linux-kernel - Re: [PATCH 2/2 v2] f2fs: avoid to select pinned section during checkpoint=disable

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Message-ID: <YnLgnhiJtrutv8nw@google.com>
Date:   Wed, 4 May 2022 13:22:54 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH 2/2 v2] f2fs: avoid to select pinned section during
 checkpoint=disable

The f2fs_gc uses a bitmap to indicate pinned sections, but when disabling
chckpoint, we call f2fs_gc() with NULL_SEGNO which selects the same dirty
segment as a victim all the time, resulting in checkpoint=disable failure.
Let's pick another one, if we fail to collect it.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---

 Change log from v1:
  - keep sync condition to stop GC

 fs/f2fs/gc.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 4d47723523c3..441190ab8593 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -1838,10 +1838,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
 	if (gc_type == FG_GC)
 		sbi->cur_victim_sec = NULL_SEGNO;
 
-	if (sync)
-		goto stop;
-
-	if (!has_not_enough_free_secs(sbi, sec_freed, 0))
+	if ((!has_not_enough_free_secs(sbi, sec_freed, 0) || sync) && seg_freed)
 		goto stop;
 
 	if (skipped_round <= MAX_SKIP_GC_COUNT || skipped_round * 2 < round) {
-- 
2.36.0.464.gb9c8b46e94-goog