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218 lines
6.7 KiB
218 lines
6.7 KiB
/* |
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* JFFS2 -- Journalling Flash File System, Version 2. |
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* |
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* Copyright © 2001-2007 Red Hat, Inc. |
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* Copyright © 2004-2010 David Woodhouse <[email protected]> |
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* |
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* Created by David Woodhouse <[email protected]> |
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* |
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* For licensing information, see the file 'LICENCE' in the |
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* jffs2 directory. |
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*/ |
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#ifndef __LINUX_JFFS2_H__ |
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#define __LINUX_JFFS2_H__ |
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#include <linux/types.h> |
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#include <linux/magic.h> |
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/* You must include something which defines the C99 uintXX_t types. |
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We don't do it from here because this file is used in too many |
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different environments. */ |
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/* Values we may expect to find in the 'magic' field */ |
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#define JFFS2_OLD_MAGIC_BITMASK 0x1984 |
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#define JFFS2_MAGIC_BITMASK 0x1985 |
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#define KSAMTIB_CIGAM_2SFFJ 0x8519 /* For detecting wrong-endian fs */ |
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#define JFFS2_EMPTY_BITMASK 0xffff |
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#define JFFS2_DIRTY_BITMASK 0x0000 |
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/* Summary node MAGIC marker */ |
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#define JFFS2_SUM_MAGIC 0x02851885 |
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/* We only allow a single char for length, and 0xFF is empty flash so |
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we don't want it confused with a real length. Hence max 254. |
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*/ |
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#define JFFS2_MAX_NAME_LEN 254 |
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/* How small can we sensibly write nodes? */ |
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#define JFFS2_MIN_DATA_LEN 128 |
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#define JFFS2_COMPR_NONE 0x00 |
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#define JFFS2_COMPR_ZERO 0x01 |
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#define JFFS2_COMPR_RTIME 0x02 |
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#define JFFS2_COMPR_RUBINMIPS 0x03 |
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#define JFFS2_COMPR_COPY 0x04 |
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#define JFFS2_COMPR_DYNRUBIN 0x05 |
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#define JFFS2_COMPR_ZLIB 0x06 |
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#define JFFS2_COMPR_LZO 0x07 |
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/* Compatibility flags. */ |
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#define JFFS2_COMPAT_MASK 0xc000 /* What do to if an unknown nodetype is found */ |
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#define JFFS2_NODE_ACCURATE 0x2000 |
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/* INCOMPAT: Fail to mount the filesystem */ |
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#define JFFS2_FEATURE_INCOMPAT 0xc000 |
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/* ROCOMPAT: Mount read-only */ |
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#define JFFS2_FEATURE_ROCOMPAT 0x8000 |
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/* RWCOMPAT_COPY: Mount read/write, and copy the node when it's GC'd */ |
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#define JFFS2_FEATURE_RWCOMPAT_COPY 0x4000 |
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/* RWCOMPAT_DELETE: Mount read/write, and delete the node when it's GC'd */ |
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#define JFFS2_FEATURE_RWCOMPAT_DELETE 0x0000 |
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#define JFFS2_NODETYPE_DIRENT (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 1) |
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#define JFFS2_NODETYPE_INODE (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 2) |
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#define JFFS2_NODETYPE_CLEANMARKER (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3) |
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#define JFFS2_NODETYPE_PADDING (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 4) |
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#define JFFS2_NODETYPE_SUMMARY (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 6) |
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#define JFFS2_NODETYPE_XATTR (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 8) |
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#define JFFS2_NODETYPE_XREF (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 9) |
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/* XATTR Related */ |
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#define JFFS2_XPREFIX_USER 1 /* for "user." */ |
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#define JFFS2_XPREFIX_SECURITY 2 /* for "security." */ |
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#define JFFS2_XPREFIX_ACL_ACCESS 3 /* for "system.posix_acl_access" */ |
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#define JFFS2_XPREFIX_ACL_DEFAULT 4 /* for "system.posix_acl_default" */ |
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#define JFFS2_XPREFIX_TRUSTED 5 /* for "trusted.*" */ |
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#define JFFS2_ACL_VERSION 0x0001 |
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#define JFFS2_INO_FLAG_PREREAD 1 /* Do read_inode() for this one at |
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mount time, don't wait for it to |
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happen later */ |
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#define JFFS2_INO_FLAG_USERCOMPR 2 /* User has requested a specific |
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compression type */ |
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/* These can go once we've made sure we've caught all uses without |
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byteswapping */ |
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typedef struct { |
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__u32 v32; |
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} __attribute__((packed)) jint32_t; |
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typedef struct { |
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__u32 m; |
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} __attribute__((packed)) jmode_t; |
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typedef struct { |
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__u16 v16; |
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} __attribute__((packed)) jint16_t; |
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struct jffs2_unknown_node |
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{ |
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/* All start like this */ |
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jint16_t magic; |
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jint16_t nodetype; |
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jint32_t totlen; /* So we can skip over nodes we don't grok */ |
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jint32_t hdr_crc; |
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}; |
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struct jffs2_raw_dirent |
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{ |
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jint16_t magic; |
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jint16_t nodetype; /* == JFFS2_NODETYPE_DIRENT */ |
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jint32_t totlen; |
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jint32_t hdr_crc; |
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jint32_t pino; |
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jint32_t version; |
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jint32_t ino; /* == zero for unlink */ |
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jint32_t mctime; |
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__u8 nsize; |
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__u8 type; |
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__u8 unused[2]; |
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jint32_t node_crc; |
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jint32_t name_crc; |
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__u8 name[0]; |
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}; |
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/* The JFFS2 raw inode structure: Used for storage on physical media. */ |
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/* The uid, gid, atime, mtime and ctime members could be longer, but |
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are left like this for space efficiency. If and when people decide |
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they really need them extended, it's simple enough to add support for |
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a new type of raw node. |
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*/ |
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struct jffs2_raw_inode |
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{ |
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jint16_t magic; /* A constant magic number. */ |
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jint16_t nodetype; /* == JFFS2_NODETYPE_INODE */ |
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jint32_t totlen; /* Total length of this node (inc data, etc.) */ |
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jint32_t hdr_crc; |
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jint32_t ino; /* Inode number. */ |
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jint32_t version; /* Version number. */ |
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jmode_t mode; /* The file's type or mode. */ |
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jint16_t uid; /* The file's owner. */ |
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jint16_t gid; /* The file's group. */ |
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jint32_t isize; /* Total resultant size of this inode (used for truncations) */ |
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jint32_t atime; /* Last access time. */ |
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jint32_t mtime; /* Last modification time. */ |
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jint32_t ctime; /* Change time. */ |
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jint32_t offset; /* Where to begin to write. */ |
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jint32_t csize; /* (Compressed) data size */ |
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jint32_t dsize; /* Size of the node's data. (after decompression) */ |
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__u8 compr; /* Compression algorithm used */ |
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__u8 usercompr; /* Compression algorithm requested by the user */ |
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jint16_t flags; /* See JFFS2_INO_FLAG_* */ |
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jint32_t data_crc; /* CRC for the (compressed) data. */ |
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jint32_t node_crc; /* CRC for the raw inode (excluding data) */ |
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__u8 data[0]; |
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}; |
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struct jffs2_raw_xattr { |
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jint16_t magic; |
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jint16_t nodetype; /* = JFFS2_NODETYPE_XATTR */ |
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jint32_t totlen; |
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jint32_t hdr_crc; |
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jint32_t xid; /* XATTR identifier number */ |
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jint32_t version; |
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__u8 xprefix; |
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__u8 name_len; |
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jint16_t value_len; |
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jint32_t data_crc; |
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jint32_t node_crc; |
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__u8 data[0]; |
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} __attribute__((packed)); |
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struct jffs2_raw_xref |
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{ |
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jint16_t magic; |
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jint16_t nodetype; /* = JFFS2_NODETYPE_XREF */ |
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jint32_t totlen; |
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jint32_t hdr_crc; |
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jint32_t ino; /* inode number */ |
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jint32_t xid; /* XATTR identifier number */ |
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jint32_t xseqno; /* xref sequential number */ |
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jint32_t node_crc; |
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} __attribute__((packed)); |
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struct jffs2_raw_summary |
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{ |
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jint16_t magic; |
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jint16_t nodetype; /* = JFFS2_NODETYPE_SUMMARY */ |
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jint32_t totlen; |
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jint32_t hdr_crc; |
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jint32_t sum_num; /* number of sum entries*/ |
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jint32_t cln_mkr; /* clean marker size, 0 = no cleanmarker */ |
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jint32_t padded; /* sum of the size of padding nodes */ |
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jint32_t sum_crc; /* summary information crc */ |
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jint32_t node_crc; /* node crc */ |
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jint32_t sum[0]; /* inode summary info */ |
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}; |
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union jffs2_node_union |
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{ |
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struct jffs2_raw_inode i; |
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struct jffs2_raw_dirent d; |
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struct jffs2_raw_xattr x; |
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struct jffs2_raw_xref r; |
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struct jffs2_raw_summary s; |
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struct jffs2_unknown_node u; |
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}; |
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/* Data payload for device nodes. */ |
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union jffs2_device_node { |
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jint16_t old_id; |
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jint32_t new_id; |
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}; |
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#endif /* __LINUX_JFFS2_H__ */
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