Re: [RFC] fsblock

[Christoph Hellwig <hch@infradead.org>]

On Mon, Jun 25, 2007 at 08:25:21AM -0400, Chris Mason wrote:
> > write_begin/write_end is a step in that direction (and it helps
> > OCFS and GFS quite a bit). I think there is also not much reason
> > for writepage sites to require the page to lock the page and clear
> > the dirty bit themselves (which has seems ugly to me).
> 
> If we keep the page mapping information with the page all the time (ie
> writepage doesn't have to call get_block ever), it may be possible to
> avoid sending down a locked page.  But, I don't know the delayed
> allocation internals well enough to say for sure if that is true.

The point of delayed allocations is that the mapping information doesn't
even exist until writepage for new allocations :)