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Date: Sat, 16 Dec 2000 18:54:10 -0600
From: Russell Cattelan <cattelan@thebarn.com>
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To: Chris Mason <mason@suse.com>
CC: Alexander Viro <viro@math.psu.edu>,
        Linus Torvalds <torvalds@transmeta.com>,
        "Stephen C. Tweedie" <sct@redhat.com>, linux-kernel@vger.kernel.org
Subject: Re: Test12 ll_rw_block error.
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Chris Mason wrote:

> On Fri, 15 Dec 2000, Alexander Viro wrote:
>
> > Just one: any fs that really cares about completion callback is very likely
> > to be picky about the requests ordering. So sync_buffers() is very unlikely
> > to be useful anyway.
> >
> Somewhat.  I guess there are at least two ways to do it.  First flush the
> buffers where ordering matters (log blocks), then send the others onto the
> dirty list (general metadata).  You might have your own end_io for those, and
> sync_buffers would lose it.
>
> Second way (reiserfs recently changed to this method) is to do all the
> flushing yourself, and remove the need for an end_io call back.
>
I'm curious about this.
Does the mean reiserFS is doing all of it's own buffer management?

This would seem a little redundant with what is already in the kernel?

>
>
> > In that sense we really don't have anonymous buffers here. I seriously
> > suspect that "unrealistic" assumption is not unrealistic at all. I'm
> > not sufficiently familiar with XFS code to say for sure, but...
> >
> > What we really need is a way for VFS/VM to pass the pressure on filesystem.
> > That's it. If fs wants unusual completions for requests - let it have its
> > own queueing mechanism and submit these requests when it finds that convenient.
> >
> Yes, this is exactly what we've discussed.
>
> -chris

--
Russell Cattelan
cattelan@thebarn.com



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