#ifndef _LINUX_LOOP_H#define _LINUX_LOOP_H/* * include/linux/loop.h * * Written by Theodore Ts'o, 3/29/93. * * Copyright 1993 by Theodore Ts'o.  Redistribution of this file is * permitted under the GNU General Public License. */#define LO_NAME_SIZE	64#define LO_KEY_SIZE	32/* * Loop flags */enum {	LO_FLAGS_READ_ONLY	= 1,	LO_FLAGS_USE_AOPS	= 2,};#include <asm/posix_types.h>	/* for __kernel_old_dev_t */#include <asm/types.h>		/* for __u64 *//* Backwards compatibility version */struct loop_info {	int		   lo_number;		/* ioctl r/o */	__kernel_old_dev_t lo_device; 		/* ioctl r/o */	unsigned long	   lo_inode; 		/* ioctl r/o */	__kernel_old_dev_t lo_rdevice; 		/* ioctl r/o */	int		   lo_offset;	int		   lo_encrypt_type;	int		   lo_encrypt_key_size; 	/* ioctl w/o */	int		   lo_flags;			/* ioctl r/o */	char		   lo_name[LO_NAME_SIZE];	unsigned char	   lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */	unsigned long	   lo_init[2];	char		   reserved[4];};struct loop_info64 {	__u64		   lo_device;			/* ioctl r/o */	__u64		   lo_inode;			/* ioctl r/o */	__u64		   lo_rdevice;			/* ioctl r/o */	__u64		   lo_offset;	__u64		   lo_sizelimit;/* bytes, 0 == max available */	__u32		   lo_number;			/* ioctl r/o */	__u32		   lo_encrypt_type;	__u32		   lo_encrypt_key_size;		/* ioctl w/o */	__u32		   lo_flags;			/* ioctl r/o */	__u8		   lo_file_name[LO_NAME_SIZE];	__u8		   lo_crypt_name[LO_NAME_SIZE];	__u8		   lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */	__u64		   lo_init[2];};/* * Loop filter types */#define LO_CRYPT_NONE		0#define LO_CRYPT_XOR		1#define LO_CRYPT_DES		2#define LO_CRYPT_FISH2		3    /* Twofish encryption */#define LO_CRYPT_BLOW		4#define LO_CRYPT_CAST128	5#define LO_CRYPT_IDEA		6#define LO_CRYPT_DUMMY		9#define LO_CRYPT_SKIPJACK	10#define LO_CRYPT_CRYPTOAPI	18#define MAX_LO_CRYPT		20/* * IOCTL commands --- we will commandeer 0x4C ('L') */#define LOOP_SET_FD		0x4C00#define LOOP_CLR_FD		0x4C01#define LOOP_SET_STATUS		0x4C02#define LOOP_GET_STATUS		0x4C03#define LOOP_SET_STATUS64	0x4C04#define LOOP_GET_STATUS64	0x4C05#define LOOP_CHANGE_FD		0x4C06#endif