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// Copyright 2020 the Go-FUSE Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package fs
import (
"context"
"fmt"
"os"
"path/filepath"
"sync"
"sync/atomic"
"syscall"
"testing"
"time"
"github.com/hanwen/go-fuse/v2/fuse"
"github.com/hanwen/go-fuse/v2/internal/testutil"
)
type allChildrenNode struct {
Inode
depth int
}
var _ = (NodeLookuper)((*allChildrenNode)(nil))
var _ = (NodeReaddirer)((*allChildrenNode)(nil))
func (n *allChildrenNode) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (*Inode, syscall.Errno) {
if n.depth == 0 {
return nil, syscall.ENOENT
}
stable := StableAttr{
Mode: syscall.S_IFDIR,
}
if n.depth == 1 {
stable.Mode = syscall.S_IFREG
}
childFN := &allChildrenNode{
depth: n.depth - 1,
}
child := n.NewInode(ctx, childFN, stable)
return child, 0
}
func (n *allChildrenNode) Readdir(ctx context.Context) (DirStream, syscall.Errno) {
var list []fuse.DirEntry
var m uint32 = syscall.S_IFDIR
if n.depth == 1 {
m = syscall.S_IFREG
}
for i := 0; i < 100; i++ {
list = append(list, fuse.DirEntry{
Name: fmt.Sprintf("%d", i),
Mode: m,
})
}
return NewListDirStream(list), 0
}
func TestForget(t *testing.T) {
if os.Geteuid() != 0 {
t.Skip("must run test as root")
}
root := &allChildrenNode{
depth: 2,
}
ttl := 10 * time.Millisecond
options := &Options{
FirstAutomaticIno: 1,
EntryTimeout: &ttl,
}
options.Debug = testutil.VerboseTest()
dir := t.TempDir()
rawFS := NewNodeFS(root, options)
server, err := fuse.NewServer(rawFS, dir, &options.MountOptions)
if err != nil {
t.Fatal(err)
}
defer server.Unmount()
go server.Serve()
if err := server.WaitMount(); err != nil {
t.Fatal(err)
}
nop := func(path string, info os.FileInfo, err error) error {
return nil
}
if err := filepath.Walk(dir, nop); err != nil {
t.Fatal(err)
}
t.Log("dropping cache")
if err := os.WriteFile("/proc/sys/vm/drop_caches", []byte("2"), 0644); err != nil {
}
time.Sleep(ttl)
bridge := rawFS.(*rawBridge)
bridge.mu.Lock()
l := len(bridge.kernelNodeIds)
bridge.mu.Unlock()
if l != 1 {
t.Fatalf("got %d live nodes, want 1", l)
}
}
type forgetTestRootNode struct {
Inode
mu sync.Mutex
onForgetCount uint32
fileNode *forgetTestSubNode
dirNode *forgetTestSubNode
}
func (n *forgetTestRootNode) OnForget() {
atomic.AddUint32(&n.onForgetCount, 1)
}
type forgetTestSubNode struct {
Inode
root *forgetTestRootNode
}
func (n *forgetTestSubNode) OnForget() {
n.root.OnForget()
}
func (n *forgetTestSubNode) OnAdd(ctx context.Context) {
if !n.IsDir() {
return
}
ftn := &forgetTestSubNode{root: n.root}
ch := n.NewPersistentInode(ctx,
ftn,
StableAttr{Mode: fuse.S_IFREG})
n.root.mu.Lock()
defer n.root.mu.Unlock()
n.root.dirNode = n
n.root.fileNode = ftn
n.AddChild("child", ch, true)
}
func (n *forgetTestRootNode) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (*Inode, syscall.Errno) {
if name != "subdir" {
return nil, syscall.ENOENT
}
if ch := n.GetChild(name); ch != nil {
return ch, 0
}
ftn := &forgetTestSubNode{root: n}
ch := n.NewInode(ctx, ftn,
StableAttr{Mode: fuse.S_IFDIR})
return ch, 0
}
func TestOnForget(t *testing.T) {
root := &forgetTestRootNode{}
mnt, srv := testMount(t, root, nil)
sub := mnt + "/subdir"
_, err := os.Stat(sub)
if err != nil {
t.Fatal(err)
}
root.mu.Lock()
if root.dirNode == nil {
t.Fatal("Lookup not triggered")
}
if root.fileNode == nil {
t.Fatal("OnAdd not triggered")
}
root.mu.Unlock()
if root.dirNode.GetChild("child") == nil {
t.Fatal("child not there")
}
if err := syscall.Rmdir(sub); err != nil {
t.Fatal(err)
}
if root.GetChild("subdir") != nil {
t.Fatal("rmdir left node")
}
// The kernel issues FORGET immediately, but it takes a bit to
// process the request.
time.Sleep(time.Millisecond)
if got := atomic.LoadUint32(&root.onForgetCount); got != 0 {
t.Errorf("got count %d, want 0", got)
}
root.fileNode.ForgetPersistent()
if got := atomic.LoadUint32(&root.onForgetCount); got != 2 {
t.Errorf("got count %d, want 2", got)
}
if err := srv.Unmount(); err != nil {
t.Errorf("Unmount: %v", err)
}
if got := atomic.LoadUint32(&root.onForgetCount); got != 3 {
t.Errorf("got count %d, want 3", got)
}
}
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