LXR qemu/block/parallels.h

   1/*
   2* Block driver for Parallels disk image format
   3*
   4* Copyright (c) 2015-2017 Virtuozzo, Inc.
   5* Authors:
   6*         2016-2017 Klim S. Kireev <klim.kireev@virtuozzo.com>
   7*         2015 Denis V. Lunev <den@openvz.org>
   8*
   9* This code was originally based on comparing different disk images created
  10* by Parallels. Currently it is based on opened OpenVZ sources
  11* available at
  12*     https://github.com/OpenVZ/ploop
  13*
  14* Permission is hereby granted, free of charge, to any person obtaining a copy
  15* of this software and associated documentation files (the "Software"), to deal
  16* in the Software without restriction, including without limitation the rights
  17* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  18* copies of the Software, and to permit persons to whom the Software is
  19* furnished to do so, subject to the following conditions:
  20*
  21* The above copyright notice and this permission notice shall be included in
  22* all copies or substantial portions of the Software.
  23*
  24* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  25* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  26* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  27* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  28* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  29* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  30* THE SOFTWARE.
  31*/
  32#ifndef BLOCK_PARALLELS_H
  33#define BLOCK_PARALLELS_H
  34#include "qemu/coroutine.h"
  35
  36#define HEADS_NUMBER 16
  37#define SEC_IN_CYL 32
  38#define DEFAULT_CLUSTER_SIZE 1048576        /* 1 MiB */
  39
  40/* always little-endian */
  41typedef struct ParallelsHeader {
  42    char magic[16]; /* "WithoutFreeSpace" */
  43    uint32_t version;
  44    uint32_t heads;
  45    uint32_t cylinders;
  46    uint32_t tracks;
  47    uint32_t bat_entries;
  48    uint64_t nb_sectors;
  49    uint32_t inuse;
  50    uint32_t data_off;
  51    char padding[12];
  52} QEMU_PACKED ParallelsHeader;
  53
  54typedef enum ParallelsPreallocMode {
  55    PRL_PREALLOC_MODE_FALLOCATE = 0,
  56    PRL_PREALLOC_MODE_TRUNCATE = 1,
  57    PRL_PREALLOC_MODE__MAX = 2,
  58} ParallelsPreallocMode;
  59
  60typedef struct BDRVParallelsState {
  61    /** Locking is conservative, the lock protects
  62     *   - image file extending (truncate, fallocate)
  63     *   - any access to block allocation table
  64     */
  65    CoMutex lock;
  66
  67    ParallelsHeader *header;
  68    uint32_t header_size;
  69    bool header_unclean;
  70
  71    unsigned long *bat_dirty_bmap;
  72    unsigned int  bat_dirty_block;
  73
  74    uint32_t *bat_bitmap;
  75    unsigned int bat_size;
  76
  77    int64_t  data_end;
  78    uint64_t prealloc_size;
  79    ParallelsPreallocMode prealloc_mode;
  80
  81    unsigned int tracks;
  82
  83    unsigned int off_multiplier;
  84    Error *migration_blocker;
  85} BDRVParallelsState;
  86
  87#endif
  88