ntfs_ucsnlen
if (ntfs_ucsnlen(name, name_len) != name_len) {
if (ntfs_ucsnlen(attr_name, a->name_length)
len = ntfs_ucsnlen(s, maxlen);
extern u32 ntfs_ucsnlen(const ntfschar *s, u32 maxlen);
namelen = ntfs_ucsnlen(attrdef->name, sizeof(attrdef->name));