Out of line fscache_operation_init() so that it can access internal FS-Cache
features, such as stats, in a later commit.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Reviewed-by: NSteve Dickson <steved@redhat.com>
Acked-by: NJeff Layton <jeff.layton@primarydata.com>