7 * Written by Theodore Ts'o, 3/29/93.
9 * Copyright 1993 by Theodore Ts'o. Redistribution of this file is
10 * permitted under the GNU General Public License.
13 #define LO_NAME_SIZE 64
14 #define LO_KEY_SIZE 32
17 #include <linux/bio.h>
18 #include <linux/blk.h>
19 #include <linux/spinlock.h>
21 /* Possible states of device */
28 struct loop_func_table
;
36 int (*transfer
)(struct loop_device
*, int cmd
,
37 char *raw_buf
, char *loop_buf
, int size
,
39 char lo_file_name
[LO_NAME_SIZE
];
40 char lo_crypt_name
[LO_NAME_SIZE
];
41 char lo_encrypt_key
[LO_KEY_SIZE
];
42 int lo_encrypt_key_size
;
43 struct loop_func_table
*lo_encryption
;
45 uid_t lo_key_owner
; /* Who set the key */
46 int (*ioctl
)(struct loop_device
*, int cmd
,
49 struct file
* lo_backing_file
;
50 struct block_device
*lo_device
;
51 unsigned lo_blocksize
;
58 struct bio
*lo_biotail
;
60 struct semaphore lo_sem
;
61 struct semaphore lo_ctl_mutex
;
62 struct semaphore lo_bh_mutex
;
65 request_queue_t lo_queue
;
68 #endif /* __KERNEL__ */
73 #define LO_FLAGS_DO_BMAP 1
74 #define LO_FLAGS_READ_ONLY 2
76 #include <asm/posix_types.h> /* for __kernel_old_dev_t */
77 #include <asm/types.h> /* for __u64 */
79 /* Backwards compatibility version */
81 int lo_number
; /* ioctl r/o */
82 __kernel_old_dev_t lo_device
; /* ioctl r/o */
83 unsigned long lo_inode
; /* ioctl r/o */
84 __kernel_old_dev_t lo_rdevice
; /* ioctl r/o */
87 int lo_encrypt_key_size
; /* ioctl w/o */
88 int lo_flags
; /* ioctl r/o */
89 char lo_name
[LO_NAME_SIZE
];
90 unsigned char lo_encrypt_key
[LO_KEY_SIZE
]; /* ioctl w/o */
91 unsigned long lo_init
[2];
96 __u64 lo_device
; /* ioctl r/o */
97 __u64 lo_inode
; /* ioctl r/o */
98 __u64 lo_rdevice
; /* ioctl r/o */
100 __u64 lo_sizelimit
;/* bytes, 0 == max available */
101 __u32 lo_number
; /* ioctl r/o */
102 __u32 lo_encrypt_type
;
103 __u32 lo_encrypt_key_size
; /* ioctl w/o */
104 __u32 lo_flags
; /* ioctl r/o */
105 __u8 lo_file_name
[LO_NAME_SIZE
];
106 __u8 lo_crypt_name
[LO_NAME_SIZE
];
107 __u8 lo_encrypt_key
[LO_KEY_SIZE
]; /* ioctl w/o */
115 #define LO_CRYPT_NONE 0
116 #define LO_CRYPT_XOR 1
117 #define LO_CRYPT_DES 2
118 #define LO_CRYPT_FISH2 3 /* Twofish encryption */
119 #define LO_CRYPT_BLOW 4
120 #define LO_CRYPT_CAST128 5
121 #define LO_CRYPT_IDEA 6
122 #define LO_CRYPT_DUMMY 9
123 #define LO_CRYPT_SKIPJACK 10
124 #define LO_CRYPT_CRYPTOAPI 18
125 #define MAX_LO_CRYPT 20
128 /* Support for loadable transfer modules */
129 struct loop_func_table
{
130 int number
; /* filter type */
131 int (*transfer
)(struct loop_device
*lo
, int cmd
, char *raw_buf
,
132 char *loop_buf
, int size
, sector_t real_block
);
133 int (*init
)(struct loop_device
*, const struct loop_info64
*);
134 /* release is called from loop_unregister_transfer or clr_fd */
135 int (*release
)(struct loop_device
*);
136 int (*ioctl
)(struct loop_device
*, int cmd
, unsigned long arg
);
137 struct module
*owner
;
140 int loop_register_transfer(struct loop_func_table
*funcs
);
141 int loop_unregister_transfer(int number
);
145 * IOCTL commands --- we will commandeer 0x4C ('L')
148 #define LOOP_SET_FD 0x4C00
149 #define LOOP_CLR_FD 0x4C01
150 #define LOOP_SET_STATUS 0x4C02
151 #define LOOP_GET_STATUS 0x4C03
152 #define LOOP_SET_STATUS64 0x4C04
153 #define LOOP_GET_STATUS64 0x4C05