1*4882a593Smuzhiyun /* SPDX-License-Identifier: LGPL-2.0+ WITH Linux-syscall-note */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Copyright (C) 2020 Google, Inc 4*4882a593Smuzhiyun * Copyright (C) 2020 Palmer Dabbelt <palmerdabbelt@google.com> 5*4882a593Smuzhiyun */ 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #ifndef _LINUX_DM_USER_H 8*4882a593Smuzhiyun #define _LINUX_DM_USER_H 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #include <linux/types.h> 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun /* 13*4882a593Smuzhiyun * dm-user proxies device mapper ops between the kernel and userspace. It's 14*4882a593Smuzhiyun * essentially just an RPC mechanism: all kernel calls create a request, 15*4882a593Smuzhiyun * userspace handles that with a response. Userspace obtains requests via 16*4882a593Smuzhiyun * read() and provides responses via write(). 17*4882a593Smuzhiyun * 18*4882a593Smuzhiyun * See Documentation/block/dm-user.rst for more information. 19*4882a593Smuzhiyun */ 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun #define DM_USER_REQ_MAP_READ 0 22*4882a593Smuzhiyun #define DM_USER_REQ_MAP_WRITE 1 23*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLUSH 2 24*4882a593Smuzhiyun #define DM_USER_REQ_MAP_DISCARD 3 25*4882a593Smuzhiyun #define DM_USER_REQ_MAP_SECURE_ERASE 4 26*4882a593Smuzhiyun #define DM_USER_REQ_MAP_WRITE_SAME 5 27*4882a593Smuzhiyun #define DM_USER_REQ_MAP_WRITE_ZEROES 6 28*4882a593Smuzhiyun #define DM_USER_REQ_MAP_ZONE_OPEN 7 29*4882a593Smuzhiyun #define DM_USER_REQ_MAP_ZONE_CLOSE 8 30*4882a593Smuzhiyun #define DM_USER_REQ_MAP_ZONE_FINISH 9 31*4882a593Smuzhiyun #define DM_USER_REQ_MAP_ZONE_APPEND 10 32*4882a593Smuzhiyun #define DM_USER_REQ_MAP_ZONE_RESET 11 33*4882a593Smuzhiyun #define DM_USER_REQ_MAP_ZONE_RESET_ALL 12 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_FAILFAST_DEV 0x00001 36*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_FAILFAST_TRANSPORT 0x00002 37*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_FAILFAST_DRIVER 0x00004 38*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_SYNC 0x00008 39*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_META 0x00010 40*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_PRIO 0x00020 41*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_NOMERGE 0x00040 42*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_IDLE 0x00080 43*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_INTEGRITY 0x00100 44*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_FUA 0x00200 45*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_PREFLUSH 0x00400 46*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_RAHEAD 0x00800 47*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_BACKGROUND 0x01000 48*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_NOWAIT 0x02000 49*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_CGROUP_PUNT 0x04000 50*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_NOUNMAP 0x08000 51*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_HIPRI 0x10000 52*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_DRV 0x20000 53*4882a593Smuzhiyun #define DM_USER_REQ_MAP_FLAG_SWAP 0x40000 54*4882a593Smuzhiyun 55*4882a593Smuzhiyun #define DM_USER_RESP_SUCCESS 0 56*4882a593Smuzhiyun #define DM_USER_RESP_ERROR 1 57*4882a593Smuzhiyun #define DM_USER_RESP_UNSUPPORTED 2 58*4882a593Smuzhiyun 59*4882a593Smuzhiyun struct dm_user_message { 60*4882a593Smuzhiyun __u64 seq; 61*4882a593Smuzhiyun __u64 type; 62*4882a593Smuzhiyun __u64 flags; 63*4882a593Smuzhiyun __u64 sector; 64*4882a593Smuzhiyun __u64 len; 65*4882a593Smuzhiyun __u8 buf[]; 66*4882a593Smuzhiyun }; 67*4882a593Smuzhiyun 68*4882a593Smuzhiyun #endif 69