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 * 8 * For licensing information, see the file 'LICENCE' in the 9 * jffs2 directory. 10 * 11 * $Id: jffs2.h,v 1.38 2005/09/26 11:37:23 havasi Exp $ 12 * 13 */ 14 15 #ifndef __LINUX_JFFS2_H__ 16 #define __LINUX_JFFS2_H__ 17 18 #include <linux/magic.h> 19 20 /* You must include something which defines the C99 uintXX_t types. 21 We don't do it from here because this file is used in too many 22 different environments. */ 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 31 /* Summary node MAGIC marker */ 32 #define JFFS2_SUM_MAGIC 0x02851885 33 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 49 #define JFFS2_COMPR_LZO 0x07 50 /* Compatibility flags. */ 51 #define JFFS2_COMPAT_MASK 0xc000 /* What do to if an unknown nodetype is found */ 52 #define JFFS2_NODE_ACCURATE 0x2000 53 /* INCOMPAT: Fail to mount the filesystem */ 54 #define JFFS2_FEATURE_INCOMPAT 0xc000 55 /* ROCOMPAT: Mount read-only */ 56 #define JFFS2_FEATURE_ROCOMPAT 0x8000 57 /* RWCOMPAT_COPY: Mount read/write, and copy the node when it's GC'd */ 58 #define JFFS2_FEATURE_RWCOMPAT_COPY 0x4000 59 /* RWCOMPAT_DELETE: Mount read/write, and delete the node when it's GC'd */ 60 #define JFFS2_FEATURE_RWCOMPAT_DELETE 0x0000 61 62 #define JFFS2_NODETYPE_DIRENT (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 1) 63 #define JFFS2_NODETYPE_INODE (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 2) 64 #define JFFS2_NODETYPE_CLEANMARKER (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3) 65 #define JFFS2_NODETYPE_PADDING (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 4) 66 67 #define JFFS2_NODETYPE_SUMMARY (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 6) 68 69 #define JFFS2_NODETYPE_XATTR (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 8) 70 #define JFFS2_NODETYPE_XREF (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 9) 71 72 /* XATTR Related */ 73 #define JFFS2_XPREFIX_USER 1 /* for "user." */ 74 #define JFFS2_XPREFIX_SECURITY 2 /* for "security." */ 75 #define JFFS2_XPREFIX_ACL_ACCESS 3 /* for "system.posix_acl_access" */ 76 #define JFFS2_XPREFIX_ACL_DEFAULT 4 /* for "system.posix_acl_default" */ 77 #define JFFS2_XPREFIX_TRUSTED 5 /* for "trusted.*" */ 78 79 #define JFFS2_ACL_VERSION 0x0001 80 81 // Maybe later... 82 //#define JFFS2_NODETYPE_CHECKPOINT (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3) 83 //#define JFFS2_NODETYPE_OPTIONS (JFFS2_FEATURE_RWCOMPAT_COPY | JFFS2_NODE_ACCURATE | 4) 84 85 86 #define JFFS2_INO_FLAG_PREREAD 1 /* Do read_inode() for this one at 87 mount time, don't wait for it to 88 happen later */ 89 #define JFFS2_INO_FLAG_USERCOMPR 2 /* User has requested a specific 90 compression type */ 91 92 93 /* These can go once we've made sure we've caught all uses without 94 byteswapping */ 95 96 typedef struct { 97 uint32_t v32; 98 } __attribute__((packed)) jint32_t; 99 100 typedef struct { 101 uint32_t m; 102 } __attribute__((packed)) jmode_t; 103 104 typedef struct { 105 uint16_t v16; 106 } __attribute__((packed)) jint16_t; 107 108 struct jffs2_unknown_node 109 { 110 /* All start like this */ 111 jint16_t magic; 112 jint16_t nodetype; 113 jint32_t totlen; /* So we can skip over nodes we don't grok */ 114 jint32_t hdr_crc; 115 }; 116 117 struct jffs2_raw_dirent 118 { 119 jint16_t magic; 120 jint16_t nodetype; /* == JFFS2_NODETYPE_DIRENT */ 121 jint32_t totlen; 122 jint32_t hdr_crc; 123 jint32_t pino; 124 jint32_t version; 125 jint32_t ino; /* == zero for unlink */ 126 jint32_t mctime; 127 uint8_t nsize; 128 uint8_t type; 129 uint8_t unused[2]; 130 jint32_t node_crc; 131 jint32_t name_crc; 132 uint8_t name[0]; 133 }; 134 135 /* The JFFS2 raw inode structure: Used for storage on physical media. */ 136 /* The uid, gid, atime, mtime and ctime members could be longer, but 137 are left like this for space efficiency. If and when people decide 138 they really need them extended, it's simple enough to add support for 139 a new type of raw node. 140 */ 141 struct jffs2_raw_inode 142 { 143 jint16_t magic; /* A constant magic number. */ 144 jint16_t nodetype; /* == JFFS2_NODETYPE_INODE */ 145 jint32_t totlen; /* Total length of this node (inc data, etc.) */ 146 jint32_t hdr_crc; 147 jint32_t ino; /* Inode number. */ 148 jint32_t version; /* Version number. */ 149 jmode_t mode; /* The file's type or mode. */ 150 jint16_t uid; /* The file's owner. */ 151 jint16_t gid; /* The file's group. */ 152 jint32_t isize; /* Total resultant size of this inode (used for truncations) */ 153 jint32_t atime; /* Last access time. */ 154 jint32_t mtime; /* Last modification time. */ 155 jint32_t ctime; /* Change time. */ 156 jint32_t offset; /* Where to begin to write. */ 157 jint32_t csize; /* (Compressed) data size */ 158 jint32_t dsize; /* Size of the node's data. (after decompression) */ 159 uint8_t compr; /* Compression algorithm used */ 160 uint8_t usercompr; /* Compression algorithm requested by the user */ 161 jint16_t flags; /* See JFFS2_INO_FLAG_* */ 162 jint32_t data_crc; /* CRC for the (compressed) data. */ 163 jint32_t node_crc; /* CRC for the raw inode (excluding data) */ 164 uint8_t data[0]; 165 }; 166 167 struct jffs2_raw_xattr { 168 jint16_t magic; 169 jint16_t nodetype; /* = JFFS2_NODETYPE_XATTR */ 170 jint32_t totlen; 171 jint32_t hdr_crc; 172 jint32_t xid; /* XATTR identifier number */ 173 jint32_t version; 174 uint8_t xprefix; 175 uint8_t name_len; 176 jint16_t value_len; 177 jint32_t data_crc; 178 jint32_t node_crc; 179 uint8_t data[0]; 180 } __attribute__((packed)); 181 182 struct jffs2_raw_xref 183 { 184 jint16_t magic; 185 jint16_t nodetype; /* = JFFS2_NODETYPE_XREF */ 186 jint32_t totlen; 187 jint32_t hdr_crc; 188 jint32_t ino; /* inode number */ 189 jint32_t xid; /* XATTR identifier number */ 190 jint32_t xseqno; /* xref sequencial number */ 191 jint32_t node_crc; 192 } __attribute__((packed)); 193 194 struct jffs2_raw_summary 195 { 196 jint16_t magic; 197 jint16_t nodetype; /* = JFFS2_NODETYPE_SUMMARY */ 198 jint32_t totlen; 199 jint32_t hdr_crc; 200 jint32_t sum_num; /* number of sum entries*/ 201 jint32_t cln_mkr; /* clean marker size, 0 = no cleanmarker */ 202 jint32_t padded; /* sum of the size of padding nodes */ 203 jint32_t sum_crc; /* summary information crc */ 204 jint32_t node_crc; /* node crc */ 205 jint32_t sum[0]; /* inode summary info */ 206 }; 207 208 union jffs2_node_union 209 { 210 struct jffs2_raw_inode i; 211 struct jffs2_raw_dirent d; 212 struct jffs2_raw_xattr x; 213 struct jffs2_raw_xref r; 214 struct jffs2_raw_summary s; 215 struct jffs2_unknown_node u; 216 }; 217 218 /* Data payload for device nodes. */ 219 union jffs2_device_node { 220 jint16_t old; 221 jint32_t new; 222 }; 223 224 #endif /* __LINUX_JFFS2_H__ */ 225