block: use normal I/O path for discard requests

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

diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
index 166c519..e4d144b 100644 (file)
--- a/include/linux/virtio_ring.h
+++ b/include/linux/virtio_ring.h
@@ -14,6 +14,8 @@
 #define VRING_DESC_F_NEXT      1
 /* This marks a buffer as write-only (otherwise read-only). */
 #define VRING_DESC_F_WRITE     2
+/* This means the buffer contains a list of buffer descriptors. */
+#define VRING_DESC_F_INDIRECT  4
 
 /* The Host uses this in used->flags to advise the Guest: don't kick me when
  * you add a buffer.  It's unreliable, so it's simply an optimization.  Guest
@@ -24,9 +26,11 @@
  * optimization.  */
 #define VRING_AVAIL_F_NO_INTERRUPT     1
 
+/* We support indirect buffer descriptors */
+#define VIRTIO_RING_F_INDIRECT_DESC    28
+
 /* Virtio ring descriptors: 16 bytes.  These can chain together via "next". */
-struct vring_desc
-{
+struct vring_desc {
        /* Address (guest-physical). */
        __u64 addr;
        /* Length. */
@@ -37,24 +41,21 @@ struct vring_desc
        __u16 next;
 };
 
-struct vring_avail
-{
+struct vring_avail {
        __u16 flags;
        __u16 idx;
        __u16 ring[];
 };
 
 /* u32 is used here for ids for padding reasons. */
-struct vring_used_elem
-{
+struct vring_used_elem {
        /* Index of start of used descriptor chain. */
        __u32 id;
        /* Total length of the descriptor chain which was used (written to) */
        __u32 len;
 };
 
-struct vring_used
-{
+struct vring_used {
        __u16 flags;
        __u16 idx;
        struct vring_used_elem ring[];