text: /*
   * Copyright (c) 1983, 1989, 1993, 1994
   *	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. 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.
   *
   * @(#) Copyright (c) 1983, 1989, 1993, 1994 The Regents of the University of California.  All rights reserved.
   * @(#)newfs.c	8.13 (Berkeley) 5/1/95
   * $FreeBSD: src/sbin/newfs/newfs.c,v 1.30.2.9 2003/05/13 12:03:55 joerg Exp $
   */
  
  /*
   * newfs: friendly front end to mkfs
   */
  #include <sys/param.h>
  #include <sys/stat.h>
  #include <sys/diskslice.h>
  #include <sys/mount.h>
  #include <sys/sysctl.h>
  
  #include <vfs/ufs/dir.h>
  #include <vfs/ufs/dinode.h>
  #include <vfs/ufs/fs.h>
  #include <vfs/ufs/ufsmount.h>
  
  #include <ctype.h>
  #include <err.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <mntopts.h>
  #include <inttypes.h>
  #include <paths.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <syslog.h>
  #include <unistd.h>
  #include <disktab.h>
  
  #ifdef MFS
  #include <sys/types.h>
  #include <sys/mman.h>
  #endif
  
  #include <stdarg.h>
  
  #include "defs.h"
  
  struct mntopt mopts[] = {
  	MOPT_STDOPTS,
  	MOPT_ASYNC,
  	MOPT_NULL,
  };
  
  void	fatal(const char *fmt, ...) __dead2 __printflike(1, 2);
  
  #define	COMPAT			/* allow non-labeled disks */
  
  /*
   * The following two constants set the default block and fragment sizes.
   * Both constants must be a power of 2 and meet the following constraints:
   *	MINBSIZE <= DESBLKSIZE <= MAXBSIZE
   *	sectorsize <= DESFRAGSIZE <= DESBLKSIZE
   *	DESBLKSIZE / DESFRAGSIZE <= 8
   */
  #define	DFL_FRAGSIZE	2048
  #define	DFL_BLKSIZE	16384
  
  /*
   * Cylinder groups may have up to many cylinders. The actual
   * number used depends upon how much information can be stored
   * on a single cylinder. The default is to use as many as possible
   * cylinders per group.
   */
  #define	DESCPG		65536	/* desired fs_cpg ("infinity") */
  
  /*
   * Once upon a time...
   *    ROTDELAY gives the minimum number of milliseconds to initiate
   *    another disk transfer on the same cylinder. It is used in
   *    determining the rotationally optimal layout for disk blocks
   *    within a file; the default of fs_rotdelay is 4ms.
   *
   * ...but now we make this 0 to disable the rotdelay delay because
   * modern drives with read/write-behind achieve higher performance
   * without the delay.
   */
  #define ROTDELAY	0
  
  /*
   * MAXBLKPG determines the maximum number of data blocks which are
   * placed in a single cylinder group. The default is one indirect
   * block worth of data blocks.
   */
  #define MAXBLKPG(bsize)	((bsize) / sizeof(daddr_t))
  
  /*
   * Each file system has a number of inodes statically allocated.
   * We allocate one inode slot per NFPI fragments, expecting this
   * to be far more than we will ever need.
   */
  #define	NFPI		4
  
  /*
   * Once upon a time...
   *    For each cylinder we keep track of the availability of blocks at different
   *    rotational positions, so that we can lay out the data to be picked
   *    up with minimum rotational latency.  NRPOS is the default number of
   *    rotational positions that we distinguish.  With NRPOS of 8 the resolution
   *    of our summary information is 2ms for a typical 3600 rpm drive.
   *
   * ...but now we make this 1 (which essentially disables the rotational
   * position table because modern drives with read-ahead and write-behind do
   * better without the rotational position table.
   */
  #define	NRPOS		1	/* number distinct rotational positions */
  
  /*
   * About the same time as the above, we knew what went where on the disks.
   * no longer so, so kill the code which finds the different platters too...
   * We do this by saying one head, with a lot of sectors on it.
   * The number of sectors are used to determine the size of a cyl-group.
   * Kirk suggested one or two meg per "cylinder" so we say two.
   */
  #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	Lflag;			/* add a volume label */
  int	Nflag;			/* run without writing file system */
  int	Oflag;			/* format as an 4.3BSD file system */
  int	Cflag;			/* copy underlying filesystem (mfs only) */
  int	Uflag;			/* enable soft updates for file system */
  int	Eflag;			/* erase contents using TRIM */
  uint64_t slice_offset;		/* Pysical device slice offset */
  u_long	fssize;			/* file system size */
  int	ntracks = NTRACKS;	/* # tracks/cylinder */
  int	nsectors = NSECTORS;	/* # sectors/track */
  int	nphyssectors;		/* # sectors/track including spares */
  int	secpercyl;		/* sectors per cylinder */
  int	trackspares = -1;	/* spare sectors per track */
  int	cylspares = -1;		/* spare sectors per cylinder */
  int	sectorsize;		/* bytes/sector */
  int	realsectorsize;		/* bytes/sector in hardware */
  int	rpm;			/* revolutions/minute of drive */
  int	interleave;		/* hardware sector interleave */
  int	trackskew = -1;		/* sector 0 skew, per track */
  int	headswitch;		/* head switch time, usec */
  int	trackseek;		/* track-to-track seek, usec */
  int	fsize = 0;		/* fragment size */
  int	bsize = 0;		/* block size */
  int	cpg = DESCPG;		/* cylinders/cylinder group */
  int	cpgflg;			/* cylinders/cylinder group flag was given */
  int	minfree = MINFREE;	/* free space threshold */
  int	opt = DEFAULTOPT;	/* optimization preference (space or time) */
  int	density;		/* number of bytes per inode */
  int	maxcontig = 0;		/* max contiguous blocks to allocate */
  int	rotdelay = ROTDELAY;	/* rotational delay between blocks */
  int	maxbpg;			/* maximum blocks per file in a cyl group */
  int	nrpos = NRPOS;		/* # of distinguished rotational positions */
  int	avgfilesize = AVFILESIZ;/* expected average file size */
  int	avgfilesperdir = AFPDIR;/* expected number of files per directory */
  int	bbsize = BBSIZE;	/* boot block size */
  int	sbsize = SBSIZE;	/* superblock size */
  int	mntflags = MNT_ASYNC;	/* flags to be passed to mount */
  int	t_or_u_flag = 0;	/* user has specified -t or -u */
  caddr_t	membase;		/* start address of memory based filesystem */
  char	*filename;
  u_char	*volumelabel = NULL;	/* volume label for filesystem */
  #ifdef COMPAT
  char	*disktype;
  int	unlabeled;
  #endif
  
  char	mfsdevname[256];
  char	*progname;
  
  static void usage(void);
  static void mfsintr(int signo);
  
  int
  main(int argc, char **argv)
  {
  	int ch, i;
  	struct disktab geom;		/* disk geometry data */
  	struct stat st;
  	struct statfs *mp;
  	int fsi = -1, fso = -1, len, n, vflag;
  	char *s1, *s2, *special;
  	const char *opstring;
  #ifdef MFS
  	struct vfsconf vfc;
  	int error;
  #endif
  
  	bzero(&geom, sizeof(geom));
  	vflag = 0;
  	if ((progname = strrchr(*argv, '/')))
  		++progname;
  	else
  		progname = *argv;
  
  	if (strstr(progname, "mfs")) {
  		mfs = 1;
  		Nflag++;
  	}
  
  	opstring = mfs ?
  	    "L:NCF:T:Ua:b:c:d:e:f:g:h:i:m:o:s:v" :
  	    "L:NEOS: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 'E':
  			Eflag = 1;
  			break;
  		case 'L':
  			volumelabel = optarg;
  			i = -1;
  			while (isalnum(volumelabel[++i]))
  				;
  			if (volumelabel[i] != '\0')
  				errx(1, "bad volume label. Valid characters are alphanumerics.");
  			if (strlen(volumelabel) >= MAXVOLLEN)
  				errx(1, "bad volume label. Length is longer than %d.",
  				    MAXVOLLEN);
  			Lflag = 1;
  			break;
  		case 'N':
  			Nflag = 1;
  			break;
  		case 'O':
  			Oflag = 1;
  			break;
  		case 'C':
  			Cflag = 1;	/* MFS only */
  			break;
  		case 'S':
  			if ((sectorsize = atoi(optarg)) <= 0)
  				fatal("%s: bad sector size", optarg);
  			break;
  #ifdef COMPAT
  		case 'T':
  			disktype = optarg;
  			break;
  #endif
  		case 'F':
  			filename = optarg;
  			break;
  		case 'U':
  			Uflag = 1;
  			break;
  		case 'a':
  			if ((maxcontig = atoi(optarg)) <= 0)
  				fatal("%s: bad maximum contiguous blocks",
  				    optarg);
  			break;
  		case 'b':
  			if ((bsize = atoi(optarg)) < MINBSIZE)
  				fatal("%s: bad block size", optarg);
  			break;
  		case 'c':
  			if ((cpg = atoi(optarg)) <= 0)
  				fatal("%s: bad cylinders/group", optarg);
  			cpgflg++;
  			break;
  		case 'd':
  			if ((rotdelay = atoi(optarg)) < 0)
  				fatal("%s: bad rotational delay", optarg);
  			break;
  		case 'e':
  			if ((maxbpg = atoi(optarg)) <= 0)
  		fatal("%s: bad blocks per file in a cylinder group",
  				    optarg);
  			break;
  		case 'f':
  			if ((fsize = atoi(optarg)) <= 0)
  				fatal("%s: bad fragment size", optarg);
  			break;
  		case 'g':
  			if ((avgfilesize = atoi(optarg)) <= 0)
  				fatal("%s: bad average file size", optarg);
  			break;
  		case 'h':
  			if ((avgfilesperdir = atoi(optarg)) <= 0)
  				fatal("%s: bad average files per dir", optarg);
  			break;
  		case 'i':
  			if ((density = atoi(optarg)) <= 0)
  				fatal("%s: bad bytes per inode", optarg);
  			break;
  		case 'k':
  			if ((trackskew = atoi(optarg)) < 0)
  				fatal("%s: bad track skew", optarg);
  			break;
  		case 'l':
  			if ((interleave = atoi(optarg)) <= 0)
  				fatal("%s: bad interleave", optarg);
  			break;
  		case 'm':
  			if ((minfree = atoi(optarg)) < 0 || minfree > 99)
  				fatal("%s: bad free space %%", optarg);
  			break;
  		case 'n':
  			if ((nrpos = atoi(optarg)) < 0)
  				fatal("%s: bad rotational layout count",
  				    optarg);
  			if (nrpos == 0)
  				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
  	fatal("%s: unknown optimization preference: use `space' or `time'", optarg);
  			}
  			break;
  		case 'p':
  			if ((trackspares = atoi(optarg)) < 0)
  				fatal("%s: bad spare sectors per track",
  				    optarg);
  			break;
  		case 'r':
  			if ((rpm = atoi(optarg)) <= 0)
  				fatal("%s: bad revolutions/minute", optarg);
  			break;
  		case 's':
  			/*
  			 * Unsigned long but limit to long.  On 32 bit a
  			 * tad under 2G, on 64 bit the upper bound is more
  			 * swap space then operand size.
  			 *
  			 * NOTE: fssize is converted from 512 byte sectors
  			 * to filesystem block-sized sectors by mkfs XXX.
  			 */
  			fssize = strtoul(optarg, NULL, 10);
  			if (fssize == 0 || fssize > LONG_MAX)
  				fatal("%s: bad file system size", optarg);
  			break;
  		case 't':
  			t_or_u_flag++;
  			if ((ntracks = atoi(optarg)) < 0)
  				fatal("%s: bad total tracks", optarg);
  			break;
  		case 'u':
  			t_or_u_flag++;
  			if ((nsectors = atoi(optarg)) < 0)
  				fatal("%s: bad sectors/track", optarg);
  			break;
  		case 'v':
  			vflag = 1;
  			break;
  		case 'x':
  			if ((cylspares = atoi(optarg)) < 0)
  				fatal("%s: bad spare sectors per cylinder",
  				    optarg);
  			break;
  		case '?':
  		default:
  			usage();
  		}
  	}
  	argc -= optind;
  	argv += optind;
  
  	if (argc != 2 && (mfs || 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. */
  
  		geom.d_media_blksize = 512;
  		geom.d_nheads = 16;
  		geom.d_secpertrack = 64;
  		/* geom.d_ncylinders not used */
  		geom.d_secpercyl = 1024;
  		geom.d_media_blocks = 16384;
                  geom.d_rpm = 3600;
                  geom.d_interleave = 1;
  
                  goto havelabel;
          }
  
  	/*
  	 * If we can't stat the device and the path is relative, try
  	 * prepending /dev.
  	 */
  	if (stat(special, &st) < 0 && special[0] && special[0] != '/')
  		asprintf(&special, "/dev/%s", special);
  
  	if (Eflag) {
  		char sysctl_name[64];
  		int trim_enabled = 0;
  		size_t olen = sizeof(trim_enabled);
  		char *dev_name = strdup(special);
  
  		dev_name = strtok(dev_name + strlen("/dev/da"),"s");
  		sprintf(sysctl_name, "kern.cam.da.%s.trim_enabled",
  		    dev_name);
  
  		if (sysctlbyname(sysctl_name, &trim_enabled, &olen, NULL, 0) < 0) {
  			printf("Device:%s does not support the TRIM command\n",
  			    special);
  			usage();
  		}
  		if(!trim_enabled) {
  			printf("Erase device option selected, but sysctl (%s) "
  			    "is not enabled\n",sysctl_name);
  			usage();
  			  
  		}
  	}
  	if (Nflag) {
  		fso = -1;
  	} else {
  		fso = open(special, O_WRONLY);
  		if (fso < 0)
  			fatal("%s: %s", special, strerror(errno));
  
  		/* 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) {
  		struct disktab *dt;
  
  		if ((dt = getdisktabbyname(disktype)) == NULL)
  			fatal("%s: unknown disk type", disktype);
  		geom = *dt;
  	} else {
  		struct partinfo pinfo;
  
  		if (special[0] == 0)
   			fatal("null special file name");
  		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 && !vflag)
  			printf("%s: %s: not a character-special device\n",
  			    progname, special);
  #ifdef COMPAT
  		if (!mfs && disktype == NULL)
  			disktype = argv[1];
  #endif
  		if (ioctl(fsi, DIOCGPART, &pinfo) < 0) {
  			if (!vflag) {
  				fatal("%s: unable to retrieve geometry "
  				      "information", argv[0]);
  			}
  			/*
  			 * fake up geometry data
  			 */
  			geom.d_media_blksize = 512;
  			geom.d_nheads = 16;
  			geom.d_secpertrack = 64;
  			geom.d_secpercyl = 1024;
  			geom.d_media_blocks = st.st_size / 
  					      geom.d_media_blksize;
  			geom.d_media_size = geom.d_media_blocks *
  					    geom.d_media_blksize;
  			/* geom.d_ncylinders not used */
  		} else {
  			/*
  			 * extract geometry from pinfo
  			 */
  			geom.d_media_blksize = pinfo.media_blksize;
  			geom.d_nheads = pinfo.d_nheads;
  			geom.d_secpertrack = pinfo.d_secpertrack;
  			geom.d_secpercyl = pinfo.d_secpercyl;
  			/* geom.d_ncylinders not used */
  			geom.d_media_blocks = pinfo.media_blocks;
  			geom.d_media_size = pinfo.media_size;
  			slice_offset = pinfo.media_offset;
  		}
  		if (geom.d_media_blocks == 0 || geom.d_media_size == 0) {
  			fatal("%s: is unavailable", argv[0]);
  		}
  		printf("%s: media size %6.2fMB\n",
  		        argv[0], geom.d_media_size / 1024.0 / 1024.0);
  		if (geom.d_media_size / 512 >= 0x80000000ULL)
  			fatal("%s: media size is too large for newfs to handle",
  			      argv[0]);
  	}
  havelabel:
  	if (fssize == 0)
  		fssize = geom.d_media_blocks;
  	if ((u_long)fssize > geom.d_media_blocks && !mfs) {
  	       fatal("%s: maximum file system size is %" PRIu64 " blocks",
  		     argv[0], geom.d_media_blocks);
  	}
  	if (rpm == 0) {
  		rpm = geom.d_rpm;
  		if (rpm <= 0)
  			rpm = 3600;
  	}
  	if (ntracks == 0) {
  		ntracks = geom.d_nheads;
  		if (ntracks <= 0)
  			fatal("%s: no default #tracks", argv[0]);
  	}
  	if (nsectors == 0) {
  		nsectors = geom.d_secpertrack;
  		if (nsectors <= 0)
  			fatal("%s: no default #sectors/track", argv[0]);
  	}
  	if (sectorsize == 0) {
  		sectorsize = geom.d_media_blksize;
  		if (sectorsize <= 0)
  			fatal("%s: no default sector size", argv[0]);
  	}
  	if (trackskew == -1) {
  		trackskew = geom.d_trackskew;
  		if (trackskew < 0)
  			trackskew = 0;
  	}
  	if (interleave == 0) {
  		interleave = geom.d_interleave;
  		if (interleave <= 0)
  			interleave = 1;
  	}
  	if (fsize == 0)
  		fsize = MAX(DFL_FRAGSIZE, geom.d_media_blksize);
  	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, MAXPHYS / 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 = 0;
  	nphyssectors = nsectors + trackspares;
  	if (cylspares == -1)
  		cylspares = 0;
  	secpercyl = nsectors * ntracks - cylspares;
  	/*
  	 * Only complain if -t or -u have been specified; the default
  	 * case (4096 sectors per cylinder) is intended to disagree
  	 * with the disklabel.
  	 */
  	if (t_or_u_flag && (uint32_t)secpercyl != geom.d_secpercyl)
  		fprintf(stderr, "%s (%d) %s (%u)\n",
  			"Warning: calculated sectors per cylinder", secpercyl,
  			"disagrees with disk label", geom.d_secpercyl);
  	if (maxbpg == 0)
  		maxbpg = MAXBLKPG(bsize);
  	headswitch = geom.d_headswitch;
  	trackseek = geom.d_trkseek;
  	realsectorsize = sectorsize;
  	if (sectorsize != DEV_BSIZE) {		/* XXX */
  		int secperblk = sectorsize / DEV_BSIZE;
  
  		sectorsize = DEV_BSIZE;
  		nsectors *= secperblk;
  		nphyssectors *= secperblk;
  		secpercyl *= secperblk;
  		fssize *= secperblk;
  	}
  	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(special, fsi, fso, (Cflag && mfs) ? argv[1] : NULL);
  
  	/*
  	 * NOTE: Newfs no longer accesses or attempts to update the
  	 * filesystem disklabel.
  	 *
  	 * NOTE: fssize is converted from 512 byte sectors
  	 * to filesystem block-sized sectors by mkfs XXX.
  	 */
  	if (!Nflag)
  		close(fso);
  	close(fsi);
  #ifdef MFS
  	if (mfs) {
  		struct mfs_args args;
  
  		bzero(&args, sizeof(args));
  
  		snprintf(mfsdevname, sizeof(mfsdevname), "/dev/mfs%d",
  			getpid());
  		args.fspec = mfsdevname;
  		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 * fsize;
  
  		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 0
  		int udev;
  		udev = (253 << 8) | (getpid() & 255) | 
  			((getpid() & ~0xFF) << 8);
  		if (mknod(mfsdevname, S_IFCHR | 0700, udev) < 0)
  			printf("Warning: unable to create %s\n", mfsdevname);
  #endif
  		signal(SIGINT, mfsintr);
  		if (mount(vfc.vfc_name, argv[1], mntflags, &args) < 0)
  			fatal("%s: %s", argv[1], strerror(errno));
  		signal(SIGINT, SIG_DFL);
  		mfsintr(SIGINT);
  	}
  #endif
  	exit(0);
  }
  
  #ifdef MFS
  
  static void
  mfsintr(__unused int signo)
  {
  	if (filename)
  		munmap(membase, fssize * fsize);
  #if 0
  	remove(mfsdevname);
  #endif
  }
  
  #endif
  
  /*VARARGS*/
  void
  fatal(const char *fmt, ...)
  {
  	va_list ap;
  
  	va_start(ap, fmt);
  	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*/
  }
  
  void
  usage(void)
  {
  	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-C (mfs) Copy the underlying filesystem to the MFS mount\n");
  	fprintf(stderr, "\t-E erase file system contents using TRIM\n");
  	fprintf(stderr, "\t-L volume name\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-U enable soft updates\n");
  	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-g average file size\n");
  	fprintf(stderr, "\t-h average files per directory\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-v do not attempt to determine partition name from device name\n");
  	fprintf(stderr, "\t-x spare sectors per cylinder\n");
  	exit(1);
  }
  