1 #ifndef _LINUX_VIRTIO_BLK_H
2 #define _LINUX_VIRTIO_BLK_H
3 #include <linux/virtio_config.h>
5 /* The ID for virtio_block */
6 #define VIRTIO_ID_BLOCK 2
9 #define VIRTIO_CONFIG_BLK_F 0x40
10 #define VIRTIO_BLK_F_BARRIER 1 /* Does host support barriers? */
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
19 /* These two define direction. */
20 #define VIRTIO_BLK_T_IN 0
21 #define VIRTIO_BLK_T_OUT 1
23 /* This bit says it's a scsi command, not an actual read or write. */
24 #define VIRTIO_BLK_T_SCSI_CMD 2
26 /* Barrier before this op. */
27 #define VIRTIO_BLK_T_BARRIER 0x80000000
29 /* This is the first element of the read scatter-gather list. */
30 struct virtio_blk_outhdr
36 /* Sector (ie. 512 byte offset) */
38 /* Where to put reply. */
42 #define VIRTIO_BLK_S_OK 0
43 #define VIRTIO_BLK_S_IOERR 1
44 #define VIRTIO_BLK_S_UNSUPP 2
46 /* This is the first element of the write scatter-gather list */
47 struct virtio_blk_inhdr
51 #endif /* _LINUX_VIRTIO_BLK_H */