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 "block/qdict.h" 35 #include "sysemu/block-backend.h" 36 #include "qemu/module.h" 37 #include "qemu/option.h" 38 #include "qapi/qmp/qdict.h" 39 #include "qapi/qobject-input-visitor.h" 40 #include "qapi/qapi-visit-block-core.h" 41 #include "qemu/bswap.h" 42 #include "qemu/bitmap.h" 43 #include "migration/blocker.h" 44 #include "parallels.h" 45 46 /**************************************************************/ 47 48 #define HEADER_MAGIC "WithoutFreeSpace" 49 #define HEADER_MAGIC2 "WithouFreSpacExt" 50 #define HEADER_VERSION 2 51 #define HEADER_INUSE_MAGIC (0x746F6E59) 52 #define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32) 53 54 static QEnumLookup prealloc_mode_lookup = { 55 .array = (const char *const[]) { 56 "falloc", 57 "truncate", 58 }, 59 .size = PRL_PREALLOC_MODE__MAX 60 }; 61 62 #define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode" 63 #define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size" 64 65 static QemuOptsList parallels_runtime_opts = { 66 .name = "parallels", 67 .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head), 68 .desc = { 69 { 70 .name = PARALLELS_OPT_PREALLOC_SIZE, 71 .type = QEMU_OPT_SIZE, 72 .help = "Preallocation size on image expansion", 73 .def_value_str = "128M", 74 }, 75 { 76 .name = PARALLELS_OPT_PREALLOC_MODE, 77 .type = QEMU_OPT_STRING, 78 .help = "Preallocation mode on image expansion " 79 "(allowed values: falloc, truncate)", 80 .def_value_str = "falloc", 81 }, 82 { /* end of list */ }, 83 }, 84 }; 85 86 static QemuOptsList parallels_create_opts = { 87 .name = "parallels-create-opts", 88 .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head), 89 .desc = { 90 { 91 .name = BLOCK_OPT_SIZE, 92 .type = QEMU_OPT_SIZE, 93 .help = "Virtual disk size", 94 }, 95 { 96 .name = BLOCK_OPT_CLUSTER_SIZE, 97 .type = QEMU_OPT_SIZE, 98 .help = "Parallels image cluster size", 99 .def_value_str = stringify(DEFAULT_CLUSTER_SIZE), 100 }, 101 { /* end of list */ } 102 } 103 }; 104 105 106 static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx) 107 { 108 return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier; 109 } 110 111 static uint32_t bat_entry_off(uint32_t idx) 112 { 113 return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx; 114 } 115 116 static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num) 117 { 118 uint32_t index, offset; 119 120 index = sector_num / s->tracks; 121 offset = sector_num % s->tracks; 122 123 /* not allocated */ 124 if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) { 125 return -1; 126 } 127 return bat2sect(s, index) + offset; 128 } 129 130 static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num, 131 int nb_sectors) 132 { 133 int ret = s->tracks - sector_num % s->tracks; 134 return MIN(nb_sectors, ret); 135 } 136 137 static int64_t block_status(BDRVParallelsState *s, int64_t sector_num, 138 int nb_sectors, int *pnum) 139 { 140 int64_t start_off = -2, prev_end_off = -2; 141 142 *pnum = 0; 143 while (nb_sectors > 0 || start_off == -2) { 144 int64_t offset = seek_to_sector(s, sector_num); 145 int to_end; 146 147 if (start_off == -2) { 148 start_off = offset; 149 prev_end_off = offset; 150 } else if (offset != prev_end_off) { 151 break; 152 } 153 154 to_end = cluster_remainder(s, sector_num, nb_sectors); 155 nb_sectors -= to_end; 156 sector_num += to_end; 157 *pnum += to_end; 158 159 if (offset > 0) { 160 prev_end_off += to_end; 161 } 162 } 163 return start_off; 164 } 165 166 static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num, 167 int nb_sectors, int *pnum) 168 { 169 int ret = 0; 170 BDRVParallelsState *s = bs->opaque; 171 int64_t pos, space, idx, to_allocate, i, len; 172 173 pos = block_status(s, sector_num, nb_sectors, pnum); 174 if (pos > 0) { 175 return pos; 176 } 177 178 idx = sector_num / s->tracks; 179 to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx; 180 181 /* This function is called only by parallels_co_writev(), which will never 182 * pass a sector_num at or beyond the end of the image (because the block 183 * layer never passes such a sector_num to that function). Therefore, idx 184 * is always below s->bat_size. 185 * block_status() will limit *pnum so that sector_num + *pnum will not 186 * exceed the image end. Therefore, idx + to_allocate cannot exceed 187 * s->bat_size. 188 * Note that s->bat_size is an unsigned int, therefore idx + to_allocate 189 * will always fit into a uint32_t. */ 190 assert(idx < s->bat_size && idx + to_allocate <= s->bat_size); 191 192 space = to_allocate * s->tracks; 193 len = bdrv_getlength(bs->file->bs); 194 if (len < 0) { 195 return len; 196 } 197 if (s->data_end + space > (len >> BDRV_SECTOR_BITS)) { 198 space += s->prealloc_size; 199 /* 200 * We require the expanded size to read back as zero. If the 201 * user permitted truncation, we try that; but if it fails, we 202 * force the safer-but-slower fallocate. 203 */ 204 if (s->prealloc_mode == PRL_PREALLOC_MODE_TRUNCATE) { 205 ret = bdrv_truncate(bs->file, 206 (s->data_end + space) << BDRV_SECTOR_BITS, 207 false, PREALLOC_MODE_OFF, BDRV_REQ_ZERO_WRITE, 208 NULL); 209 if (ret == -ENOTSUP) { 210 s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE; 211 } 212 } 213 if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) { 214 ret = bdrv_pwrite_zeroes(bs->file, 215 s->data_end << BDRV_SECTOR_BITS, 216 space << BDRV_SECTOR_BITS, 0); 217 } 218 if (ret < 0) { 219 return ret; 220 } 221 } 222 223 /* Try to read from backing to fill empty clusters 224 * FIXME: 1. previous write_zeroes may be redundant 225 * 2. most of data we read from backing will be rewritten by 226 * parallels_co_writev. On aligned-to-cluster write we do not need 227 * this read at all. 228 * 3. it would be good to combine write of data from backing and new 229 * data into one write call */ 230 if (bs->backing) { 231 int64_t nb_cow_sectors = to_allocate * s->tracks; 232 int64_t nb_cow_bytes = nb_cow_sectors << BDRV_SECTOR_BITS; 233 void *buf = qemu_blockalign(bs, nb_cow_bytes); 234 235 ret = bdrv_co_pread(bs->backing, idx * s->tracks * BDRV_SECTOR_SIZE, 236 nb_cow_bytes, buf, 0); 237 if (ret < 0) { 238 qemu_vfree(buf); 239 return ret; 240 } 241 242 ret = bdrv_co_pwritev(bs->file, s->data_end * BDRV_SECTOR_SIZE, 243 nb_cow_bytes, buf, 0); 244 qemu_vfree(buf); 245 if (ret < 0) { 246 return ret; 247 } 248 } 249 250 for (i = 0; i < to_allocate; i++) { 251 s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier); 252 s->data_end += s->tracks; 253 bitmap_set(s->bat_dirty_bmap, 254 bat_entry_off(idx + i) / s->bat_dirty_block, 1); 255 } 256 257 return bat2sect(s, idx) + sector_num % s->tracks; 258 } 259 260 261 static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs) 262 { 263 BDRVParallelsState *s = bs->opaque; 264 unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block); 265 unsigned long bit; 266 267 qemu_co_mutex_lock(&s->lock); 268 269 bit = find_first_bit(s->bat_dirty_bmap, size); 270 while (bit < size) { 271 uint32_t off = bit * s->bat_dirty_block; 272 uint32_t to_write = s->bat_dirty_block; 273 int ret; 274 275 if (off + to_write > s->header_size) { 276 to_write = s->header_size - off; 277 } 278 ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off, 279 to_write); 280 if (ret < 0) { 281 qemu_co_mutex_unlock(&s->lock); 282 return ret; 283 } 284 bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1); 285 } 286 bitmap_zero(s->bat_dirty_bmap, size); 287 288 qemu_co_mutex_unlock(&s->lock); 289 return 0; 290 } 291 292 293 static int coroutine_fn parallels_co_block_status(BlockDriverState *bs, 294 bool want_zero, 295 int64_t offset, 296 int64_t bytes, 297 int64_t *pnum, 298 int64_t *map, 299 BlockDriverState **file) 300 { 301 BDRVParallelsState *s = bs->opaque; 302 int count; 303 304 assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE)); 305 qemu_co_mutex_lock(&s->lock); 306 offset = block_status(s, offset >> BDRV_SECTOR_BITS, 307 bytes >> BDRV_SECTOR_BITS, &count); 308 qemu_co_mutex_unlock(&s->lock); 309 310 *pnum = count * BDRV_SECTOR_SIZE; 311 if (offset < 0) { 312 return 0; 313 } 314 315 *map = offset * BDRV_SECTOR_SIZE; 316 *file = bs->file->bs; 317 return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 318 } 319 320 static coroutine_fn int parallels_co_writev(BlockDriverState *bs, 321 int64_t sector_num, int nb_sectors, 322 QEMUIOVector *qiov, int flags) 323 { 324 BDRVParallelsState *s = bs->opaque; 325 uint64_t bytes_done = 0; 326 QEMUIOVector hd_qiov; 327 int ret = 0; 328 329 assert(!flags); 330 qemu_iovec_init(&hd_qiov, qiov->niov); 331 332 while (nb_sectors > 0) { 333 int64_t position; 334 int n, nbytes; 335 336 qemu_co_mutex_lock(&s->lock); 337 position = allocate_clusters(bs, sector_num, nb_sectors, &n); 338 qemu_co_mutex_unlock(&s->lock); 339 if (position < 0) { 340 ret = (int)position; 341 break; 342 } 343 344 nbytes = n << BDRV_SECTOR_BITS; 345 346 qemu_iovec_reset(&hd_qiov); 347 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 348 349 ret = bdrv_co_pwritev(bs->file, position * BDRV_SECTOR_SIZE, nbytes, 350 &hd_qiov, 0); 351 if (ret < 0) { 352 break; 353 } 354 355 nb_sectors -= n; 356 sector_num += n; 357 bytes_done += nbytes; 358 } 359 360 qemu_iovec_destroy(&hd_qiov); 361 return ret; 362 } 363 364 static coroutine_fn int parallels_co_readv(BlockDriverState *bs, 365 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) 366 { 367 BDRVParallelsState *s = bs->opaque; 368 uint64_t bytes_done = 0; 369 QEMUIOVector hd_qiov; 370 int ret = 0; 371 372 qemu_iovec_init(&hd_qiov, qiov->niov); 373 374 while (nb_sectors > 0) { 375 int64_t position; 376 int n, nbytes; 377 378 qemu_co_mutex_lock(&s->lock); 379 position = block_status(s, sector_num, nb_sectors, &n); 380 qemu_co_mutex_unlock(&s->lock); 381 382 nbytes = n << BDRV_SECTOR_BITS; 383 384 qemu_iovec_reset(&hd_qiov); 385 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 386 387 if (position < 0) { 388 if (bs->backing) { 389 ret = bdrv_co_preadv(bs->backing, sector_num * BDRV_SECTOR_SIZE, 390 nbytes, &hd_qiov, 0); 391 if (ret < 0) { 392 break; 393 } 394 } else { 395 qemu_iovec_memset(&hd_qiov, 0, 0, nbytes); 396 } 397 } else { 398 ret = bdrv_co_preadv(bs->file, position * BDRV_SECTOR_SIZE, nbytes, 399 &hd_qiov, 0); 400 if (ret < 0) { 401 break; 402 } 403 } 404 405 nb_sectors -= n; 406 sector_num += n; 407 bytes_done += nbytes; 408 } 409 410 qemu_iovec_destroy(&hd_qiov); 411 return ret; 412 } 413 414 415 static int coroutine_fn parallels_co_check(BlockDriverState *bs, 416 BdrvCheckResult *res, 417 BdrvCheckMode fix) 418 { 419 BDRVParallelsState *s = bs->opaque; 420 int64_t size, prev_off, high_off; 421 int ret; 422 uint32_t i; 423 bool flush_bat = false; 424 int cluster_size = s->tracks << BDRV_SECTOR_BITS; 425 426 size = bdrv_getlength(bs->file->bs); 427 if (size < 0) { 428 res->check_errors++; 429 return size; 430 } 431 432 qemu_co_mutex_lock(&s->lock); 433 if (s->header_unclean) { 434 fprintf(stderr, "%s image was not closed correctly\n", 435 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR"); 436 res->corruptions++; 437 if (fix & BDRV_FIX_ERRORS) { 438 /* parallels_close will do the job right */ 439 res->corruptions_fixed++; 440 s->header_unclean = false; 441 } 442 } 443 444 res->bfi.total_clusters = s->bat_size; 445 res->bfi.compressed_clusters = 0; /* compression is not supported */ 446 447 high_off = 0; 448 prev_off = 0; 449 for (i = 0; i < s->bat_size; i++) { 450 int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS; 451 if (off == 0) { 452 prev_off = 0; 453 continue; 454 } 455 456 /* cluster outside the image */ 457 if (off > size) { 458 fprintf(stderr, "%s cluster %u is outside image\n", 459 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); 460 res->corruptions++; 461 if (fix & BDRV_FIX_ERRORS) { 462 prev_off = 0; 463 s->bat_bitmap[i] = 0; 464 res->corruptions_fixed++; 465 flush_bat = true; 466 continue; 467 } 468 } 469 470 res->bfi.allocated_clusters++; 471 if (off > high_off) { 472 high_off = off; 473 } 474 475 if (prev_off != 0 && (prev_off + cluster_size) != off) { 476 res->bfi.fragmented_clusters++; 477 } 478 prev_off = off; 479 } 480 481 ret = 0; 482 if (flush_bat) { 483 ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size); 484 if (ret < 0) { 485 res->check_errors++; 486 goto out; 487 } 488 } 489 490 res->image_end_offset = high_off + cluster_size; 491 if (size > res->image_end_offset) { 492 int64_t count; 493 count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size); 494 fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n", 495 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR", 496 size - res->image_end_offset); 497 res->leaks += count; 498 if (fix & BDRV_FIX_LEAKS) { 499 Error *local_err = NULL; 500 501 /* 502 * In order to really repair the image, we must shrink it. 503 * That means we have to pass exact=true. 504 */ 505 ret = bdrv_truncate(bs->file, res->image_end_offset, true, 506 PREALLOC_MODE_OFF, 0, &local_err); 507 if (ret < 0) { 508 error_report_err(local_err); 509 res->check_errors++; 510 goto out; 511 } 512 res->leaks_fixed += count; 513 } 514 } 515 516 out: 517 qemu_co_mutex_unlock(&s->lock); 518 return ret; 519 } 520 521 522 static int coroutine_fn parallels_co_create(BlockdevCreateOptions* opts, 523 Error **errp) 524 { 525 BlockdevCreateOptionsParallels *parallels_opts; 526 BlockDriverState *bs; 527 BlockBackend *blk; 528 int64_t total_size, cl_size; 529 uint32_t bat_entries, bat_sectors; 530 ParallelsHeader header; 531 uint8_t tmp[BDRV_SECTOR_SIZE]; 532 int ret; 533 534 assert(opts->driver == BLOCKDEV_DRIVER_PARALLELS); 535 parallels_opts = &opts->u.parallels; 536 537 /* Sanity checks */ 538 total_size = parallels_opts->size; 539 540 if (parallels_opts->has_cluster_size) { 541 cl_size = parallels_opts->cluster_size; 542 } else { 543 cl_size = DEFAULT_CLUSTER_SIZE; 544 } 545 546 /* XXX What is the real limit here? This is an insanely large maximum. */ 547 if (cl_size >= INT64_MAX / MAX_PARALLELS_IMAGE_FACTOR) { 548 error_setg(errp, "Cluster size is too large"); 549 return -EINVAL; 550 } 551 if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) { 552 error_setg(errp, "Image size is too large for this cluster size"); 553 return -E2BIG; 554 } 555 556 if (!QEMU_IS_ALIGNED(total_size, BDRV_SECTOR_SIZE)) { 557 error_setg(errp, "Image size must be a multiple of 512 bytes"); 558 return -EINVAL; 559 } 560 561 if (!QEMU_IS_ALIGNED(cl_size, BDRV_SECTOR_SIZE)) { 562 error_setg(errp, "Cluster size must be a multiple of 512 bytes"); 563 return -EINVAL; 564 } 565 566 /* Create BlockBackend to write to the image */ 567 bs = bdrv_open_blockdev_ref(parallels_opts->file, errp); 568 if (bs == NULL) { 569 return -EIO; 570 } 571 572 blk = blk_new_with_bs(bs, BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL, 573 errp); 574 if (!blk) { 575 ret = -EPERM; 576 goto out; 577 } 578 blk_set_allow_write_beyond_eof(blk, true); 579 580 /* Create image format */ 581 bat_entries = DIV_ROUND_UP(total_size, cl_size); 582 bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size); 583 bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS; 584 585 memset(&header, 0, sizeof(header)); 586 memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic)); 587 header.version = cpu_to_le32(HEADER_VERSION); 588 /* don't care much about geometry, it is not used on image level */ 589 header.heads = cpu_to_le32(HEADS_NUMBER); 590 header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE 591 / HEADS_NUMBER / SEC_IN_CYL); 592 header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS); 593 header.bat_entries = cpu_to_le32(bat_entries); 594 header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE)); 595 header.data_off = cpu_to_le32(bat_sectors); 596 597 /* write all the data */ 598 memset(tmp, 0, sizeof(tmp)); 599 memcpy(tmp, &header, sizeof(header)); 600 601 ret = blk_pwrite(blk, 0, tmp, BDRV_SECTOR_SIZE, 0); 602 if (ret < 0) { 603 goto exit; 604 } 605 ret = blk_pwrite_zeroes(blk, BDRV_SECTOR_SIZE, 606 (bat_sectors - 1) << BDRV_SECTOR_BITS, 0); 607 if (ret < 0) { 608 goto exit; 609 } 610 611 ret = 0; 612 out: 613 blk_unref(blk); 614 bdrv_unref(bs); 615 return ret; 616 617 exit: 618 error_setg_errno(errp, -ret, "Failed to create Parallels image"); 619 goto out; 620 } 621 622 static int coroutine_fn parallels_co_create_opts(BlockDriver *drv, 623 const char *filename, 624 QemuOpts *opts, 625 Error **errp) 626 { 627 BlockdevCreateOptions *create_options = NULL; 628 BlockDriverState *bs = NULL; 629 QDict *qdict; 630 Visitor *v; 631 int ret; 632 633 static const QDictRenames opt_renames[] = { 634 { BLOCK_OPT_CLUSTER_SIZE, "cluster-size" }, 635 { NULL, NULL }, 636 }; 637 638 /* Parse options and convert legacy syntax */ 639 qdict = qemu_opts_to_qdict_filtered(opts, NULL, ¶llels_create_opts, 640 true); 641 642 if (!qdict_rename_keys(qdict, opt_renames, errp)) { 643 ret = -EINVAL; 644 goto done; 645 } 646 647 /* Create and open the file (protocol layer) */ 648 ret = bdrv_create_file(filename, opts, errp); 649 if (ret < 0) { 650 goto done; 651 } 652 653 bs = bdrv_open(filename, NULL, NULL, 654 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); 655 if (bs == NULL) { 656 ret = -EIO; 657 goto done; 658 } 659 660 /* Now get the QAPI type BlockdevCreateOptions */ 661 qdict_put_str(qdict, "driver", "parallels"); 662 qdict_put_str(qdict, "file", bs->node_name); 663 664 v = qobject_input_visitor_new_flat_confused(qdict, errp); 665 if (!v) { 666 ret = -EINVAL; 667 goto done; 668 } 669 670 visit_type_BlockdevCreateOptions(v, NULL, &create_options, errp); 671 visit_free(v); 672 if (!create_options) { 673 ret = -EINVAL; 674 goto done; 675 } 676 677 /* Silently round up sizes */ 678 create_options->u.parallels.size = 679 ROUND_UP(create_options->u.parallels.size, BDRV_SECTOR_SIZE); 680 create_options->u.parallels.cluster_size = 681 ROUND_UP(create_options->u.parallels.cluster_size, BDRV_SECTOR_SIZE); 682 683 /* Create the Parallels image (format layer) */ 684 ret = parallels_co_create(create_options, errp); 685 if (ret < 0) { 686 goto done; 687 } 688 ret = 0; 689 690 done: 691 qobject_unref(qdict); 692 bdrv_unref(bs); 693 qapi_free_BlockdevCreateOptions(create_options); 694 return ret; 695 } 696 697 698 static int parallels_probe(const uint8_t *buf, int buf_size, 699 const char *filename) 700 { 701 const ParallelsHeader *ph = (const void *)buf; 702 703 if (buf_size < sizeof(ParallelsHeader)) { 704 return 0; 705 } 706 707 if ((!memcmp(ph->magic, HEADER_MAGIC, 16) || 708 !memcmp(ph->magic, HEADER_MAGIC2, 16)) && 709 (le32_to_cpu(ph->version) == HEADER_VERSION)) { 710 return 100; 711 } 712 713 return 0; 714 } 715 716 static int parallels_update_header(BlockDriverState *bs) 717 { 718 BDRVParallelsState *s = bs->opaque; 719 unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs), 720 sizeof(ParallelsHeader)); 721 722 if (size > s->header_size) { 723 size = s->header_size; 724 } 725 return bdrv_pwrite_sync(bs->file, 0, s->header, size); 726 } 727 728 static int parallels_open(BlockDriverState *bs, QDict *options, int flags, 729 Error **errp) 730 { 731 BDRVParallelsState *s = bs->opaque; 732 ParallelsHeader ph; 733 int ret, size, i; 734 QemuOpts *opts = NULL; 735 Error *local_err = NULL; 736 char *buf; 737 738 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds, 739 BDRV_CHILD_IMAGE, false, errp); 740 if (!bs->file) { 741 return -EINVAL; 742 } 743 744 ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph)); 745 if (ret < 0) { 746 goto fail; 747 } 748 749 bs->total_sectors = le64_to_cpu(ph.nb_sectors); 750 751 if (le32_to_cpu(ph.version) != HEADER_VERSION) { 752 goto fail_format; 753 } 754 if (!memcmp(ph.magic, HEADER_MAGIC, 16)) { 755 s->off_multiplier = 1; 756 bs->total_sectors = 0xffffffff & bs->total_sectors; 757 } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) { 758 s->off_multiplier = le32_to_cpu(ph.tracks); 759 } else { 760 goto fail_format; 761 } 762 763 s->tracks = le32_to_cpu(ph.tracks); 764 if (s->tracks == 0) { 765 error_setg(errp, "Invalid image: Zero sectors per track"); 766 ret = -EINVAL; 767 goto fail; 768 } 769 if (s->tracks > INT32_MAX/513) { 770 error_setg(errp, "Invalid image: Too big cluster"); 771 ret = -EFBIG; 772 goto fail; 773 } 774 775 s->bat_size = le32_to_cpu(ph.bat_entries); 776 if (s->bat_size > INT_MAX / sizeof(uint32_t)) { 777 error_setg(errp, "Catalog too large"); 778 ret = -EFBIG; 779 goto fail; 780 } 781 782 size = bat_entry_off(s->bat_size); 783 s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs)); 784 s->header = qemu_try_blockalign(bs->file->bs, s->header_size); 785 if (s->header == NULL) { 786 ret = -ENOMEM; 787 goto fail; 788 } 789 s->data_end = le32_to_cpu(ph.data_off); 790 if (s->data_end == 0) { 791 s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE); 792 } 793 if (s->data_end < s->header_size) { 794 /* there is not enough unused space to fit to block align between BAT 795 and actual data. We can't avoid read-modify-write... */ 796 s->header_size = size; 797 } 798 799 ret = bdrv_pread(bs->file, 0, s->header, s->header_size); 800 if (ret < 0) { 801 goto fail; 802 } 803 s->bat_bitmap = (uint32_t *)(s->header + 1); 804 805 for (i = 0; i < s->bat_size; i++) { 806 int64_t off = bat2sect(s, i); 807 if (off >= s->data_end) { 808 s->data_end = off + s->tracks; 809 } 810 } 811 812 if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) { 813 /* Image was not closed correctly. The check is mandatory */ 814 s->header_unclean = true; 815 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { 816 error_setg(errp, "parallels: Image was not closed correctly; " 817 "cannot be opened read/write"); 818 ret = -EACCES; 819 goto fail; 820 } 821 } 822 823 opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, errp); 824 if (!opts) { 825 goto fail_options; 826 } 827 828 if (!qemu_opts_absorb_qdict(opts, options, errp)) { 829 goto fail_options; 830 } 831 832 s->prealloc_size = 833 qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0); 834 s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS); 835 buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE); 836 /* prealloc_mode can be downgraded later during allocate_clusters */ 837 s->prealloc_mode = qapi_enum_parse(&prealloc_mode_lookup, buf, 838 PRL_PREALLOC_MODE_FALLOCATE, 839 &local_err); 840 g_free(buf); 841 if (local_err != NULL) { 842 error_propagate(errp, local_err); 843 goto fail_options; 844 } 845 846 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_INACTIVE)) { 847 s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC); 848 ret = parallels_update_header(bs); 849 if (ret < 0) { 850 goto fail; 851 } 852 } 853 854 s->bat_dirty_block = 4 * qemu_real_host_page_size; 855 s->bat_dirty_bmap = 856 bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block)); 857 858 /* Disable migration until bdrv_invalidate_cache method is added */ 859 error_setg(&s->migration_blocker, "The Parallels format used by node '%s' " 860 "does not support live migration", 861 bdrv_get_device_or_node_name(bs)); 862 ret = migrate_add_blocker(s->migration_blocker, errp); 863 if (ret < 0) { 864 error_free(s->migration_blocker); 865 goto fail; 866 } 867 qemu_co_mutex_init(&s->lock); 868 return 0; 869 870 fail_format: 871 error_setg(errp, "Image not in Parallels format"); 872 fail_options: 873 ret = -EINVAL; 874 fail: 875 qemu_vfree(s->header); 876 return ret; 877 } 878 879 880 static void parallels_close(BlockDriverState *bs) 881 { 882 BDRVParallelsState *s = bs->opaque; 883 884 if ((bs->open_flags & BDRV_O_RDWR) && !(bs->open_flags & BDRV_O_INACTIVE)) { 885 s->header->inuse = 0; 886 parallels_update_header(bs); 887 888 /* errors are ignored, so we might as well pass exact=true */ 889 bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS, true, 890 PREALLOC_MODE_OFF, 0, NULL); 891 } 892 893 g_free(s->bat_dirty_bmap); 894 qemu_vfree(s->header); 895 896 migrate_del_blocker(s->migration_blocker); 897 error_free(s->migration_blocker); 898 } 899 900 static BlockDriver bdrv_parallels = { 901 .format_name = "parallels", 902 .instance_size = sizeof(BDRVParallelsState), 903 .bdrv_probe = parallels_probe, 904 .bdrv_open = parallels_open, 905 .bdrv_close = parallels_close, 906 .bdrv_child_perm = bdrv_default_perms, 907 .bdrv_co_block_status = parallels_co_block_status, 908 .bdrv_has_zero_init = bdrv_has_zero_init_1, 909 .bdrv_co_flush_to_os = parallels_co_flush_to_os, 910 .bdrv_co_readv = parallels_co_readv, 911 .bdrv_co_writev = parallels_co_writev, 912 .is_format = true, 913 .supports_backing = true, 914 .bdrv_co_create = parallels_co_create, 915 .bdrv_co_create_opts = parallels_co_create_opts, 916 .bdrv_co_check = parallels_co_check, 917 .create_opts = ¶llels_create_opts, 918 }; 919 920 static void bdrv_parallels_init(void) 921 { 922 bdrv_register(&bdrv_parallels); 923 } 924 925 block_init(bdrv_parallels_init); 926