From: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Date: Mon, 20 May 2013 00:42:28 +0000 (+0900)
Subject: f2fs: skip get_node_page if locked node page is passed
X-Git-Tag: accepted/tizen/common/20141203.182822~1999^2~49
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1646cfac952ff87fcbc18a77164472aa61d08094;p=platform%2Fkernel%2Flinux-arm64.git

f2fs: skip get_node_page if locked node page is passed

If get_dnode_of_data gets a locked node page, let's skip redundant
get_node_page calls.
This is for the futher enhancement.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
---

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 9641534..f63f0a4 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -408,10 +408,13 @@ int get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode)
 	level = get_node_path(index, offset, noffset);
 
 	nids[0] = dn->inode->i_ino;
-	npage[0] = get_node_page(sbi, nids[0]);
-	if (IS_ERR(npage[0]))
-		return PTR_ERR(npage[0]);
+	npage[0] = dn->inode_page;
 
+	if (!npage[0]) {
+		npage[0] = get_node_page(sbi, nids[0]);
+		if (IS_ERR(npage[0]))
+			return PTR_ERR(npage[0]);
+	}
 	parent = npage[0];
 	if (level != 0)
 		nids[1] = get_nid(parent, offset[0], true);