1 /* 2 * (C) 2003 David Woodhouse <[email protected]> 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