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