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ANDROID: uapi: Add dm-user structure definition

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dm-user is a device mapper target that allows a userspace process to
handle each incoming BIO.  Communication with userspace consists of a
stream of messages proxied over a misc device, the structure of each
message is defined in this header.

Test: none
Bug: 161496058
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Change-Id: I97ca538fbd7e73e467416590190d85894db42e7d
This commit is contained in:
Palmer Dabbelt 2020-09-29 21:15:52 -07:00 committed by Alistair Delva
parent 1caf05ce90
commit 1817b1966d
1 changed files with 68 additions and 0 deletions
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68
include/uapi/linux/dm-user.h Normal file
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/* 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