include/linux/mtd/blktrans.h

   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 #include <linux/kref.h>
  13
  14 struct hd_geometry;
  15 struct mtd_info;
  16 struct mtd_blktrans_ops;
  17 struct file;
  18 struct inode;
  19
  20 struct mtd_blktrans_dev {
  21         struct mtd_blktrans_ops *tr;
  22         struct list_head list;
  23         struct mtd_info *mtd;
  24         struct mutex lock;
  25         int devnum;
  26         unsigned long size;
  27         int readonly;
  28         int open;
  29         struct kref ref;
  30         struct gendisk *disk;
  31         struct task_struct *thread;
  32         struct request_queue *rq;
  33         spinlock_t queue_lock;
  34         void *priv;
  35 };
  36
  37 struct mtd_blktrans_ops {
  38         char *name;
  39         int major;
  40         int part_bits;
  41         int blksize;
  42         int blkshift;
  43
  44         /* Access functions */
  45         int (*readsect)(struct mtd_blktrans_dev *dev,
  46                     unsigned long block, char *buffer);
  47         int (*writesect)(struct mtd_blktrans_dev *dev,
  48                      unsigned long block, char *buffer);
  49         int (*discard)(struct mtd_blktrans_dev *dev,
  50                        unsigned long block, unsigned nr_blocks);
  51
  52         /* Block layer ioctls */
  53         int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
  54         int (*flush)(struct mtd_blktrans_dev *dev);
  55
  56         /* Called with mtd_table_mutex held; no race with add/remove */
  57         int (*open)(struct mtd_blktrans_dev *dev);
  58         int (*release)(struct mtd_blktrans_dev *dev);
  59
  60         /* Called on {de,}registration and on subsequent addition/removal
  61            of devices, with mtd_table_mutex held. */
  62         void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd);
  63         void (*remove_dev)(struct mtd_blktrans_dev *dev);
  64
  65         struct list_head devs;
  66         struct list_head list;
  67         struct module *owner;
  68 };
  69
  70 extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
  71 extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
  72 extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  73 extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  74
  75
  76 #endif /* __MTD_TRANS_H__ */