diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 8158083..f7a0758 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1039,6 +1039,7 @@
 extern void ext4_dirty_inode(struct inode *);
 extern int ext4_change_inode_journal_flag(struct inode *, int);
 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
+extern int ext4_can_truncate(struct inode *inode);
 extern void ext4_truncate (struct inode *);
 extern void ext4_set_inode_flags(struct inode *);
 extern void ext4_get_inode_flags(struct ext4_inode_info *);