linux-kernel - [PATCH] f2fs: fix to clear PG_checked flag in set_page

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Date:   Sun, 29 Jul 2018 12:16:59 +0800
From:   Chao Yu <chao@...nel.org>
To:     jaegeuk@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, Chao Yu <yuchao0@...wei.com>,
        Weichao Guo <guoweichao@...wei.com>
Subject: [PATCH] f2fs: fix to clear PG_checked flag in set_page_dirty()

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

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>
---
 fs/f2fs/data.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index bac667831052..eb994c66fe66 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2549,6 +2549,10 @@ static int f2fs_set_data_page_dirty(struct page *page)
 	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);
-- 
2.18.0