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 39 /**************************************************************/ 40 41 #define HEADER_MAGIC "WithoutFreeSpace" 42 #define HEADER_MAGIC2 "WithouFreSpacExt" 43 #define HEADER_VERSION 2 44 #define HEADER_INUSE_MAGIC (0x746F6E59) 45 #define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32) 46 47 #define DEFAULT_CLUSTER_SIZE 1048576 /* 1 MiB */ 48 49 50 // always little-endian 51 typedef struct ParallelsHeader { 52 char magic[16]; // "WithoutFreeSpace" 53 uint32_t version; 54 uint32_t heads; 55 uint32_t cylinders; 56 uint32_t tracks; 57 uint32_t bat_entries; 58 uint64_t nb_sectors; 59 uint32_t inuse; 60 uint32_t data_off; 61 char padding[12]; 62 } QEMU_PACKED ParallelsHeader; 63 64 65 typedef enum ParallelsPreallocMode { 66 PRL_PREALLOC_MODE_FALLOCATE = 0, 67 PRL_PREALLOC_MODE_TRUNCATE = 1, 68 PRL_PREALLOC_MODE__MAX = 2, 69 } ParallelsPreallocMode; 70 71 static const char *prealloc_mode_lookup[] = { 72 "falloc", 73 "truncate", 74 NULL, 75 }; 76 77 78 typedef struct BDRVParallelsState { 79 /** Locking is conservative, the lock protects 80 * - image file extending (truncate, fallocate) 81 * - any access to block allocation table 82 */ 83 CoMutex lock; 84 85 ParallelsHeader *header; 86 uint32_t header_size; 87 bool header_unclean; 88 89 unsigned long *bat_dirty_bmap; 90 unsigned int bat_dirty_block; 91 92 uint32_t *bat_bitmap; 93 unsigned int bat_size; 94 95 int64_t data_end; 96 uint64_t prealloc_size; 97 ParallelsPreallocMode prealloc_mode; 98 99 unsigned int tracks; 100 101 unsigned int off_multiplier; 102 } BDRVParallelsState; 103 104 105 #define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode" 106 #define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size" 107 108 static QemuOptsList parallels_runtime_opts = { 109 .name = "parallels", 110 .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head), 111 .desc = { 112 { 113 .name = PARALLELS_OPT_PREALLOC_SIZE, 114 .type = QEMU_OPT_SIZE, 115 .help = "Preallocation size on image expansion", 116 .def_value_str = "128M", 117 }, 118 { 119 .name = PARALLELS_OPT_PREALLOC_MODE, 120 .type = QEMU_OPT_STRING, 121 .help = "Preallocation mode on image expansion " 122 "(allowed values: falloc, truncate)", 123 .def_value_str = "falloc", 124 }, 125 { /* end of list */ }, 126 }, 127 }; 128 129 130 static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx) 131 { 132 return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier; 133 } 134 135 static uint32_t bat_entry_off(uint32_t idx) 136 { 137 return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx; 138 } 139 140 static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num) 141 { 142 uint32_t index, offset; 143 144 index = sector_num / s->tracks; 145 offset = sector_num % s->tracks; 146 147 /* not allocated */ 148 if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) { 149 return -1; 150 } 151 return bat2sect(s, index) + offset; 152 } 153 154 static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num, 155 int nb_sectors) 156 { 157 int ret = s->tracks - sector_num % s->tracks; 158 return MIN(nb_sectors, ret); 159 } 160 161 static int64_t block_status(BDRVParallelsState *s, int64_t sector_num, 162 int nb_sectors, int *pnum) 163 { 164 int64_t start_off = -2, prev_end_off = -2; 165 166 *pnum = 0; 167 while (nb_sectors > 0 || start_off == -2) { 168 int64_t offset = seek_to_sector(s, sector_num); 169 int to_end; 170 171 if (start_off == -2) { 172 start_off = offset; 173 prev_end_off = offset; 174 } else if (offset != prev_end_off) { 175 break; 176 } 177 178 to_end = cluster_remainder(s, sector_num, nb_sectors); 179 nb_sectors -= to_end; 180 sector_num += to_end; 181 *pnum += to_end; 182 183 if (offset > 0) { 184 prev_end_off += to_end; 185 } 186 } 187 return start_off; 188 } 189 190 static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num, 191 int nb_sectors, int *pnum) 192 { 193 BDRVParallelsState *s = bs->opaque; 194 int64_t pos, space, idx, to_allocate, i, len; 195 196 pos = block_status(s, sector_num, nb_sectors, pnum); 197 if (pos > 0) { 198 return pos; 199 } 200 201 idx = sector_num / s->tracks; 202 to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx; 203 204 /* This function is called only by parallels_co_writev(), which will never 205 * pass a sector_num at or beyond the end of the image (because the block 206 * layer never passes such a sector_num to that function). Therefore, idx 207 * is always below s->bat_size. 208 * block_status() will limit *pnum so that sector_num + *pnum will not 209 * exceed the image end. Therefore, idx + to_allocate cannot exceed 210 * s->bat_size. 211 * Note that s->bat_size is an unsigned int, therefore idx + to_allocate 212 * will always fit into a uint32_t. */ 213 assert(idx < s->bat_size && idx + to_allocate <= s->bat_size); 214 215 space = to_allocate * s->tracks; 216 len = bdrv_getlength(bs->file->bs); 217 if (len < 0) { 218 return len; 219 } 220 if (s->data_end + space > (len >> BDRV_SECTOR_BITS)) { 221 int ret; 222 space += s->prealloc_size; 223 if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) { 224 ret = bdrv_pwrite_zeroes(bs->file, 225 s->data_end << BDRV_SECTOR_BITS, 226 space << BDRV_SECTOR_BITS, 0); 227 } else { 228 ret = bdrv_truncate(bs->file, 229 (s->data_end + space) << BDRV_SECTOR_BITS, 230 PREALLOC_MODE_OFF, NULL); 231 } 232 if (ret < 0) { 233 return ret; 234 } 235 } 236 237 for (i = 0; i < to_allocate; i++) { 238 s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier); 239 s->data_end += s->tracks; 240 bitmap_set(s->bat_dirty_bmap, 241 bat_entry_off(idx + i) / s->bat_dirty_block, 1); 242 } 243 244 return bat2sect(s, idx) + sector_num % s->tracks; 245 } 246 247 248 static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs) 249 { 250 BDRVParallelsState *s = bs->opaque; 251 unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block); 252 unsigned long bit; 253 254 qemu_co_mutex_lock(&s->lock); 255 256 bit = find_first_bit(s->bat_dirty_bmap, size); 257 while (bit < size) { 258 uint32_t off = bit * s->bat_dirty_block; 259 uint32_t to_write = s->bat_dirty_block; 260 int ret; 261 262 if (off + to_write > s->header_size) { 263 to_write = s->header_size - off; 264 } 265 ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off, 266 to_write); 267 if (ret < 0) { 268 qemu_co_mutex_unlock(&s->lock); 269 return ret; 270 } 271 bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1); 272 } 273 bitmap_zero(s->bat_dirty_bmap, size); 274 275 qemu_co_mutex_unlock(&s->lock); 276 return 0; 277 } 278 279 280 static int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs, 281 int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) 282 { 283 BDRVParallelsState *s = bs->opaque; 284 int64_t offset; 285 286 qemu_co_mutex_lock(&s->lock); 287 offset = block_status(s, sector_num, nb_sectors, pnum); 288 qemu_co_mutex_unlock(&s->lock); 289 290 if (offset < 0) { 291 return 0; 292 } 293 294 *file = bs->file->bs; 295 return (offset << BDRV_SECTOR_BITS) | 296 BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 297 } 298 299 static coroutine_fn int parallels_co_writev(BlockDriverState *bs, 300 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) 301 { 302 BDRVParallelsState *s = bs->opaque; 303 uint64_t bytes_done = 0; 304 QEMUIOVector hd_qiov; 305 int ret = 0; 306 307 qemu_iovec_init(&hd_qiov, qiov->niov); 308 309 while (nb_sectors > 0) { 310 int64_t position; 311 int n, nbytes; 312 313 qemu_co_mutex_lock(&s->lock); 314 position = allocate_clusters(bs, sector_num, nb_sectors, &n); 315 qemu_co_mutex_unlock(&s->lock); 316 if (position < 0) { 317 ret = (int)position; 318 break; 319 } 320 321 nbytes = n << BDRV_SECTOR_BITS; 322 323 qemu_iovec_reset(&hd_qiov); 324 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 325 326 ret = bdrv_co_writev(bs->file, position, n, &hd_qiov); 327 if (ret < 0) { 328 break; 329 } 330 331 nb_sectors -= n; 332 sector_num += n; 333 bytes_done += nbytes; 334 } 335 336 qemu_iovec_destroy(&hd_qiov); 337 return ret; 338 } 339 340 static coroutine_fn int parallels_co_readv(BlockDriverState *bs, 341 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) 342 { 343 BDRVParallelsState *s = bs->opaque; 344 uint64_t bytes_done = 0; 345 QEMUIOVector hd_qiov; 346 int ret = 0; 347 348 qemu_iovec_init(&hd_qiov, qiov->niov); 349 350 while (nb_sectors > 0) { 351 int64_t position; 352 int n, nbytes; 353 354 qemu_co_mutex_lock(&s->lock); 355 position = block_status(s, sector_num, nb_sectors, &n); 356 qemu_co_mutex_unlock(&s->lock); 357 358 nbytes = n << BDRV_SECTOR_BITS; 359 360 if (position < 0) { 361 qemu_iovec_memset(qiov, bytes_done, 0, nbytes); 362 } else { 363 qemu_iovec_reset(&hd_qiov); 364 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 365 366 ret = bdrv_co_readv(bs->file, position, n, &hd_qiov); 367 if (ret < 0) { 368 break; 369 } 370 } 371 372 nb_sectors -= n; 373 sector_num += n; 374 bytes_done += nbytes; 375 } 376 377 qemu_iovec_destroy(&hd_qiov); 378 return ret; 379 } 380 381 382 static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res, 383 BdrvCheckMode fix) 384 { 385 BDRVParallelsState *s = bs->opaque; 386 int64_t size, prev_off, high_off; 387 int ret; 388 uint32_t i; 389 bool flush_bat = false; 390 int cluster_size = s->tracks << BDRV_SECTOR_BITS; 391 392 size = bdrv_getlength(bs->file->bs); 393 if (size < 0) { 394 res->check_errors++; 395 return size; 396 } 397 398 if (s->header_unclean) { 399 fprintf(stderr, "%s image was not closed correctly\n", 400 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR"); 401 res->corruptions++; 402 if (fix & BDRV_FIX_ERRORS) { 403 /* parallels_close will do the job right */ 404 res->corruptions_fixed++; 405 s->header_unclean = false; 406 } 407 } 408 409 res->bfi.total_clusters = s->bat_size; 410 res->bfi.compressed_clusters = 0; /* compression is not supported */ 411 412 high_off = 0; 413 prev_off = 0; 414 for (i = 0; i < s->bat_size; i++) { 415 int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS; 416 if (off == 0) { 417 prev_off = 0; 418 continue; 419 } 420 421 /* cluster outside the image */ 422 if (off > size) { 423 fprintf(stderr, "%s cluster %u is outside image\n", 424 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); 425 res->corruptions++; 426 if (fix & BDRV_FIX_ERRORS) { 427 prev_off = 0; 428 s->bat_bitmap[i] = 0; 429 res->corruptions_fixed++; 430 flush_bat = true; 431 continue; 432 } 433 } 434 435 res->bfi.allocated_clusters++; 436 if (off > high_off) { 437 high_off = off; 438 } 439 440 if (prev_off != 0 && (prev_off + cluster_size) != off) { 441 res->bfi.fragmented_clusters++; 442 } 443 prev_off = off; 444 } 445 446 if (flush_bat) { 447 ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size); 448 if (ret < 0) { 449 res->check_errors++; 450 return ret; 451 } 452 } 453 454 res->image_end_offset = high_off + cluster_size; 455 if (size > res->image_end_offset) { 456 int64_t count; 457 count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size); 458 fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n", 459 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR", 460 size - res->image_end_offset); 461 res->leaks += count; 462 if (fix & BDRV_FIX_LEAKS) { 463 Error *local_err = NULL; 464 ret = bdrv_truncate(bs->file, res->image_end_offset, 465 PREALLOC_MODE_OFF, &local_err); 466 if (ret < 0) { 467 error_report_err(local_err); 468 res->check_errors++; 469 return ret; 470 } 471 res->leaks_fixed += count; 472 } 473 } 474 475 return 0; 476 } 477 478 479 static int parallels_create(const char *filename, QemuOpts *opts, Error **errp) 480 { 481 int64_t total_size, cl_size; 482 uint8_t tmp[BDRV_SECTOR_SIZE]; 483 Error *local_err = NULL; 484 BlockBackend *file; 485 uint32_t bat_entries, bat_sectors; 486 ParallelsHeader header; 487 int ret; 488 489 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 490 BDRV_SECTOR_SIZE); 491 cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE, 492 DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE); 493 if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) { 494 error_propagate(errp, local_err); 495 return -E2BIG; 496 } 497 498 ret = bdrv_create_file(filename, opts, &local_err); 499 if (ret < 0) { 500 error_propagate(errp, local_err); 501 return ret; 502 } 503 504 file = blk_new_open(filename, NULL, NULL, 505 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, 506 &local_err); 507 if (file == NULL) { 508 error_propagate(errp, local_err); 509 return -EIO; 510 } 511 512 blk_set_allow_write_beyond_eof(file, true); 513 514 ret = blk_truncate(file, 0, PREALLOC_MODE_OFF, errp); 515 if (ret < 0) { 516 goto exit; 517 } 518 519 bat_entries = DIV_ROUND_UP(total_size, cl_size); 520 bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size); 521 bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS; 522 523 memset(&header, 0, sizeof(header)); 524 memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic)); 525 header.version = cpu_to_le32(HEADER_VERSION); 526 /* don't care much about geometry, it is not used on image level */ 527 header.heads = cpu_to_le32(16); 528 header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE / 16 / 32); 529 header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS); 530 header.bat_entries = cpu_to_le32(bat_entries); 531 header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE)); 532 header.data_off = cpu_to_le32(bat_sectors); 533 534 /* write all the data */ 535 memset(tmp, 0, sizeof(tmp)); 536 memcpy(tmp, &header, sizeof(header)); 537 538 ret = blk_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE, 0); 539 if (ret < 0) { 540 goto exit; 541 } 542 ret = blk_pwrite_zeroes(file, BDRV_SECTOR_SIZE, 543 (bat_sectors - 1) << BDRV_SECTOR_BITS, 0); 544 if (ret < 0) { 545 goto exit; 546 } 547 ret = 0; 548 549 done: 550 blk_unref(file); 551 return ret; 552 553 exit: 554 error_setg_errno(errp, -ret, "Failed to create Parallels image"); 555 goto done; 556 } 557 558 559 static int parallels_probe(const uint8_t *buf, int buf_size, 560 const char *filename) 561 { 562 const ParallelsHeader *ph = (const void *)buf; 563 564 if (buf_size < sizeof(ParallelsHeader)) { 565 return 0; 566 } 567 568 if ((!memcmp(ph->magic, HEADER_MAGIC, 16) || 569 !memcmp(ph->magic, HEADER_MAGIC2, 16)) && 570 (le32_to_cpu(ph->version) == HEADER_VERSION)) { 571 return 100; 572 } 573 574 return 0; 575 } 576 577 static int parallels_update_header(BlockDriverState *bs) 578 { 579 BDRVParallelsState *s = bs->opaque; 580 unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs), 581 sizeof(ParallelsHeader)); 582 583 if (size > s->header_size) { 584 size = s->header_size; 585 } 586 return bdrv_pwrite_sync(bs->file, 0, s->header, size); 587 } 588 589 static int parallels_open(BlockDriverState *bs, QDict *options, int flags, 590 Error **errp) 591 { 592 BDRVParallelsState *s = bs->opaque; 593 ParallelsHeader ph; 594 int ret, size, i; 595 QemuOpts *opts = NULL; 596 Error *local_err = NULL; 597 char *buf; 598 599 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 600 false, errp); 601 if (!bs->file) { 602 return -EINVAL; 603 } 604 605 ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph)); 606 if (ret < 0) { 607 goto fail; 608 } 609 610 bs->total_sectors = le64_to_cpu(ph.nb_sectors); 611 612 if (le32_to_cpu(ph.version) != HEADER_VERSION) { 613 goto fail_format; 614 } 615 if (!memcmp(ph.magic, HEADER_MAGIC, 16)) { 616 s->off_multiplier = 1; 617 bs->total_sectors = 0xffffffff & bs->total_sectors; 618 } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) { 619 s->off_multiplier = le32_to_cpu(ph.tracks); 620 } else { 621 goto fail_format; 622 } 623 624 s->tracks = le32_to_cpu(ph.tracks); 625 if (s->tracks == 0) { 626 error_setg(errp, "Invalid image: Zero sectors per track"); 627 ret = -EINVAL; 628 goto fail; 629 } 630 if (s->tracks > INT32_MAX/513) { 631 error_setg(errp, "Invalid image: Too big cluster"); 632 ret = -EFBIG; 633 goto fail; 634 } 635 636 s->bat_size = le32_to_cpu(ph.bat_entries); 637 if (s->bat_size > INT_MAX / sizeof(uint32_t)) { 638 error_setg(errp, "Catalog too large"); 639 ret = -EFBIG; 640 goto fail; 641 } 642 643 size = bat_entry_off(s->bat_size); 644 s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs)); 645 s->header = qemu_try_blockalign(bs->file->bs, s->header_size); 646 if (s->header == NULL) { 647 ret = -ENOMEM; 648 goto fail; 649 } 650 s->data_end = le32_to_cpu(ph.data_off); 651 if (s->data_end == 0) { 652 s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE); 653 } 654 if (s->data_end < s->header_size) { 655 /* there is not enough unused space to fit to block align between BAT 656 and actual data. We can't avoid read-modify-write... */ 657 s->header_size = size; 658 } 659 660 ret = bdrv_pread(bs->file, 0, s->header, s->header_size); 661 if (ret < 0) { 662 goto fail; 663 } 664 s->bat_bitmap = (uint32_t *)(s->header + 1); 665 666 for (i = 0; i < s->bat_size; i++) { 667 int64_t off = bat2sect(s, i); 668 if (off >= s->data_end) { 669 s->data_end = off + s->tracks; 670 } 671 } 672 673 if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) { 674 /* Image was not closed correctly. The check is mandatory */ 675 s->header_unclean = true; 676 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { 677 error_setg(errp, "parallels: Image was not closed correctly; " 678 "cannot be opened read/write"); 679 ret = -EACCES; 680 goto fail; 681 } 682 } 683 684 opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, &local_err); 685 if (local_err != NULL) { 686 goto fail_options; 687 } 688 689 qemu_opts_absorb_qdict(opts, options, &local_err); 690 if (local_err != NULL) { 691 goto fail_options; 692 } 693 694 s->prealloc_size = 695 qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0); 696 s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS); 697 buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE); 698 s->prealloc_mode = qapi_enum_parse(prealloc_mode_lookup, buf, 699 PRL_PREALLOC_MODE_FALLOCATE, 700 &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