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
  27 struct hd_geometry;
  28 struct mtd_info;
  29 struct mtd_blktrans_ops;
  30 struct file;
  31 struct inode;
  32
  33 struct 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
  52 struct 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
  86 extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
  87 extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
  88 extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  89 extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  90 extern int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev);
  91
  92
  93 #endif /* __MTD_TRANS_H__ */