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// Copyright 2019 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 (
"bytes"
"context"
"fmt"
"os"
"syscall"
"testing"
"github.com/hanwen/go-fuse/v2/fuse"
)
type dioRoot struct {
Inode
}
func (r *dioRoot) OnAdd(ctx context.Context) {
r.Inode.AddChild("file", r.Inode.NewInode(ctx, &dioFile{}, StableAttr{}), false)
}
// A file handle that pretends that every hole/data starts at
// multiples of 1024
type dioFH struct {
}
var _ = (FileLseeker)((*dioFH)(nil))
var _ = (FileReader)((*dioFH)(nil))
func (f *dioFH) Lseek(ctx context.Context, off uint64, whence uint32) (uint64, syscall.Errno) {
next := (off + 1023) & (^uint64(1023))
return next, OK
}
func (fh *dioFH) Read(ctx context.Context, data []byte, off int64) (fuse.ReadResult, syscall.Errno) {
r := bytes.Repeat([]byte(fmt.Sprintf("%010d", off)), 1+len(data)/10)
return fuse.ReadResultData(r[:len(data)]), OK
}
// overrides Open so it can return a dioFH file handle
type dioFile struct {
Inode
}
var _ = (NodeOpener)((*dioFile)(nil))
func (f *dioFile) Open(ctx context.Context, flags uint32) (fh FileHandle, fuseFlags uint32, errno syscall.Errno) {
return &dioFH{}, fuse.FOPEN_DIRECT_IO, OK
}
// this tests FOPEN_DIRECT_IO (as opposed to O_DIRECTIO)
func TestFUSEDirectIO(t *testing.T) {
root := &dioRoot{}
mntDir, server, clean := testMount(t, root, nil)
defer clean()
f, err := os.Open(mntDir + "/file")
if err != nil {
t.Fatalf("Open %v", err)
}
defer f.Close()
var buf [10]byte
n, err := f.Read(buf[:])
if err != nil {
t.Fatalf("Read %v", err)
}
want := bytes.Repeat([]byte{'0'}, 10)
got := buf[:n]
if bytes.Compare(got, want) != 0 {
t.Errorf("got %q want %q", got, want)
}
if !server.KernelSettings().SupportsVersion(7, 24) {
t.Skip("Kernel does not support lseek")
}
if n, err := syscall.Seek(int(f.Fd()), 512, _SEEK_DATA); err != nil {
t.Errorf("Seek: %v", err)
} else if n != 1024 {
t.Errorf("seek: got %d, want %d", n, 1024)
}
n, err = f.Read(buf[:])
if err != nil {
t.Fatalf("Read %v", err)
}
want = []byte(fmt.Sprintf("%010d", 1024))
got = buf[:n]
if bytes.Compare(got, want) != 0 {
t.Errorf("got %q want %q", got, want)
}
}
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