D44217.diff
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	diff --git a/sys/fs/nullfs/null_vfsops.c b/sys/fs/nullfs/null_vfsops.c
	--- a/sys/fs/nullfs/null_vfsops.c
	+++ b/sys/fs/nullfs/null_vfsops.c
	@@ -46,6 +46,7 @@
	#include <sys/mount.h>
	#include <sys/namei.h>
	#include <sys/proc.h>
	+#include <sys/sysctl.h>
	#include <sys/vnode.h>
	#include <sys/jail.h>

	@@ -63,6 +64,13 @@
	static vfs_vget_t nullfs_vget;
	static vfs_extattrctl_t nullfs_extattrctl;

	+SYSCTL_NODE(_vfs, OID_AUTO, nullfs, CTLFLAG_RW, 0, "nullfs");
	+
	+static bool null_cache_vnodes = true;
	+SYSCTL_BOOL(_vfs_nullfs, OID_AUTO, cache_vnodes, CTLFLAG_RWTUN,
	+ &null_cache_vnodes, 0,
	+ "cache free nullfs vnodes");
	+
	/*
	* Mount null layer
	*/
	@@ -198,7 +206,8 @@
	}

	xmp->nullm_flags \|= NULLM_CACHE;
	- if (vfs_getopt(mp->mnt_optnew, "nocache", NULL, NULL) == 0 \|\|
	+ if (!null_cache_vnodes \|\|
	+ vfs_getopt(mp->mnt_optnew, "nocache", NULL, NULL) == 0 \|\|
	(xmp->nullm_vfs->mnt_kern_flag & MNTK_NULL_NOCACHE) != 0)
	xmp->nullm_flags &= ~NULLM_CACHE;