1 /* 2 * Block driver for Parallels disk image format 3 * 4 * Copyright (c) 2007 Alex Beregszaszi 5 * Copyright (c) 2015 Denis V. Lunev <den@openvz.org> 6 * 7 * This code was originally based on comparing different disk images created 8 * by Parallels. Currently it is based on opened OpenVZ sources 9 * available at 10 * http://git.openvz.org/?p=ploop;a=summary 11 * 12 * Permission is hereby granted, free of charge, to any person obtaining a copy 13 * of this software and associated documentation files (the "Software"), to deal 14 * in the Software without restriction, including without limitation the rights 15 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 16 * copies of the Software, and to permit persons to whom the Software is 17 * furnished to do so, subject to the following conditions: 18 * 19 * The above copyright notice and this permission notice shall be included in 20 * all copies or substantial portions of the Software. 21 * 22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 25 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 26 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 27 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 28 * THE SOFTWARE. 29 */ 30 #include "qemu/osdep.h" 31 #include "qapi/error.h" 32 #include "qemu-common.h" 33 #include "block/block_int.h" 34 #include "sysemu/block-backend.h" 35 #include "qemu/module.h" 36 #include "qemu/bswap.h" 37 #include "qemu/bitmap.h" 38 #include "qapi/util.h" 39 40 /**************************************************************/ 41 42 #define HEADER_MAGIC "WithoutFreeSpace" 43 #define HEADER_MAGIC2 "WithouFreSpacExt" 44 #define HEADER_VERSION 2 45 #define HEADER_INUSE_MAGIC (0x746F6E59) 46 #define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32) 47 48 #define DEFAULT_CLUSTER_SIZE 1048576 /* 1 MiB */ 49 50 51 // always little-endian 52 typedef struct ParallelsHeader { 53 char magic[16]; // "WithoutFreeSpace" 54 uint32_t version; 55 uint32_t heads; 56 uint32_t cylinders; 57 uint32_t tracks; 58 uint32_t bat_entries; 59 uint64_t nb_sectors; 60 uint32_t inuse; 61 uint32_t data_off; 62 char padding[12]; 63 } QEMU_PACKED ParallelsHeader; 64 65 66 typedef enum ParallelsPreallocMode { 67 PRL_PREALLOC_MODE_FALLOCATE = 0, 68 PRL_PREALLOC_MODE_TRUNCATE = 1, 69 PRL_PREALLOC_MODE__MAX = 2, 70 } ParallelsPreallocMode; 71 72 static const char *prealloc_mode_lookup[] = { 73 "falloc", 74 "truncate", 75 NULL, 76 }; 77 78 79 typedef struct BDRVParallelsState { 80 /** Locking is conservative, the lock protects 81 * - image file extending (truncate, fallocate) 82 * - any access to block allocation table 83 */ 84 CoMutex lock; 85 86 ParallelsHeader *header; 87 uint32_t header_size; 88 bool header_unclean; 89 90 unsigned long *bat_dirty_bmap; 91 unsigned int bat_dirty_block; 92 93 uint32_t *bat_bitmap; 94 unsigned int bat_size; 95 96 int64_t data_end; 97 uint64_t prealloc_size; 98 ParallelsPreallocMode prealloc_mode; 99 100 unsigned int tracks; 101 102 unsigned int off_multiplier; 103 } BDRVParallelsState; 104 105 106 #define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode" 107 #define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size" 108 109 static QemuOptsList parallels_runtime_opts = { 110 .name = "parallels", 111 .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head), 112 .desc = { 113 { 114 .name = PARALLELS_OPT_PREALLOC_SIZE, 115 .type = QEMU_OPT_SIZE, 116 .help = "Preallocation size on image expansion", 117 .def_value_str = "128MiB", 118 }, 119 { 120 .name = PARALLELS_OPT_PREALLOC_MODE, 121 .type = QEMU_OPT_STRING, 122 .help = "Preallocation mode on image expansion " 123 "(allowed values: falloc, truncate)", 124 .def_value_str = "falloc", 125 }, 126 { /* end of list */ }, 127 }, 128 }; 129 130 131 static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx) 132 { 133 return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier; 134 } 135 136 static uint32_t bat_entry_off(uint32_t idx) 137 { 138 return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx; 139 } 140 141 static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num) 142 { 143 uint32_t index, offset; 144 145 index = sector_num / s->tracks; 146 offset = sector_num % s->tracks; 147 148 /* not allocated */ 149 if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) { 150 return -1; 151 } 152 return bat2sect(s, index) + offset; 153 } 154 155 static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num, 156 int nb_sectors) 157 { 158 int ret = s->tracks - sector_num % s->tracks; 159 return MIN(nb_sectors, ret); 160 } 161 162 static int64_t block_status(BDRVParallelsState *s, int64_t sector_num, 163 int nb_sectors, int *pnum) 164 { 165 int64_t start_off = -2, prev_end_off = -2; 166 167 *pnum = 0; 168 while (nb_sectors > 0 || start_off == -2) { 169 int64_t offset = seek_to_sector(s, sector_num); 170 int to_end; 171 172 if (start_off == -2) { 173 start_off = offset; 174 prev_end_off = offset; 175 } else if (offset != prev_end_off) { 176 break; 177 } 178 179 to_end = cluster_remainder(s, sector_num, nb_sectors); 180 nb_sectors -= to_end; 181 sector_num += to_end; 182 *pnum += to_end; 183 184 if (offset > 0) { 185 prev_end_off += to_end; 186 } 187 } 188 return start_off; 189 } 190 191 static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num, 192 int nb_sectors, int *pnum) 193 { 194 BDRVParallelsState *s = bs->opaque; 195 uint32_t idx, to_allocate, i; 196 int64_t pos, space; 197 198 pos = block_status(s, sector_num, nb_sectors, pnum); 199 if (pos > 0) { 200 return pos; 201 } 202 203 idx = sector_num / s->tracks; 204 if (idx >= s->bat_size) { 205 return -EINVAL; 206 } 207 208 to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx; 209 space = to_allocate * s->tracks; 210 if (s->data_end + space > bdrv_getlength(bs->file->bs) >> BDRV_SECTOR_BITS) { 211 int ret; 212 space += s->prealloc_size; 213 if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) { 214 ret = bdrv_pwrite_zeroes(bs->file, 215 s->data_end << BDRV_SECTOR_BITS, 216 space << BDRV_SECTOR_BITS, 0); 217 } else { 218 ret = bdrv_truncate(bs->file, 219 (s->data_end + space) << BDRV_SECTOR_BITS); 220 } 221 if (ret < 0) { 222 return ret; 223 } 224 } 225 226 for (i = 0; i < to_allocate; i++) { 227 s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier); 228 s->data_end += s->tracks; 229 bitmap_set(s->bat_dirty_bmap, 230 bat_entry_off(idx + i) / s->bat_dirty_block, 1); 231 } 232 233 return bat2sect(s, idx) + sector_num % s->tracks; 234 } 235 236 237 static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs) 238 { 239 BDRVParallelsState *s = bs->opaque; 240 unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block); 241 unsigned long bit; 242 243 qemu_co_mutex_lock(&s->lock); 244 245 bit = find_first_bit(s->bat_dirty_bmap, size); 246 while (bit < size) { 247 uint32_t off = bit * s->bat_dirty_block; 248 uint32_t to_write = s->bat_dirty_block; 249 int ret; 250 251 if (off + to_write > s->header_size) { 252 to_write = s->header_size - off; 253 } 254 ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off, 255 to_write); 256 if (ret < 0) { 257 qemu_co_mutex_unlock(&s->lock); 258 return ret; 259 } 260 bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1); 261 } 262 bitmap_zero(s->bat_dirty_bmap, size); 263 264 qemu_co_mutex_unlock(&s->lock); 265 return 0; 266 } 267 268 269 static int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs, 270 int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) 271 { 272 BDRVParallelsState *s = bs->opaque; 273 int64_t offset; 274 275 qemu_co_mutex_lock(&s->lock); 276 offset = block_status(s, sector_num, nb_sectors, pnum); 277 qemu_co_mutex_unlock(&s->lock); 278 279 if (offset < 0) { 280 return 0; 281 } 282 283 *file = bs->file->bs; 284 return (offset << BDRV_SECTOR_BITS) | 285 BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 286 } 287 288 static coroutine_fn int parallels_co_writev(BlockDriverState *bs, 289 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) 290 { 291 BDRVParallelsState *s = bs->opaque; 292 uint64_t bytes_done = 0; 293 QEMUIOVector hd_qiov; 294 int ret = 0; 295 296 qemu_iovec_init(&hd_qiov, qiov->niov); 297 298 while (nb_sectors > 0) { 299 int64_t position; 300 int n, nbytes; 301 302 qemu_co_mutex_lock(&s->lock); 303 position = allocate_clusters(bs, sector_num, nb_sectors, &n); 304 qemu_co_mutex_unlock(&s->lock); 305 if (position < 0) { 306 ret = (int)position; 307 break; 308 } 309 310 nbytes = n << BDRV_SECTOR_BITS; 311 312 qemu_iovec_reset(&hd_qiov); 313 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 314 315 ret = bdrv_co_writev(bs->file, position, n, &hd_qiov); 316 if (ret < 0) { 317 break; 318 } 319 320 nb_sectors -= n; 321 sector_num += n; 322 bytes_done += nbytes; 323 } 324 325 qemu_iovec_destroy(&hd_qiov); 326 return ret; 327 } 328 329 static coroutine_fn int parallels_co_readv(BlockDriverState *bs, 330 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) 331 { 332 BDRVParallelsState *s = bs->opaque; 333 uint64_t bytes_done = 0; 334 QEMUIOVector hd_qiov; 335 int ret = 0; 336 337 qemu_iovec_init(&hd_qiov, qiov->niov); 338 339 while (nb_sectors > 0) { 340 int64_t position; 341 int n, nbytes; 342 343 qemu_co_mutex_lock(&s->lock); 344 position = block_status(s, sector_num, nb_sectors, &n); 345 qemu_co_mutex_unlock(&s->lock); 346 347 nbytes = n << BDRV_SECTOR_BITS; 348 349 if (position < 0) { 350 qemu_iovec_memset(qiov, bytes_done, 0, nbytes); 351 } else { 352 qemu_iovec_reset(&hd_qiov); 353 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 354 355 ret = bdrv_co_readv(bs->file, position, n, &hd_qiov); 356 if (ret < 0) { 357 break; 358 } 359 } 360 361 nb_sectors -= n; 362 sector_num += n; 363 bytes_done += nbytes; 364 } 365 366 qemu_iovec_destroy(&hd_qiov); 367 return ret; 368 } 369 370 371 static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res, 372 BdrvCheckMode fix) 373 { 374 BDRVParallelsState *s = bs->opaque; 375 int64_t size, prev_off, high_off; 376 int ret; 377 uint32_t i; 378 bool flush_bat = false; 379 int cluster_size = s->tracks << BDRV_SECTOR_BITS; 380 381 size = bdrv_getlength(bs->file->bs); 382 if (size < 0) { 383 res->check_errors++; 384 return size; 385 } 386 387 if (s->header_unclean) { 388 fprintf(stderr, "%s image was not closed correctly\n", 389 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR"); 390 res->corruptions++; 391 if (fix & BDRV_FIX_ERRORS) { 392 /* parallels_close will do the job right */ 393 res->corruptions_fixed++; 394 s->header_unclean = false; 395 } 396 } 397 398 res->bfi.total_clusters = s->bat_size; 399 res->bfi.compressed_clusters = 0; /* compression is not supported */ 400 401 high_off = 0; 402 prev_off = 0; 403 for (i = 0; i < s->bat_size; i++) { 404 int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS; 405 if (off == 0) { 406 prev_off = 0; 407 continue; 408 } 409 410 /* cluster outside the image */ 411 if (off > size) { 412 fprintf(stderr, "%s cluster %u is outside image\n", 413 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); 414 res->corruptions++; 415 if (fix & BDRV_FIX_ERRORS) { 416 prev_off = 0; 417 s->bat_bitmap[i] = 0; 418 res->corruptions_fixed++; 419 flush_bat = true; 420 continue; 421 } 422 } 423 424 res->bfi.allocated_clusters++; 425 if (off > high_off) { 426 high_off = off; 427 } 428 429 if (prev_off != 0 && (prev_off + cluster_size) != off) { 430 res->bfi.fragmented_clusters++; 431 } 432 prev_off = off; 433 } 434 435 if (flush_bat) { 436 ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size); 437 if (ret < 0) { 438 res->check_errors++; 439 return ret; 440 } 441 } 442 443 res->image_end_offset = high_off + cluster_size; 444 if (size > res->image_end_offset) { 445 int64_t count; 446 count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size); 447 fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n", 448 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR", 449 size - res->image_end_offset); 450 res->leaks += count; 451 if (fix & BDRV_FIX_LEAKS) { 452 ret = bdrv_truncate(bs->file, res->image_end_offset); 453 if (ret < 0) { 454 res->check_errors++; 455 return ret; 456 } 457 res->leaks_fixed += count; 458 } 459 } 460 461 return 0; 462 } 463 464 465 static int parallels_create(const char *filename, QemuOpts *opts, Error **errp) 466 { 467 int64_t total_size, cl_size; 468 uint8_t tmp[BDRV_SECTOR_SIZE]; 469 Error *local_err = NULL; 470 BlockBackend *file; 471 uint32_t bat_entries, bat_sectors; 472 ParallelsHeader header; 473 int ret; 474 475 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 476 BDRV_SECTOR_SIZE); 477 cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE, 478 DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE); 479 if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) { 480 error_propagate(errp, local_err); 481 return -E2BIG; 482 } 483 484 ret = bdrv_create_file(filename, opts, &local_err); 485 if (ret < 0) { 486 error_propagate(errp, local_err); 487 return ret; 488 } 489 490 file = blk_new_open(filename, NULL, NULL, 491 BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err); 492 if (file == NULL) { 493 error_propagate(errp, local_err); 494 return -EIO; 495 } 496 497 blk_set_allow_write_beyond_eof(file, true); 498 499 ret = blk_truncate(file, 0); 500 if (ret < 0) { 501 goto exit; 502 } 503 504 bat_entries = DIV_ROUND_UP(total_size, cl_size); 505 bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size); 506 bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS; 507 508 memset(&header, 0, sizeof(header)); 509 memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic)); 510 header.version = cpu_to_le32(HEADER_VERSION); 511 /* don't care much about geometry, it is not used on image level */ 512 header.heads = cpu_to_le32(16); 513 header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE / 16 / 32); 514 header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS); 515 header.bat_entries = cpu_to_le32(bat_entries); 516 header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE)); 517 header.data_off = cpu_to_le32(bat_sectors); 518 519 /* write all the data */ 520 memset(tmp, 0, sizeof(tmp)); 521 memcpy(tmp, &header, sizeof(header)); 522 523 ret = blk_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE, 0); 524 if (ret < 0) { 525 goto exit; 526 } 527 ret = blk_pwrite_zeroes(file, BDRV_SECTOR_SIZE, 528 (bat_sectors - 1) << BDRV_SECTOR_BITS, 0); 529 if (ret < 0) { 530 goto exit; 531 } 532 ret = 0; 533 534 done: 535 blk_unref(file); 536 return ret; 537 538 exit: 539 error_setg_errno(errp, -ret, "Failed to create Parallels image"); 540 goto done; 541 } 542 543 544 static int parallels_probe(const uint8_t *buf, int buf_size, 545 const char *filename) 546 { 547 const ParallelsHeader *ph = (const void *)buf; 548 549 if (buf_size < sizeof(ParallelsHeader)) { 550 return 0; 551 } 552 553 if ((!memcmp(ph->magic, HEADER_MAGIC, 16) || 554 !memcmp(ph->magic, HEADER_MAGIC2, 16)) && 555 (le32_to_cpu(ph->version) == HEADER_VERSION)) { 556 return 100; 557 } 558 559 return 0; 560 } 561 562 static int parallels_update_header(BlockDriverState *bs) 563 { 564 BDRVParallelsState *s = bs->opaque; 565 unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs), 566 sizeof(ParallelsHeader)); 567 568 if (size > s->header_size) { 569 size = s->header_size; 570 } 571 return bdrv_pwrite_sync(bs->file, 0, s->header, size); 572 } 573 574 static int parallels_open(BlockDriverState *bs, QDict *options, int flags, 575 Error **errp) 576 { 577 BDRVParallelsState *s = bs->opaque; 578 ParallelsHeader ph; 579 int ret, size, i; 580 QemuOpts *opts = NULL; 581 Error *local_err = NULL; 582 char *buf; 583 584 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 585 false, errp); 586 if (!bs->file) { 587 return -EINVAL; 588 } 589 590 ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph)); 591 if (ret < 0) { 592 goto fail; 593 } 594 595 bs->total_sectors = le64_to_cpu(ph.nb_sectors); 596 597 if (le32_to_cpu(ph.version) != HEADER_VERSION) { 598 goto fail_format; 599 } 600 if (!memcmp(ph.magic, HEADER_MAGIC, 16)) { 601 s->off_multiplier = 1; 602 bs->total_sectors = 0xffffffff & bs->total_sectors; 603 } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) { 604 s->off_multiplier = le32_to_cpu(ph.tracks); 605 } else { 606 goto fail_format; 607 } 608 609 s->tracks = le32_to_cpu(ph.tracks); 610 if (s->tracks == 0) { 611 error_setg(errp, "Invalid image: Zero sectors per track"); 612 ret = -EINVAL; 613 goto fail; 614 } 615 if (s->tracks > INT32_MAX/513) { 616 error_setg(errp, "Invalid image: Too big cluster"); 617 ret = -EFBIG; 618 goto fail; 619 } 620 621 s->bat_size = le32_to_cpu(ph.bat_entries); 622 if (s->bat_size > INT_MAX / sizeof(uint32_t)) { 623 error_setg(errp, "Catalog too large"); 624 ret = -EFBIG; 625 goto fail; 626 } 627 628 size = bat_entry_off(s->bat_size); 629 s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs)); 630 s->header = qemu_try_blockalign(bs->file->bs, s->header_size); 631 if (s->header == NULL) { 632 ret = -ENOMEM; 633 goto fail; 634 } 635 s->data_end = le32_to_cpu(ph.data_off); 636 if (s->data_end == 0) { 637 s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE); 638 } 639 if (s->data_end < s->header_size) { 640 /* there is not enough unused space to fit to block align between BAT 641 and actual data. We can't avoid read-modify-write... */ 642 s->header_size = size; 643 } 644 645 ret = bdrv_pread(bs->file, 0, s->header, s->header_size); 646 if (ret < 0) { 647 goto fail; 648 } 649 s->bat_bitmap = (uint32_t *)(s->header + 1); 650 651 for (i = 0; i < s->bat_size; i++) { 652 int64_t off = bat2sect(s, i); 653 if (off >= s->data_end) { 654 s->data_end = off + s->tracks; 655 } 656 } 657 658 if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) { 659 /* Image was not closed correctly. The check is mandatory */ 660 s->header_unclean = true; 661 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { 662 error_setg(errp, "parallels: Image was not closed correctly; " 663 "cannot be opened read/write"); 664 ret = -EACCES; 665 goto fail; 666 } 667 } 668 669 opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, &local_err); 670 if (local_err != NULL) { 671 goto fail_options; 672 } 673 674 qemu_opts_absorb_qdict(opts, options, &local_err); 675 if (local_err != NULL) { 676 goto fail_options; 677 } 678 679 s->prealloc_size = 680 qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0); 681 s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS); 682 buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE); 683 s->prealloc_mode = qapi_enum_parse(prealloc_mode_lookup, buf, 684 PRL_PREALLOC_MODE__MAX, PRL_PREALLOC_MODE_FALLOCATE, &local_err); 685 g_free(buf); 686 if (local_err != NULL) { 687 goto fail_options; 688 } 689 if (!bdrv_has_zero_init(bs->file->bs) || 690 bdrv_truncate(bs->file, bdrv_getlength(bs->file->bs)) != 0) { 691 s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE; 692 } 693 694 if (flags & BDRV_O_RDWR) { 695 s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC); 696 ret = parallels_update_header(bs); 697 if (ret < 0) { 698 goto fail; 699 } 700 } 701 702 s->bat_dirty_block = 4 * getpagesize(); 703 s->bat_dirty_bmap = 704 bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block)); 705 706 qemu_co_mutex_init(&s->lock); 707 return 0; 708 709 fail_format: 710 error_setg(errp, "Image not in Parallels format"); 711 ret = -EINVAL; 712 fail: 713 qemu_vfree(s->header); 714 return ret; 715 716 fail_options: 717 error_propagate(errp, local_err); 718 ret = -EINVAL; 719 goto fail; 720 } 721 722 723 static void parallels_close(BlockDriverState *bs) 724 { 725 BDRVParallelsState *s = bs->opaque; 726 727 if (bs->open_flags & BDRV_O_RDWR) { 728 s->header->inuse = 0; 729 parallels_update_header(bs); 730 } 731 732 if (bs->open_flags & BDRV_O_RDWR) { 733 bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS); 734 } 735 736 g_free(s->bat_dirty_bmap); 737 qemu_vfree(s->header); 738 } 739 740 static QemuOptsList parallels_create_opts = { 741 .name = "parallels-create-opts", 742 .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head), 743 .desc = { 744 { 745 .name = BLOCK_OPT_SIZE, 746 .type = QEMU_OPT_SIZE, 747 .help = "Virtual disk size", 748 }, 749 { 750 .name = BLOCK_OPT_CLUSTER_SIZE, 751 .type = QEMU_OPT_SIZE, 752 .help = "Parallels image cluster size", 753 .def_value_str = stringify(DEFAULT_CLUSTER_SIZE), 754 }, 755 { /* end of list */ } 756 } 757 }; 758 759 static BlockDriver bdrv_parallels = { 760 .format_name = "parallels", 761 .instance_size = sizeof(BDRVParallelsState), 762 .bdrv_probe = parallels_probe, 763 .bdrv_open = parallels_open, 764 .bdrv_close = parallels_close, 765 .bdrv_co_get_block_status = parallels_co_get_block_status, 766 .bdrv_has_zero_init = bdrv_has_zero_init_1, 767 .bdrv_co_flush_to_os = parallels_co_flush_to_os, 768 .bdrv_co_readv = parallels_co_readv, 769 .bdrv_co_writev = parallels_co_writev, 770 771 .bdrv_create = parallels_create, 772 .bdrv_check = parallels_check, 773 .create_opts = ¶llels_create_opts, 774 }; 775 776 static void bdrv_parallels_init(void) 777 { 778 bdrv_register(&bdrv_parallels); 779 } 780 781 block_init(bdrv_parallels_init); 782