Re: [RFC] fsblock

[David Chinner <dgc@sgi.com>]

On Thu, Jun 28, 2007 at 08:20:31AM -0400, Chris Mason wrote:
> On Thu, Jun 28, 2007 at 04:44:43AM +0200, Nick Piggin wrote:
> > That's true but I don't think an extent data structure means we can
> > become too far divorced from the pagecache or the native block size
> > -- what will end up happening is that often we'll need "stuff" to map
> > between all those as well, even if it is only at IO-time.
> 
> I think the fundamental difference is that fsblock still does:
> mapping_info = page->something, where something is attached on a per
> page basis.  What we really want is mapping_info = lookup_mapping(page),

lookup_block_mapping(page).... ;)

But yes, that is the essence of what I was saying. Thanks for
describing it so concisely, Chris.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group