From: Long Li <longli@xxxxxxxxxxxxx>
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@xxxxxx> and
Tom Talpey <ttalpey@xxxxxxxxxxxxx> 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
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