Re: [sqlite] light weight write barriers

[Vladislav Bolkhovitin]

Alan Cox, on 11/13/2012 12:40 PM wrote:
> > > Barriers are pretty much universal as you need them for power off !
> >
> > I'm afraid, no storage (drives, if you like this term more) at the moment supports
> > barriers and, as far as I know the storage history, has never supported.
>
> The ATA cache flush is a write barrier, and given you have no NV cache
> visible to the controller it's the same thing.

The cache flush is cache flush. You can call it barrier, if you want to continue 
confusing yourself and others.

> > Instead, what storage does support in this area are:
>
> Yes - the devil is in the detail once you go beyond simple capabilities.

None of those details brings anything not solvable. For instance, I already 
described in this thread a simple way how requested order of commands can be 
carried through the stack and implemented that algorithm in SCST.

Vlad
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