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218 lines
7.6 KiB
C
218 lines
7.6 KiB
C
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright (C) 2001 Red Hat, Inc.
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*
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* Created by David Woodhouse <dwmw2@cambridge.redhat.com>
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*
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* The original JFFS, from which the design for JFFS2 was derived,
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* was designed and implemented by Axis Communications AB.
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*
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* The contents of this file are subject to the Red Hat eCos Public
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* License Version 1.1 (the "Licence"); you may not use this file
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* except in compliance with the Licence. You may obtain a copy of
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* the Licence at http://www.redhat.com/
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*
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* Software distributed under the Licence is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
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* See the Licence for the specific language governing rights and
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* limitations under the Licence.
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*
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* The Original Code is JFFS2 - Journalling Flash File System, version 2
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU General Public License version 2 (the "GPL"), in
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* which case the provisions of the GPL are applicable instead of the
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* above. If you wish to allow the use of your version of this file
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* only under the terms of the GPL and not to allow others to use your
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* version of this file under the RHEPL, indicate your decision by
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* deleting the provisions above and replace them with the notice and
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* other provisions required by the GPL. If you do not delete the
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* provisions above, a recipient may use your version of this file
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* under either the RHEPL or the GPL.
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*
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* $Id: jffs2.h,v 1.2 2002/01/17 00:53:20 nyet 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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#include <asm/types.h>
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#include <jffs2/load_kernel.h>
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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 0x5981 /* 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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#if defined(CONFIG_JFFS2_LZO_LZARI)
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#define JFFS2_COMPR_LZO 0x07
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#define JFFS2_COMPR_LZARI 0x08
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#define JFFS2_NUM_COMPR 9
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#else
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#define JFFS2_NUM_COMPR 7
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#endif
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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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/* Same as the non_ECC versions, but with extra space for real
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* ECC instead of just the checksum. For use on NAND flash
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*/
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/*#define JFFS2_NODETYPE_DIRENT_ECC (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 5) */
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/*#define JFFS2_NODETYPE_INODE_ECC (JFFS2_FEATURE_INCOMPAT | JFFS2_NODE_ACCURATE | 6) */
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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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struct jffs2_unknown_node
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{
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/* All start like this */
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__u16 magic;
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__u16 nodetype;
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__u32 totlen; /* So we can skip over nodes we don't grok */
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__u32 hdr_crc;
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} __attribute__((packed));
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struct jffs2_raw_dirent
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{
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__u16 magic;
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__u16 nodetype; /* == JFFS_NODETYPE_DIRENT */
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__u32 totlen;
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__u32 hdr_crc;
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__u32 pino;
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__u32 version;
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__u32 ino; /* == zero for unlink */
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__u32 mctime;
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__u8 nsize;
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__u8 type;
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__u8 unused[2];
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__u32 node_crc;
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__u32 name_crc;
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__u8 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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__u16 magic; /* A constant magic number. */
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__u16 nodetype; /* == JFFS_NODETYPE_INODE */
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__u32 totlen; /* Total length of this node (inc data, etc.) */
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__u32 hdr_crc;
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__u32 ino; /* Inode number. */
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__u32 version; /* Version number. */
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__u32 mode; /* The file's type or mode. */
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__u16 uid; /* The file's owner. */
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__u16 gid; /* The file's group. */
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__u32 isize; /* Total resultant size of this inode (used for truncations) */
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__u32 atime; /* Last access time. */
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__u32 mtime; /* Last modification time. */
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__u32 ctime; /* Change time. */
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__u32 offset; /* Where to begin to write. */
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__u32 csize; /* (Compressed) data size */
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__u32 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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__u16 flags; /* See JFFS2_INO_FLAG_* */
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__u32 data_crc; /* CRC for the (compressed) data. */
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__u32 node_crc; /* CRC for the raw inode (excluding data) */
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/* __u8 data[dsize]; */
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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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} __attribute__((packed));
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enum
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{
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DT_UNKNOWN = 0,
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# define DT_UNKNOWN DT_UNKNOWN
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DT_FIFO = 1,
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# define DT_FIFO DT_FIFO
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DT_CHR = 2,
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# define DT_CHR DT_CHR
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DT_DIR = 4,
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# define DT_DIR DT_DIR
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DT_BLK = 6,
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# define DT_BLK DT_BLK
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DT_REG = 8,
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# define DT_REG DT_REG
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DT_LNK = 10,
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# define DT_LNK DT_LNK
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DT_SOCK = 12,
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# define DT_SOCK DT_SOCK
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DT_WHT = 14
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# define DT_WHT DT_WHT
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};
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u32 jffs2_1pass_ls(struct part_info *part,const char *fname);
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u32 jffs2_1pass_load(char *dest, struct part_info *part,const char *fname);
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u32 jffs2_1pass_info(struct part_info *part);
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void rtime_decompress(unsigned char *data_in, unsigned char *cpage_out,
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u32 srclen, u32 destlen);
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void rubin_do_decompress(unsigned char *bits, unsigned char *in,
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unsigned char *page_out, __u32 destlen);
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void dynrubin_decompress(unsigned char *data_in, unsigned char *cpage_out,
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unsigned long sourcelen, unsigned long dstlen);
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long zlib_decompress(unsigned char *data_in, unsigned char *cpage_out,
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__u32 srclen, __u32 destlen);
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#if defined(CONFIG_JFFS2_LZO_LZARI)
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int lzo_decompress(unsigned char *data_in, unsigned char *cpage_out,
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u32 srclen, u32 destlen);
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int lzari_decompress(unsigned char *data_in, unsigned char *cpage_out,
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u32 srclen, u32 destlen);
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#endif
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char *mkmodestr(unsigned long mode, char *str);
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#endif /* __LINUX_JFFS2_H__ */
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