diff --git a/include/linux/fs.h b/include/linux/fs.h
index 6d62267..0c89fc9 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -264,6 +264,7 @@
 #define ATTR_ATTR_FLAG	1024
 #define ATTR_KILL_SUID	2048
 #define ATTR_KILL_SGID	4096
+#define ATTR_FILE	8192
 
 /*
  * This is the Inode Attributes structure, used for notify_change().  It
@@ -283,6 +284,13 @@
 	struct timespec	ia_atime;
 	struct timespec	ia_mtime;
 	struct timespec	ia_ctime;
+
+	/*
+	 * Not an attribute, but an auxilary info for filesystems wanting to
+	 * implement an ftruncate() like method.  NOTE: filesystem should
+	 * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
+	 */
+	struct file	*ia_file;
 };
 
 /*
@@ -1288,7 +1296,7 @@
 
 /* fs/open.c */
 
-extern int do_truncate(struct dentry *, loff_t start);
+extern int do_truncate(struct dentry *, loff_t start, struct file *filp);
 extern long do_sys_open(const char __user *filename, int flags, int mode);
 extern struct file *filp_open(const char *, int, int);
 extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);