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 * 3. 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 * @(#) Copyright (c) 1980, 1990, 1993, 1994 The Regents of the University of California. All rights reserved.
35 * @(#)df.c 8.9 (Berkeley) 5/8/95
36 * $FreeBSD: src/bin/df/df.c,v 1.23.2.9 2002/07/01 00:14:24 iedowse Exp $
37 */
38
39 #include <sys/param.h>
40 #include <sys/stat.h>
41 #include <sys/mount.h>
42 #include <sys/sysctl.h>
43 #include <sys/statvfs.h>
44
45 #include <vfs/ufs/dinode.h>
46 #include <vfs/ufs/ufsmount.h>
47
48 #include <err.h>
49 #include <errno.h>
50 #include <fcntl.h>
51 #include <fstab.h>
52 #include <libutil.h>
53 #include <stdio.h>
54 #include <stdlib.h>
55 #include <string.h>
56 #include <sysexits.h>
57 #include <unistd.h>
58
59 #define UNITS_SI 1
60 #define UNITS_2 2
61
62 #ifndef HN_FRACTIONAL
63 #define HN_FRACTIONAL HN_DECIMAL
64 #endif
65
66 /* Maximum widths of various fields. */
67 struct maxwidths {
68 int mntfrom;
69 int fstype;
70 int total;
71 int used;
72 int avail;
73 int iused;
74 int ifree;
75 };
76
77 /* vfslist.c */
78 char **makevfslist(char *);
79 int checkvfsname(const char *, char **);
80
81 static char *getmntpt(char *);
82 static int quadwidth(int64_t);
83 static char *makenetvfslist(void);
84 static void prthuman(struct statvfs *, int64_t);
85 static void prthumanval(int64_t);
86 static void prtstat(struct statfs *, struct statvfs *, struct maxwidths *);
87 static long regetmntinfo(struct statfs **, struct statvfs **, long, char **);
88 static void update_maxwidths(struct maxwidths *, struct statfs *, struct statvfs *);
89 static void usage(void);
90
91 static int aflag = 0, hflag, iflag, nflag, Tflag;
92 static struct ufs_args mdev;
93
94 static __inline int
imax(int a,int b)95 imax(int a, int b)
96 {
97 return (a > b ? a : b);
98 }
99
100 int
main(int argc,char ** argv)101 main(int argc, char **argv)
102 {
103 struct stat stbuf;
104 struct statfs statfsbuf, *mntbuf;
105 struct statvfs statvfsbuf, *mntvbuf;
106 struct maxwidths maxwidths;
107 const char *fstype;
108 char *mntpath, *mntpt, **vfslist;
109 long mntsize;
110 int ch, i, rv;
111
112 fstype = "ufs";
113
114 vfslist = NULL;
115 while ((ch = getopt(argc, argv, "abgHhiklmnPt:T")) != -1)
116 switch (ch) {
117 case 'a':
118 aflag = 1;
119 break;
120 case 'b':
121 /* FALLTHROUGH */
122 case 'P':
123 if (setenv("BLOCKSIZE", "512", 1) != 0)
124 warn("setenv: cannot set BLOCKSIZE=512");
125 hflag = 0;
126 break;
127 case 'g':
128 if (setenv("BLOCKSIZE", "1g", 1) != 0)
129 warn("setenv: cannot set BLOCKSIZE=1g");
130 hflag = 0;
131 break;
132 case 'H':
133 hflag = UNITS_SI;
134 break;
135 case 'h':
136 hflag = UNITS_2;
137 break;
138 case 'i':
139 iflag = 1;
140 break;
141 case 'k':
142 if (setenv("BLOCKSIZE", "1k", 1) != 0)
143 warn("setenv: cannot set BLOCKSIZE=1k");
144 hflag = 0;
145 break;
146 case 'l':
147 if (vfslist != NULL)
148 errx(1, "-l and -t are mutually exclusive.");
149 vfslist = makevfslist(makenetvfslist());
150 break;
151 case 'm':
152 if (setenv("BLOCKSIZE", "1m", 1) != 0)
153 warn("setenv: cannot set BLOCKSIZE=1m");
154 hflag = 0;
155 break;
156 case 'n':
157 nflag = 1;
158 break;
159 case 't':
160 if (vfslist != NULL)
161 errx(1, "only one -t option may be specified");
162 fstype = optarg;
163 vfslist = makevfslist(optarg);
164 break;
165 case 'T':
166 Tflag = 1;
167 break;
168 case '?':
169 default:
170 usage();
171 }
172 argc -= optind;
173 argv += optind;
174
175 mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT);
176 bzero(&maxwidths, sizeof(maxwidths));
177 for (i = 0; i < mntsize; i++)
178 update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]);
179
180 rv = 0;
181 if (!*argv) {
182 mntsize = regetmntinfo(&mntbuf, &mntvbuf, mntsize, vfslist);
183 bzero(&maxwidths, sizeof(maxwidths));
184 for (i = 0; i < mntsize; i++)
185 update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]);
186 for (i = 0; i < mntsize; i++) {
187 if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0)
188 prtstat(&mntbuf[i], &mntvbuf[i], &maxwidths);
189 }
190 exit(rv);
191 }
192
193 for (; *argv; argv++) {
194 if (stat(*argv, &stbuf) < 0) {
195 if ((mntpt = getmntpt(*argv)) == NULL) {
196 warn("%s", *argv);
197 rv = 1;
198 continue;
199 }
200 } else if (S_ISCHR(stbuf.st_mode)) {
201 if ((mntpt = getmntpt(*argv)) == NULL) {
202 mdev.fspec = *argv;
203 mntpath = strdup("/tmp/df.XXXXXX");
204 if (mntpath == NULL) {
205 warn("strdup failed");
206 rv = 1;
207 continue;
208 }
209 mntpt = mkdtemp(mntpath);
210 if (mntpt == NULL) {
211 warn("mkdtemp(\"%s\") failed", mntpath);
212 rv = 1;
213 free(mntpath);
214 continue;
215 }
216 if (mount(fstype, mntpt, MNT_RDONLY,
217 &mdev) != 0) {
218 warn("%s", *argv);
219 rv = 1;
220 rmdir(mntpt);
221 free(mntpath);
222 continue;
223 } else if (statfs(mntpt, &statfsbuf) == 0 &&
224 statvfs(mntpt, &statvfsbuf) == 0) {
225 statfsbuf.f_mntonname[0] = '\0';
226 prtstat(&statfsbuf, &statvfsbuf, &maxwidths);
227 } else {
228 warn("%s", *argv);
229 rv = 1;
230 }
231 unmount(mntpt, 0);
232 rmdir(mntpt);
233 free(mntpath);
234 continue;
235 }
236 } else
237 mntpt = *argv;
238 /*
239 * Statfs does not take a `wait' flag, so we cannot
240 * implement nflag here.
241 */
242 if (statfs(mntpt, &statfsbuf) < 0) {
243 warn("%s", mntpt);
244 rv = 1;
245 continue;
246 }
247 if (statvfs(mntpt, &statvfsbuf) < 0) {
248 warn("%s", mntpt);
249 rv = 1;
250 continue;
251 }
252 /*
253 * Check to make sure the arguments we've been given are
254 * satisfied. Return an error if we have been asked to
255 * list a mount point that does not match the other args
256 * we've been given (-l, -t, etc.).
257 */
258 if (checkvfsname(statfsbuf.f_fstypename, vfslist)) {
259 rv = 1;
260 continue;
261 }
262
263 if (argc == 1) {
264 bzero(&maxwidths, sizeof(maxwidths));
265 update_maxwidths(&maxwidths, &statfsbuf, &statvfsbuf);
266 }
267 prtstat(&statfsbuf, &statvfsbuf, &maxwidths);
268 }
269 return (rv);
270 }
271
272 static char *
getmntpt(char * name)273 getmntpt(char *name)
274 {
275 long mntsize, i;
276 struct statfs *mntbuf;
277 struct statvfs *mntvbuf;
278
279 mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT);
280 for (i = 0; i < mntsize; i++) {
281 if (!strcmp(mntbuf[i].f_mntfromname, name))
282 return (mntbuf[i].f_mntonname);
283 }
284 return (0);
285 }
286
287 /*
288 * Make a pass over the filesystem info in ``mntbuf'' filtering out
289 * filesystem types not in vfslist and possibly re-stating to get
290 * current (not cached) info. Returns the new count of valid statfs bufs.
291 */
292 static long
regetmntinfo(struct statfs ** mntbufp,struct statvfs ** mntvbufp,long mntsize,char ** vfslist)293 regetmntinfo(struct statfs **mntbufp, struct statvfs **mntvbufp, long mntsize, char **vfslist)
294 {
295 int i, j;
296 struct statfs *mntbuf;
297 struct statvfs *mntvbuf;
298
299 if (vfslist == NULL)
300 return (nflag ? mntsize : getmntvinfo(mntbufp, mntvbufp, MNT_WAIT));
301
302 mntbuf = *mntbufp;
303 mntvbuf = *mntvbufp;
304 for (j = 0, i = 0; i < mntsize; i++) {
305 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
306 continue;
307 if (!nflag) {
308 statfs(mntbuf[i].f_mntonname,&mntbuf[j]);
309 statvfs(mntbuf[i].f_mntonname,&mntvbuf[j]);
310 } else if (i != j) {
311 mntbuf[j] = mntbuf[i];
312 mntvbuf[j] = mntvbuf[i];
313 }
314 j++;
315 }
316 return (j);
317 }
318
319 static void
prthuman(struct statvfs * vsfsp,int64_t used)320 prthuman(struct statvfs *vsfsp, int64_t used)
321 {
322 prthumanval(vsfsp->f_blocks * vsfsp->f_bsize);
323 prthumanval(used * vsfsp->f_bsize);
324 prthumanval(vsfsp->f_bavail * vsfsp->f_bsize);
325 }
326
327 static void
prthumanval(int64_t bytes)328 prthumanval(int64_t bytes)
329 {
330 char buf[7];
331 int flags;
332
333 flags = HN_B | HN_NOSPACE | HN_FRACTIONAL;
334 if (hflag == UNITS_SI)
335 flags |= HN_DIVISOR_1000;
336
337 humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
338 bytes, "", HN_AUTOSCALE, flags);
339
340 printf(" %6s", buf);
341 }
342
343 /*
344 * Print an inode count in "human-readable" format.
345 */
346 static void
prthumanvalinode(int64_t bytes)347 prthumanvalinode(int64_t bytes)
348 {
349 char buf[6];
350 int flags;
351
352 flags = HN_NOSPACE | HN_FRACTIONAL | HN_DIVISOR_1000;
353
354 humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
355 bytes, "", HN_AUTOSCALE, flags);
356
357 printf(" %5s", buf);
358 }
359
360 /*
361 * Convert statfs returned filesystem size into BLOCKSIZE units.
362 * Attempts to avoid overflow for large filesystems.
363 */
364 static intmax_t
fsbtoblk(int64_t num,uint64_t bsize,u_long reqbsize)365 fsbtoblk(int64_t num, uint64_t bsize, u_long reqbsize)
366 {
367 if (bsize != 0 && bsize < reqbsize)
368 return (num / (intmax_t)(reqbsize / bsize));
369 else
370 return (num * (intmax_t)(bsize / reqbsize));
371 }
372
373 /*
374 * Print out status about a filesystem.
375 */
376 static void
prtstat(struct statfs * sfsp,struct statvfs * vsfsp,struct maxwidths * mwp)377 prtstat(struct statfs *sfsp, struct statvfs *vsfsp, struct maxwidths *mwp)
378 {
379 static long blocksize;
380 static int headerlen, timesthrough;
381 static const char *header;
382 int64_t used, availblks, inodes;
383
384 if (++timesthrough == 1) {
385 mwp->mntfrom = imax(mwp->mntfrom, strlen("Filesystem"));
386 mwp->fstype = imax(mwp->fstype, strlen("Type"));
387 if (hflag) {
388 header = " Size";
389 mwp->total = mwp->used = mwp->avail = strlen(header);
390 } else {
391 header = getbsize(&headerlen, &blocksize);
392 mwp->total = imax(mwp->total, headerlen);
393 }
394 mwp->used = imax(mwp->used, strlen("Used"));
395 mwp->avail = imax(mwp->avail, strlen("Avail"));
396
397 printf("%-*s", mwp->mntfrom, "Filesystem");
398 if (Tflag)
399 printf(" %-*s", mwp->fstype, "Type");
400 printf(" %-*s %*s %*s Capacity", mwp->total, header, mwp->used,
401 "Used", mwp->avail, "Avail");
402 if (iflag) {
403 mwp->iused = imax(hflag ? 0 : mwp->iused,
404 (int)strlen(" iused"));
405 mwp->ifree = imax(hflag ? 0 : mwp->ifree,
406 (int)strlen("ifree"));
407 printf(" %*s %*s %%iused", mwp->iused - 2,
408 "iused", mwp->ifree, "ifree");
409 }
410 printf(" Mounted on\n");
411 }
412 printf("%-*s", mwp->mntfrom, sfsp->f_mntfromname);
413 if (Tflag)
414 printf(" %-*s", mwp->fstype, sfsp->f_fstypename);
415 used = vsfsp->f_blocks - vsfsp->f_bfree;
416 availblks = vsfsp->f_bavail + used;
417 if (hflag) {
418 prthuman(vsfsp, used);
419 } else {
420 printf(" %*jd %*jd %*jd", mwp->total,
421 fsbtoblk(vsfsp->f_blocks, vsfsp->f_bsize, blocksize),
422 mwp->used, fsbtoblk(used, vsfsp->f_bsize, blocksize),
423 mwp->avail, fsbtoblk(vsfsp->f_bavail, vsfsp->f_bsize,
424 blocksize));
425 }
426 printf(" %5.0f%%",
427 availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
428 if (iflag) {
429 inodes = vsfsp->f_files;
430 used = inodes - vsfsp->f_ffree;
431 if (hflag) {
432 printf(" ");
433 prthumanvalinode(used);
434 prthumanvalinode(vsfsp->f_ffree);
435 } else {
436 printf(" %*jd %*jd", mwp->iused, (intmax_t)used,
437 mwp->ifree, (intmax_t)vsfsp->f_ffree);
438 }
439 printf(" %4.0f%% ", inodes == 0 ? 100.0 :
440 (double)used / (double)inodes * 100.0);
441 } else
442 printf(" ");
443 printf(" %s\n", sfsp->f_mntonname);
444 }
445
446 /*
447 * Update the maximum field-width information in `mwp' based on
448 * the filesystem specified by `sfsp'.
449 */
450 static void
update_maxwidths(struct maxwidths * mwp,struct statfs * sfsp,struct statvfs * vsfsp)451 update_maxwidths(struct maxwidths *mwp, struct statfs *sfsp, struct statvfs *vsfsp)
452 {
453 static long blocksize;
454 int dummy;
455
456 if (blocksize == 0)
457 getbsize(&dummy, &blocksize);
458
459 mwp->mntfrom = imax(mwp->mntfrom, strlen(sfsp->f_mntfromname));
460 mwp->fstype = imax(mwp->fstype, strlen(sfsp->f_fstypename));
461 mwp->total = imax(mwp->total, quadwidth(fsbtoblk(vsfsp->f_blocks,
462 vsfsp->f_bsize, blocksize)));
463 mwp->used = imax(mwp->used, quadwidth(fsbtoblk(vsfsp->f_blocks -
464 vsfsp->f_bfree, vsfsp->f_bsize, blocksize)));
465 mwp->avail = imax(mwp->avail, quadwidth(fsbtoblk(vsfsp->f_bavail,
466 vsfsp->f_bsize, blocksize)));
467 mwp->iused = imax(mwp->iused, quadwidth(vsfsp->f_files -
468 vsfsp->f_ffree));
469 mwp->ifree = imax(mwp->ifree, quadwidth(vsfsp->f_ffree));
470 }
471
472 /* Return the width in characters of the specified long. */
473 static int
quadwidth(int64_t val)474 quadwidth(int64_t val)
475 {
476 int len;
477
478 len = 0;
479 /* Negative or zero values require one extra digit. */
480 if (val <= 0) {
481 val = -val;
482 len++;
483 }
484 while (val > 0) {
485 len++;
486 val /= 10;
487 }
488 return (len);
489 }
490
491 static void
usage(void)492 usage(void)
493 {
494
495 fprintf(stderr,
496 "usage: df [-b | -H | -h | -k | -m | -P] [-ailnT] [-t type] [file | filesystem ...]\n");
497 exit(EX_USAGE);
498 }
499
500 static char *
makenetvfslist(void)501 makenetvfslist(void)
502 {
503 char *str, *strptr, **listptr;
504 int mib[3], maxvfsconf, cnt=0, i;
505 size_t miblen;
506 struct ovfsconf *ptr;
507
508 mib[0] = CTL_VFS; mib[1] = VFS_GENERIC; mib[2] = VFS_MAXTYPENUM;
509 miblen=sizeof(maxvfsconf);
510 if (sysctl(mib, (unsigned int)(NELEM(mib)),
511 &maxvfsconf, &miblen, NULL, 0)) {
512 warnx("sysctl failed");
513 return (NULL);
514 }
515
516 if ((listptr = malloc(sizeof(char*) * maxvfsconf)) == NULL) {
517 warnx("malloc failed");
518 return (NULL);
519 }
520
521 for (ptr = getvfsent(); ptr; ptr = getvfsent())
522 if (ptr->vfc_flags & VFCF_NETWORK) {
523 listptr[cnt++] = strdup(ptr->vfc_name);
524 if (listptr[cnt-1] == NULL) {
525 warnx("malloc failed");
526 free(listptr);
527 return (NULL);
528 }
529 }
530
531 if (cnt == 0 ||
532 (str = malloc(sizeof(char) * (32 * cnt + cnt + 2))) == NULL) {
533 if (cnt > 0)
534 warnx("malloc failed");
535 free(listptr);
536 return (NULL);
537 }
538
539 *str = 'n'; *(str + 1) = 'o';
540 for (i = 0, strptr = str + 2; i < cnt; i++, strptr++) {
541 strncpy(strptr, listptr[i], 32);
542 strptr += strlen(listptr[i]);
543 *strptr = ',';
544 free(listptr[i]);
545 }
546 *(--strptr) = '\0';
547
548 free(listptr);
549 return (str);
550 }
551