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 tarball for details.
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
29 #if !ENABLE_FEATURE_HUMAN_READABLE
30 static unsigned long kscale(unsigned long b
, unsigned long bs
)
32 return (b
* (unsigned long long) bs
+ 1024/2) / 1024;
36 int df_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
37 int df_main(int argc
, char **argv
)
39 unsigned long blocks_used
;
40 unsigned blocks_percent_used
;
41 unsigned long df_disp_hr
= 1024;
42 int status
= EXIT_SUCCESS
;
45 struct mntent
*mount_entry
;
51 OPT_ALL
= (1 << 2) * ENABLE_FEATURE_DF_FANCY
,
52 OPT_INODE
= (1 << 3) * ENABLE_FEATURE_DF_FANCY
,
53 OPT_BSIZE
= (1 << 4) * ENABLE_FEATURE_DF_FANCY
,
54 OPT_HUMAN
= (1 << (2 + 3*ENABLE_FEATURE_DF_FANCY
)) * ENABLE_FEATURE_HUMAN_READABLE
,
55 OPT_MEGA
= (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY
)) * ENABLE_FEATURE_HUMAN_READABLE
,
57 const char *disp_units_hdr
= NULL
;
60 #if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
61 opt_complementary
= "k-mB:m-Bk:B-km";
62 #elif ENABLE_FEATURE_HUMAN_READABLE
63 opt_complementary
= "k-m:m-k";
65 opt
= getopt32(argv
, "kP"
66 USE_FEATURE_DF_FANCY("aiB:")
67 USE_FEATURE_HUMAN_READABLE("hm")
68 USE_FEATURE_DF_FANCY(, &chp
));
70 df_disp_hr
= 1024*1024;
73 df_disp_hr
= xatoul_range(chp
, 1, ULONG_MAX
); /* disallow 0 */
75 /* From the manpage of df from coreutils-6.10:
76 Disk space is shown in 1K blocks by default, unless the environment
77 variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
79 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
82 if (opt
& OPT_HUMAN
) {
84 disp_units_hdr
= " Size";
87 disp_units_hdr
= " Inodes";
89 if (disp_units_hdr
== NULL
) {
90 #if ENABLE_FEATURE_HUMAN_READABLE
91 disp_units_hdr
= xasprintf("%s-blocks",
92 make_human_readable_str(df_disp_hr
, 0, !!(opt
& OPT_POSIX
)));
94 disp_units_hdr
= xasprintf("%lu-blocks", df_disp_hr
);
97 printf("Filesystem %-15sUsed Available %s Mounted on\n",
98 disp_units_hdr
, (opt
& OPT_POSIX
) ? "Capacity" : "Use%");
102 if (optind
>= argc
) {
103 mount_table
= setmntent(bb_path_mtab_file
, "r");
105 bb_perror_msg_and_die(bb_path_mtab_file
);
110 const char *mount_point
;
113 mount_entry
= getmntent(mount_table
);
115 endmntent(mount_table
);
119 mount_point
= *argv
++;
122 mount_entry
= find_mount_point(mount_point
);
124 bb_error_msg("%s: can't find mount point", mount_point
);
126 status
= EXIT_FAILURE
;
131 device
= mount_entry
->mnt_fsname
;
132 mount_point
= mount_entry
->mnt_dir
;
134 if (statfs(mount_point
, &s
) != 0) {
135 bb_simple_perror_msg(mount_point
);
139 if ((s
.f_blocks
> 0) || !mount_table
|| (opt
& OPT_ALL
)) {
140 if (opt
& OPT_INODE
) {
141 s
.f_blocks
= s
.f_files
;
142 s
.f_bavail
= s
.f_bfree
= s
.f_ffree
;
148 blocks_used
= s
.f_blocks
- s
.f_bfree
;
149 blocks_percent_used
= 0;
150 if (blocks_used
+ s
.f_bavail
) {
151 blocks_percent_used
= (blocks_used
* 100ULL
152 + (blocks_used
+ s
.f_bavail
)/2
153 ) / (blocks_used
+ s
.f_bavail
);
156 /* GNU coreutils 6.10 skips certain mounts, try to be compatible. */
157 if (strcmp(device
, "rootfs") == 0)
160 #ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
161 /* ... and also this is the only user of find_block_device */
162 if (strcmp(device
, "/dev/root") == 0) {
163 /* Adjusts device to be the real root device,
164 * or leaves device alone if it can't find it */
165 device
= find_block_device("/");
172 if (printf("\n%-20s" + 1, device
) > 20)
173 printf("\n%-20s", "");
174 #if ENABLE_FEATURE_HUMAN_READABLE
176 make_human_readable_str(s
.f_blocks
, s
.f_bsize
, df_disp_hr
));
179 make_human_readable_str((s
.f_blocks
- s
.f_bfree
),
180 s
.f_bsize
, df_disp_hr
));
182 printf("%9s %3u%% %s\n",
183 make_human_readable_str(s
.f_bavail
, s
.f_bsize
, df_disp_hr
),
184 blocks_percent_used
, mount_point
);
186 printf(" %9lu %9lu %9lu %3u%% %s\n",
187 kscale(s
.f_blocks
, s
.f_bsize
),
188 kscale(s
.f_blocks
- s
.f_bfree
, s
.f_bsize
),
189 kscale(s
.f_bavail
, s
.f_bsize
),
190 blocks_percent_used
, mount_point
);