#ifndef BLOCK_H#define BLOCK_H/* block.c */typedef struct BlockDriver BlockDriver;extern BlockDriver bdrv_raw;extern BlockDriver bdrv_host_device;extern BlockDriver bdrv_cow;extern BlockDriver bdrv_qcow;extern BlockDriver bdrv_vmdk;extern BlockDriver bdrv_cloop;extern BlockDriver bdrv_dmg;extern BlockDriver bdrv_bochs;extern BlockDriver bdrv_vpc;extern BlockDriver bdrv_vvfat;extern BlockDriver bdrv_qcow2;extern BlockDriver bdrv_parallels;typedef struct BlockDriverInfo {    /* in bytes, 0 if irrelevant */    int cluster_size;    /* offset at which the VM state can be saved (0 if not possible) */    int64_t vm_state_offset;} BlockDriverInfo;typedef struct QEMUSnapshotInfo {    char id_str[128]; /* unique snapshot id */    /* the following fields are informative. They are not needed for       the consistency of the snapshot */    char name[256]; /* user choosen name */    uint32_t vm_state_size; /* VM state info size */    uint32_t date_sec; /* UTC date of the snapshot */    uint32_t date_nsec;    uint64_t vm_clock_nsec; /* VM clock relative to boot */} QEMUSnapshotInfo;#define BDRV_O_RDONLY      0x0000#define BDRV_O_RDWR        0x0002#define BDRV_O_ACCESS      0x0003#define BDRV_O_CREAT       0x0004 /* create an empty file */#define BDRV_O_SNAPSHOT    0x0008 /* open the file read only and save writes in a snapshot */#define BDRV_O_FILE        0x0010 /* open as a raw file (do not try to                                     use a disk image format on top of                                     it (default for                                     bdrv_file_open()) */#define BDRV_O_DIRECT      0x0020#ifndef QEMU_IMGvoid bdrv_info(void);void bdrv_info_stats(void);#endifvoid bdrv_init(void);BlockDriver *bdrv_find_format(const char *format_name);int bdrv_create(BlockDriver *drv,                const char *filename, int64_t size_in_sectors,                const char *backing_file, int flags);BlockDriverState *bdrv_new(const char *device_name);void bdrv_delete(BlockDriverState *bs);int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags);int bdrv_open(BlockDriverState *bs, const char *filename, int flags);int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,               BlockDriver *drv);void bdrv_close(BlockDriverState *bs);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);int bdrv_pread(BlockDriverState *bs, int64_t offset,               void *buf, int count);int bdrv_pwrite(BlockDriverState *bs, int64_t offset,                const void *buf, int count);int bdrv_truncate(BlockDriverState *bs, int64_t offset);int64_t bdrv_getlength(BlockDriverState *bs);void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);int bdrv_commit(BlockDriverState *bs);void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size);/* async block I/O */typedef struct BlockDriverAIOCB BlockDriverAIOCB;typedef void BlockDriverCompletionFunc(void *opaque, int ret);BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num,                                uint8_t *buf, int nb_sectors,                                BlockDriverCompletionFunc *cb, void *opaque);BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,                                 const uint8_t *buf, int nb_sectors,                                 BlockDriverCompletionFunc *cb, void *opaque);void bdrv_aio_cancel(BlockDriverAIOCB *acb);void qemu_aio_init(void);void qemu_aio_poll(void);void qemu_aio_flush(void);void qemu_aio_wait_start(void);void qemu_aio_wait(void);void qemu_aio_wait_end(void);int qemu_key_check(BlockDriverState *bs, const char *name);/* Ensure contents are flushed to disk.  */void bdrv_flush(BlockDriverState *bs);#define BDRV_TYPE_HD     0#define BDRV_TYPE_CDROM  1#define BDRV_TYPE_FLOPPY 2#define BIOS_ATA_TRANSLATION_AUTO   0#define BIOS_ATA_TRANSLATION_NONE   1#define BIOS_ATA_TRANSLATION_LBA    2#define BIOS_ATA_TRANSLATION_LARGE  3#define BIOS_ATA_TRANSLATION_RECHS  4void bdrv_set_geometry_hint(BlockDriverState *bs,                            int cyls, int heads, int secs);void bdrv_set_type_hint(BlockDriverState *bs, int type);void bdrv_set_translation_hint(BlockDriverState *bs, int translation);void bdrv_get_geometry_hint(BlockDriverState *bs,                            int *pcyls, int *pheads, int *psecs);int bdrv_get_type_hint(BlockDriverState *bs);int bdrv_get_translation_hint(BlockDriverState *bs);int bdrv_is_removable(BlockDriverState *bs);int bdrv_is_read_only(BlockDriverState *bs);int bdrv_is_sg(BlockDriverState *bs);int bdrv_is_inserted(BlockDriverState *bs);int bdrv_media_changed(BlockDriverState *bs);int bdrv_is_locked(BlockDriverState *bs);void bdrv_set_locked(BlockDriverState *bs, int locked);void bdrv_eject(BlockDriverState *bs, int eject_flag);void bdrv_set_change_cb(BlockDriverState *bs,                        void (*change_cb)(void *opaque), void *opaque);void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size);BlockDriverState *bdrv_find(const char *name);void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque);int bdrv_is_encrypted(BlockDriverState *bs);int bdrv_set_key(BlockDriverState *bs, const char *key);void bdrv_iterate_format(void (*it)(void *opaque, const char *name),                         void *opaque);const char *bdrv_get_device_name(BlockDriverState *bs);int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,                          const uint8_t *buf, int nb_sectors);int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);void bdrv_get_backing_filename(BlockDriverState *bs,                               char *filename, int filename_size);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);char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn);int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);char *get_human_readable_size(char *buf, int buf_size, int64_t size);int path_is_absolute(const char *path);void path_combine(char *dest, int dest_size,                  const char *base_path,                  const char *filename);#endif