tunefs.c revision 69829 
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 69829 2000-12-10 20:59:30Z charnier $";
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/stat.h>
54
55#include <ufs/ffs/fs.h>
56#include <ufs/ufs/ufsmount.h>
57
58#include <err.h>
59#include <fcntl.h>
60#include <fstab.h>
61#include <paths.h>
62#include <stdio.h>
63#include <stdlib.h>
64#include <string.h>
65#include <unistd.h>
66
67/* the optimization warning string template */
68#define	OPTWARN	"should optimize for %s with minfree %s %d%%"
69
70union {
71	struct	fs sb;
72	char pad[MAXBSIZE];
73} sbun;
74#define	sblock sbun.sb
75
76int fi;
77long dev_bsize = 1;
78
79void bwrite __P((daddr_t, char *, int));
80int bread __P((daddr_t, char *, int));
81void getsb __P((struct fs *, char *));
82void putsb __P((struct fs *, char *, int));
83void usage __P((void));
84void printfs __P((void));
85
86int
87main(argc, argv)
88	int argc;
89	char *argv[];
90{
91	char *special, *name;
92	struct stat st;
93	int Aflag = 0, active = 0;
94	int aflag = 0, dflag = 0, eflag = 0, mflag = 0;
95	int nflag = 0, oflag = 0, pflag = 0;
96	int avalue = 0, dvalue = 0, evalue = 0, mvalue = 0, ovalue = 0;
97	char *nvalue = NULL;
98	struct fstab *fs;
99	char *chg[2], device[MAXPATHLEN];
100	struct ufs_args args;
101	struct statfs stfs;
102	int found_arg, ch;
103
104        if (argc < 3)
105                usage();
106	found_arg = 0; /* at least one arg is required */
107	while ((ch = getopt(argc, argv, "Aa:d:e:m:n:o:p")) != -1)
108	  switch (ch) {
109	  case 'A':
110		found_arg = 1;
111		Aflag++;
112		break;
113	  case 'a':
114		found_arg = 1;
115		name = "maximum contiguous block count";
116		avalue = atoi(optarg);
117		if (avalue < 1)
118			errx(10, "%s must be >= 1 (was %s)", name, optarg);
119		aflag = 1;
120		break;
121	  case 'd':
122		found_arg = 1;
123		name = "rotational delay between contiguous blocks";
124		dvalue = atoi(optarg);
125		dflag = 1;
126		break;
127	  case 'e':
128		found_arg = 1;
129		name = "maximum blocks per file in a cylinder group";
130		evalue = atoi(optarg);
131		if (evalue < 1)
132			errx(10, "%s must be >= 1 (was %s)", name, optarg);
133		eflag = 1;
134		break;
135	  case 'm':
136		found_arg = 1;
137		name = "minimum percentage of free space";
138		mvalue = atoi(optarg);
139		if (mvalue < 0 || mvalue > 99)
140			errx(10, "bad %s (%s)", name, optarg);
141		mflag = 1;
142		break;
143	  case 'n':
144		found_arg = 1;
145 		name = "soft updates";
146 		nvalue = optarg;
147                if (strcmp(nvalue, "enable") && strcmp(nvalue, "disable")) {
148 			errx(10, "bad %s (options are %s)",
149 			    name, "`enable' or `disable'");
150 		}
151		nflag = 1;
152 		break;
153	  case 'o':
154		found_arg = 1;
155		name = "optimization preference";
156		chg[FS_OPTSPACE] = "space";
157		chg[FS_OPTTIME] = "time";
158		if (strcmp(optarg, chg[FS_OPTSPACE]) == 0)
159			ovalue = FS_OPTSPACE;
160		else if (strcmp(optarg, chg[FS_OPTTIME]) == 0)
161			ovalue = FS_OPTTIME;
162		else
163			errx(10, "bad %s (options are `space' or `time')",
164					    name);
165		oflag = 1;
166		break;
167	  case 'p':
168		pflag = 1;
169		break;
170	  default:
171		usage();
172	  }
173	argc -= optind;
174	argv += optind;
175
176	if (found_arg == 0 || argc != 1)
177	  usage();
178
179	special = argv[0];
180	fs = getfsfile(special);
181	if (fs) {
182		if (statfs(special, &stfs) == 0 &&
183		    strcmp(special, stfs.f_mntonname) == 0) {
184			active = 1;
185		}
186		special = fs->fs_spec;
187	}
188again:
189	if (stat(special, &st) < 0) {
190		if (*special != '/') {
191			if (*special == 'r')
192				special++;
193			(void)sprintf(device, "%s/%s", _PATH_DEV, special);
194			special = device;
195			goto again;
196		}
197		err(1, "%s", special);
198	}
199	if ((st.st_mode & S_IFMT) != S_IFBLK &&
200	    (st.st_mode & S_IFMT) != S_IFCHR)
201		errx(10, "%s: not a block or character device", special);
202	getsb(&sblock, special);
203
204	if (pflag) {
205		printfs();
206		exit(0);
207	}
208	if (aflag) {
209		name = "maximum contiguous block count";
210		if (sblock.fs_maxcontig == avalue) {
211			warnx("%s remains unchanged as %d", name, avalue);
212		}
213		else {
214			warnx("%s changes from %d to %d",
215					name, sblock.fs_maxcontig, avalue);
216			sblock.fs_maxcontig = avalue;
217		}
218	}
219	if (dflag) {
220		name = "rotational delay between contiguous blocks";
221		if (sblock.fs_rotdelay == dvalue) {
222			warnx("%s remains unchanged as %dms", name, dvalue);
223		}
224		else {
225			warnx("%s changes from %dms to %dms",
226				    name, sblock.fs_rotdelay, dvalue);
227			sblock.fs_rotdelay = dvalue;
228		}
229	}
230	if (eflag) {
231		name = "maximum blocks per file in a cylinder group";
232		if (sblock.fs_maxbpg == evalue) {
233			warnx("%s remains unchanged as %d", name, evalue);
234		}
235		else {
236			warnx("%s changes from %d to %d",
237					name, sblock.fs_maxbpg, evalue);
238			sblock.fs_maxbpg = evalue;
239		}
240	}
241	if (mflag) {
242		name = "minimum percentage of free space";
243		if (sblock.fs_minfree == mvalue) {
244			warnx("%s remains unchanged as %d%%", name, mvalue);
245		}
246		else {
247			warnx("%s changes from %d%% to %d%%",
248				    name, sblock.fs_minfree, mvalue);
249			sblock.fs_minfree = mvalue;
250			if (mvalue >= MINFREE && sblock.fs_optim == FS_OPTSPACE)
251				warnx(OPTWARN, "time", ">=", MINFREE);
252			if (mvalue < MINFREE && sblock.fs_optim == FS_OPTTIME)
253				warnx(OPTWARN, "space", "<", MINFREE);
254		}
255	}
256	if (nflag) {
257 		name = "soft updates";
258 		if (strcmp(nvalue, "enable") == 0) {
259			if ( sblock.fs_flags & FS_DOSOFTDEP ) {
260				warnx("%s remains unchanged as enabled", name);
261			} else {
262 				sblock.fs_flags |= FS_DOSOFTDEP;
263 				warnx("%s set", name);
264			}
265 		} else if (strcmp(nvalue, "disable") == 0) {
266			if ((~sblock.fs_flags & FS_DOSOFTDEP) == FS_DOSOFTDEP) {
267				warnx("%s remains unchanged as disabled", name);
268			} else {
269 				sblock.fs_flags &= ~FS_DOSOFTDEP;
270 				warnx("%s cleared", name);
271			}
272 		}
273	}
274	if (oflag) {
275		name = "optimization preference";
276		chg[FS_OPTSPACE] = "space";
277		chg[FS_OPTTIME] = "time";
278		if (sblock.fs_optim == ovalue) {
279			warnx("%s remains unchanged as %s", name, chg[ovalue]);
280		}
281		else {
282			warnx("%s changes from %s to %s",
283				    name, chg[sblock.fs_optim], chg[ovalue]);
284			sblock.fs_optim = ovalue;
285			if (sblock.fs_minfree >= MINFREE &&
286					ovalue == FS_OPTSPACE)
287				warnx(OPTWARN, "time", ">=", MINFREE);
288			if (sblock.fs_minfree < MINFREE &&
289					ovalue == FS_OPTTIME)
290				warnx(OPTWARN, "space", "<", MINFREE);
291		}
292	}
293
294	putsb(&sblock, special, Aflag);
295	if (active) {
296		bzero(&args, sizeof(args));
297		if (mount("ufs", fs->fs_file,
298		    stfs.f_flags | MNT_UPDATE | MNT_RELOAD, &args) < 0)
299			err(9, "%s: reload", special);
300		warnx("file system reloaded");
301	}
302	exit(0);
303}
304
305void
306usage()
307{
308	fprintf(stderr, "%s\n%s\n%s\n",
309"usage: tunefs [-A] [-a maxcontig] [-d rotdelay] [-e maxbpg] [-m minfree]",
310"              [-p] [-n enable | disable] [-o space | time]",
311"              special | filesystem");
312	exit(2);
313}
314
315void
316getsb(fs, file)
317	register struct fs *fs;
318	char *file;
319{
320
321	fi = open(file, O_RDONLY);
322	if (fi < 0)
323		err(3, "cannot open %s", file);
324	if (bread((daddr_t)SBOFF, (char *)fs, SBSIZE))
325		err(4, "%s: bad super block", file);
326	if (fs->fs_magic != FS_MAGIC)
327		err(5, "%s: bad magic number", file);
328	dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
329}
330
331void
332putsb(fs, file, all)
333	register struct fs *fs;
334	char *file;
335	int all;
336{
337	int i;
338
339	/*
340	 * Re-open the device read-write. Use the read-only file
341	 * descriptor as an interlock to prevent the device from
342	 * being mounted while we are switching mode.
343	 */
344	i = fi;
345	fi = open(file, O_RDWR);
346	close(i);
347	if (fi < 0)
348		err(3, "cannot open %s", file);
349	bwrite((daddr_t)SBOFF / dev_bsize, (char *)fs, SBSIZE);
350	if (all)
351		for (i = 0; i < fs->fs_ncg; i++)
352			bwrite(fsbtodb(fs, cgsblock(fs, i)),
353			    (char *)fs, SBSIZE);
354	close(fi);
355}
356
357void
358printfs()
359{
360	warnx("soft updates:  (-n)                                %s",
361		(sblock.fs_flags & FS_DOSOFTDEP)? "enabled" : "disabled");
362	warnx("maximum contiguous block count: (-a)               %d",
363	      sblock.fs_maxcontig);
364	warnx("rotational delay between contiguous blocks: (-d)   %d ms",
365	      sblock.fs_rotdelay);
366	warnx("maximum blocks per file in a cylinder group: (-e)  %d",
367	      sblock.fs_maxbpg);
368	warnx("minimum percentage of free space: (-m)             %d%%",
369	      sblock.fs_minfree);
370	warnx("optimization preference: (-o)                      %s",
371	      sblock.fs_optim == FS_OPTSPACE ? "space" : "time");
372	if (sblock.fs_minfree >= MINFREE &&
373	    sblock.fs_optim == FS_OPTSPACE)
374		warnx(OPTWARN, "time", ">=", MINFREE);
375	if (sblock.fs_minfree < MINFREE &&
376	    sblock.fs_optim == FS_OPTTIME)
377		warnx(OPTWARN, "space", "<", MINFREE);
378}
379
380void
381bwrite(blk, buf, size)
382	daddr_t blk;
383	char *buf;
384	int size;
385{
386
387	if (lseek(fi, (off_t)blk * dev_bsize, SEEK_SET) < 0)
388		err(6, "FS SEEK");
389	if (write(fi, buf, size) != size)
390		err(7, "FS WRITE");
391}
392
393int
394bread(bno, buf, cnt)
395	daddr_t bno;
396	char *buf;
397	int cnt;
398{
399	int i;
400
401	if (lseek(fi, (off_t)bno * dev_bsize, SEEK_SET) < 0)
402		return(1);
403	if ((i = read(fi, buf, cnt)) != cnt) {
404		for(i=0; i<sblock.fs_bsize; i++)
405			buf[i] = 0;
406		return (1);
407	}
408	return (0);
409}
410