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f033309fcd
trying to use them. Set a minimum value for numdirs when using an alternate superblock to avoid spurious numdirs == 0 error. Calculate new fields when using an alternate superblock from a UFS1 filesystem to avoid segment faulting. Sponsored by: DARPA & NAI Labs.
503 lines
14 KiB
C
503 lines
14 KiB
C
/*
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* Copyright (c) 1980, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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#if 0
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static const char sccsid[] = "@(#)setup.c 8.10 (Berkeley) 5/9/95";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#define FSTYPENAMES
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#include <sys/disklabel.h>
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#include <sys/file.h>
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#include <sys/sysctl.h>
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#include <ufs/ufs/dinode.h>
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#include <ufs/ffs/fs.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdint.h>
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#include <string.h>
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#include "fsck.h"
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struct bufarea asblk;
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#define altsblock (*asblk.b_un.b_fs)
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#define POWEROF2(num) (((num) & ((num) - 1)) == 0)
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static void badsb(int listerr, const char *s);
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static int calcsb(char *dev, int devfd, struct fs *fs);
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static struct disklabel *getdisklabel(char *s, int fd);
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/*
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* Read in a superblock finding an alternate if necessary.
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* Return 1 if successful, 0 if unsuccessful, -1 if file system
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* is already clean (preen mode only).
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*/
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int
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setup(char *dev)
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{
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long cg, asked, i, j;
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long bmapsize;
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struct stat statb;
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struct fs proto;
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size_t size;
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havesb = 0;
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fswritefd = -1;
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cursnapshot = 0;
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if (stat(dev, &statb) < 0) {
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printf("Can't stat %s: %s\n", dev, strerror(errno));
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if (bkgrdflag) {
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unlink(snapname);
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bkgrdflag = 0;
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}
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return (0);
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}
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if ((statb.st_mode & S_IFMT) != S_IFCHR &&
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(statb.st_mode & S_IFMT) != S_IFBLK) {
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if (bkgrdflag != 0 && (statb.st_flags & SF_SNAPSHOT) == 0) {
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unlink(snapname);
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printf("background fsck lacks a snapshot\n");
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exit(EEXIT);
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}
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if ((statb.st_flags & SF_SNAPSHOT) != 0 && cvtlevel == 0) {
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cursnapshot = statb.st_ino;
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} else {
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if (cvtlevel == 0 ||
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(statb.st_flags & SF_SNAPSHOT) == 0) {
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if (preen && bkgrdflag) {
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unlink(snapname);
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bkgrdflag = 0;
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}
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pfatal("%s is not a disk device", dev);
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if (reply("CONTINUE") == 0) {
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if (bkgrdflag) {
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unlink(snapname);
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bkgrdflag = 0;
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}
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return (0);
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}
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} else {
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if (bkgrdflag) {
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unlink(snapname);
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bkgrdflag = 0;
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}
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pfatal("cannot convert a snapshot");
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exit(EEXIT);
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}
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}
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}
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if ((fsreadfd = open(dev, O_RDONLY)) < 0) {
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if (bkgrdflag) {
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unlink(snapname);
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bkgrdflag = 0;
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}
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printf("Can't open %s: %s\n", dev, strerror(errno));
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return (0);
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}
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if (bkgrdflag) {
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unlink(snapname);
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size = MIBSIZE;
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if (sysctlnametomib("vfs.ffs.adjrefcnt", adjrefcnt, &size) < 0||
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sysctlnametomib("vfs.ffs.adjblkcnt", adjblkcnt, &size) < 0||
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sysctlnametomib("vfs.ffs.freefiles", freefiles, &size) < 0||
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sysctlnametomib("vfs.ffs.freedirs", freedirs, &size) < 0 ||
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sysctlnametomib("vfs.ffs.freeblks", freeblks, &size) < 0) {
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pfatal("kernel lacks background fsck support\n");
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exit(EEXIT);
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}
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cmd.version = FFS_CMD_VERSION;
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cmd.handle = fsreadfd;
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fswritefd = -1;
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}
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if (preen == 0)
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printf("** %s", dev);
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if (bkgrdflag == 0 &&
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(nflag || (fswritefd = open(dev, O_WRONLY)) < 0)) {
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fswritefd = -1;
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if (preen)
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pfatal("NO WRITE ACCESS");
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printf(" (NO WRITE)");
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}
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if (preen == 0)
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printf("\n");
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/*
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* Read in the superblock, looking for alternates if necessary
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*/
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if (readsb(1) == 0) {
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skipclean = 0;
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if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0)
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return(0);
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if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
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return (0);
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for (cg = 0; cg < proto.fs_ncg; cg++) {
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bflag = fsbtodb(&proto, cgsblock(&proto, cg));
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if (readsb(0) != 0)
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break;
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}
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if (cg >= proto.fs_ncg) {
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printf("%s %s\n%s %s\n%s %s\n",
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"SEARCH FOR ALTERNATE SUPER-BLOCK",
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"FAILED. YOU MUST USE THE",
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"-b OPTION TO FSCK TO SPECIFY THE",
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"LOCATION OF AN ALTERNATE",
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"SUPER-BLOCK TO SUPPLY NEEDED",
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"INFORMATION; SEE fsck(8).");
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bflag = 0;
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return(0);
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}
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pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
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bflag = 0;
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}
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if (skipclean && preen && sblock.fs_clean) {
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pwarn("FILESYSTEM CLEAN; SKIPPING CHECKS\n");
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return (-1);
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}
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maxfsblock = sblock.fs_size;
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maxino = sblock.fs_ncg * sblock.fs_ipg;
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/*
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* Check and potentially fix certain fields in the super block.
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*/
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if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) {
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pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK");
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if (reply("SET TO DEFAULT") == 1) {
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sblock.fs_optim = FS_OPTTIME;
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sbdirty();
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}
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}
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if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) {
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pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK",
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sblock.fs_minfree);
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if (reply("SET TO DEFAULT") == 1) {
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sblock.fs_minfree = 10;
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sbdirty();
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}
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}
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if (sblock.fs_magic == FS_UFS1_MAGIC &&
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sblock.fs_old_inodefmt < FS_44INODEFMT) {
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pwarn("Format of file system is too old.\n");
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pwarn("Must update to modern format using a version of fsck\n");
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pfatal("from before 2002 with the command ``fsck -c 2''\n");
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exit(EEXIT);
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}
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if (asblk.b_dirty && !bflag) {
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memmove(&altsblock, &sblock, (size_t)sblock.fs_sbsize);
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flush(fswritefd, &asblk);
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}
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/*
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* read in the summary info.
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*/
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asked = 0;
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sblock.fs_csp = calloc(1, sblock.fs_cssize);
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for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
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size = sblock.fs_cssize - i < sblock.fs_bsize ?
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sblock.fs_cssize - i : sblock.fs_bsize;
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if (bread(fsreadfd, (char *)sblock.fs_csp + i,
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fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
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size) != 0 && !asked) {
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pfatal("BAD SUMMARY INFORMATION");
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if (reply("CONTINUE") == 0) {
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ckfini(0);
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exit(EEXIT);
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}
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asked++;
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}
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}
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/*
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* allocate and initialize the necessary maps
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*/
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bmapsize = roundup(howmany(maxfsblock, CHAR_BIT), sizeof(short));
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blockmap = calloc((unsigned)bmapsize, sizeof (char));
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if (blockmap == NULL) {
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printf("cannot alloc %u bytes for blockmap\n",
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(unsigned)bmapsize);
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goto badsb;
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}
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inostathead = calloc((unsigned)(sblock.fs_ncg),
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sizeof(struct inostatlist));
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if (inostathead == NULL) {
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printf("cannot alloc %u bytes for inostathead\n",
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(unsigned)(sizeof(struct inostatlist) * (sblock.fs_ncg)));
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goto badsb;
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}
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numdirs = MAX(sblock.fs_cstotal.cs_ndir, 128);
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dirhash = numdirs;
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inplast = 0;
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listmax = numdirs + 10;
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inpsort = (struct inoinfo **)calloc((unsigned)listmax,
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sizeof(struct inoinfo *));
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inphead = (struct inoinfo **)calloc((unsigned)numdirs,
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sizeof(struct inoinfo *));
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if (inpsort == NULL || inphead == NULL) {
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printf("cannot alloc %ju bytes for inphead\n",
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(uintmax_t)numdirs * sizeof(struct inoinfo *));
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goto badsb;
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}
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bufinit();
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if (sblock.fs_flags & FS_DOSOFTDEP)
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usedsoftdep = 1;
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else
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usedsoftdep = 0;
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return (1);
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badsb:
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ckfini(0);
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return (0);
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}
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/*
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* Possible superblock locations ordered from most to least likely.
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*/
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static int sblock_try[] = SBLOCKSEARCH;
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/*
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* Read in the super block and its summary info.
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*/
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int
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readsb(int listerr)
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{
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ufs2_daddr_t super;
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int i;
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if (bflag) {
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super = bflag;
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if ((bread(fsreadfd, (char *)&sblock, super, (long)SBLOCKSIZE)))
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return (0);
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if (sblock.fs_magic != FS_UFS1_MAGIC &&
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sblock.fs_magic != FS_UFS2_MAGIC) {
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fprintf(stderr, "%d is not a file system superblock\n",
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bflag);
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return (0);
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}
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} else {
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for (i = 0; sblock_try[i] != -1; i++) {
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super = sblock_try[i] / dev_bsize;
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if ((bread(fsreadfd, (char *)&sblock, super,
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(long)SBLOCKSIZE)))
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return (0);
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if ((sblock.fs_magic == FS_UFS1_MAGIC ||
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(sblock.fs_magic == FS_UFS2_MAGIC &&
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sblock.fs_sblockloc == sblock_try[i])) &&
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sblock.fs_ncg >= 1 &&
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sblock.fs_bsize >= MINBSIZE &&
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sblock.fs_bsize >= sizeof(struct fs))
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break;
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}
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if (sblock_try[i] == -1) {
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fprintf(stderr, "Cannot find file system superblock\n");
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return (0);
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}
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}
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/*
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* Compute block size that the file system is based on,
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* according to fsbtodb, and adjust superblock block number
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* so we can tell if this is an alternate later.
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*/
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super *= dev_bsize;
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dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1);
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sblk.b_bno = super / dev_bsize;
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sblk.b_size = SBLOCKSIZE;
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if (bflag)
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goto out;
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/*
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* Compare all fields that should not differ in alternate super block.
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* When an alternate super-block is specified this check is skipped.
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*/
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getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
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if (asblk.b_errs)
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return (0);
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if (altsblock.fs_sblkno != sblock.fs_sblkno ||
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altsblock.fs_cblkno != sblock.fs_cblkno ||
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altsblock.fs_iblkno != sblock.fs_iblkno ||
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altsblock.fs_dblkno != sblock.fs_dblkno ||
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altsblock.fs_ncg != sblock.fs_ncg ||
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altsblock.fs_bsize != sblock.fs_bsize ||
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altsblock.fs_fsize != sblock.fs_fsize ||
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altsblock.fs_frag != sblock.fs_frag ||
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altsblock.fs_bmask != sblock.fs_bmask ||
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altsblock.fs_fmask != sblock.fs_fmask ||
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altsblock.fs_bshift != sblock.fs_bshift ||
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altsblock.fs_fshift != sblock.fs_fshift ||
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altsblock.fs_fragshift != sblock.fs_fragshift ||
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altsblock.fs_fsbtodb != sblock.fs_fsbtodb ||
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altsblock.fs_sbsize != sblock.fs_sbsize ||
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altsblock.fs_nindir != sblock.fs_nindir ||
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altsblock.fs_inopb != sblock.fs_inopb ||
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altsblock.fs_cssize != sblock.fs_cssize ||
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altsblock.fs_ipg != sblock.fs_ipg ||
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altsblock.fs_fpg != sblock.fs_fpg ||
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altsblock.fs_magic != sblock.fs_magic) {
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badsb(listerr,
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"VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
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return (0);
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}
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out:
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/*
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* If not yet done, update UFS1 superblock with new wider fields.
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*/
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if (sblock.fs_magic == FS_UFS1_MAGIC &&
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sblock.fs_maxbsize != sblock.fs_bsize) {
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sblock.fs_maxbsize = sblock.fs_bsize;
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sblock.fs_time = sblock.fs_old_time;
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sblock.fs_size = sblock.fs_old_size;
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sblock.fs_dsize = sblock.fs_old_dsize;
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sblock.fs_csaddr = sblock.fs_old_csaddr;
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sblock.fs_cstotal.cs_ndir = sblock.fs_old_cstotal.cs_ndir;
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sblock.fs_cstotal.cs_nbfree = sblock.fs_old_cstotal.cs_nbfree;
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sblock.fs_cstotal.cs_nifree = sblock.fs_old_cstotal.cs_nifree;
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sblock.fs_cstotal.cs_nffree = sblock.fs_old_cstotal.cs_nffree;
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}
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havesb = 1;
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return (1);
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}
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static void
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badsb(int listerr, const char *s)
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{
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if (!listerr)
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return;
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if (preen)
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printf("%s: ", cdevname);
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pfatal("BAD SUPER BLOCK: %s\n", s);
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}
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void
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sblock_init(void)
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{
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struct disklabel *lp;
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fswritefd = -1;
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fsmodified = 0;
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lfdir = 0;
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initbarea(&sblk);
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initbarea(&asblk);
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sblk.b_un.b_buf = malloc(SBLOCKSIZE);
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asblk.b_un.b_buf = malloc(SBLOCKSIZE);
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if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL)
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errx(EEXIT, "cannot allocate space for superblock");
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if ((lp = getdisklabel(NULL, fsreadfd)))
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dev_bsize = secsize = lp->d_secsize;
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else
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dev_bsize = secsize = DEV_BSIZE;
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}
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/*
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* Calculate a prototype superblock based on information in the disk label.
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* When done the cgsblock macro can be calculated and the fs_ncg field
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* can be used. Do NOT attempt to use other macros without verifying that
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* their needed information is available!
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*/
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static int
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calcsb(char *dev, int devfd, struct fs *fs)
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{
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struct disklabel *lp;
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struct partition *pp;
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char *cp;
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int i, nspf;
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cp = strchr(dev, '\0') - 1;
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if (cp == (char *)-1 || ((*cp < 'a' || *cp > 'h') && !isdigit(*cp))) {
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pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev);
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return (0);
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}
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lp = getdisklabel(dev, devfd);
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if (isdigit(*cp))
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pp = &lp->d_partitions[0];
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else
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pp = &lp->d_partitions[*cp - 'a'];
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if (pp->p_fstype != FS_BSDFFS) {
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pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n",
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dev, pp->p_fstype < FSMAXTYPES ?
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fstypenames[pp->p_fstype] : "unknown");
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return (0);
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}
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if (pp->p_fsize == 0 || pp->p_frag == 0 ||
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pp->p_cpg == 0 || pp->p_size == 0) {
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pfatal("%s: %s: type %s fsize %d, frag %d, cpg %d, size %d\n",
|
|
dev, "INCOMPLETE LABEL", fstypenames[pp->p_fstype],
|
|
pp->p_fsize, pp->p_frag, pp->p_cpg, pp->p_size);
|
|
return (0);
|
|
}
|
|
memset(fs, 0, sizeof(struct fs));
|
|
fs->fs_fsize = pp->p_fsize;
|
|
fs->fs_frag = pp->p_frag;
|
|
fs->fs_size = pp->p_size;
|
|
fs->fs_sblkno = roundup(
|
|
howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize),
|
|
fs->fs_frag);
|
|
nspf = fs->fs_fsize / lp->d_secsize;
|
|
for (fs->fs_fsbtodb = 0, i = nspf; i > 1; i >>= 1)
|
|
fs->fs_fsbtodb++;
|
|
dev_bsize = lp->d_secsize;
|
|
if (fs->fs_magic == FS_UFS2_MAGIC) {
|
|
fs->fs_fpg = pp->p_cpg;
|
|
fs->fs_ncg = howmany(fs->fs_size, fs->fs_fpg);
|
|
} else /* if (fs->fs_magic == FS_UFS1_MAGIC) */ {
|
|
fs->fs_old_cpg = pp->p_cpg;
|
|
fs->fs_old_cgmask = 0xffffffff;
|
|
for (i = lp->d_ntracks; i > 1; i >>= 1)
|
|
fs->fs_old_cgmask <<= 1;
|
|
if (!POWEROF2(lp->d_ntracks))
|
|
fs->fs_old_cgmask <<= 1;
|
|
fs->fs_old_cgoffset = roundup(howmany(lp->d_nsectors, nspf),
|
|
fs->fs_frag);
|
|
fs->fs_fpg = (fs->fs_old_cpg * lp->d_secpercyl) / nspf;
|
|
fs->fs_ncg = howmany(fs->fs_size / lp->d_secpercyl,
|
|
fs->fs_old_cpg);
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
static struct disklabel *
|
|
getdisklabel(char *s, int fd)
|
|
{
|
|
static struct disklabel lab;
|
|
|
|
if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) {
|
|
if (s == NULL)
|
|
return ((struct disklabel *)NULL);
|
|
pwarn("ioctl (GCINFO): %s\n", strerror(errno));
|
|
errx(EEXIT, "%s: can't read disk label", s);
|
|
}
|
|
return (&lab);
|
|
}
|