linux-kernel - [PATCH] f2fs: correct cp_ver for compatibility to old image

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Date:   Thu, 2 Mar 2017 11:22:33 +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: correct cp_ver for compatibility to old image

There is no CP_CRC_RECOVERY_FLAG tagged in checkpoint pack, calculate
cp_version as old format.

Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
 fs/f2fs/node.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 6c027b6833f4..0d46404ca769 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -2507,7 +2507,9 @@ static int __get_nat_bitmaps(struct f2fs_sb_info *sbi)
 		f2fs_put_page(page, 1);
 	}
 
-	cp_ver |= (cur_cp_crc(ckpt) << 32);
+	if (__is_set_ckpt_flags(ckpt, CP_CRC_RECOVERY_FLAG))
+		cp_ver |= (cur_cp_crc(ckpt) << 32);
+
 	if (cpu_to_le64(cp_ver) != *(__le64 *)nm_i->nat_bits) {
 		disable_nat_bits(sbi, true);
 		return 0;
-- 
2.8.2.295.g3f1c1d0