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// Copyright 2018 Google LLC
//
// 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
}
}
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