block/parallels.c

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