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