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[linux-2.6.32.60-moxart.git] / include / linux / loop.h
blob66c194e2d9b9c072fc201b864506ae12c010112d
1 #ifndef _LINUX_LOOP_H
2 #define _LINUX_LOOP_H
4 /*
5 * include/linux/loop.h
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
16 #ifdef __KERNEL__
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 */
23 enum {
24 Lo_unbound,
25 Lo_bound,
26 Lo_rundown,
29 struct loop_func_table;
31 struct loop_device {
32 int lo_number;
33 int lo_refcnt;
34 loff_t lo_offset;
35 loff_t lo_sizelimit;
36 int lo_flags;
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;
46 __u32 lo_init[2];
47 uid_t lo_key_owner; /* Who set the key */
48 int (*ioctl)(struct loop_device *, int cmd,
49 unsigned long arg);
51 struct file * lo_backing_file;
52 struct block_device *lo_device;
53 unsigned lo_blocksize;
54 void *key_data;
56 gfp_t old_gfp_mask;
58 spinlock_t lo_lock;
59 struct bio_list lo_bio_list;
60 int lo_state;
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;
67 struct list_head lo_list;
70 #endif /* __KERNEL__ */
73 * Loop flags
75 enum {
76 LO_FLAGS_READ_ONLY = 1,
77 LO_FLAGS_USE_AOPS = 2,
78 LO_FLAGS_AUTOCLEAR = 4,
81 #include <asm/posix_types.h> /* for __kernel_old_dev_t */
82 #include <linux/types.h> /* for __u64 */
84 /* Backwards compatibility version */
85 struct loop_info {
86 int lo_number; /* ioctl r/o */
87 __kernel_old_dev_t lo_device; /* ioctl r/o */
88 unsigned long lo_inode; /* ioctl r/o */
89 __kernel_old_dev_t lo_rdevice; /* ioctl r/o */
90 int lo_offset;
91 int lo_encrypt_type;
92 int lo_encrypt_key_size; /* ioctl w/o */
93 int lo_flags; /* ioctl r/o */
94 char lo_name[LO_NAME_SIZE];
95 unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
96 unsigned long lo_init[2];
97 char reserved[4];
100 struct loop_info64 {
101 __u64 lo_device; /* ioctl r/o */
102 __u64 lo_inode; /* ioctl r/o */
103 __u64 lo_rdevice; /* ioctl r/o */
104 __u64 lo_offset;
105 __u64 lo_sizelimit;/* bytes, 0 == max available */
106 __u32 lo_number; /* ioctl r/o */
107 __u32 lo_encrypt_type;
108 __u32 lo_encrypt_key_size; /* ioctl w/o */
109 __u32 lo_flags; /* ioctl r/o */
110 __u8 lo_file_name[LO_NAME_SIZE];
111 __u8 lo_crypt_name[LO_NAME_SIZE];
112 __u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
113 __u64 lo_init[2];
117 * Loop filter types
120 #define LO_CRYPT_NONE 0
121 #define LO_CRYPT_XOR 1
122 #define LO_CRYPT_DES 2
123 #define LO_CRYPT_FISH2 3 /* Twofish encryption */
124 #define LO_CRYPT_BLOW 4
125 #define LO_CRYPT_CAST128 5
126 #define LO_CRYPT_IDEA 6
127 #define LO_CRYPT_DUMMY 9
128 #define LO_CRYPT_SKIPJACK 10
129 #define LO_CRYPT_CRYPTOAPI 18
130 #define MAX_LO_CRYPT 20
132 #ifdef __KERNEL__
133 /* Support for loadable transfer modules */
134 struct loop_func_table {
135 int number; /* filter type */
136 int (*transfer)(struct loop_device *lo, int cmd,
137 struct page *raw_page, unsigned raw_off,
138 struct page *loop_page, unsigned loop_off,
139 int size, sector_t real_block);
140 int (*init)(struct loop_device *, const struct loop_info64 *);
141 /* release is called from loop_unregister_transfer or clr_fd */
142 int (*release)(struct loop_device *);
143 int (*ioctl)(struct loop_device *, int cmd, unsigned long arg);
144 struct module *owner;
147 int loop_register_transfer(struct loop_func_table *funcs);
148 int loop_unregister_transfer(int number);
150 #endif
152 * IOCTL commands --- we will commandeer 0x4C ('L')
155 #define LOOP_SET_FD 0x4C00
156 #define LOOP_CLR_FD 0x4C01
157 #define LOOP_SET_STATUS 0x4C02
158 #define LOOP_GET_STATUS 0x4C03
159 #define LOOP_SET_STATUS64 0x4C04
160 #define LOOP_GET_STATUS64 0x4C05
161 #define LOOP_CHANGE_FD 0x4C06
162 #define LOOP_SET_CAPACITY 0x4C07
164 #endif