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 #include <asm/posix_types.h> /* for __kernel_old_dev_t */ 29 #include <linux/types.h> /* for __u64 */ 30 31 /* Backwards compatibility version */ 32 struct loop_info { 33 int lo_number; /* ioctl r/o */ 34 __kernel_old_dev_t lo_device; /* ioctl r/o */ 35 unsigned long lo_inode; /* ioctl r/o */ 36 __kernel_old_dev_t lo_rdevice; /* ioctl r/o */ 37 int lo_offset; 38 int lo_encrypt_type; 39 int lo_encrypt_key_size; /* ioctl w/o */ 40 int lo_flags; /* ioctl r/o */ 41 char lo_name[LO_NAME_SIZE]; 42 unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ 43 unsigned long lo_init[2]; 44 char reserved[4]; 45 }; 46 47 struct loop_info64 { 48 __u64 lo_device; /* ioctl r/o */ 49 __u64 lo_inode; /* ioctl r/o */ 50 __u64 lo_rdevice; /* ioctl r/o */ 51 __u64 lo_offset; 52 __u64 lo_sizelimit;/* bytes, 0 == max available */ 53 __u32 lo_number; /* ioctl r/o */ 54 __u32 lo_encrypt_type; 55 __u32 lo_encrypt_key_size; /* ioctl w/o */ 56 __u32 lo_flags; /* ioctl r/o */ 57 __u8 lo_file_name[LO_NAME_SIZE]; 58 __u8 lo_crypt_name[LO_NAME_SIZE]; 59 __u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ 60 __u64 lo_init[2]; 61 }; 62 63 /* 64 * Loop filter types 65 */ 66 67 #define LO_CRYPT_NONE 0 68 #define LO_CRYPT_XOR 1 69 #define LO_CRYPT_DES 2 70 #define LO_CRYPT_FISH2 3 /* Twofish encryption */ 71 #define LO_CRYPT_BLOW 4 72 #define LO_CRYPT_CAST128 5 73 #define LO_CRYPT_IDEA 6 74 #define LO_CRYPT_DUMMY 9 75 #define LO_CRYPT_SKIPJACK 10 76 #define LO_CRYPT_CRYPTOAPI 18 77 #define MAX_LO_CRYPT 20 78 79 /* 80 * IOCTL commands --- we will commandeer 0x4C ('L') 81 */ 82 83 #define LOOP_SET_FD 0x4C00 84 #define LOOP_CLR_FD 0x4C01 85 #define LOOP_SET_STATUS 0x4C02 86 #define LOOP_GET_STATUS 0x4C03 87 #define LOOP_SET_STATUS64 0x4C04 88 #define LOOP_GET_STATUS64 0x4C05 89 #define LOOP_CHANGE_FD 0x4C06 90 #define LOOP_SET_CAPACITY 0x4C07 91 #define LOOP_SET_DIRECT_IO 0x4C08 92 #define LOOP_SET_BLOCK_SIZE 0x4C09 93 94 /* /dev/loop-control interface */ 95 #define LOOP_CTL_ADD 0x4C80 96 #define LOOP_CTL_REMOVE 0x4C81 97 #define LOOP_CTL_GET_FREE 0x4C82 98 #endif /* _UAPI_LINUX_LOOP_H */ 99
