dumplfs.c

早期freebsd实现

/*-
 * 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.
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1991, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)dumplfs.c	8.1 (Berkeley) 6/5/93";
#endif /* not lint */

#include <sys/param.h>
#include <sys/ucred.h>
#include <sys/mount.h>
#include <sys/time.h>

#include <ufs/ufs/dinode.h>
#include <ufs/lfs/lfs.h>

#include <fcntl.h>
#include <fstab.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "extern.h"

static void	addseg __P((char *));
static void	dump_cleaner_info __P((struct lfs *, void *));
static void	dump_dinode __P((struct dinode *));
static void	dump_ifile __P((int, struct lfs *, int));
static int	dump_ipage_ifile __P((int, IFILE *, int));
static int	dump_ipage_segusage __P((struct lfs *, int, IFILE *, int));
static void	dump_segment __P((int, int, daddr_t, struct lfs *, int));
static int	dump_sum __P((int, struct lfs *, SEGSUM *, int, daddr_t));
static void	dump_super __P((struct lfs *));
static void	usage __P((void));

typedef struct seglist SEGLIST;
struct seglist {
        SEGLIST *next;
	int num;
};
SEGLIST	*seglist;

int daddr_shift;
char *special;

/* Segment Usage formats */
#define print_suheader \
	(void)printf("segnum\tflags\tnbytes\tninos\tnsums\tlastmod\n")

#define print_suentry(i, sp) \
	(void)printf("%d\t%c%c%c\t%d\t%d\t%d\t%s", i, \
	    (((sp)->su_flags & SEGUSE_ACTIVE) ? 'A' : ' '), \
	    (((sp)->su_flags & SEGUSE_DIRTY) ? 'D' : 'C'), \
	    (((sp)->su_flags & SEGUSE_SUPERBLOCK) ? 'S' : ' '), \
	    (sp)->su_nbytes, (sp)->su_ninos, (sp)->su_nsums, \
	    ctime((time_t *)&(sp)->su_lastmod))

/* Ifile formats */
#define print_iheader \
	(void)printf("inum\tstatus\tversion\tdaddr\t\tfreeptr\n")
#define print_ientry(i, ip) \
	if (ip->if_daddr == LFS_UNUSED_DADDR) \
		(void)printf("%d\tFREE\t%d\t \t\t%d\n", \
		    i, ip->if_version, ip->if_nextfree); \
	else \
		(void)printf("%d\tINUSE\t%d\t%8X    \n", \
		    i, ip->if_version, ip->if_daddr)
int
main(argc, argv)
	int argc;
	char *argv[];
{
	struct lfs lfs_sb1, lfs_sb2, *lfs_master;
	daddr_t seg_addr;
	int ch, do_allsb, do_ientries, fd, segnum;

	do_allsb = 0;
	do_ientries = 0;
	while ((ch = getopt(argc, argv, "ais:")) != EOF)
		switch(ch) {
		case 'a':		/* Dump all superblocks */
			do_allsb = 1;
			break;
		case 'i':		/* Dump ifile entries */
			do_ientries = 1;
			break;
		case 's':		/* Dump out these segments */
			addseg(optarg);
			break;
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc != 1)
		usage();

	special = argv[0];
	if ((fd = open(special, O_RDONLY, 0)) < 0)
		err("%s: %s", special, strerror(errno));

	/* Read the first superblock */
	get(fd, LFS_LABELPAD, &lfs_sb1, sizeof(struct lfs));
	daddr_shift = lfs_sb1.lfs_bshift - lfs_sb1.lfs_fsbtodb;

	/*
	 * Read the second superblock and figure out which check point is
	 * most up to date.
	 */
	get(fd,
	    lfs_sb1.lfs_sboffs[1] << daddr_shift, &lfs_sb2, sizeof(struct lfs));

	lfs_master = &lfs_sb1;
	if (lfs_sb1.lfs_tstamp < lfs_sb2.lfs_tstamp)
		lfs_master = &lfs_sb2;

	(void)printf("Master Superblock:\n");
	dump_super(lfs_master);

	dump_ifile(fd, lfs_master, do_ientries);

	if (seglist != NULL)
		for (; seglist != NULL; seglist = seglist->next) {
			seg_addr = lfs_master->lfs_sboffs[0] + seglist->num *
			    (lfs_master->lfs_ssize << lfs_master->lfs_fsbtodb);
			dump_segment(fd,
			    seglist->num, seg_addr, lfs_master, do_allsb);
		}
	else
		for (segnum = 0, seg_addr = lfs_master->lfs_sboffs[0];
		    segnum < lfs_master->lfs_nseg; segnum++, seg_addr +=
		    lfs_master->lfs_ssize << lfs_master->lfs_fsbtodb)
			dump_segment(fd,
			    segnum, seg_addr, lfs_master, do_allsb);

	(void)close(fd);
	exit(0);
}

/*
 * We are reading all the blocks of an inode and dumping out the ifile table.
 * This code could be tighter, but this is a first pass at getting the stuff
 * printed out rather than making this code incredibly efficient.
 */
static void
dump_ifile(fd, lfsp, do_ientries)
	int fd;
	struct lfs *lfsp;
	int do_ientries;
{
	IFILE *ipage;
	struct dinode *dip, *dpage;
	daddr_t addr, *addrp, *dindir, *iaddrp, *indir;
	int block_limit, i, inum, j, nblocks, nsupb, psize;

	psize = lfsp->lfs_bsize;
	addr = lfsp->lfs_idaddr;

	if (!(dpage = malloc(psize)))
		err("%s", strerror(errno));
	get(fd, addr << daddr_shift, dpage, psize);

	for (dip = dpage + INOPB(lfsp) - 1; dip >= dpage; --dip)
		if (dip->di_inumber == LFS_IFILE_INUM)
			break;

	if (dip < dpage)
		err("unable to locate ifile inode");

	(void)printf("\nIFILE inode\n");
	dump_dinode(dip);

	(void)printf("\nIFILE contents\n");
	nblocks = dip->di_size >> lfsp->lfs_bshift;
	block_limit = MIN(nblocks, NDADDR);

	/* Get the direct block */
	if ((ipage = malloc(psize)) == NULL)
		err("%s", strerror(errno));
	for (inum = 0, addrp = dip->di_db, i = 0; i < block_limit;
	    i++, addrp++) {
		get(fd, *addrp << daddr_shift, ipage, psize);
		if (i < lfsp->lfs_cleansz) {
			dump_cleaner_info(lfsp, ipage);
			print_suheader;
			continue;
		} 

		if (i < (lfsp->lfs_segtabsz + lfsp->lfs_cleansz)) {
			inum = dump_ipage_segusage(lfsp, inum, ipage, 
			    lfsp->lfs_sepb);
			if (!inum)
				if(!do_ientries)
					goto e0;
				else
					print_iheader;
		} else
			inum = dump_ipage_ifile(inum, ipage, lfsp->lfs_ifpb);

	}

	if (nblocks <= NDADDR)
		goto e0;

	/* Dump out blocks off of single indirect block */
	if (!(indir = malloc(psize)))
		err("%s", strerror(errno));
	get(fd, dip->di_ib[0] << daddr_shift, indir, psize);
	block_limit = MIN(i + lfsp->lfs_nindir, nblocks);
	for (addrp = indir; i < block_limit; i++, addrp++) {
		if (*addrp == LFS_UNUSED_DADDR)
			break;
		get(fd, *addrp << daddr_shift,ipage, psize);
		if (i < lfsp->lfs_cleansz) {
			dump_cleaner_info(lfsp, ipage);
			continue;
		} else 
			i -= lfsp->lfs_cleansz;

		if (i < lfsp->lfs_segtabsz) {
			inum = dump_ipage_segusage(lfsp, inum, ipage, 
			    lfsp->lfs_sepb);
			if (!inum)
				if(!do_ientries)
					goto e1;
				else
					print_iheader;
		} else
			inum = dump_ipage_ifile(inum, ipage, lfsp->lfs_ifpb);
	}

	if (nblocks <= lfsp->lfs_nindir * lfsp->lfs_ifpb)
		goto e1;

	/* Get the double indirect block */
	if (!(dindir = malloc(psize)))
		err("%s", strerror(errno));
	get(fd, dip->di_ib[1] << daddr_shift, dindir, psize);
	for (iaddrp = dindir, j = 0; j < lfsp->lfs_nindir; j++, iaddrp++) {
		if (*iaddrp == LFS_UNUSED_DADDR)
			break;
		get(fd, *iaddrp << daddr_shift, indir, psize);
		block_limit = MIN(i + lfsp->lfs_nindir, nblocks);
		for (addrp = indir; i < block_limit; i++, addrp++) {
			if (*addrp == LFS_UNUSED_DADDR)
				break;
			get(fd, *addrp << daddr_shift, ipage, psize);
			if (i < lfsp->lfs_cleansz) {
				dump_cleaner_info(lfsp, ipage);
				continue;
			} else 
				i -= lfsp->lfs_cleansz;

			if (i < lfsp->lfs_segtabsz) {
				inum = dump_ipage_segusage(lfsp,
				    inum, ipage, lfsp->lfs_sepb);
				if (!inum)
					if(!do_ientries)
						goto e2;
					else
						print_iheader;
			} else
				inum = dump_ipage_ifile(inum,
				    ipage, lfsp->lfs_ifpb);
		}
	}
e2:	free(dindir);
e1:	free(indir);
e0:	free(dpage);
	free(ipage);