f2fs: add a new function get_ssr_cost

This patch add a new method get_ssr_cost to select
SSR segment more accurately.

Signed-off-by: Yunlei He <heyunlei@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 93ba82c..3c901bc 100644 (file)
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -258,11 +258,20 @@ static unsigned int get_greedy_cost(struct f2fs_sb_info *sbi,
                                valid_blocks * 2 : valid_blocks;
 }
 
+static unsigned int get_ssr_cost(struct f2fs_sb_info *sbi,
+                                               unsigned int segno)
+{
+       struct seg_entry *se = get_seg_entry(sbi, segno);
+
+       return se->ckpt_valid_blocks > se->valid_blocks ?
+                               se->ckpt_valid_blocks : se->valid_blocks;
+}
+
 static inline unsigned int get_gc_cost(struct f2fs_sb_info *sbi,
                        unsigned int segno, struct victim_sel_policy *p)
 {
        if (p->alloc_mode == SSR)
-               return get_seg_entry(sbi, segno)->ckpt_valid_blocks;
+               return get_ssr_cost(sbi, segno);
 
        /* alloc_mode == LFS */
        if (p->gc_mode == GC_GREEDY)