On Tue, 15 Oct 2024 at 21:17, Shakeel Butt <shakeel.butt@xxxxxxxxx> wrote: > So, any operation that the fuse server can do which can cause wait on > writeback on the folios backed by the fuse is problematic. We know about > one scenario i.e. memory allocation causing reclaim which may do the > wait on unrelated folios which may be backed by the fuse server. > > Now there are ways fuse server can shoot itself on the foot. Like sync() > syscall or accessing the folios backed by itself. The quesion is should > we really need to protect fuse from such cases? That's not the issue with sync(2). The issue is that a fuse server can deny service to an unrelated and possibly higher privilege task by blocking writeback. We really don't want that to happen. Thanks, Miklos
