filer: option to create file only if it is new, O_EXCL

other/java/client/src/main/proto/filer.proto

@@ -123,6 +123,7 @@ message FuseAttributes {
 message CreateEntryRequest {
     string directory = 1;
     Entry entry = 2;
+    bool o_excl = 3;
 }
 
 message CreateEntryResponse {

weed/filer2/filer.go

@@ -72,7 +72,7 @@ func (f *Filer) RollbackTransaction(ctx context.Context) error {
 	return f.store.RollbackTransaction(ctx)
 }
 
-func (f *Filer) CreateEntry(ctx context.Context, entry *Entry) error {
+func (f *Filer) CreateEntry(ctx context.Context, entry *Entry, o_excl bool) error {
 
 	if string(entry.FullPath) == "/" {
 		return nil
@@ -160,6 +160,9 @@ func (f *Filer) CreateEntry(ctx context.Context, entry *Entry) error {
 			return fmt.Errorf("insert entry %s: %v", entry.FullPath, err)
 		}
 	} else {
+		if o_excl {
+			return fmt.Errorf("EEXIST: entry %s already exists", entry.FullPath)
+		}
 		if err := f.UpdateEntry(ctx, oldEntry, entry); err != nil {
 			glog.Errorf("update entry %s: %v", entry.FullPath, err)
 			return fmt.Errorf("update entry %s: %v", entry.FullPath, err)

weed/filer2/leveldb/leveldb_store_test.go

@@ -30,7 +30,7 @@ func TestCreateAndFind(t *testing.T) {
 		},
 	}
 
-	if err := filer.CreateEntry(ctx, entry1); err != nil {
+	if err := filer.CreateEntry(ctx, entry1, false); err != nil {
 		t.Errorf("create entry %v: %v", entry1.FullPath, err)
 		return
 	}

weed/filer2/leveldb2/leveldb2_store_test.go

@@ -30,7 +30,7 @@ func TestCreateAndFind(t *testing.T) {
 		},
 	}
 
-	if err := filer.CreateEntry(ctx, entry1); err != nil {
+	if err := filer.CreateEntry(ctx, entry1, false); err != nil {
 		t.Errorf("create entry %v: %v", entry1.FullPath, err)
 		return
 	}

weed/filesys/dir.go

@@ -3,6 +3,7 @@ package filesys
 import (
 	"context"
 	"os"
+	"strings"
 	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/filer2"
@@ -123,26 +124,29 @@ func (dir *Dir) Create(ctx context.Context, req *fuse.CreateRequest,
 				TtlSec:      dir.wfs.option.TtlSec,
 			},
 		},
+		OExcl: req.Flags&fuse.OpenExclusive != 0,
 	}
-	glog.V(1).Infof("create: %v", request)
+	glog.V(1).Infof("create: %v", req.String())
 
-	if request.Entry.IsDirectory {
-		if err := dir.wfs.WithFilerClient(ctx, func(client filer_pb.SeaweedFilerClient) error {
-			if _, err := client.CreateEntry(ctx, request); err != nil {
-				glog.V(0).Infof("create %s/%s: %v", dir.Path, req.Name, err)
-				return fuse.EIO
+	if err := dir.wfs.WithFilerClient(ctx, func(client filer_pb.SeaweedFilerClient) error {
+		if _, err := client.CreateEntry(ctx, request); err != nil {
+			glog.V(0).Infof("create %s/%s: %v", dir.Path, req.Name, err)
+			if strings.Contains(err.Error(), "EEXIST") {
+				return fuse.EEXIST
 			}
-			return nil
-		}); err != nil {
-			return nil, nil, err
+			return fuse.EIO
 		}
+		return nil
+	}); err != nil {
+		return nil, nil, err
 	}
-
 	node := dir.newFile(req.Name, request.Entry)
-	file := node.(*File)
-	if !request.Entry.IsDirectory {
-		file.isOpen = true
+	if request.Entry.IsDirectory {
+		return node, nil, nil
 	}
+
+	file := node.(*File)
+	file.isOpen = true
 	fh := dir.wfs.AcquireHandle(file, req.Uid, req.Gid)
 	fh.dirtyMetadata = true
 	return file, fh, nil

weed/pb/filer.proto

@@ -123,6 +123,7 @@ message FuseAttributes {
 message CreateEntryRequest {
     string directory = 1;
     Entry entry = 2;
+    bool o_excl = 3;
 }
 
 message CreateEntryResponse {

weed/pb/filer_pb/filer.pb.go

@@ -497,6 +497,7 @@ func (m *FuseAttributes) GetSymlinkTarget() string {
 type CreateEntryRequest struct {
 	Directory string `protobuf:"bytes,1,opt,name=directory" json:"directory,omitempty"`
 	Entry     *Entry `protobuf:"bytes,2,opt,name=entry" json:"entry,omitempty"`
+	OExcl     bool   `protobuf:"varint,3,opt,name=o_excl,json=oExcl" json:"o_excl,omitempty"`
 }
 
 func (m *CreateEntryRequest) Reset()                    { *m = CreateEntryRequest{} }
@@ -518,6 +519,13 @@ func (m *CreateEntryRequest) GetEntry() *Entry {
 	return nil
 }
 
+func (m *CreateEntryRequest) GetOExcl() bool {
+	if m != nil {
+		return m.OExcl
+	}
+	return false
+}
+
 type CreateEntryResponse struct {
 }
 
@@ -1457,106 +1465,107 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("filer.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
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+	0x4f, 0x57, 0x61, 0x36, 0x56, 0x83, 0x3c, 0x88, 0x37, 0xbd, 0x80, 0xe0, 0x88, 0x3f, 0x05, 0xa9,
+	0xf1, 0x92, 0x51, 0x4e, 0x8f, 0x1a, 0xf2, 0x8f, 0x9f, 0x8f, 0xfe, 0x09, 0x00, 0x00, 0xff, 0xff,
+	0x32, 0x00, 0xf8, 0x2b, 0x07, 0x12, 0x00, 0x00,
 }

weed/server/filer_grpc_server.go

@@ -139,7 +139,7 @@ func (fs *FilerServer) CreateEntry(ctx context.Context, req *filer_pb.CreateEntr
 		FullPath: fullpath,
 		Attr:     filer2.PbToEntryAttribute(req.Entry.Attributes),
 		Chunks:   chunks,
-	})
+	}, req.OExcl)
 
 	if err == nil {
 		fs.filer.DeleteChunks(garbages)

weed/server/filer_grpc_server_rename.go

@@ -107,7 +107,7 @@ func (fs *FilerServer) moveSelfEntry(ctx context.Context, oldParent filer2.FullP
 		Attr:     entry.Attr,
 		Chunks:   entry.Chunks,
 	}
-	createErr := fs.filer.CreateEntry(ctx, newEntry)
+	createErr := fs.filer.CreateEntry(ctx, newEntry, false)
 	if createErr != nil {
 		return createErr
 	}

weed/server/filer_server_handlers_write.go

@@ -193,7 +193,7 @@ func (fs *FilerServer) updateFilerStore(ctx context.Context, r *http.Request, w
 		entry.Attr.Mime = mime.TypeByExtension(ext)
 	}
 	// glog.V(4).Infof("saving %s => %+v", path, entry)
-	if dbErr := fs.filer.CreateEntry(ctx, entry); dbErr != nil {
+	if dbErr := fs.filer.CreateEntry(ctx, entry, false); dbErr != nil {
 		fs.filer.DeleteChunks(entry.Chunks)
 		glog.V(0).Infof("failing to write %s to filer server : %v", path, dbErr)
 		writeJsonError(w, r, http.StatusInternalServerError, dbErr)

weed/server/filer_server_handlers_write_autochunk.go

@@ -176,7 +176,7 @@ func (fs *FilerServer) doAutoChunk(ctx context.Context, w http.ResponseWriter, r
 		},
 		Chunks: fileChunks,
 	}
-	if dbErr := fs.filer.CreateEntry(ctx, entry); dbErr != nil {
+	if dbErr := fs.filer.CreateEntry(ctx, entry, false); dbErr != nil {
 		fs.filer.DeleteChunks(entry.Chunks)
 		replyerr = dbErr
 		filerResult.Error = dbErr.Error()