> 	This is apparently due to smb_maperror() in
> sys/netsmb/smb_subr.c mapping the ERRnotlocked returned by the SMB
> server to EBUSY, then that getting passed back up to flock()'s caller.

This is right :)

Can you try this patch?

Index: smb_subr.c
===================================================================
RCS file: /cvsroot/src/sys/netsmb/smb_subr.c,v
retrieving revision 1.21
diff -u -p -r1.21 smb_subr.c
--- smb_subr.c	26 Feb 2005 22:39:50 -0000	1.21
+++ smb_subr.c	12 Jun 2005 15:24:26 -0000
@@ -241,7 +241,8 @@ smb_maperror(int eclass, int eno)
 		    case ERRquota:
 			return EDQUOT;
 		    case ERRnotlocked:
-			return EBUSY;
+			/* it's okay to try to unlock already unlocked file */
+			return 0;
 		    case NT_STATUS_NOTIFY_ENUM_DIR:
 			return EMSGSIZE;
 		}

Jaromir
-- 
Jaromir Dolecek <jdolecek@NetBSD.org>            http://www.NetBSD.cz/
-=- We can walk our road together if our goals are all the same;     -=-
-=- We can run alone and free if we pursue a different aim.          -=-