Received-SPF: pass (google.com: domain of linux-nfs-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Message-ID: <a786d17996459d1ed5530d7f193013c04d183e8c.camel@kernel.org>
Subject: Re: [PATCH] netfs: Fix READ/WRITE confusion when calling
 iov_iter_xarray()
From:   Jeff Layton <jlayton@kernel.org>
To:     David Howells <dhowells@redhat.com>, linux-cachefs@redhat.com
Cc:     linux-afs@lists.infradead.org, ceph-devel@vger.kernel.org,
        linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org,
        v9fs-developer@lists.sourceforge.net,
        linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Date:   Fri, 13 Aug 2021 08:53:41 -0400
In-Reply-To: <162729351325.813557.9242842205308443901.stgit@warthog.procyon.org.uk>
References: <162729351325.813557.9242842205308443901.stgit@warthog.procyon.org.uk>
Content-Type: text/plain; charset="ISO-8859-15"
User-Agent: Evolution 3.40.3 (3.40.3-1.fc34) 
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Precedence: bulk

On Mon, 2021-07-26 at 10:58 +0100, David Howells wrote:
> Fix netfs_clear_unread() to pass READ to iov_iter_xarray() instead of WRITE
> (the flag is about the operation accessing the buffer, not what sort of
> access it is doing to the buffer).
> 
> Fixes: 3d3c95046742 ("netfs: Provide readahead and readpage netfs helpers")
> Signed-off-by: David Howells <dhowells@redhat.com>
> cc: Jeff Layton <jlayton@kernel.org>
> cc: linux-cachefs@redhat.com
> cc: linux-afs@lists.infradead.org
> cc: ceph-devel@vger.kernel.org
> cc: linux-cifs@vger.kernel.org
> cc: linux-nfs@vger.kernel.org
> cc: v9fs-developer@lists.sourceforge.net
> cc: linux-fsdevel@vger.kernel.org
> cc: linux-mm@kvack.org
> ---
> 
>  fs/netfs/read_helper.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/netfs/read_helper.c b/fs/netfs/read_helper.c
> index 0b6cd3b8734c..994ec22d4040 100644
> --- a/fs/netfs/read_helper.c
> +++ b/fs/netfs/read_helper.c
> @@ -150,7 +150,7 @@ static void netfs_clear_unread(struct netfs_read_subrequest *subreq)
>  {
>  	struct iov_iter iter;
>  
> -	iov_iter_xarray(&iter, WRITE, &subreq->rreq->mapping->i_pages,
> +	iov_iter_xarray(&iter, READ, &subreq->rreq->mapping->i_pages,
>  			subreq->start + subreq->transferred,
>  			subreq->len   - subreq->transferred);
>  	iov_iter_zero(iov_iter_count(&iter), &iter);
> 
> 

That's better!

Reviewed-by: Jeff Layton <jlayton@kernel.org>