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use physical sector size for partial buffer reads;
[unix-history] / usr / src / sbin / fsck / setup.c
/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#ifndef lint
static char sccsid[] = "@(#)setup.c 5.12 (Berkeley) %G%";
#endif not lint
#define DKTYPENAMES
#include <sys/param.h>
#include <sys/inode.h>
#include <sys/fs.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/disklabel.h>
#include <sys/file.h>
#include <ctype.h>
#include "fsck.h"
#define POWEROF2(num) (((num) & ((num) - 1)) == 0)
char *calloc();
char *index();
setup(dev)
char *dev;
{
dev_t rootdev;
long cg, ncg, size, i, j;
struct stat statb;
struct fs proto;
if (stat("/", &statb) < 0)
errexit("Can't stat root\n");
rootdev = statb.st_dev;
if (stat(dev, &statb) < 0) {
perror(dev);
printf("Can't stat %s\n", dev);
return (0);
}
rawflg = 0;
if ((statb.st_mode & S_IFMT) == S_IFBLK)
;
else if ((statb.st_mode & S_IFMT) == S_IFCHR)
rawflg++;
else {
if (reply("file is not a block or character device; OK") == 0)
return (0);
}
if (rootdev == statb.st_rdev)
hotroot++;
if ((dfile.rfdes = open(dev, O_RDONLY)) < 0) {
perror(dev);
printf("Can't open %s\n", dev);
return (0);
}
if (preen == 0)
printf("** %s", dev);
if (nflag || (dfile.wfdes = open(dev, O_WRONLY)) < 0) {
dfile.wfdes = -1;
if (preen)
pfatal("NO WRITE ACCESS");
printf(" (NO WRITE)");
}
if (preen == 0)
printf("\n");
dfile.mod = 0;
lfdir = 0;
initbarea(&sblk);
initbarea(&fileblk);
initbarea(&inoblk);
initbarea(&cgblk);
/*
* Read in the superblock, looking for alternates if necessary
*/
if (readsb(1) == 0) {
if (bflag || calcsb(dev, dfile.rfdes, &proto) == 0 || preen)
return(0);
if (reply("LOOK FOR ALTERNATE SUPERBLOCKS") == 0)
return (0);
for (cg = 0; cg < proto.fs_ncg; cg++) {
bflag = fsbtodb(&proto, cgsblock(&proto, cg));
if (readsb(0) != 0)
break;
}
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 TO SPECIFY THE",
"LOCATION OF AN ALTERNATE",
"SUPER-BLOCK TO SUPPLY NEEDED",
"INFORMATION; SEE fsck(8).");
return(0);
}
pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
}
fmax = sblock.fs_size;
imax = sblock.fs_ncg * sblock.fs_ipg;
/*
* 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_interleave < 1) {
pwarn("IMPOSSIBLE INTERLEAVE=%d IN SUPERBLOCK",
sblock.fs_interleave);
sblock.fs_interleave = 1;
if (preen)
printf(" (FIXED)\n");
if (preen || reply("SET TO DEFAULT") == 1)
sbdirty();
}
if (sblock.fs_npsect < sblock.fs_nsect) {
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();
}
/*
* read in the summary info.
*/
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;
sblock.fs_csp[j] = (struct csum *)calloc(1, (unsigned)size);
if (bread(&dfile, (char *)sblock.fs_csp[j],
fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
size) != 0)
return (0);
}
/*
* allocate and initialize the necessary maps
*/
bmapsz = roundup(howmany(fmax, NBBY), sizeof(short));
blockmap = calloc((unsigned)bmapsz, sizeof (char));
if (blockmap == NULL) {
printf("cannot alloc %d bytes for blockmap\n", bmapsz);
goto badsb;
}
statemap = calloc((unsigned)(imax + 1), sizeof(char));
if (statemap == NULL) {
printf("cannot alloc %d bytes for statemap\n", imax + 1);
goto badsb;
}
lncntp = (short *)calloc((unsigned)(imax + 1), sizeof(short));
if (lncntp == NULL) {
printf("cannot alloc %d bytes for lncntp\n",
(imax + 1) * sizeof(short));
goto badsb;
}
return (1);
badsb:
ckfini();
return (0);
}
/*
* Read in the super block and its summary info.
*/
readsb(listerr)
int listerr;
{
BUFAREA asblk;
struct disklabel *getdisklabel(), *lp;
# define altsblock asblk.b_un.b_fs
daddr_t super = bflag ? bflag * DEV_BSIZE : SBOFF;
initbarea(&asblk);
dev_bsize = 1;
if (bread(&dfile, (char *)&sblock, 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.fs_magic != FS_MAGIC)
{ badsb(listerr, "MAGIC NUMBER WRONG"); return (0); }
if (sblock.fs_ncg < 1)
{ badsb(listerr, "NCG OUT OF RANGE"); return (0); }
if (sblock.fs_cpg < 1 || sblock.fs_cpg > MAXCPG)
{ badsb(listerr, "CPG OUT OF RANGE"); return (0); }
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, "SIZE PREPOSTEROUSLY LARGE"); return (0); }
/*
* 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.
*/
dev_bsize = sblock.fs_fsize / fsbtodb(&sblock, 1);
if (lp = getdisklabel((char *)NULL, dfile.rfdes))
secsize = lp->d_secsize;
else
secsize = dev_bsize;
sblk.b_bno = sblk.b_bno / dev_bsize;
if (bflag)
return (1);
getblk(&asblk, cgsblock(&sblock, sblock.fs_ncg - 1), sblock.fs_sbsize);
if (asblk.b_errs != NULL)
return (0);
altsblock.fs_fsbtodb = sblock.fs_fsbtodb;
altsblock.fs_link = sblock.fs_link;
altsblock.fs_rlink = sblock.fs_rlink;
altsblock.fs_time = sblock.fs_time;
altsblock.fs_cstotal = sblock.fs_cstotal;
altsblock.fs_cgrotor = sblock.fs_cgrotor;
altsblock.fs_fmod = sblock.fs_fmod;
altsblock.fs_clean = sblock.fs_clean;
altsblock.fs_ronly = sblock.fs_ronly;
altsblock.fs_flags = sblock.fs_flags;
altsblock.fs_maxcontig = sblock.fs_maxcontig;
altsblock.fs_minfree = sblock.fs_minfree;
altsblock.fs_optim = sblock.fs_optim;
altsblock.fs_rotdelay = sblock.fs_rotdelay;
altsblock.fs_maxbpg = sblock.fs_maxbpg;
altsblock.fs_npsect = sblock.fs_npsect;
altsblock.fs_interleave = sblock.fs_interleave;
bcopy((char *)sblock.fs_csp, (char *)altsblock.fs_csp,
sizeof sblock.fs_csp);
bcopy((char *)sblock.fs_fsmnt, (char *)altsblock.fs_fsmnt,
sizeof sblock.fs_fsmnt);
bcopy((char *)sblock.fs_sparecon, (char *)altsblock.fs_sparecon,
sizeof sblock.fs_sparecon);
if (bcmp((char *)&sblock, (char *)&altsblock, (int)sblock.fs_sbsize)) {
badsb(listerr,
"VALUES IN SUPER BLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE");
return (0);
}
return (1);
# undef altsblock
}
badsb(listerr, s)
int listerr;
char *s;
{
if (!listerr)
return;
if (preen)
printf("%s: ", devname);
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!
*/
calcsb(dev, devfd, fs)
char *dev;
int devfd;
register struct fs *fs;
{
register struct disklabel *lp;
register struct partition *pp;
register char *cp;
int i;
cp = index(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 FORMATTED AS A BSD FILE SYSTEM (%s)\n",
dev, pp->p_fstype < FSMAXTYPES ?
fstypenames[pp->p_fstype] : "unknown");
return (0);
}
bzero(fs, sizeof(struct fs));
fs->fs_fsize = pp->p_fsize;
fs->fs_frag = pp->p_frag;
fs->fs_cpg = pp->p_cpg;
fs->fs_size = pp->p_size;
fs->fs_ntrak = lp->d_ntracks;
fs->fs_nsect = lp->d_nsectors;
fs->fs_spc = lp->d_secpercyl;
fs->fs_nspf = fs->fs_fsize / lp->d_secsize;
fs->fs_sblkno = roundup(
howmany(lp->d_bbsize + lp->d_sbsize, fs->fs_fsize),
fs->fs_frag);
fs->fs_cgmask = 0xffffffff;
for (i = fs->fs_ntrak; i > 1; i >>= 1)
fs->fs_cgmask <<= 1;
if (!POWEROF2(fs->fs_ntrak))
fs->fs_cgmask <<= 1;
fs->fs_cgoffset = roundup(
howmany(fs->fs_nsect, NSPF(fs)), fs->fs_frag);
fs->fs_fpg = (fs->fs_cpg * fs->fs_spc) / NSPF(fs);
fs->fs_ncg = howmany(fs->fs_size / fs->fs_spc, fs->fs_cpg);
for (fs->fs_fsbtodb = 0, i = NSPF(fs); i > 1; i >>= 1)
fs->fs_fsbtodb++;
return (1);
}
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("");
perror("ioctl (GDINFO)");
errexit("%s: can't read disk label", s);
}
return (&lab);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.