From 0b7cd1e751f70cf6b335754d2b173d9c12b674c7 Mon Sep 17 00:00:00 2001
From: Jamie Liu <jamieliu@google.com>
Date: Fri, 7 Aug 2020 16:33:37 -0700
Subject: Mark dropped pages unevictable in fsimpl/gofer.dentry.destroyLocked.

PiperOrigin-RevId: 325531657
---
 pkg/sentry/fsimpl/gofer/gofer.go | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/pkg/sentry/fsimpl/gofer/gofer.go b/pkg/sentry/fsimpl/gofer/gofer.go
index f1d3bf911..4ac8dd81d 100644
--- a/pkg/sentry/fsimpl/gofer/gofer.go
+++ b/pkg/sentry/fsimpl/gofer/gofer.go
@@ -1264,8 +1264,11 @@ func (d *dentry) destroyLocked(ctx context.Context) {
 		}
 	}
 	// Discard cached data.
-	d.cache.DropAll(mf)
-	d.dirty.RemoveAll()
+	if !d.cache.IsEmpty() {
+		mf.MarkAllUnevictable(d)
+		d.cache.DropAll(mf)
+		d.dirty.RemoveAll()
+	}
 	d.dataMu.Unlock()
 	// Clunk open fids and close open host FDs.
 	if !d.readFile.isNil() {
-- 
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