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/* vi: set sw=4 ts=4: */
/*
* tune2fs: utility to modify EXT2 filesystem
*
* Busybox'ed (2009) by Vladimir Dronnikov <dronnikov@gmail.com>
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
//config:config TUNE2FS
//config: bool "tune2fs"
//config: default n # off: it is too limited compared to upstream version
//config: help
//config: tune2fs allows the system administrator to adjust various tunable
//config: filesystem parameters on Linux ext2/ext3 filesystems.
//applet:IF_TUNE2FS(APPLET(tune2fs, BB_DIR_SBIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_TUNE2FS) += tune2fs.o
//usage:#define tune2fs_trivial_usage
//usage: "[-c MAX_MOUNT_COUNT] "
////usage: "[-e errors-behavior] [-g group] "
//usage: "[-i DAYS] "
////usage: "[-j] [-J journal-options] [-l] [-s sparse-flag] "
////usage: "[-m reserved-blocks-percent] [-o [^]mount-options[,...]] "
////usage: "[-r reserved-blocks-count] [-u user] "
//usage: "[-C MOUNT_COUNT] "
//usage: "[-L LABEL] "
////usage: "[-M last-mounted-dir] [-O [^]feature[,...]] "
////usage: "[-T last-check-time] [-U UUID] "
//usage: "BLOCKDEV"
//usage:
//usage:#define tune2fs_full_usage "\n\n"
//usage: "Adjust filesystem options on ext[23] filesystems"
#include "libbb.h"
#include <linux/fs.h>
#include "bb_e2fs_defs.h"
// storage helpers
char BUG_wrong_field_size(void);
#define STORE_LE(field, value) \
do { \
if (sizeof(field) == 4) \
field = SWAP_LE32(value); \
else if (sizeof(field) == 2) \
field = SWAP_LE16(value); \
else if (sizeof(field) == 1) \
field = (value); \
else \
BUG_wrong_field_size(); \
} while (0)
#define FETCH_LE32(field) \
(sizeof(field) == 4 ? SWAP_LE32(field) : BUG_wrong_field_size())
enum {
OPT_L = 1 << 0, // label
OPT_c = 1 << 1, // max mount count
OPT_i = 1 << 2, // check interval
OPT_C = 1 << 3, // current mount count
};
int tune2fs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int tune2fs_main(int argc UNUSED_PARAM, char **argv)
{
unsigned opts;
const char *label, *str_c, *str_i, *str_C;
struct ext2_super_block *sb;
int fd;
opt_complementary = "=1";
opts = getopt32(argv, "L:c:i:C:", &label, &str_c, &str_i, &str_C);
if (!opts)
bb_show_usage();
argv += optind; // argv[0] -- device
// read superblock
fd = xopen(argv[0], O_RDWR);
xlseek(fd, 1024, SEEK_SET);
sb = xzalloc(1024);
xread(fd, sb, 1024);
// mangle superblock
//STORE_LE(sb->s_wtime, time(NULL)); - why bother?
if (opts & OPT_C) {
int n = xatoi_range(str_C, 1, 0xfffe);
STORE_LE(sb->s_mnt_count, (unsigned)n);
}
// set the label
if (opts & OPT_L)
safe_strncpy((char *)sb->s_volume_name, label, sizeof(sb->s_volume_name));
if (opts & OPT_c) {
int n = xatoi_range(str_c, -1, 0xfffe);
if (n == 0)
n = -1;
STORE_LE(sb->s_max_mnt_count, (unsigned)n);
}
if (opts & OPT_i) {
unsigned n = xatou_range(str_i, 0, (unsigned)0xffffffff / (24*60*60)) * 24*60*60;
STORE_LE(sb->s_checkinterval, n);
}
// write superblock
xlseek(fd, 1024, SEEK_SET);
xwrite(fd, sb, 1024);
if (ENABLE_FEATURE_CLEAN_UP) {
free(sb);
}
xclose(fd);
return EXIT_SUCCESS;
}
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