linux-kernel - [PATCH] f2fs: merge read IOs at ra_nat

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Date:	Thu, 21 Nov 2013 18:35:50 +0900
From:	Jaegeuk Kim <jaegeuk.kim@...sung.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	Jaegeuk Kim <jaegeuk.kim@...sung.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Subject: [PATCH] f2fs: merge read IOs at ra_nat_pages()

This patch changes the policy of submitting read bios at ra_nat_pages.

Previously, f2fs submits small read bios with block plugging.
But, with this patch, f2fs itself merges read bios first and then submits a
large bio, which can reduce the bio handling overheads.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@...sung.com>
---
 fs/f2fs/node.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index b843a5b..c06871f 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -89,13 +89,10 @@ static void ra_nat_pages(struct f2fs_sb_info *sbi, int nid)
 {
 	struct address_space *mapping = sbi->meta_inode->i_mapping;
 	struct f2fs_nm_info *nm_i = NM_I(sbi);
-	struct blk_plug plug;
 	struct page *page;
 	pgoff_t index;
 	int i;
 
-	blk_start_plug(&plug);
-
 	for (i = 0; i < FREE_NID_PAGES; i++, nid += NAT_ENTRY_PER_BLOCK) {
 		if (nid >= nm_i->max_nid)
 			nid = 0;
@@ -108,12 +105,11 @@ static void ra_nat_pages(struct f2fs_sb_info *sbi, int nid)
 			f2fs_put_page(page, 1);
 			continue;
 		}
-		if (f2fs_readpage(sbi, page, index, READ))
-			continue;
+		submit_read_page(sbi, page, index, READ_SYNC);
 
 		f2fs_put_page(page, 0);
 	}
-	blk_finish_plug(&plug);
+	f2fs_submit_read_bio(sbi, READ_SYNC);
 }
 
 static struct nat_entry *__lookup_nat_cache(struct f2fs_nm_info *nm_i, nid_t n)
-- 
1.8.4.474.g128a96c

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