Re: [PATCH] barrier patch set

From: Chris Mason
Date: Wed Mar 31 2004 - 09:25:00 EST

On Wed, 2004-03-31 at 09:08, Stephen C. Tweedie wrote:
> Hi,
> On Tue, 2004-03-30 at 23:21, Jeff Garzik wrote:
> > For IDE, O_DIRECT and O_SYNC can use special "FUA" commands, which don't
> > return until the data is on the platter.
> fsync() is still really nasty, because that can require that we wait on
> IO that was submitted by the VM before we knew that there was a
> synchronous IO wait coming.

Yes, it gets ugly in a hurry. Jeff, look at the whole thread about the
O_DIRECT read vs buffered write races. I don't think we can use FUA for
fsync or O_SYNC without using it for every write.

We might be able to get away with using it on O_DIRECT.


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