[LTP] [PATCH v1 10/10] syscalls/ioctl_loop08: Add LOOP_SET/GET_STATUS64 sizelimit field test

[Yang Xu]

Test its lo_sizelimit field. If lo_sizelimit is 0,it means max
available. If sizelimit is less than loop_size, loopsize will
be truncated.

Signed-off-by: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
---
 runtest/syscalls                              |  1 +
 testcases/kernel/syscalls/ioctl/.gitignore    |  1 +
 .../kernel/syscalls/ioctl/ioctl_loop08.c      | 96 +++++++++++++++++++
 3 files changed, 98 insertions(+)
 create mode 100644 testcases/kernel/syscalls/ioctl/ioctl_loop08.c

diff --git a/runtest/syscalls b/runtest/syscalls
index 0e4dbaa77..d88848cb9 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -534,6 +534,7 @@ ioctl_loop04 ioctl_loop04
 ioctl_loop05 ioctl_loop05
 ioctl_loop06 ioctl_loop06
 ioctl_loop07 ioctl_loop07
+ioctl_loop08 ioctl_loop08
 
 ioctl_ns01 ioctl_ns01
 ioctl_ns02 ioctl_ns02
diff --git a/testcases/kernel/syscalls/ioctl/.gitignore b/testcases/kernel/syscalls/ioctl/.gitignore
index 3a3d49adc..97134aa0b 100644
--- a/testcases/kernel/syscalls/ioctl/.gitignore
+++ b/testcases/kernel/syscalls/ioctl/.gitignore
@@ -13,6 +13,7 @@
 /ioctl_loop05
 /ioctl_loop06
 /ioctl_loop07
+/ioctl_loop08
 /ioctl_ns01
 /ioctl_ns02
 /ioctl_ns03
diff --git a/testcases/kernel/syscalls/ioctl/ioctl_loop08.c b/testcases/kernel/syscalls/ioctl/ioctl_loop08.c
new file mode 100644
index 000000000..37e6c02b3
--- /dev/null
+++ b/testcases/kernel/syscalls/ioctl/ioctl_loop08.c
@@ -0,0 +1,96 @@
+// 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 LOOP_SET_STATUS64
+ * and LOOP_GET_STATUS64.
+ * Test its lo_sizelimit field. If lo_sizelimit is 0,it means max
+ * available. If sizelimit is less than loop_size, loopsize will
+ * be truncated.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <stdlib.h>
+#include "ioctl_loop_support.h"
+#include "lapi/loop.h"
+#include "tst_test.h"
+
+static char dev_path[1024], sys_loop_sizepath[1024], sys_loop_sizelimitpath[1024];
+static int dev_num, dev_fd, file_fd, attach_flag;
+
+static struct tcase {
+	unsigned int set_sizelimit;
+	unsigned int exp_loopsize;
+	char *message;
+} tcases[] = {
+	{1024 * 4096, 2048, "When sizelimit is greater than loopsize "},
+	{1024 * 512, 1024, "When sizelimit is less than loopsize"},
+};
+
+static void verify_ioctl_loop(unsigned int n)
+{
+	struct tcase *tc = &tcases[n];
+	struct loop_info64 loopinfo, loopinfoget;
+
+	tst_res(TINFO, "%s", tc->message);
+	memset(&loopinfo, 0, sizeof(loopinfo));
+	memset(&loopinfoget, 0, sizeof(loopinfoget));
+
+	loopinfo.lo_sizelimit = tc->set_sizelimit;
+	safe_set_status64(dev_fd, loopinfo);
+
+	check_sys_value(sys_loop_sizepath, tc->exp_loopsize);
+	check_sys_value(sys_loop_sizelimitpath, tc->set_sizelimit);
+	SAFE_IOCTL(dev_fd, LOOP_GET_STATUS64, &loopinfoget);
+	if (loopinfoget.lo_sizelimit == tc->set_sizelimit)
+		tst_res(TPASS, "LOOP_GET_STATUS64 gets correct lo_sizelimit(%d)", tc->set_sizelimit);
+	else
+		tst_res(TFAIL, "LOOP_GET_STATUS64 gets wrong lo_sizelimit(%llu), expect %d",
+				loopinfoget.lo_sizelimit, tc->set_sizelimit);
+	/*Reset*/
+	loopinfo.lo_sizelimit = 0;
+	safe_set_status64(dev_fd, loopinfo);
+}
+
+static void setup(void)
+{
+	dev_num = tst_find_free_loopdev(dev_path, sizeof(dev_path));
+	if (dev_num < 0)
+		tst_brk(TBROK, "Failed to find free loop device");
+
+	tst_fill_file("test.img", 0, 1024, 1024);
+	tst_attach_device(dev_path, "test.img");
+	attach_flag = 1;
+
+	sprintf(sys_loop_sizepath, "/sys/block/loop%d/size", dev_num);
+	sprintf(sys_loop_sizelimitpath, "/sys/block/loop%d/loop/sizelimit", dev_num);
+
+	dev_fd = SAFE_OPEN(dev_path, O_RDWR);
+	tst_res(TINFO, "original loop size 2048 sectors");
+}
+
+static void cleanup(void)
+{
+	if (dev_fd > 0)
+		SAFE_CLOSE(dev_fd);
+	if (file_fd > 0)
+		SAFE_CLOSE(file_fd);
+	if (attach_flag)
+		tst_detach_device(dev_path);
+}
+
+static struct tst_test test = {
+	.setup = setup,
+	.cleanup = cleanup,
+	.test = verify_ioctl_loop,
+	.tcnt = ARRAY_SIZE(tcases),
+	.needs_root = 1,
+	.needs_tmpdir = 1,
+	.needs_drivers = (const char *const []) {
+		"loop",
+		NULL
+	}
+};
-- 
2.23.0