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;
35 int (*transfer)(struct loop_device *, int cmd,
36 char *raw_buf, char *loop_buf, int size,
38 char lo_name[LO_NAME_SIZE];
39 char lo_encrypt_key[LO_KEY_SIZE];
40 int lo_encrypt_key_size;
41 struct loop_func_table *lo_encryption;
43 uid_t lo_key_owner; /* Who set the key */
44 int (*ioctl)(struct loop_device *, int cmd,
47 struct file * lo_backing_file;
48 struct block_device *lo_device;
49 unsigned lo_blocksize;
51 char key_reserved[48]; /* for use by the filter modules */
57 struct bio *lo_biotail;
59 struct semaphore lo_sem;
60 struct semaphore lo_ctl_mutex;
61 struct semaphore lo_bh_mutex;
64 request_queue_t lo_queue;
67 typedef int (* transfer_proc_t)(struct loop_device *, int cmd,
68 char *raw_buf, char *loop_buf, int size,
71 #endif /* __KERNEL__ */
76 #define LO_FLAGS_DO_BMAP 1
77 #define LO_FLAGS_READ_ONLY 2
79 #include <asm/posix_types.h> /* for __kernel_old_dev_t */
80 #include <asm/types.h> /* for __u64 */
82 /* Backwards compatibility version */
84 int lo_number; /* ioctl r/o */
85 __kernel_old_dev_t lo_device; /* ioctl r/o */
86 unsigned long lo_inode; /* ioctl r/o */
87 __kernel_old_dev_t lo_rdevice; /* ioctl r/o */
90 int lo_encrypt_key_size; /* ioctl w/o */
91 int lo_flags; /* ioctl r/o */
92 char lo_name[LO_NAME_SIZE];
93 unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
94 unsigned long lo_init[2];
99 __u64 lo_device; /* ioctl r/o */
100 __u64 lo_inode; /* ioctl r/o */
101 __u64 lo_rdevice; /* ioctl r/o */
103 __u32 lo_number; /* ioctl r/o */
104 __u32 lo_encrypt_type;
105 __u32 lo_encrypt_key_size; /* ioctl w/o */
106 __u32 lo_flags; /* ioctl r/o */
107 __u8 lo_name[LO_NAME_SIZE];
108 __u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
116 #define LO_CRYPT_NONE 0
117 #define LO_CRYPT_XOR 1
118 #define LO_CRYPT_DES 2
119 #define LO_CRYPT_FISH2 3 /* Brand new Twofish encryption */
120 #define LO_CRYPT_BLOW 4
121 #define LO_CRYPT_CAST128 5
122 #define LO_CRYPT_IDEA 6
123 #define LO_CRYPT_DUMMY 9
124 #define LO_CRYPT_SKIPJACK 10
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