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src/sbin/fsck_ffs/setup.c

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/* $OpenBSD: setup.c,v 1.70 2024/02/03 18:51:57 beck Exp $ */
/* $NetBSD: setup.c,v 1.27 1996/09/27 22:45:19 christos Exp $ */
/*
* Copyright (c) 1980, 1986, 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. 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.
*/
#include <sys/param.h> /* MAXBSIZE DEV_BSIZE roundup */
#define DKTYPENAMES
#include <sys/time.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/dkio.h>
#include <sys/disklabel.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <util.h>
#include <limits.h>
#include <ctype.h>
#include <err.h>
#include "fsck.h"
#include "extern.h"
#include "fsutil.h"
#define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b))
#define altsblock (*asblk.b_un.b_fs)
#define POWEROF2(num) (((num) & ((num) - 1)) == 0)
void badsb(int, char *);
int calcsb(char *, int, struct fs *, struct disklabel *, uint32_t);
static struct disklabel *getdisklabel(char *, int);
static int readsb(int);
static int cmpsb(struct fs *, struct fs *);
static char rdevname[PATH_MAX];
long numdirs, listmax, inplast;
/*
* Possible locations for the superblock.
*/
static const int sbtry[] = SBLOCKSEARCH;
/* locations the 1st alternate sb can be at */
static const int altsbtry[] = { 32, 64, 128, 144, 160, 192, 256 };
int
setup(char *dev, int isfsdb)
{
long size, asked, i, j;
size_t bmapsize;
struct disklabel *lp;
off_t sizepb;
struct stat statb;
struct fs proto;
int doskipclean;
int32_t maxsymlinklen, nindir;
uint32_t cg, inopb;
u_int64_t maxfilesize;
char *realdev;
havesb = 0;
fswritefd = fsreadfd = -1;
doskipclean = skipclean;
if ((fsreadfd = opendev(dev, O_RDONLY, 0, &realdev)) == -1) {
printf("Can't open %s: %s\n", dev, strerror(errno));
return (0);
}
if (strncmp(dev, realdev, PATH_MAX) != 0) {
blockcheck(unrawname(realdev));
strlcpy(rdevname, realdev, sizeof(rdevname));
setcdevname(rdevname, dev, preen);
if (isfsdb || !hotroot()) {
if (unveil("/dev", "rw") == -1)
err(1, "unveil /dev");
if (pledge("stdio rpath wpath getpw tty disklabel",
NULL) == -1)
err(1, "pledge");
}
}
if (fstat(fsreadfd, &statb) == -1) {
printf("Can't stat %s: %s\n", realdev, strerror(errno));
close(fsreadfd);
return (0);
}
if (!S_ISCHR(statb.st_mode)) {
pfatal("%s is not a character device", realdev);
if (reply("CONTINUE") == 0) {
close(fsreadfd);
return (0);
}
}
if (preen == 0) {
printf("** %s", realdev);
if (strncmp(dev, realdev, PATH_MAX) != 0)
printf(" (%s)", dev);
}
if (nflag || (fswritefd = opendev(dev, O_WRONLY, 0, NULL)) == -1) {
fswritefd = -1;
if (preen)
pfatal("NO WRITE ACCESS");
printf(" (NO WRITE)");
}
if (preen == 0)
printf("\n");
fsmodified = 0;
lfdir = 0;
initbarea(&sblk);
initbarea(&asblk);
sblk.b_un.b_buf = malloc(SBSIZE);
asblk.b_un.b_buf = malloc(SBSIZE);
if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL)
errexit("cannot allocate space for superblock\n");
if ((lp = getdisklabel(NULL, fsreadfd)) != NULL)
secsize = lp->d_secsize;
else
secsize = DEV_BSIZE;
if (isfsdb) {
if (pledge("stdio rpath getpw tty", NULL) == -1)
err(1, "pledge");
} else if (!hotroot()) {
#ifndef SMALL
if (pledge("stdio getpw", NULL) == -1)
err(1, "pledge");
#else
if (pledge("stdio", NULL) == -1)
err(1, "pledge");
#endif
}
/*
* Read in the superblock, looking for alternates if necessary
*/
if (readsb(1) == 0) {
if (bflag || preen ||
calcsb(realdev, fsreadfd, &proto, lp, SBLOCK_UFS1) == 0)
return(0);
if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
return (0);
for (i = 0; i < sizeof(altsbtry) / sizeof(altsbtry[0]); i++) {
bflag = altsbtry[i];
/* proto partially setup by calcsb */
if (readsb(0) != 0 &&
proto.fs_fsize == sblock.fs_fsize &&
proto.fs_bsize == sblock.fs_bsize)
goto found;
}
for (cg = 0; cg < proto.fs_ncg; cg++) {
bflag = fsbtodb(&proto, cgsblock(&proto, cg));
if (readsb(0) != 0 &&
proto.fs_fsize == sblock.fs_fsize &&
proto.fs_bsize == sblock.fs_bsize)
goto found;
}
calcsb(realdev, fsreadfd, &proto, lp, SBLOCK_UFS2);
for (cg = 0; cg < proto.fs_ncg; cg++) {
bflag = fsbtodb(&proto, cgsblock(&proto, cg));
if (readsb(0) != 0 &&
proto.fs_fsize == sblock.fs_fsize &&
proto.fs_bsize == sblock.fs_bsize)
goto found;
}
if (cg >= proto.fs_ncg) {
printf("%s %s\n%s %s\n%s %s\n",
"SEARCH FOR ALTERNATE SUPER-BLOCK",
"FAILED. YOU MUST USE THE",
"-b OPTION TO FSCK_FFS TO SPECIFY THE",
"LOCATION OF AN ALTERNATE",
"SUPER-BLOCK TO SUPPLY NEEDED",
"INFORMATION; SEE fsck_ffs(8).");
return(0);
}
found:
doskipclean = 0;
pwarn("USING ALTERNATE SUPERBLOCK AT %lld\n", (long long)bflag);
}
if (debug)
printf("clean = %d\n", sblock.fs_clean);
if (sblock.fs_clean & FS_ISCLEAN) {
if (doskipclean) {
pwarn("%sile system is clean; not checking\n",
preen ? "f" : "** F");
return (-1);
}
if (!preen)
pwarn("** File system is already clean\n");
}
maxfsblock = sblock.fs_size;
maxino = sblock.fs_ncg * sblock.fs_ipg;
sizepb = sblock.fs_bsize;
maxfilesize = sblock.fs_bsize * NDADDR - 1;
for (i = 0; i < NIADDR; i++) {
sizepb *= NINDIR(&sblock);
maxfilesize += sizepb;
}
/*
* Check and potentially fix certain fields in the super block.
*/
if (sblock.fs_optim != FS_OPTTIME && sblock.fs_optim != FS_OPTSPACE) {
pfatal("UNDEFINED OPTIMIZATION IN SUPERBLOCK");
if (reply("SET TO DEFAULT") == 1) {
sblock.fs_optim = FS_OPTTIME;
sbdirty();
}
}
if ((sblock.fs_minfree < 0 || sblock.fs_minfree > 99)) {
pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK",
sblock.fs_minfree);
if (reply("SET TO DEFAULT") == 1) {
sblock.fs_minfree = 10;
sbdirty();
}
}
if (sblock.fs_npsect < sblock.fs_nsect ||
sblock.fs_npsect > sblock.fs_nsect*2) {
pwarn("IMPOSSIBLE NPSECT=%d IN SUPERBLOCK",
sblock.fs_npsect);
sblock.fs_npsect = sblock.fs_nsect;
if (preen)
printf(" (FIXED)\n");
if (preen || reply("SET TO DEFAULT") == 1) {
sbdirty();
dirty(&asblk);
}
}
if (sblock.fs_bmask != ~(sblock.fs_bsize - 1)) {
pwarn("INCORRECT BMASK=%x IN SUPERBLOCK",
sblock.fs_bmask);
sblock.fs_bmask = ~(sblock.fs_bsize - 1);
if (preen)
printf(" (FIXED)\n");
if (preen || reply("FIX") == 1) {
sbdirty();
dirty(&asblk);
}
}
if (sblock.fs_fmask != ~(sblock.fs_fsize - 1)) {
pwarn("INCORRECT FMASK=%x IN SUPERBLOCK",
sblock.fs_fmask);
sblock.fs_fmask = ~(sblock.fs_fsize - 1);
if (preen)
printf(" (FIXED)\n");
if (preen || reply("FIX") == 1) {
sbdirty();
dirty(&asblk);
}
}
if (1 << sblock.fs_bshift != sblock.fs_bsize) {
pwarn("INCORRECT BSHIFT=%d IN SUPERBLOCK", sblock.fs_bshift);
sblock.fs_bshift = ffs(sblock.fs_bsize) - 1;
if (preen)
printf(" (FIXED)\n");
if (preen || reply("FIX") == 1) {
sbdirty();
dirty(&asblk);
}
}
if (1 << sblock.fs_fshift != sblock.fs_fsize) {
pwarn("INCORRECT FSHIFT=%d IN SUPERBLOCK", sblock.fs_fshift);
sblock.fs_fshift = ffs(sblock.fs_fsize) - 1;
if (preen)
printf(" (FIXED)\n");
if (preen || reply("FIX") == 1) {
sbdirty();
dirty(&asblk);
}
}
if (sblock.fs_inodefmt < FS_44INODEFMT) {
pwarn("Format of filesystem is too old.\n");
pwarn("Must update to modern format using a version of fsck\n");
pfatal("from before release 5.0 with the command ``fsck -c 2''\n");
exit(8);
}
if (sblock.fs_maxfilesize != maxfilesize) {
pwarn("INCORRECT MAXFILESIZE=%llu IN SUPERBLOCK",
(unsigned long long)sblock.fs_maxfilesize);
sblock.fs_maxfilesize = maxfilesize;
if (preen)
printf(" (FIXED)\n");
if (preen || reply("FIX") == 1) {
sbdirty();
dirty(&asblk);
}
}
maxsymlinklen = sblock.fs_magic == FS_UFS1_MAGIC ?
MAXSYMLINKLEN_UFS1 : MAXSYMLINKLEN_UFS2;
if (sblock.fs_maxsymlinklen != maxsymlinklen) {
pwarn("INCORRECT MAXSYMLINKLEN=%d IN SUPERBLOCK",
sblock.fs_maxsymlinklen);
sblock.fs_maxsymlinklen = maxsymlinklen;
if (preen)
printf(" (FIXED)\n");
if (preen || reply("FIX") == 1) {
sbdirty();
dirty(&asblk);
}
}
if (sblock.fs_qbmask != ~sblock.fs_bmask) {
pwarn("INCORRECT QBMASK=%lx IN SUPERBLOCK",
(unsigned long)sblock.fs_qbmask);
sblock.fs_qbmask = ~sblock.fs_bmask;
if (preen)
printf(" (FIXED)\n");
if (preen || reply("FIX") == 1) {
sbdirty();
dirty(&asblk);
}
}
if (sblock.fs_qfmask != ~sblock.fs_fmask) {
pwarn("INCORRECT QFMASK=%lx IN SUPERBLOCK",
(unsigned long)sblock.fs_qfmask);
sblock.fs_qfmask = ~sblock.fs_fmask;
if (preen)
printf(" (FIXED)\n");
if (preen || reply("FIX") == 1) {
sbdirty();
dirty(&asblk);
}
}
if (sblock.fs_cgsize != fragroundup(&sblock, CGSIZE(&sblock))) {
pwarn("INCONSISTENT CGSIZE=%d\n", sblock.fs_cgsize);
sblock.fs_cgsize = fragroundup(&sblock, CGSIZE(&sblock));
if (preen)
printf(" (FIXED)\n");
if (preen || reply("FIX") == 1) {
sbdirty();
dirty(&asblk);
}
}
if (sblock.fs_magic == FS_UFS2_MAGIC)
inopb = sblock.fs_bsize / sizeof(struct ufs2_dinode);
else
inopb = sblock.fs_bsize / sizeof(struct ufs1_dinode);
if (INOPB(&sblock) != inopb) {
pwarn("INCONSISTENT INOPB=%u\n", INOPB(&sblock));
sblock.fs_inopb = inopb;
if (preen)
printf(" (FIXED)\n");
if (preen || reply("FIX") == 1) {
sbdirty();
dirty(&asblk);
}
}
if (sblock.fs_magic == FS_UFS2_MAGIC)
nindir = sblock.fs_bsize / sizeof(int64_t);
else
nindir = sblock.fs_bsize / sizeof(int32_t);
if (NINDIR(&sblock) != nindir) {
pwarn("INCONSISTENT NINDIR=%d\n", NINDIR(&sblock));
sblock.fs_nindir = nindir;
if (preen)
printf(" (FIXED)\n");
if (preen || reply("FIX") == 1) {
sbdirty();
dirty(&asblk);
}
}
if (asblk.b_dirty && !bflag) {
memcpy(&altsblock, &sblock, (size_t)sblock.fs_sbsize);
flush(fswritefd, &asblk);
}
/*
* read in the summary info.
*/
asked = 0;
sblock.fs_csp = calloc(1, sblock.fs_cssize);
if (sblock.fs_csp == NULL) {
printf("cannot alloc %u bytes for cylinder group summary area\n",
(unsigned)sblock.fs_cssize);
goto badsblabel;
}
for (i = 0, j = 0; i < sblock.fs_cssize; i += sblock.fs_bsize, j++) {
size = sblock.fs_cssize - i < sblock.fs_bsize ?
sblock.fs_cssize - i : sblock.fs_bsize;
if (bread(fsreadfd, (char *)sblock.fs_csp + i,
fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
size) != 0 && !asked) {
pfatal("BAD SUMMARY INFORMATION");
if (reply("CONTINUE") == 0) {
ckfini(0);
errexit("%s", "");
}
asked++;
}
}
/*
* allocate and initialize the necessary maps
*/
bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t));
blockmap = calloc(bmapsize, sizeof(char));
if (blockmap == NULL) {
printf("cannot alloc %zu bytes for blockmap\n", bmapsize);
goto badsblabel;
}
inostathead = calloc((unsigned)(sblock.fs_ncg),
sizeof(struct inostatlist));
if (inostathead == NULL) {
printf("cannot alloc %zu bytes for inostathead\n",
(unsigned)sblock.fs_ncg * sizeof(struct inostatlist));
goto badsblabel;
}
numdirs = MAXIMUM(sblock.fs_cstotal.cs_ndir, 128);
inplast = 0;
listmax = numdirs + 10;
inpsort = calloc((unsigned)listmax, sizeof(struct inoinfo *));
if (inpsort == NULL) {
printf("cannot alloc %zu bytes for inpsort\n",
(unsigned)listmax * sizeof(struct inoinfo *));
goto badsblabel;
}
inphead = calloc((unsigned)numdirs, sizeof(struct inoinfo *));
if (inphead == NULL) {
printf("cannot alloc %zu bytes for inphead\n",
(unsigned)numdirs * sizeof(struct inoinfo *));
goto badsblabel;
}
bufinit();
return (1);
badsblabel:
ckfini(0);
return (0);
}
/*
* Read in the super block and its summary info.
*/
static int
readsb(int listerr)
{
daddr_t super = 0;
int i;
if (bflag) {
super = bflag;
if (bread(fsreadfd, (char *)&sblock, super, (long)SBSIZE) != 0)
return (0);
if (sblock.fs_magic != FS_UFS1_MAGIC &&
sblock.fs_magic != FS_UFS2_MAGIC) {
badsb(listerr, "MAGIC NUMBER WRONG");
return (0);
}
} else {
for (i = 0; sbtry[i] != -1; i++) {
super = sbtry[i] / DEV_BSIZE;
if (bread(fsreadfd, (char *)&sblock, super,
(long)SBSIZE) != 0)
return (0);
if (sblock.fs_magic != FS_UFS1_MAGIC &&
sblock.fs_magic != FS_UFS2_MAGIC)
continue; /* Not a superblock */
/*
* Do not look for an FFS1 file system at SBLOCK_UFS2.
* Doing so will find the wrong super-block for file
* systems with 64k block size.
*/
if (sblock.fs_magic == FS_UFS1_MAGIC &&
sbtry[i] == SBLOCK_UFS2)
continue;
if (sblock.fs_magic == FS_UFS2_MAGIC &&
sblock.fs_sblockloc != sbtry[i])
continue; /* Not a superblock */
break;
}
if (sbtry[i] == -1) {
badsb(listerr, "MAGIC NUMBER WRONG");
return (0);
}
}
sblk.b_bno = super;
sblk.b_size = SBSIZE;
/*
* run a few consistency checks of the super block
*/
if (sblock.fs_ncg < 1) {
badsb(listerr, "NCG OUT OF RANGE");
return (0);
}
if (sblock.fs_cpg < 1) {
badsb(listerr, "CPG OUT OF RANGE");
return (0);
}
if (sblock.fs_magic == FS_UFS1_MAGIC) {
if (sblock.fs_ncg * sblock.fs_cpg < sblock.fs_ncyl ||
(sblock.fs_ncg - 1) * sblock.fs_cpg >= sblock.fs_ncyl) {
badsb(listerr, "NCYL LESS THAN NCG*CPG");
return (0);
}
}
if (sblock.fs_sbsize > SBSIZE) {
badsb(listerr, "SBSIZE PREPOSTEROUSLY LARGE");
return (0);
}
if (!POWEROF2(sblock.fs_bsize) || sblock.fs_bsize < MINBSIZE ||
sblock.fs_bsize > MAXBSIZE) {
badsb(listerr, "ILLEGAL BLOCK SIZE IN SUPERBLOCK");
return (0);
}
if (!POWEROF2(sblock.fs_fsize) || sblock.fs_fsize > sblock.fs_bsize ||
sblock.fs_fsize < sblock.fs_bsize / MAXFRAG) {
badsb(listerr, "ILLEGAL FRAGMENT SIZE IN SUPERBLOCK");
return (0);
}
if (bflag)
goto out;
getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
if (asblk.b_errs)
return (0);
if (cmpsb(&sblock, &altsblock)) {
if (debug) {
long *nlp, *olp, *endlp;
printf("superblock mismatches\n");
nlp = (long *)&altsblock;
olp = (long *)&sblock;
endlp = olp + (sblock.fs_sbsize / sizeof *olp);
for ( ; olp < endlp; olp++, nlp++) {
if (*olp == *nlp)
continue;
printf("offset %d, original %ld, alternate %ld\n",
(int)(olp - (long *)&sblock), *olp, *nlp);
}
}
badsb(listerr,
"VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN LAST ALTERNATE");
return (0);
}
out:
if (sblock.fs_magic == FS_UFS1_MAGIC) {
sblock.fs_time = sblock.fs_ffs1_time;
sblock.fs_size = sblock.fs_ffs1_size;
sblock.fs_dsize = sblock.fs_ffs1_dsize;
sblock.fs_csaddr = sblock.fs_ffs1_csaddr;
sblock.fs_cstotal.cs_ndir = sblock.fs_ffs1_cstotal.cs_ndir;
sblock.fs_cstotal.cs_nbfree = sblock.fs_ffs1_cstotal.cs_nbfree;
sblock.fs_cstotal.cs_nifree = sblock.fs_ffs1_cstotal.cs_nifree;
sblock.fs_cstotal.cs_nffree = sblock.fs_ffs1_cstotal.cs_nffree;
}
havesb = 1;
return (1);
}
void
badsb(int listerr, char *s)
{
if (!listerr)
return;
if (preen)
printf("%s: ", cdevname());
pfatal("BAD SUPER BLOCK: %s\n", s);
}
/*
* Calculate a prototype superblock based on information in the disk label.
* When done the cgsblock macro can be calculated and the fs_ncg field
* can be used. Do NOT attempt to use other macros without verifying that
* their needed information is available!
*/
int
calcsb(char *dev, int devfd, struct fs *fs, struct disklabel *lp,
uint32_t sblockloc)
{
struct partition *pp;
char *cp;
int i;
cp = strchr(dev, '\0');
if ((cp == NULL || (cp[-1] < 'a' || cp[-1] >= 'a' + MAXPARTITIONS)) &&
!isdigit((unsigned char)cp[-1])) {
pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev);
return (0);
}
cp--;
if (lp == NULL)
pfatal("%s: CANNOT READ DISKLABEL\n", dev);
if (isdigit((unsigned char)*cp))
pp = &lp->d_partitions[0];
else
pp = &lp->d_partitions[*cp - 'a'];
if (pp->p_fstype != FS_BSDFFS) {
pfatal("%s: NOT LABELED AS A BSD FILE SYSTEM (%s)\n",
dev, pp->p_fstype < FSMAXTYPES ?
fstypenames[pp->p_fstype] : "unknown");
return (0);
}
memset(fs, 0, sizeof(struct fs));
fs->fs_fsize = DISKLABELV1_FFS_FSIZE(pp->p_fragblock);
fs->fs_frag = DISKLABELV1_FFS_FRAG(pp->p_fragblock);
fs->fs_fpg = pp->p_cpg * fs->fs_frag;
fs->fs_bsize = fs->fs_fsize * fs->fs_frag;
fs->fs_nspf = DL_SECTOBLK(lp, fs->fs_fsize / lp->d_secsize);
for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1)
fs->fs_fsbtodb++;
/*
* fs->fs_size is in fragments, DL_GETPSIZE() is in disk sectors
* and fs_nspf is in DEV_BSIZE blocks. Shake well.
*/
fs->fs_size = DL_SECTOBLK(lp, DL_GETPSIZE(pp)) / fs->fs_nspf;
fs->fs_ncg = howmany(fs->fs_size, fs->fs_fpg);
fs->fs_sblkno = roundup(
howmany(sblockloc + SBSIZE, fs->fs_fsize),
fs->fs_frag);
return (1);
}
static struct disklabel *
getdisklabel(char *s, int fd)
{
static struct disklabel lab;
if (ioctl(fd, DIOCGDINFO, (char *)&lab) == -1) {
if (s == NULL)
return (NULL);
pwarn("ioctl (GCINFO): %s\n", strerror(errno));
errexit("%s: can't read disk label\n", s);
}
return (&lab);
}
/*
* Compare two superblocks
*/
static int
cmpsb(struct fs *sb, struct fs *asb)
{
/*
* Only compare fields which should be the same, and ignore ones
* likely to change to ensure future compatibility.
*/
if (asb->fs_sblkno != sb->fs_sblkno ||
asb->fs_cblkno != sb->fs_cblkno ||
asb->fs_iblkno != sb->fs_iblkno ||
asb->fs_dblkno != sb->fs_dblkno ||
asb->fs_cgoffset != sb->fs_cgoffset ||
asb->fs_cgmask != sb->fs_cgmask ||
asb->fs_ncg != sb->fs_ncg ||
asb->fs_bsize != sb->fs_bsize ||
asb->fs_fsize != sb->fs_fsize ||
asb->fs_frag != sb->fs_frag ||
asb->fs_bmask != sb->fs_bmask ||
asb->fs_fmask != sb->fs_fmask ||
asb->fs_bshift != sb->fs_bshift ||
asb->fs_fshift != sb->fs_fshift ||
asb->fs_fragshift != sb->fs_fragshift ||
asb->fs_fsbtodb != sb->fs_fsbtodb ||
asb->fs_sbsize != sb->fs_sbsize ||
asb->fs_nindir != sb->fs_nindir ||
asb->fs_inopb != sb->fs_inopb ||
asb->fs_cssize != sb->fs_cssize ||
asb->fs_cpg != sb->fs_cpg ||
asb->fs_ipg != sb->fs_ipg ||
asb->fs_fpg != sb->fs_fpg ||
asb->fs_magic != sb->fs_magic)
return (1);
/* they're the same */
return (0);
}
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