2 * $Id: blktrans.h,v 1.6 2005/11/07 11:14:54 gleixner Exp $
4 * (C) 2003 David Woodhouse <dwmw2@infradead.org>
6 * Interface to Linux block layer for MTD 'translation layers'.
10 #ifndef __MTD_TRANS_H__
11 #define __MTD_TRANS_H__
13 #include <linux/mutex.h>
17 struct mtd_blktrans_ops;
21 struct mtd_blktrans_dev {
22 struct mtd_blktrans_ops *tr;
23 struct list_head list;
29 void *blkcore_priv; /* gendisk in 2.5, devfs_handle in 2.4 */
32 struct blkcore_priv; /* Differs for 2.4 and 2.5 kernels; private */
34 struct mtd_blktrans_ops {
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);
47 /* Block layer ioctls */
48 int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
49 int (*flush)(struct mtd_blktrans_dev *dev);
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);
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);
60 struct list_head devs;
61 struct list_head list;
64 struct mtd_blkcore_priv *blkcore_priv;
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);
73 #endif /* __MTD_TRANS_H__ */