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 source tree.
10 /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
12 * Size reduction. Removed floating point dependency. Added error checking
13 * on output. Output stats on 0-sized filesystems if specifically listed on
14 * the command line. Properly round *-blocks, Used, and Available quantities.
16 * Aug 28, 2008 Bernhard Reutner-Fischer
18 * Implement -P and -B; better coreutils compat; cleanup
21 //config: bool "df (7.5 kb)"
24 //config: df reports the amount of disk space used and available
25 //config: on filesystems.
27 //config:config FEATURE_DF_FANCY
28 //config: bool "Enable -a, -i, -B"
30 //config: depends on DF
32 //config: -a Show all filesystems
34 //config: -B <SIZE> Blocksize
36 //applet:IF_DF(APPLET_NOEXEC(df, df, BB_DIR_BIN, BB_SUID_DROP, df))
38 //kbuild:lib-$(CONFIG_DF) += df.o
40 /* BB_AUDIT SUSv3 _NOT_ compliant -- option -t missing. */
41 /* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
43 //usage:#define df_trivial_usage
45 //usage: IF_FEATURE_HUMAN_READABLE("mh")
47 //usage: IF_FEATURE_DF_FANCY("ai] [-B SIZE")
48 //usage: "] [FILESYSTEM]..."
49 //usage:#define df_full_usage "\n\n"
50 //usage: "Print filesystem usage statistics\n"
51 //usage: "\n -P POSIX output format"
52 //usage: "\n -k 1024-byte blocks (default)"
53 //usage: IF_FEATURE_HUMAN_READABLE(
54 //usage: "\n -m 1M-byte blocks"
55 //usage: "\n -h Human readable (e.g. 1K 243M 2G)"
57 //usage: "\n -T Print filesystem type"
58 //usage: IF_FEATURE_DF_FANCY(
59 //usage: "\n -a Show all filesystems"
60 //usage: "\n -i Inodes"
61 //usage: "\n -B SIZE Blocksize"
64 //usage:#define df_example_usage
66 //usage: "Filesystem 1K-blocks Used Available Use% Mounted on\n"
67 //usage: "/dev/sda3 8690864 8553540 137324 98% /\n"
68 //usage: "/dev/sda1 64216 36364 27852 57% /boot\n"
69 //usage: "$ df /dev/sda3\n"
70 //usage: "Filesystem 1K-blocks Used Available Use% Mounted on\n"
71 //usage: "/dev/sda3 8690864 8553540 137324 98% /\n"
72 //usage: "$ POSIXLY_CORRECT=sure df /dev/sda3\n"
73 //usage: "Filesystem 512B-blocks Used Available Use% Mounted on\n"
74 //usage: "/dev/sda3 17381728 17107080 274648 98% /\n"
75 //usage: "$ POSIXLY_CORRECT=yep df -P /dev/sda3\n"
76 //usage: "Filesystem 512-blocks Used Available Capacity Mounted on\n"
77 //usage: "/dev/sda3 17381728 17107080 274648 98% /\n"
84 #if !ENABLE_FEATURE_HUMAN_READABLE
85 static unsigned long kscale(unsigned long b, unsigned long bs)
87 return (b * (unsigned long long) bs + 1024/2) / 1024;
91 int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
92 int df_main(int argc UNUSED_PARAM, char **argv)
94 unsigned long blocks_used;
95 unsigned blocks_percent_used;
96 unsigned long df_disp_hr = 1024;
97 int status = EXIT_SUCCESS;
100 struct mntent *mount_entry;
105 OPT_POSIX = (1 << 1),
106 OPT_FSTYPE = (1 << 2),
107 OPT_ALL = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
108 OPT_INODE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
109 OPT_BSIZE = (1 << 5) * ENABLE_FEATURE_DF_FANCY,
110 OPT_HUMAN = (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
111 OPT_MEGA = (1 << (4 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
113 const char *disp_units_hdr = NULL;
118 #if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
119 opt_complementary = "k-mB:m-Bk:B-km";
120 #elif ENABLE_FEATURE_HUMAN_READABLE
121 opt_complementary = "k-m:m-k";
123 opt = getopt32(argv, "kPT"
124 IF_FEATURE_DF_FANCY("aiB:")
125 IF_FEATURE_HUMAN_READABLE("hm")
126 IF_FEATURE_DF_FANCY(, &chp));
128 df_disp_hr = 1024*1024;
130 if (opt & OPT_BSIZE) {
131 /* GNU coreutils 8.25 accepts "-BMiB" form too */
133 for (i = 0; kmg_i_suffixes[i].suffix[0]; i++) {
134 if (strcmp(kmg_i_suffixes[i].suffix, chp) == 0) {
135 df_disp_hr = kmg_i_suffixes[i].mult;
139 /* Range used to disallow 0 */
140 df_disp_hr = xatoul_range_sfx(chp, 1, ULONG_MAX, kmg_i_suffixes);
144 /* From the manpage of df from coreutils-6.10:
145 * Disk space is shown in 1K blocks by default, unless the environment
146 * variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
148 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
151 if (opt & OPT_HUMAN) {
153 disp_units_hdr = " Size";
156 disp_units_hdr = " Inodes";
158 if (disp_units_hdr == NULL) {
159 #if ENABLE_FEATURE_HUMAN_READABLE
160 disp_units_hdr = xasprintf("%s-blocks",
161 /* print df_disp_hr, show no fractionals,
162 * use suffixes if OPT_POSIX is set in opt */
163 make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX))
166 disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
170 printf("Filesystem %s%-15sUsed Available %s Mounted on\n",
171 (opt & OPT_FSTYPE) ? "Type " : "",
173 (opt & OPT_POSIX) ? "Capacity" : "Use%");
178 mount_table = setmntent(bb_path_mtab_file, "r");
180 bb_perror_msg_and_die(bb_path_mtab_file);
185 const char *mount_point;
189 mount_entry = getmntent(mount_table);
191 endmntent(mount_table);
195 mount_point = *argv++;
198 mount_entry = find_mount_point(mount_point, 1);
200 bb_error_msg("%s: can't find mount point", mount_point);
202 status = EXIT_FAILURE;
207 device = mount_entry->mnt_fsname;
208 mount_point = mount_entry->mnt_dir;
209 fs_type = mount_entry->mnt_type;
211 if (statfs(mount_point, &s) != 0) {
212 bb_simple_perror_msg(mount_point);
215 /* Some uclibc versions were seen to lose f_frsize
216 * (kernel does return it, but then uclibc does not copy it)
219 s.f_frsize = s.f_bsize;
221 if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
222 if (opt & OPT_INODE) {
223 s.f_blocks = s.f_files;
224 s.f_bavail = s.f_bfree = s.f_ffree;
230 blocks_used = s.f_blocks - s.f_bfree;
231 blocks_percent_used = 0;
232 if (blocks_used + s.f_bavail) {
233 blocks_percent_used = (blocks_used * 100ULL
234 + (blocks_used + s.f_bavail)/2
235 ) / (blocks_used + s.f_bavail);
238 /* GNU coreutils 6.10 skips certain mounts, try to be compatible. */
239 if (ENABLE_FEATURE_SKIP_ROOTFS && strcmp(device, "rootfs") == 0)
242 #ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
243 if (strcmp(device, "/dev/root") == 0) {
244 /* Adjusts device to be the real root device,
245 * or leaves device alone if it can't find it */
246 device = find_block_device("/");
253 #if ENABLE_UNICODE_SUPPORT
256 char *uni_dev = unicode_conv_to_printable(&uni_stat, device);
257 if (uni_stat.unicode_width > 20 && !(opt & OPT_POSIX)) {
258 printf("%s\n%20s", uni_dev, "");
260 printf("%s%*s", uni_dev, 20 - (int)uni_stat.unicode_width, "");
263 if (opt & OPT_FSTYPE) {
264 char *uni_type = unicode_conv_to_printable(&uni_stat, fs_type);
265 if (uni_stat.unicode_width > 10 && !(opt & OPT_POSIX))
266 printf(" %s\n%31s", uni_type, "");
268 printf(" %s%*s", uni_type, 10 - (int)uni_stat.unicode_width, "");
273 if (printf("\n%-20s" + 1, device) > 20 && !(opt & OPT_POSIX))
274 printf("\n%-20s", "");
275 if (opt & OPT_FSTYPE) {
276 if (printf(" %-10s", fs_type) > 11 && !(opt & OPT_POSIX))
277 printf("\n%-30s", "");
281 #if ENABLE_FEATURE_HUMAN_READABLE
283 /* f_blocks x f_frsize / df_disp_hr, show one fractional,
284 * use suffixes if df_disp_hr == 0 */
285 make_human_readable_str(s.f_blocks, s.f_frsize, df_disp_hr));
288 /* EXPR x f_frsize / df_disp_hr, show one fractional,
289 * use suffixes if df_disp_hr == 0 */
290 make_human_readable_str((s.f_blocks - s.f_bfree),
291 s.f_frsize, df_disp_hr));
293 printf("%9s %3u%% %s\n",
294 /* f_bavail x f_frsize / df_disp_hr, show one fractional,
295 * use suffixes if df_disp_hr == 0 */
296 make_human_readable_str(s.f_bavail, s.f_frsize, df_disp_hr),
297 blocks_percent_used, mount_point);
299 printf(" %9lu %9lu %9lu %3u%% %s\n",
300 kscale(s.f_blocks, s.f_frsize),
301 kscale(s.f_blocks - s.f_bfree, s.f_frsize),
302 kscale(s.f_bavail, s.f_frsize),
303 blocks_percent_used, mount_point);