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// Copyright 2018 Google Inc.
//
// 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 device
import (
"testing"
)
func TestMultiDevice(t *testing.T) {
device := &MultiDevice{}
// Check that Load fails to install virtual inodes that are
// uninitialized.
if device.Load(MultiDeviceKey{}, 0) {
t.Fatalf("got load of invalid virtual inode 0, want unsuccessful")
}
inode := device.Map(MultiDeviceKey{})
// Assert that the same raw device and inode map to
// a consistent virtual inode.
if i := device.Map(MultiDeviceKey{}); i != inode {
t.Fatalf("got inode %d, want %d in %s", i, inode, device)
}
// Assert that a new inode or new device does not conflict.
if i := device.Map(MultiDeviceKey{Device: 0, Inode: 1}); i == inode {
t.Fatalf("got reused inode %d, want new distinct inode in %s", i, device)
}
last := device.Map(MultiDeviceKey{Device: 1, Inode: 0})
if last == inode {
t.Fatalf("got reused inode %d, want new distinct inode in %s", last, device)
}
// Virtual is the virtual inode we want to load.
virtual := last + 1
// Assert that we can load a virtual inode at a new place.
if !device.Load(MultiDeviceKey{Device: 0, Inode: 2}, virtual) {
t.Fatalf("got load of virtual inode %d failed, want success in %s", virtual, device)
}
// Assert that the next inode skips over the loaded one.
if i := device.Map(MultiDeviceKey{Device: 0, Inode: 3}); i != virtual+1 {
t.Fatalf("got inode %d, want %d in %s", i, virtual+1, device)
}
}
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