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include/linux/mtd/blktrans.h
1.85 KB
1da177e4c
Linux-2.6.12-rc2
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/*
* $Id: blktrans.h,v 1.5 2003/06/23 12:00:08 dwmw2 Exp $
*
* (C) 2003 David Woodhouse <dwmw2@infradead.org>
*
* Interface to Linux block layer for MTD 'translation layers'.
*
*/
#ifndef __MTD_TRANS_H__
#define __MTD_TRANS_H__
#include <asm/semaphore.h>
struct hd_geometry;
struct mtd_info;
struct mtd_blktrans_ops;
struct file;
struct inode;
struct mtd_blktrans_dev {
struct mtd_blktrans_ops *tr;
struct list_head list;
struct mtd_info *mtd;
struct semaphore sem;
int devnum;
int blksize;
unsigned long size;
int readonly;
void *blkcore_priv; /* gendisk in 2.5, devfs_handle in 2.4 */
};
struct blkcore_priv; /* Differs for 2.4 and 2.5 kernels; private */
struct mtd_blktrans_ops {
char *name;
int major;
int part_bits;
/* Access functions */
int (*readsect)(struct mtd_blktrans_dev *dev,
unsigned long block, char *buffer);
int (*writesect)(struct mtd_blktrans_dev *dev,
unsigned long block, char *buffer);
/* Block layer ioctls */
int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
int (*flush)(struct mtd_blktrans_dev *dev);
/* Called with mtd_table_mutex held; no race with add/remove */
int (*open)(struct mtd_blktrans_dev *dev);
int (*release)(struct mtd_blktrans_dev *dev);
/* Called on {de,}registration and on subsequent addition/removal
of devices, with mtd_table_mutex held. */
void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd);
void (*remove_dev)(struct mtd_blktrans_dev *dev);
struct list_head devs;
struct list_head list;
struct module *owner;
struct mtd_blkcore_priv *blkcore_priv;
};
extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
#endif /* __MTD_TRANS_H__ */
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