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
  31 #include "qemu/osdep.h"
  32 #include "qapi/error.h"
  33 #include "block/block_int.h"
  34 #include "sysemu/block-backend.h"
  35 #include "qemu/module.h"
  36 #include "qemu/option.h"
  37 #include "qapi/qmp/qdict.h"
  38 #include "qapi/qobject-input-visitor.h"
  39 #include "qapi/qapi-visit-block-core.h"
  40 #include "qemu/bswap.h"
  41 #include "qemu/bitmap.h"
  42 #include "migration/blocker.h"
  43 #include "parallels.h"
  44
  45 /**************************************************************/
  46
  47 #define HEADER_MAGIC "WithoutFreeSpace"
  48 #define HEADER_MAGIC2 "WithouFreSpacExt"
  49 #define HEADER_VERSION 2
  50 #define HEADER_INUSE_MAGIC  (0x746F6E59)
  51 #define MAX_PARALLELS_IMAGE_FACTOR (1ull << 32)
  52
  53 static QEnumLookup prealloc_mode_lookup = {
  54     .array = (const char *const[]) {
  55         "falloc",
  56         "truncate",
  57     },
  58     .size = PRL_PREALLOC_MODE__MAX
  59 };
  60
  61 #define PARALLELS_OPT_PREALLOC_MODE     "prealloc-mode"
  62 #define PARALLELS_OPT_PREALLOC_SIZE     "prealloc-size"
  63
  64 static QemuOptsList parallels_runtime_opts = {
  65     .name = "parallels",
  66     .head = QTAILQ_HEAD_INITIALIZER(parallels_runtime_opts.head),
  67     .desc = {
  68         {
  69             .name = PARALLELS_OPT_PREALLOC_SIZE,
  70             .type = QEMU_OPT_SIZE,
  71             .help = "Preallocation size on image expansion",
  72             .def_value_str = "128M",
  73         },
  74         {
  75             .name = PARALLELS_OPT_PREALLOC_MODE,
  76             .type = QEMU_OPT_STRING,
  77             .help = "Preallocation mode on image expansion "
  78                     "(allowed values: falloc, truncate)",
  79             .def_value_str = "falloc",
  80         },
  81         { /* end of list */ },
  82     },
  83 };
  84
  85 static QemuOptsList parallels_create_opts = {
  86     .name = "parallels-create-opts",
  87     .head = QTAILQ_HEAD_INITIALIZER(parallels_create_opts.head),
  88     .desc = {
  89         {
  90             .name = BLOCK_OPT_SIZE,
  91             .type = QEMU_OPT_SIZE,
  92             .help = "Virtual disk size",
  93         },
  94         {
  95             .name = BLOCK_OPT_CLUSTER_SIZE,
  96             .type = QEMU_OPT_SIZE,
  97             .help = "Parallels image cluster size",
  98             .def_value_str = stringify(DEFAULT_CLUSTER_SIZE),
  99         },
 100         { /* end of list */ }
 101     }
 102 };
 103
 104
 105 static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx)
 106 {
 107     return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier;
 108 }
 109
 110 static uint32_t bat_entry_off(uint32_t idx)
 111 {
 112     return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx;
 113 }
 114
 115 static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num)
 116 {
 117     uint32_t index, offset;
 118
 119     index = sector_num / s->tracks;
 120     offset = sector_num % s->tracks;
 121
 122     /* not allocated */
 123     if ((index >= s->bat_size) || (s->bat_bitmap[index] == 0)) {
 124         return -1;
 125     }
 126     return bat2sect(s, index) + offset;
 127 }
 128
 129 static int cluster_remainder(BDRVParallelsState *s, int64_t sector_num,
 130         int nb_sectors)
 131 {
 132     int ret = s->tracks - sector_num % s->tracks;
 133     return MIN(nb_sectors, ret);
 134 }
 135
 136 static int64_t block_status(BDRVParallelsState *s, int64_t sector_num,
 137                             int nb_sectors, int *pnum)
 138 {
 139     int64_t start_off = -2, prev_end_off = -2;
 140
 141     *pnum = 0;
 142     while (nb_sectors > 0 || start_off == -2) {
 143         int64_t offset = seek_to_sector(s, sector_num);
 144         int to_end;
 145
 146         if (start_off == -2) {
 147             start_off = offset;
 148             prev_end_off = offset;
 149         } else if (offset != prev_end_off) {
 150             break;
 151         }
 152
 153         to_end = cluster_remainder(s, sector_num, nb_sectors);
 154         nb_sectors -= to_end;
 155         sector_num += to_end;
 156         *pnum += to_end;
 157
 158         if (offset > 0) {
 159             prev_end_off += to_end;
 160         }
 161     }
 162     return start_off;
 163 }
 164
 165 static int64_t allocate_clusters(BlockDriverState *bs, int64_t sector_num,
 166                                  int nb_sectors, int *pnum)
 167 {
 168     int ret;
 169     BDRVParallelsState *s = bs->opaque;
 170     int64_t pos, space, idx, to_allocate, i, len;
 171
 172     pos = block_status(s, sector_num, nb_sectors, pnum);
 173     if (pos > 0) {
 174         return pos;
 175     }
 176
 177     idx = sector_num / s->tracks;
 178     to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx;
 179
 180     /* This function is called only by parallels_co_writev(), which will never
 181      * pass a sector_num at or beyond the end of the image (because the block
 182      * layer never passes such a sector_num to that function). Therefore, idx
 183      * is always below s->bat_size.
 184      * block_status() will limit *pnum so that sector_num + *pnum will not
 185      * exceed the image end. Therefore, idx + to_allocate cannot exceed
 186      * s->bat_size.
 187      * Note that s->bat_size is an unsigned int, therefore idx + to_allocate
 188      * will always fit into a uint32_t. */
 189     assert(idx < s->bat_size && idx + to_allocate <= s->bat_size);
 190
 191     space = to_allocate * s->tracks;
 192     len = bdrv_getlength(bs->file->bs);
 193     if (len < 0) {
 194         return len;
 195     }
 196     if (s->data_end + space > (len >> BDRV_SECTOR_BITS)) {
 197         space += s->prealloc_size;
 198         if (s->prealloc_mode == PRL_PREALLOC_MODE_FALLOCATE) {
 199             ret = bdrv_pwrite_zeroes(bs->file,
 200                                      s->data_end << BDRV_SECTOR_BITS,
 201                                      space << BDRV_SECTOR_BITS, 0);
 202         } else {
 203             ret = bdrv_truncate(bs->file,
 204                                 (s->data_end + space) << BDRV_SECTOR_BITS,
 205                                 PREALLOC_MODE_OFF, NULL);
 206         }
 207         if (ret < 0) {
 208             return ret;
 209         }
 210     }
 211
 212     /* Try to read from backing to fill empty clusters
 213      * FIXME: 1. previous write_zeroes may be redundant
 214      *        2. most of data we read from backing will be rewritten by
 215      *           parallels_co_writev. On aligned-to-cluster write we do not need
 216      *           this read at all.
 217      *        3. it would be good to combine write of data from backing and new
 218      *           data into one write call */
 219     if (bs->backing) {
 220         int64_t nb_cow_sectors = to_allocate * s->tracks;
 221         int64_t nb_cow_bytes = nb_cow_sectors << BDRV_SECTOR_BITS;
 222         QEMUIOVector qiov;
 223         struct iovec iov = {
 224             .iov_len = nb_cow_bytes,
 225             .iov_base = qemu_blockalign(bs, nb_cow_bytes)
 226         };
 227         qemu_iovec_init_external(&qiov, &iov, 1);
 228
 229         ret = bdrv_co_readv(bs->backing, idx * s->tracks, nb_cow_sectors,
 230                             &qiov);
 231         if (ret < 0) {
 232             qemu_vfree(iov.iov_base);
 233             return ret;
 234         }
 235
 236         ret = bdrv_co_writev(bs->file, s->data_end, nb_cow_sectors, &qiov);
 237         qemu_vfree(iov.iov_base);
 238         if (ret < 0) {
 239             return ret;
 240         }
 241     }
 242
 243     for (i = 0; i < to_allocate; i++) {
 244         s->bat_bitmap[idx + i] = cpu_to_le32(s->data_end / s->off_multiplier);
 245         s->data_end += s->tracks;
 246         bitmap_set(s->bat_dirty_bmap,
 247                    bat_entry_off(idx + i) / s->bat_dirty_block, 1);
 248     }
 249
 250     return bat2sect(s, idx) + sector_num % s->tracks;
 251 }
 252
 253
 254 static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs)
 255 {
 256     BDRVParallelsState *s = bs->opaque;
 257     unsigned long size = DIV_ROUND_UP(s->header_size, s->bat_dirty_block);
 258     unsigned long bit;
 259
 260     qemu_co_mutex_lock(&s->lock);
 261
 262     bit = find_first_bit(s->bat_dirty_bmap, size);
 263     while (bit < size) {
 264         uint32_t off = bit * s->bat_dirty_block;
 265         uint32_t to_write = s->bat_dirty_block;
 266         int ret;
 267
 268         if (off + to_write > s->header_size) {
 269             to_write = s->header_size - off;
 270         }
 271         ret = bdrv_pwrite(bs->file, off, (uint8_t *)s->header + off,
 272                           to_write);
 273         if (ret < 0) {
 274             qemu_co_mutex_unlock(&s->lock);
 275             return ret;
 276         }
 277         bit = find_next_bit(s->bat_dirty_bmap, size, bit + 1);
 278     }
 279     bitmap_zero(s->bat_dirty_bmap, size);
 280
 281     qemu_co_mutex_unlock(&s->lock);
 282     return 0;
 283 }
 284
 285
 286 static int coroutine_fn parallels_co_block_status(BlockDriverState *bs,
 287                                                   bool want_zero,
 288                                                   int64_t offset,
 289                                                   int64_t bytes,
 290                                                   int64_t *pnum,
 291                                                   int64_t *map,
 292                                                   BlockDriverState **file)
 293 {
 294     BDRVParallelsState *s = bs->opaque;
 295     int count;
 296
 297     assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE));
 298     qemu_co_mutex_lock(&s->lock);
 299     offset = block_status(s, offset >> BDRV_SECTOR_BITS,
 300                           bytes >> BDRV_SECTOR_BITS, &count);
 301     qemu_co_mutex_unlock(&s->lock);
 302
 303     *pnum = count * BDRV_SECTOR_SIZE;
 304     if (offset < 0) {
 305         return 0;
 306     }
 307
 308     *map = offset * BDRV_SECTOR_SIZE;
 309     *file = bs->file->bs;
 310     return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
 311 }
 312
 313 static coroutine_fn int parallels_co_writev(BlockDriverState *bs,
 314                                             int64_t sector_num, int nb_sectors,
 315                                             QEMUIOVector *qiov, int flags)
 316 {
 317     BDRVParallelsState *s = bs->opaque;
 318     uint64_t bytes_done = 0;
 319     QEMUIOVector hd_qiov;
 320     int ret = 0;
 321
 322     assert(!flags);
 323     qemu_iovec_init(&hd_qiov, qiov->niov);
 324
 325     while (nb_sectors > 0) {
 326         int64_t position;
 327         int n, nbytes;
 328
 329         qemu_co_mutex_lock(&s->lock);
 330         position = allocate_clusters(bs, sector_num, nb_sectors, &n);
 331         qemu_co_mutex_unlock(&s->lock);
 332         if (position < 0) {
 333             ret = (int)position;
 334             break;
 335         }
 336
 337         nbytes = n << BDRV_SECTOR_BITS;
 338
 339         qemu_iovec_reset(&hd_qiov);
 340         qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
 341
 342         ret = bdrv_co_writev(bs->file, position, n, &hd_qiov);
 343         if (ret < 0) {
 344             break;
 345         }
 346
 347         nb_sectors -= n;
 348         sector_num += n;
 349         bytes_done += nbytes;
 350     }
 351
 352     qemu_iovec_destroy(&hd_qiov);
 353     return ret;
 354 }
 355
 356 static coroutine_fn int parallels_co_readv(BlockDriverState *bs,
 357         int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
 358 {
 359     BDRVParallelsState *s = bs->opaque;
 360     uint64_t bytes_done = 0;
 361     QEMUIOVector hd_qiov;
 362     int ret = 0;
 363
 364     qemu_iovec_init(&hd_qiov, qiov->niov);
 365
 366     while (nb_sectors > 0) {
 367         int64_t position;
 368         int n, nbytes;
 369
 370         qemu_co_mutex_lock(&s->lock);
 371         position = block_status(s, sector_num, nb_sectors, &n);
 372         qemu_co_mutex_unlock(&s->lock);
 373
 374         nbytes = n << BDRV_SECTOR_BITS;
 375
 376         qemu_iovec_reset(&hd_qiov);
 377         qemu_iovec_concat(&hd_qiov, qiov, bytes_done, nbytes);
 378
 379         if (position < 0) {
 380             if (bs->backing) {
 381                 ret = bdrv_co_readv(bs->backing, sector_num, n, &hd_qiov);
 382                 if (ret < 0) {
 383                     break;
 384                 }
 385             } else {
 386                 qemu_iovec_memset(&hd_qiov, 0, 0, nbytes);
 387             }
 388         } else {
 389             ret = bdrv_co_readv(bs->file, position, n, &hd_qiov);
 390             if (ret < 0) {
 391                 break;
 392             }
 393         }
 394
 395         nb_sectors -= n;
 396         sector_num += n;
 397         bytes_done += nbytes;
 398     }
 399
 400     qemu_iovec_destroy(&hd_qiov);
 401     return ret;
 402 }
 403
 404
 405 static int coroutine_fn parallels_co_check(BlockDriverState *bs,
 406                                            BdrvCheckResult *res,
 407                                            BdrvCheckMode fix)
 408 {
 409     BDRVParallelsState *s = bs->opaque;
 410     int64_t size, prev_off, high_off;
 411     int ret;
 412     uint32_t i;
 413     bool flush_bat = false;
 414     int cluster_size = s->tracks << BDRV_SECTOR_BITS;
 415
 416     size = bdrv_getlength(bs->file->bs);
 417     if (size < 0) {
 418         res->check_errors++;
 419         return size;
 420     }
 421
 422     qemu_co_mutex_lock(&s->lock);
 423     if (s->header_unclean) {
 424         fprintf(stderr, "%s image was not closed correctly\n",
 425                 fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR");
 426         res->corruptions++;
 427         if (fix & BDRV_FIX_ERRORS) {
 428             /* parallels_close will do the job right */
 429             res->corruptions_fixed++;
 430             s->header_unclean = false;
 431         }
 432     }
 433
 434     res->bfi.total_clusters = s->bat_size;
 435     res->bfi.compressed_clusters = 0; /* compression is not supported */
 436
 437     high_off = 0;
 438     prev_off = 0;
 439     for (i = 0; i < s->bat_size; i++) {
 440         int64_t off = bat2sect(s, i) << BDRV_SECTOR_BITS;
 441         if (off == 0) {
 442             prev_off = 0;
 443             continue;
 444         }
 445
 446         /* cluster outside the image */
 447         if (off > size) {
 448             fprintf(stderr, "%s cluster %u is outside image\n",
 449                     fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i);
 450             res->corruptions++;
 451             if (fix & BDRV_FIX_ERRORS) {
 452                 prev_off = 0;
 453                 s->bat_bitmap[i] = 0;
 454                 res->corruptions_fixed++;
 455                 flush_bat = true;
 456                 continue;
 457             }
 458         }
 459
 460         res->bfi.allocated_clusters++;
 461         if (off > high_off) {
 462             high_off = off;
 463         }
 464
 465         if (prev_off != 0 && (prev_off + cluster_size) != off) {
 466             res->bfi.fragmented_clusters++;
 467         }
 468         prev_off = off;
 469     }
 470
 471     ret = 0;
 472     if (flush_bat) {
 473         ret = bdrv_pwrite_sync(bs->file, 0, s->header, s->header_size);
 474         if (ret < 0) {
 475             res->check_errors++;
 476             goto out;
 477         }
 478     }
 479
 480     res->image_end_offset = high_off + cluster_size;
 481     if (size > res->image_end_offset) {
 482         int64_t count;
 483         count = DIV_ROUND_UP(size - res->image_end_offset, cluster_size);
 484         fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n",
 485                 fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR",
 486                 size - res->image_end_offset);
 487         res->leaks += count;
 488         if (fix & BDRV_FIX_LEAKS) {
 489             Error *local_err = NULL;
 490             ret = bdrv_truncate(bs->file, res->image_end_offset,
 491                                 PREALLOC_MODE_OFF, &local_err);
 492             if (ret < 0) {
 493                 error_report_err(local_err);
 494                 res->check_errors++;
 495                 goto out;
 496             }
 497             res->leaks_fixed += count;
 498         }
 499     }
 500
 501 out:
 502     qemu_co_mutex_unlock(&s->lock);
 503     return ret;
 504 }
 505
 506
 507 static int coroutine_fn parallels_co_create(BlockdevCreateOptions* opts,
 508                                             Error **errp)
 509 {
 510     BlockdevCreateOptionsParallels *parallels_opts;
 511     BlockDriverState *bs;
 512     BlockBackend *blk;
 513     int64_t total_size, cl_size;
 514     uint32_t bat_entries, bat_sectors;
 515     ParallelsHeader header;
 516     uint8_t tmp[BDRV_SECTOR_SIZE];
 517     int ret;
 518
 519     assert(opts->driver == BLOCKDEV_DRIVER_PARALLELS);
 520     parallels_opts = &opts->u.parallels;
 521
 522     /* Sanity checks */
 523     total_size = parallels_opts->size;
 524
 525     if (parallels_opts->has_cluster_size) {
 526         cl_size = parallels_opts->cluster_size;
 527     } else {
 528         cl_size = DEFAULT_CLUSTER_SIZE;
 529     }
 530
 531     /* XXX What is the real limit here? This is an insanely large maximum. */
 532     if (cl_size >= INT64_MAX / MAX_PARALLELS_IMAGE_FACTOR) {
 533         error_setg(errp, "Cluster size is too large");
 534         return -EINVAL;
 535     }
 536     if (total_size >= MAX_PARALLELS_IMAGE_FACTOR * cl_size) {
 537         error_setg(errp, "Image size is too large for this cluster size");
 538         return -E2BIG;
 539     }
 540
 541     if (!QEMU_IS_ALIGNED(total_size, BDRV_SECTOR_SIZE)) {
 542         error_setg(errp, "Image size must be a multiple of 512 bytes");
 543         return -EINVAL;
 544     }
 545
 546     if (!QEMU_IS_ALIGNED(cl_size, BDRV_SECTOR_SIZE)) {
 547         error_setg(errp, "Cluster size must be a multiple of 512 bytes");
 548         return -EINVAL;
 549     }
 550
 551     /* Create BlockBackend to write to the image */
 552     bs = bdrv_open_blockdev_ref(parallels_opts->file, errp);
 553     if (bs == NULL) {
 554         return -EIO;
 555     }
 556
 557     blk = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL);
 558     ret = blk_insert_bs(blk, bs, errp);
 559     if (ret < 0) {
 560         goto out;
 561     }
 562     blk_set_allow_write_beyond_eof(blk, true);
 563
 564     /* Create image format */
 565     ret = blk_truncate(blk, 0, PREALLOC_MODE_OFF, errp);
 566     if (ret < 0) {
 567         goto out;
 568     }
 569
 570     bat_entries = DIV_ROUND_UP(total_size, cl_size);
 571     bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size);
 572     bat_sectors = (bat_sectors *  cl_size) >> BDRV_SECTOR_BITS;
 573
 574     memset(&header, 0, sizeof(header));
 575     memcpy(header.magic, HEADER_MAGIC2, sizeof(header.magic));
 576     header.version = cpu_to_le32(HEADER_VERSION);
 577     /* don't care much about geometry, it is not used on image level */
 578     header.heads = cpu_to_le32(HEADS_NUMBER);
 579     header.cylinders = cpu_to_le32(total_size / BDRV_SECTOR_SIZE
 580                                    / HEADS_NUMBER / SEC_IN_CYL);
 581     header.tracks = cpu_to_le32(cl_size >> BDRV_SECTOR_BITS);
 582     header.bat_entries = cpu_to_le32(bat_entries);
 583     header.nb_sectors = cpu_to_le64(DIV_ROUND_UP(total_size, BDRV_SECTOR_SIZE));
 584     header.data_off = cpu_to_le32(bat_sectors);
 585
 586     /* write all the data */
 587     memset(tmp, 0, sizeof(tmp));
 588     memcpy(tmp, &header, sizeof(header));
 589
 590     ret = blk_pwrite(blk, 0, tmp, BDRV_SECTOR_SIZE, 0);
 591     if (ret < 0) {
 592         goto exit;
 593     }
 594     ret = blk_pwrite_zeroes(blk, BDRV_SECTOR_SIZE,
 595                             (bat_sectors - 1) << BDRV_SECTOR_BITS, 0);
 596     if (ret < 0) {
 597         goto exit;
 598     }
 599
 600     ret = 0;
 601 out:
 602     blk_unref(blk);
 603     bdrv_unref(bs);
 604     return ret;
 605
 606 exit:
 607     error_setg_errno(errp, -ret, "Failed to create Parallels image");
 608     goto out;
 609 }
 610
 611 static int coroutine_fn parallels_co_create_opts(const char *filename,
 612                                                  QemuOpts *opts,
 613                                                  Error **errp)
 614 {
 615     BlockdevCreateOptions *create_options = NULL;
 616     Error *local_err = NULL;
 617     BlockDriverState *bs = NULL;
 618     QDict *qdict = NULL;
 619     QObject *qobj;
 620     Visitor *v;
 621     int ret;
 622
 623     static const QDictRenames opt_renames[] = {
 624         { BLOCK_OPT_CLUSTER_SIZE,       "cluster-size" },
 625         { NULL, NULL },
 626     };
 627
 628     /* Parse options and convert legacy syntax */
 629     qdict = qemu_opts_to_qdict_filtered(opts, NULL, &parallels_create_opts,
 630                                         true);
 631
 632     if (!qdict_rename_keys(qdict, opt_renames, errp)) {
 633         ret = -EINVAL;
 634         goto done;
 635     }
 636
 637     /* Create and open the file (protocol layer) */
 638     ret = bdrv_create_file(filename, opts, &local_err);
 639     if (ret < 0) {
 640         error_propagate(errp, local_err);
 641         goto done;
 642     }
 643
 644     bs = bdrv_open(filename, NULL, NULL,
 645                    BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp);
 646     if (bs == NULL) {
 647         ret = -EIO;
 648         goto done;
 649     }
 650
 651     /* Now get the QAPI type BlockdevCreateOptions */
 652     qdict_put_str(qdict, "driver", "parallels");
 653     qdict_put_str(qdict, "file", bs->node_name);
 654
 655     qobj = qdict_crumple(qdict, errp);
 656     qobject_unref(qdict);
 657     qdict = qobject_to(QDict, qobj);
 658     if (qdict == NULL) {
 659         ret = -EINVAL;
 660         goto done;
 661     }
 662
 663     v = qobject_input_visitor_new_keyval(QOBJECT(qdict));
 664     visit_type_BlockdevCreateOptions(v, NULL, &create_options, &local_err);
 665     visit_free(v);
 666
 667     if (local_err) {
 668         error_propagate(errp, local_err);
 669         ret = -EINVAL;
 670         goto done;
 671     }
 672
 673     /* Silently round up sizes */
 674     create_options->u.parallels.size =
 675         ROUND_UP(create_options->u.parallels.size, BDRV_SECTOR_SIZE);
 676     create_options->u.parallels.cluster_size =
 677         ROUND_UP(create_options->u.parallels.cluster_size, BDRV_SECTOR_SIZE);
 678
 679     /* Create the Parallels image (format layer) */
 680     ret = parallels_co_create(create_options, errp);
 681     if (ret < 0) {
 682         goto done;
 683     }
 684     ret = 0;
 685
 686 done:
 687     qobject_unref(qdict);
 688     bdrv_unref(bs);
 689     qapi_free_BlockdevCreateOptions(create_options);
 690     return ret;
 691 }
 692
 693
 694 static int parallels_probe(const uint8_t *buf, int buf_size,
 695                            const char *filename)
 696 {
 697     const ParallelsHeader *ph = (const void *)buf;
 698
 699     if (buf_size < sizeof(ParallelsHeader)) {
 700         return 0;
 701     }
 702
 703     if ((!memcmp(ph->magic, HEADER_MAGIC, 16) ||
 704            !memcmp(ph->magic, HEADER_MAGIC2, 16)) &&
 705            (le32_to_cpu(ph->version) == HEADER_VERSION)) {
 706         return 100;
 707     }
 708
 709     return 0;
 710 }
 711
 712 static int parallels_update_header(BlockDriverState *bs)
 713 {
 714     BDRVParallelsState *s = bs->opaque;
 715     unsigned size = MAX(bdrv_opt_mem_align(bs->file->bs),
 716                         sizeof(ParallelsHeader));
 717
 718     if (size > s->header_size) {
 719         size = s->header_size;
 720     }
 721     return bdrv_pwrite_sync(bs->file, 0, s->header, size);
 722 }
 723
 724 static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
 725                           Error **errp)
 726 {
 727     BDRVParallelsState *s = bs->opaque;
 728     ParallelsHeader ph;
 729     int ret, size, i;
 730     QemuOpts *opts = NULL;
 731     Error *local_err = NULL;
 732     char *buf;
 733
 734     bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
 735                                false, errp);
 736     if (!bs->file) {
 737         return -EINVAL;
 738     }
 739
 740     ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph));
 741     if (ret < 0) {
 742         goto fail;
 743     }
 744
 745     bs->total_sectors = le64_to_cpu(ph.nb_sectors);
 746
 747     if (le32_to_cpu(ph.version) != HEADER_VERSION) {
 748         goto fail_format;
 749     }
 750     if (!memcmp(ph.magic, HEADER_MAGIC, 16)) {
 751         s->off_multiplier = 1;
 752         bs->total_sectors = 0xffffffff & bs->total_sectors;
 753     } else if (!memcmp(ph.magic, HEADER_MAGIC2, 16)) {
 754         s->off_multiplier = le32_to_cpu(ph.tracks);
 755     } else {
 756         goto fail_format;
 757     }
 758
 759     s->tracks = le32_to_cpu(ph.tracks);
 760     if (s->tracks == 0) {
 761         error_setg(errp, "Invalid image: Zero sectors per track");
 762         ret = -EINVAL;
 763         goto fail;
 764     }
 765     if (s->tracks > INT32_MAX/513) {
 766         error_setg(errp, "Invalid image: Too big cluster");
 767         ret = -EFBIG;
 768         goto fail;
 769     }
 770
 771     s->bat_size = le32_to_cpu(ph.bat_entries);
 772     if (s->bat_size > INT_MAX / sizeof(uint32_t)) {
 773         error_setg(errp, "Catalog too large");
 774         ret = -EFBIG;
 775         goto fail;
 776     }
 777
 778     size = bat_entry_off(s->bat_size);
 779     s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file->bs));
 780     s->header = qemu_try_blockalign(bs->file->bs, s->header_size);
 781     if (s->header == NULL) {
 782         ret = -ENOMEM;
 783         goto fail;
 784     }
 785     s->data_end = le32_to_cpu(ph.data_off);
 786     if (s->data_end == 0) {
 787         s->data_end = ROUND_UP(bat_entry_off(s->bat_size), BDRV_SECTOR_SIZE);
 788     }
 789     if (s->data_end < s->header_size) {
 790         /* there is not enough unused space to fit to block align between BAT
 791            and actual data. We can't avoid read-modify-write... */
 792         s->header_size = size;
 793     }
 794
 795     ret = bdrv_pread(bs->file, 0, s->header, s->header_size);
 796     if (ret < 0) {
 797         goto fail;
 798     }
 799     s->bat_bitmap = (uint32_t *)(s->header + 1);
 800
 801     for (i = 0; i < s->bat_size; i++) {
 802         int64_t off = bat2sect(s, i);
 803         if (off >= s->data_end) {
 804             s->data_end = off + s->tracks;
 805         }
 806     }
 807
 808     if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) {
 809         /* Image was not closed correctly. The check is mandatory */
 810         s->header_unclean = true;
 811         if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) {
 812             error_setg(errp, "parallels: Image was not closed correctly; "
 813                        "cannot be opened read/write");
 814             ret = -EACCES;
 815             goto fail;
 816         }
 817     }
 818
 819     opts = qemu_opts_create(&parallels_runtime_opts, NULL, 0, &local_err);
 820     if (local_err != NULL) {
 821         goto fail_options;
 822     }
 823
 824     qemu_opts_absorb_qdict(opts, options, &local_err);
 825     if (local_err != NULL) {
 826         goto fail_options;
 827     }
 828
 829     s->prealloc_size =
 830         qemu_opt_get_size_del(opts, PARALLELS_OPT_PREALLOC_SIZE, 0);
 831     s->prealloc_size = MAX(s->tracks, s->prealloc_size >> BDRV_SECTOR_BITS);
 832     buf = qemu_opt_get_del(opts, PARALLELS_OPT_PREALLOC_MODE);
 833     s->prealloc_mode = qapi_enum_parse(&prealloc_mode_lookup, buf,
 834                                        PRL_PREALLOC_MODE_FALLOCATE,
 835                                        &local_err);
 836     g_free(buf);
 837     if (local_err != NULL) {
 838         goto fail_options;
 839     }
 840
 841     if (!bdrv_has_zero_init(bs->file->bs)) {
 842         s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE;
 843     }
 844
 845     if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_INACTIVE)) {
 846         s->header->inuse = cpu_to_le32(HEADER_INUSE_MAGIC);
 847         ret = parallels_update_header(bs);
 848         if (ret < 0) {
 849             goto fail;
 850         }
 851     }
 852
 853     s->bat_dirty_block = 4 * getpagesize();
 854     s->bat_dirty_bmap =
 855         bitmap_new(DIV_ROUND_UP(s->header_size, s->bat_dirty_block));
 856
 857     /* Disable migration until bdrv_invalidate_cache method is added */
 858     error_setg(&s->migration_blocker, "The Parallels format used by node '%s' "
 859                "does not support live migration",
 860                bdrv_get_device_or_node_name(bs));
 861     ret = migrate_add_blocker(s->migration_blocker, &local_err);
 862     if (local_err) {
 863         error_propagate(errp, local_err);
 864         error_free(s->migration_blocker);
 865         goto fail;
 866     }
 867     qemu_co_mutex_init(&s->lock);
 868     return 0;
 869
 870 fail_format:
 871     error_setg(errp, "Image not in Parallels format");
 872     ret = -EINVAL;
 873 fail:
 874     qemu_vfree(s->header);
 875     return ret;
 876
 877 fail_options:
 878     error_propagate(errp, local_err);
 879     ret = -EINVAL;
 880     goto fail;
 881 }
 882
 883
 884 static void parallels_close(BlockDriverState *bs)
 885 {
 886     BDRVParallelsState *s = bs->opaque;
 887
 888     if ((bs->open_flags & BDRV_O_RDWR) && !(bs->open_flags & BDRV_O_INACTIVE)) {
 889         s->header->inuse = 0;
 890         parallels_update_header(bs);
 891         bdrv_truncate(bs->file, s->data_end << BDRV_SECTOR_BITS,
 892                       PREALLOC_MODE_OFF, NULL);
 893     }
 894
 895     g_free(s->bat_dirty_bmap);
 896     qemu_vfree(s->header);
 897
 898     migrate_del_blocker(s->migration_blocker);
 899     error_free(s->migration_blocker);
 900 }
 901
 902 static BlockDriver bdrv_parallels = {
 903     .format_name        = "parallels",
 904     .instance_size      = sizeof(BDRVParallelsState),
 905     .bdrv_probe         = parallels_probe,
 906     .bdrv_open          = parallels_open,
 907     .bdrv_close         = parallels_close,
 908     .bdrv_child_perm          = bdrv_format_default_perms,
 909     .bdrv_co_block_status     = parallels_co_block_status,
 910     .bdrv_has_zero_init       = bdrv_has_zero_init_1,
 911     .bdrv_co_flush_to_os      = parallels_co_flush_to_os,
 912     .bdrv_co_readv  = parallels_co_readv,
 913     .bdrv_co_writev = parallels_co_writev,
 914     .supports_backing = true,
 915     .bdrv_co_create      = parallels_co_create,
 916     .bdrv_co_create_opts = parallels_co_create_opts,
 917     .bdrv_co_check  = parallels_co_check,
 918     .create_opts    = &parallels_create_opts,
 919 };
 920
 921 static void bdrv_parallels_init(void)
 922 {
 923     bdrv_register(&bdrv_parallels);
 924 }
 925
 926 block_init(bdrv_parallels_init);