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