linux-kernel - [PATCH v3 2/2] lib/btree.c: add testcase for in-memory b+ tree

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Date:   Thu, 18 May 2017 16:35:56 +0800
From:   Leno Hou <lenohou@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     andy.shevchenko@...il.com, akpm@...ux-foundation.org,
        Leno Hou <lenohou@...il.com>
Subject: [PATCH v3 2/2] lib/btree.c: add testcase for in-memory b+ tree

Signed-off-by: Leno Hou <lenohou@...il.com>
---
 lib/btree_test.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 lib/btree_test.c

diff --git a/lib/btree_test.c b/lib/btree_test.c
new file mode 100644
index 0000000..90d9048
--- /dev/null
+++ b/lib/btree_test.c
@@ -0,0 +1,77 @@
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/btree.h>
+#include <linux/types.h>
+
+#define NODES 24
+
+struct test_node {
+	u32 key;
+	u32 val;
+};
+
+static struct btree_head32 bh;
+static struct test_node nodes[NODES];
+
+static void init(void)
+{
+	int i;
+
+	for (i = 0; i < NODES; i++) {
+		nodes[i].key = i;
+		nodes[i].val = i;
+	}
+}
+static int __init btree_test_init(void)
+{
+	u32 key = 0;
+	u32 *val = NULL;
+	int i, rc;
+
+	pr_alert("btree testing\n");
+
+	init();
+	rc = btree_init32(&bh);
+
+	if (rc)
+		pr_alert("Unable initialize btree memory\n");
+
+	for (i = 0; i < NODES; i++) {
+		rc = btree_insert32(&bh,
+				nodes[i].key,
+				&nodes[i].val,
+				GFP_ATOMIC);
+
+		if (rc)
+			pr_alert("Unable to insert key into btree\n");
+	}
+
+	pr_alert("========================================\n");
+
+	btree_for_each_safe32(&bh, key, val) {
+		pr_alert("val %d\n", *val);
+	}
+
+	btree_remove32(&bh, 11);
+
+	pr_alert("========================================\n");
+	btree_for_each_safe32(&bh, key, val) {
+		pr_alert("val %d\n", *val);
+	}
+
+	return 0;
+}
+static void __exit btree_test_exit(void)
+{
+	pr_alert("test exit\n");
+	btree_destroy32(&bh);
+
+}
+
+module_init(btree_test_init);
+module_exit(btree_test_exit);
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("Leno Hou <lenohou@...i.com>");
+MODULE_DESCRIPTION("Simple In-memory B+ Tree test");
-- 
2.7.4