52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
#ifndef _LINUX_VIRTIO_BLK_H
|
|
#define _LINUX_VIRTIO_BLK_H
|
|
#include <linux/virtio_config.h>
|
|
|
|
/* The ID for virtio_block */
|
|
#define VIRTIO_ID_BLOCK 2
|
|
|
|
/* Feature bits */
|
|
#define VIRTIO_CONFIG_BLK_F 0x40
|
|
#define VIRTIO_BLK_F_BARRIER 1 /* Does host support barriers? */
|
|
|
|
/* The capacity (in 512-byte sectors). */
|
|
#define VIRTIO_CONFIG_BLK_F_CAPACITY 0x41
|
|
/* The maximum segment size. */
|
|
#define VIRTIO_CONFIG_BLK_F_SIZE_MAX 0x42
|
|
/* The maximum number of segments. */
|
|
#define VIRTIO_CONFIG_BLK_F_SEG_MAX 0x43
|
|
|
|
/* These two define direction. */
|
|
#define VIRTIO_BLK_T_IN 0
|
|
#define VIRTIO_BLK_T_OUT 1
|
|
|
|
/* This bit says it's a scsi command, not an actual read or write. */
|
|
#define VIRTIO_BLK_T_SCSI_CMD 2
|
|
|
|
/* Barrier before this op. */
|
|
#define VIRTIO_BLK_T_BARRIER 0x80000000
|
|
|
|
/* This is the first element of the read scatter-gather list. */
|
|
struct virtio_blk_outhdr
|
|
{
|
|
/* VIRTIO_BLK_T* */
|
|
__u32 type;
|
|
/* io priority. */
|
|
__u32 ioprio;
|
|
/* Sector (ie. 512 byte offset) */
|
|
__u64 sector;
|
|
/* Where to put reply. */
|
|
__u64 id;
|
|
};
|
|
|
|
#define VIRTIO_BLK_S_OK 0
|
|
#define VIRTIO_BLK_S_IOERR 1
|
|
#define VIRTIO_BLK_S_UNSUPP 2
|
|
|
|
/* This is the first element of the write scatter-gather list */
|
|
struct virtio_blk_inhdr
|
|
{
|
|
unsigned char status;
|
|
};
|
|
#endif /* _LINUX_VIRTIO_BLK_H */
|