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1da177e4 LT |
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 | * | |
182ec4ee | 8 | * For licensing information, see the file 'LICENCE' in the |
1da177e4 LT |
9 | * jffs2 directory. |
10 | * | |
2bc9764c | 11 | * $Id: jffs2.h,v 1.38 2005/09/26 11:37:23 havasi Exp $ |
1da177e4 LT |
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 | ||
e631ddba FH |
31 | /* Summary node MAGIC marker */ |
32 | #define JFFS2_SUM_MAGIC 0x02851885 | |
33 | ||
1da177e4 LT |
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 | |
1da177e4 LT |
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 | ||
e631ddba FH |
66 | #define JFFS2_NODETYPE_SUMMARY (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 6) |
67 | ||
1da177e4 LT |
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 | ||
182ec4ee TG |
73 | #define JFFS2_INO_FLAG_PREREAD 1 /* Do read_inode() for this one at |
74 | mount time, don't wait for it to | |
1da177e4 | 75 | happen later */ |
182ec4ee | 76 | #define JFFS2_INO_FLAG_USERCOMPR 2 /* User has requested a specific |
1da177e4 LT |
77 | compression type */ |
78 | ||
79 | ||
80 | /* These can go once we've made sure we've caught all uses without | |
81 | byteswapping */ | |
82 | ||
83 | typedef struct { | |
84 | uint32_t v32; | |
85 | } __attribute__((packed)) jint32_t; | |
86 | ||
87 | typedef struct { | |
88 | uint32_t m; | |
89 | } __attribute__((packed)) jmode_t; | |
90 | ||
91 | typedef struct { | |
92 | uint16_t v16; | |
93 | } __attribute__((packed)) jint16_t; | |
94 | ||
95 | struct 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 | ||
104 | struct jffs2_raw_dirent | |
105 | { | |
106 | jint16_t magic; | |
f302cd02 | 107 | jint16_t nodetype; /* == JFFS2_NODETYPE_DIRENT */ |
1da177e4 LT |
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. */ | |
182ec4ee | 123 | /* The uid, gid, atime, mtime and ctime members could be longer, but |
1da177e4 LT |
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 | */ | |
128 | struct jffs2_raw_inode | |
129 | { | |
130 | jint16_t magic; /* A constant magic number. */ | |
f302cd02 | 131 | jint16_t nodetype; /* == JFFS2_NODETYPE_INODE */ |
1da177e4 LT |
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 | ||
2bc9764c FH |
154 | struct jffs2_raw_summary |
155 | { | |
e631ddba | 156 | jint16_t magic; |
2bc9764c | 157 | jint16_t nodetype; /* = JFFS2_NODETYPE_SUMMARY */ |
e631ddba FH |
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 | ||
182ec4ee | 168 | union jffs2_node_union |
2bc9764c | 169 | { |
1da177e4 LT |
170 | struct jffs2_raw_inode i; |
171 | struct jffs2_raw_dirent d; | |
2bc9764c | 172 | struct jffs2_raw_summary s; |
1da177e4 LT |
173 | struct jffs2_unknown_node u; |
174 | }; | |
175 | ||
176 | #endif /* __LINUX_JFFS2_H__ */ |