1 files changed, 51 insertions, 0 deletions

diff --git a/include/linux/virtio_blk.h b/include/linux/virtio_blk.h
new file mode 100644
index 000000000000..7bd2bce0cfd9
--- /dev/null
+++ b/include/linux/virtio_blk.h
@@ -0,0 +1,51 @@
+#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_CONFIG_BLK_F     0x40
+#define VIRTIO_BLK_F_BARRIER    1       /* Does host support barriers? */
+
+/* The capacity (in 512-byte sectors). */
+#define VIRTIO_CONFIG_BLK_F_CAPACITY    0x41
+/* The maximum segment size. */
+#define VIRTIO_CONFIG_BLK_F_SIZE_MAX    0x42
+/* The maximum number of segments. */
+#define VIRTIO_CONFIG_BLK_F_SEG_MAX     0x43
+
+/* 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;
+        /* Where to put reply. */
+        __u64 id;
+};
+
+#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 */