linux-kernel - [PATCH] f2fs: fix the size value in __check_sit

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Date:   Fri, 4 Aug 2017 17:07:15 +0800
From:   Yunlong Song <yunlong.song@...wei.com>
To:     <jaegeuk@...nel.org>, <chao@...nel.org>, <yuchao0@...wei.com>,
        <yunlong.song@...oud.com>, <yunlong.song@...wei.com>
CC:     <miaoxie@...wei.com>, <bintian.wang@...wei.com>,
        <linux-fsdevel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] f2fs: fix the size value in __check_sit_bitmap

The current size value is not correct and will miss bitmap check.

Signed-off-by: Yunlong Song <yunlong.song@...wei.com>
---
 fs/f2fs/segment.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index f336f8c..45fb534 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -787,11 +787,14 @@ void __check_sit_bitmap(struct f2fs_sb_info *sbi,
 		sentry = get_seg_entry(sbi, segno);
 		offset = GET_BLKOFF_FROM_SEG0(sbi, blk);
 
-		size = min((unsigned long)(end - blk), max_blocks);
+		if (end < START_BLOCK(sbi, segno + 1))
+			size = GET_BLKOFF_FROM_SEG0(sbi, end);
+		else
+			size = max_blocks;
 		map = (unsigned long *)(sentry->cur_valid_map);
 		offset = __find_rev_next_bit(map, size, offset);
 		f2fs_bug_on(sbi, offset != size);
-		blk += size;
+		blk = START_BLOCK(sbi, segno + 1);
 	}
 #endif
 }
-- 
1.8.5.2