OpenBSD-4.6/bin/df/df.c
/* $OpenBSD: df.c,v 1.49 2008/03/16 20:04:35 otto Exp $ */
/* $NetBSD: df.c,v 1.21.2.1 1995/11/01 00:06:11 jtc Exp $ */
/*
* Copyright (c) 1980, 1990, 1993, 1994
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1980, 1990, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)df.c 8.7 (Berkeley) 4/2/94";
#else
static char rcsid[] = "$OpenBSD: df.c,v 1.49 2008/03/16 20:04:35 otto Exp $";
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
extern char *__progname;
char *getmntpt(char *);
int selected(const char *);
void maketypelist(char *);
long regetmntinfo(struct statfs **, long);
void bsdprint(struct statfs *, long, int);
void prtstat(struct statfs *, int, int, int);
void posixprint(struct statfs *, long, int);
int bread(int, off_t, void *, int);
void usage(void);
void prthumanval(long long);
void prthuman(struct statfs *sfsp, unsigned long long);
int raw_df(char *, struct statfs *);
extern int ffs_df(int, char *, struct statfs *);
extern int e2fs_df(int, char *, struct statfs *);
int hflag, iflag, kflag, lflag, nflag, Pflag;
char **typelist = NULL;
int
main(int argc, char *argv[])
{
struct stat stbuf;
struct statfs *mntbuf;
long mntsize;
int ch, i;
int width, maxwidth;
char *mntpt;
while ((ch = getopt(argc, argv, "hiklnPt:")) != -1)
switch (ch) {
case 'h':
hflag = 1;
kflag = 0;
break;
case 'i':
iflag = 1;
break;
case 'k':
kflag = 1;
hflag = 0;
break;
case 'l':
lflag = 1;
break;
case 'n':
nflag = 1;
break;
case 'P':
Pflag = 1;
break;
case 't':
if (typelist != NULL)
errx(1, "only one -t option may be specified.");
maketypelist(optarg);
break;
default:
usage();
}
argc -= optind;
argv += optind;
if ((iflag || hflag) && Pflag) {
warnx("-h and -i are incompatible with -P");
usage();
}
mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
if (mntsize == 0)
err(1, "retrieving information on mounted file systems");
if (!*argv) {
mntsize = regetmntinfo(&mntbuf, mntsize);
} else {
mntbuf = calloc(argc, sizeof(struct statfs));
if (mntbuf == NULL)
err(1, NULL);
mntsize = 0;
for (; *argv; argv++) {
if (stat(*argv, &stbuf) < 0) {
if ((mntpt = getmntpt(*argv)) == 0) {
warn("%s", *argv);
continue;
}
} else if (S_ISCHR(stbuf.st_mode) || S_ISBLK(stbuf.st_mode)) {
if (!raw_df(*argv, &mntbuf[mntsize]))
++mntsize;
continue;
} else
mntpt = *argv;
/*
* Statfs does not take a `wait' flag, so we cannot
* implement nflag here.
*/
if (!statfs(mntpt, &mntbuf[mntsize]))
if (lflag && (mntbuf[mntsize].f_flags & MNT_LOCAL) == 0)
warnx("%s is not a local file system",
*argv);
else if (!selected(mntbuf[mntsize].f_fstypename))
warnx("%s mounted as a %s file system",
*argv, mntbuf[mntsize].f_fstypename);
else
++mntsize;
else
warn("%s", *argv);
}
}
if (mntsize) {
maxwidth = 0;
for (i = 0; i < mntsize; i++) {
width = strlen(mntbuf[i].f_mntfromname);
if (width > maxwidth)
maxwidth = width;
}
if (maxwidth < 11)
maxwidth = 11;
if (Pflag)
posixprint(mntbuf, mntsize, maxwidth);
else
bsdprint(mntbuf, mntsize, maxwidth);
}
exit(mntsize ? 0 : 1);
}
char *
getmntpt(char *name)
{
long mntsize, i;
struct statfs *mntbuf;
mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
for (i = 0; i < mntsize; i++) {
if (!strcmp(mntbuf[i].f_mntfromname, name))
return (mntbuf[i].f_mntonname);
}
return (0);
}
static enum { IN_LIST, NOT_IN_LIST } which;
int
selected(const char *type)
{
char **av;
/* If no type specified, it's always selected. */
if (typelist == NULL)
return (1);
for (av = typelist; *av != NULL; ++av)
if (!strncmp(type, *av, MFSNAMELEN))
return (which == IN_LIST ? 1 : 0);
return (which == IN_LIST ? 0 : 1);
}
void
maketypelist(char *fslist)
{
int i;
char *nextcp, **av;
if ((fslist == NULL) || (fslist[0] == '\0'))
errx(1, "empty type list");
/*
* XXX
* Note: the syntax is "noxxx,yyy" for no xxx's and
* no yyy's, not the more intuitive "noyyy,noyyy".
*/
if (fslist[0] == 'n' && fslist[1] == 'o') {
fslist += 2;
which = NOT_IN_LIST;
} else
which = IN_LIST;
/* Count the number of types. */
for (i = 1, nextcp = fslist; (nextcp = strchr(nextcp, ',')) != NULL; i++)
++nextcp;
/* Build an array of that many types. */
if ((av = typelist = calloc(i + 1, sizeof(char *))) == NULL)
err(1, NULL);
av[0] = fslist;
for (i = 1, nextcp = fslist; (nextcp = strchr(nextcp, ',')) != NULL; i++) {
*nextcp = '\0';
av[i] = ++nextcp;
}
/* Terminate the array. */
av[i] = NULL;
}
/*
* Make a pass over the filesystem info in ``mntbuf'' filtering out
* filesystem types not in ``fsmask'' and possibly re-stating to get
* current (not cached) info. Returns the new count of valid statfs bufs.
*/
long
regetmntinfo(struct statfs **mntbufp, long mntsize)
{
int i, j;
struct statfs *mntbuf;
if (!lflag && typelist == NULL)
return (nflag ? mntsize : getmntinfo(mntbufp, MNT_WAIT));
mntbuf = *mntbufp;
j = 0;
for (i = 0; i < mntsize; i++) {
if (lflag && (mntbuf[i].f_flags & MNT_LOCAL) == 0)
continue;
if (!selected(mntbuf[i].f_fstypename))
continue;
if (nflag)
mntbuf[j] = mntbuf[i];
else
(void)statfs(mntbuf[i].f_mntonname, &mntbuf[j]);
j++;
}
return (j);
}
/*
* "human-readable" output: use 3 digits max.--put unit suffixes at
* the end. Makes output compact and easy-to-read esp. on huge disks.
* Code moved into libutil; this is now just a wrapper.
*/
void
prthumanval(long long bytes)
{
char ret[FMT_SCALED_STRSIZE];
if (fmt_scaled(bytes, ret) == -1) {
(void)printf(" %lld", bytes);
return;
}
(void)printf(" %7s", ret);
}
void
prthuman(struct statfs *sfsp, unsigned long long used)
{
prthumanval(sfsp->f_blocks * sfsp->f_bsize);
prthumanval(used * sfsp->f_bsize);
prthumanval(sfsp->f_bavail * sfsp->f_bsize);
}
/*
* Convert statfs returned filesystem size into BLOCKSIZE units.
* Attempts to avoid overflow for large filesystems.
*/
#define fsbtoblk(num, fsbs, bs) \
(((fsbs) != 0 && (fsbs) < (bs)) ? \
(num) / ((bs) / (fsbs)) : (num) * ((fsbs) / (bs)))
/*
* Print out status about a filesystem.
*/
void
prtstat(struct statfs *sfsp, int maxwidth, int headerlen, int blocksize)
{
u_int64_t used, inodes;
int64_t availblks;
(void)printf("%-*.*s", maxwidth, maxwidth, sfsp->f_mntfromname);
used = sfsp->f_blocks - sfsp->f_bfree;
availblks = sfsp->f_bavail + used;
if (hflag)
prthuman(sfsp, used);
else
(void)printf(" %*llu %9llu %9lld", headerlen,
fsbtoblk(sfsp->f_blocks, sfsp->f_bsize, blocksize),
fsbtoblk(used, sfsp->f_bsize, blocksize),
fsbtoblk(sfsp->f_bavail, sfsp->f_bsize, blocksize));
(void)printf(" %5.0f%%",
availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
if (iflag) {
inodes = sfsp->f_files;
used = inodes - sfsp->f_ffree;
(void)printf(" %7llu %7llu %5.0f%% ", used, sfsp->f_ffree,
inodes == 0 ? 100.0 : (double)used / (double)inodes * 100.0);
} else
(void)printf(" ");
(void)printf(" %s\n", sfsp->f_mntonname);
}
/*
* Print in traditional BSD format.
*/
void
bsdprint(struct statfs *mntbuf, long mntsize, int maxwidth)
{
int i;
char *header;
int headerlen;
long blocksize;
/* Print the header line */
if (hflag) {
header = " Size";
headerlen = strlen(header);
(void)printf("%-*.*s %s Used Avail Capacity",
maxwidth, maxwidth, "Filesystem", header);
} else {
if (kflag) {
blocksize = 1024;
header = "1K-blocks";
headerlen = strlen(header);
} else
header = getbsize(&headerlen, &blocksize);
(void)printf("%-*.*s %s Used Avail Capacity",
maxwidth, maxwidth, "Filesystem", header);
}
if (iflag)
(void)printf(" iused ifree %%iused");
(void)printf(" Mounted on\n");
for (i = 0; i < mntsize; i++)
prtstat(&mntbuf[i], maxwidth, headerlen, blocksize);
return;
}
/*
* Print in format defined by POSIX 1002.2, invoke with -P option.
*/
void
posixprint(struct statfs *mntbuf, long mntsize, int maxwidth)
{
int i;
int blocksize;
char *blockstr;
struct statfs *sfsp;
long long used, avail;
double percentused;
if (kflag) {
blocksize = 1024;
blockstr = "1024-blocks";
} else {
blocksize = 512;
blockstr = " 512-blocks";
}
(void)printf(
"%-*.*s %s Used Available Capacity Mounted on\n",
maxwidth, maxwidth, "Filesystem", blockstr);
for (i = 0; i < mntsize; i++) {
sfsp = &mntbuf[i];
used = sfsp->f_blocks - sfsp->f_bfree;
avail = sfsp->f_bavail + used;
if (avail == 0)
percentused = 100.0;
else
percentused = (double)used / (double)avail * 100.0;
(void) printf ("%-*.*s %*lld %10lld %11lld %5.0f%% %s\n",
maxwidth, maxwidth, sfsp->f_mntfromname,
(int)strlen(blockstr),
fsbtoblk(sfsp->f_blocks, sfsp->f_bsize, blocksize),
fsbtoblk(used, sfsp->f_bsize, blocksize),
fsbtoblk(sfsp->f_bavail, sfsp->f_bsize, blocksize),
percentused, sfsp->f_mntonname);
}
}
int
raw_df(char *file, struct statfs *sfsp)
{
int rfd, ret = -1;
if ((rfd = open(file, O_RDONLY)) < 0) {
warn("%s", file);
return (-1);
}
if (ffs_df(rfd, file, sfsp) == 0) {
ret = 0;
} else if (e2fs_df(rfd, file, sfsp) == 0) {
ret = 0;
}
close (rfd);
return (ret);
}
int
bread(int rfd, off_t off, void *buf, int cnt)
{
int nr;
(void)lseek(rfd, off, SEEK_SET);
if ((nr = read(rfd, buf, cnt)) != cnt) {
/* Probably a dismounted disk if errno == EIO. */
if (errno != EIO)
(void)fprintf(stderr, "\ndf: %qd: %s\n",
off, strerror(nr > 0 ? EIO : errno));
return (0);
}
return (1);
}
void
usage(void)
{
(void)fprintf(stderr,
"usage: %s [-hiklnP] [-t type] [[file | file_system] ...]\n",
__progname);
exit(1);
}