From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752112AbeERAXc (ORCPT ); Thu, 17 May 2018 20:23:32 -0400 Received: from a2nlsmtp01-03.prod.iad2.secureserver.net ([198.71.225.37]:54948 "EHLO a2nlsmtp01-03.prod.iad2.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751543AbeERAX3 (ORCPT ); Thu, 17 May 2018 20:23:29 -0400 x-originating-ip: 107.180.71.197 From: Long Li To: Steve French , linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org Cc: Long Li Subject: [RFC PATCH 00/09] Implement direct user I/O interfaces for RDMA Date: Thu, 17 May 2018 17:22:05 -0700 Message-Id: <20180518002214.5657-1-longli@linuxonhyperv.com> X-Mailer: git-send-email 2.17.0 Reply-To: longli@microsoft.com X-CMAE-Envelope: MS4wfMhDLIYs8xHYq1k5o6aNxPJ67R1WRQW8Aqzrfn5hrfS2W328cbAEIQ6m+s4HT8jLyZInRoSt6s9Rurs4DgW7X53wBjUVUryZYgNzE2bxniBHJvEh1Bpo xHaHQGFJJJ/rahwaBbSu5SEbGBOO3qzdaEq9mAJQpmrLMft0nyjf7PxUtjiHoCtLunYNfWEe1YvCmPpKygRlhf03fX9IuJiU0pzAMCSUL7aGWU9AYrJaQkJX 6i0AA+FceAgxUqZkwrg+C9LHKwy33uh49ZWIEBjyBXzi2iXjWWqw6EW010lftU5IWrtvMhovCXCzdTgDPztkE94tD1KOge4Q0nYPnVwClu+VF2T+R0CoaY9D SbtLG8XsR3cE995JEoP1eCJtXlf/IOrs31T0USTQO0XOakjlWNlSdPKf4GlCN/t3/y/d/PX8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Long Li This patchset implements direct user I/O through RDMA. In normal code path (even with cache=none), CIFS copies I/O data from user-space to kernel-space for security reasons. With this patchset, a new mounting option is introduced to have CIFS pin the user-space buffer into memory and performs I/O through RDMA. This avoids memory copy, at the cost of added security risk. This patchset is RFC. The work is in progress, do not merge. Long Li (9): Introduce offset for the 1st page in data transfer structures Change wdata alloc to support direct pages Change rdata alloc to support direct pages Change function to support offset when reading pages Change RDMA send to regonize page offset in the 1st page Change RDMA recv to support offset in the 1st page Support page offset in memory regsitrations Implement no-copy file I/O interfaces Introduce cache=rdma moutning option fs/cifs/cifs_fs_sb.h | 2 + fs/cifs/cifsfs.c | 19 +++ fs/cifs/cifsfs.h | 3 + fs/cifs/cifsglob.h | 6 + fs/cifs/cifsproto.h | 4 +- fs/cifs/cifssmb.c | 10 +- fs/cifs/connect.c | 13 +- fs/cifs/dir.c | 5 + fs/cifs/file.c | 351 ++++++++++++++++++++++++++++++++++++++++++---- fs/cifs/inode.c | 4 +- fs/cifs/smb2ops.c | 2 +- fs/cifs/smb2pdu.c | 22 ++- fs/cifs/smbdirect.c | 132 ++++++++++------- fs/cifs/smbdirect.h | 2 +- fs/read_write.c | 7 + include/linux/ratelimit.h | 2 +- 16 files changed, 489 insertions(+), 95 deletions(-) -- 2.7.4