include/linux/mtd/blktrans.h

   1 /*
   2  * $Id: blktrans.h,v 1.6 2005/11/07 11:14:54 gleixner Exp $
   3  *
   4  * (C) 2003 David Woodhouse <dwmw2@infradead.org>
   5  *
   6  * Interface to Linux block layer for MTD 'translation layers'.
   7  *
   8  */
   9
  10 #ifndef __MTD_TRANS_H__
  11 #define __MTD_TRANS_H__
  12
  13 #include <linux/mutex.h>
  14
  15 struct hd_geometry;
  16 struct mtd_info;
  17 struct mtd_blktrans_ops;
  18 struct file;
  19 struct inode;
  20
  21 struct mtd_blktrans_dev {
  22         struct mtd_blktrans_ops *tr;
  23         struct list_head list;
  24         struct mtd_info *mtd;
  25         struct mutex lock;
  26         int devnum;
  27         unsigned long size;
  28         int readonly;
  29         void *blkcore_priv; /* gendisk in 2.5, devfs_handle in 2.4 */
  30 };
  31
  32 struct blkcore_priv; /* Differs for 2.4 and 2.5 kernels; private */
  33
  34 struct mtd_blktrans_ops {
  35         char *name;
  36         int major;
  37         int part_bits;
  38         int blksize;
  39         int blkshift;
  40
  41         /* Access functions */
  42         int (*readsect)(struct mtd_blktrans_dev *dev,
  43                     unsigned long block, char *buffer);
  44         int (*writesect)(struct mtd_blktrans_dev *dev,
  45                      unsigned long block, char *buffer);
  46
  47         /* Block layer ioctls */
  48         int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
  49         int (*flush)(struct mtd_blktrans_dev *dev);
  50
  51         /* Called with mtd_table_mutex held; no race with add/remove */
  52         int (*open)(struct mtd_blktrans_dev *dev);
  53         int (*release)(struct mtd_blktrans_dev *dev);
  54
  55         /* Called on {de,}registration and on subsequent addition/removal
  56            of devices, with mtd_table_mutex held. */
  57         void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd);
  58         void (*remove_dev)(struct mtd_blktrans_dev *dev);
  59
  60         struct list_head devs;
  61         struct list_head list;
  62         struct module *owner;
  63
  64         struct mtd_blkcore_priv *blkcore_priv;
  65 };
  66
  67 extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
  68 extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
  69 extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  70 extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  71
  72
  73 #endif /* __MTD_TRANS_H__ */