LXR linux/include/linux/mtd/blktrans.h

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * Copyright © 2003-2010 David Woodhouse <dwmw2@infradead.org>
   4 */
   5
   6#ifndef __MTD_TRANS_H__
   7#define __MTD_TRANS_H__
   8
   9#include <linux/mutex.h>
  10#include <linux/kref.h>
  11#include <linux/sysfs.h>
  12
  13struct hd_geometry;
  14struct mtd_info;
  15struct mtd_blktrans_ops;
  16struct file;
  17struct inode;
  18
  19struct 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        bool bg_stop;
  26        unsigned long size;
  27        int readonly;
  28        int open;
  29        struct kref ref;
  30        struct gendisk *disk;
  31        struct attribute_group *disk_attributes;
  32        struct request_queue *rq;
  33        struct list_head rq_list;
  34        struct blk_mq_tag_set *tag_set;
  35        spinlock_t queue_lock;
  36        void *priv;
  37        fmode_t file_mode;
  38};
  39
  40struct mtd_blktrans_ops {
  41        char *name;
  42        int major;
  43        int part_bits;
  44        int blksize;
  45        int blkshift;
  46
  47        /* Access functions */
  48        int (*readsect)(struct mtd_blktrans_dev *dev,
  49                    unsigned long block, char *buffer);
  50        int (*writesect)(struct mtd_blktrans_dev *dev,
  51                     unsigned long block, char *buffer);
  52        int (*discard)(struct mtd_blktrans_dev *dev,
  53                       unsigned long block, unsigned nr_blocks);
  54        void (*background)(struct mtd_blktrans_dev *dev);
  55
  56        /* Block layer ioctls */
  57        int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
  58        int (*flush)(struct mtd_blktrans_dev *dev);
  59
  60        /* Called with mtd_table_mutex held; no race with add/remove */
  61        int (*open)(struct mtd_blktrans_dev *dev);
  62        void (*release)(struct mtd_blktrans_dev *dev);
  63
  64        /* Called on {de,}registration and on subsequent addition/removal
  65           of devices, with mtd_table_mutex held. */
  66        void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd);
  67        void (*remove_dev)(struct mtd_blktrans_dev *dev);
  68
  69        struct list_head devs;
  70        struct list_head list;
  71        struct module *owner;
  72};
  73
  74extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
  75extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
  76extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  77extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  78extern int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev);
  79
  80
  81#endif /* __MTD_TRANS_H__ */
  82