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/osdep.h" 27 #include "qapi/error.h" 28 #include "block/block_int.h" 29 #include "sysemu/block-backend.h" 30 #include "qapi/qmp/qerror.h" 31 #include "qemu/error-report.h" 32 #include "qemu/module.h" 33 #include "qemu/bswap.h" 34 #include "migration/blocker.h" 35 #include "qemu/cutils.h" 36 #include <zlib.h> 37 38 #define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D') 39 #define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V') 40 #define VMDK4_COMPRESSION_DEFLATE 1 41 #define VMDK4_FLAG_NL_DETECT (1 << 0) 42 #define VMDK4_FLAG_RGD (1 << 1) 43 /* Zeroed-grain enable bit */ 44 #define VMDK4_FLAG_ZERO_GRAIN (1 << 2) 45 #define VMDK4_FLAG_COMPRESS (1 << 16) 46 #define VMDK4_FLAG_MARKER (1 << 17) 47 #define VMDK4_GD_AT_END 0xffffffffffffffffULL 48 49 #define VMDK_GTE_ZEROED 0x1 50 51 /* VMDK internal error codes */ 52 #define VMDK_OK 0 53 #define VMDK_ERROR (-1) 54 /* Cluster not allocated */ 55 #define VMDK_UNALLOC (-2) 56 #define VMDK_ZEROED (-3) 57 58 #define BLOCK_OPT_ZEROED_GRAIN "zeroed_grain" 59 60 typedef struct { 61 uint32_t version; 62 uint32_t flags; 63 uint32_t disk_sectors; 64 uint32_t granularity; 65 uint32_t l1dir_offset; 66 uint32_t l1dir_size; 67 uint32_t file_sectors; 68 uint32_t cylinders; 69 uint32_t heads; 70 uint32_t sectors_per_track; 71 } QEMU_PACKED VMDK3Header; 72 73 typedef struct { 74 uint32_t version; 75 uint32_t flags; 76 uint64_t capacity; 77 uint64_t granularity; 78 uint64_t desc_offset; 79 uint64_t desc_size; 80 /* Number of GrainTableEntries per GrainTable */ 81 uint32_t num_gtes_per_gt; 82 uint64_t rgd_offset; 83 uint64_t gd_offset; 84 uint64_t grain_offset; 85 char filler[1]; 86 char check_bytes[4]; 87 uint16_t compressAlgorithm; 88 } QEMU_PACKED VMDK4Header; 89 90 #define L2_CACHE_SIZE 16 91 92 typedef struct VmdkExtent { 93 BdrvChild *file; 94 bool flat; 95 bool compressed; 96 bool has_marker; 97 bool has_zero_grain; 98 int version; 99 int64_t sectors; 100 int64_t end_sector; 101 int64_t flat_start_offset; 102 int64_t l1_table_offset; 103 int64_t l1_backup_table_offset; 104 uint32_t *l1_table; 105 uint32_t *l1_backup_table; 106 unsigned int l1_size; 107 uint32_t l1_entry_sectors; 108 109 unsigned int l2_size; 110 uint32_t *l2_cache; 111 uint32_t l2_cache_offsets[L2_CACHE_SIZE]; 112 uint32_t l2_cache_counts[L2_CACHE_SIZE]; 113 114 int64_t cluster_sectors; 115 int64_t next_cluster_sector; 116 char *type; 117 } VmdkExtent; 118 119 typedef struct BDRVVmdkState { 120 CoMutex lock; 121 uint64_t desc_offset; 122 bool cid_updated; 123 bool cid_checked; 124 uint32_t cid; 125 uint32_t parent_cid; 126 int num_extents; 127 /* Extent array with num_extents entries, ascend ordered by address */ 128 VmdkExtent *extents; 129 Error *migration_blocker; 130 char *create_type; 131 } BDRVVmdkState; 132 133 typedef struct VmdkMetaData { 134 unsigned int l1_index; 135 unsigned int l2_index; 136 unsigned int l2_offset; 137 int valid; 138 uint32_t *l2_cache_entry; 139 } VmdkMetaData; 140 141 typedef struct VmdkGrainMarker { 142 uint64_t lba; 143 uint32_t size; 144 uint8_t data[0]; 145 } QEMU_PACKED VmdkGrainMarker; 146 147 enum { 148 MARKER_END_OF_STREAM = 0, 149 MARKER_GRAIN_TABLE = 1, 150 MARKER_GRAIN_DIRECTORY = 2, 151 MARKER_FOOTER = 3, 152 }; 153 154 static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename) 155 { 156 uint32_t magic; 157 158 if (buf_size < 4) { 159 return 0; 160 } 161 magic = be32_to_cpu(*(uint32_t *)buf); 162 if (magic == VMDK3_MAGIC || 163 magic == VMDK4_MAGIC) { 164 return 100; 165 } else { 166 const char *p = (const char *)buf; 167 const char *end = p + buf_size; 168 while (p < end) { 169 if (*p == '#') { 170 /* skip comment line */ 171 while (p < end && *p != '\n') { 172 p++; 173 } 174 p++; 175 continue; 176 } 177 if (*p == ' ') { 178 while (p < end && *p == ' ') { 179 p++; 180 } 181 /* skip '\r' if windows line endings used. */ 182 if (p < end && *p == '\r') { 183 p++; 184 } 185 /* only accept blank lines before 'version=' line */ 186 if (p == end || *p != '\n') { 187 return 0; 188 } 189 p++; 190 continue; 191 } 192 if (end - p >= strlen("version=X\n")) { 193 if (strncmp("version=1\n", p, strlen("version=1\n")) == 0 || 194 strncmp("version=2\n", p, strlen("version=2\n")) == 0) { 195 return 100; 196 } 197 } 198 if (end - p >= strlen("version=X\r\n")) { 199 if (strncmp("version=1\r\n", p, strlen("version=1\r\n")) == 0 || 200 strncmp("version=2\r\n", p, strlen("version=2\r\n")) == 0) { 201 return 100; 202 } 203 } 204 return 0; 205 } 206 return 0; 207 } 208 } 209 210 #define SECTOR_SIZE 512 211 #define DESC_SIZE (20 * SECTOR_SIZE) /* 20 sectors of 512 bytes each */ 212 #define BUF_SIZE 4096 213 #define HEADER_SIZE 512 /* first sector of 512 bytes */ 214 215 static void vmdk_free_extents(BlockDriverState *bs) 216 { 217 int i; 218 BDRVVmdkState *s = bs->opaque; 219 VmdkExtent *e; 220 221 for (i = 0; i < s->num_extents; i++) { 222 e = &s->extents[i]; 223 g_free(e->l1_table); 224 g_free(e->l2_cache); 225 g_free(e->l1_backup_table); 226 g_free(e->type); 227 if (e->file != bs->file) { 228 bdrv_unref_child(bs, e->file); 229 } 230 } 231 g_free(s->extents); 232 } 233 234 static void vmdk_free_last_extent(BlockDriverState *bs) 235 { 236 BDRVVmdkState *s = bs->opaque; 237 238 if (s->num_extents == 0) { 239 return; 240 } 241 s->num_extents--; 242 s->extents = g_renew(VmdkExtent, s->extents, s->num_extents); 243 } 244 245 static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) 246 { 247 char *desc; 248 uint32_t cid = 0xffffffff; 249 const char *p_name, *cid_str; 250 size_t cid_str_size; 251 BDRVVmdkState *s = bs->opaque; 252 int ret; 253 254 desc = g_malloc0(DESC_SIZE); 255 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); 256 if (ret < 0) { 257 g_free(desc); 258 return 0; 259 } 260 261 if (parent) { 262 cid_str = "parentCID"; 263 cid_str_size = sizeof("parentCID"); 264 } else { 265 cid_str = "CID"; 266 cid_str_size = sizeof("CID"); 267 } 268 269 desc[DESC_SIZE - 1] = '\0'; 270 p_name = strstr(desc, cid_str); 271 if (p_name != NULL) { 272 p_name += cid_str_size; 273 sscanf(p_name, "%" SCNx32, &cid); 274 } 275 276 g_free(desc); 277 return cid; 278 } 279 280 static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) 281 { 282 char *desc, *tmp_desc; 283 char *p_name, *tmp_str; 284 BDRVVmdkState *s = bs->opaque; 285 int ret = 0; 286 287 desc = g_malloc0(DESC_SIZE); 288 tmp_desc = g_malloc0(DESC_SIZE); 289 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); 290 if (ret < 0) { 291 goto out; 292 } 293 294 desc[DESC_SIZE - 1] = '\0'; 295 tmp_str = strstr(desc, "parentCID"); 296 if (tmp_str == NULL) { 297 ret = -EINVAL; 298 goto out; 299 } 300 301 pstrcpy(tmp_desc, DESC_SIZE, tmp_str); 302 p_name = strstr(desc, "CID"); 303 if (p_name != NULL) { 304 p_name += sizeof("CID"); 305 snprintf(p_name, DESC_SIZE - (p_name - desc), "%" PRIx32 "\n", cid); 306 pstrcat(desc, DESC_SIZE, tmp_desc); 307 } 308 309 ret = bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE); 310 311 out: 312 g_free(desc); 313 g_free(tmp_desc); 314 return ret; 315 } 316 317 static int vmdk_is_cid_valid(BlockDriverState *bs) 318 { 319 BDRVVmdkState *s = bs->opaque; 320 uint32_t cur_pcid; 321 322 if (!s->cid_checked && bs->backing) { 323 BlockDriverState *p_bs = bs->backing->bs; 324 325 cur_pcid = vmdk_read_cid(p_bs, 0); 326 if (s->parent_cid != cur_pcid) { 327 /* CID not valid */ 328 return 0; 329 } 330 } 331 s->cid_checked = true; 332 /* CID valid */ 333 return 1; 334 } 335 336 /* We have nothing to do for VMDK reopen, stubs just return success */ 337 static int vmdk_reopen_prepare(BDRVReopenState *state, 338 BlockReopenQueue *queue, Error **errp) 339 { 340 assert(state != NULL); 341 assert(state->bs != NULL); 342 return 0; 343 } 344 345 static int vmdk_parent_open(BlockDriverState *bs) 346 { 347 char *p_name; 348 char *desc; 349 BDRVVmdkState *s = bs->opaque; 350 int ret; 351 352 desc = g_malloc0(DESC_SIZE + 1); 353 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); 354 if (ret < 0) { 355 goto out; 356 } 357 ret = 0; 358 359 p_name = strstr(desc, "parentFileNameHint"); 360 if (p_name != NULL) { 361 char *end_name; 362 363 p_name += sizeof("parentFileNameHint") + 1; 364 end_name = strchr(p_name, '\"'); 365 if (end_name == NULL) { 366 ret = -EINVAL; 367 goto out; 368 } 369 if ((end_name - p_name) > sizeof(bs->backing_file) - 1) { 370 ret = -EINVAL; 371 goto out; 372 } 373 374 pstrcpy(bs->backing_file, end_name - p_name + 1, p_name); 375 } 376 377 out: 378 g_free(desc); 379 return ret; 380 } 381 382 /* Create and append extent to the extent array. Return the added VmdkExtent 383 * address. return NULL if allocation failed. */ 384 static int vmdk_add_extent(BlockDriverState *bs, 385 BdrvChild *file, bool flat, int64_t sectors, 386 int64_t l1_offset, int64_t l1_backup_offset, 387 uint32_t l1_size, 388 int l2_size, uint64_t cluster_sectors, 389 VmdkExtent **new_extent, 390 Error **errp) 391 { 392 VmdkExtent *extent; 393 BDRVVmdkState *s = bs->opaque; 394 int64_t nb_sectors; 395 396 if (cluster_sectors > 0x200000) { 397 /* 0x200000 * 512Bytes = 1GB for one cluster is unrealistic */ 398 error_setg(errp, "Invalid granularity, image may be corrupt"); 399 return -EFBIG; 400 } 401 if (l1_size > 512 * 1024 * 1024) { 402 /* Although with big capacity and small l1_entry_sectors, we can get a 403 * big l1_size, we don't want unbounded value to allocate the table. 404 * Limit it to 512M, which is 16PB for default cluster and L2 table 405 * size */ 406 error_setg(errp, "L1 size too big"); 407 return -EFBIG; 408 } 409 410 nb_sectors = bdrv_nb_sectors(file->bs); 411 if (nb_sectors < 0) { 412 return nb_sectors; 413 } 414 415 s->extents = g_renew(VmdkExtent, s->extents, s->num_extents + 1); 416 extent = &s->extents[s->num_extents]; 417 s->num_extents++; 418 419 memset(extent, 0, sizeof(VmdkExtent)); 420 extent->file = file; 421 extent->flat = flat; 422 extent->sectors = sectors; 423 extent->l1_table_offset = l1_offset; 424 extent->l1_backup_table_offset = l1_backup_offset; 425 extent->l1_size = l1_size; 426 extent->l1_entry_sectors = l2_size * cluster_sectors; 427 extent->l2_size = l2_size; 428 extent->cluster_sectors = flat ? sectors : cluster_sectors; 429 extent->next_cluster_sector = ROUND_UP(nb_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 size_t l1_size; 448 int i; 449 450 /* read the L1 table */ 451 l1_size = extent->l1_size * sizeof(uint32_t); 452 extent->l1_table = g_try_malloc(l1_size); 453 if (l1_size && extent->l1_table == NULL) { 454 return -ENOMEM; 455 } 456 457 ret = bdrv_pread(extent->file, 458 extent->l1_table_offset, 459 extent->l1_table, 460 l1_size); 461 if (ret < 0) { 462 error_setg_errno(errp, -ret, 463 "Could not read l1 table from extent '%s'", 464 extent->file->bs->filename); 465 goto fail_l1; 466 } 467 for (i = 0; i < extent->l1_size; i++) { 468 le32_to_cpus(&extent->l1_table[i]); 469 } 470 471 if (extent->l1_backup_table_offset) { 472 extent->l1_backup_table = g_try_malloc(l1_size); 473 if (l1_size && extent->l1_backup_table == NULL) { 474 ret = -ENOMEM; 475 goto fail_l1; 476 } 477 ret = bdrv_pread(extent->file, 478 extent->l1_backup_table_offset, 479 extent->l1_backup_table, 480 l1_size); 481 if (ret < 0) { 482 error_setg_errno(errp, -ret, 483 "Could not read l1 backup table from extent '%s'", 484 extent->file->bs->filename); 485 goto fail_l1b; 486 } 487 for (i = 0; i < extent->l1_size; i++) { 488 le32_to_cpus(&extent->l1_backup_table[i]); 489 } 490 } 491 492 extent->l2_cache = 493 g_new(uint32_t, extent->l2_size * L2_CACHE_SIZE); 494 return 0; 495 fail_l1b: 496 g_free(extent->l1_backup_table); 497 fail_l1: 498 g_free(extent->l1_table); 499 return ret; 500 } 501 502 static int vmdk_open_vmfs_sparse(BlockDriverState *bs, 503 BdrvChild *file, 504 int flags, Error **errp) 505 { 506 int ret; 507 uint32_t magic; 508 VMDK3Header header; 509 VmdkExtent *extent; 510 511 ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); 512 if (ret < 0) { 513 error_setg_errno(errp, -ret, 514 "Could not read header from file '%s'", 515 file->bs->filename); 516 return ret; 517 } 518 ret = vmdk_add_extent(bs, file, false, 519 le32_to_cpu(header.disk_sectors), 520 (int64_t)le32_to_cpu(header.l1dir_offset) << 9, 521 0, 522 le32_to_cpu(header.l1dir_size), 523 4096, 524 le32_to_cpu(header.granularity), 525 &extent, 526 errp); 527 if (ret < 0) { 528 return ret; 529 } 530 ret = vmdk_init_tables(bs, extent, errp); 531 if (ret) { 532 /* free extent allocated by vmdk_add_extent */ 533 vmdk_free_last_extent(bs); 534 } 535 return ret; 536 } 537 538 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf, 539 QDict *options, Error **errp); 540 541 static char *vmdk_read_desc(BdrvChild *file, uint64_t desc_offset, Error **errp) 542 { 543 int64_t size; 544 char *buf; 545 int ret; 546 547 size = bdrv_getlength(file->bs); 548 if (size < 0) { 549 error_setg_errno(errp, -size, "Could not access file"); 550 return NULL; 551 } 552 553 if (size < 4) { 554 /* Both descriptor file and sparse image must be much larger than 4 555 * bytes, also callers of vmdk_read_desc want to compare the first 4 556 * bytes with VMDK4_MAGIC, let's error out if less is read. */ 557 error_setg(errp, "File is too small, not a valid image"); 558 return NULL; 559 } 560 561 size = MIN(size, (1 << 20) - 1); /* avoid unbounded allocation */ 562 buf = g_malloc(size + 1); 563 564 ret = bdrv_pread(file, desc_offset, buf, size); 565 if (ret < 0) { 566 error_setg_errno(errp, -ret, "Could not read from file"); 567 g_free(buf); 568 return NULL; 569 } 570 buf[ret] = 0; 571 572 return buf; 573 } 574 575 static int vmdk_open_vmdk4(BlockDriverState *bs, 576 BdrvChild *file, 577 int flags, QDict *options, Error **errp) 578 { 579 int ret; 580 uint32_t magic; 581 uint32_t l1_size, l1_entry_sectors; 582 VMDK4Header header; 583 VmdkExtent *extent; 584 BDRVVmdkState *s = bs->opaque; 585 int64_t l1_backup_offset = 0; 586 bool compressed; 587 588 ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); 589 if (ret < 0) { 590 error_setg_errno(errp, -ret, 591 "Could not read header from file '%s'", 592 file->bs->filename); 593 return -EINVAL; 594 } 595 if (header.capacity == 0) { 596 uint64_t desc_offset = le64_to_cpu(header.desc_offset); 597 if (desc_offset) { 598 char *buf = vmdk_read_desc(file, desc_offset << 9, errp); 599 if (!buf) { 600 return -EINVAL; 601 } 602 ret = vmdk_open_desc_file(bs, flags, buf, options, errp); 603 g_free(buf); 604 return ret; 605 } 606 } 607 608 if (!s->create_type) { 609 s->create_type = g_strdup("monolithicSparse"); 610 } 611 612 if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) { 613 /* 614 * The footer takes precedence over the header, so read it in. The 615 * footer starts at offset -1024 from the end: One sector for the 616 * footer, and another one for the end-of-stream marker. 617 */ 618 struct { 619 struct { 620 uint64_t val; 621 uint32_t size; 622 uint32_t type; 623 uint8_t pad[512 - 16]; 624 } QEMU_PACKED footer_marker; 625 626 uint32_t magic; 627 VMDK4Header header; 628 uint8_t pad[512 - 4 - sizeof(VMDK4Header)]; 629 630 struct { 631 uint64_t val; 632 uint32_t size; 633 uint32_t type; 634 uint8_t pad[512 - 16]; 635 } QEMU_PACKED eos_marker; 636 } QEMU_PACKED footer; 637 638 ret = bdrv_pread(file, 639 bs->file->bs->total_sectors * 512 - 1536, 640 &footer, sizeof(footer)); 641 if (ret < 0) { 642 error_setg_errno(errp, -ret, "Failed to read footer"); 643 return ret; 644 } 645 646 /* Some sanity checks for the footer */ 647 if (be32_to_cpu(footer.magic) != VMDK4_MAGIC || 648 le32_to_cpu(footer.footer_marker.size) != 0 || 649 le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER || 650 le64_to_cpu(footer.eos_marker.val) != 0 || 651 le32_to_cpu(footer.eos_marker.size) != 0 || 652 le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM) 653 { 654 error_setg(errp, "Invalid footer"); 655 return -EINVAL; 656 } 657 658 header = footer.header; 659 } 660 661 compressed = 662 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; 663 if (le32_to_cpu(header.version) > 3) { 664 error_setg(errp, "Unsupported VMDK version %" PRIu32, 665 le32_to_cpu(header.version)); 666 return -ENOTSUP; 667 } else if (le32_to_cpu(header.version) == 3 && (flags & BDRV_O_RDWR) && 668 !compressed) { 669 /* VMware KB 2064959 explains that version 3 added support for 670 * persistent changed block tracking (CBT), and backup software can 671 * read it as version=1 if it doesn't care about the changed area 672 * information. So we are safe to enable read only. */ 673 error_setg(errp, "VMDK version 3 must be read only"); 674 return -EINVAL; 675 } 676 677 if (le32_to_cpu(header.num_gtes_per_gt) > 512) { 678 error_setg(errp, "L2 table size too big"); 679 return -EINVAL; 680 } 681 682 l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gt) 683 * le64_to_cpu(header.granularity); 684 if (l1_entry_sectors == 0) { 685 error_setg(errp, "L1 entry size is invalid"); 686 return -EINVAL; 687 } 688 l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1) 689 / l1_entry_sectors; 690 if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) { 691 l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9; 692 } 693 if (bdrv_nb_sectors(file->bs) < le64_to_cpu(header.grain_offset)) { 694 error_setg(errp, "File truncated, expecting at least %" PRId64 " bytes", 695 (int64_t)(le64_to_cpu(header.grain_offset) 696 * BDRV_SECTOR_SIZE)); 697 return -EINVAL; 698 } 699 700 ret = vmdk_add_extent(bs, file, false, 701 le64_to_cpu(header.capacity), 702 le64_to_cpu(header.gd_offset) << 9, 703 l1_backup_offset, 704 l1_size, 705 le32_to_cpu(header.num_gtes_per_gt), 706 le64_to_cpu(header.granularity), 707 &extent, 708 errp); 709 if (ret < 0) { 710 return ret; 711 } 712 extent->compressed = 713 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; 714 if (extent->compressed) { 715 g_free(s->create_type); 716 s->create_type = g_strdup("streamOptimized"); 717 } 718 extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER; 719 extent->version = le32_to_cpu(header.version); 720 extent->has_zero_grain = le32_to_cpu(header.flags) & VMDK4_FLAG_ZERO_GRAIN; 721 ret = vmdk_init_tables(bs, extent, errp); 722 if (ret) { 723 /* free extent allocated by vmdk_add_extent */ 724 vmdk_free_last_extent(bs); 725 } 726 return ret; 727 } 728 729 /* find an option value out of descriptor file */ 730 static int vmdk_parse_description(const char *desc, const char *opt_name, 731 char *buf, int buf_size) 732 { 733 char *opt_pos, *opt_end; 734 const char *end = desc + strlen(desc); 735 736 opt_pos = strstr(desc, opt_name); 737 if (!opt_pos) { 738 return VMDK_ERROR; 739 } 740 /* Skip "=\"" following opt_name */ 741 opt_pos += strlen(opt_name) + 2; 742 if (opt_pos >= end) { 743 return VMDK_ERROR; 744 } 745 opt_end = opt_pos; 746 while (opt_end < end && *opt_end != '"') { 747 opt_end++; 748 } 749 if (opt_end == end || buf_size < opt_end - opt_pos + 1) { 750 return VMDK_ERROR; 751 } 752 pstrcpy(buf, opt_end - opt_pos + 1, opt_pos); 753 return VMDK_OK; 754 } 755 756 /* Open an extent file and append to bs array */ 757 static int vmdk_open_sparse(BlockDriverState *bs, BdrvChild *file, int flags, 758 char *buf, QDict *options, Error **errp) 759 { 760 uint32_t magic; 761 762 magic = ldl_be_p(buf); 763 switch (magic) { 764 case VMDK3_MAGIC: 765 return vmdk_open_vmfs_sparse(bs, file, flags, errp); 766 break; 767 case VMDK4_MAGIC: 768 return vmdk_open_vmdk4(bs, file, flags, options, errp); 769 break; 770 default: 771 error_setg(errp, "Image not in VMDK format"); 772 return -EINVAL; 773 break; 774 } 775 } 776 777 static const char *next_line(const char *s) 778 { 779 while (*s) { 780 if (*s == '\n') { 781 return s + 1; 782 } 783 s++; 784 } 785 return s; 786 } 787 788 static int vmdk_parse_extents(const char *desc, BlockDriverState *bs, 789 const char *desc_file_path, QDict *options, 790 Error **errp) 791 { 792 int ret; 793 int matches; 794 char access[11]; 795 char type[11]; 796 char fname[512]; 797 const char *p, *np; 798 int64_t sectors = 0; 799 int64_t flat_offset; 800 char *extent_path; 801 BdrvChild *extent_file; 802 BDRVVmdkState *s = bs->opaque; 803 VmdkExtent *extent; 804 char extent_opt_prefix[32]; 805 Error *local_err = NULL; 806 807 for (p = desc; *p; p = next_line(p)) { 808 /* parse extent line in one of below formats: 809 * 810 * RW [size in sectors] FLAT "file-name.vmdk" OFFSET 811 * RW [size in sectors] SPARSE "file-name.vmdk" 812 * RW [size in sectors] VMFS "file-name.vmdk" 813 * RW [size in sectors] VMFSSPARSE "file-name.vmdk" 814 */ 815 flat_offset = -1; 816 matches = sscanf(p, "%10s %" SCNd64 " %10s \"%511[^\n\r\"]\" %" SCNd64, 817 access, §ors, type, fname, &flat_offset); 818 if (matches < 4 || strcmp(access, "RW")) { 819 continue; 820 } else if (!strcmp(type, "FLAT")) { 821 if (matches != 5 || flat_offset < 0) { 822 goto invalid; 823 } 824 } else if (!strcmp(type, "VMFS")) { 825 if (matches == 4) { 826 flat_offset = 0; 827 } else { 828 goto invalid; 829 } 830 } else if (matches != 4) { 831 goto invalid; 832 } 833 834 if (sectors <= 0 || 835 (strcmp(type, "FLAT") && strcmp(type, "SPARSE") && 836 strcmp(type, "VMFS") && strcmp(type, "VMFSSPARSE")) || 837 (strcmp(access, "RW"))) { 838 continue; 839 } 840 841 if (!path_is_absolute(fname) && !path_has_protocol(fname) && 842 !desc_file_path[0]) 843 { 844 error_setg(errp, "Cannot use relative extent paths with VMDK " 845 "descriptor file '%s'", bs->file->bs->filename); 846 return -EINVAL; 847 } 848 849 extent_path = g_malloc0(PATH_MAX); 850 path_combine(extent_path, PATH_MAX, desc_file_path, fname); 851 852 ret = snprintf(extent_opt_prefix, 32, "extents.%d", s->num_extents); 853 assert(ret < 32); 854 855 extent_file = bdrv_open_child(extent_path, options, extent_opt_prefix, 856 bs, &child_file, false, &local_err); 857 g_free(extent_path); 858 if (local_err) { 859 error_propagate(errp, local_err); 860 return -EINVAL; 861 } 862 863 /* save to extents array */ 864 if (!strcmp(type, "FLAT") || !strcmp(type, "VMFS")) { 865 /* FLAT extent */ 866 867 ret = vmdk_add_extent(bs, extent_file, true, sectors, 868 0, 0, 0, 0, 0, &extent, errp); 869 if (ret < 0) { 870 bdrv_unref_child(bs, extent_file); 871 return ret; 872 } 873 extent->flat_start_offset = flat_offset << 9; 874 } else if (!strcmp(type, "SPARSE") || !strcmp(type, "VMFSSPARSE")) { 875 /* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/ 876 char *buf = vmdk_read_desc(extent_file, 0, errp); 877 if (!buf) { 878 ret = -EINVAL; 879 } else { 880 ret = vmdk_open_sparse(bs, extent_file, bs->open_flags, buf, 881 options, errp); 882 } 883 g_free(buf); 884 if (ret) { 885 bdrv_unref_child(bs, extent_file); 886 return ret; 887 } 888 extent = &s->extents[s->num_extents - 1]; 889 } else { 890 error_setg(errp, "Unsupported extent type '%s'", type); 891 bdrv_unref_child(bs, extent_file); 892 return -ENOTSUP; 893 } 894 extent->type = g_strdup(type); 895 } 896 return 0; 897 898 invalid: 899 np = next_line(p); 900 assert(np != p); 901 if (np[-1] == '\n') { 902 np--; 903 } 904 error_setg(errp, "Invalid extent line: %.*s", (int)(np - p), p); 905 return -EINVAL; 906 } 907 908 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf, 909 QDict *options, Error **errp) 910 { 911 int ret; 912 char ct[128]; 913 BDRVVmdkState *s = bs->opaque; 914 915 if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) { 916 error_setg(errp, "invalid VMDK image descriptor"); 917 ret = -EINVAL; 918 goto exit; 919 } 920 if (strcmp(ct, "monolithicFlat") && 921 strcmp(ct, "vmfs") && 922 strcmp(ct, "vmfsSparse") && 923 strcmp(ct, "twoGbMaxExtentSparse") && 924 strcmp(ct, "twoGbMaxExtentFlat")) { 925 error_setg(errp, "Unsupported image type '%s'", ct); 926 ret = -ENOTSUP; 927 goto exit; 928 } 929 s->create_type = g_strdup(ct); 930 s->desc_offset = 0; 931 ret = vmdk_parse_extents(buf, bs, bs->file->bs->exact_filename, options, 932 errp); 933 exit: 934 return ret; 935 } 936 937 static int vmdk_open(BlockDriverState *bs, QDict *options, int flags, 938 Error **errp) 939 { 940 char *buf; 941 int ret; 942 BDRVVmdkState *s = bs->opaque; 943 uint32_t magic; 944 Error *local_err = NULL; 945 946 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 947 false, errp); 948 if (!bs->file) { 949 return -EINVAL; 950 } 951 952 buf = vmdk_read_desc(bs->file, 0, errp); 953 if (!buf) { 954 return -EINVAL; 955 } 956 957 magic = ldl_be_p(buf); 958 switch (magic) { 959 case VMDK3_MAGIC: 960 case VMDK4_MAGIC: 961 ret = vmdk_open_sparse(bs, bs->file, flags, buf, options, 962 errp); 963 s->desc_offset = 0x200; 964 break; 965 default: 966 ret = vmdk_open_desc_file(bs, flags, buf, options, errp); 967 break; 968 } 969 if (ret) { 970 goto fail; 971 } 972 973 /* try to open parent images, if exist */ 974 ret = vmdk_parent_open(bs); 975 if (ret) { 976 goto fail; 977 } 978 s->cid = vmdk_read_cid(bs, 0); 979 s->parent_cid = vmdk_read_cid(bs, 1); 980 qemu_co_mutex_init(&s->lock); 981 982 /* Disable migration when VMDK images are used */ 983 error_setg(&s->migration_blocker, "The vmdk format used by node '%s' " 984 "does not support live migration", 985 bdrv_get_device_or_node_name(bs)); 986 ret = migrate_add_blocker(s->migration_blocker, &local_err); 987 if (local_err) { 988 error_propagate(errp, local_err); 989 error_free(s->migration_blocker); 990 goto fail; 991 } 992 993 g_free(buf); 994 return 0; 995 996 fail: 997 g_free(buf); 998 g_free(s->create_type); 999 s->create_type = NULL; 1000 vmdk_free_extents(bs); 1001 return ret; 1002 } 1003 1004 1005 static void vmdk_refresh_limits(BlockDriverState *bs, Error **errp) 1006 { 1007 BDRVVmdkState *s = bs->opaque; 1008 int i; 1009 1010 for (i = 0; i < s->num_extents; i++) { 1011 if (!s->extents[i].flat) { 1012 bs->bl.pwrite_zeroes_alignment = 1013 MAX(bs->bl.pwrite_zeroes_alignment, 1014 s->extents[i].cluster_sectors << BDRV_SECTOR_BITS); 1015 } 1016 } 1017 } 1018 1019 /** 1020 * get_whole_cluster 1021 * 1022 * Copy backing file's cluster that covers @sector_num, otherwise write zero, 1023 * to the cluster at @cluster_sector_num. 1024 * 1025 * If @skip_start_sector < @skip_end_sector, the relative range 1026 * [@skip_start_sector, @skip_end_sector) is not copied or written, and leave 1027 * it for call to write user data in the request. 1028 */ 1029 static int get_whole_cluster(BlockDriverState *bs, 1030 VmdkExtent *extent, 1031 uint64_t cluster_offset, 1032 uint64_t offset, 1033 uint64_t skip_start_bytes, 1034 uint64_t skip_end_bytes) 1035 { 1036 int ret = VMDK_OK; 1037 int64_t cluster_bytes; 1038 uint8_t *whole_grain; 1039 1040 /* For COW, align request sector_num to cluster start */ 1041 cluster_bytes = extent->cluster_sectors << BDRV_SECTOR_BITS; 1042 offset = QEMU_ALIGN_DOWN(offset, cluster_bytes); 1043 whole_grain = qemu_blockalign(bs, cluster_bytes); 1044 1045 if (!bs->backing) { 1046 memset(whole_grain, 0, skip_start_bytes); 1047 memset(whole_grain + skip_end_bytes, 0, cluster_bytes - skip_end_bytes); 1048 } 1049 1050 assert(skip_end_bytes <= cluster_bytes); 1051 /* we will be here if it's first write on non-exist grain(cluster). 1052 * try to read from parent image, if exist */ 1053 if (bs->backing && !vmdk_is_cid_valid(bs)) { 1054 ret = VMDK_ERROR; 1055 goto exit; 1056 } 1057 1058 /* Read backing data before skip range */ 1059 if (skip_start_bytes > 0) { 1060 if (bs->backing) { 1061 ret = bdrv_pread(bs->backing, offset, whole_grain, 1062 skip_start_bytes); 1063 if (ret < 0) { 1064 ret = VMDK_ERROR; 1065 goto exit; 1066 } 1067 } 1068 ret = bdrv_pwrite(extent->file, cluster_offset, whole_grain, 1069 skip_start_bytes); 1070 if (ret < 0) { 1071 ret = VMDK_ERROR; 1072 goto exit; 1073 } 1074 } 1075 /* Read backing data after skip range */ 1076 if (skip_end_bytes < cluster_bytes) { 1077 if (bs->backing) { 1078 ret = bdrv_pread(bs->backing, offset + skip_end_bytes, 1079 whole_grain + skip_end_bytes, 1080 cluster_bytes - skip_end_bytes); 1081 if (ret < 0) { 1082 ret = VMDK_ERROR; 1083 goto exit; 1084 } 1085 } 1086 ret = bdrv_pwrite(extent->file, cluster_offset + skip_end_bytes, 1087 whole_grain + skip_end_bytes, 1088 cluster_bytes - skip_end_bytes); 1089 if (ret < 0) { 1090 ret = VMDK_ERROR; 1091 goto exit; 1092 } 1093 } 1094 1095 ret = VMDK_OK; 1096 exit: 1097 qemu_vfree(whole_grain); 1098 return ret; 1099 } 1100 1101 static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data, 1102 uint32_t offset) 1103 { 1104 offset = cpu_to_le32(offset); 1105 /* update L2 table */ 1106 if (bdrv_pwrite_sync(extent->file, 1107 ((int64_t)m_data->l2_offset * 512) 1108 + (m_data->l2_index * sizeof(offset)), 1109 &offset, sizeof(offset)) < 0) { 1110 return VMDK_ERROR; 1111 } 1112 /* update backup L2 table */ 1113 if (extent->l1_backup_table_offset != 0) { 1114 m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; 1115 if (bdrv_pwrite_sync(extent->file, 1116 ((int64_t)m_data->l2_offset * 512) 1117 + (m_data->l2_index * sizeof(offset)), 1118 &offset, sizeof(offset)) < 0) { 1119 return VMDK_ERROR; 1120 } 1121 } 1122 if (m_data->l2_cache_entry) { 1123 *m_data->l2_cache_entry = offset; 1124 } 1125 1126 return VMDK_OK; 1127 } 1128 1129 /** 1130 * get_cluster_offset 1131 * 1132 * Look up cluster offset in extent file by sector number, and store in 1133 * @cluster_offset. 1134 * 1135 * For flat extents, the start offset as parsed from the description file is 1136 * returned. 1137 * 1138 * For sparse extents, look up in L1, L2 table. If allocate is true, return an 1139 * offset for a new cluster and update L2 cache. If there is a backing file, 1140 * COW is done before returning; otherwise, zeroes are written to the allocated 1141 * cluster. Both COW and zero writing skips the sector range 1142 * [@skip_start_sector, @skip_end_sector) passed in by caller, because caller 1143 * has new data to write there. 1144 * 1145 * Returns: VMDK_OK if cluster exists and mapped in the image. 1146 * VMDK_UNALLOC if cluster is not mapped and @allocate is false. 1147 * VMDK_ERROR if failed. 1148 */ 1149 static int get_cluster_offset(BlockDriverState *bs, 1150 VmdkExtent *extent, 1151 VmdkMetaData *m_data, 1152 uint64_t offset, 1153 bool allocate, 1154 uint64_t *cluster_offset, 1155 uint64_t skip_start_bytes, 1156 uint64_t skip_end_bytes) 1157 { 1158 unsigned int l1_index, l2_offset, l2_index; 1159 int min_index, i, j; 1160 uint32_t min_count, *l2_table; 1161 bool zeroed = false; 1162 int64_t ret; 1163 int64_t cluster_sector; 1164 1165 if (m_data) { 1166 m_data->valid = 0; 1167 } 1168 if (extent->flat) { 1169 *cluster_offset = extent->flat_start_offset; 1170 return VMDK_OK; 1171 } 1172 1173 offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE; 1174 l1_index = (offset >> 9) / extent->l1_entry_sectors; 1175 if (l1_index >= extent->l1_size) { 1176 return VMDK_ERROR; 1177 } 1178 l2_offset = extent->l1_table[l1_index]; 1179 if (!l2_offset) { 1180 return VMDK_UNALLOC; 1181 } 1182 for (i = 0; i < L2_CACHE_SIZE; i++) { 1183 if (l2_offset == extent->l2_cache_offsets[i]) { 1184 /* increment the hit count */ 1185 if (++extent->l2_cache_counts[i] == 0xffffffff) { 1186 for (j = 0; j < L2_CACHE_SIZE; j++) { 1187 extent->l2_cache_counts[j] >>= 1; 1188 } 1189 } 1190 l2_table = extent->l2_cache + (i * extent->l2_size); 1191 goto found; 1192 } 1193 } 1194 /* not found: load a new entry in the least used one */ 1195 min_index = 0; 1196 min_count = 0xffffffff; 1197 for (i = 0; i < L2_CACHE_SIZE; i++) { 1198 if (extent->l2_cache_counts[i] < min_count) { 1199 min_count = extent->l2_cache_counts[i]; 1200 min_index = i; 1201 } 1202 } 1203 l2_table = extent->l2_cache + (min_index * extent->l2_size); 1204 if (bdrv_pread(extent->file, 1205 (int64_t)l2_offset * 512, 1206 l2_table, 1207 extent->l2_size * sizeof(uint32_t) 1208 ) != extent->l2_size * sizeof(uint32_t)) { 1209 return VMDK_ERROR; 1210 } 1211 1212 extent->l2_cache_offsets[min_index] = l2_offset; 1213 extent->l2_cache_counts[min_index] = 1; 1214 found: 1215 l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size; 1216 cluster_sector = le32_to_cpu(l2_table[l2_index]); 1217 1218 if (extent->has_zero_grain && cluster_sector == VMDK_GTE_ZEROED) { 1219 zeroed = true; 1220 } 1221 1222 if (!cluster_sector || zeroed) { 1223 if (!allocate) { 1224 return zeroed ? VMDK_ZEROED : VMDK_UNALLOC; 1225 } 1226 1227 cluster_sector = extent->next_cluster_sector; 1228 extent->next_cluster_sector += extent->cluster_sectors; 1229 1230 /* First of all we write grain itself, to avoid race condition 1231 * that may to corrupt the image. 1232 * This problem may occur because of insufficient space on host disk 1233 * or inappropriate VM shutdown. 1234 */ 1235 ret = get_whole_cluster(bs, extent, cluster_sector * BDRV_SECTOR_SIZE, 1236 offset, skip_start_bytes, skip_end_bytes); 1237 if (ret) { 1238 return ret; 1239 } 1240 if (m_data) { 1241 m_data->valid = 1; 1242 m_data->l1_index = l1_index; 1243 m_data->l2_index = l2_index; 1244 m_data->l2_offset = l2_offset; 1245 m_data->l2_cache_entry = &l2_table[l2_index]; 1246 } 1247 } 1248 *cluster_offset = cluster_sector << BDRV_SECTOR_BITS; 1249 return VMDK_OK; 1250 } 1251 1252 static VmdkExtent *find_extent(BDRVVmdkState *s, 1253 int64_t sector_num, VmdkExtent *start_hint) 1254 { 1255 VmdkExtent *extent = start_hint; 1256 1257 if (!extent) { 1258 extent = &s->extents[0]; 1259 } 1260 while (extent < &s->extents[s->num_extents]) { 1261 if (sector_num < extent->end_sector) { 1262 return extent; 1263 } 1264 extent++; 1265 } 1266 return NULL; 1267 } 1268 1269 static inline uint64_t vmdk_find_offset_in_cluster(VmdkExtent *extent, 1270 int64_t offset) 1271 { 1272 uint64_t extent_begin_offset, extent_relative_offset; 1273 uint64_t cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE; 1274 1275 extent_begin_offset = 1276 (extent->end_sector - extent->sectors) * BDRV_SECTOR_SIZE; 1277 extent_relative_offset = offset - extent_begin_offset; 1278 return extent_relative_offset % cluster_size; 1279 } 1280 1281 static inline uint64_t vmdk_find_index_in_cluster(VmdkExtent *extent, 1282 int64_t sector_num) 1283 { 1284 uint64_t offset; 1285 offset = vmdk_find_offset_in_cluster(extent, sector_num * BDRV_SECTOR_SIZE); 1286 return offset / BDRV_SECTOR_SIZE; 1287 } 1288 1289 static int64_t coroutine_fn vmdk_co_get_block_status(BlockDriverState *bs, 1290 int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) 1291 { 1292 BDRVVmdkState *s = bs->opaque; 1293 int64_t index_in_cluster, n, ret; 1294 uint64_t offset; 1295 VmdkExtent *extent; 1296 1297 extent = find_extent(s, sector_num, NULL); 1298 if (!extent) { 1299 return 0; 1300 } 1301 qemu_co_mutex_lock(&s->lock); 1302 ret = get_cluster_offset(bs, extent, NULL, 1303 sector_num * 512, false, &offset, 1304 0, 0); 1305 qemu_co_mutex_unlock(&s->lock); 1306 1307 index_in_cluster = vmdk_find_index_in_cluster(extent, sector_num); 1308 switch (ret) { 1309 case VMDK_ERROR: 1310 ret = -EIO; 1311 break; 1312 case VMDK_UNALLOC: 1313 ret = 0; 1314 break; 1315 case VMDK_ZEROED: 1316 ret = BDRV_BLOCK_ZERO; 1317 break; 1318 case VMDK_OK: 1319 ret = BDRV_BLOCK_DATA; 1320 if (!extent->compressed) { 1321 ret |= BDRV_BLOCK_OFFSET_VALID; 1322 ret |= (offset + (index_in_cluster << BDRV_SECTOR_BITS)) 1323 & BDRV_BLOCK_OFFSET_MASK; 1324 } 1325 *file = extent->file->bs; 1326 break; 1327 } 1328 1329 n = extent->cluster_sectors - index_in_cluster; 1330 if (n > nb_sectors) { 1331 n = nb_sectors; 1332 } 1333 *pnum = n; 1334 return ret; 1335 } 1336 1337 static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset, 1338 int64_t offset_in_cluster, QEMUIOVector *qiov, 1339 uint64_t qiov_offset, uint64_t n_bytes, 1340 uint64_t offset) 1341 { 1342 int ret; 1343 VmdkGrainMarker *data = NULL; 1344 uLongf buf_len; 1345 QEMUIOVector local_qiov; 1346 struct iovec iov; 1347 int64_t write_offset; 1348 int64_t write_end_sector; 1349 1350 if (extent->compressed) { 1351 void *compressed_data; 1352 1353 if (!extent->has_marker) { 1354 ret = -EINVAL; 1355 goto out; 1356 } 1357 buf_len = (extent->cluster_sectors << 9) * 2; 1358 data = g_malloc(buf_len + sizeof(VmdkGrainMarker)); 1359 1360 compressed_data = g_malloc(n_bytes); 1361 qemu_iovec_to_buf(qiov, qiov_offset, compressed_data, n_bytes); 1362 ret = compress(data->data, &buf_len, compressed_data, n_bytes); 1363 g_free(compressed_data); 1364 1365 if (ret != Z_OK || buf_len == 0) { 1366 ret = -EINVAL; 1367 goto out; 1368 } 1369 1370 data->lba = cpu_to_le64(offset >> BDRV_SECTOR_BITS); 1371 data->size = cpu_to_le32(buf_len); 1372 1373 n_bytes = buf_len + sizeof(VmdkGrainMarker); 1374 iov = (struct iovec) { 1375 .iov_base = data, 1376 .iov_len = n_bytes, 1377 }; 1378 qemu_iovec_init_external(&local_qiov, &iov, 1); 1379 } else { 1380 qemu_iovec_init(&local_qiov, qiov->niov); 1381 qemu_iovec_concat(&local_qiov, qiov, qiov_offset, n_bytes); 1382 } 1383 1384 write_offset = cluster_offset + offset_in_cluster, 1385 ret = bdrv_co_pwritev(extent->file, write_offset, n_bytes, 1386 &local_qiov, 0); 1387 1388 write_end_sector = DIV_ROUND_UP(write_offset + n_bytes, BDRV_SECTOR_SIZE); 1389 1390 if (extent->compressed) { 1391 extent->next_cluster_sector = write_end_sector; 1392 } else { 1393 extent->next_cluster_sector = MAX(extent->next_cluster_sector, 1394 write_end_sector); 1395 } 1396 1397 if (ret < 0) { 1398 goto out; 1399 } 1400 ret = 0; 1401 out: 1402 g_free(data); 1403 if (!extent->compressed) { 1404 qemu_iovec_destroy(&local_qiov); 1405 } 1406 return ret; 1407 } 1408 1409 static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset, 1410 int64_t offset_in_cluster, QEMUIOVector *qiov, 1411 int bytes) 1412 { 1413 int ret; 1414 int cluster_bytes, buf_bytes; 1415 uint8_t *cluster_buf, *compressed_data; 1416 uint8_t *uncomp_buf; 1417 uint32_t data_len; 1418 VmdkGrainMarker *marker; 1419 uLongf buf_len; 1420 1421 1422 if (!extent->compressed) { 1423 ret = bdrv_co_preadv(extent->file, 1424 cluster_offset + offset_in_cluster, bytes, 1425 qiov, 0); 1426 if (ret < 0) { 1427 return ret; 1428 } 1429 return 0; 1430 } 1431 cluster_bytes = extent->cluster_sectors * 512; 1432 /* Read two clusters in case GrainMarker + compressed data > one cluster */ 1433 buf_bytes = cluster_bytes * 2; 1434 cluster_buf = g_malloc(buf_bytes); 1435 uncomp_buf = g_malloc(cluster_bytes); 1436 ret = bdrv_pread(extent->file, 1437 cluster_offset, 1438 cluster_buf, buf_bytes); 1439 if (ret < 0) { 1440 goto out; 1441 } 1442 compressed_data = cluster_buf; 1443 buf_len = cluster_bytes; 1444 data_len = cluster_bytes; 1445 if (extent->has_marker) { 1446 marker = (VmdkGrainMarker *)cluster_buf; 1447 compressed_data = marker->data; 1448 data_len = le32_to_cpu(marker->size); 1449 } 1450 if (!data_len || data_len > buf_bytes) { 1451 ret = -EINVAL; 1452 goto out; 1453 } 1454 ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len); 1455 if (ret != Z_OK) { 1456 ret = -EINVAL; 1457 goto out; 1458 1459 } 1460 if (offset_in_cluster < 0 || 1461 offset_in_cluster + bytes > buf_len) { 1462 ret = -EINVAL; 1463 goto out; 1464 } 1465 qemu_iovec_from_buf(qiov, 0, uncomp_buf + offset_in_cluster, bytes); 1466 ret = 0; 1467 1468 out: 1469 g_free(uncomp_buf); 1470 g_free(cluster_buf); 1471 return ret; 1472 } 1473 1474 static int coroutine_fn 1475 vmdk_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes, 1476 QEMUIOVector *qiov, int flags) 1477 { 1478 BDRVVmdkState *s = bs->opaque; 1479 int ret; 1480 uint64_t n_bytes, offset_in_cluster; 1481 VmdkExtent *extent = NULL; 1482 QEMUIOVector local_qiov; 1483 uint64_t cluster_offset; 1484 uint64_t bytes_done = 0; 1485 1486 qemu_iovec_init(&local_qiov, qiov->niov); 1487 qemu_co_mutex_lock(&s->lock); 1488 1489 while (bytes > 0) { 1490 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent); 1491 if (!extent) { 1492 ret = -EIO; 1493 goto fail; 1494 } 1495 ret = get_cluster_offset(bs, extent, NULL, 1496 offset, false, &cluster_offset, 0, 0); 1497 offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset); 1498 1499 n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE 1500 - offset_in_cluster); 1501 1502 if (ret != VMDK_OK) { 1503 /* if not allocated, try to read from parent image, if exist */ 1504 if (bs->backing && ret != VMDK_ZEROED) { 1505 if (!vmdk_is_cid_valid(bs)) { 1506 ret = -EINVAL; 1507 goto fail; 1508 } 1509 1510 qemu_iovec_reset(&local_qiov); 1511 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); 1512 1513 ret = bdrv_co_preadv(bs->backing, offset, n_bytes, 1514 &local_qiov, 0); 1515 if (ret < 0) { 1516 goto fail; 1517 } 1518 } else { 1519 qemu_iovec_memset(qiov, bytes_done, 0, n_bytes); 1520 } 1521 } else { 1522 qemu_iovec_reset(&local_qiov); 1523 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); 1524 1525 ret = vmdk_read_extent(extent, cluster_offset, offset_in_cluster, 1526 &local_qiov, n_bytes); 1527 if (ret) { 1528 goto fail; 1529 } 1530 } 1531 bytes -= n_bytes; 1532 offset += n_bytes; 1533 bytes_done += n_bytes; 1534 } 1535 1536 ret = 0; 1537 fail: 1538 qemu_co_mutex_unlock(&s->lock); 1539 qemu_iovec_destroy(&local_qiov); 1540 1541 return ret; 1542 } 1543 1544 /** 1545 * vmdk_write: 1546 * @zeroed: buf is ignored (data is zero), use zeroed_grain GTE feature 1547 * if possible, otherwise return -ENOTSUP. 1548 * @zero_dry_run: used for zeroed == true only, don't update L2 table, just try 1549 * with each cluster. By dry run we can find if the zero write 1550 * is possible without modifying image data. 1551 * 1552 * Returns: error code with 0 for success. 1553 */ 1554 static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset, 1555 uint64_t bytes, QEMUIOVector *qiov, 1556 bool zeroed, bool zero_dry_run) 1557 { 1558 BDRVVmdkState *s = bs->opaque; 1559 VmdkExtent *extent = NULL; 1560 int ret; 1561 int64_t offset_in_cluster, n_bytes; 1562 uint64_t cluster_offset; 1563 uint64_t bytes_done = 0; 1564 VmdkMetaData m_data; 1565 1566 if (DIV_ROUND_UP(offset, BDRV_SECTOR_SIZE) > bs->total_sectors) { 1567 error_report("Wrong offset: offset=0x%" PRIx64 1568 " total_sectors=0x%" PRIx64, 1569 offset, bs->total_sectors); 1570 return -EIO; 1571 } 1572 1573 while (bytes > 0) { 1574 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent); 1575 if (!extent) { 1576 return -EIO; 1577 } 1578 offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset); 1579 n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE 1580 - offset_in_cluster); 1581 1582 ret = get_cluster_offset(bs, extent, &m_data, offset, 1583 !(extent->compressed || zeroed), 1584 &cluster_offset, offset_in_cluster, 1585 offset_in_cluster + n_bytes); 1586 if (extent->compressed) { 1587 if (ret == VMDK_OK) { 1588 /* Refuse write to allocated cluster for streamOptimized */ 1589 error_report("Could not write to allocated cluster" 1590 " for streamOptimized"); 1591 return -EIO; 1592 } else { 1593 /* allocate */ 1594 ret = get_cluster_offset(bs, extent, &m_data, offset, 1595 true, &cluster_offset, 0, 0); 1596 } 1597 } 1598 if (ret == VMDK_ERROR) { 1599 return -EINVAL; 1600 } 1601 if (zeroed) { 1602 /* Do zeroed write, buf is ignored */ 1603 if (extent->has_zero_grain && 1604 offset_in_cluster == 0 && 1605 n_bytes >= extent->cluster_sectors * BDRV_SECTOR_SIZE) { 1606 n_bytes = extent->cluster_sectors * BDRV_SECTOR_SIZE; 1607 if (!zero_dry_run) { 1608 /* update L2 tables */ 1609 if (vmdk_L2update(extent, &m_data, VMDK_GTE_ZEROED) 1610 != VMDK_OK) { 1611 return -EIO; 1612 } 1613 } 1614 } else { 1615 return -ENOTSUP; 1616 } 1617 } else { 1618 ret = vmdk_write_extent(extent, cluster_offset, offset_in_cluster, 1619 qiov, bytes_done, n_bytes, offset); 1620 if (ret) { 1621 return ret; 1622 } 1623 if (m_data.valid) { 1624 /* update L2 tables */ 1625 if (vmdk_L2update(extent, &m_data, 1626 cluster_offset >> BDRV_SECTOR_BITS) 1627 != VMDK_OK) { 1628 return -EIO; 1629 } 1630 } 1631 } 1632 bytes -= n_bytes; 1633 offset += n_bytes; 1634 bytes_done += n_bytes; 1635 1636 /* update CID on the first write every time the virtual disk is 1637 * opened */ 1638 if (!s->cid_updated) { 1639 ret = vmdk_write_cid(bs, g_random_int()); 1640 if (ret < 0) { 1641 return ret; 1642 } 1643 s->cid_updated = true; 1644 } 1645 } 1646 return 0; 1647 } 1648 1649 static int coroutine_fn 1650 vmdk_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes, 1651 QEMUIOVector *qiov, int flags) 1652 { 1653 int ret; 1654 BDRVVmdkState *s = bs->opaque; 1655 qemu_co_mutex_lock(&s->lock); 1656 ret = vmdk_pwritev(bs, offset, bytes, qiov, false, false); 1657 qemu_co_mutex_unlock(&s->lock); 1658 return ret; 1659 } 1660 1661 static int coroutine_fn 1662 vmdk_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset, 1663 uint64_t bytes, QEMUIOVector *qiov) 1664 { 1665 return vmdk_co_pwritev(bs, offset, bytes, qiov, 0); 1666 } 1667 1668 static int coroutine_fn vmdk_co_pwrite_zeroes(BlockDriverState *bs, 1669 int64_t offset, 1670 int bytes, 1671 BdrvRequestFlags flags) 1672 { 1673 int ret; 1674 BDRVVmdkState *s = bs->opaque; 1675 1676 qemu_co_mutex_lock(&s->lock); 1677 /* write zeroes could fail if sectors not aligned to cluster, test it with 1678 * dry_run == true before really updating image */ 1679 ret = vmdk_pwritev(bs, offset, bytes, NULL, true, true); 1680 if (!ret) { 1681 ret = vmdk_pwritev(bs, offset, bytes, NULL, true, false); 1682 } 1683 qemu_co_mutex_unlock(&s->lock); 1684 return ret; 1685 } 1686 1687 static int vmdk_create_extent(const char *filename, int64_t filesize, 1688 bool flat, bool compress, bool zeroed_grain, 1689 QemuOpts *opts, Error **errp) 1690 { 1691 int ret, i; 1692 BlockBackend *blk = NULL; 1693 VMDK4Header header; 1694 Error *local_err = NULL; 1695 uint32_t tmp, magic, grains, gd_sectors, gt_size, gt_count; 1696 uint32_t *gd_buf = NULL; 1697 int gd_buf_size; 1698 1699 ret = bdrv_create_file(filename, opts, &local_err); 1700 if (ret < 0) { 1701 error_propagate(errp, local_err); 1702 goto exit; 1703 } 1704 1705 blk = blk_new_open(filename, NULL, NULL, 1706 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, 1707 &local_err); 1708 if (blk == NULL) { 1709 error_propagate(errp, local_err); 1710 ret = -EIO; 1711 goto exit; 1712 } 1713 1714 blk_set_allow_write_beyond_eof(blk, true); 1715 1716 if (flat) { 1717 ret = blk_truncate(blk, filesize, errp); 1718 goto exit; 1719 } 1720 magic = cpu_to_be32(VMDK4_MAGIC); 1721 memset(&header, 0, sizeof(header)); 1722 if (compress) { 1723 header.version = 3; 1724 } else if (zeroed_grain) { 1725 header.version = 2; 1726 } else { 1727 header.version = 1; 1728 } 1729 header.flags = VMDK4_FLAG_RGD | VMDK4_FLAG_NL_DETECT 1730 | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0) 1731 | (zeroed_grain ? VMDK4_FLAG_ZERO_GRAIN : 0); 1732 header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0; 1733 header.capacity = filesize / BDRV_SECTOR_SIZE; 1734 header.granularity = 128; 1735 header.num_gtes_per_gt = BDRV_SECTOR_SIZE; 1736 1737 grains = DIV_ROUND_UP(filesize / BDRV_SECTOR_SIZE, header.granularity); 1738 gt_size = DIV_ROUND_UP(header.num_gtes_per_gt * sizeof(uint32_t), 1739 BDRV_SECTOR_SIZE); 1740 gt_count = DIV_ROUND_UP(grains, header.num_gtes_per_gt); 1741 gd_sectors = DIV_ROUND_UP(gt_count * sizeof(uint32_t), BDRV_SECTOR_SIZE); 1742 1743 header.desc_offset = 1; 1744 header.desc_size = 20; 1745 header.rgd_offset = header.desc_offset + header.desc_size; 1746 header.gd_offset = header.rgd_offset + gd_sectors + (gt_size * gt_count); 1747 header.grain_offset = 1748 ROUND_UP(header.gd_offset + gd_sectors + (gt_size * gt_count), 1749 header.granularity); 1750 /* swap endianness for all header fields */ 1751 header.version = cpu_to_le32(header.version); 1752 header.flags = cpu_to_le32(header.flags); 1753 header.capacity = cpu_to_le64(header.capacity); 1754 header.granularity = cpu_to_le64(header.granularity); 1755 header.num_gtes_per_gt = cpu_to_le32(header.num_gtes_per_gt); 1756 header.desc_offset = cpu_to_le64(header.desc_offset); 1757 header.desc_size = cpu_to_le64(header.desc_size); 1758 header.rgd_offset = cpu_to_le64(header.rgd_offset); 1759 header.gd_offset = cpu_to_le64(header.gd_offset); 1760 header.grain_offset = cpu_to_le64(header.grain_offset); 1761 header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm); 1762 1763 header.check_bytes[0] = 0xa; 1764 header.check_bytes[1] = 0x20; 1765 header.check_bytes[2] = 0xd; 1766 header.check_bytes[3] = 0xa; 1767 1768 /* write all the data */ 1769 ret = blk_pwrite(blk, 0, &magic, sizeof(magic), 0); 1770 if (ret < 0) { 1771 error_setg(errp, QERR_IO_ERROR); 1772 goto exit; 1773 } 1774 ret = blk_pwrite(blk, sizeof(magic), &header, sizeof(header), 0); 1775 if (ret < 0) { 1776 error_setg(errp, QERR_IO_ERROR); 1777 goto exit; 1778 } 1779 1780 ret = blk_truncate(blk, le64_to_cpu(header.grain_offset) << 9, errp); 1781 if (ret < 0) { 1782 goto exit; 1783 } 1784 1785 /* write grain directory */ 1786 gd_buf_size = gd_sectors * BDRV_SECTOR_SIZE; 1787 gd_buf = g_malloc0(gd_buf_size); 1788 for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_sectors; 1789 i < gt_count; i++, tmp += gt_size) { 1790 gd_buf[i] = cpu_to_le32(tmp); 1791 } 1792 ret = blk_pwrite(blk, le64_to_cpu(header.rgd_offset) * BDRV_SECTOR_SIZE, 1793 gd_buf, gd_buf_size, 0); 1794 if (ret < 0) { 1795 error_setg(errp, QERR_IO_ERROR); 1796 goto exit; 1797 } 1798 1799 /* write backup grain directory */ 1800 for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_sectors; 1801 i < gt_count; i++, tmp += gt_size) { 1802 gd_buf[i] = cpu_to_le32(tmp); 1803 } 1804 ret = blk_pwrite(blk, le64_to_cpu(header.gd_offset) * BDRV_SECTOR_SIZE, 1805 gd_buf, gd_buf_size, 0); 1806 if (ret < 0) { 1807 error_setg(errp, QERR_IO_ERROR); 1808 goto exit; 1809 } 1810 1811 ret = 0; 1812 exit: 1813 if (blk) { 1814 blk_unref(blk); 1815 } 1816 g_free(gd_buf); 1817 return ret; 1818 } 1819 1820 static int filename_decompose(const char *filename, char *path, char *prefix, 1821 char *postfix, size_t buf_len, Error **errp) 1822 { 1823 const char *p, *q; 1824 1825 if (filename == NULL || !strlen(filename)) { 1826 error_setg(errp, "No filename provided"); 1827 return VMDK_ERROR; 1828 } 1829 p = strrchr(filename, '/'); 1830 if (p == NULL) { 1831 p = strrchr(filename, '\\'); 1832 } 1833 if (p == NULL) { 1834 p = strrchr(filename, ':'); 1835 } 1836 if (p != NULL) { 1837 p++; 1838 if (p - filename >= buf_len) { 1839 return VMDK_ERROR; 1840 } 1841 pstrcpy(path, p - filename + 1, filename); 1842 } else { 1843 p = filename; 1844 path[0] = '\0'; 1845 } 1846 q = strrchr(p, '.'); 1847 if (q == NULL) { 1848 pstrcpy(prefix, buf_len, p); 1849 postfix[0] = '\0'; 1850 } else { 1851 if (q - p >= buf_len) { 1852 return VMDK_ERROR; 1853 } 1854 pstrcpy(prefix, q - p + 1, p); 1855 pstrcpy(postfix, buf_len, q); 1856 } 1857 return VMDK_OK; 1858 } 1859 1860 static int vmdk_create(const char *filename, QemuOpts *opts, Error **errp) 1861 { 1862 int idx = 0; 1863 BlockBackend *new_blk = NULL; 1864 Error *local_err = NULL; 1865 char *desc = NULL; 1866 int64_t total_size = 0, filesize; 1867 char *adapter_type = NULL; 1868 char *backing_file = NULL; 1869 char *hw_version = NULL; 1870 char *fmt = NULL; 1871 int ret = 0; 1872 bool flat, split, compress; 1873 GString *ext_desc_lines; 1874 char *path = g_malloc0(PATH_MAX); 1875 char *prefix = g_malloc0(PATH_MAX); 1876 char *postfix = g_malloc0(PATH_MAX); 1877 char *desc_line = g_malloc0(BUF_SIZE); 1878 char *ext_filename = g_malloc0(PATH_MAX); 1879 char *desc_filename = g_malloc0(PATH_MAX); 1880 const int64_t split_size = 0x80000000; /* VMDK has constant split size */ 1881 const char *desc_extent_line; 1882 char *parent_desc_line = g_malloc0(BUF_SIZE); 1883 uint32_t parent_cid = 0xffffffff; 1884 uint32_t number_heads = 16; 1885 bool zeroed_grain = false; 1886 uint32_t desc_offset = 0, desc_len; 1887 const char desc_template[] = 1888 "# Disk DescriptorFile\n" 1889 "version=1\n" 1890 "CID=%" PRIx32 "\n" 1891 "parentCID=%" PRIx32 "\n" 1892 "createType=\"%s\"\n" 1893 "%s" 1894 "\n" 1895 "# Extent description\n" 1896 "%s" 1897 "\n" 1898 "# The Disk Data Base\n" 1899 "#DDB\n" 1900 "\n" 1901 "ddb.virtualHWVersion = \"%s\"\n" 1902 "ddb.geometry.cylinders = \"%" PRId64 "\"\n" 1903 "ddb.geometry.heads = \"%" PRIu32 "\"\n" 1904 "ddb.geometry.sectors = \"63\"\n" 1905 "ddb.adapterType = \"%s\"\n"; 1906 1907 ext_desc_lines = g_string_new(NULL); 1908 1909 if (filename_decompose(filename, path, prefix, postfix, PATH_MAX, errp)) { 1910 ret = -EINVAL; 1911 goto exit; 1912 } 1913 /* Read out options */ 1914 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 1915 BDRV_SECTOR_SIZE); 1916 adapter_type = qemu_opt_get_del(opts, BLOCK_OPT_ADAPTER_TYPE); 1917 backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE); 1918 hw_version = qemu_opt_get_del(opts, BLOCK_OPT_HWVERSION); 1919 if (qemu_opt_get_bool_del(opts, BLOCK_OPT_COMPAT6, false)) { 1920 if (strcmp(hw_version, "undefined")) { 1921 error_setg(errp, 1922 "compat6 cannot be enabled with hwversion set"); 1923 ret = -EINVAL; 1924 goto exit; 1925 } 1926 g_free(hw_version); 1927 hw_version = g_strdup("6"); 1928 } 1929 if (strcmp(hw_version, "undefined") == 0) { 1930 g_free(hw_version); 1931 hw_version = g_strdup("4"); 1932 } 1933 fmt = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT); 1934 if (qemu_opt_get_bool_del(opts, BLOCK_OPT_ZEROED_GRAIN, false)) { 1935 zeroed_grain = true; 1936 } 1937 1938 if (!adapter_type) { 1939 adapter_type = g_strdup("ide"); 1940 } else if (strcmp(adapter_type, "ide") && 1941 strcmp(adapter_type, "buslogic") && 1942 strcmp(adapter_type, "lsilogic") && 1943 strcmp(adapter_type, "legacyESX")) { 1944 error_setg(errp, "Unknown adapter type: '%s'", adapter_type); 1945 ret = -EINVAL; 1946 goto exit; 1947 } 1948 if (strcmp(adapter_type, "ide") != 0) { 1949 /* that's the number of heads with which vmware operates when 1950 creating, exporting, etc. vmdk files with a non-ide adapter type */ 1951 number_heads = 255; 1952 } 1953 if (!fmt) { 1954 /* Default format to monolithicSparse */ 1955 fmt = g_strdup("monolithicSparse"); 1956 } else if (strcmp(fmt, "monolithicFlat") && 1957 strcmp(fmt, "monolithicSparse") && 1958 strcmp(fmt, "twoGbMaxExtentSparse") && 1959 strcmp(fmt, "twoGbMaxExtentFlat") && 1960 strcmp(fmt, "streamOptimized")) { 1961 error_setg(errp, "Unknown subformat: '%s'", fmt); 1962 ret = -EINVAL; 1963 goto exit; 1964 } 1965 split = !(strcmp(fmt, "twoGbMaxExtentFlat") && 1966 strcmp(fmt, "twoGbMaxExtentSparse")); 1967 flat = !(strcmp(fmt, "monolithicFlat") && 1968 strcmp(fmt, "twoGbMaxExtentFlat")); 1969 compress = !strcmp(fmt, "streamOptimized"); 1970 if (flat) { 1971 desc_extent_line = "RW %" PRId64 " FLAT \"%s\" 0\n"; 1972 } else { 1973 desc_extent_line = "RW %" PRId64 " SPARSE \"%s\"\n"; 1974 } 1975 if (flat && backing_file) { 1976 error_setg(errp, "Flat image can't have backing file"); 1977 ret = -ENOTSUP; 1978 goto exit; 1979 } 1980 if (flat && zeroed_grain) { 1981 error_setg(errp, "Flat image can't enable zeroed grain"); 1982 ret = -ENOTSUP; 1983 goto exit; 1984 } 1985 if (backing_file) { 1986 BlockBackend *blk; 1987 char *full_backing = g_new0(char, PATH_MAX); 1988 bdrv_get_full_backing_filename_from_filename(filename, backing_file, 1989 full_backing, PATH_MAX, 1990 &local_err); 1991 if (local_err) { 1992 g_free(full_backing); 1993 error_propagate(errp, local_err); 1994 ret = -ENOENT; 1995 goto exit; 1996 } 1997 1998 blk = blk_new_open(full_backing, NULL, NULL, 1999 BDRV_O_NO_BACKING, errp); 2000 g_free(full_backing); 2001 if (blk == NULL) { 2002 ret = -EIO; 2003 goto exit; 2004 } 2005 if (strcmp(blk_bs(blk)->drv->format_name, "vmdk")) { 2006 blk_unref(blk); 2007 ret = -EINVAL; 2008 goto exit; 2009 } 2010 parent_cid = vmdk_read_cid(blk_bs(blk), 0); 2011 blk_unref(blk); 2012 snprintf(parent_desc_line, BUF_SIZE, 2013 "parentFileNameHint=\"%s\"", backing_file); 2014 } 2015 2016 /* Create extents */ 2017 filesize = total_size; 2018 while (filesize > 0) { 2019 int64_t size = filesize; 2020 2021 if (split && size > split_size) { 2022 size = split_size; 2023 } 2024 if (split) { 2025 snprintf(desc_filename, PATH_MAX, "%s-%c%03d%s", 2026 prefix, flat ? 'f' : 's', ++idx, postfix); 2027 } else if (flat) { 2028 snprintf(desc_filename, PATH_MAX, "%s-flat%s", prefix, postfix); 2029 } else { 2030 snprintf(desc_filename, PATH_MAX, "%s%s", prefix, postfix); 2031 } 2032 snprintf(ext_filename, PATH_MAX, "%s%s", path, desc_filename); 2033 2034 if (vmdk_create_extent(ext_filename, size, 2035 flat, compress, zeroed_grain, opts, errp)) { 2036 ret = -EINVAL; 2037 goto exit; 2038 } 2039 filesize -= size; 2040 2041 /* Format description line */ 2042 snprintf(desc_line, BUF_SIZE, 2043 desc_extent_line, size / BDRV_SECTOR_SIZE, desc_filename); 2044 g_string_append(ext_desc_lines, desc_line); 2045 } 2046 /* generate descriptor file */ 2047 desc = g_strdup_printf(desc_template, 2048 g_random_int(), 2049 parent_cid, 2050 fmt, 2051 parent_desc_line, 2052 ext_desc_lines->str, 2053 hw_version, 2054 total_size / 2055 (int64_t)(63 * number_heads * BDRV_SECTOR_SIZE), 2056 number_heads, 2057 adapter_type); 2058 desc_len = strlen(desc); 2059 /* the descriptor offset = 0x200 */ 2060 if (!split && !flat) { 2061 desc_offset = 0x200; 2062 } else { 2063 ret = bdrv_create_file(filename, opts, &local_err); 2064 if (ret < 0) { 2065 error_propagate(errp, local_err); 2066 goto exit; 2067 } 2068 } 2069 2070 new_blk = blk_new_open(filename, NULL, NULL, 2071 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, 2072 &local_err); 2073 if (new_blk == NULL) { 2074 error_propagate(errp, local_err); 2075 ret = -EIO; 2076 goto exit; 2077 } 2078 2079 blk_set_allow_write_beyond_eof(new_blk, true); 2080 2081 ret = blk_pwrite(new_blk, desc_offset, desc, desc_len, 0); 2082 if (ret < 0) { 2083 error_setg_errno(errp, -ret, "Could not write description"); 2084 goto exit; 2085 } 2086 /* bdrv_pwrite write padding zeros to align to sector, we don't need that 2087 * for description file */ 2088 if (desc_offset == 0) { 2089 ret = blk_truncate(new_blk, desc_len, errp); 2090 } 2091 exit: 2092 if (new_blk) { 2093 blk_unref(new_blk); 2094 } 2095 g_free(adapter_type); 2096 g_free(backing_file); 2097 g_free(hw_version); 2098 g_free(fmt); 2099 g_free(desc); 2100 g_free(path); 2101 g_free(prefix); 2102 g_free(postfix); 2103 g_free(desc_line); 2104 g_free(ext_filename); 2105 g_free(desc_filename); 2106 g_free(parent_desc_line); 2107 g_string_free(ext_desc_lines, true); 2108 return ret; 2109 } 2110 2111 static void vmdk_close(BlockDriverState *bs) 2112 { 2113 BDRVVmdkState *s = bs->opaque; 2114 2115 vmdk_free_extents(bs); 2116 g_free(s->create_type); 2117 2118 migrate_del_blocker(s->migration_blocker); 2119 error_free(s->migration_blocker); 2120 } 2121 2122 static coroutine_fn int vmdk_co_flush(BlockDriverState *bs) 2123 { 2124 BDRVVmdkState *s = bs->opaque; 2125 int i, err; 2126 int ret = 0; 2127 2128 for (i = 0; i < s->num_extents; i++) { 2129 err = bdrv_co_flush(s->extents[i].file->bs); 2130 if (err < 0) { 2131 ret = err; 2132 } 2133 } 2134 return ret; 2135 } 2136 2137 static int64_t vmdk_get_allocated_file_size(BlockDriverState *bs) 2138 { 2139 int i; 2140 int64_t ret = 0; 2141 int64_t r; 2142 BDRVVmdkState *s = bs->opaque; 2143 2144 ret = bdrv_get_allocated_file_size(bs->file->bs); 2145 if (ret < 0) { 2146 return ret; 2147 } 2148 for (i = 0; i < s->num_extents; i++) { 2149 if (s->extents[i].file == bs->file) { 2150 continue; 2151 } 2152 r = bdrv_get_allocated_file_size(s->extents[i].file->bs); 2153 if (r < 0) { 2154 return r; 2155 } 2156 ret += r; 2157 } 2158 return ret; 2159 } 2160 2161 static int vmdk_has_zero_init(BlockDriverState *bs) 2162 { 2163 int i; 2164 BDRVVmdkState *s = bs->opaque; 2165 2166 /* If has a flat extent and its underlying storage doesn't have zero init, 2167 * return 0. */ 2168 for (i = 0; i < s->num_extents; i++) { 2169 if (s->extents[i].flat) { 2170 if (!bdrv_has_zero_init(s->extents[i].file->bs)) { 2171 return 0; 2172 } 2173 } 2174 } 2175 return 1; 2176 } 2177 2178 static ImageInfo *vmdk_get_extent_info(VmdkExtent *extent) 2179 { 2180 ImageInfo *info = g_new0(ImageInfo, 1); 2181 2182 *info = (ImageInfo){ 2183 .filename = g_strdup(extent->file->bs->filename), 2184 .format = g_strdup(extent->type), 2185 .virtual_size = extent->sectors * BDRV_SECTOR_SIZE, 2186 .compressed = extent->compressed, 2187 .has_compressed = extent->compressed, 2188 .cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE, 2189 .has_cluster_size = !extent->flat, 2190 }; 2191 2192 return info; 2193 } 2194 2195 static int vmdk_check(BlockDriverState *bs, BdrvCheckResult *result, 2196 BdrvCheckMode fix) 2197 { 2198 BDRVVmdkState *s = bs->opaque; 2199 VmdkExtent *extent = NULL; 2200 int64_t sector_num = 0; 2201 int64_t total_sectors = bdrv_nb_sectors(bs); 2202 int ret; 2203 uint64_t cluster_offset; 2204 2205 if (fix) { 2206 return -ENOTSUP; 2207 } 2208 2209 for (;;) { 2210 if (sector_num >= total_sectors) { 2211 return 0; 2212 } 2213 extent = find_extent(s, sector_num, extent); 2214 if (!extent) { 2215 fprintf(stderr, 2216 "ERROR: could not find extent for sector %" PRId64 "\n", 2217 sector_num); 2218 break; 2219 } 2220 ret = get_cluster_offset(bs, extent, NULL, 2221 sector_num << BDRV_SECTOR_BITS, 2222 false, &cluster_offset, 0, 0); 2223 if (ret == VMDK_ERROR) { 2224 fprintf(stderr, 2225 "ERROR: could not get cluster_offset for sector %" 2226 PRId64 "\n", sector_num); 2227 break; 2228 } 2229 if (ret == VMDK_OK && 2230 cluster_offset >= bdrv_getlength(extent->file->bs)) 2231 { 2232 fprintf(stderr, 2233 "ERROR: cluster offset for sector %" 2234 PRId64 " points after EOF\n", sector_num); 2235 break; 2236 } 2237 sector_num += extent->cluster_sectors; 2238 } 2239 2240 result->corruptions++; 2241 return 0; 2242 } 2243 2244 static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs) 2245 { 2246 int i; 2247 BDRVVmdkState *s = bs->opaque; 2248 ImageInfoSpecific *spec_info = g_new0(ImageInfoSpecific, 1); 2249 ImageInfoList **next; 2250 2251 *spec_info = (ImageInfoSpecific){ 2252 .type = IMAGE_INFO_SPECIFIC_KIND_VMDK, 2253 .u = { 2254 .vmdk.data = g_new0(ImageInfoSpecificVmdk, 1), 2255 }, 2256 }; 2257 2258 *spec_info->u.vmdk.data = (ImageInfoSpecificVmdk) { 2259 .create_type = g_strdup(s->create_type), 2260 .cid = s->cid, 2261 .parent_cid = s->parent_cid, 2262 }; 2263 2264 next = &spec_info->u.vmdk.data->extents; 2265 for (i = 0; i < s->num_extents; i++) { 2266 *next = g_new0(ImageInfoList, 1); 2267 (*next)->value = vmdk_get_extent_info(&s->extents[i]); 2268 (*next)->next = NULL; 2269 next = &(*next)->next; 2270 } 2271 2272 return spec_info; 2273 } 2274 2275 static bool vmdk_extents_type_eq(const VmdkExtent *a, const VmdkExtent *b) 2276 { 2277 return a->flat == b->flat && 2278 a->compressed == b->compressed && 2279 (a->flat || a->cluster_sectors == b->cluster_sectors); 2280 } 2281 2282 static int vmdk_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 2283 { 2284 int i; 2285 BDRVVmdkState *s = bs->opaque; 2286 assert(s->num_extents); 2287 2288 /* See if we have multiple extents but they have different cases */ 2289 for (i = 1; i < s->num_extents; i++) { 2290 if (!vmdk_extents_type_eq(&s->extents[0], &s->extents[i])) { 2291 return -ENOTSUP; 2292 } 2293 } 2294 bdi->needs_compressed_writes = s->extents[0].compressed; 2295 if (!s->extents[0].flat) { 2296 bdi->cluster_size = s->extents[0].cluster_sectors << BDRV_SECTOR_BITS; 2297 } 2298 return 0; 2299 } 2300 2301 static QemuOptsList vmdk_create_opts = { 2302 .name = "vmdk-create-opts", 2303 .head = QTAILQ_HEAD_INITIALIZER(vmdk_create_opts.head), 2304 .desc = { 2305 { 2306 .name = BLOCK_OPT_SIZE, 2307 .type = QEMU_OPT_SIZE, 2308 .help = "Virtual disk size" 2309 }, 2310 { 2311 .name = BLOCK_OPT_ADAPTER_TYPE, 2312 .type = QEMU_OPT_STRING, 2313 .help = "Virtual adapter type, can be one of " 2314 "ide (default), lsilogic, buslogic or legacyESX" 2315 }, 2316 { 2317 .name = BLOCK_OPT_BACKING_FILE, 2318 .type = QEMU_OPT_STRING, 2319 .help = "File name of a base image" 2320 }, 2321 { 2322 .name = BLOCK_OPT_COMPAT6, 2323 .type = QEMU_OPT_BOOL, 2324 .help = "VMDK version 6 image", 2325 .def_value_str = "off" 2326 }, 2327 { 2328 .name = BLOCK_OPT_HWVERSION, 2329 .type = QEMU_OPT_STRING, 2330 .help = "VMDK hardware version", 2331 .def_value_str = "undefined" 2332 }, 2333 { 2334 .name = BLOCK_OPT_SUBFMT, 2335 .type = QEMU_OPT_STRING, 2336 .help = 2337 "VMDK flat extent format, can be one of " 2338 "{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} " 2339 }, 2340 { 2341 .name = BLOCK_OPT_ZEROED_GRAIN, 2342 .type = QEMU_OPT_BOOL, 2343 .help = "Enable efficient zero writes " 2344 "using the zeroed-grain GTE feature" 2345 }, 2346 { /* end of list */ } 2347 } 2348 }; 2349 2350 static BlockDriver bdrv_vmdk = { 2351 .format_name = "vmdk", 2352 .instance_size = sizeof(BDRVVmdkState), 2353 .bdrv_probe = vmdk_probe, 2354 .bdrv_open = vmdk_open, 2355 .bdrv_check = vmdk_check, 2356 .bdrv_reopen_prepare = vmdk_reopen_prepare, 2357 .bdrv_child_perm = bdrv_format_default_perms, 2358 .bdrv_co_preadv = vmdk_co_preadv, 2359 .bdrv_co_pwritev = vmdk_co_pwritev, 2360 .bdrv_co_pwritev_compressed = vmdk_co_pwritev_compressed, 2361 .bdrv_co_pwrite_zeroes = vmdk_co_pwrite_zeroes, 2362 .bdrv_close = vmdk_close, 2363 .bdrv_create = vmdk_create, 2364 .bdrv_co_flush_to_disk = vmdk_co_flush, 2365 .bdrv_co_get_block_status = vmdk_co_get_block_status, 2366 .bdrv_get_allocated_file_size = vmdk_get_allocated_file_size, 2367 .bdrv_has_zero_init = vmdk_has_zero_init, 2368 .bdrv_get_specific_info = vmdk_get_specific_info, 2369 .bdrv_refresh_limits = vmdk_refresh_limits, 2370 .bdrv_get_info = vmdk_get_info, 2371 2372 .supports_backing = true, 2373 .create_opts = &vmdk_create_opts, 2374 }; 2375 2376 static void bdrv_vmdk_init(void) 2377 { 2378 bdrv_register(&bdrv_vmdk); 2379 } 2380 2381 block_init(bdrv_vmdk_init); 2382