svn commit: r357358 - in head/sys: kern sys

[Mateusz Guzik]

Author: mjg
Date: Sat Feb  1 06:39:49 2020
New Revision: 357358
URL: https://svnweb.freebsd.org/changeset/base/357358

Log:
  vfs: add vrefactn
  
  Differential Revision:	https://reviews.freebsd.org/D23427

Modified:
  head/sys/kern/vfs_subr.c
  head/sys/sys/vnode.h

Modified: head/sys/kern/vfs_subr.c
==============================================================================
--- head/sys/kern/vfs_subr.c	Sat Feb  1 06:39:10 2020	(r357357)
+++ head/sys/kern/vfs_subr.c	Sat Feb  1 06:39:49 2020	(r357358)
@@ -3046,6 +3046,19 @@ vrefact(struct vnode *vp)
 #endif
 }
 
+void
+vrefactn(struct vnode *vp, u_int n)
+{
+
+	CTR2(KTR_VFS, "%s: vp %p", __func__, vp);
+#ifdef INVARIANTS
+	int old = atomic_fetchadd_int(&vp->v_usecount, n);
+	VNASSERT(old > 0, vp, ("%s: wrong use count %d", __func__, old));
+#else
+	atomic_add_int(&vp->v_usecount, n);
+#endif
+}
+
 /*
  * Return reference count of a vnode.
  *

Modified: head/sys/sys/vnode.h
==============================================================================
--- head/sys/sys/vnode.h	Sat Feb  1 06:39:10 2020	(r357357)
+++ head/sys/sys/vnode.h	Sat Feb  1 06:39:49 2020	(r357358)
@@ -900,6 +900,7 @@ void	vrele(struct vnode *vp);
 void	vref(struct vnode *vp);
 void	vrefl(struct vnode *vp);
 void	vrefact(struct vnode *vp);
+void	vrefactn(struct vnode *vp, u_int n);
 int	vrefcnt(struct vnode *vp);
 void 	v_addpollinfo(struct vnode *vp);