From: Chao Yu <chao2.yu@samsung.com>
Date: Mon, 5 Oct 2015 14:20:40 +0000 (+0800)
Subject: f2fs: skip searching dirty map if dirty segment is not exist
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=3342bb303bf48dd8bb5ac94c3356489ff53e4d04;p=deliverable%2Flinux.git

f2fs: skip searching dirty map if dirty segment is not exist

When searching victim during gc, if there are no dirty segments in
filesystem, we will still take the time to search the whole dirty segment
map, it's not needed, it's better to skip in this condition.

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

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index e5c255ba227b..d844a8028527 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -268,6 +268,9 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
 	p.min_segno = NULL_SEGNO;
 	p.min_cost = max_cost = get_max_cost(sbi, &p);
 
+	if (p.max_search == 0)
+		goto out;
+
 	if (p.alloc_mode == LFS && gc_type == FG_GC) {
 		p.min_segno = check_bg_victims(sbi);
 		if (p.min_segno != NULL_SEGNO)
@@ -329,6 +332,7 @@ got_it:
 				sbi->cur_victim_sec,
 				prefree_segments(sbi), free_segments(sbi));
 	}
+out:
 	mutex_unlock(&dirty_i->seglist_lock);
 
 	return (p.min_segno == NULL_SEGNO) ? 0 : 1;