116 lines
3 KiB
Go
116 lines
3 KiB
Go
package nfs
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import (
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"bytes"
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"context"
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"errors"
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"io"
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"math"
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"os"
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"github.com/willscott/go-nfs-client/nfs/xdr"
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)
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// writeStability is the level of durability requested with the write
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type writeStability uint32
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const (
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unstable writeStability = 0
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dataSync writeStability = 1
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fileSync writeStability = 2
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)
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type writeArgs struct {
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Handle []byte
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Offset uint64
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Count uint32
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How uint32
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Data []byte
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}
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func onWrite(ctx context.Context, w *response, userHandle Handler) error {
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w.errorFmt = wccDataErrorFormatter
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var req writeArgs
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if err := xdr.Read(w.req.Body, &req); err != nil {
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return &NFSStatusError{NFSStatusInval, err}
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}
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fs, path, err := userHandle.FromHandle(req.Handle)
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if err != nil {
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return &NFSStatusError{NFSStatusStale, err}
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}
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// TODO
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// if !CapabilityCheck(fs, billy.WriteCapability) {
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// return &NFSStatusError{NFSStatusROFS, os.ErrPermission}
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// }
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if len(req.Data) > math.MaxInt32 || req.Count > math.MaxInt32 {
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return &NFSStatusError{NFSStatusFBig, os.ErrInvalid}
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}
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if req.How != uint32(unstable) && req.How != uint32(dataSync) && req.How != uint32(fileSync) {
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return &NFSStatusError{NFSStatusInval, os.ErrInvalid}
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}
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// stat first for pre-op wcc.
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fullPath := fs.Join(path...)
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info, err := fs.Stat(ctx, fullPath)
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if err != nil {
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if os.IsNotExist(err) {
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return &NFSStatusError{NFSStatusNoEnt, err}
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}
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if errors.Is(err, context.DeadlineExceeded) {
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return &NFSStatusError{NFSStatusJukebox, err}
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}
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return &NFSStatusError{NFSStatusAccess, err}
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}
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if !info.Mode().IsRegular() {
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return &NFSStatusError{NFSStatusInval, os.ErrInvalid}
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}
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preOpCache := ToFileAttribute(info, fullPath).AsCache()
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// now the actual op.
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file, err := fs.OpenFile(ctx, fs.Join(path...), os.O_RDWR, info.Mode().Perm())
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if err != nil {
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return &NFSStatusError{NFSStatusAccess, err}
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}
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if req.Offset > 0 {
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if _, err := file.Seek(int64(req.Offset), io.SeekStart); err != nil {
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return &NFSStatusError{NFSStatusIO, err}
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}
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}
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end := req.Count
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if len(req.Data) < int(end) {
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end = uint32(len(req.Data))
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}
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writtenCount, err := file.Write(ctx, req.Data[:end])
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if err != nil {
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Log.Errorf("Error writing: %v", err)
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return &NFSStatusError{NFSStatusIO, err}
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}
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if err := file.Close(ctx); err != nil {
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Log.Errorf("error closing: %v", err)
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return &NFSStatusError{NFSStatusIO, err}
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}
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writer := bytes.NewBuffer([]byte{})
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if err := xdr.Write(writer, uint32(NFSStatusOk)); err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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if err := WriteWcc(writer, preOpCache, tryStat(ctx, fs, path)); err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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if err := xdr.Write(writer, uint32(writtenCount)); err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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if err := xdr.Write(writer, fileSync); err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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if err := xdr.Write(writer, w.Server.ID); err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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if err := w.Write(writer.Bytes()); err != nil {
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return &NFSStatusError{NFSStatusServerFault, err}
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}
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return nil
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}
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