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NetBSD/sbin/fsck_ext2fs/setup.c

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/* $NetBSD: setup.c,v 1.2 1997/06/16 08:14:38 bouyer Exp $ */
/*
* Copyright (c) 1997 Manuel Bouyer.
* 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. 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
#if 0
static char sccsid[] = "@(#)setup.c 8.5 (Berkeley) 11/23/94";
#else
static char rcsid[] = "$NetBSD: setup.c,v 1.2 1997/06/16 08:14:38 bouyer Exp $";
#endif
#endif /* not lint */
#define DKTYPENAMES
#include <sys/param.h>
#include <sys/time.h>
#include <ufs/ext2fs/ext2fs_dinode.h>
#include <ufs/ext2fs/ext2fs.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/disklabel.h>
#include <sys/file.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "fsck.h"
#include "extern.h"
#include "fsutil.h"
struct bufarea asblk;
#define altsblock (*asblk.b_un.b_fs)
#define POWEROF2(num) (((num) & ((num) - 1)) == 0)
void badsb __P((int, char *));
/* int calcsb __P((char *, int, struct m_ext2fs *)); */
static struct disklabel *getdisklabel __P((char *, int));
static int readsb __P((int));
int
setup(dev)
char *dev;
{
long cg, size, asked, i, j;
long bmapsize;
struct disklabel *lp;
off_t sizepb;
struct stat statb;
struct m_ext2fs proto;
int doskipclean;
u_int64_t maxfilesize;
havesb = 0;
fswritefd = -1;
doskipclean = skipclean;
if (stat(dev, &statb) < 0) {
printf("Can't stat %s: %s\n", dev, strerror(errno));
return (0);
}
if (!S_ISCHR(statb.st_mode)) {
pfatal("%s is not a character device", dev);
if (reply("CONTINUE") == 0)
return (0);
}
if ((fsreadfd = open(dev, O_RDONLY)) < 0) {
printf("Can't open %s: %s\n", dev, strerror(errno));
return (0);
}
if (preen == 0)
printf("** %s", dev);
if (nflag || (fswritefd = open(dev, O_WRONLY)) < 0) {
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(sizeof(struct m_ext2fs));
asblk.b_un.b_buf = malloc(sizeof(struct m_ext2fs));
if (sblk.b_un.b_buf == NULL || asblk.b_un.b_buf == NULL)
errexit("cannot allocate space for superblock\n");
if ((lp = getdisklabel((char *)NULL, fsreadfd)) != NULL)
dev_bsize = secsize = lp->d_secsize;
else
dev_bsize = secsize = DEV_BSIZE;
/*
* Read in the superblock, looking for alternates if necessary
*/
if (readsb(1) == 0) {
if (bflag || preen || calcsb(dev, fsreadfd, &proto) == 0)
return(0);
if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
return (0);
for (cg = 1; cg < proto.e2fs_ncg; cg++) {
bflag = fsbtodb(&proto,
cg * proto.e2fs.e2fs_bpg + proto.e2fs.e2fs_first_dblock);
if (readsb(0) != 0)
break;
}
if (cg >= proto.e2fs_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_ext2fs(8).");
return(0);
}
doskipclean = 0;
pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
}
if (debug)
printf("state = %d\n", sblock.e2fs.e2fs_state);
if (sblock.e2fs.e2fs_state == E2FS_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.e2fs.e2fs_bcount;
maxino = sblock.e2fs_ncg * sblock.e2fs.e2fs_ipg;
sizepb = sblock.e2fs_bsize;
maxfilesize = sblock.e2fs_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.e2fs.e2fs_rbcount < 0) ||
(sblock.e2fs.e2fs_rbcount > sblock.e2fs.e2fs_bcount)) {
pfatal("IMPOSSIBLE RESERVED BLOCK COUNT=%d IN SUPERBLOCK",
sblock.e2fs.e2fs_rbcount);
if (reply("SET TO DEFAULT") == 1) {
sblock.e2fs.e2fs_rbcount = sblock.e2fs.e2fs_bcount * 0.1;
sbdirty();
}
}
if (sblock.e2fs.e2fs_bpg != sblock.e2fs.e2fs_fpg) {
pfatal("WRONG FPG=%d (BPG=%d) IN SUPERBLOCK",
sblock.e2fs.e2fs_fpg, sblock.e2fs.e2fs_bpg);
return 0;
}
if (asblk.b_dirty && !bflag) {
memcpy(&altsblock, &sblock, (size_t)SBSIZE);
flush(fswritefd, &asblk);
}
/*
* read in the summary info.
*/
sblock.e2fs_gd = malloc(sblock.e2fs_ngdb * sblock.e2fs_bsize);
asked = 0;
for (i=0; i < sblock.e2fs_ngdb; i++) {
if (bread(fsreadfd,(char *)
&sblock.e2fs_gd[i* sblock.e2fs_bsize / sizeof(struct ext2_gd)],
fsbtodb(&sblock, ((sblock.e2fs_bsize>1024)?0:1)+i+1),
sblock.e2fs_bsize) != 0 && !asked) {
pfatal("BAD SUMMARY INFORMATION");
if (reply("CONTINUE") == 0)
errexit("%s\n", "");
asked++;
}
}
/*
* allocate and initialize the necessary maps
*/
bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t));
blockmap = calloc((unsigned)bmapsize, sizeof (char));
if (blockmap == NULL) {
printf("cannot alloc %u bytes for blockmap\n",
(unsigned)bmapsize);
goto badsblabel;
}
statemap = calloc((unsigned)(maxino + 2), sizeof(char));
if (statemap == NULL) {
printf("cannot alloc %u bytes for statemap\n",
(unsigned)(maxino + 1));
goto badsblabel;
}
lncntp = (int16_t *)calloc((unsigned)(maxino + 1), sizeof(int16_t));
if (lncntp == NULL) {
printf("cannot alloc %u bytes for lncntp\n",
(unsigned)(maxino + 1) * sizeof(int16_t));
goto badsblabel;
}
for (numdirs = 0, cg = 0; cg < sblock.e2fs_ncg; cg++) {
numdirs += sblock.e2fs_gd[cg].ext2bgd_ndirs;
}
inplast = 0;
listmax = numdirs + 10;
inpsort = (struct inoinfo **)calloc((unsigned)listmax,
sizeof(struct inoinfo *));
inphead = (struct inoinfo **)calloc((unsigned)numdirs,
sizeof(struct inoinfo *));
if (inpsort == NULL || inphead == NULL) {
printf("cannot alloc %u 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(listerr)
int listerr;
{
daddr_t super = bflag ? bflag : SBOFF / dev_bsize;
if (bread(fsreadfd, (char *)&sblock.e2fs, super, (long)SBSIZE) != 0)
return (0);
sblk.b_bno = super;
sblk.b_size = SBSIZE;
/*
* run a few consistency checks of the super block
*/
if (sblock.e2fs.e2fs_magic != E2FS_MAGIC) {
badsb(listerr, "MAGIC NUMBER WRONG"); return (0);
}
if (sblock.e2fs.e2fs_log_bsize > 2) {
badsb(listerr, "BAD LOG_BSIZE"); return (0);
}
/* compute the dynamic fields of the in-memory sb */
/* compute dynamic sb infos */
sblock.e2fs_ncg =
howmany(sblock.e2fs.e2fs_bcount - sblock.e2fs.e2fs_first_dblock,
sblock.e2fs.e2fs_bpg);
/* XXX assume hw bsize = 512 */
sblock.e2fs_fsbtodb = sblock.e2fs.e2fs_log_bsize + 1;
sblock.e2fs_bsize = 1024 << sblock.e2fs.e2fs_log_bsize;
sblock.e2fs_bshift = LOG_MINBSIZE + sblock.e2fs.e2fs_log_bsize;
sblock.e2fs_qbmask = sblock.e2fs_bsize - 1;
sblock.e2fs_bmask = ~sblock.e2fs_qbmask;
sblock.e2fs_ngdb = howmany(sblock.e2fs_ncg,
sblock.e2fs_bsize / sizeof(struct ext2_gd));
sblock.e2fs_ipb = sblock.e2fs_bsize / sizeof(struct ext2fs_dinode);
sblock.e2fs_itpg = sblock.e2fs.e2fs_ipg/sblock.e2fs_ipb;
cgoverhead = 1 /* super block */ +
sblock.e2fs_ngdb +
1 /* block bitmap */ +
1 /* inode bitmap */ +
sblock.e2fs_itpg;
if (debug) /* DDD */
printf("cg overhead %d blocks \n", cgoverhead);
/*
* Compute block size that the filesystem is based on,
* according to fsbtodb, and adjust superblock block number
* so we can tell if this is an alternate later.
*/
super *= dev_bsize;
dev_bsize = sblock.e2fs_bsize / fsbtodb(&sblock, 1);
sblk.b_bno = super / dev_bsize;
if (bflag) {
havesb = 1;
return (1);
}
/*
* Set all possible fields that could differ, then do check
* of whole super block against an alternate super block.
* When an alternate super-block is specified this check is skipped.
*/
getblk(&asblk, 1 * sblock.e2fs.e2fs_bpg + sblock.e2fs.e2fs_first_dblock,
(long)SBSIZE);
if (asblk.b_errs)
return (0);
altsblock.e2fs.e2fs_rbcount = sblock.e2fs.e2fs_rbcount;
altsblock.e2fs.e2fs_fbcount = sblock.e2fs.e2fs_fbcount;
altsblock.e2fs.e2fs_ficount = sblock.e2fs.e2fs_ficount;
altsblock.e2fs.e2fs_mtime = sblock.e2fs.e2fs_mtime;
altsblock.e2fs.e2fs_wtime = sblock.e2fs.e2fs_wtime;
altsblock.e2fs.e2fs_mnt_count = sblock.e2fs.e2fs_mnt_count;
altsblock.e2fs.e2fs_max_mnt_count = sblock.e2fs.e2fs_max_mnt_count;
altsblock.e2fs.e2fs_state = sblock.e2fs.e2fs_state;
altsblock.e2fs.e2fs_beh = sblock.e2fs.e2fs_beh;
altsblock.e2fs.e2fs_lastfsck = sblock.e2fs.e2fs_lastfsck;
altsblock.e2fs.e2fs_fsckintv = sblock.e2fs.e2fs_fsckintv;
altsblock.e2fs.e2fs_ruid = sblock.e2fs.e2fs_ruid;
altsblock.e2fs.e2fs_rgid = sblock.e2fs.e2fs_rgid;
if (memcmp(&(sblock.e2fs), &(altsblock.e2fs), (int)SBSIZE)) {
if (debug) {
long *nlp, *olp, *endlp;
printf("superblock mismatches\n");
nlp = (long *)&altsblock;
olp = (long *)&sblock;
endlp = olp + (SBSIZE / sizeof *olp);
for ( ; olp < endlp; olp++, nlp++) {
if (*olp == *nlp)
continue;
printf("offset %d, original %ld, alternate %ld\n",
olp - (long *)&sblock, *olp, *nlp);
}
}
badsb(listerr,
"VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
return (0);
}
havesb = 1;
return (1);
}
void
badsb(listerr, s)
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(dev, devfd, fs)
char *dev;
int devfd;
register struct m_ext2fs *fs;
{
register struct disklabel *lp;
register struct partition *pp;
register char *cp;
int i;
cp = strchr(dev, '\0') - 1;
if ((cp == (char *)-1 || (*cp < 'a' || *cp > 'h')) && !isdigit(*cp)) {
pfatal("%s: CANNOT FIGURE OUT FILE SYSTEM PARTITION\n", dev);
return (0);
}
lp = getdisklabel(dev, devfd);
if (isdigit(*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 m_ext2fs));
fs->e2fs_bsize = 1024; /* XXX to look for altenate SP */
fs->e2fs.e2fs_log_bsize = 0;
fs->e2fs.e2fs_bcount = (pp->p_size * DEV_BSIZE) / fs->e2fs_bsize;
fs->e2fs.e2fs_first_dblock = 1;
fs->e2fs.e2fs_bpg = fs->e2fs_bsize * NBBY;
fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize;
fs->e2fs_qbmask = fs->e2fs_bsize - 1;
fs->e2fs_bmask = ~fs->e2fs_qbmask;
fs->e2fs_ncg =
howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock,
fs->e2fs.e2fs_bpg);
fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1;
fs->e2fs_ngdb = howmany(fs->e2fs_ncg,
fs->e2fs_bsize / sizeof(struct ext2_gd));
return (1);
}
static struct disklabel *
getdisklabel(s, fd)
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));
errexit("%s: can't read disk label\n", s);
}
return (&lab);
}
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