Am Sa., 24. Juli 2021 um 03:53 Uhr schrieb Al Viro <viro@xxxxxxxxxxxxxxxxxx>: > On Fri, Jul 23, 2021 at 10:58:34PM +0200, Andreas Gruenbacher wrote: > > Introduce a new fault_in_iov_iter helper for manually faulting in an iterator. > > Other than fault_in_pages_writeable(), this function is non-destructive. > > > > We'll use fault_in_iov_iter in gfs2 once we've determined that the iterator > > passed to .read_iter or .write_iter isn't in memory. > > Hmm... I suspect that this is going to be much heavier for read access > than the existing variant. Do we ever want it for anything other than > writes? I don't know if it actually is slower when pages need to be faulted in, but I'm fine turning it into a write-only function. Thanks, Andreas
