linux-kernel - Re: [PATCH 1/2] block: add bio_iov_iter_get

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Date:   Tue, 1 Nov 2016 15:19:08 +0100
From:   Christoph Hellwig <hch@....de>
To:     Ming Lei <tom.leiming@...il.com>
Cc:     Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...com>,
        linux-block <linux-block@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kent Overstreet <kent.overstreet@...il.com>
Subject: Re: [PATCH 1/2] block: add bio_iov_iter_get_pages()

On Tue, Nov 01, 2016 at 09:05:00AM +0800, Ming Lei wrote:
> > +       size = iov_iter_get_pages(iter, pages, LONG_MAX, nr_pages, &offset);
> 
> BTW, if there is one multi-page version of get_user_pages_fast() and
> iov_iter_get_pages(), size of page array can be reduced too.

There isn't at the moment.  I have some plans for it, but it will require
lots of mm and arch changes, so I'd like to keep it separate.