Re: [PATCH 00/12] block/bio, fs: convert put_page() to put_user_page*()

[John Hubbard]

On 8/6/19 11:34 PM, Christoph Hellwig wrote:
> On Mon, Aug 05, 2019 at 03:54:35PM -0700, John Hubbard wrote:
> > On 7/23/19 11:17 PM, Christoph Hellwig wrote:
...
> > > I think we can do this in a simple and better way.  We have 5 ITER_*
> > > types.  Of those ITER_DISCARD as the name suggests never uses pages, so
> > > we can skip handling it.  ITER_PIPE is rejected Ñn the direct I/O path,
> > > which leaves us with three.
> >
> > Hi Christoph,
> >
> > Are you working on anything like this?
>
> I was hoping I could steer you towards it.  But if you don't want to do
> it yourself I'll add it to my ever growing todo list.

Sure, I'm up for this. The bvec-related items are the next logical part
of the gup/dma conversions to work on, and I just wanted to avoid solving the
same problem if you were already in the code.


> > Or on the put_user_bvec() idea?
>
> I have a prototype from two month ago:
>
> http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/gup-bvec
>
> but that only survived the most basic testing, so it'll need more work,
> which I'm not sure when I'll find time for.

I'll take a peek, and probably pester you with a few questions if I get
confused. :)

thanks,
--
John Hubbard
NVIDIA