dir.c

早期freebsd实现

/*
 * 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.
 */

#ifndef lint
static char sccsid[] = "@(#)dir.c	8.1 (Berkeley) 6/5/93";
#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 <stdlib.h>
#include <string.h>
#include "fsck.h"

char	*lfname = "lost+found";
int	lfmode = 01777;
struct	dirtemplate emptydir = { 0, DIRBLKSIZ };
struct	dirtemplate dirhead = {
	0, 12, DT_DIR, 1, ".",
	0, DIRBLKSIZ - 12, DT_DIR, 2, ".."
};
struct	odirtemplate odirhead = {
	0, 12, 1, ".",
	0, DIRBLKSIZ - 12, 2, ".."
};

struct direct	*fsck_readdir();
struct bufarea	*getdirblk();

/*
 * Propagate connected state through the tree.
 */
propagate()
{
	register struct inoinfo **inpp, *inp;
	struct inoinfo **inpend;
	long change;

	inpend = &inpsort[inplast];
	do {
		change = 0;
		for (inpp = inpsort; inpp < inpend; inpp++) {
			inp = *inpp;
			if (inp->i_parent == 0)
				continue;
			if (statemap[inp->i_parent] == DFOUND &&
			    statemap[inp->i_number] == DSTATE) {
				statemap[inp->i_number] = DFOUND;
				change++;
			}
		}
	} while (change > 0);
}

/*
 * Scan each entry in a directory block.
 */
dirscan(idesc)
	register struct inodesc *idesc;
{
	register struct direct *dp;
	register struct bufarea *bp;
	int dsize, n;
	long blksiz;
	char dbuf[DIRBLKSIZ];

	if (idesc->id_type != DATA)
		errexit("wrong type to dirscan %d\n", idesc->id_type);
	if (idesc->id_entryno == 0 &&
	    (idesc->id_filesize & (DIRBLKSIZ - 1)) != 0)
		idesc->id_filesize = roundup(idesc->id_filesize, DIRBLKSIZ);
	blksiz = idesc->id_numfrags * sblock.fs_fsize;
	if (chkrange(idesc->id_blkno, idesc->id_numfrags)) {
		idesc->id_filesize -= blksiz;
		return (SKIP);
	}
	idesc->id_loc = 0;
	for (dp = fsck_readdir(idesc); dp != NULL; dp = fsck_readdir(idesc)) {
		dsize = dp->d_reclen;
		bcopy((char *)dp, dbuf, (size_t)dsize);
#		if (BYTE_ORDER == LITTLE_ENDIAN)
			if (!newinofmt) {
				struct direct *tdp = (struct direct *)dbuf;
				u_char tmp;

				tmp = tdp->d_namlen;
				tdp->d_namlen = tdp->d_type;
				tdp->d_type = tmp;
			}
#		endif
		idesc->id_dirp = (struct direct *)dbuf;
		if ((n = (*idesc->id_func)(idesc)) & ALTERED) {
#			if (BYTE_ORDER == LITTLE_ENDIAN)
				if (!newinofmt && !doinglevel2) {
					struct direct *tdp;
					u_char tmp;

					tdp = (struct direct *)dbuf;
					tmp = tdp->d_namlen;
					tdp->d_namlen = tdp->d_type;
					tdp->d_type = tmp;
				}
#			endif
			bp = getdirblk(idesc->id_blkno, blksiz);
			bcopy(dbuf, bp->b_un.b_buf + idesc->id_loc - dsize,
			    (size_t)dsize);
			dirty(bp);
			sbdirty();
		}
		if (n & STOP) 
			return (n);
	}
	return (idesc->id_filesize > 0 ? KEEPON : STOP);
}

/*
 * get next entry in a directory.
 */
struct direct *
fsck_readdir(idesc)
	register struct inodesc *idesc;
{
	register struct direct *dp, *ndp;
	register struct bufarea *bp;
	long size, blksiz, fix, dploc;

	blksiz = idesc->id_numfrags * sblock.fs_fsize;
	bp = getdirblk(idesc->id_blkno, blksiz);
	if (idesc->id_loc % DIRBLKSIZ == 0 && idesc->id_filesize > 0 &&
	    idesc->id_loc < blksiz) {
		dp = (struct direct *)(bp->b_un.b_buf + idesc->id_loc);
		if (dircheck(idesc, dp))
			goto dpok;
		fix = dofix(idesc, "DIRECTORY CORRUPTED");
		bp = getdirblk(idesc->id_blkno, blksiz);
		dp = (struct direct *)(bp->b_un.b_buf + idesc->id_loc);
		dp->d_reclen = DIRBLKSIZ;
		dp->d_ino = 0;
		dp->d_type = 0;
		dp->d_namlen = 0;
		dp->d_name[0] = '\0';
		if (fix)
			dirty(bp);
		idesc->id_loc += DIRBLKSIZ;
		idesc->id_filesize -= DIRBLKSIZ;
		return (dp);
	}
dpok:
	if (idesc->id_filesize <= 0 || idesc->id_loc >= blksiz)
		return NULL;
	dploc = idesc->id_loc;
	dp = (struct direct *)(bp->b_un.b_buf + dploc);
	idesc->id_loc += dp->d_reclen;
	idesc->id_filesize -= dp->d_reclen;
	if ((idesc->id_loc % DIRBLKSIZ) == 0)
		return (dp);
	ndp = (struct direct *)(bp->b_un.b_buf + idesc->id_loc);
	if (idesc->id_loc < blksiz && idesc->id_filesize > 0 &&
	    dircheck(idesc, ndp) == 0) {
		size = DIRBLKSIZ - (idesc->id_loc % DIRBLKSIZ);
		idesc->id_loc += size;
		idesc->id_filesize -= size;
		fix = dofix(idesc, "DIRECTORY CORRUPTED");
		bp = getdirblk(idesc->id_blkno, blksiz);
		dp = (struct direct *)(bp->b_un.b_buf + dploc);
		dp->d_reclen += size;
		if (fix)
			dirty(bp);
	}
	return (dp);
}

/*
 * Verify that a directory entry is valid.
 * This is a superset of the checks made in the kernel.
 */
dircheck(idesc, dp)
	struct inodesc *idesc;
	register struct direct *dp;
{
	register int size;
	register char *cp;
	u_char namlen, type;
	int spaceleft;

	size = DIRSIZ(!newinofmt, dp);
	spaceleft = DIRBLKSIZ - (idesc->id_loc % DIRBLKSIZ);
#	if (BYTE_ORDER == LITTLE_ENDIAN)
		if (!newinofmt) {
			type = dp->d_namlen;
			namlen = dp->d_type;
		} else {
			namlen = dp->d_namlen;
			type = dp->d_type;
		}
#	else
		namlen = dp->d_namlen;
		type = dp->d_type;
#	endif
	if (dp->d_ino < maxino &&
	    dp->d_reclen != 0 &&
	    dp->d_reclen <= spaceleft &&
	    (dp->d_reclen & 0x3) == 0 &&
	    dp->d_reclen >= size &&
	    idesc->id_filesize >= size &&
	    namlen <= MAXNAMLEN &&
	    type <= 15) {
		if (dp->d_ino == 0)
			return (1);
		for (cp = dp->d_name, size = 0; size < namlen; size++)
			if (*cp == 0 || (*cp++ == '/'))
				return (0);
		if (*cp == 0)
			return (1);
	}
	return (0);
}

direrror(ino, errmesg)
	ino_t ino;
	char *errmesg;
{

	fileerror(ino, ino, errmesg);
}

fileerror(cwd, ino, errmesg)
	ino_t cwd, ino;
	char *errmesg;
{
	register struct dinode *dp;
	char pathbuf[MAXPATHLEN + 1];

	pwarn("%s ", errmesg);
	pinode(ino);
	printf("\n");
	getpathname(pathbuf, cwd, ino);
	if (ino < ROOTINO || ino > maxino) {
		pfatal("NAME=%s\n", pathbuf);
		return;
	}
	dp = ginode(ino);
	if (ftypeok(dp))
		pfatal("%s=%s\n",
		    (dp->di_mode & IFMT) == IFDIR ? "DIR" : "FILE", pathbuf);
	else
		pfatal("NAME=%s\n", pathbuf);
}

adjust(idesc, lcnt)
	register struct inodesc *idesc;
	short lcnt;
{
	register struct dinode *dp;

	dp = ginode(idesc->id_number);
	if (dp->di_nlink == lcnt) {
		if (linkup(idesc->id_number, (ino_t)0) == 0)
			clri(idesc, "UNREF", 0);
	} else {
		pwarn("LINK COUNT %s", (lfdir == idesc->id_number) ? lfname :
			((dp->di_mode & IFMT) == IFDIR ? "DIR" : "FILE"));
		pinode(idesc->id_number);
		printf(" COUNT %d SHOULD BE %d",
			dp->di_nlink, dp->di_nlink - lcnt);
		if (preen) {
			if (lcnt < 0) {
				printf("\n");
				pfatal("LINK COUNT INCREASING");
			}
			printf(" (ADJUSTED)\n");
		}
		if (preen || reply("ADJUST") == 1) {
			dp->di_nlink -= lcnt;
			inodirty();
		}
	}
}

mkentry(idesc)
	struct inodesc *idesc;
{
	register struct direct *dirp = idesc->id_dirp;
	struct direct newent;
	int newlen, oldlen;

	newent.d_namlen = strlen(idesc->id_name);
	newlen = DIRSIZ(0, &newent);
	if (dirp->d_ino != 0)
		oldlen = DIRSIZ(0, dirp);
	else
		oldlen = 0;
	if (dirp->d_reclen - oldlen < newlen)
		return (KEEPON);
	newent.d_reclen = dirp->d_reclen - oldlen;
	dirp->d_reclen = oldlen;
	dirp = (struct direct *)(((char *)dirp) + oldlen);
	dirp->d_ino = idesc->id_parent;	/* ino to be entered is in id_parent */
	if (newinofmt)
		dirp->d_type = typemap[idesc->id_parent];
	else
		dirp->d_type = 0;
	dirp->d_reclen = newent.d_reclen;
	dirp->d_namlen = newent.d_namlen;
	bcopy(idesc->id_name, dirp->d_name, (size_t)dirp->d_namlen + 1);
	return (ALTERED|STOP);
}

chgino(idesc)