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// Copyright 2020 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 gofer
import (
"sync/atomic"
"testing"
"gvisor.dev/gvisor/pkg/p9"
"gvisor.dev/gvisor/pkg/sentry/contexttest"
"gvisor.dev/gvisor/pkg/sentry/pgalloc"
)
func TestDestroyIdempotent(t *testing.T) {
ctx := contexttest.Context(t)
fs := filesystem{
mfp: pgalloc.MemoryFileProviderFromContext(ctx),
opts: filesystemOptions{
// Test relies on no dentry being held in the cache.
maxCachedDentries: 0,
},
syncableDentries: make(map[*dentry]struct{}),
inoByQIDPath: make(map[uint64]uint64),
inoByKey: make(map[inoKey]uint64),
}
attr := &p9.Attr{
Mode: p9.ModeRegular,
}
mask := p9.AttrMask{
Mode: true,
Size: true,
}
parent, err := fs.newDentry(ctx, p9file{}, p9.QID{}, mask, attr)
if err != nil {
t.Fatalf("fs.newDentry(): %v", err)
}
child, err := fs.newDentry(ctx, p9file{}, p9.QID{}, mask, attr)
if err != nil {
t.Fatalf("fs.newDentry(): %v", err)
}
parent.cacheNewChildLocked(child, "child")
fs.renameMu.Lock()
defer fs.renameMu.Unlock()
child.checkCachingLocked(ctx, true /* renameMuWriteLocked */)
if got := atomic.LoadInt64(&child.refs); got != -1 {
t.Fatalf("child.refs=%d, want: -1", got)
}
// Parent will also be destroyed when child reference is removed.
if got := atomic.LoadInt64(&parent.refs); got != -1 {
t.Fatalf("parent.refs=%d, want: -1", got)
}
child.checkCachingLocked(ctx, true /* renameMuWriteLocked */)
child.checkCachingLocked(ctx, true /* renameMuWriteLocked */)
}
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