1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/*
* JFFS2 -- Journalling Flash File System, Version 2.
*
* Copyright (C) 2001-2003 Red Hat, Inc.
*
* Created by David Woodhouse <dwmw2@infradead.org>
*
* For licensing information, see the file 'LICENCE' in the
* jffs2 directory.
*
* $Id: jffs2.h,v 1.38 2005/09/26 11:37:23 havasi Exp $
*
*/
#ifndef __LINUX_JFFS2_H__
#define __LINUX_JFFS2_H__
/* You must include something which defines the C99 uintXX_t types.
We don't do it from here because this file is used in too many
different environments. */
#define JFFS2_SUPER_MAGIC 0x72b6
/* Values we may expect to find in the 'magic' field */
#define JFFS2_OLD_MAGIC_BITMASK 0x1984
#define JFFS2_MAGIC_BITMASK 0x1985
#define KSAMTIB_CIGAM_2SFFJ 0x8519 /* For detecting wrong-endian fs */
#define JFFS2_EMPTY_BITMASK 0xffff
#define JFFS2_DIRTY_BITMASK 0x0000
/* Summary node MAGIC marker */
#define JFFS2_SUM_MAGIC 0x02851885
/* We only allow a single char for length, and 0xFF is empty flash so
we don't want it confused with a real length. Hence max 254.
*/
#define JFFS2_MAX_NAME_LEN 254
/* How small can we sensibly write nodes? */
#define JFFS2_MIN_DATA_LEN 128
#define JFFS2_COMPR_NONE 0x00
#define JFFS2_COMPR_ZERO 0x01
#define JFFS2_COMPR_RTIME 0x02
#define JFFS2_COMPR_RUBINMIPS 0x03
#define JFFS2_COMPR_COPY 0x04
#define JFFS2_COMPR_DYNRUBIN 0x05
#define JFFS2_COMPR_ZLIB 0x06
/* Compatibility flags. */
#define JFFS2_COMPAT_MASK 0xc000 /* What do to if an unknown nodetype is found */
#define JFFS2_NODE_ACCURATE 0x2000
/* INCOMPAT: Fail to mount the filesystem */
#define JFFS2_FEATURE_INCOMPAT 0xc000
/* ROCOMPAT: Mount read-only */
#define JFFS2_FEATURE_ROCOMPAT 0x8000
/* RWCOMPAT_COPY: Mount read/write, and copy the node when it's GC'd */
#define JFFS2_FEATURE_RWCOMPAT_COPY 0x4000
/* RWCOMPAT_DELETE: Mount read/write, and delete the node when it's GC'd */
#define JFFS2_FEATURE_RWCOMPAT_DELETE 0x0000
#define JFFS2_NODETYPE_DIRENT (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 1)
#define JFFS2_NODETYPE_INODE (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 2)
#define JFFS2_NODETYPE_CLEANMARKER (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3)
#define JFFS2_NODETYPE_PADDING (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 4)
#define JFFS2_NODETYPE_SUMMARY (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 6)
#define JFFS2_NODETYPE_XATTR (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 8)
#define JFFS2_NODETYPE_XREF (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 9)
/* XATTR Related */
#define JFFS2_XPREFIX_USER 1 /* for "user." */
#define JFFS2_XPREFIX_SECURITY 2 /* for "security." */
#define JFFS2_XPREFIX_ACL_ACCESS 3 /* for "system.posix_acl_access" */
#define JFFS2_XPREFIX_ACL_DEFAULT 4 /* for "system.posix_acl_default" */
#define JFFS2_XPREFIX_TRUSTED 5 /* for "trusted.*" */
#define JFFS2_ACL_VERSION 0x0001
// Maybe later...
//#define JFFS2_NODETYPE_CHECKPOINT (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3)
//#define JFFS2_NODETYPE_OPTIONS (JFFS2_FEATURE_RWCOMPAT_COPY | JFFS2_NODE_ACCURATE | 4)
#define JFFS2_INO_FLAG_PREREAD 1 /* Do read_inode() for this one at
mount time, don't wait for it to
happen later */
#define JFFS2_INO_FLAG_USERCOMPR 2 /* User has requested a specific
compression type */
/* These can go once we've made sure we've caught all uses without
byteswapping */
typedef struct {
uint32_t v32;
} __attribute__((packed)) jint32_t;
typedef struct {
uint32_t m;
} __attribute__((packed)) jmode_t;
typedef struct {
uint16_t v16;
} __attribute__((packed)) jint16_t;
struct jffs2_unknown_node
{
/* All start like this */
jint16_t magic;
jint16_t nodetype;
jint32_t totlen; /* So we can skip over nodes we don't grok */
jint32_t hdr_crc;
} __attribute__((packed));
struct jffs2_raw_dirent
{
jint16_t magic;
jint16_t nodetype; /* == JFFS2_NODETYPE_DIRENT */
jint32_t totlen;
jint32_t hdr_crc;
jint32_t pino;
jint32_t version;
jint32_t ino; /* == zero for unlink */
jint32_t mctime;
uint8_t nsize;
uint8_t type;
uint8_t unused[2];
jint32_t node_crc;
jint32_t name_crc;
uint8_t name[0];
} __attribute__((packed));
/* The JFFS2 raw inode structure: Used for storage on physical media. */
/* The uid, gid, atime, mtime and ctime members could be longer, but
are left like this for space efficiency. If and when people decide
they really need them extended, it's simple enough to add support for
a new type of raw node.
*/
struct jffs2_raw_inode
{
jint16_t magic; /* A constant magic number. */
jint16_t nodetype; /* == JFFS2_NODETYPE_INODE */
jint32_t totlen; /* Total length of this node (inc data, etc.) */
jint32_t hdr_crc;
jint32_t ino; /* Inode number. */
jint32_t version; /* Version number. */
jmode_t mode; /* The file's type or mode. */
jint16_t uid; /* The file's owner. */
jint16_t gid; /* The file's group. */
jint32_t isize; /* Total resultant size of this inode (used for truncations) */
jint32_t atime; /* Last access time. */
jint32_t mtime; /* Last modification time. */
jint32_t ctime; /* Change time. */
jint32_t offset; /* Where to begin to write. */
jint32_t csize; /* (Compressed) data size */
jint32_t dsize; /* Size of the node's data. (after decompression) */
uint8_t compr; /* Compression algorithm used */
uint8_t usercompr; /* Compression algorithm requested by the user */
jint16_t flags; /* See JFFS2_INO_FLAG_* */
jint32_t data_crc; /* CRC for the (compressed) data. */
jint32_t node_crc; /* CRC for the raw inode (excluding data) */
uint8_t data[0];
} __attribute__((packed));
struct jffs2_raw_xattr {
jint16_t magic;
jint16_t nodetype; /* = JFFS2_NODETYPE_XATTR */
jint32_t totlen;
jint32_t hdr_crc;
jint32_t xid; /* XATTR identifier number */
jint32_t version;
uint8_t xprefix;
uint8_t name_len;
jint16_t value_len;
jint32_t data_crc;
jint32_t node_crc;
uint8_t data[0];
} __attribute__((packed));
struct jffs2_raw_xref
{
jint16_t magic;
jint16_t nodetype; /* = JFFS2_NODETYPE_XREF */
jint32_t totlen;
jint32_t hdr_crc;
jint32_t ino; /* inode number */
jint32_t xid; /* XATTR identifier number */
jint32_t node_crc;
} __attribute__((packed));
struct jffs2_raw_summary
{
jint16_t magic;
jint16_t nodetype; /* = JFFS2_NODETYPE_SUMMARY */
jint32_t totlen;
jint32_t hdr_crc;
jint32_t sum_num; /* number of sum entries*/
jint32_t cln_mkr; /* clean marker size, 0 = no cleanmarker */
jint32_t padded; /* sum of the size of padding nodes */
jint32_t sum_crc; /* summary information crc */
jint32_t node_crc; /* node crc */
jint32_t sum[0]; /* inode summary info */
} __attribute__((packed));
union jffs2_node_union
{
struct jffs2_raw_inode i;
struct jffs2_raw_dirent d;
struct jffs2_raw_xattr x;
struct jffs2_raw_xref r;
struct jffs2_raw_summary s;
struct jffs2_unknown_node u;
};
#endif /* __LINUX_JFFS2_H__ */
|
