1 /* 2 * Copyright © 2003-2010 David Woodhouse <dwmw2@infradead.org> 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 #include <linux/workqueue.h> 27 28 struct hd_geometry; 29 struct mtd_info; 30 struct mtd_blktrans_ops; 31 struct file; 32 struct inode; 33 34 struct mtd_blktrans_dev { 35 struct mtd_blktrans_ops *tr; 36 struct list_head list; 37 struct mtd_info *mtd; 38 struct mutex lock; 39 int devnum; 40 bool bg_stop; 41 unsigned long size; 42 int readonly; 43 int open; 44 struct kref ref; 45 struct gendisk *disk; 46 struct attribute_group *disk_attributes; 47 struct workqueue_struct *wq; 48 struct work_struct work; 49 struct request_queue *rq; 50 spinlock_t queue_lock; 51 void *priv; 52 fmode_t file_mode; 53 }; 54 55 struct mtd_blktrans_ops { 56 char *name; 57 int major; 58 int part_bits; 59 int blksize; 60 int blkshift; 61 62 /* Access functions */ 63 int (*readsect)(struct mtd_blktrans_dev *dev, 64 unsigned long block, char *buffer); 65 int (*writesect)(struct mtd_blktrans_dev *dev, 66 unsigned long block, char *buffer); 67 int (*discard)(struct mtd_blktrans_dev *dev, 68 unsigned long block, unsigned nr_blocks); 69 void (*background)(struct mtd_blktrans_dev *dev); 70 71 /* Block layer ioctls */ 72 int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo); 73 int (*flush)(struct mtd_blktrans_dev *dev); 74 75 /* Called with mtd_table_mutex held; no race with add/remove */ 76 int (*open)(struct mtd_blktrans_dev *dev); 77 void (*release)(struct mtd_blktrans_dev *dev); 78 79 /* Called on {de,}registration and on subsequent addition/removal 80 of devices, with mtd_table_mutex held. */ 81 void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd); 82 void (*remove_dev)(struct mtd_blktrans_dev *dev); 83 84 struct list_head devs; 85 struct list_head list; 86 struct module *owner; 87 }; 88 89 extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr); 90 extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr); 91 extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev); 92 extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev); 93 extern int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev); 94 95 96 #endif /* __MTD_TRANS_H__ */ 97
