Merge 216da0b7 (automated)

1 files changed, 57 insertions, 0 deletions

diff --git a/pkg/sentry/mm/save_restore.go b/pkg/sentry/mm/save_restore.go
new file mode 100644
index 000000000..0385957bd
--- /dev/null
+++ b/pkg/sentry/mm/save_restore.go
@@ -0,0 +1,57 @@
+// Copyright 2018 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package mm
+
+import (
+	"fmt"
+
+	"gvisor.googlesource.com/gvisor/pkg/sentry/context"
+)
+
+// InvalidateUnsavable invokes memmap.Mappable.InvalidateUnsavable on all
+// Mappables mapped by mm.
+func (mm *MemoryManager) InvalidateUnsavable(ctx context.Context) error {
+	mm.mappingMu.RLock()
+	defer mm.mappingMu.RUnlock()
+	for vseg := mm.vmas.FirstSegment(); vseg.Ok(); vseg = vseg.NextSegment() {
+		if vma := vseg.ValuePtr(); vma.mappable != nil {
+			if err := vma.mappable.InvalidateUnsavable(ctx); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// beforeSave is invoked by stateify.
+func (mm *MemoryManager) beforeSave() {
+	mf := mm.mfp.MemoryFile()
+	for pseg := mm.pmas.FirstSegment(); pseg.Ok(); pseg = pseg.NextSegment() {
+		if pma := pseg.ValuePtr(); pma.file != mf {
+			// InvalidateUnsavable should have caused all such pmas to be
+			// invalidated.
+			panic(fmt.Sprintf("Can't save pma %#v with non-MemoryFile of type %T:\n%s", pseg.Range(), pma.file, mm))
+		}
+	}
+}
+
+// afterLoad is invoked by stateify.
+func (mm *MemoryManager) afterLoad() {
+	mm.haveASIO = mm.p.SupportsAddressSpaceIO()
+	mf := mm.mfp.MemoryFile()
+	for pseg := mm.pmas.FirstSegment(); pseg.Ok(); pseg = pseg.NextSegment() {
+		pseg.ValuePtr().file = mf
+	}
+}