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.
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
25 //usage:#define df_trivial_usage
27 //usage: IF_FEATURE_HUMAN_READABLE("mh")
29 //usage: IF_FEATURE_DF_FANCY("ai] [-B SIZE")
30 //usage: "] [FILESYSTEM]..."
31 //usage:#define df_full_usage "\n\n"
32 //usage: "Print filesystem usage statistics\n"
33 //usage: "\n -P POSIX output format"
34 //usage: "\n -k 1024-byte blocks (default)"
35 //usage: IF_FEATURE_HUMAN_READABLE(
36 //usage: "\n -m 1M-byte blocks"
37 //usage: "\n -h Human readable (e.g. 1K 243M 2G)"
39 //usage: "\n -T Print filesystem type"
40 //usage: IF_FEATURE_DF_FANCY(
41 //usage: "\n -a Show all filesystems"
42 //usage: "\n -i Inodes"
43 //usage: "\n -B SIZE Blocksize"
46 //usage:#define df_example_usage
48 //usage: "Filesystem 1K-blocks Used Available Use% Mounted on\n"
49 //usage: "/dev/sda3 8690864 8553540 137324 98% /\n"
50 //usage: "/dev/sda1 64216 36364 27852 57% /boot\n"
51 //usage: "$ df /dev/sda3\n"
52 //usage: "Filesystem 1K-blocks Used Available Use% Mounted on\n"
53 //usage: "/dev/sda3 8690864 8553540 137324 98% /\n"
54 //usage: "$ POSIXLY_CORRECT=sure df /dev/sda3\n"
55 //usage: "Filesystem 512B-blocks Used Available Use% Mounted on\n"
56 //usage: "/dev/sda3 17381728 17107080 274648 98% /\n"
57 //usage: "$ POSIXLY_CORRECT=yep df -P /dev/sda3\n"
58 //usage: "Filesystem 512-blocks Used Available Capacity Mounted on\n"
59 //usage: "/dev/sda3 17381728 17107080 274648 98% /\n"
66 #if !ENABLE_FEATURE_HUMAN_READABLE
67 static unsigned long kscale(unsigned long b, unsigned long bs)
69 return (b * (unsigned long long) bs + 1024/2) / 1024;
73 int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
74 int df_main(int argc UNUSED_PARAM, char **argv)
76 unsigned long blocks_used;
77 unsigned blocks_percent_used;
78 unsigned long df_disp_hr = 1024;
79 int status = EXIT_SUCCESS;
82 struct mntent *mount_entry;
88 OPT_FSTYPE = (1 << 2),
89 OPT_ALL = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
90 OPT_INODE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
91 OPT_BSIZE = (1 << 5) * ENABLE_FEATURE_DF_FANCY,
92 OPT_HUMAN = (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
93 OPT_MEGA = (1 << (4 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
95 const char *disp_units_hdr = NULL;
100 #if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
101 opt_complementary = "k-mB:m-Bk:B-km";
102 #elif ENABLE_FEATURE_HUMAN_READABLE
103 opt_complementary = "k-m:m-k";
105 opt = getopt32(argv, "kPT"
106 IF_FEATURE_DF_FANCY("aiB:")
107 IF_FEATURE_HUMAN_READABLE("hm")
108 IF_FEATURE_DF_FANCY(, &chp));
110 df_disp_hr = 1024*1024;
113 df_disp_hr = xatoul_range(chp, 1, ULONG_MAX); /* disallow 0 */
115 /* From the manpage of df from coreutils-6.10:
116 * Disk space is shown in 1K blocks by default, unless the environment
117 * variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
119 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
122 if (opt & OPT_HUMAN) {
124 disp_units_hdr = " Size";
127 disp_units_hdr = " Inodes";
129 if (disp_units_hdr == NULL) {
130 #if ENABLE_FEATURE_HUMAN_READABLE
131 disp_units_hdr = xasprintf("%s-blocks",
132 /* print df_disp_hr, show no fractionals,
133 * use suffixes if OPT_POSIX is set in opt */
134 make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX))
137 disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
141 printf("Filesystem %s%-15sUsed Available %s Mounted on\n",
142 (opt & OPT_FSTYPE) ? "Type " : "",
144 (opt & OPT_POSIX) ? "Capacity" : "Use%");
149 mount_table = setmntent(bb_path_mtab_file, "r");
151 bb_perror_msg_and_die(bb_path_mtab_file);
156 const char *mount_point;
160 mount_entry = getmntent(mount_table);
162 endmntent(mount_table);
166 mount_point = *argv++;
169 mount_entry = find_mount_point(mount_point, 1);
171 bb_error_msg("%s: can't find mount point", mount_point);
173 status = EXIT_FAILURE;
178 device = mount_entry->mnt_fsname;
179 mount_point = mount_entry->mnt_dir;
180 fs_type = mount_entry->mnt_type;
182 if (statfs(mount_point, &s) != 0) {
183 bb_simple_perror_msg(mount_point);
187 if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
188 if (opt & OPT_INODE) {
189 s.f_blocks = s.f_files;
190 s.f_bavail = s.f_bfree = s.f_ffree;
196 blocks_used = s.f_blocks - s.f_bfree;
197 blocks_percent_used = 0;
198 if (blocks_used + s.f_bavail) {
199 blocks_percent_used = (blocks_used * 100ULL
200 + (blocks_used + s.f_bavail)/2
201 ) / (blocks_used + s.f_bavail);
204 /* GNU coreutils 6.10 skips certain mounts, try to be compatible. */
205 if (ENABLE_FEATURE_SKIP_ROOTFS && strcmp(device, "rootfs") == 0)
208 #ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
209 if (strcmp(device, "/dev/root") == 0) {
210 /* Adjusts device to be the real root device,
211 * or leaves device alone if it can't find it */
212 device = find_block_device("/");
219 #if ENABLE_UNICODE_SUPPORT
222 char *uni_dev = unicode_conv_to_printable(&uni_stat, device);
223 if (uni_stat.unicode_width > 20 && !(opt & OPT_POSIX)) {
224 printf("%s\n%20s", uni_dev, "");
226 printf("%s%*s", uni_dev, 20 - (int)uni_stat.unicode_width, "");
229 if (opt & OPT_FSTYPE) {
230 char *uni_type = unicode_conv_to_printable(&uni_stat, fs_type);
231 if (uni_stat.unicode_width > 10 && !(opt & OPT_POSIX))
232 printf(" %s\n%31s", uni_type, "");
234 printf(" %s%*s", uni_type, 10 - (int)uni_stat.unicode_width, "");
239 if (printf("\n%-20s" + 1, device) > 20 && !(opt & OPT_POSIX))
240 printf("\n%-20s", "");
241 if (opt & OPT_FSTYPE) {
242 if (printf(" %-10s", fs_type) > 11 && !(opt & OPT_POSIX))
243 printf("\n%-30s", "");
247 #if ENABLE_FEATURE_HUMAN_READABLE
249 /* f_blocks x f_bsize / df_disp_hr, show one fractional,
250 * use suffixes if df_disp_hr == 0 */
251 make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
254 /* EXPR x f_bsize / df_disp_hr, show one fractional,
255 * use suffixes if df_disp_hr == 0 */
256 make_human_readable_str((s.f_blocks - s.f_bfree),
257 s.f_bsize, df_disp_hr));
259 printf("%9s %3u%% %s\n",
260 /* f_bavail x f_bsize / df_disp_hr, show one fractional,
261 * use suffixes if df_disp_hr == 0 */
262 make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
263 blocks_percent_used, mount_point);
265 printf(" %9lu %9lu %9lu %3u%% %s\n",
266 kscale(s.f_blocks, s.f_bsize),
267 kscale(s.f_blocks - s.f_bfree, s.f_bsize),
268 kscale(s.f_bavail, s.f_bsize),
269 blocks_percent_used, mount_point);