xref: /openbmc/qemu/linux-user/linux_loop.h (revision 05caa062)
1 /* Copied from 2.6.25 kernel headers to avoid problems on older hosts,
2  * and subsequently updated to match newer additions to the API.
3  */
4 
5 #ifndef LINUX_LOOP_H
6 #define LINUX_LOOP_H
7 
8 /*
9  * include/linux/loop.h
10  *
11  * Written by Theodore Ts'o, 3/29/93.
12  *
13  * Copyright 1993 by Theodore Ts'o.  Redistribution of this file is
14  * permitted under the GNU General Public License.
15  */
16 
17 #define LO_NAME_SIZE	64
18 #define LO_KEY_SIZE	32
19 
20 
21 /*
22  * Loop flags
23  */
24 enum {
25 	LO_FLAGS_READ_ONLY	= 1,
26 	LO_FLAGS_USE_AOPS	= 2,
27 	LO_FLAGS_AUTOCLEAR	= 4,
28 };
29 
30 #include <linux/version.h>
31 #include <asm/posix_types.h>	/* for __kernel_old_dev_t */
32 #include <asm/types.h>		/* for __u64 */
33 
34 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) /* This is a guess.  */
35 #define __kernel_old_dev_t __kernel_dev_t
36 #endif
37 
38 /* Backwards compatibility version */
39 struct loop_info {
40 	int		   lo_number;		/* ioctl r/o */
41 	__kernel_old_dev_t lo_device; 		/* ioctl r/o */
42 	unsigned long	   lo_inode; 		/* ioctl r/o */
43 	__kernel_old_dev_t lo_rdevice; 		/* ioctl r/o */
44 	int		   lo_offset;
45 	int		   lo_encrypt_type;
46 	int		   lo_encrypt_key_size; 	/* ioctl w/o */
47 	int		   lo_flags;			/* ioctl r/o */
48 	char		   lo_name[LO_NAME_SIZE];
49 	unsigned char	   lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
50 	unsigned long	   lo_init[2];
51 	char		   reserved[4];
52 };
53 
54 struct loop_info64 {
55 	__u64		   lo_device;			/* ioctl r/o */
56 	__u64		   lo_inode;			/* ioctl r/o */
57 	__u64		   lo_rdevice;			/* ioctl r/o */
58 	__u64		   lo_offset;
59 	__u64		   lo_sizelimit;/* bytes, 0 == max available */
60 	__u32		   lo_number;			/* ioctl r/o */
61 	__u32		   lo_encrypt_type;
62 	__u32		   lo_encrypt_key_size;		/* ioctl w/o */
63 	__u32		   lo_flags;			/* ioctl r/o */
64 	__u8		   lo_file_name[LO_NAME_SIZE];
65 	__u8		   lo_crypt_name[LO_NAME_SIZE];
66 	__u8		   lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
67 	__u64		   lo_init[2];
68 };
69 
70 /*
71  * Loop filter types
72  */
73 
74 #define LO_CRYPT_NONE		0
75 #define LO_CRYPT_XOR		1
76 #define LO_CRYPT_DES		2
77 #define LO_CRYPT_FISH2		3    /* Twofish encryption */
78 #define LO_CRYPT_BLOW		4
79 #define LO_CRYPT_CAST128	5
80 #define LO_CRYPT_IDEA		6
81 #define LO_CRYPT_DUMMY		9
82 #define LO_CRYPT_SKIPJACK	10
83 #define LO_CRYPT_CRYPTOAPI	18
84 #define MAX_LO_CRYPT		20
85 
86 /*
87  * IOCTL commands --- we will commandeer 0x4C ('L')
88  */
89 
90 #define LOOP_SET_FD		0x4C00
91 #define LOOP_CLR_FD		0x4C01
92 #define LOOP_SET_STATUS		0x4C02
93 #define LOOP_GET_STATUS		0x4C03
94 #define LOOP_SET_STATUS64	0x4C04
95 #define LOOP_GET_STATUS64	0x4C05
96 #define LOOP_CHANGE_FD		0x4C06
97 #define LOOP_SET_CAPACITY       0x4C07
98 #define LOOP_SET_DIRECT_IO      0x4C08
99 #define LOOP_SET_BLOCK_SIZE     0x4C09
100 #define LOOP_CONFIGURE          0x4C0A
101 
102 /* /dev/loop-control interface */
103 #define LOOP_CTL_ADD            0x4C80
104 #define LOOP_CTL_REMOVE         0x4C81
105 #define LOOP_CTL_GET_FREE       0x4C82
106 
107 #endif
108