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 int64_t next_cluster_sector; 110 char *type; 111 } VmdkExtent; 112 113 typedef struct BDRVVmdkState { 114 CoMutex lock; 115 uint64_t desc_offset; 116 bool cid_updated; 117 bool cid_checked; 118 uint32_t cid; 119 uint32_t parent_cid; 120 int num_extents; 121 /* Extent array with num_extents entries, ascend ordered by address */ 122 VmdkExtent *extents; 123 Error *migration_blocker; 124 char *create_type; 125 } BDRVVmdkState; 126 127 typedef struct VmdkMetaData { 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_renew(VmdkExtent, s->extents, s->num_extents); 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 int64_t nb_sectors; 401 402 if (cluster_sectors > 0x200000) { 403 /* 0x200000 * 512Bytes = 1GB for one cluster is unrealistic */ 404 error_setg(errp, "Invalid granularity, image may be corrupt"); 405 return -EFBIG; 406 } 407 if (l1_size > 512 * 1024 * 1024) { 408 /* Although with big capacity and small l1_entry_sectors, we can get a 409 * big l1_size, we don't want unbounded value to allocate the table. 410 * Limit it to 512M, which is 16PB for default cluster and L2 table 411 * size */ 412 error_setg(errp, "L1 size too big"); 413 return -EFBIG; 414 } 415 416 nb_sectors = bdrv_nb_sectors(file); 417 if (nb_sectors < 0) { 418 return nb_sectors; 419 } 420 421 s->extents = g_renew(VmdkExtent, s->extents, s->num_extents + 1); 422 extent = &s->extents[s->num_extents]; 423 s->num_extents++; 424 425 memset(extent, 0, sizeof(VmdkExtent)); 426 extent->file = file; 427 extent->flat = flat; 428 extent->sectors = sectors; 429 extent->l1_table_offset = l1_offset; 430 extent->l1_backup_table_offset = l1_backup_offset; 431 extent->l1_size = l1_size; 432 extent->l1_entry_sectors = l2_size * cluster_sectors; 433 extent->l2_size = l2_size; 434 extent->cluster_sectors = flat ? sectors : cluster_sectors; 435 extent->next_cluster_sector = ROUND_UP(nb_sectors, cluster_sectors); 436 437 if (s->num_extents > 1) { 438 extent->end_sector = (*(extent - 1)).end_sector + extent->sectors; 439 } else { 440 extent->end_sector = extent->sectors; 441 } 442 bs->total_sectors = extent->end_sector; 443 if (new_extent) { 444 *new_extent = extent; 445 } 446 return 0; 447 } 448 449 static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent, 450 Error **errp) 451 { 452 int ret; 453 int l1_size, i; 454 455 /* read the L1 table */ 456 l1_size = extent->l1_size * sizeof(uint32_t); 457 extent->l1_table = g_try_malloc(l1_size); 458 if (l1_size && extent->l1_table == NULL) { 459 return -ENOMEM; 460 } 461 462 ret = bdrv_pread(extent->file, 463 extent->l1_table_offset, 464 extent->l1_table, 465 l1_size); 466 if (ret < 0) { 467 error_setg_errno(errp, -ret, 468 "Could not read l1 table from extent '%s'", 469 extent->file->filename); 470 goto fail_l1; 471 } 472 for (i = 0; i < extent->l1_size; i++) { 473 le32_to_cpus(&extent->l1_table[i]); 474 } 475 476 if (extent->l1_backup_table_offset) { 477 extent->l1_backup_table = g_try_malloc(l1_size); 478 if (l1_size && extent->l1_backup_table == NULL) { 479 ret = -ENOMEM; 480 goto fail_l1; 481 } 482 ret = bdrv_pread(extent->file, 483 extent->l1_backup_table_offset, 484 extent->l1_backup_table, 485 l1_size); 486 if (ret < 0) { 487 error_setg_errno(errp, -ret, 488 "Could not read l1 backup table from extent '%s'", 489 extent->file->filename); 490 goto fail_l1b; 491 } 492 for (i = 0; i < extent->l1_size; i++) { 493 le32_to_cpus(&extent->l1_backup_table[i]); 494 } 495 } 496 497 extent->l2_cache = 498 g_new(uint32_t, extent->l2_size * L2_CACHE_SIZE); 499 return 0; 500 fail_l1b: 501 g_free(extent->l1_backup_table); 502 fail_l1: 503 g_free(extent->l1_table); 504 return ret; 505 } 506 507 static int vmdk_open_vmfs_sparse(BlockDriverState *bs, 508 BlockDriverState *file, 509 int flags, Error **errp) 510 { 511 int ret; 512 uint32_t magic; 513 VMDK3Header header; 514 VmdkExtent *extent; 515 516 ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); 517 if (ret < 0) { 518 error_setg_errno(errp, -ret, 519 "Could not read header from file '%s'", 520 file->filename); 521 return ret; 522 } 523 ret = vmdk_add_extent(bs, file, false, 524 le32_to_cpu(header.disk_sectors), 525 le32_to_cpu(header.l1dir_offset) << 9, 526 0, 527 le32_to_cpu(header.l1dir_size), 528 4096, 529 le32_to_cpu(header.granularity), 530 &extent, 531 errp); 532 if (ret < 0) { 533 return ret; 534 } 535 ret = vmdk_init_tables(bs, extent, errp); 536 if (ret) { 537 /* free extent allocated by vmdk_add_extent */ 538 vmdk_free_last_extent(bs); 539 } 540 return ret; 541 } 542 543 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf, 544 Error **errp); 545 546 static char *vmdk_read_desc(BlockDriverState *file, uint64_t desc_offset, 547 Error **errp) 548 { 549 int64_t size; 550 char *buf; 551 int ret; 552 553 size = bdrv_getlength(file); 554 if (size < 0) { 555 error_setg_errno(errp, -size, "Could not access file"); 556 return NULL; 557 } 558 559 size = MIN(size, 1 << 20); /* avoid unbounded allocation */ 560 buf = g_malloc0(size + 1); 561 562 ret = bdrv_pread(file, desc_offset, buf, size); 563 if (ret < 0) { 564 error_setg_errno(errp, -ret, "Could not read from file"); 565 g_free(buf); 566 return NULL; 567 } 568 569 return buf; 570 } 571 572 static int vmdk_open_vmdk4(BlockDriverState *bs, 573 BlockDriverState *file, 574 int flags, Error **errp) 575 { 576 int ret; 577 uint32_t magic; 578 uint32_t l1_size, l1_entry_sectors; 579 VMDK4Header header; 580 VmdkExtent *extent; 581 BDRVVmdkState *s = bs->opaque; 582 int64_t l1_backup_offset = 0; 583 584 ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); 585 if (ret < 0) { 586 error_setg_errno(errp, -ret, 587 "Could not read header from file '%s'", 588 file->filename); 589 return -EINVAL; 590 } 591 if (header.capacity == 0) { 592 uint64_t desc_offset = le64_to_cpu(header.desc_offset); 593 if (desc_offset) { 594 char *buf = vmdk_read_desc(file, desc_offset << 9, errp); 595 if (!buf) { 596 return -EINVAL; 597 } 598 ret = vmdk_open_desc_file(bs, flags, buf, errp); 599 g_free(buf); 600 return ret; 601 } 602 } 603 604 if (!s->create_type) { 605 s->create_type = g_strdup("monolithicSparse"); 606 } 607 608 if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) { 609 /* 610 * The footer takes precedence over the header, so read it in. The 611 * footer starts at offset -1024 from the end: One sector for the 612 * footer, and another one for the end-of-stream marker. 613 */ 614 struct { 615 struct { 616 uint64_t val; 617 uint32_t size; 618 uint32_t type; 619 uint8_t pad[512 - 16]; 620 } QEMU_PACKED footer_marker; 621 622 uint32_t magic; 623 VMDK4Header header; 624 uint8_t pad[512 - 4 - sizeof(VMDK4Header)]; 625 626 struct { 627 uint64_t val; 628 uint32_t size; 629 uint32_t type; 630 uint8_t pad[512 - 16]; 631 } QEMU_PACKED eos_marker; 632 } QEMU_PACKED footer; 633 634 ret = bdrv_pread(file, 635 bs->file->total_sectors * 512 - 1536, 636 &footer, sizeof(footer)); 637 if (ret < 0) { 638 return ret; 639 } 640 641 /* Some sanity checks for the footer */ 642 if (be32_to_cpu(footer.magic) != VMDK4_MAGIC || 643 le32_to_cpu(footer.footer_marker.size) != 0 || 644 le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER || 645 le64_to_cpu(footer.eos_marker.val) != 0 || 646 le32_to_cpu(footer.eos_marker.size) != 0 || 647 le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM) 648 { 649 return -EINVAL; 650 } 651 652 header = footer.header; 653 } 654 655 if (le32_to_cpu(header.version) > 3) { 656 char buf[64]; 657 snprintf(buf, sizeof(buf), "VMDK version %" PRId32, 658 le32_to_cpu(header.version)); 659 error_set(errp, QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, 660 bs->device_name, "vmdk", buf); 661 return -ENOTSUP; 662 } else if (le32_to_cpu(header.version) == 3 && (flags & BDRV_O_RDWR)) { 663 /* VMware KB 2064959 explains that version 3 added support for 664 * persistent changed block tracking (CBT), and backup software can 665 * read it as version=1 if it doesn't care about the changed area 666 * information. So we are safe to enable read only. */ 667 error_setg(errp, "VMDK version 3 must be read only"); 668 return -EINVAL; 669 } 670 671 if (le32_to_cpu(header.num_gtes_per_gt) > 512) { 672 error_setg(errp, "L2 table size too big"); 673 return -EINVAL; 674 } 675 676 l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gt) 677 * le64_to_cpu(header.granularity); 678 if (l1_entry_sectors == 0) { 679 return -EINVAL; 680 } 681 l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1) 682 / l1_entry_sectors; 683 if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) { 684 l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9; 685 } 686 if (bdrv_nb_sectors(file) < le64_to_cpu(header.grain_offset)) { 687 error_setg(errp, "File truncated, expecting at least %" PRId64 " bytes", 688 (int64_t)(le64_to_cpu(header.grain_offset) 689 * BDRV_SECTOR_SIZE)); 690 return -EINVAL; 691 } 692 693 ret = vmdk_add_extent(bs, file, false, 694 le64_to_cpu(header.capacity), 695 le64_to_cpu(header.gd_offset) << 9, 696 l1_backup_offset, 697 l1_size, 698 le32_to_cpu(header.num_gtes_per_gt), 699 le64_to_cpu(header.granularity), 700 &extent, 701 errp); 702 if (ret < 0) { 703 return ret; 704 } 705 extent->compressed = 706 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; 707 if (extent->compressed) { 708 g_free(s->create_type); 709 s->create_type = g_strdup("streamOptimized"); 710 } 711 extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER; 712 extent->version = le32_to_cpu(header.version); 713 extent->has_zero_grain = le32_to_cpu(header.flags) & VMDK4_FLAG_ZERO_GRAIN; 714 ret = vmdk_init_tables(bs, extent, errp); 715 if (ret) { 716 /* free extent allocated by vmdk_add_extent */ 717 vmdk_free_last_extent(bs); 718 } 719 return ret; 720 } 721 722 /* find an option value out of descriptor file */ 723 static int vmdk_parse_description(const char *desc, const char *opt_name, 724 char *buf, int buf_size) 725 { 726 char *opt_pos, *opt_end; 727 const char *end = desc + strlen(desc); 728 729 opt_pos = strstr(desc, opt_name); 730 if (!opt_pos) { 731 return VMDK_ERROR; 732 } 733 /* Skip "=\"" following opt_name */ 734 opt_pos += strlen(opt_name) + 2; 735 if (opt_pos >= end) { 736 return VMDK_ERROR; 737 } 738 opt_end = opt_pos; 739 while (opt_end < end && *opt_end != '"') { 740 opt_end++; 741 } 742 if (opt_end == end || buf_size < opt_end - opt_pos + 1) { 743 return VMDK_ERROR; 744 } 745 pstrcpy(buf, opt_end - opt_pos + 1, opt_pos); 746 return VMDK_OK; 747 } 748 749 /* Open an extent file and append to bs array */ 750 static int vmdk_open_sparse(BlockDriverState *bs, 751 BlockDriverState *file, int flags, 752 char *buf, Error **errp) 753 { 754 uint32_t magic; 755 756 magic = ldl_be_p(buf); 757 switch (magic) { 758 case VMDK3_MAGIC: 759 return vmdk_open_vmfs_sparse(bs, file, flags, errp); 760 break; 761 case VMDK4_MAGIC: 762 return vmdk_open_vmdk4(bs, file, flags, errp); 763 break; 764 default: 765 error_setg(errp, "Image not in VMDK format"); 766 return -EINVAL; 767 break; 768 } 769 } 770 771 static int vmdk_parse_extents(const char *desc, BlockDriverState *bs, 772 const char *desc_file_path, Error **errp) 773 { 774 int ret; 775 char access[11]; 776 char type[11]; 777 char fname[512]; 778 const char *p = desc; 779 int64_t sectors = 0; 780 int64_t flat_offset; 781 char extent_path[PATH_MAX]; 782 BlockDriverState *extent_file; 783 BDRVVmdkState *s = bs->opaque; 784 VmdkExtent *extent; 785 786 while (*p) { 787 /* parse extent line: 788 * RW [size in sectors] FLAT "file-name.vmdk" OFFSET 789 * or 790 * RW [size in sectors] SPARSE "file-name.vmdk" 791 */ 792 flat_offset = -1; 793 ret = sscanf(p, "%10s %" SCNd64 " %10s \"%511[^\n\r\"]\" %" SCNd64, 794 access, §ors, type, fname, &flat_offset); 795 if (ret < 4 || strcmp(access, "RW")) { 796 goto next_line; 797 } else if (!strcmp(type, "FLAT")) { 798 if (ret != 5 || flat_offset < 0) { 799 error_setg(errp, "Invalid extent lines: \n%s", p); 800 return -EINVAL; 801 } 802 } else if (!strcmp(type, "VMFS")) { 803 if (ret == 4) { 804 flat_offset = 0; 805 } else { 806 error_setg(errp, "Invalid extent lines:\n%s", p); 807 return -EINVAL; 808 } 809 } else if (ret != 4) { 810 error_setg(errp, "Invalid extent lines:\n%s", p); 811 return -EINVAL; 812 } 813 814 if (sectors <= 0 || 815 (strcmp(type, "FLAT") && strcmp(type, "SPARSE") && 816 strcmp(type, "VMFS") && strcmp(type, "VMFSSPARSE")) || 817 (strcmp(access, "RW"))) { 818 goto next_line; 819 } 820 821 path_combine(extent_path, sizeof(extent_path), 822 desc_file_path, fname); 823 extent_file = NULL; 824 ret = bdrv_open(&extent_file, extent_path, NULL, NULL, 825 bs->open_flags | BDRV_O_PROTOCOL, NULL, errp); 826 if (ret) { 827 return ret; 828 } 829 830 /* save to extents array */ 831 if (!strcmp(type, "FLAT") || !strcmp(type, "VMFS")) { 832 /* FLAT extent */ 833 834 ret = vmdk_add_extent(bs, extent_file, true, sectors, 835 0, 0, 0, 0, 0, &extent, errp); 836 if (ret < 0) { 837 return ret; 838 } 839 extent->flat_start_offset = flat_offset << 9; 840 } else if (!strcmp(type, "SPARSE") || !strcmp(type, "VMFSSPARSE")) { 841 /* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/ 842 char *buf = vmdk_read_desc(extent_file, 0, errp); 843 if (!buf) { 844 ret = -EINVAL; 845 } else { 846 ret = vmdk_open_sparse(bs, extent_file, bs->open_flags, buf, errp); 847 } 848 if (ret) { 849 g_free(buf); 850 bdrv_unref(extent_file); 851 return ret; 852 } 853 extent = &s->extents[s->num_extents - 1]; 854 } else { 855 error_setg(errp, "Unsupported extent type '%s'", type); 856 return -ENOTSUP; 857 } 858 extent->type = g_strdup(type); 859 next_line: 860 /* move to next line */ 861 while (*p) { 862 if (*p == '\n') { 863 p++; 864 break; 865 } 866 p++; 867 } 868 } 869 return 0; 870 } 871 872 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf, 873 Error **errp) 874 { 875 int ret; 876 char ct[128]; 877 BDRVVmdkState *s = bs->opaque; 878 879 if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) { 880 error_setg(errp, "invalid VMDK image descriptor"); 881 ret = -EINVAL; 882 goto exit; 883 } 884 if (strcmp(ct, "monolithicFlat") && 885 strcmp(ct, "vmfs") && 886 strcmp(ct, "vmfsSparse") && 887 strcmp(ct, "twoGbMaxExtentSparse") && 888 strcmp(ct, "twoGbMaxExtentFlat")) { 889 error_setg(errp, "Unsupported image type '%s'", ct); 890 ret = -ENOTSUP; 891 goto exit; 892 } 893 s->create_type = g_strdup(ct); 894 s->desc_offset = 0; 895 ret = vmdk_parse_extents(buf, bs, bs->file->filename, errp); 896 exit: 897 return ret; 898 } 899 900 static int vmdk_open(BlockDriverState *bs, QDict *options, int flags, 901 Error **errp) 902 { 903 char *buf = NULL; 904 int ret; 905 BDRVVmdkState *s = bs->opaque; 906 uint32_t magic; 907 908 buf = vmdk_read_desc(bs->file, 0, errp); 909 if (!buf) { 910 return -EINVAL; 911 } 912 913 magic = ldl_be_p(buf); 914 switch (magic) { 915 case VMDK3_MAGIC: 916 case VMDK4_MAGIC: 917 ret = vmdk_open_sparse(bs, bs->file, flags, buf, errp); 918 s->desc_offset = 0x200; 919 break; 920 default: 921 ret = vmdk_open_desc_file(bs, flags, buf, errp); 922 break; 923 } 924 if (ret) { 925 goto fail; 926 } 927 928 /* try to open parent images, if exist */ 929 ret = vmdk_parent_open(bs); 930 if (ret) { 931 goto fail; 932 } 933 s->cid = vmdk_read_cid(bs, 0); 934 s->parent_cid = vmdk_read_cid(bs, 1); 935 qemu_co_mutex_init(&s->lock); 936 937 /* Disable migration when VMDK images are used */ 938 error_set(&s->migration_blocker, 939 QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 940 "vmdk", bs->device_name, "live migration"); 941 migrate_add_blocker(s->migration_blocker); 942 g_free(buf); 943 return 0; 944 945 fail: 946 g_free(buf); 947 g_free(s->create_type); 948 s->create_type = NULL; 949 vmdk_free_extents(bs); 950 return ret; 951 } 952 953 954 static void vmdk_refresh_limits(BlockDriverState *bs, Error **errp) 955 { 956 BDRVVmdkState *s = bs->opaque; 957 int i; 958 959 for (i = 0; i < s->num_extents; i++) { 960 if (!s->extents[i].flat) { 961 bs->bl.write_zeroes_alignment = 962 MAX(bs->bl.write_zeroes_alignment, 963 s->extents[i].cluster_sectors); 964 } 965 } 966 } 967 968 /** 969 * get_whole_cluster 970 * 971 * Copy backing file's cluster that covers @sector_num, otherwise write zero, 972 * to the cluster at @cluster_sector_num. 973 * 974 * If @skip_start_sector < @skip_end_sector, the relative range 975 * [@skip_start_sector, @skip_end_sector) is not copied or written, and leave 976 * it for call to write user data in the request. 977 */ 978 static int get_whole_cluster(BlockDriverState *bs, 979 VmdkExtent *extent, 980 uint64_t cluster_sector_num, 981 uint64_t sector_num, 982 uint64_t skip_start_sector, 983 uint64_t skip_end_sector) 984 { 985 int ret = VMDK_OK; 986 int64_t cluster_bytes; 987 uint8_t *whole_grain; 988 989 /* For COW, align request sector_num to cluster start */ 990 sector_num = QEMU_ALIGN_DOWN(sector_num, extent->cluster_sectors); 991 cluster_bytes = extent->cluster_sectors << BDRV_SECTOR_BITS; 992 whole_grain = qemu_blockalign(bs, cluster_bytes); 993 994 if (!bs->backing_hd) { 995 memset(whole_grain, 0, skip_start_sector << BDRV_SECTOR_BITS); 996 memset(whole_grain + (skip_end_sector << BDRV_SECTOR_BITS), 0, 997 cluster_bytes - (skip_end_sector << BDRV_SECTOR_BITS)); 998 } 999 1000 assert(skip_end_sector <= extent->cluster_sectors); 1001 /* we will be here if it's first write on non-exist grain(cluster). 1002 * try to read from parent image, if exist */ 1003 if (bs->backing_hd && !vmdk_is_cid_valid(bs)) { 1004 ret = VMDK_ERROR; 1005 goto exit; 1006 } 1007 1008 /* Read backing data before skip range */ 1009 if (skip_start_sector > 0) { 1010 if (bs->backing_hd) { 1011 ret = bdrv_read(bs->backing_hd, sector_num, 1012 whole_grain, skip_start_sector); 1013 if (ret < 0) { 1014 ret = VMDK_ERROR; 1015 goto exit; 1016 } 1017 } 1018 ret = bdrv_write(extent->file, cluster_sector_num, whole_grain, 1019 skip_start_sector); 1020 if (ret < 0) { 1021 ret = VMDK_ERROR; 1022 goto exit; 1023 } 1024 } 1025 /* Read backing data after skip range */ 1026 if (skip_end_sector < extent->cluster_sectors) { 1027 if (bs->backing_hd) { 1028 ret = bdrv_read(bs->backing_hd, sector_num + skip_end_sector, 1029 whole_grain + (skip_end_sector << BDRV_SECTOR_BITS), 1030 extent->cluster_sectors - skip_end_sector); 1031 if (ret < 0) { 1032 ret = VMDK_ERROR; 1033 goto exit; 1034 } 1035 } 1036 ret = bdrv_write(extent->file, cluster_sector_num + skip_end_sector, 1037 whole_grain + (skip_end_sector << BDRV_SECTOR_BITS), 1038 extent->cluster_sectors - skip_end_sector); 1039 if (ret < 0) { 1040 ret = VMDK_ERROR; 1041 goto exit; 1042 } 1043 } 1044 1045 exit: 1046 qemu_vfree(whole_grain); 1047 return ret; 1048 } 1049 1050 static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data, 1051 uint32_t offset) 1052 { 1053 offset = cpu_to_le32(offset); 1054 /* update L2 table */ 1055 if (bdrv_pwrite_sync( 1056 extent->file, 1057 ((int64_t)m_data->l2_offset * 512) 1058 + (m_data->l2_index * sizeof(offset)), 1059 &offset, sizeof(offset)) < 0) { 1060 return VMDK_ERROR; 1061 } 1062 /* update backup L2 table */ 1063 if (extent->l1_backup_table_offset != 0) { 1064 m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; 1065 if (bdrv_pwrite_sync( 1066 extent->file, 1067 ((int64_t)m_data->l2_offset * 512) 1068 + (m_data->l2_index * sizeof(offset)), 1069 &offset, sizeof(offset)) < 0) { 1070 return VMDK_ERROR; 1071 } 1072 } 1073 if (m_data->l2_cache_entry) { 1074 *m_data->l2_cache_entry = offset; 1075 } 1076 1077 return VMDK_OK; 1078 } 1079 1080 /** 1081 * get_cluster_offset 1082 * 1083 * Look up cluster offset in extent file by sector number, and store in 1084 * @cluster_offset. 1085 * 1086 * For flat extents, the start offset as parsed from the description file is 1087 * returned. 1088 * 1089 * For sparse extents, look up in L1, L2 table. If allocate is true, return an 1090 * offset for a new cluster and update L2 cache. If there is a backing file, 1091 * COW is done before returning; otherwise, zeroes are written to the allocated 1092 * cluster. Both COW and zero writing skips the sector range 1093 * [@skip_start_sector, @skip_end_sector) passed in by caller, because caller 1094 * has new data to write there. 1095 * 1096 * Returns: VMDK_OK if cluster exists and mapped in the image. 1097 * VMDK_UNALLOC if cluster is not mapped and @allocate is false. 1098 * VMDK_ERROR if failed. 1099 */ 1100 static int get_cluster_offset(BlockDriverState *bs, 1101 VmdkExtent *extent, 1102 VmdkMetaData *m_data, 1103 uint64_t offset, 1104 bool allocate, 1105 uint64_t *cluster_offset, 1106 uint64_t skip_start_sector, 1107 uint64_t skip_end_sector) 1108 { 1109 unsigned int l1_index, l2_offset, l2_index; 1110 int min_index, i, j; 1111 uint32_t min_count, *l2_table; 1112 bool zeroed = false; 1113 int64_t ret; 1114 int32_t cluster_sector; 1115 1116 if (m_data) { 1117 m_data->valid = 0; 1118 } 1119 if (extent->flat) { 1120 *cluster_offset = extent->flat_start_offset; 1121 return VMDK_OK; 1122 } 1123 1124 offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE; 1125 l1_index = (offset >> 9) / extent->l1_entry_sectors; 1126 if (l1_index >= extent->l1_size) { 1127 return VMDK_ERROR; 1128 } 1129 l2_offset = extent->l1_table[l1_index]; 1130 if (!l2_offset) { 1131 return VMDK_UNALLOC; 1132 } 1133 for (i = 0; i < L2_CACHE_SIZE; i++) { 1134 if (l2_offset == extent->l2_cache_offsets[i]) { 1135 /* increment the hit count */ 1136 if (++extent->l2_cache_counts[i] == 0xffffffff) { 1137 for (j = 0; j < L2_CACHE_SIZE; j++) { 1138 extent->l2_cache_counts[j] >>= 1; 1139 } 1140 } 1141 l2_table = extent->l2_cache + (i * extent->l2_size); 1142 goto found; 1143 } 1144 } 1145 /* not found: load a new entry in the least used one */ 1146 min_index = 0; 1147 min_count = 0xffffffff; 1148 for (i = 0; i < L2_CACHE_SIZE; i++) { 1149 if (extent->l2_cache_counts[i] < min_count) { 1150 min_count = extent->l2_cache_counts[i]; 1151 min_index = i; 1152 } 1153 } 1154 l2_table = extent->l2_cache + (min_index * extent->l2_size); 1155 if (bdrv_pread( 1156 extent->file, 1157 (int64_t)l2_offset * 512, 1158 l2_table, 1159 extent->l2_size * sizeof(uint32_t) 1160 ) != extent->l2_size * sizeof(uint32_t)) { 1161 return VMDK_ERROR; 1162 } 1163 1164 extent->l2_cache_offsets[min_index] = l2_offset; 1165 extent->l2_cache_counts[min_index] = 1; 1166 found: 1167 l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size; 1168 cluster_sector = le32_to_cpu(l2_table[l2_index]); 1169 1170 if (m_data) { 1171 m_data->valid = 1; 1172 m_data->l1_index = l1_index; 1173 m_data->l2_index = l2_index; 1174 m_data->l2_offset = l2_offset; 1175 m_data->l2_cache_entry = &l2_table[l2_index]; 1176 } 1177 if (extent->has_zero_grain && cluster_sector == VMDK_GTE_ZEROED) { 1178 zeroed = true; 1179 } 1180 1181 if (!cluster_sector || zeroed) { 1182 if (!allocate) { 1183 return zeroed ? VMDK_ZEROED : VMDK_UNALLOC; 1184 } 1185 1186 cluster_sector = extent->next_cluster_sector; 1187 extent->next_cluster_sector += extent->cluster_sectors; 1188 1189 /* First of all we write grain itself, to avoid race condition 1190 * that may to corrupt the image. 1191 * This problem may occur because of insufficient space on host disk 1192 * or inappropriate VM shutdown. 1193 */ 1194 ret = get_whole_cluster(bs, extent, 1195 cluster_sector, 1196 offset >> BDRV_SECTOR_BITS, 1197 skip_start_sector, skip_end_sector); 1198 if (ret) { 1199 return ret; 1200 } 1201 } 1202 *cluster_offset = cluster_sector << BDRV_SECTOR_BITS; 1203 return VMDK_OK; 1204 } 1205 1206 static VmdkExtent *find_extent(BDRVVmdkState *s, 1207 int64_t sector_num, VmdkExtent *start_hint) 1208 { 1209 VmdkExtent *extent = start_hint; 1210 1211 if (!extent) { 1212 extent = &s->extents[0]; 1213 } 1214 while (extent < &s->extents[s->num_extents]) { 1215 if (sector_num < extent->end_sector) { 1216 return extent; 1217 } 1218 extent++; 1219 } 1220 return NULL; 1221 } 1222 1223 static int64_t coroutine_fn vmdk_co_get_block_status(BlockDriverState *bs, 1224 int64_t sector_num, int nb_sectors, int *pnum) 1225 { 1226 BDRVVmdkState *s = bs->opaque; 1227 int64_t index_in_cluster, n, ret; 1228 uint64_t offset; 1229 VmdkExtent *extent; 1230 1231 extent = find_extent(s, sector_num, NULL); 1232 if (!extent) { 1233 return 0; 1234 } 1235 qemu_co_mutex_lock(&s->lock); 1236 ret = get_cluster_offset(bs, extent, NULL, 1237 sector_num * 512, false, &offset, 1238 0, 0); 1239 qemu_co_mutex_unlock(&s->lock); 1240 1241 switch (ret) { 1242 case VMDK_ERROR: 1243 ret = -EIO; 1244 break; 1245 case VMDK_UNALLOC: 1246 ret = 0; 1247 break; 1248 case VMDK_ZEROED: 1249 ret = BDRV_BLOCK_ZERO; 1250 break; 1251 case VMDK_OK: 1252 ret = BDRV_BLOCK_DATA; 1253 if (extent->file == bs->file && !extent->compressed) { 1254 ret |= BDRV_BLOCK_OFFSET_VALID | offset; 1255 } 1256 1257 break; 1258 } 1259 1260 index_in_cluster = sector_num % extent->cluster_sectors; 1261 n = extent->cluster_sectors - index_in_cluster; 1262 if (n > nb_sectors) { 1263 n = nb_sectors; 1264 } 1265 *pnum = n; 1266 return ret; 1267 } 1268 1269 static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset, 1270 int64_t offset_in_cluster, const uint8_t *buf, 1271 int nb_sectors, int64_t sector_num) 1272 { 1273 int ret; 1274 VmdkGrainMarker *data = NULL; 1275 uLongf buf_len; 1276 const uint8_t *write_buf = buf; 1277 int write_len = nb_sectors * 512; 1278 1279 if (extent->compressed) { 1280 if (!extent->has_marker) { 1281 ret = -EINVAL; 1282 goto out; 1283 } 1284 buf_len = (extent->cluster_sectors << 9) * 2; 1285 data = g_malloc(buf_len + sizeof(VmdkGrainMarker)); 1286 if (compress(data->data, &buf_len, buf, nb_sectors << 9) != Z_OK || 1287 buf_len == 0) { 1288 ret = -EINVAL; 1289 goto out; 1290 } 1291 data->lba = sector_num; 1292 data->size = buf_len; 1293 write_buf = (uint8_t *)data; 1294 write_len = buf_len + sizeof(VmdkGrainMarker); 1295 } 1296 ret = bdrv_pwrite(extent->file, 1297 cluster_offset + offset_in_cluster, 1298 write_buf, 1299 write_len); 1300 if (ret != write_len) { 1301 ret = ret < 0 ? ret : -EIO; 1302 goto out; 1303 } 1304 ret = 0; 1305 out: 1306 g_free(data); 1307 return ret; 1308 } 1309 1310 static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset, 1311 int64_t offset_in_cluster, uint8_t *buf, 1312 int nb_sectors) 1313 { 1314 int ret; 1315 int cluster_bytes, buf_bytes; 1316 uint8_t *cluster_buf, *compressed_data; 1317 uint8_t *uncomp_buf; 1318 uint32_t data_len; 1319 VmdkGrainMarker *marker; 1320 uLongf buf_len; 1321 1322 1323 if (!extent->compressed) { 1324 ret = bdrv_pread(extent->file, 1325 cluster_offset + offset_in_cluster, 1326 buf, nb_sectors * 512); 1327 if (ret == nb_sectors * 512) { 1328 return 0; 1329 } else { 1330 return -EIO; 1331 } 1332 } 1333 cluster_bytes = extent->cluster_sectors * 512; 1334 /* Read two clusters in case GrainMarker + compressed data > one cluster */ 1335 buf_bytes = cluster_bytes * 2; 1336 cluster_buf = g_malloc(buf_bytes); 1337 uncomp_buf = g_malloc(cluster_bytes); 1338 ret = bdrv_pread(extent->file, 1339 cluster_offset, 1340 cluster_buf, buf_bytes); 1341 if (ret < 0) { 1342 goto out; 1343 } 1344 compressed_data = cluster_buf; 1345 buf_len = cluster_bytes; 1346 data_len = cluster_bytes; 1347 if (extent->has_marker) { 1348 marker = (VmdkGrainMarker *)cluster_buf; 1349 compressed_data = marker->data; 1350 data_len = le32_to_cpu(marker->size); 1351 } 1352 if (!data_len || data_len > buf_bytes) { 1353 ret = -EINVAL; 1354 goto out; 1355 } 1356 ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len); 1357 if (ret != Z_OK) { 1358 ret = -EINVAL; 1359 goto out; 1360 1361 } 1362 if (offset_in_cluster < 0 || 1363 offset_in_cluster + nb_sectors * 512 > buf_len) { 1364 ret = -EINVAL; 1365 goto out; 1366 } 1367 memcpy(buf, uncomp_buf + offset_in_cluster, nb_sectors * 512); 1368 ret = 0; 1369 1370 out: 1371 g_free(uncomp_buf); 1372 g_free(cluster_buf); 1373 return ret; 1374 } 1375 1376 static int vmdk_read(BlockDriverState *bs, int64_t sector_num, 1377 uint8_t *buf, int nb_sectors) 1378 { 1379 BDRVVmdkState *s = bs->opaque; 1380 int ret; 1381 uint64_t n, index_in_cluster; 1382 uint64_t extent_begin_sector, extent_relative_sector_num; 1383 VmdkExtent *extent = NULL; 1384 uint64_t cluster_offset; 1385 1386 while (nb_sectors > 0) { 1387 extent = find_extent(s, sector_num, extent); 1388 if (!extent) { 1389 return -EIO; 1390 } 1391 ret = get_cluster_offset(bs, extent, NULL, 1392 sector_num << 9, false, &cluster_offset, 1393 0, 0); 1394 extent_begin_sector = extent->end_sector - extent->sectors; 1395 extent_relative_sector_num = sector_num - extent_begin_sector; 1396 index_in_cluster = extent_relative_sector_num % extent->cluster_sectors; 1397 n = extent->cluster_sectors - index_in_cluster; 1398 if (n > nb_sectors) { 1399 n = nb_sectors; 1400 } 1401 if (ret != VMDK_OK) { 1402 /* if not allocated, try to read from parent image, if exist */ 1403 if (bs->backing_hd && ret != VMDK_ZEROED) { 1404 if (!vmdk_is_cid_valid(bs)) { 1405 return -EINVAL; 1406 } 1407 ret = bdrv_read(bs->backing_hd, sector_num, buf, n); 1408 if (ret < 0) { 1409 return ret; 1410 } 1411 } else { 1412 memset(buf, 0, 512 * n); 1413 } 1414 } else { 1415 ret = vmdk_read_extent(extent, 1416 cluster_offset, index_in_cluster * 512, 1417 buf, n); 1418 if (ret) { 1419 return ret; 1420 } 1421 } 1422 nb_sectors -= n; 1423 sector_num += n; 1424 buf += n * 512; 1425 } 1426 return 0; 1427 } 1428 1429 static coroutine_fn int vmdk_co_read(BlockDriverState *bs, int64_t sector_num, 1430 uint8_t *buf, int nb_sectors) 1431 { 1432 int ret; 1433 BDRVVmdkState *s = bs->opaque; 1434 qemu_co_mutex_lock(&s->lock); 1435 ret = vmdk_read(bs, sector_num, buf, nb_sectors); 1436 qemu_co_mutex_unlock(&s->lock); 1437 return ret; 1438 } 1439 1440 /** 1441 * vmdk_write: 1442 * @zeroed: buf is ignored (data is zero), use zeroed_grain GTE feature 1443 * if possible, otherwise return -ENOTSUP. 1444 * @zero_dry_run: used for zeroed == true only, don't update L2 table, just try 1445 * with each cluster. By dry run we can find if the zero write 1446 * is possible without modifying image data. 1447 * 1448 * Returns: error code with 0 for success. 1449 */ 1450 static int vmdk_write(BlockDriverState *bs, int64_t sector_num, 1451 const uint8_t *buf, int nb_sectors, 1452 bool zeroed, bool zero_dry_run) 1453 { 1454 BDRVVmdkState *s = bs->opaque; 1455 VmdkExtent *extent = NULL; 1456 int ret; 1457 int64_t index_in_cluster, n; 1458 uint64_t extent_begin_sector, extent_relative_sector_num; 1459 uint64_t cluster_offset; 1460 VmdkMetaData m_data; 1461 1462 if (sector_num > bs->total_sectors) { 1463 error_report("Wrong offset: sector_num=0x%" PRIx64 1464 " total_sectors=0x%" PRIx64 "\n", 1465 sector_num, bs->total_sectors); 1466 return -EIO; 1467 } 1468 1469 while (nb_sectors > 0) { 1470 extent = find_extent(s, sector_num, extent); 1471 if (!extent) { 1472 return -EIO; 1473 } 1474 extent_begin_sector = extent->end_sector - extent->sectors; 1475 extent_relative_sector_num = sector_num - extent_begin_sector; 1476 index_in_cluster = extent_relative_sector_num % extent->cluster_sectors; 1477 n = extent->cluster_sectors - index_in_cluster; 1478 if (n > nb_sectors) { 1479 n = nb_sectors; 1480 } 1481 ret = get_cluster_offset(bs, extent, &m_data, sector_num << 9, 1482 !(extent->compressed || zeroed), 1483 &cluster_offset, 1484 index_in_cluster, index_in_cluster + n); 1485 if (extent->compressed) { 1486 if (ret == VMDK_OK) { 1487 /* Refuse write to allocated cluster for streamOptimized */ 1488 error_report("Could not write to allocated cluster" 1489 " for streamOptimized"); 1490 return -EIO; 1491 } else { 1492 /* allocate */ 1493 ret = get_cluster_offset(bs, extent, &m_data, sector_num << 9, 1494 true, &cluster_offset, 0, 0); 1495 } 1496 } 1497 if (ret == VMDK_ERROR) { 1498 return -EINVAL; 1499 } 1500 if (zeroed) { 1501 /* Do zeroed write, buf is ignored */ 1502 if (extent->has_zero_grain && 1503 index_in_cluster == 0 && 1504 n >= extent->cluster_sectors) { 1505 n = extent->cluster_sectors; 1506 if (!zero_dry_run) { 1507 /* update L2 tables */ 1508 if (vmdk_L2update(extent, &m_data, VMDK_GTE_ZEROED) 1509 != VMDK_OK) { 1510 return -EIO; 1511 } 1512 } 1513 } else { 1514 return -ENOTSUP; 1515 } 1516 } else { 1517 ret = vmdk_write_extent(extent, 1518 cluster_offset, index_in_cluster * 512, 1519 buf, n, sector_num); 1520 if (ret) { 1521 return ret; 1522 } 1523 if (m_data.valid) { 1524 /* update L2 tables */ 1525 if (vmdk_L2update(extent, &m_data, 1526 cluster_offset >> BDRV_SECTOR_BITS) 1527 != VMDK_OK) { 1528 return -EIO; 1529 } 1530 } 1531 } 1532 nb_sectors -= n; 1533 sector_num += n; 1534 buf += n * 512; 1535 1536 /* update CID on the first write every time the virtual disk is 1537 * opened */ 1538 if (!s->cid_updated) { 1539 ret = vmdk_write_cid(bs, time(NULL)); 1540 if (ret < 0) { 1541 return ret; 1542 } 1543 s->cid_updated = true; 1544 } 1545 } 1546 return 0; 1547 } 1548 1549 static coroutine_fn int vmdk_co_write(BlockDriverState *bs, int64_t sector_num, 1550 const uint8_t *buf, int nb_sectors) 1551 { 1552 int ret; 1553 BDRVVmdkState *s = bs->opaque; 1554 qemu_co_mutex_lock(&s->lock); 1555 ret = vmdk_write(bs, sector_num, buf, nb_sectors, false, false); 1556 qemu_co_mutex_unlock(&s->lock); 1557 return ret; 1558 } 1559 1560 static int vmdk_write_compressed(BlockDriverState *bs, 1561 int64_t sector_num, 1562 const uint8_t *buf, 1563 int nb_sectors) 1564 { 1565 BDRVVmdkState *s = bs->opaque; 1566 if (s->num_extents == 1 && s->extents[0].compressed) { 1567 return vmdk_write(bs, sector_num, buf, nb_sectors, false, false); 1568 } else { 1569 return -ENOTSUP; 1570 } 1571 } 1572 1573 static int coroutine_fn vmdk_co_write_zeroes(BlockDriverState *bs, 1574 int64_t sector_num, 1575 int nb_sectors, 1576 BdrvRequestFlags flags) 1577 { 1578 int ret; 1579 BDRVVmdkState *s = bs->opaque; 1580 qemu_co_mutex_lock(&s->lock); 1581 /* write zeroes could fail if sectors not aligned to cluster, test it with 1582 * dry_run == true before really updating image */ 1583 ret = vmdk_write(bs, sector_num, NULL, nb_sectors, true, true); 1584 if (!ret) { 1585 ret = vmdk_write(bs, sector_num, NULL, nb_sectors, true, false); 1586 } 1587 qemu_co_mutex_unlock(&s->lock); 1588 return ret; 1589 } 1590 1591 static int vmdk_create_extent(const char *filename, int64_t filesize, 1592 bool flat, bool compress, bool zeroed_grain, 1593 QemuOpts *opts, Error **errp) 1594 { 1595 int ret, i; 1596 BlockDriverState *bs = NULL; 1597 VMDK4Header header; 1598 Error *local_err = NULL; 1599 uint32_t tmp, magic, grains, gd_sectors, gt_size, gt_count; 1600 uint32_t *gd_buf = NULL; 1601 int gd_buf_size; 1602 1603 ret = bdrv_create_file(filename, opts, &local_err); 1604 if (ret < 0) { 1605 error_propagate(errp, local_err); 1606 goto exit; 1607 } 1608 1609 assert(bs == NULL); 1610 ret = bdrv_open(&bs, filename, NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL, 1611 NULL, &local_err); 1612 if (ret < 0) { 1613 error_propagate(errp, local_err); 1614 goto exit; 1615 } 1616 1617 if (flat) { 1618 ret = bdrv_truncate(bs, filesize); 1619 if (ret < 0) { 1620 error_setg_errno(errp, -ret, "Could not truncate file"); 1621 } 1622 goto exit; 1623 } 1624 magic = cpu_to_be32(VMDK4_MAGIC); 1625 memset(&header, 0, sizeof(header)); 1626 header.version = zeroed_grain ? 2 : 1; 1627 header.flags = VMDK4_FLAG_RGD | VMDK4_FLAG_NL_DETECT 1628 | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0) 1629 | (zeroed_grain ? VMDK4_FLAG_ZERO_GRAIN : 0); 1630 header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0; 1631 header.capacity = filesize / BDRV_SECTOR_SIZE; 1632 header.granularity = 128; 1633 header.num_gtes_per_gt = BDRV_SECTOR_SIZE; 1634 1635 grains = DIV_ROUND_UP(filesize / BDRV_SECTOR_SIZE, header.granularity); 1636 gt_size = DIV_ROUND_UP(header.num_gtes_per_gt * sizeof(uint32_t), 1637 BDRV_SECTOR_SIZE); 1638 gt_count = DIV_ROUND_UP(grains, header.num_gtes_per_gt); 1639 gd_sectors = DIV_ROUND_UP(gt_count * sizeof(uint32_t), BDRV_SECTOR_SIZE); 1640 1641 header.desc_offset = 1; 1642 header.desc_size = 20; 1643 header.rgd_offset = header.desc_offset + header.desc_size; 1644 header.gd_offset = header.rgd_offset + gd_sectors + (gt_size * gt_count); 1645 header.grain_offset = 1646 ROUND_UP(header.gd_offset + gd_sectors + (gt_size * gt_count), 1647 header.granularity); 1648 /* swap endianness for all header fields */ 1649 header.version = cpu_to_le32(header.version); 1650 header.flags = cpu_to_le32(header.flags); 1651 header.capacity = cpu_to_le64(header.capacity); 1652 header.granularity = cpu_to_le64(header.granularity); 1653 header.num_gtes_per_gt = cpu_to_le32(header.num_gtes_per_gt); 1654 header.desc_offset = cpu_to_le64(header.desc_offset); 1655 header.desc_size = cpu_to_le64(header.desc_size); 1656 header.rgd_offset = cpu_to_le64(header.rgd_offset); 1657 header.gd_offset = cpu_to_le64(header.gd_offset); 1658 header.grain_offset = cpu_to_le64(header.grain_offset); 1659 header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm); 1660 1661 header.check_bytes[0] = 0xa; 1662 header.check_bytes[1] = 0x20; 1663 header.check_bytes[2] = 0xd; 1664 header.check_bytes[3] = 0xa; 1665 1666 /* write all the data */ 1667 ret = bdrv_pwrite(bs, 0, &magic, sizeof(magic)); 1668 if (ret < 0) { 1669 error_set(errp, QERR_IO_ERROR); 1670 goto exit; 1671 } 1672 ret = bdrv_pwrite(bs, sizeof(magic), &header, sizeof(header)); 1673 if (ret < 0) { 1674 error_set(errp, QERR_IO_ERROR); 1675 goto exit; 1676 } 1677 1678 ret = bdrv_truncate(bs, le64_to_cpu(header.grain_offset) << 9); 1679 if (ret < 0) { 1680 error_setg_errno(errp, -ret, "Could not truncate file"); 1681 goto exit; 1682 } 1683 1684 /* write grain directory */ 1685 gd_buf_size = gd_sectors * BDRV_SECTOR_SIZE; 1686 gd_buf = g_malloc0(gd_buf_size); 1687 for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_sectors; 1688 i < gt_count; i++, tmp += gt_size) { 1689 gd_buf[i] = cpu_to_le32(tmp); 1690 } 1691 ret = bdrv_pwrite(bs, le64_to_cpu(header.rgd_offset) * BDRV_SECTOR_SIZE, 1692 gd_buf, gd_buf_size); 1693 if (ret < 0) { 1694 error_set(errp, QERR_IO_ERROR); 1695 goto exit; 1696 } 1697 1698 /* write backup grain directory */ 1699 for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_sectors; 1700 i < gt_count; i++, tmp += gt_size) { 1701 gd_buf[i] = cpu_to_le32(tmp); 1702 } 1703 ret = bdrv_pwrite(bs, le64_to_cpu(header.gd_offset) * BDRV_SECTOR_SIZE, 1704 gd_buf, gd_buf_size); 1705 if (ret < 0) { 1706 error_set(errp, QERR_IO_ERROR); 1707 goto exit; 1708 } 1709 1710 ret = 0; 1711 exit: 1712 if (bs) { 1713 bdrv_unref(bs); 1714 } 1715 g_free(gd_buf); 1716 return ret; 1717 } 1718 1719 static int filename_decompose(const char *filename, char *path, char *prefix, 1720 char *postfix, size_t buf_len, Error **errp) 1721 { 1722 const char *p, *q; 1723 1724 if (filename == NULL || !strlen(filename)) { 1725 error_setg(errp, "No filename provided"); 1726 return VMDK_ERROR; 1727 } 1728 p = strrchr(filename, '/'); 1729 if (p == NULL) { 1730 p = strrchr(filename, '\\'); 1731 } 1732 if (p == NULL) { 1733 p = strrchr(filename, ':'); 1734 } 1735 if (p != NULL) { 1736 p++; 1737 if (p - filename >= buf_len) { 1738 return VMDK_ERROR; 1739 } 1740 pstrcpy(path, p - filename + 1, filename); 1741 } else { 1742 p = filename; 1743 path[0] = '\0'; 1744 } 1745 q = strrchr(p, '.'); 1746 if (q == NULL) { 1747 pstrcpy(prefix, buf_len, p); 1748 postfix[0] = '\0'; 1749 } else { 1750 if (q - p >= buf_len) { 1751 return VMDK_ERROR; 1752 } 1753 pstrcpy(prefix, q - p + 1, p); 1754 pstrcpy(postfix, buf_len, q); 1755 } 1756 return VMDK_OK; 1757 } 1758 1759 static int vmdk_create(const char *filename, QemuOpts *opts, Error **errp) 1760 { 1761 int idx = 0; 1762 BlockDriverState *new_bs = NULL; 1763 Error *local_err = NULL; 1764 char *desc = NULL; 1765 int64_t total_size = 0, filesize; 1766 char *adapter_type = NULL; 1767 char *backing_file = NULL; 1768 char *fmt = NULL; 1769 int flags = 0; 1770 int ret = 0; 1771 bool flat, split, compress; 1772 GString *ext_desc_lines; 1773 char path[PATH_MAX], prefix[PATH_MAX], postfix[PATH_MAX]; 1774 const int64_t split_size = 0x80000000; /* VMDK has constant split size */ 1775 const char *desc_extent_line; 1776 char parent_desc_line[BUF_SIZE] = ""; 1777 uint32_t parent_cid = 0xffffffff; 1778 uint32_t number_heads = 16; 1779 bool zeroed_grain = false; 1780 uint32_t desc_offset = 0, desc_len; 1781 const char desc_template[] = 1782 "# Disk DescriptorFile\n" 1783 "version=1\n" 1784 "CID=%" PRIx32 "\n" 1785 "parentCID=%" PRIx32 "\n" 1786 "createType=\"%s\"\n" 1787 "%s" 1788 "\n" 1789 "# Extent description\n" 1790 "%s" 1791 "\n" 1792 "# The Disk Data Base\n" 1793 "#DDB\n" 1794 "\n" 1795 "ddb.virtualHWVersion = \"%d\"\n" 1796 "ddb.geometry.cylinders = \"%" PRId64 "\"\n" 1797 "ddb.geometry.heads = \"%" PRIu32 "\"\n" 1798 "ddb.geometry.sectors = \"63\"\n" 1799 "ddb.adapterType = \"%s\"\n"; 1800 1801 ext_desc_lines = g_string_new(NULL); 1802 1803 if (filename_decompose(filename, path, prefix, postfix, PATH_MAX, errp)) { 1804 ret = -EINVAL; 1805 goto exit; 1806 } 1807 /* Read out options */ 1808 total_size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0); 1809 adapter_type = qemu_opt_get_del(opts, BLOCK_OPT_ADAPTER_TYPE); 1810 backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE); 1811 if (qemu_opt_get_bool_del(opts, BLOCK_OPT_COMPAT6, false)) { 1812 flags |= BLOCK_FLAG_COMPAT6; 1813 } 1814 fmt = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT); 1815 if (qemu_opt_get_bool_del(opts, BLOCK_OPT_ZEROED_GRAIN, false)) { 1816 zeroed_grain = true; 1817 } 1818 1819 if (!adapter_type) { 1820 adapter_type = g_strdup("ide"); 1821 } else if (strcmp(adapter_type, "ide") && 1822 strcmp(adapter_type, "buslogic") && 1823 strcmp(adapter_type, "lsilogic") && 1824 strcmp(adapter_type, "legacyESX")) { 1825 error_setg(errp, "Unknown adapter type: '%s'", adapter_type); 1826 ret = -EINVAL; 1827 goto exit; 1828 } 1829 if (strcmp(adapter_type, "ide") != 0) { 1830 /* that's the number of heads with which vmware operates when 1831 creating, exporting, etc. vmdk files with a non-ide adapter type */ 1832 number_heads = 255; 1833 } 1834 if (!fmt) { 1835 /* Default format to monolithicSparse */ 1836 fmt = g_strdup("monolithicSparse"); 1837 } else if (strcmp(fmt, "monolithicFlat") && 1838 strcmp(fmt, "monolithicSparse") && 1839 strcmp(fmt, "twoGbMaxExtentSparse") && 1840 strcmp(fmt, "twoGbMaxExtentFlat") && 1841 strcmp(fmt, "streamOptimized")) { 1842 error_setg(errp, "Unknown subformat: '%s'", fmt); 1843 ret = -EINVAL; 1844 goto exit; 1845 } 1846 split = !(strcmp(fmt, "twoGbMaxExtentFlat") && 1847 strcmp(fmt, "twoGbMaxExtentSparse")); 1848 flat = !(strcmp(fmt, "monolithicFlat") && 1849 strcmp(fmt, "twoGbMaxExtentFlat")); 1850 compress = !strcmp(fmt, "streamOptimized"); 1851 if (flat) { 1852 desc_extent_line = "RW %" PRId64 " FLAT \"%s\" 0\n"; 1853 } else { 1854 desc_extent_line = "RW %" PRId64 " SPARSE \"%s\"\n"; 1855 } 1856 if (flat && backing_file) { 1857 error_setg(errp, "Flat image can't have backing file"); 1858 ret = -ENOTSUP; 1859 goto exit; 1860 } 1861 if (flat && zeroed_grain) { 1862 error_setg(errp, "Flat image can't enable zeroed grain"); 1863 ret = -ENOTSUP; 1864 goto exit; 1865 } 1866 if (backing_file) { 1867 BlockDriverState *bs = NULL; 1868 ret = bdrv_open(&bs, backing_file, NULL, NULL, BDRV_O_NO_BACKING, NULL, 1869 errp); 1870 if (ret != 0) { 1871 goto exit; 1872 } 1873 if (strcmp(bs->drv->format_name, "vmdk")) { 1874 bdrv_unref(bs); 1875 ret = -EINVAL; 1876 goto exit; 1877 } 1878 parent_cid = vmdk_read_cid(bs, 0); 1879 bdrv_unref(bs); 1880 snprintf(parent_desc_line, sizeof(parent_desc_line), 1881 "parentFileNameHint=\"%s\"", backing_file); 1882 } 1883 1884 /* Create extents */ 1885 filesize = total_size; 1886 while (filesize > 0) { 1887 char desc_line[BUF_SIZE]; 1888 char ext_filename[PATH_MAX]; 1889 char desc_filename[PATH_MAX]; 1890 int64_t size = filesize; 1891 1892 if (split && size > split_size) { 1893 size = split_size; 1894 } 1895 if (split) { 1896 snprintf(desc_filename, sizeof(desc_filename), "%s-%c%03d%s", 1897 prefix, flat ? 'f' : 's', ++idx, postfix); 1898 } else if (flat) { 1899 snprintf(desc_filename, sizeof(desc_filename), "%s-flat%s", 1900 prefix, postfix); 1901 } else { 1902 snprintf(desc_filename, sizeof(desc_filename), "%s%s", 1903 prefix, postfix); 1904 } 1905 snprintf(ext_filename, sizeof(ext_filename), "%s%s", 1906 path, desc_filename); 1907 1908 if (vmdk_create_extent(ext_filename, size, 1909 flat, compress, zeroed_grain, opts, errp)) { 1910 ret = -EINVAL; 1911 goto exit; 1912 } 1913 filesize -= size; 1914 1915 /* Format description line */ 1916 snprintf(desc_line, sizeof(desc_line), 1917 desc_extent_line, size / BDRV_SECTOR_SIZE, desc_filename); 1918 g_string_append(ext_desc_lines, desc_line); 1919 } 1920 /* generate descriptor file */ 1921 desc = g_strdup_printf(desc_template, 1922 (uint32_t)time(NULL), 1923 parent_cid, 1924 fmt, 1925 parent_desc_line, 1926 ext_desc_lines->str, 1927 (flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), 1928 total_size / 1929 (int64_t)(63 * number_heads * BDRV_SECTOR_SIZE), 1930 number_heads, 1931 adapter_type); 1932 desc_len = strlen(desc); 1933 /* the descriptor offset = 0x200 */ 1934 if (!split && !flat) { 1935 desc_offset = 0x200; 1936 } else { 1937 ret = bdrv_create_file(filename, opts, &local_err); 1938 if (ret < 0) { 1939 error_propagate(errp, local_err); 1940 goto exit; 1941 } 1942 } 1943 assert(new_bs == NULL); 1944 ret = bdrv_open(&new_bs, filename, NULL, NULL, 1945 BDRV_O_RDWR | BDRV_O_PROTOCOL, NULL, &local_err); 1946 if (ret < 0) { 1947 error_propagate(errp, local_err); 1948 goto exit; 1949 } 1950 ret = bdrv_pwrite(new_bs, desc_offset, desc, desc_len); 1951 if (ret < 0) { 1952 error_setg_errno(errp, -ret, "Could not write description"); 1953 goto exit; 1954 } 1955 /* bdrv_pwrite write padding zeros to align to sector, we don't need that 1956 * for description file */ 1957 if (desc_offset == 0) { 1958 ret = bdrv_truncate(new_bs, desc_len); 1959 if (ret < 0) { 1960 error_setg_errno(errp, -ret, "Could not truncate file"); 1961 } 1962 } 1963 exit: 1964 if (new_bs) { 1965 bdrv_unref(new_bs); 1966 } 1967 g_free(adapter_type); 1968 g_free(backing_file); 1969 g_free(fmt); 1970 g_free(desc); 1971 g_string_free(ext_desc_lines, true); 1972 return ret; 1973 } 1974 1975 static void vmdk_close(BlockDriverState *bs) 1976 { 1977 BDRVVmdkState *s = bs->opaque; 1978 1979 vmdk_free_extents(bs); 1980 g_free(s->create_type); 1981 1982 migrate_del_blocker(s->migration_blocker); 1983 error_free(s->migration_blocker); 1984 } 1985 1986 static coroutine_fn int vmdk_co_flush(BlockDriverState *bs) 1987 { 1988 BDRVVmdkState *s = bs->opaque; 1989 int i, err; 1990 int ret = 0; 1991 1992 for (i = 0; i < s->num_extents; i++) { 1993 err = bdrv_co_flush(s->extents[i].file); 1994 if (err < 0) { 1995 ret = err; 1996 } 1997 } 1998 return ret; 1999 } 2000 2001 static int64_t vmdk_get_allocated_file_size(BlockDriverState *bs) 2002 { 2003 int i; 2004 int64_t ret = 0; 2005 int64_t r; 2006 BDRVVmdkState *s = bs->opaque; 2007 2008 ret = bdrv_get_allocated_file_size(bs->file); 2009 if (ret < 0) { 2010 return ret; 2011 } 2012 for (i = 0; i < s->num_extents; i++) { 2013 if (s->extents[i].file == bs->file) { 2014 continue; 2015 } 2016 r = bdrv_get_allocated_file_size(s->extents[i].file); 2017 if (r < 0) { 2018 return r; 2019 } 2020 ret += r; 2021 } 2022 return ret; 2023 } 2024 2025 static int vmdk_has_zero_init(BlockDriverState *bs) 2026 { 2027 int i; 2028 BDRVVmdkState *s = bs->opaque; 2029 2030 /* If has a flat extent and its underlying storage doesn't have zero init, 2031 * return 0. */ 2032 for (i = 0; i < s->num_extents; i++) { 2033 if (s->extents[i].flat) { 2034 if (!bdrv_has_zero_init(s->extents[i].file)) { 2035 return 0; 2036 } 2037 } 2038 } 2039 return 1; 2040 } 2041 2042 static ImageInfo *vmdk_get_extent_info(VmdkExtent *extent) 2043 { 2044 ImageInfo *info = g_new0(ImageInfo, 1); 2045 2046 *info = (ImageInfo){ 2047 .filename = g_strdup(extent->file->filename), 2048 .format = g_strdup(extent->type), 2049 .virtual_size = extent->sectors * BDRV_SECTOR_SIZE, 2050 .compressed = extent->compressed, 2051 .has_compressed = extent->compressed, 2052 .cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE, 2053 .has_cluster_size = !extent->flat, 2054 }; 2055 2056 return info; 2057 } 2058 2059 static int vmdk_check(BlockDriverState *bs, BdrvCheckResult *result, 2060 BdrvCheckMode fix) 2061 { 2062 BDRVVmdkState *s = bs->opaque; 2063 VmdkExtent *extent = NULL; 2064 int64_t sector_num = 0; 2065 int64_t total_sectors = bdrv_nb_sectors(bs); 2066 int ret; 2067 uint64_t cluster_offset; 2068 2069 if (fix) { 2070 return -ENOTSUP; 2071 } 2072 2073 for (;;) { 2074 if (sector_num >= total_sectors) { 2075 return 0; 2076 } 2077 extent = find_extent(s, sector_num, extent); 2078 if (!extent) { 2079 fprintf(stderr, 2080 "ERROR: could not find extent for sector %" PRId64 "\n", 2081 sector_num); 2082 break; 2083 } 2084 ret = get_cluster_offset(bs, extent, NULL, 2085 sector_num << BDRV_SECTOR_BITS, 2086 false, &cluster_offset, 0, 0); 2087 if (ret == VMDK_ERROR) { 2088 fprintf(stderr, 2089 "ERROR: could not get cluster_offset for sector %" 2090 PRId64 "\n", sector_num); 2091 break; 2092 } 2093 if (ret == VMDK_OK && cluster_offset >= bdrv_getlength(extent->file)) { 2094 fprintf(stderr, 2095 "ERROR: cluster offset for sector %" 2096 PRId64 " points after EOF\n", sector_num); 2097 break; 2098 } 2099 sector_num += extent->cluster_sectors; 2100 } 2101 2102 result->corruptions++; 2103 return 0; 2104 } 2105 2106 static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs) 2107 { 2108 int i; 2109 BDRVVmdkState *s = bs->opaque; 2110 ImageInfoSpecific *spec_info = g_new0(ImageInfoSpecific, 1); 2111 ImageInfoList **next; 2112 2113 *spec_info = (ImageInfoSpecific){ 2114 .kind = IMAGE_INFO_SPECIFIC_KIND_VMDK, 2115 { 2116 .vmdk = g_new0(ImageInfoSpecificVmdk, 1), 2117 }, 2118 }; 2119 2120 *spec_info->vmdk = (ImageInfoSpecificVmdk) { 2121 .create_type = g_strdup(s->create_type), 2122 .cid = s->cid, 2123 .parent_cid = s->parent_cid, 2124 }; 2125 2126 next = &spec_info->vmdk->extents; 2127 for (i = 0; i < s->num_extents; i++) { 2128 *next = g_new0(ImageInfoList, 1); 2129 (*next)->value = vmdk_get_extent_info(&s->extents[i]); 2130 (*next)->next = NULL; 2131 next = &(*next)->next; 2132 } 2133 2134 return spec_info; 2135 } 2136 2137 static int vmdk_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 2138 { 2139 int i; 2140 BDRVVmdkState *s = bs->opaque; 2141 assert(s->num_extents); 2142 bdi->needs_compressed_writes = s->extents[0].compressed; 2143 if (!s->extents[0].flat) { 2144 bdi->cluster_size = s->extents[0].cluster_sectors << BDRV_SECTOR_BITS; 2145 } 2146 /* See if we have multiple extents but they have different cases */ 2147 for (i = 1; i < s->num_extents; i++) { 2148 if (bdi->needs_compressed_writes != s->extents[i].compressed || 2149 (bdi->cluster_size && bdi->cluster_size != 2150 s->extents[i].cluster_sectors << BDRV_SECTOR_BITS)) { 2151 return -ENOTSUP; 2152 } 2153 } 2154 return 0; 2155 } 2156 2157 static void vmdk_detach_aio_context(BlockDriverState *bs) 2158 { 2159 BDRVVmdkState *s = bs->opaque; 2160 int i; 2161 2162 for (i = 0; i < s->num_extents; i++) { 2163 bdrv_detach_aio_context(s->extents[i].file); 2164 } 2165 } 2166 2167 static void vmdk_attach_aio_context(BlockDriverState *bs, 2168 AioContext *new_context) 2169 { 2170 BDRVVmdkState *s = bs->opaque; 2171 int i; 2172 2173 for (i = 0; i < s->num_extents; i++) { 2174 bdrv_attach_aio_context(s->extents[i].file, new_context); 2175 } 2176 } 2177 2178 static QemuOptsList vmdk_create_opts = { 2179 .name = "vmdk-create-opts", 2180 .head = QTAILQ_HEAD_INITIALIZER(vmdk_create_opts.head), 2181 .desc = { 2182 { 2183 .name = BLOCK_OPT_SIZE, 2184 .type = QEMU_OPT_SIZE, 2185 .help = "Virtual disk size" 2186 }, 2187 { 2188 .name = BLOCK_OPT_ADAPTER_TYPE, 2189 .type = QEMU_OPT_STRING, 2190 .help = "Virtual adapter type, can be one of " 2191 "ide (default), lsilogic, buslogic or legacyESX" 2192 }, 2193 { 2194 .name = BLOCK_OPT_BACKING_FILE, 2195 .type = QEMU_OPT_STRING, 2196 .help = "File name of a base image" 2197 }, 2198 { 2199 .name = BLOCK_OPT_COMPAT6, 2200 .type = QEMU_OPT_BOOL, 2201 .help = "VMDK version 6 image", 2202 .def_value_str = "off" 2203 }, 2204 { 2205 .name = BLOCK_OPT_SUBFMT, 2206 .type = QEMU_OPT_STRING, 2207 .help = 2208 "VMDK flat extent format, can be one of " 2209 "{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} " 2210 }, 2211 { 2212 .name = BLOCK_OPT_ZEROED_GRAIN, 2213 .type = QEMU_OPT_BOOL, 2214 .help = "Enable efficient zero writes " 2215 "using the zeroed-grain GTE feature" 2216 }, 2217 { /* end of list */ } 2218 } 2219 }; 2220 2221 static BlockDriver bdrv_vmdk = { 2222 .format_name = "vmdk", 2223 .instance_size = sizeof(BDRVVmdkState), 2224 .bdrv_probe = vmdk_probe, 2225 .bdrv_open = vmdk_open, 2226 .bdrv_check = vmdk_check, 2227 .bdrv_reopen_prepare = vmdk_reopen_prepare, 2228 .bdrv_read = vmdk_co_read, 2229 .bdrv_write = vmdk_co_write, 2230 .bdrv_write_compressed = vmdk_write_compressed, 2231 .bdrv_co_write_zeroes = vmdk_co_write_zeroes, 2232 .bdrv_close = vmdk_close, 2233 .bdrv_create = vmdk_create, 2234 .bdrv_co_flush_to_disk = vmdk_co_flush, 2235 .bdrv_co_get_block_status = vmdk_co_get_block_status, 2236 .bdrv_get_allocated_file_size = vmdk_get_allocated_file_size, 2237 .bdrv_has_zero_init = vmdk_has_zero_init, 2238 .bdrv_get_specific_info = vmdk_get_specific_info, 2239 .bdrv_refresh_limits = vmdk_refresh_limits, 2240 .bdrv_get_info = vmdk_get_info, 2241 .bdrv_detach_aio_context = vmdk_detach_aio_context, 2242 .bdrv_attach_aio_context = vmdk_attach_aio_context, 2243 2244 .supports_backing = true, 2245 .create_opts = &vmdk_create_opts, 2246 }; 2247 2248 static void bdrv_vmdk_init(void) 2249 { 2250 bdrv_register(&bdrv_vmdk); 2251 } 2252 2253 block_init(bdrv_vmdk_init); 2254