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, int flags);
  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     void (*bdrv_flush)(BlockDriverState *bs);
  40     int (*bdrv_is_allocated)(BlockDriverState *bs, int64_t sector_num,
  41                              int nb_sectors, int *pnum);
  42     int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
  43     int (*bdrv_make_empty)(BlockDriverState *bs);
  44     /* aio */
  45     int (*bdrv_aio_new)(BlockDriverAIOCB *acb);
  46     int (*bdrv_aio_read)(BlockDriverAIOCB *acb, int64_t sector_num,
  47                               uint8_t *buf, int nb_sectors);
  48     int (*bdrv_aio_write)(BlockDriverAIOCB *acb, int64_t sector_num,
  49                           const uint8_t *buf, int nb_sectors);
  50     void (*bdrv_aio_cancel)(BlockDriverAIOCB *acb);
  51     void (*bdrv_aio_delete)(BlockDriverAIOCB *acb);
  52
  53     const char *protocol_name;
  54     int (*bdrv_pread)(BlockDriverState *bs, int64_t offset,
  55                       uint8_t *buf, int count);
  56     int (*bdrv_pwrite)(BlockDriverState *bs, int64_t offset,
  57                        const uint8_t *buf, int count);
  58     int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset);
  59     int64_t (*bdrv_getlength)(BlockDriverState *bs);
  60     int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,
  61                                  const uint8_t *buf, int nb_sectors);
  62
  63     int (*bdrv_snapshot_create)(BlockDriverState *bs,
  64                                 QEMUSnapshotInfo *sn_info);
  65     int (*bdrv_snapshot_goto)(BlockDriverState *bs,
  66                               const char *snapshot_id);
  67     int (*bdrv_snapshot_delete)(BlockDriverState *bs, const char *snapshot_id);
  68     int (*bdrv_snapshot_list)(BlockDriverState *bs,
  69                               QEMUSnapshotInfo **psn_info);
  70     int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
  71
  72     struct BlockDriver *next;
  73 };
  74
  75 struct BlockDriverState {
  76     int64_t total_sectors; /* if we are reading a disk image, give its
  77                               size in sectors */
  78     int read_only; /* if true, the media is read only */
  79     int inserted; /* if true, the media is present */
  80     int removable; /* if true, the media can be removed */
  81     int locked;    /* if true, the media cannot temporarily be ejected */
  82     int encrypted; /* if true, the media is encrypted */
  83     /* event callback when inserting/removing */
  84     void (*change_cb)(void *opaque);
  85     void *change_opaque;
  86
  87     BlockDriver *drv;
  88     void *opaque;
  89
  90     int boot_sector_enabled;
  91     uint8_t boot_sector_data[512];
  92
  93     char filename[1024];
  94     char backing_file[1024]; /* if non zero, the image is a diff of
  95                                 this file image */
  96     int is_temporary;
  97
  98     BlockDriverState *backing_hd;
  99     /* sync read/write emulation */
 100
 101     BlockDriverAIOCB *sync_aiocb;
 102
 103     /* NOTE: the following infos are only hints for real hardware
 104        drivers. They are not used by the block driver */
 105     int cyls, heads, secs, translation;
 106     int type;
 107     char device_name[32];
 108     BlockDriverState *next;
 109 };
 110
 111 struct BlockDriverAIOCB {
 112     BlockDriverState *bs;
 113     BlockDriverCompletionFunc *cb;
 114     void *cb_opaque;
 115
 116     void *opaque; /* driver opaque */
 117 };
 118
 119 void get_tmp_filename(char *filename, int size);
 120
 121 #endif /* BLOCK_INT_H */