newfs.c

早期freebsd实现

		/* Bail if target special is mounted */
		n = getmntinfo(&mp, MNT_NOWAIT);
		if (n == 0)
			fatal("%s: getmntinfo: %s", special, strerror(errno));

		len = sizeof(_PATH_DEV) - 1;
		s1 = special;
		if (strncmp(_PATH_DEV, s1, len) == 0)
			s1 += len;

		while (--n >= 0) {
			s2 = mp->f_mntfromname;
			if (strncmp(_PATH_DEV, s2, len) == 0) {
				s2 += len - 1;
				*s2 = 'r';
			}
			if (strcmp(s1, s2) == 0 || strcmp(s1, &s2[1]) == 0)
				fatal("%s is mounted on %s",
				    special, mp->f_mntonname);
			++mp;
		}
	}
	if (mfs && disktype != NULL) {
		lp = (struct disklabel *)getdiskbyname(disktype);
		if (lp == NULL)
			fatal("%s: unknown disk type", disktype);
		pp = &lp->d_partitions[1];
	} else {
		fsi = open(special, O_RDONLY);
		if (fsi < 0)
			fatal("%s: %s", special, strerror(errno));
		if (fstat(fsi, &st) < 0)
			fatal("%s: %s", special, strerror(errno));
		if ((st.st_mode & S_IFMT) != S_IFCHR && !mfs)
			printf("%s: %s: not a character-special device\n",
			    progname, special);
		cp = index(argv[0], '\0') - 1;
		if (cp == 0 || (*cp < 'a' || *cp > 'h') && !isdigit(*cp))
			fatal("%s: can't figure out file system partition",
			    argv[0]);
#ifdef COMPAT
		if (!mfs && disktype == NULL)
			disktype = argv[1];
#endif
		lp = getdisklabel(special, fsi);
		if (isdigit(*cp))
			pp = &lp->d_partitions[0];
		else
			pp = &lp->d_partitions[*cp - 'a'];
		if (pp->p_size == 0)
			fatal("%s: `%c' partition is unavailable",
			    argv[0], *cp);
		if (pp->p_fstype == FS_BOOT)
			fatal("%s: `%c' partition overlaps boot program",
			      argv[0], *cp);
	}
	if (fssize == 0)
		fssize = pp->p_size;
	if (fssize > pp->p_size && !mfs)
	       fatal("%s: maximum file system size on the `%c' partition is %d",
			argv[0], *cp, pp->p_size);
	if (rpm == 0) {
		rpm = lp->d_rpm;
		if (rpm <= 0)
			rpm = 3600;
	}
	if (ntracks == 0) {
		ntracks = lp->d_ntracks;
		if (ntracks <= 0)
			fatal("%s: no default #tracks", argv[0]);
	}
	if (nsectors == 0) {
		nsectors = lp->d_nsectors;
		if (nsectors <= 0)
			fatal("%s: no default #sectors/track", argv[0]);
	}
	if (sectorsize == 0) {
		sectorsize = lp->d_secsize;
		if (sectorsize <= 0)
			fatal("%s: no default sector size", argv[0]);
	}
	if (trackskew == -1) {
		trackskew = lp->d_trackskew;
		if (trackskew < 0)
			trackskew = 0;
	}
	if (interleave == 0) {
		interleave = lp->d_interleave;
		if (interleave <= 0)
			interleave = 1;
	}
	if (fsize == 0) {
		fsize = pp->p_fsize;
		if (fsize <= 0)
			fsize = MAX(DFL_FRAGSIZE, lp->d_secsize);
	}
	if (bsize == 0) {
		bsize = pp->p_frag * pp->p_fsize;
		if (bsize <= 0)
			bsize = MIN(DFL_BLKSIZE, 8 * fsize);
	}
	/*
	 * Maxcontig sets the default for the maximum number of blocks
	 * that may be allocated sequentially. With filesystem clustering
	 * it is possible to allocate contiguous blocks up to the maximum
	 * transfer size permitted by the controller or buffering.
	 */
	if (maxcontig == 0)
		maxcontig = MAX(1, MIN(MAXPHYS, MAXBSIZE) / bsize - 1);
	if (density == 0)
		density = NFPI * fsize;
	if (minfree < MINFREE && opt != FS_OPTSPACE) {
		fprintf(stderr, "Warning: changing optimization to space ");
		fprintf(stderr, "because minfree is less than %d%%\n", MINFREE);
		opt = FS_OPTSPACE;
	}
	if (trackspares == -1) {
		trackspares = lp->d_sparespertrack;
		if (trackspares < 0)
			trackspares = 0;
	}
	nphyssectors = nsectors + trackspares;
	if (cylspares == -1) {
		cylspares = lp->d_sparespercyl;
		if (cylspares < 0)
			cylspares = 0;
	}
	secpercyl = nsectors * ntracks - cylspares;
	if (secpercyl != lp->d_secpercyl)
		fprintf(stderr, "%s (%d) %s (%lu)\n",
			"Warning: calculated sectors per cylinder", secpercyl,
			"disagrees with disk label", lp->d_secpercyl);
	if (maxbpg == 0)
		maxbpg = MAXBLKPG(bsize);
	headswitch = lp->d_headswitch;
	trackseek = lp->d_trkseek;
#ifdef notdef /* label may be 0 if faked up by kernel */
	bbsize = lp->d_bbsize;
	sbsize = lp->d_sbsize;
#endif
	oldpartition = *pp;
#ifdef tahoe
	realsectorsize = sectorsize;
	if (sectorsize != DEV_BSIZE) {		/* XXX */
		int secperblk = DEV_BSIZE / sectorsize;

		sectorsize = DEV_BSIZE;
		nsectors /= secperblk;
		nphyssectors /= secperblk;
		secpercyl /= secperblk;
		fssize /= secperblk;
		pp->p_size /= secperblk;
	}
#endif
	mkfs(pp, special, fsi, fso);
#ifdef tahoe
	if (realsectorsize != DEV_BSIZE)
		pp->p_size *= DEV_BSIZE / realsectorsize;
#endif
	if (!Nflag && bcmp(pp, &oldpartition, sizeof(oldpartition)))
		rewritelabel(special, fso, lp);
	if (!Nflag)
		close(fso);
	close(fsi);
#ifdef MFS
	if (mfs) {
		struct mfs_args args;

		sprintf(buf, "mfs:%d", getpid());
		args.fspec = buf;
		args.export.ex_root = -2;
		if (mntflags & MNT_RDONLY)
			args.export.ex_flags = MNT_EXRDONLY;
		else
			args.export.ex_flags = 0;
		args.base = membase;
		args.size = fssize * sectorsize;
		if (mount(MOUNT_MFS, argv[1], mntflags, &args) < 0)
			fatal("%s: %s", argv[1], strerror(errno));
	}
#endif
	exit(0);
}

#ifdef COMPAT
char lmsg[] = "%s: can't read disk label; disk type must be specified";
#else
char lmsg[] = "%s: can't read disk label";
#endif

struct disklabel *
getdisklabel(s, fd)
	char *s;
	int fd;
{
	static struct disklabel lab;

	if (ioctl(fd, DIOCGDINFO, (char *)&lab) < 0) {
#ifdef COMPAT
		if (disktype) {
			struct disklabel *lp, *getdiskbyname();

			unlabeled++;
			lp = getdiskbyname(disktype);
			if (lp == NULL)
				fatal("%s: unknown disk type", disktype);
			return (lp);
		}
#endif
		warn("ioctl (GDINFO)");
		fatal(lmsg, s);
	}
	return (&lab);
}

rewritelabel(s, fd, lp)
	char *s;
	int fd;
	register struct disklabel *lp;
{
#ifdef COMPAT
	if (unlabeled)
		return;
#endif
	lp->d_checksum = 0;
	lp->d_checksum = dkcksum(lp);
	if (ioctl(fd, DIOCWDINFO, (char *)lp) < 0) {
		warn("ioctl (WDINFO)");
		fatal("%s: can't rewrite disk label", s);
	}
#if vax
	if (lp->d_type == DTYPE_SMD && lp->d_flags & D_BADSECT) {
		register i;
		int cfd;
		daddr_t alt;
		char specname[64];
		char blk[1024];
		char *cp;

		/*
		 * Make name for 'c' partition.
		 */
		strcpy(specname, s);
		cp = specname + strlen(specname) - 1;
		if (!isdigit(*cp))
			*cp = 'c';
		cfd = open(specname, O_WRONLY);
		if (cfd < 0)
			fatal("%s: %s", specname, strerror(errno));
		bzero(blk, sizeof(blk));
		*(struct disklabel *)(blk + LABELOFFSET) = *lp;
		alt = lp->d_ncylinders * lp->d_secpercyl - lp->d_nsectors;
		for (i = 1; i < 11 && i < lp->d_nsectors; i += 2) {
			if (lseek(cfd, (off_t)(alt + i) * lp->d_secsize,
			    L_SET) == -1)
				fatal("lseek to badsector area: %s",
				    strerror(errno));
			if (write(cfd, blk, lp->d_secsize) < lp->d_secsize)
				warn("alternate label %d write", i/2);
		}
		close(cfd);
	}
#endif
}

/*VARARGS*/
void
#if __STDC__
fatal(const char *fmt, ...)
#else
fatal(fmt, va_alist)
	char *fmt;
	va_dcl
#endif
{
	va_list ap;

#if __STDC__
	va_start(ap, fmt);
#else
	va_start(ap);
#endif
	if (fcntl(STDERR_FILENO, F_GETFL) < 0) {
		openlog(progname, LOG_CONS, LOG_DAEMON);
		vsyslog(LOG_ERR, fmt, ap);
		closelog();
	} else {
		vwarnx(fmt, ap);
	}
	va_end(ap);
	exit(1);
	/*NOTREACHED*/
}

usage()
{
	if (mfs) {
		fprintf(stderr,
		    "usage: %s [ -fsoptions ] special-device mount-point\n",
			progname);
	} else
		fprintf(stderr,
		    "usage: %s [ -fsoptions ] special-device%s\n",
		    progname,
#ifdef COMPAT
		    " [device-type]");
#else
		    "");
#endif
	fprintf(stderr, "where fsoptions are:\n");
	fprintf(stderr,
	    "\t-N do not create file system, just print out parameters\n");
	fprintf(stderr, "\t-O create a 4.3BSD format filesystem\n");
	fprintf(stderr, "\t-S sector size\n");
#ifdef COMPAT
	fprintf(stderr, "\t-T disktype\n");
#endif
	fprintf(stderr, "\t-a maximum contiguous blocks\n");
	fprintf(stderr, "\t-b block size\n");
	fprintf(stderr, "\t-c cylinders/group\n");
	fprintf(stderr, "\t-d rotational delay between contiguous blocks\n");
	fprintf(stderr, "\t-e maximum blocks per file in a cylinder group\n");
	fprintf(stderr, "\t-f frag size\n");
	fprintf(stderr, "\t-i number of bytes per inode\n");
	fprintf(stderr, "\t-k sector 0 skew, per track\n");
	fprintf(stderr, "\t-l hardware sector interleave\n");
	fprintf(stderr, "\t-m minimum free space %%\n");
	fprintf(stderr, "\t-n number of distinguished rotational positions\n");
	fprintf(stderr, "\t-o optimization preference (`space' or `time')\n");
	fprintf(stderr, "\t-p spare sectors per track\n");
	fprintf(stderr, "\t-s file system size (sectors)\n");
	fprintf(stderr, "\t-r revolutions/minute\n");
	fprintf(stderr, "\t-t tracks/cylinder\n");
	fprintf(stderr, "\t-u sectors/track\n");
	fprintf(stderr, "\t-x spare sectors per cylinder\n");
	exit(1);
}