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 = "128M", 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 int64_t pos, space, idx, to_allocate, i, len; 196 197 pos = block_status(s, sector_num, nb_sectors, pnum); 198 if (pos > 0) { 199 return pos; 200 } 201 202 idx = sector_num / s->tracks; 203 to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx; 204 205 /* This function is called only by parallels_co_writev(), which will never 206 * pass a sector_num at or beyond the end of the image (because the block 207 * layer never passes such a sector_num to that function). Therefore, idx 208 * is always below s->bat_size. 209 * block_status() will limit *pnum so that sector_num + *pnum will not 210 * exceed the image end. Therefore, idx + to_allocate cannot exceed 211 * s->bat_size. 212 * Note that s->bat_size is an unsigned int, therefore idx + to_allocate 213 * will always fit into a uint32_t. */ 214 assert(idx < s->bat_size && idx + to_allocate <= s->bat_size); 215 216 space = to_allocate * s->tracks; 217 len = bdrv_getlength(bs->file->bs); 218 if (len < 0) { 219 return len; 220 } 221 if (s->data_end + space > (len >> BDRV_SECTOR_BITS)) { 222 int ret; 223 space += s->prealloc_size; 224 if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) { 225 ret = bdrv_pwrite_zeroes(bs->file, 226 s->data_end << BDRV_SECTOR_BITS, 227 space << BDRV_SECTOR_BITS, 0); 228 } else { 229 ret = bdrv_truncate(bs->file, 230 (s->data_end + space) << BDRV_SECTOR_BITS, 231 PREALLOC_MODE_OFF, NULL); 232 } 233 if (ret < 0) { 234 return ret; 235 } 236 } 237 238 for (i = 0; i < to_allocate; i++) { 239 s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier); 240 s->data_end += s->tracks; 241 bitmap_set(s->bat_dirty_bmap, 242 bat_entry_off(idx + i) / s->bat_dirty_block, 1); 243 } 244 245 return bat2sect(s, idx) + sector_num % s->tracks; 246 } 247 248 249 static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs) 250 { 251 BDRVParallelsState *s = bs->opaque; 252 unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block); 253 unsigned long bit; 254 255 qemu_co_mutex_lock(&s->lock); 256 257 bit = find_first_bit(s->bat_dirty_bmap, size); 258 while (bit < size) { 259 uint32_t off = bit * s->bat_dirty_block; 260 uint32_t to_write = s->bat_dirty_block; 261 int ret; 262 263 if (off + to_write > s->header_size) { 264 to_write = s->header_size - off; 265 } 266 ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off, 267 to_write); 268 if (ret < 0) { 269 qemu_co_mutex_unlock(&s->lock); 270 return ret; 271 } 272 bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1); 273 } 274 bitmap_zero(s->bat_dirty_bmap, size); 275 276 qemu_co_mutex_unlock(&s->lock); 277 return 0; 278 } 279 280 281 static int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs, 282 int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) 283 { 284 BDRVParallelsState *s = bs->opaque; 285 int64_t offset; 286 287 qemu_co_mutex_lock(&s->lock); 288 offset = block_status(s, sector_num, nb_sectors, pnum); 289 qemu_co_mutex_unlock(&s->lock); 290 291 if (offset < 0) { 292 return 0; 293 } 294 295 *file = bs->file->bs; 296 return (offset << BDRV_SECTOR_BITS) | 297 BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 298 } 299 300 static coroutine_fn int parallels_co_writev(BlockDriverState *bs, 301 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) 302 { 303 BDRVParallelsState *s = bs->opaque; 304 uint64_t bytes_done = 0; 305 QEMUIOVector hd_qiov; 306 int ret = 0; 307 308 qemu_iovec_init(&hd_qiov, qiov->niov); 309 310 while (nb_sectors > 0) { 311 int64_t position; 312 int n, nbytes; 313 314 qemu_co_mutex_lock(&s->lock); 315 position = allocate_clusters(bs, sector_num, nb_sectors, &n); 316 qemu_co_mutex_unlock(&s->lock); 317 if (position < 0) { 318 ret = (int)position; 319 break; 320 } 321 322 nbytes = n << BDRV_SECTOR_BITS; 323 324 qemu_iovec_reset(&hd_qiov); 325 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 326 327 ret = bdrv_co_writev(bs->file, position, n, &hd_qiov); 328 if (ret < 0) { 329 break; 330 } 331 332 nb_sectors -= n; 333 sector_num += n; 334 bytes_done += nbytes; 335 } 336 337 qemu_iovec_destroy(&hd_qiov); 338 return ret; 339 } 340 341 static coroutine_fn int parallels_co_readv(BlockDriverState *bs, 342 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) 343 { 344 BDRVParallelsState *s = bs->opaque; 345 uint64_t bytes_done = 0; 346 QEMUIOVector hd_qiov; 347 int ret = 0; 348 349 qemu_iovec_init(&hd_qiov, qiov->niov); 350 351 while (nb_sectors > 0) { 352 int64_t position; 353 int n, nbytes; 354 355 qemu_co_mutex_lock(&s->lock); 356 position = block_status(s, sector_num, nb_sectors, &n); 357 qemu_co_mutex_unlock(&s->lock); 358 359 nbytes = n << BDRV_SECTOR_BITS; 360 361 if (position < 0) { 362 qemu_iovec_memset(qiov, bytes_done, 0, nbytes); 363 } else { 364 qemu_iovec_reset(&hd_qiov); 365 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 366 367 ret = bdrv_co_readv(bs->file, position, n, &hd_qiov); 368 if (ret < 0) { 369 break; 370 } 371 } 372 373 nb_sectors -= n; 374 sector_num += n; 375 bytes_done += nbytes; 376 } 377 378 qemu_iovec_destroy(&hd_qiov); 379 return ret; 380 } 381 382 383 static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res, 384 BdrvCheckMode fix) 385 { 386 BDRVParallelsState *s = bs->opaque; 387 int64_t size, prev_off, high_off; 388 int ret; 389 uint32_t i; 390 bool flush_bat = false; 391 int cluster_size = s->tracks << BDRV_SECTOR_BITS; 392 393 size = bdrv_getlength(bs->file->bs); 394 if (size < 0) { 395 res->check_errors++; 396 return size; 397 } 398 399 if (s->header_unclean) { 400 fprintf(stderr, "%s image was not closed correctly\n", 401 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR"); 402 res->corruptions++; 403 if (fix & BDRV_FIX_ERRORS) { 404 /* parallels_close will do the job right */ 405 res->corruptions_fixed++; 406 s->header_unclean = false; 407 } 408 } 409 410 res->bfi.total_clusters = s->bat_size; 411 res->bfi.compressed_clusters = 0; /* compression is not supported */ 412 413 high_off = 0; 414 prev_off = 0; 415 for (i = 0; i < s->bat_size; i++) { 416 int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS; 417 if (off == 0) { 418 prev_off = 0; 419 continue; 420 } 421 422 /* cluster outside the image */ 423 if (off > size) { 424 fprintf(stderr, "%s cluster %u is outside image\n", 425 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); 426 res->corruptions++; 427 if (fix & BDRV_FIX_ERRORS) { 428 prev_off = 0; 429 s->bat_bitmap[i] = 0; 430 res->corruptions_fixed++; 431 flush_bat = true; 432 continue; 433 } 434 } 435 436 res->bfi.allocated_clusters++; 437 if (off > high_off) { 438 high_off = off; 439 } 440 441 if (prev_off != 0 && (prev_off + cluster_size) != off) { 442 res->bfi.fragmented_clusters++; 443 } 444 prev_off = off; 445 } 446 447 if (flush_bat) { 448 ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size); 449 if (ret < 0) { 450 res->check_errors++; 451 return ret; 452 } 453 } 454 455 res->image_end_offset = high_off + cluster_size; 456 if (size > res->image_end_offset) { 457 int64_t count; 458 count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size); 459 fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n", 460 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR", 461 size - res->image_end_offset); 462 res->leaks += count; 463 if (fix & BDRV_FIX_LEAKS) { 464 Error *local_err = NULL; 465 ret = bdrv_truncate(bs->file, res->image_end_offset, 466 PREALLOC_MODE_OFF, &local_err); 467 if (ret < 0) { 468 error_report_err(local_err); 469 res->check_errors++; 470 return ret; 471 } 472 res->leaks_fixed += count; 473 } 474 } 475 476 return 0; 477 } 478 479 480 static int parallels_create(const char *filename, QemuOpts *opts, Error **errp) 481 { 482 int64_t total_size, cl_size; 483 uint8_t tmp[BDRV_SECTOR_SIZE]; 484 Error *local_err = NULL; 485 BlockBackend *file; 486 uint32_t bat_entries, bat_sectors; 487 ParallelsHeader header; 488 int ret; 489 490 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 491 BDRV_SECTOR_SIZE); 492 cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE, 493 DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE); 494 if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) { 495 error_propagate(errp, local_err); 496 return -E2BIG; 497 } 498 499 ret = bdrv_create_file(filename, opts, &local_err); 500 if (ret < 0) { 501 error_propagate(errp, local_err); 502 return ret; 503 } 504 505 file = blk_new_open(filename, NULL, NULL, 506 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, 507 &local_err); 508 if (file == NULL) { 509 error_propagate(errp, local_err); 510 return -EIO; 511 } 512 513 blk_set_allow_write_beyond_eof(file, true); 514 515 ret = blk_truncate(file, 0, PREALLOC_MODE_OFF, errp); 516 if (ret < 0) { 517 goto exit; 518 } 519 520 bat_entries = DIV_ROUND_UP(total_size, cl_size); 521 bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size); 522 bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS; 523 524 memset(&header, 0, sizeof(header)); 525 memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic)); 526 header.version = cpu_to_le32(HEADER_VERSION); 527 /* don't care much about geometry, it is not used on image level */ 528 header.heads = cpu_to_le32(16); 529 header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE / 16 / 32); 530 header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS); 531 header.bat_entries = cpu_to_le32(bat_entries); 532 header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE)); 533 header.data_off = cpu_to_le32(bat_sectors); 534 535 /* write all the data */ 536 memset(tmp, 0, sizeof(tmp)); 537 memcpy(tmp, &header, sizeof(header)); 538 539 ret = blk_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE, 0); 540 if (ret < 0) { 541 goto exit; 542 } 543 ret = blk_pwrite_zeroes(file, BDRV_SECTOR_SIZE, 544 (bat_sectors - 1) << BDRV_SECTOR_BITS, 0); 545 if (ret < 0) { 546 goto exit; 547 } 548 ret = 0; 549 550 done: 551 blk_unref(file); 552 return ret; 553 554 exit: 555 error_setg_errno(errp, -ret, "Failed to create Parallels image"); 556 goto done; 557 } 558 559 560 static int parallels_probe(const uint8_t *buf, int buf_size, 561 const char *filename) 562 { 563 const ParallelsHeader *ph = (const void *)buf; 564 565 if (buf_size < sizeof(ParallelsHeader)) { 566 return 0; 567 } 568 569 if ((!memcmp(ph->magic, HEADER_MAGIC, 16) || 570 !memcmp(ph->magic, HEADER_MAGIC2, 16)) && 571 (le32_to_cpu(ph->version) == HEADER_VERSION)) { 572 return 100; 573 } 574 575 return 0; 576 } 577 578 static int parallels_update_header(BlockDriverState *bs) 579 { 580 BDRVParallelsState *s = bs->opaque; 581 unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs), 582 sizeof(ParallelsHeader)); 583 584 if (size > s->header_size) { 585 size = s->header_size; 586 } 587 return bdrv_pwrite_sync(bs->file, 0, s->header, size); 588 } 589 590 static int parallels_open(BlockDriverState *bs, QDict *options, int flags, 591 Error **errp) 592 { 593 BDRVParallelsState *s = bs->opaque; 594 ParallelsHeader ph; 595 int ret, size, i; 596 QemuOpts *opts = NULL; 597 Error *local_err = NULL; 598 char *buf; 599 600 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 601 false, errp); 602 if (!bs->file) { 603 return -EINVAL; 604 } 605 606 ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph)); 607 if (ret < 0) { 608 goto fail; 609 } 610 611 bs->total_sectors = le64_to_cpu(ph.nb_sectors); 612 613 if (le32_to_cpu(ph.version) != HEADER_VERSION) { 614 goto fail_format; 615 } 616 if (!memcmp(ph.magic, HEADER_MAGIC, 16)) { 617 s->off_multiplier = 1; 618 bs->total_sectors = 0xffffffff & bs->total_sectors; 619 } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) { 620 s->off_multiplier = le32_to_cpu(ph.tracks); 621 } else { 622 goto fail_format; 623 } 624 625 s->tracks = le32_to_cpu(ph.tracks); 626 if (s->tracks == 0) { 627 error_setg(errp, "Invalid image: Zero sectors per track"); 628 ret = -EINVAL; 629 goto fail; 630 } 631 if (s->tracks > INT32_MAX/513) { 632 error_setg(errp, "Invalid image: Too big cluster"); 633 ret = -EFBIG; 634 goto fail; 635 } 636 637 s->bat_size = le32_to_cpu(ph.bat_entries); 638 if (s->bat_size > INT_MAX / sizeof(uint32_t)) { 639 error_setg(errp, "Catalog too large"); 640 ret = -EFBIG; 641 goto fail; 642 } 643 644 size = bat_entry_off(s->bat_size); 645 s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs)); 646 s->header = qemu_try_blockalign(bs->file->bs, s->header_size); 647 if (s->header == NULL) { 648 ret = -ENOMEM; 649 goto fail; 650 } 651 s->data_end = le32_to_cpu(ph.data_off); 652 if (s->data_end == 0) { 653 s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE); 654 } 655 if (s->data_end < s->header_size) { 656 /* there is not enough unused space to fit to block align between BAT 657 and actual data. We can't avoid read-modify-write... */ 658 s->header_size = size; 659 } 660 661 ret = bdrv_pread(bs->file, 0, s->header, s->header_size); 662 if (ret < 0) { 663 goto fail; 664 } 665 s->bat_bitmap = (uint32_t *)(s->header + 1); 666 667 for (i = 0; i < s->bat_size; i++) { 668 int64_t off = bat2sect(s, i); 669 if (off >= s->data_end) { 670 s->data_end = off + s->tracks; 671 } 672 } 673 674 if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) { 675 /* Image was not closed correctly. The check is mandatory */ 676 s->header_unclean = true; 677 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { 678 error_setg(errp, "parallels: Image was not closed correctly; " 679 "cannot be opened read/write"); 680 ret = -EACCES; 681 goto fail; 682 } 683 } 684 685 opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, &local_err); 686 if (local_err != NULL) { 687 goto fail_options; 688 } 689 690 qemu_opts_absorb_qdict(opts, options, &local_err); 691 if (local_err != NULL) { 692 goto fail_options; 693 } 694 695 s->prealloc_size = 696 qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0); 697 s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS); 698 buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE); 699 s->prealloc_mode = qapi_enum_parse(prealloc_mode_lookup, buf, 700 PRL_PREALLOC_MODE__MAX, PRL_PREALLOC_MODE_FALLOCATE, &local_err); 701 g_free(buf); 702 if (local_err != NULL) { 703 goto fail_options; 704 } 705 706 if (!bdrv_has_zero_init(bs->file->bs)) { 707 s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE; 708 } 709 710 if (flags & BDRV_O_RDWR) { 711 s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC); 712 ret = parallels_update_header(bs); 713 if (ret < 0) { 714 goto fail; 715 } 716 } 717 718 s->bat_dirty_block = 4 * getpagesize(); 719 s->bat_dirty_bmap = 720 bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block)); 721 722 qemu_co_mutex_init(&s->lock); 723 return 0; 724 725 fail_format: 726 error_setg(errp, "Image not in Parallels format"); 727 ret = -EINVAL; 728 fail: 729 qemu_vfree(s->header); 730 return ret; 731 732 fail_options: 733 error_propagate(errp, local_err); 734 ret = -EINVAL; 735 goto fail; 736 } 737 738 739 static void parallels_close(BlockDriverState *bs) 740 { 741 BDRVParallelsState *s = bs->opaque; 742 743 if (bs->open_flags & BDRV_O_RDWR) { 744 s->header->inuse = 0; 745 parallels_update_header(bs); 746 } 747 748 if (bs->open_flags & BDRV_O_RDWR) { 749 bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS, 750 PREALLOC_MODE_OFF, NULL); 751 } 752 753 g_free(s->bat_dirty_bmap); 754 qemu_vfree(s->header); 755 } 756 757 static QemuOptsList parallels_create_opts = { 758 .name = "parallels-create-opts", 759 .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head), 760 .desc = { 761 { 762 .name = BLOCK_OPT_SIZE, 763 .type = QEMU_OPT_SIZE, 764 .help = "Virtual disk size", 765 }, 766 { 767 .name = BLOCK_OPT_CLUSTER_SIZE, 768 .type = QEMU_OPT_SIZE, 769 .help = "Parallels image cluster size", 770 .def_value_str = stringify(DEFAULT_CLUSTER_SIZE), 771 }, 772 { /* end of list */ } 773 } 774 }; 775 776 static BlockDriver bdrv_parallels = { 777 .format_name = "parallels", 778 .instance_size = sizeof(BDRVParallelsState), 779 .bdrv_probe = parallels_probe, 780 .bdrv_open = parallels_open, 781 .bdrv_close = parallels_close, 782 .bdrv_child_perm = bdrv_format_default_perms, 783 .bdrv_co_get_block_status = parallels_co_get_block_status, 784 .bdrv_has_zero_init = bdrv_has_zero_init_1, 785 .bdrv_co_flush_to_os = parallels_co_flush_to_os, 786 .bdrv_co_readv = parallels_co_readv, 787 .bdrv_co_writev = parallels_co_writev, 788 789 .bdrv_create = parallels_create, 790 .bdrv_check = parallels_check, 791 .create_opts = ¶llels_create_opts, 792 }; 793 794 static void bdrv_parallels_init(void) 795 { 796 bdrv_register(&bdrv_parallels); 797 } 798 799 block_init(bdrv_parallels_init); 800