[PATCH] selftests/filesystems:fix build error in overlayfs

[Andrei Vagin]

On Thu, Jan 11, 2024 at 11:45 PM Hu Yadi <hu.yadi at h3c.com> wrote:
>
> One build issue comes up due to both mount.h included dev_in_maps.c
>
> In file included from dev_in_maps.c:10:
> /usr/include/sys/mount.h:35:3: error: expected identifier before numeric constant
>    35 |   MS_RDONLY = 1,  /* Mount read-only.  */
>       |   ^~~~~~~~~
> In file included from dev_in_maps.c:13:
>
> Remove one of them to solve conflict, another error comes up:
>
> dev_in_maps.c:170:6: error: implicit declaration of function ‘mount’ [-Werror=implicit-function-declaration]
>   170 |  if (mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL) == -1) {
>       |      ^~~~~
> cc1: all warnings being treated as errors
>
> and then , add sys_mount definition to solve it
> After both above, dev_in_maps.c can be built correctly on my mache(gcc 10.2,glibc-2.32,kernel-5.10)
>
> Signed-off-by: Hu Yadi <hu.yadi at h3c.com>
Acked-by: Andrei Vagin <avagin at google.com>