[LTP] [PATCH] syscalls: Check for leftover partition info in loopdev ioctl tests

[Cyril Hrubis]

Hi!
> Due to a kernel bug, successful ioctl09 and ioctl_loop01 test runs
> sometimes leave behind stale partition info on the loop device they used,
> which then causes mkfs.vfat to fail in later tests. Check that partition
> info was properly removed in cleanup.
> 
> Signed-off-by: Martin Doucha <mdoucha@suse.cz>
> ---
> 
> This does not fix the mkfs.vfat failures but it makes the true cause visible.
> We could add a workaround for the mkfs.vfat failures by simply initializing
> the loop device with the LO_FLAGS_PARTSCAN flag by default, or at least when
> stale partition info is found by tst_find_free_loopdev().

I guess that it would be cleaner to put the stale partition info
detection into the loop library. We can print a warning there and then
do the workaround.

Also do we want to add a regression test for the stale partition info?
Should be easy enough. Or at least add the hash of the kernel commit
that fixed it to the ioctl tests?

>  testcases/kernel/syscalls/ioctl/ioctl09.c      | 12 +++++++++++-
>  testcases/kernel/syscalls/ioctl/ioctl_loop01.c |  6 ++++++
>  2 files changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/testcases/kernel/syscalls/ioctl/ioctl09.c b/testcases/kernel/syscalls/ioctl/ioctl09.c
> index 9728ecb9c..09867a5c5 100644
> --- a/testcases/kernel/syscalls/ioctl/ioctl09.c
> +++ b/testcases/kernel/syscalls/ioctl/ioctl09.c
> @@ -19,7 +19,7 @@
>         ({ value ? TST_RETVAL_EQ0(x) : TST_RETVAL_NOTNULL(x); })
>  
>  static char dev_path[1024];
> -static int dev_num, attach_flag, dev_fd;
> +static int dev_num = -1, attach_flag, dev_fd;
>  static char loop_partpath[1026], sys_loop_partpath[1026];
>  
>  static void change_partition(const char *const cmd[])
> @@ -102,6 +102,16 @@ static void cleanup(void)
>  		SAFE_CLOSE(dev_fd);
>  	if (attach_flag)
>  		tst_detach_device(dev_path);
> +
> +	if (dev_num < 0)
> +		return;
> +
> +	sprintf(sys_loop_partpath, "/sys/block/loop%d/loop%dp1", dev_num,
> +		dev_num);
> +	sprintf(loop_partpath, "%sp1", dev_path);
> +
> +	if (!access(sys_loop_partpath, F_OK) || !access(loop_partpath, F_OK))
> +		tst_res(TWARN, "Partition info was not cleared from loop dev");
>  }
>  
>  static struct tst_test test = {
> diff --git a/testcases/kernel/syscalls/ioctl/ioctl_loop01.c b/testcases/kernel/syscalls/ioctl/ioctl_loop01.c
> index 734d803d5..17168ae04 100644
> --- a/testcases/kernel/syscalls/ioctl/ioctl_loop01.c
> +++ b/testcases/kernel/syscalls/ioctl/ioctl_loop01.c
> @@ -135,6 +135,12 @@ static void cleanup(void)
>  		SAFE_CLOSE(dev_fd);
>  	if (attach_flag)
>  		tst_detach_device(dev_path);
> +
> +	if (!*sys_loop_partpath || !*loop_partpath)
> +		return;
> +
> +	if (!access(sys_loop_partpath, F_OK) || !access(loop_partpath, F_OK))
> +		tst_res(TWARN, "Partition info was not cleared from loop dev");
>  }
>  
>  static struct tst_test test = {
> -- 
> 2.35.1
> 
> 
> -- 
> Mailing list info: https://lists.linux.it/listinfo/ltp

-- 
Cyril Hrubis
chrubis@suse.cz