1 /* 2 * Copyright (c) International Business Machines Corp., 2001 3 * Copyright (c) 2013 Oracle and/or its affiliates. All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation; either version 2 of 8 * the License, or (at your option) any later version. 9 * 10 * This program is distributed in the hope that it would be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 18 * 19 * In this header file keep all flags and other 20 * structures that will be needed in both kernel 21 * and user space. Specifically the ioctl flags 22 * will go in here so that in user space a program 23 * can specify flags for the ioctl call. 24 * 25 * HISTORY : 26 * 11/19/2003 Kai Zhao (ltcd3 (at) cn.ibm.com) 27 * 28 * CODE COVERAGE: 74.9% - fs/bio.c (Total Coverage) 29 * 30 */ 31 32 #define TMOD_DRIVER_NAME "ltp test block I/O layer module" 33 #define TBIO_DEVICE_NAME "ltp_tbio" 34 #define DEVICE_NAME "/dev/tbio" 35 #define MAG_NUM 'k' 36 int TBIO_MAJOR; 37 38 #define TBIO_TO_DEV 1 39 #define TBIO_FROM_DEV 2 40 41 /* put ioctl flags here, use the _IO macro which is 42 found in linux/ioctl.h, takes a letter, and an 43 integer */ 44 45 #define LTP_TBIO_CLONE _IO(MAG_NUM,1) 46 #define LTP_TBIO_ALLOC _IO(MAG_NUM,2) 47 #define LTP_TBIO_GET_NR_VECS _IO(MAG_NUM,3) 48 #define LTP_TBIO_PUT _IO(MAG_NUM,4) 49 #define LTP_TBIO_SPLIT _IO(MAG_NUM,5) 50 #define LTP_TBIO_DO_IO _IO(MAG_NUM,6) 51 #define LTP_TBIO_ADD_PAGE _IO(MAG_NUM,7) 52 53 /* memory between the kernel and user space is 54 seperated, so that if a structure is needed 55 to be passed between kernel and user space 56 a call must be made to copy_to_user or copy 57 from user. Use this structure to streamline 58 that process. For example: A function that 59 writes to a disc takes in a ki_write_t 60 pointer from userspace. In the user space 61 program specify the length of the pointer as 62 in_len, and in_data as the actual structure. */ 63 64 struct tbio_interface { 65 void *data; /* input data */ 66 int data_len; /* input data length */ 67 int direction; /* read or write form DEV */ 68 char *cmd; /* read or write */ 69 unsigned short cmd_len; /* length of cmd */ 70 }; 71 typedef struct tbio_interface tbio_interface_t; 72
