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Denys Vlasenko3945bc12009-10-22 00:55:55 +02001/* 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 *
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +02007 * Licensed under GPLv2, see file LICENSE in this source tree.
Denys Vlasenko3945bc12009-10-22 00:55:55 +02008 */
Denys Vlasenko000eda42015-10-18 22:40:23 +02009//config:config TUNE2FS
Denys Vlasenko4eed2c62017-07-18 22:01:24 +020010//config: bool "tune2fs (4.4 kb)"
Denys Vlasenko000eda42015-10-18 22:40:23 +020011//config: default n # off: it is too limited compared to upstream version
12//config: help
Denys Vlasenko72089cf2017-07-21 09:50:55 +020013//config: tune2fs allows the system administrator to adjust various tunable
14//config: filesystem parameters on Linux ext2/ext3 filesystems.
Denys Vlasenko000eda42015-10-18 22:40:23 +020015
16//applet:IF_TUNE2FS(APPLET(tune2fs, BB_DIR_SBIN, BB_SUID_DROP))
17
Denys Vlasenko5bbee272016-11-23 21:51:11 +010018//TODO alias to "tune2fs -L LABEL": //applet:IF_E2LABEL(APPLET_ODDNAME(e2label, tune2fs, BB_DIR_SBIN, BB_SUID_DROP, e2label))
19
Denys Vlasenko000eda42015-10-18 22:40:23 +020020//kbuild:lib-$(CONFIG_TUNE2FS) += tune2fs.o
21
22//usage:#define tune2fs_trivial_usage
23//usage: "[-c MAX_MOUNT_COUNT] "
24////usage: "[-e errors-behavior] [-g group] "
25//usage: "[-i DAYS] "
26////usage: "[-j] [-J journal-options] [-l] [-s sparse-flag] "
27////usage: "[-m reserved-blocks-percent] [-o [^]mount-options[,...]] "
28////usage: "[-r reserved-blocks-count] [-u user] "
29//usage: "[-C MOUNT_COUNT] "
30//usage: "[-L LABEL] "
31////usage: "[-M last-mounted-dir] [-O [^]feature[,...]] "
32////usage: "[-T last-check-time] [-U UUID] "
33//usage: "BLOCKDEV"
34//usage:
35//usage:#define tune2fs_full_usage "\n\n"
36//usage: "Adjust filesystem options on ext[23] filesystems"
37
Denys Vlasenko3945bc12009-10-22 00:55:55 +020038#include "libbb.h"
39#include <linux/fs.h>
Denys Vlasenko176bc342012-04-17 15:06:55 +020040#include "bb_e2fs_defs.h"
Denys Vlasenko3945bc12009-10-22 00:55:55 +020041
42// storage helpers
43char BUG_wrong_field_size(void);
44#define STORE_LE(field, value) \
45do { \
46 if (sizeof(field) == 4) \
Denys Vlasenko67743862010-05-09 00:13:40 +020047 field = SWAP_LE32(value); \
Denys Vlasenko3945bc12009-10-22 00:55:55 +020048 else if (sizeof(field) == 2) \
Denys Vlasenko67743862010-05-09 00:13:40 +020049 field = SWAP_LE16(value); \
Denys Vlasenko3945bc12009-10-22 00:55:55 +020050 else if (sizeof(field) == 1) \
51 field = (value); \
52 else \
53 BUG_wrong_field_size(); \
54} while (0)
55
56#define FETCH_LE32(field) \
Denys Vlasenko67743862010-05-09 00:13:40 +020057 (sizeof(field) == 4 ? SWAP_LE32(field) : BUG_wrong_field_size())
Denys Vlasenko3945bc12009-10-22 00:55:55 +020058
59enum {
Denys Vlasenkoe4dcba12010-10-28 18:57:19 +020060 OPT_L = 1 << 0, // label
Richard Braun5aa4d532010-10-05 00:39:46 +020061 OPT_c = 1 << 1, // max mount count
62 OPT_i = 1 << 2, // check interval
Denys Vlasenko46aa5e02011-09-11 20:08:12 +020063 OPT_C = 1 << 3, // current mount count
Denys Vlasenko3945bc12009-10-22 00:55:55 +020064};
65
66int tune2fs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
67int tune2fs_main(int argc UNUSED_PARAM, char **argv)
68{
69 unsigned opts;
Denys Vlasenko46aa5e02011-09-11 20:08:12 +020070 const char *label, *str_c, *str_i, *str_C;
Denys Vlasenko3945bc12009-10-22 00:55:55 +020071 struct ext2_super_block *sb;
72 int fd;
73
74 opt_complementary = "=1";
Denys Vlasenko46aa5e02011-09-11 20:08:12 +020075 opts = getopt32(argv, "L:c:i:C:", &label, &str_c, &str_i, &str_C);
Denys Vlasenko3945bc12009-10-22 00:55:55 +020076 if (!opts)
77 bb_show_usage();
Richard Braun5aa4d532010-10-05 00:39:46 +020078 argv += optind; // argv[0] -- device
Denys Vlasenko3945bc12009-10-22 00:55:55 +020079
80 // read superblock
81 fd = xopen(argv[0], O_RDWR);
82 xlseek(fd, 1024, SEEK_SET);
83 sb = xzalloc(1024);
84 xread(fd, sb, 1024);
85
86 // mangle superblock
87 //STORE_LE(sb->s_wtime, time(NULL)); - why bother?
Richard Braun5aa4d532010-10-05 00:39:46 +020088
Denys Vlasenko46aa5e02011-09-11 20:08:12 +020089 if (opts & OPT_C) {
90 int n = xatoi_range(str_C, 1, 0xfffe);
91 STORE_LE(sb->s_mnt_count, (unsigned)n);
92 }
93
Denys Vlasenko3945bc12009-10-22 00:55:55 +020094 // set the label
Richard Braun5aa4d532010-10-05 00:39:46 +020095 if (opts & OPT_L)
Denys Vlasenko3945bc12009-10-22 00:55:55 +020096 safe_strncpy((char *)sb->s_volume_name, label, sizeof(sb->s_volume_name));
Richard Braun5aa4d532010-10-05 00:39:46 +020097
98 if (opts & OPT_c) {
99 int n = xatoi_range(str_c, -1, 0xfffe);
100 if (n == 0)
101 n = -1;
102 STORE_LE(sb->s_max_mnt_count, (unsigned)n);
103 }
104
105 if (opts & OPT_i) {
106 unsigned n = xatou_range(str_i, 0, (unsigned)0xffffffff / (24*60*60)) * 24*60*60;
107 STORE_LE(sb->s_checkinterval, n);
108 }
109
Denys Vlasenko3945bc12009-10-22 00:55:55 +0200110 // write superblock
111 xlseek(fd, 1024, SEEK_SET);
112 xwrite(fd, sb, 1024);
113
114 if (ENABLE_FEATURE_CLEAN_UP) {
115 free(sb);
116 }
117
118 xclose(fd);
119 return EXIT_SUCCESS;
120}