Linux kernel mirror (for testing)
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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_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
13struct 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));
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. */
34struct 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;
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 */
49struct virtio_blk_inhdr
50{
51 unsigned char status;
52};
53#endif /* _LINUX_VIRTIO_BLK_H */