linux-kernel - [PATCH 2/4] block: check virt boundary in bio_will

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Message-Id: <1455519687-23873-3-git-send-email-ming.lei@canonical.com>
Date:	Mon, 15 Feb 2016 15:01:25 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org
Cc:	linux-block@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
	Sagi Grimberg <sagig@....mellanox.co.il>,
	Ming Lei <ming.lei@...onical.com>
Subject: [PATCH 2/4] block: check virt boundary in bio_will_gap()

In the following patch, the way for figuring out
the last bvec will be changed with a bit cost introduced,
so return immediately if the queue doesn't have virt
boundary limit. Actually most of devices have not
this limit.

Cc: Sagi Grimberg <sagig@....mellanox.co.il>
Cc: Christoph Hellwig <hch@...radead.org>
Signed-off-by: Ming Lei <ming.lei@...onical.com>
---
 include/linux/blkdev.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 4571ef1..b8ff6a3 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1388,7 +1388,7 @@ static inline bool bvec_gap_to_prev(struct request_queue *q,
 static inline bool bio_will_gap(struct request_queue *q, struct bio *prev,
 			 struct bio *next)
 {
-	if (!bio_has_data(prev))
+	if (!bio_has_data(prev) || !queue_virt_boundary(q))
 		return false;
 
 	return bvec_gap_to_prev(q, &prev->bi_io_vec[prev->bi_vcnt - 1],
-- 
1.9.1