linux-kernel - [PATCH 4.18 095/197] f2fs: fix to clear PG_checked flag in set_page

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Date:   Thu, 13 Sep 2018 15:30:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Weichao Guo <guoweichao@...wei.com>,
        Chao Yu <yuchao0@...wei.com>, Jaegeuk Kim <jaegeuk@...nel.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 095/197] f2fs: fix to clear PG_checked flag in set_page_dirty()

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chao Yu <yuchao0@...wei.com>

[ Upstream commit 66110abc4c931f879d70e83e1281f891699364bf ]

PG_checked flag will be set on data page during GC, later, we can
recognize such page by the flag and migrate page to cold segment.

But previously, we don't clear this flag when invalidating data page,
after page redirtying, we will write it into wrong log.

Let's clear PG_checked flag in set_page_dirty() to avoid this.

Signed-off-by: Weichao Guo <guoweichao@...wei.com>
Signed-off-by: Chao Yu <yuchao0@...wei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/f2fs/data.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2494,6 +2494,10 @@ static int f2fs_set_data_page_dirty(stru
 	if (!PageUptodate(page))
 		SetPageUptodate(page);
 
+	/* don't remain PG_checked flag which was set during GC */
+	if (is_cold_data(page))
+		clear_cold_data(page);
+
 	if (f2fs_is_atomic_file(inode) && !f2fs_is_commit_atomic_write(inode)) {
 		if (!IS_ATOMIC_WRITTEN_PAGE(page)) {
 			f2fs_register_inmem_page(inode, page);