224 lines
6.9 KiB
C
224 lines
6.9 KiB
C
/*
|
|
* JFFS2 -- Journalling Flash File System, Version 2.
|
|
*
|
|
* Copyright © 2001-2007 Red Hat, Inc.
|
|
* Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
|
|
*
|
|
* Created by David Woodhouse <dwmw2@infradead.org>
|
|
*
|
|
* For licensing information, see the file 'LICENCE' in the
|
|
* jffs2 directory.
|
|
*/
|
|
|
|
#ifndef __LINUX_JFFS2_H__
|
|
#define __LINUX_JFFS2_H__
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/magic.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. */
|
|
|
|
/* 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
|
|
#define JFFS2_COMPR_LZO 0x07
|
|
/* 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)
|
|
|
|
#define JFFS2_NODETYPE_XATTR (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 8)
|
|
#define JFFS2_NODETYPE_XREF (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 9)
|
|
|
|
/* XATTR Related */
|
|
#define JFFS2_XPREFIX_USER 1 /* for "user." */
|
|
#define JFFS2_XPREFIX_SECURITY 2 /* for "security." */
|
|
#define JFFS2_XPREFIX_ACL_ACCESS 3 /* for "system.posix_acl_access" */
|
|
#define JFFS2_XPREFIX_ACL_DEFAULT 4 /* for "system.posix_acl_default" */
|
|
#define JFFS2_XPREFIX_TRUSTED 5 /* for "trusted.*" */
|
|
|
|
#define JFFS2_ACL_VERSION 0x0001
|
|
|
|
// 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 {
|
|
__u32 v32;
|
|
} __attribute__((packed)) jint32_t;
|
|
|
|
typedef struct {
|
|
__u32 m;
|
|
} __attribute__((packed)) jmode_t;
|
|
|
|
typedef struct {
|
|
__u16 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;
|
|
__u8 nsize;
|
|
__u8 type;
|
|
__u8 unused[2];
|
|
jint32_t node_crc;
|
|
jint32_t name_crc;
|
|
__u8 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) */
|
|
__u8 compr; /* Compression algorithm used */
|
|
__u8 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) */
|
|
__u8 data[0];
|
|
};
|
|
|
|
struct jffs2_raw_xattr {
|
|
jint16_t magic;
|
|
jint16_t nodetype; /* = JFFS2_NODETYPE_XATTR */
|
|
jint32_t totlen;
|
|
jint32_t hdr_crc;
|
|
jint32_t xid; /* XATTR identifier number */
|
|
jint32_t version;
|
|
__u8 xprefix;
|
|
__u8 name_len;
|
|
jint16_t value_len;
|
|
jint32_t data_crc;
|
|
jint32_t node_crc;
|
|
__u8 data[0];
|
|
} __attribute__((packed));
|
|
|
|
struct jffs2_raw_xref
|
|
{
|
|
jint16_t magic;
|
|
jint16_t nodetype; /* = JFFS2_NODETYPE_XREF */
|
|
jint32_t totlen;
|
|
jint32_t hdr_crc;
|
|
jint32_t ino; /* inode number */
|
|
jint32_t xid; /* XATTR identifier number */
|
|
jint32_t xseqno; /* xref sequential number */
|
|
jint32_t node_crc;
|
|
} __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 */
|
|
};
|
|
|
|
union jffs2_node_union
|
|
{
|
|
struct jffs2_raw_inode i;
|
|
struct jffs2_raw_dirent d;
|
|
struct jffs2_raw_xattr x;
|
|
struct jffs2_raw_xref r;
|
|
struct jffs2_raw_summary s;
|
|
struct jffs2_unknown_node u;
|
|
};
|
|
|
|
/* Data payload for device nodes. */
|
|
union jffs2_device_node {
|
|
jint16_t old_id;
|
|
jint32_t new_id;
|
|
};
|
|
|
|
#endif /* __LINUX_JFFS2_H__ */
|