linux-kernel - [PATCH 4/5] f2fs: write node pages if checkpoint is not doing

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Date:	Sat,  8 Nov 2014 23:36:08 -0800
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Cc:	Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 4/5] f2fs: write node pages if checkpoint is not doing

It needs to write node pages if checkpoint is not doing in order to avoid
memory pressure.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/node.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 4ea2c47..6f514fb 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1314,10 +1314,12 @@ static int f2fs_write_node_page(struct page *page,
 		return 0;
 	}
 
-	if (wbc->for_reclaim)
-		goto redirty_out;
-
-	down_read(&sbi->node_write);
+	if (wbc->for_reclaim) {
+		if (!down_read_trylock(&sbi->node_write))
+			goto redirty_out;
+	} else {
+		down_read(&sbi->node_write);
+	}
 	set_page_writeback(page);
 	write_node_page(sbi, page, &fio, nid, ni.blk_addr, &new_addr);
 	set_node_addr(sbi, &ni, new_addr, is_fsync_dnode(page));
-- 
2.1.1

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