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
  27struct hd_geometry;
  28struct mtd_info;
  29struct mtd_blktrans_ops;
  30struct file;
  31struct inode;
  32
  33struct mtd_blktrans_dev {
  34        struct mtd_blktrans_ops *tr;
  35        struct list_head list;
  36        struct mtd_info *mtd;
  37        struct mutex lock;
  38        int devnum;
  39        bool bg_stop;
  40        unsigned long size;
  41        int readonly;
  42        int open;
  43        struct kref ref;
  44        struct gendisk *disk;
  45        struct attribute_group *disk_attributes;
  46        struct task_struct *thread;
  47        struct request_queue *rq;
  48        spinlock_t queue_lock;
  49        void *priv;
  50};
  51
  52struct mtd_blktrans_ops {
  53        char *name;
  54        int major;
  55        int part_bits;
  56        int blksize;
  57        int blkshift;
  58
  59        /* Access functions */
  60        int (*readsect)(struct mtd_blktrans_dev *dev,
  61                    unsigned long block, char *buffer);
  62        int (*writesect)(struct mtd_blktrans_dev *dev,
  63                     unsigned long block, char *buffer);
  64        int (*discard)(struct mtd_blktrans_dev *dev,
  65                       unsigned long block, unsigned nr_blocks);
  66        void (*background)(struct mtd_blktrans_dev *dev);
  67
  68        /* Block layer ioctls */
  69        int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
  70        int (*flush)(struct mtd_blktrans_dev *dev);
  71
  72        /* Called with mtd_table_mutex held; no race with add/remove */
  73        int (*open)(struct mtd_blktrans_dev *dev);
  74        int (*release)(struct mtd_blktrans_dev *dev);
  75
  76        /* Called on {de,}registration and on subsequent addition/removal
  77           of devices, with mtd_table_mutex held. */
  78        void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd);
  79        void (*remove_dev)(struct mtd_blktrans_dev *dev);
  80
  81        struct list_head devs;
  82        struct list_head list;
  83        struct module *owner;
  84};
  85
  86extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
  87extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
  88extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  89extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  90extern int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev);
  91
  92
  93#endif /* __MTD_TRANS_H__ */
  94