[PATCH] Fix error reported by nfsd which it gets ETXTBSY

ETXTBSY doesn't have a direct anaolog in NFS, so just map it to nfserr_io.

As this is the default error code this does not change the operation of nfsd. 
It only reduces logging.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/nfsd/nfsproc.c

@@ -590,6 +590,7 @@ nfserrno (int errno)
 		{ nfserr_dropit, -EAGAIN },
 		{ nfserr_dropit, -ENOMEM },
 		{ nfserr_badname, -ESRCH },
+		{ nfserr_io, -ETXTBSY },
 		{ -1, -EIO }
 	};
 	int	i;