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loop.h
/* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */ /* * 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 General Public License. */ #ifndef _LINUX_LOOP_H #define _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; 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; __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 /* _LINUX_LOOP_H */
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