1 files changed, 92 insertions, 0 deletions
diff --git a/include/linux/mtd/blktrans.h b/include/linux/mtd/blktrans.h
new file mode 100644
index 000000000..15cc9b95e
--- /dev/null
+++ b/include/linux/mtd/blktrans.h
@@ -0,0 +1,92 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright © 2003-2010 David Woodhouse <dwmw2@infradead.org>
+ */
+
+#ifndef __MTD_TRANS_H__
+#define __MTD_TRANS_H__
+
+#include <linux/mutex.h>
+#include <linux/kref.h>
+#include <linux/sysfs.h>
+
+struct hd_geometry;
+struct mtd_info;
+struct mtd_blktrans_ops;
+struct file;
+struct inode;
+
+struct mtd_blktrans_dev {
+	struct mtd_blktrans_ops *tr;
+	struct list_head list;
+	struct mtd_info *mtd;
+	struct mutex lock;
+	int devnum;
+	bool bg_stop;
+	unsigned long size;
+	int readonly;
+	int open;
+	struct kref ref;
+	struct gendisk *disk;
+	struct attribute_group *disk_attributes;
+	struct request_queue *rq;
+	struct list_head rq_list;
+	struct blk_mq_tag_set *tag_set;
+	spinlock_t queue_lock;
+	void *priv;
+	fmode_t file_mode;
+};
+
+struct mtd_blktrans_ops {
+	char *name;
+	int major;
+	int part_bits;
+	int blksize;
+	int blkshift;
+
+	/* Access functions */
+	int (*readsect)(struct mtd_blktrans_dev *dev,
+		    unsigned long block, char *buffer);
+	int (*writesect)(struct mtd_blktrans_dev *dev,
+		     unsigned long block, char *buffer);
+	int (*discard)(struct mtd_blktrans_dev *dev,
+		       unsigned long block, unsigned nr_blocks);
+	void (*background)(struct mtd_blktrans_dev *dev);
+
+	/* Block layer ioctls */
+	int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
+	int (*flush)(struct mtd_blktrans_dev *dev);
+
+	/* Called with mtd_table_mutex held; no race with add/remove */
+	int (*open)(struct mtd_blktrans_dev *dev);
+	void (*release)(struct mtd_blktrans_dev *dev);
+
+	/* Called on {de,}registration and on subsequent addition/removal
+	   of devices, with mtd_table_mutex held. */
+	void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd);
+	void (*remove_dev)(struct mtd_blktrans_dev *dev);
+
+	struct list_head devs;
+	struct list_head list;
+	struct module *owner;
+};
+
+extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
+extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
+extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
+extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
+extern int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev);
+
+/**
+ * module_mtd_blktrans() - Helper macro for registering a mtd blktrans driver
+ * @__mtd_blktrans: mtd_blktrans_ops struct
+ *
+ * Helper macro for mtd blktrans drivers which do not do anything special in
+ * module init/exit. This eliminates a lot of boilerplate. Each module may only
+ * use this macro once, and calling it replaces module_init() and module_exit()
+ */
+#define module_mtd_blktrans(__mtd_blktrans) \
+	module_driver(__mtd_blktrans, register_mtd_blktrans, \
+					deregister_mtd_blktrans)
+
+#endif /* __MTD_TRANS_H__ */