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/*

 * $Id: blktrans.h,v 1.6 2005/11/07 11:14:54 gleixner 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 <linux/mutex.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 mutex lock;

        int devnum;

        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;

        int blksize;

        int blkshift;

        /* 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__ */