1 /* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */ 2 /* 3 * include/linux/loop.h 4 * 5 * Written by Theodore Ts'o, 3/29/93. 6 * 7 * Copyright 1993 by Theodore Ts'o. Redistribution of this file is 8 * permitted under the GNU General Public License. 9 */ 10 #ifndef _UAPI_LINUX_LOOP_H 11 #define _UAPI_LINUX_LOOP_H 12 13 14 #define LO_NAME_SIZE 64 15 #define LO_KEY_SIZE 32 16 17 18 /* 19 * Loop flags 20 */ 21 enum { 22 LO_FLAGS_READ_ONLY = 1, 23 LO_FLAGS_AUTOCLEAR = 4, 24 LO_FLAGS_PARTSCAN = 8, 25 LO_FLAGS_DIRECT_IO = 16, 26 }; 27 28 /* LO_FLAGS that can be set using LOOP_SET_STATUS(64) */ 29 #define LOOP_SET_STATUS_SETTABLE_FLAGS (LO_FLAGS_AUTOCLEAR | LO_FLAGS_PARTSCAN) 30 31 /* LO_FLAGS that can be cleared using LOOP_SET_STATUS(64) */ 32 #define LOOP_SET_STATUS_CLEARABLE_FLAGS (LO_FLAGS_AUTOCLEAR) 33 34 #include <asm/posix_types.h> /* for __kernel_old_dev_t */ 35 #include <linux/types.h> /* for __u64 */ 36 37 /* Backwards compatibility version */ 38 struct loop_info { 39 int lo_number; /* ioctl r/o */ 40 __kernel_old_dev_t lo_device; /* ioctl r/o */ 41 unsigned long lo_inode; /* ioctl r/o */ 42 __kernel_old_dev_t lo_rdevice; /* ioctl r/o */ 43 int lo_offset; 44 int lo_encrypt_type; 45 int lo_encrypt_key_size; /* ioctl w/o */ 46 int lo_flags; 47 char lo_name[LO_NAME_SIZE]; 48 unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ 49 unsigned long lo_init[2]; 50 char reserved[4]; 51 }; 52 53 struct loop_info64 { 54 __u64 lo_device; /* ioctl r/o */ 55 __u64 lo_inode; /* ioctl r/o */ 56 __u64 lo_rdevice; /* ioctl r/o */ 57 __u64 lo_offset; 58 __u64 lo_sizelimit;/* bytes, 0 == max available */ 59 __u32 lo_number; /* ioctl r/o */ 60 __u32 lo_encrypt_type; 61 __u32 lo_encrypt_key_size; /* ioctl w/o */ 62 __u32 lo_flags; 63 __u8 lo_file_name[LO_NAME_SIZE]; 64 __u8 lo_crypt_name[LO_NAME_SIZE]; 65 __u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ 66 __u64 lo_init[2]; 67 }; 68 69 /* 70 * Loop filter types 71 */ 72 73 #define LO_CRYPT_NONE 0 74 #define LO_CRYPT_XOR 1 75 #define LO_CRYPT_DES 2 76 #define LO_CRYPT_FISH2 3 /* Twofish encryption */ 77 #define LO_CRYPT_BLOW 4 78 #define LO_CRYPT_CAST128 5 79 #define LO_CRYPT_IDEA 6 80 #define LO_CRYPT_DUMMY 9 81 #define LO_CRYPT_SKIPJACK 10 82 #define LO_CRYPT_CRYPTOAPI 18 83 #define MAX_LO_CRYPT 20 84 85 /* 86 * IOCTL commands --- we will commandeer 0x4C ('L') 87 */ 88 89 #define LOOP_SET_FD 0x4C00 90 #define LOOP_CLR_FD 0x4C01 91 #define LOOP_SET_STATUS 0x4C02 92 #define LOOP_GET_STATUS 0x4C03 93 #define LOOP_SET_STATUS64 0x4C04 94 #define LOOP_GET_STATUS64 0x4C05 95 #define LOOP_CHANGE_FD 0x4C06 96 #define LOOP_SET_CAPACITY 0x4C07 97 #define LOOP_SET_DIRECT_IO 0x4C08 98 #define LOOP_SET_BLOCK_SIZE 0x4C09 99 100 /* /dev/loop-control interface */ 101 #define LOOP_CTL_ADD 0x4C80 102 #define LOOP_CTL_REMOVE 0x4C81 103 #define LOOP_CTL_GET_FREE 0x4C82 104 #endif /* _UAPI_LINUX_LOOP_H */ 105