blktrans.h 1.9 KB

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  1. /*
  2. * $Id: blktrans.h,v 1.1.1.1 2007/06/12 07:27:16 eyryu Exp $
  3. *
  4. * (C) 2003 David Woodhouse <dwmw2@infradead.org>
  5. *
  6. * Interface to Linux block layer for MTD 'translation layers'.
  7. *
  8. */
  9. #ifndef __MTD_TRANS_H__
  10. #define __MTD_TRANS_H__
  11. #include <linux/mutex.h>
  12. struct hd_geometry;
  13. struct mtd_info;
  14. struct mtd_blktrans_ops;
  15. struct file;
  16. struct inode;
  17. struct mtd_blktrans_dev {
  18. struct mtd_blktrans_ops *tr;
  19. struct list_head list;
  20. struct mtd_info *mtd;
  21. struct mutex lock;
  22. int devnum;
  23. unsigned long size;
  24. int readonly;
  25. void *blkcore_priv; /* gendisk in 2.5, devfs_handle in 2.4 */
  26. };
  27. struct blkcore_priv; /* Differs for 2.4 and 2.5 kernels; private */
  28. struct mtd_blktrans_ops {
  29. char *name;
  30. int major;
  31. int part_bits;
  32. int blksize;
  33. int blkshift;
  34. /* Access functions */
  35. int (*readsect)(struct mtd_blktrans_dev *dev,
  36. unsigned long block, char *buffer);
  37. int (*writesect)(struct mtd_blktrans_dev *dev,
  38. unsigned long block, char *buffer);
  39. /* Block layer ioctls */
  40. int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
  41. int (*flush)(struct mtd_blktrans_dev *dev);
  42. /* Called with mtd_table_mutex held; no race with add/remove */
  43. int (*open)(struct mtd_blktrans_dev *dev);
  44. int (*release)(struct mtd_blktrans_dev *dev);
  45. /* Called on {de,}registration and on subsequent addition/removal
  46. of devices, with mtd_table_mutex held. */
  47. void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd);
  48. void (*remove_dev)(struct mtd_blktrans_dev *dev);
  49. struct list_head devs;
  50. struct list_head list;
  51. struct module *owner;
  52. struct mtd_blkcore_priv *blkcore_priv;
  53. };
  54. extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
  55. extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
  56. extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  57. extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  58. #endif /* __MTD_TRANS_H__ */