netdev - Re: [PATCH 12/23] ceph: use bvec_set

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Message-ID: <CAOi1vP_b77Pq=hYmFMi1zGGRMee2uNjbAbHz_gCCoByOdbRqLw@mail.gmail.com>
Date:   Mon, 30 Jan 2023 19:02:08 +0100
From:   Ilya Dryomov <idryomov@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Jens Axboe <axboe@...nel.dk>,
        "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>,
        David Howells <dhowells@...hat.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>,
        Paolo Abeni <pabeni@...hat.com>,
        Chuck Lever <chuck.lever@...cle.com>,
        linux-block@...r.kernel.org, ceph-devel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-nvme@...ts.infradead.org, linux-scsi@...r.kernel.org,
        target-devel@...r.kernel.org, kvm@...r.kernel.org,
        netdev@...r.kernel.org, linux-afs@...ts.infradead.org,
        linux-cifs@...r.kernel.org, samba-technical@...ts.samba.org,
        linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
        devel@...ts.orangefs.org, io-uring@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH 12/23] ceph: use bvec_set_page to initialize a bvec

On Mon, Jan 30, 2023 at 10:22 AM Christoph Hellwig <hch@....de> wrote:
>
> Use the bvec_set_page helper to initialize a bvec.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  fs/ceph/file.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/fs/ceph/file.c b/fs/ceph/file.c
> index 764598e1efd91f..6419dce7c57987 100644
> --- a/fs/ceph/file.c
> +++ b/fs/ceph/file.c
> @@ -103,11 +103,11 @@ static ssize_t __iter_get_bvecs(struct iov_iter *iter, size_t maxsize,
>                 size += bytes;
>
>                 for ( ; bytes; idx++, bvec_idx++) {
> -                       struct bio_vec bv = {
> -                               .bv_page = pages[idx],
> -                               .bv_len = min_t(int, bytes, PAGE_SIZE - start),
> -                               .bv_offset = start,
> -                       };
> +                       struct bio_vec bv;
> +
> +                       bvec_set_page(&bv, pages[idx],

Hi Christoph,

There is trailing whitespace on this line which git complains about
and it made me take a second look.  I think bvec_set_page() allows to
make this more compact:

        for ( ; bytes; idx++, bvec_idx++) {
                int len = min_t(int, bytes, PAGE_SIZE - start);

                bvec_set_page(&bvecs[bvec_idx], pages[idx], len, start);
                bytes -= len;
                start = 0;
        }

Thanks,

                Ilya