sys/vm/vnode_pager.c

257 		object->un_pager.vnp.writemappings = 0;
317 	if (object->un_pager.vnp.writemappings > 0) {
318 		object->un_pager.vnp.writemappings = 0;
1539 	old_wm = object->un_pager.vnp.writemappings;
1540 	object->un_pager.vnp.writemappings += (vm_ooffset_t)end - start;
1542 	if (old_wm == 0 && object->un_pager.vnp.writemappings != 0) {
1547 	} else if (old_wm != 0 && object->un_pager.vnp.writemappings == 0) {
1576 	 * Optimize for the case when writemappings is not going to
1580 	if (object->un_pager.vnp.writemappings != inc) {
1581 		object->un_pager.vnp.writemappings -= inc;
1594 	 * Decrement the object's writemappings, by swapping the start