Remove unneeded version.h includes from drivers/block/

[pandora-kernel.git] / drivers / block / xen-blkback / common.h

diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h
index da96e3e..0d04c7f 100644 (file)
--- a/drivers/block/xen-blkback/common.h
+++ b/drivers/block/xen-blkback/common.h
@@ -24,10 +24,9 @@
  * IN THE SOFTWARE.
  */
 
-#ifndef __BLKIF__BACKEND__COMMON_H__
-#define __BLKIF__BACKEND__COMMON_H__
+#ifndef __XEN_BLKIF__BACKEND__COMMON_H__
+#define __XEN_BLKIF__BACKEND__COMMON_H__
 
-#include <linux/version.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/slab.h>
@@ -38,16 +37,82 @@
 #include <asm/setup.h>
 #include <asm/pgalloc.h>
 #include <asm/hypervisor.h>
-#include <xen/blkif.h>
 #include <xen/grant_table.h>
 #include <xen/xenbus.h>
+#include <xen/interface/io/ring.h>
+#include <xen/interface/io/blkif.h>
+#include <xen/interface/io/protocols.h>
 
 #define DRV_PFX "xen-blkback:"
 #define DPRINTK(fmt, args...)                          \
        pr_debug(DRV_PFX "(%s:%d) " fmt ".\n",  \
                 __func__, __LINE__, ##args)
 
-struct vbd {
+
+/* Not a real protocol.  Used to generate ring structs which contain
+ * the elements common to all protocols only.  This way we get a
+ * compiler-checkable way to use common struct elements, so we can
+ * avoid using switch(protocol) in a number of places.  */
+struct blkif_common_request {
+       char dummy;
+};
+struct blkif_common_response {
+       char dummy;
+};
+
+/* i386 protocol version */
+#pragma pack(push, 4)
+struct blkif_x86_32_request {
+       uint8_t        operation;    /* BLKIF_OP_???                         */
+       uint8_t        nr_segments;  /* number of segments                   */
+       blkif_vdev_t   handle;       /* only for read/write requests         */
+       uint64_t       id;           /* private guest value, echoed in resp  */
+       blkif_sector_t sector_number;/* start sector idx on disk (r/w only)  */
+       struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
+};
+struct blkif_x86_32_response {
+       uint64_t        id;              /* copied from request */
+       uint8_t         operation;       /* copied from request */
+       int16_t         status;          /* BLKIF_RSP_???       */
+};
+#pragma pack(pop)
+
+/* x86_64 protocol version */
+struct blkif_x86_64_request {
+       uint8_t        operation;    /* BLKIF_OP_???                         */
+       uint8_t        nr_segments;  /* number of segments                   */
+       blkif_vdev_t   handle;       /* only for read/write requests         */
+       uint64_t       __attribute__((__aligned__(8))) id;
+       blkif_sector_t sector_number;/* start sector idx on disk (r/w only)  */
+       struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
+};
+struct blkif_x86_64_response {
+       uint64_t       __attribute__((__aligned__(8))) id;
+       uint8_t         operation;       /* copied from request */
+       int16_t         status;          /* BLKIF_RSP_???       */
+};
+
+DEFINE_RING_TYPES(blkif_common, struct blkif_common_request,
+                 struct blkif_common_response);
+DEFINE_RING_TYPES(blkif_x86_32, struct blkif_x86_32_request,
+                 struct blkif_x86_32_response);
+DEFINE_RING_TYPES(blkif_x86_64, struct blkif_x86_64_request,
+                 struct blkif_x86_64_response);
+
+union blkif_back_rings {
+       struct blkif_back_ring        native;
+       struct blkif_common_back_ring common;
+       struct blkif_x86_32_back_ring x86_32;
+       struct blkif_x86_64_back_ring x86_64;
+};
+
+enum blkif_protocol {
+       BLKIF_PROTOCOL_NATIVE = 1,
+       BLKIF_PROTOCOL_X86_32 = 2,
+       BLKIF_PROTOCOL_X86_64 = 3,
+};
+
+struct xen_vbd {
        /* What the domain refers to this vbd as. */
        blkif_vdev_t            handle;
        /* Non-zero -> read-only */
@@ -64,7 +129,7 @@ struct vbd {
 
 struct backend_info;
 
-struct blkif_st {
+struct xen_blkif {
        /* Unique identifier for this interface. */
        domid_t                 domid;
        unsigned int            handle;
@@ -75,7 +140,7 @@ struct blkif_st {
        union blkif_back_rings  blk_rings;
        struct vm_struct        *blk_ring_area;
        /* The VBD attached to this interface. */
-       struct vbd              vbd;
+       struct xen_vbd          vbd;
        /* Back pointer to the backend_info. */
        struct backend_info     *be;
        /* Private fields. */
@@ -132,4 +197,36 @@ int xen_blkbk_flush_diskcache(struct xenbus_transaction xbt,
 
 struct xenbus_device *xen_blkbk_xenbus(struct backend_info *be);
 
-#endif /* __BLKIF__BACKEND__COMMON_H__ */
+static inline void blkif_get_x86_32_req(struct blkif_request *dst,
+                                       struct blkif_x86_32_request *src)
+{
+       int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
+       dst->operation = src->operation;
+       dst->nr_segments = src->nr_segments;
+       dst->handle = src->handle;
+       dst->id = src->id;
+       dst->u.rw.sector_number = src->sector_number;
+       barrier();
+       if (n > dst->nr_segments)
+               n = dst->nr_segments;
+       for (i = 0; i < n; i++)
+               dst->u.rw.seg[i] = src->seg[i];
+}
+
+static inline void blkif_get_x86_64_req(struct blkif_request *dst,
+                                       struct blkif_x86_64_request *src)
+{
+       int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
+       dst->operation = src->operation;
+       dst->nr_segments = src->nr_segments;
+       dst->handle = src->handle;
+       dst->id = src->id;
+       dst->u.rw.sector_number = src->sector_number;
+       barrier();
+       if (n > dst->nr_segments)
+               n = dst->nr_segments;
+       for (i = 0; i < n; i++)
+               dst->u.rw.seg[i] = src->seg[i];
+}
+
+#endif /* __XEN_BLKIF__BACKEND__COMMON_H__ */