[PATCH] s390: New default configuration

[linux-2.6] / fs / buffer.c

diff --git a/fs/buffer.c b/fs/buffer.c
index 3dc712f29d2d60fe4bdac9d1e84a20332384fef3..8bcbac87a28c6dba2a747bd5ea60fafbd362aeaf 100644 (file)
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -3049,6 +3049,66 @@ asmlinkage long sys_bdflush(int func, long data)
        return 0;
 }
 
+/*
+ * Migration function for pages with buffers. This function can only be used
+ * if the underlying filesystem guarantees that no other references to "page"
+ * exist.
+ */
+#ifdef CONFIG_MIGRATION
+int buffer_migrate_page(struct page *newpage, struct page *page)
+{
+       struct address_space *mapping = page->mapping;
+       struct buffer_head *bh, *head;
+
+       if (!mapping)
+               return -EAGAIN;
+
+       if (!page_has_buffers(page))
+               return migrate_page(newpage, page);
+
+       head = page_buffers(page);
+
+       if (migrate_page_remove_references(newpage, page, 3))
+               return -EAGAIN;
+
+       bh = head;
+       do {
+               get_bh(bh);
+               lock_buffer(bh);
+               bh = bh->b_this_page;
+
+       } while (bh != head);
+
+       ClearPagePrivate(page);
+       set_page_private(newpage, page_private(page));
+       set_page_private(page, 0);
+       put_page(page);
+       get_page(newpage);
+
+       bh = head;
+       do {
+               set_bh_page(bh, newpage, bh_offset(bh));
+               bh = bh->b_this_page;
+
+       } while (bh != head);
+
+       SetPagePrivate(newpage);
+
+       migrate_page_copy(newpage, page);
+
+       bh = head;
+       do {
+               unlock_buffer(bh);
+               put_bh(bh);
+               bh = bh->b_this_page;
+
+       } while (bh != head);
+
+       return 0;
+}
+EXPORT_SYMBOL(buffer_migrate_page);
+#endif
+
 /*
  * Buffer-head allocation
  */