[LTP] [PATCH v1 03/10] syscalls/ioctl_loop01: Add LO_FLAGS_AUTOCLEAR and LO_FLAGS_PARTSCAN test

[Yang Xu <xuyang2018.jy@cn.fujitsu.com>]

For LO_FLAGS_AUTOCLEAR flag, we only check autoclear fieldvalue in sys
directory and also get lo_flags by using LOOP_GET_STATUS.

For LO_FLAGS_PARTSCAN flag, it is the same as LO_FLAGS_AUTOCLEAR flag.
But we also check whether we can scan partition table correctly ie check
whether /dev/loopnp1 and /sys/bloclk/loop0/loop0p1 existed.

Signed-off-by: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
---
 runtest/syscalls                              |   3 +-
 testcases/kernel/syscalls/ioctl/.gitignore    |   1 +
 .../kernel/syscalls/ioctl/ioctl_loop01.c      | 127 ++++++++++++++++++
 3 files changed, 130 insertions(+), 1 deletion(-)
 create mode 100644 testcases/kernel/syscalls/ioctl/ioctl_loop01.c

diff --git a/runtest/syscalls b/runtest/syscalls
index 777f0ac6a..7fd67450e 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -524,10 +524,11 @@ ioctl03      ioctl03
 ioctl04      ioctl04
 ioctl05      ioctl05
 ioctl06      ioctl06
-
 ioctl07      ioctl07
 ioctl08      ioctl08
 
+ioctl_loop01 ioctl_loop01
+
 ioctl_ns01 ioctl_ns01
 ioctl_ns02 ioctl_ns02
 ioctl_ns03 ioctl_ns03
diff --git a/testcases/kernel/syscalls/ioctl/.gitignore b/testcases/kernel/syscalls/ioctl/.gitignore
index 97fbb9681..4cfef2839 100644
--- a/testcases/kernel/syscalls/ioctl/.gitignore
+++ b/testcases/kernel/syscalls/ioctl/.gitignore
@@ -6,6 +6,7 @@
 /ioctl06
 /ioctl07
 /ioctl08
+/ioctl_loop01
 /ioctl_ns01
 /ioctl_ns02
 /ioctl_ns03
diff --git a/testcases/kernel/syscalls/ioctl/ioctl_loop01.c b/testcases/kernel/syscalls/ioctl/ioctl_loop01.c
new file mode 100644
index 000000000..e806e0443
--- /dev/null
+++ b/testcases/kernel/syscalls/ioctl/ioctl_loop01.c
@@ -0,0 +1,127 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2020 FUJITSU LIMITED. All rights reserved.
+ * Author: Yang Xu <xuyang2018.jy@cn.jujitsu.com>
+ *
+ * This is a basic ioctl test about loopdevice.
+ * It is designed to test LO_FLAGS_AUTOCLEAR and LO_FLAGS_PARTSCAN flag.
+ *
+ * For LO_FLAGS_AUTOCLEAR flag, we only check autoclear fieldvalue in sys
+ * directory and also get lo_flags by using LOOP_GET_STATUS.
+ *
+ * For LO_FLAGS_PARTSCAN flag, it is the same as LO_FLAGS_AUTOCLEAR flag.
+ * But we also check whether we can scan partition table correctly ie check
+ * whether /dev/loopnp1 and /sys/bloclk/loop0/loop0p1 existed.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include "ioctl_loop_support.h"
+#include "lapi/loop.h"
+#include "tst_test.h"
+
+static char dev_path[1024], backing_path[1024], backing_file_path[1024];
+static int dev_num, attach_flag, dev_fd;
+/*
+ *In drivers/block/loop.c code, set status function doesn't handle
+ *LO_FLAGS_READ_ONLY flag and ingore it. Only loop_set_fd with rondonly
+ *mode file_fd, lo_flags will include LO_FLAGS_READ_ONLY.
+ */
+#define set_flags (LO_FLAGS_AUTOCLEAR | LO_FLAGS_PARTSCAN | LO_FLAGS_READ_ONLY | LO_FLAGS_DIRECT_IO)
+#define get_flags (LO_FLAGS_AUTOCLEAR | LO_FLAGS_PARTSCAN)
+
+static char partscan_path[1024], autoclear_path[1024];
+static char loop_partpath[1026], sys_loop_partpath[1026];
+
+static void verify_ioctl_loop(void)
+{
+	int ret;
+	struct loop_info loopinfo, loopinfoget;
+
+	tst_attach_device(dev_path, "test.img");
+	attach_flag = 1;
+
+	check_sys_value(partscan_path, 0);
+	check_sys_value(autoclear_path, 0);
+	check_sys_string(backing_path, backing_file_path);
+
+	dev_fd = SAFE_OPEN(dev_path, O_RDWR);
+	memset(&loopinfo, 0, sizeof(loopinfo));
+	memset(&loopinfo, 0, sizeof(loopinfoget));
+
+	loopinfo.lo_flags = set_flags;
+	SAFE_IOCTL(dev_fd, LOOP_SET_STATUS, &loopinfo);
+
+	SAFE_IOCTL(dev_fd, LOOP_GET_STATUS, &loopinfoget);
+
+	if (loopinfoget.lo_flags & ~get_flags)
+		tst_res(TFAIL, "expect %d but got %d", get_flags, loopinfoget.lo_flags);
+	else
+		tst_res(TPASS, "get expected lo_flag %d", loopinfoget.lo_flags);
+
+	ret = access(loop_partpath, F_OK);
+	if (ret == 0)
+		tst_res(TPASS, "access %s succeeds", loop_partpath);
+	else
+		tst_res(TFAIL, "access %s fails", loop_partpath);
+
+	ret = access(sys_loop_partpath, F_OK);
+	if (ret == 0)
+		tst_res(TPASS, "access %s succeeds", sys_loop_partpath);
+	else
+		tst_res(TFAIL, "access %s fails", sys_loop_partpath);
+
+	check_sys_value(partscan_path, 1);
+	check_sys_value(autoclear_path, 1);
+
+	SAFE_CLOSE(dev_fd);
+	tst_detach_device(dev_path);
+	attach_flag = 0;
+}
+
+static void setup(void)
+{
+	const char *const cmd_dd[] = {"dd", "if=/dev/zero", "of=test.img", "bs=1M", "count=10", NULL};
+	const char *const cmd_parted[] = {"parted", "-s", "test.img", "mklabel", "msdos", "mkpart",
+						"primary", "ext4", "1M", "10M", NULL};
+
+	dev_num = tst_find_free_loopdev(dev_path, sizeof(dev_path));
+	if (dev_num < 0)
+		tst_brk(TBROK, "Failed to find free loop device");
+
+	SAFE_CMD(cmd_dd, NULL, NULL);
+	SAFE_CMD(cmd_parted, NULL, NULL);
+
+	sprintf(partscan_path, "/sys/block/loop%d/loop/partscan", dev_num);
+	sprintf(autoclear_path, "/sys/block/loop%d/loop/autoclear", dev_num);
+	sprintf(backing_path, "/sys/block/loop%d/loop/backing_file", dev_num);
+	sprintf(sys_loop_partpath, "/sys/block/loop%d/loop%dp1", dev_num, dev_num);
+	sprintf(backing_file_path, "%s/test.img", tst_get_tmpdir());
+	sprintf(loop_partpath, "%sp1", dev_path);
+}
+
+static void cleanup(void)
+{
+	if (dev_fd > 0)
+		SAFE_CLOSE(dev_fd);
+	if (attach_flag)
+		tst_detach_device(dev_path);
+}
+
+static struct tst_test test = {
+	.setup = setup,
+	.cleanup = cleanup,
+	.test_all = verify_ioctl_loop,
+	.needs_root = 1,
+	.needs_cmds = (const char *const []) {
+		"dd",
+		"parted",
+		NULL
+	},
+	.needs_drivers = (const char *const []) {
+		"loop",
+		NULL
+	},
+	.needs_tmpdir = 1,
+};
-- 
2.23.0