[dm-devel] Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.

[Phillip Susi]

David Chinner wrote:
> That sounds like a good idea - we can leave the existing
> WRITE_BARRIER behaviour unchanged and introduce a new WRITE_ORDERED
> behaviour that only guarantees ordering. The filesystem can then
> choose which to use where appropriate....

So what if you want a synchronous write, but DON'T care about the order? 
   They need to be two completely different flags which you can choose 
to combine, or use individually.