[PATCH 4/7] f2fs: skip clean segment for gc

[Jaegeuk Kim]

If a segment in a section is clean or prefreed, we don't need to get its summary
and do gc.

Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
---
 fs/f2fs/gc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 67fd285..e1d274c 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -795,6 +795,10 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi,
        }
 
        for (segno = start_segno; segno < end_segno; segno++) {
+
+               if (get_valid_blocks(sbi, segno, 1) == 0)
+                       continue;
+
                /* find segment summary of victim */
                sum_page = find_get_page(META_MAPPING(sbi),
                                        GET_SUM_BLOCK(sbi, segno));
-- 
2.8.3