usr/src/sbin/fsck/utilities.c

/*
 * Copyright (c) 1980, 1986 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.
 */

#ifndef lint
static char sccsid[] = "@(#)utilities.c 5.30 (Berkeley) 7/26/91";
#endif /* not lint */

#include <sys/param.h>
#include <ufs/dinode.h>
#include <ufs/fs.h>
#include <ufs/dir.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "fsck.h"

long    diskreads, totalreads;  /* Disk cache statistics */
long    lseek();

ftypeok(dp)
        struct dinode *dp;
{
        switch (dp->di_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", dp->di_mode);
                return (0);
        }
}

reply(question)
        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);
                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))
                                return (0);
        } while (c != 'y' && c != 'Y' && c != 'n' && c != 'N');
        printf("\n");
        if (c == 'y' || c == 'Y')
                return (1);
        return (0);
}

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

        pbp = pdirbp = (struct bufarea *)0;
        bufp = malloc((unsigned int)sblock.fs_bsize);
        if (bufp == 0)
                errexit("cannot allocate buffer pool\n");
        cgblk.b_un.b_buf = bufp;
        initbarea(&cgblk);
        bufhead.b_next = bufhead.b_prev = &bufhead;
        bufcnt = MAXBUFSPACE / sblock.fs_bsize;
        if (bufcnt < MINBUFS)
                bufcnt = MINBUFS;
        for (i = 0; i < bufcnt; i++) {
                bp = (struct bufarea *)malloc(sizeof(struct bufarea));
                bufp = malloc((unsigned int)sblock.fs_bsize);
                if (bp == NULL || bufp == NULL) {
                        if (i >= MINBUFS)
                                break;
                        errexit("cannot allocate buffer pool\n");
                }
                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(blkno, size)
        daddr_t blkno;
        long size;
{
        register struct bufarea *bp;

        for (bp = bufhead.b_next; bp != &bufhead; bp = bp->b_next)
                if (bp->b_bno == 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\n");
        getblk(bp, blkno, size);
        /* fall through */
foundit:
        totalreads++;
        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(bp, blk, size)
        register struct bufarea *bp;
        daddr_t blk;
        long size;
{
        daddr_t dblk;

        dblk = fsbtodb(&sblock, blk);
        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;
        }
}

flush(fd, bp)
        int fd;
        register struct bufarea *bp;
{
        register int i, j;

        if (!bp->b_dirty)
                return;
        if (bp->b_errs != 0)
                pfatal("WRITING %sZERO'ED BLOCK %d TO DISK\n",
                    (bp->b_errs == bp->b_size / dev_bsize) ? "" : "PARTIALLY ",
                    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++) {
                bwrite(fswritefd, (char *)sblock.fs_csp[j],
                    fsbtodb(&sblock, sblock.fs_csaddr + j * sblock.fs_frag),
                    sblock.fs_cssize - i < sblock.fs_bsize ?
                    sblock.fs_cssize - i : sblock.fs_bsize);
        }
}

rwerror(mesg, blk)
        char *mesg;
        daddr_t blk;
{

        if (preen == 0)
                printf("\n");
        pfatal("CANNOT %s: BLK %ld", mesg, blk);
        if (reply("CONTINUE") == 0)
                errexit("Program terminated\n");
}

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

        flush(fswritefd, &sblk);
        if (havesb && sblk.b_bno != SBOFF / dev_bsize &&
            !preen && reply("UPDATE STANDARD SUPERBLOCK")) {
                sblk.b_bno = SBOFF / dev_bsize;
                sbdirty();
                flush(fswritefd, &sblk);
        }
        flush(fswritefd, &cgblk);
        free(cgblk.b_un.b_buf);
        for (bp = bufhead.b_prev; 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\n", bufhead.b_size - cnt);
        pbp = pdirbp = (struct bufarea *)0;
        if (debug)
                printf("cache missed %ld of %ld (%d%%)\n", diskreads,
                    totalreads, (int)(diskreads * 100 / totalreads));
        (void)close(fsreadfd);
        (void)close(fswritefd);
}

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

        if (lseek(fd, blk * dev_bsize, 0) < 0)
                rwerror("SEEK", blk);
        else if (read(fd, buf, (int)size) == size)
                return (0);
        rwerror("READ", blk);
        if (lseek(fd, blk * dev_bsize, 0) < 0)
                rwerror("SEEK", blk);
        errs = 0;
        bzero(buf, (size_t)size);
        printf("THE FOLLOWING DISK SECTORS COULD NOT BE READ:");
        for (cp = buf, i = 0; i < size; i += secsize, cp += secsize) {
                if (read(fd, cp, (int)secsize) != secsize) {
                        (void)lseek(fd, blk * dev_bsize + i + secsize, 0);
                        if (secsize != dev_bsize && dev_bsize != 1)
                                printf(" %ld (%ld),",
                                    (blk * dev_bsize + i) / secsize,
                                    blk + i / dev_bsize);
                        else
                                printf(" %ld,", blk + i / dev_bsize);
                        errs++;
                }
        }
        printf("\n");
        return (errs);
}

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

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

/*
 * allocate a data block with the specified number of fragments
 */
allocblk(frags)
        long frags;
{
        register int i, j, k;

        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;
                        }
                        for (k = 0; k < frags; k++)
                                setbmap(i + j + k);
                        n_blks += frags;
                        return (i + j);
                }
        }
        return (0);
}

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

        idesc.id_blkno = blkno;
        idesc.id_numfrags = frags;
        (void)pass4check(&idesc);
}

/*
 * Find a pathname
 */
getpathname(namebuf, curdir, ino)
        char *namebuf;
        ino_t curdir, ino;
{
        int len;
        register char *cp;
        struct inodesc idesc;
        static int busy = 0;
        extern int findname();

        if (busy ||
            (statemap[curdir] != DSTATE && statemap[curdir] != DFOUND)) {
                (void)strcpy(namebuf, "?");
                return;
        }
        busy = 1;
        bzero((char *)&idesc, 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 != 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;
                bcopy(namebuf, cp, (size_t)len);
                *--cp = '/';
                if (cp < &namebuf[MAXNAMLEN])
                        break;
                ino = idesc.id_number;
        }
        busy = 0;
        if (ino != ROOTINO)
                *--cp = '?';
        bcopy(cp, namebuf, (size_t)(&namebuf[MAXPATHLEN] - cp));
}

void
catch()
{
        ckfini();
        exit(12);
}

/*
 * When preening, allow a single quit to signal
 * a special exit after filesystem checks complete
 * so that reboot sequence may be interrupted.
 */
void
catchquit()
{
        extern returntosingle;

        printf("returning to single-user after filesystem check\n");
        returntosingle = 1;
        (void)signal(SIGQUIT, SIG_DFL);
}

/*
 * Ignore a single quit signal; wait and flush just in case.
 * Used by child processes in preen.
 */
void
voidquit()
{

        sleep(1);
        (void)signal(SIGQUIT, SIG_IGN);
        (void)signal(SIGQUIT, SIG_DFL);
}

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

        switch (idesc->id_fix) {

        case DONTKNOW:
                if (idesc->id_type == DATA)
                        direrror(idesc->id_number, msg);
                else
                        pwarn(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\n", idesc->id_fix);
        }
        /* NOTREACHED */
}

/* VARARGS1 */
errexit(s1, s2, s3, s4)
        char *s1;
{
        printf(s1, s2, s3, s4);
        exit(8);
}

/*
 * An unexpected inconsistency occured.
 * Die if preening, otherwise just print message and continue.
 */
/* VARARGS1 */
pfatal(s, a1, a2, a3)
        char *s;
{

        if (preen) {
                printf("%s: ", devname);
                printf(s, a1, a2, a3);
                printf("\n");
                printf("%s: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.\n",
                        devname);
                exit(8);
        }
        printf(s, a1, a2, a3);
}

/*
 * Pwarn just prints a message when not preening,
 * or a warning (preceded by filename) when preening.
 */
/* VARARGS1 */
pwarn(s, a1, a2, a3, a4, a5, a6)
        char *s;
{

        if (preen)
                printf("%s: ", devname);
        printf(s, a1, a2, a3, a4, a5, a6);
}

#ifndef lint
/*
 * Stub for routines from kernel.
 */
panic(s)
        char *s;
{

        pfatal("INTERNAL INCONSISTENCY:");
        errexit(s);
}
#endif