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 #include <linux/kref.h> 13 #include <linux/sysfs.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 int open; 30 struct kref ref; 31 struct gendisk *disk; 32 struct attribute_group *disk_attributes; 33 struct task_struct *thread; 34 struct request_queue *rq; 35 spinlock_t queue_lock; 36 void *priv; 37 }; 38 39 struct mtd_blktrans_ops { 40 char *name; 41 int major; 42 int part_bits; 43 int blksize; 44 int blkshift; 45 46 /* Access functions */ 47 int (*readsect)(struct mtd_blktrans_dev *dev, 48 unsigned long block, char *buffer); 49 int (*writesect)(struct mtd_blktrans_dev *dev, 50 unsigned long block, char *buffer); 51 int (*discard)(struct mtd_blktrans_dev *dev, 52 unsigned long block, unsigned nr_blocks); 53 54 /* Block layer ioctls */ 55 int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo); 56 int (*flush)(struct mtd_blktrans_dev *dev); 57 58 /* Called with mtd_table_mutex held; no race with add/remove */ 59 int (*open)(struct mtd_blktrans_dev *dev); 60 int (*release)(struct mtd_blktrans_dev *dev); 61 62 /* Called on {de,}registration and on subsequent addition/removal 63 of devices, with mtd_table_mutex held. */ 64 void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd); 65 void (*remove_dev)(struct mtd_blktrans_dev *dev); 66 67 struct list_head devs; 68 struct list_head list; 69 struct module *owner; 70 }; 71 72 extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr); 73 extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr); 74 extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev); 75 extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev); 76 77 78 #endif /* __MTD_TRANS_H__ */ 79