xref: /src/sys/ufs/lfs/lfs.h

/*	$NetBSD: lfs.h,v 1.46 2003/02/17 23:48:16 perseant Exp $	*/

/*-
 * Copyright (c) 1999, 2000, 2001, 2002, 2003 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Konrad E. Schroder <perseant (at) hhhh.org>.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the NetBSD
 *      Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */
/*-
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *	@(#)lfs.h	8.9 (Berkeley) 5/8/95
 */

#ifndef _UFS_LFS_LFS_H_
#define _UFS_LFS_LFS_H_

/*
 * Compile-time options for LFS.
 */
#define LFS_IFIND_RETRIES	16
#define LFS_EAGAIN_FAIL          /* markv fail with EAGAIN if ino is locked */
#define LFS_DEBUG_RFW            /* print roll-forward debugging info */
#define LFS_NO_PAGEMOVE          /* Use malloc/copy to write clusters */
#define LFS_AGGRESSIVE_SEGLOCK
#define LFS_LOGLENGTH 1024

/* #define DEBUG_LFS */              /* Intensive debugging of LFS subsystem */

#ifdef LFS_NO_PAGEMOVE
# define LFS_MALLOC_SUMMARY
#endif

/*
 * Parameters and generic definitions
 */
#define BW_CLEAN	1
#define MIN_FREE_SEGS	2
#define LFS_MAX_ACTIVE	10
#ifndef LFS_ATIME_IFILE
# define LFS_ATIME_IFILE 0
#endif

/* Local definition for LFS's usage of PG_PAGER1 */
#define PG_DELWRI	PG_PAGER1

/* Types for lfs_newbuf and lfs_malloc */
#define LFS_NB_UNKNOWN -1
#define LFS_NB_SUMMARY	0
#define LFS_NB_SBLOCK	1
#define LFS_NB_IBLOCK	2
#define LFS_NB_CLUSTER	3
#define LFS_NB_CLEAN	4
#define LFS_NB_COUNT	5 /* always last */

/* Number of reserved memory blocks of each type */
#define LFS_N_SUMMARIES 2
#define LFS_N_SBLOCKS   1   /* Always 1, to throttle superblock writes */
#define LFS_N_IBLOCKS   16  /* In theory ssize/bsize; in practice around 2 */
#define LFS_N_CLUSTERS  16  /* In theory ssize/MAXPHYS */
#define LFS_N_CLEAN     0

/* Total count of "large" (non-pool) types */
#define LFS_N_TOTAL (LFS_N_SUMMARIES + LFS_N_SBLOCKS + LFS_N_IBLOCKS + LFS_N_CLUSTERS + LFS_N_CLEAN)

/* Counts for pool types */
#define LFS_N_CL        LFS_N_CLUSTERS
#define LFS_N_BPP       2
#define LFS_N_SEG	2

/* Structure to keep reserved blocks */
typedef struct lfs_res_blk {
	void *p;
	LIST_ENTRY(lfs_res_blk) res;
	char inuse;
} res_t;

/*
 * #define WRITE_THRESHHOLD    ((nbuf >> 1) - 10)
 * #define WAIT_THRESHHOLD     (nbuf - (nbuf >> 2) - 10)
 */
#define LFS_MAX_BUFS        ((nbuf >> 2) - 10)
#define LFS_WAIT_BUFS       ((nbuf >> 1) - (nbuf >> 3) - 10)
/* These are new ... is LFS taking up too much memory in its buffers? */
#define LFS_MAX_BYTES       (((bufpages >> 2) - 10) * NBPG)
#define LFS_WAIT_BYTES      (((bufpages >> 1) - (bufpages >> 3) - 10) * NBPG)
#define LFS_MAX_DIROP	    ((desiredvnodes >> 2) + (desiredvnodes >> 3))
#define LFS_BUFWAIT         2

#define LFS_MAX_PAGES \
     (((uvmexp.active + uvmexp.inactive + uvmexp.free) * uvmexp.filemin) >> 8)
#define LFS_WAIT_PAGES \
     (((uvmexp.active + uvmexp.inactive + uvmexp.free) * uvmexp.filemax) >> 8)

#define LFS_IS_MALLOC_BUF(bp) (((bp)->b_flags & B_CALL) && 		\
     ((bp)->b_iodone == lfs_callback || (bp)->b_iodone == lfs_fakebuf_iodone))

#define LFS_LOCK_BUF(bp) do {						\
	if (((bp)->b_flags & (B_LOCKED | B_CALL)) == 0) {		\
		++locked_queue_count;       				\
		locked_queue_bytes += bp->b_bufsize;			\
	}								\
	(bp)->b_flags |= B_LOCKED;					\
} while (0)

#define LFS_UNLOCK_BUF(bp) do {						\
	if (((bp)->b_flags & (B_LOCKED | B_CALL)) == B_LOCKED) {	\
		--locked_queue_count;       				\
		locked_queue_bytes -= bp->b_bufsize;			\
		if (locked_queue_count < LFS_WAIT_BUFS &&		\
		    locked_queue_bytes < LFS_WAIT_BYTES)		\
			wakeup(&locked_queue_count);			\
	}								\
	(bp)->b_flags &= ~B_LOCKED;					\
} while (0)

#ifdef DEBUG_LOCKED_LIST
# define LFS_DEBUG_COUNTLOCKED(m) do {                                  \
	int _s;                                                         \
	extern int locked_queue_count;					\
	extern long locked_queue_bytes;					\
        _s = splbio();							\
        lfs_countlocked(&locked_queue_count, &locked_queue_bytes, (m));	\
        splx(_s);							\
        wakeup(&locked_queue_count);					\
} while (0)
#else
# define LFS_DEBUG_COUNTLOCKED(m)
#endif

/* For convenience */
#define IN_ALLMOD (IN_MODIFIED|IN_ACCESS|IN_CHANGE|IN_UPDATE|IN_ACCESSED|IN_CLEANING)

#define LFS_SET_UINO(ip, flags) do {                                    \
        if (((flags) & IN_ACCESSED) && !((ip)->i_flag & IN_ACCESSED))   \
                ++(ip)->i_lfs->lfs_uinodes;                             \
        if (((flags) & IN_CLEANING) && !((ip)->i_flag & IN_CLEANING))   \
                ++(ip)->i_lfs->lfs_uinodes;                             \
        if (((flags) & IN_MODIFIED) && !((ip)->i_flag & IN_MODIFIED))   \
                ++(ip)->i_lfs->lfs_uinodes;                             \
        (ip)->i_flag |= (flags);                                        \
} while (0)

#define LFS_CLR_UINO(ip, flags) do {                                    \
        if (((flags) & IN_ACCESSED) && ((ip)->i_flag & IN_ACCESSED))    \
                --(ip)->i_lfs->lfs_uinodes;                             \
        if (((flags) & IN_CLEANING) && ((ip)->i_flag & IN_CLEANING))    \
                --(ip)->i_lfs->lfs_uinodes;                             \
        if (((flags) & IN_MODIFIED) && ((ip)->i_flag & IN_MODIFIED))    \
                --(ip)->i_lfs->lfs_uinodes;                             \
        (ip)->i_flag &= ~(flags);                                       \
	if ((ip)->i_lfs->lfs_uinodes < 0) {                             \
		panic("lfs_uinodes < 0");                               \
	}                                                               \
} while (0)

#ifdef DEBUG
struct lfs_log_entry {
	char *op;
	char *file;
	int line;
	daddr_t block;
	unsigned long flags;
};
extern int lfs_lognum;
extern struct lfs_log_entry lfs_log[LFS_LOGLENGTH];
# define LFS_BWRITE_LOG(bp) lfs_bwrite_log((bp), __FILE__, __LINE__)
# define LFS_ENTER_LOG(theop, thefile, theline, lbn, theflags) do { \
	int _s;							\
								\
	_s = splbio();						\
	lfs_log[lfs_lognum].op = theop;				\
	lfs_log[lfs_lognum].file = thefile;			\
	lfs_log[lfs_lognum].line = (theline);			\
	lfs_log[lfs_lognum].block = (lbn);			\
	lfs_log[lfs_lognum].flags = (theflags);			\
	lfs_lognum = (lfs_lognum + 1) % LFS_LOGLENGTH;		\
	splx(_s);						\
} while (0)

# define LFS_BCLEAN_LOG(fs, bp) do {					\
	if ((bp)->b_vp == (fs)->lfs_ivnode)				\
		LFS_ENTER_LOG("clear", __FILE__, __LINE__, bp->b_lblkno, bp->b_flags); \
} while (0)
#else
# define LFS_BCLEAN_LOG(fs, bp)
# define LFS_BWRITE_LOG(bp)		VOP_BWRITE((bp))
#endif

#define LFS_ITIMES(ip, acc, mod, cre)  do {				\
	struct lfs *_fs = (ip)->i_lfs;					\
									\
       	if ((ip)->i_flag & IN_ACCESS) {                        		\
		(ip)->i_ffs_atime = (acc)->tv_sec;			\
		(ip)->i_ffs_atimensec = (acc)->tv_nsec;			\
		if ((ip)->i_lfs->lfs_version > 1) {			\
			struct buf *ibp;				\
			IFILE *ifp;					\
									\
			LFS_IENTRY(ifp, ip->i_lfs, ip->i_number, ibp);	\
			ifp->if_atime_sec = (acc)->tv_sec;		\
			ifp->if_atime_nsec = (acc)->tv_nsec;		\
			LFS_BWRITE_LOG(ibp);				\
			_fs->lfs_flags |= LFS_IFDIRTY;			\
		} else {						\
			LFS_SET_UINO(ip, IN_ACCESSED);			\
		}                                              		\
	}								\
	if ((ip)->i_flag & (IN_CHANGE | IN_UPDATE)) {			\
		if ((ip)->i_flag & IN_UPDATE) {				\
			(ip)->i_ffs_mtime = (mod)->tv_sec;		\
			(ip)->i_ffs_mtimensec = (mod)->tv_nsec;		\
			(ip)->i_modrev++;				\
		}							\
		if ((ip)->i_flag & IN_CHANGE) {				\
			(ip)->i_ffs_ctime = (cre)->tv_sec;		\
			(ip)->i_ffs_ctimensec = (cre)->tv_nsec;		\
		}							\
		LFS_SET_UINO(ip, IN_MODIFIED);				\
	}								\
	(ip)->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);		\
} while (0)

/*
 * How to find out whether a vnode had dirty buffers or pages,
 * to know whether it needs to retain IN_MODIFIED after a write.
 */
#ifdef LFS_UBC
int lfs_checkifempty(struct vnode *);
#  define VPISEMPTY(vp)  lfs_checkifempty(vp)
#else
# define VPISEMPTY(vp)  ((vp)->v_dirtyblkhd.lh_first == NULL)
#endif
/*
 * WRITEINPROG does not use VPISEMPTY because any dirty pages will
 * have been given buffer headers, if they are "in progress".
 */
#define WRITEINPROG(vp) ((vp)->v_dirtyblkhd.lh_first && !(VTOI(vp)->i_flag & \
				(IN_MODIFIED | IN_ACCESSED | IN_CLEANING)))

/* Here begins the berkeley code */

#define	LFS_LABELPAD	8192		/* LFS label size */
#define	LFS_SBPAD	8192		/* LFS superblock size */

/* On-disk and in-memory checkpoint segment usage structure. */
typedef struct segusage SEGUSE;
struct segusage {
	u_int32_t su_nbytes;		/* 0: number of live bytes */
	u_int32_t su_olastmod;		/* 4: SEGUSE last modified timestamp */
	u_int16_t su_nsums;		/* 8: number of summaries in segment */
	u_int16_t su_ninos;		/* 10: number of inode blocks in seg */

#define	SEGUSE_ACTIVE		0x01	/*  segment currently being written */
#define	SEGUSE_DIRTY		0x02	/*  segment has data in it */
#define	SEGUSE_SUPERBLOCK	0x04	/*  segment contains a superblock */
#define SEGUSE_ERROR            0x08    /*  cleaner: do not clean segment */
#define SEGUSE_EMPTY            0x10    /*  segment is empty */
	u_int32_t su_flags;		/* 12: segment flags */
	u_int64_t su_lastmod;		/* 16: last modified timestamp */
};

typedef struct segusage_v1 SEGUSE_V1;
struct segusage_v1 {
	u_int32_t su_nbytes;		/* 0: number of live bytes */
	u_int32_t su_lastmod;		/* 4: SEGUSE last modified timestamp */
	u_int16_t su_nsums;		/* 8: number of summaries in segment */
	u_int16_t su_ninos;		/* 10: number of inode blocks in seg */
	u_int32_t su_flags;             /* 12: segment flags  */
};

#define	SEGUPB(fs)	(fs->lfs_sepb)
#define	SEGTABSIZE_SU(fs)						\
	(((fs)->lfs_nseg + SEGUPB(fs) - 1) / (fs)->lfs_sepb)

/* On-disk file information.  One per file with data blocks in the segment. */
typedef struct finfo FINFO;
struct finfo {
	u_int32_t fi_nblocks;		/* number of blocks */
	u_int32_t fi_version;		/* version number */
	u_int32_t fi_ino;		/* inode number */
	u_int32_t fi_lastlength;	/* length of last block in array */
	int32_t   fi_blocks[1];		/* array of logical block numbers */
};

/* sizeof FINFO except fi_blocks */
#define	FINFOSIZE	(sizeof(FINFO) - sizeof(int32_t))

/* On-disk super block. */
struct dlfs {
#define        LFS_MAGIC       0x070162
        u_int32_t dlfs_magic;     /* 0: magic number */
#define        LFS_VERSION     2
        u_int32_t dlfs_version;   /* 4: version number */

        u_int32_t dlfs_size;      /* 8: number of blocks in fs (v1) */
				  /*    number of frags in fs (v2) */
        u_int32_t dlfs_ssize;     /* 12: number of blocks per segment (v1) */
	                          /*     number of bytes per segment (v2) */
        u_int32_t dlfs_dsize;     /* 16: number of disk blocks in fs */
        u_int32_t dlfs_bsize;     /* 20: file system block size */
        u_int32_t dlfs_fsize;     /* 24: size of frag blocks in fs */
        u_int32_t dlfs_frag;      /* 28: number of frags in a block in fs */

/* Checkpoint region. */
        u_int32_t dlfs_freehd;      /* 32: start of the free list */
        u_int32_t dlfs_bfree;     /* 36: number of free disk blocks */
        u_int32_t dlfs_nfiles;    /* 40: number of allocated inodes */
        int32_t   dlfs_avail;     /* 44: blocks available for writing */
        int32_t   dlfs_uinodes;   /* 48: inodes in cache not yet on disk */
        int32_t   dlfs_idaddr;    /* 52: inode file disk address */
        u_int32_t dlfs_ifile;     /* 56: inode file inode number */
        int32_t   dlfs_lastseg; /* 60: address of last segment written */
        int32_t   dlfs_nextseg; /* 64: address of next segment to write */
        int32_t   dlfs_curseg; /* 68: current segment being written */
        int32_t   dlfs_offset; /* 72: offset in curseg for next partial */
        int32_t   dlfs_lastpseg; /* 76: address of last partial written */
	u_int32_t dlfs_inopf;     /* 80: v1: time stamp; v2: inodes per frag */
#define dlfs_otstamp dlfs_inopf

/* These are configuration parameters. */
        u_int32_t dlfs_minfree;   /* 84: minimum percentage of free blocks */

/* These fields can be computed from the others. */
        u_int64_t dlfs_maxfilesize; /* 88: maximum representable file size */
        u_int32_t dlfs_fsbpseg;     /* 96: fsb per segment */
        u_int32_t dlfs_inopb;     /* 100: inodes per block */
        u_int32_t dlfs_ifpb;      /* 104: IFILE entries per block */
        u_int32_t dlfs_sepb;      /* 108: SEGUSE entries per block */
        u_int32_t dlfs_nindir;    /* 112: indirect pointers per block */
        u_int32_t dlfs_nseg;      /* 116: number of segments */
        u_int32_t dlfs_nspf;      /* 120: number of sectors per fragment */
        u_int32_t dlfs_cleansz;   /* 124: cleaner info size in blocks */
        u_int32_t dlfs_segtabsz;  /* 128: segment table size in blocks */
        u_int32_t dlfs_segmask;   /* 132: calculate offset within a segment */
        u_int32_t dlfs_segshift;  /* 136: fast mult/div for segments */
        u_int32_t dlfs_bshift;    /* 140: calc block number from file offset */
        u_int32_t dlfs_ffshift;   /* 144: fast mult/div for frag from file */
        u_int32_t dlfs_fbshift;   /* 148: fast mult/div for frag from block */
        u_int64_t dlfs_bmask;     /* 152: calc block offset from file offset */
        u_int64_t dlfs_ffmask;    /* 160: calc frag offset from file offset */
        u_int64_t dlfs_fbmask;    /* 168: calc frag offset from block offset */
        u_int32_t dlfs_blktodb;   /* 176: blktodb and dbtoblk shift constant */
        u_int32_t dlfs_sushift;   /* 180: fast mult/div for segusage table */

        int32_t   dlfs_maxsymlinklen; /* 184: max length of an internal symlink */
#define LFS_MIN_SBINTERVAL      5  /* minimum superblock segment spacing */
#define LFS_MAXNUMSB            10 /* 188: superblock disk offsets */
        int32_t    dlfs_sboffs[LFS_MAXNUMSB];

	u_int32_t dlfs_nclean;    /* 228: Number of clean segments */
	u_char	  dlfs_fsmnt[MNAMELEN];	 /* 232: name mounted on */
#define LFS_PF_CLEAN 0x1
	u_int16_t dlfs_pflags;    /* 322: file system persistent flags */
	int32_t   dlfs_dmeta;     /* 324: total number of dirty summaries */
	u_int32_t dlfs_minfreeseg; /* 328: segs reserved for cleaner */
	u_int32_t dlfs_sumsize;   /* 332: size of summary blocks */
	u_int64_t dlfs_serial;    /* 336: serial number */
	u_int32_t dlfs_ibsize;    /* 344: size of inode blocks */
	int32_t   dlfs_start;   /* 348: start of segment 0 */
	u_int64_t dlfs_tstamp;    /* 352: time stamp */
#define LFS_44INODEFMT 0
#define LFS_MAXINODEFMT 0
	u_int32_t dlfs_inodefmt;  /* 360: inode format version */
	u_int32_t dlfs_interleave; /* 364: segment interleave */
	u_int32_t dlfs_ident;     /* 368: per-fs identifier */
	u_int32_t dlfs_fsbtodb;   /* 372: fsbtodb abd dbtodsb shift constant */
	int8_t    dlfs_pad[132];  /* 376: round to 512 bytes */
/* Checksum -- last valid disk field. */
	u_int32_t dlfs_cksum;     /* 508: checksum for superblock checking */
};

/* In-memory super block. */
struct lfs {
        struct dlfs lfs_dlfs;           /* on-disk parameters */
#define lfs_magic lfs_dlfs.dlfs_magic
#define lfs_version lfs_dlfs.dlfs_version
#define lfs_size lfs_dlfs.dlfs_size
#define lfs_ssize lfs_dlfs.dlfs_ssize
#define lfs_dsize lfs_dlfs.dlfs_dsize
#define lfs_bsize lfs_dlfs.dlfs_bsize
#define lfs_fsize lfs_dlfs.dlfs_fsize
#define lfs_frag lfs_dlfs.dlfs_frag
#define lfs_freehd lfs_dlfs.dlfs_freehd
#define lfs_bfree lfs_dlfs.dlfs_bfree
#define lfs_nfiles lfs_dlfs.dlfs_nfiles
#define lfs_avail lfs_dlfs.dlfs_avail
#define lfs_uinodes lfs_dlfs.dlfs_uinodes
#define lfs_idaddr lfs_dlfs.dlfs_idaddr
#define lfs_ifile lfs_dlfs.dlfs_ifile
#define lfs_lastseg lfs_dlfs.dlfs_lastseg
#define lfs_nextseg lfs_dlfs.dlfs_nextseg
#define lfs_curseg lfs_dlfs.dlfs_curseg
#define lfs_offset lfs_dlfs.dlfs_offset
#define lfs_lastpseg lfs_dlfs.dlfs_lastpseg
#define lfs_otstamp lfs_dlfs.dlfs_inopf
#define lfs_inopf lfs_dlfs.dlfs_inopf
#define lfs_minfree lfs_dlfs.dlfs_minfree
#define lfs_maxfilesize lfs_dlfs.dlfs_maxfilesize
#define lfs_fsbpseg lfs_dlfs.dlfs_fsbpseg
#define lfs_inopb lfs_dlfs.dlfs_inopb
#define lfs_ifpb lfs_dlfs.dlfs_ifpb
#define lfs_sepb lfs_dlfs.dlfs_sepb
#define lfs_nindir lfs_dlfs.dlfs_nindir
#define lfs_nseg lfs_dlfs.dlfs_nseg
#define lfs_nspf lfs_dlfs.dlfs_nspf
#define lfs_cleansz lfs_dlfs.dlfs_cleansz
#define lfs_segtabsz lfs_dlfs.dlfs_segtabsz
#define lfs_segmask lfs_dlfs.dlfs_segmask
#define lfs_segshift lfs_dlfs.dlfs_segshift
#define lfs_bmask lfs_dlfs.dlfs_bmask
#define lfs_bshift lfs_dlfs.dlfs_bshift
#define lfs_ffmask lfs_dlfs.dlfs_ffmask
#define lfs_ffshift lfs_dlfs.dlfs_ffshift
#define lfs_fbmask lfs_dlfs.dlfs_fbmask
#define lfs_fbshift lfs_dlfs.dlfs_fbshift
#define lfs_blktodb lfs_dlfs.dlfs_blktodb
#define lfs_fsbtodb lfs_dlfs.dlfs_fsbtodb
#define lfs_sushift lfs_dlfs.dlfs_sushift
#define lfs_maxsymlinklen lfs_dlfs.dlfs_maxsymlinklen
#define lfs_sboffs lfs_dlfs.dlfs_sboffs
#define lfs_cksum lfs_dlfs.dlfs_cksum
#define lfs_pflags lfs_dlfs.dlfs_pflags
#define lfs_fsmnt lfs_dlfs.dlfs_fsmnt
#define lfs_nclean lfs_dlfs.dlfs_nclean
#define lfs_dmeta lfs_dlfs.dlfs_dmeta
#define lfs_minfreeseg lfs_dlfs.dlfs_minfreeseg
#define lfs_sumsize lfs_dlfs.dlfs_sumsize
#define lfs_serial lfs_dlfs.dlfs_serial
#define lfs_ibsize lfs_dlfs.dlfs_ibsize
#define lfs_start lfs_dlfs.dlfs_start
#define lfs_tstamp lfs_dlfs.dlfs_tstamp
#define lfs_inodefmt lfs_dlfs.dlfs_inodefmt
#define lfs_interleave lfs_dlfs.dlfs_interleave
#define lfs_ident lfs_dlfs.dlfs_ident

/* These fields are set at mount time and are meaningless on disk. */
	struct segment *lfs_sp;		/* current segment being written */
	struct vnode *lfs_ivnode;	/* vnode for the ifile */
	u_int32_t  lfs_seglock;		/* single-thread the segment writer */
	pid_t	  lfs_lockpid;		/* pid of lock holder */
	u_int32_t lfs_iocount;		/* number of ios pending */
	u_int32_t lfs_writer;		/* don't allow any dirops to start */
	u_int32_t lfs_dirops;		/* count of active directory ops */
	u_int32_t lfs_doifile;		/* Write ifile blocks on next write */
	u_int32_t lfs_nactive;		/* Number of segments since last ckp */
	int8_t	  lfs_fmod;		/* super block modified flag */
	int8_t	  lfs_ronly;		/* mounted read-only flag */
#define LFS_NOTYET  0x01
#define LFS_IFDIRTY 0x02
#define LFS_WARNED  0x04
	int8_t	  lfs_flags;		/* currently unused flag */
	u_int16_t lfs_activesb;         /* toggle between superblocks */
	daddr_t   lfs_sbactive;         /* disk address of in-progress sb write */
	struct vnode *lfs_flushvp;      /* vnode being flushed */
	struct vnode *lfs_unlockvp;     /* being inactivated in lfs_segunlock */
	u_int32_t lfs_diropwait;	/* # procs waiting on dirop flush */
	size_t lfs_devbsize;		/* Device block size */
	size_t lfs_devbshift;		/* Device block shift */
	struct lock lfs_fraglock;
	pid_t lfs_rfpid;		/* Process ID of roll-forward agent */
	int       lfs_nadirop;		/* number of active dirop nodes */
	long      lfs_ravail;           /* blocks pre-reserved for writing */
	res_t *lfs_resblk;		/* Reserved memory for pageout */
	TAILQ_HEAD(, inode) lfs_dchainhd; /* dirop vnodes */
	TAILQ_HEAD(, inode) lfs_pchainhd; /* paging vnodes */
#define LFS_RESHASH_WIDTH 17
	LIST_HEAD(, lfs_res_blk) lfs_reshash[LFS_RESHASH_WIDTH];
	int       lfs_pdflush;           /* pagedaemon wants us to flush */
	u_int32_t **lfs_suflags;	/* Segment use flags */
	struct pool lfs_clpool;		/* Pool for struct lfs_cluster */
	struct pool lfs_bpppool;	/* Pool for bpp */
	struct pool lfs_segpool;	/* Pool for struct segment */
};

/*
 * Inode 0:	out-of-band inode number
 * Inode 1:	IFILE inode number
 * Inode 2:	root inode
 * Inode 3:	lost+found inode number
 */
#define	LFS_UNUSED_INUM	0		/* out of band inode number */
#define	LFS_IFILE_INUM	1		/* IFILE inode number */
#define	LOSTFOUNDINO	3		/* lost+found inode number */
#define	LFS_FIRST_INUM	4		/* first free inode number */

/* Address calculations for metadata located in the inode */
#define	S_INDIR(fs)	-NDADDR
#define	D_INDIR(fs)	(S_INDIR(fs) - NINDIR(fs) - 1)
#define	T_INDIR(fs)	(D_INDIR(fs) - NINDIR(fs) * NINDIR(fs) - 1)

/* Unassigned disk addresses. */
#define	UNASSIGNED	-1
#define UNWRITTEN       -2

/* Unused logical block number */
#define LFS_UNUSED_LBN	-1

typedef struct ifile IFILE;
struct ifile {
	u_int32_t if_version;		/* inode version number */
#define	LFS_UNUSED_DADDR	0	/* out-of-band daddr */
	int32_t   if_daddr;		/* inode disk address */
	ino_t	  if_nextfree;		/* next-unallocated inode */
	/* XXX - when inode format changes, this changes too */
	u_int32_t if_atime_sec;		/* Last access time, seconds */
	u_int32_t if_atime_nsec;	/* and nanoseconds */
};

typedef struct ifile_v1 IFILE_V1;
struct ifile_v1 {
	u_int32_t if_version;		/* inode version number */
	int32_t   if_daddr;		/* inode disk address */
	ino_t	  if_nextfree;		/* next-unallocated inode */
#if LFS_ATIME_IFILE
	struct timespec if_atime;	/* Last access time */
#endif
};

/*
 * Cleaner information structure.  This resides in the ifile and is used
 * to pass information between the cleaner and the kernel.
 */
typedef struct _cleanerinfo {
	u_int32_t clean;		/* number of clean segments */
	u_int32_t dirty;		/* number of dirty segments */
	u_int32_t bfree;		/* disk blocks free */
	int32_t   avail;		/* disk blocks available */
	u_int32_t free_head;            /* head of the inode free list */
	u_int32_t free_tail;            /* tail of the inode free list */
} CLEANERINFO;

#define	CLEANSIZE_SU(fs)						\
	((sizeof(CLEANERINFO) + (fs)->lfs_bsize - 1) >> (fs)->lfs_bshift)

/*
 * All summary blocks are the same size, so we can always read a summary
 * block easily from a segment.
 */
#define	LFS_V1_SUMMARY_SIZE	512
#define	LFS_DFL_SUMMARY_SIZE	512

/* On-disk segment summary information */
typedef struct segsum_v1 SEGSUM_V1;
struct segsum_v1 {
	u_int32_t ss_sumsum;		/* 0: check sum of summary block */
	u_int32_t ss_datasum;		/* 4: check sum of data */
	u_int32_t ss_magic;		/* 8: segment summary magic number */
#define SS_MAGIC	0x061561
	int32_t   ss_next;		/* 12: next segment */
	u_int32_t ss_create;		/* 16: creation time stamp */
	u_int16_t ss_nfinfo;		/* 20: number of file info structures */
	u_int16_t ss_ninos;		/* 22: number of inodes in summary */

#define	SS_DIROP	0x01		/* segment begins a dirop */
#define	SS_CONT		0x02		/* more partials to finish this write*/
	u_int16_t ss_flags;		/* 24: used for directory operations */
	u_int16_t ss_pad;		/* 26: extra space */
	/* FINFO's and inode daddr's... */
};

typedef struct segsum SEGSUM;
struct segsum {
	u_int32_t ss_sumsum;		/* 0: check sum of summary block */
	u_int32_t ss_datasum;		/* 4: check sum of data */
	u_int32_t ss_magic;		/* 8: segment summary magic number */
	int32_t   ss_next;		/* 12: next segment */
	u_int32_t ss_ident;		/* 16: roll-forward fsid */
#define ss_ocreate ss_ident /* ident is where create was in v1 */
	u_int16_t ss_nfinfo;		/* 20: number of file info structures */
	u_int16_t ss_ninos;		/* 22: number of inodes in summary */
	u_int16_t ss_flags;		/* 24: used for directory operations */
	u_int8_t  ss_pad[6];		/* 26: extra space */
	u_int64_t ss_serial;		/* 32: serial number */
	u_int64_t ss_create;		/* 40: time stamp */
	/* FINFO's and inode daddr's... */
};

#define SEGSUM_SIZE(fs) ((fs)->lfs_version == 1 ? sizeof(SEGSUM_V1) : sizeof(SEGSUM))

/* NINDIR is the number of indirects in a file system block. */
#define	NINDIR(fs)	((fs)->lfs_nindir)

/* INOPB is the number of inodes in a secondary storage block. */
#define	INOPB(fs)	((fs)->lfs_inopb)
/* INOPF is the number of inodes in a fragment. */
#define INOPF(fs)       ((fs)->lfs_inopf)

#define	blksize(fs, ip, lbn) \
	(((lbn) >= NDADDR || (ip)->i_ffs_size >= ((lbn) + 1) << (fs)->lfs_bshift) \
	    ? (fs)->lfs_bsize \
	    : (fragroundup(fs, blkoff(fs, (ip)->i_ffs_size))))
#define	blkoff(fs, loc)		((int)(loc) & (fs)->lfs_bmask)
#define fragoff(fs, loc)    /* calculates (loc % fs->lfs_fsize) */ \
    ((int)((loc) & (fs)->lfs_ffmask))
#define	fsbtodb(fs, b)		((b) << (fs)->lfs_fsbtodb)
#define	dbtofsb(fs, b)		((b) >> (fs)->lfs_fsbtodb)
#define fragstodb(fs, b)	((b) << ((fs)->lfs_blktodb - (fs)->lfs_fbshift))
#define dbtofrags(fs, b)	((b) >> ((fs)->lfs_blktodb - (fs)->lfs_fbshift))
#define	lblkno(fs, loc)		((loc) >> (fs)->lfs_bshift)
#define	lblktosize(fs, blk)	((blk) << (fs)->lfs_bshift)
/* Same as above, but named like dbtob(), btodb() */
#define fsbtob(fs, b)		((b) << ((fs)->lfs_bshift - \
				(fs)->lfs_blktodb + (fs)->lfs_fsbtodb))
#define btofsb(fs, b)		((b) >> ((fs)->lfs_bshift - \
				(fs)->lfs_blktodb + (fs)->lfs_fsbtodb))
#define fsbtofrags(fs, b)	((b) >> ((fs)->lfs_blktodb - (fs)->lfs_fbshift - \
				(fs)->lfs_fsbtodb))
#define fragstofsb(fs, b)	((b) << ((fs)->lfs_blktodb - (fs)->lfs_fbshift - \
				(fs)->lfs_fsbtodb))
#define btofrags(fs, b)		((b) >> (fs)->lfs_ffshift)
#define numfrags(fs, loc)	/* calculates (loc / fs->lfs_fsize) */	\
	((loc) >> (fs)->lfs_ffshift)
#define blkroundup(fs, size)	/* calculates roundup(size, fs->lfs_bsize) */ \
	((int)(((size) + (fs)->lfs_bmask) & (~(fs)->lfs_bmask)))
#define fragroundup(fs, size)	/* calculates roundup(size, fs->lfs_fsize) */ \
	((int)(((size) + (fs)->lfs_ffmask) & (~(fs)->lfs_ffmask)))
#define fragstoblks(fs, frags)	/* calculates (frags / fs->lfs_frag) */ \
	((frags) >> (fs)->lfs_fbshift)
#define blkstofrags(fs, blks)	/* calculates (blks * fs->lfs_frag) */ \
	((blks) << (fs)->lfs_fbshift)
#define fragnum(fs, fsb)	/* calculates (fsb % fs->lfs_frag) */ \
	((fsb) & ((fs)->lfs_frag - 1))
#define blknum(fs, fsb)		/* calculates rounddown(fsb, fs->lfs_frag) */ \
	((fsb) &~ ((fs)->lfs_frag - 1))
#define dblksize(fs, dip, lbn) \
	(((lbn) >= NDADDR || (dip)->di_size >= ((lbn) + 1) << (fs)->lfs_bshift)\
	    ? (fs)->lfs_bsize \
	    : (fragroundup(fs, blkoff(fs, (dip)->di_size))))

#define segtod(fs, seg) (((fs)->lfs_version == 1     ?       \
			   (fs)->lfs_ssize << (fs)->lfs_blktodb :       \
			   btofsb((fs), (fs)->lfs_ssize)) * (seg))
#define	dtosn(fs, daddr)	/* block address to segment number */	\
	((uint32_t)(((daddr) - (fs)->lfs_start) / segtod((fs), 1)))
#define sntod(fs, sn) 		/* segment number to disk address */	\
	((daddr_t)(segtod((fs), (sn)) + (fs)->lfs_start))

/* Read in the block with the cleaner info from the ifile. */
#define LFS_CLEANERINFO(CP, F, BP) do {					\
	VTOI((F)->lfs_ivnode)->i_flag |= IN_ACCESS;			\
	if (bread((F)->lfs_ivnode,					\
	    (daddr_t)0, (F)->lfs_bsize, NOCRED, &(BP)))		\
		panic("lfs: ifile read");				\
	(CP) = (CLEANERINFO *)(BP)->b_data;				\
} while(0)

/* Synchronize the Ifile cleaner info with current avail and bfree */
#define LFS_SYNC_CLEANERINFO(cip, fs, bp, w) do {                \
    if ((w) || (cip)->bfree != (fs)->lfs_bfree ||                \
        (cip)->avail != (fs)->lfs_avail - (fs)->lfs_ravail) {    \
	(cip)->bfree = (fs)->lfs_bfree;                          \
        (cip)->avail = (fs)->lfs_avail - (fs)->lfs_ravail;       \
        if (((bp)->b_flags & B_GATHERED) == 0)			 \
		(fs)->lfs_flags |= LFS_IFDIRTY;                  \
	(void) LFS_BWRITE_LOG(bp); /* Ifile */                       \
    } else                                                       \
	brelse(bp);                                              \
} while (0)

#define LFS_GET_HEADFREE(FS, CIP, BP, FREEP) do {                       \
	if ((FS)->lfs_version > 1) {                                    \
		LFS_CLEANERINFO((CIP), (FS), (BP));                     \
		(FS)->lfs_freehd = (CIP)->free_head;			\
		brelse(BP);                                             \
	}								\
	*(FREEP) = (FS)->lfs_freehd;					\
} while (0)

#define LFS_PUT_HEADFREE(FS, CIP, BP, VAL) do {                         \
	(FS)->lfs_freehd = (VAL);						\
	if ((FS)->lfs_version > 1) {                                    \
		LFS_CLEANERINFO((CIP), (FS), (BP));                     \
		(CIP)->free_head = (VAL);                 		\
		LFS_BWRITE_LOG(BP);                                         \
		(FS)->lfs_flags |= LFS_IFDIRTY;                          \
	}                                                               \
} while (0)

#define LFS_GET_TAILFREE(FS, CIP, BP, FREEP) do {                       \
	LFS_CLEANERINFO((CIP), (FS), (BP));                     	\
	*(FREEP) = (CIP)->free_tail;					\
	brelse(BP);                                             	\
} while (0)

#define LFS_PUT_TAILFREE(FS, CIP, BP, VAL) do {                         \
	LFS_CLEANERINFO((CIP), (FS), (BP));                     	\
	(CIP)->free_tail = (VAL);                 			\
	LFS_BWRITE_LOG(BP);                                         	\
	(FS)->lfs_flags |= LFS_IFDIRTY;                          \
} while (0)

/*
 * XXX - v1 compatibility code is not allowed to touch if_atime, since it
 * may not be mapped!
 */
/* Read in the block with a specific inode from the ifile. */
#define	LFS_IENTRY(IP, F, IN, BP) do {					\
	int _e;								\
	VTOI((F)->lfs_ivnode)->i_flag |= IN_ACCESS;			\
	if ((_e = bread((F)->lfs_ivnode,				\
    	(IN) / (F)->lfs_ifpb + (F)->lfs_cleansz + (F)->lfs_segtabsz,	\
    	(F)->lfs_bsize, NOCRED, &(BP))) != 0)				\
		panic("lfs: ifile read %d", _e);			\
	if ((F)->lfs_version == 1)					\
		(IP) = (IFILE *)((IFILE_V1 *)(BP)->b_data + (IN) % (F)->lfs_ifpb); \
	else								\
		(IP) = (IFILE *)(BP)->b_data + (IN) % (F)->lfs_ifpb;	\
} while(0)

/* Read in the block with a specific segment usage entry from the ifile. */
#define	LFS_SEGENTRY(SP, F, IN, BP) do {				\
	int _e;								\
	VTOI((F)->lfs_ivnode)->i_flag |= IN_ACCESS;			\
	if ((_e = bread((F)->lfs_ivnode,				\
	    ((IN) / (F)->lfs_sepb) + (F)->lfs_cleansz,			\
	    (F)->lfs_bsize, NOCRED, &(BP))) != 0)			\
		panic("lfs: ifile read: %d", _e);			\
	if ((F)->lfs_version == 1)					\
		(SP) = (SEGUSE *)((SEGUSE_V1 *)(BP)->b_data +		\
			((IN) & ((F)->lfs_sepb - 1)));			\
	else								\
		(SP) = (SEGUSE *)(BP)->b_data + ((IN) % (F)->lfs_sepb);	\
} while(0)

#define LFS_WRITESEGENTRY(SP, F, IN, BP) do {				\
	if ((SP)->su_nbytes == 0)					\
		(SP)->su_flags |= SEGUSE_EMPTY;				\
	else								\
		(SP)->su_flags &= ~SEGUSE_EMPTY;			\
	(F)->lfs_suflags[(F)->lfs_activesb][(IN)] = (SP)->su_flags;	\
	LFS_BWRITE_LOG(BP);						\
} while(0)

/* Determine if a buffer belongs to the ifile */
#define IS_IFILE(bp)	(VTOI(bp->b_vp)->i_number == LFS_IFILE_INUM)

/*
 * Structures used by lfs_bmapv and lfs_markv to communicate information
 * about inodes and data blocks.
 */
typedef struct block_info {
	ino_t	bi_inode;		/* inode # */
	/* XXX ondisk32 */
	int32_t bi_lbn;		/* logical block w/in file */
	int32_t bi_daddr;		/* disk address of block */
	u_int64_t   bi_segcreate;	/* origin segment create time */
	int	bi_version;		/* file version number */
	void	*bi_bp;			/* data buffer */
	int     bi_size;		/* size of the block (if fragment) */
} BLOCK_INFO;

/* Compatibility for 1.5 binaries */
typedef struct block_info_15 {
	ino_t	bi_inode;		/* inode # */
	/* XXX ondisk32 */
	int32_t bi_lbn;		/* logical block w/in file */
	int32_t bi_daddr;		/* disk address of block */
	u_int32_t   bi_segcreate;	/* origin segment create time */
	int	bi_version;		/* file version number */
	void	*bi_bp;			/* data buffer */
	int     bi_size;		/* size of the block (if fragment) */
} BLOCK_INFO_15;

/* In-memory description of a segment about to be written. */
struct segment {
	struct lfs	 *fs;		/* file system pointer */
	struct buf	**bpp;		/* pointer to buffer array */
	struct buf	**cbpp;		/* pointer to next available bp */
	struct buf	**start_bpp;	/* pointer to first bp in this set */
	struct buf	 *ibp;		/* buffer pointer to inode page */
	struct dinode    *idp;          /* pointer to ifile dinode */
	struct finfo	 *fip;		/* current fileinfo pointer */
	struct vnode	 *vp;		/* vnode being gathered */
	void	 *segsum;		/* segment summary info */
	u_int32_t ninodes;		/* number of inodes in this segment */
	u_int32_t seg_bytes_left;	/* bytes left in segment */
	u_int32_t sum_bytes_left;	/* bytes left in summary block */
	u_int32_t seg_number;		/* number of this segment */
	/* XXX ondisk32 */
	int32_t *start_lbp;		/* beginning lbn for this set */

#define	SEGM_CKP	0x01		/* doing a checkpoint */
#define	SEGM_CLEAN	0x02		/* cleaner call; don't sort */
#define	SEGM_SYNC	0x04		/* wait for segment */
#define	SEGM_PROT	0x08		/* don't inactivate at segunlock */
#define SEGM_PAGEDAEMON 0x10		/* pagedaemon called us */
	u_int16_t seg_flags;		/* run-time flags for this segment */
	u_int32_t seg_iocount;		/* number of ios pending */
	int	  ndupino;              /* number of duplicate inodes */
};

struct lfs_cluster {
	size_t bufsize;        /* Size of kept data */
	struct buf **bpp;      /* Array of kept buffers */
	int bufcount;          /* Number of kept buffers */
#define LFS_CL_MALLOC	0x00000001
#define LFS_CL_SHIFT	0x00000002
#define LFS_CL_SYNC	0x00000004
	u_int32_t flags;       /* Flags */
	struct lfs *fs;        /* LFS that this belongs to */
	struct segment *seg;   /* Segment structure, for LFS_CL_SYNC */
	void *saveaddr;        /* Original contents of saveaddr */
	char *olddata;	       /* Original b_data, if LFS_CL_MALLOC */
};

/*
 * LFS inode extensions; moved from <ufs/ufs/inode.h> so that file didn't
 * have to change every time LFS changed.
 */
struct lfs_inode_ext {
	off_t	  lfs_osize;		/* size of file on disk */
	u_int32_t lfs_effnblocks;  /* number of blocks when i/o completes */
	size_t    lfs_fragsize[NDADDR]; /* size of on-disk direct blocks */
	TAILQ_ENTRY(inode) lfs_dchain; /* Dirop chain. */
	TAILQ_ENTRY(inode) lfs_pchain; /* Paging chain. */
};
#define i_lfs_osize		inode_ext.lfs->lfs_osize
#define i_lfs_effnblks		inode_ext.lfs->lfs_effnblocks
#define i_lfs_fragsize		inode_ext.lfs->lfs_fragsize
#define i_lfs_dchain		inode_ext.lfs->lfs_dchain

/*
 * Macros for determining free space on the disk, with the variable metadata
 * of segment summaries and inode blocks taken into account.
 */
/* Estimate number of clean blocks not available for writing */
#define LFS_EST_CMETA(F) (int32_t)((((F)->lfs_dmeta *                        \
				     (int64_t)(F)->lfs_nclean) /             \
				      ((F)->lfs_nseg - (F)->lfs_nclean)))

/* Estimate total size of the disk not including metadata */
#define LFS_EST_NONMETA(F) ((F)->lfs_dsize - (F)->lfs_dmeta - LFS_EST_CMETA(F))

/* Estimate number of blocks actually available for writing */
#define LFS_EST_BFREE(F) ((F)->lfs_bfree - LFS_EST_CMETA(F) - (F)->lfs_dmeta)

/* Amount of non-meta space not available to mortal man */
#define LFS_EST_RSVD(F) (int32_t)((LFS_EST_NONMETA(F) *                      \
                                   (u_int64_t)(F)->lfs_minfree) /            \
			          100)

/* Can credential C write BB blocks */
#define ISSPACE(F, BB, C)						\
	((((C) == NOCRED || (C)->cr_uid == 0) &&			\
          LFS_EST_BFREE(F) >= (BB)) ||					\
	 ((C)->cr_uid != 0 && IS_FREESPACE(F, BB)))

/* Can an ordinary user write BB blocks */
#define IS_FREESPACE(F, BB)						\
          (LFS_EST_BFREE(F) >= (BB) + LFS_EST_RSVD(F))

/* Statistics Counters */
struct lfs_stats {
	u_int	segsused;
	u_int	psegwrites;
	u_int	psyncwrites;
	u_int	pcleanwrites;
	u_int	blocktot;
	u_int	cleanblocks;
	u_int	ncheckpoints;
	u_int	nwrites;
	u_int	nsync_writes;
	u_int	wait_exceeded;
	u_int	write_exceeded;
	u_int	flush_invoked;
	u_int	vflush_invoked;
};
#ifdef _KERNEL
extern struct lfs_stats lfs_stats;
#endif

#endif /* !_UFS_LFS_LFS_H_ */