| /* |
| * 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; |
| }; |
| |
| 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]; |
| }; |
| |
| /* 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]; |
| }; |
| |
| 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 */ |
| }; |
| |
| union jffs2_node_union |
| { |
| struct jffs2_raw_inode i; |
| struct jffs2_raw_dirent d; |
| struct jffs2_raw_summary s; |
| struct jffs2_unknown_node u; |
| }; |
| |
| /* Data payload for device nodes. */ |
| union jffs2_device_node { |
| jint16_t old; |
| jint32_t new; |
| }; |
| |
| #endif /* __LINUX_JFFS2_H__ */ |