ANDROID: uapi: Add dm-user structure definition

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

/*

 * Copyright (C) 2020 Google, Inc

 * Copyright (C) 2020 Palmer Dabbelt <palmerdabbelt@google.com>

 */

#ifndef _LINUX_DM_USER_H

#define _LINUX_DM_USER_H

#include <linux/types.h>

/*

 * dm-user proxies device mapper ops between the kernel and userspace.  It's

 * essentially just an RPC mechanism: all kernel calls create a request,

 * userspace handles that with a response.  Userspace obtains requests via

 * read() and provides responses via write().

 *

 * See Documentation/block/dm-user.rst for more information.

 */

#define DM_USER_REQ_MAP_READ 0

#define DM_USER_REQ_MAP_WRITE 1

#define DM_USER_REQ_MAP_FLUSH 2

#define DM_USER_REQ_MAP_DISCARD 3

#define DM_USER_REQ_MAP_SECURE_ERASE 4

#define DM_USER_REQ_MAP_WRITE_SAME 5

#define DM_USER_REQ_MAP_WRITE_ZEROES 6

#define DM_USER_REQ_MAP_ZONE_OPEN 7

#define DM_USER_REQ_MAP_ZONE_CLOSE 8

#define DM_USER_REQ_MAP_ZONE_FINISH 9

#define DM_USER_REQ_MAP_ZONE_APPEND 10

#define DM_USER_REQ_MAP_ZONE_RESET 11

#define DM_USER_REQ_MAP_ZONE_RESET_ALL 12

#define DM_USER_REQ_MAP_FLAG_FAILFAST_DEV 0x00001

#define DM_USER_REQ_MAP_FLAG_FAILFAST_TRANSPORT 0x00002

#define DM_USER_REQ_MAP_FLAG_FAILFAST_DRIVER 0x00004

#define DM_USER_REQ_MAP_FLAG_SYNC 0x00008

#define DM_USER_REQ_MAP_FLAG_META 0x00010

#define DM_USER_REQ_MAP_FLAG_PRIO 0x00020

#define DM_USER_REQ_MAP_FLAG_NOMERGE 0x00040

#define DM_USER_REQ_MAP_FLAG_IDLE 0x00080

#define DM_USER_REQ_MAP_FLAG_INTEGRITY 0x00100

#define DM_USER_REQ_MAP_FLAG_FUA 0x00200

#define DM_USER_REQ_MAP_FLAG_PREFLUSH 0x00400

#define DM_USER_REQ_MAP_FLAG_RAHEAD 0x00800

#define DM_USER_REQ_MAP_FLAG_BACKGROUND 0x01000

#define DM_USER_REQ_MAP_FLAG_NOWAIT 0x02000

#define DM_USER_REQ_MAP_FLAG_CGROUP_PUNT 0x04000

#define DM_USER_REQ_MAP_FLAG_NOUNMAP 0x08000

#define DM_USER_REQ_MAP_FLAG_HIPRI 0x10000

#define DM_USER_REQ_MAP_FLAG_DRV 0x20000

#define DM_USER_REQ_MAP_FLAG_SWAP 0x40000

#define DM_USER_RESP_SUCCESS 0

#define DM_USER_RESP_ERROR 1

#define DM_USER_RESP_UNSUPPORTED 2

struct dm_user_message {

	__u64 seq;

	__u64 type;

	__u64 flags;

	__u64 sector;

	__u64 len;

	__u8 buf[];

};

#endif