1 /* 2 * Block driver for Connectix / Microsoft Virtual PC images 3 * 4 * Copyright (c) 2005 Alex Beregszaszi 5 * Copyright (c) 2009 Kevin Wolf <kwolf@suse.de> 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 #include "qemu-common.h" 26 #include "block_int.h" 27 #include "module.h" 28 #include "migration.h" 29 30 /**************************************************************/ 31 32 #define HEADER_SIZE 512 33 34 //#define CACHE 35 36 enum vhd_type { 37 VHD_FIXED = 2, 38 VHD_DYNAMIC = 3, 39 VHD_DIFFERENCING = 4, 40 }; 41 42 // Seconds since Jan 1, 2000 0:00:00 (UTC) 43 #define VHD_TIMESTAMP_BASE 946684800 44 45 // always big-endian 46 struct vhd_footer { 47 char creator[8]; // "conectix" 48 uint32_t features; 49 uint32_t version; 50 51 // Offset of next header structure, 0xFFFFFFFF if none 52 uint64_t data_offset; 53 54 // Seconds since Jan 1, 2000 0:00:00 (UTC) 55 uint32_t timestamp; 56 57 char creator_app[4]; // "vpc " 58 uint16_t major; 59 uint16_t minor; 60 char creator_os[4]; // "Wi2k" 61 62 uint64_t orig_size; 63 uint64_t size; 64 65 uint16_t cyls; 66 uint8_t heads; 67 uint8_t secs_per_cyl; 68 69 uint32_t type; 70 71 // Checksum of the Hard Disk Footer ("one's complement of the sum of all 72 // the bytes in the footer without the checksum field") 73 uint32_t checksum; 74 75 // UUID used to identify a parent hard disk (backing file) 76 uint8_t uuid[16]; 77 78 uint8_t in_saved_state; 79 }; 80 81 struct vhd_dyndisk_header { 82 char magic[8]; // "cxsparse" 83 84 // Offset of next header structure, 0xFFFFFFFF if none 85 uint64_t data_offset; 86 87 // Offset of the Block Allocation Table (BAT) 88 uint64_t table_offset; 89 90 uint32_t version; 91 uint32_t max_table_entries; // 32bit/entry 92 93 // 2 MB by default, must be a power of two 94 uint32_t block_size; 95 96 uint32_t checksum; 97 uint8_t parent_uuid[16]; 98 uint32_t parent_timestamp; 99 uint32_t reserved; 100 101 // Backing file name (in UTF-16) 102 uint8_t parent_name[512]; 103 104 struct { 105 uint32_t platform; 106 uint32_t data_space; 107 uint32_t data_length; 108 uint32_t reserved; 109 uint64_t data_offset; 110 } parent_locator[8]; 111 }; 112 113 typedef struct BDRVVPCState { 114 CoMutex lock; 115 uint8_t footer_buf[HEADER_SIZE]; 116 uint64_t free_data_block_offset; 117 int max_table_entries; 118 uint32_t *pagetable; 119 uint64_t bat_offset; 120 uint64_t last_bitmap_offset; 121 122 uint32_t block_size; 123 uint32_t bitmap_size; 124 125 #ifdef CACHE 126 uint8_t *pageentry_u8; 127 uint32_t *pageentry_u32; 128 uint16_t *pageentry_u16; 129 130 uint64_t last_bitmap; 131 #endif 132 133 Error *migration_blocker; 134 } BDRVVPCState; 135 136 static uint32_t vpc_checksum(uint8_t* buf, size_t size) 137 { 138 uint32_t res = 0; 139 int i; 140 141 for (i = 0; i < size; i++) 142 res += buf[i]; 143 144 return ~res; 145 } 146 147 148 static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename) 149 { 150 if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8)) 151 return 100; 152 return 0; 153 } 154 155 static int vpc_open(BlockDriverState *bs, int flags) 156 { 157 BDRVVPCState *s = bs->opaque; 158 int i; 159 struct vhd_footer* footer; 160 struct vhd_dyndisk_header* dyndisk_header; 161 uint8_t buf[HEADER_SIZE]; 162 uint32_t checksum; 163 int err = -1; 164 int disk_type = VHD_DYNAMIC; 165 166 if (bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE) != HEADER_SIZE) 167 goto fail; 168 169 footer = (struct vhd_footer*) s->footer_buf; 170 if (strncmp(footer->creator, "conectix", 8)) { 171 int64_t offset = bdrv_getlength(bs->file); 172 if (offset < HEADER_SIZE) { 173 goto fail; 174 } 175 /* If a fixed disk, the footer is found only at the end of the file */ 176 if (bdrv_pread(bs->file, offset-HEADER_SIZE, s->footer_buf, HEADER_SIZE) 177 != HEADER_SIZE) { 178 goto fail; 179 } 180 if (strncmp(footer->creator, "conectix", 8)) { 181 goto fail; 182 } 183 disk_type = VHD_FIXED; 184 } 185 186 checksum = be32_to_cpu(footer->checksum); 187 footer->checksum = 0; 188 if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum) 189 fprintf(stderr, "block-vpc: The header checksum of '%s' is " 190 "incorrect.\n", bs->filename); 191 192 // The visible size of a image in Virtual PC depends on the geometry 193 // rather than on the size stored in the footer (the size in the footer 194 // is too large usually) 195 bs->total_sectors = (int64_t) 196 be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl; 197 198 if (bs->total_sectors >= 65535 * 16 * 255) { 199 err = -EFBIG; 200 goto fail; 201 } 202 203 if (disk_type == VHD_DYNAMIC) { 204 if (bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf, 205 HEADER_SIZE) != HEADER_SIZE) { 206 goto fail; 207 } 208 209 dyndisk_header = (struct vhd_dyndisk_header *) buf; 210 211 if (strncmp(dyndisk_header->magic, "cxsparse", 8)) { 212 goto fail; 213 } 214 215 s->block_size = be32_to_cpu(dyndisk_header->block_size); 216 s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511; 217 218 s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries); 219 s->pagetable = g_malloc(s->max_table_entries * 4); 220 221 s->bat_offset = be64_to_cpu(dyndisk_header->table_offset); 222 if (bdrv_pread(bs->file, s->bat_offset, s->pagetable, 223 s->max_table_entries * 4) != s->max_table_entries * 4) { 224 goto fail; 225 } 226 227 s->free_data_block_offset = 228 (s->bat_offset + (s->max_table_entries * 4) + 511) & ~511; 229 230 for (i = 0; i < s->max_table_entries; i++) { 231 be32_to_cpus(&s->pagetable[i]); 232 if (s->pagetable[i] != 0xFFFFFFFF) { 233 int64_t next = (512 * (int64_t) s->pagetable[i]) + 234 s->bitmap_size + s->block_size; 235 236 if (next > s->free_data_block_offset) { 237 s->free_data_block_offset = next; 238 } 239 } 240 } 241 242 s->last_bitmap_offset = (int64_t) -1; 243 244 #ifdef CACHE 245 s->pageentry_u8 = g_malloc(512); 246 s->pageentry_u32 = s->pageentry_u8; 247 s->pageentry_u16 = s->pageentry_u8; 248 s->last_pagetable = -1; 249 #endif 250 } 251 252 qemu_co_mutex_init(&s->lock); 253 254 /* Disable migration when VHD images are used */ 255 error_set(&s->migration_blocker, 256 QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, 257 "vpc", bs->device_name, "live migration"); 258 migrate_add_blocker(s->migration_blocker); 259 260 return 0; 261 fail: 262 return err; 263 } 264 265 /* 266 * Returns the absolute byte offset of the given sector in the image file. 267 * If the sector is not allocated, -1 is returned instead. 268 * 269 * The parameter write must be 1 if the offset will be used for a write 270 * operation (the block bitmaps is updated then), 0 otherwise. 271 */ 272 static inline int64_t get_sector_offset(BlockDriverState *bs, 273 int64_t sector_num, int write) 274 { 275 BDRVVPCState *s = bs->opaque; 276 uint64_t offset = sector_num * 512; 277 uint64_t bitmap_offset, block_offset; 278 uint32_t pagetable_index, pageentry_index; 279 280 pagetable_index = offset / s->block_size; 281 pageentry_index = (offset % s->block_size) / 512; 282 283 if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff) 284 return -1; // not allocated 285 286 bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index]; 287 block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index); 288 289 // We must ensure that we don't write to any sectors which are marked as 290 // unused in the bitmap. We get away with setting all bits in the block 291 // bitmap each time we write to a new block. This might cause Virtual PC to 292 // miss sparse read optimization, but it's not a problem in terms of 293 // correctness. 294 if (write && (s->last_bitmap_offset != bitmap_offset)) { 295 uint8_t bitmap[s->bitmap_size]; 296 297 s->last_bitmap_offset = bitmap_offset; 298 memset(bitmap, 0xff, s->bitmap_size); 299 bdrv_pwrite_sync(bs->file, bitmap_offset, bitmap, s->bitmap_size); 300 } 301 302 // printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n", 303 // sector_num, pagetable_index, pageentry_index, 304 // bitmap_offset, block_offset); 305 306 // disabled by reason 307 #if 0 308 #ifdef CACHE 309 if (bitmap_offset != s->last_bitmap) 310 { 311 lseek(s->fd, bitmap_offset, SEEK_SET); 312 313 s->last_bitmap = bitmap_offset; 314 315 // Scary! Bitmap is stored as big endian 32bit entries, 316 // while we used to look it up byte by byte 317 read(s->fd, s->pageentry_u8, 512); 318 for (i = 0; i < 128; i++) 319 be32_to_cpus(&s->pageentry_u32[i]); 320 } 321 322 if ((s->pageentry_u8[pageentry_index / 8] >> (pageentry_index % 8)) & 1) 323 return -1; 324 #else 325 lseek(s->fd, bitmap_offset + (pageentry_index / 8), SEEK_SET); 326 327 read(s->fd, &bitmap_entry, 1); 328 329 if ((bitmap_entry >> (pageentry_index % 8)) & 1) 330 return -1; // not allocated 331 #endif 332 #endif 333 334 return block_offset; 335 } 336 337 /* 338 * Writes the footer to the end of the image file. This is needed when the 339 * file grows as it overwrites the old footer 340 * 341 * Returns 0 on success and < 0 on error 342 */ 343 static int rewrite_footer(BlockDriverState* bs) 344 { 345 int ret; 346 BDRVVPCState *s = bs->opaque; 347 int64_t offset = s->free_data_block_offset; 348 349 ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE); 350 if (ret < 0) 351 return ret; 352 353 return 0; 354 } 355 356 /* 357 * Allocates a new block. This involves writing a new footer and updating 358 * the Block Allocation Table to use the space at the old end of the image 359 * file (overwriting the old footer) 360 * 361 * Returns the sectors' offset in the image file on success and < 0 on error 362 */ 363 static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num) 364 { 365 BDRVVPCState *s = bs->opaque; 366 int64_t bat_offset; 367 uint32_t index, bat_value; 368 int ret; 369 uint8_t bitmap[s->bitmap_size]; 370 371 // Check if sector_num is valid 372 if ((sector_num < 0) || (sector_num > bs->total_sectors)) 373 return -1; 374 375 // Write entry into in-memory BAT 376 index = (sector_num * 512) / s->block_size; 377 if (s->pagetable[index] != 0xFFFFFFFF) 378 return -1; 379 380 s->pagetable[index] = s->free_data_block_offset / 512; 381 382 // Initialize the block's bitmap 383 memset(bitmap, 0xff, s->bitmap_size); 384 ret = bdrv_pwrite_sync(bs->file, s->free_data_block_offset, bitmap, 385 s->bitmap_size); 386 if (ret < 0) { 387 return ret; 388 } 389 390 // Write new footer (the old one will be overwritten) 391 s->free_data_block_offset += s->block_size + s->bitmap_size; 392 ret = rewrite_footer(bs); 393 if (ret < 0) 394 goto fail; 395 396 // Write BAT entry to disk 397 bat_offset = s->bat_offset + (4 * index); 398 bat_value = be32_to_cpu(s->pagetable[index]); 399 ret = bdrv_pwrite_sync(bs->file, bat_offset, &bat_value, 4); 400 if (ret < 0) 401 goto fail; 402 403 return get_sector_offset(bs, sector_num, 0); 404 405 fail: 406 s->free_data_block_offset -= (s->block_size + s->bitmap_size); 407 return -1; 408 } 409 410 static int vpc_read(BlockDriverState *bs, int64_t sector_num, 411 uint8_t *buf, int nb_sectors) 412 { 413 BDRVVPCState *s = bs->opaque; 414 int ret; 415 int64_t offset; 416 int64_t sectors, sectors_per_block; 417 struct vhd_footer *footer = (struct vhd_footer *) s->footer_buf; 418 419 if (cpu_to_be32(footer->type) == VHD_FIXED) { 420 return bdrv_read(bs->file, sector_num, buf, nb_sectors); 421 } 422 while (nb_sectors > 0) { 423 offset = get_sector_offset(bs, sector_num, 0); 424 425 sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; 426 sectors = sectors_per_block - (sector_num % sectors_per_block); 427 if (sectors > nb_sectors) { 428 sectors = nb_sectors; 429 } 430 431 if (offset == -1) { 432 memset(buf, 0, sectors * BDRV_SECTOR_SIZE); 433 } else { 434 ret = bdrv_pread(bs->file, offset, buf, 435 sectors * BDRV_SECTOR_SIZE); 436 if (ret != sectors * BDRV_SECTOR_SIZE) { 437 return -1; 438 } 439 } 440 441 nb_sectors -= sectors; 442 sector_num += sectors; 443 buf += sectors * BDRV_SECTOR_SIZE; 444 } 445 return 0; 446 } 447 448 static coroutine_fn int vpc_co_read(BlockDriverState *bs, int64_t sector_num, 449 uint8_t *buf, int nb_sectors) 450 { 451 int ret; 452 BDRVVPCState *s = bs->opaque; 453 qemu_co_mutex_lock(&s->lock); 454 ret = vpc_read(bs, sector_num, buf, nb_sectors); 455 qemu_co_mutex_unlock(&s->lock); 456 return ret; 457 } 458 459 static int vpc_write(BlockDriverState *bs, int64_t sector_num, 460 const uint8_t *buf, int nb_sectors) 461 { 462 BDRVVPCState *s = bs->opaque; 463 int64_t offset; 464 int64_t sectors, sectors_per_block; 465 int ret; 466 struct vhd_footer *footer = (struct vhd_footer *) s->footer_buf; 467 468 if (cpu_to_be32(footer->type) == VHD_FIXED) { 469 return bdrv_write(bs->file, sector_num, buf, nb_sectors); 470 } 471 while (nb_sectors > 0) { 472 offset = get_sector_offset(bs, sector_num, 1); 473 474 sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; 475 sectors = sectors_per_block - (sector_num % sectors_per_block); 476 if (sectors > nb_sectors) { 477 sectors = nb_sectors; 478 } 479 480 if (offset == -1) { 481 offset = alloc_block(bs, sector_num); 482 if (offset < 0) 483 return -1; 484 } 485 486 ret = bdrv_pwrite(bs->file, offset, buf, sectors * BDRV_SECTOR_SIZE); 487 if (ret != sectors * BDRV_SECTOR_SIZE) { 488 return -1; 489 } 490 491 nb_sectors -= sectors; 492 sector_num += sectors; 493 buf += sectors * BDRV_SECTOR_SIZE; 494 } 495 496 return 0; 497 } 498 499 static coroutine_fn int vpc_co_write(BlockDriverState *bs, int64_t sector_num, 500 const uint8_t *buf, int nb_sectors) 501 { 502 int ret; 503 BDRVVPCState *s = bs->opaque; 504 qemu_co_mutex_lock(&s->lock); 505 ret = vpc_write(bs, sector_num, buf, nb_sectors); 506 qemu_co_mutex_unlock(&s->lock); 507 return ret; 508 } 509 510 static coroutine_fn int vpc_co_flush(BlockDriverState *bs) 511 { 512 return bdrv_co_flush(bs->file); 513 } 514 515 /* 516 * Calculates the number of cylinders, heads and sectors per cylinder 517 * based on a given number of sectors. This is the algorithm described 518 * in the VHD specification. 519 * 520 * Note that the geometry doesn't always exactly match total_sectors but 521 * may round it down. 522 * 523 * Returns 0 on success, -EFBIG if the size is larger than 127 GB 524 */ 525 static int calculate_geometry(int64_t total_sectors, uint16_t* cyls, 526 uint8_t* heads, uint8_t* secs_per_cyl) 527 { 528 uint32_t cyls_times_heads; 529 530 if (total_sectors > 65535 * 16 * 255) 531 return -EFBIG; 532 533 if (total_sectors > 65535 * 16 * 63) { 534 *secs_per_cyl = 255; 535 *heads = 16; 536 cyls_times_heads = total_sectors / *secs_per_cyl; 537 } else { 538 *secs_per_cyl = 17; 539 cyls_times_heads = total_sectors / *secs_per_cyl; 540 *heads = (cyls_times_heads + 1023) / 1024; 541 542 if (*heads < 4) 543 *heads = 4; 544 545 if (cyls_times_heads >= (*heads * 1024) || *heads > 16) { 546 *secs_per_cyl = 31; 547 *heads = 16; 548 cyls_times_heads = total_sectors / *secs_per_cyl; 549 } 550 551 if (cyls_times_heads >= (*heads * 1024)) { 552 *secs_per_cyl = 63; 553 *heads = 16; 554 cyls_times_heads = total_sectors / *secs_per_cyl; 555 } 556 } 557 558 *cyls = cyls_times_heads / *heads; 559 560 return 0; 561 } 562 563 static int create_dynamic_disk(int fd, uint8_t *buf, int64_t total_sectors) 564 { 565 struct vhd_dyndisk_header* dyndisk_header = 566 (struct vhd_dyndisk_header*) buf; 567 size_t block_size, num_bat_entries; 568 int i; 569 int ret = -EIO; 570 571 // Write the footer (twice: at the beginning and at the end) 572 block_size = 0x200000; 573 num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512); 574 575 if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) { 576 goto fail; 577 } 578 579 if (lseek(fd, 1536 + ((num_bat_entries * 4 + 511) & ~511), SEEK_SET) < 0) { 580 goto fail; 581 } 582 if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) { 583 goto fail; 584 } 585 586 // Write the initial BAT 587 if (lseek(fd, 3 * 512, SEEK_SET) < 0) { 588 goto fail; 589 } 590 591 memset(buf, 0xFF, 512); 592 for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) { 593 if (write(fd, buf, 512) != 512) { 594 goto fail; 595 } 596 } 597 598 // Prepare the Dynamic Disk Header 599 memset(buf, 0, 1024); 600 601 memcpy(dyndisk_header->magic, "cxsparse", 8); 602 603 /* 604 * Note: The spec is actually wrong here for data_offset, it says 605 * 0xFFFFFFFF, but MS tools expect all 64 bits to be set. 606 */ 607 dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFFFFFFFFFFULL); 608 dyndisk_header->table_offset = be64_to_cpu(3 * 512); 609 dyndisk_header->version = be32_to_cpu(0x00010000); 610 dyndisk_header->block_size = be32_to_cpu(block_size); 611 dyndisk_header->max_table_entries = be32_to_cpu(num_bat_entries); 612 613 dyndisk_header->checksum = be32_to_cpu(vpc_checksum(buf, 1024)); 614 615 // Write the header 616 if (lseek(fd, 512, SEEK_SET) < 0) { 617 goto fail; 618 } 619 620 if (write(fd, buf, 1024) != 1024) { 621 goto fail; 622 } 623 ret = 0; 624 625 fail: 626 return ret; 627 } 628 629 static int create_fixed_disk(int fd, uint8_t *buf, int64_t total_size) 630 { 631 int ret = -EIO; 632 633 /* Add footer to total size */ 634 total_size += 512; 635 if (ftruncate(fd, total_size) != 0) { 636 ret = -errno; 637 goto fail; 638 } 639 if (lseek(fd, -512, SEEK_END) < 0) { 640 goto fail; 641 } 642 if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) { 643 goto fail; 644 } 645 646 ret = 0; 647 648 fail: 649 return ret; 650 } 651 652 static int vpc_create(const char *filename, QEMUOptionParameter *options) 653 { 654 uint8_t buf[1024]; 655 struct vhd_footer *footer = (struct vhd_footer *) buf; 656 QEMUOptionParameter *disk_type_param; 657 int fd, i; 658 uint16_t cyls = 0; 659 uint8_t heads = 0; 660 uint8_t secs_per_cyl = 0; 661 int64_t total_sectors; 662 int64_t total_size; 663 int disk_type; 664 int ret = -EIO; 665 666 /* Read out options */ 667 total_size = get_option_parameter(options, BLOCK_OPT_SIZE)->value.n; 668 669 disk_type_param = get_option_parameter(options, BLOCK_OPT_SUBFMT); 670 if (disk_type_param && disk_type_param->value.s) { 671 if (!strcmp(disk_type_param->value.s, "dynamic")) { 672 disk_type = VHD_DYNAMIC; 673 } else if (!strcmp(disk_type_param->value.s, "fixed")) { 674 disk_type = VHD_FIXED; 675 } else { 676 return -EINVAL; 677 } 678 } else { 679 disk_type = VHD_DYNAMIC; 680 } 681 682 /* Create the file */ 683 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644); 684 if (fd < 0) { 685 return -EIO; 686 } 687 688 /* 689 * Calculate matching total_size and geometry. Increase the number of 690 * sectors requested until we get enough (or fail). This ensures that 691 * qemu-img convert doesn't truncate images, but rather rounds up. 692 */ 693 total_sectors = total_size / BDRV_SECTOR_SIZE; 694 for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) { 695 if (calculate_geometry(total_sectors + i, &cyls, &heads, 696 &secs_per_cyl)) 697 { 698 ret = -EFBIG; 699 goto fail; 700 } 701 } 702 703 total_sectors = (int64_t) cyls * heads * secs_per_cyl; 704 705 /* Prepare the Hard Disk Footer */ 706 memset(buf, 0, 1024); 707 708 memcpy(footer->creator, "conectix", 8); 709 /* TODO Check if "qemu" creator_app is ok for VPC */ 710 memcpy(footer->creator_app, "qemu", 4); 711 memcpy(footer->creator_os, "Wi2k", 4); 712 713 footer->features = be32_to_cpu(0x02); 714 footer->version = be32_to_cpu(0x00010000); 715 if (disk_type == VHD_DYNAMIC) { 716 footer->data_offset = be64_to_cpu(HEADER_SIZE); 717 } else { 718 footer->data_offset = be64_to_cpu(0xFFFFFFFFFFFFFFFFULL); 719 } 720 footer->timestamp = be32_to_cpu(time(NULL) - VHD_TIMESTAMP_BASE); 721 722 /* Version of Virtual PC 2007 */ 723 footer->major = be16_to_cpu(0x0005); 724 footer->minor = be16_to_cpu(0x0003); 725 if (disk_type == VHD_DYNAMIC) { 726 footer->orig_size = be64_to_cpu(total_sectors * 512); 727 footer->size = be64_to_cpu(total_sectors * 512); 728 } else { 729 footer->orig_size = be64_to_cpu(total_size); 730 footer->size = be64_to_cpu(total_size); 731 } 732 footer->cyls = be16_to_cpu(cyls); 733 footer->heads = heads; 734 footer->secs_per_cyl = secs_per_cyl; 735 736 footer->type = be32_to_cpu(disk_type); 737 738 /* TODO uuid is missing */ 739 740 footer->checksum = be32_to_cpu(vpc_checksum(buf, HEADER_SIZE)); 741 742 if (disk_type == VHD_DYNAMIC) { 743 ret = create_dynamic_disk(fd, buf, total_sectors); 744 } else { 745 ret = create_fixed_disk(fd, buf, total_size); 746 } 747 748 fail: 749 close(fd); 750 return ret; 751 } 752 753 static void vpc_close(BlockDriverState *bs) 754 { 755 BDRVVPCState *s = bs->opaque; 756 g_free(s->pagetable); 757 #ifdef CACHE 758 g_free(s->pageentry_u8); 759 #endif 760 761 migrate_del_blocker(s->migration_blocker); 762 error_free(s->migration_blocker); 763 } 764 765 static QEMUOptionParameter vpc_create_options[] = { 766 { 767 .name = BLOCK_OPT_SIZE, 768 .type = OPT_SIZE, 769 .help = "Virtual disk size" 770 }, 771 { 772 .name = BLOCK_OPT_SUBFMT, 773 .type = OPT_STRING, 774 .help = 775 "Type of virtual hard disk format. Supported formats are " 776 "{dynamic (default) | fixed} " 777 }, 778 { NULL } 779 }; 780 781 static BlockDriver bdrv_vpc = { 782 .format_name = "vpc", 783 .instance_size = sizeof(BDRVVPCState), 784 785 .bdrv_probe = vpc_probe, 786 .bdrv_open = vpc_open, 787 .bdrv_close = vpc_close, 788 .bdrv_create = vpc_create, 789 790 .bdrv_read = vpc_co_read, 791 .bdrv_write = vpc_co_write, 792 .bdrv_co_flush_to_disk = vpc_co_flush, 793 794 .create_options = vpc_create_options, 795 }; 796 797 static void bdrv_vpc_init(void) 798 { 799 bdrv_register(&bdrv_vpc); 800 } 801 802 block_init(bdrv_vpc_init); 803