[Ocfs2-tools-devel] [PATCH 13/20] tunefs.ocfs2: Add enable discontig-bg operations.

[Tao Ma]

This patch just adds the support for enable discontig-bg
in tunefs.ocfs2 so that we can test it easily.

XXX:
Do we need to change the bg_size for all the suballocator
group so that it is consistent when new group is allocated?

Signed-off-by: Tao Ma <tao.ma at oracle.com>
---
 tunefs.ocfs2/Makefile               |    1 +
 tunefs.ocfs2/feature_discontig_bg.c |   83 +++++++++++++++++++++++++++++++++++
 tunefs.ocfs2/op_features.c          |    2 +
 3 files changed, 86 insertions(+), 0 deletions(-)
 create mode 100644 tunefs.ocfs2/feature_discontig_bg.c

diff --git a/tunefs.ocfs2/Makefile b/tunefs.ocfs2/Makefile
index 6219af6..1871136 100644
--- a/tunefs.ocfs2/Makefile
+++ b/tunefs.ocfs2/Makefile
@@ -18,6 +18,7 @@ UNINST_LIBRARIES = libocfs2ne.a
 
 OCFS2NE_FEATURES =			\
 	feature_backup_super		\
+	feature_discontig_bg		\
 	feature_extended_slotmap	\
 	feature_inline_data		\
 	feature_local			\
diff --git a/tunefs.ocfs2/feature_discontig_bg.c b/tunefs.ocfs2/feature_discontig_bg.c
new file mode 100644
index 0000000..caba0d9
--- /dev/null
+++ b/tunefs.ocfs2/feature_discontig_bg.c
@@ -0,0 +1,83 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * feature_discontig_alloc.c
+ *
+ * ocfs2 tune utility for enabling and disabling the discontig_alloc feature.
+ *
+ * Copyright (C) 2010 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 <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <ctype.h>
+#include <inttypes.h>
+#include <assert.h>
+
+#include "ocfs2/ocfs2.h"
+
+#include "libocfs2ne.h"
+
+static int enable_discontig_bg(ocfs2_filesys *fs, int flags)
+{
+	errcode_t ret = 0;
+	struct ocfs2_super_block *super = OCFS2_RAW_SB(fs->fs_super);
+	struct tools_progress *prog;
+
+	if (ocfs2_supports_discontig_bg(super)) {
+		verbosef(VL_APP,
+			 "Discontiguous block group feature is already enabled;"
+			 " nothing to enable\n");
+		goto out;
+	}
+
+	if (!tools_interact("Enable the discontiguous block group feature on "
+			    "device \"%s\"? ",
+			    fs->fs_devname))
+		goto out;
+
+	prog = tools_progress_start("Enable discontig block group",
+				    "discontig bg", 1);
+	if (!prog) {
+		ret = TUNEFS_ET_NO_MEMORY;
+		tcom_err(ret, "while initializing the progress display");
+		goto out;
+	}
+
+	OCFS2_SET_INCOMPAT_FEATURE(super, OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG);
+	tunefs_block_signals();
+	ret = ocfs2_write_super(fs);
+	tunefs_unblock_signals();
+	if (ret)
+		tcom_err(ret, "while writing out the superblock");
+
+	tools_progress_step(prog, 1);
+	tools_progress_stop(prog);
+out:
+	return ret;
+}
+
+DEFINE_TUNEFS_FEATURE_INCOMPAT(discontig_bg,
+			       OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG,
+			       TUNEFS_FLAG_RW | TUNEFS_FLAG_ALLOCATION |
+			       TUNEFS_FLAG_LARGECACHE,
+			       enable_discontig_bg,
+			       NULL);
+
+#ifdef DEBUG_EXE
+int main(int argc, char *argv[])
+{
+	return tunefs_feature_main(argc, argv, &discontig_bg_feature);
+}
+#endif
diff --git a/tunefs.ocfs2/op_features.c b/tunefs.ocfs2/op_features.c
index 613ea7e..2ad0623 100644
--- a/tunefs.ocfs2/op_features.c
+++ b/tunefs.ocfs2/op_features.c
@@ -45,6 +45,7 @@ extern struct tunefs_feature usrquota_feature;
 extern struct tunefs_feature grpquota_feature;
 extern struct tunefs_feature refcount_feature;
 extern struct tunefs_feature indexed_dirs_feature;
+extern struct tunefs_feature discontig_bg_feature;
 
 /* List of features supported by ocfs2ne */
 static struct tunefs_feature *features[] = {
@@ -60,6 +61,7 @@ static struct tunefs_feature *features[] = {
 	&grpquota_feature,
 	&refcount_feature,
 	&indexed_dirs_feature,
+	&discontig_bg_feature,
 	NULL,
 };
 
-- 
1.5.5