[Ocfs2-tools-devel] [PATCH 08/24] tunefs rework: Add op_update_cluster_stack.c

[Joel Becker]

The update_cluster_stack operation modifies the ocfs2 superblock with
the current clustering configuration.

This is the tunefs option '--update-cluster-stack'.

Signed-off-by: Joel Becker <joel.becker at oracle.com>
Signed-off-by: Mark Fasheh <mfasheh at suse.com>
---
 tunefs.ocfs2/op_update_cluster_stack.c |   93 ++++++++++++++++++++++++++++++++
 1 files changed, 93 insertions(+), 0 deletions(-)
 create mode 100644 tunefs.ocfs2/op_update_cluster_stack.c

diff --git a/tunefs.ocfs2/op_update_cluster_stack.c b/tunefs.ocfs2/op_update_cluster_stack.c
new file mode 100644
index 0000000..e7d6777
--- /dev/null
+++ b/tunefs.ocfs2/op_update_cluster_stack.c
@@ -0,0 +1,93 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * op_update_cluster_stack.c
+ *
+ * ocfs2 tune utility for updating the cluster stack.
+ *
+ * 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 "ocfs2/ocfs2.h"
+
+#include "libocfs2ne.h"
+
+
+static errcode_t update_cluster(ocfs2_filesys *fs)
+{
+	errcode_t ret;
+	struct o2cb_cluster_desc desc;
+
+	if (!tunefs_interact_critical(
+		"Updating on-disk cluster information "
+		"to match the running cluster.\n"
+		"DANGER: YOU MUST BE ABSOLUTELY SURE THAT NO OTHER NODE "
+		"IS USING THIS FILESYSTEM BEFORE MODIFYING "
+		"ITS CLUSTER CONFIGURATION.\n"
+	        "Update the on-disk cluster information? "
+		))
+		return 0;
+
+	ret = o2cb_running_cluster_desc(&desc);
+	if (!ret) {
+		tunefs_block_signals();
+		ret = ocfs2_set_cluster_desc(fs, &desc);
+		tunefs_unblock_signals();
+		o2cb_free_cluster_desc(&desc);
+	}
+
+	return ret;
+}
+
+static int update_cluster_stack_run(struct tunefs_operation *op,
+				    ocfs2_filesys *fs, int flags)
+{
+	int rc = 0;
+	errcode_t err;
+
+	if (flags & TUNEFS_FLAG_NOCLUSTER) {
+		err = update_cluster(fs);
+		if (err) {
+			rc = 1;
+			tcom_err(err,
+				 "- unable to update the cluster stack "
+				 "information on device \"%s\"",
+				 fs->fs_devname);
+		}
+	} else {
+		verbosef(VL_APP,
+			 "Device \"%s\" is already configured for the "
+			 "running cluster; nothing to do\n",
+			 fs->fs_devname);
+	}
+
+	return rc;
+}
+
+
+DEFINE_TUNEFS_OP(update_cluster_stack,
+		 "Usage: op_update_cluster_stack [opts] <device>\n",
+		 TUNEFS_FLAG_RW | TUNEFS_FLAG_NOCLUSTER,
+		 NULL,
+		 update_cluster_stack_run);
+
+#ifdef DEBUG_EXE
+int main(int argc, char *argv[])
+{
+	return tunefs_op_main(argc, argv, &update_cluster_stack_op);
+}
+#endif
-- 
1.5.6.3