[PATCH][SMB3 client] retry on failed server close

[Steve French]

Have rebased and lightly updated Ritvik's patch for retrying when
server returns error on close.  See attached.

In the current implementation, CIFS close sends a close to the
server and does not check for the success of the server close.
This patch adds functionality to check for server close return
status and retries in case of an EBUSY or EAGAIN error.

This can help avoid handle leaks.



-- 
Thanks,

Steve
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