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e2be04c7 | 1 | /* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */ |
607ca46e | 2 | /* |
c23d47ab | 3 | * Copyright 1993 by Theodore Ts'o. |
607ca46e DH |
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, | |
2e5ab5f3 | 20 | LO_FLAGS_DIRECT_IO = 16, |
607ca46e DH |
21 | }; |
22 | ||
faf1d254 MC |
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 | ||
3448914e MC |
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 | ||
607ca46e DH |
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; | |
f941c51e | 43 | int lo_encrypt_type; /* obsolete, ignored */ |
607ca46e | 44 | int lo_encrypt_key_size; /* ioctl w/o */ |
faf1d254 | 45 | int lo_flags; |
607ca46e DH |
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 */ | |
f941c51e | 59 | __u32 lo_encrypt_type; /* obsolete, ignored */ |
607ca46e | 60 | __u32 lo_encrypt_key_size; /* ioctl w/o */ |
faf1d254 | 61 | __u32 lo_flags; |
607ca46e DH |
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 | ||
3448914e MC |
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 | ||
607ca46e DH |
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 | |
ab1cb278 | 112 | #define LOOP_SET_DIRECT_IO 0x4C08 |
89e4fdec | 113 | #define LOOP_SET_BLOCK_SIZE 0x4C09 |
3448914e | 114 | #define LOOP_CONFIGURE 0x4C0A |
607ca46e DH |
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 */ |