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TOMOYO Linux Cross Reference
Linux/include/linux/mtd/blktrans.h

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  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 
 13 struct hd_geometry;
 14 struct mtd_info;
 15 struct mtd_blktrans_ops;
 16 struct file;
 17 struct inode;
 18 
 19 struct 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 
 40 struct 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 
 74 extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
 75 extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
 76 extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
 77 extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
 78 extern int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev);
 79 
 80 
 81 #endif /* __MTD_TRANS_H__ */
 82 

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