On Mon, Jan 14, 2019 at 10:21 AM cgxu519 <cgxu519@xxxxxxx> wrote: [...] > > Do we gain anything (simplicity? relaxed locking order) if we always > > copy up metadata on open O_RDWR and only delay data copy up > > until first write/page fault? > > > > Chengguang, > > > > For your use case, is it acceptable if we copy up metadata > > (and parents) before first write? > > In our use case that will be fine if copy up metadata(and parents) is > quick enough. > Chengguang, I posted an RFC patch (sorry forgot to CC you). It seems to be working as expected short of the mmap case, but I only tested manually - have not written any tests yet. You may test the RFC patch and let me know if it meets the requirements of your use case. Thanks, Amir.
