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