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