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 #include "block.h"
  28
  29 #define BLOCK_FLAG_ENCRYPT      1
  30 #define BLOCK_FLAG_COMPRESS     2
  31 #define BLOCK_FLAG_COMPAT6      4
  32
  33 struct BlockDriver {
  34     const char *format_name;
  35     int instance_size;
  36     int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename);
  37     int (*bdrv_open)(BlockDriverState *bs, const char *filename, int flags);
  38     int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,
  39                      uint8_t *buf, int nb_sectors);
  40     int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num,
  41                       const uint8_t *buf, int nb_sectors);
  42     void (*bdrv_close)(BlockDriverState *bs);
  43     int (*bdrv_create)(const char *filename, int64_t total_sectors,
  44                        const char *backing_file, int flags);
  45     void (*bdrv_flush)(BlockDriverState *bs);
  46     int (*bdrv_is_allocated)(BlockDriverState *bs, int64_t sector_num,
  47                              int nb_sectors, int *pnum);
  48     int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
  49     int (*bdrv_make_empty)(BlockDriverState *bs);
  50     /* aio */
  51     BlockDriverAIOCB *(*bdrv_aio_read)(BlockDriverState *bs,
  52         int64_t sector_num, uint8_t *buf, int nb_sectors,
  53         BlockDriverCompletionFunc *cb, void *opaque);
  54     BlockDriverAIOCB *(*bdrv_aio_write)(BlockDriverState *bs,
  55         int64_t sector_num, const uint8_t *buf, int nb_sectors,
  56         BlockDriverCompletionFunc *cb, void *opaque);
  57     void (*bdrv_aio_cancel)(BlockDriverAIOCB *acb);
  58     int aiocb_size;
  59
  60     const char *protocol_name;
  61     int (*bdrv_pread)(BlockDriverState *bs, int64_t offset,
  62                       uint8_t *buf, int count);
  63     int (*bdrv_pwrite)(BlockDriverState *bs, int64_t offset,
  64                        const uint8_t *buf, int count);
  65     int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset);
  66     int64_t (*bdrv_getlength)(BlockDriverState *bs);
  67     int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,
  68                                  const uint8_t *buf, int nb_sectors);
  69
  70     int (*bdrv_snapshot_create)(BlockDriverState *bs,
  71                                 QEMUSnapshotInfo *sn_info);
  72     int (*bdrv_snapshot_goto)(BlockDriverState *bs,
  73                               const char *snapshot_id);
  74     int (*bdrv_snapshot_delete)(BlockDriverState *bs, const char *snapshot_id);
  75     int (*bdrv_snapshot_list)(BlockDriverState *bs,
  76                               QEMUSnapshotInfo **psn_info);
  77     int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
  78
  79     /* removable device specific */
  80     int (*bdrv_is_inserted)(BlockDriverState *bs);
  81     int (*bdrv_media_changed)(BlockDriverState *bs);
  82     int (*bdrv_eject)(BlockDriverState *bs, int eject_flag);
  83     int (*bdrv_set_locked)(BlockDriverState *bs, int locked);
  84
  85     /* to control generic scsi devices */
  86     int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf);
  87
  88     BlockDriverAIOCB *free_aiocb;
  89     struct BlockDriver *next;
  90 };
  91
  92 struct BlockDriverState {
  93     int64_t total_sectors; /* if we are reading a disk image, give its
  94                               size in sectors */
  95     int read_only; /* if true, the media is read only */
  96     int removable; /* if true, the media can be removed */
  97     int locked;    /* if true, the media cannot temporarily be ejected */
  98     int encrypted; /* if true, the media is encrypted */
  99     int sg;        /* if true, the device is a /dev/sg* */
 100     /* event callback when inserting/removing */
 101     void (*change_cb)(void *opaque);
 102     void *change_opaque;
 103
 104     BlockDriver *drv; /* NULL means no media */
 105     void *opaque;
 106
 107     char filename[1024];
 108     char backing_file[1024]; /* if non zero, the image is a diff of
 109                                 this file image */
 110     int is_temporary;
 111     int media_changed;
 112
 113     BlockDriverState *backing_hd;
 114     /* async read/write emulation */
 115
 116     void *sync_aiocb;
 117
 118     /* I/O stats (display with "info blockstats"). */
 119     uint64_t rd_bytes;
 120     uint64_t wr_bytes;
 121     uint64_t rd_ops;
 122     uint64_t wr_ops;
 123
 124     /* NOTE: the following infos are only hints for real hardware
 125        drivers. They are not used by the block driver */
 126     int cyls, heads, secs, translation;
 127     int type;
 128     char device_name[32];
 129     BlockDriverState *next;
 130 };
 131
 132 struct BlockDriverAIOCB {
 133     BlockDriverState *bs;
 134     BlockDriverCompletionFunc *cb;
 135     void *opaque;
 136     BlockDriverAIOCB *next;
 137 };
 138
 139 void get_tmp_filename(char *filename, int size);
 140
 141 void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
 142                    void *opaque);
 143 void qemu_aio_release(void *p);
 144
 145 extern BlockDriverState *bdrv_first;
 146
 147 #endif /* BLOCK_INT_H */