code: mafs

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do not steal IO buffers with a Ref

--- a/iobuf.c

+++ b/iobuf.c

@@ -112,7 +112,7 @@

 		do{

 			p = s->back;

 			if(p->ref == 0 && p->dirties == 0 && canwlock(p)){

-				if(p->dirties > 0){

+				if(p->dirties > 0 || p->ref > 0){

 					wunlock(p);

 					goto Another;

 				}