diff -urN linux.orig/include/linux/fs.h linux.diff/include/linux/fs.h
--- linux.orig/include/linux/fs.h	Tue Jan 15 04:36:58 2002
+++ linux.diff/include/linux/fs.h	Tue Jan 15 22:30:26 2002
@@ -839,6 +839,10 @@
 	ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *);
 	ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
 	unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
+
+	/* in-kernel fully async api */
+	int (*kvec_read)(struct file *, kvec_cb_t, size_t, loff_t);
+	int (*kvec_write)(struct file *, kvec_cb_t, size_t, loff_t);
 };
 
 struct inode_operations {
@@ -1439,6 +1443,8 @@
 extern ssize_t generic_file_read(struct file *, char *, size_t, loff_t *);
 extern ssize_t generic_file_write(struct file *, const char *, size_t, loff_t *);
 extern void do_generic_file_read(struct file *, loff_t *, read_descriptor_t *, read_actor_t, int);
+extern int generic_file_kvec_read(struct file *file, kvec_cb_t cb, size_t size, loff_t pos);
+extern int generic_file_kvec_write(struct file *file, kvec_cb_t cb, size_t size, loff_t pos);
 
 extern ssize_t generic_read_dir(struct file *, char *, size_t, loff_t *);
 extern loff_t generic_file_llseek(struct file *, loff_t, int);