1 /* 2 * drivers/block/ublock.c 3 * 4 * Copyright (C) 2010 Google, Inc. 5 * 6 * Author: 7 * Thomas Tuttle <ttuttle@google.com> 8 * 9 * This software is licensed under the terms of the GNU General Public 10 * License version 2, as published by the Free Software Foundation, and 11 * may be copied, distributed, and modified under those terms. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 */ 19 20 #ifndef __UBLOCK_H_ 21 #define __UBLOCK_H_ 22 23 #include <linux/types.h> 24 25 #define UBLOCK_VERSION 0 26 27 enum { 28 UBLOCK_INIT_IN = 0, 29 UBLOCK_INIT_OUT = 1, 30 UBLOCK_READY_IN = 2, 31 UBLOCK_READY_OUT = 3, 32 UBLOCK_READ_IN = 4, 33 UBLOCK_READ_OUT = 5, 34 UBLOCK_WRITE_IN = 6, 35 UBLOCK_WRITE_OUT = 7, 36 }; 37 38 struct ublock_in_header { 39 __u32 seq; 40 __u32 opcode; 41 }; 42 43 struct ublock_out_header { 44 __u32 seq; 45 __u32 opcode; 46 }; 47 48 struct ublock_init_in { 49 __u32 version; 50 __u32 max_buf; 51 __u32 index; 52 }; 53 54 struct ublock_init_out { 55 __u32 version; 56 __u32 max_buf; 57 __u64 size; 58 }; 59 60 struct ublock_ready_in { 61 __u32 _unused; 62 }; 63 64 struct ublock_ready_out { 65 __u32 _unused; 66 }; 67 68 struct ublock_read_in { 69 __u64 offset; 70 __u64 length; 71 }; 72 73 struct ublock_read_out { 74 __s32 status; 75 __u8 data[]; 76 }; 77 78 struct ublock_write_in { 79 __u64 offset; 80 __u64 length; 81 __u8 data[]; 82 }; 83 84 struct ublock_write_out { 85 __s32 status; 86 }; 87 88 #endif 89