/*

 * Generic wrapper for storage functions

 * (experimental only)

 *

 * Copyright (C) 2018-2020, Ondrej Kozina

 *

 * This file is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This file 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this file; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */

#ifndef _UTILS_STORAGE_WRAPPERS_H

#define _UTILS_STORAGE_WRAPPERS_H

struct crypt_storage_wrapper;

struct device;

struct volume_key;

struct crypt_device;

#define DISABLE_USPACE	(1 << 0)

#define DISABLE_KCAPI	(1 << 1)

#define DISABLE_DMCRYPT	(1 << 2)

#define OPEN_READONLY	(1 << 3)

typedef enum {

	NONE = 0,

	USPACE,

	DMCRYPT

} crypt_storage_wrapper_type;

int crypt_storage_wrapper_init(struct crypt_device *cd,

	struct crypt_storage_wrapper **cw,

	struct device *device,

	uint64_t data_offset,

	uint64_t iv_start,

	int sector_size,

	const char *cipher,

	struct volume_key *vk,

	uint32_t flags);

void crypt_storage_wrapper_destroy(struct crypt_storage_wrapper *cw);

/* !!! when doing 'read' or 'write' all offset values are RELATIVE to data_offset !!! */

ssize_t crypt_storage_wrapper_read(struct crypt_storage_wrapper *cw,

		off_t offset, void *buffer, size_t buffer_length);

ssize_t crypt_storage_wrapper_read_decrypt(struct crypt_storage_wrapper *cw,

		off_t offset, void *buffer, size_t buffer_length);

ssize_t crypt_storage_wrapper_decrypt(struct crypt_storage_wrapper *cw,

		off_t offset, void *buffer, size_t buffer_length);

ssize_t crypt_storage_wrapper_write(struct crypt_storage_wrapper *cw,

		off_t offset, void *buffer, size_t buffer_length);

ssize_t crypt_storage_wrapper_encrypt_write(struct crypt_storage_wrapper *cw,

		off_t offset, void *buffer, size_t buffer_length);

ssize_t crypt_storage_wrapper_encrypt(struct crypt_storage_wrapper *cw,

		off_t offset, void *buffer, size_t buffer_length);

int crypt_storage_wrapper_datasync(const struct crypt_storage_wrapper *cw);

crypt_storage_wrapper_type crypt_storage_wrapper_get_type(const struct crypt_storage_wrapper *cw);

#endif