On Fri, Aug 11, 2017 at 08:57:18PM -0700, Andy Lutomirski wrote: > One thing that makes me quite nervous about S_IOMAP_IMMUTABLE is the > degree to which things go badly if one program relies on it while > another program clears the flag: you risk corrupting unrelated > filesystem metadata. I think a userspace interface to pin the extent > mapping of a file really wants a way to reliably keep it pinned (or to > reliably zap the userspace application if it gets unpinned). The nice thing is that no application can rely on it anyway..
