1/*
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 */
95