linux-kernel - [PATCH 2/2] f2fs: add REQ_META about metadata requests for submit bio

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Date:	Sat, 20 Apr 2013 01:27:40 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	jaegeuk.kim@...sung.com
Cc:	linux-f2fs-devel@...ts.sourceforge.net,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Namjae Jeon <linkinjeon@...il.com>,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: [PATCH 2/2] f2fs: add REQ_META about metadata requests for submit bio

From: Namjae Jeon <namjae.jeon@...sung.com>

Adding REQ_META for all the metadata requests can help in improving the
FS performance, if the underlying device supports TAGGING.
So, when considering the submit_bio path for all the f2fs requests. We can
add REQ_META for all the META requests.
As a precursor to this change we considered the commit
4265900e0be653f5b78baf2816857ef57cf1332f 'mmc: MMC-4.5 Data Tag Support'

Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@...sung.com>
---
 fs/f2fs/segment.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 1193a26..a2e5de7 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -689,6 +689,9 @@ static void do_submit_bio(struct f2fs_sb_info *sbi,
 	if (type >= META_FLUSH)
 		rw = WRITE_FLUSH_FUA;
 
+	if (type == META)
+		rw |= REQ_META;
+
 	if (sbi->bio[btype]) {
 		struct bio_private *p = sbi->bio[btype]->bi_private;
 		trace_f2fs_do_submit_bio(sbi->sb, btype, sync,
-- 
1.7.9.5

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