Source to ufs/lfs/lfs.h


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/*-
 * 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	8.1 (Berkeley) 6/11/93
 */

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

/*
 * XXX
 * This is a kluge and NEEDS to go away.
 *
 * Right now, ufs code handles most of the calls for directory operations
 * such as create, mkdir, link, etc.  As a result VOP_UPDATE is being
 * called with waitfor set (since ffs does these things synchronously).
 * Since LFS does not want to do these synchronously, we treat the last
 * argument to lfs_update as a set of flags.  If LFS_SYNC is set, then
 * the update should be synchronous, if not, do it asynchronously.
 * Unfortunately, this means that LFS won't work with NFS yet because
 * NFS goes through paths that will make normal calls to ufs which will
 * call lfs with a last argument of 1.
 */
#define	LFS_SYNC	0x02

/* On-disk and in-memory checkpoint segment usage structure. */
typedef struct segusage SEGUSE;
struct segusage {
	u_long	su_nbytes;		/* number of live bytes */
	u_long	su_lastmod;		/* SEGUSE last modified timestamp */
	u_short	su_nsums;		/* number of summaries in segment */
	u_short	su_ninos;		/* number of inode blocks in seg */
#define	SEGUSE_ACTIVE		0x1	/* segment is currently being written */
#define	SEGUSE_DIRTY		0x2	/* segment has data in it */
#define	SEGUSE_SUPERBLOCK	0x4	/* segment contains a superblock */
	u_long	su_flags;
};

#define	SEGUPB(fs)	(1 << (fs)->lfs_sushift)
#define	SEGTABSIZE_SU(fs) \
	(((fs)->lfs_nseg + SEGUPB(fs) - 1) >> (fs)->lfs_sushift)

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

/* On-disk and in-memory super block. */
struct lfs {
#define	LFS_MAGIC	0x070162
	u_long	lfs_magic;		/* magic number */
#define	LFS_VERSION	1
	u_long	lfs_version;		/* version number */

	u_long	lfs_size;		/* number of blocks in fs */
	u_long	lfs_ssize;		/* number of blocks per segment */
	u_long	lfs_dsize;		/* number of disk blocks in fs */
	u_long	lfs_bsize;		/* file system block size */
	u_long	lfs_fsize;		/* size of frag blocks in fs */
	u_long	lfs_frag;		/* number of frags in a block in fs */

/* Checkpoint region. */
	ino_t	lfs_free;		/* start of the free list */
	u_long	lfs_bfree;		/* number of free disk blocks */
	u_long	lfs_nfiles;		/* number of allocated inodes */
	long	lfs_avail;		/* blocks available for writing */
	u_long  lfs_uinodes;		/* inodes in cache not yet on disk */
	daddr_t	lfs_idaddr;		/* inode file disk address */
	ino_t	lfs_ifile;		/* inode file inode number */
	daddr_t	lfs_lastseg;		/* address of last segment written */
	daddr_t	lfs_nextseg;		/* address of next segment to write */
	daddr_t	lfs_curseg;		/* current segment being written */
	daddr_t	lfs_offset;		/* offset in curseg for next partial */
	daddr_t	lfs_lastpseg;		/* address of last partial written */
	u_long	lfs_tstamp;		/* time stamp */

/* These are configuration parameters. */
	u_long	lfs_minfree;		/* minimum percentage of free blocks */

/* These fields can be computed from the others. */
	u_quad_t lfs_maxfilesize;	/* maximum representable file size */
	u_long	lfs_dbpseg;		/* disk blocks per segment */
	u_long	lfs_inopb;		/* inodes per block */
	u_long	lfs_ifpb;		/* IFILE entries per block */
	u_long	lfs_sepb;		/* SEGUSE entries per block */
	u_long	lfs_nindir;		/* indirect pointers per block */
	u_long	lfs_nseg;		/* number of segments */
	u_long	lfs_nspf;		/* number of sectors per fragment */
	u_long	lfs_cleansz;		/* cleaner info size in blocks */
	u_long	lfs_segtabsz;		/* segment table size in blocks */

	u_long	lfs_segmask;		/* calculate offset within a segment */
	u_long	lfs_segshift;		/* fast mult/div for segments */
	u_long	lfs_bmask;		/* calc block offset from file offset */
	u_long	lfs_bshift;		/* calc block number from file offset */
	u_long	lfs_ffmask;		/* calc frag offset from file offset */
	u_long	lfs_ffshift;		/* fast mult/div for frag from file */
	u_long	lfs_fbmask;		/* calc frag offset from block offset */
	u_long	lfs_fbshift;		/* fast mult/div for frag from block */
	u_long	lfs_fsbtodb;		/* fsbtodb and dbtofsb shift constant */
	u_long	lfs_sushift;		/* fast mult/div for segusage table */

#define	LFS_MIN_SBINTERVAL	5	/* minimum superblock segment spacing */
#define	LFS_MAXNUMSB		10	/* superblock disk offsets */
	daddr_t	lfs_sboffs[LFS_MAXNUMSB];

/* 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_long	lfs_seglock;		/* single-thread the segment writer */
	pid_t	lfs_lockpid;		/* pid of lock holder */
	u_long	lfs_iocount;		/* number of ios pending */
	u_long	lfs_writer;		/* don't allow any dirops to start */
	u_long	lfs_dirops;		/* count of active directory ops */
	u_long	lfs_doifile;		/* Write ifile blocks on next write */
	u_long	lfs_nactive;		/* Number of segments since last ckp */
	u_char	lfs_fmod;		/* super block modified flag */
	u_char	lfs_clean;		/* file system is clean flag */
	u_char	lfs_ronly;		/* mounted read-only flag */
	u_char	lfs_flags;		/* currently unused flag */
	u_char	lfs_fsmnt[MNAMELEN];	/* name mounted on */
	u_char	pad[3];			/* long-align */

/* Checksum; valid on disk. */
	u_long	lfs_cksum;		/* checksum for superblock checking */
};

/*
 * Inode 0 is the out-of-band inode number, inode 1 is the inode number for
 * the IFILE, the root inode is 2 and the lost+found inode is 3.
 */

/* Fixed inode numbers. */
#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 address. */
#define	UNASSIGNED	-1

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

typedef struct ifile IFILE;
struct ifile {
	u_long	if_version;		/* inode version number */
#define	LFS_UNUSED_DADDR	0	/* out-of-band daddr */
	daddr_t	if_daddr;		/* inode disk address */
	ino_t	if_nextfree;		/* next-unallocated inode */
};

/*
 * Cleaner information structure.  This resides in the ifile and is used
 * to pass information between the cleaner and the kernel.
 */
typedef struct _cleanerinfo {
	u_long	clean;			/* K: number of clean segments */
	u_long	dirty;			/* K: number of dirty segments */
} 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_SUMMARY_SIZE	512

/* On-disk segment summary information */
typedef struct segsum SEGSUM;
struct segsum {
	u_long	ss_sumsum;		/* check sum of summary block */
	u_long	ss_datasum;		/* check sum of data */
	daddr_t	ss_next;		/* next segment */
	u_long	ss_create;		/* creation time stamp */
	u_short	ss_nfinfo;		/* number of file info structures */
	u_short	ss_ninos;		/* number of inodes in summary */
#define	SS_DIROP	0x01		/* segment begins a dirop */
#define	SS_CONT		0x02		/* more partials to finish this write*/
	u_short	ss_flags;		/* used for directory operations */
	u_short	ss_pad;			/* extra space */
	/* FINFO's and inode daddr's... */
};

/* 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)

#define	blksize(fs)		((fs)->lfs_bsize)
#define	blkoff(fs, loc)		((loc) & (fs)->lfs_bmask)
#define	fsbtodb(fs, b)		((b) << (fs)->lfs_fsbtodb)
#define	dbtofsb(fs, b)		((b) >> (fs)->lfs_fsbtodb)
#define	lblkno(fs, loc)		((loc) >> (fs)->lfs_bshift)
#define	lblktosize(fs, blk)	((blk) << (fs)->lfs_bshift)
#define numfrags(fs, loc)	/* calculates (loc / fs->fs_fsize) */ \
	((loc) >> (fs)->lfs_bshift)

#define	datosn(fs, daddr)	/* disk address to segment number */ \
	(((daddr) - (fs)->lfs_sboffs[0]) / fsbtodb((fs), (fs)->lfs_ssize))
#define sntoda(fs, sn) 		/* segment number to disk address */ \
	((daddr_t)((sn) * ((fs)->lfs_ssize << (fs)->lfs_fsbtodb) + \
	    (fs)->lfs_sboffs[0]))

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

/* Read in the block with a specific inode from the ifile. */
#define	LFS_IENTRY(IP, F, IN, BP) { \
	int _e; \
	VTOI((F)->lfs_ivnode)->i_flag |= IACC; \
	if (_e = bread((F)->lfs_ivnode, \
	    (IN) / (F)->lfs_ifpb + (F)->lfs_cleansz + (F)->lfs_segtabsz, \
	    (F)->lfs_bsize, NOCRED, &(BP))) \
		panic("lfs: ifile read %d", _e); \
	(IP) = (IFILE *)(BP)->b_un.b_addr + (IN) % (F)->lfs_ifpb; \
}

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

/* 
 * Determine if there is enough room currently available to write db
 * disk blocks.  We need enough blocks for the new blocks, the current,
 * inode blocks, a summary block, plus potentially the ifile inode and
 * the segment usage table, plus an ifile page.
 */
#define LFS_FITS(fs, db)						\
	((long)((db + ((fs)->lfs_uinodes + INOPB((fs))) / INOPB((fs)) +	\
	fsbtodb(fs, 1) + LFS_SUMMARY_SIZE / DEV_BSIZE + (fs)->lfs_segtabsz))\
	< (fs)->lfs_avail)

/* 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 # */
	daddr_t	bi_lbn;			/* logical block w/in file */
	daddr_t	bi_daddr;		/* disk address of block */
	time_t	bi_segcreate;		/* origin segment create time */
	int	bi_version;		/* file version number */
	void	*bi_bp;			/* data buffer */
} BLOCK_INFO;

/* 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 finfo	*fip;		/* current fileinfo pointer */
	struct vnode	*vp;		/* vnode being gathered */
	void	*segsum;		/* segment summary info */
	u_long	ninodes;		/* number of inodes in this segment */
	u_long	seg_bytes_left;		/* bytes left in segment */
	u_long	sum_bytes_left;		/* bytes left in summary block */
	u_long	seg_number;		/* number of this segment */
	daddr_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 */
	u_long	seg_flags;		/* run-time flags for this segment */
};

#define ISSPACE(F, BB, C) \
	(((C)->cr_uid == 0 && (F)->lfs_bfree >= (BB)) || \
	((C)->cr_uid != 0 && IS_FREESPACE(F, BB)))

#define IS_FREESPACE(F, BB) \
	((F)->lfs_bfree > ((F)->lfs_dsize * (F)->lfs_minfree / 100 + (BB)))

#define ISSPACE_XXX(F, BB) \
	((F)->lfs_bfree >= (BB))

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