block_int.h

   1 /*
   2  * QEMU System Emulator block driver
   3  *
   4  * Copyright (c) 2003 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #ifndef BLOCK_INT_H
  25 #define BLOCK_INT_H
  26
  27 struct BlockDriver {
  28     const char *format_name;
  29     int instance_size;
  30     int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename);
  31     int (*bdrv_open)(BlockDriverState *bs, const char *filename);
  32     int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,
  33                      uint8_t *buf, int nb_sectors);
  34     int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num,
  35                       const uint8_t *buf, int nb_sectors);
  36     void (*bdrv_close)(BlockDriverState *bs);
  37     int (*bdrv_create)(const char *filename, int64_t total_sectors,
  38                        const char *backing_file, int flags);
  39     int (*bdrv_is_allocated)(BlockDriverState *bs, int64_t sector_num,
  40                              int nb_sectors, int *pnum);
  41     int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
  42     struct BlockDriver *next;
  43 };
  44
  45 struct BlockDriverState {
  46     int64_t total_sectors;
  47     int read_only; /* if true, the media is read only */
  48     int inserted; /* if true, the media is present */
  49     int removable; /* if true, the media can be removed */
  50     int locked;    /* if true, the media cannot temporarily be ejected */
  51     int encrypted; /* if true, the media is encrypted */
  52     /* event callback when inserting/removing */
  53     void (*change_cb)(void *opaque);
  54     void *change_opaque;
  55
  56     BlockDriver *drv;
  57     void *opaque;
  58
  59     int boot_sector_enabled;
  60     uint8_t boot_sector_data[512];
  61
  62     char filename[1024];
  63     char backing_file[1024]; /* if non zero, the image is a diff of
  64                                 this file image */
  65     int is_temporary;
  66
  67     BlockDriverState *backing_hd;
  68
  69     /* NOTE: the following infos are only hints for real hardware
  70        drivers. They are not used by the block driver */
  71     int cyls, heads, secs, translation;
  72     int type;
  73     char device_name[32];
  74     BlockDriverState *next;
  75 };
  76
  77 #endif /* BLOCK_INT_H */