Re: [RFC PATCH 0/4] iov_iter: Add composite, scatterlist and skbuff iterator types

[Matthew Wilcox]

On Sat, Mar 22, 2025 at 11:21:28PM -0700, Christoph Hellwig wrote:
> This is going entirely in the wrong direction.  We don't need more iter
> types but less.  The reason why we have to many is because the underlying
> representation of the ranges is a mess which goes deeper than just the
> iterator, because it also means we have to convert between the
> underlying representations all the time.
> 
> E.g. the socket code should have (and either has for a while or at least
> there were patches) been using bio_vecs instead of reinventing them as sk
> fragment.  The crypto code should not be using scatterlists, which are a

I did this work six years ago -- see 8842d285bafa

Unfortunately, networking is full of inconsiderate arseholes who backed
it out without even talking to me in 21d2e6737c97