block/parallels.c

   1 /*
   2  * Block driver for Parallels disk image format
   3  *
   4  * Copyright (c) 2007 Alex Beregszaszi
   5  * Copyright (c) 2015 Denis V. Lunev <den@openvz.org>
   6  *
   7  * This code was originally based on comparing different disk images created
   8  * by Parallels. Currently it is based on opened OpenVZ sources
   9  * available at
  10  *     http://git.openvz.org/?p=ploop;a=summary
  11  *
  12  * Permission is hereby granted, free of charge, to any person obtaining a copy
  13  * of this software and associated documentation files (the "Software"), to deal
  14  * in the Software without restriction, including without limitation the rights
  15  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  16  * copies of the Software, and to permit persons to whom the Software is
  17  * furnished to do so, subject to the following conditions:
  18  *
  19  * The above copyright notice and this permission notice shall be included in
  20  * all copies or substantial portions of the Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  25  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  26  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  27  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  28  * THE SOFTWARE.
  29  */
  30 #include "qemu-common.h"
  31 #include "block/block_int.h"
  32 #include "qemu/module.h"
  33 #include "qemu/bitmap.h"
  34 #include "qapi/util.h"
  35
  36 /**************************************************************/
  37
  38 #define HEADER_MAGIC "WithoutFreeSpace"
  39 #define HEADER_MAGIC2 "WithouFreSpacExt"
  40 #define HEADER_VERSION 2
  41 #define HEADER_INUSE_MAGIC  (0x746F6E59)
  42
  43 #define DEFAULT_CLUSTER_SIZE 1048576        /* 1 MiB */
  44
  45
  46 // always little-endian
  47 typedef struct ParallelsHeader {
  48     char magic[16]; // "WithoutFreeSpace"
  49     uint32_t version;
  50     uint32_t heads;
  51     uint32_t cylinders;
  52     uint32_t tracks;
  53     uint32_t bat_entries;
  54     uint64_t nb_sectors;
  55     uint32_t inuse;
  56     uint32_t data_off;
  57     char padding[12];
  58 } QEMU_PACKED ParallelsHeader;
  59
  60
  61 typedef enum ParallelsPreallocMode {
  62     PRL_PREALLOC_MODE_FALLOCATE = 0,
  63     PRL_PREALLOC_MODE_TRUNCATE = 1,
  64     PRL_PREALLOC_MODE__MAX = 2,
  65 } ParallelsPreallocMode;
  66
  67 static const char *prealloc_mode_lookup[] = {
  68     "falloc",
  69     "truncate",
  70     NULL,
  71 };
  72
  73
  74 typedef struct BDRVParallelsState {
  75     /** Locking is conservative, the lock protects
  76      *   - image file extending (truncate, fallocate)
  77      *   - any access to block allocation table
  78      */
  79     CoMutex lock;
  80
  81     ParallelsHeader *header;
  82     uint32_t header_size;
  83     bool header_unclean;
  84
  85     unsigned long *bat_dirty_bmap;
  86     unsigned int  bat_dirty_block;
  87
  88     uint32_t *bat_bitmap;
  89     unsigned int bat_size;
  90
  91     int64_t  data_end;
  92     uint64_t prealloc_size;
  93     ParallelsPreallocMode prealloc_mode;
  94
  95     unsigned int tracks;
  96
  97     unsigned int off_multiplier;
  98 } BDRVParallelsState;
  99
 100
 101 #define PARALLELS_OPT_PREALLOC_MODE     "prealloc-mode"
 102 #define PARALLELS_OPT_PREALLOC_SIZE     "prealloc-size"
 103
 104 static QemuOptsList parallels_runtime_opts = {
 105     .name = "parallels",
 106     .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head),
 107     .desc = {
 108         {
 109             .name = PARALLELS_OPT_PREALLOC_SIZE,
 110             .type = QEMU_OPT_SIZE,
 111             .help = "Preallocation size on image expansion",
 112             .def_value_str = "128MiB",
 113         },
 114         {
 115             .name = PARALLELS_OPT_PREALLOC_MODE,
 116             .type = QEMU_OPT_STRING,
 117             .help = "Preallocation mode on image expansion "
 118                     "(allowed values: falloc, truncate)",
 119             .def_value_str = "falloc",
 120         },
 121         { /* end of list */ },
 122     },
 123 };
 124
 125
 126 static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx)
 127 {
 128     return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier;
 129 }
 130
 131 static uint32_t bat_entry_off(uint32_t idx)
 132 {
 133     return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx;
 134 }
 135
 136 static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num)
 137 {
 138     uint32_t index, offset;
 139
 140     index = sector_num / s->tracks;
 141     offset = sector_num % s->tracks;
 142
 143     /* not allocated */
 144     if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) {
 145         return -1;
 146     }
 147     return bat2sect(s, index) + offset;
 148 }
 149
 150 static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num,
 151         int nb_sectors)
 152 {
 153     int ret = s->tracks - sector_num % s->tracks;
 154     return MIN(nb_sectors, ret);
 155 }
 156
 157 static int64_t block_status(BDRVParallelsState *s, int64_t sector_num,
 158                             int nb_sectors, int *pnum)
 159 {
 160     int64_t start_off = -2, prev_end_off = -2;
 161
 162     *pnum = 0;
 163     while (nb_sectors > 0 || start_off == -2) {
 164         int64_t offset = seek_to_sector(s, sector_num);
 165         int to_end;
 166
 167         if (start_off == -2) {
 168             start_off = offset;
 169             prev_end_off = offset;
 170         } else if (offset != prev_end_off) {
 171             break;
 172         }
 173
 174         to_end = cluster_remainder(s, sector_num, nb_sectors);
 175         nb_sectors -= to_end;
 176         sector_num += to_end;
 177         *pnum += to_end;
 178
 179         if (offset > 0) {
 180             prev_end_off += to_end;
 181         }
 182     }
 183     return start_off;
 184 }
 185
 186 static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num,
 187                                  int nb_sectors, int *pnum)
 188 {
 189     BDRVParallelsState *s = bs->opaque;
 190     uint32_t idx, to_allocate, i;
 191     int64_t pos, space;
 192
 193     pos = block_status(s, sector_num, nb_sectors, pnum);
 194     if (pos > 0) {
 195         return pos;
 196     }
 197
 198     idx = sector_num / s->tracks;
 199     if (idx >= s->bat_size) {
 200         return -EINVAL;
 201     }
 202
 203     to_allocate = (sector_num + *pnum + s->tracks - 1) / s->tracks - idx;
 204     space = to_allocate * s->tracks;
 205     if (s->data_end + space > bdrv_getlength(bs->file->bs) >> BDRV_SECTOR_BITS) {
 206         int ret;
 207         space += s->prealloc_size;
 208         if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) {
 209             ret = bdrv_write_zeroes(bs->file->bs, s->data_end, space, 0);
 210         } else {
 211             ret = bdrv_truncate(bs->file->bs,
 212                                 (s->data_end + space) << BDRV_SECTOR_BITS);
 213         }
 214         if (ret < 0) {
 215             return ret;
 216         }
 217     }
 218
 219     for (i = 0; i < to_allocate; i++) {
 220         s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier);
 221         s->data_end += s->tracks;
 222         bitmap_set(s->bat_dirty_bmap,
 223                    bat_entry_off(idx + i) / s->bat_dirty_block, 1);
 224     }
 225
 226     return bat2sect(s, idx) + sector_num % s->tracks;
 227 }
 228
 229
 230 static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs)
 231 {
 232     BDRVParallelsState *s = bs->opaque;
 233     unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block);
 234     unsigned long bit;
 235
 236     qemu_co_mutex_lock(&s->lock);
 237
 238     bit = find_first_bit(s->bat_dirty_bmap, size);
 239     while (bit < size) {
 240         uint32_t off = bit * s->bat_dirty_block;
 241         uint32_t to_write = s->bat_dirty_block;
 242         int ret;
 243
 244         if (off + to_write > s->header_size) {
 245             to_write = s->header_size - off;
 246         }
 247         ret = bdrv_pwrite(bs->file->bs, off, (uint8_t *)s->header + off,
 248                           to_write);
 249         if (ret < 0) {
 250             qemu_co_mutex_unlock(&s->lock);
 251             return ret;
 252         }
 253         bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1);
 254     }
 255     bitmap_zero(s->bat_dirty_bmap, size);
 256
 257     qemu_co_mutex_unlock(&s->lock);
 258     return 0;
 259 }
 260
 261
 262 static int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs,
 263         int64_t sector_num, int nb_sectors, int *pnum)
 264 {
 265     BDRVParallelsState *s = bs->opaque;
 266     int64_t offset;
 267
 268     qemu_co_mutex_lock(&s->lock);
 269     offset = block_status(s, sector_num, nb_sectors, pnum);
 270     qemu_co_mutex_unlock(&s->lock);
 271
 272     if (offset < 0) {
 273         return 0;
 274     }
 275
 276     return (offset << BDRV_SECTOR_BITS) |
 277         BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
 278 }
 279
 280 static coroutine_fn int parallels_co_writev(BlockDriverState *bs,
 281         int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
 282 {
 283     BDRVParallelsState *s = bs->opaque;
 284     uint64_t bytes_done = 0;
 285     QEMUIOVector hd_qiov;
 286     int ret = 0;
 287
 288     qemu_iovec_init(&hd_qiov, qiov->niov);
 289
 290     while (nb_sectors > 0) {
 291         int64_t position;
 292         int n, nbytes;
 293
 294         qemu_co_mutex_lock(&s->lock);
 295         position = allocate_clusters(bs, sector_num, nb_sectors, &n);
 296         qemu_co_mutex_unlock(&s->lock);
 297         if (position < 0) {
 298             ret = (int)position;
 299             break;
 300         }
 301
 302         nbytes = n << BDRV_SECTOR_BITS;
 303
 304         qemu_iovec_reset(&hd_qiov);
 305         qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
 306
 307         ret = bdrv_co_writev(bs->file->bs, position, n, &hd_qiov);
 308         if (ret < 0) {
 309             break;
 310         }
 311
 312         nb_sectors -= n;
 313         sector_num += n;
 314         bytes_done += nbytes;
 315     }
 316
 317     qemu_iovec_destroy(&hd_qiov);
 318     return ret;
 319 }
 320
 321 static coroutine_fn int parallels_co_readv(BlockDriverState *bs,
 322         int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
 323 {
 324     BDRVParallelsState *s = bs->opaque;
 325     uint64_t bytes_done = 0;
 326     QEMUIOVector hd_qiov;
 327     int ret = 0;
 328
 329     qemu_iovec_init(&hd_qiov, qiov->niov);
 330
 331     while (nb_sectors > 0) {
 332         int64_t position;
 333         int n, nbytes;
 334
 335         qemu_co_mutex_lock(&s->lock);
 336         position = block_status(s, sector_num, nb_sectors, &n);
 337         qemu_co_mutex_unlock(&s->lock);
 338
 339         nbytes = n << BDRV_SECTOR_BITS;
 340
 341         if (position < 0) {
 342             qemu_iovec_memset(qiov, bytes_done, 0, nbytes);
 343         } else {
 344             qemu_iovec_reset(&hd_qiov);
 345             qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
 346
 347             ret = bdrv_co_readv(bs->file->bs, position, n, &hd_qiov);
 348             if (ret < 0) {
 349                 break;
 350             }
 351         }
 352
 353         nb_sectors -= n;
 354         sector_num += n;
 355         bytes_done += nbytes;
 356     }
 357
 358     qemu_iovec_destroy(&hd_qiov);
 359     return ret;
 360 }
 361
 362
 363 static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res,
 364                            BdrvCheckMode fix)
 365 {
 366     BDRVParallelsState *s = bs->opaque;
 367     int64_t size, prev_off, high_off;
 368     int ret;
 369     uint32_t i;
 370     bool flush_bat = false;
 371     int cluster_size = s->tracks << BDRV_SECTOR_BITS;
 372
 373     size = bdrv_getlength(bs->file->bs);
 374     if (size < 0) {
 375         res->check_errors++;
 376         return size;
 377     }
 378
 379     if (s->header_unclean) {
 380         fprintf(stderr, "%s image was not closed correctly\n",
 381                 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR");
 382         res->corruptions++;
 383         if (fix & BDRV_FIX_ERRORS) {
 384             /* parallels_close will do the job right */
 385             res->corruptions_fixed++;
 386             s->header_unclean = false;
 387         }
 388     }
 389
 390     res->bfi.total_clusters = s->bat_size;
 391     res->bfi.compressed_clusters = 0; /* compression is not supported */
 392
 393     high_off = 0;
 394     prev_off = 0;
 395     for (i = 0; i < s->bat_size; i++) {
 396         int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS;
 397         if (off == 0) {
 398             prev_off = 0;
 399             continue;
 400         }
 401
 402         /* cluster outside the image */
 403         if (off > size) {
 404             fprintf(stderr, "%s cluster %u is outside image\n",
 405                     fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i);
 406             res->corruptions++;
 407             if (fix & BDRV_FIX_ERRORS) {
 408                 prev_off = 0;
 409                 s->bat_bitmap[i] = 0;
 410                 res->corruptions_fixed++;
 411                 flush_bat = true;
 412                 continue;
 413             }
 414         }
 415
 416         res->bfi.allocated_clusters++;
 417         if (off > high_off) {
 418             high_off = off;
 419         }
 420
 421         if (prev_off != 0 && (prev_off + cluster_size) != off) {
 422             res->bfi.fragmented_clusters++;
 423         }
 424         prev_off = off;
 425     }
 426
 427     if (flush_bat) {
 428         ret = bdrv_pwrite_sync(bs->file->bs, 0, s->header, s->header_size);
 429         if (ret < 0) {
 430             res->check_errors++;
 431             return ret;
 432         }
 433     }
 434
 435     res->image_end_offset = high_off + cluster_size;
 436     if (size > res->image_end_offset) {
 437         int64_t count;
 438         count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size);
 439         fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n",
 440                 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR",
 441                 size - res->image_end_offset);
 442         res->leaks += count;
 443         if (fix & BDRV_FIX_LEAKS) {
 444             ret = bdrv_truncate(bs->file->bs, res->image_end_offset);
 445             if (ret < 0) {
 446                 res->check_errors++;
 447                 return ret;
 448             }
 449             res->leaks_fixed += count;
 450         }
 451     }
 452
 453     return 0;
 454 }
 455
 456
 457 static int parallels_create(const char *filename, QemuOpts *opts, Error **errp)
 458 {
 459     int64_t total_size, cl_size;
 460     uint8_t tmp[BDRV_SECTOR_SIZE];
 461     Error *local_err = NULL;
 462     BlockDriverState *file;
 463     uint32_t bat_entries, bat_sectors;
 464     ParallelsHeader header;
 465     int ret;
 466
 467     total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
 468                           BDRV_SECTOR_SIZE);
 469     cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE,
 470                           DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE);
 471
 472     ret = bdrv_create_file(filename, opts, &local_err);
 473     if (ret < 0) {
 474         error_propagate(errp, local_err);
 475         return ret;
 476     }
 477
 478     file = NULL;
 479     ret = bdrv_open(&file, filename, NULL, NULL,
 480                     BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err);
 481     if (ret < 0) {
 482         error_propagate(errp, local_err);
 483         return ret;
 484     }
 485     ret = bdrv_truncate(file, 0);
 486     if (ret < 0) {
 487         goto exit;
 488     }
 489
 490     bat_entries = DIV_ROUND_UP(total_size, cl_size);
 491     bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size);
 492     bat_sectors = (bat_sectors *  cl_size) >> BDRV_SECTOR_BITS;
 493
 494     memset(&header, 0, sizeof(header));
 495     memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic));
 496     header.version = cpu_to_le32(HEADER_VERSION);
 497     /* don't care much about geometry, it is not used on image level */
 498     header.heads = cpu_to_le32(16);
 499     header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE / 16 / 32);
 500     header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS);
 501     header.bat_entries = cpu_to_le32(bat_entries);
 502     header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE));
 503     header.data_off = cpu_to_le32(bat_sectors);
 504
 505     /* write all the data */
 506     memset(tmp, 0, sizeof(tmp));
 507     memcpy(tmp, &header, sizeof(header));
 508
 509     ret = bdrv_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE);
 510     if (ret < 0) {
 511         goto exit;
 512     }
 513     ret = bdrv_write_zeroes(file, 1, bat_sectors - 1, 0);
 514     if (ret < 0) {
 515         goto exit;
 516     }
 517     ret = 0;
 518
 519 done:
 520     bdrv_unref(file);
 521     return ret;
 522
 523 exit:
 524     error_setg_errno(errp, -ret, "Failed to create Parallels image");
 525     goto done;
 526 }
 527
 528
 529 static int parallels_probe(const uint8_t *buf, int buf_size,
 530                            const char *filename)
 531 {
 532     const ParallelsHeader *ph = (const void *)buf;
 533
 534     if (buf_size < sizeof(ParallelsHeader)) {
 535         return 0;
 536     }
 537
 538     if ((!memcmp(ph->magic, HEADER_MAGIC, 16) ||
 539            !memcmp(ph->magic, HEADER_MAGIC2, 16)) &&
 540            (le32_to_cpu(ph->version) == HEADER_VERSION)) {
 541         return 100;
 542     }
 543
 544     return 0;
 545 }
 546
 547 static int parallels_update_header(BlockDriverState *bs)
 548 {
 549     BDRVParallelsState *s = bs->opaque;
 550     unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs),
 551                         sizeof(ParallelsHeader));
 552
 553     if (size > s->header_size) {
 554         size = s->header_size;
 555     }
 556     return bdrv_pwrite_sync(bs->file->bs, 0, s->header, size);
 557 }
 558
 559 static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
 560                           Error **errp)
 561 {
 562     BDRVParallelsState *s = bs->opaque;
 563     ParallelsHeader ph;
 564     int ret, size, i;
 565     QemuOpts *opts = NULL;
 566     Error *local_err = NULL;
 567     char *buf;
 568
 569     ret = bdrv_pread(bs->file->bs, 0, &ph, sizeof(ph));
 570     if (ret < 0) {
 571         goto fail;
 572     }
 573
 574     bs->total_sectors = le64_to_cpu(ph.nb_sectors);
 575
 576     if (le32_to_cpu(ph.version) != HEADER_VERSION) {
 577         goto fail_format;
 578     }
 579     if (!memcmp(ph.magic, HEADER_MAGIC, 16)) {
 580         s->off_multiplier = 1;
 581         bs->total_sectors = 0xffffffff & bs->total_sectors;
 582     } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) {
 583         s->off_multiplier = le32_to_cpu(ph.tracks);
 584     } else {
 585         goto fail_format;
 586     }
 587
 588     s->tracks = le32_to_cpu(ph.tracks);
 589     if (s->tracks == 0) {
 590         error_setg(errp, "Invalid image: Zero sectors per track");
 591         ret = -EINVAL;
 592         goto fail;
 593     }
 594     if (s->tracks > INT32_MAX/513) {
 595         error_setg(errp, "Invalid image: Too big cluster");
 596         ret = -EFBIG;
 597         goto fail;
 598     }
 599
 600     s->bat_size = le32_to_cpu(ph.bat_entries);
 601     if (s->bat_size > INT_MAX / sizeof(uint32_t)) {
 602         error_setg(errp, "Catalog too large");
 603         ret = -EFBIG;
 604         goto fail;
 605     }
 606
 607     size = bat_entry_off(s->bat_size);
 608     s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs));
 609     s->header = qemu_try_blockalign(bs->file->bs, s->header_size);
 610     if (s->header == NULL) {
 611         ret = -ENOMEM;
 612         goto fail;
 613     }
 614     s->data_end = le32_to_cpu(ph.data_off);
 615     if (s->data_end == 0) {
 616         s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE);
 617     }
 618     if (s->data_end < s->header_size) {
 619         /* there is not enough unused space to fit to block align between BAT
 620            and actual data. We can't avoid read-modify-write... */
 621         s->header_size = size;
 622     }
 623
 624     ret = bdrv_pread(bs->file->bs, 0, s->header, s->header_size);
 625     if (ret < 0) {
 626         goto fail;
 627     }
 628     s->bat_bitmap = (uint32_t *)(s->header + 1);
 629
 630     for (i = 0; i < s->bat_size; i++) {
 631         int64_t off = bat2sect(s, i);
 632         if (off >= s->data_end) {
 633             s->data_end = off + s->tracks;
 634         }
 635     }
 636
 637     if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) {
 638         /* Image was not closed correctly. The check is mandatory */
 639         s->header_unclean = true;
 640         if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) {
 641             error_setg(errp, "parallels: Image was not closed correctly; "
 642                        "cannot be opened read/write");
 643             ret = -EACCES;
 644             goto fail;
 645         }
 646     }
 647
 648     opts = qemu_opts_create(&parallels_runtime_opts, NULL, 0, &local_err);
 649     if (local_err != NULL) {
 650         goto fail_options;
 651     }
 652
 653     qemu_opts_absorb_qdict(opts, options, &local_err);
 654     if (local_err != NULL) {
 655         goto fail_options;
 656     }
 657
 658     s->prealloc_size =
 659         qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0);
 660     s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS);
 661     buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE);
 662     s->prealloc_mode = qapi_enum_parse(prealloc_mode_lookup, buf,
 663             PRL_PREALLOC_MODE__MAX, PRL_PREALLOC_MODE_FALLOCATE, &local_err);
 664     g_free(buf);
 665     if (local_err != NULL) {
 666         goto fail_options;
 667     }
 668     if (!bdrv_has_zero_init(bs->file->bs) ||
 669             bdrv_truncate(bs->file->bs, bdrv_getlength(bs->file->bs)) != 0) {
 670         s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE;
 671     }
 672
 673     if (flags & BDRV_O_RDWR) {
 674         s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC);
 675         ret = parallels_update_header(bs);
 676         if (ret < 0) {
 677             goto fail;
 678         }
 679     }
 680
 681     s->bat_dirty_block = 4 * getpagesize();
 682     s->bat_dirty_bmap =
 683         bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block));
 684
 685     qemu_co_mutex_init(&s->lock);
 686     return 0;
 687
 688 fail_format:
 689     error_setg(errp, "Image not in Parallels format");
 690     ret = -EINVAL;
 691 fail:
 692     qemu_vfree(s->header);
 693     return ret;
 694
 695 fail_options:
 696     error_propagate(errp, local_err);
 697     ret = -EINVAL;
 698     goto fail;
 699 }
 700
 701
 702 static void parallels_close(BlockDriverState *bs)
 703 {
 704     BDRVParallelsState *s = bs->opaque;
 705
 706     if (bs->open_flags & BDRV_O_RDWR) {
 707         s->header->inuse = 0;
 708         parallels_update_header(bs);
 709     }
 710
 711     if (bs->open_flags & BDRV_O_RDWR) {
 712         bdrv_truncate(bs->file->bs, s->data_end << BDRV_SECTOR_BITS);
 713     }
 714
 715     g_free(s->bat_dirty_bmap);
 716     qemu_vfree(s->header);
 717 }
 718
 719 static QemuOptsList parallels_create_opts = {
 720     .name = "parallels-create-opts",
 721     .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head),
 722     .desc = {
 723         {
 724             .name = BLOCK_OPT_SIZE,
 725             .type = QEMU_OPT_SIZE,
 726             .help = "Virtual disk size",
 727         },
 728         {
 729             .name = BLOCK_OPT_CLUSTER_SIZE,
 730             .type = QEMU_OPT_SIZE,
 731             .help = "Parallels image cluster size",
 732             .def_value_str = stringify(DEFAULT_CLUSTER_SIZE),
 733         },
 734         { /* end of list */ }
 735     }
 736 };
 737
 738 static BlockDriver bdrv_parallels = {
 739     .format_name        = "parallels",
 740     .instance_size      = sizeof(BDRVParallelsState),
 741     .bdrv_probe         = parallels_probe,
 742     .bdrv_open          = parallels_open,
 743     .bdrv_close         = parallels_close,
 744     .bdrv_co_get_block_status = parallels_co_get_block_status,
 745     .bdrv_has_zero_init       = bdrv_has_zero_init_1,
 746     .bdrv_co_flush_to_os      = parallels_co_flush_to_os,
 747     .bdrv_co_readv  = parallels_co_readv,
 748     .bdrv_co_writev = parallels_co_writev,
 749
 750     .bdrv_create    = parallels_create,
 751     .bdrv_check     = parallels_check,
 752     .create_opts    = &parallels_create_opts,
 753 };
 754
 755 static void bdrv_parallels_init(void)
 756 {
 757     bdrv_register(&bdrv_parallels);
 758 }
 759
 760 block_init(bdrv_parallels_init);