busybox/coreutils/df.c

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/* vi: set sw=4 ts=4: */
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/*
* Mini df implementation for busybox
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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* based on original code by (I think) Bruce Perens <bruce@pixar.com>.
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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/* BB_AUDIT SUSv3 _NOT_ compliant -- options -P and -t missing. Also blocksize. */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
*
* Size reduction. Removed floating point dependency. Added error checking
* on output. Output stats on 0-sized filesystems if specifically listed on
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* the command line. Properly round *-blocks, Used, and Available quantities.
*/
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include <unistd.h>
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#include <mntent.h>
#include <sys/vfs.h>
#include "busybox.h"
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#ifndef CONFIG_FEATURE_HUMAN_READABLE
static long kscale(long b, long bs)
{
return ( b * (long long) bs + KILOBYTE/2 ) / KILOBYTE;
}
#endif
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int df_main(int argc, char **argv)
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{
long blocks_used;
long blocks_percent_used;
#ifdef CONFIG_FEATURE_HUMAN_READABLE
unsigned long df_disp_hr = KILOBYTE;
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#endif
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int status = EXIT_SUCCESS;
unsigned long opt;
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FILE *mount_table;
struct mntent *mount_entry;
struct statfs s;
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static const char hdr_1k[] = "1k-blocks"; /* default display is kilobytes */
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const char *disp_units_hdr = hdr_1k;
#ifdef CONFIG_FEATURE_HUMAN_READABLE
bb_opt_complementally = "h-km:k-hm:m-hk";
opt = bb_getopt_ulflags(argc, argv, "hmk");
if(opt & 1) {
df_disp_hr = 0;
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disp_units_hdr = " Size";
}
if(opt & 2) {
df_disp_hr = MEGABYTE;
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disp_units_hdr = "1M-blocks";
}
#else
opt = bb_getopt_ulflags(argc, argv, "k");
#endif
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bb_printf("Filesystem%11s%-15sUsed Available Use%% Mounted on\n",
"", disp_units_hdr);
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mount_table = NULL;
argv += optind;
if (optind >= argc) {
if (!(mount_table = setmntent(bb_path_mtab_file, "r"))) {
bb_perror_msg_and_die(bb_path_mtab_file);
}
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}
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do {
const char *device;
const char *mount_point;
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if (mount_table) {
if (!(mount_entry = getmntent(mount_table))) {
endmntent(mount_table);
break;
}
} else {
if (!(mount_point = *argv++)) {
break;
}
if (!(mount_entry = find_mount_point(mount_point, bb_path_mtab_file))) {
bb_error_msg("%s: can't find mount point.", mount_point);
SET_ERROR:
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status = EXIT_FAILURE;
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continue;
}
}
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device = mount_entry->mnt_fsname;
mount_point = mount_entry->mnt_dir;
if (statfs(mount_point, &s) != 0) {
bb_perror_msg("%s", mount_point);
goto SET_ERROR;
}
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if ((s.f_blocks > 0) || !mount_table){
blocks_used = s.f_blocks - s.f_bfree;
blocks_percent_used = 0;
if (blocks_used + s.f_bavail) {
blocks_percent_used = (((long long) blocks_used) * 100
+ (blocks_used + s.f_bavail)/2
) / (blocks_used + s.f_bavail);
}
if (strcmp(device, "rootfs") == 0) {
continue;
} else if (strcmp(device, "/dev/root") == 0) {
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/* Adjusts device to be the real root device,
* or leaves device alone if it can't find it */
Major rewrite of mount, umount, losetup. Untangled lots of code, shrunk things down a bit, fixed a number of funky corner cases, added support for several new features (things like mount --move, mount --bind, lazy unounts, automatic detection of loop mounts, and so on). Probably broke several other things, but it's fixable. (Bang on it, tell me what doesn't work for you...) Note: you no longer need to say "-o loop". It does that for you when necessary. Still need to add "user mount" support, which involves making mount suid. Not too hard to do under the new infrastructure, just haven't done it yet... The previous code had the following notes, that belong in the version control comments: - * 3/21/1999 Charles P. Wright <cpwright@cpwright.com> - * searches through fstab when -a is passed - * will try mounting stuff with all fses when passed -t auto - * - * 1999-04-17 Dave Cinege...Rewrote -t auto. Fixed ro mtab. - * - * 1999-10-07 Erik Andersen <andersen@codepoet.org>. - * Rewrite of a lot of code. Removed mtab usage (I plan on - * putting it back as a compile-time option some time), - * major adjustments to option parsing, and some serious - * dieting all around. - * - * 1999-11-06 mtab support is back - andersee - * - * 2000-01-12 Ben Collins <bcollins@debian.org>, Borrowed utils-linux's - * mount to add loop support. - * - * 2000-04-30 Dave Cinege <dcinege@psychosis.com> - * Rewrote fstab while loop and lower mount section. Can now do - * single mounts from fstab. Can override fstab options for single - * mount. Common mount_one call for single mounts and 'all'. Fixed - * mtab updating and stale entries. Removed 'remount' default. - *
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if ((device = find_block_device("/")) == NULL) {
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goto SET_ERROR;
}
}
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#ifdef CONFIG_FEATURE_HUMAN_READABLE
bb_printf("%-20s %9s ", device,
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make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
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bb_printf("%9s ",
make_human_readable_str( (s.f_blocks - s.f_bfree),
s.f_bsize, df_disp_hr));
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bb_printf("%9s %3ld%% %s\n",
make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
blocks_percent_used, mount_point);
#else
bb_printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
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device,
kscale(s.f_blocks, s.f_bsize),
kscale(s.f_blocks-s.f_bfree, s.f_bsize),
kscale(s.f_bavail, s.f_bsize),
blocks_percent_used, mount_point);
#endif
}
} while (1);
bb_fflush_stdout_and_exit(status);
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}