block/parallels.c

   1 /*
   2  * Block driver for Parallels disk image format
   3  *
   4  * Copyright (c) 2007 Alex Beregszaszi
   5  * Copyright (c) 2015 Denis V. Lunev <den@openvz.org>
   6  *
   7  * This code was originally based on comparing different disk images created
   8  * by Parallels. Currently it is based on opened OpenVZ sources
   9  * available at
  10  *     http://git.openvz.org/?p=ploop;a=summary
  11  *
  12  * Permission is hereby granted, free of charge, to any person obtaining a copy
  13  * of this software and associated documentation files (the "Software"), to deal
  14  * in the Software without restriction, including without limitation the rights
  15  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  16  * copies of the Software, and to permit persons to whom the Software is
  17  * furnished to do so, subject to the following conditions:
  18  *
  19  * The above copyright notice and this permission notice shall be included in
  20  * all copies or substantial portions of the Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  25  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  26  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  27  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  28  * THE SOFTWARE.
  29  */
  30 #include "qemu/osdep.h"
  31 #include "qapi/error.h"
  32 #include "qemu-common.h"
  33 #include "block/block_int.h"
  34 #include "sysemu/block-backend.h"
  35 #include "qemu/module.h"
  36 #include "qemu/bitmap.h"
  37 #include "qapi/util.h"
  38
  39 /**************************************************************/
  40
  41 #define HEADER_MAGIC "WithoutFreeSpace"
  42 #define HEADER_MAGIC2 "WithouFreSpacExt"
  43 #define HEADER_VERSION 2
  44 #define HEADER_INUSE_MAGIC  (0x746F6E59)
  45
  46 #define DEFAULT_CLUSTER_SIZE 1048576        /* 1 MiB */
  47
  48
  49 // always little-endian
  50 typedef struct ParallelsHeader {
  51     char magic[16]; // "WithoutFreeSpace"
  52     uint32_t version;
  53     uint32_t heads;
  54     uint32_t cylinders;
  55     uint32_t tracks;
  56     uint32_t bat_entries;
  57     uint64_t nb_sectors;
  58     uint32_t inuse;
  59     uint32_t data_off;
  60     char padding[12];
  61 } QEMU_PACKED ParallelsHeader;
  62
  63
  64 typedef enum ParallelsPreallocMode {
  65     PRL_PREALLOC_MODE_FALLOCATE = 0,
  66     PRL_PREALLOC_MODE_TRUNCATE = 1,
  67     PRL_PREALLOC_MODE__MAX = 2,
  68 } ParallelsPreallocMode;
  69
  70 static const char *prealloc_mode_lookup[] = {
  71     "falloc",
  72     "truncate",
  73     NULL,
  74 };
  75
  76
  77 typedef struct BDRVParallelsState {
  78     /** Locking is conservative, the lock protects
  79      *   - image file extending (truncate, fallocate)
  80      *   - any access to block allocation table
  81      */
  82     CoMutex lock;
  83
  84     ParallelsHeader *header;
  85     uint32_t header_size;
  86     bool header_unclean;
  87
  88     unsigned long *bat_dirty_bmap;
  89     unsigned int  bat_dirty_block;
  90
  91     uint32_t *bat_bitmap;
  92     unsigned int bat_size;
  93
  94     int64_t  data_end;
  95     uint64_t prealloc_size;
  96     ParallelsPreallocMode prealloc_mode;
  97
  98     unsigned int tracks;
  99
 100     unsigned int off_multiplier;
 101 } BDRVParallelsState;
 102
 103
 104 #define PARALLELS_OPT_PREALLOC_MODE     "prealloc-mode"
 105 #define PARALLELS_OPT_PREALLOC_SIZE     "prealloc-size"
 106
 107 static QemuOptsList parallels_runtime_opts = {
 108     .name = "parallels",
 109     .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head),
 110     .desc = {
 111         {
 112             .name = PARALLELS_OPT_PREALLOC_SIZE,
 113             .type = QEMU_OPT_SIZE,
 114             .help = "Preallocation size on image expansion",
 115             .def_value_str = "128MiB",
 116         },
 117         {
 118             .name = PARALLELS_OPT_PREALLOC_MODE,
 119             .type = QEMU_OPT_STRING,
 120             .help = "Preallocation mode on image expansion "
 121                     "(allowed values: falloc, truncate)",
 122             .def_value_str = "falloc",
 123         },
 124         { /* end of list */ },
 125     },
 126 };
 127
 128
 129 static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx)
 130 {
 131     return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier;
 132 }
 133
 134 static uint32_t bat_entry_off(uint32_t idx)
 135 {
 136     return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx;
 137 }
 138
 139 static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num)
 140 {
 141     uint32_t index, offset;
 142
 143     index = sector_num / s->tracks;
 144     offset = sector_num % s->tracks;
 145
 146     /* not allocated */
 147     if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) {
 148         return -1;
 149     }
 150     return bat2sect(s, index) + offset;
 151 }
 152
 153 static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num,
 154         int nb_sectors)
 155 {
 156     int ret = s->tracks - sector_num % s->tracks;
 157     return MIN(nb_sectors, ret);
 158 }
 159
 160 static int64_t block_status(BDRVParallelsState *s, int64_t sector_num,
 161                             int nb_sectors, int *pnum)
 162 {
 163     int64_t start_off = -2, prev_end_off = -2;
 164
 165     *pnum = 0;
 166     while (nb_sectors > 0 || start_off == -2) {
 167         int64_t offset = seek_to_sector(s, sector_num);
 168         int to_end;
 169
 170         if (start_off == -2) {
 171             start_off = offset;
 172             prev_end_off = offset;
 173         } else if (offset != prev_end_off) {
 174             break;
 175         }
 176
 177         to_end = cluster_remainder(s, sector_num, nb_sectors);
 178         nb_sectors -= to_end;
 179         sector_num += to_end;
 180         *pnum += to_end;
 181
 182         if (offset > 0) {
 183             prev_end_off += to_end;
 184         }
 185     }
 186     return start_off;
 187 }
 188
 189 static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num,
 190                                  int nb_sectors, int *pnum)
 191 {
 192     BDRVParallelsState *s = bs->opaque;
 193     uint32_t idx, to_allocate, i;
 194     int64_t pos, space;
 195
 196     pos = block_status(s, sector_num, nb_sectors, pnum);
 197     if (pos > 0) {
 198         return pos;
 199     }
 200
 201     idx = sector_num / s->tracks;
 202     if (idx >= s->bat_size) {
 203         return -EINVAL;
 204     }
 205
 206     to_allocate = (sector_num + *pnum + s->tracks - 1) / s->tracks - idx;
 207     space = to_allocate * s->tracks;
 208     if (s->data_end + space > bdrv_getlength(bs->file->bs) >> BDRV_SECTOR_BITS) {
 209         int ret;
 210         space += s->prealloc_size;
 211         if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) {
 212             ret = bdrv_write_zeroes(bs->file->bs, s->data_end, space, 0);
 213         } else {
 214             ret = bdrv_truncate(bs->file->bs,
 215                                 (s->data_end + space) << BDRV_SECTOR_BITS);
 216         }
 217         if (ret < 0) {
 218             return ret;
 219         }
 220     }
 221
 222     for (i = 0; i < to_allocate; i++) {
 223         s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier);
 224         s->data_end += s->tracks;
 225         bitmap_set(s->bat_dirty_bmap,
 226                    bat_entry_off(idx + i) / s->bat_dirty_block, 1);
 227     }
 228
 229     return bat2sect(s, idx) + sector_num % s->tracks;
 230 }
 231
 232
 233 static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs)
 234 {
 235     BDRVParallelsState *s = bs->opaque;
 236     unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block);
 237     unsigned long bit;
 238
 239     qemu_co_mutex_lock(&s->lock);
 240
 241     bit = find_first_bit(s->bat_dirty_bmap, size);
 242     while (bit < size) {
 243         uint32_t off = bit * s->bat_dirty_block;
 244         uint32_t to_write = s->bat_dirty_block;
 245         int ret;
 246
 247         if (off + to_write > s->header_size) {
 248             to_write = s->header_size - off;
 249         }
 250         ret = bdrv_pwrite(bs->file->bs, off, (uint8_t *)s->header + off,
 251                           to_write);
 252         if (ret < 0) {
 253             qemu_co_mutex_unlock(&s->lock);
 254             return ret;
 255         }
 256         bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1);
 257     }
 258     bitmap_zero(s->bat_dirty_bmap, size);
 259
 260     qemu_co_mutex_unlock(&s->lock);
 261     return 0;
 262 }
 263
 264
 265 static int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs,
 266         int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file)
 267 {
 268     BDRVParallelsState *s = bs->opaque;
 269     int64_t offset;
 270
 271     qemu_co_mutex_lock(&s->lock);
 272     offset = block_status(s, sector_num, nb_sectors, pnum);
 273     qemu_co_mutex_unlock(&s->lock);
 274
 275     if (offset < 0) {
 276         return 0;
 277     }
 278
 279     *file = bs->file->bs;
 280     return (offset << BDRV_SECTOR_BITS) |
 281         BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
 282 }
 283
 284 static coroutine_fn int parallels_co_writev(BlockDriverState *bs,
 285         int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
 286 {
 287     BDRVParallelsState *s = bs->opaque;
 288     uint64_t bytes_done = 0;
 289     QEMUIOVector hd_qiov;
 290     int ret = 0;
 291
 292     qemu_iovec_init(&hd_qiov, qiov->niov);
 293
 294     while (nb_sectors > 0) {
 295         int64_t position;
 296         int n, nbytes;
 297
 298         qemu_co_mutex_lock(&s->lock);
 299         position = allocate_clusters(bs, sector_num, nb_sectors, &n);
 300         qemu_co_mutex_unlock(&s->lock);
 301         if (position < 0) {
 302             ret = (int)position;
 303             break;
 304         }
 305
 306         nbytes = n << BDRV_SECTOR_BITS;
 307
 308         qemu_iovec_reset(&hd_qiov);
 309         qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
 310
 311         ret = bdrv_co_writev(bs->file->bs, position, n, &hd_qiov);
 312         if (ret < 0) {
 313             break;
 314         }
 315
 316         nb_sectors -= n;
 317         sector_num += n;
 318         bytes_done += nbytes;
 319     }
 320
 321     qemu_iovec_destroy(&hd_qiov);
 322     return ret;
 323 }
 324
 325 static coroutine_fn int parallels_co_readv(BlockDriverState *bs,
 326         int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
 327 {
 328     BDRVParallelsState *s = bs->opaque;
 329     uint64_t bytes_done = 0;
 330     QEMUIOVector hd_qiov;
 331     int ret = 0;
 332
 333     qemu_iovec_init(&hd_qiov, qiov->niov);
 334
 335     while (nb_sectors > 0) {
 336         int64_t position;
 337         int n, nbytes;
 338
 339         qemu_co_mutex_lock(&s->lock);
 340         position = block_status(s, sector_num, nb_sectors, &n);
 341         qemu_co_mutex_unlock(&s->lock);
 342
 343         nbytes = n << BDRV_SECTOR_BITS;
 344
 345         if (position < 0) {
 346             qemu_iovec_memset(qiov, bytes_done, 0, nbytes);
 347         } else {
 348             qemu_iovec_reset(&hd_qiov);
 349             qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
 350
 351             ret = bdrv_co_readv(bs->file->bs, position, n, &hd_qiov);
 352             if (ret < 0) {
 353                 break;
 354             }
 355         }
 356
 357         nb_sectors -= n;
 358         sector_num += n;
 359         bytes_done += nbytes;
 360     }
 361
 362     qemu_iovec_destroy(&hd_qiov);
 363     return ret;
 364 }
 365
 366
 367 static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res,
 368                            BdrvCheckMode fix)
 369 {
 370     BDRVParallelsState *s = bs->opaque;
 371     int64_t size, prev_off, high_off;
 372     int ret;
 373     uint32_t i;
 374     bool flush_bat = false;
 375     int cluster_size = s->tracks << BDRV_SECTOR_BITS;
 376
 377     size = bdrv_getlength(bs->file->bs);
 378     if (size < 0) {
 379         res->check_errors++;
 380         return size;
 381     }
 382
 383     if (s->header_unclean) {
 384         fprintf(stderr, "%s image was not closed correctly\n",
 385                 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR");
 386         res->corruptions++;
 387         if (fix & BDRV_FIX_ERRORS) {
 388             /* parallels_close will do the job right */
 389             res->corruptions_fixed++;
 390             s->header_unclean = false;
 391         }
 392     }
 393
 394     res->bfi.total_clusters = s->bat_size;
 395     res->bfi.compressed_clusters = 0; /* compression is not supported */
 396
 397     high_off = 0;
 398     prev_off = 0;
 399     for (i = 0; i < s->bat_size; i++) {
 400         int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS;
 401         if (off == 0) {
 402             prev_off = 0;
 403             continue;
 404         }
 405
 406         /* cluster outside the image */
 407         if (off > size) {
 408             fprintf(stderr, "%s cluster %u is outside image\n",
 409                     fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i);
 410             res->corruptions++;
 411             if (fix & BDRV_FIX_ERRORS) {
 412                 prev_off = 0;
 413                 s->bat_bitmap[i] = 0;
 414                 res->corruptions_fixed++;
 415                 flush_bat = true;
 416                 continue;
 417             }
 418         }
 419
 420         res->bfi.allocated_clusters++;
 421         if (off > high_off) {
 422             high_off = off;
 423         }
 424
 425         if (prev_off != 0 && (prev_off + cluster_size) != off) {
 426             res->bfi.fragmented_clusters++;
 427         }
 428         prev_off = off;
 429     }
 430
 431     if (flush_bat) {
 432         ret = bdrv_pwrite_sync(bs->file->bs, 0, s->header, s->header_size);
 433         if (ret < 0) {
 434             res->check_errors++;
 435             return ret;
 436         }
 437     }
 438
 439     res->image_end_offset = high_off + cluster_size;
 440     if (size > res->image_end_offset) {
 441         int64_t count;
 442         count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size);
 443         fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n",
 444                 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR",
 445                 size - res->image_end_offset);
 446         res->leaks += count;
 447         if (fix & BDRV_FIX_LEAKS) {
 448             ret = bdrv_truncate(bs->file->bs, res->image_end_offset);
 449             if (ret < 0) {
 450                 res->check_errors++;
 451                 return ret;
 452             }
 453             res->leaks_fixed += count;
 454         }
 455     }
 456
 457     return 0;
 458 }
 459
 460
 461 static int parallels_create(const char *filename, QemuOpts *opts, Error **errp)
 462 {
 463     int64_t total_size, cl_size;
 464     uint8_t tmp[BDRV_SECTOR_SIZE];
 465     Error *local_err = NULL;
 466     BlockBackend *file;
 467     uint32_t bat_entries, bat_sectors;
 468     ParallelsHeader header;
 469     int ret;
 470
 471     total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
 472                           BDRV_SECTOR_SIZE);
 473     cl_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE,
 474                           DEFAULT_CLUSTER_SIZE), BDRV_SECTOR_SIZE);
 475
 476     ret = bdrv_create_file(filename, opts, &local_err);
 477     if (ret < 0) {
 478         error_propagate(errp, local_err);
 479         return ret;
 480     }
 481
 482     file = blk_new_open(filename, NULL, NULL,
 483                         BDRV_O_RDWR | BDRV_O_PROTOCOL, &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);