LXR linux/include/linux/mtd/blktrans.h

   1/*
   2 * Copyright © 2003-2010 David Woodhouse <dwmw2@infradead.org>
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License as published by
   6 * the Free Software Foundation; either version 2 of the License, or
   7 * (at your option) any later version.
   8 *
   9 * This program is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write to the Free Software
  16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 *
  18 */
  19
  20#ifndef __MTD_TRANS_H__
  21#define __MTD_TRANS_H__
  22
  23#include <linux/mutex.h>
  24#include <linux/kref.h>
  25#include <linux/sysfs.h>
  26#include <linux/workqueue.h>
  27
  28struct hd_geometry;
  29struct mtd_info;
  30struct mtd_blktrans_ops;
  31struct file;
  32struct inode;
  33
  34struct mtd_blktrans_dev {
  35        struct mtd_blktrans_ops *tr;
  36        struct list_head list;
  37        struct mtd_info *mtd;
  38        struct mutex lock;
  39        int devnum;
  40        bool bg_stop;
  41        unsigned long size;
  42        int readonly;
  43        int open;
  44        struct kref ref;
  45        struct gendisk *disk;
  46        struct attribute_group *disk_attributes;
  47        struct workqueue_struct *wq;
  48        struct work_struct work;
  49        struct request_queue *rq;
  50        spinlock_t queue_lock;
  51        void *priv;
  52        fmode_t file_mode;
  53};
  54
  55struct mtd_blktrans_ops {
  56        char *name;
  57        int major;
  58        int part_bits;
  59        int blksize;
  60        int blkshift;
  61
  62        /* Access functions */
  63        int (*readsect)(struct mtd_blktrans_dev *dev,
  64                    unsigned long block, char *buffer);
  65        int (*writesect)(struct mtd_blktrans_dev *dev,
  66                     unsigned long block, char *buffer);
  67        int (*discard)(struct mtd_blktrans_dev *dev,
  68                       unsigned long block, unsigned nr_blocks);
  69        void (*background)(struct mtd_blktrans_dev *dev);
  70
  71        /* Block layer ioctls */
  72        int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
  73        int (*flush)(struct mtd_blktrans_dev *dev);
  74
  75        /* Called with mtd_table_mutex held; no race with add/remove */
  76        int (*open)(struct mtd_blktrans_dev *dev);
  77        void (*release)(struct mtd_blktrans_dev *dev);
  78
  79        /* Called on {de,}registration and on subsequent addition/removal
  80           of devices, with mtd_table_mutex held. */
  81        void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd);
  82        void (*remove_dev)(struct mtd_blktrans_dev *dev);
  83
  84        struct list_head devs;
  85        struct list_head list;
  86        struct module *owner;
  87};
  88
  89extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
  90extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
  91extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  92extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  93extern int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev);
  94
  95
  96#endif /* __MTD_TRANS_H__ */
  97