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 _UAPI_LINUX_LOOP_H
11 #define _UAPI_LINUX_LOOP_H
12
13
14 #define LO_NAME_SIZE 64
15 #define LO_KEY_SIZE 32
16
17
18 /*
19 * Loop flags
20 */
21 enum {
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 */
32 struct 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
47 struct 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 /* _UAPI_LINUX_LOOP_H */