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
  13 struct hd_geometry;
  14 struct mtd_info;
  15 struct mtd_blktrans_ops;
  16 struct file;
  17 struct inode;
  18
  19 struct 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
  30 struct blkcore_priv; /* Differs for 2.4 and 2.5 kernels; private */
  31
  32 struct 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
  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__ */