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 -- option -t missing. */
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.
20 * Aug 28, 2008 Bernhard Reutner-Fischer
22 * Implement -P and -B; better coreutils compat; cleanup
29 #if !ENABLE_FEATURE_HUMAN_READABLE
30 static unsigned long kscale(unsigned long b, unsigned long bs)
32 return (b * (unsigned long long) bs + 1024/2) / 1024;
36 int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
37 int df_main(int argc, char **argv)
39 unsigned long blocks_used;
40 unsigned blocks_percent_used;
41 unsigned long df_disp_hr = 1024;
42 int status = EXIT_SUCCESS;
45 struct mntent *mount_entry;
47 static const char ignored_mounts[] ALIGN1 = "rootfs\0";
52 OPT_ALL = (1 << 2) * ENABLE_FEATURE_DF_FANCY,
53 OPT_INODE = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
54 OPT_BSIZE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
55 OPT_HUMAN = (1 << (2 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
56 OPT_MEGA = (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
58 const char *disp_units_hdr = NULL;
61 #if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
62 opt_complementary = "k-mB:m-Bk:B-km";
63 #elif ENABLE_FEATURE_HUMAN_READABLE
64 opt_complementary = "k-m:m-k";
66 opt = getopt32(argv, "kP"
67 IF_FEATURE_DF_FANCY("aiB:")
68 IF_FEATURE_HUMAN_READABLE("hm")
69 IF_FEATURE_DF_FANCY(, &chp));
71 df_disp_hr = 1024*1024;
74 df_disp_hr = xatoul_range(chp, 1, ULONG_MAX); /* disallow 0 */
76 /* From the manpage of df from coreutils-6.10:
77 Disk space is shown in 1K blocks by default, unless the environment
78 variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
80 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
83 if (opt & OPT_HUMAN) {
85 disp_units_hdr = " Size";
88 disp_units_hdr = " Inodes";
90 if (disp_units_hdr == NULL) {
91 #if ENABLE_FEATURE_HUMAN_READABLE
92 disp_units_hdr = xasprintf("%s-blocks",
93 make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX)));
95 disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
98 printf("Filesystem %-15sUsed Available %s Mounted on\n",
99 disp_units_hdr, (opt & OPT_POSIX) ? "Capacity" : "Use%");
103 if (optind >= argc) {
104 mount_table = setmntent(bb_path_mtab_file, "r");
106 bb_perror_msg_and_die(bb_path_mtab_file);
111 const char *mount_point;
114 mount_entry = getmntent(mount_table);
116 endmntent(mount_table);
120 mount_point = *argv++;
123 mount_entry = find_mount_point(mount_point, bb_path_mtab_file);
125 bb_error_msg("%s: can't find mount point", mount_point);
127 status = EXIT_FAILURE;
132 device = mount_entry->mnt_fsname;
133 mount_point = mount_entry->mnt_dir;
135 if (statfs(mount_point, &s) != 0) {
136 bb_simple_perror_msg(mount_point);
140 if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
141 if (opt & OPT_INODE) {
142 s.f_blocks = s.f_files;
143 s.f_bavail = s.f_bfree = s.f_ffree;
149 blocks_used = s.f_blocks - s.f_bfree;
150 blocks_percent_used = 0;
151 if (blocks_used + s.f_bavail) {
152 blocks_percent_used = (blocks_used * 100ULL
153 + (blocks_used + s.f_bavail)/2
154 ) / (blocks_used + s.f_bavail);
157 /* GNU coreutils 6.10 skip certain mounts, try to be compatible. */
158 if (index_in_strings(device, ignored_mounts) != -1)
161 #ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
162 /* ... and also this is the only user of find_block_device */
163 if (strcmp(device, "/dev/root") == 0) {
164 /* Adjusts device to be the real root device,
165 * or leaves device alone if it can't find it */
166 device = find_block_device("/");
173 if (printf("\n%-20s" + 1, device) > 20)
174 printf("\n%-20s", "");
175 #if ENABLE_FEATURE_HUMAN_READABLE
177 make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
180 make_human_readable_str((s.f_blocks - s.f_bfree),
181 s.f_bsize, df_disp_hr));
183 printf("%9s %3u%% %s\n",
184 make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
185 blocks_percent_used, mount_point);
187 printf(" %9lu %9lu %9lu %3u%% %s\n",
188 kscale(s.f_blocks, s.f_bsize),
189 kscale(s.f_blocks - s.f_bfree, s.f_bsize),
190 kscale(s.f_bavail, s.f_bsize),
191 blocks_percent_used, mount_point);