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Date:   Thu, 31 Oct 2019 16:37:22 -0700
From:   Ira Weiny <ira.weiny@intel.com>
To:     John Hubbard <jhubbard@nvidia.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Al Viro <viro@zeniv.linux.org.uk>,
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        Dave Chinner <david@fromorbit.com>,
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Subject: Re: [PATCH 10/19] fs/io_uring: set FOLL_PIN via pin_user_pages()
Message-ID: <20191031233721.GJ14771@iweiny-DESK2.sc.intel.com>
References: <20191030224930.3990755-1-jhubbard@nvidia.com>
 <20191030224930.3990755-11-jhubbard@nvidia.com>
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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@intel.com>

> Signed-off-by: John Hubbard <jhubbard@nvidia.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
> 
>