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    Subject[Patch v3 00/16] CIFS: add support for direct I/O
    Date
    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.

    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

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