[Devel] [PATCH RH7] ve/sunrpc: prohibit mounting rpc_pipefs in CT without nfsd feature

[Vasily Averin]

I afraid it will not allow to mount this filesystem even in VE0

On 09/06/2018 04:18 PM, Pavel Tikhomirov wrote:
> We need rpc_pipefs for nfs server, but it breaks criu migration as
> opened /var/lib/nfs/rpc_pipefs/nfs/clntX files are not supported yet.
> Thus only allow mounting rpc_pipefs if CT has "--features nfsd:on".
> 
> https://jira.sw.ru/browse/PSBM-87836
> Signed-off-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
> ---
>  net/sunrpc/rpc_pipe.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
> index 62d442aad553..868d657e5cb2 100644
> --- a/net/sunrpc/rpc_pipe.c
> +++ b/net/sunrpc/rpc_pipe.c
> @@ -31,6 +31,9 @@
>  #include <linux/nsproxy.h>
>  #include <linux/notifier.h>
>  
> +#include <uapi/linux/vzcalluser.h>
> +#include <linux/ve.h>
> +
>  #include "netns.h"
>  #include "sunrpc.h"
>  
> @@ -1458,6 +1461,10 @@ rpc_mount(struct file_system_type *fs_type,
>  		int flags, const char *dev_name, void *data)
>  {
>  	struct net *net = current->nsproxy->net_ns;
> +
> +	if (!(get_exec_env()->features & VE_FEATURE_NFSD))
> +		return ERR_PTR(-ENODEV);
> +
>  	return mount_ns(fs_type, flags, data, net, net->user_ns, rpc_fill_super);
>  }
>  
>