/* SPDX-License-Identifier: LGPL-2.0+ WITH Linux-syscall-note */
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/*
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* Copyright (C) 2020 Google, Inc
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* Copyright (C) 2020 Palmer Dabbelt <palmerdabbelt@google.com>
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*/
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#ifndef _LINUX_DM_USER_H
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#define _LINUX_DM_USER_H
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#include <linux/types.h>
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/*
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* dm-user proxies device mapper ops between the kernel and userspace. It's
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* essentially just an RPC mechanism: all kernel calls create a request,
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* userspace handles that with a response. Userspace obtains requests via
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* read() and provides responses via write().
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*
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* See Documentation/block/dm-user.rst for more information.
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*/
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#define DM_USER_REQ_MAP_READ 0
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#define DM_USER_REQ_MAP_WRITE 1
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#define DM_USER_REQ_MAP_FLUSH 2
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#define DM_USER_REQ_MAP_DISCARD 3
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#define DM_USER_REQ_MAP_SECURE_ERASE 4
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#define DM_USER_REQ_MAP_WRITE_SAME 5
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#define DM_USER_REQ_MAP_WRITE_ZEROES 6
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#define DM_USER_REQ_MAP_ZONE_OPEN 7
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#define DM_USER_REQ_MAP_ZONE_CLOSE 8
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#define DM_USER_REQ_MAP_ZONE_FINISH 9
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#define DM_USER_REQ_MAP_ZONE_APPEND 10
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#define DM_USER_REQ_MAP_ZONE_RESET 11
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#define DM_USER_REQ_MAP_ZONE_RESET_ALL 12
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#define DM_USER_REQ_MAP_FLAG_FAILFAST_DEV 0x00001
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#define DM_USER_REQ_MAP_FLAG_FAILFAST_TRANSPORT 0x00002
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#define DM_USER_REQ_MAP_FLAG_FAILFAST_DRIVER 0x00004
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#define DM_USER_REQ_MAP_FLAG_SYNC 0x00008
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#define DM_USER_REQ_MAP_FLAG_META 0x00010
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#define DM_USER_REQ_MAP_FLAG_PRIO 0x00020
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#define DM_USER_REQ_MAP_FLAG_NOMERGE 0x00040
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#define DM_USER_REQ_MAP_FLAG_IDLE 0x00080
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#define DM_USER_REQ_MAP_FLAG_INTEGRITY 0x00100
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#define DM_USER_REQ_MAP_FLAG_FUA 0x00200
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#define DM_USER_REQ_MAP_FLAG_PREFLUSH 0x00400
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#define DM_USER_REQ_MAP_FLAG_RAHEAD 0x00800
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#define DM_USER_REQ_MAP_FLAG_BACKGROUND 0x01000
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#define DM_USER_REQ_MAP_FLAG_NOWAIT 0x02000
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#define DM_USER_REQ_MAP_FLAG_CGROUP_PUNT 0x04000
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#define DM_USER_REQ_MAP_FLAG_NOUNMAP 0x08000
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#define DM_USER_REQ_MAP_FLAG_HIPRI 0x10000
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#define DM_USER_REQ_MAP_FLAG_DRV 0x20000
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#define DM_USER_REQ_MAP_FLAG_SWAP 0x40000
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#define DM_USER_RESP_SUCCESS 0
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#define DM_USER_RESP_ERROR 1
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#define DM_USER_RESP_UNSUPPORTED 2
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struct dm_user_message {
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__u64 seq;
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__u64 type;
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__u64 flags;
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__u64 sector;
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__u64 len;
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__u8 buf[];
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};
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#endif
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