tunefs.c revision 96478 
1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1983, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)tunefs.c	8.2 (Berkeley) 4/19/94";
43#endif
44static const char rcsid[] =
45  "$FreeBSD: head/sbin/tunefs/tunefs.c 96478 2002-05-12 21:37:08Z phk $";
46#endif /* not lint */
47
48/*
49 * tunefs: change layout parameters to an existing file system.
50 */
51#include <sys/param.h>
52#include <sys/mount.h>
53#include <sys/disklabel.h>
54#include <sys/stat.h>
55
56#include <ufs/ffs/fs.h>
57#include <ufs/ufs/ufsmount.h>
58
59#include <err.h>
60#include <fcntl.h>
61#include <fstab.h>
62#include <paths.h>
63#include <stdio.h>
64#include <stdlib.h>
65#include <string.h>
66#include <unistd.h>
67
68/* the optimization warning string template */
69#define	OPTWARN	"should optimize for %s with minfree %s %d%%"
70
71union {
72	struct	fs sb;
73	char pad[MAXBSIZE];
74} sbun;
75#define	sblock sbun.sb
76
77int fi;
78long dev_bsize = 1;
79
80void bwrite(daddr_t, const char *, int);
81int bread(daddr_t, char *, int);
82void getsb(struct fs *, const char *);
83void putsb(struct fs *, const char *, int);
84void usage(void);
85void printfs(void);
86
87int
88main(argc, argv)
89	int argc;
90	char *argv[];
91{
92	char *special;
93	const char *name;
94	struct stat st;
95	int Aflag = 0, active = 0;
96	int aflag = 0, dflag = 0, eflag = 0, fflag = 0, mflag = 0;
97	int nflag = 0, oflag = 0, pflag = 0, sflag = 0;
98	int avalue = 0, dvalue = 0, evalue = 0, fvalue = 0;
99	int mvalue = 0, ovalue = 0, svalue = 0;
100	char *nvalue = NULL;
101	struct fstab *fs;
102	const char *chg[2];
103	char device[MAXPATHLEN];
104	struct ufs_args args;
105	struct statfs stfs;
106	int found_arg, ch;
107
108        if (argc < 3)
109                usage();
110	found_arg = 0; /* at least one arg is required */
111	while ((ch = getopt(argc, argv, "Aa:d:e:f:m:n:o:ps:")) != -1)
112	  switch (ch) {
113	  case 'A':
114		found_arg = 1;
115		Aflag++;
116		break;
117	  case 'a':
118		found_arg = 1;
119		name = "maximum contiguous block count";
120		avalue = atoi(optarg);
121		if (avalue < 1)
122			errx(10, "%s must be >= 1 (was %s)", name, optarg);
123		aflag = 1;
124		break;
125	  case 'd':
126		found_arg = 1;
127		name = "rotational delay between contiguous blocks";
128		dvalue = atoi(optarg);
129		dflag = 1;
130		break;
131	  case 'e':
132		found_arg = 1;
133		name = "maximum blocks per file in a cylinder group";
134		evalue = atoi(optarg);
135		if (evalue < 1)
136			errx(10, "%s must be >= 1 (was %s)", name, optarg);
137		eflag = 1;
138		break;
139	  case 'f':
140		found_arg = 1;
141		name = "average file size";
142		fvalue = atoi(optarg);
143		if (fvalue < 1)
144			errx(10, "%s must be >= 1 (was %s)", name, optarg);
145		fflag = 1;
146		break;
147	  case 'm':
148		found_arg = 1;
149		name = "minimum percentage of free space";
150		mvalue = atoi(optarg);
151		if (mvalue < 0 || mvalue > 99)
152			errx(10, "bad %s (%s)", name, optarg);
153		mflag = 1;
154		break;
155	  case 'n':
156		found_arg = 1;
157 		name = "soft updates";
158 		nvalue = optarg;
159                if (strcmp(nvalue, "enable") && strcmp(nvalue, "disable")) {
160 			errx(10, "bad %s (options are %s)",
161 			    name, "`enable' or `disable'");
162 		}
163		nflag = 1;
164 		break;
165	  case 'o':
166		found_arg = 1;
167		name = "optimization preference";
168		chg[FS_OPTSPACE] = "space";
169		chg[FS_OPTTIME] = "time";
170		if (strcmp(optarg, chg[FS_OPTSPACE]) == 0)
171			ovalue = FS_OPTSPACE;
172		else if (strcmp(optarg, chg[FS_OPTTIME]) == 0)
173			ovalue = FS_OPTTIME;
174		else
175			errx(10, "bad %s (options are `space' or `time')",
176					    name);
177		oflag = 1;
178		break;
179	  case 'p':
180		found_arg = 1;
181		pflag = 1;
182		break;
183	  case 's':
184		found_arg = 1;
185		name = "expected number of files per directory";
186		svalue = atoi(optarg);
187		if (svalue < 1)
188			errx(10, "%s must be >= 1 (was %s)", name, optarg);
189		sflag = 1;
190		break;
191	  default:
192		usage();
193	  }
194	argc -= optind;
195	argv += optind;
196
197	if (found_arg == 0 || argc != 1)
198	  usage();
199
200	special = argv[0];
201	fs = getfsfile(special);
202	if (fs) {
203		if (statfs(special, &stfs) == 0 &&
204		    strcmp(special, stfs.f_mntonname) == 0) {
205			active = 1;
206		}
207		special = fs->fs_spec;
208	}
209again:
210	if (stat(special, &st) < 0) {
211		if (*special != '/') {
212			if (*special == 'r')
213				special++;
214			(void)snprintf(device, sizeof(device), "%s%s",
215				       _PATH_DEV, special);
216			special = device;
217			goto again;
218		}
219		err(1, "%s", special);
220	}
221	if (fs == NULL && (st.st_mode & S_IFMT) == S_IFDIR)
222		errx(10, "%s: unknown file system", special);
223	getsb(&sblock, special);
224
225	if (pflag) {
226		printfs();
227		exit(0);
228	}
229	if (aflag) {
230		name = "maximum contiguous block count";
231		if (sblock.fs_maxcontig == avalue) {
232			warnx("%s remains unchanged as %d", name, avalue);
233		}
234		else {
235			warnx("%s changes from %d to %d",
236					name, sblock.fs_maxcontig, avalue);
237			sblock.fs_maxcontig = avalue;
238		}
239	}
240	if (dflag) {
241		name = "rotational delay between contiguous blocks";
242		if (sblock.fs_rotdelay == dvalue) {
243			warnx("%s remains unchanged as %dms", name, dvalue);
244		}
245		else {
246			warnx("%s changes from %dms to %dms",
247				    name, sblock.fs_rotdelay, dvalue);
248			sblock.fs_rotdelay = dvalue;
249		}
250	}
251	if (eflag) {
252		name = "maximum blocks per file in a cylinder group";
253		if (sblock.fs_maxbpg == evalue) {
254			warnx("%s remains unchanged as %d", name, evalue);
255		}
256		else {
257			warnx("%s changes from %d to %d",
258					name, sblock.fs_maxbpg, evalue);
259			sblock.fs_maxbpg = evalue;
260		}
261	}
262	if (fflag) {
263		name = "average file size";
264		if (sblock.fs_avgfilesize == fvalue) {
265			warnx("%s remains unchanged as %d", name, fvalue);
266		}
267		else {
268			warnx("%s changes from %d to %d",
269					name, sblock.fs_avgfilesize, fvalue);
270			sblock.fs_avgfilesize = fvalue;
271		}
272	}
273	if (mflag) {
274		name = "minimum percentage of free space";
275		if (sblock.fs_minfree == mvalue) {
276			warnx("%s remains unchanged as %d%%", name, mvalue);
277		}
278		else {
279			warnx("%s changes from %d%% to %d%%",
280				    name, sblock.fs_minfree, mvalue);
281			sblock.fs_minfree = mvalue;
282			if (mvalue >= MINFREE && sblock.fs_optim == FS_OPTSPACE)
283				warnx(OPTWARN, "time", ">=", MINFREE);
284			if (mvalue < MINFREE && sblock.fs_optim == FS_OPTTIME)
285				warnx(OPTWARN, "space", "<", MINFREE);
286		}
287	}
288	if (nflag) {
289 		name = "soft updates";
290 		if (strcmp(nvalue, "enable") == 0) {
291			if (sblock.fs_flags & FS_DOSOFTDEP) {
292				warnx("%s remains unchanged as enabled", name);
293			} else if (sblock.fs_clean == 0) {
294				warnx("%s cannot be enabled until fsck is run",
295				    name);
296			} else {
297 				sblock.fs_flags |= FS_DOSOFTDEP;
298 				warnx("%s set", name);
299			}
300 		} else if (strcmp(nvalue, "disable") == 0) {
301			if ((~sblock.fs_flags & FS_DOSOFTDEP) == FS_DOSOFTDEP) {
302				warnx("%s remains unchanged as disabled", name);
303			} else {
304 				sblock.fs_flags &= ~FS_DOSOFTDEP;
305 				warnx("%s cleared", name);
306			}
307 		}
308	}
309	if (oflag) {
310		name = "optimization preference";
311		chg[FS_OPTSPACE] = "space";
312		chg[FS_OPTTIME] = "time";
313		if (sblock.fs_optim == ovalue) {
314			warnx("%s remains unchanged as %s", name, chg[ovalue]);
315		}
316		else {
317			warnx("%s changes from %s to %s",
318				    name, chg[sblock.fs_optim], chg[ovalue]);
319			sblock.fs_optim = ovalue;
320			if (sblock.fs_minfree >= MINFREE &&
321					ovalue == FS_OPTSPACE)
322				warnx(OPTWARN, "time", ">=", MINFREE);
323			if (sblock.fs_minfree < MINFREE &&
324					ovalue == FS_OPTTIME)
325				warnx(OPTWARN, "space", "<", MINFREE);
326		}
327	}
328	if (sflag) {
329		name = "expected number of files per directory";
330		if (sblock.fs_avgfpdir == svalue) {
331			warnx("%s remains unchanged as %d", name, svalue);
332		}
333		else {
334			warnx("%s changes from %d to %d",
335					name, sblock.fs_avgfpdir, svalue);
336			sblock.fs_avgfpdir = svalue;
337		}
338	}
339
340	putsb(&sblock, special, Aflag);
341	if (active) {
342		bzero(&args, sizeof(args));
343		if (mount("ufs", fs->fs_file,
344		    stfs.f_flags | MNT_UPDATE | MNT_RELOAD, &args) < 0)
345			err(9, "%s: reload", special);
346		warnx("file system reloaded");
347	}
348	exit(0);
349}
350
351void
352usage()
353{
354	fprintf(stderr, "%s\n%s\n%s\n",
355"usage: tunefs [-A] [-a maxcontig] [-d rotdelay] [-e maxbpg] [-f avgfilesize]",
356"              [-m minfree] [-p] [-n enable | disable] [-o space | time]",
357"              [-s filesperdir] special | filesystem");
358	exit(2);
359}
360
361void
362getsb(fs, file)
363	struct fs *fs;
364	const char *file;
365{
366
367	fi = open(file, O_RDONLY);
368	if (fi < 0)
369		err(3, "cannot open %s", file);
370	if (bread((daddr_t)SBOFF, (char *)fs, SBSIZE))
371		err(4, "%s: bad super block", file);
372	if (fs->fs_magic != FS_MAGIC)
373		errx(5, "%s: bad magic number", file);
374	dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
375}
376
377void
378putsb(fs, file, all)
379	struct fs *fs;
380	const char *file;
381	int all;
382{
383	int i;
384
385	/*
386	 * Re-open the device read-write. Use the read-only file
387	 * descriptor as an interlock to prevent the device from
388	 * being mounted while we are switching mode.
389	 */
390	i = fi;
391	fi = open(file, O_RDWR);
392	close(i);
393	if (fi < 0)
394		err(3, "cannot open %s", file);
395	bwrite((daddr_t)SBOFF / dev_bsize, (const char *)fs, SBSIZE);
396	if (all)
397		for (i = 0; i < fs->fs_ncg; i++)
398			bwrite(fsbtodb(fs, cgsblock(fs, i)),
399			    (const char *)fs, SBSIZE);
400	close(fi);
401}
402
403void
404printfs()
405{
406	warnx("soft updates:  (-n)                                %s",
407		(sblock.fs_flags & FS_DOSOFTDEP)? "enabled" : "disabled");
408	warnx("maximum contiguous block count: (-a)               %d",
409	      sblock.fs_maxcontig);
410	warnx("rotational delay between contiguous blocks: (-d)   %d ms",
411	      sblock.fs_rotdelay);
412	warnx("maximum blocks per file in a cylinder group: (-e)  %d",
413	      sblock.fs_maxbpg);
414	warnx("average file size: (-f)                            %d",
415	      sblock.fs_avgfilesize);
416	warnx("average number of files in a directory: (-s)       %d",
417	      sblock.fs_avgfpdir);
418	warnx("minimum percentage of free space: (-m)             %d%%",
419	      sblock.fs_minfree);
420	warnx("optimization preference: (-o)                      %s",
421	      sblock.fs_optim == FS_OPTSPACE ? "space" : "time");
422	if (sblock.fs_minfree >= MINFREE &&
423	    sblock.fs_optim == FS_OPTSPACE)
424		warnx(OPTWARN, "time", ">=", MINFREE);
425	if (sblock.fs_minfree < MINFREE &&
426	    sblock.fs_optim == FS_OPTTIME)
427		warnx(OPTWARN, "space", "<", MINFREE);
428}
429
430void
431bwrite(blk, buf, size)
432	daddr_t blk;
433	const char *buf;
434	int size;
435{
436
437	if (lseek(fi, (off_t)blk * dev_bsize, SEEK_SET) < 0)
438		err(6, "FS SEEK");
439	if (write(fi, buf, size) != size)
440		err(7, "FS WRITE");
441}
442
443int
444bread(bno, buf, cnt)
445	daddr_t bno;
446	char *buf;
447	int cnt;
448{
449	int i;
450
451	if (lseek(fi, (off_t)bno * dev_bsize, SEEK_SET) < 0)
452		return(1);
453	if ((i = read(fi, buf, cnt)) != cnt) {
454		for(i=0; i<sblock.fs_bsize; i++)
455			buf[i] = 0;
456		return (1);
457	}
458	return (0);
459}
460