* Copyright (c) 1980, 1990, 1993

/* $NetBSD: quotacheck.c,v 1.51 2023/01/07 19:41:30 chs Exp $ */

/*
* Copyright (c) 1980, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Robert Elz at The University of Melbourne.
*
* 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/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1980, 1990, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)quotacheck.c 8.6 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: quotacheck.c,v 1.51 2023/01/07 19:41:30 chs Exp $");
#endif
#endif /* not lint */

/*
* Fix up / report on disk quotas & usage
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/queue.h>
#include <sys/statvfs.h>

#include <ufs/ufs/dinode.h>
#include <ufs/ufs/quota1.h>
#include <ufs/ufs/ufs_bswap.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>

#include <err.h>
#include <fcntl.h>
#include <fstab.h>
#include <pwd.h>
#include <grp.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <util.h>

#include "fsutil.h"
#include "quotautil.h"

#ifndef FS_UFS1_MAGIC
# define FS_UFS1_MAGIC FS_MAGIC /* 0x011954 */
# define FS_UFS1_MAGIC_SWAPPED 0x54190100 /* bswap32(0x011954) */
# define DINODE1_SIZE sizeof(struct dinode)
# define DINODE2_SIZE 0
#else
# define HAVE_UFSv2 1
#endif

#ifndef SBLOCKSIZE
# define SBLOCKSIZE SBSIZE
#endif
#ifndef SBLOCKSEARCH
# define SBLOCKSEARCH { SBSIZE, -1 }
#endif

static const char *quotagroup = QUOTAGROUP;

static union {
struct fs sblk;
char dummy[MAXBSIZE];
} un;
#define sblock un.sblk
static long dev_bsize;
static long maxino;

struct quotaname {
long flags;
char grpqfname[MAXPATHLEN + 1];
char usrqfname[MAXPATHLEN + 1];
};
#define HASUSR 1
#define HASGRP 2

struct fileusage {
struct fileusage *fu_next;
u_long fu_curinodes;
u_long fu_curblocks;
uint32_t fu_id; /* uid_t, gid_t */
char fu_name[1];
/* actually bigger */
};
#define FUHASH 1024 /* must be power of two */
static struct fileusage *fuhead[MAXQUOTAS][FUHASH];

union comb_dinode {
#ifdef HAVE_UFSv2
struct ufs1_dinode dp1;
struct ufs2_dinode dp2;
#else
struct dinode dp1;
#endif
};
#ifdef HAVE_UFSv2
#define DIP(dp, field) \
(is_ufs2 ? (dp)->dp2.di_##field : (dp)->dp1.di_##field)
#else
#define DIP(dp, field) (dp)->dp1.di_##field
#endif

static int aflag; /* all file systems */
static int gflag; /* check group quotas */
static int uflag; /* check user quotas */
static int vflag; /* verbose */
static int qflag; /* quick but untidy mode */
static int fi; /* open disk file descriptor */
static uint32_t highid[MAXQUOTAS];/* highest addid()'ed identifier per type */
static int needswap; /* FS is in swapped order */
static int got_siginfo = 0; /* got a siginfo signal */
static int is_ufs2;

static void usage(void) __attribute__((__noreturn__));
static void *needchk(struct fstab *);
static int chkquota(const char *, const char *, const char *, void *, pid_t *);
static int update(const char *, const char *, int);
static uint32_t skipforward(uint32_t, uint32_t, FILE *);
static int getquotagid(void);
static struct fileusage *lookup(uint32_t, int);
static struct fileusage *addid(uint32_t, int, const char *);
static uint32_t subsequent(uint32_t, int) ;
static union comb_dinode *getnextinode(ino_t);
static void setinodebuf(ino_t);
static void freeinodebuf(void);
static void bread(daddr_t, char *, long);
static void infohandler(int sig);
static void swap_dinode1(union comb_dinode *, int);
#ifdef HAVE_UFSv2
static void swap_dinode2(union comb_dinode *, int);
#endif

int
main(int argc, char *argv[])
{
struct fstab *fs;
struct passwd *pw;
struct group *gr;
struct quotaname *auxdata;
int i, argnum, maxrun, errs;
long done = 0;
int flags = CHECK_PREEN;
const char *name;
int ch;

errs = maxrun = 0;
while ((ch = getopt(argc, argv, "aguvqdl:")) != -1) {
switch(ch) {
case 'a':
aflag++;
break;
case 'd':
flags |= CHECK_DEBUG;
break;
case 'g':
gflag++;
break;
case 'u':
uflag++;
break;
case 'q':
qflag++;
break;
case 'v':
vflag++;
break;
case 'l':
maxrun = atoi(optarg);
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if ((argc == 0 && !aflag) || (argc > 0 && aflag) || (!aflag && maxrun))
usage();
if (!gflag && !uflag) {
gflag++;
uflag++;
}

/* If -a, we do not want to pay the cost of processing every
* group and password entry if there are no filesystems with quotas
*/
if (aflag) {
i = 0;
while ((fs = getfsent()) != NULL) {
if (needchk(fs))
i = 1;
}
endfsent();
if (!i) /* No filesystems with quotas */
return 0;
}

if (gflag) {
setgrent();
while ((gr = getgrent()) != 0)
(void) addid((uint32_t)gr->gr_gid, GRPQUOTA, gr->gr_name);
endgrent();
}
if (uflag) {
setpwent();
while ((pw = getpwent()) != 0)
(void) addid((uint32_t)pw->pw_uid, USRQUOTA, pw->pw_name);
endpwent();
}
if (aflag)
exit(checkfstab(flags, maxrun, needchk, chkquota));
if (setfsent() == 0)
err(1, "%s: can't open", FSTAB);
while ((fs = getfsent()) != NULL) {
const char *fsspec;
char buf[MAXPATHLEN];
fsspec = getfsspecname(buf, sizeof(buf), fs->fs_spec);
if (fsspec == NULL) {
warn("%s", buf);
continue;
}
if (((argnum = oneof(fs->fs_file, argv, argc)) >= 0 ||
(argnum = oneof(fsspec, argv, argc)) >= 0) &&
(auxdata = needchk(fs)) &&
(name = blockcheck(fsspec))) {
done |= 1 << argnum;
errs += chkquota(fs->fs_type, name, fs->fs_file,
auxdata, NULL);
}
}
endfsent();
for (i = 0; i < argc; i++)
if ((done & (1 << i)) == 0)
warnx("%s not found in %s", argv[i], FSTAB);
return errs;
}

static void
usage(void)
{
const char *p = getprogname();
(void)fprintf(stderr, "Usage: %s -a [-gquv] [-l <maxparallel>]\n"
"\t%s [-gquv] <filesys> ...\n", p, p);
exit(1);
}

static void *
needchk(struct fstab *fs)
{
struct quotaname *qnp;
char qfnp[MAXPATHLEN];

if (strcmp(fs->fs_vfstype, "ffs") ||
strcmp(fs->fs_type, FSTAB_RW))
return (NULL);
if ((qnp = malloc(sizeof(*qnp))) == NULL)
err(1, "%s", strerror(errno));
qnp->flags = 0;
if (gflag && hasquota(qfnp, sizeof(qfnp), fs, GRPQUOTA)) {
strlcpy(qnp->grpqfname, qfnp, sizeof(qnp->grpqfname));
qnp->flags |= HASGRP;
}
if (uflag && hasquota(qfnp, sizeof(qfnp), fs, USRQUOTA)) {
strlcpy(qnp->usrqfname, qfnp, sizeof(qnp->usrqfname));
qnp->flags |= HASUSR;
}
if (qnp->flags)
return (qnp);
free(qnp);
return (NULL);
}

static off_t sblock_try[] = SBLOCKSEARCH;

/*
* Scan the specified filesystem to check quota(s) present on it.
*/
static int
chkquota(const char *type, const char *fsname, const char *mntpt, void *v,
pid_t *pid)
{
struct quotaname *qnp = v;
struct fileusage *fup;
union comb_dinode *dp;
int i, mode, errs = 0, inosused;
uint32_t cg;
ino_t ino;
struct cg *cgp;
char msgbuf[4096];

if (pid != NULL) {
fflush(stdout);
switch ((*pid = fork())) {
default:
return 0;
case 0:
break;
case -1:
err(1, "Cannot fork");
}
setvbuf(stdout, msgbuf, _IOFBF, sizeof msgbuf);
}

if ((fi = open(fsname, O_RDONLY, 0)) < 0) {
warn("Cannot open %s", fsname);
if (pid != NULL)
exit(1);
return 1;
}
if (vflag) {
(void)printf("*** Checking ");
if (qnp->flags & HASUSR)
(void)printf("%s%s", qfextension[USRQUOTA],
(qnp->flags & HASGRP) ? " and " : "");
if (qnp->flags & HASGRP)
(void)printf("%s", qfextension[GRPQUOTA]);
(void)printf(" quotas for %s (%s)\n", fsname, mntpt);
fflush(stdout);
}
signal(SIGINFO, infohandler);
sync();
dev_bsize = 1;

for (i = 0; ; i++) {
if (sblock_try[i] == -1) {
warnx("%s: superblock not found", fsname);
if (pid != NULL)
exit(1);
return 1;
}
bread(sblock_try[i], (char *)&sblock, SBLOCKSIZE);
switch (sblock.fs_magic) {
#ifdef HAVE_UFSv2
case FS_UFS2EA_MAGIC:
sblock.fs_magic = FS_UFS2_MAGIC;
/*FALLTHROUGH*/
case FS_UFS2_MAGIC:
is_ufs2 = 1;
/*FALLTHROUGH*/
#endif
case FS_UFS1_MAGIC:
break;
#ifdef HAVE_UFSv2
case FS_UFS2EA_MAGIC_SWAPPED:
sblock.fs_magic = FS_UFS2_MAGIC_SWAPPED;
/*FALLTHROUGH*/
case FS_UFS2_MAGIC_SWAPPED:
is_ufs2 = 1;
/*FALLTHROUGH*/
#endif
case FS_UFS1_MAGIC_SWAPPED:
needswap = 1;
ffs_sb_swap(&sblock, &sblock);
break;
default:
continue;
}

#ifdef HAVE_UFSv2
if (is_ufs2 || sblock.fs_old_flags & FS_FLAGS_UPDATED) {
if (sblock.fs_sblockloc != sblock_try[i])
continue;
} else {
if (sblock_try[i] == SBLOCK_UFS2)
continue;
}
#endif
break;
}

cgp = malloc(sblock.fs_cgsize);
if (cgp == NULL) {
warn("%s: can't allocate %d bytes of cg space", fsname,
sblock.fs_cgsize);
if (pid != NULL)
exit(1);
return 1;
}

dev_bsize = sblock.fs_fsize / FFS_FSBTODB(&sblock, 1);
maxino = sblock.fs_ncg * sblock.fs_ipg;
for (cg = 0; cg < sblock.fs_ncg; cg++) {
ino = cg * sblock.fs_ipg;
setinodebuf(ino);
#ifdef HAVE_UFSv2
if (sblock.fs_magic == FS_UFS2_MAGIC) {
bread(FFS_FSBTODB(&sblock, cgtod(&sblock, cg)), (char *)cgp,
sblock.fs_cgsize);
if (needswap)
ffs_cg_swap(cgp, cgp, &sblock);
inosused = cgp->cg_initediblk;
} else
#endif
inosused = sblock.fs_ipg;
for (i = 0; i < inosused; i++, ino++) {
if (got_siginfo) {
fprintf(stderr,
"%s: cyl group %d of %d (%d%%)\n",
fsname, cg, sblock.fs_ncg,
cg * 100 / sblock.fs_ncg);
got_siginfo = 0;
}
if (ino < UFS_ROOTINO)
continue;
if ((dp = getnextinode(ino)) == NULL)
continue;
if ((mode = DIP(dp, mode) & IFMT) == 0)
continue;
if (qnp->flags & HASGRP) {
fup = addid(DIP(dp, gid), GRPQUOTA,
(char *)0);
fup->fu_curinodes++;
if (mode == IFREG || mode == IFDIR ||
mode == IFLNK)
fup->fu_curblocks += DIP(dp, blocks);
}
if (qnp->flags & HASUSR) {
fup = addid(DIP(dp, uid), USRQUOTA,
(char *)0);
fup->fu_curinodes++;
if (mode == IFREG || mode == IFDIR ||
mode == IFLNK)
fup->fu_curblocks += DIP(dp, blocks);
}
}
}
freeinodebuf();
free(cgp);
if (qnp->flags & HASUSR)
errs += update(mntpt, qnp->usrqfname, USRQUOTA);
if (qnp->flags & HASGRP)
errs += update(mntpt, qnp->grpqfname, GRPQUOTA);
close(fi);
if (pid != NULL)
exit(errs);
return errs;
}

/*
* Update a specified quota file.
*/
static int
update(const char *fsname, const char *quotafile, int type)
{
struct fileusage *fup;
FILE *qfi, *qfo;
uint32_t id, lastid, nextid;
int need_seek;
struct dqblk dqbuf;
static struct dqblk zerodqbuf;
static struct fileusage zerofileusage;
struct statvfs *fst;
int nfst, i;

nfst = getmntinfo(&fst, MNT_WAIT);
if (nfst == 0)
errx(1, "no filesystems mounted!");

for (i = 0; i < nfst; i++) {
if (strncmp(fst[i].f_fstypename, "ffs",
sizeof(fst[i].f_fstypename)) == 0 &&
strncmp(fst[i].f_mntonname, fsname,
sizeof(fst[i].f_mntonname)) == 0 &&
(fst[i].f_flag & ST_QUOTA) != 0) {
warnx("filesystem %s has quotas already turned on",
fsname);
}
}

if ((qfo = fopen(quotafile, "r+")) == NULL) {
if (errno == ENOENT)
qfo = fopen(quotafile, "w+");
if (qfo) {
(void) fprintf(stderr,
"quotacheck: creating quota file %s\n", quotafile);
#define MODE (S_IRUSR|S_IWUSR|S_IRGRP)
(void) fchown(fileno(qfo), getuid(), getquotagid());
(void) fchmod(fileno(qfo), MODE);
} else {
(void) fprintf(stderr,
"quotacheck: %s: %s\n", quotafile, strerror(errno));
return (1);
}
}
if ((qfi = fopen(quotafile, "r")) == NULL) {
(void) fprintf(stderr,
"quotacheck: %s: %s\n", quotafile, strerror(errno));
(void) fclose(qfo);
return (1);
}
need_seek = 1;
for (lastid = highid[type], id = 0; id <= lastid; id = nextid) {
if (fread((char *)&dqbuf, sizeof(struct dqblk), 1, qfi) == 0)
dqbuf = zerodqbuf;
if ((fup = lookup(id, type)) == 0)
fup = &zerofileusage;

nextid = subsequent(id, type);
/* watch out for id == UINT32_MAX */
if (nextid > 0 && nextid != id + 1)
nextid = skipforward(id, nextid, qfi);

if (got_siginfo) {
/*
* XXX this could try to show percentage through
* the ID list
*/
fprintf(stderr, "%s: updating %s quotas for id=%"
PRIu32 " (%s)\n", fsname,
qfextension[type < MAXQUOTAS ? type : MAXQUOTAS],
id, fup->fu_name);
got_siginfo = 0;
}
if (dqbuf.dqb_curinodes == fup->fu_curinodes &&
dqbuf.dqb_curblocks == fup->fu_curblocks) {
fup->fu_curinodes = 0; /* reset usage */
fup->fu_curblocks = 0; /* for next filesystem */

need_seek = 1;
/* infinite loop avoidance (OR do as "nextid < id"?) */
if (id == UINT32_MAX || nextid == 0) {
break;
}
continue;
}
if (vflag) {
if (aflag)
printf("%s: ", fsname);
printf("%-8s fixed:", fup->fu_name);
if (dqbuf.dqb_curinodes != fup->fu_curinodes)
(void)printf("\tinodes %d -> %ld",
dqbuf.dqb_curinodes, fup->fu_curinodes);
if (dqbuf.dqb_curblocks != fup->fu_curblocks)
(void)printf("\tblocks %d -> %ld",
dqbuf.dqb_curblocks, fup->fu_curblocks);
(void)printf("\n");
}
/*
* Reset time limit if have a soft limit and were
* previously under it, but are now over it.
*/
if (dqbuf.dqb_bsoftlimit &&
dqbuf.dqb_curblocks < dqbuf.dqb_bsoftlimit &&
fup->fu_curblocks >= dqbuf.dqb_bsoftlimit)
dqbuf.dqb_btime = 0;
if (dqbuf.dqb_isoftlimit &&
dqbuf.dqb_curinodes < dqbuf.dqb_isoftlimit &&
fup->fu_curinodes >= dqbuf.dqb_isoftlimit)
dqbuf.dqb_itime = 0;
dqbuf.dqb_curinodes = fup->fu_curinodes;
dqbuf.dqb_curblocks = fup->fu_curblocks;

if (need_seek) {
(void) fseeko(qfo, (off_t)id * sizeof(struct dqblk),
SEEK_SET);
need_seek = nextid != id + 1;
}
(void) fwrite(&dqbuf, sizeof(struct dqblk), 1, qfo);

fup->fu_curinodes = 0;
fup->fu_curblocks = 0;
/* infinite loop avoidance (OR do as "nextid < id"?) */
if (id == UINT32_MAX || nextid == 0) {
break;
}
}
(void)fclose(qfi);
(void)fflush(qfo);
if (highid[type] != UINT32_MAX)
(void)ftruncate(fileno(qfo),
(off_t)((highid[type] + 1) * sizeof(struct dqblk)));
(void)fclose(qfo);
return 0;
}

static uint32_t
skipforward(uint32_t cur, uint32_t to, FILE *qfi)
{
struct dqblk dqbuf;

if (qflag) {
(void)fseeko(qfi, (off_t)to * sizeof(struct dqblk), SEEK_SET);
return to;
}

while (++cur < to) {
/*
* if EOF occurs, nothing left to read, we're done
*/
if (fread((char *)&dqbuf, sizeof(struct dqblk), 1, qfi) == 0)
return (to);

/*
* If we find an entry that shows usage, before the next
* id that has actual usage, we have to stop here, so the
* incorrect entry can be corrected in the file
*/
if (dqbuf.dqb_curinodes != 0 || dqbuf.dqb_curblocks != 0) {
(void)fseek(qfi, -(long)sizeof(struct dqblk), SEEK_CUR);
return cur;
}
}
return to;
}

/*
* Determine the group identifier for quota files.
*/
static int
getquotagid(void)
{
struct group *gr;

if ((gr = getgrnam(quotagroup)) != NULL)
return gr->gr_gid;
return -1;
}

/*
* Routines to manage the file usage table.
*
* Lookup an id of a specific type.
*/
static struct fileusage *
lookup(uint32_t id, int type)
{
struct fileusage *fup;

for (fup = fuhead[type][id & (FUHASH-1)]; fup != 0; fup = fup->fu_next)
if (fup->fu_id == id)
return fup;
return NULL;
}

/*
* Add a new file usage id if it does not already exist.
*/
static struct fileusage *
addid(uint32_t id, int type, const char *name)
{
struct fileusage *fup, **fhp;
size_t len;

if ((fup = lookup(id, type)) != NULL)
return fup;
if (name)
len = strlen(name);
else
len = 10;
if ((fup = calloc(1, sizeof(*fup) + len)) == NULL)
err(1, "%s", strerror(errno));
fhp = &fuhead[type][id & (FUHASH - 1)];
fup->fu_next = *fhp;
*fhp = fup;
fup->fu_id = id;
if (id > highid[type])
highid[type] = id;
if (name)
memmove(fup->fu_name, name, len + 1);
else
(void)snprintf(fup->fu_name, len + 1, "%" PRIu32, id);
return fup;
}

static uint32_t
subsequent(uint32_t id, int type)
{
struct fileusage *fup, **iup, **cup;
uint32_t next, offset;

next = highid[type] + 1;
offset = 0;
cup = iup = &fuhead[type][id & (FUHASH-1)];
do {
++offset;
if (++cup >= &fuhead[type][FUHASH])
cup = &fuhead[type][0];
for (fup = *cup; fup != 0; fup = fup->fu_next) {
if (fup->fu_id > id && fup->fu_id <= id + offset)
return (fup->fu_id);
if (fup->fu_id > id && fup->fu_id < next)
next = fup->fu_id;
}
} while (cup != iup);

return next;
}

/*
* Special purpose version of ginode used to optimize first pass
* over all the inodes in numerical order.
*/
static ino_t nextino, lastinum, lastvalidinum;
static long readcnt, readpercg, fullcnt, inobufsize, partialcnt, partialsize;
static union comb_dinode *inodebuf;
#define INOBUFSIZE 56*1024 /* size of buffer to read inodes */

static union comb_dinode *
getnextinode(ino_t inumber)
{
long size;
daddr_t dblk;
static union comb_dinode *dp;
union comb_dinode *ret;

if (inumber != nextino++ || inumber > lastvalidinum) {
errx(1, "bad inode number %llu to nextinode",
(unsigned long long)inumber);
}

if (inumber >= lastinum) {
readcnt++;
dblk = FFS_FSBTODB(&sblock, ino_to_fsba(&sblock, lastinum));
if (readcnt % readpercg == 0) {
size = partialsize;
lastinum += partialcnt;
} else {
size = inobufsize;
lastinum += fullcnt;
}
(void)bread(dblk, (caddr_t)inodebuf, size);
if (needswap) {
#ifdef HAVE_UFSv2
if (is_ufs2)
swap_dinode2(inodebuf, lastinum - inumber);
else
#endif
swap_dinode1(inodebuf, lastinum - inumber);
}
dp = (union comb_dinode *)inodebuf;
}
ret = dp;
dp = (union comb_dinode *)
((char *)dp + (is_ufs2 ? DINODE2_SIZE : DINODE1_SIZE));
return ret;
}

static void
setinodebuf(ino_t inum)
{

if (inum % sblock.fs_ipg != 0)
errx(1, "bad inode number %llu to setinodebuf",
(unsigned long long)inum);

lastvalidinum = inum + sblock.fs_ipg - 1;
nextino = inum;
lastinum = inum;
readcnt = 0;
if (inodebuf != NULL)
return;
inobufsize = ffs_blkroundup(&sblock, INOBUFSIZE);
fullcnt = inobufsize / (is_ufs2 ? DINODE2_SIZE : DINODE1_SIZE);
readpercg = sblock.fs_ipg / fullcnt;
partialcnt = sblock.fs_ipg % fullcnt;
partialsize = partialcnt * (is_ufs2 ? DINODE2_SIZE : DINODE1_SIZE);
if (partialcnt != 0) {
readpercg++;
} else {
partialcnt = fullcnt;
partialsize = inobufsize;
}
if (inodebuf == NULL &&
(inodebuf = malloc((unsigned)inobufsize)) == NULL)
errx(1, "Cannot allocate space for inode buffer");
while (nextino < UFS_ROOTINO)
getnextinode(nextino);
}

static void
freeinodebuf(void)
{

free(inodebuf);
inodebuf = NULL;
}

#ifdef HAVE_UFSv2
static void
swap_dinode1(union comb_dinode *dp, int n)
{
int i;
struct ufs1_dinode *dp1;

dp1 = (struct ufs1_dinode *)&dp->dp1;
for (i = 0; i < n; i++, dp1++)
ffs_dinode1_swap(dp1, dp1);
}

static void
swap_dinode2(union comb_dinode *dp, int n)
{
int i;
struct ufs2_dinode *dp2;

dp2 = (struct ufs2_dinode *)&dp->dp2;
for (i = 0; i < n; i++, dp2++)
ffs_dinode2_swap(dp2, dp2);
}

#else

static void
swap_dinode1(union comb_dinode *dp, int n)
{
int i;
struct dinode *dp1;

dp1 = (struct dinode *) &dp->dp1;
for (i = 0; i < n; i++, dp1++)
ffs_dinode_swap(dp1, dp1);
}

#endif

/*
* Read specified disk blocks.
*/
static void
bread(daddr_t bno, char *buf, long cnt)
{

if (lseek(fi, (off_t)bno * dev_bsize, SEEK_SET) < 0 ||
read(fi, buf, cnt) != cnt)
err(1, "block %lld", (long long)bno);
}

static void
infohandler(int sig)
{
got_siginfo = 1;
}