1/* $NetBSD: df.c,v 1.93 2018/08/26 23:34:52 sevan 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. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#include <sys/cdefs.h>
38#ifndef lint
39__COPYRIGHT(
40"@(#) Copyright (c) 1980, 1990, 1993, 1994\
41 The Regents of the University of California. All rights reserved.");
42#endif /* not lint */
43
44#ifndef lint
45#if 0
46static char sccsid[] = "@(#)df.c 8.7 (Berkeley) 4/2/94";
47#else
48__RCSID("$NetBSD: df.c,v 1.93 2018/08/26 23:34:52 sevan Exp $");
49#endif
50#endif /* not lint */
51
52#include <sys/param.h>
53#include <sys/stat.h>
54#include <sys/mount.h>
55
56#include <assert.h>
57#include <err.h>
58#include <errno.h>
59#include <fcntl.h>
60#include <locale.h>
61#include <util.h>
62#include <stdio.h>
63#include <stdlib.h>
64#include <string.h>
65#include <unistd.h>
66#include <util.h>
67
68static char *getmntpt(const char *);
69static void prtstat(struct statvfs *, int);
70static int selected(const char *, size_t);
71static void maketypelist(char *);
72static size_t regetmntinfo(struct statvfs **, size_t);
73__dead static void usage(void);
74static void prthumanval(int64_t, const char *);
75static void prthuman(struct statvfs *, int64_t, int64_t);
76
77static int aflag, gflag, hflag, iflag, lflag, nflag, Pflag;
78static long usize;
79static char **typelist;
80
81int
82main(int argc, char *argv[])
83{
84 struct stat stbuf;
85 struct statvfs *mntbuf;
86 long mntsize;
87 int ch, i, maxwidth, width;
88 char *mntpt;
89
90 setprogname(argv[0]);
91 (void)setlocale(LC_ALL, "");
92
93 while ((ch = getopt(argc, argv, "aGghiklmnPt:")) != -1)
94 switch (ch) {
95 case 'a':
96 aflag = 1;
97 break;
98 case 'g':
99 hflag = 0;
100 usize = 1024 * 1024 * 1024;
101 break;
102 case 'G':
103 gflag = 1;
104 break;
105 case 'h':
106 hflag = 1;
107 usize = 0;
108 break;
109 case 'i':
110 iflag = 1;
111 break;
112 case 'k':
113 hflag = 0;
114 usize = 1024;
115 break;
116 case 'l':
117 lflag = 1;
118 break;
119 case 'm':
120 hflag = 0;
121 usize = 1024 * 1024;
122 break;
123 case 'n':
124 nflag = 1;
125 break;
126 case 'P':
127 Pflag = 1;
128 break;
129 case 't':
130 if (typelist != NULL)
131 errx(EXIT_FAILURE,
132 "only one -t option may be specified.");
133 maketypelist(optarg);
134 break;
135 case '?':
136 default:
137 usage();
138 }
139
140 if (gflag && (Pflag || iflag))
141 errx(EXIT_FAILURE,
142 "only one of -G and -P or -i may be specified");
143 if (Pflag && iflag)
144 errx(EXIT_FAILURE,
145 "only one of -P and -i may be specified");
146#if 0
147 /*
148 * The block size cannot be checked until after getbsize() is called.
149 */
150 if (Pflag && (hflag || (usize != 1024 && usize != 512)))
151 errx(EXIT_FAILURE,
152 "non-standard block size incompatible with -P");
153#endif
154 argc -= optind;
155 argv += optind;
156
157 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
158 if (mntsize == 0)
159 err(EXIT_FAILURE,
160 "retrieving information on mounted file systems");
161
162 if (*argv == NULL) {
163 mntsize = regetmntinfo(&mntbuf, mntsize);
164 } else {
165 if ((mntbuf = malloc(argc * sizeof(*mntbuf))) == NULL)
166 err(EXIT_FAILURE, "can't allocate statvfs array");
167 mntsize = 0;
168 for (/*EMPTY*/; *argv != NULL; argv++) {
169 if (stat(*argv, &stbuf) < 0) {
170 if ((mntpt = getmntpt(*argv)) == 0) {
171 warn("%s", *argv);
172 continue;
173 }
174 } else if (S_ISBLK(stbuf.st_mode)) {
175 if ((mntpt = getmntpt(*argv)) == 0)
176 mntpt = *argv;
177 } else
178 mntpt = *argv;
179 /*
180 * Statfs does not take a `wait' flag, so we cannot
181 * implement nflag here.
182 */
183 if (!statvfs(mntpt, &mntbuf[mntsize]))
184 if (lflag &&
185 (mntbuf[mntsize].f_flag & MNT_LOCAL) == 0)
186 warnx("Warning: %s is not a local %s",
187 *argv, "file system");
188 else if
189 (!selected(mntbuf[mntsize].f_fstypename,
190 sizeof(mntbuf[mntsize].f_fstypename)))
191 warnx("Warning: %s mounted as a %s %s",
192 *argv,
193 mntbuf[mntsize].f_fstypename,
194 "file system");
195 else
196 ++mntsize;
197 else
198 warn("%s", *argv);
199 }
200 }
201
202 maxwidth = 0;
203 for (i = 0; i < mntsize; i++) {
204 width = (int)strlen(mntbuf[i].f_mntfromname);
205 if (width > maxwidth)
206 maxwidth = width;
207 }
208 for (i = 0; i < mntsize; i++)
209 prtstat(&mntbuf[i], maxwidth);
210 return 0;
211}
212
213static char *
214getmntpt(const char *name)
215{
216 size_t mntsize, i;
217 struct statvfs *mntbuf;
218
219 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
220 if (mntsize == 0)
221 err(EXIT_FAILURE, "Can't get mount information");
222 for (i = 0; i < mntsize; i++) {
223 if (!strcmp(mntbuf[i].f_mntfromname, name))
224 return mntbuf[i].f_mntonname;
225 }
226 return 0;
227}
228
229static enum { IN_LIST, NOT_IN_LIST } which;
230
231static int
232selected(const char *type, size_t len)
233{
234 char **av;
235
236 /* If no type specified, it's always selected. */
237 if (typelist == NULL)
238 return 1;
239 for (av = typelist; *av != NULL; ++av)
240 if (!strncmp(type, *av, len))
241 return which == IN_LIST ? 1 : 0;
242 return which == IN_LIST ? 0 : 1;
243}
244
245static void
246maketypelist(char *fslist)
247{
248 size_t i;
249 char *nextcp, **av;
250
251 if ((fslist == NULL) || (fslist[0] == '\0'))
252 errx(EXIT_FAILURE, "empty type list");
253
254 /*
255 * XXX
256 * Note: the syntax is "noxxx,yyy" for no xxx's and
257 * no yyy's, not the more intuitive "noyyy,noyyy".
258 */
259 if (fslist[0] == 'n' && fslist[1] == 'o') {
260 fslist += 2;
261 which = NOT_IN_LIST;
262 } else
263 which = IN_LIST;
264
265 /* Count the number of types. */
266 for (i = 1, nextcp = fslist;
267 (nextcp = strchr(nextcp, ',')) != NULL; i++)
268 ++nextcp;
269
270 /* Build an array of that many types. */
271 if ((av = typelist = malloc((i + 1) * sizeof(*av))) == NULL)
272 err(EXIT_FAILURE, "can't allocate type array");
273 av[0] = fslist;
274 for (i = 1, nextcp = fslist;
275 (nextcp = strchr(nextcp, ',')) != NULL; i++) {
276 *nextcp = '\0';
277 av[i] = ++nextcp;
278 }
279 /* Terminate the array. */
280 av[i] = NULL;
281}
282
283/*
284 * Make a pass over the filesystem info in ``mntbuf'' filtering out
285 * filesystem types not in ``fsmask'' and possibly re-stating to get
286 * current (not cached) info. Returns the new count of valid statvfs bufs.
287 */
288static size_t
289regetmntinfo(struct statvfs **mntbufp, size_t mntsize)
290{
291 size_t i, j;
292 struct statvfs *mntbuf;
293
294 if (!lflag && typelist == NULL && aflag)
295 return nflag ? mntsize : (size_t)getmntinfo(mntbufp, MNT_WAIT);
296
297 mntbuf = *mntbufp;
298 j = 0;
299 for (i = 0; i < mntsize; i++) {
300 if (!aflag && (mntbuf[i].f_flag & MNT_IGNORE) != 0)
301 continue;
302 if (lflag && (mntbuf[i].f_flag & MNT_LOCAL) == 0)
303 continue;
304 if (!selected(mntbuf[i].f_fstypename,
305 sizeof(mntbuf[i].f_fstypename)))
306 continue;
307 if (nflag)
308 mntbuf[j] = mntbuf[i];
309 else {
310 struct statvfs layerbuf = mntbuf[i];
311 (void)statvfs(mntbuf[i].f_mntonname, &mntbuf[j]);
312 /*
313 * If the FS name changed, then new data is for
314 * a different layer and we don't want it.
315 */
316 if (memcmp(layerbuf.f_mntfromname,
317 mntbuf[j].f_mntfromname, MNAMELEN))
318 mntbuf[j] = layerbuf;
319 }
320 j++;
321 }
322 return j;
323}
324
325static void
326prthumanval(int64_t bytes, const char *pad)
327{
328 char buf[6];
329
330 (void)humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
331 bytes, "", HN_AUTOSCALE,
332 HN_B | HN_NOSPACE | HN_DECIMAL);
333
334 (void)printf("%s %6s", pad, buf);
335}
336
337static void
338prthuman(struct statvfs *sfsp, int64_t used, int64_t bavail)
339{
340
341 prthumanval((int64_t)(sfsp->f_blocks * sfsp->f_frsize), " ");
342 prthumanval((int64_t)(used * sfsp->f_frsize), " ");
343 prthumanval((int64_t)(bavail * sfsp->f_frsize), " ");
344}
345
346/*
347 * Convert statvfs returned filesystem size into BLOCKSIZE units.
348 * Attempts to avoid overflow for large filesystems.
349 */
350#define fsbtoblk(num, fsbs, bs) \
351 (((fsbs) != 0 && (uint64_t)(fsbs) < (uint64_t)(bs)) ? \
352 (int64_t)(num) / (int64_t)((bs) / (fsbs)) : \
353 (int64_t)(num) * (int64_t)((fsbs) / (bs)))
354
355/*
356 * Print out status about a filesystem.
357 */
358static void
359prtstat(struct statvfs *sfsp, int maxwidth)
360{
361 static long blocksize;
362 static int headerlen, timesthrough;
363 static const char *header;
364 static const char full[] = "100";
365 static const char empty[] = " 0";
366 int64_t used, availblks, inodes;
367 int64_t bavail;
368 char pb[64];
369
370 if (gflag) {
371 /*
372 * From SunOS-5.6:
373 *
374 * /var (/dev/dsk/c0t0d0s3 ): 8192 block size 1024 frag size
375 * 984242 total blocks 860692 free blocks 859708 available 249984 total files
376 * 248691 free files 8388611 filesys id
377 * ufs fstype 0x00000004 flag 255 filename length
378 *
379 */
380 (void)printf("%10s (%-12s): %7ld block size %12ld frag size\n",
381 sfsp->f_mntonname, sfsp->f_mntfromname,
382 sfsp->f_bsize, /* On UFS/FFS systems this is
383 * also called the "optimal
384 * transfer block size" but it
385 * is of course the file
386 * system's block size too.
387 */
388 sfsp->f_frsize); /* not so surprisingly the
389 * "fundamental file system
390 * block size" is the frag
391 * size.
392 */
393 (void)printf("%10" PRId64 " total blocks %10" PRId64
394 " free blocks %10" PRId64 " available\n",
395 (uint64_t)sfsp->f_blocks, (uint64_t)sfsp->f_bfree,
396 (uint64_t)sfsp->f_bavail);
397 (void)printf("%10" PRId64 " total files %10" PRId64
398 " free files %12lx filesys id\n",
399 (uint64_t)sfsp->f_ffree, (uint64_t)sfsp->f_files,
400 sfsp->f_fsid);
401 (void)printf("%10s fstype %#15lx flag %17ld filename "
402 "length\n", sfsp->f_fstypename, sfsp->f_flag,
403 sfsp->f_namemax);
404 (void)printf("%10lu owner %17" PRId64 " syncwrites %12" PRId64
405 " asyncwrites\n\n", (unsigned long)sfsp->f_owner,
406 sfsp->f_syncwrites, sfsp->f_asyncwrites);
407
408 /*
409 * a concession by the structured programming police to the
410 * indentation police....
411 */
412 return;
413 }
414 if (maxwidth < 12)
415 maxwidth = 12;
416 if (++timesthrough == 1) {
417 switch (blocksize = usize) {
418 case 1024:
419 header = Pflag ? "1024-blocks" : "1K-blocks";
420 headerlen = (int)strlen(header);
421 break;
422 case 1024 * 1024:
423 header = "1M-blocks";
424 headerlen = (int)strlen(header);
425 break;
426 case 1024 * 1024 * 1024:
427 header = "1G-blocks";
428 headerlen = (int)strlen(header);
429 break;
430 default:
431 if (hflag) {
432 header = "Size";
433 headerlen = (int)strlen(header);
434 } else
435 header = getbsize(&headerlen, &blocksize);
436 break;
437 }
438 if (Pflag) {
439 /*
440 * either:
441 * "Filesystem 1024-blocks Used Available Capacity Mounted on\n"
442 * or:
443 * "Filesystem 512-blocks Used Available Capacity Mounted on\n"
444 */
445 if (blocksize != 1024 && blocksize != 512)
446 errx(EXIT_FAILURE,
447 "non-standard block size incompatible with -P");
448 (void)printf("Filesystem %s Used Available Capacity "
449 "Mounted on\n", header);
450 } else {
451 (void)printf("%-*.*s %s Used Avail %%Cap",
452 maxwidth - (headerlen - 10),
453 maxwidth - (headerlen - 10),
454 "Filesystem", header);
455 if (iflag)
456 (void)printf(" iUsed iAvail %%iCap");
457 (void)printf(" Mounted on\n");
458 }
459 }
460 used = sfsp->f_blocks - sfsp->f_bfree;
461 bavail = sfsp->f_bfree - sfsp->f_bresvd;
462 availblks = bavail + used;
463 if (Pflag) {
464 assert(hflag == 0);
465 assert(blocksize > 0);
466 /*
467 * "%s %d %d %d %s %s\n", <file system name>, <total space>,
468 * <space used>, <space free>, <percentage used>,
469 * <file system root>
470 */
471 (void)printf("%s %" PRId64 " %" PRId64 " %" PRId64 " %s%% %s\n",
472 sfsp->f_mntfromname,
473 fsbtoblk(sfsp->f_blocks, sfsp->f_frsize, blocksize),
474 fsbtoblk(used, sfsp->f_frsize, blocksize),
475 fsbtoblk(bavail, sfsp->f_frsize, blocksize),
476 availblks == 0 ? full : strspct(pb, sizeof(pb), used,
477 availblks, 0), sfsp->f_mntonname);
478 /*
479 * another concession by the structured programming police to
480 * the indentation police....
481 *
482 * Note iflag cannot be set when Pflag is set.
483 */
484 return;
485 }
486
487 (void)printf("%-*.*s ", maxwidth, maxwidth, sfsp->f_mntfromname);
488
489 if (hflag)
490 prthuman(sfsp, used, bavail);
491 else
492 (void)printf("%10" PRId64 " %10" PRId64 " %10" PRId64,
493 fsbtoblk(sfsp->f_blocks, sfsp->f_frsize, blocksize),
494 fsbtoblk(used, sfsp->f_frsize, blocksize),
495 fsbtoblk(bavail, sfsp->f_frsize, blocksize));
496 (void)printf(" %3s%%",
497 availblks == 0 ? full :
498 strspct(pb, sizeof(pb), used, availblks, 0));
499 if (iflag) {
500 inodes = sfsp->f_files;
501 used = inodes - sfsp->f_ffree;
502 (void)printf(" %8jd %8jd %4s%%",
503 (intmax_t)used, (intmax_t)sfsp->f_ffree,
504 inodes == 0 ? (used == 0 ? empty : full) :
505 strspct(pb, sizeof(pb), used, inodes, 0));
506 }
507 (void)printf(" %s\n", sfsp->f_mntonname);
508}
509
510static void
511usage(void)
512{
513
514 (void)fprintf(stderr,
515 "Usage: %s [-agln] [-Ghkm|-ihkm|-Pk] [-t type] [file | "
516 "file_system ...]\n",
517 getprogname());
518 exit(1);
519 /* NOTREACHED */
520}
521