f2fs: node segment is prior to data segment selected victim

As data segment gc may lead dnode dirty, so the greedy cost for data segment
should be valid blocks * 2, that is data segment is prior to node segment.

Signed-off-by: Hou Pengyang <houpengyang@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index e93aecb..11416c7 100644 (file)
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -242,6 +242,16 @@ static unsigned int get_cb_cost(struct f2fs_sb_info *sbi, unsigned int segno)
        return UINT_MAX - ((100 * (100 - u) * age) / (100 + u));
 }
 
+static unsigned int get_greedy_cost(struct f2fs_sb_info *sbi,
+                                               unsigned int segno)
+{
+       unsigned int valid_blocks =
+                       get_valid_blocks(sbi, segno, sbi->segs_per_sec);
+
+       return IS_DATASEG(get_seg_entry(sbi, segno)->type) ?
+                               valid_blocks * 2 : valid_blocks;
+}
+
 static inline unsigned int get_gc_cost(struct f2fs_sb_info *sbi,
                        unsigned int segno, struct victim_sel_policy *p)
 {
@@ -250,7 +260,7 @@ static inline unsigned int get_gc_cost(struct f2fs_sb_info *sbi,
 
        /* alloc_mode == LFS */
        if (p->gc_mode == GC_GREEDY)
-               return get_valid_blocks(sbi, segno, sbi->segs_per_sec);
+               return get_greedy_cost(sbi, segno);
        else
                return get_cb_cost(sbi, segno);
 }