NFS: Permit local filesystem caching to be enabled for NFS

Permit local filesystem caching to be enabled for NFS in the kernel
configuration.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Steve Dickson <steved@redhat.com>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Tested-by: Daire Byrne <Daire.Byrne@framestore.com>

fs/nfs/Kconfig

@@ -84,3 +84,11 @@ config ROOT_NFS
 	  <file:Documentation/filesystems/nfsroot.txt>.
 
 	  Most people say N here.
+
+config NFS_FSCACHE
+	bool "Provide NFS client caching support (EXPERIMENTAL)"
+	depends on EXPERIMENTAL
+	depends on NFS_FS=m && FSCACHE || NFS_FS=y && FSCACHE=y
+	help
+	  Say Y here if you want NFS data to be cached locally on disc through
+	  the general filesystem cache manager