From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932547AbeE3Tw1 (ORCPT ); Wed, 30 May 2018 15:52:27 -0400 Received: from a2nlsmtp01-04.prod.iad2.secureserver.net ([198.71.225.38]:60154 "EHLO a2nlsmtp01-04.prod.iad2.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932248AbeE3Ttv (ORCPT ); Wed, 30 May 2018 15:49:51 -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: [Patch v2 00/15] CIFS: Add direct I/O support Date: Wed, 30 May 2018 12:47:52 -0700 Message-Id: <20180530194807.31657-1-longli@linuxonhyperv.com> X-Mailer: git-send-email 2.17.0 Reply-To: longli@microsoft.com X-CMAE-Envelope: MS4wfOXTRW/GUneQYLoecZdiasFtUNNpaLz/S4ZgqJTHTd47qxTI9hnEpOeZuC3eJfSjt+3HCyi7Xh8iGB7Q73GOCL/4yhlKfWu5dEKGWxcRadQzcMXOxlXd lPIyqCpuY3Fpk5GlN27fT/4RbBc0B//xwgIYBEpHh61YbXPQZH9qNQ0SFm9+zY23JX9QyDmh09Lvr526uu96D7CNyE7TXgRakqRr/NRMXz96JGtn/uOElhXq M2ZH3M+W6JmHn7pHE/2e7SgJfcvwrOKphbHscKRUo3LkP/RXske6Gvh00LaKe3acLBJjpWx8lp/Rwiremo1/KidT/AWevz1iZl6ZPygNImcHJad4Cs+PaBJ2 bcGEATleor/q1coFObJGUz+zC/Eu7P5xdGxb7g6wZRzx6okCjfRi5dJ2S08bNb1u6redKPed Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Long Li This patch set implements direct I/O. In normal code path (even with cache=none), CIFS copies I/O data from user-space to kernel-space for security reasons of possible protocol required signing and encryption on user data. With this patch set, CIFS passes the I/O data directly from user-space buffer to the transport layer, when file system is mounted with "cache-none". Patch v2 addressed comments from Christoph Hellwig and Tom Talpey to implement direct I/O for both socket and RDMA. Long Li (15): CIFS: Introduce offset for the 1st page in data transfer structures CIFS: Add support for direct pages in rdata CIFS: Use offset when reading pages CIFS: Add support for direct pages in wdata CIFS: Calculate the correct request length based on page offset and tail size CIFS: Introduce helper function to get page offset and length in smb_rqst CIFS: When sending data on socket, pass the correct page offset CIFS: SMBD: Support page offset in RDMA send CIFS: SMBD: Support page offset in RDMA recv CIFS: SMBD: Support page offset in memory registration CIFS: Pass page offset for calculating signature CIFS: Pass page offset for encrypting CIFS: Add support for direct I/O read CIFS: Add support for direct I/O write CIFS: Add direct I/O functions to file_operations fs/cifs/cifsencrypt.c | 9 +- fs/cifs/cifsfs.c | 5 +- fs/cifs/cifsfs.h | 2 + fs/cifs/cifsglob.h | 7 +- fs/cifs/cifsproto.h | 9 +- fs/cifs/cifssmb.c | 17 ++- fs/cifs/connect.c | 5 +- fs/cifs/file.c | 389 +++++++++++++++++++++++++++++++++++++++++++++++--- fs/cifs/misc.c | 17 +++ fs/cifs/smb2ops.c | 22 +-- fs/cifs/smb2pdu.c | 20 ++- fs/cifs/smbdirect.c | 121 ++++++++++------ fs/cifs/smbdirect.h | 2 +- fs/cifs/transport.c | 34 +++-- 14 files changed, 554 insertions(+), 105 deletions(-) -- 2.7.4