[v2,00/15] CIFS: Add direct I/O support
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Message ID 20180530194807.31657-1-longli@linuxonhyperv.com
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  • CIFS: Add direct I/O support
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Long Li May 30, 2018, 7:47 p.m. UTC
From: Long Li <longli@microsoft.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@lst.de> and
Tom Talpey <ttalpey@microsoft.com> 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(-)