On Mon, Jun 15, 2020 at 5:13 AM Christoph Hellwig <hch@xxxxxx> wrote: > > We still need to check if the fѕ is open write, even for the low-level > helper. Is there actually a way to trigger something like this? I'm wondering if it's worth a WARN_ON_ONCE()? It doesn't sound sensible to have some kernel functionality try to write to a file it didn't open for write, and sounds like a kernel bug if this case were to ever trigger.. Linus