[LTP] [PATCH] finit_module02: fix exp. errno for O_WRONLY testcase

[xuyang2018.jy@fujitsu.com]

Hi Jan
> commit 032146cda855 ("vfs: check fd has read access in
> kernel_read_file_from_fd()") changed errno back to EBADF,
> which is correct value according to man page, so tweak
> the test to expect it for kernels>= 5.15.
It seems we still can hit ETXTBSY error if we  use RDWR fd on kernels >= 
5.15.

This error existed since the following commit because of 
deny_write_access api
commit 39d637af5aa7577f655c58b9e55587566c63a0af
Author: Dmitry Kasatkin <dmitry.kasatkin@huawei.com>
Date:   Sun Oct 26 12:42:07 2014 +0200

     vfs: forbid write access when reading a file into memory

I suggest add a RDWR test and send a patch to record a ETXTBSY error( 
Since linux 4.7).

What do you think about this?

Best Regards
Yang Xu
>
> Signed-off-by: Jan Stancek<jstancek@redhat.com>
> ---
>   testcases/kernel/syscalls/finit_module/finit_module02.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/testcases/kernel/syscalls/finit_module/finit_module02.c b/testcases/kernel/syscalls/finit_module/finit_module02.c
> index 0d2bf917ea64..9b5d3563b74e 100644
> --- a/testcases/kernel/syscalls/finit_module/finit_module02.c
> +++ b/testcases/kernel/syscalls/finit_module/finit_module02.c
> @@ -52,7 +52,7 @@ static void bad_fd_setup(struct tcase *tc)
>
>   static void wo_file_setup(struct tcase *tc)
>   {
> -	if (tst_kvercmp(4, 6, 0)<  0)
> +	if (tst_kvercmp(4, 6, 0)<  0 || tst_kvercmp(5, 15, 0)>= 0)
>   		tc->exp_errno = EBADF;
>   	else
>   		tc->exp_errno = ETXTBSY;