menuconfig: transform Network Filesystems menu

Turn Network File Systems into a menuconfig so that it can be disabled at
once.

(Note: I added a "default y". If you do not like that, speak up.)
Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Steven French <sfrench@us.ibm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Eric Van Hensbergen <ericvh@hera.kernel.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/Kconfig

@@ -1547,8 +1547,20 @@ config UFS_DEBUG
 
 endmenu
 
-menu "Network File Systems"
+menuconfig NETWORK_FILESYSTEMS
+	bool "Network File Systems"
+	default y
 	depends on NET
+	---help---
+	  Say Y here to get to see options for network filesystems and
+	  filesystem-related networking code, such as NFS daemon and
+	  RPCSEC security modules.
+	  This option alone does not add any kernel code.
+
+	  If you say N, all options in this submenu will be skipped and
+	  disabled; if unsure, say Y here.
+
+if NETWORK_FILESYSTEMS
 
 config NFS_FS
 	tristate "NFS file system support"
@@ -2094,7 +2106,7 @@ config 9P_FS
 
 	  If unsure, say N.
 
-endmenu
+endif # NETWORK_FILESYSTEMS
 
 if BLOCK
 menu "Partition Types"