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1/* vi: set sw=4 ts=4: */
2/*
3 * Mini df implementation for busybox
4 *
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6 * based on original code by (I think) Bruce Perens <bruce@pixar.com>.
7 *
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
9 */
10/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
11 *
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.
15 *
16 * Aug 28, 2008 Bernhard Reutner-Fischer
17 *
18 * Implement -P and -B; better coreutils compat; cleanup
19 */
20//config:config DF
21//config: bool "df"
22//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
32//config: This option enables -a, -i and -B.
33//config:
34//config: -a Show all filesystems
35//config: -i Inodes
36//config: -B <SIZE> Blocksize
37
38//applet:IF_DF(APPLET(df, BB_DIR_BIN, BB_SUID_DROP))
39
40//kbuild:lib-$(CONFIG_DF) += df.o
41
42/* BB_AUDIT SUSv3 _NOT_ compliant -- option -t missing. */
43/* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
44
45//usage:#define df_trivial_usage
46//usage: "[-Pk"
47//usage: IF_FEATURE_HUMAN_READABLE("mh")
48//usage: "T"
49//usage: IF_FEATURE_DF_FANCY("ai] [-B SIZE")
50//usage: "] [FILESYSTEM]..."
51//usage:#define df_full_usage "\n\n"
52//usage: "Print filesystem usage statistics\n"
53//usage: "\n -P POSIX output format"
54//usage: "\n -k 1024-byte blocks (default)"
55//usage: IF_FEATURE_HUMAN_READABLE(
56//usage: "\n -m 1M-byte blocks"
57//usage: "\n -h Human readable (e.g. 1K 243M 2G)"
58//usage: )
59//usage: "\n -T Print filesystem type"
60//usage: IF_FEATURE_DF_FANCY(
61//usage: "\n -a Show all filesystems"
62//usage: "\n -i Inodes"
63//usage: "\n -B SIZE Blocksize"
64//usage: )
65//usage:
66//usage:#define df_example_usage
67//usage: "$ df\n"
68//usage: "Filesystem 1K-blocks Used Available Use% Mounted on\n"
69//usage: "/dev/sda3 8690864 8553540 137324 98% /\n"
70//usage: "/dev/sda1 64216 36364 27852 57% /boot\n"
71//usage: "$ df /dev/sda3\n"
72//usage: "Filesystem 1K-blocks Used Available Use% Mounted on\n"
73//usage: "/dev/sda3 8690864 8553540 137324 98% /\n"
74//usage: "$ POSIXLY_CORRECT=sure df /dev/sda3\n"
75//usage: "Filesystem 512B-blocks Used Available Use% Mounted on\n"
76//usage: "/dev/sda3 17381728 17107080 274648 98% /\n"
77//usage: "$ POSIXLY_CORRECT=yep df -P /dev/sda3\n"
78//usage: "Filesystem 512-blocks Used Available Capacity Mounted on\n"
79//usage: "/dev/sda3 17381728 17107080 274648 98% /\n"
80
81#include <mntent.h>
82#include <sys/vfs.h>
83#include "libbb.h"
84#include "unicode.h"
85
86#if !ENABLE_FEATURE_HUMAN_READABLE
87static unsigned long kscale(unsigned long b, unsigned long bs)
88{
89 return (b * (unsigned long long) bs + 1024/2) / 1024;
90}
91#endif
92
93int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
94int df_main(int argc UNUSED_PARAM, char **argv)
95{
96 unsigned long blocks_used;
97 unsigned blocks_percent_used;
98 unsigned long df_disp_hr = 1024;
99 int status = EXIT_SUCCESS;
100 unsigned opt;
101 FILE *mount_table;
102 struct mntent *mount_entry;
103 struct statfs s;
104
105 enum {
106 OPT_KILO = (1 << 0),
107 OPT_POSIX = (1 << 1),
108 OPT_FSTYPE = (1 << 2),
109 OPT_ALL = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
110 OPT_INODE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
111 OPT_BSIZE = (1 << 5) * ENABLE_FEATURE_DF_FANCY,
112 OPT_HUMAN = (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
113 OPT_MEGA = (1 << (4 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
114 };
115 const char *disp_units_hdr = NULL;
116 char *chp;
117
118 init_unicode();
119
120#if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
121 opt_complementary = "k-mB:m-Bk:B-km";
122#elif ENABLE_FEATURE_HUMAN_READABLE
123 opt_complementary = "k-m:m-k";
124#endif
125 opt = getopt32(argv, "kPT"
126 IF_FEATURE_DF_FANCY("aiB:")
127 IF_FEATURE_HUMAN_READABLE("hm")
128 IF_FEATURE_DF_FANCY(, &chp));
129 if (opt & OPT_MEGA)
130 df_disp_hr = 1024*1024;
131
132 if (opt & OPT_BSIZE)
133 df_disp_hr = xatoul_range(chp, 1, ULONG_MAX); /* disallow 0 */
134
135 /* From the manpage of df from coreutils-6.10:
136 * Disk space is shown in 1K blocks by default, unless the environment
137 * variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
138 */
139 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
140 df_disp_hr = 512;
141
142 if (opt & OPT_HUMAN) {
143 df_disp_hr = 0;
144 disp_units_hdr = " Size";
145 }
146 if (opt & OPT_INODE)
147 disp_units_hdr = " Inodes";
148
149 if (disp_units_hdr == NULL) {
150#if ENABLE_FEATURE_HUMAN_READABLE
151 disp_units_hdr = xasprintf("%s-blocks",
152 /* print df_disp_hr, show no fractionals,
153 * use suffixes if OPT_POSIX is set in opt */
154 make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX))
155 );
156#else
157 disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
158#endif
159 }
160
161 printf("Filesystem %s%-15sUsed Available %s Mounted on\n",
162 (opt & OPT_FSTYPE) ? "Type " : "",
163 disp_units_hdr,
164 (opt & OPT_POSIX) ? "Capacity" : "Use%");
165
166 mount_table = NULL;
167 argv += optind;
168 if (!argv[0]) {
169 mount_table = setmntent(bb_path_mtab_file, "r");
170 if (!mount_table)
171 bb_perror_msg_and_die(bb_path_mtab_file);
172 }
173
174 while (1) {
175 const char *device;
176 const char *mount_point;
177 const char *fs_type;
178
179 if (mount_table) {
180 mount_entry = getmntent(mount_table);
181 if (!mount_entry) {
182 endmntent(mount_table);
183 break;
184 }
185 } else {
186 mount_point = *argv++;
187 if (!mount_point)
188 break;
189 mount_entry = find_mount_point(mount_point, 1);
190 if (!mount_entry) {
191 bb_error_msg("%s: can't find mount point", mount_point);
192 set_error:
193 status = EXIT_FAILURE;
194 continue;
195 }
196 }
197
198 device = mount_entry->mnt_fsname;
199 mount_point = mount_entry->mnt_dir;
200 fs_type = mount_entry->mnt_type;
201
202 if (statfs(mount_point, &s) != 0) {
203 bb_simple_perror_msg(mount_point);
204 goto set_error;
205 }
206
207 if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
208 if (opt & OPT_INODE) {
209 s.f_blocks = s.f_files;
210 s.f_bavail = s.f_bfree = s.f_ffree;
211 s.f_frsize = 1;
212
213 if (df_disp_hr)
214 df_disp_hr = 1;
215 }
216 blocks_used = s.f_blocks - s.f_bfree;
217 blocks_percent_used = 0;
218 if (blocks_used + s.f_bavail) {
219 blocks_percent_used = (blocks_used * 100ULL
220 + (blocks_used + s.f_bavail)/2
221 ) / (blocks_used + s.f_bavail);
222 }
223
224 /* GNU coreutils 6.10 skips certain mounts, try to be compatible. */
225 if (ENABLE_FEATURE_SKIP_ROOTFS && strcmp(device, "rootfs") == 0)
226 continue;
227
228#ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
229 if (strcmp(device, "/dev/root") == 0) {
230 /* Adjusts device to be the real root device,
231 * or leaves device alone if it can't find it */
232 device = find_block_device("/");
233 if (!device) {
234 goto set_error;
235 }
236 }
237#endif
238
239#if ENABLE_UNICODE_SUPPORT
240 {
241 uni_stat_t uni_stat;
242 char *uni_dev = unicode_conv_to_printable(&uni_stat, device);
243 if (uni_stat.unicode_width > 20 && !(opt & OPT_POSIX)) {
244 printf("%s\n%20s", uni_dev, "");
245 } else {
246 printf("%s%*s", uni_dev, 20 - (int)uni_stat.unicode_width, "");
247 }
248 free(uni_dev);
249 if (opt & OPT_FSTYPE) {
250 char *uni_type = unicode_conv_to_printable(&uni_stat, fs_type);
251 if (uni_stat.unicode_width > 10 && !(opt & OPT_POSIX))
252 printf(" %s\n%31s", uni_type, "");
253 else
254 printf(" %s%*s", uni_type, 10 - (int)uni_stat.unicode_width, "");
255 free(uni_type);
256 }
257 }
258#else
259 if (printf("\n%-20s" + 1, device) > 20 && !(opt & OPT_POSIX))
260 printf("\n%-20s", "");
261 if (opt & OPT_FSTYPE) {
262 if (printf(" %-10s", fs_type) > 11 && !(opt & OPT_POSIX))
263 printf("\n%-30s", "");
264 }
265#endif
266
267#if ENABLE_FEATURE_HUMAN_READABLE
268 printf(" %9s ",
269 /* f_blocks x f_frsize / df_disp_hr, show one fractional,
270 * use suffixes if df_disp_hr == 0 */
271 make_human_readable_str(s.f_blocks, s.f_frsize, df_disp_hr));
272
273 printf(" %9s " + 1,
274 /* EXPR x f_frsize / df_disp_hr, show one fractional,
275 * use suffixes if df_disp_hr == 0 */
276 make_human_readable_str((s.f_blocks - s.f_bfree),
277 s.f_frsize, df_disp_hr));
278
279 printf("%9s %3u%% %s\n",
280 /* f_bavail x f_frsize / df_disp_hr, show one fractional,
281 * use suffixes if df_disp_hr == 0 */
282 make_human_readable_str(s.f_bavail, s.f_frsize, df_disp_hr),
283 blocks_percent_used, mount_point);
284#else
285 printf(" %9lu %9lu %9lu %3u%% %s\n",
286 kscale(s.f_blocks, s.f_frsize),
287 kscale(s.f_blocks - s.f_bfree, s.f_frsize),
288 kscale(s.f_bavail, s.f_frsize),
289 blocks_percent_used, mount_point);
290#endif
291 }
292 }
293
294 return status;
295}
296
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