Re: Device loses barrier support (was: Fixed patch for simplebarriers.)

From: Christoph Hellwig
Date: Thu Dec 04 2008 - 12:53:26 EST

On Thu, Dec 04, 2008 at 06:48:38PM +0100, Andi Kleen wrote:
> I think. Just the low level xfs_buf interface happens to use the asynchronous
> callbacks instead of calling into the block layer directly like jbd
> do.

Only delwri buffers are delayed in XFS, but the journaling code only
uses async buffers which *synchronously* call into the block layer, but
just don't wait for it to complete..

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