Comment 9 for bug 248743

No (upstream) version of gnome-vfs supports locking, as far as I know. Locking on opening (GNOME_VFS_OPEN_LOCKED) and an implementation of it for for the SMB method in particular (relevant there as the SMB protocol has the "share mode" feature, like Windows) exists only in SUSE's build of gnome-vfs AFAIK. Unfortunately this feature has not been upstreamed, and by now it is too late I guess as gnome-vfs is deprecated. Other distros are free to adopt the same feature of course.