]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef _LINUX_LOOP_H |
2 | #define _LINUX_LOOP_H | |
3 | ||
4 | /* | |
5 | * include/linux/loop.h | |
6 | * | |
7 | * Written by Theodore Ts'o, 3/29/93. | |
8 | * | |
9 | * Copyright 1993 by Theodore Ts'o. Redistribution of this file is | |
10 | * permitted under the GNU General Public License. | |
11 | */ | |
12 | ||
13 | #define LO_NAME_SIZE 64 | |
14 | #define LO_KEY_SIZE 32 | |
15 | ||
16 | #ifdef __KERNEL__ | |
17 | #include <linux/bio.h> | |
18 | #include <linux/blkdev.h> | |
19 | #include <linux/spinlock.h> | |
f85221dd | 20 | #include <linux/mutex.h> |
1da177e4 LT |
21 | |
22 | /* Possible states of device */ | |
23 | enum { | |
24 | Lo_unbound, | |
25 | Lo_bound, | |
26 | Lo_rundown, | |
27 | }; | |
28 | ||
29 | struct loop_func_table; | |
30 | ||
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); | |
50 | ||
51 | struct file * lo_backing_file; | |
52 | struct block_device *lo_device; | |
53 | unsigned lo_blocksize; | |
54 | void *key_data; | |
55 | ||
b4e3ca1a | 56 | gfp_t old_gfp_mask; |
1da177e4 LT |
57 | |
58 | spinlock_t lo_lock; | |
59 | struct bio *lo_bio; | |
60 | struct bio *lo_biotail; | |
61 | int lo_state; | |
f85221dd | 62 | struct mutex lo_ctl_mutex; |
6c997918 SH |
63 | struct task_struct *lo_thread; |
64 | wait_queue_head_t lo_event; | |
1da177e4 | 65 | |
01e457cf | 66 | struct request_queue *lo_queue; |
73285082 KC |
67 | struct gendisk *lo_disk; |
68 | struct list_head lo_list; | |
1da177e4 LT |
69 | }; |
70 | ||
71 | #endif /* __KERNEL__ */ | |
72 | ||
73 | /* | |
74 | * Loop flags | |
75 | */ | |
76 | enum { | |
77 | LO_FLAGS_READ_ONLY = 1, | |
78 | LO_FLAGS_USE_AOPS = 2, | |
96c58655 | 79 | LO_FLAGS_AUTOCLEAR = 4, |
1da177e4 LT |
80 | }; |
81 | ||
82 | #include <asm/posix_types.h> /* for __kernel_old_dev_t */ | |
00bfddaf | 83 | #include <linux/types.h> /* for __u64 */ |
1da177e4 LT |
84 | |
85 | /* Backwards compatibility version */ | |
86 | struct loop_info { | |
87 | int lo_number; /* ioctl r/o */ | |
88 | __kernel_old_dev_t lo_device; /* ioctl r/o */ | |
89 | unsigned long lo_inode; /* ioctl r/o */ | |
90 | __kernel_old_dev_t lo_rdevice; /* ioctl r/o */ | |
91 | int lo_offset; | |
92 | int lo_encrypt_type; | |
93 | int lo_encrypt_key_size; /* ioctl w/o */ | |
94 | int lo_flags; /* ioctl r/o */ | |
95 | char lo_name[LO_NAME_SIZE]; | |
96 | unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ | |
97 | unsigned long lo_init[2]; | |
98 | char reserved[4]; | |
99 | }; | |
100 | ||
101 | struct loop_info64 { | |
102 | __u64 lo_device; /* ioctl r/o */ | |
103 | __u64 lo_inode; /* ioctl r/o */ | |
104 | __u64 lo_rdevice; /* ioctl r/o */ | |
105 | __u64 lo_offset; | |
106 | __u64 lo_sizelimit;/* bytes, 0 == max available */ | |
107 | __u32 lo_number; /* ioctl r/o */ | |
108 | __u32 lo_encrypt_type; | |
109 | __u32 lo_encrypt_key_size; /* ioctl w/o */ | |
110 | __u32 lo_flags; /* ioctl r/o */ | |
111 | __u8 lo_file_name[LO_NAME_SIZE]; | |
112 | __u8 lo_crypt_name[LO_NAME_SIZE]; | |
113 | __u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ | |
114 | __u64 lo_init[2]; | |
115 | }; | |
116 | ||
117 | /* | |
118 | * Loop filter types | |
119 | */ | |
120 | ||
121 | #define LO_CRYPT_NONE 0 | |
122 | #define LO_CRYPT_XOR 1 | |
123 | #define LO_CRYPT_DES 2 | |
124 | #define LO_CRYPT_FISH2 3 /* Twofish encryption */ | |
125 | #define LO_CRYPT_BLOW 4 | |
126 | #define LO_CRYPT_CAST128 5 | |
127 | #define LO_CRYPT_IDEA 6 | |
128 | #define LO_CRYPT_DUMMY 9 | |
129 | #define LO_CRYPT_SKIPJACK 10 | |
130 | #define LO_CRYPT_CRYPTOAPI 18 | |
131 | #define MAX_LO_CRYPT 20 | |
132 | ||
133 | #ifdef __KERNEL__ | |
134 | /* Support for loadable transfer modules */ | |
135 | struct loop_func_table { | |
136 | int number; /* filter type */ | |
137 | int (*transfer)(struct loop_device *lo, int cmd, | |
138 | struct page *raw_page, unsigned raw_off, | |
139 | struct page *loop_page, unsigned loop_off, | |
140 | int size, sector_t real_block); | |
141 | int (*init)(struct loop_device *, const struct loop_info64 *); | |
142 | /* release is called from loop_unregister_transfer or clr_fd */ | |
143 | int (*release)(struct loop_device *); | |
144 | int (*ioctl)(struct loop_device *, int cmd, unsigned long arg); | |
145 | struct module *owner; | |
146 | }; | |
147 | ||
148 | int loop_register_transfer(struct loop_func_table *funcs); | |
149 | int loop_unregister_transfer(int number); | |
150 | ||
151 | #endif | |
152 | /* | |
153 | * IOCTL commands --- we will commandeer 0x4C ('L') | |
154 | */ | |
155 | ||
156 | #define LOOP_SET_FD 0x4C00 | |
157 | #define LOOP_CLR_FD 0x4C01 | |
158 | #define LOOP_SET_STATUS 0x4C02 | |
159 | #define LOOP_GET_STATUS 0x4C03 | |
160 | #define LOOP_SET_STATUS64 0x4C04 | |
161 | #define LOOP_GET_STATUS64 0x4C05 | |
162 | #define LOOP_CHANGE_FD 0x4C06 | |
163 | ||
164 | #endif |