newfs.c

早期freebsd实现

/*
 * 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. 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[] = "@(#)newfs.c	8.8 (Berkeley) 4/18/94";
#endif /* not lint */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1983, 1989, 1993, 1994\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

/*
 * newfs: friendly front end to mkfs
 */
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/disklabel.h>
#include <sys/file.h>
#include <sys/mount.h>

#include <ufs/ufs/dir.h>
#include <ufs/ffs/fs.h>

#include <ctype.h>
#include <errno.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>

#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

#include "mntopts.h"

struct mntopt mopts[] = {
	MOPT_STDOPTS,
	MOPT_ASYNC,
	{ NULL },
};

#if __STDC__
void	fatal(const char *fmt, ...);
#else
void	fatal();
#endif

#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	1024
#define	DFL_BLKSIZE	8192

/*
 * 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 16 cylinders
 * per group.
 */
#define	DESCPG		16	/* desired fs_cpg */

/*
 * 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.
 */
#define ROTDELAY	4

/*
 * 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

/*
 * 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.
 */
#define	NRPOS		8	/* number distinct rotational positions */


int	mfs;			/* run as the memory based filesystem */
int	Nflag;			/* run without writing file system */
int	Oflag;			/* format as an 4.3BSD file system */
int	fssize;			/* file system size */
int	ntracks;		/* # tracks/cylinder */
int	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 */
#ifdef tahoe
int	realsectorsize;		/* bytes/sector in hardware */
#endif
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	bbsize = BBSIZE;	/* boot block size */
int	sbsize = SBSIZE;	/* superblock size */
int	mntflags = MNT_ASYNC;	/* flags to be passed to mount */
u_long	memleft;		/* virtual memory available */
caddr_t	membase;		/* start address of memory based filesystem */
#ifdef COMPAT
char	*disktype;
int	unlabeled;
#endif

char	device[MAXPATHLEN];
char	*progname;

int
main(argc, argv)
	int argc;
	char *argv[];
{
	extern char *optarg;
	extern int optind;
	register int ch;
	register struct partition *pp;
	register struct disklabel *lp;
	struct disklabel *getdisklabel();
	struct partition oldpartition;
	struct stat st;
	struct statfs *mp;
	int fsi, fso, len, n;
	char *cp, *s1, *s2, *special, *opstring, buf[BUFSIZ];

	if (progname = rindex(*argv, '/'))
		++progname;
	else
		progname = *argv;

	if (strstr(progname, "mfs")) {
		mfs = 1;
		Nflag++;
	}

	opstring = mfs ?
	    "NT:a:b:c:d:e:f:i:m:o:s:" :
	    "NOS:T:a:b:c:d:e:f:i:k:l:m:n:o:p:r:s:t:u:x:";
	while ((ch = getopt(argc, argv, opstring)) != EOF)
		switch (ch) {
		case 'N':
			Nflag = 1;
			break;
		case 'O':
			Oflag = 1;
			break;
		case 'S':
			if ((sectorsize = atoi(optarg)) <= 0)
				fatal("%s: bad sector size", optarg);
			break;
#ifdef COMPAT
		case 'T':
			disktype = optarg;
			break;
#endif
		case 'a':
			if ((maxcontig = atoi(optarg)) <= 0)
				fatal("%s: bad maximum contiguous blocks\n",
				    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\n", optarg);
			break;
		case 'e':
			if ((maxbpg = atoi(optarg)) <= 0)
		fatal("%s: bad blocks per file in a cylinder group\n",
				    optarg);
			break;
		case 'f':
			if ((fsize = atoi(optarg)) <= 0)
				fatal("%s: bad fragment size", optarg);
			break;
		case 'i':
			if ((density = atoi(optarg)) <= 0)
				fatal("%s: bad bytes per inode\n", 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 %%\n", optarg);
			break;
		case 'n':
			if ((nrpos = atoi(optarg)) <= 0)
				fatal("%s: bad rotational layout count\n",
				    optarg);
			break;
		case 'o':
			if (mfs)
				getmntopts(optarg, mopts, &mntflags);
			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'.");
			}
			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\n", optarg);
			break;
		case 's':
			if ((fssize = atoi(optarg)) <= 0)
				fatal("%s: bad file system size", optarg);
			break;
		case 't':
			if ((ntracks = atoi(optarg)) <= 0)
				fatal("%s: bad total tracks", optarg);
			break;
		case 'u':
			if ((nsectors = atoi(optarg)) <= 0)
				fatal("%s: bad sectors/track", optarg);
			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];
	cp = rindex(special, '/');
	if (cp == 0) {
		/*
		 * No path prefix; try /dev/r%s then /dev/%s.
		 */
		(void)sprintf(device, "%sr%s", _PATH_DEV, special);
		if (stat(device, &st) == -1)
			(void)sprintf(device, "%s%s", _PATH_DEV, special);
		special = device;
	}
	if (Nflag) {
		fso = -1;
	} else {
		fso = open(special, O_WRONLY);
		if (fso < 0)
			fatal("%s: %s", special, strerror(errno));