1 /* du.c - disk usage program.
2 *
3 * Copyright 2012 Ashwini Kumar <ak.ashwini@gmail.com>
4 *
5 * See http://opengroup.org/onlinepubs/9699919799/utilities/du.html
6 *
7 * TODO: cleanup
8
9 USE_DU(NEWTOY(du, "d#<0hmlcaHkKLsx[-HL][-kKmh]", TOYFLAG_USR|TOYFLAG_BIN))
10
11 config DU
12 bool "du"
13 default y
14 help
15 usage: du [-d N] [-askxHLlmc] [file...]
16
17 Show disk usage, space consumed by files and directories.
18
19 Size in:
20 -k 1024 byte blocks (default)
21 -K 512 byte blocks (posix)
22 -m megabytes
23 -h human readable format (e.g., 1K 243M 2G )
24
25 What to show:
26 -a all files, not just directories
27 -H follow symlinks on cmdline
28 -L follow all symlinks
29 -s only total size of each argument
30 -x don't leave this filesystem
31 -c cumulative total
32 -d N only depth < N
33 -l disable hardlink filter
34 */
35
36 #define FOR_du
37 #include "toys.h"
38
39 GLOBALS(
40 long maxdepth;
41
42 unsigned long depth, total;
43 dev_t st_dev;
44 void *inodes;
45 )
46
47 typedef struct node_size {
48 struct dirtree *node;
49 long size;
50 } node_size;
51
52 // Print the size and name, given size in bytes
print(long long size,struct dirtree * node)53 static void print(long long size, struct dirtree *node)
54 {
55 char *name = "total";
56
57 if (TT.maxdepth && TT.depth > TT.maxdepth) return;
58
59 if (toys.optflags & FLAG_h) {
60 human_readable(toybuf, size, 0);
61 printf("%s", toybuf);
62 } else {
63 int bits = 10;
64
65 if (toys.optflags & FLAG_K) bits = 9;
66 else if (toys.optflags & FLAG_m) bits = 20;
67
68 printf("%llu", (size>>bits)+!!(size&((1<<bits)-1)));
69 }
70 if (node) name = dirtree_path(node, NULL);
71 xprintf("\t%s\n", name);
72 if (node) free(name);
73 }
74
75 // Return whether or not we've seen this inode+dev, adding it to the list if
76 // we haven't.
seen_inode(void ** list,struct stat * st)77 static int seen_inode(void **list, struct stat *st)
78 {
79 if (!st) llist_traverse(st, free);
80
81 // Skipping dir nodes isn't _quite_ right. They're not hardlinked, but could
82 // be bind mounted. Still, it's more efficient and the archivers can't use
83 // hardlinked directory info anyway. (Note that we don't catch bind mounted
84 // _files_ because it doesn't change st_nlink.)
85 else if (!S_ISDIR(st->st_mode) && st->st_nlink > 1) {
86 struct inode_list {
87 struct inode_list *next;
88 ino_t ino;
89 dev_t dev;
90 } *new;
91
92 for (new = *list; new; new = new->next)
93 if(new->ino == st->st_ino && new->dev == st->st_dev)
94 return 1;
95
96 new = xzalloc(sizeof(*new));
97 new->ino = st->st_ino;
98 new->dev = st->st_dev;
99 new->next = *list;
100 *list = new;
101 }
102
103 return 0;
104 }
105
106 // dirtree callback, compute/display size of node
do_du(struct dirtree * node)107 static int do_du(struct dirtree *node)
108 {
109 unsigned long blocks;
110
111 if (!node->parent) TT.st_dev = node->st.st_dev;
112 else if (!dirtree_notdotdot(node)) return 0;
113
114 // detect swiching filesystems
115 if ((toys.optflags & FLAG_x) && (TT.st_dev != node->st.st_dev))
116 return 0;
117
118 // Don't loop endlessly on recursive directory symlink
119 if (toys.optflags & FLAG_L) {
120 struct dirtree *try = node;
121
122 while ((try = try->parent))
123 if (node->st.st_dev==try->st.st_dev && node->st.st_ino==try->st.st_ino)
124 return 0;
125 }
126
127 // Don't count hard links twice
128 if (!(toys.optflags & FLAG_l) && !node->again)
129 if (seen_inode(&TT.inodes, &node->st)) return 0;
130
131 // Collect child info before printing directory size
132 if (S_ISDIR(node->st.st_mode)) {
133 if (!node->again) {
134 TT.depth++;
135 return DIRTREE_COMEAGAIN|(DIRTREE_SYMFOLLOW*!!(toys.optflags&FLAG_L));
136 } else TT.depth--;
137 }
138
139 // Modern compilers' optimizers are insane and think signed overflow
140 // behaves differently than unsigned overflow. Sigh. Big hammer.
141 blocks = node->st.st_blocks + (unsigned long)node->extra;
142 node->extra = blocks;
143 if (node->parent)
144 node->parent->extra = (unsigned long)node->parent->extra+blocks;
145 else TT.total += node->extra;
146
147 if ((toys.optflags & FLAG_a) || !node->parent
148 || (S_ISDIR(node->st.st_mode) && !(toys.optflags & FLAG_s)))
149 {
150 blocks = node->extra;
151 print(blocks*512LL, node);
152 }
153
154 return 0;
155 }
156
du_main(void)157 void du_main(void)
158 {
159 char *noargs[] = {".", 0}, **args;
160
161 // Loop over command line arguments, recursing through children
162 for (args = toys.optc ? toys.optargs : noargs; *args; args++)
163 dirtree_flagread(*args, DIRTREE_SYMFOLLOW*!!(toys.optflags&(FLAG_H|FLAG_L)),
164 do_du);
165 if (toys.optflags & FLAG_c) print(TT.total*512, 0);
166
167 if (CFG_TOYBOX_FREE) seen_inode(TT.inodes, 0);
168 }
169