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// 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 tmpfs
import (
"bytes"
"testing"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/sentry/fs"
"gvisor.dev/gvisor/pkg/sentry/kernel/contexttest"
"gvisor.dev/gvisor/pkg/sentry/usage"
"gvisor.dev/gvisor/pkg/usermem"
)
func newFileInode(ctx context.Context) *fs.Inode {
m := fs.NewCachingMountSource(ctx, &Filesystem{}, fs.MountSourceFlags{})
iops := NewInMemoryFile(ctx, usage.Tmpfs, fs.WithCurrentTime(ctx, fs.UnstableAttr{}))
return fs.NewInode(ctx, iops, m, fs.StableAttr{
DeviceID: tmpfsDevice.DeviceID(),
InodeID: tmpfsDevice.NextIno(),
BlockSize: usermem.PageSize,
Type: fs.RegularFile,
})
}
func newFile(ctx context.Context) *fs.File {
inode := newFileInode(ctx)
f, _ := inode.GetFile(ctx, fs.NewDirent(ctx, inode, "stub"), fs.FileFlags{Read: true, Write: true})
return f
}
// Allocate once, write twice.
func TestGrow(t *testing.T) {
ctx := contexttest.Context(t)
f := newFile(ctx)
defer f.DecRef(ctx)
abuf := bytes.Repeat([]byte{'a'}, 68)
n, err := f.Pwritev(ctx, usermem.BytesIOSequence(abuf), 0)
if n != int64(len(abuf)) || err != nil {
t.Fatalf("Pwritev got (%d, %v) want (%d, nil)", n, err, len(abuf))
}
bbuf := bytes.Repeat([]byte{'b'}, 856)
n, err = f.Pwritev(ctx, usermem.BytesIOSequence(bbuf), 68)
if n != int64(len(bbuf)) || err != nil {
t.Fatalf("Pwritev got (%d, %v) want (%d, nil)", n, err, len(bbuf))
}
rbuf := make([]byte, len(abuf)+len(bbuf))
n, err = f.Preadv(ctx, usermem.BytesIOSequence(rbuf), 0)
if n != int64(len(rbuf)) || err != nil {
t.Fatalf("Preadv got (%d, %v) want (%d, nil)", n, err, len(rbuf))
}
if want := append(abuf, bbuf...); !bytes.Equal(rbuf, want) {
t.Fatalf("Read %v, want %v", rbuf, want)
}
}
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