219 lines
6.7 KiB
C
219 lines
6.7 KiB
C
/*
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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 <dwmw2@infradead.org>
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*
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* Created by David Woodhouse <dwmw2@infradead.org>
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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[];
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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[];
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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[];
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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[]; /* 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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