virtio: add virtio disk geometry feature

[safe/jmp/linux-2.6] / include / linux / virtio_blk.h

diff --git a/include/linux/virtio_blk.h b/include/linux/virtio_blk.h
index c75a9e8..d4695a3 100644 (file)
--- a/include/linux/virtio_blk.h
+++ b/include/linux/virtio_blk.h
@@ -9,6 +9,7 @@
 #define VIRTIO_BLK_F_BARRIER   0       /* Does host support barriers? */
 #define VIRTIO_BLK_F_SIZE_MAX  1       /* Indicates maximum segment size */
 #define VIRTIO_BLK_F_SEG_MAX   2       /* Indicates maximum # of segments */
+#define VIRTIO_BLK_F_GEOMETRY  4       /* Legacy geometry available  */
 
 struct virtio_blk_config
 {
@@ -18,6 +19,12 @@ struct virtio_blk_config
        __le32 size_max;
        /* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */
        __le32 seg_max;
+       /* geometry the device (if VIRTIO_BLK_F_GEOMETRY) */
+       struct virtio_blk_geometry {
+               __le16 cylinders;
+               __u8 heads;
+               __u8 sectors;
+       } geometry;
 } __attribute__((packed));
 
 /* These two define direction. */