xref: /netbsd/bin/df/df.c (revision c4a72b64) 
1 /*	$NetBSD: df.c,v 1.44 2002/09/26 16:27:43 provos Exp $	*/
2 
3 /*
4  * Copyright (c) 1980, 1990, 1993, 1994
5  *	The Regents of the University of California.  All rights reserved.
6  * (c) UNIX System Laboratories, Inc.
7  * All or some portions of this file are derived from material licensed
8  * to the University of California by American Telephone and Telegraph
9  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10  * the permission of UNIX System Laboratories, Inc.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions and the following disclaimer.
17  * 2. Redistributions in binary form must reproduce the above copyright
18  *    notice, this list of conditions and the following disclaimer in the
19  *    documentation and/or other materials provided with the distribution.
20  * 3. All advertising materials mentioning features or use of this software
21  *    must display the following acknowledgement:
22  *	This product includes software developed by the University of
23  *	California, Berkeley and its contributors.
24  * 4. Neither the name of the University nor the names of its contributors
25  *    may be used to endorse or promote products derived from this software
26  *    without specific prior written permission.
27  *
28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38  * SUCH DAMAGE.
39  */
40 
41 #include <sys/cdefs.h>
42 #ifndef lint
43 __COPYRIGHT(
44 "@(#) Copyright (c) 1980, 1990, 1993, 1994\n\
45 	The Regents of the University of California.  All rights reserved.\n");
46 #endif /* not lint */
47 
48 #ifndef lint
49 #if 0
50 static char sccsid[] = "@(#)df.c	8.7 (Berkeley) 4/2/94";
51 #else
52 __RCSID("$NetBSD: df.c,v 1.44 2002/09/26 16:27:43 provos Exp $");
53 #endif
54 #endif /* not lint */
55 
56 #include <sys/param.h>
57 #include <sys/stat.h>
58 #include <sys/mount.h>
59 
60 #include <err.h>
61 #include <errno.h>
62 #include <fcntl.h>
63 #include <util.h>
64 #include <stdio.h>
65 #include <stdlib.h>
66 #include <string.h>
67 #include <unistd.h>
68 
69 extern char *strpct(u_long, u_long, u_int);
70 
71 int	 main(int, char *[]);
72 int	 bread(off_t, void *, int);
73 char	*getmntpt(char *);
74 void	 prtstat(struct statfs *, int);
75 int	 selected(const char *);
76 void	 maketypelist(char *);
77 long	 regetmntinfo(struct statfs **, long);
78 void	 usage(void);
79 void	 prthumanval(int64_t, char *);
80 void	 prthuman(struct statfs *, long);
81 
82 int	aflag, hflag, iflag, kflag, lflag, mflag, nflag, Pflag;
83 char	**typelist = NULL;
84 
85 int
86 main(int argc, char *argv[])
87 {
88 	struct stat stbuf;
89 	struct statfs *mntbuf;
90 	long mntsize;
91 	int ch, i, maxwidth, width;
92 	char *mntpt;
93 
94 	while ((ch = getopt(argc, argv, "ahiklmnPt:")) != -1)
95 		switch (ch) {
96 		case 'a':
97 			aflag = 1;
98 			break;
99 		case 'h':
100 			hflag = 1;
101 			break;
102 		case 'i':
103 			iflag = 1;
104 			break;
105 		case 'k':
106 			kflag = 1;
107 			break;
108 		case 'l':
109 			lflag = 1;
110 			break;
111 		case 'm':
112 			mflag = 1;
113 			break;
114 		case 'n':
115 			nflag = 1;
116 			break;
117 		case 'P':
118 			Pflag = 1;
119 			break;
120 		case 't':
121 			if (typelist != NULL)
122 				errx(1, "only one -t option may be specified.");
123 			maketypelist(optarg);
124 			break;
125 		case '?':
126 		default:
127 			usage();
128 		}
129 	argc -= optind;
130 	argv += optind;
131 
132 	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
133 	if (mntsize == 0)
134 		err(1, "retrieving information on mounted file systems");
135 
136 	if (*argv == NULL) {
137 		mntsize = regetmntinfo(&mntbuf, mntsize);
138 	} else {
139 		mntbuf = malloc(argc * sizeof(struct statfs));
140 		mntsize = 0;
141 		for (; *argv != NULL; argv++) {
142 			if (stat(*argv, &stbuf) < 0) {
143 				if ((mntpt = getmntpt(*argv)) == 0) {
144 					warn("%s", *argv);
145 					continue;
146 				}
147 			} else if (S_ISBLK(stbuf.st_mode)) {
148 				if ((mntpt = getmntpt(*argv)) == 0)
149 					mntpt = *argv;
150 			} else
151 				mntpt = *argv;
152 			/*
153 			 * Statfs does not take a `wait' flag, so we cannot
154 			 * implement nflag here.
155 			 */
156 			if (!statfs(mntpt, &mntbuf[mntsize]))
157 				if (lflag &&
158 				    (mntbuf[mntsize].f_flags & MNT_LOCAL) == 0)
159 					warnx("Warning: %s is not a local %s",
160 					    *argv, "file system");
161 				else if
162 				    (!selected(mntbuf[mntsize].f_fstypename))
163 					warnx("Warning: %s mounted as a %s %s",
164 					    *argv,
165 					    mntbuf[mntsize].f_fstypename,
166 					    "file system");
167 				else
168 					++mntsize;
169 			else
170 				warn("%s", *argv);
171 		}
172 	}
173 
174 	maxwidth = 0;
175 	for (i = 0; i < mntsize; i++) {
176 		width = strlen(mntbuf[i].f_mntfromname);
177 		if (width > maxwidth)
178 			maxwidth = width;
179 	}
180 	for (i = 0; i < mntsize; i++)
181 		prtstat(&mntbuf[i], maxwidth);
182 	exit(0);
183 	/* NOTREACHED */
184 }
185 
186 char *
187 getmntpt(char *name)
188 {
189 	long mntsize, i;
190 	struct statfs *mntbuf;
191 
192 	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
193 	for (i = 0; i < mntsize; i++) {
194 		if (!strcmp(mntbuf[i].f_mntfromname, name))
195 			return (mntbuf[i].f_mntonname);
196 	}
197 	return (0);
198 }
199 
200 static enum { IN_LIST, NOT_IN_LIST } which;
201 
202 int
203 selected(const char *type)
204 {
205 	char **av;
206 
207 	/* If no type specified, it's always selected. */
208 	if (typelist == NULL)
209 		return (1);
210 	for (av = typelist; *av != NULL; ++av)
211 		if (!strncmp(type, *av, MFSNAMELEN))
212 			return (which == IN_LIST ? 1 : 0);
213 	return (which == IN_LIST ? 0 : 1);
214 }
215 
216 void
217 maketypelist(char *fslist)
218 {
219 	int i;
220 	char *nextcp, **av;
221 
222 	if ((fslist == NULL) || (fslist[0] == '\0'))
223 		errx(1, "empty type list");
224 
225 	/*
226 	 * XXX
227 	 * Note: the syntax is "noxxx,yyy" for no xxx's and
228 	 * no yyy's, not the more intuitive "noyyy,noyyy".
229 	 */
230 	if (fslist[0] == 'n' && fslist[1] == 'o') {
231 		fslist += 2;
232 		which = NOT_IN_LIST;
233 	} else
234 		which = IN_LIST;
235 
236 	/* Count the number of types. */
237 	for (i = 1, nextcp = fslist;
238 	    (nextcp = strchr(nextcp, ',')) != NULL; i++)
239 		++nextcp;
240 
241 	/* Build an array of that many types. */
242 	if ((av = typelist = malloc((i + 1) * sizeof(char *))) == NULL)
243 		err(1, "can't allocate type array");
244 	av[0] = fslist;
245 	for (i = 1, nextcp = fslist;
246 	    (nextcp = strchr(nextcp, ',')) != NULL; i++) {
247 		*nextcp = '\0';
248 		av[i] = ++nextcp;
249 	}
250 	/* Terminate the array. */
251 	av[i] = NULL;
252 }
253 
254 /*
255  * Make a pass over the filesystem info in ``mntbuf'' filtering out
256  * filesystem types not in ``fsmask'' and possibly re-stating to get
257  * current (not cached) info.  Returns the new count of valid statfs bufs.
258  */
259 long
260 regetmntinfo(struct statfs **mntbufp, long mntsize)
261 {
262 	int i, j;
263 	struct statfs *mntbuf;
264 
265 	if (!lflag && typelist == NULL && aflag)
266 		return (nflag ? mntsize : getmntinfo(mntbufp, MNT_WAIT));
267 
268 	mntbuf = *mntbufp;
269 	j = 0;
270 	for (i = 0; i < mntsize; i++) {
271 		if (!aflag && (mntbuf[i].f_flags & MNT_IGNORE) != 0)
272 			continue;
273 		if (lflag && (mntbuf[i].f_flags & MNT_LOCAL) == 0)
274 			continue;
275 		if (!selected(mntbuf[i].f_fstypename))
276 			continue;
277 		if (nflag)
278 			mntbuf[j] = mntbuf[i];
279 		else {
280 			struct statfs layerbuf = mntbuf[i];
281 			(void)statfs(mntbuf[i].f_mntonname, &mntbuf[j]);
282 			/*
283 			 * If the FS name changed, then new data is for
284 			 * a different layer and we don't want it.
285 			 */
286 			if (memcmp(layerbuf.f_mntfromname,
287 			    mntbuf[j].f_mntfromname, MNAMELEN))
288 				mntbuf[j] = layerbuf;
289 		}
290 		j++;
291 	}
292 	return (j);
293 }
294 
295 void
296 prthumanval(int64_t bytes, char *pad)
297 {
298 	char buf[5];
299 
300 	humanize_number(buf, sizeof(buf), bytes, "", HN_AUTOSCALE,
301 	    HN_B | HN_NOSPACE | HN_DECIMAL);
302 
303 	(void)printf("%s %6s", pad, buf);
304 }
305 
306 void
307 prthuman(struct statfs *sfsp, long used)
308 {
309        prthumanval((int64_t)(sfsp->f_blocks) * (int64_t)(sfsp->f_bsize), "");
310        prthumanval((int64_t)(used) * (int64_t)(sfsp->f_bsize), "  ");
311        prthumanval((int64_t)(sfsp->f_bavail) * (int64_t)(sfsp->f_bsize), "   ");
312 }
313 
314 
315 /*
316  * Convert statfs returned filesystem size into BLOCKSIZE units.
317  * Attempts to avoid overflow for large filesystems.
318  */
319 #define fsbtoblk(num, fsbs, bs)					\
320 	(((fsbs) != 0 && (fsbs) < (bs)) ?			\
321 	    (num) / ((bs) / (fsbs)) : (num) * ((fsbs) / (bs)))
322 
323 /*
324  * Print out status about a filesystem.
325  */
326 void
327 prtstat(struct statfs *sfsp, int maxwidth)
328 {
329 	static long blocksize;
330 	static int headerlen, timesthrough;
331 	static char *header;
332 	long used, availblks, inodes;
333 	static char *full = "100%";
334 
335 	if (maxwidth < 11)
336 		maxwidth = 11;
337 	if (++timesthrough == 1) {
338 		if (kflag) {
339 			blocksize = 1024;
340 			header = Pflag ? "1024-blocks" : "1K-blocks";
341 			headerlen = strlen(header);
342 		} else if (mflag) {
343 			blocksize = 1024 * 1024;
344 			header = Pflag ? "1048576-blocks" : "1M-blocks";
345 			headerlen = strlen(header);
346 		} else if (hflag) {
347 			header = "  Size";
348 			headerlen = strlen(header);
349 		} else
350 			header = getbsize(&headerlen, &blocksize);
351 		(void)printf("%-*.*s %s     Used %9s Capacity",
352 		    maxwidth, maxwidth, "Filesystem", header,
353 		    Pflag ? "Available" : "Avail");
354 		if (iflag)
355 			(void)printf(" iused   ifree  %%iused");
356 		(void)printf("  Mounted on\n");
357 	}
358 	(void)printf("%-*.*s", maxwidth, maxwidth, sfsp->f_mntfromname);
359 	used = sfsp->f_blocks - sfsp->f_bfree;
360 	availblks = sfsp->f_bavail + used;
361 	if (hflag)
362 		prthuman(sfsp, used);
363 	else
364 		(void)printf(" %*ld %8ld %9ld", headerlen,
365 		    fsbtoblk(sfsp->f_blocks, sfsp->f_bsize, blocksize),
366 		    fsbtoblk(used, sfsp->f_bsize, blocksize),
367 		    fsbtoblk(sfsp->f_bavail, sfsp->f_bsize, blocksize));
368 	(void)printf("%7s",
369 	    availblks == 0 ? full : strpct((u_long)used, (u_long)availblks, 0));
370 	if (iflag) {
371 		inodes = sfsp->f_files;
372 		used = inodes - sfsp->f_ffree;
373 		(void)printf(" %7ld %7ld %6s ", used, sfsp->f_ffree,
374 		    inodes == 0 ? full :
375 		    strpct((u_long)used, (u_long)inodes, 0));
376 	} else
377 		(void)printf("  ");
378 	(void)printf("  %s\n", sfsp->f_mntonname);
379 }
380 
381 void
382 usage(void)
383 {
384 
385 	(void)fprintf(stderr,
386 	    "Usage: %s [-aiklmnP] [-t type] [file | file_system ...]\n",
387 	    getprogname());
388 	exit(1);
389 	/* NOTREACHED */
390 }
391