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

#ifndef _LINUX_CACHEFILES_H

#define _LINUX_CACHEFILES_H

#include <linux/types.h>

#include <linux/ioctl.h>

/*

* Fscache ensures that the maximum length of cookie key is 255. The volume key

* is controlled by netfs, and generally no bigger than 255.

*/

#define CACHEFILES_MSG_MAX_SIZE 1024

enum cachefiles_opcode {

CACHEFILES_OP_OPEN,

CACHEFILES_OP_CLOSE,

CACHEFILES_OP_READ,

};

/*

* Message Header

*

* @msg_id a unique ID identifying this message

* @opcode message type, CACHEFILE_OP_*

* @len message length, including message header and following data

* @object_id a unique ID identifying a cache file

* @data message type specific payload

*/

struct cachefiles_msg {

__u32 msg_id;

__u32 opcode;

__u32 len;

__u32 object_id;

__u8 data[];

};

/*

* @data contains the volume_key followed directly by the cookie_key. volume_key

* is a NUL-terminated string; @volume_key_size indicates the size of the volume

* key in bytes. cookie_key is binary data, which is netfs specific;

* @cookie_key_size indicates the size of the cookie key in bytes.

*

* @fd identifies an anon_fd referring to the cache file.

*/

struct cachefiles_open {

__u32 volume_key_size;

__u32 cookie_key_size;

__u32 fd;

__u32 flags;

__u8 data[];

};

/*

* @off indicates the starting offset of the requested file range

* @len indicates the length of the requested file range

*/

struct cachefiles_read {

__u64 off;

__u64 len;

};

/*

* Reply for READ request

* @arg for this ioctl is the @id field of READ request.

*/

#define CACHEFILES_IOC_READ_COMPLETE _IOW(0x98, 1, int)

#endif