[LTP] [PATCH v2] ioctl_loop06: Check for unsupported LOOP_SET_BLOCK_SIZE ioctl

[Martin Doucha]

Loop device ioctl() returns EINVAL error if the command is not
supported. However, in compat mode, it'll return ENOTTY error
instead.

Signed-off-by: Martin Doucha <mdoucha@suse.cz>
---

Changes since v1:
- Moved check from verify_ioctl_loop() to setup()

Tested on kernels 4.12 (ioctl not supported) and 5.3 (ioctl supported).

 testcases/kernel/syscalls/ioctl/ioctl_loop06.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/testcases/kernel/syscalls/ioctl/ioctl_loop06.c b/testcases/kernel/syscalls/ioctl/ioctl_loop06.c
index 6d009af6a..64800b4ee 100644
--- a/testcases/kernel/syscalls/ioctl/ioctl_loop06.c
+++ b/testcases/kernel/syscalls/ioctl/ioctl_loop06.c
@@ -109,8 +109,9 @@ static void setup(void)
 	unalign_value = pg_size - 1;
 
 	dev_fd = SAFE_OPEN(dev_path, O_RDWR);
+	ret = ioctl(dev_fd, LOOP_SET_BLOCK_SIZE, 512);
 
-	if (ioctl(dev_fd, LOOP_SET_BLOCK_SIZE, 512) && errno == EINVAL)
+	if (ret && (errno == EINVAL || errno == ENOTTY))
 		tst_brk(TCONF, "LOOP_SET_BLOCK_SIZE is not supported");
 
 	file_fd = SAFE_OPEN("test.img", O_RDWR);
-- 
2.42.1