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__ */
74
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