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[unix-history] / sbin / fsck / dir.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[] = "from: @(#)dir.c	5.19 (Berkeley) 7/26/91";*/
static char rcsid[] = "$Id$";
#endif /* not lint */

#include <sys/param.h>
#include <ufs/dinode.h>
#include <ufs/fs.h>
#define KERNEL
#include <ufs/dir.h>
#undef KERNEL
#include <stddef.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, 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);
		idesc->id_dirp = (struct direct *)dbuf;
		if ((n = (*idesc->id_func)(idesc)) & ALTERED) {
			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 blksiz, new_id_filesize;
	int fix, new_id_loc, new_reclen, orig_id_loc, size;

	blksiz = idesc->id_numfrags * sblock.fs_fsize;
	bp = getdirblk(idesc->id_blkno, blksiz);
	orig_id_loc = idesc->id_loc;
	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;
		/*
		 * See below about recursion.
		 */
		new_id_loc = idesc->id_loc + DIRBLKSIZ;
		new_id_filesize = idesc->id_filesize - DIRBLKSIZ;
		fix = dofix(idesc, "DIRECTORY CORRUPTED");
		idesc->id_loc = new_id_loc;
		idesc->id_filesize = new_id_filesize;
		bp = getdirblk(idesc->id_blkno, blksiz);
		dp = (struct direct *)(bp->b_un.b_buf + orig_id_loc);
		dp->d_reclen = DIRBLKSIZ;
		dp->d_ino = 0;
		dp->d_namlen = 0;
		dp->d_name[0] = '\0';
		if (fix)
			dirty(bp);
		return (dp);
	}
dpok:
	if (idesc->id_filesize <= 0 || idesc->id_loc >= blksiz)
		return NULL;
	dp = (struct direct *)(bp->b_un.b_buf + idesc->id_loc);
	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);
		/*
		 * dofix() may recurse here.  Don't let it cause multiple
		 * fixups.
		 */
		new_id_loc = idesc->id_loc + size;
		new_id_filesize = idesc->id_filesize - size;
		new_reclen = dp->d_reclen + size;
		fix = dofix(idesc, "DIRECTORY CORRUPTED");
		idesc->id_loc = new_id_loc;
		idesc->id_filesize = new_id_filesize;
		/*
		 * dofix() calls fsck_readdir() and getdirblk() discards
		 * the lock on bp so bp may now be invalid.
		 */
		bp = getdirblk(idesc->id_blkno, blksiz);
		dp = (struct direct *)(bp->b_un.b_buf + orig_id_loc);
		dp->d_reclen = new_reclen;
		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;
	int spaceleft;

	spaceleft = DIRBLKSIZ - (idesc->id_loc % DIRBLKSIZ);
	if (spaceleft < offsetof(struct direct, d_name))
		return (0);	/* dp is bad; don't use it */
	size = DIRSIZ(dp);
	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 &&
	    dp->d_namlen <= MAXNAMLEN) {
		if (dp->d_ino == 0)
			return (1);
		for (cp = dp->d_name, size = 0; size < dp->d_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(&newent);
	if (dirp->d_ino != 0)
		oldlen = DIRSIZ(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 */
	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)
	struct inodesc *idesc;
{
	register struct direct *dirp = idesc->id_dirp;

	if (bcmp(dirp->d_name, idesc->id_name, (int)dirp->d_namlen + 1))
		return (KEEPON);
	dirp->d_ino = idesc->id_parent;
	return (ALTERED|STOP);
}

linkup(orphan, parentdir)
	ino_t orphan;
	ino_t parentdir;
{
	register struct dinode *dp;
	int lostdir;
	ino_t oldlfdir;
	struct inodesc idesc;
	char tempname[BUFSIZ];
	extern int pass4check();

	bzero((char *)&idesc, sizeof(struct inodesc));
	dp = ginode(orphan);
	lostdir = (dp->di_mode & IFMT) == IFDIR;
	pwarn("UNREF %s ", lostdir ? "DIR" : "FILE");
	pinode(orphan);
	if (preen && dp->di_size == 0)
		return (0);
	if (preen)
		printf(" (RECONNECTED)\n");
	else
		if (reply("RECONNECT") == 0)
			return (0);
	if (lfdir == 0) {
		dp = ginode(ROOTINO);
		idesc.id_name = lfname;
		idesc.id_type = DATA;
		idesc.id_func = findino;
		idesc.id_number = ROOTINO;
		if ((ckinode(dp, &idesc) & FOUND) != 0) {
			lfdir = idesc.id_parent;
		} else {
			pwarn("NO lost+found DIRECTORY");
			if (preen || reply("CREATE")) {
				lfdir = allocdir(ROOTINO, (ino_t)0, lfmode);
				if (lfdir != 0) {
					if (makeentry(ROOTINO, lfdir, lfname) != 0) {
						if (preen)
							printf(" (CREATED)\n");
					} else {
						freedir(lfdir, ROOTINO);
						lfdir = 0;
						if (preen)
							printf("\n");
					}
				}
			}
		}
		if (lfdir == 0) {
			pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY");
			printf("\n\n");
			return (0);
		}
	}
	dp = ginode(lfdir);
	if ((dp->di_mode & IFMT) != IFDIR) {
		pfatal("lost+found IS NOT A DIRECTORY");
		if (reply("REALLOCATE") == 0)
			return (0);
		oldlfdir = lfdir;
		if ((lfdir = allocdir(ROOTINO, (ino_t)0, lfmode)) == 0) {
			pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
			return (0);
		}
		if ((changeino(ROOTINO, lfname, lfdir) & ALTERED) == 0) {
			pfatal("SORRY. CANNOT CREATE lost+found DIRECTORY\n\n");
			return (0);
		}
		inodirty();
		idesc.id_type = ADDR;
		idesc.id_func = pass4check;
		idesc.id_number = oldlfdir;
		adjust(&idesc, lncntp[oldlfdir] + 1);
		lncntp[oldlfdir] = 0;
		dp = ginode(lfdir);
	}
	if (statemap[lfdir] != DFOUND) {
		pfatal("SORRY. NO lost+found DIRECTORY\n\n");
		return (0);
	}
	(void)lftempname(tempname, orphan);
	if (makeentry(lfdir, orphan, tempname) == 0) {
		pfatal("SORRY. NO SPACE IN lost+found DIRECTORY");
		printf("\n\n");
		return (0);
	}
	lncntp[orphan]--;
	if (lostdir) {
		if ((changeino(orphan, "..", lfdir) & ALTERED) == 0 &&
		    parentdir != (ino_t)-1)
			(void)makeentry(orphan, lfdir, "..");
		dp = ginode(lfdir);
		dp->di_nlink++;
		inodirty();
		lncntp[lfdir]++;
		pwarn("DIR I=%lu CONNECTED. ", orphan);
		if (parentdir != (ino_t)-1)
			printf("PARENT WAS I=%lu\n", parentdir);
		if (preen == 0)
			printf("\n");
	}
	return (1);
}

/*
 * fix an entry in a directory.
 */
changeino(dir, name, newnum)
	ino_t dir;
	char *name;
	ino_t newnum;
{
	struct inodesc idesc;

	bzero((char *)&idesc, sizeof(struct inodesc));
	idesc.id_type = DATA;
	idesc.id_func = chgino;
	idesc.id_number = dir;
	idesc.id_fix = DONTKNOW;
	idesc.id_name = name;
	idesc.id_parent = newnum;	/* new value for name */
	return (ckinode(ginode(dir), &idesc));
}

/*
 * make an entry in a directory
 */
makeentry(parent, ino, name)
	ino_t parent, ino;
	char *name;
{
	struct dinode *dp;
	struct inodesc idesc;
	char pathbuf[MAXPATHLEN + 1];
	
	if (parent < ROOTINO || parent >= maxino ||
	    ino < ROOTINO || ino >= maxino)
		return (0);
	bzero((char *)&idesc, sizeof(struct inodesc));
	idesc.id_type = DATA;
	idesc.id_func = mkentry;
	idesc.id_number = parent;
	idesc.id_parent = ino;	/* this is the inode to enter */
	idesc.id_fix = DONTKNOW;
	idesc.id_name = name;
	dp = ginode(parent);
	if (dp->di_size % DIRBLKSIZ) {
		dp->di_size = roundup(dp->di_size, DIRBLKSIZ);
		inodirty();
	}
	if ((ckinode(dp, &idesc) & ALTERED) != 0)
		return (1);
	getpathname(pathbuf, parent, parent);
	dp = ginode(parent);
	if (expanddir(dp, pathbuf) == 0)
		return (0);
	return (ckinode(dp, &idesc) & ALTERED);
}

/*
 * Attempt to expand the size of a directory
 */
expanddir(dp, name)
	register struct dinode *dp;
	char *name;
{
	daddr_t lastbn, newblk;
	register struct bufarea *bp;
	char *cp, firstblk[DIRBLKSIZ];

	lastbn = lblkno(&sblock, dp->di_size);
	if (lastbn >= NDADDR - 1 || dp->di_db[lastbn] == 0 || dp->di_size == 0)
		return (0);
	if ((newblk = allocblk(sblock.fs_frag)) == 0)
		return (0);
	dp->di_db[lastbn + 1] = dp->di_db[lastbn];
	dp->di_db[lastbn] = newblk;
	dp->di_size += sblock.fs_bsize;
	dp->di_blocks += btodb(sblock.fs_bsize);
	bp = getdirblk(dp->di_db[lastbn + 1],
		(long)dblksize(&sblock, dp, lastbn + 1));
	if (bp->b_errs)
		goto bad;
	bcopy(bp->b_un.b_buf, firstblk, DIRBLKSIZ);
	bp = getdirblk(newblk, sblock.fs_bsize);
	if (bp->b_errs)
		goto bad;
	bcopy(firstblk, bp->b_un.b_buf, DIRBLKSIZ);
	for (cp = &bp->b_un.b_buf[DIRBLKSIZ];
	     cp < &bp->b_un.b_buf[sblock.fs_bsize];
	     cp += DIRBLKSIZ)
		bcopy((char *)&emptydir, cp, sizeof emptydir);
	dirty(bp);
	bp = getdirblk(dp->di_db[lastbn + 1],
		(long)dblksize(&sblock, dp, lastbn + 1));
	if (bp->b_errs)
		goto bad;
	bcopy((char *)&emptydir, bp->b_un.b_buf, sizeof emptydir);
	pwarn("NO SPACE LEFT IN %s", name);
	if (preen)
		printf(" (EXPANDED)\n");
	else if (reply("EXPAND") == 0)
		goto bad;
	dirty(bp);
	inodirty();
	return (1);
bad:
	dp->di_db[lastbn] = dp->di_db[lastbn + 1];
	dp->di_db[lastbn + 1] = 0;
	dp->di_size -= sblock.fs_bsize;
	dp->di_blocks -= btodb(sblock.fs_bsize);
	freeblk(newblk, sblock.fs_frag);
	return (0);
}

/*
 * allocate a new directory
 */
allocdir(parent, request, mode)
	ino_t parent, request;
	int mode;
{
	ino_t ino;
	char *cp;
	struct dinode *dp;
	register struct bufarea *bp;

	ino = allocino(request, IFDIR|mode);
	dirhead.dot_ino = ino;
	dirhead.dotdot_ino = parent;
	dp = ginode(ino);
	bp = getdirblk(dp->di_db[0], sblock.fs_fsize);
	if (bp->b_errs) {
		freeino(ino);
		return (0);
	}
	bcopy((char *)&dirhead, bp->b_un.b_buf, sizeof dirhead);
	for (cp = &bp->b_un.b_buf[DIRBLKSIZ];
	     cp < &bp->b_un.b_buf[sblock.fs_fsize];
	     cp += DIRBLKSIZ)
		bcopy((char *)&emptydir, cp, sizeof emptydir);
	dirty(bp);
	dp->di_nlink = 2;
	inodirty();
	if (ino == ROOTINO) {
		lncntp[ino] = dp->di_nlink;
		cacheino(dp, ino);
		return(ino);
	}
	if (statemap[parent] != DSTATE && statemap[parent] != DFOUND) {
		freeino(ino);
		return (0);
	}
	cacheino(dp, ino);
	statemap[ino] = statemap[parent];
	if (statemap[ino] == DSTATE) {
		lncntp[ino] = dp->di_nlink;
		lncntp[parent]++;
	}
	dp = ginode(parent);
	dp->di_nlink++;
	inodirty();
	return (ino);
}

/*
 * free a directory inode
 */
freedir(ino, parent)
	ino_t ino, parent;
{
	struct dinode *dp;

	if (ino != parent) {
		dp = ginode(parent);
		dp->di_nlink--;
		inodirty();
	}
	freeino(ino);
}

/*
 * generate a temporary name for the lost+found directory.
 */
lftempname(bufp, ino)
	char *bufp;
	ino_t ino;
{
	register ino_t in;
	register char *cp;
	int namlen;

	cp = bufp + 2;
	for (in = maxino; in > 0; in /= 10)
		cp++;
	*--cp = 0;
	namlen = cp - bufp;
	in = ino;
	while (cp > bufp) {
		*--cp = (in % 10) + '0';
		in /= 10;
	}
	*cp = '#';
	return (namlen);
}

/*
 * Get a directory block.
 * Insure that it is held until another is requested.
 */
struct bufarea *
getdirblk(blkno, size)
	daddr_t blkno;
	long size;
{

	if (pdirbp != 0)
		pdirbp->b_flags &= ~B_INUSE;
	pdirbp = getdatablk(blkno, size);
	return (pdirbp);
}