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 LO_FLAGS_BLOCKSIZE = 32, 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 #define LO_INFO_BLOCKSIZE(l) (l)->lo_init[0] 64 65 /* 66 * Loop filter types 67 */ 68 69 #define LO_CRYPT_NONE 0 70 #define LO_CRYPT_XOR 1 71 #define LO_CRYPT_DES 2 72 #define LO_CRYPT_FISH2 3 /* Twofish encryption */ 73 #define LO_CRYPT_BLOW 4 74 #define LO_CRYPT_CAST128 5 75 #define LO_CRYPT_IDEA 6 76 #define LO_CRYPT_DUMMY 9 77 #define LO_CRYPT_SKIPJACK 10 78 #define LO_CRYPT_CRYPTOAPI 18 79 #define MAX_LO_CRYPT 20 80 81 /* 82 * IOCTL commands --- we will commandeer 0x4C ('L') 83 */ 84 85 #define LOOP_SET_FD 0x4C00 86 #define LOOP_CLR_FD 0x4C01 87 #define LOOP_SET_STATUS 0x4C02 88 #define LOOP_GET_STATUS 0x4C03 89 #define LOOP_SET_STATUS64 0x4C04 90 #define LOOP_GET_STATUS64 0x4C05 91 #define LOOP_CHANGE_FD 0x4C06 92 #define LOOP_SET_CAPACITY 0x4C07 93 #define LOOP_SET_DIRECT_IO 0x4C08 94 95 /* /dev/loop-control interface */ 96 #define LOOP_CTL_ADD 0x4C80 97 #define LOOP_CTL_REMOVE 0x4C81 98 #define LOOP_CTL_GET_FREE 0x4C82 99 #endif /* _UAPI_LINUX_LOOP_H */ 100