From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Venkateswararao Jujjuri (JV)" Subject: [PATCH 6/7] [net/9p] Write side zerocopy changes for 9P2000.L protocol. Date: Sun, 13 Feb 2011 18:21:32 -0800 Message-ID: <1297650093-10508-7-git-send-email-jvrao@linux.vnet.ibm.com> References: <1297650093-10508-1-git-send-email-jvrao@linux.vnet.ibm.com> Cc: linux-fsdevel@vger.kernel.org, "Venkateswararao Jujjuri (JV)" To: v9fs-developer@lists.sourceforge.net Return-path: Received: from e38.co.us.ibm.com ([32.97.110.159]:52903 "EHLO e38.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751334Ab1BNBnQ (ORCPT ); Sun, 13 Feb 2011 20:43:16 -0500 Received: from d03relay05.boulder.ibm.com (d03relay05.boulder.ibm.com [9.17.195.107]) by e38.co.us.ibm.com (8.14.4/8.13.1) with ESMTP id p1E1SpDQ012644 for ; Sun, 13 Feb 2011 18:28:51 -0700 Received: from d03av02.boulder.ibm.com (d03av02.boulder.ibm.com [9.17.195.168]) by d03relay05.boulder.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p1E1hDFo095788 for ; Sun, 13 Feb 2011 18:43:13 -0700 Received: from d03av02.boulder.ibm.com (loopback [127.0.0.1]) by d03av02.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p1E1hCEj017092 for ; Sun, 13 Feb 2011 18:43:12 -0700 In-Reply-To: <1297650093-10508-1-git-send-email-jvrao@linux.vnet.ibm.com> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Modify p9_client_write() to check the transport preference and act accordingly. If the preference is P9_TRANS_PREF_PAYLOAD_SEP, send the payload separately instead of putting it directly on PDU. Signed-off-by: Venkateswararao Jujjuri --- net/9p/client.c | 21 +++++++++++++++------ 1 files changed, 15 insertions(+), 6 deletions(-) diff --git a/net/9p/client.c b/net/9p/client.c index 82079f9..412c52e 100644 --- a/net/9p/client.c +++ b/net/9p/client.c @@ -1333,12 +1333,21 @@ p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, if (count < rsize) rsize = count; - if (data) - req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset, - rsize, data); - else - req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset, - rsize, udata); + + /* Don't bother zerocopy form small IO (< 1024) */ + if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) == + P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) { + req = p9_client_rpc(clnt, P9_TWRITE, "dqE", fid->fid, offset, + rsize, data, udata); + } else { + + if (data) + req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, + offset, rsize, data); + else + req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, + offset, rsize, udata); + } if (IS_ERR(req)) { err = PTR_ERR(req); goto error; -- 1.6.5.2