linux-kernel - [PATCH 1/1] f2fs: check total_segments from devices in raw

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Date:   Mon, 23 Sep 2019 12:22:35 +0800
From:   sunqiuyang <sunqiuyang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>, <jaegeuk@...nel.org>,
        <yuchao0@...wei.com>
CC:     <sunqiuyang@...wei.com>
Subject: [PATCH 1/1] f2fs: check total_segments from devices in raw_super

From: Qiuyang Sun <sunqiuyang@...wei.com>

For multi-device F2FS, we should check if the sum of total_segments from
all devices matches segment_count.

Signed-off-by: Qiuyang Sun <sunqiuyang@...wei.com>
---
 fs/f2fs/super.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 04788a6..9a09d59 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2602,6 +2602,21 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
 		return -EFSCORRUPTED;
 	}
 
+	if (RDEV(0).path[0]) {
+		block_t dev_seg_count = le32_to_cpu(RDEV(0).total_segments);
+		int i = 1;
+
+		while (i < MAX_DEVICES && RDEV(i).path[0]) {
+			dev_seg_count += le32_to_cpu(RDEV(i).total_segments);
+			i++;
+		}
+		if (segment_count != dev_seg_count) {
+			f2fs_info(sbi, "Segment count (%u) mismatch with total segments from devices (%u)",
+					segment_count, dev_seg_count);
+			return -EFSCORRUPTED;
+		}
+	}
+
 	if (secs_per_zone > total_sections || !secs_per_zone) {
 		f2fs_info(sbi, "Wrong secs_per_zone / total_sections (%u, %u)",
 			  secs_per_zone, total_sections);
-- 
1.8.3.1