smb3: request more credits on tree connect
If we try large I/O (read or write) immediately after mount we won't typically have enough credits because we only request large amounts of credits on the first session setup. So if large I/O is attempted soon after mount we will typically only have about 43 credits rather than 105 credits (with this patch) available for the large i/o (which needs 64 credits minimum). This patch requests more credits during tree connect, which helps ensure that we have enough credits when mount completes (between these requests and the first session setup) in order to start large I/O immediately after mount if needed. Signed-off-by: Steve French <stfrench@microsoft.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
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