From: Chao Yu <yuchao0@huawei.com>
To: <jaegeuk@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net
Subject: [f2fs-dev] [PATCH] f2fs: fix to force keeping write barrier for strict fsync mode
Date: Mon, 20 Jan 2020 18:00:45 +0800 [thread overview]
Message-ID: <20200120100045.70210-1-yuchao0@huawei.com> (raw)
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@huawei.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
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next reply other threads:[~2020-01-20 10:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-20 10:00 Chao Yu [this message]
2020-01-23 22:18 ` [f2fs-dev] [PATCH] f2fs: fix to force keeping write barrier for strict fsync mode Jaegeuk Kim
2020-02-05 1:39 ` Chao Yu
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