testcases/kernel/device-drivers/tbio/kernel_space/tbio.h

/*
 *
 *   Copyright (c) International Business Machines  Corp., 2001
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *

 * In this header file keep all flags and other 
 * structures that will be needed in both kernel
 * and user space. Specifically the ioctl flags
 * will go in here so that in user space a program 
 * can specify flags for the ioctl call.
 * 
 * module: tbio
 *  Copyright (c) International Business Machines  Corp., 2003
 *
 *  This program is free software;  you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *  the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program;  
 *
 *  FILE        : tbio.h
 *  USAGE       : kernel_space:./load_tbio.sh
 *                user_space  :./test_bio
 *
 *  DESCRIPTION : The module will test block i/o layer for kernel 2.5
 *  REQUIREMENTS:
 *                1) glibc 2.1.91 or above.
 *
 *  HISTORY     :
 *      11/19/2003 Kai Zhao (ltcd3@cn.ibm.com)
 *
 *  CODE COVERAGE: 74.9% - fs/bio.c (Total Coverage)
 *
 */

#define TMOD_DRIVER_NAME	"ltp test block I/O layer module"
#define DEVICE_NAME		"/dev/tbio"
#define MAG_NUM			'k'
#define TBIO_MAJOR      258 

#define TBIO_TO_DEV              1
#define TBIO_FROM_DEV            2

/* put ioctl flags here, use the _IO macro which is 
 found in linux/ioctl.h, takes a letter, and an 
 integer */

#define LTP_TBIO_CLONE		_IO(MAG_NUM,1)
#define LTP_TBIO_ALLOC		_IO(MAG_NUM,2)
#define LTP_TBIO_GET_NR_VECS	_IO(MAG_NUM,3)
#define LTP_TBIO_PUT		_IO(MAG_NUM,4)
#define LTP_TBIO_SPLIT		_IO(MAG_NUM,5)
#define LTP_TBIO_DO_IO		_IO(MAG_NUM,6)
#define LTP_TBIO_ADD_PAGE	_IO(MAG_NUM,7)

/* memory between the kernel and user space is
 seperated, so that if a structure is needed 
 to be passed between kernel and user space 
 a call must be made to copy_to_user or copy
 from user. Use this structure to streamline 
 that process. For example: A function that 
 writes to a disc takes in a ki_write_t 
 pointer from userspace. In the user space 
 program specify the length of the pointer as 
 in_len, and in_data as the actual structure. */

struct tbio_interface {
	void  *data;         // input data
	int     data_len;         // input data length        
	int     direction;      // read or write form DEV
	unsigned char *cmd;     // read or write
	int   cmd_len;          // length of cmd
};
typedef struct tbio_interface tbio_interface_t;