Re: Do we need to unrevert "fs: do not prefault sys_write() user buffer pages"?

David Howells
2021-06-22T18:13:10Z

Matthew Wilcox <willy@infradead.org> wrote:

> > It may also cause the read in to happen in the background whilst write_begin
> > is being done.
>
> Huh? Last I checked, the fault_in_readable actually read a byte from
> the page. It has to wait for the read to complete before that can
> happen.

Ah, good point.

David