1 /* vi: set sw=4 ts=4: */
3 * Mini df implementation for busybox
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6 * based on original code by (I think) Bruce Perens <bruce@pixar.com>.
8 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
11 /* BB_AUDIT SUSv3 _NOT_ compliant -- options -P and -t missing. Also blocksize. */
12 /* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
14 /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
16 * Size reduction. Removed floating point dependency. Added error checking
17 * on output. Output stats on 0-sized filesystems if specifically listed on
18 * the command line. Properly round *-blocks, Used, and Available quantities.
29 #ifndef CONFIG_FEATURE_HUMAN_READABLE
30 static long kscale(long b, long bs)
32 return ( b * (long long) bs + KILOBYTE/2 ) / KILOBYTE;
36 int df_main(int argc, char **argv)
39 long blocks_percent_used;
40 #ifdef CONFIG_FEATURE_HUMAN_READABLE
41 unsigned long df_disp_hr = KILOBYTE;
43 int status = EXIT_SUCCESS;
46 struct mntent *mount_entry;
48 static const char hdr_1k[] = "1k-blocks"; /* default display is kilobytes */
49 const char *disp_units_hdr = hdr_1k;
51 #ifdef CONFIG_FEATURE_HUMAN_READABLE
52 bb_opt_complementally = "h-km:k-hm:m-hk";
53 opt = bb_getopt_ulflags(argc, argv, "hmk");
56 disp_units_hdr = " Size";
59 df_disp_hr = MEGABYTE;
60 disp_units_hdr = "1M-blocks";
63 opt = bb_getopt_ulflags(argc, argv, "k");
66 bb_printf("Filesystem%11s%-15sUsed Available Use%% Mounted on\n",
72 if (!(mount_table = setmntent(bb_path_mtab_file, "r"))) {
73 bb_perror_msg_and_die(bb_path_mtab_file);
79 const char *mount_point;
82 if (!(mount_entry = getmntent(mount_table))) {
83 endmntent(mount_table);
87 if (!(mount_point = *argv++)) {
90 if (!(mount_entry = find_mount_point(mount_point, bb_path_mtab_file))) {
91 bb_error_msg("%s: can't find mount point.", mount_point);
93 status = EXIT_FAILURE;
98 device = mount_entry->mnt_fsname;
99 mount_point = mount_entry->mnt_dir;
101 if (statfs(mount_point, &s) != 0) {
102 bb_perror_msg("%s", mount_point);
106 if ((s.f_blocks > 0) || !mount_table){
107 blocks_used = s.f_blocks - s.f_bfree;
108 blocks_percent_used = 0;
109 if (blocks_used + s.f_bavail) {
110 blocks_percent_used = (((long long) blocks_used) * 100
111 + (blocks_used + s.f_bavail)/2
112 ) / (blocks_used + s.f_bavail);
115 if (strcmp(device, "rootfs") == 0) {
117 } else if (strcmp(device, "/dev/root") == 0) {
118 /* Adjusts device to be the real root device,
119 * or leaves device alone if it can't find it */
120 if ((device = find_block_device("/")) == NULL) {
125 #ifdef CONFIG_FEATURE_HUMAN_READABLE
126 bb_printf("%-20s %9s ", device,
127 make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
130 make_human_readable_str( (s.f_blocks - s.f_bfree),
131 s.f_bsize, df_disp_hr));
133 bb_printf("%9s %3ld%% %s\n",
134 make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
135 blocks_percent_used, mount_point);
137 bb_printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
139 kscale(s.f_blocks, s.f_bsize),
140 kscale(s.f_blocks-s.f_bfree, s.f_bsize),
141 kscale(s.f_bavail, s.f_bsize),
142 blocks_percent_used, mount_point);
148 bb_fflush_stdout_and_exit(status);