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

[David Chinner <dgc sgi com>]

On Thu, May 31, 2007 at 02:31:21PM -0400, Phillip Susi wrote:
> 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? 

submit_bio(WRITE_SYNC, bio);

Already there, already used by XFS, JFS and direct I/O.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group