df.c revision 287790 
1/*-
2 * Copyright (c) 1980, 1990, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#if 0
36#ifndef lint
37static const char copyright[] =
38"@(#) Copyright (c) 1980, 1990, 1993, 1994\n\
39	The Regents of the University of California.  All rights reserved.\n";
40#endif /* not lint */
41
42#ifndef lint
43static char sccsid[] = "@(#)df.c	8.9 (Berkeley) 5/8/95";
44#endif /* not lint */
45#endif
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD: stable/10/bin/df/df.c 287790 2015-09-14 17:40:57Z delphij $");
48
49#include <sys/param.h>
50#include <sys/stat.h>
51#include <sys/mount.h>
52#include <sys/sysctl.h>
53#include <ufs/ufs/ufsmount.h>
54#include <err.h>
55#include <libutil.h>
56#include <locale.h>
57#include <stdint.h>
58#include <stdio.h>
59#include <stdlib.h>
60#include <string.h>
61#include <sysexits.h>
62#include <unistd.h>
63
64#include "extern.h"
65
66#define UNITS_SI	1
67#define UNITS_2		2
68
69/* Maximum widths of various fields. */
70struct maxwidths {
71	int	mntfrom;
72	int	fstype;
73	int	total;
74	int	used;
75	int	avail;
76	int	iused;
77	int	ifree;
78};
79
80static void	  addstat(struct statfs *, struct statfs *);
81static char	 *getmntpt(const char *);
82static int	  int64width(int64_t);
83static char	 *makenetvfslist(void);
84static void	  prthuman(const struct statfs *, int64_t);
85static void	  prthumanval(int64_t);
86static intmax_t	  fsbtoblk(int64_t, uint64_t, u_long);
87static void	  prtstat(struct statfs *, struct maxwidths *);
88static size_t	  regetmntinfo(struct statfs **, long, const char **);
89static void	  update_maxwidths(struct maxwidths *, const struct statfs *);
90static void	  usage(void);
91
92static __inline int
93imax(int a, int b)
94{
95	return (a > b ? a : b);
96}
97
98static int	aflag = 0, cflag, hflag, iflag, kflag, lflag = 0, nflag, Tflag;
99static int	thousands;
100static struct	ufs_args mdev;
101
102int
103main(int argc, char *argv[])
104{
105	struct stat stbuf;
106	struct statfs statfsbuf, totalbuf;
107	struct maxwidths maxwidths;
108	struct statfs *mntbuf;
109	const char *fstype;
110	char *mntpath, *mntpt;
111	const char **vfslist;
112	int i, mntsize;
113	int ch, rv;
114
115	fstype = "ufs";
116	(void)setlocale(LC_ALL, "");
117	memset(&maxwidths, 0, sizeof(maxwidths));
118	memset(&totalbuf, 0, sizeof(totalbuf));
119	totalbuf.f_bsize = DEV_BSIZE;
120	strlcpy(totalbuf.f_mntfromname, "total", MNAMELEN);
121	vfslist = NULL;
122	while ((ch = getopt(argc, argv, "abcgHhiklmnPt:T,")) != -1)
123		switch (ch) {
124		case 'a':
125			aflag = 1;
126			break;
127		case 'b':
128				/* FALLTHROUGH */
129		case 'P':
130			/*
131			 * POSIX specifically discusses the behavior of
132			 * both -k and -P. It states that the blocksize should
133			 * be set to 1024. Thus, if this occurs, simply break
134			 * rather than clobbering the old blocksize.
135			 */
136			if (kflag)
137				break;
138			setenv("BLOCKSIZE", "512", 1);
139			hflag = 0;
140			break;
141		case 'c':
142			cflag = 1;
143			break;
144		case 'g':
145			setenv("BLOCKSIZE", "1g", 1);
146			hflag = 0;
147			break;
148		case 'H':
149			hflag = UNITS_SI;
150			break;
151		case 'h':
152			hflag = UNITS_2;
153			break;
154		case 'i':
155			iflag = 1;
156			break;
157		case 'k':
158			kflag++;
159			setenv("BLOCKSIZE", "1024", 1);
160			hflag = 0;
161			break;
162		case 'l':
163			if (vfslist != NULL)
164				errx(1, "-l and -t are mutually exclusive.");
165			vfslist = makevfslist(makenetvfslist());
166			lflag = 1;
167			break;
168		case 'm':
169			setenv("BLOCKSIZE", "1m", 1);
170			hflag = 0;
171			break;
172		case 'n':
173			nflag = 1;
174			break;
175		case 't':
176			if (lflag)
177				errx(1, "-l and -t are mutually exclusive.");
178			if (vfslist != NULL)
179				errx(1, "only one -t option may be specified");
180			fstype = optarg;
181			vfslist = makevfslist(optarg);
182			break;
183		case 'T':
184			Tflag = 1;
185			break;
186		case ',':
187			thousands = 1;
188			break;
189		case '?':
190		default:
191			usage();
192		}
193	argc -= optind;
194	argv += optind;
195
196	rv = 0;
197	if (!*argv) {
198		/* everything (modulo -t) */
199		mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
200		mntsize = regetmntinfo(&mntbuf, mntsize, vfslist);
201	} else {
202		/* just the filesystems specified on the command line */
203		mntbuf = malloc(argc * sizeof(*mntbuf));
204		if (mntbuf == NULL)
205			err(1, "malloc()");
206		mntsize = 0;
207		/* continued in for loop below */
208	}
209
210	/* iterate through specified filesystems */
211	for (; *argv; argv++) {
212		if (stat(*argv, &stbuf) < 0) {
213			if ((mntpt = getmntpt(*argv)) == NULL) {
214				warn("%s", *argv);
215				rv = 1;
216				continue;
217			}
218		} else if (S_ISCHR(stbuf.st_mode)) {
219			if ((mntpt = getmntpt(*argv)) == NULL) {
220				mdev.fspec = *argv;
221				mntpath = strdup("/tmp/df.XXXXXX");
222				if (mntpath == NULL) {
223					warn("strdup failed");
224					rv = 1;
225					continue;
226				}
227				mntpt = mkdtemp(mntpath);
228				if (mntpt == NULL) {
229					warn("mkdtemp(\"%s\") failed", mntpath);
230					rv = 1;
231					free(mntpath);
232					continue;
233				}
234				if (mount(fstype, mntpt, MNT_RDONLY,
235				    &mdev) != 0) {
236					warn("%s", *argv);
237					rv = 1;
238					(void)rmdir(mntpt);
239					free(mntpath);
240					continue;
241				} else if (statfs(mntpt, &statfsbuf) == 0) {
242					statfsbuf.f_mntonname[0] = '\0';
243					prtstat(&statfsbuf, &maxwidths);
244					if (cflag)
245						addstat(&totalbuf, &statfsbuf);
246				} else {
247					warn("%s", *argv);
248					rv = 1;
249				}
250				(void)unmount(mntpt, 0);
251				(void)rmdir(mntpt);
252				free(mntpath);
253				continue;
254			}
255		} else
256			mntpt = *argv;
257
258		/*
259		 * Statfs does not take a `wait' flag, so we cannot
260		 * implement nflag here.
261		 */
262		if (statfs(mntpt, &statfsbuf) < 0) {
263			warn("%s", mntpt);
264			rv = 1;
265			continue;
266		}
267
268		/*
269		 * Check to make sure the arguments we've been given are
270		 * satisfied.  Return an error if we have been asked to
271		 * list a mount point that does not match the other args
272		 * we've been given (-l, -t, etc.).
273		 */
274		if (checkvfsname(statfsbuf.f_fstypename, vfslist)) {
275			rv = 1;
276			continue;
277		}
278
279		/* the user asked for it, so ignore the ignore flag */
280		statfsbuf.f_flags &= ~MNT_IGNORE;
281
282		/* add to list */
283		mntbuf[mntsize++] = statfsbuf;
284	}
285
286	memset(&maxwidths, 0, sizeof(maxwidths));
287	for (i = 0; i < mntsize; i++) {
288		if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0) {
289			update_maxwidths(&maxwidths, &mntbuf[i]);
290			if (cflag)
291				addstat(&totalbuf, &mntbuf[i]);
292		}
293	}
294	for (i = 0; i < mntsize; i++)
295		if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0)
296			prtstat(&mntbuf[i], &maxwidths);
297	if (cflag)
298		prtstat(&totalbuf, &maxwidths);
299	exit(rv);
300}
301
302static char *
303getmntpt(const char *name)
304{
305	size_t mntsize, i;
306	struct statfs *mntbuf;
307
308	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
309	for (i = 0; i < mntsize; i++) {
310		if (!strcmp(mntbuf[i].f_mntfromname, name))
311			return (mntbuf[i].f_mntonname);
312	}
313	return (NULL);
314}
315
316/*
317 * Make a pass over the file system info in ``mntbuf'' filtering out
318 * file system types not in vfslist and possibly re-stating to get
319 * current (not cached) info.  Returns the new count of valid statfs bufs.
320 */
321static size_t
322regetmntinfo(struct statfs **mntbufp, long mntsize, const char **vfslist)
323{
324	int error, i, j;
325	struct statfs *mntbuf;
326
327	if (vfslist == NULL)
328		return (nflag ? mntsize : getmntinfo(mntbufp, MNT_WAIT));
329
330	mntbuf = *mntbufp;
331	for (j = 0, i = 0; i < mntsize; i++) {
332		if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
333			continue;
334		/*
335		 * XXX statfs(2) can fail for various reasons. It may be
336		 * possible that the user does not have access to the
337		 * pathname, if this happens, we will fall back on
338		 * "stale" filesystem statistics.
339		 */
340		error = statfs(mntbuf[i].f_mntonname, &mntbuf[j]);
341		if (nflag || error < 0)
342			if (i != j) {
343				if (error < 0)
344					warnx("%s stats possibly stale",
345					    mntbuf[i].f_mntonname);
346				mntbuf[j] = mntbuf[i];
347			}
348		j++;
349	}
350	return (j);
351}
352
353static void
354prthuman(const struct statfs *sfsp, int64_t used)
355{
356
357	prthumanval(sfsp->f_blocks * sfsp->f_bsize);
358	prthumanval(used * sfsp->f_bsize);
359	prthumanval(sfsp->f_bavail * sfsp->f_bsize);
360}
361
362static void
363prthumanval(int64_t bytes)
364{
365	char buf[6];
366	int flags;
367
368	flags = HN_B | HN_NOSPACE | HN_DECIMAL;
369	if (hflag == UNITS_SI)
370		flags |= HN_DIVISOR_1000;
371
372	humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
373	    bytes, "", HN_AUTOSCALE, flags);
374
375	(void)printf("  %6s", buf);
376}
377
378/*
379 * Print an inode count in "human-readable" format.
380 */
381static void
382prthumanvalinode(int64_t bytes)
383{
384	char buf[6];
385	int flags;
386
387	flags = HN_NOSPACE | HN_DECIMAL | HN_DIVISOR_1000;
388
389	humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
390	    bytes, "", HN_AUTOSCALE, flags);
391
392	(void)printf(" %5s", buf);
393}
394
395/*
396 * Convert statfs returned file system size into BLOCKSIZE units.
397 */
398static intmax_t
399fsbtoblk(int64_t num, uint64_t fsbs, u_long bs)
400{
401	return (num * (intmax_t) fsbs / (int64_t) bs);
402}
403
404/*
405 * Print out status about a file system.
406 */
407static void
408prtstat(struct statfs *sfsp, struct maxwidths *mwp)
409{
410	static long blocksize;
411	static int headerlen, timesthrough = 0;
412	static const char *header;
413	int64_t used, availblks, inodes;
414	const char *format;
415
416	if (++timesthrough == 1) {
417		mwp->mntfrom = imax(mwp->mntfrom, (int)strlen("Filesystem"));
418		mwp->fstype = imax(mwp->fstype, (int)strlen("Type"));
419		if (thousands) {		/* make space for commas */
420		    mwp->total += (mwp->total - 1) / 3;
421		    mwp->used  += (mwp->used - 1) / 3;
422		    mwp->avail += (mwp->avail - 1) / 3;
423		    mwp->iused += (mwp->iused - 1) / 3;
424		    mwp->ifree += (mwp->ifree - 1) / 3;
425		}
426		if (hflag) {
427			header = "   Size";
428			mwp->total = mwp->used = mwp->avail =
429			    (int)strlen(header);
430		} else {
431			header = getbsize(&headerlen, &blocksize);
432			mwp->total = imax(mwp->total, headerlen);
433		}
434		mwp->used = imax(mwp->used, (int)strlen("Used"));
435		mwp->avail = imax(mwp->avail, (int)strlen("Avail"));
436
437		(void)printf("%-*s", mwp->mntfrom, "Filesystem");
438		if (Tflag)
439			(void)printf("  %-*s", mwp->fstype, "Type");
440		(void)printf(" %*s %*s %*s Capacity", mwp->total, header,
441		    mwp->used, "Used", mwp->avail, "Avail");
442		if (iflag) {
443			mwp->iused = imax(hflag ? 0 : mwp->iused,
444			    (int)strlen("  iused"));
445			mwp->ifree = imax(hflag ? 0 : mwp->ifree,
446			    (int)strlen("ifree"));
447			(void)printf(" %*s %*s %%iused",
448			    mwp->iused - 2, "iused", mwp->ifree, "ifree");
449		}
450		(void)printf("  Mounted on\n");
451	}
452	/* Check for 0 block size.  Can this happen? */
453	if (sfsp->f_bsize == 0) {
454		warnx ("File system %s does not have a block size, assuming 512.",
455		    sfsp->f_mntonname);
456		sfsp->f_bsize = 512;
457	}
458	(void)printf("%-*s", mwp->mntfrom, sfsp->f_mntfromname);
459	if (Tflag)
460		(void)printf("  %-*s", mwp->fstype, sfsp->f_fstypename);
461	used = sfsp->f_blocks - sfsp->f_bfree;
462	availblks = sfsp->f_bavail + used;
463	if (hflag) {
464		prthuman(sfsp, used);
465	} else {
466		if (thousands)
467		    format = " %*j'd %*j'd %*j'd";
468		else
469		    format = " %*jd %*jd %*jd";
470		(void)printf(format,
471		    mwp->total, fsbtoblk(sfsp->f_blocks,
472		    sfsp->f_bsize, blocksize),
473		    mwp->used, fsbtoblk(used, sfsp->f_bsize, blocksize),
474		    mwp->avail, fsbtoblk(sfsp->f_bavail,
475		    sfsp->f_bsize, blocksize));
476	}
477	(void)printf(" %5.0f%%",
478	    availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
479	if (iflag) {
480		inodes = sfsp->f_files;
481		used = inodes - sfsp->f_ffree;
482		if (hflag) {
483			(void)printf("  ");
484			prthumanvalinode(used);
485			prthumanvalinode(sfsp->f_ffree);
486		} else {
487			if (thousands)
488			    format = " %*j'd %*j'd";
489			else
490			    format = " %*jd %*jd";
491			(void)printf(format, mwp->iused, (intmax_t)used,
492			    mwp->ifree, (intmax_t)sfsp->f_ffree);
493		}
494		(void)printf(" %4.0f%% ", inodes == 0 ? 100.0 :
495		    (double)used / (double)inodes * 100.0);
496	} else
497		(void)printf("  ");
498	if (strncmp(sfsp->f_mntfromname, "total", MNAMELEN) != 0)
499		(void)printf("  %s", sfsp->f_mntonname);
500	(void)printf("\n");
501}
502
503static void
504addstat(struct statfs *totalfsp, struct statfs *statfsp)
505{
506	uint64_t bsize;
507
508	bsize = statfsp->f_bsize / totalfsp->f_bsize;
509	totalfsp->f_blocks += statfsp->f_blocks * bsize;
510	totalfsp->f_bfree += statfsp->f_bfree * bsize;
511	totalfsp->f_bavail += statfsp->f_bavail * bsize;
512	totalfsp->f_files += statfsp->f_files;
513	totalfsp->f_ffree += statfsp->f_ffree;
514}
515
516/*
517 * Update the maximum field-width information in `mwp' based on
518 * the file system specified by `sfsp'.
519 */
520static void
521update_maxwidths(struct maxwidths *mwp, const struct statfs *sfsp)
522{
523	static long blocksize = 0;
524	int dummy;
525
526	if (blocksize == 0)
527		getbsize(&dummy, &blocksize);
528
529	mwp->mntfrom = imax(mwp->mntfrom, (int)strlen(sfsp->f_mntfromname));
530	mwp->fstype = imax(mwp->fstype, (int)strlen(sfsp->f_fstypename));
531	mwp->total = imax(mwp->total, int64width(
532	    fsbtoblk((int64_t)sfsp->f_blocks, sfsp->f_bsize, blocksize)));
533	mwp->used = imax(mwp->used,
534	    int64width(fsbtoblk((int64_t)sfsp->f_blocks -
535	    (int64_t)sfsp->f_bfree, sfsp->f_bsize, blocksize)));
536	mwp->avail = imax(mwp->avail, int64width(fsbtoblk(sfsp->f_bavail,
537	    sfsp->f_bsize, blocksize)));
538	mwp->iused = imax(mwp->iused, int64width((int64_t)sfsp->f_files -
539	    sfsp->f_ffree));
540	mwp->ifree = imax(mwp->ifree, int64width(sfsp->f_ffree));
541}
542
543/* Return the width in characters of the specified value. */
544static int
545int64width(int64_t val)
546{
547	int len;
548
549	len = 0;
550	/* Negative or zero values require one extra digit. */
551	if (val <= 0) {
552		val = -val;
553		len++;
554	}
555	while (val > 0) {
556		len++;
557		val /= 10;
558	}
559
560	return (len);
561}
562
563static void
564usage(void)
565{
566
567	(void)fprintf(stderr,
568"usage: df [-b | -g | -H | -h | -k | -m | -P] [-acilnT] [-t type] [-,]\n"
569"          [file | filesystem ...]\n");
570	exit(EX_USAGE);
571}
572
573static char *
574makenetvfslist(void)
575{
576	char *str, *strptr, **listptr;
577	struct xvfsconf *xvfsp, *keep_xvfsp;
578	size_t buflen;
579	int cnt, i, maxvfsconf;
580
581	if (sysctlbyname("vfs.conflist", NULL, &buflen, NULL, 0) < 0) {
582		warn("sysctl(vfs.conflist)");
583		return (NULL);
584	}
585	xvfsp = malloc(buflen);
586	if (xvfsp == NULL) {
587		warnx("malloc failed");
588		return (NULL);
589	}
590	keep_xvfsp = xvfsp;
591	if (sysctlbyname("vfs.conflist", xvfsp, &buflen, NULL, 0) < 0) {
592		warn("sysctl(vfs.conflist)");
593		free(keep_xvfsp);
594		return (NULL);
595	}
596	maxvfsconf = buflen / sizeof(struct xvfsconf);
597
598	if ((listptr = malloc(sizeof(char*) * maxvfsconf)) == NULL) {
599		warnx("malloc failed");
600		free(keep_xvfsp);
601		return (NULL);
602	}
603
604	for (cnt = 0, i = 0; i < maxvfsconf; i++) {
605		if (xvfsp->vfc_flags & VFCF_NETWORK) {
606			listptr[cnt++] = strdup(xvfsp->vfc_name);
607			if (listptr[cnt-1] == NULL) {
608				warnx("malloc failed");
609				free(listptr);
610				free(keep_xvfsp);
611				return (NULL);
612			}
613		}
614		xvfsp++;
615	}
616
617	if (cnt == 0 ||
618	    (str = malloc(sizeof(char) * (32 * cnt + cnt + 2))) == NULL) {
619		if (cnt > 0)
620			warnx("malloc failed");
621		free(listptr);
622		free(keep_xvfsp);
623		return (NULL);
624	}
625
626	*str = 'n'; *(str + 1) = 'o';
627	for (i = 0, strptr = str + 2; i < cnt; i++, strptr++) {
628		strlcpy(strptr, listptr[i], 32);
629		strptr += strlen(listptr[i]);
630		*strptr = ',';
631		free(listptr[i]);
632	}
633	*(--strptr) = '\0';
634
635	free(keep_xvfsp);
636	free(listptr);
637	return (str);
638}
639