fs/ext4/ext4_ice.h

/* Copyright (c) 2017, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#ifndef _EXT4_ICE_H
#define _EXT4_ICE_H

#include "ext4.h"
#include <linux/fscrypto.h>

#ifdef CONFIG_EXT4_FS_ICE_ENCRYPTION
static inline int ext4_should_be_processed_by_ice(const struct inode *inode)
{
	if (!ext4_encrypted_inode((struct inode *)inode))
		return 0;

	return fs_using_hardware_encryption((struct inode *)inode);
}

static inline int ext4_is_ice_enabled(void)
{
	return 1;
}

int ext4_is_aes_xts_cipher(const struct inode *inode);

char *ext4_get_ice_encryption_key(const struct inode *inode);
char *ext4_get_ice_encryption_salt(const struct inode *inode);

int ext4_is_ice_encryption_info_equal(const struct inode *inode1,
	const struct inode *inode2);

static inline size_t ext4_get_ice_encryption_key_size(
	const struct inode *inode)
{
	return FS_AES_256_XTS_KEY_SIZE / 2;
}

static inline size_t ext4_get_ice_encryption_salt_size(
	const struct inode *inode)
{
	return FS_AES_256_XTS_KEY_SIZE / 2;
}

#else
static inline int ext4_should_be_processed_by_ice(const struct inode *inode)
{
	return 0;
}
static inline int ext4_is_ice_enabled(void)
{
	return 0;
}

static inline char *ext4_get_ice_encryption_key(const struct inode *inode)
{
	return NULL;
}

static inline char *ext4_get_ice_encryption_salt(const struct inode *inode)
{
	return NULL;
}

static inline size_t ext4_get_ice_encryption_key_size(
	const struct inode *inode)
{
	return 0;
}

static inline size_t ext4_get_ice_encryption_salt_size(
	const struct inode *inode)
{
	return 0;
}

static inline int ext4_is_xts_cipher(const struct inode *inode)
{
	return 0;
}

static inline int ext4_is_ice_encryption_info_equal(
	const struct inode *inode1,
	const struct inode *inode2)
{
	return 0;
}

static inline int ext4_is_aes_xts_cipher(const struct inode *inode)
{
	return 0;
}

#endif

#endif	/* _EXT4_ICE_H */