Archipelago » qemu

/*

 * QEMU System Emulator block driver

 *

 * Copyright (c) 2003 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#ifndef BLOCK_INT_H

#define BLOCK_INT_H

#include "block.h"

#include "qemu-option.h"

#define BLOCK_FLAG_ENCRYPT        1

#define BLOCK_FLAG_COMPRESS        2

#define BLOCK_FLAG_COMPAT6        4

#define BLOCK_OPT_SIZE          "size"

#define BLOCK_OPT_ENCRYPT       "encryption"

#define BLOCK_OPT_COMPAT6       "compat6"

#define BLOCK_OPT_BACKING_FILE  "backing_file"

#define BLOCK_OPT_BACKING_FMT   "backing_fmt"

#define BLOCK_OPT_CLUSTER_SIZE  "cluster_size"

typedef struct AIOPool {

    void (*cancel)(BlockDriverAIOCB *acb);

    int aiocb_size;

    BlockDriverAIOCB *free_aiocb;

} AIOPool;

struct BlockDriver {

    const char *format_name;

    int instance_size;

    int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename);

    int (*bdrv_open)(BlockDriverState *bs, const char *filename, int flags);

    int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,

                     uint8_t *buf, int nb_sectors);

    int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num,

                      const uint8_t *buf, int nb_sectors);

    void (*bdrv_close)(BlockDriverState *bs);

    int (*bdrv_create)(const char *filename, QEMUOptionParameter *options);

    void (*bdrv_flush)(BlockDriverState *bs);

    int (*bdrv_is_allocated)(BlockDriverState *bs, int64_t sector_num,

                             int nb_sectors, int *pnum);

    int (*bdrv_set_key)(BlockDriverState *bs, const char *key);

    int (*bdrv_make_empty)(BlockDriverState *bs);

    /* aio */

    BlockDriverAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs,

        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,

        BlockDriverCompletionFunc *cb, void *opaque);

    BlockDriverAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs,

        int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,

        BlockDriverCompletionFunc *cb, void *opaque);

    void (*bdrv_aio_cancel)(BlockDriverAIOCB *acb);

    int aiocb_size;

    const char *protocol_name;

    int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset);

    int64_t (*bdrv_getlength)(BlockDriverState *bs);

    int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,

                                 const uint8_t *buf, int nb_sectors);

    int (*bdrv_snapshot_create)(BlockDriverState *bs,

                                QEMUSnapshotInfo *sn_info);

    int (*bdrv_snapshot_goto)(BlockDriverState *bs,

                              const char *snapshot_id);

    int (*bdrv_snapshot_delete)(BlockDriverState *bs, const char *snapshot_id);

    int (*bdrv_snapshot_list)(BlockDriverState *bs,

                              QEMUSnapshotInfo **psn_info);

    int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);

    int (*bdrv_put_buffer)(BlockDriverState *bs, const uint8_t *buf,

                           int64_t pos, int size);

    int (*bdrv_get_buffer)(BlockDriverState *bs, uint8_t *buf,

                           int64_t pos, int size);

    /* removable device specific */

    int (*bdrv_is_inserted)(BlockDriverState *bs);

    int (*bdrv_media_changed)(BlockDriverState *bs);

    int (*bdrv_eject)(BlockDriverState *bs, int eject_flag);

    int (*bdrv_set_locked)(BlockDriverState *bs, int locked);

    /* to control generic scsi devices */

    int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf);

    BlockDriverAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs,

        unsigned long int req, void *buf,

        BlockDriverCompletionFunc *cb, void *opaque);

    AIOPool aio_pool;

    /* List of options for creating images, terminated by name == NULL */

    QEMUOptionParameter *create_options;

    /* Returns number of errors in image, -errno for internal errors */

    int (*bdrv_check)(BlockDriverState* bs);

    struct BlockDriver *next;

};

struct BlockDriverState {

    int64_t total_sectors; /* if we are reading a disk image, give its

                              size in sectors */

    int read_only; /* if true, the media is read only */

    int removable; /* if true, the media can be removed */

    int locked;    /* if true, the media cannot temporarily be ejected */

    int encrypted; /* if true, the media is encrypted */

    int valid_key; /* if true, a valid encryption key has been set */

    int sg;        /* if true, the device is a /dev/sg* */

    /* event callback when inserting/removing */

    void (*change_cb)(void *opaque);

    void *change_opaque;

    BlockDriver *drv; /* NULL means no media */

    void *opaque;

    char filename[1024];

    char backing_file[1024]; /* if non zero, the image is a diff of

                                this file image */

    char backing_format[16]; /* if non-zero and backing_file exists */

    int is_temporary;

    int media_changed;

    BlockDriverState *backing_hd;

    /* async read/write emulation */

    void *sync_aiocb;

    /* I/O stats (display with "info blockstats"). */

    uint64_t rd_bytes;

    uint64_t wr_bytes;

    uint64_t rd_ops;

    uint64_t wr_ops;

    /* Whether the disk can expand beyond total_sectors */

    int growable;

    /* the memory alignment required for the buffers handled by this driver */

    int buffer_alignment;

    /* NOTE: the following infos are only hints for real hardware

       drivers. They are not used by the block driver */

    int cyls, heads, secs, translation;

    int type;

    char device_name[32];

    BlockDriverState *next;

    void *private;

};

struct BlockDriverAIOCB {

    AIOPool *pool;

    BlockDriverState *bs;

    BlockDriverCompletionFunc *cb;

    void *opaque;

    BlockDriverAIOCB *next;

};

void get_tmp_filename(char *filename, int size);

void aio_pool_init(AIOPool *pool, int aiocb_size,

                   void (*cancel)(BlockDriverAIOCB *acb));

void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,

                   void *opaque);

void *qemu_aio_get_pool(AIOPool *pool, BlockDriverState *bs,

                        BlockDriverCompletionFunc *cb, void *opaque);

void qemu_aio_release(void *p);

void *qemu_blockalign(BlockDriverState *bs, size_t size);

extern BlockDriverState *bdrv_first;

#endif /* BLOCK_INT_H */