From: Dan Aloni <dan@kernelim.com>
To: Chuck Lever <chuck.lever@oracle.com>
Cc: linux-rdma <linux-rdma@vger.kernel.org>,
Linux NFS Mailing List <linux-nfs@vger.kernel.org>
Subject: Re: [PATCH] svcrdma: fix bounce buffers for non-zero page offsets
Date: Fri, 2 Oct 2020 18:18:33 +0300 [thread overview]
Message-ID: <20201002151833.GA988340@gmail.com> (raw)
In-Reply-To: <7DE1BF37-DF5E-47F2-A24C-A80ED20956CE@oracle.com>
On Fri, Oct 02, 2020 at 10:54:28AM -0400, Chuck Lever wrote:
> Hi Dan-
>
> > On Oct 2, 2020, at 10:48 AM, Dan Aloni <dan@kernelim.com> wrote:
> >
> > This was discovered using O_DIRECT and small unaligned file offsets
> > at the client side.
> >
> > Fixes: e248aa7be86 ("svcrdma: Remove max_sge check at connect time")
> > Signed-off-by: Dan Aloni <dan@kernelim.com>
> > ---
> > net/sunrpc/xprtrdma/svc_rdma_sendto.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
> > index 7b94d971feb3..c991eb1fd4e3 100644
> > --- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
> > +++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
> > @@ -638,7 +638,7 @@ static int svc_rdma_pull_up_reply_msg(struct svcxprt_rdma *rdma,
> > while (remaining) {
> > len = min_t(u32, PAGE_SIZE - pageoff, remaining);
> >
> > - memcpy(dst, page_address(*ppages), len);
> > + memcpy(dst, page_address(*ppages) + pageoff, len);
>
> I'm assuming the only relevant place that sets xdr->page_base
> is nfsd_splice_actor() ?
Yes, and traces at the server indeed indicate that splicing happened.
This works for both tmpfs and ext4 as host FSes.
--
Dan Aloni
next prev parent reply other threads:[~2020-10-02 15:18 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-02 14:48 [PATCH] svcrdma: fix bounce buffers for non-zero page offsets Dan Aloni
2020-10-02 14:54 ` Chuck Lever
2020-10-02 15:18 ` Dan Aloni [this message]
2020-10-02 15:23 ` Chuck Lever
2020-10-02 19:33 ` [PATCH v2] svcrdma: fix bounce buffers for unaligned offsets and multiple pages Dan Aloni
2020-10-14 21:26 ` J. Bruce Fields
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