patch-2.2.14 linux/include/linux/pagemap.h

• Lines: 34
• Date: Tue Jan 4 10:12:25 2000
• Orig file: v2.2.13/linux/include/linux/pagemap.h
• Orig date: Tue Jan 4 11:10:42 2000

diff -u --recursive --new-file v2.2.13/linux/include/linux/pagemap.h linux/include/linux/pagemap.h
@@ -38,11 +38,15 @@
  */
 #define page_cache_entry(x)	(mem_map + MAP_NR(x))
 
-#define PAGE_HASH_BITS 12
-#define PAGE_HASH_SIZE (1 << PAGE_HASH_BITS)
+#define PAGE_HASH_BITS page_hash_bits
+#define PAGE_HASH_MASK page_hash_mask
 
 extern unsigned long page_cache_size; /* # of pages currently in the hash table */
-extern struct page * page_hash_table[PAGE_HASH_SIZE];
+extern unsigned int page_hash_bits;
+extern unsigned int page_hash_mask;
+extern struct page **page_hash_table;
+
+extern void page_cache_init(unsigned long);
 
 /*
  * We use a power-of-two hash table to avoid a modulus,
@@ -53,12 +57,10 @@
 static inline unsigned long _page_hashfn(struct inode * inode, unsigned long offset)
 {
 #define i (((unsigned long) inode)/(sizeof(struct inode) & ~ (sizeof(struct inode) - 1)))
-#define o (offset >> PAGE_SHIFT)
-#define s(x) ((x)+((x)>>PAGE_HASH_BITS))
-	return s(i+o) & (PAGE_HASH_SIZE-1);
+#define o ((offset >> PAGE_SHIFT) + (offset & ~PAGE_MASK))
+	return ((i+o) & PAGE_HASH_MASK);
 #undef i
 #undef o
-#undef s
 }
 
 #define page_hash(inode,offset) (page_hash_table+_page_hashfn(inode,offset))