tcmu: make ring buffer timer configurable
This adds a timer, qfull_time_out, that controls how long a device will wait for ring buffer space to open before failing the commands in the queue. It is useful to separate this timer from the cmd_time_out and default 30 sec one, because for HA setups cmd_time_out may be disbled and 30 seconds is too long to wait when some OSs like ESX will timeout commands after as little as 8 - 15 seconds. Signed-off-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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