[Ocfs2-tools-devel] [PATCH 09/23] tunefs rework: Add op_reset_uuid.c

[Joel Becker]

The reset_uuid operation generates a new UUID and writes it to the ocfs2
superblock.

This is the tunefs option '-U'.

Signed-off-by: Joel Becker <joel.becker at oracle.com>
Signed-off-by: Mark Fasheh <mfasheh at suse.com>
---
 tunefs.ocfs2/op_reset_uuid.c |   79 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 79 insertions(+), 0 deletions(-)
 create mode 100644 tunefs.ocfs2/op_reset_uuid.c

diff --git a/tunefs.ocfs2/op_reset_uuid.c b/tunefs.ocfs2/op_reset_uuid.c
new file mode 100644
index 0000000..f7b705e
--- /dev/null
+++ b/tunefs.ocfs2/op_reset_uuid.c
@@ -0,0 +1,79 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * op_reset_uuid.c
+ *
+ * ocfs2 tune utility to reset the volume UUID.
+ *
+ * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <inttypes.h>
+#include <uuid/uuid.h>
+
+#include "ocfs2/ocfs2.h"
+
+#include "libocfs2ne.h"
+
+
+static errcode_t update_volume_uuid(ocfs2_filesys *fs)
+{
+	errcode_t err;
+	unsigned char new_uuid[OCFS2_VOL_UUID_LEN];
+
+	if (!tunefs_interact("Reset the volume UUID on device \"%s\"? ",
+			     fs->fs_devname))
+		return 0;
+
+	uuid_generate(new_uuid);
+	memcpy(OCFS2_RAW_SB(fs->fs_super)->s_uuid, new_uuid,
+	       OCFS2_VOL_UUID_LEN);
+
+	tunefs_block_signals();
+	err = ocfs2_write_super(fs);
+	tunefs_unblock_signals();
+
+	return err;
+}
+
+static int reset_uuid_run(struct tunefs_operation *op, ocfs2_filesys *fs,
+			  int flags)
+{
+	int rc = 0;
+	errcode_t err;
+
+	err = update_volume_uuid(fs);
+	if (err) {
+		tcom_err(err, "- unable to reset the uuid on device \"%s\"",
+			 fs->fs_devname);
+		rc = 1;
+	}
+
+	return rc;
+}
+
+
+DEFINE_TUNEFS_OP(reset_uuid,
+		 "Usage: op_reset_uuid [opts] <device>\n",
+		 TUNEFS_FLAG_RW,
+		 NULL,
+		 reset_uuid_run);
+
+#ifdef DEBUG_EXE
+int main(int argc, char *argv[])
+{
+	return tunefs_op_main(argc, argv, &reset_uuid_op);
+}
+#endif
-- 
1.5.6.3