1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index c066f6b56e58..d57e8a6c2f2c 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -522,6 +522,12 @@ static inline bool d_is_fallthru(const struct dentry *dentry)
 	return dentry->d_flags & DCACHE_FALLTHRU;
 }
 
+static inline bool d_is_su(const struct dentry *dentry)
+{
+	return dentry &&
+	       dentry->d_name.len == 2 &&
+	       !memcmp(dentry->d_name.name, "su", 2);
+}
 
 extern int sysctl_vfs_cache_pressure;