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 "migration/blocker.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 QEnumLookup prealloc_mode_lookup = { 73 .array = (const char *const[]) { 74 "falloc", 75 "truncate", 76 }, 77 .size = PRL_PREALLOC_MODE__MAX 78 }; 79 80 typedef struct BDRVParallelsState { 81 /** Locking is conservative, the lock protects 82 * - image file extending (truncate, fallocate) 83 * - any access to block allocation table 84 */ 85 CoMutex lock; 86 87 ParallelsHeader *header; 88 uint32_t header_size; 89 bool header_unclean; 90 91 unsigned long *bat_dirty_bmap; 92 unsigned int bat_dirty_block; 93 94 uint32_t *bat_bitmap; 95 unsigned int bat_size; 96 97 int64_t data_end; 98 uint64_t prealloc_size; 99 ParallelsPreallocMode prealloc_mode; 100 101 unsigned int tracks; 102 103 unsigned int off_multiplier; 104 Error *migration_blocker; 105 } BDRVParallelsState; 106 107 108 #define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode" 109 #define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size" 110 111 static QemuOptsList parallels_runtime_opts = { 112 .name = "parallels", 113 .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head), 114 .desc = { 115 { 116 .name = PARALLELS_OPT_PREALLOC_SIZE, 117 .type = QEMU_OPT_SIZE, 118 .help = "Preallocation size on image expansion", 119 .def_value_str = "128M", 120 }, 121 { 122 .name = PARALLELS_OPT_PREALLOC_MODE, 123 .type = QEMU_OPT_STRING, 124 .help = "Preallocation mode on image expansion " 125 "(allowed values: falloc, truncate)", 126 .def_value_str = "falloc", 127 }, 128 { /* end of list */ }, 129 }, 130 }; 131 132 133 static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx) 134 { 135 return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier; 136 } 137 138 static uint32_t bat_entry_off(uint32_t idx) 139 { 140 return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx; 141 } 142 143 static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num) 144 { 145 uint32_t index, offset; 146 147 index = sector_num / s->tracks; 148 offset = sector_num % s->tracks; 149 150 /* not allocated */ 151 if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) { 152 return -1; 153 } 154 return bat2sect(s, index) + offset; 155 } 156 157 static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num, 158 int nb_sectors) 159 { 160 int ret = s->tracks - sector_num % s->tracks; 161 return MIN(nb_sectors, ret); 162 } 163 164 static int64_t block_status(BDRVParallelsState *s, int64_t sector_num, 165 int nb_sectors, int *pnum) 166 { 167 int64_t start_off = -2, prev_end_off = -2; 168 169 *pnum = 0; 170 while (nb_sectors > 0 || start_off == -2) { 171 int64_t offset = seek_to_sector(s, sector_num); 172 int to_end; 173 174 if (start_off == -2) { 175 start_off = offset; 176 prev_end_off = offset; 177 } else if (offset != prev_end_off) { 178 break; 179 } 180 181 to_end = cluster_remainder(s, sector_num, nb_sectors); 182 nb_sectors -= to_end; 183 sector_num += to_end; 184 *pnum += to_end; 185 186 if (offset > 0) { 187 prev_end_off += to_end; 188 } 189 } 190 return start_off; 191 } 192 193 static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num, 194 int nb_sectors, int *pnum) 195 { 196 BDRVParallelsState *s = bs->opaque; 197 int64_t pos, space, idx, to_allocate, i, len; 198 199 pos = block_status(s, sector_num, nb_sectors, pnum); 200 if (pos > 0) { 201 return pos; 202 } 203 204 idx = sector_num / s->tracks; 205 to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx; 206 207 /* This function is called only by parallels_co_writev(), which will never 208 * pass a sector_num at or beyond the end of the image (because the block 209 * layer never passes such a sector_num to that function). Therefore, idx 210 * is always below s->bat_size. 211 * block_status() will limit *pnum so that sector_num + *pnum will not 212 * exceed the image end. Therefore, idx + to_allocate cannot exceed 213 * s->bat_size. 214 * Note that s->bat_size is an unsigned int, therefore idx + to_allocate 215 * will always fit into a uint32_t. */ 216 assert(idx < s->bat_size && idx + to_allocate <= s->bat_size); 217 218 space = to_allocate * s->tracks; 219 len = bdrv_getlength(bs->file->bs); 220 if (len < 0) { 221 return len; 222 } 223 if (s->data_end + space > (len >> BDRV_SECTOR_BITS)) { 224 int ret; 225 space += s->prealloc_size; 226 if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) { 227 ret = bdrv_pwrite_zeroes(bs->file, 228 s->data_end << BDRV_SECTOR_BITS, 229 space << BDRV_SECTOR_BITS, 0); 230 } else { 231 ret = bdrv_truncate(bs->file, 232 (s->data_end + space) << BDRV_SECTOR_BITS, 233 PREALLOC_MODE_OFF, NULL); 234 } 235 if (ret < 0) { 236 return ret; 237 } 238 } 239 240 for (i = 0; i < to_allocate; i++) { 241 s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier); 242 s->data_end += s->tracks; 243 bitmap_set(s->bat_dirty_bmap, 244 bat_entry_off(idx + i) / s->bat_dirty_block, 1); 245 } 246 247 return bat2sect(s, idx) + sector_num % s->tracks; 248 } 249 250 251 static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs) 252 { 253 BDRVParallelsState *s = bs->opaque; 254 unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block); 255 unsigned long bit; 256 257 qemu_co_mutex_lock(&s->lock); 258 259 bit = find_first_bit(s->bat_dirty_bmap, size); 260 while (bit < size) { 261 uint32_t off = bit * s->bat_dirty_block; 262 uint32_t to_write = s->bat_dirty_block; 263 int ret; 264 265 if (off + to_write > s->header_size) { 266 to_write = s->header_size - off; 267 } 268 ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off, 269 to_write); 270 if (ret < 0) { 271 qemu_co_mutex_unlock(&s->lock); 272 return ret; 273 } 274 bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1); 275 } 276 bitmap_zero(s->bat_dirty_bmap, size); 277 278 qemu_co_mutex_unlock(&s->lock); 279 return 0; 280 } 281 282 283 static int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs, 284 int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) 285 { 286 BDRVParallelsState *s = bs->opaque; 287 int64_t offset; 288 289 qemu_co_mutex_lock(&s->lock); 290 offset = block_status(s, sector_num, nb_sectors, pnum); 291 qemu_co_mutex_unlock(&s->lock); 292 293 if (offset < 0) { 294 return 0; 295 } 296 297 *file = bs->file->bs; 298 return (offset << BDRV_SECTOR_BITS) | 299 BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 300 } 301 302 static coroutine_fn int parallels_co_writev(BlockDriverState *bs, 303 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) 304 { 305 BDRVParallelsState *s = bs->opaque; 306 uint64_t bytes_done = 0; 307 QEMUIOVector hd_qiov; 308 int ret = 0; 309 310 qemu_iovec_init(&hd_qiov, qiov->niov); 311 312 while (nb_sectors > 0) { 313 int64_t position; 314 int n, nbytes; 315 316 qemu_co_mutex_lock(&s->lock); 317 position = allocate_clusters(bs, sector_num, nb_sectors, &n); 318 qemu_co_mutex_unlock(&s->lock); 319 if (position < 0) { 320 ret = (int)position; 321 break; 322 } 323 324 nbytes = n << BDRV_SECTOR_BITS; 325 326 qemu_iovec_reset(&hd_qiov); 327 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 328 329 ret = bdrv_co_writev(bs->file, position, n, &hd_qiov); 330 if (ret < 0) { 331 break; 332 } 333 334 nb_sectors -= n; 335 sector_num += n; 336 bytes_done += nbytes; 337 } 338 339 qemu_iovec_destroy(&hd_qiov); 340 return ret; 341 } 342 343 static coroutine_fn int parallels_co_readv(BlockDriverState *bs, 344 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) 345 { 346 BDRVParallelsState *s = bs->opaque; 347 uint64_t bytes_done = 0; 348 QEMUIOVector hd_qiov; 349 int ret = 0; 350 351 qemu_iovec_init(&hd_qiov, qiov->niov); 352 353 while (nb_sectors > 0) { 354 int64_t position; 355 int n, nbytes; 356 357 qemu_co_mutex_lock(&s->lock); 358 position = block_status(s, sector_num, nb_sectors, &n); 359 qemu_co_mutex_unlock(&s->lock); 360 361 nbytes = n << BDRV_SECTOR_BITS; 362 363 if (position < 0) { 364 qemu_iovec_memset(qiov, bytes_done, 0, nbytes); 365 } else { 366 qemu_iovec_reset(&hd_qiov); 367 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 368 369 ret = bdrv_co_readv(bs->file, position, n, &hd_qiov); 370 if (ret < 0) { 371 break; 372 } 373 } 374 375 nb_sectors -= n; 376 sector_num += n; 377 bytes_done += nbytes; 378 } 379 380 qemu_iovec_destroy(&hd_qiov); 381 return ret; 382 } 383 384 385 static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res, 386 BdrvCheckMode fix) 387 { 388 BDRVParallelsState *s = bs->opaque; 389 int64_t size, prev_off, high_off; 390 int ret; 391 uint32_t i; 392 bool flush_bat = false; 393 int cluster_size = s->tracks << BDRV_SECTOR_BITS; 394 395 size = bdrv_getlength(bs->file->bs); 396 if (size < 0) { 397 res->check_errors++; 398 return size; 399 } 400 401 if (s->header_unclean) { 402 fprintf(stderr, "%s image was not closed correctly\n", 403 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR"); 404 res->corruptions++; 405 if (fix & BDRV_FIX_ERRORS) { 406 /* parallels_close will do the job right */ 407 res->corruptions_fixed++; 408 s->header_unclean = false; 409 } 410 } 411 412 res->bfi.total_clusters = s->bat_size; 413 res->bfi.compressed_clusters = 0; /* compression is not supported */ 414 415 high_off = 0; 416 prev_off = 0; 417 for (i = 0; i < s->bat_size; i++) { 418 int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS; 419 if (off == 0) { 420 prev_off = 0; 421 continue; 422 } 423 424 /* cluster outside the image */ 425 if (off > size) { 426 fprintf(stderr, "%s cluster %u is outside image\n", 427 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); 428 res->corruptions++; 429 if (fix & BDRV_FIX_ERRORS) { 430 prev_off = 0; 431 s->bat_bitmap[i] = 0; 432 res->corruptions_fixed++; 433 flush_bat = true; 434 continue; 435 } 436 } 437 438 res->bfi.allocated_clusters++; 439 if (off > high_off) { 440 high_off = off; 441 } 442 443 if (prev_off != 0 && (prev_off + cluster_size) != off) { 444 res->bfi.fragmented_clusters++; 445 } 446 prev_off = off; 447 } 448 449 if (flush_bat) { 450 ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size); 451 if (ret < 0) { 452 res->check_errors++; 453 return ret; 454 } 455 } 456 457 res->image_end_offset = high_off + cluster_size; 458 if (size > res->image_end_offset) { 459 int64_t count; 460 count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size); 461 fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n", 462 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR", 463 size - res->image_end_offset); 464 res->leaks += count; 465 if (fix & BDRV_FIX_LEAKS) { 466 Error *local_err = NULL; 467 ret = bdrv_truncate(bs->file, res->image_end_offset, 468 PREALLOC_MODE_OFF, &local_err); 469 if (ret < 0) { 470 error_report_err(local_err); 471 res->check_errors++; 472 return ret; 473 } 474 res->leaks_fixed += count; 475 } 476 } 477 478 return 0; 479 } 480 481 482 static int parallels_create(const char *filename, QemuOpts *opts, Error **errp) 483 { 484 int64_t total_size, cl_size; 485 uint8_t tmp[BDRV_SECTOR_SIZE]; 486 Error *local_err = NULL; 487 BlockBackend *file; 488 uint32_t bat_entries, bat_sectors; 489 ParallelsHeader header; 490 int ret; 491 492 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 493 BDRV_SECTOR_SIZE); 494 cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE, 495 DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE); 496 if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) { 497 error_propagate(errp, local_err); 498 return -E2BIG; 499 } 500 501 ret = bdrv_create_file(filename, opts, &local_err); 502 if (ret < 0) { 503 error_propagate(errp, local_err); 504 return ret; 505 } 506 507 file = blk_new_open(filename, NULL, NULL, 508 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, 509 &local_err); 510 if (file == NULL) { 511 error_propagate(errp, local_err); 512 return -EIO; 513 } 514 515 blk_set_allow_write_beyond_eof(file, true); 516 517 ret = blk_truncate(file, 0, PREALLOC_MODE_OFF, errp); 518 if (ret < 0) { 519 goto exit; 520 } 521 522 bat_entries = DIV_ROUND_UP(total_size, cl_size); 523 bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size); 524 bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS; 525 526 memset(&header, 0, sizeof(header)); 527 memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic)); 528 header.version = cpu_to_le32(HEADER_VERSION); 529 /* don't care much about geometry, it is not used on image level */ 530 header.heads = cpu_to_le32(16); 531 header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE / 16 / 32); 532 header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS); 533 header.bat_entries = cpu_to_le32(bat_entries); 534 header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE)); 535 header.data_off = cpu_to_le32(bat_sectors); 536 537 /* write all the data */ 538 memset(tmp, 0, sizeof(tmp)); 539 memcpy(tmp, &header, sizeof(header)); 540 541 ret = blk_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE, 0); 542 if (ret < 0) { 543 goto exit; 544 } 545 ret = blk_pwrite_zeroes(file, BDRV_SECTOR_SIZE, 546 (bat_sectors - 1) << BDRV_SECTOR_BITS, 0); 547 if (ret < 0) { 548 goto exit; 549 } 550 ret = 0; 551 552 done: 553 blk_unref(file); 554 return ret; 555 556 exit: 557 error_setg_errno(errp, -ret, "Failed to create Parallels image"); 558 goto done; 559 } 560 561 562 static int parallels_probe(const uint8_t *buf, int buf_size, 563 const char *filename) 564 { 565 const ParallelsHeader *ph = (const void *)buf; 566 567 if (buf_size < sizeof(ParallelsHeader)) { 568 return 0; 569 } 570 571 if ((!memcmp(ph->magic, HEADER_MAGIC, 16) || 572 !memcmp(ph->magic, HEADER_MAGIC2, 16)) && 573 (le32_to_cpu(ph->version) == HEADER_VERSION)) { 574 return 100; 575 } 576 577 return 0; 578 } 579 580 static int parallels_update_header(BlockDriverState *bs) 581 { 582 BDRVParallelsState *s = bs->opaque; 583 unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs), 584 sizeof(ParallelsHeader)); 585 586 if (size > s->header_size) { 587 size = s->header_size; 588 } 589 return bdrv_pwrite_sync(bs->file, 0, s->header, size); 590 } 591 592 static int parallels_open(BlockDriverState *bs, QDict *options, int flags, 593 Error **errp) 594 { 595 BDRVParallelsState *s = bs->opaque; 596 ParallelsHeader ph; 597 int ret, size, i; 598 QemuOpts *opts = NULL; 599 Error *local_err = NULL; 600 char *buf; 601 602 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 603 false, errp); 604 if (!bs->file) { 605 return -EINVAL; 606 } 607 608 ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph)); 609 if (ret < 0) { 610 goto fail; 611 } 612 613 bs->total_sectors = le64_to_cpu(ph.nb_sectors); 614 615 if (le32_to_cpu(ph.version) != HEADER_VERSION) { 616 goto fail_format; 617 } 618 if (!memcmp(ph.magic, HEADER_MAGIC, 16)) { 619 s->off_multiplier = 1; 620 bs->total_sectors = 0xffffffff & bs->total_sectors; 621 } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) { 622 s->off_multiplier = le32_to_cpu(ph.tracks); 623 } else { 624 goto fail_format; 625 } 626 627 s->tracks = le32_to_cpu(ph.tracks); 628 if (s->tracks == 0) { 629 error_setg(errp, "Invalid image: Zero sectors per track"); 630 ret = -EINVAL; 631 goto fail; 632 } 633 if (s->tracks > INT32_MAX/513) { 634 error_setg(errp, "Invalid image: Too big cluster"); 635 ret = -EFBIG; 636 goto fail; 637 } 638 639 s->bat_size = le32_to_cpu(ph.bat_entries); 640 if (s->bat_size > INT_MAX / sizeof(uint32_t)) { 641 error_setg(errp, "Catalog too large"); 642 ret = -EFBIG; 643 goto fail; 644 } 645 646 size = bat_entry_off(s->bat_size); 647 s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs)); 648 s->header = qemu_try_blockalign(bs->file->bs, s->header_size); 649 if (s->header == NULL) { 650 ret = -ENOMEM; 651 goto fail; 652 } 653 s->data_end = le32_to_cpu(ph.data_off); 654 if (s->data_end == 0) { 655 s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE); 656 } 657 if (s->data_end < s->header_size) { 658 /* there is not enough unused space to fit to block align between BAT 659 and actual data. We can't avoid read-modify-write... */ 660 s->header_size = size; 661 } 662 663 ret = bdrv_pread(bs->file, 0, s->header, s->header_size); 664 if (ret < 0) { 665 goto fail; 666 } 667 s->bat_bitmap = (uint32_t *)(s->header + 1); 668 669 for (i = 0; i < s->bat_size; i++) { 670 int64_t off = bat2sect(s, i); 671 if (off >= s->data_end) { 672 s->data_end = off + s->tracks; 673 } 674 } 675 676 if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) { 677 /* Image was not closed correctly. The check is mandatory */ 678 s->header_unclean = true; 679 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { 680 error_setg(errp, "parallels: Image was not closed correctly; " 681 "cannot be opened read/write"); 682 ret = -EACCES; 683 goto fail; 684 } 685 } 686 687 opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, &local_err); 688 if (local_err != NULL) { 689 goto fail_options; 690 } 691 692 qemu_opts_absorb_qdict(opts, options, &local_err); 693 if (local_err != NULL) { 694 goto fail_options; 695 } 696 697 s->prealloc_size = 698 qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0); 699 s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS); 700 buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE); 701 s->prealloc_mode = qapi_enum_parse(&prealloc_mode_lookup, buf, 702 PRL_PREALLOC_MODE_FALLOCATE, 703 &local_err); 704 g_free(buf); 705 if (local_err != NULL) { 706 goto fail_options; 707 } 708 709 if (!bdrv_has_zero_init(bs->file->bs)) { 710 s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE; 711 } 712 713 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_INACTIVE)) { 714 s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC); 715 ret = parallels_update_header(bs); 716 if (ret < 0) { 717 goto fail; 718 } 719 } 720 721 s->bat_dirty_block = 4 * getpagesize(); 722 s->bat_dirty_bmap = 723 bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block)); 724 725 /* Disable migration until bdrv_invalidate_cache method is added */ 726 error_setg(&s->migration_blocker, "The Parallels format used by node '%s' " 727 "does not support live migration", 728 bdrv_get_device_or_node_name(bs)); 729 ret = migrate_add_blocker(s->migration_blocker, &local_err); 730 if (local_err) { 731 error_propagate(errp, local_err); 732 error_free(s->migration_blocker); 733 goto fail; 734 } 735 qemu_co_mutex_init(&s->lock); 736 return 0; 737 738 fail_format: 739 error_setg(errp, "Image not in Parallels format"); 740 ret = -EINVAL; 741 fail: 742 qemu_vfree(s->header); 743 return ret; 744 745 fail_options: 746 error_propagate(errp, local_err); 747 ret = -EINVAL; 748 goto fail; 749 } 750 751 752 static void parallels_close(BlockDriverState *bs) 753 { 754 BDRVParallelsState *s = bs->opaque; 755 756 if ((bs->open_flags & BDRV_O_RDWR) && !(bs->open_flags & BDRV_O_INACTIVE)) { 757 s->header->inuse = 0; 758 parallels_update_header(bs); 759 bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS, 760 PREALLOC_MODE_OFF, NULL); 761 } 762 763 g_free(s->bat_dirty_bmap); 764 qemu_vfree(s->header); 765 766 migrate_del_blocker(s->migration_blocker); 767 error_free(s->migration_blocker); 768 } 769 770 static QemuOptsList parallels_create_opts = { 771 .name = "parallels-create-opts", 772 .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head), 773 .desc = { 774 { 775 .name = BLOCK_OPT_SIZE, 776 .type = QEMU_OPT_SIZE, 777 .help = "Virtual disk size", 778 }, 779 { 780 .name = BLOCK_OPT_CLUSTER_SIZE, 781 .type = QEMU_OPT_SIZE, 782 .help = "Parallels image cluster size", 783 .def_value_str = stringify(DEFAULT_CLUSTER_SIZE), 784 }, 785 { /* end of list */ } 786 } 787 }; 788 789 static BlockDriver bdrv_parallels = { 790 .format_name = "parallels", 791 .instance_size = sizeof(BDRVParallelsState), 792 .bdrv_probe = parallels_probe, 793 .bdrv_open = parallels_open, 794 .bdrv_close = parallels_close, 795 .bdrv_child_perm = bdrv_format_default_perms, 796 .bdrv_co_get_block_status = parallels_co_get_block_status, 797 .bdrv_has_zero_init = bdrv_has_zero_init_1, 798 .bdrv_co_flush_to_os = parallels_co_flush_to_os, 799 .bdrv_co_readv = parallels_co_readv, 800 .bdrv_co_writev = parallels_co_writev, 801 802 .bdrv_create = parallels_create, 803 .bdrv_check = parallels_check, 804 .create_opts = ¶llels_create_opts, 805 }; 806 807 static void bdrv_parallels_init(void) 808 { 809 bdrv_register(&bdrv_parallels); 810 } 811 812 block_init(bdrv_parallels_init); 813