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![Julian Elischer](/assets/img/avatar_default.png)
be ignored by default by the df(1) program. This is used mostly to avoid stat()-ing entries that do not represent "real" disk mount points (such as those made by an automounter such as amd.) It is also useful not to have to stat() these entries because it takes longer to report them that for other file systems, being that these mount points are served by a user-level file server and resulting in several context switches. Worse, if the automounter is down unexpectedly, a causal df(1) will hang in an interruptible way. PR: kern/9764 Submitted by: Erez Zadok <ezk@cs.columbia.edu>
388 lines
9.8 KiB
C
388 lines
9.8 KiB
C
/*
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1980, 1990, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)df.c 8.9 (Berkeley) 5/8/95";
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#else
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static const char rcsid[] =
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"$FreeBSD$";
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/mount.h>
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#include <ufs/ufs/ufsmount.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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int checkvfsname __P((const char *, char **));
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char **makevfslist __P((char *));
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long regetmntinfo __P((struct statfs **, long, char **));
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int bread __P((off_t, void *, int));
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char *getmntpt __P((char *));
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void prtstat __P((struct statfs *, int));
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int ufs_df __P((char *, int));
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void usage __P((void));
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int aflag = 0, iflag, nflag;
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struct ufs_args mdev;
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct stat stbuf;
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struct statfs statfsbuf, *mntbuf;
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long mntsize;
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int ch, err, i, maxwidth, rv, width;
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char *mntpt, *mntpath, **vfslist;
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vfslist = NULL;
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while ((ch = getopt(argc, argv, "aiknt:")) != -1)
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switch (ch) {
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case 'a':
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aflag = 1;
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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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putenv("BLOCKSIZE=1k");
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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 't':
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if (vfslist != NULL)
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errx(1, "only one -t option may be specified.");
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vfslist = makevfslist(optarg);
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break;
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case '?':
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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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mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
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maxwidth = 0;
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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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rv = 0;
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if (!*argv) {
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mntsize = regetmntinfo(&mntbuf, mntsize, vfslist);
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if (vfslist != NULL) {
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maxwidth = 0;
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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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}
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for (i = 0; i < mntsize; i++) {
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if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0)
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prtstat(&mntbuf[i], maxwidth);
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}
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exit(rv);
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}
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for (; *argv; argv++) {
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if (stat(*argv, &stbuf) < 0) {
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err = errno;
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if ((mntpt = getmntpt(*argv)) == 0) {
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warn("%s", *argv);
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rv = 1;
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continue;
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}
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} else if ((stbuf.st_mode & S_IFMT) == S_IFCHR) {
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rv = ufs_df(*argv, maxwidth) || rv;
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continue;
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} else if ((stbuf.st_mode & S_IFMT) == S_IFBLK) {
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if ((mntpt = getmntpt(*argv)) == 0) {
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mdev.fspec = *argv;
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mntpath = strdup("/tmp/df.XXXXXX");
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if (mntpath == NULL) {
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warn("strdup failed");
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rv = 1;
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continue;
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}
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mntpt = mkdtemp(mntpath);
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if (mntpt == NULL) {
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warn("mkdtemp(\"%s\") failed", mntpath);
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rv = 1;
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free(mntpath);
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continue;
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}
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if (mount("ufs", mntpt, MNT_RDONLY,
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&mdev) != 0) {
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rv = ufs_df(*argv, maxwidth) || rv;
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(void)rmdir(mntpt);
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free(mntpath);
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continue;
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} else if (statfs(mntpt, &statfsbuf) == 0) {
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statfsbuf.f_mntonname[0] = '\0';
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prtstat(&statfsbuf, maxwidth);
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} else {
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warn("%s", *argv);
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rv = 1;
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}
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(void)unmount(mntpt, 0);
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(void)rmdir(mntpt);
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free(mntpath);
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continue;
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}
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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, &statfsbuf) < 0) {
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warn("%s", mntpt);
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rv = 1;
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continue;
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}
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if (argc == 1)
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maxwidth = strlen(statfsbuf.f_mntfromname) + 1;
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prtstat(&statfsbuf, maxwidth);
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}
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return (rv);
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}
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char *
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getmntpt(name)
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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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/*
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* Make a pass over the filesystem info in ``mntbuf'' filtering out
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* filesystem types not in vfslist 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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long
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regetmntinfo(mntbufp, mntsize, vfslist)
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struct statfs **mntbufp;
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long mntsize;
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char **vfslist;
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{
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int i, j;
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struct statfs *mntbuf;
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if (vfslist == NULL)
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return (nflag ? mntsize : getmntinfo(mntbufp, MNT_WAIT));
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mntbuf = *mntbufp;
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for (j = 0, i = 0; i < mntsize; i++) {
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if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
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continue;
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if (!nflag)
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(void)statfs(mntbuf[i].f_mntonname,&mntbuf[j]);
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else if (i != j)
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mntbuf[j] = mntbuf[i];
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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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* 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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void
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prtstat(sfsp, maxwidth)
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struct statfs *sfsp;
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int maxwidth;
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{
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static long blocksize;
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static int headerlen, timesthrough;
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static char *header;
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long used, availblks, inodes;
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if (maxwidth < 11)
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maxwidth = 11;
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if (++timesthrough == 1) {
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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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if (iflag)
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(void)printf(" iused ifree %%iused");
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(void)printf(" Mounted on\n");
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}
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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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(void)printf(" %*ld %8ld %8ld", 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(" %5.0f%%",
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availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
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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(" %7ld %7ld %5.0f%% ", used, sfsp->f_ffree,
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inodes == 0 ? 100.0 : (double)used / (double)inodes * 100.0);
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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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* This code constitutes the pre-system call Berkeley df code for extracting
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* information from filesystem superblocks.
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*/
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#include <ufs/ufs/dinode.h>
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#include <ufs/ffs/fs.h>
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#include <errno.h>
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#include <fstab.h>
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union {
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struct fs iu_fs;
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char dummy[SBSIZE];
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} sb;
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#define sblock sb.iu_fs
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int rfd;
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int
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ufs_df(file, maxwidth)
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char *file;
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int maxwidth;
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{
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struct statfs statfsbuf;
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struct statfs *sfsp;
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char *mntpt;
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static int synced;
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if (synced++ == 0)
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sync();
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if ((rfd = open(file, O_RDONLY)) < 0) {
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warn("%s", file);
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return (1);
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}
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if (bread((off_t)SBOFF, &sblock, SBSIZE) == 0) {
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(void)close(rfd);
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return (1);
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}
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sfsp = &statfsbuf;
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sfsp->f_type = 1;
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strcpy(sfsp->f_fstypename, "ufs");
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sfsp->f_flags = 0;
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sfsp->f_bsize = sblock.fs_fsize;
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sfsp->f_iosize = sblock.fs_bsize;
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sfsp->f_blocks = sblock.fs_dsize;
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sfsp->f_bfree = sblock.fs_cstotal.cs_nbfree * sblock.fs_frag +
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sblock.fs_cstotal.cs_nffree;
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sfsp->f_bavail = freespace(&sblock, sblock.fs_minfree);
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sfsp->f_files = sblock.fs_ncg * sblock.fs_ipg;
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sfsp->f_ffree = sblock.fs_cstotal.cs_nifree;
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sfsp->f_fsid.val[0] = 0;
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sfsp->f_fsid.val[1] = 0;
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if ((mntpt = getmntpt(file)) == 0)
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mntpt = "";
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memmove(&sfsp->f_mntonname[0], mntpt, MNAMELEN);
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memmove(&sfsp->f_mntfromname[0], file, MNAMELEN);
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prtstat(sfsp, maxwidth);
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(void)close(rfd);
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return (0);
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}
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int
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bread(off, buf, cnt)
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off_t off;
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void *buf;
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int cnt;
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{
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int nr;
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(void)lseek(rfd, off, SEEK_SET);
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if ((nr = read(rfd, buf, cnt)) != 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: %qd: %s\n",
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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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void
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usage()
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{
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(void)fprintf(stderr,
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"usage: df [-aikn] [-t type] [file | filesystem ...]\n");
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exit(1);
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}
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