linux-kernel - Re: [PATCH 5/6] NFS: direct-io: convert to FOLL

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Message-ID: <YwqfWoAE2Awp4YvT@ZenIV>
Date:   Sat, 27 Aug 2022 23:48:58 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Jens Axboe <axboe@...nel.dk>,
        Miklos Szeredi <miklos@...redi.hu>,
        Christoph Hellwig <hch@...radead.org>,
        "Darrick J . Wong" <djwong@...nel.org>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna@...nel.org>, Jan Kara <jack@...e.cz>,
        Logan Gunthorpe <logang@...tatee.com>,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/6] NFS: direct-io: convert to FOLL_PIN pages

On Sat, Aug 27, 2022 at 01:36:06AM -0700, John Hubbard wrote:
> Convert the NFS Direct IO layer to use pin_user_pages_fast() and
> unpin_user_page(), instead of get_user_pages_fast() and put_page().

Again, this stuff can be hit with ITER_BVEC iterators

> -		result = iov_iter_get_pages_alloc2(iter, &pagevec,
> +		result = dio_w_iov_iter_pin_pages_alloc(iter, &pagevec,
>  						  rsize, &pgbase);

and this will break on those.