[mirror_ubuntu-bionic-kernel.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_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 */

struct virtio_blk_config
{
	/* The capacity (in 512-byte sectors). */
	__le64 capacity;
	/* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */
	__le32 size_max;
	/* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */
	__le32 seg_max;
} __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;
};

#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 */
a586d4f6 RR	9	#define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */
	10	#define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */
	11	#define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */
	12
	13	struct virtio_blk_config
	14	{
	15	/* The capacity (in 512-byte sectors). */
	16	__le64 capacity;
	17	/* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */
	18	__le32 size_max;
	19	/* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */
	20	__le32 seg_max;
	21	} __attribute__((packed));
e467cde2 RR	22
	23	/* These two define direction. */
	24	#define VIRTIO_BLK_T_IN 0
	25	#define VIRTIO_BLK_T_OUT 1
	26
	27	/* This bit says it's a scsi command, not an actual read or write. */
	28	#define VIRTIO_BLK_T_SCSI_CMD 2
	29
	30	/* Barrier before this op. */
	31	#define VIRTIO_BLK_T_BARRIER 0x80000000
	32
	33	/* This is the first element of the read scatter-gather list. */
	34	struct virtio_blk_outhdr
	35	{
	36	/* VIRTIO_BLK_T* */
	37	__u32 type;
	38	/* io priority. */
	39	__u32 ioprio;
	40	/* Sector (ie. 512 byte offset) */
	41	__u64 sector;
e467cde2 RR	42	};
	43
	44	#define VIRTIO_BLK_S_OK 0
	45	#define VIRTIO_BLK_S_IOERR 1
	46	#define VIRTIO_BLK_S_UNSUPP 2
	47
	48	/* This is the first element of the write scatter-gather list */
	49	struct virtio_blk_inhdr
	50	{
	51	unsigned char status;
	52	};
	53	#endif /* _LINUX_VIRTIO_BLK_H */