1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-or-later */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Copyright © 2003-2010 David Woodhouse <dwmw2@infradead.org> 4*4882a593Smuzhiyun */ 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun #ifndef __MTD_TRANS_H__ 7*4882a593Smuzhiyun #define __MTD_TRANS_H__ 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun #include <linux/mutex.h> 10*4882a593Smuzhiyun #include <linux/kref.h> 11*4882a593Smuzhiyun #include <linux/sysfs.h> 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun struct hd_geometry; 14*4882a593Smuzhiyun struct mtd_info; 15*4882a593Smuzhiyun struct mtd_blktrans_ops; 16*4882a593Smuzhiyun struct file; 17*4882a593Smuzhiyun struct inode; 18*4882a593Smuzhiyun 19*4882a593Smuzhiyun struct mtd_blktrans_dev { 20*4882a593Smuzhiyun struct mtd_blktrans_ops *tr; 21*4882a593Smuzhiyun struct list_head list; 22*4882a593Smuzhiyun struct mtd_info *mtd; 23*4882a593Smuzhiyun struct mutex lock; 24*4882a593Smuzhiyun int devnum; 25*4882a593Smuzhiyun bool bg_stop; 26*4882a593Smuzhiyun unsigned long size; 27*4882a593Smuzhiyun int readonly; 28*4882a593Smuzhiyun int open; 29*4882a593Smuzhiyun struct kref ref; 30*4882a593Smuzhiyun struct gendisk *disk; 31*4882a593Smuzhiyun struct attribute_group *disk_attributes; 32*4882a593Smuzhiyun struct request_queue *rq; 33*4882a593Smuzhiyun struct list_head rq_list; 34*4882a593Smuzhiyun struct blk_mq_tag_set *tag_set; 35*4882a593Smuzhiyun spinlock_t queue_lock; 36*4882a593Smuzhiyun void *priv; 37*4882a593Smuzhiyun fmode_t file_mode; 38*4882a593Smuzhiyun }; 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun struct mtd_blktrans_ops { 41*4882a593Smuzhiyun char *name; 42*4882a593Smuzhiyun int major; 43*4882a593Smuzhiyun int part_bits; 44*4882a593Smuzhiyun int blksize; 45*4882a593Smuzhiyun int blkshift; 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun /* Access functions */ 48*4882a593Smuzhiyun int (*readsect)(struct mtd_blktrans_dev *dev, 49*4882a593Smuzhiyun unsigned long block, char *buffer); 50*4882a593Smuzhiyun int (*writesect)(struct mtd_blktrans_dev *dev, 51*4882a593Smuzhiyun unsigned long block, char *buffer); 52*4882a593Smuzhiyun int (*discard)(struct mtd_blktrans_dev *dev, 53*4882a593Smuzhiyun unsigned long block, unsigned nr_blocks); 54*4882a593Smuzhiyun void (*background)(struct mtd_blktrans_dev *dev); 55*4882a593Smuzhiyun 56*4882a593Smuzhiyun /* Block layer ioctls */ 57*4882a593Smuzhiyun int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo); 58*4882a593Smuzhiyun int (*flush)(struct mtd_blktrans_dev *dev); 59*4882a593Smuzhiyun 60*4882a593Smuzhiyun /* Called with mtd_table_mutex held; no race with add/remove */ 61*4882a593Smuzhiyun int (*open)(struct mtd_blktrans_dev *dev); 62*4882a593Smuzhiyun void (*release)(struct mtd_blktrans_dev *dev); 63*4882a593Smuzhiyun 64*4882a593Smuzhiyun /* Called on {de,}registration and on subsequent addition/removal 65*4882a593Smuzhiyun of devices, with mtd_table_mutex held. */ 66*4882a593Smuzhiyun void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd); 67*4882a593Smuzhiyun void (*remove_dev)(struct mtd_blktrans_dev *dev); 68*4882a593Smuzhiyun 69*4882a593Smuzhiyun struct list_head devs; 70*4882a593Smuzhiyun struct list_head list; 71*4882a593Smuzhiyun struct module *owner; 72*4882a593Smuzhiyun }; 73*4882a593Smuzhiyun 74*4882a593Smuzhiyun extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr); 75*4882a593Smuzhiyun extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr); 76*4882a593Smuzhiyun extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev); 77*4882a593Smuzhiyun extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev); 78*4882a593Smuzhiyun extern int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev); 79*4882a593Smuzhiyun 80*4882a593Smuzhiyun 81*4882a593Smuzhiyun #endif /* __MTD_TRANS_H__ */ 82