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/*
md.h : Multiple Devices driver for Linux
Copyright (C) 1994-96 Marc ZYNGIER
<zyngier@ufr-info-p7.ibp.fr> or
<maz@gloups.fdn.fr>
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, or (at your option)
any later version.
You should have received a copy of the GNU General Public License
(for example /usr/src/linux/COPYING); if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef _MD_H
#define _MD_H
#include <asm/segment.h>
#include <linux/major.h>
#include <asm/page.h>
#include <linux/ioctl.h>
#define MD_VERSION "0.35"
/* ioctls */
#define REGISTER_DEV _IO (MD_MAJOR, 1)
#define START_MD _IO (MD_MAJOR, 2)
#define STOP_MD _IO (MD_MAJOR, 3)
/*
personalities :
Byte 0 : Chunk size factor
Byte 1 : Fault tolerance count for each physical device
( 0 means no fault tolerance,
0xFF means always tolerate faults), not used by now.
Byte 2 : Personality
Byte 3 : Reserved.
*/
#define FAULT_SHIFT 8
#define PERSONALITY_SHIFT 16
#define FACTOR_MASK 0xFFUL
#define FAULT_MASK 0xFF00UL
#define PERSONALITY_MASK 0xFF0000UL
#define MD_RESERVED 0 /* Not used by now */
#define LINEAR (1UL << PERSONALITY_SHIFT)
#define STRIPED (2UL << PERSONALITY_SHIFT)
#define RAID0 STRIPED
#define RAID1 (3UL << PERSONALITY_SHIFT)
#define RAID5 (4UL << PERSONALITY_SHIFT)
#define MAX_PERSONALITY 5
#ifdef __KERNEL__
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#define MAX_REAL 8 /* Max number of physical dev per md dev */
#define MAX_MD_DEV 4 /* Max number of md dev */
#define FACTOR(a) ((a)->repartition & FACTOR_MASK)
#define MAX_FAULT(a) (((a)->repartition & FAULT_MASK)>>8)
#define PERSONALITY(a) ((a)->repartition & PERSONALITY_MASK)
#define FACTOR_SHIFT(a) (PAGE_SHIFT + (a) - 10)
struct real_dev
{
kdev_t dev; /* Device number */
int size; /* Device size (in blocks) */
int offset; /* Real device offset (in blocks) in md dev
(only used in linear mode) */
struct inode *inode; /* Lock inode */
};
struct md_dev;
struct md_personality
{
char *name;
int (*map)(struct md_dev *md_dev, kdev_t *rdev,
unsigned long *rsector, unsigned long size);
int (*run)(int minor, struct md_dev *md_dev);
int (*stop)(int minor, struct md_dev *md_dev);
int (*status)(char *page, int minor, struct md_dev *md_dev);
int (*ioctl)(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg);
int max_invalid_dev;
};
struct md_dev
{
struct real_dev devices[MAX_REAL];
struct md_personality *pers;
int repartition;
int busy;
int nb_dev;
void *private;
};
extern struct md_dev md_dev[MAX_MD_DEV];
extern int md_size[MAX_MD_DEV];
extern char *partition_name (kdev_t dev);
extern int register_md_personality (int p_num, struct md_personality *p);
extern int unregister_md_personality (int p_num);
#endif __KERNEL__
#endif _MD_H
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