1 /*
2  * Copyright (C) 2021 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 use bitflags::bitflags;
18 use zerocopy::AsBytes;
19 use zerocopy::FromZeroes;
20 
21 // UAPI for device mapper can be found at include/uapi/linux/dm-ioctl.h
22 
23 pub const DM_IOCTL: u8 = 0xfd;
24 
25 #[repr(u16)]
26 #[allow(non_camel_case_types)]
27 #[allow(dead_code)]
28 pub enum Cmd {
29     DM_VERSION = 0,
30     DM_REMOVE_ALL,
31     DM_LIST_DEVICES,
32     DM_DEV_CREATE,
33     DM_DEV_REMOVE,
34     DM_DEV_RENAME,
35     DM_DEV_SUSPEND,
36     DM_DEV_STATUS,
37     DM_DEV_WAIT,
38     DM_TABLE_LOAD,
39     DM_TABLE_CLEAR,
40     DM_TABLE_DEPS,
41     DM_TABLE_STATUS,
42     DM_LIST_VERSIONS,
43     DM_TARGET_MSG,
44     DM_DEV_SET_GEOMETRY,
45 }
46 
47 #[repr(C)]
48 #[derive(Copy, Clone, AsBytes, FromZeroes)]
49 pub struct DmIoctl {
50     pub version: [u32; 3],
51     pub data_size: u32,
52     pub data_start: u32,
53     pub target_count: u32,
54     pub open_count: i32,
55     pub flags: Flag,
56     pub event_nr: u32,
57     pub padding: u32,
58     pub dev: u64,
59     pub name: [u8; DM_NAME_LEN],
60     pub uuid: [u8; DM_UUID_LEN],
61     pub data: [u8; 7],
62 }
63 
64 pub const DM_VERSION_MAJOR: u32 = 4;
65 pub const DM_VERSION_MINOR: u32 = 0;
66 pub const DM_VERSION_PATCHLEVEL: u32 = 0;
67 
68 pub const DM_NAME_LEN: usize = 128;
69 pub const DM_UUID_LEN: usize = 129;
70 pub const DM_MAX_TYPE_NAME: usize = 16;
71 
72 #[repr(transparent)]
73 #[derive(Copy, Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd, AsBytes, FromZeroes)]
74 pub struct Flag(u32);
75 
76 bitflags! {
77     impl Flag: u32 {
78         const DM_READONLY_FLAG = 1 << 0;
79         const DM_SUSPEND_FLAG = 1 << 1;
80         const DM_PERSISTENT_DEV_FLAG = 1 << 3;
81         const DM_STATUS_TABLE_FLAG = 1 << 4;
82         const DM_ACTIVE_PRESENT_FLAG = 1 << 5;
83         const DM_INACTIVE_PRESENT_FLAG = 1 << 6;
84         const DM_BUFFER_FULL_FLAG = 1 << 8;
85         const DM_SKIP_BDGET_FLAG = 1 << 9;
86         const DM_SKIP_LOCKFS_FLAG = 1 << 10;
87         const DM_NOFLUSH_FLAG = 1 << 11;
88         const DM_QUERY_INACTIVE_TABLE_FLAG = 1 << 12;
89         const DM_UEVENT_GENERATED_FLAG = 1 << 13;
90         const DM_UUID_FLAG = 1 << 14;
91         const DM_SECURE_DATA_FLAG = 1 << 15;
92         const DM_DATA_OUT_FLAG = 1 << 16;
93         const DM_DEFERRED_REMOVE = 1 << 17;
94         const DM_INTERNAL_SUSPEND_FLAG = 1 << 18;
95     }
96 }
97