[LTP] [PATCH 11/13] Hugetlb: Migrating libhugetlbfs shared

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

Migrating the libhugetlbfs/testcases/shared.c test

Test Description: This test is basic shared mapping test. Two shared
mappings are created with same offset on a file. It checks if writing
to one mapping can be seen to other mapping or not?

Signed-off-by: Tarun Sahu <tsahu@linux.ibm.com>
---
 runtest/hugetlb                               |  1 +
 testcases/kernel/mem/.gitignore               |  1 +
 .../kernel/mem/hugetlb/hugemmap/hugemmap31.c  | 84 +++++++++++++++++++
 3 files changed, 86 insertions(+)
 create mode 100644 testcases/kernel/mem/hugetlb/hugemmap/hugemmap31.c

diff --git a/runtest/hugetlb b/runtest/hugetlb
index 60cca4eb7..33fd384b4 100644
--- a/runtest/hugetlb
+++ b/runtest/hugetlb
@@ -31,6 +31,7 @@ hugemmap27 hugemmap27
 hugemmap28 hugemmap28
 hugemmap29 hugemmap29
 hugemmap30 hugemmap30
+hugemmap31 hugemmap31
 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 bb9720452..8375389cd 100644
--- a/testcases/kernel/mem/.gitignore
+++ b/testcases/kernel/mem/.gitignore
@@ -30,6 +30,7 @@
 /hugetlb/hugemmap/hugemmap28
 /hugetlb/hugemmap/hugemmap29
 /hugetlb/hugemmap/hugemmap30
+/hugetlb/hugemmap/hugemmap31
 /hugetlb/hugeshmat/hugeshmat01
 /hugetlb/hugeshmat/hugeshmat02
 /hugetlb/hugeshmat/hugeshmat03
diff --git a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap31.c b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap31.c
new file mode 100644
index 000000000..a09905023
--- /dev/null
+++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap31.c
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * Copyright (C) 2005-2006 IBM Corporation.
+ * Author: David Gibson & Adam Litke
+ */
+
+/*\
+ * [Description]
+ *
+ * This test is basic shared mapping test. Two shared mappings are created
+ * with same offset on a file. It checks if writing to one mapping can be
+ * seen to other mapping or not?
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <sys/mount.h>
+#include <limits.h>
+#include <sys/param.h>
+#include <setjmp.h>
+#include <sys/types.h>
+
+#include "hugetlb.h"
+
+#define RANDOM_CONSTANT	0x1234ABCD
+#define MNTPOINT "hugetlbfs/"
+
+static long hpage_size;
+static int fd = -1;
+
+static void run_test(void)
+{
+	void *p, *q;
+	unsigned long *pl, *ql;
+	unsigned long i;
+
+	fd = tst_creat_unlinked(MNTPOINT, 0);
+	p = SAFE_MMAP(NULL, hpage_size, PROT_READ|PROT_WRITE, MAP_SHARED,
+		 fd, 0);
+
+	q = SAFE_MMAP(NULL, hpage_size, PROT_READ|PROT_WRITE, MAP_SHARED,
+		 fd, 0);
+
+	pl = p;
+	for (i = 0; i < (hpage_size / sizeof(*pl)); i++)
+		pl[i] = RANDOM_CONSTANT ^ i;
+
+	ql = q;
+	for (i = 0; i < (hpage_size / sizeof(*ql)); i++) {
+		if (ql[i] != (RANDOM_CONSTANT ^ i)) {
+			tst_res(TFAIL, "Mismatch at offset %lu, Got: %lu, Expected: %lu",
+					i, ql[i], RANDOM_CONSTANT ^ i);
+			goto cleanup;
+		}
+	}
+
+	tst_res(TPASS, "Successfully tested data between two shared mappings");
+cleanup:
+	SAFE_MUNMAP(p, hpage_size);
+	SAFE_MUNMAP(q, hpage_size);
+	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,
+	.needs_tmpdir = 1,
+	.setup = setup,
+	.cleanup = cleanup,
+	.test_all = run_test,
+	.hugepages = {2, TST_NEEDS},
+};
-- 
2.31.1


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