Re: [PATCH] various allocator optimizations

[Chris Mason <mason@suse.com>]

On Fri, 2003-03-14 at 13:59, Hans Reiser wrote:

> >Grin, who are you and what have you done with the real hans ;-) 
> >
> You don't need it for every file, you need it for every directory.
> 

How does a given file know which directory to update, you'd need a
pointer in each file to the corresponding key of the directory where the
accounting is actually done.

> > It's
> >two fields, one for the counter and one to point up the chain to the
> >real owner.  It's yet another field to maintain as objects are deleted
> >and created, 
> >
> or written to or truncated, yes, the cost of lots of updates to this are 
> worrying.    It might be better done in the repacker than dynamically, 
> in fact I just convinced myself of that, how about you.....?
> 
> >a minor format change since old filesystem stat data won't
> >have the field, and requires support from fsck.
> >
> Nobody will mind if we change reiser4 format now....
> 

I'm also concerned with improving the block allocator for reiserfs v3,
there's no reason to keep the existing one if minor changes can make it
substantially better.

-chris