CIFS: Add support for direct I/O write
With direct I/O write, user supplied buffers are pinned to the memory and data are transferred directly from user buffers to the transport layer. Change in v3: add support for kernel AIO Change in v4: Refactor common write code to __cifs_writev for direct and non-direct I/O. Retry on direct I/O failure. Signed-off-by: NLong Li <longli@microsoft.com> Signed-off-by: NSteve French <stfrench@microsoft.com>
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