tunefs.c revision 105162 
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 105162 2002-10-15 18:14:05Z rwatson $";
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/ufs/ufsmount.h>
57#include <ufs/ufs/dinode.h>
58#include <ufs/ffs/fs.h>
59
60#include <err.h>
61#include <fcntl.h>
62#include <fstab.h>
63#include <paths.h>
64#include <stdio.h>
65#include <stdlib.h>
66#include <string.h>
67#include <unistd.h>
68
69/* the optimization warning string template */
70#define	OPTWARN	"should optimize for %s with minfree %s %d%%"
71
72union {
73	struct	fs sb;
74	char pad[MAXBSIZE];
75} sbun;
76#define	sblock sbun.sb
77
78int fi;
79long dev_bsize = 1;
80
81void bwrite(ufs2_daddr_t, const char *, int);
82int bread(ufs2_daddr_t, char *, int);
83void getsb(struct fs *, const char *);
84void putsb(struct fs *, const char *, int);
85void usage(void);
86void printfs(void);
87
88int
89main(argc, argv)
90	int argc;
91	char *argv[];
92{
93	char *special;
94	const char *name;
95	struct stat st;
96	int Aflag = 0, active = 0, aflag = 0;
97	int eflag = 0, fflag = 0, lflag = 0, mflag = 0;
98	int nflag = 0, oflag = 0, pflag = 0, sflag = 0;
99	int evalue = 0, fvalue = 0;
100	int mvalue = 0, ovalue = 0, svalue = 0;
101	char *avalue = NULL, *lvalue = NULL, *nvalue = NULL;
102	struct fstab *fs;
103	const char *chg[2];
104	char device[MAXPATHLEN];
105	struct ufs_args args;
106	struct statfs stfs;
107	int found_arg, ch;
108
109        if (argc < 3)
110                usage();
111	found_arg = 0; /* at least one arg is required */
112	while ((ch = getopt(argc, argv, "Aa:e:f:l:m:n:o:ps:")) != -1)
113	  switch (ch) {
114	  case 'A':
115		found_arg = 1;
116		Aflag++;
117		break;
118	  case 'a':
119		found_arg = 1;
120		name = "ACLs";
121		avalue = optarg;
122		if (strcmp(avalue, "enable") && strcmp(avalue, "disable")) {
123			errx(10, "bad %s (options are %s)", name,
124			    "`enable' or `disable'");
125		}
126		aflag = 1;
127		break;
128	  case 'e':
129		found_arg = 1;
130		name = "maximum blocks per file in a cylinder group";
131		evalue = atoi(optarg);
132		if (evalue < 1)
133			errx(10, "%s must be >= 1 (was %s)", name, optarg);
134		eflag = 1;
135		break;
136	  case 'f':
137		found_arg = 1;
138		name = "average file size";
139		fvalue = atoi(optarg);
140		if (fvalue < 1)
141			errx(10, "%s must be >= 1 (was %s)", name, optarg);
142		fflag = 1;
143		break;
144	  case 'l':
145		found_arg = 1;
146		name = "multilabel MAC file system";
147		lvalue = optarg;
148		if (strcmp(lvalue, "enable") && strcmp(lvalue, "disable")) {
149			errx(10, "bad %s (options are %s)", name,
150			    "`enable' or `disable'");
151		}
152		lflag = 1;
153		break;
154	  case 'm':
155		found_arg = 1;
156		name = "minimum percentage of free space";
157		mvalue = atoi(optarg);
158		if (mvalue < 0 || mvalue > 99)
159			errx(10, "bad %s (%s)", name, optarg);
160		mflag = 1;
161		break;
162	  case 'n':
163		found_arg = 1;
164 		name = "soft updates";
165 		nvalue = optarg;
166                if (strcmp(nvalue, "enable") && strcmp(nvalue, "disable")) {
167 			errx(10, "bad %s (options are %s)",
168 			    name, "`enable' or `disable'");
169 		}
170		nflag = 1;
171 		break;
172	  case 'o':
173		found_arg = 1;
174		name = "optimization preference";
175		chg[FS_OPTSPACE] = "space";
176		chg[FS_OPTTIME] = "time";
177		if (strcmp(optarg, chg[FS_OPTSPACE]) == 0)
178			ovalue = FS_OPTSPACE;
179		else if (strcmp(optarg, chg[FS_OPTTIME]) == 0)
180			ovalue = FS_OPTTIME;
181		else
182			errx(10, "bad %s (options are `space' or `time')",
183					    name);
184		oflag = 1;
185		break;
186	  case 'p':
187		found_arg = 1;
188		pflag = 1;
189		break;
190	  case 's':
191		found_arg = 1;
192		name = "expected number of files per directory";
193		svalue = atoi(optarg);
194		if (svalue < 1)
195			errx(10, "%s must be >= 1 (was %s)", name, optarg);
196		sflag = 1;
197		break;
198	  default:
199		usage();
200	  }
201	argc -= optind;
202	argv += optind;
203
204	if (found_arg == 0 || argc != 1)
205	  usage();
206
207	special = argv[0];
208	fs = getfsfile(special);
209	if (fs) {
210		if (statfs(special, &stfs) == 0 &&
211		    strcmp(special, stfs.f_mntonname) == 0) {
212			active = 1;
213		}
214		special = fs->fs_spec;
215	}
216again:
217	if (stat(special, &st) < 0) {
218		if (*special != '/') {
219			if (*special == 'r')
220				special++;
221			(void)snprintf(device, sizeof(device), "%s%s",
222				       _PATH_DEV, special);
223			special = device;
224			goto again;
225		}
226		err(1, "%s", special);
227	}
228	if (fs == NULL && (st.st_mode & S_IFMT) == S_IFDIR)
229		errx(10, "%s: unknown file system", special);
230	getsb(&sblock, special);
231
232	if (pflag) {
233		printfs();
234		exit(0);
235	}
236	if (aflag) {
237		name = "ACLs";
238		if (strcmp(avalue, "enable") == 0) {
239			if (sblock.fs_flags & FS_ACLS) {
240				warnx("%s remains unchanged as enabled", name);
241			} else {
242				sblock.fs_flags |= FS_ACLS;
243				warnx("%s set", name);
244			}
245		} else if (strcmp(avalue, "disable") == 0) {
246			if ((~sblock.fs_flags & FS_ACLS) ==
247			    FS_ACLS) {
248				warnx("%s remains unchanged as disabled",
249				    name);
250			} else {
251				sblock.fs_flags &= ~FS_ACLS;
252				warnx("%s set", name);
253			}
254		}
255	}
256	if (eflag) {
257		name = "maximum blocks per file in a cylinder group";
258		if (sblock.fs_maxbpg == evalue) {
259			warnx("%s remains unchanged as %d", name, evalue);
260		}
261		else {
262			warnx("%s changes from %d to %d",
263					name, sblock.fs_maxbpg, evalue);
264			sblock.fs_maxbpg = evalue;
265		}
266	}
267	if (fflag) {
268		name = "average file size";
269		if (sblock.fs_avgfilesize == fvalue) {
270			warnx("%s remains unchanged as %d", name, fvalue);
271		}
272		else {
273			warnx("%s changes from %d to %d",
274					name, sblock.fs_avgfilesize, fvalue);
275			sblock.fs_avgfilesize = fvalue;
276		}
277	}
278	if (lflag) {
279		name = "multilabel";
280		if (strcmp(lvalue, "enable") == 0) {
281			if (sblock.fs_flags & FS_MULTILABEL) {
282				warnx("%s remains unchanged as enabled", name);
283			} else {
284				sblock.fs_flags |= FS_MULTILABEL;
285				warnx("%s set", name);
286			}
287		} else if (strcmp(lvalue, "disable") == 0) {
288			if ((~sblock.fs_flags & FS_MULTILABEL) ==
289			    FS_MULTILABEL) {
290				warnx("%s remains unchanged as disabled",
291				    name);
292			} else {
293				sblock.fs_flags &= ~FS_MULTILABEL;
294				warnx("%s set", name);
295			}
296		}
297	}
298	if (mflag) {
299		name = "minimum percentage of free space";
300		if (sblock.fs_minfree == mvalue) {
301			warnx("%s remains unchanged as %d%%", name, mvalue);
302		}
303		else {
304			warnx("%s changes from %d%% to %d%%",
305				    name, sblock.fs_minfree, mvalue);
306			sblock.fs_minfree = mvalue;
307			if (mvalue >= MINFREE && sblock.fs_optim == FS_OPTSPACE)
308				warnx(OPTWARN, "time", ">=", MINFREE);
309			if (mvalue < MINFREE && sblock.fs_optim == FS_OPTTIME)
310				warnx(OPTWARN, "space", "<", MINFREE);
311		}
312	}
313	if (nflag) {
314 		name = "soft updates";
315 		if (strcmp(nvalue, "enable") == 0) {
316			if (sblock.fs_flags & FS_DOSOFTDEP) {
317				warnx("%s remains unchanged as enabled", name);
318			} else if (sblock.fs_clean == 0) {
319				warnx("%s cannot be enabled until fsck is run",
320				    name);
321			} else {
322 				sblock.fs_flags |= FS_DOSOFTDEP;
323 				warnx("%s set", name);
324			}
325 		} else if (strcmp(nvalue, "disable") == 0) {
326			if ((~sblock.fs_flags & FS_DOSOFTDEP) == FS_DOSOFTDEP) {
327				warnx("%s remains unchanged as disabled", name);
328			} else {
329 				sblock.fs_flags &= ~FS_DOSOFTDEP;
330 				warnx("%s cleared", name);
331			}
332 		}
333	}
334	if (oflag) {
335		name = "optimization preference";
336		chg[FS_OPTSPACE] = "space";
337		chg[FS_OPTTIME] = "time";
338		if (sblock.fs_optim == ovalue) {
339			warnx("%s remains unchanged as %s", name, chg[ovalue]);
340		}
341		else {
342			warnx("%s changes from %s to %s",
343				    name, chg[sblock.fs_optim], chg[ovalue]);
344			sblock.fs_optim = ovalue;
345			if (sblock.fs_minfree >= MINFREE &&
346					ovalue == FS_OPTSPACE)
347				warnx(OPTWARN, "time", ">=", MINFREE);
348			if (sblock.fs_minfree < MINFREE &&
349					ovalue == FS_OPTTIME)
350				warnx(OPTWARN, "space", "<", MINFREE);
351		}
352	}
353	if (sflag) {
354		name = "expected number of files per directory";
355		if (sblock.fs_avgfpdir == svalue) {
356			warnx("%s remains unchanged as %d", name, svalue);
357		}
358		else {
359			warnx("%s changes from %d to %d",
360					name, sblock.fs_avgfpdir, svalue);
361			sblock.fs_avgfpdir = svalue;
362		}
363	}
364
365	putsb(&sblock, special, Aflag);
366	if (active) {
367		bzero(&args, sizeof(args));
368		if (mount("ufs", fs->fs_file,
369		    stfs.f_flags | MNT_UPDATE | MNT_RELOAD, &args) < 0)
370			err(9, "%s: reload", special);
371		warnx("file system reloaded");
372	}
373	exit(0);
374}
375
376void
377usage()
378{
379	fprintf(stderr, "%s\n%s\n%s\n",
380"usage: tunefs [-A] [-a enable | disable] [-e maxbpg] [-f avgfilesize]",
381"              [-l enable | disable] [-m minfree] [-n enable | disable]",
382"              [-o space | time] [-p] [-s avgfpdir] special | filesystem");
383	exit(2);
384}
385
386/*
387 * Possible superblock locations ordered from most to least likely.
388 */
389static int sblock_try[] = SBLOCKSEARCH;
390static ufs2_daddr_t sblockloc;
391
392void
393getsb(fs, file)
394	struct fs *fs;
395	const char *file;
396{
397	int i;
398
399	fi = open(file, O_RDONLY);
400	if (fi < 0)
401		err(3, "cannot open %s", file);
402	for (i = 0; sblock_try[i] != -1; i++) {
403		if (bread(sblock_try[i], (char *)fs, SBLOCKSIZE))
404			err(4, "%s: bad super block", file);
405		if ((fs->fs_magic == FS_UFS1_MAGIC ||
406		     (fs->fs_magic == FS_UFS2_MAGIC &&
407		      fs->fs_sblockloc == numfrags(fs, sblock_try[i]))) &&
408		    fs->fs_bsize <= MAXBSIZE &&
409		    fs->fs_bsize >= sizeof(struct fs))
410			break;
411	}
412	if (sblock_try[i] == -1)
413		err(5, "Cannot find file system superblock");
414	dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
415	sblockloc = sblock_try[i] / dev_bsize;
416}
417
418void
419putsb(fs, file, all)
420	struct fs *fs;
421	const char *file;
422	int all;
423{
424	int i;
425
426	/*
427	 * Re-open the device read-write. Use the read-only file
428	 * descriptor as an interlock to prevent the device from
429	 * being mounted while we are switching mode.
430	 */
431	i = fi;
432	fi = open(file, O_RDWR);
433	close(i);
434	if (fi < 0)
435		err(3, "cannot open %s", file);
436	bwrite(sblockloc, (const char *)fs, SBLOCKSIZE);
437	if (all)
438		for (i = 0; i < fs->fs_ncg; i++)
439			bwrite(fsbtodb(fs, cgsblock(fs, i)),
440			    (const char *)fs, SBLOCKSIZE);
441	close(fi);
442}
443
444void
445printfs()
446{
447	warnx("ACLs: (-a)                                         %s",
448		(sblock.fs_flags & FS_ACLS)? "enabled" : "disabled");
449	warnx("MAC multilabel: (-l)                               %s",
450		(sblock.fs_flags & FS_MULTILABEL)? "enabled" : "disabled");
451	warnx("soft updates:  (-n)                                %s",
452		(sblock.fs_flags & FS_DOSOFTDEP)? "enabled" : "disabled");
453	warnx("maximum blocks per file in a cylinder group: (-e)  %d",
454	      sblock.fs_maxbpg);
455	warnx("average file size: (-f)                            %d",
456	      sblock.fs_avgfilesize);
457	warnx("average number of files in a directory: (-s)       %d",
458	      sblock.fs_avgfpdir);
459	warnx("minimum percentage of free space: (-m)             %d%%",
460	      sblock.fs_minfree);
461	warnx("optimization preference: (-o)                      %s",
462	      sblock.fs_optim == FS_OPTSPACE ? "space" : "time");
463	if (sblock.fs_minfree >= MINFREE &&
464	    sblock.fs_optim == FS_OPTSPACE)
465		warnx(OPTWARN, "time", ">=", MINFREE);
466	if (sblock.fs_minfree < MINFREE &&
467	    sblock.fs_optim == FS_OPTTIME)
468		warnx(OPTWARN, "space", "<", MINFREE);
469}
470
471void
472bwrite(blk, buf, size)
473	ufs2_daddr_t blk;
474	const char *buf;
475	int size;
476{
477
478	if (lseek(fi, (off_t)blk * dev_bsize, SEEK_SET) < 0)
479		err(6, "FS SEEK");
480	if (write(fi, buf, size) != size)
481		err(7, "FS WRITE");
482}
483
484int
485bread(bno, buf, cnt)
486	ufs2_daddr_t bno;
487	char *buf;
488	int cnt;
489{
490	int i;
491
492	if (lseek(fi, (off_t)bno * dev_bsize, SEEK_SET) < 0)
493		return(1);
494	if ((i = read(fi, buf, cnt)) != cnt) {
495		for(i=0; i<sblock.fs_bsize; i++)
496			buf[i] = 0;
497		return (1);
498	}
499	return (0);
500}
501