[LTP] [PATCH 5/5] Hugetlb: Migrating libhugetlbfs fallocate_basic

[Tarun Sahu]

Migrating the libhugetlbfs/testcases/fallocate_basic.c test

Test Description: It tests basic fallocate functionality in hugetlbfs.
Preallocate huge pages to a file in hugetlbfs, and then remove the pages
via hole punch.

Signed-off-by: Tarun Sahu <tsahu@linux.ibm.com>
---
 runtest/hugetlb                               |  1 +
 testcases/kernel/mem/.gitignore               |  1 +
 .../hugetlb/hugefallocate/hugefallocate02.c   | 95 +++++++++++++++++++
 3 files changed, 97 insertions(+)
 create mode 100644 testcases/kernel/mem/hugetlb/hugefallocate/hugefallocate02.c

diff --git a/runtest/hugetlb b/runtest/hugetlb
index ca92dfcff..ec1fc2515 100644
--- a/runtest/hugetlb
+++ b/runtest/hugetlb
@@ -1,4 +1,5 @@
 hugefallocate01 hugefallocate01
+hugefallocate02 hugefallocate02
 
 hugemmap01 hugemmap01
 hugemmap02 hugemmap02
diff --git a/testcases/kernel/mem/.gitignore b/testcases/kernel/mem/.gitignore
index cafdb5259..c0906f3d3 100644
--- a/testcases/kernel/mem/.gitignore
+++ b/testcases/kernel/mem/.gitignore
@@ -1,5 +1,6 @@
 /cpuset/cpuset01
 /hugetlb/hugefallocate/hugefallocate01
+/hugetlb/hugefallocate/hugefallocate02
 /hugetlb/hugemmap/hugemmap01
 /hugetlb/hugemmap/hugemmap02
 /hugetlb/hugemmap/hugemmap04
diff --git a/testcases/kernel/mem/hugetlb/hugefallocate/hugefallocate02.c b/testcases/kernel/mem/hugetlb/hugefallocate/hugefallocate02.c
new file mode 100644
index 000000000..777b5321e
--- /dev/null
+++ b/testcases/kernel/mem/hugetlb/hugefallocate/hugefallocate02.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * Copyright (C) 2015 Mike Kravetz, Oracle Corporation
+ *
+ * Test Name: fallocate_basic
+ *
+ * Test Description: It tests basic fallocate functionality in hugetlbfs.
+ * Preallocate huge pages to a file in hugetlbfs, and then remove the pages
+ * via hole punch.
+ *
+ * HISTORY
+ *  Written by Mike Kravetz
+ *
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <sys/mount.h>
+#include <limits.h>
+#include <sys/param.h>
+#include <sys/types.h>
+
+#include "hugetlb.h"
+
+#define MAX_PAGES_TO_USE 5
+#define MNTPOINT "hugetlbfs/"
+
+static int  fd = -1;
+static long hpage_size;
+
+static void run_test(void)
+{
+	int err;
+	unsigned long max_iterations;
+	unsigned long free_before, free_after;
+
+	free_before = SAFE_READ_MEMINFO(MEMINFO_HPAGE_FREE);
+	max_iterations = MIN(free_before, MAX_PAGES_TO_USE);
+
+	fd = tst_creat_unlinked(MNTPOINT);
+
+	/* First preallocate file with max_iterations pages */
+	err = fallocate(fd, 0, 0, hpage_size * max_iterations);
+	if (err) {
+		if (errno == EOPNOTSUPP)
+			tst_brk(TCONF, "fallocate() Operation is not supported");
+		tst_res(TFAIL|TERRNO, "fallocate()");
+		goto cleanup;
+	}
+
+	free_after = SAFE_READ_MEMINFO(MEMINFO_HPAGE_FREE);
+	if (free_before - free_after != max_iterations) {
+		tst_res(TFAIL, "fallocate did not preallocate %lu huge pages",
+							max_iterations);
+		goto cleanup;
+	}
+
+	/* Now punch a hole of the same size */
+	err = fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
+			0, hpage_size * max_iterations);
+	if (err) {
+		tst_res(TFAIL|TERRNO, "fallocate(FALLOC_FL_PUNCH_HOLE)");
+		goto cleanup;
+	}
+
+	free_after = SAFE_READ_MEMINFO(MEMINFO_HPAGE_FREE);
+	if (free_after != free_before) {
+		tst_res(TFAIL, "fallocate hole punch did not release %lu huge pages",
+							max_iterations);
+	} else
+		tst_res(TPASS, "Successful");
+cleanup:
+	SAFE_CLOSE(fd);
+}
+
+static void setup(void)
+{
+	hpage_size = SAFE_READ_MEMINFO(MEMINFO_HPAGE_SIZE)*1024;
+}
+
+static void cleanup(void)
+{
+	if (fd > 0)
+		SAFE_CLOSE(fd);
+}
+
+static struct tst_test test = {
+	.needs_root = 1,
+	.mntpoint = MNTPOINT,
+	.needs_hugetlbfs = 1,
+	.setup = setup,
+	.cleanup = cleanup,
+	.test_all = run_test,
+	.hugepages = {3, TST_NEEDS},
+};
-- 
2.31.1