Re: [RFC] relaxed barrier semantics

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On Thu, Jul 29, 2010 at 03:44:31PM -0400, Ric Wheeler wrote:
> I confess that I am a bit fuzzy on FUA, but think that it means that any 
> FUA tagged IO will go down to persistent store before returning.

Exactly.

> If so, then all order dependent IO would need to be issued in order and 
> tagged with FUA. It would not suffice to tag just the commit record as 
> FUA, or do I misunderstand what FUA does?

The commit record is ext3/4 specific terminalogy.  In xfs we just have
one type of log buffers, and we could tag that as FUA.  There is very
little other depenent I/O, but if that is present we need a pre-flush
for it anyway. 

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