#ifndef SCSI_DISK_H#define SCSI_DISK_H/* scsi-disk.c */enum scsi_reason {    SCSI_REASON_DONE, /* Command complete.  */    SCSI_REASON_DATA  /* Transfer complete, more data required.  */};typedef struct SCSIDeviceState SCSIDeviceState;typedef struct SCSIDevice SCSIDevice;typedef void (*scsi_completionfn)(void *opaque, int reason, uint32_t tag,                                  uint32_t arg);struct SCSIDevice{    SCSIDeviceState *state;    void (*destroy)(SCSIDevice *s);    int32_t (*send_command)(SCSIDevice *s, uint32_t tag, uint8_t *buf,                            int lun);    void (*read_data)(SCSIDevice *s, uint32_t tag);    int (*write_data)(SCSIDevice *s, uint32_t tag);    void (*cancel_io)(SCSIDevice *s, uint32_t tag);    uint8_t *(*get_buf)(SCSIDevice *s, uint32_t tag);};SCSIDevice *scsi_disk_init(BlockDriverState *bdrv, int tcq,                           scsi_completionfn completion, void *opaque);SCSIDevice *scsi_generic_init(BlockDriverState *bdrv, int tcq,                           scsi_completionfn completion, void *opaque);/* cdrom.c */int cdrom_read_toc(int nb_sectors, uint8_t *buf, int msf, int start_track);int cdrom_read_toc_raw(int nb_sectors, uint8_t *buf, int msf, int session_num);#endif