fscrypt_prepare_rename
err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,