linux-kernel - [PATCH 1/3] block: Add REQ_NOMERGE into REQ_COMMON

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Date:	Wed, 30 Oct 2013 10:41:39 +0800
From:	majianpeng <majianpeng@...il.com>
To:	axboe <axboe@...nel.dk>, NeilBrown <neilb@...e.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-raid <linux-raid@...r.kernel.org>
Subject: [PATCH 1/3] block: Add REQ_NOMERGE into REQ_COMMON_MASK

For bio with REQ_NOMERGE,it mean this bio can't merge with other bios.
And the request with this bio has the same meaning.
In blk_queue_bio, bio with REQ_NOMERGE can't be merged and get a new
request. But in init_request_from_bio, request can't test REQ_NOMERGE.
So the request can merge other bio or merge other request.
Add REQ_NOMERGE into REQ_COMMON_MASK to avoid this.

Signed-off-by: Jianpeng Ma <majianpeng@...il.com>
---
 include/linux/blk_types.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index fa1abeb..fc7f4c5 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -197,7 +197,7 @@ enum rq_flag_bits {
 #define REQ_COMMON_MASK \
 	(REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \
 	 REQ_DISCARD | REQ_WRITE_SAME | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | \
-	 REQ_SECURE)
+	 REQ_SECURE | REQ_NOMERGE)
 #define REQ_CLONE_MASK		REQ_COMMON_MASK
 
 #define BIO_NO_ADVANCE_ITER_MASK	(REQ_DISCARD|REQ_WRITE_SAME)
-- 
1.8.4