_sectors = flat ? sectors : cluster_sectors; 430 431 if (s->num_extents > 1) { 432 extent->end_sector = (*(extent - 1)).end_sector + extent->sectors; 433 } else { 434 extent->end_sector = extent->sectors; 435 } 436 bs->total_sectors = extent->end_sector; 437 if (new_extent) { 438 *new_extent = extent; 439 } 440 return 0; 441 } 442 443 static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent, 444 Error **errp) 445 { 446 int ret; 447 int l1_size, i; 448 449 /* read the L1 table */ 450 l1_size = extent->l1_size * sizeof(uint32_t); 451 extent->l1_table = g_malloc(l1_size); 452 ret = bdrv_pread(extent->file, 453 extent->l1_table_offset, 454 extent->l1_table, 455 l1_size); 456 if (ret < 0) { 457 error_setg_errno(errp, -ret, 458 "Could not read l1 table from extent '%s'", 459 extent->file->filename); 460 goto fail_l1; 461 } 462 for (i = 0; i < extent->l1_size; i++) { 463 le32_to_cpus(&extent->l1_table[i]); 464 } 465 466 if (extent->l1_backup_table_offset) { 467 extent->l1_backup_table = g_malloc(l1_size); 468 ret = bdrv_pread(extent->file, 469 extent->l1_backup_table_offset, 470 extent->l1_backup_table, 471 l1_size); 472 if (ret < 0) { 473 error_setg_errno(errp, -ret, 474 "Could not read l1 backup table from extent '%s'", 475 extent->file->filename); 476 goto fail_l1b; 477 } 478 for (i = 0; i < extent->l1_size; i++) { 479 le32_to_cpus(&extent->l1_backup_table[i]); 480 } 481 } 482 483 extent->l2_cache = 484 g_malloc(extent->l2_size * L2_CACHE_SIZE * sizeof(uint32_t)); 485 return 0; 486 fail_l1b: 487 g_free(extent->l1_backup_table); 488 fail_l1: 489 g_free(extent->l1_table); 490 return ret; 491 } 492 493 static int vmdk_open_vmfs_sparse(BlockDriverState *bs, 494 BlockDriverState *file, 495 int flags, Error **errp) 496 { 497 int ret; 498 uint32_t magic; 499 VMDK3Header header; 500 VmdkExtent *extent; 501 502 ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); 503 if (ret < 0) { 504 error_setg_errno(errp, -ret, 505 "Could not read header from file '%s'", 506 file->filename); 507 return ret; 508 } 509 ret = vmdk_add_extent(bs, file, false, 510 le32_to_cpu(header.disk_sectors), 511 le32_to_cpu(header.l1dir_offset) << 9, 512 0, 513 le32_to_cpu(header.l1dir_size), 514 4096, 515 le32_to_cpu(header.granularity), 516 &extent, 517 errp); 518 if (ret < 0) { 519 return ret; 520 } 521 ret = vmdk_init_tables(bs, extent, errp); 522 if (ret) { 523 /* free extent allocated by vmdk_add_extent */ 524 vmdk_free_last_extent(bs); 525 } 526 return ret; 527 } 528 529 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, 530 uint64_t desc_offset, Error **errp); 531 532 static int vmdk_open_vmdk4(BlockDriverState *bs, 533 BlockDriverState *file, 534 int flags, Error **errp) 535 { 536 int ret; 537 uint32_t magic; 538 uint32_t l1_size, l1_entry_sectors; 539 VMDK4Header header; 540 VmdkExtent *extent; 541 BDRVVmdkState *s = bs->opaque; 542 int64_t l1_backup_offset = 0; 543 544 ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); 545 if (ret < 0) { 546 error_setg_errno(errp, -ret, 547 "Could not read header from file '%s'", 548 file->filename); 549 } 550 if (header.capacity == 0) { 551 uint64_t desc_offset = le64_to_cpu(header.desc_offset); 552 if (desc_offset) { 553 return vmdk_open_desc_file(bs, flags, desc_offset << 9, errp); 554 } 555 } 556 557 if (!s->create_type) { 558 s->create_type = g_strdup("monolithicSparse"); 559 } 560 561 if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) { 562 /* 563 * The footer takes precedence over the header, so read it in. The 564 * footer starts at offset -1024 from the end: One sector for the 565 * footer, and another one for the end-of-stream marker. 566 */ 567 struct { 568 struct { 569 uint64_t val; 570 uint32_t size; 571 uint32_t type; 572 uint8_t pad[512 - 16]; 573 } QEMU_PACKED footer_marker; 574 575 uint32_t magic; 576 VMDK4Header header; 577 uint8_t pad[512 - 4 - sizeof(VMDK4Header)]; 578 579 struct { 580 uint64_t val; 581 uint32_t size; 582 uint32_t type; 583 uint8_t pad[512 - 16]; 584 } QEMU_PACKED eos_marker; 585 } QEMU_PACKED footer; 586 587 ret = bdrv_pread(file, 588 bs->file->total_sectors * 512 - 1536, 589 &footer, sizeof(footer)); 590 if (ret < 0) { 591 return ret; 592 } 593 594 /* Some sanity checks for the footer */ 595 if (be32_to_cpu(footer.magic) != VMDK4_MAGIC || 596 le32_to_cpu(footer.footer_marker.size) != 0 || 597 le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER || 598 le64_to_cpu(footer.eos_marker.val) != 0 || 599 le32_to_cpu(footer.eos_marker.size) != 0 || 600 le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM) 601 { 602 return -EINVAL; 603 } 604 605 header = footer.header; 606 } 607 608 if (le32_to_cpu(header.version) > 3) { 609 char buf[64]; 610 snprintf(buf, sizeof(buf), "VMDK version %d", 611 le32_to_cpu(header.version)); 612 qerror_report(QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, 613 bs->device_name, "vmdk", buf); 614 return -ENOTSUP; 615 } else if (le32_to_cpu(header.version) == 3 && (flags & BDRV_O_RDWR)) { 616 /* VMware KB 2064959 explains that version 3 added support for 617 * persistent changed block tracking (CBT), and backup software can 618 * read it as version=1 if it doesn't care about the changed area 619 * information. So we are safe to enable read only. */ 620 error_setg(errp, "VMDK version 3 must be read only"); 621 return -EINVAL; 622 } 623 624 if (le32_to_cpu(header.num_gtes_per_gt) > 512) { 625 error_report("L2 table size too big"); 626 return -EINVAL; 627 } 628 629 l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gt) 630 * le64_to_cpu(header.granularity); 631 if (l1_entry_sectors == 0) { 632 return -EINVAL; 633 } 634 l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1) 635 / l1_entry_sectors; 636 if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) { 637 l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9; 638 } 639 if (bdrv_getlength(file) < 640 le64_to_cpu(header.grain_offset) * BDRV_SECTOR_SIZE) { 641 error_report("File truncated, expecting at least %lld bytes", 642 le64_to_cpu(header.grain_offset) * BDRV_SECTOR_SIZE); 643 return -EINVAL; 644 } 645 646 ret = vmdk_add_extent(bs, file, false, 647 le64_to_cpu(header.capacity), 648 le64_to_cpu(header.gd_offset) << 9, 649 l1_backup_offset, 650 l1_size, 651 le32_to_cpu(header.num_gtes_per_gt), 652 le64_to_cpu(header.granularity), 653 &extent, 654 errp); 655 if (ret < 0) { 656 return ret; 657 } 658 extent->compressed = 659 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; 660 if (extent->compressed) { 661 g_free(s->create_type); 662 s->create_type = g_strdup("streamOptimized"); 663 } 664 extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER; 665 extent->version = le32_to_cpu(header.version); 666 extent->has_zero_grain = le32_to_cpu(header.flags) & VMDK4_FLAG_ZERO_GRAIN; 667 ret = vmdk_init_tables(bs, extent, errp); 668 if (ret) { 669 /* free extent allocated by vmdk_add_extent */ 670 vmdk_free_last_extent(bs); 671 } 672 return ret; 673 } 674 675 /* find an option value out of descriptor file */ 676 static int vmdk_parse_description(const char *desc, const char *opt_name, 677 char *buf, int buf_size) 678 { 679 char *opt_pos, *opt_end; 680 const char *end = desc + strlen(desc); 681 682 opt_pos = strstr(desc, opt_name); 683 if (!opt_pos) { 684 return VMDK_ERROR; 685 } 686 /* Skip "=\"" following opt_name */ 687 opt_pos += strlen(opt_name) + 2; 688 if (opt_pos >= end) { 689 return VMDK_ERROR; 690 } 691 opt_end = opt_pos; 692 while (opt_end < end && *opt_end != '"') { 693 opt_end++; 694 } 695 if (opt_end == end || buf_size < opt_end - opt_pos + 1) { 696 return VMDK_ERROR; 697 } 698 pstrcpy(buf, opt_end - opt_pos + 1, opt_pos); 699 return VMDK_OK; 700 } 701 702 /* Open an extent file and append to bs array */ 703 static int vmdk_open_sparse(BlockDriverState *bs, 704 BlockDriverState *file, 705 int flags, Error **errp) 706 { 707 uint32_t magic; 708 709 if (bdrv_pread(file, 0, &magic, sizeof(magic)) != sizeof(magic)) { 710 return -EIO; 711 } 712 713 magic = be32_to_cpu(magic); 714 switch (magic) { 715 case VMDK3_MAGIC: 716 return vmdk_open_vmfs_sparse(bs, file, flags, errp); 717 break; 718 case VMDK4_MAGIC: 719 return vmdk_open_vmdk4(bs, file, flags, errp); 720 break; 721 default: 722 return -EMEDIUMTYPE; 723 break; 724 } 725 } 726 727 static int vmdk_parse_extents(const char *desc, BlockDriverState *bs, 728 const char *desc_file_path, Error **errp) 729 { 730 int ret; 731 char access[11]; 732 char type[11]; 733 char fname[512]; 734 const char *p = desc; 735 int64_t sectors = 0; 736 int64_t flat_offset; 737 char extent_path[PATH_MAX]; 738 BlockDriverState *extent_file; 739 BDRVVmdkState *s = bs->opaque; 740 VmdkExtent *extent; 741 742 while (*p) { 743 /* parse extent line: 744 * RW [size in sectors] FLAT "file-name.vmdk" OFFSET 745 * or 746 * RW [size in sectors] SPARSE "file-name.vmdk" 747 */ 748 flat_offset = -1; 749 ret = sscanf(p, "%10s %" SCNd64 " %10s \"%511[^\n\r\"]\" %" SCNd64, 750 access, §ors, type, fname, &flat_offset); 751 if (ret < 4 || strcmp(access, "RW")) { 752 goto next_line; 753 } else if (!strcmp(type, "FLAT")) { 754 if (ret != 5 || flat_offset < 0) { 755 error_setg(errp, "Invalid extent lines: \n%s", p); 756 return -EINVAL; 757 } 758 } else if (!strcmp(type, "VMFS")) { 759 if (ret == 4) { 760 flat_offset = 0; 761 } else { 762 error_setg(errp, "Invalid extent lines:\n%s", p); 763 return -EINVAL; 764 } 765 } else if (ret != 4) { 766 error_setg(errp, "Invalid extent lines:\n%s", p); 767 return -EINVAL; 768 } 769 770 if (sectors <= 0 || 771 (strcmp(type, "FLAT") && strcmp(type, "SPARSE") && 772 strcmp(type, "VMFS") && strcmp(type, "VMFSSPARSE")) || 773 (strcmp(access, "RW"))) { 774 goto next_line; 775 } 776 777 path_combine(extent_path, sizeof(extent_path), 778 desc_file_path, fname); 779 ret = bdrv_file_open(&extent_file, extent_path, NULL, NULL, 780 bs->open_flags, errp); 781 if (ret) { 782 return ret; 783 } 784 785 /* save to extents array */ 786 if (!strcmp(type, "FLAT") || !strcmp(type, "VMFS")) { 787 /* FLAT extent */ 788 789 ret = vmdk_add_extent(bs, extent_file, true, sectors, 790 0, 0, 0, 0, 0, &extent, errp); 791 if (ret < 0) { 792 return ret; 793 } 794 extent->flat_start_offset = flat_offset << 9; 795 } else if (!strcmp(type, "SPARSE") || !strcmp(type, "VMFSSPARSE")) { 796 /* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/ 797 ret = vmdk_open_sparse(bs, extent_file, bs->open_flags, errp); 798 if (ret) { 799 bdrv_unref(extent_file); 800 return ret; 801 } 802 extent = &s->extents[s->num_extents - 1]; 803 } else { 804 error_setg(errp, "Unsupported extent type '%s'", type); 805 return -ENOTSUP; 806 } 807 extent->type = g_strdup(type); 808 next_line: 809 /* move to next line */ 810 while (*p) { 811 if (*p == '\n') { 812 p++; 813 break; 814 } 815 p++; 816 } 817 } 818 return 0; 819 } 820 821 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, 822 uint64_t desc_offset, Error **errp) 823 { 824 int ret; 825 char *buf = NULL; 826 char ct[128]; 827 BDRVVmdkState *s = bs->opaque; 828 int64_t size; 829 830 size = bdrv_getlength(bs->file); 831 if (size < 0) { 832 return -EINVAL; 833 } 834 835 size = MIN(size, 1 << 20); /* avoid unbounded allocation */ 836 buf = g_malloc0(size + 1); 837 838 ret = bdrv_pread(bs->file, desc_offset, buf, size); 839 if (ret < 0) { 840 goto exit; 841 } 842 if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) { 843 ret = -EMEDIUMTYPE; 844 goto exit; 845 } 846 if (strcmp(ct, "monolithicFlat") && 847 strcmp(ct, "vmfs") && 848 strcmp(ct, "vmfsSparse") && 849 strcmp(ct, "twoGbMaxExtentSparse") && 850 strcmp(ct, "twoGbMaxExtentFlat")) { 851 error_setg(errp, "Unsupported image type '%s'", ct); 852 ret = -ENOTSUP; 853 goto exit; 854 } 855 s->create_type = g_strdup(ct); 856 s->desc_offset = 0; 857 ret = vmdk_parse_extents(buf, bs, bs->file->filename, errp); 858 exit: 859 g_free(buf); 860 return ret; 861 } 862 863 static int vmdk_open(BlockDriverState *bs, QDict *options, int flags, 864 Error **errp) 865 { 866 int ret; 867 BDRVVmdkState *s = bs->opaque; 868 869 if (vmdk_open_sparse(bs, bs->file, flags, errp) == 0) { 870 s->desc_offset = 0x200; 871 } else { 872 ret = vmdk_open_desc_file(bs, flags, 0, errp); 873 if (ret) { 874 goto fail; 875 } 876 } 877 /* try to open parent images, if exist */ 878 ret = vmdk_parent_open(bs); 879 if (ret) { 880 goto fail; 881 } 882 s->cid = vmdk_read_cid(bs, 0); 883 s->parent_cid = vmdk_read_cid(bs, 1); 884 qemu_co_mutex_init(&s->lock); 885 886 /* Disable migration when VMDK images are used */ 887 error_set(&s->migration_blocker, 888 QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 889 "vmdk", bs->device_name, "live migration"); 890 migrate_add_blocker(s->migration_blocker); 891 892 return 0; 893 894 fail: 895 g_free(s->create_type); 896 s->create_type = NULL; 897 vmdk_free_extents(bs); 898 return ret; 899 } 900 901 902 static int vmdk_refresh_limits(BlockDriverState *bs) 903 { 904 BDRVVmdkState *s = bs->opaque; 905 int i; 906 907 for (i = 0; i < s->num_extents; i++) { 908 if (!s->extents[i].flat) { 909 bs->bl.write_zeroes_alignment = 910 MAX(bs->bl.write_zeroes_alignment, 911 s->extents[i].cluster_sectors); 912 } 913 } 914 915 return 0; 916 } 917 918 static int get_whole_cluster(BlockDriverState *bs, 919 VmdkExtent *extent, 920 uint64_t cluster_offset, 921 uint64_t offset, 922 bool allocate) 923 { 924 int ret = VMDK_OK; 925 uint8_t *whole_grain = NULL; 926 927 /* we will be here if it's first write on non-exist grain(cluster). 928 * try to read from parent image, if exist */ 929 if (bs->backing_hd) { 930 whole_grain = 931 qemu_blockalign(bs, extent->cluster_sectors << BDRV_SECTOR_BITS); 932 if (!vmdk_is_cid_valid(bs)) { 933 ret = VMDK_ERROR; 934 goto exit; 935 } 936 937 /* floor offset to cluster */ 938 offset -= offset % (extent->cluster_sectors * 512); 939 ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain, 940 extent->cluster_sectors); 941 if (ret < 0) { 942 ret = VMDK_ERROR; 943 goto exit; 944 } 945 946 /* Write grain only into the active image */ 947 ret = bdrv_write(extent->file, cluster_offset, whole_grain, 948 extent->cluster_sectors); 949 if (ret < 0) { 950 ret = VMDK_ERROR; 951 goto exit; 952 } 953 } 954 exit: 955 qemu_vfree(whole_grain); 956 return ret; 957 } 958 959 static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) 960 { 961 uint32_t offset; 962 QEMU_BUILD_BUG_ON(sizeof(offset) != sizeof(m_data->offset)); 963 offset = cpu_to_le32(m_data->offset); 964 /* update L2 table */ 965 if (bdrv_pwrite_sync( 966 extent->file, 967 ((int64_t)m_data->l2_offset * 512) 968 + (m_data->l2_index * sizeof(m_data->offset)), 969 &offset, sizeof(offset)) < 0) { 970 return VMDK_ERROR; 971 } 972 /* update backup L2 table */ 973 if (extent->l1_backup_table_offset != 0) { 974 m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; 975 if (bdrv_pwrite_sync( 976 extent->file, 977 ((int64_t)m_data->l2_offset * 512) 978 + (m_data->l2_index * sizeof(m_data->offset)), 979 &offset, sizeof(offset)) < 0) { 980 return VMDK_ERROR; 981 } 982 } 983 if (m_data->l2_cache_entry) { 984 *m_data->l2_cache_entry = offset; 985 } 986 987 return VMDK_OK; 988 } 989 990 static int get_cluster_offset(BlockDriverState *bs, 991 VmdkExtent *extent, 992 VmdkMetaData *m_data, 993 uint64_t offset, 994 int allocate, 995 uint64_t *cluster_offset) 996 { 997 unsigned int l1_index, l2_offset, l2_index; 998 int min_index, i, j; 999 uint32_t min_count, *l2_table; 1000 bool zeroed = false; 1001 1002 if (m_data) { 1003 m_data->valid = 0; 1004 } 1005 if (extent->flat) { 1006 *cluster_offset = extent->flat_start_offset; 1007 return VMDK_OK; 1008 } 1009 1010 offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE; 1011 l1_index = (offset >> 9) / extent->l1_entry_sectors; 1012 if (l1_index >= extent->l1_size) { 1013 return VMDK_ERROR; 1014 } 1015 l2_offset = extent->l1_table[l1_index]; 1016 if (!l2_offset) { 1017 return VMDK_UNALLOC; 1018 } 1019 for (i = 0; i < L2_CACHE_SIZE; i++) { 1020 if (l2_offset == extent->l2_cache_offsets[i]) { 1021 /* increment the hit count */ 1022 if (++extent->l2_cache_counts[i] == 0xffffffff) { 1023 for (j = 0; j < L2_CACHE_SIZE; j++) { 1024 extent->l2_cache_counts[j] >>= 1; 1025 } 1026 } 1027 l2_table = extent->l2_cache + (i * extent->l2_size); 1028 goto found; 1029 } 1030 } 1031 /* not found: load a new entry in the least used one */ 1032 min_index = 0; 1033 min_count = 0xffffffff; 1034 for (i = 0; i < L2_CACHE_SIZE; i++) { 1035 if (extent->l2_cache_counts[i] < min_count) { 1036 min_count = extent->l2_cache_counts[i]; 1037 min_index = i; 1038 } 1039 } 1040 l2_table = extent->l2_cache + (min_index * extent->l2_size); 1041 if (bdrv_pread( 1042 extent->file, 1043 (int64_t)l2_offset * 512, 1044 l2_table, 1045 extent->l2_size * sizeof(uint32_t) 1046 ) != extent->l2_size * sizeof(uint32_t)) { 1047 return VMDK_ERROR; 1048 } 1049 1050 extent->l2_cache_offsets[min_index] = l2_offset; 1051 extent->l2_cache_counts[min_index] = 1; 1052 found: 1053 l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size; 1054 *cluster_offset = le32_to_cpu(l2_table[l2_index]); 1055 1056 if (m_data) { 1057 m_data->valid = 1; 1058 m_data->l1_index = l1_index; 1059 m_data->l2_index = l2_index; 1060 m_data->offset = *cluster_offset; 1061 m_data->l2_offset = l2_offset; 1062 m_data->l2_cache_entry = &l2_table[l2_index]; 1063 } 1064 if (extent->has_zero_grain && *cluster_offset == VMDK_GTE_ZEROED) { 1065 zeroed = true; 1066 } 1067 1068 if (!*cluster_offset || zeroed) { 1069 if (!allocate) { 1070 return zeroed ? VMDK_ZEROED : VMDK_UNALLOC; 1071 } 1072 1073 /* Avoid the L2 tables update for the images that have snapshots. */ 1074 *cluster_offset = bdrv_getlength(extent->file); 1075 if (!extent->compressed) { 1076 bdrv_truncate( 1077 extent->file, 1078 *cluster_offset + (extent->cluster_sectors << 9) 1079 ); 1080 } 1081 1082 *cluster_offset >>= 9; 1083 l2_table[l2_index] = cpu_to_le32(*cluster_offset); 1084 1085 /* First of all we write grain itself, to avoid race condition 1086 * that may to corrupt the image. 1087 * This problem may occur because of insufficient space on host disk 1088 * or inappropriate VM shutdown. 1089 */ 1090 if (get_whole_cluster( 1091 bs, extent, *cluster_offset, offset, allocate) == -1) { 1092 return VMDK_ERROR; 1093 } 1094 1095 if (m_data) { 1096 m_data->offset = *cluster_offset; 1097 } 1098 } 1099 *cluster_offset <<= 9; 1100 return VMDK_OK; 1101 } 1102 1103 static VmdkExtent *find_extent(BDRVVmdkState *s, 1104 int64_t sector_num, VmdkExtent *start_hint) 1105 { 1106 VmdkExtent *extent = start_hint; 1107 1108 if (!extent) { 1109 extent = &s->extents[0]; 1110 } 1111 while (extent < &s->extents[s->num_extents]) { 1112 if (sector_num < extent->end_sector) { 1113 return extent; 1114 } 1115 extent++; 1116 } 1117 return NULL; 1118 } 1119 1120 static int64_t coroutine_fn vmdk_co_get_block_status(BlockDriverState *bs, 1121 int64_t sector_num, int nb_sectors, int *pnum) 1122 { 1123 BDRVVmdkState *s = bs->opaque; 1124 int64_t index_in_cluster, n, ret; 1125 uint64_t offset; 1126 VmdkExtent *extent; 1127 1128 extent = find_extent(s, sector_num, NULL); 1129 if (!extent) { 1130 return 0; 1131 } 1132 qemu_co_mutex_lock(&s->lock); 1133 ret = get_cluster_offset(bs, extent, NULL, 1134 sector_num * 512, 0, &offset); 1135 qemu_co_mutex_unlock(&s->lock); 1136 1137 switch (ret) { 1138 case VMDK_ERROR: 1139 ret = -EIO; 1140 break; 1141 case VMDK_UNALLOC: 1142 ret = 0; 1143 break; 1144 case VMDK_ZEROED: 1145 ret = BDRV_BLOCK_ZERO; 1146 break; 1147 case VMDK_OK: 1148 ret = BDRV_BLOCK_DATA; 1149 if (extent->file == bs->file) { 1150 ret |= BDRV_BLOCK_OFFSET_VALID | offset; 1151 } 1152 1153 break; 1154 } 1155 1156 index_in_cluster = sector_num % extent->cluster_sectors; 1157 n = extent->cluster_sectors - index_in_cluster; 1158 if (n > nb_sectors) { 1159 n = nb_sectors; 1160 } 1161 *pnum = n; 1162 return ret; 1163 } 1164 1165 static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset, 1166 int64_t offset_in_cluster, const uint8_t *buf, 1167 int nb_sectors, int64_t sector_num) 1168 { 1169 int ret; 1170 VmdkGrainMarker *data = NULL; 1171 uLongf buf_len; 1172 const uint8_t *write_buf = buf; 1173 int write_len = nb_sectors * 512; 1174 1175 if (extent->compressed) { 1176 if (!extent->has_marker) { 1177 ret = -EINVAL; 1178 goto out; 1179 } 1180 buf_len = (extent->cluster_sectors << 9) * 2; 1181 data = g_malloc(buf_len + sizeof(VmdkGrainMarker)); 1182 if (compress(data->data, &buf_len, buf, nb_sectors << 9) != Z_OK || 1183 buf_len == 0) { 1184 ret = -EINVAL; 1185 goto out; 1186 } 1187 data->lba = sector_num; 1188 data->size = buf_len; 1189 write_buf = (uint8_t *)data; 1190 write_len = buf_len + sizeof(VmdkGrainMarker); 1191 } 1192 ret = bdrv_pwrite(extent->file, 1193 cluster_offset + offset_in_cluster, 1194 write_buf, 1195 write_len); 1196 if (ret != write_len) { 1197 ret = ret < 0 ? ret : -EIO; 1198 goto out; 1199 } 1200 ret = 0; 1201 out: 1202 g_free(data); 1203 return ret; 1204 } 1205 1206 static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset, 1207 int64_t offset_in_cluster, uint8_t *buf, 1208 int nb_sectors) 1209 { 1210 int ret; 1211 int cluster_bytes, buf_bytes; 1212 uint8_t *cluster_buf, *compressed_data; 1213 uint8_t *uncomp_buf; 1214 uint32_t data_len; 1215 VmdkGrainMarker *marker; 1216 uLongf buf_len; 1217 1218 1219 if (!extent->compressed) { 1220 ret = bdrv_pread(extent->file, 1221 cluster_offset + offset_in_cluster, 1222 buf, nb_sectors * 512); 1223 if (ret == nb_sectors * 512) { 1224 return 0; 1225 } else { 1226 return -EIO; 1227 } 1228 } 1229 cluster_bytes = extent->cluster_sectors * 512; 1230 /* Read two clusters in case GrainMarker + compressed data > one cluster */ 1231 buf_bytes = cluster_bytes * 2; 1232 cluster_buf = g_malloc(buf_bytes); 1233 uncomp_buf = g_malloc(cluster_bytes); 1234 ret = bdrv_pread(extent->file, 1235 cluster_offset, 1236 cluster_buf, buf_bytes); 1237 if (ret < 0) { 1238 goto out; 1239 } 1240 compressed_data = cluster_buf; 1241 buf_len = cluster_bytes; 1242 data_len = cluster_bytes; 1243 if (extent->has_marker) { 1244 marker = (VmdkGrainMarker *)cluster_buf; 1245 compressed_data = marker->data; 1246 data_len = le32_to_cpu(marker->size); 1247 } 1248 if (!data_len || data_len > buf_bytes) { 1249 ret = -EINVAL; 1250 goto out; 1251 } 1252 ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len); 1253 if (ret != Z_OK) { 1254 ret = -EINVAL; 1255 goto out; 1256 1257 } 1258 if (offset_in_cluster < 0 || 1259 offset_in_cluster + nb_sectors * 512 > buf_len) { 1260 ret = -EINVAL; 1261 goto out; 1262 } 1263 memcpy(buf, uncomp_buf + offset_in_cluster, nb_sectors * 512); 1264 ret = 0; 1265 1266 out: 1267 g_free(uncomp_buf); 1268 g_free(cluster_buf); 1269 return ret; 1270 } 1271 1272 static int vmdk_read(BlockDriverState *bs, int64_t sector_num, 1273 uint8_t *buf, int nb_sectors) 1274 { 1275 BDRVVmdkState *s = bs->opaque; 1276 int ret; 1277 uint64_t n, index_in_cluster; 1278 uint64_t extent_begin_sector, extent_relative_sector_num; 1279 VmdkExtent *extent = NULL; 1280 uint64_t cluster_offset; 1281 1282 while (nb_sectors > 0) { 1283 extent = find_extent(s, sector_num, extent); 1284 if (!extent) { 1285 return -EIO; 1286 } 1287 ret = get_cluster_offset( 1288 bs, extent, NULL, 1289 sector_num << 9, 0, &cluster_offset); 1290 extent_begin_sector = extent->end_sector - extent->sectors; 1291 extent_relative_sector_num = sector_num - extent_begin_sector; 1292 index_in_cluster = extent_relative_sector_num % extent->cluster_sectors; 1293 n = extent->cluster_sectors - index_in_cluster; 1294 if (n > nb_sectors) { 1295 n = nb_sectors; 1296 } 1297 if (ret != VMDK_OK) { 1298 /* if not allocated, try to read from parent image, if exist */ 1299 if (bs->backing_hd && ret != VMDK_ZEROED) { 1300 if (!vmdk_is_cid_valid(bs)) { 1301 return -EINVAL; 1302 } 1303 ret = bdrv_read(bs->backing_hd, sector_num, buf, n); 1304 if (ret < 0) { 1305 return ret; 1306 } 1307 } else { 1308 memset(buf, 0, 512 * n); 1309 } 1310 } else { 1311 ret = vmdk_read_extent(extent, 1312 cluster_offset, index_in_cluster * 512, 1313 buf, n); 1314 if (ret) { 1315 return ret; 1316 } 1317 } 1318 nb_sectors -= n; 1319 sector_num += n; 1320 buf += n * 512; 1321 } 1322 return 0; 1323 } 1324 1325 static coroutine_fn int vmdk_co_read(BlockDriverState *bs, int64_t sector_num, 1326 uint8_t *buf, int nb_sectors) 1327 { 1328 int ret; 1329 BDRVVmdkState *s = bs->opaque; 1330 qemu_co_mutex_lock(&s->lock); 1331 ret = vmdk_read(bs, sector_num, buf, nb_sectors); 1332 qemu_co_mutex_unlock(&s->lock); 1333 return ret; 1334 } 1335 1336 /** 1337 * vmdk_write: 1338 * @zeroed: buf is ignored (data is zero), use zeroed_grain GTE feature 1339 * if possible, otherwise return -ENOTSUP. 1340 * @zero_dry_run: used for zeroed == true only, don't update L2 table, just try 1341 * with each cluster. By dry run we can find if the zero write 1342 * is possible without modifying image data. 1343 * 1344 * Returns: error code with 0 for success. 1345 */ 1346 static int vmdk_write(BlockDriverState *bs, int64_t sector_num, 1347 const uint8_t *buf, int nb_sectors, 1348 bool zeroed, bool zero_dry_run) 1349 { 1350 BDRVVmdkState *s = bs->opaque; 1351 VmdkExtent *extent = NULL; 1352 int ret; 1353 int64_t index_in_cluster, n; 1354 uint64_t extent_begin_sector, extent_relative_sector_num; 1355 uint64_t cluster_offset; 1356 VmdkMetaData m_data; 1357 1358 if (sector_num > bs->total_sectors) { 1359 error_report("Wrong offset: sector_num=0x%" PRIx64 1360 " total_sectors=0x%" PRIx64 "\n", 1361 sector_num, bs->total_sectors); 1362 return -EIO; 1363 } 1364 1365 while (nb_sectors > 0) { 1366 extent = find_extent(s, sector_num, extent); 1367 if (!extent) { 1368 return -EIO; 1369 } 1370 ret = get_cluster_offset( 1371 bs, 1372 extent, 1373 &m_data, 1374 sector_num << 9, !extent->compressed, 1375 &cluster_offset); 1376 if (extent->compressed) { 1377 if (ret == VMDK_OK) { 1378 /* Refuse write to allocated cluster for streamOptimized */ 1379 error_report("Could not write to allocated cluster" 1380 " for streamOptimized"); 1381 return -EIO; 1382 } else { 1383 /* allocate */ 1384 ret = get_cluster_offset( 1385 bs, 1386 extent, 1387 &m_data, 1388 sector_num << 9, 1, 1389 &cluster_offset); 1390 } 1391 } 1392 if (ret == VMDK_ERROR) { 1393 return -EINVAL; 1394 } 1395 extent_begin_sector = extent->end_sector - extent->sectors; 1396 extent_relative_sector_num = sector_num - extent_begin_sector; 1397 index_in_cluster = extent_relative_sector_num % extent->cluster_sectors; 1398 n = extent->cluster_sectors - index_in_cluster; 1399 if (n > nb_sectors) { 1400 n = nb_sectors; 1401 } 1402 if (zeroed) { 1403 /* Do zeroed write, buf is ignored */ 1404 if (extent->has_zero_grain && 1405 index_in_cluster == 0 && 1406 n >= extent->cluster_sectors) { 1407 n = extent->cluster_sectors; 1408 if (!zero_dry_run) { 1409 m_data.offset = VMDK_GTE_ZEROED; 1410 /* update L2 tables */ 1411 if (vmdk_L2update(extent, &m_data) != VMDK_OK) { 1412 return -EIO; 1413 } 1414 } 1415 } else { 1416 return -ENOTSUP; 1417 } 1418 } else { 1419 ret = vmdk_write_extent(extent, 1420 cluster_offset, index_in_cluster * 512, 1421 buf, n, sector_num); 1422 if (ret) { 1423 return ret; 1424 } 1425 if (m_data.valid) { 1426 /* update L2 tables */ 1427 if (vmdk_L2update(extent, &m_data) != VMDK_OK) { 1428 return -EIO; 1429 } 1430 } 1431 } 1432 nb_sectors -= n; 1433 sector_num += n; 1434 buf += n * 512; 1435 1436 /* update CID on the first write every time the virtual disk is 1437 * opened */ 1438 if (!s->cid_updated) { 1439 ret = vmdk_write_cid(bs, time(NULL)); 1440 if (ret < 0) { 1441 return ret; 1442 } 1443 s->cid_updated = true; 1444 } 1445 } 1446 return 0; 1447 } 1448 1449 static coroutine_fn int vmdk_co_write(BlockDriverState *bs, int64_t sector_num, 1450 const uint8_t *buf, int nb_sectors) 1451 { 1452 int ret; 1453 BDRVVmdkState *s = bs->opaque; 1454 qemu_co_mutex_lock(&s->lock); 1455 ret = vmdk_write(bs, sector_num, buf, nb_sectors, false, false); 1456 qemu_co_mutex_unlock(&s->lock); 1457 return ret; 1458 } 1459 1460 static int coroutine_fn vmdk_co_write_zeroes(BlockDriverState *bs, 1461 int64_t sector_num, 1462 int nb_sectors, 1463 BdrvRequestFlags flags) 1464 { 1465 int ret; 1466 BDRVVmdkState *s = bs->opaque; 1467 qemu_co_mutex_lock(&s->lock); 1468 /* write zeroes could fail if sectors not aligned to cluster, test it with 1469 * dry_run == true before really updating image */ 1470 ret = vmdk_write(bs, sector_num, NULL, nb_sectors, true, true); 1471 if (!ret) { 1472 ret = vmdk_write(bs, sector_num, NULL, nb_sectors, true, false); 1473 } 1474 qemu_co_mutex_unlock(&s->lock); 1475 return ret; 1476 } 1477 1478 static int vmdk_create_extent(const char *filename, int64_t filesize, 1479 bool flat, bool compress, bool zeroed_grain, 1480 Error **errp) 1481 { 1482 int ret, i; 1483 BlockDriverState *bs = NULL; 1484 VMDK4Header header; 1485 Error *local_err; 1486 uint32_t tmp, magic, grains, gd_sectors, gt_size, gt_count; 1487 uint32_t *gd_buf = NULL; 1488 int gd_buf_size; 1489 1490 ret = bdrv_create_file(filename, NULL, &local_err); 1491 if (ret < 0) { 1492 error_propagate(errp, local_err); 1493 goto exit; 1494 } 1495 1496 ret = bdrv_file_open(&bs, filename, NULL, NULL, BDRV_O_RDWR, &local_err); 1497 if (ret < 0) { 1498 error_propagate(errp, local_err); 1499 goto exit; 1500 } 1501 1502 if (flat) { 1503 ret = bdrv_truncate(bs, filesize); 1504 if (ret < 0) { 1505 error_setg(errp, "Could not truncate file"); 1506 } 1507 goto exit; 1508 } 1509 magic = cpu_to_be32(VMDK4_MAGIC); 1510 memset(&header, 0, sizeof(header)); 1511 header.version = zeroed_grain ? 2 : 1; 1512 header.flags = VMDK4_FLAG_RGD | VMDK4_FLAG_NL_DETECT 1513 | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0) 1514 | (zeroed_grain ? VMDK4_FLAG_ZERO_GRAIN : 0); 1515 header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0; 1516 header.capacity = filesize / BDRV_SECTOR_SIZE; 1517 header.granularity = 128; 1518 header.num_gtes_per_gt = BDRV_SECTOR_SIZE; 1519 1520 grains = DIV_ROUND_UP(filesize / BDRV_SECTOR_SIZE, header.granularity); 1521 gt_size = DIV_ROUND_UP(header.num_gtes_per_gt * sizeof(uint32_t), 1522 BDRV_SECTOR_SIZE); 1523 gt_count = DIV_ROUND_UP(grains, header.num_gtes_per_gt); 1524 gd_sectors = DIV_ROUND_UP(gt_count * sizeof(uint32_t), BDRV_SECTOR_SIZE); 1525 1526 header.desc_offset = 1; 1527 header.desc_size = 20; 1528 header.rgd_offset = header.desc_offset + header.desc_size; 1529 header.gd_offset = header.rgd_offset + gd_sectors + (gt_size * gt_count); 1530 header.grain_offset = 1531 ROUND_UP(header.gd_offset + gd_sectors + (gt_size * gt_count), 1532 header.granularity); 1533 /* swap endianness for all header fields */ 1534 header.version = cpu_to_le32(header.version); 1535 header.flags = cpu_to_le32(header.flags); 1536 header.capacity = cpu_to_le64(header.capacity); 1537 header.granularity = cpu_to_le64(header.granularity); 1538 header.num_gtes_per_gt = cpu_to_le32(header.num_gtes_per_gt); 1539 header.desc_offset = cpu_to_le64(header.desc_offset); 1540 header.desc_size = cpu_to_le64(header.desc_size); 1541 header.rgd_offset = cpu_to_le64(header.rgd_offset); 1542 header.gd_offset = cpu_to_le64(header.gd_offset); 1543 header.grain_offset = cpu_to_le64(header.grain_offset); 1544 header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm); 1545 1546 header.check_bytes[0] = 0xa; 1547 header.check_bytes[1] = 0x20; 1548 header.check_bytes[2] = 0xd; 1549 header.check_bytes[3] = 0xa; 1550 1551 /* write all the data */ 1552 ret = bdrv_pwrite(bs, 0, &magic, sizeof(magic)); 1553 if (ret < 0) { 1554 error_set(errp, QERR_IO_ERROR); 1555 goto exit; 1556 } 1557 ret = bdrv_pwrite(bs, sizeof(magic), &header, sizeof(header)); 1558 if (ret < 0) { 1559 error_set(errp, QERR_IO_ERROR); 1560 goto exit; 1561 } 1562 1563 ret = bdrv_truncate(bs, le64_to_cpu(header.grain_offset) << 9); 1564 if (ret < 0) { 1565 error_setg(errp, "Could not truncate file"); 1566 goto exit; 1567 } 1568 1569 /* write grain directory */ 1570 gd_buf_size = gd_sectors * BDRV_SECTOR_SIZE; 1571 gd_buf = g_malloc0(gd_buf_size); 1572 for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_sectors; 1573 i < gt_count; i++, tmp += gt_size) { 1574 gd_buf[i] = cpu_to_le32(tmp); 1575 } 1576 ret = bdrv_pwrite(bs, le64_to_cpu(header.rgd_offset) * BDRV_SECTOR_SIZE, 1577 gd_buf, gd_buf_size); 1578 if (ret < 0) { 1579 error_set(errp, QERR_IO_ERROR); 1580 goto exit; 1581 } 1582 1583 /* write backup grain directory */ 1584 for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_sectors; 1585 i < gt_count; i++, tmp += gt_size) { 1586 gd_buf[i] = cpu_to_le32(tmp); 1587 } 1588 ret = bdrv_pwrite(bs, le64_to_cpu(header.gd_offset) * BDRV_SECTOR_SIZE, 1589 gd_buf, gd_buf_size); 1590 if (ret < 0) { 1591 error_set(errp, QERR_IO_ERROR); 1592 goto exit; 1593 } 1594 1595 ret = 0; 1596 exit: 1597 if (bs) { 1598 bdrv_unref(bs); 1599 } 1600 g_free(gd_buf); 1601 return ret; 1602 } 1603 1604 static int filename_decompose(const char *filename, char *path, char *prefix, 1605 char *postfix, size_t buf_len, Error **errp) 1606 { 1607 const char *p, *q; 1608 1609 if (filename == NULL || !strlen(filename)) { 1610 error_setg(errp, "No filename provided"); 1611 return VMDK_ERROR; 1612 } 1613 p = strrchr(filename, '/'); 1614 if (p == NULL) { 1615 p = strrchr(filename, '\\'); 1616 } 1617 if (p == NULL) { 1618 p = strrchr(filename, ':'); 1619 } 1620 if (p != NULL) { 1621 p++; 1622 if (p - filename >= buf_len) { 1623 return VMDK_ERROR; 1624 } 1625 pstrcpy(path, p - filename + 1, filename); 1626 } else { 1627 p = filename; 1628 path[0] = '\0'; 1629 } 1630 q = strrchr(p, '.'); 1631 if (q == NULL) { 1632 pstrcpy(prefix, buf_len, p); 1633 postfix[0] = '\0'; 1634 } else { 1635 if (q - p >= buf_len) { 1636 return VMDK_ERROR; 1637 } 1638 pstrcpy(prefix, q - p + 1, p); 1639 pstrcpy(postfix, buf_len, q); 1640 } 1641 return VMDK_OK; 1642 } 1643 1644 static int vmdk_create(const char *filename, QEMUOptionParameter *options, 1645 Error **errp) 1646 { 1647 int idx = 0; 1648 BlockDriverState *new_bs = NULL; 1649 Error *local_err; 1650 char *desc = NULL; 1651 int64_t total_size = 0, filesize; 1652 const char *adapter_type = NULL; 1653 const char *backing_file = NULL; 1654 const char *fmt = NULL; 1655 int flags = 0; 1656 int ret = 0; 1657 bool flat, split, compress; 1658 GString *ext_desc_lines; 1659 char path[PATH_MAX], prefix[PATH_MAX], postfix[PATH_MAX]; 1660 const int64_t split_size = 0x80000000; /* VMDK has constant split size */ 1661 const char *desc_extent_line; 1662 char parent_desc_line[BUF_SIZE] = ""; 1663 uint32_t parent_cid = 0xffffffff; 1664 uint32_t number_heads = 16; 1665 bool zeroed_grain = false; 1666 uint32_t desc_offset = 0, desc_len; 1667 const char desc_template[] = 1668 "# Disk DescriptorFile\n" 1669 "version=1\n" 1670 "CID=%x\n" 1671 "parentCID=%x\n" 1672 "createType=\"%s\"\n" 1673 "%s" 1674 "\n" 1675 "# Extent description\n" 1676 "%s" 1677 "\n" 1678 "# The Disk Data Base\n" 1679 "#DDB\n" 1680 "\n" 1681 "ddb.virtualHWVersion = \"%d\"\n" 1682 "ddb.geometry.cylinders = \"%" PRId64 "\"\n" 1683 "ddb.geometry.heads = \"%d\"\n" 1684 "ddb.geometry.sectors = \"63\"\n" 1685 "ddb.adapterType = \"%s\"\n"; 1686 1687 ext_desc_lines = g_string_new(NULL); 1688 1689 if (filename_decompose(filename, path, prefix, postfix, PATH_MAX, errp)) { 1690 ret = -EINVAL; 1691 goto exit; 1692 } 1693 /* Read out options */ 1694 while (options && options->name) { 1695 if (!strcmp(options->name, BLOCK_OPT_SIZE)) { 1696 total_size = options->value.n; 1697 } else if (!strcmp(options->name, BLOCK_OPT_ADAPTER_TYPE)) { 1698 adapter_type = options->value.s; 1699 } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { 1700 backing_file = options->value.s; 1701 } else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { 1702 flags |= options->value.n ? BLOCK_FLAG_COMPAT6 : 0; 1703 } else if (!strcmp(options->name, BLOCK_OPT_SUBFMT)) { 1704 fmt = options->value.s; 1705 } else if (!strcmp(options->name, BLOCK_OPT_ZEROED_GRAIN)) { 1706 zeroed_grain |= options->value.n; 1707 } 1708 options++; 1709 } 1710 if (!adapter_type) { 1711 adapter_type = "ide"; 1712 } else if (strcmp(adapter_type, "ide") && 1713 strcmp(adapter_type, "buslogic") && 1714 strcmp(adapter_type, "lsilogic") && 1715 strcmp(adapter_type, "legacyESX")) { 1716 error_setg(errp, "Unknown adapter type: '%s'", adapter_type); 1717 ret = -EINVAL; 1718 goto exit; 1719 } 1720 if (strcmp(adapter_type, "ide") != 0) { 1721 /* that's the number of heads with which vmware operates when 1722 creating, exporting, etc. vmdk files with a non-ide adapter type */ 1723 number_heads = 255; 1724 } 1725 if (!fmt) { 1726 /* Default format to monolithicSparse */ 1727 fmt = "monolithicSparse"; 1728 } else if (strcmp(fmt, "monolithicFlat") && 1729 strcmp(fmt, "monolithicSparse") && 1730 strcmp(fmt, "twoGbMaxExtentSparse") && 1731 strcmp(fmt, "twoGbMaxExtentFlat") && 1732 strcmp(fmt, "streamOptimized")) { 1733 error_setg(errp, "Unknown subformat: '%s'", fmt); 1734 ret = -EINVAL; 1735 goto exit; 1736 } 1737 split = !(strcmp(fmt, "twoGbMaxExtentFlat") && 1738 strcmp(fmt, "twoGbMaxExtentSparse")); 1739 flat = !(strcmp(fmt, "monolithicFlat") && 1740 strcmp(fmt, "twoGbMaxExtentFlat")); 1741 compress = !strcmp(fmt, "streamOptimized"); 1742 if (flat) { 1743 desc_extent_line = "RW %lld FLAT \"%s\" 0\n"; 1744 } else { 1745 desc_extent_line = "RW %lld SPARSE \"%s\"\n"; 1746 } 1747 if (flat && backing_file) { 1748 error_setg(errp, "Flat image can't have backing file"); 1749 ret = -ENOTSUP; 1750 goto exit; 1751 } 1752 if (flat && zeroed_grain) { 1753 error_setg(errp, "Flat image can't enable zeroed grain"); 1754 ret = -ENOTSUP; 1755 goto exit; 1756 } 1757 if (backing_file) { 1758 BlockDriverState *bs = bdrv_new(""); 1759 ret = bdrv_open(bs, backing_file, NULL, BDRV_O_NO_BACKING, NULL, errp); 1760 if (ret != 0) { 1761 bdrv_unref(bs); 1762 goto exit; 1763 } 1764 if (strcmp(bs->drv->format_name, "vmdk")) { 1765 bdrv_unref(bs); 1766 ret = -EINVAL; 1767 goto exit; 1768 } 1769 parent_cid = vmdk_read_cid(bs, 0); 1770 bdrv_unref(bs); 1771 snprintf(parent_desc_line, sizeof(parent_desc_line), 1772 "parentFileNameHint=\"%s\"", backing_file); 1773 } 1774 1775 /* Create extents */ 1776 filesize = total_size; 1777 while (filesize > 0) { 1778 char desc_line[BUF_SIZE]; 1779 char ext_filename[PATH_MAX]; 1780 char desc_filename[PATH_MAX]; 1781 int64_t size = filesize; 1782 1783 if (split && size > split_size) { 1784 size = split_size; 1785 } 1786 if (split) { 1787 snprintf(desc_filename, sizeof(desc_filename), "%s-%c%03d%s", 1788 prefix, flat ? 'f' : 's', ++idx, postfix); 1789 } else if (flat) { 1790 snprintf(desc_filename, sizeof(desc_filename), "%s-flat%s", 1791 prefix, postfix); 1792 } else { 1793 snprintf(desc_filename, sizeof(desc_filename), "%s%s", 1794 prefix, postfix); 1795 } 1796 snprintf(ext_filename, sizeof(ext_filename), "%s%s", 1797 path, desc_filename); 1798 1799 if (vmdk_create_extent(ext_filename, size, 1800 flat, compress, zeroed_grain, errp)) { 1801 ret = -EINVAL; 1802 goto exit; 1803 } 1804 filesize -= size; 1805 1806 /* Format description line */ 1807 snprintf(desc_line, sizeof(desc_line), 1808 desc_extent_line, size / BDRV_SECTOR_SIZE, desc_filename); 1809 g_string_append(ext_desc_lines, desc_line); 1810 } 1811 /* generate descriptor file */ 1812 desc = g_strdup_printf(desc_template, 1813 (unsigned int)time(NULL), 1814 parent_cid, 1815 fmt, 1816 parent_desc_line, 1817 ext_desc_lines->str, 1818 (flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), 1819 total_size / 1820 (int64_t)(63 * number_heads * BDRV_SECTOR_SIZE), 1821 number_heads, 1822 adapter_type); 1823 desc_len = strlen(desc); 1824 /* the descriptor offset = 0x200 */ 1825 if (!split && !flat) { 1826 desc_offset = 0x200; 1827 } else { 1828 ret = bdrv_create_file(filename, options, &local_err); 1829 if (ret < 0) { 1830 error_setg_errno(errp, -ret, "Could not create image file"); 1831 goto exit; 1832 } 1833 } 1834 ret = bdrv_file_open(&new_bs, filename, NULL, NULL, BDRV_O_RDWR, &local_err); 1835 if (ret < 0) { 1836 error_setg_errno(errp, -ret, "Could not write description"); 1837 goto exit; 1838 } 1839 ret = bdrv_pwrite(new_bs, desc_offset, desc, desc_len); 1840 if (ret < 0) { 1841 error_setg_errno(errp, -ret, "Could not write description"); 1842 goto exit; 1843 } 1844 /* bdrv_pwrite write padding zeros to align to sector, we don't need that 1845 * for description file */ 1846 if (desc_offset == 0) { 1847 ret = bdrv_truncate(new_bs, desc_len); 1848 if (ret < 0) { 1849 error_setg(errp, "Could not truncate file"); 1850 } 1851 } 1852 exit: 1853 if (new_bs) { 1854 bdrv_unref(new_bs); 1855 } 1856 g_free(desc); 1857 g_string_free(ext_desc_lines, true); 1858 return ret; 1859 } 1860 1861 static void vmdk_close(BlockDriverState *bs) 1862 { 1863 BDRVVmdkState *s = bs->opaque; 1864 1865 vmdk_free_extents(bs); 1866 g_free(s->create_type); 1867 1868 migrate_del_blocker(s->migration_blocker); 1869 error_free(s->migration_blocker); 1870 } 1871 1872 static coroutine_fn int vmdk_co_flush(BlockDriverState *bs) 1873 { 1874 BDRVVmdkState *s = bs->opaque; 1875 int i, err; 1876 int ret = 0; 1877 1878 for (i = 0; i < s->num_extents; i++) { 1879 err = bdrv_co_flush(s->extents[i].file); 1880 if (err < 0) { 1881 ret = err; 1882 } 1883 } 1884 return ret; 1885 } 1886 1887 static int64_t vmdk_get_allocated_file_size(BlockDriverState *bs) 1888 { 1889 int i; 1890 int64_t ret = 0; 1891 int64_t r; 1892 BDRVVmdkState *s = bs->opaque; 1893 1894 ret = bdrv_get_allocated_file_size(bs->file); 1895 if (ret < 0) { 1896 return ret; 1897 } 1898 for (i = 0; i < s->num_extents; i++) { 1899 if (s->extents[i].file == bs->file) { 1900 continue; 1901 } 1902 r = bdrv_get_allocated_file_size(s->extents[i].file); 1903 if (r < 0) { 1904 return r; 1905 } 1906 ret += r; 1907 } 1908 return ret; 1909 } 1910 1911 static int vmdk_has_zero_init(BlockDriverState *bs) 1912 { 1913 int i; 1914 BDRVVmdkState *s = bs->opaque; 1915 1916 /* If has a flat extent and its underlying storage doesn't have zero init, 1917 * return 0. */ 1918 for (i = 0; i < s->num_extents; i++) { 1919 if (s->extents[i].flat) { 1920 if (!bdrv_has_zero_init(s->extents[i].file)) { 1921 return 0; 1922 } 1923 } 1924 } 1925 return 1; 1926 } 1927 1928 static ImageInfo *vmdk_get_extent_info(VmdkExtent *extent) 1929 { 1930 ImageInfo *info = g_new0(ImageInfo, 1); 1931 1932 *info = (ImageInfo){ 1933 .filename = g_strdup(extent->file->filename), 1934 .format = g_strdup(extent->type), 1935 .virtual_size = extent->sectors * BDRV_SECTOR_SIZE, 1936 .compressed = extent->compressed, 1937 .has_compressed = extent->compressed, 1938 .cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE, 1939 .has_cluster_size = !extent->flat, 1940 }; 1941 1942 return info; 1943 } 1944 1945 static int vmdk_check(BlockDriverState *bs, BdrvCheckResult *result, 1946 BdrvCheckMode fix) 1947 { 1948 BDRVVmdkState *s = bs->opaque; 1949 VmdkExtent *extent = NULL; 1950 int64_t sector_num = 0; 1951 int64_t total_sectors = bdrv_getlength(bs) / BDRV_SECTOR_SIZE; 1952 int ret; 1953 uint64_t cluster_offset; 1954 1955 if (fix) { 1956 return -ENOTSUP; 1957 } 1958 1959 for (;;) { 1960 if (sector_num >= total_sectors) { 1961 return 0; 1962 } 1963 extent = find_extent(s, sector_num, extent); 1964 if (!extent) { 1965 fprintf(stderr, 1966 "ERROR: could not find extent for sector %" PRId64 "\n", 1967 sector_num); 1968 break; 1969 } 1970 ret = get_cluster_offset(bs, extent, NULL, 1971 sector_num << BDRV_SECTOR_BITS, 1972 0, &cluster_offset); 1973 if (ret == VMDK_ERROR) { 1974 fprintf(stderr, 1975 "ERROR: could not get cluster_offset for sector %" 1976 PRId64 "\n", sector_num); 1977 break; 1978 } 1979 if (ret == VMDK_OK && cluster_offset >= bdrv_getlength(extent->file)) { 1980 fprintf(stderr, 1981 "ERROR: cluster offset for sector %" 1982 PRId64 " points after EOF\n", sector_num); 1983 break; 1984 } 1985 sector_num += extent->cluster_sectors; 1986 } 1987 1988 result->corruptions++; 1989 return 0; 1990 } 1991 1992 static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs) 1993 { 1994 int i; 1995 BDRVVmdkState *s = bs->opaque; 1996 ImageInfoSpecific *spec_info = g_new0(ImageInfoSpecific, 1); 1997 ImageInfoList **next; 1998 1999 *spec_info = (ImageInfoSpecific){ 2000 .kind = IMAGE_INFO_SPECIFIC_KIND_VMDK, 2001 { 2002 .vmdk = g_new0(ImageInfoSpecificVmdk, 1), 2003 }, 2004 }; 2005 2006 *spec_info->vmdk = (ImageInfoSpecificVmdk) { 2007 .create_type = g_strdup(s->create_type), 2008 .cid = s->cid, 2009 .parent_cid = s->parent_cid, 2010 }; 2011 2012 next = &spec_info->vmdk->extents; 2013 for (i = 0; i < s->num_extents; i++) { 2014 *next = g_new0(ImageInfoList, 1); 2015 (*next)->value = vmdk_get_extent_info(&s->extents[i]); 2016 (*next)->next = NULL; 2017 next = &(*next)->next; 2018 } 2019 2020 return spec_info; 2021 } 2022 2023 static QEMUOptionParameter vmdk_create_options[] = { 2024 { 2025 .name = BLOCK_OPT_SIZE, 2026 .type = OPT_SIZE, 2027 .help = "Virtual disk size" 2028 }, 2029 { 2030 .name = BLOCK_OPT_ADAPTER_TYPE, 2031 .type = OPT_STRING, 2032 .help = "Virtual adapter type, can be one of " 2033 "ide (default), lsilogic, buslogic or legacyESX" 2034 }, 2035 { 2036 .name = BLOCK_OPT_BACKING_FILE, 2037 .type = OPT_STRING, 2038 .help = "File name of a base image" 2039 }, 2040 { 2041 .name = BLOCK_OPT_COMPAT6, 2042 .type = OPT_FLAG, 2043 .help = "VMDK version 6 image" 2044 }, 2045 { 2046 .name = BLOCK_OPT_SUBFMT, 2047 .type = OPT_STRING, 2048 .help = 2049 "VMDK flat extent format, can be one of " 2050 "{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} " 2051 }, 2052 { 2053 .name = BLOCK_OPT_ZEROED_GRAIN, 2054 .type = OPT_FLAG, 2055 .help = "Enable efficient zero writes using the zeroed-grain GTE feature" 2056 }, 2057 { NULL } 2058 }; 2059 2060 static BlockDriver bdrv_vmdk = { 2061 .format_name = "vmdk", 2062 .instance_size = sizeof(BDRVVmdkState), 2063 .bdrv_probe = vmdk_probe, 2064 .bdrv_open = vmdk_open, 2065 .bdrv_check = vmdk_check, 2066 .bdrv_reopen_prepare = vmdk_reopen_prepare, 2067 .bdrv_read = vmdk_co_read, 2068 .bdrv_write = vmdk_co_write, 2069 .bdrv_co_write_zeroes = vmdk_co_write_zeroes, 2070 .bdrv_close = vmdk_close, 2071 .bdrv_create = vmdk_create, 2072 .bdrv_co_flush_to_disk = vmdk_co_flush, 2073 .bdrv_co_get_block_status = vmdk_co_get_block_status, 2074 .bdrv_get_allocated_file_size = vmdk_get_allocated_file_size, 2075 .bdrv_has_zero_init = vmdk_has_zero_init, 2076 .bdrv_get_specific_info = vmdk_get_specific_info, 2077 .bdrv_refresh_limits = vmdk_refresh_limits, 2078 2079 .create_options = vmdk_create_options, 2080 }; 2081 2082 static void bdrv_vmdk_init(void) 2083 { 2084 bdrv_register(&bdrv_vmdk); 2085 } 2086 2087 block_init(bdrv_vmdk_init); 2088