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_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. */
30struct 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 */
47struct virtio_blk_inhdr
48{
49 unsigned char status;
50};
51#endif /* _LINUX_VIRTIO_BLK_H */