Re: [PATCH] loop 2/9 absorb bio_copy

From: Hugh Dickins (
Date: Tue Jun 10 2003 - 11:02:05 EST

On Tue, 10 Jun 2003, Jens Axboe wrote:
> On Tue, Jun 10 2003, Hugh Dickins wrote:
> > bio_copy is used only by the loop driver, which already has to walk the
> > bio segments itself: so it makes sense to change it from bio.c export
> > to loop.c static, as prelude to working upon it there.
> I don't think this is is a particularly good idea, it's pretty core bio
> functionality that should be left alone in bio.c imho.
> Is there a real reason you want to do this apart from 'loop is the only
> (current) user'?

As I said, loop already has to walk the bio segments itself elsewhere,
and a lot of what bio_copy does (e.g. copying data) it doesn't need done,
and other things it does (same gfp_mask for two very different allocations)
don't suit loop very well. By all means add bio_copy back into fs/bio.c
when something else needs that functionality?


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