Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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
27struct hd_geometry;
28struct mtd_info;
29struct mtd_blktrans_ops;
30struct file;
31struct inode;
32
33struct 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
54struct 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
88extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
89extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
90extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
91extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
92extern int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev);
93
94
95#endif /* __MTD_TRANS_H__ */