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[/] [openrisc/] [trunk/] [rtos/] [ecos-3.0/] [packages/] [fs/] [jffs2/] [current/] [include/] [linux/] [jffs2.h] - Blame information for rev 786

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1 786 skrzyp
/*
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 * JFFS2 -- Journalling Flash File System, Version 2.
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 *
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 * Copyright (C) 2001-2003 Red Hat, Inc.
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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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 * $Id: jffs2.h,v 1.36 2005/07/26 13:19:36 havasi Exp $
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 *
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 */
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#ifndef __LINUX_JFFS2_H__
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#define __LINUX_JFFS2_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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#define JFFS2_SUPER_MAGIC 0x72b6
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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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/* 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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/* 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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// 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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        uint32_t v32;
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} __attribute__((packed))  jint32_t;
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typedef struct {
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        uint32_t m;
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} __attribute__((packed))  jmode_t;
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typedef struct {
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        uint16_t 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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} __attribute__((packed));
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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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        uint8_t nsize;
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        uint8_t type;
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        uint8_t unused[2];
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        jint32_t node_crc;
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        jint32_t name_crc;
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        uint8_t name[0];
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} __attribute__((packed));
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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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        uint8_t compr;       /* Compression algorithm used */
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        uint8_t 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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        uint8_t data[0];
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} __attribute__((packed));
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union jffs2_node_union {
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        struct jffs2_raw_inode i;
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        struct jffs2_raw_dirent d;
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        struct jffs2_unknown_node u;
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};
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#endif /* __LINUX_JFFS2_H__ */

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