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Erik Andersene49d5ec2000-02-08 19:58:47 +00001/* vi: set sw=4 ts=4: */
Eric Andersenc4996011999-10-20 22:08:37 +00002/*
3 * Mini df implementation for busybox
4 *
Eric Andersenc7bda1c2004-03-15 08:29:22 +00005 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
Eric Andersenc4996011999-10-20 22:08:37 +00006 * based on original code by (I think) Bruce Perens <bruce@pixar.com>.
7 *
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +02008 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
Eric Andersenc4996011999-10-20 22:08:37 +00009 */
Manuel Novoa III cad53642003-03-19 09:13:01 +000010/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
11 *
12 * Size reduction. Removed floating point dependency. Added error checking
Eric Andersenaff114c2004-04-14 17:51:38 +000013 * on output. Output stats on 0-sized filesystems if specifically listed on
Manuel Novoa III cad53642003-03-19 09:13:01 +000014 * the command line. Properly round *-blocks, Used, and Available quantities.
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +000015 *
16 * Aug 28, 2008 Bernhard Reutner-Fischer
17 *
18 * Implement -P and -B; better coreutils compat; cleanup
Manuel Novoa III cad53642003-03-19 09:13:01 +000019 */
Denys Vlasenkoaf3f4202016-11-23 14:46:56 +010020//config:config DF
Denys Vlasenko4eed2c62017-07-18 22:01:24 +020021//config: bool "df (7.5 kb)"
Denys Vlasenkoaf3f4202016-11-23 14:46:56 +010022//config: default y
23//config: help
24//config: df reports the amount of disk space used and available
25//config: on filesystems.
26//config:
27//config:config FEATURE_DF_FANCY
28//config: bool "Enable -a, -i, -B"
29//config: default y
30//config: depends on DF
31//config: help
Denys Vlasenkof5604222017-01-10 14:58:54 +010032//config: -a Show all filesystems
33//config: -i Inodes
34//config: -B <SIZE> Blocksize
Denys Vlasenkoaf3f4202016-11-23 14:46:56 +010035
36//applet:IF_DF(APPLET(df, BB_DIR_BIN, BB_SUID_DROP))
37
38//kbuild:lib-$(CONFIG_DF) += df.o
39
40/* BB_AUDIT SUSv3 _NOT_ compliant -- option -t missing. */
41/* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
Manuel Novoa III cad53642003-03-19 09:13:01 +000042
Pere Orga34425382011-03-31 14:43:25 +020043//usage:#define df_trivial_usage
44//usage: "[-Pk"
45//usage: IF_FEATURE_HUMAN_READABLE("mh")
Ari Sundholmd0cdaca2014-09-17 20:53:58 +020046//usage: "T"
Pere Orga34425382011-03-31 14:43:25 +020047//usage: IF_FEATURE_DF_FANCY("ai] [-B SIZE")
48//usage: "] [FILESYSTEM]..."
49//usage:#define df_full_usage "\n\n"
50//usage: "Print filesystem usage statistics\n"
Pere Orga34425382011-03-31 14:43:25 +020051//usage: "\n -P POSIX output format"
52//usage: "\n -k 1024-byte blocks (default)"
53//usage: IF_FEATURE_HUMAN_READABLE(
54//usage: "\n -m 1M-byte blocks"
55//usage: "\n -h Human readable (e.g. 1K 243M 2G)"
56//usage: )
Ari Sundholmd0cdaca2014-09-17 20:53:58 +020057//usage: "\n -T Print filesystem type"
Pere Orga34425382011-03-31 14:43:25 +020058//usage: IF_FEATURE_DF_FANCY(
59//usage: "\n -a Show all filesystems"
60//usage: "\n -i Inodes"
61//usage: "\n -B SIZE Blocksize"
62//usage: )
63//usage:
64//usage:#define df_example_usage
65//usage: "$ df\n"
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"
78
Eric Andersencc8ed391999-10-05 16:24:54 +000079#include <mntent.h>
Eric Andersencc8ed391999-10-05 16:24:54 +000080#include <sys/vfs.h>
Denis Vlasenkob6adbf12007-05-26 19:00:18 +000081#include "libbb.h"
Denys Vlasenko200d5222009-09-22 15:34:28 +020082#include "unicode.h"
Eric Andersencc8ed391999-10-05 16:24:54 +000083
Denis Vlasenkoe3241842007-08-13 10:36:25 +000084#if !ENABLE_FEATURE_HUMAN_READABLE
Denis Vlasenko08294db2007-08-13 12:27:49 +000085static unsigned long kscale(unsigned long b, unsigned long bs)
Eric Andersencc8ed391999-10-05 16:24:54 +000086{
Denis Vlasenko08294db2007-08-13 12:27:49 +000087 return (b * (unsigned long long) bs + 1024/2) / 1024;
Eric Andersencc8ed391999-10-05 16:24:54 +000088}
Manuel Novoa III cad53642003-03-19 09:13:01 +000089#endif
Eric Andersencc8ed391999-10-05 16:24:54 +000090
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +000091int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Denys Vlasenkoe992bae2009-11-28 15:18:53 +010092int df_main(int argc UNUSED_PARAM, char **argv)
Eric Andersenc4996011999-10-20 22:08:37 +000093{
Denis Vlasenko08294db2007-08-13 12:27:49 +000094 unsigned long blocks_used;
95 unsigned blocks_percent_used;
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +000096 unsigned long df_disp_hr = 1024;
Matt Kraai92ed8a32000-12-06 15:55:23 +000097 int status = EXIT_SUCCESS;
Denis Vlasenko67b23e62006-10-03 21:00:06 +000098 unsigned opt;
Manuel Novoa III cad53642003-03-19 09:13:01 +000099 FILE *mount_table;
100 struct mntent *mount_entry;
101 struct statfs s;
Richard June6d0921c2001-01-22 22:35:38 +0000102
Denis Vlasenkof430cdb2007-11-15 07:02:55 +0000103 enum {
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000104 OPT_KILO = (1 << 0),
105 OPT_POSIX = (1 << 1),
Ari Sundholmfbdc1672014-09-18 15:41:57 +0300106 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,
Denis Vlasenkof430cdb2007-11-15 07:02:55 +0000112 };
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000113 const char *disp_units_hdr = NULL;
114 char *chp;
Denis Vlasenkof430cdb2007-11-15 07:02:55 +0000115
Denys Vlasenko28055022010-01-04 20:49:58 +0100116 init_unicode();
Denys Vlasenko200d5222009-09-22 15:34:28 +0200117
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000118#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";
122#endif
Ari Sundholmfbdc1672014-09-18 15:41:57 +0300123 opt = getopt32(argv, "kPT"
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000124 IF_FEATURE_DF_FANCY("aiB:")
125 IF_FEATURE_HUMAN_READABLE("hm")
126 IF_FEATURE_DF_FANCY(, &chp));
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000127 if (opt & OPT_MEGA)
128 df_disp_hr = 1024*1024;
129
Denys Vlasenkoe184a882016-12-12 19:56:31 +0100130 if (opt & OPT_BSIZE) {
131 /* GNU coreutils 8.25 accepts "-BMiB" form too */
132 int i;
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;
136 goto got_it;
137 }
138 }
139 /* Range used to disallow 0 */
140 df_disp_hr = xatoul_range_sfx(chp, 1, ULONG_MAX, kmg_i_suffixes);
141 got_it: ;
142 }
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000143
144 /* From the manpage of df from coreutils-6.10:
Denys Vlasenko6830ade2013-01-15 13:58:01 +0100145 * 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.
Denys Vlasenko69675782013-01-14 01:34:48 +0100147 */
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000148 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
149 df_disp_hr = 512;
150
151 if (opt & OPT_HUMAN) {
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000152 df_disp_hr = 0;
153 disp_units_hdr = " Size";
Eric Andersen8876fb22003-06-20 09:01:58 +0000154 }
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000155 if (opt & OPT_INODE)
Denis Vlasenkof430cdb2007-11-15 07:02:55 +0000156 disp_units_hdr = " Inodes";
Matt Kraai92ed8a32000-12-06 15:55:23 +0000157
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000158 if (disp_units_hdr == NULL) {
159#if ENABLE_FEATURE_HUMAN_READABLE
160 disp_units_hdr = xasprintf("%s-blocks",
Denys Vlasenko0bf44d02009-10-13 01:25:09 +0200161 /* 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))
164 );
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000165#else
Denis Vlasenkoe0bcba12008-09-25 10:41:15 +0000166 disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000167#endif
168 }
Ari Sundholmd0cdaca2014-09-17 20:53:58 +0200169
170 printf("Filesystem %s%-15sUsed Available %s Mounted on\n",
171 (opt & OPT_FSTYPE) ? "Type " : "",
172 disp_units_hdr,
173 (opt & OPT_POSIX) ? "Capacity" : "Use%");
Eric Andersenc4996011999-10-20 22:08:37 +0000174
Manuel Novoa III cad53642003-03-19 09:13:01 +0000175 mount_table = NULL;
176 argv += optind;
Denys Vlasenkoe992bae2009-11-28 15:18:53 +0100177 if (!argv[0]) {
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000178 mount_table = setmntent(bb_path_mtab_file, "r");
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000179 if (!mount_table)
Manuel Novoa III cad53642003-03-19 09:13:01 +0000180 bb_perror_msg_and_die(bb_path_mtab_file);
Eric Andersenc4996011999-10-20 22:08:37 +0000181 }
182
Denis Vlasenko08294db2007-08-13 12:27:49 +0000183 while (1) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000184 const char *device;
185 const char *mount_point;
Ari Sundholmd0cdaca2014-09-17 20:53:58 +0200186 const char *fs_type;
Manuel Novoa III cad53642003-03-19 09:13:01 +0000187
188 if (mount_table) {
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000189 mount_entry = getmntent(mount_table);
190 if (!mount_entry) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000191 endmntent(mount_table);
192 break;
193 }
194 } else {
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000195 mount_point = *argv++;
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000196 if (!mount_point)
Manuel Novoa III cad53642003-03-19 09:13:01 +0000197 break;
Denys Vlasenko6ae64262009-07-18 16:22:26 +0200198 mount_entry = find_mount_point(mount_point, 1);
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000199 if (!mount_entry) {
200 bb_error_msg("%s: can't find mount point", mount_point);
Denis Vlasenko0354aba2009-03-19 03:56:20 +0000201 set_error:
Manuel Novoa III cad53642003-03-19 09:13:01 +0000202 status = EXIT_FAILURE;
203 continue;
204 }
205 }
206
207 device = mount_entry->mnt_fsname;
208 mount_point = mount_entry->mnt_dir;
Ari Sundholmd0cdaca2014-09-17 20:53:58 +0200209 fs_type = mount_entry->mnt_type;
Manuel Novoa III cad53642003-03-19 09:13:01 +0000210
211 if (statfs(mount_point, &s) != 0) {
Denis Vlasenko0c97c9d2007-10-01 11:58:38 +0000212 bb_simple_perror_msg(mount_point);
Denis Vlasenko0354aba2009-03-19 03:56:20 +0000213 goto set_error;
Manuel Novoa III cad53642003-03-19 09:13:01 +0000214 }
Denys Vlasenkoe184a882016-12-12 19:56:31 +0100215 /* Some uclibc versions were seen to lose f_frsize
216 * (kernel does return it, but then uclibc does not copy it)
217 */
218 if (s.f_frsize == 0)
219 s.f_frsize = s.f_bsize;
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000220
Denis Vlasenko6d38dc32007-11-15 09:02:12 +0000221 if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
Denis Vlasenkof430cdb2007-11-15 07:02:55 +0000222 if (opt & OPT_INODE) {
223 s.f_blocks = s.f_files;
224 s.f_bavail = s.f_bfree = s.f_ffree;
Natanael Copa8f4faa12016-06-23 10:42:40 +0200225 s.f_frsize = 1;
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000226
Denis Vlasenkof430cdb2007-11-15 07:02:55 +0000227 if (df_disp_hr)
228 df_disp_hr = 1;
Denis Vlasenkof430cdb2007-11-15 07:02:55 +0000229 }
Manuel Novoa III cad53642003-03-19 09:13:01 +0000230 blocks_used = s.f_blocks - s.f_bfree;
231 blocks_percent_used = 0;
232 if (blocks_used + s.f_bavail) {
Denis Vlasenko08294db2007-08-13 12:27:49 +0000233 blocks_percent_used = (blocks_used * 100ULL
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000234 + (blocks_used + s.f_bavail)/2
235 ) / (blocks_used + s.f_bavail);
Manuel Novoa III cad53642003-03-19 09:13:01 +0000236 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000237
Denys Vlasenko09e63bb2009-07-05 04:50:36 +0200238 /* GNU coreutils 6.10 skips certain mounts, try to be compatible. */
Lauri Kasanen55ae0e92011-01-31 06:27:35 +0100239 if (ENABLE_FEATURE_SKIP_ROOTFS && strcmp(device, "rootfs") == 0)
Eric Andersen9d7f0f02003-06-20 09:36:49 +0000240 continue;
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000241
Denis Vlasenko6d38dc32007-11-15 09:02:12 +0000242#ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
Denis Vlasenkof430cdb2007-11-15 07:02:55 +0000243 if (strcmp(device, "/dev/root") == 0) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000244 /* Adjusts device to be the real root device,
Denys Vlasenkoa7329662009-12-05 04:25:19 +0100245 * or leaves device alone if it can't find it */
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000246 device = find_block_device("/");
247 if (!device) {
Denis Vlasenko0354aba2009-03-19 03:56:20 +0000248 goto set_error;
Manuel Novoa III cad53642003-03-19 09:13:01 +0000249 }
250 }
Denis Vlasenko6d38dc32007-11-15 09:02:12 +0000251#endif
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000252
Denys Vlasenko19158a82010-03-26 14:06:56 +0100253#if ENABLE_UNICODE_SUPPORT
Denys Vlasenkoe17764c2010-01-30 23:16:21 +0100254 {
255 uni_stat_t uni_stat;
256 char *uni_dev = unicode_conv_to_printable(&uni_stat, device);
Ralf Friedl00103d32011-08-09 04:49:27 +0200257 if (uni_stat.unicode_width > 20 && !(opt & OPT_POSIX)) {
Denys Vlasenkoe17764c2010-01-30 23:16:21 +0100258 printf("%s\n%20s", uni_dev, "");
259 } else {
260 printf("%s%*s", uni_dev, 20 - (int)uni_stat.unicode_width, "");
261 }
262 free(uni_dev);
Ari Sundholmd0cdaca2014-09-17 20:53:58 +0200263 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, "");
267 else
268 printf(" %s%*s", uni_type, 10 - (int)uni_stat.unicode_width, "");
269 free(uni_type);
270 }
Denys Vlasenko200d5222009-09-22 15:34:28 +0200271 }
272#else
Ralf Friedl00103d32011-08-09 04:49:27 +0200273 if (printf("\n%-20s" + 1, device) > 20 && !(opt & OPT_POSIX))
Denys Vlasenko69675782013-01-14 01:34:48 +0100274 printf("\n%-20s", "");
Ari Sundholmd0cdaca2014-09-17 20:53:58 +0200275 if (opt & OPT_FSTYPE) {
276 if (printf(" %-10s", fs_type) > 11 && !(opt & OPT_POSIX))
277 printf("\n%-30s", "");
278 }
Denys Vlasenko200d5222009-09-22 15:34:28 +0200279#endif
280
Denis Vlasenkoe3241842007-08-13 10:36:25 +0000281#if ENABLE_FEATURE_HUMAN_READABLE
Denis Vlasenko08294db2007-08-13 12:27:49 +0000282 printf(" %9s ",
Natanael Copa8f4faa12016-06-23 10:42:40 +0200283 /* f_blocks x f_frsize / df_disp_hr, show one fractional,
Denys Vlasenko0bf44d02009-10-13 01:25:09 +0200284 * use suffixes if df_disp_hr == 0 */
Natanael Copa8f4faa12016-06-23 10:42:40 +0200285 make_human_readable_str(s.f_blocks, s.f_frsize, df_disp_hr));
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000286
Denis Vlasenko08294db2007-08-13 12:27:49 +0000287 printf(" %9s " + 1,
Natanael Copa8f4faa12016-06-23 10:42:40 +0200288 /* EXPR x f_frsize / df_disp_hr, show one fractional,
Denys Vlasenko0bf44d02009-10-13 01:25:09 +0200289 * use suffixes if df_disp_hr == 0 */
Denis Vlasenko08294db2007-08-13 12:27:49 +0000290 make_human_readable_str((s.f_blocks - s.f_bfree),
Natanael Copa8f4faa12016-06-23 10:42:40 +0200291 s.f_frsize, df_disp_hr));
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000292
Denis Vlasenko08294db2007-08-13 12:27:49 +0000293 printf("%9s %3u%% %s\n",
Natanael Copa8f4faa12016-06-23 10:42:40 +0200294 /* f_bavail x f_frsize / df_disp_hr, show one fractional,
Denys Vlasenko0bf44d02009-10-13 01:25:09 +0200295 * use suffixes if df_disp_hr == 0 */
Natanael Copa8f4faa12016-06-23 10:42:40 +0200296 make_human_readable_str(s.f_bavail, s.f_frsize, df_disp_hr),
Denys Vlasenko0bf44d02009-10-13 01:25:09 +0200297 blocks_percent_used, mount_point);
Manuel Novoa III cad53642003-03-19 09:13:01 +0000298#else
Denis Vlasenko08294db2007-08-13 12:27:49 +0000299 printf(" %9lu %9lu %9lu %3u%% %s\n",
Natanael Copa8f4faa12016-06-23 10:42:40 +0200300 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),
Denys Vlasenko0bf44d02009-10-13 01:25:09 +0200303 blocks_percent_used, mount_point);
Manuel Novoa III cad53642003-03-19 09:13:01 +0000304#endif
305 }
Denis Vlasenko08294db2007-08-13 12:27:49 +0000306 }
Manuel Novoa III cad53642003-03-19 09:13:01 +0000307
Denis Vlasenkod66aa3c2008-08-28 22:42:52 +0000308 return status;
Eric Andersenc6cb79d1999-10-13 18:01:10 +0000309}