block: xen-blkback: use API provided by xenbus module to map rings

The xenbus module provides xenbus_map_ring_valloc() and
xenbus_map_ring_vfree().  Use these to map the ring pages granted by
the frontend.

Acked-by: Jens Axboe <jaxboe@fusionio.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

1 files changed, 1 insertions, 4 deletions

diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h
index 00c57c90e2d6..7ec0e8896a78 100644
--- a/drivers/block/xen-blkback/common.h
+++ b/drivers/block/xen-blkback/common.h
@@ -139,7 +139,7 @@ struct xen_blkif {
         /* Comms information. */
         enum blkif_protocol     blk_protocol;
         union blkif_back_rings  blk_rings;
-        struct vm_struct        *blk_ring_area;
+        void                    *blk_ring;
         /* The VBD attached to this interface. */
         struct xen_vbd          vbd;
         /* Back pointer to the backend_info. */
@@ -163,9 +163,6 @@ struct xen_blkif {
         int                     st_wr_sect;
 
         wait_queue_head_t       waiting_to_free;
-
-        grant_handle_t          shmem_handle;
-        grant_ref_t             shmem_ref;
 };