[Ocfs2-tools-devel] [PATCH 14/22] tunefs rework: Add feature_extended_slotmap.c

[Joel Becker]

Enables and disables the extended slotmap feature.

This is the 'extended-slotmap' key to the tunefs option '--fs-features'.

Signed-off-by: Joel Becker <joel.becker at oracle.com>
---
 tunefs.ocfs2/feature_extended_slotmap.c |  108 +++++++++++++++++++++++++++++++
 1 files changed, 108 insertions(+), 0 deletions(-)
 create mode 100644 tunefs.ocfs2/feature_extended_slotmap.c

diff --git a/tunefs.ocfs2/feature_extended_slotmap.c b/tunefs.ocfs2/feature_extended_slotmap.c
new file mode 100644
index 0000000..80eda3b
--- /dev/null
+++ b/tunefs.ocfs2/feature_extended_slotmap.c
@@ -0,0 +1,108 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * feature_extended_slotmap.c
+ *
+ * ocfs2 tune utility to enable and disable the extended slot map feature.
+ *
+ * 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 int enable_extended_slotmap(ocfs2_filesys *fs, int flags)
+{
+	errcode_t err = 0;
+	struct ocfs2_super_block *super = OCFS2_RAW_SB(fs->fs_super);
+
+	if (ocfs2_uses_extended_slot_map(super)) {
+		verbosef(VL_APP,
+			 "Extended slot map feature is already enabled; "
+			 "nothing to enable\n");
+		goto out;
+	}
+
+	if (!tunefs_interact("Enable the extended slot map feature on "
+			     "device \"%s\"? ",
+			     fs->fs_devname))
+		goto out;
+
+	OCFS2_SET_INCOMPAT_FEATURE(super,
+				   OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP);
+	tunefs_block_signals();
+	err = ocfs2_format_slot_map(fs);
+	if (!err) {
+		err = ocfs2_write_super(fs);
+		if (err)
+			tcom_err(err, "while writing out the superblock");
+	} else
+		tcom_err(err, "while formatting the extended slot map");
+	tunefs_unblock_signals();
+
+out:
+	return err;
+}
+
+static int disable_extended_slotmap(ocfs2_filesys *fs, int flags)
+{
+	errcode_t err = 0;
+	struct ocfs2_super_block *super = OCFS2_RAW_SB(fs->fs_super);
+
+	if (!ocfs2_uses_extended_slot_map(super)) {
+		verbosef(VL_APP,
+			 "Extended slot map feature is not enabled; "
+			 "nothing to disable\n");
+		goto out;
+	}
+
+	if (!tunefs_interact("Disable the extended slot map feature on "
+			     "device \"%s\"? ",
+			     fs->fs_devname))
+		goto out;
+
+	OCFS2_CLEAR_INCOMPAT_FEATURE(super,
+				     OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP);
+
+	tunefs_block_signals();
+	err = ocfs2_format_slot_map(fs);
+	if (!err) {
+		err = ocfs2_write_super(fs);
+		if (err)
+			tcom_err(err, "while writing out the superblock");
+	} else
+		tcom_err(err, "while formatting the old-style slot map");
+	tunefs_unblock_signals();
+
+out:
+	return err;
+}
+
+DEFINE_TUNEFS_FEATURE_INCOMPAT(extended_slotmap,
+			       OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP,
+			       TUNEFS_FLAG_RW | TUNEFS_FLAG_ALLOCATION,
+			       enable_extended_slotmap,
+			       disable_extended_slotmap);
+
+#ifdef DEBUG_EXE
+int main(int argc, char *argv[])
+{
+	return tunefs_feature_main(argc, argv, &extended_slotmap_feature);
+}
+#endif
-- 
1.5.6.3