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b6e2d62fb3
sink_write() currently relies on sink->maxlen to know when to stop writing a given payload. But it could be useful to pass a smaller, explicit value to sink_write() to stop before the ring maxlen, for instance if the ring is shared between multiple feeders. sink_write() now takes an optional maxlen parameter: if maxlen is > 0, then sink_write will stop writing at maxlen if maxlen is smaller than ring->maxlen, else only ring->maxlen will be considered. [for haproxy <= 2.7, patch must be applied by hand: that is: __sink_write() and sink_write() should be patched to take maxlen into account and function calls to sink_write() should use 0 as second argument to keep original behavior]