patch-2.2.8 linux/include/linux/pagemap.h

• Lines: 28
• Date: Tue May 11 10:35:49 1999
• Orig file: v2.2.7/linux/include/linux/pagemap.h
• Orig date: Wed Apr 28 11:37:31 1999

diff -u --recursive --new-file v2.2.7/linux/include/linux/pagemap.h linux/include/linux/pagemap.h
@@ -17,6 +17,27 @@
 	return PAGE_OFFSET + PAGE_SIZE * (page - mem_map);
 }
 
+/*
+ * The page cache can done in larger chunks than
+ * one page, because it allows for more efficient
+ * throughput (it can then be mapped into user
+ * space in smaller chunks for same flexibility).
+ *
+ * Or rather, it _will_ be done in larger chunks.
+ */
+#define PAGE_CACHE_SHIFT	PAGE_SHIFT
+#define PAGE_CACHE_SIZE		PAGE_SIZE
+#define PAGE_CACHE_MASK		PAGE_MASK
+
+#define page_cache_alloc()	__get_free_page(GFP_USER)
+#define page_cache_free(x)	free_page(x)
+#define page_cache_release(x)	__free_page(x)
+
+/*
+ * From a kernel address, get the "struct page *"
+ */
+#define page_cache_entry(x)	(mem_map + MAP_NR(x))
+
 #define PAGE_HASH_BITS 12
 #define PAGE_HASH_SIZE (1 << PAGE_HASH_BITS)