linux-kernel - [PATCH] f2fs-tools: calculate cp

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Date:   Thu, 2 Mar 2017 11:39:09 +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-tools: calculate cp_ver correctly

It needs to check CP_CRC_RECOVERY_FLAG during cp_ver calculation.

Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
 include/f2fs_fs.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h
index 057adf39f6a9..a92011b83ff5 100644
--- a/include/f2fs_fs.h
+++ b/include/f2fs_fs.h
@@ -1089,10 +1089,13 @@ static inline __le64 get_cp_crc(struct f2fs_checkpoint *cp)
 {
 	u_int64_t cp_ver = get_cp(checkpoint_ver);
 	size_t crc_offset = get_cp(checksum_offset);
+	unsigned int ckpt_flags = le32_to_cpu(cp->ckpt_flags);
+
 	u_int32_t crc = le32_to_cpu(*(__le32 *)((unsigned char *)cp +
 							crc_offset));
 
-	cp_ver |= ((u_int64_t)crc << 32);
+	if (ckpt_flags & CP_CRC_RECOVERY_FLAG)
+		cp_ver |= ((u_int64_t)crc << 32);
 	return cpu_to_le64(cp_ver);
 }
 
-- 
2.8.2.295.g3f1c1d0