afs: support the CB.ProbeUuid RPC op

Add support for the CB.ProbeUuid cache manager RPC op.  This allows a modern
OpenAFS server to quickly ask if the client has been rebooted.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/afs/afs_cm.h b/fs/afs/afs_cm.h
index 5f62f3e..255f5dd 100644
--- a/fs/afs/afs_cm.h
+++ b/fs/afs/afs_cm.h
@@ -24,6 +24,7 @@
 	CBGetXStatsVersion	= 209,	/* get version of extended statistics */
 	CBGetXStats		= 210,	/* get contents of extended statistics data */
 	CBInitCallBackState3	= 213,	/* initialise callback state, version 3 */
+	CBProbeUuid		= 214,	/* check the client hasn't rebooted */
 	CBTellMeAboutYourself	= 65538, /* get client capabilities */
 };