2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright © 2001-2007 Red Hat, Inc.
5 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
7 * Created by David Woodhouse <dwmw2@infradead.org>
9 * For licensing information, see the file 'LICENCE' in the
13 #ifndef __LINUX_JFFS2_H__
14 #define __LINUX_JFFS2_H__
16 #include <linux/types.h>
17 #include <linux/magic.h>
19 /* You must include something which defines the C99 uintXX_t types.
20 We don't do it from here because this file is used in too many
21 different environments. */
23 /* Values we may expect to find in the 'magic' field */
24 #define JFFS2_OLD_MAGIC_BITMASK 0x1984
25 #define JFFS2_MAGIC_BITMASK 0x1985
26 #define KSAMTIB_CIGAM_2SFFJ 0x8519 /* For detecting wrong-endian fs */
27 #define JFFS2_EMPTY_BITMASK 0xffff
28 #define JFFS2_DIRTY_BITMASK 0x0000
30 /* Summary node MAGIC marker */
31 #define JFFS2_SUM_MAGIC 0x02851885
33 /* We only allow a single char for length, and 0xFF is empty flash so
34 we don't want it confused with a real length. Hence max 254.
36 #define JFFS2_MAX_NAME_LEN 254
38 /* How small can we sensibly write nodes? */
39 #define JFFS2_MIN_DATA_LEN 128
41 #define JFFS2_COMPR_NONE 0x00
42 #define JFFS2_COMPR_ZERO 0x01
43 #define JFFS2_COMPR_RTIME 0x02
44 #define JFFS2_COMPR_RUBINMIPS 0x03
45 #define JFFS2_COMPR_COPY 0x04
46 #define JFFS2_COMPR_DYNRUBIN 0x05
47 #define JFFS2_COMPR_ZLIB 0x06
48 #define JFFS2_COMPR_LZO 0x07
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
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)
66 #define JFFS2_NODETYPE_SUMMARY (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 6)
68 #define JFFS2_NODETYPE_XATTR (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 8)
69 #define JFFS2_NODETYPE_XREF (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 9)
72 #define JFFS2_XPREFIX_USER 1 /* for "user." */
73 #define JFFS2_XPREFIX_SECURITY 2 /* for "security." */
74 #define JFFS2_XPREFIX_ACL_ACCESS 3 /* for "system.posix_acl_access" */
75 #define JFFS2_XPREFIX_ACL_DEFAULT 4 /* for "system.posix_acl_default" */
76 #define JFFS2_XPREFIX_TRUSTED 5 /* for "trusted.*" */
78 #define JFFS2_ACL_VERSION 0x0001
81 //#define JFFS2_NODETYPE_CHECKPOINT (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3)
82 //#define JFFS2_NODETYPE_OPTIONS (JFFS2_FEATURE_RWCOMPAT_COPY | JFFS2_NODE_ACCURATE | 4)
85 #define JFFS2_INO_FLAG_PREREAD 1 /* Do read_inode() for this one at
86 mount time, don't wait for it to
88 #define JFFS2_INO_FLAG_USERCOMPR 2 /* User has requested a specific
92 /* These can go once we've made sure we've caught all uses without
97 } __attribute__((packed
)) jint32_t
;
101 } __attribute__((packed
)) jmode_t
;
105 } __attribute__((packed
)) jint16_t
;
107 struct jffs2_unknown_node
109 /* All start like this */
112 jint32_t totlen
; /* So we can skip over nodes we don't grok */
116 struct jffs2_raw_dirent
119 jint16_t nodetype
; /* == JFFS2_NODETYPE_DIRENT */
124 jint32_t ino
; /* == zero for unlink */
134 /* The JFFS2 raw inode structure: Used for storage on physical media. */
135 /* The uid, gid, atime, mtime and ctime members could be longer, but
136 are left like this for space efficiency. If and when people decide
137 they really need them extended, it's simple enough to add support for
138 a new type of raw node.
140 struct jffs2_raw_inode
142 jint16_t magic
; /* A constant magic number. */
143 jint16_t nodetype
; /* == JFFS2_NODETYPE_INODE */
144 jint32_t totlen
; /* Total length of this node (inc data, etc.) */
146 jint32_t ino
; /* Inode number. */
147 jint32_t version
; /* Version number. */
148 jmode_t mode
; /* The file's type or mode. */
149 jint16_t uid
; /* The file's owner. */
150 jint16_t gid
; /* The file's group. */
151 jint32_t isize
; /* Total resultant size of this inode (used for truncations) */
152 jint32_t atime
; /* Last access time. */
153 jint32_t mtime
; /* Last modification time. */
154 jint32_t ctime
; /* Change time. */
155 jint32_t offset
; /* Where to begin to write. */
156 jint32_t csize
; /* (Compressed) data size */
157 jint32_t dsize
; /* Size of the node's data. (after decompression) */
158 __u8 compr
; /* Compression algorithm used */
159 __u8 usercompr
; /* Compression algorithm requested by the user */
160 jint16_t flags
; /* See JFFS2_INO_FLAG_* */
161 jint32_t data_crc
; /* CRC for the (compressed) data. */
162 jint32_t node_crc
; /* CRC for the raw inode (excluding data) */
166 struct jffs2_raw_xattr
{
168 jint16_t nodetype
; /* = JFFS2_NODETYPE_XATTR */
171 jint32_t xid
; /* XATTR identifier number */
179 } __attribute__((packed
));
181 struct jffs2_raw_xref
184 jint16_t nodetype
; /* = JFFS2_NODETYPE_XREF */
187 jint32_t ino
; /* inode number */
188 jint32_t xid
; /* XATTR identifier number */
189 jint32_t xseqno
; /* xref sequential number */
191 } __attribute__((packed
));
193 struct jffs2_raw_summary
196 jint16_t nodetype
; /* = JFFS2_NODETYPE_SUMMARY */
199 jint32_t sum_num
; /* number of sum entries*/
200 jint32_t cln_mkr
; /* clean marker size, 0 = no cleanmarker */
201 jint32_t padded
; /* sum of the size of padding nodes */
202 jint32_t sum_crc
; /* summary information crc */
203 jint32_t node_crc
; /* node crc */
204 jint32_t sum
[0]; /* inode summary info */
207 union jffs2_node_union
209 struct jffs2_raw_inode i
;
210 struct jffs2_raw_dirent d
;
211 struct jffs2_raw_xattr x
;
212 struct jffs2_raw_xref r
;
213 struct jffs2_raw_summary s
;
214 struct jffs2_unknown_node u
;
217 /* Data payload for device nodes. */
218 union jffs2_device_node
{
223 #endif /* __LINUX_JFFS2_H__ */
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