You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
61 lines
1.8 KiB
61 lines
1.8 KiB
#ifndef _LINUX_VIRTIO_BLK_H
|
|
#define _LINUX_VIRTIO_BLK_H
|
|
/* This header is BSD licensed so anyone can use the definitions to implement
|
|
* compatible drivers/servers. */
|
|
#include <linux/virtio_config.h>
|
|
|
|
/* The ID for virtio_block */
|
|
#define VIRTIO_ID_BLOCK 2
|
|
|
|
/* Feature bits */
|
|
#define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */
|
|
#define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */
|
|
#define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */
|
|
#define VIRTIO_BLK_F_GEOMETRY 4 /* Legacy geometry available */
|
|
#define VIRTIO_BLK_F_RO 5 /* Disk is read-only */
|
|
#define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/
|
|
|
|
struct virtio_blk_config
|
|
{
|
|
/* The capacity (in 512-byte sectors). */
|
|
__u64 capacity;
|
|
/* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */
|
|
__u32 size_max;
|
|
/* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */
|
|
__u32 seg_max;
|
|
/* geometry the device (if VIRTIO_BLK_F_GEOMETRY) */
|
|
struct virtio_blk_geometry {
|
|
__u16 cylinders;
|
|
__u8 heads;
|
|
__u8 sectors;
|
|
} geometry;
|
|
/* block size of device (if VIRTIO_BLK_F_BLK_SIZE) */
|
|
__u32 blk_size;
|
|
} __attribute__((packed));
|
|
|
|
/* 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;
|
|
};
|
|
|
|
/* And this is the final byte of the write scatter-gather list. */
|
|
#define VIRTIO_BLK_S_OK 0
|
|
#define VIRTIO_BLK_S_IOERR 1
|
|
#define VIRTIO_BLK_S_UNSUPP 2
|
|
#endif /* _LINUX_VIRTIO_BLK_H */
|
|
|