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Diffstat (limited to 'include/linux/jffs2.h')
| -rw-r--r-- | include/linux/jffs2.h | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/include/linux/jffs2.h b/include/linux/jffs2.h new file mode 100644 index 0000000..cf792bb --- /dev/null +++ b/include/linux/jffs2.h @@ -0,0 +1,176 @@ +/* + * JFFS2 -- Journalling Flash File System, Version 2. + * + * Copyright (C) 2001-2003 Red Hat, Inc. + * + * Created by David Woodhouse <dwmw2@infradead.org> + * + * For licensing information, see the file 'LICENCE' in the + * jffs2 directory. + * + * $Id: jffs2.h,v 1.38 2005/09/26 11:37:23 havasi Exp $ + * + */ + +#ifndef __LINUX_JFFS2_H__ +#define __LINUX_JFFS2_H__ + +/* You must include something which defines the C99 uintXX_t types. + We don't do it from here because this file is used in too many + different environments. */ + +#define JFFS2_SUPER_MAGIC 0x72b6 + +/* Values we may expect to find in the 'magic' field */ +#define JFFS2_OLD_MAGIC_BITMASK 0x1984 +#define JFFS2_MAGIC_BITMASK 0x1985 +#define KSAMTIB_CIGAM_2SFFJ 0x8519 /* For detecting wrong-endian fs */ +#define JFFS2_EMPTY_BITMASK 0xffff +#define JFFS2_DIRTY_BITMASK 0x0000 + +/* Summary node MAGIC marker */ +#define JFFS2_SUM_MAGIC 0x02851885 + +/* We only allow a single char for length, and 0xFF is empty flash so + we don't want it confused with a real length. Hence max 254. +*/ +#define JFFS2_MAX_NAME_LEN 254 + +/* How small can we sensibly write nodes? */ +#define JFFS2_MIN_DATA_LEN 128 + +#define JFFS2_COMPR_NONE 0x00 +#define JFFS2_COMPR_ZERO 0x01 +#define JFFS2_COMPR_RTIME 0x02 +#define JFFS2_COMPR_RUBINMIPS 0x03 +#define JFFS2_COMPR_COPY 0x04 +#define JFFS2_COMPR_DYNRUBIN 0x05 +#define JFFS2_COMPR_ZLIB 0x06 +/* Compatibility flags. */ +#define JFFS2_COMPAT_MASK 0xc000 /* What do to if an unknown nodetype is found */ +#define JFFS2_NODE_ACCURATE 0x2000 +/* INCOMPAT: Fail to mount the filesystem */ +#define JFFS2_FEATURE_INCOMPAT 0xc000 +/* ROCOMPAT: Mount read-only */ +#define JFFS2_FEATURE_ROCOMPAT 0x8000 +/* RWCOMPAT_COPY: Mount read/write, and copy the node when it's GC'd */ +#define JFFS2_FEATURE_RWCOMPAT_COPY 0x4000 +/* RWCOMPAT_DELETE: Mount read/write, and delete the node when it's GC'd */ +#define JFFS2_FEATURE_RWCOMPAT_DELETE 0x0000 + +#define JFFS2_NODETYPE_DIRENT (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 1) +#define JFFS2_NODETYPE_INODE (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 2) +#define JFFS2_NODETYPE_CLEANMARKER (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3) +#define JFFS2_NODETYPE_PADDING (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 4) + +#define JFFS2_NODETYPE_SUMMARY (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 6) + +// Maybe later... +//#define JFFS2_NODETYPE_CHECKPOINT (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3) +//#define JFFS2_NODETYPE_OPTIONS (JFFS2_FEATURE_RWCOMPAT_COPY | JFFS2_NODE_ACCURATE | 4) + + +#define JFFS2_INO_FLAG_PREREAD 1 /* Do read_inode() for this one at + mount time, don't wait for it to + happen later */ +#define JFFS2_INO_FLAG_USERCOMPR 2 /* User has requested a specific + compression type */ + + +/* These can go once we've made sure we've caught all uses without + byteswapping */ + +typedef struct { + uint32_t v32; +} __attribute__((packed)) jint32_t; + +typedef struct { + uint32_t m; +} __attribute__((packed)) jmode_t; + +typedef struct { + uint16_t v16; +} __attribute__((packed)) jint16_t; + +struct jffs2_unknown_node +{ + /* All start like this */ + jint16_t magic; + jint16_t nodetype; + jint32_t totlen; /* So we can skip over nodes we don't grok */ + jint32_t hdr_crc; +} __attribute__((packed)); + +struct jffs2_raw_dirent +{ + jint16_t magic; + jint16_t nodetype; /* == JFFS2_NODETYPE_DIRENT */ + jint32_t totlen; + jint32_t hdr_crc; + jint32_t pino; + jint32_t version; + jint32_t ino; /* == zero for unlink */ + jint32_t mctime; + uint8_t nsize; + uint8_t type; + uint8_t unused[2]; + jint32_t node_crc; + jint32_t name_crc; + uint8_t name[0]; +} __attribute__((packed)); + +/* The JFFS2 raw inode structure: Used for storage on physical media. */ +/* The uid, gid, atime, mtime and ctime members could be longer, but + are left like this for space efficiency. If and when people decide + they really need them extended, it's simple enough to add support for + a new type of raw node. +*/ +struct jffs2_raw_inode +{ + jint16_t magic; /* A constant magic number. */ + jint16_t nodetype; /* == JFFS2_NODETYPE_INODE */ + jint32_t totlen; /* Total length of this node (inc data, etc.) */ + jint32_t hdr_crc; + jint32_t ino; /* Inode number. */ + jint32_t version; /* Version number. */ + jmode_t mode; /* The file's type or mode. */ + jint16_t uid; /* The file's owner. */ + jint16_t gid; /* The file's group. */ + jint32_t isize; /* Total resultant size of this inode (used for truncations) */ + jint32_t atime; /* Last access time. */ + jint32_t mtime; /* Last modification time. */ + jint32_t ctime; /* Change time. */ + jint32_t offset; /* Where to begin to write. */ + jint32_t csize; /* (Compressed) data size */ + jint32_t dsize; /* Size of the node's data. (after decompression) */ + uint8_t compr; /* Compression algorithm used */ + uint8_t usercompr; /* Compression algorithm requested by the user */ + jint16_t flags; /* See JFFS2_INO_FLAG_* */ + jint32_t data_crc; /* CRC for the (compressed) data. */ + jint32_t node_crc; /* CRC for the raw inode (excluding data) */ + uint8_t data[0]; +} __attribute__((packed)); + +struct jffs2_raw_summary +{ + jint16_t magic; + jint16_t nodetype; /* = JFFS2_NODETYPE_SUMMARY */ + jint32_t totlen; + jint32_t hdr_crc; + jint32_t sum_num; /* number of sum entries*/ + jint32_t cln_mkr; /* clean marker size, 0 = no cleanmarker */ + jint32_t padded; /* sum of the size of padding nodes */ + jint32_t sum_crc; /* summary information crc */ + jint32_t node_crc; /* node crc */ + jint32_t sum[0]; /* inode summary info */ +} __attribute__((packed)); + +union jffs2_node_union +{ + struct jffs2_raw_inode i; + struct jffs2_raw_dirent d; + struct jffs2_raw_summary s; + struct jffs2_unknown_node u; +}; + +#endif /* __LINUX_JFFS2_H__ */ |