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NetBSD/sbin/fsck_lfs/setup.c
perseant 4e3fced95b Merge the short-lived perseant-lfsv2 branch into the trunk. 
Kernels and tools understand both v1 and v2 filesystems; newfs_lfs
generates v2 by default.  Changes for the v2 layout include:

- Segments of non-PO2 size and arbitrary block offset, so these can be
  matched to convenient physical characteristics of the partition (e.g.,
  stripe or track size and offset).

- Address by fragment instead of by disk sector, paving the way for
  non-512-byte-sector devices.  In theory fragments can be as large
  as you like, though in reality they must be smaller than MAXBSIZE in size.

- Use serial number and filesystem identifier to ensure that roll-forward
  doesn't get old data and think it's new.  Roll-forward is enabled for
  v2 filesystems, though not for v1 filesystems by default.

- The inode free list is now a tailq, paving the way for undelete (undelete
  is not yet implemented, but can be without further non-backwards-compatible
  changes to disk structures).

- Inode atime information is kept in the Ifile, instead of on the inode;
  that is, the inode is never written *just* because atime was changed.
  Because of this the inodes remain near the file data on the disk, rather
  than wandering all over as the disk is read repeatedly.  This speeds up
  repeated reads by a small but noticeable amount.

Other changes of note include:

- The ifile written by newfs_lfs can now be of arbitrary length, it is no
  longer restricted to a single indirect block.

- Fixed an old bug where ctime was changed every time a vnode was created.
  I need to look more closely to make sure that the times are only updated
  during write(2) and friends, not after-the-fact during a segment write,
  and certainly not by the cleaner.
2001-07-13 20:30:18 +00:00

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/* $NetBSD: setup.c,v 1.9 2001/07/13 20:30:19 perseant 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. 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.
*/
/* #define DKTYPENAMES */
#define FSTYPENAMES
#include <sys/param.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/disklabel.h>
#include <sys/file.h>
#include <ufs/ufs/dinode.h>
#include <sys/mount.h> /* XXX ufs/lfs/lfs.h should include this for
* us */
#include <ufs/lfs/lfs.h>
#include <ufs/lfs/lfs_extern.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "fsck.h"
#include "extern.h"
#include "fsutil.h"
struct bufarea asblk;
daddr_t *din_table;
SEGUSE *seg_table;
#define altsblock (*asblk.b_un.b_fs)
#define POWEROF2(num) (((num) & ((num) - 1)) == 0)
void badsb(int, char *);
int calcsb(const char *, int, struct lfs *);
static struct disklabel *getdisklabel(const char *, int);
static int readsb(int);
int lfs_maxino(void);
static daddr_t try_verify(struct lfs *, struct lfs *);
#ifdef DKTYPENAMES
int useless(void);
int
useless(void)
{
char **foo = (char **)dktypenames;
char **bar = (char **)fscknames;
return foo - bar;
}
#endif
static daddr_t
try_verify(struct lfs * osb, struct lfs * nsb)
{
daddr_t daddr;
SEGSUM *sp;
char *summary;
int bc, flag;
daddr = osb->lfs_offset;
summary = malloc(osb->lfs_sumsize);
while (daddr != nsb->lfs_offset) {
flag = 0;
oncemore:
/* Read in summary block */
bread(fsreadfd, summary, fsbtodb(osb, daddr), osb->lfs_sumsize);
sp = (SEGSUM *)summary;
/*
* Could be a superblock instead of a segment summary.
* XXX should use gseguse, but right now we need to do more
* setup before we can...fix this
*/
if (sp->ss_magic != SS_MAGIC ||
sp->ss_sumsum != cksum(&sp->ss_datasum, osb->lfs_sumsize -
sizeof(sp->ss_sumsum))) {
if (flag == 0) {
daddr += btofsb(osb, LFS_SBPAD);
goto oncemore;
}
return 0x0;
}
bc = check_summary(osb, sp, daddr);
if (bc == 0)
break;
daddr += btofsb(osb, osb->lfs_sumsize + bc);
if (dtosn(osb, daddr) != dtosn(osb, daddr +
btofsb(osb, osb->lfs_sumsize + osb->lfs_bsize)))
daddr = ((SEGSUM *)summary)->ss_next;
}
return daddr;
}
u_quad_t maxtable[] = {
/* 1 */ -1,
/* 2 */ -1,
/* 4 */ -1,
/* 8 */ -1,
/* 16 */ -1,
/* 32 */ -1,
/* 64 */ -1,
/* 128 */ -1,
/* 256 */ -1,
/* 512 */ NDADDR + 128 + 128 * 128 + 128 * 128 * 128,
/* 1024 */ NDADDR + 256 + 256 * 256 + 256 * 256 * 256,
/* 2048 */ NDADDR + 512 + 512 * 512 + 512 * 512 * 512,
/* 4096 */ NDADDR + 1024 + 1024 * 1024 + 1024 * 1024 * 1024,
/* 8192 */ 1 << 31,
/* 16 K */ 1 << 31,
/* 32 K */ 1 << 31,
};
int
setup(const char *dev)
{
long bmapsize;
struct disklabel *lp;
#if 0
long i;
off_t sizepb;
#endif
struct stat statb;
daddr_t daddr;
struct lfs proto;
int doskipclean;
u_int64_t maxfilesize;
struct lfs *sb0, *sb1, *osb, *nsb;
struct dinode *idinode;
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(LFS_SBPAD);
asblk.b_un.b_buf = malloc(LFS_SBPAD);
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);
#if 0 /* XXX find the LFS way to do this */
for (cg = 0; cg < proto.lfs_ncg; cg++) {
bflag = fsbtodb(&proto, cgsblock(&proto, cg));
if (readsb(0) != 0)
break;
}
if (cg >= proto.lfs_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);
}
#else
pwarn("XXX Can't look for alternate superblocks yet\n");
return (0);
#endif
doskipclean = 0;
pwarn("USING ALTERNATE SUPERBLOCK AT %d\n", bflag);
}
bufinit();
if (bflag == 0x0 && idaddr == 0x0) {
/*
* If we read a proper superblock, but its address was not
* lfs_sboffs[0], we're holding a fake primary superblock,
* and need to read the real one.
*/
if (sblock.lfs_sboffs[0] != dbtofsb(&sblock,
LFS_LABELPAD / dev_bsize))
{
if (debug)
pwarn("Getting 'real' prinary superblock from 0x%x\n",
fsbtodb(&sblock, sblock.lfs_sboffs[0]));
bflag = fsbtodb(&sblock, sblock.lfs_sboffs[0]);
readsb(1);
bflag = 0;
}
/*
* Even if that superblock read in properly, it may not
* be guaranteed to point to a complete checkpoint.
* Read in the second superblock too, and take whichever
* of the two is *less* recent. --ks
*/
sb0 = malloc(sizeof(*sb0));
sb1 = malloc(sizeof(*sb1));
memcpy(sb0, &sblock, sizeof(*sb0));
bflag = fsbtodb(&sblock, sblock.lfs_sboffs[1]);
if (readsb(1) == 0) {
pwarn("COULDN'T READ ALT SUPERBLOCK AT BLK %d", bflag);
if (reply("ASSUME PRIMARY SUPERBLOCK IS GOOD") == 0) {
return (0);
} else {/* use primary as good */
memcpy(&sblock, sb0, sizeof(*sb0)); /* XXX cheating? */
}
} else {
memcpy(sb1, &sblock, sizeof(*sb1));
if (debug) {
if (sb0->lfs_version > 1) {
pwarn("sb0 sn=%lld, sb1 sn=%lld\n",
(long long)sb0->lfs_serial,
(long long)sblock.lfs_serial);
} else {
pwarn("sb0 %lld, sb1 %lld\n",
(long long)sb0->lfs_otstamp,
(long long)sblock.lfs_otstamp);
}
}
/*
* Verify the checkpoint of the newer superblock,
* if the timestamp of the two superblocks is
* different. XXX use lfs_offset instead, discover
* how to quickly discover "newness" based on that.
*/
if ((sb0->lfs_version == 1 &&
sb0->lfs_otstamp != sb1->lfs_otstamp) ||
(sb0->lfs_version > 1 &&
sb0->lfs_serial != sb1->lfs_serial)) {
if (sb0->lfs_version == 1) {
if (sb0->lfs_otstamp > sb1->lfs_otstamp) {
osb = sb1;
nsb = sb0;
} else {
osb = sb0;
nsb = sb1;
}
} else {
if (sb0->lfs_serial > sb1->lfs_serial) {
osb = sb1;
nsb = sb0;
} else {
osb = sb0;
nsb = sb1;
}
}
daddr = try_verify(osb, nsb);
if (debug)
printf("done.\n");
if (daddr == nsb->lfs_offset) {
pwarn("Checkpoint verified, recovered %lld seconds of data\n",
(long long)nsb->lfs_tstamp - (long long)osb->lfs_tstamp);
memcpy(&sblock, nsb, sizeof(*nsb));
sbdirty();
} else {
pwarn("Checkpoint invalid, lost %lld seconds of data\n", (long long)nsb->lfs_tstamp - (long long)osb->lfs_tstamp);
memcpy(&sblock, osb, sizeof(*osb));
}
}
}
free(sb0);
free(sb1);
}
if (idaddr == 0x0)
idaddr = sblock.lfs_idaddr;
if (debug) {
printf("dev_bsize = %lu\n", dev_bsize);
printf("lfs_bsize = %lu\n", (unsigned long)sblock.lfs_bsize);
printf("lfs_fsize = %lu\n", (unsigned long)sblock.lfs_fsize);
printf("lfs_frag = %lu\n", (unsigned long)sblock.lfs_frag);
printf("INOPB(fs) = %lu\n", (unsigned long)INOPB(&sblock));
if (sblock.lfs_version > 1)
printf("INOPF(fs) = %lu\n",
(unsigned long)INOPF(&sblock));
/* printf("fsbtodb(fs,1) = %lu\n",fsbtodb(&sblock,1)); */
}
/* Compatibility */
if (sblock.lfs_version == 1) {
sblock.lfs_sumsize = LFS_V1_SUMMARY_SIZE;
sblock.lfs_ibsize = sblock.lfs_bsize;
sblock.lfs_start = sblock.lfs_sboffs[0];
sblock.lfs_fsbtodb = 0;
}
initbarea(&iblk);
iblk.b_un.b_buf = malloc(sblock.lfs_ibsize);
if (bread(fsreadfd, (char *)iblk.b_un.b_buf, fsbtodb(&sblock, idaddr),
(long)sblock.lfs_ibsize) != 0) {
printf("Couldn't read disk block %d\n", idaddr);
exit(1);
}
idinode = lfs_difind(&sblock, sblock.lfs_ifile, &ifblock);
if (idinode == NULL) {
printf("Ifile inode not found at daddr 0x%x\n", idaddr);
exit(1);
/* XXX find it in the segment summaries */
}
maxino = ((idinode->di_size
- (sblock.lfs_cleansz + sblock.lfs_segtabsz) * sblock.lfs_bsize)
/ sblock.lfs_bsize) * sblock.lfs_ifpb;
if (debug)
printf("maxino = %d\n", maxino);
din_table = (daddr_t *)malloc(maxino * sizeof(*din_table));
memset(din_table, 0, maxino * sizeof(*din_table));
seg_table = (SEGUSE *)malloc(sblock.lfs_nseg * sizeof(SEGUSE));
memset(seg_table, 0, sblock.lfs_nseg * sizeof(SEGUSE));
if (sblock.lfs_version == 1)
maxfsblock = sblock.lfs_size * (sblock.lfs_bsize / dev_bsize);
else
maxfsblock = sblock.lfs_size;
maxfilesize = maxtable[sblock.lfs_bshift] << sblock.lfs_bshift;
if ((sblock.lfs_minfree < 0 || sblock.lfs_minfree > 99)) {
pfatal("IMPOSSIBLE MINFREE=%d IN SUPERBLOCK",
sblock.lfs_minfree);
if (reply("SET TO DEFAULT") == 1) {
sblock.lfs_minfree = 10;
sbdirty();
}
}
if (sblock.lfs_bmask != sblock.lfs_bsize - 1) {
pwarn("INCORRECT BMASK=%x IN SUPERBLOCK (should be %x)",
(unsigned int)sblock.lfs_bmask,
(unsigned int)sblock.lfs_bsize - 1);
sblock.lfs_bmask = sblock.lfs_bsize - 1;
if (preen)
printf(" (FIXED)\n");
if (preen || reply("FIX") == 1) {
sbdirty();
dirty(&asblk);
}
}
#if 0 /* FFS-specific checks */
if (sblock.lfs_fmask != ~(sblock.lfs_fsize - 1)) {
pwarn("INCORRECT FMASK=%x IN SUPERBLOCK",
sblock.lfs_fmask);
sblock.lfs_fmask = ~(sblock.lfs_fsize - 1);
if (preen)
printf(" (FIXED)\n");
if (preen || reply("FIX") == 1) {
sbdirty();
dirty(&asblk);
}
}
#endif
if (sblock.lfs_maxfilesize != maxfilesize) {
pwarn(
"INCORRECT MAXFILESIZE=%llu IN SUPERBLOCK (should be %llu)",
(unsigned long long)sblock.lfs_maxfilesize,
(unsigned long long)maxfilesize);
sblock.lfs_maxfilesize = maxfilesize;
if (preen)
printf(" (FIXED)\n");
if (preen || reply("FIX") == 1) {
sbdirty();
dirty(&asblk);
}
}
if (sblock.lfs_maxsymlinklen != MAXSYMLINKLEN) {
pwarn("INCORRECT MAXSYMLINKLEN=%d IN SUPERBLOCK",
sblock.lfs_maxsymlinklen);
sblock.lfs_maxsymlinklen = MAXSYMLINKLEN;
if (preen)
printf(" (FIXED)\n");
if (preen || reply("FIX") == 1) {
sbdirty();
dirty(&asblk);
}
}
newinofmt = 1;
/*
* allocate and initialize the necessary maps
*/
#ifndef VERBOSE_BLOCKMAP
bmapsize = roundup(howmany(maxfsblock, NBBY), sizeof(int16_t));
blockmap = calloc((unsigned)bmapsize, sizeof(char));
#else
bmapsize = maxfsblock * sizeof(ino_t);
blockmap = (ino_t *)calloc(maxfsblock, sizeof(ino_t));
#endif
if (blockmap == NULL) {
printf("cannot alloc %u bytes for blockmap\n",
(unsigned)bmapsize);
goto badsblabel;
}
statemap = calloc((unsigned)maxino, sizeof(char));
if (statemap == NULL) {
printf("cannot alloc %u bytes for statemap\n",
(unsigned)maxino);
goto badsblabel;
}
typemap = calloc((unsigned)maxino, sizeof(char));
if (typemap == NULL) {
printf("cannot alloc %u bytes for typemap\n",
(unsigned)maxino);
goto badsblabel;
}
lncntp = (int16_t *)calloc((unsigned)maxino, sizeof(int16_t));
if (lncntp == NULL) {
printf("cannot alloc %lu bytes for lncntp\n",
(unsigned long)maxino * sizeof(int16_t));
goto badsblabel;
}
return (1);
badsblabel:
ckfini(0);
return (0);
}
/*
* Read in the LFS super block and its summary info.
*/
static int
readsb(int listerr)
{
daddr_t super = bflag ? bflag : LFS_LABELPAD / dev_bsize;
u_int32_t checksum;
if (bread(fsreadfd, (char *) &sblock, super, (long) LFS_SBPAD) != 0)
return (0);
sblk.b_bno = super;
sblk.b_size = LFS_SBPAD;
/*
* run a few consistency checks of the super block
*/
if (sblock.lfs_magic != LFS_MAGIC) {
badsb(listerr, "MAGIC NUMBER WRONG");
return (0);
}
/* checksum */
checksum = lfs_sb_cksum(&(sblock.lfs_dlfs));
if (sblock.lfs_cksum != checksum) {
printf("Superblock checksum (%lu)does not match computed checksum %lu\n",
(unsigned long)sblock.lfs_cksum, (unsigned long) checksum);
}
#if 0 /* XXX - replace these checks with
* appropriate LFS sanity checks */
if (sblock.lfs_ncg < 1) {
badsb(listerr, "NCG OUT OF RANGE");
return (0);
}
if (sblock.lfs_cpg < 1) {
badsb(listerr, "CPG OUT OF RANGE");
return (0);
}
if (sblock.lfs_ncg * sblock.lfs_cpg < sblock.lfs_ncyl ||
(sblock.lfs_ncg - 1) * sblock.lfs_cpg >= sblock.lfs_ncyl) {
badsb(listerr, "NCYL LESS THAN NCG*CPG");
return (0);
}
if (sblock.lfs_sbsize > SBSIZE) {
badsb(listerr, "SIZE PREPOSTEROUSLY LARGE");
return (0);
}
#endif
/*
* 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;
#if 0
dev_bsize = sblock.lfs_bsize / fsbtodb(&sblock, 1);
#endif
sblk.b_bno = super / dev_bsize;
if (bflag) {
havesb = 1;
return (1);
}
#if 0 /* XXX - for now skip the alt. superblock
* test as well */
/*
* 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, cgsblock(&sblock, sblock.lfs_ncg - 1), sblock.lfs_sbsize);
if (asblk.b_errs)
return (0);
altsblock.lfs_firstfield = sblock.lfs_firstfield;
altsblock.lfs_fscktime = sblock.lfs_fscktime;
altsblock.lfs_time = sblock.lfs_time;
altsblock.lfs_cstotal = sblock.lfs_cstotal;
altsblock.lfs_cgrotor = sblock.lfs_cgrotor;
altsblock.lfs_fmod = sblock.lfs_fmod;
altsblock.lfs_clean = sblock.lfs_clean;
altsblock.lfs_ronly = sblock.lfs_ronly;
altsblock.lfs_flags = sblock.lfs_flags;
altsblock.lfs_maxcontig = sblock.lfs_maxcontig;
altsblock.lfs_minfree = sblock.lfs_minfree;
altsblock.lfs_optim = sblock.lfs_optim;
altsblock.lfs_rotdelay = sblock.lfs_rotdelay;
altsblock.lfs_maxbpg = sblock.lfs_maxbpg;
memcpy(altsblock.lfs_csp, sblock.lfs_csp,
sizeof sblock.lfs_csp);
altsblock.lfs_maxcluster = sblock.lfs_maxcluster;
memcpy(altsblock.lfs_fsmnt, sblock.lfs_fsmnt,
sizeof sblock.lfs_fsmnt);
memcpy(altsblock.lfs_sparecon, sblock.lfs_sparecon,
sizeof sblock.lfs_sparecon);
/*
* The following should not have to be copied.
*/
altsblock.lfs_fsbtodb = sblock.lfs_fsbtodb;
altsblock.lfs_interleave = sblock.lfs_interleave;
altsblock.lfs_npsect = sblock.lfs_npsect;
altsblock.lfs_nrpos = sblock.lfs_nrpos;
altsblock.lfs_state = sblock.lfs_state;
altsblock.lfs_qbmask = sblock.lfs_qbmask;
altsblock.lfs_qfmask = sblock.lfs_qfmask;
altsblock.lfs_state = sblock.lfs_state;
altsblock.lfs_maxfilesize = sblock.lfs_maxfilesize;
if (memcmp(&sblock, &altsblock, (int)sblock.lfs_sbsize)) {
if (debug) {
long *nlp, *olp, *endlp;
printf("superblock mismatches\n");
nlp = (long *) &altsblock;
olp = (long *) &sblock;
endlp = olp + (sblock.lfs_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);
}
#endif
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(const char *dev, int devfd, struct lfs * 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 (lp == NULL) {
dev_bsize = DEV_BSIZE;
} else {
if (isdigit(*cp))
pp = &lp->d_partitions[0];
else
pp = &lp->d_partitions[*cp - 'a'];
if (pp->p_fstype != FS_BSDLFS) {
pfatal("%s: NOT LABELED AS AN LFS FILE SYSTEM (%s)\n",
dev, pp->p_fstype < FSMAXTYPES ?
fstypenames[pp->p_fstype] : "unknown");
return (0);
}
memset(fs, 0, sizeof(struct lfs));
fs->lfs_fsize = pp->p_fsize;
fs->lfs_frag = pp->p_frag;
fs->lfs_size = pp->p_size;
fs->lfs_nspf = fs->lfs_fsize / lp->d_secsize;
dev_bsize = lp->d_secsize;
for (fs->lfs_fsbtodb = 0, i = fs->lfs_nspf; i > 1; i >>= 1)
fs->lfs_fsbtodb++;
}
return (1);
}
static struct disklabel *
getdisklabel(const 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));
#if 0
errexit("%s: can't read disk label\n", s);
#else
return NULL;
#endif
}
return (&lab);
}
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