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Rev | Author | Line No. | Line |
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422 | giacomo | 1 | #ifndef _LINUX_LOOP_H |
2 | #define _LINUX_LOOP_H |
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3 | |||
4 | /* |
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5 | * include/linux/loop.h |
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6 | * |
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7 | * Written by Theodore Ts'o, 3/29/93. |
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8 | * |
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9 | * Copyright 1993 by Theodore Ts'o. Redistribution of this file is |
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10 | * permitted under the GNU General Public License. |
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11 | */ |
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12 | |||
13 | #define LO_NAME_SIZE 64 |
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14 | #define LO_KEY_SIZE 32 |
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15 | |||
16 | #ifdef __KERNEL__ |
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17 | #include <linux/bio.h> |
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18 | #include <linux/blkdev.h> |
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19 | #include <linux/spinlock.h> |
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20 | |||
21 | /* Possible states of device */ |
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22 | enum { |
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23 | Lo_unbound, |
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24 | Lo_bound, |
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25 | Lo_rundown, |
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26 | }; |
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27 | |||
28 | struct loop_func_table; |
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29 | |||
30 | struct loop_device { |
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31 | int lo_number; |
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32 | int lo_refcnt; |
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33 | loff_t lo_offset; |
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34 | loff_t lo_sizelimit; |
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35 | int lo_flags; |
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36 | int (*transfer)(struct loop_device *, int cmd, |
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37 | char *raw_buf, char *loop_buf, int size, |
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38 | sector_t real_block); |
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39 | char lo_file_name[LO_NAME_SIZE]; |
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40 | char lo_crypt_name[LO_NAME_SIZE]; |
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41 | char lo_encrypt_key[LO_KEY_SIZE]; |
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42 | int lo_encrypt_key_size; |
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43 | struct loop_func_table *lo_encryption; |
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44 | __u32 lo_init[2]; |
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45 | uid_t lo_key_owner; /* Who set the key */ |
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46 | int (*ioctl)(struct loop_device *, int cmd, |
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47 | unsigned long arg); |
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48 | |||
49 | struct file * lo_backing_file; |
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50 | struct block_device *lo_device; |
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51 | unsigned lo_blocksize; |
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52 | void *key_data; |
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53 | |||
54 | int old_gfp_mask; |
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55 | |||
56 | spinlock_t lo_lock; |
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57 | struct bio *lo_bio; |
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58 | struct bio *lo_biotail; |
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59 | int lo_state; |
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60 | struct semaphore lo_sem; |
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61 | struct semaphore lo_ctl_mutex; |
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62 | struct semaphore lo_bh_mutex; |
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63 | atomic_t lo_pending; |
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64 | |||
65 | request_queue_t *lo_queue; |
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66 | }; |
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67 | |||
68 | #endif /* __KERNEL__ */ |
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69 | |||
70 | /* |
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71 | * Loop flags |
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72 | */ |
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73 | #define LO_FLAGS_DO_BMAP 1 |
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74 | #define LO_FLAGS_READ_ONLY 2 |
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75 | |||
76 | #include <asm/posix_types.h> /* for __kernel_old_dev_t */ |
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77 | #include <asm/types.h> /* for __u64 */ |
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78 | |||
79 | /* Backwards compatibility version */ |
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80 | struct loop_info { |
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81 | int lo_number; /* ioctl r/o */ |
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82 | __kernel_old_dev_t lo_device; /* ioctl r/o */ |
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83 | unsigned long lo_inode; /* ioctl r/o */ |
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84 | __kernel_old_dev_t lo_rdevice; /* ioctl r/o */ |
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85 | int lo_offset; |
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86 | int lo_encrypt_type; |
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87 | int lo_encrypt_key_size; /* ioctl w/o */ |
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88 | int lo_flags; /* ioctl r/o */ |
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89 | char lo_name[LO_NAME_SIZE]; |
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90 | unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ |
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91 | unsigned long lo_init[2]; |
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92 | char reserved[4]; |
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93 | }; |
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94 | |||
95 | struct loop_info64 { |
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96 | __u64 lo_device; /* ioctl r/o */ |
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97 | __u64 lo_inode; /* ioctl r/o */ |
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98 | __u64 lo_rdevice; /* ioctl r/o */ |
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99 | __u64 lo_offset; |
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100 | __u64 lo_sizelimit;/* bytes, 0 == max available */ |
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101 | __u32 lo_number; /* ioctl r/o */ |
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102 | __u32 lo_encrypt_type; |
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103 | __u32 lo_encrypt_key_size; /* ioctl w/o */ |
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104 | __u32 lo_flags; /* ioctl r/o */ |
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105 | __u8 lo_file_name[LO_NAME_SIZE]; |
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106 | __u8 lo_crypt_name[LO_NAME_SIZE]; |
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107 | __u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ |
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108 | __u64 lo_init[2]; |
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109 | }; |
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110 | |||
111 | /* |
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112 | * Loop filter types |
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113 | */ |
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114 | |||
115 | #define LO_CRYPT_NONE 0 |
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116 | #define LO_CRYPT_XOR 1 |
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117 | #define LO_CRYPT_DES 2 |
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118 | #define LO_CRYPT_FISH2 3 /* Twofish encryption */ |
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119 | #define LO_CRYPT_BLOW 4 |
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120 | #define LO_CRYPT_CAST128 5 |
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121 | #define LO_CRYPT_IDEA 6 |
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122 | #define LO_CRYPT_DUMMY 9 |
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123 | #define LO_CRYPT_SKIPJACK 10 |
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124 | #define LO_CRYPT_CRYPTOAPI 18 |
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125 | #define MAX_LO_CRYPT 20 |
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126 | |||
127 | #ifdef __KERNEL__ |
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128 | /* Support for loadable transfer modules */ |
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129 | struct loop_func_table { |
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130 | int number; /* filter type */ |
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131 | int (*transfer)(struct loop_device *lo, int cmd, char *raw_buf, |
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132 | char *loop_buf, int size, sector_t real_block); |
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133 | int (*init)(struct loop_device *, const struct loop_info64 *); |
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134 | /* release is called from loop_unregister_transfer or clr_fd */ |
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135 | int (*release)(struct loop_device *); |
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136 | int (*ioctl)(struct loop_device *, int cmd, unsigned long arg); |
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137 | struct module *owner; |
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138 | }; |
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139 | |||
140 | int loop_register_transfer(struct loop_func_table *funcs); |
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141 | int loop_unregister_transfer(int number); |
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142 | |||
143 | #endif |
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144 | /* |
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145 | * IOCTL commands --- we will commandeer 0x4C ('L') |
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146 | */ |
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147 | |||
148 | #define LOOP_SET_FD 0x4C00 |
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149 | #define LOOP_CLR_FD 0x4C01 |
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150 | #define LOOP_SET_STATUS 0x4C02 |
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151 | #define LOOP_GET_STATUS 0x4C03 |
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152 | #define LOOP_SET_STATUS64 0x4C04 |
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153 | #define LOOP_GET_STATUS64 0x4C05 |
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154 | |||
155 | #endif |