linux-kernel - [PATCH 5.11 739/775] f2fs: flush data when enabling checkpoint back

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Message-Id: <20210301161237.854569905@linuxfoundation.org>
Date:   Mon,  1 Mar 2021 17:15:07 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chao Yu <yuchao0@...wei.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 5.11 739/775] f2fs: flush data when enabling checkpoint back

From: Jaegeuk Kim <jaegeuk@...nel.org>

commit b0ff4fe746fd028eef920ddc8c7b0361c1ede6ec upstream.

During checkpoint=disable period, f2fs bypasses all the synchronous IOs such as
sync and fsync. So, when enabling it back, we must flush all of them in order
to keep the data persistent. Otherwise, suddern power-cut right after enabling
checkpoint will cause data loss.

Fixes: 4354994f097d ("f2fs: checkpoint disabling")
Cc: stable@...r.kernel.org
Reviewed-by: Chao Yu <yuchao0@...wei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/f2fs/super.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1796,6 +1796,9 @@ restore_flag:
 
 static void f2fs_enable_checkpoint(struct f2fs_sb_info *sbi)
 {
+	/* we should flush all the data to keep data consistency */
+	sync_inodes_sb(sbi->sb);
+
 	down_write(&sbi->gc_lock);
 	f2fs_dirty_to_prefree(sbi);