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1/* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */2/*3 * Copyright 1993 by Theodore Ts'o.4 */5#ifndef _UAPI_LINUX_LOOP_H6#define _UAPI_LINUX_LOOP_H7 8 9#define LO_NAME_SIZE 6410#define LO_KEY_SIZE 3211 12 13/*14 * Loop flags15 */16enum {17 LO_FLAGS_READ_ONLY = 1,18 LO_FLAGS_AUTOCLEAR = 4,19 LO_FLAGS_PARTSCAN = 8,20 LO_FLAGS_DIRECT_IO = 16,21};22 23/* LO_FLAGS that can be set using LOOP_SET_STATUS(64) */24#define LOOP_SET_STATUS_SETTABLE_FLAGS (LO_FLAGS_AUTOCLEAR | LO_FLAGS_PARTSCAN)25 26/* LO_FLAGS that can be cleared using LOOP_SET_STATUS(64) */27#define LOOP_SET_STATUS_CLEARABLE_FLAGS (LO_FLAGS_AUTOCLEAR)28 29/* LO_FLAGS that can be set using LOOP_CONFIGURE */30#define LOOP_CONFIGURE_SETTABLE_FLAGS (LO_FLAGS_READ_ONLY | LO_FLAGS_AUTOCLEAR \31 | LO_FLAGS_PARTSCAN | LO_FLAGS_DIRECT_IO)32 33#include <asm/posix_types.h> /* for __kernel_old_dev_t */34#include <linux/types.h> /* for __u64 */35 36/* Backwards compatibility version */37struct loop_info {38 int lo_number; /* ioctl r/o */39 __kernel_old_dev_t lo_device; /* ioctl r/o */40 unsigned long lo_inode; /* ioctl r/o */41 __kernel_old_dev_t lo_rdevice; /* ioctl r/o */42 int lo_offset;43 int lo_encrypt_type; /* obsolete, ignored */44 int lo_encrypt_key_size; /* ioctl w/o */45 int lo_flags;46 char lo_name[LO_NAME_SIZE];47 unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */48 unsigned long lo_init[2];49 char reserved[4];50};51 52struct loop_info64 {53 __u64 lo_device; /* ioctl r/o */54 __u64 lo_inode; /* ioctl r/o */55 __u64 lo_rdevice; /* ioctl r/o */56 __u64 lo_offset;57 __u64 lo_sizelimit;/* bytes, 0 == max available */58 __u32 lo_number; /* ioctl r/o */59 __u32 lo_encrypt_type; /* obsolete, ignored */60 __u32 lo_encrypt_key_size; /* ioctl w/o */61 __u32 lo_flags;62 __u8 lo_file_name[LO_NAME_SIZE];63 __u8 lo_crypt_name[LO_NAME_SIZE];64 __u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */65 __u64 lo_init[2];66};67 68/**69 * struct loop_config - Complete configuration for a loop device.70 * @fd: fd of the file to be used as a backing file for the loop device.71 * @block_size: block size to use; ignored if 0.72 * @info: struct loop_info64 to configure the loop device with.73 *74 * This structure is used with the LOOP_CONFIGURE ioctl, and can be used to75 * atomically setup and configure all loop device parameters at once.76 */77struct loop_config {78 __u32 fd;79 __u32 block_size;80 struct loop_info64 info;81 __u64 __reserved[8];82};83 84/*85 * Loop filter types86 */87 88#define LO_CRYPT_NONE 089#define LO_CRYPT_XOR 190#define LO_CRYPT_DES 291#define LO_CRYPT_FISH2 3 /* Twofish encryption */92#define LO_CRYPT_BLOW 493#define LO_CRYPT_CAST128 594#define LO_CRYPT_IDEA 695#define LO_CRYPT_DUMMY 996#define LO_CRYPT_SKIPJACK 1097#define LO_CRYPT_CRYPTOAPI 1898#define MAX_LO_CRYPT 2099 100/*101 * IOCTL commands --- we will commandeer 0x4C ('L')102 */103 104#define LOOP_SET_FD 0x4C00105#define LOOP_CLR_FD 0x4C01106#define LOOP_SET_STATUS 0x4C02107#define LOOP_GET_STATUS 0x4C03108#define LOOP_SET_STATUS64 0x4C04109#define LOOP_GET_STATUS64 0x4C05110#define LOOP_CHANGE_FD 0x4C06111#define LOOP_SET_CAPACITY 0x4C07112#define LOOP_SET_DIRECT_IO 0x4C08113#define LOOP_SET_BLOCK_SIZE 0x4C09114#define LOOP_CONFIGURE 0x4C0A115 116/* /dev/loop-control interface */117#define LOOP_CTL_ADD 0x4C80118#define LOOP_CTL_REMOVE 0x4C81119#define LOOP_CTL_GET_FREE 0x4C82120#endif /* _UAPI_LINUX_LOOP_H */121