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 unsigned long size; 40 int readonly; 41 int open; 42 struct kref ref; 43 struct gendisk *disk; 44 struct attribute_group *disk_attributes; 45 struct task_struct *thread; 46 struct request_queue *rq; 47 spinlock_t queue_lock; 48 void *priv; 49 }; 50 51 struct mtd_blktrans_ops { 52 char *name; 53 int major; 54 int part_bits; 55 int blksize; 56 int blkshift; 57 58 /* Access functions */ 59 int (*readsect)(struct mtd_blktrans_dev *dev, 60 unsigned long block, char *buffer); 61 int (*writesect)(struct mtd_blktrans_dev *dev, 62 unsigned long block, char *buffer); 63 int (*discard)(struct mtd_blktrans_dev *dev, 64 unsigned long block, unsigned nr_blocks); 65 66 /* Block layer ioctls */ 67 int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo); 68 int (*flush)(struct mtd_blktrans_dev *dev); 69 70 /* Called with mtd_table_mutex held; no race with add/remove */ 71 int (*open)(struct mtd_blktrans_dev *dev); 72 int (*release)(struct mtd_blktrans_dev *dev); 73 74 /* Called on {de,}registration and on subsequent addition/removal 75 of devices, with mtd_table_mutex held. */ 76 void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd); 77 void (*remove_dev)(struct mtd_blktrans_dev *dev); 78 79 struct list_head devs; 80 struct list_head list; 81 struct module *owner; 82 }; 83 84 extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr); 85 extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr); 86 extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev); 87 extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev); 88 89 90 #endif /* __MTD_TRANS_H__ */ 91