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
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));
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;
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 */
54
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