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List:       linux-kernel
Subject:    Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md.
From:       David Chinner <dgc () sgi ! com>
Date:       2007-05-31 23:34:49
Message-ID: 20070531233449.GT86004887 () sgi ! com
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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
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