qemu

FORK: QEMU emulator
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parallels.h (2973B)

      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_end;
     79     uint64_t prealloc_size;
     80     ParallelsPreallocMode prealloc_mode;
     81 
     82     unsigned int tracks;
     83     unsigned int cluster_size;
     84 
     85     unsigned int off_multiplier;
     86     Error *migration_blocker;
     87 } BDRVParallelsState;
     88 
     89 int parallels_read_format_extension(BlockDriverState *bs,
     90                                     int64_t ext_off, Error **errp);
     91 
     92 #endif