source: branches/3.2/mindi-busybox/e2fsprogs/tune2fs.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
  • Property svn:eol-style set to native
File size: 2.7 KB
Line 
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
14char BUG_wrong_field_size(void);
15#define STORE_LE(field, value) \
16do { \
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
46enum {
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
53int tune2fs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
54int 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        STORE_LE(sb->s_mnt_count, (unsigned)n);
79    }
80
81    // set the label
82    if (opts & OPT_L)
83        safe_strncpy((char *)sb->s_volume_name, label, sizeof(sb->s_volume_name));
84
85    if (opts & OPT_c) {
86        int n = xatoi_range(str_c, -1, 0xfffe);
87        if (n == 0)
88            n = -1;
89        STORE_LE(sb->s_max_mnt_count, (unsigned)n);
90    }
91
92    if (opts & OPT_i) {
93        unsigned n = xatou_range(str_i, 0, (unsigned)0xffffffff / (24*60*60)) * 24*60*60;
94        STORE_LE(sb->s_checkinterval, n);
95    }
96
97    // write superblock
98    xlseek(fd, 1024, SEEK_SET);
99    xwrite(fd, sb, 1024);
100
101    if (ENABLE_FEATURE_CLEAN_UP) {
102        free(sb);
103    }
104
105    xclose(fd);
106    return EXIT_SUCCESS;
107}
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