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6cfeb41a82
This patch introduces the module_mtd_blktrans macro which is a convenience macro for mtd blktrans modules similar to module_platform_driver. It is intended to be used by drivers which init/exit section does nothing but register/unregister the mtd blktrans driver. By using this macro it is possible to eliminate a few lines of boilerplate code per mtd blktrans driver. Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20210213164600.409061-2-zhengdejin5@gmail.com
92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright © 2003-2010 David Woodhouse <dwmw2@infradead.org>
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*/
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#ifndef __MTD_TRANS_H__
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#define __MTD_TRANS_H__
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#include <linux/mutex.h>
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#include <linux/kref.h>
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#include <linux/sysfs.h>
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struct hd_geometry;
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struct mtd_info;
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struct mtd_blktrans_ops;
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struct file;
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struct inode;
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struct mtd_blktrans_dev {
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struct mtd_blktrans_ops *tr;
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struct list_head list;
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struct mtd_info *mtd;
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struct mutex lock;
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int devnum;
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bool bg_stop;
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unsigned long size;
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int readonly;
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int open;
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struct kref ref;
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struct gendisk *disk;
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struct attribute_group *disk_attributes;
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struct request_queue *rq;
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struct list_head rq_list;
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struct blk_mq_tag_set *tag_set;
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spinlock_t queue_lock;
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void *priv;
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fmode_t file_mode;
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};
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struct mtd_blktrans_ops {
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char *name;
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int major;
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int part_bits;
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int blksize;
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int blkshift;
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/* Access functions */
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int (*readsect)(struct mtd_blktrans_dev *dev,
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unsigned long block, char *buffer);
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int (*writesect)(struct mtd_blktrans_dev *dev,
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unsigned long block, char *buffer);
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int (*discard)(struct mtd_blktrans_dev *dev,
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unsigned long block, unsigned nr_blocks);
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void (*background)(struct mtd_blktrans_dev *dev);
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/* Block layer ioctls */
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int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
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int (*flush)(struct mtd_blktrans_dev *dev);
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/* Called with mtd_table_mutex held; no race with add/remove */
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int (*open)(struct mtd_blktrans_dev *dev);
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void (*release)(struct mtd_blktrans_dev *dev);
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/* Called on {de,}registration and on subsequent addition/removal
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of devices, with mtd_table_mutex held. */
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void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd);
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void (*remove_dev)(struct mtd_blktrans_dev *dev);
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struct list_head devs;
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struct list_head list;
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struct module *owner;
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};
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extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
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extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
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extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
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extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
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extern int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev);
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/**
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* module_mtd_blktrans() - Helper macro for registering a mtd blktrans driver
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* @__mtd_blktrans: mtd_blktrans_ops struct
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*
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* Helper macro for mtd blktrans drivers which do not do anything special in
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* module init/exit. This eliminates a lot of boilerplate. Each module may only
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* use this macro once, and calling it replaces module_init() and module_exit()
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*/
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#define module_mtd_blktrans(__mtd_blktrans) \
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module_driver(__mtd_blktrans, register_mtd_blktrans, \
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deregister_mtd_blktrans)
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#endif /* __MTD_TRANS_H__ */
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