#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,
        LO_FLAGS_AUTOCLEAR        = 4,
};

#include <asm/posix_types.h>        /* for __kernel_old_dev_t */
#include <linux/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
#define LOOP_SET_CAPACITY        0x4C07

#endif