From f1c5c5c049f0239048da64376609e69e8329e73e Mon Sep 17 00:00:00 2001
From: kib <kib@FreeBSD.org>
Date: Sun, 4 Dec 2016 13:56:15 +0000
Subject: MFC r309209: Do not enable nullfs vnode caching over nfs v4 mounts.

---
 sys/fs/nfsclient/nfs_clvfsops.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'sys/fs/nfsclient/nfs_clvfsops.c')

diff --git a/sys/fs/nfsclient/nfs_clvfsops.c b/sys/fs/nfsclient/nfs_clvfsops.c
index b8aa2fd..075981b 100644
--- a/sys/fs/nfsclient/nfs_clvfsops.c
+++ b/sys/fs/nfsclient/nfs_clvfsops.c
@@ -1201,6 +1201,8 @@ out:
 		MNT_ILOCK(mp);
 		mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_NO_IOPF |
 		    MNTK_USES_BCACHE;
+		if ((VFSTONFS(mp)->nm_flag & NFSMNT_NFSV4) != 0)
+			mp->mnt_kern_flag |= MNTK_NULL_NOCACHE;
 		MNT_IUNLOCK(mp);
 	}
 	return (error);
-- 
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