usr/src/sbin/fsck/inode.c

/*
 * Copyright (c) 1980, 1986 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)inode.c     5.25 (Berkeley) %G%";
#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 <pwd.h>
#include <stdlib.h>
#include <string.h>
#include "fsck.h"

static ino_t startinum;

ckinode(dp, idesc)
        struct dinode *dp;
        register struct inodesc *idesc;
{
        register daddr_t *ap;
        long ret, n, ndb, offset;
        struct dinode dino;
        quad_t remsize, sizepb;
        mode_t mode;

        if (idesc->id_fix != IGNORE)
                idesc->id_fix = DONTKNOW;
        idesc->id_entryno = 0;
        idesc->id_filesize = dp->di_size;
        mode = dp->di_mode & IFMT;
        if (mode == IFBLK || mode == IFCHR || (mode == IFLNK &&
            dp->di_size < sblock.fs_maxsymlinklen))
                return (KEEPON);
        dino = *dp;
        ndb = howmany(dino.di_size, sblock.fs_bsize);
        for (ap = &dino.di_db[0]; ap < &dino.di_db[NDADDR]; ap++) {
                if (--ndb == 0 && (offset = blkoff(&sblock, dino.di_size)) != 0)
                        idesc->id_numfrags =
                                numfrags(&sblock, fragroundup(&sblock, offset));
                else
                        idesc->id_numfrags = sblock.fs_frag;
                if (*ap == 0)
                        continue;
                idesc->id_blkno = *ap;
                if (idesc->id_type == ADDR)
                        ret = (*idesc->id_func)(idesc);
                else
                        ret = dirscan(idesc);
                if (ret & STOP)
                        return (ret);
        }
        idesc->id_numfrags = sblock.fs_frag;
        remsize = dino.di_size - sblock.fs_bsize * NDADDR;
        sizepb = sblock.fs_bsize;
        for (ap = &dino.di_ib[0], n = 1; n <= NIADDR; ap++, n++) {
                if (*ap) {
                        idesc->id_blkno = *ap;
                        ret = iblock(idesc, n, remsize);
                        if (ret & STOP)
                                return (ret);
                }
                sizepb *= NINDIR(&sblock);
                remsize -= sizepb;
        }
        return (KEEPON);
}

iblock(idesc, ilevel, isize)
        struct inodesc *idesc;
        long ilevel;
        quad_t isize;
{
        register daddr_t *ap;
        register daddr_t *aplim;
        register struct bufarea *bp;
        int i, n, (*func)(), nif;
        quad_t sizepb;
        char buf[BUFSIZ];
        extern int dirscan(), pass1check();

        if (idesc->id_type == ADDR) {
                func = idesc->id_func;
                if (((n = (*func)(idesc)) & KEEPON) == 0)
                        return (n);
        } else
                func = dirscan;
        if (chkrange(idesc->id_blkno, idesc->id_numfrags))
                return (SKIP);
        bp = getdatablk(idesc->id_blkno, sblock.fs_bsize);
        ilevel--;
        for (sizepb = sblock.fs_bsize, i = 0; i < ilevel; i++)
                sizepb *= NINDIR(&sblock);
        nif = howmany(isize , sizepb);
        if (nif > NINDIR(&sblock))
                nif = NINDIR(&sblock);
        if (idesc->id_func == pass1check && nif < NINDIR(&sblock)) {
                aplim = &bp->b_un.b_indir[NINDIR(&sblock)];
                for (ap = &bp->b_un.b_indir[nif]; ap < aplim; ap++) {
                        if (*ap == 0)
                                continue;
                        (void)sprintf(buf, "PARTIALLY TRUNCATED INODE I=%lu",
                                idesc->id_number);
                        if (dofix(idesc, buf)) {
                                *ap = 0;
                                dirty(bp);
                        }
                }
                flush(fswritefd, bp);
        }
        aplim = &bp->b_un.b_indir[nif];
        for (ap = bp->b_un.b_indir; ap < aplim; ap++) {
                if (*ap) {
                        idesc->id_blkno = *ap;
                        if (ilevel == 0) {
                                n = (*func)(idesc);
                        } else {
                                n = iblock(idesc, ilevel, isize);
                                isize -= sizepb;
                        }
                        if (n & STOP) {
                                bp->b_flags &= ~B_INUSE;
                                return (n);
                        }
                }
        }
        bp->b_flags &= ~B_INUSE;
        return (KEEPON);
}

/*
 * Check that a block in a legal block number.
 * Return 0 if in range, 1 if out of range.
 */
chkrange(blk, cnt)
        daddr_t blk;
        int cnt;
{
        register int c;

        if ((unsigned)(blk + cnt) > maxfsblock)
                return (1);
        c = dtog(&sblock, blk);
        if (blk < cgdmin(&sblock, c)) {
                if ((blk + cnt) > cgsblock(&sblock, c)) {
                        if (debug) {
                                printf("blk %ld < cgdmin %ld;",
                                    blk, cgdmin(&sblock, c));
                                printf(" blk + cnt %ld > cgsbase %ld\n",
                                    blk + cnt, cgsblock(&sblock, c));
                        }
                        return (1);
                }
        } else {
                if ((blk + cnt) > cgbase(&sblock, c+1)) {
                        if (debug)  {
                                printf("blk %ld >= cgdmin %ld;",
                                    blk, cgdmin(&sblock, c));
                                printf(" blk + cnt %ld > sblock.fs_fpg %ld\n",
                                    blk+cnt, sblock.fs_fpg);
                        }
                        return (1);
                }
        }
        return (0);
}

/*
 * General purpose interface for reading inodes.
 */
struct dinode *
ginode(inumber)
        ino_t inumber;
{
        daddr_t iblk;

        if (inumber < ROOTINO || inumber > maxino)
                errexit("bad inode number %d to ginode\n", inumber);
        if (startinum == 0 ||
            inumber < startinum || inumber >= startinum + INOPB(&sblock)) {
                iblk = itod(&sblock, inumber);
                if (pbp != 0)
                        pbp->b_flags &= ~B_INUSE;
                pbp = getdatablk(iblk, sblock.fs_bsize);
                startinum = (inumber / INOPB(&sblock)) * INOPB(&sblock);
        }
        return (&pbp->b_un.b_dinode[inumber % INOPB(&sblock)]);
}

/*
 * Special purpose version of ginode used to optimize first pass
 * over all the inodes in numerical order.
 */
ino_t nextino, lastinum;
long readcnt, readpercg, fullcnt, inobufsize, partialcnt, partialsize;
struct dinode *inodebuf;

struct dinode *
getnextinode(inumber)
        ino_t inumber;
{
        long size;
        daddr_t dblk;
        static struct dinode *dp;

        if (inumber != nextino++ || inumber > maxino)
                errexit("bad inode number %d to nextinode\n", inumber);
        if (inumber >= lastinum) {
                readcnt++;
                dblk = fsbtodb(&sblock, itod(&sblock, lastinum));
                if (readcnt % readpercg == 0) {
                        size = partialsize;
                        lastinum += partialcnt;
                } else {
                        size = inobufsize;
                        lastinum += fullcnt;
                }
                (void)bread(fsreadfd, (char *)inodebuf, dblk, size); /* ??? */
                dp = inodebuf;
        }
        return (dp++);
}

resetinodebuf()
{

        startinum = 0;
        nextino = 0;
        lastinum = 0;
        readcnt = 0;
        inobufsize = blkroundup(&sblock, INOBUFSIZE);
        fullcnt = inobufsize / sizeof(struct dinode);
        readpercg = sblock.fs_ipg / fullcnt;
        partialcnt = sblock.fs_ipg % fullcnt;
        partialsize = partialcnt * sizeof(struct dinode);
        if (partialcnt != 0) {
                readpercg++;
        } else {
                partialcnt = fullcnt;
                partialsize = inobufsize;
        }
        if (inodebuf == NULL &&
            (inodebuf = (struct dinode *)malloc((unsigned)inobufsize)) == NULL)
                errexit("Cannot allocate space for inode buffer\n");
        while (nextino < ROOTINO)
                (void)getnextinode(nextino);
}

freeinodebuf()
{

        if (inodebuf != NULL)
                free((char *)inodebuf);
        inodebuf = NULL;
}

/*
 * Routines to maintain information about directory inodes.
 * This is built during the first pass and used during the
 * second and third passes.
 *
 * Enter inodes into the cache.
 */
cacheino(dp, inumber)
        register struct dinode *dp;
        ino_t inumber;
{
        register struct inoinfo *inp;
        struct inoinfo **inpp;
        unsigned int blks;

        blks = howmany(dp->di_size, sblock.fs_bsize);
        if (blks > NDADDR)
                blks = NDADDR + NIADDR;
        inp = (struct inoinfo *)
                malloc(sizeof(*inp) + (blks - 1) * sizeof(daddr_t));
        if (inp == NULL)
                return;
        inpp = &inphead[inumber % numdirs];
        inp->i_nexthash = *inpp;
        *inpp = inp;
        inp->i_parent = (ino_t)0;
        inp->i_dotdot = (ino_t)0;
        inp->i_number = inumber;
        inp->i_isize = dp->di_size;
        inp->i_numblks = blks * sizeof(daddr_t);
        bcopy((char *)&dp->di_db[0], (char *)&inp->i_blks[0],
            (size_t)inp->i_numblks);
        if (inplast == listmax) {
                listmax += 100;
                inpsort = (struct inoinfo **)realloc((char *)inpsort,
                    (unsigned)listmax * sizeof(struct inoinfo *));
                if (inpsort == NULL)
                        errexit("cannot increase directory list");
        }
        inpsort[inplast++] = inp;
}

/*
 * Look up an inode cache structure.
 */
struct inoinfo *
getinoinfo(inumber)
        ino_t inumber;
{
        register struct inoinfo *inp;

        for (inp = inphead[inumber % numdirs]; inp; inp = inp->i_nexthash) {
                if (inp->i_number != inumber)
                        continue;
                return (inp);
        }
        errexit("cannot find inode %d\n", inumber);
        return ((struct inoinfo *)0);
}

/*
 * Clean up all the inode cache structure.
 */
inocleanup()
{
        register struct inoinfo **inpp;

        if (inphead == NULL)
                return;
        for (inpp = &inpsort[inplast - 1]; inpp >= inpsort; inpp--)
                free((char *)(*inpp));
        free((char *)inphead);
        free((char *)inpsort);
        inphead = inpsort = NULL;
}

inodirty()
{

        dirty(pbp);
}

clri(idesc, type, flag)
        register struct inodesc *idesc;
        char *type;
        int flag;
{
        register struct dinode *dp;

        dp = ginode(idesc->id_number);
        if (flag == 1) {
                pwarn("%s %s", type,
                    (dp->di_mode & IFMT) == IFDIR ? "DIR" : "FILE");
                pinode(idesc->id_number);
        }
        if (preen || reply("CLEAR") == 1) {
                if (preen)
                        printf(" (CLEARED)\n");
                n_files--;
                (void)ckinode(dp, idesc);
                clearinode(dp);
                statemap[idesc->id_number] = USTATE;
                inodirty();
        }
}

findname(idesc)
        struct inodesc *idesc;
{
        register struct direct *dirp = idesc->id_dirp;

        if (dirp->d_ino != idesc->id_parent)
                return (KEEPON);
        bcopy(dirp->d_name, idesc->id_name, (size_t)dirp->d_namlen + 1);
        return (STOP|FOUND);
}

findino(idesc)
        struct inodesc *idesc;
{
        register struct direct *dirp = idesc->id_dirp;

        if (dirp->d_ino == 0)
                return (KEEPON);
        if (strcmp(dirp->d_name, idesc->id_name) == 0 &&
            dirp->d_ino >= ROOTINO && dirp->d_ino <= maxino) {
                idesc->id_parent = dirp->d_ino;
                return (STOP|FOUND);
        }
        return (KEEPON);
}

pinode(ino)
        ino_t ino;
{
        register struct dinode *dp;
        register char *p;
        struct passwd *pw;
        char *ctime();

        printf(" I=%lu ", ino);
        if (ino < ROOTINO || ino > maxino)
                return;
        dp = ginode(ino);
        printf(" OWNER=");
        if ((pw = getpwuid((int)dp->di_uid)) != 0)
                printf("%s ", pw->pw_name);
        else
                printf("%u ", (unsigned)dp->di_uid);
        printf("MODE=%o\n", dp->di_mode);
        if (preen)
                printf("%s: ", cdevname);
        printf("SIZE=%qu ", dp->di_size);
        p = ctime(&dp->di_mtime.ts_sec);
        printf("MTIME=%12.12s %4.4s ", &p[4], &p[20]);
}

blkerror(ino, type, blk)
        ino_t ino;
        char *type;
        daddr_t blk;
{

        pfatal("%ld %s I=%lu", blk, type, ino);
        printf("\n");
        switch (statemap[ino]) {

        case FSTATE:
                statemap[ino] = FCLEAR;
                return;

        case DSTATE:
                statemap[ino] = DCLEAR;
                return;

        case FCLEAR:
        case DCLEAR:
                return;

        default:
                errexit("BAD STATE %d TO BLKERR", statemap[ino]);
                /* NOTREACHED */
        }
}

/*
 * allocate an unused inode
 */
ino_t
allocino(request, type)
        ino_t request;
        int type;
{
        register ino_t ino;
        register struct dinode *dp;

        if (request == 0)
                request = ROOTINO;
        else if (statemap[request] != USTATE)
                return (0);
        for (ino = request; ino < maxino; ino++)
                if (statemap[ino] == USTATE)
                        break;
        if (ino == maxino)
                return (0);
        switch (type & IFMT) {
        case IFDIR:
                statemap[ino] = DSTATE;
                break;
        case IFREG:
        case IFLNK:
                statemap[ino] = FSTATE;
                break;
        default:
                return (0);
        }
        dp = ginode(ino);
        dp->di_db[0] = allocblk((long)1);
        if (dp->di_db[0] == 0) {
                statemap[ino] = USTATE;
                return (0);
        }
        dp->di_mode = type;
        (void)time(&dp->di_atime.ts_sec);
        dp->di_mtime = dp->di_ctime = dp->di_atime;
        dp->di_size = sblock.fs_fsize;
        dp->di_blocks = btodb(sblock.fs_fsize);
        n_files++;
        inodirty();
        return (ino);
}

/*
 * deallocate an inode
 */
freeino(ino)
        ino_t ino;
{
        struct inodesc idesc;
        extern int pass4check();
        struct dinode *dp;

        bzero((char *)&idesc, sizeof(struct inodesc));
        idesc.id_type = ADDR;
        idesc.id_func = pass4check;
        idesc.id_number = ino;
        dp = ginode(ino);
        (void)ckinode(dp, &idesc);
        clearinode(dp);
        inodirty();
        statemap[ino] = USTATE;
        n_files--;
}