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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Xianrong Zhou <zhouxianrong@huawei.com>,
        Chao Yu <yuchao0@huawei.com>, Jaegeuk Kim <jaegeuk@kernel.org>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.14 043/126] f2fs: fix to active page in lru list for read path
Date:   Tue, 18 Sep 2018 00:41:31 +0200
Message-Id: <20180917211707.497047943@linuxfoundation.org>
In-Reply-To: <20180917211703.481236999@linuxfoundation.org>
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4.14-stable review patch.  If anyone has any objections, please let me know.

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

From: Chao Yu <yuchao0@huawei.com>

[ Upstream commit 82cf4f132e6d16dca6fc3bd955019246141bc645 ]

If config CONFIG_F2FS_FAULT_INJECTION is on, for both read or write path
we will call find_lock_page() to get the page, but for read path, it
missed to passing FGP_ACCESSED to allocator to active the page in LRU
list, result in being reclaimed in advance incorrectly, fix it.

Reported-by: Xianrong Zhou <zhouxianrong@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/f2fs/f2fs.h |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1766,8 +1766,13 @@ static inline struct page *f2fs_grab_cac
 						pgoff_t index, bool for_write)
 {
 #ifdef CONFIG_F2FS_FAULT_INJECTION
-	struct page *page = find_lock_page(mapping, index);
+	struct page *page;
 
+	if (!for_write)
+		page = find_get_page_flags(mapping, index,
+						FGP_LOCK | FGP_ACCESSED);
+	else
+		page = find_lock_page(mapping, index);
 	if (page)
 		return page;