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