linux-kernel - [PATCH] f2fs: avoid unnecessary checkpoints

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Date:	Tue, 08 Oct 2013 09:33:15 +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: avoid unnecessary checkpoints

During the f2fs_put_super procedure, we don't need to conduct checkpoint all
the time, since we don't need to do that if superblock is clean.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@...sung.com>
---
 fs/f2fs/super.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index fde8e6a..539c009 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -372,7 +372,9 @@ static void f2fs_put_super(struct super_block *sb)
 	f2fs_destroy_stats(sbi);
 	stop_gc_thread(sbi);
 
-	write_checkpoint(sbi, true);
+	/* We don't need to do checkpoint when it's clean */
+	if (sbi->s_dirty && get_pages(sbi, F2FS_DIRTY_NODES))
+		write_checkpoint(sbi, true);
 
 	iput(sbi->node_inode);
 	iput(sbi->meta_inode);
-- 
1.8.4.474.g128a96c

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