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
kscale(unsigned long b,unsigned long bs)87 static unsigned long kscale(unsigned long b, unsigned long bs)
88 {
89 return (b * (unsigned long long) bs + 1024/2) / 1024;
90 }
91 #endif
92
93 int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
df_main(int argc UNUSED_PARAM,char ** argv)94 int 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 /* GNU coreutils 8.25 accepts "-BMiB" form too */
134 int i;
135 for (i = 0; kmg_i_suffixes[i].suffix[0]; i++) {
136 if (strcmp(kmg_i_suffixes[i].suffix, chp) == 0) {
137 df_disp_hr = kmg_i_suffixes[i].mult;
138 goto got_it;
139 }
140 }
141 /* Range used to disallow 0 */
142 df_disp_hr = xatoul_range_sfx(chp, 1, ULONG_MAX, kmg_i_suffixes);
143 got_it: ;
144 }
145
146 /* From the manpage of df from coreutils-6.10:
147 * Disk space is shown in 1K blocks by default, unless the environment
148 * variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
149 */
150 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
151 df_disp_hr = 512;
152
153 if (opt & OPT_HUMAN) {
154 df_disp_hr = 0;
155 disp_units_hdr = " Size";
156 }
157 if (opt & OPT_INODE)
158 disp_units_hdr = " Inodes";
159
160 if (disp_units_hdr == NULL) {
161 #if ENABLE_FEATURE_HUMAN_READABLE
162 disp_units_hdr = xasprintf("%s-blocks",
163 /* print df_disp_hr, show no fractionals,
164 * use suffixes if OPT_POSIX is set in opt */
165 make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX))
166 );
167 #else
168 disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
169 #endif
170 }
171
172 printf("Filesystem %s%-15sUsed Available %s Mounted on\n",
173 (opt & OPT_FSTYPE) ? "Type " : "",
174 disp_units_hdr,
175 (opt & OPT_POSIX) ? "Capacity" : "Use%");
176
177 mount_table = NULL;
178 argv += optind;
179 if (!argv[0]) {
180 mount_table = setmntent(bb_path_mtab_file, "r");
181 if (!mount_table)
182 bb_perror_msg_and_die(bb_path_mtab_file);
183 }
184
185 while (1) {
186 const char *device;
187 const char *mount_point;
188 const char *fs_type;
189
190 if (mount_table) {
191 mount_entry = getmntent(mount_table);
192 if (!mount_entry) {
193 endmntent(mount_table);
194 break;
195 }
196 } else {
197 mount_point = *argv++;
198 if (!mount_point)
199 break;
200 mount_entry = find_mount_point(mount_point, 1);
201 if (!mount_entry) {
202 bb_error_msg("%s: can't find mount point", mount_point);
203 set_error:
204 status = EXIT_FAILURE;
205 continue;
206 }
207 }
208
209 device = mount_entry->mnt_fsname;
210 mount_point = mount_entry->mnt_dir;
211 fs_type = mount_entry->mnt_type;
212
213 if (statfs(mount_point, &s) != 0) {
214 bb_simple_perror_msg(mount_point);
215 goto set_error;
216 }
217 /* Some uclibc versions were seen to lose f_frsize
218 * (kernel does return it, but then uclibc does not copy it)
219 */
220 if (s.f_frsize == 0)
221 s.f_frsize = s.f_bsize;
222
223 if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
224 if (opt & OPT_INODE) {
225 s.f_blocks = s.f_files;
226 s.f_bavail = s.f_bfree = s.f_ffree;
227 s.f_frsize = 1;
228
229 if (df_disp_hr)
230 df_disp_hr = 1;
231 }
232 blocks_used = s.f_blocks - s.f_bfree;
233 blocks_percent_used = 0;
234 if (blocks_used + s.f_bavail) {
235 blocks_percent_used = (blocks_used * 100ULL
236 + (blocks_used + s.f_bavail)/2
237 ) / (blocks_used + s.f_bavail);
238 }
239
240 /* GNU coreutils 6.10 skips certain mounts, try to be compatible. */
241 if (ENABLE_FEATURE_SKIP_ROOTFS && strcmp(device, "rootfs") == 0)
242 continue;
243
244 #ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
245 if (strcmp(device, "/dev/root") == 0) {
246 /* Adjusts device to be the real root device,
247 * or leaves device alone if it can't find it */
248 device = find_block_device("/");
249 if (!device) {
250 goto set_error;
251 }
252 }
253 #endif
254
255 #if ENABLE_UNICODE_SUPPORT
256 {
257 uni_stat_t uni_stat;
258 char *uni_dev = unicode_conv_to_printable(&uni_stat, device);
259 if (uni_stat.unicode_width > 20 && !(opt & OPT_POSIX)) {
260 printf("%s\n%20s", uni_dev, "");
261 } else {
262 printf("%s%*s", uni_dev, 20 - (int)uni_stat.unicode_width, "");
263 }
264 free(uni_dev);
265 if (opt & OPT_FSTYPE) {
266 char *uni_type = unicode_conv_to_printable(&uni_stat, fs_type);
267 if (uni_stat.unicode_width > 10 && !(opt & OPT_POSIX))
268 printf(" %s\n%31s", uni_type, "");
269 else
270 printf(" %s%*s", uni_type, 10 - (int)uni_stat.unicode_width, "");
271 free(uni_type);
272 }
273 }
274 #else
275 if (printf("\n%-20s" + 1, device) > 20 && !(opt & OPT_POSIX))
276 printf("\n%-20s", "");
277 if (opt & OPT_FSTYPE) {
278 if (printf(" %-10s", fs_type) > 11 && !(opt & OPT_POSIX))
279 printf("\n%-30s", "");
280 }
281 #endif
282
283 #if ENABLE_FEATURE_HUMAN_READABLE
284 printf(" %9s ",
285 /* f_blocks x f_frsize / df_disp_hr, show one fractional,
286 * use suffixes if df_disp_hr == 0 */
287 make_human_readable_str(s.f_blocks, s.f_frsize, df_disp_hr));
288
289 printf(" %9s " + 1,
290 /* EXPR x f_frsize / df_disp_hr, show one fractional,
291 * use suffixes if df_disp_hr == 0 */
292 make_human_readable_str((s.f_blocks - s.f_bfree),
293 s.f_frsize, df_disp_hr));
294
295 printf("%9s %3u%% %s\n",
296 /* f_bavail x f_frsize / df_disp_hr, show one fractional,
297 * use suffixes if df_disp_hr == 0 */
298 make_human_readable_str(s.f_bavail, s.f_frsize, df_disp_hr),
299 blocks_percent_used, mount_point);
300 #else
301 printf(" %9lu %9lu %9lu %3u%% %s\n",
302 kscale(s.f_blocks, s.f_frsize),
303 kscale(s.f_blocks - s.f_bfree, s.f_frsize),
304 kscale(s.f_bavail, s.f_frsize),
305 blocks_percent_used, mount_point);
306 #endif
307 }
308 }
309
310 return status;
311 }
312