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Artem B. Bityutskiy801c1352006-06-27 12:22:22 +04001/*
2 * Copyright (c) International Business Machines Corp., 2006
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
12 * the 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 * Author: Artem Bityutskiy (Битюцкий Артём)
19 */
20
21#ifndef __LINUX_UBI_H__
22#define __LINUX_UBI_H__
23
24#include <asm/ioctl.h>
25#include <linux/types.h>
26#include <mtd/ubi-user.h>
27
28/*
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +040029 * enum ubi_open_mode - UBI volume open mode constants.
30 *
31 * UBI_READONLY: read-only mode
32 * UBI_READWRITE: read-write mode
33 * UBI_EXCLUSIVE: exclusive mode
34 */
35enum {
36 UBI_READONLY = 1,
37 UBI_READWRITE,
38 UBI_EXCLUSIVE
39};
40
41/**
42 * struct ubi_volume_info - UBI volume description data structure.
43 * @vol_id: volume ID
44 * @ubi_num: UBI device number this volume belongs to
45 * @size: how many physical eraseblocks are reserved for this volume
46 * @used_bytes: how many bytes of data this volume contains
47 * @used_ebs: how many physical eraseblocks of this volume actually contain any
48 * data
49 * @vol_type: volume type (%UBI_DYNAMIC_VOLUME or %UBI_STATIC_VOLUME)
50 * @corrupted: non-zero if the volume is corrupted (static volumes only)
51 * @upd_marker: non-zero if the volume has update marker set
52 * @alignment: volume alignment
53 * @usable_leb_size: how many bytes are available in logical eraseblocks of
54 * this volume
55 * @name_len: volume name length
56 * @name: volume name
57 * @cdev: UBI volume character device major and minor numbers
58 *
59 * The @corrupted flag is only relevant to static volumes and is always zero
60 * for dynamic ones. This is because UBI does not care about dynamic volume
61 * data protection and only cares about protecting static volume data.
62 *
63 * The @upd_marker flag is set if the volume update operation was interrupted.
64 * Before touching the volume data during the update operation, UBI first sets
65 * the update marker flag for this volume. If the volume update operation was
66 * further interrupted, the update marker indicates this. If the update marker
67 * is set, the contents of the volume is certainly damaged and a new volume
68 * update operation has to be started.
69 *
70 * To put it differently, @corrupted and @upd_marker fields have different
71 * semantics:
72 * o the @corrupted flag means that this static volume is corrupted for some
73 * reasons, but not because an interrupted volume update
74 * o the @upd_marker field means that the volume is damaged because of an
75 * interrupted update operation.
76 *
77 * I.e., the @corrupted flag is never set if the @upd_marker flag is set.
78 *
79 * The @used_bytes and @used_ebs fields are only really needed for static
80 * volumes and contain the number of bytes stored in this static volume and how
81 * many eraseblock this data occupies. In case of dynamic volumes, the
82 * @used_bytes field is equivalent to @size*@usable_leb_size, and the @used_ebs
83 * field is equivalent to @size.
84 *
85 * In general, logical eraseblock size is a property of the UBI device, not
86 * of the UBI volume. Indeed, the logical eraseblock size depends on the
87 * physical eraseblock size and on how much bytes UBI headers consume. But
88 * because of the volume alignment (@alignment), the usable size of logical
89 * eraseblocks if a volume may be less. The following equation is true:
90 * @usable_leb_size = LEB size - (LEB size mod @alignment),
91 * where LEB size is the logical eraseblock size defined by the UBI device.
92 *
93 * The alignment is multiple to the minimal flash input/output unit size or %1
94 * if all the available space is used.
95 *
96 * To put this differently, alignment may be considered is a way to change
97 * volume logical eraseblock sizes.
98 */
99struct ubi_volume_info {
100 int ubi_num;
101 int vol_id;
102 int size;
103 long long used_bytes;
104 int used_ebs;
105 int vol_type;
106 int corrupted;
107 int upd_marker;
108 int alignment;
109 int usable_leb_size;
110 int name_len;
111 const char *name;
112 dev_t cdev;
113};
114
115/**
116 * struct ubi_device_info - UBI device description data structure.
117 * @ubi_num: ubi device number
118 * @leb_size: logical eraseblock size on this UBI device
119 * @min_io_size: minimal I/O unit size
120 * @ro_mode: if this device is in read-only mode
121 * @cdev: UBI character device major and minor numbers
122 *
123 * Note, @leb_size is the logical eraseblock size offered by the UBI device.
124 * Volumes of this UBI device may have smaller logical eraseblock size if their
125 * alignment is not equivalent to %1.
126 */
127struct ubi_device_info {
128 int ubi_num;
129 int leb_size;
130 int min_io_size;
131 int ro_mode;
132 dev_t cdev;
133};
134
135/* UBI descriptor given to users when they open UBI volumes */
136struct ubi_volume_desc;
137
138int ubi_get_device_info(int ubi_num, struct ubi_device_info *di);
139void ubi_get_volume_info(struct ubi_volume_desc *desc,
140 struct ubi_volume_info *vi);
141struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode);
142struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name,
143 int mode);
144void ubi_close_volume(struct ubi_volume_desc *desc);
145int ubi_leb_read(struct ubi_volume_desc *desc, int lnum, char *buf, int offset,
146 int len, int check);
147int ubi_leb_write(struct ubi_volume_desc *desc, int lnum, const void *buf,
148 int offset, int len, int dtype);
149int ubi_leb_change(struct ubi_volume_desc *desc, int lnum, const void *buf,
150 int len, int dtype);
151int ubi_leb_erase(struct ubi_volume_desc *desc, int lnum);
152int ubi_leb_unmap(struct ubi_volume_desc *desc, int lnum);
Artem Bityutskiy393852e2007-12-06 18:47:30 +0200153int ubi_leb_map(struct ubi_volume_desc *desc, int lnum, int dtype);
Artem B. Bityutskiy801c1352006-06-27 12:22:22 +0400154int ubi_is_mapped(struct ubi_volume_desc *desc, int lnum);
155
156/*
157 * This function is the same as the 'ubi_leb_read()' function, but it does not
158 * provide the checking capability.
159 */
160static inline int ubi_read(struct ubi_volume_desc *desc, int lnum, char *buf,
161 int offset, int len)
162{
163 return ubi_leb_read(desc, lnum, buf, offset, len, 0);
164}
165
166/*
167 * This function is the same as the 'ubi_leb_write()' functions, but it does
168 * not have the data type argument.
169 */
170static inline int ubi_write(struct ubi_volume_desc *desc, int lnum,
171 const void *buf, int offset, int len)
172{
173 return ubi_leb_write(desc, lnum, buf, offset, len, UBI_UNKNOWN);
174}
175
176/*
177 * This function is the same as the 'ubi_leb_change()' functions, but it does
178 * not have the data type argument.
179 */
180static inline int ubi_change(struct ubi_volume_desc *desc, int lnum,
181 const void *buf, int len)
182{
183 return ubi_leb_change(desc, lnum, buf, len, UBI_UNKNOWN);
184}
185
186#endif /* !__LINUX_UBI_H__ */