tune2fs: move to e2fsprogs

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

3 files changed, 78 insertions, 7 deletions

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;
+}