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#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 Public License.

 */

#define LO_NAME_SIZE    64

#define LO_KEY_SIZE     32

#ifdef __KERNEL__

struct loop_device {

        int             lo_number;

        struct inode    *lo_inode;

        int             lo_refcnt;

        kdev_t          lo_device;

        int             lo_offset;

        int             lo_encrypt_type;

        int             lo_encrypt_key_size;

        int             lo_flags;

        int             (*transfer)(struct loop_device *, int cmd,

                                    char *raw_buf, char *loop_buf, int size);

        char            lo_name[LO_NAME_SIZE];

        char            lo_encrypt_key[LO_KEY_SIZE];

#ifdef DES_AVAILABLE

        des_key_schedule lo_des_key;

        unsigned long   lo_des_init[2];

#endif

#ifdef IDEA_AVAILABLE

        idea_key        lo_idea_en_key;

        idea_key        lo_idea_de_key;

#endif

};

typedef int (* transfer_proc_t)(struct loop_device *, int cmd,

                                char *raw_buf, char *loop_buf, int size);

/*

 * Loop flags

 */

#define LO_FLAGS_DO_BMAP        0x00000001

#define LO_FLAGS_READ_ONLY      0x00000002

#endif /* __KERNEL__ */

struct loop_info {

        int             lo_number;      /* ioctl r/o */

        dev_t           lo_device;      /* ioctl r/o */

        unsigned long   lo_inode;       /* ioctl r/o */

        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];

};

/*

 * Loop encryption types --- LO_CRYPT_IDEA isn't supported yet

 */

#define LO_CRYPT_NONE   0

#define LO_CRYPT_XOR    1

#define LO_CRYPT_DES    2

#define LO_CRYPT_IDEA   3

#define MAX_LO_CRYPT    4

/*

 * 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

#endif