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 #include "parallels.h" 40 41 /**************************************************************/ 42 43 #define HEADER_MAGIC "WithoutFreeSpace" 44 #define HEADER_MAGIC2 "WithouFreSpacExt" 45 #define HEADER_VERSION 2 46 #define HEADER_INUSE_MAGIC (0x746F6E59) 47 #define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32) 48 49 static QEnumLookup prealloc_mode_lookup = { 50 .array = (const char *const[]) { 51 "falloc", 52 "truncate", 53 }, 54 .size = PRL_PREALLOC_MODE__MAX 55 }; 56 57 #define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode" 58 #define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size" 59 60 static QemuOptsList parallels_runtime_opts = { 61 .name = "parallels", 62 .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head), 63 .desc = { 64 { 65 .name = PARALLELS_OPT_PREALLOC_SIZE, 66 .type = QEMU_OPT_SIZE, 67 .help = "Preallocation size on image expansion", 68 .def_value_str = "128M", 69 }, 70 { 71 .name = PARALLELS_OPT_PREALLOC_MODE, 72 .type = QEMU_OPT_STRING, 73 .help = "Preallocation mode on image expansion " 74 "(allowed values: falloc, truncate)", 75 .def_value_str = "falloc", 76 }, 77 { /* end of list */ }, 78 }, 79 }; 80 81 82 static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx) 83 { 84 return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier; 85 } 86 87 static uint32_t bat_entry_off(uint32_t idx) 88 { 89 return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx; 90 } 91 92 static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num) 93 { 94 uint32_t index, offset; 95 96 index = sector_num / s->tracks; 97 offset = sector_num % s->tracks; 98 99 /* not allocated */ 100 if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) { 101 return -1; 102 } 103 return bat2sect(s, index) + offset; 104 } 105 106 static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num, 107 int nb_sectors) 108 { 109 int ret = s->tracks - sector_num % s->tracks; 110 return MIN(nb_sectors, ret); 111 } 112 113 static int64_t block_status(BDRVParallelsState *s, int64_t sector_num, 114 int nb_sectors, int *pnum) 115 { 116 int64_t start_off = -2, prev_end_off = -2; 117 118 *pnum = 0; 119 while (nb_sectors > 0 || start_off == -2) { 120 int64_t offset = seek_to_sector(s, sector_num); 121 int to_end; 122 123 if (start_off == -2) { 124 start_off = offset; 125 prev_end_off = offset; 126 } else if (offset != prev_end_off) { 127 break; 128 } 129 130 to_end = cluster_remainder(s, sector_num, nb_sectors); 131 nb_sectors -= to_end; 132 sector_num += to_end; 133 *pnum += to_end; 134 135 if (offset > 0) { 136 prev_end_off += to_end; 137 } 138 } 139 return start_off; 140 } 141 142 static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num, 143 int nb_sectors, int *pnum) 144 { 145 int ret; 146 BDRVParallelsState *s = bs->opaque; 147 int64_t pos, space, idx, to_allocate, i, len; 148 149 pos = block_status(s, sector_num, nb_sectors, pnum); 150 if (pos > 0) { 151 return pos; 152 } 153 154 idx = sector_num / s->tracks; 155 to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx; 156 157 /* This function is called only by parallels_co_writev(), which will never 158 * pass a sector_num at or beyond the end of the image (because the block 159 * layer never passes such a sector_num to that function). Therefore, idx 160 * is always below s->bat_size. 161 * block_status() will limit *pnum so that sector_num + *pnum will not 162 * exceed the image end. Therefore, idx + to_allocate cannot exceed 163 * s->bat_size. 164 * Note that s->bat_size is an unsigned int, therefore idx + to_allocate 165 * will always fit into a uint32_t. */ 166 assert(idx < s->bat_size && idx + to_allocate <= s->bat_size); 167 168 space = to_allocate * s->tracks; 169 len = bdrv_getlength(bs->file->bs); 170 if (len < 0) { 171 return len; 172 } 173 if (s->data_end + space > (len >> BDRV_SECTOR_BITS)) { 174 space += s->prealloc_size; 175 if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) { 176 ret = bdrv_pwrite_zeroes(bs->file, 177 s->data_end << BDRV_SECTOR_BITS, 178 space << BDRV_SECTOR_BITS, 0); 179 } else { 180 ret = bdrv_truncate(bs->file, 181 (s->data_end + space) << BDRV_SECTOR_BITS, 182 PREALLOC_MODE_OFF, NULL); 183 } 184 if (ret < 0) { 185 return ret; 186 } 187 } 188 189 /* Try to read from backing to fill empty clusters 190 * FIXME: 1. previous write_zeroes may be redundant 191 * 2. most of data we read from backing will be rewritten by 192 * parallels_co_writev. On aligned-to-cluster write we do not need 193 * this read at all. 194 * 3. it would be good to combine write of data from backing and new 195 * data into one write call */ 196 if (bs->backing) { 197 int64_t nb_cow_sectors = to_allocate * s->tracks; 198 int64_t nb_cow_bytes = nb_cow_sectors << BDRV_SECTOR_BITS; 199 QEMUIOVector qiov; 200 struct iovec iov = { 201 .iov_len = nb_cow_bytes, 202 .iov_base = qemu_blockalign(bs, nb_cow_bytes) 203 }; 204 qemu_iovec_init_external(&qiov, &iov, 1); 205 206 ret = bdrv_co_readv(bs->backing, idx * s->tracks, nb_cow_sectors, 207 &qiov); 208 if (ret < 0) { 209 qemu_vfree(iov.iov_base); 210 return ret; 211 } 212 213 ret = bdrv_co_writev(bs->file, s->data_end, nb_cow_sectors, &qiov); 214 qemu_vfree(iov.iov_base); 215 if (ret < 0) { 216 return ret; 217 } 218 } 219 220 for (i = 0; i < to_allocate; i++) { 221 s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier); 222 s->data_end += s->tracks; 223 bitmap_set(s->bat_dirty_bmap, 224 bat_entry_off(idx + i) / s->bat_dirty_block, 1); 225 } 226 227 return bat2sect(s, idx) + sector_num % s->tracks; 228 } 229 230 231 static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs) 232 { 233 BDRVParallelsState *s = bs->opaque; 234 unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block); 235 unsigned long bit; 236 237 qemu_co_mutex_lock(&s->lock); 238 239 bit = find_first_bit(s->bat_dirty_bmap, size); 240 while (bit < size) { 241 uint32_t off = bit * s->bat_dirty_block; 242 uint32_t to_write = s->bat_dirty_block; 243 int ret; 244 245 if (off + to_write > s->header_size) { 246 to_write = s->header_size - off; 247 } 248 ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off, 249 to_write); 250 if (ret < 0) { 251 qemu_co_mutex_unlock(&s->lock); 252 return ret; 253 } 254 bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1); 255 } 256 bitmap_zero(s->bat_dirty_bmap, size); 257 258 qemu_co_mutex_unlock(&s->lock); 259 return 0; 260 } 261 262 263 static int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs, 264 int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file) 265 { 266 BDRVParallelsState *s = bs->opaque; 267 int64_t offset; 268 269 qemu_co_mutex_lock(&s->lock); 270 offset = block_status(s, sector_num, nb_sectors, pnum); 271 qemu_co_mutex_unlock(&s->lock); 272 273 if (offset < 0) { 274 return 0; 275 } 276 277 *file = bs->file->bs; 278 return (offset << BDRV_SECTOR_BITS) | 279 BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 280 } 281 282 static coroutine_fn int parallels_co_writev(BlockDriverState *bs, 283 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) 284 { 285 BDRVParallelsState *s = bs->opaque; 286 uint64_t bytes_done = 0; 287 QEMUIOVector hd_qiov; 288 int ret = 0; 289 290 qemu_iovec_init(&hd_qiov, qiov->niov); 291 292 while (nb_sectors > 0) { 293 int64_t position; 294 int n, nbytes; 295 296 qemu_co_mutex_lock(&s->lock); 297 position = allocate_clusters(bs, sector_num, nb_sectors, &n); 298 qemu_co_mutex_unlock(&s->lock); 299 if (position < 0) { 300 ret = (int)position; 301 break; 302 } 303 304 nbytes = n << BDRV_SECTOR_BITS; 305 306 qemu_iovec_reset(&hd_qiov); 307 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 308 309 ret = bdrv_co_writev(bs->file, position, n, &hd_qiov); 310 if (ret < 0) { 311 break; 312 } 313 314 nb_sectors -= n; 315 sector_num += n; 316 bytes_done += nbytes; 317 } 318 319 qemu_iovec_destroy(&hd_qiov); 320 return ret; 321 } 322 323 static coroutine_fn int parallels_co_readv(BlockDriverState *bs, 324 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) 325 { 326 BDRVParallelsState *s = bs->opaque; 327 uint64_t bytes_done = 0; 328 QEMUIOVector hd_qiov; 329 int ret = 0; 330 331 qemu_iovec_init(&hd_qiov, qiov->niov); 332 333 while (nb_sectors > 0) { 334 int64_t position; 335 int n, nbytes; 336 337 qemu_co_mutex_lock(&s->lock); 338 position = block_status(s, sector_num, nb_sectors, &n); 339 qemu_co_mutex_unlock(&s->lock); 340 341 nbytes = n << BDRV_SECTOR_BITS; 342 343 qemu_iovec_reset(&hd_qiov); 344 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 345 346 if (position < 0) { 347 if (bs->backing) { 348 ret = bdrv_co_readv(bs->backing, sector_num, n, &hd_qiov); 349 if (ret < 0) { 350 break; 351 } 352 } else { 353 qemu_iovec_memset(&hd_qiov, 0, 0, nbytes); 354 } 355 } else { 356 ret = bdrv_co_readv(bs->file, position, n, &hd_qiov); 357 if (ret < 0) { 358 break; 359 } 360 } 361 362 nb_sectors -= n; 363 sector_num += n; 364 bytes_done += nbytes; 365 } 366 367 qemu_iovec_destroy(&hd_qiov); 368 return ret; 369 } 370 371 372 static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res, 373 BdrvCheckMode fix) 374 { 375 BDRVParallelsState *s = bs->opaque; 376 int64_t size, prev_off, high_off; 377 int ret; 378 uint32_t i; 379 bool flush_bat = false; 380 int cluster_size = s->tracks << BDRV_SECTOR_BITS; 381 382 size = bdrv_getlength(bs->file->bs); 383 if (size < 0) { 384 res->check_errors++; 385 return size; 386 } 387 388 if (s->header_unclean) { 389 fprintf(stderr, "%s image was not closed correctly\n", 390 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR"); 391 res->corruptions++; 392 if (fix & BDRV_FIX_ERRORS) { 393 /* parallels_close will do the job right */ 394 res->corruptions_fixed++; 395 s->header_unclean = false; 396 } 397 } 398 399 res->bfi.total_clusters = s->bat_size; 400 res->bfi.compressed_clusters = 0; /* compression is not supported */ 401 402 high_off = 0; 403 prev_off = 0; 404 for (i = 0; i < s->bat_size; i++) { 405 int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS; 406 if (off == 0) { 407 prev_off = 0; 408 continue; 409 } 410 411 /* cluster outside the image */ 412 if (off > size) { 413 fprintf(stderr, "%s cluster %u is outside image\n", 414 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); 415 res->corruptions++; 416 if (fix & BDRV_FIX_ERRORS) { 417 prev_off = 0; 418 s->bat_bitmap[i] = 0; 419 res->corruptions_fixed++; 420 flush_bat = true; 421 continue; 422 } 423 } 424 425 res->bfi.allocated_clusters++; 426 if (off > high_off) { 427 high_off = off; 428 } 429 430 if (prev_off != 0 && (prev_off + cluster_size) != off) { 431 res->bfi.fragmented_clusters++; 432 } 433 prev_off = off; 434 } 435 436 if (flush_bat) { 437 ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size); 438 if (ret < 0) { 439 res->check_errors++; 440 return ret; 441 } 442 } 443 444 res->image_end_offset = high_off + cluster_size; 445 if (size > res->image_end_offset) { 446 int64_t count; 447 count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size); 448 fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n", 449 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR", 450 size - res->image_end_offset); 451 res->leaks += count; 452 if (fix & BDRV_FIX_LEAKS) { 453 Error *local_err = NULL; 454 ret = bdrv_truncate(bs->file, res->image_end_offset, 455 PREALLOC_MODE_OFF, &local_err); 456 if (ret < 0) { 457 error_report_err(local_err); 458 res->check_errors++; 459 return ret; 460 } 461 res->leaks_fixed += count; 462 } 463 } 464 465 return 0; 466 } 467 468 469 static int parallels_create(const char *filename, QemuOpts *opts, Error **errp) 470 { 471 int64_t total_size, cl_size; 472 uint8_t tmp[BDRV_SECTOR_SIZE]; 473 Error *local_err = NULL; 474 BlockBackend *file; 475 uint32_t bat_entries, bat_sectors; 476 ParallelsHeader header; 477 int ret; 478 479 total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), 480 BDRV_SECTOR_SIZE); 481 cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE, 482 DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE); 483 if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) { 484 error_propagate(errp, local_err); 485 return -E2BIG; 486 } 487 488 ret = bdrv_create_file(filename, opts, &local_err); 489 if (ret < 0) { 490 error_propagate(errp, local_err); 491 return ret; 492 } 493 494 file = blk_new_open(filename, NULL, NULL, 495 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, 496 &local_err); 497 if (file == NULL) { 498 error_propagate(errp, local_err); 499 return -EIO; 500 } 501 502 blk_set_allow_write_beyond_eof(file, true); 503 504 ret = blk_truncate(file, 0, PREALLOC_MODE_OFF, errp); 505 if (ret < 0) { 506 goto exit; 507 } 508 509 bat_entries = DIV_ROUND_UP(total_size, cl_size); 510 bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size); 511 bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS; 512 513 memset(&header, 0, sizeof(header)); 514 memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic)); 515 header.version = cpu_to_le32(HEADER_VERSION); 516 /* don't care much about geometry, it is not used on image level */ 517 header.heads = cpu_to_le32(HEADS_NUMBER); 518 header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE 519 / HEADS_NUMBER / SEC_IN_CYL); 520 header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS); 521 header.bat_entries = cpu_to_le32(bat_entries); 522 header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE)); 523 header.data_off = cpu_to_le32(bat_sectors); 524 525 /* write all the data */ 526 memset(tmp, 0, sizeof(tmp)); 527 memcpy(tmp, &header, sizeof(header)); 528 529 ret = blk_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE, 0); 530 if (ret < 0) { 531 goto exit; 532 } 533 ret = blk_pwrite_zeroes(file, BDRV_SECTOR_SIZE, 534 (bat_sectors - 1) << BDRV_SECTOR_BITS, 0); 535 if (ret < 0) { 536 goto exit; 537 } 538 ret = 0; 539 540 done: 541 blk_unref(file); 542 return ret; 543 544 exit: 545 error_setg_errno(errp, -ret, "Failed to create Parallels image"); 546 goto done; 547 } 548 549 550 static int parallels_probe(const uint8_t *buf, int buf_size, 551 const char *filename) 552 { 553 const ParallelsHeader *ph = (const void *)buf; 554 555 if (buf_size < sizeof(ParallelsHeader)) { 556 return 0; 557 } 558 559 if ((!memcmp(ph->magic, HEADER_MAGIC, 16) || 560 !memcmp(ph->magic, HEADER_MAGIC2, 16)) && 561 (le32_to_cpu(ph->version) == HEADER_VERSION)) { 562 return 100; 563 } 564 565 return 0; 566 } 567 568 static int parallels_update_header(BlockDriverState *bs) 569 { 570 BDRVParallelsState *s = bs->opaque; 571 unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs), 572 sizeof(ParallelsHeader)); 573 574 if (size > s->header_size) { 575 size = s->header_size; 576 } 577 return bdrv_pwrite_sync(bs->file, 0, s->header, size); 578 } 579 580 static int parallels_open(BlockDriverState *bs, QDict *options, int flags, 581 Error **errp) 582 { 583 BDRVParallelsState *s = bs->opaque; 584 ParallelsHeader ph; 585 int ret, size, i; 586 QemuOpts *opts = NULL; 587 Error *local_err = NULL; 588 char *buf; 589 590 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 591 false, errp); 592 if (!bs->file) { 593 return -EINVAL; 594 } 595 596 ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph)); 597 if (ret < 0) { 598 goto fail; 599 } 600 601 bs->total_sectors = le64_to_cpu(ph.nb_sectors); 602 603 if (le32_to_cpu(ph.version) != HEADER_VERSION) { 604 goto fail_format; 605 } 606 if (!memcmp(ph.magic, HEADER_MAGIC, 16)) { 607 s->off_multiplier = 1; 608 bs->total_sectors = 0xffffffff & bs->total_sectors; 609 } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) { 610 s->off_multiplier = le32_to_cpu(ph.tracks); 611 } else { 612 goto fail_format; 613 } 614 615 s->tracks = le32_to_cpu(ph.tracks); 616 if (s->tracks == 0) { 617 error_setg(errp, "Invalid image: Zero sectors per track"); 618 ret = -EINVAL; 619 goto fail; 620 } 621 if (s->tracks > INT32_MAX/513) { 622 error_setg(errp, "Invalid image: Too big cluster"); 623 ret = -EFBIG; 624 goto fail; 625 } 626 627 s->bat_size = le32_to_cpu(ph.bat_entries); 628 if (s->bat_size > INT_MAX / sizeof(uint32_t)) { 629 error_setg(errp, "Catalog too large"); 630 ret = -EFBIG; 631 goto fail; 632 } 633 634 size = bat_entry_off(s->bat_size); 635 s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs)); 636 s->header = qemu_try_blockalign(bs->file->bs, s->header_size); 637 if (s->header == NULL) { 638 ret = -ENOMEM; 639 goto fail; 640 } 641 s->data_end = le32_to_cpu(ph.data_off); 642 if (s->data_end == 0) { 643 s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE); 644 } 645 if (s->data_end < s->header_size) { 646 /* there is not enough unused space to fit to block align between BAT 647 and actual data. We can't avoid read-modify-write... */ 648 s->header_size = size; 649 } 650 651 ret = bdrv_pread(bs->file, 0, s->header, s->header_size); 652 if (ret < 0) { 653 goto fail; 654 } 655 s->bat_bitmap = (uint32_t *)(s->header + 1); 656 657 for (i = 0; i < s->bat_size; i++) { 658 int64_t off = bat2sect(s, i); 659 if (off >= s->data_end) { 660 s->data_end = off + s->tracks; 661 } 662 } 663 664 if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) { 665 /* Image was not closed correctly. The check is mandatory */ 666 s->header_unclean = true; 667 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { 668 error_setg(errp, "parallels: Image was not closed correctly; " 669 "cannot be opened read/write"); 670 ret = -EACCES; 671 goto fail; 672 } 673 } 674 675 opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, &local_err); 676 if (local_err != NULL) { 677 goto fail_options; 678 } 679 680 qemu_opts_absorb_qdict(opts, options, &local_err); 681 if (local_err != NULL) { 682 goto fail_options; 683 } 684 685 s->prealloc_size = 686 qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0); 687 s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS); 688 buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE); 689 s->prealloc_mode = qapi_enum_parse(&prealloc_mode_lookup, buf, 690 PRL_PREALLOC_MODE_FALLOCATE, 691 &local_err); 692 g_free(buf); 693 if (local_err != NULL) { 694 goto fail_options; 695 } 696 697 if (!bdrv_has_zero_init(bs->file->bs)) { 698 s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE; 699 } 700 701 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_INACTIVE)) { 702 s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC); 703 ret = parallels_update_header(bs); 704 if (ret < 0) { 705 goto fail; 706 } 707 } 708 709 s->bat_dirty_block = 4 * getpagesize(); 710 s->bat_dirty_bmap = 711 bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block)); 712 713 /* Disable migration until bdrv_invalidate_cache method is added */ 714 error_setg(&s->migration_blocker, "The Parallels format used by node '%s' " 715 "does not support live migration", 716 bdrv_get_device_or_node_name(bs)); 717 ret = migrate_add_blocker(s->migration_blocker, &local_err); 718 if (local_err) { 719 error_propagate(errp, local_err); 720 error_free(s->migration_blocker); 721 goto fail; 722 } 723 qemu_co_mutex_init(&s->lock); 724 return 0; 725 726 fail_format: 727 error_setg(errp, "Image not in Parallels format"); 728 ret = -EINVAL; 729 fail: 730 qemu_vfree(s->header); 731 return ret; 732 733 fail_options: 734 error_propagate(errp, local_err); 735 ret = -EINVAL; 736 goto fail; 737 } 738 739 740 static void parallels_close(BlockDriverState *bs) 741 { 742 BDRVParallelsState *s = bs->opaque; 743 744 if ((bs->open_flags & BDRV_O_RDWR) && !(bs->open_flags & BDRV_O_INACTIVE)) { 745 s->header->inuse = 0; 746 parallels_update_header(bs); 747 bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS, 748 PREALLOC_MODE_OFF, NULL); 749 } 750 751 g_free(s->bat_dirty_bmap); 752 qemu_vfree(s->header); 753 754 migrate_del_blocker(s->migration_blocker); 755 error_free(s->migration_blocker); 756 } 757 758 static QemuOptsList parallels_create_opts = { 759 .name = "parallels-create-opts", 760 .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head), 761 .desc = { 762 { 763 .name = BLOCK_OPT_SIZE, 764 .type = QEMU_OPT_SIZE, 765 .help = "Virtual disk size", 766 }, 767 { 768 .name = BLOCK_OPT_CLUSTER_SIZE, 769 .type = QEMU_OPT_SIZE, 770 .help = "Parallels image cluster size", 771 .def_value_str = stringify(DEFAULT_CLUSTER_SIZE), 772 }, 773 { /* end of list */ } 774 } 775 }; 776 777 static BlockDriver bdrv_parallels = { 778 .format_name = "parallels", 779 .instance_size = sizeof(BDRVParallelsState), 780 .bdrv_probe = parallels_probe, 781 .bdrv_open = parallels_open, 782 .bdrv_close = parallels_close, 783 .bdrv_child_perm = bdrv_format_default_perms, 784 .bdrv_co_get_block_status = parallels_co_get_block_status, 785 .bdrv_has_zero_init = bdrv_has_zero_init_1, 786 .bdrv_co_flush_to_os = parallels_co_flush_to_os, 787 .bdrv_co_readv = parallels_co_readv, 788 .bdrv_co_writev = parallels_co_writev, 789 .supports_backing = true, 790 .bdrv_create = parallels_create, 791 .bdrv_check = parallels_check, 792 .create_opts = ¶llels_create_opts, 793 }; 794 795 static void bdrv_parallels_init(void) 796 { 797 bdrv_register(&bdrv_parallels); 798 } 799 800 block_init(bdrv_parallels_init); 801