linux-kernel - [PATCH V6 13/30] block: introduce rq_for_each

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Date:   Sat,  9 Jun 2018 20:29:57 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Jens Axboe <axboe@...com>, Christoph Hellwig <hch@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Kent Overstreet <kent.overstreet@...il.com>
Cc:     David Sterba <dsterba@...e.cz>, Huang Ying <ying.huang@...el.com>,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        Theodore Ts'o <tytso@....edu>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Coly Li <colyli@...e.de>, Filipe Manana <fdmanana@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Ming Lei <ming.lei@...hat.com>
Subject: [PATCH V6 13/30] block: introduce rq_for_each_chunk()

There are still cases in which rq_for_each_chunk() is required, for
example, loop.

Signed-off-by: Ming Lei <ming.lei@...hat.com>
---
 include/linux/blkdev.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index bca3a92eb55f..4eaba73c784a 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -941,6 +941,10 @@ struct req_iterator {
 	__rq_for_each_bio(_iter.bio, _rq)			\
 		bio_for_each_segment(bvl, _iter.bio, _iter.iter)
 
+#define rq_for_each_chunk(bvl, _rq, _iter)			\
+	__rq_for_each_bio(_iter.bio, _rq)			\
+		bio_for_each_chunk(bvl, _iter.bio, _iter.iter)
+
 #define rq_iter_last(bvec, _iter)				\
 		(_iter.bio->bi_next == NULL &&			\
 		 bio_iter_last(bvec, _iter.iter))
-- 
2.9.5