linux-kernel - [Patch v3 00/16] CIFS: add support for direct I/O

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Date:   Sat,  8 Sep 2018 02:13:32 +0000
From:   Long Li <longli@...uxonhyperv.com>
To:     Steve French <sfrench@...ba.org>, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org
Cc:     Long Li <longli@...rosoft.com>
Subject: [Patch v3 00/16] CIFS: add support for direct I/O

From: Long Li <longli@...rosoft.com>

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 <hch@....de> and
Tom Talpey <ttalpey@...rosoft.com> to implement direct I/O for both
socket and RDMA.

Patch v3 added support for kernel AIO.


Long Li (16):
  CIFS: Add support for direct pages in rdata
  CIFS: Use offset when reading pages
  CIFS: Add support for direct pages in wdata
  CIFS: pass page offset when issuing SMB write
  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: Do not call ib_dereg_mr on invalidated memory registration
  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      |  10 +-
 fs/cifs/cifsfs.h      |   2 +
 fs/cifs/cifsglob.h    |  11 +-
 fs/cifs/cifsproto.h   |   9 +-
 fs/cifs/cifssmb.c     |  19 +-
 fs/cifs/connect.c     |   5 +-
 fs/cifs/file.c        | 477 ++++++++++++++++++++++++++++++++++++++++++--------
 fs/cifs/misc.c        |  17 ++
 fs/cifs/smb2ops.c     |  22 ++-
 fs/cifs/smb2pdu.c     |  20 ++-
 fs/cifs/smbdirect.c   | 156 ++++++++++-------
 fs/cifs/smbdirect.h   |   2 +-
 fs/cifs/transport.c   |  34 ++--
 14 files changed, 606 insertions(+), 187 deletions(-)

-- 
2.7.4