/*      $NetBSD: utilities.c,v 1.71 2023/07/05 10:59:08 riastradh 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/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)utilities.c 8.6 (Berkeley) 5/19/95";
#else
__RCSID("$NetBSD: utilities.c,v 1.71 2023/07/05 10:59:08 riastradh Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/time.h>

#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
#include <ufs/ufs/ufs_bswap.h>
#include <ufs/ufs/quota2.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>

#include "fsutil.h"
#include "fsck.h"
#include "extern.h"
#include "exitvalues.h"

long    diskreads, totalreads;  /* Disk cache statistics */

static void rwerror(const char *, daddr_t);

int
ftypeok(union dinode *dp)
{
        switch (iswap16(DIP(dp, mode)) & IFMT) {

        case IFDIR:
        case IFREG:
        case IFBLK:
        case IFCHR:
        case IFLNK:
        case IFSOCK:
        case IFIFO:
                return (1);

        default:
                if (debug)
                        printf("bad file type 0%o\n", iswap16(DIP(dp, mode)));
                return (0);
        }
}

int
reply(const char *question)
{
        int persevere;
        char c;

        if (preen)
                pfatal("INTERNAL ERROR: GOT TO reply()");
        persevere = !strcmp(question, "CONTINUE");
        printf("\n");
        if (!persevere && (nflag || fswritefd < 0)) {
                printf("%s? no\n\n", question);
                resolved = 0;
                return (0);
        }
        if (yflag || (persevere && nflag)) {
                printf("%s? yes\n\n", question);
                return (1);
        }
        do      {
                printf("%s? [yn] ", question);
                (void) fflush(stdout);
                c = getc(stdin);
                while (c != '\n' && getc(stdin) != '\n') {
                        if (feof(stdin)) {
                                resolved = 0;
                                return (0);
                        }
                }
        } while (c != 'y' && c != 'Y' && c != 'n' && c != 'N');
        printf("\n");
        if (c == 'y' || c == 'Y')
                return (1);
        resolved = 0;
        return (0);
}

/*
 * Malloc buffers and set up cache.
 */
void
bufinit(void)
{
        struct bufarea *bp;
        long bufcnt, i;
        char *bufp;

        pbp = pdirbp = (struct bufarea *)0;
        bufp = aligned_alloc(DEV_BSIZE, (unsigned int)sblock->fs_bsize);
        if (bufp == 0)
                errexit("cannot allocate buffer pool");
        cgblk.b_un.b_buf = bufp;
        initbarea(&cgblk);
#ifndef NO_APPLE_UFS
        bufp = aligned_alloc(DEV_BSIZE, (unsigned int)APPLEUFS_LABEL_SIZE);
        if (bufp == 0)
                errexit("cannot allocate buffer pool");
        appleufsblk.b_un.b_buf = bufp;
        initbarea(&appleufsblk);
#endif
        bufhead.b_next = bufhead.b_prev = &bufhead;
        bufcnt = MAXBUFSPACE / sblock->fs_bsize;
        if (bufcnt < MINBUFS)
                bufcnt = MINBUFS;
        for (i = 0; i < bufcnt; i++) {
                bp = malloc(sizeof(struct bufarea));
                bufp = aligned_alloc(DEV_BSIZE, (unsigned int)sblock->fs_bsize);
                if (bp == NULL || bufp == NULL) {
                        if (i >= MINBUFS) {
                                if (bp)
                                        free(bp);
                                if (bufp)
                                        free(bufp);
                                break;
                        }
                        errexit("cannot allocate buffer pool");
                }
                bp->b_un.b_buf = bufp;
                bp->b_prev = &bufhead;
                bp->b_next = bufhead.b_next;
                bufhead.b_next->b_prev = bp;
                bufhead.b_next = bp;
                initbarea(bp);
        }
        bufhead.b_size = i;     /* save number of buffers */
}

/*
 * Manage a cache of directory blocks.
 */
struct bufarea *
getdatablk(daddr_t blkno, long size)
{
        struct bufarea *bp;

        for (bp = bufhead.b_next; bp != &bufhead; bp = bp->b_next)
                if (bp->b_bno == FFS_FSBTODB(sblock, blkno))
                        goto foundit;
        for (bp = bufhead.b_prev; bp != &bufhead; bp = bp->b_prev)
                if ((bp->b_flags & B_INUSE) == 0)
                        break;
        if (bp == &bufhead)
                errexit("deadlocked buffer pool");
        /* fall through */
foundit:
        getblk(bp, blkno, size);
        bp->b_prev->b_next = bp->b_next;
        bp->b_next->b_prev = bp->b_prev;
        bp->b_prev = &bufhead;
        bp->b_next = bufhead.b_next;
        bufhead.b_next->b_prev = bp;
        bufhead.b_next = bp;
        bp->b_flags |= B_INUSE;
        return (bp);
}

void
getblk(struct bufarea *bp, daddr_t blk, long size)
{
        daddr_t dblk;

        dblk = FFS_FSBTODB(sblock, blk);
        totalreads++;
        if (bp->b_bno != dblk) {
                flush(fswritefd, bp);
                diskreads++;
                bp->b_errs = bread(fsreadfd, bp->b_un.b_buf, dblk, size);
                bp->b_bno = dblk;
                bp->b_size = size;
        }
}

void
flush(int fd, struct bufarea *bp)
{
        int i, j;
        struct csum *ccsp;

        if (!bp->b_dirty)
                return;
        if (bp->b_errs != 0)
                pfatal("WRITING %sZERO'ED BLOCK %lld TO DISK\n",
                    (bp->b_errs == bp->b_size / dev_bsize) ? "" : "PARTIALLY ",
                    (long long)bp->b_bno);
        bp->b_dirty = 0;
        bp->b_errs = 0;
        bwrite(fd, bp->b_un.b_buf, bp->b_bno, (long)bp->b_size);
        if (bp != &sblk)
                return;
        for (i = 0, j = 0; i < sblock->fs_cssize; i += sblock->fs_bsize, j++) {
                int size = sblock->fs_cssize - i < sblock->fs_bsize ?
                        sblock->fs_cssize - i : sblock->fs_bsize;
                ccsp = (struct csum *)((char *)sblock->fs_csp + i);
                if (needswap)
                        ffs_csum_swap(ccsp, ccsp, size);
                bwrite(fswritefd, (char *)ccsp,
                    FFS_FSBTODB(sblock, sblock->fs_csaddr + j * sblock->fs_frag),
                    size);
                if (needswap)
                        ffs_csum_swap(ccsp, ccsp, size);
        }
}

static void
rwerror(const char *mesg, daddr_t blk)
{

        if (preen == 0)
                printf("\n");
        pfatal("CANNOT %s: BLK %lld", mesg, (long long)blk);
        if (reply("CONTINUE") == 0)
                exit(FSCK_EXIT_CHECK_FAILED);
}

void
ckfini(int noint)
{
        struct bufarea *bp, *nbp;
        int cnt = 0;

        if (!noint) {
                if (doinglevel2)
                        return;
                markclean = 0;
        }

        if (fswritefd < 0) {
                (void)close(fsreadfd);
                return;
        }
        flush(fswritefd, &sblk);
        if (havesb && bflag != 0 &&
            (preen || reply("UPDATE STANDARD SUPERBLOCK"))) {
                if (preen)
                        pwarn("UPDATING STANDARD SUPERBLOCK\n");
                if (!is_ufs2 && (sblock->fs_old_flags & FS_FLAGS_UPDATED) == 0)
                        sblk.b_bno = SBLOCK_UFS1 / dev_bsize;
                else
                        sblk.b_bno = sblock->fs_sblockloc / dev_bsize;
                sbdirty();
                flush(fswritefd, &sblk);
        }
#ifndef NO_APPLE_UFS
        flush(fswritefd, &appleufsblk);
        free(appleufsblk.b_un.b_buf);
#endif
        flush(fswritefd, &cgblk);
        free(cgblk.b_un.b_buf);
        for (bp = bufhead.b_prev; bp && bp != &bufhead; bp = nbp) {
                cnt++;
                flush(fswritefd, bp);
                nbp = bp->b_prev;
                free(bp->b_un.b_buf);
                free((char *)bp);
        }
        if (bufhead.b_size != cnt)
                errexit("Panic: lost %d buffers", bufhead.b_size - cnt);
        pbp = pdirbp = (struct bufarea *)0;
        if (markclean && (sblock->fs_clean & FS_ISCLEAN) == 0) {
                /*
                 * Mark the file system as clean, and sync the superblock.
                 */
                if (preen)
                        pwarn("MARKING FILE SYSTEM CLEAN\n");
                else if (!reply("MARK FILE SYSTEM CLEAN"))
                        markclean = 0;
                if (markclean) {
                        sblock->fs_clean = FS_ISCLEAN;
                        sblock->fs_pendingblocks = 0;
                        sblock->fs_pendinginodes = 0;
                        sbdirty();
                        flush(fswritefd, &sblk);
                        if (!preen)
                                printf(
                                    "\n***** FILE SYSTEM MARKED CLEAN *****\n");
                }
        }
        if (doing2ea) {
                printf("ENABLING EXTATTR SUPPORT\n");
                is_ufs2ea = 1;
                sbdirty();
                flush(fswritefd, &sblk);
        }
        if (doing2noea) {
                printf("DISABLING EXTATTR SUPPORT\n");
                is_ufs2ea = 0;
                sbdirty();
                flush(fswritefd, &sblk);
        }
        if (debug)
                printf("cache missed %ld of %ld (%d%%)\n", diskreads,
                    totalreads, (int)(diskreads * 100 / totalreads));
        cleanup_wapbl();
        (void)close(fsreadfd);
        (void)close(fswritefd);
}

int
bread(int fd, char *buf, daddr_t blk, long size)
{
        char *cp;
        int i, errs;
        off_t offset;

        offset = blk;
        offset *= dev_bsize;
        if ((pread(fd, buf, (int)size, offset) == size) &&
            read_wapbl(buf, size, blk) == 0)
                return (0);
        rwerror("READ", blk);
        errs = 0;
        memset(buf, 0, (size_t)size);
        printf("THE FOLLOWING DISK SECTORS COULD NOT BE READ:");
        for (cp = buf, i = 0; i < size; i += secsize, cp += secsize) {
                if (pread(fd, cp, (int)secsize, offset + i) != secsize) {
                        if (secsize != dev_bsize && dev_bsize != 1)
                                printf(" %lld (%lld),",
                                    (long long)((blk*dev_bsize + i) / secsize),
                                    (long long)(blk + i / dev_bsize));
                        else
                                printf(" %lld,",
                                    (long long)(blk + i / dev_bsize));
                        errs++;
                }
        }
        printf("\n");
        return (errs);
}

void
bwrite(int fd, char *buf, daddr_t blk, long size)
{
        int i;
        char *cp;
        off_t offset;

        if (fd < 0)
                return;
        offset = blk;
        offset *= dev_bsize;
        if (pwrite(fd, buf, (int)size, offset) == size) {
                fsmodified = 1;
                return;
        }
        rwerror("WRITE", blk);
        printf("THE FOLLOWING SECTORS COULD NOT BE WRITTEN:");
        for (cp = buf, i = 0; i < size; i += dev_bsize, cp += dev_bsize)
                if (pwrite(fd, cp, (int)dev_bsize, offset + i) != dev_bsize)
                        printf(" %lld,", (long long)(blk + i / dev_bsize));
        printf("\n");
        return;
}

/*
 * allocate a data block with the specified number of fragments
 */
daddr_t
allocblk(long frags)
{
        int i, j, k, cg, baseblk;
        struct cg *cgp = cgrp;

        if (frags <= 0 || frags > sblock->fs_frag)
                return (0);
        for (i = 0; i < maxfsblock - sblock->fs_frag; i += sblock->fs_frag) {
                for (j = 0; j <= sblock->fs_frag - frags; j++) {
                        if (testbmap(i + j))
                                continue;
                        for (k = 1; k < frags; k++)
                                if (testbmap(i + j + k))
                                        break;
                        if (k < frags) {
                                j += k;
                                continue;
                        }
                        cg = dtog(sblock, i + j);
                        getblk(&cgblk, cgtod(sblock, cg), sblock->fs_cgsize);
                        memcpy(cgp, cgblk.b_un.b_cg, sblock->fs_cgsize);
                        if ((doswap && !needswap) || (!doswap && needswap))
                                ffs_cg_swap(cgblk.b_un.b_cg, cgp, sblock);
                        if (!cg_chkmagic(cgp, 0))
                                pfatal("CG %d: ALLOCBLK: BAD MAGIC NUMBER\n",
                                    cg);
                        baseblk = dtogd(sblock, i + j);
                        for (k = 0; k < frags; k++) {
                                setbmap(i + j + k);
                                clrbit(cg_blksfree(cgp, 0), baseblk + k);
                        }
                        n_blks += frags;
                        if (frags == sblock->fs_frag) {
                                cgp->cg_cs.cs_nbfree--;
                                sblock->fs_cstotal.cs_nbfree--;
                                sblock->fs_cs(fs, cg).cs_nbfree--;
                                ffs_clusteracct(sblock, cgp,
                                    ffs_fragstoblks(sblock, baseblk), -1);
                        } else {
                                cgp->cg_cs.cs_nffree -= frags;
                                sblock->fs_cstotal.cs_nffree -= frags;
                                sblock->fs_cs(fs, cg).cs_nffree -= frags;
                        }
                        sbdirty();
                        cgdirty();
                        return (i + j);
                }
        }
        return (0);
}

/*
 * Free a previously allocated block
 */
void
freeblk(daddr_t blkno, long frags)
{
        struct inodesc idesc;

        memset(&idesc, 0, sizeof(idesc));
        idesc.id_blkno = blkno;
        idesc.id_numfrags = frags;
        (void)pass4check(&idesc);
}

/*
 * Find a pathname
 */
void
getpathname(char *namebuf, size_t namebuflen, ino_t curdir, ino_t ino)
{
        int len;
        char *cp;
        struct inodesc idesc;
        static int busy = 0;
        struct inostat *info;

        if (curdir == ino && ino == UFS_ROOTINO) {
                (void)strlcpy(namebuf, "/", namebuflen);
                return;
        }
        info = inoinfo(curdir);
        if (busy || (info->ino_state != DSTATE && info->ino_state != DFOUND)) {
                (void)strlcpy(namebuf, "?", namebuflen);
                return;
        }
        busy = 1;
        memset(&idesc, 0, sizeof(struct inodesc));
        idesc.id_type = DATA;
        idesc.id_fix = IGNORE;
        cp = &namebuf[MAXPATHLEN - 1];
        *cp = '\0';
        if (curdir != ino) {
                idesc.id_parent = curdir;
                goto namelookup;
        }
        while (ino != UFS_ROOTINO) {
                idesc.id_number = ino;
                idesc.id_func = findino;
                idesc.id_name = "..";
                if ((ckinode(ginode(ino), &idesc) & FOUND) == 0)
                        break;
        namelookup:
                idesc.id_number = idesc.id_parent;
                idesc.id_parent = ino;
                idesc.id_func = findname;
                idesc.id_name = namebuf;
                if ((ckinode(ginode(idesc.id_number), &idesc)&FOUND) == 0)
                        break;
                len = strlen(namebuf);
                cp -= len;
                memmove(cp, namebuf, (size_t)len);
                *--cp = '/';
                if (cp < &namebuf[FFS_MAXNAMLEN])
                        break;
                ino = idesc.id_number;
        }
        busy = 0;
        if (ino != UFS_ROOTINO)
                *--cp = '?';
        memmove(namebuf, cp, (size_t)(&namebuf[MAXPATHLEN] - cp));
}

/*
 * determine whether an inode should be fixed.
 */
int
dofix(struct inodesc *idesc, const char *msg)
{

        switch (idesc->id_fix) {

        case DONTKNOW:
                if (idesc->id_type == DATA)
                        direrror(idesc->id_number, msg);
                else
                        pwarn("%s", msg);
                if (preen) {
                        printf(" (SALVAGED)\n");
                        idesc->id_fix = FIX;
                        return (ALTERED);
                }
                if (reply("SALVAGE") == 0) {
                        idesc->id_fix = NOFIX;
                        return (0);
                }
                idesc->id_fix = FIX;
                return (ALTERED);

        case FIX:
                return (ALTERED);

        case NOFIX:
        case IGNORE:
                return (0);

        default:
                errexit("UNKNOWN INODESC FIX MODE %d", idesc->id_fix);
        }
        /* NOTREACHED */
        return (0);
}

void
copyback_cg(struct bufarea *blk)
{

        memcpy(blk->b_un.b_cg, cgrp, sblock->fs_cgsize);
        if (needswap)
                ffs_cg_swap(cgrp, blk->b_un.b_cg, sblock);
}

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

/*
 * Look up state information for an inode.
 */
struct inostat *
inoinfo(ino_t inum)
{
        static struct inostat unallocated = { USTATE, 0, 0 };
        struct inostatlist *ilp;
        size_t iloff;

        if (inum > maxino)
                errexit("inoinfo: inumber %llu out of range",
                    (unsigned long long)inum);
        ilp = &inostathead[inum / sblock->fs_ipg];
        iloff = inum % sblock->fs_ipg;
        if (iloff >= ilp->il_numalloced)
                return (&unallocated);
        return (&ilp->il_stat[iloff]);
}

void
sb_oldfscompat_read(struct fs *fs, struct fs **fssave)
{
        if ((fs->fs_magic != FS_UFS1_MAGIC) ||
            (fs->fs_old_flags & FS_FLAGS_UPDATED))
                return;

        /* Save a copy of fields that may be modified for compatibility */
        if (fssave) {
                if (!*fssave)
                        *fssave = malloc(sizeof(struct fs));
                if (!*fssave)
                        errexit("cannot allocate space for compat store");
                memmove(*fssave, fs, sizeof(struct fs));

                if (debug)
                        printf("detected ufs1 superblock not yet updated for ufs2 kernels\n");

                if (doswap) {
                        uint16_t postbl[256];
                        int i, n;

                        if (fs->fs_old_postblformat == FS_42POSTBLFMT)
                                n = 256;
                        else
                                n = 128;

                        /* extract the postbl from the unswapped superblock */
                        if (!needswap)
                                ffs_sb_swap(*fssave, *fssave);
                        memmove(postbl, (&(*fssave)->fs_old_postbl_start),
                            n * sizeof(postbl[0]));
                        if (!needswap)
                                ffs_sb_swap(*fssave, *fssave);

                        /* Now swap it */
                        for (i=0; i < n; i++)
                                postbl[i] = bswap16(postbl[i]);

                        /* And put it back such that it will get correctly
                         * unscrambled if it is swapped again on the way out
                         */
                        if (needswap)
                                ffs_sb_swap(*fssave, *fssave);
                        memmove((&(*fssave)->fs_old_postbl_start), postbl,
                            n * sizeof(postbl[0]));
                        if (needswap)
                                ffs_sb_swap(*fssave, *fssave);
                }

        }

        /* These fields will be overwritten by their
         * original values in fs_oldfscompat_write, so it is harmless
         * to modify them here.
         */
        fs->fs_cstotal.cs_ndir =
            fs->fs_old_cstotal.cs_ndir;
        fs->fs_cstotal.cs_nbfree =
            fs->fs_old_cstotal.cs_nbfree;
        fs->fs_cstotal.cs_nifree =
            fs->fs_old_cstotal.cs_nifree;
        fs->fs_cstotal.cs_nffree =
            fs->fs_old_cstotal.cs_nffree;

        fs->fs_maxbsize = fs->fs_bsize;
        fs->fs_time = fs->fs_old_time;
        fs->fs_size = fs->fs_old_size;
        fs->fs_dsize = fs->fs_old_dsize;
        fs->fs_csaddr = fs->fs_old_csaddr;
        fs->fs_sblockloc = SBLOCK_UFS1;

        fs->fs_flags = fs->fs_old_flags;

        if (fs->fs_old_postblformat == FS_42POSTBLFMT) {
                fs->fs_old_nrpos = 8;
                fs->fs_old_npsect = fs->fs_old_nsect;
                fs->fs_old_interleave = 1;
                fs->fs_old_trackskew = 0;
        }
}

void
sb_oldfscompat_write(struct fs *fs, struct fs *fssave)
{
        if ((fs->fs_magic != FS_UFS1_MAGIC) ||
            (fs->fs_old_flags & FS_FLAGS_UPDATED))
                return;

        fs->fs_old_flags = fs->fs_flags;
        fs->fs_old_time = fs->fs_time;
        fs->fs_old_cstotal.cs_ndir = fs->fs_cstotal.cs_ndir;
        fs->fs_old_cstotal.cs_nbfree = fs->fs_cstotal.cs_nbfree;
        fs->fs_old_cstotal.cs_nifree = fs->fs_cstotal.cs_nifree;
        fs->fs_old_cstotal.cs_nffree = fs->fs_cstotal.cs_nffree;

        fs->fs_flags = fssave->fs_flags;

        if (fs->fs_old_postblformat == FS_42POSTBLFMT) {
                fs->fs_old_nrpos = fssave->fs_old_nrpos;
                fs->fs_old_npsect = fssave->fs_old_npsect;
                fs->fs_old_interleave = fssave->fs_old_interleave;
                fs->fs_old_trackskew = fssave->fs_old_trackskew;
        }

        memmove(&fs->fs_old_postbl_start, &fssave->fs_old_postbl_start,
            ((fs->fs_old_postblformat == FS_42POSTBLFMT) ?
            512 : 256));
}

struct uquot *
find_uquot(struct uquot_hash *uq_hash, uint32_t uid, int alloc)
{
        struct uquot *uq;
        SLIST_FOREACH(uq, &uq_hash[uid & q2h_hash_mask], uq_entries) {
                if (uq->uq_uid == uid)
                        return uq;
        }
        if (!alloc)
                return NULL;
        uq = malloc(sizeof(struct uquot));
        if (uq == NULL)
                errexit("cannot allocate quota entry");
        memset(uq, 0, sizeof(struct uquot));
        uq->uq_uid = uid;
        SLIST_INSERT_HEAD(&uq_hash[uid & q2h_hash_mask], uq, uq_entries);
        return uq;
}

void
remove_uquot(struct uquot_hash *uq_hash, struct uquot *uq)
{
        SLIST_REMOVE(&uq_hash[uq->uq_uid & q2h_hash_mask],
            uq, uquot, uq_entries);
}

void
update_uquot(ino_t inum, uid_t uid, gid_t gid, int64_t bchange, int64_t ichange)
{
        /* simple uquot cache: remember the last used */
        static struct uquot *uq_u = NULL;
        static struct uquot *uq_g = NULL;

        if (inum < UFS_ROOTINO)
                return;
        if (is_journal_inode(inum))
                return;
        if (is_quota_inode(inum))
                return;

        if (uquot_user_hash == NULL)
                return;

        if (uq_u == NULL || uq_u->uq_uid != uid)
                uq_u = find_uquot(uquot_user_hash, uid, 1);
        uq_u->uq_b += bchange;
        uq_u->uq_i += ichange;
        if (uq_g == NULL || uq_g->uq_uid != gid)
                uq_g = find_uquot(uquot_group_hash, gid, 1);
        uq_g->uq_b += bchange;
        uq_g->uq_i += ichange;
}

int
is_quota_inode(ino_t inum)
{

        if ((sblock->fs_flags & FS_DOQUOTA2) == 0)
                return 0;

        if (sblock->fs_quota_magic != Q2_HEAD_MAGIC)
                return 0;

        if (sblock->fs_quotafile[USRQUOTA] == inum)
                return 1;

        if (sblock->fs_quotafile[GRPQUOTA] == inum)
                return 1;

        return 0;
}