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David Howells607ca462012-10-13 10:46:48 +01001/*
2 * include/linux/loop.h
3 *
4 * Written by Theodore Ts'o, 3/29/93.
5 *
6 * Copyright 1993 by Theodore Ts'o. Redistribution of this file is
7 * permitted under the GNU General Public License.
8 */
9#ifndef _UAPI_LINUX_LOOP_H
10#define _UAPI_LINUX_LOOP_H
11
12
13#define LO_NAME_SIZE 64
14#define LO_KEY_SIZE 32
15
16
17/*
18 * Loop flags
19 */
20enum {
21 LO_FLAGS_READ_ONLY = 1,
22 LO_FLAGS_AUTOCLEAR = 4,
23 LO_FLAGS_PARTSCAN = 8,
Ming Lei2e5ab5f2015-08-17 10:31:49 +080024 LO_FLAGS_DIRECT_IO = 16,
David Howells607ca462012-10-13 10:46:48 +010025};
26
27#include <asm/posix_types.h> /* for __kernel_old_dev_t */
28#include <linux/types.h> /* for __u64 */
29
30/* Backwards compatibility version */
31struct loop_info {
32 int lo_number; /* ioctl r/o */
33 __kernel_old_dev_t lo_device; /* ioctl r/o */
34 unsigned long lo_inode; /* ioctl r/o */
35 __kernel_old_dev_t lo_rdevice; /* ioctl r/o */
36 int lo_offset;
37 int lo_encrypt_type;
38 int lo_encrypt_key_size; /* ioctl w/o */
39 int lo_flags; /* ioctl r/o */
40 char lo_name[LO_NAME_SIZE];
41 unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
42 unsigned long lo_init[2];
43 char reserved[4];
44};
45
46struct loop_info64 {
47 __u64 lo_device; /* ioctl r/o */
48 __u64 lo_inode; /* ioctl r/o */
49 __u64 lo_rdevice; /* ioctl r/o */
50 __u64 lo_offset;
51 __u64 lo_sizelimit;/* bytes, 0 == max available */
52 __u32 lo_number; /* ioctl r/o */
53 __u32 lo_encrypt_type;
54 __u32 lo_encrypt_key_size; /* ioctl w/o */
55 __u32 lo_flags; /* ioctl r/o */
56 __u8 lo_file_name[LO_NAME_SIZE];
57 __u8 lo_crypt_name[LO_NAME_SIZE];
58 __u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
59 __u64 lo_init[2];
60};
61
62/*
63 * Loop filter types
64 */
65
66#define LO_CRYPT_NONE 0
67#define LO_CRYPT_XOR 1
68#define LO_CRYPT_DES 2
69#define LO_CRYPT_FISH2 3 /* Twofish encryption */
70#define LO_CRYPT_BLOW 4
71#define LO_CRYPT_CAST128 5
72#define LO_CRYPT_IDEA 6
73#define LO_CRYPT_DUMMY 9
74#define LO_CRYPT_SKIPJACK 10
75#define LO_CRYPT_CRYPTOAPI 18
76#define MAX_LO_CRYPT 20
77
78/*
79 * IOCTL commands --- we will commandeer 0x4C ('L')
80 */
81
82#define LOOP_SET_FD 0x4C00
83#define LOOP_CLR_FD 0x4C01
84#define LOOP_SET_STATUS 0x4C02
85#define LOOP_GET_STATUS 0x4C03
86#define LOOP_SET_STATUS64 0x4C04
87#define LOOP_GET_STATUS64 0x4C05
88#define LOOP_CHANGE_FD 0x4C06
89#define LOOP_SET_CAPACITY 0x4C07
Ming Leiab1cb272015-08-17 10:31:50 +080090#define LOOP_SET_DIRECT_IO 0x4C08
David Howells607ca462012-10-13 10:46:48 +010091
92/* /dev/loop-control interface */
93#define LOOP_CTL_ADD 0x4C80
94#define LOOP_CTL_REMOVE 0x4C81
95#define LOOP_CTL_GET_FREE 0x4C82
96#endif /* _UAPI_LINUX_LOOP_H */