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                <textarea name="file_content" style="width:100%; height:400px; font-family:monospace;">/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2001-2007 Red Hat, Inc.
 * Copyright © 2004-2010 David Woodhouse &lt;dwmw2@infradead.org&gt;
 *
 * Created by David Woodhouse &lt;dwmw2@infradead.org&gt;
 *
 * For licensing information, see the file &#039;LICENCE&#039; in the
 * jffs2 directory.
 */

#ifndef __LINUX_JFFS2_H__
#define __LINUX_JFFS2_H__

#include &lt;linux/types.h&gt;
#include &lt;linux/magic.h&gt;

/* You must include something which defines the C99 uintXX_t types. 
   We don&#039;t do it from here because this file is used in too many
   different environments. */

/* Values we may expect to find in the &#039;magic&#039; 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&#039;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&#039;s GC&#039;d */
#define JFFS2_FEATURE_RWCOMPAT_COPY 0x4000
/* RWCOMPAT_DELETE: Mount read/write, and delete the node when it&#039;s GC&#039;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 &quot;user.&quot; */
#define JFFS2_XPREFIX_SECURITY		2	/* for &quot;security.&quot; */
#define JFFS2_XPREFIX_ACL_ACCESS	3	/* for &quot;system.posix_acl_access&quot; */
#define JFFS2_XPREFIX_ACL_DEFAULT	4	/* for &quot;system.posix_acl_default&quot; */
#define JFFS2_XPREFIX_TRUSTED		5	/* for &quot;trusted.*&quot; */

#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&#039;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&#039;ve made sure we&#039;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&#039;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&#039;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&#039;s type or mode.  */
	jint16_t uid;        /* The file&#039;s owner.  */
	jint16_t gid;        /* The file&#039;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&#039;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__ */
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