2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright (C) 2001-2003 Red Hat, Inc.
6 * Created by David Woodhouse <dwmw2@infradead.org>
8 * For licensing information, see the file 'LICENCE' in the
12 #ifndef __LINUX_JFFS2_H__
13 #define __LINUX_JFFS2_H__
15 #include <linux/magic.h>
17 /* You must include something which defines the C99 uintXX_t types.
18 We don't do it from here because this file is used in too many
19 different environments. */
21 /* Values we may expect to find in the 'magic' field */
22 #define JFFS2_OLD_MAGIC_BITMASK 0x1984
23 #define JFFS2_MAGIC_BITMASK 0x1985
24 #define KSAMTIB_CIGAM_2SFFJ 0x8519 /* For detecting wrong-endian fs */
25 #define JFFS2_EMPTY_BITMASK 0xffff
26 #define JFFS2_DIRTY_BITMASK 0x0000
28 /* Summary node MAGIC marker */
29 #define JFFS2_SUM_MAGIC 0x02851885
31 /* We only allow a single char for length, and 0xFF is empty flash so
32 we don't want it confused with a real length. Hence max 254.
34 #define JFFS2_MAX_NAME_LEN 254
36 /* How small can we sensibly write nodes? */
37 #define JFFS2_MIN_DATA_LEN 128
39 #define JFFS2_COMPR_NONE 0x00
40 #define JFFS2_COMPR_ZERO 0x01
41 #define JFFS2_COMPR_RTIME 0x02
42 #define JFFS2_COMPR_RUBINMIPS 0x03
43 #define JFFS2_COMPR_COPY 0x04
44 #define JFFS2_COMPR_DYNRUBIN 0x05
45 #define JFFS2_COMPR_ZLIB 0x06
46 #define JFFS2_COMPR_LZO 0x07
47 /* Compatibility flags. */
48 #define JFFS2_COMPAT_MASK 0xc000 /* What do to if an unknown nodetype is found */
49 #define JFFS2_NODE_ACCURATE 0x2000
50 /* INCOMPAT: Fail to mount the filesystem */
51 #define JFFS2_FEATURE_INCOMPAT 0xc000
52 /* ROCOMPAT: Mount read-only */
53 #define JFFS2_FEATURE_ROCOMPAT 0x8000
54 /* RWCOMPAT_COPY: Mount read/write, and copy the node when it's GC'd */
55 #define JFFS2_FEATURE_RWCOMPAT_COPY 0x4000
56 /* RWCOMPAT_DELETE: Mount read/write, and delete the node when it's GC'd */
57 #define JFFS2_FEATURE_RWCOMPAT_DELETE 0x0000
59 #define JFFS2_NODETYPE_DIRENT (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 1)
60 #define JFFS2_NODETYPE_INODE (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 2)
61 #define JFFS2_NODETYPE_CLEANMARKER (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3)
62 #define JFFS2_NODETYPE_PADDING (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 4)
64 #define JFFS2_NODETYPE_SUMMARY (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 6)
66 #define JFFS2_NODETYPE_XATTR (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 8)
67 #define JFFS2_NODETYPE_XREF (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 9)
70 #define JFFS2_XPREFIX_USER 1 /* for "user." */
71 #define JFFS2_XPREFIX_SECURITY 2 /* for "security." */
72 #define JFFS2_XPREFIX_ACL_ACCESS 3 /* for "system.posix_acl_access" */
73 #define JFFS2_XPREFIX_ACL_DEFAULT 4 /* for "system.posix_acl_default" */
74 #define JFFS2_XPREFIX_TRUSTED 5 /* for "trusted.*" */
76 #define JFFS2_ACL_VERSION 0x0001
79 //#define JFFS2_NODETYPE_CHECKPOINT (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3)
80 //#define JFFS2_NODETYPE_OPTIONS (JFFS2_FEATURE_RWCOMPAT_COPY | JFFS2_NODE_ACCURATE | 4)
83 #define JFFS2_INO_FLAG_PREREAD 1 /* Do read_inode() for this one at
84 mount time, don't wait for it to
86 #define JFFS2_INO_FLAG_USERCOMPR 2 /* User has requested a specific
90 /* These can go once we've made sure we've caught all uses without
95 } __attribute__((packed
)) jint32_t
;
99 } __attribute__((packed
)) jmode_t
;
103 } __attribute__((packed
)) jint16_t
;
105 struct jffs2_unknown_node
107 /* All start like this */
110 jint32_t totlen
; /* So we can skip over nodes we don't grok */
114 struct jffs2_raw_dirent
117 jint16_t nodetype
; /* == JFFS2_NODETYPE_DIRENT */
122 jint32_t ino
; /* == zero for unlink */
132 /* The JFFS2 raw inode structure: Used for storage on physical media. */
133 /* The uid, gid, atime, mtime and ctime members could be longer, but
134 are left like this for space efficiency. If and when people decide
135 they really need them extended, it's simple enough to add support for
136 a new type of raw node.
138 struct jffs2_raw_inode
140 jint16_t magic
; /* A constant magic number. */
141 jint16_t nodetype
; /* == JFFS2_NODETYPE_INODE */
142 jint32_t totlen
; /* Total length of this node (inc data, etc.) */
144 jint32_t ino
; /* Inode number. */
145 jint32_t version
; /* Version number. */
146 jmode_t mode
; /* The file's type or mode. */
147 jint16_t uid
; /* The file's owner. */
148 jint16_t gid
; /* The file's group. */
149 jint32_t isize
; /* Total resultant size of this inode (used for truncations) */
150 jint32_t atime
; /* Last access time. */
151 jint32_t mtime
; /* Last modification time. */
152 jint32_t ctime
; /* Change time. */
153 jint32_t offset
; /* Where to begin to write. */
154 jint32_t csize
; /* (Compressed) data size */
155 jint32_t dsize
; /* Size of the node's data. (after decompression) */
156 uint8_t compr
; /* Compression algorithm used */
157 uint8_t usercompr
; /* Compression algorithm requested by the user */
158 jint16_t flags
; /* See JFFS2_INO_FLAG_* */
159 jint32_t data_crc
; /* CRC for the (compressed) data. */
160 jint32_t node_crc
; /* CRC for the raw inode (excluding data) */
164 struct jffs2_raw_xattr
{
166 jint16_t nodetype
; /* = JFFS2_NODETYPE_XATTR */
169 jint32_t xid
; /* XATTR identifier number */
177 } __attribute__((packed
));
179 struct jffs2_raw_xref
182 jint16_t nodetype
; /* = JFFS2_NODETYPE_XREF */
185 jint32_t ino
; /* inode number */
186 jint32_t xid
; /* XATTR identifier number */
187 jint32_t xseqno
; /* xref sequencial number */
189 } __attribute__((packed
));
191 struct jffs2_raw_summary
194 jint16_t nodetype
; /* = JFFS2_NODETYPE_SUMMARY */
197 jint32_t sum_num
; /* number of sum entries*/
198 jint32_t cln_mkr
; /* clean marker size, 0 = no cleanmarker */
199 jint32_t padded
; /* sum of the size of padding nodes */
200 jint32_t sum_crc
; /* summary information crc */
201 jint32_t node_crc
; /* node crc */
202 jint32_t sum
[0]; /* inode summary info */
205 union jffs2_node_union
207 struct jffs2_raw_inode i
;
208 struct jffs2_raw_dirent d
;
209 struct jffs2_raw_xattr x
;
210 struct jffs2_raw_xref r
;
211 struct jffs2_raw_summary s
;
212 struct jffs2_unknown_node u
;
215 /* Data payload for device nodes. */
216 union jffs2_device_node
{
221 #endif /* __LINUX_JFFS2_H__ */
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