ufs2.h

i386的bootloader源码grub

/*
 * Copyright (c) 2002 Networks Associates Technology, Inc.
 * All rights reserved.
 *
 * This software was developed for the FreeBSD Project by Marshall
 * Kirk McKusick and Network Associates Laboratories, the Security
 * Research Division of Network Associates, Inc. under DARPA/SPAWAR
 * contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
 * research program
 *
 * Copyright (c) 1982, 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The names of the authors may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)dinode.h	8.3 (Berkeley) 1/21/94
 * $FreeBSD: src/sys/ufs/ufs/dinode.h,v 1.11 2002/07/16 22:36:00 mckusick Exp $
 */

#ifndef _GRUB_UFS2_H_
#define _GRUB_UFS2_H_

typedef signed char            int8_t;
typedef signed short           int16_t;
typedef signed int             int32_t;
typedef signed long long int   int64_t;
typedef unsigned char          uint8_t;
typedef unsigned short         uint16_t;
typedef unsigned int           uint32_t;
typedef unsigned long long int uint64_t;

typedef uint8_t                u_char;
typedef uint32_t               u_int;

typedef uint8_t                u_int8_t;
typedef uint16_t               u_int16_t;
typedef uint32_t               u_int32_t;
typedef uint64_t               u_int64_t;

/*
 * __uint* constants already defined in
 * FreeBSD's /usr/include/machine/_types.h
 */
#ifndef _MACHINE__TYPES_H_
typedef uint8_t                __uint8_t;
typedef uint16_t               __uint16_t;
typedef uint32_t               __uint32_t;
typedef uint64_t               __uint64_t;
#endif /* _MACHINE__TYPES_H_ */

#define i_size di_size


#define DEV_BSIZE 512

/*
 * The root inode is the root of the filesystem.  Inode 0 can't be used for
 * normal purposes and historically bad blocks were linked to inode 1, thus
 * the root inode is 2.  (Inode 1 is no longer used for this purpose, however
 * numerous dump tapes make this assumption, so we are stuck with it).
 */
#define	ROOTINO	((ino_t)2)

/*
 * The size of physical and logical block numbers and time fields in UFS.
 */
typedef int32_t ufs1_daddr_t;
typedef	int64_t	ufs2_daddr_t;
typedef int64_t ufs_lbn_t;
typedef int64_t ufs_time_t;

/* inode number */
typedef __uint32_t      ino_t;

/* File permissions. */
#define	IEXEC		0000100		/* Executable. */
#define	IWRITE		0000200		/* Writeable. */
#define	IREAD		0000400		/* Readable. */
#define	ISVTX		0001000		/* Sticky bit. */
#define	ISGID		0002000		/* Set-gid. */
#define	ISUID		0004000		/* Set-uid. */

/* File types. */
#define	IFMT		0170000		/* Mask of file type. */
#define	IFIFO		0010000		/* Named pipe (fifo). */
#define	IFCHR		0020000		/* Character device. */
#define	IFDIR		0040000		/* Directory file. */
#define	IFBLK		0060000		/* Block device. */
#define	IFREG		0100000		/* Regular file. */
#define	IFLNK		0120000		/* Symbolic link. */
#define	IFSOCK		0140000		/* UNIX domain socket. */
#define	IFWHT		0160000		/* Whiteout. */

/*
 * A dinode contains all the meta-data associated with a UFS2 file.
 * This structure defines the on-disk format of a dinode. Since
 * this structure describes an on-disk structure, all its fields
 * are defined by types with precise widths.
 */

#define	NXADDR	2			/* External addresses in inode. */
#define	NDADDR	12			/* Direct addresses in inode. */
#define	NIADDR	3			/* Indirect addresses in inode. */

struct ufs1_dinode {
	u_int16_t       di_mode;        /*   0: IFMT, permissions; see below. */
	int16_t         di_nlink;       /*   2: File link count. */
	union {
		u_int16_t oldids[2];    /*   4: Ffs: old user and group ids. */
	} di_u;
	u_int64_t       di_size;        /*   8: File byte count. */
	int32_t         di_atime;       /*  16: Last access time. */
	int32_t         di_atimensec;   /*  20: Last access time. */
	int32_t         di_mtime;       /*  24: Last modified time. */
	int32_t         di_mtimensec;   /*  28: Last modified time. */
	int32_t         di_ctime;       /*  32: Last inode change time. */
	int32_t         di_ctimensec;   /*  36: Last inode change time. */
	ufs1_daddr_t    di_db[NDADDR];  /*  40: Direct disk blocks. */
	ufs1_daddr_t    di_ib[NIADDR];  /*  88: Indirect disk blocks. */
	u_int32_t       di_flags;       /* 100: Status flags (chflags). */
	int32_t         di_blocks;      /* 104: Blocks actually held. */
	int32_t         di_gen;         /* 108: Generation number. */
	u_int32_t       di_uid;         /* 112: File owner. */
	u_int32_t       di_gid;         /* 116: File group. */
	int32_t         di_spare[2];    /* 120: Reserved; currently unused */
};

struct ufs2_dinode {
	u_int16_t	di_mode;	/*   0: IFMT, permissions; see below. */
	int16_t		di_nlink;	/*   2: File link count. */
	u_int32_t	di_uid;		/*   4: File owner. */
	u_int32_t	di_gid;		/*   8: File group. */
	u_int32_t	di_blksize;	/*  12: Inode blocksize. */
	u_int64_t	di_size;	/*  16: File byte count. */
	u_int64_t	di_blocks;	/*  24: Bytes actually held. */
	ufs_time_t	di_atime;	/*  32: Last access time. */
	ufs_time_t	di_mtime;	/*  40: Last modified time. */
	ufs_time_t	di_ctime;	/*  48: Last inode change time. */
	ufs_time_t	di_birthtime;	/*  56: Inode creation time. */
	int32_t		di_mtimensec;	/*  64: Last modified time. */
	int32_t		di_atimensec;	/*  68: Last access time. */
	int32_t		di_ctimensec;	/*  72: Last inode change time. */
	int32_t		di_birthnsec;	/*  76: Inode creation time. */
	int32_t		di_gen;		/*  80: Generation number. */
	u_int32_t	di_kernflags;	/*  84: Kernel flags. */
	u_int32_t	di_flags;	/*  88: Status flags (chflags). */
	int32_t		di_extsize;	/*  92: External attributes block. */
	ufs2_daddr_t	di_extb[NXADDR];/*  96: External attributes block. */
	ufs2_daddr_t	di_db[NDADDR];	/* 112: Direct disk blocks. */
	ufs2_daddr_t	di_ib[NIADDR];	/* 208: Indirect disk blocks. */
	int64_t		di_spare[3];	/* 232: Reserved; currently unused */
};

#define	MAXNAMLEN	255

struct	direct {
	u_int32_t d_ino;		/* inode number of entry */
	u_int16_t d_reclen;		/* length of this record */
	u_int8_t  d_type; 		/* file type, see below */
	u_int8_t  d_namlen;		/* length of string in d_name */
	char	  d_name[MAXNAMLEN + 1];/* name with length <= MAXNAMLEN */
};

/*
 * File types
 */
#define DT_UNKNOWN       0
#define DT_FIFO          1
#define DT_CHR           2
#define DT_DIR           4
#define DT_BLK           6
#define DT_REG           8
#define DT_LNK          10
#define DT_SOCK         12
#define DT_WHT          14

/*
 * Superblock offsets
 */
#define SBLOCK_FLOPPY        0
#define SBLOCK_UFS1       8192
#define SBLOCK_UFS2      65536
#define SBLOCK_PIGGY    262144
#define SBLOCKSIZE        8192
#define SBLOCKSEARCH \
	{ SBLOCK_UFS2, SBLOCK_UFS1, SBLOCK_FLOPPY, SBLOCK_PIGGY, -1 }

#define MAXMNTLEN	512

#define	NOCSPTRS	((128 / sizeof(void *)) - 4)

/*
 * The maximum number of snapshot nodes that can be associated
 * with each filesystem. This limit affects only the number of
 * snapshot files that can be recorded within the superblock so
 * that they can be found when the filesystem is mounted. However,
 * maintaining too many will slow the filesystem performance, so
 * having this limit is a good idea.