1 /* vi: set sw=4 ts=4: */
3 * tune2fs: utility to modify EXT2 filesystem
5 * Busybox'ed (2009) by Vladimir Dronnikov <dronnikov@gmail.com>
7 * Licensed under GPLv2, see file LICENSE in this source tree.
9 //config:config TUNE2FS
10 //config: bool "tune2fs"
11 //config: default n # off: it is too limited compared to upstream version
13 //config: tune2fs allows the system administrator to adjust various tunable
14 //config: filesystem parameters on Linux ext2/ext3 filesystems.
16 //applet:IF_TUNE2FS(APPLET(tune2fs, BB_DIR_SBIN, BB_SUID_DROP))
18 //kbuild:lib-$(CONFIG_TUNE2FS) += tune2fs.o
20 //usage:#define tune2fs_trivial_usage
21 //usage: "[-c MAX_MOUNT_COUNT] "
22 ////usage: "[-e errors-behavior] [-g group] "
24 ////usage: "[-j] [-J journal-options] [-l] [-s sparse-flag] "
25 ////usage: "[-m reserved-blocks-percent] [-o [^]mount-options[,...]] "
26 ////usage: "[-r reserved-blocks-count] [-u user] "
27 //usage: "[-C MOUNT_COUNT] "
28 //usage: "[-L LABEL] "
29 ////usage: "[-M last-mounted-dir] [-O [^]feature[,...]] "
30 ////usage: "[-T last-check-time] [-U UUID] "
33 //usage:#define tune2fs_full_usage "\n\n"
34 //usage: "Adjust filesystem options on ext[23] filesystems"
38 #include "bb_e2fs_defs.h"
41 char BUG_wrong_field_size(void);
42 #define STORE_LE(field, value) \
44 if (sizeof(field) == 4) \
45 field = SWAP_LE32(value); \
46 else if (sizeof(field) == 2) \
47 field = SWAP_LE16(value); \
48 else if (sizeof(field) == 1) \
51 BUG_wrong_field_size(); \
54 #define FETCH_LE32(field) \
55 (sizeof(field) == 4 ? SWAP_LE32(field) : BUG_wrong_field_size())
58 OPT_L = 1 << 0, // label
59 OPT_c = 1 << 1, // max mount count
60 OPT_i = 1 << 2, // check interval
61 OPT_C = 1 << 3, // current mount count
64 int tune2fs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
65 int tune2fs_main(int argc UNUSED_PARAM, char **argv)
68 const char *label, *str_c, *str_i, *str_C;
69 struct ext2_super_block *sb;
72 opt_complementary = "=1";
73 opts = getopt32(argv, "L:c:i:C:", &label, &str_c, &str_i, &str_C);
76 argv += optind; // argv[0] -- device
79 fd = xopen(argv[0], O_RDWR);
80 xlseek(fd, 1024, SEEK_SET);
85 //STORE_LE(sb->s_wtime, time(NULL)); - why bother?
88 int n = xatoi_range(str_C, 1, 0xfffe);
89 STORE_LE(sb->s_mnt_count, (unsigned)n);
94 safe_strncpy((char *)sb->s_volume_name, label, sizeof(sb->s_volume_name));
97 int n = xatoi_range(str_c, -1, 0xfffe);
100 STORE_LE(sb->s_max_mnt_count, (unsigned)n);
104 unsigned n = xatou_range(str_i, 0, (unsigned)0xffffffff / (24*60*60)) * 24*60*60;
105 STORE_LE(sb->s_checkinterval, n);
109 xlseek(fd, 1024, SEEK_SET);
110 xwrite(fd, sb, 1024);
112 if (ENABLE_FEATURE_CLEAN_UP) {