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 (6.8 kb)"
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: -a Show all filesystems
33 //config: -i Inodes
34 //config: -B <SIZE> Blocksize
35 //config:
36 //config:config FEATURE_SKIP_ROOTFS
37 //config: bool "Skip rootfs in mount table"
38 //config: default y
39 //config: depends on DF
40 //config: help
41 //config: Ignore rootfs entry in mount table.
42 //config:
43 //config: In Linux, kernel has a special filesystem, rootfs, which is initially
44 //config: mounted on /. It contains initramfs data, if kernel is configured
45 //config: to have one. Usually, another file system is mounted over / early
46 //config: in boot process, and therefore most tools which manipulate
47 //config: mount table, such as df, will skip rootfs entry.
48 //config:
49 //config: However, some systems do not mount anything on /.
50 //config: If you need to configure busybox for one of these systems,
51 //config: you may find it useful to turn this option off to make df show
52 //config: initramfs statistics.
53 //config:
54 //config: Otherwise, choose Y.
55
56 //applet:IF_DF(APPLET_NOEXEC(df, df, BB_DIR_BIN, BB_SUID_DROP, df))
57
58 //kbuild:lib-$(CONFIG_DF) += df.o
59
60 /* BB_AUDIT SUSv3 _NOT_ compliant -- option -t missing. */
61 /* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
62
63 //usage:#define df_trivial_usage
64 //usage: "[-Pk"
65 //usage: IF_FEATURE_HUMAN_READABLE("mh")
66 //usage: "T"
67 //usage: IF_FEATURE_DF_FANCY("ai] [-B SIZE")
68 //usage: "] [-t TYPE] [FILESYSTEM]..."
69 //usage:#define df_full_usage "\n\n"
70 //usage: "Print filesystem usage statistics\n"
71 //usage: "\n -P POSIX output format"
72 //usage: "\n -k 1024-byte blocks (default)"
73 //usage: IF_FEATURE_HUMAN_READABLE(
74 //usage: "\n -m 1M-byte blocks"
75 //usage: "\n -h Human readable (e.g. 1K 243M 2G)"
76 //usage: )
77 //usage: "\n -T Print filesystem type"
78 //usage: "\n -t TYPE Print only mounts of this type"
79 //usage: IF_FEATURE_DF_FANCY(
80 //usage: "\n -a Show all filesystems"
81 //usage: "\n -i Inodes"
82 //usage: "\n -B SIZE Blocksize"
83 //usage: )
84 //usage:
85 //usage:#define df_example_usage
86 //usage: "$ df\n"
87 //usage: "Filesystem 1K-blocks Used Available Use% Mounted on\n"
88 //usage: "/dev/sda3 8690864 8553540 137324 98% /\n"
89 //usage: "/dev/sda1 64216 36364 27852 57% /boot\n"
90 //usage: "$ df /dev/sda3\n"
91 //usage: "Filesystem 1K-blocks Used Available Use% Mounted on\n"
92 //usage: "/dev/sda3 8690864 8553540 137324 98% /\n"
93 //usage: "$ POSIXLY_CORRECT=sure df /dev/sda3\n"
94 //usage: "Filesystem 512B-blocks Used Available Use% Mounted on\n"
95 //usage: "/dev/sda3 17381728 17107080 274648 98% /\n"
96 //usage: "$ POSIXLY_CORRECT=yep df -P /dev/sda3\n"
97 //usage: "Filesystem 512-blocks Used Available Capacity Mounted on\n"
98 //usage: "/dev/sda3 17381728 17107080 274648 98% /\n"
99
100 #include <mntent.h>
101 #include <sys/statvfs.h>
102 #include "libbb.h"
103 #include "unicode.h"
104
105 #if !ENABLE_FEATURE_HUMAN_READABLE
kscale(unsigned long b,unsigned long bs)106 static unsigned long kscale(unsigned long b, unsigned long bs)
107 {
108 return (b * (unsigned long long) bs + 1024/2) / 1024;
109 }
110 #endif
111
112 int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
df_main(int argc UNUSED_PARAM,char ** argv)113 int df_main(int argc UNUSED_PARAM, char **argv)
114 {
115 unsigned long df_disp_hr = 1024;
116 int status = EXIT_SUCCESS;
117 unsigned opt;
118 FILE *mount_table;
119 struct mntent *mount_entry;
120 struct statvfs s;
121 enum {
122 OPT_KILO = (1 << 0),
123 OPT_POSIX = (1 << 1),
124 OPT_FSTYPE = (1 << 2),
125 OPT_t = (1 << 3),
126 OPT_ALL = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
127 OPT_INODE = (1 << 5) * ENABLE_FEATURE_DF_FANCY,
128 OPT_BSIZE = (1 << 6) * ENABLE_FEATURE_DF_FANCY,
129 OPT_HUMAN = (1 << (4 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
130 OPT_HUMANDEC = (1 << (5 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
131 OPT_MEGA = (1 << (6 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
132 };
133 const char *disp_units_hdr = NULL;
134 char *chp, *opt_t;
135
136 init_unicode();
137
138 /* From the manpage of df from coreutils-6.10:
139 * Disk space is shown in 1K blocks by default, unless the environment
140 * variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
141 */
142 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
143 df_disp_hr = 512;
144
145 opt = getopt32(argv, "^"
146 "kPTt:"
147 IF_FEATURE_DF_FANCY("aiB:")
148 IF_FEATURE_HUMAN_READABLE("hHm")
149 "\0"
150 #if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
151 "k-mB:m-Bk:B-km"
152 #elif ENABLE_FEATURE_HUMAN_READABLE
153 "k-m:m-k"
154 #endif
155 , &opt_t
156 IF_FEATURE_DF_FANCY(, &chp)
157 );
158 if (opt & OPT_MEGA)
159 df_disp_hr = 1024*1024;
160
161 if (opt & OPT_BSIZE) {
162 /* GNU coreutils 8.25 accepts "-BMiB" form too */
163 int i;
164 for (i = 0; kmg_i_suffixes[i].suffix[0]; i++) {
165 if (strcmp(kmg_i_suffixes[i].suffix, chp) == 0) {
166 df_disp_hr = kmg_i_suffixes[i].mult;
167 goto got_it;
168 }
169 }
170 /* Range used to disallow 0 */
171 df_disp_hr = xatoul_range_sfx(chp, 1, ULONG_MAX, kmg_i_suffixes);
172 got_it: ;
173 }
174
175 if (opt & (OPT_HUMAN|OPT_HUMANDEC)) {
176 df_disp_hr = 0;
177 //TODO: need to add support in make_human_readable_str() for "decimal human readable"
178 //if (opt & OPT_HUMANDEC)
179 // df_disp_hr--;
180 disp_units_hdr = " Size";
181 }
182 if (opt & OPT_INODE)
183 disp_units_hdr = " Inodes";
184
185 if (disp_units_hdr == NULL) {
186 #if ENABLE_FEATURE_HUMAN_READABLE
187 disp_units_hdr = xasprintf("%s-blocks",
188 /* print df_disp_hr, show no fractionals,
189 * use suffixes if OPT_POSIX is set in opt */
190 make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX))
191 );
192 #else
193 disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
194 #endif
195 }
196
197 printf("Filesystem %s%-15sUsed Available %s Mounted on\n",
198 (opt & OPT_FSTYPE) ? "Type " : "",
199 disp_units_hdr,
200 (opt & OPT_POSIX) ? "Capacity" : "Use%");
201
202 mount_table = NULL;
203 argv += optind;
204 if (!argv[0]) {
205 mount_table = setmntent(bb_path_mtab_file, "r");
206 if (!mount_table)
207 bb_simple_perror_msg_and_die(bb_path_mtab_file);
208 }
209
210 while (1) {
211 const char *device;
212 const char *mount_point;
213 const char *fs_type;
214
215 if (mount_table) {
216 mount_entry = getmntent(mount_table);
217 if (!mount_entry) {
218 endmntent(mount_table);
219 break;
220 }
221 } else {
222 mount_point = *argv++;
223 if (!mount_point)
224 break;
225 mount_entry = find_mount_point(mount_point, 1);
226 if (!mount_entry) {
227 bb_error_msg("%s: can't find mount point", mount_point);
228 set_error:
229 status = EXIT_FAILURE;
230 continue;
231 }
232 }
233
234 device = mount_entry->mnt_fsname;
235
236 /* GNU coreutils 6.10 skips certain mounts, try to be compatible */
237 if (ENABLE_FEATURE_SKIP_ROOTFS && strcmp(device, "rootfs") == 0)
238 continue;
239
240 mount_point = mount_entry->mnt_dir;
241 fs_type = mount_entry->mnt_type;
242
243 if (opt & OPT_t) {
244 if (strcmp(fs_type, opt_t) != 0)
245 continue;
246 }
247
248 if (statvfs(mount_point, &s) != 0) {
249 bb_simple_perror_msg(mount_point);
250 goto set_error;
251 }
252 /* Some uclibc versions were seen to lose f_frsize
253 * (kernel does return it, but then uclibc does not copy it)
254 */
255 if (s.f_frsize == 0)
256 s.f_frsize = s.f_bsize;
257
258 if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
259 unsigned long long blocks_used;
260 unsigned long long blocks_total;
261 unsigned blocks_percent_used;
262
263 if (opt & OPT_INODE) {
264 s.f_blocks = s.f_files;
265 s.f_bavail = s.f_bfree = s.f_ffree;
266 s.f_frsize = 1;
267 if (df_disp_hr)
268 df_disp_hr = 1;
269 }
270 blocks_used = s.f_blocks - s.f_bfree;
271 blocks_total = blocks_used + s.f_bavail;
272 blocks_percent_used = blocks_total; /* 0% if blocks_total == 0, else... */
273 if (blocks_total != 0) {
274 /* Downscale sizes for narrower division */
275 unsigned u;
276 while (blocks_total >= INT_MAX / 101) {
277 blocks_total >>= 1;
278 blocks_used >>= 1;
279 }
280 u = (unsigned)blocks_used * 100u + (unsigned)blocks_total / 2;
281 blocks_percent_used = u / (unsigned)blocks_total;
282 }
283
284 #ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
285 if (strcmp(device, "/dev/root") == 0) {
286 /* Adjusts device to be the real root device,
287 * or leaves device alone if it can't find it */
288 device = find_block_device("/");
289 if (!device) {
290 goto set_error;
291 }
292 }
293 #endif
294
295 #if ENABLE_UNICODE_SUPPORT
296 {
297 uni_stat_t uni_stat;
298 char *uni_dev = unicode_conv_to_printable(&uni_stat, device);
299 if (uni_stat.unicode_width > 20 && !(opt & OPT_POSIX)) {
300 printf("%s\n%20s", uni_dev, "");
301 } else {
302 printf("%s%*s", uni_dev, 20 - (int)uni_stat.unicode_width, "");
303 }
304 free(uni_dev);
305 if (opt & OPT_FSTYPE) {
306 char *uni_type = unicode_conv_to_printable(&uni_stat, fs_type);
307 if (uni_stat.unicode_width > 10 && !(opt & OPT_POSIX))
308 printf(" %s\n%31s", uni_type, "");
309 else
310 printf(" %s%*s", uni_type, 10 - (int)uni_stat.unicode_width, "");
311 free(uni_type);
312 }
313 }
314 #else
315 if (printf("\n%-20s" + 1, device) > 20 && !(opt & OPT_POSIX))
316 printf("\n%-20s", "");
317 if (opt & OPT_FSTYPE) {
318 if (printf(" %-10s", fs_type) > 11 && !(opt & OPT_POSIX))
319 printf("\n%-30s", "");
320 }
321 #endif
322
323 #if ENABLE_FEATURE_HUMAN_READABLE
324 printf(" %9s ",
325 /* f_blocks x f_frsize / df_disp_hr, show one fractional,
326 * use suffixes if df_disp_hr == 0 */
327 make_human_readable_str(s.f_blocks, s.f_frsize, df_disp_hr));
328
329 printf(" %9s " + 1,
330 /* EXPR x f_frsize / df_disp_hr, show one fractional,
331 * use suffixes if df_disp_hr == 0 */
332 make_human_readable_str((s.f_blocks - s.f_bfree),
333 s.f_frsize, df_disp_hr));
334
335 printf("%9s %3u%% %s\n",
336 /* f_bavail x f_frsize / df_disp_hr, show one fractional,
337 * use suffixes if df_disp_hr == 0 */
338 make_human_readable_str(s.f_bavail, s.f_frsize, df_disp_hr),
339 blocks_percent_used, mount_point);
340 #else
341 printf(" %9lu %9lu %9lu %3u%% %s\n",
342 kscale(s.f_blocks, s.f_frsize),
343 kscale(s.f_blocks - s.f_bfree, s.f_frsize),
344 kscale(s.f_bavail, s.f_frsize),
345 blocks_percent_used, mount_point);
346 #endif
347 }
348 }
349
350 return status;
351 }
352