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 #define BLOCK_FLAG_ENCRYPT      1
  28 #define BLOCK_FLAG_COMPRESS     2
  29 #define BLOCK_FLAG_COMPAT6      4
  30
  31 struct BlockDriver {
  32     const char *format_name;
  33     int instance_size;
  34     int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename);
  35     int (*bdrv_open)(BlockDriverState *bs, const char *filename, int flags);
  36     int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,
  37                      uint8_t *buf, int nb_sectors);
  38     int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num,
  39                       const uint8_t *buf, int nb_sectors);
  40     void (*bdrv_close)(BlockDriverState *bs);
  41     int (*bdrv_create)(const char *filename, int64_t total_sectors,
  42                        const char *backing_file, int flags);
  43     void (*bdrv_flush)(BlockDriverState *bs);
  44     int (*bdrv_is_allocated)(BlockDriverState *bs, int64_t sector_num,
  45                              int nb_sectors, int *pnum);
  46     int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
  47     int (*bdrv_make_empty)(BlockDriverState *bs);
  48     /* aio */
  49     BlockDriverAIOCB *(*bdrv_aio_read)(BlockDriverState *bs,
  50         int64_t sector_num, uint8_t *buf, int nb_sectors,
  51         BlockDriverCompletionFunc *cb, void *opaque);
  52     BlockDriverAIOCB *(*bdrv_aio_write)(BlockDriverState *bs,
  53         int64_t sector_num, const uint8_t *buf, int nb_sectors,
  54         BlockDriverCompletionFunc *cb, void *opaque);
  55     void (*bdrv_aio_cancel)(BlockDriverAIOCB *acb);
  56     int aiocb_size;
  57
  58     const char *protocol_name;
  59     int (*bdrv_pread)(BlockDriverState *bs, int64_t offset,
  60                       uint8_t *buf, int count);
  61     int (*bdrv_pwrite)(BlockDriverState *bs, int64_t offset,
  62                        const uint8_t *buf, int count);
  63     int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset);
  64     int64_t (*bdrv_getlength)(BlockDriverState *bs);
  65     int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,
  66                                  const uint8_t *buf, int nb_sectors);
  67
  68     int (*bdrv_snapshot_create)(BlockDriverState *bs,
  69                                 QEMUSnapshotInfo *sn_info);
  70     int (*bdrv_snapshot_goto)(BlockDriverState *bs,
  71                               const char *snapshot_id);
  72     int (*bdrv_snapshot_delete)(BlockDriverState *bs, const char *snapshot_id);
  73     int (*bdrv_snapshot_list)(BlockDriverState *bs,
  74                               QEMUSnapshotInfo **psn_info);
  75     int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
  76
  77     /* removable device specific */
  78     int (*bdrv_is_inserted)(BlockDriverState *bs);
  79     int (*bdrv_media_changed)(BlockDriverState *bs);
  80     int (*bdrv_eject)(BlockDriverState *bs, int eject_flag);
  81     int (*bdrv_set_locked)(BlockDriverState *bs, int locked);
  82
  83     BlockDriverAIOCB *free_aiocb;
  84     struct BlockDriver *next;
  85 };
  86
  87 struct BlockDriverState {
  88     int64_t total_sectors; /* if we are reading a disk image, give its
  89                               size in sectors */
  90     int read_only; /* if true, the media is read only */
  91     int removable; /* if true, the media can be removed */
  92     int locked;    /* if true, the media cannot temporarily be ejected */
  93     int encrypted; /* if true, the media is encrypted */
  94     /* event callback when inserting/removing */
  95     void (*change_cb)(void *opaque);
  96     void *change_opaque;
  97
  98     BlockDriver *drv; /* NULL means no media */
  99     void *opaque;
 100
 101     int boot_sector_enabled;
 102     uint8_t boot_sector_data[512];
 103
 104     char filename[1024];
 105     char backing_file[1024]; /* if non zero, the image is a diff of
 106                                 this file image */
 107     int is_temporary;
 108     int media_changed;
 109
 110     BlockDriverState *backing_hd;
 111     /* async read/write emulation */
 112
 113     void *sync_aiocb;
 114
 115     /* NOTE: the following infos are only hints for real hardware
 116        drivers. They are not used by the block driver */
 117     int cyls, heads, secs, translation;
 118     int type;
 119     char device_name[32];
 120     BlockDriverState *next;
 121 };
 122
 123 struct BlockDriverAIOCB {
 124     BlockDriverState *bs;
 125     BlockDriverCompletionFunc *cb;
 126     void *opaque;
 127     BlockDriverAIOCB *next;
 128 };
 129
 130 void get_tmp_filename(char *filename, int size);
 131
 132 void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
 133                    void *opaque);
 134 void qemu_aio_release(void *p);
 135
 136 #endif /* BLOCK_INT_H */