[LTP] [PATCH] syscalls/statx01: Add exit condition when parsing /proc/self/mountinfo

[Richard Palethorpe]

Hello,

Yang Xu <xuyang2018.jy@fujitsu.com> writes:

> When using user filesystem such as overlayfs, the current parsing way can't
> work well.
>
> 63 66 8:3 / /sysroot rw,relatime - ext4 /dev/sda3 rw,seclabel
> 43 66 8:3 /ostree/deploy/rhivos/var /var rw,relatime shared:3 - ext4 /dev/sda3 rw,seclabel
>
> So add the exit condition for statx.mnt_id check so it can skip the
> underflying filesystem and parse the correct user fileystem's mnt_id.
>
> Fixes: #1001
> Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
> ---
>  testcases/kernel/syscalls/statx/statx01.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/testcases/kernel/syscalls/statx/statx01.c b/testcases/kernel/syscalls/statx/statx01.c
> index 60b50958b..931aa60c1 100644
> --- a/testcases/kernel/syscalls/statx/statx01.c
> +++ b/testcases/kernel/syscalls/statx/statx01.c
> @@ -68,7 +68,8 @@ static void test_mnt_id(struct statx *buf)
>  		if (sscanf(line, "%"SCNu64" %*d %d:%d", &mnt_id, &line_mjr, &line_mnr) != 3)
>  			continue;
>  
> -		if (line_mjr == buf->stx_dev_major && line_mnr == buf->stx_dev_minor)
> +		if (line_mjr == buf->stx_dev_major && line_mnr == buf->stx_dev_minor &&
> +				mnt_id == buf->stx_mnt_id)

The fail message after this point doesn't make sense with this change.

	if (buf->stx_mnt_id == mnt_id)
		tst_res(TPASS,
			"statx.stx_mnt_id equals to mount_id(%"PRIu64") in /proc/self/mountinfo",
			mnt_id);
	else
		tst_res(TFAIL,
			"statx.stx_mnt_id(%"PRIu64") is different from mount_id(%"PRIu64") in /proc/self/mountinfo",
			(uint64_t)buf->stx_mnt_id, mnt_id);

It'll print whatever the last mnt_id is which is probably unrelated.

-- 
Thank you,
Richard.