# Re: \[PATCH v7 0/5\] vfs: Non-blockling buffered fs read (page cache only)

- From: Christoph Hellwig \<hch@infradead.org\>
- Date: 2015-03-27 08:48:33 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2015/03/94096
- Thread: https://ratatoskr.run/linux-fsdevel/2015/03/94095/t.md

```text
On Fri, Mar 27, 2015 at 01:35:16AM -0700, Andrew Morton wrote:
> fincore() doesn't have to be ugly.  Please address the design issues I
> raised.  How is pread2() useful to the class of applications which
> cannot proceed until all data is available?

It actually makes them work correctly?  preadv2( ..., DONTWAIT) will
return -EGAIN, which causes them to bounce to the threadpool where
they call preadv(...).
```