1 /* df.c - report free disk space.
2 *
3 * Copyright 2006 Rob Landley <rob@landley.net>
4 *
5 * See http://opengroup.org/onlinepubs/9699919799/utilities/df.html
6
7 USE_DF(NEWTOY(df, "Pkt*a[-Pk]", TOYFLAG_SBIN))
8
9 config DF
10 bool "df"
11 default y
12 help
13 usage: df [-t type] [FILESYSTEM ...]
14
15 The "disk free" command shows total/used/available disk space for
16 each filesystem listed on the command line, or all currently mounted
17 filesystems.
18
19 -P The SUSv3 "Pedantic" option
20 -k Sets units back to 1024 bytes (the default without -P)
21 -t type Display only filesystems of this type.
22
23 Pedantic provides a slightly less useful output format dictated by Posix,
24 and sets the units to 512 bytes instead of the default 1024 bytes.
25 */
26
27 #define FOR_df
28 #include "toys.h"
29
GLOBALS(struct arg_list * fstype;long units;)30 GLOBALS(
31 struct arg_list *fstype;
32
33 long units;
34 )
35
36 static void show_mt(struct mtab_list *mt)
37 {
38 int len;
39 long long size, used, avail, percent, block;
40 char *device;
41
42 // Return if it wasn't found (should never happen, but with /etc/mtab...)
43 if (!mt) return;
44
45 // If we have -t, skip other filesystem types
46 if (TT.fstype) {
47 struct arg_list *al;
48
49 for (al = TT.fstype; al; al = al->next)
50 if (!strcmp(mt->type, al->arg)) break;
51
52 if (!al) return;
53 }
54
55 // If we don't have -a, skip synthetic filesystems
56 if (!(toys.optflags & FLAG_a) && !mt->statvfs.f_blocks) return;
57
58 // Figure out how much total/used/free space this filesystem has,
59 // forcing 64-bit math because filesystems are big now.
60 block = mt->statvfs.f_bsize ? mt->statvfs.f_bsize : 1;
61 size = (block * mt->statvfs.f_blocks) / TT.units;
62 used = (block * (mt->statvfs.f_blocks-mt->statvfs.f_bfree)) / TT.units;
63 avail = (block*(getuid()?mt->statvfs.f_bavail:mt->statvfs.f_bfree))/TT.units;
64 if (!(used+avail)) percent = 0;
65 else {
66 percent = (used*100)/(used+avail);
67 if (used*100 != percent*(used+avail)) percent++;
68 }
69
70 device = *mt->device == '/' ? realpath(mt->device, NULL) : NULL;
71 if (!device) device = mt->device;
72
73 // Figure out appropriate spacing
74 len = 25 - strlen(device);
75 if (len < 1) len = 1;
76 xprintf("%s% *lld % 10lld % 10lld % *lld%% %s\n", device, len,
77 size, used, avail, (toys.optflags & FLAG_P) ? 7 : 3, percent, mt->dir);
78
79 if (device != mt->device) free(device);
80 }
81
df_main(void)82 void df_main(void)
83 {
84 struct mtab_list *mt, *mtstart, *mtend;
85 int p = toys.optflags & FLAG_P;
86
87 // Units are 512 bytes if you select "pedantic" without "kilobytes".
88 TT.units = p ? 512 : 1024;
89 xprintf("Filesystem%8s-blocks\tUsed Available %s Mounted on\n",
90 p ? "512" : "1K", p ? "Capacity" : "Use%");
91
92 if (!(mtstart = xgetmountlist(0))) return;
93 mtend = dlist_terminate(mtstart);
94
95 // If we have a list of filesystems on the command line, loop through them.
96 if (*toys.optargs) {
97 char **next;
98
99 for(next = toys.optargs; *next; next++) {
100 struct stat st;
101
102 // Stat it (complain if we can't).
103 if(stat(*next, &st)) {
104 perror_msg("'%s'", *next);
105 continue;
106 }
107
108 // Find and display this filesystem. Use _last_ hit in case of
109 // overmounts (which is first hit in the reversed list).
110 for (mt = mtend; mt; mt = mt->prev) {
111 if (st.st_dev == mt->stat.st_dev
112 || (st.st_rdev && (st.st_rdev == mt->stat.st_dev)))
113 {
114 show_mt(mt);
115 break;
116 }
117 }
118 }
119 } else {
120 // Loop through mount list to filter out overmounts.
121 for (mt = mtend; mt; mt = mt->prev) {
122 struct mtab_list *mt2, *mt3;
123
124 // 0:0 is LANANA null device
125 if (!mt->stat.st_dev) continue;
126
127 // Filter out overmounts.
128 mt3 = mt;
129 for (mt2 = mt->prev; mt2; mt2 = mt2->prev) {
130 if (mt->stat.st_dev == mt2->stat.st_dev) {
131 // For --bind mounts, show earliest mount
132 if (!strcmp(mt->device, mt2->device)) {
133 if (!toys.optflags & FLAG_a) mt3->stat.st_dev = 0;
134 mt3 = mt2;
135 } else mt2->stat.st_dev = 0;
136 }
137 }
138 }
139 // Cosmetic: show filesystems in creation order
140 for (mt = mtstart; mt; mt = mt->next) if (mt->stat.st_dev) show_mt(mt);
141 }
142
143 if (CFG_TOYBOX_FREE) llist_traverse(mtstart, free);
144 }
145