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125 lines
3.4 KiB
125 lines
3.4 KiB
/* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */ |
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/* |
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* include/linux/loop.h |
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* |
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* Written by Theodore Ts'o, 3/29/93. |
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* |
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* Copyright 1993 by Theodore Ts'o. Redistribution of this file is |
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* permitted under the GNU General Public License. |
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*/ |
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#ifndef _UAPI_LINUX_LOOP_H |
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#define _UAPI_LINUX_LOOP_H |
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#define LO_NAME_SIZE 64 |
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#define LO_KEY_SIZE 32 |
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/* |
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* Loop flags |
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*/ |
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enum { |
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LO_FLAGS_READ_ONLY = 1, |
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LO_FLAGS_AUTOCLEAR = 4, |
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LO_FLAGS_PARTSCAN = 8, |
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LO_FLAGS_DIRECT_IO = 16, |
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}; |
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/* LO_FLAGS that can be set using LOOP_SET_STATUS(64) */ |
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#define LOOP_SET_STATUS_SETTABLE_FLAGS (LO_FLAGS_AUTOCLEAR | LO_FLAGS_PARTSCAN) |
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/* LO_FLAGS that can be cleared using LOOP_SET_STATUS(64) */ |
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#define LOOP_SET_STATUS_CLEARABLE_FLAGS (LO_FLAGS_AUTOCLEAR) |
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/* LO_FLAGS that can be set using LOOP_CONFIGURE */ |
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#define LOOP_CONFIGURE_SETTABLE_FLAGS (LO_FLAGS_READ_ONLY | LO_FLAGS_AUTOCLEAR \ |
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| LO_FLAGS_PARTSCAN | LO_FLAGS_DIRECT_IO) |
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#include <asm/posix_types.h> /* for __kernel_old_dev_t */ |
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#include <linux/types.h> /* for __u64 */ |
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/* Backwards compatibility version */ |
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struct loop_info { |
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int lo_number; /* ioctl r/o */ |
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__kernel_old_dev_t lo_device; /* ioctl r/o */ |
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unsigned long lo_inode; /* ioctl r/o */ |
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__kernel_old_dev_t lo_rdevice; /* ioctl r/o */ |
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int lo_offset; |
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int lo_encrypt_type; |
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int lo_encrypt_key_size; /* ioctl w/o */ |
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int lo_flags; |
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char lo_name[LO_NAME_SIZE]; |
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unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ |
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unsigned long lo_init[2]; |
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char reserved[4]; |
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}; |
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struct loop_info64 { |
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__u64 lo_device; /* ioctl r/o */ |
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__u64 lo_inode; /* ioctl r/o */ |
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__u64 lo_rdevice; /* ioctl r/o */ |
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__u64 lo_offset; |
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__u64 lo_sizelimit;/* bytes, 0 == max available */ |
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__u32 lo_number; /* ioctl r/o */ |
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__u32 lo_encrypt_type; |
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__u32 lo_encrypt_key_size; /* ioctl w/o */ |
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__u32 lo_flags; |
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__u8 lo_file_name[LO_NAME_SIZE]; |
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__u8 lo_crypt_name[LO_NAME_SIZE]; |
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__u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ |
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__u64 lo_init[2]; |
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}; |
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/** |
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* struct loop_config - Complete configuration for a loop device. |
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* @fd: fd of the file to be used as a backing file for the loop device. |
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* @block_size: block size to use; ignored if 0. |
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* @info: struct loop_info64 to configure the loop device with. |
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* |
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* This structure is used with the LOOP_CONFIGURE ioctl, and can be used to |
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* atomically setup and configure all loop device parameters at once. |
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*/ |
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struct loop_config { |
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__u32 fd; |
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__u32 block_size; |
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struct loop_info64 info; |
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__u64 __reserved[8]; |
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}; |
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/* |
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* Loop filter types |
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*/ |
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#define LO_CRYPT_NONE 0 |
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#define LO_CRYPT_XOR 1 |
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#define LO_CRYPT_DES 2 |
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#define LO_CRYPT_FISH2 3 /* Twofish encryption */ |
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#define LO_CRYPT_BLOW 4 |
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#define LO_CRYPT_CAST128 5 |
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#define LO_CRYPT_IDEA 6 |
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#define LO_CRYPT_DUMMY 9 |
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#define LO_CRYPT_SKIPJACK 10 |
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#define LO_CRYPT_CRYPTOAPI 18 |
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#define MAX_LO_CRYPT 20 |
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/* |
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* IOCTL commands --- we will commandeer 0x4C ('L') |
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*/ |
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#define LOOP_SET_FD 0x4C00 |
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#define LOOP_CLR_FD 0x4C01 |
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#define LOOP_SET_STATUS 0x4C02 |
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#define LOOP_GET_STATUS 0x4C03 |
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#define LOOP_SET_STATUS64 0x4C04 |
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#define LOOP_GET_STATUS64 0x4C05 |
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#define LOOP_CHANGE_FD 0x4C06 |
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#define LOOP_SET_CAPACITY 0x4C07 |
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#define LOOP_SET_DIRECT_IO 0x4C08 |
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#define LOOP_SET_BLOCK_SIZE 0x4C09 |
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#define LOOP_CONFIGURE 0x4C0A |
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/* /dev/loop-control interface */ |
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#define LOOP_CTL_ADD 0x4C80 |
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#define LOOP_CTL_REMOVE 0x4C81 |
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#define LOOP_CTL_GET_FREE 0x4C82 |
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#endif /* _UAPI_LINUX_LOOP_H */
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