netdev - Re: [PATCH 01/23] block: factor out a bvec_set

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Message-ID: <20230130103619.GA11874@lst.de>
Date:   Mon, 30 Jan 2023 11:36:19 +0100
From:   Christoph Hellwig <hch@....de>
To:     David Howells <dhowells@...hat.com>
Cc:     Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Ilya Dryomov <idryomov@...il.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Minchan Kim <minchan@...nel.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Keith Busch <kbusch@...nel.org>,
        Sagi Grimberg <sagi@...mberg.me>,
        Chaitanya Kulkarni <kch@...dia.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Marc Dionne <marc.dionne@...istor.com>,
        Xiubo Li <xiubli@...hat.com>, Steve French <sfrench@...ba.org>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna@...nel.org>,
        Mike Marshall <hubcap@...ibond.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
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Subject: Re: [PATCH 01/23] block: factor out a bvec_set_page helper

On Mon, Jan 30, 2023 at 10:33:36AM +0000, David Howells wrote:
> Christoph Hellwig <hch@....de> wrote:
> 
> > +static inline void bvec_set_page(struct bio_vec *bv, struct page *page,
> > +		unsigned int len, unsigned int offset)
> 
> Could you swap len and offset around?  It reads better offset first.  You move
> offset into the page and then do something with len bytes.

This matches bio_add_page and the order inside bio_vec itself.  willy
wanted to switch it around for bio_add_folio but Jens didn't like it,
so I'll stick to the current convention in this area as well.