On Tuesday 22 January 2008, Al Boldi wrote:
quoted text
> Chris Mason wrote:
> > Running fsync in data=ordered means that all of the dirty blocks on the
> > FS will get written before fsync returns.
>
> Hm, that's strange, I expected this kind of behaviour from data=journal.
>
> data=writeback should return immediatly, which seems it does, but
> data=ordered should only wait for metadata flush, it shouldn't wait for
> filedata flush.  Are you sure it waits for both?

I over simplified.  data=ordered means that all data blocks are written before 
the metadata that references them commits.

So, if you add 1GB to a fileA in a transaction and then run fsync(fileB) in 
the same transaction, the 1GB from fileA is sent to disk (and waited on) 
before the fsync on fileB returns.

-chris
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