RFC: s3/smbd: change locking behavior when "lock spin time = 0"

[Steven Danneman]

Attached is a patch to change the smbd locking behavior when "lock spin
time = 0".  Essentially, this reverts the behavior back to the Samba 3.0
semantics where do_spin_lock() was used.

 

This is useful for naughty clients who spam the server with trylocks and
don't want to be slowed down.  Specifically, I'm using this for a client
application that will send 20 trylocks in a row when it's contending.
With the default setting this causes it to wait for several seconds.

 

Any comments before I check-in?

 

-Steven 

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