f2fs: fix to search whole dirty segmap when get_victim

In ->get_victim we get max_search value from dirty_i->nr_dirty without
protection of seglist_lock, after that, nr_dirty can be increased/decreased
before we hold seglist_lock lock.
Then in main loop we attempt to traverse all dirty section one time to find
victim section, but it's not accurate to use max_search as the total loop count,
because we might lose checking several sections or check sections redundantly
for the case of nr_dirty are increased or decreased previously.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index dca7818c0662..7bf8392d555f 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -263,14 +263,14 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
         unsigned int secno, max_cost;
         int nsearched = 0;
 
+        mutex_lock(&dirty_i->seglist_lock);
+
         p.alloc_mode = alloc_mode;
         select_policy(sbi, gc_type, type, &p);
 
         p.min_segno = NULL_SEGNO;
         p.min_cost = max_cost = get_max_cost(sbi, &p);
 
-        mutex_lock(&dirty_i->seglist_lock);
-
         if (p.alloc_mode == LFS && gc_type == FG_GC) {
                 p.min_segno = check_bg_victims(sbi);
                 if (p.min_segno != NULL_SEGNO)