[LTP] [PATCH 28/29] 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/hugemmap32.c  | 104 ++++++++++++++++++
 3 files changed, 106 insertions(+)
 create mode 100644 testcases/kernel/mem/hugetlb/hugemmap/hugemmap32.c

diff --git a/runtest/hugetlb b/runtest/hugetlb
index 32d22dd88..2088df636 100644
--- a/runtest/hugetlb
+++ b/runtest/hugetlb
@@ -32,6 +32,7 @@ hugemmap28 hugemmap28
 hugemmap29 hugemmap29
 hugemmap30 hugemmap30
 hugemmap31 hugemmap31
+hugemmap32 hugemmap32
 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 8375389cd..81b9f547c 100644
--- a/testcases/kernel/mem/.gitignore
+++ b/testcases/kernel/mem/.gitignore
@@ -31,6 +31,7 @@
 /hugetlb/hugemmap/hugemmap29
 /hugetlb/hugemmap/hugemmap30
 /hugetlb/hugemmap/hugemmap31
+/hugetlb/hugemmap/hugemmap32
 /hugetlb/hugeshmat/hugeshmat01
 /hugetlb/hugeshmat/hugeshmat02
 /hugetlb/hugeshmat/hugeshmat03
diff --git a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap32.c b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap32.c
new file mode 100644
index 000000000..e40e351da
--- /dev/null
+++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap32.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * Copyright (C) 2005-2006 David Gibson & Adam Litke, IBM Corporation.
+ *
+ * Test Name: Shared Mapping
+ *
+ * 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?
+ *
+ * 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 <setjmp.h>
+#include <sys/types.h>
+
+#include "hugetlb.h"
+
+#define RANDOM_CONSTANT	0x1234ABCD
+
+static char *verbose;
+static char hfile[MAXPATHLEN];
+static long hpage_size;
+static int fd = -1;
+
+static void run_test(void)
+{
+	void *p, *q;
+	unsigned long *pl, *ql;
+	unsigned long i;
+
+	fd = SAFE_OPEN(hfile, O_RDWR | O_CREAT, 0600);
+	SAFE_UNLINK(hfile);
+
+	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");
+			goto fail;
+		}
+	}
+
+	tst_res(TPASS, "Successful");
+	SAFE_MUNMAP(p, hpage_size);
+	SAFE_MUNMAP(q, hpage_size);
+	SAFE_CLOSE(fd);
+	return;
+
+fail:
+	tst_brk(TBROK, "Once failed, No point in continuing the test");
+}
+
+static void setup(void)
+{
+	if (tst_hugepages < 2)
+		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[]) {
+		{"v", &verbose, "Turns on verbose mode"},
+		{"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 = {2, TST_REQUEST},
+};
-- 
2.31.1


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