xen/blkback: don't keep persistent grants too long

[linux-2.6-microblaze.git] / drivers / block / xen-blkback / common.h

diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h
index ecb35fe..7bff72d 100644 (file)
--- a/drivers/block/xen-blkback/common.h
+++ b/drivers/block/xen-blkback/common.h
@@ -234,14 +234,9 @@ struct xen_vbd {
 struct backend_info;
 
 /* Number of available flags */
-#define PERSISTENT_GNT_FLAGS_SIZE      2
+#define PERSISTENT_GNT_FLAGS_SIZE      1
 /* This persistent grant is currently in use */
 #define PERSISTENT_GNT_ACTIVE          0
-/*
- * This persistent grant has been used, this flag is set when we remove the
- * PERSISTENT_GNT_ACTIVE, to know that this grant has been used recently.
- */
-#define PERSISTENT_GNT_WAS_ACTIVE      1
 
 /* Number of requests that we can fit in a ring */
 #define XEN_BLKIF_REQS_PER_PAGE                32
@@ -250,6 +245,7 @@ struct persistent_gnt {
        struct page *page;
        grant_ref_t gnt;
        grant_handle_t handle;
+       unsigned long last_used;
        DECLARE_BITMAP(flags, PERSISTENT_GNT_FLAGS_SIZE);
        struct rb_node node;
        struct list_head remove_node;