f2fs: skip clean segment for gc

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 <jaegeuk@kernel.org>

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 67fd2855ccc92216f757a32dbfef57311fd91322..e1d274cdecb8d3c0780ca47a1d81525e3e459b4e 100644 (file)
--- 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));