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 int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs, 265 int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) 266 { 267 BDRVParallelsState *s = bs->opaque; 268 int64_t offset; 269 270 qemu_co_mutex_lock(&s->lock); 271 offset = block_status(s, sector_num, nb_sectors, pnum); 272 qemu_co_mutex_unlock(&s->lock); 273 274 if (offset < 0) { 275 return 0; 276 } 277 278 *file = bs->file->bs; 279 return (offset << BDRV_SECTOR_BITS) | 280 BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 281 } 282 283 static coroutine_fn int parallels_co_writev(BlockDriverState *bs, 284 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) 285 { 286 BDRVParallelsState *s = bs->opaque; 287 uint64_t bytes_done = 0; 288 QEMUIOVector hd_qiov; 289 int ret = 0; 290 291 qemu_iovec_init(&hd_qiov, qiov->niov); 292 293 while (nb_sectors > 0) { 294 int64_t position; 295 int n, nbytes; 296 297 qemu_co_mutex_lock(&s->lock); 298 position = allocate_clusters(bs, sector_num, nb_sectors, &n); 299 qemu_co_mutex_unlock(&s->lock); 300 if (position < 0) { 301 ret = (int)position; 302 break; 303 } 304 305 nbytes = n << BDRV_SECTOR_BITS; 306 307 qemu_iovec_reset(&hd_qiov); 308 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 309 310 ret = bdrv_co_writev(bs->file, position, n, &hd_qiov); 311 if (ret < 0) { 312 break; 313 } 314 315 nb_sectors -= n; 316 sector_num += n; 317 bytes_done += nbytes; 318 } 319 320 qemu_iovec_destroy(&hd_qiov); 321 return ret; 322 } 323 324 static coroutine_fn int parallels_co_readv(BlockDriverState *bs, 325 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) 326 { 327 BDRVParallelsState *s = bs->opaque; 328 uint64_t bytes_done = 0; 329 QEMUIOVector hd_qiov; 330 int ret = 0; 331 332 qemu_iovec_init(&hd_qiov, qiov->niov); 333 334 while (nb_sectors > 0) { 335 int64_t position; 336 int n, nbytes; 337 338 qemu_co_mutex_lock(&s->lock); 339 position = block_status(s, sector_num, nb_sectors, &n); 340 qemu_co_mutex_unlock(&s->lock); 341 342 nbytes = n << BDRV_SECTOR_BITS; 343 344 qemu_iovec_reset(&hd_qiov); 345 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 346 347 if (position < 0) { 348 if (bs->backing) { 349 ret = bdrv_co_readv(bs->backing, sector_num, n, &hd_qiov); 350 if (ret < 0) { 351 break; 352 } 353 } else { 354 qemu_iovec_memset(&hd_qiov, 0, 0, nbytes); 355 } 356 } else { 357 ret = bdrv_co_readv(bs->file, position, n, &hd_qiov); 358 if (ret < 0) { 359 break; 360 } 361 } 362 363 nb_sectors -= n; 364 sector_num += n; 365 bytes_done += nbytes; 366 } 367 368 qemu_iovec_destroy(&hd_qiov); 369 return ret; 370 } 371 372 373 static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res, 374 BdrvCheckMode fix) 375 { 376 BDRVParallelsState *s = bs->opaque; 377 int64_t size, prev_off, high_off; 378 int ret; 379 uint32_t i; 380 bool flush_bat = false; 381 int cluster_size = s->tracks << BDRV_SECTOR_BITS; 382 383 size = bdrv_getlength(bs->file->bs); 384 if (size < 0) { 385 res->check_errors++; 386 return size; 387 } 388 389 if (s->header_unclean) { 390 fprintf(stderr, "%s image was not closed correctly\n", 391 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR"); 392 res->corruptions++; 393 if (fix & BDRV_FIX_ERRORS) { 394 /* parallels_close will do the job right */ 395 res->corruptions_fixed++; 396 s->header_unclean = false; 397 } 398 } 399 400 res->bfi.total_clusters = s->bat_size; 401 res->bfi.compressed_clusters = 0; /* compression is not supported */ 402 403 high_off = 0; 404 prev_off = 0; 405 for (i = 0; i < s->bat_size; i++) { 406 int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS; 407 if (off == 0) { 408 prev_off = 0; 409 continue; 410 } 411 412 /* cluster outside the image */ 413 if (off > size) { 414 fprintf(stderr, "%s cluster %u is outside image\n", 415 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); 416 res->corruptions++; 417 if (fix & BDRV_FIX_ERRORS) { 418 prev_off = 0; 419 s->bat_bitmap[i] = 0; 420 res->corruptions_fixed++; 421 flush_bat = true; 422 continue; 423 } 424 } 425 426 res->bfi.allocated_clusters++; 427 if (off > high_off) { 428 high_off = off; 429 } 430 431 if (prev_off != 0 && (prev_off + cluster_size) != off) { 432 res->bfi.fragmented_clusters++; 433 } 434 prev_off = off; 435 } 436 437 if (flush_bat) { 438 ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size); 439 if (ret < 0) { 440 res->check_errors++; 441 return ret; 442 } 443 } 444 445 res->image_end_offset = high_off + cluster_size; 446 if (size > res->image_end_offset) { 447 int64_t count; 448 count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size); 449 fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n", 450 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR", 451 size - res->image_end_offset); 452 res->leaks += count; 453 if (fix & BDRV_FIX_LEAKS) { 454 Error *local_err = NULL; 455 ret = bdrv_truncate(bs->file, res->image_end_offset, 456 PREALLOC_MODE_OFF, &local_err); 457 if (ret < 0) { 458 error_report_err(local_err); 459 res->check_errors++; 460 return ret; 461 } 462 res->leaks_fixed += count; 463 } 464 } 465 466 return 0; 467 } 468 469 470 static int parallels_create(const char *filename, QemuOpts *opts, Error **errp) 471 { 472 int64_t total_size, cl_size; 473 uint8_t tmp[BDRV_SECTOR_SIZE]; 474 Error *local_err = NULL; 475 BlockBackend *file; 476 uint32_t bat_entries, bat_sectors; 477 ParallelsHeader header; 478 int ret; 479 480 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 481 BDRV_SECTOR_SIZE); 482 cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE, 483 DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE); 484 if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) { 485 error_propagate(errp, local_err); 486 return -E2BIG; 487 } 488 489 ret = bdrv_create_file(filename, opts, &local_err); 490 if (ret < 0) { 491 error_propagate(errp, local_err); 492 return ret; 493 } 494 495 file = blk_new_open(filename, NULL, NULL, 496 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, 497 &local_err); 498 if (file == NULL) { 499 error_propagate(errp, local_err); 500 return -EIO; 501 } 502 503 blk_set_allow_write_beyond_eof(file, true); 504 505 ret = blk_truncate(file, 0, PREALLOC_MODE_OFF, errp); 506 if (ret < 0) { 507 goto exit; 508 } 509 510 bat_entries = DIV_ROUND_UP(total_size, cl_size); 511 bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size); 512 bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS; 513 514 memset(&header, 0, sizeof(header)); 515 memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic)); 516 header.version = cpu_to_le32(HEADER_VERSION); 517 /* don't care much about geometry, it is not used on image level */ 518 header.heads = cpu_to_le32(HEADS_NUMBER); 519 header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE 520 / HEADS_NUMBER / SEC_IN_CYL); 521 header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS); 522 header.bat_entries = cpu_to_le32(bat_entries); 523 header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE)); 524 header.data_off = cpu_to_le32(bat_sectors); 525 526 /* write all the data */ 527 memset(tmp, 0, sizeof(tmp)); 528 memcpy(tmp, &header, sizeof(header)); 529 530 ret = blk_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE, 0); 531 if (ret < 0) { 532 goto exit; 533 } 534 ret = blk_pwrite_zeroes(file, BDRV_SECTOR_SIZE, 535 (bat_sectors - 1) << BDRV_SECTOR_BITS, 0); 536 if (ret < 0) { 537 goto exit; 538 } 539 ret = 0; 540 541 done: 542 blk_unref(file); 543 return ret; 544 545 exit: 546 error_setg_errno(errp, -ret, "Failed to create Parallels image"); 547 goto done; 548 } 549 550 551 static int parallels_probe(const uint8_t *buf, int buf_size, 552 const char *filename) 553 { 554 const ParallelsHeader *ph = (const void *)buf; 555 556 if (buf_size < sizeof(ParallelsHeader)) { 557 return 0; 558 } 559 560 if ((!memcmp(ph->magic, HEADER_MAGIC, 16) || 561 !memcmp(ph->magic, HEADER_MAGIC2, 16)) && 562 (le32_to_cpu(ph->version) == HEADER_VERSION)) { 563 return 100; 564 } 565 566 return 0; 567 } 568 569 static int parallels_update_header(BlockDriverState *bs) 570 { 571 BDRVParallelsState *s = bs->opaque; 572 unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs), 573 sizeof(ParallelsHeader)); 574 575 if (size > s->header_size) { 576 size = s->header_size; 577 } 578 return bdrv_pwrite_sync(bs->file, 0, s->header, size); 579 } 580 581 static int parallels_open(BlockDriverState *bs, QDict *options, int flags, 582 Error **errp) 583 { 584 BDRVParallelsState *s = bs->opaque; 585 ParallelsHeader ph; 586 int ret, size, i; 587 QemuOpts *opts = NULL; 588 Error *local_err = NULL; 589 char *buf; 590 591 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 592 false, errp); 593 if (!bs->file) { 594 return -EINVAL; 595 } 596 597 ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph)); 598 if (ret < 0) { 599 goto fail; 600 } 601 602 bs->total_sectors = le64_to_cpu(ph.nb_sectors); 603 604 if (le32_to_cpu(ph.version) != HEADER_VERSION) { 605 goto fail_format; 606 } 607 if (!memcmp(ph.magic, HEADER_MAGIC, 16)) { 608 s->off_multiplier = 1; 609 bs->total_sectors = 0xffffffff & bs->total_sectors; 610 } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) { 611 s->off_multiplier = le32_to_cpu(ph.tracks); 612 } else { 613 goto fail_format; 614 } 615 616 s->tracks = le32_to_cpu(ph.tracks); 617 if (s->tracks == 0) { 618 error_setg(errp, "Invalid image: Zero sectors per track"); 619 ret = -EINVAL; 620 goto fail; 621 } 622 if (s->tracks > INT32_MAX/513) { 623 error_setg(errp, "Invalid image: Too big cluster"); 624 ret = -EFBIG; 625 goto fail; 626 } 627 628 s->bat_size = le32_to_cpu(ph.bat_entries); 629 if (s->bat_size > INT_MAX / sizeof(uint32_t)) { 630 error_setg(errp, "Catalog too large"); 631 ret = -EFBIG; 632 goto fail; 633 } 634 635 size = bat_entry_off(s->bat_size); 636 s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs)); 637 s->header = qemu_try_blockalign(bs->file->bs, s->header_size); 638 if (s->header == NULL) { 639 ret = -ENOMEM; 640 goto fail; 641 } 642 s->data_end = le32_to_cpu(ph.data_off); 643 if (s->data_end == 0) { 644 s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE); 645 } 646 if (s->data_end < s->header_size) { 647 /* there is not enough unused space to fit to block align between BAT 648 and actual data. We can't avoid read-modify-write... */ 649 s->header_size = size; 650 } 651 652 ret = bdrv_pread(bs->file, 0, s->header, s->header_size); 653 if (ret < 0) { 654 goto fail; 655 } 656 s->bat_bitmap = (uint32_t *)(s->header + 1); 657 658 for (i = 0; i < s->bat_size; i++) { 659 int64_t off = bat2sect(s, i); 660 if (off >= s->data_end) { 661 s->data_end = off + s->tracks; 662 } 663 } 664 665 if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) { 666 /* Image was not closed correctly. The check is mandatory */ 667 s->header_unclean = true; 668 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { 669 error_setg(errp, "parallels: Image was not closed correctly; " 670 "cannot be opened read/write"); 671 ret = -EACCES; 672 goto fail; 673 } 674 } 675 676 opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, &local_err); 677 if (local_err != NULL) { 678 goto fail_options; 679 } 680 681 qemu_opts_absorb_qdict(opts, options, &local_err); 682 if (local_err != NULL) { 683 goto fail_options; 684 } 685 686 s->prealloc_size = 687 qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0); 688 s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS); 689 buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE); 690 s->prealloc_mode = qapi_enum_parse(&prealloc_mode_lookup, buf, 691 PRL_PREALLOC_MODE_FALLOCATE, 692 &local_err); 693 g_free(buf); 694 if (local_err != NULL) { 695 goto fail_options; 696 } 697 698 if (!bdrv_has_zero_init(bs->file->bs)) { 699 s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE; 700 } 701 702 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_INACTIVE)) { 703 s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC); 704 ret = parallels_update_header(bs); 705 if (ret < 0) { 706 goto fail; 707 } 708 } 709 710 s->bat_dirty_block = 4 * getpagesize(); 711 s->bat_dirty_bmap = 712 bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block)); 713 714 /* Disable migration until bdrv_invalidate_cache method is added */ 715 error_setg(&s->migration_blocker, "The Parallels format used by node '%s' " 716 "does not support live migration", 717 bdrv_get_device_or_node_name(bs)); 718 ret = migrate_add_blocker(s->migration_blocker, &local_err); 719 if (local_err) { 720 error_propagate(errp, local_err); 721 error_free(s->migration_blocker); 722 goto fail; 723 } 724 qemu_co_mutex_init(&s->lock); 725 return 0; 726 727 fail_format: 728 error_setg(errp, "Image not in Parallels format"); 729 ret = -EINVAL; 730 fail: 731 qemu_vfree(s->header); 732 return ret; 733 734 fail_options: 735 error_propagate(errp, local_err); 736 ret = -EINVAL; 737 goto fail; 738 } 739 740 741 static void parallels_close(BlockDriverState *bs) 742 { 743 BDRVParallelsState *s = bs->opaque; 744 745 if ((bs->open_flags & BDRV_O_RDWR) && !(bs->open_flags & BDRV_O_INACTIVE)) { 746 s->header->inuse = 0; 747 parallels_update_header(bs); 748 bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS, 749 PREALLOC_MODE_OFF, NULL); 750 } 751 752 g_free(s->bat_dirty_bmap); 753 qemu_vfree(s->header); 754 755 migrate_del_blocker(s->migration_blocker); 756 error_free(s->migration_blocker); 757 } 758 759 static QemuOptsList parallels_create_opts = { 760 .name = "parallels-create-opts", 761 .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head), 762 .desc = { 763 { 764 .name = BLOCK_OPT_SIZE, 765 .type = QEMU_OPT_SIZE, 766 .help = "Virtual disk size", 767 }, 768 { 769 .name = BLOCK_OPT_CLUSTER_SIZE, 770 .type = QEMU_OPT_SIZE, 771 .help = "Parallels image cluster size", 772 .def_value_str = stringify(DEFAULT_CLUSTER_SIZE), 773 }, 774 { /* end of list */ } 775 } 776 }; 777 778 static BlockDriver bdrv_parallels = { 779 .format_name = "parallels", 780 .instance_size = sizeof(BDRVParallelsState), 781 .bdrv_probe = parallels_probe, 782 .bdrv_open = parallels_open, 783 .bdrv_close = parallels_close, 784 .bdrv_child_perm = bdrv_format_default_perms, 785 .bdrv_co_get_block_status = parallels_co_get_block_status, 786 .bdrv_has_zero_init = bdrv_has_zero_init_1, 787 .bdrv_co_flush_to_os = parallels_co_flush_to_os, 788 .bdrv_co_readv = parallels_co_readv, 789 .bdrv_co_writev = parallels_co_writev, 790 .supports_backing = true, 791 .bdrv_create = parallels_create, 792 .bdrv_check = parallels_check, 793 .create_opts = ¶llels_create_opts, 794 }; 795 796 static void bdrv_parallels_init(void) 797 { 798 bdrv_register(&bdrv_parallels); 799 } 800 801 block_init(bdrv_parallels_init); 802