Messages in this thread | | | From | Long Li <> | Subject | [Patch v3 00/16] CIFS: add support for direct I/O | Date | Sat, 8 Sep 2018 02:13:32 +0000 |
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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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