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Implemented Write

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This commit is contained in:
Yannick Ulrich 2023-02-19 19:00:20 +00:00
parent a8dc017a48
commit 2a8de96773
1 changed files with 61 additions and 15 deletions
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76
fuse/main.go
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@ -202,12 +202,12 @@ func (n *ITNode) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (*
return nil, syscall.ENOENT
}
type bytesFileHandle struct {
type bytesFileReadHandle struct {
content []byte
}
var _ = (fs.FileReader)((*bytesFileHandle)(nil))
var _ = (fs.FileReader)((*bytesFileReadHandle)(nil))
func (fh *bytesFileHandle) Read(ctx context.Context, dest []byte, off int64) (fuse.ReadResult, syscall.Errno) {
func (fh *bytesFileReadHandle) Read(ctx context.Context, dest []byte, off int64) (fuse.ReadResult, syscall.Errno) {
end := off + int64(len(dest))
if end > int64(len(fh.content)) {
end = int64(len(fh.content))
@ -215,32 +215,78 @@ func (fh *bytesFileHandle) Read(ctx context.Context, dest []byte, off int64) (fu
return fuse.ReadResultData(fh.content[off:end]), 0
}
type bytesFileWriteHandle struct {
content []byte
path string
}
var _ = (fs.FileWriter)((*bytesFileWriteHandle)(nil))
func (fh *bytesFileWriteHandle) Write(ctx context.Context, data []byte, off int64) (written uint32, errno syscall.Errno) {
if off != int64(len(fh.content)) {
}
fh.content = append(fh.content[:], data[:]...)
return uint32(len(data)), 0
}
var _ = (fs.FileFlusher)((*bytesFileWriteHandle)(nil))
func (fh *bytesFileWriteHandle) Flush(ctx context.Context) (errno syscall.Errno) {
fp, err := myfs.Create(fh.path, uint32(len(fh.content)))
if err != nil {
return syscall.EROFS
}
nread, err := fp.Write(fh.content)
if err != nil || nread != len(fh.content) {
return syscall.EROFS
}
return 0
}
var _ = (fs.NodeSetattrer)((*ITNode)(nil))
func (bn *ITNode) Setattr(ctx context.Context, fh fs.FileHandle, in *fuse.SetAttrIn, out *fuse.AttrOut) syscall.Errno {
out.Size = 0;
out.Mtime = 0;
return 0
}
var _ = (fs.NodeOpener)((*ITNode)(nil))
func (f *ITNode) Open(ctx context.Context, openFlags uint32) (fh fs.FileHandle, fuseFlags uint32, errno syscall.Errno) {
switch f.kind {
case 2:
// FS file
fp, err := myfs.Open(f.path)
if err != nil {
if openFlags&syscall.O_RDWR != 0 {
return nil, 0, syscall.EROFS
}
buf := make([]byte, f.self.size);
nread, err := fp.Read(buf)
if err != nil || nread != int(f.self.size) {
return nil, 0, syscall.EROFS
}
if openFlags & syscall.O_WRONLY != 0 {
fh = &bytesFileWriteHandle{
path : f.path,
content : make([]byte, 0),
}
return fh, fuse.FOPEN_DIRECT_IO, 0
} else {
fp, err := myfs.Open(f.path)
if err != nil {
return nil, 0, syscall.EROFS
}
fh = &bytesFileHandle{
content: buf,
buf := make([]byte, f.self.size);
nread, err := fp.Read(buf)
if err != nil || nread != int(f.self.size) {
return nil, 0, syscall.EROFS
}
fh = &bytesFileReadHandle{
content: buf,
}
return fh, fuse.FOPEN_DIRECT_IO, 0
}
return fh, fuse.FOPEN_DIRECT_IO, 0
case 3:
// Device file
// disallow writes
if fuseFlags&(syscall.O_RDWR|syscall.O_WRONLY) != 0 {
if openFlags&(syscall.O_RDWR|syscall.O_WRONLY) != 0 {
return nil, 0, syscall.EROFS
}
@ -251,7 +297,7 @@ func (f *ITNode) Open(ctx context.Context, openFlags uint32) (fh fs.FileHandle,
return nil, 0, syscall.EROFS
}
fh = &bytesFileHandle{
fh = &bytesFileReadHandle{
content: ans,
}
return fh, fuse.FOPEN_DIRECT_IO, 0