D22009.diff
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	Index: head/sys/kern/vfs_subr.c
	===================================================================
	--- head/sys/kern/vfs_subr.c
	+++ head/sys/kern/vfs_subr.c
	@@ -4395,6 +4395,9 @@

	CTR2(KTR_VFS, "%s: mp %p", __func__, mp);

	+ if ((mp->mnt_kern_flag & MNTK_NOMSYNC) != 0)
	+ return;
	+
	MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp) {
	obj = vp->v_object;
	if (obj != NULL && (obj->flags & OBJ_MIGHTBEDIRTY) != 0 &&
	Index: head/sys/sys/mount.h
	===================================================================
	--- head/sys/sys/mount.h
	+++ head/sys/sys/mount.h
	@@ -396,6 +396,7 @@
	#define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */
	#define MNTK_ASYNC 0x00000002 /* filtered async flag */
	#define MNTK_SOFTDEP 0x00000004 /* async disabled by softdep */
	+#define MNTK_NOMSYNC 0x00000008 /* don't do vfs_msync */
	#define MNTK_DRAINING 0x00000010 /* lock draining is happening */
	#define MNTK_REFEXPIRE 0x00000020 /* refcount expiring is happening */
	#define MNTK_EXTENDED_SHARED 0x00000040 /* Allow shared locking for more ops */