diff --git a/sbin/newfs/Makefile b/sbin/newfs/Makefile
index 2c420f972e3c..5cc43f186e0e 100644
--- a/sbin/newfs/Makefile
+++ b/sbin/newfs/Makefile
@@ -6,7 +6,7 @@ SRCS=	getmntopts.c newfs.c mkfs.c
 MAN=	newfs.8
 
 MOUNT=	${.CURDIR}/../mount
-CFLAGS+=-DMFS -DFSIRAND -I${MOUNT}
+CFLAGS+=-DMFS -DFSIRAND -I${MOUNT} ${BDECFLAGS}
 .PATH:	${MOUNT}
 
 LINKS=	${BINDIR}/newfs
diff --git a/sbin/newfs/mkfs.c b/sbin/newfs/mkfs.c
index 28334e66af97..19049ee84779 100644
--- a/sbin/newfs/mkfs.c
+++ b/sbin/newfs/mkfs.c
@@ -90,9 +90,6 @@ extern void srandomdev __P((void));
 /*
  * variables set up by front end.
  */
-extern int	mfs;		/* run as the memory based filesystem */
-extern char	*mfs_mtpt;	/* mount point for mfs          */ 
-extern struct stat mfs_mtstat;	/* stat prior to mount          */
 extern int	Nflag;		/* run mkfs without writing file system */
 extern int	Oflag;		/* format as an 4.3BSD file system */
 extern int	Uflag;		/* enable soft updates for file system */
@@ -159,8 +156,6 @@ void wtfs __P((daddr_t, int, char *));
 void wtfsflush __P((void));
 
 #ifndef STANDALONE
-void get_memleft __P((void));
-void raise_data_limit __P((void));
 #else
 void free __P((char *));
 char * calloc __P((u_long, u_long));
@@ -168,8 +163,6 @@ caddr_t malloc __P((u_long));
 caddr_t realloc __P((char *, u_long));
 #endif
 
-int mfs_ppid = 0;
-
 void
 mkfs(pp, fsys, fi, fo)
 	struct partition *pp;
@@ -182,10 +175,8 @@ mkfs(pp, fsys, fi, fo)
 	off_t usedb;
 	long mapcramped, inodecramped;
 	long postblsize, rotblsize, totalsbsize;
-	int status, fd;
 	time_t utime;
 	quad_t sizepb;
-	void started();
 	int width;
 	char tmpbuf[100];	/* XXX this will break in about 2,500 years */
 
@@ -198,55 +189,6 @@ mkfs(pp, fsys, fi, fo)
 		srandomdev();
 	}
 #endif
-	if (mfs) {
-		mfs_ppid = getpid();
-		(void) signal(SIGUSR1, started);
-		if ((i = fork())) {
-			if (i == -1)
-				err(10, "mfs");
-			if (waitpid(i, &status, 0) != -1 && WIFEXITED(status))
-				exit(WEXITSTATUS(status));
-			exit(11);
-			/* NOTREACHED */
-		}
-#ifdef STANDALONE
-		(void)malloc(0);
-#else
-		raise_data_limit();
-#endif
-		if(filename) {
-			unsigned char buf[BUFSIZ];
-			unsigned long l,l1;
-			fd = open(filename,O_RDWR|O_TRUNC|O_CREAT,0644);
-			if(fd < 0)
-				err(12, "%s", filename);
-			for(l=0;l< fssize * sectorsize;l += l1) {
-				l1 = fssize * sectorsize;
-				if (BUFSIZ < l1)
-					l1 = BUFSIZ;
-				if (l1 != write(fd,buf,l1))
-					err(12, "%s", filename);
-			}
-			membase = mmap(
-				0,
-				fssize * sectorsize,
-				PROT_READ|PROT_WRITE,
-				MAP_SHARED,
-				fd,
-				0);
-			if(membase == MAP_FAILED)
-				err(12, "mmap");
-			close(fd);
-		} else {
-#ifndef STANDALONE
-			get_memleft();
-#endif
-			if (fssize * sectorsize > (memleft - 131072))
-				fssize = (memleft - 131072) / sectorsize;
-			if ((membase = malloc(fssize * sectorsize)) == NULL)
-				errx(13, "malloc failed");
-		}
-	}
 	fsi = fi;
 	fso = fo;
 	if (Oflag) {
@@ -637,7 +579,7 @@ next:
 		    NSPF(&sblock);
 		warn = 0;
 	}
-	if (warn && !mfs) {
+	if (warn) {
 		printf("Warning: %d sector(s) in last cylinder unallocated\n",
 		    sblock.fs_spc -
 		    (fssize * NSPF(&sblock) - (sblock.fs_ncyl - 1)
@@ -684,32 +626,27 @@ next:
 	/*
 	 * Dump out summary information about file system.
 	 */
-	if (!mfs) {
-		printf("%s:\t%d sectors in %d %s of %d tracks, %d sectors\n",
-		    fsys, sblock.fs_size * NSPF(&sblock), sblock.fs_ncyl,
-		    "cylinders", sblock.fs_ntrak, sblock.fs_nsect);
+	printf("%s:\t%d sectors in %d %s of %d tracks, %d sectors\n",
+	    fsys, sblock.fs_size * NSPF(&sblock), sblock.fs_ncyl,
+	    "cylinders", sblock.fs_ntrak, sblock.fs_nsect);
 #define B2MBFACTOR (1 / (1024.0 * 1024.0))
-		printf(
-		    "\t%.1fMB in %d cyl groups (%d c/g, %.2fMB/g, %d i/g)%s\n",
-		    (float)sblock.fs_size * sblock.fs_fsize * B2MBFACTOR,
-		    sblock.fs_ncg, sblock.fs_cpg,
-		    (float)sblock.fs_fpg * sblock.fs_fsize * B2MBFACTOR,
-		    sblock.fs_ipg,
-		    sblock.fs_flags & FS_DOSOFTDEP ? " SOFTUPDATES" : "");
+	printf(
+	    "\t%.1fMB in %d cyl groups (%d c/g, %.2fMB/g, %d i/g)%s\n",
+	    (float)sblock.fs_size * sblock.fs_fsize * B2MBFACTOR,
+	    sblock.fs_ncg, sblock.fs_cpg,
+	    (float)sblock.fs_fpg * sblock.fs_fsize * B2MBFACTOR,
+	    sblock.fs_ipg,
+	    sblock.fs_flags & FS_DOSOFTDEP ? " SOFTUPDATES" : "");
 #undef B2MBFACTOR
-	}
 	/*
 	 * Now build the cylinders group blocks and
 	 * then print out indices of cylinder groups.
 	 */
-	if (!mfs)
-		printf("super-block backups (for fsck -b #) at:\n");
+	printf("super-block backups (for fsck -b #) at:\n");
 	i = 0;
 	width = charsperline();
 	for (cylno = 0; cylno < sblock.fs_ncg; cylno++) {
 		initcg(cylno, utime);
-		if (mfs)
-			continue;
 		j = snprintf(tmpbuf, sizeof(tmpbuf), " %ld%s",
 		    fsbtodb(&sblock, cgsblock(&sblock, cylno)),
 		    cylno < (sblock.fs_ncg-1) ? "," : "" );
@@ -721,9 +658,8 @@ next:
 		printf("%s", tmpbuf);
 		fflush(stdout);
 	}
-	if (!mfs)
-		printf("\n");
-	if (Nflag && !mfs)
+	printf("\n");
+	if (Nflag)
 		exit(0);
 	/*
 	 * Now construct the initial file system,
@@ -752,18 +688,6 @@ next:
 	pp->p_fsize = sblock.fs_fsize;
 	pp->p_frag = sblock.fs_frag;
 	pp->p_cpg = sblock.fs_cpg;
-	/*
-	 * Notify parent process of success.
-	 * Dissociate from session and tty.
-	 */
-	if (mfs) {
-		kill(mfs_ppid, SIGUSR1);
-		(void) setsid();
-		(void) close(0);
-		(void) close(1);
-		(void) close(2);
-		(void) chdir("/");
-	}
 }
 
 /*
@@ -1009,10 +933,7 @@ fsinit(utime)
 	/*
 	 * create the root directory
 	 */
-	if (mfs)
-		node.di_mode = IFDIR | 01777;
-	else
-		node.di_mode = IFDIR | UMASK;
+	node.di_mode = IFDIR | UMASK;
 	node.di_nlink = PREDEFDIR;
 	if (Oflag)
 		node.di_size = makedir((struct direct *)oroot_dir, PREDEFDIR);
@@ -1178,34 +1099,6 @@ iput(ip, ino)
 	wtfs(d, sblock.fs_bsize, (char *)buf);
 }
 
-/*
- * Notify parent process that the filesystem has created itself successfully.
- *
- * We have to wait until the mount has actually completed!
- */
-void
-started()
-{
-	int retry = 100;	/* 10 seconds, 100ms */
-
-	while (mfs_ppid && retry) {
-		struct stat st;
-
-		if (
-		    stat(mfs_mtpt, &st) < 0 ||
-		    st.st_dev != mfs_mtstat.st_dev
-		) {
-			break;
-		}
-		usleep(100*1000);
-		--retry;
-	}
-	if (retry == 0) {
-		fatal("mfs mount failed waiting for mount to go active");
-	}
-	exit(0);
-}
-
 #ifdef STANDALONE
 /*
  * Replace libc function with one suited to our needs.
@@ -1285,18 +1178,6 @@ free(ptr)
 
 #else   /* !STANDALONE */
 
-void
-raise_data_limit()
-{
-	struct rlimit rlp;
-
-	if (getrlimit(RLIMIT_DATA, &rlp) < 0)
-		warn("getrlimit");
-	rlp.rlim_cur = rlp.rlim_max;
-	if (setrlimit(RLIMIT_DATA, &rlp) < 0)
-		warn("setrlimit");
-}
-
 #ifdef __ELF__
 extern char *_etext;
 #define etext _etext
@@ -1304,23 +1185,6 @@ extern char *_etext;
 extern char *etext;
 #endif
 
-void
-get_memleft()
-{
-	static u_long pgsz;
-	struct rlimit rlp;
-	u_long freestart;
-	u_long dstart;
-	u_long memused;
-
-	pgsz = getpagesize() - 1;
-	dstart = ((u_long)&etext) &~ pgsz;
-	freestart = ((u_long)(sbrk(0) + pgsz) &~ pgsz);
-	if (getrlimit(RLIMIT_DATA, &rlp) < 0)
-		warn("getrlimit");
-	memused = freestart - dstart;
-	memleft = rlp.rlim_cur - memused;
-}
 #endif  /* STANDALONE */
 
 /*
@@ -1335,10 +1199,6 @@ rdfs(bno, size, bf)
 	int n;
 
 	wtfsflush();
-	if (mfs) {
-		memmove(bf, membase + bno * sectorsize, size);
-		return;
-	}
 	if (lseek(fsi, (off_t)bno * sectorsize, 0) < 0) {
 		printf("seek error: %ld\n", (long)bno);
 		err(33, "rdfs");
@@ -1388,10 +1248,6 @@ wtfs(bno, size, bf)
 	int n;
 	int done;
 
-	if (mfs) {
-		memmove(membase + bno * sectorsize, bf, size);
-		return;
-	}
 	if (Nflag)
 		return;
 	done = 0;
diff --git a/sbin/newfs/newfs.c b/sbin/newfs/newfs.c
index 20abe7f594d3..cf26619904a4 100644
--- a/sbin/newfs/newfs.c
+++ b/sbin/newfs/newfs.c
@@ -69,11 +69,6 @@ static const char rcsid[] =
 #include <syslog.h>
 #include <unistd.h>
 
-#ifdef MFS
-#include <sys/types.h>
-#include <sys/mman.h>
-#endif
-
 #if __STDC__
 #include <stdarg.h>
 #else
@@ -166,9 +161,6 @@ void	fatal();
 #define NTRACKS		1	/* number of heads */
 #define NSECTORS	4096	/* number of sectors */
 
-int	mfs;			/* run as the memory based filesystem */
-char	*mfs_mtpt;		/* mount point for mfs		*/
-struct stat mfs_mtstat;		/* stat prior to mount		*/
 int	Nflag;			/* run without writing file system */
 int	Oflag;			/* format as an 4.3BSD file system */
 int	Uflag;			/* enable soft updates for file system */
@@ -216,6 +208,7 @@ char	*progname;
 
 extern void mkfs __P((struct partition *, char *, int, int));
 static void usage __P((void));
+static void rewritelabel __P((char *s, int fd, register struct disklabel *lp));
 
 int
 main(argc, argv)
@@ -225,18 +218,12 @@ main(argc, argv)
 	register int ch;
 	register struct partition *pp;
 	register struct disklabel *lp;
-	struct disklabel mfsfakelabel;
 	struct disklabel *getdisklabel();
 	struct partition oldpartition;
 	struct stat st;
 	struct statfs *mp;
 	int fsi, fso, len, n, vflag;
 	char *cp, *s1, *s2, *special, *opstring;
-#ifdef MFS
-	struct vfsconf vfc;
-	int error;
-	char buf[BUFSIZ];
-#endif
 
 	vflag = 0;
 	if ((progname = strrchr(*argv, '/')))
@@ -244,18 +231,7 @@ main(argc, argv)
 	else
 		progname = *argv;
 
-	if (strstr(progname, "mfs")) {
-		mfs = 1;
-		Nflag++;
-		fprintf(stderr,
-"WARNING: MFS is being phased out in preference for md devices\n"
-"WARNING: Please see mdconfig(8) for details\n");
-		exit(1);
-	}
-
-	opstring = mfs ?
-	    "NF:T:Ua:b:c:d:e:f:g:h:i:m:o:s:" :
-	    "NOS:T:Ua:b:c:d:e:f:g:h:i:k:l:m:n:o:p:r:s:t:u:vx:";
+	opstring = "NOS:T:Ua:b:c:d:e:f:g:h:i:k:l:m:n:o:p:r:s:t:u:vx:";
 	while ((ch = getopt(argc, argv, opstring)) != -1)
 		switch (ch) {
 		case 'N':
@@ -338,16 +314,12 @@ main(argc, argv)
 				nrpos = 1;
 			break;
 		case 'o':
-			if (mfs)
-				getmntopts(optarg, mopts, &mntflags, 0);
-			else {
-				if (strcmp(optarg, "space") == 0)
-					opt = FS_OPTSPACE;
-				else if (strcmp(optarg, "time") == 0)
-					opt = FS_OPTTIME;
-				else
+			if (strcmp(optarg, "space") == 0)
+				opt = FS_OPTSPACE;
+			else if (strcmp(optarg, "time") == 0)
+				opt = FS_OPTTIME;
+			else
 	fatal("%s: unknown optimization preference: use `space' or `time'", optarg);
-			}
 			break;
 		case 'p':
 			if ((trackspares = atoi(optarg)) < 0)
@@ -387,39 +359,10 @@ main(argc, argv)
 	argc -= optind;
 	argv += optind;
 
-	if (argc != 2 && (mfs || argc != 1))
+	if (argc != 2 && argc != 1)
 		usage();
 
 	special = argv[0];
-	/* Copy the NetBSD way of faking up a disk label */
-        if (mfs && !strcmp(special, "swap")) {
-                /* 
-                 * it's an MFS, mounted on "swap."  fake up a label.
-                 * XXX XXX XXX
-                 */
-                fso = -1;       /* XXX; normally done below. */
- 
-                memset(&mfsfakelabel, 0, sizeof(mfsfakelabel));
-                mfsfakelabel.d_secsize = 512;
-                mfsfakelabel.d_nsectors = 64;
-                mfsfakelabel.d_ntracks = 16;
-                mfsfakelabel.d_ncylinders = 16; 
-                mfsfakelabel.d_secpercyl = 1024;
-                mfsfakelabel.d_secperunit = 16384;
-                mfsfakelabel.d_rpm = 3600;
-                mfsfakelabel.d_interleave = 1;
-                mfsfakelabel.d_npartitions = 1;
-                mfsfakelabel.d_partitions[0].p_size = 16384;
-                mfsfakelabel.d_partitions[0].p_fsize = 1024;
-                mfsfakelabel.d_partitions[0].p_frag = 8;
-                mfsfakelabel.d_partitions[0].p_cpg = 16;
-
-                lp = &mfsfakelabel;
-                pp = &mfsfakelabel.d_partitions[0];
-
-                goto havelabel;
-        }
-
 	cp = strrchr(special, '/');
 	if (cp == 0) {
 		/*
@@ -457,47 +400,39 @@ main(argc, argv)
 			++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 = strchr(argv[0], '\0');
- 		if (cp == argv[0])
- 			fatal("null special file name");
- 		cp--;
- 		if (!vflag && (*cp < 'a' || *cp > 'h') && !isdigit(*cp))
-			fatal("%s: can't figure out file system partition",
-			    argv[0]);
+	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)
+		printf("%s: %s: not a character-special device\n",
+		    progname, special);
+	cp = strchr(argv[0], '\0');
+	if (cp == argv[0])
+		fatal("null special file name");
+	cp--;
+	if (!vflag && (*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];
+	if (disktype == NULL)
+		disktype = argv[1];
 #endif
-		lp = getdisklabel(special, fsi);
-		if (vflag || 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);
-	}
-havelabel:
+	lp = getdisklabel(special, fsi);
+	if (vflag || 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)
+	if (fssize > pp->p_size)
 	       fatal("%s: maximum file system size on the `%c' partition is %d",
 			argv[0], *cp, pp->p_size);
 	if (rpm == 0) {
@@ -610,15 +545,6 @@ havelabel:
 		pp->p_size *= secperblk;
 	}
 #endif
-	if (mfs) {
-		mfs_mtpt = argv[1];
-		if (
-		    stat(mfs_mtpt, &mfs_mtstat) < 0 ||
-		    !S_ISDIR(mfs_mtstat.st_mode)
-		) {
-			fatal("mount point not dir: %s", mfs_mtpt);
-		}
-	}
 	mkfs(pp, special, fsi, fso);
 #ifdef tahoe
 	if (realsectorsize != DEV_BSIZE)
@@ -632,37 +558,6 @@ havelabel:
 	if (!Nflag)
 		close(fso);
 	close(fsi);
-#ifdef MFS
-	if (mfs) {
-		struct mfs_args args;
-
-		snprintf(buf, sizeof(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;
-
-		error = getvfsbyname("mfs", &vfc);
-		if (error && vfsisloadable("mfs")) {
-			if (vfsload("mfs"))
-				fatal("vfsload(mfs)");
-			endvfsent();	/* flush cache */
-			error = getvfsbyname("mfs", &vfc);
-		}
-		if (error)
-			fatal("mfs filesystem not available");
-
-		if (mount(vfc.vfc_name, argv[1], mntflags, &args) < 0)
-			fatal("%s: %s", argv[1], strerror(errno));
-		if(filename) {
-			munmap(membase,fssize * sectorsize);
-		}
-	}
-#endif
 	exit(0);
 }
 
@@ -697,6 +592,7 @@ getdisklabel(s, fd)
 	return (&lab);
 }
 
+void
 rewritelabel(s, fd, lp)
 	char *s;
 	int fd;
@@ -746,18 +642,13 @@ fatal(fmt, va_alist)
 static void
 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,
+	fprintf(stderr,
+	    "usage: %s [ -fsoptions ] special-device%s\n",
+	    progname,
 #ifdef COMPAT
-		    " [device-type]");
+	    " [device-type]");
 #else
-		    "");
+	    "");
 #endif
 	fprintf(stderr, "where fsoptions are:\n");
 	fprintf(stderr,