linux-kernel - [PATCH 1/3] f2fs: introduce __try_update_largest

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Message-id: <00cb01d0f1ef$8886fc90$9994f5b0$@samsung.com>
Date:	Fri, 18 Sep 2015 16:53:07 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	Jaegeuk Kim <jaegeuk@...nel.org>
Cc:	linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] f2fs: introduce __try_update_largest_extent

This patch adds a new helper __try_update_largest_extent for cleanup.

Signed-off-by: Chao Yu <chao2.yu@...sung.com>
---
 fs/f2fs/extent_cache.c | 14 +++++---------
 fs/f2fs/f2fs.h         |  7 +++++++
 2 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
index c9d1cfd..31d5b48 100644
--- a/fs/f2fs/extent_cache.c
+++ b/fs/f2fs/extent_cache.c
@@ -351,8 +351,7 @@ static struct extent_node *__try_merge_extent_node(struct f2fs_sb_info *sbi,
 	}
 
 	if (en) {
-		if (en->ei.len > et->largest.len)
-			et->largest = en->ei;
+		__try_update_largest_extent(&et->largest, &en->ei);
 		et->cached_en = en;
 	}
 	return en;
@@ -389,8 +388,7 @@ do_insert:
 	if (!en)
 		return NULL;
 
-	if (en->ei.len > et->largest.len)
-		et->largest = en->ei;
+	__try_update_largest_extent(&et->largest, &en->ei);
 	et->cached_en = en;
 	return en;
 }
@@ -476,12 +474,10 @@ static unsigned int f2fs_update_extent_tree_range(struct inode *inode,
 				: NULL;
 		}
 
-		if (parts) {
-			if (en->ei.len > et->largest.len)
-				et->largest = en->ei;
-		} else {
+		if (parts)
+			__try_update_largest_extent(&et->largest, &en->ei);
+		else
 			__detach_extent_node(sbi, et, en);
-		}
 
 		/*
 		 * if original extent is split into zero or two parts, extent
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index dbceb35..3342619 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -498,6 +498,13 @@ static inline bool __is_front_mergeable(struct extent_info *cur,
 	return __is_extent_mergeable(cur, front);
 }
 
+static inline void __try_update_largest_extent(struct extent_info *largest,
+						struct extent_info *cur)
+{
+	if (cur->len > largest->len)
+		*largest = *cur;
+}
+
 struct f2fs_nm_info {
 	block_t nat_blkaddr;		/* base disk address of NAT */
 	nid_t max_nid;			/* maximum possible node ids */
-- 
2.5.2


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