include/linux/mtd/blktrans.h

   1 /*
   2  * $Id: blktrans.h,v 1.5 2003/06/23 12:00:08 dwmw2 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 <asm/semaphore.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 semaphore sem;
  26         int devnum;
  27         int blksize;
  28         unsigned long size;
  29         int readonly;
  30         void *blkcore_priv; /* gendisk in 2.5, devfs_handle in 2.4 */
  31 };
  32
  33 struct blkcore_priv; /* Differs for 2.4 and 2.5 kernels; private */
  34
  35 struct mtd_blktrans_ops {
  36         char *name;
  37         int major;
  38         int part_bits;
  39
  40         /* Access functions */
  41         int (*readsect)(struct mtd_blktrans_dev *dev,
  42                     unsigned long block, char *buffer);
  43         int (*writesect)(struct mtd_blktrans_dev *dev,
  44                      unsigned long block, char *buffer);
  45 #ifdef CONFIG_MAGIC_ROM_PTR
  46         int (*romptr)(struct mtd_blktrans_dev *dev, struct vm_area_struct * vma);
  47 #endif /* CONFIG_MAGIC_ROM_PTR */
  48
  49         /* Block layer ioctls */
  50         int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
  51         int (*flush)(struct mtd_blktrans_dev *dev);
  52
  53         /* Called with mtd_table_mutex held; no race with add/remove */
  54         int (*open)(struct mtd_blktrans_dev *dev);
  55         int (*release)(struct mtd_blktrans_dev *dev);
  56
  57         /* Called on {de,}registration and on subsequent addition/removal
  58            of devices, with mtd_table_mutex held. */
  59         void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd);
  60         void (*remove_dev)(struct mtd_blktrans_dev *dev);
  61
  62         struct list_head devs;
  63         struct list_head list;
  64         struct module *owner;
  65
  66         struct mtd_blkcore_priv *blkcore_priv;
  67 };
  68
  69 extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
  70 extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
  71 extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  72 extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  73
  74
  75 #endif /* __MTD_TRANS_H__ */