linux-kernel - Re: [PATCH 1/7] iov_iter: Add a function to extract an iter's buffers to a bvec iter

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Message-ID: <1584071.1665756368@warthog.procyon.org.uk>
Date:   Fri, 14 Oct 2022 15:06:08 +0100
From:   David Howells <dhowells@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     dhowells@...hat.com, Steve French <smfrench@...il.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Shyam Prasad N <nspmangalore@...il.com>,
        Rohith Surabattula <rohiths.msft@...il.com>,
        Jeff Layton <jlayton@...nel.org>, linux-cifs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] iov_iter: Add a function to extract an iter's buffers to a bvec iter

Christoph Hellwig <hch@...radead.org> wrote:

> On Tue, Aug 23, 2022 at 03:12:14PM +0100, David Howells wrote:
> > Copy cifs's setup_aio_ctx_iter() and to lib/iov_iter.c and generalise it as
> > extract_iter_to_iter().  This allocates and sets up an array of bio_vecs
> > for all the page fragments in an I/O iterator and sets a second supplied
> > iterator to bvec-type pointing to the array.
> 
> Did you read my NACK and comments from last time?

No, because they ended up in a different mailbox from everything else for some
reason.

> I really do not like this as a general purpose helper.  This is an odd
> quirk that we really generally should not needed unless you have very
> convoluted locking.  So please keep it inside of cifs.

I'm using it in under-development netfslib code also.

Let me ask the question more generally in a separate email.

David