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