blob: 119460a1a8810a03acf08a6a719919b74ae849e8
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * tune2fs: utility to modify EXT2 filesystem |
4 | * |
5 | * Busybox'ed (2009) by Vladimir Dronnikov <dronnikov@gmail.com> |
6 | * |
7 | * Licensed under GPLv2, see file LICENSE in this source tree. |
8 | */ |
9 | #include "libbb.h" |
10 | #include <linux/fs.h> |
11 | #include "bb_e2fs_defs.h" |
12 | |
13 | // storage helpers |
14 | char BUG_wrong_field_size(void); |
15 | #define STORE_LE(field, value) \ |
16 | do { \ |
17 | if (sizeof(field) == 4) \ |
18 | field = SWAP_LE32(value); \ |
19 | else if (sizeof(field) == 2) \ |
20 | field = SWAP_LE16(value); \ |
21 | else if (sizeof(field) == 1) \ |
22 | field = (value); \ |
23 | else \ |
24 | BUG_wrong_field_size(); \ |
25 | } while (0) |
26 | |
27 | #define FETCH_LE32(field) \ |
28 | (sizeof(field) == 4 ? SWAP_LE32(field) : BUG_wrong_field_size()) |
29 | |
30 | //usage:#define tune2fs_trivial_usage |
31 | //usage: "[-c MAX_MOUNT_COUNT] " |
32 | ////usage: "[-e errors-behavior] [-g group] " |
33 | //usage: "[-i DAYS] " |
34 | ////usage: "[-j] [-J journal-options] [-l] [-s sparse-flag] " |
35 | ////usage: "[-m reserved-blocks-percent] [-o [^]mount-options[,...]] " |
36 | ////usage: "[-r reserved-blocks-count] [-u user] " |
37 | //usage: "[-C MOUNT_COUNT] " |
38 | //usage: "[-L LABEL] " |
39 | ////usage: "[-M last-mounted-dir] [-O [^]feature[,...]] " |
40 | ////usage: "[-T last-check-time] [-U UUID] " |
41 | //usage: "BLOCKDEV" |
42 | //usage: |
43 | //usage:#define tune2fs_full_usage "\n\n" |
44 | //usage: "Adjust filesystem options on ext[23] filesystems" |
45 | |
46 | enum { |
47 | OPT_L = 1 << 0, // label |
48 | OPT_c = 1 << 1, // max mount count |
49 | OPT_i = 1 << 2, // check interval |
50 | OPT_C = 1 << 3, // current mount count |
51 | }; |
52 | |
53 | int tune2fs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
54 | int tune2fs_main(int argc UNUSED_PARAM, char **argv) |
55 | { |
56 | unsigned opts; |
57 | const char *label, *str_c, *str_i, *str_C; |
58 | struct ext2_super_block *sb; |
59 | int fd; |
60 | |
61 | opt_complementary = "=1"; |
62 | opts = getopt32(argv, "L:c:i:C:", &label, &str_c, &str_i, &str_C); |
63 | if (!opts) |
64 | bb_show_usage(); |
65 | argv += optind; // argv[0] -- device |
66 | |
67 | // read superblock |
68 | fd = xopen(argv[0], O_RDWR); |
69 | xlseek(fd, 1024, SEEK_SET); |
70 | sb = xzalloc(1024); |
71 | xread(fd, sb, 1024); |
72 | |
73 | // mangle superblock |
74 | //STORE_LE(sb->s_wtime, time(NULL)); - why bother? |
75 | |
76 | if (opts & OPT_C) { |
77 | int n = xatoi_range(str_C, 1, 0xfffe); |
78 | if (n == 0) n = 1; |
79 | STORE_LE(sb->s_mnt_count, (unsigned)n); |
80 | } |
81 | |
82 | // set the label |
83 | if (opts & OPT_L) |
84 | safe_strncpy((char *)sb->s_volume_name, label, sizeof(sb->s_volume_name)); |
85 | |
86 | if (opts & OPT_c) { |
87 | int n = xatoi_range(str_c, -1, 0xfffe); |
88 | if (n == 0) |
89 | n = -1; |
90 | STORE_LE(sb->s_max_mnt_count, (unsigned)n); |
91 | } |
92 | |
93 | if (opts & OPT_i) { |
94 | unsigned n = xatou_range(str_i, 0, (unsigned)0xffffffff / (24*60*60)) * 24*60*60; |
95 | STORE_LE(sb->s_checkinterval, n); |
96 | } |
97 | |
98 | // write superblock |
99 | xlseek(fd, 1024, SEEK_SET); |
100 | xwrite(fd, sb, 1024); |
101 | |
102 | if (ENABLE_FEATURE_CLEAN_UP) { |
103 | free(sb); |
104 | } |
105 | |
106 | xclose(fd); |
107 | return EXIT_SUCCESS; |
108 | } |
109 |