linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: remove false-positive bug

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Message-ID: <0655d27f-a0e0-71d7-5890-13eb4325dfc8@huawei.com>
Date:   Thu, 1 Jun 2017 10:56:33 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [PATCH] f2fs: remove false-positive bug_on

On 2017/6/1 10:12, Jaegeuk Kim wrote:
> On 05/31, Chao Yu wrote:
>> Hi Jaegeuk,
>>
>> On 2017/5/27 7:59, Jaegeuk Kim wrote:
>>> If we got failure from both of create and evict_inode, we can hit this wrong
>>> bug_on.
>>>
>>> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
>>> ---
>>>  fs/f2fs/inode.c | 2 --
>>>  1 file changed, 2 deletions(-)
>>>
>>> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
>>> index e53c784ab11e..5673b0bd83b5 100644
>>> --- a/fs/f2fs/inode.c
>>> +++ b/fs/f2fs/inode.c
>>> @@ -426,8 +426,6 @@ void f2fs_evict_inode(struct inode *inode)
>>>  		alloc_nid_failed(sbi, inode->i_ino);
>>>  		clear_inode_flag(inode, FI_FREE_NID);
>>>  	}
>>> -	f2fs_bug_on(sbi, err &&
>>> -		!exist_written_data(sbi, inode->i_ino, ORPHAN_INO));
>>
>> We expect that we can keep the inode in orphan list in
>> handle_failed_inode path when inode page have been persisted, so that if
>> there is anything error in evice_inode, we can have another chance to
>> release inode resource during next mount.
>>
>> Here we need to check this case, additionally, if we failed to add the
>> inode into orphan list in handle_failed_inode, we must have set
>> SBI_NEED_FSCK in cp pack, so we need check the case too.
>>
>> So we can change the code to:
>>
>> f2fs_bug_on(err && err != -ENOENT &&
>> 		(!exist_written_data(sbi, inode->i_ino, ORPHAN_INO) ||
>> 		!is_sbi_flag_set(sbi, SBI_NEED_FSCK));

Oh, looks like it needs to use '&&' in between exist_written_data and
is_sbi_flag_set. Could you fix this?

Thanks,

> 
> Yup, I'll try this. ;)
> 
> Thanks,
> 
>>
>> How do you think?
>>
>> Thanks,
>>
>>>  out_clear:
>>>  	fscrypt_put_encryption_info(inode, NULL);
>>>  	clear_inode(inode);
>>>
> 
> .
>