2 * (C) 2003 David Woodhouse <dwmw2@infradead.org>
4 * Interface to Linux block layer for MTD 'translation layers'.
8 #ifndef __MTD_TRANS_H__
9 #define __MTD_TRANS_H__
11 #include <linux/mutex.h>
15 struct mtd_blktrans_ops;
19 struct mtd_blktrans_dev {
20 struct mtd_blktrans_ops *tr;
21 struct list_head list;
28 struct task_struct *thread;
29 struct request_queue *rq;
30 spinlock_t queue_lock;
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);
46 int (*discard)(struct mtd_blktrans_dev *dev,
47 unsigned long block, unsigned nr_blocks);
49 /* Block layer ioctls */
50 int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
51 int (*flush)(struct mtd_blktrans_dev *dev);
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);
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);
62 struct list_head devs;
63 struct list_head list;
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__ */