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