bin/df/df.c

/*
 * Copyright (c) 1980, 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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
char copyright[] =
"@(#) Copyright (c) 1980, 1990 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)df.c        5.30 (Berkeley) 4/23/92";
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int      bread __P((long, char *, int));
char    *getbsize __P((char *, int *, long *));
char    *getmntpt __P((char *));
void     prtstat __P((struct statfs *, long));
void     ufs_df __P((char *, long));
void     usage __P((void));

int     iflag, kflag, nflag;
struct  ufs_args mdev;

int
main(argc, argv)
        int argc;
        char *argv[];
{
        struct stat stbuf;
        struct statfs statfsbuf, *mntbuf;
        long width, maxwidth, mntsize;
        int err, ch, i;
        char *mntpt;

        iflag = kflag = nflag = 0;
        while ((ch = getopt(argc, argv, "ikn")) != EOF)
                switch(ch) {
                case 'i':
                        iflag = 1;
                        break;
                case 'k':
                        kflag = 1;
                        break;
                case 'n':
                        nflag = 1;
                        break;
                case '?':
                default:
                        usage();
                }
        argc -= optind;
        argv += optind;

        mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
        maxwidth = 0;
        for (i = 0; i < mntsize; i++) {
                width = strlen(mntbuf[i].f_mntfromname);
                if (width > maxwidth)
                        maxwidth = width;
        }
        if (!*argv) {
                mntsize = getmntinfo(&mntbuf, (nflag ? MNT_NOWAIT : MNT_WAIT));
                for (i = 0; i < mntsize; i++)
                        prtstat(&mntbuf[i], maxwidth);
                exit(0);
        }
        for (; *argv; argv++) {
                if (stat(*argv, &stbuf) < 0) {
                        err = errno;
                        if ((mntpt = getmntpt(*argv)) == 0) {
                                fprintf(stderr, "df: %s: %s\n", *argv,
                                    strerror(err));
                                continue;
                        }
                } else if ((stbuf.st_mode & S_IFMT) == S_IFCHR) {
                        ufs_df(*argv, maxwidth);
                        continue;
                } else if ((stbuf.st_mode & S_IFMT) == S_IFBLK) {
                        if ((mntpt = getmntpt(*argv)) == 0) {
                                mntpt = mktemp(strdup("/tmp/df.XXXXXX"));
                                mdev.fspec = *argv;
                                if (mkdir(mntpt, DEFFILEMODE) != 0) {
                                        fprintf(stderr, "df: %s: %s\n",
                                            mntpt, strerror(errno));
                                        continue;
                                }
                                if (mount(MOUNT_UFS, mntpt, MNT_RDONLY,
                                    &mdev) != 0) {
                                        ufs_df(*argv, maxwidth);
                                        (void)rmdir(mntpt);
                                        continue;
                                } else if (statfs(mntpt, &statfsbuf)) {
                                        statfsbuf.f_mntonname[0] = '\0';
                                        prtstat(&statfsbuf, maxwidth);
                                } else
                                        fprintf(stderr, "df: %s: %s\n",
                                            *argv, strerror(errno));
                                (void)unmount(mntpt, MNT_NOFORCE);
                                (void)rmdir(mntpt);
                                continue;
                        }
                } else
                        mntpt = *argv;
                /*
                 * Statfs does not take a `wait' flag, so we cannot
                 * implement nflag here.
                 */
                if (statfs(mntpt, &statfsbuf) < 0) {
                        fprintf(stderr,
                            "df: %s: %s\n", mntpt, strerror(errno));
                        continue;
                }
                if (argc == 1)
                        maxwidth = strlen(statfsbuf.f_mntfromname) + 1;
                prtstat(&statfsbuf, maxwidth);
        }
        return (0);
}

char *
getmntpt(name)
        char *name;
{
        long mntsize, i;
        struct statfs *mntbuf;

        mntsize = getmntinfo(&mntbuf, (nflag ? MNT_NOWAIT : MNT_WAIT));
        for (i = 0; i < mntsize; i++) {
                if (!strcmp(mntbuf[i].f_mntfromname, name))
                        return (mntbuf[i].f_mntonname);
        }
        return (0);
}

/*
 * Print out status about a filesystem.
 */
void
prtstat(sfsp, maxwidth)
        register struct statfs *sfsp;
        long maxwidth;
{
        static long blocksize;
        static int headerlen, timesthrough;
        static char *header;
        long used, availblks, inodes;

        if (maxwidth < 11)
                maxwidth = 11;
        if (++timesthrough == 1) {
                header = getbsize("df", &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");
        }
        (void)printf("%-*.*s", maxwidth, maxwidth, sfsp->f_mntfromname);
        used = sfsp->f_blocks - sfsp->f_bfree;
        availblks = sfsp->f_bavail + used;
        (void)printf(" %*ld %7ld %7ld", headerlen,
            sfsp->f_blocks * sfsp->f_fsize / blocksize,
            used * sfsp->f_fsize / blocksize,
            sfsp->f_bavail * sfsp->f_fsize / 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(" %7ld %7ld %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);
}

/*
 * This code constitutes the old df code for extracting
 * information from filesystem superblocks.
 */
#include <ufs/fs.h>
#include <errno.h>
#include <fstab.h>

union {
        struct fs iu_fs;
        char dummy[SBSIZE];
} sb;
#define sblock sb.iu_fs

int     fi;

void
ufs_df(file, maxwidth)
        char *file;
        long maxwidth;
{
        struct statfs statfsbuf;
        register struct statfs *sfsp;
        char *mntpt;
        static int synced;

        if (synced++ == 0)
                sync();

        if ((fi = open(file, O_RDONLY)) < 0) {
                (void)fprintf(stderr, "df: %s: %s\n", file, strerror(errno));
                return;
        }
        if (bread((long)SBOFF, (char *)&sblock, SBSIZE) == 0) {
                (void)close(fi);
                return;
        }
        sfsp = &statfsbuf;
        sfsp->f_type = MOUNT_UFS;
        sfsp->f_flags = 0;
        sfsp->f_bsize = sblock.fs_fsize;
#ifdef notyet
        sfsp->f_iosize = sblock.fs_bsize;
#endif
        sfsp->f_blocks = sblock.fs_dsize;
        sfsp->f_bfree = sblock.fs_cstotal.cs_nbfree * sblock.fs_frag +
                sblock.fs_cstotal.cs_nffree;
        sfsp->f_bavail = (sblock.fs_dsize * (100 - sblock.fs_minfree) / 100) -
                (sblock.fs_dsize - sfsp->f_bfree);
        if (sfsp->f_bavail < 0)
                sfsp->f_bavail = 0;
        sfsp->f_files =  sblock.fs_ncg * sblock.fs_ipg;
        sfsp->f_ffree = sblock.fs_cstotal.cs_nifree;
        sfsp->f_fsid.val[0] = 0;
        sfsp->f_fsid.val[1] = 0;
        if ((mntpt = getmntpt(file)) == 0)
                mntpt = "";
        bcopy((caddr_t)mntpt, (caddr_t)&sfsp->f_mntonname[0], MNAMELEN);
        bcopy((caddr_t)file, (caddr_t)&sfsp->f_mntfromname[0], MNAMELEN);
        prtstat(sfsp, maxwidth);
        (void) close(fi);
}

int
bread(off, buf, cnt)
        long off;
        char *buf;
        int cnt;
{
        int n;

        (void) lseek(fi, off, SEEK_SET);
        if ((n=read(fi, buf, cnt)) != cnt) {
                /* probably a dismounted disk if errno == EIO */
                if (errno != EIO) {
                        (void)printf("\nread error off = %ld\n", off);
                        (void)printf("count = %d: %s\n", n, strerror(errno));
                }
                return (0);
        }
        return (1);
}

void
usage()
{
        (void)fprintf(stderr, "usage: df [-in] [file | file_system ...]\n");
        exit(1);
}