svn commit: r300622 - head/sys/vm

[Konstantin Belousov]

Author: kib
Date: Tue May 24 19:20:30 2016
New Revision: 300622
URL: https://svnweb.freebsd.org/changeset/base/300622

Log:
  In vm_page_cache(), only drop the vnode after radix insert failure
  for empty page cache when the object type if OBJT_VNODE.
  
  Reported and tested by:	pho
  Reviewed by:	alc
  Sponsored by:	The FreeBSD Foundation
  MFC after:	1 week

Modified:
  head/sys/vm/vm_page.c

Modified: head/sys/vm/vm_page.c
==============================================================================
--- head/sys/vm/vm_page.c	Tue May 24 18:53:06 2016	(r300621)
+++ head/sys/vm/vm_page.c	Tue May 24 19:20:30 2016	(r300622)
@@ -3290,7 +3290,8 @@ vm_page_cache(vm_page_t m)
 	cache_was_empty = vm_radix_is_empty(&object->cache);
 	if (vm_radix_insert(&object->cache, m)) {
 		mtx_unlock(&vm_page_queue_free_mtx);
-		if (object->resident_page_count == 0)
+		if (object->type == OBJT_VNODE &&
+		    object->resident_page_count == 0)
 			vdrop(object->handle);
 		m->object = NULL;
 		vm_page_free(m);