Quelle loop.h Sprache: C

/* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */
/*
* Copyright 1993 by Theodore Ts'o.
*/
#ifndef _UAPI_LINUX_LOOP_H
#define _UAPI_LINUX_LOOP_H

#define LO_NAME_SIZE 64
#define LO_KEY_SIZE 32

/*
* Loop flags
*/
enum {
LO_FLAGS_READ_ONLY = 1,
LO_FLAGS_AUTOCLEAR = 4,
LO_FLAGS_PARTSCAN = 8,
LO_FLAGS_DIRECT_IO = 16,
};

/* LO_FLAGS that can be set using LOOP_SET_STATUS(64) */
#define LOOP_SET_STATUS_SETTABLE_FLAGS (LO_FLAGS_AUTOCLEAR | LO_FLAGS_PARTSCAN)

/* LO_FLAGS that can be cleared using LOOP_SET_STATUS(64) */
#define LOOP_SET_STATUS_CLEARABLE_FLAGS (LO_FLAGS_AUTOCLEAR)

/* LO_FLAGS that can be set using LOOP_CONFIGURE */
#define LOOP_CONFIGURE_SETTABLE_FLAGS (LO_FLAGS_READ_ONLY | LO_FLAGS_AUTOCLEAR \
           | LO_FLAGS_PARTSCAN | LO_FLAGS_DIRECT_IO)

#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;  /* obsolete, ignored */
int     lo_encrypt_key_size;  /* ioctl w/o */
int     lo_flags;
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;  /* obsolete, ignored */
__u32     lo_encrypt_key_size;  /* ioctl w/o */
__u32     lo_flags;
__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];
};

/**
* struct loop_config - Complete configuration for a loop device.
* @fd: fd of the file to be used as a backing file for the loop device.
* @block_size: block size to use; ignored if 0.
* @info: struct loop_info64 to configure the loop device with.
*
* This structure is used with the LOOP_CONFIGURE ioctl, and can be used to
* atomically setup and configure all loop device parameters at once.
*/
struct loop_config {
__u32   fd;
__u32                   block_size;
struct loop_info64 info;
__u64   __reserved[8];
};

/*
* 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
#define LOOP_SET_DIRECT_IO 0x4C08
#define LOOP_SET_BLOCK_SIZE 0x4C09
#define LOOP_CONFIGURE  0x4C0A

/* /dev/loop-control interface */
#define LOOP_CTL_ADD  0x4C80
#define LOOP_CTL_REMOVE  0x4C81
#define LOOP_CTL_GET_FREE 0x4C82
#endif /* _UAPI_LINUX_LOOP_H */

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