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Date:   Fri, 15 May 2020 07:45:09 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com
Subject: Re: [f2fs-dev] [PATCH] f2fs: flush dirty meta pages when flushing
 them

On 05/15, Chao Yu wrote:
> On 2020/5/15 10:15, Jaegeuk Kim wrote:
> > Let's guarantee flusing dirty meta pages to avoid infinite loop.
> 
> What's the root cause? Race case or meta page flush failure?

Investigating, but at least, this can avoid the inifinite loop there.

V2:

>From c60ce8e7178004fd6cba96e592247e43b5fd98d8 Mon Sep 17 00:00:00 2001
From: Jaegeuk Kim <jaegeuk@...nel.org>
Date: Wed, 13 May 2020 21:12:53 -0700
Subject: [PATCH] f2fs: flush dirty meta pages when flushing them

Let's guarantee flusing dirty meta pages to avoid infinite loop.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/checkpoint.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 620a386d82c1a..3dc3ac6fe1432 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1266,6 +1266,9 @@ void f2fs_wait_on_all_pages(struct f2fs_sb_info *sbi, int type)
 		if (unlikely(f2fs_cp_error(sbi)))
 			break;
 
+		if (type == F2FS_DIRTY_META)
+			f2fs_sync_meta_pages(sbi, META, LONG_MAX,
+							FS_CP_META_IO);
 		io_schedule_timeout(DEFAULT_IO_TIMEOUT);
 	}
 	finish_wait(&sbi->cp_wait, &wait);
-- 
2.26.2.761.g0e0b3e54be-goog

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