ufs_fs.h

umon bootloader source code, support mips cpu.

	__fs16  d_reclen;		/* length of this entry */
	union {
		__fs16	d_namlen;		/* actual length of d_name */
		struct {
			__u8	d_type;		/* file type */
			__u8	d_namlen;	/* length of string in d_name */
		} d_44;
	} d_u;
	__u8	d_name[UFS_MAXNAMLEN + 1];	/* file name */
};

struct ufs_csum {
	__fs32	cs_ndir;	/* number of directories */
	__fs32	cs_nbfree;	/* number of free blocks */
	__fs32	cs_nifree;	/* number of free inodes */
	__fs32	cs_nffree;	/* number of free frags */
};
struct ufs2_csum_total {
	__fs64	cs_ndir;	/* number of directories */
	__fs64	cs_nbfree;	/* number of free blocks */
	__fs64	cs_nifree;	/* number of free inodes */
	__fs64	cs_nffree;	/* number of free frags */
	__fs64   cs_numclusters;	/* number of free clusters */
	__fs64   cs_spare[3];	/* future expansion */
};

/*
 * This is the actual superblock, as it is laid out on the disk.
 */
struct ufs_super_block {
	__fs32	fs_link;	/* UNUSED */
	__fs32	fs_rlink;	/* UNUSED */
	__fs32	fs_sblkno;	/* addr of super-block in filesys */
	__fs32	fs_cblkno;	/* offset of cyl-block in filesys */
	__fs32	fs_iblkno;	/* offset of inode-blocks in filesys */
	__fs32	fs_dblkno;	/* offset of first data after cg */
	__fs32	fs_cgoffset;	/* cylinder group offset in cylinder */
	__fs32	fs_cgmask;	/* used to calc mod fs_ntrak */
	__fs32	fs_time;	/* last time written -- time_t */
	__fs32	fs_size;	/* number of blocks in fs */
	__fs32	fs_dsize;	/* number of data blocks in fs */
	__fs32	fs_ncg;		/* number of cylinder groups */
	__fs32	fs_bsize;	/* size of basic blocks in fs */
	__fs32	fs_fsize;	/* size of frag blocks in fs */
	__fs32	fs_frag;	/* number of frags in a block in fs */
/* these are configuration parameters */
	__fs32	fs_minfree;	/* minimum percentage of free blocks */
	__fs32	fs_rotdelay;	/* num of ms for optimal next block */
	__fs32	fs_rps;		/* disk revolutions per second */
/* these fields can be computed from the others */
	__fs32	fs_bmask;	/* ``blkoff'' calc of blk offsets */
	__fs32	fs_fmask;	/* ``fragoff'' calc of frag offsets */
	__fs32	fs_bshift;	/* ``lblkno'' calc of logical blkno */
	__fs32	fs_fshift;	/* ``numfrags'' calc number of frags */
/* these are configuration parameters */
	__fs32	fs_maxcontig;	/* max number of contiguous blks */
	__fs32	fs_maxbpg;	/* max number of blks per cyl group */
/* these fields can be computed from the others */
	__fs32	fs_fragshift;	/* block to frag shift */
	__fs32	fs_fsbtodb;	/* fsbtodb and dbtofsb shift constant */
	__fs32	fs_sbsize;	/* actual size of super block */
	__fs32	fs_csmask;	/* csum block offset */
	__fs32	fs_csshift;	/* csum block number */
	__fs32	fs_nindir;	/* value of NINDIR */
	__fs32	fs_inopb;	/* value of INOPB */
	__fs32	fs_nspf;	/* value of NSPF */
/* yet another configuration parameter */
	__fs32	fs_optim;	/* optimization preference, see below */
/* these fields are derived from the hardware */
	union {
		struct {
			__fs32	fs_npsect;	/* # sectors/track including spares */
		} fs_sun;
		struct {
			__fs32	fs_state;	/* file system state time stamp */
		} fs_sunx86;
	} fs_u1;
	__fs32	fs_interleave;	/* hardware sector interleave */
	__fs32	fs_trackskew;	/* sector 0 skew, per track */
/* a unique id for this filesystem (currently unused and unmaintained) */
/* In 4.3 Tahoe this space is used by fs_headswitch and fs_trkseek */
/* Neither of those fields is used in the Tahoe code right now but */
/* there could be problems if they are.                            */
	__fs32	fs_id[2];	/* file system id */
/* sizes determined by number of cylinder groups and their sizes */
	__fs32	fs_csaddr;	/* blk addr of cyl grp summary area */
	__fs32	fs_cssize;	/* size of cyl grp summary area */
	__fs32	fs_cgsize;	/* cylinder group size */
/* these fields are derived from the hardware */
	__fs32	fs_ntrak;	/* tracks per cylinder */
	__fs32	fs_nsect;	/* sectors per track */
	__fs32	fs_spc;		/* sectors per cylinder */
/* this comes from the disk driver partitioning */
	__fs32	fs_ncyl;	/* cylinders in file system */
/* these fields can be computed from the others */
	__fs32	fs_cpg;		/* cylinders per group */
	__fs32	fs_ipg;		/* inodes per cylinder group */
	__fs32	fs_fpg;		/* blocks per group * fs_frag */
/* this data must be re-computed after crashes */
	struct ufs_csum fs_cstotal;	/* cylinder summary information */
/* these fields are cleared at mount time */
	__s8	fs_fmod;	/* super block modified flag */
	__s8	fs_clean;	/* file system is clean flag */
	__s8	fs_ronly;	/* mounted read-only flag */
	__s8	fs_flags;	/* currently unused flag */
	union {
		struct {
			__s8	fs_fsmnt[UFS_MAXMNTLEN];/* name mounted on */
			__fs32	fs_cgrotor;	/* last cg searched */
			__fs32	fs_csp[UFS_MAXCSBUFS];/*list of fs_cs info buffers */
			__fs32	fs_maxcluster;
			__fs32	fs_cpc;		/* cyl per cycle in postbl */
			__fs16	fs_opostbl[16][8]; /* old rotation block list head */
		} fs_u1;
		struct {
			__s8  fs_fsmnt[UFS2_MAXMNTLEN];	/* name mounted on */
			__u8   fs_volname[UFS2_MAXVOLLEN]; /* volume name */
			__fs64  fs_swuid;		/* system-wide uid */
			__fs32  fs_pad;	/* due to alignment of fs_swuid */
			__fs32   fs_cgrotor;     /* last cg searched */
			__fs32   fs_ocsp[UFS2_NOCSPTRS]; /*list of fs_cs info buffers */
			__fs32   fs_contigdirs;/*# of contiguously allocated dirs */
			__fs32   fs_csp;	/* cg summary info buffer for fs_cs */
			__fs32   fs_maxcluster;
			__fs32   fs_active;/* used by snapshots to track fs */
			__fs32   fs_old_cpc;	/* cyl per cycle in postbl */
			__fs32   fs_maxbsize;/*maximum blocking factor permitted */
			__fs64   fs_sparecon64[17];/*old rotation block list head */
			__fs64   fs_sblockloc; /* byte offset of standard superblock */
			struct  ufs2_csum_total fs_cstotal;/*cylinder summary information*/
			struct  ufs_timeval    fs_time;		/* last time written */
			__fs64    fs_size;		/* number of blocks in fs */
			__fs64    fs_dsize;	/* number of data blocks in fs */
			__fs64   fs_csaddr;	/* blk addr of cyl grp summary area */
			__fs64    fs_pendingblocks;/* blocks in process of being freed */
			__fs32    fs_pendinginodes;/*inodes in process of being freed */
		} fs_u2;
	}  fs_u11;
	union {
		struct {
			__fs32	fs_sparecon[53];/* reserved for future constants */
			__fs32	fs_reclaim;
			__fs32	fs_sparecon2[1];
			__fs32	fs_state;	/* file system state time stamp */
			__fs32	fs_qbmask[2];	/* ~usb_bmask */
			__fs32	fs_qfmask[2];	/* ~usb_fmask */
		} fs_sun;
		struct {
			__fs32	fs_sparecon[53];/* reserved for future constants */
			__fs32	fs_reclaim;
			__fs32	fs_sparecon2[1];
			__fs32	fs_npsect;	/* # sectors/track including spares */
			__fs32	fs_qbmask[2];	/* ~usb_bmask */
			__fs32	fs_qfmask[2];	/* ~usb_fmask */
		} fs_sunx86;
		struct {
			__fs32	fs_sparecon[50];/* reserved for future constants */
			__fs32	fs_contigsumsize;/* size of cluster summary array */
			__fs32	fs_maxsymlinklen;/* max length of an internal symlink */
			__fs32	fs_inodefmt;	/* format of on-disk inodes */
			__fs32	fs_maxfilesize[2];	/* max representable file size */
			__fs32	fs_qbmask[2];	/* ~usb_bmask */
			__fs32	fs_qfmask[2];	/* ~usb_fmask */
			__fs32	fs_state;	/* file system state time stamp */
		} fs_44;
	} fs_u2;
	__fs32	fs_postblformat;	/* format of positional layout tables */
	__fs32	fs_nrpos;		/* number of rotational positions */
	__fs32	fs_postbloff;		/* (__s16) rotation block list head */
	__fs32	fs_rotbloff;		/* (__u8) blocks for each rotation */
	__fs32	fs_magic;		/* magic number */
	__u8	fs_space[1];		/* list of blocks for each rotation */
};

/*
 * Preference for optimization.
 */
#define UFS_OPTTIME	0	/* minimize allocation time */
#define UFS_OPTSPACE	1	/* minimize disk fragmentation */

/*
 * Rotational layout table format types
 */
#define UFS_42POSTBLFMT		-1	/* 4.2BSD rotational table format */
#define UFS_DYNAMICPOSTBLFMT	1	/* dynamic rotational table format */

/*
 * Convert cylinder group to base address of its global summary info.
 */
#define fs_cs(indx) \
	s_csp[(indx) >> uspi->s_csshift][(indx) & ~uspi->s_csmask]

/*
 * Cylinder group block for a file system.
 *
 * Writable fields in the cylinder group are protected by the associated
 * super block lock fs->fs_lock.
 */
#define	CG_MAGIC	0x090255
#define ufs_cg_chkmagic(sb, ucg) \
	(fs32_to_cpu((sb), (ucg)->cg_magic) == CG_MAGIC)

/*
 * size of this structure is 172 B
 */
struct	ufs_cylinder_group {
	__fs32	cg_link;		/* linked list of cyl groups */
	__fs32	cg_magic;		/* magic number */
	__fs32	cg_time;		/* time last written */
	__fs32	cg_cgx;			/* we are the cgx'th cylinder group */
	__fs16	cg_ncyl;		/* number of cyl's this cg */
	__fs16	cg_niblk;		/* number of inode blocks this cg */
	__fs32	cg_ndblk;		/* number of data blocks this cg */
	struct	ufs_csum cg_cs;		/* cylinder summary information */
	__fs32	cg_rotor;		/* position of last used block */
	__fs32	cg_frotor;		/* position of last used frag */
	__fs32	cg_irotor;		/* position of last used inode */
	__fs32	cg_frsum[UFS_MAXFRAG];	/* counts of available frags */
	__fs32	cg_btotoff;		/* (__u32) block totals per cylinder */
	__fs32	cg_boff;		/* (short) free block positions */
	__fs32	cg_iusedoff;		/* (char) used inode map */
	__fs32	cg_freeoff;		/* (u_char) free block map */
	__fs32	cg_nextfreeoff;		/* (u_char) next available space */
	union {
		struct {
			__fs32	cg_clustersumoff;	/* (u_int32) counts of avail clusters */
			__fs32	cg_clusteroff;		/* (u_int8) free cluster map */
			__fs32	cg_nclusterblks;	/* number of clusters this cg */
			__fs32	cg_sparecon[13];	/* reserved for future use */
		} cg_44;
		struct {
			__fs32	cg_clustersumoff;/* (u_int32) counts of avail clusters */
			__fs32	cg_clusteroff;	/* (u_int8) free cluster map */
			__fs32	cg_nclusterblks;/* number of clusters this cg */
			__fs32   cg_niblk; /* number of inode blocks this cg */
			__fs32   cg_initediblk;	/* last initialized inode */
			__fs32   cg_sparecon32[3];/* reserved for future use */
			__fs64   cg_time;	/* time last written */
			__fs64	cg_sparecon[3];	/* reserved for future use */
		} cg_u2;
		__fs32	cg_sparecon[16];	/* reserved for future use */
	} cg_u;
	__u8	cg_space[1];		/* space for cylinder group maps */
/* actually longer */
};

/*
 * structure of an on-disk inode
 */
struct ufs_inode {
	__fs16	ui_mode;		/*  0x0 */
	__fs16	ui_nlink;		/*  0x2 */
	union {
		struct {
			__fs16	ui_suid;	/*  0x4 */
			__fs16	ui_sgid;	/*  0x6 */
		} oldids;
		__fs32	ui_inumber;		/*  0x4 lsf: inode number */
		__fs32	ui_author;		/*  0x4 GNU HURD: author */
	} ui_u1;
	__fs64	ui_size;		/*  0x8 */
	struct ufs_timeval ui_atime;	/* 0x10 access */
	struct ufs_timeval ui_mtime;	/* 0x18 modification */
	struct ufs_timeval ui_ctime;	/* 0x20 creation */
	union {
		struct {
			__fs32	ui_db[UFS_NDADDR];/* 0x28 data blocks */
			__fs32	ui_ib[UFS_NINDIR];/* 0x58 indirect blocks */
		} ui_addr;
		__u8	ui_symlink[4*(UFS_NDADDR+UFS_NINDIR)];/* 0x28 fast symlink */
	} ui_u2;
	__fs32	ui_flags;		/* 0x64 immutable, append-only... */
	__fs32	ui_blocks;		/* 0x68 blocks in use */
	__fs32	ui_gen;			/* 0x6c like ext2 i_version, for NFS support */
	union {
		struct {
			__fs32	ui_shadow;	/* 0x70 shadow inode with security data */
			__fs32	ui_uid;		/* 0x74 long EFT version of uid */
			__fs32	ui_gid;		/* 0x78 long EFT version of gid */
			__fs32	ui_oeftflag;	/* 0x7c reserved */
		} ui_sun;
		struct {
			__fs32	ui_uid;		/* 0x70 File owner */
			__fs32	ui_gid;		/* 0x74 File group */
			__fs32	ui_spare[2];	/* 0x78 reserved */
		} ui_44;
		struct {
			__fs32	ui_uid;		/* 0x70 */
			__fs32	ui_gid;		/* 0x74 */
			__fs16	ui_modeh;	/* 0x78 mode high bits */
			__fs16	ui_spare;	/* 0x7A unused */
			__fs32	ui_trans;	/* 0x7c filesystem translator */
		} ui_hurd;
	} ui_u3;
};

#define UFS_NXADDR  2            /* External addresses in inode. */
struct ufs2_inode {
	__fs16     ui_mode;        /*   0: IFMT, permissions; see below. */
	__fs16     ui_nlink;       /*   2: File link count. */
	__fs32     ui_uid;         /*   4: File owner. */
	__fs32     ui_gid;         /*   8: File group. */
	__fs32     ui_blksize;     /*  12: Inode blocksize. */
	__fs64     ui_size;        /*  16: File byte count. */
	__fs64     ui_blocks;      /*  24: Bytes actually held. */
	struct ufs_timeval   ui_atime;       /*  32: Last access time. */
	struct ufs_timeval   ui_mtime;       /*  40: Last modified time. */
	struct ufs_timeval   ui_ctime;       /*  48: Last inode change time. */
	struct ufs_timeval   ui_birthtime;   /*  56: Inode creation time. */
	__fs32     ui_mtimensec;   /*  64: Last modified time. */
	__fs32     ui_atimensec;   /*  68: Last access time. */
	__fs32     ui_ctimensec;   /*  72: Last inode change time. */
	__fs32     ui_birthnsec;   /*  76: Inode creation time. */
	__fs32     ui_gen;         /*  80: Generation number. */
	__fs32     ui_kernflags;   /*  84: Kernel flags. */