[LTP] [PATCH v5 6/7] Hugetlb: Migrating libhugetlbfs fallocate_align

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

Migrating the libhugetlbfs/testcases/fallocate_align.c test

Test Description: It tests alignment of fallocate arguments. fallocate will
take non-huge page aligned offsets and addresses.  However, operations are
only performed on huge pages.  This is different that than fallocate
behavior in "normal" filesystems.

Signed-off-by: Tarun Sahu <tsahu@linux.ibm.com>
---
 runtest/hugetlb                               |   2 +
 testcases/kernel/mem/.gitignore               |   1 +
 .../kernel/mem/hugetlb/hugefallocate/Makefile |  10 ++
 .../hugetlb/hugefallocate/hugefallocate01.c   | 169 ++++++++++++++++++
 4 files changed, 182 insertions(+)
 create mode 100644 testcases/kernel/mem/hugetlb/hugefallocate/Makefile
 create mode 100644 testcases/kernel/mem/hugetlb/hugefallocate/hugefallocate01.c

diff --git a/runtest/hugetlb b/runtest/hugetlb
index b019c4195..ca92dfcff 100644
--- a/runtest/hugetlb
+++ b/runtest/hugetlb
@@ -1,3 +1,5 @@
+hugefallocate01 hugefallocate01
+
 hugemmap01 hugemmap01
 hugemmap02 hugemmap02
 hugemmap04 hugemmap04
diff --git a/testcases/kernel/mem/.gitignore b/testcases/kernel/mem/.gitignore
index ec250592d..cafdb5259 100644
--- a/testcases/kernel/mem/.gitignore
+++ b/testcases/kernel/mem/.gitignore
@@ -1,4 +1,5 @@
 /cpuset/cpuset01
+/hugetlb/hugefallocate/hugefallocate01
 /hugetlb/hugemmap/hugemmap01
 /hugetlb/hugemmap/hugemmap02
 /hugetlb/hugemmap/hugemmap04
diff --git a/testcases/kernel/mem/hugetlb/hugefallocate/Makefile b/testcases/kernel/mem/hugetlb/hugefallocate/Makefile
new file mode 100644
index 000000000..77ebb0aef
--- /dev/null
+++ b/testcases/kernel/mem/hugetlb/hugefallocate/Makefile
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (C) 2009, Cisco Systems Inc.
+# Ngie Cooper, July 2009
+
+top_srcdir		?= ../../../../..
+
+include $(top_srcdir)/include/mk/testcases.mk
+include $(abs_srcdir)/../Makefile.inc
+include $(top_srcdir)/include/mk/generic_leaf_target.mk
+
diff --git a/testcases/kernel/mem/hugetlb/hugefallocate/hugefallocate01.c b/testcases/kernel/mem/hugetlb/hugefallocate/hugefallocate01.c
new file mode 100644
index 000000000..1ec0dd000
--- /dev/null
+++ b/testcases/kernel/mem/hugetlb/hugefallocate/hugefallocate01.c
@@ -0,0 +1,169 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * Copyright (C) 2015 Oracle Corporation
+ * Author: Mike Kravetz
+ */
+
+/*\
+ * [Description]
+ *
+ * It tests alignment of fallocate arguments. fallocate will take non-huge
+ * page aligned offsets and addresses.  However, operations are only
+ * performed on huge pages.  This is different that than fallocate
+ * behavior in "normal" filesystems.
+ *
+ */
+
+#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 MNTPOINT "hugetlbfs/"
+
+static int  fd = -1;
+static long hpage_size;
+
+static void run_test(void)
+{
+	int err;
+	unsigned long free_initial, free_after, free_after_delete;
+
+	fd = tst_creat_unlinked(MNTPOINT, 0);
+
+	free_initial = SAFE_READ_MEMINFO(MEMINFO_HPAGE_FREE);
+
+	/*
+	 * First preallocate file with just 1 byte.  Allocation sizes
+	 * are rounded up, so we should get an entire huge page.
+	 */
+	err = fallocate(fd, 0, 0, 1);
+	if (err) {
+		if (errno == EOPNOTSUPP)
+			tst_brk(TCONF, "Operation Not Supported");
+		tst_res(TFAIL|TERRNO, "fallocate()");
+		goto cleanup;
+	}
+
+	free_after = SAFE_READ_MEMINFO(MEMINFO_HPAGE_FREE);
+	if (free_initial - free_after != 1) {
+		tst_res(TFAIL, "fallocate 1 byte did not preallocate entire huge page");
+		goto cleanup;
+	}
+
+	/*
+	 * Now punch a hole with just 1 byte.  On hole punch, sizes are
+	 * rounded down. So, this operation should not create a hole.
+	 */
+	err = fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
+			0, 1);
+	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_initial) {
+		tst_res(TFAIL, "fallocate hole punch 1 byte free'ed a huge page");
+		goto cleanup;
+	}
+
+	/*
+	 * Now punch a hole with of 2 * hpage_size - 1 byte.  This size
+	 * should be rounded down to a single huge page and the hole created.
+	 */
+	err = fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
+			0, (2 * hpage_size) - 1);
+	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_initial) {
+		tst_res(TFAIL, "fallocate hole punch 2 * hpage_size - 1 byte did not"
+				" free huge page");
+		goto cleanup;
+	}
+
+	/*
+	 * Perform a preallocate operation with offset 1 and size of
+	 * hpage_size.  The offset should be rounded down and the
+	 * size rounded up to preallocate two huge pages.
+	 */
+	err = fallocate(fd, 0, 1, hpage_size);
+	if (err) {
+		tst_res(TFAIL, "fallocate()");
+		goto cleanup;
+	}
+
+	free_after = SAFE_READ_MEMINFO(MEMINFO_HPAGE_FREE);
+	if (free_initial - free_after != 2) {
+		tst_res(TFAIL, "fallocate 1 byte offset, huge page size did not"
+				" preallocate two huge pages");
+		goto cleanup;
+	}
+
+	/*
+	 * The hole punch code will only delete 'whole' huge pags that are
+	 * in the specified range.  The offset is rounded up, and (offset
+	 * + size) is rounded down to determine the huge pages to be deleted.
+	 * In this case, after rounding the range is (hpage_size, hpage_size).
+	 * So, no pages should be deleted.
+	 */
+	err = fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
+			1, hpage_size);
+	if (err) {
+		tst_res(TFAIL|TERRNO, "fallocate(FALLOC_FL_PUNCH_HOLE)");
+		goto cleanup;
+	}
+
+	free_after = SAFE_READ_MEMINFO(MEMINFO_HPAGE_FREE);
+	if (free_initial - free_after != 2) {
+		tst_res(TFAIL, "fallocate hole punch 1 byte offset, huge page size"
+				" incorrectly deleted a huge page");
+		goto cleanup;
+	}
+
+	/*
+	 * To delete both huge pages, the range passed to hole punch must
+	 * overlap the allocated pages
+	 */
+	err = fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
+			0, 2 * hpage_size);
+	if (err) {
+		tst_res(TFAIL|TERRNO, "fallocate(FALLOC_FL_PUNCH_HOLE)");
+		goto cleanup;
+	}
+
+	free_after_delete = SAFE_READ_MEMINFO(MEMINFO_HPAGE_FREE);
+	TST_EXP_EQ_LU(free_after_delete, free_initial);
+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,
+	.needs_tmpdir = 1,
+	.setup = setup,
+	.cleanup = cleanup,
+	.test_all = run_test,
+	.hugepages = {2, TST_NEEDS},
+};
-- 
2.31.1


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