fs-verity: add UAPI header

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

/*

 * fs-verity user API

 *

 * These ioctls can be used on filesystems that support fs-verity.  See the

 * "User API" section of Documentation/filesystems/fsverity.rst.

 *

 * Copyright 2019 Google LLC

 */

#ifndef _UAPI_LINUX_FSVERITY_H

#define _UAPI_LINUX_FSVERITY_H

#include <linux/ioctl.h>

#include <linux/types.h>

#define FS_VERITY_HASH_ALG_SHA256	1

struct fsverity_enable_arg {

	__u32 version;

	__u32 hash_algorithm;

	__u32 block_size;

	__u32 salt_size;

	__u64 salt_ptr;

	__u32 sig_size;

	__u32 __reserved1;

	__u64 sig_ptr;

	__u64 __reserved2[11];

};

struct fsverity_digest {

	__u16 digest_algorithm;

	__u16 digest_size; /* input/output */

	__u8 digest[];

};

#define FS_IOC_ENABLE_VERITY	_IOW('f', 133, struct fsverity_enable_arg)

#define FS_IOC_MEASURE_VERITY	_IOWR('f', 134, struct fsverity_digest)

#endif /* _UAPI_LINUX_FSVERITY_H */