1 /* 2 * Copyright © 2003-2010 David Woodhouse <[email protected]> 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 * 18 */ 19 20 #ifndef __MTD_TRANS_H__ 21 #define __MTD_TRANS_H__ 22 23 #include <linux/mutex.h> 24 #include <linux/kref.h> 25 #include <linux/sysfs.h> 26 27 struct hd_geometry; 28 struct mtd_info; 29 struct mtd_blktrans_ops; 30 struct file; 31 struct inode; 32 33 struct mtd_blktrans_dev { 34 struct mtd_blktrans_ops *tr; 35 struct list_head list; 36 struct mtd_info *mtd; 37 struct mutex lock; 38 int devnum; 39 bool bg_stop; 40 unsigned long size; 41 int readonly; 42 int open; 43 struct kref ref; 44 struct gendisk *disk; 45 struct attribute_group *disk_attributes; 46 struct request_queue *rq; 47 struct list_head rq_list; 48 struct blk_mq_tag_set *tag_set; 49 spinlock_t queue_lock; 50 void *priv; 51 fmode_t file_mode; 52 }; 53 54 struct mtd_blktrans_ops { 55 char *name; 56 int major; 57 int part_bits; 58 int blksize; 59 int blkshift; 60 61 /* Access functions */ 62 int (*readsect)(struct mtd_blktrans_dev *dev, 63 unsigned long block, char *buffer); 64 int (*writesect)(struct mtd_blktrans_dev *dev, 65 unsigned long block, char *buffer); 66 int (*discard)(struct mtd_blktrans_dev *dev, 67 unsigned long block, unsigned nr_blocks); 68 void (*background)(struct mtd_blktrans_dev *dev); 69 70 /* Block layer ioctls */ 71 int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo); 72 int (*flush)(struct mtd_blktrans_dev *dev); 73 74 /* Called with mtd_table_mutex held; no race with add/remove */ 75 int (*open)(struct mtd_blktrans_dev *dev); 76 void (*release)(struct mtd_blktrans_dev *dev); 77 78 /* Called on {de,}registration and on subsequent addition/removal 79 of devices, with mtd_table_mutex held. */ 80 void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd); 81 void (*remove_dev)(struct mtd_blktrans_dev *dev); 82 83 struct list_head devs; 84 struct list_head list; 85 struct module *owner; 86 }; 87 88 extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr); 89 extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr); 90 extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev); 91 extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev); 92 extern int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev); 93 94 95 #endif /* __MTD_TRANS_H__ */ 96