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-rw-r--r--util-linux/Kbuild1
-rw-r--r--util-linux/tune2fs.c71
2 files changed, 72 insertions, 0 deletions
diff --git a/util-linux/Kbuild b/util-linux/Kbuild
index 7befe0678..dc1d1f21d 100644
--- a/util-linux/Kbuild
+++ b/util-linux/Kbuild
@@ -38,4 +38,5 @@ lib-$(CONFIG_SCRIPTREPLAY) += scriptreplay.o
lib-$(CONFIG_SETARCH) += setarch.o
lib-$(CONFIG_SWAPONOFF) += swaponoff.o
lib-$(CONFIG_SWITCH_ROOT) += switch_root.o
+lib-$(CONFIG_MKFS_EXT2) += tune2fs.o
lib-$(CONFIG_UMOUNT) += umount.o
diff --git a/util-linux/tune2fs.c b/util-linux/tune2fs.c
new file mode 100644
index 000000000..3b8f3d8ef
--- /dev/null
+++ b/util-linux/tune2fs.c
@@ -0,0 +1,71 @@
+/* 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 tarball for details.
+ */
+#include "libbb.h"
+#include <linux/fs.h>
+#include <linux/ext2_fs.h>
+#include "volume_id/volume_id_internal.h"
+
+// storage helpers
+char BUG_wrong_field_size(void);
+#define STORE_LE(field, value) \
+do { \
+ if (sizeof(field) == 4) \
+ field = cpu_to_le32(value); \
+ else if (sizeof(field) == 2) \
+ field = cpu_to_le16(value); \
+ else if (sizeof(field) == 1) \
+ field = (value); \
+ else \
+ BUG_wrong_field_size(); \
+} while (0)
+
+#define FETCH_LE32(field) \
+ (sizeof(field) == 4 ? cpu_to_le32(field) : BUG_wrong_field_size())
+
+enum {
+ OPT_L = 1 << 0, // label
+};
+
+int tune2fs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int tune2fs_main(int argc UNUSED_PARAM, char **argv)
+{
+ unsigned opts;
+ const char *label;
+ struct ext2_super_block *sb;
+ int fd;
+
+ opt_complementary = "=1";
+ opts = getopt32(argv, "L:", &label);
+ argv += optind; // argv[0] -- device
+
+ if (!opts)
+ bb_show_usage();
+
+ // 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?
+ // set the label
+ if (1 /*opts & OPT_L*/)
+ safe_strncpy((char *)sb->s_volume_name, label, sizeof(sb->s_volume_name));
+ // write superblock
+ xlseek(fd, 1024, SEEK_SET);
+ xwrite(fd, sb, 1024);
+
+ if (ENABLE_FEATURE_CLEAN_UP) {
+ free(sb);
+ }
+
+ xclose(fd);
+ return EXIT_SUCCESS;
+}