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"
80 #include <sys/statvfs.h>
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 df_disp_hr = 1024;
95 int status = EXIT_SUCCESS;
98 struct mntent *mount_entry;
103 OPT_POSIX = (1 << 1),
104 OPT_FSTYPE = (1 << 2),
105 OPT_ALL = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
106 OPT_INODE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
107 OPT_BSIZE = (1 << 5) * ENABLE_FEATURE_DF_FANCY,
108 OPT_HUMAN = (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
109 OPT_MEGA = (1 << (4 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
111 const char *disp_units_hdr = NULL;
116 opt = getopt32(argv, "^"
118 IF_FEATURE_DF_FANCY("aiB:")
119 IF_FEATURE_HUMAN_READABLE("hm")
121 #if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
123 #elif ENABLE_FEATURE_HUMAN_READABLE
126 IF_FEATURE_DF_FANCY(, &chp)
129 df_disp_hr = 1024*1024;
131 if (opt & OPT_BSIZE) {
132 /* GNU coreutils 8.25 accepts "-BMiB" form too */
134 for (i = 0; kmg_i_suffixes[i].suffix[0]; i++) {
135 if (strcmp(kmg_i_suffixes[i].suffix, chp) == 0) {
136 df_disp_hr = kmg_i_suffixes[i].mult;
140 /* Range used to disallow 0 */
141 df_disp_hr = xatoul_range_sfx(chp, 1, ULONG_MAX, kmg_i_suffixes);
145 /* From the manpage of df from coreutils-6.10:
146 * Disk space is shown in 1K blocks by default, unless the environment
147 * variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
149 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
152 if (opt & OPT_HUMAN) {
154 disp_units_hdr = " Size";
157 disp_units_hdr = " Inodes";
159 if (disp_units_hdr == NULL) {
160 #if ENABLE_FEATURE_HUMAN_READABLE
161 disp_units_hdr = xasprintf("%s-blocks",
162 /* print df_disp_hr, show no fractionals,
163 * use suffixes if OPT_POSIX is set in opt */
164 make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX))
167 disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
171 printf("Filesystem %s%-15sUsed Available %s Mounted on\n",
172 (opt & OPT_FSTYPE) ? "Type " : "",
174 (opt & OPT_POSIX) ? "Capacity" : "Use%");
179 mount_table = setmntent(bb_path_mtab_file, "r");
181 bb_perror_msg_and_die(bb_path_mtab_file);
186 const char *mount_point;
190 mount_entry = getmntent(mount_table);
192 endmntent(mount_table);
196 mount_point = *argv++;
199 mount_entry = find_mount_point(mount_point, 1);
201 bb_error_msg("%s: can't find mount point", mount_point);
203 status = EXIT_FAILURE;
208 device = mount_entry->mnt_fsname;
210 /* GNU coreutils 6.10 skips certain mounts, try to be compatible */
211 if (ENABLE_FEATURE_SKIP_ROOTFS && strcmp(device, "rootfs") == 0)
214 mount_point = mount_entry->mnt_dir;
215 fs_type = mount_entry->mnt_type;
217 if (statvfs(mount_point, &s) != 0) {
218 bb_simple_perror_msg(mount_point);
221 /* Some uclibc versions were seen to lose f_frsize
222 * (kernel does return it, but then uclibc does not copy it)
225 s.f_frsize = s.f_bsize;
227 if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
228 unsigned long long blocks_used;
229 unsigned long long blocks_total;
230 unsigned blocks_percent_used;
232 if (opt & OPT_INODE) {
233 s.f_blocks = s.f_files;
234 s.f_bavail = s.f_bfree = s.f_ffree;
239 blocks_used = s.f_blocks - s.f_bfree;
240 blocks_total = blocks_used + s.f_bavail;
241 blocks_percent_used = blocks_total; /* 0% if blocks_total == 0, else... */
242 if (blocks_total != 0) {
243 /* Downscale sizes for narrower division */
245 while (blocks_total >= INT_MAX / 101) {
249 u = (unsigned)blocks_used * 100u + (unsigned)blocks_total / 2;
250 blocks_percent_used = u / (unsigned)blocks_total;
253 #ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
254 if (strcmp(device, "/dev/root") == 0) {
255 /* Adjusts device to be the real root device,
256 * or leaves device alone if it can't find it */
257 device = find_block_device("/");
264 #if ENABLE_UNICODE_SUPPORT
267 char *uni_dev = unicode_conv_to_printable(&uni_stat, device);
268 if (uni_stat.unicode_width > 20 && !(opt & OPT_POSIX)) {
269 printf("%s\n%20s", uni_dev, "");
271 printf("%s%*s", uni_dev, 20 - (int)uni_stat.unicode_width, "");
274 if (opt & OPT_FSTYPE) {
275 char *uni_type = unicode_conv_to_printable(&uni_stat, fs_type);
276 if (uni_stat.unicode_width > 10 && !(opt & OPT_POSIX))
277 printf(" %s\n%31s", uni_type, "");
279 printf(" %s%*s", uni_type, 10 - (int)uni_stat.unicode_width, "");
284 if (printf("\n%-20s" + 1, device) > 20 && !(opt & OPT_POSIX))
285 printf("\n%-20s", "");
286 if (opt & OPT_FSTYPE) {
287 if (printf(" %-10s", fs_type) > 11 && !(opt & OPT_POSIX))
288 printf("\n%-30s", "");
292 #if ENABLE_FEATURE_HUMAN_READABLE
294 /* f_blocks x f_frsize / df_disp_hr, show one fractional,
295 * use suffixes if df_disp_hr == 0 */
296 make_human_readable_str(s.f_blocks, s.f_frsize, df_disp_hr));
299 /* EXPR x f_frsize / df_disp_hr, show one fractional,
300 * use suffixes if df_disp_hr == 0 */
301 make_human_readable_str((s.f_blocks - s.f_bfree),
302 s.f_frsize, df_disp_hr));
304 printf("%9s %3u%% %s\n",
305 /* f_bavail x f_frsize / df_disp_hr, show one fractional,
306 * use suffixes if df_disp_hr == 0 */
307 make_human_readable_str(s.f_bavail, s.f_frsize, df_disp_hr),
308 blocks_percent_used, mount_point);
310 printf(" %9lu %9lu %9lu %3u%% %s\n",
311 kscale(s.f_blocks, s.f_frsize),
312 kscale(s.f_blocks - s.f_bfree, s.f_frsize),
313 kscale(s.f_bavail, s.f_frsize),
314 blocks_percent_used, mount_point);