1 | /* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */ |
2 | /* |
3 | * Copyright 1993 by Theodore Ts'o. |
4 | */ |
5 | #ifndef _UAPI_LINUX_LOOP_H |
6 | #define _UAPI_LINUX_LOOP_H |
7 | |
8 | |
9 | #define LO_NAME_SIZE 64 |
10 | #define LO_KEY_SIZE 32 |
11 | |
12 | |
13 | /* |
14 | * Loop flags |
15 | */ |
16 | enum { |
17 | LO_FLAGS_READ_ONLY = 1, |
18 | LO_FLAGS_AUTOCLEAR = 4, |
19 | LO_FLAGS_PARTSCAN = 8, |
20 | LO_FLAGS_DIRECT_IO = 16, |
21 | }; |
22 | |
23 | /* LO_FLAGS that can be set using LOOP_SET_STATUS(64) */ |
24 | #define LOOP_SET_STATUS_SETTABLE_FLAGS (LO_FLAGS_AUTOCLEAR | LO_FLAGS_PARTSCAN) |
25 | |
26 | /* LO_FLAGS that can be cleared using LOOP_SET_STATUS(64) */ |
27 | #define LOOP_SET_STATUS_CLEARABLE_FLAGS (LO_FLAGS_AUTOCLEAR) |
28 | |
29 | /* LO_FLAGS that can be set using LOOP_CONFIGURE */ |
30 | #define LOOP_CONFIGURE_SETTABLE_FLAGS (LO_FLAGS_READ_ONLY | LO_FLAGS_AUTOCLEAR \ |
31 | | LO_FLAGS_PARTSCAN | LO_FLAGS_DIRECT_IO) |
32 | |
33 | #include <asm/posix_types.h> /* for __kernel_old_dev_t */ |
34 | #include <linux/types.h> /* for __u64 */ |
35 | |
36 | /* Backwards compatibility version */ |
37 | struct loop_info { |
38 | int lo_number; /* ioctl r/o */ |
39 | __kernel_old_dev_t lo_device; /* ioctl r/o */ |
40 | unsigned long lo_inode; /* ioctl r/o */ |
41 | __kernel_old_dev_t lo_rdevice; /* ioctl r/o */ |
42 | int lo_offset; |
43 | int lo_encrypt_type; /* obsolete, ignored */ |
44 | int lo_encrypt_key_size; /* ioctl w/o */ |
45 | int lo_flags; |
46 | char lo_name[LO_NAME_SIZE]; |
47 | unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ |
48 | unsigned long lo_init[2]; |
49 | char reserved[4]; |
50 | }; |
51 | |
52 | struct loop_info64 { |
53 | __u64 lo_device; /* ioctl r/o */ |
54 | __u64 lo_inode; /* ioctl r/o */ |
55 | __u64 lo_rdevice; /* ioctl r/o */ |
56 | __u64 lo_offset; |
57 | __u64 lo_sizelimit;/* bytes, 0 == max available */ |
58 | __u32 lo_number; /* ioctl r/o */ |
59 | __u32 lo_encrypt_type; /* obsolete, ignored */ |
60 | __u32 lo_encrypt_key_size; /* ioctl w/o */ |
61 | __u32 lo_flags; |
62 | __u8 lo_file_name[LO_NAME_SIZE]; |
63 | __u8 lo_crypt_name[LO_NAME_SIZE]; |
64 | __u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ |
65 | __u64 lo_init[2]; |
66 | }; |
67 | |
68 | /** |
69 | * struct loop_config - Complete configuration for a loop device. |
70 | * @fd: fd of the file to be used as a backing file for the loop device. |
71 | * @block_size: block size to use; ignored if 0. |
72 | * @info: struct loop_info64 to configure the loop device with. |
73 | * |
74 | * This structure is used with the LOOP_CONFIGURE ioctl, and can be used to |
75 | * atomically setup and configure all loop device parameters at once. |
76 | */ |
77 | struct loop_config { |
78 | __u32 fd; |
79 | __u32 block_size; |
80 | struct loop_info64 info; |
81 | __u64 __reserved[8]; |
82 | }; |
83 | |
84 | /* |
85 | * Loop filter types |
86 | */ |
87 | |
88 | #define LO_CRYPT_NONE 0 |
89 | #define LO_CRYPT_XOR 1 |
90 | #define LO_CRYPT_DES 2 |
91 | #define LO_CRYPT_FISH2 3 /* Twofish encryption */ |
92 | #define LO_CRYPT_BLOW 4 |
93 | #define LO_CRYPT_CAST128 5 |
94 | #define LO_CRYPT_IDEA 6 |
95 | #define LO_CRYPT_DUMMY 9 |
96 | #define LO_CRYPT_SKIPJACK 10 |
97 | #define LO_CRYPT_CRYPTOAPI 18 |
98 | #define MAX_LO_CRYPT 20 |
99 | |
100 | /* |
101 | * IOCTL commands --- we will commandeer 0x4C ('L') |
102 | */ |
103 | |
104 | #define LOOP_SET_FD 0x4C00 |
105 | #define LOOP_CLR_FD 0x4C01 |
106 | #define LOOP_SET_STATUS 0x4C02 |
107 | #define LOOP_GET_STATUS 0x4C03 |
108 | #define LOOP_SET_STATUS64 0x4C04 |
109 | #define LOOP_GET_STATUS64 0x4C05 |
110 | #define LOOP_CHANGE_FD 0x4C06 |
111 | #define LOOP_SET_CAPACITY 0x4C07 |
112 | #define LOOP_SET_DIRECT_IO 0x4C08 |
113 | #define LOOP_SET_BLOCK_SIZE 0x4C09 |
114 | #define LOOP_CONFIGURE 0x4C0A |
115 | |
116 | /* /dev/loop-control interface */ |
117 | #define LOOP_CTL_ADD 0x4C80 |
118 | #define LOOP_CTL_REMOVE 0x4C81 |
119 | #define LOOP_CTL_GET_FREE 0x4C82 |
120 | #endif /* _UAPI_LINUX_LOOP_H */ |
121 | |