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/blkdev.h>
19 #include <linux/spinlock.h>
20 #include <linux/mutex.h>
22 /* Possible states of device */
29 struct loop_func_table;
37 int (*transfer)(struct loop_device *, int cmd,
38 struct page *raw_page, unsigned raw_off,
39 struct page *loop_page, unsigned loop_off,
40 int size, sector_t real_block);
41 char lo_file_name[LO_NAME_SIZE];
42 char lo_crypt_name[LO_NAME_SIZE];
43 char lo_encrypt_key[LO_KEY_SIZE];
44 int lo_encrypt_key_size;
45 struct loop_func_table *lo_encryption;
47 uid_t lo_key_owner; /* Who set the key */
48 int (*ioctl)(struct loop_device *, int cmd,
51 struct file * lo_backing_file;
52 struct block_device *lo_device;
53 unsigned lo_blocksize;
59 struct bio_list lo_bio_list;
61 struct mutex lo_ctl_mutex;
62 struct task_struct *lo_thread;
63 wait_queue_head_t lo_event;
65 struct request_queue *lo_queue;
66 struct gendisk *lo_disk;
69 #endif /* __KERNEL__ */
75 LO_FLAGS_READ_ONLY = 1,
76 LO_FLAGS_USE_AOPS = 2,
77 LO_FLAGS_AUTOCLEAR = 4,
80 #include <asm/posix_types.h> /* for __kernel_old_dev_t */
81 #include <linux/types.h> /* for __u64 */
83 /* Backwards compatibility version */
85 int lo_number; /* ioctl r/o */
86 __kernel_old_dev_t lo_device; /* ioctl r/o */
87 unsigned long lo_inode; /* ioctl r/o */
88 __kernel_old_dev_t lo_rdevice; /* ioctl r/o */
91 int lo_encrypt_key_size; /* ioctl w/o */
92 int lo_flags; /* ioctl r/o */
93 char lo_name[LO_NAME_SIZE];
94 unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
95 unsigned long lo_init[2];
100 __u64 lo_device; /* ioctl r/o */
101 __u64 lo_inode; /* ioctl r/o */
102 __u64 lo_rdevice; /* ioctl r/o */
104 __u64 lo_sizelimit;/* bytes, 0 == max available */
105 __u32 lo_number; /* ioctl r/o */
106 __u32 lo_encrypt_type;
107 __u32 lo_encrypt_key_size; /* ioctl w/o */
108 __u32 lo_flags; /* ioctl r/o */
109 __u8 lo_file_name[LO_NAME_SIZE];
110 __u8 lo_crypt_name[LO_NAME_SIZE];
111 __u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
119 #define LO_CRYPT_NONE 0
120 #define LO_CRYPT_XOR 1
121 #define LO_CRYPT_DES 2
122 #define LO_CRYPT_FISH2 3 /* Twofish encryption */
123 #define LO_CRYPT_BLOW 4
124 #define LO_CRYPT_CAST128 5
125 #define LO_CRYPT_IDEA 6
126 #define LO_CRYPT_DUMMY 9
127 #define LO_CRYPT_SKIPJACK 10
128 #define LO_CRYPT_CRYPTOAPI 18
129 #define MAX_LO_CRYPT 20
132 /* Support for loadable transfer modules */
133 struct loop_func_table {
134 int number; /* filter type */
135 int (*transfer)(struct loop_device *lo, int cmd,
136 struct page *raw_page, unsigned raw_off,
137 struct page *loop_page, unsigned loop_off,
138 int size, sector_t real_block);
139 int (*init)(struct loop_device *, const struct loop_info64 *);
140 /* release is called from loop_unregister_transfer or clr_fd */
141 int (*release)(struct loop_device *);
142 int (*ioctl)(struct loop_device *, int cmd, unsigned long arg);
143 struct module *owner;
146 int loop_register_transfer(struct loop_func_table *funcs);
147 int loop_unregister_transfer(int number);
151 * IOCTL commands --- we will commandeer 0x4C ('L')
154 #define LOOP_SET_FD 0x4C00
155 #define LOOP_CLR_FD 0x4C01
156 #define LOOP_SET_STATUS 0x4C02
157 #define LOOP_GET_STATUS 0x4C03
158 #define LOOP_SET_STATUS64 0x4C04
159 #define LOOP_GET_STATUS64 0x4C05
160 #define LOOP_CHANGE_FD 0x4C06
161 #define LOOP_SET_CAPACITY 0x4C07
163 /* /dev/loop-control interface */
164 #define LOOP_CTL_ADD 0x4C80
165 #define LOOP_CTL_REMOVE 0x4C81
166 #define LOOP_CTL_GET_FREE 0x4C82