[CRIU] [PATCH RFC 0/2] Get rid of statfs system calls

[Stanislav Kinsburskiy]

NFS client migration development revealed, that each statfs call send requests
to server side, when the network has been locked already.
Statfs system call is used only for one purpose: get file system type of the
mount, file belongs to, while all the rest fields are ignored.
The idea if this series is simple and stright-forward: do not call statfs for
NFS, but return NFS_SUPER_MAGIC value, stored on fstype object of mountinfo in
"fs_magic" field.
Looks like this approach can be used for any file system instead of using
statfs() system call.