[PATCH#3] fake data io module for samba

[Peter Somogyi]

Volker Lendecke <Volker.Lendecke at SerNet.DE> wrote on 12/29/2014 09:11:36 
AM:
...
> > > 
> > > Yep. One thing this module could test would be some
> > > arbitrary or random delay in the async pread/pwrite
> > > operations in order to test the for example our client-side
> > > crediting algorithm. If we hold back some requests
> > > server-side, the client should fill the pipe according to
> > > the available credits and continue when they become
> > > available.
> > > 
> > > Volker
> > 
> > Volker, did you mean adding the delay to the beginning of the whole 
> > vfswrap_pread_recv/send, or just the async parts 
> > [asys_pread_do/asys_pwrite_do] (which are not on the VFS) ?
> > I assume vfswrap_pread_recv/send VFS calls were designed to return 
> > immediately.
> 
> Yes, the _send calls are designed to return immediately
> without any delay or blocking. You could pretty easily add a
> tevent_wakeup_send to the pread_send call to wake you up
> after a read delay. This way many outstanding request would
> be handled in parallel with some random timeout.
> 

Okay, next week I'm back and then can continue.
Random timeout is interesting, then it needs some high and low threshold 
as extra params.

Summary:
- add aio support
- "fakeio:destroy data" = yes extra option
- "fakeio:rnd delay hi", "fakeio:rnd delay lo" in microsecs (if hi=lo then 
no random effect)

--
Peter Somogyi
IBM Magyarországi Kft.
1117 Budapest
Infopark, Neumann János u. 1.
Hungary
Phone: +36 1 382 5469