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 */
@@ -207,7 +205,6 @@ struct vm_page {
 	/* owner-specific pointer */
 	union {
 		struct vm_slab *p_slab;
-		struct bcache *p_bcache;
 		void *p_priv0;
 	};
 
@@ -231,15 +228,10 @@ 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;