Date: Wed, 19 Feb 2003 22:20:12 +0100 From: Michael Ranner <mranner@inode.at> To: freebsd-fs@freebsd.org Cc: freebsd-hackers@freebsd.org Subject: scan_ffs for UFS2 Message-ID: <200302192220.12731.mranner@inode.at>
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--Boundary-00=_MU/U+5seNB+VrtY Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline Hello! I am trying to learn scan_ffs (original from OpenBSD, ported to FreeBSD by Robert Watson) about UFS2 on 5-CURRENT, but it will not find the Superblock and I dont understand exactly both for loops, especially that 512 byte increment. Scan_ffs is a system tool from OpenBSD to recover erased disklabels from your hard drive. Thanks for your input. -- /\/\ichael Ranner mranner@jawa.at - mranner@bitonline.cc - webmaster@mariazell.at ---------------------------------------------------------------------- JAWA Management Software GmbH - http://www.jawa.at/ Liebenauer Hauptstrasse 2oo - A-8041 Graz Tel +43 316 403274 21 - Fax +43 316 403274 10 ---------------------------------------------------------------------- Mariazell Online - http://www.mariazell.at/ ---------------------------------------------------------------------- -----BEGIN GEEK CODE BLOCK----- GIT/CS/AT dx(-) s+:(++:) a- C++ UBLVS++++$ P++>+++$ L-(+)$ E--- W+++$ N+(++) o-- K- w--()$ O-(--) M@ V-(--) PS+>++ PE(-) Y+ PGP(-) t+ 5+ X+++(++++) R* tv++ b+(++) DI++ D-(--) G- e h--(*) r++ y? ------END GEEK CODE BLOCK------ --Boundary-00=_MU/U+5seNB+VrtY Content-Type: text/x-csrc; charset="us-ascii"; name="scan_ffs.c" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="scan_ffs.c" /* $OpenBSD: scan_ffs.c,v 1.8 2002/07/03 22:32:33 deraadt Exp $ */ /* * Copyright (c) 1998 Niklas Hallqvist, Tobias Weingartner * 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 Tobias Weingartner. * 4. The name of the author 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 ``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 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. */ #include <sys/types.h> #include <sys/param.h> #include <sys/fcntl.h> #ifdef __FreeBSD__ #include <ufs/ufs/dinode.h> #endif #include <ufs/ffs/fs.h> #include <unistd.h> #include <stdlib.h> #include <stdio.h> #include <string.h> #include <time.h> #include <err.h> #if 0 #include <util.h> #endif #ifdef __FreeBSD__ #define SBSIZE SBLOCKSIZE #endif #define SBCOUNT 64 /* XXX - Should be configurable */ /* Flags to control ourselves... */ #define FLAG_VERBOSE 1 #define FLAG_SMART 2 #define FLAG_LABELS 4 int ufsscan(int fd, daddr_t beg, daddr_t end, int flags) { static char lastmount[MAXMNTLEN]; static u_int8_t buf[SBSIZE * SBCOUNT]; struct fs *sb; daddr_t blk, lastblk; int n; lastblk = -1; memset(lastmount, 0, MAXMNTLEN); for (blk = beg; blk <= ((end<0)?blk:end); blk += (SBCOUNT*SBSIZE/512)){ memset(buf, 0, SBSIZE * SBCOUNT); if (lseek(fd, (off_t)blk * 512, SEEK_SET) < 0) err(1, "lseek"); if (read(fd, buf, SBSIZE * SBCOUNT) < 0) err(1, "read"); for (n = 0; n < (SBSIZE * SBCOUNT); n += 512){ sb = (struct fs*)(&buf[n]); if ((sb->fs_magic == FS_UFS1_MAGIC) || (sb->fs_magic == FS_UFS2_MAGIC)) { if (flags & FLAG_VERBOSE) printf("block %d id %x,%x size %d\n", blk + (n/512), sb->fs_id[0], sb->fs_id[1], sb->fs_size); if (((blk+(n/512)) - lastblk) == (SBSIZE/512)) { if (flags & FLAG_LABELS ) { #ifdef __FreeBSD__ printf("X: %lld %lld 4.2BSD %ld %ld %ld # %s\n", #else printf("X: %d %d 4.2BSD %d %d %d # %s\n", #endif (daddr_t)((off_t)sb->fs_size * sb->fs_fsize / 512), blk+(n/512)-(2*SBSIZE/512), sb->fs_fsize, sb->fs_bsize, sb->fs_old_cpg, lastmount); } else { #ifdef __FreeBSD__ printf("ufs1 at %lld size %lld mount %s time %s\n", #else printf("ffs1 at %d size %lld mount %s time %s\n", #endif blk+(n/512)-(2*SBSIZE/512), (long long)(off_t)sb->fs_size * sb->fs_fsize, lastmount, ctime((time_t *)&sb->fs_time)); } if (flags & FLAG_SMART) { off_t size = (off_t)sb->fs_size * sb->fs_fsize; if ((n + size) < (SBSIZE * SBCOUNT)) n += size; else { blk += (size/512 - (SBCOUNT*SBCOUNT)); break; } } } /* Update last potential FS SBs seen */ lastblk = blk + (n/512); memcpy(lastmount, sb->fs_fsmnt, MAXMNTLEN); } } } return(0); } void usage(int code) { extern char *__progname; fprintf(stderr, "usage: %s [-lsv] [-b begin] [-e end] device\n", __progname); exit(code); } int main(int argc, char *argv[]) { #ifdef __FreeBSD__ char *name; #endif int ch, fd, flags = 0; daddr_t beg = 0, end = -1; while ((ch = getopt(argc, argv, "lsvb:e:")) != -1) switch(ch) { case 'b': beg = atoi(optarg); break; case 'e': end = atoi(optarg); break; case 'v': flags |= FLAG_VERBOSE; break; case 's': flags |= FLAG_SMART; break; case 'l': flags |= FLAG_LABELS; break; default: usage(1); /* NOTREACHED */ } argc -= optind; argv += optind; if (argc != 1) usage(1); #ifdef __FreeBSD__ if (argv[0][0] != '/') { if (asprintf(&name, "/dev/%s", argv[0]) == -1) err(1, "%s", argv[1]); } else name = argv[0]; fd = open(name, O_RDONLY); #else fd = opendev(argv[0], O_RDONLY, OPENDEV_PART, NULL); #endif if (fd < 0) err(1, "%s", argv[1]); #ifdef __FreeBSD__ if (name != argv[0]) free(name); #endif return (ufsscan(fd, beg, end, flags)); } --Boundary-00=_MU/U+5seNB+VrtY-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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