busybox/e2fsprogs/tune2fs.c

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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 (4.4 kb)"
//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_NOEXEC(tune2fs, tune2fs, BB_DIR_SBIN, BB_SUID_DROP, tune2fs))
//TODO alias to "tune2fs -L LABEL": //applet:IF_E2LABEL(APPLET_ODDNAME(e2label, tune2fs, BB_DIR_SBIN, BB_SUID_DROP, e2label))
//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;
getopt32: remove opt_complementary function old new delta vgetopt32 1318 1392 +74 runsvdir_main 703 713 +10 bb_make_directory 423 425 +2 collect_cpu 546 545 -1 opt_chars 3 - -3 opt_complementary 4 - -4 tftpd_main 567 562 -5 ntp_init 476 471 -5 zcip_main 1266 1256 -10 xxd_main 428 418 -10 whois_main 140 130 -10 who_main 463 453 -10 which_main 212 202 -10 wget_main 2535 2525 -10 watchdog_main 291 281 -10 watch_main 222 212 -10 vlock_main 399 389 -10 uuencode_main 332 322 -10 uudecode_main 316 306 -10 unlink_main 45 35 -10 udhcpd_main 1482 1472 -10 udhcpc_main 2762 2752 -10 tune2fs_main 290 280 -10 tunctl_main 366 356 -10 truncate_main 218 208 -10 tr_main 518 508 -10 time_main 1134 1124 -10 tftp_main 286 276 -10 telnetd_main 1873 1863 -10 tcpudpsvd_main 1785 1775 -10 taskset_main 521 511 -10 tar_main 1009 999 -10 tail_main 1644 1634 -10 syslogd_main 1967 1957 -10 switch_root_main 368 358 -10 svlogd_main 1454 1444 -10 sv 1296 1286 -10 stat_main 104 94 -10 start_stop_daemon_main 1028 1018 -10 split_main 542 532 -10 sort_main 796 786 -10 slattach_main 624 614 -10 shuf_main 504 494 -10 setsid_main 96 86 -10 setserial_main 1132 1122 -10 setfont_main 388 378 -10 setconsole_main 78 68 -10 sendmail_main 1209 1199 -10 sed_main 677 667 -10 script_main 1077 1067 -10 run_parts_main 325 315 -10 rtcwake_main 454 444 -10 rm_main 175 165 -10 reformime_main 119 109 -10 readlink_main 123 113 -10 rdate_main 246 236 -10 pwdx_main 189 179 -10 pstree_main 317 307 -10 pscan_main 663 653 -10 popmaildir_main 818 808 -10 pmap_main 80 70 -10 nc_main 1042 1032 -10 mv_main 558 548 -10 mountpoint_main 477 467 -10 mount_main 1264 1254 -10 modprobe_main 768 758 -10 modinfo_main 333 323 -10 mktemp_main 200 190 -10 mkswap_main 324 314 -10 mkfs_vfat_main 1489 1479 -10 microcom_main 715 705 -10 md5_sha1_sum_main 521 511 -10 man_main 867 857 -10 makedevs_main 1052 1042 -10 ls_main 563 553 -10 losetup_main 432 422 -10 loadfont_main 89 79 -10 ln_main 524 514 -10 link_main 75 65 -10 ipcalc_main 544 534 -10 iostat_main 2397 2387 -10 install_main 768 758 -10 id_main 480 470 -10 i2cset_main 1239 1229 -10 i2cget_main 380 370 -10 i2cdump_main 1482 1472 -10 i2cdetect_main 682 672 -10 hwclock_main 406 396 -10 httpd_main 741 731 -10 grep_main 837 827 -10 getty_main 1559 1549 -10 fuser_main 297 287 -10 ftpgetput_main 345 335 -10 ftpd_main 2232 2222 -10 fstrim_main 251 241 -10 fsfreeze_main 77 67 -10 fsck_minix_main 2921 2911 -10 flock_main 314 304 -10 flashcp_main 740 730 -10 flash_eraseall_main 833 823 -10 fdformat_main 532 522 -10 expand_main 680 670 -10 eject_main 335 325 -10 dumpleases_main 630 620 -10 du_main 314 304 -10 dos2unix_main 441 431 -10 diff_main 1350 1340 -10 df_main 1064 1054 -10 date_main 1095 1085 -10 cut_main 961 951 -10 cryptpw_main 228 218 -10 crontab_main 575 565 -10 crond_main 1149 1139 -10 cp_main 370 360 -10 common_traceroute_main 3834 3824 -10 common_ping_main 1767 1757 -10 comm_main 239 229 -10 cmp_main 655 645 -10 chrt_main 379 369 -10 chpst_main 704 694 -10 chpasswd_main 308 298 -10 chown_main 171 161 -10 chmod_main 158 148 -10 cat_main 428 418 -10 bzip2_main 120 110 -10 blkdiscard_main 264 254 -10 base64_main 221 211 -10 arping_main 1665 1655 -10 ar_main 556 546 -10 adjtimex_main 406 396 -10 adduser_main 882 872 -10 addgroup_main 411 401 -10 acpid_main 1198 1188 -10 optstring 11 - -11 opt_string 18 - -18 OPT_STR 25 - -25 ubi_tools_main 1288 1258 -30 ls_options 31 - -31 ------------------------------------------------------------------------------ (add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383) Total: -1297 bytes text data bss dec hex filename 915428 485 6876 922789 e14a5 busybox_old 914629 485 6872 921986 e1182 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-09 01:25:02 +05:30
opts = getopt32(argv, "^" "L:c:i:C:" "\0" "=1", &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;
}