svn commit: r348421 - head/sys/kern

[Konstantin Belousov]

Author: kib
Date: Thu May 30 15:04:09 2019
New Revision: 348421
URL: https://svnweb.freebsd.org/changeset/base/348421

Log:
  Silence witness warning about duplicated mutex type.
  
  The order is correct, it is nullfs vnode interlock -> lower vnode
  interlock.  vop_stdadd_writecount() is called from nullfs
  VOP_ADD_WRITECOUNT() and both take interlocks.
  
  Requested by:	markj
  Sponsored by:	The FreeBSD Foundation
  MFC after:	2 weeks

Modified:
  head/sys/kern/vfs_default.c

Modified: head/sys/kern/vfs_default.c
==============================================================================
--- head/sys/kern/vfs_default.c	Thu May 30 14:40:23 2019	(r348420)
+++ head/sys/kern/vfs_default.c	Thu May 30 15:04:09 2019	(r348421)
@@ -1113,7 +1113,7 @@ vop_stdadd_writecount(struct vop_add_writecount_args *
 	int error;
 
 	vp = ap->a_vp;
-	VI_LOCK(vp);
+	VI_LOCK_FLAGS(vp, MTX_DUPOK);
 	if (vp->v_writecount < 0) {
 		error = ETXTBSY;
 	} else {