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/*
 * $Id: blktrans.h,v 1.1 2004-01-28 15:30:48 giacomo 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__ */