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 coroutine_fn parallels_co_check(BlockDriverState *bs, 382 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 qemu_co_mutex_lock(&s->lock); 399 if (s->header_unclean) { 400 fprintf(stderr, "%s image was not closed correctly\n", 401 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR"); 402 res->corruptions++; 403 if (fix & BDRV_FIX_ERRORS) { 404 /* parallels_close will do the job right */ 405 res->corruptions_fixed++; 406 s->header_unclean = false; 407 } 408 } 409 410 res->bfi.total_clusters = s->bat_size; 411 res->bfi.compressed_clusters = 0; /* compression is not supported */ 412 413 high_off = 0; 414 prev_off = 0; 415 for (i = 0; i < s->bat_size; i++) { 416 int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS; 417 if (off == 0) { 418 prev_off = 0; 419 continue; 420 } 421 422 /* cluster outside the image */ 423 if (off > size) { 424 fprintf(stderr, "%s cluster %u is outside image\n", 425 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); 426 res->corruptions++; 427 if (fix & BDRV_FIX_ERRORS) { 428 prev_off = 0; 429 s->bat_bitmap[i] = 0; 430 res->corruptions_fixed++; 431 flush_bat = true; 432 continue; 433 } 434 } 435 436 res->bfi.allocated_clusters++; 437 if (off > high_off) { 438 high_off = off; 439 } 440 441 if (prev_off != 0 && (prev_off + cluster_size) != off) { 442 res->bfi.fragmented_clusters++; 443 } 444 prev_off = off; 445 } 446 447 ret = 0; 448 if (flush_bat) { 449 ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size); 450 if (ret < 0) { 451 res->check_errors++; 452 goto out; 453 } 454 } 455 456 res->image_end_offset = high_off + cluster_size; 457 if (size > res->image_end_offset) { 458 int64_t count; 459 count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size); 460 fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n", 461 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR", 462 size - res->image_end_offset); 463 res->leaks += count; 464 if (fix & BDRV_FIX_LEAKS) { 465 Error *local_err = NULL; 466 ret = bdrv_truncate(bs->file, res->image_end_offset, 467 PREALLOC_MODE_OFF, &local_err); 468 if (ret < 0) { 469 error_report_err(local_err); 470 res->check_errors++; 471 goto out; 472 } 473 res->leaks_fixed += count; 474 } 475 } 476 477 out: 478 qemu_co_mutex_unlock(&s->lock); 479 return ret; 480 } 481 482 483 static int coroutine_fn parallels_co_create_opts(const char *filename, 484 QemuOpts *opts, 485 Error **errp) 486 { 487 int64_t total_size, cl_size; 488 uint8_t tmp[BDRV_SECTOR_SIZE]; 489 Error *local_err = NULL; 490 BlockBackend *file; 491 uint32_t bat_entries, bat_sectors; 492 ParallelsHeader header; 493 int ret; 494 495 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 496 BDRV_SECTOR_SIZE); 497 cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE, 498 DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE); 499 if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) { 500 error_propagate(errp, local_err); 501 return -E2BIG; 502 } 503 504 ret = bdrv_create_file(filename, opts, &local_err); 505 if (ret < 0) { 506 error_propagate(errp, local_err); 507 return ret; 508 } 509 510 file = blk_new_open(filename, NULL, NULL, 511 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, 512 &local_err); 513 if (file == NULL) { 514 error_propagate(errp, local_err); 515 return -EIO; 516 } 517 518 blk_set_allow_write_beyond_eof(file, true); 519 520 ret = blk_truncate(file, 0, PREALLOC_MODE_OFF, errp); 521 if (ret < 0) { 522 goto exit; 523 } 524 525 bat_entries = DIV_ROUND_UP(total_size, cl_size); 526 bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size); 527 bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS; 528 529 memset(&header, 0, sizeof(header)); 530 memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic)); 531 header.version = cpu_to_le32(HEADER_VERSION); 532 /* don't care much about geometry, it is not used on image level */ 533 header.heads = cpu_to_le32(HEADS_NUMBER); 534 header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE 535 / HEADS_NUMBER / SEC_IN_CYL); 536 header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS); 537 header.bat_entries = cpu_to_le32(bat_entries); 538 header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE)); 539 header.data_off = cpu_to_le32(bat_sectors); 540 541 /* write all the data */ 542 memset(tmp, 0, sizeof(tmp)); 543 memcpy(tmp, &header, sizeof(header)); 544 545 ret = blk_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE, 0); 546 if (ret < 0) { 547 goto exit; 548 } 549 ret = blk_pwrite_zeroes(file, BDRV_SECTOR_SIZE, 550 (bat_sectors - 1) << BDRV_SECTOR_BITS, 0); 551 if (ret < 0) { 552 goto exit; 553 } 554 ret = 0; 555 556 done: 557 blk_unref(file); 558 return ret; 559 560 exit: 561 error_setg_errno(errp, -ret, "Failed to create Parallels image"); 562 goto done; 563 } 564 565 566 static int parallels_probe(const uint8_t *buf, int buf_size, 567 const char *filename) 568 { 569 const ParallelsHeader *ph = (const void *)buf; 570 571 if (buf_size < sizeof(ParallelsHeader)) { 572 return 0; 573 } 574 575 if ((!memcmp(ph->magic, HEADER_MAGIC, 16) || 576 !memcmp(ph->magic, HEADER_MAGIC2, 16)) && 577 (le32_to_cpu(ph->version) == HEADER_VERSION)) { 578 return 100; 579 } 580 581 return 0; 582 } 583 584 static int parallels_update_header(BlockDriverState *bs) 585 { 586 BDRVParallelsState *s = bs->opaque; 587 unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs), 588 sizeof(ParallelsHeader)); 589 590 if (size > s->header_size) { 591 size = s->header_size; 592 } 593 return bdrv_pwrite_sync(bs->file, 0, s->header, size); 594 } 595 596 static int parallels_open(BlockDriverState *bs, QDict *options, int flags, 597 Error **errp) 598 { 599 BDRVParallelsState *s = bs->opaque; 600 ParallelsHeader ph; 601 int ret, size, i; 602 QemuOpts *opts = NULL; 603 Error *local_err = NULL; 604 char *buf; 605 606 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 607 false, errp); 608 if (!bs->file) { 609 return -EINVAL; 610 } 611 612 ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph)); 613 if (ret < 0) { 614 goto fail; 615 } 616 617 bs->total_sectors = le64_to_cpu(ph.nb_sectors); 618 619 if (le32_to_cpu(ph.version) != HEADER_VERSION) { 620 goto fail_format; 621 } 622 if (!memcmp(ph.magic, HEADER_MAGIC, 16)) { 623 s->off_multiplier = 1; 624 bs->total_sectors = 0xffffffff & bs->total_sectors; 625 } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) { 626 s->off_multiplier = le32_to_cpu(ph.tracks); 627 } else { 628 goto fail_format; 629 } 630 631 s->tracks = le32_to_cpu(ph.tracks); 632 if (s->tracks == 0) { 633 error_setg(errp, "Invalid image: Zero sectors per track"); 634 ret = -EINVAL; 635 goto fail; 636 } 637 if (s->tracks > INT32_MAX/513) { 638 error_setg(errp, "Invalid image: Too big cluster"); 639 ret = -EFBIG; 640 goto fail; 641 } 642 643 s->bat_size = le32_to_cpu(ph.bat_entries); 644 if (s->bat_size > INT_MAX / sizeof(uint32_t)) { 645 error_setg(errp, "Catalog too large"); 646 ret = -EFBIG; 647 goto fail; 648 } 649 650 size = bat_entry_off(s->bat_size); 651 s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs)); 652 s->header = qemu_try_blockalign(bs->file->bs, s->header_size); 653 if (s->header == NULL) { 654 ret = -ENOMEM; 655 goto fail; 656 } 657 s->data_end = le32_to_cpu(ph.data_off); 658 if (s->data_end == 0) { 659 s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE); 660 } 661 if (s->data_end < s->header_size) { 662 /* there is not enough unused space to fit to block align between BAT 663 and actual data. We can't avoid read-modify-write... */ 664 s->header_size = size; 665 } 666 667 ret = bdrv_pread(bs->file, 0, s->header, s->header_size); 668 if (ret < 0) { 669 goto fail; 670 } 671 s->bat_bitmap = (uint32_t *)(s->header + 1); 672 673 for (i = 0; i < s->bat_size; i++) { 674 int64_t off = bat2sect(s, i); 675 if (off >= s->data_end) { 676 s->data_end = off + s->tracks; 677 } 678 } 679 680 if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) { 681 /* Image was not closed correctly. The check is mandatory */ 682 s->header_unclean = true; 683 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { 684 error_setg(errp, "parallels: Image was not closed correctly; " 685 "cannot be opened read/write"); 686 ret = -EACCES; 687 goto fail; 688 } 689 } 690 691 opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, &local_err); 692 if (local_err != NULL) { 693 goto fail_options; 694 } 695 696 qemu_opts_absorb_qdict(opts, options, &local_err); 697 if (local_err != NULL) { 698 goto fail_options; 699 } 700 701 s->prealloc_size = 702 qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0); 703 s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS); 704 buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE); 705 s->prealloc_mode = qapi_enum_parse(&prealloc_mode_lookup, buf, 706 PRL_PREALLOC_MODE_FALLOCATE, 707 &local_err); 708 g_free(buf); 709 if (local_err != NULL) { 710 goto fail_options; 711 } 712 713 if (!bdrv_has_zero_init(bs->file->bs)) { 714 s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE; 715 } 716 717 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_INACTIVE)) { 718 s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC); 719 ret = parallels_update_header(bs); 720 if (ret < 0) { 721 goto fail; 722 } 723 } 724 725 s->bat_dirty_block = 4 * getpagesize(); 726 s->bat_dirty_bmap = 727 bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block)); 728 729 /* Disable migration until bdrv_invalidate_cache method is added */ 730 error_setg(&s->migration_blocker, "The Parallels format used by node '%s' " 731 "does not support live migration", 732 bdrv_get_device_or_node_name(bs)); 733 ret = migrate_add_blocker(s->migration_blocker, &local_err); 734 if (local_err) { 735 error_propagate(errp, local_err); 736 error_free(s->migration_blocker); 737 goto fail; 738 } 739 qemu_co_mutex_init(&s->lock); 740 return 0; 741 742 fail_format: 743 error_setg(errp, "Image not in Parallels format"); 744 ret = -EINVAL; 745 fail: 746 qemu_vfree(s->header); 747 return ret; 748 749 fail_options: 750 error_propagate(errp, local_err); 751 ret = -EINVAL; 752 goto fail; 753 } 754 755 756 static void parallels_close(BlockDriverState *bs) 757 { 758 BDRVParallelsState *s = bs->opaque; 759 760 if ((bs->open_flags & BDRV_O_RDWR) && !(bs->open_flags & BDRV_O_INACTIVE)) { 761 s->header->inuse = 0; 762 parallels_update_header(bs); 763 bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS, 764 PREALLOC_MODE_OFF, NULL); 765 } 766 767 g_free(s->bat_dirty_bmap); 768 qemu_vfree(s->header); 769 770 migrate_del_blocker(s->migration_blocker); 771 error_free(s->migration_blocker); 772 } 773 774 static QemuOptsList parallels_create_opts = { 775 .name = "parallels-create-opts", 776 .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head), 777 .desc = { 778 { 779 .name = BLOCK_OPT_SIZE, 780 .type = QEMU_OPT_SIZE, 781 .help = "Virtual disk size", 782 }, 783 { 784 .name = BLOCK_OPT_CLUSTER_SIZE, 785 .type = QEMU_OPT_SIZE, 786 .help = "Parallels image cluster size", 787 .def_value_str = stringify(DEFAULT_CLUSTER_SIZE), 788 }, 789 { /* end of list */ } 790 } 791 }; 792 793 static BlockDriver bdrv_parallels = { 794 .format_name = "parallels", 795 .instance_size = sizeof(BDRVParallelsState), 796 .bdrv_probe = parallels_probe, 797 .bdrv_open = parallels_open, 798 .bdrv_close = parallels_close, 799 .bdrv_child_perm = bdrv_format_default_perms, 800 .bdrv_co_block_status = parallels_co_block_status, 801 .bdrv_has_zero_init = bdrv_has_zero_init_1, 802 .bdrv_co_flush_to_os = parallels_co_flush_to_os, 803 .bdrv_co_readv = parallels_co_readv, 804 .bdrv_co_writev = parallels_co_writev, 805 .supports_backing = true, 806 .bdrv_co_create_opts = parallels_co_create_opts, 807 .bdrv_co_check = parallels_co_check, 808 .create_opts = ¶llels_create_opts, 809 }; 810 811 static void bdrv_parallels_init(void) 812 { 813 bdrv_register(&bdrv_parallels); 814 } 815 816 block_init(bdrv_parallels_init); 817