[LTP] [PATCH v2] syscalls: add syscall syncfs test

[Sumit Garg]

syncfs01 tests to sync filesystem having large dirty file pages to block
device. Also, it tests all supported filesystems on a test block device.

Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
---

Changes in v2:
1. Remove unused header file include.
2. Remove redundant tst_device check.
3. Remove redundant flags from tst_test struct.

Fixes: https://github.com/linux-test-project/ltp/issues/294

 runtest/syscalls                            |   2 +
 testcases/kernel/syscalls/syncfs/.gitignore |   1 +
 testcases/kernel/syscalls/syncfs/Makefile   |   8 +++
 testcases/kernel/syscalls/syncfs/syncfs01.c | 101 ++++++++++++++++++++++++++++
 4 files changed, 112 insertions(+)
 create mode 100644 testcases/kernel/syscalls/syncfs/.gitignore
 create mode 100644 testcases/kernel/syscalls/syncfs/Makefile
 create mode 100644 testcases/kernel/syscalls/syncfs/syncfs01.c

diff --git a/runtest/syscalls b/runtest/syscalls
index 668c87c..9442740 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -1346,6 +1346,8 @@ symlinkat01 symlinkat01
 sync01 sync01
 sync02 sync02
 
+syncfs01 syncfs01
+
 #testcases for sync_file_range
 sync_file_range01 sync_file_range01
 
diff --git a/testcases/kernel/syscalls/syncfs/.gitignore b/testcases/kernel/syscalls/syncfs/.gitignore
new file mode 100644
index 0000000..6066295
--- /dev/null
+++ b/testcases/kernel/syscalls/syncfs/.gitignore
@@ -0,0 +1 @@
+syncfs01
diff --git a/testcases/kernel/syscalls/syncfs/Makefile b/testcases/kernel/syscalls/syncfs/Makefile
new file mode 100644
index 0000000..3e6c2f4
--- /dev/null
+++ b/testcases/kernel/syscalls/syncfs/Makefile
@@ -0,0 +1,8 @@
+# Copyright (c) 2019 - Linaro Limited. All rights reserved.
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+top_srcdir             ?= ../../../..
+
+include $(top_srcdir)/include/mk/testcases.mk
+
+include $(top_srcdir)/include/mk/generic_leaf_target.mk
diff --git a/testcases/kernel/syscalls/syncfs/syncfs01.c b/testcases/kernel/syscalls/syncfs/syncfs01.c
new file mode 100644
index 0000000..e2d3e80
--- /dev/null
+++ b/testcases/kernel/syscalls/syncfs/syncfs01.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2019 Linaro Limited. All rights reserved.
+ * Author: Sumit Garg <sumit.garg@linaro.org>
+ */
+
+/*
+ * Test syncfs
+ *
+ * It basically tests syncfs() to sync filesystem having large dirty file
+ * pages to block device. Also, it tests all supported filesystems on a test
+ * block device.
+ */
+
+#define _GNU_SOURCE
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include "tst_test.h"
+#include "lapi/fs.h"
+#include "lapi/stat.h"
+
+#define MNTPOINT		"mnt_point"
+#define TST_FILE		MNTPOINT"/test"
+#define TST_FILE_SIZE_MB	32
+#define SIZE_MB			(1024*1024)
+#define MODE			0644
+
+static char dev_stat_path[1024];
+static char *buffer;
+static int fd;
+
+static void verify_syncfs(void)
+{
+	char nwrite_sec_val[BUFSIZ];
+	int counter;
+	unsigned long prev_write_sec = 0, write_sec = 0;
+
+	SAFE_FILE_SCANF(dev_stat_path, "%*s %*s %*s %*s %*s %*s %s",
+			nwrite_sec_val);
+
+	prev_write_sec = SAFE_STRTOUL(nwrite_sec_val, 0, ULONG_MAX);
+
+	fd =  SAFE_OPEN(TST_FILE, O_RDWR|O_CREAT, MODE);
+
+	/* Filling the test file */
+	for (counter = 0; counter < TST_FILE_SIZE_MB; counter++)
+		SAFE_WRITE(1, fd, buffer, SIZE_MB);
+
+	TEST(syncfs(fd));
+	if (TST_RET != 0)
+		tst_brk(TFAIL | TTERRNO, "syncfs(fd) failed");
+
+	SAFE_FILE_SCANF(dev_stat_path, "%*s %*s %*s %*s %*s %*s %s",
+			nwrite_sec_val);
+
+	write_sec = SAFE_STRTOUL(nwrite_sec_val, 0, ULONG_MAX);
+
+	if ((write_sec - prev_write_sec) * 512 >=
+	    (TST_FILE_SIZE_MB * SIZE_MB))
+		tst_res(TPASS, "Test filesystem synced to device");
+	else
+		tst_res(TFAIL, "Failed to sync test filesystem to device");
+
+	SAFE_CLOSE(fd);
+}
+
+static void setup(void)
+{
+	struct stat st;
+
+	snprintf(dev_stat_path, sizeof(dev_stat_path), "/sys/block/%s/stat",
+		 strrchr(tst_device->dev, '/') + 1);
+
+	if (stat(dev_stat_path, &st) != 0)
+		tst_brk(TCONF, "Test device stat file: %s not found",
+			dev_stat_path);
+
+	buffer = SAFE_MALLOC(SIZE_MB);
+
+	memset(buffer, 0, SIZE_MB);
+}
+
+static void cleanup(void)
+{
+	if (buffer)
+		free(buffer);
+
+	if (fd > 0)
+		SAFE_CLOSE(fd);
+}
+
+static struct tst_test test = {
+	.needs_root = 1,
+	.mount_device = 1,
+	.all_filesystems = 1,
+	.mntpoint = MNTPOINT,
+	.setup = setup,
+	.cleanup = cleanup,
+	.test_all = verify_syncfs,
+};
-- 
2.7.4