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 */ 41 typedef 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 uint32_t flags; 52 uint64_t ext_off; 53 } QEMU_PACKED ParallelsHeader; 54 55 typedef enum ParallelsPreallocMode { 56 PRL_PREALLOC_MODE_FALLOCATE = 0, 57 PRL_PREALLOC_MODE_TRUNCATE = 1, 58 PRL_PREALLOC_MODE__MAX = 2, 59 } ParallelsPreallocMode; 60 61 typedef struct BDRVParallelsState { 62 /** Locking is conservative, the lock protects 63 * - image file extending (truncate, fallocate) 64 * - any access to block allocation table 65 */ 66 CoMutex lock; 67 68 ParallelsHeader *header; 69 uint32_t header_size; 70 bool header_unclean; 71 72 unsigned long *bat_dirty_bmap; 73 unsigned int bat_dirty_block; 74 75 uint32_t *bat_bitmap; 76 unsigned int bat_size; 77 78 int64_t data_start; 79 int64_t data_end; 80 uint64_t prealloc_size; 81 ParallelsPreallocMode prealloc_mode; 82 83 unsigned int tracks; 84 unsigned int cluster_size; 85 86 unsigned int off_multiplier; 87 Error *migration_blocker; 88 } BDRVParallelsState; 89 90 int parallels_read_format_extension(BlockDriverState *bs, 91 int64_t ext_off, Error **errp); 92 93 #endif 94