[deliverable/linux.git] / include / linux / virtio_blk.h

#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 */
Commit	Line	Data
e467cde2 RR	1	#ifndef _LINUX_VIRTIO_BLK_H
	2	#define _LINUX_VIRTIO_BLK_H
	3	#include <linux/virtio_config.h>
	4
	5	/* The ID for virtio_block */
	6	#define VIRTIO_ID_BLOCK 2
	7
	8	/* Feature bits */
	9	#define VIRTIO_CONFIG_BLK_F 0x40
	10	#define VIRTIO_BLK_F_BARRIER 1 /* Does host support barriers? */
	11
	12	/* The capacity (in 512-byte sectors). */
	13	#define VIRTIO_CONFIG_BLK_F_CAPACITY 0x41
	14	/* The maximum segment size. */
	15	#define VIRTIO_CONFIG_BLK_F_SIZE_MAX 0x42
	16	/* The maximum number of segments. */
	17	#define VIRTIO_CONFIG_BLK_F_SEG_MAX 0x43
	18
	19	/* These two define direction. */
	20	#define VIRTIO_BLK_T_IN 0
	21	#define VIRTIO_BLK_T_OUT 1
	22
	23	/* This bit says it's a scsi command, not an actual read or write. */
	24	#define VIRTIO_BLK_T_SCSI_CMD 2
	25
	26	/* Barrier before this op. */
	27	#define VIRTIO_BLK_T_BARRIER 0x80000000
	28
	29	/* This is the first element of the read scatter-gather list. */
	30	struct virtio_blk_outhdr
	31	{
	32	/* VIRTIO_BLK_T* */
	33	__u32 type;
	34	/* io priority. */
	35	__u32 ioprio;
	36	/* Sector (ie. 512 byte offset) */
	37	__u64 sector;
	38	/* Where to put reply. */
	39	__u64 id;
	40	};
	41
	42	#define VIRTIO_BLK_S_OK 0
	43	#define VIRTIO_BLK_S_IOERR 1
	44	#define VIRTIO_BLK_S_UNSUPP 2
	45
	46	/* This is the first element of the write scatter-gather list */
	47	struct virtio_blk_inhdr
	48	{
	49	unsigned char status;
	50	};
	51	#endif /* _LINUX_VIRTIO_BLK_H */