LXR uboot/include/jffs2/jffs2.h

   1/*
   2 * JFFS2 -- Journalling Flash File System, Version 2.
   3 *
   4 * Copyright (C) 2001 Red Hat, Inc.
   5 *
   6 * Created by David Woodhouse <dwmw2@cambridge.redhat.com>
   7 *
   8 * The original JFFS, from which the design for JFFS2 was derived,
   9 * was designed and implemented by Axis Communications AB.
  10 *
  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/
  15 *
  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.
  20 *
  21 * The Original Code is JFFS2 - Journalling Flash File System, version 2
  22 *
  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.
  33 *
  34 * $Id: jffs2.h,v 1.2 2002/01/17 00:53:20 nyet Exp $
  35 *
  36 */
  37
  38#ifndef __LINUX_JFFS2_H__
  39#define __LINUX_JFFS2_H__
  40
  41#include <asm/types.h>
  42#include <jffs2/load_kernel.h>
  43
  44#define JFFS2_SUPER_MAGIC 0x72b6
  45
  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
  52
  53/* Summary node MAGIC marker */
  54#define JFFS2_SUM_MAGIC 0x02851885
  55
  56/* We only allow a single char for length, and 0xFF is empty flash so
  57   we don't want it confused with a real length. Hence max 254.
  58*/
  59#define JFFS2_MAX_NAME_LEN 254
  60
  61/* How small can we sensibly write nodes? */
  62#define JFFS2_MIN_DATA_LEN 128
  63
  64#define JFFS2_COMPR_NONE        0x00
  65#define JFFS2_COMPR_ZERO        0x01
  66#define JFFS2_COMPR_RTIME       0x02
  67#define JFFS2_COMPR_RUBINMIPS   0x03
  68#define JFFS2_COMPR_COPY        0x04
  69#define JFFS2_COMPR_DYNRUBIN    0x05
  70#define JFFS2_COMPR_ZLIB        0x06
  71#if defined(CONFIG_JFFS2_LZO)
  72#define JFFS2_COMPR_LZO         0x07
  73#define JFFS2_NUM_COMPR         8
  74#else
  75#define JFFS2_NUM_COMPR         7
  76#endif
  77
  78/* Compatibility flags. */
  79#define JFFS2_COMPAT_MASK 0xc000      /* What do to if an unknown nodetype is found */
  80#define JFFS2_NODE_ACCURATE 0x2000
  81/* INCOMPAT: Fail to mount the filesystem */
  82#define JFFS2_FEATURE_INCOMPAT 0xc000
  83/* ROCOMPAT: Mount read-only */
  84#define JFFS2_FEATURE_ROCOMPAT 0x8000
  85/* RWCOMPAT_COPY: Mount read/write, and copy the node when it's GC'd */
  86#define JFFS2_FEATURE_RWCOMPAT_COPY 0x4000
  87/* RWCOMPAT_DELETE: Mount read/write, and delete the node when it's GC'd */
  88#define JFFS2_FEATURE_RWCOMPAT_DELETE 0x0000
  89
  90#define JFFS2_NODETYPE_DIRENT (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 1)
  91#define JFFS2_NODETYPE_INODE (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 2)
  92#define JFFS2_NODETYPE_CLEANMARKER (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3)
  93#define JFFS2_NODETYPE_PADDING (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 4)
  94#define JFFS2_NODETYPE_SUMMARY (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 6)
  95
  96/* Maybe later... */
  97/*#define JFFS2_NODETYPE_CHECKPOINT (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3) */
  98/*#define JFFS2_NODETYPE_OPTIONS (JFFS2_FEATURE_RWCOMPAT_COPY | JFFS2_NODE_ACCURATE | 4) */
  99
 100/* Same as the non_ECC versions, but with extra space for real
 101 * ECC instead of just the checksum. For use on NAND flash
 102 */
 103/*#define JFFS2_NODETYPE_DIRENT_ECC (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 5) */
 104/*#define JFFS2_NODETYPE_INODE_ECC (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 6) */
 105
 106#define JFFS2_INO_FLAG_PREREAD    1     /* Do read_inode() for this one at
 107                                           mount time, don't wait for it to
 108                                           happen later */
 109#define JFFS2_INO_FLAG_USERCOMPR  2     /* User has requested a specific
 110                                           compression type */
 111
 112
 113struct jffs2_unknown_node
 114{
 115        /* All start like this */
 116        __u16 magic;
 117        __u16 nodetype;
 118        __u32 totlen; /* So we can skip over nodes we don't grok */
 119        __u32 hdr_crc;
 120} __attribute__((packed));
 121
 122struct jffs2_raw_dirent
 123{
 124        __u16 magic;
 125        __u16 nodetype; /* == JFFS_NODETYPE_DIRENT */
 126        __u32 totlen;
 127        __u32 hdr_crc;
 128        __u32 pino;
 129        __u32 version;
 130        __u32 ino; /* == zero for unlink */
 131        __u32 mctime;
 132        __u8 nsize;
 133        __u8 type;
 134        __u8 unused[2];
 135        __u32 node_crc;
 136        __u32 name_crc;
 137        __u8 name[0];
 138} __attribute__((packed));
 139
 140/* The JFFS2 raw inode structure: Used for storage on physical media.  */
 141/* The uid, gid, atime, mtime and ctime members could be longer, but
 142   are left like this for space efficiency. If and when people decide
 143   they really need them extended, it's simple enough to add support for
 144   a new type of raw node.
 145*/
 146struct jffs2_raw_inode
 147{
 148        __u16 magic;      /* A constant magic number.  */
 149        __u16 nodetype;   /* == JFFS_NODETYPE_INODE */
 150        __u32 totlen;     /* Total length of this node (inc data, etc.) */
 151        __u32 hdr_crc;
 152        __u32 ino;        /* Inode number.  */
 153        __u32 version;    /* Version number.  */
 154        __u32 mode;       /* The file's type or mode.  */
 155        __u16 uid;        /* The file's owner.  */
 156        __u16 gid;        /* The file's group.  */
 157        __u32 isize;      /* Total resultant size of this inode (used for truncations)  */
 158        __u32 atime;      /* Last access time.  */
 159        __u32 mtime;      /* Last modification time.  */
 160        __u32 ctime;      /* Change time.  */
 161        __u32 offset;     /* Where to begin to write.  */
 162        __u32 csize;      /* (Compressed) data size */
 163        __u32 dsize;      /* Size of the node's data. (after decompression) */
 164        __u8 compr;       /* Compression algorithm used */
 165        __u8 usercompr;   /* Compression algorithm requested by the user */
 166        __u16 flags;      /* See JFFS2_INO_FLAG_* */
 167        __u32 data_crc;   /* CRC for the (compressed) data.  */
 168        __u32 node_crc;   /* CRC for the raw inode (excluding data)  */
 169/*      __u8 data[dsize]; */
 170} __attribute__((packed));
 171
 172struct jffs2_raw_summary
 173{
 174        __u16 magic;
 175        __u16 nodetype;         /* = JFFS2_NODETYPE_SUMMARY */
 176        __u32 totlen;
 177        __u32 hdr_crc;
 178        __u32 sum_num;  /* number of sum entries*/
 179        __u32 cln_mkr;  /* clean marker size, 0 = no cleanmarker */
 180        __u32 padded;   /* sum of the size of padding nodes */
 181        __u32 sum_crc;  /* summary information crc */
 182        __u32 node_crc;         /* node crc */
 183        __u32 sum[0];   /* inode summary info */
 184};
 185
 186union jffs2_node_union {
 187        struct jffs2_raw_inode i;
 188        struct jffs2_raw_dirent d;
 189        struct jffs2_raw_summary s;
 190        struct jffs2_unknown_node u;
 191} __attribute__((packed));
 192
 193enum
 194  {
 195    DT_UNKNOWN = 0,
 196# define DT_UNKNOWN     DT_UNKNOWN
 197    DT_FIFO = 1,
 198# define DT_FIFO        DT_FIFO
 199    DT_CHR = 2,
 200# define DT_CHR         DT_CHR
 201    DT_DIR = 4,
 202# define DT_DIR         DT_DIR
 203    DT_BLK = 6,
 204# define DT_BLK         DT_BLK
 205    DT_REG = 8,
 206# define DT_REG         DT_REG
 207    DT_LNK = 10,
 208# define DT_LNK         DT_LNK
 209    DT_SOCK = 12,
 210# define DT_SOCK        DT_SOCK
 211    DT_WHT = 14
 212# define DT_WHT         DT_WHT
 213  };
 214
 215
 216u32 jffs2_1pass_ls(struct part_info *part,const char *fname);
 217u32 jffs2_1pass_load(char *dest, struct part_info *part,const char *fname);
 218u32 jffs2_1pass_info(struct part_info *part);
 219
 220void rtime_decompress(unsigned char *data_in, unsigned char *cpage_out,
 221                u32 srclen, u32 destlen);
 222void rubin_do_decompress(unsigned char *bits, unsigned char *in,
 223                unsigned char *page_out, __u32 destlen);
 224void dynrubin_decompress(unsigned char *data_in, unsigned char *cpage_out,
 225                unsigned long sourcelen, unsigned long dstlen);
 226long zlib_decompress(unsigned char *data_in, unsigned char *cpage_out,
 227                __u32 srclen, __u32 destlen);
 228#if defined(CONFIG_JFFS2_LZO)
 229int lzo_decompress(unsigned char *data_in, unsigned char *cpage_out,
 230                u32 srclen, u32 destlen);
 231#endif
 232
 233char *mkmodestr(unsigned long mode, char *str);
 234#endif /* __LINUX_JFFS2_H__ */
 235