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 task_struct *thread; 47 struct request_queue *rq; 48 spinlock_t queue_lock; 49 void *priv; 50 fmode_t file_mode; 51 }; 52 53 struct mtd_blktrans_ops { 54 char *name; 55 int major; 56 int part_bits; 57 int blksize; 58 int blkshift; 59 60 /* Access functions */ 61 int (*readsect)(struct mtd_blktrans_dev *dev, 62 unsigned long block, char *buffer); 63 int (*writesect)(struct mtd_blktrans_dev *dev, 64 unsigned long block, char *buffer); 65 int (*discard)(struct mtd_blktrans_dev *dev, 66 unsigned long block, unsigned nr_blocks); 67 void (*background)(struct mtd_blktrans_dev *dev); 68 69 /* Block layer ioctls */ 70 int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo); 71 int (*flush)(struct mtd_blktrans_dev *dev); 72 73 /* Called with mtd_table_mutex held; no race with add/remove */ 74 int (*open)(struct mtd_blktrans_dev *dev); 75 int (*release)(struct mtd_blktrans_dev *dev); 76 77 /* Called on {de,}registration and on subsequent addition/removal 78 of devices, with mtd_table_mutex held. */ 79 void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd); 80 void (*remove_dev)(struct mtd_blktrans_dev *dev); 81 82 struct list_head devs; 83 struct list_head list; 84 struct module *owner; 85 }; 86 87 extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr); 88 extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr); 89 extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev); 90 extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev); 91 extern int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev); 92 93 94 #endif /* __MTD_TRANS_H__ */ 95