Re: Syncing the page cache, take 2

["Stephen C. Tweedie" <sct@redhat.com>]

Hi,

On Wed, Aug 16, 2000 at 12:14:33AM +0200, Daniel Phillips wrote:
> > 
> > (and even more ... we just about *need* the flush callback when
> > we're running in a multi-queue VM)
> 
> OK, but what about the case where the filesystem knows it wants the page
> cache to flush *right now*?  For example, when a filesystem wants to be
> sure the page cache is synced through to buffers just before marking a
> consistent state in the journal, say.  How does it make that happen?

Correct --- remember, Rik, that we talked about this?  It's not just
enough for the VM to call the address-space to flush dirty pages: you
also need to delegate the ability to manipulate the dirty status to
the fs.  In other words, you need a mark_page_dirty/clean() for pages
just as you already have for buffers.  

Do that and the filesystems can do pretty much what they want in
response to the callback.

Cheers,
 Stephen
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