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df.c revision 1.70 
      1 /*	$NetBSD: df.c,v 1.70 2006/03/17 13:53:31 rumble 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 1.70 2006/03/17 13:53:31 rumble 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 statvfs *, int);
     71 int	 selected(const char *);
     72 void	 maketypelist(char *);
     73 long	 regetmntinfo(struct statvfs **, long);
     74 void	 usage(void);
     75 void	 prthumanval(int64_t, const char *);
     76 void	 prthuman(struct statvfs *, int64_t, int64_t);
     77 const char *
     78 	strpct64(uint64_t, uint64_t, u_int);
     79 
     80 int	aflag, gflag, hflag, iflag, kflag, lflag, mflag, nflag, Pflag;
     81 char	**typelist = NULL;
     82 
     83 int
     84 main(int argc, char *argv[])
     85 {
     86 	struct stat stbuf;
     87 	struct statvfs *mntbuf;
     88 	long mntsize;
     89 	int ch, i, maxwidth, width;
     90 	char *mntpt;
     91 
     92 	while ((ch = getopt(argc, argv, "aghiklmnPt:")) != -1)
     93 		switch (ch) {
     94 		case 'a':
     95 			aflag = 1;
     96 			break;
     97 		case 'g':
     98 			gflag = 1;
     99 			break;
    100 		case 'h':
    101 			hflag = 1;
    102 			break;
    103 		case 'i':
    104 			iflag = 1;
    105 			break;
    106 		case 'k':
    107 			kflag = 1;
    108 			break;
    109 		case 'l':
    110 			lflag = 1;
    111 			break;
    112 		case 'm':
    113 			mflag = 1;
    114 			break;
    115 		case 'n':
    116 			nflag = 1;
    117 			break;
    118 		case 'P':
    119 			Pflag = 1;
    120 			break;
    121 		case 't':
    122 			if (typelist != NULL)
    123 				errx(1, "only one -t option may be specified.");
    124 			maketypelist(optarg);
    125 			break;
    126 		case '?':
    127 		default:
    128 			usage();
    129 		}
    130 	argc -= optind;
    131 	argv += optind;
    132 
    133 	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
    134 	if (mntsize == 0)
    135 		err(1, "retrieving information on mounted file systems");
    136 
    137 	if (*argv == NULL) {
    138 		mntsize = regetmntinfo(&mntbuf, mntsize);
    139 	} else {
    140 		if ((mntbuf = malloc(argc * sizeof(*mntbuf))) == NULL)
    141 			err(1, "can't allocate statvfs array");
    142 		mntsize = 0;
    143 		for (; *argv != NULL; argv++) {
    144 			if (stat(*argv, &stbuf) < 0) {
    145 				if ((mntpt = getmntpt(*argv)) == 0) {
    146 					warn("%s", *argv);
    147 					continue;
    148 				}
    149 			} else if (S_ISBLK(stbuf.st_mode)) {
    150 				if ((mntpt = getmntpt(*argv)) == 0)
    151 					mntpt = *argv;
    152 			} else
    153 				mntpt = *argv;
    154 			/*
    155 			 * Statfs does not take a `wait' flag, so we cannot
    156 			 * implement nflag here.
    157 			 */
    158 			if (!statvfs(mntpt, &mntbuf[mntsize]))
    159 				if (lflag &&
    160 				    (mntbuf[mntsize].f_flag & MNT_LOCAL) == 0)
    161 					warnx("Warning: %s is not a local %s",
    162 					    *argv, "file system");
    163 				else if
    164 				    (!selected(mntbuf[mntsize].f_fstypename))
    165 					warnx("Warning: %s mounted as a %s %s",
    166 					    *argv,
    167 					    mntbuf[mntsize].f_fstypename,
    168 					    "file system");
    169 				else
    170 					++mntsize;
    171 			else
    172 				warn("%s", *argv);
    173 		}
    174 	}
    175 
    176 	maxwidth = 0;
    177 	for (i = 0; i < mntsize; i++) {
    178 		width = strlen(mntbuf[i].f_mntfromname);
    179 		if (width > maxwidth)
    180 			maxwidth = width;
    181 	}
    182 	for (i = 0; i < mntsize; i++)
    183 		prtstat(&mntbuf[i], maxwidth);
    184 	exit(0);
    185 	/* NOTREACHED */
    186 }
    187 
    188 char *
    189 getmntpt(char *name)
    190 {
    191 	long mntsize, i;
    192 	struct statvfs *mntbuf;
    193 
    194 	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
    195 	for (i = 0; i < mntsize; i++) {
    196 		if (!strcmp(mntbuf[i].f_mntfromname, name))
    197 			return (mntbuf[i].f_mntonname);
    198 	}
    199 	return (0);
    200 }
    201 
    202 static enum { IN_LIST, NOT_IN_LIST } which;
    203 
    204 int
    205 selected(const char *type)
    206 {
    207 	char **av;
    208 
    209 	/* If no type specified, it's always selected. */
    210 	if (typelist == NULL)
    211 		return (1);
    212 	for (av = typelist; *av != NULL; ++av)
    213 		if (!strncmp(type, *av, MFSNAMELEN))
    214 			return (which == IN_LIST ? 1 : 0);
    215 	return (which == IN_LIST ? 0 : 1);
    216 }
    217 
    218 void
    219 maketypelist(char *fslist)
    220 {
    221 	int i;
    222 	char *nextcp, **av;
    223 
    224 	if ((fslist == NULL) || (fslist[0] == '\0'))
    225 		errx(1, "empty type list");
    226 
    227 	/*
    228 	 * XXX
    229 	 * Note: the syntax is "noxxx,yyy" for no xxx's and
    230 	 * no yyy's, not the more intuitive "noyyy,noyyy".
    231 	 */
    232 	if (fslist[0] == 'n' && fslist[1] == 'o') {
    233 		fslist += 2;
    234 		which = NOT_IN_LIST;
    235 	} else
    236 		which = IN_LIST;
    237 
    238 	/* Count the number of types. */
    239 	for (i = 1, nextcp = fslist;
    240 	    (nextcp = strchr(nextcp, ',')) != NULL; i++)
    241 		++nextcp;
    242 
    243 	/* Build an array of that many types. */
    244 	if ((av = typelist = malloc((i + 1) * sizeof(char *))) == NULL)
    245 		err(1, "can't allocate type array");
    246 	av[0] = fslist;
    247 	for (i = 1, nextcp = fslist;
    248 	    (nextcp = strchr(nextcp, ',')) != NULL; i++) {
    249 		*nextcp = '\0';
    250 		av[i] = ++nextcp;
    251 	}
    252 	/* Terminate the array. */
    253 	av[i] = NULL;
    254 }
    255 
    256 /*
    257  * Make a pass over the filesystem info in ``mntbuf'' filtering out
    258  * filesystem types not in ``fsmask'' and possibly re-stating to get
    259  * current (not cached) info.  Returns the new count of valid statvfs bufs.
    260  */
    261 long
    262 regetmntinfo(struct statvfs **mntbufp, long mntsize)
    263 {
    264 	int i, j;
    265 	struct statvfs *mntbuf;
    266 
    267 	if (!lflag && typelist == NULL && aflag)
    268 		return (nflag ? mntsize : getmntinfo(mntbufp, MNT_WAIT));
    269 
    270 	mntbuf = *mntbufp;
    271 	j = 0;
    272 	for (i = 0; i < mntsize; i++) {
    273 		if (!aflag && (mntbuf[i].f_flag & MNT_IGNORE) != 0)
    274 			continue;
    275 		if (lflag && (mntbuf[i].f_flag & MNT_LOCAL) == 0)
    276 			continue;
    277 		if (!selected(mntbuf[i].f_fstypename))
    278 			continue;
    279 		if (nflag)
    280 			mntbuf[j] = mntbuf[i];
    281 		else {
    282 			struct statvfs layerbuf = mntbuf[i];
    283 			(void)statvfs(mntbuf[i].f_mntonname, &mntbuf[j]);
    284 			/*
    285 			 * If the FS name changed, then new data is for
    286 			 * a different layer and we don't want it.
    287 			 */
    288 			if (memcmp(layerbuf.f_mntfromname,
    289 			    mntbuf[j].f_mntfromname, MNAMELEN))
    290 				mntbuf[j] = layerbuf;
    291 		}
    292 		j++;
    293 	}
    294 	return (j);
    295 }
    296 
    297 void
    298 prthumanval(int64_t bytes, const char *pad)
    299 {
    300 	char buf[6];
    301 
    302 	humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
    303 	    bytes, "", HN_AUTOSCALE,
    304 	    HN_B | HN_NOSPACE | HN_DECIMAL);
    305 
    306 	(void)printf("%s %6s", pad, buf);
    307 }
    308 
    309 void
    310 prthuman(struct statvfs *sfsp, int64_t used, int64_t bavail)
    311 {
    312 
    313 	prthumanval(sfsp->f_blocks * sfsp->f_frsize, "");
    314 	prthumanval(used * sfsp->f_frsize, "  ");
    315 	prthumanval(bavail * sfsp->f_frsize, "   ");
    316 }
    317 
    318 /*
    319  * Convert statvfs returned filesystem size into BLOCKSIZE units.
    320  * Attempts to avoid overflow for large filesystems.
    321  */
    322 #define fsbtoblk(num, fsbs, bs)					\
    323 	(((fsbs) != 0 && (fsbs) < (bs)) ?			\
    324 	    (int64_t)(num) / (int64_t)((bs) / (fsbs)) :		\
    325 	    (int64_t)(num) * ((fsbs) / (bs)))
    326 
    327 /*
    328  * Print out status about a filesystem.
    329  */
    330 void
    331 prtstat(struct statvfs *sfsp, int maxwidth)
    332 {
    333 	static long blocksize;
    334 	static int headerlen, timesthrough;
    335 	static const char *header;
    336 	static const char full[] = "100%";
    337 	static const char empty[] = "  0%";
    338 	int64_t used, availblks, inodes;
    339 	int64_t bavail;
    340 
    341 	if (maxwidth < 11)
    342 		maxwidth = 11;
    343 	if (++timesthrough == 1) {
    344 		if (kflag && !hflag) {
    345 			blocksize = 1024;
    346 			header = Pflag ? "1024-blocks" : "1K-blocks";
    347 			headerlen = strlen(header);
    348 		} else if (mflag) {
    349 			blocksize = 1024 * 1024;
    350 			header = Pflag ? "1048576-blocks" : "1M-blocks";
    351 			headerlen = strlen(header);
    352 		} else if (gflag) {
    353 			blocksize = 1024 * 1024 * 1024;
    354 			header = Pflag ? "1073741824-blocks" : "1G-blocks";
    355 			headerlen = strlen(header);
    356 		} else if (hflag) {
    357 			header = "  Size";
    358 			headerlen = strlen(header);
    359 		} else
    360 			header = getbsize(&headerlen, &blocksize);
    361 		(void)printf("%-*.*s %s      Used %9s Capacity",
    362 		    maxwidth, maxwidth, "Filesystem", header,
    363 		    Pflag ? "Available" : "Avail");
    364 		if (iflag)
    365 			(void)printf("  iused    ifree  %%iused");
    366 		(void)printf("  Mounted on\n");
    367 	}
    368 	(void)printf("%-*.*s", maxwidth, maxwidth, sfsp->f_mntfromname);
    369 	used = sfsp->f_blocks - sfsp->f_bfree;
    370 	bavail = sfsp->f_bfree - sfsp->f_bresvd;
    371 	availblks = bavail + used;
    372 	if (hflag)
    373 		prthuman(sfsp, used, bavail);
    374 	else
    375 		(void)printf(" %*" PRId64 " %9" PRId64 " %9" PRId64, headerlen,
    376 		    fsbtoblk(sfsp->f_blocks, sfsp->f_frsize, blocksize),
    377 		    fsbtoblk(used, sfsp->f_frsize, blocksize),
    378 		    fsbtoblk(bavail, sfsp->f_frsize, blocksize));
    379 	(void)printf("%7s",
    380 	    availblks == 0 ? full :
    381 	    /* We know that these values are never negative */
    382 	    strpct64((uint64_t)used, (uint64_t)availblks, 0));
    383 	if (iflag) {
    384 		inodes = sfsp->f_files;
    385 		used = inodes - sfsp->f_ffree;
    386 		(void)printf(" %8ld %8ld %6s ",
    387 		    (u_long)used, (u_long)sfsp->f_ffree,
    388 		    inodes == 0 ? (used == 0 ? empty : full) :
    389 		    strpct64((uint64_t)used, (uint64_t)inodes, 0));
    390 	} else
    391 		(void)printf("  ");
    392 	(void)printf("  %s\n", sfsp->f_mntonname);
    393 }
    394 
    395 void
    396 usage(void)
    397 {
    398 
    399 	(void)fprintf(stderr,
    400 	    "usage: %s [-aghiklmnP] [-t type] [file | file_system ...]\n",
    401 	    getprogname());
    402 	exit(1);
    403 	/* NOTREACHED */
    404 }
    405 
    406 const char *
    407 strpct64(uint64_t numerator, uint64_t denominator, u_int digits)
    408 {
    409 
    410 	while (denominator > ULONG_MAX) {
    411 		numerator >>= 1;
    412 		denominator >>= 1;
    413 	}
    414 	return (strpct((u_long)numerator, (u_long)denominator, digits));
    415 }
    416