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>
12 #include <linux/kref.h>
16 struct mtd_blktrans_ops;
20 struct mtd_blktrans_dev {
21 struct mtd_blktrans_ops *tr;
22 struct list_head list;
31 struct task_struct *thread;
32 struct request_queue *rq;
33 spinlock_t queue_lock;
37 struct mtd_blktrans_ops {
44 /* Access functions */
45 int (*readsect)(struct mtd_blktrans_dev *dev,
46 unsigned long block, char *buffer);
47 int (*writesect)(struct mtd_blktrans_dev *dev,
48 unsigned long block, char *buffer);
49 int (*discard)(struct mtd_blktrans_dev *dev,
50 unsigned long block, unsigned nr_blocks);
52 /* Block layer ioctls */
53 int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
54 int (*flush)(struct mtd_blktrans_dev *dev);
56 /* Called with mtd_table_mutex held; no race with add/remove */
57 int (*open)(struct mtd_blktrans_dev *dev);
58 int (*release)(struct mtd_blktrans_dev *dev);
60 /* Called on {de,}registration and on subsequent addition/removal
61 of devices, with mtd_table_mutex held. */
62 void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd);
63 void (*remove_dev)(struct mtd_blktrans_dev *dev);
65 struct list_head devs;
66 struct list_head list;
70 extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
71 extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
72 extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
73 extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
76 #endif /* __MTD_TRANS_H__ */