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/osdep.h"
  31 #include "qapi/error.h"
  32 #include "qemu-common.h"
  33 #include "block/block_int.h"
  34 #include "sysemu/block-backend.h"
  35 #include "qemu/module.h"
  36 #include "qemu/bswap.h"
  37 #include "qemu/bitmap.h"
  38 #include "qapi/util.h"
  39
  40 /**************************************************************/
  41
  42 #define HEADER_MAGIC "WithoutFreeSpace"
  43 #define HEADER_MAGIC2 "WithouFreSpacExt"
  44 #define HEADER_VERSION 2
  45 #define HEADER_INUSE_MAGIC  (0x746F6E59)
  46
  47 #define DEFAULT_CLUSTER_SIZE 1048576        /* 1 MiB */
  48
  49
  50 // always little-endian
  51 typedef struct ParallelsHeader {
  52     char magic[16]; // "WithoutFreeSpace"
  53     uint32_t version;
  54     uint32_t heads;
  55     uint32_t cylinders;
  56     uint32_t tracks;
  57     uint32_t bat_entries;
  58     uint64_t nb_sectors;
  59     uint32_t inuse;
  60     uint32_t data_off;
  61     char padding[12];
  62 } QEMU_PACKED ParallelsHeader;
  63
  64
  65 typedef enum ParallelsPreallocMode {
  66     PRL_PREALLOC_MODE_FALLOCATE = 0,
  67     PRL_PREALLOC_MODE_TRUNCATE = 1,
  68     PRL_PREALLOC_MODE__MAX = 2,
  69 } ParallelsPreallocMode;
  70
  71 static const char *prealloc_mode_lookup[] = {
  72     "falloc",
  73     "truncate",
  74     NULL,
  75 };
  76
  77
  78 typedef struct BDRVParallelsState {
  79     /** Locking is conservative, the lock protects
  80      *   - image file extending (truncate, fallocate)
  81      *   - any access to block allocation table
  82      */
  83     CoMutex lock;
  84
  85     ParallelsHeader *header;
  86     uint32_t header_size;
  87     bool header_unclean;
  88
  89     unsigned long *bat_dirty_bmap;
  90     unsigned int  bat_dirty_block;
  91
  92     uint32_t *bat_bitmap;
  93     unsigned int bat_size;
  94
  95     int64_t  data_end;
  96     uint64_t prealloc_size;
  97     ParallelsPreallocMode prealloc_mode;
  98
  99     unsigned int tracks;
 100
 101     unsigned int off_multiplier;
 102 } BDRVParallelsState;
 103
 104
 105 #define PARALLELS_OPT_PREALLOC_MODE     "prealloc-mode"
 106 #define PARALLELS_OPT_PREALLOC_SIZE     "prealloc-size"
 107
 108 static QemuOptsList parallels_runtime_opts = {
 109     .name = "parallels",
 110     .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head),
 111     .desc = {
 112         {
 113             .name = PARALLELS_OPT_PREALLOC_SIZE,
 114             .type = QEMU_OPT_SIZE,
 115             .help = "Preallocation size on image expansion",
 116             .def_value_str = "128MiB",
 117         },
 118         {
 119             .name = PARALLELS_OPT_PREALLOC_MODE,
 120             .type = QEMU_OPT_STRING,
 121             .help = "Preallocation mode on image expansion "
 122                     "(allowed values: falloc, truncate)",
 123             .def_value_str = "falloc",
 124         },
 125         { /* end of list */ },
 126     },
 127 };
 128
 129
 130 static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx)
 131 {
 132     return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier;
 133 }
 134
 135 static uint32_t bat_entry_off(uint32_t idx)
 136 {
 137     return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx;
 138 }
 139
 140 static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num)
 141 {
 142     uint32_t index, offset;
 143
 144     index = sector_num / s->tracks;
 145     offset = sector_num % s->tracks;
 146
 147     /* not allocated */
 148     if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) {
 149         return -1;
 150     }
 151     return bat2sect(s, index) + offset;
 152 }
 153
 154 static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num,
 155         int nb_sectors)
 156 {
 157     int ret = s->tracks - sector_num % s->tracks;
 158     return MIN(nb_sectors, ret);
 159 }
 160
 161 static int64_t block_status(BDRVParallelsState *s, int64_t sector_num,
 162                             int nb_sectors, int *pnum)
 163 {
 164     int64_t start_off = -2, prev_end_off = -2;
 165
 166     *pnum = 0;
 167     while (nb_sectors > 0 || start_off == -2) {
 168         int64_t offset = seek_to_sector(s, sector_num);
 169         int to_end;
 170
 171         if (start_off == -2) {
 172             start_off = offset;
 173             prev_end_off = offset;
 174         } else if (offset != prev_end_off) {
 175             break;
 176         }
 177
 178         to_end = cluster_remainder(s, sector_num, nb_sectors);
 179         nb_sectors -= to_end;
 180         sector_num += to_end;
 181         *pnum += to_end;
 182
 183         if (offset > 0) {
 184             prev_end_off += to_end;
 185         }
 186     }
 187     return start_off;
 188 }
 189
 190 static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num,
 191                                  int nb_sectors, int *pnum)
 192 {
 193     BDRVParallelsState *s = bs->opaque;
 194     uint32_t idx, to_allocate, i;
 195     int64_t pos, space;
 196
 197     pos = block_status(s, sector_num, nb_sectors, pnum);
 198     if (pos > 0) {
 199         return pos;
 200     }
 201
 202     idx = sector_num / s->tracks;
 203     if (idx >= s->bat_size) {
 204         return -EINVAL;
 205     }
 206
 207     to_allocate = (sector_num + *pnum + s->tracks - 1) / s->tracks - idx;
 208     space = to_allocate * s->tracks;
 209     if (s->data_end + space > bdrv_getlength(bs->file->bs) >> BDRV_SECTOR_BITS) {
 210         int ret;
 211         space += s->prealloc_size;
 212         if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) {
 213             ret = bdrv_write_zeroes(bs->file->bs, s->data_end, space, 0);
 214         } else {
 215             ret = bdrv_truncate(bs->file->bs,
 216                                 (s->data_end + space) << BDRV_SECTOR_BITS);
 217         }
 218         if (ret < 0) {
 219             return ret;
 220         }
 221     }
 222
 223     for (i = 0; i < to_allocate; i++) {
 224         s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier);
 225         s->data_end += s->tracks;
 226         bitmap_set(s->bat_dirty_bmap,
 227                    bat_entry_off(idx + i) / s->bat_dirty_block, 1);
 228     }
 229
 230     return bat2sect(s, idx) + sector_num % s->tracks;
 231 }
 232
 233
 234 static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs)
 235 {
 236     BDRVParallelsState *s = bs->opaque;
 237     unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block);
 238     unsigned long bit;
 239
 240     qemu_co_mutex_lock(&s->lock);
 241
 242     bit = find_first_bit(s->bat_dirty_bmap, size);
 243     while (bit < size) {
 244         uint32_t off = bit * s->bat_dirty_block;
 245         uint32_t to_write = s->bat_dirty_block;
 246         int ret;
 247
 248         if (off + to_write > s->header_size) {
 249             to_write = s->header_size - off;
 250         }
 251         ret = bdrv_pwrite(bs->file->bs, off, (uint8_t *)s->header + off,
 252                           to_write);
 253         if (ret < 0) {
 254             qemu_co_mutex_unlock(&s->lock);
 255             return ret;
 256         }
 257         bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1);
 258     }
 259     bitmap_zero(s->bat_dirty_bmap, size);
 260
 261     qemu_co_mutex_unlock(&s->lock);
 262     return 0;
 263 }
 264
 265
 266 static int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs,
 267         int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file)
 268 {
 269     BDRVParallelsState *s = bs->opaque;
 270     int64_t offset;
 271
 272     qemu_co_mutex_lock(&s->lock);
 273     offset = block_status(s, sector_num, nb_sectors, pnum);
 274     qemu_co_mutex_unlock(&s->lock);
 275
 276     if (offset < 0) {
 277         return 0;
 278     }
 279
 280     *file = bs->file->bs;
 281     return (offset << BDRV_SECTOR_BITS) |
 282         BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
 283 }
 284
 285 static coroutine_fn int parallels_co_writev(BlockDriverState *bs,
 286         int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
 287 {
 288     BDRVParallelsState *s = bs->opaque;
 289     uint64_t bytes_done = 0;
 290     QEMUIOVector hd_qiov;
 291     int ret = 0;
 292
 293     qemu_iovec_init(&hd_qiov, qiov->niov);
 294
 295     while (nb_sectors > 0) {
 296         int64_t position;
 297         int n, nbytes;
 298
 299         qemu_co_mutex_lock(&s->lock);
 300         position = allocate_clusters(bs, sector_num, nb_sectors, &n);
 301         qemu_co_mutex_unlock(&s->lock);
 302         if (position < 0) {
 303             ret = (int)position;
 304             break;
 305         }
 306
 307         nbytes = n << BDRV_SECTOR_BITS;
 308
 309         qemu_iovec_reset(&hd_qiov);
 310         qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
 311
 312         ret = bdrv_co_writev(bs->file->bs, position, n, &hd_qiov);
 313         if (ret < 0) {
 314             break;
 315         }
 316
 317         nb_sectors -= n;
 318         sector_num += n;
 319         bytes_done += nbytes;
 320     }
 321
 322     qemu_iovec_destroy(&hd_qiov);
 323     return ret;
 324 }
 325
 326 static coroutine_fn int parallels_co_readv(BlockDriverState *bs,
 327         int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
 328 {
 329     BDRVParallelsState *s = bs->opaque;
 330     uint64_t bytes_done = 0;
 331     QEMUIOVector hd_qiov;
 332     int ret = 0;
 333
 334     qemu_iovec_init(&hd_qiov, qiov->niov);
 335
 336     while (nb_sectors > 0) {
 337         int64_t position;
 338         int n, nbytes;
 339
 340         qemu_co_mutex_lock(&s->lock);
 341         position = block_status(s, sector_num, nb_sectors, &n);
 342         qemu_co_mutex_unlock(&s->lock);
 343
 344         nbytes = n << BDRV_SECTOR_BITS;
 345
 346         if (position < 0) {
 347             qemu_iovec_memset(qiov, bytes_done, 0, nbytes);
 348         } else {
 349             qemu_iovec_reset(&hd_qiov);
 350             qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
 351
 352             ret = bdrv_co_readv(bs->file->bs, position, n, &hd_qiov);
 353             if (ret < 0) {
 354                 break;
 355             }
 356         }
 357
 358         nb_sectors -= n;
 359         sector_num += n;
 360         bytes_done += nbytes;
 361     }
 362
 363     qemu_iovec_destroy(&hd_qiov);
 364     return ret;
 365 }
 366
 367
 368 static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res,
 369                            BdrvCheckMode fix)
 370 {
 371     BDRVParallelsState *s = bs->opaque;
 372     int64_t size, prev_off, high_off;
 373     int ret;
 374     uint32_t i;
 375     bool flush_bat = false;
 376     int cluster_size = s->tracks << BDRV_SECTOR_BITS;
 377
 378     size = bdrv_getlength(bs->file->bs);
 379     if (size < 0) {
 380         res->check_errors++;
 381         return size;
 382     }
 383
 384     if (s->header_unclean) {
 385         fprintf(stderr, "%s image was not closed correctly\n",
 386                 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR");
 387         res->corruptions++;
 388         if (fix & BDRV_FIX_ERRORS) {
 389             /* parallels_close will do the job right */
 390             res->corruptions_fixed++;
 391             s->header_unclean = false;
 392         }
 393     }
 394
 395     res->bfi.total_clusters = s->bat_size;
 396     res->bfi.compressed_clusters = 0; /* compression is not supported */
 397
 398     high_off = 0;
 399     prev_off = 0;
 400     for (i = 0; i < s->bat_size; i++) {
 401         int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS;
 402         if (off == 0) {
 403             prev_off = 0;
 404             continue;
 405         }
 406
 407         /* cluster outside the image */
 408         if (off > size) {
 409             fprintf(stderr, "%s cluster %u is outside image\n",
 410                     fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i);
 411             res->corruptions++;
 412             if (fix & BDRV_FIX_ERRORS) {
 413                 prev_off = 0;
 414                 s->bat_bitmap[i] = 0;
 415                 res->corruptions_fixed++;
 416                 flush_bat = true;
 417                 continue;
 418             }
 419         }
 420
 421         res->bfi.allocated_clusters++;
 422         if (off > high_off) {
 423             high_off = off;
 424         }
 425
 426         if (prev_off != 0 && (prev_off + cluster_size) != off) {
 427             res->bfi.fragmented_clusters++;
 428         }
 429         prev_off = off;
 430     }
 431
 432     if (flush_bat) {
 433         ret = bdrv_pwrite_sync(bs->file->bs, 0, s->header, s->header_size);
 434         if (ret < 0) {
 435             res->check_errors++;
 436             return ret;
 437         }
 438     }
 439
 440     res->image_end_offset = high_off + cluster_size;
 441     if (size > res->image_end_offset) {
 442         int64_t count;
 443         count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size);
 444         fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n",
 445                 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR",
 446                 size - res->image_end_offset);
 447         res->leaks += count;
 448         if (fix & BDRV_FIX_LEAKS) {
 449             ret = bdrv_truncate(bs->file->bs, res->image_end_offset);
 450             if (ret < 0) {
 451                 res->check_errors++;
 452                 return ret;
 453             }
 454             res->leaks_fixed += count;
 455         }
 456     }
 457
 458     return 0;
 459 }
 460
 461
 462 static int parallels_create(const char *filename, QemuOpts *opts, Error **errp)
 463 {
 464     int64_t total_size, cl_size;
 465     uint8_t tmp[BDRV_SECTOR_SIZE];
 466     Error *local_err = NULL;
 467     BlockBackend *file;
 468     uint32_t bat_entries, bat_sectors;
 469     ParallelsHeader header;
 470     int ret;
 471
 472     total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
 473                           BDRV_SECTOR_SIZE);
 474     cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE,
 475                           DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE);
 476
 477     ret = bdrv_create_file(filename, opts, &local_err);
 478     if (ret < 0) {
 479         error_propagate(errp, local_err);
 480         return ret;
 481     }
 482
 483     file = blk_new_open(filename, NULL, NULL,
 484                         BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err);
 485     if (file == NULL) {
 486         error_propagate(errp, local_err);
 487         return -EIO;
 488     }
 489
 490     blk_set_allow_write_beyond_eof(file, true);
 491
 492     ret = blk_truncate(file, 0);
 493     if (ret < 0) {
 494         goto exit;
 495     }
 496
 497     bat_entries = DIV_ROUND_UP(total_size, cl_size);
 498     bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size);
 499     bat_sectors = (bat_sectors *  cl_size) >> BDRV_SECTOR_BITS;
 500
 501     memset(&header, 0, sizeof(header));
 502     memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic));
 503     header.version = cpu_to_le32(HEADER_VERSION);
 504     /* don't care much about geometry, it is not used on image level */
 505     header.heads = cpu_to_le32(16);
 506     header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE / 16 / 32);
 507     header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS);
 508     header.bat_entries = cpu_to_le32(bat_entries);
 509     header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE));
 510     header.data_off = cpu_to_le32(bat_sectors);
 511
 512     /* write all the data */
 513     memset(tmp, 0, sizeof(tmp));
 514     memcpy(tmp, &header, sizeof(header));
 515
 516     ret = blk_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE, 0);
 517     if (ret < 0) {
 518         goto exit;
 519     }
 520     ret = blk_pwrite_zeroes(file, BDRV_SECTOR_SIZE,
 521                             (bat_sectors - 1) << BDRV_SECTOR_BITS, 0);
 522     if (ret < 0) {
 523         goto exit;
 524     }
 525     ret = 0;
 526
 527 done:
 528     blk_unref(file);
 529     return ret;
 530
 531 exit:
 532     error_setg_errno(errp, -ret, "Failed to create Parallels image");
 533     goto done;
 534 }
 535
 536
 537 static int parallels_probe(const uint8_t *buf, int buf_size,
 538                            const char *filename)
 539 {
 540     const ParallelsHeader *ph = (const void *)buf;
 541
 542     if (buf_size < sizeof(ParallelsHeader)) {
 543         return 0;
 544     }
 545
 546     if ((!memcmp(ph->magic, HEADER_MAGIC, 16) ||
 547            !memcmp(ph->magic, HEADER_MAGIC2, 16)) &&
 548            (le32_to_cpu(ph->version) == HEADER_VERSION)) {
 549         return 100;
 550     }
 551
 552     return 0;
 553 }
 554
 555 static int parallels_update_header(BlockDriverState *bs)
 556 {
 557     BDRVParallelsState *s = bs->opaque;
 558     unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs),
 559                         sizeof(ParallelsHeader));
 560
 561     if (size > s->header_size) {
 562         size = s->header_size;
 563     }
 564     return bdrv_pwrite_sync(bs->file->bs, 0, s->header, size);
 565 }
 566
 567 static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
 568                           Error **errp)
 569 {
 570     BDRVParallelsState *s = bs->opaque;
 571     ParallelsHeader ph;
 572     int ret, size, i;
 573     QemuOpts *opts = NULL;
 574     Error *local_err = NULL;
 575     char *buf;
 576
 577     ret = bdrv_pread(bs->file->bs, 0, &ph, sizeof(ph));
 578     if (ret < 0) {
 579         goto fail;
 580     }
 581
 582     bs->total_sectors = le64_to_cpu(ph.nb_sectors);
 583
 584     if (le32_to_cpu(ph.version) != HEADER_VERSION) {
 585         goto fail_format;
 586     }
 587     if (!memcmp(ph.magic, HEADER_MAGIC, 16)) {
 588         s->off_multiplier = 1;
 589         bs->total_sectors = 0xffffffff & bs->total_sectors;
 590     } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) {
 591         s->off_multiplier = le32_to_cpu(ph.tracks);
 592     } else {
 593         goto fail_format;
 594     }
 595
 596     s->tracks = le32_to_cpu(ph.tracks);
 597     if (s->tracks == 0) {
 598         error_setg(errp, "Invalid image: Zero sectors per track");
 599         ret = -EINVAL;
 600         goto fail;
 601     }
 602     if (s->tracks > INT32_MAX/513) {
 603         error_setg(errp, "Invalid image: Too big cluster");
 604         ret = -EFBIG;
 605         goto fail;
 606     }
 607
 608     s->bat_size = le32_to_cpu(ph.bat_entries);
 609     if (s->bat_size > INT_MAX / sizeof(uint32_t)) {
 610         error_setg(errp, "Catalog too large");
 611         ret = -EFBIG;
 612         goto fail;
 613     }
 614
 615     size = bat_entry_off(s->bat_size);
 616     s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs));
 617     s->header = qemu_try_blockalign(bs->file->bs, s->header_size);
 618     if (s->header == NULL) {
 619         ret = -ENOMEM;
 620         goto fail;
 621     }
 622     s->data_end = le32_to_cpu(ph.data_off);
 623     if (s->data_end == 0) {
 624         s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE);
 625     }
 626     if (s->data_end < s->header_size) {
 627         /* there is not enough unused space to fit to block align between BAT
 628            and actual data. We can't avoid read-modify-write... */
 629         s->header_size = size;
 630     }
 631
 632     ret = bdrv_pread(bs->file->bs, 0, s->header, s->header_size);
 633     if (ret < 0) {
 634         goto fail;
 635     }
 636     s->bat_bitmap = (uint32_t *)(s->header + 1);
 637
 638     for (i = 0; i < s->bat_size; i++) {
 639         int64_t off = bat2sect(s, i);
 640         if (off >= s->data_end) {
 641             s->data_end = off + s->tracks;
 642         }
 643     }
 644
 645     if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) {
 646         /* Image was not closed correctly. The check is mandatory */
 647         s->header_unclean = true;
 648         if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) {
 649             error_setg(errp, "parallels: Image was not closed correctly; "
 650                        "cannot be opened read/write");
 651             ret = -EACCES;
 652             goto fail;
 653         }
 654     }
 655
 656     opts = qemu_opts_create(&parallels_runtime_opts, NULL, 0, &local_err);
 657     if (local_err != NULL) {
 658         goto fail_options;
 659     }
 660
 661     qemu_opts_absorb_qdict(opts, options, &local_err);
 662     if (local_err != NULL) {
 663         goto fail_options;
 664     }
 665
 666     s->prealloc_size =
 667         qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0);
 668     s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS);
 669     buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE);
 670     s->prealloc_mode = qapi_enum_parse(prealloc_mode_lookup, buf,
 671             PRL_PREALLOC_MODE__MAX, PRL_PREALLOC_MODE_FALLOCATE, &local_err);
 672     g_free(buf);
 673     if (local_err != NULL) {
 674         goto fail_options;
 675     }
 676     if (!bdrv_has_zero_init(bs->file->bs) ||
 677             bdrv_truncate(bs->file->bs, bdrv_getlength(bs->file->bs)) != 0) {
 678         s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE;
 679     }
 680
 681     if (flags & BDRV_O_RDWR) {
 682         s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC);
 683         ret = parallels_update_header(bs);
 684         if (ret < 0) {
 685             goto fail;
 686         }
 687     }
 688
 689     s->bat_dirty_block = 4 * getpagesize();
 690     s->bat_dirty_bmap =
 691         bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block));
 692
 693     qemu_co_mutex_init(&s->lock);
 694     return 0;
 695
 696 fail_format:
 697     error_setg(errp, "Image not in Parallels format");
 698     ret = -EINVAL;
 699 fail:
 700     qemu_vfree(s->header);
 701     return ret;
 702
 703 fail_options:
 704     error_propagate(errp, local_err);
 705     ret = -EINVAL;
 706     goto fail;
 707 }
 708
 709
 710 static void parallels_close(BlockDriverState *bs)
 711 {
 712     BDRVParallelsState *s = bs->opaque;
 713
 714     if (bs->open_flags & BDRV_O_RDWR) {
 715         s->header->inuse = 0;
 716         parallels_update_header(bs);
 717     }
 718
 719     if (bs->open_flags & BDRV_O_RDWR) {
 720         bdrv_truncate(bs->file->bs, s->data_end << BDRV_SECTOR_BITS);
 721     }
 722
 723     g_free(s->bat_dirty_bmap);
 724     qemu_vfree(s->header);
 725 }
 726
 727 static QemuOptsList parallels_create_opts = {
 728     .name = "parallels-create-opts",
 729     .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head),
 730     .desc = {
 731         {
 732             .name = BLOCK_OPT_SIZE,
 733             .type = QEMU_OPT_SIZE,
 734             .help = "Virtual disk size",
 735         },
 736         {
 737             .name = BLOCK_OPT_CLUSTER_SIZE,
 738             .type = QEMU_OPT_SIZE,
 739             .help = "Parallels image cluster size",
 740             .def_value_str = stringify(DEFAULT_CLUSTER_SIZE),
 741         },
 742         { /* end of list */ }
 743     }
 744 };
 745
 746 static BlockDriver bdrv_parallels = {
 747     .format_name        = "parallels",
 748     .instance_size      = sizeof(BDRVParallelsState),
 749     .bdrv_probe         = parallels_probe,
 750     .bdrv_open          = parallels_open,
 751     .bdrv_close         = parallels_close,
 752     .bdrv_co_get_block_status = parallels_co_get_block_status,
 753     .bdrv_has_zero_init       = bdrv_has_zero_init_1,
 754     .bdrv_co_flush_to_os      = parallels_co_flush_to_os,
 755     .bdrv_co_readv  = parallels_co_readv,
 756     .bdrv_co_writev = parallels_co_writev,
 757
 758     .bdrv_create    = parallels_create,
 759     .bdrv_check     = parallels_check,
 760     .create_opts    = &parallels_create_opts,
 761 };
 762
 763 static void bdrv_parallels_init(void)
 764 {
 765     bdrv_register(&bdrv_parallels);
 766 }
 767
 768 block_init(bdrv_parallels_init);