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, "%" SCNx32, &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), "%" PRIx32 "\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, char *buf, 530 Error **errp); 531 532 static char *vmdk_read_desc(BlockDriverState *file, uint64_t desc_offset, 533 Error **errp) 534 { 535 int64_t size; 536 char *buf; 537 int ret; 538 539 size = bdrv_getlength(file); 540 if (size < 0) { 541 error_setg_errno(errp, -size, "Could not access file"); 542 return NULL; 543 } 544 545 size = MIN(size, 1 << 20); /* avoid unbounded allocation */ 546 buf = g_malloc0(size + 1); 547 548 ret = bdrv_pread(file, desc_offset, buf, size); 549 if (ret < 0) { 550 error_setg_errno(errp, -ret, "Could not read from file"); 551 g_free(buf); 552 return NULL; 553 } 554 555 return buf; 556 } 557 558 static int vmdk_open_vmdk4(BlockDriverState *bs, 559 BlockDriverState *file, 560 int flags, Error **errp) 561 { 562 int ret; 563 uint32_t magic; 564 uint32_t l1_size, l1_entry_sectors; 565 VMDK4Header header; 566 VmdkExtent *extent; 567 BDRVVmdkState *s = bs->opaque; 568 int64_t l1_backup_offset = 0; 569 570 ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); 571 if (ret < 0) { 572 error_setg_errno(errp, -ret, 573 "Could not read header from file '%s'", 574 file->filename); 575 return -EINVAL; 576 } 577 if (header.capacity == 0) { 578 uint64_t desc_offset = le64_to_cpu(header.desc_offset); 579 if (desc_offset) { 580 char *buf = vmdk_read_desc(file, desc_offset << 9, errp); 581 if (!buf) { 582 return -EINVAL; 583 } 584 ret = vmdk_open_desc_file(bs, flags, buf, errp); 585 g_free(buf); 586 return ret; 587 } 588 } 589 590 if (!s->create_type) { 591 s->create_type = g_strdup("monolithicSparse"); 592 } 593 594 if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) { 595 /* 596 * The footer takes precedence over the header, so read it in. The 597 * footer starts at offset -1024 from the end: One sector for the 598 * footer, and another one for the end-of-stream marker. 599 */ 600 struct { 601 struct { 602 uint64_t val; 603 uint32_t size; 604 uint32_t type; 605 uint8_t pad[512 - 16]; 606 } QEMU_PACKED footer_marker; 607 608 uint32_t magic; 609 VMDK4Header header; 610 uint8_t pad[512 - 4 - sizeof(VMDK4Header)]; 611 612 struct { 613 uint64_t val; 614 uint32_t size; 615 uint32_t type; 616 uint8_t pad[512 - 16]; 617 } QEMU_PACKED eos_marker; 618 } QEMU_PACKED footer; 619 620 ret = bdrv_pread(file, 621 bs->file->total_sectors * 512 - 1536, 622 &footer, sizeof(footer)); 623 if (ret < 0) { 624 return ret; 625 } 626 627 /* Some sanity checks for the footer */ 628 if (be32_to_cpu(footer.magic) != VMDK4_MAGIC || 629 le32_to_cpu(footer.footer_marker.size) != 0 || 630 le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER || 631 le64_to_cpu(footer.eos_marker.val) != 0 || 632 le32_to_cpu(footer.eos_marker.size) != 0 || 633 le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM) 634 { 635 return -EINVAL; 636 } 637 638 header = footer.header; 639 } 640 641 if (le32_to_cpu(header.version) > 3) { 642 char buf[64]; 643 snprintf(buf, sizeof(buf), "VMDK version %" PRId32, 644 le32_to_cpu(header.version)); 645 error_set(errp, QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, 646 bs->device_name, "vmdk", buf); 647 return -ENOTSUP; 648 } else if (le32_to_cpu(header.version) == 3 && (flags & BDRV_O_RDWR)) { 649 /* VMware KB 2064959 explains that version 3 added support for 650 * persistent changed block tracking (CBT), and backup software can 651 * read it as version=1 if it doesn't care about the changed area 652 * information. So we are safe to enable read only. */ 653 error_setg(errp, "VMDK version 3 must be read only"); 654 return -EINVAL; 655 } 656 657 if (le32_to_cpu(header.num_gtes_per_gt) > 512) { 658 error_setg(errp, "L2 table size too big"); 659 return -EINVAL; 660 } 661 662 l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gt) 663 * le64_to_cpu(header.granularity); 664 if (l1_entry_sectors == 0) { 665 return -EINVAL; 666 } 667 l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1) 668 / l1_entry_sectors; 669 if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) { 670 l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9; 671 } 672 if (bdrv_getlength(file) < 673 le64_to_cpu(header.grain_offset) * BDRV_SECTOR_SIZE) { 674 error_setg(errp, "File truncated, expecting at least %" PRId64 " bytes", 675 (int64_t)(le64_to_cpu(header.grain_offset) 676 * BDRV_SECTOR_SIZE)); 677 return -EINVAL; 678 } 679 680 ret = vmdk_add_extent(bs, file, false, 681 le64_to_cpu(header.capacity), 682 le64_to_cpu(header.gd_offset) << 9, 683 l1_backup_offset, 684 l1_size, 685 le32_to_cpu(header.num_gtes_per_gt), 686 le64_to_cpu(header.granularity), 687 &extent, 688 errp); 689 if (ret < 0) { 690 return ret; 691 } 692 extent->compressed = 693 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; 694 if (extent->compressed) { 695 g_free(s->create_type); 696 s->create_type = g_strdup("streamOptimized"); 697 } 698 extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER; 699 extent->version = le32_to_cpu(header.version); 700 extent->has_zero_grain = le32_to_cpu(header.flags) & VMDK4_FLAG_ZERO_GRAIN; 701 ret = vmdk_init_tables(bs, extent, errp); 702 if (ret) { 703 /* free extent allocated by vmdk_add_extent */ 704 vmdk_free_last_extent(bs); 705 } 706 return ret; 707 } 708 709 /* find an option value out of descriptor file */ 710 static int vmdk_parse_description(const char *desc, const char *opt_name, 711 char *buf, int buf_size) 712 { 713 char *opt_pos, *opt_end; 714 const char *end = desc + strlen(desc); 715 716 opt_pos = strstr(desc, opt_name); 717 if (!opt_pos) { 718 return VMDK_ERROR; 719 } 720 /* Skip "=\"" following opt_name */ 721 opt_pos += strlen(opt_name) + 2; 722 if (opt_pos >= end) { 723 return VMDK_ERROR; 724 } 725 opt_end = opt_pos; 726 while (opt_end < end && *opt_end != '"') { 727 opt_end++; 728 } 729 if (opt_end == end || buf_size < opt_end - opt_pos + 1) { 730 return VMDK_ERROR; 731 } 732 pstrcpy(buf, opt_end - opt_pos + 1, opt_pos); 733 return VMDK_OK; 734 } 735 736 /* Open an extent file and append to bs array */ 737 static int vmdk_open_sparse(BlockDriverState *bs, 738 BlockDriverState *file, int flags, 739 char *buf, Error **errp) 740 { 741 uint32_t magic; 742 743 magic = ldl_be_p(buf); 744 switch (magic) { 745 case VMDK3_MAGIC: 746 return vmdk_open_vmfs_sparse(bs, file, flags, errp); 747 break; 748 case VMDK4_MAGIC: 749 return vmdk_open_vmdk4(bs, file, flags, errp); 750 break; 751 default: 752 error_setg(errp, "Image not in VMDK format"); 753 return -EINVAL; 754 break; 755 } 756 } 757 758 static int vmdk_parse_extents(const char *desc, BlockDriverState *bs, 759 const char *desc_file_path, Error **errp) 760 { 761 int ret; 762 char access[11]; 763 char type[11]; 764 char fname[512]; 765 const char *p = desc; 766 int64_t sectors = 0; 767 int64_t flat_offset; 768 char extent_path[PATH_MAX]; 769 BlockDriverState *extent_file; 770 BDRVVmdkState *s = bs->opaque; 771 VmdkExtent *extent; 772 773 while (*p) { 774 /* parse extent line: 775 * RW [size in sectors] FLAT "file-name.vmdk" OFFSET 776 * or 777 * RW [size in sectors] SPARSE "file-name.vmdk" 778 */ 779 flat_offset = -1; 780 ret = sscanf(p, "%10s %" SCNd64 " %10s \"%511[^\n\r\"]\" %" SCNd64, 781 access, §ors, type, fname, &flat_offset); 782 if (ret < 4 || strcmp(access, "RW")) { 783 goto next_line; 784 } else if (!strcmp(type, "FLAT")) { 785 if (ret != 5 || flat_offset < 0) { 786 error_setg(errp, "Invalid extent lines: \n%s", p); 787 return -EINVAL; 788 } 789 } else if (!strcmp(type, "VMFS")) { 790 if (ret == 4) { 791 flat_offset = 0; 792 } else { 793 error_setg(errp, "Invalid extent lines:\n%s", p); 794 return -EINVAL; 795 } 796 } else if (ret != 4) { 797 error_setg(errp, "Invalid extent lines:\n%s", p); 798 return -EINVAL; 799 } 800 801 if (sectors <= 0 || 802 (strcmp(type, "FLAT") && strcmp(type, "SPARSE") && 803 strcmp(type, "VMFS") && strcmp(type, "VMFSSPARSE")) || 804 (strcmp(access, "RW"))) { 805 goto next_line; 806 } 807 808 path_combine(extent_path, sizeof(extent_path), 809 desc_file_path, fname); 810 extent_file = NULL; 811 ret = bdrv_open(&extent_file, extent_path, NULL, NULL, 812 bs->open_flags | BDRV_O_PROTOCOL, NULL, errp); 813 if (ret) { 814 return ret; 815 } 816 817 /* save to extents array */ 818 if (!strcmp(type, "FLAT") || !strcmp(type, "VMFS")) { 819 /* FLAT extent */ 820 821 ret = vmdk_add_extent(bs, extent_file, true, sectors, 822 0, 0, 0, 0, 0, &extent, errp); 823 if (ret < 0) { 824 return ret; 825 } 826 extent->flat_start_offset = flat_offset << 9; 827 } else if (!strcmp(type, "SPARSE") || !strcmp(type, "VMFSSPARSE")) { 828 /* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/ 829 char *buf = vmdk_read_desc(extent_file, 0, errp); 830 if (!buf) { 831 ret = -EINVAL; 832 } else { 833 ret = vmdk_open_sparse(bs, extent_file, bs->open_flags, buf, errp); 834 } 835 if (ret) { 836 g_free(buf); 837 bdrv_unref(extent_file); 838 return ret; 839 } 840 extent = &s->extents[s->num_extents - 1]; 841 } else { 842 error_setg(errp, "Unsupported extent type '%s'", type); 843 return -ENOTSUP; 844 } 845 extent->type = g_strdup(type); 846 next_line: 847 /* move to next line */ 848 while (*p) { 849 if (*p == '\n') { 850 p++; 851 break; 852 } 853 p++; 854 } 855 } 856 return 0; 857 } 858 859 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf, 860 Error **errp) 861 { 862 int ret; 863 char ct[128]; 864 BDRVVmdkState *s = bs->opaque; 865 866 if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) { 867 error_setg(errp, "invalid VMDK image descriptor"); 868 ret = -EINVAL; 869 goto exit; 870 } 871 if (strcmp(ct, "monolithicFlat") && 872 strcmp(ct, "vmfs") && 873 strcmp(ct, "vmfsSparse") && 874 strcmp(ct, "twoGbMaxExtentSparse") && 875 strcmp(ct, "twoGbMaxExtentFlat")) { 876 error_setg(errp, "Unsupported image type '%s'", ct); 877 ret = -ENOTSUP; 878 goto exit; 879 } 880 s->create_type = g_strdup(ct); 881 s->desc_offset = 0; 882 ret = vmdk_parse_extents(buf, bs, bs->file->filename, errp); 883 exit: 884 return ret; 885 } 886 887 static int vmdk_open(BlockDriverState *bs, QDict *options, int flags, 888 Error **errp) 889 { 890 char *buf = NULL; 891 int ret; 892 BDRVVmdkState *s = bs->opaque; 893 uint32_t magic; 894 895 buf = vmdk_read_desc(bs->file, 0, errp); 896 if (!buf) { 897 return -EINVAL; 898 } 899 900 magic = ldl_be_p(buf); 901 switch (magic) { 902 case VMDK3_MAGIC: 903 case VMDK4_MAGIC: 904 ret = vmdk_open_sparse(bs, bs->file, flags, buf, errp); 905 s->desc_offset = 0x200; 906 break; 907 default: 908 ret = vmdk_open_desc_file(bs, flags, buf, errp); 909 break; 910 } 911 if (ret) { 912 goto fail; 913 } 914 915 /* try to open parent images, if exist */ 916 ret = vmdk_parent_open(bs); 917 if (ret) { 918 goto fail; 919 } 920 s->cid = vmdk_read_cid(bs, 0); 921 s->parent_cid = vmdk_read_cid(bs, 1); 922 qemu_co_mutex_init(&s->lock); 923 924 /* Disable migration when VMDK images are used */ 925 error_set(&s->migration_blocker, 926 QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 927 "vmdk", bs->device_name, "live migration"); 928 migrate_add_blocker(s->migration_blocker); 929 g_free(buf); 930 return 0; 931 932 fail: 933 g_free(buf); 934 g_free(s->create_type); 935 s->create_type = NULL; 936 vmdk_free_extents(bs); 937 return ret; 938 } 939 940 941 static void vmdk_refresh_limits(BlockDriverState *bs, Error **errp) 942 { 943 BDRVVmdkState *s = bs->opaque; 944 int i; 945 946 for (i = 0; i < s->num_extents; i++) { 947 if (!s->extents[i].flat) { 948 bs->bl.write_zeroes_alignment = 949 MAX(bs->bl.write_zeroes_alignment, 950 s->extents[i].cluster_sectors); 951 } 952 } 953 } 954 955 static int get_whole_cluster(BlockDriverState *bs, 956 VmdkExtent *extent, 957 uint64_t cluster_offset, 958 uint64_t offset, 959 bool allocate) 960 { 961 int ret = VMDK_OK; 962 uint8_t *whole_grain = NULL; 963 964 /* we will be here if it's first write on non-exist grain(cluster). 965 * try to read from parent image, if exist */ 966 if (bs->backing_hd) { 967 whole_grain = 968 qemu_blockalign(bs, extent->cluster_sectors << BDRV_SECTOR_BITS); 969 if (!vmdk_is_cid_valid(bs)) { 970 ret = VMDK_ERROR; 971 goto exit; 972 } 973 974 /* floor offset to cluster */ 975 offset -= offset % (extent->cluster_sectors * 512); 976 ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain, 977 extent->cluster_sectors); 978 if (ret < 0) { 979 ret = VMDK_ERROR; 980 goto exit; 981 } 982 983 /* Write grain only into the active image */ 984 ret = bdrv_write(extent->file, cluster_offset, whole_grain, 985 extent->cluster_sectors); 986 if (ret < 0) { 987 ret = VMDK_ERROR; 988 goto exit; 989 } 990 } 991 exit: 992 qemu_vfree(whole_grain); 993 return ret; 994 } 995 996 static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) 997 { 998 uint32_t offset; 999 QEMU_BUILD_BUG_ON(sizeof(offset) != sizeof(m_data->offset)); 1000 offset = cpu_to_le32(m_data->offset); 1001 /* update L2 table */ 1002 if (bdrv_pwrite_sync( 1003 extent->file, 1004 ((int64_t)m_data->l2_offset * 512) 1005 + (m_data->l2_index * sizeof(m_data->offset)), 1006 &offset, sizeof(offset)) < 0) { 1007 return VMDK_ERROR; 1008 } 1009 /* update backup L2 table */ 1010 if (extent->l1_backup_table_offset != 0) { 1011 m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; 1012 if (bdrv_pwrite_sync( 1013 extent->file, 1014 ((int64_t)m_data->l2_offset * 512) 1015 + (m_data->l2_index * sizeof(m_data->offset)), 1016 &offset, sizeof(offset)) < 0) { 1017 return VMDK_ERROR; 1018 } 1019 } 1020 if (m_data->l2_cache_entry) { 1021 *m_data->l2_cache_entry = offset; 1022 } 1023 1024 return VMDK_OK; 1025 } 1026 1027 static int get_cluster_offset(BlockDriverState *bs, 1028 VmdkExtent *extent, 1029 VmdkMetaData *m_data, 1030 uint64_t offset, 1031 int allocate, 1032 uint64_t *cluster_offset) 1033 { 1034 unsigned int l1_index, l2_offset, l2_index; 1035 int min_index, i, j; 1036 uint32_t min_count, *l2_table; 1037 bool zeroed = false; 1038 1039 if (m_data) { 1040 m_data->valid = 0; 1041 } 1042 if (extent->flat) { 1043 *cluster_offset = extent->flat_start_offset; 1044 return VMDK_OK; 1045 } 1046 1047 offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE; 1048 l1_index = (offset >> 9) / extent->l1_entry_sectors; 1049 if (l1_index >= extent->l1_size) { 1050 return VMDK_ERROR; 1051 } 1052 l2_offset = extent->l1_table[l1_index]; 1053 if (!l2_offset) { 1054 return VMDK_UNALLOC; 1055 } 1056 for (i = 0; i < L2_CACHE_SIZE; i++) { 1057 if (l2_offset == extent->l2_cache_offsets[i]) { 1058 /* increment the hit count */ 1059 if (++extent->l2_cache_counts[i] == 0xffffffff) { 1060 for (j = 0; j < L2_CACHE_SIZE; j++) { 1061 extent->l2_cache_counts[j] >>= 1; 1062 } 1063 } 1064 l2_table = extent->l2_cache + (i * extent->l2_size); 1065 goto found; 1066 } 1067 } 1068 /* not found: load a new entry in the least used one */ 1069 min_index = 0; 1070 min_count = 0xffffffff; 1071 for (i = 0; i < L2_CACHE_SIZE; i++) { 1072 if (extent->l2_cache_counts[i] < min_count) { 1073 min_count = extent->l2_cache_counts[i]; 1074 min_index = i; 1075 } 1076 } 1077 l2_table = extent->l2_cache + (min_index * extent->l2_size); 1078 if (bdrv_pread( 1079 extent->file, 1080 (int64_t)l2_offset * 512, 1081 l2_table, 1082 extent->l2_size * sizeof(uint32_t) 1083 ) != extent->l2_size * sizeof(uint32_t)) { 1084 return VMDK_ERROR; 1085 } 1086 1087 extent->l2_cache_offsets[min_index] = l2_offset; 1088 extent->l2_cache_counts[min_index] = 1; 1089 found: 1090 l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size; 1091 *cluster_offset = le32_to_cpu(l2_table[l2_index]); 1092 1093 if (m_data) { 1094 m_data->valid = 1; 1095 m_data->l1_index = l1_index; 1096 m_data->l2_index = l2_index; 1097 m_data->offset = *cluster_offset; 1098 m_data->l2_offset = l2_offset; 1099 m_data->l2_cache_entry = &l2_table[l2_index]; 1100 } 1101 if (extent->has_zero_grain && *cluster_offset == VMDK_GTE_ZEROED) { 1102 zeroed = true; 1103 } 1104 1105 if (!*cluster_offset || zeroed) { 1106 if (!allocate) { 1107 return zeroed ? VMDK_ZEROED : VMDK_UNALLOC; 1108 } 1109 1110 /* Avoid the L2 tables update for the images that have snapshots. */ 1111 *cluster_offset = bdrv_getlength(extent->file); 1112 if (!extent->compressed) { 1113 bdrv_truncate( 1114 extent->file, 1115 *cluster_offset + (extent->cluster_sectors << 9) 1116 ); 1117 } 1118 1119 *cluster_offset >>= 9; 1120 l2_table[l2_index] = cpu_to_le32(*cluster_offset); 1121 1122 /* First of all we write grain itself, to avoid race condition 1123 * that may to corrupt the image. 1124 * This problem may occur because of insufficient space on host disk 1125 * or inappropriate VM shutdown. 1126 */ 1127 if (get_whole_cluster( 1128 bs, extent, *cluster_offset, offset, allocate) == -1) { 1129 return VMDK_ERROR; 1130 } 1131 1132 if (m_data) { 1133 m_data->offset = *cluster_offset; 1134 } 1135 } 1136 *cluster_offset <<= 9; 1137 return VMDK_OK; 1138 } 1139 1140 static VmdkExtent *find_extent(BDRVVmdkState *s, 1141 int64_t sector_num, VmdkExtent *start_hint) 1142 { 1143 VmdkExtent *extent = start_hint; 1144 1145 if (!extent) { 1146 extent = &s->extents[0]; 1147 } 1148 while (extent < &s->extents[s->num_extents]) { 1149 if (sector_num < extent->end_sector) { 1150 return extent; 1151 } 1152 extent++; 1153 } 1154 return NULL; 1155 } 1156 1157 static int64_t coroutine_fn vmdk_co_get_block_status(BlockDriverState *bs, 1158 int64_t sector_num, int nb_sectors, int *pnum) 1159 { 1160 BDRVVmdkState *s = bs->opaque; 1161 int64_t index_in_cluster, n, ret; 1162 uint64_t offset; 1163 VmdkExtent *extent; 1164 1165 extent = find_extent(s, sector_num, NULL); 1166 if (!extent) { 1167 return 0; 1168 } 1169 qemu_co_mutex_lock(&s->lock); 1170 ret = get_cluster_offset(bs, extent, NULL, 1171 sector_num * 512, 0, &offset); 1172 qemu_co_mutex_unlock(&s->lock); 1173 1174 switch (ret) { 1175 case VMDK_ERROR: 1176 ret = -EIO; 1177 break; 1178 case VMDK_UNALLOC: 1179 ret = 0; 1180 break; 1181 case VMDK_ZEROED: 1182 ret = BDRV_BLOCK_ZERO; 1183 break; 1184 case VMDK_OK: 1185 ret = BDRV_BLOCK_DATA; 1186 if (extent->file == bs->file && !extent->compressed) { 1187 ret |= BDRV_BLOCK_OFFSET_VALID | offset; 1188 } 1189 1190 break; 1191 } 1192 1193 index_in_cluster = sector_num % extent->cluster_sectors; 1194 n = extent->cluster_sectors - index_in_cluster; 1195 if (n > nb_sectors) { 1196 n = nb_sectors; 1197 } 1198 *pnum = n; 1199 return ret; 1200 } 1201 1202 static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset, 1203 int64_t offset_in_cluster, const uint8_t *buf, 1204 int nb_sectors, int64_t sector_num) 1205 { 1206 int ret; 1207 VmdkGrainMarker *data = NULL; 1208 uLongf buf_len; 1209 const uint8_t *write_buf = buf; 1210 int write_len = nb_sectors * 512; 1211 1212 if (extent->compressed) { 1213 if (!extent->has_marker) { 1214 ret = -EINVAL; 1215 goto out; 1216 } 1217 buf_len = (extent->cluster_sectors << 9) * 2; 1218 data = g_malloc(buf_len + sizeof(VmdkGrainMarker)); 1219 if (compress(data->data, &buf_len, buf, nb_sectors << 9) != Z_OK || 1220 buf_len == 0) { 1221 ret = -EINVAL; 1222 goto out; 1223 } 1224 data->lba = sector_num; 1225 data->size = buf_len; 1226 write_buf = (uint8_t *)data; 1227 write_len = buf_len + sizeof(VmdkGrainMarker); 1228 } 1229 ret = bdrv_pwrite(extent->file, 1230 cluster_offset + offset_in_cluster, 1231 write_buf, 1232 write_len); 1233 if (ret != write_len) { 1234 ret = ret < 0 ? ret : -EIO; 1235 goto out; 1236 } 1237 ret = 0; 1238 out: 1239 g_free(data); 1240 return ret; 1241 } 1242 1243 static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset, 1244 int64_t offset_in_cluster, uint8_t *buf, 1245 int nb_sectors) 1246 { 1247 int ret; 1248 int cluster_bytes, buf_bytes; 1249 uint8_t *cluster_buf, *compressed_data; 1250 uint8_t *uncomp_buf; 1251 uint32_t data_len; 1252 VmdkGrainMarker *marker; 1253 uLongf buf_len; 1254 1255 1256 if (!extent->compressed) { 1257 ret = bdrv_pread(extent->file, 1258 cluster_offset + offset_in_cluster, 1259 buf, nb_sectors * 512); 1260 if (ret == nb_sectors * 512) { 1261 return 0; 1262 } else { 1263 return -EIO; 1264 } 1265 } 1266 cluster_bytes = extent->cluster_sectors * 512; 1267 /* Read two clusters in case GrainMarker + compressed data > one cluster */ 1268 buf_bytes = cluster_bytes * 2; 1269 cluster_buf = g_malloc(buf_bytes); 1270 uncomp_buf = g_malloc(cluster_bytes); 1271 ret = bdrv_pread(extent->file, 1272 cluster_offset, 1273 cluster_buf, buf_bytes); 1274 if (ret < 0) { 1275 goto out; 1276 } 1277 compressed_data = cluster_buf; 1278 buf_len = cluster_bytes; 1279 data_len = cluster_bytes; 1280 if (extent->has_marker) { 1281 marker = (VmdkGrainMarker *)cluster_buf; 1282 compressed_data = marker->data; 1283 data_len = le32_to_cpu(marker->size); 1284 } 1285 if (!data_len || data_len > buf_bytes) { 1286 ret = -EINVAL; 1287 goto out; 1288 } 1289 ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len); 1290 if (ret != Z_OK) { 1291 ret = -EINVAL; 1292 goto out; 1293 1294 } 1295 if (offset_in_cluster < 0 || 1296 offset_in_cluster + nb_sectors * 512 > buf_len) { 1297 ret = -EINVAL; 1298 goto out; 1299 } 1300 memcpy(buf, uncomp_buf + offset_in_cluster, nb_sectors * 512); 1301 ret = 0; 1302 1303 out: 1304 g_free(uncomp_buf); 1305 g_free(cluster_buf); 1306 return ret; 1307 } 1308 1309 static int vmdk_read(BlockDriverState *bs, int64_t sector_num, 1310 uint8_t *buf, int nb_sectors) 1311 { 1312 BDRVVmdkState *s = bs->opaque; 1313 int ret; 1314 uint64_t n, index_in_cluster; 1315 uint64_t extent_begin_sector, extent_relative_sector_num; 1316 VmdkExtent *extent = NULL; 1317 uint64_t cluster_offset; 1318 1319 while (nb_sectors > 0) { 1320 extent = find_extent(s, sector_num, extent); 1321 if (!extent) { 1322 return -EIO; 1323 } 1324 ret = get_cluster_offset( 1325 bs, extent, NULL, 1326 sector_num << 9, 0, &cluster_offset); 1327 extent_begin_sector = extent->end_sector - extent->sectors; 1328 extent_relative_sector_num = sector_num - extent_begin_sector; 1329 index_in_cluster = extent_relative_sector_num % extent->cluster_sectors; 1330 n = extent->cluster_sectors - index_in_cluster; 1331 if (n > nb_sectors) { 1332 n = nb_sectors; 1333 } 1334 if (ret != VMDK_OK) { 1335 /* if not allocated, try to read from parent image, if exist */ 1336 if (bs->backing_hd && ret != VMDK_ZEROED) { 1337 if (!vmdk_is_cid_valid(bs)) { 1338 return -EINVAL; 1339 } 1340 ret = bdrv_read(bs->backing_hd, sector_num, buf, n); 1341 if (ret < 0) { 1342 return ret; 1343 } 1344 } else { 1345 memset(buf, 0, 512 * n); 1346 } 1347 } else { 1348 ret = vmdk_read_extent(extent, 1349 cluster_offset, index_in_cluster * 512, 1350 buf, n); 1351 if (ret) { 1352 return ret; 1353 } 1354 } 1355 nb_sectors -= n; 1356 sector_num += n; 1357 buf += n * 512; 1358 } 1359 return 0; 1360 } 1361 1362 static coroutine_fn int vmdk_co_read(BlockDriverState *bs, int64_t sector_num, 1363 uint8_t *buf, int nb_sectors) 1364 { 1365 int ret; 1366 BDRVVmdkState *s = bs->opaque; 1367 qemu_co_mutex_lock(&s->lock); 1368 ret = vmdk_read(bs, sector_num, buf, nb_sectors); 1369 qemu_co_mutex_unlock(&s->lock); 1370 return ret; 1371 } 1372 1373 /** 1374 * vmdk_write: 1375 * @zeroed: buf is ignored (data is zero), use zeroed_grain GTE feature 1376 * if possible, otherwise return -ENOTSUP. 1377 * @zero_dry_run: used for zeroed == true only, don't update L2 table, just try 1378 * with each cluster. By dry run we can find if the zero write 1379 * is possible without modifying image data. 1380 * 1381 * Returns: error code with 0 for success. 1382 */ 1383 static int vmdk_write(BlockDriverState *bs, int64_t sector_num, 1384 const uint8_t *buf, int nb_sectors, 1385 bool zeroed, bool zero_dry_run) 1386 { 1387 BDRVVmdkState *s = bs->opaque; 1388 VmdkExtent *extent = NULL; 1389 int ret; 1390 int64_t index_in_cluster, n; 1391 uint64_t extent_begin_sector, extent_relative_sector_num; 1392 uint64_t cluster_offset; 1393 VmdkMetaData m_data; 1394 1395 if (sector_num > bs->total_sectors) { 1396 error_report("Wrong offset: sector_num=0x%" PRIx64 1397 " total_sectors=0x%" PRIx64 "\n", 1398 sector_num, bs->total_sectors); 1399 return -EIO; 1400 } 1401 1402 while (nb_sectors > 0) { 1403 extent = find_extent(s, sector_num, extent); 1404 if (!extent) { 1405 return -EIO; 1406 } 1407 ret = get_cluster_offset( 1408 bs, 1409 extent, 1410 &m_data, 1411 sector_num << 9, !extent->compressed, 1412 &cluster_offset); 1413 if (extent->compressed) { 1414 if (ret == VMDK_OK) { 1415 /* Refuse write to allocated cluster for streamOptimized */ 1416 error_report("Could not write to allocated cluster" 1417 " for streamOptimized"); 1418 return -EIO; 1419 } else { 1420 /* allocate */ 1421 ret = get_cluster_offset( 1422 bs, 1423 extent, 1424 &m_data, 1425 sector_num << 9, 1, 1426 &cluster_offset); 1427 } 1428 } 1429 if (ret == VMDK_ERROR) { 1430 return -EINVAL; 1431 } 1432 extent_begin_sector = extent->end_sector - extent->sectors; 1433 extent_relative_sector_num = sector_num - extent_begin_sector; 1434 index_in_cluster = extent_relative_sector_num % extent->cluster_sectors; 1435 n = extent->cluster_sectors - index_in_cluster; 1436 if (n > nb_sectors) { 1437 n = nb_sectors; 1438 } 1439 if (zeroed) { 1440 /* Do zeroed write, buf is ignored */ 1441 if (extent->has_zero_grain && 1442 index_in_cluster == 0 && 1443 n >= extent->cluster_sectors) { 1444 n = extent->cluster_sectors; 1445 if (!zero_dry_run) { 1446 m_data.offset = VMDK_GTE_ZEROED; 1447 /* update L2 tables */ 1448 if (vmdk_L2update(extent, &m_data) != VMDK_OK) { 1449 return -EIO; 1450 } 1451 } 1452 } else { 1453 return -ENOTSUP; 1454 } 1455 } else { 1456 ret = vmdk_write_extent(extent, 1457 cluster_offset, index_in_cluster * 512, 1458 buf, n, sector_num); 1459 if (ret) { 1460 return ret; 1461 } 1462 if (m_data.valid) { 1463 /* update L2 tables */ 1464 if (vmdk_L2update(extent, &m_data) != VMDK_OK) { 1465 return -EIO; 1466 } 1467 } 1468 } 1469 nb_sectors -= n; 1470 sector_num += n; 1471 buf += n * 512; 1472 1473 /* update CID on the first write every time the virtual disk is 1474 * opened */ 1475 if (!s->cid_updated) { 1476 ret = vmdk_write_cid(bs, time(NULL)); 1477 if (ret < 0) { 1478 return ret; 1479 } 1480 s->cid_updated = true; 1481 } 1482 } 1483 return 0; 1484 } 1485 1486 static coroutine_fn int vmdk_co_write(BlockDriverState *bs, int64_t sector_num, 1487 const uint8_t *buf, int nb_sectors) 1488 { 1489 int ret; 1490 BDRVVmdkState *s = bs->opaque; 1491 qemu_co_mutex_lock(&s->lock); 1492 ret = vmdk_write(bs, sector_num, buf, nb_sectors, false, false); 1493 qemu_co_mutex_unlock(&s->lock); 1494 return ret; 1495 } 1496 1497 static int vmdk_write_compressed(BlockDriverState *bs, 1498 int64_t sector_num, 1499 const uint8_t *buf, 1500 int nb_sectors) 1501 { 1502 BDRVVmdkState *s = bs->opaque; 1503 if (s->num_extents == 1 && s->extents[0].compressed) { 1504 return vmdk_write(bs, sector_num, buf, nb_sectors, false, false); 1505 } else { 1506 return -ENOTSUP; 1507 } 1508 } 1509 1510 static int coroutine_fn vmdk_co_write_zeroes(BlockDriverState *bs, 1511 int64_t sector_num, 1512 int nb_sectors, 1513 BdrvRequestFlags flags) 1514 { 1515 int ret; 1516 BDRVVmdkState *s = bs->opaque; 1517 qemu_co_mutex_lock(&s->lock); 1518 /* write zeroes could fail if sectors not aligned to cluster, test it with 1519 * dry_run == true before really updating image */ 1520 ret = vmdk_write(bs, sector_num, NULL, nb_sectors, true, true); 1521 if (!ret) { 1522 ret = vmdk_write(bs, sector_num, NULL, nb_sectors, true, false); 1523 } 1524 qemu_co_mutex_unlock(&s->lock); 1525 return ret; 1526 } 1527 1528 static int vmdk_create_extent(const char *filename, int64_t filesize, 1529 bool flat, bool compress, bool zeroed_grain, 1530 QemuOpts *opts, Error **errp) 1531 { 1532 int ret, i; 1533 BlockDriverState *bs = NULL; 1534 VMDK4Header header; 1535 Error *local_err = NULL; 1536 uint32_t tmp, magic, grains, gd_sectors, gt_size, gt_count; 1537 uint32_t *gd_buf = NULL; 1538 int gd_buf_size; 1539 1540 ret = bdrv_create_file(filename, opts, &local_err); 1541 if (ret < 0) { 1542 error_propagate(errp, local_err); 1543 goto exit; 1544 } 1545 1546 assert(bs == NULL); 1547 ret = bdrv_open(&bs, filename, NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL, 1548 NULL, &local_err); 1549 if (ret < 0) { 1550 error_propagate(errp, local_err); 1551 goto exit; 1552 } 1553 1554 if (flat) { 1555 ret = bdrv_truncate(bs, filesize); 1556 if (ret < 0) { 1557 error_setg_errno(errp, -ret, "Could not truncate file"); 1558 } 1559 goto exit; 1560 } 1561 magic = cpu_to_be32(VMDK4_MAGIC); 1562 memset(&header, 0, sizeof(header)); 1563 header.version = zeroed_grain ? 2 : 1; 1564 header.flags = VMDK4_FLAG_RGD | VMDK4_FLAG_NL_DETECT 1565 | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0) 1566 | (zeroed_grain ? VMDK4_FLAG_ZERO_GRAIN : 0); 1567 header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0; 1568 header.capacity = filesize / BDRV_SECTOR_SIZE; 1569 header.granularity = 128; 1570 header.num_gtes_per_gt = BDRV_SECTOR_SIZE; 1571 1572 grains = DIV_ROUND_UP(filesize / BDRV_SECTOR_SIZE, header.granularity); 1573 gt_size = DIV_ROUND_UP(header.num_gtes_per_gt * sizeof(uint32_t), 1574 BDRV_SECTOR_SIZE); 1575 gt_count = DIV_ROUND_UP(grains, header.num_gtes_per_gt); 1576 gd_sectors = DIV_ROUND_UP(gt_count * sizeof(uint32_t), BDRV_SECTOR_SIZE); 1577 1578 header.desc_offset = 1; 1579 header.desc_size = 20; 1580 header.rgd_offset = header.desc_offset + header.desc_size; 1581 header.gd_offset = header.rgd_offset + gd_sectors + (gt_size * gt_count); 1582 header.grain_offset = 1583 ROUND_UP(header.gd_offset + gd_sectors + (gt_size * gt_count), 1584 header.granularity); 1585 /* swap endianness for all header fields */ 1586 header.version = cpu_to_le32(header.version); 1587 header.flags = cpu_to_le32(header.flags); 1588 header.capacity = cpu_to_le64(header.capacity); 1589 header.granularity = cpu_to_le64(header.granularity); 1590 header.num_gtes_per_gt = cpu_to_le32(header.num_gtes_per_gt); 1591 header.desc_offset = cpu_to_le64(header.desc_offset); 1592 header.desc_size = cpu_to_le64(header.desc_size); 1593 header.rgd_offset = cpu_to_le64(header.rgd_offset); 1594 header.gd_offset = cpu_to_le64(header.gd_offset); 1595 header.grain_offset = cpu_to_le64(header.grain_offset); 1596 header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm); 1597 1598 header.check_bytes[0] = 0xa; 1599 header.check_bytes[1] = 0x20; 1600 header.check_bytes[2] = 0xd; 1601 header.check_bytes[3] = 0xa; 1602 1603 /* write all the data */ 1604 ret = bdrv_pwrite(bs, 0, &magic, sizeof(magic)); 1605 if (ret < 0) { 1606 error_set(errp, QERR_IO_ERROR); 1607 goto exit; 1608 } 1609 ret = bdrv_pwrite(bs, sizeof(magic), &header, sizeof(header)); 1610 if (ret < 0) { 1611 error_set(errp, QERR_IO_ERROR); 1612 goto exit; 1613 } 1614 1615 ret = bdrv_truncate(bs, le64_to_cpu(header.grain_offset) << 9); 1616 if (ret < 0) { 1617 error_setg_errno(errp, -ret, "Could not truncate file"); 1618 goto exit; 1619 } 1620 1621 /* write grain directory */ 1622 gd_buf_size = gd_sectors * BDRV_SECTOR_SIZE; 1623 gd_buf = g_malloc0(gd_buf_size); 1624 for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_sectors; 1625 i < gt_count; i++, tmp += gt_size) { 1626 gd_buf[i] = cpu_to_le32(tmp); 1627 } 1628 ret = bdrv_pwrite(bs, le64_to_cpu(header.rgd_offset) * BDRV_SECTOR_SIZE, 1629 gd_buf, gd_buf_size); 1630 if (ret < 0) { 1631 error_set(errp, QERR_IO_ERROR); 1632 goto exit; 1633 } 1634 1635 /* write backup grain directory */ 1636 for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_sectors; 1637 i < gt_count; i++, tmp += gt_size) { 1638 gd_buf[i] = cpu_to_le32(tmp); 1639 } 1640 ret = bdrv_pwrite(bs, le64_to_cpu(header.gd_offset) * BDRV_SECTOR_SIZE, 1641 gd_buf, gd_buf_size); 1642 if (ret < 0) { 1643 error_set(errp, QERR_IO_ERROR); 1644 goto exit; 1645 } 1646 1647 ret = 0; 1648 exit: 1649 if (bs) { 1650 bdrv_unref(bs); 1651 } 1652 g_free(gd_buf); 1653 return ret; 1654 } 1655 1656 static int filename_decompose(const char *filename, char *path, char *prefix, 1657 char *postfix, size_t buf_len, Error **errp) 1658 { 1659 const char *p, *q; 1660 1661 if (filename == NULL || !strlen(filename)) { 1662 error_setg(errp, "No filename provided"); 1663 return VMDK_ERROR; 1664 } 1665 p = strrchr(filename, '/'); 1666 if (p == NULL) { 1667 p = strrchr(filename, '\\'); 1668 } 1669 if (p == NULL) { 1670 p = strrchr(filename, ':'); 1671 } 1672 if (p != NULL) { 1673 p++; 1674 if (p - filename >= buf_len) { 1675 return VMDK_ERROR; 1676 } 1677 pstrcpy(path, p - filename + 1, filename); 1678 } else { 1679 p = filename; 1680 path[0] = '\0'; 1681 } 1682 q = strrchr(p, '.'); 1683 if (q == NULL) { 1684 pstrcpy(prefix, buf_len, p); 1685 postfix[0] = '\0'; 1686 } else { 1687 if (q - p >= buf_len) { 1688 return VMDK_ERROR; 1689 } 1690 pstrcpy(prefix, q - p + 1, p); 1691 pstrcpy(postfix, buf_len, q); 1692 } 1693 return VMDK_OK; 1694 } 1695 1696 static int vmdk_create(const char *filename, QemuOpts *opts, Error **errp) 1697 { 1698 int idx = 0; 1699 BlockDriverState *new_bs = NULL; 1700 Error *local_err = NULL; 1701 char *desc = NULL; 1702 int64_t total_size = 0, filesize; 1703 char *adapter_type = NULL; 1704 char *backing_file = NULL; 1705 char *fmt = NULL; 1706 int flags = 0; 1707 int ret = 0; 1708 bool flat, split, compress; 1709 GString *ext_desc_lines; 1710 char path[PATH_MAX], prefix[PATH_MAX], postfix[PATH_MAX]; 1711 const int64_t split_size = 0x80000000; /* VMDK has constant split size */ 1712 const char *desc_extent_line; 1713 char parent_desc_line[BUF_SIZE] = ""; 1714 uint32_t parent_cid = 0xffffffff; 1715 uint32_t number_heads = 16; 1716 bool zeroed_grain = false; 1717 uint32_t desc_offset = 0, desc_len; 1718 const char desc_template[] = 1719 "# Disk DescriptorFile\n" 1720 "version=1\n" 1721 "CID=%" PRIx32 "\n" 1722 "parentCID=%" PRIx32 "\n" 1723 "createType=\"%s\"\n" 1724 "%s" 1725 "\n" 1726 "# Extent description\n" 1727 "%s" 1728 "\n" 1729 "# The Disk Data Base\n" 1730 "#DDB\n" 1731 "\n" 1732 "ddb.virtualHWVersion = \"%d\"\n" 1733 "ddb.geometry.cylinders = \"%" PRId64 "\"\n" 1734 "ddb.geometry.heads = \"%" PRIu32 "\"\n" 1735 "ddb.geometry.sectors = \"63\"\n" 1736 "ddb.adapterType = \"%s\"\n"; 1737 1738 ext_desc_lines = g_string_new(NULL); 1739 1740 if (filename_decompose(filename, path, prefix, postfix, PATH_MAX, errp)) { 1741 ret = -EINVAL; 1742 goto exit; 1743 } 1744 /* Read out options */ 1745 total_size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0); 1746 adapter_type = qemu_opt_get_del(opts, BLOCK_OPT_ADAPTER_TYPE); 1747 backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE); 1748 if (qemu_opt_get_bool_del(opts, BLOCK_OPT_COMPAT6, false)) { 1749 flags |= BLOCK_FLAG_COMPAT6; 1750 } 1751 fmt = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT); 1752 if (qemu_opt_get_bool_del(opts, BLOCK_OPT_ZEROED_GRAIN, false)) { 1753 zeroed_grain = true; 1754 } 1755 1756 if (!adapter_type) { 1757 adapter_type = g_strdup("ide"); 1758 } else if (strcmp(adapter_type, "ide") && 1759 strcmp(adapter_type, "buslogic") && 1760 strcmp(adapter_type, "lsilogic") && 1761 strcmp(adapter_type, "legacyESX")) { 1762 error_setg(errp, "Unknown adapter type: '%s'", adapter_type); 1763 ret = -EINVAL; 1764 goto exit; 1765 } 1766 if (strcmp(adapter_type, "ide") != 0) { 1767 /* that's the number of heads with which vmware operates when 1768 creating, exporting, etc. vmdk files with a non-ide adapter type */ 1769 number_heads = 255; 1770 } 1771 if (!fmt) { 1772 /* Default format to monolithicSparse */ 1773 fmt = g_strdup("monolithicSparse"); 1774 } else if (strcmp(fmt, "monolithicFlat") && 1775 strcmp(fmt, "monolithicSparse") && 1776 strcmp(fmt, "twoGbMaxExtentSparse") && 1777 strcmp(fmt, "twoGbMaxExtentFlat") && 1778 strcmp(fmt, "streamOptimized")) { 1779 error_setg(errp, "Unknown subformat: '%s'", fmt); 1780 ret = -EINVAL; 1781 goto exit; 1782 } 1783 split = !(strcmp(fmt, "twoGbMaxExtentFlat") && 1784 strcmp(fmt, "twoGbMaxExtentSparse")); 1785 flat = !(strcmp(fmt, "monolithicFlat") && 1786 strcmp(fmt, "twoGbMaxExtentFlat")); 1787 compress = !strcmp(fmt, "streamOptimized"); 1788 if (flat) { 1789 desc_extent_line = "RW %" PRId64 " FLAT \"%s\" 0\n"; 1790 } else { 1791 desc_extent_line = "RW %" PRId64 " SPARSE \"%s\"\n"; 1792 } 1793 if (flat && backing_file) { 1794 error_setg(errp, "Flat image can't have backing file"); 1795 ret = -ENOTSUP; 1796 goto exit; 1797 } 1798 if (flat && zeroed_grain) { 1799 error_setg(errp, "Flat image can't enable zeroed grain"); 1800 ret = -ENOTSUP; 1801 goto exit; 1802 } 1803 if (backing_file) { 1804 BlockDriverState *bs = NULL; 1805 ret = bdrv_open(&bs, backing_file, NULL, NULL, BDRV_O_NO_BACKING, NULL, 1806 errp); 1807 if (ret != 0) { 1808 goto exit; 1809 } 1810 if (strcmp(bs->drv->format_name, "vmdk")) { 1811 bdrv_unref(bs); 1812 ret = -EINVAL; 1813 goto exit; 1814 } 1815 parent_cid = vmdk_read_cid(bs, 0); 1816 bdrv_unref(bs); 1817 snprintf(parent_desc_line, sizeof(parent_desc_line), 1818 "parentFileNameHint=\"%s\"", backing_file); 1819 } 1820 1821 /* Create extents */ 1822 filesize = total_size; 1823 while (filesize > 0) { 1824 char desc_line[BUF_SIZE]; 1825 char ext_filename[PATH_MAX]; 1826 char desc_filename[PATH_MAX]; 1827 int64_t size = filesize; 1828 1829 if (split && size > split_size) { 1830 size = split_size; 1831 } 1832 if (split) { 1833 snprintf(desc_filename, sizeof(desc_filename), "%s-%c%03d%s", 1834 prefix, flat ? 'f' : 's', ++idx, postfix); 1835 } else if (flat) { 1836 snprintf(desc_filename, sizeof(desc_filename), "%s-flat%s", 1837 prefix, postfix); 1838 } else { 1839 snprintf(desc_filename, sizeof(desc_filename), "%s%s", 1840 prefix, postfix); 1841 } 1842 snprintf(ext_filename, sizeof(ext_filename), "%s%s", 1843 path, desc_filename); 1844 1845 if (vmdk_create_extent(ext_filename, size, 1846 flat, compress, zeroed_grain, opts, errp)) { 1847 ret = -EINVAL; 1848 goto exit; 1849 } 1850 filesize -= size; 1851 1852 /* Format description line */ 1853 snprintf(desc_line, sizeof(desc_line), 1854 desc_extent_line, size / BDRV_SECTOR_SIZE, desc_filename); 1855 g_string_append(ext_desc_lines, desc_line); 1856 } 1857 /* generate descriptor file */ 1858 desc = g_strdup_printf(desc_template, 1859 (uint32_t)time(NULL), 1860 parent_cid, 1861 fmt, 1862 parent_desc_line, 1863 ext_desc_lines->str, 1864 (flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), 1865 total_size / 1866 (int64_t)(63 * number_heads * BDRV_SECTOR_SIZE), 1867 number_heads, 1868 adapter_type); 1869 desc_len = strlen(desc); 1870 /* the descriptor offset = 0x200 */ 1871 if (!split && !flat) { 1872 desc_offset = 0x200; 1873 } else { 1874 ret = bdrv_create_file(filename, opts, &local_err); 1875 if (ret < 0) { 1876 error_propagate(errp, local_err); 1877 goto exit; 1878 } 1879 } 1880 assert(new_bs == NULL); 1881 ret = bdrv_open(&new_bs, filename, NULL, NULL, 1882 BDRV_O_RDWR | BDRV_O_PROTOCOL, NULL, &local_err); 1883 if (ret < 0) { 1884 error_propagate(errp, local_err); 1885 goto exit; 1886 } 1887 ret = bdrv_pwrite(new_bs, desc_offset, desc, desc_len); 1888 if (ret < 0) { 1889 error_setg_errno(errp, -ret, "Could not write description"); 1890 goto exit; 1891 } 1892 /* bdrv_pwrite write padding zeros to align to sector, we don't need that 1893 * for description file */ 1894 if (desc_offset == 0) { 1895 ret = bdrv_truncate(new_bs, desc_len); 1896 if (ret < 0) { 1897 error_setg_errno(errp, -ret, "Could not truncate file"); 1898 } 1899 } 1900 exit: 1901 if (new_bs) { 1902 bdrv_unref(new_bs); 1903 } 1904 g_free(adapter_type); 1905 g_free(backing_file); 1906 g_free(fmt); 1907 g_free(desc); 1908 g_string_free(ext_desc_lines, true); 1909 return ret; 1910 } 1911 1912 static void vmdk_close(BlockDriverState *bs) 1913 { 1914 BDRVVmdkState *s = bs->opaque; 1915 1916 vmdk_free_extents(bs); 1917 g_free(s->create_type); 1918 1919 migrate_del_blocker(s->migration_blocker); 1920 error_free(s->migration_blocker); 1921 } 1922 1923 static coroutine_fn int vmdk_co_flush(BlockDriverState *bs) 1924 { 1925 BDRVVmdkState *s = bs->opaque; 1926 int i, err; 1927 int ret = 0; 1928 1929 for (i = 0; i < s->num_extents; i++) { 1930 err = bdrv_co_flush(s->extents[i].file); 1931 if (err < 0) { 1932 ret = err; 1933 } 1934 } 1935 return ret; 1936 } 1937 1938 static int64_t vmdk_get_allocated_file_size(BlockDriverState *bs) 1939 { 1940 int i; 1941 int64_t ret = 0; 1942 int64_t r; 1943 BDRVVmdkState *s = bs->opaque; 1944 1945 ret = bdrv_get_allocated_file_size(bs->file); 1946 if (ret < 0) { 1947 return ret; 1948 } 1949 for (i = 0; i < s->num_extents; i++) { 1950 if (s->extents[i].file == bs->file) { 1951 continue; 1952 } 1953 r = bdrv_get_allocated_file_size(s->extents[i].file); 1954 if (r < 0) { 1955 return r; 1956 } 1957 ret += r; 1958 } 1959 return ret; 1960 } 1961 1962 static int vmdk_has_zero_init(BlockDriverState *bs) 1963 { 1964 int i; 1965 BDRVVmdkState *s = bs->opaque; 1966 1967 /* If has a flat extent and its underlying storage doesn't have zero init, 1968 * return 0. */ 1969 for (i = 0; i < s->num_extents; i++) { 1970 if (s->extents[i].flat) { 1971 if (!bdrv_has_zero_init(s->extents[i].file)) { 1972 return 0; 1973 } 1974 } 1975 } 1976 return 1; 1977 } 1978 1979 static ImageInfo *vmdk_get_extent_info(VmdkExtent *extent) 1980 { 1981 ImageInfo *info = g_new0(ImageInfo, 1); 1982 1983 *info = (ImageInfo){ 1984 .filename = g_strdup(extent->file->filename), 1985 .format = g_strdup(extent->type), 1986 .virtual_size = extent->sectors * BDRV_SECTOR_SIZE, 1987 .compressed = extent->compressed, 1988 .has_compressed = extent->compressed, 1989 .cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE, 1990 .has_cluster_size = !extent->flat, 1991 }; 1992 1993 return info; 1994 } 1995 1996 static int vmdk_check(BlockDriverState *bs, BdrvCheckResult *result, 1997 BdrvCheckMode fix) 1998 { 1999 BDRVVmdkState *s = bs->opaque; 2000 VmdkExtent *extent = NULL; 2001 int64_t sector_num = 0; 2002 int64_t total_sectors = bdrv_getlength(bs) / BDRV_SECTOR_SIZE; 2003 int ret; 2004 uint64_t cluster_offset; 2005 2006 if (fix) { 2007 return -ENOTSUP; 2008 } 2009 2010 for (;;) { 2011 if (sector_num >= total_sectors) { 2012 return 0; 2013 } 2014 extent = find_extent(s, sector_num, extent); 2015 if (!extent) { 2016 fprintf(stderr, 2017 "ERROR: could not find extent for sector %" PRId64 "\n", 2018 sector_num); 2019 break; 2020 } 2021 ret = get_cluster_offset(bs, extent, NULL, 2022 sector_num << BDRV_SECTOR_BITS, 2023 0, &cluster_offset); 2024 if (ret == VMDK_ERROR) { 2025 fprintf(stderr, 2026 "ERROR: could not get cluster_offset for sector %" 2027 PRId64 "\n", sector_num); 2028 break; 2029 } 2030 if (ret == VMDK_OK && cluster_offset >= bdrv_getlength(extent->file)) { 2031 fprintf(stderr, 2032 "ERROR: cluster offset for sector %" 2033 PRId64 " points after EOF\n", sector_num); 2034 break; 2035 } 2036 sector_num += extent->cluster_sectors; 2037 } 2038 2039 result->corruptions++; 2040 return 0; 2041 } 2042 2043 static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs) 2044 { 2045 int i; 2046 BDRVVmdkState *s = bs->opaque; 2047 ImageInfoSpecific *spec_info = g_new0(ImageInfoSpecific, 1); 2048 ImageInfoList **next; 2049 2050 *spec_info = (ImageInfoSpecific){ 2051 .kind = IMAGE_INFO_SPECIFIC_KIND_VMDK, 2052 { 2053 .vmdk = g_new0(ImageInfoSpecificVmdk, 1), 2054 }, 2055 }; 2056 2057 *spec_info->vmdk = (ImageInfoSpecificVmdk) { 2058 .create_type = g_strdup(s->create_type), 2059 .cid = s->cid, 2060 .parent_cid = s->parent_cid, 2061 }; 2062 2063 next = &spec_info->vmdk->extents; 2064 for (i = 0; i < s->num_extents; i++) { 2065 *next = g_new0(ImageInfoList, 1); 2066 (*next)->value = vmdk_get_extent_info(&s->extents[i]); 2067 (*next)->next = NULL; 2068 next = &(*next)->next; 2069 } 2070 2071 return spec_info; 2072 } 2073 2074 static int vmdk_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 2075 { 2076 int i; 2077 BDRVVmdkState *s = bs->opaque; 2078 assert(s->num_extents); 2079 bdi->needs_compressed_writes = s->extents[0].compressed; 2080 if (!s->extents[0].flat) { 2081 bdi->cluster_size = s->extents[0].cluster_sectors << BDRV_SECTOR_BITS; 2082 } 2083 /* See if we have multiple extents but they have different cases */ 2084 for (i = 1; i < s->num_extents; i++) { 2085 if (bdi->needs_compressed_writes != s->extents[i].compressed || 2086 (bdi->cluster_size && bdi->cluster_size != 2087 s->extents[i].cluster_sectors << BDRV_SECTOR_BITS)) { 2088 return -ENOTSUP; 2089 } 2090 } 2091 return 0; 2092 } 2093 2094 static void vmdk_detach_aio_context(BlockDriverState *bs) 2095 { 2096 BDRVVmdkState *s = bs->opaque; 2097 int i; 2098 2099 for (i = 0; i < s->num_extents; i++) { 2100 bdrv_detach_aio_context(s->extents[i].file); 2101 } 2102 } 2103 2104 static void vmdk_attach_aio_context(BlockDriverState *bs, 2105 AioContext *new_context) 2106 { 2107 BDRVVmdkState *s = bs->opaque; 2108 int i; 2109 2110 for (i = 0; i < s->num_extents; i++) { 2111 bdrv_attach_aio_context(s->extents[i].file, new_context); 2112 } 2113 } 2114 2115 static QemuOptsList vmdk_create_opts = { 2116 .name = "vmdk-create-opts", 2117 .head = QTAILQ_HEAD_INITIALIZER(vmdk_create_opts.head), 2118 .desc = { 2119 { 2120 .name = BLOCK_OPT_SIZE, 2121 .type = QEMU_OPT_SIZE, 2122 .help = "Virtual disk size" 2123 }, 2124 { 2125 .name = BLOCK_OPT_ADAPTER_TYPE, 2126 .type = QEMU_OPT_STRING, 2127 .help = "Virtual adapter type, can be one of " 2128 "ide (default), lsilogic, buslogic or legacyESX" 2129 }, 2130 { 2131 .name = BLOCK_OPT_BACKING_FILE, 2132 .type = QEMU_OPT_STRING, 2133 .help = "File name of a base image" 2134 }, 2135 { 2136 .name = BLOCK_OPT_COMPAT6, 2137 .type = QEMU_OPT_BOOL, 2138 .help = "VMDK version 6 image", 2139 .def_value_str = "off" 2140 }, 2141 { 2142 .name = BLOCK_OPT_SUBFMT, 2143 .type = QEMU_OPT_STRING, 2144 .help = 2145 "VMDK flat extent format, can be one of " 2146 "{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} " 2147 }, 2148 { 2149 .name = BLOCK_OPT_ZEROED_GRAIN, 2150 .type = QEMU_OPT_BOOL, 2151 .help = "Enable efficient zero writes " 2152 "using the zeroed-grain GTE feature" 2153 }, 2154 { /* end of list */ } 2155 } 2156 }; 2157 2158 static BlockDriver bdrv_vmdk = { 2159 .format_name = "vmdk", 2160 .instance_size = sizeof(BDRVVmdkState), 2161 .bdrv_probe = vmdk_probe, 2162 .bdrv_open = vmdk_open, 2163 .bdrv_check = vmdk_check, 2164 .bdrv_reopen_prepare = vmdk_reopen_prepare, 2165 .bdrv_read = vmdk_co_read, 2166 .bdrv_write = vmdk_co_write, 2167 .bdrv_write_compressed = vmdk_write_compressed, 2168 .bdrv_co_write_zeroes = vmdk_co_write_zeroes, 2169 .bdrv_close = vmdk_close, 2170 .bdrv_create = vmdk_create, 2171 .bdrv_co_flush_to_disk = vmdk_co_flush, 2172 .bdrv_co_get_block_status = vmdk_co_get_block_status, 2173 .bdrv_get_allocated_file_size = vmdk_get_allocated_file_size, 2174 .bdrv_has_zero_init = vmdk_has_zero_init, 2175 .bdrv_get_specific_info = vmdk_get_specific_info, 2176 .bdrv_refresh_limits = vmdk_refresh_limits, 2177 .bdrv_get_info = vmdk_get_info, 2178 .bdrv_detach_aio_context = vmdk_detach_aio_context, 2179 .bdrv_attach_aio_context = vmdk_attach_aio_context, 2180 2181 .supports_backing = true, 2182 .create_opts = &vmdk_create_opts, 2183 }; 2184 2185 static void bdrv_vmdk_init(void) 2186 { 2187 bdrv_register(&bdrv_vmdk); 2188 } 2189 2190 block_init(bdrv_vmdk_init); 2191