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/qdict.h" 31 #include "qapi/qmp/qerror.h" 32 #include "qemu/error-report.h" 33 #include "qemu/module.h" 34 #include "qemu/option.h" 35 #include "qemu/bswap.h" 36 #include "qemu/memalign.h" 37 #include "migration/blocker.h" 38 #include "qemu/cutils.h" 39 #include <zlib.h> 40 41 #define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D') 42 #define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V') 43 #define VMDK4_COMPRESSION_DEFLATE 1 44 #define VMDK4_FLAG_NL_DETECT (1 << 0) 45 #define VMDK4_FLAG_RGD (1 << 1) 46 /* Zeroed-grain enable bit */ 47 #define VMDK4_FLAG_ZERO_GRAIN (1 << 2) 48 #define VMDK4_FLAG_COMPRESS (1 << 16) 49 #define VMDK4_FLAG_MARKER (1 << 17) 50 #define VMDK4_GD_AT_END 0xffffffffffffffffULL 51 52 #define VMDK_EXTENT_MAX_SECTORS (1ULL << 32) 53 54 #define VMDK_GTE_ZEROED 0x1 55 56 /* VMDK internal error codes */ 57 #define VMDK_OK 0 58 #define VMDK_ERROR (-1) 59 /* Cluster not allocated */ 60 #define VMDK_UNALLOC (-2) 61 #define VMDK_ZEROED (-3) 62 63 #define BLOCK_OPT_ZEROED_GRAIN "zeroed_grain" 64 #define BLOCK_OPT_TOOLSVERSION "toolsversion" 65 66 typedef struct { 67 uint32_t version; 68 uint32_t flags; 69 uint32_t disk_sectors; 70 uint32_t granularity; 71 uint32_t l1dir_offset; 72 uint32_t l1dir_size; 73 uint32_t file_sectors; 74 uint32_t cylinders; 75 uint32_t heads; 76 uint32_t sectors_per_track; 77 } QEMU_PACKED VMDK3Header; 78 79 typedef struct { 80 uint32_t version; 81 uint32_t flags; 82 uint64_t capacity; 83 uint64_t granularity; 84 uint64_t desc_offset; 85 uint64_t desc_size; 86 /* Number of GrainTableEntries per GrainTable */ 87 uint32_t num_gtes_per_gt; 88 uint64_t rgd_offset; 89 uint64_t gd_offset; 90 uint64_t grain_offset; 91 char filler[1]; 92 char check_bytes[4]; 93 uint16_t compressAlgorithm; 94 } QEMU_PACKED VMDK4Header; 95 96 typedef struct VMDKSESparseConstHeader { 97 uint64_t magic; 98 uint64_t version; 99 uint64_t capacity; 100 uint64_t grain_size; 101 uint64_t grain_table_size; 102 uint64_t flags; 103 uint64_t reserved1; 104 uint64_t reserved2; 105 uint64_t reserved3; 106 uint64_t reserved4; 107 uint64_t volatile_header_offset; 108 uint64_t volatile_header_size; 109 uint64_t journal_header_offset; 110 uint64_t journal_header_size; 111 uint64_t journal_offset; 112 uint64_t journal_size; 113 uint64_t grain_dir_offset; 114 uint64_t grain_dir_size; 115 uint64_t grain_tables_offset; 116 uint64_t grain_tables_size; 117 uint64_t free_bitmap_offset; 118 uint64_t free_bitmap_size; 119 uint64_t backmap_offset; 120 uint64_t backmap_size; 121 uint64_t grains_offset; 122 uint64_t grains_size; 123 uint8_t pad[304]; 124 } QEMU_PACKED VMDKSESparseConstHeader; 125 126 typedef struct VMDKSESparseVolatileHeader { 127 uint64_t magic; 128 uint64_t free_gt_number; 129 uint64_t next_txn_seq_number; 130 uint64_t replay_journal; 131 uint8_t pad[480]; 132 } QEMU_PACKED VMDKSESparseVolatileHeader; 133 134 #define L2_CACHE_SIZE 16 135 136 typedef struct VmdkExtent { 137 BdrvChild *file; 138 bool flat; 139 bool compressed; 140 bool has_marker; 141 bool has_zero_grain; 142 bool sesparse; 143 uint64_t sesparse_l2_tables_offset; 144 uint64_t sesparse_clusters_offset; 145 int32_t entry_size; 146 int version; 147 int64_t sectors; 148 int64_t end_sector; 149 int64_t flat_start_offset; 150 int64_t l1_table_offset; 151 int64_t l1_backup_table_offset; 152 void *l1_table; 153 uint32_t *l1_backup_table; 154 unsigned int l1_size; 155 uint32_t l1_entry_sectors; 156 157 unsigned int l2_size; 158 void *l2_cache; 159 uint32_t l2_cache_offsets[L2_CACHE_SIZE]; 160 uint32_t l2_cache_counts[L2_CACHE_SIZE]; 161 162 int64_t cluster_sectors; 163 int64_t next_cluster_sector; 164 char *type; 165 } VmdkExtent; 166 167 typedef struct BDRVVmdkState { 168 CoMutex lock; 169 uint64_t desc_offset; 170 bool cid_updated; 171 bool cid_checked; 172 uint32_t cid; 173 uint32_t parent_cid; 174 int num_extents; 175 /* Extent array with num_extents entries, ascend ordered by address */ 176 VmdkExtent *extents; 177 Error *migration_blocker; 178 char *create_type; 179 } BDRVVmdkState; 180 181 typedef struct BDRVVmdkReopenState { 182 bool *extents_using_bs_file; 183 } BDRVVmdkReopenState; 184 185 typedef struct VmdkMetaData { 186 unsigned int l1_index; 187 unsigned int l2_index; 188 unsigned int l2_offset; 189 bool new_allocation; 190 uint32_t *l2_cache_entry; 191 } VmdkMetaData; 192 193 typedef struct VmdkGrainMarker { 194 uint64_t lba; 195 uint32_t size; 196 uint8_t data[]; 197 } QEMU_PACKED VmdkGrainMarker; 198 199 enum { 200 MARKER_END_OF_STREAM = 0, 201 MARKER_GRAIN_TABLE = 1, 202 MARKER_GRAIN_DIRECTORY = 2, 203 MARKER_FOOTER = 3, 204 }; 205 206 static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename) 207 { 208 uint32_t magic; 209 210 if (buf_size < 4) { 211 return 0; 212 } 213 magic = be32_to_cpu(*(uint32_t *)buf); 214 if (magic == VMDK3_MAGIC || 215 magic == VMDK4_MAGIC) { 216 return 100; 217 } else { 218 const char *p = (const char *)buf; 219 const char *end = p + buf_size; 220 while (p < end) { 221 if (*p == '#') { 222 /* skip comment line */ 223 while (p < end && *p != '\n') { 224 p++; 225 } 226 p++; 227 continue; 228 } 229 if (*p == ' ') { 230 while (p < end && *p == ' ') { 231 p++; 232 } 233 /* skip '\r' if windows line endings used. */ 234 if (p < end && *p == '\r') { 235 p++; 236 } 237 /* only accept blank lines before 'version=' line */ 238 if (p == end || *p != '\n') { 239 return 0; 240 } 241 p++; 242 continue; 243 } 244 if (end - p >= strlen("version=X\n")) { 245 if (strncmp("version=1\n", p, strlen("version=1\n")) == 0 || 246 strncmp("version=2\n", p, strlen("version=2\n")) == 0 || 247 strncmp("version=3\n", p, strlen("version=3\n")) == 0) { 248 return 100; 249 } 250 } 251 if (end - p >= strlen("version=X\r\n")) { 252 if (strncmp("version=1\r\n", p, strlen("version=1\r\n")) == 0 || 253 strncmp("version=2\r\n", p, strlen("version=2\r\n")) == 0 || 254 strncmp("version=3\r\n", p, strlen("version=3\r\n")) == 0) { 255 return 100; 256 } 257 } 258 return 0; 259 } 260 return 0; 261 } 262 } 263 264 #define SECTOR_SIZE 512 265 #define DESC_SIZE (20 * SECTOR_SIZE) /* 20 sectors of 512 bytes each */ 266 #define BUF_SIZE 4096 267 #define HEADER_SIZE 512 /* first sector of 512 bytes */ 268 269 static void vmdk_free_extents(BlockDriverState *bs) 270 { 271 int i; 272 BDRVVmdkState *s = bs->opaque; 273 VmdkExtent *e; 274 275 for (i = 0; i < s->num_extents; i++) { 276 e = &s->extents[i]; 277 g_free(e->l1_table); 278 g_free(e->l2_cache); 279 g_free(e->l1_backup_table); 280 g_free(e->type); 281 if (e->file != bs->file) { 282 bdrv_unref_child(bs, e->file); 283 } 284 } 285 g_free(s->extents); 286 } 287 288 static void vmdk_free_last_extent(BlockDriverState *bs) 289 { 290 BDRVVmdkState *s = bs->opaque; 291 292 if (s->num_extents == 0) { 293 return; 294 } 295 s->num_extents--; 296 s->extents = g_renew(VmdkExtent, s->extents, s->num_extents); 297 } 298 299 /* Return -ve errno, or 0 on success and write CID into *pcid. */ 300 static int vmdk_read_cid(BlockDriverState *bs, int parent, uint32_t *pcid) 301 { 302 char *desc; 303 uint32_t cid; 304 const char *p_name, *cid_str; 305 size_t cid_str_size; 306 BDRVVmdkState *s = bs->opaque; 307 int ret; 308 309 desc = g_malloc0(DESC_SIZE); 310 ret = bdrv_pread(bs->file, s->desc_offset, DESC_SIZE, desc, 0); 311 if (ret < 0) { 312 goto out; 313 } 314 315 if (parent) { 316 cid_str = "parentCID"; 317 cid_str_size = sizeof("parentCID"); 318 } else { 319 cid_str = "CID"; 320 cid_str_size = sizeof("CID"); 321 } 322 323 desc[DESC_SIZE - 1] = '\0'; 324 p_name = strstr(desc, cid_str); 325 if (p_name == NULL) { 326 ret = -EINVAL; 327 goto out; 328 } 329 p_name += cid_str_size; 330 if (sscanf(p_name, "%" SCNx32, &cid) != 1) { 331 ret = -EINVAL; 332 goto out; 333 } 334 *pcid = cid; 335 ret = 0; 336 337 out: 338 g_free(desc); 339 return ret; 340 } 341 342 static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) 343 { 344 char *desc, *tmp_desc; 345 char *p_name, *tmp_str; 346 BDRVVmdkState *s = bs->opaque; 347 int ret = 0; 348 349 desc = g_malloc0(DESC_SIZE); 350 tmp_desc = g_malloc0(DESC_SIZE); 351 ret = bdrv_pread(bs->file, s->desc_offset, DESC_SIZE, desc, 0); 352 if (ret < 0) { 353 goto out; 354 } 355 356 desc[DESC_SIZE - 1] = '\0'; 357 tmp_str = strstr(desc, "parentCID"); 358 if (tmp_str == NULL) { 359 ret = -EINVAL; 360 goto out; 361 } 362 363 pstrcpy(tmp_desc, DESC_SIZE, tmp_str); 364 p_name = strstr(desc, "CID"); 365 if (p_name != NULL) { 366 p_name += sizeof("CID"); 367 snprintf(p_name, DESC_SIZE - (p_name - desc), "%" PRIx32 "\n", cid); 368 pstrcat(desc, DESC_SIZE, tmp_desc); 369 } 370 371 ret = bdrv_pwrite_sync(bs->file, s->desc_offset, DESC_SIZE, desc, 0); 372 373 out: 374 g_free(desc); 375 g_free(tmp_desc); 376 return ret; 377 } 378 379 static int coroutine_fn vmdk_is_cid_valid(BlockDriverState *bs) 380 { 381 BDRVVmdkState *s = bs->opaque; 382 uint32_t cur_pcid; 383 384 if (!s->cid_checked && bs->backing) { 385 BlockDriverState *p_bs = bs->backing->bs; 386 387 if (strcmp(p_bs->drv->format_name, "vmdk")) { 388 /* Backing file is not in vmdk format, so it does not have 389 * a CID, which makes the overlay's parent CID invalid */ 390 return 0; 391 } 392 393 if (vmdk_read_cid(p_bs, 0, &cur_pcid) != 0) { 394 /* read failure: report as not valid */ 395 return 0; 396 } 397 if (s->parent_cid != cur_pcid) { 398 /* CID not valid */ 399 return 0; 400 } 401 } 402 s->cid_checked = true; 403 /* CID valid */ 404 return 1; 405 } 406 407 static int vmdk_reopen_prepare(BDRVReopenState *state, 408 BlockReopenQueue *queue, Error **errp) 409 { 410 BDRVVmdkState *s; 411 BDRVVmdkReopenState *rs; 412 int i; 413 414 assert(state != NULL); 415 assert(state->bs != NULL); 416 assert(state->opaque == NULL); 417 418 s = state->bs->opaque; 419 420 rs = g_new0(BDRVVmdkReopenState, 1); 421 state->opaque = rs; 422 423 /* 424 * Check whether there are any extents stored in bs->file; if bs->file 425 * changes, we will need to update their .file pointers to follow suit 426 */ 427 rs->extents_using_bs_file = g_new(bool, s->num_extents); 428 for (i = 0; i < s->num_extents; i++) { 429 rs->extents_using_bs_file[i] = s->extents[i].file == state->bs->file; 430 } 431 432 return 0; 433 } 434 435 static void vmdk_reopen_clean(BDRVReopenState *state) 436 { 437 BDRVVmdkReopenState *rs = state->opaque; 438 439 g_free(rs->extents_using_bs_file); 440 g_free(rs); 441 state->opaque = NULL; 442 } 443 444 static void vmdk_reopen_commit(BDRVReopenState *state) 445 { 446 BDRVVmdkState *s = state->bs->opaque; 447 BDRVVmdkReopenState *rs = state->opaque; 448 int i; 449 450 for (i = 0; i < s->num_extents; i++) { 451 if (rs->extents_using_bs_file[i]) { 452 s->extents[i].file = state->bs->file; 453 } 454 } 455 456 vmdk_reopen_clean(state); 457 } 458 459 static void vmdk_reopen_abort(BDRVReopenState *state) 460 { 461 vmdk_reopen_clean(state); 462 } 463 464 static int vmdk_parent_open(BlockDriverState *bs) 465 { 466 char *p_name; 467 char *desc; 468 BDRVVmdkState *s = bs->opaque; 469 int ret; 470 471 desc = g_malloc0(DESC_SIZE + 1); 472 ret = bdrv_pread(bs->file, s->desc_offset, DESC_SIZE, desc, 0); 473 if (ret < 0) { 474 goto out; 475 } 476 477 p_name = strstr(desc, "parentFileNameHint"); 478 if (p_name != NULL) { 479 char *end_name; 480 481 p_name += sizeof("parentFileNameHint") + 1; 482 end_name = strchr(p_name, '\"'); 483 if (end_name == NULL) { 484 ret = -EINVAL; 485 goto out; 486 } 487 if ((end_name - p_name) > sizeof(bs->auto_backing_file) - 1) { 488 ret = -EINVAL; 489 goto out; 490 } 491 492 pstrcpy(bs->auto_backing_file, end_name - p_name + 1, p_name); 493 pstrcpy(bs->backing_file, sizeof(bs->backing_file), 494 bs->auto_backing_file); 495 pstrcpy(bs->backing_format, sizeof(bs->backing_format), 496 "vmdk"); 497 } 498 499 out: 500 g_free(desc); 501 return ret; 502 } 503 504 /* Create and append extent to the extent array. Return the added VmdkExtent 505 * address. return NULL if allocation failed. */ 506 static int vmdk_add_extent(BlockDriverState *bs, 507 BdrvChild *file, bool flat, int64_t sectors, 508 int64_t l1_offset, int64_t l1_backup_offset, 509 uint32_t l1_size, 510 int l2_size, uint64_t cluster_sectors, 511 VmdkExtent **new_extent, 512 Error **errp) 513 { 514 VmdkExtent *extent; 515 BDRVVmdkState *s = bs->opaque; 516 int64_t nb_sectors; 517 518 if (cluster_sectors > 0x200000) { 519 /* 0x200000 * 512Bytes = 1GB for one cluster is unrealistic */ 520 error_setg(errp, "Invalid granularity, image may be corrupt"); 521 return -EFBIG; 522 } 523 if (l1_size > 32 * 1024 * 1024) { 524 /* 525 * Although with big capacity and small l1_entry_sectors, we can get a 526 * big l1_size, we don't want unbounded value to allocate the table. 527 * Limit it to 32M, which is enough to store: 528 * 8TB - for both VMDK3 & VMDK4 with 529 * minimal cluster size: 512B 530 * minimal L2 table size: 512 entries 531 * 8 TB is still more than the maximal value supported for 532 * VMDK3 & VMDK4 which is 2TB. 533 * 64TB - for "ESXi seSparse Extent" 534 * minimal cluster size: 512B (default is 4KB) 535 * L2 table size: 4096 entries (const). 536 * 64TB is more than the maximal value supported for 537 * seSparse VMDKs (which is slightly less than 64TB) 538 */ 539 error_setg(errp, "L1 size too big"); 540 return -EFBIG; 541 } 542 543 nb_sectors = bdrv_nb_sectors(file->bs); 544 if (nb_sectors < 0) { 545 return nb_sectors; 546 } 547 548 s->extents = g_renew(VmdkExtent, s->extents, s->num_extents + 1); 549 extent = &s->extents[s->num_extents]; 550 s->num_extents++; 551 552 memset(extent, 0, sizeof(VmdkExtent)); 553 extent->file = file; 554 extent->flat = flat; 555 extent->sectors = sectors; 556 extent->l1_table_offset = l1_offset; 557 extent->l1_backup_table_offset = l1_backup_offset; 558 extent->l1_size = l1_size; 559 extent->l1_entry_sectors = l2_size * cluster_sectors; 560 extent->l2_size = l2_size; 561 extent->cluster_sectors = flat ? sectors : cluster_sectors; 562 extent->next_cluster_sector = ROUND_UP(nb_sectors, cluster_sectors); 563 extent->entry_size = sizeof(uint32_t); 564 565 if (s->num_extents > 1) { 566 extent->end_sector = (*(extent - 1)).end_sector + extent->sectors; 567 } else { 568 extent->end_sector = extent->sectors; 569 } 570 bs->total_sectors = extent->end_sector; 571 if (new_extent) { 572 *new_extent = extent; 573 } 574 return 0; 575 } 576 577 static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent, 578 Error **errp) 579 { 580 int ret; 581 size_t l1_size; 582 int i; 583 584 /* read the L1 table */ 585 l1_size = extent->l1_size * extent->entry_size; 586 extent->l1_table = g_try_malloc(l1_size); 587 if (l1_size && extent->l1_table == NULL) { 588 return -ENOMEM; 589 } 590 591 ret = bdrv_pread(extent->file, extent->l1_table_offset, l1_size, 592 extent->l1_table, 0); 593 if (ret < 0) { 594 bdrv_refresh_filename(extent->file->bs); 595 error_setg_errno(errp, -ret, 596 "Could not read l1 table from extent '%s'", 597 extent->file->bs->filename); 598 goto fail_l1; 599 } 600 for (i = 0; i < extent->l1_size; i++) { 601 if (extent->entry_size == sizeof(uint64_t)) { 602 le64_to_cpus((uint64_t *)extent->l1_table + i); 603 } else { 604 assert(extent->entry_size == sizeof(uint32_t)); 605 le32_to_cpus((uint32_t *)extent->l1_table + i); 606 } 607 } 608 609 if (extent->l1_backup_table_offset) { 610 assert(!extent->sesparse); 611 extent->l1_backup_table = g_try_malloc(l1_size); 612 if (l1_size && extent->l1_backup_table == NULL) { 613 ret = -ENOMEM; 614 goto fail_l1; 615 } 616 ret = bdrv_pread(extent->file, extent->l1_backup_table_offset, 617 l1_size, extent->l1_backup_table, 0); 618 if (ret < 0) { 619 bdrv_refresh_filename(extent->file->bs); 620 error_setg_errno(errp, -ret, 621 "Could not read l1 backup table from extent '%s'", 622 extent->file->bs->filename); 623 goto fail_l1b; 624 } 625 for (i = 0; i < extent->l1_size; i++) { 626 le32_to_cpus(&extent->l1_backup_table[i]); 627 } 628 } 629 630 extent->l2_cache = 631 g_malloc(extent->entry_size * extent->l2_size * L2_CACHE_SIZE); 632 return 0; 633 fail_l1b: 634 g_free(extent->l1_backup_table); 635 fail_l1: 636 g_free(extent->l1_table); 637 return ret; 638 } 639 640 static int vmdk_open_vmfs_sparse(BlockDriverState *bs, 641 BdrvChild *file, 642 int flags, Error **errp) 643 { 644 int ret; 645 uint32_t magic; 646 VMDK3Header header; 647 VmdkExtent *extent = NULL; 648 649 ret = bdrv_pread(file, sizeof(magic), sizeof(header), &header, 0); 650 if (ret < 0) { 651 bdrv_refresh_filename(file->bs); 652 error_setg_errno(errp, -ret, 653 "Could not read header from file '%s'", 654 file->bs->filename); 655 return ret; 656 } 657 ret = vmdk_add_extent(bs, file, false, 658 le32_to_cpu(header.disk_sectors), 659 (int64_t)le32_to_cpu(header.l1dir_offset) << 9, 660 0, 661 le32_to_cpu(header.l1dir_size), 662 4096, 663 le32_to_cpu(header.granularity), 664 &extent, 665 errp); 666 if (ret < 0) { 667 return ret; 668 } 669 ret = vmdk_init_tables(bs, extent, errp); 670 if (ret) { 671 /* free extent allocated by vmdk_add_extent */ 672 vmdk_free_last_extent(bs); 673 } 674 return ret; 675 } 676 677 #define SESPARSE_CONST_HEADER_MAGIC UINT64_C(0x00000000cafebabe) 678 #define SESPARSE_VOLATILE_HEADER_MAGIC UINT64_C(0x00000000cafecafe) 679 680 /* Strict checks - format not officially documented */ 681 static int check_se_sparse_const_header(VMDKSESparseConstHeader *header, 682 Error **errp) 683 { 684 header->magic = le64_to_cpu(header->magic); 685 header->version = le64_to_cpu(header->version); 686 header->grain_size = le64_to_cpu(header->grain_size); 687 header->grain_table_size = le64_to_cpu(header->grain_table_size); 688 header->flags = le64_to_cpu(header->flags); 689 header->reserved1 = le64_to_cpu(header->reserved1); 690 header->reserved2 = le64_to_cpu(header->reserved2); 691 header->reserved3 = le64_to_cpu(header->reserved3); 692 header->reserved4 = le64_to_cpu(header->reserved4); 693 694 header->volatile_header_offset = 695 le64_to_cpu(header->volatile_header_offset); 696 header->volatile_header_size = le64_to_cpu(header->volatile_header_size); 697 698 header->journal_header_offset = le64_to_cpu(header->journal_header_offset); 699 header->journal_header_size = le64_to_cpu(header->journal_header_size); 700 701 header->journal_offset = le64_to_cpu(header->journal_offset); 702 header->journal_size = le64_to_cpu(header->journal_size); 703 704 header->grain_dir_offset = le64_to_cpu(header->grain_dir_offset); 705 header->grain_dir_size = le64_to_cpu(header->grain_dir_size); 706 707 header->grain_tables_offset = le64_to_cpu(header->grain_tables_offset); 708 header->grain_tables_size = le64_to_cpu(header->grain_tables_size); 709 710 header->free_bitmap_offset = le64_to_cpu(header->free_bitmap_offset); 711 header->free_bitmap_size = le64_to_cpu(header->free_bitmap_size); 712 713 header->backmap_offset = le64_to_cpu(header->backmap_offset); 714 header->backmap_size = le64_to_cpu(header->backmap_size); 715 716 header->grains_offset = le64_to_cpu(header->grains_offset); 717 header->grains_size = le64_to_cpu(header->grains_size); 718 719 if (header->magic != SESPARSE_CONST_HEADER_MAGIC) { 720 error_setg(errp, "Bad const header magic: 0x%016" PRIx64, 721 header->magic); 722 return -EINVAL; 723 } 724 725 if (header->version != 0x0000000200000001) { 726 error_setg(errp, "Unsupported version: 0x%016" PRIx64, 727 header->version); 728 return -ENOTSUP; 729 } 730 731 if (header->grain_size != 8) { 732 error_setg(errp, "Unsupported grain size: %" PRIu64, 733 header->grain_size); 734 return -ENOTSUP; 735 } 736 737 if (header->grain_table_size != 64) { 738 error_setg(errp, "Unsupported grain table size: %" PRIu64, 739 header->grain_table_size); 740 return -ENOTSUP; 741 } 742 743 if (header->flags != 0) { 744 error_setg(errp, "Unsupported flags: 0x%016" PRIx64, 745 header->flags); 746 return -ENOTSUP; 747 } 748 749 if (header->reserved1 != 0 || header->reserved2 != 0 || 750 header->reserved3 != 0 || header->reserved4 != 0) { 751 error_setg(errp, "Unsupported reserved bits:" 752 " 0x%016" PRIx64 " 0x%016" PRIx64 753 " 0x%016" PRIx64 " 0x%016" PRIx64, 754 header->reserved1, header->reserved2, 755 header->reserved3, header->reserved4); 756 return -ENOTSUP; 757 } 758 759 /* check that padding is 0 */ 760 if (!buffer_is_zero(header->pad, sizeof(header->pad))) { 761 error_setg(errp, "Unsupported non-zero const header padding"); 762 return -ENOTSUP; 763 } 764 765 return 0; 766 } 767 768 static int check_se_sparse_volatile_header(VMDKSESparseVolatileHeader *header, 769 Error **errp) 770 { 771 header->magic = le64_to_cpu(header->magic); 772 header->free_gt_number = le64_to_cpu(header->free_gt_number); 773 header->next_txn_seq_number = le64_to_cpu(header->next_txn_seq_number); 774 header->replay_journal = le64_to_cpu(header->replay_journal); 775 776 if (header->magic != SESPARSE_VOLATILE_HEADER_MAGIC) { 777 error_setg(errp, "Bad volatile header magic: 0x%016" PRIx64, 778 header->magic); 779 return -EINVAL; 780 } 781 782 if (header->replay_journal) { 783 error_setg(errp, "Image is dirty, Replaying journal not supported"); 784 return -ENOTSUP; 785 } 786 787 /* check that padding is 0 */ 788 if (!buffer_is_zero(header->pad, sizeof(header->pad))) { 789 error_setg(errp, "Unsupported non-zero volatile header padding"); 790 return -ENOTSUP; 791 } 792 793 return 0; 794 } 795 796 static int vmdk_open_se_sparse(BlockDriverState *bs, 797 BdrvChild *file, 798 int flags, Error **errp) 799 { 800 int ret; 801 VMDKSESparseConstHeader const_header; 802 VMDKSESparseVolatileHeader volatile_header; 803 VmdkExtent *extent = NULL; 804 805 ret = bdrv_apply_auto_read_only(bs, 806 "No write support for seSparse images available", errp); 807 if (ret < 0) { 808 return ret; 809 } 810 811 assert(sizeof(const_header) == SECTOR_SIZE); 812 813 ret = bdrv_pread(file, 0, sizeof(const_header), &const_header, 0); 814 if (ret < 0) { 815 bdrv_refresh_filename(file->bs); 816 error_setg_errno(errp, -ret, 817 "Could not read const header from file '%s'", 818 file->bs->filename); 819 return ret; 820 } 821 822 /* check const header */ 823 ret = check_se_sparse_const_header(&const_header, errp); 824 if (ret < 0) { 825 return ret; 826 } 827 828 assert(sizeof(volatile_header) == SECTOR_SIZE); 829 830 ret = bdrv_pread(file, const_header.volatile_header_offset * SECTOR_SIZE, 831 sizeof(volatile_header), &volatile_header, 0); 832 if (ret < 0) { 833 bdrv_refresh_filename(file->bs); 834 error_setg_errno(errp, -ret, 835 "Could not read volatile header from file '%s'", 836 file->bs->filename); 837 return ret; 838 } 839 840 /* check volatile header */ 841 ret = check_se_sparse_volatile_header(&volatile_header, errp); 842 if (ret < 0) { 843 return ret; 844 } 845 846 ret = vmdk_add_extent(bs, file, false, 847 const_header.capacity, 848 const_header.grain_dir_offset * SECTOR_SIZE, 849 0, 850 const_header.grain_dir_size * 851 SECTOR_SIZE / sizeof(uint64_t), 852 const_header.grain_table_size * 853 SECTOR_SIZE / sizeof(uint64_t), 854 const_header.grain_size, 855 &extent, 856 errp); 857 if (ret < 0) { 858 return ret; 859 } 860 861 extent->sesparse = true; 862 extent->sesparse_l2_tables_offset = const_header.grain_tables_offset; 863 extent->sesparse_clusters_offset = const_header.grains_offset; 864 extent->entry_size = sizeof(uint64_t); 865 866 ret = vmdk_init_tables(bs, extent, errp); 867 if (ret) { 868 /* free extent allocated by vmdk_add_extent */ 869 vmdk_free_last_extent(bs); 870 } 871 872 return ret; 873 } 874 875 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf, 876 QDict *options, Error **errp); 877 878 static char *vmdk_read_desc(BdrvChild *file, uint64_t desc_offset, Error **errp) 879 { 880 int64_t size; 881 char *buf; 882 int ret; 883 884 size = bdrv_getlength(file->bs); 885 if (size < 0) { 886 error_setg_errno(errp, -size, "Could not access file"); 887 return NULL; 888 } 889 890 if (size < 4) { 891 /* Both descriptor file and sparse image must be much larger than 4 892 * bytes, also callers of vmdk_read_desc want to compare the first 4 893 * bytes with VMDK4_MAGIC, let's error out if less is read. */ 894 error_setg(errp, "File is too small, not a valid image"); 895 return NULL; 896 } 897 898 size = MIN(size, (1 << 20) - 1); /* avoid unbounded allocation */ 899 buf = g_malloc(size + 1); 900 901 ret = bdrv_pread(file, desc_offset, size, buf, 0); 902 if (ret < 0) { 903 error_setg_errno(errp, -ret, "Could not read from file"); 904 g_free(buf); 905 return NULL; 906 } 907 buf[size] = 0; 908 909 return buf; 910 } 911 912 static int vmdk_open_vmdk4(BlockDriverState *bs, 913 BdrvChild *file, 914 int flags, QDict *options, Error **errp) 915 { 916 int ret; 917 uint32_t magic; 918 uint32_t l1_size, l1_entry_sectors; 919 VMDK4Header header; 920 VmdkExtent *extent = NULL; 921 BDRVVmdkState *s = bs->opaque; 922 int64_t l1_backup_offset = 0; 923 bool compressed; 924 925 ret = bdrv_pread(file, sizeof(magic), sizeof(header), &header, 0); 926 if (ret < 0) { 927 bdrv_refresh_filename(file->bs); 928 error_setg_errno(errp, -ret, 929 "Could not read header from file '%s'", 930 file->bs->filename); 931 return -EINVAL; 932 } 933 if (header.capacity == 0) { 934 uint64_t desc_offset = le64_to_cpu(header.desc_offset); 935 if (desc_offset) { 936 char *buf = vmdk_read_desc(file, desc_offset << 9, errp); 937 if (!buf) { 938 return -EINVAL; 939 } 940 ret = vmdk_open_desc_file(bs, flags, buf, options, errp); 941 g_free(buf); 942 return ret; 943 } 944 } 945 946 if (!s->create_type) { 947 s->create_type = g_strdup("monolithicSparse"); 948 } 949 950 if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) { 951 /* 952 * The footer takes precedence over the header, so read it in. The 953 * footer starts at offset -1024 from the end: One sector for the 954 * footer, and another one for the end-of-stream marker. 955 */ 956 struct { 957 struct { 958 uint64_t val; 959 uint32_t size; 960 uint32_t type; 961 uint8_t pad[512 - 16]; 962 } QEMU_PACKED footer_marker; 963 964 uint32_t magic; 965 VMDK4Header header; 966 uint8_t pad[512 - 4 - sizeof(VMDK4Header)]; 967 968 struct { 969 uint64_t val; 970 uint32_t size; 971 uint32_t type; 972 uint8_t pad[512 - 16]; 973 } QEMU_PACKED eos_marker; 974 } QEMU_PACKED footer; 975 976 ret = bdrv_pread(file, bs->file->bs->total_sectors * 512 - 1536, 977 sizeof(footer), &footer, 0); 978 if (ret < 0) { 979 error_setg_errno(errp, -ret, "Failed to read footer"); 980 return ret; 981 } 982 983 /* Some sanity checks for the footer */ 984 if (be32_to_cpu(footer.magic) != VMDK4_MAGIC || 985 le32_to_cpu(footer.footer_marker.size) != 0 || 986 le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER || 987 le64_to_cpu(footer.eos_marker.val) != 0 || 988 le32_to_cpu(footer.eos_marker.size) != 0 || 989 le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM) 990 { 991 error_setg(errp, "Invalid footer"); 992 return -EINVAL; 993 } 994 995 header = footer.header; 996 } 997 998 compressed = 999 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; 1000 if (le32_to_cpu(header.version) > 3) { 1001 error_setg(errp, "Unsupported VMDK version %" PRIu32, 1002 le32_to_cpu(header.version)); 1003 return -ENOTSUP; 1004 } else if (le32_to_cpu(header.version) == 3 && (flags & BDRV_O_RDWR) && 1005 !compressed) { 1006 /* VMware KB 2064959 explains that version 3 added support for 1007 * persistent changed block tracking (CBT), and backup software can 1008 * read it as version=1 if it doesn't care about the changed area 1009 * information. So we are safe to enable read only. */ 1010 error_setg(errp, "VMDK version 3 must be read only"); 1011 return -EINVAL; 1012 } 1013 1014 if (le32_to_cpu(header.num_gtes_per_gt) > 512) { 1015 error_setg(errp, "L2 table size too big"); 1016 return -EINVAL; 1017 } 1018 1019 l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gt) 1020 * le64_to_cpu(header.granularity); 1021 if (l1_entry_sectors == 0) { 1022 error_setg(errp, "L1 entry size is invalid"); 1023 return -EINVAL; 1024 } 1025 l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1) 1026 / l1_entry_sectors; 1027 if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) { 1028 l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9; 1029 } 1030 if (bdrv_nb_sectors(file->bs) < le64_to_cpu(header.grain_offset)) { 1031 error_setg(errp, "File truncated, expecting at least %" PRId64 " bytes", 1032 (int64_t)(le64_to_cpu(header.grain_offset) 1033 * BDRV_SECTOR_SIZE)); 1034 return -EINVAL; 1035 } 1036 1037 ret = vmdk_add_extent(bs, file, false, 1038 le64_to_cpu(header.capacity), 1039 le64_to_cpu(header.gd_offset) << 9, 1040 l1_backup_offset, 1041 l1_size, 1042 le32_to_cpu(header.num_gtes_per_gt), 1043 le64_to_cpu(header.granularity), 1044 &extent, 1045 errp); 1046 if (ret < 0) { 1047 return ret; 1048 } 1049 extent->compressed = 1050 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; 1051 if (extent->compressed) { 1052 g_free(s->create_type); 1053 s->create_type = g_strdup("streamOptimized"); 1054 } 1055 extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER; 1056 extent->version = le32_to_cpu(header.version); 1057 extent->has_zero_grain = le32_to_cpu(header.flags) & VMDK4_FLAG_ZERO_GRAIN; 1058 ret = vmdk_init_tables(bs, extent, errp); 1059 if (ret) { 1060 /* free extent allocated by vmdk_add_extent */ 1061 vmdk_free_last_extent(bs); 1062 } 1063 return ret; 1064 } 1065 1066 /* find an option value out of descriptor file */ 1067 static int vmdk_parse_description(const char *desc, const char *opt_name, 1068 char *buf, int buf_size) 1069 { 1070 char *opt_pos, *opt_end; 1071 const char *end = desc + strlen(desc); 1072 1073 opt_pos = strstr(desc, opt_name); 1074 if (!opt_pos) { 1075 return VMDK_ERROR; 1076 } 1077 /* Skip "=\"" following opt_name */ 1078 opt_pos += strlen(opt_name) + 2; 1079 if (opt_pos >= end) { 1080 return VMDK_ERROR; 1081 } 1082 opt_end = opt_pos; 1083 while (opt_end < end && *opt_end != '"') { 1084 opt_end++; 1085 } 1086 if (opt_end == end || buf_size < opt_end - opt_pos + 1) { 1087 return VMDK_ERROR; 1088 } 1089 pstrcpy(buf, opt_end - opt_pos + 1, opt_pos); 1090 return VMDK_OK; 1091 } 1092 1093 /* Open an extent file and append to bs array */ 1094 static int vmdk_open_sparse(BlockDriverState *bs, BdrvChild *file, int flags, 1095 char *buf, QDict *options, Error **errp) 1096 { 1097 uint32_t magic; 1098 1099 magic = ldl_be_p(buf); 1100 switch (magic) { 1101 case VMDK3_MAGIC: 1102 return vmdk_open_vmfs_sparse(bs, file, flags, errp); 1103 case VMDK4_MAGIC: 1104 return vmdk_open_vmdk4(bs, file, flags, options, errp); 1105 default: 1106 error_setg(errp, "Image not in VMDK format"); 1107 return -EINVAL; 1108 } 1109 } 1110 1111 static const char *next_line(const char *s) 1112 { 1113 while (*s) { 1114 if (*s == '\n') { 1115 return s + 1; 1116 } 1117 s++; 1118 } 1119 return s; 1120 } 1121 1122 static int vmdk_parse_extents(const char *desc, BlockDriverState *bs, 1123 QDict *options, Error **errp) 1124 { 1125 int ret; 1126 int matches; 1127 char access[11]; 1128 char type[11]; 1129 char fname[512]; 1130 const char *p, *np; 1131 int64_t sectors = 0; 1132 int64_t flat_offset; 1133 char *desc_file_dir = NULL; 1134 char *extent_path; 1135 BdrvChild *extent_file; 1136 BdrvChildRole extent_role; 1137 BDRVVmdkState *s = bs->opaque; 1138 VmdkExtent *extent = NULL; 1139 char extent_opt_prefix[32]; 1140 Error *local_err = NULL; 1141 1142 for (p = desc; *p; p = next_line(p)) { 1143 /* parse extent line in one of below formats: 1144 * 1145 * RW [size in sectors] FLAT "file-name.vmdk" OFFSET 1146 * RW [size in sectors] SPARSE "file-name.vmdk" 1147 * RW [size in sectors] VMFS "file-name.vmdk" 1148 * RW [size in sectors] VMFSSPARSE "file-name.vmdk" 1149 * RW [size in sectors] SESPARSE "file-name.vmdk" 1150 */ 1151 flat_offset = -1; 1152 matches = sscanf(p, "%10s %" SCNd64 " %10s \"%511[^\n\r\"]\" %" SCNd64, 1153 access, §ors, type, fname, &flat_offset); 1154 if (matches < 4 || strcmp(access, "RW")) { 1155 continue; 1156 } else if (!strcmp(type, "FLAT")) { 1157 if (matches != 5 || flat_offset < 0) { 1158 goto invalid; 1159 } 1160 } else if (!strcmp(type, "VMFS")) { 1161 if (matches == 4) { 1162 flat_offset = 0; 1163 } else { 1164 goto invalid; 1165 } 1166 } else if (matches != 4) { 1167 goto invalid; 1168 } 1169 1170 if (sectors <= 0 || 1171 (strcmp(type, "FLAT") && strcmp(type, "SPARSE") && 1172 strcmp(type, "VMFS") && strcmp(type, "VMFSSPARSE") && 1173 strcmp(type, "SESPARSE")) || 1174 (strcmp(access, "RW"))) { 1175 continue; 1176 } 1177 1178 if (path_is_absolute(fname)) { 1179 extent_path = g_strdup(fname); 1180 } else { 1181 if (!desc_file_dir) { 1182 desc_file_dir = bdrv_dirname(bs->file->bs, errp); 1183 if (!desc_file_dir) { 1184 bdrv_refresh_filename(bs->file->bs); 1185 error_prepend(errp, "Cannot use relative paths with VMDK " 1186 "descriptor file '%s': ", 1187 bs->file->bs->filename); 1188 ret = -EINVAL; 1189 goto out; 1190 } 1191 } 1192 1193 extent_path = g_strconcat(desc_file_dir, fname, NULL); 1194 } 1195 1196 ret = snprintf(extent_opt_prefix, 32, "extents.%d", s->num_extents); 1197 assert(ret < 32); 1198 1199 extent_role = BDRV_CHILD_DATA; 1200 if (strcmp(type, "FLAT") != 0 && strcmp(type, "VMFS") != 0) { 1201 /* non-flat extents have metadata */ 1202 extent_role |= BDRV_CHILD_METADATA; 1203 } 1204 1205 extent_file = bdrv_open_child(extent_path, options, extent_opt_prefix, 1206 bs, &child_of_bds, extent_role, false, 1207 &local_err); 1208 g_free(extent_path); 1209 if (local_err) { 1210 error_propagate(errp, local_err); 1211 ret = -EINVAL; 1212 goto out; 1213 } 1214 1215 /* save to extents array */ 1216 if (!strcmp(type, "FLAT") || !strcmp(type, "VMFS")) { 1217 /* FLAT extent */ 1218 1219 ret = vmdk_add_extent(bs, extent_file, true, sectors, 1220 0, 0, 0, 0, 0, &extent, errp); 1221 if (ret < 0) { 1222 bdrv_unref_child(bs, extent_file); 1223 goto out; 1224 } 1225 extent->flat_start_offset = flat_offset << 9; 1226 } else if (!strcmp(type, "SPARSE") || !strcmp(type, "VMFSSPARSE")) { 1227 /* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/ 1228 char *buf = vmdk_read_desc(extent_file, 0, errp); 1229 if (!buf) { 1230 ret = -EINVAL; 1231 } else { 1232 ret = vmdk_open_sparse(bs, extent_file, bs->open_flags, buf, 1233 options, errp); 1234 } 1235 g_free(buf); 1236 if (ret) { 1237 bdrv_unref_child(bs, extent_file); 1238 goto out; 1239 } 1240 extent = &s->extents[s->num_extents - 1]; 1241 } else if (!strcmp(type, "SESPARSE")) { 1242 ret = vmdk_open_se_sparse(bs, extent_file, bs->open_flags, errp); 1243 if (ret) { 1244 bdrv_unref_child(bs, extent_file); 1245 goto out; 1246 } 1247 extent = &s->extents[s->num_extents - 1]; 1248 } else { 1249 error_setg(errp, "Unsupported extent type '%s'", type); 1250 bdrv_unref_child(bs, extent_file); 1251 ret = -ENOTSUP; 1252 goto out; 1253 } 1254 extent->type = g_strdup(type); 1255 } 1256 1257 ret = 0; 1258 goto out; 1259 1260 invalid: 1261 np = next_line(p); 1262 assert(np != p); 1263 if (np[-1] == '\n') { 1264 np--; 1265 } 1266 error_setg(errp, "Invalid extent line: %.*s", (int)(np - p), p); 1267 ret = -EINVAL; 1268 1269 out: 1270 g_free(desc_file_dir); 1271 return ret; 1272 } 1273 1274 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf, 1275 QDict *options, Error **errp) 1276 { 1277 int ret; 1278 char ct[128]; 1279 BDRVVmdkState *s = bs->opaque; 1280 1281 if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) { 1282 error_setg(errp, "invalid VMDK image descriptor"); 1283 ret = -EINVAL; 1284 goto exit; 1285 } 1286 if (strcmp(ct, "monolithicFlat") && 1287 strcmp(ct, "vmfs") && 1288 strcmp(ct, "vmfsSparse") && 1289 strcmp(ct, "seSparse") && 1290 strcmp(ct, "twoGbMaxExtentSparse") && 1291 strcmp(ct, "twoGbMaxExtentFlat")) { 1292 error_setg(errp, "Unsupported image type '%s'", ct); 1293 ret = -ENOTSUP; 1294 goto exit; 1295 } 1296 s->create_type = g_strdup(ct); 1297 s->desc_offset = 0; 1298 ret = vmdk_parse_extents(buf, bs, options, errp); 1299 exit: 1300 return ret; 1301 } 1302 1303 static int vmdk_open(BlockDriverState *bs, QDict *options, int flags, 1304 Error **errp) 1305 { 1306 char *buf; 1307 int ret; 1308 BDRVVmdkState *s = bs->opaque; 1309 uint32_t magic; 1310 1311 ret = bdrv_open_file_child(NULL, options, "file", bs, errp); 1312 if (ret < 0) { 1313 return ret; 1314 } 1315 1316 buf = vmdk_read_desc(bs->file, 0, errp); 1317 if (!buf) { 1318 return -EINVAL; 1319 } 1320 1321 magic = ldl_be_p(buf); 1322 switch (magic) { 1323 case VMDK3_MAGIC: 1324 case VMDK4_MAGIC: 1325 ret = vmdk_open_sparse(bs, bs->file, flags, buf, options, 1326 errp); 1327 s->desc_offset = 0x200; 1328 break; 1329 default: 1330 /* No data in the descriptor file */ 1331 bs->file->role &= ~BDRV_CHILD_DATA; 1332 1333 /* Must succeed because we have given up permissions if anything */ 1334 bdrv_child_refresh_perms(bs, bs->file, &error_abort); 1335 1336 ret = vmdk_open_desc_file(bs, flags, buf, options, errp); 1337 break; 1338 } 1339 if (ret) { 1340 goto fail; 1341 } 1342 1343 /* try to open parent images, if exist */ 1344 ret = vmdk_parent_open(bs); 1345 if (ret) { 1346 goto fail; 1347 } 1348 ret = vmdk_read_cid(bs, 0, &s->cid); 1349 if (ret) { 1350 goto fail; 1351 } 1352 ret = vmdk_read_cid(bs, 1, &s->parent_cid); 1353 if (ret) { 1354 goto fail; 1355 } 1356 qemu_co_mutex_init(&s->lock); 1357 1358 /* Disable migration when VMDK images are used */ 1359 error_setg(&s->migration_blocker, "The vmdk format used by node '%s' " 1360 "does not support live migration", 1361 bdrv_get_device_or_node_name(bs)); 1362 ret = migrate_add_blocker(s->migration_blocker, errp); 1363 if (ret < 0) { 1364 error_free(s->migration_blocker); 1365 goto fail; 1366 } 1367 1368 g_free(buf); 1369 return 0; 1370 1371 fail: 1372 g_free(buf); 1373 g_free(s->create_type); 1374 s->create_type = NULL; 1375 vmdk_free_extents(bs); 1376 return ret; 1377 } 1378 1379 1380 static void vmdk_refresh_limits(BlockDriverState *bs, Error **errp) 1381 { 1382 BDRVVmdkState *s = bs->opaque; 1383 int i; 1384 1385 for (i = 0; i < s->num_extents; i++) { 1386 if (!s->extents[i].flat) { 1387 bs->bl.pwrite_zeroes_alignment = 1388 MAX(bs->bl.pwrite_zeroes_alignment, 1389 s->extents[i].cluster_sectors << BDRV_SECTOR_BITS); 1390 } 1391 } 1392 } 1393 1394 /** 1395 * get_whole_cluster 1396 * 1397 * Copy backing file's cluster that covers @sector_num, otherwise write zero, 1398 * to the cluster at @cluster_sector_num. If @zeroed is true, we're overwriting 1399 * a zeroed cluster in the current layer and must not copy data from the 1400 * backing file. 1401 * 1402 * If @skip_start_sector < @skip_end_sector, the relative range 1403 * [@skip_start_sector, @skip_end_sector) is not copied or written, and leave 1404 * it for call to write user data in the request. 1405 */ 1406 static int coroutine_fn GRAPH_RDLOCK 1407 get_whole_cluster(BlockDriverState *bs, VmdkExtent *extent, 1408 uint64_t cluster_offset, uint64_t offset, 1409 uint64_t skip_start_bytes, uint64_t skip_end_bytes, 1410 bool zeroed) 1411 { 1412 int ret = VMDK_OK; 1413 int64_t cluster_bytes; 1414 uint8_t *whole_grain; 1415 bool copy_from_backing; 1416 1417 /* For COW, align request sector_num to cluster start */ 1418 cluster_bytes = extent->cluster_sectors << BDRV_SECTOR_BITS; 1419 offset = QEMU_ALIGN_DOWN(offset, cluster_bytes); 1420 whole_grain = qemu_blockalign(bs, cluster_bytes); 1421 copy_from_backing = bs->backing && !zeroed; 1422 1423 if (!copy_from_backing) { 1424 memset(whole_grain, 0, skip_start_bytes); 1425 memset(whole_grain + skip_end_bytes, 0, cluster_bytes - skip_end_bytes); 1426 } 1427 1428 assert(skip_end_bytes <= cluster_bytes); 1429 /* we will be here if it's first write on non-exist grain(cluster). 1430 * try to read from parent image, if exist */ 1431 if (bs->backing && !vmdk_is_cid_valid(bs)) { 1432 ret = VMDK_ERROR; 1433 goto exit; 1434 } 1435 1436 /* Read backing data before skip range */ 1437 if (skip_start_bytes > 0) { 1438 if (copy_from_backing) { 1439 /* qcow2 emits this on bs->file instead of bs->backing */ 1440 BLKDBG_EVENT(extent->file, BLKDBG_COW_READ); 1441 ret = bdrv_co_pread(bs->backing, offset, skip_start_bytes, 1442 whole_grain, 0); 1443 if (ret < 0) { 1444 ret = VMDK_ERROR; 1445 goto exit; 1446 } 1447 } 1448 BLKDBG_EVENT(extent->file, BLKDBG_COW_WRITE); 1449 ret = bdrv_co_pwrite(extent->file, cluster_offset, skip_start_bytes, 1450 whole_grain, 0); 1451 if (ret < 0) { 1452 ret = VMDK_ERROR; 1453 goto exit; 1454 } 1455 } 1456 /* Read backing data after skip range */ 1457 if (skip_end_bytes < cluster_bytes) { 1458 if (copy_from_backing) { 1459 /* qcow2 emits this on bs->file instead of bs->backing */ 1460 BLKDBG_EVENT(extent->file, BLKDBG_COW_READ); 1461 ret = bdrv_co_pread(bs->backing, offset + skip_end_bytes, 1462 cluster_bytes - skip_end_bytes, 1463 whole_grain + skip_end_bytes, 0); 1464 if (ret < 0) { 1465 ret = VMDK_ERROR; 1466 goto exit; 1467 } 1468 } 1469 BLKDBG_EVENT(extent->file, BLKDBG_COW_WRITE); 1470 ret = bdrv_co_pwrite(extent->file, cluster_offset + skip_end_bytes, 1471 cluster_bytes - skip_end_bytes, 1472 whole_grain + skip_end_bytes, 0); 1473 if (ret < 0) { 1474 ret = VMDK_ERROR; 1475 goto exit; 1476 } 1477 } 1478 1479 ret = VMDK_OK; 1480 exit: 1481 qemu_vfree(whole_grain); 1482 return ret; 1483 } 1484 1485 static int coroutine_fn GRAPH_RDLOCK 1486 vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data, uint32_t offset) 1487 { 1488 offset = cpu_to_le32(offset); 1489 /* update L2 table */ 1490 BLKDBG_EVENT(extent->file, BLKDBG_L2_UPDATE); 1491 if (bdrv_co_pwrite(extent->file, 1492 ((int64_t)m_data->l2_offset * 512) 1493 + (m_data->l2_index * sizeof(offset)), 1494 sizeof(offset), &offset, 0) < 0) { 1495 return VMDK_ERROR; 1496 } 1497 /* update backup L2 table */ 1498 if (extent->l1_backup_table_offset != 0) { 1499 m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; 1500 if (bdrv_co_pwrite(extent->file, 1501 ((int64_t)m_data->l2_offset * 512) 1502 + (m_data->l2_index * sizeof(offset)), 1503 sizeof(offset), &offset, 0) < 0) { 1504 return VMDK_ERROR; 1505 } 1506 } 1507 if (bdrv_co_flush(extent->file->bs) < 0) { 1508 return VMDK_ERROR; 1509 } 1510 if (m_data->l2_cache_entry) { 1511 *m_data->l2_cache_entry = offset; 1512 } 1513 1514 return VMDK_OK; 1515 } 1516 1517 /** 1518 * get_cluster_offset 1519 * 1520 * Look up cluster offset in extent file by sector number, and store in 1521 * @cluster_offset. 1522 * 1523 * For flat extents, the start offset as parsed from the description file is 1524 * returned. 1525 * 1526 * For sparse extents, look up in L1, L2 table. If allocate is true, return an 1527 * offset for a new cluster and update L2 cache. If there is a backing file, 1528 * COW is done before returning; otherwise, zeroes are written to the allocated 1529 * cluster. Both COW and zero writing skips the sector range 1530 * [@skip_start_sector, @skip_end_sector) passed in by caller, because caller 1531 * has new data to write there. 1532 * 1533 * Returns: VMDK_OK if cluster exists and mapped in the image. 1534 * VMDK_UNALLOC if cluster is not mapped and @allocate is false. 1535 * VMDK_ERROR if failed. 1536 */ 1537 static int coroutine_fn GRAPH_RDLOCK 1538 get_cluster_offset(BlockDriverState *bs, VmdkExtent *extent, 1539 VmdkMetaData *m_data, uint64_t offset, bool allocate, 1540 uint64_t *cluster_offset, uint64_t skip_start_bytes, 1541 uint64_t skip_end_bytes) 1542 { 1543 unsigned int l1_index, l2_offset, l2_index; 1544 int min_index, i, j; 1545 uint32_t min_count; 1546 void *l2_table; 1547 bool zeroed = false; 1548 int64_t ret; 1549 int64_t cluster_sector; 1550 unsigned int l2_size_bytes = extent->l2_size * extent->entry_size; 1551 1552 if (m_data) { 1553 m_data->new_allocation = false; 1554 } 1555 if (extent->flat) { 1556 *cluster_offset = extent->flat_start_offset; 1557 return VMDK_OK; 1558 } 1559 1560 offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE; 1561 l1_index = (offset >> 9) / extent->l1_entry_sectors; 1562 if (l1_index >= extent->l1_size) { 1563 return VMDK_ERROR; 1564 } 1565 if (extent->sesparse) { 1566 uint64_t l2_offset_u64; 1567 1568 assert(extent->entry_size == sizeof(uint64_t)); 1569 1570 l2_offset_u64 = ((uint64_t *)extent->l1_table)[l1_index]; 1571 if (l2_offset_u64 == 0) { 1572 l2_offset = 0; 1573 } else if ((l2_offset_u64 & 0xffffffff00000000) != 0x1000000000000000) { 1574 /* 1575 * Top most nibble is 0x1 if grain table is allocated. 1576 * strict check - top most 4 bytes must be 0x10000000 since max 1577 * supported size is 64TB for disk - so no more than 64TB / 16MB 1578 * grain directories which is smaller than uint32, 1579 * where 16MB is the only supported default grain table coverage. 1580 */ 1581 return VMDK_ERROR; 1582 } else { 1583 l2_offset_u64 = l2_offset_u64 & 0x00000000ffffffff; 1584 l2_offset_u64 = extent->sesparse_l2_tables_offset + 1585 l2_offset_u64 * l2_size_bytes / SECTOR_SIZE; 1586 if (l2_offset_u64 > 0x00000000ffffffff) { 1587 return VMDK_ERROR; 1588 } 1589 l2_offset = (unsigned int)(l2_offset_u64); 1590 } 1591 } else { 1592 assert(extent->entry_size == sizeof(uint32_t)); 1593 l2_offset = ((uint32_t *)extent->l1_table)[l1_index]; 1594 } 1595 if (!l2_offset) { 1596 return VMDK_UNALLOC; 1597 } 1598 for (i = 0; i < L2_CACHE_SIZE; i++) { 1599 if (l2_offset == extent->l2_cache_offsets[i]) { 1600 /* increment the hit count */ 1601 if (++extent->l2_cache_counts[i] == 0xffffffff) { 1602 for (j = 0; j < L2_CACHE_SIZE; j++) { 1603 extent->l2_cache_counts[j] >>= 1; 1604 } 1605 } 1606 l2_table = (char *)extent->l2_cache + (i * l2_size_bytes); 1607 goto found; 1608 } 1609 } 1610 /* not found: load a new entry in the least used one */ 1611 min_index = 0; 1612 min_count = 0xffffffff; 1613 for (i = 0; i < L2_CACHE_SIZE; i++) { 1614 if (extent->l2_cache_counts[i] < min_count) { 1615 min_count = extent->l2_cache_counts[i]; 1616 min_index = i; 1617 } 1618 } 1619 l2_table = (char *)extent->l2_cache + (min_index * l2_size_bytes); 1620 BLKDBG_EVENT(extent->file, BLKDBG_L2_LOAD); 1621 if (bdrv_co_pread(extent->file, 1622 (int64_t)l2_offset * 512, 1623 l2_size_bytes, 1624 l2_table, 0 1625 ) < 0) { 1626 return VMDK_ERROR; 1627 } 1628 1629 extent->l2_cache_offsets[min_index] = l2_offset; 1630 extent->l2_cache_counts[min_index] = 1; 1631 found: 1632 l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size; 1633 if (m_data) { 1634 m_data->l1_index = l1_index; 1635 m_data->l2_index = l2_index; 1636 m_data->l2_offset = l2_offset; 1637 m_data->l2_cache_entry = ((uint32_t *)l2_table) + l2_index; 1638 } 1639 1640 if (extent->sesparse) { 1641 cluster_sector = le64_to_cpu(((uint64_t *)l2_table)[l2_index]); 1642 switch (cluster_sector & 0xf000000000000000) { 1643 case 0x0000000000000000: 1644 /* unallocated grain */ 1645 if (cluster_sector != 0) { 1646 return VMDK_ERROR; 1647 } 1648 break; 1649 case 0x1000000000000000: 1650 /* scsi-unmapped grain - fallthrough */ 1651 case 0x2000000000000000: 1652 /* zero grain */ 1653 zeroed = true; 1654 break; 1655 case 0x3000000000000000: 1656 /* allocated grain */ 1657 cluster_sector = (((cluster_sector & 0x0fff000000000000) >> 48) | 1658 ((cluster_sector & 0x0000ffffffffffff) << 12)); 1659 cluster_sector = extent->sesparse_clusters_offset + 1660 cluster_sector * extent->cluster_sectors; 1661 break; 1662 default: 1663 return VMDK_ERROR; 1664 } 1665 } else { 1666 cluster_sector = le32_to_cpu(((uint32_t *)l2_table)[l2_index]); 1667 1668 if (extent->has_zero_grain && cluster_sector == VMDK_GTE_ZEROED) { 1669 zeroed = true; 1670 } 1671 } 1672 1673 if (!cluster_sector || zeroed) { 1674 if (!allocate) { 1675 return zeroed ? VMDK_ZEROED : VMDK_UNALLOC; 1676 } 1677 assert(!extent->sesparse); 1678 1679 if (extent->next_cluster_sector >= VMDK_EXTENT_MAX_SECTORS) { 1680 return VMDK_ERROR; 1681 } 1682 1683 cluster_sector = extent->next_cluster_sector; 1684 extent->next_cluster_sector += extent->cluster_sectors; 1685 1686 /* First of all we write grain itself, to avoid race condition 1687 * that may to corrupt the image. 1688 * This problem may occur because of insufficient space on host disk 1689 * or inappropriate VM shutdown. 1690 */ 1691 ret = get_whole_cluster(bs, extent, cluster_sector * BDRV_SECTOR_SIZE, 1692 offset, skip_start_bytes, skip_end_bytes, 1693 zeroed); 1694 if (ret) { 1695 return ret; 1696 } 1697 if (m_data) { 1698 m_data->new_allocation = true; 1699 } 1700 } 1701 *cluster_offset = cluster_sector << BDRV_SECTOR_BITS; 1702 return VMDK_OK; 1703 } 1704 1705 static VmdkExtent *find_extent(BDRVVmdkState *s, 1706 int64_t sector_num, VmdkExtent *start_hint) 1707 { 1708 VmdkExtent *extent = start_hint; 1709 1710 if (!extent) { 1711 extent = &s->extents[0]; 1712 } 1713 while (extent < &s->extents[s->num_extents]) { 1714 if (sector_num < extent->end_sector) { 1715 return extent; 1716 } 1717 extent++; 1718 } 1719 return NULL; 1720 } 1721 1722 static inline uint64_t vmdk_find_offset_in_cluster(VmdkExtent *extent, 1723 int64_t offset) 1724 { 1725 uint64_t extent_begin_offset, extent_relative_offset; 1726 uint64_t cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE; 1727 1728 extent_begin_offset = 1729 (extent->end_sector - extent->sectors) * BDRV_SECTOR_SIZE; 1730 extent_relative_offset = offset - extent_begin_offset; 1731 return extent_relative_offset % cluster_size; 1732 } 1733 1734 static int coroutine_fn GRAPH_RDLOCK 1735 vmdk_co_block_status(BlockDriverState *bs, bool want_zero, 1736 int64_t offset, int64_t bytes, int64_t *pnum, 1737 int64_t *map, BlockDriverState **file) 1738 { 1739 BDRVVmdkState *s = bs->opaque; 1740 int64_t index_in_cluster, n, ret; 1741 uint64_t cluster_offset; 1742 VmdkExtent *extent; 1743 1744 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, NULL); 1745 if (!extent) { 1746 return -EIO; 1747 } 1748 qemu_co_mutex_lock(&s->lock); 1749 ret = get_cluster_offset(bs, extent, NULL, offset, false, &cluster_offset, 1750 0, 0); 1751 qemu_co_mutex_unlock(&s->lock); 1752 1753 index_in_cluster = vmdk_find_offset_in_cluster(extent, offset); 1754 switch (ret) { 1755 case VMDK_ERROR: 1756 ret = -EIO; 1757 break; 1758 case VMDK_UNALLOC: 1759 ret = 0; 1760 break; 1761 case VMDK_ZEROED: 1762 ret = BDRV_BLOCK_ZERO; 1763 break; 1764 case VMDK_OK: 1765 ret = BDRV_BLOCK_DATA; 1766 if (!extent->compressed) { 1767 ret |= BDRV_BLOCK_OFFSET_VALID; 1768 *map = cluster_offset + index_in_cluster; 1769 if (extent->flat) { 1770 ret |= BDRV_BLOCK_RECURSE; 1771 } 1772 } 1773 *file = extent->file->bs; 1774 break; 1775 } 1776 1777 n = extent->cluster_sectors * BDRV_SECTOR_SIZE - index_in_cluster; 1778 *pnum = MIN(n, bytes); 1779 return ret; 1780 } 1781 1782 static int coroutine_fn GRAPH_RDLOCK 1783 vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset, 1784 int64_t offset_in_cluster, QEMUIOVector *qiov, 1785 uint64_t qiov_offset, uint64_t n_bytes, 1786 uint64_t offset) 1787 { 1788 int ret; 1789 VmdkGrainMarker *data = NULL; 1790 uLongf buf_len; 1791 QEMUIOVector local_qiov; 1792 int64_t write_offset; 1793 int64_t write_end_sector; 1794 1795 if (extent->compressed) { 1796 void *compressed_data; 1797 1798 /* Only whole clusters */ 1799 if (offset_in_cluster || 1800 n_bytes > (extent->cluster_sectors * SECTOR_SIZE) || 1801 (n_bytes < (extent->cluster_sectors * SECTOR_SIZE) && 1802 offset + n_bytes != extent->end_sector * SECTOR_SIZE)) 1803 { 1804 ret = -EINVAL; 1805 goto out; 1806 } 1807 1808 if (!extent->has_marker) { 1809 ret = -EINVAL; 1810 goto out; 1811 } 1812 buf_len = (extent->cluster_sectors << 9) * 2; 1813 data = g_malloc(buf_len + sizeof(VmdkGrainMarker)); 1814 1815 compressed_data = g_malloc(n_bytes); 1816 qemu_iovec_to_buf(qiov, qiov_offset, compressed_data, n_bytes); 1817 ret = compress(data->data, &buf_len, compressed_data, n_bytes); 1818 g_free(compressed_data); 1819 1820 if (ret != Z_OK || buf_len == 0) { 1821 ret = -EINVAL; 1822 goto out; 1823 } 1824 1825 data->lba = cpu_to_le64(offset >> BDRV_SECTOR_BITS); 1826 data->size = cpu_to_le32(buf_len); 1827 1828 n_bytes = buf_len + sizeof(VmdkGrainMarker); 1829 qemu_iovec_init_buf(&local_qiov, data, n_bytes); 1830 1831 BLKDBG_EVENT(extent->file, BLKDBG_WRITE_COMPRESSED); 1832 } else { 1833 qemu_iovec_init(&local_qiov, qiov->niov); 1834 qemu_iovec_concat(&local_qiov, qiov, qiov_offset, n_bytes); 1835 1836 BLKDBG_EVENT(extent->file, BLKDBG_WRITE_AIO); 1837 } 1838 1839 write_offset = cluster_offset + offset_in_cluster; 1840 ret = bdrv_co_pwritev(extent->file, write_offset, n_bytes, 1841 &local_qiov, 0); 1842 1843 write_end_sector = DIV_ROUND_UP(write_offset + n_bytes, BDRV_SECTOR_SIZE); 1844 1845 if (extent->compressed) { 1846 extent->next_cluster_sector = write_end_sector; 1847 } else { 1848 extent->next_cluster_sector = MAX(extent->next_cluster_sector, 1849 write_end_sector); 1850 } 1851 1852 if (ret < 0) { 1853 goto out; 1854 } 1855 ret = 0; 1856 out: 1857 g_free(data); 1858 if (!extent->compressed) { 1859 qemu_iovec_destroy(&local_qiov); 1860 } 1861 return ret; 1862 } 1863 1864 static int coroutine_fn GRAPH_RDLOCK 1865 vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset, 1866 int64_t offset_in_cluster, QEMUIOVector *qiov, int bytes) 1867 { 1868 int ret; 1869 int cluster_bytes, buf_bytes; 1870 uint8_t *cluster_buf, *compressed_data; 1871 uint8_t *uncomp_buf; 1872 uint32_t data_len; 1873 VmdkGrainMarker *marker; 1874 uLongf buf_len; 1875 1876 1877 if (!extent->compressed) { 1878 BLKDBG_EVENT(extent->file, BLKDBG_READ_AIO); 1879 ret = bdrv_co_preadv(extent->file, 1880 cluster_offset + offset_in_cluster, bytes, 1881 qiov, 0); 1882 if (ret < 0) { 1883 return ret; 1884 } 1885 return 0; 1886 } 1887 cluster_bytes = extent->cluster_sectors * 512; 1888 /* Read two clusters in case GrainMarker + compressed data > one cluster */ 1889 buf_bytes = cluster_bytes * 2; 1890 cluster_buf = g_malloc(buf_bytes); 1891 uncomp_buf = g_malloc(cluster_bytes); 1892 BLKDBG_EVENT(extent->file, BLKDBG_READ_COMPRESSED); 1893 ret = bdrv_co_pread(extent->file, cluster_offset, buf_bytes, cluster_buf, 1894 0); 1895 if (ret < 0) { 1896 goto out; 1897 } 1898 compressed_data = cluster_buf; 1899 buf_len = cluster_bytes; 1900 data_len = cluster_bytes; 1901 if (extent->has_marker) { 1902 marker = (VmdkGrainMarker *)cluster_buf; 1903 compressed_data = marker->data; 1904 data_len = le32_to_cpu(marker->size); 1905 } 1906 if (!data_len || data_len > buf_bytes) { 1907 ret = -EINVAL; 1908 goto out; 1909 } 1910 ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len); 1911 if (ret != Z_OK) { 1912 ret = -EINVAL; 1913 goto out; 1914 1915 } 1916 if (offset_in_cluster < 0 || 1917 offset_in_cluster + bytes > buf_len) { 1918 ret = -EINVAL; 1919 goto out; 1920 } 1921 qemu_iovec_from_buf(qiov, 0, uncomp_buf + offset_in_cluster, bytes); 1922 ret = 0; 1923 1924 out: 1925 g_free(uncomp_buf); 1926 g_free(cluster_buf); 1927 return ret; 1928 } 1929 1930 static int coroutine_fn GRAPH_RDLOCK 1931 vmdk_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, 1932 QEMUIOVector *qiov, BdrvRequestFlags flags) 1933 { 1934 BDRVVmdkState *s = bs->opaque; 1935 int ret; 1936 uint64_t n_bytes, offset_in_cluster; 1937 VmdkExtent *extent = NULL; 1938 QEMUIOVector local_qiov; 1939 uint64_t cluster_offset; 1940 uint64_t bytes_done = 0; 1941 1942 qemu_iovec_init(&local_qiov, qiov->niov); 1943 qemu_co_mutex_lock(&s->lock); 1944 1945 while (bytes > 0) { 1946 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent); 1947 if (!extent) { 1948 ret = -EIO; 1949 goto fail; 1950 } 1951 ret = get_cluster_offset(bs, extent, NULL, 1952 offset, false, &cluster_offset, 0, 0); 1953 offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset); 1954 1955 n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE 1956 - offset_in_cluster); 1957 1958 if (ret != VMDK_OK) { 1959 /* if not allocated, try to read from parent image, if exist */ 1960 if (bs->backing && ret != VMDK_ZEROED) { 1961 if (!vmdk_is_cid_valid(bs)) { 1962 ret = -EINVAL; 1963 goto fail; 1964 } 1965 1966 qemu_iovec_reset(&local_qiov); 1967 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); 1968 1969 /* qcow2 emits this on bs->file instead of bs->backing */ 1970 BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); 1971 ret = bdrv_co_preadv(bs->backing, offset, n_bytes, 1972 &local_qiov, 0); 1973 if (ret < 0) { 1974 goto fail; 1975 } 1976 } else { 1977 qemu_iovec_memset(qiov, bytes_done, 0, n_bytes); 1978 } 1979 } else { 1980 qemu_iovec_reset(&local_qiov); 1981 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); 1982 1983 ret = vmdk_read_extent(extent, cluster_offset, offset_in_cluster, 1984 &local_qiov, n_bytes); 1985 if (ret) { 1986 goto fail; 1987 } 1988 } 1989 bytes -= n_bytes; 1990 offset += n_bytes; 1991 bytes_done += n_bytes; 1992 } 1993 1994 ret = 0; 1995 fail: 1996 qemu_co_mutex_unlock(&s->lock); 1997 qemu_iovec_destroy(&local_qiov); 1998 1999 return ret; 2000 } 2001 2002 /** 2003 * vmdk_write: 2004 * @zeroed: buf is ignored (data is zero), use zeroed_grain GTE feature 2005 * if possible, otherwise return -ENOTSUP. 2006 * @zero_dry_run: used for zeroed == true only, don't update L2 table, just try 2007 * with each cluster. By dry run we can find if the zero write 2008 * is possible without modifying image data. 2009 * 2010 * Returns: error code with 0 for success. 2011 */ 2012 static int coroutine_fn GRAPH_RDLOCK 2013 vmdk_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes, 2014 QEMUIOVector *qiov, bool zeroed, bool zero_dry_run) 2015 { 2016 BDRVVmdkState *s = bs->opaque; 2017 VmdkExtent *extent = NULL; 2018 int ret; 2019 int64_t offset_in_cluster, n_bytes; 2020 uint64_t cluster_offset; 2021 uint64_t bytes_done = 0; 2022 VmdkMetaData m_data; 2023 2024 if (DIV_ROUND_UP(offset, BDRV_SECTOR_SIZE) > bs->total_sectors) { 2025 error_report("Wrong offset: offset=0x%" PRIx64 2026 " total_sectors=0x%" PRIx64, 2027 offset, bs->total_sectors); 2028 return -EIO; 2029 } 2030 2031 while (bytes > 0) { 2032 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent); 2033 if (!extent) { 2034 return -EIO; 2035 } 2036 if (extent->sesparse) { 2037 return -ENOTSUP; 2038 } 2039 offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset); 2040 n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE 2041 - offset_in_cluster); 2042 2043 ret = get_cluster_offset(bs, extent, &m_data, offset, 2044 !(extent->compressed || zeroed), 2045 &cluster_offset, offset_in_cluster, 2046 offset_in_cluster + n_bytes); 2047 if (extent->compressed) { 2048 if (ret == VMDK_OK) { 2049 /* Refuse write to allocated cluster for streamOptimized */ 2050 error_report("Could not write to allocated cluster" 2051 " for streamOptimized"); 2052 return -EIO; 2053 } else if (!zeroed) { 2054 /* allocate */ 2055 ret = get_cluster_offset(bs, extent, &m_data, offset, 2056 true, &cluster_offset, 0, 0); 2057 } 2058 } 2059 if (ret == VMDK_ERROR) { 2060 return -EINVAL; 2061 } 2062 if (zeroed) { 2063 /* Do zeroed write, buf is ignored */ 2064 if (extent->has_zero_grain && 2065 offset_in_cluster == 0 && 2066 n_bytes >= extent->cluster_sectors * BDRV_SECTOR_SIZE) { 2067 n_bytes = extent->cluster_sectors * BDRV_SECTOR_SIZE; 2068 if (!zero_dry_run && ret != VMDK_ZEROED) { 2069 /* update L2 tables */ 2070 if (vmdk_L2update(extent, &m_data, VMDK_GTE_ZEROED) 2071 != VMDK_OK) { 2072 return -EIO; 2073 } 2074 } 2075 } else { 2076 return -ENOTSUP; 2077 } 2078 } else { 2079 ret = vmdk_write_extent(extent, cluster_offset, offset_in_cluster, 2080 qiov, bytes_done, n_bytes, offset); 2081 if (ret) { 2082 return ret; 2083 } 2084 if (m_data.new_allocation) { 2085 /* update L2 tables */ 2086 if (vmdk_L2update(extent, &m_data, 2087 cluster_offset >> BDRV_SECTOR_BITS) 2088 != VMDK_OK) { 2089 return -EIO; 2090 } 2091 } 2092 } 2093 bytes -= n_bytes; 2094 offset += n_bytes; 2095 bytes_done += n_bytes; 2096 2097 /* update CID on the first write every time the virtual disk is 2098 * opened */ 2099 if (!s->cid_updated) { 2100 ret = vmdk_write_cid(bs, g_random_int()); 2101 if (ret < 0) { 2102 return ret; 2103 } 2104 s->cid_updated = true; 2105 } 2106 } 2107 return 0; 2108 } 2109 2110 static int coroutine_fn GRAPH_RDLOCK 2111 vmdk_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, 2112 QEMUIOVector *qiov, BdrvRequestFlags flags) 2113 { 2114 int ret; 2115 BDRVVmdkState *s = bs->opaque; 2116 qemu_co_mutex_lock(&s->lock); 2117 ret = vmdk_pwritev(bs, offset, bytes, qiov, false, false); 2118 qemu_co_mutex_unlock(&s->lock); 2119 return ret; 2120 } 2121 2122 static int coroutine_fn GRAPH_RDLOCK 2123 vmdk_co_pwritev_compressed(BlockDriverState *bs, int64_t offset, int64_t bytes, 2124 QEMUIOVector *qiov) 2125 { 2126 if (bytes == 0) { 2127 /* The caller will write bytes 0 to signal EOF. 2128 * When receive it, we align EOF to a sector boundary. */ 2129 BDRVVmdkState *s = bs->opaque; 2130 int i, ret; 2131 int64_t length; 2132 2133 for (i = 0; i < s->num_extents; i++) { 2134 length = bdrv_getlength(s->extents[i].file->bs); 2135 if (length < 0) { 2136 return length; 2137 } 2138 length = QEMU_ALIGN_UP(length, BDRV_SECTOR_SIZE); 2139 ret = bdrv_co_truncate(s->extents[i].file, length, false, 2140 PREALLOC_MODE_OFF, 0, NULL); 2141 if (ret < 0) { 2142 return ret; 2143 } 2144 } 2145 return 0; 2146 } 2147 return vmdk_co_pwritev(bs, offset, bytes, qiov, 0); 2148 } 2149 2150 static int coroutine_fn GRAPH_RDLOCK 2151 vmdk_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes, 2152 BdrvRequestFlags flags) 2153 { 2154 int ret; 2155 BDRVVmdkState *s = bs->opaque; 2156 2157 qemu_co_mutex_lock(&s->lock); 2158 /* write zeroes could fail if sectors not aligned to cluster, test it with 2159 * dry_run == true before really updating image */ 2160 ret = vmdk_pwritev(bs, offset, bytes, NULL, true, true); 2161 if (!ret) { 2162 ret = vmdk_pwritev(bs, offset, bytes, NULL, true, false); 2163 } 2164 qemu_co_mutex_unlock(&s->lock); 2165 return ret; 2166 } 2167 2168 static int vmdk_init_extent(BlockBackend *blk, 2169 int64_t filesize, bool flat, 2170 bool compress, bool zeroed_grain, 2171 Error **errp) 2172 { 2173 int ret, i; 2174 VMDK4Header header; 2175 uint32_t tmp, magic, grains, gd_sectors, gt_size, gt_count; 2176 uint32_t *gd_buf = NULL; 2177 int gd_buf_size; 2178 2179 if (flat) { 2180 ret = blk_truncate(blk, filesize, false, PREALLOC_MODE_OFF, 0, errp); 2181 goto exit; 2182 } 2183 magic = cpu_to_be32(VMDK4_MAGIC); 2184 memset(&header, 0, sizeof(header)); 2185 if (compress) { 2186 header.version = 3; 2187 } else if (zeroed_grain) { 2188 header.version = 2; 2189 } else { 2190 header.version = 1; 2191 } 2192 header.flags = VMDK4_FLAG_RGD | VMDK4_FLAG_NL_DETECT 2193 | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0) 2194 | (zeroed_grain ? VMDK4_FLAG_ZERO_GRAIN : 0); 2195 header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0; 2196 header.capacity = filesize / BDRV_SECTOR_SIZE; 2197 header.granularity = 128; 2198 header.num_gtes_per_gt = BDRV_SECTOR_SIZE; 2199 2200 grains = DIV_ROUND_UP(filesize / BDRV_SECTOR_SIZE, header.granularity); 2201 gt_size = DIV_ROUND_UP(header.num_gtes_per_gt * sizeof(uint32_t), 2202 BDRV_SECTOR_SIZE); 2203 gt_count = DIV_ROUND_UP(grains, header.num_gtes_per_gt); 2204 gd_sectors = DIV_ROUND_UP(gt_count * sizeof(uint32_t), BDRV_SECTOR_SIZE); 2205 2206 header.desc_offset = 1; 2207 header.desc_size = 20; 2208 header.rgd_offset = header.desc_offset + header.desc_size; 2209 header.gd_offset = header.rgd_offset + gd_sectors + (gt_size * gt_count); 2210 header.grain_offset = 2211 ROUND_UP(header.gd_offset + gd_sectors + (gt_size * gt_count), 2212 header.granularity); 2213 /* swap endianness for all header fields */ 2214 header.version = cpu_to_le32(header.version); 2215 header.flags = cpu_to_le32(header.flags); 2216 header.capacity = cpu_to_le64(header.capacity); 2217 header.granularity = cpu_to_le64(header.granularity); 2218 header.num_gtes_per_gt = cpu_to_le32(header.num_gtes_per_gt); 2219 header.desc_offset = cpu_to_le64(header.desc_offset); 2220 header.desc_size = cpu_to_le64(header.desc_size); 2221 header.rgd_offset = cpu_to_le64(header.rgd_offset); 2222 header.gd_offset = cpu_to_le64(header.gd_offset); 2223 header.grain_offset = cpu_to_le64(header.grain_offset); 2224 header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm); 2225 2226 header.check_bytes[0] = 0xa; 2227 header.check_bytes[1] = 0x20; 2228 header.check_bytes[2] = 0xd; 2229 header.check_bytes[3] = 0xa; 2230 2231 /* write all the data */ 2232 ret = blk_pwrite(blk, 0, sizeof(magic), &magic, 0); 2233 if (ret < 0) { 2234 error_setg(errp, QERR_IO_ERROR); 2235 goto exit; 2236 } 2237 ret = blk_pwrite(blk, sizeof(magic), sizeof(header), &header, 0); 2238 if (ret < 0) { 2239 error_setg(errp, QERR_IO_ERROR); 2240 goto exit; 2241 } 2242 2243 ret = blk_truncate(blk, le64_to_cpu(header.grain_offset) << 9, false, 2244 PREALLOC_MODE_OFF, 0, errp); 2245 if (ret < 0) { 2246 goto exit; 2247 } 2248 2249 /* write grain directory */ 2250 gd_buf_size = gd_sectors * BDRV_SECTOR_SIZE; 2251 gd_buf = g_malloc0(gd_buf_size); 2252 for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_sectors; 2253 i < gt_count; i++, tmp += gt_size) { 2254 gd_buf[i] = cpu_to_le32(tmp); 2255 } 2256 ret = blk_pwrite(blk, le64_to_cpu(header.rgd_offset) * BDRV_SECTOR_SIZE, 2257 gd_buf_size, gd_buf, 0); 2258 if (ret < 0) { 2259 error_setg(errp, QERR_IO_ERROR); 2260 goto exit; 2261 } 2262 2263 /* write backup grain directory */ 2264 for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_sectors; 2265 i < gt_count; i++, tmp += gt_size) { 2266 gd_buf[i] = cpu_to_le32(tmp); 2267 } 2268 ret = blk_pwrite(blk, le64_to_cpu(header.gd_offset) * BDRV_SECTOR_SIZE, 2269 gd_buf_size, gd_buf, 0); 2270 if (ret < 0) { 2271 error_setg(errp, QERR_IO_ERROR); 2272 } 2273 2274 ret = 0; 2275 exit: 2276 g_free(gd_buf); 2277 return ret; 2278 } 2279 2280 static int coroutine_fn GRAPH_RDLOCK 2281 vmdk_create_extent(const char *filename, int64_t filesize, bool flat, 2282 bool compress, bool zeroed_grain, BlockBackend **pbb, 2283 QemuOpts *opts, Error **errp) 2284 { 2285 int ret; 2286 BlockBackend *blk = NULL; 2287 2288 ret = bdrv_co_create_file(filename, opts, errp); 2289 if (ret < 0) { 2290 goto exit; 2291 } 2292 2293 blk = blk_co_new_open(filename, NULL, NULL, 2294 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, 2295 errp); 2296 if (blk == NULL) { 2297 ret = -EIO; 2298 goto exit; 2299 } 2300 2301 blk_set_allow_write_beyond_eof(blk, true); 2302 2303 ret = vmdk_init_extent(blk, filesize, flat, compress, zeroed_grain, errp); 2304 exit: 2305 if (blk) { 2306 if (pbb) { 2307 *pbb = blk; 2308 } else { 2309 blk_co_unref(blk); 2310 blk = NULL; 2311 } 2312 } 2313 return ret; 2314 } 2315 2316 static int filename_decompose(const char *filename, char *path, char *prefix, 2317 char *postfix, size_t buf_len, Error **errp) 2318 { 2319 const char *p, *q; 2320 2321 if (filename == NULL || !strlen(filename)) { 2322 error_setg(errp, "No filename provided"); 2323 return VMDK_ERROR; 2324 } 2325 p = strrchr(filename, '/'); 2326 if (p == NULL) { 2327 p = strrchr(filename, '\\'); 2328 } 2329 if (p == NULL) { 2330 p = strrchr(filename, ':'); 2331 } 2332 if (p != NULL) { 2333 p++; 2334 if (p - filename >= buf_len) { 2335 return VMDK_ERROR; 2336 } 2337 pstrcpy(path, p - filename + 1, filename); 2338 } else { 2339 p = filename; 2340 path[0] = '\0'; 2341 } 2342 q = strrchr(p, '.'); 2343 if (q == NULL) { 2344 pstrcpy(prefix, buf_len, p); 2345 postfix[0] = '\0'; 2346 } else { 2347 if (q - p >= buf_len) { 2348 return VMDK_ERROR; 2349 } 2350 pstrcpy(prefix, q - p + 1, p); 2351 pstrcpy(postfix, buf_len, q); 2352 } 2353 return VMDK_OK; 2354 } 2355 2356 /* 2357 * idx == 0: get or create the descriptor file (also the image file if in a 2358 * non-split format. 2359 * idx >= 1: get the n-th extent if in a split subformat 2360 */ 2361 typedef BlockBackend * coroutine_fn /* GRAPH_RDLOCK */ 2362 (*vmdk_create_extent_fn)(int64_t size, int idx, bool flat, bool split, 2363 bool compress, bool zeroed_grain, void *opaque, 2364 Error **errp); 2365 2366 static void vmdk_desc_add_extent(GString *desc, 2367 const char *extent_line_fmt, 2368 int64_t size, const char *filename) 2369 { 2370 char *basename = g_path_get_basename(filename); 2371 2372 g_string_append_printf(desc, extent_line_fmt, 2373 DIV_ROUND_UP(size, BDRV_SECTOR_SIZE), basename); 2374 g_free(basename); 2375 } 2376 2377 static int coroutine_fn GRAPH_RDLOCK 2378 vmdk_co_do_create(int64_t size, 2379 BlockdevVmdkSubformat subformat, 2380 BlockdevVmdkAdapterType adapter_type, 2381 const char *backing_file, 2382 const char *hw_version, 2383 const char *toolsversion, 2384 bool compat6, 2385 bool zeroed_grain, 2386 vmdk_create_extent_fn extent_fn, 2387 void *opaque, 2388 Error **errp) 2389 { 2390 int extent_idx; 2391 BlockBackend *blk = NULL; 2392 BlockBackend *extent_blk; 2393 Error *local_err = NULL; 2394 char *desc = NULL; 2395 int ret = 0; 2396 bool flat, split, compress; 2397 GString *ext_desc_lines; 2398 const int64_t split_size = 0x80000000; /* VMDK has constant split size */ 2399 int64_t extent_size; 2400 int64_t created_size = 0; 2401 const char *extent_line_fmt; 2402 char *parent_desc_line = g_malloc0(BUF_SIZE); 2403 uint32_t parent_cid = 0xffffffff; 2404 uint32_t number_heads = 16; 2405 uint32_t desc_offset = 0, desc_len; 2406 const char desc_template[] = 2407 "# Disk DescriptorFile\n" 2408 "version=1\n" 2409 "CID=%" PRIx32 "\n" 2410 "parentCID=%" PRIx32 "\n" 2411 "createType=\"%s\"\n" 2412 "%s" 2413 "\n" 2414 "# Extent description\n" 2415 "%s" 2416 "\n" 2417 "# The Disk Data Base\n" 2418 "#DDB\n" 2419 "\n" 2420 "ddb.virtualHWVersion = \"%s\"\n" 2421 "ddb.geometry.cylinders = \"%" PRId64 "\"\n" 2422 "ddb.geometry.heads = \"%" PRIu32 "\"\n" 2423 "ddb.geometry.sectors = \"63\"\n" 2424 "ddb.adapterType = \"%s\"\n" 2425 "ddb.toolsVersion = \"%s\"\n"; 2426 2427 ext_desc_lines = g_string_new(NULL); 2428 2429 /* Read out options */ 2430 if (compat6) { 2431 if (hw_version) { 2432 error_setg(errp, 2433 "compat6 cannot be enabled with hwversion set"); 2434 ret = -EINVAL; 2435 goto exit; 2436 } 2437 hw_version = "6"; 2438 } 2439 if (!hw_version) { 2440 hw_version = "4"; 2441 } 2442 if (!toolsversion) { 2443 toolsversion = "2147483647"; 2444 } 2445 2446 if (adapter_type != BLOCKDEV_VMDK_ADAPTER_TYPE_IDE) { 2447 /* that's the number of heads with which vmware operates when 2448 creating, exporting, etc. vmdk files with a non-ide adapter type */ 2449 number_heads = 255; 2450 } 2451 split = (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTFLAT) || 2452 (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTSPARSE); 2453 flat = (subformat == BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICFLAT) || 2454 (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTFLAT); 2455 compress = subformat == BLOCKDEV_VMDK_SUBFORMAT_STREAMOPTIMIZED; 2456 2457 if (flat) { 2458 extent_line_fmt = "RW %" PRId64 " FLAT \"%s\" 0\n"; 2459 } else { 2460 extent_line_fmt = "RW %" PRId64 " SPARSE \"%s\"\n"; 2461 } 2462 if (flat && backing_file) { 2463 error_setg(errp, "Flat image can't have backing file"); 2464 ret = -ENOTSUP; 2465 goto exit; 2466 } 2467 if (flat && zeroed_grain) { 2468 error_setg(errp, "Flat image can't enable zeroed grain"); 2469 ret = -ENOTSUP; 2470 goto exit; 2471 } 2472 2473 /* Create extents */ 2474 if (split) { 2475 extent_size = split_size; 2476 } else { 2477 extent_size = size; 2478 } 2479 if (!split && !flat) { 2480 created_size = extent_size; 2481 } else { 2482 created_size = 0; 2483 } 2484 /* Get the descriptor file BDS */ 2485 blk = extent_fn(created_size, 0, flat, split, compress, zeroed_grain, 2486 opaque, errp); 2487 if (!blk) { 2488 ret = -EIO; 2489 goto exit; 2490 } 2491 if (!split && !flat) { 2492 vmdk_desc_add_extent(ext_desc_lines, extent_line_fmt, created_size, 2493 blk_bs(blk)->filename); 2494 } 2495 2496 if (backing_file) { 2497 BlockBackend *backing; 2498 char *full_backing = 2499 bdrv_get_full_backing_filename_from_filename(blk_bs(blk)->filename, 2500 backing_file, 2501 &local_err); 2502 if (local_err) { 2503 error_propagate(errp, local_err); 2504 ret = -ENOENT; 2505 goto exit; 2506 } 2507 assert(full_backing); 2508 2509 backing = blk_co_new_open(full_backing, NULL, NULL, 2510 BDRV_O_NO_BACKING, errp); 2511 g_free(full_backing); 2512 if (backing == NULL) { 2513 ret = -EIO; 2514 goto exit; 2515 } 2516 if (strcmp(blk_bs(backing)->drv->format_name, "vmdk")) { 2517 error_setg(errp, "Invalid backing file format: %s. Must be vmdk", 2518 blk_bs(backing)->drv->format_name); 2519 blk_co_unref(backing); 2520 ret = -EINVAL; 2521 goto exit; 2522 } 2523 ret = vmdk_read_cid(blk_bs(backing), 0, &parent_cid); 2524 blk_co_unref(backing); 2525 if (ret) { 2526 error_setg(errp, "Failed to read parent CID"); 2527 goto exit; 2528 } 2529 snprintf(parent_desc_line, BUF_SIZE, 2530 "parentFileNameHint=\"%s\"", backing_file); 2531 } 2532 extent_idx = 1; 2533 while (created_size < size) { 2534 int64_t cur_size = MIN(size - created_size, extent_size); 2535 extent_blk = extent_fn(cur_size, extent_idx, flat, split, compress, 2536 zeroed_grain, opaque, errp); 2537 if (!extent_blk) { 2538 ret = -EINVAL; 2539 goto exit; 2540 } 2541 vmdk_desc_add_extent(ext_desc_lines, extent_line_fmt, cur_size, 2542 blk_bs(extent_blk)->filename); 2543 created_size += cur_size; 2544 extent_idx++; 2545 blk_co_unref(extent_blk); 2546 } 2547 2548 /* Check whether we got excess extents */ 2549 extent_blk = extent_fn(-1, extent_idx, flat, split, compress, zeroed_grain, 2550 opaque, NULL); 2551 if (extent_blk) { 2552 blk_co_unref(extent_blk); 2553 error_setg(errp, "List of extents contains unused extents"); 2554 ret = -EINVAL; 2555 goto exit; 2556 } 2557 2558 /* generate descriptor file */ 2559 desc = g_strdup_printf(desc_template, 2560 g_random_int(), 2561 parent_cid, 2562 BlockdevVmdkSubformat_str(subformat), 2563 parent_desc_line, 2564 ext_desc_lines->str, 2565 hw_version, 2566 size / 2567 (int64_t)(63 * number_heads * BDRV_SECTOR_SIZE), 2568 number_heads, 2569 BlockdevVmdkAdapterType_str(adapter_type), 2570 toolsversion); 2571 desc_len = strlen(desc); 2572 /* the descriptor offset = 0x200 */ 2573 if (!split && !flat) { 2574 desc_offset = 0x200; 2575 } 2576 2577 ret = blk_co_pwrite(blk, desc_offset, desc_len, desc, 0); 2578 if (ret < 0) { 2579 error_setg_errno(errp, -ret, "Could not write description"); 2580 goto exit; 2581 } 2582 /* bdrv_pwrite write padding zeros to align to sector, we don't need that 2583 * for description file */ 2584 if (desc_offset == 0) { 2585 ret = blk_co_truncate(blk, desc_len, false, PREALLOC_MODE_OFF, 0, errp); 2586 if (ret < 0) { 2587 goto exit; 2588 } 2589 } 2590 ret = 0; 2591 exit: 2592 if (blk) { 2593 blk_co_unref(blk); 2594 } 2595 g_free(desc); 2596 g_free(parent_desc_line); 2597 g_string_free(ext_desc_lines, true); 2598 return ret; 2599 } 2600 2601 typedef struct { 2602 char *path; 2603 char *prefix; 2604 char *postfix; 2605 QemuOpts *opts; 2606 } VMDKCreateOptsData; 2607 2608 static BlockBackend * coroutine_fn GRAPH_RDLOCK 2609 vmdk_co_create_opts_cb(int64_t size, int idx, bool flat, bool split, 2610 bool compress, bool zeroed_grain, void *opaque, 2611 Error **errp) 2612 { 2613 BlockBackend *blk = NULL; 2614 BlockDriverState *bs = NULL; 2615 VMDKCreateOptsData *data = opaque; 2616 char *ext_filename = NULL; 2617 char *rel_filename = NULL; 2618 2619 /* We're done, don't create excess extents. */ 2620 if (size == -1) { 2621 assert(errp == NULL); 2622 return NULL; 2623 } 2624 2625 if (idx == 0) { 2626 rel_filename = g_strdup_printf("%s%s", data->prefix, data->postfix); 2627 } else if (split) { 2628 rel_filename = g_strdup_printf("%s-%c%03d%s", 2629 data->prefix, 2630 flat ? 'f' : 's', idx, data->postfix); 2631 } else { 2632 assert(idx == 1); 2633 rel_filename = g_strdup_printf("%s-flat%s", data->prefix, data->postfix); 2634 } 2635 2636 ext_filename = g_strdup_printf("%s%s", data->path, rel_filename); 2637 g_free(rel_filename); 2638 2639 if (vmdk_create_extent(ext_filename, size, 2640 flat, compress, zeroed_grain, &blk, data->opts, 2641 errp)) { 2642 goto exit; 2643 } 2644 bdrv_co_unref(bs); 2645 exit: 2646 g_free(ext_filename); 2647 return blk; 2648 } 2649 2650 static int coroutine_fn GRAPH_RDLOCK 2651 vmdk_co_create_opts(BlockDriver *drv, const char *filename, 2652 QemuOpts *opts, Error **errp) 2653 { 2654 Error *local_err = NULL; 2655 char *desc = NULL; 2656 int64_t total_size = 0; 2657 char *adapter_type = NULL; 2658 BlockdevVmdkAdapterType adapter_type_enum; 2659 char *backing_file = NULL; 2660 char *hw_version = NULL; 2661 char *toolsversion = NULL; 2662 char *fmt = NULL; 2663 BlockdevVmdkSubformat subformat; 2664 int ret = 0; 2665 char *path = g_malloc0(PATH_MAX); 2666 char *prefix = g_malloc0(PATH_MAX); 2667 char *postfix = g_malloc0(PATH_MAX); 2668 char *desc_line = g_malloc0(BUF_SIZE); 2669 char *ext_filename = g_malloc0(PATH_MAX); 2670 char *desc_filename = g_malloc0(PATH_MAX); 2671 char *parent_desc_line = g_malloc0(BUF_SIZE); 2672 bool zeroed_grain; 2673 bool compat6; 2674 VMDKCreateOptsData data; 2675 char *backing_fmt = NULL; 2676 2677 backing_fmt = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FMT); 2678 if (backing_fmt && strcmp(backing_fmt, "vmdk") != 0) { 2679 error_setg(errp, "backing_file must be a vmdk image"); 2680 ret = -EINVAL; 2681 goto exit; 2682 } 2683 2684 if (filename_decompose(filename, path, prefix, postfix, PATH_MAX, errp)) { 2685 ret = -EINVAL; 2686 goto exit; 2687 } 2688 /* Read out options */ 2689 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 2690 BDRV_SECTOR_SIZE); 2691 adapter_type = qemu_opt_get_del(opts, BLOCK_OPT_ADAPTER_TYPE); 2692 backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE); 2693 hw_version = qemu_opt_get_del(opts, BLOCK_OPT_HWVERSION); 2694 toolsversion = qemu_opt_get_del(opts, BLOCK_OPT_TOOLSVERSION); 2695 compat6 = qemu_opt_get_bool_del(opts, BLOCK_OPT_COMPAT6, false); 2696 if (strcmp(hw_version, "undefined") == 0) { 2697 g_free(hw_version); 2698 hw_version = NULL; 2699 } 2700 fmt = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT); 2701 zeroed_grain = qemu_opt_get_bool_del(opts, BLOCK_OPT_ZEROED_GRAIN, false); 2702 2703 if (adapter_type) { 2704 adapter_type_enum = qapi_enum_parse(&BlockdevVmdkAdapterType_lookup, 2705 adapter_type, 2706 BLOCKDEV_VMDK_ADAPTER_TYPE_IDE, 2707 &local_err); 2708 if (local_err) { 2709 error_propagate(errp, local_err); 2710 ret = -EINVAL; 2711 goto exit; 2712 } 2713 } else { 2714 adapter_type_enum = BLOCKDEV_VMDK_ADAPTER_TYPE_IDE; 2715 } 2716 2717 if (!fmt) { 2718 /* Default format to monolithicSparse */ 2719 subformat = BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICSPARSE; 2720 } else { 2721 subformat = qapi_enum_parse(&BlockdevVmdkSubformat_lookup, 2722 fmt, 2723 BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICSPARSE, 2724 &local_err); 2725 if (local_err) { 2726 error_propagate(errp, local_err); 2727 ret = -EINVAL; 2728 goto exit; 2729 } 2730 } 2731 data = (VMDKCreateOptsData){ 2732 .prefix = prefix, 2733 .postfix = postfix, 2734 .path = path, 2735 .opts = opts, 2736 }; 2737 ret = vmdk_co_do_create(total_size, subformat, adapter_type_enum, 2738 backing_file, hw_version, toolsversion, compat6, 2739 zeroed_grain, vmdk_co_create_opts_cb, &data, errp); 2740 2741 exit: 2742 g_free(backing_fmt); 2743 g_free(adapter_type); 2744 g_free(backing_file); 2745 g_free(hw_version); 2746 g_free(toolsversion); 2747 g_free(fmt); 2748 g_free(desc); 2749 g_free(path); 2750 g_free(prefix); 2751 g_free(postfix); 2752 g_free(desc_line); 2753 g_free(ext_filename); 2754 g_free(desc_filename); 2755 g_free(parent_desc_line); 2756 return ret; 2757 } 2758 2759 static BlockBackend * coroutine_fn vmdk_co_create_cb(int64_t size, int idx, 2760 bool flat, bool split, 2761 bool compress, 2762 bool zeroed_grain, 2763 void *opaque, Error **errp) 2764 { 2765 int ret; 2766 BlockDriverState *bs; 2767 BlockBackend *blk; 2768 BlockdevCreateOptionsVmdk *opts = opaque; 2769 2770 if (idx == 0) { 2771 bs = bdrv_co_open_blockdev_ref(opts->file, errp); 2772 } else { 2773 int i; 2774 BlockdevRefList *list = opts->extents; 2775 for (i = 1; i < idx; i++) { 2776 if (!list || !list->next) { 2777 error_setg(errp, "Extent [%d] not specified", i); 2778 return NULL; 2779 } 2780 list = list->next; 2781 } 2782 if (!list) { 2783 error_setg(errp, "Extent [%d] not specified", idx - 1); 2784 return NULL; 2785 } 2786 bs = bdrv_co_open_blockdev_ref(list->value, errp); 2787 } 2788 if (!bs) { 2789 return NULL; 2790 } 2791 blk = blk_co_new_with_bs(bs, 2792 BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE | 2793 BLK_PERM_RESIZE, 2794 BLK_PERM_ALL, 2795 errp); 2796 if (!blk) { 2797 return NULL; 2798 } 2799 blk_set_allow_write_beyond_eof(blk, true); 2800 bdrv_co_unref(bs); 2801 2802 if (size != -1) { 2803 ret = vmdk_init_extent(blk, size, flat, compress, zeroed_grain, errp); 2804 if (ret) { 2805 blk_co_unref(blk); 2806 blk = NULL; 2807 } 2808 } 2809 return blk; 2810 } 2811 2812 static int coroutine_fn GRAPH_RDLOCK 2813 vmdk_co_create(BlockdevCreateOptions *create_options, Error **errp) 2814 { 2815 BlockdevCreateOptionsVmdk *opts; 2816 2817 opts = &create_options->u.vmdk; 2818 2819 /* Validate options */ 2820 if (!QEMU_IS_ALIGNED(opts->size, BDRV_SECTOR_SIZE)) { 2821 error_setg(errp, "Image size must be a multiple of 512 bytes"); 2822 return -EINVAL; 2823 } 2824 2825 return vmdk_co_do_create(opts->size, 2826 opts->subformat, 2827 opts->adapter_type, 2828 opts->backing_file, 2829 opts->hwversion, 2830 opts->toolsversion, 2831 false, 2832 opts->zeroed_grain, 2833 vmdk_co_create_cb, 2834 opts, errp); 2835 } 2836 2837 static void vmdk_close(BlockDriverState *bs) 2838 { 2839 BDRVVmdkState *s = bs->opaque; 2840 2841 vmdk_free_extents(bs); 2842 g_free(s->create_type); 2843 2844 migrate_del_blocker(s->migration_blocker); 2845 error_free(s->migration_blocker); 2846 } 2847 2848 static int64_t coroutine_fn GRAPH_RDLOCK 2849 vmdk_co_get_allocated_file_size(BlockDriverState *bs) 2850 { 2851 int i; 2852 int64_t ret = 0; 2853 int64_t r; 2854 BDRVVmdkState *s = bs->opaque; 2855 2856 ret = bdrv_co_get_allocated_file_size(bs->file->bs); 2857 if (ret < 0) { 2858 return ret; 2859 } 2860 for (i = 0; i < s->num_extents; i++) { 2861 if (s->extents[i].file == bs->file) { 2862 continue; 2863 } 2864 r = bdrv_co_get_allocated_file_size(s->extents[i].file->bs); 2865 if (r < 0) { 2866 return r; 2867 } 2868 ret += r; 2869 } 2870 return ret; 2871 } 2872 2873 static int vmdk_has_zero_init(BlockDriverState *bs) 2874 { 2875 int i; 2876 BDRVVmdkState *s = bs->opaque; 2877 2878 /* If has a flat extent and its underlying storage doesn't have zero init, 2879 * return 0. */ 2880 for (i = 0; i < s->num_extents; i++) { 2881 if (s->extents[i].flat) { 2882 if (!bdrv_has_zero_init(s->extents[i].file->bs)) { 2883 return 0; 2884 } 2885 } 2886 } 2887 return 1; 2888 } 2889 2890 static VmdkExtentInfo *vmdk_get_extent_info(VmdkExtent *extent) 2891 { 2892 VmdkExtentInfo *info = g_new0(VmdkExtentInfo, 1); 2893 2894 bdrv_refresh_filename(extent->file->bs); 2895 *info = (VmdkExtentInfo){ 2896 .filename = g_strdup(extent->file->bs->filename), 2897 .format = g_strdup(extent->type), 2898 .virtual_size = extent->sectors * BDRV_SECTOR_SIZE, 2899 .compressed = extent->compressed, 2900 .has_compressed = extent->compressed, 2901 .cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE, 2902 .has_cluster_size = !extent->flat, 2903 }; 2904 2905 return info; 2906 } 2907 2908 static int coroutine_fn GRAPH_RDLOCK 2909 vmdk_co_check(BlockDriverState *bs, BdrvCheckResult *result, BdrvCheckMode fix) 2910 { 2911 BDRVVmdkState *s = bs->opaque; 2912 VmdkExtent *extent = NULL; 2913 int64_t sector_num = 0; 2914 int64_t total_sectors = bdrv_nb_sectors(bs); 2915 int ret; 2916 uint64_t cluster_offset; 2917 2918 if (fix) { 2919 return -ENOTSUP; 2920 } 2921 2922 for (;;) { 2923 if (sector_num >= total_sectors) { 2924 return 0; 2925 } 2926 extent = find_extent(s, sector_num, extent); 2927 if (!extent) { 2928 fprintf(stderr, 2929 "ERROR: could not find extent for sector %" PRId64 "\n", 2930 sector_num); 2931 ret = -EINVAL; 2932 break; 2933 } 2934 ret = get_cluster_offset(bs, extent, NULL, 2935 sector_num << BDRV_SECTOR_BITS, 2936 false, &cluster_offset, 0, 0); 2937 if (ret == VMDK_ERROR) { 2938 fprintf(stderr, 2939 "ERROR: could not get cluster_offset for sector %" 2940 PRId64 "\n", sector_num); 2941 break; 2942 } 2943 if (ret == VMDK_OK) { 2944 int64_t extent_len = bdrv_getlength(extent->file->bs); 2945 if (extent_len < 0) { 2946 fprintf(stderr, 2947 "ERROR: could not get extent file length for sector %" 2948 PRId64 "\n", sector_num); 2949 ret = extent_len; 2950 break; 2951 } 2952 if (cluster_offset >= extent_len) { 2953 fprintf(stderr, 2954 "ERROR: cluster offset for sector %" 2955 PRId64 " points after EOF\n", sector_num); 2956 ret = -EINVAL; 2957 break; 2958 } 2959 } 2960 sector_num += extent->cluster_sectors; 2961 } 2962 2963 result->corruptions++; 2964 return ret; 2965 } 2966 2967 static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs, 2968 Error **errp) 2969 { 2970 int i; 2971 BDRVVmdkState *s = bs->opaque; 2972 ImageInfoSpecific *spec_info = g_new0(ImageInfoSpecific, 1); 2973 VmdkExtentInfoList **tail; 2974 2975 *spec_info = (ImageInfoSpecific){ 2976 .type = IMAGE_INFO_SPECIFIC_KIND_VMDK, 2977 .u = { 2978 .vmdk.data = g_new0(ImageInfoSpecificVmdk, 1), 2979 }, 2980 }; 2981 2982 *spec_info->u.vmdk.data = (ImageInfoSpecificVmdk) { 2983 .create_type = g_strdup(s->create_type), 2984 .cid = s->cid, 2985 .parent_cid = s->parent_cid, 2986 }; 2987 2988 tail = &spec_info->u.vmdk.data->extents; 2989 for (i = 0; i < s->num_extents; i++) { 2990 QAPI_LIST_APPEND(tail, vmdk_get_extent_info(&s->extents[i])); 2991 } 2992 2993 return spec_info; 2994 } 2995 2996 static bool vmdk_extents_type_eq(const VmdkExtent *a, const VmdkExtent *b) 2997 { 2998 return a->flat == b->flat && 2999 a->compressed == b->compressed && 3000 (a->flat || a->cluster_sectors == b->cluster_sectors); 3001 } 3002 3003 static int coroutine_fn 3004 vmdk_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 3005 { 3006 int i; 3007 BDRVVmdkState *s = bs->opaque; 3008 assert(s->num_extents); 3009 3010 /* See if we have multiple extents but they have different cases */ 3011 for (i = 1; i < s->num_extents; i++) { 3012 if (!vmdk_extents_type_eq(&s->extents[0], &s->extents[i])) { 3013 return -ENOTSUP; 3014 } 3015 } 3016 bdi->needs_compressed_writes = s->extents[0].compressed; 3017 if (!s->extents[0].flat) { 3018 bdi->cluster_size = s->extents[0].cluster_sectors << BDRV_SECTOR_BITS; 3019 } 3020 return 0; 3021 } 3022 3023 static void vmdk_gather_child_options(BlockDriverState *bs, QDict *target, 3024 bool backing_overridden) 3025 { 3026 /* No children but file and backing can be explicitly specified (TODO) */ 3027 qdict_put(target, "file", 3028 qobject_ref(bs->file->bs->full_open_options)); 3029 3030 if (backing_overridden) { 3031 if (bs->backing) { 3032 qdict_put(target, "backing", 3033 qobject_ref(bs->backing->bs->full_open_options)); 3034 } else { 3035 qdict_put_null(target, "backing"); 3036 } 3037 } 3038 } 3039 3040 static QemuOptsList vmdk_create_opts = { 3041 .name = "vmdk-create-opts", 3042 .head = QTAILQ_HEAD_INITIALIZER(vmdk_create_opts.head), 3043 .desc = { 3044 { 3045 .name = BLOCK_OPT_SIZE, 3046 .type = QEMU_OPT_SIZE, 3047 .help = "Virtual disk size" 3048 }, 3049 { 3050 .name = BLOCK_OPT_ADAPTER_TYPE, 3051 .type = QEMU_OPT_STRING, 3052 .help = "Virtual adapter type, can be one of " 3053 "ide (default), lsilogic, buslogic or legacyESX" 3054 }, 3055 { 3056 .name = BLOCK_OPT_BACKING_FILE, 3057 .type = QEMU_OPT_STRING, 3058 .help = "File name of a base image" 3059 }, 3060 { 3061 .name = BLOCK_OPT_BACKING_FMT, 3062 .type = QEMU_OPT_STRING, 3063 .help = "Must be 'vmdk' if present", 3064 }, 3065 { 3066 .name = BLOCK_OPT_COMPAT6, 3067 .type = QEMU_OPT_BOOL, 3068 .help = "VMDK version 6 image", 3069 .def_value_str = "off" 3070 }, 3071 { 3072 .name = BLOCK_OPT_HWVERSION, 3073 .type = QEMU_OPT_STRING, 3074 .help = "VMDK hardware version", 3075 .def_value_str = "undefined" 3076 }, 3077 { 3078 .name = BLOCK_OPT_TOOLSVERSION, 3079 .type = QEMU_OPT_STRING, 3080 .help = "VMware guest tools version", 3081 }, 3082 { 3083 .name = BLOCK_OPT_SUBFMT, 3084 .type = QEMU_OPT_STRING, 3085 .help = 3086 "VMDK flat extent format, can be one of " 3087 "{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} " 3088 }, 3089 { 3090 .name = BLOCK_OPT_ZEROED_GRAIN, 3091 .type = QEMU_OPT_BOOL, 3092 .help = "Enable efficient zero writes " 3093 "using the zeroed-grain GTE feature" 3094 }, 3095 { /* end of list */ } 3096 } 3097 }; 3098 3099 static BlockDriver bdrv_vmdk = { 3100 .format_name = "vmdk", 3101 .instance_size = sizeof(BDRVVmdkState), 3102 .bdrv_probe = vmdk_probe, 3103 .bdrv_open = vmdk_open, 3104 .bdrv_co_check = vmdk_co_check, 3105 .bdrv_reopen_prepare = vmdk_reopen_prepare, 3106 .bdrv_reopen_commit = vmdk_reopen_commit, 3107 .bdrv_reopen_abort = vmdk_reopen_abort, 3108 .bdrv_child_perm = bdrv_default_perms, 3109 .bdrv_co_preadv = vmdk_co_preadv, 3110 .bdrv_co_pwritev = vmdk_co_pwritev, 3111 .bdrv_co_pwritev_compressed = vmdk_co_pwritev_compressed, 3112 .bdrv_co_pwrite_zeroes = vmdk_co_pwrite_zeroes, 3113 .bdrv_close = vmdk_close, 3114 .bdrv_co_create_opts = vmdk_co_create_opts, 3115 .bdrv_co_create = vmdk_co_create, 3116 .bdrv_co_block_status = vmdk_co_block_status, 3117 .bdrv_co_get_allocated_file_size = vmdk_co_get_allocated_file_size, 3118 .bdrv_has_zero_init = vmdk_has_zero_init, 3119 .bdrv_get_specific_info = vmdk_get_specific_info, 3120 .bdrv_refresh_limits = vmdk_refresh_limits, 3121 .bdrv_co_get_info = vmdk_co_get_info, 3122 .bdrv_gather_child_options = vmdk_gather_child_options, 3123 3124 .is_format = true, 3125 .supports_backing = true, 3126 .create_opts = &vmdk_create_opts, 3127 }; 3128 3129 static void bdrv_vmdk_init(void) 3130 { 3131 bdrv_register(&bdrv_vmdk); 3132 } 3133 3134 block_init(bdrv_vmdk_init); 3135