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 31 #include "qemu/osdep.h" 32 #include "qapi/error.h" 33 #include "block/block_int.h" 34 #include "sysemu/block-backend.h" 35 #include "qemu/module.h" 36 #include "qemu/option.h" 37 #include "qemu/bswap.h" 38 #include "qemu/bitmap.h" 39 #include "migration/blocker.h" 40 #include "parallels.h" 41 42 /**************************************************************/ 43 44 #define HEADER_MAGIC "WithoutFreeSpace" 45 #define HEADER_MAGIC2 "WithouFreSpacExt" 46 #define HEADER_VERSION 2 47 #define HEADER_INUSE_MAGIC (0x746F6E59) 48 #define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32) 49 50 static QEnumLookup prealloc_mode_lookup = { 51 .array = (const char *const[]) { 52 "falloc", 53 "truncate", 54 }, 55 .size = PRL_PREALLOC_MODE__MAX 56 }; 57 58 #define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode" 59 #define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size" 60 61 static QemuOptsList parallels_runtime_opts = { 62 .name = "parallels", 63 .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head), 64 .desc = { 65 { 66 .name = PARALLELS_OPT_PREALLOC_SIZE, 67 .type = QEMU_OPT_SIZE, 68 .help = "Preallocation size on image expansion", 69 .def_value_str = "128M", 70 }, 71 { 72 .name = PARALLELS_OPT_PREALLOC_MODE, 73 .type = QEMU_OPT_STRING, 74 .help = "Preallocation mode on image expansion " 75 "(allowed values: falloc, truncate)", 76 .def_value_str = "falloc", 77 }, 78 { /* end of list */ }, 79 }, 80 }; 81 82 83 static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx) 84 { 85 return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier; 86 } 87 88 static uint32_t bat_entry_off(uint32_t idx) 89 { 90 return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx; 91 } 92 93 static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num) 94 { 95 uint32_t index, offset; 96 97 index = sector_num / s->tracks; 98 offset = sector_num % s->tracks; 99 100 /* not allocated */ 101 if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) { 102 return -1; 103 } 104 return bat2sect(s, index) + offset; 105 } 106 107 static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num, 108 int nb_sectors) 109 { 110 int ret = s->tracks - sector_num % s->tracks; 111 return MIN(nb_sectors, ret); 112 } 113 114 static int64_t block_status(BDRVParallelsState *s, int64_t sector_num, 115 int nb_sectors, int *pnum) 116 { 117 int64_t start_off = -2, prev_end_off = -2; 118 119 *pnum = 0; 120 while (nb_sectors > 0 || start_off == -2) { 121 int64_t offset = seek_to_sector(s, sector_num); 122 int to_end; 123 124 if (start_off == -2) { 125 start_off = offset; 126 prev_end_off = offset; 127 } else if (offset != prev_end_off) { 128 break; 129 } 130 131 to_end = cluster_remainder(s, sector_num, nb_sectors); 132 nb_sectors -= to_end; 133 sector_num += to_end; 134 *pnum += to_end; 135 136 if (offset > 0) { 137 prev_end_off += to_end; 138 } 139 } 140 return start_off; 141 } 142 143 static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num, 144 int nb_sectors, int *pnum) 145 { 146 int ret; 147 BDRVParallelsState *s = bs->opaque; 148 int64_t pos, space, idx, to_allocate, i, len; 149 150 pos = block_status(s, sector_num, nb_sectors, pnum); 151 if (pos > 0) { 152 return pos; 153 } 154 155 idx = sector_num / s->tracks; 156 to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx; 157 158 /* This function is called only by parallels_co_writev(), which will never 159 * pass a sector_num at or beyond the end of the image (because the block 160 * layer never passes such a sector_num to that function). Therefore, idx 161 * is always below s->bat_size. 162 * block_status() will limit *pnum so that sector_num + *pnum will not 163 * exceed the image end. Therefore, idx + to_allocate cannot exceed 164 * s->bat_size. 165 * Note that s->bat_size is an unsigned int, therefore idx + to_allocate 166 * will always fit into a uint32_t. */ 167 assert(idx < s->bat_size && idx + to_allocate <= s->bat_size); 168 169 space = to_allocate * s->tracks; 170 len = bdrv_getlength(bs->file->bs); 171 if (len < 0) { 172 return len; 173 } 174 if (s->data_end + space > (len >> BDRV_SECTOR_BITS)) { 175 space += s->prealloc_size; 176 if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) { 177 ret = bdrv_pwrite_zeroes(bs->file, 178 s->data_end << BDRV_SECTOR_BITS, 179 space << BDRV_SECTOR_BITS, 0); 180 } else { 181 ret = bdrv_truncate(bs->file, 182 (s->data_end + space) << BDRV_SECTOR_BITS, 183 PREALLOC_MODE_OFF, NULL); 184 } 185 if (ret < 0) { 186 return ret; 187 } 188 } 189 190 /* Try to read from backing to fill empty clusters 191 * FIXME: 1. previous write_zeroes may be redundant 192 * 2. most of data we read from backing will be rewritten by 193 * parallels_co_writev. On aligned-to-cluster write we do not need 194 * this read at all. 195 * 3. it would be good to combine write of data from backing and new 196 * data into one write call */ 197 if (bs->backing) { 198 int64_t nb_cow_sectors = to_allocate * s->tracks; 199 int64_t nb_cow_bytes = nb_cow_sectors << BDRV_SECTOR_BITS; 200 QEMUIOVector qiov; 201 struct iovec iov = { 202 .iov_len = nb_cow_bytes, 203 .iov_base = qemu_blockalign(bs, nb_cow_bytes) 204 }; 205 qemu_iovec_init_external(&qiov, &iov, 1); 206 207 ret = bdrv_co_readv(bs->backing, idx * s->tracks, nb_cow_sectors, 208 &qiov); 209 if (ret < 0) { 210 qemu_vfree(iov.iov_base); 211 return ret; 212 } 213 214 ret = bdrv_co_writev(bs->file, s->data_end, nb_cow_sectors, &qiov); 215 qemu_vfree(iov.iov_base); 216 if (ret < 0) { 217 return ret; 218 } 219 } 220 221 for (i = 0; i < to_allocate; i++) { 222 s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier); 223 s->data_end += s->tracks; 224 bitmap_set(s->bat_dirty_bmap, 225 bat_entry_off(idx + i) / s->bat_dirty_block, 1); 226 } 227 228 return bat2sect(s, idx) + sector_num % s->tracks; 229 } 230 231 232 static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs) 233 { 234 BDRVParallelsState *s = bs->opaque; 235 unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block); 236 unsigned long bit; 237 238 qemu_co_mutex_lock(&s->lock); 239 240 bit = find_first_bit(s->bat_dirty_bmap, size); 241 while (bit < size) { 242 uint32_t off = bit * s->bat_dirty_block; 243 uint32_t to_write = s->bat_dirty_block; 244 int ret; 245 246 if (off + to_write > s->header_size) { 247 to_write = s->header_size - off; 248 } 249 ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off, 250 to_write); 251 if (ret < 0) { 252 qemu_co_mutex_unlock(&s->lock); 253 return ret; 254 } 255 bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1); 256 } 257 bitmap_zero(s->bat_dirty_bmap, size); 258 259 qemu_co_mutex_unlock(&s->lock); 260 return 0; 261 } 262 263 264 static int coroutine_fn parallels_co_block_status(BlockDriverState *bs, 265 bool want_zero, 266 int64_t offset, 267 int64_t bytes, 268 int64_t *pnum, 269 int64_t *map, 270 BlockDriverState **file) 271 { 272 BDRVParallelsState *s = bs->opaque; 273 int count; 274 275 assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE)); 276 qemu_co_mutex_lock(&s->lock); 277 offset = block_status(s, offset >> BDRV_SECTOR_BITS, 278 bytes >> BDRV_SECTOR_BITS, &count); 279 qemu_co_mutex_unlock(&s->lock); 280 281 *pnum = count * BDRV_SECTOR_SIZE; 282 if (offset < 0) { 283 return 0; 284 } 285 286 *map = offset * BDRV_SECTOR_SIZE; 287 *file = bs->file->bs; 288 return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 289 } 290 291 static coroutine_fn int parallels_co_writev(BlockDriverState *bs, 292 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) 293 { 294 BDRVParallelsState *s = bs->opaque; 295 uint64_t bytes_done = 0; 296 QEMUIOVector hd_qiov; 297 int ret = 0; 298 299 qemu_iovec_init(&hd_qiov, qiov->niov); 300 301 while (nb_sectors > 0) { 302 int64_t position; 303 int n, nbytes; 304 305 qemu_co_mutex_lock(&s->lock); 306 position = allocate_clusters(bs, sector_num, nb_sectors, &n); 307 qemu_co_mutex_unlock(&s->lock); 308 if (position < 0) { 309 ret = (int)position; 310 break; 311 } 312 313 nbytes = n << BDRV_SECTOR_BITS; 314 315 qemu_iovec_reset(&hd_qiov); 316 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 317 318 ret = bdrv_co_writev(bs->file, position, n, &hd_qiov); 319 if (ret < 0) { 320 break; 321 } 322 323 nb_sectors -= n; 324 sector_num += n; 325 bytes_done += nbytes; 326 } 327 328 qemu_iovec_destroy(&hd_qiov); 329 return ret; 330 } 331 332 static coroutine_fn int parallels_co_readv(BlockDriverState *bs, 333 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) 334 { 335 BDRVParallelsState *s = bs->opaque; 336 uint64_t bytes_done = 0; 337 QEMUIOVector hd_qiov; 338 int ret = 0; 339 340 qemu_iovec_init(&hd_qiov, qiov->niov); 341 342 while (nb_sectors > 0) { 343 int64_t position; 344 int n, nbytes; 345 346 qemu_co_mutex_lock(&s->lock); 347 position = block_status(s, sector_num, nb_sectors, &n); 348 qemu_co_mutex_unlock(&s->lock); 349 350 nbytes = n << BDRV_SECTOR_BITS; 351 352 qemu_iovec_reset(&hd_qiov); 353 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 354 355 if (position < 0) { 356 if (bs->backing) { 357 ret = bdrv_co_readv(bs->backing, sector_num, n, &hd_qiov); 358 if (ret < 0) { 359 break; 360 } 361 } else { 362 qemu_iovec_memset(&hd_qiov, 0, 0, nbytes); 363 } 364 } else { 365 ret = bdrv_co_readv(bs->file, position, n, &hd_qiov); 366 if (ret < 0) { 367 break; 368 } 369 } 370 371 nb_sectors -= n; 372 sector_num += n; 373 bytes_done += nbytes; 374 } 375 376 qemu_iovec_destroy(&hd_qiov); 377 return ret; 378 } 379 380 381 static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res, 382 BdrvCheckMode fix) 383 { 384 BDRVParallelsState *s = bs->opaque; 385 int64_t size, prev_off, high_off; 386 int ret; 387 uint32_t i; 388 bool flush_bat = false; 389 int cluster_size = s->tracks << BDRV_SECTOR_BITS; 390 391 size = bdrv_getlength(bs->file->bs); 392 if (size < 0) { 393 res->check_errors++; 394 return size; 395 } 396 397 if (s->header_unclean) { 398 fprintf(stderr, "%s image was not closed correctly\n", 399 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR"); 400 res->corruptions++; 401 if (fix & BDRV_FIX_ERRORS) { 402 /* parallels_close will do the job right */ 403 res->corruptions_fixed++; 404 s->header_unclean = false; 405 } 406 } 407 408 res->bfi.total_clusters = s->bat_size; 409 res->bfi.compressed_clusters = 0; /* compression is not supported */ 410 411 high_off = 0; 412 prev_off = 0; 413 for (i = 0; i < s->bat_size; i++) { 414 int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS; 415 if (off == 0) { 416 prev_off = 0; 417 continue; 418 } 419 420 /* cluster outside the image */ 421 if (off > size) { 422 fprintf(stderr, "%s cluster %u is outside image\n", 423 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); 424 res->corruptions++; 425 if (fix & BDRV_FIX_ERRORS) { 426 prev_off = 0; 427 s->bat_bitmap[i] = 0; 428 res->corruptions_fixed++; 429 flush_bat = true; 430 continue; 431 } 432 } 433 434 res->bfi.allocated_clusters++; 435 if (off > high_off) { 436 high_off = off; 437 } 438 439 if (prev_off != 0 && (prev_off + cluster_size) != off) { 440 res->bfi.fragmented_clusters++; 441 } 442 prev_off = off; 443 } 444 445 if (flush_bat) { 446 ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size); 447 if (ret < 0) { 448 res->check_errors++; 449 return ret; 450 } 451 } 452 453 res->image_end_offset = high_off + cluster_size; 454 if (size > res->image_end_offset) { 455 int64_t count; 456 count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size); 457 fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n", 458 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR", 459 size - res->image_end_offset); 460 res->leaks += count; 461 if (fix & BDRV_FIX_LEAKS) { 462 Error *local_err = NULL; 463 ret = bdrv_truncate(bs->file, res->image_end_offset, 464 PREALLOC_MODE_OFF, &local_err); 465 if (ret < 0) { 466 error_report_err(local_err); 467 res->check_errors++; 468 return ret; 469 } 470 res->leaks_fixed += count; 471 } 472 } 473 474 return 0; 475 } 476 477 478 static int coroutine_fn parallels_co_create_opts(const char *filename, 479 QemuOpts *opts, 480 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(HEADS_NUMBER); 529 header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE 530 / HEADS_NUMBER / SEC_IN_CYL); 531 header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS); 532 header.bat_entries = cpu_to_le32(bat_entries); 533 header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE)); 534 header.data_off = cpu_to_le32(bat_sectors); 535 536 /* write all the data */ 537 memset(tmp, 0, sizeof(tmp)); 538 memcpy(tmp, &header, sizeof(header)); 539 540 ret = blk_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE, 0); 541 if (ret < 0) { 542 goto exit; 543 } 544 ret = blk_pwrite_zeroes(file, BDRV_SECTOR_SIZE, 545 (bat_sectors - 1) << BDRV_SECTOR_BITS, 0); 546 if (ret < 0) { 547 goto exit; 548 } 549 ret = 0; 550 551 done: 552 blk_unref(file); 553 return ret; 554 555 exit: 556 error_setg_errno(errp, -ret, "Failed to create Parallels image"); 557 goto done; 558 } 559 560 561 static int parallels_probe(const uint8_t *buf, int buf_size, 562 const char *filename) 563 { 564 const ParallelsHeader *ph = (const void *)buf; 565 566 if (buf_size < sizeof(ParallelsHeader)) { 567 return 0; 568 } 569 570 if ((!memcmp(ph->magic, HEADER_MAGIC, 16) || 571 !memcmp(ph->magic, HEADER_MAGIC2, 16)) && 572 (le32_to_cpu(ph->version) == HEADER_VERSION)) { 573 return 100; 574 } 575 576 return 0; 577 } 578 579 static int parallels_update_header(BlockDriverState *bs) 580 { 581 BDRVParallelsState *s = bs->opaque; 582 unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs), 583 sizeof(ParallelsHeader)); 584 585 if (size > s->header_size) { 586 size = s->header_size; 587 } 588 return bdrv_pwrite_sync(bs->file, 0, s->header, size); 589 } 590 591 static int parallels_open(BlockDriverState *bs, QDict *options, int flags, 592 Error **errp) 593 { 594 BDRVParallelsState *s = bs->opaque; 595 ParallelsHeader ph; 596 int ret, size, i; 597 QemuOpts *opts = NULL; 598 Error *local_err = NULL; 599 char *buf; 600 601 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 602 false, errp); 603 if (!bs->file) { 604 return -EINVAL; 605 } 606 607 ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph)); 608 if (ret < 0) { 609 goto fail; 610 } 611 612 bs->total_sectors = le64_to_cpu(ph.nb_sectors); 613 614 if (le32_to_cpu(ph.version) != HEADER_VERSION) { 615 goto fail_format; 616 } 617 if (!memcmp(ph.magic, HEADER_MAGIC, 16)) { 618 s->off_multiplier = 1; 619 bs->total_sectors = 0xffffffff & bs->total_sectors; 620 } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) { 621 s->off_multiplier = le32_to_cpu(ph.tracks); 622 } else { 623 goto fail_format; 624 } 625 626 s->tracks = le32_to_cpu(ph.tracks); 627 if (s->tracks == 0) { 628 error_setg(errp, "Invalid image: Zero sectors per track"); 629 ret = -EINVAL; 630 goto fail; 631 } 632 if (s->tracks > INT32_MAX/513) { 633 error_setg(errp, "Invalid image: Too big cluster"); 634 ret = -EFBIG; 635 goto fail; 636 } 637 638 s->bat_size = le32_to_cpu(ph.bat_entries); 639 if (s->bat_size > INT_MAX / sizeof(uint32_t)) { 640 error_setg(errp, "Catalog too large"); 641 ret = -EFBIG; 642 goto fail; 643 } 644 645 size = bat_entry_off(s->bat_size); 646 s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs)); 647 s->header = qemu_try_blockalign(bs->file->bs, s->header_size); 648 if (s->header == NULL) { 649 ret = -ENOMEM; 650 goto fail; 651 } 652 s->data_end = le32_to_cpu(ph.data_off); 653 if (s->data_end == 0) { 654 s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE); 655 } 656 if (s->data_end < s->header_size) { 657 /* there is not enough unused space to fit to block align between BAT 658 and actual data. We can't avoid read-modify-write... */ 659 s->header_size = size; 660 } 661 662 ret = bdrv_pread(bs->file, 0, s->header, s->header_size); 663 if (ret < 0) { 664 goto fail; 665 } 666 s->bat_bitmap = (uint32_t *)(s->header + 1); 667 668 for (i = 0; i < s->bat_size; i++) { 669 int64_t off = bat2sect(s, i); 670 if (off >= s->data_end) { 671 s->data_end = off + s->tracks; 672 } 673 } 674 675 if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) { 676 /* Image was not closed correctly. The check is mandatory */ 677 s->header_unclean = true; 678 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { 679 error_setg(errp, "parallels: Image was not closed correctly; " 680 "cannot be opened read/write"); 681 ret = -EACCES; 682 goto fail; 683 } 684 } 685 686 opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, &local_err); 687 if (local_err != NULL) { 688 goto fail_options; 689 } 690 691 qemu_opts_absorb_qdict(opts, options, &local_err); 692 if (local_err != NULL) { 693 goto fail_options; 694 } 695 696 s->prealloc_size = 697 qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0); 698 s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS); 699 buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE); 700 s->prealloc_mode = qapi_enum_parse(&prealloc_mode_lookup, buf, 701 PRL_PREALLOC_MODE_FALLOCATE, 702 &local_err); 703 g_free(buf); 704 if (local_err != NULL) { 705 goto fail_options; 706 } 707 708 if (!bdrv_has_zero_init(bs->file->bs)) { 709 s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE; 710 } 711 712 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_INACTIVE)) { 713 s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC); 714 ret = parallels_update_header(bs); 715 if (ret < 0) { 716 goto fail; 717 } 718 } 719 720 s->bat_dirty_block = 4 * getpagesize(); 721 s->bat_dirty_bmap = 722 bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block)); 723 724 /* Disable migration until bdrv_invalidate_cache method is added */ 725 error_setg(&s->migration_blocker, "The Parallels format used by node '%s' " 726 "does not support live migration", 727 bdrv_get_device_or_node_name(bs)); 728 ret = migrate_add_blocker(s->migration_blocker, &local_err); 729 if (local_err) { 730 error_propagate(errp, local_err); 731 error_free(s->migration_blocker); 732 goto fail; 733 } 734 qemu_co_mutex_init(&s->lock); 735 return 0; 736 737 fail_format: 738 error_setg(errp, "Image not in Parallels format"); 739 ret = -EINVAL; 740 fail: 741 qemu_vfree(s->header); 742 return ret; 743 744 fail_options: 745 error_propagate(errp, local_err); 746 ret = -EINVAL; 747 goto fail; 748 } 749 750 751 static void parallels_close(BlockDriverState *bs) 752 { 753 BDRVParallelsState *s = bs->opaque; 754 755 if ((bs->open_flags & BDRV_O_RDWR) && !(bs->open_flags & BDRV_O_INACTIVE)) { 756 s->header->inuse = 0; 757 parallels_update_header(bs); 758 bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS, 759 PREALLOC_MODE_OFF, NULL); 760 } 761 762 g_free(s->bat_dirty_bmap); 763 qemu_vfree(s->header); 764 765 migrate_del_blocker(s->migration_blocker); 766 error_free(s->migration_blocker); 767 } 768 769 static QemuOptsList parallels_create_opts = { 770 .name = "parallels-create-opts", 771 .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head), 772 .desc = { 773 { 774 .name = BLOCK_OPT_SIZE, 775 .type = QEMU_OPT_SIZE, 776 .help = "Virtual disk size", 777 }, 778 { 779 .name = BLOCK_OPT_CLUSTER_SIZE, 780 .type = QEMU_OPT_SIZE, 781 .help = "Parallels image cluster size", 782 .def_value_str = stringify(DEFAULT_CLUSTER_SIZE), 783 }, 784 { /* end of list */ } 785 } 786 }; 787 788 static BlockDriver bdrv_parallels = { 789 .format_name = "parallels", 790 .instance_size = sizeof(BDRVParallelsState), 791 .bdrv_probe = parallels_probe, 792 .bdrv_open = parallels_open, 793 .bdrv_close = parallels_close, 794 .bdrv_child_perm = bdrv_format_default_perms, 795 .bdrv_co_block_status = parallels_co_block_status, 796 .bdrv_has_zero_init = bdrv_has_zero_init_1, 797 .bdrv_co_flush_to_os = parallels_co_flush_to_os, 798 .bdrv_co_readv = parallels_co_readv, 799 .bdrv_co_writev = parallels_co_writev, 800 .supports_backing = true, 801 .bdrv_co_create_opts = parallels_co_create_opts, 802 .bdrv_check = parallels_check, 803 .create_opts = ¶llels_create_opts, 804 }; 805 806 static void bdrv_parallels_init(void) 807 { 808 bdrv_register(&bdrv_parallels); 809 } 810 811 block_init(bdrv_parallels_init); 812