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df.c revision 1.59 
      1 /*	$NetBSD: df.c,v 1.59 2004/03/26 20:07:47 enami 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\n\
     41 	The Regents of the University of California.  All rights reserved.\n");
     42 #endif /* not lint */
     43 
     44 #ifndef lint
     45 #if 0
     46 static char sccsid[] = "@(#)df.c	8.7 (Berkeley) 4/2/94";
     47 #else
     48 __RCSID("$NetBSD: df.c,v 1.59 2004/03/26 20:07:47 enami 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 <err.h>
     57 #include <errno.h>
     58 #include <fcntl.h>
     59 #include <util.h>
     60 #include <stdio.h>
     61 #include <stdlib.h>
     62 #include <string.h>
     63 #include <unistd.h>
     64 
     65 extern char *strpct(u_long, u_long, u_int);
     66 
     67 int	 main(int, char *[]);
     68 int	 bread(off_t, void *, int);
     69 char	*getmntpt(char *);
     70 void	 prtstat(struct statfs *, int);
     71 int	 selected(const char *);
     72 void	 maketypelist(char *);
     73 long	 regetmntinfo(struct statfs **, long);
     74 void	 usage(void);
     75 void	 prthumanval(int64_t, char *);
     76 void	 prthuman(struct statfs *, long);
     77 
     78 int	aflag, gflag, hflag, iflag, kflag, lflag, mflag, nflag, Pflag;
     79 char	**typelist = NULL;
     80 
     81 int
     82 main(int argc, char *argv[])
     83 {
     84 	struct stat stbuf;
     85 	struct statfs *mntbuf;
     86 	long mntsize;
     87 	int ch, i, maxwidth, width;
     88 	char *mntpt;
     89 
     90 	while ((ch = getopt(argc, argv, "aghiklmnPt:")) != -1)
     91 		switch (ch) {
     92 		case 'a':
     93 			aflag = 1;
     94 			break;
     95 		case 'g':
     96 			gflag = 1;
     97 			break;
     98 		case 'h':
     99 			hflag = 1;
    100 			break;
    101 		case 'i':
    102 			iflag = 1;
    103 			break;
    104 		case 'k':
    105 			kflag = 1;
    106 			break;
    107 		case 'l':
    108 			lflag = 1;
    109 			break;
    110 		case 'm':
    111 			mflag = 1;
    112 			break;
    113 		case 'n':
    114 			nflag = 1;
    115 			break;
    116 		case 'P':
    117 			Pflag = 1;
    118 			break;
    119 		case 't':
    120 			if (typelist != NULL)
    121 				errx(1, "only one -t option may be specified.");
    122 			maketypelist(optarg);
    123 			break;
    124 		case '?':
    125 		default:
    126 			usage();
    127 		}
    128 	argc -= optind;
    129 	argv += optind;
    130 
    131 	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
    132 	if (mntsize == 0)
    133 		err(1, "retrieving information on mounted file systems");
    134 
    135 	if (*argv == NULL) {
    136 		mntsize = regetmntinfo(&mntbuf, mntsize);
    137 	} else {
    138 		mntbuf = malloc(argc * sizeof(struct statfs));
    139 		mntsize = 0;
    140 		for (; *argv != NULL; argv++) {
    141 			if (stat(*argv, &stbuf) < 0) {
    142 				if ((mntpt = getmntpt(*argv)) == 0) {
    143 					warn("%s", *argv);
    144 					continue;
    145 				}
    146 			} else if (S_ISBLK(stbuf.st_mode)) {
    147 				if ((mntpt = getmntpt(*argv)) == 0)
    148 					mntpt = *argv;
    149 			} else
    150 				mntpt = *argv;
    151 			/*
    152 			 * Statfs does not take a `wait' flag, so we cannot
    153 			 * implement nflag here.
    154 			 */
    155 			if (!statfs(mntpt, &mntbuf[mntsize]))
    156 				if (lflag &&
    157 				    (mntbuf[mntsize].f_flags & MNT_LOCAL) == 0)
    158 					warnx("Warning: %s is not a local %s",
    159 					    *argv, "file system");
    160 				else if
    161 				    (!selected(mntbuf[mntsize].f_fstypename))
    162 					warnx("Warning: %s mounted as a %s %s",
    163 					    *argv,
    164 					    mntbuf[mntsize].f_fstypename,
    165 					    "file system");
    166 				else
    167 					++mntsize;
    168 			else
    169 				warn("%s", *argv);
    170 		}
    171 	}
    172 
    173 	maxwidth = 0;
    174 	for (i = 0; i < mntsize; i++) {
    175 		width = strlen(mntbuf[i].f_mntfromname);
    176 		if (width > maxwidth)
    177 			maxwidth = width;
    178 	}
    179 	for (i = 0; i < mntsize; i++)
    180 		prtstat(&mntbuf[i], maxwidth);
    181 	exit(0);
    182 	/* NOTREACHED */
    183 }
    184 
    185 char *
    186 getmntpt(char *name)
    187 {
    188 	long mntsize, i;
    189 	struct statfs *mntbuf;
    190 
    191 	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
    192 	for (i = 0; i < mntsize; i++) {
    193 		if (!strcmp(mntbuf[i].f_mntfromname, name))
    194 			return (mntbuf[i].f_mntonname);
    195 	}
    196 	return (0);
    197 }
    198 
    199 static enum { IN_LIST, NOT_IN_LIST } which;
    200 
    201 int
    202 selected(const char *type)
    203 {
    204 	char **av;
    205 
    206 	/* If no type specified, it's always selected. */
    207 	if (typelist == NULL)
    208 		return (1);
    209 	for (av = typelist; *av != NULL; ++av)
    210 		if (!strncmp(type, *av, MFSNAMELEN))
    211 			return (which == IN_LIST ? 1 : 0);
    212 	return (which == IN_LIST ? 0 : 1);
    213 }
    214 
    215 void
    216 maketypelist(char *fslist)
    217 {
    218 	int i;
    219 	char *nextcp, **av;
    220 
    221 	if ((fslist == NULL) || (fslist[0] == '\0'))
    222 		errx(1, "empty type list");
    223 
    224 	/*
    225 	 * XXX
    226 	 * Note: the syntax is "noxxx,yyy" for no xxx's and
    227 	 * no yyy's, not the more intuitive "noyyy,noyyy".
    228 	 */
    229 	if (fslist[0] == 'n' && fslist[1] == 'o') {
    230 		fslist += 2;
    231 		which = NOT_IN_LIST;
    232 	} else
    233 		which = IN_LIST;
    234 
    235 	/* Count the number of types. */
    236 	for (i = 1, nextcp = fslist;
    237 	    (nextcp = strchr(nextcp, ',')) != NULL; i++)
    238 		++nextcp;
    239 
    240 	/* Build an array of that many types. */
    241 	if ((av = typelist = malloc((i + 1) * sizeof(char *))) == NULL)
    242 		err(1, "can't allocate type array");
    243 	av[0] = fslist;
    244 	for (i = 1, nextcp = fslist;
    245 	    (nextcp = strchr(nextcp, ',')) != NULL; i++) {
    246 		*nextcp = '\0';
    247 		av[i] = ++nextcp;
    248 	}
    249 	/* Terminate the array. */
    250 	av[i] = NULL;
    251 }
    252 
    253 /*
    254  * Make a pass over the filesystem info in ``mntbuf'' filtering out
    255  * filesystem types not in ``fsmask'' and possibly re-stating to get
    256  * current (not cached) info.  Returns the new count of valid statfs bufs.
    257  */
    258 long
    259 regetmntinfo(struct statfs **mntbufp, long mntsize)
    260 {
    261 	int i, j;
    262 	struct statfs *mntbuf;
    263 
    264 	if (!lflag && typelist == NULL && aflag)
    265 		return (nflag ? mntsize : getmntinfo(mntbufp, MNT_WAIT));
    266 
    267 	mntbuf = *mntbufp;
    268 	j = 0;
    269 	for (i = 0; i < mntsize; i++) {
    270 		if (!aflag && (mntbuf[i].f_flags & MNT_IGNORE) != 0)
    271 			continue;
    272 		if (lflag && (mntbuf[i].f_flags & MNT_LOCAL) == 0)
    273 			continue;
    274 		if (!selected(mntbuf[i].f_fstypename))
    275 			continue;
    276 		if (nflag)
    277 			mntbuf[j] = mntbuf[i];
    278 		else {
    279 			struct statfs layerbuf = mntbuf[i];
    280 			(void)statfs(mntbuf[i].f_mntonname, &mntbuf[j]);
    281 			/*
    282 			 * If the FS name changed, then new data is for
    283 			 * a different layer and we don't want it.
    284 			 */
    285 			if (memcmp(layerbuf.f_mntfromname,
    286 			    mntbuf[j].f_mntfromname, MNAMELEN))
    287 				mntbuf[j] = layerbuf;
    288 		}
    289 		j++;
    290 	}
    291 	return (j);
    292 }
    293 
    294 void
    295 prthumanval(int64_t bytes, char *pad)
    296 {
    297 	char buf[6];
    298 
    299 	humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
    300 	    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 	    (int64_t)(num) / ((bs) / (fsbs)) :			\
    322 	    (int64_t)(num) * ((fsbs) / (bs)))
    323 
    324 /*
    325  * Print out status about a filesystem.
    326  */
    327 void
    328 prtstat(struct statfs *sfsp, int maxwidth)
    329 {
    330 	static long blocksize;
    331 	static int headerlen, timesthrough;
    332 	static char *header;
    333 	static const char full[] = "100%";
    334 	static const char empty[] = "  0%";
    335 	long used, availblks, inodes;
    336 
    337 	if (maxwidth < 11)
    338 		maxwidth = 11;
    339 	if (++timesthrough == 1) {
    340 		if (kflag) {
    341 			blocksize = 1024;
    342 			header = Pflag ? "1024-blocks" : "1K-blocks";
    343 			headerlen = strlen(header);
    344 		} else if (mflag) {
    345 			blocksize = 1024 * 1024;
    346 			header = Pflag ? "1048576-blocks" : "1M-blocks";
    347 			headerlen = strlen(header);
    348 		} else if (gflag) {
    349 			blocksize = 1024 * 1024 * 1024;
    350 			header = Pflag ? "1073741824-blocks" : "1G-blocks";
    351 			headerlen = strlen(header);
    352 		} else if (hflag) {
    353 			header = "  Size";
    354 			headerlen = strlen(header);
    355 		} else
    356 			header = getbsize(&headerlen, &blocksize);
    357 		(void)printf("%-*.*s %s     Used %9s Capacity",
    358 		    maxwidth, maxwidth, "Filesystem", header,
    359 		    Pflag ? "Available" : "Avail");
    360 		if (iflag)
    361 			(void)printf("  iused    ifree  %%iused");
    362 		(void)printf("  Mounted on\n");
    363 	}
    364 	(void)printf("%-*.*s", maxwidth, maxwidth, sfsp->f_mntfromname);
    365 	used = sfsp->f_blocks - sfsp->f_bfree;
    366 	availblks = sfsp->f_bavail + used;
    367 	if (hflag)
    368 		prthuman(sfsp, used);
    369 	else
    370 		(void)printf(" %*" PRId64 " %8" PRId64 " %9" PRId64, headerlen,
    371 		    fsbtoblk(sfsp->f_blocks, sfsp->f_bsize, blocksize),
    372 		    fsbtoblk(used, sfsp->f_bsize, blocksize),
    373 		    fsbtoblk(sfsp->f_bavail, sfsp->f_bsize, blocksize));
    374 	(void)printf("%7s",
    375 	    availblks == 0 ? full : strpct((u_long)used, (u_long)availblks, 0));
    376 	if (iflag) {
    377 		inodes = sfsp->f_files;
    378 		used = inodes - sfsp->f_ffree;
    379 		(void)printf(" %8ld %8ld %6s ", used, sfsp->f_ffree,
    380 		    inodes == 0 ? (used == 0 ? empty : full) :
    381 		    strpct((u_long)used, (u_long)inodes, 0));
    382 	} else
    383 		(void)printf("  ");
    384 	(void)printf("  %s\n", sfsp->f_mntonname);
    385 }
    386 
    387 void
    388 usage(void)
    389 {
    390 
    391 	(void)fprintf(stderr,
    392 	    "usage: %s [-aghiklmnP] [-t type] [file | file_system ...]\n",
    393 	    getprogname());
    394 	exit(1);
    395 	/* NOTREACHED */
    396 }
    397