/*

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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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// Maybe later...

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//#define JFFS2_NODETYPE_CHECKPOINT (JFFS2_FEATURE_RWCOMPAT_DELETE | JFFS2_NODE_ACCURATE | 3)

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//#define JFFS2_NODETYPE_OPTIONS (JFFS2_FEATURE_RWCOMPAT_COPY | JFFS2_NODE_ACCURATE | 4)

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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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