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 bdrv_graph_wrlock(); 276 for (i = 0; i < s->num_extents; i++) { 277 e = &s->extents[i]; 278 g_free(e->l1_table); 279 g_free(e->l2_cache); 280 g_free(e->l1_backup_table); 281 g_free(e->type); 282 if (e->file != bs->file) { 283 bdrv_unref_child(bs, e->file); 284 } 285 } 286 bdrv_graph_wrunlock(); 287 288 g_free(s->extents); 289 } 290 291 static void vmdk_free_last_extent(BlockDriverState *bs) 292 { 293 BDRVVmdkState *s = bs->opaque; 294 295 if (s->num_extents == 0) { 296 return; 297 } 298 s->num_extents--; 299 s->extents = g_renew(VmdkExtent, s->extents, s->num_extents); 300 } 301 302 /* Return -ve errno, or 0 on success and write CID into *pcid. */ 303 static int GRAPH_RDLOCK 304 vmdk_read_cid(BlockDriverState *bs, int parent, uint32_t *pcid) 305 { 306 char *desc; 307 uint32_t cid; 308 const char *p_name, *cid_str; 309 size_t cid_str_size; 310 BDRVVmdkState *s = bs->opaque; 311 int ret; 312 313 desc = g_malloc0(DESC_SIZE); 314 ret = bdrv_pread(bs->file, s->desc_offset, DESC_SIZE, desc, 0); 315 if (ret < 0) { 316 goto out; 317 } 318 319 if (parent) { 320 cid_str = "parentCID"; 321 cid_str_size = sizeof("parentCID"); 322 } else { 323 cid_str = "CID"; 324 cid_str_size = sizeof("CID"); 325 } 326 327 desc[DESC_SIZE - 1] = '\0'; 328 p_name = strstr(desc, cid_str); 329 if (p_name == NULL) { 330 ret = -EINVAL; 331 goto out; 332 } 333 p_name += cid_str_size; 334 if (sscanf(p_name, "%" SCNx32, &cid) != 1) { 335 ret = -EINVAL; 336 goto out; 337 } 338 *pcid = cid; 339 ret = 0; 340 341 out: 342 g_free(desc); 343 return ret; 344 } 345 346 static int coroutine_fn GRAPH_RDLOCK 347 vmdk_write_cid(BlockDriverState *bs, uint32_t cid) 348 { 349 char *desc, *tmp_desc; 350 char *p_name, *tmp_str; 351 BDRVVmdkState *s = bs->opaque; 352 int ret = 0; 353 354 size_t desc_buf_size; 355 356 if (s->desc_offset == 0) { 357 desc_buf_size = bdrv_getlength(bs->file->bs); 358 if (desc_buf_size > 16ULL << 20) { 359 error_report("VMDK description file too big"); 360 return -EFBIG; 361 } 362 } else { 363 desc_buf_size = DESC_SIZE; 364 } 365 366 desc = g_malloc0(desc_buf_size); 367 tmp_desc = g_malloc0(desc_buf_size); 368 ret = bdrv_co_pread(bs->file, s->desc_offset, desc_buf_size, desc, 0); 369 if (ret < 0) { 370 goto out; 371 } 372 373 desc[desc_buf_size - 1] = '\0'; 374 tmp_str = strstr(desc, "parentCID"); 375 if (tmp_str == NULL) { 376 ret = -EINVAL; 377 goto out; 378 } 379 380 pstrcpy(tmp_desc, desc_buf_size, tmp_str); 381 p_name = strstr(desc, "CID"); 382 if (p_name != NULL) { 383 p_name += sizeof("CID"); 384 snprintf(p_name, desc_buf_size - (p_name - desc), "%" PRIx32 "\n", cid); 385 pstrcat(desc, desc_buf_size, tmp_desc); 386 } 387 388 ret = bdrv_co_pwrite_sync(bs->file, s->desc_offset, desc_buf_size, desc, 0); 389 390 out: 391 g_free(desc); 392 g_free(tmp_desc); 393 return ret; 394 } 395 396 static int coroutine_fn GRAPH_RDLOCK vmdk_is_cid_valid(BlockDriverState *bs) 397 { 398 BDRVVmdkState *s = bs->opaque; 399 uint32_t cur_pcid; 400 401 if (!s->cid_checked && bs->backing) { 402 BlockDriverState *p_bs = bs->backing->bs; 403 404 if (strcmp(p_bs->drv->format_name, "vmdk")) { 405 /* Backing file is not in vmdk format, so it does not have 406 * a CID, which makes the overlay's parent CID invalid */ 407 return 0; 408 } 409 410 if (vmdk_read_cid(p_bs, 0, &cur_pcid) != 0) { 411 /* read failure: report as not valid */ 412 return 0; 413 } 414 if (s->parent_cid != cur_pcid) { 415 /* CID not valid */ 416 return 0; 417 } 418 } 419 s->cid_checked = true; 420 /* CID valid */ 421 return 1; 422 } 423 424 static int vmdk_reopen_prepare(BDRVReopenState *state, 425 BlockReopenQueue *queue, Error **errp) 426 { 427 BDRVVmdkState *s; 428 BDRVVmdkReopenState *rs; 429 int i; 430 431 GLOBAL_STATE_CODE(); 432 GRAPH_RDLOCK_GUARD_MAINLOOP(); 433 434 assert(state != NULL); 435 assert(state->bs != NULL); 436 assert(state->opaque == NULL); 437 438 s = state->bs->opaque; 439 440 rs = g_new0(BDRVVmdkReopenState, 1); 441 state->opaque = rs; 442 443 /* 444 * Check whether there are any extents stored in bs->file; if bs->file 445 * changes, we will need to update their .file pointers to follow suit 446 */ 447 rs->extents_using_bs_file = g_new(bool, s->num_extents); 448 for (i = 0; i < s->num_extents; i++) { 449 rs->extents_using_bs_file[i] = s->extents[i].file == state->bs->file; 450 } 451 452 return 0; 453 } 454 455 static void vmdk_reopen_clean(BDRVReopenState *state) 456 { 457 BDRVVmdkReopenState *rs = state->opaque; 458 459 g_free(rs->extents_using_bs_file); 460 g_free(rs); 461 state->opaque = NULL; 462 } 463 464 static void vmdk_reopen_commit(BDRVReopenState *state) 465 { 466 BDRVVmdkState *s = state->bs->opaque; 467 BDRVVmdkReopenState *rs = state->opaque; 468 int i; 469 470 GLOBAL_STATE_CODE(); 471 GRAPH_RDLOCK_GUARD_MAINLOOP(); 472 473 for (i = 0; i < s->num_extents; i++) { 474 if (rs->extents_using_bs_file[i]) { 475 s->extents[i].file = state->bs->file; 476 } 477 } 478 479 vmdk_reopen_clean(state); 480 } 481 482 static void vmdk_reopen_abort(BDRVReopenState *state) 483 { 484 vmdk_reopen_clean(state); 485 } 486 487 static int GRAPH_RDLOCK vmdk_parent_open(BlockDriverState *bs) 488 { 489 char *p_name; 490 char *desc; 491 BDRVVmdkState *s = bs->opaque; 492 int ret; 493 494 desc = g_malloc0(DESC_SIZE + 1); 495 ret = bdrv_pread(bs->file, s->desc_offset, DESC_SIZE, desc, 0); 496 if (ret < 0) { 497 goto out; 498 } 499 500 p_name = strstr(desc, "parentFileNameHint"); 501 if (p_name != NULL) { 502 char *end_name; 503 504 p_name += sizeof("parentFileNameHint") + 1; 505 end_name = strchr(p_name, '\"'); 506 if (end_name == NULL) { 507 ret = -EINVAL; 508 goto out; 509 } 510 if ((end_name - p_name) > sizeof(bs->auto_backing_file) - 1) { 511 ret = -EINVAL; 512 goto out; 513 } 514 515 pstrcpy(bs->auto_backing_file, end_name - p_name + 1, p_name); 516 pstrcpy(bs->backing_file, sizeof(bs->backing_file), 517 bs->auto_backing_file); 518 pstrcpy(bs->backing_format, sizeof(bs->backing_format), 519 "vmdk"); 520 } 521 522 out: 523 g_free(desc); 524 return ret; 525 } 526 527 /* Create and append extent to the extent array. Return the added VmdkExtent 528 * address. return NULL if allocation failed. */ 529 static int vmdk_add_extent(BlockDriverState *bs, 530 BdrvChild *file, bool flat, int64_t sectors, 531 int64_t l1_offset, int64_t l1_backup_offset, 532 uint32_t l1_size, 533 int l2_size, uint64_t cluster_sectors, 534 VmdkExtent **new_extent, 535 Error **errp) 536 { 537 VmdkExtent *extent; 538 BDRVVmdkState *s = bs->opaque; 539 int64_t nb_sectors; 540 541 if (cluster_sectors > 0x200000) { 542 /* 0x200000 * 512Bytes = 1GB for one cluster is unrealistic */ 543 error_setg(errp, "Invalid granularity, image may be corrupt"); 544 return -EFBIG; 545 } 546 if (l1_size > 32 * 1024 * 1024) { 547 /* 548 * Although with big capacity and small l1_entry_sectors, we can get a 549 * big l1_size, we don't want unbounded value to allocate the table. 550 * Limit it to 32M, which is enough to store: 551 * 8TB - for both VMDK3 & VMDK4 with 552 * minimal cluster size: 512B 553 * minimal L2 table size: 512 entries 554 * 8 TB is still more than the maximal value supported for 555 * VMDK3 & VMDK4 which is 2TB. 556 * 64TB - for "ESXi seSparse Extent" 557 * minimal cluster size: 512B (default is 4KB) 558 * L2 table size: 4096 entries (const). 559 * 64TB is more than the maximal value supported for 560 * seSparse VMDKs (which is slightly less than 64TB) 561 */ 562 error_setg(errp, "L1 size too big"); 563 return -EFBIG; 564 } 565 566 nb_sectors = bdrv_nb_sectors(file->bs); 567 if (nb_sectors < 0) { 568 return nb_sectors; 569 } 570 571 s->extents = g_renew(VmdkExtent, s->extents, s->num_extents + 1); 572 extent = &s->extents[s->num_extents]; 573 s->num_extents++; 574 575 memset(extent, 0, sizeof(VmdkExtent)); 576 extent->file = file; 577 extent->flat = flat; 578 extent->sectors = sectors; 579 extent->l1_table_offset = l1_offset; 580 extent->l1_backup_table_offset = l1_backup_offset; 581 extent->l1_size = l1_size; 582 extent->l1_entry_sectors = l2_size * cluster_sectors; 583 extent->l2_size = l2_size; 584 extent->cluster_sectors = flat ? sectors : cluster_sectors; 585 extent->next_cluster_sector = ROUND_UP(nb_sectors, cluster_sectors); 586 extent->entry_size = sizeof(uint32_t); 587 588 if (s->num_extents > 1) { 589 extent->end_sector = (*(extent - 1)).end_sector + extent->sectors; 590 } else { 591 extent->end_sector = extent->sectors; 592 } 593 bs->total_sectors = extent->end_sector; 594 if (new_extent) { 595 *new_extent = extent; 596 } 597 return 0; 598 } 599 600 static int GRAPH_RDLOCK 601 vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent, Error **errp) 602 { 603 int ret; 604 size_t l1_size; 605 int i; 606 607 /* read the L1 table */ 608 l1_size = extent->l1_size * extent->entry_size; 609 extent->l1_table = g_try_malloc(l1_size); 610 if (l1_size && extent->l1_table == NULL) { 611 return -ENOMEM; 612 } 613 614 ret = bdrv_pread(extent->file, extent->l1_table_offset, l1_size, 615 extent->l1_table, 0); 616 if (ret < 0) { 617 bdrv_refresh_filename(extent->file->bs); 618 error_setg_errno(errp, -ret, 619 "Could not read l1 table from extent '%s'", 620 extent->file->bs->filename); 621 goto fail_l1; 622 } 623 for (i = 0; i < extent->l1_size; i++) { 624 if (extent->entry_size == sizeof(uint64_t)) { 625 le64_to_cpus((uint64_t *)extent->l1_table + i); 626 } else { 627 assert(extent->entry_size == sizeof(uint32_t)); 628 le32_to_cpus((uint32_t *)extent->l1_table + i); 629 } 630 } 631 632 if (extent->l1_backup_table_offset) { 633 assert(!extent->sesparse); 634 extent->l1_backup_table = g_try_malloc(l1_size); 635 if (l1_size && extent->l1_backup_table == NULL) { 636 ret = -ENOMEM; 637 goto fail_l1; 638 } 639 ret = bdrv_pread(extent->file, extent->l1_backup_table_offset, 640 l1_size, extent->l1_backup_table, 0); 641 if (ret < 0) { 642 bdrv_refresh_filename(extent->file->bs); 643 error_setg_errno(errp, -ret, 644 "Could not read l1 backup table from extent '%s'", 645 extent->file->bs->filename); 646 goto fail_l1b; 647 } 648 for (i = 0; i < extent->l1_size; i++) { 649 le32_to_cpus(&extent->l1_backup_table[i]); 650 } 651 } 652 653 extent->l2_cache = 654 g_malloc(extent->entry_size * extent->l2_size * L2_CACHE_SIZE); 655 return 0; 656 fail_l1b: 657 g_free(extent->l1_backup_table); 658 fail_l1: 659 g_free(extent->l1_table); 660 return ret; 661 } 662 663 static int GRAPH_RDLOCK 664 vmdk_open_vmfs_sparse(BlockDriverState *bs, BdrvChild *file, int flags, 665 Error **errp) 666 { 667 int ret; 668 uint32_t magic; 669 VMDK3Header header; 670 VmdkExtent *extent = NULL; 671 672 ret = bdrv_pread(file, sizeof(magic), sizeof(header), &header, 0); 673 if (ret < 0) { 674 bdrv_refresh_filename(file->bs); 675 error_setg_errno(errp, -ret, 676 "Could not read header from file '%s'", 677 file->bs->filename); 678 return ret; 679 } 680 ret = vmdk_add_extent(bs, file, false, 681 le32_to_cpu(header.disk_sectors), 682 (int64_t)le32_to_cpu(header.l1dir_offset) << 9, 683 0, 684 le32_to_cpu(header.l1dir_size), 685 4096, 686 le32_to_cpu(header.granularity), 687 &extent, 688 errp); 689 if (ret < 0) { 690 return ret; 691 } 692 ret = vmdk_init_tables(bs, extent, errp); 693 if (ret) { 694 /* free extent allocated by vmdk_add_extent */ 695 vmdk_free_last_extent(bs); 696 } 697 return ret; 698 } 699 700 #define SESPARSE_CONST_HEADER_MAGIC UINT64_C(0x00000000cafebabe) 701 #define SESPARSE_VOLATILE_HEADER_MAGIC UINT64_C(0x00000000cafecafe) 702 703 /* Strict checks - format not officially documented */ 704 static int check_se_sparse_const_header(VMDKSESparseConstHeader *header, 705 Error **errp) 706 { 707 header->magic = le64_to_cpu(header->magic); 708 header->version = le64_to_cpu(header->version); 709 header->grain_size = le64_to_cpu(header->grain_size); 710 header->grain_table_size = le64_to_cpu(header->grain_table_size); 711 header->flags = le64_to_cpu(header->flags); 712 header->reserved1 = le64_to_cpu(header->reserved1); 713 header->reserved2 = le64_to_cpu(header->reserved2); 714 header->reserved3 = le64_to_cpu(header->reserved3); 715 header->reserved4 = le64_to_cpu(header->reserved4); 716 717 header->volatile_header_offset = 718 le64_to_cpu(header->volatile_header_offset); 719 header->volatile_header_size = le64_to_cpu(header->volatile_header_size); 720 721 header->journal_header_offset = le64_to_cpu(header->journal_header_offset); 722 header->journal_header_size = le64_to_cpu(header->journal_header_size); 723 724 header->journal_offset = le64_to_cpu(header->journal_offset); 725 header->journal_size = le64_to_cpu(header->journal_size); 726 727 header->grain_dir_offset = le64_to_cpu(header->grain_dir_offset); 728 header->grain_dir_size = le64_to_cpu(header->grain_dir_size); 729 730 header->grain_tables_offset = le64_to_cpu(header->grain_tables_offset); 731 header->grain_tables_size = le64_to_cpu(header->grain_tables_size); 732 733 header->free_bitmap_offset = le64_to_cpu(header->free_bitmap_offset); 734 header->free_bitmap_size = le64_to_cpu(header->free_bitmap_size); 735 736 header->backmap_offset = le64_to_cpu(header->backmap_offset); 737 header->backmap_size = le64_to_cpu(header->backmap_size); 738 739 header->grains_offset = le64_to_cpu(header->grains_offset); 740 header->grains_size = le64_to_cpu(header->grains_size); 741 742 if (header->magic != SESPARSE_CONST_HEADER_MAGIC) { 743 error_setg(errp, "Bad const header magic: 0x%016" PRIx64, 744 header->magic); 745 return -EINVAL; 746 } 747 748 if (header->version != 0x0000000200000001) { 749 error_setg(errp, "Unsupported version: 0x%016" PRIx64, 750 header->version); 751 return -ENOTSUP; 752 } 753 754 if (header->grain_size != 8) { 755 error_setg(errp, "Unsupported grain size: %" PRIu64, 756 header->grain_size); 757 return -ENOTSUP; 758 } 759 760 if (header->grain_table_size != 64) { 761 error_setg(errp, "Unsupported grain table size: %" PRIu64, 762 header->grain_table_size); 763 return -ENOTSUP; 764 } 765 766 if (header->flags != 0) { 767 error_setg(errp, "Unsupported flags: 0x%016" PRIx64, 768 header->flags); 769 return -ENOTSUP; 770 } 771 772 if (header->reserved1 != 0 || header->reserved2 != 0 || 773 header->reserved3 != 0 || header->reserved4 != 0) { 774 error_setg(errp, "Unsupported reserved bits:" 775 " 0x%016" PRIx64 " 0x%016" PRIx64 776 " 0x%016" PRIx64 " 0x%016" PRIx64, 777 header->reserved1, header->reserved2, 778 header->reserved3, header->reserved4); 779 return -ENOTSUP; 780 } 781 782 /* check that padding is 0 */ 783 if (!buffer_is_zero(header->pad, sizeof(header->pad))) { 784 error_setg(errp, "Unsupported non-zero const header padding"); 785 return -ENOTSUP; 786 } 787 788 return 0; 789 } 790 791 static int check_se_sparse_volatile_header(VMDKSESparseVolatileHeader *header, 792 Error **errp) 793 { 794 header->magic = le64_to_cpu(header->magic); 795 header->free_gt_number = le64_to_cpu(header->free_gt_number); 796 header->next_txn_seq_number = le64_to_cpu(header->next_txn_seq_number); 797 header->replay_journal = le64_to_cpu(header->replay_journal); 798 799 if (header->magic != SESPARSE_VOLATILE_HEADER_MAGIC) { 800 error_setg(errp, "Bad volatile header magic: 0x%016" PRIx64, 801 header->magic); 802 return -EINVAL; 803 } 804 805 if (header->replay_journal) { 806 error_setg(errp, "Image is dirty, Replaying journal not supported"); 807 return -ENOTSUP; 808 } 809 810 /* check that padding is 0 */ 811 if (!buffer_is_zero(header->pad, sizeof(header->pad))) { 812 error_setg(errp, "Unsupported non-zero volatile header padding"); 813 return -ENOTSUP; 814 } 815 816 return 0; 817 } 818 819 static int GRAPH_RDLOCK 820 vmdk_open_se_sparse(BlockDriverState *bs, BdrvChild *file, int flags, 821 Error **errp) 822 { 823 int ret; 824 VMDKSESparseConstHeader const_header; 825 VMDKSESparseVolatileHeader volatile_header; 826 VmdkExtent *extent = NULL; 827 828 ret = bdrv_apply_auto_read_only(bs, 829 "No write support for seSparse images available", errp); 830 if (ret < 0) { 831 return ret; 832 } 833 834 assert(sizeof(const_header) == SECTOR_SIZE); 835 836 ret = bdrv_pread(file, 0, sizeof(const_header), &const_header, 0); 837 if (ret < 0) { 838 bdrv_refresh_filename(file->bs); 839 error_setg_errno(errp, -ret, 840 "Could not read const header from file '%s'", 841 file->bs->filename); 842 return ret; 843 } 844 845 /* check const header */ 846 ret = check_se_sparse_const_header(&const_header, errp); 847 if (ret < 0) { 848 return ret; 849 } 850 851 assert(sizeof(volatile_header) == SECTOR_SIZE); 852 853 ret = bdrv_pread(file, const_header.volatile_header_offset * SECTOR_SIZE, 854 sizeof(volatile_header), &volatile_header, 0); 855 if (ret < 0) { 856 bdrv_refresh_filename(file->bs); 857 error_setg_errno(errp, -ret, 858 "Could not read volatile header from file '%s'", 859 file->bs->filename); 860 return ret; 861 } 862 863 /* check volatile header */ 864 ret = check_se_sparse_volatile_header(&volatile_header, errp); 865 if (ret < 0) { 866 return ret; 867 } 868 869 ret = vmdk_add_extent(bs, file, false, 870 const_header.capacity, 871 const_header.grain_dir_offset * SECTOR_SIZE, 872 0, 873 const_header.grain_dir_size * 874 SECTOR_SIZE / sizeof(uint64_t), 875 const_header.grain_table_size * 876 SECTOR_SIZE / sizeof(uint64_t), 877 const_header.grain_size, 878 &extent, 879 errp); 880 if (ret < 0) { 881 return ret; 882 } 883 884 extent->sesparse = true; 885 extent->sesparse_l2_tables_offset = const_header.grain_tables_offset; 886 extent->sesparse_clusters_offset = const_header.grains_offset; 887 extent->entry_size = sizeof(uint64_t); 888 889 ret = vmdk_init_tables(bs, extent, errp); 890 if (ret) { 891 /* free extent allocated by vmdk_add_extent */ 892 vmdk_free_last_extent(bs); 893 } 894 895 return ret; 896 } 897 898 static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf, 899 QDict *options, Error **errp); 900 901 static char *vmdk_read_desc(BdrvChild *file, uint64_t desc_offset, Error **errp) 902 { 903 int64_t size; 904 char *buf; 905 int ret; 906 907 size = bdrv_getlength(file->bs); 908 if (size < 0) { 909 error_setg_errno(errp, -size, "Could not access file"); 910 return NULL; 911 } 912 913 if (size < 4) { 914 /* Both descriptor file and sparse image must be much larger than 4 915 * bytes, also callers of vmdk_read_desc want to compare the first 4 916 * bytes with VMDK4_MAGIC, let's error out if less is read. */ 917 error_setg(errp, "File is too small, not a valid image"); 918 return NULL; 919 } 920 921 size = MIN(size, (1 << 20) - 1); /* avoid unbounded allocation */ 922 buf = g_malloc(size + 1); 923 924 ret = bdrv_pread(file, desc_offset, size, buf, 0); 925 if (ret < 0) { 926 error_setg_errno(errp, -ret, "Could not read from file"); 927 g_free(buf); 928 return NULL; 929 } 930 buf[size] = 0; 931 932 return buf; 933 } 934 935 static int GRAPH_RDLOCK 936 vmdk_open_vmdk4(BlockDriverState *bs, BdrvChild *file, int flags, 937 QDict *options, Error **errp) 938 { 939 int ret; 940 uint32_t magic; 941 uint32_t l1_size, l1_entry_sectors; 942 VMDK4Header header; 943 VmdkExtent *extent = NULL; 944 BDRVVmdkState *s = bs->opaque; 945 int64_t l1_backup_offset = 0; 946 bool compressed; 947 948 ret = bdrv_pread(file, sizeof(magic), sizeof(header), &header, 0); 949 if (ret < 0) { 950 bdrv_refresh_filename(file->bs); 951 error_setg_errno(errp, -ret, 952 "Could not read header from file '%s'", 953 file->bs->filename); 954 return -EINVAL; 955 } 956 if (header.capacity == 0) { 957 uint64_t desc_offset = le64_to_cpu(header.desc_offset); 958 if (desc_offset) { 959 char *buf = vmdk_read_desc(file, desc_offset << 9, errp); 960 if (!buf) { 961 return -EINVAL; 962 } 963 ret = vmdk_open_desc_file(bs, flags, buf, options, errp); 964 g_free(buf); 965 return ret; 966 } 967 } 968 969 if (!s->create_type) { 970 s->create_type = g_strdup("monolithicSparse"); 971 } 972 973 if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) { 974 /* 975 * The footer takes precedence over the header, so read it in. The 976 * footer starts at offset -1024 from the end: One sector for the 977 * footer, and another one for the end-of-stream marker. 978 */ 979 struct { 980 struct { 981 uint64_t val; 982 uint32_t size; 983 uint32_t type; 984 uint8_t pad[512 - 16]; 985 } QEMU_PACKED footer_marker; 986 987 uint32_t magic; 988 VMDK4Header header; 989 uint8_t pad[512 - 4 - sizeof(VMDK4Header)]; 990 991 struct { 992 uint64_t val; 993 uint32_t size; 994 uint32_t type; 995 uint8_t pad[512 - 16]; 996 } QEMU_PACKED eos_marker; 997 } QEMU_PACKED footer; 998 999 ret = bdrv_pread(file, bs->file->bs->total_sectors * 512 - 1536, 1000 sizeof(footer), &footer, 0); 1001 if (ret < 0) { 1002 error_setg_errno(errp, -ret, "Failed to read footer"); 1003 return ret; 1004 } 1005 1006 /* Some sanity checks for the footer */ 1007 if (be32_to_cpu(footer.magic) != VMDK4_MAGIC || 1008 le32_to_cpu(footer.footer_marker.size) != 0 || 1009 le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER || 1010 le64_to_cpu(footer.eos_marker.val) != 0 || 1011 le32_to_cpu(footer.eos_marker.size) != 0 || 1012 le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM) 1013 { 1014 error_setg(errp, "Invalid footer"); 1015 return -EINVAL; 1016 } 1017 1018 header = footer.header; 1019 } 1020 1021 compressed = 1022 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; 1023 if (le32_to_cpu(header.version) > 3) { 1024 error_setg(errp, "Unsupported VMDK version %" PRIu32, 1025 le32_to_cpu(header.version)); 1026 return -ENOTSUP; 1027 } else if (le32_to_cpu(header.version) == 3 && (flags & BDRV_O_RDWR) && 1028 !compressed) { 1029 /* VMware KB 2064959 explains that version 3 added support for 1030 * persistent changed block tracking (CBT), and backup software can 1031 * read it as version=1 if it doesn't care about the changed area 1032 * information. So we are safe to enable read only. */ 1033 error_setg(errp, "VMDK version 3 must be read only"); 1034 return -EINVAL; 1035 } 1036 1037 if (le32_to_cpu(header.num_gtes_per_gt) > 512) { 1038 error_setg(errp, "L2 table size too big"); 1039 return -EINVAL; 1040 } 1041 1042 l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gt) 1043 * le64_to_cpu(header.granularity); 1044 if (l1_entry_sectors == 0) { 1045 error_setg(errp, "L1 entry size is invalid"); 1046 return -EINVAL; 1047 } 1048 l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1) 1049 / l1_entry_sectors; 1050 if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) { 1051 l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9; 1052 } 1053 if (bdrv_nb_sectors(file->bs) < le64_to_cpu(header.grain_offset)) { 1054 error_setg(errp, "File truncated, expecting at least %" PRId64 " bytes", 1055 (int64_t)(le64_to_cpu(header.grain_offset) 1056 * BDRV_SECTOR_SIZE)); 1057 return -EINVAL; 1058 } 1059 1060 ret = vmdk_add_extent(bs, file, false, 1061 le64_to_cpu(header.capacity), 1062 le64_to_cpu(header.gd_offset) << 9, 1063 l1_backup_offset, 1064 l1_size, 1065 le32_to_cpu(header.num_gtes_per_gt), 1066 le64_to_cpu(header.granularity), 1067 &extent, 1068 errp); 1069 if (ret < 0) { 1070 return ret; 1071 } 1072 extent->compressed = 1073 le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; 1074 if (extent->compressed) { 1075 g_free(s->create_type); 1076 s->create_type = g_strdup("streamOptimized"); 1077 } 1078 extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER; 1079 extent->version = le32_to_cpu(header.version); 1080 extent->has_zero_grain = le32_to_cpu(header.flags) & VMDK4_FLAG_ZERO_GRAIN; 1081 ret = vmdk_init_tables(bs, extent, errp); 1082 if (ret) { 1083 /* free extent allocated by vmdk_add_extent */ 1084 vmdk_free_last_extent(bs); 1085 } 1086 return ret; 1087 } 1088 1089 /* find an option value out of descriptor file */ 1090 static int vmdk_parse_description(const char *desc, const char *opt_name, 1091 char *buf, int buf_size) 1092 { 1093 char *opt_pos, *opt_end; 1094 const char *end = desc + strlen(desc); 1095 1096 opt_pos = strstr(desc, opt_name); 1097 if (!opt_pos) { 1098 return VMDK_ERROR; 1099 } 1100 /* Skip "=\"" following opt_name */ 1101 opt_pos += strlen(opt_name) + 2; 1102 if (opt_pos >= end) { 1103 return VMDK_ERROR; 1104 } 1105 opt_end = opt_pos; 1106 while (opt_end < end && *opt_end != '"') { 1107 opt_end++; 1108 } 1109 if (opt_end == end || buf_size < opt_end - opt_pos + 1) { 1110 return VMDK_ERROR; 1111 } 1112 pstrcpy(buf, opt_end - opt_pos + 1, opt_pos); 1113 return VMDK_OK; 1114 } 1115 1116 /* Open an extent file and append to bs array */ 1117 static int GRAPH_RDLOCK 1118 vmdk_open_sparse(BlockDriverState *bs, BdrvChild *file, int flags, 1119 char *buf, QDict *options, Error **errp) 1120 { 1121 uint32_t magic; 1122 1123 magic = ldl_be_p(buf); 1124 switch (magic) { 1125 case VMDK3_MAGIC: 1126 return vmdk_open_vmfs_sparse(bs, file, flags, errp); 1127 case VMDK4_MAGIC: 1128 return vmdk_open_vmdk4(bs, file, flags, options, errp); 1129 default: 1130 error_setg(errp, "Image not in VMDK format"); 1131 return -EINVAL; 1132 } 1133 } 1134 1135 static const char *next_line(const char *s) 1136 { 1137 while (*s) { 1138 if (*s == '\n') { 1139 return s + 1; 1140 } 1141 s++; 1142 } 1143 return s; 1144 } 1145 1146 static int GRAPH_RDLOCK 1147 vmdk_parse_extents(const char *desc, BlockDriverState *bs, QDict *options, 1148 Error **errp) 1149 { 1150 ERRP_GUARD(); 1151 int ret; 1152 int matches; 1153 char access[11]; 1154 char type[11]; 1155 char fname[512]; 1156 const char *p, *np; 1157 int64_t sectors = 0; 1158 int64_t flat_offset; 1159 char *desc_file_dir = NULL; 1160 char *extent_path; 1161 BdrvChild *extent_file; 1162 BdrvChildRole extent_role; 1163 BDRVVmdkState *s = bs->opaque; 1164 VmdkExtent *extent = NULL; 1165 char extent_opt_prefix[32]; 1166 Error *local_err = NULL; 1167 1168 GLOBAL_STATE_CODE(); 1169 1170 for (p = desc; *p; p = next_line(p)) { 1171 /* parse extent line in one of below formats: 1172 * 1173 * RW [size in sectors] FLAT "file-name.vmdk" OFFSET 1174 * RW [size in sectors] SPARSE "file-name.vmdk" 1175 * RW [size in sectors] VMFS "file-name.vmdk" 1176 * RW [size in sectors] VMFSSPARSE "file-name.vmdk" 1177 * RW [size in sectors] SESPARSE "file-name.vmdk" 1178 */ 1179 flat_offset = -1; 1180 matches = sscanf(p, "%10s %" SCNd64 " %10s \"%511[^\n\r\"]\" %" SCNd64, 1181 access, §ors, type, fname, &flat_offset); 1182 if (matches < 4 || strcmp(access, "RW")) { 1183 continue; 1184 } else if (!strcmp(type, "FLAT")) { 1185 if (matches != 5 || flat_offset < 0) { 1186 goto invalid; 1187 } 1188 } else if (!strcmp(type, "VMFS")) { 1189 if (matches == 4) { 1190 flat_offset = 0; 1191 } else { 1192 goto invalid; 1193 } 1194 } else if (matches != 4) { 1195 goto invalid; 1196 } 1197 1198 if (sectors <= 0 || 1199 (strcmp(type, "FLAT") && strcmp(type, "SPARSE") && 1200 strcmp(type, "VMFS") && strcmp(type, "VMFSSPARSE") && 1201 strcmp(type, "SESPARSE")) || 1202 (strcmp(access, "RW"))) { 1203 continue; 1204 } 1205 1206 if (path_is_absolute(fname)) { 1207 extent_path = g_strdup(fname); 1208 } else { 1209 if (!desc_file_dir) { 1210 desc_file_dir = bdrv_dirname(bs->file->bs, errp); 1211 if (!desc_file_dir) { 1212 bdrv_refresh_filename(bs->file->bs); 1213 error_prepend(errp, "Cannot use relative paths with VMDK " 1214 "descriptor file '%s': ", 1215 bs->file->bs->filename); 1216 ret = -EINVAL; 1217 goto out; 1218 } 1219 } 1220 1221 extent_path = g_strconcat(desc_file_dir, fname, NULL); 1222 } 1223 1224 ret = snprintf(extent_opt_prefix, 32, "extents.%d", s->num_extents); 1225 assert(ret < 32); 1226 1227 extent_role = BDRV_CHILD_DATA; 1228 if (strcmp(type, "FLAT") != 0 && strcmp(type, "VMFS") != 0) { 1229 /* non-flat extents have metadata */ 1230 extent_role |= BDRV_CHILD_METADATA; 1231 } 1232 1233 extent_file = bdrv_open_child(extent_path, options, extent_opt_prefix, 1234 bs, &child_of_bds, extent_role, false, 1235 &local_err); 1236 g_free(extent_path); 1237 if (!extent_file) { 1238 error_propagate(errp, local_err); 1239 ret = -EINVAL; 1240 goto out; 1241 } 1242 1243 /* save to extents array */ 1244 if (!strcmp(type, "FLAT") || !strcmp(type, "VMFS")) { 1245 /* FLAT extent */ 1246 1247 ret = vmdk_add_extent(bs, extent_file, true, sectors, 1248 0, 0, 0, 0, 0, &extent, errp); 1249 if (ret < 0) { 1250 bdrv_graph_rdunlock_main_loop(); 1251 bdrv_graph_wrlock(); 1252 bdrv_unref_child(bs, extent_file); 1253 bdrv_graph_wrunlock(); 1254 bdrv_graph_rdlock_main_loop(); 1255 goto out; 1256 } 1257 extent->flat_start_offset = flat_offset << 9; 1258 } else if (!strcmp(type, "SPARSE") || !strcmp(type, "VMFSSPARSE")) { 1259 /* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/ 1260 char *buf = vmdk_read_desc(extent_file, 0, errp); 1261 if (!buf) { 1262 ret = -EINVAL; 1263 } else { 1264 ret = vmdk_open_sparse(bs, extent_file, bs->open_flags, buf, 1265 options, errp); 1266 } 1267 g_free(buf); 1268 if (ret) { 1269 bdrv_graph_rdunlock_main_loop(); 1270 bdrv_graph_wrlock(); 1271 bdrv_unref_child(bs, extent_file); 1272 bdrv_graph_wrunlock(); 1273 bdrv_graph_rdlock_main_loop(); 1274 goto out; 1275 } 1276 extent = &s->extents[s->num_extents - 1]; 1277 } else if (!strcmp(type, "SESPARSE")) { 1278 ret = vmdk_open_se_sparse(bs, extent_file, bs->open_flags, errp); 1279 if (ret) { 1280 bdrv_graph_rdunlock_main_loop(); 1281 bdrv_graph_wrlock(); 1282 bdrv_unref_child(bs, extent_file); 1283 bdrv_graph_wrunlock(); 1284 bdrv_graph_rdlock_main_loop(); 1285 goto out; 1286 } 1287 extent = &s->extents[s->num_extents - 1]; 1288 } else { 1289 error_setg(errp, "Unsupported extent type '%s'", type); 1290 bdrv_graph_rdunlock_main_loop(); 1291 bdrv_graph_wrlock(); 1292 bdrv_unref_child(bs, extent_file); 1293 bdrv_graph_wrunlock(); 1294 bdrv_graph_rdlock_main_loop(); 1295 ret = -ENOTSUP; 1296 goto out; 1297 } 1298 extent->type = g_strdup(type); 1299 } 1300 1301 ret = 0; 1302 goto out; 1303 1304 invalid: 1305 np = next_line(p); 1306 assert(np != p); 1307 if (np[-1] == '\n') { 1308 np--; 1309 } 1310 error_setg(errp, "Invalid extent line: %.*s", (int)(np - p), p); 1311 ret = -EINVAL; 1312 1313 out: 1314 g_free(desc_file_dir); 1315 return ret; 1316 } 1317 1318 static int GRAPH_RDLOCK 1319 vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf, QDict *options, 1320 Error **errp) 1321 { 1322 int ret; 1323 char ct[128]; 1324 BDRVVmdkState *s = bs->opaque; 1325 1326 if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) { 1327 error_setg(errp, "invalid VMDK image descriptor"); 1328 ret = -EINVAL; 1329 goto exit; 1330 } 1331 if (strcmp(ct, "monolithicFlat") && 1332 strcmp(ct, "vmfs") && 1333 strcmp(ct, "vmfsSparse") && 1334 strcmp(ct, "seSparse") && 1335 strcmp(ct, "twoGbMaxExtentSparse") && 1336 strcmp(ct, "twoGbMaxExtentFlat")) { 1337 error_setg(errp, "Unsupported image type '%s'", ct); 1338 ret = -ENOTSUP; 1339 goto exit; 1340 } 1341 s->create_type = g_strdup(ct); 1342 s->desc_offset = 0; 1343 ret = vmdk_parse_extents(buf, bs, options, errp); 1344 exit: 1345 return ret; 1346 } 1347 1348 static int vmdk_open(BlockDriverState *bs, QDict *options, int flags, 1349 Error **errp) 1350 { 1351 char *buf; 1352 int ret; 1353 BDRVVmdkState *s = bs->opaque; 1354 uint32_t magic; 1355 1356 GRAPH_RDLOCK_GUARD_MAINLOOP(); 1357 1358 ret = bdrv_open_file_child(NULL, options, "file", bs, errp); 1359 if (ret < 0) { 1360 return ret; 1361 } 1362 1363 buf = vmdk_read_desc(bs->file, 0, errp); 1364 if (!buf) { 1365 return -EINVAL; 1366 } 1367 1368 magic = ldl_be_p(buf); 1369 switch (magic) { 1370 case VMDK3_MAGIC: 1371 case VMDK4_MAGIC: 1372 ret = vmdk_open_sparse(bs, bs->file, flags, buf, options, 1373 errp); 1374 s->desc_offset = 0x200; 1375 break; 1376 default: 1377 /* No data in the descriptor file */ 1378 bs->file->role &= ~BDRV_CHILD_DATA; 1379 1380 /* Must succeed because we have given up permissions if anything */ 1381 bdrv_child_refresh_perms(bs, bs->file, &error_abort); 1382 1383 ret = vmdk_open_desc_file(bs, flags, buf, options, errp); 1384 break; 1385 } 1386 if (ret) { 1387 goto fail; 1388 } 1389 1390 /* try to open parent images, if exist */ 1391 ret = vmdk_parent_open(bs); 1392 if (ret) { 1393 goto fail; 1394 } 1395 ret = vmdk_read_cid(bs, 0, &s->cid); 1396 if (ret) { 1397 goto fail; 1398 } 1399 ret = vmdk_read_cid(bs, 1, &s->parent_cid); 1400 if (ret) { 1401 goto fail; 1402 } 1403 qemu_co_mutex_init(&s->lock); 1404 1405 /* Disable migration when VMDK images are used */ 1406 error_setg(&s->migration_blocker, "The vmdk format used by node '%s' " 1407 "does not support live migration", 1408 bdrv_get_device_or_node_name(bs)); 1409 ret = migrate_add_blocker_normal(&s->migration_blocker, errp); 1410 if (ret < 0) { 1411 goto fail; 1412 } 1413 1414 g_free(buf); 1415 return 0; 1416 1417 fail: 1418 g_free(buf); 1419 g_free(s->create_type); 1420 s->create_type = NULL; 1421 vmdk_free_extents(bs); 1422 return ret; 1423 } 1424 1425 1426 static void vmdk_refresh_limits(BlockDriverState *bs, Error **errp) 1427 { 1428 BDRVVmdkState *s = bs->opaque; 1429 int i; 1430 1431 for (i = 0; i < s->num_extents; i++) { 1432 if (!s->extents[i].flat) { 1433 bs->bl.pwrite_zeroes_alignment = 1434 MAX(bs->bl.pwrite_zeroes_alignment, 1435 s->extents[i].cluster_sectors << BDRV_SECTOR_BITS); 1436 } 1437 } 1438 } 1439 1440 /** 1441 * get_whole_cluster 1442 * 1443 * Copy backing file's cluster that covers @sector_num, otherwise write zero, 1444 * to the cluster at @cluster_sector_num. If @zeroed is true, we're overwriting 1445 * a zeroed cluster in the current layer and must not copy data from the 1446 * backing file. 1447 * 1448 * If @skip_start_sector < @skip_end_sector, the relative range 1449 * [@skip_start_sector, @skip_end_sector) is not copied or written, and leave 1450 * it for call to write user data in the request. 1451 */ 1452 static int coroutine_fn GRAPH_RDLOCK 1453 get_whole_cluster(BlockDriverState *bs, VmdkExtent *extent, 1454 uint64_t cluster_offset, uint64_t offset, 1455 uint64_t skip_start_bytes, uint64_t skip_end_bytes, 1456 bool zeroed) 1457 { 1458 int ret = VMDK_OK; 1459 int64_t cluster_bytes; 1460 uint8_t *whole_grain; 1461 bool copy_from_backing; 1462 1463 /* For COW, align request sector_num to cluster start */ 1464 cluster_bytes = extent->cluster_sectors << BDRV_SECTOR_BITS; 1465 offset = QEMU_ALIGN_DOWN(offset, cluster_bytes); 1466 whole_grain = qemu_blockalign(bs, cluster_bytes); 1467 copy_from_backing = bs->backing && !zeroed; 1468 1469 if (!copy_from_backing) { 1470 memset(whole_grain, 0, skip_start_bytes); 1471 memset(whole_grain + skip_end_bytes, 0, cluster_bytes - skip_end_bytes); 1472 } 1473 1474 assert(skip_end_bytes <= cluster_bytes); 1475 /* we will be here if it's first write on non-exist grain(cluster). 1476 * try to read from parent image, if exist */ 1477 if (bs->backing && !vmdk_is_cid_valid(bs)) { 1478 ret = VMDK_ERROR; 1479 goto exit; 1480 } 1481 1482 /* Read backing data before skip range */ 1483 if (skip_start_bytes > 0) { 1484 if (copy_from_backing) { 1485 /* qcow2 emits this on bs->file instead of bs->backing */ 1486 BLKDBG_CO_EVENT(extent->file, BLKDBG_COW_READ); 1487 ret = bdrv_co_pread(bs->backing, offset, skip_start_bytes, 1488 whole_grain, 0); 1489 if (ret < 0) { 1490 ret = VMDK_ERROR; 1491 goto exit; 1492 } 1493 } 1494 BLKDBG_CO_EVENT(extent->file, BLKDBG_COW_WRITE); 1495 ret = bdrv_co_pwrite(extent->file, cluster_offset, skip_start_bytes, 1496 whole_grain, 0); 1497 if (ret < 0) { 1498 ret = VMDK_ERROR; 1499 goto exit; 1500 } 1501 } 1502 /* Read backing data after skip range */ 1503 if (skip_end_bytes < cluster_bytes) { 1504 if (copy_from_backing) { 1505 /* qcow2 emits this on bs->file instead of bs->backing */ 1506 BLKDBG_CO_EVENT(extent->file, BLKDBG_COW_READ); 1507 ret = bdrv_co_pread(bs->backing, offset + skip_end_bytes, 1508 cluster_bytes - skip_end_bytes, 1509 whole_grain + skip_end_bytes, 0); 1510 if (ret < 0) { 1511 ret = VMDK_ERROR; 1512 goto exit; 1513 } 1514 } 1515 BLKDBG_CO_EVENT(extent->file, BLKDBG_COW_WRITE); 1516 ret = bdrv_co_pwrite(extent->file, cluster_offset + skip_end_bytes, 1517 cluster_bytes - skip_end_bytes, 1518 whole_grain + skip_end_bytes, 0); 1519 if (ret < 0) { 1520 ret = VMDK_ERROR; 1521 goto exit; 1522 } 1523 } 1524 1525 ret = VMDK_OK; 1526 exit: 1527 qemu_vfree(whole_grain); 1528 return ret; 1529 } 1530 1531 static int coroutine_fn GRAPH_RDLOCK 1532 vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data, uint32_t offset) 1533 { 1534 offset = cpu_to_le32(offset); 1535 /* update L2 table */ 1536 BLKDBG_CO_EVENT(extent->file, BLKDBG_L2_UPDATE); 1537 if (bdrv_co_pwrite(extent->file, 1538 ((int64_t)m_data->l2_offset * 512) 1539 + (m_data->l2_index * sizeof(offset)), 1540 sizeof(offset), &offset, 0) < 0) { 1541 return VMDK_ERROR; 1542 } 1543 /* update backup L2 table */ 1544 if (extent->l1_backup_table_offset != 0) { 1545 m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; 1546 if (bdrv_co_pwrite(extent->file, 1547 ((int64_t)m_data->l2_offset * 512) 1548 + (m_data->l2_index * sizeof(offset)), 1549 sizeof(offset), &offset, 0) < 0) { 1550 return VMDK_ERROR; 1551 } 1552 } 1553 if (bdrv_co_flush(extent->file->bs) < 0) { 1554 return VMDK_ERROR; 1555 } 1556 if (m_data->l2_cache_entry) { 1557 *m_data->l2_cache_entry = offset; 1558 } 1559 1560 return VMDK_OK; 1561 } 1562 1563 /** 1564 * get_cluster_offset 1565 * 1566 * Look up cluster offset in extent file by sector number, and store in 1567 * @cluster_offset. 1568 * 1569 * For flat extents, the start offset as parsed from the description file is 1570 * returned. 1571 * 1572 * For sparse extents, look up in L1, L2 table. If allocate is true, return an 1573 * offset for a new cluster and update L2 cache. If there is a backing file, 1574 * COW is done before returning; otherwise, zeroes are written to the allocated 1575 * cluster. Both COW and zero writing skips the sector range 1576 * [@skip_start_sector, @skip_end_sector) passed in by caller, because caller 1577 * has new data to write there. 1578 * 1579 * Returns: VMDK_OK if cluster exists and mapped in the image. 1580 * VMDK_UNALLOC if cluster is not mapped and @allocate is false. 1581 * VMDK_ERROR if failed. 1582 */ 1583 static int coroutine_fn GRAPH_RDLOCK 1584 get_cluster_offset(BlockDriverState *bs, VmdkExtent *extent, 1585 VmdkMetaData *m_data, uint64_t offset, bool allocate, 1586 uint64_t *cluster_offset, uint64_t skip_start_bytes, 1587 uint64_t skip_end_bytes) 1588 { 1589 unsigned int l1_index, l2_offset, l2_index; 1590 int min_index, i, j; 1591 uint32_t min_count; 1592 void *l2_table; 1593 bool zeroed = false; 1594 int64_t ret; 1595 int64_t cluster_sector; 1596 unsigned int l2_size_bytes = extent->l2_size * extent->entry_size; 1597 1598 if (m_data) { 1599 m_data->new_allocation = false; 1600 } 1601 if (extent->flat) { 1602 *cluster_offset = extent->flat_start_offset; 1603 return VMDK_OK; 1604 } 1605 1606 offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE; 1607 l1_index = (offset >> 9) / extent->l1_entry_sectors; 1608 if (l1_index >= extent->l1_size) { 1609 return VMDK_ERROR; 1610 } 1611 if (extent->sesparse) { 1612 uint64_t l2_offset_u64; 1613 1614 assert(extent->entry_size == sizeof(uint64_t)); 1615 1616 l2_offset_u64 = ((uint64_t *)extent->l1_table)[l1_index]; 1617 if (l2_offset_u64 == 0) { 1618 l2_offset = 0; 1619 } else if ((l2_offset_u64 & 0xffffffff00000000) != 0x1000000000000000) { 1620 /* 1621 * Top most nibble is 0x1 if grain table is allocated. 1622 * strict check - top most 4 bytes must be 0x10000000 since max 1623 * supported size is 64TB for disk - so no more than 64TB / 16MB 1624 * grain directories which is smaller than uint32, 1625 * where 16MB is the only supported default grain table coverage. 1626 */ 1627 return VMDK_ERROR; 1628 } else { 1629 l2_offset_u64 = l2_offset_u64 & 0x00000000ffffffff; 1630 l2_offset_u64 = extent->sesparse_l2_tables_offset + 1631 l2_offset_u64 * l2_size_bytes / SECTOR_SIZE; 1632 if (l2_offset_u64 > 0x00000000ffffffff) { 1633 return VMDK_ERROR; 1634 } 1635 l2_offset = (unsigned int)(l2_offset_u64); 1636 } 1637 } else { 1638 assert(extent->entry_size == sizeof(uint32_t)); 1639 l2_offset = ((uint32_t *)extent->l1_table)[l1_index]; 1640 } 1641 if (!l2_offset) { 1642 return VMDK_UNALLOC; 1643 } 1644 for (i = 0; i < L2_CACHE_SIZE; i++) { 1645 if (l2_offset == extent->l2_cache_offsets[i]) { 1646 /* increment the hit count */ 1647 if (++extent->l2_cache_counts[i] == 0xffffffff) { 1648 for (j = 0; j < L2_CACHE_SIZE; j++) { 1649 extent->l2_cache_counts[j] >>= 1; 1650 } 1651 } 1652 l2_table = (char *)extent->l2_cache + (i * l2_size_bytes); 1653 goto found; 1654 } 1655 } 1656 /* not found: load a new entry in the least used one */ 1657 min_index = 0; 1658 min_count = 0xffffffff; 1659 for (i = 0; i < L2_CACHE_SIZE; i++) { 1660 if (extent->l2_cache_counts[i] < min_count) { 1661 min_count = extent->l2_cache_counts[i]; 1662 min_index = i; 1663 } 1664 } 1665 l2_table = (char *)extent->l2_cache + (min_index * l2_size_bytes); 1666 BLKDBG_CO_EVENT(extent->file, BLKDBG_L2_LOAD); 1667 if (bdrv_co_pread(extent->file, 1668 (int64_t)l2_offset * 512, 1669 l2_size_bytes, 1670 l2_table, 0 1671 ) < 0) { 1672 return VMDK_ERROR; 1673 } 1674 1675 extent->l2_cache_offsets[min_index] = l2_offset; 1676 extent->l2_cache_counts[min_index] = 1; 1677 found: 1678 l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size; 1679 if (m_data) { 1680 m_data->l1_index = l1_index; 1681 m_data->l2_index = l2_index; 1682 m_data->l2_offset = l2_offset; 1683 m_data->l2_cache_entry = ((uint32_t *)l2_table) + l2_index; 1684 } 1685 1686 if (extent->sesparse) { 1687 cluster_sector = le64_to_cpu(((uint64_t *)l2_table)[l2_index]); 1688 switch (cluster_sector & 0xf000000000000000) { 1689 case 0x0000000000000000: 1690 /* unallocated grain */ 1691 if (cluster_sector != 0) { 1692 return VMDK_ERROR; 1693 } 1694 break; 1695 case 0x1000000000000000: 1696 /* scsi-unmapped grain - fallthrough */ 1697 case 0x2000000000000000: 1698 /* zero grain */ 1699 zeroed = true; 1700 break; 1701 case 0x3000000000000000: 1702 /* allocated grain */ 1703 cluster_sector = (((cluster_sector & 0x0fff000000000000) >> 48) | 1704 ((cluster_sector & 0x0000ffffffffffff) << 12)); 1705 cluster_sector = extent->sesparse_clusters_offset + 1706 cluster_sector * extent->cluster_sectors; 1707 break; 1708 default: 1709 return VMDK_ERROR; 1710 } 1711 } else { 1712 cluster_sector = le32_to_cpu(((uint32_t *)l2_table)[l2_index]); 1713 1714 if (extent->has_zero_grain && cluster_sector == VMDK_GTE_ZEROED) { 1715 zeroed = true; 1716 } 1717 } 1718 1719 if (!cluster_sector || zeroed) { 1720 if (!allocate) { 1721 return zeroed ? VMDK_ZEROED : VMDK_UNALLOC; 1722 } 1723 assert(!extent->sesparse); 1724 1725 if (extent->next_cluster_sector >= VMDK_EXTENT_MAX_SECTORS) { 1726 return VMDK_ERROR; 1727 } 1728 1729 cluster_sector = extent->next_cluster_sector; 1730 extent->next_cluster_sector += extent->cluster_sectors; 1731 1732 /* First of all we write grain itself, to avoid race condition 1733 * that may to corrupt the image. 1734 * This problem may occur because of insufficient space on host disk 1735 * or inappropriate VM shutdown. 1736 */ 1737 ret = get_whole_cluster(bs, extent, cluster_sector * BDRV_SECTOR_SIZE, 1738 offset, skip_start_bytes, skip_end_bytes, 1739 zeroed); 1740 if (ret) { 1741 return ret; 1742 } 1743 if (m_data) { 1744 m_data->new_allocation = true; 1745 } 1746 } 1747 *cluster_offset = cluster_sector << BDRV_SECTOR_BITS; 1748 return VMDK_OK; 1749 } 1750 1751 static VmdkExtent *find_extent(BDRVVmdkState *s, 1752 int64_t sector_num, VmdkExtent *start_hint) 1753 { 1754 VmdkExtent *extent = start_hint; 1755 1756 if (!extent) { 1757 extent = &s->extents[0]; 1758 } 1759 while (extent < &s->extents[s->num_extents]) { 1760 if (sector_num < extent->end_sector) { 1761 return extent; 1762 } 1763 extent++; 1764 } 1765 return NULL; 1766 } 1767 1768 static inline uint64_t vmdk_find_offset_in_cluster(VmdkExtent *extent, 1769 int64_t offset) 1770 { 1771 uint64_t extent_begin_offset, extent_relative_offset; 1772 uint64_t cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE; 1773 1774 extent_begin_offset = 1775 (extent->end_sector - extent->sectors) * BDRV_SECTOR_SIZE; 1776 extent_relative_offset = offset - extent_begin_offset; 1777 return extent_relative_offset % cluster_size; 1778 } 1779 1780 static int coroutine_fn GRAPH_RDLOCK 1781 vmdk_co_block_status(BlockDriverState *bs, bool want_zero, 1782 int64_t offset, int64_t bytes, int64_t *pnum, 1783 int64_t *map, BlockDriverState **file) 1784 { 1785 BDRVVmdkState *s = bs->opaque; 1786 int64_t index_in_cluster, n, ret; 1787 uint64_t cluster_offset; 1788 VmdkExtent *extent; 1789 1790 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, NULL); 1791 if (!extent) { 1792 return -EIO; 1793 } 1794 qemu_co_mutex_lock(&s->lock); 1795 ret = get_cluster_offset(bs, extent, NULL, offset, false, &cluster_offset, 1796 0, 0); 1797 qemu_co_mutex_unlock(&s->lock); 1798 1799 index_in_cluster = vmdk_find_offset_in_cluster(extent, offset); 1800 switch (ret) { 1801 case VMDK_ERROR: 1802 ret = -EIO; 1803 break; 1804 case VMDK_UNALLOC: 1805 ret = 0; 1806 break; 1807 case VMDK_ZEROED: 1808 ret = BDRV_BLOCK_ZERO; 1809 break; 1810 case VMDK_OK: 1811 ret = BDRV_BLOCK_DATA; 1812 if (!extent->compressed) { 1813 ret |= BDRV_BLOCK_OFFSET_VALID; 1814 *map = cluster_offset + index_in_cluster; 1815 if (extent->flat) { 1816 ret |= BDRV_BLOCK_RECURSE; 1817 } 1818 } else { 1819 ret |= BDRV_BLOCK_COMPRESSED; 1820 } 1821 *file = extent->file->bs; 1822 break; 1823 } 1824 1825 n = extent->cluster_sectors * BDRV_SECTOR_SIZE - index_in_cluster; 1826 *pnum = MIN(n, bytes); 1827 return ret; 1828 } 1829 1830 static int coroutine_fn GRAPH_RDLOCK 1831 vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset, 1832 int64_t offset_in_cluster, QEMUIOVector *qiov, 1833 uint64_t qiov_offset, uint64_t n_bytes, 1834 uint64_t offset) 1835 { 1836 int ret; 1837 VmdkGrainMarker *data = NULL; 1838 uLongf buf_len; 1839 QEMUIOVector local_qiov; 1840 int64_t write_offset; 1841 int64_t write_end_sector; 1842 1843 if (extent->compressed) { 1844 void *compressed_data; 1845 1846 /* Only whole clusters */ 1847 if (offset_in_cluster || 1848 n_bytes > (extent->cluster_sectors * SECTOR_SIZE) || 1849 (n_bytes < (extent->cluster_sectors * SECTOR_SIZE) && 1850 offset + n_bytes != extent->end_sector * SECTOR_SIZE)) 1851 { 1852 ret = -EINVAL; 1853 goto out; 1854 } 1855 1856 if (!extent->has_marker) { 1857 ret = -EINVAL; 1858 goto out; 1859 } 1860 buf_len = (extent->cluster_sectors << 9) * 2; 1861 data = g_malloc(buf_len + sizeof(VmdkGrainMarker)); 1862 1863 compressed_data = g_malloc(n_bytes); 1864 qemu_iovec_to_buf(qiov, qiov_offset, compressed_data, n_bytes); 1865 ret = compress(data->data, &buf_len, compressed_data, n_bytes); 1866 g_free(compressed_data); 1867 1868 if (ret != Z_OK || buf_len == 0) { 1869 ret = -EINVAL; 1870 goto out; 1871 } 1872 1873 data->lba = cpu_to_le64(offset >> BDRV_SECTOR_BITS); 1874 data->size = cpu_to_le32(buf_len); 1875 1876 n_bytes = buf_len + sizeof(VmdkGrainMarker); 1877 qemu_iovec_init_buf(&local_qiov, data, n_bytes); 1878 1879 BLKDBG_CO_EVENT(extent->file, BLKDBG_WRITE_COMPRESSED); 1880 } else { 1881 qemu_iovec_init(&local_qiov, qiov->niov); 1882 qemu_iovec_concat(&local_qiov, qiov, qiov_offset, n_bytes); 1883 1884 BLKDBG_CO_EVENT(extent->file, BLKDBG_WRITE_AIO); 1885 } 1886 1887 write_offset = cluster_offset + offset_in_cluster; 1888 ret = bdrv_co_pwritev(extent->file, write_offset, n_bytes, 1889 &local_qiov, 0); 1890 1891 write_end_sector = DIV_ROUND_UP(write_offset + n_bytes, BDRV_SECTOR_SIZE); 1892 1893 if (extent->compressed) { 1894 extent->next_cluster_sector = write_end_sector; 1895 } else { 1896 extent->next_cluster_sector = MAX(extent->next_cluster_sector, 1897 write_end_sector); 1898 } 1899 1900 if (ret < 0) { 1901 goto out; 1902 } 1903 ret = 0; 1904 out: 1905 g_free(data); 1906 if (!extent->compressed) { 1907 qemu_iovec_destroy(&local_qiov); 1908 } 1909 return ret; 1910 } 1911 1912 static int coroutine_fn GRAPH_RDLOCK 1913 vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset, 1914 int64_t offset_in_cluster, QEMUIOVector *qiov, int bytes) 1915 { 1916 int ret; 1917 int cluster_bytes, buf_bytes; 1918 uint8_t *cluster_buf, *compressed_data; 1919 uint8_t *uncomp_buf; 1920 uint32_t data_len; 1921 VmdkGrainMarker *marker; 1922 uLongf buf_len; 1923 1924 1925 if (!extent->compressed) { 1926 BLKDBG_CO_EVENT(extent->file, BLKDBG_READ_AIO); 1927 ret = bdrv_co_preadv(extent->file, 1928 cluster_offset + offset_in_cluster, bytes, 1929 qiov, 0); 1930 if (ret < 0) { 1931 return ret; 1932 } 1933 return 0; 1934 } 1935 cluster_bytes = extent->cluster_sectors * 512; 1936 /* Read two clusters in case GrainMarker + compressed data > one cluster */ 1937 buf_bytes = cluster_bytes * 2; 1938 cluster_buf = g_malloc(buf_bytes); 1939 uncomp_buf = g_malloc(cluster_bytes); 1940 BLKDBG_CO_EVENT(extent->file, BLKDBG_READ_COMPRESSED); 1941 ret = bdrv_co_pread(extent->file, cluster_offset, buf_bytes, cluster_buf, 1942 0); 1943 if (ret < 0) { 1944 goto out; 1945 } 1946 compressed_data = cluster_buf; 1947 buf_len = cluster_bytes; 1948 data_len = cluster_bytes; 1949 if (extent->has_marker) { 1950 marker = (VmdkGrainMarker *)cluster_buf; 1951 compressed_data = marker->data; 1952 data_len = le32_to_cpu(marker->size); 1953 } 1954 if (!data_len || data_len > buf_bytes) { 1955 ret = -EINVAL; 1956 goto out; 1957 } 1958 ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len); 1959 if (ret != Z_OK) { 1960 ret = -EINVAL; 1961 goto out; 1962 1963 } 1964 if (offset_in_cluster < 0 || 1965 offset_in_cluster + bytes > buf_len) { 1966 ret = -EINVAL; 1967 goto out; 1968 } 1969 qemu_iovec_from_buf(qiov, 0, uncomp_buf + offset_in_cluster, bytes); 1970 ret = 0; 1971 1972 out: 1973 g_free(uncomp_buf); 1974 g_free(cluster_buf); 1975 return ret; 1976 } 1977 1978 static int coroutine_fn GRAPH_RDLOCK 1979 vmdk_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, 1980 QEMUIOVector *qiov, BdrvRequestFlags flags) 1981 { 1982 BDRVVmdkState *s = bs->opaque; 1983 int ret; 1984 uint64_t n_bytes, offset_in_cluster; 1985 VmdkExtent *extent = NULL; 1986 QEMUIOVector local_qiov; 1987 uint64_t cluster_offset; 1988 uint64_t bytes_done = 0; 1989 1990 qemu_iovec_init(&local_qiov, qiov->niov); 1991 qemu_co_mutex_lock(&s->lock); 1992 1993 while (bytes > 0) { 1994 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent); 1995 if (!extent) { 1996 ret = -EIO; 1997 goto fail; 1998 } 1999 ret = get_cluster_offset(bs, extent, NULL, 2000 offset, false, &cluster_offset, 0, 0); 2001 offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset); 2002 2003 n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE 2004 - offset_in_cluster); 2005 2006 if (ret != VMDK_OK) { 2007 /* if not allocated, try to read from parent image, if exist */ 2008 if (bs->backing && ret != VMDK_ZEROED) { 2009 if (!vmdk_is_cid_valid(bs)) { 2010 ret = -EINVAL; 2011 goto fail; 2012 } 2013 2014 qemu_iovec_reset(&local_qiov); 2015 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); 2016 2017 /* qcow2 emits this on bs->file instead of bs->backing */ 2018 BLKDBG_CO_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); 2019 ret = bdrv_co_preadv(bs->backing, offset, n_bytes, 2020 &local_qiov, 0); 2021 if (ret < 0) { 2022 goto fail; 2023 } 2024 } else { 2025 qemu_iovec_memset(qiov, bytes_done, 0, n_bytes); 2026 } 2027 } else { 2028 qemu_iovec_reset(&local_qiov); 2029 qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes); 2030 2031 ret = vmdk_read_extent(extent, cluster_offset, offset_in_cluster, 2032 &local_qiov, n_bytes); 2033 if (ret) { 2034 goto fail; 2035 } 2036 } 2037 bytes -= n_bytes; 2038 offset += n_bytes; 2039 bytes_done += n_bytes; 2040 } 2041 2042 ret = 0; 2043 fail: 2044 qemu_co_mutex_unlock(&s->lock); 2045 qemu_iovec_destroy(&local_qiov); 2046 2047 return ret; 2048 } 2049 2050 /** 2051 * vmdk_write: 2052 * @zeroed: buf is ignored (data is zero), use zeroed_grain GTE feature 2053 * if possible, otherwise return -ENOTSUP. 2054 * @zero_dry_run: used for zeroed == true only, don't update L2 table, just try 2055 * with each cluster. By dry run we can find if the zero write 2056 * is possible without modifying image data. 2057 * 2058 * Returns: error code with 0 for success. 2059 */ 2060 static int coroutine_fn GRAPH_RDLOCK 2061 vmdk_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes, 2062 QEMUIOVector *qiov, bool zeroed, bool zero_dry_run) 2063 { 2064 BDRVVmdkState *s = bs->opaque; 2065 VmdkExtent *extent = NULL; 2066 int ret; 2067 int64_t offset_in_cluster, n_bytes; 2068 uint64_t cluster_offset; 2069 uint64_t bytes_done = 0; 2070 VmdkMetaData m_data; 2071 2072 if (DIV_ROUND_UP(offset, BDRV_SECTOR_SIZE) > bs->total_sectors) { 2073 error_report("Wrong offset: offset=0x%" PRIx64 2074 " total_sectors=0x%" PRIx64, 2075 offset, bs->total_sectors); 2076 return -EIO; 2077 } 2078 2079 while (bytes > 0) { 2080 extent = find_extent(s, offset >> BDRV_SECTOR_BITS, extent); 2081 if (!extent) { 2082 return -EIO; 2083 } 2084 if (extent->sesparse) { 2085 return -ENOTSUP; 2086 } 2087 offset_in_cluster = vmdk_find_offset_in_cluster(extent, offset); 2088 n_bytes = MIN(bytes, extent->cluster_sectors * BDRV_SECTOR_SIZE 2089 - offset_in_cluster); 2090 2091 ret = get_cluster_offset(bs, extent, &m_data, offset, 2092 !(extent->compressed || zeroed), 2093 &cluster_offset, offset_in_cluster, 2094 offset_in_cluster + n_bytes); 2095 if (extent->compressed) { 2096 if (ret == VMDK_OK) { 2097 /* Refuse write to allocated cluster for streamOptimized */ 2098 error_report("Could not write to allocated cluster" 2099 " for streamOptimized"); 2100 return -EIO; 2101 } else if (!zeroed) { 2102 /* allocate */ 2103 ret = get_cluster_offset(bs, extent, &m_data, offset, 2104 true, &cluster_offset, 0, 0); 2105 } 2106 } 2107 if (ret == VMDK_ERROR) { 2108 return -EINVAL; 2109 } 2110 if (zeroed) { 2111 /* Do zeroed write, buf is ignored */ 2112 if (extent->has_zero_grain && 2113 offset_in_cluster == 0 && 2114 n_bytes >= extent->cluster_sectors * BDRV_SECTOR_SIZE) { 2115 n_bytes = extent->cluster_sectors * BDRV_SECTOR_SIZE; 2116 if (!zero_dry_run && ret != VMDK_ZEROED) { 2117 /* update L2 tables */ 2118 if (vmdk_L2update(extent, &m_data, VMDK_GTE_ZEROED) 2119 != VMDK_OK) { 2120 return -EIO; 2121 } 2122 } 2123 } else { 2124 return -ENOTSUP; 2125 } 2126 } else { 2127 ret = vmdk_write_extent(extent, cluster_offset, offset_in_cluster, 2128 qiov, bytes_done, n_bytes, offset); 2129 if (ret) { 2130 return ret; 2131 } 2132 if (m_data.new_allocation) { 2133 /* update L2 tables */ 2134 if (vmdk_L2update(extent, &m_data, 2135 cluster_offset >> BDRV_SECTOR_BITS) 2136 != VMDK_OK) { 2137 return -EIO; 2138 } 2139 } 2140 } 2141 bytes -= n_bytes; 2142 offset += n_bytes; 2143 bytes_done += n_bytes; 2144 2145 /* update CID on the first write every time the virtual disk is 2146 * opened */ 2147 if (!s->cid_updated) { 2148 ret = vmdk_write_cid(bs, g_random_int()); 2149 if (ret < 0) { 2150 return ret; 2151 } 2152 s->cid_updated = true; 2153 } 2154 } 2155 return 0; 2156 } 2157 2158 static int coroutine_fn GRAPH_RDLOCK 2159 vmdk_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, 2160 QEMUIOVector *qiov, BdrvRequestFlags flags) 2161 { 2162 int ret; 2163 BDRVVmdkState *s = bs->opaque; 2164 qemu_co_mutex_lock(&s->lock); 2165 ret = vmdk_pwritev(bs, offset, bytes, qiov, false, false); 2166 qemu_co_mutex_unlock(&s->lock); 2167 return ret; 2168 } 2169 2170 static int coroutine_fn GRAPH_RDLOCK 2171 vmdk_co_pwritev_compressed(BlockDriverState *bs, int64_t offset, int64_t bytes, 2172 QEMUIOVector *qiov) 2173 { 2174 if (bytes == 0) { 2175 /* The caller will write bytes 0 to signal EOF. 2176 * When receive it, we align EOF to a sector boundary. */ 2177 BDRVVmdkState *s = bs->opaque; 2178 int i, ret; 2179 int64_t length; 2180 2181 for (i = 0; i < s->num_extents; i++) { 2182 length = bdrv_co_getlength(s->extents[i].file->bs); 2183 if (length < 0) { 2184 return length; 2185 } 2186 length = QEMU_ALIGN_UP(length, BDRV_SECTOR_SIZE); 2187 ret = bdrv_co_truncate(s->extents[i].file, length, false, 2188 PREALLOC_MODE_OFF, 0, NULL); 2189 if (ret < 0) { 2190 return ret; 2191 } 2192 } 2193 return 0; 2194 } 2195 return vmdk_co_pwritev(bs, offset, bytes, qiov, 0); 2196 } 2197 2198 static int coroutine_fn GRAPH_RDLOCK 2199 vmdk_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes, 2200 BdrvRequestFlags flags) 2201 { 2202 int ret; 2203 BDRVVmdkState *s = bs->opaque; 2204 2205 qemu_co_mutex_lock(&s->lock); 2206 /* write zeroes could fail if sectors not aligned to cluster, test it with 2207 * dry_run == true before really updating image */ 2208 ret = vmdk_pwritev(bs, offset, bytes, NULL, true, true); 2209 if (!ret) { 2210 ret = vmdk_pwritev(bs, offset, bytes, NULL, true, false); 2211 } 2212 qemu_co_mutex_unlock(&s->lock); 2213 return ret; 2214 } 2215 2216 static int coroutine_fn GRAPH_UNLOCKED 2217 vmdk_init_extent(BlockBackend *blk, int64_t filesize, bool flat, bool compress, 2218 bool zeroed_grain, Error **errp) 2219 { 2220 int ret, i; 2221 VMDK4Header header; 2222 uint32_t tmp, magic, grains, gd_sectors, gt_size, gt_count; 2223 uint32_t *gd_buf = NULL; 2224 int gd_buf_size; 2225 2226 if (flat) { 2227 ret = blk_co_truncate(blk, filesize, false, PREALLOC_MODE_OFF, 0, errp); 2228 goto exit; 2229 } 2230 magic = cpu_to_be32(VMDK4_MAGIC); 2231 memset(&header, 0, sizeof(header)); 2232 if (compress) { 2233 header.version = 3; 2234 } else if (zeroed_grain) { 2235 header.version = 2; 2236 } else { 2237 header.version = 1; 2238 } 2239 header.flags = VMDK4_FLAG_RGD | VMDK4_FLAG_NL_DETECT 2240 | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0) 2241 | (zeroed_grain ? VMDK4_FLAG_ZERO_GRAIN : 0); 2242 header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0; 2243 header.capacity = filesize / BDRV_SECTOR_SIZE; 2244 header.granularity = 128; 2245 header.num_gtes_per_gt = BDRV_SECTOR_SIZE; 2246 2247 grains = DIV_ROUND_UP(filesize / BDRV_SECTOR_SIZE, header.granularity); 2248 gt_size = DIV_ROUND_UP(header.num_gtes_per_gt * sizeof(uint32_t), 2249 BDRV_SECTOR_SIZE); 2250 gt_count = DIV_ROUND_UP(grains, header.num_gtes_per_gt); 2251 gd_sectors = DIV_ROUND_UP(gt_count * sizeof(uint32_t), BDRV_SECTOR_SIZE); 2252 2253 header.desc_offset = 1; 2254 header.desc_size = 20; 2255 header.rgd_offset = header.desc_offset + header.desc_size; 2256 header.gd_offset = header.rgd_offset + gd_sectors + (gt_size * gt_count); 2257 header.grain_offset = 2258 ROUND_UP(header.gd_offset + gd_sectors + (gt_size * gt_count), 2259 header.granularity); 2260 /* swap endianness for all header fields */ 2261 header.version = cpu_to_le32(header.version); 2262 header.flags = cpu_to_le32(header.flags); 2263 header.capacity = cpu_to_le64(header.capacity); 2264 header.granularity = cpu_to_le64(header.granularity); 2265 header.num_gtes_per_gt = cpu_to_le32(header.num_gtes_per_gt); 2266 header.desc_offset = cpu_to_le64(header.desc_offset); 2267 header.desc_size = cpu_to_le64(header.desc_size); 2268 header.rgd_offset = cpu_to_le64(header.rgd_offset); 2269 header.gd_offset = cpu_to_le64(header.gd_offset); 2270 header.grain_offset = cpu_to_le64(header.grain_offset); 2271 header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm); 2272 2273 header.check_bytes[0] = 0xa; 2274 header.check_bytes[1] = 0x20; 2275 header.check_bytes[2] = 0xd; 2276 header.check_bytes[3] = 0xa; 2277 2278 /* write all the data */ 2279 ret = blk_co_pwrite(blk, 0, sizeof(magic), &magic, 0); 2280 if (ret < 0) { 2281 error_setg(errp, QERR_IO_ERROR); 2282 goto exit; 2283 } 2284 ret = blk_co_pwrite(blk, sizeof(magic), sizeof(header), &header, 0); 2285 if (ret < 0) { 2286 error_setg(errp, QERR_IO_ERROR); 2287 goto exit; 2288 } 2289 2290 ret = blk_co_truncate(blk, le64_to_cpu(header.grain_offset) << 9, false, 2291 PREALLOC_MODE_OFF, 0, errp); 2292 if (ret < 0) { 2293 goto exit; 2294 } 2295 2296 /* write grain directory */ 2297 gd_buf_size = gd_sectors * BDRV_SECTOR_SIZE; 2298 gd_buf = g_malloc0(gd_buf_size); 2299 for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_sectors; 2300 i < gt_count; i++, tmp += gt_size) { 2301 gd_buf[i] = cpu_to_le32(tmp); 2302 } 2303 ret = blk_co_pwrite(blk, le64_to_cpu(header.rgd_offset) * BDRV_SECTOR_SIZE, 2304 gd_buf_size, gd_buf, 0); 2305 if (ret < 0) { 2306 error_setg(errp, QERR_IO_ERROR); 2307 goto exit; 2308 } 2309 2310 /* write backup grain directory */ 2311 for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_sectors; 2312 i < gt_count; i++, tmp += gt_size) { 2313 gd_buf[i] = cpu_to_le32(tmp); 2314 } 2315 ret = blk_co_pwrite(blk, le64_to_cpu(header.gd_offset) * BDRV_SECTOR_SIZE, 2316 gd_buf_size, gd_buf, 0); 2317 if (ret < 0) { 2318 error_setg(errp, QERR_IO_ERROR); 2319 } 2320 2321 ret = 0; 2322 exit: 2323 g_free(gd_buf); 2324 return ret; 2325 } 2326 2327 static int coroutine_fn GRAPH_UNLOCKED 2328 vmdk_create_extent(const char *filename, int64_t filesize, bool flat, 2329 bool compress, bool zeroed_grain, BlockBackend **pbb, 2330 QemuOpts *opts, Error **errp) 2331 { 2332 int ret; 2333 BlockBackend *blk = NULL; 2334 2335 ret = bdrv_co_create_file(filename, opts, errp); 2336 if (ret < 0) { 2337 goto exit; 2338 } 2339 2340 blk = blk_co_new_open(filename, NULL, NULL, 2341 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, 2342 errp); 2343 if (blk == NULL) { 2344 ret = -EIO; 2345 goto exit; 2346 } 2347 2348 blk_set_allow_write_beyond_eof(blk, true); 2349 2350 ret = vmdk_init_extent(blk, filesize, flat, compress, zeroed_grain, errp); 2351 exit: 2352 if (blk) { 2353 if (pbb) { 2354 *pbb = blk; 2355 } else { 2356 blk_co_unref(blk); 2357 blk = NULL; 2358 } 2359 } 2360 return ret; 2361 } 2362 2363 static int filename_decompose(const char *filename, char *path, char *prefix, 2364 char *postfix, size_t buf_len, Error **errp) 2365 { 2366 const char *p, *q; 2367 2368 if (filename == NULL || !strlen(filename)) { 2369 error_setg(errp, "No filename provided"); 2370 return VMDK_ERROR; 2371 } 2372 p = strrchr(filename, '/'); 2373 if (p == NULL) { 2374 p = strrchr(filename, '\\'); 2375 } 2376 if (p == NULL) { 2377 p = strrchr(filename, ':'); 2378 } 2379 if (p != NULL) { 2380 p++; 2381 if (p - filename >= buf_len) { 2382 return VMDK_ERROR; 2383 } 2384 pstrcpy(path, p - filename + 1, filename); 2385 } else { 2386 p = filename; 2387 path[0] = '\0'; 2388 } 2389 q = strrchr(p, '.'); 2390 if (q == NULL) { 2391 pstrcpy(prefix, buf_len, p); 2392 postfix[0] = '\0'; 2393 } else { 2394 if (q - p >= buf_len) { 2395 return VMDK_ERROR; 2396 } 2397 pstrcpy(prefix, q - p + 1, p); 2398 pstrcpy(postfix, buf_len, q); 2399 } 2400 return VMDK_OK; 2401 } 2402 2403 /* 2404 * idx == 0: get or create the descriptor file (also the image file if in a 2405 * non-split format. 2406 * idx >= 1: get the n-th extent if in a split subformat 2407 */ 2408 typedef BlockBackend * coroutine_fn GRAPH_UNLOCKED_PTR 2409 (*vmdk_create_extent_fn)(int64_t size, int idx, bool flat, bool split, 2410 bool compress, bool zeroed_grain, void *opaque, 2411 Error **errp); 2412 2413 static void vmdk_desc_add_extent(GString *desc, 2414 const char *extent_line_fmt, 2415 int64_t size, const char *filename) 2416 { 2417 char *basename = g_path_get_basename(filename); 2418 2419 g_string_append_printf(desc, extent_line_fmt, 2420 DIV_ROUND_UP(size, BDRV_SECTOR_SIZE), basename); 2421 g_free(basename); 2422 } 2423 2424 static int coroutine_fn GRAPH_UNLOCKED 2425 vmdk_co_do_create(int64_t size, 2426 BlockdevVmdkSubformat subformat, 2427 BlockdevVmdkAdapterType adapter_type, 2428 const char *backing_file, 2429 const char *hw_version, 2430 const char *toolsversion, 2431 bool compat6, 2432 bool zeroed_grain, 2433 vmdk_create_extent_fn extent_fn, 2434 void *opaque, 2435 Error **errp) 2436 { 2437 int extent_idx; 2438 BlockBackend *blk = NULL; 2439 BlockBackend *extent_blk; 2440 Error *local_err = NULL; 2441 char *desc = NULL; 2442 int ret = 0; 2443 bool flat, split, compress; 2444 GString *ext_desc_lines; 2445 const int64_t split_size = 0x80000000; /* VMDK has constant split size */ 2446 int64_t extent_size; 2447 int64_t created_size = 0; 2448 const char *extent_line_fmt; 2449 char *parent_desc_line = g_malloc0(BUF_SIZE); 2450 uint32_t parent_cid = 0xffffffff; 2451 uint32_t number_heads = 16; 2452 uint32_t desc_offset = 0, desc_len; 2453 const char desc_template[] = 2454 "# Disk DescriptorFile\n" 2455 "version=1\n" 2456 "CID=%" PRIx32 "\n" 2457 "parentCID=%" PRIx32 "\n" 2458 "createType=\"%s\"\n" 2459 "%s" 2460 "\n" 2461 "# Extent description\n" 2462 "%s" 2463 "\n" 2464 "# The Disk Data Base\n" 2465 "#DDB\n" 2466 "\n" 2467 "ddb.virtualHWVersion = \"%s\"\n" 2468 "ddb.geometry.cylinders = \"%" PRId64 "\"\n" 2469 "ddb.geometry.heads = \"%" PRIu32 "\"\n" 2470 "ddb.geometry.sectors = \"63\"\n" 2471 "ddb.adapterType = \"%s\"\n" 2472 "ddb.toolsVersion = \"%s\"\n"; 2473 2474 ext_desc_lines = g_string_new(NULL); 2475 2476 /* Read out options */ 2477 if (compat6) { 2478 if (hw_version) { 2479 error_setg(errp, 2480 "compat6 cannot be enabled with hwversion set"); 2481 ret = -EINVAL; 2482 goto exit; 2483 } 2484 hw_version = "6"; 2485 } 2486 if (!hw_version) { 2487 hw_version = "4"; 2488 } 2489 if (!toolsversion) { 2490 toolsversion = "2147483647"; 2491 } 2492 2493 if (adapter_type != BLOCKDEV_VMDK_ADAPTER_TYPE_IDE) { 2494 /* that's the number of heads with which vmware operates when 2495 creating, exporting, etc. vmdk files with a non-ide adapter type */ 2496 number_heads = 255; 2497 } 2498 split = (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTFLAT) || 2499 (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTSPARSE); 2500 flat = (subformat == BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICFLAT) || 2501 (subformat == BLOCKDEV_VMDK_SUBFORMAT_TWOGBMAXEXTENTFLAT); 2502 compress = subformat == BLOCKDEV_VMDK_SUBFORMAT_STREAMOPTIMIZED; 2503 2504 if (flat) { 2505 extent_line_fmt = "RW %" PRId64 " FLAT \"%s\" 0\n"; 2506 } else { 2507 extent_line_fmt = "RW %" PRId64 " SPARSE \"%s\"\n"; 2508 } 2509 if (flat && backing_file) { 2510 error_setg(errp, "Flat image can't have backing file"); 2511 ret = -ENOTSUP; 2512 goto exit; 2513 } 2514 if (flat && zeroed_grain) { 2515 error_setg(errp, "Flat image can't enable zeroed grain"); 2516 ret = -ENOTSUP; 2517 goto exit; 2518 } 2519 2520 /* Create extents */ 2521 if (split) { 2522 extent_size = split_size; 2523 } else { 2524 extent_size = size; 2525 } 2526 if (!split && !flat) { 2527 created_size = extent_size; 2528 } else { 2529 created_size = 0; 2530 } 2531 /* Get the descriptor file BDS */ 2532 blk = extent_fn(created_size, 0, flat, split, compress, zeroed_grain, 2533 opaque, errp); 2534 if (!blk) { 2535 ret = -EIO; 2536 goto exit; 2537 } 2538 if (!split && !flat) { 2539 vmdk_desc_add_extent(ext_desc_lines, extent_line_fmt, created_size, 2540 blk_bs(blk)->filename); 2541 } 2542 2543 if (backing_file) { 2544 BlockBackend *backing; 2545 char *full_backing = 2546 bdrv_get_full_backing_filename_from_filename(blk_bs(blk)->filename, 2547 backing_file, 2548 &local_err); 2549 if (local_err) { 2550 error_propagate(errp, local_err); 2551 ret = -ENOENT; 2552 goto exit; 2553 } 2554 assert(full_backing); 2555 2556 backing = blk_co_new_open(full_backing, NULL, NULL, 2557 BDRV_O_NO_BACKING, errp); 2558 g_free(full_backing); 2559 if (backing == NULL) { 2560 ret = -EIO; 2561 goto exit; 2562 } 2563 if (strcmp(blk_bs(backing)->drv->format_name, "vmdk")) { 2564 error_setg(errp, "Invalid backing file format: %s. Must be vmdk", 2565 blk_bs(backing)->drv->format_name); 2566 blk_co_unref(backing); 2567 ret = -EINVAL; 2568 goto exit; 2569 } 2570 2571 bdrv_graph_co_rdlock(); 2572 ret = vmdk_read_cid(blk_bs(backing), 0, &parent_cid); 2573 bdrv_graph_co_rdunlock(); 2574 blk_co_unref(backing); 2575 if (ret) { 2576 error_setg(errp, "Failed to read parent CID"); 2577 goto exit; 2578 } 2579 snprintf(parent_desc_line, BUF_SIZE, 2580 "parentFileNameHint=\"%s\"", backing_file); 2581 } 2582 extent_idx = 1; 2583 while (created_size < size) { 2584 int64_t cur_size = MIN(size - created_size, extent_size); 2585 extent_blk = extent_fn(cur_size, extent_idx, flat, split, compress, 2586 zeroed_grain, opaque, errp); 2587 if (!extent_blk) { 2588 ret = -EINVAL; 2589 goto exit; 2590 } 2591 vmdk_desc_add_extent(ext_desc_lines, extent_line_fmt, cur_size, 2592 blk_bs(extent_blk)->filename); 2593 created_size += cur_size; 2594 extent_idx++; 2595 blk_co_unref(extent_blk); 2596 } 2597 2598 /* Check whether we got excess extents */ 2599 extent_blk = extent_fn(-1, extent_idx, flat, split, compress, zeroed_grain, 2600 opaque, NULL); 2601 if (extent_blk) { 2602 blk_co_unref(extent_blk); 2603 error_setg(errp, "List of extents contains unused extents"); 2604 ret = -EINVAL; 2605 goto exit; 2606 } 2607 2608 /* generate descriptor file */ 2609 desc = g_strdup_printf(desc_template, 2610 g_random_int(), 2611 parent_cid, 2612 BlockdevVmdkSubformat_str(subformat), 2613 parent_desc_line, 2614 ext_desc_lines->str, 2615 hw_version, 2616 size / 2617 (int64_t)(63 * number_heads * BDRV_SECTOR_SIZE), 2618 number_heads, 2619 BlockdevVmdkAdapterType_str(adapter_type), 2620 toolsversion); 2621 desc_len = strlen(desc); 2622 /* the descriptor offset = 0x200 */ 2623 if (!split && !flat) { 2624 desc_offset = 0x200; 2625 } 2626 2627 ret = blk_co_pwrite(blk, desc_offset, desc_len, desc, 0); 2628 if (ret < 0) { 2629 error_setg_errno(errp, -ret, "Could not write description"); 2630 goto exit; 2631 } 2632 /* bdrv_pwrite write padding zeros to align to sector, we don't need that 2633 * for description file */ 2634 if (desc_offset == 0) { 2635 ret = blk_co_truncate(blk, desc_len, false, PREALLOC_MODE_OFF, 0, errp); 2636 if (ret < 0) { 2637 goto exit; 2638 } 2639 } 2640 ret = 0; 2641 exit: 2642 if (blk) { 2643 blk_co_unref(blk); 2644 } 2645 g_free(desc); 2646 g_free(parent_desc_line); 2647 g_string_free(ext_desc_lines, true); 2648 return ret; 2649 } 2650 2651 typedef struct { 2652 char *path; 2653 char *prefix; 2654 char *postfix; 2655 QemuOpts *opts; 2656 } VMDKCreateOptsData; 2657 2658 static BlockBackend * coroutine_fn GRAPH_UNLOCKED 2659 vmdk_co_create_opts_cb(int64_t size, int idx, bool flat, bool split, 2660 bool compress, bool zeroed_grain, void *opaque, 2661 Error **errp) 2662 { 2663 BlockBackend *blk = NULL; 2664 BlockDriverState *bs = NULL; 2665 VMDKCreateOptsData *data = opaque; 2666 char *ext_filename = NULL; 2667 char *rel_filename = NULL; 2668 2669 /* We're done, don't create excess extents. */ 2670 if (size == -1) { 2671 assert(errp == NULL); 2672 return NULL; 2673 } 2674 2675 if (idx == 0) { 2676 rel_filename = g_strdup_printf("%s%s", data->prefix, data->postfix); 2677 } else if (split) { 2678 rel_filename = g_strdup_printf("%s-%c%03d%s", 2679 data->prefix, 2680 flat ? 'f' : 's', idx, data->postfix); 2681 } else { 2682 assert(idx == 1); 2683 rel_filename = g_strdup_printf("%s-flat%s", data->prefix, data->postfix); 2684 } 2685 2686 ext_filename = g_strdup_printf("%s%s", data->path, rel_filename); 2687 g_free(rel_filename); 2688 2689 if (vmdk_create_extent(ext_filename, size, 2690 flat, compress, zeroed_grain, &blk, data->opts, 2691 errp)) { 2692 goto exit; 2693 } 2694 bdrv_co_unref(bs); 2695 exit: 2696 g_free(ext_filename); 2697 return blk; 2698 } 2699 2700 static int coroutine_fn GRAPH_UNLOCKED 2701 vmdk_co_create_opts(BlockDriver *drv, const char *filename, 2702 QemuOpts *opts, Error **errp) 2703 { 2704 Error *local_err = NULL; 2705 char *desc = NULL; 2706 int64_t total_size = 0; 2707 char *adapter_type = NULL; 2708 BlockdevVmdkAdapterType adapter_type_enum; 2709 char *backing_file = NULL; 2710 char *hw_version = NULL; 2711 char *toolsversion = NULL; 2712 char *fmt = NULL; 2713 BlockdevVmdkSubformat subformat; 2714 int ret = 0; 2715 char *path = g_malloc0(PATH_MAX); 2716 char *prefix = g_malloc0(PATH_MAX); 2717 char *postfix = g_malloc0(PATH_MAX); 2718 char *desc_line = g_malloc0(BUF_SIZE); 2719 char *ext_filename = g_malloc0(PATH_MAX); 2720 char *desc_filename = g_malloc0(PATH_MAX); 2721 char *parent_desc_line = g_malloc0(BUF_SIZE); 2722 bool zeroed_grain; 2723 bool compat6; 2724 VMDKCreateOptsData data; 2725 char *backing_fmt = NULL; 2726 2727 backing_fmt = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FMT); 2728 if (backing_fmt && strcmp(backing_fmt, "vmdk") != 0) { 2729 error_setg(errp, "backing_file must be a vmdk image"); 2730 ret = -EINVAL; 2731 goto exit; 2732 } 2733 2734 if (filename_decompose(filename, path, prefix, postfix, PATH_MAX, errp)) { 2735 ret = -EINVAL; 2736 goto exit; 2737 } 2738 /* Read out options */ 2739 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 2740 BDRV_SECTOR_SIZE); 2741 adapter_type = qemu_opt_get_del(opts, BLOCK_OPT_ADAPTER_TYPE); 2742 backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE); 2743 hw_version = qemu_opt_get_del(opts, BLOCK_OPT_HWVERSION); 2744 toolsversion = qemu_opt_get_del(opts, BLOCK_OPT_TOOLSVERSION); 2745 compat6 = qemu_opt_get_bool_del(opts, BLOCK_OPT_COMPAT6, false); 2746 if (strcmp(hw_version, "undefined") == 0) { 2747 g_free(hw_version); 2748 hw_version = NULL; 2749 } 2750 fmt = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT); 2751 zeroed_grain = qemu_opt_get_bool_del(opts, BLOCK_OPT_ZEROED_GRAIN, false); 2752 2753 if (adapter_type) { 2754 adapter_type_enum = qapi_enum_parse(&BlockdevVmdkAdapterType_lookup, 2755 adapter_type, 2756 BLOCKDEV_VMDK_ADAPTER_TYPE_IDE, 2757 &local_err); 2758 if (local_err) { 2759 error_propagate(errp, local_err); 2760 ret = -EINVAL; 2761 goto exit; 2762 } 2763 } else { 2764 adapter_type_enum = BLOCKDEV_VMDK_ADAPTER_TYPE_IDE; 2765 } 2766 2767 if (!fmt) { 2768 /* Default format to monolithicSparse */ 2769 subformat = BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICSPARSE; 2770 } else { 2771 subformat = qapi_enum_parse(&BlockdevVmdkSubformat_lookup, 2772 fmt, 2773 BLOCKDEV_VMDK_SUBFORMAT_MONOLITHICSPARSE, 2774 &local_err); 2775 if (local_err) { 2776 error_propagate(errp, local_err); 2777 ret = -EINVAL; 2778 goto exit; 2779 } 2780 } 2781 data = (VMDKCreateOptsData){ 2782 .prefix = prefix, 2783 .postfix = postfix, 2784 .path = path, 2785 .opts = opts, 2786 }; 2787 ret = vmdk_co_do_create(total_size, subformat, adapter_type_enum, 2788 backing_file, hw_version, toolsversion, compat6, 2789 zeroed_grain, vmdk_co_create_opts_cb, &data, errp); 2790 2791 exit: 2792 g_free(backing_fmt); 2793 g_free(adapter_type); 2794 g_free(backing_file); 2795 g_free(hw_version); 2796 g_free(toolsversion); 2797 g_free(fmt); 2798 g_free(desc); 2799 g_free(path); 2800 g_free(prefix); 2801 g_free(postfix); 2802 g_free(desc_line); 2803 g_free(ext_filename); 2804 g_free(desc_filename); 2805 g_free(parent_desc_line); 2806 return ret; 2807 } 2808 2809 static BlockBackend * coroutine_fn GRAPH_UNLOCKED 2810 vmdk_co_create_cb(int64_t size, int idx, bool flat, bool split, bool compress, 2811 bool zeroed_grain, void *opaque, Error **errp) 2812 { 2813 int ret; 2814 BlockDriverState *bs; 2815 BlockBackend *blk; 2816 BlockdevCreateOptionsVmdk *opts = opaque; 2817 2818 if (idx == 0) { 2819 bs = bdrv_co_open_blockdev_ref(opts->file, errp); 2820 } else { 2821 int i; 2822 BlockdevRefList *list = opts->extents; 2823 for (i = 1; i < idx; i++) { 2824 if (!list || !list->next) { 2825 error_setg(errp, "Extent [%d] not specified", i); 2826 return NULL; 2827 } 2828 list = list->next; 2829 } 2830 if (!list) { 2831 error_setg(errp, "Extent [%d] not specified", idx - 1); 2832 return NULL; 2833 } 2834 bs = bdrv_co_open_blockdev_ref(list->value, errp); 2835 } 2836 if (!bs) { 2837 return NULL; 2838 } 2839 blk = blk_co_new_with_bs(bs, 2840 BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE | 2841 BLK_PERM_RESIZE, 2842 BLK_PERM_ALL, 2843 errp); 2844 if (!blk) { 2845 return NULL; 2846 } 2847 blk_set_allow_write_beyond_eof(blk, true); 2848 bdrv_co_unref(bs); 2849 2850 if (size != -1) { 2851 ret = vmdk_init_extent(blk, size, flat, compress, zeroed_grain, errp); 2852 if (ret) { 2853 blk_co_unref(blk); 2854 blk = NULL; 2855 } 2856 } 2857 return blk; 2858 } 2859 2860 static int coroutine_fn GRAPH_UNLOCKED 2861 vmdk_co_create(BlockdevCreateOptions *create_options, Error **errp) 2862 { 2863 BlockdevCreateOptionsVmdk *opts; 2864 2865 opts = &create_options->u.vmdk; 2866 2867 /* Validate options */ 2868 if (!QEMU_IS_ALIGNED(opts->size, BDRV_SECTOR_SIZE)) { 2869 error_setg(errp, "Image size must be a multiple of 512 bytes"); 2870 return -EINVAL; 2871 } 2872 2873 return vmdk_co_do_create(opts->size, 2874 opts->subformat, 2875 opts->adapter_type, 2876 opts->backing_file, 2877 opts->hwversion, 2878 opts->toolsversion, 2879 false, 2880 opts->zeroed_grain, 2881 vmdk_co_create_cb, 2882 opts, errp); 2883 } 2884 2885 static void vmdk_close(BlockDriverState *bs) 2886 { 2887 BDRVVmdkState *s = bs->opaque; 2888 2889 vmdk_free_extents(bs); 2890 g_free(s->create_type); 2891 2892 migrate_del_blocker(&s->migration_blocker); 2893 } 2894 2895 static int64_t coroutine_fn GRAPH_RDLOCK 2896 vmdk_co_get_allocated_file_size(BlockDriverState *bs) 2897 { 2898 int i; 2899 int64_t ret = 0; 2900 int64_t r; 2901 BDRVVmdkState *s = bs->opaque; 2902 2903 ret = bdrv_co_get_allocated_file_size(bs->file->bs); 2904 if (ret < 0) { 2905 return ret; 2906 } 2907 for (i = 0; i < s->num_extents; i++) { 2908 if (s->extents[i].file == bs->file) { 2909 continue; 2910 } 2911 r = bdrv_co_get_allocated_file_size(s->extents[i].file->bs); 2912 if (r < 0) { 2913 return r; 2914 } 2915 ret += r; 2916 } 2917 return ret; 2918 } 2919 2920 static int GRAPH_RDLOCK vmdk_has_zero_init(BlockDriverState *bs) 2921 { 2922 int i; 2923 BDRVVmdkState *s = bs->opaque; 2924 2925 /* If has a flat extent and its underlying storage doesn't have zero init, 2926 * return 0. */ 2927 for (i = 0; i < s->num_extents; i++) { 2928 if (s->extents[i].flat) { 2929 if (!bdrv_has_zero_init(s->extents[i].file->bs)) { 2930 return 0; 2931 } 2932 } 2933 } 2934 return 1; 2935 } 2936 2937 static VmdkExtentInfo * GRAPH_RDLOCK vmdk_get_extent_info(VmdkExtent *extent) 2938 { 2939 VmdkExtentInfo *info = g_new0(VmdkExtentInfo, 1); 2940 2941 bdrv_refresh_filename(extent->file->bs); 2942 *info = (VmdkExtentInfo){ 2943 .filename = g_strdup(extent->file->bs->filename), 2944 .format = g_strdup(extent->type), 2945 .virtual_size = extent->sectors * BDRV_SECTOR_SIZE, 2946 .compressed = extent->compressed, 2947 .has_compressed = extent->compressed, 2948 .cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE, 2949 .has_cluster_size = !extent->flat, 2950 }; 2951 2952 return info; 2953 } 2954 2955 static int coroutine_fn GRAPH_RDLOCK 2956 vmdk_co_check(BlockDriverState *bs, BdrvCheckResult *result, BdrvCheckMode fix) 2957 { 2958 BDRVVmdkState *s = bs->opaque; 2959 VmdkExtent *extent = NULL; 2960 int64_t sector_num = 0; 2961 int64_t total_sectors = bdrv_co_nb_sectors(bs); 2962 int ret; 2963 uint64_t cluster_offset; 2964 2965 if (fix) { 2966 return -ENOTSUP; 2967 } 2968 2969 for (;;) { 2970 if (sector_num >= total_sectors) { 2971 return 0; 2972 } 2973 extent = find_extent(s, sector_num, extent); 2974 if (!extent) { 2975 fprintf(stderr, 2976 "ERROR: could not find extent for sector %" PRId64 "\n", 2977 sector_num); 2978 ret = -EINVAL; 2979 break; 2980 } 2981 ret = get_cluster_offset(bs, extent, NULL, 2982 sector_num << BDRV_SECTOR_BITS, 2983 false, &cluster_offset, 0, 0); 2984 if (ret == VMDK_ERROR) { 2985 fprintf(stderr, 2986 "ERROR: could not get cluster_offset for sector %" 2987 PRId64 "\n", sector_num); 2988 break; 2989 } 2990 if (ret == VMDK_OK) { 2991 int64_t extent_len = bdrv_co_getlength(extent->file->bs); 2992 if (extent_len < 0) { 2993 fprintf(stderr, 2994 "ERROR: could not get extent file length for sector %" 2995 PRId64 "\n", sector_num); 2996 ret = extent_len; 2997 break; 2998 } 2999 if (cluster_offset >= extent_len) { 3000 fprintf(stderr, 3001 "ERROR: cluster offset for sector %" 3002 PRId64 " points after EOF\n", sector_num); 3003 ret = -EINVAL; 3004 break; 3005 } 3006 } 3007 sector_num += extent->cluster_sectors; 3008 } 3009 3010 result->corruptions++; 3011 return ret; 3012 } 3013 3014 static ImageInfoSpecific * GRAPH_RDLOCK 3015 vmdk_get_specific_info(BlockDriverState *bs, Error **errp) 3016 { 3017 int i; 3018 BDRVVmdkState *s = bs->opaque; 3019 ImageInfoSpecific *spec_info = g_new0(ImageInfoSpecific, 1); 3020 VmdkExtentInfoList **tail; 3021 3022 *spec_info = (ImageInfoSpecific){ 3023 .type = IMAGE_INFO_SPECIFIC_KIND_VMDK, 3024 .u = { 3025 .vmdk.data = g_new0(ImageInfoSpecificVmdk, 1), 3026 }, 3027 }; 3028 3029 *spec_info->u.vmdk.data = (ImageInfoSpecificVmdk) { 3030 .create_type = g_strdup(s->create_type), 3031 .cid = s->cid, 3032 .parent_cid = s->parent_cid, 3033 }; 3034 3035 tail = &spec_info->u.vmdk.data->extents; 3036 for (i = 0; i < s->num_extents; i++) { 3037 QAPI_LIST_APPEND(tail, vmdk_get_extent_info(&s->extents[i])); 3038 } 3039 3040 return spec_info; 3041 } 3042 3043 static bool vmdk_extents_type_eq(const VmdkExtent *a, const VmdkExtent *b) 3044 { 3045 return a->flat == b->flat && 3046 a->compressed == b->compressed && 3047 (a->flat || a->cluster_sectors == b->cluster_sectors); 3048 } 3049 3050 static int coroutine_fn 3051 vmdk_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) 3052 { 3053 int i; 3054 BDRVVmdkState *s = bs->opaque; 3055 assert(s->num_extents); 3056 3057 /* See if we have multiple extents but they have different cases */ 3058 for (i = 1; i < s->num_extents; i++) { 3059 if (!vmdk_extents_type_eq(&s->extents[0], &s->extents[i])) { 3060 return -ENOTSUP; 3061 } 3062 } 3063 bdi->needs_compressed_writes = s->extents[0].compressed; 3064 if (!s->extents[0].flat) { 3065 bdi->cluster_size = s->extents[0].cluster_sectors << BDRV_SECTOR_BITS; 3066 } 3067 return 0; 3068 } 3069 3070 static void GRAPH_RDLOCK 3071 vmdk_gather_child_options(BlockDriverState *bs, QDict *target, 3072 bool backing_overridden) 3073 { 3074 /* No children but file and backing can be explicitly specified (TODO) */ 3075 qdict_put(target, "file", 3076 qobject_ref(bs->file->bs->full_open_options)); 3077 3078 if (backing_overridden) { 3079 if (bs->backing) { 3080 qdict_put(target, "backing", 3081 qobject_ref(bs->backing->bs->full_open_options)); 3082 } else { 3083 qdict_put_null(target, "backing"); 3084 } 3085 } 3086 } 3087 3088 static QemuOptsList vmdk_create_opts = { 3089 .name = "vmdk-create-opts", 3090 .head = QTAILQ_HEAD_INITIALIZER(vmdk_create_opts.head), 3091 .desc = { 3092 { 3093 .name = BLOCK_OPT_SIZE, 3094 .type = QEMU_OPT_SIZE, 3095 .help = "Virtual disk size" 3096 }, 3097 { 3098 .name = BLOCK_OPT_ADAPTER_TYPE, 3099 .type = QEMU_OPT_STRING, 3100 .help = "Virtual adapter type, can be one of " 3101 "ide (default), lsilogic, buslogic or legacyESX" 3102 }, 3103 { 3104 .name = BLOCK_OPT_BACKING_FILE, 3105 .type = QEMU_OPT_STRING, 3106 .help = "File name of a base image" 3107 }, 3108 { 3109 .name = BLOCK_OPT_BACKING_FMT, 3110 .type = QEMU_OPT_STRING, 3111 .help = "Must be 'vmdk' if present", 3112 }, 3113 { 3114 .name = BLOCK_OPT_COMPAT6, 3115 .type = QEMU_OPT_BOOL, 3116 .help = "VMDK version 6 image", 3117 .def_value_str = "off" 3118 }, 3119 { 3120 .name = BLOCK_OPT_HWVERSION, 3121 .type = QEMU_OPT_STRING, 3122 .help = "VMDK hardware version", 3123 .def_value_str = "undefined" 3124 }, 3125 { 3126 .name = BLOCK_OPT_TOOLSVERSION, 3127 .type = QEMU_OPT_STRING, 3128 .help = "VMware guest tools version", 3129 }, 3130 { 3131 .name = BLOCK_OPT_SUBFMT, 3132 .type = QEMU_OPT_STRING, 3133 .help = 3134 "VMDK flat extent format, can be one of " 3135 "{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} " 3136 }, 3137 { 3138 .name = BLOCK_OPT_ZEROED_GRAIN, 3139 .type = QEMU_OPT_BOOL, 3140 .help = "Enable efficient zero writes " 3141 "using the zeroed-grain GTE feature" 3142 }, 3143 { /* end of list */ } 3144 } 3145 }; 3146 3147 static BlockDriver bdrv_vmdk = { 3148 .format_name = "vmdk", 3149 .instance_size = sizeof(BDRVVmdkState), 3150 .bdrv_probe = vmdk_probe, 3151 .bdrv_open = vmdk_open, 3152 .bdrv_co_check = vmdk_co_check, 3153 .bdrv_reopen_prepare = vmdk_reopen_prepare, 3154 .bdrv_reopen_commit = vmdk_reopen_commit, 3155 .bdrv_reopen_abort = vmdk_reopen_abort, 3156 .bdrv_child_perm = bdrv_default_perms, 3157 .bdrv_co_preadv = vmdk_co_preadv, 3158 .bdrv_co_pwritev = vmdk_co_pwritev, 3159 .bdrv_co_pwritev_compressed = vmdk_co_pwritev_compressed, 3160 .bdrv_co_pwrite_zeroes = vmdk_co_pwrite_zeroes, 3161 .bdrv_close = vmdk_close, 3162 .bdrv_co_create_opts = vmdk_co_create_opts, 3163 .bdrv_co_create = vmdk_co_create, 3164 .bdrv_co_block_status = vmdk_co_block_status, 3165 .bdrv_co_get_allocated_file_size = vmdk_co_get_allocated_file_size, 3166 .bdrv_has_zero_init = vmdk_has_zero_init, 3167 .bdrv_get_specific_info = vmdk_get_specific_info, 3168 .bdrv_refresh_limits = vmdk_refresh_limits, 3169 .bdrv_co_get_info = vmdk_co_get_info, 3170 .bdrv_gather_child_options = vmdk_gather_child_options, 3171 3172 .is_format = true, 3173 .supports_backing = true, 3174 .create_opts = &vmdk_create_opts, 3175 }; 3176 3177 static void bdrv_vmdk_init(void) 3178 { 3179 bdrv_register(&bdrv_vmdk); 3180 } 3181 3182 block_init(bdrv_vmdk_init); 3183