1 /* 2 * Block driver for the VMDK format 3 * 4 * Copyright (c) 2004 Fabrice Bellard 5 * Copyright (c) 2005 Filip Navara 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "qemu-common.h" 27 #include "block_int.h" 28 #include "module.h" 29 30 #define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D') 31 #define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V') 32 33 typedef struct { 34 uint32_t version; 35 uint32_t flags; 36 uint32_t disk_sectors; 37 uint32_t granularity; 38 uint32_t l1dir_offset; 39 uint32_t l1dir_size; 40 uint32_t file_sectors; 41 uint32_t cylinders; 42 uint32_t heads; 43 uint32_t sectors_per_track; 44 } VMDK3Header; 45 46 typedef struct { 47 uint32_t version; 48 uint32_t flags; 49 int64_t capacity; 50 int64_t granularity; 51 int64_t desc_offset; 52 int64_t desc_size; 53 int32_t num_gtes_per_gte; 54 int64_t rgd_offset; 55 int64_t gd_offset; 56 int64_t grain_offset; 57 char filler[1]; 58 char check_bytes[4]; 59 } __attribute__((packed)) VMDK4Header; 60 61 #define L2_CACHE_SIZE 16 62 63 typedef struct BDRVVmdkState { 64 BlockDriverState *hd; 65 int64_t l1_table_offset; 66 int64_t l1_backup_table_offset; 67 uint32_t *l1_table; 68 uint32_t *l1_backup_table; 69 unsigned int l1_size; 70 uint32_t l1_entry_sectors; 71 72 unsigned int l2_size; 73 uint32_t *l2_cache; 74 uint32_t l2_cache_offsets[L2_CACHE_SIZE]; 75 uint32_t l2_cache_counts[L2_CACHE_SIZE]; 76 77 unsigned int cluster_sectors; 78 uint32_t parent_cid; 79 int is_parent; 80 } BDRVVmdkState; 81 82 typedef struct VmdkMetaData { 83 uint32_t offset; 84 unsigned int l1_index; 85 unsigned int l2_index; 86 unsigned int l2_offset; 87 int valid; 88 } VmdkMetaData; 89 90 typedef struct ActiveBDRVState{ 91 BlockDriverState *hd; // active image handler 92 uint64_t cluster_offset; // current write offset 93 }ActiveBDRVState; 94 95 static ActiveBDRVState activeBDRV; 96 97 98 static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename) 99 { 100 uint32_t magic; 101 102 if (buf_size < 4) 103 return 0; 104 magic = be32_to_cpu(*(uint32_t *)buf); 105 if (magic == VMDK3_MAGIC || 106 magic == VMDK4_MAGIC) 107 return 100; 108 else 109 return 0; 110 } 111 112 #define CHECK_CID 1 113 114 #define SECTOR_SIZE 512 115 #define DESC_SIZE 20*SECTOR_SIZE // 20 sectors of 512 bytes each 116 #define HEADER_SIZE 512 // first sector of 512 bytes 117 118 static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) 119 { 120 BDRVVmdkState *s = bs->opaque; 121 char desc[DESC_SIZE]; 122 uint32_t cid; 123 const char *p_name, *cid_str; 124 size_t cid_str_size; 125 126 /* the descriptor offset = 0x200 */ 127 if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) 128 return 0; 129 130 if (parent) { 131 cid_str = "parentCID"; 132 cid_str_size = sizeof("parentCID"); 133 } else { 134 cid_str = "CID"; 135 cid_str_size = sizeof("CID"); 136 } 137 138 if ((p_name = strstr(desc,cid_str)) != NULL) { 139 p_name += cid_str_size; 140 sscanf(p_name,"%x",&cid); 141 } 142 143 return cid; 144 } 145 146 static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) 147 { 148 BDRVVmdkState *s = bs->opaque; 149 char desc[DESC_SIZE], tmp_desc[DESC_SIZE]; 150 char *p_name, *tmp_str; 151 152 /* the descriptor offset = 0x200 */ 153 if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) 154 return -1; 155 156 tmp_str = strstr(desc,"parentCID"); 157 pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str); 158 if ((p_name = strstr(desc,"CID")) != NULL) { 159 p_name += sizeof("CID"); 160 snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); 161 pstrcat(desc, sizeof(desc), tmp_desc); 162 } 163 164 if (bdrv_pwrite(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) 165 return -1; 166 return 0; 167 } 168 169 static int vmdk_is_cid_valid(BlockDriverState *bs) 170 { 171 #ifdef CHECK_CID 172 BDRVVmdkState *s = bs->opaque; 173 BlockDriverState *p_bs = s->hd->backing_hd; 174 uint32_t cur_pcid; 175 176 if (p_bs) { 177 cur_pcid = vmdk_read_cid(p_bs,0); 178 if (s->parent_cid != cur_pcid) 179 // CID not valid 180 return 0; 181 } 182 #endif 183 // CID valid 184 return 1; 185 } 186 187 static int vmdk_snapshot_create(const char *filename, const char *backing_file) 188 { 189 int snp_fd, p_fd; 190 uint32_t p_cid; 191 char *p_name, *gd_buf, *rgd_buf; 192 const char *real_filename, *temp_str; 193 VMDK4Header header; 194 uint32_t gde_entries, gd_size; 195 int64_t gd_offset, rgd_offset, capacity, gt_size; 196 char p_desc[DESC_SIZE], s_desc[DESC_SIZE], hdr[HEADER_SIZE]; 197 static const char desc_template[] = 198 "# Disk DescriptorFile\n" 199 "version=1\n" 200 "CID=%x\n" 201 "parentCID=%x\n" 202 "createType=\"monolithicSparse\"\n" 203 "parentFileNameHint=\"%s\"\n" 204 "\n" 205 "# Extent description\n" 206 "RW %u SPARSE \"%s\"\n" 207 "\n" 208 "# The Disk Data Base \n" 209 "#DDB\n" 210 "\n"; 211 212 snp_fd = open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 0644); 213 if (snp_fd < 0) 214 return -1; 215 p_fd = open(backing_file, O_RDONLY | O_BINARY | O_LARGEFILE); 216 if (p_fd < 0) { 217 close(snp_fd); 218 return -1; 219 } 220 221 /* read the header */ 222 if (lseek(p_fd, 0x0, SEEK_SET) == -1) 223 goto fail; 224 if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE) 225 goto fail; 226 227 /* write the header */ 228 if (lseek(snp_fd, 0x0, SEEK_SET) == -1) 229 goto fail; 230 if (write(snp_fd, hdr, HEADER_SIZE) == -1) 231 goto fail; 232 233 memset(&header, 0, sizeof(header)); 234 memcpy(&header,&hdr[4], sizeof(header)); // skip the VMDK4_MAGIC 235 236 ftruncate(snp_fd, header.grain_offset << 9); 237 /* the descriptor offset = 0x200 */ 238 if (lseek(p_fd, 0x200, SEEK_SET) == -1) 239 goto fail; 240 if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE) 241 goto fail; 242 243 if ((p_name = strstr(p_desc,"CID")) != NULL) { 244 p_name += sizeof("CID"); 245 sscanf(p_name,"%x",&p_cid); 246 } 247 248 real_filename = filename; 249 if ((temp_str = strrchr(real_filename, '\\')) != NULL) 250 real_filename = temp_str + 1; 251 if ((temp_str = strrchr(real_filename, '/')) != NULL) 252 real_filename = temp_str + 1; 253 if ((temp_str = strrchr(real_filename, ':')) != NULL) 254 real_filename = temp_str + 1; 255 256 snprintf(s_desc, sizeof(s_desc), desc_template, p_cid, p_cid, backing_file, 257 (uint32_t)header.capacity, real_filename); 258 259 /* write the descriptor */ 260 if (lseek(snp_fd, 0x200, SEEK_SET) == -1) 261 goto fail; 262 if (write(snp_fd, s_desc, strlen(s_desc)) == -1) 263 goto fail; 264 265 gd_offset = header.gd_offset * SECTOR_SIZE; // offset of GD table 266 rgd_offset = header.rgd_offset * SECTOR_SIZE; // offset of RGD table 267 capacity = header.capacity * SECTOR_SIZE; // Extent size 268 /* 269 * Each GDE span 32M disk, means: 270 * 512 GTE per GT, each GTE points to grain 271 */ 272 gt_size = (int64_t)header.num_gtes_per_gte * header.granularity * SECTOR_SIZE; 273 if (!gt_size) 274 goto fail; 275 gde_entries = (uint32_t)(capacity / gt_size); // number of gde/rgde 276 gd_size = gde_entries * sizeof(uint32_t); 277 278 /* write RGD */ 279 rgd_buf = qemu_malloc(gd_size); 280 if (lseek(p_fd, rgd_offset, SEEK_SET) == -1) 281 goto fail_rgd; 282 if (read(p_fd, rgd_buf, gd_size) != gd_size) 283 goto fail_rgd; 284 if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1) 285 goto fail_rgd; 286 if (write(snp_fd, rgd_buf, gd_size) == -1) 287 goto fail_rgd; 288 qemu_free(rgd_buf); 289 290 /* write GD */ 291 gd_buf = qemu_malloc(gd_size); 292 if (lseek(p_fd, gd_offset, SEEK_SET) == -1) 293 goto fail_gd; 294 if (read(p_fd, gd_buf, gd_size) != gd_size) 295 goto fail_gd; 296 if (lseek(snp_fd, gd_offset, SEEK_SET) == -1) 297 goto fail_gd; 298 if (write(snp_fd, gd_buf, gd_size) == -1) 299 goto fail_gd; 300 qemu_free(gd_buf); 301 302 close(p_fd); 303 close(snp_fd); 304 return 0; 305 306 fail_gd: 307 qemu_free(gd_buf); 308 fail_rgd: 309 qemu_free(rgd_buf); 310 fail: 311 close(p_fd); 312 close(snp_fd); 313 return -1; 314 } 315 316 static void vmdk_parent_close(BlockDriverState *bs) 317 { 318 if (bs->backing_hd) 319 bdrv_close(bs->backing_hd); 320 } 321 322 static int parent_open = 0; 323 static int vmdk_parent_open(BlockDriverState *bs, const char * filename) 324 { 325 BDRVVmdkState *s = bs->opaque; 326 char *p_name; 327 char desc[DESC_SIZE]; 328 char parent_img_name[1024]; 329 330 /* the descriptor offset = 0x200 */ 331 if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) 332 return -1; 333 334 if ((p_name = strstr(desc,"parentFileNameHint")) != NULL) { 335 char *end_name; 336 struct stat file_buf; 337 338 p_name += sizeof("parentFileNameHint") + 1; 339 if ((end_name = strchr(p_name,'\"')) == NULL) 340 return -1; 341 if ((end_name - p_name) > sizeof (s->hd->backing_file) - 1) 342 return -1; 343 344 pstrcpy(s->hd->backing_file, end_name - p_name + 1, p_name); 345 if (stat(s->hd->backing_file, &file_buf) != 0) { 346 path_combine(parent_img_name, sizeof(parent_img_name), 347 filename, s->hd->backing_file); 348 } else { 349 pstrcpy(parent_img_name, sizeof(parent_img_name), 350 s->hd->backing_file); 351 } 352 353 s->hd->backing_hd = bdrv_new(""); 354 if (!s->hd->backing_hd) { 355 failure: 356 bdrv_close(s->hd); 357 return -1; 358 } 359 parent_open = 1; 360 if (bdrv_open(s->hd->backing_hd, parent_img_name, BDRV_O_RDONLY) < 0) 361 goto failure; 362 parent_open = 0; 363 } 364 365 return 0; 366 } 367 368 static int vmdk_open(BlockDriverState *bs, const char *filename, int flags) 369 { 370 BDRVVmdkState *s = bs->opaque; 371 uint32_t magic; 372 int l1_size, i, ret; 373 374 if (parent_open) 375 // Parent must be opened as RO. 376 flags = BDRV_O_RDONLY; 377 378 ret = bdrv_file_open(&s->hd, filename, flags); 379 if (ret < 0) 380 return ret; 381 if (bdrv_pread(s->hd, 0, &magic, sizeof(magic)) != sizeof(magic)) 382 goto fail; 383 384 magic = be32_to_cpu(magic); 385 if (magic == VMDK3_MAGIC) { 386 VMDK3Header header; 387 388 if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header)) 389 goto fail; 390 s->cluster_sectors = le32_to_cpu(header.granularity); 391 s->l2_size = 1 << 9; 392 s->l1_size = 1 << 6; 393 bs->total_sectors = le32_to_cpu(header.disk_sectors); 394 s->l1_table_offset = le32_to_cpu(header.l1dir_offset) << 9; 395 s->l1_backup_table_offset = 0; 396 s->l1_entry_sectors = s->l2_size * s->cluster_sectors; 397 } else if (magic == VMDK4_MAGIC) { 398 VMDK4Header header; 399 400 if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header)) 401 goto fail; 402 bs->total_sectors = le64_to_cpu(header.capacity); 403 s->cluster_sectors = le64_to_cpu(header.granularity); 404 s->l2_size = le32_to_cpu(header.num_gtes_per_gte); 405 s->l1_entry_sectors = s->l2_size * s->cluster_sectors; 406 if (s->l1_entry_sectors <= 0) 407 goto fail; 408 s->l1_size = (bs->total_sectors + s->l1_entry_sectors - 1) 409 / s->l1_entry_sectors; 410 s->l1_table_offset = le64_to_cpu(header.rgd_offset) << 9; 411 s->l1_backup_table_offset = le64_to_cpu(header.gd_offset) << 9; 412 413 if (parent_open) 414 s->is_parent = 1; 415 else 416 s->is_parent = 0; 417 418 // try to open parent images, if exist 419 if (vmdk_parent_open(bs, filename) != 0) 420 goto fail; 421 // write the CID once after the image creation 422 s->parent_cid = vmdk_read_cid(bs,1); 423 } else { 424 goto fail; 425 } 426 427 /* read the L1 table */ 428 l1_size = s->l1_size * sizeof(uint32_t); 429 s->l1_table = qemu_malloc(l1_size); 430 if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, l1_size) != l1_size) 431 goto fail; 432 for(i = 0; i < s->l1_size; i++) { 433 le32_to_cpus(&s->l1_table[i]); 434 } 435 436 if (s->l1_backup_table_offset) { 437 s->l1_backup_table = qemu_malloc(l1_size); 438 if (bdrv_pread(s->hd, s->l1_backup_table_offset, s->l1_backup_table, l1_size) != l1_size) 439 goto fail; 440 for(i = 0; i < s->l1_size; i++) { 441 le32_to_cpus(&s->l1_backup_table[i]); 442 } 443 } 444 445 s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint32_t)); 446 return 0; 447 fail: 448 qemu_free(s->l1_backup_table); 449 qemu_free(s->l1_table); 450 qemu_free(s->l2_cache); 451 bdrv_delete(s->hd); 452 return -1; 453 } 454 455 static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data, 456 uint64_t offset, int allocate); 457 458 static int get_whole_cluster(BlockDriverState *bs, uint64_t cluster_offset, 459 uint64_t offset, int allocate) 460 { 461 uint64_t parent_cluster_offset; 462 BDRVVmdkState *s = bs->opaque; 463 uint8_t whole_grain[s->cluster_sectors*512]; // 128 sectors * 512 bytes each = grain size 64KB 464 465 // we will be here if it's first write on non-exist grain(cluster). 466 // try to read from parent image, if exist 467 if (s->hd->backing_hd) { 468 BDRVVmdkState *ps = s->hd->backing_hd->opaque; 469 470 if (!vmdk_is_cid_valid(bs)) 471 return -1; 472 473 parent_cluster_offset = get_cluster_offset(s->hd->backing_hd, NULL, offset, allocate); 474 475 if (parent_cluster_offset) { 476 BDRVVmdkState *act_s = activeBDRV.hd->opaque; 477 478 if (bdrv_pread(ps->hd, parent_cluster_offset, whole_grain, ps->cluster_sectors*512) != ps->cluster_sectors*512) 479 return -1; 480 481 //Write grain only into the active image 482 if (bdrv_pwrite(act_s->hd, activeBDRV.cluster_offset << 9, whole_grain, sizeof(whole_grain)) != sizeof(whole_grain)) 483 return -1; 484 } 485 } 486 return 0; 487 } 488 489 static int vmdk_L2update(BlockDriverState *bs, VmdkMetaData *m_data) 490 { 491 BDRVVmdkState *s = bs->opaque; 492 493 /* update L2 table */ 494 if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), 495 &(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset)) 496 return -1; 497 /* update backup L2 table */ 498 if (s->l1_backup_table_offset != 0) { 499 m_data->l2_offset = s->l1_backup_table[m_data->l1_index]; 500 if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), 501 &(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset)) 502 return -1; 503 } 504 505 return 0; 506 } 507 508 static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data, 509 uint64_t offset, int allocate) 510 { 511 BDRVVmdkState *s = bs->opaque; 512 unsigned int l1_index, l2_offset, l2_index; 513 int min_index, i, j; 514 uint32_t min_count, *l2_table, tmp = 0; 515 uint64_t cluster_offset; 516 517 if (m_data) 518 m_data->valid = 0; 519 520 l1_index = (offset >> 9) / s->l1_entry_sectors; 521 if (l1_index >= s->l1_size) 522 return 0; 523 l2_offset = s->l1_table[l1_index]; 524 if (!l2_offset) 525 return 0; 526 for(i = 0; i < L2_CACHE_SIZE; i++) { 527 if (l2_offset == s->l2_cache_offsets[i]) { 528 /* increment the hit count */ 529 if (++s->l2_cache_counts[i] == 0xffffffff) { 530 for(j = 0; j < L2_CACHE_SIZE; j++) { 531 s->l2_cache_counts[j] >>= 1; 532 } 533 } 534 l2_table = s->l2_cache + (i * s->l2_size); 535 goto found; 536 } 537 } 538 /* not found: load a new entry in the least used one */ 539 min_index = 0; 540 min_count = 0xffffffff; 541 for(i = 0; i < L2_CACHE_SIZE; i++) { 542 if (s->l2_cache_counts[i] < min_count) { 543 min_count = s->l2_cache_counts[i]; 544 min_index = i; 545 } 546 } 547 l2_table = s->l2_cache + (min_index * s->l2_size); 548 if (bdrv_pread(s->hd, (int64_t)l2_offset * 512, l2_table, s->l2_size * sizeof(uint32_t)) != 549 s->l2_size * sizeof(uint32_t)) 550 return 0; 551 552 s->l2_cache_offsets[min_index] = l2_offset; 553 s->l2_cache_counts[min_index] = 1; 554 found: 555 l2_index = ((offset >> 9) / s->cluster_sectors) % s->l2_size; 556 cluster_offset = le32_to_cpu(l2_table[l2_index]); 557 558 if (!cluster_offset) { 559 if (!allocate) 560 return 0; 561 // Avoid the L2 tables update for the images that have snapshots. 562 if (!s->is_parent) { 563 cluster_offset = bdrv_getlength(s->hd); 564 bdrv_truncate(s->hd, cluster_offset + (s->cluster_sectors << 9)); 565 566 cluster_offset >>= 9; 567 tmp = cpu_to_le32(cluster_offset); 568 l2_table[l2_index] = tmp; 569 // Save the active image state 570 activeBDRV.cluster_offset = cluster_offset; 571 activeBDRV.hd = bs; 572 } 573 /* First of all we write grain itself, to avoid race condition 574 * that may to corrupt the image. 575 * This problem may occur because of insufficient space on host disk 576 * or inappropriate VM shutdown. 577 */ 578 if (get_whole_cluster(bs, cluster_offset, offset, allocate) == -1) 579 return 0; 580 581 if (m_data) { 582 m_data->offset = tmp; 583 m_data->l1_index = l1_index; 584 m_data->l2_index = l2_index; 585 m_data->l2_offset = l2_offset; 586 m_data->valid = 1; 587 } 588 } 589 cluster_offset <<= 9; 590 return cluster_offset; 591 } 592 593 static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, 594 int nb_sectors, int *pnum) 595 { 596 BDRVVmdkState *s = bs->opaque; 597 int index_in_cluster, n; 598 uint64_t cluster_offset; 599 600 cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0); 601 index_in_cluster = sector_num % s->cluster_sectors; 602 n = s->cluster_sectors - index_in_cluster; 603 if (n > nb_sectors) 604 n = nb_sectors; 605 *pnum = n; 606 return (cluster_offset != 0); 607 } 608 609 static int vmdk_read(BlockDriverState *bs, int64_t sector_num, 610 uint8_t *buf, int nb_sectors) 611 { 612 BDRVVmdkState *s = bs->opaque; 613 int index_in_cluster, n, ret; 614 uint64_t cluster_offset; 615 616 while (nb_sectors > 0) { 617 cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0); 618 index_in_cluster = sector_num % s->cluster_sectors; 619 n = s->cluster_sectors - index_in_cluster; 620 if (n > nb_sectors) 621 n = nb_sectors; 622 if (!cluster_offset) { 623 // try to read from parent image, if exist 624 if (s->hd->backing_hd) { 625 if (!vmdk_is_cid_valid(bs)) 626 return -1; 627 ret = bdrv_read(s->hd->backing_hd, sector_num, buf, n); 628 if (ret < 0) 629 return -1; 630 } else { 631 memset(buf, 0, 512 * n); 632 } 633 } else { 634 if(bdrv_pread(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) 635 return -1; 636 } 637 nb_sectors -= n; 638 sector_num += n; 639 buf += n * 512; 640 } 641 return 0; 642 } 643 644 static int vmdk_write(BlockDriverState *bs, int64_t sector_num, 645 const uint8_t *buf, int nb_sectors) 646 { 647 BDRVVmdkState *s = bs->opaque; 648 VmdkMetaData m_data; 649 int index_in_cluster, n; 650 uint64_t cluster_offset; 651 static int cid_update = 0; 652 653 if (sector_num > bs->total_sectors) { 654 fprintf(stderr, 655 "(VMDK) Wrong offset: sector_num=0x%" PRIx64 656 " total_sectors=0x%" PRIx64 "\n", 657 sector_num, bs->total_sectors); 658 return -1; 659 } 660 661 while (nb_sectors > 0) { 662 index_in_cluster = sector_num & (s->cluster_sectors - 1); 663 n = s->cluster_sectors - index_in_cluster; 664 if (n > nb_sectors) 665 n = nb_sectors; 666 cluster_offset = get_cluster_offset(bs, &m_data, sector_num << 9, 1); 667 if (!cluster_offset) 668 return -1; 669 670 if (bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) 671 return -1; 672 if (m_data.valid) { 673 /* update L2 tables */ 674 if (vmdk_L2update(bs, &m_data) == -1) 675 return -1; 676 } 677 nb_sectors -= n; 678 sector_num += n; 679 buf += n * 512; 680 681 // update CID on the first write every time the virtual disk is opened 682 if (!cid_update) { 683 vmdk_write_cid(bs, time(NULL)); 684 cid_update++; 685 } 686 } 687 return 0; 688 } 689 690 static int vmdk_create(const char *filename, QEMUOptionParameter *options) 691 { 692 int fd, i; 693 VMDK4Header header; 694 uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; 695 static const char desc_template[] = 696 "# Disk DescriptorFile\n" 697 "version=1\n" 698 "CID=%x\n" 699 "parentCID=ffffffff\n" 700 "createType=\"monolithicSparse\"\n" 701 "\n" 702 "# Extent description\n" 703 "RW %" PRId64 " SPARSE \"%s\"\n" 704 "\n" 705 "# The Disk Data Base \n" 706 "#DDB\n" 707 "\n" 708 "ddb.virtualHWVersion = \"%d\"\n" 709 "ddb.geometry.cylinders = \"%" PRId64 "\"\n" 710 "ddb.geometry.heads = \"16\"\n" 711 "ddb.geometry.sectors = \"63\"\n" 712 "ddb.adapterType = \"ide\"\n"; 713 char desc[1024]; 714 const char *real_filename, *temp_str; 715 int64_t total_size = 0; 716 const char *backing_file = NULL; 717 int flags = 0; 718 719 // Read out options 720 while (options && options->name) { 721 if (!strcmp(options->name, BLOCK_OPT_SIZE)) { 722 total_size = options->value.n / 512; 723 } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { 724 backing_file = options->value.s; 725 } else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { 726 flags |= options->value.n ? BLOCK_FLAG_COMPAT6: 0; 727 } 728 options++; 729 } 730 731 /* XXX: add support for backing file */ 732 if (backing_file) { 733 return vmdk_snapshot_create(filename, backing_file); 734 } 735 736 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 737 0644); 738 if (fd < 0) 739 return -1; 740 magic = cpu_to_be32(VMDK4_MAGIC); 741 memset(&header, 0, sizeof(header)); 742 header.version = cpu_to_le32(1); 743 header.flags = cpu_to_le32(3); /* ?? */ 744 header.capacity = cpu_to_le64(total_size); 745 header.granularity = cpu_to_le64(128); 746 header.num_gtes_per_gte = cpu_to_le32(512); 747 748 grains = (total_size + header.granularity - 1) / header.granularity; 749 gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; 750 gt_count = (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte; 751 gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; 752 753 header.desc_offset = 1; 754 header.desc_size = 20; 755 header.rgd_offset = header.desc_offset + header.desc_size; 756 header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); 757 header.grain_offset = 758 ((header.gd_offset + gd_size + (gt_size * gt_count) + 759 header.granularity - 1) / header.granularity) * 760 header.granularity; 761 762 header.desc_offset = cpu_to_le64(header.desc_offset); 763 header.desc_size = cpu_to_le64(header.desc_size); 764 header.rgd_offset = cpu_to_le64(header.rgd_offset); 765 header.gd_offset = cpu_to_le64(header.gd_offset); 766 header.grain_offset = cpu_to_le64(header.grain_offset); 767 768 header.check_bytes[0] = 0xa; 769 header.check_bytes[1] = 0x20; 770 header.check_bytes[2] = 0xd; 771 header.check_bytes[3] = 0xa; 772 773 /* write all the data */ 774 write(fd, &magic, sizeof(magic)); 775 write(fd, &header, sizeof(header)); 776 777 ftruncate(fd, header.grain_offset << 9); 778 779 /* write grain directory */ 780 lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET); 781 for (i = 0, tmp = header.rgd_offset + gd_size; 782 i < gt_count; i++, tmp += gt_size) 783 write(fd, &tmp, sizeof(tmp)); 784 785 /* write backup grain directory */ 786 lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET); 787 for (i = 0, tmp = header.gd_offset + gd_size; 788 i < gt_count; i++, tmp += gt_size) 789 write(fd, &tmp, sizeof(tmp)); 790 791 /* compose the descriptor */ 792 real_filename = filename; 793 if ((temp_str = strrchr(real_filename, '\\')) != NULL) 794 real_filename = temp_str + 1; 795 if ((temp_str = strrchr(real_filename, '/')) != NULL) 796 real_filename = temp_str + 1; 797 if ((temp_str = strrchr(real_filename, ':')) != NULL) 798 real_filename = temp_str + 1; 799 snprintf(desc, sizeof(desc), desc_template, (unsigned int)time(NULL), 800 total_size, real_filename, 801 (flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), 802 total_size / (int64_t)(63 * 16)); 803 804 /* write the descriptor */ 805 lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET); 806 write(fd, desc, strlen(desc)); 807 808 close(fd); 809 return 0; 810 } 811 812 static void vmdk_close(BlockDriverState *bs) 813 { 814 BDRVVmdkState *s = bs->opaque; 815 816 qemu_free(s->l1_table); 817 qemu_free(s->l2_cache); 818 // try to close parent image, if exist 819 vmdk_parent_close(s->hd); 820 bdrv_delete(s->hd); 821 } 822 823 static void vmdk_flush(BlockDriverState *bs) 824 { 825 BDRVVmdkState *s = bs->opaque; 826 bdrv_flush(s->hd); 827 } 828 829 830 static QEMUOptionParameter vmdk_create_options[] = { 831 { 832 .name = BLOCK_OPT_SIZE, 833 .type = OPT_SIZE, 834 .help = "Virtual disk size" 835 }, 836 { 837 .name = BLOCK_OPT_BACKING_FILE, 838 .type = OPT_STRING, 839 .help = "File name of a base image" 840 }, 841 { 842 .name = BLOCK_OPT_COMPAT6, 843 .type = OPT_FLAG, 844 .help = "VMDK version 6 image" 845 }, 846 { NULL } 847 }; 848 849 static BlockDriver bdrv_vmdk = { 850 .format_name = "vmdk", 851 .instance_size = sizeof(BDRVVmdkState), 852 .bdrv_probe = vmdk_probe, 853 .bdrv_open = vmdk_open, 854 .bdrv_read = vmdk_read, 855 .bdrv_write = vmdk_write, 856 .bdrv_close = vmdk_close, 857 .bdrv_create = vmdk_create, 858 .bdrv_flush = vmdk_flush, 859 .bdrv_is_allocated = vmdk_is_allocated, 860 861 .create_options = vmdk_create_options, 862 }; 863 864 static void bdrv_vmdk_init(void) 865 { 866 bdrv_register(&bdrv_vmdk); 867 } 868 869 block_init(bdrv_vmdk_init); 870
