root/include/linux/mtd/blktrans.h

INCLUDED FROM

/*
 * Copyright © 2003-2010 David Woodhouse <dwmw2@infradead.org>
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifndef __MTD_TRANS_H__
#define __MTD_TRANS_H__

#include <linux/mutex.h>
#include <linux/kref.h>
#include <linux/sysfs.h>
#include <linux/workqueue.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;
        bool bg_stop;
        unsigned long size;
        int readonly;
        int open;
        struct kref ref;
        struct gendisk *disk;
        struct attribute_group *disk_attributes;
        struct workqueue_struct *wq;
        struct work_struct work;
        struct request_queue *rq;
        spinlock_t queue_lock;
        void *priv;
        fmode_t file_mode;
};

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);
        int (*discard)(struct mtd_blktrans_dev *dev,
                       unsigned long block, unsigned nr_blocks);
        void (*background)(struct mtd_blktrans_dev *dev);

        /* 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);
        void (*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;
};

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);
extern int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev);


#endif /* __MTD_TRANS_H__ */