1 /* 2 * $Id: blktrans.h,v 1.6 2005/11/07 11:14:54 gleixner Exp $ 3 * 4 * (C) 2003 David Woodhouse <dwmw2@infradead.org> 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 int blksize; 28 unsigned long size; 29 int readonly; 30 void *blkcore_priv; /* gendisk in 2.5, devfs_handle in 2.4 */ 31 }; 32 33 struct blkcore_priv; /* Differs for 2.4 and 2.5 kernels; private */ 34 35 struct mtd_blktrans_ops { 36 char *name; 37 int major; 38 int part_bits; 39 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); 45 46 /* Block layer ioctls */ 47 int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo); 48 int (*flush)(struct mtd_blktrans_dev *dev); 49 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); 53 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); 58 59 struct list_head devs; 60 struct list_head list; 61 struct module *owner; 62 63 struct mtd_blkcore_priv *blkcore_priv; 64 }; 65 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); 70 71 72 #endif /* __MTD_TRANS_H__ */ 73