linux-kernel - [PATCH] f2fs: fix to force keeping write barrier for strict fsync mode

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Date:   Mon, 20 Jan 2020 18:00:45 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     <jaegeuk@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <chao@...nel.org>,
        Chao Yu <yuchao0@...wei.com>
Subject: [PATCH] f2fs: fix to force keeping write barrier for strict fsync mode

If barrier is enabled, for strict fsync mode, we should force to
use atomic write semantics to avoid data corruption due to no
barrier support in lower device.

Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
 fs/f2fs/file.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 86ddbb55d2b1..c9dd45f82fbd 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -241,6 +241,13 @@ static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
 	};
 	unsigned int seq_id = 0;
 
+	/*
+	 * for strict fsync mode, force to keep atomic write sematics to avoid
+	 * data corruption if lower device doesn't support write barrier.
+	 */
+	if (!atomic && F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
+		atomic = true;
+
 	if (unlikely(f2fs_readonly(inode->i_sb) ||
 				is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
 		return 0;
-- 
2.18.0.rc1