From: mpi <mpi@openbsd.org>
Date: Sat, 23 Oct 2021 14:08:46 +0000 (+0000)
Subject: Assert that the KERNEL_LOCK() is held in vref(9).
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=57a040e7c01a07ed69121733c5e392a4a908161a;p=openbsd

Assert that the KERNEL_LOCK() is held in vref(9).

This is a guard against pushing the lock too far in UVM's vnode land.

ok beck@
---

diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
index 011e7597269..af78c42526e 100644
--- a/sys/kern/vfs_subr.c
+++ b/sys/kern/vfs_subr.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vfs_subr.c,v 1.309 2021/10/21 09:59:14 claudio Exp $	*/
+/*	$OpenBSD: vfs_subr.c,v 1.310 2021/10/23 14:08:46 mpi Exp $	*/
 /*	$NetBSD: vfs_subr.c,v 1.53 1996/04/22 01:39:13 christos Exp $	*/
 
 /*
@@ -689,6 +689,8 @@ vget(struct vnode *vp, int flags)
 void
 vref(struct vnode *vp)
 {
+	KERNEL_ASSERT_LOCKED();
+
 #ifdef DIAGNOSTIC
 	if (vp->v_usecount == 0)
 		panic("vref used where vget required");