From: Kent Overstreet <kent.overstreet@gmail.com>
To: Ming Lei <ming.lei@redhat.com>
Cc: Jens Axboe <axboe@fb.com>, Christoph Hellwig <hch@infradead.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
David Sterba <dsterba@suse.cz>, Huang Ying <ying.huang@intel.com>,
linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
Theodore Ts'o <tytso@mit.edu>,
"Darrick J . Wong" <darrick.wong@oracle.com>,
Coly Li <colyli@suse.de>, Filipe Manana <fdmanana@gmail.com>
Subject: Re: [RESEND PATCH V5 12/33] block: introduce bio_segments()
Date: Fri, 25 May 2018 00:42:27 -0400 [thread overview]
Message-ID: <20180525044227.GA8740@kmo-pixel> (raw)
In-Reply-To: <20180525034621.31147-13-ming.lei@redhat.com>
On Fri, May 25, 2018 at 11:46:00AM +0800, Ming Lei wrote:
> There are still cases in which we need to use bio_segments() for get the
> number of segment, so introduce it.
>
> Signed-off-by: Ming Lei <ming.lei@redhat.com>
> ---
> include/linux/bio.h | 25 ++++++++++++++++++++-----
> 1 file changed, 20 insertions(+), 5 deletions(-)
>
> diff --git a/include/linux/bio.h b/include/linux/bio.h
> index 08af9272687f..b24c00f99c9c 100644
> --- a/include/linux/bio.h
> +++ b/include/linux/bio.h
> @@ -227,9 +227,9 @@ static inline bool bio_rewind_iter(struct bio *bio, struct bvec_iter *iter,
>
> #define bio_iter_last(bvec, iter) ((iter).bi_size == (bvec).bv_len)
>
> -static inline unsigned bio_pages(struct bio *bio)
> +static inline unsigned __bio_elements(struct bio *bio, bool seg)
This is a rather silly helper function, there isn't any actual code that's
shared, everything's behind an if () statement. Just open code it in bio_pages()
and bio_segments()
> {
> - unsigned segs = 0;
> + unsigned elems = 0;
> struct bio_vec bv;
> struct bvec_iter iter;
>
> @@ -249,10 +249,25 @@ static inline unsigned bio_pages(struct bio *bio)
> break;
> }
>
> - bio_for_each_page(bv, bio, iter)
> - segs++;
> + if (!seg) {
> + bio_for_each_page(bv, bio, iter)
> + elems++;
> + } else {
> + bio_for_each_segment(bv, bio, iter)
> + elems++;
> + }
> +
> + return elems;
> +}
> +
> +static inline unsigned bio_pages(struct bio *bio)
> +{
> + return __bio_elements(bio, false);
> +}
>
> - return segs;
> +static inline unsigned bio_segments(struct bio *bio)
> +{
> + return __bio_elements(bio, true);
> }
>
> /*
> --
> 2.9.5
>
next prev parent reply other threads:[~2018-05-25 4:42 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-25 3:45 [RESEND PATCH V5 00/33] block: support multipage bvec Ming Lei
2018-05-25 3:45 ` [RESEND PATCH V5 01/33] block: rename bio_for_each_segment* with bio_for_each_page* Ming Lei
2018-05-25 3:45 ` [RESEND PATCH V5 02/33] block: rename rq_for_each_segment as rq_for_each_page Ming Lei
2018-05-25 3:45 ` [RESEND PATCH V5 03/33] block: rename bio_segments() with bio_pages() Ming Lei
2018-05-25 3:45 ` [RESEND PATCH V5 04/33] block: introduce multipage page bvec helpers Ming Lei
2018-05-25 3:45 ` [RESEND PATCH V5 05/33] block: introduce bio_for_each_segment() Ming Lei
2018-05-25 3:45 ` [RESEND PATCH V5 06/33] block: use bio_for_each_segment() to compute segments count Ming Lei
2018-05-25 3:45 ` [RESEND PATCH V5 07/33] block: use bio_for_each_segment() to map sg Ming Lei
2018-05-25 3:45 ` [RESEND PATCH V5 08/33] block: introduce segment_last_page() Ming Lei
2018-05-25 3:45 ` [RESEND PATCH V5 09/33] fs/buffer.c: use bvec iterator to truncate the bio Ming Lei
2018-05-25 3:45 ` [RESEND PATCH V5 10/33] btrfs: use segment_last_page to get bio's last page Ming Lei
2018-05-25 3:45 ` [RESEND PATCH V5 11/33] block: implement bio_pages_all() via bio_for_each_page_all() Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 12/33] block: introduce bio_segments() Ming Lei
2018-05-25 4:42 ` Kent Overstreet [this message]
2018-05-25 3:46 ` [RESEND PATCH V5 13/33] block: introduce rq_for_each_segment() Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 14/33] block: loop: pass segments to iov_iter Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 15/33] block: introduce bio_clone_seg_bioset() Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 16/33] dm: clone bio via bio_clone_seg_bioset Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 17/33] block: bio: introduce bio_for_each_page_all2 and bio_for_each_segment_all Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 18/33] block: deal with dirtying pages for multipage bvec Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 19/33] block: convert to bio_for_each_page_all2() Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 20/33] md/dm/bcache: conver to bio_for_each_page_all2 and bio_for_each_segment Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 21/33] fs: conver to bio_for_each_page_all2 Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 22/33] btrfs: " Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 23/33] ext4: " Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 24/33] f2fs: " Ming Lei
2018-05-28 7:29 ` Chao Yu
2018-05-25 3:46 ` [RESEND PATCH V5 25/33] xfs: " Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 26/33] exofs: " Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 27/33] gfs2: " Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 28/33] block: kill bio_for_each_page_all() Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 29/33] block: rename bio_for_each_page_all2 as bio_for_each_page_all Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 30/33] block: enable multipage bvecs Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 31/33] block: bio: pass segments to bio if bio_add_page() is bypassed Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 32/33] block: always define BIO_MAX_PAGES as 256 Ming Lei
2018-05-25 3:46 ` [RESEND PATCH V5 33/33] block: document usage of bio iterator helpers Ming Lei
2018-05-25 16:16 ` Randy Dunlap
2018-05-25 4:53 ` [RESEND PATCH V5 00/33] block: support multipage bvec Kent Overstreet
2018-05-25 16:30 ` Jens Axboe
2018-05-27 7:23 ` Ming Lei
2018-05-28 1:44 ` Jens Axboe
2018-05-28 2:30 ` Ming Lei
2018-06-01 8:43 ` Christoph Hellwig
2018-06-01 23:55 ` Ming Lei
2018-06-01 8:35 ` Christoph Hellwig
2018-06-02 3:29 ` Ming Lei
2018-06-01 14:09 ` David Sterba
2018-06-08 12:50 ` Ming Lei
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