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    rxrpc: Need to produce an ACK for service op if op takes a long time · 9749fd2b
    David Howells 提交于
    We need to generate a DELAY ACK from the service end of an operation if we
    start doing the actual operation work and it takes longer than expected.
    This will hard-ACK the request data and allow the client to release its
    resources.
    
    To make this work:
    
     (1) We have to set the ack timer and propose an ACK when the call moves to
         the RXRPC_CALL_SERVER_ACK_REQUEST and clear the pending ACK and cancel
         the timer when we start transmitting the reply (the first DATA packet
         of the reply implicitly ACKs the request phase).
    
     (2) It must be possible to set the timer when the caller is holding
         call->state_lock, so split the lock-getting part of the timer function
         out.
    
     (3) Add trace notes for the ACK we're requesting and the timer we clear.
    Signed-off-by: NDavid Howells <dhowells@redhat.com>
    9749fd2b
call_event.c 11.0 KB