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1/* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */
2/*
3 * include/linux/loop.h
4 *
5 * Written by Theodore Ts'o, 3/29/93.
6 *
7 * Copyright 1993 by Theodore Ts'o. Redistribution of this file is
8 * permitted under the GNU General Public License.
9 */
10#ifndef _LINUX_LOOP_H
11#define _LINUX_LOOP_H
12
13
14#define LO_NAME_SIZE 64
15#define LO_KEY_SIZE 32
16
17
18/*
19 * Loop flags
20 */
21enum {
22 LO_FLAGS_READ_ONLY = 1,
23 LO_FLAGS_AUTOCLEAR = 4,
24 LO_FLAGS_PARTSCAN = 8,
25 LO_FLAGS_DIRECT_IO = 16,
26};
27
28#include <asm/posix_types.h> /* for __kernel_old_dev_t */
29#include <linux/types.h> /* for __u64 */
30
31/* Backwards compatibility version */
32struct loop_info {
33 int lo_number; /* ioctl r/o */
34 __kernel_old_dev_t lo_device; /* ioctl r/o */
35 unsigned long lo_inode; /* ioctl r/o */
36 __kernel_old_dev_t lo_rdevice; /* ioctl r/o */
37 int lo_offset;
38 int lo_encrypt_type;
39 int lo_encrypt_key_size; /* ioctl w/o */
40 int lo_flags; /* ioctl r/o */
41 char lo_name[LO_NAME_SIZE];
42 unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
43 unsigned long lo_init[2];
44 char reserved[4];
45};
46
47struct loop_info64 {
48 __u64 lo_device; /* ioctl r/o */
49 __u64 lo_inode; /* ioctl r/o */
50 __u64 lo_rdevice; /* ioctl r/o */
51 __u64 lo_offset;
52 __u64 lo_sizelimit;/* bytes, 0 == max available */
53 __u32 lo_number; /* ioctl r/o */
54 __u32 lo_encrypt_type;
55 __u32 lo_encrypt_key_size; /* ioctl w/o */
56 __u32 lo_flags; /* ioctl r/o */
57 __u8 lo_file_name[LO_NAME_SIZE];
58 __u8 lo_crypt_name[LO_NAME_SIZE];
59 __u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
60 __u64 lo_init[2];
61};
62
63/*
64 * Loop filter types
65 */
66
67#define LO_CRYPT_NONE 0
68#define LO_CRYPT_XOR 1
69#define LO_CRYPT_DES 2
70#define LO_CRYPT_FISH2 3 /* Twofish encryption */
71#define LO_CRYPT_BLOW 4
72#define LO_CRYPT_CAST128 5
73#define LO_CRYPT_IDEA 6
74#define LO_CRYPT_DUMMY 9
75#define LO_CRYPT_SKIPJACK 10
76#define LO_CRYPT_CRYPTOAPI 18
77#define MAX_LO_CRYPT 20
78
79/*
80 * IOCTL commands --- we will commandeer 0x4C ('L')
81 */
82
83#define LOOP_SET_FD 0x4C00
84#define LOOP_CLR_FD 0x4C01
85#define LOOP_SET_STATUS 0x4C02
86#define LOOP_GET_STATUS 0x4C03
87#define LOOP_SET_STATUS64 0x4C04
88#define LOOP_GET_STATUS64 0x4C05
89#define LOOP_CHANGE_FD 0x4C06
90#define LOOP_SET_CAPACITY 0x4C07
91#define LOOP_SET_DIRECT_IO 0x4C08
92#define LOOP_SET_BLOCK_SIZE 0x4C09
93
94/* /dev/loop-control interface */
95#define LOOP_CTL_ADD 0x4C80
96#define LOOP_CTL_REMOVE 0x4C81
97#define LOOP_CTL_GET_FREE 0x4C82
98#endif /* _LINUX_LOOP_H */
99

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