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121 lines
3.2 KiB
C
121 lines
3.2 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* tune2fs: utility to modify EXT2 filesystem
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*
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* Busybox'ed (2009) by Vladimir Dronnikov <dronnikov@gmail.com>
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//config:config TUNE2FS
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//config: bool "tune2fs (4.4 kb)"
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//config: default n # off: it is too limited compared to upstream version
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//config: help
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//config: tune2fs allows the system administrator to adjust various tunable
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//config: filesystem parameters on Linux ext2/ext3 filesystems.
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//applet:IF_TUNE2FS(APPLET(tune2fs, BB_DIR_SBIN, BB_SUID_DROP))
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//TODO alias to "tune2fs -L LABEL": //applet:IF_E2LABEL(APPLET_ODDNAME(e2label, tune2fs, BB_DIR_SBIN, BB_SUID_DROP, e2label))
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//kbuild:lib-$(CONFIG_TUNE2FS) += tune2fs.o
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//usage:#define tune2fs_trivial_usage
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//usage: "[-c MAX_MOUNT_COUNT] "
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////usage: "[-e errors-behavior] [-g group] "
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//usage: "[-i DAYS] "
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////usage: "[-j] [-J journal-options] [-l] [-s sparse-flag] "
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////usage: "[-m reserved-blocks-percent] [-o [^]mount-options[,...]] "
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////usage: "[-r reserved-blocks-count] [-u user] "
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//usage: "[-C MOUNT_COUNT] "
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//usage: "[-L LABEL] "
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////usage: "[-M last-mounted-dir] [-O [^]feature[,...]] "
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////usage: "[-T last-check-time] [-U UUID] "
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//usage: "BLOCKDEV"
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//usage:
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//usage:#define tune2fs_full_usage "\n\n"
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//usage: "Adjust filesystem options on ext[23] filesystems"
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#include "libbb.h"
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#include <linux/fs.h>
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#include "bb_e2fs_defs.h"
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// storage helpers
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char BUG_wrong_field_size(void);
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#define STORE_LE(field, value) \
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do { \
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if (sizeof(field) == 4) \
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field = SWAP_LE32(value); \
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else if (sizeof(field) == 2) \
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field = SWAP_LE16(value); \
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else if (sizeof(field) == 1) \
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field = (value); \
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else \
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BUG_wrong_field_size(); \
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} while (0)
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#define FETCH_LE32(field) \
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(sizeof(field) == 4 ? SWAP_LE32(field) : BUG_wrong_field_size())
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enum {
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OPT_L = 1 << 0, // label
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OPT_c = 1 << 1, // max mount count
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OPT_i = 1 << 2, // check interval
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OPT_C = 1 << 3, // current mount count
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};
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int tune2fs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int tune2fs_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned opts;
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const char *label, *str_c, *str_i, *str_C;
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struct ext2_super_block *sb;
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int fd;
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opt_complementary = "=1";
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opts = getopt32(argv, "L:c:i:C:", &label, &str_c, &str_i, &str_C);
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if (!opts)
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bb_show_usage();
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argv += optind; // argv[0] -- device
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// read superblock
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fd = xopen(argv[0], O_RDWR);
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xlseek(fd, 1024, SEEK_SET);
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sb = xzalloc(1024);
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xread(fd, sb, 1024);
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// mangle superblock
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//STORE_LE(sb->s_wtime, time(NULL)); - why bother?
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if (opts & OPT_C) {
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int n = xatoi_range(str_C, 1, 0xfffe);
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STORE_LE(sb->s_mnt_count, (unsigned)n);
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}
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// set the label
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if (opts & OPT_L)
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safe_strncpy((char *)sb->s_volume_name, label, sizeof(sb->s_volume_name));
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if (opts & OPT_c) {
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int n = xatoi_range(str_c, -1, 0xfffe);
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if (n == 0)
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n = -1;
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STORE_LE(sb->s_max_mnt_count, (unsigned)n);
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}
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if (opts & OPT_i) {
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unsigned n = xatou_range(str_i, 0, (unsigned)0xffffffff / (24*60*60)) * 24*60*60;
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STORE_LE(sb->s_checkinterval, n);
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}
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// write superblock
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xlseek(fd, 1024, SEEK_SET);
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xwrite(fd, sb, 1024);
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if (ENABLE_FEATURE_CLEAN_UP) {
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free(sb);
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}
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xclose(fd);
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return EXIT_SUCCESS;
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}
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