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;
30 void *blkcore_priv; /* gendisk in 2.5, devfs_handle in 2.4 */
33 struct blkcore_priv; /* Differs for 2.4 and 2.5 kernels; private */
35 struct mtd_blktrans_ops {
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);
46 /* Block layer ioctls */
47 int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
48 int (*flush)(struct mtd_blktrans_dev *dev);
50 /* Called with mtd_table_mutex held; no race with add/remove */
51 int (*open)(struct mtd_blktrans_dev *dev);
52 int (*release)(struct mtd_blktrans_dev *dev);
54 /* Called on {de,}registration and on subsequent addition/removal
55 of devices, with mtd_table_mutex held. */
56 void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd);
57 void (*remove_dev)(struct mtd_blktrans_dev *dev);
59 struct list_head devs;
60 struct list_head list;
63 struct mtd_blkcore_priv *blkcore_priv;
66 extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
67 extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
68 extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
69 extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
72 #endif /* __MTD_TRANS_H__ */