dir.c

早期freebsd实现

	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;
	if (newinofmt)
		dirp->d_type = typemap[idesc->id_parent];
	else
		dirp->d_type = 0;
	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;
	struct dirtemplate *dirp;

	ino = allocino(request, IFDIR|mode);
	if (newinofmt)
		dirp = &dirhead;
	else
		dirp = (struct dirtemplate *)&odirhead;
	dirp->dot_ino = ino;
	dirp->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 *)dirp, bp->b_un.b_buf, sizeof(struct dirtemplate));
	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);
}