[2725] | 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 | */
|
---|
[3621] | 9 | //config:config TUNE2FS
|
---|
| 10 | //config: bool "tune2fs"
|
---|
| 11 | //config: default n # off: it is too limited compared to upstream version
|
---|
| 12 | //config: help
|
---|
| 13 | //config: tune2fs allows the system administrator to adjust various tunable
|
---|
| 14 | //config: filesystem parameters on Linux ext2/ext3 filesystems.
|
---|
| 15 |
|
---|
| 16 | //applet:IF_TUNE2FS(APPLET(tune2fs, BB_DIR_SBIN, BB_SUID_DROP))
|
---|
| 17 |
|
---|
| 18 | //kbuild:lib-$(CONFIG_TUNE2FS) += tune2fs.o
|
---|
| 19 |
|
---|
| 20 | //usage:#define tune2fs_trivial_usage
|
---|
| 21 | //usage: "[-c MAX_MOUNT_COUNT] "
|
---|
| 22 | ////usage: "[-e errors-behavior] [-g group] "
|
---|
| 23 | //usage: "[-i DAYS] "
|
---|
| 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] "
|
---|
| 31 | //usage: "BLOCKDEV"
|
---|
| 32 | //usage:
|
---|
| 33 | //usage:#define tune2fs_full_usage "\n\n"
|
---|
| 34 | //usage: "Adjust filesystem options on ext[23] filesystems"
|
---|
| 35 |
|
---|
[2725] | 36 | #include "libbb.h"
|
---|
| 37 | #include <linux/fs.h>
|
---|
[3232] | 38 | #include "bb_e2fs_defs.h"
|
---|
[2725] | 39 |
|
---|
| 40 | // storage helpers
|
---|
| 41 | char BUG_wrong_field_size(void);
|
---|
| 42 | #define STORE_LE(field, value) \
|
---|
| 43 | do { \
|
---|
| 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) \
|
---|
| 49 | field = (value); \
|
---|
| 50 | else \
|
---|
| 51 | BUG_wrong_field_size(); \
|
---|
| 52 | } while (0)
|
---|
| 53 |
|
---|
| 54 | #define FETCH_LE32(field) \
|
---|
| 55 | (sizeof(field) == 4 ? SWAP_LE32(field) : BUG_wrong_field_size())
|
---|
| 56 |
|
---|
| 57 | enum {
|
---|
| 58 | OPT_L = 1 << 0, // label
|
---|
| 59 | OPT_c = 1 << 1, // max mount count
|
---|
| 60 | OPT_i = 1 << 2, // check interval
|
---|
[3232] | 61 | OPT_C = 1 << 3, // current mount count
|
---|
[2725] | 62 | };
|
---|
| 63 |
|
---|
| 64 | int tune2fs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 65 | int tune2fs_main(int argc UNUSED_PARAM, char **argv)
|
---|
| 66 | {
|
---|
| 67 | unsigned opts;
|
---|
[3232] | 68 | const char *label, *str_c, *str_i, *str_C;
|
---|
[2725] | 69 | struct ext2_super_block *sb;
|
---|
| 70 | int fd;
|
---|
| 71 |
|
---|
| 72 | opt_complementary = "=1";
|
---|
[3232] | 73 | opts = getopt32(argv, "L:c:i:C:", &label, &str_c, &str_i, &str_C);
|
---|
[2725] | 74 | if (!opts)
|
---|
| 75 | bb_show_usage();
|
---|
| 76 | argv += optind; // argv[0] -- device
|
---|
| 77 |
|
---|
| 78 | // read superblock
|
---|
| 79 | fd = xopen(argv[0], O_RDWR);
|
---|
| 80 | xlseek(fd, 1024, SEEK_SET);
|
---|
| 81 | sb = xzalloc(1024);
|
---|
| 82 | xread(fd, sb, 1024);
|
---|
| 83 |
|
---|
| 84 | // mangle superblock
|
---|
| 85 | //STORE_LE(sb->s_wtime, time(NULL)); - why bother?
|
---|
| 86 |
|
---|
[3232] | 87 | if (opts & OPT_C) {
|
---|
| 88 | int n = xatoi_range(str_C, 1, 0xfffe);
|
---|
| 89 | STORE_LE(sb->s_mnt_count, (unsigned)n);
|
---|
| 90 | }
|
---|
| 91 |
|
---|
[2725] | 92 | // set the label
|
---|
| 93 | if (opts & OPT_L)
|
---|
| 94 | safe_strncpy((char *)sb->s_volume_name, label, sizeof(sb->s_volume_name));
|
---|
| 95 |
|
---|
| 96 | if (opts & OPT_c) {
|
---|
| 97 | int n = xatoi_range(str_c, -1, 0xfffe);
|
---|
| 98 | if (n == 0)
|
---|
| 99 | n = -1;
|
---|
| 100 | STORE_LE(sb->s_max_mnt_count, (unsigned)n);
|
---|
| 101 | }
|
---|
| 102 |
|
---|
| 103 | if (opts & OPT_i) {
|
---|
| 104 | unsigned n = xatou_range(str_i, 0, (unsigned)0xffffffff / (24*60*60)) * 24*60*60;
|
---|
| 105 | STORE_LE(sb->s_checkinterval, n);
|
---|
| 106 | }
|
---|
| 107 |
|
---|
| 108 | // write superblock
|
---|
| 109 | xlseek(fd, 1024, SEEK_SET);
|
---|
| 110 | xwrite(fd, sb, 1024);
|
---|
| 111 |
|
---|
| 112 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
| 113 | free(sb);
|
---|
| 114 | }
|
---|
| 115 |
|
---|
| 116 | xclose(fd);
|
---|
| 117 | return EXIT_SUCCESS;
|
---|
| 118 | }
|
---|