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 void parallels_set_bat_entry(BDRVParallelsState *s, 169 uint32_t index, uint32_t offset) 170 { 171 s->bat_bitmap[index] = cpu_to_le32(offset); 172 bitmap_set(s->bat_dirty_bmap, bat_entry_off(index) / s->bat_dirty_block, 1); 173 } 174 175 static int64_t coroutine_fn GRAPH_RDLOCK 176 allocate_clusters(BlockDriverState *bs, int64_t sector_num, 177 int nb_sectors, int *pnum) 178 { 179 int ret = 0; 180 BDRVParallelsState *s = bs->opaque; 181 int64_t pos, space, idx, to_allocate, i, len; 182 183 pos = block_status(s, sector_num, nb_sectors, pnum); 184 if (pos > 0) { 185 return pos; 186 } 187 188 idx = sector_num / s->tracks; 189 to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx; 190 191 /* This function is called only by parallels_co_writev(), which will never 192 * pass a sector_num at or beyond the end of the image (because the block 193 * layer never passes such a sector_num to that function). Therefore, idx 194 * is always below s->bat_size. 195 * block_status() will limit *pnum so that sector_num + *pnum will not 196 * exceed the image end. Therefore, idx + to_allocate cannot exceed 197 * s->bat_size. 198 * Note that s->bat_size is an unsigned int, therefore idx + to_allocate 199 * will always fit into a uint32_t. */ 200 assert(idx < s->bat_size && idx + to_allocate <= s->bat_size); 201 202 space = to_allocate * s->tracks; 203 len = bdrv_getlength(bs->file->bs); 204 if (len < 0) { 205 return len; 206 } 207 if (s->data_end + space > (len >> BDRV_SECTOR_BITS)) { 208 space += s->prealloc_size; 209 /* 210 * We require the expanded size to read back as zero. If the 211 * user permitted truncation, we try that; but if it fails, we 212 * force the safer-but-slower fallocate. 213 */ 214 if (s->prealloc_mode == PRL_PREALLOC_MODE_TRUNCATE) { 215 ret = bdrv_co_truncate(bs->file, 216 (s->data_end + space) << BDRV_SECTOR_BITS, 217 false, PREALLOC_MODE_OFF, 218 BDRV_REQ_ZERO_WRITE, NULL); 219 if (ret == -ENOTSUP) { 220 s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE; 221 } 222 } 223 if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) { 224 ret = bdrv_co_pwrite_zeroes(bs->file, 225 s->data_end << BDRV_SECTOR_BITS, 226 space << BDRV_SECTOR_BITS, 0); 227 } 228 if (ret < 0) { 229 return ret; 230 } 231 } 232 233 /* Try to read from backing to fill empty clusters 234 * FIXME: 1. previous write_zeroes may be redundant 235 * 2. most of data we read from backing will be rewritten by 236 * parallels_co_writev. On aligned-to-cluster write we do not need 237 * this read at all. 238 * 3. it would be good to combine write of data from backing and new 239 * data into one write call */ 240 if (bs->backing) { 241 int64_t nb_cow_sectors = to_allocate * s->tracks; 242 int64_t nb_cow_bytes = nb_cow_sectors << BDRV_SECTOR_BITS; 243 void *buf = qemu_blockalign(bs, nb_cow_bytes); 244 245 ret = bdrv_co_pread(bs->backing, idx * s->tracks * BDRV_SECTOR_SIZE, 246 nb_cow_bytes, buf, 0); 247 if (ret < 0) { 248 qemu_vfree(buf); 249 return ret; 250 } 251 252 ret = bdrv_co_pwrite(bs->file, s->data_end * BDRV_SECTOR_SIZE, 253 nb_cow_bytes, buf, 0); 254 qemu_vfree(buf); 255 if (ret < 0) { 256 return ret; 257 } 258 } 259 260 for (i = 0; i < to_allocate; i++) { 261 parallels_set_bat_entry(s, idx + i, s->data_end / s->off_multiplier); 262 s->data_end += s->tracks; 263 } 264 265 return bat2sect(s, idx) + sector_num % s->tracks; 266 } 267 268 269 static int coroutine_fn GRAPH_RDLOCK 270 parallels_co_flush_to_os(BlockDriverState *bs) 271 { 272 BDRVParallelsState *s = bs->opaque; 273 unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block); 274 unsigned long bit; 275 276 qemu_co_mutex_lock(&s->lock); 277 278 bit = find_first_bit(s->bat_dirty_bmap, size); 279 while (bit < size) { 280 uint32_t off = bit * s->bat_dirty_block; 281 uint32_t to_write = s->bat_dirty_block; 282 int ret; 283 284 if (off + to_write > s->header_size) { 285 to_write = s->header_size - off; 286 } 287 ret = bdrv_co_pwrite(bs->file, off, to_write, 288 (uint8_t *)s->header + off, 0); 289 if (ret < 0) { 290 qemu_co_mutex_unlock(&s->lock); 291 return ret; 292 } 293 bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1); 294 } 295 bitmap_zero(s->bat_dirty_bmap, size); 296 297 qemu_co_mutex_unlock(&s->lock); 298 return 0; 299 } 300 301 302 static int coroutine_fn parallels_co_block_status(BlockDriverState *bs, 303 bool want_zero, 304 int64_t offset, 305 int64_t bytes, 306 int64_t *pnum, 307 int64_t *map, 308 BlockDriverState **file) 309 { 310 BDRVParallelsState *s = bs->opaque; 311 int count; 312 313 assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE)); 314 qemu_co_mutex_lock(&s->lock); 315 offset = block_status(s, offset >> BDRV_SECTOR_BITS, 316 bytes >> BDRV_SECTOR_BITS, &count); 317 qemu_co_mutex_unlock(&s->lock); 318 319 *pnum = count * BDRV_SECTOR_SIZE; 320 if (offset < 0) { 321 return 0; 322 } 323 324 *map = offset * BDRV_SECTOR_SIZE; 325 *file = bs->file->bs; 326 return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID; 327 } 328 329 static int coroutine_fn GRAPH_RDLOCK 330 parallels_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 331 QEMUIOVector *qiov, int flags) 332 { 333 BDRVParallelsState *s = bs->opaque; 334 uint64_t bytes_done = 0; 335 QEMUIOVector hd_qiov; 336 int ret = 0; 337 338 qemu_iovec_init(&hd_qiov, qiov->niov); 339 340 while (nb_sectors > 0) { 341 int64_t position; 342 int n, nbytes; 343 344 qemu_co_mutex_lock(&s->lock); 345 position = allocate_clusters(bs, sector_num, nb_sectors, &n); 346 qemu_co_mutex_unlock(&s->lock); 347 if (position < 0) { 348 ret = (int)position; 349 break; 350 } 351 352 nbytes = n << BDRV_SECTOR_BITS; 353 354 qemu_iovec_reset(&hd_qiov); 355 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 356 357 ret = bdrv_co_pwritev(bs->file, position * BDRV_SECTOR_SIZE, nbytes, 358 &hd_qiov, 0); 359 if (ret < 0) { 360 break; 361 } 362 363 nb_sectors -= n; 364 sector_num += n; 365 bytes_done += nbytes; 366 } 367 368 qemu_iovec_destroy(&hd_qiov); 369 return ret; 370 } 371 372 static int coroutine_fn GRAPH_RDLOCK 373 parallels_co_readv(BlockDriverState *bs, int64_t sector_num, int nb_sectors, 374 QEMUIOVector *qiov) 375 { 376 BDRVParallelsState *s = bs->opaque; 377 uint64_t bytes_done = 0; 378 QEMUIOVector hd_qiov; 379 int ret = 0; 380 381 qemu_iovec_init(&hd_qiov, qiov->niov); 382 383 while (nb_sectors > 0) { 384 int64_t position; 385 int n, nbytes; 386 387 qemu_co_mutex_lock(&s->lock); 388 position = block_status(s, sector_num, nb_sectors, &n); 389 qemu_co_mutex_unlock(&s->lock); 390 391 nbytes = n << BDRV_SECTOR_BITS; 392 393 qemu_iovec_reset(&hd_qiov); 394 qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes); 395 396 if (position < 0) { 397 if (bs->backing) { 398 ret = bdrv_co_preadv(bs->backing, sector_num * BDRV_SECTOR_SIZE, 399 nbytes, &hd_qiov, 0); 400 if (ret < 0) { 401 break; 402 } 403 } else { 404 qemu_iovec_memset(&hd_qiov, 0, 0, nbytes); 405 } 406 } else { 407 ret = bdrv_co_preadv(bs->file, position * BDRV_SECTOR_SIZE, nbytes, 408 &hd_qiov, 0); 409 if (ret < 0) { 410 break; 411 } 412 } 413 414 nb_sectors -= n; 415 sector_num += n; 416 bytes_done += nbytes; 417 } 418 419 qemu_iovec_destroy(&hd_qiov); 420 return ret; 421 } 422 423 static void parallels_check_unclean(BlockDriverState *bs, 424 BdrvCheckResult *res, 425 BdrvCheckMode fix) 426 { 427 BDRVParallelsState *s = bs->opaque; 428 429 if (!s->header_unclean) { 430 return; 431 } 432 433 fprintf(stderr, "%s image was not closed correctly\n", 434 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR"); 435 res->corruptions++; 436 if (fix & BDRV_FIX_ERRORS) { 437 /* parallels_close will do the job right */ 438 res->corruptions_fixed++; 439 s->header_unclean = false; 440 } 441 } 442 443 static int coroutine_fn GRAPH_RDLOCK 444 parallels_check_outside_image(BlockDriverState *bs, BdrvCheckResult *res, 445 BdrvCheckMode fix) 446 { 447 BDRVParallelsState *s = bs->opaque; 448 uint32_t i; 449 int64_t off, high_off, size; 450 451 size = bdrv_getlength(bs->file->bs); 452 if (size < 0) { 453 res->check_errors++; 454 return size; 455 } 456 457 high_off = 0; 458 for (i = 0; i < s->bat_size; i++) { 459 off = bat2sect(s, i) << BDRV_SECTOR_BITS; 460 if (off + s->cluster_size > size) { 461 fprintf(stderr, "%s cluster %u is outside image\n", 462 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i); 463 res->corruptions++; 464 if (fix & BDRV_FIX_ERRORS) { 465 parallels_set_bat_entry(s, i, 0); 466 res->corruptions_fixed++; 467 } 468 continue; 469 } 470 if (high_off < off) { 471 high_off = off; 472 } 473 } 474 475 if (high_off == 0) { 476 res->image_end_offset = s->data_end << BDRV_SECTOR_BITS; 477 } else { 478 res->image_end_offset = high_off + s->cluster_size; 479 s->data_end = res->image_end_offset >> BDRV_SECTOR_BITS; 480 } 481 482 return 0; 483 } 484 485 static int coroutine_fn GRAPH_RDLOCK 486 parallels_check_leak(BlockDriverState *bs, BdrvCheckResult *res, 487 BdrvCheckMode fix) 488 { 489 BDRVParallelsState *s = bs->opaque; 490 int64_t size; 491 int ret; 492 493 size = bdrv_getlength(bs->file->bs); 494 if (size < 0) { 495 res->check_errors++; 496 return size; 497 } 498 499 if (size > res->image_end_offset) { 500 int64_t count; 501 count = DIV_ROUND_UP(size - res->image_end_offset, s->cluster_size); 502 fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n", 503 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR", 504 size - res->image_end_offset); 505 res->leaks += count; 506 if (fix & BDRV_FIX_LEAKS) { 507 Error *local_err = NULL; 508 509 /* 510 * In order to really repair the image, we must shrink it. 511 * That means we have to pass exact=true. 512 */ 513 ret = bdrv_co_truncate(bs->file, res->image_end_offset, true, 514 PREALLOC_MODE_OFF, 0, &local_err); 515 if (ret < 0) { 516 error_report_err(local_err); 517 res->check_errors++; 518 return ret; 519 } 520 res->leaks_fixed += count; 521 } 522 } 523 524 return 0; 525 } 526 527 static void parallels_collect_statistics(BlockDriverState *bs, 528 BdrvCheckResult *res, 529 BdrvCheckMode fix) 530 { 531 BDRVParallelsState *s = bs->opaque; 532 int64_t off, prev_off; 533 uint32_t i; 534 535 res->bfi.total_clusters = s->bat_size; 536 res->bfi.compressed_clusters = 0; /* compression is not supported */ 537 538 prev_off = 0; 539 for (i = 0; i < s->bat_size; i++) { 540 off = bat2sect(s, i) << BDRV_SECTOR_BITS; 541 /* 542 * If BDRV_FIX_ERRORS is not set, out-of-image BAT entries were not 543 * fixed. Skip not allocated and out-of-image BAT entries. 544 */ 545 if (off == 0 || off + s->cluster_size > res->image_end_offset) { 546 prev_off = 0; 547 continue; 548 } 549 550 if (prev_off != 0 && (prev_off + s->cluster_size) != off) { 551 res->bfi.fragmented_clusters++; 552 } 553 prev_off = off; 554 res->bfi.allocated_clusters++; 555 } 556 } 557 558 static int coroutine_fn GRAPH_RDLOCK 559 parallels_co_check(BlockDriverState *bs, BdrvCheckResult *res, 560 BdrvCheckMode fix) 561 { 562 BDRVParallelsState *s = bs->opaque; 563 int ret; 564 565 WITH_QEMU_LOCK_GUARD(&s->lock) { 566 parallels_check_unclean(bs, res, fix); 567 568 ret = parallels_check_outside_image(bs, res, fix); 569 if (ret < 0) { 570 return ret; 571 } 572 573 ret = parallels_check_leak(bs, res, fix); 574 if (ret < 0) { 575 return ret; 576 } 577 578 parallels_collect_statistics(bs, res, fix); 579 } 580 581 ret = bdrv_co_flush(bs); 582 if (ret < 0) { 583 res->check_errors++; 584 } 585 586 return ret; 587 } 588 589 590 static int coroutine_fn GRAPH_UNLOCKED 591 parallels_co_create(BlockdevCreateOptions* opts, Error **errp) 592 { 593 BlockdevCreateOptionsParallels *parallels_opts; 594 BlockDriverState *bs; 595 BlockBackend *blk; 596 int64_t total_size, cl_size; 597 uint32_t bat_entries, bat_sectors; 598 ParallelsHeader header; 599 uint8_t tmp[BDRV_SECTOR_SIZE]; 600 int ret; 601 602 assert(opts->driver == BLOCKDEV_DRIVER_PARALLELS); 603 parallels_opts = &opts->u.parallels; 604 605 /* Sanity checks */ 606 total_size = parallels_opts->size; 607 608 if (parallels_opts->has_cluster_size) { 609 cl_size = parallels_opts->cluster_size; 610 } else { 611 cl_size = DEFAULT_CLUSTER_SIZE; 612 } 613 614 /* XXX What is the real limit here? This is an insanely large maximum. */ 615 if (cl_size >= INT64_MAX / MAX_PARALLELS_IMAGE_FACTOR) { 616 error_setg(errp, "Cluster size is too large"); 617 return -EINVAL; 618 } 619 if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) { 620 error_setg(errp, "Image size is too large for this cluster size"); 621 return -E2BIG; 622 } 623 624 if (!QEMU_IS_ALIGNED(total_size, BDRV_SECTOR_SIZE)) { 625 error_setg(errp, "Image size must be a multiple of 512 bytes"); 626 return -EINVAL; 627 } 628 629 if (!QEMU_IS_ALIGNED(cl_size, BDRV_SECTOR_SIZE)) { 630 error_setg(errp, "Cluster size must be a multiple of 512 bytes"); 631 return -EINVAL; 632 } 633 634 /* Create BlockBackend to write to the image */ 635 bs = bdrv_co_open_blockdev_ref(parallels_opts->file, errp); 636 if (bs == NULL) { 637 return -EIO; 638 } 639 640 blk = blk_co_new_with_bs(bs, BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL, 641 errp); 642 if (!blk) { 643 ret = -EPERM; 644 goto out; 645 } 646 blk_set_allow_write_beyond_eof(blk, true); 647 648 /* Create image format */ 649 bat_entries = DIV_ROUND_UP(total_size, cl_size); 650 bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size); 651 bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS; 652 653 memset(&header, 0, sizeof(header)); 654 memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic)); 655 header.version = cpu_to_le32(HEADER_VERSION); 656 /* don't care much about geometry, it is not used on image level */ 657 header.heads = cpu_to_le32(HEADS_NUMBER); 658 header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE 659 / HEADS_NUMBER / SEC_IN_CYL); 660 header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS); 661 header.bat_entries = cpu_to_le32(bat_entries); 662 header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE)); 663 header.data_off = cpu_to_le32(bat_sectors); 664 665 /* write all the data */ 666 memset(tmp, 0, sizeof(tmp)); 667 memcpy(tmp, &header, sizeof(header)); 668 669 ret = blk_co_pwrite(blk, 0, BDRV_SECTOR_SIZE, tmp, 0); 670 if (ret < 0) { 671 goto exit; 672 } 673 ret = blk_co_pwrite_zeroes(blk, BDRV_SECTOR_SIZE, 674 (bat_sectors - 1) << BDRV_SECTOR_BITS, 0); 675 if (ret < 0) { 676 goto exit; 677 } 678 679 ret = 0; 680 out: 681 blk_co_unref(blk); 682 bdrv_co_unref(bs); 683 return ret; 684 685 exit: 686 error_setg_errno(errp, -ret, "Failed to create Parallels image"); 687 goto out; 688 } 689 690 static int coroutine_fn GRAPH_UNLOCKED 691 parallels_co_create_opts(BlockDriver *drv, const char *filename, 692 QemuOpts *opts, Error **errp) 693 { 694 BlockdevCreateOptions *create_options = NULL; 695 BlockDriverState *bs = NULL; 696 QDict *qdict; 697 Visitor *v; 698 int ret; 699 700 static const QDictRenames opt_renames[] = { 701 { BLOCK_OPT_CLUSTER_SIZE, "cluster-size" }, 702 { NULL, NULL }, 703 }; 704 705 /* Parse options and convert legacy syntax */ 706 qdict = qemu_opts_to_qdict_filtered(opts, NULL, ¶llels_create_opts, 707 true); 708 709 if (!qdict_rename_keys(qdict, opt_renames, errp)) { 710 ret = -EINVAL; 711 goto done; 712 } 713 714 /* Create and open the file (protocol layer) */ 715 ret = bdrv_co_create_file(filename, opts, errp); 716 if (ret < 0) { 717 goto done; 718 } 719 720 bs = bdrv_co_open(filename, NULL, NULL, 721 BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); 722 if (bs == NULL) { 723 ret = -EIO; 724 goto done; 725 } 726 727 /* Now get the QAPI type BlockdevCreateOptions */ 728 qdict_put_str(qdict, "driver", "parallels"); 729 qdict_put_str(qdict, "file", bs->node_name); 730 731 v = qobject_input_visitor_new_flat_confused(qdict, errp); 732 if (!v) { 733 ret = -EINVAL; 734 goto done; 735 } 736 737 visit_type_BlockdevCreateOptions(v, NULL, &create_options, errp); 738 visit_free(v); 739 if (!create_options) { 740 ret = -EINVAL; 741 goto done; 742 } 743 744 /* Silently round up sizes */ 745 create_options->u.parallels.size = 746 ROUND_UP(create_options->u.parallels.size, BDRV_SECTOR_SIZE); 747 create_options->u.parallels.cluster_size = 748 ROUND_UP(create_options->u.parallels.cluster_size, BDRV_SECTOR_SIZE); 749 750 /* Create the Parallels image (format layer) */ 751 ret = parallels_co_create(create_options, errp); 752 if (ret < 0) { 753 goto done; 754 } 755 ret = 0; 756 757 done: 758 qobject_unref(qdict); 759 bdrv_co_unref(bs); 760 qapi_free_BlockdevCreateOptions(create_options); 761 return ret; 762 } 763 764 765 static int parallels_probe(const uint8_t *buf, int buf_size, 766 const char *filename) 767 { 768 const ParallelsHeader *ph = (const void *)buf; 769 770 if (buf_size < sizeof(ParallelsHeader)) { 771 return 0; 772 } 773 774 if ((!memcmp(ph->magic, HEADER_MAGIC, 16) || 775 !memcmp(ph->magic, HEADER_MAGIC2, 16)) && 776 (le32_to_cpu(ph->version) == HEADER_VERSION)) { 777 return 100; 778 } 779 780 return 0; 781 } 782 783 static int parallels_update_header(BlockDriverState *bs) 784 { 785 BDRVParallelsState *s = bs->opaque; 786 unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs), 787 sizeof(ParallelsHeader)); 788 789 if (size > s->header_size) { 790 size = s->header_size; 791 } 792 return bdrv_pwrite_sync(bs->file, 0, size, s->header, 0); 793 } 794 795 static int parallels_open(BlockDriverState *bs, QDict *options, int flags, 796 Error **errp) 797 { 798 BDRVParallelsState *s = bs->opaque; 799 ParallelsHeader ph; 800 int ret, size, i; 801 int64_t file_nb_sectors; 802 QemuOpts *opts = NULL; 803 Error *local_err = NULL; 804 char *buf; 805 806 ret = bdrv_open_file_child(NULL, options, "file", bs, errp); 807 if (ret < 0) { 808 return ret; 809 } 810 811 file_nb_sectors = bdrv_nb_sectors(bs->file->bs); 812 if (file_nb_sectors < 0) { 813 return -EINVAL; 814 } 815 816 ret = bdrv_pread(bs->file, 0, sizeof(ph), &ph, 0); 817 if (ret < 0) { 818 goto fail; 819 } 820 821 bs->total_sectors = le64_to_cpu(ph.nb_sectors); 822 823 if (le32_to_cpu(ph.version) != HEADER_VERSION) { 824 goto fail_format; 825 } 826 if (!memcmp(ph.magic, HEADER_MAGIC, 16)) { 827 s->off_multiplier = 1; 828 bs->total_sectors = 0xffffffff & bs->total_sectors; 829 } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) { 830 s->off_multiplier = le32_to_cpu(ph.tracks); 831 } else { 832 goto fail_format; 833 } 834 835 s->tracks = le32_to_cpu(ph.tracks); 836 if (s->tracks == 0) { 837 error_setg(errp, "Invalid image: Zero sectors per track"); 838 ret = -EINVAL; 839 goto fail; 840 } 841 if (s->tracks > INT32_MAX/513) { 842 error_setg(errp, "Invalid image: Too big cluster"); 843 ret = -EFBIG; 844 goto fail; 845 } 846 s->cluster_size = s->tracks << BDRV_SECTOR_BITS; 847 848 s->bat_size = le32_to_cpu(ph.bat_entries); 849 if (s->bat_size > INT_MAX / sizeof(uint32_t)) { 850 error_setg(errp, "Catalog too large"); 851 ret = -EFBIG; 852 goto fail; 853 } 854 855 size = bat_entry_off(s->bat_size); 856 s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs)); 857 s->header = qemu_try_blockalign(bs->file->bs, s->header_size); 858 if (s->header == NULL) { 859 ret = -ENOMEM; 860 goto fail; 861 } 862 s->data_end = le32_to_cpu(ph.data_off); 863 if (s->data_end == 0) { 864 s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE); 865 } 866 if (s->data_end < s->header_size) { 867 /* there is not enough unused space to fit to block align between BAT 868 and actual data. We can't avoid read-modify-write... */ 869 s->header_size = size; 870 } 871 872 ret = bdrv_pread(bs->file, 0, s->header_size, s->header, 0); 873 if (ret < 0) { 874 goto fail; 875 } 876 s->bat_bitmap = (uint32_t *)(s->header + 1); 877 878 for (i = 0; i < s->bat_size; i++) { 879 int64_t off = bat2sect(s, i); 880 if (off >= file_nb_sectors) { 881 if (flags & BDRV_O_CHECK) { 882 continue; 883 } 884 error_setg(errp, "parallels: Offset %" PRIi64 " in BAT[%d] entry " 885 "is larger than file size (%" PRIi64 ")", 886 off << BDRV_SECTOR_BITS, i, 887 file_nb_sectors << BDRV_SECTOR_BITS); 888 ret = -EINVAL; 889 goto fail; 890 } 891 if (off >= s->data_end) { 892 s->data_end = off + s->tracks; 893 } 894 } 895 896 if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) { 897 /* Image was not closed correctly. The check is mandatory */ 898 s->header_unclean = true; 899 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { 900 error_setg(errp, "parallels: Image was not closed correctly; " 901 "cannot be opened read/write"); 902 ret = -EACCES; 903 goto fail; 904 } 905 } 906 907 opts = qemu_opts_create(¶llels_runtime_opts, NULL, 0, errp); 908 if (!opts) { 909 goto fail_options; 910 } 911 912 if (!qemu_opts_absorb_qdict(opts, options, errp)) { 913 goto fail_options; 914 } 915 916 s->prealloc_size = 917 qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0); 918 s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS); 919 buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE); 920 /* prealloc_mode can be downgraded later during allocate_clusters */ 921 s->prealloc_mode = qapi_enum_parse(&prealloc_mode_lookup, buf, 922 PRL_PREALLOC_MODE_FALLOCATE, 923 &local_err); 924 g_free(buf); 925 if (local_err != NULL) { 926 error_propagate(errp, local_err); 927 goto fail_options; 928 } 929 930 if (ph.ext_off) { 931 if (flags & BDRV_O_RDWR) { 932 /* 933 * It's unsafe to open image RW if there is an extension (as we 934 * don't support it). But parallels driver in QEMU historically 935 * ignores the extension, so print warning and don't care. 936 */ 937 warn_report("Format Extension ignored in RW mode"); 938 } else { 939 ret = parallels_read_format_extension( 940 bs, le64_to_cpu(ph.ext_off) << BDRV_SECTOR_BITS, errp); 941 if (ret < 0) { 942 goto fail; 943 } 944 } 945 } 946 947 if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_INACTIVE)) { 948 s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC); 949 ret = parallels_update_header(bs); 950 if (ret < 0) { 951 goto fail; 952 } 953 } 954 955 s->bat_dirty_block = 4 * qemu_real_host_page_size(); 956 s->bat_dirty_bmap = 957 bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block)); 958 959 /* Disable migration until bdrv_activate method is added */ 960 error_setg(&s->migration_blocker, "The Parallels format used by node '%s' " 961 "does not support live migration", 962 bdrv_get_device_or_node_name(bs)); 963 ret = migrate_add_blocker(s->migration_blocker, errp); 964 if (ret < 0) { 965 error_free(s->migration_blocker); 966 goto fail; 967 } 968 qemu_co_mutex_init(&s->lock); 969 return 0; 970 971 fail_format: 972 error_setg(errp, "Image not in Parallels format"); 973 fail_options: 974 ret = -EINVAL; 975 fail: 976 qemu_vfree(s->header); 977 return ret; 978 } 979 980 981 static void parallels_close(BlockDriverState *bs) 982 { 983 BDRVParallelsState *s = bs->opaque; 984 985 if ((bs->open_flags & BDRV_O_RDWR) && !(bs->open_flags & BDRV_O_INACTIVE)) { 986 s->header->inuse = 0; 987 parallels_update_header(bs); 988 989 /* errors are ignored, so we might as well pass exact=true */ 990 bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS, true, 991 PREALLOC_MODE_OFF, 0, NULL); 992 } 993 994 g_free(s->bat_dirty_bmap); 995 qemu_vfree(s->header); 996 997 migrate_del_blocker(s->migration_blocker); 998 error_free(s->migration_blocker); 999 } 1000 1001 static BlockDriver bdrv_parallels = { 1002 .format_name = "parallels", 1003 .instance_size = sizeof(BDRVParallelsState), 1004 .bdrv_probe = parallels_probe, 1005 .bdrv_open = parallels_open, 1006 .bdrv_close = parallels_close, 1007 .bdrv_child_perm = bdrv_default_perms, 1008 .bdrv_co_block_status = parallels_co_block_status, 1009 .bdrv_has_zero_init = bdrv_has_zero_init_1, 1010 .bdrv_co_flush_to_os = parallels_co_flush_to_os, 1011 .bdrv_co_readv = parallels_co_readv, 1012 .bdrv_co_writev = parallels_co_writev, 1013 .is_format = true, 1014 .supports_backing = true, 1015 .bdrv_co_create = parallels_co_create, 1016 .bdrv_co_create_opts = parallels_co_create_opts, 1017 .bdrv_co_check = parallels_co_check, 1018 .create_opts = ¶llels_create_opts, 1019 }; 1020 1021 static void bdrv_parallels_init(void) 1022 { 1023 bdrv_register(&bdrv_parallels); 1024 } 1025 1026 block_init(bdrv_parallels_init); 1027