74 lines
2.4 KiB
Go
74 lines
2.4 KiB
Go
// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tmpfs
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import (
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"bytes"
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"testing"
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"gvisor.googlesource.com/gvisor/pkg/sentry/context"
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"gvisor.googlesource.com/gvisor/pkg/sentry/context/contexttest"
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"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
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"gvisor.googlesource.com/gvisor/pkg/sentry/platform"
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"gvisor.googlesource.com/gvisor/pkg/sentry/usage"
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"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
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)
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func newFileInode(ctx context.Context) *fs.Inode {
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m := fs.NewCachingMountSource(&Filesystem{}, fs.MountSourceFlags{})
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iops := NewInMemoryFile(ctx, usage.Tmpfs, fs.WithCurrentTime(ctx, fs.UnstableAttr{}), platform.FromContext(ctx))
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return fs.NewInode(iops, m, fs.StableAttr{
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DeviceID: tmpfsDevice.DeviceID(),
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InodeID: tmpfsDevice.NextIno(),
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BlockSize: usermem.PageSize,
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Type: fs.RegularFile,
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})
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}
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func newFile(ctx context.Context) *fs.File {
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inode := newFileInode(ctx)
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f, _ := inode.GetFile(ctx, fs.NewDirent(inode, "stub"), fs.FileFlags{Read: true, Write: true})
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return f
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}
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// Allocate once, write twice.
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func TestGrow(t *testing.T) {
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ctx := contexttest.Context(t)
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f := newFile(ctx)
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defer f.DecRef()
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abuf := bytes.Repeat([]byte{'a'}, 68)
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n, err := f.Pwritev(ctx, usermem.BytesIOSequence(abuf), 0)
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if n != int64(len(abuf)) || err != nil {
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t.Fatalf("DeprecatedPwritev got (%d, %v) want (%d, nil)", n, err, len(abuf))
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}
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bbuf := bytes.Repeat([]byte{'b'}, 856)
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n, err = f.Pwritev(ctx, usermem.BytesIOSequence(bbuf), 68)
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if n != int64(len(bbuf)) || err != nil {
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t.Fatalf("DeprecatedPwritev got (%d, %v) want (%d, nil)", n, err, len(bbuf))
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}
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rbuf := make([]byte, len(abuf)+len(bbuf))
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n, err = f.Preadv(ctx, usermem.BytesIOSequence(rbuf), 0)
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if n != int64(len(rbuf)) || err != nil {
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t.Fatalf("DeprecatedPreadv got (%d, %v) want (%d, nil)", n, err, len(rbuf))
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}
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if want := append(abuf, bbuf...); !bytes.Equal(rbuf, want) {
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t.Fatalf("Read %v, want %v", rbuf, want)
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}
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}
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