linux-imx

/*

 * Copyright (c) International Business Machines Corp., 2006

 *

 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 *

 * Author: Artem Bityutskiy (Битюцкий Артём), Joern Engel

 */

​

/*

 * This is a small driver which implements fake MTD devices on top of UBI

 * volumes. This sounds strange, but it is in fact quite useful to make

 * MTD-oriented software (including all the legacy software) work on top of

 * UBI.

 *

 * Gluebi emulates MTD devices of "MTD_UBIVOLUME" type. Their minimal I/O unit

 * size (@mtd->writesize) is equivalent to the UBI minimal I/O unit. The

 * eraseblock size is equivalent to the logical eraseblock size of the volume.

 */

​

#include <linux/err.h>

#include <linux/list.h>

#include <linux/slab.h>

#include <linux/sched.h>

#include <linux/math64.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/mtd/ubi.h>

#include <linux/mtd/mtd.h>

#include "ubi-media.h"

​

#define err_msg(fmt, ...)                                   \

    pr_err("gluebi (pid %d): %s: " fmt "\n",            \

           current->pid, __func__, ##__VA_ARGS__)

​

/**

 * struct gluebi_device - a gluebi device description data structure.

 * @mtd: emulated MTD device description object

 * @refcnt: gluebi device reference count

 * @desc: UBI volume descriptor

 * @ubi_num: UBI device number this gluebi device works on

 * @vol_id: ID of UBI volume this gluebi device works on

 * @list: link in a list of gluebi devices

 */

struct gluebi_device {

    struct mtd_info mtd;

    int refcnt;

    struct ubi_volume_desc *desc;

    int ubi_num;

    int vol_id;

    struct list_head list;

};