| 1 | #ifndef _LINUX_LOOP_H |
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| 2 | #define _LINUX_LOOP_H |
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| 3 | |
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| 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 | |
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| 13 | #define LO_NAME_SIZE 64 |
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| 14 | #define LO_KEY_SIZE 32 |
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| 15 | |
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| 16 | |
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| 17 | /* |
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| 18 | * Loop flags |
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| 19 | */ |
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| 20 | enum { |
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| 21 | LO_FLAGS_READ_ONLY = 1, |
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| 22 | LO_FLAGS_USE_AOPS = 2, |
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| 23 | LO_FLAGS_AUTOCLEAR = 4, |
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| 24 | }; |
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| 25 | |
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| 26 | #include <asm/posix_types.h> /* for __kernel_old_dev_t */ |
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| 27 | #include <linux/types.h> /* for __u64 */ |
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| 28 | #include <linux/version.h> /* version of Linux kernel headers */ |
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| 29 | |
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| 30 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) |
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| 31 | /* We have truly ancient Linux kernel headers installed */ |
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| 32 | typedef __kernel_dev_t __kernel_old_dev_t; |
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| 33 | #endif |
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| 34 | |
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| 35 | /* Backwards compatibility version */ |
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| 36 | struct loop_info { |
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| 37 | int lo_number; /* ioctl r/o */ |
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| 38 | __kernel_old_dev_t lo_device; /* ioctl r/o */ |
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| 39 | unsigned long lo_inode; /* ioctl r/o */ |
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| 40 | __kernel_old_dev_t lo_rdevice; /* ioctl r/o */ |
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| 41 | int lo_offset; |
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| 42 | int lo_encrypt_type; |
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| 43 | int lo_encrypt_key_size; /* ioctl w/o */ |
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| 44 | int lo_flags; /* ioctl r/o */ |
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| 45 | char lo_name[LO_NAME_SIZE]; |
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| 46 | unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ |
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| 47 | unsigned long lo_init[2]; |
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| 48 | char reserved[4]; |
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| 49 | }; |
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| 50 | |
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| 51 | struct loop_info64 { |
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| 52 | __u64 lo_device; /* ioctl r/o */ |
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| 53 | __u64 lo_inode; /* ioctl r/o */ |
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| 54 | __u64 lo_rdevice; /* ioctl r/o */ |
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| 55 | __u64 lo_offset; |
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| 56 | __u64 lo_sizelimit;/* bytes, 0 == max available */ |
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| 57 | __u32 lo_number; /* ioctl r/o */ |
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| 58 | __u32 lo_encrypt_type; |
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| 59 | __u32 lo_encrypt_key_size; /* ioctl w/o */ |
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| 60 | __u32 lo_flags; /* ioctl r/o */ |
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| 61 | __u8 lo_file_name[LO_NAME_SIZE]; |
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| 62 | __u8 lo_crypt_name[LO_NAME_SIZE]; |
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| 63 | __u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ |
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| 64 | __u64 lo_init[2]; |
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| 65 | }; |
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| 66 | |
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| 67 | /* |
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| 68 | * Loop filter types |
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| 69 | */ |
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| 70 | |
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| 71 | #define LO_CRYPT_NONE 0 |
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| 72 | #define LO_CRYPT_XOR 1 |
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| 73 | #define LO_CRYPT_DES 2 |
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| 74 | #define LO_CRYPT_FISH2 3 /* Twofish encryption */ |
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| 75 | #define LO_CRYPT_BLOW 4 |
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| 76 | #define LO_CRYPT_CAST128 5 |
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| 77 | #define LO_CRYPT_IDEA 6 |
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| 78 | #define LO_CRYPT_DUMMY 9 |
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| 79 | #define LO_CRYPT_SKIPJACK 10 |
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| 80 | #define LO_CRYPT_CRYPTOAPI 18 |
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| 81 | #define MAX_LO_CRYPT 20 |
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| 82 | |
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| 83 | /* |
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| 84 | * IOCTL commands --- we will commandeer 0x4C ('L') |
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| 85 | */ |
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| 86 | |
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| 87 | #define LOOP_SET_FD 0x4C00 |
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| 88 | #define LOOP_CLR_FD 0x4C01 |
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| 89 | #define LOOP_SET_STATUS 0x4C02 |
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| 90 | #define LOOP_GET_STATUS 0x4C03 |
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| 91 | #define LOOP_SET_STATUS64 0x4C04 |
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| 92 | #define LOOP_GET_STATUS64 0x4C05 |
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| 93 | #define LOOP_CHANGE_FD 0x4C06 |
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| 94 | #define LOOP_SET_CAPACITY 0x4C07 |
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| 95 | |
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| 96 | #endif |
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