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

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Message-Id: <20160608172444.60371-4-jaegeuk@kernel.org>
Date:	Wed,  8 Jun 2016 10:24:41 -0700
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Cc:	Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 4/7] 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@...nel.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