xref: /linux-6.15/include/linux/mtd/blktrans.h (revision 643d1f7f)
1 /*
2  * $Id: blktrans.h,v 1.6 2005/11/07 11:14:54 gleixner Exp $
3  *
4  * (C) 2003 David Woodhouse <[email protected]>
5  *
6  * Interface to Linux block layer for MTD 'translation layers'.
7  *
8  */
9 
10 #ifndef __MTD_TRANS_H__
11 #define __MTD_TRANS_H__
12 
13 #include <linux/mutex.h>
14 
15 struct hd_geometry;
16 struct mtd_info;
17 struct mtd_blktrans_ops;
18 struct file;
19 struct inode;
20 
21 struct mtd_blktrans_dev {
22 	struct mtd_blktrans_ops *tr;
23 	struct list_head list;
24 	struct mtd_info *mtd;
25 	struct mutex lock;
26 	int devnum;
27 	unsigned long size;
28 	int readonly;
29 	void *blkcore_priv; /* gendisk in 2.5, devfs_handle in 2.4 */
30 };
31 
32 struct blkcore_priv; /* Differs for 2.4 and 2.5 kernels; private */
33 
34 struct mtd_blktrans_ops {
35 	char *name;
36 	int major;
37 	int part_bits;
38 	int blksize;
39 	int blkshift;
40 
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 
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