add support for UID and GID in SetInodeAttributes

conversions.go

@@ -76,6 +76,14 @@ func convertInMessage(
 		o = to
 
 		valid := fusekernel.SetattrValid(in.Valid)
+		if valid&fusekernel.SetattrUid != 0 {
+			to.Uid = &in.Uid
+		}
+
+		if valid&fusekernel.SetattrGid != 0 {
+			to.Gid = &in.Gid
+		}
+
 		if valid&fusekernel.SetattrSize != 0 {
 			to.Size = &in.Size
 		}

fuseops/ops.go

@@ -161,6 +161,8 @@ type SetInodeAttributesOp struct {
 	Handle *HandleID
 
 	// The attributes to modify, or nil for attributes that don't need a change.
+	Uid   *uint32
+	Gid   *uint32
 	Size  *uint64
 	Mode  *os.FileMode
 	Atime *time.Time