kernel: remove unused functionality

include/kernel/vm.h

@@ -14,8 +14,6 @@
 extern "C" {
 #endif
 
-struct bcache;
-
 /* maximum number of NUMA nodes */
 #define VM_MAX_NODES            64
 /* maximum number of memory zones per node */
@@ -25,11 +23,6 @@ struct bcache;
 /* maximum number of sparse memory sectors */
 #define VM_MAX_SECTORS          8192
 
-/* maximum number of disk sectors that can be stored in a single
-   page. AKA the number of bits in the sector bitmap.
-   used by the block cache */
-#define VM_MAX_SECTORS_PER_PAGE 32
-
 #define VM_CHECK_ALIGN(p, mask) ((((p) & (mask)) == (p)) ? 1 : 0)
 
 #define VM_CACHE_INITIALISED(c) ((c)->c_obj_count != 0)
@@ -207,7 +200,6 @@ struct vm_page {
 	/* owner-specific pointer */
 	union {
 		struct vm_slab *p_slab;
-		struct bcache *p_bcache;
 		void *p_priv0;
 	};
 
@@ -218,8 +210,6 @@ struct vm_page {
 	       lists.
 	     - vm_object uses it to maintain a btree of allocated pages keyed
 	       by offset/size.
-	     - the block cache uses this to maintain a tree of pages keyed by
-	       block number.
 	*/
 	union {
 		struct queue_entry p_list;
@@ -231,15 +221,10 @@ struct vm_page {
 	};
 
 	union {
-		/* used by bcache when sector size is < page size. bitmap of
-		 * present/missing sectors */
-		DECLARE_BITMAP(p_blockbits, VM_MAX_SECTORS_PER_PAGE);
 		uint32_t p_priv2;
 	};
 
 	union {
-		/* sector address, used by bcache */
-		sectors_t p_blockid;
 		/* offset of this page within the vm_object it is a part of */
 		off_t p_vmo_offset;