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 */ 20enum { 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 */ 32typedef __kernel_dev_t __kernel_old_dev_t; 33#endif 34 35/* Backwards compatibility version */ 36struct 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 51struct 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