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")
28 //usage: IF_FEATURE_DF_FANCY("ai] [-B SIZE")
29 //usage: "] [FILESYSTEM]..."
30 //usage:#define df_full_usage "\n\n"
31 //usage: "Print filesystem usage statistics\n"
32 //usage: "\n -P POSIX output format"
33 //usage: "\n -k 1024-byte blocks (default)"
34 //usage: IF_FEATURE_HUMAN_READABLE(
35 //usage: "\n -m 1M-byte blocks"
36 //usage: "\n -h Human readable (e.g. 1K 243M 2G)"
38 //usage: IF_FEATURE_DF_FANCY(
39 //usage: "\n -a Show all filesystems"
40 //usage: "\n -i Inodes"
41 //usage: "\n -B SIZE Blocksize"
44 //usage:#define df_example_usage
46 //usage: "Filesystem 1K-blocks Used Available Use% Mounted on\n"
47 //usage: "/dev/sda3 8690864 8553540 137324 98% /\n"
48 //usage: "/dev/sda1 64216 36364 27852 57% /boot\n"
49 //usage: "$ df /dev/sda3\n"
50 //usage: "Filesystem 1K-blocks Used Available Use% Mounted on\n"
51 //usage: "/dev/sda3 8690864 8553540 137324 98% /\n"
52 //usage: "$ POSIXLY_CORRECT=sure df /dev/sda3\n"
53 //usage: "Filesystem 512B-blocks Used Available Use% Mounted on\n"
54 //usage: "/dev/sda3 17381728 17107080 274648 98% /\n"
55 //usage: "$ POSIXLY_CORRECT=yep df -P /dev/sda3\n"
56 //usage: "Filesystem 512-blocks Used Available Capacity Mounted on\n"
57 //usage: "/dev/sda3 17381728 17107080 274648 98% /\n"
64 #if !ENABLE_FEATURE_HUMAN_READABLE
65 static unsigned long kscale(unsigned long b
, unsigned long bs
)
67 return (b
* (unsigned long long) bs
+ 1024/2) / 1024;
71 int df_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
72 int df_main(int argc UNUSED_PARAM
, char **argv
)
74 unsigned long blocks_used
;
75 unsigned blocks_percent_used
;
76 unsigned long df_disp_hr
= 1024;
77 int status
= EXIT_SUCCESS
;
80 struct mntent
*mount_entry
;
86 OPT_ALL
= (1 << 2) * ENABLE_FEATURE_DF_FANCY
,
87 OPT_INODE
= (1 << 3) * ENABLE_FEATURE_DF_FANCY
,
88 OPT_BSIZE
= (1 << 4) * ENABLE_FEATURE_DF_FANCY
,
89 OPT_HUMAN
= (1 << (2 + 3*ENABLE_FEATURE_DF_FANCY
)) * ENABLE_FEATURE_HUMAN_READABLE
,
90 OPT_MEGA
= (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY
)) * ENABLE_FEATURE_HUMAN_READABLE
,
92 const char *disp_units_hdr
= NULL
;
97 #if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
98 opt_complementary
= "k-mB:m-Bk:B-km";
99 #elif ENABLE_FEATURE_HUMAN_READABLE
100 opt_complementary
= "k-m:m-k";
102 opt
= getopt32(argv
, "kP"
103 IF_FEATURE_DF_FANCY("aiB:")
104 IF_FEATURE_HUMAN_READABLE("hm")
105 IF_FEATURE_DF_FANCY(, &chp
));
107 df_disp_hr
= 1024*1024;
110 df_disp_hr
= xatoul_range(chp
, 1, ULONG_MAX
); /* disallow 0 */
112 /* From the manpage of df from coreutils-6.10:
113 * Disk space is shown in 1K blocks by default, unless the environment
114 * variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
116 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
119 if (opt
& OPT_HUMAN
) {
121 disp_units_hdr
= " Size";
124 disp_units_hdr
= " Inodes";
126 if (disp_units_hdr
== NULL
) {
127 #if ENABLE_FEATURE_HUMAN_READABLE
128 disp_units_hdr
= xasprintf("%s-blocks",
129 /* print df_disp_hr, show no fractionals,
130 * use suffixes if OPT_POSIX is set in opt */
131 make_human_readable_str(df_disp_hr
, 0, !!(opt
& OPT_POSIX
))
134 disp_units_hdr
= xasprintf("%lu-blocks", df_disp_hr
);
137 printf("Filesystem %-15sUsed Available %s Mounted on\n",
138 disp_units_hdr
, (opt
& OPT_POSIX
) ? "Capacity" : "Use%");
143 mount_table
= setmntent(bb_path_mtab_file
, "r");
145 bb_perror_msg_and_die(bb_path_mtab_file
);
150 const char *mount_point
;
153 mount_entry
= getmntent(mount_table
);
155 endmntent(mount_table
);
159 mount_point
= *argv
++;
162 mount_entry
= find_mount_point(mount_point
, 1);
164 bb_error_msg("%s: can't find mount point", mount_point
);
166 status
= EXIT_FAILURE
;
171 device
= mount_entry
->mnt_fsname
;
172 mount_point
= mount_entry
->mnt_dir
;
173 if (strcmp(mount_point
, "proc") == 0 || strcmp(mount_point
, "ramfs") == 0)
176 if (statfs(mount_point
, &s
) != 0) {
177 bb_simple_perror_msg(mount_point
);
181 if ((s
.f_blocks
> 0) || !mount_table
|| (opt
& OPT_ALL
)) {
182 if (opt
& OPT_INODE
) {
183 s
.f_blocks
= s
.f_files
;
184 s
.f_bavail
= s
.f_bfree
= s
.f_ffree
;
190 blocks_used
= s
.f_blocks
- s
.f_bfree
;
191 blocks_percent_used
= 0;
192 if (blocks_used
+ s
.f_bavail
) {
193 blocks_percent_used
= (blocks_used
* 100ULL
194 + (blocks_used
+ s
.f_bavail
)/2
195 ) / (blocks_used
+ s
.f_bavail
);
198 /* GNU coreutils 6.10 skips certain mounts, try to be compatible. */
199 if (ENABLE_FEATURE_SKIP_ROOTFS
&& strcmp(device
, "rootfs") == 0)
202 #ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
203 if (strcmp(device
, "/dev/root") == 0) {
204 /* Adjusts device to be the real root device,
205 * or leaves device alone if it can't find it */
206 device
= find_block_device("/");
213 #if ENABLE_UNICODE_SUPPORT
216 char *uni_dev
= unicode_conv_to_printable(&uni_stat
, device
);
217 if (uni_stat
.unicode_width
> 20 && !(opt
& OPT_POSIX
)) {
218 printf("%s\n%20s", uni_dev
, "");
220 printf("%s%*s", uni_dev
, 20 - (int)uni_stat
.unicode_width
, "");
225 if (printf("\n%-20s" + 1, device
) > 20 && !(opt
& OPT_POSIX
))
226 printf("\n%-20s", "");
229 #if ENABLE_FEATURE_HUMAN_READABLE
231 /* f_blocks x f_bsize / df_disp_hr, show one fractional,
232 * use suffixes if df_disp_hr == 0 */
233 make_human_readable_str(s
.f_blocks
, s
.f_bsize
, df_disp_hr
));
236 /* EXPR x f_bsize / df_disp_hr, show one fractional,
237 * use suffixes if df_disp_hr == 0 */
238 make_human_readable_str((s
.f_blocks
- s
.f_bfree
),
239 s
.f_bsize
, df_disp_hr
));
241 printf("%9s %3u%% %s\n",
242 /* f_bavail x f_bsize / df_disp_hr, show one fractional,
243 * use suffixes if df_disp_hr == 0 */
244 make_human_readable_str(s
.f_bavail
, s
.f_bsize
, df_disp_hr
),
245 blocks_percent_used
, mount_point
);
247 printf(" %9lu %9lu %9lu %3u%% %s\n",
248 kscale(s
.f_blocks
, s
.f_bsize
),
249 kscale(s
.f_blocks
- s
.f_bfree
, s
.f_bsize
),
250 kscale(s
.f_bavail
, s
.f_bsize
),
251 blocks_percent_used
, mount_point
);