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; 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 if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) { 200 ret = bdrv_pwrite_zeroes(bs->file, 201 s->data_end << BDRV_SECTOR_BITS, 202 space << BDRV_SECTOR_BITS, 0); 203 } else { 204 ret = bdrv_truncate(bs->file, 205 (s->data_end + space) << BDRV_SECTOR_BITS, 206 PREALLOC_MODE_OFF, NULL); 207 } 208 if (ret < 0) { 209 return ret; 210 } 211 } 212 213 /* Try to read from backing to fill empty clusters 214 * FIXME: 1. previous write_zeroes may be redundant 215 * 2. most of data we read from backing will be rewritten by 216 * parallels_co_writev. On aligned-to-cluster write we do not need 217 * this read at all. 218 * 3. it would be good to combine write of data from backing and new 219 * data into one write call */ 220 if (bs->backing) { 221 int64_t nb_cow_sectors = to_allocate * s->tracks; 222 int64_t nb_cow_bytes = nb_cow_sectors << BDRV_SECTOR_BITS; 223 QEMUIOVector qiov = 224 QEMU_IOVEC_INIT_BUF(qiov, qemu_blockalign(bs, nb_cow_bytes), 225 nb_cow_bytes); 226 227 ret = bdrv_co_preadv(bs->backing, idx * s->tracks * BDRV_SECTOR_SIZE, 228 nb_cow_bytes, &qiov, 0); 229 if (ret < 0) { 230 qemu_vfree(qemu_iovec_buf(&qiov)); 231 return ret; 232 } 233 234 ret = bdrv_co_pwritev(bs->file, s->data_end * BDRV_SECTOR_SIZE, 235 nb_cow_bytes, &qiov, 0); 236 qemu_vfree(qemu_iovec_buf(&qiov)); 237 if (ret < 0) { 238 return ret; 239 } 240 } 241 242 for (i = 0; i < to_allocate; i++) { 243 s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier); 244 s->data_end += s->tracks; 245 bitmap_set(s->bat_dirty_bmap, 246 bat_entry_off(idx + i) / s->bat_dirty_block, 1); 247 } 248 249 return bat2sect(s, idx) + sector_num % s->tracks; 250 } 251 252 253 static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs) 254 { 255 BDRVParallelsState *s = bs->opaque; 256 unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block); 257 unsigned long bit; 258 259 qemu_co_mutex_lock(&s->lock); 260 261 bit = find_first_bit(s->bat_dirty_bmap, size); 262 while (bit < size) { 263 uint32_t off = bit * s->bat_dirty_block; 264 uint32_t to_write = s->bat_dirty_block; 265 int ret; 266 267 if (off + to_write > s->header_size) { 268 to_write = s->header_size - off; 269 } 270 ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off, 271 to_write); 272 if (ret < 0) { 273 qemu_co_mutex_unlock(&s->lock); 274 return ret; 275 } 276 bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1); 277 } 278 bitmap_zero(s->bat_dirty_bmap, size); 279 280 qemu_co_mutex_unlock(&s->lock); 281 return 0; 282 } 283 284 285 static int coroutine_fn parallels_co_block_status(BlockDriverState *bs, 286 bool want_zero, 287 int64_t offset, 288 int64_t bytes, 289 int64_t *pnum, 290 int64_t *map, 291 BlockDriverState **file) 292 { 293 BDRVParallelsState *s = bs->opaque; 294 int count; 295 296 assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE)); 297 qemu_co_mutex_lock(&s->lock); 298 offset = block_status(s, offset >> BDRV_SECTOR_BITS, 299 bytes >> BDRV_SECTOR_BITS, &count); 300 qemu_co_mutex_unlock(&s->lock); 301 302 *pnum = count * BDRV_SECTOR_SIZE; 303 if (offset < 0) { 304 return 0; 305 } 306 307 *map = offset * BDRV_SECTOR_SIZE; 308 *file = bs->file->bs; 309 return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 310 } 311 312 static coroutine_fn int parallels_co_writev(BlockDriverState *bs, 313 int64_t sector_num, int nb_sectors, 314 QEMUIOVector *qiov, int flags) 315 { 316 BDRVParallelsState *s = bs->opaque; 317 uint64_t bytes_done = 0; 318 QEMUIOVector hd_qiov; 319 int ret = 0; 320 321 assert(!flags); 322 qemu_iovec_init(&hd_qiov, qiov->niov); 323 324 while (nb_sectors > 0) { 325 int64_t position; 326 int n, nbytes; 327 328 qemu_co_mutex_lock(&s->lock); 329 position = allocate_clusters(bs, sector_num, nb_sectors, &n); 330 qemu_co_mutex_unlock(&s->lock); 331 if (position < 0) { 332 ret = (int)position; 333 break; 334 } 335 336 nbytes = n << BDRV_SECTOR_BITS; 337 338 qemu_iovec_reset(&hd_qiov); 339 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 340 341 ret = bdrv_co_pwritev(bs->file, position * BDRV_SECTOR_SIZE, nbytes, 342 &hd_qiov, 0); 343 if (ret < 0) { 344 break; 345 } 346 347 nb_sectors -= n; 348 sector_num += n; 349 bytes_done += nbytes; 350 } 351 352 qemu_iovec_destroy(&hd_qiov); 353 return ret; 354 } 355 356 static coroutine_fn int parallels_co_readv(BlockDriverState *bs, 357 int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) 358 { 359 BDRVParallelsState *s = bs->opaque; 360 uint64_t bytes_done = 0; 361 QEMUIOVector hd_qiov; 362 int ret = 0; 363 364 qemu_iovec_init(&hd_qiov, qiov->niov); 365 366 while (nb_sectors > 0) { 367 int64_t position; 368 int n, nbytes; 369 370 qemu_co_mutex_lock(&s->lock); 371 position = block_status(s, sector_num, nb_sectors, &n); 372 qemu_co_mutex_unlock(&s->lock); 373 374 nbytes = n << BDRV_SECTOR_BITS; 375 376 qemu_iovec_reset(&hd_qiov); 377 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 378 379 if (position < 0) { 380 if (bs->backing) { 381 ret = bdrv_co_preadv(bs->backing, sector_num * BDRV_SECTOR_SIZE, 382 nbytes, &hd_qiov, 0); 383 if (ret < 0) { 384 break; 385 } 386 } else { 387 qemu_iovec_memset(&hd_qiov, 0, 0, nbytes); 388 } 389 } else { 390 ret = bdrv_co_preadv(bs->file, position * BDRV_SECTOR_SIZE, nbytes, 391 &hd_qiov, 0); 392 if (ret < 0) { 393 break; 394 } 395 } 396 397 nb_sectors -= n; 398 sector_num += n; 399 bytes_done += nbytes; 400 } 401 402 qemu_iovec_destroy(&hd_qiov); 403 return ret; 404 } 405 406 407 static int coroutine_fn parallels_co_check(BlockDriverState *bs, 408 BdrvCheckResult *res, 409 BdrvCheckMode fix) 410 { 411 BDRVParallelsState *s = bs->opaque; 412 int64_t size, prev_off, high_off; 413 int ret; 414 uint32_t i; 415 bool flush_bat = false; 416 int cluster_size = s->tracks << BDRV_SECTOR_BITS; 417 418 size = bdrv_getlength(bs->file->bs); 419 if (size < 0) { 420 res->check_errors++; 421 return size; 422 } 423 424 qemu_co_mutex_lock(&s->lock); 425 if (s->header_unclean) { 426 fprintf(stderr, "%s image was not closed correctly\n", 427 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR"); 428 res->corruptions++; 429 if (fix & BDRV_FIX_ERRORS) { 430 /* parallels_close will do the job right */ 431 res->corruptions_fixed++; 432 s->header_unclean = false; 433 } 434 } 435 436 res->bfi.total_clusters = s->bat_size; 437 res->bfi.compressed_clusters = 0; /* compression is not supported */ 438 439 high_off = 0; 440 prev_off = 0; 441 for (i = 0; i < s->bat_size; i++) { 442 int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS; 443 if (off == 0) { 444 prev_off = 0; 445 continue; 446 } 447 448 /* cluster outside the image */ 449 if (off > size) { 450 fprintf(stderr, "%s cluster %u is outside image\n", 451 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); 452 res->corruptions++; 453 if (fix & BDRV_FIX_ERRORS) { 454 prev_off = 0; 455 s->bat_bitmap[i] = 0; 456 res->corruptions_fixed++; 457 flush_bat = true; 458 continue; 459 } 460 } 461 462 res->bfi.allocated_clusters++; 463 if (off > high_off) { 464 high_off = off; 465 } 466 467 if (prev_off != 0 && (prev_off + cluster_size) != off) { 468 res->bfi.fragmented_clusters++; 469 } 470 prev_off = off; 471 } 472 473 ret = 0; 474 if (flush_bat) { 475 ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size); 476 if (ret < 0) { 477 res->check_errors++; 478 goto out; 479 } 480 } 481 482 res->image_end_offset = high_off + cluster_size; 483 if (size > res->image_end_offset) { 484 int64_t count; 485 count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size); 486 fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n", 487 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR", 488 size - res->image_end_offset); 489 res->leaks += count; 490 if (fix & BDRV_FIX_LEAKS) { 491 Error *local_err = NULL; 492 ret = bdrv_truncate(bs->file, res->image_end_offset, 493 PREALLOC_MODE_OFF, &local_err); 494 if (ret < 0) { 495 error_report_err(local_err); 496 res->check_errors++; 497 goto out; 498 } 499 res->leaks_fixed += count; 500 } 501 } 502 503 out: 504 qemu_co_mutex_unlock(&s->lock); 505 return ret; 506 } 507 508 509 static int coroutine_fn parallels_co_create(BlockdevCreateOptions* opts, 510 Error **errp) 511 { 512 BlockdevCreateOptionsParallels *parallels_opts; 513 BlockDriverState *bs; 514 BlockBackend *blk; 515 int64_t total_size, cl_size; 516 uint32_t bat_entries, bat_sectors; 517 ParallelsHeader header; 518 uint8_t tmp[BDRV_SECTOR_SIZE]; 519 int ret; 520 521 assert(opts->driver == BLOCKDEV_DRIVER_PARALLELS); 522 parallels_opts = &opts->u.parallels; 523 524 /* Sanity checks */ 525 total_size = parallels_opts->size; 526 527 if (parallels_opts->has_cluster_size) { 528 cl_size = parallels_opts->cluster_size; 529 } else { 530 cl_size = DEFAULT_CLUSTER_SIZE; 531 } 532 533 /* XXX What is the real limit here? This is an insanely large maximum. */ 534 if (cl_size >= INT64_MAX / MAX_PARALLELS_IMAGE_FACTOR) { 535 error_setg(errp, "Cluster size is too large"); 536 return -EINVAL; 537 } 538 if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) { 539 error_setg(errp, "Image size is too large for this cluster size"); 540 return -E2BIG; 541 } 542 543 if (!QEMU_IS_ALIGNED(total_size, BDRV_SECTOR_SIZE)) { 544 error_setg(errp, "Image size must be a multiple of 512 bytes"); 545 return -EINVAL; 546 } 547 548 if (!QEMU_IS_ALIGNED(cl_size, BDRV_SECTOR_SIZE)) { 549 error_setg(errp, "Cluster size must be a multiple of 512 bytes"); 550 return -EINVAL; 551 } 552 553 /* Create BlockBackend to write to the image */ 554 bs = bdrv_open_blockdev_ref(parallels_opts->file, errp); 555 if (bs == NULL) { 556 return -EIO; 557 } 558 559 blk = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL); 560 ret = blk_insert_bs(blk, bs, errp); 561 if (ret < 0) { 562 goto out; 563 } 564 blk_set_allow_write_beyond_eof(blk, true); 565 566 /* Create image format */ 567 ret = blk_truncate(blk, 0, PREALLOC_MODE_OFF, errp); 568 if (ret < 0) { 569 goto out; 570 } 571 572 bat_entries = DIV_ROUND_UP(total_size, cl_size); 573 bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size); 574 bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS; 575 576 memset(&header, 0, sizeof(header)); 577 memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic)); 578 header.version = cpu_to_le32(HEADER_VERSION); 579 /* don't care much about geometry, it is not used on image level */ 580 header.heads = cpu_to_le32(HEADS_NUMBER); 581 header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE 582 / HEADS_NUMBER / SEC_IN_CYL); 583 header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS); 584 header.bat_entries = cpu_to_le32(bat_entries); 585 header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE)); 586 header.data_off = cpu_to_le32(bat_sectors); 587 588 /* write all the data */ 589 memset(tmp, 0, sizeof(tmp)); 590 memcpy(tmp, &header, sizeof(header)); 591 592 ret = blk_pwrite(blk, 0, tmp, BDRV_SECTOR_SIZE, 0); 593 if (ret < 0) { 594 goto exit; 595 } 596 ret = blk_pwrite_zeroes(blk, BDRV_SECTOR_SIZE, 597 (bat_sectors - 1) << BDRV_SECTOR_BITS, 0); 598 if (ret < 0) { 599 goto exit; 600 } 601 602 ret = 0; 603 out: 604 blk_unref(blk); 605 bdrv_unref(bs); 606 return ret; 607 608 exit: 609 error_setg_errno(errp, -ret, "Failed to create Parallels image"); 610 goto out; 611 } 612 613 static int coroutine_fn parallels_co_create_opts(const char *filename, 614 QemuOpts *opts, 615 Error **errp) 616 { 617 BlockdevCreateOptions *create_options = NULL; 618 Error *local_err = NULL; 619 BlockDriverState *bs = NULL; 620 QDict *qdict; 621 Visitor *v; 622 int ret; 623 624 static const QDictRenames opt_renames[] = { 625 { BLOCK_OPT_CLUSTER_SIZE, "cluster-size" }, 626 { NULL, NULL }, 627 }; 628 629 /* Parse options and convert legacy syntax */ 630 qdict = qemu_opts_to_qdict_filtered(opts, NULL, ¶llels_create_opts, 631 true); 632 633 if (!qdict_rename_keys(qdict, opt_renames, errp)) { 634 ret = -EINVAL; 635 goto done; 636 } 637 638 /* Create and open the file (protocol layer) */ 639 ret = bdrv_create_file(filename, opts, &local_err); 640 if (ret < 0) { 641 error_propagate(errp, local_err); 642 goto done; 643 } 644 645 bs = bdrv_open(filename, NULL, NULL, 646 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); 647 if (bs == NULL) { 648 ret = -EIO; 649 goto done; 650 } 651 652 /* Now get the QAPI type BlockdevCreateOptions */ 653 qdict_put_str(qdict, "driver", "parallels"); 654 qdict_put_str(qdict, "file", bs->node_name); 655 656 v = qobject_input_visitor_new_flat_confused(qdict, errp); 657 if (!v) { 658 ret = -EINVAL; 659 goto done; 660 } 661 662 visit_type_BlockdevCreateOptions(v, NULL, &create_options, &local_err); 663 visit_free(v); 664 665 if (local_err) { 666 error_propagate(errp, local_err); 667 ret = -EINVAL; 668 goto done; 669 } 670 671 /* Silently round up sizes */ 672 create_options->u.parallels.size = 673 ROUND_UP(create_options->u.parallels.size, BDRV_SECTOR_SIZE); 674 create_options->u.parallels.cluster_size = 675 ROUND_UP(create_options->u.parallels.cluster_size, BDRV_SECTOR_SIZE); 676 677 /* Create the Parallels image (format layer) */ 678 ret = parallels_co_create(create_options, errp); 679 if (ret < 0) { 680 goto done; 681 } 682 ret = 0; 683 684 done: 685 qobject_unref(qdict); 686 bdrv_unref(bs); 687 qapi_free_BlockdevCreateOptions(create_options); 688 return ret; 689 } 690 691 692 static int parallels_probe(const uint8_t *buf, int buf_size, 693 const char *filename) 694 { 695 const ParallelsHeader *ph = (const void *)buf; 696 697 if (buf_size < sizeof(ParallelsHeader)) { 698 return 0; 699 } 700 701 if ((!memcmp(ph->magic, HEADER_MAGIC, 16) || 702 !memcmp(ph->magic, HEADER_MAGIC2, 16)) && 703 (le32_to_cpu(ph->version) == HEADER_VERSION)) { 704 return 100; 705 } 706 707 return 0; 708 } 709 710 static int parallels_update_header(BlockDriverState *bs) 711 { 712 BDRVParallelsState *s = bs->opaque; 713 unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs), 714 sizeof(ParallelsHeader)); 715 716 if (size > s->header_size) { 717 size = s->header_size; 718 } 719 return bdrv_pwrite_sync(bs->file, 0, s->header, size); 720 } 721 722 static int parallels_open(BlockDriverState *bs, QDict *options, int flags, 723 Error **errp) 724 { 725 BDRVParallelsState *s = bs->opaque; 726 ParallelsHeader ph; 727 int ret, size, i; 728 QemuOpts *opts = NULL; 729 Error *local_err = NULL; 730 char *buf; 731 732 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, 733 false, errp); 734 if (!bs->file) { 735 return -EINVAL; 736 } 737 738 ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph)); 739 if (ret < 0) { 740 goto fail; 741 } 742 743 bs->total_sectors = le64_to_cpu(ph.nb_sectors); 744 745 if (le32_to_cpu(ph.version) != HEADER_VERSION) { 746 goto fail_format; 747 } 748 if (!memcmp(ph.magic, HEADER_MAGIC, 16)) { 749 s->off_multiplier = 1; 750 bs->total_sectors = 0xffffffff & bs->total_sectors; 751 } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) { 752 s->off_multiplier = le32_to_cpu(ph.tracks); 753 } else { 754 goto fail_format; 755 } 756 757 s->tracks = le32_to_cpu(ph.tracks); 758 if (s->tracks == 0) { 759 error_setg(errp, "Invalid image: Zero sectors per track"); 760 ret = -EINVAL; 761 goto fail; 762 } 763 if (s->tracks > INT32_MAX/513) { 764 error_setg(errp, "Invalid image: Too big cluster"); 765 ret = -EFBIG; 766 goto fail; 767 } 768 769 s->bat_size = le32_to_cpu(ph.bat_entries); 770 if (s->bat_size > INT_MAX / sizeof(uint32_t)) { 771 error_setg(errp, "Catalog too large"); 772 ret = -EFBIG; 773 goto fail; 774 } 775 776 size = bat_entry_off(s->bat_size); 777 s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs)); 778 s->header = qemu_try_blockalign(bs->file->bs, s->header_size); 779 if (s->header == NULL) { 780 ret = -ENOMEM; 781 goto fail; 782 } 783 s->data_end = le32_to_cpu(ph.data_off); 784 if (s->data_end == 0) { 785 s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE); 786 } 787 if (s->data_end < s->header_size) { 788 /* there is not enough unused space to fit to block align between BAT 789 and actual data. We can't avoid read-modify-write... */ 790 s->header_size = size; 791 } 792 793 ret = bdrv_pread(bs->file, 0, s->header, s->header_size); 794 if (ret < 0) { 795 goto fail; 796 } 797 s->bat_bitmap = (uint32_t *)(s->header + 1); 798 799 for (i = 0; i < s->bat_size; i++) { 800 int64_t off = bat2sect(s, i); 801 if (off >= s->data_end) { 802 s->data_end = off + s->tracks; 803 } 804 } 805 806 if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) { 807 /* Image was not closed correctly. The check is mandatory */ 808 s->header_unclean = true; 809 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { 810 error_setg(errp, "parallels: Image was not closed correctly; " 811 "cannot be opened read/write"); 812 ret = -EACCES; 813 goto fail; 814 } 815 } 816 817 opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, &local_err); 818 if (local_err != NULL) { 819 goto fail_options; 820 } 821 822 qemu_opts_absorb_qdict(opts, options, &local_err); 823 if (local_err != NULL) { 824 goto fail_options; 825 } 826 827 s->prealloc_size = 828 qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0); 829 s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS); 830 buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE); 831 s->prealloc_mode = qapi_enum_parse(&prealloc_mode_lookup, buf, 832 PRL_PREALLOC_MODE_FALLOCATE, 833 &local_err); 834 g_free(buf); 835 if (local_err != NULL) { 836 goto fail_options; 837 } 838 839 if (!bdrv_has_zero_init(bs->file->bs)) { 840 s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE; 841 } 842 843 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_INACTIVE)) { 844 s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC); 845 ret = parallels_update_header(bs); 846 if (ret < 0) { 847 goto fail; 848 } 849 } 850 851 s->bat_dirty_block = 4 * getpagesize(); 852 s->bat_dirty_bmap = 853 bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block)); 854 855 /* Disable migration until bdrv_invalidate_cache method is added */ 856 error_setg(&s->migration_blocker, "The Parallels format used by node '%s' " 857 "does not support live migration", 858 bdrv_get_device_or_node_name(bs)); 859 ret = migrate_add_blocker(s->migration_blocker, &local_err); 860 if (local_err) { 861 error_propagate(errp, local_err); 862 error_free(s->migration_blocker); 863 goto fail; 864 } 865 qemu_co_mutex_init(&s->lock); 866 return 0; 867 868 fail_format: 869 error_setg(errp, "Image not in Parallels format"); 870 ret = -EINVAL; 871 fail: 872 qemu_vfree(s->header); 873 return ret; 874 875 fail_options: 876 error_propagate(errp, local_err); 877 ret = -EINVAL; 878 goto fail; 879 } 880 881 882 static void parallels_close(BlockDriverState *bs) 883 { 884 BDRVParallelsState *s = bs->opaque; 885 886 if ((bs->open_flags & BDRV_O_RDWR) && !(bs->open_flags & BDRV_O_INACTIVE)) { 887 s->header->inuse = 0; 888 parallels_update_header(bs); 889 bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS, 890 PREALLOC_MODE_OFF, 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_format_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 .supports_backing = true, 913 .bdrv_co_create = parallels_co_create, 914 .bdrv_co_create_opts = parallels_co_create_opts, 915 .bdrv_co_check = parallels_co_check, 916 .create_opts = ¶llels_create_opts, 917 }; 918 919 static void bdrv_parallels_init(void) 920 { 921 bdrv_register(&bdrv_parallels); 922 } 923 924 block_init(bdrv_parallels_init); 925