[LTP] [PATCH 17/29] Hugetlb: Migrating libhugetlbfs mlock

[Tarun Sahu <tsahu@linux.ibm.com>]

Migrating the libhugetlbfs/testcases/mlock.c test

Test Description: The test checks that mlocking hugetlb areas works
with all combinations of MAP_PRIVATE and MAP_SHARED with and without
MAP_LOCKED specified.

Signed-off-by: Tarun Sahu <tsahu@linux.ibm.com>
---
 runtest/hugetlb                               |   1 +
 testcases/kernel/mem/.gitignore               |   1 +
 .../kernel/mem/hugetlb/hugemmap/hugemmap20.c  | 108 ++++++++++++++++++
 3 files changed, 110 insertions(+)
 create mode 100644 testcases/kernel/mem/hugetlb/hugemmap/hugemmap20.c

diff --git a/runtest/hugetlb b/runtest/hugetlb
index 4da1525a7..2dffa8421 100644
--- a/runtest/hugetlb
+++ b/runtest/hugetlb
@@ -21,6 +21,7 @@ hugemmap16 hugemmap16
 hugemmap17 hugemmap17
 hugemmap18 hugemmap18
 hugemmap19 hugemmap19
+hugemmap20 hugemmap20
 hugemmap05_1 hugemmap05 -m
 hugemmap05_2 hugemmap05 -s
 hugemmap05_3 hugemmap05 -s -m
diff --git a/testcases/kernel/mem/.gitignore b/testcases/kernel/mem/.gitignore
index b6b3e5ddd..dfd372892 100644
--- a/testcases/kernel/mem/.gitignore
+++ b/testcases/kernel/mem/.gitignore
@@ -20,6 +20,7 @@
 /hugetlb/hugemmap/hugemmap17
 /hugetlb/hugemmap/hugemmap18
 /hugetlb/hugemmap/hugemmap19
+/hugetlb/hugemmap/hugemmap20
 /hugetlb/hugeshmat/hugeshmat01
 /hugetlb/hugeshmat/hugeshmat02
 /hugetlb/hugeshmat/hugeshmat03
diff --git a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap20.c b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap20.c
new file mode 100644
index 000000000..702de7de9
--- /dev/null
+++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap20.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * Copyright (C) 2005-2006 David Gibson & Adam Litke, IBM Corporation.
+ *
+ * Test Name: mlock
+ *
+ * Test Description: The test checks that mlocking hugetlb areas works
+ * with all combinations of MAP_PRIVATE and MAP_SHARED with and without
+ * MAP_LOCKED specified.
+ *
+ * HISTORY
+ *  Written by David Gibson & Adam Litke
+ *
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <sys/mount.h>
+#include <limits.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/resource.h>
+
+#include "hugetlb.h"
+
+static int  fd = -1;
+static char hfile[MAXPATHLEN];
+static unsigned long hpage_size;
+
+static void test_simple_mlock(int flags)
+{
+	void *p;
+	int ret;
+
+	fd = SAFE_OPEN(hfile, O_RDWR | O_CREAT, 0600);
+	SAFE_UNLINK(hfile);
+
+	p = SAFE_MMAP(0, hpage_size, PROT_READ|PROT_WRITE, flags, fd, 0);
+
+	/* Can't use SAFE_MLOCK, as this test requires manual check */
+	ret = mlock(p, hpage_size);
+	if (ret) {
+		tst_res(TFAIL|TERRNO, "mlock() failed (flags=%x)", flags);
+		goto fail;
+	}
+
+	ret = munlock(p, hpage_size);
+	if (ret) {
+		tst_res(TFAIL|TERRNO, "munlock() failed (flags=%x)", flags);
+		goto fail;
+	}
+	SAFE_MUNMAP(p, hpage_size);
+	SAFE_CLOSE(fd);
+	return;
+fail:
+	tst_brk(TBROK, "Once failed, No point in continuing to next iteration");
+}
+
+static void run_test(void)
+{
+	struct rlimit limit_info;
+
+	if (getrlimit(RLIMIT_MEMLOCK, &limit_info))
+		tst_res(TWARN|TERRNO, "Unable to read locked memory rlimit");
+	if (limit_info.rlim_cur < hpage_size)
+		tst_brk(TCONF, "Locked memory ulimit set below huge page size");
+
+	test_simple_mlock(MAP_PRIVATE);
+	test_simple_mlock(MAP_SHARED);
+	test_simple_mlock(MAP_PRIVATE|MAP_LOCKED);
+	test_simple_mlock(MAP_SHARED|MAP_LOCKED);
+
+	tst_res(TPASS, "Successful");
+}
+
+static void setup(void)
+{
+	if (tst_hugepages < 1)
+		tst_brk(TCONF, "Not enough hugepages for testing.");
+
+	if (!Hopt)
+		Hopt = tst_get_tmpdir();
+	SAFE_MOUNT("none", Hopt, "hugetlbfs", 0, NULL);
+
+	snprintf(hfile, sizeof(hfile), "%s/ltp_hugetlbfile%d", Hopt, getpid());
+	hpage_size = SAFE_READ_MEMINFO("Hugepagesize:")*1024;
+}
+
+static void cleanup(void)
+{
+	if (fd >= 0)
+		SAFE_CLOSE(fd);
+	umount2(Hopt, MNT_DETACH);
+}
+
+static struct tst_test test = {
+	.needs_root = 1,
+	.needs_tmpdir = 1,
+	.options = (struct tst_option[]) {
+		{"H:", &Hopt,   "Location of hugetlbfs, i.e.  -H /var/hugetlbfs"},
+		{"s:", &nr_opt, "Set the number of the been allocated hugepages"},
+		{}
+	},
+	.setup = setup,
+	.cleanup = cleanup,
+	.test_all = run_test,
+	.hugepages = {1, TST_REQUEST},
+};
-- 
2.31.1


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