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 + 1024/2 ) / 1024;
36 int df_main(int argc, char **argv);
37 int df_main(int argc, char **argv)
40 long blocks_percent_used;
41 #ifdef CONFIG_FEATURE_HUMAN_READABLE
42 unsigned long df_disp_hr = 1024;
44 int status = EXIT_SUCCESS;
47 struct mntent *mount_entry;
49 static const char hdr_1k[] = "1k-blocks"; /* default display is kilobytes */
50 const char *disp_units_hdr = hdr_1k;
52 #ifdef CONFIG_FEATURE_HUMAN_READABLE
53 opt_complementary = "h-km:k-hm:m-hk";
54 opt = getopt32(argc, argv, "hmk");
57 disp_units_hdr = " Size";
60 df_disp_hr = 1024*1024;
61 disp_units_hdr = "1M-blocks";
64 opt = getopt32(argc, argv, "k");
67 printf("Filesystem%11s%-15sUsed Available Use%% Mounted on\n",
73 mount_table = setmntent(bb_path_mtab_file, "r");
75 bb_perror_msg_and_die(bb_path_mtab_file);
81 const char *mount_point;
84 mount_entry = getmntent(mount_table);
86 endmntent(mount_table);
90 mount_point = *argv++;
94 mount_entry = find_mount_point(mount_point, bb_path_mtab_file);
96 bb_error_msg("%s: can't find mount point", mount_point);
98 status = EXIT_FAILURE;
103 device = mount_entry->mnt_fsname;
104 mount_point = mount_entry->mnt_dir;
106 if (statfs(mount_point, &s) != 0) {
107 bb_perror_msg("%s", mount_point);
111 if ((s.f_blocks > 0) || !mount_table){
112 blocks_used = s.f_blocks - s.f_bfree;
113 blocks_percent_used = 0;
114 if (blocks_used + s.f_bavail) {
115 blocks_percent_used = (((long long) blocks_used) * 100
116 + (blocks_used + s.f_bavail)/2
117 ) / (blocks_used + s.f_bavail);
120 if (strcmp(device, "rootfs") == 0) {
122 } else if (strcmp(device, "/dev/root") == 0) {
123 /* Adjusts device to be the real root device,
124 * or leaves device alone if it can't find it */
125 device = find_block_device("/");
131 #ifdef CONFIG_FEATURE_HUMAN_READABLE
132 printf("%-20s %9s ", device,
133 make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
136 make_human_readable_str( (s.f_blocks - s.f_bfree),
137 s.f_bsize, df_disp_hr));
139 printf("%9s %3ld%% %s\n",
140 make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
141 blocks_percent_used, mount_point);
143 printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
145 kscale(s.f_blocks, s.f_bsize),
146 kscale(s.f_blocks-s.f_bfree, s.f_bsize),
147 kscale(s.f_bavail, s.f_bsize),
148 blocks_percent_used, mount_point);
154 fflush_stdout_and_exit(status);