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 (at) infradead.org> 7 * 8 * For licensing information, see the file 'LICENCE' in the 9 * jffs2 directory. 10 */ 11 12 #ifndef __LINUX_JFFS2_H__ 13 #define __LINUX_JFFS2_H__ 14 15 #include <linux/types.h> 16 #include <linux/magic.h> 17 18 /* You must include something which defines the C99 uintXX_t types. 19 We don't do it from here because this file is used in too many 20 different environments. */ 21 22 /* Values we may expect to find in the 'magic' field */ 23 #define JFFS2_OLD_MAGIC_BITMASK 0x1984 24 #define JFFS2_MAGIC_BITMASK 0x1985 25 #define KSAMTIB_CIGAM_2SFFJ 0x8519 /* For detecting wrong-endian fs */ 26 #define JFFS2_EMPTY_BITMASK 0xffff 27 #define JFFS2_DIRTY_BITMASK 0x0000 28 29 /* Summary node MAGIC marker */ 30 #define JFFS2_SUM_MAGIC 0x02851885 31 32 /* We only allow a single char for length, and 0xFF is empty flash so 33 we don't want it confused with a real length. Hence max 254. 34 */ 35 #define JFFS2_MAX_NAME_LEN 254 36 37 /* How small can we sensibly write nodes? */ 38 #define JFFS2_MIN_DATA_LEN 128 39 40 #define JFFS2_COMPR_NONE 0x00 41 #define JFFS2_COMPR_ZERO 0x01 42 #define JFFS2_COMPR_RTIME 0x02 43 #define JFFS2_COMPR_RUBINMIPS 0x03 44 #define JFFS2_COMPR_COPY 0x04 45 #define JFFS2_COMPR_DYNRUBIN 0x05 46 #define JFFS2_COMPR_ZLIB 0x06 47 #define JFFS2_COMPR_LZO 0x07 48 /* Compatibility flags. */ 49 #define JFFS2_COMPAT_MASK 0xc000 /* What do to if an unknown nodetype is found */ 50 #define JFFS2_NODE_ACCURATE 0x2000 51 /* INCOMPAT: Fail to mount the filesystem */ 52 #define JFFS2_FEATURE_INCOMPAT 0xc000 53 /* ROCOMPAT: Mount read-only */ 54 #define JFFS2_FEATURE_ROCOMPAT 0x8000 55 /* RWCOMPAT_COPY: Mount read/write, and copy the node when it's GC'd */ 56 #define JFFS2_FEATURE_RWCOMPAT_COPY 0x4000 57 /* RWCOMPAT_DELETE: Mount read/write, and delete the node when it's GC'd */ 58 #define JFFS2_FEATURE_RWCOMPAT_DELETE 0x0000 59 60 #define JFFS2_NODETYPE_DIRENT (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 1) 61 #define JFFS2_NODETYPE_INODE (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 2) 62 #define JFFS2_NODETYPE_CLEANMARKER (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3) 63 #define JFFS2_NODETYPE_PADDING (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 4) 64 65 #define JFFS2_NODETYPE_SUMMARY (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 6) 66 67 #define JFFS2_NODETYPE_XATTR (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 8) 68 #define JFFS2_NODETYPE_XREF (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 9) 69 70 /* XATTR Related */ 71 #define JFFS2_XPREFIX_USER 1 /* for "user." */ 72 #define JFFS2_XPREFIX_SECURITY 2 /* for "security." */ 73 #define JFFS2_XPREFIX_ACL_ACCESS 3 /* for "system.posix_acl_access" */ 74 #define JFFS2_XPREFIX_ACL_DEFAULT 4 /* for "system.posix_acl_default" */ 75 #define JFFS2_XPREFIX_TRUSTED 5 /* for "trusted.*" */ 76 77 #define JFFS2_ACL_VERSION 0x0001 78 79 // Maybe later... 80 //#define JFFS2_NODETYPE_CHECKPOINT (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3) 81 //#define JFFS2_NODETYPE_OPTIONS (JFFS2_FEATURE_RWCOMPAT_COPY | JFFS2_NODE_ACCURATE | 4) 82 83 84 #define JFFS2_INO_FLAG_PREREAD 1 /* Do read_inode() for this one at 85 mount time, don't wait for it to 86 happen later */ 87 #define JFFS2_INO_FLAG_USERCOMPR 2 /* User has requested a specific 88 compression type */ 89 90 91 /* These can go once we've made sure we've caught all uses without 92 byteswapping */ 93 94 typedef struct { 95 __u32 v32; 96 } __attribute__((packed)) jint32_t; 97 98 typedef struct { 99 __u32 m; 100 } __attribute__((packed)) jmode_t; 101 102 typedef struct { 103 __u16 v16; 104 } __attribute__((packed)) jint16_t; 105 106 struct jffs2_unknown_node 107 { 108 /* All start like this */ 109 jint16_t magic; 110 jint16_t nodetype; 111 jint32_t totlen; /* So we can skip over nodes we don't grok */ 112 jint32_t hdr_crc; 113 }; 114 115 struct jffs2_raw_dirent 116 { 117 jint16_t magic; 118 jint16_t nodetype; /* == JFFS2_NODETYPE_DIRENT */ 119 jint32_t totlen; 120 jint32_t hdr_crc; 121 jint32_t pino; 122 jint32_t version; 123 jint32_t ino; /* == zero for unlink */ 124 jint32_t mctime; 125 __u8 nsize; 126 __u8 type; 127 __u8 unused[2]; 128 jint32_t node_crc; 129 jint32_t name_crc; 130 __u8 name[0]; 131 }; 132 133 /* 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. 138 */ 139 struct jffs2_raw_inode 140 { 141 jint16_t magic; /* A constant magic number. */ 142 jint16_t nodetype; /* == JFFS2_NODETYPE_INODE */ 143 jint32_t totlen; /* Total length of this node (inc data, etc.) */ 144 jint32_t hdr_crc; 145 jint32_t ino; /* Inode number. */ 146 jint32_t version; /* Version number. */ 147 jmode_t mode; /* The file's type or mode. */ 148 jint16_t uid; /* The file's owner. */ 149 jint16_t gid; /* The file's group. */ 150 jint32_t isize; /* Total resultant size of this inode (used for truncations) */ 151 jint32_t atime; /* Last access time. */ 152 jint32_t mtime; /* Last modification time. */ 153 jint32_t ctime; /* Change time. */ 154 jint32_t offset; /* Where to begin to write. */ 155 jint32_t csize; /* (Compressed) data size */ 156 jint32_t 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 jint16_t flags; /* See JFFS2_INO_FLAG_* */ 160 jint32_t data_crc; /* CRC for the (compressed) data. */ 161 jint32_t node_crc; /* CRC for the raw inode (excluding data) */ 162 __u8 data[0]; 163 }; 164 165 struct jffs2_raw_xattr { 166 jint16_t magic; 167 jint16_t nodetype; /* = JFFS2_NODETYPE_XATTR */ 168 jint32_t totlen; 169 jint32_t hdr_crc; 170 jint32_t xid; /* XATTR identifier number */ 171 jint32_t version; 172 __u8 xprefix; 173 __u8 name_len; 174 jint16_t value_len; 175 jint32_t data_crc; 176 jint32_t node_crc; 177 __u8 data[0]; 178 } __attribute__((packed)); 179 180 struct jffs2_raw_xref 181 { 182 jint16_t magic; 183 jint16_t nodetype; /* = JFFS2_NODETYPE_XREF */ 184 jint32_t totlen; 185 jint32_t hdr_crc; 186 jint32_t ino; /* inode number */ 187 jint32_t xid; /* XATTR identifier number */ 188 jint32_t xseqno; /* xref sequencial number */ 189 jint32_t node_crc; 190 } __attribute__((packed)); 191 192 struct jffs2_raw_summary 193 { 194 jint16_t magic; 195 jint16_t nodetype; /* = JFFS2_NODETYPE_SUMMARY */ 196 jint32_t totlen; 197 jint32_t hdr_crc; 198 jint32_t sum_num; /* number of sum entries*/ 199 jint32_t cln_mkr; /* clean marker size, 0 = no cleanmarker */ 200 jint32_t padded; /* sum of the size of padding nodes */ 201 jint32_t sum_crc; /* summary information crc */ 202 jint32_t node_crc; /* node crc */ 203 jint32_t sum[0]; /* inode summary info */ 204 }; 205 206 union jffs2_node_union 207 { 208 struct jffs2_raw_inode i; 209 struct jffs2_raw_dirent d; 210 struct jffs2_raw_xattr x; 211 struct jffs2_raw_xref r; 212 struct jffs2_raw_summary s; 213 struct jffs2_unknown_node u; 214 }; 215 216 /* Data payload for device nodes. */ 217 union jffs2_device_node { 218 jint16_t old; 219 jint32_t new; 220 }; 221 222 #endif /* __LINUX_JFFS2_H__ */ 223
