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Date: Tue, 19 Dec 2000 12:05:15 -0200 (BRST)
From: Marcelo Tosatti <marcelo@conectiva.com.br>
To: "Stephen C. Tweedie" <sct@redhat.com>
cc: Alexander Viro <viro@math.psu.edu>,
        Linus Torvalds <torvalds@transmeta.com>,
        Russell Cattelan <cattelan@thebarn.com>, linux-kernel@vger.kernel.org
Subject: Re: Test12 ll_rw_block error.
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On Mon, 18 Dec 2000, Stephen C. Tweedie wrote:

> Hi,
> 
> On Sun, Dec 17, 2000 at 12:38:17AM -0200, Marcelo Tosatti wrote:
> > On Fri, 15 Dec 2000, Stephen C. Tweedie wrote:
> > 
> > Stephen,
> > 
> > The ->flush() operation (which we've been discussing a bit) would be very
> > useful now (mainly for XFS).
> > 
> > At page_launder(), we can call ->flush() if the given page has it defined.
> > Otherwise use try_to_free_buffers() as we do now for filesystems which
> > dont care about the special flushing treatment. 
> 
> As of 2.4.0test12, page_launder() will already call the
> per-address-space writepage() operation for dirty pages.  Do you need
> something similar for clean pages too, or does Linus's new laundry
> code give you what you need now?

I think the semantics of the filesystem specific ->flush and ->writepage
are not the same.

Is ok for filesystem specific writepage() code to sync other "physically
contiguous" dirty pages with reference to the one requested by
writepage() ? 

If so, it can do the same job as the ->flush() idea we've discussing.



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