linux-kernel - Re: [PATCH v2 31/34] fs/nfs: convert put_page() to put_user

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Message-ID: <cf978e10-facc-ba5b-d7e4-d7fc2c3f7ebc@oracle.com>
Date:   Mon, 5 Aug 2019 01:26:59 +0100
From:   Calum Mackay <calum.mackay@...cle.com>
To:     john.hubbard@...il.com, Andrew Morton <akpm@...ux-foundation.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jérôme Glisse <jglisse@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        amd-gfx@...ts.freedesktop.org, ceph-devel@...r.kernel.org,
        devel@...verdev.osuosl.org, devel@...ts.orangefs.org,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-fbdev@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-mm@...ck.org,
        linux-nfs@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org, linux-xfs@...r.kernel.org,
        netdev@...r.kernel.org, rds-devel@....oracle.com,
        sparclinux@...r.kernel.org, x86@...nel.org,
        xen-devel@...ts.xenproject.org, John Hubbard <jhubbard@...dia.com>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>
Subject: Re: [PATCH v2 31/34] fs/nfs: convert put_page() to put_user_page*()

On 04/08/2019 11:49 pm, john.hubbard@...il.com wrote:
> From: John Hubbard <jhubbard@...dia.com>
> 
> For pages that were retained via get_user_pages*(), release those pages
> via the new put_user_page*() routines, instead of via put_page() or
> release_pages().
> 
> This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
> ("mm: introduce put_user_page*(), placeholder versions").
> 
> Cc: Calum Mackay <calum.mackay@...cle.com>
> Cc: Trond Myklebust <trond.myklebust@...merspace.com>
> Cc: Anna Schumaker <anna.schumaker@...app.com>
> Cc: linux-nfs@...r.kernel.org
> Signed-off-by: John Hubbard <jhubbard@...dia.com>
> ---
>   fs/nfs/direct.c | 11 ++---------
>   1 file changed, 2 insertions(+), 9 deletions(-)

Reviewed-by: Calum Mackay <calum.mackay@...cle.com>


> diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
> index 0cb442406168..c0c1b9f2c069 100644
> --- a/fs/nfs/direct.c
> +++ b/fs/nfs/direct.c
> @@ -276,13 +276,6 @@ ssize_t nfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
>   	return nfs_file_direct_write(iocb, iter);
>   }
>   
> -static void nfs_direct_release_pages(struct page **pages, unsigned int npages)
> -{
> -	unsigned int i;
> -	for (i = 0; i < npages; i++)
> -		put_page(pages[i]);
> -}
> -
>   void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
>   			      struct nfs_direct_req *dreq)
>   {
> @@ -512,7 +505,7 @@ static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq,
>   			pos += req_len;
>   			dreq->bytes_left -= req_len;
>   		}
> -		nfs_direct_release_pages(pagevec, npages);
> +		put_user_pages(pagevec, npages);
>   		kvfree(pagevec);
>   		if (result < 0)
>   			break;
> @@ -935,7 +928,7 @@ static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq,
>   			pos += req_len;
>   			dreq->bytes_left -= req_len;
>   		}
> -		nfs_direct_release_pages(pagevec, npages);
> +		put_user_pages(pagevec, npages);
>   		kvfree(pagevec);
>   		if (result < 0)
>   			break;
>