2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright (C) 2001 Red Hat, Inc.
6 * Created by David Woodhouse <dwmw2@cambridge.redhat.com>
8 * The original JFFS, from which the design for JFFS2 was derived,
9 * was designed and implemented by Axis Communications AB.
11 * The contents of this file are subject to the Red Hat eCos Public
12 * License Version 1.1 (the "Licence"); you may not use this file
13 * except in compliance with the Licence. You may obtain a copy of
14 * the Licence at http://www.redhat.com/
16 * Software distributed under the Licence is distributed on an "AS IS"
17 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
18 * See the Licence for the specific language governing rights and
19 * limitations under the Licence.
21 * The Original Code is JFFS2 - Journalling Flash File System, version 2
23 * Alternatively, the contents of this file may be used under the
24 * terms of the GNU General Public License version 2 (the "GPL"), in
25 * which case the provisions of the GPL are applicable instead of the
26 * above. If you wish to allow the use of your version of this file
27 * only under the terms of the GPL and not to allow others to use your
28 * version of this file under the RHEPL, indicate your decision by
29 * deleting the provisions above and replace them with the notice and
30 * other provisions required by the GPL. If you do not delete the
31 * provisions above, a recipient may use your version of this file
32 * under either the RHEPL or the GPL.
34 * $Id: jffs2.h,v 1.2 2002/01/17 00:53:20 nyet Exp $
38 #ifndef __LINUX_JFFS2_H__
39 #define __LINUX_JFFS2_H__
41 #include <asm/types.h>
42 #include <jffs2/load_kernel.h>
44 #define JFFS2_SUPER_MAGIC 0x72b6
46 /* Values we may expect to find in the 'magic' field */
47 #define JFFS2_OLD_MAGIC_BITMASK 0x1984
48 #define JFFS2_MAGIC_BITMASK 0x1985
49 #define KSAMTIB_CIGAM_2SFFJ 0x5981 /* For detecting wrong-endian fs */
50 #define JFFS2_EMPTY_BITMASK 0xffff
51 #define JFFS2_DIRTY_BITMASK 0x0000
53 /* We only allow a single char for length, and 0xFF is empty flash so
54 we don't want it confused with a real length. Hence max 254.
56 #define JFFS2_MAX_NAME_LEN 254
58 /* How small can we sensibly write nodes? */
59 #define JFFS2_MIN_DATA_LEN 128
61 #define JFFS2_COMPR_NONE 0x00
62 #define JFFS2_COMPR_ZERO 0x01
63 #define JFFS2_COMPR_RTIME 0x02
64 #define JFFS2_COMPR_RUBINMIPS 0x03
65 #define JFFS2_COMPR_COPY 0x04
66 #define JFFS2_COMPR_DYNRUBIN 0x05
67 #define JFFS2_COMPR_ZLIB 0x06
68 #define JFFS2_COMPR_LZO 0x07
69 #define JFFS2_COMPR_LZARI 0x08
70 #define JFFS2_NUM_COMPR 9
72 /* Compatibility flags. */
73 #define JFFS2_COMPAT_MASK 0xc000 /* What do to if an unknown nodetype is found */
74 #define JFFS2_NODE_ACCURATE 0x2000
75 /* INCOMPAT: Fail to mount the filesystem */
76 #define JFFS2_FEATURE_INCOMPAT 0xc000
77 /* ROCOMPAT: Mount read-only */
78 #define JFFS2_FEATURE_ROCOMPAT 0x8000
79 /* RWCOMPAT_COPY: Mount read/write, and copy the node when it's GC'd */
80 #define JFFS2_FEATURE_RWCOMPAT_COPY 0x4000
81 /* RWCOMPAT_DELETE: Mount read/write, and delete the node when it's GC'd */
82 #define JFFS2_FEATURE_RWCOMPAT_DELETE 0x0000
84 #define JFFS2_NODETYPE_DIRENT (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 1)
85 #define JFFS2_NODETYPE_INODE (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 2)
86 #define JFFS2_NODETYPE_CLEANMARKER (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3)
87 #define JFFS2_NODETYPE_PADDING (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 4)
90 /*#define JFFS2_NODETYPE_CHECKPOINT (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3) */
91 /*#define JFFS2_NODETYPE_OPTIONS (JFFS2_FEATURE_RWCOMPAT_COPY | JFFS2_NODE_ACCURATE | 4) */
93 /* Same as the non_ECC versions, but with extra space for real
94 * ECC instead of just the checksum. For use on NAND flash
96 /*#define JFFS2_NODETYPE_DIRENT_ECC (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 5) */
97 /*#define JFFS2_NODETYPE_INODE_ECC (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 6) */
99 #define JFFS2_INO_FLAG_PREREAD 1 /* Do read_inode() for this one at
100 mount time, don't wait for it to
102 #define JFFS2_INO_FLAG_USERCOMPR 2 /* User has requested a specific
106 struct jffs2_unknown_node
108 /* All start like this */
111 __u32 totlen; /* So we can skip over nodes we don't grok */
113 } __attribute__((packed));
115 struct jffs2_raw_dirent
118 __u16 nodetype; /* == JFFS_NODETYPE_DIRENT */
123 __u32 ino; /* == zero for unlink */
131 } __attribute__((packed));
133 /* The JFFS2 raw inode structure: Used for storage on physical media. */
134 /* The uid, gid, atime, mtime and ctime members could be longer, but
135 are left like this for space efficiency. If and when people decide
136 they really need them extended, it's simple enough to add support for
137 a new type of raw node.
139 struct jffs2_raw_inode
141 __u16 magic; /* A constant magic number. */
142 __u16 nodetype; /* == JFFS_NODETYPE_INODE */
143 __u32 totlen; /* Total length of this node (inc data, etc.) */
145 __u32 ino; /* Inode number. */
146 __u32 version; /* Version number. */
147 __u32 mode; /* The file's type or mode. */
148 __u16 uid; /* The file's owner. */
149 __u16 gid; /* The file's group. */
150 __u32 isize; /* Total resultant size of this inode (used for truncations) */
151 __u32 atime; /* Last access time. */
152 __u32 mtime; /* Last modification time. */
153 __u32 ctime; /* Change time. */
154 __u32 offset; /* Where to begin to write. */
155 __u32 csize; /* (Compressed) data size */
156 __u32 dsize; /* Size of the node's data. (after decompression) */
157 __u8 compr; /* Compression algorithm used */
158 __u8 usercompr; /* Compression algorithm requested by the user */
159 __u16 flags; /* See JFFS2_INO_FLAG_* */
160 __u32 data_crc; /* CRC for the (compressed) data. */
161 __u32 node_crc; /* CRC for the raw inode (excluding data) */
162 /* __u8 data[dsize]; */
163 } __attribute__((packed));
165 union jffs2_node_union {
166 struct jffs2_raw_inode i;
167 struct jffs2_raw_dirent d;
168 struct jffs2_unknown_node u;
169 } __attribute__((packed));
174 # define DT_UNKNOWN DT_UNKNOWN
176 # define DT_FIFO DT_FIFO
178 # define DT_CHR DT_CHR
180 # define DT_DIR DT_DIR
182 # define DT_BLK DT_BLK
184 # define DT_REG DT_REG
186 # define DT_LNK DT_LNK
188 # define DT_SOCK DT_SOCK
190 # define DT_WHT DT_WHT
194 u32 jffs2_1pass_ls(struct part_info *part,const char *fname);
195 u32 jffs2_1pass_load(char *dest, struct part_info *part,const char *fname);
196 u32 jffs2_1pass_info(struct part_info *part);
198 void rtime_decompress(unsigned char *data_in, unsigned char *cpage_out,
199 u32 srclen, u32 destlen);
200 void rubin_do_decompress(unsigned char *bits, unsigned char *in,
201 unsigned char *page_out, __u32 destlen);
202 void dynrubin_decompress(unsigned char *data_in, unsigned char *cpage_out,
203 unsigned long sourcelen, unsigned long dstlen);
204 long zlib_decompress(unsigned char *data_in, unsigned char *cpage_out,
205 __u32 srclen, __u32 destlen);
206 #if defined(CONFIG_JFFS2_LZARI)
207 int lzari_decompress(unsigned char *data_in, unsigned char *cpage_out,
208 u32 srclen, u32 destlen);
210 #if defined(CONFIG_JFFS2_LZO)
211 int lzo_decompress(unsigned char *data_in, unsigned char *cpage_out,
212 u32 srclen, u32 destlen);
215 char *mkmodestr(unsigned long mode, char *str);
216 #endif /* __LINUX_JFFS2_H__ */