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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
struct loop_device {
int lo_number;
struct inode *lo_inode;
int lo_refcnt;
dev_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
};
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
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 4
#define MAX_LO_CRYPT 3
/*
* 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
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