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 /* Return -ve errno, or 0 on success and write CID into *pcid. */ 246 static int vmdk_read_cid(BlockDriverState *bs, int parent, uint32_t *pcid) 247 { 248 char *desc; 249 uint32_t cid; 250 const char *p_name, *cid_str; 251 size_t cid_str_size; 252 BDRVVmdkState *s = bs->opaque; 253 int ret; 254 255 desc = g_malloc0(DESC_SIZE); 256 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); 257 if (ret < 0) { 258 goto out; 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 ret = -EINVAL; 273 goto out; 274 } 275 p_name += cid_str_size; 276 if (sscanf(p_name, "%" SCNx32, &cid) != 1) { 277 ret = -EINVAL; 278 goto out; 279 } 280 *pcid = cid; 281 ret = 0; 282 283 out: 284 g_free(desc); 285 return ret; 286 } 287 288 static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) 289 { 290 char *desc, *tmp_desc; 291 char *p_name, *tmp_str; 292 BDRVVmdkState *s = bs->opaque; 293 int ret = 0; 294 295 desc = g_malloc0(DESC_SIZE); 296 tmp_desc = g_malloc0(DESC_SIZE); 297 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); 298 if (ret < 0) { 299 goto out; 300 } 301 302 desc[DESC_SIZE - 1] = '\0'; 303 tmp_str = strstr(desc, "parentCID"); 304 if (tmp_str == NULL) { 305 ret = -EINVAL; 306 goto out; 307 } 308 309 pstrcpy(tmp_desc, DESC_SIZE, tmp_str); 310 p_name = strstr(desc, "CID"); 311 if (p_name != NULL) { 312 p_name += sizeof("CID"); 313 snprintf(p_name, DESC_SIZE - (p_name - desc), "%" PRIx32 "\n", cid); 314 pstrcat(desc, DESC_SIZE, tmp_desc); 315 } 316 317 ret = bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE); 318 319 out: 320 g_free(desc); 321 g_free(tmp_desc); 322 return ret; 323 } 324 325 static int vmdk_is_cid_valid(BlockDriverState *bs) 326 { 327 BDRVVmdkState *s = bs->opaque; 328 uint32_t cur_pcid; 329 330 if (!s->cid_checked && bs->backing) { 331 BlockDriverState *p_bs = bs->backing->bs; 332 333 if (vmdk_read_cid(p_bs, 0, &cur_pcid) != 0) { 334 /* read failure: report as not valid */ 335 return 0; 336 } 337 if (s->parent_cid != cur_pcid) { 338 /* CID not valid */ 339 return 0; 340 } 341 } 342 s->cid_checked = true; 343 /* CID valid */ 344 return 1; 345 } 346 347 /* We have nothing to do for VMDK reopen, stubs just return success */ 348 static int vmdk_reopen_prepare(BDRVReopenState *state, 349 BlockReopenQueue *queue, Error **errp) 350 { 351 assert(state != NULL); 352 assert(state->bs != NULL); 353 return 0; 354 } 355 356 static int vmdk_parent_open(BlockDriverState *bs) 357 { 358 char *p_name; 359 char *desc; 360 BDRVVmdkState *s = bs->opaque; 361 int ret; 362 363 desc = g_malloc0(DESC_SIZE + 1); 364 ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); 365 if (ret < 0) { 366 goto out; 367 } 368 ret = 0; 369 370 p_name = strstr(desc, "parentFileNameHint"); 371 if (p_name != NULL) { 372 char *end_name; 373 374 p_name += sizeof("parentFileNameHint") + 1; 375 end_name = strchr(p_name, '\"'); 376 if (end_name == NULL) { 377 ret = -EINVAL; 378 goto out; 379 } 380 if ((end_name - p_name) > sizeof(bs->backing_file) - 1) { 381 ret = -EINVAL; 382 goto out; 383 } 384 385 pstrcpy(bs->backing_file, end_name - p_name + 1, p_name); 386 } 387 388 out: 389 g_free(desc); 390 return ret; 391 } 392 393 /* Create and append extent to the extent array. Return the added VmdkExtent 394 * address. return NULL if allocation failed. */ 395 static int vmdk_add_extent(BlockDriverState *bs, 396 BdrvChild *file, bool flat, int64_t sectors, 397 int64_t l1_offset, int64_t l1_backup_offset, 398 uint32_t l1_size, 399 int l2_size, uint64_t cluster_sectors, 400 VmdkExtent **new_extent, 401 Error **errp) 402 { 403 VmdkExtent *extent; 404 BDRVVmdkState *s = bs->opaque; 405 int64_t nb_sectors; 406 407 if (cluster_sectors > 0x200000) { 408 /* 0x200000 * 512Bytes = 1GB for one cluster is unrealistic */ 409 error_setg(errp, "Invalid granularity, image may be corrupt"); 410 return -EFBIG; 411 } 412 if (l1_size > 512 * 1024 * 1024) { 413 /* Although with big capacity and small l1_entry_sectors, we can get a 414 * big l1_size, we don't want unbounded value to allocate the table. 415 * Limit it to 512M, which is 16PB for default cluster and L2 table 416 * size */ 417 error_setg(errp, "L1 size too big"); 418 return -EFBIG; 419 } 420 421 nb_sectors = bdrv_nb_sectors(file->bs); 422 if (nb_sectors < 0) { 423 return nb_sectors; 424 } 425 426 s->extents = g_renew(VmdkExtent, s->extents, s->num_extents + 1); 427 extent = &s->extents[s->num_extents]; 428 s->num_extents++; 429 430 memset(extent, 0, sizeof(VmdkExtent)); 431 extent->file = file; 432 extent->flat = flat; 433 extent->sectors = sectors; 434 extent->l1_table_offset = l1_offset; 435 extent->l1_backup_table_offset = l1_backup_offset; 436 extent->l1_size = l1_size; 437 extent->l1_entry_sectors = l2_size * cluster_sectors; 438 extent->l2_size = l2_size; 439 extent->cluster_sectors = flat ? sectors : cluster_sectors; 440 extent->next_cluster_sector = ROUND_UP(nb_sectors, cluster_sectors); 441 442 if (s->num_extents > 1) { 443 extent->end_sector = (*(extent - 1)).end_sector + extent->sectors; 444 } else { 445 extent->end_sector = extent->sectors; 446 } 447 bs->total_sectors = extent->end_sector; 448 if (new_extent) { 449 *new_extent = extent; 450 } 451 return 0; 452 } 453 454 static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent, 455 Error **errp) 456 { 457 int ret; 458 size_t l1_size; 459 int i; 460 461 /* read the L1 table */ 462 l1_size = extent->l1_size * sizeof(uint32_t); 463 extent->l1_table = g_try_malloc(l1_size); 464 if (l1_size && extent->l1_table == NULL) { 465 return -ENOMEM; 466 } 467 468 ret = bdrv_pread(extent->file, 469 extent->l1_table_offset, 470 extent->l1_table, 471 l1_size); 472 if (ret < 0) { 473 error_setg_errno(errp, -ret, 474 "Could not read l1 table from extent '%s'", 475 extent->file->bs->filename); 476 goto fail_l1; 477 } 478 for (i = 0; i < extent->l1_size; i++) { 479 le32_to_cpus(&extent->l1_table[i]); 480 } 481 482 if (extent->l1_backup_table_offset) { 483 extent->l1_backup_table = g_try_malloc(l1_size); 484 if (l1_size && extent->l1_backup_table == NULL) { 485 ret = -ENOMEM; 486 goto fail_l1; 487 } 488 ret = bdrv_pread(extent->file, 489 extent->l1_backup_table_offset, 490 extent->l1_backup_table, 491 l1_size); 492 if (ret < 0) { 493 error_setg_errno(errp, -ret, 494 "Could not read l1 backup table from extent '%s'", 495 extent->file->bs->filename); 496 goto fail_l1b; 497 } 498 for (i = 0; i < extent->l1_size; i++) { 499 le32_to_cpus(&extent->l1_backup_table[i]); 500 } 501 } 502 503 extent->l2_cache = 504 g_new(uint32_t, extent->l2_size * L2_CACHE_SIZE); 505 return 0; 506 fail_l1b: 507 g_free(extent->l1_backup_table); 508 fail_l1: 509 g_free(extent->l1_table); 510 return ret; 511 } 512 513 static int vmdk_open_vmfs_sparse(BlockDriverState *bs, 514 BdrvChild *file, 515 int flags, Error **errp) 516 { 517 int ret; 518 uint32_t magic; 519 VMDK3Header header; 520 VmdkExtent *extent; 521 522 ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); 523 if (ret < 0) { 524 error_setg_errno(errp, -ret, 525 "Could not read header from file '%s'", 526 file->bs->filename); 527 return ret; 528 } 529 ret = vmdk_add_extent(bs, file, false, 530 le32_to_cpu(header.disk_sectors), 531 (int64_t)le32_to_cpu(header.l1dir_offset) << 9, 532 0, 533 le32_to_cpu(header.l1dir_size), 534 4096, 535 le32_to_cpu(header.granularity), 536 &extent, 537 errp); 538 if (ret < 0) { 539 return ret; 540 } 541 ret = vmdk_init_tables(bs, extent, errp); 542 if (ret) { 543 /* free extent allocated by vmdk_add_extent */ 544 vmdk_free_last_extent(bs); 545 } 546 return ret; 547 } 548 549 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf, 550 QDict *options, Error **errp); 551 552 static char *vmdk_read_desc(BdrvChild *file, uint64_t desc_offset, Error **errp) 553 { 554 int64_t size; 555 char *buf; 556 int ret; 557 558 size = bdrv_getlength(file->bs); 559 if (size < 0) { 560 error_setg_errno(errp, -size, "Could not access file"); 561 return NULL; 562 } 563 564 if (size < 4) { 565 /* Both descriptor file and sparse image must be much larger than 4 566 * bytes, also callers of vmdk_read_desc want to compare the first 4 567 * bytes with VMDK4_MAGIC, let's error out if less is read. */ 568 error_setg(errp, "File is too small, not a valid image"); 569 return NULL; 570 } 571 572 size = MIN(size, (1 << 20) - 1); /* avoid unbounded allocation */ 573 buf = g_malloc(size + 1); 574 575 ret = bdrv_pread(file, desc_offset, buf, size); 576 if (ret < 0) { 577 error_setg_errno(errp, -ret, "Could not read from file"); 578 g_free(buf); 579 return NULL; 580 } 581 buf[ret] = 0; 582 583 return buf; 584 } 585 586 static int vmdk_open_vmdk4(BlockDriverState *bs, 587 BdrvChild *file, 588 int flags, QDict *options, Error **errp) 589 { 590 int ret; 591 uint32_t magic; 592 uint32_t l1_size, l1_entry_sectors; 593 VMDK4Header header; 594 VmdkExtent *extent; 595 BDRVVmdkState *s = bs->opaque; 596 int64_t l1_backup_offset = 0; 597 bool compressed; 598 599 ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); 600 if (ret < 0) { 601 error_setg_errno(errp, -ret, 602 "Could not read header from file '%s'", 603 file->bs->filename); 604 return -EINVAL; 605 } 606 if (header.capacity == 0) { 607 uint64_t desc_offset = le64_to_cpu(header.desc_offset); 608 if (desc_offset) { 609 char *buf = vmdk_read_desc(file, desc_offset << 9, errp); 610 if (!buf) { 611 return -EINVAL; 612 } 613 ret = vmdk_open_desc_file(bs, flags, buf, options, errp); 614 g_free(buf); 615 return ret; 616 } 617 } 618 619 if (!s->create_type) { 620 s->create_type = g_strdup("monolithicSparse"); 621 } 622 623 if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) { 624 /* 625 * The footer takes precedence over the header, so read it in. The 626 * footer starts at offset -1024 from the end: One sector for the 627 * footer, and another one for the end-of-stream marker. 628 */ 629 struct { 630 struct { 631 uint64_t val; 632 uint32_t size; 633 uint32_t type; 634 uint8_t pad[512 - 16]; 635 } QEMU_PACKED footer_marker; 636 637 uint32_t magic; 638 VMDK4Header header; 639 uint8_t pad[512 - 4 - sizeof(VMDK4Header)]; 640 641 struct { 642 uint64_t val; 643 uint32_t size; 644 uint32_t type; 645 uint8_t pad[512 - 16]; 646 } QEMU_PACKED eos_marker; 647 } QEMU_PACKED footer; 648 649 ret = bdrv_pread(file, 650 bs->file->bs->total_sectors * 512 - 1536, 651 &footer, sizeof(footer)); 652 if (ret < 0) { 653 error_setg_errno(errp, -ret, "Failed to read footer"); 654 return ret; 655 } 656 657 /* Some sanity checks for the footer */ 658 if (be32_to_cpu(footer.magic) != VMDK4_MAGIC || 659 le32_to_cpu(footer.footer_marker.size) != 0 || 660 le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER || 661 le64_to_cpu(footer.eos_marker.val) != 0 || 662 le32_to_cpu(footer.eos_marker.size) != 0 || 663 le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM) 664 { 665 error_setg(errp, "Invalid footer"); 666 return -EINVAL; 667 } 668 669 header = footer.header; 670 } 671 672 compressed = 673 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; 674 if (le32_to_cpu(header.version) > 3) { 675 error_setg(errp, "Unsupported VMDK version %" PRIu32, 676 le32_to_cpu(header.version)); 677 return -ENOTSUP; 678 } else if (le32_to_cpu(header.version) == 3 && (flags & BDRV_O_RDWR) && 679 !compressed) { 680 /* VMware KB 2064959 explains that version 3 added support for 681 * persistent changed block tracking (CBT), and backup software can 682 * read it as version=1 if it doesn't care about the changed area 683 * information. So we are safe to enable read only. */ 684 error_setg(errp, "VMDK version 3 must be read only"); 685 return -EINVAL; 686 } 687 688 if (le32_to_cpu(header.num_gtes_per_gt) > 512) { 689 error_setg(errp, "L2 table size too big"); 690 return -EINVAL; 691 } 692 693 l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gt) 694 * le64_to_cpu(header.granularity); 695 if (l1_entry_sectors == 0) { 696 error_setg(errp, "L1 entry size is invalid"); 697 return -EINVAL; 698 } 699 l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1) 700 / l1_entry_sectors; 701 if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) { 702 l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9; 703 } 704 if (bdrv_nb_sectors(file->bs) < le64_to_cpu(header.grain_offset)) { 705 error_setg(errp, "File truncated, expecting at least %" PRId64 " bytes", 706 (int64_t)(le64_to_cpu(header.grain_offset) 707 * BDRV_SECTOR_SIZE)); 708 return -EINVAL; 709 } 710 711 ret = vmdk_add_extent(bs, file, false, 712 le64_to_cpu(header.capacity), 713 le64_to_cpu(header.gd_offset) << 9, 714 l1_backup_offset, 715 l1_size, 716 le32_to_cpu(header.num_gtes_per_gt), 717 le64_to_cpu(header.granularity), 718 &extent, 719 errp); 720 if (ret < 0) { 721 return ret; 722 } 723 extent->compressed = 724 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; 725 if (extent->compressed) { 726 g_free(s->create_type); 727 s->create_type = g_strdup("streamOptimized"); 728 } 729 extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER; 730 extent->version = le32_to_cpu(header.version); 731 extent->has_zero_grain = le32_to_cpu(header.flags) & VMDK4_FLAG_ZERO_GRAIN; 732 ret = vmdk_init_tables(bs, extent, errp); 733 if (ret) { 734 /* free extent allocated by vmdk_add_extent */ 735 vmdk_free_last_extent(bs); 736 } 737 return ret; 738 } 739 740 /* find an option value out of descriptor file */ 741 static int vmdk_parse_description(const char *desc, const char *opt_name, 742 char *buf, int buf_size) 743 { 744 char *opt_pos, *opt_end; 745 const char *end = desc + strlen(desc); 746 747 opt_pos = strstr(desc, opt_name); 748 if (!opt_pos) { 749 return VMDK_ERROR; 750 } 751 /* Skip "=\"" following opt_name */ 752 opt_pos += strlen(opt_name) + 2; 753 if (opt_pos >= end) { 754 return VMDK_ERROR; 755 } 756 opt_end = opt_pos; 757 while (opt_end < end && *opt_end != '"') { 758 opt_end++; 759 } 760 if (opt_end == end || buf_size < opt_end - opt_pos + 1) { 761 return VMDK_ERROR; 762 } 763 pstrcpy(buf, opt_end - opt_pos + 1, opt_pos); 764 return VMDK_OK; 765 } 766 767 /* Open an extent file and append to bs array */ 768 static int vmdk_open_sparse(BlockDriverState *bs, BdrvChild *file, int flags, 769 char *buf, QDict *options, Error **errp) 770 { 771 uint32_t magic; 772 773 magic = ldl_be_p(buf); 774 switch (magic) { 775 case VMDK3_MAGIC: 776 return vmdk_open_vmfs_sparse(bs, file, flags, errp); 777 break; 778 case VMDK4_MAGIC: 779 return vmdk_open_vmdk4(bs, file, flags, options, errp); 780 break; 781 default: 782 error_setg(errp, "Image not in VMDK format"); 783 return -EINVAL; 784 break; 785 } 786 } 787 788 static const char *next_line(const char *s) 789 { 790 while (*s) { 791 if (*s == '\n') { 792 return s + 1; 793 } 794 s++; 795 } 796 return s; 797 } 798 799 static int vmdk_parse_extents(const char *desc, BlockDriverState *bs, 800 const char *desc_file_path, QDict *options, 801 Error **errp) 802 { 803 int ret; 804 int matches; 805 char access[11]; 806 char type[11]; 807 char fname[512]; 808 const char *p, *np; 809 int64_t sectors = 0; 810 int64_t flat_offset; 811 char *extent_path; 812 BdrvChild *extent_file; 813 BDRVVmdkState *s = bs->opaque; 814 VmdkExtent *extent; 815 char extent_opt_prefix[32]; 816 Error *local_err = NULL; 817 818 for (p = desc; *p; p = next_line(p)) { 819 /* parse extent line in one of below formats: 820 * 821 * RW [size in sectors] FLAT "file-name.vmdk" OFFSET 822 * RW [size in sectors] SPARSE "file-name.vmdk" 823 * RW [size in sectors] VMFS "file-name.vmdk" 824 * RW [size in sectors] VMFSSPARSE "file-name.vmdk" 825 */ 826 flat_offset = -1; 827 matches = sscanf(p, "%10s %" SCNd64 " %10s \"%511[^\n\r\"]\" %" SCNd64, 828 access, §ors, type, fname, &flat_offset); 829 if (matches < 4 || strcmp(access, "RW")) { 830 continue; 831 } else if (!strcmp(type, "FLAT")) { 832 if (matches != 5 || flat_offset < 0) { 833 goto invalid; 834 } 835 } else if (!strcmp(type, "VMFS")) { 836 if (matches == 4) { 837 flat_offset = 0; 838 } else { 839 goto invalid; 840 } 841 } else if (matches != 4) { 842 goto invalid; 843 } 844 845 if (sectors <= 0 || 846 (strcmp(type, "FLAT") && strcmp(type, "SPARSE") && 847 strcmp(type, "VMFS") && strcmp(type, "VMFSSPARSE")) || 848 (strcmp(access, "RW"))) { 849 continue; 850 } 851 852 if (!path_is_absolute(fname) && !path_has_protocol(fname) && 853 !desc_file_path[0]) 854 { 855 error_setg(errp, "Cannot use relative extent paths with VMDK " 856 "descriptor file '%s'", bs->file->bs->filename); 857 return -EINVAL; 858 } 859 860 extent_path = g_malloc0(PATH_MAX); 861 path_combine(extent_path, PATH_MAX, desc_file_path, fname); 862 863 ret = snprintf(extent_opt_prefix, 32, "extents.%d", s->num_extents); 864 assert(ret < 32); 865 866 extent_file = bdrv_open_child(extent_path, options, extent_opt_prefix, 867 bs, &child_file, false, &local_err); 868 g_free(extent_path); 869 if (local_err) { 870 error_propagate(errp, local_err); 871 return -EINVAL; 872 } 873 874 /* save to extents array */ 875 if (!strcmp(type, "FLAT") || !strcmp(type, "VMFS")) { 876 /* FLAT extent */ 877 878 ret = vmdk_add_extent(bs, extent_file, true, sectors, 879 0, 0, 0, 0, 0, &extent, errp); 880 if (ret < 0) { 881 bdrv_unref_child(bs, extent_file); 882 return ret; 883 } 884 extent->flat_start_offset = flat_offset << 9; 885 } else if (!strcmp(type, "SPARSE") || !strcmp(type, "VMFSSPARSE")) { 886 /* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/ 887 char *buf = vmdk_read_desc(extent_file, 0, errp); 888 if (!buf) { 889 ret = -EINVAL; 890 } else { 891 ret = vmdk_open_sparse(bs, extent_file, bs->open_flags, buf, 892 options, errp); 893 } 894 g_free(buf); 895 if (ret) { 896 bdrv_unref_child(bs, extent_file); 897 return ret; 898 } 899 extent = &s->extents[s->num_extents - 1]; 900 } else { 901 error_setg(errp, "Unsupported extent type '%s'", type); 902 bdrv_unref_child(bs, extent_file); 903 return -ENOTSUP; 904 } 905 extent->type = g_strdup(type); 906 } 907 return 0; 908 909 invalid: 910 np = next_line(p); 911 assert(np != p); 912 if (np[-1] == '\n') { 913 np--; 914 } 915 error_setg(errp, "Invalid extent line: %.*s", (int)(np - p), p); 916 return -EINVAL; 917 } 918 919 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf, 920 QDict *options, Error **errp) 921 { 922 int ret; 923 char ct[128]; 924 BDRVVmdkState *s = bs->opaque; 925 926 if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) { 927 error_setg(errp, "invalid VMDK image descriptor"); 928 ret = -EINVAL; 929 goto exit; 930 } 931 if (strcmp(ct, "monolithicFlat") && 932 strcmp(ct, "vmfs") && 933 strcmp(ct, "vmfsSparse") && 934 strcmp(ct, "twoGbMaxExtentSparse") && 935 strcmp(ct, "twoGbMaxExtentFlat")) { 936 error_setg(errp, "Unsupported image type '%s'", ct); 937 ret = -ENOTSUP; 938 goto exit; 939 } 940 s->create_type = g_strdup(ct); 941 s->desc_offset = 0; 942 ret = vmdk_parse_extents(buf, bs, bs->file->bs->exact_filename, options, 943 errp); 944 exit: 945 return ret; 946 } 947 948 static int vmdk_open(BlockDriverState *bs, QDict *options, int flags, 949 Error **errp) 950 { 951 char *buf; 952 int ret; 953 BDRVVmdkState *s = bs->opaque; 954 uint32_t magic; 955 Error *local_err = NULL; 956 957 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 958 false, errp); 959 if (!bs->file) { 960 return -EINVAL; 961 } 962 963 buf = vmdk_read_desc(bs->file, 0, errp); 964 if (!buf) { 965 return -EINVAL; 966 } 967 968 magic = ldl_be_p(buf); 969 switch (magic) { 970 case VMDK3_MAGIC: 971 case VMDK4_MAGIC: 972 ret = vmdk_open_sparse(bs, bs->file, flags, buf, options, 973 errp); 974 s->desc_offset = 0x200; 975 break; 976 default: 977 ret = vmdk_open_desc_file(bs, flags, buf, options, errp); 978 break; 979 } 980 if (ret) { 981 goto fail; 982 } 983 984 /* try to open parent images, if exist */ 985 ret = vmdk_parent_open(bs); 986 if (ret) { 987 goto fail; 988 } 989 ret = vmdk_read_cid(bs, 0, &s->cid); 990 if (ret) { 991 goto fail; 992 } 993 ret = vmdk_read_cid(bs, 1, &s->parent_cid); 994 if (ret) { 995 goto fail; 996 } 997 qemu_co_mutex_init(&s->lock); 998 999 /* Disable migration when VMDK images are used */ 1000 error_setg(&s->migration_blocker, "The vmdk format used by node '%s' " 1001 "does not support live migration", 1002 bdrv_get_device_or_node_name(bs)); 1003 ret = migrate_add_blocker(s->migration_blocker, &local_err); 1004 if (local_err) { 1005 error_propagate(errp, local_err); 1006 error_free(s->migration_blocker); 1007 goto fail; 1008 } 1009 1010 g_free(buf); 1011 return 0; 1012 1013 fail: 1014 g_free(buf); 1015 g_free(s->create_type); 1016 s->create_type = NULL; 1017 vmdk_free_extents(bs); 1018 return ret; 1019 } 1020 1021 1022 static void vmdk_refresh_limits(BlockDriverState *bs, Error **errp) 1023 { 1024 BDRVVmdkState *s = bs->opaque; 1025 int i; 1026 1027 for (i = 0; i < s->num_extents; i++) { 1028 if (!s->extents[i].flat) { 1029 bs->bl.pwrite_zeroes_alignment = 1030 MAX(bs->bl.pwrite_zeroes_alignment, 1031 s->extents[i].cluster_sectors << BDRV_SECTOR_BITS); 1032 } 1033 } 1034 } 1035 1036 /** 1037 * get_whole_cluster 1038 * 1039 * Copy backing file's cluster that covers @sector_num, otherwise write zero, 1040 * to the cluster at @cluster_sector_num. 1041 * 1042 * If @skip_start_sector < @skip_end_sector, the relative range 1043 * [@skip_start_sector, @skip_end_sector) is not copied or written, and leave 1044 * it for call to write user data in the request. 1045 */ 1046 static int get_whole_cluster(BlockDriverState *bs, 1047 VmdkExtent *extent, 1048 uint64_t cluster_offset, 1049 uint64_t offset, 1050 uint64_t skip_start_bytes, 1051 uint64_t skip_end_bytes) 1052 { 1053 int ret = VMDK_OK; 1054 int64_t cluster_bytes; 1055 uint8_t *whole_grain; 1056 1057 /* For COW, align request sector_num to cluster start */ 1058 cluster_bytes = extent->cluster_sectors << BDRV_SECTOR_BITS; 1059 offset = QEMU_ALIGN_DOWN(offset, cluster_bytes); 1060 whole_grain = qemu_blockalign(bs, cluster_bytes); 1061 1062 if (!bs->backing) { 1063 memset(whole_grain, 0, skip_start_bytes); 1064 memset(whole_grain + skip_end_bytes, 0, cluster_bytes - skip_end_bytes); 1065 } 1066 1067 assert(skip_end_bytes <= cluster_bytes); 1068 /* we will be here if it's first write on non-exist grain(cluster). 1069 * try to read from parent image, if exist */ 1070 if (bs->backing && !vmdk_is_cid_valid(bs)) { 1071 ret = VMDK_ERROR; 1072 goto exit; 1073 } 1074 1075 /* Read backing data before skip range */ 1076 if (skip_start_bytes > 0) { 1077 if (bs->backing) { 1078 ret = bdrv_pread(bs->backing, offset, whole_grain, 1079 skip_start_bytes); 1080 if (ret < 0) { 1081 ret = VMDK_ERROR; 1082 goto exit; 1083 } 1084 } 1085 ret = bdrv_pwrite(extent->file, cluster_offset, whole_grain, 1086 skip_start_bytes); 1087 if (ret < 0) { 1088 ret = VMDK_ERROR; 1089 goto exit; 1090 } 1091 } 1092 /* Read backing data after skip range */ 1093 if (skip_end_bytes < cluster_bytes) { 1094 if (bs->backing) { 1095 ret = bdrv_pread(bs->backing, offset + skip_end_bytes, 1096 whole_grain + skip_end_bytes, 1097 cluster_bytes - skip_end_bytes); 1098 if (ret < 0) { 1099 ret = VMDK_ERROR; 1100 goto exit; 1101 } 1102 } 1103 ret = bdrv_pwrite(extent->file, cluster_offset + skip_end_bytes, 1104 whole_grain + skip_end_bytes, 1105 cluster_bytes - skip_end_bytes); 1106 if (ret < 0) { 1107 ret = VMDK_ERROR; 1108 goto exit; 1109 } 1110 } 1111 1112 ret = VMDK_OK; 1113 exit: 1114 qemu_vfree(whole_grain); 1115 return ret; 1116 } 1117 1118 static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data, 1119 uint32_t offset) 1120 { 1121 offset = cpu_to_le32(offset); 1122 /* update L2 table */ 1123 if (bdrv_pwrite_sync(extent->file, 1124 ((int64_t)m_data->l2_offset * 512) 1125 + (m_data->l2_index * sizeof(offset)), 1126 &offset, sizeof(offset)) < 0) { 1127 return VMDK_ERROR; 1128 } 1129 /* update backup L2 table */ 1130 if (extent->l1_backup_table_offset != 0) { 1131 m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; 1132 if (bdrv_pwrite_sync(extent->file, 1133 ((int64_t)m_data->l2_offset * 512) 1134 + (m_data->l2_index * sizeof(offset)), 1135 &offset, sizeof(offset)) < 0) { 1136 return VMDK_ERROR; 1137 } 1138 } 1139 if (m_data->l2_cache_entry) { 1140 *m_data->l2_cache_entry = offset; 1141 } 1142 1143 return VMDK_OK; 1144 } 1145 1146 /** 1147 * get_cluster_offset 1148 * 1149 * Look up cluster offset in extent file by sector number, and store in 1150 * @cluster_offset. 1151 * 1152 * For flat extents, the start offset as parsed from the description file is 1153 * returned. 1154 * 1155 * For sparse extents, look up in L1, L2 table. If allocate is true, return an 1156 * offset for a new cluster and update L2 cache. If there is a backing file, 1157 * COW is done before returning; otherwise, zeroes are written to the allocated 1158 * cluster. Both COW and zero writing skips the sector range 1159 * [@skip_start_sector, @skip_end_sector) passed in by caller, because caller 1160 * has new data to write there. 1161 * 1162 * Returns: VMDK_OK if cluster exists and mapped in the image. 1163 * VMDK_UNALLOC if cluster is not mapped and @allocate is false. 1164 * VMDK_ERROR if failed. 1165 */ 1166 static int get_cluster_offset(BlockDriverState *bs, 1167 VmdkExtent *extent, 1168 VmdkMetaData *m_data, 1169 uint64_t offset, 1170 bool allocate, 1171 uint64_t *cluster_offset, 1172 uint64_t skip_start_bytes, 1173 uint64_t skip_end_bytes) 1174 { 1175 unsigned int l1_index, l2_offset, l2_index; 1176 int min_index, i, j; 1177 uint32_t min_count, *l2_table; 1178 bool zeroed = false; 1179 int64_t ret; 1180 int64_t cluster_sector; 1181 1182 if (m_data) { 1183 m_data->valid = 0; 1184 } 1185 if (extent->flat) { 1186 *cluster_offset = extent->flat_start_offset; 1187 return VMDK_OK; 1188 } 1189 1190 offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE; 1191 l1_index = (offset >> 9) / extent->l1_entry_sectors; 1192 if (l1_index >= extent->l1_size) { 1193 return VMDK_ERROR; 1194 } 1195 l2_offset = extent->l1_table[l1_index]; 1196 if (!l2_offset) { 1197 return VMDK_UNALLOC; 1198 } 1199 for (i = 0; i < L2_CACHE_SIZE; i++) { 1200 if (l2_offset == extent->l2_cache_offsets[i]) { 1201 /* increment the hit count */ 1202 if (++extent->l2_cache_counts[i] == 0xffffffff) { 1203 for (j = 0; j < L2_CACHE_SIZE; j++) { 1204 extent->l2_cache_counts[j] >>= 1; 1205 } 1206 } 1207 l2_table = extent->l2_cache + (i * extent->l2_size); 1208 goto found; 1209 } 1210 } 1211 /* not found: load a new entry in the least used one */ 1212 min_index = 0; 1213 min_count = 0xffffffff; 1214 for (i = 0; i < L2_CACHE_SIZE; i++) { 1215 if (extent->l2_cache_counts[i] < min_count) { 1216 min_count = extent->l2_cache_counts[i]; 1217 min_index = i; 1218 } 1219 } 1220 l2_table = extent->l2_cache + (min_index * extent->l2_size); 1221 if (bdrv_pread(extent->file, 1222 (int64_t)l2_offset * 512, 1223 l2_table, 1224 extent->l2_size * sizeof(uint32_t) 1225 ) != extent->l2_size * sizeof(uint32_t)) { 1226 return VMDK_ERROR; 1227 } 1228 1229 extent->l2_cache_offsets[min_index] = l2_offset; 1230 extent->l2_cache_counts[min_index] = 1; 1231 found: 1232 l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size; 1233 cluster_sector = le32_to_cpu(l2_table[l2_index]); 1234 1235 if (extent->has_zero_grain && cluster_sector == VMDK_GTE_ZEROED) { 1236 zeroed = true; 1237 } 1238 1239 if (!cluster_sector || zeroed) { 1240 if (!allocate) { 1241 return zeroed ? VMDK_ZEROED : VMDK_UNALLOC; 1242 } 1243 1244 cluster_sector = extent->next_cluster_sector; 1245 extent->next_cluster_sector += extent->cluster_sectors; 1246 1247 /* First of all we write grain itself, to avoid race condition 1248 * that may to corrupt the image. 1249 * This problem may occur because of insufficient space on host disk 1250 * or inappropriate VM shutdown. 1251 */ 1252 ret = get_whole_cluster(bs, extent, cluster_sector * BDRV_SECTOR_SIZE, 1253 offset, skip_start_bytes, skip_end_bytes); 1254 if (ret) { 1255 return ret; 1256 } 1257 if (m_data) { 1258 m_data->valid = 1; 1259 m_data->l1_index = l1_index; 1260 m_data->l2_index = l2_index; 1261 m_data->l2_offset = l2_offset; 1262 m_data->l2_cache_entry = &l2_table[l2_index]; 1263 } 1264 } 1265 *cluster_offset = cluster_sector << BDRV_SECTOR_BITS; 1266 return VMDK_OK; 1267 } 1268 1269 static VmdkExtent *find_extent(BDRVVmdkState *s, 1270 int64_t sector_num, VmdkExtent *start_hint) 1271 { 1272 VmdkExtent *extent = start_hint; 1273 1274 if (!extent) { 1275 extent = &s->extents[0]; 1276 } 1277 while (extent < &s->extents[s->num_extents]) { 1278 if (sector_num < extent->end_sector) { 1279 return extent; 1280 } 1281 extent++; 1282 } 1283 return NULL; 1284 } 1285 1286 static inline uint64_t vmdk_find_offset_in_cluster(VmdkExtent *extent, 1287 int64_t offset) 1288 { 1289 uint64_t extent_begin_offset, extent_relative_offset; 1290 uint64_t cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE; 1291 1292 extent_begin_offset = 1293 (extent->end_sector - extent->sectors) * BDRV_SECTOR_SIZE; 1294 extent_relative_offset = offset - extent_begin_offset; 1295 return extent_relative_offset % cluster_size; 1296 } 1297 1298 static inline uint64_t vmdk_find_index_in_cluster(VmdkExtent *extent, 1299 int64_t sector_num) 1300 { 1301 uint64_t offset; 1302 offset = vmdk_find_offset_in_cluster(extent, sector_num * BDRV_SECTOR_SIZE); 1303 return offset / BDRV_SECTOR_SIZE; 1304 } 1305 1306 static int64_t coroutine_fn vmdk_co_get_block_status(BlockDriverState *bs, 1307 int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) 1308 { 1309 BDRVVmdkState *s = bs->opaque; 1310 int64_t index_in_cluster, n, ret; 1311 uint64_t offset; 1312 VmdkExtent *extent; 1313 1314 extent = find_extent(s, sector_num, NULL); 1315 if (!extent) { 1316 return 0; 1317 } 1318 qemu_co_mutex_lock(&s->lock); 1319 ret = get_cluster_offset(bs, extent, NULL, 1320 sector_num * 512, false, &offset, 1321 0, 0); 1322 qemu_co_mutex_unlock(&s->lock); 1323 1324 index_in_cluster = vmdk_find_index_in_cluster(extent, sector_num); 1325 switch (ret) { 1326 case VMDK_ERROR: 1327 ret = -EIO; 1328 break; 1329 case VMDK_UNALLOC: 1330 ret = 0; 1331 break; 1332 case VMDK_ZEROED: 1333 ret = BDRV_BLOCK_ZERO; 1334 break; 1335 case VMDK_OK: 1336 ret = BDRV_BLOCK_DATA; 1337 if (!extent->compressed) { 1338 ret |= BDRV_BLOCK_OFFSET_VALID; 1339 ret |= (offset + (index_in_cluster << BDRV_SECTOR_BITS)) 1340 & BDRV_BLOCK_OFFSET_MASK; 1341 } 1342 *file = extent->file->bs; 1343 break; 1344 } 1345 1346 n = extent->cluster_sectors - index_in_cluster; 1347 if (n > nb_sectors) { 1348 n = nb_sectors; 1349 } 1350 *pnum = n; 1351 return ret; 1352 } 1353 1354 static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset, 1355 int64_t offset_in_cluster, QEMUIOVector *qiov, 1356 uint64_t qiov_offset, uint64_t n_bytes, 1357 uint64_t offset) 1358 { 1359 int ret; 1360 VmdkGrainMarker *data = NULL; 1361 uLongf buf_len; 1362 QEMUIOVector local_qiov; 1363 struct iovec iov; 1364 int64_t write_offset; 1365 int64_t write_end_sector; 1366 1367 if (extent->compressed) { 1368 void *compressed_data; 1369 1370 if (!extent->has_marker) { 1371 ret = -EINVAL; 1372 goto out; 1373 } 1374 buf_len = (extent->cluster_sectors << 9) * 2; 1375 data = g_malloc(buf_len + sizeof(VmdkGrainMarker)); 1376 1377 compressed_data = g_malloc(n_bytes); 1378 qemu_iovec_to_buf(qiov, qiov_offset, compressed_data, n_bytes); 1379 ret = compress(data->data, &buf_len, compressed_data, n_bytes); 1380 g_free(compressed_data); 1381 1382 if (ret != Z_OK || buf_len == 0) { 1383 ret = -EINVAL; 1384 goto out; 1385 } 1386 1387 data->lba = cpu_to_le64(offset >> BDRV_SECTOR_BITS); 1388 data->size = cpu_to_le32(buf_len); 1389 1390 n_bytes = buf_len + sizeof(VmdkGrainMarker); 1391 iov = (struct iovec) { 1392 .iov_base = data, 1393 .iov_len = n_bytes, 1394 }; 1395 qemu_iovec_init_external(&local_qiov, &iov, 1); 1396 } else { 1397 qemu_iovec_init(&local_qiov, qiov->niov); 1398 qemu_iovec_concat(&local_qiov, qiov, qiov_offset, n_bytes); 1399 } 1400 1401 write_offset = cluster_offset + offset_in_cluster, 1402 ret = bdrv_co_pwritev(extent->file, write_offset, n_bytes, 1403 &local_qiov, 0); 1404 1405 write_end_sector = DIV_ROUND_UP(write_offset + n_bytes, BDRV_SECTOR_SIZE); 1406 1407 if (extent->compressed) { 1408 extent->next_cluster_sector = write_end_sector; 1409 } else { 1410 extent->next_cluster_sector = MAX(extent->next_cluster_sector, 1411 write_end_sector); 1412 } 1413 1414 if (ret < 0) { 1415 goto out; 1416 } 1417 ret = 0; 1418 out: 1419 g_free(data); 1420 if (!extent->compressed) { 1421 qemu_iovec_destroy(&local_qiov); 1422 } 1423 return ret; 1424 } 1425 1426 static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset, 1427 int64_t offset_in_cluster, QEMUIOVector *qiov, 1428 int bytes) 1429 { 1430 int ret; 1431 int cluster_bytes, buf_bytes; 1432 uint8_t *cluster_buf, *compressed_data; 1433 uint8_t *uncomp_buf; 1434 uint32_t data_len; 1435 VmdkGrainMarker *marker; 1436 uLongf buf_len; 1437 1438 1439 if (!extent->compressed) { 1440 ret = bdrv_co_preadv(extent->file, 1441 cluster_offset + offset_in_cluster, bytes, 1442 qiov, 0); 1443 if (ret < 0) { 1444 return ret; 1445 } 1446 return 0; 1447 } 1448 cluster_bytes = extent->cluster_sectors * 512; 1449 /* Read two clusters in case GrainMarker + compressed data > one cluster */ 1450 buf_bytes = cluster_bytes * 2; 1451 cluster_buf = g_malloc(buf_bytes); 1452 uncomp_buf = g_malloc(cluster_bytes); 1453 ret = bdrv_pread(extent->file, 1454 cluster_offset, 1455 cluster_buf, buf_bytes); 1456 if (ret < 0) { 1457 goto out; 1458 } 1459 compressed_data = cluster_buf; 1460 buf_len = cluster_bytes; 1461 data_len = cluster_bytes; 1462 if (extent->has_marker) { 1463 marker = (VmdkGrainMarker *)cluster_buf; 1464 compressed_data = marker->data; 1465 data_len = le32_to_cpu(marker->size); 1466 } 1467 if (!data_len || data_len > buf_bytes) { 1468 ret = -EINVAL; 1469 goto out; 1470 } 1471 ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len); 1472 if (ret != Z_OK) { 1473 ret = -EINVAL; 1474 goto out; 1475 1476 } 1477 if (offset_in_cluster < 0 || 1478 offset_in_cluster + bytes > buf_len) { 1479 ret = -EINVAL; 1480 goto out; 1481 } 1482 qemu_iovec_from_buf(qiov, 0, uncomp_buf + offset_in_cluster, bytes); 1483 ret = 0; 1484 1485 out: 1486 g_free(uncomp_buf); 1487 g_free(cluster_buf); 1488 return ret; 1489 } 1490 1491 static int coroutine_fn 1492 vmdk_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes, 1493 QEMUIOVector *qiov, int flags) 1494 { 1495 BDRVVmdkState *s = bs->opaque; 1496 int ret; 1497 uint64_t n_bytes, offset_in_cluster; 1498 VmdkExtent *extent = NULL; 1499 QEMUIOVector local_qiov; 1500 uint64_t cluster_offset; 1501 uint64_t bytes_done = 0; 1502 1503 qemu_iovec_init(&local_qiov, qiov->niov); 1504 qemu_co_mutex_lock(&s->lock); 1505 1506 while (bytes > 0) { 1507 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent); 1508 if (!extent) { 1509 ret = -EIO; 1510 goto fail; 1511 } 1512 ret = get_cluster_offset(bs, extent, NULL, 1513 offset, false, &cluster_offset, 0, 0); 1514 offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset); 1515 1516 n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE 1517 - offset_in_cluster); 1518 1519 if (ret != VMDK_OK) { 1520 /* if not allocated, try to read from parent image, if exist */ 1521 if (bs->backing && ret != VMDK_ZEROED) { 1522 if (!vmdk_is_cid_valid(bs)) { 1523 ret = -EINVAL; 1524 goto fail; 1525 } 1526 1527 qemu_iovec_reset(&local_qiov); 1528 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); 1529 1530 ret = bdrv_co_preadv(bs->backing, offset, n_bytes, 1531 &local_qiov, 0); 1532 if (ret < 0) { 1533 goto fail; 1534 } 1535 } else { 1536 qemu_iovec_memset(qiov, bytes_done, 0, n_bytes); 1537 } 1538 } else { 1539 qemu_iovec_reset(&local_qiov); 1540 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); 1541 1542 ret = vmdk_read_extent(extent, cluster_offset, offset_in_cluster, 1543 &local_qiov, n_bytes); 1544 if (ret) { 1545 goto fail; 1546 } 1547 } 1548 bytes -= n_bytes; 1549 offset += n_bytes; 1550 bytes_done += n_bytes; 1551 } 1552 1553 ret = 0; 1554 fail: 1555 qemu_co_mutex_unlock(&s->lock); 1556 qemu_iovec_destroy(&local_qiov); 1557 1558 return ret; 1559 } 1560 1561 /** 1562 * vmdk_write: 1563 * @zeroed: buf is ignored (data is zero), use zeroed_grain GTE feature 1564 * if possible, otherwise return -ENOTSUP. 1565 * @zero_dry_run: used for zeroed == true only, don't update L2 table, just try 1566 * with each cluster. By dry run we can find if the zero write 1567 * is possible without modifying image data. 1568 * 1569 * Returns: error code with 0 for success. 1570 */ 1571 static int vmdk_pwritev(BlockDriverState *bs, uint64_t offset, 1572 uint64_t bytes, QEMUIOVector *qiov, 1573 bool zeroed, bool zero_dry_run) 1574 { 1575 BDRVVmdkState *s = bs->opaque; 1576 VmdkExtent *extent = NULL; 1577 int ret; 1578 int64_t offset_in_cluster, n_bytes; 1579 uint64_t cluster_offset; 1580 uint64_t bytes_done = 0; 1581 VmdkMetaData m_data; 1582 1583 if (DIV_ROUND_UP(offset, BDRV_SECTOR_SIZE) > bs->total_sectors) { 1584 error_report("Wrong offset: offset=0x%" PRIx64 1585 " total_sectors=0x%" PRIx64, 1586 offset, bs->total_sectors); 1587 return -EIO; 1588 } 1589 1590 while (bytes > 0) { 1591 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent); 1592 if (!extent) { 1593 return -EIO; 1594 } 1595 offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset); 1596 n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE 1597 - offset_in_cluster); 1598 1599 ret = get_cluster_offset(bs, extent, &m_data, offset, 1600 !(extent->compressed || zeroed), 1601 &cluster_offset, offset_in_cluster, 1602 offset_in_cluster + n_bytes); 1603 if (extent->compressed) { 1604 if (ret == VMDK_OK) { 1605 /* Refuse write to allocated cluster for streamOptimized */ 1606 error_report("Could not write to allocated cluster" 1607 " for streamOptimized"); 1608 return -EIO; 1609 } else { 1610 /* allocate */ 1611 ret = get_cluster_offset(bs, extent, &m_data, offset, 1612 true, &cluster_offset, 0, 0); 1613 } 1614 } 1615 if (ret == VMDK_ERROR) { 1616 return -EINVAL; 1617 } 1618 if (zeroed) { 1619 /* Do zeroed write, buf is ignored */ 1620 if (extent->has_zero_grain && 1621 offset_in_cluster == 0 && 1622 n_bytes >= extent->cluster_sectors * BDRV_SECTOR_SIZE) { 1623 n_bytes = extent->cluster_sectors * BDRV_SECTOR_SIZE; 1624 if (!zero_dry_run) { 1625 /* update L2 tables */ 1626 if (vmdk_L2update(extent, &m_data, VMDK_GTE_ZEROED) 1627 != VMDK_OK) { 1628 return -EIO; 1629 } 1630 } 1631 } else { 1632 return -ENOTSUP; 1633 } 1634 } else { 1635 ret = vmdk_write_extent(extent, cluster_offset, offset_in_cluster, 1636 qiov, bytes_done, n_bytes, offset); 1637 if (ret) { 1638 return ret; 1639 } 1640 if (m_data.valid) { 1641 /* update L2 tables */ 1642 if (vmdk_L2update(extent, &m_data, 1643 cluster_offset >> BDRV_SECTOR_BITS) 1644 != VMDK_OK) { 1645 return -EIO; 1646 } 1647 } 1648 } 1649 bytes -= n_bytes; 1650 offset += n_bytes; 1651 bytes_done += n_bytes; 1652 1653 /* update CID on the first write every time the virtual disk is 1654 * opened */ 1655 if (!s->cid_updated) { 1656 ret = vmdk_write_cid(bs, g_random_int()); 1657 if (ret < 0) { 1658 return ret; 1659 } 1660 s->cid_updated = true; 1661 } 1662 } 1663 return 0; 1664 } 1665 1666 static int coroutine_fn 1667 vmdk_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes, 1668 QEMUIOVector *qiov, int flags) 1669 { 1670 int ret; 1671 BDRVVmdkState *s = bs->opaque; 1672 qemu_co_mutex_lock(&s->lock); 1673 ret = vmdk_pwritev(bs, offset, bytes, qiov, false, false); 1674 qemu_co_mutex_unlock(&s->lock); 1675 return ret; 1676 } 1677 1678 static int coroutine_fn 1679 vmdk_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset, 1680 uint64_t bytes, QEMUIOVector *qiov) 1681 { 1682 return vmdk_co_pwritev(bs, offset, bytes, qiov, 0); 1683 } 1684 1685 static int coroutine_fn vmdk_co_pwrite_zeroes(BlockDriverState *bs, 1686 int64_t offset, 1687 int bytes, 1688 BdrvRequestFlags flags) 1689 { 1690 int ret; 1691 BDRVVmdkState *s = bs->opaque; 1692 1693 qemu_co_mutex_lock(&s->lock); 1694 /* write zeroes could fail if sectors not aligned to cluster, test it with 1695 * dry_run == true before really updating image */ 1696 ret = vmdk_pwritev(bs, offset, bytes, NULL, true, true); 1697 if (!ret) { 1698 ret = vmdk_pwritev(bs, offset, bytes, NULL, true, false); 1699 } 1700 qemu_co_mutex_unlock(&s->lock); 1701 return ret; 1702 } 1703 1704 static int vmdk_create_extent(const char *filename, int64_t filesize, 1705 bool flat, bool compress, bool zeroed_grain, 1706 QemuOpts *opts, Error **errp) 1707 { 1708 int ret, i; 1709 BlockBackend *blk = NULL; 1710 VMDK4Header header; 1711 Error *local_err = NULL; 1712 uint32_t tmp, magic, grains, gd_sectors, gt_size, gt_count; 1713 uint32_t *gd_buf = NULL; 1714 int gd_buf_size; 1715 1716 ret = bdrv_create_file(filename, opts, &local_err); 1717 if (ret < 0) { 1718 error_propagate(errp, local_err); 1719 goto exit; 1720 } 1721 1722 blk = blk_new_open(filename, NULL, NULL, 1723 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, 1724 &local_err); 1725 if (blk == NULL) { 1726 error_propagate(errp, local_err); 1727 ret = -EIO; 1728 goto exit; 1729 } 1730 1731 blk_set_allow_write_beyond_eof(blk, true); 1732 1733 if (flat) { 1734 ret = blk_truncate(blk, filesize, PREALLOC_MODE_OFF, errp); 1735 goto exit; 1736 } 1737 magic = cpu_to_be32(VMDK4_MAGIC); 1738 memset(&header, 0, sizeof(header)); 1739 if (compress) { 1740 header.version = 3; 1741 } else if (zeroed_grain) { 1742 header.version = 2; 1743 } else { 1744 header.version = 1; 1745 } 1746 header.flags = VMDK4_FLAG_RGD | VMDK4_FLAG_NL_DETECT 1747 | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0) 1748 | (zeroed_grain ? VMDK4_FLAG_ZERO_GRAIN : 0); 1749 header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0; 1750 header.capacity = filesize / BDRV_SECTOR_SIZE; 1751 header.granularity = 128; 1752 header.num_gtes_per_gt = BDRV_SECTOR_SIZE; 1753 1754 grains = DIV_ROUND_UP(filesize / BDRV_SECTOR_SIZE, header.granularity); 1755 gt_size = DIV_ROUND_UP(header.num_gtes_per_gt * sizeof(uint32_t), 1756 BDRV_SECTOR_SIZE); 1757 gt_count = DIV_ROUND_UP(grains, header.num_gtes_per_gt); 1758 gd_sectors = DIV_ROUND_UP(gt_count * sizeof(uint32_t), BDRV_SECTOR_SIZE); 1759 1760 header.desc_offset = 1; 1761 header.desc_size = 20; 1762 header.rgd_offset = header.desc_offset + header.desc_size; 1763 header.gd_offset = header.rgd_offset + gd_sectors + (gt_size * gt_count); 1764 header.grain_offset = 1765 ROUND_UP(header.gd_offset + gd_sectors + (gt_size * gt_count), 1766 header.granularity); 1767 /* swap endianness for all header fields */ 1768 header.version = cpu_to_le32(header.version); 1769 header.flags = cpu_to_le32(header.flags); 1770 header.capacity = cpu_to_le64(header.capacity); 1771 header.granularity = cpu_to_le64(header.granularity); 1772 header.num_gtes_per_gt = cpu_to_le32(header.num_gtes_per_gt); 1773 header.desc_offset = cpu_to_le64(header.desc_offset); 1774 header.desc_size = cpu_to_le64(header.desc_size); 1775 header.rgd_offset = cpu_to_le64(header.rgd_offset); 1776 header.gd_offset = cpu_to_le64(header.gd_offset); 1777 header.grain_offset = cpu_to_le64(header.grain_offset); 1778 header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm); 1779 1780 header.check_bytes[0] = 0xa; 1781 header.check_bytes[1] = 0x20; 1782 header.check_bytes[2] = 0xd; 1783 header.check_bytes[3] = 0xa; 1784 1785 /* write all the data */ 1786 ret = blk_pwrite(blk, 0, &magic, sizeof(magic), 0); 1787 if (ret < 0) { 1788 error_setg(errp, QERR_IO_ERROR); 1789 goto exit; 1790 } 1791 ret = blk_pwrite(blk, sizeof(magic), &header, sizeof(header), 0); 1792 if (ret < 0) { 1793 error_setg(errp, QERR_IO_ERROR); 1794 goto exit; 1795 } 1796 1797 ret = blk_truncate(blk, le64_to_cpu(header.grain_offset) << 9, 1798 PREALLOC_MODE_OFF, errp); 1799 if (ret < 0) { 1800 goto exit; 1801 } 1802 1803 /* write grain directory */ 1804 gd_buf_size = gd_sectors * BDRV_SECTOR_SIZE; 1805 gd_buf = g_malloc0(gd_buf_size); 1806 for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_sectors; 1807 i < gt_count; i++, tmp += gt_size) { 1808 gd_buf[i] = cpu_to_le32(tmp); 1809 } 1810 ret = blk_pwrite(blk, le64_to_cpu(header.rgd_offset) * BDRV_SECTOR_SIZE, 1811 gd_buf, gd_buf_size, 0); 1812 if (ret < 0) { 1813 error_setg(errp, QERR_IO_ERROR); 1814 goto exit; 1815 } 1816 1817 /* write backup grain directory */ 1818 for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_sectors; 1819 i < gt_count; i++, tmp += gt_size) { 1820 gd_buf[i] = cpu_to_le32(tmp); 1821 } 1822 ret = blk_pwrite(blk, le64_to_cpu(header.gd_offset) * BDRV_SECTOR_SIZE, 1823 gd_buf, gd_buf_size, 0); 1824 if (ret < 0) { 1825 error_setg(errp, QERR_IO_ERROR); 1826 goto exit; 1827 } 1828 1829 ret = 0; 1830 exit: 1831 if (blk) { 1832 blk_unref(blk); 1833 } 1834 g_free(gd_buf); 1835 return ret; 1836 } 1837 1838 static int filename_decompose(const char *filename, char *path, char *prefix, 1839 char *postfix, size_t buf_len, Error **errp) 1840 { 1841 const char *p, *q; 1842 1843 if (filename == NULL || !strlen(filename)) { 1844 error_setg(errp, "No filename provided"); 1845 return VMDK_ERROR; 1846 } 1847 p = strrchr(filename, '/'); 1848 if (p == NULL) { 1849 p = strrchr(filename, '\\'); 1850 } 1851 if (p == NULL) { 1852 p = strrchr(filename, ':'); 1853 } 1854 if (p != NULL) { 1855 p++; 1856 if (p - filename >= buf_len) { 1857 return VMDK_ERROR; 1858 } 1859 pstrcpy(path, p - filename + 1, filename); 1860 } else { 1861 p = filename; 1862 path[0] = '\0'; 1863 } 1864 q = strrchr(p, '.'); 1865 if (q == NULL) { 1866 pstrcpy(prefix, buf_len, p); 1867 postfix[0] = '\0'; 1868 } else { 1869 if (q - p >= buf_len) { 1870 return VMDK_ERROR; 1871 } 1872 pstrcpy(prefix, q - p + 1, p); 1873 pstrcpy(postfix, buf_len, q); 1874 } 1875 return VMDK_OK; 1876 } 1877 1878 static int vmdk_create(const char *filename, QemuOpts *opts, Error **errp) 1879 { 1880 int idx = 0; 1881 BlockBackend *new_blk = NULL; 1882 Error *local_err = NULL; 1883 char *desc = NULL; 1884 int64_t total_size = 0, filesize; 1885 char *adapter_type = NULL; 1886 char *backing_file = NULL; 1887 char *hw_version = NULL; 1888 char *fmt = NULL; 1889 int ret = 0; 1890 bool flat, split, compress; 1891 GString *ext_desc_lines; 1892 char *path = g_malloc0(PATH_MAX); 1893 char *prefix = g_malloc0(PATH_MAX); 1894 char *postfix = g_malloc0(PATH_MAX); 1895 char *desc_line = g_malloc0(BUF_SIZE); 1896 char *ext_filename = g_malloc0(PATH_MAX); 1897 char *desc_filename = g_malloc0(PATH_MAX); 1898 const int64_t split_size = 0x80000000; /* VMDK has constant split size */ 1899 const char *desc_extent_line; 1900 char *parent_desc_line = g_malloc0(BUF_SIZE); 1901 uint32_t parent_cid = 0xffffffff; 1902 uint32_t number_heads = 16; 1903 bool zeroed_grain = false; 1904 uint32_t desc_offset = 0, desc_len; 1905 const char desc_template[] = 1906 "# Disk DescriptorFile\n" 1907 "version=1\n" 1908 "CID=%" PRIx32 "\n" 1909 "parentCID=%" PRIx32 "\n" 1910 "createType=\"%s\"\n" 1911 "%s" 1912 "\n" 1913 "# Extent description\n" 1914 "%s" 1915 "\n" 1916 "# The Disk Data Base\n" 1917 "#DDB\n" 1918 "\n" 1919 "ddb.virtualHWVersion = \"%s\"\n" 1920 "ddb.geometry.cylinders = \"%" PRId64 "\"\n" 1921 "ddb.geometry.heads = \"%" PRIu32 "\"\n" 1922 "ddb.geometry.sectors = \"63\"\n" 1923 "ddb.adapterType = \"%s\"\n"; 1924 1925 ext_desc_lines = g_string_new(NULL); 1926 1927 if (filename_decompose(filename, path, prefix, postfix, PATH_MAX, errp)) { 1928 ret = -EINVAL; 1929 goto exit; 1930 } 1931 /* Read out options */ 1932 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 1933 BDRV_SECTOR_SIZE); 1934 adapter_type = qemu_opt_get_del(opts, BLOCK_OPT_ADAPTER_TYPE); 1935 backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE); 1936 hw_version = qemu_opt_get_del(opts, BLOCK_OPT_HWVERSION); 1937 if (qemu_opt_get_bool_del(opts, BLOCK_OPT_COMPAT6, false)) { 1938 if (strcmp(hw_version, "undefined")) { 1939 error_setg(errp, 1940 "compat6 cannot be enabled with hwversion set"); 1941 ret = -EINVAL; 1942 goto exit; 1943 } 1944 g_free(hw_version); 1945 hw_version = g_strdup("6"); 1946 } 1947 if (strcmp(hw_version, "undefined") == 0) { 1948 g_free(hw_version); 1949 hw_version = g_strdup("4"); 1950 } 1951 fmt = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT); 1952 if (qemu_opt_get_bool_del(opts, BLOCK_OPT_ZEROED_GRAIN, false)) { 1953 zeroed_grain = true; 1954 } 1955 1956 if (!adapter_type) { 1957 adapter_type = g_strdup("ide"); 1958 } else if (strcmp(adapter_type, "ide") && 1959 strcmp(adapter_type, "buslogic") && 1960 strcmp(adapter_type, "lsilogic") && 1961 strcmp(adapter_type, "legacyESX")) { 1962 error_setg(errp, "Unknown adapter type: '%s'", adapter_type); 1963 ret = -EINVAL; 1964 goto exit; 1965 } 1966 if (strcmp(adapter_type, "ide") != 0) { 1967 /* that's the number of heads with which vmware operates when 1968 creating, exporting, etc. vmdk files with a non-ide adapter type */ 1969 number_heads = 255; 1970 } 1971 if (!fmt) { 1972 /* Default format to monolithicSparse */ 1973 fmt = g_strdup("monolithicSparse"); 1974 } else if (strcmp(fmt, "monolithicFlat") && 1975 strcmp(fmt, "monolithicSparse") && 1976 strcmp(fmt, "twoGbMaxExtentSparse") && 1977 strcmp(fmt, "twoGbMaxExtentFlat") && 1978 strcmp(fmt, "streamOptimized")) { 1979 error_setg(errp, "Unknown subformat: '%s'", fmt); 1980 ret = -EINVAL; 1981 goto exit; 1982 } 1983 split = !(strcmp(fmt, "twoGbMaxExtentFlat") && 1984 strcmp(fmt, "twoGbMaxExtentSparse")); 1985 flat = !(strcmp(fmt, "monolithicFlat") && 1986 strcmp(fmt, "twoGbMaxExtentFlat")); 1987 compress = !strcmp(fmt, "streamOptimized"); 1988 if (flat) { 1989 desc_extent_line = "RW %" PRId64 " FLAT \"%s\" 0\n"; 1990 } else { 1991 desc_extent_line = "RW %" PRId64 " SPARSE \"%s\"\n"; 1992 } 1993 if (flat && backing_file) { 1994 error_setg(errp, "Flat image can't have backing file"); 1995 ret = -ENOTSUP; 1996 goto exit; 1997 } 1998 if (flat && zeroed_grain) { 1999 error_setg(errp, "Flat image can't enable zeroed grain"); 2000 ret = -ENOTSUP; 2001 goto exit; 2002 } 2003 if (backing_file) { 2004 BlockBackend *blk; 2005 char *full_backing = g_new0(char, PATH_MAX); 2006 bdrv_get_full_backing_filename_from_filename(filename, backing_file, 2007 full_backing, PATH_MAX, 2008 &local_err); 2009 if (local_err) { 2010 g_free(full_backing); 2011 error_propagate(errp, local_err); 2012 ret = -ENOENT; 2013 goto exit; 2014 } 2015 2016 blk = blk_new_open(full_backing, NULL, NULL, 2017 BDRV_O_NO_BACKING, errp); 2018 g_free(full_backing); 2019 if (blk == NULL) { 2020 ret = -EIO; 2021 goto exit; 2022 } 2023 if (strcmp(blk_bs(blk)->drv->format_name, "vmdk")) { 2024 blk_unref(blk); 2025 ret = -EINVAL; 2026 goto exit; 2027 } 2028 ret = vmdk_read_cid(blk_bs(blk), 0, &parent_cid); 2029 blk_unref(blk); 2030 if (ret) { 2031 goto exit; 2032 } 2033 snprintf(parent_desc_line, BUF_SIZE, 2034 "parentFileNameHint=\"%s\"", backing_file); 2035 } 2036 2037 /* Create extents */ 2038 filesize = total_size; 2039 while (filesize > 0) { 2040 int64_t size = filesize; 2041 2042 if (split && size > split_size) { 2043 size = split_size; 2044 } 2045 if (split) { 2046 snprintf(desc_filename, PATH_MAX, "%s-%c%03d%s", 2047 prefix, flat ? 'f' : 's', ++idx, postfix); 2048 } else if (flat) { 2049 snprintf(desc_filename, PATH_MAX, "%s-flat%s", prefix, postfix); 2050 } else { 2051 snprintf(desc_filename, PATH_MAX, "%s%s", prefix, postfix); 2052 } 2053 snprintf(ext_filename, PATH_MAX, "%s%s", path, desc_filename); 2054 2055 if (vmdk_create_extent(ext_filename, size, 2056 flat, compress, zeroed_grain, opts, errp)) { 2057 ret = -EINVAL; 2058 goto exit; 2059 } 2060 filesize -= size; 2061 2062 /* Format description line */ 2063 snprintf(desc_line, BUF_SIZE, 2064 desc_extent_line, size / BDRV_SECTOR_SIZE, desc_filename); 2065 g_string_append(ext_desc_lines, desc_line); 2066 } 2067 /* generate descriptor file */ 2068 desc = g_strdup_printf(desc_template, 2069 g_random_int(), 2070 parent_cid, 2071 fmt, 2072 parent_desc_line, 2073 ext_desc_lines->str, 2074 hw_version, 2075 total_size / 2076 (int64_t)(63 * number_heads * BDRV_SECTOR_SIZE), 2077 number_heads, 2078 adapter_type); 2079 desc_len = strlen(desc); 2080 /* the descriptor offset = 0x200 */ 2081 if (!split && !flat) { 2082 desc_offset = 0x200; 2083 } else { 2084 ret = bdrv_create_file(filename, opts, &local_err); 2085 if (ret < 0) { 2086 error_propagate(errp, local_err); 2087 goto exit; 2088 } 2089 } 2090 2091 new_blk = blk_new_open(filename, NULL, NULL, 2092 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, 2093 &local_err); 2094 if (new_blk == NULL) { 2095 error_propagate(errp, local_err); 2096 ret = -EIO; 2097 goto exit; 2098 } 2099 2100 blk_set_allow_write_beyond_eof(new_blk, true); 2101 2102 ret = blk_pwrite(new_blk, desc_offset, desc, desc_len, 0); 2103 if (ret < 0) { 2104 error_setg_errno(errp, -ret, "Could not write description"); 2105 goto exit; 2106 } 2107 /* bdrv_pwrite write padding zeros to align to sector, we don't need that 2108 * for description file */ 2109 if (desc_offset == 0) { 2110 ret = blk_truncate(new_blk, desc_len, PREALLOC_MODE_OFF, errp); 2111 } 2112 exit: 2113 if (new_blk) { 2114 blk_unref(new_blk); 2115 } 2116 g_free(adapter_type); 2117 g_free(backing_file); 2118 g_free(hw_version); 2119 g_free(fmt); 2120 g_free(desc); 2121 g_free(path); 2122 g_free(prefix); 2123 g_free(postfix); 2124 g_free(desc_line); 2125 g_free(ext_filename); 2126 g_free(desc_filename); 2127 g_free(parent_desc_line); 2128 g_string_free(ext_desc_lines, true); 2129 return ret; 2130 } 2131 2132 static void vmdk_close(BlockDriverState *bs) 2133 { 2134 BDRVVmdkState *s = bs->opaque; 2135 2136 vmdk_free_extents(bs); 2137 g_free(s->create_type); 2138 2139 migrate_del_blocker(s->migration_blocker); 2140 error_free(s->migration_blocker); 2141 } 2142 2143 static coroutine_fn int vmdk_co_flush(BlockDriverState *bs) 2144 { 2145 BDRVVmdkState *s = bs->opaque; 2146 int i, err; 2147 int ret = 0; 2148 2149 for (i = 0; i < s->num_extents; i++) { 2150 err = bdrv_co_flush(s->extents[i].file->bs); 2151 if (err < 0) { 2152 ret = err; 2153 } 2154 } 2155 return ret; 2156 } 2157 2158 static int64_t vmdk_get_allocated_file_size(BlockDriverState *bs) 2159 { 2160 int i; 2161 int64_t ret = 0; 2162 int64_t r; 2163 BDRVVmdkState *s = bs->opaque; 2164 2165 ret = bdrv_get_allocated_file_size(bs->file->bs); 2166 if (ret < 0) { 2167 return ret; 2168 } 2169 for (i = 0; i < s->num_extents; i++) { 2170 if (s->extents[i].file == bs->file) { 2171 continue; 2172 } 2173 r = bdrv_get_allocated_file_size(s->extents[i].file->bs); 2174 if (r < 0) { 2175 return r; 2176 } 2177 ret += r; 2178 } 2179 return ret; 2180 } 2181 2182 static int vmdk_has_zero_init(BlockDriverState *bs) 2183 { 2184 int i; 2185 BDRVVmdkState *s = bs->opaque; 2186 2187 /* If has a flat extent and its underlying storage doesn't have zero init, 2188 * return 0. */ 2189 for (i = 0; i < s->num_extents; i++) { 2190 if (s->extents[i].flat) { 2191 if (!bdrv_has_zero_init(s->extents[i].file->bs)) { 2192 return 0; 2193 } 2194 } 2195 } 2196 return 1; 2197 } 2198 2199 static ImageInfo *vmdk_get_extent_info(VmdkExtent *extent) 2200 { 2201 ImageInfo *info = g_new0(ImageInfo, 1); 2202 2203 *info = (ImageInfo){ 2204 .filename = g_strdup(extent->file->bs->filename), 2205 .format = g_strdup(extent->type), 2206 .virtual_size = extent->sectors * BDRV_SECTOR_SIZE, 2207 .compressed = extent->compressed, 2208 .has_compressed = extent->compressed, 2209 .cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE, 2210 .has_cluster_size = !extent->flat, 2211 }; 2212 2213 return info; 2214 } 2215 2216 static int vmdk_check(BlockDriverState *bs, BdrvCheckResult *result, 2217 BdrvCheckMode fix) 2218 { 2219 BDRVVmdkState *s = bs->opaque; 2220 VmdkExtent *extent = NULL; 2221 int64_t sector_num = 0; 2222 int64_t total_sectors = bdrv_nb_sectors(bs); 2223 int ret; 2224 uint64_t cluster_offset; 2225 2226 if (fix) { 2227 return -ENOTSUP; 2228 } 2229 2230 for (;;) { 2231 if (sector_num >= total_sectors) { 2232 return 0; 2233 } 2234 extent = find_extent(s, sector_num, extent); 2235 if (!extent) { 2236 fprintf(stderr, 2237 "ERROR: could not find extent for sector %" PRId64 "\n", 2238 sector_num); 2239 break; 2240 } 2241 ret = get_cluster_offset(bs, extent, NULL, 2242 sector_num << BDRV_SECTOR_BITS, 2243 false, &cluster_offset, 0, 0); 2244 if (ret == VMDK_ERROR) { 2245 fprintf(stderr, 2246 "ERROR: could not get cluster_offset for sector %" 2247 PRId64 "\n", sector_num); 2248 break; 2249 } 2250 if (ret == VMDK_OK && 2251 cluster_offset >= bdrv_getlength(extent->file->bs)) 2252 { 2253 fprintf(stderr, 2254 "ERROR: cluster offset for sector %" 2255 PRId64 " points after EOF\n", sector_num); 2256 break; 2257 } 2258 sector_num += extent->cluster_sectors; 2259 } 2260 2261 result->corruptions++; 2262 return 0; 2263 } 2264 2265 static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs) 2266 { 2267 int i; 2268 BDRVVmdkState *s = bs->opaque; 2269 ImageInfoSpecific *spec_info = g_new0(ImageInfoSpecific, 1); 2270 ImageInfoList **next; 2271 2272 *spec_info = (ImageInfoSpecific){ 2273 .type = IMAGE_INFO_SPECIFIC_KIND_VMDK, 2274 .u = { 2275 .vmdk.data = g_new0(ImageInfoSpecificVmdk, 1), 2276 }, 2277 }; 2278 2279 *spec_info->u.vmdk.data = (ImageInfoSpecificVmdk) { 2280 .create_type = g_strdup(s->create_type), 2281 .cid = s->cid, 2282 .parent_cid = s->parent_cid, 2283 }; 2284 2285 next = &spec_info->u.vmdk.data->extents; 2286 for (i = 0; i < s->num_extents; i++) { 2287 *next = g_new0(ImageInfoList, 1); 2288 (*next)->value = vmdk_get_extent_info(&s->extents[i]); 2289 (*next)->next = NULL; 2290 next = &(*next)->next; 2291 } 2292 2293 return spec_info; 2294 } 2295 2296 static bool vmdk_extents_type_eq(const VmdkExtent *a, const VmdkExtent *b) 2297 { 2298 return a->flat == b->flat && 2299 a->compressed == b->compressed && 2300 (a->flat || a->cluster_sectors == b->cluster_sectors); 2301 } 2302 2303 static int vmdk_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 2304 { 2305 int i; 2306 BDRVVmdkState *s = bs->opaque; 2307 assert(s->num_extents); 2308 2309 /* See if we have multiple extents but they have different cases */ 2310 for (i = 1; i < s->num_extents; i++) { 2311 if (!vmdk_extents_type_eq(&s->extents[0], &s->extents[i])) { 2312 return -ENOTSUP; 2313 } 2314 } 2315 bdi->needs_compressed_writes = s->extents[0].compressed; 2316 if (!s->extents[0].flat) { 2317 bdi->cluster_size = s->extents[0].cluster_sectors << BDRV_SECTOR_BITS; 2318 } 2319 return 0; 2320 } 2321 2322 static QemuOptsList vmdk_create_opts = { 2323 .name = "vmdk-create-opts", 2324 .head = QTAILQ_HEAD_INITIALIZER(vmdk_create_opts.head), 2325 .desc = { 2326 { 2327 .name = BLOCK_OPT_SIZE, 2328 .type = QEMU_OPT_SIZE, 2329 .help = "Virtual disk size" 2330 }, 2331 { 2332 .name = BLOCK_OPT_ADAPTER_TYPE, 2333 .type = QEMU_OPT_STRING, 2334 .help = "Virtual adapter type, can be one of " 2335 "ide (default), lsilogic, buslogic or legacyESX" 2336 }, 2337 { 2338 .name = BLOCK_OPT_BACKING_FILE, 2339 .type = QEMU_OPT_STRING, 2340 .help = "File name of a base image" 2341 }, 2342 { 2343 .name = BLOCK_OPT_COMPAT6, 2344 .type = QEMU_OPT_BOOL, 2345 .help = "VMDK version 6 image", 2346 .def_value_str = "off" 2347 }, 2348 { 2349 .name = BLOCK_OPT_HWVERSION, 2350 .type = QEMU_OPT_STRING, 2351 .help = "VMDK hardware version", 2352 .def_value_str = "undefined" 2353 }, 2354 { 2355 .name = BLOCK_OPT_SUBFMT, 2356 .type = QEMU_OPT_STRING, 2357 .help = 2358 "VMDK flat extent format, can be one of " 2359 "{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} " 2360 }, 2361 { 2362 .name = BLOCK_OPT_ZEROED_GRAIN, 2363 .type = QEMU_OPT_BOOL, 2364 .help = "Enable efficient zero writes " 2365 "using the zeroed-grain GTE feature" 2366 }, 2367 { /* end of list */ } 2368 } 2369 }; 2370 2371 static BlockDriver bdrv_vmdk = { 2372 .format_name = "vmdk", 2373 .instance_size = sizeof(BDRVVmdkState), 2374 .bdrv_probe = vmdk_probe, 2375 .bdrv_open = vmdk_open, 2376 .bdrv_check = vmdk_check, 2377 .bdrv_reopen_prepare = vmdk_reopen_prepare, 2378 .bdrv_child_perm = bdrv_format_default_perms, 2379 .bdrv_co_preadv = vmdk_co_preadv, 2380 .bdrv_co_pwritev = vmdk_co_pwritev, 2381 .bdrv_co_pwritev_compressed = vmdk_co_pwritev_compressed, 2382 .bdrv_co_pwrite_zeroes = vmdk_co_pwrite_zeroes, 2383 .bdrv_close = vmdk_close, 2384 .bdrv_create = vmdk_create, 2385 .bdrv_co_flush_to_disk = vmdk_co_flush, 2386 .bdrv_co_get_block_status = vmdk_co_get_block_status, 2387 .bdrv_get_allocated_file_size = vmdk_get_allocated_file_size, 2388 .bdrv_has_zero_init = vmdk_has_zero_init, 2389 .bdrv_get_specific_info = vmdk_get_specific_info, 2390 .bdrv_refresh_limits = vmdk_refresh_limits, 2391 .bdrv_get_info = vmdk_get_info, 2392 2393 .supports_backing = true, 2394 .create_opts = &vmdk_create_opts, 2395 }; 2396 2397 static void bdrv_vmdk_init(void) 2398 { 2399 bdrv_register(&bdrv_vmdk); 2400 } 2401 2402 block_init(bdrv_vmdk_init); 2403