From cbc055dc2b1cfdea16ae557780a9476b566899fe Mon Sep 17 00:00:00 2001
From: chrislu <chris.lu@gmail.com>
Date: Mon, 10 Jan 2022 00:52:16 -0800
Subject: [PATCH] mount: file fsync

fix https://github.com/chrislusf/seaweedfs/issues/2561
---
 weed/filesys/dir_rename.go |  2 ++
 weed/filesys/file.go       |  5 +++--
 weed/filesys/wfs.go        | 22 ++++++++++++++++++++++
 3 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/weed/filesys/dir_rename.go b/weed/filesys/dir_rename.go
index f28c8af92..a18ed8243 100644
--- a/weed/filesys/dir_rename.go
+++ b/weed/filesys/dir_rename.go
@@ -114,7 +114,9 @@ func (dir *Dir) handleRenameResponse(ctx context.Context, resp *filer_pb.StreamR
 		if existingHandle, found := dir.wfs.handles[inodeId]; found && existingHandle != nil {
 			glog.V(4).Infof("opened file handle %s => %s", oldPath, newPath)
 			delete(dir.wfs.handles, inodeId)
+			existingHandle.handle = newPath.AsInode()
 			existingHandle.f.entry.Name = newName
+			existingHandle.f.id = newPath.AsInode()
 			dir.wfs.handles[newPath.AsInode()] = existingHandle
 		}
 		dir.wfs.handlesLock.Unlock()
diff --git a/weed/filesys/file.go b/weed/filesys/file.go
index c7652843c..244ed38ea 100644
--- a/weed/filesys/file.go
+++ b/weed/filesys/file.go
@@ -248,11 +248,12 @@ func (file *File) Listxattr(ctx context.Context, req *fuse.ListxattrRequest, res
 }
 
 func (file *File) Fsync(ctx context.Context, req *fuse.FsyncRequest) error {
-	// fsync works at OS level
+
 	// write the file chunks to the filerGrpcAddress
 	glog.V(4).Infof("%s/%s fsync file %+v", file.dir.FullPath(), file.Name, req)
 
-	return nil
+	return file.wfs.Fsync(file, req.Header)
+
 }
 
 func (file *File) Forget() {
diff --git a/weed/filesys/wfs.go b/weed/filesys/wfs.go
index 127c160c4..c9a7ac0a1 100644
--- a/weed/filesys/wfs.go
+++ b/weed/filesys/wfs.go
@@ -179,6 +179,28 @@ func (wfs *WFS) AcquireHandle(file *File, uid, gid uint32) (fileHandle *FileHand
 	return
 }
 
+func (wfs *WFS) Fsync(file *File, header fuse.Header) error {
+
+	inodeId := file.Id()
+
+	wfs.handlesLock.Lock()
+	existingHandle, found := wfs.handles[inodeId]
+	wfs.handlesLock.Unlock()
+
+	if found && existingHandle != nil && existingHandle.f.isOpen > 0 {
+
+		existingHandle.Add(1)
+		defer existingHandle.Done()
+
+		existingHandle.Lock()
+		defer existingHandle.Unlock()
+
+		return existingHandle.doFlush(context.Background(), header)
+	}
+
+	return nil
+}
+
 func (wfs *WFS) ReleaseHandle(fullpath util.FullPath, handleId fuse.HandleID) {
 	wfs.handlesLock.Lock()
 	defer wfs.handlesLock.Unlock()