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