linux-kernel - Re: [PATCH 10/19] fs/io_uring: set FOLL_PIN via pin_user

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Message-ID: <20191031233721.GJ14771@iweiny-DESK2.sc.intel.com>
Date:   Thu, 31 Oct 2019 16:37:22 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Alex Williamson <alex.williamson@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Dave Chinner <david@...morbit.com>,
        David Airlie <airlied@...ux.ie>,
        "David S . Miller" <davem@...emloft.net>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>, Jens Axboe <axboe@...nel.dk>,
        Jonathan Corbet <corbet@....net>,
        Jérôme Glisse <jglisse@...hat.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Hocko <mhocko@...e.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Paul Mackerras <paulus@...ba.org>,
        Shuah Khan <shuah@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>, bpf@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, kvm@...r.kernel.org,
        linux-block@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-media@...r.kernel.org, linux-rdma@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
        linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 10/19] fs/io_uring: set FOLL_PIN via pin_user_pages()

On Wed, Oct 30, 2019 at 03:49:21PM -0700, John Hubbard wrote:
> Convert fs/io_uring to use the new pin_user_pages() call, which sets
> FOLL_PIN. Setting FOLL_PIN is now required for code that requires
> tracking of pinned pages, and therefore for any code that calls
> put_user_page().
> 

Reviewed-by: Ira Weiny <ira.weiny@...el.com>

> Signed-off-by: John Hubbard <jhubbard@...dia.com>
> ---
>  fs/io_uring.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/io_uring.c b/fs/io_uring.c
> index a30c4f622cb3..d3924b1760eb 100644
> --- a/fs/io_uring.c
> +++ b/fs/io_uring.c
> @@ -3431,9 +3431,8 @@ static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg,
>  
>  		ret = 0;
>  		down_read(&current->mm->mmap_sem);
> -		pret = get_user_pages(ubuf, nr_pages,
> -				      FOLL_WRITE | FOLL_LONGTERM,
> -				      pages, vmas);
> +		pret = pin_longterm_pages(ubuf, nr_pages, FOLL_WRITE, pages,
> +					  vmas);
>  		if (pret == nr_pages) {
>  			/* don't support file backed memory */
>  			for (j = 0; j < nr_pages; j++) {
> -- 
> 2.23.0
> 
>