463 lines
11 KiB
C
463 lines
11 KiB
C
/* $OpenBSD: df.c,v 1.61 2023/01/01 16:31:20 millert Exp $ */
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/* $NetBSD: df.c,v 1.21.2.1 1995/11/01 00:06:11 jtc Exp $ */
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/*
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* Copyright (c) 1980, 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/stat.h>
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#include <sys/mount.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <util.h>
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int bread(int, off_t, void *, int);
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static void bsdprint(struct statfs *, long, int);
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char *getmntpt(char *);
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static void maketypelist(char *);
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static int percent(u_int64_t, u_int64_t);
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static void posixprint(struct statfs *, long, int);
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static void prthuman(struct statfs *sfsp, unsigned long long);
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static void prthumanval(long long);
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static void prtstat(struct statfs *, int, int, int);
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static long regetmntinfo(struct statfs **, long);
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static int selected(const char *);
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static __dead void usage(void);
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extern int e2fs_df(int, char *, struct statfs *);
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extern int ffs_df(int, char *, struct statfs *);
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static int raw_df(char *, struct statfs *);
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int hflag, iflag, kflag, lflag, nflag, Pflag;
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char **typelist = NULL;
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int
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main(int argc, char *argv[])
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{
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struct stat stbuf;
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struct statfs *mntbuf;
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long mntsize;
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int ch, i;
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int width, maxwidth;
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char *mntpt;
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if (pledge("stdio rpath", NULL) == -1)
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err(1, "pledge");
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while ((ch = getopt(argc, argv, "hiklnPt:")) != -1)
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switch (ch) {
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case 'h':
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hflag = 1;
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kflag = 0;
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break;
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case 'i':
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iflag = 1;
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break;
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case 'k':
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kflag = 1;
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hflag = 0;
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break;
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case 'l':
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lflag = 1;
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break;
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case 'n':
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nflag = 1;
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break;
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case 'P':
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Pflag = 1;
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break;
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case 't':
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if (typelist != NULL)
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errx(1, "only one -t option may be specified.");
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maketypelist(optarg);
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break;
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if ((iflag || hflag) && Pflag) {
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warnx("-h and -i are incompatible with -P");
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usage();
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}
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mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
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if (mntsize == 0)
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err(1, "retrieving information on mounted file systems");
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if (!*argv) {
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mntsize = regetmntinfo(&mntbuf, mntsize);
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} else {
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mntbuf = calloc(argc, sizeof(struct statfs));
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if (mntbuf == NULL)
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err(1, NULL);
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mntsize = 0;
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for (; *argv; argv++) {
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if (stat(*argv, &stbuf) == -1) {
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if ((mntpt = getmntpt(*argv)) == 0) {
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warn("%s", *argv);
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continue;
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}
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} else if (S_ISCHR(stbuf.st_mode) || S_ISBLK(stbuf.st_mode)) {
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if (!raw_df(*argv, &mntbuf[mntsize]))
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++mntsize;
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continue;
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} else
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mntpt = *argv;
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/*
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* Statfs does not take a `wait' flag, so we cannot
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* implement nflag here.
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*/
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if (!statfs(mntpt, &mntbuf[mntsize]))
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if (lflag && (mntbuf[mntsize].f_flags & MNT_LOCAL) == 0)
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warnx("%s is not a local file system",
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*argv);
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else if (!selected(mntbuf[mntsize].f_fstypename))
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warnx("%s mounted as a %s file system",
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*argv, mntbuf[mntsize].f_fstypename);
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else
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++mntsize;
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else
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warn("%s", *argv);
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}
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}
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if (mntsize) {
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maxwidth = 11;
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for (i = 0; i < mntsize; i++) {
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width = strlen(mntbuf[i].f_mntfromname);
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if (width > maxwidth)
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maxwidth = width;
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}
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if (Pflag)
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posixprint(mntbuf, mntsize, maxwidth);
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else
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bsdprint(mntbuf, mntsize, maxwidth);
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}
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return (mntsize ? 0 : 1);
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}
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char *
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getmntpt(char *name)
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{
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long mntsize, i;
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struct statfs *mntbuf;
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mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
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for (i = 0; i < mntsize; i++) {
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if (!strcmp(mntbuf[i].f_mntfromname, name))
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return (mntbuf[i].f_mntonname);
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}
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return (0);
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}
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static enum { IN_LIST, NOT_IN_LIST } which;
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static int
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selected(const char *type)
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{
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char **av;
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/* If no type specified, it's always selected. */
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if (typelist == NULL)
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return (1);
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for (av = typelist; *av != NULL; ++av)
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if (!strncmp(type, *av, MFSNAMELEN))
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return (which == IN_LIST ? 1 : 0);
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return (which == IN_LIST ? 0 : 1);
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}
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static void
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maketypelist(char *fslist)
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{
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int i;
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char *nextcp, **av;
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if ((fslist == NULL) || (fslist[0] == '\0'))
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errx(1, "empty type list");
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/*
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* XXX
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* Note: the syntax is "noxxx,yyy" for no xxx's and
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* no yyy's, not the more intuitive "noyyy,noyyy".
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*/
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if (fslist[0] == 'n' && fslist[1] == 'o') {
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fslist += 2;
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which = NOT_IN_LIST;
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} else
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which = IN_LIST;
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/* Count the number of types. */
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for (i = 1, nextcp = fslist; (nextcp = strchr(nextcp, ',')) != NULL; i++)
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++nextcp;
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/* Build an array of that many types. */
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if ((av = typelist = calloc(i + 1, sizeof(char *))) == NULL)
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err(1, NULL);
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av[0] = fslist;
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for (i = 1, nextcp = fslist; (nextcp = strchr(nextcp, ',')) != NULL; i++) {
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*nextcp = '\0';
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av[i] = ++nextcp;
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}
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/* Terminate the array. */
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av[i] = NULL;
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}
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/*
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* Make a pass over the filesystem info in ``mntbuf'' filtering out
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* filesystem types not in ``fsmask'' and possibly re-stating to get
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* current (not cached) info. Returns the new count of valid statfs bufs.
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*/
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static long
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regetmntinfo(struct statfs **mntbufp, long mntsize)
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{
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int i, j;
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struct statfs *mntbuf;
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if (!lflag && typelist == NULL)
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return (nflag ? mntsize : getmntinfo(mntbufp, MNT_WAIT));
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mntbuf = *mntbufp;
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j = 0;
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for (i = 0; i < mntsize; i++) {
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if (lflag && (mntbuf[i].f_flags & MNT_LOCAL) == 0)
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continue;
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if (!selected(mntbuf[i].f_fstypename))
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continue;
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if (nflag)
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mntbuf[j] = mntbuf[i];
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else
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(void)statfs(mntbuf[i].f_mntonname, &mntbuf[j]);
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j++;
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}
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return (j);
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}
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/*
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* "human-readable" output: use 3 digits max.--put unit suffixes at
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* the end. Makes output compact and easy-to-read esp. on huge disks.
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* Code moved into libutil; this is now just a wrapper.
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*/
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static void
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prthumanval(long long bytes)
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{
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char ret[FMT_SCALED_STRSIZE];
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if (fmt_scaled(bytes, ret) == -1) {
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(void)printf(" %lld", bytes);
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return;
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}
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(void)printf(" %7s", ret);
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}
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static void
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prthuman(struct statfs *sfsp, unsigned long long used)
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{
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prthumanval(sfsp->f_blocks * sfsp->f_bsize);
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prthumanval(used * sfsp->f_bsize);
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prthumanval(sfsp->f_bavail * sfsp->f_bsize);
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}
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/*
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* Convert statfs returned filesystem size into BLOCKSIZE units.
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* Attempts to avoid overflow for large filesystems.
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*/
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#define fsbtoblk(num, fsbs, bs) \
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(((fsbs) != 0 && (fsbs) < (bs)) ? \
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(num) / ((bs) / (fsbs)) : (num) * ((fsbs) / (bs)))
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/*
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* Print out status about a filesystem.
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*/
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static void
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prtstat(struct statfs *sfsp, int maxwidth, int headerlen, int blocksize)
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{
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u_int64_t used, inodes;
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int64_t availblks;
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(void)printf("%-*.*s", maxwidth, maxwidth, sfsp->f_mntfromname);
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used = sfsp->f_blocks - sfsp->f_bfree;
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availblks = sfsp->f_bavail + used;
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if (hflag)
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prthuman(sfsp, used);
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else
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(void)printf(" %*llu %9llu %9lld", headerlen,
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fsbtoblk(sfsp->f_blocks, sfsp->f_bsize, blocksize),
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fsbtoblk(used, sfsp->f_bsize, blocksize),
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fsbtoblk(sfsp->f_bavail, sfsp->f_bsize, blocksize));
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(void)printf(" %5d%%", percent(used, availblks));
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if (iflag) {
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inodes = sfsp->f_files;
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used = inodes - sfsp->f_ffree;
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(void)printf(" %7llu %7llu %5d%% ", used, sfsp->f_ffree,
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percent(used, inodes));
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} else
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(void)printf(" ");
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(void)printf(" %s\n", sfsp->f_mntonname);
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}
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/*
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* Print in traditional BSD format.
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*/
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static void
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bsdprint(struct statfs *mntbuf, long mntsize, int maxwidth)
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{
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int i;
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char *header;
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int headerlen;
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long blocksize;
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/* Print the header line */
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if (hflag) {
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header = " Size";
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headerlen = strlen(header);
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(void)printf("%-*.*s %s Used Avail Capacity",
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maxwidth, maxwidth, "Filesystem", header);
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} else {
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if (kflag) {
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blocksize = 1024;
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header = "1K-blocks";
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headerlen = strlen(header);
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} else
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header = getbsize(&headerlen, &blocksize);
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(void)printf("%-*.*s %s Used Avail Capacity",
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maxwidth, maxwidth, "Filesystem", header);
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}
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if (iflag)
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(void)printf(" iused ifree %%iused");
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(void)printf(" Mounted on\n");
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for (i = 0; i < mntsize; i++)
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prtstat(&mntbuf[i], maxwidth, headerlen, blocksize);
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return;
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}
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static int
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percent(u_int64_t used, u_int64_t avail)
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{
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return avail ? (100 * used + (avail - 1)) / avail : 100;
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}
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/*
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* Print in format defined by POSIX 1002.2, invoke with -P option.
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*/
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static void
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posixprint(struct statfs *mntbuf, long mntsize, int maxwidth)
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{
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int i;
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int blocksize;
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char *blockstr;
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struct statfs *sfsp;
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long long used, avail;
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if (kflag) {
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blocksize = 1024;
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blockstr = "1024-blocks";
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} else {
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blocksize = 512;
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blockstr = " 512-blocks";
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}
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(void)printf(
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"%-*.*s %s Used Available Capacity Mounted on\n",
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maxwidth, maxwidth, "Filesystem", blockstr);
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for (i = 0; i < mntsize; i++) {
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sfsp = &mntbuf[i];
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used = sfsp->f_blocks - sfsp->f_bfree;
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avail = sfsp->f_bavail + used;
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(void) printf ("%-*.*s %*lld %10lld %11lld %5d%% %s\n",
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maxwidth, maxwidth, sfsp->f_mntfromname,
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(int)strlen(blockstr),
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fsbtoblk(sfsp->f_blocks, sfsp->f_bsize, blocksize),
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fsbtoblk(used, sfsp->f_bsize, blocksize),
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fsbtoblk(sfsp->f_bavail, sfsp->f_bsize, blocksize),
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percent(used, avail), sfsp->f_mntonname);
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}
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}
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static int
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raw_df(char *file, struct statfs *sfsp)
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{
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int rfd, ret = -1;
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if ((rfd = open(file, O_RDONLY)) == -1) {
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warn("%s", file);
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return (-1);
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}
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if (ffs_df(rfd, file, sfsp) == 0) {
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ret = 0;
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} else if (e2fs_df(rfd, file, sfsp) == 0) {
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ret = 0;
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}
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close (rfd);
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return (ret);
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}
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int
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bread(int rfd, off_t off, void *buf, int cnt)
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{
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int nr;
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if ((nr = pread(rfd, buf, cnt, off)) != cnt) {
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/* Probably a dismounted disk if errno == EIO. */
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if (errno != EIO)
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(void)fprintf(stderr, "\ndf: %lld: %s\n",
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(long long)off, strerror(nr > 0 ? EIO : errno));
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return (0);
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}
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return (1);
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}
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static __dead void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: %s [-hiklnP] [-t type] [[file | file_system] ...]\n",
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getprogname());
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exit(1);
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}
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