CIFS: Fix adjustment of credits for MTU requests
Currently for MTU requests we allocate maximum possible credits in advance and then adjust them according to the request size. While we were adjusting the number of credits belonging to the server, we were skipping adjustment of credits belonging to the request. This patch fixes it by setting request credits to CreditCharge field value of SMB2 packet header. Also ask 1 credit more for async read and write operations to increase parallelism and match the behavior of other operations. Signed-off-by: NPavel Shilovsky <pshilov@microsoft.com> Signed-off-by: NSteve French <stfrench@microsoft.com> CC: Stable <stable@vger.kernel.org>
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