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 #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__ */