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 = DIV_ROUND_UP(sector_num + *pnum, 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_pwrite_zeroes(bs->file,
 214                                      s->data_end << BDRV_SECTOR_BITS,
 215                                      space << BDRV_SECTOR_BITS, 0);
 216         } else {
 217             ret = bdrv_truncate(bs->file->bs,
 218                                 (s->data_end + space) << BDRV_SECTOR_BITS);
 219         }
 220         if (ret < 0) {
 221             return ret;
 222         }
 223     }
 224
 225     for (i = 0; i < to_allocate; i++) {
 226         s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier);
 227         s->data_end += s->tracks;
 228         bitmap_set(s->bat_dirty_bmap,
 229                    bat_entry_off(idx + i) / s->bat_dirty_block, 1);
 230     }
 231
 232     return bat2sect(s, idx) + sector_num % s->tracks;
 233 }
 234
 235
 236 static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs)
 237 {
 238     BDRVParallelsState *s = bs->opaque;
 239     unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block);
 240     unsigned long bit;
 241
 242     qemu_co_mutex_lock(&s->lock);
 243
 244     bit = find_first_bit(s->bat_dirty_bmap, size);
 245     while (bit < size) {
 246         uint32_t off = bit * s->bat_dirty_block;
 247         uint32_t to_write = s->bat_dirty_block;
 248         int ret;
 249
 250         if (off + to_write > s->header_size) {
 251             to_write = s->header_size - off;
 252         }
 253         ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off,
 254                           to_write);
 255         if (ret < 0) {
 256             qemu_co_mutex_unlock(&s->lock);
 257             return ret;
 258         }
 259         bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1);
 260     }
 261     bitmap_zero(s->bat_dirty_bmap, size);
 262
 263     qemu_co_mutex_unlock(&s->lock);
 264     return 0;
 265 }
 266
 267
 268 static int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs,
 269         int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file)
 270 {
 271     BDRVParallelsState *s = bs->opaque;
 272     int64_t offset;
 273
 274     qemu_co_mutex_lock(&s->lock);
 275     offset = block_status(s, sector_num, nb_sectors, pnum);
 276     qemu_co_mutex_unlock(&s->lock);
 277
 278     if (offset < 0) {
 279         return 0;
 280     }
 281
 282     *file = bs->file->bs;
 283     return (offset << BDRV_SECTOR_BITS) |
 284         BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
 285 }
 286
 287 static coroutine_fn int parallels_co_writev(BlockDriverState *bs,
 288         int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
 289 {
 290     BDRVParallelsState *s = bs->opaque;
 291     uint64_t bytes_done = 0;
 292     QEMUIOVector hd_qiov;
 293     int ret = 0;
 294
 295     qemu_iovec_init(&hd_qiov, qiov->niov);
 296
 297     while (nb_sectors > 0) {
 298         int64_t position;
 299         int n, nbytes;
 300
 301         qemu_co_mutex_lock(&s->lock);
 302         position = allocate_clusters(bs, sector_num, nb_sectors, &n);
 303         qemu_co_mutex_unlock(&s->lock);
 304         if (position < 0) {
 305             ret = (int)position;
 306             break;
 307         }
 308
 309         nbytes = n << BDRV_SECTOR_BITS;
 310
 311         qemu_iovec_reset(&hd_qiov);
 312         qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
 313
 314         ret = bdrv_co_writev(bs->file, position, n, &hd_qiov);
 315         if (ret < 0) {
 316             break;
 317         }
 318
 319         nb_sectors -= n;
 320         sector_num += n;
 321         bytes_done += nbytes;
 322     }
 323
 324     qemu_iovec_destroy(&hd_qiov);
 325     return ret;
 326 }
 327
 328 static coroutine_fn int parallels_co_readv(BlockDriverState *bs,
 329         int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
 330 {
 331     BDRVParallelsState *s = bs->opaque;
 332     uint64_t bytes_done = 0;
 333     QEMUIOVector hd_qiov;
 334     int ret = 0;
 335
 336     qemu_iovec_init(&hd_qiov, qiov->niov);
 337
 338     while (nb_sectors > 0) {
 339         int64_t position;
 340         int n, nbytes;
 341
 342         qemu_co_mutex_lock(&s->lock);
 343         position = block_status(s, sector_num, nb_sectors, &n);
 344         qemu_co_mutex_unlock(&s->lock);
 345
 346         nbytes = n << BDRV_SECTOR_BITS;
 347
 348         if (position < 0) {
 349             qemu_iovec_memset(qiov, bytes_done, 0, nbytes);
 350         } else {
 351             qemu_iovec_reset(&hd_qiov);
 352             qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
 353
 354             ret = bdrv_co_readv(bs->file, position, n, &hd_qiov);
 355             if (ret < 0) {
 356                 break;
 357             }
 358         }
 359
 360         nb_sectors -= n;
 361         sector_num += n;
 362         bytes_done += nbytes;
 363     }
 364
 365     qemu_iovec_destroy(&hd_qiov);
 366     return ret;
 367 }
 368
 369
 370 static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res,
 371                            BdrvCheckMode fix)
 372 {
 373     BDRVParallelsState *s = bs->opaque;
 374     int64_t size, prev_off, high_off;
 375     int ret;
 376     uint32_t i;
 377     bool flush_bat = false;
 378     int cluster_size = s->tracks << BDRV_SECTOR_BITS;
 379
 380     size = bdrv_getlength(bs->file->bs);
 381     if (size < 0) {
 382         res->check_errors++;
 383         return size;
 384     }
 385
 386     if (s->header_unclean) {
 387         fprintf(stderr, "%s image was not closed correctly\n",
 388                 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR");
 389         res->corruptions++;
 390         if (fix & BDRV_FIX_ERRORS) {
 391             /* parallels_close will do the job right */
 392             res->corruptions_fixed++;
 393             s->header_unclean = false;
 394         }
 395     }
 396
 397     res->bfi.total_clusters = s->bat_size;
 398     res->bfi.compressed_clusters = 0; /* compression is not supported */
 399
 400     high_off = 0;
 401     prev_off = 0;
 402     for (i = 0; i < s->bat_size; i++) {
 403         int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS;
 404         if (off == 0) {
 405             prev_off = 0;
 406             continue;
 407         }
 408
 409         /* cluster outside the image */
 410         if (off > size) {
 411             fprintf(stderr, "%s cluster %u is outside image\n",
 412                     fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i);
 413             res->corruptions++;
 414             if (fix & BDRV_FIX_ERRORS) {
 415                 prev_off = 0;
 416                 s->bat_bitmap[i] = 0;
 417                 res->corruptions_fixed++;
 418                 flush_bat = true;
 419                 continue;
 420             }
 421         }
 422
 423         res->bfi.allocated_clusters++;
 424         if (off > high_off) {
 425             high_off = off;
 426         }
 427
 428         if (prev_off != 0 && (prev_off + cluster_size) != off) {
 429             res->bfi.fragmented_clusters++;
 430         }
 431         prev_off = off;
 432     }
 433
 434     if (flush_bat) {
 435         ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size);
 436         if (ret < 0) {
 437             res->check_errors++;
 438             return ret;
 439         }
 440     }
 441
 442     res->image_end_offset = high_off + cluster_size;
 443     if (size > res->image_end_offset) {
 444         int64_t count;
 445         count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size);
 446         fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n",
 447                 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR",
 448                 size - res->image_end_offset);
 449         res->leaks += count;
 450         if (fix & BDRV_FIX_LEAKS) {
 451             ret = bdrv_truncate(bs->file->bs, res->image_end_offset);
 452             if (ret < 0) {
 453                 res->check_errors++;
 454                 return ret;
 455             }
 456             res->leaks_fixed += count;
 457         }
 458     }
 459
 460     return 0;
 461 }
 462
 463
 464 static int parallels_create(const char *filename, QemuOpts *opts, Error **errp)
 465 {
 466     int64_t total_size, cl_size;
 467     uint8_t tmp[BDRV_SECTOR_SIZE];
 468     Error *local_err = NULL;
 469     BlockBackend *file;
 470     uint32_t bat_entries, bat_sectors;
 471     ParallelsHeader header;
 472     int ret;
 473
 474     total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
 475                           BDRV_SECTOR_SIZE);
 476     cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE,
 477                           DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE);
 478
 479     ret = bdrv_create_file(filename, opts, &local_err);
 480     if (ret < 0) {
 481         error_propagate(errp, local_err);
 482         return ret;
 483     }
 484
 485     file = blk_new_open(filename, NULL, NULL,
 486                         BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err);
 487     if (file == NULL) {
 488         error_propagate(errp, local_err);
 489         return -EIO;
 490     }
 491
 492     blk_set_allow_write_beyond_eof(file, true);
 493
 494     ret = blk_truncate(file, 0);
 495     if (ret < 0) {
 496         goto exit;
 497     }
 498
 499     bat_entries = DIV_ROUND_UP(total_size, cl_size);
 500     bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size);
 501     bat_sectors = (bat_sectors *  cl_size) >> BDRV_SECTOR_BITS;
 502
 503     memset(&header, 0, sizeof(header));
 504     memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic));
 505     header.version = cpu_to_le32(HEADER_VERSION);
 506     /* don't care much about geometry, it is not used on image level */
 507     header.heads = cpu_to_le32(16);
 508     header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE / 16 / 32);
 509     header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS);
 510     header.bat_entries = cpu_to_le32(bat_entries);
 511     header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE));
 512     header.data_off = cpu_to_le32(bat_sectors);
 513
 514     /* write all the data */
 515     memset(tmp, 0, sizeof(tmp));
 516     memcpy(tmp, &header, sizeof(header));
 517
 518     ret = blk_pwrite(file, 0, tmp, BDRV_SECTOR_SIZE, 0);
 519     if (ret < 0) {
 520         goto exit;
 521     }
 522     ret = blk_pwrite_zeroes(file, BDRV_SECTOR_SIZE,
 523                             (bat_sectors - 1) << BDRV_SECTOR_BITS, 0);
 524     if (ret < 0) {
 525         goto exit;
 526     }
 527     ret = 0;
 528
 529 done:
 530     blk_unref(file);
 531     return ret;
 532
 533 exit:
 534     error_setg_errno(errp, -ret, "Failed to create Parallels image");
 535     goto done;
 536 }
 537
 538
 539 static int parallels_probe(const uint8_t *buf, int buf_size,
 540                            const char *filename)
 541 {
 542     const ParallelsHeader *ph = (const void *)buf;
 543
 544     if (buf_size < sizeof(ParallelsHeader)) {
 545         return 0;
 546     }
 547
 548     if ((!memcmp(ph->magic, HEADER_MAGIC, 16) ||
 549            !memcmp(ph->magic, HEADER_MAGIC2, 16)) &&
 550            (le32_to_cpu(ph->version) == HEADER_VERSION)) {
 551         return 100;
 552     }
 553
 554     return 0;
 555 }
 556
 557 static int parallels_update_header(BlockDriverState *bs)
 558 {
 559     BDRVParallelsState *s = bs->opaque;
 560     unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs),
 561                         sizeof(ParallelsHeader));
 562
 563     if (size > s->header_size) {
 564         size = s->header_size;
 565     }
 566     return bdrv_pwrite_sync(bs->file, 0, s->header, size);
 567 }
 568
 569 static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
 570                           Error **errp)
 571 {
 572     BDRVParallelsState *s = bs->opaque;
 573     ParallelsHeader ph;
 574     int ret, size, i;
 575     QemuOpts *opts = NULL;
 576     Error *local_err = NULL;
 577     char *buf;
 578
 579     ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph));
 580     if (ret < 0) {
 581         goto fail;
 582     }
 583
 584     bs->total_sectors = le64_to_cpu(ph.nb_sectors);
 585
 586     if (le32_to_cpu(ph.version) != HEADER_VERSION) {
 587         goto fail_format;
 588     }
 589     if (!memcmp(ph.magic, HEADER_MAGIC, 16)) {
 590         s->off_multiplier = 1;
 591         bs->total_sectors = 0xffffffff & bs->total_sectors;
 592     } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) {
 593         s->off_multiplier = le32_to_cpu(ph.tracks);
 594     } else {
 595         goto fail_format;
 596     }
 597
 598     s->tracks = le32_to_cpu(ph.tracks);
 599     if (s->tracks == 0) {
 600         error_setg(errp, "Invalid image: Zero sectors per track");
 601         ret = -EINVAL;
 602         goto fail;
 603     }
 604     if (s->tracks > INT32_MAX/513) {
 605         error_setg(errp, "Invalid image: Too big cluster");
 606         ret = -EFBIG;
 607         goto fail;
 608     }
 609
 610     s->bat_size = le32_to_cpu(ph.bat_entries);
 611     if (s->bat_size > INT_MAX / sizeof(uint32_t)) {
 612         error_setg(errp, "Catalog too large");
 613         ret = -EFBIG;
 614         goto fail;
 615     }
 616
 617     size = bat_entry_off(s->bat_size);
 618     s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs));
 619     s->header = qemu_try_blockalign(bs->file->bs, s->header_size);
 620     if (s->header == NULL) {
 621         ret = -ENOMEM;
 622         goto fail;
 623     }
 624     s->data_end = le32_to_cpu(ph.data_off);
 625     if (s->data_end == 0) {
 626         s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE);
 627     }
 628     if (s->data_end < s->header_size) {
 629         /* there is not enough unused space to fit to block align between BAT
 630            and actual data. We can't avoid read-modify-write... */
 631         s->header_size = size;
 632     }
 633
 634     ret = bdrv_pread(bs->file, 0, s->header, s->header_size);
 635     if (ret < 0) {
 636         goto fail;
 637     }
 638     s->bat_bitmap = (uint32_t *)(s->header + 1);
 639
 640     for (i = 0; i < s->bat_size; i++) {
 641         int64_t off = bat2sect(s, i);
 642         if (off >= s->data_end) {
 643             s->data_end = off + s->tracks;
 644         }
 645     }
 646
 647     if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) {
 648         /* Image was not closed correctly. The check is mandatory */
 649         s->header_unclean = true;
 650         if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) {
 651             error_setg(errp, "parallels: Image was not closed correctly; "
 652                        "cannot be opened read/write");
 653             ret = -EACCES;
 654             goto fail;
 655         }
 656     }
 657
 658     opts = qemu_opts_create(&parallels_runtime_opts, NULL, 0, &local_err);
 659     if (local_err != NULL) {
 660         goto fail_options;
 661     }
 662
 663     qemu_opts_absorb_qdict(opts, options, &local_err);
 664     if (local_err != NULL) {
 665         goto fail_options;
 666     }
 667
 668     s->prealloc_size =
 669         qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0);
 670     s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS);
 671     buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE);
 672     s->prealloc_mode = qapi_enum_parse(prealloc_mode_lookup, buf,
 673             PRL_PREALLOC_MODE__MAX, PRL_PREALLOC_MODE_FALLOCATE, &local_err);
 674     g_free(buf);
 675     if (local_err != NULL) {
 676         goto fail_options;
 677     }
 678     if (!bdrv_has_zero_init(bs->file->bs) ||
 679             bdrv_truncate(bs->file->bs, bdrv_getlength(bs->file->bs)) != 0) {
 680         s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE;
 681     }
 682
 683     if (flags & BDRV_O_RDWR) {
 684         s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC);
 685         ret = parallels_update_header(bs);
 686         if (ret < 0) {
 687             goto fail;
 688         }
 689     }
 690
 691     s->bat_dirty_block = 4 * getpagesize();
 692     s->bat_dirty_bmap =
 693         bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block));
 694
 695     qemu_co_mutex_init(&s->lock);
 696     return 0;
 697
 698 fail_format:
 699     error_setg(errp, "Image not in Parallels format");
 700     ret = -EINVAL;
 701 fail:
 702     qemu_vfree(s->header);
 703     return ret;
 704
 705 fail_options:
 706     error_propagate(errp, local_err);
 707     ret = -EINVAL;
 708     goto fail;
 709 }
 710
 711
 712 static void parallels_close(BlockDriverState *bs)
 713 {
 714     BDRVParallelsState *s = bs->opaque;
 715
 716     if (bs->open_flags & BDRV_O_RDWR) {
 717         s->header->inuse = 0;
 718         parallels_update_header(bs);
 719     }
 720
 721     if (bs->open_flags & BDRV_O_RDWR) {
 722         bdrv_truncate(bs->file->bs, s->data_end << BDRV_SECTOR_BITS);
 723     }
 724
 725     g_free(s->bat_dirty_bmap);
 726     qemu_vfree(s->header);
 727 }
 728
 729 static QemuOptsList parallels_create_opts = {
 730     .name = "parallels-create-opts",
 731     .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head),
 732     .desc = {
 733         {
 734             .name = BLOCK_OPT_SIZE,
 735             .type = QEMU_OPT_SIZE,
 736             .help = "Virtual disk size",
 737         },
 738         {
 739             .name = BLOCK_OPT_CLUSTER_SIZE,
 740             .type = QEMU_OPT_SIZE,
 741             .help = "Parallels image cluster size",
 742             .def_value_str = stringify(DEFAULT_CLUSTER_SIZE),
 743         },
 744         { /* end of list */ }
 745     }
 746 };
 747
 748 static BlockDriver bdrv_parallels = {
 749     .format_name        = "parallels",
 750     .instance_size      = sizeof(BDRVParallelsState),
 751     .bdrv_probe         = parallels_probe,
 752     .bdrv_open          = parallels_open,
 753     .bdrv_close         = parallels_close,
 754     .bdrv_co_get_block_status = parallels_co_get_block_status,
 755     .bdrv_has_zero_init       = bdrv_has_zero_init_1,
 756     .bdrv_co_flush_to_os      = parallels_co_flush_to_os,
 757     .bdrv_co_readv  = parallels_co_readv,
 758     .bdrv_co_writev = parallels_co_writev,
 759
 760     .bdrv_create    = parallels_create,
 761     .bdrv_check     = parallels_check,
 762     .create_opts    = &parallels_create_opts,
 763 };
 764
 765 static void bdrv_parallels_init(void)
 766 {
 767     bdrv_register(&bdrv_parallels);
 768 }
 769
 770 block_init(bdrv_parallels_init);