linux-kernel - Re: [PATCH v4] f2fs: check segment type in __f2fs_replace

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Date:   Thu, 4 Jan 2018 15:22:45 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>,
        Yunlong Song <yunlong.song@...wei.com>
CC:     <chao@...nel.org>, <yunlong.song@...oud.com>, <miaoxie@...wei.com>,
        <bintian.wang@...wei.com>, <shengyong1@...wei.com>,
        <heyunlei@...wei.com>, <linux-fsdevel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] f2fs: check segment type in __f2fs_replace_block

On 2018/1/4 15:10, Jaegeuk Kim wrote:
> On 01/04, Yunlong Song wrote:
>> In some case, the node blocks has wrong blkaddr whose segment type is
>> NODE, e.g., recover inode has missing xattr flag and the blkaddr is in
>> the xattr range. Since fsck.f2fs does not check the recovery nodes, this
>> will cause __f2fs_replace_block change the curseg of node and do the
>> update_sit_entry(sbi, new_blkaddr, 1) with no next_blkoff refresh, as a
>> result, when recovery process write checkpoint and sync nodes, the
>> next_blkoff of curseg is used in the segment bit map, then it will
>> cause f2fs_bug_on. So let's check segment type in __f2fs_replace_block.
>>
>> Signed-off-by: Yunlong Song <yunlong.song@...wei.com>
>> ---
>>  fs/f2fs/segment.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
>> index 890d483..50575d5 100644
>> --- a/fs/f2fs/segment.c
>> +++ b/fs/f2fs/segment.c
>> @@ -2720,6 +2720,7 @@ void __f2fs_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
>>  	type = se->type;
>>  
>>  	down_write(&SM_I(sbi)->curseg_lock);
>> +	f2fs_bug_on(sbi, se->valid_blocks && !IS_DATASEG(type));
> 
> Let me just move this below like this and start some tests.
> 
> ...
> 
> +       f2fs_bug_on(sbi, !IS_DATASEG(type));

Better,

Reviewed-by: Chao Yu <yuchao0@...wei.com>

Thanks,

>         curseg = CURSEG_I(sbi, type);
> 
>>  
>>  	if (!recover_curseg) {
>>  		/* for recovery flow */
>> -- 
>> 1.8.5.2
> 
> .
>