From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Tue, 23 Jun 2015 01:22:38 +0000 (-0700)
Subject: f2fs: set cached_en after checking finally
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=244f4fc1c530c4e486f0e4f0909c0514e4539ba2;p=deliverable%2Flinux.git

f2fs: set cached_en after checking finally

This patch relocates cached_en not only to be covered by spin_lock, but also
to set once after checking out completely.

Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 176e4ad4e5ed..982a1a58efd7 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -453,14 +453,12 @@ static struct extent_node *__lookup_extent_tree(struct extent_tree *et,
 	while (node) {
 		en = rb_entry(node, struct extent_node, rb_node);
 
-		if (fofs < en->ei.fofs) {
+		if (fofs < en->ei.fofs)
 			node = node->rb_left;
-		} else if (fofs >= en->ei.fofs + en->ei.len) {
+		else if (fofs >= en->ei.fofs + en->ei.len)
 			node = node->rb_right;
-		} else {
-			et->cached_en = en;
+		else
 			return en;
-		}
 	}
 	return NULL;
 }
@@ -625,6 +623,7 @@ static bool f2fs_lookup_extent_tree(struct inode *inode, pgoff_t pgofs,
 		spin_lock(&sbi->extent_lock);
 		if (!list_empty(&en->list))
 			list_move_tail(&en->list, &sbi->extent_list);
+		et->cached_en = en;
 		spin_unlock(&sbi->extent_lock);
 		stat_inc_read_hit(sbi->sb);
 	}