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