From 6774386d95cec54258f23f69bc287c99e205ebdf Mon Sep 17 00:00:00 2001
From: Denys Vlasenko <vda.linux@googlemail.com>
Date: Sun, 9 May 2010 00:13:40 +0200
Subject: tune2fs: move to e2fsprogs

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
 e2fsprogs/Config.in | 12 ++++-----
 e2fsprogs/Kbuild    |  3 ++-
 e2fsprogs/tune2fs.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 78 insertions(+), 7 deletions(-)
 create mode 100644 e2fsprogs/tune2fs.c

(limited to 'e2fsprogs')

diff --git a/e2fsprogs/Config.in b/e2fsprogs/Config.in
index 9a0088ab5..964d08e4c 100644
--- a/e2fsprogs/Config.in
+++ b/e2fsprogs/Config.in
@@ -41,12 +41,12 @@ config LSATTR
 ###	  mke2fs is used to create an ext2/ext3 filesystem. The normal compat
 ###	  symlinks 'mkfs.ext2' and 'mkfs.ext3' are also provided.
 
-### config TUNE2FS
-###	bool "tune2fs"
-###	default n
-###	help
-###	  tune2fs allows the system administrator to adjust various tunable
-###	  filesystem parameters on Linux ext2/ext3 filesystems.
+config TUNE2FS
+	bool "tune2fs"
+	default n
+	help
+	  tune2fs allows the system administrator to adjust various tunable
+	  filesystem parameters on Linux ext2/ext3 filesystems.
 
 ### config E2LABEL
 ###	bool "e2label"
diff --git a/e2fsprogs/Kbuild b/e2fsprogs/Kbuild
index 9f58ce092..0fdc9d215 100644
--- a/e2fsprogs/Kbuild
+++ b/e2fsprogs/Kbuild
@@ -9,4 +9,5 @@ lib-y:=
 lib-$(CONFIG_CHATTR) += chattr.o e2fs_lib.o
 lib-$(CONFIG_LSATTR) += lsattr.o e2fs_lib.o
 
-lib-$(CONFIG_FSCK) += fsck.o
+lib-$(CONFIG_FSCK)    += fsck.o
+lib-$(CONFIG_TUNE2FS) += tune2fs.o
diff --git a/e2fsprogs/tune2fs.c b/e2fsprogs/tune2fs.c
new file mode 100644
index 000000000..00ede4f1e
--- /dev/null
+++ b/e2fsprogs/tune2fs.c
@@ -0,0 +1,70 @@
+/* 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>
+
+// 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
+};
+
+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;
+}
-- 
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