LXR linux/include/linux/mtd/blktrans.h

   1/*
   2 * (C) 2003 David Woodhouse <dwmw2@infradead.org>
   3 *
   4 * Interface to Linux block layer for MTD 'translation layers'.
   5 *
   6 */
   7
   8#ifndef __MTD_TRANS_H__
   9#define __MTD_TRANS_H__
  10
  11#include <linux/mutex.h>
  12
  13struct hd_geometry;
  14struct mtd_info;
  15struct mtd_blktrans_ops;
  16struct file;
  17struct inode;
  18
  19struct mtd_blktrans_dev {
  20        struct mtd_blktrans_ops *tr;
  21        struct list_head list;
  22        struct mtd_info *mtd;
  23        struct mutex lock;
  24        int devnum;
  25        unsigned long size;
  26        int readonly;
  27        void *blkcore_priv; /* gendisk in 2.5, devfs_handle in 2.4 */
  28};
  29
  30struct blkcore_priv; /* Differs for 2.4 and 2.5 kernels; private */
  31
  32struct mtd_blktrans_ops {
  33        char *name;
  34        int major;
  35        int part_bits;
  36        int blksize;
  37        int blkshift;
  38
  39        /* Access functions */
  40        int (*readsect)(struct mtd_blktrans_dev *dev,
  41                    unsigned long block, char *buffer);
  42        int (*writesect)(struct mtd_blktrans_dev *dev,
  43                     unsigned long block, char *buffer);
  44        int (*discard)(struct mtd_blktrans_dev *dev,
  45                       unsigned long block, unsigned nr_blocks);
  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
  67extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
  68extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
  69extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  70extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  71
  72
  73#endif /* __MTD_TRANS_H__ */
  74