patch-1.3.50 linux/include/linux/pagemap.h

• Lines: 93
• Date: Fri Dec 22 21:05:52 1995
• Orig file: v1.3.49/linux/include/linux/pagemap.h
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.49/linux/include/linux/pagemap.h linux/include/linux/pagemap.h
@@ -0,0 +1,92 @@
+#ifndef _LINUX_PAGEMAP_H
+#define _LINUX_PAGEMAP_H
+
+/*
+ * Page-mapping primitive inline functions
+ *
+ * Copyright 1995 Linus Torvalds
+ */
+
+static inline unsigned long page_address(struct page * page)
+{
+	return PAGE_OFFSET + PAGE_SIZE*(page - mem_map);
+}
+
+#define PAGE_HASH_SIZE 257
+
+extern struct page * page_hash_table[PAGE_HASH_SIZE];
+
+static inline unsigned long _page_hashfn(struct inode * inode, unsigned long offset)
+{
+	offset ^= (unsigned long) inode;
+	return offset % PAGE_HASH_SIZE;
+}
+
+#define page_hash(inode,offset) page_hash_table[_page_hashfn(inode,offset)]
+
+static inline struct page * find_page(struct inode * inode, unsigned long offset)
+{
+	struct page *page;
+
+	for (page = page_hash(inode, offset); page ; page = page->next_hash) {
+		if (page->inode != inode)
+			continue;
+		if (page->offset != offset)
+			continue;
+		break;
+	}
+	return page;
+}
+
+static inline void remove_page_from_hash_queue(struct page * page)
+{
+	struct page **p = &page_hash(page->inode,page->offset);
+
+	if (page->next_hash)
+		page->next_hash->prev_hash = page->prev_hash;
+	if (page->prev_hash)
+		page->prev_hash->next_hash = page->next_hash;
+	if (*p == page)
+		*p = page->next_hash;
+	page->next_hash = page->prev_hash = NULL;
+}
+
+static inline void add_page_to_hash_queue(struct inode * inode, struct page * page)
+{
+	struct page **p = &page_hash(inode,page->offset);
+
+	page->prev_hash = NULL;
+	if ((page->next_hash = *p) != NULL)
+		page->next_hash->prev_hash = page;
+	*p = page;
+}
+
+static inline void remove_page_from_inode_queue(struct page * page)
+{
+	struct inode * inode = page->inode;
+
+	page->inode = NULL;
+	inode->i_nrpages--;
+	if (inode->i_pages == page)
+		inode->i_pages = page->next;
+	if (page->next)
+		page->next->prev = page->prev;
+	if (page->prev)
+		page->prev->next = page->next;
+	page->next = NULL;
+	page->prev = NULL;
+}
+
+static inline void add_page_to_inode_queue(struct inode * inode, struct page * page)
+{
+	struct page **p = &inode->i_pages;
+
+	inode->i_nrpages++;
+	page->inode = inode;
+	page->prev = NULL;
+	if ((page->next = *p) != NULL)
+		page->next->prev = page;
+	*p = page;
+}
+
+#endif