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 17 /* 18 * Loop flags 19 */ 20 enum { 21 LO_FLAGS_READ_ONLY = 1, 22 LO_FLAGS_USE_AOPS = 2, 23 LO_FLAGS_AUTOCLEAR = 4, 24 }; 25 26 #include <asm/posix_types.h> /* for __kernel_old_dev_t */ 27 #include <linux/types.h> /* for __u64 */ 28 #include <linux/version.h> /* version of Linux kernel headers */ 29 30 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) 31 /* We have truly ancient Linux kernel headers installed */ 32 typedef __kernel_dev_t __kernel_old_dev_t; 33 #endif 34 35 /* Backwards compatibility version */ 36 struct loop_info { 37 int lo_number; /* ioctl r/o */ 38 __kernel_old_dev_t lo_device; /* ioctl r/o */ 39 unsigned long lo_inode; /* ioctl r/o */ 40 __kernel_old_dev_t lo_rdevice; /* ioctl r/o */ 41 int lo_offset; 42 int lo_encrypt_type; 43 int lo_encrypt_key_size; /* ioctl w/o */ 44 int lo_flags; /* ioctl r/o */ 45 char lo_name[LO_NAME_SIZE]; 46 unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ 47 unsigned long lo_init[2]; 48 char reserved[4]; 49 }; 50 51 struct loop_info64 { 52 __u64 lo_device; /* ioctl r/o */ 53 __u64 lo_inode; /* ioctl r/o */ 54 __u64 lo_rdevice; /* ioctl r/o */ 55 __u64 lo_offset; 56 __u64 lo_sizelimit;/* bytes, 0 == max available */ 57 __u32 lo_number; /* ioctl r/o */ 58 __u32 lo_encrypt_type; 59 __u32 lo_encrypt_key_size; /* ioctl w/o */ 60 __u32 lo_flags; /* ioctl r/o */ 61 __u8 lo_file_name[LO_NAME_SIZE]; 62 __u8 lo_crypt_name[LO_NAME_SIZE]; 63 __u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ 64 __u64 lo_init[2]; 65 }; 66 67 /* 68 * Loop filter types 69 */ 70 71 #define LO_CRYPT_NONE 0 72 #define LO_CRYPT_XOR 1 73 #define LO_CRYPT_DES 2 74 #define LO_CRYPT_FISH2 3 /* Twofish encryption */ 75 #define LO_CRYPT_BLOW 4 76 #define LO_CRYPT_CAST128 5 77 #define LO_CRYPT_IDEA 6 78 #define LO_CRYPT_DUMMY 9 79 #define LO_CRYPT_SKIPJACK 10 80 #define LO_CRYPT_CRYPTOAPI 18 81 #define MAX_LO_CRYPT 20 82 83 /* 84 * IOCTL commands --- we will commandeer 0x4C ('L') 85 */ 86 87 #define LOOP_SET_FD 0x4C00 88 #define LOOP_CLR_FD 0x4C01 89 #define LOOP_SET_STATUS 0x4C02 90 #define LOOP_GET_STATUS 0x4C03 91 #define LOOP_SET_STATUS64 0x4C04 92 #define LOOP_GET_STATUS64 0x4C05 93 #define LOOP_CHANGE_FD 0x4C06 94 #define LOOP_SET_CAPACITY 0x4C07 95 96 #endif 97
