From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Ming Lei To: Jens Axboe , Christoph Hellwig , Kent Overstreet Cc: David Sterba , Huang Ying , Mike Snitzer , linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Theodore Ts'o , "Darrick J . Wong" , Coly Li , Filipe Manana , Randy Dunlap , Ming Lei Subject: [PATCH V7 18/24] block: introduce bio_bvecs() Date: Wed, 27 Jun 2018 20:45:42 +0800 Message-Id: <20180627124548.3456-19-ming.lei@redhat.com> In-Reply-To: <20180627124548.3456-1-ming.lei@redhat.com> References: <20180627124548.3456-1-ming.lei@redhat.com> Sender: owner-linux-mm@kvack.org List-ID: There are still cases in which we need to use bio_bvecs() for get the number of multipage segment, so introduce it. Signed-off-by: Ming Lei --- include/linux/bio.h | 30 +++++++++++++++++++++++++----- 1 file changed, 25 insertions(+), 5 deletions(-) diff --git a/include/linux/bio.h b/include/linux/bio.h index 551444bd9795..083c1ee9c6c8 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -242,7 +242,6 @@ static inline unsigned bio_segments(struct bio *bio) * We special case discard/write same/write zeroes, because they * interpret bi_size differently: */ - switch (bio_op(bio)) { case REQ_OP_DISCARD: case REQ_OP_SECURE_ERASE: @@ -251,13 +250,34 @@ static inline unsigned bio_segments(struct bio *bio) case REQ_OP_WRITE_SAME: return 1; default: - break; + bio_for_each_segment(bv, bio, iter) + segs++; + return segs; } +} - bio_for_each_segment(bv, bio, iter) - segs++; +static inline unsigned bio_bvecs(struct bio *bio) +{ + unsigned bvecs = 0; + struct bio_vec bv; + struct bvec_iter iter; - return segs; + /* + * We special case discard/write same/write zeroes, because they + * interpret bi_size differently: + */ + switch (bio_op(bio)) { + case REQ_OP_DISCARD: + case REQ_OP_SECURE_ERASE: + case REQ_OP_WRITE_ZEROES: + return 0; + case REQ_OP_WRITE_SAME: + return 1; + default: + bio_for_each_bvec(bv, bio, iter) + bvecs++; + return bvecs; + } } /* -- 2.9.5