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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,
24};
25
26#include <asm/posix_types.h> /* for __kernel_old_dev_t */
27#include <linux/types.h> /* for __u64 */
28
29/* Backwards compatibility version */
30struct loop_info {
31 int lo_number; /* ioctl r/o */
32 __kernel_old_dev_t lo_device; /* ioctl r/o */
33 unsigned long lo_inode; /* ioctl r/o */
34 __kernel_old_dev_t lo_rdevice; /* ioctl r/o */
35 int lo_offset;
36 int lo_encrypt_type;
37 int lo_encrypt_key_size; /* ioctl w/o */
38 int lo_flags; /* ioctl r/o */
39 char lo_name[LO_NAME_SIZE];
40 unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
41 unsigned long lo_init[2];
42 char reserved[4];
43};
44
45struct loop_info64 {
46 __u64 lo_device; /* ioctl r/o */
47 __u64 lo_inode; /* ioctl r/o */
48 __u64 lo_rdevice; /* ioctl r/o */
49 __u64 lo_offset;
50 __u64 lo_sizelimit;/* bytes, 0 == max available */
51 __u32 lo_number; /* ioctl r/o */
52 __u32 lo_encrypt_type;
53 __u32 lo_encrypt_key_size; /* ioctl w/o */
54 __u32 lo_flags; /* ioctl r/o */
55 __u8 lo_file_name[LO_NAME_SIZE];
56 __u8 lo_crypt_name[LO_NAME_SIZE];
57 __u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
58 __u64 lo_init[2];
59};
60
61/*
62 * Loop filter types
63 */
64
65#define LO_CRYPT_NONE 0
66#define LO_CRYPT_XOR 1
67#define LO_CRYPT_DES 2
68#define LO_CRYPT_FISH2 3 /* Twofish encryption */
69#define LO_CRYPT_BLOW 4
70#define LO_CRYPT_CAST128 5
71#define LO_CRYPT_IDEA 6
72#define LO_CRYPT_DUMMY 9
73#define LO_CRYPT_SKIPJACK 10
74#define LO_CRYPT_CRYPTOAPI 18
75#define MAX_LO_CRYPT 20
76
77/*
78 * IOCTL commands --- we will commandeer 0x4C ('L')
79 */
80
81#define LOOP_SET_FD 0x4C00
82#define LOOP_CLR_FD 0x4C01
83#define LOOP_SET_STATUS 0x4C02
84#define LOOP_GET_STATUS 0x4C03
85#define LOOP_SET_STATUS64 0x4C04
86#define LOOP_GET_STATUS64 0x4C05
87#define LOOP_CHANGE_FD 0x4C06
88#define LOOP_SET_CAPACITY 0x4C07
89
90/* /dev/loop-control interface */
91#define LOOP_CTL_ADD 0x4C80
92#define LOOP_CTL_REMOVE 0x4C81
93#define LOOP_CTL_GET_FREE 0x4C82
94#endif /* _UAPI_LINUX_LOOP_H */