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.
25 #if !ENABLE_FEATURE_HUMAN_READABLE
26 static unsigned long kscale(unsigned long b, unsigned long bs)
28 return (b * (unsigned long long) bs + 1024/2) / 1024;
32 int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
33 int df_main(int argc, char **argv)
35 unsigned long blocks_used;
36 unsigned blocks_percent_used;
37 #if ENABLE_FEATURE_HUMAN_READABLE
38 unsigned df_disp_hr = 1024;
40 int status = EXIT_SUCCESS;
43 struct mntent *mount_entry;
45 /* default display is kilobytes */
46 const char *disp_units_hdr = "1k-blocks";
50 OPT_INODE = (ENABLE_FEATURE_HUMAN_READABLE ? (1 << 4) : (1 << 2))
51 * ENABLE_FEATURE_DF_INODE
54 #if ENABLE_FEATURE_HUMAN_READABLE
55 opt_complementary = "h-km:k-hm:m-hk";
56 opt = getopt32(argv, "ahmk" USE_FEATURE_DF_INODE("i"));
57 if (opt & (1 << 1)) { // -h
59 disp_units_hdr = " Size";
61 if (opt & (1 << 2)) { // -m
62 df_disp_hr = 1024*1024;
63 disp_units_hdr = "1M-blocks";
65 if (opt & OPT_INODE) {
66 disp_units_hdr = " Inodes";
69 opt = getopt32(argv, "ak" USE_FEATURE_DF_INODE("i"));
72 printf("Filesystem %-15sUsed Available Use%% Mounted on\n",
78 mount_table = setmntent(bb_path_mtab_file, "r");
80 bb_perror_msg_and_die(bb_path_mtab_file);
86 const char *mount_point;
89 mount_entry = getmntent(mount_table);
91 endmntent(mount_table);
95 mount_point = *argv++;
99 mount_entry = find_mount_point(mount_point, bb_path_mtab_file);
101 bb_error_msg("%s: can't find mount point", mount_point);
103 status = EXIT_FAILURE;
108 device = mount_entry->mnt_fsname;
109 mount_point = mount_entry->mnt_dir;
111 if (statfs(mount_point, &s) != 0) {
112 bb_simple_perror_msg(mount_point);
116 if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
117 if (opt & OPT_INODE) {
118 s.f_blocks = s.f_files;
119 s.f_bavail = s.f_bfree = s.f_ffree;
121 #if ENABLE_FEATURE_HUMAN_READABLE
126 blocks_used = s.f_blocks - s.f_bfree;
127 blocks_percent_used = 0;
128 if (blocks_used + s.f_bavail) {
129 blocks_percent_used = (blocks_used * 100ULL
130 + (blocks_used + s.f_bavail)/2
131 ) / (blocks_used + s.f_bavail);
134 #ifdef WHY_IT_SHOULD_BE_HIDDEN
135 if (strcmp(device, "rootfs") == 0) {
139 #ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
140 /* ... and also this is the only user of find_block_device */
141 if (strcmp(device, "/dev/root") == 0) {
142 /* Adjusts device to be the real root device,
143 * or leaves device alone if it can't find it */
144 device = find_block_device("/");
151 if (printf("\n%-20s" + 1, device) > 20)
152 printf("\n%-20s", "");
153 #if ENABLE_FEATURE_HUMAN_READABLE
155 make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
158 make_human_readable_str((s.f_blocks - s.f_bfree),
159 s.f_bsize, df_disp_hr));
161 printf("%9s %3u%% %s\n",
162 make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
163 blocks_percent_used, mount_point);
165 printf(" %9lu %9lu %9lu %3u%% %s\n",
166 kscale(s.f_blocks, s.f_bsize),
167 kscale(s.f_blocks-s.f_bfree, s.f_bsize),
168 kscale(s.f_bavail, s.f_bsize),
169 blocks_percent_used, mount_point);
174 fflush_stdout_and_exit(status);