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 "qemu/error-report.h" 33 #include "qapi/error.h" 34 #include "block/block_int.h" 35 #include "block/qdict.h" 36 #include "sysemu/block-backend.h" 37 #include "qemu/module.h" 38 #include "qemu/option.h" 39 #include "qapi/qmp/qdict.h" 40 #include "qapi/qobject-input-visitor.h" 41 #include "qapi/qapi-visit-block-core.h" 42 #include "qemu/bswap.h" 43 #include "qemu/bitmap.h" 44 #include "qemu/memalign.h" 45 #include "migration/blocker.h" 46 #include "parallels.h" 47 48 /**************************************************************/ 49 50 #define HEADER_MAGIC "WithoutFreeSpace" 51 #define HEADER_MAGIC2 "WithouFreSpacExt" 52 #define HEADER_VERSION 2 53 #define HEADER_INUSE_MAGIC (0x746F6E59) 54 #define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32) 55 56 static QEnumLookup prealloc_mode_lookup = { 57 .array = (const char *const[]) { 58 "falloc", 59 "truncate", 60 }, 61 .size = PRL_PREALLOC_MODE__MAX 62 }; 63 64 #define PARALLELS_OPT_PREALLOC_MODE "prealloc-mode" 65 #define PARALLELS_OPT_PREALLOC_SIZE "prealloc-size" 66 67 static QemuOptsList parallels_runtime_opts = { 68 .name = "parallels", 69 .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head), 70 .desc = { 71 { 72 .name = PARALLELS_OPT_PREALLOC_SIZE, 73 .type = QEMU_OPT_SIZE, 74 .help = "Preallocation size on image expansion", 75 .def_value_str = "128M", 76 }, 77 { 78 .name = PARALLELS_OPT_PREALLOC_MODE, 79 .type = QEMU_OPT_STRING, 80 .help = "Preallocation mode on image expansion " 81 "(allowed values: falloc, truncate)", 82 .def_value_str = "falloc", 83 }, 84 { /* end of list */ }, 85 }, 86 }; 87 88 static QemuOptsList parallels_create_opts = { 89 .name = "parallels-create-opts", 90 .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head), 91 .desc = { 92 { 93 .name = BLOCK_OPT_SIZE, 94 .type = QEMU_OPT_SIZE, 95 .help = "Virtual disk size", 96 }, 97 { 98 .name = BLOCK_OPT_CLUSTER_SIZE, 99 .type = QEMU_OPT_SIZE, 100 .help = "Parallels image cluster size", 101 .def_value_str = stringify(DEFAULT_CLUSTER_SIZE), 102 }, 103 { /* end of list */ } 104 } 105 }; 106 107 108 static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx) 109 { 110 return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier; 111 } 112 113 static uint32_t bat_entry_off(uint32_t idx) 114 { 115 return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx; 116 } 117 118 static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num) 119 { 120 uint32_t index, offset; 121 122 index = sector_num / s->tracks; 123 offset = sector_num % s->tracks; 124 125 /* not allocated */ 126 if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) { 127 return -1; 128 } 129 return bat2sect(s, index) + offset; 130 } 131 132 static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num, 133 int nb_sectors) 134 { 135 int ret = s->tracks - sector_num % s->tracks; 136 return MIN(nb_sectors, ret); 137 } 138 139 static int64_t block_status(BDRVParallelsState *s, int64_t sector_num, 140 int nb_sectors, int *pnum) 141 { 142 int64_t start_off = -2, prev_end_off = -2; 143 144 *pnum = 0; 145 while (nb_sectors > 0 || start_off == -2) { 146 int64_t offset = seek_to_sector(s, sector_num); 147 int to_end; 148 149 if (start_off == -2) { 150 start_off = offset; 151 prev_end_off = offset; 152 } else if (offset != prev_end_off) { 153 break; 154 } 155 156 to_end = cluster_remainder(s, sector_num, nb_sectors); 157 nb_sectors -= to_end; 158 sector_num += to_end; 159 *pnum += to_end; 160 161 if (offset > 0) { 162 prev_end_off += to_end; 163 } 164 } 165 return start_off; 166 } 167 168 static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num, 169 int nb_sectors, int *pnum) 170 { 171 int ret = 0; 172 BDRVParallelsState *s = bs->opaque; 173 int64_t pos, space, idx, to_allocate, i, len; 174 175 pos = block_status(s, sector_num, nb_sectors, pnum); 176 if (pos > 0) { 177 return pos; 178 } 179 180 idx = sector_num / s->tracks; 181 to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx; 182 183 /* This function is called only by parallels_co_writev(), which will never 184 * pass a sector_num at or beyond the end of the image (because the block 185 * layer never passes such a sector_num to that function). Therefore, idx 186 * is always below s->bat_size. 187 * block_status() will limit *pnum so that sector_num + *pnum will not 188 * exceed the image end. Therefore, idx + to_allocate cannot exceed 189 * s->bat_size. 190 * Note that s->bat_size is an unsigned int, therefore idx + to_allocate 191 * will always fit into a uint32_t. */ 192 assert(idx < s->bat_size && idx + to_allocate <= s->bat_size); 193 194 space = to_allocate * s->tracks; 195 len = bdrv_getlength(bs->file->bs); 196 if (len < 0) { 197 return len; 198 } 199 if (s->data_end + space > (len >> BDRV_SECTOR_BITS)) { 200 space += s->prealloc_size; 201 /* 202 * We require the expanded size to read back as zero. If the 203 * user permitted truncation, we try that; but if it fails, we 204 * force the safer-but-slower fallocate. 205 */ 206 if (s->prealloc_mode == PRL_PREALLOC_MODE_TRUNCATE) { 207 ret = bdrv_truncate(bs->file, 208 (s->data_end + space) << BDRV_SECTOR_BITS, 209 false, PREALLOC_MODE_OFF, BDRV_REQ_ZERO_WRITE, 210 NULL); 211 if (ret == -ENOTSUP) { 212 s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE; 213 } 214 } 215 if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) { 216 ret = bdrv_pwrite_zeroes(bs->file, 217 s->data_end << BDRV_SECTOR_BITS, 218 space << BDRV_SECTOR_BITS, 0); 219 } 220 if (ret < 0) { 221 return ret; 222 } 223 } 224 225 /* Try to read from backing to fill empty clusters 226 * FIXME: 1. previous write_zeroes may be redundant 227 * 2. most of data we read from backing will be rewritten by 228 * parallels_co_writev. On aligned-to-cluster write we do not need 229 * this read at all. 230 * 3. it would be good to combine write of data from backing and new 231 * data into one write call */ 232 if (bs->backing) { 233 int64_t nb_cow_sectors = to_allocate * s->tracks; 234 int64_t nb_cow_bytes = nb_cow_sectors << BDRV_SECTOR_BITS; 235 void *buf = qemu_blockalign(bs, nb_cow_bytes); 236 237 ret = bdrv_co_pread(bs->backing, idx * s->tracks * BDRV_SECTOR_SIZE, 238 nb_cow_bytes, buf, 0); 239 if (ret < 0) { 240 qemu_vfree(buf); 241 return ret; 242 } 243 244 ret = bdrv_co_pwritev(bs->file, s->data_end * BDRV_SECTOR_SIZE, 245 nb_cow_bytes, buf, 0); 246 qemu_vfree(buf); 247 if (ret < 0) { 248 return ret; 249 } 250 } 251 252 for (i = 0; i < to_allocate; i++) { 253 s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier); 254 s->data_end += s->tracks; 255 bitmap_set(s->bat_dirty_bmap, 256 bat_entry_off(idx + i) / s->bat_dirty_block, 1); 257 } 258 259 return bat2sect(s, idx) + sector_num % s->tracks; 260 } 261 262 263 static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs) 264 { 265 BDRVParallelsState *s = bs->opaque; 266 unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block); 267 unsigned long bit; 268 269 qemu_co_mutex_lock(&s->lock); 270 271 bit = find_first_bit(s->bat_dirty_bmap, size); 272 while (bit < size) { 273 uint32_t off = bit * s->bat_dirty_block; 274 uint32_t to_write = s->bat_dirty_block; 275 int ret; 276 277 if (off + to_write > s->header_size) { 278 to_write = s->header_size - off; 279 } 280 ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off, 281 to_write); 282 if (ret < 0) { 283 qemu_co_mutex_unlock(&s->lock); 284 return ret; 285 } 286 bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1); 287 } 288 bitmap_zero(s->bat_dirty_bmap, size); 289 290 qemu_co_mutex_unlock(&s->lock); 291 return 0; 292 } 293 294 295 static int coroutine_fn parallels_co_block_status(BlockDriverState *bs, 296 bool want_zero, 297 int64_t offset, 298 int64_t bytes, 299 int64_t *pnum, 300 int64_t *map, 301 BlockDriverState **file) 302 { 303 BDRVParallelsState *s = bs->opaque; 304 int count; 305 306 assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE)); 307 qemu_co_mutex_lock(&s->lock); 308 offset = block_status(s, offset >> BDRV_SECTOR_BITS, 309 bytes >> BDRV_SECTOR_BITS, &count); 310 qemu_co_mutex_unlock(&s->lock); 311 312 *pnum = count * BDRV_SECTOR_SIZE; 313 if (offset < 0) { 314 return 0; 315 } 316 317 *map = offset * BDRV_SECTOR_SIZE; 318 *file = bs->file->bs; 319 return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 320 } 321 322 static coroutine_fn int parallels_co_writev(BlockDriverState *bs, 323 int64_t sector_num, int nb_sectors, 324 QEMUIOVector *qiov, int flags) 325 { 326 BDRVParallelsState *s = bs->opaque; 327 uint64_t bytes_done = 0; 328 QEMUIOVector hd_qiov; 329 int ret = 0; 330 331 assert(!flags); 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 = allocate_clusters(bs, sector_num, nb_sectors, &n); 340 qemu_co_mutex_unlock(&s->lock); 341 if (position < 0) { 342 ret = (int)position; 343 break; 344 } 345 346 nbytes = n << BDRV_SECTOR_BITS; 347 348 qemu_iovec_reset(&hd_qiov); 349 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 350 351 ret = bdrv_co_pwritev(bs->file, position * BDRV_SECTOR_SIZE, nbytes, 352 &hd_qiov, 0); 353 if (ret < 0) { 354 break; 355 } 356 357 nb_sectors -= n; 358 sector_num += n; 359 bytes_done += nbytes; 360 } 361 362 qemu_iovec_destroy(&hd_qiov); 363 return ret; 364 } 365 366 static coroutine_fn int parallels_co_readv(BlockDriverState *bs, 367 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) 368 { 369 BDRVParallelsState *s = bs->opaque; 370 uint64_t bytes_done = 0; 371 QEMUIOVector hd_qiov; 372 int ret = 0; 373 374 qemu_iovec_init(&hd_qiov, qiov->niov); 375 376 while (nb_sectors > 0) { 377 int64_t position; 378 int n, nbytes; 379 380 qemu_co_mutex_lock(&s->lock); 381 position = block_status(s, sector_num, nb_sectors, &n); 382 qemu_co_mutex_unlock(&s->lock); 383 384 nbytes = n << BDRV_SECTOR_BITS; 385 386 qemu_iovec_reset(&hd_qiov); 387 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 388 389 if (position < 0) { 390 if (bs->backing) { 391 ret = bdrv_co_preadv(bs->backing, sector_num * BDRV_SECTOR_SIZE, 392 nbytes, &hd_qiov, 0); 393 if (ret < 0) { 394 break; 395 } 396 } else { 397 qemu_iovec_memset(&hd_qiov, 0, 0, nbytes); 398 } 399 } else { 400 ret = bdrv_co_preadv(bs->file, position * BDRV_SECTOR_SIZE, nbytes, 401 &hd_qiov, 0); 402 if (ret < 0) { 403 break; 404 } 405 } 406 407 nb_sectors -= n; 408 sector_num += n; 409 bytes_done += nbytes; 410 } 411 412 qemu_iovec_destroy(&hd_qiov); 413 return ret; 414 } 415 416 417 static int coroutine_fn parallels_co_check(BlockDriverState *bs, 418 BdrvCheckResult *res, 419 BdrvCheckMode fix) 420 { 421 BDRVParallelsState *s = bs->opaque; 422 int64_t size, prev_off, high_off; 423 int ret; 424 uint32_t i; 425 bool flush_bat = false; 426 427 size = bdrv_getlength(bs->file->bs); 428 if (size < 0) { 429 res->check_errors++; 430 return size; 431 } 432 433 qemu_co_mutex_lock(&s->lock); 434 if (s->header_unclean) { 435 fprintf(stderr, "%s image was not closed correctly\n", 436 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR"); 437 res->corruptions++; 438 if (fix & BDRV_FIX_ERRORS) { 439 /* parallels_close will do the job right */ 440 res->corruptions_fixed++; 441 s->header_unclean = false; 442 } 443 } 444 445 res->bfi.total_clusters = s->bat_size; 446 res->bfi.compressed_clusters = 0; /* compression is not supported */ 447 448 high_off = 0; 449 prev_off = 0; 450 for (i = 0; i < s->bat_size; i++) { 451 int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS; 452 if (off == 0) { 453 prev_off = 0; 454 continue; 455 } 456 457 /* cluster outside the image */ 458 if (off > size) { 459 fprintf(stderr, "%s cluster %u is outside image\n", 460 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); 461 res->corruptions++; 462 if (fix & BDRV_FIX_ERRORS) { 463 prev_off = 0; 464 s->bat_bitmap[i] = 0; 465 res->corruptions_fixed++; 466 flush_bat = true; 467 continue; 468 } 469 } 470 471 res->bfi.allocated_clusters++; 472 if (off > high_off) { 473 high_off = off; 474 } 475 476 if (prev_off != 0 && (prev_off + s->cluster_size) != off) { 477 res->bfi.fragmented_clusters++; 478 } 479 prev_off = off; 480 } 481 482 ret = 0; 483 if (flush_bat) { 484 ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size); 485 if (ret < 0) { 486 res->check_errors++; 487 goto out; 488 } 489 } 490 491 res->image_end_offset = high_off + s->cluster_size; 492 if (size > res->image_end_offset) { 493 int64_t count; 494 count = DIV_ROUND_UP(size - res->image_end_offset, s->cluster_size); 495 fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n", 496 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR", 497 size - res->image_end_offset); 498 res->leaks += count; 499 if (fix & BDRV_FIX_LEAKS) { 500 Error *local_err = NULL; 501 502 /* 503 * In order to really repair the image, we must shrink it. 504 * That means we have to pass exact=true. 505 */ 506 ret = bdrv_truncate(bs->file, res->image_end_offset, true, 507 PREALLOC_MODE_OFF, 0, &local_err); 508 if (ret < 0) { 509 error_report_err(local_err); 510 res->check_errors++; 511 goto out; 512 } 513 res->leaks_fixed += count; 514 } 515 } 516 517 out: 518 qemu_co_mutex_unlock(&s->lock); 519 return ret; 520 } 521 522 523 static int coroutine_fn parallels_co_create(BlockdevCreateOptions* opts, 524 Error **errp) 525 { 526 BlockdevCreateOptionsParallels *parallels_opts; 527 BlockDriverState *bs; 528 BlockBackend *blk; 529 int64_t total_size, cl_size; 530 uint32_t bat_entries, bat_sectors; 531 ParallelsHeader header; 532 uint8_t tmp[BDRV_SECTOR_SIZE]; 533 int ret; 534 535 assert(opts->driver == BLOCKDEV_DRIVER_PARALLELS); 536 parallels_opts = &opts->u.parallels; 537 538 /* Sanity checks */ 539 total_size = parallels_opts->size; 540 541 if (parallels_opts->has_cluster_size) { 542 cl_size = parallels_opts->cluster_size; 543 } else { 544 cl_size = DEFAULT_CLUSTER_SIZE; 545 } 546 547 /* XXX What is the real limit here? This is an insanely large maximum. */ 548 if (cl_size >= INT64_MAX / MAX_PARALLELS_IMAGE_FACTOR) { 549 error_setg(errp, "Cluster size is too large"); 550 return -EINVAL; 551 } 552 if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) { 553 error_setg(errp, "Image size is too large for this cluster size"); 554 return -E2BIG; 555 } 556 557 if (!QEMU_IS_ALIGNED(total_size, BDRV_SECTOR_SIZE)) { 558 error_setg(errp, "Image size must be a multiple of 512 bytes"); 559 return -EINVAL; 560 } 561 562 if (!QEMU_IS_ALIGNED(cl_size, BDRV_SECTOR_SIZE)) { 563 error_setg(errp, "Cluster size must be a multiple of 512 bytes"); 564 return -EINVAL; 565 } 566 567 /* Create BlockBackend to write to the image */ 568 bs = bdrv_open_blockdev_ref(parallels_opts->file, errp); 569 if (bs == NULL) { 570 return -EIO; 571 } 572 573 blk = blk_new_with_bs(bs, BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL, 574 errp); 575 if (!blk) { 576 ret = -EPERM; 577 goto out; 578 } 579 blk_set_allow_write_beyond_eof(blk, true); 580 581 /* Create image format */ 582 bat_entries = DIV_ROUND_UP(total_size, cl_size); 583 bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size); 584 bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS; 585 586 memset(&header, 0, sizeof(header)); 587 memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic)); 588 header.version = cpu_to_le32(HEADER_VERSION); 589 /* don't care much about geometry, it is not used on image level */ 590 header.heads = cpu_to_le32(HEADS_NUMBER); 591 header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE 592 / HEADS_NUMBER / SEC_IN_CYL); 593 header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS); 594 header.bat_entries = cpu_to_le32(bat_entries); 595 header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE)); 596 header.data_off = cpu_to_le32(bat_sectors); 597 598 /* write all the data */ 599 memset(tmp, 0, sizeof(tmp)); 600 memcpy(tmp, &header, sizeof(header)); 601 602 ret = blk_pwrite(blk, 0, tmp, BDRV_SECTOR_SIZE, 0); 603 if (ret < 0) { 604 goto exit; 605 } 606 ret = blk_pwrite_zeroes(blk, BDRV_SECTOR_SIZE, 607 (bat_sectors - 1) << BDRV_SECTOR_BITS, 0); 608 if (ret < 0) { 609 goto exit; 610 } 611 612 ret = 0; 613 out: 614 blk_unref(blk); 615 bdrv_unref(bs); 616 return ret; 617 618 exit: 619 error_setg_errno(errp, -ret, "Failed to create Parallels image"); 620 goto out; 621 } 622 623 static int coroutine_fn parallels_co_create_opts(BlockDriver *drv, 624 const char *filename, 625 QemuOpts *opts, 626 Error **errp) 627 { 628 BlockdevCreateOptions *create_options = NULL; 629 BlockDriverState *bs = NULL; 630 QDict *qdict; 631 Visitor *v; 632 int ret; 633 634 static const QDictRenames opt_renames[] = { 635 { BLOCK_OPT_CLUSTER_SIZE, "cluster-size" }, 636 { NULL, NULL }, 637 }; 638 639 /* Parse options and convert legacy syntax */ 640 qdict = qemu_opts_to_qdict_filtered(opts, NULL, ¶llels_create_opts, 641 true); 642 643 if (!qdict_rename_keys(qdict, opt_renames, errp)) { 644 ret = -EINVAL; 645 goto done; 646 } 647 648 /* Create and open the file (protocol layer) */ 649 ret = bdrv_create_file(filename, opts, errp); 650 if (ret < 0) { 651 goto done; 652 } 653 654 bs = bdrv_open(filename, NULL, NULL, 655 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); 656 if (bs == NULL) { 657 ret = -EIO; 658 goto done; 659 } 660 661 /* Now get the QAPI type BlockdevCreateOptions */ 662 qdict_put_str(qdict, "driver", "parallels"); 663 qdict_put_str(qdict, "file", bs->node_name); 664 665 v = qobject_input_visitor_new_flat_confused(qdict, errp); 666 if (!v) { 667 ret = -EINVAL; 668 goto done; 669 } 670 671 visit_type_BlockdevCreateOptions(v, NULL, &create_options, errp); 672 visit_free(v); 673 if (!create_options) { 674 ret = -EINVAL; 675 goto done; 676 } 677 678 /* Silently round up sizes */ 679 create_options->u.parallels.size = 680 ROUND_UP(create_options->u.parallels.size, BDRV_SECTOR_SIZE); 681 create_options->u.parallels.cluster_size = 682 ROUND_UP(create_options->u.parallels.cluster_size, BDRV_SECTOR_SIZE); 683 684 /* Create the Parallels image (format layer) */ 685 ret = parallels_co_create(create_options, errp); 686 if (ret < 0) { 687 goto done; 688 } 689 ret = 0; 690 691 done: 692 qobject_unref(qdict); 693 bdrv_unref(bs); 694 qapi_free_BlockdevCreateOptions(create_options); 695 return ret; 696 } 697 698 699 static int parallels_probe(const uint8_t *buf, int buf_size, 700 const char *filename) 701 { 702 const ParallelsHeader *ph = (const void *)buf; 703 704 if (buf_size < sizeof(ParallelsHeader)) { 705 return 0; 706 } 707 708 if ((!memcmp(ph->magic, HEADER_MAGIC, 16) || 709 !memcmp(ph->magic, HEADER_MAGIC2, 16)) && 710 (le32_to_cpu(ph->version) == HEADER_VERSION)) { 711 return 100; 712 } 713 714 return 0; 715 } 716 717 static int parallels_update_header(BlockDriverState *bs) 718 { 719 BDRVParallelsState *s = bs->opaque; 720 unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs), 721 sizeof(ParallelsHeader)); 722 723 if (size > s->header_size) { 724 size = s->header_size; 725 } 726 return bdrv_pwrite_sync(bs->file, 0, s->header, size); 727 } 728 729 static int parallels_open(BlockDriverState *bs, QDict *options, int flags, 730 Error **errp) 731 { 732 BDRVParallelsState *s = bs->opaque; 733 ParallelsHeader ph; 734 int ret, size, i; 735 QemuOpts *opts = NULL; 736 Error *local_err = NULL; 737 char *buf; 738 739 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds, 740 BDRV_CHILD_IMAGE, false, errp); 741 if (!bs->file) { 742 return -EINVAL; 743 } 744 745 ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph)); 746 if (ret < 0) { 747 goto fail; 748 } 749 750 bs->total_sectors = le64_to_cpu(ph.nb_sectors); 751 752 if (le32_to_cpu(ph.version) != HEADER_VERSION) { 753 goto fail_format; 754 } 755 if (!memcmp(ph.magic, HEADER_MAGIC, 16)) { 756 s->off_multiplier = 1; 757 bs->total_sectors = 0xffffffff & bs->total_sectors; 758 } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) { 759 s->off_multiplier = le32_to_cpu(ph.tracks); 760 } else { 761 goto fail_format; 762 } 763 764 s->tracks = le32_to_cpu(ph.tracks); 765 if (s->tracks == 0) { 766 error_setg(errp, "Invalid image: Zero sectors per track"); 767 ret = -EINVAL; 768 goto fail; 769 } 770 if (s->tracks > INT32_MAX/513) { 771 error_setg(errp, "Invalid image: Too big cluster"); 772 ret = -EFBIG; 773 goto fail; 774 } 775 s->cluster_size = s->tracks << BDRV_SECTOR_BITS; 776 777 s->bat_size = le32_to_cpu(ph.bat_entries); 778 if (s->bat_size > INT_MAX / sizeof(uint32_t)) { 779 error_setg(errp, "Catalog too large"); 780 ret = -EFBIG; 781 goto fail; 782 } 783 784 size = bat_entry_off(s->bat_size); 785 s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs)); 786 s->header = qemu_try_blockalign(bs->file->bs, s->header_size); 787 if (s->header == NULL) { 788 ret = -ENOMEM; 789 goto fail; 790 } 791 s->data_end = le32_to_cpu(ph.data_off); 792 if (s->data_end == 0) { 793 s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE); 794 } 795 if (s->data_end < s->header_size) { 796 /* there is not enough unused space to fit to block align between BAT 797 and actual data. We can't avoid read-modify-write... */ 798 s->header_size = size; 799 } 800 801 ret = bdrv_pread(bs->file, 0, s->header, s->header_size); 802 if (ret < 0) { 803 goto fail; 804 } 805 s->bat_bitmap = (uint32_t *)(s->header + 1); 806 807 for (i = 0; i < s->bat_size; i++) { 808 int64_t off = bat2sect(s, i); 809 if (off >= s->data_end) { 810 s->data_end = off + s->tracks; 811 } 812 } 813 814 if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) { 815 /* Image was not closed correctly. The check is mandatory */ 816 s->header_unclean = true; 817 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { 818 error_setg(errp, "parallels: Image was not closed correctly; " 819 "cannot be opened read/write"); 820 ret = -EACCES; 821 goto fail; 822 } 823 } 824 825 opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, errp); 826 if (!opts) { 827 goto fail_options; 828 } 829 830 if (!qemu_opts_absorb_qdict(opts, options, errp)) { 831 goto fail_options; 832 } 833 834 s->prealloc_size = 835 qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0); 836 s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS); 837 buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE); 838 /* prealloc_mode can be downgraded later during allocate_clusters */ 839 s->prealloc_mode = qapi_enum_parse(&prealloc_mode_lookup, buf, 840 PRL_PREALLOC_MODE_FALLOCATE, 841 &local_err); 842 g_free(buf); 843 if (local_err != NULL) { 844 error_propagate(errp, local_err); 845 goto fail_options; 846 } 847 848 if (ph.ext_off) { 849 if (flags & BDRV_O_RDWR) { 850 /* 851 * It's unsafe to open image RW if there is an extension (as we 852 * don't support it). But parallels driver in QEMU historically 853 * ignores the extension, so print warning and don't care. 854 */ 855 warn_report("Format Extension ignored in RW mode"); 856 } else { 857 ret = parallels_read_format_extension( 858 bs, le64_to_cpu(ph.ext_off) << BDRV_SECTOR_BITS, errp); 859 if (ret < 0) { 860 goto fail; 861 } 862 } 863 } 864 865 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_INACTIVE)) { 866 s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC); 867 ret = parallels_update_header(bs); 868 if (ret < 0) { 869 goto fail; 870 } 871 } 872 873 s->bat_dirty_block = 4 * qemu_real_host_page_size(); 874 s->bat_dirty_bmap = 875 bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block)); 876 877 /* Disable migration until bdrv_activate method is added */ 878 error_setg(&s->migration_blocker, "The Parallels format used by node '%s' " 879 "does not support live migration", 880 bdrv_get_device_or_node_name(bs)); 881 ret = migrate_add_blocker(s->migration_blocker, errp); 882 if (ret < 0) { 883 error_free(s->migration_blocker); 884 goto fail; 885 } 886 qemu_co_mutex_init(&s->lock); 887 return 0; 888 889 fail_format: 890 error_setg(errp, "Image not in Parallels format"); 891 fail_options: 892 ret = -EINVAL; 893 fail: 894 qemu_vfree(s->header); 895 return ret; 896 } 897 898 899 static void parallels_close(BlockDriverState *bs) 900 { 901 BDRVParallelsState *s = bs->opaque; 902 903 if ((bs->open_flags & BDRV_O_RDWR) && !(bs->open_flags & BDRV_O_INACTIVE)) { 904 s->header->inuse = 0; 905 parallels_update_header(bs); 906 907 /* errors are ignored, so we might as well pass exact=true */ 908 bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS, true, 909 PREALLOC_MODE_OFF, 0, NULL); 910 } 911 912 g_free(s->bat_dirty_bmap); 913 qemu_vfree(s->header); 914 915 migrate_del_blocker(s->migration_blocker); 916 error_free(s->migration_blocker); 917 } 918 919 static BlockDriver bdrv_parallels = { 920 .format_name = "parallels", 921 .instance_size = sizeof(BDRVParallelsState), 922 .bdrv_probe = parallels_probe, 923 .bdrv_open = parallels_open, 924 .bdrv_close = parallels_close, 925 .bdrv_child_perm = bdrv_default_perms, 926 .bdrv_co_block_status = parallels_co_block_status, 927 .bdrv_has_zero_init = bdrv_has_zero_init_1, 928 .bdrv_co_flush_to_os = parallels_co_flush_to_os, 929 .bdrv_co_readv = parallels_co_readv, 930 .bdrv_co_writev = parallels_co_writev, 931 .is_format = true, 932 .supports_backing = true, 933 .bdrv_co_create = parallels_co_create, 934 .bdrv_co_create_opts = parallels_co_create_opts, 935 .bdrv_co_check = parallels_co_check, 936 .create_opts = ¶llels_create_opts, 937 }; 938 939 static void bdrv_parallels_init(void) 940 { 941 bdrv_register(&bdrv_parallels); 942 } 943 944 block_init(bdrv_parallels_init); 945